diff --git a/fs/Kconfig b/fs/Kconfig
index b8fcb416be72983e77a11d033f044d14685f8e07..4524916fa200b1b4e9c8349ff94c78711595be8d 100644
--- a/fs/Kconfig
+++ b/fs/Kconfig
@@ -10,6 +10,9 @@ config DCACHE_WORD_ACCESS
if BLOCK
+config FS_IOMAP
+ bool
+
source "fs/ext2/Kconfig"
source "fs/ext4/Kconfig"
source "fs/jbd2/Kconfig"
diff --git a/fs/Makefile b/fs/Makefile
index 85b6e13b62d363c36a727baa0452b278ae8a1d5e..ed2b63257ba99bc5b7ff18602b342fd5263cc9ee 100644
--- a/fs/Makefile
+++ b/fs/Makefile
@@ -49,6 +49,7 @@ obj-$(CONFIG_COREDUMP) += coredump.o
obj-$(CONFIG_SYSCTL) += drop_caches.o
obj-$(CONFIG_FHANDLE) += fhandle.o
+obj-$(CONFIG_FS_IOMAP) += iomap.o
obj-y += quota/
diff --git a/fs/buffer.c b/fs/buffer.c
index b9fa1be75e69a7b4be1502174859fe234944ddd2..9c8eb9b6db6aace3ef93edc5c8369ba48ecfb4f4 100644
--- a/fs/buffer.c
+++ b/fs/buffer.c
@@ -21,6 +21,7 @@
#include <linux/kernel.h>
#include <linux/syscalls.h>
#include <linux/fs.h>
+#include <linux/iomap.h>
#include <linux/mm.h>
#include <linux/percpu.h>
#include <linux/slab.h>
@@ -1892,8 +1893,62 @@ void page_zero_new_buffers(struct page *page, unsigned from, unsigned to)
}
EXPORT_SYMBOL(page_zero_new_buffers);
-int __block_write_begin(struct page *page, loff_t pos, unsigned len,
- get_block_t *get_block)
+static void
+iomap_to_bh(struct inode *inode, sector_t block, struct buffer_head *bh,
+ struct iomap *iomap)
+{
+ loff_t offset = block << inode->i_blkbits;
+
+ bh->b_bdev = iomap->bdev;
+
+ /*
+ * Block points to offset in file we need to map, iomap contains
+ * the offset at which the map starts. If the map ends before the
+ * current block, then do not map the buffer and let the caller
+ * handle it.
+ */
+ BUG_ON(offset >= iomap->offset + iomap->length);
+
+ switch (iomap->type) {
+ case IOMAP_HOLE:
+ /*
+ * If the buffer is not up to date or beyond the current EOF,
+ * we need to mark it as new to ensure sub-block zeroing is
+ * executed if necessary.
+ */
+ if (!buffer_uptodate(bh) ||
+ (offset >= i_size_read(inode)))
+ set_buffer_new(bh);
+ break;
+ case IOMAP_DELALLOC:
+ if (!buffer_uptodate(bh) ||
+ (offset >= i_size_read(inode)))
+ set_buffer_new(bh);
+ set_buffer_uptodate(bh);
+ set_buffer_mapped(bh);
+ set_buffer_delay(bh);
+ break;
+ case IOMAP_UNWRITTEN:
+ /*
+ * For unwritten regions, we always need to ensure that
+ * sub-block writes cause the regions in the block we are not
+ * writing to are zeroed. Set the buffer as new to ensure this.
+ */
+ set_buffer_new(bh);
+ set_buffer_unwritten(bh);
+ /* FALLTHRU */
+ case IOMAP_MAPPED:
+ if (offset >= i_size_read(inode))
+ set_buffer_new(bh);
+ bh->b_blocknr = (iomap->blkno >> (inode->i_blkbits - 9)) +
+ ((offset - iomap->offset) >> inode->i_blkbits);
+ set_buffer_mapped(bh);
+ break;
+ }
+}
+
+int __block_write_begin_int(struct page *page, loff_t pos, unsigned len,
+ get_block_t *get_block, struct iomap *iomap)
{
unsigned from = pos & (PAGE_SIZE - 1);
unsigned to = from + len;
@@ -1929,9 +1984,14 @@ int __block_write_begin(struct page *page, loff_t pos, unsigned len,
clear_buffer_new(bh);
if (!buffer_mapped(bh)) {
WARN_ON(bh->b_size != blocksize);
- err = get_block(inode, block, bh, 1);
- if (err)
- break;
+ if (get_block) {
+ err = get_block(inode, block, bh, 1);
+ if (err)
+ break;
+ } else {
+ iomap_to_bh(inode, block, bh, iomap);
+ }
+
if (buffer_new(bh)) {
unmap_underlying_metadata(bh->b_bdev,
bh->b_blocknr);
@@ -1972,6 +2032,12 @@ int __block_write_begin(struct page *page, loff_t pos, unsigned len,
page_zero_new_buffers(page, from, to);
return err;
}
+
+int __block_write_begin(struct page *page, loff_t pos, unsigned len,
+ get_block_t *get_block)
+{
+ return __block_write_begin_int(page, pos, len, get_block, NULL);
+}
EXPORT_SYMBOL(__block_write_begin);
static int __block_commit_write(struct inode *inode, struct page *page,
diff --git a/fs/internal.h b/fs/internal.h
index f57ced528cde71d498ecb6339188cf6d4cd216f9..cef0913e5d417418166986d09d0da11817af1edb 100644
--- a/fs/internal.h
+++ b/fs/internal.h
@@ -11,6 +11,7 @@
struct super_block;
struct file_system_type;
+struct iomap;
struct linux_binprm;
struct path;
struct mount;
@@ -39,6 +40,8 @@ static inline int __sync_blockdev(struct block_device *bdev, int wait)
* buffer.c
*/
extern void guard_bio_eod(int rw, struct bio *bio);
+extern int __block_write_begin_int(struct page *page, loff_t pos, unsigned len,
+ get_block_t *get_block, struct iomap *iomap);
/*
* char_dev.c
diff --git a/fs/iomap.c b/fs/iomap.c
new file mode 100644
index 0000000000000000000000000000000000000000..48141b8eff5f4f799f804674c83173863c156b2c
--- /dev/null
+++ b/fs/iomap.c
@@ -0,0 +1,497 @@
+/*
+ * Copyright (C) 2010 Red Hat, Inc.
+ * Copyright (c) 2016 Christoph Hellwig.
+ *
+ * This program is free software; you can redistribute it and/or modify it
+ * under the terms and conditions of the GNU General Public License,
+ * version 2, as published by the Free Software Foundation.
+ *
+ * This program is distributed in the hope it will be useful, but WITHOUT
+ * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
+ * FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
+ * more details.
+ */
+#include <linux/module.h>
+#include <linux/compiler.h>
+#include <linux/fs.h>
+#include <linux/iomap.h>
+#include <linux/uaccess.h>
+#include <linux/gfp.h>
+#include <linux/mm.h>
+#include <linux/swap.h>
+#include <linux/pagemap.h>
+#include <linux/file.h>
+#include <linux/uio.h>
+#include <linux/backing-dev.h>
+#include <linux/buffer_head.h>
+#include <linux/dax.h>
+#include "internal.h"
+
+typedef loff_t (*iomap_actor_t)(struct inode *inode, loff_t pos, loff_t len,
+ void *data, struct iomap *iomap);
+
+/*
+ * Execute a iomap write on a segment of the mapping that spans a
+ * contiguous range of pages that have identical block mapping state.
+ *
+ * This avoids the need to map pages individually, do individual allocations
+ * for each page and most importantly avoid the need for filesystem specific
+ * locking per page. Instead, all the operations are amortised over the entire
+ * range of pages. It is assumed that the filesystems will lock whatever
+ * resources they require in the iomap_begin call, and release them in the
+ * iomap_end call.
+ */
+static loff_t
+iomap_apply(struct inode *inode, loff_t pos, loff_t length, unsigned flags,
+ struct iomap_ops *ops, void *data, iomap_actor_t actor)
+{
+ struct iomap iomap = { 0 };
+ loff_t written = 0, ret;
+
+ /*
+ * Need to map a range from start position for length bytes. This can
+ * span multiple pages - it is only guaranteed to return a range of a
+ * single type of pages (e.g. all into a hole, all mapped or all
+ * unwritten). Failure at this point has nothing to undo.
+ *
+ * If allocation is required for this range, reserve the space now so
+ * that the allocation is guaranteed to succeed later on. Once we copy
+ * the data into the page cache pages, then we cannot fail otherwise we
+ * expose transient stale data. If the reserve fails, we can safely
+ * back out at this point as there is nothing to undo.
+ */
+ ret = ops->iomap_begin(inode, pos, length, flags, &iomap);
+ if (ret)
+ return ret;
+ if (WARN_ON(iomap.offset > pos))
+ return -EIO;
+
+ /*
+ * Cut down the length to the one actually provided by the filesystem,
+ * as it might not be able to give us the whole size that we requested.
+ */
+ if (iomap.offset + iomap.length < pos + length)
+ length = iomap.offset + iomap.length - pos;
+
+ /*
+ * Now that we have guaranteed that the space allocation will succeed.
+ * we can do the copy-in page by page without having to worry about
+ * failures exposing transient data.
+ */
+ written = actor(inode, pos, length, data, &iomap);
+
+ /*
+ * Now the data has been copied, commit the range we've copied. This
+ * should not fail unless the filesystem has had a fatal error.
+ */
+ ret = ops->iomap_end(inode, pos, length, written > 0 ? written : 0,
+ flags, &iomap);
+
+ return written ? written : ret;
+}
+
+static void
+iomap_write_failed(struct inode *inode, loff_t pos, unsigned len)
+{
+ loff_t i_size = i_size_read(inode);
+
+ /*
+ * Only truncate newly allocated pages beyoned EOF, even if the
+ * write started inside the existing inode size.
+ */
+ if (pos + len > i_size)
+ truncate_pagecache_range(inode, max(pos, i_size), pos + len);
+}
+
+static int
+iomap_write_begin(struct inode *inode, loff_t pos, unsigned len, unsigned flags,
+ struct page **pagep, struct iomap *iomap)
+{
+ pgoff_t index = pos >> PAGE_SHIFT;
+ struct page *page;
+ int status = 0;
+
+ BUG_ON(pos + len > iomap->offset + iomap->length);
+
+ page = grab_cache_page_write_begin(inode->i_mapping, index, flags);
+ if (!page)
+ return -ENOMEM;
+
+ status = __block_write_begin_int(page, pos, len, NULL, iomap);
+ if (unlikely(status)) {
+ unlock_page(page);
+ put_page(page);
+ page = NULL;
+
+ iomap_write_failed(inode, pos, len);
+ }
+
+ *pagep = page;
+ return status;
+}
+
+static int
+iomap_write_end(struct inode *inode, loff_t pos, unsigned len,
+ unsigned copied, struct page *page)
+{
+ int ret;
+
+ ret = generic_write_end(NULL, inode->i_mapping, pos, len,
+ copied, page, NULL);
+ if (ret < len)
+ iomap_write_failed(inode, pos, len);
+ return ret;
+}
+
+static loff_t
+iomap_write_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
+ struct iomap *iomap)
+{
+ struct iov_iter *i = data;
+ long status = 0;
+ ssize_t written = 0;
+ unsigned int flags = AOP_FLAG_NOFS;
+
+ /*
+ * Copies from kernel address space cannot fail (NFSD is a big user).
+ */
+ if (!iter_is_iovec(i))
+ flags |= AOP_FLAG_UNINTERRUPTIBLE;
+
+ do {
+ struct page *page;
+ unsigned long offset; /* Offset into pagecache page */
+ unsigned long bytes; /* Bytes to write to page */
+ size_t copied; /* Bytes copied from user */
+
+ offset = (pos & (PAGE_SIZE - 1));
+ bytes = min_t(unsigned long, PAGE_SIZE - offset,
+ iov_iter_count(i));
+again:
+ if (bytes > length)
+ bytes = length;
+
+ /*
+ * Bring in the user page that we will copy from _first_.
+ * Otherwise there's a nasty deadlock on copying from the
+ * same page as we're writing to, without it being marked
+ * up-to-date.
+ *
+ * Not only is this an optimisation, but it is also required
+ * to check that the address is actually valid, when atomic
+ * usercopies are used, below.
+ */
+ if (unlikely(iov_iter_fault_in_readable(i, bytes))) {
+ status = -EFAULT;
+ break;
+ }
+
+ status = iomap_write_begin(inode, pos, bytes, flags, &page,
+ iomap);
+ if (unlikely(status))
+ break;
+
+ if (mapping_writably_mapped(inode->i_mapping))
+ flush_dcache_page(page);
+
+ pagefault_disable();
+ copied = iov_iter_copy_from_user_atomic(page, i, offset, bytes);
+ pagefault_enable();
+
+ flush_dcache_page(page);
+ mark_page_accessed(page);
+
+ status = iomap_write_end(inode, pos, bytes, copied, page);
+ if (unlikely(status < 0))
+ break;
+ copied = status;
+
+ cond_resched();
+
+ iov_iter_advance(i, copied);
+ if (unlikely(copied == 0)) {
+ /*
+ * If we were unable to copy any data at all, we must
+ * fall back to a single segment length write.
+ *
+ * If we didn't fallback here, we could livelock
+ * because not all segments in the iov can be copied at
+ * once without a pagefault.
+ */
+ bytes = min_t(unsigned long, PAGE_SIZE - offset,
+ iov_iter_single_seg_count(i));
+ goto again;
+ }
+ pos += copied;
+ written += copied;
+ length -= copied;
+
+ balance_dirty_pages_ratelimited(inode->i_mapping);
+ } while (iov_iter_count(i) && length);
+
+ return written ? written : status;
+}
+
+ssize_t
+iomap_file_buffered_write(struct kiocb *iocb, struct iov_iter *iter,
+ struct iomap_ops *ops)
+{
+ struct inode *inode = iocb->ki_filp->f_mapping->host;
+ loff_t pos = iocb->ki_pos, ret = 0, written = 0;
+
+ while (iov_iter_count(iter)) {
+ ret = iomap_apply(inode, pos, iov_iter_count(iter),
+ IOMAP_WRITE, ops, iter, iomap_write_actor);
+ if (ret <= 0)
+ break;
+ pos += ret;
+ written += ret;
+ }
+
+ return written ? written : ret;
+}
+EXPORT_SYMBOL_GPL(iomap_file_buffered_write);
+
+static int iomap_zero(struct inode *inode, loff_t pos, unsigned offset,
+ unsigned bytes, struct iomap *iomap)
+{
+ struct page *page;
+ int status;
+
+ status = iomap_write_begin(inode, pos, bytes,
+ AOP_FLAG_UNINTERRUPTIBLE | AOP_FLAG_NOFS, &page, iomap);
+ if (status)
+ return status;
+
+ zero_user(page, offset, bytes);
+ mark_page_accessed(page);
+
+ return iomap_write_end(inode, pos, bytes, bytes, page);
+}
+
+static int iomap_dax_zero(loff_t pos, unsigned offset, unsigned bytes,
+ struct iomap *iomap)
+{
+ sector_t sector = iomap->blkno +
+ (((pos & ~(PAGE_SIZE - 1)) - iomap->offset) >> 9);
+
+ return __dax_zero_page_range(iomap->bdev, sector, offset, bytes);
+}
+
+static loff_t
+iomap_zero_range_actor(struct inode *inode, loff_t pos, loff_t count,
+ void *data, struct iomap *iomap)
+{
+ bool *did_zero = data;
+ loff_t written = 0;
+ int status;
+
+ /* already zeroed? we're done. */
+ if (iomap->type == IOMAP_HOLE || iomap->type == IOMAP_UNWRITTEN)
+ return count;
+
+ do {
+ unsigned offset, bytes;
+
+ offset = pos & (PAGE_SIZE - 1); /* Within page */
+ bytes = min_t(unsigned, PAGE_SIZE - offset, count);
+
+ if (IS_DAX(inode))
+ status = iomap_dax_zero(pos, offset, bytes, iomap);
+ else
+ status = iomap_zero(inode, pos, offset, bytes, iomap);
+ if (status < 0)
+ return status;
+
+ pos += bytes;
+ count -= bytes;
+ written += bytes;
+ if (did_zero)
+ *did_zero = true;
+ } while (count > 0);
+
+ return written;
+}
+
+int
+iomap_zero_range(struct inode *inode, loff_t pos, loff_t len, bool *did_zero,
+ struct iomap_ops *ops)
+{
+ loff_t ret;
+
+ while (len > 0) {
+ ret = iomap_apply(inode, pos, len, IOMAP_ZERO,
+ ops, did_zero, iomap_zero_range_actor);
+ if (ret <= 0)
+ return ret;
+
+ pos += ret;
+ len -= ret;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(iomap_zero_range);
+
+int
+iomap_truncate_page(struct inode *inode, loff_t pos, bool *did_zero,
+ struct iomap_ops *ops)
+{
+ unsigned blocksize = (1 << inode->i_blkbits);
+ unsigned off = pos & (blocksize - 1);
+
+ /* Block boundary? Nothing to do */
+ if (!off)
+ return 0;
+ return iomap_zero_range(inode, pos, blocksize - off, did_zero, ops);
+}
+EXPORT_SYMBOL_GPL(iomap_truncate_page);
+
+static loff_t
+iomap_page_mkwrite_actor(struct inode *inode, loff_t pos, loff_t length,
+ void *data, struct iomap *iomap)
+{
+ struct page *page = data;
+ int ret;
+
+ ret = __block_write_begin_int(page, pos & ~PAGE_MASK, length,
+ NULL, iomap);
+ if (ret)
+ return ret;
+
+ block_commit_write(page, 0, length);
+ return length;
+}
+
+int iomap_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf,
+ struct iomap_ops *ops)
+{
+ struct page *page = vmf->page;
+ struct inode *inode = file_inode(vma->vm_file);
+ unsigned long length;
+ loff_t offset, size;
+ ssize_t ret;
+
+ lock_page(page);
+ size = i_size_read(inode);
+ if ((page->mapping != inode->i_mapping) ||
+ (page_offset(page) > size)) {
+ /* We overload EFAULT to mean page got truncated */
+ ret = -EFAULT;
+ goto out_unlock;
+ }
+
+ /* page is wholly or partially inside EOF */
+ if (((page->index + 1) << PAGE_SHIFT) > size)
+ length = size & ~PAGE_MASK;
+ else
+ length = PAGE_SIZE;
+
+ offset = page_offset(page);
+ while (length > 0) {
+ ret = iomap_apply(inode, offset, length, IOMAP_WRITE,
+ ops, page, iomap_page_mkwrite_actor);
+ if (unlikely(ret <= 0))
+ goto out_unlock;
+ offset += ret;
+ length -= ret;
+ }
+
+ set_page_dirty(page);
+ wait_for_stable_page(page);
+ return 0;
+out_unlock:
+ unlock_page(page);
+ return ret;
+}
+EXPORT_SYMBOL_GPL(iomap_page_mkwrite);
+
+struct fiemap_ctx {
+ struct fiemap_extent_info *fi;
+ struct iomap prev;
+};
+
+static int iomap_to_fiemap(struct fiemap_extent_info *fi,
+ struct iomap *iomap, u32 flags)
+{
+ switch (iomap->type) {
+ case IOMAP_HOLE:
+ /* skip holes */
+ return 0;
+ case IOMAP_DELALLOC:
+ flags |= FIEMAP_EXTENT_DELALLOC | FIEMAP_EXTENT_UNKNOWN;
+ break;
+ case IOMAP_UNWRITTEN:
+ flags |= FIEMAP_EXTENT_UNWRITTEN;
+ break;
+ case IOMAP_MAPPED:
+ break;
+ }
+
+ return fiemap_fill_next_extent(fi, iomap->offset,
+ iomap->blkno != IOMAP_NULL_BLOCK ? iomap->blkno << 9: 0,
+ iomap->length, flags | FIEMAP_EXTENT_MERGED);
+
+}
+
+static loff_t
+iomap_fiemap_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
+ struct iomap *iomap)
+{
+ struct fiemap_ctx *ctx = data;
+ loff_t ret = length;
+
+ if (iomap->type == IOMAP_HOLE)
+ return length;
+
+ ret = iomap_to_fiemap(ctx->fi, &ctx->prev, 0);
+ ctx->prev = *iomap;
+ switch (ret) {
+ case 0: /* success */
+ return length;
+ case 1: /* extent array full */
+ return 0;
+ default:
+ return ret;
+ }
+}
+
+int iomap_fiemap(struct inode *inode, struct fiemap_extent_info *fi,
+ loff_t start, loff_t len, struct iomap_ops *ops)
+{
+ struct fiemap_ctx ctx;
+ loff_t ret;
+
+ memset(&ctx, 0, sizeof(ctx));
+ ctx.fi = fi;
+ ctx.prev.type = IOMAP_HOLE;
+
+ ret = fiemap_check_flags(fi, FIEMAP_FLAG_SYNC);
+ if (ret)
+ return ret;
+
+ ret = filemap_write_and_wait(inode->i_mapping);
+ if (ret)
+ return ret;
+
+ while (len > 0) {
+ ret = iomap_apply(inode, start, len, 0, ops, &ctx,
+ iomap_fiemap_actor);
+ if (ret < 0)
+ return ret;
+ if (ret == 0)
+ break;
+
+ start += ret;
+ len -= ret;
+ }
+
+ if (ctx.prev.type != IOMAP_HOLE) {
+ ret = iomap_to_fiemap(fi, &ctx.prev, FIEMAP_EXTENT_LAST);
+ if (ret < 0)
+ return ret;
+ }
+
+ return 0;
+}
+EXPORT_SYMBOL_GPL(iomap_fiemap);
diff --git a/fs/nfsd/blocklayout.c b/fs/nfsd/blocklayout.c
index 31f3df193bdbb47b82dbe8df7f67b33163d55828..ad2c05e80a836fcc49002802357f049f61852732 100644
--- a/fs/nfsd/blocklayout.c
+++ b/fs/nfsd/blocklayout.c
@@ -2,6 +2,7 @@
* Copyright (c) 2014-2016 Christoph Hellwig.
*/
#include <linux/exportfs.h>
+#include <linux/iomap.h>
#include <linux/genhd.h>
#include <linux/slab.h>
#include <linux/pr.h>
diff --git a/fs/nfsd/blocklayoutxdr.c b/fs/nfsd/blocklayoutxdr.c
index 6c3b316f932e94d993f34a054f88e0e7355ff8fd..4ebaaf4b8d8a425d98418f09f9b445ff9615da32 100644
--- a/fs/nfsd/blocklayoutxdr.c
+++ b/fs/nfsd/blocklayoutxdr.c
@@ -3,6 +3,7 @@
*/
#include <linux/sunrpc/svc.h>
#include <linux/exportfs.h>
+#include <linux/iomap.h>
#include <linux/nfs4.h>
#include "nfsd.h"
diff --git a/fs/xfs/Kconfig b/fs/xfs/Kconfig
index 5d47b4df61eac13fe2176455fcb20c9f86de1dde..35faf128f36d8d3c8b0ac3e279bd2b59029ec856 100644
--- a/fs/xfs/Kconfig
+++ b/fs/xfs/Kconfig
@@ -4,6 +4,7 @@ config XFS_FS
depends on (64BIT || LBDAF)
select EXPORTFS
select LIBCRC32C
+ select FS_IOMAP
help
XFS is a high performance journaling filesystem which originated
on the SGI IRIX platform. It is completely multi-threaded, can
diff --git a/fs/xfs/libxfs/xfs_alloc.c b/fs/xfs/libxfs/xfs_alloc.c
index a708e38b494c702edb9105706555615dbb8cf8ea..88c26b827a2dd0819464a82222d822bb3f8e9202 100644
--- a/fs/xfs/libxfs/xfs_alloc.c
+++ b/fs/xfs/libxfs/xfs_alloc.c
@@ -84,7 +84,7 @@ xfs_alloc_lookup_ge(
* Lookup the first record less than or equal to [bno, len]
* in the btree given by cur.
*/
-int /* error */
+static int /* error */
xfs_alloc_lookup_le(
struct xfs_btree_cur *cur, /* btree cursor */
xfs_agblock_t bno, /* starting block of extent */
@@ -1839,19 +1839,8 @@ void
xfs_alloc_compute_maxlevels(
xfs_mount_t *mp) /* file system mount structure */
{
- int level;
- uint maxblocks;
- uint maxleafents;
- int minleafrecs;
- int minnoderecs;
-
- maxleafents = (mp->m_sb.sb_agblocks + 1) / 2;
- minleafrecs = mp->m_alloc_mnr[0];
- minnoderecs = mp->m_alloc_mnr[1];
- maxblocks = (maxleafents + minleafrecs - 1) / minleafrecs;
- for (level = 1; maxblocks > 1; level++)
- maxblocks = (maxblocks + minnoderecs - 1) / minnoderecs;
- mp->m_ag_maxlevels = level;
+ mp->m_ag_maxlevels = xfs_btree_compute_maxlevels(mp, mp->m_alloc_mnr,
+ (mp->m_sb.sb_agblocks + 1) / 2);
}
/*
@@ -2658,55 +2647,79 @@ xfs_alloc_vextent(
return error;
}
-/*
- * Free an extent.
- * Just break up the extent address and hand off to xfs_free_ag_extent
- * after fixing up the freelist.
- */
-int /* error */
-xfs_free_extent(
- xfs_trans_t *tp, /* transaction pointer */
- xfs_fsblock_t bno, /* starting block number of extent */
- xfs_extlen_t len) /* length of extent */
+/* Ensure that the freelist is at full capacity. */
+int
+xfs_free_extent_fix_freelist(
+ struct xfs_trans *tp,
+ xfs_agnumber_t agno,
+ struct xfs_buf **agbp)
{
- xfs_alloc_arg_t args;
- int error;
+ struct xfs_alloc_arg args;
+ int error;
- ASSERT(len != 0);
- memset(&args, 0, sizeof(xfs_alloc_arg_t));
+ memset(&args, 0, sizeof(struct xfs_alloc_arg));
args.tp = tp;
args.mp = tp->t_mountp;
+ args.agno = agno;
/*
* validate that the block number is legal - the enables us to detect
* and handle a silent filesystem corruption rather than crashing.
*/
- args.agno = XFS_FSB_TO_AGNO(args.mp, bno);
if (args.agno >= args.mp->m_sb.sb_agcount)
return -EFSCORRUPTED;
- args.agbno = XFS_FSB_TO_AGBNO(args.mp, bno);
- if (args.agbno >= args.mp->m_sb.sb_agblocks)
- return -EFSCORRUPTED;
-
args.pag = xfs_perag_get(args.mp, args.agno);
ASSERT(args.pag);
error = xfs_alloc_fix_freelist(&args, XFS_ALLOC_FLAG_FREEING);
if (error)
- goto error0;
+ goto out;
+
+ *agbp = args.agbp;
+out:
+ xfs_perag_put(args.pag);
+ return error;
+}
+
+/*
+ * Free an extent.
+ * Just break up the extent address and hand off to xfs_free_ag_extent
+ * after fixing up the freelist.
