Commit ffc13a38 authored by Trond Myklebust's avatar Trond Myklebust Committed by Linus Torvalds

[PATCH] Fix posix file locking (8/9)

VFS: Fix up documentation for the new locking interfaces.
Signed-off-by: default avatarTrond Myklebust <trond.myklebust@fys.uio.no>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 6640d8f3
......@@ -276,21 +276,34 @@ foo_get_block(). It's an overkill, since block bitmaps can be protected by
internal fs locking and real critical areas are much smaller than the areas
filesystems protect now.
--------------------------- file_lock ------------------------------------
----------------------- file_lock_operations ------------------------------
prototypes:
void (*fl_notify)(struct file_lock *); /* unblock callback */
void (*fl_insert)(struct file_lock *); /* lock insertion callback */
void (*fl_remove)(struct file_lock *); /* lock removal callback */
void (*fl_copy_lock)(struct file_lock *, struct file_lock *);
void (*fl_release_private)(struct file_lock *);
locking rules:
BKL may block
fl_notify: yes no
fl_insert: yes no
fl_remove: yes no
fl_copy_lock: yes no
fl_release_private: yes yes
----------------------- lock_manager_operations ---------------------------
prototypes:
int (*fl_compare_owner)(struct file_lock *, struct file_lock *);
void (*fl_notify)(struct file_lock *); /* unblock callback */
locking rules:
BKL may block
fl_compare_owner: yes no
fl_notify: yes no
Currently only NLM provides instances of this class. None of the
them block. If you have out-of-tree instances - please, show up. Locking
in that area will change.
--------------------------- buffer_head -----------------------------------
prototypes:
void (*b_end_io)(struct buffer_head *bh, int uptodate);
......
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