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xfs: make iomap_begin functions trim iomaps consistently 

Historically, the XFS iomap_begin function only returned mappings for
exactly the range queried, i.e. it doesn't do XFS_BMAPI_ENTIRE lookups.
The current vfs iomap consumers are only set up to deal with trimmed
mappings.  xfs_xattr_iomap_begin does BMAPI_ENTIRE lookups, which is
inconsistent with the current iomap usage.  Remove the flag so that both
iomap_begin functions behave the same way.

FWIW this also fixes a behavioral regression in xattr FIEMAP that was
introduced in 4.8 wherein attr fork extents are no longer trimmed like
they used to be.

Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
This commit is contained in:
Darrick J. Wong 2017-12-06 16:13:35 -08:00
parent f59cf5c299
commit b7e0b6ff54
1 changed files with 1 additions and 1 deletions
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2
fs/xfs/xfs_iomap.c
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@ -1213,7 +1213,7 @@ xfs_xattr_iomap_begin(
ASSERT(ip->i_d.di_aformat != XFS_DINODE_FMT_LOCAL);
error = xfs_bmapi_read(ip, offset_fsb, end_fsb - offset_fsb, &imap,
&nimaps, XFS_BMAPI_ENTIRE | XFS_BMAPI_ATTRFORK);
&nimaps, XFS_BMAPI_ATTRFORK);
out_unlock:
xfs_iunlock(ip, lockmode);