blob: 062cca065195ea7f430f45cf9259896be44be788 [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>
Ryusuke Konishi783f6182009-04-06 19:01:35 -070046#include <linux/crc32.h>
Ryusuke Konishi783f6182009-04-06 19:01:35 -070047#include <linux/vfs.h>
48#include <linux/writeback.h>
Jiro SEKIBAb58a2852009-06-24 20:06:34 +090049#include <linux/seq_file.h>
50#include <linux/mount.h>
Ryusuke Konishi783f6182009-04-06 19:01:35 -070051#include "nilfs.h"
Ryusuke Konishi8e656fd2010-08-27 00:23:02 +090052#include "export.h"
Ryusuke Konishi783f6182009-04-06 19:01:35 -070053#include "mdt.h"
54#include "alloc.h"
Ryusuke Konishi05d0e942010-07-10 20:52:09 +090055#include "btree.h"
56#include "btnode.h"
Ryusuke Konishi783f6182009-04-06 19:01:35 -070057#include "page.h"
58#include "cpfile.h"
59#include "ifile.h"
60#include "dat.h"
61#include "segment.h"
62#include "segbuf.h"
63
64MODULE_AUTHOR("NTT Corp.");
65MODULE_DESCRIPTION("A New Implementation of the Log-structured Filesystem "
66 "(NILFS)");
Ryusuke Konishi783f6182009-04-06 19:01:35 -070067MODULE_LICENSE("GPL");
68
Jiro SEKIBAabc0b502010-10-08 22:37:27 +090069static struct kmem_cache *nilfs_inode_cachep;
Li Hong41c88bd2010-04-06 00:54:11 +080070struct kmem_cache *nilfs_transaction_cachep;
71struct kmem_cache *nilfs_segbuf_cachep;
72struct kmem_cache *nilfs_btree_path_cache;
73
Ryusuke Konishif7545142011-03-09 11:05:08 +090074static int nilfs_setup_super(struct super_block *sb, int is_mount);
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
Ryusuke Konishif7545142011-03-09 11:05:08 +090077static void nilfs_set_error(struct super_block *sb)
Ryusuke Konishic8a11c82010-06-28 17:49:30 +090078{
Ryusuke Konishie3154e92011-03-09 11:05:08 +090079 struct the_nilfs *nilfs = sb->s_fs_info;
Jiro SEKIBAd26493b2010-06-28 17:49:32 +090080 struct nilfs_super_block **sbp;
Ryusuke Konishic8a11c82010-06-28 17:49:30 +090081
82 down_write(&nilfs->ns_sem);
83 if (!(nilfs->ns_mount_state & NILFS_ERROR_FS)) {
84 nilfs->ns_mount_state |= NILFS_ERROR_FS;
Ryusuke Konishif7545142011-03-09 11:05:08 +090085 sbp = nilfs_prepare_super(sb, 0);
Jiro SEKIBAd26493b2010-06-28 17:49:32 +090086 if (likely(sbp)) {
87 sbp[0]->s_state |= cpu_to_le16(NILFS_ERROR_FS);
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +090088 if (sbp[1])
89 sbp[1]->s_state |= cpu_to_le16(NILFS_ERROR_FS);
Ryusuke Konishif7545142011-03-09 11:05:08 +090090 nilfs_commit_super(sb, NILFS_SB_COMMIT_ALL);
Jiro SEKIBAd26493b2010-06-28 17:49:32 +090091 }
Ryusuke Konishic8a11c82010-06-28 17:49:30 +090092 }
93 up_write(&nilfs->ns_sem);
94}
95
Ryusuke Konishi783f6182009-04-06 19:01:35 -070096/**
97 * nilfs_error() - report failure condition on a filesystem
98 *
99 * nilfs_error() sets an ERROR_FS flag on the superblock as well as
100 * reporting an error message. It should be called when NILFS detects
101 * incoherences or defects of meta data on disk. As for sustainable
102 * errors such as a single-shot I/O error, nilfs_warning() or the printk()
103 * function should be used instead.
104 *
105 * The segment constructor must not call this function because it can
106 * kill itself.
107 */
108void nilfs_error(struct super_block *sb, const char *function,
109 const char *fmt, ...)
110{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900111 struct the_nilfs *nilfs = sb->s_fs_info;
Joe Perchesb004a5e2010-11-09 16:35:21 -0800112 struct va_format vaf;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700113 va_list args;
114
115 va_start(args, fmt);
Joe Perchesb004a5e2010-11-09 16:35:21 -0800116
117 vaf.fmt = fmt;
118 vaf.va = &args;
119
120 printk(KERN_CRIT "NILFS error (device %s): %s: %pV\n",
121 sb->s_id, function, &vaf);
122
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700123 va_end(args);
124
125 if (!(sb->s_flags & MS_RDONLY)) {
Ryusuke Konishif7545142011-03-09 11:05:08 +0900126 nilfs_set_error(sb);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700127
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900128 if (nilfs_test_opt(nilfs, ERRORS_RO)) {
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700129 printk(KERN_CRIT "Remounting filesystem read-only\n");
130 sb->s_flags |= MS_RDONLY;
131 }
132 }
133
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900134 if (nilfs_test_opt(nilfs, ERRORS_PANIC))
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700135 panic("NILFS (device %s): panic forced after error\n",
136 sb->s_id);
137}
138
139void nilfs_warning(struct super_block *sb, const char *function,
140 const char *fmt, ...)
141{
Joe Perchesb004a5e2010-11-09 16:35:21 -0800142 struct va_format vaf;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700143 va_list args;
144
145 va_start(args, fmt);
Joe Perchesb004a5e2010-11-09 16:35:21 -0800146
147 vaf.fmt = fmt;
148 vaf.va = &args;
149
150 printk(KERN_WARNING "NILFS warning (device %s): %s: %pV\n",
151 sb->s_id, function, &vaf);
152
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700153 va_end(args);
154}
155
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700156
Ryusuke Konishi2879ed62010-09-05 13:35:53 +0900157struct inode *nilfs_alloc_inode(struct super_block *sb)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700158{
159 struct nilfs_inode_info *ii;
160
161 ii = kmem_cache_alloc(nilfs_inode_cachep, GFP_NOFS);
162 if (!ii)
163 return NULL;
164 ii->i_bh = NULL;
165 ii->i_state = 0;
Ryusuke Konishi0e14a352010-08-20 21:20:29 +0900166 ii->i_cno = 0;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700167 ii->vfs_inode.i_version = 1;
Ryusuke Konishi2879ed62010-09-05 13:35:53 +0900168 nilfs_btnode_cache_init(&ii->i_btnode_cache, sb->s_bdi);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700169 return &ii->vfs_inode;
170}
171
Nick Pigginfa0d7e32011-01-07 17:49:49 +1100172static void nilfs_i_callback(struct rcu_head *head)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700173{
Nick Pigginfa0d7e32011-01-07 17:49:49 +1100174 struct inode *inode = container_of(head, struct inode, i_rcu);
Ryusuke Konishib91c9a92010-08-20 23:46:06 +0900175 struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
176
Nick Pigginfa0d7e32011-01-07 17:49:49 +1100177 INIT_LIST_HEAD(&inode->i_dentry);
178
Ryusuke Konishib91c9a92010-08-20 23:46:06 +0900179 if (mdi) {
180 kfree(mdi->mi_bgl); /* kfree(NULL) is safe */
181 kfree(mdi);
182 }
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700183 kmem_cache_free(nilfs_inode_cachep, NILFS_I(inode));
184}
185
Nick Pigginfa0d7e32011-01-07 17:49:49 +1100186void nilfs_destroy_inode(struct inode *inode)
187{
188 call_rcu(&inode->i_rcu, nilfs_i_callback);
189}
190
Ryusuke Konishif7545142011-03-09 11:05:08 +0900191static int nilfs_sync_super(struct super_block *sb, int flag)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700192{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900193 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700194 int err;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700195
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700196 retry:
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700197 set_buffer_dirty(nilfs->ns_sbh[0]);
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900198 if (nilfs_test_opt(nilfs, BARRIER)) {
Christoph Hellwig87e99512010-08-11 17:05:45 +0200199 err = __sync_dirty_buffer(nilfs->ns_sbh[0],
Christoph Hellwigf8c131f2010-08-18 05:29:15 -0400200 WRITE_SYNC | WRITE_FLUSH_FUA);
Christoph Hellwig87e99512010-08-11 17:05:45 +0200201 } else {
202 err = sync_dirty_buffer(nilfs->ns_sbh[0]);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700203 }
Christoph Hellwig87e99512010-08-11 17:05:45 +0200204
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700205 if (unlikely(err)) {
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700206 printk(KERN_ERR
207 "NILFS: unable to write superblock (err=%d)\n", err);
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700208 if (err == -EIO && nilfs->ns_sbh[1]) {
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900209 /*
210 * sbp[0] points to newer log than sbp[1],
211 * so copy sbp[0] to sbp[1] to take over sbp[0].
