[XFS updates] XFS development tree branch, for-next, updated. v3.12-rc1-5-g997def2

xfs
2013-09-27T14:19:02Z

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997def2 xfs: fix node forward in xfs_node_toosmall
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- Log -----------------------------------------------------------------
commit 997def25e4b9cee3b01609e18a52f926bca8bd2b
Author: Mark Tinguely <tinguely@sgi.com>
Date: Mon Sep 23 12:18:58 2013 -0500

xfs: fix node forward in xfs_node_toosmall

Commit f5ea1100 cleans up the disk to host conversions for
node directory entries, but because a variable is reused in
xfs_node_toosmall() the next node is not correctly found.
If the original node is small enough (<= 3/8 of the node size),
this change may incorrectly cause a node collapse when it should
not. That will cause an assert in xfstest generic/319:

Assertion failed: first <= last && last < BBTOB(bp->b_length),
file: /root/newest/xfs/fs/xfs/xfs_trans_buf.c, line: 569

Keep the original node header to get the correct forward node.

(When a node is considered for a merge with a sibling, it overwrites the
sibling pointers of the original incore nodehdr with the sibling's
pointers. This leads to loop considering the original node as a merge
candidate with itself in the second pass, and so it incorrectly
determines a merge should occur.)

Signed-off-by: Mark Tinguely <tinguely@sgi.com>
Reviewed-by: Ben Myers <bpm@sgi.com>
Signed-off-by: Ben Myers <bpm@sgi.com>

[v3: added Dave Chinner's (slightly modified) suggestion to the commit header,
cleaned up whitespace. -bpm]

-----------------------------------------------------------------------

Summary of changes:
fs/xfs/xfs_da_btree.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)

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