inode.c

  1/*
  2 * Copyright (c) 2002 Red Hat, Inc. All rights reserved.
  3 *
  4 * This software may be freely redistributed under the terms of the
  5 * GNU General Public License.
  6 *
  7 * You should have received a copy of the GNU General Public License
  8 * along with this program; if not, write to the Free Software
  9 * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 10 *
 11 * Authors: David Woodhouse <dwmw2@infradead.org>
 12 *          David Howells <dhowells@redhat.com>
 13 *
 14 */
 15
 16#include <linux/kernel.h>
 17#include <linux/module.h>
 18#include <linux/init.h>
 19#include <linux/fs.h>
 20#include <linux/pagemap.h>
 21#include <linux/sched.h>
 22#include <linux/mount.h>
 23#include <linux/namei.h>
 24#include <linux/iversion.h>
 25#include "internal.h"
 26#include "afs_fs.h"
 27
 28void afs_init_new_symlink(struct afs_vnode *vnode, struct afs_operation *op)
 29{
 30	size_t size = strlen(op->create.symlink) + 1;
 31	size_t dsize = 0;
 32	char *p;
 33
 34	if (netfs_alloc_folioq_buffer(NULL, &vnode->directory, &dsize, size,
 35				      mapping_gfp_mask(vnode->netfs.inode.i_mapping)) < 0)
 36		return;
 37
 38	vnode->directory_size = dsize;
 39	p = kmap_local_folio(folioq_folio(vnode->directory, 0), 0);
 40	memcpy(p, op->create.symlink, size);
 41	kunmap_local(p);
 42	set_bit(AFS_VNODE_DIR_READ, &vnode->flags);
 43	netfs_single_mark_inode_dirty(&vnode->netfs.inode);
 44}
 45
 46static void afs_put_link(void *arg)
 47{
 48	struct folio *folio = virt_to_folio(arg);
 49
 50	kunmap_local(arg);
 51	folio_put(folio);
 52}
 53
 54const char *afs_get_link(struct dentry *dentry, struct inode *inode,
 55			 struct delayed_call *callback)
 56{
 57	struct afs_vnode *vnode = AFS_FS_I(inode);
 58	struct folio *folio;
 59	char *content;
 60	ssize_t ret;
 61
 62	if (!dentry) {
 63		/* RCU pathwalk. */
 64		if (!test_bit(AFS_VNODE_DIR_READ, &vnode->flags) || !afs_check_validity(vnode))
 65			return ERR_PTR(-ECHILD);
 66		goto good;
 67	}
 68
 69	if (test_bit(AFS_VNODE_DIR_READ, &vnode->flags))
 70		goto fetch;
 71
 72	ret = afs_validate(vnode, NULL);
 73	if (ret < 0)
 74		return ERR_PTR(ret);
 75
 76	if (!test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags) &&
 77	    test_bit(AFS_VNODE_DIR_READ, &vnode->flags))
 78		goto good;
 79
 80fetch:
 81	ret = afs_read_single(vnode, NULL);
 82	if (ret < 0)
 83		return ERR_PTR(ret);
 84	set_bit(AFS_VNODE_DIR_READ, &vnode->flags);
 85
 86good:
 87	folio = folioq_folio(vnode->directory, 0);
 88	folio_get(folio);
 89	content = kmap_local_folio(folio, 0);
 90	set_delayed_call(callback, afs_put_link, content);
 91	return content;
 92}
 93
 94int afs_readlink(struct dentry *dentry, char __user *buffer, int buflen)
 95{
 96	DEFINE_DELAYED_CALL(done);
 97	const char *content;
 98	int len;
 99
100	content = afs_get_link(dentry, d_inode(dentry), &done);
101	if (IS_ERR(content)) {
102		do_delayed_call(&done);
103		return PTR_ERR(content);
104	}
105
106	len = umin(strlen(content), buflen);
107	if (copy_to_user(buffer, content, len))
108		len = -EFAULT;
109	do_delayed_call(&done);
110	return len;
111}
112
113static const struct inode_operations afs_symlink_inode_operations = {
114	.get_link	= afs_get_link,
115	.readlink	= afs_readlink,
116};
117
118static noinline void dump_vnode(struct afs_vnode *vnode, struct afs_vnode *parent_vnode)
119{
120	static unsigned long once_only;
121
122	pr_warn("kAFS: AFS vnode with undefined type %u\n", vnode->status.type);
123	pr_warn("kAFS: A=%d m=%o s=%llx v=%llx\n",
124		vnode->status.abort_code,
125		vnode->status.mode,
126		vnode->status.size,
127		vnode->status.data_version);
128	pr_warn("kAFS: vnode %llx:%llx:%x\n",
129		vnode->fid.vid,
130		vnode->fid.vnode,
131		vnode->fid.unique);
132	if (parent_vnode)
133		pr_warn("kAFS: dir %llx:%llx:%x\n",
134			parent_vnode->fid.vid,
135			parent_vnode->fid.vnode,
136			parent_vnode->fid.unique);
137
138	if (!test_and_set_bit(0, &once_only))
139		dump_stack();
140}
141
142/*
143 * Set parameters for the netfs library
144 */
145static void afs_set_netfs_context(struct afs_vnode *vnode)
146{
147	netfs_inode_init(&vnode->netfs, &afs_req_ops, true);
148}
149
150/*
151 * Initialise an inode from the vnode status.
