summaryrefslogtreecommitdiff
path: root/fs/xfs/linux-2.6/xfs_buf.h
diff options
context:
space:
mode:
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/linux-2.6/xfs_buf.h
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/linux-2.6/xfs_buf.h')
-rw-r--r--fs/xfs/linux-2.6/xfs_buf.h8
1 files changed, 0 insertions, 8 deletions
diff --git a/fs/xfs/linux-2.6/xfs_buf.h b/fs/xfs/linux-2.6/xfs_buf.h
index 814f9e83b516..d072e5ff923b 100644
--- a/fs/xfs/linux-2.6/xfs_buf.h
+++ b/fs/xfs/linux-2.6/xfs_buf.h
@@ -187,7 +187,6 @@ typedef struct xfs_buf {
atomic_t b_io_remaining; /* #outstanding I/O requests */
xfs_buf_iodone_t b_iodone; /* I/O completion function */
xfs_buf_relse_t b_relse; /* releasing function */
- xfs_buf_bdstrat_t b_strat; /* pre-write function */
struct completion b_iowait; /* queue for I/O waiters */
void *b_fspriv;
void *b_fspriv2;
@@ -245,11 +244,6 @@ extern int xfs_buf_iowait(xfs_buf_t *);
extern void xfs_buf_iomove(xfs_buf_t *, size_t, size_t, void *,
xfs_buf_rw_t);
-static inline int xfs_buf_iostrategy(xfs_buf_t *bp)
-{
- return bp->b_strat ? bp->b_strat(bp) : xfs_buf_iorequest(bp);
-}
-
static inline int xfs_buf_geterror(xfs_buf_t *bp)
{
return bp ? bp->b_error : ENOMEM;
@@ -321,8 +315,6 @@ extern void xfs_buf_terminate(void);
#define XFS_BUF_IODONE_FUNC(bp) ((bp)->b_iodone)
#define XFS_BUF_SET_IODONE_FUNC(bp, func) ((bp)->b_iodone = (func))
#define XFS_BUF_CLR_IODONE_FUNC(bp) ((bp)->b_iodone = NULL)
-#define XFS_BUF_SET_BDSTRAT_FUNC(bp, func) ((bp)->b_strat = (func))
-#define XFS_BUF_CLR_BDSTRAT_FUNC(bp) ((bp)->b_strat = NULL)
#define XFS_BUF_FSPRIVATE(bp, type) ((type)(bp)->b_fspriv)
#define XFS_BUF_SET_FSPRIVATE(bp, val) ((bp)->b_fspriv = (void*)(val))