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-rw-r--r--Documentation/filesystems/porting5
1 files changed, 5 insertions, 0 deletions
diff --git a/Documentation/filesystems/porting b/Documentation/filesystems/porting
index 7b7b845c490a..32b5186be412 100644
--- a/Documentation/filesystems/porting
+++ b/Documentation/filesystems/porting
@@ -622,3 +622,8 @@ in your dentry operations instead.
alloc_file_clone(file, flags, ops) does not affect any caller's references.
On success you get a new struct file sharing the mount/dentry with the
original, on failure - ERR_PTR().
+--
+[mandatory]
+ DCACHE_RCUACCESS is gone; having an RCU delay on dentry freeing is the
+ default. DCACHE_NORCU opts out, and only d_alloc_pseudo() has any
+ business doing so.