152 */
153static int afs_inode_init_from_status(struct afs_operation *op,
154				      struct afs_vnode_param *vp,
155				      struct afs_vnode *vnode)
156{
157	struct afs_file_status *status = &vp->scb.status;
158	struct inode *inode = AFS_VNODE_TO_I(vnode);
159	struct timespec64 t;
160
161	_enter("{%llx:%llu.%u} %s",
162	       vp->fid.vid, vp->fid.vnode, vp->fid.unique,
163	       op->type ? op->type->name : "???");
164
165	_debug("FS: ft=%d lk=%d sz=%llu ver=%Lu mod=%hu",
166	       status->type,
167	       status->nlink,
168	       (unsigned long long) status->size,
169	       status->data_version,
170	       status->mode);
171
172	write_seqlock(&vnode->cb_lock);
173
174	vnode->cb_v_check = op->cb_v_break;
175	vnode->status = *status;
176
177	t = status->mtime_client;
178	inode_set_ctime_to_ts(inode, t);
179	inode_set_mtime_to_ts(inode, t);
180	inode_set_atime_to_ts(inode, t);
181	inode->i_flags |= S_NOATIME;
182	inode->i_uid = make_kuid(&init_user_ns, status->owner);
183	inode->i_gid = make_kgid(&init_user_ns, status->group);
184	set_nlink(&vnode->netfs.inode, status->nlink);
185
186	switch (status->type) {
187	case AFS_FTYPE_FILE:
188		inode->i_mode	= S_IFREG | (status->mode & S_IALLUGO);
189		inode->i_op	= &afs_file_inode_operations;
190		inode->i_fop	= &afs_file_operations;
191		inode->i_mapping->a_ops	= &afs_file_aops;
192		mapping_set_large_folios(inode->i_mapping);
193		break;
194	case AFS_FTYPE_DIR:
195		inode->i_mode	= S_IFDIR |  (status->mode & S_IALLUGO);
196		inode->i_op	= &afs_dir_inode_operations;
197		inode->i_fop	= &afs_dir_file_operations;
198		inode->i_mapping->a_ops	= &afs_dir_aops;
199		__set_bit(NETFS_ICTX_SINGLE_NO_UPLOAD, &vnode->netfs.flags);
200		/* Assume locally cached directory data will be valid. */
201		__set_bit(AFS_VNODE_DIR_VALID, &vnode->flags);
202		break;
203	case AFS_FTYPE_SYMLINK:
204		/* Symlinks with a mode of 0644 are actually mountpoints. */
205		if ((status->mode & 0777) == 0644) {
206			inode->i_flags |= S_AUTOMOUNT;
207
208			set_bit(AFS_VNODE_MOUNTPOINT, &vnode->flags);
209
210			inode->i_mode	= S_IFDIR | 0555;
211			inode->i_op	= &afs_mntpt_inode_operations;
212			inode->i_fop	= &afs_mntpt_file_operations;
213		} else {
214			inode->i_mode	= S_IFLNK | status->mode;
215			inode->i_op	= &afs_symlink_inode_operations;
216		}
217		inode->i_mapping->a_ops	= &afs_dir_aops;
218		inode_nohighmem(inode);
219		mapping_set_release_always(inode->i_mapping);
220		break;
221	default:
222		dump_vnode(vnode, op->file[0].vnode != vnode ? op->file[0].vnode : NULL);
223		write_sequnlock(&vnode->cb_lock);
224		return afs_protocol_error(NULL, afs_eproto_file_type);
225	}
226
227	afs_set_i_size(vnode, status->size);
228	afs_set_netfs_context(vnode);
229
230	vnode->invalid_before	= status->data_version;
231	trace_afs_set_dv(vnode, status->data_version);
232	inode_set_iversion_raw(&vnode->netfs.inode, status->data_version);
233
234	if (!vp->scb.have_cb) {
235		/* it's a symlink we just created (the fileserver
236		 * didn't give us a callback) */
237		afs_clear_cb_promise(vnode, afs_cb_promise_set_new_symlink);
238	} else {
239		vnode->cb_server = op->server;
240		afs_set_cb_promise(vnode, vp->scb.callback.expires_at,
241				   afs_cb_promise_set_new_inode);
242	}
243
244	write_sequnlock(&vnode->cb_lock);
245	return 0;
246}
247
248/*
249 * Update the core inode struct from a returned status record.
