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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_glock_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 	INIT_LIST_HEAD(&sdp->sd_trunc_list);
110 	spin_lock_init(&sdp->sd_trunc_lock);
111 	spin_lock_init(&sdp->sd_bitmap_lock);
112 
113 	INIT_LIST_HEAD(&sdp->sd_sc_inodes_list);
114 
115 	mapping = &sdp->sd_aspace;
116 
117 	address_space_init_once(mapping);
118 	mapping->a_ops = &gfs2_rgrp_aops;
119 	mapping->host = sb->s_bdev->bd_inode;
120 	mapping->flags = 0;
121 	mapping_set_gfp_mask(mapping, GFP_NOFS);
122 	mapping->private_data = NULL;
123 	mapping->writeback_index = 0;
124 
125 	spin_lock_init(&sdp->sd_log_lock);
126 	atomic_set(&sdp->sd_log_pinned, 0);
127 	INIT_LIST_HEAD(&sdp->sd_log_revokes);
128 	INIT_LIST_HEAD(&sdp->sd_log_ordered);
129 	spin_lock_init(&sdp->sd_ordered_lock);
130 
131 	init_waitqueue_head(&sdp->sd_log_waitq);
132 	init_waitqueue_head(&sdp->sd_logd_waitq);
133 	spin_lock_init(&sdp->sd_ail_lock);
134 	INIT_LIST_HEAD(&sdp->sd_ail1_list);
135 	INIT_LIST_HEAD(&sdp->sd_ail2_list);
136 
137 	init_rwsem(&sdp->sd_log_flush_lock);
138 	atomic_set(&sdp->sd_log_in_flight, 0);
139 	atomic_set(&sdp->sd_reserving_log, 0);
140 	init_waitqueue_head(&sdp->sd_reserving_log_wait);
141 	init_waitqueue_head(&sdp->sd_log_flush_wait);
142 	atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN);
143 	mutex_init(&sdp->sd_freeze_mutex);
144 
145 	return sdp;
146 
147 fail:
148 	free_sbd(sdp);
149 	return NULL;
150 }
151 
152 /**
153  * gfs2_check_sb - Check superblock
154  * @sdp: the filesystem
155  * @sb: The superblock
156  * @silent: Don't print a message if the check fails
157  *
158  * Checks the version code of the FS is one that we understand how to
159  * read and that the sizes of the various on-disk structures have not
160  * changed.
161  */
162 
gfs2_check_sb(struct gfs2_sbd * sdp,int silent)163 static int gfs2_check_sb(struct gfs2_sbd *sdp, int silent)
164 {
165 	struct gfs2_sb_host *sb = &sdp->sd_sb;
166 
167 	if (sb->sb_magic != GFS2_MAGIC ||
168 	    sb->sb_type != GFS2_METATYPE_SB) {
169 		if (!silent)
170 			pr_warn("not a GFS2 filesystem\n");
171 		return -EINVAL;
172 	}
173 
174 	if (sb->sb_fs_format != GFS2_FORMAT_FS ||
175 	    sb->sb_multihost_format != GFS2_FORMAT_MULTI) {
176 		fs_warn(sdp, "Unknown on-disk format, unable to mount\n");
177 		return -EINVAL;
178 	}
179 
180 	if (sb->sb_bsize < 512 || sb->sb_bsize > PAGE_SIZE ||
181 	    (sb->sb_bsize & (sb->sb_bsize - 1))) {
182 		pr_warn("Invalid superblock size\n");
183 		return -EINVAL;
184 	}
185 
186 	return 0;
187 }
188 
end_bio_io_page(struct bio * bio)189 static void end_bio_io_page(struct bio *bio)
190 {
191 	struct page *page = bio->bi_private;
192 
193 	if (!bio->bi_status)
194 		SetPageUptodate(page);
195 	else
196 		pr_warn("error %d reading superblock\n", bio->bi_status);
197 	unlock_page(page);
198 }
199 
gfs2_sb_in(struct gfs2_sbd * sdp,const void * buf)200 static void gfs2_sb_in(struct gfs2_sbd *sdp, const void *buf)
201 {
202 	struct gfs2_sb_host *sb = &sdp->sd_sb;
203 	struct super_block *s = sdp->sd_vfs;
204 	const struct gfs2_sb *str = buf;
205 
206 	sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic);
207 	sb->sb_type = be32_to_cpu(str->sb_header.mh_type);
208 	sb->sb_format = be32_to_cpu(str->sb_header.mh_format);
209 	sb->sb_fs_format = be32_to_cpu(str->sb_fs_format);
210 	sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format);
211 	sb->sb_bsize = be32_to_cpu(str->sb_bsize);
212 	sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift);
213 	sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr);
214 	sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino);
215 	sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr);
216 	sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino);
217 
218 	memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN);
219 	memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN);
220 	memcpy(&s->s_uuid, str->sb_uuid, 16);
221 }
222 
223 /**
224  * gfs2_read_super - Read the gfs2 super block from disk
225  * @sdp: The GFS2 super block
226  * @sector: The location of the super block
227  * @error: The error code to return
228  *
229  * This uses the bio functions to read the super block from disk
230  * because we want to be 100% sure that we never read cached data.
231  * A super block is read twice only during each GFS2 mount and is
232  * never written to by the filesystem. The first time its read no
233  * locks are held, and the only details which are looked at are those
234  * relating to the locking protocol. Once locking is up and working,
235  * the sb is read again under the lock to establish the location of
236  * the master directory (contains pointers to journals etc) and the
237  * root directory.
