xref: /illumos-gate/usr/src/uts/common/fs/zfs/zfs_znode.c (revision af2c4821c0a23e873f2a63bca4145080aa2183e3)
1fa9e4066Sahrens /*
2fa9e4066Sahrens  * CDDL HEADER START
3fa9e4066Sahrens  *
4fa9e4066Sahrens  * The contents of this file are subject to the terms of the
5ea8dc4b6Seschrock  * Common Development and Distribution License (the "License").
6ea8dc4b6Seschrock  * You may not use this file except in compliance with the License.
7fa9e4066Sahrens  *
8fa9e4066Sahrens  * You can obtain a copy of the license at usr/src/OPENSOLARIS.LICENSE
9fa9e4066Sahrens  * or http://www.opensolaris.org/os/licensing.
10fa9e4066Sahrens  * See the License for the specific language governing permissions
11fa9e4066Sahrens  * and limitations under the License.
12fa9e4066Sahrens  *
13fa9e4066Sahrens  * When distributing Covered Code, include this CDDL HEADER in each
14fa9e4066Sahrens  * file and include the License file at usr/src/OPENSOLARIS.LICENSE.
15fa9e4066Sahrens  * If applicable, add the following below this CDDL HEADER, with the
16fa9e4066Sahrens  * fields enclosed by brackets "[]" replaced with your own identifying
17fa9e4066Sahrens  * information: Portions Copyright [yyyy] [name of copyright owner]
18fa9e4066Sahrens  *
19fa9e4066Sahrens  * CDDL HEADER END
20fa9e4066Sahrens  */
21fa9e4066Sahrens /*
2255434c77Sek  * Copyright 2007 Sun Microsystems, Inc.  All rights reserved.
23fa9e4066Sahrens  * Use is subject to license terms.
24fa9e4066Sahrens  */
25fa9e4066Sahrens 
26fa9e4066Sahrens #pragma ident	"%Z%%M%	%I%	%E% SMI"
27fa9e4066Sahrens 
2855434c77Sek #ifdef _KERNEL
29fa9e4066Sahrens #include <sys/types.h>
30fa9e4066Sahrens #include <sys/param.h>
31fa9e4066Sahrens #include <sys/time.h>
32fa9e4066Sahrens #include <sys/systm.h>
33fa9e4066Sahrens #include <sys/sysmacros.h>
34fa9e4066Sahrens #include <sys/resource.h>
35fa9e4066Sahrens #include <sys/mntent.h>
3672fc53bcSmarks #include <sys/mkdev.h>
37fa9e4066Sahrens #include <sys/vfs.h>
38fa9e4066Sahrens #include <sys/vnode.h>
39fa9e4066Sahrens #include <sys/file.h>
40fa9e4066Sahrens #include <sys/kmem.h>
41fa9e4066Sahrens #include <sys/cmn_err.h>
42fa9e4066Sahrens #include <sys/errno.h>
43fa9e4066Sahrens #include <sys/unistd.h>
44fa9e4066Sahrens #include <sys/mode.h>
45fa9e4066Sahrens #include <sys/atomic.h>
46fa9e4066Sahrens #include <vm/pvn.h>
47fa9e4066Sahrens #include "fs/fs_subr.h"
48fa9e4066Sahrens #include <sys/zfs_dir.h>
49fa9e4066Sahrens #include <sys/zfs_acl.h>
50fa9e4066Sahrens #include <sys/zfs_ioctl.h>
51104e2ed7Sperrin #include <sys/zfs_rlock.h>
52fa9e4066Sahrens #include <sys/fs/zfs.h>
5355434c77Sek #endif /* _KERNEL */
5455434c77Sek 
5555434c77Sek #include <sys/dmu.h>
5655434c77Sek #include <sys/refcount.h>
5755434c77Sek #include <sys/stat.h>
5855434c77Sek #include <sys/zap.h>
5955434c77Sek #include <sys/zfs_znode.h>
60fa9e4066Sahrens 
6155434c77Sek /*
6255434c77Sek  * Functions needed for userland (ie: libzpool) are not put under
6355434c77Sek  * #ifdef_KERNEL; the rest of the functions have dependencies
6455434c77Sek  * (such as VFS logic) that will not compile easily in userland.
6555434c77Sek  */
6655434c77Sek #ifdef _KERNEL
67fa9e4066Sahrens struct kmem_cache *znode_cache = NULL;
68fa9e4066Sahrens 
69fa9e4066Sahrens /*ARGSUSED*/
70fa9e4066Sahrens static void
71fa9e4066Sahrens znode_pageout_func(dmu_buf_t *dbuf, void *user_ptr)
72fa9e4066Sahrens {
73fa9e4066Sahrens 	znode_t *zp = user_ptr;
74fa9e4066Sahrens 	vnode_t *vp = ZTOV(zp);
75fa9e4066Sahrens 
76ea8dc4b6Seschrock 	mutex_enter(&zp->z_lock);
77fa9e4066Sahrens 	if (vp->v_count == 0) {
78ea8dc4b6Seschrock 		mutex_exit(&zp->z_lock);
79fa9e4066Sahrens 		vn_invalid(vp);
80fa9e4066Sahrens 		zfs_znode_free(zp);
81ea8dc4b6Seschrock 	} else {
82ea8dc4b6Seschrock 		/* signal force unmount that this znode can be freed */
83ea8dc4b6Seschrock 		zp->z_dbuf = NULL;
84ea8dc4b6Seschrock 		mutex_exit(&zp->z_lock);
85fa9e4066Sahrens 	}
86fa9e4066Sahrens }
87fa9e4066Sahrens 
88fa9e4066Sahrens /*ARGSUSED*/
89fa9e4066Sahrens static int
90fa9e4066Sahrens zfs_znode_cache_constructor(void *buf, void *cdrarg, int kmflags)
91fa9e4066Sahrens {
92fa9e4066Sahrens 	znode_t *zp = buf;
93fa9e4066Sahrens 
94fa9e4066Sahrens 	zp->z_vnode = vn_alloc(KM_SLEEP);
95fa9e4066Sahrens 	zp->z_vnode->v_data = (caddr_t)zp;
96fa9e4066Sahrens 	mutex_init(&zp->z_lock, NULL, MUTEX_DEFAULT, NULL);
97fa9e4066Sahrens 	rw_init(&zp->z_map_lock, NULL, RW_DEFAULT, NULL);
98104e2ed7Sperrin 	rw_init(&zp->z_parent_lock, NULL, RW_DEFAULT, NULL);
99*af2c4821Smaybee 	rw_init(&zp->z_name_lock, NULL, RW_DEFAULT, NULL);
100fa9e4066Sahrens 	mutex_init(&zp->z_acl_lock, NULL, MUTEX_DEFAULT, NULL);
101104e2ed7Sperrin 
102104e2ed7Sperrin 	mutex_init(&zp->z_range_lock, NULL, MUTEX_DEFAULT, NULL);
103104e2ed7Sperrin 	avl_create(&zp->z_range_avl, zfs_range_compare,
104104e2ed7Sperrin 	    sizeof (rl_t), offsetof(rl_t, r_node));
105104e2ed7Sperrin 
106fa9e4066Sahrens 	zp->z_dbuf_held = 0;
107fa9e4066Sahrens 	zp->z_dirlocks = 0;
108fa9e4066Sahrens 	return (0);
109fa9e4066Sahrens }
110fa9e4066Sahrens 
111fa9e4066Sahrens /*ARGSUSED*/
112fa9e4066Sahrens static void
113fa9e4066Sahrens zfs_znode_cache_destructor(void *buf, void *cdarg)
114fa9e4066Sahrens {
115fa9e4066Sahrens 	znode_t *zp = buf;
116fa9e4066Sahrens 
117fa9e4066Sahrens 	ASSERT(zp->z_dirlocks == 0);
118fa9e4066Sahrens 	mutex_destroy(&zp->z_lock);
119fa9e4066Sahrens 	rw_destroy(&zp->z_map_lock);
120104e2ed7Sperrin 	rw_destroy(&zp->z_parent_lock);
121*af2c4821Smaybee 	rw_destroy(&zp->z_name_lock);
122fa9e4066Sahrens 	mutex_destroy(&zp->z_acl_lock);
123104e2ed7Sperrin 	avl_destroy(&zp->z_range_avl);
124fa9e4066Sahrens 
125fa9e4066Sahrens 	ASSERT(zp->z_dbuf_held == 0);
126fa9e4066Sahrens 	ASSERT(ZTOV(zp)->v_count == 0);
127fa9e4066Sahrens 	vn_free(ZTOV(zp));
128fa9e4066Sahrens }
129fa9e4066Sahrens 
130fa9e4066Sahrens void
131fa9e4066Sahrens zfs_znode_init(void)
132fa9e4066Sahrens {
133fa9e4066Sahrens 	/*
134fa9e4066Sahrens 	 * Initialize zcache
135fa9e4066Sahrens 	 */
136fa9e4066Sahrens 	ASSERT(znode_cache == NULL);
137fa9e4066Sahrens 	znode_cache = kmem_cache_create("zfs_znode_cache",
138fa9e4066Sahrens 	    sizeof (znode_t), 0, zfs_znode_cache_constructor,
139fa9e4066Sahrens 	    zfs_znode_cache_destructor, NULL, NULL, NULL, 0);
140fa9e4066Sahrens }
141fa9e4066Sahrens 
142fa9e4066Sahrens void
143fa9e4066Sahrens zfs_znode_fini(void)
144fa9e4066Sahrens {
145fa9e4066Sahrens 	/*
146fa9e4066Sahrens 	 * Cleanup vfs & vnode ops
