blob: 0994f6a76c0799ec86a482288256522a5735f72a [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>
Ryusuke Konishi783f6182009-04-06 19:01:35 -070048#include <linux/vfs.h>
49#include <linux/writeback.h>
Jiro SEKIBAb58a2852009-06-24 20:06:34 +090050#include <linux/seq_file.h>
51#include <linux/mount.h>
Ryusuke Konishi783f6182009-04-06 19:01:35 -070052#include "nilfs.h"
Ryusuke Konishi8e656fd2010-08-27 00:23:02 +090053#include "export.h"
Ryusuke Konishi783f6182009-04-06 19:01:35 -070054#include "mdt.h"
55#include "alloc.h"
Ryusuke Konishi05d0e942010-07-10 20:52:09 +090056#include "btree.h"
57#include "btnode.h"
Ryusuke Konishi783f6182009-04-06 19:01:35 -070058#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
Jiro SEKIBAabc0b502010-10-08 22:37:27 +090070static struct kmem_cache *nilfs_inode_cachep;
Li Hong41c88bd2010-04-06 00:54:11 +080071struct kmem_cache *nilfs_transaction_cachep;
72struct kmem_cache *nilfs_segbuf_cachep;
73struct kmem_cache *nilfs_btree_path_cache;
74
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +090075static int nilfs_setup_super(struct nilfs_sb_info *sbi, int is_mount);
Ryusuke Konishi783f6182009-04-06 19:01:35 -070076static int nilfs_remount(struct super_block *sb, int *flags, char *data);
Ryusuke Konishi783f6182009-04-06 19:01:35 -070077
Ryusuke Konishic8a11c82010-06-28 17:49:30 +090078static void nilfs_set_error(struct nilfs_sb_info *sbi)
79{
80 struct the_nilfs *nilfs = sbi->s_nilfs;
Jiro SEKIBAd26493b2010-06-28 17:49:32 +090081 struct nilfs_super_block **sbp;
Ryusuke Konishic8a11c82010-06-28 17:49:30 +090082
83 down_write(&nilfs->ns_sem);
84 if (!(nilfs->ns_mount_state & NILFS_ERROR_FS)) {
85 nilfs->ns_mount_state |= NILFS_ERROR_FS;
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +090086 sbp = nilfs_prepare_super(sbi, 0);
Jiro SEKIBAd26493b2010-06-28 17:49:32 +090087 if (likely(sbp)) {
88 sbp[0]->s_state |= cpu_to_le16(NILFS_ERROR_FS);
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +090089 if (sbp[1])
90 sbp[1]->s_state |= cpu_to_le16(NILFS_ERROR_FS);
91 nilfs_commit_super(sbi, NILFS_SB_COMMIT_ALL);
Jiro SEKIBAd26493b2010-06-28 17:49:32 +090092 }
Ryusuke Konishic8a11c82010-06-28 17:49:30 +090093 }
94 up_write(&nilfs->ns_sem);
95}
96
Ryusuke Konishi783f6182009-04-06 19:01:35 -070097/**
98 * nilfs_error() - report failure condition on a filesystem
99 *
100 * nilfs_error() sets an ERROR_FS flag on the superblock as well as
101 * reporting an error message. It should be called when NILFS detects
102 * incoherences or defects of meta data on disk. As for sustainable
103 * errors such as a single-shot I/O error, nilfs_warning() or the printk()
104 * function should be used instead.
105 *
106 * The segment constructor must not call this function because it can
107 * kill itself.
108 */
109void nilfs_error(struct super_block *sb, const char *function,
110 const char *fmt, ...)
111{
112 struct nilfs_sb_info *sbi = NILFS_SB(sb);
Joe Perchesb004a5e2010-11-09 16:35:21 -0800113 struct va_format vaf;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700114 va_list args;
115
116 va_start(args, fmt);
Joe Perchesb004a5e2010-11-09 16:35:21 -0800117
118 vaf.fmt = fmt;
119 vaf.va = &args;
120
121 printk(KERN_CRIT "NILFS error (device %s): %s: %pV\n",
122 sb->s_id, function, &vaf);
123
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700124 va_end(args);
125
126 if (!(sb->s_flags & MS_RDONLY)) {
Ryusuke Konishic8a11c82010-06-28 17:49:30 +0900127 nilfs_set_error(sbi);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700128
129 if (nilfs_test_opt(sbi, ERRORS_RO)) {
130 printk(KERN_CRIT "Remounting filesystem read-only\n");
131 sb->s_flags |= MS_RDONLY;
132 }
133 }
134
135 if (nilfs_test_opt(sbi, ERRORS_PANIC))
136 panic("NILFS (device %s): panic forced after error\n",
137 sb->s_id);
138}
139
140void nilfs_warning(struct super_block *sb, const char *function,
141 const char *fmt, ...)
142{
Joe Perchesb004a5e2010-11-09 16:35:21 -0800143 struct va_format vaf;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700144 va_list args;
145
146 va_start(args, fmt);
Joe Perchesb004a5e2010-11-09 16:35:21 -0800147
148 vaf.fmt = fmt;
149 vaf.va = &args;
150
151 printk(KERN_WARNING "NILFS warning (device %s): %s: %pV\n",
152 sb->s_id, function, &vaf);
153
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700154 va_end(args);
155}
156
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700157
Ryusuke Konishi2879ed62010-09-05 13:35:53 +0900158struct inode *nilfs_alloc_inode(struct super_block *sb)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700159{
160 struct nilfs_inode_info *ii;
161
162 ii = kmem_cache_alloc(nilfs_inode_cachep, GFP_NOFS);
163 if (!ii)
164 return NULL;
165 ii->i_bh = NULL;
166 ii->i_state = 0;
Ryusuke Konishi0e14a352010-08-20 21:20:29 +0900167 ii->i_cno = 0;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700168 ii->vfs_inode.i_version = 1;
Ryusuke Konishi2879ed62010-09-05 13:35:53 +0900169 nilfs_btnode_cache_init(&ii->i_btnode_cache, sb->s_bdi);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700170 return &ii->vfs_inode;
171}
172
Nick Pigginfa0d7e32011-01-07 17:49:49 +1100173static void nilfs_i_callback(struct rcu_head *head)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700174{
Nick Pigginfa0d7e32011-01-07 17:49:49 +1100175 struct inode *inode = container_of(head, struct inode, i_rcu);
Ryusuke Konishib91c9a92010-08-20 23:46:06 +0900176 struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
177
Nick Pigginfa0d7e32011-01-07 17:49:49 +1100178 INIT_LIST_HEAD(&inode->i_dentry);
179
Ryusuke Konishib91c9a92010-08-20 23:46:06 +0900180 if (mdi) {
181 kfree(mdi->mi_bgl); /* kfree(NULL) is safe */
182 kfree(mdi);
183 }
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700184 kmem_cache_free(nilfs_inode_cachep, NILFS_I(inode));
185}
186
Nick Pigginfa0d7e32011-01-07 17:49:49 +1100187void nilfs_destroy_inode(struct inode *inode)
188{
189 call_rcu(&inode->i_rcu, nilfs_i_callback);
190}
191
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900192static int nilfs_sync_super(struct nilfs_sb_info *sbi, int flag)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700193{
194 struct the_nilfs *nilfs = sbi->s_nilfs;
195 int err;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700196
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700197 retry:
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700198 set_buffer_dirty(nilfs->ns_sbh[0]);
Christoph Hellwig87e99512010-08-11 17:05:45 +0200199 if (nilfs_test_opt(sbi, BARRIER)) {
200 err = __sync_dirty_buffer(nilfs->ns_sbh[0],
Christoph Hellwigf8c131f2010-08-18 05:29:15 -0400201 WRITE_SYNC | WRITE_FLUSH_FUA);
Christoph Hellwig87e99512010-08-11 17:05:45 +0200202 } else {
203 err = sync_dirty_buffer(nilfs->ns_sbh[0]);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700204 }
Christoph Hellwig87e99512010-08-11 17:05:45 +0200205
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700206 if (unlikely(err)) {
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700207 printk(KERN_ERR
208 "NILFS: unable to write superblock (err=%d)\n", err);
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700209 if (err == -EIO && nilfs->ns_sbh[1]) {
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900210 /*
211 * sbp[0] points to newer log than sbp[1],
212 * so copy sbp[0] to sbp[1] to take over sbp[0].