250 */
251static void afs_apply_status(struct afs_operation *op,
252			     struct afs_vnode_param *vp)
253{
254	struct afs_file_status *status = &vp->scb.status;
255	struct afs_vnode *vnode = vp->vnode;
256	struct inode *inode = &vnode->netfs.inode;
257	struct timespec64 t;
258	umode_t mode;
259	bool unexpected_jump = false;
260	bool data_changed = false;
261	bool change_size = vp->set_size;
262
263	_enter("{%llx:%llu.%u} %s",
264	       vp->fid.vid, vp->fid.vnode, vp->fid.unique,
265	       op->type ? op->type->name : "???");
266
267	BUG_ON(test_bit(AFS_VNODE_UNSET, &vnode->flags));
268
269	if (status->type != vnode->status.type) {
270		pr_warn("Vnode %llx:%llx:%x changed type %u to %u\n",
271			vnode->fid.vid,
272			vnode->fid.vnode,
273			vnode->fid.unique,
274			status->type, vnode->status.type);
275		afs_protocol_error(NULL, afs_eproto_bad_status);
276		return;
277	}
278
279	if (status->nlink != vnode->status.nlink)
280		set_nlink(inode, status->nlink);
281
282	if (status->owner != vnode->status.owner)
283		inode->i_uid = make_kuid(&init_user_ns, status->owner);
284
285	if (status->group != vnode->status.group)
286		inode->i_gid = make_kgid(&init_user_ns, status->group);
287
288	if (status->mode != vnode->status.mode) {
289		mode = inode->i_mode;
290		mode &= ~S_IALLUGO;
291		mode |= status->mode & S_IALLUGO;
292		WRITE_ONCE(inode->i_mode, mode);
293	}
294
295	t = status->mtime_client;
296	inode_set_mtime_to_ts(inode, t);
297	if (vp->update_ctime)
298		inode_set_ctime_to_ts(inode, op->ctime);
299
300	if (vnode->status.data_version != status->data_version) {
301		trace_afs_set_dv(vnode, status->data_version);
302		data_changed = true;
303	}
304
305	vnode->status = *status;
306
307	if (vp->dv_before + vp->dv_delta != status->data_version) {
308		trace_afs_dv_mismatch(vnode, vp->dv_before, vp->dv_delta,
309				      status->data_version);
310
311		if (vnode->cb_ro_snapshot == atomic_read(&vnode->volume->cb_ro_snapshot) &&
312		    atomic64_read(&vnode->cb_expires_at) != AFS_NO_CB_PROMISE)
313			pr_warn("kAFS: vnode modified {%llx:%llu} %llx->%llx %s (op=%x)\n",
314				vnode->fid.vid, vnode->fid.vnode,
315				(unsigned long long)vp->dv_before + vp->dv_delta,
316				(unsigned long long)status->data_version,
317				op->type ? op->type->name : "???",
318				op->debug_id);
319
320		vnode->invalid_before = status->data_version;
321		if (vnode->status.type == AFS_FTYPE_DIR)
322			afs_invalidate_dir(vnode, afs_dir_invalid_dv_mismatch);
323		else
324			set_bit(AFS_VNODE_ZAP_DATA, &vnode->flags);
325		change_size = true;
326		data_changed = true;
327		unexpected_jump = true;
328	} else if (vnode->status.type == AFS_FTYPE_DIR) {
329		/* Expected directory change is handled elsewhere so
330		 * that we can locally edit the directory and save on a
331		 * download.