212 */
213 memcpy(nilfs->ns_sbp[1], nilfs->ns_sbp[0],
214 nilfs->ns_sbsize);
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700215 nilfs_fall_back_super_block(nilfs);
216 goto retry;
217 }
218 } else {
219 struct nilfs_super_block *sbp = nilfs->ns_sbp[0];
220
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900221 nilfs->ns_sbwcount++;
222
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700223 /*
224 * The latest segment becomes trailable from the position
225 * written in superblock.
226 */
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700227 clear_nilfs_discontinued(nilfs);
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700228
229 /* update GC protection for recent segments */
230 if (nilfs->ns_sbh[1]) {
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900231 if (flag == NILFS_SB_COMMIT_ALL) {
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700232 set_buffer_dirty(nilfs->ns_sbh[1]);
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900233 if (sync_dirty_buffer(nilfs->ns_sbh[1]) < 0)
234 goto out;
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700235 }
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900236 if (le64_to_cpu(nilfs->ns_sbp[1]->s_last_cno) <
237 le64_to_cpu(nilfs->ns_sbp[0]->s_last_cno))
238 sbp = nilfs->ns_sbp[1];
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700239 }
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700240
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900241 spin_lock(&nilfs->ns_last_segment_lock);
242 nilfs->ns_prot_seq = le64_to_cpu(sbp->s_last_seq);
243 spin_unlock(&nilfs->ns_last_segment_lock);
244 }
245 out:
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700246 return err;
247}
248
Ryusuke Konishi60f46b72010-06-28 17:49:31 +0900249void nilfs_set_log_cursor(struct nilfs_super_block *sbp,
250 struct the_nilfs *nilfs)
251{
252 sector_t nfreeblocks;
253
254 /* nilfs->ns_sem must be locked by the caller. */
255 nilfs_count_free_blocks(nilfs, &nfreeblocks);
256 sbp->s_free_blocks_count = cpu_to_le64(nfreeblocks);
257
258 spin_lock(&nilfs->ns_last_segment_lock);
259 sbp->s_last_seq = cpu_to_le64(nilfs->ns_last_seq);
260 sbp->s_last_pseg = cpu_to_le64(nilfs->ns_last_pseg);
261 sbp->s_last_cno = cpu_to_le64(nilfs->ns_last_cno);
262 spin_unlock(&nilfs->ns_last_segment_lock);
263}
264
Ryusuke Konishif7545142011-03-09 11:05:08 +0900265struct nilfs_super_block **nilfs_prepare_super(struct super_block *sb,
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900266 int flip)
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900267{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900268 struct the_nilfs *nilfs = sb->s_fs_info;
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900269 struct nilfs_super_block **sbp = nilfs->ns_sbp;
270
271 /* nilfs->ns_sem must be locked by the caller. */
272 if (sbp[0]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) {
273 if (sbp[1] &&
274 sbp[1]->s_magic == cpu_to_le16(NILFS_SUPER_MAGIC)) {
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900275 memcpy(sbp[0], sbp[1], nilfs->ns_sbsize);
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900276 } else {
277 printk(KERN_CRIT "NILFS: superblock broke on dev %s\n",
Ryusuke Konishif7545142011-03-09 11:05:08 +0900278 sb->s_id);
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900279 return NULL;
280 }
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900281 } else if (sbp[1] &&
282 sbp[1]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) {
283 memcpy(sbp[1], sbp[0], nilfs->ns_sbsize);
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900284 }
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900285
286 if (flip && sbp[1])
287 nilfs_swap_super_block(nilfs);
288
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900289 return sbp;
290}
291
Ryusuke Konishif7545142011-03-09 11:05:08 +0900292int nilfs_commit_super(struct super_block *sb, int flag)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700293{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900294 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700295 struct nilfs_super_block **sbp = nilfs->ns_sbp;
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700296 time_t t;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700297
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900298 /* nilfs->ns_sem must be locked by the caller. */
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700299 t = get_seconds();
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900300 nilfs->ns_sbwtime = t;
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700301 sbp[0]->s_wtime = cpu_to_le64(t);
302 sbp[0]->s_sum = 0;
303 sbp[0]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed,
304 (unsigned char *)sbp[0],
305 nilfs->ns_sbsize));
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900306 if (flag == NILFS_SB_COMMIT_ALL && sbp[1]) {
307 sbp[1]->s_wtime = sbp[0]->s_wtime;
308 sbp[1]->s_sum = 0;
309 sbp[1]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed,
310 (unsigned char *)sbp[1],
311 nilfs->ns_sbsize));
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700312 }
Ryusuke Konishie605f0a2009-12-09 00:57:52 +0900313 clear_nilfs_sb_dirty(nilfs);
Ryusuke Konishif7545142011-03-09 11:05:08 +0900314 return nilfs_sync_super(sb, flag);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700315}
316
Ryusuke Konishi7ecaa462010-06-28 17:49:29 +0900317/**
318 * nilfs_cleanup_super() - write filesystem state for cleanup
Ryusuke Konishif7545142011-03-09 11:05:08 +0900319 * @sb: super block instance to be unmounted or degraded to read-only
Ryusuke Konishi7ecaa462010-06-28 17:49:29 +0900320 *
321 * This function restores state flags in the on-disk super block.
322 * This will set "clean" flag (i.e. NILFS_VALID_FS) unless the
323 * filesystem was not clean previously.
