1 // SPDX-License-Identifier: GPL-2.0-only
2 /*
3  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
4  * Copyright (C) 2004-2008 Red Hat, Inc.  All rights reserved.
5  */
6 
7 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
8 
9 #include <linux/sched.h>
10 #include <linux/slab.h>
11 #include <linux/spinlock.h>
12 #include <linux/completion.h>
13 #include <linux/buffer_head.h>
14 #include <linux/blkdev.h>
15 #include <linux/kthread.h>
16 #include <linux/export.h>
17 #include <linux/namei.h>
18 #include <linux/mount.h>
19 #include <linux/gfs2_ondisk.h>
20 #include <linux/quotaops.h>
21 #include <linux/lockdep.h>
22 #include <linux/module.h>
23 #include <linux/backing-dev.h>
24 #include <linux/fs_parser.h>
25 
26 #include "gfs2.h"
27 #include "incore.h"
28 #include "bmap.h"
29 #include "glock.h"
30 #include "glops.h"
31 #include "inode.h"
32 #include "recovery.h"
33 #include "rgrp.h"
34 #include "super.h"
35 #include "sys.h"
36 #include "util.h"
37 #include "log.h"
38 #include "quota.h"
39 #include "dir.h"
40 #include "meta_io.h"
41 #include "trace_gfs2.h"
42 #include "lops.h"
43 
44 #define DO 0
45 #define UNDO 1
46 
47 /**
48  * gfs2_tune_init - Fill a gfs2_tune structure with default values
49  * @gt: tune
50  *
51  */
52 
gfs2_tune_init(struct gfs2_tune * gt)53 static void gfs2_tune_init(struct gfs2_tune *gt)
54 {
55 	spin_lock_init(&gt->gt_spin);
56 
57 	gt->gt_quota_warn_period = 10;
58 	gt->gt_quota_scale_num = 1;
59 	gt->gt_quota_scale_den = 1;
60 	gt->gt_new_files_jdata = 0;
61 	gt->gt_max_readahead = BIT(18);
62 	gt->gt_complain_secs = 10;
63 }
64 
free_sbd(struct gfs2_sbd * sdp)65 void free_sbd(struct gfs2_sbd *sdp)
66 {
67 	if (sdp->sd_lkstats)
68 		free_percpu(sdp->sd_lkstats);
69 	kfree(sdp);
70 }
71 
init_sbd(struct super_block * sb)72 static struct gfs2_sbd *init_sbd(struct super_block *sb)
73 {
74 	struct gfs2_sbd *sdp;
75 	struct address_space *mapping;
76 
77 	sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL);
78 	if (!sdp)
79 		return NULL;
80 
81 	sdp->sd_vfs = sb;
82 	sdp->sd_lkstats = alloc_percpu(struct gfs2_pcpu_lkstats);
83 	if (!sdp->sd_lkstats)
84 		goto fail;
85 	sb->s_fs_info = sdp;
86 
87 	set_bit(SDF_NOJOURNALID, &sdp->sd_flags);
88 	gfs2_tune_init(&sdp->sd_tune);
89 
90 	init_waitqueue_head(&sdp->sd_kill_wait);
91 	init_waitqueue_head(&sdp->sd_async_glock_wait);
92 	atomic_set(&sdp->sd_glock_disposal, 0);
93 	init_completion(&sdp->sd_locking_init);
94 	init_completion(&sdp->sd_wdack);
95 	spin_lock_init(&sdp->sd_statfs_spin);
96 
97 	spin_lock_init(&sdp->sd_rindex_spin);
98 	sdp->sd_rindex_tree.rb_node = NULL;
99 
100 	INIT_LIST_HEAD(&sdp->sd_jindex_list);
101 	spin_lock_init(&sdp->sd_jindex_spin);
102 	mutex_init(&sdp->sd_jindex_mutex);
103 	init_completion(&sdp->sd_journal_ready);
104 
105 	INIT_LIST_HEAD(&sdp->sd_quota_list);
106 	mutex_init(&sdp->sd_quota_mutex);
107 	mutex_init(&sdp->sd_quota_sync_mutex);
108 	init_waitqueue_head(&sdp->sd_quota_wait);
109 	spin_lock_init(&sdp->sd_bitmap_lock);
110 
111 	INIT_LIST_HEAD(&sdp->sd_sc_inodes_list);
112 
113 	mapping = &sdp->sd_aspace;
114 
115 	address_space_init_once(mapping);
116 	mapping->a_ops = &gfs2_rgrp_aops;
117 	mapping->host = sb->s_bdev->bd_inode;
118 	mapping->flags = 0;
119 	mapping_set_gfp_mask(mapping, GFP_NOFS);
120 	mapping->i_private_data = NULL;
121 	mapping->writeback_index = 0;
122 
123 	spin_lock_init(&sdp->sd_log_lock);
124 	atomic_set(&sdp->sd_log_pinned, 0);
125 	INIT_LIST_HEAD(&sdp->sd_log_revokes);
126 	INIT_LIST_HEAD(&sdp->sd_log_ordered);
127 	spin_lock_init(&sdp->sd_ordered_lock);
128 
129 	init_waitqueue_head(&sdp->sd_log_waitq);
130 	init_waitqueue_head(&sdp->sd_logd_waitq);
131 	spin_lock_init(&sdp->sd_ail_lock);
132 	INIT_LIST_HEAD(&sdp->sd_ail1_list);
133 	INIT_LIST_HEAD(&sdp->sd_ail2_list);
134 
135 	init_rwsem(&sdp->sd_log_flush_lock);
136 	atomic_set(&sdp->sd_log_in_flight, 0);
137 	init_waitqueue_head(&sdp->sd_log_flush_wait);
138 	mutex_init(&sdp->sd_freeze_mutex);
139 
140 	return sdp;
141 
142 fail:
143 	free_sbd(sdp);
144 	return NULL;
145 }
146 
147 /**
148  * gfs2_check_sb - Check superblock
149  * @sdp: the filesystem
150  * @silent: Don't print a message if the check fails
151  *
152  * Checks the version code of the FS is one that we understand how to
153  * read and that the sizes of the various on-disk structures have not
154  * changed.
155  */
156 
gfs2_check_sb(struct gfs2_sbd * sdp,int silent)157 static int gfs2_check_sb(struct gfs2_sbd *sdp, int silent)
158 {
159 	struct gfs2_sb_host *sb = &sdp->sd_sb;
160 
161 	if (sb->sb_magic != GFS2_MAGIC ||
162 	    sb->sb_type != GFS2_METATYPE_SB) {
163 		if (!silent)
164 			pr_warn("not a GFS2 filesystem\n");
165 		return -EINVAL;
166 	}
167 
168 	if (sb->sb_fs_format < GFS2_FS_FORMAT_MIN ||
169 	    sb->sb_fs_format > GFS2_FS_FORMAT_MAX ||
170 	    sb->sb_multihost_format != GFS2_FORMAT_MULTI) {
171 		fs_warn(sdp, "Unknown on-disk format, unable to mount\n");
172 		return -EINVAL;
173 	}
174 
175 	if (sb->sb_bsize < 512 || sb->sb_bsize > PAGE_SIZE ||
176 	    (sb->sb_bsize & (sb->sb_bsize - 1))) {
177 		pr_warn("Invalid block size\n");
178 		return -EINVAL;
179 	}
180 	if (sb->sb_bsize_shift != ffs(sb->sb_bsize) - 1) {
181 		pr_warn("Invalid block size shift\n");
182 		return -EINVAL;
183 	}
184 	return 0;
185 }
186 
end_bio_io_page(struct bio * bio)187 static void end_bio_io_page(struct bio *bio)
188 {
189 	struct page *page = bio->bi_private;
190 
191 	if (!bio->bi_status)
192 		SetPageUptodate(page);
193 	else
194 		pr_warn("error %d reading superblock\n", bio->bi_status);
195 	unlock_page(page);
196 }
197 
gfs2_sb_in(struct gfs2_sbd * sdp,const void * buf)198 static void gfs2_sb_in(struct gfs2_sbd *sdp, const void *buf)
199 {
200 	struct gfs2_sb_host *sb = &sdp->sd_sb;
201 	struct super_block *s = sdp->sd_vfs;
202 	const struct gfs2_sb *str = buf;
203 
204 	sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic);
205 	sb->sb_type = be32_to_cpu(str->sb_header.mh_type);
206 	sb->sb_fs_format = be32_to_cpu(str->sb_fs_format);
207 	sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format);
208 	sb->sb_bsize = be32_to_cpu(str->sb_bsize);
209 	sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift);
210 	sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr);
211 	sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino);
212 	sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr);
213 	sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino);
214 
215 	memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN);
216 	memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN);
217 	memcpy(&s->s_uuid, str->sb_uuid, 16);
218 }
219 
220 /**
221  * gfs2_read_super - Read the gfs2 super block from disk
222  * @sdp: The GFS2 super block
223  * @sector: The location of the super block
224  * @silent: Don't print a message if the check fails
225  *
226  * This uses the bio functions to read the super block from disk
227  * because we want to be 100% sure that we never read cached data.