332		 */
333		if (test_bit(AFS_VNODE_DIR_VALID, &vnode->flags))
334			data_changed = false;
335		change_size = true;
336	}
337
338	if (data_changed) {
339		inode_set_iversion_raw(inode, status->data_version);
340
341		/* Only update the size if the data version jumped.  If the
342		 * file is being modified locally, then we might have our own
343		 * idea of what the size should be that's not the same as
344		 * what's on the server.
345		 */
346		vnode->netfs.remote_i_size = status->size;
347		if (change_size || status->size > i_size_read(inode)) {
348			afs_set_i_size(vnode, status->size);
349			if (unexpected_jump)
350				vnode->netfs.zero_point = status->size;
351			inode_set_ctime_to_ts(inode, t);
352			inode_set_atime_to_ts(inode, t);
353		}
354		if (op->ops == &afs_fetch_data_operation)
355			op->fetch.subreq->rreq->i_size = status->size;
356	}
357}
358
359/*
360 * Apply a callback to a vnode.
361 */
362static void afs_apply_callback(struct afs_operation *op,
363			       struct afs_vnode_param *vp)
364{
365	struct afs_callback *cb = &vp->scb.callback;
366	struct afs_vnode *vnode = vp->vnode;
367
368	if (!afs_cb_is_broken(vp->cb_break_before, vnode)) {
369		if (op->volume->type == AFSVL_RWVOL)
370			vnode->cb_server = op->server;
371		afs_set_cb_promise(vnode, cb->expires_at, afs_cb_promise_set_apply_cb);
372	}
373}
374
375/*
376 * Apply the received status and callback to an inode all in the same critical
377 * section to avoid races with afs_validate().
378 */
379void afs_vnode_commit_status(struct afs_operation *op, struct afs_vnode_param *vp)
380{
381	struct afs_vnode *vnode = vp->vnode;
382
383	_enter("");
384
385	write_seqlock(&vnode->cb_lock);
386
387	if (vp->scb.have_error) {
388		/* A YFS server will return this from RemoveFile2 and AFS and
389		 * YFS will return this from InlineBulkStatus.
390		 */
391		if (vp->scb.status.abort_code == VNOVNODE) {
392			set_bit(AFS_VNODE_DELETED, &vnode->flags);
393			clear_nlink(&vnode->netfs.inode);
394			__afs_break_callback(vnode, afs_cb_break_for_deleted);
395			op->flags &= ~AFS_OPERATION_DIR_CONFLICT;
396		}
397	} else if (vp->scb.have_status) {
398		if (vp->speculative &&
399		    (test_bit(AFS_VNODE_MODIFYING, &vnode->flags) ||
400		     vp->dv_before != vnode->status.data_version))
401			/* Ignore the result of a speculative bulk status fetch
402			 * if it splits around a modification op, thereby
403			 * appearing to regress the data version.
404			 */
405			goto out;
406		afs_apply_status(op, vp);
407		if (vp->scb.have_cb)
408			afs_apply_callback(op, vp);
409	} else if (vp->op_unlinked && !(op->flags & AFS_OPERATION_DIR_CONFLICT)) {
410		drop_nlink(&vnode->netfs.inode);
411		if (vnode->netfs.inode.i_nlink == 0) {
412			set_bit(AFS_VNODE_DELETED, &vnode->flags);
413			__afs_break_callback(vnode, afs_cb_break_for_deleted);
414		}
415	}
416
417out:
418	write_sequnlock(&vnode->cb_lock);
419
420	if (vp->scb.have_status)
421		afs_cache_permit(vnode, op->key, vp->cb_break_before, &vp->scb);
422}
423
424static void afs_fetch_status_success(struct afs_operation *op)
425{
426	struct afs_vnode_param *vp = &op->file[op->fetch_status.which];
427	struct afs_vnode *vnode = vp->vnode;
428	int ret;
429
430	if (inode_state_read_once(&vnode->netfs.inode) & I_NEW) {
431		ret = afs_inode_init_from_status(op, vp, vnode);
432		afs_op_set_error(op, ret);
433		if (ret == 0)
434			afs_cache_permit(vnode, op->key, vp->cb_break_before, &vp->scb);
435	} else {
436		afs_vnode_commit_status(op, vp);
437	}
438}
439
440const struct afs_operation_ops afs_fetch_status_operation = {
441	.issue_afs_rpc	= afs_fs_fetch_status,
442	.issue_yfs_rpc	= yfs_fs_fetch_status,
443	.success	= afs_fetch_status_success,
444	.aborted	= afs_check_for_remote_deletion,
445};
446
447/*
448 * Fetch file status from the volume.
