[PATCH 1/5] xfs: take the ilock around xfs_bmapi_read in xfs_zero_remaining_bytes

[Christoph Hellwig <hch@xxxxxxxxxxxxx>]

Signed-off-by: Christoph Hellwig <hch@xxxxxx>

Index: xfs/fs/xfs/xfs_bmap_util.c
===================================================================
--- xfs.orig/fs/xfs/xfs_bmap_util.c     2013-12-05 11:37:57.791685284 +0100
+++ xfs/fs/xfs/xfs_bmap_util.c  2013-12-05 11:39:43.599683113 +0100
@@ -1147,6 +1147,7 @@ xfs_zero_remaining_bytes(
        xfs_mount_t             *mp = ip->i_mount;
        int                     nimap;
        int                     error = 0;
+       uint                    lock_mode;
 
        /*
         * Avoid doing I/O beyond eof - it's not necessary
@@ -1159,11 +1160,15 @@ xfs_zero_remaining_bytes(
        if (endoff > XFS_ISIZE(ip))
                endoff = XFS_ISIZE(ip);
 
+       lock_mode = xfs_ilock_map_shared(ip);
+
        bp = xfs_buf_get_uncached(XFS_IS_REALTIME_INODE(ip) ?
                                        mp->m_rtdev_targp : mp->m_ddev_targp,
                                  BTOBB(mp->m_sb.sb_blocksize), 0);
-       if (!bp)
-               return XFS_ERROR(ENOMEM);
+       if (!bp) {
+               error = XFS_ERROR(ENOMEM);
+               goto out_unlock;
+       }
 
        xfs_buf_unlock(bp);
 
@@ -1209,6 +1214,8 @@ xfs_zero_remaining_bytes(
                }
        }
        xfs_buf_free(bp);
+out_unlock:
+       xfs_iunlock_map_shared(ip, lock_mode);
        return error;
 }