blob: c88e66417330a03e803c2905ef11cf37568a137f [file] [log] [blame]
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001/*
2 * super.c - NILFS module and super block management.
3 *
4 * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation.
5 *
6 * This program is free software; you can redistribute it and/or modify
7 * it under the terms of the GNU General Public License as published by
8 * the Free Software Foundation; either version 2 of the License, or
9 * (at your option) any later version.
10 *
11 * This program is distributed in the hope that it will be useful,
12 * but WITHOUT ANY WARRANTY; without even the implied warranty of
13 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 * GNU General Public License for more details.
15 *
16 * You should have received a copy of the GNU General Public License
17 * along with this program; if not, write to the Free Software
18 * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
19 *
20 * Written by Ryusuke Konishi <ryusuke@osrg.net>
21 */
22/*
23 * linux/fs/ext2/super.c
24 *
25 * Copyright (C) 1992, 1993, 1994, 1995
26 * Remy Card (card@masi.ibp.fr)
27 * Laboratoire MASI - Institut Blaise Pascal
28 * Universite Pierre et Marie Curie (Paris VI)
29 *
30 * from
31 *
32 * linux/fs/minix/inode.c
33 *
34 * Copyright (C) 1991, 1992 Linus Torvalds
35 *
36 * Big-endian to little-endian byte-swapping/bitmaps by
37 * David S. Miller (davem@caip.rutgers.edu), 1995
38 */
39
40#include <linux/module.h>
41#include <linux/string.h>
42#include <linux/slab.h>
43#include <linux/init.h>
44#include <linux/blkdev.h>
45#include <linux/parser.h>
46#include <linux/random.h>
47#include <linux/crc32.h>
48#include <linux/smp_lock.h>
49#include <linux/vfs.h>
50#include <linux/writeback.h>
51#include <linux/kobject.h>
52#include <linux/exportfs.h>
Jiro SEKIBAb58a2852009-06-24 20:06:34 +090053#include <linux/seq_file.h>
54#include <linux/mount.h>
Ryusuke Konishi783f6182009-04-06 19:01:35 -070055#include "nilfs.h"
56#include "mdt.h"
57#include "alloc.h"
58#include "page.h"
59#include "cpfile.h"
60#include "ifile.h"
61#include "dat.h"
62#include "segment.h"
63#include "segbuf.h"
64
65MODULE_AUTHOR("NTT Corp.");
66MODULE_DESCRIPTION("A New Implementation of the Log-structured Filesystem "
67 "(NILFS)");
Ryusuke Konishi783f6182009-04-06 19:01:35 -070068MODULE_LICENSE("GPL");
69
Li Hong41c88bd2010-04-06 00:54:11 +080070struct kmem_cache *nilfs_inode_cachep;
71struct kmem_cache *nilfs_transaction_cachep;
72struct kmem_cache *nilfs_segbuf_cachep;
73struct kmem_cache *nilfs_btree_path_cache;
74
Ryusuke Konishi783f6182009-04-06 19:01:35 -070075static int nilfs_remount(struct super_block *sb, int *flags, char *data);
Ryusuke Konishi783f6182009-04-06 19:01:35 -070076
77/**
78 * nilfs_error() - report failure condition on a filesystem
79 *
80 * nilfs_error() sets an ERROR_FS flag on the superblock as well as
81 * reporting an error message. It should be called when NILFS detects
82 * incoherences or defects of meta data on disk. As for sustainable
83 * errors such as a single-shot I/O error, nilfs_warning() or the printk()
84 * function should be used instead.
85 *
86 * The segment constructor must not call this function because it can
87 * kill itself.
88 */
89void nilfs_error(struct super_block *sb, const char *function,
90 const char *fmt, ...)
91{
92 struct nilfs_sb_info *sbi = NILFS_SB(sb);
93 va_list args;
94
95 va_start(args, fmt);
96 printk(KERN_CRIT "NILFS error (device %s): %s: ", sb->s_id, function);
97 vprintk(fmt, args);
98 printk("\n");
99 va_end(args);
100
101 if (!(sb->s_flags & MS_RDONLY)) {
102 struct the_nilfs *nilfs = sbi->s_nilfs;
103
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700104 down_write(&nilfs->ns_sem);
105 if (!(nilfs->ns_mount_state & NILFS_ERROR_FS)) {
106 nilfs->ns_mount_state |= NILFS_ERROR_FS;
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700107 nilfs->ns_sbp[0]->s_state |=
108 cpu_to_le16(NILFS_ERROR_FS);
109 nilfs_commit_super(sbi, 1);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700110 }
111 up_write(&nilfs->ns_sem);
112
113 if (nilfs_test_opt(sbi, ERRORS_RO)) {
114 printk(KERN_CRIT "Remounting filesystem read-only\n");
115 sb->s_flags |= MS_RDONLY;
116 }
117 }
118
119 if (nilfs_test_opt(sbi, ERRORS_PANIC))
120 panic("NILFS (device %s): panic forced after error\n",
121 sb->s_id);
122}
123
124void nilfs_warning(struct super_block *sb, const char *function,
125 const char *fmt, ...)
126{
127 va_list args;
128
129 va_start(args, fmt);
130 printk(KERN_WARNING "NILFS warning (device %s): %s: ",
131 sb->s_id, function);
132 vprintk(fmt, args);
133 printk("\n");
134 va_end(args);
135}
136
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700137
Ryusuke Konishia53b4752009-05-27 22:11:46 +0900138struct inode *nilfs_alloc_inode_common(struct the_nilfs *nilfs)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700139{
140 struct nilfs_inode_info *ii;
141
142 ii = kmem_cache_alloc(nilfs_inode_cachep, GFP_NOFS);
143 if (!ii)
144 return NULL;
145 ii->i_bh = NULL;
146 ii->i_state = 0;
147 ii->vfs_inode.i_version = 1;
Ryusuke Konishia53b4752009-05-27 22:11:46 +0900148 nilfs_btnode_cache_init(&ii->i_btnode_cache, nilfs->ns_bdi);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700149 return &ii->vfs_inode;
150}
151
Ryusuke Konishia53b4752009-05-27 22:11:46 +0900152struct inode *nilfs_alloc_inode(struct super_block *sb)
153{
154 return nilfs_alloc_inode_common(NILFS_SB(sb)->s_nilfs);
155}
156
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700157void nilfs_destroy_inode(struct inode *inode)
158{
159 kmem_cache_free(nilfs_inode_cachep, NILFS_I(inode));
160}
161
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700162static void nilfs_clear_inode(struct inode *inode)
163{
164 struct nilfs_inode_info *ii = NILFS_I(inode);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700165
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700166 /*
167 * Free resources allocated in nilfs_read_inode(), here.