238  *
239  * Returns: 0 on success or error
240  */
241 
gfs2_read_super(struct gfs2_sbd * sdp,sector_t sector,int silent)242 static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector, int silent)
243 {
244 	struct super_block *sb = sdp->sd_vfs;
245 	struct gfs2_sb *p;
246 	struct page *page;
247 	struct bio *bio;
248 
249 	page = alloc_page(GFP_NOFS);
250 	if (unlikely(!page))
251 		return -ENOMEM;
252 
253 	ClearPageUptodate(page);
254 	ClearPageDirty(page);
255 	lock_page(page);
256 
257 	bio = bio_alloc(GFP_NOFS, 1);
258 	bio->bi_iter.bi_sector = sector * (sb->s_blocksize >> 9);
259 	bio_set_dev(bio, sb->s_bdev);
260 	bio_add_page(bio, page, PAGE_SIZE, 0);
261 
262 	bio->bi_end_io = end_bio_io_page;
263 	bio->bi_private = page;
264 	bio_set_op_attrs(bio, REQ_OP_READ, REQ_META);
265 	submit_bio(bio);
266 	wait_on_page_locked(page);
267 	bio_put(bio);
268 	if (!PageUptodate(page)) {
269 		__free_page(page);
270 		return -EIO;
271 	}
272 	p = kmap(page);
273 	gfs2_sb_in(sdp, p);
274 	kunmap(page);
275 	__free_page(page);
276 	return gfs2_check_sb(sdp, silent);
277 }
278 
279 /**
280  * gfs2_read_sb - Read super block
281  * @sdp: The GFS2 superblock
282  * @silent: Don't print message if mount fails
283  *
284  */
285 
gfs2_read_sb(struct gfs2_sbd * sdp,int silent)286 static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent)
287 {
288 	u32 hash_blocks, ind_blocks, leaf_blocks;
289 	u32 tmp_blocks;
290 	unsigned int x;
291 	int error;
292 
293 	error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
294 	if (error) {
295 		if (!silent)
296 			fs_err(sdp, "can't read superblock\n");
297 		return error;
298 	}
299 
300 	sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
301 			       GFS2_BASIC_BLOCK_SHIFT;
302 	sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift);
303 	sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
304 			  sizeof(struct gfs2_dinode)) / sizeof(u64);
305 	sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
306 			  sizeof(struct gfs2_meta_header)) / sizeof(u64);
307 	sdp->sd_ldptrs = (sdp->sd_sb.sb_bsize -
308 			  sizeof(struct gfs2_log_descriptor)) / sizeof(u64);
309 	sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
310 	sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
311 	sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
312 	sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64);
313 	sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
314 				sizeof(struct gfs2_meta_header)) /
315 			        sizeof(struct gfs2_quota_change);
316 	sdp->sd_blocks_per_bitmap = (sdp->sd_sb.sb_bsize -
317 				     sizeof(struct gfs2_meta_header))
318 		* GFS2_NBBY; /* not the rgrp bitmap, subsequent bitmaps only */
319 
320 	/* Compute maximum reservation required to add a entry to a directory */
321 
322 	hash_blocks = DIV_ROUND_UP(sizeof(u64) * BIT(GFS2_DIR_MAX_DEPTH),
323 			     sdp->sd_jbsize);
324 
325 	ind_blocks = 0;
326 	for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
327 		tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
328 		ind_blocks += tmp_blocks;
329 	}
330 
331 	leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
332 
333 	sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
334 
335 	sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
336 				sizeof(struct gfs2_dinode);
337 	sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
338 	for (x = 2;; x++) {
339 		u64 space, d;
340 		u32 m;
341 
342 		space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
343 		d = space;
344 		m = do_div(d, sdp->sd_inptrs);
345 
346 		if (d != sdp->sd_heightsize[x - 1] || m)
347 			break;
348 		sdp->sd_heightsize[x] = space;
349 	}
350 	sdp->sd_max_height = x;
351 	sdp->sd_heightsize[x] = ~0;
352 	gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
353 
354 	sdp->sd_max_dents_per_leaf = (sdp->sd_sb.sb_bsize -
355 				      sizeof(struct gfs2_leaf)) /
356 				     GFS2_MIN_DIRENT_SIZE;
357 	return 0;
358 }
359 
init_names(struct gfs2_sbd * sdp,int silent)360 static int init_names(struct gfs2_sbd *sdp, int silent)
361 {
362 	char *proto, *table;
363 	int error = 0;
364 
365 	proto = sdp->sd_args.ar_lockproto;
366 	table = sdp->sd_args.ar_locktable;
367 
368 	/*  Try to autodetect  */
369 
370 	if (!proto[0] || !table[0]) {
371 		error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
372 		if (error)
373 			return error;
374 
375 		if (!proto[0])
376 			proto = sdp->sd_sb.sb_lockproto;
377 		if (!table[0])
378 			table = sdp->sd_sb.sb_locktable;
379 	}
380 
381 	if (!table[0])
382 		table = sdp->sd_vfs->s_id;
383 
384 	strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN);
385 	strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN);
386 
387 	table = sdp->sd_table_name;
388 	while ((table = strchr(table, '/')))
389 		*table = '_';
390 
391 	return error;
392 }
393 
init_locking(struct gfs2_sbd * sdp,struct gfs2_holder * mount_gh,int undo)394 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
395 			int undo)
396 {
397 	int error = 0;
398 
399 	if (undo)
400 		goto fail_trans;
401 
402 	error = gfs2_glock_nq_num(sdp,
403 				  GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
404 				  LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
405 				  mount_gh);
406 	if (error) {
407 		fs_err(sdp, "can't acquire mount glock: %d\n", error);
408 		goto fail;
409 	}
410 
411 	error = gfs2_glock_nq_num(sdp,
412 				  GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
413 				  LM_ST_SHARED,
414 				  LM_FLAG_NOEXP | GL_EXACT,
415 				  &sdp->sd_live_gh);
416 	if (error) {
417 		fs_err(sdp, "can't acquire live glock: %d\n", error);
418 		goto fail_mount;
419 	}
420 
421 	error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
422 			       CREATE, &sdp->sd_rename_gl);
423 	if (error) {
424 		fs_err(sdp, "can't create rename glock: %d\n", error);
425 		goto fail_live;
426 	}
427 
428 	error = gfs2_glock_get(sdp, GFS2_FREEZE_LOCK, &gfs2_freeze_glops,
429 			       CREATE, &sdp->sd_freeze_gl);
430 	if (error) {
431 		fs_err(sdp, "can't create transaction glock: %d\n", error);
432 		goto fail_rename;
433 	}
434 
435 	return 0;
436 
437 fail_trans:
438 	gfs2_glock_put(sdp->sd_freeze_gl);
439 fail_rename:
440 	gfs2_glock_put(sdp->sd_rename_gl);
441 fail_live:
442 	gfs2_glock_dq_uninit(&sdp->sd_live_gh);
443 fail_mount:
444 	gfs2_glock_dq_uninit(mount_gh);
445 fail:
446 	return error;
447 }
448 
gfs2_lookup_root(struct super_block * sb,struct dentry ** dptr,u64 no_addr,const char * name)449 static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr,
