diff options
| author | Tao Ma <tao.ma@oracle.com> | 2010-04-29 15:13:56 +1000 |
|---|---|---|
| committer | Alex Elder <aelder@sgi.com> | 2010-05-19 09:58:16 -0500 |
| commit | 2d1ff3c75a4642062d314634290be6d8da4ffb03 (patch) | |
| tree | 1112feee61ad0c7653c6877d04397b4949c46471 | |
| parent | 48389ef17583f2214bbd2c119b3015677419c16b (diff) | |
xfs: Make fiemap work in query mode.
According to Documentation/filesystems/fiemap.txt, If fm_extent_count
is zero, then the fm_extents[] array is ignored (no extents will be
returned), and the fm_mapped_extents count will hold the number of
extents needed.
But as the commit 97db39a1f6f69e906e98118392400de5217aa33a has changed
bmv_count to the caller's input buffer, this number query function can't
work any more. As this commit is written to change bmv_count from
MAXEXTNUM because of ENOMEM.
This patch just try to set bm.bmv_count to something sane.
Thanks to Dave Chinner <david@fromorbit.com> for the suggestion.
Cc: Eric Sandeen <sandeen@redhat.com>
Cc: Alex Elder <aelder@sgi.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Tao Ma <tao.ma@oracle.com>
| -rw-r--r-- | fs/xfs/linux-2.6/xfs_iops.c | 5 |
1 files changed, 4 insertions, 1 deletions
diff --git a/fs/xfs/linux-2.6/xfs_iops.c b/fs/xfs/linux-2.6/xfs_iops.c index e65a7937f3a..9c8019c78c9 100644 --- a/fs/xfs/linux-2.6/xfs_iops.c +++ b/fs/xfs/linux-2.6/xfs_iops.c @@ -673,7 +673,10 @@ xfs_vn_fiemap( bm.bmv_length = BTOBB(length); /* We add one because in getbmap world count includes the header */ - bm.bmv_count = fieinfo->fi_extents_max + 1; + 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; if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR) bm.bmv_iflags |= BMV_IF_ATTRFORK; |