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Linux/fs/gfs2/ops_fstype.c

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  1 /*
  2  * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
  3  * Copyright (C) 2004-2008 Red Hat, Inc.  All rights reserved.
  4  *
  5  * This copyrighted material is made available to anyone wishing to use,
  6  * modify, copy, or redistribute it subject to the terms and conditions
  7  * of the GNU General Public License version 2.
  8  */
  9 
 10 #include <linux/sched.h>
 11 #include <linux/slab.h>
 12 #include <linux/spinlock.h>
 13 #include <linux/completion.h>
 14 #include <linux/buffer_head.h>
 15 #include <linux/blkdev.h>
 16 #include <linux/kthread.h>
 17 #include <linux/export.h>
 18 #include <linux/namei.h>
 19 #include <linux/mount.h>
 20 #include <linux/gfs2_ondisk.h>
 21 #include <linux/quotaops.h>
 22 #include <linux/lockdep.h>
 23 #include <linux/module.h>
 24 
 25 #include "gfs2.h"
 26 #include "incore.h"
 27 #include "bmap.h"
 28 #include "glock.h"
 29 #include "glops.h"
 30 #include "inode.h"
 31 #include "recovery.h"
 32 #include "rgrp.h"
 33 #include "super.h"
 34 #include "sys.h"
 35 #include "util.h"
 36 #include "log.h"
 37 #include "quota.h"
 38 #include "dir.h"
 39 #include "trace_gfs2.h"
 40 
 41 #define DO 0
 42 #define UNDO 1
 43 
 44 /**
 45  * gfs2_tune_init - Fill a gfs2_tune structure with default values
 46  * @gt: tune
 47  *
 48  */
 49 
 50 static void gfs2_tune_init(struct gfs2_tune *gt)
 51 {
 52         spin_lock_init(&gt->gt_spin);
 53 
 54         gt->gt_quota_simul_sync = 64;
 55         gt->gt_quota_warn_period = 10;
 56         gt->gt_quota_scale_num = 1;
 57         gt->gt_quota_scale_den = 1;
 58         gt->gt_new_files_jdata = 0;
 59         gt->gt_max_readahead = 1 << 18;
 60         gt->gt_complain_secs = 10;
 61 }
 62 
 63 static struct gfs2_sbd *init_sbd(struct super_block *sb)
 64 {
 65         struct gfs2_sbd *sdp;
 66 
 67         sdp = kzalloc(sizeof(struct gfs2_sbd), GFP_KERNEL);
 68         if (!sdp)
 69                 return NULL;
 70 
 71         sb->s_fs_info = sdp;
 72         sdp->sd_vfs = sb;
 73         sdp->sd_lkstats = alloc_percpu(struct gfs2_pcpu_lkstats);
 74         if (!sdp->sd_lkstats) {
 75                 kfree(sdp);
 76                 return NULL;
 77         }
 78 
 79         set_bit(SDF_NOJOURNALID, &sdp->sd_flags);
 80         gfs2_tune_init(&sdp->sd_tune);
 81 
 82         init_waitqueue_head(&sdp->sd_glock_wait);
 83         atomic_set(&sdp->sd_glock_disposal, 0);
 84         init_completion(&sdp->sd_locking_init);
 85         init_completion(&sdp->sd_wdack);
 86         spin_lock_init(&sdp->sd_statfs_spin);
 87 
 88         spin_lock_init(&sdp->sd_rindex_spin);
 89         sdp->sd_rindex_tree.rb_node = NULL;
 90 
 91         INIT_LIST_HEAD(&sdp->sd_jindex_list);
 92         spin_lock_init(&sdp->sd_jindex_spin);
 93         mutex_init(&sdp->sd_jindex_mutex);
 94 
 95         INIT_LIST_HEAD(&sdp->sd_quota_list);
 96         mutex_init(&sdp->sd_quota_mutex);
 97         init_waitqueue_head(&sdp->sd_quota_wait);
 98         INIT_LIST_HEAD(&sdp->sd_trunc_list);
 99         spin_lock_init(&sdp->sd_trunc_lock);
100 
101         spin_lock_init(&sdp->sd_log_lock);
102         atomic_set(&sdp->sd_log_pinned, 0);
103         INIT_LIST_HEAD(&sdp->sd_log_le_buf);
104         INIT_LIST_HEAD(&sdp->sd_log_le_revoke);
105         INIT_LIST_HEAD(&sdp->sd_log_le_databuf);
106         INIT_LIST_HEAD(&sdp->sd_log_le_ordered);
107         spin_lock_init(&sdp->sd_ordered_lock);
108 
109         init_waitqueue_head(&sdp->sd_log_waitq);
110         init_waitqueue_head(&sdp->sd_logd_waitq);
111         spin_lock_init(&sdp->sd_ail_lock);
112         INIT_LIST_HEAD(&sdp->sd_ail1_list);
113         INIT_LIST_HEAD(&sdp->sd_ail2_list);
114 
115         init_rwsem(&sdp->sd_log_flush_lock);
116         atomic_set(&sdp->sd_log_in_flight, 0);
117         init_waitqueue_head(&sdp->sd_log_flush_wait);
118 
119         INIT_LIST_HEAD(&sdp->sd_revoke_list);
120 
121         return sdp;
122 }
123 
124 
125 /**
126  * gfs2_check_sb - Check superblock
127  * @sdp: the filesystem
128  * @sb: The superblock
129  * @silent: Don't print a message if the check fails
130  *
131  * Checks the version code of the FS is one that we understand how to
132  * read and that the sizes of the various on-disk structures have not
133  * changed.
134  */
135 
136 static int gfs2_check_sb(struct gfs2_sbd *sdp, int silent)
137 {
138         struct gfs2_sb_host *sb = &sdp->sd_sb;
139 
140         if (sb->sb_magic != GFS2_MAGIC ||
141             sb->sb_type != GFS2_METATYPE_SB) {
142                 if (!silent)
143                         printk(KERN_WARNING "GFS2: not a GFS2 filesystem\n");
144                 return -EINVAL;
145         }
146 
147         /*  If format numbers match exactly, we're done.  */
148 
149         if (sb->sb_fs_format == GFS2_FORMAT_FS &&
150             sb->sb_multihost_format == GFS2_FORMAT_MULTI)
151                 return 0;
152 
153         fs_warn(sdp, "Unknown on-disk format, unable to mount\n");
154 
155         return -EINVAL;
156 }
157 
158 static void end_bio_io_page(struct bio *bio, int error)
159 {
160         struct page *page = bio->bi_private;
161 
162         if (!error)
163                 SetPageUptodate(page);
164         else
165                 printk(KERN_WARNING "gfs2: error %d reading superblock\n", error);
166         unlock_page(page);
167 }
168 
169 static void gfs2_sb_in(struct gfs2_sbd *sdp, const void *buf)
170 {
171         struct gfs2_sb_host *sb = &sdp->sd_sb;
172         struct super_block *s = sdp->sd_vfs;
173         const struct gfs2_sb *str = buf;
174 
175         sb->sb_magic = be32_to_cpu(str->sb_header.mh_magic);
176         sb->sb_type = be32_to_cpu(str->sb_header.mh_type);
177         sb->sb_format = be32_to_cpu(str->sb_header.mh_format);
178         sb->sb_fs_format = be32_to_cpu(str->sb_fs_format);
179         sb->sb_multihost_format = be32_to_cpu(str->sb_multihost_format);
180         sb->sb_bsize = be32_to_cpu(str->sb_bsize);
181         sb->sb_bsize_shift = be32_to_cpu(str->sb_bsize_shift);
182         sb->sb_master_dir.no_addr = be64_to_cpu(str->sb_master_dir.no_addr);
183         sb->sb_master_dir.no_formal_ino = be64_to_cpu(str->sb_master_dir.no_formal_ino);
184         sb->sb_root_dir.no_addr = be64_to_cpu(str->sb_root_dir.no_addr);
185         sb->sb_root_dir.no_formal_ino = be64_to_cpu(str->sb_root_dir.no_formal_ino);
186 
187         memcpy(sb->sb_lockproto, str->sb_lockproto, GFS2_LOCKNAME_LEN);
188         memcpy(sb->sb_locktable, str->sb_locktable, GFS2_LOCKNAME_LEN);
189         memcpy(s->s_uuid, str->sb_uuid, 16);
190 }
191 
192 /**
193  * gfs2_read_super - Read the gfs2 super block from disk
194  * @sdp: The GFS2 super block
195  * @sector: The location of the super block
196  * @error: The error code to return
197  *
198  * This uses the bio functions to read the super block from disk
199  * because we want to be 100% sure that we never read cached data.
