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authorAmir Goldstein <amir73il@gmail.com>2021-03-22 20:39:43 +0300
committerJan Kara <jack@suse.cz>2021-04-19 17:03:15 +0300
commit9591c3a34f7722bd77f42c98d76fd5a5bad465f0 (patch)
tree44001867b11da3de1fa029e50ab636ea381c0c7a /include/linux/statfs.h
parent22d483b99863202e3631ff66fa0f3c2302c0f96f (diff)
downloadlinux-9591c3a34f7722bd77f42c98d76fd5a5bad465f0.tar.xz
fs: introduce a wrapper uuid_to_fsid()
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>
Diffstat (limited to 'include/linux/statfs.h')
-rw-r--r--include/linux/statfs.h8
1 files changed, 8 insertions, 0 deletions
diff --git a/include/linux/statfs.h b/include/linux/statfs.h
index 20f695b90aab..02c862686ea3 100644
--- a/include/linux/statfs.h
+++ b/include/linux/statfs.h
@@ -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