xref: /openbmc/linux/fs/ocfs2/inode.c (revision 4b4f3acc)
1 // SPDX-License-Identifier: GPL-2.0-or-later
2 /* -*- mode: c; c-basic-offset: 8; -*-
3  * vim: noexpandtab sw=8 ts=8 sts=0:
4  *
5  * inode.c
6  *
7  * vfs' aops, fops, dops and iops
8  *
9  * Copyright (C) 2002, 2004 Oracle.  All rights reserved.
10  */
11 
12 #include <linux/fs.h>
13 #include <linux/types.h>
14 #include <linux/highmem.h>
15 #include <linux/pagemap.h>
16 #include <linux/quotaops.h>
17 #include <linux/iversion.h>
18 
19 #include <asm/byteorder.h>
20 
21 #include <cluster/masklog.h>
22 
23 #include "ocfs2.h"
24 
25 #include "alloc.h"
26 #include "dir.h"
27 #include "blockcheck.h"
28 #include "dlmglue.h"
29 #include "extent_map.h"
30 #include "file.h"
31 #include "heartbeat.h"
32 #include "inode.h"
33 #include "journal.h"
34 #include "namei.h"
35 #include "suballoc.h"
36 #include "super.h"
37 #include "symlink.h"
38 #include "sysfile.h"
39 #include "uptodate.h"
40 #include "xattr.h"
41 #include "refcounttree.h"
42 #include "ocfs2_trace.h"
43 #include "filecheck.h"
44 
45 #include "buffer_head_io.h"
46 
47 struct ocfs2_find_inode_args
48 {
49 	u64		fi_blkno;
50 	unsigned long	fi_ino;
51 	unsigned int	fi_flags;
52 	unsigned int	fi_sysfile_type;
53 };
54 
55 static struct lock_class_key ocfs2_sysfile_lock_key[NUM_SYSTEM_INODES];
56 
57 static int ocfs2_read_locked_inode(struct inode *inode,
58 				   struct ocfs2_find_inode_args *args);
59 static int ocfs2_init_locked_inode(struct inode *inode, void *opaque);
60 static int ocfs2_find_actor(struct inode *inode, void *opaque);
61 static int ocfs2_truncate_for_delete(struct ocfs2_super *osb,
62 				    struct inode *inode,
63 				    struct buffer_head *fe_bh);
64 
65 static int ocfs2_filecheck_read_inode_block_full(struct inode *inode,
66 						 struct buffer_head **bh,
67 						 int flags, int type);
68 static int ocfs2_filecheck_validate_inode_block(struct super_block *sb,
69 						struct buffer_head *bh);
70 static int ocfs2_filecheck_repair_inode_block(struct super_block *sb,
71 					      struct buffer_head *bh);
72 
73 void ocfs2_set_inode_flags(struct inode *inode)
74 {
75 	unsigned int flags = OCFS2_I(inode)->ip_attr;
76 
77 	inode->i_flags &= ~(S_IMMUTABLE |
78 		S_SYNC | S_APPEND | S_NOATIME | S_DIRSYNC);
79 
80 	if (flags & OCFS2_IMMUTABLE_FL)
81 		inode->i_flags |= S_IMMUTABLE;
82 
83 	if (flags & OCFS2_SYNC_FL)
84 		inode->i_flags |= S_SYNC;
85 	if (flags & OCFS2_APPEND_FL)
86 		inode->i_flags |= S_APPEND;
87 	if (flags & OCFS2_NOATIME_FL)
88 		inode->i_flags |= S_NOATIME;
89 	if (flags & OCFS2_DIRSYNC_FL)
90 		inode->i_flags |= S_DIRSYNC;
91 }
92 
93 /* Propagate flags from i_flags to OCFS2_I(inode)->ip_attr */
94 void ocfs2_get_inode_flags(struct ocfs2_inode_info *oi)
95 {
96 	unsigned int flags = oi->vfs_inode.i_flags;
97 
98 	oi->ip_attr &= ~(OCFS2_SYNC_FL|OCFS2_APPEND_FL|
99 			OCFS2_IMMUTABLE_FL|OCFS2_NOATIME_FL|OCFS2_DIRSYNC_FL);
100 	if (flags & S_SYNC)
101 		oi->ip_attr |= OCFS2_SYNC_FL;
102 	if (flags & S_APPEND)
103 		oi->ip_attr |= OCFS2_APPEND_FL;
104 	if (flags & S_IMMUTABLE)
105 		oi->ip_attr |= OCFS2_IMMUTABLE_FL;
106 	if (flags & S_NOATIME)
107 		oi->ip_attr |= OCFS2_NOATIME_FL;
108 	if (flags & S_DIRSYNC)
109 		oi->ip_attr |= OCFS2_DIRSYNC_FL;
110 }
111 
112 struct inode *ocfs2_ilookup(struct super_block *sb, u64 blkno)
113 {
114 	struct ocfs2_find_inode_args args;
115 
116 	args.fi_blkno = blkno;
117 	args.fi_flags = 0;
118 	args.fi_ino = ino_from_blkno(sb, blkno);
119 	args.fi_sysfile_type = 0;
120 
121 	return ilookup5(sb, blkno, ocfs2_find_actor, &args);
122 }
123 struct inode *ocfs2_iget(struct ocfs2_super *osb, u64 blkno, unsigned flags,
124 			 int sysfile_type)
125 {
126 	int rc = -ESTALE;
127 	struct inode *inode = NULL;
128 	struct super_block *sb = osb->sb;
129 	struct ocfs2_find_inode_args args;
130 	journal_t *journal = OCFS2_SB(sb)->journal->j_journal;
131 
132 	trace_ocfs2_iget_begin((unsigned long long)blkno, flags,
133 			       sysfile_type);
134 
135 	/* Ok. By now we've either got the offsets passed to us by the
136 	 * caller, or we just pulled them off the bh. Lets do some
137 	 * sanity checks to make sure they're OK. */
138 	if (blkno == 0) {
139 		inode = ERR_PTR(-EINVAL);
140 		mlog_errno(PTR_ERR(inode));
141 		goto bail;
142 	}
143 
144 	args.fi_blkno = blkno;
145 	args.fi_flags = flags;
146 	args.fi_ino = ino_from_blkno(sb, blkno);
147 	args.fi_sysfile_type = sysfile_type;
148 
149 	inode = iget5_locked(sb, args.fi_ino, ocfs2_find_actor,
150 			     ocfs2_init_locked_inode, &args);
151 	/* inode was *not* in the inode cache. 2.6.x requires
152 	 * us to do our own read_inode call and unlock it
153 	 * afterwards. */
154 	if (inode == NULL) {
155 		inode = ERR_PTR(-ENOMEM);
156 		mlog_errno(PTR_ERR(inode));
157 		goto bail;
158 	}
159 	trace_ocfs2_iget5_locked(inode->i_state);
160 	if (inode->i_state & I_NEW) {
161 		rc = ocfs2_read_locked_inode(inode, &args);
162 		unlock_new_inode(inode);
163 	}
164 	if (is_bad_inode(inode)) {
165 		iput(inode);
166 		inode = ERR_PTR(rc);
167 		goto bail;
168 	}
169 
170 	/*
171 	 * Set transaction id's of transactions that have to be committed
172 	 * to finish f[data]sync. We set them to currently running transaction
173 	 * as we cannot be sure that the inode or some of its metadata isn't
174 	 * part of the transaction - the inode could have been reclaimed and
175 	 * now it is reread from disk.
176 	 */
177 	if (journal) {
178 		transaction_t *transaction;
179 		tid_t tid;
180 		struct ocfs2_inode_info *oi = OCFS2_I(inode);
181 
182 		read_lock(&journal->j_state_lock);
183 		if (journal->j_running_transaction)
184 			transaction = journal->j_running_transaction;
185 		else
186 			transaction = journal->j_committing_transaction;
187 		if (transaction)
188 			tid = transaction->t_tid;
189 		else
190 			tid = journal->j_commit_sequence;
191 		read_unlock(&journal->j_state_lock);
192 		oi->i_sync_tid = tid;
193 		oi->i_datasync_tid = tid;
194 	}
195 
196 bail:
197 	if (!IS_ERR(inode)) {
198 		trace_ocfs2_iget_end(inode,
199 			(unsigned long long)OCFS2_I(inode)->ip_blkno);
200 	}
201 
202 	return inode;
203 }
204 
205 
206 /*
207  * here's how inodes get read from disk:
208  * iget5_locked -> find_actor -> OCFS2_FIND_ACTOR
209  * found? : return the in-memory inode
210  * not found? : get_new_inode -> OCFS2_INIT_LOCKED_INODE
211  */
212 
213 static int ocfs2_find_actor(struct inode *inode, void *opaque)
214 {
215 	struct ocfs2_find_inode_args *args = NULL;
216 	struct ocfs2_inode_info *oi = OCFS2_I(inode);
217 	int ret = 0;
218 
219 	args = opaque;
220 
221 	mlog_bug_on_msg(!inode, "No inode in find actor!\n");
222 
223 	trace_ocfs2_find_actor(inode, inode->i_ino, opaque, args->fi_blkno);
224 
225 	if (oi->ip_blkno != args->fi_blkno)
226 		goto bail;
227 
228 	ret = 1;
229 bail:
230 	return ret;
231 }
232 
233 /*
234  * initialize the new inode, but don't do anything that would cause
235  * us to sleep.