200  * A super block is read twice only during each GFS2 mount and is
201  * never written to by the filesystem. The first time its read no
202  * locks are held, and the only details which are looked at are those
203  * relating to the locking protocol. Once locking is up and working,
204  * the sb is read again under the lock to establish the location of
205  * the master directory (contains pointers to journals etc) and the
206  * root directory.
207  *
208  * Returns: 0 on success or error
209  */
210 
211 static int gfs2_read_super(struct gfs2_sbd *sdp, sector_t sector, int silent)
212 {
213         struct super_block *sb = sdp->sd_vfs;
214         struct gfs2_sb *p;
215         struct page *page;
216         struct bio *bio;
217 
218         page = alloc_page(GFP_NOFS);
219         if (unlikely(!page))
220                 return -ENOBUFS;
221 
222         ClearPageUptodate(page);
223         ClearPageDirty(page);
224         lock_page(page);
225 
226         bio = bio_alloc(GFP_NOFS, 1);
227         bio->bi_sector = sector * (sb->s_blocksize >> 9);
228         bio->bi_bdev = sb->s_bdev;
229         bio_add_page(bio, page, PAGE_SIZE, 0);
230 
231         bio->bi_end_io = end_bio_io_page;
232         bio->bi_private = page;
233         submit_bio(READ_SYNC | REQ_META, bio);
234         wait_on_page_locked(page);
235         bio_put(bio);
236         if (!PageUptodate(page)) {
237                 __free_page(page);
238                 return -EIO;
239         }
240         p = kmap(page);
241         gfs2_sb_in(sdp, p);
242         kunmap(page);
243         __free_page(page);
244         return gfs2_check_sb(sdp, silent);
245 }
246 
247 /**
248  * gfs2_read_sb - Read super block
249  * @sdp: The GFS2 superblock
250  * @silent: Don't print message if mount fails
251  *
252  */
253 
254 static int gfs2_read_sb(struct gfs2_sbd *sdp, int silent)
255 {
256         u32 hash_blocks, ind_blocks, leaf_blocks;
257         u32 tmp_blocks;
258         unsigned int x;
259         int error;
260 
261         error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
262         if (error) {
263                 if (!silent)
264                         fs_err(sdp, "can't read superblock\n");
265                 return error;
266         }
267 
268         sdp->sd_fsb2bb_shift = sdp->sd_sb.sb_bsize_shift -
269                                GFS2_BASIC_BLOCK_SHIFT;
270         sdp->sd_fsb2bb = 1 << sdp->sd_fsb2bb_shift;
271         sdp->sd_diptrs = (sdp->sd_sb.sb_bsize -
272                           sizeof(struct gfs2_dinode)) / sizeof(u64);
273         sdp->sd_inptrs = (sdp->sd_sb.sb_bsize -
274                           sizeof(struct gfs2_meta_header)) / sizeof(u64);
275         sdp->sd_jbsize = sdp->sd_sb.sb_bsize - sizeof(struct gfs2_meta_header);
276         sdp->sd_hash_bsize = sdp->sd_sb.sb_bsize / 2;
277         sdp->sd_hash_bsize_shift = sdp->sd_sb.sb_bsize_shift - 1;
278         sdp->sd_hash_ptrs = sdp->sd_hash_bsize / sizeof(u64);
279         sdp->sd_qc_per_block = (sdp->sd_sb.sb_bsize -
280                                 sizeof(struct gfs2_meta_header)) /
281                                 sizeof(struct gfs2_quota_change);
282         sdp->sd_blocks_per_bitmap = (sdp->sd_sb.sb_bsize -
283                                      sizeof(struct gfs2_meta_header))
284                 * GFS2_NBBY; /* not the rgrp bitmap, subsequent bitmaps only */
285 
286         /* Compute maximum reservation required to add a entry to a directory */
287 
288         hash_blocks = DIV_ROUND_UP(sizeof(u64) * (1 << GFS2_DIR_MAX_DEPTH),
289                              sdp->sd_jbsize);
290 
291         ind_blocks = 0;
292         for (tmp_blocks = hash_blocks; tmp_blocks > sdp->sd_diptrs;) {
293                 tmp_blocks = DIV_ROUND_UP(tmp_blocks, sdp->sd_inptrs);
294                 ind_blocks += tmp_blocks;
295         }
296 
297         leaf_blocks = 2 + GFS2_DIR_MAX_DEPTH;
298 
299         sdp->sd_max_dirres = hash_blocks + ind_blocks + leaf_blocks;
300 
301         sdp->sd_heightsize[0] = sdp->sd_sb.sb_bsize -
302                                 sizeof(struct gfs2_dinode);
303         sdp->sd_heightsize[1] = sdp->sd_sb.sb_bsize * sdp->sd_diptrs;
304         for (x = 2;; x++) {
305                 u64 space, d;
306                 u32 m;
307 
308                 space = sdp->sd_heightsize[x - 1] * sdp->sd_inptrs;
309                 d = space;
310                 m = do_div(d, sdp->sd_inptrs);
311 
312                 if (d != sdp->sd_heightsize[x - 1] || m)
313                         break;
314                 sdp->sd_heightsize[x] = space;
315         }
316         sdp->sd_max_height = x;
317         sdp->sd_heightsize[x] = ~0;
318         gfs2_assert(sdp, sdp->sd_max_height <= GFS2_MAX_META_HEIGHT);
319 
320         sdp->sd_jheightsize[0] = sdp->sd_sb.sb_bsize -
321                                  sizeof(struct gfs2_dinode);
322         sdp->sd_jheightsize[1] = sdp->sd_jbsize * sdp->sd_diptrs;
323         for (x = 2;; x++) {
324                 u64 space, d;
325                 u32 m;
326 
327                 space = sdp->sd_jheightsize[x - 1] * sdp->sd_inptrs;
328                 d = space;
329                 m = do_div(d, sdp->sd_inptrs);
330 
331                 if (d != sdp->sd_jheightsize[x - 1] || m)
332                         break;
333                 sdp->sd_jheightsize[x] = space;
334         }
335         sdp->sd_max_jheight = x;
336         sdp->sd_jheightsize[x] = ~0;
337         gfs2_assert(sdp, sdp->sd_max_jheight <= GFS2_MAX_META_HEIGHT);
338 
339         return 0;
340 }
341 
342 static int init_names(struct gfs2_sbd *sdp, int silent)
343 {
344         char *proto, *table;
345         int error = 0;
346 
347         proto = sdp->sd_args.ar_lockproto;
348         table = sdp->sd_args.ar_locktable;
349 
350         /*  Try to autodetect  */
351 
352         if (!proto[0] || !table[0]) {
353                 error = gfs2_read_super(sdp, GFS2_SB_ADDR >> sdp->sd_fsb2bb_shift, silent);
354                 if (error)
