xfs: fix the multi-segment log buffer format

Per Dave Chinner suggestion, this patch:
 1) Corrects the detection of whether a multi-segment buffer is
    still tracking data.
 2) Clears all the buffer log formats for a multi-segment buffer.

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

2 files changed, 15 insertions, 5 deletions

diff --git a/fs/xfs/xfs_buf_item.c b/fs/xfs/xfs_buf_item.c
index c48e60bd857d..77b09750e92c 100644
--- a/fs/xfs/xfs_buf_item.c
+++ b/fs/xfs/xfs_buf_item.c
@@ -611,7 +611,7 @@ xfs_buf_item_unlock(
 {
         struct xfs_buf_log_item *bip = BUF_ITEM(lip);
         struct xfs_buf          *bp = bip->bli_buf;
-        int                     aborted;
+        int                     aborted, clean, i;
         uint                    hold;
 
         /* Clear the buffer's association with this transaction. */
@@ -654,8 +654,15 @@ xfs_buf_item_unlock(
          * If the buf item isn't tracking any data, free it, otherwise drop the
          * reference we hold to it.
          */
-        if (xfs_bitmap_empty(bip->__bli_format.blf_data_map,
-                             bip->__bli_format.blf_map_size))
+        clean = 1;
+        for (i = 0; i < bip->bli_format_count; i++) {
+                if (!xfs_bitmap_empty(bip->bli_formats[i].blf_data_map,
+                             bip->bli_formats[i].blf_map_size)) {
+                        clean = 0;
+                        break;
+                }
+        }
+        if (clean)
                 xfs_buf_item_relse(bp);
         else
                 atomic_dec(&bip->bli_refcount);
diff --git a/fs/xfs/xfs_trans_buf.c b/fs/xfs/xfs_trans_buf.c
index f7510bf68284..3edf5dbee001 100644
--- a/fs/xfs/xfs_trans_buf.c
+++ b/fs/xfs/xfs_trans_buf.c
@@ -643,6 +643,7 @@ xfs_trans_binval(
         xfs_buf_t       *bp)
 {
         xfs_buf_log_item_t      *bip = bp->b_fspriv;
+        int                     i;
 
         ASSERT(bp->b_transp == tp);
         ASSERT(bip != NULL);
@@ -670,8 +671,10 @@ xfs_trans_binval(
         bip->bli_flags &= ~(XFS_BLI_INODE_BUF | XFS_BLI_LOGGED | XFS_BLI_DIRTY);
         bip->__bli_format.blf_flags &= ~XFS_BLF_INODE_BUF;
         bip->__bli_format.blf_flags |= XFS_BLF_CANCEL;
-        memset((char *)(bip->__bli_format.blf_data_map), 0,
-              (bip->__bli_format.blf_map_size * sizeof(uint)));
+        for (i = 0; i < bip->bli_format_count; i++) {
+                memset(bip->bli_formats[i].blf_data_map, 0,
+                       (bip->bli_formats[i].blf_map_size * sizeof(uint)));
+        }
         bip->bli_item.li_desc->lid_flags |= XFS_LID_DIRTY;
         tp->t_flags |= XFS_TRANS_DIRTY;
 }