236  * return 0 on success, 1 on failure
237  */
238 static int ocfs2_init_locked_inode(struct inode *inode, void *opaque)
239 {
240 	struct ocfs2_find_inode_args *args = opaque;
241 	static struct lock_class_key ocfs2_quota_ip_alloc_sem_key,
242 				     ocfs2_file_ip_alloc_sem_key;
243 
244 	inode->i_ino = args->fi_ino;
245 	OCFS2_I(inode)->ip_blkno = args->fi_blkno;
246 	if (args->fi_sysfile_type != 0)
247 		lockdep_set_class(&inode->i_rwsem,
248 			&ocfs2_sysfile_lock_key[args->fi_sysfile_type]);
249 	if (args->fi_sysfile_type == USER_QUOTA_SYSTEM_INODE ||
250 	    args->fi_sysfile_type == GROUP_QUOTA_SYSTEM_INODE ||
251 	    args->fi_sysfile_type == LOCAL_USER_QUOTA_SYSTEM_INODE ||
252 	    args->fi_sysfile_type == LOCAL_GROUP_QUOTA_SYSTEM_INODE)
253 		lockdep_set_class(&OCFS2_I(inode)->ip_alloc_sem,
254 				  &ocfs2_quota_ip_alloc_sem_key);
255 	else
256 		lockdep_set_class(&OCFS2_I(inode)->ip_alloc_sem,
257 				  &ocfs2_file_ip_alloc_sem_key);
258 
259 	return 0;
260 }
261 
262 void ocfs2_populate_inode(struct inode *inode, struct ocfs2_dinode *fe,
263 			  int create_ino)
264 {
265 	struct super_block *sb;
266 	struct ocfs2_super *osb;
267 	int use_plocks = 1;
268 
269 	sb = inode->i_sb;
270 	osb = OCFS2_SB(sb);
271 
272 	if ((osb->s_mount_opt & OCFS2_MOUNT_LOCALFLOCKS) ||
273 	    ocfs2_mount_local(osb) || !ocfs2_stack_supports_plocks())
274 		use_plocks = 0;
275 
276 	/*
277 	 * These have all been checked by ocfs2_read_inode_block() or set
278 	 * by ocfs2_mknod_locked(), so a failure is a code bug.
279 	 */
280 	BUG_ON(!OCFS2_IS_VALID_DINODE(fe));  /* This means that read_inode
281 						cannot create a superblock
282 						inode today.  change if
283 						that is needed. */
284 	BUG_ON(!(fe->i_flags & cpu_to_le32(OCFS2_VALID_FL)));
285 	BUG_ON(le32_to_cpu(fe->i_fs_generation) != osb->fs_generation);
286 
287 
288 	OCFS2_I(inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
289 	OCFS2_I(inode)->ip_attr = le32_to_cpu(fe->i_attr);
290 	OCFS2_I(inode)->ip_dyn_features = le16_to_cpu(fe->i_dyn_features);
291 
292 	inode_set_iversion(inode, 1);
293 	inode->i_generation = le32_to_cpu(fe->i_generation);
294 	inode->i_rdev = huge_decode_dev(le64_to_cpu(fe->id1.dev1.i_rdev));
295 	inode->i_mode = le16_to_cpu(fe->i_mode);
296 	i_uid_write(inode, le32_to_cpu(fe->i_uid));
297 	i_gid_write(inode, le32_to_cpu(fe->i_gid));
298 
299 	/* Fast symlinks will have i_size but no allocated clusters. */
300 	if (S_ISLNK(inode->i_mode) && !fe->i_clusters) {
301 		inode->i_blocks = 0;
302 		inode->i_mapping->a_ops = &ocfs2_fast_symlink_aops;
303 	} else {
304 		inode->i_blocks = ocfs2_inode_sector_count(inode);
305 		inode->i_mapping->a_ops = &ocfs2_aops;
306 	}
307 	inode->i_atime.tv_sec = le64_to_cpu(fe->i_atime);
308 	inode->i_atime.tv_nsec = le32_to_cpu(fe->i_atime_nsec);
309 	inode->i_mtime.tv_sec = le64_to_cpu(fe->i_mtime);
310 	inode->i_mtime.tv_nsec = le32_to_cpu(fe->i_mtime_nsec);
311 	inode->i_ctime.tv_sec = le64_to_cpu(fe->i_ctime);
312 	inode->i_ctime.tv_nsec = le32_to_cpu(fe->i_ctime_nsec);
313 
314 	if (OCFS2_I(inode)->ip_blkno != le64_to_cpu(fe->i_blkno))
315 		mlog(ML_ERROR,
316 		     "ip_blkno %llu != i_blkno %llu!\n",
317 		     (unsigned long long)OCFS2_I(inode)->ip_blkno,
318 		     (unsigned long long)le64_to_cpu(fe->i_blkno));
319 
320 	set_nlink(inode, ocfs2_read_links_count(fe));
321 
322 	trace_ocfs2_populate_inode(OCFS2_I(inode)->ip_blkno,
323 				   le32_to_cpu(fe->i_flags));
324 	if (fe->i_flags & cpu_to_le32(OCFS2_SYSTEM_FL)) {
325 		OCFS2_I(inode)->ip_flags |= OCFS2_INODE_SYSTEM_FILE;
326 		inode->i_flags |= S_NOQUOTA;
327 	}
328 
329 	if (fe->i_flags & cpu_to_le32(OCFS2_LOCAL_ALLOC_FL)) {
330 		OCFS2_I(inode)->ip_flags |= OCFS2_INODE_BITMAP;
331 	} else if (fe->i_flags & cpu_to_le32(OCFS2_BITMAP_FL)) {
332 		OCFS2_I(inode)->ip_flags |= OCFS2_INODE_BITMAP;
333 	} else if (fe->i_flags & cpu_to_le32(OCFS2_QUOTA_FL)) {
334 		inode->i_flags |= S_NOQUOTA;
335 	} else if (fe->i_flags & cpu_to_le32(OCFS2_SUPER_BLOCK_FL)) {
336 		/* we can't actually hit this as read_inode can't
337 		 * handle superblocks today ;-) */
338 		BUG();
339 	}
340 
341 	switch (inode->i_mode & S_IFMT) {
342 	    case S_IFREG:
343 		    if (use_plocks)
344 			    inode->i_fop = &ocfs2_fops;
345 		    else
346 			    inode->i_fop = &ocfs2_fops_no_plocks;
347 		    inode->i_op = &ocfs2_file_iops;
348 		    i_size_write(inode, le64_to_cpu(fe->i_size));
349 		    break;
350 	    case S_IFDIR:
351 		    inode->i_op = &ocfs2_dir_iops;
352 		    if (use_plocks)
353 			    inode->i_fop = &ocfs2_dops;
354 		    else
355 			    inode->i_fop = &ocfs2_dops_no_plocks;
356 		    i_size_write(inode, le64_to_cpu(fe->i_size));
357 		    OCFS2_I(inode)->ip_dir_lock_gen = 1;
358 		    break;
359 	    case S_IFLNK:
360 		    inode->i_op = &ocfs2_symlink_inode_operations;
361 		    inode_nohighmem(inode);
362 		    i_size_write(inode, le64_to_cpu(fe->i_size));
363 		    break;
364 	    default:
365 		    inode->i_op = &ocfs2_special_file_iops;
366 		    init_special_inode(inode, inode->i_mode,
367 				       inode->i_rdev);
368 		    break;
369 	}
370 
371 	if (create_ino) {
372 		inode->i_ino = ino_from_blkno(inode->i_sb,
373 			       le64_to_cpu(fe->i_blkno));
374 
375 		/*
376 		 * If we ever want to create system files from kernel,
377 		 * the generation argument to
378 		 * ocfs2_inode_lock_res_init() will have to change.