449 */
450int afs_fetch_status(struct afs_vnode *vnode, struct key *key, bool is_new,
451		     afs_access_t *_caller_access)
452{
453	struct afs_operation *op;
454
455	_enter("%s,{%llx:%llu.%u,S=%lx}",
456	       vnode->volume->name,
457	       vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique,
458	       vnode->flags);
459
460	op = afs_alloc_operation(key, vnode->volume);
461	if (IS_ERR(op))
462		return PTR_ERR(op);
463
464	afs_op_set_vnode(op, 0, vnode);
465
466	op->nr_files	= 1;
467	op->ops		= &afs_fetch_status_operation;
468	afs_begin_vnode_operation(op);
469	afs_wait_for_operation(op);
470
471	if (_caller_access)
472		*_caller_access = op->file[0].scb.status.caller_access;
473	return afs_put_operation(op);
474}
475
476/*
477 * ilookup() comparator
478 */
479int afs_ilookup5_test_by_fid(struct inode *inode, void *opaque)
480{
481	struct afs_vnode *vnode = AFS_FS_I(inode);
482	struct afs_fid *fid = opaque;
483
484	return (fid->vnode == vnode->fid.vnode &&
485		fid->vnode_hi == vnode->fid.vnode_hi &&
486		fid->unique == vnode->fid.unique);
487}
488
489/*
490 * iget5() comparator
491 */
492static int afs_iget5_test(struct inode *inode, void *opaque)
493{
494	struct afs_vnode_param *vp = opaque;
495	//struct afs_vnode *vnode = AFS_FS_I(inode);
496
497	return afs_ilookup5_test_by_fid(inode, &vp->fid);
498}
499
500/*
501 * iget5() inode initialiser
502 */
503static int afs_iget5_set(struct inode *inode, void *opaque)
504{
505	struct afs_vnode_param *vp = opaque;
506	struct afs_super_info *as = AFS_FS_S(inode->i_sb);
507	struct afs_vnode *vnode = AFS_FS_I(inode);
508
509	vnode->volume		= as->volume;
510	vnode->fid		= vp->fid;
511
512	/* YFS supports 96-bit vnode IDs, but Linux only supports
513	 * 64-bit inode numbers.
514	 */
515	inode->i_ino		= vnode->fid.vnode;
516	inode->i_generation	= vnode->fid.unique;
517	return 0;
518}
519
520/*
521 * Get a cache cookie for an inode.
522 */
523static void afs_get_inode_cache(struct afs_vnode *vnode)
524{
525#ifdef CONFIG_AFS_FSCACHE
526	struct {
527		__be32 vnode_id;
528		__be32 unique;
529		__be32 vnode_id_ext[2];	/* Allow for a 96-bit key */
530	} __packed key;
531	struct afs_vnode_cache_aux aux;
532
533	if (vnode->status.type != AFS_FTYPE_FILE &&
534	    vnode->status.type != AFS_FTYPE_DIR &&
535	    vnode->status.type != AFS_FTYPE_SYMLINK) {
536		vnode->netfs.cache = NULL;
537		return;
538	}
539
540	key.vnode_id		= htonl(vnode->fid.vnode);
541	key.unique		= htonl(vnode->fid.unique);
542	key.vnode_id_ext[0]	= htonl(vnode->fid.vnode >> 32);
543	key.vnode_id_ext[1]	= htonl(vnode->fid.vnode_hi);
544	afs_set_cache_aux(vnode, &aux);
545
546	afs_vnode_set_cache(vnode,
547			    fscache_acquire_cookie(
548				    vnode->volume->cache,
549				    vnode->status.type == AFS_FTYPE_FILE ?