147fa9e4066Sahrens 	 */
148fa9e4066Sahrens 	zfs_remove_op_tables();
149fa9e4066Sahrens 
150fa9e4066Sahrens 	/*
151fa9e4066Sahrens 	 * Cleanup zcache
152fa9e4066Sahrens 	 */
153fa9e4066Sahrens 	if (znode_cache)
154fa9e4066Sahrens 		kmem_cache_destroy(znode_cache);
155fa9e4066Sahrens 	znode_cache = NULL;
156fa9e4066Sahrens }
157fa9e4066Sahrens 
158fa9e4066Sahrens struct vnodeops *zfs_dvnodeops;
159fa9e4066Sahrens struct vnodeops *zfs_fvnodeops;
160fa9e4066Sahrens struct vnodeops *zfs_symvnodeops;
161fa9e4066Sahrens struct vnodeops *zfs_xdvnodeops;
162fa9e4066Sahrens struct vnodeops *zfs_evnodeops;
163fa9e4066Sahrens 
164fa9e4066Sahrens void
165fa9e4066Sahrens zfs_remove_op_tables()
166fa9e4066Sahrens {
167fa9e4066Sahrens 	/*
168fa9e4066Sahrens 	 * Remove vfs ops
169fa9e4066Sahrens 	 */
170fa9e4066Sahrens 	ASSERT(zfsfstype);
171fa9e4066Sahrens 	(void) vfs_freevfsops_by_type(zfsfstype);
172fa9e4066Sahrens 	zfsfstype = 0;
173fa9e4066Sahrens 
174fa9e4066Sahrens 	/*
175fa9e4066Sahrens 	 * Remove vnode ops
176fa9e4066Sahrens 	 */
177fa9e4066Sahrens 	if (zfs_dvnodeops)
178fa9e4066Sahrens 		vn_freevnodeops(zfs_dvnodeops);
179fa9e4066Sahrens 	if (zfs_fvnodeops)
180fa9e4066Sahrens 		vn_freevnodeops(zfs_fvnodeops);
181fa9e4066Sahrens 	if (zfs_symvnodeops)
182fa9e4066Sahrens 		vn_freevnodeops(zfs_symvnodeops);
183fa9e4066Sahrens 	if (zfs_xdvnodeops)
184fa9e4066Sahrens 		vn_freevnodeops(zfs_xdvnodeops);
185fa9e4066Sahrens 	if (zfs_evnodeops)
186fa9e4066Sahrens 		vn_freevnodeops(zfs_evnodeops);
187fa9e4066Sahrens 
188fa9e4066Sahrens 	zfs_dvnodeops = NULL;
189fa9e4066Sahrens 	zfs_fvnodeops = NULL;
190fa9e4066Sahrens 	zfs_symvnodeops = NULL;
191fa9e4066Sahrens 	zfs_xdvnodeops = NULL;
192fa9e4066Sahrens 	zfs_evnodeops = NULL;
193fa9e4066Sahrens }
194fa9e4066Sahrens 
195fa9e4066Sahrens extern const fs_operation_def_t zfs_dvnodeops_template[];
196fa9e4066Sahrens extern const fs_operation_def_t zfs_fvnodeops_template[];
197fa9e4066Sahrens extern const fs_operation_def_t zfs_xdvnodeops_template[];
198fa9e4066Sahrens extern const fs_operation_def_t zfs_symvnodeops_template[];
199fa9e4066Sahrens extern const fs_operation_def_t zfs_evnodeops_template[];
200fa9e4066Sahrens 
201fa9e4066Sahrens int
202fa9e4066Sahrens zfs_create_op_tables()
203fa9e4066Sahrens {
204fa9e4066Sahrens 	int error;
205fa9e4066Sahrens 
206fa9e4066Sahrens 	/*
207fa9e4066Sahrens 	 * zfs_dvnodeops can be set if mod_remove() calls mod_installfs()
208fa9e4066Sahrens 	 * due to a failure to remove the the 2nd modlinkage (zfs_modldrv).
209fa9e4066Sahrens 	 * In this case we just return as the ops vectors are already set up.
210fa9e4066Sahrens 	 */
211fa9e4066Sahrens 	if (zfs_dvnodeops)
212fa9e4066Sahrens 		return (0);
213fa9e4066Sahrens 
214fa9e4066Sahrens 	error = vn_make_ops(MNTTYPE_ZFS, zfs_dvnodeops_template,
215fa9e4066Sahrens 	    &zfs_dvnodeops);
216fa9e4066Sahrens 	if (error)
217fa9e4066Sahrens 		return (error);
218fa9e4066Sahrens 
219fa9e4066Sahrens 	error = vn_make_ops(MNTTYPE_ZFS, zfs_fvnodeops_template,
220fa9e4066Sahrens 	    &zfs_fvnodeops);
221fa9e4066Sahrens 	if (error)
222fa9e4066Sahrens 		return (error);
223fa9e4066Sahrens 
224fa9e4066Sahrens 	error = vn_make_ops(MNTTYPE_ZFS, zfs_symvnodeops_template,
225fa9e4066Sahrens 	    &zfs_symvnodeops);
226fa9e4066Sahrens 	if (error)
227fa9e4066Sahrens 		return (error);
228fa9e4066Sahrens 
229fa9e4066Sahrens 	error = vn_make_ops(MNTTYPE_ZFS, zfs_xdvnodeops_template,
230fa9e4066Sahrens 	    &zfs_xdvnodeops);
231fa9e4066Sahrens 	if (error)
232fa9e4066Sahrens 		return (error);
233fa9e4066Sahrens 
234fa9e4066Sahrens 	error = vn_make_ops(MNTTYPE_ZFS, zfs_evnodeops_template,
235fa9e4066Sahrens 	    &zfs_evnodeops);
236fa9e4066Sahrens 
237fa9e4066Sahrens 	return (error);
238fa9e4066Sahrens }
239fa9e4066Sahrens 
240fa9e4066Sahrens /*
241fa9e4066Sahrens  * zfs_init_fs - Initialize the zfsvfs struct and the file system
242fa9e4066Sahrens  *	incore "master" object.  Verify version compatibility.
243fa9e4066Sahrens  */
244fa9e4066Sahrens int
245fa9e4066Sahrens zfs_init_fs(zfsvfs_t *zfsvfs, znode_t **zpp, cred_t *cr)
246fa9e4066Sahrens {
247fa9e4066Sahrens 	extern int zfsfstype;
248fa9e4066Sahrens 
249fa9e4066Sahrens 	objset_t	*os = zfsvfs->z_os;
250eaca9bbdSeschrock 	uint64_t	version = ZPL_VERSION;
251fa9e4066Sahrens 	int		i, error;
252fa9e4066Sahrens 	dmu_object_info_t doi;
253a2eea2e1Sahrens 	uint64_t fsid_guid;
254fa9e4066Sahrens 
255fa9e4066Sahrens 	*zpp = NULL;
256fa9e4066Sahrens 
257fa9e4066Sahrens 	/*
258fa9e4066Sahrens 	 * XXX - hack to auto-create the pool root filesystem at
259fa9e4066Sahrens 	 * the first attempted mount.
260fa9e4066Sahrens 	 */
261fa9e4066Sahrens 	if (dmu_object_info(os, MASTER_NODE_OBJ, &doi) == ENOENT) {
262fa9e4066Sahrens 		dmu_tx_t *tx = dmu_tx_create(os);
263fa9e4066Sahrens 
264ea8dc4b6Seschrock 		dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, TRUE, NULL); /* master */
265ea8dc4b6Seschrock 		dmu_tx_hold_zap(tx, DMU_NEW_OBJECT, TRUE, NULL); /* del queue */
266fa9e4066Sahrens 		dmu_tx_hold_bonus(tx, DMU_NEW_OBJECT); /* root node */
267fa9e4066Sahrens 		error = dmu_tx_assign(tx, TXG_WAIT);
268fa9e4066Sahrens 		ASSERT3U(error, ==, 0);
269fa9e4066Sahrens 		zfs_create_fs(os, cr, tx);
270fa9e4066Sahrens 		dmu_tx_commit(tx);
271fa9e4066Sahrens 	}
272fa9e4066Sahrens 
273eaca9bbdSeschrock 	error = zap_lookup(os, MASTER_NODE_OBJ, ZPL_VERSION_OBJ, 8, 1,
274ea8dc4b6Seschrock 	    &version);
275ea8dc4b6Seschrock 	if (error) {
276ea8dc4b6Seschrock 		return (error);
277eaca9bbdSeschrock 	} else if (version != ZPL_VERSION) {
278fa9e4066Sahrens 		(void) printf("Mismatched versions:  File system "
279fa9e4066Sahrens 		    "is version %lld on-disk format, which is "
280fa9e4066Sahrens 		    "incompatible with this software version %lld!",
281eaca9bbdSeschrock 		    (u_longlong_t)version, ZPL_VERSION);
282fa9e4066Sahrens 		return (ENOTSUP);
283fa9e4066Sahrens 	}
284fa9e4066Sahrens 
285fa9e4066Sahrens 	/*
286fa9e4066Sahrens 	 * The fsid is 64 bits, composed of an 8-bit fs type, which
287fa9e4066Sahrens 	 * separates our fsid from any other filesystem types, and a
288fa9e4066Sahrens 	 * 56-bit objset unique ID.  The objset unique ID is unique to
289fa9e4066Sahrens 	 * all objsets open on this system, provided by unique_create().
290fa9e4066Sahrens 	 * The 8-bit fs type must be put in the low bits of fsid[1]
291fa9e4066Sahrens 	 * because that's where other Solaris filesystems put it.
