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vfs: O_* bit numbers uniqueness check

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The O_* bit numbers are defined in 20+ arch/*, and can silently overlap.
Add a compile time check to ensure the uniqueness as suggested by David
Miller.

Signed-off-by: Wu Fengguang <[email protected]>
Cc: David Miller <[email protected]>
Cc: Stephen Rothwell <[email protected]>
Cc: Al Viro <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Cc: Eric Paris <[email protected]>
Cc: Roland Dreier <[email protected]>
Cc: Jamie Lokier <[email protected]>
Cc: Andreas Schwab <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Wu Fengguang 2010-08-10 18:01:29 -07:00 • committed by Linus Torvalds
commit 454eedb890
2 changed files with 17 additions and 2 deletions
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15
fs/fcntl.c
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@ -767,11 +767,22 @@ void kill_fasync(struct fasync_struct **fp, int sig, int band)
}
EXPORT_SYMBOL(kill_fasync);
static int __init fasync_init(void)
static int __init fcntl_init(void)
{
/* please add new bits here to ensure allocation uniqueness */
BUILD_BUG_ON(19 - 1 /* for O_RDONLY being 0 */ != HWEIGHT32(
O_RDONLY | O_WRONLY | O_RDWR |
O_CREAT | O_EXCL | O_NOCTTY |
O_TRUNC | O_APPEND | O_NONBLOCK |
__O_SYNC | O_DSYNC | FASYNC |
O_DIRECT | O_LARGEFILE | O_DIRECTORY |
O_NOFOLLOW | O_NOATIME | O_CLOEXEC |
FMODE_EXEC
));
fasync_cache = kmem_cache_create("fasync_cache",
sizeof(struct fasync_struct), 0, SLAB_PANIC, NULL);
return 0;
}
module_init(fasync_init)
module_init(fcntl_init)