228  * A super block is read twice only during each GFS2 mount and is
229  * never written to by the filesystem. The first time its read no
230  * locks are held, and the only details which are looked at are those
231  * relating to the locking protocol. Once locking is up and working,
232  * the sb is read again under the lock to establish the location of
233  * the master directory (contains pointers to journals etc) and the
234  * root directory.
235  *
236  * Returns: 0 on success or error
237  */
238 
gfs2_read_super(struct gfs2_sbd * sdp,sector_t sector,int silent)239 static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector, int silent)
240 {
241 	struct super_block *sb = sdp->sd_vfs;
242 	struct gfs2_sb *p;
243 	struct page *page;
244 	struct bio *bio;
245 
246 	page = alloc_page(GFP_NOFS);
247 	if (unlikely(!page))
248 		return -ENOMEM;
249 
250 	ClearPageUptodate(page);
251 	ClearPageDirty(page);
252 	lock_page(page);
253 
254 	bio = bio_alloc(sb->s_bdev, 1, REQ_OP_READ | REQ_META, GFP_NOFS);
255 	bio->bi_iter.bi_sector = sector * (sb->s_blocksize >> 9);
256 	__bio_add_page(bio, page, PAGE_SIZE, 0);
257 
258 	bio->bi_end_io = end_bio_io_page;
259 	bio->bi_private = page;
260 	submit_bio(bio);
261 	wait_on_page_locked(page);
262 	bio_put(bio);
263 	if (!PageUptodate(page)) {
264 		__free_page(page);
265 		return -EIO;
266 	}
267 	p = kmap(page);
268 	gfs2_sb_in(sdp, p);
269 	kunmap(page);
270 	__free_page(page);
271 	return gfs2_check_sb(sdp, silent);
272 }
273 
274 /**
275  * gfs2_read_sb - Read super block
276  * @sdp: The GFS2 superblock
277  * @silent: Don't print message if mount fails
278  *
279  */
280 
gfs2_read_sb(struct gfs2_sbd * sdp,int silent)281 static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent)
282 {
283 	u32 hash_blocks, ind_blocks, leaf_blocks;
284 	u32 tmp_blocks;
285 	unsigned int x;
286 	int error;
287 
288 	error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
289 	if (error) {
290 		if (!silent)
291 			fs_err(sdp, "can't read superblock\n");
292 		return error;
293 	}
294 
295 	sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift - 9;
296 	sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift);
297 	sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
298 			  sizeof(struct gfs2_dinode)) / sizeof(u64);
299 	sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
300 			  sizeof(struct gfs2_meta_header)) / sizeof(u64);
301 	sdp->sd_ldptrs = (sdp->sd_sb.sb_bsize -
302 			  sizeof(struct gfs2_log_descriptor)) / sizeof(u64);
303 	sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
304 	sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
305 	sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
306 	sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64);
307 	sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
308 				sizeof(struct gfs2_meta_header)) /
309 			        sizeof(struct gfs2_quota_change);
310 	sdp->sd_blocks_per_bitmap = (sdp->sd_sb.sb_bsize -
311 				     sizeof(struct gfs2_meta_header))
312 		* GFS2_NBBY; /* not the rgrp bitmap, subsequent bitmaps only */
313 
314 	/*
315 	 * We always keep at least one block reserved for revokes in
316 	 * transactions.  This greatly simplifies allocating additional
317 	 * revoke blocks.
318 	 */
319 	atomic_set(&sdp->sd_log_revokes_available, sdp->sd_ldptrs);
320 
321 	/* Compute maximum reservation required to add a entry to a directory */
322 
323 	hash_blocks = DIV_ROUND_UP(sizeof(u64) * BIT(GFS2_DIR_MAX_DEPTH),
324 			     sdp->sd_jbsize);
325 
326 	ind_blocks = 0;
327 	for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
328 		tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
329 		ind_blocks += tmp_blocks;
330 	}
331 
332 	leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
333 
334 	sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
335 
336 	sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
337 				sizeof(struct gfs2_dinode);
338 	sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
339 	for (x = 2;; x++) {
340 		u64 space, d;
341 		u32 m;
342 
343 		space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
344 		d = space;
345 		m = do_div(d, sdp->sd_inptrs);
346 
347 		if (d != sdp->sd_heightsize[x - 1] || m)
348 			break;
349 		sdp->sd_heightsize[x] = space;
350 	}
351 	sdp->sd_max_height = x;
352 	sdp->sd_heightsize[x] = ~0;
353 	gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
354 
355 	sdp->sd_max_dents_per_leaf = (sdp->sd_sb.sb_bsize -
356 				      sizeof(struct gfs2_leaf)) /
357 				     GFS2_MIN_DIRENT_SIZE;
358 	return 0;
359 }
360 
init_names(struct gfs2_sbd * sdp,int silent)361 static int init_names(struct gfs2_sbd *sdp, int silent)
362 {
363 	char *proto, *table;
364 	int error = 0;
365 
366 	proto = sdp->sd_args.ar_lockproto;
367 	table = sdp->sd_args.ar_locktable;
368 
369 	/*  Try to autodetect  */
370 
371 	if (!proto[0] || !table[0]) {
372 		error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
373 		if (error)
374 			return error;
375 
376 		if (!proto[0])
377 			proto = sdp->sd_sb.sb_lockproto;
378 		if (!table[0])
379 			table = sdp->sd_sb.sb_locktable;
380 	}
381 
382 	if (!table[0])
383 		table = sdp->sd_vfs->s_id;
384 
385 	BUILD_BUG_ON(GFS2_LOCKNAME_LEN > GFS2_FSNAME_LEN);
386 
387 	strscpy(sdp->sd_proto_name, proto, GFS2_LOCKNAME_LEN);
388 	strscpy(sdp->sd_table_name, table, GFS2_LOCKNAME_LEN);
389 
390 	table = sdp->sd_table_name;
391 	while ((table = strchr(table, '/')))
392 		*table = '_';
393 
394 	return error;
395 }
396 
init_locking(struct gfs2_sbd * sdp,struct gfs2_holder * mount_gh,int undo)397 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
398 			int undo)
399 {
400 	int error = 0;
401 
402 	if (undo)
403 		goto fail_trans;
404 
405 	error = gfs2_glock_nq_num(sdp,
406 				  GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
407 				  LM_ST_EXCLUSIVE,
408 				  LM_FLAG_NOEXP | GL_NOCACHE | GL_NOPID,
409 				  mount_gh);
410 	if (error) {
411 		fs_err(sdp, "can't acquire mount glock: %d\n", error);
412 		goto fail;
413 	}
414 
415 	error = gfs2_glock_nq_num(sdp,
416 				  GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
417 				  LM_ST_SHARED,
418 				  LM_FLAG_NOEXP | GL_EXACT | GL_NOPID,
419 				  &sdp->sd_live_gh);
420 	if (error) {
421 		fs_err(sdp, "can't acquire live glock: %d\n", error);
422 		goto fail_mount;
423 	}
424 
425 	error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
426 			       CREATE, &sdp->sd_rename_gl);
427 	if (error) {
428 		fs_err(sdp, "can't create rename glock: %d\n", error);
429 		goto fail_live;
430 	}
431 
432 	error = gfs2_glock_get(sdp, GFS2_FREEZE_LOCK, &gfs2_freeze_glops,
433 			       CREATE, &sdp->sd_freeze_gl);
434 	if (error) {
435 		fs_err(sdp, "can't create freeze glock: %d\n", error);
436 		goto fail_rename;
437 	}
438 
439 	return 0;
440 
441 fail_trans:
442 	gfs2_glock_put(sdp->sd_freeze_gl);
443 fail_rename:
444 	gfs2_glock_put(sdp->sd_rename_gl);
445 fail_live:
446 	gfs2_glock_dq_uninit(&sdp->sd_live_gh);
447 fail_mount:
448 	gfs2_glock_dq_uninit(mount_gh);
449 fail:
450 	return error;
451 }