+ */
+int /* error */
+xfs_free_extent(
+ struct xfs_trans *tp, /* transaction pointer */
+ xfs_fsblock_t bno, /* starting block number of extent */
+ xfs_extlen_t len) /* length of extent */
+{
+ struct xfs_mount *mp = tp->t_mountp;
+ struct xfs_buf *agbp;
+ xfs_agnumber_t agno = XFS_FSB_TO_AGNO(mp, bno);
+ xfs_agblock_t agbno = XFS_FSB_TO_AGBNO(mp, bno);
+ int error;
+
+ ASSERT(len != 0);
+
+ error = xfs_free_extent_fix_freelist(tp, agno, &agbp);
+ if (error)
+ return error;
+
+ XFS_WANT_CORRUPTED_GOTO(mp, agbno < mp->m_sb.sb_agblocks, err);
/* validate the extent size is legal now we have the agf locked */
- if (args.agbno + len >
- be32_to_cpu(XFS_BUF_TO_AGF(args.agbp)->agf_length)) {
- error = -EFSCORRUPTED;
- goto error0;
- }
+ XFS_WANT_CORRUPTED_GOTO(mp,
+ agbno + len <= be32_to_cpu(XFS_BUF_TO_AGF(agbp)->agf_length),
+ err);
- error = xfs_free_ag_extent(tp, args.agbp, args.agno, args.agbno, len, 0);
- if (!error)
- xfs_extent_busy_insert(tp, args.agno, args.agbno, len, 0);
-error0:
- xfs_perag_put(args.pag);
+ error = xfs_free_ag_extent(tp, agbp, agno, agbno, len, 0);
+ if (error)
+ goto err;
+
+ xfs_extent_busy_insert(tp, agno, agbno, len, 0);
+ return 0;
+
+err:
+ xfs_trans_brelse(tp, agbp);
return error;
}
diff --git a/fs/xfs/libxfs/xfs_alloc.h b/fs/xfs/libxfs/xfs_alloc.h
index 135eb3d24db7166bcafb659ab192d25f5ad6a104..cf268b2d0b6c2035aaad4b781d43e2cebeedcd54 100644
--- a/fs/xfs/libxfs/xfs_alloc.h
+++ b/fs/xfs/libxfs/xfs_alloc.h
@@ -212,13 +212,6 @@ xfs_free_extent(
xfs_fsblock_t bno, /* starting block number of extent */
xfs_extlen_t len); /* length of extent */
-int /* error */
-xfs_alloc_lookup_le(
- struct xfs_btree_cur *cur, /* btree cursor */
- xfs_agblock_t bno, /* starting block of extent */
- xfs_extlen_t len, /* length of extent */
- int *stat); /* success/failure */
-
int /* error */
xfs_alloc_lookup_ge(
struct xfs_btree_cur *cur, /* btree cursor */
@@ -236,5 +229,7 @@ xfs_alloc_get_rec(
int xfs_read_agf(struct xfs_mount *mp, struct xfs_trans *tp,
xfs_agnumber_t agno, int flags, struct xfs_buf **bpp);
int xfs_alloc_fix_freelist(struct xfs_alloc_arg *args, int flags);
+int xfs_free_extent_fix_freelist(struct xfs_trans *tp, xfs_agnumber_t agno,
+ struct xfs_buf **agbp);
#endif /* __XFS_ALLOC_H__ */
diff --git a/fs/xfs/libxfs/xfs_attr_leaf.h b/fs/xfs/libxfs/xfs_attr_leaf.h
index 882c8d3388913b3d44aa9105184920feb89709a6..4f2aed04f8273b5924f34180211dbb9b11e14aa4 100644
--- a/fs/xfs/libxfs/xfs_attr_leaf.h
+++ b/fs/xfs/libxfs/xfs_attr_leaf.h
@@ -50,7 +50,6 @@ int xfs_attr_shortform_lookup(struct xfs_da_args *args);
int xfs_attr_shortform_getvalue(struct xfs_da_args *args);
int xfs_attr_shortform_to_leaf(struct xfs_da_args *args);
int xfs_attr_shortform_remove(struct xfs_da_args *args);
-int xfs_attr_shortform_list(struct xfs_attr_list_context *context);
int xfs_attr_shortform_allfit(struct xfs_buf *bp, struct xfs_inode *dp);
int xfs_attr_shortform_bytesfit(xfs_inode_t *dp, int bytes);
void xfs_attr_fork_remove(struct xfs_inode *ip, struct xfs_trans *tp);
@@ -88,8 +87,6 @@ int xfs_attr3_leaf_toosmall(struct xfs_da_state *state, int *retval);
void xfs_attr3_leaf_unbalance(struct xfs_da_state *state,
struct xfs_da_state_blk *drop_blk,
struct xfs_da_state_blk *save_blk);
-int xfs_attr3_root_inactive(struct xfs_trans **trans, struct xfs_inode *dp);
-
/*
* Utility routines.
*/
diff --git a/fs/xfs/libxfs/xfs_bmap.c b/fs/xfs/libxfs/xfs_bmap.c
index 932381caef1bc421cb9a41e79191845d6fc60346..2f2c85cc81173dec19952d2a5ae4efe2f9377983 100644
--- a/fs/xfs/libxfs/xfs_bmap.c
+++ b/fs/xfs/libxfs/xfs_bmap.c
@@ -570,14 +570,12 @@ xfs_bmap_validate_ret(
*/
void
xfs_bmap_add_free(
+ struct xfs_mount *mp, /* mount point structure */
+ struct xfs_bmap_free *flist, /* list of extents */
xfs_fsblock_t bno, /* fs block number of extent */
- xfs_filblks_t len, /* length of extent */
- xfs_bmap_free_t *flist, /* list of extents */
- xfs_mount_t *mp) /* mount point structure */
+ xfs_filblks_t len) /* length of extent */
{
- xfs_bmap_free_item_t *cur; /* current (next) element */
- xfs_bmap_free_item_t *new; /* new element */
- xfs_bmap_free_item_t *prev; /* previous element */
+ struct xfs_bmap_free_item *new; /* new element */
#ifdef DEBUG
xfs_agnumber_t agno;
xfs_agblock_t agbno;
@@ -597,17 +595,7 @@ xfs_bmap_add_free(
new = kmem_zone_alloc(xfs_bmap_free_item_zone, KM_SLEEP);
new->xbfi_startblock = bno;
new->xbfi_blockcount = (xfs_extlen_t)len;
- for (prev = NULL, cur = flist->xbf_first;
- cur != NULL;
- prev = cur, cur = cur->xbfi_next) {
- if (cur->xbfi_startblock >= bno)
- break;
- }
- if (prev)
- prev->xbfi_next = new;
- else
- flist->xbf_first = new;
- new->xbfi_next = cur;
+ list_add(&new->xbfi_list, &flist->xbf_flist);
flist->xbf_count++;
}
@@ -617,14 +605,10 @@ xfs_bmap_add_free(
*/
void
xfs_bmap_del_free(
- xfs_bmap_free_t *flist, /* free item list header */
- xfs_bmap_free_item_t *prev, /* previous item on list, if any */
- xfs_bmap_free_item_t *free) /* list item to be freed */
+ struct xfs_bmap_free *flist, /* free item list header */
+ struct xfs_bmap_free_item *free) /* list item to be freed */
{
- if (prev)
- prev->xbfi_next = free->xbfi_next;
- else
- flist->xbf_first = free->xbfi_next;
+ list_del(&free->xbfi_list);
flist->xbf_count--;
kmem_zone_free(xfs_bmap_free_item_zone, free);
}
@@ -634,17 +618,16 @@ xfs_bmap_del_free(
*/
void
xfs_bmap_cancel(
- xfs_bmap_free_t *flist) /* list of bmap_free_items */
+ struct xfs_bmap_free *flist) /* list of bmap_free_items */
{
- xfs_bmap_free_item_t *free; /* free list item */
- xfs_bmap_free_item_t *next;
+ struct xfs_bmap_free_item *free; /* free list item */
if (flist->xbf_count == 0)
return;
- ASSERT(flist->xbf_first != NULL);
- for (free = flist->xbf_first; free; free = next) {
- next = free->xbfi_next;
- xfs_bmap_del_free(flist, NULL, free);
+ while (!list_empty(&flist->xbf_flist)) {
+ free = list_first_entry(&flist->xbf_flist,
+ struct xfs_bmap_free_item, xbfi_list);
+ xfs_bmap_del_free(flist, free);
}
ASSERT(flist->xbf_count == 0);
}
@@ -699,7 +682,7 @@ xfs_bmap_btree_to_extents(
cblock = XFS_BUF_TO_BLOCK(cbp);
if ((error = xfs_btree_check_block(cur, cblock, 0, cbp)))
return error;
- xfs_bmap_add_free(cbno, 1, cur->bc_private.b.flist, mp);
+ xfs_bmap_add_free(mp, cur->bc_private.b.flist, cbno, 1);
ip->i_d.di_nblocks--;
xfs_trans_mod_dquot_byino(tp, ip, XFS_TRANS_DQ_BCOUNT, -1L);
xfs_trans_binval(tp, cbp);
@@ -5073,8 +5056,8 @@ xfs_bmap_del_extent(
* If we need to, add to list of extents to delete.
*/
if (do_fx)
- xfs_bmap_add_free(del->br_startblock, del->br_blockcount, flist,
- mp);
+ xfs_bmap_add_free(mp, flist, del->br_startblock,
+ del->br_blockcount);
/*
* Adjust inode # blocks in the file.
*/
diff --git a/fs/xfs/libxfs/xfs_bmap.h b/fs/xfs/libxfs/xfs_bmap.h
index 423a34e832bdc07ab402a3f17023ac311ba1251b..f1f3ae6c0a3f5d9b507002819afb4632eb1f95ba 100644
--- a/fs/xfs/libxfs/xfs_bmap.h
+++ b/fs/xfs/libxfs/xfs_bmap.h
@@ -62,12 +62,12 @@ struct xfs_bmalloca {
* List of extents to be free "later".
* The list is kept sorted on xbf_startblock.
*/
-typedef struct xfs_bmap_free_item
+struct xfs_bmap_free_item
{
xfs_fsblock_t xbfi_startblock;/* starting fs block number */
xfs_extlen_t xbfi_blockcount;/* number of blocks in extent */
- struct xfs_bmap_free_item *xbfi_next; /* link to next entry */
-} xfs_bmap_free_item_t;
+ struct list_head xbfi_list;
+};
/*
* Header for free extent list.
@@ -85,7 +85,7 @@ typedef struct xfs_bmap_free_item
*/
typedef struct xfs_bmap_free
{
- xfs_bmap_free_item_t *xbf_first; /* list of to-be-free extents */
+ struct list_head xbf_flist; /* list of to-be-free extents */
int xbf_count; /* count of items on list */
int xbf_low; /* alloc in low mode */
} xfs_bmap_free_t;
@@ -141,8 +141,10 @@ static inline int xfs_bmapi_aflag(int w)
static inline void xfs_bmap_init(xfs_bmap_free_t *flp, xfs_fsblock_t *fbp)
{
- ((flp)->xbf_first = NULL, (flp)->xbf_count = 0, \
- (flp)->xbf_low = 0, *(fbp) = NULLFSBLOCK);
+ INIT_LIST_HEAD(&flp->xbf_flist);
+ flp->xbf_count = 0;
+ flp->xbf_low = 0;
+ *fbp = NULLFSBLOCK;
}
/*
@@ -191,8 +193,8 @@ void xfs_bmap_trace_exlist(struct xfs_inode *ip, xfs_extnum_t cnt,
int xfs_bmap_add_attrfork(struct xfs_inode *ip, int size, int rsvd);
void xfs_bmap_local_to_extents_empty(struct xfs_inode *ip, int whichfork);
-void xfs_bmap_add_free(xfs_fsblock_t bno, xfs_filblks_t len,
- struct xfs_bmap_free *flist, struct xfs_mount *mp);
+void xfs_bmap_add_free(struct xfs_mount *mp, struct xfs_bmap_free *flist,
+ xfs_fsblock_t bno, xfs_filblks_t len);
void xfs_bmap_cancel(struct xfs_bmap_free *flist);
int xfs_bmap_finish(struct xfs_trans **tp, struct xfs_bmap_free *flist,
struct xfs_inode *ip);
diff --git a/fs/xfs/libxfs/xfs_bmap_btree.c b/fs/xfs/libxfs/xfs_bmap_btree.c
index 6282f6e708afaf4ca2a15999b1864b507c6d5ed5..db0c71e470c9575d54d5fd2a268eda6c49f7ff3a 100644
--- a/fs/xfs/libxfs/xfs_bmap_btree.c
+++ b/fs/xfs/libxfs/xfs_bmap_btree.c
@@ -526,7 +526,7 @@ xfs_bmbt_free_block(
struct xfs_trans *tp = cur->bc_tp;
xfs_fsblock_t fsbno = XFS_DADDR_TO_FSB(mp, XFS_BUF_ADDR(bp));
- xfs_bmap_add_free(fsbno, 1, cur->bc_private.b.flist, mp);
+ xfs_bmap_add_free(mp, cur->bc_private.b.flist, fsbno, 1);
ip->i_d.di_nblocks--;
xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE);
diff --git a/fs/xfs/libxfs/xfs_btree.c b/fs/xfs/libxfs/xfs_btree.c
index 1f88e1ce770f35442f0161466632c68fe0e46153..07eeb0b4ca74f1253eccbc3a2d0434278f0165ee 100644
--- a/fs/xfs/libxfs/xfs_btree.c
+++ b/fs/xfs/libxfs/xfs_btree.c
@@ -543,12 +543,12 @@ xfs_btree_ptr_addr(
*/
STATIC struct xfs_btree_block *
xfs_btree_get_iroot(
- struct xfs_btree_cur *cur)
+ struct xfs_btree_cur *cur)
{
- struct xfs_ifork *ifp;
+ struct xfs_ifork *ifp;
- ifp = XFS_IFORK_PTR(cur->bc_private.b.ip, cur->bc_private.b.whichfork);
- return (struct xfs_btree_block *)ifp->if_broot;
+ ifp = XFS_IFORK_PTR(cur->bc_private.b.ip, cur->bc_private.b.whichfork);
+ return (struct xfs_btree_block *)ifp->if_broot;
}
/*
@@ -4152,3 +4152,22 @@ xfs_btree_sblock_verify(
return true;
}
+
+/*
+ * Calculate the number of btree levels needed to store a given number of
+ * records in a short-format btree.
+ */
+uint
+xfs_btree_compute_maxlevels(
+ struct xfs_mount *mp,
+ uint *limits,
+ unsigned long len)
+{
+ uint level;
+ unsigned long maxblocks;
+
+ maxblocks = (len + limits[0] - 1) / limits[0];
+ for (level = 1; maxblocks > 1; level++)
+ maxblocks = (maxblocks + limits[1] - 1) / limits[1];
+ return level;
+}
diff --git a/fs/xfs/libxfs/xfs_btree.h b/fs/xfs/libxfs/xfs_btree.h
index 2e874be702093f1409fb7428efc5a1bdbc0e3bcd..785a996821591c89e9a74cea413789225c7ba890 100644
--- a/fs/xfs/libxfs/xfs_btree.h
+++ b/fs/xfs/libxfs/xfs_btree.h
@@ -474,5 +474,7 @@ static inline int xfs_btree_get_level(struct xfs_btree_block *block)
bool xfs_btree_sblock_v5hdr_verify(struct xfs_buf *bp);
bool xfs_btree_sblock_verify(struct xfs_buf *bp, unsigned int max_recs);
+uint xfs_btree_compute_maxlevels(struct xfs_mount *mp, uint *limits,
+ unsigned long len);
#endif /* __XFS_BTREE_H__ */
diff --git a/fs/xfs/libxfs/xfs_da_btree.c b/fs/xfs/libxfs/xfs_da_btree.c
index 097bf7717d8055693e9a2285c9f5a4ff30509281..0f1f165f404864dc31e4a43b56124610ab6b57cc 100644
--- a/fs/xfs/libxfs/xfs_da_btree.c
+++ b/fs/xfs/libxfs/xfs_da_btree.c
@@ -356,7 +356,6 @@ xfs_da3_split(
struct xfs_da_state_blk *newblk;
struct xfs_da_state_blk *addblk;
struct xfs_da_intnode *node;
- struct xfs_buf *bp;
int max;
int action = 0;
int error;
@@ -397,7 +396,9 @@ xfs_da3_split(
break;
}
/*
- * Entry wouldn't fit, split the leaf again.
+ * Entry wouldn't fit, split the leaf again. The new
+ * extrablk will be consumed by xfs_da3_node_split if
+ * the node is split.
*/
state->extravalid = 1;
if (state->inleaf) {
@@ -445,6 +446,14 @@ xfs_da3_split(
if (!addblk)
return 0;
+ /*
+ * xfs_da3_node_split() should have consumed any extra blocks we added
+ * during a double leaf split in the attr fork. This is guaranteed as
+ * we can't be here if the attr fork only has a single leaf block.
+ */
+ ASSERT(state->extravalid == 0 ||
+ state->path.blk[max].magic == XFS_DIR2_LEAFN_MAGIC);
+
/*
* Split the root node.
*/
@@ -457,43 +466,33 @@ xfs_da3_split(
}
/*
- * Update pointers to the node which used to be block 0 and
- * just got bumped because of the addition of a new root node.
- * There might be three blocks involved if a double split occurred,
- * and the original block 0 could be at any position in the list.
+ * Update pointers to the node which used to be block 0 and just got
+ * bumped because of the addition of a new root node. Note that the
+ * original block 0 could be at any position in the list of blocks in
+ * the tree.
*
- * Note: the magic numbers and sibling pointers are in the same
- * physical place for both v2 and v3 headers (by design). Hence it
- * doesn't matter which version of the xfs_da_intnode structure we use
- * here as the result will be the same using either structure.
+ * Note: the magic numbers and sibling pointers are in the same physical
+ * place for both v2 and v3 headers (by design). Hence it doesn't matter
+ * which version of the xfs_da_intnode structure we use here as the
+ * result will be the same using either structure.
*/
node = oldblk->bp->b_addr;
if (node->hdr.info.forw) {
- if (be32_to_cpu(node->hdr.info.forw) == addblk->blkno) {
- bp = addblk->bp;
- } else {
- ASSERT(state->extravalid);
- bp = state->extrablk.bp;
- }
- node = bp->b_addr;
+ ASSERT(be32_to_cpu(node->hdr.info.forw) == addblk->blkno);
+ node = addblk->bp->b_addr;
node->hdr.info.back = cpu_to_be32(oldblk->blkno);
- xfs_trans_log_buf(state->args->trans, bp,
- XFS_DA_LOGRANGE(node, &node->hdr.info,
- sizeof(node->hdr.info)));
+ xfs_trans_log_buf(state->args->trans, addblk->bp,
+ XFS_DA_LOGRANGE(node, &node->hdr.info,
+ sizeof(node->hdr.info)));
}
node = oldblk->bp->b_addr;
if (node->hdr.info.back) {
- if (be32_to_cpu(node->hdr.info.back) == addblk->blkno) {
- bp = addblk->bp;
- } else {
- ASSERT(state->extravalid);
- bp = state->extrablk.bp;
- }
- node = bp->b_addr;
+ ASSERT(be32_to_cpu(node->hdr.info.back) == addblk->blkno);
+ node = addblk->bp->b_addr;
node->hdr.info.forw = cpu_to_be32(oldblk->blkno);
- xfs_trans_log_buf(state->args->trans, bp,
- XFS_DA_LOGRANGE(node, &node->hdr.info,
- sizeof(node->hdr.info)));
+ xfs_trans_log_buf(state->args->trans, addblk->bp,
+ XFS_DA_LOGRANGE(node, &node->hdr.info,
+ sizeof(node->hdr.info)));
}
addblk->bp = NULL;
return 0;
diff --git a/fs/xfs/libxfs/xfs_da_format.c b/fs/xfs/libxfs/xfs_da_format.c
index 9d624a6229468f721beaba38826008492f325aa0..f1e8d4dbb60015093a76142e149b6db5ee2f9a57 100644
--- a/fs/xfs/libxfs/xfs_da_format.c
+++ b/fs/xfs/libxfs/xfs_da_format.c
@@ -40,8 +40,7 @@ xfs_dir2_sf_entsize(
int count = sizeof(struct xfs_dir2_sf_entry); /* namelen + offset */
count += len; /* name */
- count += hdr->i8count ? sizeof(xfs_dir2_ino8_t) :
- sizeof(xfs_dir2_ino4_t); /* ino # */
+ count += hdr->i8count ? XFS_INO64_SIZE : XFS_INO32_SIZE; /* ino # */
return count;
}
@@ -125,33 +124,33 @@ xfs_dir3_sfe_put_ftype(
static xfs_ino_t
xfs_dir2_sf_get_ino(
struct xfs_dir2_sf_hdr *hdr,
- xfs_dir2_inou_t *from)
+ __uint8_t *from)
{
if (hdr->i8count)
- return get_unaligned_be64(&from->i8.i) & 0x00ffffffffffffffULL;
+ return get_unaligned_be64(from) & 0x00ffffffffffffffULL;
else
- return get_unaligned_be32(&from->i4.i);
+ return get_unaligned_be32(from);
}
static void
xfs_dir2_sf_put_ino(
struct xfs_dir2_sf_hdr *hdr,
- xfs_dir2_inou_t *to,
+ __uint8_t *to,
xfs_ino_t ino)
{
ASSERT((ino & 0xff00000000000000ULL) == 0);
if (hdr->i8count)
- put_unaligned_be64(ino, &to->i8.i);
+ put_unaligned_be64(ino, to);
else
- put_unaligned_be32(ino, &to->i4.i);
+ put_unaligned_be32(ino, to);
}
static xfs_ino_t
xfs_dir2_sf_get_parent_ino(
struct xfs_dir2_sf_hdr *hdr)
{
- return xfs_dir2_sf_get_ino(hdr, &hdr->parent);
+ return xfs_dir2_sf_get_ino(hdr, hdr->parent);
}
static void
@@ -159,7 +158,7 @@ xfs_dir2_sf_put_parent_ino(
struct xfs_dir2_sf_hdr *hdr,
xfs_ino_t ino)
{
- xfs_dir2_sf_put_ino(hdr, &hdr->parent, ino);
+ xfs_dir2_sf_put_ino(hdr, hdr->parent, ino);
}
/*
@@ -173,8 +172,7 @@ xfs_dir2_sfe_get_ino(
struct xfs_dir2_sf_hdr *hdr,
struct xfs_dir2_sf_entry *sfep)
{
- return xfs_dir2_sf_get_ino(hdr,
- (xfs_dir2_inou_t *)&sfep->name[sfep->namelen]);
+ return xfs_dir2_sf_get_ino(hdr, &sfep->name[sfep->namelen]);
}
static void
@@ -183,8 +181,7 @@ xfs_dir2_sfe_put_ino(
struct xfs_dir2_sf_entry *sfep,
xfs_ino_t ino)
{
- xfs_dir2_sf_put_ino(hdr,
- (xfs_dir2_inou_t *)&sfep->name[sfep->namelen], ino);
+ xfs_dir2_sf_put_ino(hdr, &sfep->name[sfep->namelen], ino);
}
static xfs_ino_t
@@ -192,8 +189,7 @@ xfs_dir3_sfe_get_ino(
struct xfs_dir2_sf_hdr *hdr,
struct xfs_dir2_sf_entry *sfep)
{
- return xfs_dir2_sf_get_ino(hdr,
- (xfs_dir2_inou_t *)&sfep->name[sfep->namelen + 1]);
+ return xfs_dir2_sf_get_ino(hdr, &sfep->name[sfep->namelen + 1]);
}
static void
@@ -202,8 +198,7 @@ xfs_dir3_sfe_put_ino(
struct xfs_dir2_sf_entry *sfep,
xfs_ino_t ino)
{
- xfs_dir2_sf_put_ino(hdr,
- (xfs_dir2_inou_t *)&sfep->name[sfep->namelen + 1], ino);
+ xfs_dir2_sf_put_ino(hdr, &sfep->name[sfep->namelen + 1], ino);
}
diff --git a/fs/xfs/libxfs/xfs_da_format.h b/fs/xfs/libxfs/xfs_da_format.h
index 8d4d8bce41bf7873fec0fc8211801207a0a46494..685f23b670568ea3df1f2944d70ac6e3ea2cc238 100644
--- a/fs/xfs/libxfs/xfs_da_format.h
+++ b/fs/xfs/libxfs/xfs_da_format.h
@@ -191,12 +191,6 @@ typedef __uint16_t xfs_dir2_data_off_t;
#define NULLDATAOFF 0xffffU
typedef uint xfs_dir2_data_aoff_t; /* argument form */
-/*
- * Normalized offset (in a data block) of the entry, really xfs_dir2_data_off_t.
- * Only need 16 bits, this is the byte offset into the single block form.
- */
-typedef struct { __uint8_t i[2]; } __arch_pack xfs_dir2_sf_off_t;
-
/*
* Offset in data space of a data entry.
*/
@@ -214,22 +208,10 @@ typedef xfs_off_t xfs_dir2_off_t;
*/
typedef __uint32_t xfs_dir2_db_t;
-/*
- * Inode number stored as 8 8-bit values.
- */
-typedef struct { __uint8_t i[8]; } xfs_dir2_ino8_t;
-
-/*
- * Inode number stored as 4 8-bit values.
- * Works a lot of the time, when all the inode numbers in a directory
- * fit in 32 bits.
- */
-typedef struct { __uint8_t i[4]; } xfs_dir2_ino4_t;
+#define XFS_INO32_SIZE 4
+#define XFS_INO64_SIZE 8
+#define XFS_INO64_DIFF (XFS_INO64_SIZE - XFS_INO32_SIZE)
-typedef union {
- xfs_dir2_ino8_t i8;
- xfs_dir2_ino4_t i4;
-} xfs_dir2_inou_t;
#define XFS_DIR2_MAX_SHORT_INUM ((xfs_ino_t)0xffffffffULL)
/*
@@ -246,39 +228,38 @@ typedef union {
typedef struct xfs_dir2_sf_hdr {
__uint8_t count; /* count of entries */
__uint8_t i8count; /* count of 8-byte inode #s */
- xfs_dir2_inou_t parent; /* parent dir inode number */
-} __arch_pack xfs_dir2_sf_hdr_t;
+ __uint8_t parent[8]; /* parent dir inode number */
+} __packed xfs_dir2_sf_hdr_t;
typedef struct xfs_dir2_sf_entry {
__u8 namelen; /* actual name length */
- xfs_dir2_sf_off_t offset; /* saved offset */
+ __u8 offset[2]; /* saved offset */
__u8 name[]; /* name, variable size */
/*
* A single byte containing the file type field follows the inode
* number for version 3 directory entries.
*
- * A xfs_dir2_ino8_t or xfs_dir2_ino4_t follows here, at a
- * variable offset after the name.
+ * A 64-bit or 32-bit inode number follows here, at a variable offset
+ * after the name.
*/
-} __arch_pack xfs_dir2_sf_entry_t;
+} xfs_dir2_sf_entry_t;
static inline int xfs_dir2_sf_hdr_size(int i8count)
{
return sizeof(struct xfs_dir2_sf_hdr) -
- (i8count == 0) *
- (sizeof(xfs_dir2_ino8_t) - sizeof(xfs_dir2_ino4_t));
+ (i8count == 0) * XFS_INO64_DIFF;
}
static inline xfs_dir2_data_aoff_t
xfs_dir2_sf_get_offset(xfs_dir2_sf_entry_t *sfep)
{
- return get_unaligned_be16(&sfep->offset.i);
+ return get_unaligned_be16(sfep->offset);
}
static inline void
xfs_dir2_sf_put_offset(xfs_dir2_sf_entry_t *sfep, xfs_dir2_data_aoff_t off)
{
- put_unaligned_be16(off, &sfep->offset.i);
+ put_unaligned_be16(off, sfep->offset);
}
static inline struct xfs_dir2_sf_entry *
diff --git a/fs/xfs/libxfs/xfs_dir2_sf.c b/fs/xfs/libxfs/xfs_dir2_sf.c
index e5bb9cc3b243b9fd451db6dcc429edb6a24644bf..c6809ff41197d934c068e84b19eb77986bc7dccf 100644
--- a/fs/xfs/libxfs/xfs_dir2_sf.c
+++ b/fs/xfs/libxfs/xfs_dir2_sf.c
@@ -126,13 +126,12 @@ xfs_dir2_block_sfsize(
/*
* Calculate the new size, see if we should give up yet.