355                         return error;
356 
357                 if (!proto[0])
358                         proto = sdp->sd_sb.sb_lockproto;
359                 if (!table[0])
360                         table = sdp->sd_sb.sb_locktable;
361         }
362 
363         if (!table[0])
364                 table = sdp->sd_vfs->s_id;
365 
366         strlcpy(sdp->sd_proto_name, proto, GFS2_FSNAME_LEN);
367         strlcpy(sdp->sd_table_name, table, GFS2_FSNAME_LEN);
368 
369         table = sdp->sd_table_name;
370         while ((table = strchr(table, '/')))
371                 *table = '_';
372 
373         return error;
374 }
375 
376 static int init_locking(struct gfs2_sbd *sdp, struct gfs2_holder *mount_gh,
377                         int undo)
378 {
379         int error = 0;
380 
381         if (undo)
382                 goto fail_trans;
383 
384         error = gfs2_glock_nq_num(sdp,
385                                   GFS2_MOUNT_LOCK, &gfs2_nondisk_glops,
386                                   LM_ST_EXCLUSIVE, LM_FLAG_NOEXP | GL_NOCACHE,
387                                   mount_gh);
388         if (error) {
389                 fs_err(sdp, "can't acquire mount glock: %d\n", error);
390                 goto fail;
391         }
392 
393         error = gfs2_glock_nq_num(sdp,
394                                   GFS2_LIVE_LOCK, &gfs2_nondisk_glops,
395                                   LM_ST_SHARED,
396                                   LM_FLAG_NOEXP | GL_EXACT,
397                                   &sdp->sd_live_gh);
398         if (error) {
399                 fs_err(sdp, "can't acquire live glock: %d\n", error);
400                 goto fail_mount;
401         }
402 
403         error = gfs2_glock_get(sdp, GFS2_RENAME_LOCK, &gfs2_nondisk_glops,
404                                CREATE, &sdp->sd_rename_gl);
405         if (error) {
406                 fs_err(sdp, "can't create rename glock: %d\n", error);
407                 goto fail_live;
408         }
409 
410         error = gfs2_glock_get(sdp, GFS2_TRANS_LOCK, &gfs2_trans_glops,
411                                CREATE, &sdp->sd_trans_gl);
412         if (error) {
413                 fs_err(sdp, "can't create transaction glock: %d\n", error);
414                 goto fail_rename;
415         }
416 
417         return 0;
418 
419 fail_trans:
420         gfs2_glock_put(sdp->sd_trans_gl);
421 fail_rename:
422         gfs2_glock_put(sdp->sd_rename_gl);
423 fail_live:
424         gfs2_glock_dq_uninit(&sdp->sd_live_gh);
425 fail_mount:
426         gfs2_glock_dq_uninit(mount_gh);
427 fail:
428         return error;
429 }
430 
431 static int gfs2_lookup_root(struct super_block *sb, struct dentry **dptr,
432                             u64 no_addr, const char *name)
433 {
434         struct gfs2_sbd *sdp = sb->s_fs_info;
435         struct dentry *dentry;
436         struct inode *inode;
437 
438         inode = gfs2_inode_lookup(sb, DT_DIR, no_addr, 0, 0);
439         if (IS_ERR(inode)) {
440                 fs_err(sdp, "can't read in %s inode: %ld\n", name, PTR_ERR(inode));
441                 return PTR_ERR(inode);
442         }
443         dentry = d_make_root(inode);
444         if (!dentry) {
445                 fs_err(sdp, "can't alloc %s dentry\n", name);
446                 return -ENOMEM;
447         }
448         *dptr = dentry;
449         return 0;
450 }
451 
452 static int init_sb(struct gfs2_sbd *sdp, int silent)
453 {
454         struct super_block *sb = sdp->sd_vfs;
455         struct gfs2_holder sb_gh;
456         u64 no_addr;
457         int ret;
458 
459         ret = gfs2_glock_nq_num(sdp, GFS2_SB_LOCK, &gfs2_meta_glops,
460                                 LM_ST_SHARED, 0, &sb_gh);
461         if (ret) {
462                 fs_err(sdp, "can't acquire superblock glock: %d\n", ret);
463                 return ret;
464         }
465 
466         ret = gfs2_read_sb(sdp, silent);
467         if (ret) {
468                 fs_err(sdp, "can't read superblock: %d\n", ret);
469                 goto out;
470         }
471 
472         /* Set up the buffer cache and SB for real */
473         if (sdp->sd_sb.sb_bsize < bdev_logical_block_size(sb->s_bdev)) {
474                 ret = -EINVAL;
475                 fs_err(sdp, "FS block size (%u) is too small for device "
476                        "block size (%u)\n",
477                        sdp->sd_sb.sb_bsize, bdev_logical_block_size(sb->s_bdev));
478                 goto out;
479         }
480         if (sdp->sd_sb.sb_bsize > PAGE_SIZE) {
481                 ret = -EINVAL;
482                 fs_err(sdp, "FS block size (%u) is too big for machine "
483                        "page size (%u)\n",
484                        sdp->sd_sb.sb_bsize, (unsigned int)PAGE_SIZE);
485                 goto out;
486         }
487         sb_set_blocksize(sb, sdp->sd_sb.sb_bsize);
488 
489         /* Get the root inode */
490         no_addr = sdp->sd_sb.sb_root_dir.no_addr;
491         ret = gfs2_lookup_root(sb, &sdp->sd_root_dir, no_addr, "root");
492         if (ret)
493                 goto out;
494 
495         /* Get the master inode */
496         no_addr = sdp->sd_sb.sb_master_dir.no_addr;
497         ret = gfs2_lookup_root(sb, &sdp->sd_master_dir, no_addr, "master");
498         if (ret) {
499                 dput(sdp->sd_root_dir);
500                 goto out;
501         }
502         sb->s_root = dget(sdp->sd_args.ar_meta ? sdp->sd_master_dir : sdp->sd_root_dir);
503 out:
504         gfs2_glock_dq_uninit(&sb_gh);
505         return ret;
506 }
507 
508 /**
509  * map_journal_extents - create a reusable "extent" mapping from all logical
510  * blocks to all physical blocks for the given journal.  This will save
511  * us time when writing journal blocks.  Most journals will have only one
512  * extent that maps all their logical blocks.  That's because gfs2.mkfs
513  * arranges the journal blocks sequentially to maximize performance.
514  * So the extent would map the first block for the entire file length.
