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xfs: make rtbitmap ILOCKing consistent when scanning the rt bitmap file

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xfs_rtalloc_query_range scans the realtime bitmap file in order of
increasing file offset, so this caller can take ILOCK_SHARED on the rt
bitmap inode instead of ILOCK_EXCL.  This isn't going to yield any
practical benefits at mount time, but we'd like to make the locking
usage consistent around xfs_rtalloc_query_all calls.  Make all the
places we do this use the same xfs_ilock lockflags for consistency.

Fixes: 4c934c7dd6 ("xfs: report realtime space information via the rtbitmap")
Signed-off-by: Darrick J. Wong <djwong@kernel.org>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
This commit is contained in:
Darrick J. Wong 2022-11-06 17:03:18 -08:00
parent 9e13975bb0
commit 5f369dc5b4
2 changed files with 4 additions and 4 deletions
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4
fs/xfs/xfs_fsmap.c
View file

@ -524,7 +524,7 @@ xfs_getfsmap_rtdev_rtbitmap_query(
struct xfs_mount *mp = tp->t_mountp;
int error;
xfs_ilock(mp->m_rbmip, XFS_ILOCK_SHARED);
xfs_ilock(mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP);
/*
* Set up query parameters to return free rtextents covering the range
@ -551,7 +551,7 @@ xfs_getfsmap_rtdev_rtbitmap_query(
if (error)
goto err;
err:
xfs_iunlock(mp->m_rbmip, XFS_ILOCK_SHARED);
xfs_iunlock(mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP);
return error;
}

4
fs/xfs/xfs_rtalloc.c
View file

@ -1311,10 +1311,10 @@ xfs_rtalloc_reinit_frextents(
uint64_t val = 0;
int error;
xfs_ilock(mp->m_rbmip, XFS_ILOCK_EXCL);
xfs_ilock(mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP);
error = xfs_rtalloc_query_all(mp, NULL, xfs_rtalloc_count_frextent,
&val);
xfs_iunlock(mp->m_rbmip, XFS_ILOCK_EXCL);
xfs_iunlock(mp->m_rbmip, XFS_ILOCK_SHARED | XFS_ILOCK_RTBITMAP);
if (error)
return error;