452 
gfs2_lookup_root(struct super_block * sb,struct dentry ** dptr,u64 no_addr,const char * name)453 static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr,
454 			    u64 no_addr, const char *name)
455 {
456 	struct gfs2_sbd *sdp = sb->s_fs_info;
457 	struct dentry *dentry;
458 	struct inode *inode;
459 
460 	inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0,
461 				  GFS2_BLKST_FREE /* ignore */);
462 	if (IS_ERR(inode)) {
463 		fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode));
464 		return PTR_ERR(inode);
465 	}
466 	dentry = d_make_root(inode);
467 	if (!dentry) {
468 		fs_err(sdp, "can't alloc %s dentry\n", name);
469 		return -ENOMEM;
470 	}
471 	*dptr = dentry;
472 	return 0;
473 }
474 
init_sb(struct gfs2_sbd * sdp,int silent)475 static int init_sb(struct gfs2_sbd *sdp, int silent)
476 {
477 	struct super_block *sb = sdp->sd_vfs;
478 	struct gfs2_holder sb_gh;
479 	u64 no_addr;
480 	int ret;
481 
482 	ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
483 				LM_ST_SHARED, 0, &sb_gh);
484 	if (ret) {
485 		fs_err(sdp, "can't acquire superblock glock: %d\n", ret);
486 		return ret;
487 	}
488 
489 	ret = gfs2_read_sb(sdp, silent);
490 	if (ret) {
491 		fs_err(sdp, "can't read superblock: %d\n", ret);
492 		goto out;
493 	}
494 
495 	switch(sdp->sd_sb.sb_fs_format) {
496 	case GFS2_FS_FORMAT_MAX:
497 		sb->s_xattr = gfs2_xattr_handlers_max;
498 		break;
499 
500 	case GFS2_FS_FORMAT_MIN:
501 		sb->s_xattr = gfs2_xattr_handlers_min;
502 		break;
503 
504 	default:
505 		BUG();
506 	}
507 
508 	/* Set up the buffer cache and SB for real */
509 	if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) {
510 		ret = -EINVAL;
511 		fs_err(sdp, "FS block size (%u) is too small for device "
512 		       "block size (%u)\n",
513 		       sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev));
514 		goto out;
515 	}
516 	if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
517 		ret = -EINVAL;
518 		fs_err(sdp, "FS block size (%u) is too big for machine "
519 		       "page size (%u)\n",
520 		       sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
521 		goto out;
522 	}
523 	sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
524 
525 	/* Get the root inode */
526 	no_addr = sdp->sd_sb.sb_root_dir.no_addr;
527 	ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root");
528 	if (ret)
529 		goto out;
530 
531 	/* Get the master inode */
532 	no_addr = sdp->sd_sb.sb_master_dir.no_addr;
533 	ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master");
534 	if (ret) {
535 		dput(sdp->sd_root_dir);
536 		goto out;
537 	}
538 	sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir);
539 out:
540 	gfs2_glock_dq_uninit(&sb_gh);
541 	return ret;
542 }
543 
gfs2_others_may_mount(struct gfs2_sbd * sdp)544 static void gfs2_others_may_mount(struct gfs2_sbd *sdp)
545 {
546 	char *message = "FIRSTMOUNT=Done";
547 	char *envp[] = { message, NULL };
548 
549 	fs_info(sdp, "first mount done, others may mount\n");
550 
551 	if (sdp->sd_lockstruct.ls_ops->lm_first_done)
552 		sdp->sd_lockstruct.ls_ops->lm_first_done(sdp);
553 
554 	kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp);
555 }
556 
557 /**
558  * gfs2_jindex_hold - Grab a lock on the jindex
559  * @sdp: The GFS2 superblock
560  * @ji_gh: the holder for the jindex glock
561  *
562  * Returns: errno
563  */
564 
gfs2_jindex_hold(struct gfs2_sbd * sdp,struct gfs2_holder * ji_gh)565 static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
566 {
567 	struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex);
568 	struct qstr name;
569 	char buf[20];
570 	struct gfs2_jdesc *jd;
571 	int error;
572 
573 	name.name = buf;
574 
575 	mutex_lock(&sdp->sd_jindex_mutex);
576 
577 	for (;;) {
578 		struct gfs2_inode *jip;
579 
580 		error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh);
581 		if (error)
582 			break;
583 
584 		name.len = sprintf(buf, "journal%u", sdp->sd_journals);
585 		name.hash = gfs2_disk_hash(name.name, name.len);
586 
587 		error = gfs2_dir_check(sdp->sd_jindex, &name, NULL);
588 		if (error == -ENOENT) {
589 			error = 0;
590 			break;
591 		}
592 
593 		gfs2_glock_dq_uninit(ji_gh);
594 
595 		if (error)
596 			break;
597 
598 		error = -ENOMEM;
599 		jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
600 		if (!jd)
601 			break;
602 
603 		INIT_LIST_HEAD(&jd->extent_list);
604 		INIT_LIST_HEAD(&jd->jd_revoke_list);
605 
606 		INIT_WORK(&jd->jd_work, gfs2_recover_func);
607 		jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1);
608 		if (IS_ERR_OR_NULL(jd->jd_inode)) {
609 			if (!jd->jd_inode)
610 				error = -ENOENT;
611 			else
612 				error = PTR_ERR(jd->jd_inode);
613 			kfree(jd);
614 			break;
615 		}
616 
617 		d_mark_dontcache(jd->jd_inode);
618 		spin_lock(&sdp->sd_jindex_spin);
619 		jd->jd_jid = sdp->sd_journals++;
620 		jip = GFS2_I(jd->jd_inode);
621 		jd->jd_no_addr = jip->i_no_addr;
622 		list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
623 		spin_unlock(&sdp->sd_jindex_spin);
624 	}
625 
626 	mutex_unlock(&sdp->sd_jindex_mutex);
627 
628 	return error;
629 }
630 
631 /**
632  * init_statfs - look up and initialize master and local (per node) statfs inodes
633  * @sdp: The GFS2 superblock
634  *
635  * This should be called after the jindex is initialized in init_journal() and
636  * before gfs2_journal_recovery() is called because we need to be able to write
637  * to these inodes during recovery.
638  *
639  * Returns: errno
640  */
init_statfs(struct gfs2_sbd * sdp)641 static int init_statfs(struct gfs2_sbd *sdp)
642 {
643 	int error = 0;
644 	struct inode *master = d_inode(sdp->sd_master_dir);
645 	struct inode *pn = NULL;
646 	char buf[30];
647 	struct gfs2_jdesc *jd;
648 	struct gfs2_inode *ip;
649 
650 	sdp->sd_statfs_inode = gfs2_lookup_meta(master, "statfs");
651 	if (IS_ERR(sdp->sd_statfs_inode)) {
652 		error = PTR_ERR(sdp->sd_statfs_inode);
653 		fs_err(sdp, "can't read in statfs inode: %d\n", error);
654 		goto out;
655 	}
656 	if (sdp->sd_args.ar_spectator)
657 		goto out;
658 
659 	pn = gfs2_lookup_meta(master, "per_node");
660 	if (IS_ERR(pn)) {
661 		error = PTR_ERR(pn);
662 		fs_err(sdp, "can't find per_node directory: %d\n", error);
663 		goto put_statfs;
664 	}
665 
666 	/* For each jid, lookup the corresponding local statfs inode in the
667 	 * per_node metafs directory and save it in the sdp->sd_sc_inodes_list. */
668 	list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
669 		struct local_statfs_inode *lsi =
670 			kmalloc(sizeof(struct local_statfs_inode), GFP_NOFS);
671 		if (!lsi) {
672 			error = -ENOMEM;
673 			goto free_local;
674 		}
675 		sprintf(buf, "statfs_change%u", jd->jd_jid);
676 		lsi->si_sc_inode = gfs2_lookup_meta(pn, buf);
677 		if (IS_ERR(lsi->si_sc_inode)) {
678 			error = PTR_ERR(lsi->si_sc_inode);
679 			fs_err(sdp, "can't find local \"sc\" file#%u: %d\n",
680 			       jd->jd_jid, error);
681 			kfree(lsi);
682 			goto free_local;
683 		}
684 		lsi->si_jid = jd->jd_jid;
685 		if (jd->jd_jid == sdp->sd_jdesc->jd_jid)
686 			sdp->sd_sc_inode = lsi->si_sc_inode;