515  * However, gfs2_jadd can happen while file activity is happening, so
516  * those journals may not be sequential.  Less likely is the case where
517  * the users created their own journals by mounting the metafs and
518  * laying it out.  But it's still possible.  These journals might have
519  * several extents.
520  *
521  * TODO: This should be done in bigger chunks rather than one block at a time,
522  *       but since it's only done at mount time, I'm not worried about the
523  *       time it takes.
524  */
525 static int map_journal_extents(struct gfs2_sbd *sdp)
526 {
527         struct gfs2_jdesc *jd = sdp->sd_jdesc;
528         unsigned int lb;
529         u64 db, prev_db; /* logical block, disk block, prev disk block */
530         struct gfs2_inode *ip = GFS2_I(jd->jd_inode);
531         struct gfs2_journal_extent *jext = NULL;
532         struct buffer_head bh;
533         int rc = 0;
534 
535         prev_db = 0;
536 
537         for (lb = 0; lb < i_size_read(jd->jd_inode) >> sdp->sd_sb.sb_bsize_shift; lb++) {
538                 bh.b_state = 0;
539                 bh.b_blocknr = 0;
540                 bh.b_size = 1 << ip->i_inode.i_blkbits;
541                 rc = gfs2_block_map(jd->jd_inode, lb, &bh, 0);
542                 db = bh.b_blocknr;
543                 if (rc || !db) {
544                         printk(KERN_INFO "GFS2 journal mapping error %d: lb="
545                                "%u db=%llu\n", rc, lb, (unsigned long long)db);
546                         break;
547                 }
548                 if (!prev_db || db != prev_db + 1) {
549                         jext = kzalloc(sizeof(struct gfs2_journal_extent),
550                                        GFP_KERNEL);
551                         if (!jext) {
552                                 printk(KERN_INFO "GFS2 error: out of memory "
553                                        "mapping journal extents.\n");
554                                 rc = -ENOMEM;
555                                 break;
556                         }
557                         jext->dblock = db;
558                         jext->lblock = lb;
559                         jext->blocks = 1;
560                         list_add_tail(&jext->extent_list, &jd->extent_list);
561                 } else {
562                         jext->blocks++;
563                 }
564                 prev_db = db;
565         }
566         return rc;
567 }
568 
569 static void gfs2_others_may_mount(struct gfs2_sbd *sdp)
570 {
571         char *message = "FIRSTMOUNT=Done";
572         char *envp[] = { message, NULL };
573 
574         fs_info(sdp, "first mount done, others may mount\n");
575 
576         if (sdp->sd_lockstruct.ls_ops->lm_first_done)
577                 sdp->sd_lockstruct.ls_ops->lm_first_done(sdp);
578 
579         kobject_uevent_env(&sdp->sd_kobj, KOBJ_CHANGE, envp);
580 }
581 
582 /**
583  * gfs2_jindex_hold - Grab a lock on the jindex
584  * @sdp: The GFS2 superblock
585  * @ji_gh: the holder for the jindex glock
586  *
587  * Returns: errno
588  */
589 
590 static int gfs2_jindex_hold(struct gfs2_sbd *sdp, struct gfs2_holder *ji_gh)
591 {
592         struct gfs2_inode *dip = GFS2_I(sdp->sd_jindex);
593         struct qstr name;
594         char buf[20];
595         struct gfs2_jdesc *jd;
596         int error;
597 
598         name.name = buf;
599 
600         mutex_lock(&sdp->sd_jindex_mutex);
601 
602         for (;;) {
603                 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, ji_gh);
604                 if (error)
605                         break;
606 
607                 name.len = sprintf(buf, "journal%u", sdp->sd_journals);
608                 name.hash = gfs2_disk_hash(name.name, name.len);
609 
610                 error = gfs2_dir_check(sdp->sd_jindex, &name, NULL);
611                 if (error == -ENOENT) {
612                         error = 0;
613                         break;
614                 }
615 
616                 gfs2_glock_dq_uninit(ji_gh);
617 
618                 if (error)
619                         break;
620 
621                 error = -ENOMEM;
622                 jd = kzalloc(sizeof(struct gfs2_jdesc), GFP_KERNEL);
623                 if (!jd)
624                         break;
625 
626                 INIT_LIST_HEAD(&jd->extent_list);
627                 INIT_WORK(&jd->jd_work, gfs2_recover_func);
628                 jd->jd_inode = gfs2_lookupi(sdp->sd_jindex, &name, 1);
629                 if (!jd->jd_inode || IS_ERR(jd->jd_inode)) {
630                         if (!jd->jd_inode)
631                                 error = -ENOENT;
632                         else
633                                 error = PTR_ERR(jd->jd_inode);
634                         kfree(jd);
635                         break;
636                 }
637 
638                 spin_lock(&sdp->sd_jindex_spin);
639                 jd->jd_jid = sdp->sd_journals++;
640                 list_add_tail(&jd->jd_list, &sdp->sd_jindex_list);
641                 spin_unlock(&sdp->sd_jindex_spin);
642         }
643 
644         mutex_unlock(&sdp->sd_jindex_mutex);
645 
646         return error;
647 }
648 
649 /**
650  * check_journal_clean - Make sure a journal is clean for a spectator mount
651  * @sdp: The GFS2 superblock
652  * @jd: The journal descriptor
653  *
654  * Returns: 0 if the journal is clean or locked, else an error
655  */
656 static int check_journal_clean(struct gfs2_sbd *sdp, struct gfs2_jdesc *jd)
657 {
658         int error;
659         struct gfs2_holder j_gh;
660         struct gfs2_log_header_host head;
661         struct gfs2_inode *ip;
662 
663         ip = GFS2_I(jd->jd_inode);
664         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_NOEXP |
665                                    GL_EXACT | GL_NOCACHE, &j_gh);
666         if (error) {
667                 fs_err(sdp, "Error locking journal for spectator mount.\n");
668                 return -EPERM;
669         }
670         error = gfs2_jdesc_check(jd);
671         if (error) {
672                 fs_err(sdp, "Error checking journal for spectator mount.\n");
673                 goto out_unlock;
674         }
675         error = gfs2_find_jhead(jd, &head);
676         if (error) {
677                 fs_err(sdp, "Error parsing journal for spectator mount.\n");
678                 goto out_unlock;
679         }
680         if (!(head.lh_flags & GFS2_LOG_HEAD_UNMOUNT)) {
681                 error = -EPERM;
682                 fs_err(sdp, "jid=%u: Journal is dirty, so the first mounter "
683                        "must not be a spectator.\n", jd->jd_jid);
684         }
685 
686 out_unlock:
687         gfs2_glock_dq_uninit(&j_gh);
688         return error;
689 }
690 
691 static int init_journal(struct gfs2_sbd *sdp, int undo)
692 {
693         struct inode *master = sdp->sd_master_dir->d_inode;
694         struct gfs2_holder ji_gh;
695         struct gfs2_inode *ip;
696         int jindex = 1;
697         int error = 0;
698 
699         if (undo) {