550				    0 : FSCACHE_ADV_SINGLE_CHUNK,
551				    &key, sizeof(key),
552				    &aux, sizeof(aux),
553				    i_size_read(&vnode->netfs.inode)));
554#endif
555}
556
557/*
558 * inode retrieval
559 */
560struct inode *afs_iget(struct afs_operation *op, struct afs_vnode_param *vp)
561{
562	struct afs_vnode_param *dvp = &op->file[0];
563	struct super_block *sb = dvp->vnode->netfs.inode.i_sb;
564	struct afs_vnode *vnode;
565	struct inode *inode;
566	int ret;
567
568	_enter(",{%llx:%llu.%u},,", vp->fid.vid, vp->fid.vnode, vp->fid.unique);
569
570	inode = iget5_locked(sb, vp->fid.vnode, afs_iget5_test, afs_iget5_set, vp);
571	if (!inode) {
572		_leave(" = -ENOMEM");
573		return ERR_PTR(-ENOMEM);
574	}
575
576	vnode = AFS_FS_I(inode);
577
578	_debug("GOT INODE %p { vl=%llx vn=%llx, u=%x }",
579	       inode, vnode->fid.vid, vnode->fid.vnode, vnode->fid.unique);
580
581	/* deal with an existing inode */
582	if (!(inode_state_read_once(inode) & I_NEW)) {
583		_leave(" = %p", inode);
584		return inode;
585	}
586
587	ret = afs_inode_init_from_status(op, vp, vnode);
588	if (ret < 0)
589		goto bad_inode;
590
591	afs_get_inode_cache(vnode);
592
593	/* success */
594	clear_bit(AFS_VNODE_UNSET, &vnode->flags);
595	unlock_new_inode(inode);
596	_leave(" = %p", inode);
597	return inode;
598
599	/* failure */
600bad_inode:
601	iget_failed(inode);
602	_leave(" = %d [bad]", ret);
603	return ERR_PTR(ret);
604}
605
606static int afs_iget5_set_root(struct inode *inode, void *opaque)
607{
608	struct afs_super_info *as = AFS_FS_S(inode->i_sb);
609	struct afs_vnode *vnode = AFS_FS_I(inode);
610
611	vnode->volume		= as->volume;
612	vnode->fid.vid		= as->volume->vid;
613	vnode->fid.vnode	= 1;
614	vnode->fid.unique	= 1;
615	inode->i_ino		= 1;
616	inode->i_generation	= 1;
617	return 0;
618}
619
620/*
621 * Set up the root inode for a volume.  This is always vnode 1, unique 1 within
622 * the volume.
623 */
624struct inode *afs_root_iget(struct super_block *sb, struct key *key)
625{
626	struct afs_super_info *as = AFS_FS_S(sb);
627	struct afs_operation *op;
628	struct afs_vnode *vnode;
629	struct inode *inode;
630	int ret;
631
632	_enter(",{%llx},,", as->volume->vid);
633
634	inode = iget5_locked(sb, 1, NULL, afs_iget5_set_root, NULL);
635	if (!inode) {
636		_leave(" = -ENOMEM");
637		return ERR_PTR(-ENOMEM);
638	}
639
640	_debug("GOT ROOT INODE %p { vl=%llx }", inode, as->volume->vid);
641
642	BUG_ON(!(inode_state_read_once(inode) & I_NEW));
643
644	vnode = AFS_FS_I(inode);
645	vnode->cb_v_check = atomic_read(&as->volume->cb_v_break);
646	afs_set_netfs_context(vnode);
647
648	op = afs_alloc_operation(key, as->volume);
649	if (IS_ERR(op)) {
650		ret = PTR_ERR(op);
651		goto error;
652	}
653
654	afs_op_set_vnode(op, 0, vnode);
655
656	op->nr_files	= 1;
657	op->ops		= &afs_fetch_status_operation;
658	ret = afs_do_sync_operation(op);
659	if (ret < 0)
660		goto error;
661
662	afs_get_inode_cache(vnode);
663
664	clear_bit(AFS_VNODE_UNSET, &vnode->flags);
665	unlock_new_inode(inode);
666	_leave(" = %p", inode);
667	return inode;
668
669error:
670	iget_failed(inode);
671	_leave(" = %d [bad]", ret);
672	return ERR_PTR(ret);
673}
674
675/*
676 * read the attributes of an inode
677 */
678int afs_getattr(struct mnt_idmap *idmap, const struct path *path,
679		struct kstat *stat, u32 request_mask, unsigned int query_flags)
680{
681	struct inode *inode = d_inode(path->dentry);
682	struct afs_vnode *vnode = AFS_FS_I(inode);
683	struct key *key;
684	int ret, seq;
685
686	_enter("{ ino=%lu v=%u }", inode->i_ino, inode->i_generation);
687
688	if (vnode->volume &&
689	    !(query_flags & AT_STATX_DONT_SYNC) &&
690	    atomic64_read(&vnode->cb_expires_at) == AFS_NO_CB_PROMISE) {
691		key = afs_request_key(vnode->volume->cell);
692		if (IS_ERR(key))
693			return PTR_ERR(key);
694		ret = afs_validate(vnode, key);
695		key_put(key);
696		if (ret < 0)
697			return ret;
698	}
699
700	do {
701		seq = read_seqbegin(&vnode->cb_lock);
702		generic_fillattr(&nop_mnt_idmap, request_mask, inode, stat);
703		if (test_bit(AFS_VNODE_SILLY_DELETED, &vnode->flags) &&
704		    stat->nlink > 0)
705			stat->nlink -= 1;
706
707		/* Lie about the size of directories.  We maintain a locally
708		 * edited copy and may make different allocation decisions on
709		 * it, but we need to give userspace the server's size.