379 		 */
380 		BUG_ON(le32_to_cpu(fe->i_flags) & OCFS2_SYSTEM_FL);
381 
382 		ocfs2_inode_lock_res_init(&OCFS2_I(inode)->ip_inode_lockres,
383 					  OCFS2_LOCK_TYPE_META, 0, inode);
384 
385 		ocfs2_inode_lock_res_init(&OCFS2_I(inode)->ip_open_lockres,
386 					  OCFS2_LOCK_TYPE_OPEN, 0, inode);
387 	}
388 
389 	ocfs2_inode_lock_res_init(&OCFS2_I(inode)->ip_rw_lockres,
390 				  OCFS2_LOCK_TYPE_RW, inode->i_generation,
391 				  inode);
392 
393 	ocfs2_set_inode_flags(inode);
394 
395 	OCFS2_I(inode)->ip_last_used_slot = 0;
396 	OCFS2_I(inode)->ip_last_used_group = 0;
397 
398 	if (S_ISDIR(inode->i_mode))
399 		ocfs2_resv_set_type(&OCFS2_I(inode)->ip_la_data_resv,
400 				    OCFS2_RESV_FLAG_DIR);
401 }
402 
403 static int ocfs2_read_locked_inode(struct inode *inode,
404 				   struct ocfs2_find_inode_args *args)
405 {
406 	struct super_block *sb;
407 	struct ocfs2_super *osb;
408 	struct ocfs2_dinode *fe;
409 	struct buffer_head *bh = NULL;
410 	int status, can_lock, lock_level = 0;
411 	u32 generation = 0;
412 
413 	status = -EINVAL;
414 	sb = inode->i_sb;
415 	osb = OCFS2_SB(sb);
416 
417 	/*
418 	 * To improve performance of cold-cache inode stats, we take
419 	 * the cluster lock here if possible.
420 	 *
421 	 * Generally, OCFS2 never trusts the contents of an inode
422 	 * unless it's holding a cluster lock, so taking it here isn't
423 	 * a correctness issue as much as it is a performance
424 	 * improvement.
425 	 *
426 	 * There are three times when taking the lock is not a good idea:
427 	 *
428 	 * 1) During startup, before we have initialized the DLM.
429 	 *
430 	 * 2) If we are reading certain system files which never get
431 	 *    cluster locks (local alloc, truncate log).
432 	 *
433 	 * 3) If the process doing the iget() is responsible for
434 	 *    orphan dir recovery. We're holding the orphan dir lock and
435 	 *    can get into a deadlock with another process on another
436 	 *    node in ->delete_inode().
437 	 *
438 	 * #1 and #2 can be simply solved by never taking the lock
439 	 * here for system files (which are the only type we read
440 	 * during mount). It's a heavier approach, but our main
441 	 * concern is user-accessible files anyway.
442 	 *
443 	 * #3 works itself out because we'll eventually take the
444 	 * cluster lock before trusting anything anyway.
445 	 */
446 	can_lock = !(args->fi_flags & OCFS2_FI_FLAG_SYSFILE)
447 		&& !(args->fi_flags & OCFS2_FI_FLAG_ORPHAN_RECOVERY)
448 		&& !ocfs2_mount_local(osb);
449 
450 	trace_ocfs2_read_locked_inode(
451 		(unsigned long long)OCFS2_I(inode)->ip_blkno, can_lock);
452 
453 	/*
454 	 * To maintain backwards compatibility with older versions of
455 	 * ocfs2-tools, we still store the generation value for system
456 	 * files. The only ones that actually matter to userspace are
457 	 * the journals, but it's easier and inexpensive to just flag
458 	 * all system files similarly.
459 	 */
460 	if (args->fi_flags & OCFS2_FI_FLAG_SYSFILE)
461 		generation = osb->fs_generation;
462 
463 	ocfs2_inode_lock_res_init(&OCFS2_I(inode)->ip_inode_lockres,
464 				  OCFS2_LOCK_TYPE_META,
465 				  generation, inode);
466 
467 	ocfs2_inode_lock_res_init(&OCFS2_I(inode)->ip_open_lockres,
468 				  OCFS2_LOCK_TYPE_OPEN,
469 				  0, inode);
470 
471 	if (can_lock) {
472 		status = ocfs2_open_lock(inode);
473 		if (status) {
474 			make_bad_inode(inode);
475 			mlog_errno(status);
476 			return status;
477 		}
478 		status = ocfs2_inode_lock(inode, NULL, lock_level);
479 		if (status) {
480 			make_bad_inode(inode);
481 			mlog_errno(status);
482 			return status;
483 		}
484 	}
485 
486 	if (args->fi_flags & OCFS2_FI_FLAG_ORPHAN_RECOVERY) {
487 		status = ocfs2_try_open_lock(inode, 0);
488 		if (status) {
489 			make_bad_inode(inode);
490 			return status;
491 		}
492 	}
493 
494 	if (can_lock) {
495 		if (args->fi_flags & OCFS2_FI_FLAG_FILECHECK_CHK)
496 			status = ocfs2_filecheck_read_inode_block_full(inode,
497 						&bh, OCFS2_BH_IGNORE_CACHE, 0);
498 		else if (args->fi_flags & OCFS2_FI_FLAG_FILECHECK_FIX)
499 			status = ocfs2_filecheck_read_inode_block_full(inode,
500 						&bh, OCFS2_BH_IGNORE_CACHE, 1);
501 		else
502 			status = ocfs2_read_inode_block_full(inode,
503 						&bh, OCFS2_BH_IGNORE_CACHE);
504 	} else {
505 		status = ocfs2_read_blocks_sync(osb, args->fi_blkno, 1, &bh);
506 		/*
507 		 * If buffer is in jbd, then its checksum may not have been
508 		 * computed as yet.
509 		 */
510 		if (!status && !buffer_jbd(bh)) {
511 			if (args->fi_flags & OCFS2_FI_FLAG_FILECHECK_CHK)
512 				status = ocfs2_filecheck_validate_inode_block(
513 								osb->sb, bh);
514 			else if (args->fi_flags & OCFS2_FI_FLAG_FILECHECK_FIX)
515 				status = ocfs2_filecheck_repair_inode_block(
516 								osb->sb, bh);
517 			else
518 				status = ocfs2_validate_inode_block(
519 								osb->sb, bh);
520 		}
521 	}
522 	if (status < 0) {
523 		mlog_errno(status);
524 		goto bail;
525 	}
526 
527 	status = -EINVAL;
528 	fe = (struct ocfs2_dinode *) bh->b_data;
529 
530 	/*
531 	 * This is a code bug. Right now the caller needs to
532 	 * understand whether it is asking for a system file inode or
533 	 * not so the proper lock names can be built.
534 	 */
535 	mlog_bug_on_msg(!!(fe->i_flags & cpu_to_le32(OCFS2_SYSTEM_FL)) !=
536 			!!(args->fi_flags & OCFS2_FI_FLAG_SYSFILE),
537 			"Inode %llu: system file state is ambigous\n",
538 			(unsigned long long)args->fi_blkno);
539 
540 	if (S_ISCHR(le16_to_cpu(fe->i_mode)) ||
541 	    S_ISBLK(le16_to_cpu(fe->i_mode)))
542 		inode->i_rdev = huge_decode_dev(le64_to_cpu(fe->id1.dev1.i_rdev));
543 
544 	ocfs2_populate_inode(inode, fe, 0);
545 
546 	BUG_ON(args->fi_blkno != le64_to_cpu(fe->i_blkno));
547 
548 	if (buffer_dirty(bh) && !buffer_jbd(bh)) {
549 		if (can_lock) {
550 			ocfs2_inode_unlock(inode, lock_level);
551 			lock_level = 1;
552 			ocfs2_inode_lock(inode, NULL, lock_level);
553 		}
554 		status = ocfs2_write_block(osb, bh, INODE_CACHE(inode));
555 		if (status < 0) {
556 			mlog_errno(status);
557 			goto bail;
558 		}
559 	}
560 
561 	status = 0;
562 
563 bail:
564 	if (can_lock)
565 		ocfs2_inode_unlock(inode, lock_level);
566 
567 	if (status < 0)
568 		make_bad_inode(inode);
569 
570 	brelse(bh);
571 
572 	return status;
573 }
574 
575 void ocfs2_sync_blockdev(struct super_block *sb)
576 {
577 	sync_blockdev(sb->s_bdev);
578 }
579 
580 static int ocfs2_truncate_for_delete(struct ocfs2_super *osb,
581 				     struct inode *inode,
582 				     struct buffer_head *fe_bh)
583 {
584 	int status = 0;
585 	struct ocfs2_dinode *fe;
586 	handle_t *handle = NULL;
587 
588 	fe = (struct ocfs2_dinode *) fe_bh->b_data;
589 
590 	/*
591 	 * This check will also skip truncate of inodes with inline
592 	 * data and fast symlinks.