700                 jindex = 0;
701                 goto fail_jinode_gh;
702         }
703 
704         sdp->sd_jindex = gfs2_lookup_simple(master, "jindex");
705         if (IS_ERR(sdp->sd_jindex)) {
706                 fs_err(sdp, "can't lookup journal index: %d\n", error);
707                 return PTR_ERR(sdp->sd_jindex);
708         }
709 
710         /* Load in the journal index special file */
711 
712         error = gfs2_jindex_hold(sdp, &ji_gh);
713         if (error) {
714                 fs_err(sdp, "can't read journal index: %d\n", error);
715                 goto fail;
716         }
717 
718         error = -EUSERS;
719         if (!gfs2_jindex_size(sdp)) {
720                 fs_err(sdp, "no journals!\n");
721                 goto fail_jindex;
722         }
723 
724         if (sdp->sd_args.ar_spectator) {
725                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, 0);
726                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
727                 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
728                 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
729         } else {
730                 if (sdp->sd_lockstruct.ls_jid >= gfs2_jindex_size(sdp)) {
731                         fs_err(sdp, "can't mount journal #%u\n",
732                                sdp->sd_lockstruct.ls_jid);
733                         fs_err(sdp, "there are only %u journals (0 - %u)\n",
734                                gfs2_jindex_size(sdp),
735                                gfs2_jindex_size(sdp) - 1);
736                         goto fail_jindex;
737                 }
738                 sdp->sd_jdesc = gfs2_jdesc_find(sdp, sdp->sd_lockstruct.ls_jid);
739 
740                 error = gfs2_glock_nq_num(sdp, sdp->sd_lockstruct.ls_jid,
741                                           &gfs2_journal_glops,
742                                           LM_ST_EXCLUSIVE, LM_FLAG_NOEXP,
743                                           &sdp->sd_journal_gh);
744                 if (error) {
745                         fs_err(sdp, "can't acquire journal glock: %d\n", error);
746                         goto fail_jindex;
747                 }
748 
749                 ip = GFS2_I(sdp->sd_jdesc->jd_inode);
750                 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED,
751                                            LM_FLAG_NOEXP | GL_EXACT | GL_NOCACHE,
752                                            &sdp->sd_jinode_gh);
753                 if (error) {
754                         fs_err(sdp, "can't acquire journal inode glock: %d\n",
755                                error);
756                         goto fail_journal_gh;
757                 }
758 
759                 error = gfs2_jdesc_check(sdp->sd_jdesc);
760                 if (error) {
761                         fs_err(sdp, "my journal (%u) is bad: %d\n",
762                                sdp->sd_jdesc->jd_jid, error);
763                         goto fail_jinode_gh;
764                 }
765                 atomic_set(&sdp->sd_log_blks_free, sdp->sd_jdesc->jd_blocks);
766                 atomic_set(&sdp->sd_log_thresh1, 2*sdp->sd_jdesc->jd_blocks/5);
767                 atomic_set(&sdp->sd_log_thresh2, 4*sdp->sd_jdesc->jd_blocks/5);
768 
769                 /* Map the extents for this journal's blocks */
770                 map_journal_extents(sdp);
771         }
772         trace_gfs2_log_blocks(sdp, atomic_read(&sdp->sd_log_blks_free));
773 
774         if (sdp->sd_lockstruct.ls_first) {
775                 unsigned int x;
776                 for (x = 0; x < sdp->sd_journals; x++) {
777                         struct gfs2_jdesc *jd = gfs2_jdesc_find(sdp, x);
778 
779                         if (sdp->sd_args.ar_spectator) {
780                                 error = check_journal_clean(sdp, jd);
781                                 if (error)
782                                         goto fail_jinode_gh;
783                                 continue;
784                         }
785                         error = gfs2_recover_journal(jd, true);
786                         if (error) {
787                                 fs_err(sdp, "error recovering journal %u: %d\n",
788                                        x, error);
789                                 goto fail_jinode_gh;
790                         }
791                 }
792 
793                 gfs2_others_may_mount(sdp);
794         } else if (!sdp->sd_args.ar_spectator) {
795                 error = gfs2_recover_journal(sdp->sd_jdesc, true);
796                 if (error) {
797                         fs_err(sdp, "error recovering my journal: %d\n", error);
798                         goto fail_jinode_gh;
799                 }
800         }
801 
802         set_bit(SDF_JOURNAL_CHECKED, &sdp->sd_flags);
803         gfs2_glock_dq_uninit(&ji_gh);
804         jindex = 0;
805 
806         return 0;
807 
808 fail_jinode_gh:
809         if (!sdp->sd_args.ar_spectator)
810                 gfs2_glock_dq_uninit(&sdp->sd_jinode_gh);
811 fail_journal_gh:
812         if (!sdp->sd_args.ar_spectator)
813                 gfs2_glock_dq_uninit(&sdp->sd_journal_gh);
814 fail_jindex:
815         gfs2_jindex_free(sdp);
816         if (jindex)
817                 gfs2_glock_dq_uninit(&ji_gh);
818 fail:
819         iput(sdp->sd_jindex);
820         return error;
821 }
822 
823 static struct lock_class_key gfs2_quota_imutex_key;
824 
825 static int init_inodes(struct gfs2_sbd *sdp, int undo)
826 {
827         int error = 0;
828         struct inode *master = sdp->sd_master_dir->d_inode;
829 
830         if (undo)
831                 goto fail_qinode;
832 
833         error = init_journal(sdp, undo);
834         if (error)
835                 goto fail;
836 
837         /* Read in the master statfs inode */
838         sdp->sd_statfs_inode = gfs2_lookup_simple(master, "statfs");
839         if (IS_ERR(sdp->sd_statfs_inode)) {
840                 error = PTR_ERR(sdp->sd_statfs_inode);
841                 fs_err(sdp, "can't read in statfs inode: %d\n", error);
842                 goto fail_journal;
843         }
844 
845         /* Read in the resource index inode */
846         sdp->sd_rindex = gfs2_lookup_simple(master, "rindex");
847         if (IS_ERR(sdp->sd_rindex)) {
848                 error = PTR_ERR(sdp->sd_rindex);
849                 fs_err(sdp, "can't get resource index inode: %d\n", error);
850                 goto fail_statfs;
851         }
852         sdp->sd_rindex_uptodate = 0;
853 
854         /* Read in the quota inode */
855         sdp->sd_quota_inode = gfs2_lookup_simple(master, "quota");
856         if (IS_ERR(sdp->sd_quota_inode)) {
857                 error = PTR_ERR(sdp->sd_quota_inode);
858                 fs_err(sdp, "can't get quota file inode: %d\n", error);
859                 goto fail_rindex;
860         }
861         /*
862          * i_mutex on quota files is special. Since this inode is hidden system
863          * file, we are safe to define locking ourselves.