168 */
Ryusuke Konishia2e7d2d2009-04-06 19:01:44 -0700169 BUG_ON(!list_empty(&ii->i_dirty));
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700170 brelse(ii->i_bh);
171 ii->i_bh = NULL;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700172
173 if (test_bit(NILFS_I_BMAP, &ii->i_state))
174 nilfs_bmap_clear(ii->i_bmap);
175
176 nilfs_btnode_cache_clear(&ii->i_btnode_cache);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700177}
178
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700179static int nilfs_sync_super(struct nilfs_sb_info *sbi, int dupsb)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700180{
181 struct the_nilfs *nilfs = sbi->s_nilfs;
182 int err;
183 int barrier_done = 0;
184
185 if (nilfs_test_opt(sbi, BARRIER)) {
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700186 set_buffer_ordered(nilfs->ns_sbh[0]);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700187 barrier_done = 1;
188 }
189 retry:
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700190 set_buffer_dirty(nilfs->ns_sbh[0]);
191 err = sync_dirty_buffer(nilfs->ns_sbh[0]);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700192 if (err == -EOPNOTSUPP && barrier_done) {
193 nilfs_warning(sbi->s_super, __func__,
194 "barrier-based sync failed. "
195 "disabling barriers\n");
196 nilfs_clear_opt(sbi, BARRIER);
197 barrier_done = 0;
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700198 clear_buffer_ordered(nilfs->ns_sbh[0]);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700199 goto retry;
200 }
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700201 if (unlikely(err)) {
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700202 printk(KERN_ERR
203 "NILFS: unable to write superblock (err=%d)\n", err);
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700204 if (err == -EIO && nilfs->ns_sbh[1]) {
205 nilfs_fall_back_super_block(nilfs);
206 goto retry;
207 }
208 } else {
209 struct nilfs_super_block *sbp = nilfs->ns_sbp[0];
210
211 /*
212 * The latest segment becomes trailable from the position
213 * written in superblock.
214 */
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700215 clear_nilfs_discontinued(nilfs);
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700216
217 /* update GC protection for recent segments */
218 if (nilfs->ns_sbh[1]) {
219 sbp = NULL;
220 if (dupsb) {
221 set_buffer_dirty(nilfs->ns_sbh[1]);
222 if (!sync_dirty_buffer(nilfs->ns_sbh[1]))
223 sbp = nilfs->ns_sbp[1];
224 }
225 }
226 if (sbp) {
227 spin_lock(&nilfs->ns_last_segment_lock);
228 nilfs->ns_prot_seq = le64_to_cpu(sbp->s_last_seq);
229 spin_unlock(&nilfs->ns_last_segment_lock);
230 }
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700231 }
232
233 return err;
234}
235
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700236int nilfs_commit_super(struct nilfs_sb_info *sbi, int dupsb)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700237{
238 struct the_nilfs *nilfs = sbi->s_nilfs;
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700239 struct nilfs_super_block **sbp = nilfs->ns_sbp;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700240 sector_t nfreeblocks;
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700241 time_t t;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700242 int err;
243
244 /* nilfs->sem must be locked by the caller. */
Ryusuke Konishi34cb9b52010-05-01 10:07:07 +0900245 if (sbp[0]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) {
246 if (sbp[1] && sbp[1]->s_magic == cpu_to_le16(NILFS_SUPER_MAGIC))
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700247 nilfs_swap_super_block(nilfs);
248 else {
249 printk(KERN_CRIT "NILFS: superblock broke on dev %s\n",
250 sbi->s_super->s_id);
251 return -EIO;
252 }
253 }
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700254 err = nilfs_count_free_blocks(nilfs, &nfreeblocks);
255 if (unlikely(err)) {
256 printk(KERN_ERR "NILFS: failed to count free blocks\n");
257 return err;
258 }
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700259 spin_lock(&nilfs->ns_last_segment_lock);
260 sbp[0]->s_last_seq = cpu_to_le64(nilfs->ns_last_seq);
261 sbp[0]->s_last_pseg = cpu_to_le64(nilfs->ns_last_pseg);
262 sbp[0]->s_last_cno = cpu_to_le64(nilfs->ns_last_cno);
263 spin_unlock(&nilfs->ns_last_segment_lock);
264
265 t = get_seconds();
266 nilfs->ns_sbwtime[0] = t;
267 sbp[0]->s_free_blocks_count = cpu_to_le64(nfreeblocks);
268 sbp[0]->s_wtime = cpu_to_le64(t);
269 sbp[0]->s_sum = 0;
270 sbp[0]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed,
271 (unsigned char *)sbp[0],
272 nilfs->ns_sbsize));
273 if (dupsb && sbp[1]) {
274 memcpy(sbp[1], sbp[0], nilfs->ns_sbsize);
275 nilfs->ns_sbwtime[1] = t;
276 }
Ryusuke Konishie605f0a2009-12-09 00:57:52 +0900277 clear_nilfs_sb_dirty(nilfs);
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700278 return nilfs_sync_super(sbi, dupsb);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700279}
280
281static void nilfs_put_super(struct super_block *sb)
282{
283 struct nilfs_sb_info *sbi = NILFS_SB(sb);
284 struct the_nilfs *nilfs = sbi->s_nilfs;
285
Christoph Hellwig6cfd0142009-05-05 15:40:36 +0200286 lock_kernel();
287
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700288 nilfs_detach_segment_constructor(sbi);
289
290 if (!(sb->s_flags & MS_RDONLY)) {
291 down_write(&nilfs->ns_sem);
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700292 nilfs->ns_sbp[0]->s_state = cpu_to_le16(nilfs->ns_mount_state);
293 nilfs_commit_super(sbi, 1);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700294 up_write(&nilfs->ns_sem);
295 }