*/
- size = xfs_dir2_sf_hdr_size(i8count) + /* header */
- count + /* namelen */
- count * (uint)sizeof(xfs_dir2_sf_off_t) + /* offset */
- namelen + /* name */
- (i8count ? /* inumber */
- (uint)sizeof(xfs_dir2_ino8_t) * count :
- (uint)sizeof(xfs_dir2_ino4_t) * count);
+ size = xfs_dir2_sf_hdr_size(i8count) + /* header */
+ count * 3 * sizeof(u8) + /* namelen + offset */
+ namelen + /* name */
+ (i8count ? /* inumber */
+ count * XFS_INO64_SIZE :
+ count * XFS_INO32_SIZE);
if (size > XFS_IFORK_DSIZE(dp))
return size; /* size value is a failure */
}
@@ -319,10 +318,7 @@ xfs_dir2_sf_addname(
/*
* Yes, adjust the inode size. old count + (parent + new)
*/
- incr_isize +=
- (sfp->count + 2) *
- ((uint)sizeof(xfs_dir2_ino8_t) -
- (uint)sizeof(xfs_dir2_ino4_t));
+ incr_isize += (sfp->count + 2) * XFS_INO64_DIFF;
objchange = 1;
}
@@ -897,11 +893,7 @@ xfs_dir2_sf_replace(
int error; /* error return value */
int newsize; /* new inode size */
- newsize =
- dp->i_df.if_bytes +
- (sfp->count + 1) *
- ((uint)sizeof(xfs_dir2_ino8_t) -
- (uint)sizeof(xfs_dir2_ino4_t));
+ newsize = dp->i_df.if_bytes + (sfp->count + 1) * XFS_INO64_DIFF;
/*
* Won't fit as shortform, convert to block then do replace.
*/
@@ -1022,10 +1014,7 @@ xfs_dir2_sf_toino4(
/*
* Compute the new inode size.
*/
- newsize =
- oldsize -
- (oldsfp->count + 1) *
- ((uint)sizeof(xfs_dir2_ino8_t) - (uint)sizeof(xfs_dir2_ino4_t));
+ newsize = oldsize - (oldsfp->count + 1) * XFS_INO64_DIFF;
xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK);
xfs_idata_realloc(dp, newsize, XFS_DATA_FORK);
/*
@@ -1048,7 +1037,7 @@ xfs_dir2_sf_toino4(
i++, sfep = dp->d_ops->sf_nextentry(sfp, sfep),
oldsfep = dp->d_ops->sf_nextentry(oldsfp, oldsfep)) {
sfep->namelen = oldsfep->namelen;
- sfep->offset = oldsfep->offset;
+ memcpy(sfep->offset, oldsfep->offset, sizeof(sfep->offset));
memcpy(sfep->name, oldsfep->name, sfep->namelen);
dp->d_ops->sf_put_ino(sfp, sfep,
dp->d_ops->sf_get_ino(oldsfp, oldsfep));
@@ -1098,10 +1087,7 @@ xfs_dir2_sf_toino8(
/*
* Compute the new inode size (nb: entry count + 1 for parent)
*/
- newsize =
- oldsize +
- (oldsfp->count + 1) *
- ((uint)sizeof(xfs_dir2_ino8_t) - (uint)sizeof(xfs_dir2_ino4_t));
+ newsize = oldsize + (oldsfp->count + 1) * XFS_INO64_DIFF;
xfs_idata_realloc(dp, -oldsize, XFS_DATA_FORK);
xfs_idata_realloc(dp, newsize, XFS_DATA_FORK);
/*
@@ -1124,7 +1110,7 @@ xfs_dir2_sf_toino8(
i++, sfep = dp->d_ops->sf_nextentry(sfp, sfep),
oldsfep = dp->d_ops->sf_nextentry(oldsfp, oldsfep)) {
sfep->namelen = oldsfep->namelen;
- sfep->offset = oldsfep->offset;
+ memcpy(sfep->offset, oldsfep->offset, sizeof(sfep->offset));
memcpy(sfep->name, oldsfep->name, sfep->namelen);
dp->d_ops->sf_put_ino(sfp, sfep,
dp->d_ops->sf_get_ino(oldsfp, oldsfep));
diff --git a/fs/xfs/libxfs/xfs_format.h b/fs/xfs/libxfs/xfs_format.h
index dc97eb21af071b0e040fe0d74b8ba51214e28cf9..adb204d40f2246c181051566e385463f077e15ca 100644
--- a/fs/xfs/libxfs/xfs_format.h
+++ b/fs/xfs/libxfs/xfs_format.h
@@ -1435,41 +1435,57 @@ typedef __be64 xfs_bmbt_ptr_t, xfs_bmdr_ptr_t;
* with the crc feature bit, and all accesses to them must be conditional on
* that flag.
*/
+/* short form block header */
+struct xfs_btree_block_shdr {
+ __be32 bb_leftsib;
+ __be32 bb_rightsib;
+
+ __be64 bb_blkno;
+ __be64 bb_lsn;
+ uuid_t bb_uuid;
+ __be32 bb_owner;
+ __le32 bb_crc;
+};
+
+/* long form block header */
+struct xfs_btree_block_lhdr {
+ __be64 bb_leftsib;
+ __be64 bb_rightsib;
+
+ __be64 bb_blkno;
+ __be64 bb_lsn;
+ uuid_t bb_uuid;
+ __be64 bb_owner;
+ __le32 bb_crc;
+ __be32 bb_pad; /* padding for alignment */
+};
+
struct xfs_btree_block {
__be32 bb_magic; /* magic number for block type */
__be16 bb_level; /* 0 is a leaf */
__be16 bb_numrecs; /* current # of data records */
union {
- struct {
- __be32 bb_leftsib;
- __be32 bb_rightsib;
-
- __be64 bb_blkno;
- __be64 bb_lsn;
- uuid_t bb_uuid;
- __be32 bb_owner;
- __le32 bb_crc;
- } s; /* short form pointers */
- struct {
- __be64 bb_leftsib;
- __be64 bb_rightsib;
-
- __be64 bb_blkno;
- __be64 bb_lsn;
- uuid_t bb_uuid;
- __be64 bb_owner;
- __le32 bb_crc;
- __be32 bb_pad; /* padding for alignment */
- } l; /* long form pointers */
+ struct xfs_btree_block_shdr s;
+ struct xfs_btree_block_lhdr l;
} bb_u; /* rest */
};
-#define XFS_BTREE_SBLOCK_LEN 16 /* size of a short form block */
-#define XFS_BTREE_LBLOCK_LEN 24 /* size of a long form block */
+/* size of a short form block */
+#define XFS_BTREE_SBLOCK_LEN \
+ (offsetof(struct xfs_btree_block, bb_u) + \
+ offsetof(struct xfs_btree_block_shdr, bb_blkno))
+/* size of a long form block */
+#define XFS_BTREE_LBLOCK_LEN \
+ (offsetof(struct xfs_btree_block, bb_u) + \
+ offsetof(struct xfs_btree_block_lhdr, bb_blkno))
/* sizes of CRC enabled btree blocks */
-#define XFS_BTREE_SBLOCK_CRC_LEN (XFS_BTREE_SBLOCK_LEN + 40)
-#define XFS_BTREE_LBLOCK_CRC_LEN (XFS_BTREE_LBLOCK_LEN + 48)
+#define XFS_BTREE_SBLOCK_CRC_LEN \
+ (offsetof(struct xfs_btree_block, bb_u) + \
+ sizeof(struct xfs_btree_block_shdr))
+#define XFS_BTREE_LBLOCK_CRC_LEN \
+ (offsetof(struct xfs_btree_block, bb_u) + \
+ sizeof(struct xfs_btree_block_lhdr))
#define XFS_BTREE_SBLOCK_CRC_OFF \
offsetof(struct xfs_btree_block, bb_u.s.bb_crc)
diff --git a/fs/xfs/libxfs/xfs_fs.h b/fs/xfs/libxfs/xfs_fs.h
index fffe3d01bd9fb5c771a4919edee1c9f615ab49e2..f5ec9c5ccae6ace2873c0f1c44db1816baf0847b 100644
--- a/fs/xfs/libxfs/xfs_fs.h
+++ b/fs/xfs/libxfs/xfs_fs.h
@@ -521,12 +521,8 @@ typedef struct xfs_swapext
#define XFS_IOC_ERROR_CLEARALL _IOW ('X', 117, struct xfs_error_injection)
/* XFS_IOC_ATTRCTL_BY_HANDLE -- deprecated 118 */
-/* XFS_IOC_FREEZE -- FIFREEZE 119 */
-/* XFS_IOC_THAW -- FITHAW 120 */
-#ifndef FIFREEZE
-#define XFS_IOC_FREEZE _IOWR('X', 119, int)
-#define XFS_IOC_THAW _IOWR('X', 120, int)
-#endif
+#define XFS_IOC_FREEZE _IOWR('X', 119, int) /* aka FIFREEZE */
+#define XFS_IOC_THAW _IOWR('X', 120, int) /* aka FITHAW */
#define XFS_IOC_FSSETDM_BY_HANDLE _IOW ('X', 121, struct xfs_fsop_setdm_handlereq)
#define XFS_IOC_ATTRLIST_BY_HANDLE _IOW ('X', 122, struct xfs_fsop_attrlist_handlereq)
diff --git a/fs/xfs/libxfs/xfs_ialloc.c b/fs/xfs/libxfs/xfs_ialloc.c
index 22297f9b0fd52c8a6d3cc75bb0ac699bd985b0f0..4b1e408169a83de0c03825a8167bc8a678dd7124 100644
--- a/fs/xfs/libxfs/xfs_ialloc.c
+++ b/fs/xfs/libxfs/xfs_ialloc.c
@@ -1828,9 +1828,8 @@ xfs_difree_inode_chunk(
if (!xfs_inobt_issparse(rec->ir_holemask)) {
/* not sparse, calculate extent info directly */
- xfs_bmap_add_free(XFS_AGB_TO_FSB(mp, agno,
- XFS_AGINO_TO_AGBNO(mp, rec->ir_startino)),
- mp->m_ialloc_blks, flist, mp);
+ xfs_bmap_add_free(mp, flist, XFS_AGB_TO_FSB(mp, agno, sagbno),
+ mp->m_ialloc_blks);
return;
}
@@ -1873,8 +1872,8 @@ xfs_difree_inode_chunk(
ASSERT(agbno % mp->m_sb.sb_spino_align == 0);
ASSERT(contigblk % mp->m_sb.sb_spino_align == 0);
- xfs_bmap_add_free(XFS_AGB_TO_FSB(mp, agno, agbno), contigblk,
- flist, mp);
+ xfs_bmap_add_free(mp, flist, XFS_AGB_TO_FSB(mp, agno, agbno),
+ contigblk);
/* reset range to current bit and carry on... */
startidx = endidx = nextbit;
@@ -2395,20 +2394,11 @@ void
xfs_ialloc_compute_maxlevels(
xfs_mount_t *mp) /* file system mount structure */
{
- int level;
- uint maxblocks;
- uint maxleafents;
- int minleafrecs;
- int minnoderecs;
-
- maxleafents = (1LL << XFS_INO_AGINO_BITS(mp)) >>
- XFS_INODES_PER_CHUNK_LOG;
- minleafrecs = mp->m_inobt_mnr[0];
- minnoderecs = mp->m_inobt_mnr[1];
- maxblocks = (maxleafents + minleafrecs - 1) / minleafrecs;
- for (level = 1; maxblocks > 1; level++)
- maxblocks = (maxblocks + minnoderecs - 1) / minnoderecs;
- mp->m_in_maxlevels = level;
+ uint inodes;
+
+ inodes = (1LL << XFS_INO_AGINO_BITS(mp)) >> XFS_INODES_PER_CHUNK_LOG;
+ mp->m_in_maxlevels = xfs_btree_compute_maxlevels(mp, mp->m_inobt_mnr,
+ inodes);
}
/*
diff --git a/fs/xfs/libxfs/xfs_rtbitmap.c b/fs/xfs/libxfs/xfs_rtbitmap.c
index 951c044e24e40d024e5abf48057c0f0942111acc..e2e1106c9fadc91d41ab235904409b5428d7a83c 100644
--- a/fs/xfs/libxfs/xfs_rtbitmap.c
+++ b/fs/xfs/libxfs/xfs_rtbitmap.c
@@ -70,7 +70,7 @@ const struct xfs_buf_ops xfs_rtbuf_ops = {
* Get a buffer for the bitmap or summary file block specified.
* The buffer is returned read and locked.
*/
-int
+static int
xfs_rtbuf_get(
xfs_mount_t *mp, /* file system mount structure */
xfs_trans_t *tp, /* transaction pointer */
diff --git a/fs/xfs/xfs_aops.c b/fs/xfs/xfs_aops.c
index 87d2b215cbbd665d1d0f60bebae34e294e5f617a..7575cfc3ad15671b7b6242a241cca2c54b7d111d 100644
--- a/fs/xfs/xfs_aops.c
+++ b/fs/xfs/xfs_aops.c
@@ -87,6 +87,12 @@ xfs_find_bdev_for_inode(
* We're now finished for good with this page. Update the page state via the
* associated buffer_heads, paying attention to the start and end offsets that
* we need to process on the page.
+ *
+ * Landmine Warning: bh->b_end_io() will call end_page_writeback() on the last
+ * buffer in the IO. Once it does this, it is unsafe to access the bufferhead or
+ * the page at all, as we may be racing with memory reclaim and it can free both
+ * the bufferhead chain and the page as it will see the page as clean and
+ * unused.
*/
static void
xfs_finish_page_writeback(
@@ -95,8 +101,9 @@ xfs_finish_page_writeback(
int error)
{
unsigned int end = bvec->bv_offset + bvec->bv_len - 1;
- struct buffer_head *head, *bh;
+ struct buffer_head *head, *bh, *next;
unsigned int off = 0;
+ unsigned int bsize;
ASSERT(bvec->bv_offset < PAGE_SIZE);
ASSERT((bvec->bv_offset & ((1 << inode->i_blkbits) - 1)) == 0);
@@ -105,15 +112,17 @@ xfs_finish_page_writeback(
bh = head = page_buffers(bvec->bv_page);
+ bsize = bh->b_size;
do {
+ next = bh->b_this_page;
if (off < bvec->bv_offset)
goto next_bh;
if (off > end)
break;
bh->b_end_io(bh, !error);
next_bh:
- off += bh->b_size;
- } while ((bh = bh->b_this_page) != head);
+ off += bsize;
+ } while ((bh = next) != head);
}
/*
@@ -1041,6 +1050,20 @@ xfs_vm_releasepage(
trace_xfs_releasepage(page->mapping->host, page, 0, 0);
+ /*
+ * mm accommodates an old ext3 case where clean pages might not have had
+ * the dirty bit cleared. Thus, it can send actual dirty pages to
+ * ->releasepage() via shrink_active_list(). Conversely,
+ * block_invalidatepage() can send pages that are still marked dirty
+ * but otherwise have invalidated buffers.
+ *
+ * We've historically freed buffers on the latter. Instead, quietly
+ * filter out all dirty pages to avoid spurious buffer state warnings.
+ * This can likely be removed once shrink_active_list() is fixed.
+ */
+ if (PageDirty(page))
+ return 0;
+
xfs_count_page_state(page, &delalloc, &unwritten);
if (WARN_ON_ONCE(delalloc))
@@ -1144,6 +1167,8 @@ __xfs_get_blocks(
ssize_t size;
int new = 0;
+ BUG_ON(create && !direct);
+
if (XFS_FORCED_SHUTDOWN(mp))
return -EIO;
@@ -1151,22 +1176,14 @@ __xfs_get_blocks(
ASSERT(bh_result->b_size >= (1 << inode->i_blkbits));
size = bh_result->b_size;
- if (!create && direct && offset >= i_size_read(inode))
+ if (!create && offset >= i_size_read(inode))
return 0;
/*
* Direct I/O is usually done on preallocated files, so try getting
- * a block mapping without an exclusive lock first. For buffered
- * writes we already have the exclusive iolock anyway, so avoiding
- * a lock roundtrip here by taking the ilock exclusive from the
- * beginning is a useful micro optimization.
+ * a block mapping without an exclusive lock first.
*/
- if (create && !direct) {
- lockmode = XFS_ILOCK_EXCL;
- xfs_ilock(ip, lockmode);
- } else {
- lockmode = xfs_ilock_data_map_shared(ip);
- }
+ lockmode = xfs_ilock_data_map_shared(ip);
ASSERT(offset <= mp->m_super->s_maxbytes);
if (offset + size > mp->m_super->s_maxbytes)
@@ -1185,37 +1202,19 @@ __xfs_get_blocks(
(imap.br_startblock == HOLESTARTBLOCK ||
imap.br_startblock == DELAYSTARTBLOCK) ||
(IS_DAX(inode) && ISUNWRITTEN(&imap)))) {
- if (direct || xfs_get_extsz_hint(ip)) {
- /*
- * xfs_iomap_write_direct() expects the shared lock. It
- * is unlocked on return.
- */
- if (lockmode == XFS_ILOCK_EXCL)
- xfs_ilock_demote(ip, lockmode);
-
- error = xfs_iomap_write_direct(ip, offset, size,
- &imap, nimaps);
- if (error)
- return error;
- new = 1;
+ /*
+ * xfs_iomap_write_direct() expects the shared lock. It
+ * is unlocked on return.
+ */
+ if (lockmode == XFS_ILOCK_EXCL)
+ xfs_ilock_demote(ip, lockmode);
- } else {
- /*
- * Delalloc reservations do not require a transaction,
- * we can go on without dropping the lock here. If we
- * are allocating a new delalloc block, make sure that
- * we set the new flag so that we mark the buffer new so
- * that we know that it is newly allocated if the write
- * fails.
- */
- if (nimaps && imap.br_startblock == HOLESTARTBLOCK)
- new = 1;
- error = xfs_iomap_write_delay(ip, offset, size, &imap);
- if (error)
- goto out_unlock;
+ error = xfs_iomap_write_direct(ip, offset, size,
+ &imap, nimaps);
+ if (error)
+ return error;
+ new = 1;
- xfs_iunlock(ip, lockmode);
- }
trace_xfs_get_blocks_alloc(ip, offset, size,
ISUNWRITTEN(&imap) ? XFS_IO_UNWRITTEN
: XFS_IO_DELALLOC, &imap);
@@ -1236,9 +1235,7 @@ __xfs_get_blocks(
}
/* trim mapping down to size requested */
- if (direct || size > (1 << inode->i_blkbits))
- xfs_map_trim_size(inode, iblock, bh_result,
- &imap, offset, size);
+ xfs_map_trim_size(inode, iblock, bh_result, &imap, offset, size);
/*
* For unwritten extents do not report a disk address in the buffered
@@ -1251,7 +1248,7 @@ __xfs_get_blocks(
if (ISUNWRITTEN(&imap))
set_buffer_unwritten(bh_result);
/* direct IO needs special help */
- if (create && direct) {
+ if (create) {
if (dax_fault)
ASSERT(!ISUNWRITTEN(&imap));
else
@@ -1280,14 +1277,7 @@ __xfs_get_blocks(
(new || ISUNWRITTEN(&imap))))
set_buffer_new(bh_result);
- if (imap.br_startblock == DELAYSTARTBLOCK) {
- BUG_ON(direct);
- if (create) {
- set_buffer_uptodate(bh_result);
- set_buffer_mapped(bh_result);
- set_buffer_delay(bh_result);
- }
- }
+ BUG_ON(direct && imap.br_startblock == DELAYSTARTBLOCK);
return 0;
@@ -1337,7 +1327,7 @@ xfs_get_blocks_dax_fault(
* whereas if we have flags set we will always be called in task context
* (i.e. from a workqueue).
*/
-STATIC int
+int
xfs_end_io_direct_write(
struct kiocb *iocb,
loff_t offset,
@@ -1408,234 +1398,10 @@ xfs_vm_direct_IO(
struct kiocb *iocb,
struct iov_iter *iter)
{
- struct inode *inode = iocb->ki_filp->f_mapping->host;
- dio_iodone_t *endio = NULL;
- int flags = 0;
- struct block_device *bdev;
-
- if (iov_iter_rw(iter) == WRITE) {
- endio = xfs_end_io_direct_write;
- flags = DIO_ASYNC_EXTEND;
- }
-
- if (IS_DAX(inode)) {
- return dax_do_io(iocb, inode, iter,
- xfs_get_blocks_direct, endio, 0);
- }
-
- bdev = xfs_find_bdev_for_inode(inode);
- return __blockdev_direct_IO(iocb, inode, bdev, iter,
- xfs_get_blocks_direct, endio, NULL, flags);
-}
-
-/*
- * Punch out the delalloc blocks we have already allocated.
- *
- * Don't bother with xfs_setattr given that nothing can have made it to disk yet
- * as the page is still locked at this point.
- */
-STATIC void
-xfs_vm_kill_delalloc_range(
- struct inode *inode,
- loff_t start,
- loff_t end)
-{
- struct xfs_inode *ip = XFS_I(inode);
- xfs_fileoff_t start_fsb;
- xfs_fileoff_t end_fsb;
- int error;
-
- start_fsb = XFS_B_TO_FSB(ip->i_mount, start);
- end_fsb = XFS_B_TO_FSB(ip->i_mount, end);
- if (end_fsb <= start_fsb)
- return;
-
- xfs_ilock(ip, XFS_ILOCK_EXCL);
- error = xfs_bmap_punch_delalloc_range(ip, start_fsb,
- end_fsb - start_fsb);
- if (error) {
- /* something screwed, just bail */
- if (!XFS_FORCED_SHUTDOWN(ip->i_mount)) {
- xfs_alert(ip->i_mount,
- "xfs_vm_write_failed: unable to clean up ino %lld",
- ip->i_ino);
- }
- }
- xfs_iunlock(ip, XFS_ILOCK_EXCL);
-}
-
-STATIC void
-xfs_vm_write_failed(
- struct inode *inode,
- struct page *page,
- loff_t pos,
- unsigned len)
-{
- loff_t block_offset;
- loff_t block_start;
- loff_t block_end;
- loff_t from = pos & (PAGE_SIZE - 1);
- loff_t to = from + len;
- struct buffer_head *bh, *head;
- struct xfs_mount *mp = XFS_I(inode)->i_mount;
-
/*
- * The request pos offset might be 32 or 64 bit, this is all fine
- * on 64-bit platform. However, for 64-bit pos request on 32-bit
- * platform, the high 32-bit will be masked off if we evaluate the
- * block_offset via (pos & PAGE_MASK) because the PAGE_MASK is
- * 0xfffff000 as an unsigned long, hence the result is incorrect
- * which could cause the following ASSERT failed in most cases.
- * In order to avoid this, we can evaluate the block_offset of the
- * start of the page by using shifts rather than masks the mismatch
- * problem.
+ * We just need the method present so that open/fcntl allow direct I/O.
*/
- block_offset = (pos >> PAGE_SHIFT) << PAGE_SHIFT;
-
- ASSERT(block_offset + from == pos);
-
- head = page_buffers(page);
- block_start = 0;
- for (bh = head; bh != head || !block_start;
- bh = bh->b_this_page, block_start = block_end,
- block_offset += bh->b_size) {
- block_end = block_start + bh->b_size;
-
- /* skip buffers before the write */
- if (block_end <= from)
- continue;
-
- /* if the buffer is after the write, we're done */
- if (block_start >= to)
- break;
-
- /*
- * Process delalloc and unwritten buffers beyond EOF. We can
- * encounter unwritten buffers in the event that a file has
- * post-EOF unwritten extents and an extending write happens to
- * fail (e.g., an unaligned write that also involves a delalloc
- * to the same page).
- */
- if (!buffer_delay(bh) && !buffer_unwritten(bh))
- continue;
-
- if (!xfs_mp_fail_writes(mp) && !buffer_new(bh) &&
- block_offset < i_size_read(inode))
- continue;
-
- if (buffer_delay(bh))
- xfs_vm_kill_delalloc_range(inode, block_offset,
- block_offset + bh->b_size);
-
- /*
- * This buffer does not contain data anymore. make sure anyone
- * who finds it knows that for certain.
- */
- clear_buffer_delay(bh);
- clear_buffer_uptodate(bh);
- clear_buffer_mapped(bh);
- clear_buffer_new(bh);
- clear_buffer_dirty(bh);
- clear_buffer_unwritten(bh);
- }
-
-}
-
-/*
- * This used to call block_write_begin(), but it unlocks and releases the page
- * on error, and we need that page to be able to punch stale delalloc blocks out
- * on failure. hence we copy-n-waste it here and call xfs_vm_write_failed() at
- * the appropriate point.
- */
-STATIC int
-xfs_vm_write_begin(
- struct file *file,
- struct address_space *mapping,
- loff_t pos,
- unsigned len,
- unsigned flags,
- struct page **pagep,
- void **fsdata)
-{
- pgoff_t index = pos >> PAGE_SHIFT;
- struct page *page;
- int status;
- struct xfs_mount *mp = XFS_I(mapping->host)->i_mount;
-
- ASSERT(len <= PAGE_SIZE);
-
- page = grab_cache_page_write_begin(mapping, index, flags);
- if (!page)
- return -ENOMEM;
-
- status = __block_write_begin(page, pos, len, xfs_get_blocks);
- if (xfs_mp_fail_writes(mp))
- status = -EIO;
- if (unlikely(status)) {
- struct inode *inode = mapping->host;
- size_t isize = i_size_read(inode);
-
- xfs_vm_write_failed(inode, page, pos, len);
- unlock_page(page);
-
- /*
- * If the write is beyond EOF, we only want to kill blocks
- * allocated in this write, not blocks that were previously
- * written successfully.
- */
- if (xfs_mp_fail_writes(mp))
- isize = 0;
- if (pos + len > isize) {
- ssize_t start = max_t(ssize_t, pos, isize);
-
- truncate_pagecache_range(inode, start, pos + len);
- }
-
- put_page(page);
- page = NULL;
- }
-
- *pagep = page;
- return status;
-}
-
-/*
- * On failure, we only need to kill delalloc blocks beyond EOF in the range of
- * this specific write because they will never be written. Previous writes
- * beyond EOF where block allocation succeeded do not need to be trashed, so
- * only new blocks from this write should be trashed. For blocks within
- * EOF, generic_write_end() zeros them so they are safe to leave alone and be
- * written with all the other valid data.
- */
-STATIC int
-xfs_vm_write_end(
- struct file *file,
- struct address_space *mapping,
- loff_t pos,
- unsigned len,
- unsigned copied,
- struct page *page,
- void *fsdata)
-{
- int ret;
-
- ASSERT(len <= PAGE_SIZE);
-
- ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata);
- if (unlikely(ret < len)) {
- struct inode *inode = mapping->host;
- size_t isize = i_size_read(inode);
- loff_t to = pos + len;
-
- if (to > isize) {
- /* only kill blocks in this write beyond EOF */
- if (pos > isize)
- isize = pos;
- xfs_vm_kill_delalloc_range(inode, isize, to);
- truncate_pagecache_range(inode, isize, to);
- }
- }
- return ret;
+ return -EINVAL;
}
STATIC sector_t
@@ -1748,8 +1514,6 @@ const struct address_space_operations xfs_address_space_operations = {
.set_page_dirty = xfs_vm_set_page_dirty,
.releasepage = xfs_vm_releasepage,
.invalidatepage = xfs_vm_invalidatepage,
- .write_begin = xfs_vm_write_begin,
- .write_end = xfs_vm_write_end,
.bmap = xfs_vm_bmap,
.direct_IO = xfs_vm_direct_IO,
.migratepage = buffer_migrate_page,
diff --git a/fs/xfs/xfs_aops.h b/fs/xfs/xfs_aops.h
index 814aab7907134e14cbc3ccb7f72d14001a7834d1..bf2d9a141a734bc8b33fde55e9a3d51e30f37e64 100644
--- a/fs/xfs/xfs_aops.h
+++ b/fs/xfs/xfs_aops.h
@@ -60,6 +60,9 @@ int xfs_get_blocks_direct(struct inode *inode, sector_t offset,
int xfs_get_blocks_dax_fault(struct inode *inode, sector_t offset,
struct buffer_head *map_bh, int create);
+int xfs_end_io_direct_write(struct kiocb *iocb, loff_t offset,
+ ssize_t size, void *private);
+
extern void xfs_count_page_state(struct page *, int *, int *);
extern struct block_device *xfs_find_bdev_for_inode(struct inode *);
diff --git a/fs/xfs/xfs_attr_inactive.c b/fs/xfs/xfs_attr_inactive.c
index 55d214981ed27e6bb85490767939d25058815201..be0b79d8900f0f4fb9cb29fff6c2ccb2cca38f55 100644
--- a/fs/xfs/xfs_attr_inactive.c
+++ b/fs/xfs/xfs_attr_inactive.c
@@ -322,7 +322,7 @@ xfs_attr3_node_inactive(
* Recurse (gasp!) through the attribute nodes until we find leaves.
