From 5d765b976c3a41faf9a73718fb8cc5833990a8ef Mon Sep 17 00:00:00 2001 From: Christoph Hellwig Date: Wed, 3 Dec 2008 12:20:26 +0100 Subject: [PATCH] kill xfs_buf_iostart xfs_buf_iostart is a "shared" helper for xfs_buf_read_flags, xfs_bawrite, and xfs_bdwrite - except that there isn't much shared code but rather special cases for each caller. So remove this function and move the functionality to the caller. xfs_bawrite and xfs_bdwrite are now big enough to be moved out of line and the xfs_buf_read_flags is moved into a new helper called _xfs_buf_read. Signed-off-by: Christoph Hellwig Reviewed-by: Dave Chinner Signed-off-by: Niv Sardi --- fs/xfs/linux-2.6/xfs_buf.c | 84 ++++++++++++++++++++++---------------- fs/xfs/linux-2.6/xfs_buf.h | 22 +--------- 2 files changed, 50 insertions(+), 56 deletions(-) diff --git a/fs/xfs/linux-2.6/xfs_buf.c b/fs/xfs/linux-2.6/xfs_buf.c index 36d5fcd3f593..cd89c56715a5 100644 --- a/fs/xfs/linux-2.6/xfs_buf.c +++ b/fs/xfs/linux-2.6/xfs_buf.c @@ -630,6 +630,29 @@ xfs_buf_get_flags( return NULL; } +STATIC int +_xfs_buf_read( + xfs_buf_t *bp, + xfs_buf_flags_t flags) +{ + int status; + + XB_TRACE(bp, "_xfs_buf_read", (unsigned long)flags); + + ASSERT(!(flags & (XBF_DELWRI|XBF_WRITE))); + ASSERT(bp->b_bn != XFS_BUF_DADDR_NULL); + + bp->b_flags &= ~(XBF_WRITE | XBF_ASYNC | XBF_DELWRI | \ + XBF_READ_AHEAD | _XBF_RUN_QUEUES); + bp->b_flags |= flags & (XBF_READ | XBF_ASYNC | \ + XBF_READ_AHEAD | _XBF_RUN_QUEUES); + + status = xfs_buf_iorequest(bp); + if (!status && !(flags & XBF_ASYNC)) + status = xfs_buf_iowait(bp); + return status; +} + xfs_buf_t * xfs_buf_read_flags( xfs_buftarg_t *target, @@ -646,7 +669,7 @@ xfs_buf_read_flags( if (!XFS_BUF_ISDONE(bp)) { XB_TRACE(bp, "read", (unsigned long)flags); XFS_STATS_INC(xb_get_read); - xfs_buf_iostart(bp, flags); + _xfs_buf_read(bp, flags); } else if (flags & XBF_ASYNC) { XB_TRACE(bp, "read_async", (unsigned long)flags); /* @@ -1048,50 +1071,39 @@ xfs_buf_ioerror( XB_TRACE(bp, "ioerror", (unsigned long)error); } -/* - * Initiate I/O on a buffer, based on the flags supplied. - * The b_iodone routine in the buffer supplied will only be called - * when all of the subsidiary I/O requests, if any, have been completed. - */ int -xfs_buf_iostart( - xfs_buf_t *bp, - xfs_buf_flags_t flags) +xfs_bawrite( + void *mp, + struct xfs_buf *bp) { - int status = 0; + XB_TRACE(bp, "bawrite", 0); - XB_TRACE(bp, "iostart", (unsigned long)flags); + ASSERT(bp->b_bn != XFS_BUF_DADDR_NULL); - if (flags & XBF_DELWRI) { - bp->b_flags &= ~(XBF_READ | XBF_WRITE | XBF_ASYNC); - bp->b_flags |= flags & (XBF_DELWRI | XBF_ASYNC); - xfs_buf_delwri_queue(bp, 1); - return 0; - } + xfs_buf_delwri_dequeue(bp); - bp->b_flags &= ~(XBF_READ | XBF_WRITE | XBF_ASYNC | XBF_DELWRI | \ - XBF_READ_AHEAD | _XBF_RUN_QUEUES); - bp->b_flags |= flags & (XBF_READ | XBF_WRITE | XBF_ASYNC | \ - XBF_READ_AHEAD | _XBF_RUN_QUEUES); + bp->b_flags &= ~(XBF_READ | XBF_DELWRI | XBF_READ_AHEAD); + bp->b_flags |= (XBF_WRITE | XBF_ASYNC | _XBF_RUN_QUEUES); + + bp->b_fspriv3 = mp; + bp->b_strat = xfs_bdstrat_cb; + return xfs_bdstrat_cb(bp); +} - BUG_ON(bp->b_bn == XFS_BUF_DADDR_NULL); +void +xfs_bdwrite( + void *mp, + struct xfs_buf *bp) +{ + XB_TRACE(bp, "bdwrite", 0); - /* For writes allow an alternate strategy routine to precede - * the actual I/O request (which may not be issued at all in - * a shutdown situation, for example). - */ - status = (flags & XBF_WRITE) ? - xfs_buf_iostrategy(bp) : xfs_buf_iorequest(bp); + bp->b_strat = xfs_bdstrat_cb; + bp->b_fspriv3 = mp; - /* Wait for I/O if we are not an async request. - * Note: async I/O request completion will release the buffer, - * and that can already be done by this point. So using the - * buffer pointer from here on, after async I/O, is invalid. - */ - if (!status && !(flags & XBF_ASYNC)) - status = xfs_buf_iowait(bp); + bp->b_flags &= ~XBF_READ; + bp->b_flags |= (XBF_DELWRI | XBF_ASYNC); - return status; + xfs_buf_delwri_queue(bp, 1); } STATIC_INLINE void diff --git a/fs/xfs/linux-2.6/xfs_buf.h b/fs/xfs/linux-2.6/xfs_buf.h index 456519a088c7..0e2aa16f5e41 100644 --- a/fs/xfs/linux-2.6/xfs_buf.h +++ b/fs/xfs/linux-2.6/xfs_buf.h @@ -214,9 +214,10 @@ extern void xfs_buf_lock(xfs_buf_t *); extern void xfs_buf_unlock(xfs_buf_t *); /* Buffer Read and Write Routines */ +extern int xfs_bawrite(void *mp, xfs_buf_t *bp); +extern void xfs_bdwrite(void *mp, xfs_buf_t *bp); extern void xfs_buf_ioend(xfs_buf_t *, int); extern void xfs_buf_ioerror(xfs_buf_t *, int); -extern int xfs_buf_iostart(xfs_buf_t *, xfs_buf_flags_t); extern int xfs_buf_iorequest(xfs_buf_t *); extern int xfs_buf_iowait(xfs_buf_t *); extern void xfs_buf_iomove(xfs_buf_t *, size_t, size_t, xfs_caddr_t, @@ -366,14 +367,6 @@ extern void xfs_buf_trace(xfs_buf_t *, char *, void *, void *); #define XFS_BUF_TARGET(bp) ((bp)->b_target) #define XFS_BUFTARG_NAME(target) xfs_buf_target_name(target) -static inline int xfs_bawrite(void *mp, xfs_buf_t *bp) -{ - bp->b_fspriv3 = mp; - bp->b_strat = xfs_bdstrat_cb; - xfs_buf_delwri_dequeue(bp); - return xfs_buf_iostart(bp, XBF_WRITE | XBF_ASYNC | _XBF_RUN_QUEUES); -} - static inline void xfs_buf_relse(xfs_buf_t *bp) { if (!bp->b_relse) @@ -414,17 +407,6 @@ static inline int XFS_bwrite(xfs_buf_t *bp) return error; } -/* - * No error can be returned from xfs_buf_iostart for delwri - * buffers as they are queued and no I/O is issued. - */ -static inline void xfs_bdwrite(void *mp, xfs_buf_t *bp) -{ - bp->b_strat = xfs_bdstrat_cb; - bp->b_fspriv3 = mp; - (void)xfs_buf_iostart(bp, XBF_DELWRI | XBF_ASYNC); -} - #define XFS_bdstrat(bp) xfs_buf_iorequest(bp) #define xfs_iowait(bp) xfs_buf_iowait(bp) -- 2.39.5