324 */
Ryusuke Konishif7545142011-03-09 11:05:08 +0900325int nilfs_cleanup_super(struct super_block *sb)
Ryusuke Konishi7ecaa462010-06-28 17:49:29 +0900326{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900327 struct the_nilfs *nilfs = sb->s_fs_info;
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
Ryusuke Konishif7545142011-03-09 11:05:08 +0900332 sbp = nilfs_prepare_super(sb, 0);
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900333 if (sbp) {
Ryusuke Konishif7545142011-03-09 11:05:08 +0900334 sbp[0]->s_state = cpu_to_le16(nilfs->ns_mount_state);
335 nilfs_set_log_cursor(sbp[0], nilfs);
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900336 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 }
Ryusuke Konishif7545142011-03-09 11:05:08 +0900345 ret = nilfs_commit_super(sb, 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{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900352 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700353
Ryusuke Konishif7545142011-03-09 11:05:08 +0900354 nilfs_detach_log_writer(sb);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700355
356 if (!(sb->s_flags & MS_RDONLY)) {
357 down_write(&nilfs->ns_sem);
Ryusuke Konishif7545142011-03-09 11:05:08 +0900358 nilfs_cleanup_super(sb);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700359 up_write(&nilfs->ns_sem);
360 }
361
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900362 iput(nilfs->ns_sufile);
363 iput(nilfs->ns_cpfile);
364 iput(nilfs->ns_dat);
365
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +0900366 destroy_nilfs(nilfs);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700367 sb->s_fs_info = NULL;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700368}
369
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700370static int nilfs_sync_fs(struct super_block *sb, int wait)
371{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900372 struct the_nilfs *nilfs = sb->s_fs_info;
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900373 struct nilfs_super_block **sbp;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700374 int err = 0;
375
376 /* This function is called when super block should be written back */
377 if (wait)
378 err = nilfs_construct_segment(sb);
Jiro SEKIBA6233caa2009-07-23 01:26:33 +0900379
380 down_write(&nilfs->ns_sem);
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900381 if (nilfs_sb_dirty(nilfs)) {
Ryusuke Konishif7545142011-03-09 11:05:08 +0900382 sbp = nilfs_prepare_super(sb, nilfs_sb_will_flip(nilfs));
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900383 if (likely(sbp)) {
384 nilfs_set_log_cursor(sbp[0], nilfs);
Ryusuke Konishif7545142011-03-09 11:05:08 +0900385 nilfs_commit_super(sb, NILFS_SB_COMMIT);
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900386 }
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900387 }
Jiro SEKIBA6233caa2009-07-23 01:26:33 +0900388 up_write(&nilfs->ns_sem);
389
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700390 return err;
391}
392
Ryusuke Konishif7545142011-03-09 11:05:08 +0900393int nilfs_attach_checkpoint(struct super_block *sb, __u64 cno, int curr_mnt,
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900394 struct nilfs_root **rootp)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700395{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900396 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900397 struct nilfs_root *root;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700398 struct nilfs_checkpoint *raw_cp;
399 struct buffer_head *bh_cp;
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900400 int err = -ENOMEM;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700401
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900402 root = nilfs_find_or_create_root(
403 nilfs, curr_mnt ? NILFS_CPTREE_CURRENT_CNO : cno);
404 if (!root)
405 return err;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700406
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900407 if (root->ifile)
408 goto reuse; /* already attached checkpoint */
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700409
Zhang Qiang1154ecb2009-08-18 14:58:24 +0800410 down_read(&nilfs->ns_segctor_sem);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700411 err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, cno, 0, &raw_cp,
412 &bh_cp);
Zhang Qiang1154ecb2009-08-18 14:58:24 +0800413 up_read(&nilfs->ns_segctor_sem);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700414 if (unlikely(err)) {
415 if (err == -ENOENT || err == -EINVAL) {
416 printk(KERN_ERR
417 "NILFS: Invalid checkpoint "
418 "(checkpoint number=%llu)\n",
419 (unsigned long long)cno);
420 err = -EINVAL;
421 }
422 goto failed;
423 }
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900424
Ryusuke Konishif7545142011-03-09 11:05:08 +0900425 err = nilfs_ifile_read(sb, root, nilfs->ns_inode_size,
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900426 &raw_cp->cp_ifile_inode, &root->ifile);
427 if (err)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700428 goto failed_bh;
Ryusuke Konishib7c06342010-08-14 14:48:32 +0900429
430 atomic_set(&root->inodes_count, le64_to_cpu(raw_cp->cp_inodes_count));
431 atomic_set(&root->blocks_count, le64_to_cpu(raw_cp->cp_blocks_count));
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700432
433 nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp);
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900434
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900435 reuse:
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900436 *rootp = root;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700437 return 0;
438
439 failed_bh:
440 nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp);
441 failed:
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900442 nilfs_put_root(root);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700443
444 return err;
445}
446
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900447static int nilfs_freeze(struct super_block *sb)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700448{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900449 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900450 int err;
451
452 if (sb->s_flags & MS_RDONLY)
453 return 0;
454
455 /* Mark super block clean */
456 down_write(&nilfs->ns_sem);
Ryusuke Konishif7545142011-03-09 11:05:08 +0900457 err = nilfs_cleanup_super(sb);
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900458 up_write(&nilfs->ns_sem);
459 return err;
460}
461
462static int nilfs_unfreeze(struct super_block *sb)
463{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900464 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700465
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900466 if (sb->s_flags & MS_RDONLY)
467 return 0;
468
469 down_write(&nilfs->ns_sem);
Ryusuke Konishif7545142011-03-09 11:05:08 +0900470 nilfs_setup_super(sb, false);
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900471 up_write(&nilfs->ns_sem);
472 return 0;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700473}
474
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700475static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf)
476{
477 struct super_block *sb = dentry->d_sb;
Ryusuke Konishib7c06342010-08-14 14:48:32 +0900478 struct nilfs_root *root = NILFS_I(dentry->d_inode)->i_root;
479 struct the_nilfs *nilfs = root->nilfs;
Ryusuke Konishic306af22009-03-26 10:16:57 +0900480 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700481 unsigned long long blocks;
482 unsigned long overhead;
483 unsigned long nrsvblocks;
484 sector_t nfreeblocks;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700485 int err;
486
487 /*
488 * Compute all of the segment blocks
489 *
490 * The blocks before first segment and after last segment
491 * are excluded.
492 */
493 blocks = nilfs->ns_blocks_per_segment * nilfs->ns_nsegments
494 - nilfs->ns_first_data_block;
495 nrsvblocks = nilfs->ns_nrsvsegs * nilfs->ns_blocks_per_segment;
496
497 /*
498 * Compute the overhead
499 *
Ryusuke Konishi7a650042010-03-14 03:32:40 +0900500 * When distributing meta data blocks outside segment structure,
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700501 * We must count them as the overhead.
502 */
503 overhead = 0;
504
505 err = nilfs_count_free_blocks(nilfs, &nfreeblocks);
506 if (unlikely(err))
507 return err;
508
509 buf->f_type = NILFS_SUPER_MAGIC;
510 buf->f_bsize = sb->s_blocksize;
511 buf->f_blocks = blocks - overhead;
512 buf->f_bfree = nfreeblocks;
513 buf->f_bavail = (buf->f_bfree >= nrsvblocks) ?
