xfs: remove xfs_inobp_check()

This debug code is called on every xfs_iflush() call, which then
checks every inode in the buffer for non-zero unlinked list field.
Hence it checks every inode in the cluster buffer every time a
single inode on that cluster it flushed. This is resulting in:

-   38.91%     5.33%  [kernel]  [k] xfs_iflush
   - 17.70% xfs_iflush
      - 9.93% xfs_inobp_check
           4.36% xfs_buf_offset

10% of the CPU time spent flushing inodes is repeatedly checking
unlinked fields in the buffer. We don't need to do this.

The other place we call xfs_inobp_check() is
xfs_iunlink_update_dinode(), and this is after we've done this
assert for the agino we are about to write into that inode:

	ASSERT(xfs_verify_agino_or_null(mp, agno, next_agino));

which means we've already checked that the agino we are about to
write is not 0 on debug kernels. The inode buffer verifiers do
everything else we need, so let's just remove this debug code.

Signed-off-by: Dave Chinner <dchinner@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Darrick J. Wong <darrick.wong@oracle.com>
Signed-off-by: Darrick J. Wong <darrick.wong@oracle.com>

diff --git a/fs/xfs/libxfs/xfs_inode_buf.c b/fs/xfs/libxfs/xfs_inode_buf.c
index b4a6c09..8d5dd08 100644 (file)
--- a/fs/xfs/libxfs/xfs_inode_buf.c
+++ b/fs/xfs/libxfs/xfs_inode_buf.c
@@ -21,30 +21,6 @@
 #include <linux/iversion.h>
 
 /*
- * Check that none of the inode's in the buffer have a next
- * unlinked field of 0.
- */
-#if defined(DEBUG)
-void
-xfs_inobp_check(
-       xfs_mount_t     *mp,
-       xfs_buf_t       *bp)
-{
-       int             i;
-       xfs_dinode_t    *dip;
-
-       for (i = 0; i < M_IGEO(mp)->inodes_per_cluster; i++) {
-               dip = xfs_buf_offset(bp, i * mp->m_sb.sb_inodesize);
-               if (!dip->di_next_unlinked)  {
-                       xfs_alert(mp,
-       "Detected bogus zero next_unlinked field in inode %d buffer 0x%llx.",
-                               i, (long long)bp->b_bn);
-               }
-       }
-}
-#endif
-
-/*
  * If we are doing readahead on an inode buffer, we might be in log recovery
  * reading an inode allocation buffer that hasn't yet been replayed, and hence
  * has not had the inode cores stamped into it. Hence for readahead, the buffer

diff --git a/fs/xfs/libxfs/xfs_inode_buf.h b/fs/xfs/libxfs/xfs_inode_buf.h
index 865ac49..6b08b9d 100644 (file)
--- a/fs/xfs/libxfs/xfs_inode_buf.h
+++ b/fs/xfs/libxfs/xfs_inode_buf.h
@@ -52,12 +52,6 @@ int  xfs_inode_from_disk(struct xfs_inode *ip, struct xfs_dinode *from);
 void   xfs_log_dinode_to_disk(struct xfs_log_dinode *from,
                               struct xfs_dinode *to);
 
-#if defined(DEBUG)
-void   xfs_inobp_check(struct xfs_mount *, struct xfs_buf *);
-#else
-#define        xfs_inobp_check(mp, bp)
-#endif /* DEBUG */
-
 xfs_failaddr_t xfs_dinode_verify(struct xfs_mount *mp, xfs_ino_t ino,
                           struct xfs_dinode *dip);
 xfs_failaddr_t xfs_inode_validate_extsize(struct xfs_mount *mp,

diff --git a/fs/xfs/xfs_inode.c b/fs/xfs/xfs_inode.c
index ece3622..5c07bf4 100644 (file)
--- a/fs/xfs/xfs_inode.c
+++ b/fs/xfs/xfs_inode.c
@@ -2165,7 +2165,6 @@ xfs_iunlink_update_dinode(
        xfs_dinode_calc_crc(mp, dip);
        xfs_trans_inode_buf(tp, ibp);
        xfs_trans_log_buf(tp, ibp, offset, offset + sizeof(xfs_agino_t) - 1);
-       xfs_inobp_check(mp, ibp);
 }
 
 /* Set an in-core inode's unlinked pointer and return the old value. */
@@ -3558,7 +3557,6 @@ xfs_iflush(
        xfs_iflush_fork(ip, dip, iip, XFS_DATA_FORK);
        if (XFS_IFORK_Q(ip))
                xfs_iflush_fork(ip, dip, iip, XFS_ATTR_FORK);
-       xfs_inobp_check(mp, bp);
 
        /*
         * We've recorded everything logged in the inode, so we'd like to clear