593 	 */
594 	if (fe->i_clusters) {
595 		if (ocfs2_should_order_data(inode))
596 			ocfs2_begin_ordered_truncate(inode, 0);
597 
598 		handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
599 		if (IS_ERR(handle)) {
600 			status = PTR_ERR(handle);
601 			handle = NULL;
602 			mlog_errno(status);
603 			goto out;
604 		}
605 
606 		status = ocfs2_journal_access_di(handle, INODE_CACHE(inode),
607 						 fe_bh,
608 						 OCFS2_JOURNAL_ACCESS_WRITE);
609 		if (status < 0) {
610 			mlog_errno(status);
611 			goto out;
612 		}
613 
614 		i_size_write(inode, 0);
615 
616 		status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
617 		if (status < 0) {
618 			mlog_errno(status);
619 			goto out;
620 		}
621 
622 		ocfs2_commit_trans(osb, handle);
623 		handle = NULL;
624 
625 		status = ocfs2_commit_truncate(osb, inode, fe_bh);
626 		if (status < 0)
627 			mlog_errno(status);
628 	}
629 
630 out:
631 	if (handle)
632 		ocfs2_commit_trans(osb, handle);
633 	return status;
634 }
635 
636 static int ocfs2_remove_inode(struct inode *inode,
637 			      struct buffer_head *di_bh,
638 			      struct inode *orphan_dir_inode,
639 			      struct buffer_head *orphan_dir_bh)
640 {
641 	int status;
642 	struct inode *inode_alloc_inode = NULL;
643 	struct buffer_head *inode_alloc_bh = NULL;
644 	handle_t *handle;
645 	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
646 	struct ocfs2_dinode *di = (struct ocfs2_dinode *) di_bh->b_data;
647 
648 	inode_alloc_inode =
649 		ocfs2_get_system_file_inode(osb, INODE_ALLOC_SYSTEM_INODE,
650 					    le16_to_cpu(di->i_suballoc_slot));
651 	if (!inode_alloc_inode) {
652 		status = -ENOENT;
653 		mlog_errno(status);
654 		goto bail;
655 	}
656 
657 	inode_lock(inode_alloc_inode);
658 	status = ocfs2_inode_lock(inode_alloc_inode, &inode_alloc_bh, 1);
659 	if (status < 0) {
660 		inode_unlock(inode_alloc_inode);
661 
662 		mlog_errno(status);
663 		goto bail;
664 	}
665 
666 	handle = ocfs2_start_trans(osb, OCFS2_DELETE_INODE_CREDITS +
667 				   ocfs2_quota_trans_credits(inode->i_sb));
668 	if (IS_ERR(handle)) {
669 		status = PTR_ERR(handle);
670 		mlog_errno(status);
671 		goto bail_unlock;
672 	}
673 
674 	if (!(OCFS2_I(inode)->ip_flags & OCFS2_INODE_SKIP_ORPHAN_DIR)) {
675 		status = ocfs2_orphan_del(osb, handle, orphan_dir_inode, inode,
676 					  orphan_dir_bh, false);
677 		if (status < 0) {
678 			mlog_errno(status);
679 			goto bail_commit;
680 		}
681 	}
682 
683 	/* set the inodes dtime */
684 	status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), di_bh,
685 					 OCFS2_JOURNAL_ACCESS_WRITE);
686 	if (status < 0) {
687 		mlog_errno(status);
688 		goto bail_commit;
689 	}
690 
691 	di->i_dtime = cpu_to_le64(ktime_get_real_seconds());
692 	di->i_flags &= cpu_to_le32(~(OCFS2_VALID_FL | OCFS2_ORPHANED_FL));
693 	ocfs2_journal_dirty(handle, di_bh);
694 
695 	ocfs2_remove_from_cache(INODE_CACHE(inode), di_bh);
696 	dquot_free_inode(inode);
697 
698 	status = ocfs2_free_dinode(handle, inode_alloc_inode,
699 				   inode_alloc_bh, di);
700 	if (status < 0)
701 		mlog_errno(status);
702 
703 bail_commit:
704 	ocfs2_commit_trans(osb, handle);
705 bail_unlock:
706 	ocfs2_inode_unlock(inode_alloc_inode, 1);
707 	inode_unlock(inode_alloc_inode);
708 	brelse(inode_alloc_bh);
709 bail:
710 	iput(inode_alloc_inode);
711 
712 	return status;
713 }
714 
715 /*
716  * Serialize with orphan dir recovery. If the process doing
717  * recovery on this orphan dir does an iget() with the dir
718  * i_mutex held, we'll deadlock here. Instead we detect this
719  * and exit early - recovery will wipe this inode for us.
720  */
721 static int ocfs2_check_orphan_recovery_state(struct ocfs2_super *osb,
722 					     int slot)
723 {
724 	int ret = 0;
725 
726 	spin_lock(&osb->osb_lock);
727 	if (ocfs2_node_map_test_bit(osb, &osb->osb_recovering_orphan_dirs, slot)) {
728 		ret = -EDEADLK;
729 		goto out;
730 	}
731 	/* This signals to the orphan recovery process that it should
732 	 * wait for us to handle the wipe. */
733 	osb->osb_orphan_wipes[slot]++;
734 out:
735 	spin_unlock(&osb->osb_lock);
736 	trace_ocfs2_check_orphan_recovery_state(slot, ret);
737 	return ret;
738 }
739 
740 static void ocfs2_signal_wipe_completion(struct ocfs2_super *osb,
741 					 int slot)
742 {
743 	spin_lock(&osb->osb_lock);
744 	osb->osb_orphan_wipes[slot]--;
745 	spin_unlock(&osb->osb_lock);
746 
747 	wake_up(&osb->osb_wipe_event);
748 }
749 
750 static int ocfs2_wipe_inode(struct inode *inode,
751 			    struct buffer_head *di_bh)
752 {
753 	int status, orphaned_slot = -1;
754 	struct inode *orphan_dir_inode = NULL;
755 	struct buffer_head *orphan_dir_bh = NULL;
756 	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
757 	struct ocfs2_dinode *di = (struct ocfs2_dinode *) di_bh->b_data;
758 
759 	if (!(OCFS2_I(inode)->ip_flags & OCFS2_INODE_SKIP_ORPHAN_DIR)) {
760 		orphaned_slot = le16_to_cpu(di->i_orphaned_slot);
761 
762 		status = ocfs2_check_orphan_recovery_state(osb, orphaned_slot);
763 		if (status)
764 			return status;
765 
766 		orphan_dir_inode = ocfs2_get_system_file_inode(osb,
767 							       ORPHAN_DIR_SYSTEM_INODE,
768 							       orphaned_slot);
769 		if (!orphan_dir_inode) {
770 			status = -ENOENT;
771 			mlog_errno(status);
772 			goto bail;
773 		}
774 
775 		/* Lock the orphan dir. The lock will be held for the entire
776 		 * delete_inode operation. We do this now to avoid races with
777 		 * recovery completion on other nodes. */
778 		inode_lock(orphan_dir_inode);
779 		status = ocfs2_inode_lock(orphan_dir_inode, &orphan_dir_bh, 1);
780 		if (status < 0) {
781 			inode_unlock(orphan_dir_inode);
782 
783 			mlog_errno(status);
784 			goto bail;
785 		}
786 	}
787 
788 	/* we do this while holding the orphan dir lock because we
789 	 * don't want recovery being run from another node to try an
790 	 * inode delete underneath us -- this will result in two nodes
791 	 * truncating the same file! */
792 	status = ocfs2_truncate_for_delete(osb, inode, di_bh);
793 	if (status < 0) {
794 		mlog_errno(status);
795 		goto bail_unlock_dir;
796 	}
797 
798 	/* Remove any dir index tree */
799 	if (S_ISDIR(inode->i_mode)) {
800 		status = ocfs2_dx_dir_truncate(inode, di_bh);
801 		if (status) {
802 			mlog_errno(status);
803 			goto bail_unlock_dir;
804 		}
805 	}
806 
807 	/*Free extended attribute resources associated with this inode.*/
808 	status = ocfs2_xattr_remove(inode, di_bh);
809 	if (status < 0) {
810 		mlog_errno(status);
811 		goto bail_unlock_dir;
812 	}
813 
814 	status = ocfs2_remove_refcount_tree(inode, di_bh);
815 	if (status < 0) {
816 		mlog_errno(status);
817 		goto bail_unlock_dir;
818 	}
819 
820 	status = ocfs2_remove_inode(inode, di_bh, orphan_dir_inode,
821 				    orphan_dir_bh);
822 	if (status < 0)
823 		mlog_errno(status);
824 
825 bail_unlock_dir:
826 	if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_SKIP_ORPHAN_DIR)
827 		return status;
828 
829 	ocfs2_inode_unlock(orphan_dir_inode, 1);
830 	inode_unlock(orphan_dir_inode);
831 	brelse(orphan_dir_bh);
832 bail:
833 	iput(orphan_dir_inode);
834 	ocfs2_signal_wipe_completion(osb, orphaned_slot);
835 
836 	return status;
837 }
838 
839 /* There is a series of simple checks that should be done before a
840  * trylock is even considered. Encapsulate those in this function. */
841 static int ocfs2_inode_is_valid_to_delete(struct inode *inode)
842 {
843 	int ret = 0;
844 	struct ocfs2_inode_info *oi = OCFS2_I(inode);
845 	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
846 
847 	trace_ocfs2_inode_is_valid_to_delete(current, osb->dc_task,
848 					     (unsigned long long)oi->ip_blkno,
849 					     oi->ip_flags);
850 
851 	/* We shouldn't be getting here for the root directory
852 	 * inode.. */
853 	if (inode == osb->root_inode) {
854 		mlog(ML_ERROR, "Skipping delete of root inode.\n");
855 		goto bail;
856 	}
857 
858 	/*
859 	 * If we're coming from downconvert_thread we can't go into our own
860 	 * voting [hello, deadlock city!] so we cannot delete the inode. But
861 	 * since we dropped last inode ref when downconverting dentry lock,
862 	 * we cannot have the file open and thus the node doing unlink will
863 	 * take care of deleting the inode.
