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-rw-r--r--Documentation/filesystems/porting20
1 files changed, 20 insertions, 0 deletions
diff --git a/Documentation/filesystems/porting b/Documentation/filesystems/porting
index 17bb4dc28fae..7b7b845c490a 100644
--- a/Documentation/filesystems/porting
+++ b/Documentation/filesystems/porting
@@ -602,3 +602,23 @@ in your dentry operations instead.
dentry separately, and it now has request_mask and query_flags arguments
to specify the fields and sync type requested by statx. Filesystems not
supporting any statx-specific features may ignore the new arguments.
+--
+[mandatory]
+ ->atomic_open() calling conventions have changed. Gone is int *opened,
+ along with FILE_OPENED/FILE_CREATED. In place of those we have
+ FMODE_OPENED/FMODE_CREATED, set in file->f_mode. Additionally, return
+ value for 'called finish_no_open(), open it yourself' case has become
+ 0, not 1. Since finish_no_open() itself is returning 0 now, that part
+ does not need any changes in ->atomic_open() instances.
+--
+[mandatory]
+ alloc_file() has become static now; two wrappers are to be used instead.
+ alloc_file_pseudo(inode, vfsmount, name, flags, ops) is for the cases
+ when dentry needs to be created; that's the majority of old alloc_file()
+ users. Calling conventions: on success a reference to new struct file
+ is returned and callers reference to inode is subsumed by that. On
+ failure, ERR_PTR() is returned and no caller's references are affected,
+ so the caller needs to drop the inode reference it held.
+ 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().