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xfs: reduce bmv_count in xfs_vn_fiemap

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commit 6321e3ed2a caused
the full bmv_count's worth of getbmapx structures to get
allocated; telling it to do MAXEXTNUM was a bit insane,
resulting in ENOMEM every time.

Chop it down to something reasonable, the number of slots
in the caller's input buffer.  If this is too large the
caller may get ENOMEM but the reason should not be a
mystery, and they can try again with something smaller.

We add 1 to the value because in the normal getbmap
world, bmv_count includes the header and xfs_getbmap does:

        nex = bmv->bmv_count - 1;
        if (nex <= 0)
                return XFS_ERROR(EINVAL);

Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
Reviewed-by: Olaf Weber <olaf@sgi.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Felix Blyakher <felixb@sgi.com>
This commit is contained in:
Eric Sandeen 2009-07-26 21:52:01 -05:00 committed by Felix Blyakher
parent fd40261354
commit 97db39a1f6
1 changed files with 2 additions and 2 deletions
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4
fs/xfs/linux-2.6/xfs_iops.c
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@ -680,8 +680,8 @@ xfs_vn_fiemap(
else
bm.bmv_length = BTOBB(length);
/* our formatter will tell xfs_getbmap when to stop. */
bm.bmv_count = MAXEXTNUM;
/* We add one because in getbmap world count includes the header */
bm.bmv_count = fieinfo->fi_extents_max + 1;
bm.bmv_iflags = BMV_IF_PREALLOC;
if (fieinfo->fi_flags & FIEMAP_FLAG_XATTR)
bm.bmv_iflags |= BMV_IF_ATTRFORK;