* We're doing a depth-first traversal in order to invalidate everything.
*/
-int
+static int
xfs_attr3_root_inactive(
struct xfs_trans **trans,
struct xfs_inode *dp)
diff --git a/fs/xfs/xfs_attr_list.c b/fs/xfs/xfs_attr_list.c
index d25f26b22ac92821cb2dbc95973e0c1804cebe10..25e76cd6c0533654f36dfe579145322a4f571cd9 100644
--- a/fs/xfs/xfs_attr_list.c
+++ b/fs/xfs/xfs_attr_list.c
@@ -65,7 +65,7 @@ xfs_attr_shortform_compare(const void *a, const void *b)
* we have to calculate each entries' hashvalue and sort them before
* we can begin returning them to the user.
*/
-int
+static int
xfs_attr_shortform_list(xfs_attr_list_context_t *context)
{
attrlist_cursor_kern_t *cursor;
diff --git a/fs/xfs/xfs_bmap_util.c b/fs/xfs/xfs_bmap_util.c
index 586bb64e674bac152c54e7de2255400c7e00e965..cd4a850564f2a7d7f48d75c4c6b59f0f2994932e 100644
--- a/fs/xfs/xfs_bmap_util.c
+++ b/fs/xfs/xfs_bmap_util.c
@@ -79,6 +79,23 @@ xfs_zero_extent(
GFP_NOFS, true);
}
+/* Sort bmap items by AG. */
+static int
+xfs_bmap_free_list_cmp(
+ void *priv,
+ struct list_head *a,
+ struct list_head *b)
+{
+ struct xfs_mount *mp = priv;
+ struct xfs_bmap_free_item *ra;
+ struct xfs_bmap_free_item *rb;
+
+ ra = container_of(a, struct xfs_bmap_free_item, xbfi_list);
+ rb = container_of(b, struct xfs_bmap_free_item, xbfi_list);
+ return XFS_FSB_TO_AGNO(mp, ra->xbfi_startblock) -
+ XFS_FSB_TO_AGNO(mp, rb->xbfi_startblock);
+}
+
/*
* Routine to be called at transaction's end by xfs_bmapi, xfs_bunmapi
* caller. Frees all the extents that need freeing, which must be done
@@ -99,14 +116,15 @@ xfs_bmap_finish(
int error; /* error return value */
int committed;/* xact committed or not */
struct xfs_bmap_free_item *free; /* free extent item */
- struct xfs_bmap_free_item *next; /* next item on free list */
ASSERT((*tp)->t_flags & XFS_TRANS_PERM_LOG_RES);
if (flist->xbf_count == 0)
return 0;
+ list_sort((*tp)->t_mountp, &flist->xbf_flist, xfs_bmap_free_list_cmp);
+
efi = xfs_trans_get_efi(*tp, flist->xbf_count);
- for (free = flist->xbf_first; free; free = free->xbfi_next)
+ list_for_each_entry(free, &flist->xbf_flist, xbfi_list)
xfs_trans_log_efi_extent(*tp, efi, free->xbfi_startblock,
free->xbfi_blockcount);
@@ -125,9 +143,7 @@ xfs_bmap_finish(
if (committed) {
xfs_efi_release(efi);
xfs_force_shutdown((*tp)->t_mountp,
- (error == -EFSCORRUPTED) ?
- SHUTDOWN_CORRUPT_INCORE :
- SHUTDOWN_META_IO_ERROR);
+ SHUTDOWN_META_IO_ERROR);
}
return error;
}
@@ -138,15 +154,15 @@ xfs_bmap_finish(
* on error.
*/
efd = xfs_trans_get_efd(*tp, efi, flist->xbf_count);
- for (free = flist->xbf_first; free != NULL; free = next) {
- next = free->xbfi_next;
-
+ while (!list_empty(&flist->xbf_flist)) {
+ free = list_first_entry(&flist->xbf_flist,
+ struct xfs_bmap_free_item, xbfi_list);
error = xfs_trans_free_extent(*tp, efd, free->xbfi_startblock,
free->xbfi_blockcount);
if (error)
return error;
- xfs_bmap_del_free(flist, NULL, free);
+ xfs_bmap_del_free(flist, free);
}
return 0;
@@ -409,7 +425,7 @@ xfs_bmap_count_tree(
/*
* Count fsblocks of the given fork.
*/
-int /* error */
+static int /* error */
xfs_bmap_count_blocks(
xfs_trans_t *tp, /* transaction pointer */
xfs_inode_t *ip, /* incore inode */
@@ -799,7 +815,7 @@ xfs_bmap_punch_delalloc_range(
if (error)
break;
- ASSERT(!flist.xbf_count && !flist.xbf_first);
+ ASSERT(!flist.xbf_count && list_empty(&flist.xbf_flist));
next_block:
start_fsb++;
remaining--;
@@ -1089,99 +1105,120 @@ xfs_alloc_file_space(
return error;
}
-/*
- * Zero file bytes between startoff and endoff inclusive.
- * The iolock is held exclusive and no blocks are buffered.
- *
- * This function is used by xfs_free_file_space() to zero
- * partial blocks when the range to free is not block aligned.
- * When unreserving space with boundaries that are not block
- * aligned we round up the start and round down the end
- * boundaries and then use this function to zero the parts of
- * the blocks that got dropped during the rounding.
- */
-STATIC int
-xfs_zero_remaining_bytes(
- xfs_inode_t *ip,
- xfs_off_t startoff,
- xfs_off_t endoff)
+static int
+xfs_unmap_extent(
+ struct xfs_inode *ip,
+ xfs_fileoff_t startoffset_fsb,
+ xfs_filblks_t len_fsb,
+ int *done)
{
- xfs_bmbt_irec_t imap;
- xfs_fileoff_t offset_fsb;
- xfs_off_t lastoffset;
- xfs_off_t offset;
- xfs_buf_t *bp;
- xfs_mount_t *mp = ip->i_mount;
- int nimap;
- int error = 0;
+ struct xfs_mount *mp = ip->i_mount;
+ struct xfs_trans *tp;
+ struct xfs_bmap_free free_list;
+ xfs_fsblock_t firstfsb;
+ uint resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
+ int error;
- /*
- * Avoid doing I/O beyond eof - it's not necessary
- * since nothing can read beyond eof. The space will
- * be zeroed when the file is extended anyway.
- */
- if (startoff >= XFS_ISIZE(ip))
- return 0;
+ error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, resblks, 0, 0, &tp);
+ if (error) {
+ ASSERT(error == -ENOSPC || XFS_FORCED_SHUTDOWN(mp));
+ return error;
+ }
- if (endoff > XFS_ISIZE(ip))
- endoff = XFS_ISIZE(ip);
+ xfs_ilock(ip, XFS_ILOCK_EXCL);
+ error = xfs_trans_reserve_quota(tp, mp, ip->i_udquot, ip->i_gdquot,
+ ip->i_pdquot, resblks, 0, XFS_QMOPT_RES_REGBLKS);
+ if (error)
+ goto out_trans_cancel;
- for (offset = startoff; offset <= endoff; offset = lastoffset + 1) {
- uint lock_mode;
+ xfs_trans_ijoin(tp, ip, 0);
- offset_fsb = XFS_B_TO_FSBT(mp, offset);
- nimap = 1;
+ xfs_bmap_init(&free_list, &firstfsb);
+ error = xfs_bunmapi(tp, ip, startoffset_fsb, len_fsb, 0, 2, &firstfsb,
+ &free_list, done);
+ if (error)
+ goto out_bmap_cancel;
- lock_mode = xfs_ilock_data_map_shared(ip);
- error = xfs_bmapi_read(ip, offset_fsb, 1, &imap, &nimap, 0);
- xfs_iunlock(ip, lock_mode);
+ error = xfs_bmap_finish(&tp, &free_list, NULL);
+ if (error)
+ goto out_bmap_cancel;
- if (error || nimap < 1)
- break;
- ASSERT(imap.br_blockcount >= 1);
- ASSERT(imap.br_startoff == offset_fsb);
- ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
+ error = xfs_trans_commit(tp);
+out_unlock:
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ return error;
- if (imap.br_startblock == HOLESTARTBLOCK ||
- imap.br_state == XFS_EXT_UNWRITTEN) {
- /* skip the entire extent */
- lastoffset = XFS_FSB_TO_B(mp, imap.br_startoff +
- imap.br_blockcount) - 1;
- continue;
- }
+out_bmap_cancel:
+ xfs_bmap_cancel(&free_list);
+out_trans_cancel:
+ xfs_trans_cancel(tp);
+ goto out_unlock;
+}
- lastoffset = XFS_FSB_TO_B(mp, imap.br_startoff + 1) - 1;
- if (lastoffset > endoff)
- lastoffset = endoff;
+static int
+xfs_adjust_extent_unmap_boundaries(
+ struct xfs_inode *ip,
+ xfs_fileoff_t *startoffset_fsb,
+ xfs_fileoff_t *endoffset_fsb)
+{
+ struct xfs_mount *mp = ip->i_mount;
+ struct xfs_bmbt_irec imap;
+ int nimap, error;
+ xfs_extlen_t mod = 0;
- /* DAX can just zero the backing device directly */
- if (IS_DAX(VFS_I(ip))) {
- error = dax_zero_page_range(VFS_I(ip), offset,
- lastoffset - offset + 1,
- xfs_get_blocks_direct);
- if (error)
- return error;
- continue;
- }
+ nimap = 1;
+ error = xfs_bmapi_read(ip, *startoffset_fsb, 1, &imap, &nimap, 0);
+ if (error)
+ return error;
- error = xfs_buf_read_uncached(XFS_IS_REALTIME_INODE(ip) ?
- mp->m_rtdev_targp : mp->m_ddev_targp,
- xfs_fsb_to_db(ip, imap.br_startblock),
- BTOBB(mp->m_sb.sb_blocksize),
- 0, &bp, NULL);
- if (error)
- return error;
+ if (nimap && imap.br_startblock != HOLESTARTBLOCK) {
+ xfs_daddr_t block;
- memset(bp->b_addr +
- (offset - XFS_FSB_TO_B(mp, imap.br_startoff)),
- 0, lastoffset - offset + 1);
+ ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
+ block = imap.br_startblock;
+ mod = do_div(block, mp->m_sb.sb_rextsize);
+ if (mod)
+ *startoffset_fsb += mp->m_sb.sb_rextsize - mod;
+ }
- error = xfs_bwrite(bp);
- xfs_buf_relse(bp);
- if (error)
- return error;
+ nimap = 1;
+ error = xfs_bmapi_read(ip, *endoffset_fsb - 1, 1, &imap, &nimap, 0);
+ if (error)
+ return error;
+
+ if (nimap && imap.br_startblock != HOLESTARTBLOCK) {
+ ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
+ mod++;
+ if (mod && mod != mp->m_sb.sb_rextsize)
+ *endoffset_fsb -= mod;
}
- return error;
+
+ return 0;
+}
+
+static int
+xfs_flush_unmap_range(
+ struct xfs_inode *ip,
+ xfs_off_t offset,
+ xfs_off_t len)
+{
+ struct xfs_mount *mp = ip->i_mount;
+ struct inode *inode = VFS_I(ip);
+ xfs_off_t rounding, start, end;
+ int error;
+
+ /* wait for the completion of any pending DIOs */
+ inode_dio_wait(inode);
+
+ rounding = max_t(xfs_off_t, 1 << mp->m_sb.sb_blocklog, PAGE_SIZE);
+ start = round_down(offset, rounding);
+ end = round_up(offset + len, rounding) - 1;
+
+ error = filemap_write_and_wait_range(inode->i_mapping, start, end);
+ if (error)
+ return error;
+ truncate_pagecache_range(inode, start, end);
+ return 0;
}
int
@@ -1190,24 +1227,10 @@ xfs_free_file_space(
xfs_off_t offset,
xfs_off_t len)
{
- int done;
- xfs_fileoff_t endoffset_fsb;
- int error;
- xfs_fsblock_t firstfsb;
- xfs_bmap_free_t free_list;
- xfs_bmbt_irec_t imap;
- xfs_off_t ioffset;
- xfs_off_t iendoffset;
- xfs_extlen_t mod=0;
- xfs_mount_t *mp;
- int nimap;
- uint resblks;
- xfs_off_t rounding;
- int rt;
+ struct xfs_mount *mp = ip->i_mount;
xfs_fileoff_t startoffset_fsb;
- xfs_trans_t *tp;
-
- mp = ip->i_mount;
+ xfs_fileoff_t endoffset_fsb;
+ int done = 0, error;
trace_xfs_free_file_space(ip);
@@ -1215,135 +1238,45 @@ xfs_free_file_space(
if (error)
return error;
- error = 0;
if (len <= 0) /* if nothing being freed */
- return error;
- rt = XFS_IS_REALTIME_INODE(ip);
- startoffset_fsb = XFS_B_TO_FSB(mp, offset);
- endoffset_fsb = XFS_B_TO_FSBT(mp, offset + len);
-
- /* wait for the completion of any pending DIOs */
- inode_dio_wait(VFS_I(ip));
+ return 0;
- rounding = max_t(xfs_off_t, 1 << mp->m_sb.sb_blocklog, PAGE_SIZE);
- ioffset = round_down(offset, rounding);
- iendoffset = round_up(offset + len, rounding) - 1;
- error = filemap_write_and_wait_range(VFS_I(ip)->i_mapping, ioffset,
- iendoffset);
+ error = xfs_flush_unmap_range(ip, offset, len);
if (error)
- goto out;
- truncate_pagecache_range(VFS_I(ip), ioffset, iendoffset);
+ return error;
+
+ startoffset_fsb = XFS_B_TO_FSB(mp, offset);
+ endoffset_fsb = XFS_B_TO_FSBT(mp, offset + len);
/*
- * Need to zero the stuff we're not freeing, on disk.
- * If it's a realtime file & can't use unwritten extents then we
- * actually need to zero the extent edges. Otherwise xfs_bunmapi
- * will take care of it for us.
+ * Need to zero the stuff we're not freeing, on disk. If it's a RT file
+ * and we can't use unwritten extents then we actually need to ensure
+ * to zero the whole extent, otherwise we just need to take of block
+ * boundaries, and xfs_bunmapi will handle the rest.
*/
- if (rt && !xfs_sb_version_hasextflgbit(&mp->m_sb)) {
- nimap = 1;
- error = xfs_bmapi_read(ip, startoffset_fsb, 1,
- &imap, &nimap, 0);
- if (error)
- goto out;
- ASSERT(nimap == 0 || nimap == 1);
- if (nimap && imap.br_startblock != HOLESTARTBLOCK) {
- xfs_daddr_t block;
-
- ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
- block = imap.br_startblock;
- mod = do_div(block, mp->m_sb.sb_rextsize);
- if (mod)
- startoffset_fsb += mp->m_sb.sb_rextsize - mod;
- }
- nimap = 1;
- error = xfs_bmapi_read(ip, endoffset_fsb - 1, 1,
- &imap, &nimap, 0);
+ if (XFS_IS_REALTIME_INODE(ip) &&
+ !xfs_sb_version_hasextflgbit(&mp->m_sb)) {
+ error = xfs_adjust_extent_unmap_boundaries(ip, &startoffset_fsb,
+ &endoffset_fsb);
if (error)
- goto out;
- ASSERT(nimap == 0 || nimap == 1);
- if (nimap && imap.br_startblock != HOLESTARTBLOCK) {
- ASSERT(imap.br_startblock != DELAYSTARTBLOCK);
- mod++;
- if (mod && (mod != mp->m_sb.sb_rextsize))
- endoffset_fsb -= mod;
- }
- }
- if ((done = (endoffset_fsb <= startoffset_fsb)))
- /*
- * One contiguous piece to clear
- */
- error = xfs_zero_remaining_bytes(ip, offset, offset + len - 1);
- else {
- /*
- * Some full blocks, possibly two pieces to clear
- */
- if (offset < XFS_FSB_TO_B(mp, startoffset_fsb))
- error = xfs_zero_remaining_bytes(ip, offset,
- XFS_FSB_TO_B(mp, startoffset_fsb) - 1);
- if (!error &&
- XFS_FSB_TO_B(mp, endoffset_fsb) < offset + len)
- error = xfs_zero_remaining_bytes(ip,
- XFS_FSB_TO_B(mp, endoffset_fsb),
- offset + len - 1);
+ return error;
}
- /*
- * free file space until done or until there is an error
- */
- resblks = XFS_DIOSTRAT_SPACE_RES(mp, 0);
- while (!error && !done) {
-
- /*
- * allocate and setup the transaction. Allow this
- * transaction to dip into the reserve blocks to ensure
- * the freeing of the space succeeds at ENOSPC.
- */
- error = xfs_trans_alloc(mp, &M_RES(mp)->tr_write, resblks, 0, 0,
- &tp);
- if (error) {
- ASSERT(error == -ENOSPC || XFS_FORCED_SHUTDOWN(mp));
- break;
+ if (endoffset_fsb > startoffset_fsb) {
+ while (!done) {
+ error = xfs_unmap_extent(ip, startoffset_fsb,
+ endoffset_fsb - startoffset_fsb, &done);
+ if (error)
+ return error;
}
- xfs_ilock(ip, XFS_ILOCK_EXCL);
- error = xfs_trans_reserve_quota(tp, mp,
- ip->i_udquot, ip->i_gdquot, ip->i_pdquot,
- resblks, 0, XFS_QMOPT_RES_REGBLKS);
- if (error)
- goto error1;
-
- xfs_trans_ijoin(tp, ip, 0);
-
- /*
- * issue the bunmapi() call to free the blocks
- */
- xfs_bmap_init(&free_list, &firstfsb);
- error = xfs_bunmapi(tp, ip, startoffset_fsb,
- endoffset_fsb - startoffset_fsb,
- 0, 2, &firstfsb, &free_list, &done);
- if (error)
- goto error0;
-
- /*
- * complete the transaction
- */
- error = xfs_bmap_finish(&tp, &free_list, NULL);
- if (error)
- goto error0;
-
- error = xfs_trans_commit(tp);
- xfs_iunlock(ip, XFS_ILOCK_EXCL);
}
- out:
- return error;
-
- error0:
- xfs_bmap_cancel(&free_list);
- error1:
- xfs_trans_cancel(tp);
- xfs_iunlock(ip, XFS_ILOCK_EXCL);
- goto out;
+ /*
+ * Now that we've unmap all full blocks we'll have to zero out any
+ * partial block at the beginning and/or end. xfs_zero_range is
+ * smart enough to skip any holes, including those we just created.
+ */
+ return xfs_zero_range(ip, offset, len, NULL);
}
/*
diff --git a/fs/xfs/xfs_bmap_util.h b/fs/xfs/xfs_bmap_util.h
index af97d9a1dfb449230139891d53ff89a175fabbfc..f20071432ca6222e0d103ac8d4a54380e90565e0 100644
--- a/fs/xfs/xfs_bmap_util.h
+++ b/fs/xfs/xfs_bmap_util.h
@@ -31,8 +31,6 @@ struct xfs_bmalloca;
int xfs_bmap_rtalloc(struct xfs_bmalloca *ap);
int xfs_bmap_eof(struct xfs_inode *ip, xfs_fileoff_t endoff,
int whichfork, int *eof);
-int xfs_bmap_count_blocks(struct xfs_trans *tp, struct xfs_inode *ip,
- int whichfork, int *count);
int xfs_bmap_punch_delalloc_range(struct xfs_inode *ip,
xfs_fileoff_t start_fsb, xfs_fileoff_t length);
@@ -43,7 +41,6 @@ int xfs_getbmap(struct xfs_inode *ip, struct getbmapx *bmv,
/* functions in xfs_bmap.c that are only needed by xfs_bmap_util.c */
void xfs_bmap_del_free(struct xfs_bmap_free *flist,
- struct xfs_bmap_free_item *prev,
struct xfs_bmap_free_item *free);
int xfs_bmap_extsize_align(struct xfs_mount *mp, struct xfs_bmbt_irec *gotp,
struct xfs_bmbt_irec *prevp, xfs_extlen_t extsz,
diff --git a/fs/xfs/xfs_buf.c b/fs/xfs/xfs_buf.c
index a87a0d5477bdf89f18572b265bb62e4d982ead36..47a318ce82e0ab5828164e6604ffe9dd5f66a0d6 100644
--- a/fs/xfs/xfs_buf.c
+++ b/fs/xfs/xfs_buf.c
@@ -79,6 +79,47 @@ xfs_buf_vmap_len(
return (bp->b_page_count * PAGE_SIZE) - bp->b_offset;
}
+/*
+ * Bump the I/O in flight count on the buftarg if we haven't yet done so for
+ * this buffer. The count is incremented once per buffer (per hold cycle)
+ * because the corresponding decrement is deferred to buffer release. Buffers
+ * can undergo I/O multiple times in a hold-release cycle and per buffer I/O
+ * tracking adds unnecessary overhead. This is used for sychronization purposes
+ * with unmount (see xfs_wait_buftarg()), so all we really need is a count of
+ * in-flight buffers.
+ *
+ * Buffers that are never released (e.g., superblock, iclog buffers) must set
+ * the XBF_NO_IOACCT flag before I/O submission. Otherwise, the buftarg count
+ * never reaches zero and unmount hangs indefinitely.
+ */
+static inline void
+xfs_buf_ioacct_inc(
+ struct xfs_buf *bp)
+{
+ if (bp->b_flags & (XBF_NO_IOACCT|_XBF_IN_FLIGHT))
+ return;
+
+ ASSERT(bp->b_flags & XBF_ASYNC);
+ bp->b_flags |= _XBF_IN_FLIGHT;
+ percpu_counter_inc(&bp->b_target->bt_io_count);
+}
+
+/*
+ * Clear the in-flight state on a buffer about to be released to the LRU or
+ * freed and unaccount from the buftarg.
+ */
+static inline void
+xfs_buf_ioacct_dec(
+ struct xfs_buf *bp)
+{
+ if (!(bp->b_flags & _XBF_IN_FLIGHT))
+ return;
+
+ ASSERT(bp->b_flags & XBF_ASYNC);
+ bp->b_flags &= ~_XBF_IN_FLIGHT;
+ percpu_counter_dec(&bp->b_target->bt_io_count);
+}
+
/*
* When we mark a buffer stale, we remove the buffer from the LRU and clear the
* b_lru_ref count so that the buffer is freed immediately when the buffer
@@ -102,6 +143,14 @@ xfs_buf_stale(
*/
bp->b_flags &= ~_XBF_DELWRI_Q;
+ /*
+ * Once the buffer is marked stale and unlocked, a subsequent lookup
+ * could reset b_flags. There is no guarantee that the buffer is
+ * unaccounted (released to LRU) before that occurs. Drop in-flight
+ * status now to preserve accounting consistency.
+ */
+ xfs_buf_ioacct_dec(bp);
+
spin_lock(&bp->b_lock);
atomic_set(&bp->b_lru_ref, 0);
if (!(bp->b_state & XFS_BSTATE_DISPOSE) &&
@@ -815,7 +864,8 @@ xfs_buf_get_uncached(
struct xfs_buf *bp;
DEFINE_SINGLE_BUF_MAP(map, XFS_BUF_DADDR_NULL, numblks);
- bp = _xfs_buf_alloc(target, &map, 1, 0);
+ /* flags might contain irrelevant bits, pass only what we care about */
+ bp = _xfs_buf_alloc(target, &map, 1, flags & XBF_NO_IOACCT);
if (unlikely(bp == NULL))
goto fail;
@@ -866,63 +916,85 @@ xfs_buf_hold(
}
/*
- * Releases a hold on the specified buffer. If the
- * the hold count is 1, calls xfs_buf_free.
+ * Release a hold on the specified buffer. If the hold count is 1, the buffer is
+ * placed on LRU or freed (depending on b_lru_ref).
*/
void
xfs_buf_rele(
xfs_buf_t *bp)
{
struct xfs_perag *pag = bp->b_pag;
+ bool release;
+ bool freebuf = false;
trace_xfs_buf_rele(bp, _RET_IP_);
if (!pag) {
ASSERT(list_empty(&bp->b_lru));
ASSERT(RB_EMPTY_NODE(&bp->b_rbnode));
- if (atomic_dec_and_test(&bp->b_hold))
+ if (atomic_dec_and_test(&bp->b_hold)) {
+ xfs_buf_ioacct_dec(bp);
xfs_buf_free(bp);
+ }
return;
}
ASSERT(!RB_EMPTY_NODE(&bp->b_rbnode));
ASSERT(atomic_read(&bp->b_hold) > 0);
- if (atomic_dec_and_lock(&bp->b_hold, &pag->pag_buf_lock)) {
- spin_lock(&bp->b_lock);
- if (!(bp->b_flags & XBF_STALE) && atomic_read(&bp->b_lru_ref)) {
- /*
- * If the buffer is added to the LRU take a new
- * reference to the buffer for the LRU and clear the
- * (now stale) dispose list state flag
- */
- if (list_lru_add(&bp->b_target->bt_lru, &bp->b_lru)) {
- bp->b_state &= ~XFS_BSTATE_DISPOSE;
- atomic_inc(&bp->b_hold);
- }
- spin_unlock(&bp->b_lock);
- spin_unlock(&pag->pag_buf_lock);
- } else {
- /*
- * most of the time buffers will already be removed from
- * the LRU, so optimise that case by checking for the
- * XFS_BSTATE_DISPOSE flag indicating the last list the
- * buffer was on was the disposal list
- */
- if (!(bp->b_state & XFS_BSTATE_DISPOSE)) {
- list_lru_del(&bp->b_target->bt_lru, &bp->b_lru);
- } else {
- ASSERT(list_empty(&bp->b_lru));
- }
- spin_unlock(&bp->b_lock);
- ASSERT(!(bp->b_flags & _XBF_DELWRI_Q));
- rb_erase(&bp->b_rbnode, &pag->pag_buf_tree);
- spin_unlock(&pag->pag_buf_lock);
- xfs_perag_put(pag);
- xfs_buf_free(bp);
+ release = atomic_dec_and_lock(&bp->b_hold, &pag->pag_buf_lock);
+ spin_lock(&bp->b_lock);
+ if (!release) {
+ /*
+ * Drop the in-flight state if the buffer is already on the LRU
+ * and it holds the only reference. This is racy because we
+ * haven't acquired the pag lock, but the use of _XBF_IN_FLIGHT
+ * ensures the decrement occurs only once per-buf.
