xfs: use b_maps[] for discontiguous buffers

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Commits starting at 77c1a08 introduced a multiple segment support
to xfs_buf. xfs_trans_buf_item_match() could not find a multi-segment
buffer in the transaction because it was looking at the single segment
block number rather than the multi-segment b_maps[0].bm.bn. This
results on a recursive buffer lock that can never be satisfied.

This patch:
 1) Changed the remaining b_map accesses to be b_maps[0] accesses.
 2) Renames the single segment b_map structure to __b_map to avoid
    future confusion.

Signed-off-by: Mark Tinguely <tinguely@sgi.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ben Myers <bpm@sgi.com>

...

This commit is contained in:

Mark Tinguely 2012-12-04 17:18:02 -06:00 • committed by Ben Myers

parent f9668a09e3

commit f4b42421d8

2 changed files with 9 additions and 9 deletions

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12

fs/xfs/xfs_buf.c

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6

fs/xfs/xfs_buf.h

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