687 
688 		list_add_tail(&lsi->si_list, &sdp->sd_sc_inodes_list);
689 	}
690 
691 	iput(pn);
692 	pn = NULL;
693 	ip = GFS2_I(sdp->sd_sc_inode);
694 	error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_NOPID,
695 				   &sdp->sd_sc_gh);
696 	if (error) {
697 		fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
698 		goto free_local;
699 	}
700 	/* read in the local statfs buffer - other nodes don't change it. */
701 	error = gfs2_meta_inode_buffer(ip, &sdp->sd_sc_bh);
702 	if (error) {
703 		fs_err(sdp, "Cannot read in local statfs: %d\n", error);
704 		goto unlock_sd_gh;
705 	}
706 	return 0;
707 
708 unlock_sd_gh:
709 	gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
710 free_local:
711 	free_local_statfs_inodes(sdp);
712 	iput(pn);
713 put_statfs:
714 	iput(sdp->sd_statfs_inode);
715 out:
716 	return error;
717 }
718 
719 /* Uninitialize and free up memory used by the list of statfs inodes */
uninit_statfs(struct gfs2_sbd * sdp)720 static void uninit_statfs(struct gfs2_sbd *sdp)
721 {
722 	if (!sdp->sd_args.ar_spectator) {
723 		brelse(sdp->sd_sc_bh);
724 		gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
725 		free_local_statfs_inodes(sdp);
726 	}
727 	iput(sdp->sd_statfs_inode);
728 }
729 
init_journal(struct gfs2_sbd * sdp,int undo)730 static int init_journal(struct gfs2_sbd *sdp, int undo)
731 {
732 	struct inode *master = d_inode(sdp->sd_master_dir);
733 	struct gfs2_holder ji_gh;
734 	struct gfs2_inode *ip;
735 	int error = 0;
736 
737 	gfs2_holder_mark_uninitialized(&ji_gh);
738 	if (undo)
739 		goto fail_statfs;
740 
741 	sdp->sd_jindex = gfs2_lookup_meta(master, "jindex");
742 	if (IS_ERR(sdp->sd_jindex)) {
743 		fs_err(sdp, "can't lookup journal index: %d\n", error);
744 		return PTR_ERR(sdp->sd_jindex);
745 	}
746 
747 	/* Load in the journal index special file */
748 
749 	error = gfs2_jindex_hold(sdp, &ji_gh);
750 	if (error) {
751 		fs_err(sdp, "can't read journal index: %d\n", error);
752 		goto fail;
753 	}
754 
755 	error = -EUSERS;
756 	if (!gfs2_jindex_size(sdp)) {
757 		fs_err(sdp, "no journals!\n");
758 		goto fail_jindex;
759 	}
760 
761 	atomic_set(&sdp->sd_log_blks_needed, 0);
762 	if (sdp->sd_args.ar_spectator) {
763 		sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
764 		atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
765 		atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
766 		atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
767 	} else {
768 		if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
769 			fs_err(sdp, "can't mount journal #%u\n",
770 			       sdp->sd_lockstruct.ls_jid);
771 			fs_err(sdp, "there are only %u journals (0 - %u)\n",
772 			       gfs2_jindex_size(sdp),
773 			       gfs2_jindex_size(sdp) - 1);
774 			goto fail_jindex;
775 		}
776 		sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
777 
778 		error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
779 					  &gfs2_journal_glops,
780 					  LM_ST_EXCLUSIVE,
781 					  LM_FLAG_NOEXP | GL_NOCACHE | GL_NOPID,
782 					  &sdp->sd_journal_gh);
783 		if (error) {
784 			fs_err(sdp, "can't acquire journal glock: %d\n", error);
785 			goto fail_jindex;
786 		}
787 
788 		ip = GFS2_I(sdp->sd_jdesc->jd_inode);
789 		sdp->sd_jinode_gl = ip->i_gl;
790 		error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
791 					   LM_FLAG_NOEXP | GL_EXACT |
792 					   GL_NOCACHE | GL_NOPID,
793 					   &sdp->sd_jinode_gh);
794 		if (error) {
795 			fs_err(sdp, "can't acquire journal inode glock: %d\n",
796 			       error);
797 			goto fail_journal_gh;
798 		}
799 
800 		error = gfs2_jdesc_check(sdp->sd_jdesc);
801 		if (error) {
802 			fs_err(sdp, "my journal (%u) is bad: %d\n",
803 			       sdp->sd_jdesc->jd_jid, error);
804 			goto fail_jinode_gh;
805 		}
806 		atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
807 		atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
808 		atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
809 
810 		/* Map the extents for this journal's blocks */
811 		gfs2_map_journal_extents(sdp, sdp->sd_jdesc);
812 	}
813 	trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free));
814 
815 	/* Lookup statfs inodes here so journal recovery can use them. */
816 	error = init_statfs(sdp);
817 	if (error)
818 		goto fail_jinode_gh;
819 
820 	if (sdp->sd_lockstruct.ls_first) {
821 		unsigned int x;
822 		for (x = 0; x < sdp->sd_journals; x++) {
823 			struct gfs2_jdesc *jd = gfs2_jdesc_find(sdp, x);
824 
825 			if (sdp->sd_args.ar_spectator) {
826 				error = check_journal_clean(sdp, jd, true);
827 				if (error)
828 					goto fail_statfs;
829 				continue;
830 			}
831 			error = gfs2_recover_journal(jd, true);
832 			if (error) {
833 				fs_err(sdp, "error recovering journal %u: %d\n",
834 				       x, error);
835 				goto fail_statfs;
836 			}
837 		}
838 
839 		gfs2_others_may_mount(sdp);
840 	} else if (!sdp->sd_args.ar_spectator) {
841 		error = gfs2_recover_journal(sdp->sd_jdesc, true);
842 		if (error) {
843 			fs_err(sdp, "error recovering my journal: %d\n", error);
844 			goto fail_statfs;
845 		}
846 	}
847 
848 	sdp->sd_log_idle = 1;
849 	set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
850 	gfs2_glock_dq_uninit(&ji_gh);
851 	INIT_WORK(&sdp->sd_freeze_work, gfs2_freeze_func);
852 	return 0;
853 
854 fail_statfs:
855 	uninit_statfs(sdp);
856 fail_jinode_gh:
857 	/* A withdraw may have done dq/uninit so now we need to check it */
858 	if (!sdp->sd_args.ar_spectator &&
859 	    gfs2_holder_initialized(&sdp->sd_jinode_gh))
860 		gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
861 fail_journal_gh:
862 	if (!sdp->sd_args.ar_spectator &&
863 	    gfs2_holder_initialized(&sdp->sd_journal_gh))
864 		gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
865 fail_jindex:
866 	gfs2_jindex_free(sdp);
867 	if (gfs2_holder_initialized(&ji_gh))
868 		gfs2_glock_dq_uninit(&ji_gh);
869 fail:
870 	iput(sdp->sd_jindex);
871 	return error;
872 }
873 
874 static struct lock_class_key gfs2_quota_imutex_key;
875 
init_inodes(struct gfs2_sbd * sdp,int undo)876 static int init_inodes(struct gfs2_sbd *sdp, int undo)
877 {
878 	int error = 0;
879 	struct inode *master = d_inode(sdp->sd_master_dir);
880 
881 	if (undo)
882 		goto fail_qinode;
883 
884 	error = init_journal(sdp, undo);
885 	complete_all(&sdp->sd_journal_ready);
886 	if (error)
887 		goto fail;
888 
889 	/* Read in the resource index inode */
890 	sdp->sd_rindex = gfs2_lookup_meta(master, "rindex");
891 	if (IS_ERR(sdp->sd_rindex)) {
892 		error = PTR_ERR(sdp->sd_rindex);
893 		fs_err(sdp, "can't get resource index inode: %d\n", error);
894 		goto fail_journal;
895 	}
896 	sdp->sd_rindex_uptodate = 0;
897 
898 	/* Read in the quota inode */
899 	sdp->sd_quota_inode = gfs2_lookup_meta(master, "quota");
900 	if (IS_ERR(sdp->sd_quota_inode)) {
901 		error = PTR_ERR(sdp->sd_quota_inode);
902 		fs_err(sdp, "can't get quota file inode: %d\n", error);
903 		goto fail_rindex;
904 	}
905 	/*
906 	 * i_rwsem on quota files is special. Since this inode is hidden system
907 	 * file, we are safe to define locking ourselves.