864 	 */
865 	if (current == osb->dc_task)
866 		goto bail;
867 
868 	spin_lock(&oi->ip_lock);
869 	/* OCFS2 *never* deletes system files. This should technically
870 	 * never get here as system file inodes should always have a
871 	 * positive link count. */
872 	if (oi->ip_flags & OCFS2_INODE_SYSTEM_FILE) {
873 		mlog(ML_ERROR, "Skipping delete of system file %llu\n",
874 		     (unsigned long long)oi->ip_blkno);
875 		goto bail_unlock;
876 	}
877 
878 	ret = 1;
879 bail_unlock:
880 	spin_unlock(&oi->ip_lock);
881 bail:
882 	return ret;
883 }
884 
885 /* Query the cluster to determine whether we should wipe an inode from
886  * disk or not.
887  *
888  * Requires the inode to have the cluster lock. */
889 static int ocfs2_query_inode_wipe(struct inode *inode,
890 				  struct buffer_head *di_bh,
891 				  int *wipe)
892 {
893 	int status = 0, reason = 0;
894 	struct ocfs2_inode_info *oi = OCFS2_I(inode);
895 	struct ocfs2_dinode *di;
896 
897 	*wipe = 0;
898 
899 	trace_ocfs2_query_inode_wipe_begin((unsigned long long)oi->ip_blkno,
900 					   inode->i_nlink);
901 
902 	/* While we were waiting for the cluster lock in
903 	 * ocfs2_delete_inode, another node might have asked to delete
904 	 * the inode. Recheck our flags to catch this. */
905 	if (!ocfs2_inode_is_valid_to_delete(inode)) {
906 		reason = 1;
907 		goto bail;
908 	}
909 
910 	/* Now that we have an up to date inode, we can double check
911 	 * the link count. */
912 	if (inode->i_nlink)
913 		goto bail;
914 
915 	/* Do some basic inode verification... */
916 	di = (struct ocfs2_dinode *) di_bh->b_data;
917 	if (!(di->i_flags & cpu_to_le32(OCFS2_ORPHANED_FL)) &&
918 	    !(oi->ip_flags & OCFS2_INODE_SKIP_ORPHAN_DIR)) {
919 		/*
920 		 * Inodes in the orphan dir must have ORPHANED_FL.  The only
921 		 * inodes that come back out of the orphan dir are reflink
922 		 * targets. A reflink target may be moved out of the orphan
923 		 * dir between the time we scan the directory and the time we
924 		 * process it. This would lead to HAS_REFCOUNT_FL being set but
925 		 * ORPHANED_FL not.
926 		 */
927 		if (di->i_dyn_features & cpu_to_le16(OCFS2_HAS_REFCOUNT_FL)) {
928 			reason = 2;
929 			goto bail;
930 		}
931 
932 		/* for lack of a better error? */
933 		status = -EEXIST;
934 		mlog(ML_ERROR,
935 		     "Inode %llu (on-disk %llu) not orphaned! "
936 		     "Disk flags  0x%x, inode flags 0x%x\n",
937 		     (unsigned long long)oi->ip_blkno,
938 		     (unsigned long long)le64_to_cpu(di->i_blkno),
939 		     le32_to_cpu(di->i_flags), oi->ip_flags);
940 		goto bail;
941 	}
942 
943 	/* has someone already deleted us?! baaad... */
944 	if (di->i_dtime) {
945 		status = -EEXIST;
946 		mlog_errno(status);
947 		goto bail;
948 	}
949 
950 	/*
951 	 * This is how ocfs2 determines whether an inode is still live
952 	 * within the cluster. Every node takes a shared read lock on
953 	 * the inode open lock in ocfs2_read_locked_inode(). When we
954 	 * get to ->delete_inode(), each node tries to convert it's
955 	 * lock to an exclusive. Trylocks are serialized by the inode
956 	 * meta data lock. If the upconvert succeeds, we know the inode
957 	 * is no longer live and can be deleted.
958 	 *
959 	 * Though we call this with the meta data lock held, the
960 	 * trylock keeps us from ABBA deadlock.
961 	 */
962 	status = ocfs2_try_open_lock(inode, 1);
963 	if (status == -EAGAIN) {
964 		status = 0;
965 		reason = 3;
966 		goto bail;
967 	}
968 	if (status < 0) {
969 		mlog_errno(status);
970 		goto bail;
971 	}
972 
973 	*wipe = 1;
974 	trace_ocfs2_query_inode_wipe_succ(le16_to_cpu(di->i_orphaned_slot));
975 
976 bail:
977 	trace_ocfs2_query_inode_wipe_end(status, reason);
978 	return status;
979 }
980 
981 /* Support function for ocfs2_delete_inode. Will help us keep the
982  * inode data in a consistent state for clear_inode. Always truncates
983  * pages, optionally sync's them first. */
984 static void ocfs2_cleanup_delete_inode(struct inode *inode,
985 				       int sync_data)
986 {
987 	trace_ocfs2_cleanup_delete_inode(
988 		(unsigned long long)OCFS2_I(inode)->ip_blkno, sync_data);
989 	if (sync_data)
990 		filemap_write_and_wait(inode->i_mapping);
991 	truncate_inode_pages_final(&inode->i_data);
992 }
993 
994 static void ocfs2_delete_inode(struct inode *inode)
995 {
996 	int wipe, status;
997 	sigset_t oldset;
998 	struct buffer_head *di_bh = NULL;
999 	struct ocfs2_dinode *di = NULL;
1000 
1001 	trace_ocfs2_delete_inode(inode->i_ino,
1002 				 (unsigned long long)OCFS2_I(inode)->ip_blkno,
1003 				 is_bad_inode(inode));
1004 
1005 	/* When we fail in read_inode() we mark inode as bad. The second test
1006 	 * catches the case when inode allocation fails before allocating
1007 	 * a block for inode. */
1008 	if (is_bad_inode(inode) || !OCFS2_I(inode)->ip_blkno)
1009 		goto bail;
1010 
1011 	if (!ocfs2_inode_is_valid_to_delete(inode)) {
1012 		/* It's probably not necessary to truncate_inode_pages
1013 		 * here but we do it for safety anyway (it will most
1014 		 * likely be a no-op anyway) */
1015 		ocfs2_cleanup_delete_inode(inode, 0);
1016 		goto bail;
1017 	}
1018 
1019 	dquot_initialize(inode);
1020 
1021 	/* We want to block signals in delete_inode as the lock and
1022 	 * messaging paths may return us -ERESTARTSYS. Which would
1023 	 * cause us to exit early, resulting in inodes being orphaned
1024 	 * forever. */
1025 	ocfs2_block_signals(&oldset);
1026 
1027 	/*
1028 	 * Synchronize us against ocfs2_get_dentry. We take this in
1029 	 * shared mode so that all nodes can still concurrently
1030 	 * process deletes.
1031 	 */
1032 	status = ocfs2_nfs_sync_lock(OCFS2_SB(inode->i_sb), 0);
1033 	if (status < 0) {
1034 		mlog(ML_ERROR, "getting nfs sync lock(PR) failed %d\n", status);
1035 		ocfs2_cleanup_delete_inode(inode, 0);
1036 		goto bail_unblock;
1037 	}
1038 	/* Lock down the inode. This gives us an up to date view of
1039 	 * it's metadata (for verification), and allows us to
1040 	 * serialize delete_inode on multiple nodes.
1041 	 *
1042 	 * Even though we might be doing a truncate, we don't take the
1043 	 * allocation lock here as it won't be needed - nobody will
1044 	 * have the file open.
1045 	 */
1046 	status = ocfs2_inode_lock(inode, &di_bh, 1);
1047 	if (status < 0) {
1048 		if (status != -ENOENT)
1049 			mlog_errno(status);
1050 		ocfs2_cleanup_delete_inode(inode, 0);
1051 		goto bail_unlock_nfs_sync;
1052 	}
1053 
1054 	di = (struct ocfs2_dinode *)di_bh->b_data;
1055 	/* Skip inode deletion and wait for dio orphan entry recovered
1056 	 * first */
1057 	if (unlikely(di->i_flags & cpu_to_le32(OCFS2_DIO_ORPHANED_FL))) {
1058 		ocfs2_cleanup_delete_inode(inode, 0);
1059 		goto bail_unlock_inode;
1060 	}
1061 
1062 	/* Query the cluster. This will be the final decision made
1063 	 * before we go ahead and wipe the inode. */
1064 	status = ocfs2_query_inode_wipe(inode, di_bh, &wipe);
1065 	if (!wipe || status < 0) {
1066 		/* Error and remote inode busy both mean we won't be
1067 		 * removing the inode, so they take almost the same
1068 		 * path. */
1069 		if (status < 0)
1070 			mlog_errno(status);
1071 
1072 		/* Someone in the cluster has disallowed a wipe of
1073 		 * this inode, or it was never completely
1074 		 * orphaned. Write out the pages and exit now. */
1075 		ocfs2_cleanup_delete_inode(inode, 1);
1076 		goto bail_unlock_inode;
1077 	}
1078 
1079 	ocfs2_cleanup_delete_inode(inode, 0);
1080 
1081 	status = ocfs2_wipe_inode(inode, di_bh);
1082 	if (status < 0) {
1083 		if (status != -EDEADLK)
1084 			mlog_errno(status);
1085 		goto bail_unlock_inode;
1086 	}
1087 
1088 	/*
1089 	 * Mark the inode as successfully deleted.
