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TOMOYO Linux Cross Reference
Linux/fs/gfs2/ops_fstype.c

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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 
 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 
 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 
 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         init_waitqueue_head(&sdp->sd_log_flush_wait);
140         atomic_set(&sdp->sd_freeze_state, SFS_UNFROZEN);
141         mutex_init(&sdp->sd_freeze_mutex);
142 
143         return sdp;
144 
145 fail:
146         free_sbd(sdp);
147         return NULL;
148 }
149 
150 /**
151  * gfs2_check_sb - Check superblock
152  * @sdp: the filesystem
153  * @silent: Don't print a message if the check fails
154  *
155  * Checks the version code of the FS is one that we understand how to
156  * read and that the sizes of the various on-disk structures have not
157  * changed.
158  */
159 
160 static int gfs2_check_sb(struct gfs2_sbd *sdp, int silent)
161 {
162         struct gfs2_sb_host *sb = &sdp->sd_sb;
163 
164         if (sb->sb_magic != GFS2_MAGIC ||
165             sb->sb_type != GFS2_METATYPE_SB) {
166                 if (!silent)
167                         pr_warn("not a GFS2 filesystem\n");
168                 return -EINVAL;
169         }
170 
171         if (sb->sb_fs_format < GFS2_FS_FORMAT_MIN ||
172             sb->sb_fs_format > GFS2_FS_FORMAT_MAX ||
173             sb->sb_multihost_format != GFS2_FORMAT_MULTI) {
174                 fs_warn(sdp, "Unknown on-disk format, unable to mount\n");
175                 return -EINVAL;
176         }
177 
178         if (sb->sb_bsize < 512 || sb->sb_bsize > PAGE_SIZE ||
179             (sb->sb_bsize & (sb->sb_bsize - 1))) {
180                 pr_warn("Invalid block size\n");
181                 return -EINVAL;
182         }
183 
184         return 0;
185 }
186 
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 
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 
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(GFP_NOFS, 1);
255         bio->bi_iter.bi_sector = sector * (sb->s_blocksize >> 9);
256         bio_set_dev(bio, sb->s_bdev);
257         bio_add_page(bio, page, PAGE_SIZE, 0);
258 
259         bio->bi_end_io = end_bio_io_page;
260         bio->bi_private = page;
261         bio_set_op_attrs(bio, REQ_OP_READ, REQ_META);
262         submit_bio(bio);
263         wait_on_page_locked(page);
264         bio_put(bio);
265         if (!PageUptodate(page)) {
266                 __free_page(page);
267                 return -EIO;
268         }
269         p = kmap(page);
270         gfs2_sb_in(sdp, p);
271         kunmap(page);
272         __free_page(page);
273         return gfs2_check_sb(sdp, silent);
274 }
275 
276 /**
277  * gfs2_read_sb - Read super block
278  * @sdp: The GFS2 superblock
279  * @silent: Don't print message if mount fails
280  *
281  */
282 
283 static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent)
284 {
285         u32 hash_blocks, ind_blocks, leaf_blocks;
286         u32 tmp_blocks;
287         unsigned int x;
288         int error;
289 
290         error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
291         if (error) {
292                 if (!silent)
293                         fs_err(sdp, "can't read superblock\n");
294                 return error;
295         }
296 
297         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
298                                GFS2_BASIC_BLOCK_SHIFT;
299         sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift);
300         sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
301                           sizeof(struct gfs2_dinode)) / sizeof(u64);
302         sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
303                           sizeof(struct gfs2_meta_header)) / sizeof(u64);
304         sdp->sd_ldptrs = (sdp->sd_sb.sb_bsize -
305                           sizeof(struct gfs2_log_descriptor)) / sizeof(u64);
306         sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
307         sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
308         sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
309         sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64);
310         sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
311                                 sizeof(struct gfs2_meta_header)) /
312                                 sizeof(struct gfs2_quota_change);
313         sdp->sd_blocks_per_bitmap = (sdp->sd_sb.sb_bsize -
314                                      sizeof(struct gfs2_meta_header))
315                 * GFS2_NBBY; /* not the rgrp bitmap, subsequent bitmaps only */
316 
317         /*
318          * We always keep at least one block reserved for revokes in
319          * transactions.  This greatly simplifies allocating additional
320          * revoke blocks.
321          */
322         atomic_set(&sdp->sd_log_revokes_available, sdp->sd_ldptrs);
323 
324         /* Compute maximum reservation required to add a entry to a directory */
325 
326         hash_blocks = DIV_ROUND_UP(sizeof(u64) * BIT(GFS2_DIR_MAX_DEPTH),
327                              sdp->sd_jbsize);
328 
329         ind_blocks = 0;
330         for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
331                 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
332                 ind_blocks += tmp_blocks;
333         }
334 
335         leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
336 
337         sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
338 
339         sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
340                                 sizeof(struct gfs2_dinode);
341         sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
342         for (x = 2;; x++) {
343                 u64 space, d;
344                 u32 m;
345 
346                 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
347                 d = space;
348                 m = do_div(d, sdp->sd_inptrs);
349 
350                 if (d != sdp->sd_heightsize[x - 1] || m)
351                         break;
352                 sdp->sd_heightsize[x] = space;
353         }
354         sdp->sd_max_height = x;
355         sdp->sd_heightsize[x] = ~0;
356         gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
357 
358         sdp->sd_max_dents_per_leaf = (sdp->sd_sb.sb_bsize -
359                                       sizeof(struct gfs2_leaf)) /
360                                      GFS2_MIN_DIRENT_SIZE;
361         return 0;
362 }
363 
364 static int init_names(struct gfs2_sbd *sdp, int silent)
365 {
366         char *proto, *table;
367         int error = 0;
368 
369         proto = sdp->sd_args.ar_lockproto;
370         table = sdp->sd_args.ar_locktable;
371 
372         /*  Try to autodetect  */
373 
374         if (!proto[0] || !table[0]) {
375                 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
376                 if (error)
377                         return error;
378 
379                 if (!proto[0])
380                         proto = sdp->sd_sb.sb_lockproto;
381                 if (!table[0])
382                         table = sdp->sd_sb.sb_locktable;
383         }
384 
385         if (!table[0])
386                 table = sdp->sd_vfs->s_id;
387 
388         strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN);
389         strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN);
390 
391         table = sdp->sd_table_name;
392         while ((table = strchr(table, '/')))
393                 *table = '_';
394 
395         return error;
396 }
397 
398 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
399                         int undo)
400 {
401         int error = 0;
402 
403         if (undo)
404                 goto fail_trans;
405 
406         error = gfs2_glock_nq_num(sdp,
407                                   GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
408                                   LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
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,
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 transaction 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 
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 
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 
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 
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                 spin_lock(&sdp->sd_jindex_spin);
618                 jd->jd_jid = sdp->sd_journals++;
619                 jip = GFS2_I(jd->jd_inode);
620                 jd->jd_no_addr = jip->i_no_addr;
621                 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
622                 spin_unlock(&sdp->sd_jindex_spin);
623         }
624 
625         mutex_unlock(&sdp->sd_jindex_mutex);
626 
627         return error;
628 }
629 
630 /**
631  * init_statfs - look up and initialize master and local (per node) statfs inodes
632  * @sdp: The GFS2 superblock
633  *
634  * This should be called after the jindex is initialized in init_journal() and
635  * before gfs2_journal_recovery() is called because we need to be able to write
636  * to these inodes during recovery.