292fa9e4066Sahrens 	 */
293a2eea2e1Sahrens 	fsid_guid = dmu_objset_fsid_guid(os);
294a2eea2e1Sahrens 	ASSERT((fsid_guid & ~((1ULL<<56)-1)) == 0);
295a2eea2e1Sahrens 	zfsvfs->z_vfs->vfs_fsid.val[0] = fsid_guid;
296a2eea2e1Sahrens 	zfsvfs->z_vfs->vfs_fsid.val[1] = ((fsid_guid>>32) << 8) |
297fa9e4066Sahrens 	    zfsfstype & 0xFF;
298fa9e4066Sahrens 
299893a6d32Sahrens 	error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_ROOT_OBJ, 8, 1,
300893a6d32Sahrens 	    &zfsvfs->z_root);
301ea8dc4b6Seschrock 	if (error)
302ea8dc4b6Seschrock 		return (error);
303893a6d32Sahrens 	ASSERT(zfsvfs->z_root != 0);
304fa9e4066Sahrens 
305fa9e4066Sahrens 	/*
306fa9e4066Sahrens 	 * Create the per mount vop tables.
307fa9e4066Sahrens 	 */
308fa9e4066Sahrens 
309fa9e4066Sahrens 	/*
310fa9e4066Sahrens 	 * Initialize zget mutex's
311fa9e4066Sahrens 	 */
312fa9e4066Sahrens 	for (i = 0; i != ZFS_OBJ_MTX_SZ; i++)
313fa9e4066Sahrens 		mutex_init(&zfsvfs->z_hold_mtx[i], NULL, MUTEX_DEFAULT, NULL);
314fa9e4066Sahrens 
315893a6d32Sahrens 	error = zfs_zget(zfsvfs, zfsvfs->z_root, zpp);
316fa9e4066Sahrens 	if (error)
317fa9e4066Sahrens 		return (error);
318893a6d32Sahrens 	ASSERT3U((*zpp)->z_id, ==, zfsvfs->z_root);
319fa9e4066Sahrens 
320893a6d32Sahrens 	error = zap_lookup(os, MASTER_NODE_OBJ, ZFS_UNLINKED_SET, 8, 1,
321893a6d32Sahrens 	    &zfsvfs->z_unlinkedobj);
322ea8dc4b6Seschrock 	if (error)
323ea8dc4b6Seschrock 		return (error);
324fa9e4066Sahrens 
325fa9e4066Sahrens 	return (0);
326fa9e4066Sahrens }
327fa9e4066Sahrens 
32872fc53bcSmarks /*
32972fc53bcSmarks  * define a couple of values we need available
33072fc53bcSmarks  * for both 64 and 32 bit environments.
33172fc53bcSmarks  */
33272fc53bcSmarks #ifndef NBITSMINOR64
33372fc53bcSmarks #define	NBITSMINOR64	32
33472fc53bcSmarks #endif
33572fc53bcSmarks #ifndef MAXMAJ64
33672fc53bcSmarks #define	MAXMAJ64	0xffffffffUL
33772fc53bcSmarks #endif
33872fc53bcSmarks #ifndef	MAXMIN64
33972fc53bcSmarks #define	MAXMIN64	0xffffffffUL
34072fc53bcSmarks #endif
34172fc53bcSmarks 
34272fc53bcSmarks /*
34372fc53bcSmarks  * Create special expldev for ZFS private use.
34472fc53bcSmarks  * Can't use standard expldev since it doesn't do
34572fc53bcSmarks  * what we want.  The standard expldev() takes a
34672fc53bcSmarks  * dev32_t in LP64 and expands it to a long dev_t.
34772fc53bcSmarks  * We need an interface that takes a dev32_t in ILP32
34872fc53bcSmarks  * and expands it to a long dev_t.
34972fc53bcSmarks  */
35072fc53bcSmarks static uint64_t
35172fc53bcSmarks zfs_expldev(dev_t dev)
35272fc53bcSmarks {
35372fc53bcSmarks #ifndef _LP64
35472fc53bcSmarks 	major_t major = (major_t)dev >> NBITSMINOR32 & MAXMAJ32;
35572fc53bcSmarks 	return (((uint64_t)major << NBITSMINOR64) |
35672fc53bcSmarks 	    ((minor_t)dev & MAXMIN32));
35772fc53bcSmarks #else
35872fc53bcSmarks 	return (dev);
35972fc53bcSmarks #endif
36072fc53bcSmarks }
36172fc53bcSmarks 
36272fc53bcSmarks /*
36372fc53bcSmarks  * Special cmpldev for ZFS private use.
36472fc53bcSmarks  * Can't use standard cmpldev since it takes
36572fc53bcSmarks  * a long dev_t and compresses it to dev32_t in
36672fc53bcSmarks  * LP64.  We need to do a compaction of a long dev_t
36772fc53bcSmarks  * to a dev32_t in ILP32.
36872fc53bcSmarks  */
36972fc53bcSmarks dev_t
37072fc53bcSmarks zfs_cmpldev(uint64_t dev)
37172fc53bcSmarks {
37272fc53bcSmarks #ifndef _LP64
37372fc53bcSmarks 	minor_t minor = (minor_t)dev & MAXMIN64;
37472fc53bcSmarks 	major_t major = (major_t)(dev >> NBITSMINOR64) & MAXMAJ64;
37572fc53bcSmarks 
37672fc53bcSmarks 	if (major > MAXMAJ32 || minor > MAXMIN32)
37772fc53bcSmarks 		return (NODEV32);
37872fc53bcSmarks 
37972fc53bcSmarks 	return (((dev32_t)major << NBITSMINOR32) | minor);
38072fc53bcSmarks #else
38172fc53bcSmarks 	return (dev);
38272fc53bcSmarks #endif
38372fc53bcSmarks }
38472fc53bcSmarks 
385fa9e4066Sahrens /*
386fa9e4066Sahrens  * Construct a new znode/vnode and intialize.
387fa9e4066Sahrens  *
388fa9e4066Sahrens  * This does not do a call to dmu_set_user() that is
389fa9e4066Sahrens  * up to the caller to do, in case you don't want to
390fa9e4066Sahrens  * return the znode
391fa9e4066Sahrens  */
392ea8dc4b6Seschrock static znode_t *
393fa9e4066Sahrens zfs_znode_alloc(zfsvfs_t *zfsvfs, dmu_buf_t *db, uint64_t obj_num, int blksz)
394fa9e4066Sahrens {
395fa9e4066Sahrens 	znode_t	*zp;
396fa9e4066Sahrens 	vnode_t *vp;
397fa9e4066Sahrens 
398fa9e4066Sahrens 	zp = kmem_cache_alloc(znode_cache, KM_SLEEP);
399fa9e4066Sahrens 
400fa9e4066Sahrens 	ASSERT(zp->z_dirlocks == NULL);
401fa9e4066Sahrens 
402fa9e4066Sahrens 	zp->z_phys = db->db_data;
403fa9e4066Sahrens 	zp->z_zfsvfs = zfsvfs;
404893a6d32Sahrens 	zp->z_unlinked = 0;
405fa9e4066Sahrens 	zp->z_atime_dirty = 0;
406fa9e4066Sahrens 	zp->z_dbuf_held = 0;
407fa9e4066Sahrens 	zp->z_mapcnt = 0;
408fa9e4066Sahrens 	zp->z_last_itx = 0;
409fa9e4066Sahrens 	zp->z_dbuf = db;
410fa9e4066Sahrens 	zp->z_id = obj_num;
411fa9e4066Sahrens 	zp->z_blksz = blksz;
412fa9e4066Sahrens 	zp->z_seq = 0x7A4653;
41367bd71c6Sperrin 	zp->z_sync_cnt = 0;
414fa9e4066Sahrens 
415fa9e4066Sahrens 	mutex_enter(&zfsvfs->z_znodes_lock);
416fa9e4066Sahrens 	list_insert_tail(&zfsvfs->z_all_znodes, zp);
417fa9e4066Sahrens 	mutex_exit(&zfsvfs->z_znodes_lock);
418fa9e4066Sahrens 
419fa9e4066Sahrens 	vp = ZTOV(zp);
420fa9e4066Sahrens 	vn_reinit(vp);
421fa9e4066Sahrens 
422fa9e4066Sahrens 	vp->v_vfsp = zfsvfs->z_parent->z_vfs;
423fa9e4066Sahrens 	vp->v_type = IFTOVT((mode_t)zp->z_phys->zp_mode);
424fa9e4066Sahrens 
425fa9e4066Sahrens 	switch (vp->v_type) {
426fa9e4066Sahrens 	case VDIR:
427fa9e4066Sahrens 		if (zp->z_phys->zp_flags & ZFS_XATTR) {
428fa9e4066Sahrens 			vn_setops(vp, zfs_xdvnodeops);
429fa9e4066Sahrens 			vp->v_flag |= V_XATTRDIR;
430fa9e4066Sahrens 		} else
431fa9e4066Sahrens 			vn_setops(vp, zfs_dvnodeops);
4327f6e3e7dSperrin 		zp->z_zn_prefetch = B_TRUE; /* z_prefetch default is enabled */
433fa9e4066Sahrens 		break;
434fa9e4066Sahrens 	case VBLK:
435fa9e4066Sahrens 	case VCHR:
43672fc53bcSmarks 		vp->v_rdev = zfs_cmpldev(zp->z_phys->zp_rdev);
437fa9e4066Sahrens 		/*FALLTHROUGH*/
438fa9e4066Sahrens 	case VFIFO:
439fa9e4066Sahrens 	case VSOCK:
440fa9e4066Sahrens 	case VDOOR:
441fa9e4066Sahrens 		vn_setops(vp, zfs_fvnodeops);
442fa9e4066Sahrens 		break;
443fa9e4066Sahrens 	case VREG:
444fa9e4066Sahrens 		vp->v_flag |= VMODSORT;
445fa9e4066Sahrens 		vn_setops(vp, zfs_fvnodeops);
446fa9e4066Sahrens 		break;
447fa9e4066Sahrens 	case VLNK:
448fa9e4066Sahrens 		vn_setops(vp, zfs_symvnodeops);
449fa9e4066Sahrens 		break;
450fa9e4066Sahrens 	default:
451fa9e4066Sahrens 		vn_setops(vp, zfs_evnodeops);
452fa9e4066Sahrens 		break;
453fa9e4066Sahrens 	}
454fa9e4066Sahrens 
455fa9e4066Sahrens 	return (zp);
456fa9e4066Sahrens }
457fa9e4066Sahrens 
458fa9e4066Sahrens static void
459fa9e4066Sahrens zfs_znode_dmu_init(znode_t *zp)
460fa9e4066Sahrens {
461fa9e4066Sahrens 	znode_t		*nzp;
462fa9e4066Sahrens 	zfsvfs_t	*zfsvfs = zp->z_zfsvfs;
463fa9e4066Sahrens 	dmu_buf_t	*db = zp->z_dbuf;
464fa9e4066Sahrens 
465fa9e4066Sahrens 	mutex_enter(&zp->z_lock);
466fa9e4066Sahrens 
467fa9e4066Sahrens 	nzp = dmu_buf_set_user(db, zp, &zp->z_phys, znode_pageout_func);
468fa9e4066Sahrens 
469fa9e4066Sahrens 	/*
470fa9e4066Sahrens 	 * there should be no
471fa9e4066Sahrens 	 * concurrent zgets on this object.
