From de2a4f59190303ff5b82ead2969968a325e61230 Mon Sep 17 00:00:00 2001 From: Dave Chinner Date: Fri, 22 Jun 2012 18:50:11 +1000 Subject: xfs: add discontiguous buffer support to transactions Now that the buffer cache supports discontiguous buffers, add support to the transaction buffer interface for getting and reading buffers. Note that this patch does not convert the buffer item logging to support discontiguous buffers. That will be done as a separate commit. Signed-off-by: Dave Chinner Reviewed-by: Christoph Hellwig Signed-off-by: Ben Myers --- fs/xfs/xfs_trans.h | 50 +++++++++++++++++++++++++++++++++---- fs/xfs/xfs_trans_buf.c | 68 +++++++++++++++++++++++++------------------------- 2 files changed, 79 insertions(+), 39 deletions(-) (limited to 'fs/xfs') diff --git a/fs/xfs/xfs_trans.h b/fs/xfs/xfs_trans.h index 7c37b533aa8e..bc2afd52a0b7 100644 --- a/fs/xfs/xfs_trans.h +++ b/fs/xfs/xfs_trans.h @@ -448,11 +448,51 @@ xfs_trans_t *xfs_trans_dup(xfs_trans_t *); int xfs_trans_reserve(xfs_trans_t *, uint, uint, uint, uint, uint); void xfs_trans_mod_sb(xfs_trans_t *, uint, int64_t); -struct xfs_buf *xfs_trans_get_buf(xfs_trans_t *, struct xfs_buftarg *, xfs_daddr_t, - int, uint); -int xfs_trans_read_buf(struct xfs_mount *, xfs_trans_t *, - struct xfs_buftarg *, xfs_daddr_t, int, uint, - struct xfs_buf **); + +struct xfs_buf *xfs_trans_get_buf_map(struct xfs_trans *tp, + struct xfs_buftarg *target, + struct xfs_buf_map *map, int nmaps, + uint flags); + +static inline struct xfs_buf * +xfs_trans_get_buf( + struct xfs_trans *tp, + struct xfs_buftarg *target, + xfs_daddr_t blkno, + int numblks, + uint flags) +{ + struct xfs_buf_map map = { + .bm_bn = blkno, + .bm_len = numblks, + }; + return xfs_trans_get_buf_map(tp, target, &map, 1, flags); +} + +int xfs_trans_read_buf_map(struct xfs_mount *mp, + struct xfs_trans *tp, + struct xfs_buftarg *target, + struct xfs_buf_map *map, int nmaps, + xfs_buf_flags_t flags, + struct xfs_buf **bpp); + +static inline int +xfs_trans_read_buf( + struct xfs_mount *mp, + struct xfs_trans *tp, + struct xfs_buftarg *target, + xfs_daddr_t blkno, + int numblks, + xfs_buf_flags_t flags, + struct xfs_buf **bpp) +{ + struct xfs_buf_map map = { + .bm_bn = blkno, + .bm_len = numblks, + }; + return xfs_trans_read_buf_map(mp, tp, target, &map, 1, flags, bpp); +} + struct xfs_buf *xfs_trans_getsb(xfs_trans_t *, struct xfs_mount *, int); void xfs_trans_brelse(xfs_trans_t *, struct xfs_buf *); diff --git a/fs/xfs/xfs_trans_buf.c b/fs/xfs/xfs_trans_buf.c index 21c5a5e3700d..6311b99c267f 100644 --- a/fs/xfs/xfs_trans_buf.c +++ b/fs/xfs/xfs_trans_buf.c @@ -41,20 +41,26 @@ STATIC struct xfs_buf * xfs_trans_buf_item_match( struct xfs_trans *tp, struct xfs_buftarg *target, - xfs_daddr_t blkno, - int len) + struct xfs_buf_map *map, + int nmaps) { struct xfs_log_item_desc *lidp; struct xfs_buf_log_item *blip; + int len = 0; + int i; + + for (i = 0; i < nmaps; i++) + len += map[i].bm_len; - len = BBTOB(len); list_for_each_entry(lidp, &tp->t_items, lid_trans) { blip = (struct xfs_buf_log_item *)lidp->lid_item; if (blip->bli_item.li_type == XFS_LI_BUF && blip->bli_buf->b_target == target && - XFS_BUF_ADDR(blip->bli_buf) == blkno && - BBTOB(blip->bli_buf->b_length) == len) + XFS_BUF_ADDR(blip->bli_buf) == map[0].bm_bn && + blip->bli_buf->b_length == len) { + ASSERT(blip->bli_buf->b_map_count == nmaps); return blip->bli_buf; + } } return NULL; @@ -128,21 +134,19 @@ xfs_trans_bjoin( * If the transaction pointer is NULL, make this just a normal * get_buf() call. */ -xfs_buf_t * -xfs_trans_get_buf(xfs_trans_t *tp, - xfs_buftarg_t *target_dev, - xfs_daddr_t blkno, - int len, - uint flags) +struct xfs_buf * +xfs_trans_get_buf_map( + struct xfs_trans *tp, + struct xfs_buftarg *target, + struct xfs_buf_map *map, + int nmaps, + xfs_buf_flags_t flags) { xfs_buf_t *bp; xfs_buf_log_item_t *bip; - /* - * Default to a normal get_buf() call if the tp is NULL. - */ - if (tp == NULL) - return xfs_buf_get(target_dev, blkno, len, flags); + if (!tp) + return xfs_buf_get_map(target, map, nmaps, flags); /* * If we find the buffer in the cache with this transaction @@ -150,7 +154,7 @@ xfs_trans_get_buf(xfs_trans_t *tp, * have it locked. In this case we just increment the lock * recursion count and return the buffer to the caller. */ - bp = xfs_trans_buf_item_match(tp, target_dev, blkno, len); + bp = xfs_trans_buf_item_match(tp, target, map, nmaps); if (bp != NULL) { ASSERT(xfs_buf_islocked(bp)); if (XFS_FORCED_SHUTDOWN(tp->t_mountp)) { @@ -167,7 +171,7 @@ xfs_trans_get_buf(xfs_trans_t *tp, return (bp); } - bp = xfs_buf_get(target_dev, blkno, len, flags); + bp = xfs_buf_get_map(target, map, nmaps, flags); if (bp == NULL) { return NULL; } @@ -246,26 +250,22 @@ int xfs_error_mod = 33; * read_buf() call. */ int -xfs_trans_read_buf( - xfs_mount_t *mp, - xfs_trans_t *tp, - xfs_buftarg_t *target, - xfs_daddr_t blkno, - int len, - uint flags, - xfs_buf_t **bpp) +xfs_trans_read_buf_map( + struct xfs_mount *mp, + struct xfs_trans *tp, + struct xfs_buftarg *target, + struct xfs_buf_map *map, + int nmaps, + xfs_buf_flags_t flags, + struct xfs_buf **bpp) { xfs_buf_t *bp; xfs_buf_log_item_t *bip; int error; *bpp = NULL; - - /* - * Default to a normal get_buf() call if the tp is NULL. - */ - if (tp == NULL) { - bp = xfs_buf_read(target, blkno, len, flags); + if (!tp) { + bp = xfs_buf_read_map(target, map, nmaps, flags); if (!bp) return (flags & XBF_TRYLOCK) ? EAGAIN : XFS_ERROR(ENOMEM); @@ -303,7 +303,7 @@ xfs_trans_read_buf( * If the buffer is not yet read in, then we read it in, increment * the lock recursion count, and return it to the caller. */ - bp = xfs_trans_buf_item_match(tp, target, blkno, len); + bp = xfs_trans_buf_item_match(tp, target, map, nmaps); if (bp != NULL) { ASSERT(xfs_buf_islocked(bp)); ASSERT(bp->b_transp == tp); @@ -349,7 +349,7 @@ xfs_trans_read_buf( return 0; } - bp = xfs_buf_read(target, blkno, len, flags); + bp = xfs_buf_read_map(target, map, nmaps, flags); if (bp == NULL) { *bpp = NULL; return (flags & XBF_TRYLOCK) ? -- cgit v1.2.3