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xfs: fix segment in xfs_buf_item_format_segment 

Not every segment in a multi-segment buffer is dirty in a
transaction and they will not be outputted. The assert in
xfs_buf_item_format_segment() that checks for the at least
one chunk of data in the segment to be used is not necessary
true for multi-segmented buffers.

Signed-off-by: Mark Tinguely <tinguely@sgi.com>
Reviewed-by: Dave Chinner <dchinner@redhat.com>
Signed-off-by: Ben Myers <bpm@sgi.com>
This commit is contained in:
Mark Tinguely 2012-12-04 17:18:04 -06:00 committed by Ben Myers
parent 0f22f9d0cd
commit 2d0e9df579
1 changed files with 15 additions and 5 deletions
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20
fs/xfs/xfs_buf_item.c
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@ -287,6 +287,17 @@ xfs_buf_item_format_segment(
*/
base_size = offsetof(struct xfs_buf_log_format, blf_data_map) +
(blfp->blf_map_size * sizeof(blfp->blf_data_map[0]));
nvecs = 0;
first_bit = xfs_next_bit(blfp->blf_data_map, blfp->blf_map_size, 0);
if (!(bip->bli_flags & XFS_BLI_STALE) && first_bit == -1) {
/*
* If the map is not be dirty in the transaction, mark
* the size as zero and do not advance the vector pointer.
*/
goto out;
}
vecp->i_addr = blfp;
vecp->i_len = base_size;
vecp->i_type = XLOG_REG_TYPE_BFORMAT;
@ -301,15 +312,13 @@ xfs_buf_item_format_segment(
*/
trace_xfs_buf_item_format_stale(bip);
ASSERT(blfp->blf_flags & XFS_BLF_CANCEL);
blfp->blf_size = nvecs;
return vecp;
goto out;
}
/*
* Fill in an iovec for each set of contiguous chunks.
*/
first_bit = xfs_next_bit(blfp->blf_data_map, blfp->blf_map_size, 0);
ASSERT(first_bit != -1);
last_bit = first_bit;
nbits = 1;
for (;;) {
@ -371,7 +380,8 @@ xfs_buf_item_format_segment(
nbits++;
}
}
bip->__bli_format.blf_size = nvecs;
out:
blfp->blf_size = nvecs;
return vecp;
}