Ryusuke Konishie59399d2009-06-08 01:39:32 +0900296 down_write(&nilfs->ns_super_sem);
Ryusuke Konishi3f82ff52009-06-08 01:39:30 +0900297 if (nilfs->ns_current == sbi)
298 nilfs->ns_current = NULL;
Ryusuke Konishie59399d2009-06-08 01:39:32 +0900299 up_write(&nilfs->ns_super_sem);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700300
301 nilfs_detach_checkpoint(sbi);
302 put_nilfs(sbi->s_nilfs);
303 sbi->s_super = NULL;
304 sb->s_fs_info = NULL;
Ryusuke Konishi6dd47402009-06-08 01:39:31 +0900305 nilfs_put_sbinfo(sbi);
Christoph Hellwig6cfd0142009-05-05 15:40:36 +0200306
307 unlock_kernel();
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700308}
309
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700310static int nilfs_sync_fs(struct super_block *sb, int wait)
311{
Jiro SEKIBA6233caa2009-07-23 01:26:33 +0900312 struct nilfs_sb_info *sbi = NILFS_SB(sb);
313 struct the_nilfs *nilfs = sbi->s_nilfs;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700314 int err = 0;
315
316 /* This function is called when super block should be written back */
317 if (wait)
318 err = nilfs_construct_segment(sb);
Jiro SEKIBA6233caa2009-07-23 01:26:33 +0900319
320 down_write(&nilfs->ns_sem);
Ryusuke Konishie605f0a2009-12-09 00:57:52 +0900321 if (nilfs_sb_dirty(nilfs))
Jiro SEKIBA6233caa2009-07-23 01:26:33 +0900322 nilfs_commit_super(sbi, 1);
323 up_write(&nilfs->ns_sem);
324
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700325 return err;
326}
327
328int nilfs_attach_checkpoint(struct nilfs_sb_info *sbi, __u64 cno)
329{
330 struct the_nilfs *nilfs = sbi->s_nilfs;
331 struct nilfs_checkpoint *raw_cp;
332 struct buffer_head *bh_cp;
333 int err;
334
Ryusuke Konishie59399d2009-06-08 01:39:32 +0900335 down_write(&nilfs->ns_super_sem);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700336 list_add(&sbi->s_list, &nilfs->ns_supers);
Ryusuke Konishie59399d2009-06-08 01:39:32 +0900337 up_write(&nilfs->ns_super_sem);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700338
Ryusuke Konishi79739562009-11-12 23:56:43 +0900339 sbi->s_ifile = nilfs_ifile_new(sbi, nilfs->ns_inode_size);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700340 if (!sbi->s_ifile)
341 return -ENOMEM;
342
Zhang Qiang1154ecb2009-08-18 14:58:24 +0800343 down_read(&nilfs->ns_segctor_sem);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700344 err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, cno, 0, &raw_cp,
345 &bh_cp);
Zhang Qiang1154ecb2009-08-18 14:58:24 +0800346 up_read(&nilfs->ns_segctor_sem);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700347 if (unlikely(err)) {
348 if (err == -ENOENT || err == -EINVAL) {
349 printk(KERN_ERR
350 "NILFS: Invalid checkpoint "
351 "(checkpoint number=%llu)\n",
352 (unsigned long long)cno);
353 err = -EINVAL;
354 }
355 goto failed;
356 }
357 err = nilfs_read_inode_common(sbi->s_ifile, &raw_cp->cp_ifile_inode);
358 if (unlikely(err))
359 goto failed_bh;
360 atomic_set(&sbi->s_inodes_count, le64_to_cpu(raw_cp->cp_inodes_count));
361 atomic_set(&sbi->s_blocks_count, le64_to_cpu(raw_cp->cp_blocks_count));
362
363 nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp);
364 return 0;
365
366 failed_bh:
367 nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp);
368 failed:
369 nilfs_mdt_destroy(sbi->s_ifile);
370 sbi->s_ifile = NULL;
371
Ryusuke Konishie59399d2009-06-08 01:39:32 +0900372 down_write(&nilfs->ns_super_sem);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700373 list_del_init(&sbi->s_list);
Ryusuke Konishie59399d2009-06-08 01:39:32 +0900374 up_write(&nilfs->ns_super_sem);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700375
376 return err;
377}
378
379void nilfs_detach_checkpoint(struct nilfs_sb_info *sbi)
380{
381 struct the_nilfs *nilfs = sbi->s_nilfs;
382
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700383 nilfs_mdt_destroy(sbi->s_ifile);
384 sbi->s_ifile = NULL;
Ryusuke Konishie59399d2009-06-08 01:39:32 +0900385 down_write(&nilfs->ns_super_sem);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700386 list_del_init(&sbi->s_list);
Ryusuke Konishie59399d2009-06-08 01:39:32 +0900387 up_write(&nilfs->ns_super_sem);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700388}
389
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700390static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf)
391{
392 struct super_block *sb = dentry->d_sb;
393 struct nilfs_sb_info *sbi = NILFS_SB(sb);
Ryusuke Konishic306af22009-03-26 10:16:57 +0900394 struct the_nilfs *nilfs = sbi->s_nilfs;
395 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700396 unsigned long long blocks;
397 unsigned long overhead;
398 unsigned long nrsvblocks;
399 sector_t nfreeblocks;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700400 int err;
401
402 /*
403 * Compute all of the segment blocks
404 *
405 * The blocks before first segment and after last segment
406 * are excluded.
407 */
408 blocks = nilfs->ns_blocks_per_segment * nilfs->ns_nsegments
409 - nilfs->ns_first_data_block;
410 nrsvblocks = nilfs->ns_nrsvsegs * nilfs->ns_blocks_per_segment;
411
412 /*
413 * Compute the overhead
414 *
Ryusuke Konishi7a650042010-03-14 03:32:40 +0900415 * When distributing meta data blocks outside segment structure,
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700416 * We must count them as the overhead.
417 */
418 overhead = 0;
419
420 err = nilfs_count_free_blocks(nilfs, &nfreeblocks);
421 if (unlikely(err))
422 return err;
423
424 buf->f_type = NILFS_SUPER_MAGIC;
425 buf->f_bsize = sb->s_blocksize;
426 buf->f_blocks = blocks - overhead;
427 buf->f_bfree = nfreeblocks;
428 buf->f_bavail = (buf->f_bfree >= nrsvblocks) ?