908 	 */
909 	lockdep_set_class(&sdp->sd_quota_inode->i_rwsem,
910 			  &gfs2_quota_imutex_key);
911 
912 	error = gfs2_rindex_update(sdp);
913 	if (error)
914 		goto fail_qinode;
915 
916 	return 0;
917 
918 fail_qinode:
919 	iput(sdp->sd_quota_inode);
920 fail_rindex:
921 	gfs2_clear_rgrpd(sdp);
922 	iput(sdp->sd_rindex);
923 fail_journal:
924 	init_journal(sdp, UNDO);
925 fail:
926 	return error;
927 }
928 
init_per_node(struct gfs2_sbd * sdp,int undo)929 static int init_per_node(struct gfs2_sbd *sdp, int undo)
930 {
931 	struct inode *pn = NULL;
932 	char buf[30];
933 	int error = 0;
934 	struct gfs2_inode *ip;
935 	struct inode *master = d_inode(sdp->sd_master_dir);
936 
937 	if (sdp->sd_args.ar_spectator)
938 		return 0;
939 
940 	if (undo)
941 		goto fail_qc_gh;
942 
943 	pn = gfs2_lookup_meta(master, "per_node");
944 	if (IS_ERR(pn)) {
945 		error = PTR_ERR(pn);
946 		fs_err(sdp, "can't find per_node directory: %d\n", error);
947 		return error;
948 	}
949 
950 	sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
951 	sdp->sd_qc_inode = gfs2_lookup_meta(pn, buf);
952 	if (IS_ERR(sdp->sd_qc_inode)) {
953 		error = PTR_ERR(sdp->sd_qc_inode);
954 		fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
955 		goto fail_ut_i;
956 	}
957 
958 	iput(pn);
959 	pn = NULL;
960 
961 	ip = GFS2_I(sdp->sd_qc_inode);
962 	error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, GL_NOPID,
963 				   &sdp->sd_qc_gh);
964 	if (error) {
965 		fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
966 		goto fail_qc_i;
967 	}
968 
969 	return 0;
970 
971 fail_qc_gh:
972 	gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
973 fail_qc_i:
974 	iput(sdp->sd_qc_inode);
975 fail_ut_i:
976 	iput(pn);
977 	return error;
978 }
979 
980 static const match_table_t nolock_tokens = {
981 	{ Opt_jid, "jid=%d", },
982 	{ Opt_err, NULL },
983 };
984 
985 static const struct lm_lockops nolock_ops = {
986 	.lm_proto_name = "lock_nolock",
987 	.lm_put_lock = gfs2_glock_free,
988 	.lm_tokens = &nolock_tokens,
989 };
990 
991 /**
992  * gfs2_lm_mount - mount a locking protocol
993  * @sdp: the filesystem
994  * @silent: if 1, don't complain if the FS isn't a GFS2 fs
995  *
996  * Returns: errno
997  */
998 
gfs2_lm_mount(struct gfs2_sbd * sdp,int silent)999 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
1000 {
1001 	const struct lm_lockops *lm;
1002 	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
1003 	struct gfs2_args *args = &sdp->sd_args;
1004 	const char *proto = sdp->sd_proto_name;
1005 	const char *table = sdp->sd_table_name;
1006 	char *o, *options;
1007 	int ret;
1008 
1009 	if (!strcmp("lock_nolock", proto)) {
1010 		lm = &nolock_ops;
1011 		sdp->sd_args.ar_localflocks = 1;
1012 #ifdef CONFIG_GFS2_FS_LOCKING_DLM
1013 	} else if (!strcmp("lock_dlm", proto)) {
1014 		lm = &gfs2_dlm_ops;
1015 #endif
1016 	} else {
1017 		pr_info("can't find protocol %s\n", proto);
1018 		return -ENOENT;
1019 	}
1020 
1021 	fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
1022 
1023 	ls->ls_ops = lm;
1024 	ls->ls_first = 1;
1025 
1026 	for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) {
1027 		substring_t tmp[MAX_OPT_ARGS];
1028 		int token, option;
1029 
1030 		if (!o || !*o)
1031 			continue;
1032 
1033 		token = match_token(o, *lm->lm_tokens, tmp);
1034 		switch (token) {
1035 		case Opt_jid:
1036 			ret = match_int(&tmp[0], &option);
1037 			if (ret || option < 0)
1038 				goto hostdata_error;
1039 			if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags))
1040 				ls->ls_jid = option;
1041 			break;
1042 		case Opt_id:
1043 		case Opt_nodir:
1044 			/* Obsolete, but left for backward compat purposes */
1045 			break;
1046 		case Opt_first:
1047 			ret = match_int(&tmp[0], &option);
1048 			if (ret || (option != 0 && option != 1))
1049 				goto hostdata_error;
1050 			ls->ls_first = option;
1051 			break;
1052 		case Opt_err:
1053 		default:
1054 hostdata_error:
1055 			fs_info(sdp, "unknown hostdata (%s)\n", o);
1056 			return -EINVAL;
1057 		}
1058 	}
1059 
1060 	if (lm->lm_mount == NULL) {
1061 		fs_info(sdp, "Now mounting FS (format %u)...\n", sdp->sd_sb.sb_fs_format);
1062 		complete_all(&sdp->sd_locking_init);
1063 		return 0;
1064 	}
1065 	ret = lm->lm_mount(sdp, table);
1066 	if (ret == 0)
1067 		fs_info(sdp, "Joined cluster. Now mounting FS (format %u)...\n",
1068 		        sdp->sd_sb.sb_fs_format);
1069 	complete_all(&sdp->sd_locking_init);
1070 	return ret;
1071 }
1072 
gfs2_lm_unmount(struct gfs2_sbd * sdp)1073 void gfs2_lm_unmount(struct gfs2_sbd *sdp)
1074 {
1075 	const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops;
1076 	if (!gfs2_withdrawing_or_withdrawn(sdp) && lm->lm_unmount)
1077 		lm->lm_unmount(sdp);
1078 }
1079 
wait_on_journal(struct gfs2_sbd * sdp)1080 static int wait_on_journal(struct gfs2_sbd *sdp)
1081 {
1082 	if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
1083 		return 0;
1084 
1085 	return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, TASK_INTERRUPTIBLE)
1086 		? -EINTR : 0;
1087 }
1088 
gfs2_online_uevent(struct gfs2_sbd * sdp)1089 void gfs2_online_uevent(struct gfs2_sbd *sdp)
1090 {
1091 	struct super_block *sb = sdp->sd_vfs;
1092 	char ro[20];
1093 	char spectator[20];
1094 	char *envp[] = { ro, spectator, NULL };
1095 	sprintf(ro, "RDONLY=%d", sb_rdonly(sb));
1096 	sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
1097 	kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp);
1098 }
1099 
init_threads(struct gfs2_sbd * sdp)1100 static int init_threads(struct gfs2_sbd *sdp)
1101 {
1102 	struct task_struct *p;
1103 	int error = 0;
1104 
1105 	p = kthread_create(gfs2_logd, sdp, "gfs2_logd/%s", sdp->sd_fsname);
1106 	if (IS_ERR(p)) {
1107 		error = PTR_ERR(p);
1108 		fs_err(sdp, "can't create logd thread: %d\n", error);
1109 		return error;
1110 	}
1111 	get_task_struct(p);
1112 	sdp->sd_logd_process = p;
1113 
1114 	p = kthread_create(gfs2_quotad, sdp, "gfs2_quotad/%s", sdp->sd_fsname);
1115 	if (IS_ERR(p)) {
1116 		error = PTR_ERR(p);
1117 		fs_err(sdp, "can't create quotad thread: %d\n", error);
1118 		goto fail;
1119 	}
1120 	get_task_struct(p);
1121 	sdp->sd_quotad_process = p;
1122 
1123 	wake_up_process(sdp->sd_logd_process);
1124 	wake_up_process(sdp->sd_quotad_process);
1125 	return 0;
1126 
1127 fail:
1128 	kthread_stop_put(sdp->sd_logd_process);
1129 	sdp->sd_logd_process = NULL;
1130 	return error;
1131 }
1132 
gfs2_destroy_threads(struct gfs2_sbd * sdp)1133 void gfs2_destroy_threads(struct gfs2_sbd *sdp)
1134 {
1135 	if (sdp->sd_logd_process) {
1136 		kthread_stop_put(sdp->sd_logd_process);
1137 		sdp->sd_logd_process = NULL;
1138 	}
1139 	if (sdp->sd_quotad_process) {
1140 		kthread_stop_put(sdp->sd_quotad_process);
1141 		sdp->sd_quotad_process = NULL;
1142 	}
1143 }
1144 
1145 /**
1146  * gfs2_fill_super - Read in superblock
1147  * @sb: The VFS superblock
1148  * @fc: Mount options and flags
1149  *
1150  * Returns: -errno
1151  */
gfs2_fill_super(struct super_block * sb,struct fs_context * fc)1152 static int gfs2_fill_super(struct super_block *sb, struct fs_context *fc)
1153 {
1154 	struct gfs2_args *args = fc->fs_private;
1155 	int silent = fc->sb_flags & SB_SILENT;
1156 	struct gfs2_sbd *sdp;