+ */
+ if ((atomic_read(&bp->b_hold) == 1) && !list_empty(&bp->b_lru))
+ xfs_buf_ioacct_dec(bp);
+ goto out_unlock;
+ }
+
+ /* the last reference has been dropped ... */
+ xfs_buf_ioacct_dec(bp);
+ if (!(bp->b_flags & XBF_STALE) && atomic_read(&bp->b_lru_ref)) {
+ /*
+ * If the buffer is added to the LRU take a new reference to the
+ * buffer for the LRU and clear the (now stale) dispose list
+ * state flag
+ */
+ if (list_lru_add(&bp->b_target->bt_lru, &bp->b_lru)) {
+ bp->b_state &= ~XFS_BSTATE_DISPOSE;
+ atomic_inc(&bp->b_hold);
+ }
+ spin_unlock(&pag->pag_buf_lock);
+ } else {
+ /*
+ * most of the time buffers will already be removed from the
+ * LRU, so optimise that case by checking for the
+ * XFS_BSTATE_DISPOSE flag indicating the last list the buffer
+ * was on was the disposal list
+ */
+ if (!(bp->b_state & XFS_BSTATE_DISPOSE)) {
+ list_lru_del(&bp->b_target->bt_lru, &bp->b_lru);
+ } else {
+ ASSERT(list_empty(&bp->b_lru));
}
+
+ ASSERT(!(bp->b_flags & _XBF_DELWRI_Q));
+ rb_erase(&bp->b_rbnode, &pag->pag_buf_tree);
+ spin_unlock(&pag->pag_buf_lock);
+ xfs_perag_put(pag);
+ freebuf = true;
}
+
+out_unlock:
+ spin_unlock(&bp->b_lock);
+
+ if (freebuf)
+ xfs_buf_free(bp);
}
@@ -944,10 +1016,12 @@ xfs_buf_trylock(
int locked;
locked = down_trylock(&bp->b_sema) == 0;
- if (locked)
+ if (locked) {
XB_SET_OWNER(bp);
-
- trace_xfs_buf_trylock(bp, _RET_IP_);
+ trace_xfs_buf_trylock(bp, _RET_IP_);
+ } else {
+ trace_xfs_buf_trylock_fail(bp, _RET_IP_);
+ }
return locked;
}
@@ -1339,6 +1413,7 @@ xfs_buf_submit(
* xfs_buf_ioend too early.
*/
atomic_set(&bp->b_io_remaining, 1);
+ xfs_buf_ioacct_inc(bp);
_xfs_buf_ioapply(bp);
/*
@@ -1524,13 +1599,19 @@ xfs_wait_buftarg(
int loop = 0;
/*
- * We need to flush the buffer workqueue to ensure that all IO
- * completion processing is 100% done. Just waiting on buffer locks is
- * not sufficient for async IO as the reference count held over IO is
- * not released until after the buffer lock is dropped. Hence we need to
- * ensure here that all reference counts have been dropped before we
- * start walking the LRU list.
+ * First wait on the buftarg I/O count for all in-flight buffers to be
+ * released. This is critical as new buffers do not make the LRU until
+ * they are released.
+ *
+ * Next, flush the buffer workqueue to ensure all completion processing
+ * has finished. Just waiting on buffer locks is not sufficient for
+ * async IO as the reference count held over IO is not released until
+ * after the buffer lock is dropped. Hence we need to ensure here that
+ * all reference counts have been dropped before we start walking the
+ * LRU list.
*/
+ while (percpu_counter_sum(&btp->bt_io_count))
+ delay(100);
drain_workqueue(btp->bt_mount->m_buf_workqueue);
/* loop until there is nothing left on the lru list. */
@@ -1627,6 +1708,8 @@ xfs_free_buftarg(
struct xfs_buftarg *btp)
{
unregister_shrinker(&btp->bt_shrinker);
+ ASSERT(percpu_counter_sum(&btp->bt_io_count) == 0);
+ percpu_counter_destroy(&btp->bt_io_count);
list_lru_destroy(&btp->bt_lru);
if (mp->m_flags & XFS_MOUNT_BARRIER)
@@ -1691,6 +1774,9 @@ xfs_alloc_buftarg(
if (list_lru_init(&btp->bt_lru))
goto error;
+ if (percpu_counter_init(&btp->bt_io_count, 0, GFP_KERNEL))
+ goto error;
+
btp->bt_shrinker.count_objects = xfs_buftarg_shrink_count;
btp->bt_shrinker.scan_objects = xfs_buftarg_shrink_scan;
btp->bt_shrinker.seeks = DEFAULT_SEEKS;
@@ -1774,18 +1860,33 @@ xfs_buf_cmp(
return 0;
}
+/*
+ * submit buffers for write.
+ *
+ * When we have a large buffer list, we do not want to hold all the buffers
+ * locked while we block on the request queue waiting for IO dispatch. To avoid
+ * this problem, we lock and submit buffers in groups of 50, thereby minimising
+ * the lock hold times for lists which may contain thousands of objects.
+ *
+ * To do this, we sort the buffer list before we walk the list to lock and
+ * submit buffers, and we plug and unplug around each group of buffers we
+ * submit.
+ */
static int
-__xfs_buf_delwri_submit(
+xfs_buf_delwri_submit_buffers(
struct list_head *buffer_list,
- struct list_head *io_list,
- bool wait)
+ struct list_head *wait_list)
{
- struct blk_plug plug;
struct xfs_buf *bp, *n;
+ LIST_HEAD (submit_list);
int pinned = 0;
+ struct blk_plug plug;
+ list_sort(NULL, buffer_list, xfs_buf_cmp);
+
+ blk_start_plug(&plug);
list_for_each_entry_safe(bp, n, buffer_list, b_list) {
- if (!wait) {
+ if (!wait_list) {
if (xfs_buf_ispinned(bp)) {
pinned++;
continue;
@@ -1808,25 +1909,21 @@ __xfs_buf_delwri_submit(
continue;
}
- list_move_tail(&bp->b_list, io_list);
trace_xfs_buf_delwri_split(bp, _RET_IP_);
- }
-
- list_sort(NULL, io_list, xfs_buf_cmp);
-
- blk_start_plug(&plug);
- list_for_each_entry_safe(bp, n, io_list, b_list) {
- bp->b_flags &= ~(_XBF_DELWRI_Q | XBF_ASYNC | XBF_WRITE_FAIL);
- bp->b_flags |= XBF_WRITE | XBF_ASYNC;
/*
- * we do all Io submission async. This means if we need to wait
- * for IO completion we need to take an extra reference so the
- * buffer is still valid on the other side.
+ * We do all IO submission async. This means if we need
+ * to wait for IO completion we need to take an extra
+ * reference so the buffer is still valid on the other
+ * side. We need to move the buffer onto the io_list
+ * at this point so the caller can still access it.
*/
- if (wait)
+ bp->b_flags &= ~(_XBF_DELWRI_Q | XBF_WRITE_FAIL);
+ bp->b_flags |= XBF_WRITE | XBF_ASYNC;
+ if (wait_list) {
xfs_buf_hold(bp);
- else
+ list_move_tail(&bp->b_list, wait_list);
+ } else
list_del_init(&bp->b_list);
xfs_buf_submit(bp);
@@ -1849,8 +1946,7 @@ int
xfs_buf_delwri_submit_nowait(
struct list_head *buffer_list)
{
- LIST_HEAD (io_list);
- return __xfs_buf_delwri_submit(buffer_list, &io_list, false);
+ return xfs_buf_delwri_submit_buffers(buffer_list, NULL);
}
/*
@@ -1865,15 +1961,15 @@ int
xfs_buf_delwri_submit(
struct list_head *buffer_list)
{
- LIST_HEAD (io_list);
+ LIST_HEAD (wait_list);
int error = 0, error2;
struct xfs_buf *bp;
- __xfs_buf_delwri_submit(buffer_list, &io_list, true);
+ xfs_buf_delwri_submit_buffers(buffer_list, &wait_list);
/* Wait for IO to complete. */
- while (!list_empty(&io_list)) {
- bp = list_first_entry(&io_list, struct xfs_buf, b_list);
+ while (!list_empty(&wait_list)) {
+ bp = list_first_entry(&wait_list, struct xfs_buf, b_list);
list_del_init(&bp->b_list);
diff --git a/fs/xfs/xfs_buf.h b/fs/xfs/xfs_buf.h
index 8bfb974f0772844af09b11373fe11337d50685d7..1c2e52b2d926140b27e7a0e75f568165b7a07534 100644
--- a/fs/xfs/xfs_buf.h
+++ b/fs/xfs/xfs_buf.h
@@ -43,6 +43,7 @@ typedef enum {
#define XBF_READ (1 << 0) /* buffer intended for reading from device */
#define XBF_WRITE (1 << 1) /* buffer intended for writing to device */
#define XBF_READ_AHEAD (1 << 2) /* asynchronous read-ahead */
+#define XBF_NO_IOACCT (1 << 3) /* bypass I/O accounting (non-LRU bufs) */
#define XBF_ASYNC (1 << 4) /* initiator will not wait for completion */
#define XBF_DONE (1 << 5) /* all pages in the buffer uptodate */
#define XBF_STALE (1 << 6) /* buffer has been staled, do not find it */
@@ -62,6 +63,7 @@ typedef enum {
#define _XBF_KMEM (1 << 21)/* backed by heap memory */
#define _XBF_DELWRI_Q (1 << 22)/* buffer on a delwri queue */
#define _XBF_COMPOUND (1 << 23)/* compound buffer */
+#define _XBF_IN_FLIGHT (1 << 25) /* I/O in flight, for accounting purposes */
typedef unsigned int xfs_buf_flags_t;
@@ -81,7 +83,8 @@ typedef unsigned int xfs_buf_flags_t;
{ _XBF_PAGES, "PAGES" }, \
{ _XBF_KMEM, "KMEM" }, \
{ _XBF_DELWRI_Q, "DELWRI_Q" }, \
- { _XBF_COMPOUND, "COMPOUND" }
+ { _XBF_COMPOUND, "COMPOUND" }, \
+ { _XBF_IN_FLIGHT, "IN_FLIGHT" }
/*
@@ -115,6 +118,8 @@ typedef struct xfs_buftarg {
/* LRU control structures */
struct shrinker bt_shrinker;
struct list_lru bt_lru;
+
+ struct percpu_counter bt_io_count;
} xfs_buftarg_t;
struct xfs_buf;
diff --git a/fs/xfs/xfs_buf_item.c b/fs/xfs/xfs_buf_item.c
index 34257992934c4184feba8505c8342e2e0a1e9edc..e455f9098d496cdcf934040f03be89673e4f699e 100644
--- a/fs/xfs/xfs_buf_item.c
+++ b/fs/xfs/xfs_buf_item.c
@@ -359,7 +359,7 @@ xfs_buf_item_format(
for (i = 0; i < bip->bli_format_count; i++) {
xfs_buf_item_format_segment(bip, lv, &vecp, offset,
&bip->bli_formats[i]);
- offset += bp->b_maps[i].bm_len;
+ offset += BBTOB(bp->b_maps[i].bm_len);
}
/*
@@ -915,20 +915,28 @@ xfs_buf_item_log(
for (i = 0; i < bip->bli_format_count; i++) {
if (start > last)
break;
- end = start + BBTOB(bp->b_maps[i].bm_len);
+ end = start + BBTOB(bp->b_maps[i].bm_len) - 1;
+
+ /* skip to the map that includes the first byte to log */
if (first > end) {
start += BBTOB(bp->b_maps[i].bm_len);
continue;
}
+
+ /*
+ * Trim the range to this segment and mark it in the bitmap.
+ * Note that we must convert buffer offsets to segment relative
+ * offsets (e.g., the first byte of each segment is byte 0 of
+ * that segment).
+ */
if (first < start)
first = start;
if (end > last)
end = last;
-
- xfs_buf_item_log_segment(first, end,
+ xfs_buf_item_log_segment(first - start, end - start,
&bip->bli_formats[i].blf_data_map[0]);
- start += bp->b_maps[i].bm_len;
+ start += BBTOB(bp->b_maps[i].bm_len);
}
}
@@ -949,6 +957,7 @@ xfs_buf_item_free(
xfs_buf_log_item_t *bip)
{
xfs_buf_item_free_format(bip);
+ kmem_free(bip->bli_item.li_lv_shadow);
kmem_zone_free(xfs_buf_item_zone, bip);
}
@@ -1073,6 +1082,8 @@ xfs_buf_iodone_callback_error(
trace_xfs_buf_item_iodone_async(bp, _RET_IP_);
ASSERT(bp->b_iodone != NULL);
+ cfg = xfs_error_get_cfg(mp, XFS_ERR_METADATA, bp->b_error);
+
/*
* If the write was asynchronous then no one will be looking for the
* error. If this is the first failure of this type, clear the error
@@ -1080,13 +1091,12 @@ xfs_buf_iodone_callback_error(
* async write failure at least once, but we also need to set the buffer
* up to behave correctly now for repeated failures.
*/
- if (!(bp->b_flags & (XBF_STALE|XBF_WRITE_FAIL)) ||
+ if (!(bp->b_flags & (XBF_STALE | XBF_WRITE_FAIL)) ||
bp->b_last_error != bp->b_error) {
- bp->b_flags |= (XBF_WRITE | XBF_ASYNC |
- XBF_DONE | XBF_WRITE_FAIL);
+ bp->b_flags |= (XBF_WRITE | XBF_DONE | XBF_WRITE_FAIL);
bp->b_last_error = bp->b_error;
- bp->b_retries = 0;
- bp->b_first_retry_time = jiffies;
+ if (cfg->retry_timeout && !bp->b_first_retry_time)
+ bp->b_first_retry_time = jiffies;
xfs_buf_ioerror(bp, 0);
xfs_buf_submit(bp);
@@ -1097,7 +1107,6 @@ xfs_buf_iodone_callback_error(
* Repeated failure on an async write. Take action according to the
* error configuration we have been set up to use.
*/
- cfg = xfs_error_get_cfg(mp, XFS_ERR_METADATA, bp->b_error);
if (cfg->max_retries != XFS_ERR_RETRY_FOREVER &&
++bp->b_retries > cfg->max_retries)
diff --git a/fs/xfs/xfs_dquot.c b/fs/xfs/xfs_dquot.c
index e0646659ce16eaafa7b35833fac127fd13b80582..ccb0811963b27d2b112b23df77337ab9b2c54c2c 100644
--- a/fs/xfs/xfs_dquot.c
+++ b/fs/xfs/xfs_dquot.c
@@ -74,6 +74,7 @@ xfs_qm_dqdestroy(
{
ASSERT(list_empty(&dqp->q_lru));
+ kmem_free(dqp->q_logitem.qli_item.li_lv_shadow);
mutex_destroy(&dqp->q_qlock);
XFS_STATS_DEC(dqp->q_mount, xs_qm_dquot);
diff --git a/fs/xfs/xfs_dquot_item.c b/fs/xfs/xfs_dquot_item.c
index 814cff94e78f6752bb9bf70d61697320c409f9e7..2c7a1629e064b4fd1f647affc3432797d058ae26 100644
--- a/fs/xfs/xfs_dquot_item.c
+++ b/fs/xfs/xfs_dquot_item.c
@@ -370,6 +370,8 @@ xfs_qm_qoffend_logitem_committed(
spin_lock(&ailp->xa_lock);
xfs_trans_ail_delete(ailp, &qfs->qql_item, SHUTDOWN_LOG_IO_ERROR);
+ kmem_free(qfs->qql_item.li_lv_shadow);
+ kmem_free(lip->li_lv_shadow);
kmem_free(qfs);
kmem_free(qfe);
return (xfs_lsn_t)-1;
diff --git a/fs/xfs/xfs_error.c b/fs/xfs/xfs_error.c
index 88693a98fac5ed8261facecbd606cea0589c4d1f..ed7ee4e8af7380bcd1be33389b1d0b2eb04d08b2 100644
--- a/fs/xfs/xfs_error.c
+++ b/fs/xfs/xfs_error.c
@@ -55,12 +55,15 @@ xfs_error_test(int error_tag, int *fsidp, char *expression,
}
int
-xfs_errortag_add(int error_tag, xfs_mount_t *mp)
+xfs_errortag_add(unsigned int error_tag, xfs_mount_t *mp)
{
int i;
int len;
int64_t fsid;
+ if (error_tag >= XFS_ERRTAG_MAX)
+ return -EINVAL;
+
memcpy(&fsid, mp->m_fixedfsid, sizeof(xfs_fsid_t));
for (i = 0; i < XFS_NUM_INJECT_ERROR; i++) {
diff --git a/fs/xfs/xfs_error.h b/fs/xfs/xfs_error.h
index 4ed3042a0f1602945c884c60b7d3f7bb6c687a20..2e4f67f688560b39b9a58aa54a4168607f495918 100644
--- a/fs/xfs/xfs_error.h
+++ b/fs/xfs/xfs_error.h
@@ -128,7 +128,7 @@ extern int xfs_error_test(int, int *, char *, int, char *, unsigned long);
xfs_error_test((tag), (mp)->m_fixedfsid, "expr", __LINE__, __FILE__, \
(rf))))
-extern int xfs_errortag_add(int error_tag, struct xfs_mount *mp);
+extern int xfs_errortag_add(unsigned int error_tag, struct xfs_mount *mp);
extern int xfs_errortag_clearall(struct xfs_mount *mp, int loud);
#else
#define XFS_TEST_ERROR(expr, mp, tag, rf) (expr)
diff --git a/fs/xfs/xfs_extfree_item.c b/fs/xfs/xfs_extfree_item.c
index 4aa0153214f91fb9ec03621c0b006317ca3d0e09..ab779460ecbf3ab8d4c89fecdde1b4a48e66b746 100644
--- a/fs/xfs/xfs_extfree_item.c
+++ b/fs/xfs/xfs_extfree_item.c
@@ -40,6 +40,7 @@ void
xfs_efi_item_free(
struct xfs_efi_log_item *efip)
{
+ kmem_free(efip->efi_item.li_lv_shadow);
if (efip->efi_format.efi_nextents > XFS_EFI_MAX_FAST_EXTENTS)
kmem_free(efip);
else
@@ -300,6 +301,7 @@ static inline struct xfs_efd_log_item *EFD_ITEM(struct xfs_log_item *lip)
STATIC void
xfs_efd_item_free(struct xfs_efd_log_item *efdp)
{
+ kmem_free(efdp->efd_item.li_lv_shadow);
if (efdp->efd_format.efd_nextents > XFS_EFD_MAX_FAST_EXTENTS)
kmem_free(efdp);
else
diff --git a/fs/xfs/xfs_file.c b/fs/xfs/xfs_file.c
index 1b3dc9dd88611ec3cb231c7071d6d25c861a9244..ed95e5bb04e692b614983ea83bf870ac373a9b0c 100644
--- a/fs/xfs/xfs_file.c
+++ b/fs/xfs/xfs_file.c
@@ -37,6 +37,7 @@
#include "xfs_log.h"
#include "xfs_icache.h"
#include "xfs_pnfs.h"
+#include "xfs_iomap.h"
#include <linux/dcache.h>
#include <linux/falloc.h>
@@ -80,61 +81,17 @@ xfs_rw_ilock_demote(
}
/*
- * xfs_iozero clears the specified range supplied via the page cache (except in
- * the DAX case). Writes through the page cache will allocate blocks over holes,
- * though the callers usually map the holes first and avoid them. If a block is
- * not completely zeroed, then it will be read from disk before being partially
- * zeroed.
- *
- * In the DAX case, we can just directly write to the underlying pages. This
- * will not allocate blocks, but will avoid holes and unwritten extents and so
- * not do unnecessary work.
+ * Clear the specified ranges to zero through either the pagecache or DAX.
+ * Holes and unwritten extents will be left as-is as they already are zeroed.
*/
int
-xfs_iozero(
- struct xfs_inode *ip, /* inode */
- loff_t pos, /* offset in file */
- size_t count) /* size of data to zero */
+xfs_zero_range(
+ struct xfs_inode *ip,
+ xfs_off_t pos,
+ xfs_off_t count,
+ bool *did_zero)
{
- struct page *page;
- struct address_space *mapping;
- int status = 0;
-
-
- mapping = VFS_I(ip)->i_mapping;
- do {
- unsigned offset, bytes;
- void *fsdata;
-
- offset = (pos & (PAGE_SIZE -1)); /* Within page */
- bytes = PAGE_SIZE - offset;
- if (bytes > count)
- bytes = count;
-
- if (IS_DAX(VFS_I(ip))) {
- status = dax_zero_page_range(VFS_I(ip), pos, bytes,
- xfs_get_blocks_direct);
- if (status)
- break;
- } else {
- status = pagecache_write_begin(NULL, mapping, pos, bytes,
- AOP_FLAG_UNINTERRUPTIBLE,
- &page, &fsdata);
- if (status)
- break;
-
- zero_user(page, offset, bytes);
-
- status = pagecache_write_end(NULL, mapping, pos, bytes,
- bytes, page, fsdata);
- WARN_ON(status <= 0); /* can't return less than zero! */
- status = 0;
- }
- pos += bytes;
- count -= bytes;
- } while (count);
-
- return status;
+ return iomap_zero_range(VFS_I(ip), pos, count, NULL, &xfs_iomap_ops);
}
int
@@ -282,48 +239,35 @@ xfs_file_fsync(
}
STATIC ssize_t
-xfs_file_read_iter(
+xfs_file_dio_aio_read(
struct kiocb *iocb,
struct iov_iter *to)
{
- struct file *file = iocb->ki_filp;
- struct inode *inode = file->f_mapping->host;
+ struct address_space *mapping = iocb->ki_filp->f_mapping;
+ struct inode *inode = mapping->host;
struct xfs_inode *ip = XFS_I(inode);
- struct xfs_mount *mp = ip->i_mount;
- size_t size = iov_iter_count(to);
+ loff_t isize = i_size_read(inode);
+ size_t count = iov_iter_count(to);
+ struct iov_iter data;
+ struct xfs_buftarg *target;
ssize_t ret = 0;
- int ioflags = 0;
- xfs_fsize_t n;
- loff_t pos = iocb->ki_pos;
- XFS_STATS_INC(mp, xs_read_calls);
-
- if (unlikely(iocb->ki_flags & IOCB_DIRECT))
- ioflags |= XFS_IO_ISDIRECT;
- if (file->f_mode & FMODE_NOCMTIME)
- ioflags |= XFS_IO_INVIS;
-
- if ((ioflags & XFS_IO_ISDIRECT) && !IS_DAX(inode)) {
- xfs_buftarg_t *target =
- XFS_IS_REALTIME_INODE(ip) ?
- mp->m_rtdev_targp : mp->m_ddev_targp;
- /* DIO must be aligned to device logical sector size */
- if ((pos | size) & target->bt_logical_sectormask) {
- if (pos == i_size_read(inode))
- return 0;
- return -EINVAL;
- }
- }
+ trace_xfs_file_direct_read(ip, count, iocb->ki_pos);
- n = mp->m_super->s_maxbytes - pos;
- if (n <= 0 || size == 0)
- return 0;
+ if (!count)
+ return 0; /* skip atime */
- if (n < size)
- size = n;
+ if (XFS_IS_REALTIME_INODE(ip))
+ target = ip->i_mount->m_rtdev_targp;
+ else
+ target = ip->i_mount->m_ddev_targp;
- if (XFS_FORCED_SHUTDOWN(mp))
- return -EIO;
+ /* DIO must be aligned to device logical sector size */
+ if ((iocb->ki_pos | count) & target->bt_logical_sectormask) {
+ if (iocb->ki_pos == isize)
+ return 0;
+ return -EINVAL;
+ }
/*
* Locking is a bit tricky here. If we take an exclusive lock for direct
@@ -336,7 +280,7 @@ xfs_file_read_iter(
* serialisation.
*/
xfs_rw_ilock(ip, XFS_IOLOCK_SHARED);
- if ((ioflags & XFS_IO_ISDIRECT) && inode->i_mapping->nrpages) {
+ if (mapping->nrpages) {
xfs_rw_iunlock(ip, XFS_IOLOCK_SHARED);
xfs_rw_ilock(ip, XFS_IOLOCK_EXCL);
@@ -351,8 +295,8 @@ xfs_file_read_iter(
* flush and reduce the chances of repeated iolock cycles going
* forward.
*/
- if (inode->i_mapping->nrpages) {
- ret = filemap_write_and_wait(VFS_I(ip)->i_mapping);
+ if (mapping->nrpages) {
+ ret = filemap_write_and_wait(mapping);
if (ret) {
xfs_rw_iunlock(ip, XFS_IOLOCK_EXCL);
return ret;
@@ -363,20 +307,95 @@ xfs_file_read_iter(
* we fail to invalidate a page, but this should never
* happen on XFS. Warn if it does fail.
*/
- ret = invalidate_inode_pages2(VFS_I(ip)->i_mapping);
+ ret = invalidate_inode_pages2(mapping);
WARN_ON_ONCE(ret);
ret = 0;
}
xfs_rw_ilock_demote(ip, XFS_IOLOCK_EXCL);
}
- trace_xfs_file_read(ip, size, pos, ioflags);
+ data = *to;
+ ret = __blockdev_direct_IO(iocb, inode, target->bt_bdev, &data,
+ xfs_get_blocks_direct, NULL, NULL, 0);
+ if (ret > 0) {
+ iocb->ki_pos += ret;
+ iov_iter_advance(to, ret);
+ }
+ xfs_rw_iunlock(ip, XFS_IOLOCK_SHARED);
+ file_accessed(iocb->ki_filp);
+ return ret;
+}
+
+static noinline ssize_t
+xfs_file_dax_read(
+ struct kiocb *iocb,
+ struct iov_iter *to)
+{
+ struct address_space *mapping = iocb->ki_filp->f_mapping;
+ struct inode *inode = mapping->host;
+ struct xfs_inode *ip = XFS_I(inode);
+ struct iov_iter data = *to;
+ size_t count = iov_iter_count(to);
+ ssize_t ret = 0;
+
+ trace_xfs_file_dax_read(ip, count, iocb->ki_pos);
+
+ if (!count)
+ return 0; /* skip atime */
+
+ xfs_rw_ilock(ip, XFS_IOLOCK_SHARED);
+ ret = dax_do_io(iocb, inode, &data, xfs_get_blocks_direct, NULL, 0);
+ if (ret > 0) {
+ iocb->ki_pos += ret;
+ iov_iter_advance(to, ret);
+ }
+ xfs_rw_iunlock(ip, XFS_IOLOCK_SHARED);
+
+ file_accessed(iocb->ki_filp);
+ return ret;
+}
+
+STATIC ssize_t
+xfs_file_buffered_aio_read(
+ struct kiocb *iocb,
+ struct iov_iter *to)
+{
+ struct xfs_inode *ip = XFS_I(file_inode(iocb->ki_filp));
+ ssize_t ret;
+
+ trace_xfs_file_buffered_read(ip, iov_iter_count(to), iocb->ki_pos);
+
+ xfs_rw_ilock(ip, XFS_IOLOCK_SHARED);
ret = generic_file_read_iter(iocb, to);
+ xfs_rw_iunlock(ip, XFS_IOLOCK_SHARED);
+
+ return ret;
+}
+
+STATIC ssize_t
+xfs_file_read_iter(
+ struct kiocb *iocb,
+ struct iov_iter *to)
+{
+ struct inode *inode = file_inode(iocb->ki_filp);
+ struct xfs_mount *mp = XFS_I(inode)->i_mount;
+ ssize_t ret = 0;
+
+ XFS_STATS_INC(mp, xs_read_calls);
+
+ if (XFS_FORCED_SHUTDOWN(mp))
+ return -EIO;
+
+ if (IS_DAX(inode))
+ ret = xfs_file_dax_read(iocb, to);
+ else if (iocb->ki_flags & IOCB_DIRECT)
+ ret = xfs_file_dio_aio_read(iocb, to);
+ else
+ ret = xfs_file_buffered_aio_read(iocb, to);
+
if (ret > 0)
XFS_STATS_ADD(mp, xs_read_bytes, ret);
-
- xfs_rw_iunlock(ip, XFS_IOLOCK_SHARED);
return ret;
}
@@ -389,18 +408,14 @@ xfs_file_splice_read(
unsigned int flags)
{
struct xfs_inode *ip = XFS_I(infilp->f_mapping->host);
- int ioflags = 0;
ssize_t ret;
XFS_STATS_INC(ip->i_mount, xs_read_calls);
- if (infilp->f_mode & FMODE_NOCMTIME)
- ioflags |= XFS_IO_INVIS;
-
if (XFS_FORCED_SHUTDOWN(ip->i_mount))
return -EIO;
- trace_xfs_file_splice_read(ip, count, *ppos, ioflags);
+ trace_xfs_file_splice_read(ip, count, *ppos);
/*
* DAX inodes cannot ues the page cache for splice, so we have to push
@@ -423,49 +438,6 @@ xfs_file_splice_read(
return ret;
}
-/*
- * This routine is called to handle zeroing any space in the last block of the
- * file that is beyond the EOF. We do this since the size is being increased
- * without writing anything to that block and we don't want to read the
- * garbage on the disk.