429 (buf->f_bfree - nrsvblocks) : 0;
430 buf->f_files = atomic_read(&sbi->s_inodes_count);
431 buf->f_ffree = 0; /* nilfs_count_free_inodes(sb); */
432 buf->f_namelen = NILFS_NAME_LEN;
Ryusuke Konishic306af22009-03-26 10:16:57 +0900433 buf->f_fsid.val[0] = (u32)id;
434 buf->f_fsid.val[1] = (u32)(id >> 32);
435
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700436 return 0;
437}
438
Jiro SEKIBAb58a2852009-06-24 20:06:34 +0900439static int nilfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
440{
441 struct super_block *sb = vfs->mnt_sb;
442 struct nilfs_sb_info *sbi = NILFS_SB(sb);
443
444 if (!nilfs_test_opt(sbi, BARRIER))
Jiro SEKIBA91f19532009-11-12 14:07:26 +0900445 seq_printf(seq, ",nobarrier");
Jiro SEKIBAb58a2852009-06-24 20:06:34 +0900446 if (nilfs_test_opt(sbi, SNAPSHOT))
447 seq_printf(seq, ",cp=%llu",
448 (unsigned long long int)sbi->s_snapshot_cno);
Jiro SEKIBAb58a2852009-06-24 20:06:34 +0900449 if (nilfs_test_opt(sbi, ERRORS_PANIC))
450 seq_printf(seq, ",errors=panic");
Ryusuke Konishi277a6a32010-04-02 18:02:33 +0900451 if (nilfs_test_opt(sbi, ERRORS_CONT))
452 seq_printf(seq, ",errors=continue");
Jiro SEKIBAb58a2852009-06-24 20:06:34 +0900453 if (nilfs_test_opt(sbi, STRICT_ORDER))
454 seq_printf(seq, ",order=strict");
Ryusuke Konishi02345762009-11-20 03:28:01 +0900455 if (nilfs_test_opt(sbi, NORECOVERY))
456 seq_printf(seq, ",norecovery");
Jiro SEKIBAe902ec92010-01-30 18:06:35 +0900457 if (nilfs_test_opt(sbi, DISCARD))
458 seq_printf(seq, ",discard");
Jiro SEKIBAb58a2852009-06-24 20:06:34 +0900459
460 return 0;
461}
462
Alexey Dobriyanb87221d2009-09-21 17:01:09 -0700463static const struct super_operations nilfs_sops = {
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700464 .alloc_inode = nilfs_alloc_inode,
465 .destroy_inode = nilfs_destroy_inode,
466 .dirty_inode = nilfs_dirty_inode,
467 /* .write_inode = nilfs_write_inode, */
468 /* .put_inode = nilfs_put_inode, */
469 /* .drop_inode = nilfs_drop_inode, */
470 .delete_inode = nilfs_delete_inode,
471 .put_super = nilfs_put_super,
Jiro SEKIBA1dfa2712009-07-23 01:33:49 +0900472 /* .write_super = nilfs_write_super, */
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700473 .sync_fs = nilfs_sync_fs,
474 /* .write_super_lockfs */
475 /* .unlockfs */
476 .statfs = nilfs_statfs,
477 .remount_fs = nilfs_remount,
478 .clear_inode = nilfs_clear_inode,
479 /* .umount_begin */
Jiro SEKIBAb58a2852009-06-24 20:06:34 +0900480 .show_options = nilfs_show_options
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700481};
482
483static struct inode *
484nilfs_nfs_get_inode(struct super_block *sb, u64 ino, u32 generation)
485{
486 struct inode *inode;
487
488 if (ino < NILFS_FIRST_INO(sb) && ino != NILFS_ROOT_INO &&
489 ino != NILFS_SKETCH_INO)
490 return ERR_PTR(-ESTALE);
491
492 inode = nilfs_iget(sb, ino);
493 if (IS_ERR(inode))
494 return ERR_CAST(inode);
495 if (generation && inode->i_generation != generation) {
496 iput(inode);
497 return ERR_PTR(-ESTALE);
498 }
499
500 return inode;
501}
502
503static struct dentry *
504nilfs_fh_to_dentry(struct super_block *sb, struct fid *fid, int fh_len,
505 int fh_type)
506{
507 return generic_fh_to_dentry(sb, fid, fh_len, fh_type,
508 nilfs_nfs_get_inode);
509}
510
511static struct dentry *
512nilfs_fh_to_parent(struct super_block *sb, struct fid *fid, int fh_len,
513 int fh_type)
514{
515 return generic_fh_to_parent(sb, fid, fh_len, fh_type,
516 nilfs_nfs_get_inode);
517}
518
Alexey Dobriyanac4cfdd2009-09-21 17:01:10 -0700519static const struct export_operations nilfs_export_ops = {
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700520 .fh_to_dentry = nilfs_fh_to_dentry,
521 .fh_to_parent = nilfs_fh_to_parent,
522 .get_parent = nilfs_get_parent,
523};
524
525enum {
526 Opt_err_cont, Opt_err_panic, Opt_err_ro,
Ryusuke Konishi02345762009-11-20 03:28:01 +0900527 Opt_nobarrier, Opt_snapshot, Opt_order, Opt_norecovery,
Jiro SEKIBAe902ec92010-01-30 18:06:35 +0900528 Opt_discard, Opt_err,
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700529};
530
531static match_table_t tokens = {
532 {Opt_err_cont, "errors=continue"},
533 {Opt_err_panic, "errors=panic"},
534 {Opt_err_ro, "errors=remount-ro"},
Jiro SEKIBA91f19532009-11-12 14:07:26 +0900535 {Opt_nobarrier, "nobarrier"},
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700536 {Opt_snapshot, "cp=%u"},
537 {Opt_order, "order=%s"},
Ryusuke Konishi02345762009-11-20 03:28:01 +0900538 {Opt_norecovery, "norecovery"},
Jiro SEKIBAe902ec92010-01-30 18:06:35 +0900539 {Opt_discard, "discard"},
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700540 {Opt_err, NULL}
541};
542
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700543static int parse_options(char *options, struct super_block *sb)
544{
545 struct nilfs_sb_info *sbi = NILFS_SB(sb);
546 char *p;
547 substring_t args[MAX_OPT_ARGS];
548 int option;
549
550 if (!options)
551 return 1;
552
553 while ((p = strsep(&options, ",")) != NULL) {
554 int token;
555 if (!*p)
556 continue;
557
558 token = match_token(p, tokens, args);
559 switch (token) {
Jiro SEKIBA91f19532009-11-12 14:07:26 +0900560 case Opt_nobarrier:
561 nilfs_clear_opt(sbi, BARRIER);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700562 break;
563 case Opt_order:
564 if (strcmp(args[0].from, "relaxed") == 0)
565 /* Ordered data semantics */
566 nilfs_clear_opt(sbi, STRICT_ORDER);
567 else if (strcmp(args[0].from, "strict") == 0)
568 /* Strict in-order semantics */
569 nilfs_set_opt(sbi, STRICT_ORDER);
570 else
571 return 0;
572 break;
573 case Opt_err_panic:
574 nilfs_write_opt(sbi, ERROR_MODE, ERRORS_PANIC);
575 break;
576 case Opt_err_ro:
577 nilfs_write_opt(sbi, ERROR_MODE, ERRORS_RO);
578 break;
579 case Opt_err_cont:
580 nilfs_write_opt(sbi, ERROR_MODE, ERRORS_CONT);
581 break;
582 case Opt_snapshot:
583 if (match_int(&args[0], &option) || option <= 0)
584 return 0;
585 if (!(sb->s_flags & MS_RDONLY))
586 return 0;
587 sbi->s_snapshot_cno = option;
588 nilfs_set_opt(sbi, SNAPSHOT);
589 break;
Ryusuke Konishi02345762009-11-20 03:28:01 +0900590 case Opt_norecovery:
591 nilfs_set_opt(sbi, NORECOVERY);
592 break;
Jiro SEKIBAe902ec92010-01-30 18:06:35 +0900593 case Opt_discard:
594 nilfs_set_opt(sbi, DISCARD);
595 break;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700596 default:
597 printk(KERN_ERR
598 "NILFS: Unrecognized mount option \"%s\"\n", p);
599 return 0;
600 }
601 }
602 return 1;
603}
604
605static inline void
606nilfs_set_default_options(struct nilfs_sb_info *sbi,
607 struct nilfs_super_block *sbp)
608{
609 sbi->s_mount_opt =
Ryusuke Konishi277a6a32010-04-02 18:02:33 +0900610 NILFS_MOUNT_ERRORS_RO | NILFS_MOUNT_BARRIER;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700611}
612
613static int nilfs_setup_super(struct nilfs_sb_info *sbi)
614{
615 struct the_nilfs *nilfs = sbi->s_nilfs;
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700616 struct nilfs_super_block *sbp = nilfs->ns_sbp[0];
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700617 int max_mnt_count = le16_to_cpu(sbp->s_max_mnt_count);
618 int mnt_count = le16_to_cpu(sbp->s_mnt_count);
619
620 /* nilfs->sem must be locked by the caller. */
Ryusuke Konishif50a4c82009-11-19 16:58:40 +0900621 if (nilfs->ns_mount_state & NILFS_ERROR_FS) {
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700622 printk(KERN_WARNING
623 "NILFS warning: mounting fs with errors\n");
624#if 0
625 } else if (max_mnt_count >= 0 && mnt_count >= max_mnt_count) {
626 printk(KERN_WARNING
627 "NILFS warning: maximal mount count reached\n");
628#endif
629 }
630 if (!max_mnt_count)
631 sbp->s_max_mnt_count = cpu_to_le16(NILFS_DFL_MAX_MNT_COUNT);
632
633 sbp->s_mnt_count = cpu_to_le16(mnt_count + 1);
634 sbp->s_state = cpu_to_le16(le16_to_cpu(sbp->s_state) & ~NILFS_VALID_FS);
635 sbp->s_mtime = cpu_to_le64(get_seconds());
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700636 return nilfs_commit_super(sbi, 1);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700637}
638
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700639struct nilfs_super_block *nilfs_read_super_block(struct super_block *sb,
640 u64 pos, int blocksize,
641 struct buffer_head **pbh)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700642{
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700643 unsigned long long sb_index = pos;
644 unsigned long offset;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700645
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700646 offset = do_div(sb_index, blocksize);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700647 *pbh = sb_bread(sb, sb_index);
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700648 if (!*pbh)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700649 return NULL;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700650 return (struct nilfs_super_block *)((char *)(*pbh)->b_data + offset);
651}
652
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700653int nilfs_store_magic_and_option(struct super_block *sb,
654 struct nilfs_super_block *sbp,
655 char *data)
656{
657 struct nilfs_sb_info *sbi = NILFS_SB(sb);
658
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700659 sb->s_magic = le16_to_cpu(sbp->s_magic);
660
661 /* FS independent flags */
662#ifdef NILFS_ATIME_DISABLE
663 sb->s_flags |= MS_NOATIME;
664#endif
665
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700666 nilfs_set_default_options(sbi, sbp);
667
668 sbi->s_resuid = le16_to_cpu(sbp->s_def_resuid);
669 sbi->s_resgid = le16_to_cpu(sbp->s_def_resgid);
670 sbi->s_interval = le32_to_cpu(sbp->s_c_interval);
671 sbi->s_watermark = le32_to_cpu(sbp->s_c_block_max);
672
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700673 return !parse_options(data, sb) ? -EINVAL : 0 ;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700674}
675
676/**
677 * nilfs_fill_super() - initialize a super block instance
678 * @sb: super_block
679 * @data: mount options
680 * @silent: silent mode flag
681 * @nilfs: the_nilfs struct
682 *
Ryusuke Konishiaa7dfb82009-06-08 01:39:33 +0900683 * This function is called exclusively by nilfs->ns_mount_mutex.
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700684 * So, the recovery process is protected from other simultaneous mounts.
685 */
686static int
687nilfs_fill_super(struct super_block *sb, void *data, int silent,
688 struct the_nilfs *nilfs)
689{
690 struct nilfs_sb_info *sbi;
691 struct inode *root;
692 __u64 cno;
693 int err;
694
695 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
696 if (!sbi)
697 return -ENOMEM;
698
699 sb->s_fs_info = sbi;
700
701 get_nilfs(nilfs);
702 sbi->s_nilfs = nilfs;
703 sbi->s_super = sb;
Ryusuke Konishi6dd47402009-06-08 01:39:31 +0900704 atomic_set(&sbi->s_count, 1);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700705
706 err = init_nilfs(nilfs, sbi, (char *)data);
707 if (err)
708 goto failed_sbi;
709
710 spin_lock_init(&sbi->s_inode_lock);
711 INIT_LIST_HEAD(&sbi->s_dirty_files);
712 INIT_LIST_HEAD(&sbi->s_list);
713
714 /*
715 * Following initialization is overlapped because
716 * nilfs_sb_info structure has been cleared at the beginning.
717 * But we reserve them to keep our interest and make ready
718 * for the future change.
719 */
720 get_random_bytes(&sbi->s_next_generation,
721 sizeof(sbi->s_next_generation));
722 spin_lock_init(&sbi->s_next_gen_lock);
723
724 sb->s_op = &nilfs_sops;
725 sb->s_export_op = &nilfs_export_ops;
726 sb->s_root = NULL;
Ryusuke Konishi61239232009-04-06 19:02:00 -0700727 sb->s_time_gran = 1;
Ryusuke Konishi973bec32010-05-03 21:00:48 +0900728 sb->s_bdi = nilfs->ns_bdi;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700729
