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fs: introduce a wrapper uuid_to_fsid()

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Some filesystem's use a digest of their uuid for f_fsid.
Create a simple wrapper for this open coded folding.

Filesystems that have a non null uuid but use the block device
number for f_fsid may also consider using this helper.

[JK: Added missing asm/byteorder.h include]
Link: https://lore.kernel.org/r/20210322173944.449469-2-amir73il@gmail.com
Acked-by: Damien Le Moal <damien.lemoal@wdc.com>
Reviewed-by: Christian Brauner <christian.brauner@ubuntu.com>
Signed-off-by: Amir Goldstein <amir73il@gmail.com>
Signed-off-by: Jan Kara <jack@suse.cz>
This commit is contained in:
Amir Goldstein
2021-03-22 19:39:43 +02:00
committed by Jan Kara
parent 22d483b998
commit 9591c3a34f
4 changed files with 11 additions and 12 deletions
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8
include/linux/statfs.h
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@@ -4,6 +4,7 @@
#include <linux/types.h>
#include <asm/statfs.h>
#include <asm/byteorder.h>
struct kstatfs {
long f_type;
@@ -50,4 +51,11 @@ static inline __kernel_fsid_t u64_to_fsid(u64 v)
return (__kernel_fsid_t){.val = {(u32)v, (u32)(v>>32)}};
}
/* Fold 16 bytes uuid to 64 bit fsid */
static inline __kernel_fsid_t uuid_to_fsid(__u8 *uuid)
{
return u64_to_fsid(le64_to_cpup((void *)uuid) ^
le64_to_cpup((void *)(uuid + sizeof(u64))));
}
#endif