637  *
638  * Returns: errno
639  */
640 static int init_statfs(struct gfs2_sbd *sdp)
641 {
642         int error = 0;
643         struct inode *master = d_inode(sdp->sd_master_dir);
644         struct inode *pn = NULL;
645         char buf[30];
646         struct gfs2_jdesc *jd;
647         struct gfs2_inode *ip;
648 
649         sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs");
650         if (IS_ERR(sdp->sd_statfs_inode)) {
651                 error = PTR_ERR(sdp->sd_statfs_inode);
652                 fs_err(sdp, "can't read in statfs inode: %d\n", error);
653                 goto out;
654         }
655         if (sdp->sd_args.ar_spectator)
656                 goto out;
657 
658         pn = gfs2_lookup_simple(master, "per_node");
659         if (IS_ERR(pn)) {
660                 error = PTR_ERR(pn);
661                 fs_err(sdp, "can't find per_node directory: %d\n", error);
662                 goto put_statfs;
663         }
664 
665         /* For each jid, lookup the corresponding local statfs inode in the
666          * per_node metafs directory and save it in the sdp->sd_sc_inodes_list. */
667         list_for_each_entry(jd, &sdp->sd_jindex_list, jd_list) {
668                 struct local_statfs_inode *lsi =
669                         kmalloc(sizeof(struct local_statfs_inode), GFP_NOFS);
670                 if (!lsi) {
671                         error = -ENOMEM;
672                         goto free_local;
673                 }
674                 sprintf(buf, "statfs_change%u", jd->jd_jid);
675                 lsi->si_sc_inode = gfs2_lookup_simple(pn, buf);
676                 if (IS_ERR(lsi->si_sc_inode)) {
677                         error = PTR_ERR(lsi->si_sc_inode);
678                         fs_err(sdp, "can't find local \"sc\" file#%u: %d\n",
679                                jd->jd_jid, error);
680                         kfree(lsi);
681                         goto free_local;
682                 }
683                 lsi->si_jid = jd->jd_jid;
684                 if (jd->jd_jid == sdp->sd_jdesc->jd_jid)
685                         sdp->sd_sc_inode = lsi->si_sc_inode;
686 
687                 list_add_tail(&lsi->si_list, &sdp->sd_sc_inodes_list);
688         }
689 
690         iput(pn);
691         pn = NULL;
692         ip = GFS2_I(sdp->sd_sc_inode);
693         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
694                                    &sdp->sd_sc_gh);
695         if (error) {
696                 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
697                 goto free_local;
698         }
699         return 0;
700 
701 free_local:
702         free_local_statfs_inodes(sdp);
703         iput(pn);
704 put_statfs:
705         iput(sdp->sd_statfs_inode);
706 out:
707         return error;
708 }
709 
710 /* Uninitialize and free up memory used by the list of statfs inodes */
711 static void uninit_statfs(struct gfs2_sbd *sdp)
712 {
713         if (!sdp->sd_args.ar_spectator) {
714                 gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
715                 free_local_statfs_inodes(sdp);
716         }
717         iput(sdp->sd_statfs_inode);
718 }
719 
720 static int init_journal(struct gfs2_sbd *sdp, int undo)
721 {
722         struct inode *master = d_inode(sdp->sd_master_dir);
723         struct gfs2_holder ji_gh;
724         struct gfs2_inode *ip;
725         int jindex = 1;
726         int error = 0;
727 
728         if (undo) {
729                 jindex = 0;
730                 goto fail_statfs;
731         }
732 
733         sdp->sd_jindex = gfs2_lookup_simple(master, "jindex");
734         if (IS_ERR(sdp->sd_jindex)) {
735                 fs_err(sdp, "can't lookup journal index: %d\n", error);
736                 return PTR_ERR(sdp->sd_jindex);
737         }
738 
739         /* Load in the journal index special file */
740 
741         error = gfs2_jindex_hold(sdp, &ji_gh);
742         if (error) {
743                 fs_err(sdp, "can't read journal index: %d\n", error);
744                 goto fail;
745         }
746 
747         error = -EUSERS;
748         if (!gfs2_jindex_size(sdp)) {
749                 fs_err(sdp, "no journals!\n");
750                 goto fail_jindex;
751         }
752 
753         atomic_set(&sdp->sd_log_blks_needed, 0);
754         if (sdp->sd_args.ar_spectator) {
755                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
756                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
757                 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
758                 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
759         } else {
760                 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
761                         fs_err(sdp, "can't mount journal #%u\n",
762                                sdp->sd_lockstruct.ls_jid);
763                         fs_err(sdp, "there are only %u journals (0 - %u)\n",
764                                gfs2_jindex_size(sdp),
765                                gfs2_jindex_size(sdp) - 1);
766                         goto fail_jindex;
767                 }
768                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
769 
770                 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
771                                           &gfs2_journal_glops,
772                                           LM_ST_EXCLUSIVE,
773                                           LM_FLAG_NOEXP | GL_NOCACHE,