- */
-STATIC int /* error (positive) */
-xfs_zero_last_block(
- struct xfs_inode *ip,
- xfs_fsize_t offset,
- xfs_fsize_t isize,
- bool *did_zeroing)
-{
- struct xfs_mount *mp = ip->i_mount;
- xfs_fileoff_t last_fsb = XFS_B_TO_FSBT(mp, isize);
- int zero_offset = XFS_B_FSB_OFFSET(mp, isize);
- int zero_len;
- int nimaps = 1;
- int error = 0;
- struct xfs_bmbt_irec imap;
-
- xfs_ilock(ip, XFS_ILOCK_EXCL);
- error = xfs_bmapi_read(ip, last_fsb, 1, &imap, &nimaps, 0);
- xfs_iunlock(ip, XFS_ILOCK_EXCL);
- if (error)
- return error;
-
- ASSERT(nimaps > 0);
-
- /*
- * If the block underlying isize is just a hole, then there
- * is nothing to zero.
- */
- if (imap.br_startblock == HOLESTARTBLOCK)
- return 0;
-
- zero_len = mp->m_sb.sb_blocksize - zero_offset;
- if (isize + zero_len > offset)
- zero_len = offset - isize;
- *did_zeroing = true;
- return xfs_iozero(ip, isize, zero_len);
-}
-
/*
* Zero any on disk space between the current EOF and the new, larger EOF.
*
@@ -484,94 +456,11 @@ xfs_zero_eof(
xfs_fsize_t isize, /* current inode size */
bool *did_zeroing)
{
- struct xfs_mount *mp = ip->i_mount;
- xfs_fileoff_t start_zero_fsb;
- xfs_fileoff_t end_zero_fsb;
- xfs_fileoff_t zero_count_fsb;
- xfs_fileoff_t last_fsb;
- xfs_fileoff_t zero_off;
- xfs_fsize_t zero_len;
- int nimaps;
- int error = 0;
- struct xfs_bmbt_irec imap;
-
ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL));
ASSERT(offset > isize);
trace_xfs_zero_eof(ip, isize, offset - isize);
-
- /*
- * First handle zeroing the block on which isize resides.
- *
- * We only zero a part of that block so it is handled specially.
- */
- if (XFS_B_FSB_OFFSET(mp, isize) != 0) {
- error = xfs_zero_last_block(ip, offset, isize, did_zeroing);
- if (error)
- return error;
- }
-
- /*
- * Calculate the range between the new size and the old where blocks
- * needing to be zeroed may exist.
- *
- * To get the block where the last byte in the file currently resides,
- * we need to subtract one from the size and truncate back to a block
- * boundary. We subtract 1 in case the size is exactly on a block
- * boundary.
- */
- last_fsb = isize ? XFS_B_TO_FSBT(mp, isize - 1) : (xfs_fileoff_t)-1;
- start_zero_fsb = XFS_B_TO_FSB(mp, (xfs_ufsize_t)isize);
- end_zero_fsb = XFS_B_TO_FSBT(mp, offset - 1);
- ASSERT((xfs_sfiloff_t)last_fsb < (xfs_sfiloff_t)start_zero_fsb);
- if (last_fsb == end_zero_fsb) {
- /*
- * The size was only incremented on its last block.
- * We took care of that above, so just return.
- */
- return 0;
- }
-
- ASSERT(start_zero_fsb <= end_zero_fsb);
- while (start_zero_fsb <= end_zero_fsb) {
- nimaps = 1;
- zero_count_fsb = end_zero_fsb - start_zero_fsb + 1;
-
- xfs_ilock(ip, XFS_ILOCK_EXCL);
- error = xfs_bmapi_read(ip, start_zero_fsb, zero_count_fsb,
- &imap, &nimaps, 0);
- xfs_iunlock(ip, XFS_ILOCK_EXCL);
- if (error)
- return error;
-
- ASSERT(nimaps > 0);
-
- if (imap.br_state == XFS_EXT_UNWRITTEN ||
- imap.br_startblock == HOLESTARTBLOCK) {
- start_zero_fsb = imap.br_startoff + imap.br_blockcount;
- ASSERT(start_zero_fsb <= (end_zero_fsb + 1));
- continue;
- }
-
- /*
- * There are blocks we need to zero.
- */
- zero_off = XFS_FSB_TO_B(mp, start_zero_fsb);
- zero_len = XFS_FSB_TO_B(mp, imap.br_blockcount);
-
- if ((zero_off + zero_len) > offset)
- zero_len = offset - zero_off;
-
- error = xfs_iozero(ip, zero_off, zero_len);
- if (error)
- return error;
-
- *did_zeroing = true;
- start_zero_fsb = imap.br_startoff + imap.br_blockcount;
- ASSERT(start_zero_fsb <= (end_zero_fsb + 1));
- }
-
- return 0;
+ return xfs_zero_range(ip, isize, offset - isize, did_zeroing);
}
/*
@@ -722,8 +611,7 @@ xfs_file_dio_aio_write(
mp->m_rtdev_targp : mp->m_ddev_targp;
/* DIO must be aligned to device logical sector size */
- if (!IS_DAX(inode) &&
- ((iocb->ki_pos | count) & target->bt_logical_sectormask))
+ if ((iocb->ki_pos | count) & target->bt_logical_sectormask)
return -EINVAL;
/* "unaligned" here means not aligned to a filesystem block */
@@ -762,7 +650,7 @@ xfs_file_dio_aio_write(
end = iocb->ki_pos + count - 1;
/*
- * See xfs_file_read_iter() for why we do a full-file flush here.
+ * See xfs_file_dio_aio_read() for why we do a full-file flush here.
*/
if (mapping->nrpages) {
ret = filemap_write_and_wait(VFS_I(ip)->i_mapping);
@@ -789,10 +677,12 @@ xfs_file_dio_aio_write(
iolock = XFS_IOLOCK_SHARED;
}
- trace_xfs_file_direct_write(ip, count, iocb->ki_pos, 0);
+ trace_xfs_file_direct_write(ip, count, iocb->ki_pos);
data = *from;
- ret = mapping->a_ops->direct_IO(iocb, &data);
+ ret = __blockdev_direct_IO(iocb, inode, target->bt_bdev, &data,
+ xfs_get_blocks_direct, xfs_end_io_direct_write,
+ NULL, DIO_ASYNC_EXTEND);
/* see generic_file_direct_write() for why this is necessary */
if (mapping->nrpages) {
@@ -809,10 +699,70 @@ xfs_file_dio_aio_write(
xfs_rw_iunlock(ip, iolock);
/*
- * No fallback to buffered IO on errors for XFS. DAX can result in
- * partial writes, but direct IO will either complete fully or fail.
+ * No fallback to buffered IO on errors for XFS, direct IO will either
+ * complete fully or fail.
*/
- ASSERT(ret < 0 || ret == count || IS_DAX(VFS_I(ip)));
+ ASSERT(ret < 0 || ret == count);
+ return ret;
+}
+
+static noinline ssize_t
+xfs_file_dax_write(
+ struct kiocb *iocb,
+ struct iov_iter *from)
+{
+ struct address_space *mapping = iocb->ki_filp->f_mapping;
+ struct inode *inode = mapping->host;
+ struct xfs_inode *ip = XFS_I(inode);
+ struct xfs_mount *mp = ip->i_mount;
+ ssize_t ret = 0;
+ int unaligned_io = 0;
+ int iolock;
+ struct iov_iter data;
+
+ /* "unaligned" here means not aligned to a filesystem block */
+ if ((iocb->ki_pos & mp->m_blockmask) ||
+ ((iocb->ki_pos + iov_iter_count(from)) & mp->m_blockmask)) {
+ unaligned_io = 1;
+ iolock = XFS_IOLOCK_EXCL;
+ } else if (mapping->nrpages) {
+ iolock = XFS_IOLOCK_EXCL;
+ } else {
+ iolock = XFS_IOLOCK_SHARED;
+ }
+ xfs_rw_ilock(ip, iolock);
+
+ ret = xfs_file_aio_write_checks(iocb, from, &iolock);
+ if (ret)
+ goto out;
+
+ /*
+ * Yes, even DAX files can have page cache attached to them: A zeroed
+ * page is inserted into the pagecache when we have to serve a write
+ * fault on a hole. It should never be dirtied and can simply be
+ * dropped from the pagecache once we get real data for the page.
+ */
+ if (mapping->nrpages) {
+ ret = invalidate_inode_pages2(mapping);
+ WARN_ON_ONCE(ret);
+ }
+
+ if (iolock == XFS_IOLOCK_EXCL && !unaligned_io) {
+ xfs_rw_ilock_demote(ip, XFS_IOLOCK_EXCL);
+ iolock = XFS_IOLOCK_SHARED;
+ }
+
+ trace_xfs_file_dax_write(ip, iov_iter_count(from), iocb->ki_pos);
+
+ data = *from;
+ ret = dax_do_io(iocb, inode, &data, xfs_get_blocks_direct,
+ xfs_end_io_direct_write, 0);
+ if (ret > 0) {
+ iocb->ki_pos += ret;
+ iov_iter_advance(from, ret);
+ }
+out:
+ xfs_rw_iunlock(ip, iolock);
return ret;
}
@@ -839,9 +789,8 @@ xfs_file_buffered_aio_write(
current->backing_dev_info = inode_to_bdi(inode);
write_retry:
- trace_xfs_file_buffered_write(ip, iov_iter_count(from),
- iocb->ki_pos, 0);
- ret = generic_perform_write(file, from, iocb->ki_pos);
+ trace_xfs_file_buffered_write(ip, iov_iter_count(from), iocb->ki_pos);
+ ret = iomap_file_buffered_write(iocb, from, &xfs_iomap_ops);
if (likely(ret >= 0))
iocb->ki_pos += ret;
@@ -895,7 +844,9 @@ xfs_file_write_iter(
if (XFS_FORCED_SHUTDOWN(ip->i_mount))
return -EIO;
- if ((iocb->ki_flags & IOCB_DIRECT) || IS_DAX(inode))
+ if (IS_DAX(inode))
+ ret = xfs_file_dax_write(iocb, from);
+ else if (iocb->ki_flags & IOCB_DIRECT)
ret = xfs_file_dio_aio_write(iocb, from);
else
ret = xfs_file_buffered_aio_write(iocb, from);
@@ -1553,7 +1504,7 @@ xfs_filemap_page_mkwrite(
if (IS_DAX(inode)) {
ret = dax_mkwrite(vma, vmf, xfs_get_blocks_dax_fault);
} else {
- ret = block_page_mkwrite(vma, vmf, xfs_get_blocks);
+ ret = iomap_page_mkwrite(vma, vmf, &xfs_iomap_ops);
ret = block_page_mkwrite_return(ret);
}
diff --git a/fs/xfs/xfs_fsops.c b/fs/xfs/xfs_fsops.c
index b4d75825ae3732d98ee19c8760719d92bd83a9cf..7191c3878b4a774e26be7a0d6a40a750edfa6538 100644
--- a/fs/xfs/xfs_fsops.c
+++ b/fs/xfs/xfs_fsops.c
@@ -667,8 +667,11 @@ xfs_reserve_blocks(
__uint64_t *inval,
xfs_fsop_resblks_t *outval)
{
- __int64_t lcounter, delta, fdblks_delta;
+ __int64_t lcounter, delta;
+ __int64_t fdblks_delta = 0;
__uint64_t request;
+ __int64_t free;
+ int error = 0;
/* If inval is null, report current values and return */
if (inval == (__uint64_t *)NULL) {
@@ -682,24 +685,23 @@ xfs_reserve_blocks(
request = *inval;
/*
- * With per-cpu counters, this becomes an interesting
- * problem. we needto work out if we are freeing or allocation
- * blocks first, then we can do the modification as necessary.
+ * With per-cpu counters, this becomes an interesting problem. we need
+ * to work out if we are freeing or allocation blocks first, then we can
+ * do the modification as necessary.
*
- * We do this under the m_sb_lock so that if we are near
- * ENOSPC, we will hold out any changes while we work out
- * what to do. This means that the amount of free space can
- * change while we do this, so we need to retry if we end up
- * trying to reserve more space than is available.
+ * We do this under the m_sb_lock so that if we are near ENOSPC, we will
+ * hold out any changes while we work out what to do. This means that
+ * the amount of free space can change while we do this, so we need to
+ * retry if we end up trying to reserve more space than is available.
*/
-retry:
spin_lock(&mp->m_sb_lock);
/*
* If our previous reservation was larger than the current value,
- * then move any unused blocks back to the free pool.
+ * then move any unused blocks back to the free pool. Modify the resblks
+ * counters directly since we shouldn't have any problems unreserving
+ * space.
*/
- fdblks_delta = 0;
if (mp->m_resblks > request) {
lcounter = mp->m_resblks_avail - request;
if (lcounter > 0) { /* release unused blocks */
@@ -707,54 +709,67 @@ xfs_reserve_blocks(
mp->m_resblks_avail -= lcounter;
}
mp->m_resblks = request;
- } else {
- __int64_t free;
+ if (fdblks_delta) {
+ spin_unlock(&mp->m_sb_lock);
+ error = xfs_mod_fdblocks(mp, fdblks_delta, 0);
+ spin_lock(&mp->m_sb_lock);
+ }
+
+ goto out;
+ }
+ /*
+ * If the request is larger than the current reservation, reserve the
+ * blocks before we update the reserve counters. Sample m_fdblocks and
+ * perform a partial reservation if the request exceeds free space.
+ */
+ error = -ENOSPC;
+ do {
free = percpu_counter_sum(&mp->m_fdblocks) -
XFS_ALLOC_SET_ASIDE(mp);
if (!free)
- goto out; /* ENOSPC and fdblks_delta = 0 */
+ break;
delta = request - mp->m_resblks;
lcounter = free - delta;
- if (lcounter < 0) {
+ if (lcounter < 0)
/* We can't satisfy the request, just get what we can */
- mp->m_resblks += free;
- mp->m_resblks_avail += free;
- fdblks_delta = -free;
- } else {
- fdblks_delta = -delta;
- mp->m_resblks = request;
- mp->m_resblks_avail += delta;
- }
- }
-out:
- if (outval) {
- outval->resblks = mp->m_resblks;
- outval->resblks_avail = mp->m_resblks_avail;
- }
- spin_unlock(&mp->m_sb_lock);
+ fdblks_delta = free;
+ else
+ fdblks_delta = delta;
- if (fdblks_delta) {
/*
- * If we are putting blocks back here, m_resblks_avail is
- * already at its max so this will put it in the free pool.
- *
- * If we need space, we'll either succeed in getting it
- * from the free block count or we'll get an enospc. If
- * we get a ENOSPC, it means things changed while we were
- * calculating fdblks_delta and so we should try again to
- * see if there is anything left to reserve.
+ * We'll either succeed in getting space from the free block
+ * count or we'll get an ENOSPC. If we get a ENOSPC, it means
+ * things changed while we were calculating fdblks_delta and so
+ * we should try again to see if there is anything left to
+ * reserve.
*
* Don't set the reserved flag here - we don't want to reserve
* the extra reserve blocks from the reserve.....
*/
- int error;
- error = xfs_mod_fdblocks(mp, fdblks_delta, 0);
- if (error == -ENOSPC)
- goto retry;
+ spin_unlock(&mp->m_sb_lock);
+ error = xfs_mod_fdblocks(mp, -fdblks_delta, 0);
+ spin_lock(&mp->m_sb_lock);
+ } while (error == -ENOSPC);
+
+ /*
+ * Update the reserve counters if blocks have been successfully
+ * allocated.
+ */
+ if (!error && fdblks_delta) {
+ mp->m_resblks += fdblks_delta;
+ mp->m_resblks_avail += fdblks_delta;
}
- return 0;
+
+out:
+ if (outval) {
+ outval->resblks = mp->m_resblks;
+ outval->resblks_avail = mp->m_resblks_avail;
+ }
+
+ spin_unlock(&mp->m_sb_lock);
+ return error;
}
int
diff --git a/fs/xfs/xfs_icache.c b/fs/xfs/xfs_icache.c
index 99ee6eee5e0b0d5af6e2e5124c4878a1fe2c4cb4..fb39a66914dd897251f952eece789f971ea31ab8 100644
--- a/fs/xfs/xfs_icache.c
+++ b/fs/xfs/xfs_icache.c
@@ -765,7 +765,7 @@ xfs_inode_ag_walk(
* Background scanning to trim post-EOF preallocated space. This is queued
* based on the 'speculative_prealloc_lifetime' tunable (5m by default).
*/
-STATIC void
+void
xfs_queue_eofblocks(
struct xfs_mount *mp)
{
diff --git a/fs/xfs/xfs_icache.h b/fs/xfs/xfs_icache.h
index 62f1f91c32cb345dda3c121b346ff4a5c4f17b43..05bac99bef75d9509ebbda00e81479bada9a225c 100644
--- a/fs/xfs/xfs_icache.h
+++ b/fs/xfs/xfs_icache.h
@@ -68,6 +68,7 @@ void xfs_inode_clear_eofblocks_tag(struct xfs_inode *ip);
int xfs_icache_free_eofblocks(struct xfs_mount *, struct xfs_eofblocks *);
int xfs_inode_free_quota_eofblocks(struct xfs_inode *ip);
void xfs_eofblocks_worker(struct work_struct *);
+void xfs_queue_eofblocks(struct xfs_mount *);
int xfs_inode_ag_iterator(struct xfs_mount *mp,
int (*execute)(struct xfs_inode *ip, int flags, void *args),
diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index ee6799e0476f397b0aba305fee9f7cddef188b8e..8825bcfd314c1d228b83a065fa901ce6a1be7128 100644
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -431,7 +431,7 @@ xfs_lock_inumorder(int lock_mode, int subclass)
* lock more than one at a time, lockdep will report false positives saying we
* have violated locking orders.
*/
-void
+static void
xfs_lock_inodes(
xfs_inode_t **ips,
int inodes,
@@ -667,14 +667,6 @@ xfs_ip2xflags(
return _xfs_dic2xflags(dic->di_flags, dic->di_flags2, XFS_IFORK_Q(ip));
}
-uint
-xfs_dic2xflags(
- struct xfs_dinode *dip)
-{
- return _xfs_dic2xflags(be16_to_cpu(dip->di_flags),
- be64_to_cpu(dip->di_flags2), XFS_DFORK_Q(dip));
-}
-
/*
* Lookups up an inode from "name". If ci_name is not NULL, then a CI match
* is allowed, otherwise it has to be an exact match. If a CI match is found,
@@ -748,7 +740,7 @@ xfs_lookup(
* are not linked into the directory structure - they are attached
* directly to the superblock - and so have no parent.
*/
-int
+static int
xfs_ialloc(
xfs_trans_t *tp,
xfs_inode_t *pip,
@@ -1085,7 +1077,7 @@ xfs_dir_ialloc(
* link count to go to zero, move the inode to AGI unlinked list so that it can
* be freed when the last active reference goes away via xfs_inactive().
*/
-int /* error */
+static int /* error */
xfs_droplink(
xfs_trans_t *tp,
xfs_inode_t *ip)
@@ -1104,7 +1096,7 @@ xfs_droplink(
/*
* Increment the link count on an inode & log the change.
*/
-int
+static int
xfs_bumplink(
xfs_trans_t *tp,
xfs_inode_t *ip)
diff --git a/fs/xfs/xfs_inode.h b/fs/xfs/xfs_inode.h
index e52d7c7aeb5b7773558a4d218afbb2a69cdaafd4..8eb78ec4a6e227d6034848edaf2a8fce77c2ca7e 100644
--- a/fs/xfs/xfs_inode.h
+++ b/fs/xfs/xfs_inode.h
@@ -395,12 +395,8 @@ void xfs_ilock_demote(xfs_inode_t *, uint);
int xfs_isilocked(xfs_inode_t *, uint);
uint xfs_ilock_data_map_shared(struct xfs_inode *);
uint xfs_ilock_attr_map_shared(struct xfs_inode *);
-int xfs_ialloc(struct xfs_trans *, xfs_inode_t *, umode_t,
- xfs_nlink_t, xfs_dev_t, prid_t, int,
- struct xfs_buf **, xfs_inode_t **);
uint xfs_ip2xflags(struct xfs_inode *);
-uint xfs_dic2xflags(struct xfs_dinode *);
int xfs_ifree(struct xfs_trans *, xfs_inode_t *,
struct xfs_bmap_free *);
int xfs_itruncate_extents(struct xfs_trans **, struct xfs_inode *,
@@ -411,7 +407,6 @@ void xfs_iunpin_wait(xfs_inode_t *);
#define xfs_ipincount(ip) ((unsigned int) atomic_read(&ip->i_pincount))
int xfs_iflush(struct xfs_inode *, struct xfs_buf **);
-void xfs_lock_inodes(xfs_inode_t **, int, uint);
void xfs_lock_two_inodes(xfs_inode_t *, xfs_inode_t *, uint);
xfs_extlen_t xfs_get_extsz_hint(struct xfs_inode *ip);
@@ -419,8 +414,6 @@ xfs_extlen_t xfs_get_extsz_hint(struct xfs_inode *ip);
int xfs_dir_ialloc(struct xfs_trans **, struct xfs_inode *, umode_t,
xfs_nlink_t, xfs_dev_t, prid_t, int,
struct xfs_inode **, int *);
-int xfs_droplink(struct xfs_trans *, struct xfs_inode *);
-int xfs_bumplink(struct xfs_trans *, struct xfs_inode *);
/* from xfs_file.c */
enum xfs_prealloc_flags {
@@ -434,7 +427,8 @@ int xfs_update_prealloc_flags(struct xfs_inode *ip,
enum xfs_prealloc_flags flags);
int xfs_zero_eof(struct xfs_inode *ip, xfs_off_t offset,
xfs_fsize_t isize, bool *did_zeroing);
-int xfs_iozero(struct xfs_inode *ip, loff_t pos, size_t count);
+int xfs_zero_range(struct xfs_inode *ip, xfs_off_t pos, xfs_off_t count,
+ bool *did_zero);
loff_t __xfs_seek_hole_data(struct inode *inode, loff_t start,
loff_t eof, int whence);
@@ -479,14 +473,4 @@ do { \
extern struct kmem_zone *xfs_inode_zone;
-/*
- * Flags for read/write calls
- */
-#define XFS_IO_ISDIRECT 0x00001 /* bypass page cache */
-#define XFS_IO_INVIS 0x00002 /* don't update inode timestamps */
-
-#define XFS_IO_FLAGS \
- { XFS_IO_ISDIRECT, "DIRECT" }, \
- { XFS_IO_INVIS, "INVIS"}
-
#endif /* __XFS_INODE_H__ */
diff --git a/fs/xfs/xfs_inode_item.c b/fs/xfs/xfs_inode_item.c
index a1b07612224c95ea56391474a4bb790fec07fab6..892c2aced20788cb9875dc3a9cddee78dc0b1b8b 100644
--- a/fs/xfs/xfs_inode_item.c
+++ b/fs/xfs/xfs_inode_item.c
@@ -651,6 +651,7 @@ void
xfs_inode_item_destroy(
xfs_inode_t *ip)
{
+ kmem_free(ip->i_itemp->ili_item.li_lv_shadow);
kmem_zone_free(xfs_ili_zone, ip->i_itemp);
}
diff --git a/fs/xfs/xfs_ioctl.c b/fs/xfs/xfs_ioctl.c
index 63a6ff2cfc6821961265136e1f62cf455da3b195..9a7c87809d3b331bce018873f06ebae2ecc700ec 100644
--- a/fs/xfs/xfs_ioctl.c
+++ b/fs/xfs/xfs_ioctl.c
@@ -595,13 +595,12 @@ xfs_attrmulti_by_handle(
int
xfs_ioc_space(
- struct xfs_inode *ip,
- struct inode *inode,
struct file *filp,
- int ioflags,
unsigned int cmd,
xfs_flock64_t *bf)
{
+ struct inode *inode = file_inode(filp);
+ struct xfs_inode *ip = XFS_I(inode);
struct iattr iattr;
enum xfs_prealloc_flags flags = 0;
uint iolock = XFS_IOLOCK_EXCL;
@@ -626,7 +625,7 @@ xfs_ioc_space(
if (filp->f_flags & O_DSYNC)
flags |= XFS_PREALLOC_SYNC;
- if (ioflags & XFS_IO_INVIS)
+ if (filp->f_mode & FMODE_NOCMTIME)
flags |= XFS_PREALLOC_INVISIBLE;
error = mnt_want_write_file(filp);
@@ -1464,8 +1463,7 @@ xfs_getbmap_format(void **ap, struct getbmapx *bmv, int *full)
STATIC int
xfs_ioc_getbmap(
- struct xfs_inode *ip,
- int ioflags,
+ struct file *file,
unsigned int cmd,
void __user *arg)
{
@@ -1479,10 +1477,10 @@ xfs_ioc_getbmap(
return -EINVAL;
bmx.bmv_iflags = (cmd == XFS_IOC_GETBMAPA ? BMV_IF_ATTRFORK : 0);
- if (ioflags & XFS_IO_INVIS)
+ if (file->f_mode & FMODE_NOCMTIME)
bmx.bmv_iflags |= BMV_IF_NO_DMAPI_READ;
- error = xfs_getbmap(ip, &bmx, xfs_getbmap_format,
+ error = xfs_getbmap(XFS_I(file_inode(file)), &bmx, xfs_getbmap_format,
(__force struct getbmap *)arg+1);
if (error)
return error;
@@ -1575,6 +1573,11 @@ xfs_ioc_swapext(
goto out_put_tmp_file;
}
+ /*
+ * We need to ensure that the fds passed in point to XFS inodes
+ * before we cast and access them as XFS structures as we have no
+ * control over what the user passes us here.