472fa9e4066Sahrens 	 */
473fa9e4066Sahrens 	ASSERT3P(nzp, ==, NULL);
474fa9e4066Sahrens 
475fa9e4066Sahrens 	/*
476fa9e4066Sahrens 	 * Slap on VROOT if we are the root znode
477fa9e4066Sahrens 	 */
478fa9e4066Sahrens 	if (zp->z_id == zfsvfs->z_root) {
479fa9e4066Sahrens 		ZTOV(zp)->v_flag |= VROOT;
480fa9e4066Sahrens 	}
481fa9e4066Sahrens 
482fa9e4066Sahrens 	ASSERT(zp->z_dbuf_held == 0);
483fa9e4066Sahrens 	zp->z_dbuf_held = 1;
484fa9e4066Sahrens 	VFS_HOLD(zfsvfs->z_vfs);
485fa9e4066Sahrens 	mutex_exit(&zp->z_lock);
486fa9e4066Sahrens 	vn_exists(ZTOV(zp));
487fa9e4066Sahrens }
488fa9e4066Sahrens 
489fa9e4066Sahrens /*
490fa9e4066Sahrens  * Create a new DMU object to hold a zfs znode.
491fa9e4066Sahrens  *
492fa9e4066Sahrens  *	IN:	dzp	- parent directory for new znode
493fa9e4066Sahrens  *		vap	- file attributes for new znode
494fa9e4066Sahrens  *		tx	- dmu transaction id for zap operations
495fa9e4066Sahrens  *		cr	- credentials of caller
496fa9e4066Sahrens  *		flag	- flags:
497fa9e4066Sahrens  *			  IS_ROOT_NODE	- new object will be root
498fa9e4066Sahrens  *			  IS_XATTR	- new object is an attribute
499fa9e4066Sahrens  *			  IS_REPLAY	- intent log replay
500fa9e4066Sahrens  *
501fa9e4066Sahrens  *	OUT:	oid	- ID of created object
502fa9e4066Sahrens  *
503fa9e4066Sahrens  */
504fa9e4066Sahrens void
505fa9e4066Sahrens zfs_mknode(znode_t *dzp, vattr_t *vap, uint64_t *oid, dmu_tx_t *tx, cred_t *cr,
506fa9e4066Sahrens 	uint_t flag, znode_t **zpp, int bonuslen)
507fa9e4066Sahrens {
508fa9e4066Sahrens 	dmu_buf_t	*dbp;
509fa9e4066Sahrens 	znode_phys_t	*pzp;
510fa9e4066Sahrens 	znode_t		*zp;
511fa9e4066Sahrens 	zfsvfs_t	*zfsvfs = dzp->z_zfsvfs;
512fa9e4066Sahrens 	timestruc_t	now;
513fa9e4066Sahrens 	uint64_t	gen;
514fa9e4066Sahrens 	int		err;
515fa9e4066Sahrens 
516fa9e4066Sahrens 	ASSERT(vap && (vap->va_mask & (AT_TYPE|AT_MODE)) == (AT_TYPE|AT_MODE));
517fa9e4066Sahrens 
518fa9e4066Sahrens 	if (zfsvfs->z_assign >= TXG_INITIAL) {		/* ZIL replay */
519fa9e4066Sahrens 		*oid = vap->va_nodeid;
520fa9e4066Sahrens 		flag |= IS_REPLAY;
521fa9e4066Sahrens 		now = vap->va_ctime;		/* see zfs_replay_create() */
522fa9e4066Sahrens 		gen = vap->va_nblocks;		/* ditto */
523fa9e4066Sahrens 	} else {
524fa9e4066Sahrens 		*oid = 0;
525fa9e4066Sahrens 		gethrestime(&now);
526fa9e4066Sahrens 		gen = dmu_tx_get_txg(tx);
527fa9e4066Sahrens 	}
528fa9e4066Sahrens 
529fa9e4066Sahrens 	/*
530fa9e4066Sahrens 	 * Create a new DMU object.
531fa9e4066Sahrens 	 */
532ea8dc4b6Seschrock 	/*
533ea8dc4b6Seschrock 	 * There's currently no mechanism for pre-reading the blocks that will
534ea8dc4b6Seschrock 	 * be to needed allocate a new object, so we accept the small chance
535ea8dc4b6Seschrock 	 * that there will be an i/o error and we will fail one of the
536ea8dc4b6Seschrock 	 * assertions below.
537ea8dc4b6Seschrock 	 */
538fa9e4066Sahrens 	if (vap->va_type == VDIR) {
539fa9e4066Sahrens 		if (flag & IS_REPLAY) {
540fa9e4066Sahrens 			err = zap_create_claim(zfsvfs->z_os, *oid,
541fa9e4066Sahrens 			    DMU_OT_DIRECTORY_CONTENTS,
542fa9e4066Sahrens 			    DMU_OT_ZNODE, sizeof (znode_phys_t) + bonuslen, tx);
543fa9e4066Sahrens 			ASSERT3U(err, ==, 0);
544fa9e4066Sahrens 		} else {
545fa9e4066Sahrens 			*oid = zap_create(zfsvfs->z_os,
546fa9e4066Sahrens 			    DMU_OT_DIRECTORY_CONTENTS,
547fa9e4066Sahrens 			    DMU_OT_ZNODE, sizeof (znode_phys_t) + bonuslen, tx);
548fa9e4066Sahrens 		}
549fa9e4066Sahrens 	} else {
550fa9e4066Sahrens 		if (flag & IS_REPLAY) {
551fa9e4066Sahrens 			err = dmu_object_claim(zfsvfs->z_os, *oid,
552fa9e4066Sahrens 			    DMU_OT_PLAIN_FILE_CONTENTS, 0,
553fa9e4066Sahrens 			    DMU_OT_ZNODE, sizeof (znode_phys_t) + bonuslen, tx);
554fa9e4066Sahrens 			ASSERT3U(err, ==, 0);
555fa9e4066Sahrens 		} else {
556fa9e4066Sahrens 			*oid = dmu_object_alloc(zfsvfs->z_os,
557fa9e4066Sahrens 			    DMU_OT_PLAIN_FILE_CONTENTS, 0,
558fa9e4066Sahrens 			    DMU_OT_ZNODE, sizeof (znode_phys_t) + bonuslen, tx);
559fa9e4066Sahrens 		}
560fa9e4066Sahrens 	}
561ea8dc4b6Seschrock 	VERIFY(0 == dmu_bonus_hold(zfsvfs->z_os, *oid, NULL, &dbp));
562fa9e4066Sahrens 	dmu_buf_will_dirty(dbp, tx);
563fa9e4066Sahrens 
564fa9e4066Sahrens 	/*
565fa9e4066Sahrens 	 * Initialize the znode physical data to zero.
566fa9e4066Sahrens 	 */
567fa9e4066Sahrens 	ASSERT(dbp->db_size >= sizeof (znode_phys_t));
568fa9e4066Sahrens 	bzero(dbp->db_data, dbp->db_size);
569fa9e4066Sahrens 	pzp = dbp->db_data;
570fa9e4066Sahrens 
571fa9e4066Sahrens 	/*
572fa9e4066Sahrens 	 * If this is the root, fix up the half-initialized parent pointer
573fa9e4066Sahrens 	 * to reference the just-allocated physical data area.
574fa9e4066Sahrens 	 */
575fa9e4066Sahrens 	if (flag & IS_ROOT_NODE) {
576fa9e4066Sahrens 		dzp->z_phys = pzp;
577fa9e4066Sahrens 		dzp->z_id = *oid;
578fa9e4066Sahrens 	}
579fa9e4066Sahrens 
580fa9e4066Sahrens 	/*
581fa9e4066Sahrens 	 * If parent is an xattr, so am I.
