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 <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: Ben Myers <bpm@sgi.com>

2 files changed, 79 insertions, 39 deletions

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) ?