450 			    u64 no_addr, const char *name)
451 {
452 	struct gfs2_sbd *sdp = sb->s_fs_info;
453 	struct dentry *dentry;
454 	struct inode *inode;
455 
456 	inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0,
457 				  GFS2_BLKST_FREE /* ignore */);
458 	if (IS_ERR(inode)) {
459 		fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode));
460 		return PTR_ERR(inode);
461 	}
462 	dentry = d_make_root(inode);
463 	if (!dentry) {
464 		fs_err(sdp, "can't alloc %s dentry\n", name);
465 		return -ENOMEM;
466 	}
467 	*dptr = dentry;
468 	return 0;
469 }
470 
init_sb(struct gfs2_sbd * sdp,int silent)471 static int init_sb(struct gfs2_sbd *sdp, int silent)
472 {
473 	struct super_block *sb = sdp->sd_vfs;
474 	struct gfs2_holder sb_gh;
475 	u64 no_addr;
476 	int ret;
477 
478 	ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
479 				LM_ST_SHARED, 0, &sb_gh);
480 	if (ret) {
481 		fs_err(sdp, "can't acquire superblock glock: %d\n", ret);
482 		return ret;
483 	}
484 
485 	ret = gfs2_read_sb(sdp, silent);
486 	if (ret) {
487 		fs_err(sdp, "can't read superblock: %d\n", ret);
488 		goto out;
489 	}
490 
491 	/* Set up the buffer cache and SB for real */
492 	if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) {
493 		ret = -EINVAL;
494 		fs_err(sdp, "FS block size (%u) is too small for device "
495 		       "block size (%u)\n",
496 		       sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev));
497 		goto out;
498 	}
499 	if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
500 		ret = -EINVAL;
501 		fs_err(sdp, "FS block size (%u) is too big for machine "
502 		       "page size (%u)\n",
503 		       sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
504 		goto out;
505 	}
506 	sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
507 
508 	/* Get the root inode */
509 	no_addr = sdp->sd_sb.sb_root_dir.no_addr;
510 	ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root");
511 	if (ret)
512 		goto out;
513 
514 	/* Get the master inode */
515 	no_addr = sdp->sd_sb.sb_master_dir.no_addr;
516 	ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master");
517 	if (ret) {
518 		dput(sdp->sd_root_dir);
519 		goto out;
520 	}
521 	sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir);
522 out:
523 	gfs2_glock_dq_uninit(&sb_gh);
524 	return ret;
525 }
526 
gfs2_others_may_mount(struct gfs2_sbd * sdp)527 static void gfs2_others_may_mount(struct gfs2_sbd *sdp)
528 {
529 	char *message = "FIRSTMOUNT=Done";
530 	char *envp[] = { message, NULL };
531 
532 	fs_info(sdp, "first mount done, others may mount\n");
533 
534 	if (sdp->sd_lockstruct.ls_ops->lm_first_done)
535 		sdp->sd_lockstruct.ls_ops->lm_first_done(sdp);
536 
537 	kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp);
538 }
539 
540 /**
541  * gfs2_jindex_hold - Grab a lock on the jindex
542  * @sdp: The GFS2 superblock
543  * @ji_gh: the holder for the jindex glock
544  *
545  * Returns: errno
546  */
547 
gfs2_jindex_hold(struct gfs2_sbd * sdp,struct gfs2_holder * ji_gh)548 static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
549 {
550 	struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex);
551 	struct qstr name;
552 	char buf[20];
553 	struct gfs2_jdesc *jd;
554 	int error;
555 
556 	name.name = buf;
557 
558 	mutex_lock(&sdp->sd_jindex_mutex);
559 
560 	for (;;) {
561 		struct gfs2_inode *jip;
562 
563 		error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh);
564 		if (error)
565 			break;
566 
567 		name.len = sprintf(buf, "journal%u", sdp->sd_journals);
568 		name.hash = gfs2_disk_hash(name.name, name.len);
569 
570 		error = gfs2_dir_check(sdp->sd_jindex, &name, NULL);
571 		if (error == -ENOENT) {
572 			error = 0;
573 			break;
574 		}
575 
576 		gfs2_glock_dq_uninit(ji_gh);
577 
578 		if (error)
579 			break;
580 
581 		error = -ENOMEM;
582 		jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
583 		if (!jd)
584 			break;
585 
586 		INIT_LIST_HEAD(&jd->extent_list);
587 		INIT_LIST_HEAD(&jd->jd_revoke_list);
588 
589 		INIT_WORK(&jd->jd_work, gfs2_recover_func);
590 		jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1);
591 		if (IS_ERR_OR_NULL(jd->jd_inode)) {
592 			if (!jd->jd_inode)
593 				error = -ENOENT;
594 			else
595 				error = PTR_ERR(jd->jd_inode);
596 			kfree(jd);
597 			break;
598 		}
599 
600 		spin_lock(&sdp->sd_jindex_spin);
601 		jd->jd_jid = sdp->sd_journals++;
602 		jip = GFS2_I(jd->jd_inode);
603 		jd->jd_no_addr = jip->i_no_addr;
604 		list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
605 		spin_unlock(&sdp->sd_jindex_spin);
606 	}
607 
608 	mutex_unlock(&sdp->sd_jindex_mutex);
609 
610 	return error;
611 }
612 
613 /**
614  * init_statfs - look up and initialize master and local (per node) statfs inodes
615  * @sdp: The GFS2 superblock
616  *
617  * This should be called after the jindex is initialized in init_journal() and
618  * before gfs2_journal_recovery() is called because we need to be able to write
619  * to these inodes during recovery.
620  *
621  * Returns: errno
622  */
init_statfs(struct gfs2_sbd * sdp)623 static int init_statfs(struct gfs2_sbd *sdp)
624 {
625 	int error = 0;
626 	struct inode *master = d_inode(sdp->sd_master_dir);
627 	struct inode *pn = NULL;
628 	char buf[30];
629 	struct gfs2_jdesc *jd;
630 	struct gfs2_inode *ip;
631 
632 	sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs");
633 	if (IS_ERR(sdp->sd_statfs_inode)) {
634 		error = PTR_ERR(sdp->sd_statfs_inode);
635 		fs_err(sdp, "can't read in statfs inode: %d\n", error);
636 		goto out;
637 	}
638 	if (sdp->sd_args.ar_spectator)
639 		goto out;
640 
641 	pn = gfs2_lookup_simple(master, "per_node");
642 	if (IS_ERR(pn)) {
643 		error = PTR_ERR(pn);
644 		fs_err(sdp, "can't find per_node directory: %d\n", error);
645 		goto put_statfs;
646 	}
647 
648 	/* For each jid, lookup the corresponding local statfs inode in the
649 	 * per_node metafs directory and save it in the sdp->sd_sc_inodes_list. */
650 	list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
651 		struct local_statfs_inode *lsi =
652 			kmalloc(sizeof(struct local_statfs_inode), GFP_NOFS);
653 		if (!lsi) {
654 			error = -ENOMEM;
655 			goto free_local;
656 		}
657 		sprintf(buf, "statfs_change%u", jd->jd_jid);
658 		lsi->si_sc_inode = gfs2_lookup_simple(pn, buf);
659 		if (IS_ERR(lsi->si_sc_inode)) {
660 			error = PTR_ERR(lsi->si_sc_inode);
661 			fs_err(sdp, "can't find local \"sc\" file#%u: %d\n",
662 			       jd->jd_jid, error);
663 			kfree(lsi);
664 			goto free_local;
665 		}
666 		lsi->si_jid = jd->jd_jid;
667 		if (jd->jd_jid == sdp->sd_jdesc->jd_jid)
668 			sdp->sd_sc_inode = lsi->si_sc_inode;
669 
670 		list_add_tail(&lsi->si_list, &sdp->sd_sc_inodes_list);
671 	}
672 
673 	iput(pn);
674 	pn = NULL;
675 	ip = GFS2_I(sdp->sd_sc_inode);
676 	error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
677 				   &sdp->sd_sc_gh);
678 	if (error) {
679 		fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
680 		goto free_local;
681 	}
682 	return 0;
683 
684 free_local:
685 	free_local_statfs_inodes(sdp);
686 	iput(pn);
687 put_statfs:
688 	iput(sdp->sd_statfs_inode);
689 out:
690 	return error;
691 }
692 
693 /* Uninitialize and free up memory used by the list of statfs inodes */
uninit_statfs(struct gfs2_sbd * sdp)694 static void uninit_statfs(struct gfs2_sbd *sdp)
695 {
696 	if (!sdp->sd_args.ar_spectator) {
697 		gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
698 		free_local_statfs_inodes(sdp);
699 	}
700 	iput(sdp->sd_statfs_inode);
701 }
702 
init_journal(struct gfs2_sbd * sdp,int undo)703 static int init_journal(struct gfs2_sbd *sdp, int undo)
704 {
705 	struct inode *master = d_inode(sdp->sd_master_dir);
706 	struct gfs2_holder ji_gh;
707 	struct gfs2_inode *ip;
708 	int jindex = 1;
709 	int error = 0;
710 
711 	if (undo) {
712 		jindex = 0;
713 		goto fail_statfs;
714 	}
715 
716 	sdp->sd_jindex = gfs2_lookup_simple(master, "jindex");
717 	if (IS_ERR(sdp->sd_jindex)) {
718 		fs_err(sdp, "can't lookup journal index: %d\n", error);
719 		return PTR_ERR(sdp->sd_jindex);
720 	}
721 
722 	/* Load in the journal index special file */
723 
724 	error = gfs2_jindex_hold(sdp, &ji_gh);
725 	if (error) {
726 		fs_err(sdp, "can't read journal index: %d\n", error);
727 		goto fail;
728 	}
729 
730 	error = -EUSERS;
731 	if (!gfs2_jindex_size(sdp)) {
732 		fs_err(sdp, "no journals!\n");
733 		goto fail_jindex;
734 	}
735 
736 	atomic_set(&sdp->sd_log_blks_needed, 0);
737 	if (sdp->sd_args.ar_spectator) {
738 		sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
739 		atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
740 		atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
741 		atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
742 	} else {
743 		if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
744 			fs_err(sdp, "can't mount journal #%u\n",
745 			       sdp->sd_lockstruct.ls_jid);
746 			fs_err(sdp, "there are only %u journals (0 - %u)\n",
747 			       gfs2_jindex_size(sdp),
748 			       gfs2_jindex_size(sdp) - 1);
749 			goto fail_jindex;
750 		}
751 		sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
752 
753 		error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
754 					  &gfs2_journal_glops,
755 					  LM_ST_EXCLUSIVE,
756 					  LM_FLAG_NOEXP | GL_NOCACHE,
757 					  &sdp->sd_journal_gh);
758 		if (error) {
759 			fs_err(sdp, "can't acquire journal glock: %d\n", error);
760 			goto fail_jindex;
761 		}
762 
763 		ip = GFS2_I(sdp->sd_jdesc->jd_inode);
764 		sdp->sd_jinode_gl = ip->i_gl;
765 		error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
766 					   LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE,
767 					   &sdp->sd_jinode_gh);
768 		if (error) {
769 			fs_err(sdp, "can't acquire journal inode glock: %d\n",
770 			       error);
771 			goto fail_journal_gh;
772 		}
773 
774 		error = gfs2_jdesc_check(sdp->sd_jdesc);
775 		if (error) {
776 			fs_err(sdp, "my journal (%u) is bad: %d\n",
777 			       sdp->sd_jdesc->jd_jid, error);
778 			goto fail_jinode_gh;
779 		}
780 		atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
781 		atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
782 		atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
783 
784 		/* Map the extents for this journal's blocks */
785 		gfs2_map_journal_extents(sdp, sdp->sd_jdesc);
786 	}
787 	trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free));
788 
789 	/* Lookup statfs inodes here so journal recovery can use them. */
790 	error = init_statfs(sdp);
791 	if (error)
792 		goto fail_jinode_gh;
793 
794 	if (sdp->sd_lockstruct.ls_first) {
795 		unsigned int x;
796 		for (x = 0; x < sdp->sd_journals; x++) {
797 			struct gfs2_jdesc *jd = gfs2_jdesc_find(sdp, x);
798 
799 			if (sdp->sd_args.ar_spectator) {
800 				error = check_journal_clean(sdp, jd, true);
801 				if (error)
802 					goto fail_statfs;
803 				continue;
804 			}
805 			error = gfs2_recover_journal(jd, true);
806 			if (error) {
807 				fs_err(sdp, "error recovering journal %u: %d\n",
808 				       x, error);
809 				goto fail_statfs;
810 			}
811 		}
812 
813 		gfs2_others_may_mount(sdp);
814 	} else if (!sdp->sd_args.ar_spectator) {
815 		error = gfs2_recover_journal(sdp->sd_jdesc, true);
816 		if (error) {
817 			fs_err(sdp, "error recovering my journal: %d\n", error);
818 			goto fail_statfs;
819 		}
820 	}
821 
822 	sdp->sd_log_idle = 1;
823 	set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
824 	gfs2_glock_dq_uninit(&ji_gh);
825 	jindex = 0;
826 	INIT_WORK(&sdp->sd_freeze_work, gfs2_freeze_func);
827 	return 0;
828 
829 fail_statfs:
830 	uninit_statfs(sdp);
831 fail_jinode_gh:
832 	/* A withdraw may have done dq/uninit so now we need to check it */
833 	if (!sdp->sd_args.ar_spectator &&
834 	    gfs2_holder_initialized(&sdp->sd_jinode_gh))
835 		gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
836 fail_journal_gh:
837 	if (!sdp->sd_args.ar_spectator &&
838 	    gfs2_holder_initialized(&sdp->sd_journal_gh))
839 		gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
840 fail_jindex:
841 	gfs2_jindex_free(sdp);
842 	if (jindex)
843 		gfs2_glock_dq_uninit(&ji_gh);
844 fail:
845 	iput(sdp->sd_jindex);
846 	return error;
847 }
848 
849 static struct lock_class_key gfs2_quota_imutex_key;
850 
init_inodes(struct gfs2_sbd * sdp,int undo)851 static int init_inodes(struct gfs2_sbd *sdp, int undo)
852 {
853 	int error = 0;
854 	struct inode *master = d_inode(sdp->sd_master_dir);
855 
856 	if (undo)
857 		goto fail_qinode;
858 
859 	error = init_journal(sdp, undo);
860 	complete_all(&sdp->sd_journal_ready);
861 	if (error)
862 		goto fail;
863 
864 	/* Read in the resource index inode */
865 	sdp->sd_rindex = gfs2_lookup_simple(master, "rindex");
866 	if (IS_ERR(sdp->sd_rindex)) {
867 		error = PTR_ERR(sdp->sd_rindex);
868 		fs_err(sdp, "can't get resource index inode: %d\n", error);
869 		goto fail_journal;
870 	}
871 	sdp->sd_rindex_uptodate = 0;
872 
873 	/* Read in the quota inode */
874 	sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota");
875 	if (IS_ERR(sdp->sd_quota_inode)) {
876 		error = PTR_ERR(sdp->sd_quota_inode);