213 */
214 memcpy(nilfs->ns_sbp[1], nilfs->ns_sbp[0],
215 nilfs->ns_sbsize);
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700216 nilfs_fall_back_super_block(nilfs);
217 goto retry;
218 }
219 } else {
220 struct nilfs_super_block *sbp = nilfs->ns_sbp[0];
221
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900222 nilfs->ns_sbwcount++;
223
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700224 /*
225 * The latest segment becomes trailable from the position
226 * written in superblock.
227 */
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700228 clear_nilfs_discontinued(nilfs);
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700229
230 /* update GC protection for recent segments */
231 if (nilfs->ns_sbh[1]) {
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900232 if (flag == NILFS_SB_COMMIT_ALL) {
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700233 set_buffer_dirty(nilfs->ns_sbh[1]);
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900234 if (sync_dirty_buffer(nilfs->ns_sbh[1]) < 0)
235 goto out;
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700236 }
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900237 if (le64_to_cpu(nilfs->ns_sbp[1]->s_last_cno) <
238 le64_to_cpu(nilfs->ns_sbp[0]->s_last_cno))
239 sbp = nilfs->ns_sbp[1];
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700240 }
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700241
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900242 spin_lock(&nilfs->ns_last_segment_lock);
243 nilfs->ns_prot_seq = le64_to_cpu(sbp->s_last_seq);
244 spin_unlock(&nilfs->ns_last_segment_lock);
245 }
246 out:
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700247 return err;
248}
249
Ryusuke Konishi60f46b72010-06-28 17:49:31 +0900250void nilfs_set_log_cursor(struct nilfs_super_block *sbp,
251 struct the_nilfs *nilfs)
252{
253 sector_t nfreeblocks;
254
255 /* nilfs->ns_sem must be locked by the caller. */
256 nilfs_count_free_blocks(nilfs, &nfreeblocks);
257 sbp->s_free_blocks_count = cpu_to_le64(nfreeblocks);
258
259 spin_lock(&nilfs->ns_last_segment_lock);
260 sbp->s_last_seq = cpu_to_le64(nilfs->ns_last_seq);
261 sbp->s_last_pseg = cpu_to_le64(nilfs->ns_last_pseg);
262 sbp->s_last_cno = cpu_to_le64(nilfs->ns_last_cno);
263 spin_unlock(&nilfs->ns_last_segment_lock);
264}
265
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900266struct nilfs_super_block **nilfs_prepare_super(struct nilfs_sb_info *sbi,
267 int flip)
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900268{
269 struct the_nilfs *nilfs = sbi->s_nilfs;
270 struct nilfs_super_block **sbp = nilfs->ns_sbp;
271
272 /* nilfs->ns_sem must be locked by the caller. */
273 if (sbp[0]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) {
274 if (sbp[1] &&
275 sbp[1]->s_magic == cpu_to_le16(NILFS_SUPER_MAGIC)) {
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900276 memcpy(sbp[0], sbp[1], nilfs->ns_sbsize);
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900277 } else {
278 printk(KERN_CRIT "NILFS: superblock broke on dev %s\n",
279 sbi->s_super->s_id);
280 return NULL;
281 }
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900282 } else if (sbp[1] &&
283 sbp[1]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) {
284 memcpy(sbp[1], sbp[0], nilfs->ns_sbsize);
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900285 }
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900286
287 if (flip && sbp[1])
288 nilfs_swap_super_block(nilfs);
289
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900290 return sbp;
291}
292
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900293int nilfs_commit_super(struct nilfs_sb_info *sbi, int flag)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700294{
295 struct the_nilfs *nilfs = sbi->s_nilfs;
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700296 struct nilfs_super_block **sbp = nilfs->ns_sbp;
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700297 time_t t;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700298
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900299 /* nilfs->ns_sem must be locked by the caller. */
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700300 t = get_seconds();
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900301 nilfs->ns_sbwtime = t;
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700302 sbp[0]->s_wtime = cpu_to_le64(t);
303 sbp[0]->s_sum = 0;
304 sbp[0]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed,
305 (unsigned char *)sbp[0],
306 nilfs->ns_sbsize));
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900307 if (flag == NILFS_SB_COMMIT_ALL && sbp[1]) {
308 sbp[1]->s_wtime = sbp[0]->s_wtime;
309 sbp[1]->s_sum = 0;
310 sbp[1]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed,
311 (unsigned char *)sbp[1],
312 nilfs->ns_sbsize));
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700313 }
Ryusuke Konishie605f0a2009-12-09 00:57:52 +0900314 clear_nilfs_sb_dirty(nilfs);
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900315 return nilfs_sync_super(sbi, flag);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700316}
317
Ryusuke Konishi7ecaa462010-06-28 17:49:29 +0900318/**
319 * nilfs_cleanup_super() - write filesystem state for cleanup
320 * @sbi: nilfs_sb_info to be unmounted or degraded to read-only
321 *
322 * This function restores state flags in the on-disk super block.
323 * This will set "clean" flag (i.e. NILFS_VALID_FS) unless the
324 * filesystem was not clean previously.
325 */
326int nilfs_cleanup_super(struct nilfs_sb_info *sbi)
327{
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900328 struct nilfs_super_block **sbp;
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900329 int flag = NILFS_SB_COMMIT;
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900330 int ret = -EIO;
Ryusuke Konishi7ecaa462010-06-28 17:49:29 +0900331
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900332 sbp = nilfs_prepare_super(sbi, 0);
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900333 if (sbp) {
334 sbp[0]->s_state = cpu_to_le16(sbi->s_nilfs->ns_mount_state);
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900335 nilfs_set_log_cursor(sbp[0], sbi->s_nilfs);
336 if (sbp[1] && sbp[0]->s_last_cno == sbp[1]->s_last_cno) {
337 /*
338 * make the "clean" flag also to the opposite
339 * super block if both super blocks point to
340 * the same checkpoint.
