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@xxxxxxxx>
Signed-off-by: Jan Kara <jack@xxxxxxx>
---
mm/truncate.c | 5 +++--
1 file changed, 3 insertions(+), 2 deletions(-)
diff --git a/mm/truncate.c b/mm/truncate.c
index b248c0c8dcd1..ed33e8f811e9 100644
--- 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)
{
--
1.8.1.4
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