582fa9e4066Sahrens 	 */
583fa9e4066Sahrens 	if (dzp->z_phys->zp_flags & ZFS_XATTR)
584fa9e4066Sahrens 		flag |= IS_XATTR;
585fa9e4066Sahrens 
586fa9e4066Sahrens 	if (vap->va_type == VBLK || vap->va_type == VCHR) {
58772fc53bcSmarks 		pzp->zp_rdev = zfs_expldev(vap->va_rdev);
588fa9e4066Sahrens 	}
589fa9e4066Sahrens 
590fa9e4066Sahrens 	if (vap->va_type == VDIR) {
591fa9e4066Sahrens 		pzp->zp_size = 2;		/* contents ("." and "..") */
592fa9e4066Sahrens 		pzp->zp_links = (flag & (IS_ROOT_NODE | IS_XATTR)) ? 2 : 1;
593fa9e4066Sahrens 	}
594fa9e4066Sahrens 
595fa9e4066Sahrens 	pzp->zp_parent = dzp->z_id;
596fa9e4066Sahrens 	if (flag & IS_XATTR)
597fa9e4066Sahrens 		pzp->zp_flags |= ZFS_XATTR;
598fa9e4066Sahrens 
599fa9e4066Sahrens 	pzp->zp_gen = gen;
600fa9e4066Sahrens 
601fa9e4066Sahrens 	ZFS_TIME_ENCODE(&now, pzp->zp_crtime);
602fa9e4066Sahrens 	ZFS_TIME_ENCODE(&now, pzp->zp_ctime);
603fa9e4066Sahrens 
604fa9e4066Sahrens 	if (vap->va_mask & AT_ATIME) {
605fa9e4066Sahrens 		ZFS_TIME_ENCODE(&vap->va_atime, pzp->zp_atime);
606fa9e4066Sahrens 	} else {
607fa9e4066Sahrens 		ZFS_TIME_ENCODE(&now, pzp->zp_atime);
608fa9e4066Sahrens 	}
609fa9e4066Sahrens 
610fa9e4066Sahrens 	if (vap->va_mask & AT_MTIME) {
611fa9e4066Sahrens 		ZFS_TIME_ENCODE(&vap->va_mtime, pzp->zp_mtime);
612fa9e4066Sahrens 	} else {
613fa9e4066Sahrens 		ZFS_TIME_ENCODE(&now, pzp->zp_mtime);
614fa9e4066Sahrens 	}
615fa9e4066Sahrens 
616fa9e4066Sahrens 	pzp->zp_mode = MAKEIMODE(vap->va_type, vap->va_mode);
617fa9e4066Sahrens 	zp = zfs_znode_alloc(zfsvfs, dbp, *oid, 0);
618fa9e4066Sahrens 
619fa9e4066Sahrens 	zfs_perm_init(zp, dzp, flag, vap, tx, cr);
620fa9e4066Sahrens 
621fa9e4066Sahrens 	if (zpp) {
622fa9e4066Sahrens 		kmutex_t *hash_mtx = ZFS_OBJ_MUTEX(zp);
623fa9e4066Sahrens 
624fa9e4066Sahrens 		mutex_enter(hash_mtx);
625fa9e4066Sahrens 		zfs_znode_dmu_init(zp);
626ea8dc4b6Seschrock 		mutex_exit(hash_mtx);
627ea8dc4b6Seschrock 
628fa9e4066Sahrens 		*zpp = zp;
629fa9e4066Sahrens 	} else {
630fa9e4066Sahrens 		ZTOV(zp)->v_count = 0;
631ea8dc4b6Seschrock 		dmu_buf_rele(dbp, NULL);
632fa9e4066Sahrens 		zfs_znode_free(zp);
633fa9e4066Sahrens 	}
634fa9e4066Sahrens }
635fa9e4066Sahrens 
636fa9e4066Sahrens int
637fa9e4066Sahrens zfs_zget(zfsvfs_t *zfsvfs, uint64_t obj_num, znode_t **zpp)
638fa9e4066Sahrens {
639fa9e4066Sahrens 	dmu_object_info_t doi;
640fa9e4066Sahrens 	dmu_buf_t	*db;
641fa9e4066Sahrens 	znode_t		*zp;
642ea8dc4b6Seschrock 	int err;
643fa9e4066Sahrens 
644fa9e4066Sahrens 	*zpp = NULL;
645fa9e4066Sahrens 
646fa9e4066Sahrens 	ZFS_OBJ_HOLD_ENTER(zfsvfs, obj_num);
647fa9e4066Sahrens 
648ea8dc4b6Seschrock 	err = dmu_bonus_hold(zfsvfs->z_os, obj_num, NULL, &db);
649ea8dc4b6Seschrock 	if (err) {
650fa9e4066Sahrens 		ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
651ea8dc4b6Seschrock 		return (err);
652fa9e4066Sahrens 	}
653fa9e4066Sahrens 
654fa9e4066Sahrens 	dmu_object_info_from_db(db, &doi);
655fa9e4066Sahrens 	if (doi.doi_bonus_type != DMU_OT_ZNODE ||
656fa9e4066Sahrens 	    doi.doi_bonus_size < sizeof (znode_phys_t)) {
657ea8dc4b6Seschrock 		dmu_buf_rele(db, NULL);
658fa9e4066Sahrens 		ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
659fa9e4066Sahrens 		return (EINVAL);
660fa9e4066Sahrens 	}
661fa9e4066Sahrens 
662fa9e4066Sahrens 	ASSERT(db->db_object == obj_num);
663fa9e4066Sahrens 	ASSERT(db->db_offset == -1);
664fa9e4066Sahrens 	ASSERT(db->db_data != NULL);
665fa9e4066Sahrens 
666fa9e4066Sahrens 	zp = dmu_buf_get_user(db);
667fa9e4066Sahrens 
668fa9e4066Sahrens 	if (zp != NULL) {
669fa9e4066Sahrens 		mutex_enter(&zp->z_lock);
670fa9e4066Sahrens 
671fa9e4066Sahrens 		ASSERT3U(zp->z_id, ==, obj_num);
672893a6d32Sahrens 		if (zp->z_unlinked) {
673ea8dc4b6Seschrock 			dmu_buf_rele(db, NULL);
674fa9e4066Sahrens 			mutex_exit(&zp->z_lock);
675fa9e4066Sahrens 			ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
676fa9e4066Sahrens 			return (ENOENT);
677fa9e4066Sahrens 		} else if (zp->z_dbuf_held) {
678ea8dc4b6Seschrock 			dmu_buf_rele(db, NULL);
679fa9e4066Sahrens 		} else {
680fa9e4066Sahrens 			zp->z_dbuf_held = 1;
681fa9e4066Sahrens 			VFS_HOLD(zfsvfs->z_vfs);
682fa9e4066Sahrens 		}
683fa9e4066Sahrens 
684ea8dc4b6Seschrock 
685fa9e4066Sahrens 		VN_HOLD(ZTOV(zp));
686fa9e4066Sahrens 		mutex_exit(&zp->z_lock);
687ea8dc4b6Seschrock 		ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
688fa9e4066Sahrens 		*zpp = zp;
689fa9e4066Sahrens 		return (0);
690fa9e4066Sahrens 	}
691fa9e4066Sahrens 
692fa9e4066Sahrens 	/*
693fa9e4066Sahrens 	 * Not found create new znode/vnode
694fa9e4066Sahrens 	 */
695fa9e4066Sahrens 	zp = zfs_znode_alloc(zfsvfs, db, obj_num, doi.doi_data_block_size);
696fa9e4066Sahrens 	ASSERT3U(zp->z_id, ==, obj_num);
697fa9e4066Sahrens 	zfs_znode_dmu_init(zp);
698ea8dc4b6Seschrock 	ZFS_OBJ_HOLD_EXIT(zfsvfs, obj_num);
699fa9e4066Sahrens 	*zpp = zp;
700fa9e4066Sahrens 	return (0);
701fa9e4066Sahrens }
702fa9e4066Sahrens 
703fa9e4066Sahrens void
704fa9e4066Sahrens zfs_znode_delete(znode_t *zp, dmu_tx_t *tx)
705fa9e4066Sahrens {
706fa9e4066Sahrens 	zfsvfs_t *zfsvfs = zp->z_zfsvfs;
707fa9e4066Sahrens 	int error;
708fa9e4066Sahrens 
709fa9e4066Sahrens 	ZFS_OBJ_HOLD_ENTER(zfsvfs, zp->z_id);
710fa9e4066Sahrens 	if (zp->z_phys->zp_acl.z_acl_extern_obj) {
711fa9e4066Sahrens 		error = dmu_object_free(zfsvfs->z_os,
712fa9e4066Sahrens 		    zp->z_phys->zp_acl.z_acl_extern_obj, tx);
713fa9e4066Sahrens 		ASSERT3U(error, ==, 0);
714fa9e4066Sahrens 	}
715fa9e4066Sahrens 	error = dmu_object_free(zfsvfs->z_os, zp->z_id, tx);
716fa9e4066Sahrens 	ASSERT3U(error, ==, 0);
717fa9e4066Sahrens 	zp->z_dbuf_held = 0;
718fa9e4066Sahrens 	ZFS_OBJ_HOLD_EXIT(zfsvfs, zp->z_id);
719ea8dc4b6Seschrock 	dmu_buf_rele(zp->z_dbuf, NULL);
720fa9e4066Sahrens }
721fa9e4066Sahrens 
722fa9e4066Sahrens void
723fa9e4066Sahrens zfs_zinactive(znode_t *zp)
724fa9e4066Sahrens {
725fa9e4066Sahrens 	vnode_t	*vp = ZTOV(zp);
726fa9e4066Sahrens 	zfsvfs_t *zfsvfs = zp->z_zfsvfs;
727fa9e4066Sahrens 	uint64_t z_id = zp->z_id;
728fa9e4066Sahrens 
729fa9e4066Sahrens 	ASSERT(zp->z_dbuf_held && zp->z_phys);
730fa9e4066Sahrens 
731fa9e4066Sahrens 	/*
732fa9e4066Sahrens 	 * Don't allow a zfs_zget() while were trying to release this znode
733fa9e4066Sahrens 	 */
734fa9e4066Sahrens 	ZFS_OBJ_HOLD_ENTER(zfsvfs, z_id);
735fa9e4066Sahrens 
736fa9e4066Sahrens 	mutex_enter(&zp->z_lock);
737fa9e4066Sahrens 	mutex_enter(&vp->v_lock);
738fa9e4066Sahrens 	vp->v_count--;
739fa9e4066Sahrens 	if (vp->v_count > 0 || vn_has_cached_data(vp)) {
740fa9e4066Sahrens 		/*
741fa9e4066Sahrens 		 * If the hold count is greater than zero, somebody has
742fa9e4066Sahrens 		 * obtained a new reference on this znode while we were
743fa9e4066Sahrens 		 * processing it here, so we are done.  If we still have
744fa9e4066Sahrens 		 * mapped pages then we are also done, since we don't
745fa9e4066Sahrens 		 * want to inactivate the znode until the pages get pushed.
