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[PATCH] ext3: fsid for statvfs

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Update ext3_statfs to return an FSID that is a 64 bit XOR of the 128 bit
filesystem UUID as suggested by Andreas Dilger.  See the following Bugzilla
entry for details:

  http://bugzilla.kernel.org/show_bug.cgi?id=136

Cc: Andreas Dilger <adilger@clusterfs.com>
Cc: Stephen Tweedie <sct@redhat.com>
Signed-off-by: Pekka Enberg <penberg@cs.helsinki.fi>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Pekka Enberg 2006-12-06 20:35:28 -08:00 committed by Linus Torvalds
parent e4fca01ea2
commit 50ee0a32b1
1 changed files with 5 additions and 0 deletions
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5
fs/ext3/super.c
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@ -2387,6 +2387,7 @@ static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
struct ext3_super_block *es = sbi->s_es;
ext3_fsblk_t overhead;
int i;
u64 fsid;
if (test_opt (sb, MINIX_DF))
overhead = 0;
@ -2433,6 +2434,10 @@ static int ext3_statfs (struct dentry * dentry, struct kstatfs * buf)
buf->f_files = le32_to_cpu(es->s_inodes_count);
buf->f_ffree = percpu_counter_sum(&sbi->s_freeinodes_counter);
buf->f_namelen = EXT3_NAME_LEN;
fsid = le64_to_cpup((void *)es->s_uuid) ^
le64_to_cpup((void *)es->s_uuid + sizeof(u64));
buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL;
buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL;
return 0;
}