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authorChristoph Hellwig <hch@infradead.org>2010-07-20 17:51:16 +1000
committerAlex Elder <aelder@sgi.com>2010-07-26 13:16:52 -0500
commit939d723b721eef71060201738653a73443ff4510 (patch)
tree3965391cebe9f1e0c1acb0b394c50c1b83312aa3 /fs/xfs/xfs_buf_item.c
parenta64afb057b607c04383ab5fb53c51421ba18c434 (diff)
xfs: kill the b_strat callback in xfs_buf
The b_strat callback is used by xfs_buf_iostrategy to perform additional checks before submitting a buffer. It is used in xfs_bwrite and when writing out delayed buffers. In xfs_bwrite it we can de-virtualize the call easily as b_strat is set a few lines above the call to xfs_buf_iostrategy. For the delayed buffers the rationale is a bit more complicated: - there are three callers of xfs_buf_delwri_queue, which places buffers on the delwri list: (1) xfs_bdwrite - this sets up b_strat, so it's fine (2) xfs_buf_iorequest. None of the callers can have XBF_DELWRI set: - xlog_bdstrat is only used for log buffers, which are never delwri - _xfs_buf_read explicitly clears the delwri flag - xfs_buf_iodone_work retries log buffers only - xfsbdstrat - only used for reads, superblock writes without the delwri flag, log I/O and file zeroing with explicitly allocated buffers. - xfs_buf_iostrategy - only calls xfs_buf_iorequest if b_strat is not set (3) xfs_buf_unlock - only puts the buffer on the delwri list if the DELWRI flag is already set. The DELWRI flag is only ever set in xfs_bwrite, xfs_buf_iodone_callbacks, or xfs_trans_log_buf. For xfs_buf_iodone_callbacks and xfs_trans_log_buf we require an initialized buf item, which means b_strat was set to xfs_bdstrat_cb in xfs_buf_item_init. Conclusion: we can just get rid of the callback and replace it with explicit calls to xfs_bdstrat_cb. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Dave Chinner <dchinner@redhat.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
Diffstat (limited to 'fs/xfs/xfs_buf_item.c')
-rw-r--r--fs/xfs/xfs_buf_item.c1
1 files changed, 0 insertions, 1 deletions
diff --git a/fs/xfs/xfs_buf_item.c b/fs/xfs/xfs_buf_item.c
index 2a9e4ef1211..1b09d7a280d 100644
--- a/fs/xfs/xfs_buf_item.c
+++ b/fs/xfs/xfs_buf_item.c
@@ -694,7 +694,6 @@ xfs_buf_item_init(
*/
if (bp->b_mount != mp)
bp->b_mount = mp;
- XFS_BUF_SET_BDSTRAT_FUNC(bp, xfs_bdstrat_cb);
if (XFS_BUF_FSPRIVATE(bp, void *) != NULL) {
lip = XFS_BUF_FSPRIVATE(bp, xfs_log_item_t *);
if (lip->li_type == XFS_LI_BUF) {