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Create a root znode without VFS dependencies 

For portability reasons it's handy to be able to create a root
znode and basic filesystem components without requiring the full
cooperation of the VFS.  We are committing to this to simply the
filesystem creations code.
This commit is contained in:
Brian Behlendorf 2011-01-26 12:49:58 -08:00
parent bcf308227c
commit eb28321e2d
1 changed files with 4 additions and 85 deletions
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89
module/zfs/zfs_znode.c
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@ -1484,23 +1484,12 @@ void
zfs_create_fs(objset_t *os, cred_t *cr, nvlist_t *zplprops, dmu_tx_t *tx)
{
uint64_t moid, obj, sa_obj, version;
uint64_t sense = ZFS_CASE_SENSITIVE;
uint64_t norm = 0;
nvpair_t *elem;
int error;
#ifdef HAVE_ZPL
zfsvfs_t zfsvfs;
int i;
znode_t *rootzp = NULL;
vnode_t *vp;
vattr_t vattr;
znode_t *zp;
zfs_acl_ids_t acl_ids;
#else
timestruc_t now;
dmu_buf_t *db;
znode_phys_t *pzp;
#endif /* HAVE_ZPL */
/*
* First attempt to create master node.
@ -1536,8 +1525,6 @@ zfs_create_fs(objset_t *os, cred_t *cr, nvlist_t *zplprops, dmu_tx_t *tx)
ASSERT(error == 0);
if (strcmp(name, zfs_prop_to_name(ZFS_PROP_NORMALIZE)) == 0)
norm = val;
else if (strcmp(name, zfs_prop_to_name(ZFS_PROP_CASE)) == 0)
sense = val;
}
ASSERT(version != 0);
error = zap_update(os, moid, ZPL_VERSION_STR, 8, 1, &version, tx);
@ -1562,79 +1549,11 @@ zfs_create_fs(objset_t *os, cred_t *cr, nvlist_t *zplprops, dmu_tx_t *tx)
error = zap_add(os, moid, ZFS_UNLINKED_SET, 8, 1, &obj, tx);
ASSERT(error == 0);
#ifdef HAVE_ZPL
/*
* Create root znode. Create minimal znode/vnode/zfsvfs
* to allow zfs_mknode to work.
*/
vattr.va_mask = AT_MODE|AT_UID|AT_GID|AT_TYPE;
vattr.va_type = VDIR;
vattr.va_mode = S_IFDIR|0755;
vattr.va_uid = crgetuid(cr);
vattr.va_gid = crgetgid(cr);
rootzp = kmem_cache_alloc(znode_cache, KM_SLEEP);
ASSERT(!POINTER_IS_VALID(rootzp->z_zfsvfs));
rootzp->z_moved = 0;
rootzp->z_unlinked = 0;
rootzp->z_atime_dirty = 0;
rootzp->z_is_sa = USE_SA(version, os);
vp = ZTOV(rootzp);
vn_reinit(vp);
vp->v_type = VDIR;
bzero(&zfsvfs, sizeof (zfsvfs_t));
zfsvfs.z_os = os;
zfsvfs.z_parent = &zfsvfs;
zfsvfs.z_version = version;
zfsvfs.z_use_fuids = USE_FUIDS(version, os);
zfsvfs.z_use_sa = USE_SA(version, os);
zfsvfs.z_norm = norm;
error = sa_setup(os, sa_obj, zfs_attr_table, ZPL_END,
&zfsvfs.z_attr_table);
ASSERT(error == 0);
/*
* Fold case on file systems that are always or sometimes case
* insensitive.
*/
if (sense == ZFS_CASE_INSENSITIVE || sense == ZFS_CASE_MIXED)
zfsvfs.z_norm |= U8_TEXTPREP_TOUPPER;
/* XXX - This must be destroyed but I'm not quite sure yet so
* I'm just annotating that fact when it's an issue. -Brian */
mutex_init(&zfsvfs.z_znodes_lock, NULL, MUTEX_DEFAULT, NULL);
list_create(&zfsvfs.z_all_znodes, sizeof (znode_t),
offsetof(znode_t, z_link_node));
for (i = 0; i != ZFS_OBJ_MTX_SZ; i++)
mutex_init(&zfsvfs.z_hold_mtx[i], NULL, MUTEX_DEFAULT, NULL);
rootzp->z_zfsvfs = &zfsvfs;
VERIFY(0 == zfs_acl_ids_create(rootzp, IS_ROOT_NODE, &vattr,
cr, NULL, &acl_ids));
zfs_mknode(rootzp, &vattr, tx, cr, IS_ROOT_NODE, &zp, &acl_ids);
ASSERT3P(zp, ==, rootzp);
ASSERT(!vn_in_dnlc(ZTOV(rootzp))); /* not valid to move */
error = zap_add(os, moid, ZFS_ROOT_OBJ, 8, 1, &rootzp->z_id, tx);
ASSERT(error == 0);
zfs_acl_ids_free(&acl_ids);
POINTER_INVALIDATE(&rootzp->z_zfsvfs);
ZTOV(rootzp)->v_count = 0;
sa_handle_destroy(rootzp->z_sa_hdl);
kmem_cache_free(znode_cache, rootzp);
error = zfs_create_share_dir(&zfsvfs, tx);
for (i = 0; i != ZFS_OBJ_MTX_SZ; i++)
mutex_destroy(&zfsvfs.z_hold_mtx[i]);
#else
/*
* Create root znode with code free of VFS dependencies
* Create root znode with code free of VFS dependencies. This
* is important because without a registered filesystem and super
* block all the required VFS hooks will be missing. The critical
* thing is to just crete the required root znode.
*/
obj = zap_create_norm(os, norm, DMU_OT_DIRECTORY_CONTENTS,
DMU_OT_ZNODE, sizeof (znode_phys_t), tx);