710		 */
711		if (S_ISDIR(inode->i_mode))
712			stat->size = vnode->netfs.remote_i_size;
713	} while (read_seqretry(&vnode->cb_lock, seq));
714
715	return 0;
716}
717
718/*
719 * discard an AFS inode
720 */
721int afs_drop_inode(struct inode *inode)
722{
723	_enter("");
724
725	if (test_bit(AFS_VNODE_PSEUDODIR, &AFS_FS_I(inode)->flags))
726		return inode_just_drop(inode);
727	else
728		return inode_generic_drop(inode);
729}
730
731/*
732 * clear an AFS inode
733 */
734void afs_evict_inode(struct inode *inode)
735{
736	struct afs_vnode_cache_aux aux;
737	struct afs_super_info *sbi = AFS_FS_S(inode->i_sb);
738	struct afs_vnode *vnode = AFS_FS_I(inode);
739
740	_enter("{%llx:%llu.%d}",
741	       vnode->fid.vid,
742	       vnode->fid.vnode,
743	       vnode->fid.unique);
744
745	_debug("CLEAR INODE %p", inode);
746
747	ASSERTCMP(inode->i_ino, ==, vnode->fid.vnode);
748
749	if ((S_ISDIR(inode->i_mode) ||
750	     S_ISLNK(inode->i_mode)) &&
751	    (inode_state_read_once(inode) & I_DIRTY) &&
752	    !sbi->dyn_root) {
753		struct writeback_control wbc = {
754			.sync_mode = WB_SYNC_ALL,
755			.for_sync = true,
756			.range_end = LLONG_MAX,
757		};
758
759		afs_single_writepages(inode->i_mapping, &wbc);
760	}
761
762	netfs_wait_for_outstanding_io(inode);
763	truncate_inode_pages_final(&inode->i_data);
764	netfs_free_folioq_buffer(vnode->directory);
765
766	afs_set_cache_aux(vnode, &aux);
767	netfs_clear_inode_writeback(inode, &aux);
768	clear_inode(inode);
769
770	while (!list_empty(&vnode->wb_keys)) {
771		struct afs_wb_key *wbk = list_entry(vnode->wb_keys.next,
772						    struct afs_wb_key, vnode_link);
773		list_del(&wbk->vnode_link);
774		afs_put_wb_key(wbk);
775	}
776
777	fscache_relinquish_cookie(afs_vnode_cache(vnode),
778				  test_bit(AFS_VNODE_DELETED, &vnode->flags));
779
780	afs_prune_wb_keys(vnode);
781	afs_put_permits(rcu_access_pointer(vnode->permit_cache));
782	key_put(vnode->silly_key);
783	vnode->silly_key = NULL;
784	key_put(vnode->lock_key);
785	vnode->lock_key = NULL;
786	_leave("");
787}
788
789static void afs_setattr_success(struct afs_operation *op)
790{
791	struct afs_vnode_param *vp = &op->file[0];
792	struct inode *inode = &vp->vnode->netfs.inode;
793	loff_t old_i_size = i_size_read(inode);
794
795	op->setattr.old_i_size = old_i_size;
796	afs_vnode_commit_status(op, vp);
797	/* inode->i_size has now been changed. */
798
799	if (op->setattr.attr->ia_valid & ATTR_SIZE) {
800		loff_t size = op->setattr.attr->ia_size;
801		if (size > old_i_size)
802			pagecache_isize_extended(inode, old_i_size, size);
803	}
804}
805
806static void afs_setattr_edit_file(struct afs_operation *op)
807{
808	struct afs_vnode_param *vp = &op->file[0];
809	struct afs_vnode *vnode = vp->vnode;
810	struct inode *inode = &vnode->netfs.inode;
811
812	if (op->setattr.attr->ia_valid & ATTR_SIZE) {
813		loff_t size = op->setattr.attr->ia_size;
814		loff_t old = op->setattr.old_i_size;
815
816		/* Note: inode->i_size was updated by afs_apply_status() inside
817		 * the I/O and callback locks.