746fa9e4066Sahrens 		 *
747fa9e4066Sahrens 		 * XXX - if vn_has_cached_data(vp) is true, but count == 0,
748fa9e4066Sahrens 		 * this seems like it would leave the znode hanging with
749fa9e4066Sahrens 		 * no chance to go inactive...
750fa9e4066Sahrens 		 */
751fa9e4066Sahrens 		mutex_exit(&vp->v_lock);
752fa9e4066Sahrens 		mutex_exit(&zp->z_lock);
753fa9e4066Sahrens 		ZFS_OBJ_HOLD_EXIT(zfsvfs, z_id);
754fa9e4066Sahrens 		return;
755fa9e4066Sahrens 	}
756fa9e4066Sahrens 	mutex_exit(&vp->v_lock);
757fa9e4066Sahrens 
758fa9e4066Sahrens 	/*
759fa9e4066Sahrens 	 * If this was the last reference to a file with no links,
760fa9e4066Sahrens 	 * remove the file from the file system.
761fa9e4066Sahrens 	 */
762893a6d32Sahrens 	if (zp->z_unlinked) {
763fa9e4066Sahrens 		mutex_exit(&zp->z_lock);
764fa9e4066Sahrens 		ZFS_OBJ_HOLD_EXIT(zfsvfs, z_id);
765893a6d32Sahrens 		zfs_rmnode(zp);
766fa9e4066Sahrens 		VFS_RELE(zfsvfs->z_vfs);
767fa9e4066Sahrens 		return;
768fa9e4066Sahrens 	}
769ea8dc4b6Seschrock 	ASSERT(zp->z_phys);
770ea8dc4b6Seschrock 	ASSERT(zp->z_dbuf_held);
771fa9e4066Sahrens 
772ea8dc4b6Seschrock 	zp->z_dbuf_held = 0;
773fa9e4066Sahrens 	mutex_exit(&zp->z_lock);
774ea8dc4b6Seschrock 	dmu_buf_rele(zp->z_dbuf, NULL);
775fa9e4066Sahrens 	ZFS_OBJ_HOLD_EXIT(zfsvfs, z_id);
776ea8dc4b6Seschrock 	VFS_RELE(zfsvfs->z_vfs);
777fa9e4066Sahrens }
778fa9e4066Sahrens 
779fa9e4066Sahrens void
780fa9e4066Sahrens zfs_znode_free(znode_t *zp)
781fa9e4066Sahrens {
782fa9e4066Sahrens 	zfsvfs_t *zfsvfs = zp->z_zfsvfs;
783fa9e4066Sahrens 
784fa9e4066Sahrens 	mutex_enter(&zfsvfs->z_znodes_lock);
785fa9e4066Sahrens 	list_remove(&zfsvfs->z_all_znodes, zp);
786fa9e4066Sahrens 	mutex_exit(&zfsvfs->z_znodes_lock);
787fa9e4066Sahrens 
788fa9e4066Sahrens 	kmem_cache_free(znode_cache, zp);
789fa9e4066Sahrens }
790fa9e4066Sahrens 
791fa9e4066Sahrens void
792fa9e4066Sahrens zfs_time_stamper_locked(znode_t *zp, uint_t flag, dmu_tx_t *tx)
793fa9e4066Sahrens {
794fa9e4066Sahrens 	timestruc_t	now;
795fa9e4066Sahrens 
796fa9e4066Sahrens 	ASSERT(MUTEX_HELD(&zp->z_lock));
797fa9e4066Sahrens 
798fa9e4066Sahrens 	gethrestime(&now);
799fa9e4066Sahrens 
800fa9e4066Sahrens 	if (tx) {
801fa9e4066Sahrens 		dmu_buf_will_dirty(zp->z_dbuf, tx);
802fa9e4066Sahrens 		zp->z_atime_dirty = 0;
803fa9e4066Sahrens 		zp->z_seq++;
804fa9e4066Sahrens 	} else {
805fa9e4066Sahrens 		zp->z_atime_dirty = 1;
806fa9e4066Sahrens 	}
807fa9e4066Sahrens 
808fa9e4066Sahrens 	if (flag & AT_ATIME)
809fa9e4066Sahrens 		ZFS_TIME_ENCODE(&now, zp->z_phys->zp_atime);
810fa9e4066Sahrens 
811fa9e4066Sahrens 	if (flag & AT_MTIME)
812fa9e4066Sahrens 		ZFS_TIME_ENCODE(&now, zp->z_phys->zp_mtime);
813fa9e4066Sahrens 
814fa9e4066Sahrens 	if (flag & AT_CTIME)
815fa9e4066Sahrens 		ZFS_TIME_ENCODE(&now, zp->z_phys->zp_ctime);
816fa9e4066Sahrens }
817fa9e4066Sahrens 
818fa9e4066Sahrens /*
819fa9e4066Sahrens  * Update the requested znode timestamps with the current time.
820fa9e4066Sahrens  * If we are in a transaction, then go ahead and mark the znode
821fa9e4066Sahrens  * dirty in the transaction so the timestamps will go to disk.
822fa9e4066Sahrens  * Otherwise, we will get pushed next time the znode is updated
823fa9e4066Sahrens  * in a transaction, or when this znode eventually goes inactive.
824fa9e4066Sahrens  *
825fa9e4066Sahrens  * Why is this OK?
826fa9e4066Sahrens  *  1 - Only the ACCESS time is ever updated outside of a transaction.
827fa9e4066Sahrens  *  2 - Multiple consecutive updates will be collapsed into a single
828fa9e4066Sahrens  *	znode update by the transaction grouping semantics of the DMU.
829fa9e4066Sahrens  */
830fa9e4066Sahrens void
831fa9e4066Sahrens zfs_time_stamper(znode_t *zp, uint_t flag, dmu_tx_t *tx)
832fa9e4066Sahrens {
833fa9e4066Sahrens 	mutex_enter(&zp->z_lock);
834fa9e4066Sahrens 	zfs_time_stamper_locked(zp, flag, tx);
835fa9e4066Sahrens 	mutex_exit(&zp->z_lock);
836fa9e4066Sahrens }
837fa9e4066Sahrens 
838fa9e4066Sahrens /*
839104e2ed7Sperrin  * Grow the block size for a file.
840fa9e4066Sahrens  *
841fa9e4066Sahrens  *	IN:	zp	- znode of file to free data in.
842fa9e4066Sahrens  *		size	- requested block size
843fa9e4066Sahrens  *		tx	- open transaction.
844fa9e4066Sahrens  *
845fa9e4066Sahrens  * NOTE: this function assumes that the znode is write locked.
846fa9e4066Sahrens  */
847104e2ed7Sperrin void
848fa9e4066Sahrens zfs_grow_blocksize(znode_t *zp, uint64_t size, dmu_tx_t *tx)
849fa9e4066Sahrens {
850fa9e4066Sahrens 	int		error;
851fa9e4066Sahrens 	u_longlong_t	dummy;
852fa9e4066Sahrens 
853fa9e4066Sahrens 	if (size <= zp->z_blksz)
854104e2ed7Sperrin 		return;
855fa9e4066Sahrens 	/*
856fa9e4066Sahrens 	 * If the file size is already greater than the current blocksize,
857fa9e4066Sahrens 	 * we will not grow.  If there is more than one block in a file,
858fa9e4066Sahrens 	 * the blocksize cannot change.
859fa9e4066Sahrens 	 */
860fa9e4066Sahrens 	if (zp->z_blksz && zp->z_phys->zp_size > zp->z_blksz)
861104e2ed7Sperrin 		return;
862fa9e4066Sahrens 
863fa9e4066Sahrens 	error = dmu_object_set_blocksize(zp->z_zfsvfs->z_os, zp->z_id,
864fa9e4066Sahrens 	    size, 0, tx);
865fa9e4066Sahrens 	if (error == ENOTSUP)
866104e2ed7Sperrin 		return;
867fa9e4066Sahrens 	ASSERT3U(error, ==, 0);
868fa9e4066Sahrens 
869fa9e4066Sahrens 	/* What blocksize did we actually get? */
870fa9e4066Sahrens 	dmu_object_size_from_db(zp->z_dbuf, &zp->z_blksz, &dummy);
871fa9e4066Sahrens }
872fa9e4066Sahrens 
873fa9e4066Sahrens /*
874fa9e4066Sahrens  * This is a dummy interface used when pvn_vplist_dirty() should *not*
875fa9e4066Sahrens  * be calling back into the fs for a putpage().  E.g.: when truncating
876fa9e4066Sahrens  * a file, the pages being "thrown away* don't need to be written out.
877fa9e4066Sahrens  */
878fa9e4066Sahrens /* ARGSUSED */
879fa9e4066Sahrens static int
880fa9e4066Sahrens zfs_no_putpage(vnode_t *vp, page_t *pp, u_offset_t *offp, size_t *lenp,
881fa9e4066Sahrens     int flags, cred_t *cr)
882fa9e4066Sahrens {
883fa9e4066Sahrens 	ASSERT(0);
884fa9e4066Sahrens 	return (0);
885fa9e4066Sahrens }
886fa9e4066Sahrens 
887fa9e4066Sahrens /*
888104e2ed7Sperrin  * Free space in a file.