341 */
342 sbp[1]->s_state = sbp[0]->s_state;
343 flag = NILFS_SB_COMMIT_ALL;
344 }
345 ret = nilfs_commit_super(sbi, flag);
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900346 }
Ryusuke Konishi7ecaa462010-06-28 17:49:29 +0900347 return ret;
348}
349
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700350static void nilfs_put_super(struct super_block *sb)
351{
352 struct nilfs_sb_info *sbi = NILFS_SB(sb);
353 struct the_nilfs *nilfs = sbi->s_nilfs;
354
355 nilfs_detach_segment_constructor(sbi);
356
357 if (!(sb->s_flags & MS_RDONLY)) {
358 down_write(&nilfs->ns_sem);
Ryusuke Konishi7ecaa462010-06-28 17:49:29 +0900359 nilfs_cleanup_super(sbi);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700360 up_write(&nilfs->ns_sem);
361 }
362
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900363 iput(nilfs->ns_sufile);
364 iput(nilfs->ns_cpfile);
365 iput(nilfs->ns_dat);
366
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +0900367 destroy_nilfs(nilfs);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700368 sbi->s_super = NULL;
369 sb->s_fs_info = NULL;
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900370 kfree(sbi);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700371}
372
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700373static int nilfs_sync_fs(struct super_block *sb, int wait)
374{
Jiro SEKIBA6233caa2009-07-23 01:26:33 +0900375 struct nilfs_sb_info *sbi = NILFS_SB(sb);
376 struct the_nilfs *nilfs = sbi->s_nilfs;
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900377 struct nilfs_super_block **sbp;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700378 int err = 0;
379
380 /* This function is called when super block should be written back */
381 if (wait)
382 err = nilfs_construct_segment(sb);
Jiro SEKIBA6233caa2009-07-23 01:26:33 +0900383
384 down_write(&nilfs->ns_sem);
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900385 if (nilfs_sb_dirty(nilfs)) {
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900386 sbp = nilfs_prepare_super(sbi, nilfs_sb_will_flip(nilfs));
387 if (likely(sbp)) {
388 nilfs_set_log_cursor(sbp[0], nilfs);
389 nilfs_commit_super(sbi, NILFS_SB_COMMIT);
390 }
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900391 }
Jiro SEKIBA6233caa2009-07-23 01:26:33 +0900392 up_write(&nilfs->ns_sem);
393
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700394 return err;
395}
396
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900397int nilfs_attach_checkpoint(struct nilfs_sb_info *sbi, __u64 cno, int curr_mnt,
398 struct nilfs_root **rootp)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700399{
400 struct the_nilfs *nilfs = sbi->s_nilfs;
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900401 struct nilfs_root *root;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700402 struct nilfs_checkpoint *raw_cp;
403 struct buffer_head *bh_cp;
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900404 int err = -ENOMEM;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700405
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900406 root = nilfs_find_or_create_root(
407 nilfs, curr_mnt ? NILFS_CPTREE_CURRENT_CNO : cno);
408 if (!root)
409 return err;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700410
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900411 if (root->ifile)
412 goto reuse; /* already attached checkpoint */
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700413
Zhang Qiang1154ecb2009-08-18 14:58:24 +0800414 down_read(&nilfs->ns_segctor_sem);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700415 err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, cno, 0, &raw_cp,
416 &bh_cp);
Zhang Qiang1154ecb2009-08-18 14:58:24 +0800417 up_read(&nilfs->ns_segctor_sem);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700418 if (unlikely(err)) {
419 if (err == -ENOENT || err == -EINVAL) {
420 printk(KERN_ERR
421 "NILFS: Invalid checkpoint "
422 "(checkpoint number=%llu)\n",
423 (unsigned long long)cno);
424 err = -EINVAL;
425 }
426 goto failed;
427 }
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900428
429 err = nilfs_ifile_read(sbi->s_super, root, nilfs->ns_inode_size,
430 &raw_cp->cp_ifile_inode, &root->ifile);
431 if (err)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700432 goto failed_bh;
Ryusuke Konishib7c06342010-08-14 14:48:32 +0900433
434 atomic_set(&root->inodes_count, le64_to_cpu(raw_cp->cp_inodes_count));
435 atomic_set(&root->blocks_count, le64_to_cpu(raw_cp->cp_blocks_count));
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700436
437 nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp);
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900438
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900439 reuse:
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900440 *rootp = root;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700441 return 0;
442
443 failed_bh:
444 nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp);
445 failed:
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900446 nilfs_put_root(root);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700447
448 return err;
449}
450
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900451static int nilfs_freeze(struct super_block *sb)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700452{
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900453 struct nilfs_sb_info *sbi = NILFS_SB(sb);
454 struct the_nilfs *nilfs = sbi->s_nilfs;
455 int err;
456
457 if (sb->s_flags & MS_RDONLY)
458 return 0;
459
460 /* Mark super block clean */
461 down_write(&nilfs->ns_sem);
462 err = nilfs_cleanup_super(sbi);
463 up_write(&nilfs->ns_sem);
464 return err;
465}
466
467static int nilfs_unfreeze(struct super_block *sb)
468{
469 struct nilfs_sb_info *sbi = NILFS_SB(sb);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700470 struct the_nilfs *nilfs = sbi->s_nilfs;
471
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900472 if (sb->s_flags & MS_RDONLY)
473 return 0;
474
475 down_write(&nilfs->ns_sem);
476 nilfs_setup_super(sbi, false);
477 up_write(&nilfs->ns_sem);
478 return 0;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700479}
480
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700481static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf)
482{
483 struct super_block *sb = dentry->d_sb;
Ryusuke Konishib7c06342010-08-14 14:48:32 +0900484 struct nilfs_root *root = NILFS_I(dentry->d_inode)->i_root;
485 struct the_nilfs *nilfs = root->nilfs;
Ryusuke Konishic306af22009-03-26 10:16:57 +0900486 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700487 unsigned long long blocks;
488 unsigned long overhead;
489 unsigned long nrsvblocks;
490 sector_t nfreeblocks;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700491 int err;
492
493 /*
494 * Compute all of the segment blocks
495 *
496 * The blocks before first segment and after last segment
497 * are excluded.
498 */
499 blocks = nilfs->ns_blocks_per_segment * nilfs->ns_nsegments
500 - nilfs->ns_first_data_block;
501 nrsvblocks = nilfs->ns_nrsvsegs * nilfs->ns_blocks_per_segment;
502
503 /*
504 * Compute the overhead
505 *
Ryusuke Konishi7a650042010-03-14 03:32:40 +0900506 * When distributing meta data blocks outside segment structure,
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700507 * We must count them as the overhead.
508 */
509 overhead = 0;
510
511 err = nilfs_count_free_blocks(nilfs, &nfreeblocks);
512 if (unlikely(err))
513 return err;
514
515 buf->f_type = NILFS_SUPER_MAGIC;
516 buf->f_bsize = sb->s_blocksize;
517 buf->f_blocks = blocks - overhead;
518 buf->f_bfree = nfreeblocks;
519 buf->f_bavail = (buf->f_bfree >= nrsvblocks) ?