1157 	struct gfs2_holder mount_gh;
1158 	int error;
1159 
1160 	sdp = init_sbd(sb);
1161 	if (!sdp) {
1162 		pr_warn("can't alloc struct gfs2_sbd\n");
1163 		return -ENOMEM;
1164 	}
1165 	sdp->sd_args = *args;
1166 
1167 	if (sdp->sd_args.ar_spectator) {
1168                 sb->s_flags |= SB_RDONLY;
1169 		set_bit(SDF_RORECOVERY, &sdp->sd_flags);
1170 	}
1171 	if (sdp->sd_args.ar_posix_acl)
1172 		sb->s_flags |= SB_POSIXACL;
1173 	if (sdp->sd_args.ar_nobarrier)
1174 		set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1175 
1176 	sb->s_flags |= SB_NOSEC;
1177 	sb->s_magic = GFS2_MAGIC;
1178 	sb->s_op = &gfs2_super_ops;
1179 	sb->s_d_op = &gfs2_dops;
1180 	sb->s_export_op = &gfs2_export_ops;
1181 	sb->s_qcop = &gfs2_quotactl_ops;
1182 	sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1183 	sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
1184 	sb->s_time_gran = 1;
1185 	sb->s_maxbytes = MAX_LFS_FILESIZE;
1186 
1187 	/* Set up the buffer cache and fill in some fake block size values
1188 	   to allow us to read-in the on-disk superblock. */
1189 	sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, 512);
1190 	sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
1191 	sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift - 9;
1192 	sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift);
1193 
1194 	sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit;
1195 	sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum;
1196 	if (sdp->sd_args.ar_statfs_quantum) {
1197 		sdp->sd_tune.gt_statfs_slow = 0;
1198 		sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum;
1199 	} else {
1200 		sdp->sd_tune.gt_statfs_slow = 1;
1201 		sdp->sd_tune.gt_statfs_quantum = 30;
1202 	}
1203 
1204 	error = init_names(sdp, silent);
1205 	if (error)
1206 		goto fail_free;
1207 
1208 	snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s", sdp->sd_table_name);
1209 
1210 	sdp->sd_delete_wq = alloc_workqueue("gfs2-delete/%s",
1211 			WQ_MEM_RECLAIM | WQ_FREEZABLE, 0, sdp->sd_fsname);
1212 	error = -ENOMEM;
1213 	if (!sdp->sd_delete_wq)
1214 		goto fail_free;
1215 
1216 	error = gfs2_sys_fs_add(sdp);
1217 	if (error)
1218 		goto fail_delete_wq;
1219 
1220 	gfs2_create_debugfs_file(sdp);
1221 
1222 	error = gfs2_lm_mount(sdp, silent);
1223 	if (error)
1224 		goto fail_debug;
1225 
1226 	error = init_locking(sdp, &mount_gh, DO);
1227 	if (error)
1228 		goto fail_lm;
1229 
1230 	error = init_sb(sdp, silent);
1231 	if (error)
1232 		goto fail_locking;
1233 
1234 	/* Turn rgrplvb on by default if fs format is recent enough */
1235 	if (!sdp->sd_args.ar_got_rgrplvb && sdp->sd_sb.sb_fs_format > 1801)
1236 		sdp->sd_args.ar_rgrplvb = 1;
1237 
1238 	error = wait_on_journal(sdp);
1239 	if (error)
1240 		goto fail_sb;
1241 
1242 	/*
1243 	 * If user space has failed to join the cluster or some similar
1244 	 * failure has occurred, then the journal id will contain a
1245 	 * negative (error) number. This will then be returned to the
1246 	 * caller (of the mount syscall). We do this even for spectator
1247 	 * mounts (which just write a jid of 0 to indicate "ok" even though
1248 	 * the jid is unused in the spectator case)
1249 	 */
1250 	if (sdp->sd_lockstruct.ls_jid < 0) {
1251 		error = sdp->sd_lockstruct.ls_jid;
1252 		sdp->sd_lockstruct.ls_jid = 0;
1253 		goto fail_sb;
1254 	}
1255 
1256 	if (sdp->sd_args.ar_spectator)
1257 		snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.s",
1258 			 sdp->sd_table_name);
1259 	else
1260 		snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.%u",
1261 			 sdp->sd_table_name, sdp->sd_lockstruct.ls_jid);
1262 
1263 	error = init_inodes(sdp, DO);
1264 	if (error)
1265 		goto fail_sb;
1266 
1267 	error = init_per_node(sdp, DO);
1268 	if (error)
1269 		goto fail_inodes;
1270 
1271 	error = gfs2_statfs_init(sdp);
1272 	if (error) {
1273 		fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
1274 		goto fail_per_node;
1275 	}
1276 
1277 	if (!sb_rdonly(sb)) {
1278 		error = init_threads(sdp);
1279 		if (error)
1280 			goto fail_per_node;
1281 	}
1282 
1283 	error = gfs2_freeze_lock_shared(sdp);
1284 	if (error)
1285 		goto fail_per_node;
1286 
1287 	if (!sb_rdonly(sb))
1288 		error = gfs2_make_fs_rw(sdp);
1289 
1290 	if (error) {
1291 		gfs2_freeze_unlock(&sdp->sd_freeze_gh);
1292 		gfs2_destroy_threads(sdp);
1293 		fs_err(sdp, "can't make FS RW: %d\n", error);
1294 		goto fail_per_node;
1295 	}
1296 	gfs2_glock_dq_uninit(&mount_gh);
1297 	gfs2_online_uevent(sdp);
1298 	return 0;
1299 
1300 fail_per_node:
1301 	init_per_node(sdp, UNDO);
1302 fail_inodes:
1303 	init_inodes(sdp, UNDO);
1304 fail_sb:
1305 	if (sdp->sd_root_dir)
1306 		dput(sdp->sd_root_dir);
1307 	if (sdp->sd_master_dir)
1308 		dput(sdp->sd_master_dir);
1309 	if (sb->s_root)
1310 		dput(sb->s_root);
1311 	sb->s_root = NULL;
1312 fail_locking:
1313 	init_locking(sdp, &mount_gh, UNDO);
1314 fail_lm:
1315 	complete_all(&sdp->sd_journal_ready);
1316 	gfs2_gl_hash_clear(sdp);
1317 	gfs2_lm_unmount(sdp);
1318 fail_debug:
1319 	gfs2_delete_debugfs_file(sdp);
1320 	gfs2_sys_fs_del(sdp);
1321 fail_delete_wq:
1322 	destroy_workqueue(sdp->sd_delete_wq);
1323 fail_free:
1324 	free_sbd(sdp);
1325 	sb->s_fs_info = NULL;
1326 	return error;
1327 }
1328 
1329 /**
1330  * gfs2_get_tree - Get the GFS2 superblock and root directory
1331  * @fc: The filesystem context
1332  *
1333  * Returns: 0 or -errno on error
1334  */
gfs2_get_tree(struct fs_context * fc)1335 static int gfs2_get_tree(struct fs_context *fc)
1336 {
1337 	struct gfs2_args *args = fc->fs_private;
1338 	struct gfs2_sbd *sdp;
1339 	int error;
1340 
1341 	error = get_tree_bdev(fc, gfs2_fill_super);
1342 	if (error)
1343 		return error;
1344 
1345 	sdp = fc->root->d_sb->s_fs_info;
1346 	dput(fc->root);
1347 	if (args->ar_meta)
1348 		fc->root = dget(sdp->sd_master_dir);
1349 	else
1350 		fc->root = dget(sdp->sd_root_dir);
1351 	return 0;
1352 }
1353 
gfs2_fc_free(struct fs_context * fc)1354 static void gfs2_fc_free(struct fs_context *fc)
1355 {
1356 	struct gfs2_args *args = fc->fs_private;
1357 
1358 	kfree(args);
1359 }
1360 
1361 enum gfs2_param {
1362 	Opt_lockproto,
1363 	Opt_locktable,
1364 	Opt_hostdata,
1365 	Opt_spectator,
1366 	Opt_ignore_local_fs,
1367 	Opt_localflocks,
1368 	Opt_localcaching,
1369 	Opt_debug,
1370 	Opt_upgrade,
1371 	Opt_acl,
1372 	Opt_quota,
1373 	Opt_quota_flag,
1374 	Opt_suiddir,
1375 	Opt_data,
1376 	Opt_meta,
1377 	Opt_discard,
1378 	Opt_commit,
1379 	Opt_errors,
1380 	Opt_statfs_quantum,
1381 	Opt_statfs_percent,
1382 	Opt_quota_quantum,
1383 	Opt_barrier,
1384 	Opt_rgrplvb,
1385 	Opt_loccookie,
1386 };
1387 
1388 static const struct constant_table gfs2_param_quota[] = {
1389 	{"off",        GFS2_QUOTA_OFF},
1390 	{"account",    GFS2_QUOTA_ACCOUNT},
1391 	{"on",         GFS2_QUOTA_ON},
1392 	{"quiet",      GFS2_QUOTA_QUIET},
1393 	{}
1394 };
1395 
1396 enum opt_data {
1397 	Opt_data_writeback = GFS2_DATA_WRITEBACK,
1398 	Opt_data_ordered   = GFS2_DATA_ORDERED,
1399 };
1400 
1401 static const struct constant_table gfs2_param_data[] = {
1402 	{"writeback",  Opt_data_writeback },
1403 	{"ordered",    Opt_data_ordered },
1404 	{}
1405 };
1406 
1407 enum opt_errors {
1408 	Opt_errors_withdraw = GFS2_ERRORS_WITHDRAW,