Ryusuke Konishif50a4c82009-11-19 16:58:40 +0900730 err = load_nilfs(nilfs, sbi);
731 if (err)
732 goto failed_sbi;
733
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700734 cno = nilfs_last_cno(nilfs);
735
736 if (sb->s_flags & MS_RDONLY) {
737 if (nilfs_test_opt(sbi, SNAPSHOT)) {
Zhu Yanhai43be0ec2009-08-12 14:17:59 +0800738 down_read(&nilfs->ns_segctor_sem);
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700739 err = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile,
740 sbi->s_snapshot_cno);
Zhu Yanhai43be0ec2009-08-12 14:17:59 +0800741 up_read(&nilfs->ns_segctor_sem);
742 if (err < 0) {
743 if (err == -ENOENT)
744 err = -EINVAL;
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700745 goto failed_sbi;
Zhu Yanhai43be0ec2009-08-12 14:17:59 +0800746 }
Ryusuke Konishi1f5abe72009-04-06 19:01:55 -0700747 if (!err) {
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700748 printk(KERN_ERR
749 "NILFS: The specified checkpoint is "
750 "not a snapshot "
751 "(checkpoint number=%llu).\n",
752 (unsigned long long)sbi->s_snapshot_cno);
753 err = -EINVAL;
754 goto failed_sbi;
755 }
756 cno = sbi->s_snapshot_cno;
757 } else
758 /* Read-only mount */
759 sbi->s_snapshot_cno = cno;
760 }
761
762 err = nilfs_attach_checkpoint(sbi, cno);
763 if (err) {
764 printk(KERN_ERR "NILFS: error loading a checkpoint"
765 " (checkpoint number=%llu).\n", (unsigned long long)cno);
766 goto failed_sbi;
767 }
768
769 if (!(sb->s_flags & MS_RDONLY)) {
Ryusuke Konishicece5522009-04-06 19:01:58 -0700770 err = nilfs_attach_segment_constructor(sbi);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700771 if (err)
772 goto failed_checkpoint;
773 }
774
775 root = nilfs_iget(sb, NILFS_ROOT_INO);
776 if (IS_ERR(root)) {
777 printk(KERN_ERR "NILFS: get root inode failed\n");
778 err = PTR_ERR(root);
779 goto failed_segctor;
780 }
781 if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) {
782 iput(root);
783 printk(KERN_ERR "NILFS: corrupt root inode.\n");
784 err = -EINVAL;
785 goto failed_segctor;
786 }
787 sb->s_root = d_alloc_root(root);
788 if (!sb->s_root) {
789 iput(root);
790 printk(KERN_ERR "NILFS: get root dentry failed\n");
791 err = -ENOMEM;
792 goto failed_segctor;
793 }
794
795 if (!(sb->s_flags & MS_RDONLY)) {
796 down_write(&nilfs->ns_sem);
797 nilfs_setup_super(sbi);
798 up_write(&nilfs->ns_sem);
799 }
800
Ryusuke Konishie59399d2009-06-08 01:39:32 +0900801 down_write(&nilfs->ns_super_sem);
Ryusuke Konishi3f82ff52009-06-08 01:39:30 +0900802 if (!nilfs_test_opt(sbi, SNAPSHOT))
803 nilfs->ns_current = sbi;
Ryusuke Konishie59399d2009-06-08 01:39:32 +0900804 up_write(&nilfs->ns_super_sem);
Ryusuke Konishi3f82ff52009-06-08 01:39:30 +0900805
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700806 return 0;
807
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700808 failed_segctor:
809 nilfs_detach_segment_constructor(sbi);
810
811 failed_checkpoint:
812 nilfs_detach_checkpoint(sbi);
813
814 failed_sbi:
815 put_nilfs(nilfs);
816 sb->s_fs_info = NULL;
Ryusuke Konishi6dd47402009-06-08 01:39:31 +0900817 nilfs_put_sbinfo(sbi);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700818 return err;
819}
820
821static int nilfs_remount(struct super_block *sb, int *flags, char *data)
822{
823 struct nilfs_sb_info *sbi = NILFS_SB(sb);
824 struct nilfs_super_block *sbp;
825 struct the_nilfs *nilfs = sbi->s_nilfs;
826 unsigned long old_sb_flags;
827 struct nilfs_mount_options old_opts;
828 int err;
829
Alessio Igor Bogani337eb002009-05-12 15:10:54 +0200830 lock_kernel();
831
Ryusuke Konishie59399d2009-06-08 01:39:32 +0900832 down_write(&nilfs->ns_super_sem);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700833 old_sb_flags = sb->s_flags;
834 old_opts.mount_opt = sbi->s_mount_opt;
835 old_opts.snapshot_cno = sbi->s_snapshot_cno;
836
837 if (!parse_options(data, sb)) {
838 err = -EINVAL;
839 goto restore_opts;
840 }
841 sb->s_flags = (sb->s_flags & ~MS_POSIXACL);
842
843 if ((*flags & MS_RDONLY) &&
844 sbi->s_snapshot_cno != old_opts.snapshot_cno) {
845 printk(KERN_WARNING "NILFS (device %s): couldn't "
Ryusuke Konishic91cea12010-03-14 04:01:27 +0900846 "remount to a different snapshot.\n",
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700847 sb->s_id);
848 err = -EINVAL;
849 goto restore_opts;
850 }
851
Ryusuke Konishi02345762009-11-20 03:28:01 +0900852 if (!nilfs_valid_fs(nilfs)) {
853 printk(KERN_WARNING "NILFS (device %s): couldn't "
854 "remount because the filesystem is in an "
855 "incomplete recovery state.\n", sb->s_id);
856 err = -EINVAL;
857 goto restore_opts;
858 }
859
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700860 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
861 goto out;
862 if (*flags & MS_RDONLY) {
863 /* Shutting down the segment constructor */
864 nilfs_detach_segment_constructor(sbi);
865 sb->s_flags |= MS_RDONLY;
866
867 sbi->s_snapshot_cno = nilfs_last_cno(nilfs);
868 /* nilfs_set_opt(sbi, SNAPSHOT); */
869
870 /*
871 * Remounting a valid RW partition RDONLY, so set
872 * the RDONLY flag and then mark the partition as valid again.
873 */
874 down_write(&nilfs->ns_sem);
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700875 sbp = nilfs->ns_sbp[0];
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700876 if (!(sbp->s_state & le16_to_cpu(NILFS_VALID_FS)) &&
877 (nilfs->ns_mount_state & NILFS_VALID_FS))
878 sbp->s_state = cpu_to_le16(nilfs->ns_mount_state);
879 sbp->s_mtime = cpu_to_le64(get_seconds());
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700880 nilfs_commit_super(sbi, 1);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700881 up_write(&nilfs->ns_sem);
882 } else {
883 /*
884 * Mounting a RDONLY partition read-write, so reread and
885 * store the current valid flag. (It may have been changed
886 * by fsck since we originally mounted the partition.)