1090 	 *
1091 	 * This is important for ocfs2_clear_inode() as it will check
1092 	 * this flag and skip any checkpointing work
1093 	 *
1094 	 * ocfs2_stuff_meta_lvb() also uses this flag to invalidate
1095 	 * the LVB for other nodes.
1096 	 */
1097 	OCFS2_I(inode)->ip_flags |= OCFS2_INODE_DELETED;
1098 
1099 bail_unlock_inode:
1100 	ocfs2_inode_unlock(inode, 1);
1101 	brelse(di_bh);
1102 
1103 bail_unlock_nfs_sync:
1104 	ocfs2_nfs_sync_unlock(OCFS2_SB(inode->i_sb), 0);
1105 
1106 bail_unblock:
1107 	ocfs2_unblock_signals(&oldset);
1108 bail:
1109 	return;
1110 }
1111 
1112 static void ocfs2_clear_inode(struct inode *inode)
1113 {
1114 	int status;
1115 	struct ocfs2_inode_info *oi = OCFS2_I(inode);
1116 	struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1117 
1118 	clear_inode(inode);
1119 	trace_ocfs2_clear_inode((unsigned long long)oi->ip_blkno,
1120 				inode->i_nlink);
1121 
1122 	mlog_bug_on_msg(osb == NULL,
1123 			"Inode=%lu\n", inode->i_ino);
1124 
1125 	dquot_drop(inode);
1126 
1127 	/* To preven remote deletes we hold open lock before, now it
1128 	 * is time to unlock PR and EX open locks. */
1129 	ocfs2_open_unlock(inode);
1130 
1131 	/* Do these before all the other work so that we don't bounce
1132 	 * the downconvert thread while waiting to destroy the locks. */
1133 	ocfs2_mark_lockres_freeing(osb, &oi->ip_rw_lockres);
1134 	ocfs2_mark_lockres_freeing(osb, &oi->ip_inode_lockres);
1135 	ocfs2_mark_lockres_freeing(osb, &oi->ip_open_lockres);
1136 
1137 	ocfs2_resv_discard(&osb->osb_la_resmap,
1138 			   &oi->ip_la_data_resv);
1139 	ocfs2_resv_init_once(&oi->ip_la_data_resv);
1140 
1141 	/* We very well may get a clear_inode before all an inodes
1142 	 * metadata has hit disk. Of course, we can't drop any cluster
1143 	 * locks until the journal has finished with it. The only
1144 	 * exception here are successfully wiped inodes - their
1145 	 * metadata can now be considered to be part of the system
1146 	 * inodes from which it came. */
1147 	if (!(oi->ip_flags & OCFS2_INODE_DELETED))
1148 		ocfs2_checkpoint_inode(inode);
1149 
1150 	mlog_bug_on_msg(!list_empty(&oi->ip_io_markers),
1151 			"Clear inode of %llu, inode has io markers\n",
1152 			(unsigned long long)oi->ip_blkno);
1153 	mlog_bug_on_msg(!list_empty(&oi->ip_unwritten_list),
1154 			"Clear inode of %llu, inode has unwritten extents\n",
1155 			(unsigned long long)oi->ip_blkno);
1156 
1157 	ocfs2_extent_map_trunc(inode, 0);
1158 
1159 	status = ocfs2_drop_inode_locks(inode);
1160 	if (status < 0)
1161 		mlog_errno(status);
1162 
1163 	ocfs2_lock_res_free(&oi->ip_rw_lockres);
1164 	ocfs2_lock_res_free(&oi->ip_inode_lockres);
1165 	ocfs2_lock_res_free(&oi->ip_open_lockres);
1166 
1167 	ocfs2_metadata_cache_exit(INODE_CACHE(inode));
1168 
1169 	mlog_bug_on_msg(INODE_CACHE(inode)->ci_num_cached,
1170 			"Clear inode of %llu, inode has %u cache items\n",
1171 			(unsigned long long)oi->ip_blkno,
1172 			INODE_CACHE(inode)->ci_num_cached);
1173 
1174 	mlog_bug_on_msg(!(INODE_CACHE(inode)->ci_flags & OCFS2_CACHE_FL_INLINE),
1175 			"Clear inode of %llu, inode has a bad flag\n",
1176 			(unsigned long long)oi->ip_blkno);
1177 
1178 	mlog_bug_on_msg(spin_is_locked(&oi->ip_lock),
1179 			"Clear inode of %llu, inode is locked\n",
1180 			(unsigned long long)oi->ip_blkno);
1181 
1182 	mlog_bug_on_msg(!mutex_trylock(&oi->ip_io_mutex),
1183 			"Clear inode of %llu, io_mutex is locked\n",
1184 			(unsigned long long)oi->ip_blkno);
1185 	mutex_unlock(&oi->ip_io_mutex);
1186 
1187 	/*
1188 	 * down_trylock() returns 0, down_write_trylock() returns 1
1189 	 * kernel 1, world 0
1190 	 */
1191 	mlog_bug_on_msg(!down_write_trylock(&oi->ip_alloc_sem),
1192 			"Clear inode of %llu, alloc_sem is locked\n",
1193 			(unsigned long long)oi->ip_blkno);
1194 	up_write(&oi->ip_alloc_sem);
1195 
1196 	mlog_bug_on_msg(oi->ip_open_count,
1197 			"Clear inode of %llu has open count %d\n",
1198 			(unsigned long long)oi->ip_blkno, oi->ip_open_count);
1199 
1200 	/* Clear all other flags. */
1201 	oi->ip_flags = 0;
1202 	oi->ip_dir_start_lookup = 0;
1203 	oi->ip_blkno = 0ULL;
1204 
1205 	/*
1206 	 * ip_jinode is used to track txns against this inode. We ensure that
1207 	 * the journal is flushed before journal shutdown. Thus it is safe to
1208 	 * have inodes get cleaned up after journal shutdown.
1209 	 */
1210 	jbd2_journal_release_jbd_inode(osb->journal->j_journal,
1211 				       &oi->ip_jinode);
1212 }
1213 
1214 void ocfs2_evict_inode(struct inode *inode)
1215 {
1216 	if (!inode->i_nlink ||
1217 	    (OCFS2_I(inode)->ip_flags & OCFS2_INODE_MAYBE_ORPHANED)) {
1218 		ocfs2_delete_inode(inode);
1219 	} else {
1220 		truncate_inode_pages_final(&inode->i_data);
1221 	}
1222 	ocfs2_clear_inode(inode);
1223 }
1224 
1225 /* Called under inode_lock, with no more references on the
1226  * struct inode, so it's safe here to check the flags field
1227  * and to manipulate i_nlink without any other locks. */
1228 int ocfs2_drop_inode(struct inode *inode)
1229 {
1230 	struct ocfs2_inode_info *oi = OCFS2_I(inode);
1231 
1232 	trace_ocfs2_drop_inode((unsigned long long)oi->ip_blkno,
1233 				inode->i_nlink, oi->ip_flags);
1234 
1235 	assert_spin_locked(&inode->i_lock);
1236 	inode->i_state |= I_WILL_FREE;
1237 	spin_unlock(&inode->i_lock);
1238 	write_inode_now(inode, 1);
1239 	spin_lock(&inode->i_lock);
1240 	WARN_ON(inode->i_state & I_NEW);
1241 	inode->i_state &= ~I_WILL_FREE;
1242 
1243 	return 1;
1244 }
1245 
1246 /*
1247  * This is called from our getattr.
1248  */
1249 int ocfs2_inode_revalidate(struct dentry *dentry)
1250 {
1251 	struct inode *inode = d_inode(dentry);
1252 	int status = 0;
1253 
1254 	trace_ocfs2_inode_revalidate(inode,
1255 		inode ? (unsigned long long)OCFS2_I(inode)->ip_blkno : 0ULL,
1256 		inode ? (unsigned long long)OCFS2_I(inode)->ip_flags : 0);
1257 
1258 	if (!inode) {
1259 		status = -ENOENT;
1260 		goto bail;
1261 	}
1262 
1263 	spin_lock(&OCFS2_I(inode)->ip_lock);
1264 	if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED) {
1265 		spin_unlock(&OCFS2_I(inode)->ip_lock);
1266 		status = -ENOENT;
1267 		goto bail;
1268 	}
1269 	spin_unlock(&OCFS2_I(inode)->ip_lock);
1270 
1271 	/* Let ocfs2_inode_lock do the work of updating our struct
1272 	 * inode for us. */
1273 	status = ocfs2_inode_lock(inode, NULL, 0);
1274 	if (status < 0) {
1275 		if (status != -ENOENT)
1276 			mlog_errno(status);
1277 		goto bail;
1278 	}
1279 	ocfs2_inode_unlock(inode, 0);
1280 bail:
1281 	return status;
1282 }
1283 
1284 /*
1285  * Updates a disk inode from a
1286  * struct inode.