520 (buf->f_bfree - nrsvblocks) : 0;
Ryusuke Konishib7c06342010-08-14 14:48:32 +0900521 buf->f_files = atomic_read(&root->inodes_count);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700522 buf->f_ffree = 0; /* nilfs_count_free_inodes(sb); */
523 buf->f_namelen = NILFS_NAME_LEN;
Ryusuke Konishic306af22009-03-26 10:16:57 +0900524 buf->f_fsid.val[0] = (u32)id;
525 buf->f_fsid.val[1] = (u32)(id >> 32);
526
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700527 return 0;
528}
529
Jiro SEKIBAb58a2852009-06-24 20:06:34 +0900530static int nilfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
531{
532 struct super_block *sb = vfs->mnt_sb;
533 struct nilfs_sb_info *sbi = NILFS_SB(sb);
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900534 struct nilfs_root *root = NILFS_I(vfs->mnt_root->d_inode)->i_root;
Jiro SEKIBAb58a2852009-06-24 20:06:34 +0900535
536 if (!nilfs_test_opt(sbi, BARRIER))
Ryusuke Konishic6b4d572010-07-05 14:40:27 +0900537 seq_puts(seq, ",nobarrier");
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900538 if (root->cno != NILFS_CPTREE_CURRENT_CNO)
539 seq_printf(seq, ",cp=%llu", (unsigned long long)root->cno);
Jiro SEKIBAb58a2852009-06-24 20:06:34 +0900540 if (nilfs_test_opt(sbi, ERRORS_PANIC))
Ryusuke Konishic6b4d572010-07-05 14:40:27 +0900541 seq_puts(seq, ",errors=panic");
Ryusuke Konishi277a6a32010-04-02 18:02:33 +0900542 if (nilfs_test_opt(sbi, ERRORS_CONT))
Ryusuke Konishic6b4d572010-07-05 14:40:27 +0900543 seq_puts(seq, ",errors=continue");
Jiro SEKIBAb58a2852009-06-24 20:06:34 +0900544 if (nilfs_test_opt(sbi, STRICT_ORDER))
Ryusuke Konishic6b4d572010-07-05 14:40:27 +0900545 seq_puts(seq, ",order=strict");
Ryusuke Konishi02345762009-11-20 03:28:01 +0900546 if (nilfs_test_opt(sbi, NORECOVERY))
Ryusuke Konishic6b4d572010-07-05 14:40:27 +0900547 seq_puts(seq, ",norecovery");
Jiro SEKIBAe902ec92010-01-30 18:06:35 +0900548 if (nilfs_test_opt(sbi, DISCARD))
Ryusuke Konishic6b4d572010-07-05 14:40:27 +0900549 seq_puts(seq, ",discard");
Jiro SEKIBAb58a2852009-06-24 20:06:34 +0900550
551 return 0;
552}
553
Alexey Dobriyanb87221d2009-09-21 17:01:09 -0700554static const struct super_operations nilfs_sops = {
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700555 .alloc_inode = nilfs_alloc_inode,
556 .destroy_inode = nilfs_destroy_inode,
557 .dirty_inode = nilfs_dirty_inode,
558 /* .write_inode = nilfs_write_inode, */
559 /* .put_inode = nilfs_put_inode, */
560 /* .drop_inode = nilfs_drop_inode, */
Al Viro6fd1e5c2010-06-07 11:55:00 -0400561 .evict_inode = nilfs_evict_inode,
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700562 .put_super = nilfs_put_super,
Jiro SEKIBA1dfa2712009-07-23 01:33:49 +0900563 /* .write_super = nilfs_write_super, */
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700564 .sync_fs = nilfs_sync_fs,
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900565 .freeze_fs = nilfs_freeze,
566 .unfreeze_fs = nilfs_unfreeze,
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700567 /* .write_super_lockfs */
568 /* .unlockfs */
569 .statfs = nilfs_statfs,
570 .remount_fs = nilfs_remount,
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700571 /* .umount_begin */
Jiro SEKIBAb58a2852009-06-24 20:06:34 +0900572 .show_options = nilfs_show_options
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700573};
574
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700575enum {
576 Opt_err_cont, Opt_err_panic, Opt_err_ro,
Ryusuke Konishi773bc4f2010-07-05 13:00:08 +0900577 Opt_barrier, Opt_nobarrier, Opt_snapshot, Opt_order, Opt_norecovery,
Ryusuke Konishi802d3172010-07-05 14:27:04 +0900578 Opt_discard, Opt_nodiscard, Opt_err,
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700579};
580
581static match_table_t tokens = {
582 {Opt_err_cont, "errors=continue"},
583 {Opt_err_panic, "errors=panic"},
584 {Opt_err_ro, "errors=remount-ro"},
Ryusuke Konishi773bc4f2010-07-05 13:00:08 +0900585 {Opt_barrier, "barrier"},
Jiro SEKIBA91f19532009-11-12 14:07:26 +0900586 {Opt_nobarrier, "nobarrier"},
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700587 {Opt_snapshot, "cp=%u"},
588 {Opt_order, "order=%s"},
Ryusuke Konishi02345762009-11-20 03:28:01 +0900589 {Opt_norecovery, "norecovery"},
Jiro SEKIBAe902ec92010-01-30 18:06:35 +0900590 {Opt_discard, "discard"},
Ryusuke Konishi802d3172010-07-05 14:27:04 +0900591 {Opt_nodiscard, "nodiscard"},
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700592 {Opt_err, NULL}
593};
594
Ryusuke Konishi7c017452010-07-05 20:08:33 +0900595static int parse_options(char *options, struct super_block *sb, int is_remount)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700596{
597 struct nilfs_sb_info *sbi = NILFS_SB(sb);
598 char *p;
599 substring_t args[MAX_OPT_ARGS];
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700600
601 if (!options)
602 return 1;
603
604 while ((p = strsep(&options, ",")) != NULL) {
605 int token;
606 if (!*p)
607 continue;
608
609 token = match_token(p, tokens, args);
610 switch (token) {
Ryusuke Konishi773bc4f2010-07-05 13:00:08 +0900611 case Opt_barrier:
612 nilfs_set_opt(sbi, BARRIER);
613 break;
Jiro SEKIBA91f19532009-11-12 14:07:26 +0900614 case Opt_nobarrier:
615 nilfs_clear_opt(sbi, BARRIER);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700616 break;
617 case Opt_order:
618 if (strcmp(args[0].from, "relaxed") == 0)
619 /* Ordered data semantics */
620 nilfs_clear_opt(sbi, STRICT_ORDER);
621 else if (strcmp(args[0].from, "strict") == 0)
622 /* Strict in-order semantics */
623 nilfs_set_opt(sbi, STRICT_ORDER);
624 else
625 return 0;
626 break;
627 case Opt_err_panic:
628 nilfs_write_opt(sbi, ERROR_MODE, ERRORS_PANIC);
629 break;
630 case Opt_err_ro:
631 nilfs_write_opt(sbi, ERROR_MODE, ERRORS_RO);
632 break;
633 case Opt_err_cont:
634 nilfs_write_opt(sbi, ERROR_MODE, ERRORS_CONT);
635 break;
636 case Opt_snapshot:
Ryusuke Konishi7c017452010-07-05 20:08:33 +0900637 if (is_remount) {
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900638 printk(KERN_ERR
639 "NILFS: \"%s\" option is invalid "
640 "for remount.\n", p);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700641 return 0;
Ryusuke Konishi7c017452010-07-05 20:08:33 +0900642 }
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700643 break;
Ryusuke Konishi02345762009-11-20 03:28:01 +0900644 case Opt_norecovery:
645 nilfs_set_opt(sbi, NORECOVERY);
646 break;
Jiro SEKIBAe902ec92010-01-30 18:06:35 +0900647 case Opt_discard:
648 nilfs_set_opt(sbi, DISCARD);
649 break;
Ryusuke Konishi802d3172010-07-05 14:27:04 +0900650 case Opt_nodiscard:
651 nilfs_clear_opt(sbi, DISCARD);
652 break;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700653 default:
654 printk(KERN_ERR
655 "NILFS: Unrecognized mount option \"%s\"\n", p);
656 return 0;
657 }
658 }
659 return 1;
660}
661
662static inline void
663nilfs_set_default_options(struct nilfs_sb_info *sbi,
664 struct nilfs_super_block *sbp)
665{
666 sbi->s_mount_opt =
Ryusuke Konishi277a6a32010-04-02 18:02:33 +0900667 NILFS_MOUNT_ERRORS_RO | NILFS_MOUNT_BARRIER;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700668}
669
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900670static int nilfs_setup_super(struct nilfs_sb_info *sbi, int is_mount)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700671{
672 struct the_nilfs *nilfs = sbi->s_nilfs;
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900673 struct nilfs_super_block **sbp;