887 */
Ryusuke Konishi3f82ff52009-06-08 01:39:30 +0900888 if (nilfs->ns_current && nilfs->ns_current != sbi) {
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700889 printk(KERN_WARNING "NILFS (device %s): couldn't "
Ryusuke Konishi3f82ff52009-06-08 01:39:30 +0900890 "remount because an RW-mount exists.\n",
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700891 sb->s_id);
892 err = -EBUSY;
Ryusuke Konishie59399d2009-06-08 01:39:32 +0900893 goto restore_opts;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700894 }
895 if (sbi->s_snapshot_cno != nilfs_last_cno(nilfs)) {
896 printk(KERN_WARNING "NILFS (device %s): couldn't "
897 "remount because the current RO-mount is not "
898 "the latest one.\n",
899 sb->s_id);
900 err = -EINVAL;
Ryusuke Konishie59399d2009-06-08 01:39:32 +0900901 goto restore_opts;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700902 }
903 sb->s_flags &= ~MS_RDONLY;
904 nilfs_clear_opt(sbi, SNAPSHOT);
905 sbi->s_snapshot_cno = 0;
906
Ryusuke Konishicece5522009-04-06 19:01:58 -0700907 err = nilfs_attach_segment_constructor(sbi);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700908 if (err)
Ryusuke Konishie59399d2009-06-08 01:39:32 +0900909 goto restore_opts;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700910
911 down_write(&nilfs->ns_sem);
912 nilfs_setup_super(sbi);
913 up_write(&nilfs->ns_sem);
914
Ryusuke Konishie59399d2009-06-08 01:39:32 +0900915 nilfs->ns_current = sbi;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700916 }
917 out:
Ryusuke Konishie59399d2009-06-08 01:39:32 +0900918 up_write(&nilfs->ns_super_sem);
Alessio Igor Bogani337eb002009-05-12 15:10:54 +0200919 unlock_kernel();
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700920 return 0;
921
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700922 restore_opts:
923 sb->s_flags = old_sb_flags;
924 sbi->s_mount_opt = old_opts.mount_opt;
925 sbi->s_snapshot_cno = old_opts.snapshot_cno;
Ryusuke Konishie59399d2009-06-08 01:39:32 +0900926 up_write(&nilfs->ns_super_sem);
Alessio Igor Bogani337eb002009-05-12 15:10:54 +0200927 unlock_kernel();
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700928 return err;
929}
930
931struct nilfs_super_data {
932 struct block_device *bdev;
Ryusuke Konishi6dd47402009-06-08 01:39:31 +0900933 struct nilfs_sb_info *sbi;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700934 __u64 cno;
935 int flags;
936};
937
938/**
939 * nilfs_identify - pre-read mount options needed to identify mount instance
940 * @data: mount options
941 * @sd: nilfs_super_data
942 */
943static int nilfs_identify(char *data, struct nilfs_super_data *sd)
944{
945 char *p, *options = data;
946 substring_t args[MAX_OPT_ARGS];
947 int option, token;
948 int ret = 0;
949
950 do {
951 p = strsep(&options, ",");
952 if (p != NULL && *p) {
953 token = match_token(p, tokens, args);
954 if (token == Opt_snapshot) {
955 if (!(sd->flags & MS_RDONLY))
956 ret++;
957 else {
958 ret = match_int(&args[0], &option);
959 if (!ret) {
960 if (option > 0)
961 sd->cno = option;
962 else
963 ret++;
964 }
965 }
966 }
967 if (ret)
968 printk(KERN_ERR
969 "NILFS: invalid mount option: %s\n", p);
970 }
971 if (!options)
972 break;
973 BUG_ON(options == data);
974 *(options - 1) = ',';
975 } while (!ret);
976 return ret;
977}
978
979static int nilfs_set_bdev_super(struct super_block *s, void *data)
980{
981 struct nilfs_super_data *sd = data;
982
983 s->s_bdev = sd->bdev;
984 s->s_dev = s->s_bdev->bd_dev;
985 return 0;
986}
987
988static int nilfs_test_bdev_super(struct super_block *s, void *data)
989{
990 struct nilfs_super_data *sd = data;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700991
Ryusuke Konishi6dd47402009-06-08 01:39:31 +0900992 return sd->sbi && s->s_fs_info == (void *)sd->sbi;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700993}
994
995static int
996nilfs_get_sb(struct file_system_type *fs_type, int flags,
997 const char *dev_name, void *data, struct vfsmount *mnt)
998{
999 struct nilfs_super_data sd;
Ryusuke Konishi33c8e572009-06-08 01:39:29 +09001000 struct super_block *s;
Ryusuke Konishi13e90552010-05-09 02:57:57 +09001001 fmode_t mode = FMODE_READ;
Ryusuke Konishi33c8e572009-06-08 01:39:29 +09001002 struct the_nilfs *nilfs;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001003 int err, need_to_close = 1;
1004
Ryusuke Konishi13e90552010-05-09 02:57:57 +09001005 if (!(flags & MS_RDONLY))
1006 mode |= FMODE_WRITE;
1007
1008 sd.bdev = open_bdev_exclusive(dev_name, mode, fs_type);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001009 if (IS_ERR(sd.bdev))
1010 return PTR_ERR(sd.bdev);
1011
1012 /*
1013 * To get mount instance using sget() vfs-routine, NILFS needs
1014 * much more information than normal filesystems to identify mount
1015 * instance. For snapshot mounts, not only a mount type (ro-mount
1016 * or rw-mount) but also a checkpoint number is required.
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001017 */
1018 sd.cno = 0;
1019 sd.flags = flags;
1020 if (nilfs_identify((char *)data, &sd)) {
1021 err = -EINVAL;
1022 goto failed;
1023 }
1024
Ryusuke Konishi33c8e572009-06-08 01:39:29 +09001025 nilfs = find_or_create_nilfs(sd.bdev);
1026 if (!nilfs) {
1027 err = -ENOMEM;
1028 goto failed;
1029 }
1030
Ryusuke Konishiaa7dfb82009-06-08 01:39:33 +09001031 mutex_lock(&nilfs->ns_mount_mutex);
Ryusuke Konishi3f82ff52009-06-08 01:39:30 +09001032
1033 if (!sd.cno) {
1034 /*
1035 * Check if an exclusive mount exists or not.
1036 * Snapshot mounts coexist with a current mount
1037 * (i.e. rw-mount or ro-mount), whereas rw-mount and
1038 * ro-mount are mutually exclusive.
1039 */
Ryusuke Konishie59399d2009-06-08 01:39:32 +09001040 down_read(&nilfs->ns_super_sem);
Ryusuke Konishi3f82ff52009-06-08 01:39:30 +09001041 if (nilfs->ns_current &&
1042 ((nilfs->ns_current->s_super->s_flags ^ flags)
1043 & MS_RDONLY)) {
Ryusuke Konishie59399d2009-06-08 01:39:32 +09001044 up_read(&nilfs->ns_super_sem);
Ryusuke Konishi3f82ff52009-06-08 01:39:30 +09001045 err = -EBUSY;
1046 goto failed_unlock;
1047 }
Ryusuke Konishie59399d2009-06-08 01:39:32 +09001048 up_read(&nilfs->ns_super_sem);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001049 }
1050
1051 /*
Ryusuke Konishi6dd47402009-06-08 01:39:31 +09001052 * Find existing nilfs_sb_info struct
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001053 */
Ryusuke Konishi6dd47402009-06-08 01:39:31 +09001054 sd.sbi = nilfs_find_sbinfo(nilfs, !(flags & MS_RDONLY), sd.cno);
1055
Ryusuke Konishi6dd47402009-06-08 01:39:31 +09001056 /*
1057 * Get super block instance holding the nilfs_sb_info struct.
1058 * A new instance is allocated if no existing mount is present or
1059 * existing instance has been unmounted.
