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fuse: support BSD locking semantics

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It is trivial to add support for flock(2) semantics to the existing protocol,
by setting the lock owner field to the file pointer, and passing a new
FUSE_LK_FLOCK flag with the locking request.

Signed-off-by: Miklos Szeredi <mszeredi@suse.cz>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Miklos Szeredi
2007-10-18 03:07:02 -07:00
committed by Linus Torvalds
parent 6ff958edbf
commit a9ff4f8705
2 changed files with 35 additions and 5 deletions
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8
include/linux/fuse.h
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@@ -13,6 +13,7 @@
*
* 7.9:
* - new fuse_getattr_in input argument of GETATTR
* - add lk_flags in fuse_lk_in
*/
#include <asm/types.h>
@@ -113,6 +114,11 @@ struct fuse_file_lock {
*/
#define FUSE_GETATTR_FH (1 << 0)
/**
* Lock flags
*/
#define FUSE_LK_FLOCK (1 << 0)
enum fuse_opcode {
FUSE_LOOKUP = 1,
FUSE_FORGET = 2, /* no reply */
@@ -295,6 +301,8 @@ struct fuse_lk_in {
__u64 fh;
__u64 owner;
struct fuse_file_lock lk;
__u32 lk_flags;
__u32 padding;
};
struct fuse_lk_out {