514 (buf->f_bfree - nrsvblocks) : 0;
Ryusuke Konishib7c06342010-08-14 14:48:32 +0900515 buf->f_files = atomic_read(&root->inodes_count);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700516 buf->f_ffree = 0; /* nilfs_count_free_inodes(sb); */
517 buf->f_namelen = NILFS_NAME_LEN;
Ryusuke Konishic306af22009-03-26 10:16:57 +0900518 buf->f_fsid.val[0] = (u32)id;
519 buf->f_fsid.val[1] = (u32)(id >> 32);
520
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700521 return 0;
522}
523
Jiro SEKIBAb58a2852009-06-24 20:06:34 +0900524static int nilfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
525{
526 struct super_block *sb = vfs->mnt_sb;
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900527 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900528 struct nilfs_root *root = NILFS_I(vfs->mnt_root->d_inode)->i_root;
Jiro SEKIBAb58a2852009-06-24 20:06:34 +0900529
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900530 if (!nilfs_test_opt(nilfs, BARRIER))
Ryusuke Konishic6b4d572010-07-05 14:40:27 +0900531 seq_puts(seq, ",nobarrier");
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900532 if (root->cno != NILFS_CPTREE_CURRENT_CNO)
533 seq_printf(seq, ",cp=%llu", (unsigned long long)root->cno);
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900534 if (nilfs_test_opt(nilfs, ERRORS_PANIC))
Ryusuke Konishic6b4d572010-07-05 14:40:27 +0900535 seq_puts(seq, ",errors=panic");
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900536 if (nilfs_test_opt(nilfs, ERRORS_CONT))
Ryusuke Konishic6b4d572010-07-05 14:40:27 +0900537 seq_puts(seq, ",errors=continue");
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900538 if (nilfs_test_opt(nilfs, STRICT_ORDER))
Ryusuke Konishic6b4d572010-07-05 14:40:27 +0900539 seq_puts(seq, ",order=strict");
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900540 if (nilfs_test_opt(nilfs, NORECOVERY))
Ryusuke Konishic6b4d572010-07-05 14:40:27 +0900541 seq_puts(seq, ",norecovery");
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900542 if (nilfs_test_opt(nilfs, DISCARD))
Ryusuke Konishic6b4d572010-07-05 14:40:27 +0900543 seq_puts(seq, ",discard");
Jiro SEKIBAb58a2852009-06-24 20:06:34 +0900544
545 return 0;
546}
547
Alexey Dobriyanb87221d2009-09-21 17:01:09 -0700548static const struct super_operations nilfs_sops = {
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700549 .alloc_inode = nilfs_alloc_inode,
550 .destroy_inode = nilfs_destroy_inode,
551 .dirty_inode = nilfs_dirty_inode,
552 /* .write_inode = nilfs_write_inode, */
553 /* .put_inode = nilfs_put_inode, */
554 /* .drop_inode = nilfs_drop_inode, */
Al Viro6fd1e5c2010-06-07 11:55:00 -0400555 .evict_inode = nilfs_evict_inode,
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700556 .put_super = nilfs_put_super,
Jiro SEKIBA1dfa2712009-07-23 01:33:49 +0900557 /* .write_super = nilfs_write_super, */
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700558 .sync_fs = nilfs_sync_fs,
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900559 .freeze_fs = nilfs_freeze,
560 .unfreeze_fs = nilfs_unfreeze,
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700561 /* .write_super_lockfs */
562 /* .unlockfs */
563 .statfs = nilfs_statfs,
564 .remount_fs = nilfs_remount,
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700565 /* .umount_begin */
Jiro SEKIBAb58a2852009-06-24 20:06:34 +0900566 .show_options = nilfs_show_options
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700567};
568
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700569enum {
570 Opt_err_cont, Opt_err_panic, Opt_err_ro,
Ryusuke Konishi773bc4f2010-07-05 13:00:08 +0900571 Opt_barrier, Opt_nobarrier, Opt_snapshot, Opt_order, Opt_norecovery,
Ryusuke Konishi802d3172010-07-05 14:27:04 +0900572 Opt_discard, Opt_nodiscard, Opt_err,
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700573};
574
575static match_table_t tokens = {
576 {Opt_err_cont, "errors=continue"},
577 {Opt_err_panic, "errors=panic"},
578 {Opt_err_ro, "errors=remount-ro"},
Ryusuke Konishi773bc4f2010-07-05 13:00:08 +0900579 {Opt_barrier, "barrier"},
Jiro SEKIBA91f19532009-11-12 14:07:26 +0900580 {Opt_nobarrier, "nobarrier"},
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700581 {Opt_snapshot, "cp=%u"},
582 {Opt_order, "order=%s"},
Ryusuke Konishi02345762009-11-20 03:28:01 +0900583 {Opt_norecovery, "norecovery"},
Jiro SEKIBAe902ec92010-01-30 18:06:35 +0900584 {Opt_discard, "discard"},
Ryusuke Konishi802d3172010-07-05 14:27:04 +0900585 {Opt_nodiscard, "nodiscard"},
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700586 {Opt_err, NULL}
587};
588
Ryusuke Konishi7c017452010-07-05 20:08:33 +0900589static int parse_options(char *options, struct super_block *sb, int is_remount)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700590{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900591 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700592 char *p;
593 substring_t args[MAX_OPT_ARGS];
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700594
595 if (!options)
596 return 1;
597
598 while ((p = strsep(&options, ",")) != NULL) {
599 int token;
600 if (!*p)
601 continue;
602
603 token = match_token(p, tokens, args);
604 switch (token) {
Ryusuke Konishi773bc4f2010-07-05 13:00:08 +0900605 case Opt_barrier:
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900606 nilfs_set_opt(nilfs, BARRIER);
Ryusuke Konishi773bc4f2010-07-05 13:00:08 +0900607 break;
Jiro SEKIBA91f19532009-11-12 14:07:26 +0900608 case Opt_nobarrier:
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900609 nilfs_clear_opt(nilfs, BARRIER);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700610 break;
611 case Opt_order:
612 if (strcmp(args[0].from, "relaxed") == 0)
613 /* Ordered data semantics */
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900614 nilfs_clear_opt(nilfs, STRICT_ORDER);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700615 else if (strcmp(args[0].from, "strict") == 0)
616 /* Strict in-order semantics */
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900617 nilfs_set_opt(nilfs, STRICT_ORDER);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700618 else
619 return 0;
620 break;
621 case Opt_err_panic:
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900622 nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_PANIC);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700623 break;
624 case Opt_err_ro:
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900625 nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_RO);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700626 break;
627 case Opt_err_cont:
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900628 nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_CONT);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700629 break;
630 case Opt_snapshot:
Ryusuke Konishi7c017452010-07-05 20:08:33 +0900631 if (is_remount) {
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900632 printk(KERN_ERR
633 "NILFS: \"%s\" option is invalid "
634 "for remount.\n", p);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700635 return 0;
Ryusuke Konishi7c017452010-07-05 20:08:33 +0900636 }
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700637 break;
Ryusuke Konishi02345762009-11-20 03:28:01 +0900638 case Opt_norecovery:
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900639 nilfs_set_opt(nilfs, NORECOVERY);
Ryusuke Konishi02345762009-11-20 03:28:01 +0900640 break;
Jiro SEKIBAe902ec92010-01-30 18:06:35 +0900641 case Opt_discard:
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900642 nilfs_set_opt(nilfs, DISCARD);
Jiro SEKIBAe902ec92010-01-30 18:06:35 +0900643 break;
Ryusuke Konishi802d3172010-07-05 14:27:04 +0900644 case Opt_nodiscard:
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900645 nilfs_clear_opt(nilfs, DISCARD);
Ryusuke Konishi802d3172010-07-05 14:27:04 +0900646 break;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700647 default:
648 printk(KERN_ERR
649 "NILFS: Unrecognized mount option \"%s\"\n", p);
650 return 0;
651 }
652 }
653 return 1;
654}
655
656static inline void
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900657nilfs_set_default_options(struct super_block *sb,
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700658 struct nilfs_super_block *sbp)
659{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900660 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900661