1409 	Opt_errors_panic    = GFS2_ERRORS_PANIC,
1410 };
1411 
1412 static const struct constant_table gfs2_param_errors[] = {
1413 	{"withdraw",   Opt_errors_withdraw },
1414 	{"panic",      Opt_errors_panic },
1415 	{}
1416 };
1417 
1418 static const struct fs_parameter_spec gfs2_fs_parameters[] = {
1419 	fsparam_string ("lockproto",          Opt_lockproto),
1420 	fsparam_string ("locktable",          Opt_locktable),
1421 	fsparam_string ("hostdata",           Opt_hostdata),
1422 	fsparam_flag   ("spectator",          Opt_spectator),
1423 	fsparam_flag   ("norecovery",         Opt_spectator),
1424 	fsparam_flag   ("ignore_local_fs",    Opt_ignore_local_fs),
1425 	fsparam_flag   ("localflocks",        Opt_localflocks),
1426 	fsparam_flag   ("localcaching",       Opt_localcaching),
1427 	fsparam_flag_no("debug",              Opt_debug),
1428 	fsparam_flag   ("upgrade",            Opt_upgrade),
1429 	fsparam_flag_no("acl",                Opt_acl),
1430 	fsparam_flag_no("suiddir",            Opt_suiddir),
1431 	fsparam_enum   ("data",               Opt_data, gfs2_param_data),
1432 	fsparam_flag   ("meta",               Opt_meta),
1433 	fsparam_flag_no("discard",            Opt_discard),
1434 	fsparam_s32    ("commit",             Opt_commit),
1435 	fsparam_enum   ("errors",             Opt_errors, gfs2_param_errors),
1436 	fsparam_s32    ("statfs_quantum",     Opt_statfs_quantum),
1437 	fsparam_s32    ("statfs_percent",     Opt_statfs_percent),
1438 	fsparam_s32    ("quota_quantum",      Opt_quota_quantum),
1439 	fsparam_flag_no("barrier",            Opt_barrier),
1440 	fsparam_flag_no("rgrplvb",            Opt_rgrplvb),
1441 	fsparam_flag_no("loccookie",          Opt_loccookie),
1442 	/* quota can be a flag or an enum so it gets special treatment */
1443 	fsparam_flag_no("quota",	      Opt_quota_flag),
1444 	fsparam_enum("quota",		      Opt_quota, gfs2_param_quota),
1445 	{}
1446 };
1447 
1448 /* Parse a single mount parameter */
gfs2_parse_param(struct fs_context * fc,struct fs_parameter * param)1449 static int gfs2_parse_param(struct fs_context *fc, struct fs_parameter *param)
1450 {
1451 	struct gfs2_args *args = fc->fs_private;
1452 	struct fs_parse_result result;
1453 	int o;
1454 
1455 	o = fs_parse(fc, gfs2_fs_parameters, param, &result);
1456 	if (o < 0)
1457 		return o;
1458 
1459 	switch (o) {
1460 	case Opt_lockproto:
1461 		strscpy(args->ar_lockproto, param->string, GFS2_LOCKNAME_LEN);
1462 		break;
1463 	case Opt_locktable:
1464 		strscpy(args->ar_locktable, param->string, GFS2_LOCKNAME_LEN);
1465 		break;
1466 	case Opt_hostdata:
1467 		strscpy(args->ar_hostdata, param->string, GFS2_LOCKNAME_LEN);
1468 		break;
1469 	case Opt_spectator:
1470 		args->ar_spectator = 1;
1471 		break;
1472 	case Opt_ignore_local_fs:
1473 		/* Retained for backwards compat only */
1474 		break;
1475 	case Opt_localflocks:
1476 		args->ar_localflocks = 1;
1477 		break;
1478 	case Opt_localcaching:
1479 		/* Retained for backwards compat only */
1480 		break;
1481 	case Opt_debug:
1482 		if (result.boolean && args->ar_errors == GFS2_ERRORS_PANIC)
1483 			return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive");
1484 		args->ar_debug = result.boolean;
1485 		break;
1486 	case Opt_upgrade:
1487 		/* Retained for backwards compat only */
1488 		break;
1489 	case Opt_acl:
1490 		args->ar_posix_acl = result.boolean;
1491 		break;
1492 	case Opt_quota_flag:
1493 		args->ar_quota = result.negated ? GFS2_QUOTA_OFF : GFS2_QUOTA_ON;
1494 		break;
1495 	case Opt_quota:
1496 		args->ar_quota = result.int_32;
1497 		break;
1498 	case Opt_suiddir:
1499 		args->ar_suiddir = result.boolean;
1500 		break;
1501 	case Opt_data:
1502 		/* The uint_32 result maps directly to GFS2_DATA_* */
1503 		args->ar_data = result.uint_32;
1504 		break;
1505 	case Opt_meta:
1506 		args->ar_meta = 1;
1507 		break;
1508 	case Opt_discard:
1509 		args->ar_discard = result.boolean;
1510 		break;
1511 	case Opt_commit:
1512 		if (result.int_32 <= 0)
1513 			return invalfc(fc, "commit mount option requires a positive numeric argument");
1514 		args->ar_commit = result.int_32;
1515 		break;
1516 	case Opt_statfs_quantum:
1517 		if (result.int_32 < 0)
1518 			return invalfc(fc, "statfs_quantum mount option requires a non-negative numeric argument");
1519 		args->ar_statfs_quantum = result.int_32;
1520 		break;
1521 	case Opt_quota_quantum:
1522 		if (result.int_32 <= 0)
1523 			return invalfc(fc, "quota_quantum mount option requires a positive numeric argument");
1524 		args->ar_quota_quantum = result.int_32;
1525 		break;
1526 	case Opt_statfs_percent:
1527 		if (result.int_32 < 0 || result.int_32 > 100)
1528 			return invalfc(fc, "statfs_percent mount option requires a numeric argument between 0 and 100");
1529 		args->ar_statfs_percent = result.int_32;
1530 		break;
1531 	case Opt_errors:
1532 		if (args->ar_debug && result.uint_32 == GFS2_ERRORS_PANIC)
1533 			return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive");
1534 		args->ar_errors = result.uint_32;
1535 		break;
1536 	case Opt_barrier:
1537 		args->ar_nobarrier = result.boolean;
1538 		break;
1539 	case Opt_rgrplvb:
1540 		args->ar_rgrplvb = result.boolean;
1541 		args->ar_got_rgrplvb = 1;
1542 		break;
1543 	case Opt_loccookie:
1544 		args->ar_loccookie = result.boolean;
1545 		break;
1546 	default:
1547 		return invalfc(fc, "invalid mount option: %s", param->key);
1548 	}
1549 	return 0;
1550 }
1551 
gfs2_reconfigure(struct fs_context * fc)1552 static int gfs2_reconfigure(struct fs_context *fc)
1553 {
1554 	struct super_block *sb = fc->root->d_sb;
1555 	struct gfs2_sbd *sdp = sb->s_fs_info;
1556 	struct gfs2_args *oldargs = &sdp->sd_args;
1557 	struct gfs2_args *newargs = fc->fs_private;
1558 	struct gfs2_tune *gt = &sdp->sd_tune;
1559 	int error = 0;
1560 
1561 	sync_filesystem(sb);
1562 
1563 	spin_lock(&gt->gt_spin);
1564 	oldargs->ar_commit = gt->gt_logd_secs;
1565 	oldargs->ar_quota_quantum = gt->gt_quota_quantum;
1566 	if (gt->gt_statfs_slow)
1567 		oldargs->ar_statfs_quantum = 0;
1568 	else
1569 		oldargs->ar_statfs_quantum = gt->gt_statfs_quantum;
1570 	spin_unlock(&gt->gt_spin);
1571 
1572 	if (strcmp(newargs->ar_lockproto, oldargs->ar_lockproto)) {
1573 		errorfc(fc, "reconfiguration of locking protocol not allowed");
1574 		return -EINVAL;
1575 	}
1576 	if (strcmp(newargs->ar_locktable, oldargs->ar_locktable)) {
1577 		errorfc(fc, "reconfiguration of lock table not allowed");
1578 		return -EINVAL;
1579 	}
1580 	if (strcmp(newargs->ar_hostdata, oldargs->ar_hostdata)) {
1581 		errorfc(fc, "reconfiguration of host data not allowed");
1582 		return -EINVAL;
1583 	}
1584 	if (newargs->ar_spectator != oldargs->ar_spectator) {
1585 		errorfc(fc, "reconfiguration of spectator mode not allowed");
1586 		return -EINVAL;
1587 	}
1588 	if (newargs->ar_localflocks != oldargs->ar_localflocks) {
1589 		errorfc(fc, "reconfiguration of localflocks not allowed");
1590 		return -EINVAL;
1591 	}
1592 	if (newargs->ar_meta != oldargs->ar_meta) {
1593 		errorfc(fc, "switching between gfs2 and gfs2meta not allowed");
1594 		return -EINVAL;
1595 	}
1596 	if (oldargs->ar_spectator)
1597 		fc->sb_flags |= SB_RDONLY;
1598 
1599 	if ((sb->s_flags ^ fc->sb_flags) & SB_RDONLY) {
