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[XFS] xfs_bmap_compute_maxlevels should be based on di_forkoff 

Fix up xfs_bmap_compute_maxlevels() to account for the case when we go
from using attr2 to using attr1. In that case attr1 will no longer
necessarily be at m_attr_offset>>3, but could be at a different value for
di_forkoff. Therefore, we return the worst case scenario using MINDBTPTRS
and MINABTPTRS, as this function is used for determining the maximum log
space.

SGI-PV: 979606
SGI-Modid: xfs-linux-melb:xfs-kern:30862a

Signed-off-by: Tim Shimmin <tes@sgi.com>
Signed-off-by: Eric Sandeen <sandeen@sandeen.net>
Signed-off-by: Lachlan McIlroy <lachlan@sgi.com>
This commit is contained in:
Tim Shimmin 2008-04-17 16:50:16 +10:00 committed by Lachlan McIlroy
parent cb49dbb130
commit 6d1337b29b
1 changed files with 10 additions and 5 deletions
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15
fs/xfs/xfs_bmap.c
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@ -4153,16 +4153,21 @@ xfs_bmap_compute_maxlevels(
* number of leaf entries, is controlled by the type of di_nextents
* (a signed 32-bit number, xfs_extnum_t), or by di_anextents
* (a signed 16-bit number, xfs_aextnum_t).
*
* Note that we can no longer assume that if we are in ATTR1 that
* the fork offset of all the inodes will be (m_attroffset >> 3)
* because we could have mounted with ATTR2 and then mounted back
* with ATTR1, keeping the di_forkoff's fixed but probably at
* various positions. Therefore, for both ATTR1 and ATTR2
* we have to assume the worst case scenario of a minimum size
* available.
*/
if (whichfork == XFS_DATA_FORK) {
maxleafents = MAXEXTNUM;
sz = (mp->m_flags & XFS_MOUNT_ATTR2) ?
XFS_BMDR_SPACE_CALC(MINDBTPTRS) : mp->m_attroffset;
sz = XFS_BMDR_SPACE_CALC(MINDBTPTRS);
} else {
maxleafents = MAXAEXTNUM;
sz = (mp->m_flags & XFS_MOUNT_ATTR2) ?
XFS_BMDR_SPACE_CALC(MINABTPTRS) :
mp->m_sb.sb_inodesize - mp->m_attroffset;
sz = XFS_BMDR_SPACE_CALC(MINABTPTRS);
}
maxrootrecs = (int)XFS_BTREE_BLOCK_MAXRECS(sz, xfs_bmdr, 0);
minleafrecs = mp->m_bmap_dmnr[0];