662 nilfs->ns_mount_opt =
Ryusuke Konishi277a6a32010-04-02 18:02:33 +0900663 NILFS_MOUNT_ERRORS_RO | NILFS_MOUNT_BARRIER;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700664}
665
Ryusuke Konishif7545142011-03-09 11:05:08 +0900666static int nilfs_setup_super(struct super_block *sb, int is_mount)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700667{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900668 struct the_nilfs *nilfs = sb->s_fs_info;
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900669 struct nilfs_super_block **sbp;
670 int max_mnt_count;
671 int mnt_count;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700672
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900673 /* nilfs->ns_sem must be locked by the caller. */
Ryusuke Konishif7545142011-03-09 11:05:08 +0900674 sbp = nilfs_prepare_super(sb, 0);
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900675 if (!sbp)
676 return -EIO;
677
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900678 if (!is_mount)
679 goto skip_mount_setup;
680
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900681 max_mnt_count = le16_to_cpu(sbp[0]->s_max_mnt_count);
682 mnt_count = le16_to_cpu(sbp[0]->s_mnt_count);
683
Ryusuke Konishif50a4c82009-11-19 16:58:40 +0900684 if (nilfs->ns_mount_state & NILFS_ERROR_FS) {
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700685 printk(KERN_WARNING
686 "NILFS warning: mounting fs with errors\n");
687#if 0
688 } else if (max_mnt_count >= 0 && mnt_count >= max_mnt_count) {
689 printk(KERN_WARNING
690 "NILFS warning: maximal mount count reached\n");
691#endif
692 }
693 if (!max_mnt_count)
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900694 sbp[0]->s_max_mnt_count = cpu_to_le16(NILFS_DFL_MAX_MNT_COUNT);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700695
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900696 sbp[0]->s_mnt_count = cpu_to_le16(mnt_count + 1);
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900697 sbp[0]->s_mtime = cpu_to_le64(get_seconds());
698
699skip_mount_setup:
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900700 sbp[0]->s_state =
701 cpu_to_le16(le16_to_cpu(sbp[0]->s_state) & ~NILFS_VALID_FS);
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900702 /* synchronize sbp[1] with sbp[0] */
Ryusuke Konishi0ca7a5b2011-01-21 16:40:31 +0900703 if (sbp[1])
704 memcpy(sbp[1], sbp[0], nilfs->ns_sbsize);
Ryusuke Konishif7545142011-03-09 11:05:08 +0900705 return nilfs_commit_super(sb, NILFS_SB_COMMIT_ALL);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700706}
707
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700708struct nilfs_super_block *nilfs_read_super_block(struct super_block *sb,
709 u64 pos, int blocksize,
710 struct buffer_head **pbh)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700711{
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700712 unsigned long long sb_index = pos;
713 unsigned long offset;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700714
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700715 offset = do_div(sb_index, blocksize);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700716 *pbh = sb_bread(sb, sb_index);
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700717 if (!*pbh)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700718 return NULL;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700719 return (struct nilfs_super_block *)((char *)(*pbh)->b_data + offset);
720}
721
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700722int nilfs_store_magic_and_option(struct super_block *sb,
723 struct nilfs_super_block *sbp,
724 char *data)
725{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900726 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700727
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700728 sb->s_magic = le16_to_cpu(sbp->s_magic);
729
730 /* FS independent flags */
731#ifdef NILFS_ATIME_DISABLE
732 sb->s_flags |= MS_NOATIME;
733#endif
734
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900735 nilfs_set_default_options(sb, sbp);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700736
Ryusuke Konishi574e6c32011-03-09 11:05:07 +0900737 nilfs->ns_resuid = le16_to_cpu(sbp->s_def_resuid);
738 nilfs->ns_resgid = le16_to_cpu(sbp->s_def_resgid);
739 nilfs->ns_interval = le32_to_cpu(sbp->s_c_interval);
740 nilfs->ns_watermark = le32_to_cpu(sbp->s_c_block_max);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700741
Ryusuke Konishi7c017452010-07-05 20:08:33 +0900742 return !parse_options(data, sb, 0) ? -EINVAL : 0 ;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700743}
744
Ryusuke Konishic5ca48a2010-07-22 03:22:20 +0900745int nilfs_check_feature_compatibility(struct super_block *sb,
746 struct nilfs_super_block *sbp)
747{
748 __u64 features;
749
750 features = le64_to_cpu(sbp->s_feature_incompat) &
751 ~NILFS_FEATURE_INCOMPAT_SUPP;
752 if (features) {
753 printk(KERN_ERR "NILFS: couldn't mount because of unsupported "
754 "optional features (%llx)\n",
755 (unsigned long long)features);
756 return -EINVAL;
757 }
758 features = le64_to_cpu(sbp->s_feature_compat_ro) &
759 ~NILFS_FEATURE_COMPAT_RO_SUPP;
760 if (!(sb->s_flags & MS_RDONLY) && features) {
761 printk(KERN_ERR "NILFS: couldn't mount RDWR because of "
762 "unsupported optional features (%llx)\n",
763 (unsigned long long)features);
764 return -EINVAL;
765 }
766 return 0;
767}
768
Ryusuke Konishi367ea332010-08-26 01:52:51 +0900769static int nilfs_get_root_dentry(struct super_block *sb,
770 struct nilfs_root *root,
771 struct dentry **root_dentry)
772{
773 struct inode *inode;
774 struct dentry *dentry;
775 int ret = 0;
776
777 inode = nilfs_iget(sb, root, NILFS_ROOT_INO);
778 if (IS_ERR(inode)) {
779 printk(KERN_ERR "NILFS: get root inode failed\n");
780 ret = PTR_ERR(inode);
781 goto out;
782 }
783 if (!S_ISDIR(inode->i_mode) || !inode->i_blocks || !inode->i_size) {
784 iput(inode);
785 printk(KERN_ERR "NILFS: corrupt root inode.\n");
786 ret = -EINVAL;
787 goto out;
788 }
789
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900790 if (root->cno == NILFS_CPTREE_CURRENT_CNO) {
791 dentry = d_find_alias(inode);
792 if (!dentry) {
793 dentry = d_alloc_root(inode);
794 if (!dentry) {
795 iput(inode);
796 ret = -ENOMEM;
797 goto failed_dentry;
798 }
799 } else {
800 iput(inode);
801 }
802 } else {
803 dentry = d_obtain_alias(inode);
804 if (IS_ERR(dentry)) {
805 ret = PTR_ERR(dentry);
806 goto failed_dentry;
807 }
Ryusuke Konishi367ea332010-08-26 01:52:51 +0900808 }
809 *root_dentry = dentry;
810 out:
811 return ret;
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900812
813 failed_dentry:
814 printk(KERN_ERR "NILFS: get root dentry failed\n");
815 goto out;
Ryusuke Konishi367ea332010-08-26 01:52:51 +0900816}
817
Ryusuke Konishiab4d8f72010-08-26 02:15:41 +0900818static int nilfs_attach_snapshot(struct super_block *s, __u64 cno,
819 struct dentry **root_dentry)
820{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900821 struct the_nilfs *nilfs = s->s_fs_info;
Ryusuke Konishiab4d8f72010-08-26 02:15:41 +0900822 struct nilfs_root *root;
823 int ret;
824
825 down_read(&nilfs->ns_segctor_sem);
826 ret = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile, cno);
827 up_read(&nilfs->ns_segctor_sem);
828 if (ret < 0) {
829 ret = (ret == -ENOENT) ? -EINVAL : ret;
830 goto out;
831 } else if (!ret) {
832 printk(KERN_ERR "NILFS: The specified checkpoint is "
833 "not a snapshot (checkpoint number=%llu).\n",
834 (unsigned long long)cno);
835 ret = -EINVAL;
836 goto out;
837 }
838
Ryusuke Konishif7545142011-03-09 11:05:08 +0900839 ret = nilfs_attach_checkpoint(s, cno, false, &root);
Ryusuke Konishiab4d8f72010-08-26 02:15:41 +0900840 if (ret) {
841 printk(KERN_ERR "NILFS: error loading snapshot "
842 "(checkpoint number=%llu).\n",
843 (unsigned long long)cno);
844 goto out;
845 }
846 ret = nilfs_get_root_dentry(s, root, root_dentry);
847 nilfs_put_root(root);
848 out:
849 return ret;
850}
851
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900852static int nilfs_tree_was_touched(struct dentry *root_dentry)
853{
Nick Pigginb7ab39f2011-01-07 17:49:32 +1100854 return root_dentry->d_count > 1;
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900855}
856
857/**
858 * nilfs_try_to_shrink_tree() - try to shrink dentries of a checkpoint
859 * @root_dentry: root dentry of the tree to be shrunk
860 *
861 * This function returns true if the tree was in-use.