864          */
865         lockdep_set_class(&sdp->sd_quota_inode->i_mutex,
866                           &gfs2_quota_imutex_key);
867 
868         error = gfs2_rindex_update(sdp);
869         if (error)
870                 goto fail_qinode;
871 
872         return 0;
873 
874 fail_qinode:
875         iput(sdp->sd_quota_inode);
876 fail_rindex:
877         gfs2_clear_rgrpd(sdp);
878         iput(sdp->sd_rindex);
879 fail_statfs:
880         iput(sdp->sd_statfs_inode);
881 fail_journal:
882         init_journal(sdp, UNDO);
883 fail:
884         return error;
885 }
886 
887 static int init_per_node(struct gfs2_sbd *sdp, int undo)
888 {
889         struct inode *pn = NULL;
890         char buf[30];
891         int error = 0;
892         struct gfs2_inode *ip;
893         struct inode *master = sdp->sd_master_dir->d_inode;
894 
895         if (sdp->sd_args.ar_spectator)
896                 return 0;
897 
898         if (undo)
899                 goto fail_qc_gh;
900 
901         pn = gfs2_lookup_simple(master, "per_node");
902         if (IS_ERR(pn)) {
903                 error = PTR_ERR(pn);
904                 fs_err(sdp, "can't find per_node directory: %d\n", error);
905                 return error;
906         }
907 
908         sprintf(buf, "statfs_change%u", sdp->sd_jdesc->jd_jid);
909         sdp->sd_sc_inode = gfs2_lookup_simple(pn, buf);
910         if (IS_ERR(sdp->sd_sc_inode)) {
911                 error = PTR_ERR(sdp->sd_sc_inode);
912                 fs_err(sdp, "can't find local \"sc\" file: %d\n", error);
913                 goto fail;
914         }
915 
916         sprintf(buf, "quota_change%u", sdp->sd_jdesc->jd_jid);
917         sdp->sd_qc_inode = gfs2_lookup_simple(pn, buf);
918         if (IS_ERR(sdp->sd_qc_inode)) {
919                 error = PTR_ERR(sdp->sd_qc_inode);
920                 fs_err(sdp, "can't find local \"qc\" file: %d\n", error);
921                 goto fail_ut_i;
922         }
923 
924         iput(pn);
925         pn = NULL;
926 
927         ip = GFS2_I(sdp->sd_sc_inode);
928         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
929                                    &sdp->sd_sc_gh);
930         if (error) {
931                 fs_err(sdp, "can't lock local \"sc\" file: %d\n", error);
932                 goto fail_qc_i;
933         }
934 
935         ip = GFS2_I(sdp->sd_qc_inode);
936         error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0,
937                                    &sdp->sd_qc_gh);
938         if (error) {
939                 fs_err(sdp, "can't lock local \"qc\" file: %d\n", error);
940                 goto fail_ut_gh;
941         }
942 
943         return 0;
944 
945 fail_qc_gh:
946         gfs2_glock_dq_uninit(&sdp->sd_qc_gh);
947 fail_ut_gh:
948         gfs2_glock_dq_uninit(&sdp->sd_sc_gh);
949 fail_qc_i:
950         iput(sdp->sd_qc_inode);
951 fail_ut_i:
952         iput(sdp->sd_sc_inode);
953 fail:
954         if (pn)
955                 iput(pn);
956         return error;
957 }
958 
959 static int init_threads(struct gfs2_sbd *sdp, int undo)
960 {
961         struct task_struct *p;
962         int error = 0;
963 
964         if (undo)
965                 goto fail_quotad;
966 
967         p = kthread_run(gfs2_logd, sdp, "gfs2_logd");
968         if (IS_ERR(p)) {
969                 error = PTR_ERR(p);
970                 fs_err(sdp, "can't start logd thread: %d\n", error);
971                 return error;
972         }
973         sdp->sd_logd_process = p;
974 
975         p = kthread_run(gfs2_quotad, sdp, "gfs2_quotad");
976         if (IS_ERR(p)) {
977                 error = PTR_ERR(p);
978                 fs_err(sdp, "can't start quotad thread: %d\n", error);
979                 goto fail;
980         }
981         sdp->sd_quotad_process = p;
982 
983         return 0;
984 
985 
986 fail_quotad:
987         kthread_stop(sdp->sd_quotad_process);
988 fail:
989         kthread_stop(sdp->sd_logd_process);
990         return error;
991 }
992 
993 static const match_table_t nolock_tokens = {
994         { Opt_jid, "jid=%d\n", },
995         { Opt_err, NULL },
996 };
997 
998 static const struct lm_lockops nolock_ops = {
999         .lm_proto_name = "lock_nolock",
1000         .lm_put_lock = gfs2_glock_free,
1001         .lm_tokens = &nolock_tokens,
1002 };
1003 
1004 /**
1005  * gfs2_lm_mount - mount a locking protocol
1006  * @sdp: the filesystem
1007  * @args: mount arguments
1008  * @silent: if 1, don't complain if the FS isn't a GFS2 fs
1009  *
1010  * Returns: errno
1011  */
1012 
1013 static int gfs2_lm_mount(struct gfs2_sbd *sdp, int silent)
1014 {
1015         const struct lm_lockops *lm;
1016         struct lm_lockstruct *ls = &sdp->sd_lockstruct;
1017         struct gfs2_args *args = &sdp->sd_args;
1018         const char *proto = sdp->sd_proto_name;
1019         const char *table = sdp->sd_table_name;
1020         char *o, *options;
1021         int ret;
1022 
1023         if (!strcmp("lock_nolock", proto)) {
1024                 lm = &nolock_ops;
1025                 sdp->sd_args.ar_localflocks = 1;
1026 #ifdef CONFIG_GFS2_FS_LOCKING_DLM
1027         } else if (!strcmp("lock_dlm", proto)) {
1028                 lm = &gfs2_dlm_ops;
1029 #endif
1030         } else {
1031                 printk(KERN_INFO "GFS2: can't find protocol %s\n", proto);
1032                 return -ENOENT;
1033         }
1034 
1035         fs_info(sdp, "Trying to join cluster \"%s\", \"%s\"\n", proto, table);
1036 
1037         ls->ls_ops = lm;
1038         ls->ls_first = 1;
1039 
1040         for (options = args->ar_hostdata; (o = strsep(&options, ":")); ) {
1041                 substring_t tmp[MAX_OPT_ARGS];
1042                 int token, option;
1043 
1044                 if (!o || !*o)
1045                         continue;
1046 
1047                 token = match_token(o, *lm->lm_tokens, tmp);
1048                 switch (token) {
1049                 case Opt_jid:
1050                         ret = match_int(&tmp[0], &option);
1051                         if (ret || option < 0) 
1052                                 goto hostdata_error;
1053                         if (test_and_clear_bit(SDF_NOJOURNALID, &sdp->sd_flags))
1054                                 ls->ls_jid = option;
1055                         break;
1056                 case Opt_id:
1057                 case Opt_nodir:
1058                         /* Obsolete, but left for backward compat purposes */
1059                         break;
1060                 case Opt_first:
1061                         ret = match_int(&tmp[0], &option);
1062                         if (ret || (option != 0 && option != 1))
1063                                 goto hostdata_error;
1064                         ls->ls_first = option;
1065                         break;
1066                 case Opt_err:
1067                 default:
1068 hostdata_error:
1069                         fs_info(sdp, "unknown hostdata (%s)\n", o);
1070                         return -EINVAL;
1071                 }
1072         }
1073 
1074         if (lm->lm_mount == NULL) {
1075                 fs_info(sdp, "Now mounting FS...\n");
1076                 complete_all(&sdp->sd_locking_init);
1077                 return 0;
1078         }
1079         ret = lm->lm_mount(sdp, table);
1080         if (ret == 0)
1081                 fs_info(sdp, "Joined cluster. Now mounting FS...\n");
1082         complete_all(&sdp->sd_locking_init);
1083         return ret;
1084 }
1085 
1086 void gfs2_lm_unmount(struct gfs2_sbd *sdp)
1087 {