1600 		if (fc->sb_flags & SB_RDONLY) {
1601 			gfs2_make_fs_ro(sdp);
1602 		} else {
1603 			error = gfs2_make_fs_rw(sdp);
1604 			if (error)
1605 				errorfc(fc, "unable to remount read-write");
1606 		}
1607 	}
1608 	sdp->sd_args = *newargs;
1609 
1610 	if (sdp->sd_args.ar_posix_acl)
1611 		sb->s_flags |= SB_POSIXACL;
1612 	else
1613 		sb->s_flags &= ~SB_POSIXACL;
1614 	if (sdp->sd_args.ar_nobarrier)
1615 		set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1616 	else
1617 		clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1618 	spin_lock(&gt->gt_spin);
1619 	gt->gt_logd_secs = newargs->ar_commit;
1620 	gt->gt_quota_quantum = newargs->ar_quota_quantum;
1621 	if (newargs->ar_statfs_quantum) {
1622 		gt->gt_statfs_slow = 0;
1623 		gt->gt_statfs_quantum = newargs->ar_statfs_quantum;
1624 	}
1625 	else {
1626 		gt->gt_statfs_slow = 1;
1627 		gt->gt_statfs_quantum = 30;
1628 	}
1629 	spin_unlock(&gt->gt_spin);
1630 
1631 	gfs2_online_uevent(sdp);
1632 	return error;
1633 }
1634 
1635 static const struct fs_context_operations gfs2_context_ops = {
1636 	.free        = gfs2_fc_free,
1637 	.parse_param = gfs2_parse_param,
1638 	.get_tree    = gfs2_get_tree,
1639 	.reconfigure = gfs2_reconfigure,
1640 };
1641 
1642 /* Set up the filesystem mount context */
gfs2_init_fs_context(struct fs_context * fc)1643 static int gfs2_init_fs_context(struct fs_context *fc)
1644 {
1645 	struct gfs2_args *args;
1646 
1647 	args = kmalloc(sizeof(*args), GFP_KERNEL);
1648 	if (args == NULL)
1649 		return -ENOMEM;
1650 
1651 	if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
1652 		struct gfs2_sbd *sdp = fc->root->d_sb->s_fs_info;
1653 
1654 		*args = sdp->sd_args;
1655 	} else {
1656 		memset(args, 0, sizeof(*args));
1657 		args->ar_quota = GFS2_QUOTA_DEFAULT;
1658 		args->ar_data = GFS2_DATA_DEFAULT;
1659 		args->ar_commit = 30;
1660 		args->ar_statfs_quantum = 30;
1661 		args->ar_quota_quantum = 60;
1662 		args->ar_errors = GFS2_ERRORS_DEFAULT;
1663 	}
1664 	fc->fs_private = args;
1665 	fc->ops = &gfs2_context_ops;
1666 	return 0;
1667 }
1668 
set_meta_super(struct super_block * s,struct fs_context * fc)1669 static int set_meta_super(struct super_block *s, struct fs_context *fc)
1670 {
1671 	return -EINVAL;
1672 }
1673 
test_meta_super(struct super_block * s,struct fs_context * fc)1674 static int test_meta_super(struct super_block *s, struct fs_context *fc)
1675 {
1676 	return (fc->sget_key == s->s_bdev);
1677 }
1678 
gfs2_meta_get_tree(struct fs_context * fc)1679 static int gfs2_meta_get_tree(struct fs_context *fc)
1680 {
1681 	struct super_block *s;
1682 	struct gfs2_sbd *sdp;
1683 	struct path path;
1684 	int error;
1685 
1686 	if (!fc->source || !*fc->source)
1687 		return -EINVAL;
1688 
1689 	error = kern_path(fc->source, LOOKUP_FOLLOW, &path);
1690 	if (error) {
1691 		pr_warn("path_lookup on %s returned error %d\n",
1692 		        fc->source, error);
1693 		return error;
1694 	}
1695 	fc->fs_type = &gfs2_fs_type;
1696 	fc->sget_key = path.dentry->d_sb->s_bdev;
1697 	s = sget_fc(fc, test_meta_super, set_meta_super);
1698 	path_put(&path);
1699 	if (IS_ERR(s)) {
1700 		pr_warn("gfs2 mount does not exist\n");
1701 		return PTR_ERR(s);
1702 	}
1703 	if ((fc->sb_flags ^ s->s_flags) & SB_RDONLY) {
1704 		deactivate_locked_super(s);
1705 		return -EBUSY;
1706 	}
1707 	sdp = s->s_fs_info;
1708 	fc->root = dget(sdp->sd_master_dir);
1709 	return 0;
1710 }
1711 
1712 static const struct fs_context_operations gfs2_meta_context_ops = {
1713 	.free        = gfs2_fc_free,
1714 	.get_tree    = gfs2_meta_get_tree,
1715 };
1716 
gfs2_meta_init_fs_context(struct fs_context * fc)1717 static int gfs2_meta_init_fs_context(struct fs_context *fc)
1718 {
1719 	int ret = gfs2_init_fs_context(fc);
1720 
1721 	if (ret)
1722 		return ret;
1723 
1724 	fc->ops = &gfs2_meta_context_ops;
1725 	return 0;
1726 }
1727 
1728 /**
1729  * gfs2_evict_inodes - evict inodes cooperatively
1730  * @sb: the superblock
1731  *
1732  * When evicting an inode with a zero link count, we are trying to upgrade the
1733  * inode's iopen glock from SH to EX mode in order to determine if we can
1734  * delete the inode.  The other nodes are supposed to evict the inode from
1735  * their caches if they can, and to poke the inode's inode glock if they cannot
1736  * do so.  Either behavior allows gfs2_upgrade_iopen_glock() to proceed
1737  * quickly, but if the other nodes are not cooperating, the lock upgrading
1738  * attempt will time out.  Since inodes are evicted sequentially, this can add
1739  * up quickly.
1740  *
1741  * Function evict_inodes() tries to keep the s_inode_list_lock list locked over
1742  * a long time, which prevents other inodes from being evicted concurrently.
1743  * This precludes the cooperative behavior we are looking for.  This special
1744  * version of evict_inodes() avoids that.
1745  *
1746  * Modeled after drop_pagecache_sb().
1747  */
gfs2_evict_inodes(struct super_block * sb)1748 static void gfs2_evict_inodes(struct super_block *sb)
1749 {
1750 	struct inode *inode, *toput_inode = NULL;
1751 	struct gfs2_sbd *sdp = sb->s_fs_info;
1752 
1753 	set_bit(SDF_EVICTING, &sdp->sd_flags);
1754 
1755 	spin_lock(&sb->s_inode_list_lock);
1756 	list_for_each_entry(inode, &sb->s_inodes, i_sb_list) {
1757 		spin_lock(&inode->i_lock);
1758 		if ((inode->i_state & (I_FREEING|I_WILL_FREE|I_NEW)) &&
1759 		    !need_resched()) {
1760 			spin_unlock(&inode->i_lock);
1761 			continue;
1762 		}
1763 		atomic_inc(&inode->i_count);
1764 		spin_unlock(&inode->i_lock);
1765 		spin_unlock(&sb->s_inode_list_lock);
1766 
1767 		iput(toput_inode);
1768 		toput_inode = inode;
1769 
1770 		cond_resched();
1771 		spin_lock(&sb->s_inode_list_lock);
1772 	}
1773 	spin_unlock(&sb->s_inode_list_lock);
1774 	iput(toput_inode);
1775 }
1776 
gfs2_kill_sb(struct super_block * sb)1777 static void gfs2_kill_sb(struct super_block *sb)
1778 {
1779 	struct gfs2_sbd *sdp = sb->s_fs_info;
1780 
1781 	if (sdp == NULL) {
1782 		kill_block_super(sb);
1783 		return;
1784 	}
1785 
1786 	gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SYNC | GFS2_LFC_KILL_SB);
1787 	dput(sdp->sd_root_dir);
1788 	dput(sdp->sd_master_dir);
1789 	sdp->sd_root_dir = NULL;
1790 	sdp->sd_master_dir = NULL;
1791 	shrink_dcache_sb(sb);
1792 
1793 	gfs2_evict_inodes(sb);
1794 
1795 	/*
1796 	 * Flush and then drain the delete workqueue here (via
1797 	 * destroy_workqueue()) to ensure that any delete work that
1798 	 * may be running will also see the SDF_KILL flag.
1799 	 */
1800 	set_bit(SDF_KILL, &sdp->sd_flags);
1801 	gfs2_flush_delete_work(sdp);
1802 	destroy_workqueue(sdp->sd_delete_wq);
1803 
1804 	kill_block_super(sb);
1805 }
1806 
1807 struct file_system_type gfs2_fs_type = {
1808 	.name = "gfs2",
1809 	.fs_flags = FS_REQUIRES_DEV,
1810 	.init_fs_context = gfs2_init_fs_context,
1811 	.parameters = gfs2_fs_parameters,
1812 	.kill_sb = gfs2_kill_sb,
1813 	.owner = THIS_MODULE,
1814 };
1815 MODULE_ALIAS_FS("gfs2");
1816 
1817 struct file_system_type gfs2meta_fs_type = {
1818 	.name = "gfs2meta",
1819 	.fs_flags = FS_REQUIRES_DEV,
1820 	.init_fs_context = gfs2_meta_init_fs_context,
1821 	.owner = THIS_MODULE,
1822 };
1823 MODULE_ALIAS_FS("gfs2meta");
1824