862 */
863static int nilfs_try_to_shrink_tree(struct dentry *root_dentry)
864{
865 if (have_submounts(root_dentry))
866 return true;
867 shrink_dcache_parent(root_dentry);
868 return nilfs_tree_was_touched(root_dentry);
869}
870
Ryusuke Konishi032dbb32010-09-13 11:16:34 +0900871int nilfs_checkpoint_is_mounted(struct super_block *sb, __u64 cno)
872{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900873 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi032dbb32010-09-13 11:16:34 +0900874 struct nilfs_root *root;
875 struct inode *inode;
876 struct dentry *dentry;
877 int ret;
878
879 if (cno < 0 || cno > nilfs->ns_cno)
880 return false;
881
882 if (cno >= nilfs_last_cno(nilfs))
883 return true; /* protect recent checkpoints */
884
885 ret = false;
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900886 root = nilfs_lookup_root(nilfs, cno);
Ryusuke Konishi032dbb32010-09-13 11:16:34 +0900887 if (root) {
888 inode = nilfs_ilookup(sb, root, NILFS_ROOT_INO);
889 if (inode) {
890 dentry = d_find_alias(inode);
891 if (dentry) {
892 if (nilfs_tree_was_touched(dentry))
893 ret = nilfs_try_to_shrink_tree(dentry);
894 dput(dentry);
895 }
896 iput(inode);
897 }
898 nilfs_put_root(root);
899 }
900 return ret;
901}
902
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700903/**
904 * nilfs_fill_super() - initialize a super block instance
905 * @sb: super_block
906 * @data: mount options
907 * @silent: silent mode flag
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700908 *
Ryusuke Konishiaa7dfb82009-06-08 01:39:33 +0900909 * This function is called exclusively by nilfs->ns_mount_mutex.
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700910 * So, the recovery process is protected from other simultaneous mounts.
911 */
912static int
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +0900913nilfs_fill_super(struct super_block *sb, void *data, int silent)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700914{
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +0900915 struct the_nilfs *nilfs;
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900916 struct nilfs_root *fsroot;
Ryusuke Konishi026a7d62010-10-07 14:19:48 +0900917 struct backing_dev_info *bdi;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700918 __u64 cno;
919 int err;
920
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900921 nilfs = alloc_nilfs(sb->s_bdev);
922 if (!nilfs)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700923 return -ENOMEM;
924
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900925 sb->s_fs_info = nilfs;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700926
Ryusuke Konishif7545142011-03-09 11:05:08 +0900927 err = init_nilfs(nilfs, sb, (char *)data);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700928 if (err)
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +0900929 goto failed_nilfs;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700930
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700931 sb->s_op = &nilfs_sops;
932 sb->s_export_op = &nilfs_export_ops;
933 sb->s_root = NULL;
Ryusuke Konishi61239232009-04-06 19:02:00 -0700934 sb->s_time_gran = 1;
Ryusuke Konishi026a7d62010-10-07 14:19:48 +0900935
936 bdi = sb->s_bdev->bd_inode->i_mapping->backing_dev_info;
937 sb->s_bdi = bdi ? : &default_backing_dev_info;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700938
Ryusuke Konishif7545142011-03-09 11:05:08 +0900939 err = load_nilfs(nilfs, sb);
Ryusuke Konishif50a4c82009-11-19 16:58:40 +0900940 if (err)
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +0900941 goto failed_nilfs;
Ryusuke Konishif50a4c82009-11-19 16:58:40 +0900942
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700943 cno = nilfs_last_cno(nilfs);
Ryusuke Konishif7545142011-03-09 11:05:08 +0900944 err = nilfs_attach_checkpoint(sb, cno, true, &fsroot);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700945 if (err) {
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900946 printk(KERN_ERR "NILFS: error loading last checkpoint "
947 "(checkpoint number=%llu).\n", (unsigned long long)cno);
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900948 goto failed_unload;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700949 }
950
951 if (!(sb->s_flags & MS_RDONLY)) {
Ryusuke Konishif7545142011-03-09 11:05:08 +0900952 err = nilfs_attach_log_writer(sb, fsroot);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700953 if (err)
954 goto failed_checkpoint;
955 }
956
Ryusuke Konishi367ea332010-08-26 01:52:51 +0900957 err = nilfs_get_root_dentry(sb, fsroot, &sb->s_root);
958 if (err)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700959 goto failed_segctor;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700960
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900961 nilfs_put_root(fsroot);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700962
963 if (!(sb->s_flags & MS_RDONLY)) {
964 down_write(&nilfs->ns_sem);
Ryusuke Konishif7545142011-03-09 11:05:08 +0900965 nilfs_setup_super(sb, true);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700966 up_write(&nilfs->ns_sem);
967 }
968
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700969 return 0;
970
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700971 failed_segctor:
Ryusuke Konishif7545142011-03-09 11:05:08 +0900972 nilfs_detach_log_writer(sb);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700973
974 failed_checkpoint:
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900975 nilfs_put_root(fsroot);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700976
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900977 failed_unload:
978 iput(nilfs->ns_sufile);
979 iput(nilfs->ns_cpfile);
980 iput(nilfs->ns_dat);
981
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +0900982 failed_nilfs:
983 destroy_nilfs(nilfs);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700984 return err;
985}
986
987static int nilfs_remount(struct super_block *sb, int *flags, char *data)
988{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900989 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700990 unsigned long old_sb_flags;
Ryusuke Konishi06df0f92010-12-27 00:04:06 +0900991 unsigned long old_mount_opt;
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900992 int err;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700993
994 old_sb_flags = sb->s_flags;
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900995 old_mount_opt = nilfs->ns_mount_opt;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700996
Ryusuke Konishi7c017452010-07-05 20:08:33 +0900997 if (!parse_options(data, sb, 1)) {
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700998 err = -EINVAL;
999 goto restore_opts;
1000 }
1001 sb->s_flags = (sb->s_flags & ~MS_POSIXACL);
1002
Ryusuke Konishid240e062010-05-09 21:51:53 +09001003 err = -EINVAL;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001004
Ryusuke Konishi02345762009-11-20 03:28:01 +09001005 if (!nilfs_valid_fs(nilfs)) {
1006 printk(KERN_WARNING "NILFS (device %s): couldn't "
1007 "remount because the filesystem is in an "
1008 "incomplete recovery state.\n", sb->s_id);
Ryusuke Konishi02345762009-11-20 03:28:01 +09001009 goto restore_opts;
1010 }
1011
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001012 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
1013 goto out;
1014 if (*flags & MS_RDONLY) {
Ryusuke Konishif7545142011-03-09 11:05:08 +09001015 /* Shutting down log writer */
1016 nilfs_detach_log_writer(sb);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001017 sb->s_flags |= MS_RDONLY;
1018
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001019 /*
1020 * Remounting a valid RW partition RDONLY, so set
1021 * the RDONLY flag and then mark the partition as valid again.