674 int max_mnt_count;
675 int mnt_count;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700676
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900677 /* nilfs->ns_sem must be locked by the caller. */
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900678 sbp = nilfs_prepare_super(sbi, 0);
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900679 if (!sbp)
680 return -EIO;
681
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900682 if (!is_mount)
683 goto skip_mount_setup;
684
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900685 max_mnt_count = le16_to_cpu(sbp[0]->s_max_mnt_count);
686 mnt_count = le16_to_cpu(sbp[0]->s_mnt_count);
687
Ryusuke Konishif50a4c82009-11-19 16:58:40 +0900688 if (nilfs->ns_mount_state & NILFS_ERROR_FS) {
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700689 printk(KERN_WARNING
690 "NILFS warning: mounting fs with errors\n");
691#if 0
692 } else if (max_mnt_count >= 0 && mnt_count >= max_mnt_count) {
693 printk(KERN_WARNING
694 "NILFS warning: maximal mount count reached\n");
695#endif
696 }
697 if (!max_mnt_count)
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900698 sbp[0]->s_max_mnt_count = cpu_to_le16(NILFS_DFL_MAX_MNT_COUNT);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700699
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900700 sbp[0]->s_mnt_count = cpu_to_le16(mnt_count + 1);
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900701 sbp[0]->s_mtime = cpu_to_le64(get_seconds());
702
703skip_mount_setup:
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900704 sbp[0]->s_state =
705 cpu_to_le16(le16_to_cpu(sbp[0]->s_state) & ~NILFS_VALID_FS);
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900706 /* synchronize sbp[1] with sbp[0] */
707 memcpy(sbp[1], sbp[0], nilfs->ns_sbsize);
708 return nilfs_commit_super(sbi, NILFS_SB_COMMIT_ALL);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700709}
710
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700711struct nilfs_super_block *nilfs_read_super_block(struct super_block *sb,
712 u64 pos, int blocksize,
713 struct buffer_head **pbh)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700714{
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700715 unsigned long long sb_index = pos;
716 unsigned long offset;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700717
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700718 offset = do_div(sb_index, blocksize);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700719 *pbh = sb_bread(sb, sb_index);
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700720 if (!*pbh)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700721 return NULL;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700722 return (struct nilfs_super_block *)((char *)(*pbh)->b_data + offset);
723}
724
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700725int nilfs_store_magic_and_option(struct super_block *sb,
726 struct nilfs_super_block *sbp,
727 char *data)
728{
729 struct nilfs_sb_info *sbi = NILFS_SB(sb);
730
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700731 sb->s_magic = le16_to_cpu(sbp->s_magic);
732
733 /* FS independent flags */
734#ifdef NILFS_ATIME_DISABLE
735 sb->s_flags |= MS_NOATIME;
736#endif
737
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700738 nilfs_set_default_options(sbi, sbp);
739
740 sbi->s_resuid = le16_to_cpu(sbp->s_def_resuid);
741 sbi->s_resgid = le16_to_cpu(sbp->s_def_resgid);
742 sbi->s_interval = le32_to_cpu(sbp->s_c_interval);
743 sbi->s_watermark = le32_to_cpu(sbp->s_c_block_max);
744
Ryusuke Konishi7c017452010-07-05 20:08:33 +0900745 return !parse_options(data, sb, 0) ? -EINVAL : 0 ;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700746}
747
Ryusuke Konishic5ca48a2010-07-22 03:22:20 +0900748int nilfs_check_feature_compatibility(struct super_block *sb,
749 struct nilfs_super_block *sbp)
750{
751 __u64 features;
752
753 features = le64_to_cpu(sbp->s_feature_incompat) &
754 ~NILFS_FEATURE_INCOMPAT_SUPP;
755 if (features) {
756 printk(KERN_ERR "NILFS: couldn't mount because of unsupported "
757 "optional features (%llx)\n",
758 (unsigned long long)features);
759 return -EINVAL;
760 }
761 features = le64_to_cpu(sbp->s_feature_compat_ro) &
762 ~NILFS_FEATURE_COMPAT_RO_SUPP;
763 if (!(sb->s_flags & MS_RDONLY) && features) {
764 printk(KERN_ERR "NILFS: couldn't mount RDWR because of "
765 "unsupported optional features (%llx)\n",
766 (unsigned long long)features);
767 return -EINVAL;
768 }
769 return 0;
770}
771
Ryusuke Konishi367ea332010-08-26 01:52:51 +0900772static int nilfs_get_root_dentry(struct super_block *sb,
773 struct nilfs_root *root,
774 struct dentry **root_dentry)
775{
776 struct inode *inode;
777 struct dentry *dentry;
778 int ret = 0;
779
780 inode = nilfs_iget(sb, root, NILFS_ROOT_INO);
781 if (IS_ERR(inode)) {
782 printk(KERN_ERR "NILFS: get root inode failed\n");
783 ret = PTR_ERR(inode);
784 goto out;
785 }
786 if (!S_ISDIR(inode->i_mode) || !inode->i_blocks || !inode->i_size) {
787 iput(inode);
788 printk(KERN_ERR "NILFS: corrupt root inode.\n");
789 ret = -EINVAL;
790 goto out;
791 }
792
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900793 if (root->cno == NILFS_CPTREE_CURRENT_CNO) {
794 dentry = d_find_alias(inode);
795 if (!dentry) {
796 dentry = d_alloc_root(inode);
797 if (!dentry) {
798 iput(inode);
799 ret = -ENOMEM;
800 goto failed_dentry;
801 }
802 } else {
803 iput(inode);
804 }
805 } else {
806 dentry = d_obtain_alias(inode);
807 if (IS_ERR(dentry)) {
808 ret = PTR_ERR(dentry);
809 goto failed_dentry;
810 }
Ryusuke Konishi367ea332010-08-26 01:52:51 +0900811 }
812 *root_dentry = dentry;
813 out:
814 return ret;
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900815
816 failed_dentry:
817 printk(KERN_ERR "NILFS: get root dentry failed\n");
818 goto out;
Ryusuke Konishi367ea332010-08-26 01:52:51 +0900819}
820
Ryusuke Konishiab4d8f72010-08-26 02:15:41 +0900821static int nilfs_attach_snapshot(struct super_block *s, __u64 cno,
822 struct dentry **root_dentry)
823{
824 struct the_nilfs *nilfs = NILFS_SB(s)->s_nilfs;
825 struct nilfs_root *root;
826 int ret;
827
828 down_read(&nilfs->ns_segctor_sem);
829 ret = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile, cno);
830 up_read(&nilfs->ns_segctor_sem);
831 if (ret < 0) {
832 ret = (ret == -ENOENT) ? -EINVAL : ret;
833 goto out;
834 } else if (!ret) {
835 printk(KERN_ERR "NILFS: The specified checkpoint is "
836 "not a snapshot (checkpoint number=%llu).\n",
837 (unsigned long long)cno);
838 ret = -EINVAL;
839 goto out;
840 }
841
842 ret = nilfs_attach_checkpoint(NILFS_SB(s), cno, false, &root);
843 if (ret) {
844 printk(KERN_ERR "NILFS: error loading snapshot "
845 "(checkpoint number=%llu).\n",
846 (unsigned long long)cno);
847 goto out;
848 }
849 ret = nilfs_get_root_dentry(s, root, root_dentry);
850 nilfs_put_root(root);
851 out:
852 return ret;
853}
854
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900855static int nilfs_tree_was_touched(struct dentry *root_dentry)
856{
Nick Pigginb7ab39f2011-01-07 17:49:32 +1100857 return root_dentry->d_count > 1;
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900858}
859
860/**
861 * nilfs_try_to_shrink_tree() - try to shrink dentries of a checkpoint
862 * @root_dentry: root dentry of the tree to be shrunk
863 *
864 * This function returns true if the tree was in-use.
