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Make ZFS filesystem id persistent across different machines

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Use ZFS dataset fsid guid as a unique file system id, similar to what is
done on Illumos/OpenSolaris.

Signed-off-by: Cyril Plisko <cyril.plisko@mountall.com>
Signed-off-by: Brian Behlendorf <behlendorf1@llnl.gov>
Closes #888
This commit is contained in:
Cyril Plisko 2012-08-24 15:38:55 +03:00 committed by Brian Behlendorf
parent 4b2f65b253
commit 04f9432d3b
1 changed files with 4 additions and 2 deletions
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6
module/zfs/zfs_vfsops.c
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@ -920,6 +920,7 @@ zfs_statvfs(struct dentry *dentry, struct kstatfs *statp)
{
zfs_sb_t *zsb = dentry->d_sb->s_fs_info;
uint64_t refdbytes, availbytes, usedobjs, availobjs;
uint64_t fsid;
uint32_t bshift;
ZFS_ENTER(zsb);
@ -927,6 +928,7 @@ zfs_statvfs(struct dentry *dentry, struct kstatfs *statp)
dmu_objset_space(zsb->z_os,
&refdbytes, &availbytes, &usedobjs, &availobjs);
fsid = dmu_objset_fsid_guid(zsb->z_os);
/*
* The underlying storage pool actually uses multiple block
* size. Under Solaris frsize (fragment size) is reported as
@ -960,8 +962,8 @@ zfs_statvfs(struct dentry *dentry, struct kstatfs *statp)
*/
statp->f_ffree = MIN(availobjs, availbytes >> DNODE_SHIFT);
statp->f_files = statp->f_ffree + usedobjs;
statp->f_fsid.val[0] = dentry->d_sb->s_dev;
statp->f_fsid.val[1] = 0;
statp->f_fsid.val[0] = (uint32_t)fsid;
statp->f_fsid.val[1] = (uint32_t)(fsid >> 32);
statp->f_type = ZFS_SUPER_MAGIC;
statp->f_namelen = ZFS_MAXNAMELEN;