774                                           &sdp->sd_journal_gh);
775                 if (error) {
776                         fs_err(sdp, "can't acquire journal glock: %d\n", error);
777                         goto fail_jindex;
778                 }
779 
780                 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
781                 sdp->sd_jinode_gl = ip->i_gl;
782                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
783                                            LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE,
784                                            &sdp->sd_jinode_gh);
785                 if (error) {
786                         fs_err(sdp, "can't acquire journal inode glock: %d\n",
787                                error);
788                         goto fail_journal_gh;
789                 }
790 
791                 error = gfs2_jdesc_check(sdp->sd_jdesc);
792                 if (error) {
793                         fs_err(sdp, "my journal (%u) is bad: %d\n",
794                                sdp->sd_jdesc->jd_jid, error);
795                         goto fail_jinode_gh;
796                 }
797                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
798                 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
799                 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
800 
801                 /* Map the extents for this journal's blocks */
802                 gfs2_map_journal_extents(sdp, sdp->sd_jdesc);
803         }
804         trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free));
805 
806         /* Lookup statfs inodes here so journal recovery can use them. */
807         error = init_statfs(sdp);
808         if (error)
809                 goto fail_jinode_gh;
810 
811         if (sdp->sd_lockstruct.ls_first) {
812                 unsigned int x;
813                 for (x = 0; x < sdp->sd_journals; x++) {
814                         struct gfs2_jdesc *jd = gfs2_jdesc_find(sdp, x);
815 
816                         if (sdp->sd_args.ar_spectator) {
817                                 error = check_journal_clean(sdp, jd, true);
818                                 if (error)
819                                         goto fail_statfs;
820                                 continue;
821                         }
822                         error = gfs2_recover_journal(jd, true);
823                         if (error) {
824                                 fs_err(sdp, "error recovering journal %u: %d\n",
825                                        x, error);
826                                 goto fail_statfs;
827                         }
828                 }
829 
830                 gfs2_others_may_mount(sdp);
831         } else if (!sdp->sd_args.ar_spectator) {
832                 error = gfs2_recover_journal(sdp->sd_jdesc, true);
833                 if (error) {
834                         fs_err(sdp, "error recovering my journal: %d\n", error);
835                         goto fail_statfs;
836                 }
837         }
838 
839         sdp->sd_log_idle = 1;
840         set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
841         gfs2_glock_dq_uninit(&ji_gh);
842         jindex = 0;
843         INIT_WORK(&sdp->sd_freeze_work, gfs2_freeze_func);
844         return 0;
845 
846 fail_statfs:
847         uninit_statfs(sdp);
848 fail_jinode_gh:
849         /* A withdraw may have done dq/uninit so now we need to check it */
850         if (!sdp->sd_args.ar_spectator &&
851             gfs2_holder_initialized(&sdp->sd_jinode_gh))
852                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
853 fail_journal_gh:
854         if (!sdp->sd_args.ar_spectator &&
855             gfs2_holder_initialized(&sdp->sd_journal_gh))
856                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
857 fail_jindex:
858         gfs2_jindex_free(sdp);
859         if (jindex)
860                 gfs2_glock_dq_uninit(&ji_gh);
861 fail:
862         iput(sdp->sd_jindex);
863         return error;
864 }
865 
866 static struct lock_class_key gfs2_quota_imutex_key;
867 
868 static int init_inodes(struct gfs2_sbd *sdp, int undo)
869 {
870         int error = 0;
871         struct inode *master = d_inode(sdp->sd_master_dir);
872 
873         if (undo)
874                 goto fail_qinode;
875 
876         error = init_journal(sdp, undo);
877         complete_all(&sdp->sd_journal_ready);
878         if (error)
879                 goto fail;
880 
881         /* Read in the resource index inode */
882         sdp->sd_rindex = gfs2_lookup_simple(master, "rindex");
883         if (IS_ERR(sdp->sd_rindex)) {
884                 error = PTR_ERR(sdp->sd_rindex);
885                 fs_err(sdp, "can't get resource index inode: %d\n", error);
886                 goto fail_journal;
887         }
888         sdp->sd_rindex_uptodate = 0;
889 
890         /* Read in the quota inode */
891         sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota");
892         if (IS_ERR(sdp->sd_quota_inode)) {
893                 error = PTR_ERR(sdp->sd_quota_inode);
894                 fs_err(sdp, "can't get quota file inode: %d\n", error);
895                 goto fail_rindex;
896         }
897         /*
898          * i_rwsem on quota files is special. Since this inode is hidden system
899          * file, we are safe to define locking ourselves.