865 */
866static int nilfs_try_to_shrink_tree(struct dentry *root_dentry)
867{
868 if (have_submounts(root_dentry))
869 return true;
870 shrink_dcache_parent(root_dentry);
871 return nilfs_tree_was_touched(root_dentry);
872}
873
Ryusuke Konishi032dbb32010-09-13 11:16:34 +0900874int nilfs_checkpoint_is_mounted(struct super_block *sb, __u64 cno)
875{
876 struct the_nilfs *nilfs = NILFS_SB(sb)->s_nilfs;
877 struct nilfs_root *root;
878 struct inode *inode;
879 struct dentry *dentry;
880 int ret;
881
882 if (cno < 0 || cno > nilfs->ns_cno)
883 return false;
884
885 if (cno >= nilfs_last_cno(nilfs))
886 return true; /* protect recent checkpoints */
887
888 ret = false;
889 root = nilfs_lookup_root(NILFS_SB(sb)->s_nilfs, cno);
890 if (root) {
891 inode = nilfs_ilookup(sb, root, NILFS_ROOT_INO);
892 if (inode) {
893 dentry = d_find_alias(inode);
894 if (dentry) {
895 if (nilfs_tree_was_touched(dentry))
896 ret = nilfs_try_to_shrink_tree(dentry);
897 dput(dentry);
898 }
899 iput(inode);
900 }
901 nilfs_put_root(root);
902 }
903 return ret;
904}
905
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700906/**
907 * nilfs_fill_super() - initialize a super block instance
908 * @sb: super_block
909 * @data: mount options
910 * @silent: silent mode flag
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700911 *
Ryusuke Konishiaa7dfb82009-06-08 01:39:33 +0900912 * This function is called exclusively by nilfs->ns_mount_mutex.
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700913 * So, the recovery process is protected from other simultaneous mounts.
914 */
915static int
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +0900916nilfs_fill_super(struct super_block *sb, void *data, int silent)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700917{
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +0900918 struct the_nilfs *nilfs;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700919 struct nilfs_sb_info *sbi;
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900920 struct nilfs_root *fsroot;
Ryusuke Konishi026a7d62010-10-07 14:19:48 +0900921 struct backing_dev_info *bdi;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700922 __u64 cno;
923 int err;
924
925 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
926 if (!sbi)
927 return -ENOMEM;
928
929 sb->s_fs_info = sbi;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700930 sbi->s_super = sb;
931
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +0900932 nilfs = alloc_nilfs(sb->s_bdev);
933 if (!nilfs) {
934 err = -ENOMEM;
935 goto failed_sbi;
936 }
937 sbi->s_nilfs = nilfs;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700938
939 err = init_nilfs(nilfs, sbi, (char *)data);
940 if (err)
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +0900941 goto failed_nilfs;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700942
943 spin_lock_init(&sbi->s_inode_lock);
944 INIT_LIST_HEAD(&sbi->s_dirty_files);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700945
946 /*
947 * Following initialization is overlapped because
948 * nilfs_sb_info structure has been cleared at the beginning.
949 * But we reserve them to keep our interest and make ready
950 * for the future change.
951 */
952 get_random_bytes(&sbi->s_next_generation,
953 sizeof(sbi->s_next_generation));
954 spin_lock_init(&sbi->s_next_gen_lock);
955
956 sb->s_op = &nilfs_sops;
957 sb->s_export_op = &nilfs_export_ops;
958 sb->s_root = NULL;
Ryusuke Konishi61239232009-04-06 19:02:00 -0700959 sb->s_time_gran = 1;
Ryusuke Konishi026a7d62010-10-07 14:19:48 +0900960
961 bdi = sb->s_bdev->bd_inode->i_mapping->backing_dev_info;
962 sb->s_bdi = bdi ? : &default_backing_dev_info;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700963
Ryusuke Konishif50a4c82009-11-19 16:58:40 +0900964 err = load_nilfs(nilfs, sbi);
965 if (err)
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +0900966 goto failed_nilfs;
Ryusuke Konishif50a4c82009-11-19 16:58:40 +0900967
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700968 cno = nilfs_last_cno(nilfs);
Ryusuke Konishiab4d8f72010-08-26 02:15:41 +0900969 err = nilfs_attach_checkpoint(sbi, cno, true, &fsroot);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700970 if (err) {
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900971 printk(KERN_ERR "NILFS: error loading last checkpoint "
972 "(checkpoint number=%llu).\n", (unsigned long long)cno);
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900973 goto failed_unload;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700974 }
975
976 if (!(sb->s_flags & MS_RDONLY)) {
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900977 err = nilfs_attach_segment_constructor(sbi, fsroot);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700978 if (err)
979 goto failed_checkpoint;
980 }
981
Ryusuke Konishi367ea332010-08-26 01:52:51 +0900982 err = nilfs_get_root_dentry(sb, fsroot, &sb->s_root);
983 if (err)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700984 goto failed_segctor;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700985
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900986 nilfs_put_root(fsroot);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700987
988 if (!(sb->s_flags & MS_RDONLY)) {
989 down_write(&nilfs->ns_sem);
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900990 nilfs_setup_super(sbi, true);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700991 up_write(&nilfs->ns_sem);
992 }
993
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700994 return 0;
995
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700996 failed_segctor:
997 nilfs_detach_segment_constructor(sbi);
998
999 failed_checkpoint:
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +09001000 nilfs_put_root(fsroot);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001001
Ryusuke Konishif1e89c82010-09-05 12:20:59 +09001002 failed_unload:
1003 iput(nilfs->ns_sufile);
1004 iput(nilfs->ns_cpfile);
1005 iput(nilfs->ns_dat);
1006
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001007 failed_nilfs:
1008 destroy_nilfs(nilfs);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001009
1010 failed_sbi:
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001011 sb->s_fs_info = NULL;
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001012 kfree(sbi);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001013 return err;
1014}
1015
1016static int nilfs_remount(struct super_block *sb, int *flags, char *data)
1017{
1018 struct nilfs_sb_info *sbi = NILFS_SB(sb);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001019 struct the_nilfs *nilfs = sbi->s_nilfs;
1020 unsigned long old_sb_flags;
Ryusuke Konishi06df0f92010-12-27 00:04:06 +09001021 unsigned long old_mount_opt;
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001022 int err;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001023
1024 old_sb_flags = sb->s_flags;
Ryusuke Konishi06df0f92010-12-27 00:04:06 +09001025 old_mount_opt = sbi->s_mount_opt;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001026
Ryusuke Konishi7c017452010-07-05 20:08:33 +09001027 if (!parse_options(data, sb, 1)) {
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001028 err = -EINVAL;
1029 goto restore_opts;
1030 }
1031 sb->s_flags = (sb->s_flags & ~MS_POSIXACL);
1032
Ryusuke Konishid240e062010-05-09 21:51:53 +09001033 err = -EINVAL;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001034
Ryusuke Konishi02345762009-11-20 03:28:01 +09001035 if (!nilfs_valid_fs(nilfs)) {
1036 printk(KERN_WARNING "NILFS (device %s): couldn't "
1037 "remount because the filesystem is in an "
1038 "incomplete recovery state.\n", sb->s_id);
Ryusuke Konishi02345762009-11-20 03:28:01 +09001039 goto restore_opts;
1040 }
1041
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001042 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
1043 goto out;
1044 if (*flags & MS_RDONLY) {
1045 /* Shutting down the segment constructor */
1046 nilfs_detach_segment_constructor(sbi);
1047 sb->s_flags |= MS_RDONLY;
1048
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001049 /*
1050 * Remounting a valid RW partition RDONLY, so set
1051 * the RDONLY flag and then mark the partition as valid again.