1287  * Only takes ip_lock.
1288  */
1289 int ocfs2_mark_inode_dirty(handle_t *handle,
1290 			   struct inode *inode,
1291 			   struct buffer_head *bh)
1292 {
1293 	int status;
1294 	struct ocfs2_dinode *fe = (struct ocfs2_dinode *) bh->b_data;
1295 
1296 	trace_ocfs2_mark_inode_dirty((unsigned long long)OCFS2_I(inode)->ip_blkno);
1297 
1298 	status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
1299 					 OCFS2_JOURNAL_ACCESS_WRITE);
1300 	if (status < 0) {
1301 		mlog_errno(status);
1302 		goto leave;
1303 	}
1304 
1305 	spin_lock(&OCFS2_I(inode)->ip_lock);
1306 	fe->i_clusters = cpu_to_le32(OCFS2_I(inode)->ip_clusters);
1307 	ocfs2_get_inode_flags(OCFS2_I(inode));
1308 	fe->i_attr = cpu_to_le32(OCFS2_I(inode)->ip_attr);
1309 	fe->i_dyn_features = cpu_to_le16(OCFS2_I(inode)->ip_dyn_features);
1310 	spin_unlock(&OCFS2_I(inode)->ip_lock);
1311 
1312 	fe->i_size = cpu_to_le64(i_size_read(inode));
1313 	ocfs2_set_links_count(fe, inode->i_nlink);
1314 	fe->i_uid = cpu_to_le32(i_uid_read(inode));
1315 	fe->i_gid = cpu_to_le32(i_gid_read(inode));
1316 	fe->i_mode = cpu_to_le16(inode->i_mode);
1317 	fe->i_atime = cpu_to_le64(inode->i_atime.tv_sec);
1318 	fe->i_atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec);
1319 	fe->i_ctime = cpu_to_le64(inode->i_ctime.tv_sec);
1320 	fe->i_ctime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
1321 	fe->i_mtime = cpu_to_le64(inode->i_mtime.tv_sec);
1322 	fe->i_mtime_nsec = cpu_to_le32(inode->i_mtime.tv_nsec);
1323 
1324 	ocfs2_journal_dirty(handle, bh);
1325 	ocfs2_update_inode_fsync_trans(handle, inode, 1);
1326 leave:
1327 	return status;
1328 }
1329 
1330 /*
1331  *
1332  * Updates a struct inode from a disk inode.
1333  * does no i/o, only takes ip_lock.
1334  */
1335 void ocfs2_refresh_inode(struct inode *inode,
1336 			 struct ocfs2_dinode *fe)
1337 {
1338 	spin_lock(&OCFS2_I(inode)->ip_lock);
1339 
1340 	OCFS2_I(inode)->ip_clusters = le32_to_cpu(fe->i_clusters);
1341 	OCFS2_I(inode)->ip_attr = le32_to_cpu(fe->i_attr);
1342 	OCFS2_I(inode)->ip_dyn_features = le16_to_cpu(fe->i_dyn_features);
1343 	ocfs2_set_inode_flags(inode);
1344 	i_size_write(inode, le64_to_cpu(fe->i_size));
1345 	set_nlink(inode, ocfs2_read_links_count(fe));
1346 	i_uid_write(inode, le32_to_cpu(fe->i_uid));
1347 	i_gid_write(inode, le32_to_cpu(fe->i_gid));
1348 	inode->i_mode = le16_to_cpu(fe->i_mode);
1349 	if (S_ISLNK(inode->i_mode) && le32_to_cpu(fe->i_clusters) == 0)
1350 		inode->i_blocks = 0;
1351 	else
1352 		inode->i_blocks = ocfs2_inode_sector_count(inode);
1353 	inode->i_atime.tv_sec = le64_to_cpu(fe->i_atime);
1354 	inode->i_atime.tv_nsec = le32_to_cpu(fe->i_atime_nsec);
1355 	inode->i_mtime.tv_sec = le64_to_cpu(fe->i_mtime);
1356 	inode->i_mtime.tv_nsec = le32_to_cpu(fe->i_mtime_nsec);
1357 	inode->i_ctime.tv_sec = le64_to_cpu(fe->i_ctime);
1358 	inode->i_ctime.tv_nsec = le32_to_cpu(fe->i_ctime_nsec);
1359 
1360 	spin_unlock(&OCFS2_I(inode)->ip_lock);
1361 }
1362 
1363 int ocfs2_validate_inode_block(struct super_block *sb,
1364 			       struct buffer_head *bh)
1365 {
1366 	int rc;
1367 	struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
1368 
1369 	trace_ocfs2_validate_inode_block((unsigned long long)bh->b_blocknr);
1370 
1371 	BUG_ON(!buffer_uptodate(bh));
1372 
1373 	/*
1374 	 * If the ecc fails, we return the error but otherwise
1375 	 * leave the filesystem running.  We know any error is
1376 	 * local to this block.
1377 	 */
1378 	rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &di->i_check);
1379 	if (rc) {
1380 		mlog(ML_ERROR, "Checksum failed for dinode %llu\n",
1381 		     (unsigned long long)bh->b_blocknr);
1382 		goto bail;
1383 	}
1384 
1385 	/*
1386 	 * Errors after here are fatal.
1387 	 */
1388 
1389 	rc = -EINVAL;
1390 
1391 	if (!OCFS2_IS_VALID_DINODE(di)) {
1392 		rc = ocfs2_error(sb, "Invalid dinode #%llu: signature = %.*s\n",
1393 				 (unsigned long long)bh->b_blocknr, 7,
1394 				 di->i_signature);
1395 		goto bail;
1396 	}
1397 
1398 	if (le64_to_cpu(di->i_blkno) != bh->b_blocknr) {
1399 		rc = ocfs2_error(sb, "Invalid dinode #%llu: i_blkno is %llu\n",
1400 				 (unsigned long long)bh->b_blocknr,
1401 				 (unsigned long long)le64_to_cpu(di->i_blkno));
1402 		goto bail;
1403 	}
1404 
1405 	if (!(di->i_flags & cpu_to_le32(OCFS2_VALID_FL))) {
1406 		rc = ocfs2_error(sb,
1407 				 "Invalid dinode #%llu: OCFS2_VALID_FL not set\n",
1408 				 (unsigned long long)bh->b_blocknr);
1409 		goto bail;
1410 	}
1411 
1412 	if (le32_to_cpu(di->i_fs_generation) !=
1413 	    OCFS2_SB(sb)->fs_generation) {
1414 		rc = ocfs2_error(sb,
1415 				 "Invalid dinode #%llu: fs_generation is %u\n",
1416 				 (unsigned long long)bh->b_blocknr,
1417 				 le32_to_cpu(di->i_fs_generation));
1418 		goto bail;
1419 	}
1420 
1421 	rc = 0;
1422 
1423 bail:
1424 	return rc;
1425 }
1426 
1427 static int ocfs2_filecheck_validate_inode_block(struct super_block *sb,
1428 						struct buffer_head *bh)
1429 {
1430 	int rc = 0;
1431 	struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
1432 
1433 	trace_ocfs2_filecheck_validate_inode_block(
1434 		(unsigned long long)bh->b_blocknr);
1435 
1436 	BUG_ON(!buffer_uptodate(bh));
1437 
1438 	/*
1439 	 * Call ocfs2_validate_meta_ecc() first since it has ecc repair
1440 	 * function, but we should not return error immediately when ecc
1441 	 * validation fails, because the reason is quite likely the invalid
1442 	 * inode number inputed.