900          */
901         lockdep_set_class(&sdp->sd_quota_inode->i_rwsem,
902                           &gfs2_quota_imutex_key);
903 
904         error = gfs2_rindex_update(sdp);
905         if (error)
906                 goto fail_qinode;
907 
908         return 0;
909 
910 fail_qinode:
911         iput(sdp->sd_quota_inode);
912 fail_rindex:
913         gfs2_clear_rgrpd(sdp);
914         iput(sdp->sd_rindex);
915 fail_journal:
916         init_journal(sdp, UNDO);
917 fail:
918         return error;
919 }
920 
921 static int init_per_node(struct gfs2_sbd *sdp, int undo)
922 {
923         struct inode *pn = NULL;
924         char buf[30];
925         int error = 0;
926         struct gfs2_inode *ip;
927         struct inode *master = d_inode(sdp->sd_master_dir);
928 
929         if (sdp->sd_args.ar_spectator)
930                 return 0;
931 
932         if (undo)
933                 goto fail_qc_gh;
934 
935         pn = gfs2_lookup_simple(master, "per_node");
936         if (IS_ERR(pn)) {
937                 error = PTR_ERR(pn);
938                 fs_err(sdp, "can't find per_node directory: %d\n", error);
939                 return error;
940         }
941 
942         sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
943         sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
944         if (IS_ERR(sdp->sd_qc_inode)) {
945                 error = PTR_ERR(sdp->sd_qc_inode);
946                 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
947                 goto fail_ut_i;
948         }
949 
950         iput(pn);
951         pn = NULL;
952 
953         ip = GFS2_I(sdp->sd_qc_inode);
954         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
955                                    &sdp->sd_qc_gh);
956         if (error) {
957                 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
958                 goto fail_qc_i;
959         }
960 
961         return 0;
962 
963 fail_qc_gh:
964         gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
965 fail_qc_i:
966         iput(sdp->sd_qc_inode);
967 fail_ut_i:
968         iput(pn);
969         return error;
970 }
971 
972 static const match_table_t nolock_tokens = {
973         { Opt_jid, "jid=%d", },
974         { Opt_err, NULL },
975 };
976 
977 static const struct lm_lockops nolock_ops = {
978         .lm_proto_name = "lock_nolock",
979         .lm_put_lock = gfs2_glock_free,
980         .lm_tokens = &nolock_tokens,
981 };
982 
983 /**
984  * gfs2_lm_mount - mount a locking protocol
985  * @sdp: the filesystem
986  * @silent: if 1, don't complain if the FS isn't a GFS2 fs
987  *
988  * Returns: errno
989  */
990 
991 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
992 {
993         const struct lm_lockops *lm;
994         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
995         struct gfs2_args *args = &sdp->sd_args;
996         const char *proto = sdp->sd_proto_name;
997         const char *table = sdp->sd_table_name;
998         char *o, *options;
999         int ret;
1000 
1001         if (!strcmp("lock_nolock", proto)) {
1002                 lm = &nolock_ops;
1003                 sdp->sd_args.ar_localflocks = 1;
1004 #ifdef CONFIG_GFS2_FS_LOCKING_DLM
1005         } else if (!strcmp("lock_dlm", proto)) {
1006                 lm = &gfs2_dlm_ops;
1007 #endif
1008         } else {
1009                 pr_info("can't find protocol %s\n", proto);
1010                 return -ENOENT;
1011         }
1012 
1013         fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
1014 
1015         ls->ls_ops = lm;
1016         ls->ls_first = 1;
1017 
1018         for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) {
1019                 substring_t tmp[MAX_OPT_ARGS];
1020                 int token, option;
1021 
1022                 if (!o || !*o)
1023                         continue;
1024 
1025                 token = match_token(o, *lm->lm_tokens, tmp);
1026                 switch (token) {
1027                 case Opt_jid:
1028                         ret = match_int(&tmp[0], &option);
1029                         if (ret || option < 0) 
1030                                 goto hostdata_error;
1031                         if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags))
1032                                 ls->ls_jid = option;
1033                         break;
1034                 case Opt_id:
1035                 case Opt_nodir:
1036                         /* Obsolete, but left for backward compat purposes */
1037                         break;
1038                 case Opt_first:
1039                         ret = match_int(&tmp[0], &option);
1040                         if (ret || (option != 0 && option != 1))
1041                                 goto hostdata_error;
1042                         ls->ls_first = option;
1043                         break;
1044                 case Opt_err:
1045                 default:
1046 hostdata_error:
1047                         fs_info(sdp, "unknown hostdata (%s)\n", o);
1048                         return -EINVAL;
1049                 }
1050         }
1051 
1052         if (lm->lm_mount == NULL) {
1053                 fs_info(sdp, "Now mounting FS (format %u)...\n", sdp->sd_sb.sb_fs_format);
1054                 complete_all(&sdp->sd_locking_init);
1055                 return 0;
1056         }
1057         ret = lm->lm_mount(sdp, table);
1058         if (ret == 0)
1059                 fs_info(sdp, "Joined cluster. Now mounting FS (format %u)...\n",
1060                         sdp->sd_sb.sb_fs_format);
1061         complete_all(&sdp->sd_locking_init);
1062         return ret;
1063 }
1064 
1065 void gfs2_lm_unmount(struct gfs2_sbd *sdp)
1066 {
1067         const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops;
1068         if (likely(!gfs2_withdrawn(sdp)) && lm->lm_unmount)
1069                 lm->lm_unmount(sdp);
1070 }
1071 
1072 static int wait_on_journal(struct gfs2_sbd *sdp)
1073 {
1074         if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
1075                 return 0;
1076 
1077         return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, TASK_INTERRUPTIBLE)
1078                 ? -EINTR : 0;
1079 }
1080 
1081 void gfs2_online_uevent(struct gfs2_sbd *sdp)
1082 {
1083         struct super_block *sb = sdp->sd_vfs;
