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>

diff --git a/fs/xfs/xfs_buf_item.c b/fs/xfs/xfs_buf_item.c
index c48e60b..77b0975 100644 (file)
--- 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 f7510bf..3edf5db 100644 (file)
--- 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;
 }