877 		fs_err(sdp, "can't get quota file inode: %d\n", error);
878 		goto fail_rindex;
879 	}
880 	/*
881 	 * i_rwsem on quota files is special. Since this inode is hidden system
882 	 * file, we are safe to define locking ourselves.
883 	 */
884 	lockdep_set_class(&sdp->sd_quota_inode->i_rwsem,
885 			  &gfs2_quota_imutex_key);
886 
887 	error = gfs2_rindex_update(sdp);
888 	if (error)
889 		goto fail_qinode;
890 
891 	return 0;
892 
893 fail_qinode:
894 	iput(sdp->sd_quota_inode);
895 fail_rindex:
896 	gfs2_clear_rgrpd(sdp);
897 	iput(sdp->sd_rindex);
898 fail_journal:
899 	init_journal(sdp, UNDO);
900 fail:
901 	return error;
902 }
903 
init_per_node(struct gfs2_sbd * sdp,int undo)904 static int init_per_node(struct gfs2_sbd *sdp, int undo)
905 {
906 	struct inode *pn = NULL;
907 	char buf[30];
908 	int error = 0;
909 	struct gfs2_inode *ip;
910 	struct inode *master = d_inode(sdp->sd_master_dir);
911 
912 	if (sdp->sd_args.ar_spectator)
913 		return 0;
914 
915 	if (undo)
916 		goto fail_qc_gh;
917 
918 	pn = gfs2_lookup_simple(master, "per_node");
919 	if (IS_ERR(pn)) {
920 		error = PTR_ERR(pn);
921 		fs_err(sdp, "can't find per_node directory: %d\n", error);
922 		return error;
923 	}
924 
925 	sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
926 	sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
927 	if (IS_ERR(sdp->sd_qc_inode)) {
928 		error = PTR_ERR(sdp->sd_qc_inode);
929 		fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
930 		goto fail_ut_i;
931 	}
932 
933 	iput(pn);
934 	pn = NULL;
935 
936 	ip = GFS2_I(sdp->sd_qc_inode);
937 	error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
938 				   &sdp->sd_qc_gh);
939 	if (error) {
940 		fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
941 		goto fail_qc_i;
942 	}
943 
944 	return 0;
945 
946 fail_qc_gh:
947 	gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
948 fail_qc_i:
949 	iput(sdp->sd_qc_inode);
950 fail_ut_i:
951 	iput(pn);
952 	return error;
953 }
954 
955 static const match_table_t nolock_tokens = {
956 	{ Opt_jid, "jid=%d", },
957 	{ Opt_err, NULL },
958 };
959 
960 static const struct lm_lockops nolock_ops = {
961 	.lm_proto_name = "lock_nolock",
962 	.lm_put_lock = gfs2_glock_free,
963 	.lm_tokens = &nolock_tokens,
964 };
965 
966 /**
967  * gfs2_lm_mount - mount a locking protocol
968  * @sdp: the filesystem
969  * @args: mount arguments
970  * @silent: if 1, don't complain if the FS isn't a GFS2 fs
971  *
972  * Returns: errno
973  */
974 
gfs2_lm_mount(struct gfs2_sbd * sdp,int silent)975 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
976 {
977 	const struct lm_lockops *lm;
978 	struct lm_lockstruct *ls = &sdp->sd_lockstruct;
979 	struct gfs2_args *args = &sdp->sd_args;
980 	const char *proto = sdp->sd_proto_name;
981 	const char *table = sdp->sd_table_name;
982 	char *o, *options;
983 	int ret;
984 
985 	if (!strcmp("lock_nolock", proto)) {
986 		lm = &nolock_ops;
987 		sdp->sd_args.ar_localflocks = 1;
988 #ifdef CONFIG_GFS2_FS_LOCKING_DLM
989 	} else if (!strcmp("lock_dlm", proto)) {
990 		lm = &gfs2_dlm_ops;
991 #endif
992 	} else {
993 		pr_info("can't find protocol %s\n", proto);
994 		return -ENOENT;
995 	}
996 
997 	fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
998 
999 	ls->ls_ops = lm;
1000 	ls->ls_first = 1;
1001 
1002 	for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) {
1003 		substring_t tmp[MAX_OPT_ARGS];
1004 		int token, option;
1005 
1006 		if (!o || !*o)
1007 			continue;
1008 
1009 		token = match_token(o, *lm->lm_tokens, tmp);
1010 		switch (token) {
1011 		case Opt_jid:
1012 			ret = match_int(&tmp[0], &option);
1013 			if (ret || option < 0)
1014 				goto hostdata_error;
1015 			if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags))
1016 				ls->ls_jid = option;
1017 			break;
1018 		case Opt_id:
1019 		case Opt_nodir:
1020 			/* Obsolete, but left for backward compat purposes */
1021 			break;
1022 		case Opt_first:
1023 			ret = match_int(&tmp[0], &option);
1024 			if (ret || (option != 0 && option != 1))
1025 				goto hostdata_error;
1026 			ls->ls_first = option;
1027 			break;
1028 		case Opt_err:
1029 		default:
1030 hostdata_error:
1031 			fs_info(sdp, "unknown hostdata (%s)\n", o);
1032 			return -EINVAL;
1033 		}
1034 	}
1035 
1036 	if (lm->lm_mount == NULL) {
1037 		fs_info(sdp, "Now mounting FS...\n");
1038 		complete_all(&sdp->sd_locking_init);
1039 		return 0;
1040 	}
1041 	ret = lm->lm_mount(sdp, table);
1042 	if (ret == 0)
1043 		fs_info(sdp, "Joined cluster. Now mounting FS...\n");
1044 	complete_all(&sdp->sd_locking_init);
1045 	return ret;
1046 }
1047 
gfs2_lm_unmount(struct gfs2_sbd * sdp)1048 void gfs2_lm_unmount(struct gfs2_sbd *sdp)
1049 {
1050 	const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops;
1051 	if (likely(!gfs2_withdrawn(sdp)) && lm->lm_unmount)
1052 		lm->lm_unmount(sdp);
1053 }
1054 
wait_on_journal(struct gfs2_sbd * sdp)1055 static int wait_on_journal(struct gfs2_sbd *sdp)
1056 {
1057 	if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
1058 		return 0;
1059 
1060 	return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, TASK_INTERRUPTIBLE)
1061 		? -EINTR : 0;
1062 }
1063 
gfs2_online_uevent(struct gfs2_sbd * sdp)1064 void gfs2_online_uevent(struct gfs2_sbd *sdp)
1065 {
1066 	struct super_block *sb = sdp->sd_vfs;
1067 	char ro[20];
1068 	char spectator[20];
1069 	char *envp[] = { ro, spectator, NULL };
1070 	sprintf(ro, "RDONLY=%d", sb_rdonly(sb));
1071 	sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
1072 	kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp);
1073 }
1074 
init_threads(struct gfs2_sbd * sdp)1075 static int init_threads(struct gfs2_sbd *sdp)
1076 {
1077 	struct task_struct *p;
1078 	int error = 0;
1079 
1080 	p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
1081 	if (IS_ERR(p)) {
1082 		error = PTR_ERR(p);
1083 		fs_err(sdp, "can't start logd thread: %d\n", error);
1084 		return error;
1085 	}
1086 	sdp->sd_logd_process = p;
1087 
1088 	p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
1089 	if (IS_ERR(p)) {
1090 		error = PTR_ERR(p);
1091 		fs_err(sdp, "can't start quotad thread: %d\n", error);
1092 		goto fail;
1093 	}
1094 	sdp->sd_quotad_process = p;
1095 	return 0;
1096 
1097 fail:
1098 	kthread_stop(sdp->sd_logd_process);
1099 	sdp->sd_logd_process = NULL;
1100 	return error;
1101 }
1102 
1103 /**
1104  * gfs2_fill_super - Read in superblock
1105  * @sb: The VFS superblock
1106  * @args: Mount options
1107  * @silent: Don't complain if it's not a GFS2 filesystem
1108  *
1109  * Returns: -errno
1110  */
