int
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);
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
* the smallest block size we support, and bsize (block size)
* as the filesystem's maximum block size. Unfortunately,
* under Linux the fragment size and block size are often used
* interchangeably. Thus we are forced to report both of them
* as the filesystem's maximum block size.
*/
statp->f_frsize = zsb->z_max_blksz;
statp->f_bsize = zsb->z_max_blksz;
bshift = fls(statp->f_bsize) - 1;
/*
* The following report "total" blocks of various kinds in
* the file system, but reported in terms of f_bsize - the
* "preferred" size.
*/
statp->f_blocks = (refdbytes + availbytes) >> bshift;
statp->f_bfree = availbytes >> bshift;
statp->f_bavail = statp->f_bfree; /* no root reservation */
/*
* statvfs() should really be called statufs(), because it assumes
* static metadata. ZFS doesn't preallocate files, so the best
* we can do is report the max that could possibly fit in f_files,
* and that minus the number actually used in f_ffree.
* For f_ffree, report the smaller of the number of object available
* and the number of blocks (each object will take at least a block).
*/
statp->f_ffree = MIN(availobjs, availbytes >> DNODE_SHIFT);
statp->f_files = statp->f_ffree + usedobjs;
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;
/*
* We have all of 40 characters to stuff a string here.
* Is there anything useful we could/should provide?
*/
bzero(statp->f_spare, sizeof (statp->f_spare));
ZFS_EXIT(zsb);
return (0);
}
/*
* zfs_init_fs - Initialize the zfsvfs struct and the file system
* incore "master" object. Verify version compatibility.
*/
int
zfs_init_fs(zfsvfs_t *zfsvfs, znode_t **zpp)
{
objset_t *os = zfsvfs->z_os;
int i, error;
uint64_t fsid_guid;
uint64_t zval;
*zpp = NULL;
error = zfs_get_zplprop(os, ZFS_PROP_VERSION, &zfsvfs->z_version);
if (error) {
return (error);
} else if (zfsvfs->z_version > ZPL_VERSION) {
(void) printf("Mismatched versions: File system "
"is version %llu on-disk format, which is "
"incompatible with this software version %lld!",
(u_longlong_t)zfsvfs->z_version, ZPL_VERSION);
return (ENOTSUP);
}
if ((error = zfs_get_zplprop(os, ZFS_PROP_NORMALIZE, &zval)) != 0)
return (error);
zfsvfs->z_norm = (int)zval;
if ((error = zfs_get_zplprop(os, ZFS_PROP_UTF8ONLY, &zval)) != 0)
return (error);
zfsvfs->z_utf8 = (zval != 0);
if ((error = zfs_get_zplprop(os, ZFS_PROP_CASE, &zval)) != 0)
return (error);
zfsvfs->z_case = (uint_t)zval;
/*
* Fold case on file systems that are always or sometimes case
* insensitive.
*/
if (zfsvfs->z_case == ZFS_CASE_INSENSITIVE ||
zfsvfs->z_case == ZFS_CASE_MIXED)
zfsvfs->z_norm |= U8_TEXTPREP_TOUPPER;
/*
* The fsid is 64 bits, composed of an 8-bit fs type, which
* separates our fsid from any other filesystem types, and a
* 56-bit objset unique ID. The objset unique ID is unique to
* all objsets open on this system, provided by unique_create().
* The 8-bit fs type must be put in the low bits of fsid[1]
* because that's where other Solaris filesystems put it.
*/
fsid_guid = dmu_objset_fsid_guid(os);
ASSERT((fsid_guid & ~((1ULL<<56)-1)) == 0);
zfsvfs->z_vfs->vfs_fsid.val[0] = fsid_guid;
zfsvfs->z_vfs->vfs_fsid.val[1] = ((fsid_guid>>32) << 8) |
zfsvfs->z_vfs->mnt_vfc->vfc_typenum & 0xFF;
error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_ROOT_OBJ, 8, 1,
&zfsvfs->z_root);
if (error)
return (error);
ASSERT(zfsvfs->z_root != 0);
error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_UNLINKED_SET, 8, 1,
&zfsvfs->z_unlinkedobj);
if (error)
return (error);
/*
* Initialize zget mutex's
*/
for (i = 0; i != ZFS_OBJ_MTX_SZ; i++)
mutex_init(&zfsvfs->z_hold_mtx[i], NULL, MUTEX_DEFAULT, NULL);
error = zfs_zget(zfsvfs, zfsvfs->z_root, zpp);
if (error) {
/*
* On error, we destroy the mutexes here since it's not
* possible for the caller to determine if the mutexes were
* initialized properly.
*/
for (i = 0; i != ZFS_OBJ_MTX_SZ; i++)
mutex_destroy(&zfsvfs->z_hold_mtx[i]);
return (error);
}
ASSERT3U((*zpp)->z_id, ==, zfsvfs->z_root);
error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_FUID_TABLES, 8, 1,
&zfsvfs->z_fuid_obj);
if (error == ENOENT)
error = 0;
return (0);
}