1084         char ro[20];
1085         char spectator[20];
1086         char *envp[] = { ro, spectator, NULL };
1087         sprintf(ro, "RDONLY=%d", sb_rdonly(sb));
1088         sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
1089         kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp);
1090 }
1091 
1092 static int init_threads(struct gfs2_sbd *sdp)
1093 {
1094         struct task_struct *p;
1095         int error = 0;
1096 
1097         p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
1098         if (IS_ERR(p)) {
1099                 error = PTR_ERR(p);
1100                 fs_err(sdp, "can't start logd thread: %d\n", error);
1101                 return error;
1102         }
1103         sdp->sd_logd_process = p;
1104 
1105         p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
1106         if (IS_ERR(p)) {
1107                 error = PTR_ERR(p);
1108                 fs_err(sdp, "can't start quotad thread: %d\n", error);
1109                 goto fail;
1110         }
1111         sdp->sd_quotad_process = p;
1112         return 0;
1113 
1114 fail:
1115         kthread_stop(sdp->sd_logd_process);
1116         sdp->sd_logd_process = NULL;
1117         return error;
1118 }
1119 
1120 /**
1121  * gfs2_fill_super - Read in superblock
1122  * @sb: The VFS superblock
1123  * @fc: Mount options and flags
1124  *
1125  * Returns: -errno
1126  */
1127 static int gfs2_fill_super(struct super_block *sb, struct fs_context *fc)
1128 {
1129         struct gfs2_args *args = fc->fs_private;
1130         int silent = fc->sb_flags & SB_SILENT;
1131         struct gfs2_sbd *sdp;
1132         struct gfs2_holder mount_gh;
1133         struct gfs2_holder freeze_gh;
1134         int error;
1135 
1136         sdp = init_sbd(sb);
1137         if (!sdp) {
1138                 pr_warn("can't alloc struct gfs2_sbd\n");
1139                 return -ENOMEM;
1140         }
1141         sdp->sd_args = *args;
1142 
1143         if (sdp->sd_args.ar_spectator) {
1144                 sb->s_flags |= SB_RDONLY;
1145                 set_bit(SDF_RORECOVERY, &sdp->sd_flags);
1146         }
1147         if (sdp->sd_args.ar_posix_acl)
1148                 sb->s_flags |= SB_POSIXACL;
1149         if (sdp->sd_args.ar_nobarrier)
1150                 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1151 
1152         sb->s_flags |= SB_NOSEC;
1153         sb->s_magic = GFS2_MAGIC;
1154         sb->s_op = &gfs2_super_ops;
1155         sb->s_d_op = &gfs2_dops;
1156         sb->s_export_op = &gfs2_export_ops;
1157         sb->s_qcop = &gfs2_quotactl_ops;
1158         sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP;
1159         sb_dqopt(sb)->flags |= DQUOT_QUOTA_SYS_FILE;
1160         sb->s_time_gran = 1;
1161         sb->s_maxbytes = MAX_LFS_FILESIZE;
1162 
1163         /* Set up the buffer cache and fill in some fake block size values
1164            to allow us to read-in the on-disk superblock. */
1165         sdp->sd_sb.sb_bsize = sb_min_blocksize(sb, GFS2_BASIC_BLOCK);
1166         sdp->sd_sb.sb_bsize_shift = sb->s_blocksize_bits;
1167         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
1168                                GFS2_BASIC_BLOCK_SHIFT;
1169         sdp->sd_fsb2bb = BIT(sdp->sd_fsb2bb_shift);
1170 
1171         sdp->sd_tune.gt_logd_secs = sdp->sd_args.ar_commit;
1172         sdp->sd_tune.gt_quota_quantum = sdp->sd_args.ar_quota_quantum;
1173         if (sdp->sd_args.ar_statfs_quantum) {
1174                 sdp->sd_tune.gt_statfs_slow = 0;
1175                 sdp->sd_tune.gt_statfs_quantum = sdp->sd_args.ar_statfs_quantum;
1176         } else {
1177                 sdp->sd_tune.gt_statfs_slow = 1;
1178                 sdp->sd_tune.gt_statfs_quantum = 30;
1179         }
1180 
1181         error = init_names(sdp, silent);
1182         if (error)
1183                 goto fail_free;
1184 
1185         snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s", sdp->sd_table_name);
1186 
1187         error = gfs2_sys_fs_add(sdp);
1188         if (error)
1189                 goto fail_free;
1190 
1191         gfs2_create_debugfs_file(sdp);
1192 
1193         error = gfs2_lm_mount(sdp, silent);
1194         if (error)
1195                 goto fail_debug;
1196 
1197         error = init_locking(sdp, &mount_gh, DO);
1198         if (error)
1199                 goto fail_lm;
1200 
1201         error = init_sb(sdp, silent);
1202         if (error)
1203                 goto fail_locking;
1204 
1205         /* Turn rgrplvb on by default if fs format is recent enough */
1206         if (!sdp->sd_args.ar_got_rgrplvb && sdp->sd_sb.sb_fs_format > 1801)
1207                 sdp->sd_args.ar_rgrplvb = 1;
1208 
1209         error = wait_on_journal(sdp);
1210         if (error)
1211                 goto fail_sb;
1212 
1213         /*
1214          * If user space has failed to join the cluster or some similar
1215          * failure has occurred, then the journal id will contain a
1216          * negative (error) number. This will then be returned to the
1217          * caller (of the mount syscall). We do this even for spectator
1218          * mounts (which just write a jid of 0 to indicate "ok" even though
1219          * the jid is unused in the spectator case)
1220          */
1221         if (sdp->sd_lockstruct.ls_jid < 0) {
1222                 error = sdp->sd_lockstruct.ls_jid;
1223                 sdp->sd_lockstruct.ls_jid = 0;
1224                 goto fail_sb;
1225         }
1226 
1227         if (sdp->sd_args.ar_spectator)
1228                 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.s",
1229                          sdp->sd_table_name);
1230         else
1231                 snprintf(sdp->sd_fsname, sizeof(sdp->sd_fsname), "%s.%u",
1232                          sdp->sd_table_name, sdp->sd_lockstruct.ls_jid);
1233 
1234         error = init_inodes(sdp, DO);
1235         if (error)
1236                 goto fail_sb;
1237 
1238         error = init_per_node(sdp, DO);
1239         if (error)
1240                 goto fail_inodes;
1241 
1242         error = gfs2_statfs_init(sdp);
1243         if (error) {
1244                 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
1245                 goto fail_per_node;
1246         }
1247 
1248         if (!sb_rdonly(sb)) {
1249                 error = init_threads(sdp);