1052 */
1053 down_write(&nilfs->ns_sem);
Ryusuke Konishi7ecaa462010-06-28 17:49:29 +09001054 nilfs_cleanup_super(sbi);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001055 up_write(&nilfs->ns_sem);
1056 } else {
Ryusuke Konishic5ca48a2010-07-22 03:22:20 +09001057 __u64 features;
Ryusuke Konishie912a5b2010-08-14 13:07:15 +09001058 struct nilfs_root *root;
Ryusuke Konishic5ca48a2010-07-22 03:22:20 +09001059
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001060 /*
1061 * Mounting a RDONLY partition read-write, so reread and
1062 * store the current valid flag. (It may have been changed
1063 * by fsck since we originally mounted the partition.)
1064 */
Ryusuke Konishic5ca48a2010-07-22 03:22:20 +09001065 down_read(&nilfs->ns_sem);
1066 features = le64_to_cpu(nilfs->ns_sbp[0]->s_feature_compat_ro) &
1067 ~NILFS_FEATURE_COMPAT_RO_SUPP;
1068 up_read(&nilfs->ns_sem);
1069 if (features) {
1070 printk(KERN_WARNING "NILFS (device %s): couldn't "
1071 "remount RDWR because of unsupported optional "
1072 "features (%llx)\n",
1073 sb->s_id, (unsigned long long)features);
1074 err = -EROFS;
1075 goto restore_opts;
1076 }
1077
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001078 sb->s_flags &= ~MS_RDONLY;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001079
Ryusuke Konishie912a5b2010-08-14 13:07:15 +09001080 root = NILFS_I(sb->s_root->d_inode)->i_root;
1081 err = nilfs_attach_segment_constructor(sbi, root);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001082 if (err)
Ryusuke Konishie59399d2009-06-08 01:39:32 +09001083 goto restore_opts;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001084
1085 down_write(&nilfs->ns_sem);
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +09001086 nilfs_setup_super(sbi, true);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001087 up_write(&nilfs->ns_sem);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001088 }
1089 out:
1090 return 0;
1091
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001092 restore_opts:
1093 sb->s_flags = old_sb_flags;
Ryusuke Konishi06df0f92010-12-27 00:04:06 +09001094 sbi->s_mount_opt = old_mount_opt;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001095 return err;
1096}
1097
1098struct nilfs_super_data {
1099 struct block_device *bdev;
Ryusuke Konishi6dd47402009-06-08 01:39:31 +09001100 struct nilfs_sb_info *sbi;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001101 __u64 cno;
1102 int flags;
1103};
1104
1105/**
1106 * nilfs_identify - pre-read mount options needed to identify mount instance
1107 * @data: mount options
1108 * @sd: nilfs_super_data
1109 */
1110static int nilfs_identify(char *data, struct nilfs_super_data *sd)
1111{
1112 char *p, *options = data;
1113 substring_t args[MAX_OPT_ARGS];
Ryusuke Konishic05dbfc2010-09-16 00:36:24 +09001114 int token;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001115 int ret = 0;
1116
1117 do {
1118 p = strsep(&options, ",");
1119 if (p != NULL && *p) {
1120 token = match_token(p, tokens, args);
1121 if (token == Opt_snapshot) {
Ryusuke Konishic05dbfc2010-09-16 00:36:24 +09001122 if (!(sd->flags & MS_RDONLY)) {
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001123 ret++;
Ryusuke Konishic05dbfc2010-09-16 00:36:24 +09001124 } else {
1125 sd->cno = simple_strtoull(args[0].from,
1126 NULL, 0);
1127 /*
1128 * No need to see the end pointer;
1129 * match_token() has done syntax
1130 * checking.
1131 */
1132 if (sd->cno == 0)
1133 ret++;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001134 }
1135 }
1136 if (ret)
1137 printk(KERN_ERR
1138 "NILFS: invalid mount option: %s\n", p);
1139 }
1140 if (!options)
1141 break;
1142 BUG_ON(options == data);
1143 *(options - 1) = ',';
1144 } while (!ret);
1145 return ret;
1146}
1147
1148static int nilfs_set_bdev_super(struct super_block *s, void *data)
1149{
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001150 s->s_bdev = data;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001151 s->s_dev = s->s_bdev->bd_dev;
1152 return 0;
1153}
1154
1155static int nilfs_test_bdev_super(struct super_block *s, void *data)
1156{
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001157 return (void *)s->s_bdev == data;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001158}
1159
Al Viroe4c59d62010-07-26 12:19:34 +04001160static struct dentry *
1161nilfs_mount(struct file_system_type *fs_type, int flags,
1162 const char *dev_name, void *data)
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001163{
1164 struct nilfs_super_data sd;
Ryusuke Konishi33c8e572009-06-08 01:39:29 +09001165 struct super_block *s;
Tejun Heod4d77622010-11-13 11:55:18 +01001166 fmode_t mode = FMODE_READ | FMODE_EXCL;
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001167 struct dentry *root_dentry;
1168 int err, s_new = false;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001169
Ryusuke Konishi13e90552010-05-09 02:57:57 +09001170 if (!(flags & MS_RDONLY))
1171 mode |= FMODE_WRITE;
1172
Tejun Heod4d77622010-11-13 11:55:18 +01001173 sd.bdev = blkdev_get_by_path(dev_name, mode, fs_type);
Jan Blunckd6d4c192010-02-24 13:25:32 +01001174 if (IS_ERR(sd.bdev))
Al Viroe4c59d62010-07-26 12:19:34 +04001175 return ERR_CAST(sd.bdev);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001176
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001177 sd.cno = 0;
1178 sd.flags = flags;
1179 if (nilfs_identify((char *)data, &sd)) {
1180 err = -EINVAL;
1181 goto failed;
1182 }
1183
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +09001184 /*
1185 * once the super is inserted into the list by sget, s_umount
1186 * will protect the lockfs code from trying to start a snapshot
1187 * while we are mounting
1188 */
1189 mutex_lock(&sd.bdev->bd_fsfreeze_mutex);
1190 if (sd.bdev->bd_fsfreeze_count > 0) {
1191 mutex_unlock(&sd.bdev->bd_fsfreeze_mutex);
1192 err = -EBUSY;
Ryusuke Konishi33c8e572009-06-08 01:39:29 +09001193 goto failed;
1194 }
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001195 s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, sd.bdev);
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +09001196 mutex_unlock(&sd.bdev->bd_fsfreeze_mutex);
Ryusuke Konishi33c8e572009-06-08 01:39:29 +09001197 if (IS_ERR(s)) {
1198 err = PTR_ERR(s);
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001199 goto failed;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001200 }
1201
1202 if (!s->s_root) {
1203 char b[BDEVNAME_SIZE];
1204
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001205 s_new = true;
1206
Ryusuke Konishi33c8e572009-06-08 01:39:29 +09001207 /* New superblock instance created */
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001208 s->s_flags = flags;
Ryusuke Konishi4571b822010-05-09 03:01:32 +09001209 s->s_mode = mode;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001210 strlcpy(s->s_id, bdevname(sd.bdev, b), sizeof(s->s_id));
1211 sb_set_blocksize(s, block_size(sd.bdev));
1212
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001213 err = nilfs_fill_super(s, data, flags & MS_SILENT ? 1 : 0);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001214 if (err)
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001215 goto failed_super;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001216
1217 s->s_flags |= MS_ACTIVE;
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001218 } else if (!sd.cno) {
1219 int busy = false;
1220
1221 if (nilfs_tree_was_touched(s->s_root)) {
1222 busy = nilfs_try_to_shrink_tree(s->s_root);
1223 if (busy && (flags ^ s->s_flags) & MS_RDONLY) {
1224 printk(KERN_ERR "NILFS: the device already "
1225 "has a %s mount.\n",
1226 (s->s_flags & MS_RDONLY) ?