+ */
if (f.file->f_op != &xfs_file_operations ||
tmp.file->f_op != &xfs_file_operations) {
error = -EINVAL;
@@ -1625,12 +1628,8 @@ xfs_file_ioctl(
struct xfs_inode *ip = XFS_I(inode);
struct xfs_mount *mp = ip->i_mount;
void __user *arg = (void __user *)p;
- int ioflags = 0;
int error;
- if (filp->f_mode & FMODE_NOCMTIME)
- ioflags |= XFS_IO_INVIS;
-
trace_xfs_file_ioctl(ip);
switch (cmd) {
@@ -1649,7 +1648,7 @@ xfs_file_ioctl(
if (copy_from_user(&bf, arg, sizeof(bf)))
return -EFAULT;
- return xfs_ioc_space(ip, inode, filp, ioflags, cmd, &bf);
+ return xfs_ioc_space(filp, cmd, &bf);
}
case XFS_IOC_DIOINFO: {
struct dioattr da;
@@ -1708,7 +1707,7 @@ xfs_file_ioctl(
case XFS_IOC_GETBMAP:
case XFS_IOC_GETBMAPA:
- return xfs_ioc_getbmap(ip, ioflags, cmd, arg);
+ return xfs_ioc_getbmap(filp, cmd, arg);
case XFS_IOC_GETBMAPX:
return xfs_ioc_getbmapx(ip, arg);
diff --git a/fs/xfs/xfs_ioctl.h b/fs/xfs/xfs_ioctl.h
index 77c02c7900b6eb8d78276abdd7d0b6ec03c12e29..8b52881bfd9015d4dcd4c8d97932b626f8d57692 100644
--- a/fs/xfs/xfs_ioctl.h
+++ b/fs/xfs/xfs_ioctl.h
@@ -20,10 +20,7 @@
extern int
xfs_ioc_space(
- struct xfs_inode *ip,
- struct inode *inode,
struct file *filp,
- int ioflags,
unsigned int cmd,
xfs_flock64_t *bf);
diff --git a/fs/xfs/xfs_ioctl32.c b/fs/xfs/xfs_ioctl32.c
index 1a05d8ae327dbc2fa0e6d3212bbfde1a209a5502..321f57721b922034008f81994a317ad79d2cc845 100644
--- a/fs/xfs/xfs_ioctl32.c
+++ b/fs/xfs/xfs_ioctl32.c
@@ -532,12 +532,8 @@ xfs_file_compat_ioctl(
struct xfs_inode *ip = XFS_I(inode);
struct xfs_mount *mp = ip->i_mount;
void __user *arg = (void __user *)p;
- int ioflags = 0;
int error;
- if (filp->f_mode & FMODE_NOCMTIME)
- ioflags |= XFS_IO_INVIS;
-
trace_xfs_file_compat_ioctl(ip);
switch (cmd) {
@@ -589,7 +585,7 @@ xfs_file_compat_ioctl(
if (xfs_compat_flock64_copyin(&bf, arg))
return -EFAULT;
cmd = _NATIVE_IOC(cmd, struct xfs_flock64);
- return xfs_ioc_space(ip, inode, filp, ioflags, cmd, &bf);
+ return xfs_ioc_space(filp, cmd, &bf);
}
case XFS_IOC_FSGEOMETRY_V1_32:
return xfs_compat_ioc_fsgeometry_v1(mp, arg);
diff --git a/fs/xfs/xfs_iomap.c b/fs/xfs/xfs_iomap.c
index 58391355a44df71b7973ae132bb4b5adc2f77a9b..620fc91204443c62466283c1e92553656cde35f1 100644
--- a/fs/xfs/xfs_iomap.c
+++ b/fs/xfs/xfs_iomap.c
@@ -15,6 +15,7 @@
* along with this program; if not, write the Free Software Foundation,
* Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
+#include <linux/iomap.h>
#include "xfs.h"
#include "xfs_fs.h"
#include "xfs_shared.h"
@@ -940,3 +941,173 @@ xfs_iomap_write_unwritten(
xfs_iunlock(ip, XFS_ILOCK_EXCL);
return error;
}
+
+void
+xfs_bmbt_to_iomap(
+ struct xfs_inode *ip,
+ struct iomap *iomap,
+ struct xfs_bmbt_irec *imap)
+{
+ struct xfs_mount *mp = ip->i_mount;
+
+ if (imap->br_startblock == HOLESTARTBLOCK) {
+ iomap->blkno = IOMAP_NULL_BLOCK;
+ iomap->type = IOMAP_HOLE;
+ } else if (imap->br_startblock == DELAYSTARTBLOCK) {
+ iomap->blkno = IOMAP_NULL_BLOCK;
+ iomap->type = IOMAP_DELALLOC;
+ } else {
+ iomap->blkno = xfs_fsb_to_db(ip, imap->br_startblock);
+ if (imap->br_state == XFS_EXT_UNWRITTEN)
+ iomap->type = IOMAP_UNWRITTEN;
+ else
+ iomap->type = IOMAP_MAPPED;
+ }
+ iomap->offset = XFS_FSB_TO_B(mp, imap->br_startoff);
+ iomap->length = XFS_FSB_TO_B(mp, imap->br_blockcount);
+ iomap->bdev = xfs_find_bdev_for_inode(VFS_I(ip));
+}
+
+static inline bool imap_needs_alloc(struct xfs_bmbt_irec *imap, int nimaps)
+{
+ return !nimaps ||
+ imap->br_startblock == HOLESTARTBLOCK ||
+ imap->br_startblock == DELAYSTARTBLOCK;
+}
+
+static int
+xfs_file_iomap_begin(
+ struct inode *inode,
+ loff_t offset,
+ loff_t length,
+ unsigned flags,
+ struct iomap *iomap)
+{
+ struct xfs_inode *ip = XFS_I(inode);
+ struct xfs_mount *mp = ip->i_mount;
+ struct xfs_bmbt_irec imap;
+ xfs_fileoff_t offset_fsb, end_fsb;
+ int nimaps = 1, error = 0;
+
+ if (XFS_FORCED_SHUTDOWN(mp))
+ return -EIO;
+
+ xfs_ilock(ip, XFS_ILOCK_EXCL);
+
+ ASSERT(offset <= mp->m_super->s_maxbytes);
+ if ((xfs_fsize_t)offset + length > mp->m_super->s_maxbytes)
+ length = mp->m_super->s_maxbytes - offset;
+ offset_fsb = XFS_B_TO_FSBT(mp, offset);
+ end_fsb = XFS_B_TO_FSB(mp, offset + length);
+
+ error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb, &imap,
+ &nimaps, XFS_BMAPI_ENTIRE);
+ if (error) {
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ return error;
+ }
+
+ if ((flags & IOMAP_WRITE) && imap_needs_alloc(&imap, nimaps)) {
+ /*
+ * We cap the maximum length we map here to MAX_WRITEBACK_PAGES
+ * pages to keep the chunks of work done where somewhat symmetric
+ * with the work writeback does. This is a completely arbitrary
+ * number pulled out of thin air as a best guess for initial
+ * testing.
+ *
+ * Note that the values needs to be less than 32-bits wide until
+ * the lower level functions are updated.
+ */
+ length = min_t(loff_t, length, 1024 * PAGE_SIZE);
+ if (xfs_get_extsz_hint(ip)) {
+ /*
+ * xfs_iomap_write_direct() expects the shared lock. It
+ * is unlocked on return.
+ */
+ xfs_ilock_demote(ip, XFS_ILOCK_EXCL);
+ error = xfs_iomap_write_direct(ip, offset, length, &imap,
+ nimaps);
+ } else {
+ error = xfs_iomap_write_delay(ip, offset, length, &imap);
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ }
+
+ if (error)
+ return error;
+
+ trace_xfs_iomap_alloc(ip, offset, length, 0, &imap);
+ xfs_bmbt_to_iomap(ip, iomap, &imap);
+ } else if (nimaps) {
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ trace_xfs_iomap_found(ip, offset, length, 0, &imap);
+ xfs_bmbt_to_iomap(ip, iomap, &imap);
+ } else {
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+ trace_xfs_iomap_not_found(ip, offset, length, 0, &imap);
+ iomap->blkno = IOMAP_NULL_BLOCK;
+ iomap->type = IOMAP_HOLE;
+ iomap->offset = offset;
+ iomap->length = length;
+ }
+
+ return 0;
+}
+
+static int
+xfs_file_iomap_end_delalloc(
+ struct xfs_inode *ip,
+ loff_t offset,
+ loff_t length,
+ ssize_t written)
+{
+ struct xfs_mount *mp = ip->i_mount;
+ xfs_fileoff_t start_fsb;
+ xfs_fileoff_t end_fsb;
+ int error = 0;
+
+ start_fsb = XFS_B_TO_FSB(mp, offset + written);
+ end_fsb = XFS_B_TO_FSB(mp, offset + length);
+
+ /*
+ * Trim back delalloc blocks if we didn't manage to write the whole
+ * range reserved.
+ *
+ * We don't need to care about racing delalloc as we hold i_mutex
+ * across the reserve/allocate/unreserve calls. If there are delalloc
+ * blocks in the range, they are ours.
+ */
+ if (start_fsb < end_fsb) {
+ xfs_ilock(ip, XFS_ILOCK_EXCL);
+ error = xfs_bmap_punch_delalloc_range(ip, start_fsb,
+ end_fsb - start_fsb);
+ xfs_iunlock(ip, XFS_ILOCK_EXCL);
+
+ if (error && !XFS_FORCED_SHUTDOWN(mp)) {
+ xfs_alert(mp, "%s: unable to clean up ino %lld",
+ __func__, ip->i_ino);
+ return error;
+ }
+ }
+
+ return 0;
+}
+
+static int
+xfs_file_iomap_end(
+ struct inode *inode,
+ loff_t offset,
+ loff_t length,
+ ssize_t written,
+ unsigned flags,
+ struct iomap *iomap)
+{
+ if ((flags & IOMAP_WRITE) && iomap->type == IOMAP_DELALLOC)
+ return xfs_file_iomap_end_delalloc(XFS_I(inode), offset,
+ length, written);
+ return 0;
+}
+
+struct iomap_ops xfs_iomap_ops = {
+ .iomap_begin = xfs_file_iomap_begin,
+ .iomap_end = xfs_file_iomap_end,
+};
diff --git a/fs/xfs/xfs_iomap.h b/fs/xfs/xfs_iomap.h
index 8688e663d744077fcdb6615f00fc384fa0ea6f3e..e066d045e2ffe629919517b9003ad88a036b0449 100644
--- a/fs/xfs/xfs_iomap.h
+++ b/fs/xfs/xfs_iomap.h
@@ -18,6 +18,8 @@
#ifndef __XFS_IOMAP_H__
#define __XFS_IOMAP_H__
+#include <linux/iomap.h>
+
struct xfs_inode;
struct xfs_bmbt_irec;
@@ -29,4 +31,9 @@ int xfs_iomap_write_allocate(struct xfs_inode *, xfs_off_t,
struct xfs_bmbt_irec *);
int xfs_iomap_write_unwritten(struct xfs_inode *, xfs_off_t, xfs_off_t);
+void xfs_bmbt_to_iomap(struct xfs_inode *, struct iomap *,
+ struct xfs_bmbt_irec *);
+
+extern struct iomap_ops xfs_iomap_ops;
+
#endif /* __XFS_IOMAP_H__*/
diff --git a/fs/xfs/xfs_iops.c b/fs/xfs/xfs_iops.c
index c5d4eba6972eb17327be763e7bd914c5f4da3a59..ab820f84ed507c26b6b355d70660814c82f377c0 100644
--- a/fs/xfs/xfs_iops.c
+++ b/fs/xfs/xfs_iops.c
@@ -38,12 +38,13 @@
#include "xfs_dir2.h"
#include "xfs_trans_space.h"
#include "xfs_pnfs.h"
+#include "xfs_iomap.h"
#include <linux/capability.h>
#include <linux/xattr.h>
#include <linux/posix_acl.h>
#include <linux/security.h>
-#include <linux/fiemap.h>
+#include <linux/iomap.h>
#include <linux/slab.h>
/*
@@ -800,21 +801,31 @@ xfs_setattr_size(
if (error)
return error;
+ /*
+ * Wait for all direct I/O to complete.
+ */
+ inode_dio_wait(inode);
+
/*
* File data changes must be complete before we start the transaction to
* modify the inode. This needs to be done before joining the inode to
* the transaction because the inode cannot be unlocked once it is a
* part of the transaction.
*
- * Start with zeroing any data block beyond EOF that we may expose on
- * file extension.
+ * Start with zeroing any data beyond EOF that we may expose on file
+ * extension, or zeroing out the rest of the block on a downward
+ * truncate.
*/
if (newsize > oldsize) {
error = xfs_zero_eof(ip, newsize, oldsize, &did_zeroing);
- if (error)
- return error;
+ } else {
+ error = iomap_truncate_page(inode, newsize, &did_zeroing,
+ &xfs_iomap_ops);
}
+ if (error)
+ return error;
+
/*
* We are going to log the inode size change in this transaction so
* any previous writes that are beyond the on disk EOF and the new
@@ -823,17 +834,14 @@ xfs_setattr_size(
* problem. Note that this includes any block zeroing we did above;
* otherwise those blocks may not be zeroed after a crash.
*/
- if (newsize > ip->i_d.di_size &&
- (oldsize != ip->i_d.di_size || did_zeroing)) {
+ if (did_zeroing ||
+ (newsize > ip->i_d.di_size && oldsize != ip->i_d.di_size)) {
error = filemap_write_and_wait_range(VFS_I(ip)->i_mapping,
ip->i_d.di_size, newsize);
if (error)
return error;
}
- /* Now wait for all direct I/O to complete. */
- inode_dio_wait(inode);
-
/*
* We've already locked out new page faults, so now we can safely remove
* pages from the page cache knowing they won't get refaulted until we
@@ -851,13 +859,6 @@ xfs_setattr_size(
* to hope that the caller sees ENOMEM and retries the truncate
* operation.
*/
- if (IS_DAX(inode))
- error = dax_truncate_page(inode, newsize, xfs_get_blocks_direct);
- else
- error = block_truncate_page(inode->i_mapping, newsize,
- xfs_get_blocks);
- if (error)
- return error;
truncate_setsize(inode, newsize);
error = xfs_trans_alloc(mp, &M_RES(mp)->tr_itruncate, 0, 0, 0, &tp);
@@ -998,51 +999,6 @@ xfs_vn_update_time(
return xfs_trans_commit(tp);
}
-#define XFS_FIEMAP_FLAGS (FIEMAP_FLAG_SYNC|FIEMAP_FLAG_XATTR)
-
-/*
- * Call fiemap helper to fill in user data.
- * Returns positive errors to xfs_getbmap.
- */
-STATIC int
-xfs_fiemap_format(
- void **arg,
- struct getbmapx *bmv,
- int *full)
-{
- int error;
- struct fiemap_extent_info *fieinfo = *arg;
- u32 fiemap_flags = 0;
- u64 logical, physical, length;
-
- /* Do nothing for a hole */
- if (bmv->bmv_block == -1LL)
- return 0;
-
- logical = BBTOB(bmv->bmv_offset);
- physical = BBTOB(bmv->bmv_block);
- length = BBTOB(bmv->bmv_length);
-
- if (bmv->bmv_oflags & BMV_OF_PREALLOC)
- fiemap_flags |= FIEMAP_EXTENT_UNWRITTEN;
- else if (bmv->bmv_oflags & BMV_OF_DELALLOC) {
- fiemap_flags |= (FIEMAP_EXTENT_DELALLOC |
- FIEMAP_EXTENT_UNKNOWN);
- physical = 0; /* no block yet */
- }
- if (bmv->bmv_oflags & BMV_OF_LAST)
- fiemap_flags |= FIEMAP_EXTENT_LAST;
-
- error = fiemap_fill_next_extent(fieinfo, logical, physical,
- length, fiemap_flags);
- if (error > 0) {
- error = 0;
- *full = 1; /* user array now full */
- }
-
- return error;
-}
-
STATIC int
xfs_vn_fiemap(
struct inode *inode,
@@ -1050,38 +1006,13 @@ xfs_vn_fiemap(
u64 start,
u64 length)
{
- xfs_inode_t *ip = XFS_I(inode);
- struct getbmapx bm;
int error;
- error = fiemap_check_flags(fieinfo, XFS_FIEMAP_FLAGS);
- if (error)
- return error;
-
- /* Set up bmap header for xfs internal routine */
- bm.bmv_offset = BTOBBT(start);
- /* Special case for whole file */
- if (length == FIEMAP_MAX_OFFSET)
- bm.bmv_length = -1LL;
- else
- bm.bmv_length = BTOBB(start + length) - bm.bmv_offset;
-
- /* We add one because in getbmap world count includes the header */
- bm.bmv_count = !fieinfo->fi_extents_max ? MAXEXTNUM :
- fieinfo->fi_extents_max + 1;
- bm.bmv_count = min_t(__s32, bm.bmv_count,
- (PAGE_SIZE * 16 / sizeof(struct getbmapx)));
- bm.bmv_iflags = BMV_IF_PREALLOC | BMV_IF_NO_HOLES;
- if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR)
- bm.bmv_iflags |= BMV_IF_ATTRFORK;
- if (!(fieinfo->fi_flags & FIEMAP_FLAG_SYNC))
- bm.bmv_iflags |= BMV_IF_DELALLOC;
-
- error = xfs_getbmap(ip, &bm, xfs_fiemap_format, fieinfo);
- if (error)
- return error;
+ xfs_ilock(XFS_I(inode), XFS_IOLOCK_SHARED);
+ error = iomap_fiemap(inode, fieinfo, start, length, &xfs_iomap_ops);
+ xfs_iunlock(XFS_I(inode), XFS_IOLOCK_SHARED);
- return 0;
+ return error;
}
STATIC int
diff --git a/fs/xfs/xfs_linux.h b/fs/xfs/xfs_linux.h
index a8192dc797dcc45315a5bfdff067992e10cd85ba..b8d64d520e125ca1e1ad78742450f51ea04fe013 100644
--- a/fs/xfs/xfs_linux.h
+++ b/fs/xfs/xfs_linux.h
@@ -328,13 +328,6 @@ static inline __uint64_t howmany_64(__uint64_t x, __uint32_t y)
return x;
}
-/* ARM old ABI has some weird alignment/padding */
-#if defined(__arm__) && !defined(__ARM_EABI__)
-#define __arch_pack __attribute__((packed))
-#else
-#define __arch_pack
-#endif
-
#define ASSERT_ALWAYS(expr) \
(unlikely(expr) ? (void)0 : assfail(#expr, __FILE__, __LINE__))
diff --git a/fs/xfs/xfs_log.c b/fs/xfs/xfs_log.c
index bde02f1fba7323a2186edcd8462df8d2b9273fc5..3b74fa011bb1566ce43dedc2fbdbc49336645d84 100644
--- a/fs/xfs/xfs_log.c
+++ b/fs/xfs/xfs_log.c
@@ -788,7 +788,7 @@ xfs_log_mount_cancel(
* As far as I know, there weren't any dependencies on the old behaviour.
*/
-int
+static int
xfs_log_unmount_write(xfs_mount_t *mp)
{
struct xlog *log = mp->m_log;
@@ -1036,7 +1036,7 @@ xfs_log_space_wake(
* there's no point in running a dummy transaction at this point because we
* can't start trying to idle the log until both the CIL and AIL are empty.
*/
-int
+static int
xfs_log_need_covered(xfs_mount_t *mp)
{
struct xlog *log = mp->m_log;
@@ -1177,7 +1177,7 @@ xlog_space_left(
* The log manager needs its own routine, in order to control what
* happens with the buffer after the write completes.
*/
-void
+static void
xlog_iodone(xfs_buf_t *bp)
{
struct xlog_in_core *iclog = bp->b_fspriv;
@@ -1302,7 +1302,7 @@ xfs_log_work_queue(
* disk. If there is nothing dirty, then we might need to cover the log to
* indicate that the filesystem is idle.
*/
-void
+static void
xfs_log_worker(
struct work_struct *work)
{
@@ -1415,7 +1415,7 @@ xlog_alloc_log(
*/
error = -ENOMEM;
bp = xfs_buf_alloc(mp->m_logdev_targp, XFS_BUF_DADDR_NULL,
- BTOBB(log->l_iclog_size), 0);
+ BTOBB(log->l_iclog_size), XBF_NO_IOACCT);
if (!bp)
goto out_free_log;
@@ -1454,7 +1454,8 @@ xlog_alloc_log(
prev_iclog = iclog;
bp = xfs_buf_get_uncached(mp->m_logdev_targp,
- BTOBB(log->l_iclog_size), 0);
+ BTOBB(log->l_iclog_size),
+ XBF_NO_IOACCT);
if (!bp)
goto out_free_iclog;
diff --git a/fs/xfs/xfs_log.h b/fs/xfs/xfs_log.h
index 80ba0c047090165cb6353bcf32ae560fe82ef418..b5e71072fde5938105684acef3fc93ab6f390784 100644
--- a/fs/xfs/xfs_log.h
+++ b/fs/xfs/xfs_log.h
@@ -163,12 +163,8 @@ int xfs_log_reserve(struct xfs_mount *mp,
__uint8_t clientid,
bool permanent);
int xfs_log_regrant(struct xfs_mount *mp, struct xlog_ticket *tic);
-int xfs_log_unmount_write(struct xfs_mount *mp);
void xfs_log_unmount(struct xfs_mount *mp);
int xfs_log_force_umount(struct xfs_mount *mp, int logerror);
-int xfs_log_need_covered(struct xfs_mount *mp);
-
-void xlog_iodone(struct xfs_buf *);
struct xlog_ticket *xfs_log_ticket_get(struct xlog_ticket *ticket);
void xfs_log_ticket_put(struct xlog_ticket *ticket);
@@ -178,7 +174,6 @@ void xfs_log_commit_cil(struct xfs_mount *mp, struct xfs_trans *tp,
bool xfs_log_item_in_current_chkpt(struct xfs_log_item *lip);
void xfs_log_work_queue(struct xfs_mount *mp);
-void xfs_log_worker(struct work_struct *work);
void xfs_log_quiesce(struct xfs_mount *mp);
bool xfs_log_check_lsn(struct xfs_mount *, xfs_lsn_t);
diff --git a/fs/xfs/xfs_log_cil.c b/fs/xfs/xfs_log_cil.c
index 5e54e7955ea638a7c8fbbd885080fbf0005282f7..a4ab192e1792d1609e4cc309eceeefb5a71ff32f 100644
--- a/fs/xfs/xfs_log_cil.c
+++ b/fs/xfs/xfs_log_cil.c
@@ -78,6 +78,157 @@ xlog_cil_init_post_recovery(
log->l_cilp->xc_ctx->sequence = 1;
}
+static inline int
+xlog_cil_iovec_space(
+ uint niovecs)
+{
+ return round_up((sizeof(struct xfs_log_vec) +
+ niovecs * sizeof(struct xfs_log_iovec)),
+ sizeof(uint64_t));
+}
+
+/*
+ * Allocate or pin log vector buffers for CIL insertion.
+ *
+ * The CIL currently uses disposable buffers for copying a snapshot of the
+ * modified items into the log during a push. The biggest problem with this is
+ * the requirement to allocate the disposable buffer during the commit if:
+ * a) does not exist; or
+ * b) it is too small
+ *
+ * If we do this allocation within xlog_cil_insert_format_items(), it is done
+ * under the xc_ctx_lock, which means that a CIL push cannot occur during
+ * the memory allocation. This means that we have a potential deadlock situation
+ * under low memory conditions when we have lots of dirty metadata pinned in
+ * the CIL and we need a CIL commit to occur to free memory.
+ *
+ * To avoid this, we need to move the memory allocation outside the
+ * xc_ctx_lock, but because the log vector buffers are disposable, that opens
+ * up a TOCTOU race condition w.r.t. the CIL committing and removing the log
+ * vector buffers between the check and the formatting of the item into the
+ * log vector buffer within the xc_ctx_lock.
+ *
+ * Because the log vector buffer needs to be unchanged during the CIL push
+ * process, we cannot share the buffer between the transaction commit (which
+ * modifies the buffer) and the CIL push context that is writing the changes
+ * into the log. This means skipping preallocation of buffer space is
+ * unreliable, but we most definitely do not want to be allocating and freeing
+ * buffers unnecessarily during commits when overwrites can be done safely.
+ *
+ * The simplest solution to this problem is to allocate a shadow buffer when a
+ * log item is committed for the second time, and then to only use this buffer
+ * if necessary. The buffer can remain attached to the log item until such time
+ * it is needed, and this is the buffer that is reallocated to match the size of
+ * the incoming modification. Then during the formatting of the item we can swap
+ * the active buffer with the new one if we can't reuse the existing buffer. We
+ * don't free the old buffer as it may be reused on the next modification if
+ * it's size is right, otherwise we'll free and reallocate it at that point.
+ *
+ * This function builds a vector for the changes in each log item in the
+ * transaction. It then works out the length of the buffer needed for each log
+ * item, allocates them and attaches the vector to the log item in preparation
+ * for the formatting step which occurs under the xc_ctx_lock.
+ *
+ * While this means the memory footprint goes up, it avoids the repeated
+ * alloc/free pattern that repeated modifications of an item would otherwise
+ * cause, and hence minimises the CPU overhead of such behaviour.
+ */
+static void
+xlog_cil_alloc_shadow_bufs(
+ struct xlog *log,
+ struct xfs_trans *tp)
+{
+ struct xfs_log_item_desc *lidp;
+
+ list_for_each_entry(lidp, &tp->t_items, lid_trans) {
+ struct xfs_log_item *lip = lidp->lid_item;
+ struct xfs_log_vec *lv;
+ int niovecs = 0;
+ int nbytes = 0;
+ int buf_size;
+ bool ordered = false;
+
+ /* Skip items which aren't dirty in this transaction. */
+ if (!(lidp->lid_flags & XFS_LID_DIRTY))
+ continue;
+
+ /* get number of vecs and size of data to be stored */
+ lip->li_ops->iop_size(lip, &niovecs, &nbytes);
+
+ /*
+ * Ordered items need to be tracked but we do not wish to write
+ * them. We need a logvec to track the object, but we do not
+ * need an iovec or buffer to be allocated for copying data.
+ */
+ if (niovecs == XFS_LOG_VEC_ORDERED) {
+ ordered = true;
+ niovecs = 0;
+ nbytes = 0;
+ }
+
+ /*
+ * We 64-bit align the length of each iovec so that the start
+ * of the next one is naturally aligned. We'll need to
+ * account for that slack space here. Then round nbytes up
+ * to 64-bit alignment so that the initial buffer alignment is
+ * easy to calculate and verify.
+ */
+ nbytes += niovecs * sizeof(uint64_t);
+ nbytes = round_up(nbytes, sizeof(uint64_t));
+
+ /*
+ * The data buffer needs to start 64-bit aligned, so round up
+ * that space to ensure we can align it appropriately and not
+ * overrun the buffer.
+ */
+ buf_size = nbytes + xlog_cil_iovec_space(niovecs);
+
+ /*
+ * if we have no shadow buffer, or it is too small, we need to
+ * reallocate it.
+ */
+ if (!lip->li_lv_shadow ||
+ buf_size > lip->li_lv_shadow->lv_size) {
+
+ /*
+ * We free and allocate here as a realloc would copy
+ * unecessary data. We don't use kmem_zalloc() for the
+ * same reason - we don't need to zero the data area in
+ * the buffer, only the log vector header and the iovec
+ * storage.
+ */
+ kmem_free(lip->li_lv_shadow);
+
+ lv = kmem_alloc(buf_size, KM_SLEEP|KM_NOFS);
+ memset(lv, 0, xlog_cil_iovec_space(niovecs));
+
+ lv->lv_item = lip;
+ lv->lv_size = buf_size;
+ if (ordered)
+ lv->lv_buf_len = XFS_LOG_VEC_ORDERED;
+ else
+ lv->lv_iovecp = (struct xfs_log_iovec *)&lv[1];
+ lip->li_lv_shadow = lv;
+ } else {
+ /* same or smaller, optimise common overwrite case */
+ lv = lip->li_lv_shadow;
+ if (ordered)
+ lv->lv_buf_len = XFS_LOG_VEC_ORDERED;
+ else
+ lv->lv_buf_len = 0;
+ lv->lv_bytes = 0;
+ lv->lv_next = NULL;
+ }
+
+ /* Ensure the lv is set up according to ->iop_size */
+ lv->lv_niovecs = niovecs;
+
+ /* The allocated data region lies beyond the iovec region */
+ lv->lv_buf = (char *)lv + xlog_cil_iovec_space(niovecs);
+ }
+
+}
+
/*
* Prepare the log item for insertion into the CIL. Calculate the difference in
* log space and vectors it will consume, and if it is a new item pin it as
@@ -100,16 +251,19 @@ xfs_cil_prepare_item(
/*
* If there is no old LV, this is the first time we've seen the item in
* this CIL context and so we need to pin it. If we are replacing the
- * old_lv, then remove the space it accounts for and free it.
+ * old_lv, then remove the space it accounts for and make it the shadow
+ * buffer for later freeing. In both cases we are now switching to the
+ * shadow buffer, so update the the pointer to it appropriately.
*/
- if (!old_lv)
+ if (!old_lv) {
lv->lv_item->li_ops->iop_pin(lv->lv_item);
- else if (old_lv != lv) {
+ lv->lv_item->li_lv_shadow = NULL;
+ } else if (old_lv != lv) {
ASSERT(lv->lv_buf_len != XFS_LOG_VEC_ORDERED);
*diff_len -= old_lv->lv_bytes;
*diff_iovecs -= old_lv->lv_niovecs;
- kmem_free(old_lv);
+ lv->lv_item->li_lv_shadow = old_lv;
}
/* attach new log vector to log item */
@@ -133,11 +287,13 @@ xfs_cil_prepare_item(
* write it out asynchronously without needing to relock the object that was
* modified at the time it gets written into the iclog.
