Merge git://git.kernel.org/pub/scm/linux/kernel/git/kyle/parisc-2.6

[linux-2.6-omap-h63xx.git] / fs / xfs / xfs_vnodeops.c

diff --git a/fs/xfs/xfs_vnodeops.c b/fs/xfs/xfs_vnodeops.c
index 98a0aecafddc8849d94d7d5abce88652531dfe1c..8b6812f66a15bf2895aba5fed5f04be0c22625d8 100644 (file)
--- a/fs/xfs/xfs_vnodeops.c
+++ b/fs/xfs/xfs_vnodeops.c
@@ -3160,6 +3160,13 @@ error1:  /* Just cancel transaction */
 /*
  * Zero file bytes between startoff and endoff inclusive.
  * The iolock is held exclusive and no blocks are buffered.
+ *
+ * This function is used by xfs_free_file_space() to zero
+ * partial blocks when the range to free is not block aligned.
+ * When unreserving space with boundaries that are not block
+ * aligned we round up the start and round down the end
+ * boundaries and then use this function to zero the parts of
+ * the blocks that got dropped during the rounding.
  */
 STATIC int
 xfs_zero_remaining_bytes(
@@ -3176,6 +3183,17 @@ xfs_zero_remaining_bytes(
        int                     nimap;
        int                     error = 0;
 
+       /*
+        * Avoid doing I/O beyond eof - it's not necessary
+        * since nothing can read beyond eof.  The space will
+        * be zeroed when the file is extended anyway.
+        */
+       if (startoff >= ip->i_size)
+               return 0;
+
+       if (endoff > ip->i_size)
+               endoff = ip->i_size;
+
        bp = xfs_buf_get_noaddr(mp->m_sb.sb_blocksize,
                                XFS_IS_REALTIME_INODE(ip) ?
                                mp->m_rtdev_targp : mp->m_ddev_targp);