mm: Fix comment before truncate_setsize()

XFS doesn't always hold i_mutex when calling truncate_setsize() and it uses a different lock to serialize truncates and writes. So fix the comment before truncate_setsize(). Reported-by: Jan Beulich <[email protected]> Signed-off-by: Jan Kara <[email protected]> Signed-off-by: Dave Chinner <[email protected]>
josf · Nov 6, 2014 · 77783d0 · 77783d0
1 parent 5d11fb4
commit 77783d0
Showing 1 changed file with 3 additions and 2 deletions.
diff --git a/mm/truncate.c b/mm/truncate.c
@@ -715,8 +715,9 @@ EXPORT_SYMBOL(truncate_pagecache);
  * necessary) to @newsize. It will be typically be called from the filesystem's
  * setattr function when ATTR_SIZE is passed in.
  *
- * Must be called with inode_mutex held and before all filesystem specific
- * block truncation has been performed.
+ * Must be called with a lock serializing truncates and writes (generally
+ * i_mutex but e.g. xfs uses a different lock) and before all filesystem
+ * specific block truncation has been performed.
  */
 void truncate_setsize(struct inode *inode, loff_t newsize)
 {