1443 	 */
1444 	rc = ocfs2_validate_meta_ecc(sb, bh->b_data, &di->i_check);
1445 	if (rc) {
1446 		mlog(ML_ERROR,
1447 		     "Filecheck: checksum failed for dinode %llu\n",
1448 		     (unsigned long long)bh->b_blocknr);
1449 		rc = -OCFS2_FILECHECK_ERR_BLOCKECC;
1450 	}
1451 
1452 	if (!OCFS2_IS_VALID_DINODE(di)) {
1453 		mlog(ML_ERROR,
1454 		     "Filecheck: invalid dinode #%llu: signature = %.*s\n",
1455 		     (unsigned long long)bh->b_blocknr, 7, di->i_signature);
1456 		rc = -OCFS2_FILECHECK_ERR_INVALIDINO;
1457 		goto bail;
1458 	} else if (rc)
1459 		goto bail;
1460 
1461 	if (le64_to_cpu(di->i_blkno) != bh->b_blocknr) {
1462 		mlog(ML_ERROR,
1463 		     "Filecheck: invalid dinode #%llu: i_blkno is %llu\n",
1464 		     (unsigned long long)bh->b_blocknr,
1465 		     (unsigned long long)le64_to_cpu(di->i_blkno));
1466 		rc = -OCFS2_FILECHECK_ERR_BLOCKNO;
1467 		goto bail;
1468 	}
1469 
1470 	if (!(di->i_flags & cpu_to_le32(OCFS2_VALID_FL))) {
1471 		mlog(ML_ERROR,
1472 		     "Filecheck: invalid dinode #%llu: OCFS2_VALID_FL "
1473 		     "not set\n",
1474 		     (unsigned long long)bh->b_blocknr);
1475 		rc = -OCFS2_FILECHECK_ERR_VALIDFLAG;
1476 		goto bail;
1477 	}
1478 
1479 	if (le32_to_cpu(di->i_fs_generation) !=
1480 	    OCFS2_SB(sb)->fs_generation) {
1481 		mlog(ML_ERROR,
1482 		     "Filecheck: invalid dinode #%llu: fs_generation is %u\n",
1483 		     (unsigned long long)bh->b_blocknr,
1484 		     le32_to_cpu(di->i_fs_generation));
1485 		rc = -OCFS2_FILECHECK_ERR_GENERATION;
1486 	}
1487 
1488 bail:
1489 	return rc;
1490 }
1491 
1492 static int ocfs2_filecheck_repair_inode_block(struct super_block *sb,
1493 					      struct buffer_head *bh)
1494 {
1495 	int changed = 0;
1496 	struct ocfs2_dinode *di = (struct ocfs2_dinode *)bh->b_data;
1497 
1498 	if (!ocfs2_filecheck_validate_inode_block(sb, bh))
1499 		return 0;
1500 
1501 	trace_ocfs2_filecheck_repair_inode_block(
1502 		(unsigned long long)bh->b_blocknr);
1503 
1504 	if (ocfs2_is_hard_readonly(OCFS2_SB(sb)) ||
1505 	    ocfs2_is_soft_readonly(OCFS2_SB(sb))) {
1506 		mlog(ML_ERROR,
1507 		     "Filecheck: cannot repair dinode #%llu "
1508 		     "on readonly filesystem\n",
1509 		     (unsigned long long)bh->b_blocknr);
1510 		return -OCFS2_FILECHECK_ERR_READONLY;
1511 	}
1512 
1513 	if (buffer_jbd(bh)) {
1514 		mlog(ML_ERROR,
1515 		     "Filecheck: cannot repair dinode #%llu, "
1516 		     "its buffer is in jbd\n",
1517 		     (unsigned long long)bh->b_blocknr);
1518 		return -OCFS2_FILECHECK_ERR_INJBD;
1519 	}
1520 
1521 	if (!OCFS2_IS_VALID_DINODE(di)) {
1522 		/* Cannot fix invalid inode block */
1523 		return -OCFS2_FILECHECK_ERR_INVALIDINO;
1524 	}
1525 
1526 	if (!(di->i_flags & cpu_to_le32(OCFS2_VALID_FL))) {
1527 		/* Cannot just add VALID_FL flag back as a fix,
1528 		 * need more things to check here.
1529 		 */
1530 		return -OCFS2_FILECHECK_ERR_VALIDFLAG;
1531 	}
1532 
1533 	if (le64_to_cpu(di->i_blkno) != bh->b_blocknr) {
1534 		di->i_blkno = cpu_to_le64(bh->b_blocknr);
1535 		changed = 1;
1536 		mlog(ML_ERROR,
1537 		     "Filecheck: reset dinode #%llu: i_blkno to %llu\n",
1538 		     (unsigned long long)bh->b_blocknr,
1539 		     (unsigned long long)le64_to_cpu(di->i_blkno));
1540 	}
1541 
1542 	if (le32_to_cpu(di->i_fs_generation) !=
1543 	    OCFS2_SB(sb)->fs_generation) {
1544 		di->i_fs_generation = cpu_to_le32(OCFS2_SB(sb)->fs_generation);
1545 		changed = 1;
1546 		mlog(ML_ERROR,
1547 		     "Filecheck: reset dinode #%llu: fs_generation to %u\n",
1548 		     (unsigned long long)bh->b_blocknr,
1549 		     le32_to_cpu(di->i_fs_generation));
1550 	}
1551 
1552 	if (changed || ocfs2_validate_meta_ecc(sb, bh->b_data, &di->i_check)) {
1553 		ocfs2_compute_meta_ecc(sb, bh->b_data, &di->i_check);
1554 		mark_buffer_dirty(bh);
1555 		mlog(ML_ERROR,
1556 		     "Filecheck: reset dinode #%llu: compute meta ecc\n",
1557 		     (unsigned long long)bh->b_blocknr);
1558 	}
1559 
1560 	return 0;
1561 }
1562 
1563 static int
1564 ocfs2_filecheck_read_inode_block_full(struct inode *inode,
1565 				      struct buffer_head **bh,
1566 				      int flags, int type)
1567 {
1568 	int rc;
1569 	struct buffer_head *tmp = *bh;
1570 
1571 	if (!type) /* Check inode block */
1572 		rc = ocfs2_read_blocks(INODE_CACHE(inode),
1573 				OCFS2_I(inode)->ip_blkno,
1574 				1, &tmp, flags,
1575 				ocfs2_filecheck_validate_inode_block);
1576 	else /* Repair inode block */
1577 		rc = ocfs2_read_blocks(INODE_CACHE(inode),
1578 				OCFS2_I(inode)->ip_blkno,
1579 				1, &tmp, flags,
1580 				ocfs2_filecheck_repair_inode_block);
1581 
1582 	/* If ocfs2_read_blocks() got us a new bh, pass it up. */
1583 	if (!rc && !*bh)
1584 		*bh = tmp;
1585 
1586 	return rc;
1587 }
1588 
1589 int ocfs2_read_inode_block_full(struct inode *inode, struct buffer_head **bh,
1590 				int flags)
1591 {
1592 	int rc;
1593 	struct buffer_head *tmp = *bh;
1594 
1595 	rc = ocfs2_read_blocks(INODE_CACHE(inode), OCFS2_I(inode)->ip_blkno,
1596 			       1, &tmp, flags, ocfs2_validate_inode_block);
1597 
1598 	/* If ocfs2_read_blocks() got us a new bh, pass it up. */
1599 	if (!rc && !*bh)
1600 		*bh = tmp;
1601 
1602 	return rc;
1603 }
1604 
1605 int ocfs2_read_inode_block(struct inode *inode, struct buffer_head **bh)
1606 {
1607 	return ocfs2_read_inode_block_full(inode, bh, 0);
1608 }
1609 
1610 
1611 static u64 ocfs2_inode_cache_owner(struct ocfs2_caching_info *ci)
1612 {
1613 	struct ocfs2_inode_info *oi = cache_info_to_inode(ci);
1614 
1615 	return oi->ip_blkno;
1616 }
1617 
1618 static struct super_block *ocfs2_inode_cache_get_super(struct ocfs2_caching_info *ci)
1619 {
1620 	struct ocfs2_inode_info *oi = cache_info_to_inode(ci);
1621 
1622 	return oi->vfs_inode.i_sb;
1623 }
1624 
1625 static void ocfs2_inode_cache_lock(struct ocfs2_caching_info *ci)
1626 {
1627 	struct ocfs2_inode_info *oi = cache_info_to_inode(ci);
1628 
1629 	spin_lock(&oi->ip_lock);
1630 }
1631 
1632 static void ocfs2_inode_cache_unlock(struct ocfs2_caching_info *ci)
1633 {
1634 	struct ocfs2_inode_info *oi = cache_info_to_inode(ci);
1635 
1636 	spin_unlock(&oi->ip_lock);
1637 }
1638 
1639 static void ocfs2_inode_cache_io_lock(struct ocfs2_caching_info *ci)
1640 {
1641 	struct ocfs2_inode_info *oi = cache_info_to_inode(ci);
1642 
1643 	mutex_lock(&oi->ip_io_mutex);
1644 }
1645 
1646 static void ocfs2_inode_cache_io_unlock(struct ocfs2_caching_info *ci)
1647 {
1648 	struct ocfs2_inode_info *oi = cache_info_to_inode(ci);
1649 
1650 	mutex_unlock(&oi->ip_io_mutex);
1651 }
1652 
1653 const struct ocfs2_caching_operations ocfs2_inode_caching_ops = {
1654 	.co_owner		= ocfs2_inode_cache_owner,
1655 	.co_get_super		= ocfs2_inode_cache_get_super,
1656 	.co_cache_lock		= ocfs2_inode_cache_lock,
1657 	.co_cache_unlock	= ocfs2_inode_cache_unlock,
1658 	.co_io_lock		= ocfs2_inode_cache_io_lock,
1659 	.co_io_unlock		= ocfs2_inode_cache_io_unlock,
1660 };
1661 
1662