1250                 if (error) {
1251                         gfs2_withdraw_delayed(sdp);
1252                         goto fail_per_node;
1253                 }
1254         }
1255 
1256         error = gfs2_freeze_lock(sdp, &freeze_gh, 0);
1257         if (error)
1258                 goto fail_per_node;
1259 
1260         if (!sb_rdonly(sb))
1261                 error = gfs2_make_fs_rw(sdp);
1262 
1263         gfs2_freeze_unlock(&freeze_gh);
1264         if (error) {
1265                 if (sdp->sd_quotad_process)
1266                         kthread_stop(sdp->sd_quotad_process);
1267                 sdp->sd_quotad_process = NULL;
1268                 if (sdp->sd_logd_process)
1269                         kthread_stop(sdp->sd_logd_process);
1270                 sdp->sd_logd_process = NULL;
1271                 fs_err(sdp, "can't make FS RW: %d\n", error);
1272                 goto fail_per_node;
1273         }
1274         gfs2_glock_dq_uninit(&mount_gh);
1275         gfs2_online_uevent(sdp);
1276         return 0;
1277 
1278 fail_per_node:
1279         init_per_node(sdp, UNDO);
1280 fail_inodes:
1281         init_inodes(sdp, UNDO);
1282 fail_sb:
1283         if (sdp->sd_root_dir)
1284                 dput(sdp->sd_root_dir);
1285         if (sdp->sd_master_dir)
1286                 dput(sdp->sd_master_dir);
1287         if (sb->s_root)
1288                 dput(sb->s_root);
1289         sb->s_root = NULL;
1290 fail_locking:
1291         init_locking(sdp, &mount_gh, UNDO);
1292 fail_lm:
1293         complete_all(&sdp->sd_journal_ready);
1294         gfs2_gl_hash_clear(sdp);
1295         gfs2_lm_unmount(sdp);
1296 fail_debug:
1297         gfs2_delete_debugfs_file(sdp);
1298         gfs2_sys_fs_del(sdp);
1299 fail_free:
1300         free_sbd(sdp);
1301         sb->s_fs_info = NULL;
1302         return error;
1303 }
1304 
1305 /**
1306  * gfs2_get_tree - Get the GFS2 superblock and root directory
1307  * @fc: The filesystem context
1308  *
1309  * Returns: 0 or -errno on error
1310  */
1311 static int gfs2_get_tree(struct fs_context *fc)
1312 {
1313         struct gfs2_args *args = fc->fs_private;
1314         struct gfs2_sbd *sdp;
1315         int error;
1316 
1317         error = get_tree_bdev(fc, gfs2_fill_super);
1318         if (error)
1319                 return error;
1320 
1321         sdp = fc->root->d_sb->s_fs_info;
1322         dput(fc->root);
1323         if (args->ar_meta)
1324                 fc->root = dget(sdp->sd_master_dir);
1325         else
1326                 fc->root = dget(sdp->sd_root_dir);
1327         return 0;
1328 }
1329 
1330 static void gfs2_fc_free(struct fs_context *fc)
1331 {
1332         struct gfs2_args *args = fc->fs_private;
1333 
1334         kfree(args);
1335 }
1336 
1337 enum gfs2_param {
1338         Opt_lockproto,
1339         Opt_locktable,
1340         Opt_hostdata,
1341         Opt_spectator,
1342         Opt_ignore_local_fs,
1343         Opt_localflocks,
1344         Opt_localcaching,
1345         Opt_debug,
1346         Opt_upgrade,
1347         Opt_acl,
1348         Opt_quota,
1349         Opt_quota_flag,
1350         Opt_suiddir,
1351         Opt_data,
1352         Opt_meta,
1353         Opt_discard,
1354         Opt_commit,
1355         Opt_errors,
1356         Opt_statfs_quantum,
1357         Opt_statfs_percent,
1358         Opt_quota_quantum,
1359         Opt_barrier,
1360         Opt_rgrplvb,
1361         Opt_loccookie,
1362 };
1363 
1364 static const struct constant_table gfs2_param_quota[] = {
1365         {"off",        GFS2_QUOTA_OFF},
1366         {"account",    GFS2_QUOTA_ACCOUNT},
1367         {"on",         GFS2_QUOTA_ON},
1368         {}
1369 };
1370 
1371 enum opt_data {
1372         Opt_data_writeback = GFS2_DATA_WRITEBACK,
1373         Opt_data_ordered   = GFS2_DATA_ORDERED,
1374 };
1375 
1376 static const struct constant_table gfs2_param_data[] = {
1377         {"writeback",  Opt_data_writeback },
1378         {"ordered",    Opt_data_ordered },
1379         {}
1380 };
1381 
1382 enum opt_errors {
1383         Opt_errors_withdraw = GFS2_ERRORS_WITHDRAW,
1384         Opt_errors_panic    = GFS2_ERRORS_PANIC,
1385 };
1386 
1387 static const struct constant_table gfs2_param_errors[] = {
1388         {"withdraw",   Opt_errors_withdraw },
1389         {"panic",      Opt_errors_panic },
1390         {}
1391 };
1392 
1393 static const struct fs_parameter_spec gfs2_fs_parameters[] = {
1394         fsparam_string ("lockproto",          Opt_lockproto),
1395         fsparam_string ("locktable",          Opt_locktable),
1396         fsparam_string ("hostdata",           Opt_hostdata),
1397         fsparam_flag   ("spectator",          Opt_spectator),
1398         fsparam_flag   ("norecovery",         Opt_spectator),
1399         fsparam_flag   ("ignore_local_fs",    Opt_ignore_local_fs),
1400         fsparam_flag   ("localflocks",        Opt_localflocks),
1401         fsparam_flag   ("localcaching",       Opt_localcaching),
1402         fsparam_flag_no("debug",              Opt_debug),
1403         fsparam_flag   ("upgrade",            Opt_upgrade),
1404         fsparam_flag_no("acl",                Opt_acl),
1405         fsparam_flag_no("suiddir",            Opt_suiddir),
1406         fsparam_enum   ("data",               Opt_data, gfs2_param_data),
1407         fsparam_flag   ("meta",               Opt_meta),
1408         fsparam_flag_no("discard",            Opt_discard),
1409         fsparam_s32    ("commit",             Opt_commit),
1410         fsparam_enum   ("errors",             Opt_errors, gfs2_param_errors),
1411         fsparam_s32    ("statfs_quantum",     Opt_statfs_quantum),
1412         fsparam_s32    ("statfs_percent",     Opt_statfs_percent),
1413         fsparam_s32    ("quota_quantum",      Opt_quota_quantum),
1414         fsparam_flag_no("barrier",            Opt_barrier),
1415         fsparam_flag_no("rgrplvb",            Opt_rgrplvb),
1416         fsparam_flag_no("loccookie",          Opt_loccookie),
1417         /* quota can be a flag or an enum so it gets special treatment */
1418         fsparam_flag_no("quota",              Opt_quota_flag),
1419         fsparam_enum("quota",                 Opt_quota, gfs2_param_quota),
1420         {}
1421 };
1422 
1423 /* Parse a single mount parameter */
