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btrfs: Fix a data space underflow warning 

Even with quota disabled, generic/127 will trigger a kernel warning by
underflow data space info.

The bug is caused by buffered write, which in case of short copy, the
start parameter for btrfs_delalloc_release_space() is wrong, and
round_up/down() in btrfs_delalloc_release() extents the range to page
aligned, decreasing one more page than expected.

This patch will fix it by passing correct start.

Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Qu Wenruo 2015-10-29 17:28:46 +08:00 committed by Chris Mason
parent 90ce321da8
commit 485290a734
1 changed files with 8 additions and 3 deletions
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11
fs/btrfs/file.c
View File

@ -1604,12 +1604,17 @@ again:
BTRFS_I(inode)->outstanding_extents++;
spin_unlock(&BTRFS_I(inode)->lock);
}
if (only_release_metadata)
if (only_release_metadata) {
btrfs_delalloc_release_metadata(inode,
release_bytes);
else
btrfs_delalloc_release_space(inode, pos,
} else {
u64 __pos;
__pos = round_down(pos, root->sectorsize) +
(dirty_pages << PAGE_CACHE_SHIFT);
btrfs_delalloc_release_space(inode, __pos,
release_bytes);
}
}
release_bytes = dirty_pages << PAGE_CACHE_SHIFT;