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[XFS] endianess annotations and tidying for the uuid code 

SGI-PV: 943272
SGI-Modid: xfs-linux-melb:xfs-kern:203709a

Signed-off-by: Christoph Hellwig <hch@sgi.com>
Signed-off-by: Nathan Scott <nathans@sgi.com>
This commit is contained in:
Christoph Hellwig 2006-01-11 15:37:17 +11:00 committed by Nathan Scott
parent 60a204f096
commit 794fe2dc65
1 changed files with 14 additions and 9 deletions
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23
fs/xfs/support/uuid.c
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@ -27,6 +27,16 @@ uuid_init(void)
mutex_init(&uuid_monitor); mutex_init(&uuid_monitor);
} }
/* IRIX interpretation of an uuid_t */
typedef struct {
__be32 uu_timelow;
__be16 uu_timemid;
__be16 uu_timehi;
__be16 uu_clockseq;
__be16 uu_node[3];
} xfs_uu_t;
/* /*
* uuid_getnodeuniq - obtain the node unique fields of a UUID. * uuid_getnodeuniq - obtain the node unique fields of a UUID.
* *
@ -36,16 +46,11 @@ uuid_init(void)
void void
uuid_getnodeuniq(uuid_t *uuid, int fsid [2]) uuid_getnodeuniq(uuid_t *uuid, int fsid [2])
{ {
char *uu = (char *)uuid; xfs_uu_t *uup = (xfs_uu_t *)uuid;
/* on IRIX, this function assumes big-endian fields within fsid[0] = (be16_to_cpu(uup->uu_clockseq) << 16) |
* the uuid, so we use INT_GET to get the same result on be16_to_cpu(uup->uu_timemid);
* little-endian systems fsid[1] = be16_to_cpu(uup->uu_timelow);
*/
fsid[0] = (INT_GET(*(u_int16_t*)(uu+8), ARCH_CONVERT) << 16) +
INT_GET(*(u_int16_t*)(uu+4), ARCH_CONVERT);
fsid[1] = INT_GET(*(u_int32_t*)(uu ), ARCH_CONVERT);
} }
void void