1088         const struct lm_lockops *lm = sdp->sd_lockstruct.ls_ops;
1089         if (likely(!test_bit(SDF_SHUTDOWN, &sdp->sd_flags)) &&
1090             lm->lm_unmount)
1091                 lm->lm_unmount(sdp);
1092 }
1093 
1094 static int gfs2_journalid_wait(void *word)
1095 {
1096         if (signal_pending(current))
1097                 return -EINTR;
1098         schedule();
1099         return 0;
1100 }
1101 
1102 static int wait_on_journal(struct gfs2_sbd *sdp)
1103 {
1104         if (sdp->sd_lockstruct.ls_ops->lm_mount == NULL)
1105                 return 0;
1106 
1107         return wait_on_bit(&sdp->sd_flags, SDF_NOJOURNALID, gfs2_journalid_wait, TASK_INTERRUPTIBLE);
1108 }
1109 
1110 void gfs2_online_uevent(struct gfs2_sbd *sdp)
1111 {
1112         struct super_block *sb = sdp->sd_vfs;
1113         char ro[20];
1114         char spectator[20];
1115         char *envp[] = { ro, spectator, NULL };
1116         sprintf(ro, "RDONLY=%d", (sb->s_flags & MS_RDONLY) ? 1 : 0);
1117         sprintf(spectator, "SPECTATOR=%d", sdp->sd_args.ar_spectator ? 1 : 0);
1118         kobject_uevent_env(&sdp->sd_kobj, KOBJ_ONLINE, envp);
1119 }
1120 
1121 /**
1122  * fill_super - Read in superblock
1123  * @sb: The VFS superblock
1124  * @data: Mount options
1125  * @silent: Don't complain if it's not a GFS2 filesystem
1126  *
1127  * Returns: errno
1128  */
1129 
1130 static int fill_super(struct super_block *sb, struct gfs2_args *args, int silent)
1131 {
1132         struct gfs2_sbd *sdp;
1133         struct gfs2_holder mount_gh;
1134         int error;
1135 
1136         sdp = init_sbd(sb);
1137         if (!sdp) {
1138                 printk(KERN_WARNING "GFS2: 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 |= MS_RDONLY;
1145                 set_bit(SDF_RORECOVERY, &sdp->sd_flags);
1146         }
1147         if (sdp->sd_args.ar_posix_acl)
1148                 sb->s_flags |= MS_POSIXACL;
1149         if (sdp->sd_args.ar_nobarrier)
1150                 set_bit(SDF_NOBARRIERS, &sdp->sd_flags);
1151 
1152         sb->s_flags |= MS_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_xattr = gfs2_xattr_handlers;
1158         sb->s_qcop = &gfs2_quotactl_ops;
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 = 1 << 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                 /* In this case, we haven't initialized sysfs, so we have to
1184                    manually free the sdp. */
1185                 free_percpu(sdp->sd_lkstats);
1186                 kfree(sdp);
1187                 sb->s_fs_info = NULL;
1188                 return error;
1189         }
1190 
1191         snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s", sdp->sd_table_name);
1192 
1193         error = gfs2_sys_fs_add(sdp);
1194         /*
1195          * If we hit an error here, gfs2_sys_fs_add will have called function
1196          * kobject_put which causes the sysfs usage count to go to zero, which
1197          * causes sysfs to call function gfs2_sbd_release, which frees sdp.
1198          * Subsequent error paths here will call gfs2_sys_fs_del, which also
1199          * kobject_put to free sdp.
1200          */
1201         if (error)
1202                 return error;
1203 
1204         gfs2_create_debugfs_file(sdp);
1205 
1206         error = gfs2_lm_mount(sdp, silent);
1207         if (error)
1208                 goto fail_debug;
1209 
1210         error = init_locking(sdp, &mount_gh, DO);
1211         if (error)
1212                 goto fail_lm;
1213 
1214         error = init_sb(sdp, silent);
1215         if (error)
1216                 goto fail_locking;
1217 
1218         error = wait_on_journal(sdp);
1219         if (error)
1220                 goto fail_sb;
1221 
1222         /*
1223          * If user space has failed to join the cluster or some similar
1224          * failure has occurred, then the journal id will contain a
1225          * negative (error) number. This will then be returned to the
1226          * caller (of the mount syscall). We do this even for spectator
1227          * mounts (which just write a jid of 0 to indicate "ok" even though
1228          * the jid is unused in the spectator case)
1229          */
1230         if (sdp->sd_lockstruct.ls_jid < 0) {
1231                 error = sdp->sd_lockstruct.ls_jid;
1232                 sdp->sd_lockstruct.ls_jid = 0;
1233                 goto fail_sb;
1234         }
1235 
1236         if (sdp->sd_args.ar_spectator)
1237                 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.s",
1238                          sdp->sd_table_name);
1239         else
1240                 snprintf(sdp->sd_fsname, GFS2_FSNAME_LEN, "%s.%u",
1241                          sdp->sd_table_name, sdp->sd_lockstruct.ls_jid);
1242 
1243         error = init_inodes(sdp, DO);
1244         if (error)
1245                 goto fail_sb;
1246 
1247         error = init_per_node(sdp, DO);
1248         if (error)
1249                 goto fail_inodes;
1250 
1251         error = gfs2_statfs_init(sdp);
1252         if (error) {
1253                 fs_err(sdp, "can't initialize statfs subsystem: %d\n", error);
1254                 goto fail_per_node;
1255         }
1256 
1257         error = init_threads(sdp, DO);
1258         if (error)
1259                 goto fail_per_node;
1260 
1261         if (!(sb->s_flags & MS_RDONLY)) {
1262                 error = gfs2_make_fs_rw(sdp);
1263                 if (error) {
1264                         fs_err(sdp, "can't make FS RW: %d\n", error);
1265                         goto fail_threads;
1266                 }
1267         }
1268 
1269         gfs2_glock_dq_uninit(&mount_gh);
1270         gfs2_online_uevent(sdp);
1271         return 0;
1272 
1273 fail_threads:
1274         init_threads(sdp, UNDO);
1275 fail_per_node:
1276         init_per_node(sdp, UNDO);
1277 fail_inodes:
1278         init_inodes(sdp, UNDO);
1279 fail_sb:
1280         if (sdp->sd_root_dir)
1281                 dput(sdp->sd_root_dir);
1282         if (sdp->sd_master_dir)
1283                 dput(sdp->sd_master_dir);
1284         if (sb->s_root)
1285                 dput(sb->s_root);
1286         sb->s_root = NULL;
1287 fail_locking:
1288         init_locking(sdp, &mount_gh, UNDO);
1289 fail_lm:
1290         gfs2_gl_hash_clear(sdp);
1291         gfs2_lm_unmount(sdp);
1292 fail_debug:
1293         gfs2_delete_debugfs_file(sdp);
1294         free_percpu(sdp->sd_lkstats);
1295         /* gfs2_sys_fs_del must be the last thing we do, since it causes
1296          * sysfs to call function gfs2_sbd_release, which frees sdp. */
1297         gfs2_sys_fs_del(sdp);
1298         sb->s_fs_info = NULL;
1299         return error;
1300 }
1301 
1302 static int set_gfs2_super(struct super_block *s, void *data)
1303 {
1304         s->s_bdev = data;
1305         s->s_dev = s->s_bdev->bd_dev;
1306 
1307         /*
1308          * We set the bdi here to the queue backing, file systems can
1309          * overwrite this in ->fill_super()
1310          */
1311         s->s_bdi = &bdev_get_queue(s->s_bdev)->backing_dev_info;
1312         return 0;
1313 }
1314 
1315 static int test_gfs2_super(struct super_block *s, void *ptr)
1316 {
1317         struct block_device *bdev = ptr;
1318         return (bdev == s->s_bdev);
1319 }
1320 
1321 /**
1322  * gfs2_mount - Get the GFS2 superblock
1323  * @fs_type: The GFS2 filesystem type
1324  * @flags: Mount flags
1325  * @dev_name: The name of the device
1326  * @data: The mount arguments
1327  *
1328  * Q. Why not use get_sb_bdev() ?