1424 static int gfs2_parse_param(struct fs_context *fc, struct fs_parameter *param)
1425 {
1426         struct gfs2_args *args = fc->fs_private;
1427         struct fs_parse_result result;
1428         int o;
1429 
1430         o = fs_parse(fc, gfs2_fs_parameters, param, &result);
1431         if (o < 0)
1432                 return o;
1433 
1434         switch (o) {
1435         case Opt_lockproto:
1436                 strlcpy(args->ar_lockproto, param->string, GFS2_LOCKNAME_LEN);
1437                 break;
1438         case Opt_locktable:
1439                 strlcpy(args->ar_locktable, param->string, GFS2_LOCKNAME_LEN);
1440                 break;
1441         case Opt_hostdata:
1442                 strlcpy(args->ar_hostdata, param->string, GFS2_LOCKNAME_LEN);
1443                 break;
1444         case Opt_spectator:
1445                 args->ar_spectator = 1;
1446                 break;
1447         case Opt_ignore_local_fs:
1448                 /* Retained for backwards compat only */
1449                 break;
1450         case Opt_localflocks:
1451                 args->ar_localflocks = 1;
1452                 break;
1453         case Opt_localcaching:
1454                 /* Retained for backwards compat only */
1455                 break;
1456         case Opt_debug:
1457                 if (result.boolean && args->ar_errors == GFS2_ERRORS_PANIC)
1458                         return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive");
1459                 args->ar_debug = result.boolean;
1460                 break;
1461         case Opt_upgrade:
1462                 /* Retained for backwards compat only */
1463                 break;
1464         case Opt_acl:
1465                 args->ar_posix_acl = result.boolean;
1466                 break;
1467         case Opt_quota_flag:
1468                 args->ar_quota = result.negated ? GFS2_QUOTA_OFF : GFS2_QUOTA_ON;
1469                 break;
1470         case Opt_quota:
1471                 args->ar_quota = result.int_32;
1472                 break;
1473         case Opt_suiddir:
1474                 args->ar_suiddir = result.boolean;
1475                 break;
1476         case Opt_data:
1477                 /* The uint_32 result maps directly to GFS2_DATA_* */
1478                 args->ar_data = result.uint_32;
1479                 break;
1480         case Opt_meta:
1481                 args->ar_meta = 1;
1482                 break;
1483         case Opt_discard:
1484                 args->ar_discard = result.boolean;
1485                 break;
1486         case Opt_commit:
1487                 if (result.int_32 <= 0)
1488                         return invalfc(fc, "commit mount option requires a positive numeric argument");
1489                 args->ar_commit = result.int_32;
1490                 break;
1491         case Opt_statfs_quantum:
1492                 if (result.int_32 < 0)
1493                         return invalfc(fc, "statfs_quantum mount option requires a non-negative numeric argument");
1494                 args->ar_statfs_quantum = result.int_32;
1495                 break;
1496         case Opt_quota_quantum:
1497                 if (result.int_32 <= 0)
1498                         return invalfc(fc, "quota_quantum mount option requires a positive numeric argument");
1499                 args->ar_quota_quantum = result.int_32;
1500                 break;
1501         case Opt_statfs_percent:
1502                 if (result.int_32 < 0 || result.int_32 > 100)
1503                         return invalfc(fc, "statfs_percent mount option requires a numeric argument between 0 and 100");
1504                 args->ar_statfs_percent = result.int_32;
1505                 break;
1506         case Opt_errors:
1507                 if (args->ar_debug && result.uint_32 == GFS2_ERRORS_PANIC)
1508                         return invalfc(fc, "-o debug and -o errors=panic are mutually exclusive");
1509                 args->ar_errors = result.uint_32;
1510                 break;
1511         case Opt_barrier:
1512                 args->ar_nobarrier = result.boolean;
1513                 break;
1514         case Opt_rgrplvb:
1515                 args->ar_rgrplvb = result.boolean;
1516                 args->ar_got_rgrplvb = 1;
1517                 break;
1518         case Opt_loccookie:
1519                 args->ar_loccookie = result.boolean;
1520                 break;
1521         default:
1522                 return invalfc(fc, "invalid mount option: %s", param->key);
1523         }
1524         return 0;
1525 }
1526 
1527 static int gfs2_reconfigure(struct fs_context *fc)
1528 {
1529         struct super_block *sb = fc->root->d_sb;
1530         struct gfs2_sbd *sdp = sb->s_fs_info;
1531         struct gfs2_args *oldargs = &sdp->sd_args;
1532         struct gfs2_args *newargs = fc->fs_private;
1533         struct gfs2_tune *gt = &sdp->sd_tune;
1534         int error = 0;
1535 
1536         sync_filesystem(sb);
1537 
1538         spin_lock(&gt->gt_spin);
1539         oldargs->ar_commit = gt->gt_logd_secs;
1540         oldargs->ar_quota_quantum = gt->gt_quota_quantum;
1541         if (gt->gt_statfs_slow)
1542                 oldargs->ar_statfs_quantum = 0;
1543         else
1544                 oldargs->ar_statfs_quantum = gt->gt_statfs_quantum;
1545         spin_unlock(&gt->gt_spin);
1546 
1547         if (strcmp(newargs->ar_lockproto, oldargs->ar_lockproto)) {
1548                 errorfc(fc, "reconfiguration of locking protocol not allowed");
1549                 return -EINVAL;
1550         }
1551         if (strcmp(newargs->ar_locktable, oldargs->ar_locktable)) {
1552                 errorfc(fc, "reconfiguration of lock table not allowed");
1553                 return -EINVAL;
1554         }
1555         if (strcmp(newargs->ar_hostdata, oldargs->ar_hostdata)) {
1556                 errorfc(fc, "reconfiguration of host data not allowed");
1557                 return -EINVAL;
1558         }
1559         if (newargs->ar_spectator != oldargs->ar_spectator) {
1560                 errorfc(fc, "reconfiguration of spectator mode not allowed");
1561                 return -EINVAL;
1562         }
1563         if (newargs->ar_localflocks != oldargs->ar_localflocks) {
1564                 errorfc(fc, "reconfiguration of localflocks not allowed");
1565                 return -EINVAL;