818		 */
819
820		if (size != old) {
821			truncate_pagecache(inode, size);
822			netfs_resize_file(&vnode->netfs, size, true);
823			fscache_resize_cookie(afs_vnode_cache(vnode), size);
824		}
825	}
826}
827
828static const struct afs_operation_ops afs_setattr_operation = {
829	.issue_afs_rpc	= afs_fs_setattr,
830	.issue_yfs_rpc	= yfs_fs_setattr,
831	.success	= afs_setattr_success,
832	.edit_dir	= afs_setattr_edit_file,
833};
834
835/*
836 * set the attributes of an inode
837 */
838int afs_setattr(struct mnt_idmap *idmap, struct dentry *dentry,
839		struct iattr *attr)
840{
841	const unsigned int supported =
842		ATTR_SIZE | ATTR_MODE | ATTR_UID | ATTR_GID |
843		ATTR_MTIME | ATTR_MTIME_SET | ATTR_TIMES_SET | ATTR_TOUCH;
844	struct afs_operation *op;
845	struct afs_vnode *vnode = AFS_FS_I(d_inode(dentry));
846	struct inode *inode = &vnode->netfs.inode;
847	loff_t i_size;
848	int ret;
849
850	_enter("{%llx:%llu},{n=%pd},%x",
851	       vnode->fid.vid, vnode->fid.vnode, dentry,
852	       attr->ia_valid);
853
854	if (!(attr->ia_valid & supported)) {
855		_leave(" = 0 [unsupported]");
856		return 0;
857	}
858
859	i_size = i_size_read(inode);
860	if (attr->ia_valid & ATTR_SIZE) {
861		if (!S_ISREG(inode->i_mode))
862			return -EISDIR;
863
864		ret = inode_newsize_ok(inode, attr->ia_size);
865		if (ret)
866			return ret;
867
868		if (attr->ia_size == i_size)
869			attr->ia_valid &= ~ATTR_SIZE;
870	}
871
872	fscache_use_cookie(afs_vnode_cache(vnode), true);
873
874	/* Prevent any new writebacks from starting whilst we do this. */
875	down_write(&vnode->validate_lock);
876
877	if ((attr->ia_valid & ATTR_SIZE) && S_ISREG(inode->i_mode)) {
878		loff_t size = attr->ia_size;
879
880		/* Wait for any outstanding writes to the server to complete */
881		loff_t from = min(size, i_size);
882		loff_t to = max(size, i_size);
883		ret = filemap_fdatawait_range(inode->i_mapping, from, to);
884		if (ret < 0)
885			goto out_unlock;
886
887		/* Don't talk to the server if we're just shortening in-memory
888		 * writes that haven't gone to the server yet.
889		 */
890		if (!(attr->ia_valid & (supported & ~ATTR_SIZE & ~ATTR_MTIME)) &&
891		    attr->ia_size < i_size &&
892		    attr->ia_size > vnode->netfs.remote_i_size) {
893			truncate_setsize(inode, attr->ia_size);
894			netfs_resize_file(&vnode->netfs, size, false);
895			fscache_resize_cookie(afs_vnode_cache(vnode),
896					      attr->ia_size);
897			ret = 0;
898			goto out_unlock;
899		}
900	}
901
902	op = afs_alloc_operation(((attr->ia_valid & ATTR_FILE) ?
903				  afs_file_key(attr->ia_file) : NULL),
904				 vnode->volume);
905	if (IS_ERR(op)) {
906		ret = PTR_ERR(op);
907		goto out_unlock;
908	}
909
910	afs_op_set_vnode(op, 0, vnode);
911	op->setattr.attr = attr;
912
913	if (attr->ia_valid & ATTR_SIZE) {
914		op->file[0].dv_delta = 1;
915		op->file[0].set_size = true;
916	}
917	op->ctime = attr->ia_ctime;
918	op->file[0].update_ctime = 1;
919	op->file[0].modification = true;
920
921	op->ops = &afs_setattr_operation;
922	ret = afs_do_sync_operation(op);
923
924out_unlock:
925	up_write(&vnode->validate_lock);
926	fscache_unuse_cookie(afs_vnode_cache(vnode), NULL, NULL);
927	_leave(" = %d", ret);
928	return ret;
929}