1022 */
1023 down_write(&nilfs->ns_sem);
Ryusuke Konishif7545142011-03-09 11:05:08 +09001024 nilfs_cleanup_super(sb);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001025 up_write(&nilfs->ns_sem);
1026 } else {
Ryusuke Konishic5ca48a2010-07-22 03:22:20 +09001027 __u64 features;
Ryusuke Konishie912a5b2010-08-14 13:07:15 +09001028 struct nilfs_root *root;
Ryusuke Konishic5ca48a2010-07-22 03:22:20 +09001029
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001030 /*
1031 * Mounting a RDONLY partition read-write, so reread and
1032 * store the current valid flag. (It may have been changed
1033 * by fsck since we originally mounted the partition.)
1034 */
Ryusuke Konishic5ca48a2010-07-22 03:22:20 +09001035 down_read(&nilfs->ns_sem);
1036 features = le64_to_cpu(nilfs->ns_sbp[0]->s_feature_compat_ro) &
1037 ~NILFS_FEATURE_COMPAT_RO_SUPP;
1038 up_read(&nilfs->ns_sem);
1039 if (features) {
1040 printk(KERN_WARNING "NILFS (device %s): couldn't "
1041 "remount RDWR because of unsupported optional "
1042 "features (%llx)\n",
1043 sb->s_id, (unsigned long long)features);
1044 err = -EROFS;
1045 goto restore_opts;
1046 }
1047
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001048 sb->s_flags &= ~MS_RDONLY;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001049
Ryusuke Konishie912a5b2010-08-14 13:07:15 +09001050 root = NILFS_I(sb->s_root->d_inode)->i_root;
Ryusuke Konishif7545142011-03-09 11:05:08 +09001051 err = nilfs_attach_log_writer(sb, root);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001052 if (err)
Ryusuke Konishie59399d2009-06-08 01:39:32 +09001053 goto restore_opts;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001054
1055 down_write(&nilfs->ns_sem);
Ryusuke Konishif7545142011-03-09 11:05:08 +09001056 nilfs_setup_super(sb, true);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001057 up_write(&nilfs->ns_sem);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001058 }
1059 out:
1060 return 0;
1061
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001062 restore_opts:
1063 sb->s_flags = old_sb_flags;
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +09001064 nilfs->ns_mount_opt = old_mount_opt;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001065 return err;
1066}
1067
1068struct nilfs_super_data {
1069 struct block_device *bdev;
1070 __u64 cno;
1071 int flags;
1072};
1073
1074/**
1075 * nilfs_identify - pre-read mount options needed to identify mount instance
1076 * @data: mount options
1077 * @sd: nilfs_super_data
1078 */
1079static int nilfs_identify(char *data, struct nilfs_super_data *sd)
1080{
1081 char *p, *options = data;
1082 substring_t args[MAX_OPT_ARGS];
Ryusuke Konishic05dbfc2010-09-16 00:36:24 +09001083 int token;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001084 int ret = 0;
1085
1086 do {
1087 p = strsep(&options, ",");
1088 if (p != NULL && *p) {
1089 token = match_token(p, tokens, args);
1090 if (token == Opt_snapshot) {
Ryusuke Konishic05dbfc2010-09-16 00:36:24 +09001091 if (!(sd->flags & MS_RDONLY)) {
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001092 ret++;
Ryusuke Konishic05dbfc2010-09-16 00:36:24 +09001093 } else {
1094 sd->cno = simple_strtoull(args[0].from,
1095 NULL, 0);
1096 /*
1097 * No need to see the end pointer;
1098 * match_token() has done syntax
1099 * checking.
1100 */
1101 if (sd->cno == 0)
1102 ret++;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001103 }
1104 }
1105 if (ret)
1106 printk(KERN_ERR
1107 "NILFS: invalid mount option: %s\n", p);
1108 }
1109 if (!options)
1110 break;
1111 BUG_ON(options == data);
1112 *(options - 1) = ',';
1113 } while (!ret);
1114 return ret;
1115}
1116
1117static int nilfs_set_bdev_super(struct super_block *s, void *data)
1118{
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001119 s->s_bdev = data;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001120 s->s_dev = s->s_bdev->bd_dev;
1121 return 0;
1122}
1123
1124static int nilfs_test_bdev_super(struct super_block *s, void *data)
1125{
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001126 return (void *)s->s_bdev == data;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001127}
1128
Al Viroe4c59d62010-07-26 12:19:34 +04001129static struct dentry *
1130nilfs_mount(struct file_system_type *fs_type, int flags,
1131 const char *dev_name, void *data)
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001132{
1133 struct nilfs_super_data sd;
Ryusuke Konishi33c8e572009-06-08 01:39:29 +09001134 struct super_block *s;
Tejun Heod4d77622010-11-13 11:55:18 +01001135 fmode_t mode = FMODE_READ | FMODE_EXCL;
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001136 struct dentry *root_dentry;
1137 int err, s_new = false;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001138
Ryusuke Konishi13e90552010-05-09 02:57:57 +09001139 if (!(flags & MS_RDONLY))
1140 mode |= FMODE_WRITE;
1141
Tejun Heod4d77622010-11-13 11:55:18 +01001142 sd.bdev = blkdev_get_by_path(dev_name, mode, fs_type);
Jan Blunckd6d4c192010-02-24 13:25:32 +01001143 if (IS_ERR(sd.bdev))
Al Viroe4c59d62010-07-26 12:19:34 +04001144 return ERR_CAST(sd.bdev);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001145
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001146 sd.cno = 0;
1147 sd.flags = flags;
1148 if (nilfs_identify((char *)data, &sd)) {
1149 err = -EINVAL;
1150 goto failed;
1151 }
1152
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +09001153 /*
1154 * once the super is inserted into the list by sget, s_umount
1155 * will protect the lockfs code from trying to start a snapshot
1156 * while we are mounting
1157 */
1158 mutex_lock(&sd.bdev->bd_fsfreeze_mutex);
1159 if (sd.bdev->bd_fsfreeze_count > 0) {
1160 mutex_unlock(&sd.bdev->bd_fsfreeze_mutex);
1161 err = -EBUSY;
Ryusuke Konishi33c8e572009-06-08 01:39:29 +09001162 goto failed;
1163 }
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001164 s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, sd.bdev);
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +09001165 mutex_unlock(&sd.bdev->bd_fsfreeze_mutex);
Ryusuke Konishi33c8e572009-06-08 01:39:29 +09001166 if (IS_ERR(s)) {
1167 err = PTR_ERR(s);
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001168 goto failed;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001169 }
1170
1171 if (!s->s_root) {
1172 char b[BDEVNAME_SIZE];
1173
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001174 s_new = true;
1175
Ryusuke Konishi33c8e572009-06-08 01:39:29 +09001176 /* New superblock instance created */
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001177 s->s_flags = flags;
Ryusuke Konishi4571b822010-05-09 03:01:32 +09001178 s->s_mode = mode;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001179 strlcpy(s->s_id, bdevname(sd.bdev, b), sizeof(s->s_id));
1180 sb_set_blocksize(s, block_size(sd.bdev));
1181
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001182 err = nilfs_fill_super(s, data, flags & MS_SILENT ? 1 : 0);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001183 if (err)
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001184 goto failed_super;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001185
1186 s->s_flags |= MS_ACTIVE;
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001187 } else if (!sd.cno) {
1188 int busy = false;
1189
1190 if (nilfs_tree_was_touched(s->s_root)) {
1191 busy = nilfs_try_to_shrink_tree(s->s_root);
1192 if (busy && (flags ^ s->s_flags) & MS_RDONLY) {
1193 printk(KERN_ERR "NILFS: the device already "
1194 "has a %s mount.\n",
1195 (s->s_flags & MS_RDONLY) ?