1060 */
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001061 s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, &sd);
Ryusuke Konishi6dd47402009-06-08 01:39:31 +09001062 if (sd.sbi)
1063 nilfs_put_sbinfo(sd.sbi);
1064
Ryusuke Konishi33c8e572009-06-08 01:39:29 +09001065 if (IS_ERR(s)) {
1066 err = PTR_ERR(s);
1067 goto failed_unlock;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001068 }
1069
1070 if (!s->s_root) {
1071 char b[BDEVNAME_SIZE];
1072
Ryusuke Konishi33c8e572009-06-08 01:39:29 +09001073 /* New superblock instance created */
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001074 s->s_flags = flags;
Ryusuke Konishi4571b822010-05-09 03:01:32 +09001075 s->s_mode = mode;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001076 strlcpy(s->s_id, bdevname(sd.bdev, b), sizeof(s->s_id));
1077 sb_set_blocksize(s, block_size(sd.bdev));
1078
Ryusuke Konishie2d15912010-05-09 09:48:31 +09001079 err = nilfs_fill_super(s, data, flags & MS_SILENT ? 1 : 0,
1080 nilfs);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001081 if (err)
1082 goto cancel_new;
1083
1084 s->s_flags |= MS_ACTIVE;
1085 need_to_close = 0;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001086 }
1087
Ryusuke Konishiaa7dfb82009-06-08 01:39:33 +09001088 mutex_unlock(&nilfs->ns_mount_mutex);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001089 put_nilfs(nilfs);
1090 if (need_to_close)
Ryusuke Konishi13e90552010-05-09 02:57:57 +09001091 close_bdev_exclusive(sd.bdev, mode);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001092 simple_set_mnt(mnt, s);
1093 return 0;
1094
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001095 failed_unlock:
Ryusuke Konishiaa7dfb82009-06-08 01:39:33 +09001096 mutex_unlock(&nilfs->ns_mount_mutex);
Ryusuke Konishi33c8e572009-06-08 01:39:29 +09001097 put_nilfs(nilfs);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001098 failed:
Ryusuke Konishi13e90552010-05-09 02:57:57 +09001099 close_bdev_exclusive(sd.bdev, mode);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001100
1101 return err;
1102
1103 cancel_new:
1104 /* Abandoning the newly allocated superblock */
Ryusuke Konishiaa7dfb82009-06-08 01:39:33 +09001105 mutex_unlock(&nilfs->ns_mount_mutex);
Ryusuke Konishi33c8e572009-06-08 01:39:29 +09001106 put_nilfs(nilfs);
Al Viroa95161a2009-08-09 00:52:02 +04001107 deactivate_locked_super(s);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001108 /*
Ryusuke Konishib87ca912010-05-09 10:05:21 +09001109 * deactivate_locked_super() invokes close_bdev_exclusive().
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001110 * We must finish all post-cleaning before this call;
Ryusuke Konishiaa7dfb82009-06-08 01:39:33 +09001111 * put_nilfs() needs the block device.
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001112 */
1113 return err;
1114}
1115
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001116struct file_system_type nilfs_fs_type = {
1117 .owner = THIS_MODULE,
1118 .name = "nilfs2",
1119 .get_sb = nilfs_get_sb,
1120 .kill_sb = kill_block_super,
1121 .fs_flags = FS_REQUIRES_DEV,
1122};
1123
Li Hong41c88bd2010-04-06 00:54:11 +08001124static void nilfs_inode_init_once(void *obj)
1125{
1126 struct nilfs_inode_info *ii = obj;
1127
1128 INIT_LIST_HEAD(&ii->i_dirty);
1129#ifdef CONFIG_NILFS_XATTR
1130 init_rwsem(&ii->xattr_sem);
1131#endif
1132 nilfs_btnode_cache_init_once(&ii->i_btnode_cache);
1133 ii->i_bmap = (struct nilfs_bmap *)&ii->i_bmap_union;
1134 inode_init_once(&ii->vfs_inode);
1135}
1136
1137static void nilfs_segbuf_init_once(void *obj)
1138{
1139 memset(obj, 0, sizeof(struct nilfs_segment_buffer));
1140}
1141
1142static void nilfs_destroy_cachep(void)
1143{
1144 if (nilfs_inode_cachep)
1145 kmem_cache_destroy(nilfs_inode_cachep);
1146 if (nilfs_transaction_cachep)
1147 kmem_cache_destroy(nilfs_transaction_cachep);
1148 if (nilfs_segbuf_cachep)
1149 kmem_cache_destroy(nilfs_segbuf_cachep);
1150 if (nilfs_btree_path_cache)
1151 kmem_cache_destroy(nilfs_btree_path_cache);
1152}
1153
1154static int __init nilfs_init_cachep(void)
1155{
1156 nilfs_inode_cachep = kmem_cache_create("nilfs2_inode_cache",
1157 sizeof(struct nilfs_inode_info), 0,
1158 SLAB_RECLAIM_ACCOUNT, nilfs_inode_init_once);
1159 if (!nilfs_inode_cachep)
1160 goto fail;
1161
1162 nilfs_transaction_cachep = kmem_cache_create("nilfs2_transaction_cache",
1163 sizeof(struct nilfs_transaction_info), 0,
1164 SLAB_RECLAIM_ACCOUNT, NULL);
1165 if (!nilfs_transaction_cachep)
1166 goto fail;
1167
1168 nilfs_segbuf_cachep = kmem_cache_create("nilfs2_segbuf_cache",
1169 sizeof(struct nilfs_segment_buffer), 0,
1170 SLAB_RECLAIM_ACCOUNT, nilfs_segbuf_init_once);
1171 if (!nilfs_segbuf_cachep)
1172 goto fail;
1173
1174 nilfs_btree_path_cache = kmem_cache_create("nilfs2_btree_path_cache",
1175 sizeof(struct nilfs_btree_path) * NILFS_BTREE_LEVEL_MAX,
1176 0, 0, NULL);
1177 if (!nilfs_btree_path_cache)
1178 goto fail;
1179
1180 return 0;
1181
1182fail:
1183 nilfs_destroy_cachep();
1184 return -ENOMEM;
1185}
1186
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001187static int __init init_nilfs_fs(void)
1188{
1189 int err;
1190
Li Hong41c88bd2010-04-06 00:54:11 +08001191 err = nilfs_init_cachep();
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001192 if (err)
Li Hong41c88bd2010-04-06 00:54:11 +08001193 goto fail;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001194
1195 err = register_filesystem(&nilfs_fs_type);
1196 if (err)
Li Hong41c88bd2010-04-06 00:54:11 +08001197 goto free_cachep;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001198
Li Hong9f130262010-04-09 23:09:53 +08001199 printk(KERN_INFO "NILFS version 2 loaded\n");
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001200 return 0;
1201
Li Hong41c88bd2010-04-06 00:54:11 +08001202free_cachep:
1203 nilfs_destroy_cachep();
1204fail:
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001205 return err;
1206}
1207
1208static void __exit exit_nilfs_fs(void)
1209{
Li Hong41c88bd2010-04-06 00:54:11 +08001210 nilfs_destroy_cachep();
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001211 unregister_filesystem(&nilfs_fs_type);
1212}
1213
1214module_init(init_nilfs_fs)
1215module_exit(exit_nilfs_fs)