1227 "read-only" : "read/write");
1228 err = -EBUSY;
1229 goto failed_super;
1230 }
1231 }
1232 if (!busy) {
1233 /*
1234 * Try remount to setup mount states if the current
1235 * tree is not mounted and only snapshots use this sb.
1236 */
1237 err = nilfs_remount(s, &flags, data);
1238 if (err)
1239 goto failed_super;
1240 }
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001241 }
1242
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001243 if (sd.cno) {
1244 err = nilfs_attach_snapshot(s, sd.cno, &root_dentry);
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001245 if (err)
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001246 goto failed_super;
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001247 } else {
1248 root_dentry = dget(s->s_root);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001249 }
1250
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001251 if (!s_new)
Tejun Heod4d77622010-11-13 11:55:18 +01001252 blkdev_put(sd.bdev, mode);
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001253
Al Viroe4c59d62010-07-26 12:19:34 +04001254 return root_dentry;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001255
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001256 failed_super:
Al Viroa95161a2009-08-09 00:52:02 +04001257 deactivate_locked_super(s);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001258
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001259 failed:
1260 if (!s_new)
Tejun Heod4d77622010-11-13 11:55:18 +01001261 blkdev_put(sd.bdev, mode);
Al Viroe4c59d62010-07-26 12:19:34 +04001262 return ERR_PTR(err);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001263}
1264
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001265struct file_system_type nilfs_fs_type = {
1266 .owner = THIS_MODULE,
1267 .name = "nilfs2",
Al Viroe4c59d62010-07-26 12:19:34 +04001268 .mount = nilfs_mount,
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001269 .kill_sb = kill_block_super,
1270 .fs_flags = FS_REQUIRES_DEV,
1271};
1272
Li Hong41c88bd2010-04-06 00:54:11 +08001273static void nilfs_inode_init_once(void *obj)
1274{
1275 struct nilfs_inode_info *ii = obj;
1276
1277 INIT_LIST_HEAD(&ii->i_dirty);
1278#ifdef CONFIG_NILFS_XATTR
1279 init_rwsem(&ii->xattr_sem);
1280#endif
1281 nilfs_btnode_cache_init_once(&ii->i_btnode_cache);
Ryusuke Konishi05d0e942010-07-10 20:52:09 +09001282 ii->i_bmap = &ii->i_bmap_data;
Li Hong41c88bd2010-04-06 00:54:11 +08001283 inode_init_once(&ii->vfs_inode);
1284}
1285
1286static void nilfs_segbuf_init_once(void *obj)
1287{
1288 memset(obj, 0, sizeof(struct nilfs_segment_buffer));
1289}
1290
1291static void nilfs_destroy_cachep(void)
1292{
Ryusuke Konishi84cb0992010-05-22 12:49:32 +09001293 if (nilfs_inode_cachep)
Li Hong41c88bd2010-04-06 00:54:11 +08001294 kmem_cache_destroy(nilfs_inode_cachep);
Ryusuke Konishi84cb0992010-05-22 12:49:32 +09001295 if (nilfs_transaction_cachep)
Li Hong41c88bd2010-04-06 00:54:11 +08001296 kmem_cache_destroy(nilfs_transaction_cachep);
Ryusuke Konishi84cb0992010-05-22 12:49:32 +09001297 if (nilfs_segbuf_cachep)
Li Hong41c88bd2010-04-06 00:54:11 +08001298 kmem_cache_destroy(nilfs_segbuf_cachep);
Ryusuke Konishi84cb0992010-05-22 12:49:32 +09001299 if (nilfs_btree_path_cache)
Li Hong41c88bd2010-04-06 00:54:11 +08001300 kmem_cache_destroy(nilfs_btree_path_cache);
1301}
1302
1303static int __init nilfs_init_cachep(void)
1304{
1305 nilfs_inode_cachep = kmem_cache_create("nilfs2_inode_cache",
1306 sizeof(struct nilfs_inode_info), 0,
1307 SLAB_RECLAIM_ACCOUNT, nilfs_inode_init_once);
1308 if (!nilfs_inode_cachep)
1309 goto fail;
1310
1311 nilfs_transaction_cachep = kmem_cache_create("nilfs2_transaction_cache",
1312 sizeof(struct nilfs_transaction_info), 0,
1313 SLAB_RECLAIM_ACCOUNT, NULL);
1314 if (!nilfs_transaction_cachep)
1315 goto fail;
1316
1317 nilfs_segbuf_cachep = kmem_cache_create("nilfs2_segbuf_cache",
1318 sizeof(struct nilfs_segment_buffer), 0,
1319 SLAB_RECLAIM_ACCOUNT, nilfs_segbuf_init_once);
1320 if (!nilfs_segbuf_cachep)
1321 goto fail;
1322
1323 nilfs_btree_path_cache = kmem_cache_create("nilfs2_btree_path_cache",
1324 sizeof(struct nilfs_btree_path) * NILFS_BTREE_LEVEL_MAX,
1325 0, 0, NULL);
1326 if (!nilfs_btree_path_cache)
1327 goto fail;
1328
1329 return 0;
1330
1331fail:
1332 nilfs_destroy_cachep();
1333 return -ENOMEM;
1334}
1335
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001336static int __init init_nilfs_fs(void)
1337{
1338 int err;
1339
Li Hong41c88bd2010-04-06 00:54:11 +08001340 err = nilfs_init_cachep();
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001341 if (err)
Li Hong41c88bd2010-04-06 00:54:11 +08001342 goto fail;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001343
1344 err = register_filesystem(&nilfs_fs_type);
1345 if (err)
Li Hong41c88bd2010-04-06 00:54:11 +08001346 goto free_cachep;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001347
Li Hong9f130262010-04-09 23:09:53 +08001348 printk(KERN_INFO "NILFS version 2 loaded\n");
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001349 return 0;
1350
Li Hong41c88bd2010-04-06 00:54:11 +08001351free_cachep:
1352 nilfs_destroy_cachep();
1353fail:
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001354 return err;
1355}
1356
1357static void __exit exit_nilfs_fs(void)
1358{
Li Hong41c88bd2010-04-06 00:54:11 +08001359 nilfs_destroy_cachep();
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001360 unregister_filesystem(&nilfs_fs_type);
1361}
1362
1363module_init(init_nilfs_fs)
1364module_exit(exit_nilfs_fs)