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authorJan Kara <jack@suse.cz>2014-11-07 08:29:25 +1100
committerDave Chinner <david@fromorbit.com>2014-11-07 08:29:25 +1100
commit77783d06427293b2d711c45cfd4abc6494a1af9c (patch)
tree5d8eed71173edc1dc005af5e2dc3136ce5512e72 /mm/truncate.c
parent5d11fb4b9a1d90983452c029b5e1377af78fda49 (diff)
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>
Diffstat (limited to 'mm/truncate.c')
-rw-r--r--mm/truncate.c5
1 files changed, 3 insertions, 2 deletions
diff --git a/mm/truncate.c b/mm/truncate.c
index c646084e5eec..f1e4d6052369 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)
{

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