gfs2_fill_super(struct super_block * sb,struct fs_context * fc)1111 static int gfs2_fill_super(struct super_block *sb, struct fs_context *fc)
1112 {
1113 	struct gfs2_args *args = fc->fs_private;
1114 	int silent = fc->sb_flags & SB_SILENT;
1115 	struct gfs2_sbd *sdp;
1116 	struct gfs2_holder mount_gh;
1117 	struct gfs2_holder freeze_gh;
1118 	int error;
1119 
1120 	sdp = init_sbd(sb);
1121 	if (!sdp) {
1122 		pr_warn("can't alloc struct gfs2_sbd\n");
1123 		return -ENOMEM;
1124 	}
1125 	sdp->sd_args = *args;
1126 
1127 	if (sdp->sd_args.ar_spectator) {
1128                 sb->s_flags |= SB_RDONLY;
1129 		set_bit(SDF_RORECOVERY, &sdp->sd_flags);
1130 	}
1131 	if (sdp->sd_args.ar_posix_acl)
1132 		sb->s_flags |= SB_POSIXACL;
1133 	if (sdp->sd_args.ar_nobarrier)
1134 		set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1135 
1136 	sb->s_flags |= SB_NOSEC;
1137 	sb->s_magic = GFS2_MAGIC;
1138 	sb->s_op = &gfs2_super_ops;
1139 	sb->s_d_op = &gfs2_dops;
1140 	sb->s_export_op = &gfs2_export_ops;
1141 	sb->s_xattr = gfs2_xattr_handlers;
1142 	sb->s_qcop = &gfs2_quotactl_ops;
1143 	sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1144 	sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
1145 	sb->s_time_gran = 1;
1146 	sb->s_maxbytes = MAX_LFS_FILESIZE;
1147 
1148 	/* Set up the buffer cache and fill in some fake block size values
1149 	   to allow us to read-in the on-disk superblock. */
1150 	sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
1151 	sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
1152 	sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
1153                                GFS2_BASIC_BLOCK_SHIFT;
1154 	sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift);
1155 
1156 	sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit;
1157 	sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum;
1158 	if (sdp->sd_args.ar_statfs_quantum) {
1159 		sdp->sd_tune.gt_statfs_slow = 0;
1160 		sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum;
1161 	} else {
1162 		sdp->sd_tune.gt_statfs_slow = 1;
1163 		sdp->sd_tune.gt_statfs_quantum = 30;
1164 	}
1165 
1166 	error = init_names(sdp, silent);
1167 	if (error)
1168 		goto fail_free;
1169 
1170 	snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s", sdp->sd_table_name);
1171 
1172 	error = gfs2_sys_fs_add(sdp);
1173 	if (error)
1174 		goto fail_free;
1175 
1176 	gfs2_create_debugfs_file(sdp);
1177 
1178 	error = gfs2_lm_mount(sdp, silent);
1179 	if (error)
1180 		goto fail_debug;
1181 
1182 	error = init_locking(sdp, &mount_gh, DO);
1183 	if (error)
1184 		goto fail_lm;
1185 
1186 	error = init_sb(sdp, silent);
1187 	if (error)
1188 		goto fail_locking;
1189 
1190 	error = wait_on_journal(sdp);
1191 	if (error)
1192 		goto fail_sb;
1193 
1194 	/*
1195 	 * If user space has failed to join the cluster or some similar
1196 	 * failure has occurred, then the journal id will contain a
1197 	 * negative (error) number. This will then be returned to the
1198 	 * caller (of the mount syscall). We do this even for spectator
1199 	 * mounts (which just write a jid of 0 to indicate "ok" even though
1200 	 * the jid is unused in the spectator case)
1201 	 */
1202 	if (sdp->sd_lockstruct.ls_jid < 0) {
1203 		error = sdp->sd_lockstruct.ls_jid;
1204 		sdp->sd_lockstruct.ls_jid = 0;
1205 		goto fail_sb;
1206 	}
1207 
1208 	if (sdp->sd_args.ar_spectator)
1209 		snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.s",
1210 			 sdp->sd_table_name);
1211 	else
1212 		snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.%u",
1213 			 sdp->sd_table_name, sdp->sd_lockstruct.ls_jid);
1214 
1215 	error = init_inodes(sdp, DO);
1216 	if (error)
1217 		goto fail_sb;
1218 
1219 	error = init_per_node(sdp, DO);
1220 	if (error)
1221 		goto fail_inodes;
1222 
1223 	error = gfs2_statfs_init(sdp);
1224 	if (error) {
1225 		fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
1226 		goto fail_per_node;
1227 	}
1228 
1229 	if (!sb_rdonly(sb)) {
1230 		error = init_threads(sdp);
1231 		if (error) {
1232 			gfs2_withdraw_delayed(sdp);
1233 			goto fail_per_node;
1234 		}
1235 	}
1236 
1237 	error = gfs2_freeze_lock(sdp, &freeze_gh, 0);
1238 	if (error)
1239 		goto fail_per_node;
1240 
1241 	if (!sb_rdonly(sb))
1242 		error = gfs2_make_fs_rw(sdp);
1243 
1244 	gfs2_freeze_unlock(&freeze_gh);
1245 	if (error) {
1246 		if (sdp->sd_quotad_process)
1247 			kthread_stop(sdp->sd_quotad_process);
1248 		sdp->sd_quotad_process = NULL;
1249 		if (sdp->sd_logd_process)
1250 			kthread_stop(sdp->sd_logd_process);
1251 		sdp->sd_logd_process = NULL;
1252 		fs_err(sdp, "can't make FS RW: %d\n", error);
1253 		goto fail_per_node;
1254 	}
1255 	gfs2_glock_dq_uninit(&mount_gh);
1256 	gfs2_online_uevent(sdp);
1257 	return 0;
1258 
1259 fail_per_node:
1260 	init_per_node(sdp, UNDO);
1261 fail_inodes:
1262 	init_inodes(sdp, UNDO);
1263 fail_sb:
1264 	if (sdp->sd_root_dir)
1265 		dput(sdp->sd_root_dir);
1266 	if (sdp->sd_master_dir)
1267 		dput(sdp->sd_master_dir);
1268 	if (sb->s_root)
1269 		dput(sb->s_root);
1270 	sb->s_root = NULL;
1271 fail_locking:
1272 	init_locking(sdp, &mount_gh, UNDO);
1273 fail_lm:
1274 	complete_all(&sdp->sd_journal_ready);
1275 	gfs2_gl_hash_clear(sdp);
1276 	gfs2_lm_unmount(sdp);
1277 fail_debug:
1278 	gfs2_delete_debugfs_file(sdp);
1279 	gfs2_sys_fs_del(sdp);
1280 fail_free:
1281 	free_sbd(sdp);
1282 	sb->s_fs_info = NULL;
1283 	return error;
1284 }
1285 
1286 /**
1287  * gfs2_get_tree - Get the GFS2 superblock and root directory
1288  * @fc: The filesystem context
1289  *
1290  * Returns: 0 or -errno on error
1291  */
gfs2_get_tree(struct fs_context * fc)1292 static int gfs2_get_tree(struct fs_context *fc)
1293 {
1294 	struct gfs2_args *args = fc->fs_private;
1295 	struct gfs2_sbd *sdp;
1296 	int error;
1297 
1298 	error = get_tree_bdev(fc, gfs2_fill_super);
1299 	if (error)
1300 		return error;
1301 
1302 	sdp = fc->root->d_sb->s_fs_info;
1303 	dput(fc->root);
1304 	if (args->ar_meta)
1305 		fc->root = dget(sdp->sd_master_dir);
1306 	else
1307 		fc->root = dget(sdp->sd_root_dir);
1308 	return 0;
1309 }
1310 
gfs2_fc_free(struct fs_context * fc)1311 static void gfs2_fc_free(struct fs_context *fc)
1312 {
1313 	struct gfs2_args *args = fc->fs_private;
1314 
1315 	kfree(args);
1316 }
1317 
1318 enum gfs2_param {
1319 	Opt_lockproto,
1320 	Opt_locktable,
1321 	Opt_hostdata,
1322 	Opt_spectator,
1323 	Opt_ignore_local_fs,
1324 	Opt_localflocks,
1325 	Opt_localcaching,
1326 	Opt_debug,
1327 	Opt_upgrade,
1328 	Opt_acl,
1329 	Opt_quota,
1330 	Opt_quota_flag,
1331 	Opt_suiddir,
1332 	Opt_data,