1566         }
1567         if (newargs->ar_meta != oldargs->ar_meta) {
1568                 errorfc(fc, "switching between gfs2 and gfs2meta not allowed");
1569                 return -EINVAL;
1570         }
1571         if (oldargs->ar_spectator)
1572                 fc->sb_flags |= SB_RDONLY;
1573 
1574         if ((sb->s_flags ^ fc->sb_flags) & SB_RDONLY) {
1575                 struct gfs2_holder freeze_gh;
1576 
1577                 error = gfs2_freeze_lock(sdp, &freeze_gh, 0);
1578                 if (error)
1579                         return -EINVAL;
1580 
1581                 if (fc->sb_flags & SB_RDONLY) {
1582                         gfs2_make_fs_ro(sdp);
1583                 } else {
1584                         error = gfs2_make_fs_rw(sdp);
1585                         if (error)
1586                                 errorfc(fc, "unable to remount read-write");
1587                 }
1588                 gfs2_freeze_unlock(&freeze_gh);
1589         }
1590         sdp->sd_args = *newargs;
1591 
1592         if (sdp->sd_args.ar_posix_acl)
1593                 sb->s_flags |= SB_POSIXACL;
1594         else
1595                 sb->s_flags &= ~SB_POSIXACL;
1596         if (sdp->sd_args.ar_nobarrier)
1597                 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1598         else
1599                 clear_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1600         spin_lock(&gt->gt_spin);
1601         gt->gt_logd_secs = newargs->ar_commit;
1602         gt->gt_quota_quantum = newargs->ar_quota_quantum;
1603         if (newargs->ar_statfs_quantum) {
1604                 gt->gt_statfs_slow = 0;
1605                 gt->gt_statfs_quantum = newargs->ar_statfs_quantum;
1606         }
1607         else {
1608                 gt->gt_statfs_slow = 1;
1609                 gt->gt_statfs_quantum = 30;
1610         }
1611         spin_unlock(&gt->gt_spin);
1612 
1613         gfs2_online_uevent(sdp);
1614         return error;
1615 }
1616 
1617 static const struct fs_context_operations gfs2_context_ops = {
1618         .free        = gfs2_fc_free,
1619         .parse_param = gfs2_parse_param,
1620         .get_tree    = gfs2_get_tree,
1621         .reconfigure = gfs2_reconfigure,
1622 };
1623 
1624 /* Set up the filesystem mount context */
1625 static int gfs2_init_fs_context(struct fs_context *fc)
1626 {
1627         struct gfs2_args *args;
1628 
1629         args = kmalloc(sizeof(*args), GFP_KERNEL);
1630         if (args == NULL)
1631                 return -ENOMEM;
1632 
1633         if (fc->purpose == FS_CONTEXT_FOR_RECONFIGURE) {
1634                 struct gfs2_sbd *sdp = fc->root->d_sb->s_fs_info;
1635 
1636                 *args = sdp->sd_args;
1637         } else {
1638                 memset(args, 0, sizeof(*args));
1639                 args->ar_quota = GFS2_QUOTA_DEFAULT;
1640                 args->ar_data = GFS2_DATA_DEFAULT;
1641                 args->ar_commit = 30;
1642                 args->ar_statfs_quantum = 30;
1643                 args->ar_quota_quantum = 60;
1644                 args->ar_errors = GFS2_ERRORS_DEFAULT;
1645         }
1646         fc->fs_private = args;
1647         fc->ops = &gfs2_context_ops;
1648         return 0;
1649 }
1650 
1651 static int set_meta_super(struct super_block *s, struct fs_context *fc)
1652 {
1653         return -EINVAL;
1654 }
1655 
1656 static int test_meta_super(struct super_block *s, struct fs_context *fc)
1657 {
1658         return (fc->sget_key == s->s_bdev);
1659 }
1660 
1661 static int gfs2_meta_get_tree(struct fs_context *fc)
1662 {
1663         struct super_block *s;
1664         struct gfs2_sbd *sdp;
1665         struct path path;
1666         int error;
1667 
1668         if (!fc->source || !*fc->source)
1669                 return -EINVAL;
1670 
1671         error = kern_path(fc->source, LOOKUP_FOLLOW, &path);
1672         if (error) {
1673                 pr_warn("path_lookup on %s returned error %d\n",
1674                         fc->source, error);
1675                 return error;
1676         }
1677         fc->fs_type = &gfs2_fs_type;
1678         fc->sget_key = path.dentry->d_sb->s_bdev;
1679         s = sget_fc(fc, test_meta_super, set_meta_super);
1680         path_put(&path);
1681         if (IS_ERR(s)) {
1682                 pr_warn("gfs2 mount does not exist\n");
1683                 return PTR_ERR(s);
1684         }
1685         if ((fc->sb_flags ^ s->s_flags) & SB_RDONLY) {
1686                 deactivate_locked_super(s);
1687                 return -EBUSY;
1688         }
1689         sdp = s->s_fs_info;
1690         fc->root = dget(sdp->sd_master_dir);
1691         return 0;
1692 }
1693 
1694 static const struct fs_context_operations gfs2_meta_context_ops = {
1695         .free        = gfs2_fc_free,
1696         .get_tree    = gfs2_meta_get_tree,
1697 };
1698 
1699 static int gfs2_meta_init_fs_context(struct fs_context *fc)
1700 {
1701         int ret = gfs2_init_fs_context(fc);
1702 
1703         if (ret)
1704                 return ret;
1705 
1706         fc->ops = &gfs2_meta_context_ops;
1707         return 0;
1708 }
1709 
1710 static void gfs2_kill_sb(struct super_block *sb)
1711 {
1712         struct gfs2_sbd *sdp = sb->s_fs_info;
1713 
1714         if (sdp == NULL) {
1715                 kill_block_super(sb);
1716                 return;
1717         }
1718 
1719         gfs2_log_flush(sdp, NULL, GFS2_LOG_HEAD_FLUSH_SYNC | GFS2_LFC_KILL_SB);
1720         dput(sdp->sd_root_dir);
1721         dput(sdp->sd_master_dir);
1722         sdp->sd_root_dir = NULL;
1723         sdp->sd_master_dir = NULL;
1724         shrink_dcache_sb(sb);
1725         kill_block_super(sb);
1726 }
1727 
1728 struct file_system_type gfs2_fs_type = {
1729         .name = "gfs2",
1730         .fs_flags = FS_REQUIRES_DEV,
1731         .init_fs_context = gfs2_init_fs_context,
1732         .parameters = gfs2_fs_parameters,
1733         .kill_sb = gfs2_kill_sb,
1734         .owner = THIS_MODULE,
1735 };
1736 MODULE_ALIAS_FS("gfs2");
1737 
1738 struct file_system_type gfs2meta_fs_type = {
1739         .name = "gfs2meta",
1740         .fs_flags = FS_REQUIRES_DEV,
1741         .init_fs_context = gfs2_meta_init_fs_context,
1742         .owner = THIS_MODULE,
1743 };
1744 MODULE_ALIAS_FS("gfs2meta");
1745 

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