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 <JBeulich@suse.com> Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Dave Chinner <david@fromorbit.com>

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 <JBeulich@suse.com> Signed-off-by: Jan Kara <jack@suse.cz> Signed-off-by: Dave Chinner <david@fromorbit.com>
Jan Kara · Dave Chinner
1 parent 5d11fb4b9a
Showing 1 changed file with 3 additions and 2 deletions Side-by-side Diff
mm/truncate.c
@@ -715,8 +715,9 @@
  * 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)
 {
...	...	@@ -715,8 +715,9 @@
715	715	* necessary) to @newsize. It will be typically be called from the filesystem's
716	716	* setattr function when ATTR_SIZE is passed in.
717	717	*
718		- * Must be called with inode_mutex held and before all filesystem specific
719		- * block truncation has been performed.
	718	+ * Must be called with a lock serializing truncates and writes (generally
	719	+ * i_mutex but e.g. xfs uses a different lock) and before all filesystem
	720	+ * specific block truncation has been performed.
720	721	*/
721	722	void truncate_setsize(struct inode *inode, loff_t newsize)
722	723	{