1333 	Opt_meta,
1334 	Opt_discard,
1335 	Opt_commit,
1336 	Opt_errors,
1337 	Opt_statfs_quantum,
1338 	Opt_statfs_percent,
1339 	Opt_quota_quantum,
1340 	Opt_barrier,
1341 	Opt_rgrplvb,
1342 	Opt_loccookie,
1343 };
1344 
1345 static const struct constant_table gfs2_param_quota[] = {
1346 	{"off",        GFS2_QUOTA_OFF},
1347 	{"account",    GFS2_QUOTA_ACCOUNT},
1348 	{"on",         GFS2_QUOTA_ON},
1349 	{}
1350 };
1351 
1352 enum opt_data {
1353 	Opt_data_writeback = GFS2_DATA_WRITEBACK,
1354 	Opt_data_ordered   = GFS2_DATA_ORDERED,
1355 };
1356 
1357 static const struct constant_table gfs2_param_data[] = {
1358 	{"writeback",  Opt_data_writeback },
1359 	{"ordered",    Opt_data_ordered },
1360 	{}
1361 };
1362 
1363 enum opt_errors {
1364 	Opt_errors_withdraw = GFS2_ERRORS_WITHDRAW,
1365 	Opt_errors_panic    = GFS2_ERRORS_PANIC,
1366 };
1367 
1368 static const struct constant_table gfs2_param_errors[] = {
1369 	{"withdraw",   Opt_errors_withdraw },
1370 	{"panic",      Opt_errors_panic },
1371 	{}
1372 };
1373 
1374 static const struct fs_parameter_spec gfs2_fs_parameters[] = {
1375 	fsparam_string ("lockproto",          Opt_lockproto),
1376 	fsparam_string ("locktable",          Opt_locktable),
1377 	fsparam_string ("hostdata",           Opt_hostdata),
1378 	fsparam_flag   ("spectator",          Opt_spectator),
1379 	fsparam_flag   ("norecovery",         Opt_spectator),
1380 	fsparam_flag   ("ignore_local_fs",    Opt_ignore_local_fs),
1381 	fsparam_flag   ("localflocks",        Opt_localflocks),
1382 	fsparam_flag   ("localcaching",       Opt_localcaching),
1383 	fsparam_flag_no("debug",              Opt_debug),
1384 	fsparam_flag   ("upgrade",            Opt_upgrade),
1385 	fsparam_flag_no("acl",                Opt_acl),
1386 	fsparam_flag_no("suiddir",            Opt_suiddir),
1387 	fsparam_enum   ("data",               Opt_data, gfs2_param_data),
1388 	fsparam_flag   ("meta",               Opt_meta),
1389 	fsparam_flag_no("discard",            Opt_discard),
1390 	fsparam_s32    ("commit",             Opt_commit),
1391 	fsparam_enum   ("errors",             Opt_errors, gfs2_param_errors),
1392 	fsparam_s32    ("statfs_quantum",     Opt_statfs_quantum),
1393 	fsparam_s32    ("statfs_percent",     Opt_statfs_percent),
1394 	fsparam_s32    ("quota_quantum",      Opt_quota_quantum),
1395 	fsparam_flag_no("barrier",            Opt_barrier),
1396 	fsparam_flag_no("rgrplvb",            Opt_rgrplvb),
1397 	fsparam_flag_no("loccookie",          Opt_loccookie),
1398 	/* quota can be a flag or an enum so it gets special treatment */
1399 	fsparam_flag_no("quota",	      Opt_quota_flag),
1400 	fsparam_enum("quota",		      Opt_quota, gfs2_param_quota),
1401 	{}
1402 };
1403 
1404 /* Parse a single mount parameter */
gfs2_parse_param(struct fs_context * fc,struct fs_parameter * param)1405 static int gfs2_parse_param(struct fs_context *fc, struct fs_parameter *param)
1406 {
1407 	struct gfs2_args *args = fc->fs_private;
1408 	struct fs_parse_result result;
1409 	int o;
1410 
1411 	o = fs_parse(fc, gfs2_fs_parameters, param, &result);
1412 	if (o < 0)
1413 		return o;
1414 
1415 	switch (o) {
1416 	case Opt_lockproto:
1417 		strlcpy(args->ar_lockproto, param->string, GFS2_LOCKNAME_LEN);
1418 		break;
1419 	case Opt_locktable:
1420 		strlcpy(args->ar_locktable, param->string, GFS2_LOCKNAME_LEN);
1421 		break;
1422 	case Opt_hostdata:
1423 		strlcpy(args->ar_hostdata, param->string, GFS2_LOCKNAME_LEN);
1424 		break;
1425 	case Opt_spectator:
1426 		args->ar_spectator = 1;
1427 		break;
1428 	case Opt_ignore_local_fs:
1429 		/* Retained for backwards compat only */
1430 		break;
1431 	case Opt_localflocks:
1432 		args->ar_localflocks = 1;
1433 		break;
1434 	case Opt_localcaching:
1435 		/* Retained for backwards compat only */
1436 		break;
1437 	case Opt_debug:
1438 		if (result.boolean && args->ar_errors == GFS2_ERRORS_PANIC)
1439 			return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive");
1440 		args->ar_debug = result.boolean;
1441 		break;
1442 	case Opt_upgrade:
1443 		/* Retained for backwards compat only */
1444 		break;
1445 	case Opt_acl:
1446 		args->ar_posix_acl = result.boolean;
1447 		break;
1448 	case Opt_quota_flag:
1449 		args->ar_quota = result.negated ? GFS2_QUOTA_OFF : GFS2_QUOTA_ON;
1450 		break;
1451 	case Opt_quota:
1452 		args->ar_quota = result.int_32;
1453 		break;
1454 	case Opt_suiddir:
1455 		args->ar_suiddir = result.boolean;
1456 		break;
1457 	case Opt_data:
1458 		/* The uint_32 result maps directly to GFS2_DATA_* */
1459 		args->ar_data = result.uint_32;
1460 		break;
1461 	case Opt_meta:
1462 		args->ar_meta = 1;
1463 		break;
1464 	case Opt_discard:
1465 		args->ar_discard = result.boolean;
1466 		break;
1467 	case Opt_commit:
1468 		if (result.int_32 <= 0)
1469 			return invalfc(fc, "commit mount option requires a positive numeric argument");
1470 		args->ar_commit = result.int_32;
1471 		break;
1472 	case Opt_statfs_quantum:
1473 		if (result.int_32 < 0)
1474 			return invalfc(fc, "statfs_quantum mount option requires a non-negative numeric argument");
1475 		args->ar_statfs_quantum = result.int_32;
1476 		break;
1477 	case Opt_quota_quantum:
1478 		if (result.int_32 <= 0)
1479 			return invalfc(fc, "quota_quantum mount option requires a positive numeric argument");
1480 		args->ar_quota_quantum = result.int_32;
1481 		break;
1482 	case Opt_statfs_percent:
1483 		if (result.int_32 < 0 || result.int_32 > 100)
1484 			return invalfc(fc, "statfs_percent mount option requires a numeric argument between 0 and 100");
1485 		args->ar_statfs_percent = result.int_32;
1486 		break;
1487 	case Opt_errors:
1488 		if (args->ar_debug && result.uint_32 == GFS2_ERRORS_PANIC)
1489 			return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive");
1490 		args->ar_errors = result.uint_32;
1491 		break;
1492 	case Opt_barrier:
1493 		args->ar_nobarrier = result.boolean;
1494 		break;
1495 	case Opt_rgrplvb:
1496 		args->ar_rgrplvb = result.boolean;
1497 		break;
1498 	case Opt_loccookie:
1499 		args->ar_loccookie = result.boolean;
1500 		break;
1501 	default:
1502 		return invalfc(fc, "invalid mount option: %s", param->key);
1503 	}
1504 	return 0;
1505 }
1506 
gfs2_reconfigure(struct fs_context * fc)1507 static int gfs2_reconfigure(struct fs_context *fc)
1508 {
1509 	struct super_block *sb = fc->root->d_sb;
1510 	struct gfs2_sbd *sdp = sb->s_fs_info;
1511 	struct gfs2_args *oldargs = &sdp->sd_args;
1512 	struct gfs2_args *newargs = fc->fs_private;
1513 	struct gfs2_tune *gt = &sdp->sd_tune;
1514 	int error = 0;
1515 
1516 	sync_filesystem(sb);