889fa9e4066Sahrens  *
890fa9e4066Sahrens  *	IN:	zp	- znode of file to free data in.
8915730cc9aSmaybee  *		off	- start of section to free.
892fa9e4066Sahrens  *		len	- length of section to free (0 => to EOF).
893fa9e4066Sahrens  *		flag	- current file open mode flags.
894fa9e4066Sahrens  *
895fa9e4066Sahrens  * 	RETURN:	0 if success
896fa9e4066Sahrens  *		error code if failure
897fa9e4066Sahrens  */
898fa9e4066Sahrens int
8995730cc9aSmaybee zfs_freesp(znode_t *zp, uint64_t off, uint64_t len, int flag, boolean_t log)
900fa9e4066Sahrens {
901fa9e4066Sahrens 	vnode_t *vp = ZTOV(zp);
9025730cc9aSmaybee 	dmu_tx_t *tx;
9035730cc9aSmaybee 	zfsvfs_t *zfsvfs = zp->z_zfsvfs;
9045730cc9aSmaybee 	zilog_t *zilog = zfsvfs->z_log;
9055730cc9aSmaybee 	rl_t *rl;
9065730cc9aSmaybee 	uint64_t end = off + len;
9075730cc9aSmaybee 	uint64_t size, new_blksz;
908104e2ed7Sperrin 	int error;
909fa9e4066Sahrens 
9108ef9dde0Smarks 	if (ZTOV(zp)->v_type == VFIFO)
9118ef9dde0Smarks 		return (0);
9128ef9dde0Smarks 
9135730cc9aSmaybee 	/*
9145730cc9aSmaybee 	 * If we will change zp_size then lock the whole file,
9155730cc9aSmaybee 	 * otherwise just lock the range being freed.
9165730cc9aSmaybee 	 */
9175730cc9aSmaybee 	if (len == 0 || off + len > zp->z_phys->zp_size) {
9185730cc9aSmaybee 		rl = zfs_range_lock(zp, 0, UINT64_MAX, RL_WRITER);
9195730cc9aSmaybee 	} else {
9205730cc9aSmaybee 		rl = zfs_range_lock(zp, off, len, RL_WRITER);
9215730cc9aSmaybee 		/* recheck, in case zp_size changed */
9225730cc9aSmaybee 		if (off + len > zp->z_phys->zp_size) {
9235730cc9aSmaybee 			/* lost race: file size changed, lock whole file */
924c5c6ffa0Smaybee 			zfs_range_unlock(rl);
9255730cc9aSmaybee 			rl = zfs_range_lock(zp, 0, UINT64_MAX, RL_WRITER);
9265730cc9aSmaybee 		}
9275730cc9aSmaybee 	}
9285730cc9aSmaybee 
929fa9e4066Sahrens 	/*
930fa9e4066Sahrens 	 * Nothing to do if file already at desired length.
931fa9e4066Sahrens 	 */
9325730cc9aSmaybee 	size = zp->z_phys->zp_size;
9335730cc9aSmaybee 	if (len == 0 && size == off) {
934c5c6ffa0Smaybee 		zfs_range_unlock(rl);
935fa9e4066Sahrens 		return (0);
936fa9e4066Sahrens 	}
937fa9e4066Sahrens 
938fa9e4066Sahrens 	/*
939fa9e4066Sahrens 	 * Check for any locks in the region to be freed.
940fa9e4066Sahrens 	 */
941fa9e4066Sahrens 	if (MANDLOCK(vp, (mode_t)zp->z_phys->zp_mode)) {
9425730cc9aSmaybee 		uint64_t start = off;
9435730cc9aSmaybee 		uint64_t extent = len;
944fa9e4066Sahrens 
9455730cc9aSmaybee 		if (off > size) {
946fa9e4066Sahrens 			start = size;
9475730cc9aSmaybee 			extent += off - size;
9485730cc9aSmaybee 		} else if (len == 0) {
9495730cc9aSmaybee 			extent = size - off;
9505730cc9aSmaybee 		}
9515730cc9aSmaybee 		if (error = chklock(vp, FWRITE, start, extent, flag, NULL)) {
952c5c6ffa0Smaybee 			zfs_range_unlock(rl);
953fa9e4066Sahrens 			return (error);
9545730cc9aSmaybee 		}
955fa9e4066Sahrens 	}
956fa9e4066Sahrens 
9575730cc9aSmaybee 	tx = dmu_tx_create(zfsvfs->z_os);
9585730cc9aSmaybee 	dmu_tx_hold_bonus(tx, zp->z_id);
9595730cc9aSmaybee 	new_blksz = 0;
9605730cc9aSmaybee 	if (end > size &&
9615730cc9aSmaybee 	    (!ISP2(zp->z_blksz) || zp->z_blksz < zfsvfs->z_max_blksz)) {
962fa9e4066Sahrens 		/*
963fa9e4066Sahrens 		 * We are growing the file past the current block size.
964fa9e4066Sahrens 		 */
965fa9e4066Sahrens 		if (zp->z_blksz > zp->z_zfsvfs->z_max_blksz) {
966fa9e4066Sahrens 			ASSERT(!ISP2(zp->z_blksz));
967fa9e4066Sahrens 			new_blksz = MIN(end, SPA_MAXBLOCKSIZE);
968fa9e4066Sahrens 		} else {
969fa9e4066Sahrens 			new_blksz = MIN(end, zp->z_zfsvfs->z_max_blksz);
970fa9e4066Sahrens 		}
9715730cc9aSmaybee 		dmu_tx_hold_write(tx, zp->z_id, 0, MIN(end, new_blksz));
9725730cc9aSmaybee 	} else if (off < size) {
9735730cc9aSmaybee 		/*
9745730cc9aSmaybee 		 * If len == 0, we are truncating the file.
9755730cc9aSmaybee 		 */
9765730cc9aSmaybee 		dmu_tx_hold_free(tx, zp->z_id, off, len ? len : DMU_OBJECT_END);
9775730cc9aSmaybee 	}
9785730cc9aSmaybee 
9795730cc9aSmaybee 	error = dmu_tx_assign(tx, zfsvfs->z_assign);
9805730cc9aSmaybee 	if (error) {
9818a2f1b91Sahrens 		if (error == ERESTART && zfsvfs->z_assign == TXG_NOWAIT)
9828a2f1b91Sahrens 			dmu_tx_wait(tx);
9835730cc9aSmaybee 		dmu_tx_abort(tx);
984c5c6ffa0Smaybee 		zfs_range_unlock(rl);
9855730cc9aSmaybee 		return (error);
986fa9e4066Sahrens 	}
9875730cc9aSmaybee 
9885730cc9aSmaybee 	if (new_blksz)
9895730cc9aSmaybee 		zfs_grow_blocksize(zp, new_blksz, tx);
9905730cc9aSmaybee 
991fa9e4066Sahrens 	if (end > size || len == 0)
992fa9e4066Sahrens 		zp->z_phys->zp_size = end;
9935730cc9aSmaybee 
9945730cc9aSmaybee 	if (off < size) {
9955730cc9aSmaybee 		objset_t *os = zfsvfs->z_os;
9965dc8af33Smaybee 		uint64_t rlen = len;
9975730cc9aSmaybee 
9985730cc9aSmaybee 		if (len == 0)
9995dc8af33Smaybee 			rlen = -1;
10005730cc9aSmaybee 		else if (end > size)
10015dc8af33Smaybee 			rlen = size - off;
10025dc8af33Smaybee 		VERIFY(0 == dmu_free_range(os, zp->z_id, off, rlen, tx));
10035730cc9aSmaybee 	}
10045730cc9aSmaybee 
10055730cc9aSmaybee 	if (log) {
10065730cc9aSmaybee 		zfs_time_stamper(zp, CONTENT_MODIFIED, tx);
1007b19a79ecSperrin 		zfs_log_truncate(zilog, tx, TX_TRUNCATE, zp, off, len);
10085730cc9aSmaybee 	}
10095730cc9aSmaybee 
1010c5c6ffa0Smaybee 	zfs_range_unlock(rl);
10115730cc9aSmaybee 
10125730cc9aSmaybee 	dmu_tx_commit(tx);
10135730cc9aSmaybee 
1014fa9e4066Sahrens 	/*
10155730cc9aSmaybee 	 * Clear any mapped pages in the truncated region.  This has to
10165730cc9aSmaybee 	 * happen outside of the transaction to avoid the possibility of
10175730cc9aSmaybee 	 * a deadlock with someone trying to push a page that we are
10185730cc9aSmaybee 	 * about to invalidate.
1019fa9e4066Sahrens 	 */
1020fa9e4066Sahrens 	rw_enter(&zp->z_map_lock, RW_WRITER);
10215730cc9aSmaybee 	if (off < size && vn_has_cached_data(vp)) {
1022fa9e4066Sahrens 		page_t *pp;
10235730cc9aSmaybee 		uint64_t start = off & PAGEMASK;
10245730cc9aSmaybee 		int poff = off & PAGEOFFSET;
1025fa9e4066Sahrens 
10265730cc9aSmaybee 		if (poff != 0 && (pp = page_lookup(vp, start, SE_SHARED))) {
1027fa9e4066Sahrens 			/*
1028fa9e4066Sahrens 			 * We need to zero a partial page.