*
- * This function builds a vector for the changes in each log item in the
- * transaction. It then works out the length of the buffer needed for each log
- * item, allocates them and formats the vector for the item into the buffer.
- * The buffer is then attached to the log item are then inserted into the
- * Committed Item List for tracking until the next checkpoint is written out.
+ * This function takes the prepared log vectors attached to each log item, and
+ * formats the changes into the log vector buffer. The buffer it uses is
+ * dependent on the current state of the vector in the CIL - the shadow lv is
+ * guaranteed to be large enough for the current modification, but we will only
+ * use that if we can't reuse the existing lv. If we can't reuse the existing
+ * lv, then simple swap it out for the shadow lv. We don't free it - that is
+ * done lazily either by th enext modification or the freeing of the log item.
*
* We don't set up region headers during this process; we simply copy the
* regions into the flat buffer. We can do this because we still have to do a
@@ -170,59 +326,29 @@ xlog_cil_insert_format_items(
list_for_each_entry(lidp, &tp->t_items, lid_trans) {
struct xfs_log_item *lip = lidp->lid_item;
struct xfs_log_vec *lv;
- struct xfs_log_vec *old_lv;
- int niovecs = 0;
- int nbytes = 0;
- int buf_size;
+ struct xfs_log_vec *old_lv = NULL;
+ struct xfs_log_vec *shadow;
bool ordered = false;
/* Skip items which aren't dirty in this transaction. */
if (!(lidp->lid_flags & XFS_LID_DIRTY))
continue;
- /* get number of vecs and size of data to be stored */
- lip->li_ops->iop_size(lip, &niovecs, &nbytes);
-
- /* Skip items that do not have any vectors for writing */
- if (!niovecs)
- continue;
-
/*
- * Ordered items need to be tracked but we do not wish to write
- * them. We need a logvec to track the object, but we do not
- * need an iovec or buffer to be allocated for copying data.
+ * The formatting size information is already attached to
+ * the shadow lv on the log item.
*/
- if (niovecs == XFS_LOG_VEC_ORDERED) {
+ shadow = lip->li_lv_shadow;
+ if (shadow->lv_buf_len == XFS_LOG_VEC_ORDERED)
ordered = true;
- niovecs = 0;
- nbytes = 0;
- }
- /*
- * We 64-bit align the length of each iovec so that the start
- * of the next one is naturally aligned. We'll need to
- * account for that slack space here. Then round nbytes up
- * to 64-bit alignment so that the initial buffer alignment is
- * easy to calculate and verify.
- */
- nbytes += niovecs * sizeof(uint64_t);
- nbytes = round_up(nbytes, sizeof(uint64_t));
-
- /* grab the old item if it exists for reservation accounting */
- old_lv = lip->li_lv;
-
- /*
- * The data buffer needs to start 64-bit aligned, so round up
- * that space to ensure we can align it appropriately and not
- * overrun the buffer.
- */
- buf_size = nbytes +
- round_up((sizeof(struct xfs_log_vec) +
- niovecs * sizeof(struct xfs_log_iovec)),
- sizeof(uint64_t));
+ /* Skip items that do not have any vectors for writing */
+ if (!shadow->lv_niovecs && !ordered)
+ continue;
/* compare to existing item size */
- if (lip->li_lv && buf_size <= lip->li_lv->lv_size) {
+ old_lv = lip->li_lv;
+ if (lip->li_lv && shadow->lv_size <= lip->li_lv->lv_size) {
/* same or smaller, optimise common overwrite case */
lv = lip->li_lv;
lv->lv_next = NULL;
@@ -236,32 +362,29 @@ xlog_cil_insert_format_items(
*/
*diff_iovecs -= lv->lv_niovecs;
*diff_len -= lv->lv_bytes;
+
+ /* Ensure the lv is set up according to ->iop_size */
+ lv->lv_niovecs = shadow->lv_niovecs;
+
+ /* reset the lv buffer information for new formatting */
+ lv->lv_buf_len = 0;
+ lv->lv_bytes = 0;
+ lv->lv_buf = (char *)lv +
+ xlog_cil_iovec_space(lv->lv_niovecs);
} else {
- /* allocate new data chunk */
- lv = kmem_zalloc(buf_size, KM_SLEEP|KM_NOFS);
+ /* switch to shadow buffer! */
+ lv = shadow;
lv->lv_item = lip;
- lv->lv_size = buf_size;
if (ordered) {
/* track as an ordered logvec */
ASSERT(lip->li_lv == NULL);
- lv->lv_buf_len = XFS_LOG_VEC_ORDERED;
goto insert;
}
- lv->lv_iovecp = (struct xfs_log_iovec *)&lv[1];
}
- /* Ensure the lv is set up according to ->iop_size */
- lv->lv_niovecs = niovecs;
-
- /* The allocated data region lies beyond the iovec region */
- lv->lv_buf_len = 0;
- lv->lv_bytes = 0;
- lv->lv_buf = (char *)lv + buf_size - nbytes;
ASSERT(IS_ALIGNED((unsigned long)lv->lv_buf, sizeof(uint64_t)));
-
lip->li_ops->iop_format(lip, lv);
insert:
- ASSERT(lv->lv_buf_len <= nbytes);
xfs_cil_prepare_item(log, lv, old_lv, diff_len, diff_iovecs);
}
}
@@ -783,6 +906,13 @@ xfs_log_commit_cil(
struct xlog *log = mp->m_log;
struct xfs_cil *cil = log->l_cilp;
+ /*
+ * Do all necessary memory allocation before we lock the CIL.
+ * This ensures the allocation does not deadlock with a CIL
+ * push in memory reclaim (e.g. from kswapd).
+ */
+ xlog_cil_alloc_shadow_bufs(log, tp);
+
/* lock out background commit */
down_read(&cil->xc_ctx_lock);
diff --git a/fs/xfs/xfs_mount.c b/fs/xfs/xfs_mount.c
index e39b02351b4a257e92f9e2506a8af8f31aecc688..970c19ba2f560f62bc077d6797c6713848dcd5ec 100644
--- a/fs/xfs/xfs_mount.c
+++ b/fs/xfs/xfs_mount.c
@@ -272,13 +272,15 @@ xfs_readsb(
buf_ops = NULL;
/*
- * Allocate a (locked) buffer to hold the superblock.
- * This will be kept around at all times to optimize
- * access to the superblock.
+ * Allocate a (locked) buffer to hold the superblock. This will be kept
+ * around at all times to optimize access to the superblock. Therefore,
+ * set XBF_NO_IOACCT to make sure it doesn't hold the buftarg count
+ * elevated.
*/
reread:
error = xfs_buf_read_uncached(mp->m_ddev_targp, XFS_SB_DADDR,
- BTOBB(sector_size), 0, &bp, buf_ops);
+ BTOBB(sector_size), XBF_NO_IOACCT, &bp,
+ buf_ops);
if (error) {
if (loud)
xfs_warn(mp, "SB validate failed with error %d.", error);
diff --git a/fs/xfs/xfs_ondisk.h b/fs/xfs/xfs_ondisk.h
index 184c44effdd5a3bd107d1369c9b2873367951980..0cc8d8f74356759917f778d02d1e9a79888dd1f6 100644
--- a/fs/xfs/xfs_ondisk.h
+++ b/fs/xfs/xfs_ondisk.h
@@ -22,6 +22,11 @@
BUILD_BUG_ON_MSG(sizeof(structname) != (size), "XFS: sizeof(" \
#structname ") is wrong, expected " #size)
+#define XFS_CHECK_OFFSET(structname, member, off) \
+ BUILD_BUG_ON_MSG(offsetof(structname, member) != (off), \
+ "XFS: offsetof(" #structname ", " #member ") is wrong, " \
+ "expected " #off)
+
static inline void __init
xfs_check_ondisk_structs(void)
{
@@ -34,6 +39,8 @@ xfs_check_ondisk_structs(void)
XFS_CHECK_STRUCT_SIZE(struct xfs_bmbt_key, 8);
XFS_CHECK_STRUCT_SIZE(struct xfs_bmbt_rec, 16);
XFS_CHECK_STRUCT_SIZE(struct xfs_bmdr_block, 4);
+ XFS_CHECK_STRUCT_SIZE(struct xfs_btree_block_shdr, 48);
+ XFS_CHECK_STRUCT_SIZE(struct xfs_btree_block_lhdr, 64);
XFS_CHECK_STRUCT_SIZE(struct xfs_btree_block, 72);
XFS_CHECK_STRUCT_SIZE(struct xfs_dinode, 176);
XFS_CHECK_STRUCT_SIZE(struct xfs_disk_dquot, 104);
@@ -75,27 +82,39 @@ xfs_check_ondisk_structs(void)
XFS_CHECK_STRUCT_SIZE(xfs_attr_leaf_name_remote_t, 12);
*/
+ XFS_CHECK_OFFSET(xfs_attr_leaf_name_local_t, valuelen, 0);
+ XFS_CHECK_OFFSET(xfs_attr_leaf_name_local_t, namelen, 2);
+ XFS_CHECK_OFFSET(xfs_attr_leaf_name_local_t, nameval, 3);
+ XFS_CHECK_OFFSET(xfs_attr_leaf_name_remote_t, valueblk, 0);
+ XFS_CHECK_OFFSET(xfs_attr_leaf_name_remote_t, valuelen, 4);
+ XFS_CHECK_OFFSET(xfs_attr_leaf_name_remote_t, namelen, 8);
+ XFS_CHECK_OFFSET(xfs_attr_leaf_name_remote_t, name, 9);
XFS_CHECK_STRUCT_SIZE(xfs_attr_leafblock_t, 40);
- XFS_CHECK_STRUCT_SIZE(xfs_attr_shortform_t, 8);
+ XFS_CHECK_OFFSET(xfs_attr_shortform_t, hdr.totsize, 0);
+ XFS_CHECK_OFFSET(xfs_attr_shortform_t, hdr.count, 2);
+ XFS_CHECK_OFFSET(xfs_attr_shortform_t, list[0].namelen, 4);
+ XFS_CHECK_OFFSET(xfs_attr_shortform_t, list[0].valuelen, 5);
+ XFS_CHECK_OFFSET(xfs_attr_shortform_t, list[0].flags, 6);
+ XFS_CHECK_OFFSET(xfs_attr_shortform_t, list[0].nameval, 7);
XFS_CHECK_STRUCT_SIZE(xfs_da_blkinfo_t, 12);
XFS_CHECK_STRUCT_SIZE(xfs_da_intnode_t, 16);
XFS_CHECK_STRUCT_SIZE(xfs_da_node_entry_t, 8);
XFS_CHECK_STRUCT_SIZE(xfs_da_node_hdr_t, 16);
XFS_CHECK_STRUCT_SIZE(xfs_dir2_data_free_t, 4);
XFS_CHECK_STRUCT_SIZE(xfs_dir2_data_hdr_t, 16);
- XFS_CHECK_STRUCT_SIZE(xfs_dir2_data_unused_t, 6);
+ XFS_CHECK_OFFSET(xfs_dir2_data_unused_t, freetag, 0);
+ XFS_CHECK_OFFSET(xfs_dir2_data_unused_t, length, 2);
XFS_CHECK_STRUCT_SIZE(xfs_dir2_free_hdr_t, 16);
XFS_CHECK_STRUCT_SIZE(xfs_dir2_free_t, 16);
- XFS_CHECK_STRUCT_SIZE(xfs_dir2_ino4_t, 4);
- XFS_CHECK_STRUCT_SIZE(xfs_dir2_ino8_t, 8);
- XFS_CHECK_STRUCT_SIZE(xfs_dir2_inou_t, 8);
XFS_CHECK_STRUCT_SIZE(xfs_dir2_leaf_entry_t, 8);
XFS_CHECK_STRUCT_SIZE(xfs_dir2_leaf_hdr_t, 16);
XFS_CHECK_STRUCT_SIZE(xfs_dir2_leaf_t, 16);
XFS_CHECK_STRUCT_SIZE(xfs_dir2_leaf_tail_t, 4);
XFS_CHECK_STRUCT_SIZE(xfs_dir2_sf_entry_t, 3);
+ XFS_CHECK_OFFSET(xfs_dir2_sf_entry_t, namelen, 0);
+ XFS_CHECK_OFFSET(xfs_dir2_sf_entry_t, offset, 1);
+ XFS_CHECK_OFFSET(xfs_dir2_sf_entry_t, name, 3);
XFS_CHECK_STRUCT_SIZE(xfs_dir2_sf_hdr_t, 10);
- XFS_CHECK_STRUCT_SIZE(xfs_dir2_sf_off_t, 2);
/* log structures */
XFS_CHECK_STRUCT_SIZE(struct xfs_dq_logformat, 24);
diff --git a/fs/xfs/xfs_pnfs.c b/fs/xfs/xfs_pnfs.c
index d5b756669fb5f43763b1b634b1348a5d52941743..0f14b2e4bf6cb03b803ff42abbf1c026fc74c70d 100644
--- a/fs/xfs/xfs_pnfs.c
+++ b/fs/xfs/xfs_pnfs.c
@@ -1,6 +1,7 @@
/*
* Copyright (c) 2014 Christoph Hellwig.
*/
+#include <linux/iomap.h>
#include "xfs.h"
#include "xfs_format.h"
#include "xfs_log_format.h"
@@ -79,32 +80,6 @@ xfs_fs_get_uuid(
return 0;
}
-static void
-xfs_bmbt_to_iomap(
- struct xfs_inode *ip,
- struct iomap *iomap,
- struct xfs_bmbt_irec *imap)
-{
- struct xfs_mount *mp = ip->i_mount;
-
- if (imap->br_startblock == HOLESTARTBLOCK) {
- iomap->blkno = IOMAP_NULL_BLOCK;
- iomap->type = IOMAP_HOLE;
- } else if (imap->br_startblock == DELAYSTARTBLOCK) {
- iomap->blkno = IOMAP_NULL_BLOCK;
- iomap->type = IOMAP_DELALLOC;
- } else {
- iomap->blkno =
- XFS_FSB_TO_DADDR(ip->i_mount, imap->br_startblock);
- if (imap->br_state == XFS_EXT_UNWRITTEN)
- iomap->type = IOMAP_UNWRITTEN;
- else
- iomap->type = IOMAP_MAPPED;
- }
- iomap->offset = XFS_FSB_TO_B(mp, imap->br_startoff);
- iomap->length = XFS_FSB_TO_B(mp, imap->br_blockcount);
-}
-
/*
* Get a layout for the pNFS client.
*/
diff --git a/fs/xfs/xfs_rtalloc.h b/fs/xfs/xfs_rtalloc.h
index 76c0a4a9bb170a327936d1719c8cc9fa736de324..355dd9e1cb64174b7f4e496b1f4d3ddf6e359c9b 100644
--- a/fs/xfs/xfs_rtalloc.h
+++ b/fs/xfs/xfs_rtalloc.h
@@ -98,8 +98,6 @@ xfs_growfs_rt(
/*
* From xfs_rtbitmap.c
*/
-int xfs_rtbuf_get(struct xfs_mount *mp, struct xfs_trans *tp,
- xfs_rtblock_t block, int issum, struct xfs_buf **bpp);
int xfs_rtcheck_range(struct xfs_mount *mp, struct xfs_trans *tp,
xfs_rtblock_t start, xfs_extlen_t len, int val,
xfs_rtblock_t *new, int *stat);
diff --git a/fs/xfs/xfs_super.c b/fs/xfs/xfs_super.c
index 11ea5d51db56715cf2815dbda8ab3577ee0fd686..0303f1005f884e0314539c94bf2a36349bc31fab 100644
--- a/fs/xfs/xfs_super.c
+++ b/fs/xfs/xfs_super.c
@@ -546,7 +546,7 @@ xfs_showargs(
return 0;
}
-__uint64_t
+static __uint64_t
xfs_max_file_offset(
unsigned int blockshift)
{
@@ -1294,6 +1294,7 @@ xfs_fs_remount(
*/
xfs_restore_resvblks(mp);
xfs_log_work_queue(mp);
+ xfs_queue_eofblocks(mp);
}
/* rw -> ro */
@@ -1306,6 +1307,13 @@ xfs_fs_remount(
* return it to the same size.
*/
xfs_save_resvblks(mp);
+
+ /*
+ * Cancel background eofb scanning so it cannot race with the
+ * final log force+buftarg wait and deadlock the remount.
+ */
+ cancel_delayed_work_sync(&mp->m_eofblocks_work);
+
xfs_quiesce_attr(mp);
mp->m_flags |= XFS_MOUNT_RDONLY;
}
@@ -1565,10 +1573,6 @@ xfs_fs_fill_super(
}
}
- if (xfs_sb_version_hassparseinodes(&mp->m_sb))
- xfs_alert(mp,
- "EXPERIMENTAL sparse inode feature enabled. Use at your own risk!");
-
error = xfs_mountfs(mp);
if (error)
goto out_filestream_unmount;
@@ -1692,8 +1696,9 @@ xfs_init_zones(void)
if (!xfs_log_ticket_zone)
goto out_free_ioend_bioset;
- xfs_bmap_free_item_zone = kmem_zone_init(sizeof(xfs_bmap_free_item_t),
- "xfs_bmap_free_item");
+ xfs_bmap_free_item_zone = kmem_zone_init(
+ sizeof(struct xfs_bmap_free_item),
+ "xfs_bmap_free_item");
if (!xfs_bmap_free_item_zone)
goto out_destroy_log_ticket_zone;
diff --git a/fs/xfs/xfs_super.h b/fs/xfs/xfs_super.h
index 2dfb1ce4585f2feee7546483021f3d7593fc29fa..529bce9fc37ef9a64c7f446c25429a4e8c2276b7 100644
--- a/fs/xfs/xfs_super.h
+++ b/fs/xfs/xfs_super.h
@@ -61,8 +61,6 @@ struct xfs_mount;
struct xfs_buftarg;
struct block_device;
-extern __uint64_t xfs_max_file_offset(unsigned int);
-
extern void xfs_flush_inodes(struct xfs_mount *mp);
extern void xfs_blkdev_issue_flush(struct xfs_buftarg *);
extern xfs_agnumber_t xfs_set_inode_alloc(struct xfs_mount *,
diff --git a/fs/xfs/xfs_sysfs.c b/fs/xfs/xfs_sysfs.c
index 4c2c5508620819ea4075fe65c1b7390a47246add..79cfd3fc53240da3577608d4f4a04f7cf1f14399 100644
--- a/fs/xfs/xfs_sysfs.c
+++ b/fs/xfs/xfs_sysfs.c
@@ -634,6 +634,9 @@ xfs_error_get_cfg(
{
struct xfs_error_cfg *cfg;
+ if (error < 0)
+ error = -error;
+
switch (error) {
case EIO:
cfg = &mp->m_error_cfg[error_class][XFS_ERR_EIO];
diff --git a/fs/xfs/xfs_trace.h b/fs/xfs/xfs_trace.h
index ea94ee0fe5ea2b8e9e089b857d82a30057e0b950..145169093fe0cfd8c04dba93bb701061f35bff63 100644
--- a/fs/xfs/xfs_trace.h
+++ b/fs/xfs/xfs_trace.h
@@ -354,6 +354,7 @@ DEFINE_BUF_EVENT(xfs_buf_submit_wait);
DEFINE_BUF_EVENT(xfs_buf_bawrite);
DEFINE_BUF_EVENT(xfs_buf_lock);
DEFINE_BUF_EVENT(xfs_buf_lock_done);
+DEFINE_BUF_EVENT(xfs_buf_trylock_fail);
DEFINE_BUF_EVENT(xfs_buf_trylock);
DEFINE_BUF_EVENT(xfs_buf_unlock);
DEFINE_BUF_EVENT(xfs_buf_iowait);
@@ -1134,15 +1135,14 @@ TRACE_EVENT(xfs_log_assign_tail_lsn,
)
DECLARE_EVENT_CLASS(xfs_file_class,
- TP_PROTO(struct xfs_inode *ip, size_t count, loff_t offset, int flags),
- TP_ARGS(ip, count, offset, flags),
+ TP_PROTO(struct xfs_inode *ip, size_t count, loff_t offset),
+ TP_ARGS(ip, count, offset),
TP_STRUCT__entry(
__field(dev_t, dev)
__field(xfs_ino_t, ino)
__field(xfs_fsize_t, size)
__field(loff_t, offset)
__field(size_t, count)
- __field(int, flags)
),
TP_fast_assign(
__entry->dev = VFS_I(ip)->i_sb->s_dev;
@@ -1150,25 +1150,25 @@ DECLARE_EVENT_CLASS(xfs_file_class,
__entry->size = ip->i_d.di_size;
__entry->offset = offset;
__entry->count = count;
- __entry->flags = flags;
),
- TP_printk("dev %d:%d ino 0x%llx size 0x%llx "
- "offset 0x%llx count 0x%zx ioflags %s",
+ TP_printk("dev %d:%d ino 0x%llx size 0x%llx offset 0x%llx count 0x%zx",
MAJOR(__entry->dev), MINOR(__entry->dev),
__entry->ino,
__entry->size,
__entry->offset,
- __entry->count,
- __print_flags(__entry->flags, "|", XFS_IO_FLAGS))
+ __entry->count)
)
#define DEFINE_RW_EVENT(name) \
DEFINE_EVENT(xfs_file_class, name, \
- TP_PROTO(struct xfs_inode *ip, size_t count, loff_t offset, int flags), \
- TP_ARGS(ip, count, offset, flags))
-DEFINE_RW_EVENT(xfs_file_read);
+ TP_PROTO(struct xfs_inode *ip, size_t count, loff_t offset), \
+ TP_ARGS(ip, count, offset))
+DEFINE_RW_EVENT(xfs_file_buffered_read);
+DEFINE_RW_EVENT(xfs_file_direct_read);
+DEFINE_RW_EVENT(xfs_file_dax_read);
DEFINE_RW_EVENT(xfs_file_buffered_write);
DEFINE_RW_EVENT(xfs_file_direct_write);
+DEFINE_RW_EVENT(xfs_file_dax_write);
DEFINE_RW_EVENT(xfs_file_splice_read);
DECLARE_EVENT_CLASS(xfs_page_class,
@@ -1295,6 +1295,9 @@ DEFINE_IOMAP_EVENT(xfs_map_blocks_alloc);
DEFINE_IOMAP_EVENT(xfs_get_blocks_found);
DEFINE_IOMAP_EVENT(xfs_get_blocks_alloc);
DEFINE_IOMAP_EVENT(xfs_get_blocks_map_direct);
+DEFINE_IOMAP_EVENT(xfs_iomap_alloc);
+DEFINE_IOMAP_EVENT(xfs_iomap_found);
+DEFINE_IOMAP_EVENT(xfs_iomap_not_found);
DECLARE_EVENT_CLASS(xfs_simple_io_class,
TP_PROTO(struct xfs_inode *ip, xfs_off_t offset, ssize_t count),
diff --git a/fs/xfs/xfs_trans.h b/fs/xfs/xfs_trans.h
index 9a462e892e4f33f9f50508b6ba8f33bfb348a420..9b2b9fa89331c10d57818218ccd8fc985a3325f6 100644
--- a/fs/xfs/xfs_trans.h
+++ b/fs/xfs/xfs_trans.h
@@ -52,6 +52,7 @@ typedef struct xfs_log_item {
/* delayed logging */
struct list_head li_cil; /* CIL pointers */
struct xfs_log_vec *li_lv; /* active log vector */
+ struct xfs_log_vec *li_lv_shadow; /* standby vector */
xfs_lsn_t li_seq; /* CIL commit seq */
} xfs_log_item_t;
diff --git a/include/linux/exportfs.h b/include/linux/exportfs.h
index d8414502edb4db8e19a5e94c544b38d6cec746f3..b03c0625fa6ec348327385cfbc730dd292ef81cc 100644
--- a/include/linux/exportfs.h
+++ b/include/linux/exportfs.h
@@ -6,6 +6,7 @@
struct dentry;
struct iattr;
struct inode;
+struct iomap;
struct super_block;
struct vfsmount;
@@ -187,21 +188,6 @@ struct fid {
* get_name is not (which is possibly inconsistent)
*/
-/* types of block ranges for multipage write mappings. */
-#define IOMAP_HOLE 0x01 /* no blocks allocated, need allocation */
-#define IOMAP_DELALLOC 0x02 /* delayed allocation blocks */
-#define IOMAP_MAPPED 0x03 /* blocks allocated @blkno */
-#define IOMAP_UNWRITTEN 0x04 /* blocks allocated @blkno in unwritten state */
-
-#define IOMAP_NULL_BLOCK -1LL /* blkno is not valid */
-
-struct iomap {
- sector_t blkno; /* first sector of mapping */
- loff_t offset; /* file offset of mapping, bytes */
- u64 length; /* length of mapping, bytes */
- int type; /* type of mapping */
-};
-
struct export_operations {
int (*encode_fh)(struct inode *inode, __u32 *fh, int *max_len,
struct inode *parent);
diff --git a/include/linux/iomap.h b/include/linux/iomap.h
new file mode 100644
index 0000000000000000000000000000000000000000..3267df4610125600f7e441a53a7a0fe583d2ddc1
--- /dev/null
+++ b/include/linux/iomap.h
@@ -0,0 +1,70 @@
+#ifndef LINUX_IOMAP_H
+#define LINUX_IOMAP_H 1
+
+#include <linux/types.h>
+
+struct fiemap_extent_info;
+struct inode;
+struct iov_iter;
+struct kiocb;
+struct vm_area_struct;
+struct vm_fault;
+
+/*
+ * Types of block ranges for iomap mappings:
+ */
+#define IOMAP_HOLE 0x01 /* no blocks allocated, need allocation */
+#define IOMAP_DELALLOC 0x02 /* delayed allocation blocks */
+#define IOMAP_MAPPED 0x03 /* blocks allocated @blkno */
+#define IOMAP_UNWRITTEN 0x04 /* blocks allocated @blkno in unwritten state */
+
+/*
+ * Magic value for blkno:
+ */
+#define IOMAP_NULL_BLOCK -1LL /* blkno is not valid */
+
+struct iomap {
+ sector_t blkno; /* 1st sector of mapping, 512b units */
+ loff_t offset; /* file offset of mapping, bytes */
+ u64 length; /* length of mapping, bytes */
+ int type; /* type of mapping */
+ struct block_device *bdev; /* block device for I/O */
+};
+
+/*
+ * Flags for iomap_begin / iomap_end. No flag implies a read.
+ */
+#define IOMAP_WRITE (1 << 0)
+#define IOMAP_ZERO (1 << 1)
+
+struct iomap_ops {
+ /*
+ * Return the existing mapping at pos, or reserve space starting at
+ * pos for up to length, as long as we can do it as a single mapping.
+ * The actual length is returned in iomap->length.
+ */
+ int (*iomap_begin)(struct inode *inode, loff_t pos, loff_t length,
+ unsigned flags, struct iomap *iomap);
+
+ /*
+ * Commit and/or unreserve space previous allocated using iomap_begin.
+ * Written indicates the length of the successful write operation which
+ * needs to be commited, while the rest needs to be unreserved.
+ * Written might be zero if no data was written.
+ */
+ int (*iomap_end)(struct inode *inode, loff_t pos, loff_t length,
+ ssize_t written, unsigned flags, struct iomap *iomap);
+};
+
+ssize_t iomap_file_buffered_write(struct kiocb *iocb, struct iov_iter *from,
+ struct iomap_ops *ops);
+int iomap_zero_range(struct inode *inode, loff_t pos, loff_t len,
+ bool *did_zero, struct iomap_ops *ops);
+int iomap_truncate_page(struct inode *inode, loff_t pos, bool *did_zero,
+ struct iomap_ops *ops);
+int iomap_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf,
+ struct iomap_ops *ops);
+int iomap_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo,
+ loff_t start, loff_t len, struct iomap_ops *ops);
+
+#endif /* LINUX_IOMAP_H */