1517 
1518 	spin_lock(&gt->gt_spin);
1519 	oldargs->ar_commit = gt->gt_logd_secs;
1520 	oldargs->ar_quota_quantum = gt->gt_quota_quantum;
1521 	if (gt->gt_statfs_slow)
1522 		oldargs->ar_statfs_quantum = 0;
1523 	else
1524 		oldargs->ar_statfs_quantum = gt->gt_statfs_quantum;
1525 	spin_unlock(&gt->gt_spin);
1526 
1527 	if (strcmp(newargs->ar_lockproto, oldargs->ar_lockproto)) {
1528 		errorfc(fc, "reconfiguration of locking protocol not allowed");
1529 		return -EINVAL;
1530 	}
1531 	if (strcmp(newargs->ar_locktable, oldargs->ar_locktable)) {
1532 		errorfc(fc, "reconfiguration of lock table not allowed");
1533 		return -EINVAL;
1534 	}
1535 	if (strcmp(newargs->ar_hostdata, oldargs->ar_hostdata)) {
1536 		errorfc(fc, "reconfiguration of host data not allowed");
1537 		return -EINVAL;
1538 	}
1539 	if (newargs->ar_spectator != oldargs->ar_spectator) {
1540 		errorfc(fc, "reconfiguration of spectator mode not allowed");
1541 		return -EINVAL;
1542 	}
1543 	if (newargs->ar_localflocks != oldargs->ar_localflocks) {
1544 		errorfc(fc, "reconfiguration of localflocks not allowed");
1545 		return -EINVAL;
1546 	}
1547 	if (newargs->ar_meta != oldargs->ar_meta) {
1548 		errorfc(fc, "switching between gfs2 and gfs2meta not allowed");
1549 		return -EINVAL;
1550 	}
1551 	if (oldargs->ar_spectator)
1552 		fc->sb_flags |= SB_RDONLY;
1553 
1554 	if ((sb->s_flags ^ fc->sb_flags) & SB_RDONLY) {
1555 		struct gfs2_holder freeze_gh;
1556 
1557 		error = gfs2_freeze_lock(sdp, &freeze_gh, 0);
1558 		if (error)
1559 			return -EINVAL;
1560 
1561 		if (fc->sb_flags & SB_RDONLY) {
1562 			error = gfs2_make_fs_ro(sdp);
1563 			if (error)
1564 				errorfc(fc, "unable to remount read-only");
1565 		} else {
1566 			error = gfs2_make_fs_rw(sdp);
1567 			if (error)
1568 				errorfc(fc, "unable to remount read-write");
1569 		}
1570 		gfs2_freeze_unlock(&freeze_gh);
1571 	}
1572 	sdp->sd_args = *newargs;
1573 
1574 	if (sdp->sd_args.ar_posix_acl)
1575 		sb->s_flags |= SB_POSIXACL;
1576 	else
1577 		sb->s_flags &= ~SB_POSIXACL;
1578 	if (sdp->sd_args.ar_nobarrier)
1579 		set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1580 	else
1581 		clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1582 	spin_lock(&gt->gt_spin);
1583 	gt->gt_logd_secs = newargs->ar_commit;
1584 	gt->gt_quota_quantum = newargs->ar_quota_quantum;
1585 	if (newargs->ar_statfs_quantum) {
1586 		gt->gt_statfs_slow = 0;
1587 		gt->gt_statfs_quantum = newargs->ar_statfs_quantum;
1588 	}
1589 	else {
1590 		gt->gt_statfs_slow = 1;
1591 		gt->gt_statfs_quantum = 30;
1592 	}
1593 	spin_unlock(&gt->gt_spin);
1594 
1595 	gfs2_online_uevent(sdp);
1596 	return error;
1597 }
1598 
1599 static const struct fs_context_operations gfs2_context_ops = {
1600 	.free        = gfs2_fc_free,
1601 	.parse_param = gfs2_parse_param,
1602 	.get_tree    = gfs2_get_tree,
1603 	.reconfigure = gfs2_reconfigure,
1604 };
1605 
1606 /* Set up the filesystem mount context */
gfs2_init_fs_context(struct fs_context * fc)1607 static int gfs2_init_fs_context(struct fs_context *fc)
1608 {
1609 	struct gfs2_args *args;
1610 
1611 	args = kmalloc(sizeof(*args), GFP_KERNEL);
1612 	if (args == NULL)
1613 		return -ENOMEM;
1614 
1615 	if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
1616 		struct gfs2_sbd *sdp = fc->root->d_sb->s_fs_info;
1617 
1618 		*args = sdp->sd_args;
1619 	} else {
1620 		memset(args, 0, sizeof(*args));
1621 		args->ar_quota = GFS2_QUOTA_DEFAULT;
1622 		args->ar_data = GFS2_DATA_DEFAULT;
1623 		args->ar_commit = 30;
1624 		args->ar_statfs_quantum = 30;
1625 		args->ar_quota_quantum = 60;
1626 		args->ar_errors = GFS2_ERRORS_DEFAULT;
1627 	}
1628 	fc->fs_private = args;
1629 	fc->ops = &gfs2_context_ops;
1630 	return 0;
1631 }
1632 
set_meta_super(struct super_block * s,struct fs_context * fc)1633 static int set_meta_super(struct super_block *s, struct fs_context *fc)
1634 {
1635 	return -EINVAL;
1636 }
1637 
test_meta_super(struct super_block * s,struct fs_context * fc)1638 static int test_meta_super(struct super_block *s, struct fs_context *fc)
1639 {
1640 	return (fc->sget_key == s->s_bdev);
1641 }
1642 
gfs2_meta_get_tree(struct fs_context * fc)1643 static int gfs2_meta_get_tree(struct fs_context *fc)
1644 {
1645 	struct super_block *s;
1646 	struct gfs2_sbd *sdp;
1647 	struct path path;
1648 	int error;
1649 
1650 	if (!fc->source || !*fc->source)
1651 		return -EINVAL;
1652 
1653 	error = kern_path(fc->source, LOOKUP_FOLLOW, &path);
1654 	if (error) {
1655 		pr_warn("path_lookup on %s returned error %d\n",
1656 		        fc->source, error);
1657 		return error;
1658 	}
1659 	fc->fs_type = &gfs2_fs_type;
1660 	fc->sget_key = path.dentry->d_sb->s_bdev;
1661 	s = sget_fc(fc, test_meta_super, set_meta_super);
1662 	path_put(&path);
1663 	if (IS_ERR(s)) {
1664 		pr_warn("gfs2 mount does not exist\n");
1665 		return PTR_ERR(s);
1666 	}
1667 	if ((fc->sb_flags ^ s->s_flags) & SB_RDONLY) {
1668 		deactivate_locked_super(s);
1669 		return -EBUSY;
1670 	}
1671 	sdp = s->s_fs_info;
1672 	fc->root = dget(sdp->sd_master_dir);
1673 	return 0;
1674 }
1675 
1676 static const struct fs_context_operations gfs2_meta_context_ops = {
1677 	.free        = gfs2_fc_free,
1678 	.get_tree    = gfs2_meta_get_tree,
1679 };
1680 
gfs2_meta_init_fs_context(struct fs_context * fc)1681 static int gfs2_meta_init_fs_context(struct fs_context *fc)
1682 {
1683 	int ret = gfs2_init_fs_context(fc);
1684 
1685 	if (ret)
1686 		return ret;
1687 
1688 	fc->ops = &gfs2_meta_context_ops;
1689 	return 0;
1690 }
1691 
gfs2_kill_sb(struct super_block * sb)1692 static void gfs2_kill_sb(struct super_block *sb)
1693 {
1694 	struct gfs2_sbd *sdp = sb->s_fs_info;
1695 
1696 	if (sdp == NULL) {
1697 		kill_block_super(sb);
1698 		return;
1699 	}
1700 
1701 	gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SYNC | GFS2_LFC_KILL_SB);
1702 	dput(sdp->sd_root_dir);
1703 	dput(sdp->sd_master_dir);
1704 	sdp->sd_root_dir = NULL;
1705 	sdp->sd_master_dir = NULL;
1706 	shrink_dcache_sb(sb);
1707 	kill_block_super(sb);
1708 }
1709 
1710 struct file_system_type gfs2_fs_type = {
1711 	.name = "gfs2",
1712 	.fs_flags = FS_REQUIRES_DEV,
1713 	.init_fs_context = gfs2_init_fs_context,
1714 	.parameters = gfs2_fs_parameters,
1715 	.kill_sb = gfs2_kill_sb,
1716 	.owner = THIS_MODULE,
1717 };
1718 MODULE_ALIAS_FS("gfs2");
1719 
1720 struct file_system_type gfs2meta_fs_type = {
1721 	.name = "gfs2meta",
1722 	.fs_flags = FS_REQUIRES_DEV,
1723 	.init_fs_context = gfs2_meta_init_fs_context,
1724 	.owner = THIS_MODULE,
1725 };
1726 MODULE_ALIAS_FS("gfs2meta");
1727