1029fa9e4066Sahrens 			 */
10305730cc9aSmaybee 			pagezero(pp, poff, PAGESIZE - poff);
1031fa9e4066Sahrens 			start += PAGESIZE;
1032fa9e4066Sahrens 			page_unlock(pp);
1033fa9e4066Sahrens 		}
1034fa9e4066Sahrens 		error = pvn_vplist_dirty(vp, start, zfs_no_putpage,
10355730cc9aSmaybee 		    B_INVAL | B_TRUNC, NULL);
1036fa9e4066Sahrens 		ASSERT(error == 0);
1037fa9e4066Sahrens 	}
1038fa9e4066Sahrens 	rw_exit(&zp->z_map_lock);
1039fa9e4066Sahrens 
1040fa9e4066Sahrens 	return (0);
1041fa9e4066Sahrens }
1042fa9e4066Sahrens 
1043fa9e4066Sahrens void
1044fa9e4066Sahrens zfs_create_fs(objset_t *os, cred_t *cr, dmu_tx_t *tx)
1045fa9e4066Sahrens {
1046fa9e4066Sahrens 	zfsvfs_t	zfsvfs;
1047fa9e4066Sahrens 	uint64_t	moid, doid, roid = 0;
1048eaca9bbdSeschrock 	uint64_t	version = ZPL_VERSION;
1049fa9e4066Sahrens 	int		error;
1050fa9e4066Sahrens 	znode_t		*rootzp = NULL;
1051fa9e4066Sahrens 	vnode_t		*vp;
1052fa9e4066Sahrens 	vattr_t		vattr;
1053fa9e4066Sahrens 
1054fa9e4066Sahrens 	/*
1055fa9e4066Sahrens 	 * First attempt to create master node.
1056fa9e4066Sahrens 	 */
1057ea8dc4b6Seschrock 	/*
1058ea8dc4b6Seschrock 	 * In an empty objset, there are no blocks to read and thus
1059ea8dc4b6Seschrock 	 * there can be no i/o errors (which we assert below).
1060ea8dc4b6Seschrock 	 */
1061fa9e4066Sahrens 	moid = MASTER_NODE_OBJ;
1062fa9e4066Sahrens 	error = zap_create_claim(os, moid, DMU_OT_MASTER_NODE,
1063fa9e4066Sahrens 	    DMU_OT_NONE, 0, tx);
1064fa9e4066Sahrens 	ASSERT(error == 0);
1065fa9e4066Sahrens 
1066fa9e4066Sahrens 	/*
1067fa9e4066Sahrens 	 * Set starting attributes.
1068fa9e4066Sahrens 	 */
1069fa9e4066Sahrens 
1070eaca9bbdSeschrock 	error = zap_update(os, moid, ZPL_VERSION_OBJ, 8, 1, &version, tx);
1071fa9e4066Sahrens 	ASSERT(error == 0);
1072fa9e4066Sahrens 
1073fa9e4066Sahrens 	/*
1074fa9e4066Sahrens 	 * Create a delete queue.
1075fa9e4066Sahrens 	 */
1076893a6d32Sahrens 	doid = zap_create(os, DMU_OT_UNLINKED_SET, DMU_OT_NONE, 0, tx);
1077fa9e4066Sahrens 
1078893a6d32Sahrens 	error = zap_add(os, moid, ZFS_UNLINKED_SET, 8, 1, &doid, tx);
1079fa9e4066Sahrens 	ASSERT(error == 0);
1080fa9e4066Sahrens 
1081fa9e4066Sahrens 	/*
1082fa9e4066Sahrens 	 * Create root znode.  Create minimal znode/vnode/zfsvfs
1083fa9e4066Sahrens 	 * to allow zfs_mknode to work.
1084fa9e4066Sahrens 	 */
1085fa9e4066Sahrens 	vattr.va_mask = AT_MODE|AT_UID|AT_GID|AT_TYPE;
1086fa9e4066Sahrens 	vattr.va_type = VDIR;
1087fa9e4066Sahrens 	vattr.va_mode = S_IFDIR|0755;
1088fa9e4066Sahrens 	vattr.va_uid = 0;
1089fa9e4066Sahrens 	vattr.va_gid = 3;
1090fa9e4066Sahrens 
1091fa9e4066Sahrens 	rootzp = kmem_cache_alloc(znode_cache, KM_SLEEP);
1092fa9e4066Sahrens 	rootzp->z_zfsvfs = &zfsvfs;
1093893a6d32Sahrens 	rootzp->z_unlinked = 0;
1094fa9e4066Sahrens 	rootzp->z_atime_dirty = 0;
1095fa9e4066Sahrens 	rootzp->z_dbuf_held = 0;
1096fa9e4066Sahrens 
1097fa9e4066Sahrens 	vp = ZTOV(rootzp);
1098fa9e4066Sahrens 	vn_reinit(vp);
1099fa9e4066Sahrens 	vp->v_type = VDIR;
1100fa9e4066Sahrens 
1101fa9e4066Sahrens 	bzero(&zfsvfs, sizeof (zfsvfs_t));
1102fa9e4066Sahrens 
1103fa9e4066Sahrens 	zfsvfs.z_os = os;
1104fa9e4066Sahrens 	zfsvfs.z_assign = TXG_NOWAIT;
1105fa9e4066Sahrens 	zfsvfs.z_parent = &zfsvfs;
1106fa9e4066Sahrens 
1107fa9e4066Sahrens 	mutex_init(&zfsvfs.z_znodes_lock, NULL, MUTEX_DEFAULT, NULL);
1108fa9e4066Sahrens 	list_create(&zfsvfs.z_all_znodes, sizeof (znode_t),
1109fa9e4066Sahrens 	    offsetof(znode_t, z_link_node));
1110fa9e4066Sahrens 
1111fa9e4066Sahrens 	zfs_mknode(rootzp, &vattr, &roid, tx, cr, IS_ROOT_NODE, NULL, 0);
1112fa9e4066Sahrens 	ASSERT3U(rootzp->z_id, ==, roid);
1113fa9e4066Sahrens 	error = zap_add(os, moid, ZFS_ROOT_OBJ, 8, 1, &roid, tx);
1114fa9e4066Sahrens 	ASSERT(error == 0);
1115fa9e4066Sahrens 
1116fa9e4066Sahrens 	ZTOV(rootzp)->v_count = 0;
1117fa9e4066Sahrens 	kmem_cache_free(znode_cache, rootzp);
1118fa9e4066Sahrens }
111955434c77Sek #endif /* _KERNEL */
112055434c77Sek 
112155434c77Sek /*
112255434c77Sek  * Given an object number, return its parent object number and whether
112355434c77Sek  * or not the object is an extended attribute directory.
112455434c77Sek  */
112555434c77Sek static int
112655434c77Sek zfs_obj_to_pobj(objset_t *osp, uint64_t obj, uint64_t *pobjp, int *is_xattrdir)
112755434c77Sek {
112855434c77Sek 	dmu_buf_t *db;
112955434c77Sek 	dmu_object_info_t doi;
113055434c77Sek 	znode_phys_t *zp;
113155434c77Sek 	int error;
113255434c77Sek 
113355434c77Sek 	if ((error = dmu_bonus_hold(osp, obj, FTAG, &db)) != 0)
113455434c77Sek 		return (error);
113555434c77Sek 
113655434c77Sek 	dmu_object_info_from_db(db, &doi);
113755434c77Sek 	if (doi.doi_bonus_type != DMU_OT_ZNODE ||
113855434c77Sek 	    doi.doi_bonus_size < sizeof (znode_phys_t)) {
113955434c77Sek 		dmu_buf_rele(db, FTAG);
114055434c77Sek 		return (EINVAL);
114155434c77Sek 	}
114255434c77Sek 
114355434c77Sek 	zp = db->db_data;
114455434c77Sek 	*pobjp = zp->zp_parent;
114555434c77Sek 	*is_xattrdir = ((zp->zp_flags & ZFS_XATTR) != 0) &&
114655434c77Sek 	    S_ISDIR(zp->zp_mode);
114755434c77Sek 	dmu_buf_rele(db, FTAG);
114855434c77Sek 
114955434c77Sek 	return (0);
115055434c77Sek }
115155434c77Sek 
115255434c77Sek int
115355434c77Sek zfs_obj_to_path(objset_t *osp, uint64_t obj, char *buf, int len)
115455434c77Sek {
115555434c77Sek 	char *path = buf + len - 1;
115655434c77Sek 	int error;
115755434c77Sek 
115855434c77Sek 	*path = '\0';
115955434c77Sek 
116055434c77Sek 	for (;;) {
116155434c77Sek 		uint64_t pobj;
116255434c77Sek 		char component[MAXNAMELEN + 2];
116355434c77Sek 		size_t complen;
116455434c77Sek 		int is_xattrdir;
116555434c77Sek 
116655434c77Sek 		if ((error = zfs_obj_to_pobj(osp, obj, &pobj,
116755434c77Sek 		    &is_xattrdir)) != 0)
116855434c77Sek 			break;
116955434c77Sek 
117055434c77Sek 		if (pobj == obj) {
117155434c77Sek 			if (path[0] != '/')
117255434c77Sek 				*--path = '/';
117355434c77Sek 			break;
117455434c77Sek 		}
117555434c77Sek 
117655434c77Sek 		component[0] = '/';
117755434c77Sek 		if (is_xattrdir) {
117855434c77Sek 			(void) sprintf(component + 1, "<xattrdir>");
117955434c77Sek 		} else {
118055434c77Sek 			error = zap_value_search(osp, pobj, obj, component + 1);
118155434c77Sek 			if (error != 0)
118255434c77Sek 				break;
118355434c77Sek 		}
118455434c77Sek 
118555434c77Sek 		complen = strlen(component);
118655434c77Sek 		path -= complen;
118755434c77Sek 		ASSERT(path >= buf);
118855434c77Sek 		bcopy(component, path, complen);
118955434c77Sek 		obj = pobj;
119055434c77Sek 	}
119155434c77Sek 
119255434c77Sek 	if (error == 0)
119355434c77Sek 		(void) memmove(buf, path, buf + len - path);
119455434c77Sek 	return (error);
119555434c77Sek }
1196