1329  * A. We need to select one of two root directories to mount, independent
1330  *    of whether this is the initial, or subsequent, mount of this sb
1331  *
1332  * Returns: 0 or -ve on error
1333  */
1334 
1335 static struct dentry *gfs2_mount(struct file_system_type *fs_type, int flags,
1336                        const char *dev_name, void *data)
1337 {
1338         struct block_device *bdev;
1339         struct super_block *s;
1340         fmode_t mode = FMODE_READ | FMODE_EXCL;
1341         int error;
1342         struct gfs2_args args;
1343         struct gfs2_sbd *sdp;
1344 
1345         if (!(flags & MS_RDONLY))
1346                 mode |= FMODE_WRITE;
1347 
1348         bdev = blkdev_get_by_path(dev_name, mode, fs_type);
1349         if (IS_ERR(bdev))
1350                 return ERR_CAST(bdev);
1351 
1352         /*
1353          * once the super is inserted into the list by sget, s_umount
1354          * will protect the lockfs code from trying to start a snapshot
1355          * while we are mounting
1356          */
1357         mutex_lock(&bdev->bd_fsfreeze_mutex);
1358         if (bdev->bd_fsfreeze_count > 0) {
1359                 mutex_unlock(&bdev->bd_fsfreeze_mutex);
1360                 error = -EBUSY;
1361                 goto error_bdev;
1362         }
1363         s = sget(fs_type, test_gfs2_super, set_gfs2_super, flags, bdev);
1364         mutex_unlock(&bdev->bd_fsfreeze_mutex);
1365         error = PTR_ERR(s);
1366         if (IS_ERR(s))
1367                 goto error_bdev;
1368 
1369         if (s->s_root) {
1370                 /*
1371                  * s_umount nests inside bd_mutex during
1372                  * __invalidate_device().  blkdev_put() acquires
1373                  * bd_mutex and can't be called under s_umount.  Drop
1374                  * s_umount temporarily.  This is safe as we're
1375                  * holding an active reference.
1376                  */
1377                 up_write(&s->s_umount);
1378                 blkdev_put(bdev, mode);
1379                 down_write(&s->s_umount);
1380         }
1381 
1382         memset(&args, 0, sizeof(args));
1383         args.ar_quota = GFS2_QUOTA_DEFAULT;
1384         args.ar_data = GFS2_DATA_DEFAULT;
1385         args.ar_commit = 30;
1386         args.ar_statfs_quantum = 30;
1387         args.ar_quota_quantum = 60;
1388         args.ar_errors = GFS2_ERRORS_DEFAULT;
1389 
1390         error = gfs2_mount_args(&args, data);
1391         if (error) {
1392                 printk(KERN_WARNING "GFS2: can't parse mount arguments\n");
1393                 goto error_super;
1394         }
1395 
1396         if (s->s_root) {
1397                 error = -EBUSY;
1398                 if ((flags ^ s->s_flags) & MS_RDONLY)
1399                         goto error_super;
1400         } else {
1401                 char b[BDEVNAME_SIZE];
1402 
1403                 s->s_mode = mode;
1404                 strlcpy(s->s_id, bdevname(bdev, b), sizeof(s->s_id));
1405                 sb_set_blocksize(s, block_size(bdev));
1406                 error = fill_super(s, &args, flags & MS_SILENT ? 1 : 0);
1407                 if (error)
1408                         goto error_super;
1409                 s->s_flags |= MS_ACTIVE;
1410                 bdev->bd_super = s;
1411         }
1412 
1413         sdp = s->s_fs_info;
1414         if (args.ar_meta)
1415                 return dget(sdp->sd_master_dir);
1416         else
1417                 return dget(sdp->sd_root_dir);
1418 
1419 error_super:
1420         deactivate_locked_super(s);
1421         return ERR_PTR(error);
1422 error_bdev:
1423         blkdev_put(bdev, mode);
1424         return ERR_PTR(error);
1425 }
1426 
1427 static int set_meta_super(struct super_block *s, void *ptr)
1428 {
1429         return -EINVAL;
1430 }
1431 
1432 static struct dentry *gfs2_mount_meta(struct file_system_type *fs_type,
1433                         int flags, const char *dev_name, void *data)
1434 {
1435         struct super_block *s;
1436         struct gfs2_sbd *sdp;
1437         struct path path;
1438         int error;
1439 
1440         error = kern_path(dev_name, LOOKUP_FOLLOW, &path);
1441         if (error) {
1442                 printk(KERN_WARNING "GFS2: path_lookup on %s returned error %d\n",
1443                        dev_name, error);
1444                 return ERR_PTR(error);
1445         }
1446         s = sget(&gfs2_fs_type, test_gfs2_super, set_meta_super, flags,
1447                  path.dentry->d_inode->i_sb->s_bdev);
1448         path_put(&path);
1449         if (IS_ERR(s)) {
1450                 printk(KERN_WARNING "GFS2: gfs2 mount does not exist\n");
1451                 return ERR_CAST(s);
1452         }
1453         if ((flags ^ s->s_flags) & MS_RDONLY) {
1454                 deactivate_locked_super(s);
1455                 return ERR_PTR(-EBUSY);
1456         }
1457         sdp = s->s_fs_info;
1458         return dget(sdp->sd_master_dir);
1459 }
1460 
1461 static void gfs2_kill_sb(struct super_block *sb)
1462 {
1463         struct gfs2_sbd *sdp = sb->s_fs_info;
1464 
1465         if (sdp == NULL) {
1466                 kill_block_super(sb);
1467                 return;
1468         }
1469 
1470         gfs2_meta_syncfs(sdp);
1471         dput(sdp->sd_root_dir);
1472         dput(sdp->sd_master_dir);
1473         sdp->sd_root_dir = NULL;
1474         sdp->sd_master_dir = NULL;
1475         shrink_dcache_sb(sb);
1476         gfs2_delete_debugfs_file(sdp);
1477         free_percpu(sdp->sd_lkstats);
1478         kill_block_super(sb);
1479 }
1480 
1481 struct file_system_type gfs2_fs_type = {
1482         .name = "gfs2",
1483         .fs_flags = FS_REQUIRES_DEV,
1484         .mount = gfs2_mount,
1485         .kill_sb = gfs2_kill_sb,
1486         .owner = THIS_MODULE,
1487 };
1488 MODULE_ALIAS_FS("gfs2");
1489 
1490 struct file_system_type gfs2meta_fs_type = {
1491         .name = "gfs2meta",
1492         .fs_flags = FS_REQUIRES_DEV,
1493         .mount = gfs2_mount_meta,
1494         .owner = THIS_MODULE,
1495 };
1496 MODULE_ALIAS_FS("gfs2meta");
1497 

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