1196 "read-only" : "read/write");
1197 err = -EBUSY;
1198 goto failed_super;
1199 }
1200 }
1201 if (!busy) {
1202 /*
1203 * Try remount to setup mount states if the current
1204 * tree is not mounted and only snapshots use this sb.
1205 */
1206 err = nilfs_remount(s, &flags, data);
1207 if (err)
1208 goto failed_super;
1209 }
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001210 }
1211
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001212 if (sd.cno) {
1213 err = nilfs_attach_snapshot(s, sd.cno, &root_dentry);
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001214 if (err)
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001215 goto failed_super;
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001216 } else {
1217 root_dentry = dget(s->s_root);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001218 }
1219
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001220 if (!s_new)
Tejun Heod4d77622010-11-13 11:55:18 +01001221 blkdev_put(sd.bdev, mode);
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001222
Al Viroe4c59d62010-07-26 12:19:34 +04001223 return root_dentry;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001224
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001225 failed_super:
Al Viroa95161a2009-08-09 00:52:02 +04001226 deactivate_locked_super(s);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001227
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001228 failed:
1229 if (!s_new)
Tejun Heod4d77622010-11-13 11:55:18 +01001230 blkdev_put(sd.bdev, mode);
Al Viroe4c59d62010-07-26 12:19:34 +04001231 return ERR_PTR(err);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001232}
1233
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001234struct file_system_type nilfs_fs_type = {
1235 .owner = THIS_MODULE,
1236 .name = "nilfs2",
Al Viroe4c59d62010-07-26 12:19:34 +04001237 .mount = nilfs_mount,
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001238 .kill_sb = kill_block_super,
1239 .fs_flags = FS_REQUIRES_DEV,
1240};
1241
Li Hong41c88bd2010-04-06 00:54:11 +08001242static void nilfs_inode_init_once(void *obj)
1243{
1244 struct nilfs_inode_info *ii = obj;
1245
1246 INIT_LIST_HEAD(&ii->i_dirty);
1247#ifdef CONFIG_NILFS_XATTR
1248 init_rwsem(&ii->xattr_sem);
1249#endif
Miklos Szeredi2aa15892011-02-23 13:49:47 +01001250 address_space_init_once(&ii->i_btnode_cache);
Ryusuke Konishi05d0e942010-07-10 20:52:09 +09001251 ii->i_bmap = &ii->i_bmap_data;
Li Hong41c88bd2010-04-06 00:54:11 +08001252 inode_init_once(&ii->vfs_inode);
1253}
1254
1255static void nilfs_segbuf_init_once(void *obj)
1256{
1257 memset(obj, 0, sizeof(struct nilfs_segment_buffer));
1258}
1259
1260static void nilfs_destroy_cachep(void)
1261{
Ryusuke Konishi84cb0992010-05-22 12:49:32 +09001262 if (nilfs_inode_cachep)
Li Hong41c88bd2010-04-06 00:54:11 +08001263 kmem_cache_destroy(nilfs_inode_cachep);
Ryusuke Konishi84cb0992010-05-22 12:49:32 +09001264 if (nilfs_transaction_cachep)
Li Hong41c88bd2010-04-06 00:54:11 +08001265 kmem_cache_destroy(nilfs_transaction_cachep);
Ryusuke Konishi84cb0992010-05-22 12:49:32 +09001266 if (nilfs_segbuf_cachep)
Li Hong41c88bd2010-04-06 00:54:11 +08001267 kmem_cache_destroy(nilfs_segbuf_cachep);
Ryusuke Konishi84cb0992010-05-22 12:49:32 +09001268 if (nilfs_btree_path_cache)
Li Hong41c88bd2010-04-06 00:54:11 +08001269 kmem_cache_destroy(nilfs_btree_path_cache);
1270}
1271
1272static int __init nilfs_init_cachep(void)
1273{
1274 nilfs_inode_cachep = kmem_cache_create("nilfs2_inode_cache",
1275 sizeof(struct nilfs_inode_info), 0,
1276 SLAB_RECLAIM_ACCOUNT, nilfs_inode_init_once);
1277 if (!nilfs_inode_cachep)
1278 goto fail;
1279
1280 nilfs_transaction_cachep = kmem_cache_create("nilfs2_transaction_cache",
1281 sizeof(struct nilfs_transaction_info), 0,
1282 SLAB_RECLAIM_ACCOUNT, NULL);
1283 if (!nilfs_transaction_cachep)
1284 goto fail;
1285
1286 nilfs_segbuf_cachep = kmem_cache_create("nilfs2_segbuf_cache",
1287 sizeof(struct nilfs_segment_buffer), 0,
1288 SLAB_RECLAIM_ACCOUNT, nilfs_segbuf_init_once);
1289 if (!nilfs_segbuf_cachep)
1290 goto fail;
1291
1292 nilfs_btree_path_cache = kmem_cache_create("nilfs2_btree_path_cache",
1293 sizeof(struct nilfs_btree_path) * NILFS_BTREE_LEVEL_MAX,
1294 0, 0, NULL);
1295 if (!nilfs_btree_path_cache)
1296 goto fail;
1297
1298 return 0;
1299
1300fail:
1301 nilfs_destroy_cachep();
1302 return -ENOMEM;
1303}
1304
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001305static int __init init_nilfs_fs(void)
1306{
1307 int err;
1308
Li Hong41c88bd2010-04-06 00:54:11 +08001309 err = nilfs_init_cachep();
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001310 if (err)
Li Hong41c88bd2010-04-06 00:54:11 +08001311 goto fail;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001312
1313 err = register_filesystem(&nilfs_fs_type);
1314 if (err)
Li Hong41c88bd2010-04-06 00:54:11 +08001315 goto free_cachep;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001316
Li Hong9f130262010-04-09 23:09:53 +08001317 printk(KERN_INFO "NILFS version 2 loaded\n");
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001318 return 0;
1319
Li Hong41c88bd2010-04-06 00:54:11 +08001320free_cachep:
1321 nilfs_destroy_cachep();
1322fail:
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001323 return err;
1324}
1325
1326static void __exit exit_nilfs_fs(void)
1327{
Li Hong41c88bd2010-04-06 00:54:11 +08001328 nilfs_destroy_cachep();
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001329 unregister_filesystem(&nilfs_fs_type);
1330}
1331
1332module_init(init_nilfs_fs)
1333module_exit(exit_nilfs_fs)