blob: eba5b53b10809c5803cdb8f5d8926490e6993079 [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 Pigginfa0d7e3d2011-01-07 17:49:49 +1100172static void nilfs_i_callback(struct rcu_head *head)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700173{
Nick Pigginfa0d7e3d2011-01-07 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 Pigginfa0d7e3d2011-01-07 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 Pigginfa0d7e3d2011-01-07 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 Konishicfb0a4b2011-05-05 01:23:57 +0900350/**
351 * nilfs_move_2nd_super - relocate secondary super block
352 * @sb: super block instance
353 * @sb2off: new offset of the secondary super block (in bytes)
354 */
355static int nilfs_move_2nd_super(struct super_block *sb, loff_t sb2off)
356{
357 struct the_nilfs *nilfs = sb->s_fs_info;
358 struct buffer_head *nsbh;
359 struct nilfs_super_block *nsbp;
360 sector_t blocknr, newblocknr;
361 unsigned long offset;
362 int sb2i = -1; /* array index of the secondary superblock */
363 int ret = 0;
364
365 /* nilfs->ns_sem must be locked by the caller. */
366 if (nilfs->ns_sbh[1] &&
367 nilfs->ns_sbh[1]->b_blocknr > nilfs->ns_first_data_block) {
368 sb2i = 1;
369 blocknr = nilfs->ns_sbh[1]->b_blocknr;
370 } else if (nilfs->ns_sbh[0]->b_blocknr > nilfs->ns_first_data_block) {
371 sb2i = 0;
372 blocknr = nilfs->ns_sbh[0]->b_blocknr;
373 }
374 if (sb2i >= 0 && (u64)blocknr << nilfs->ns_blocksize_bits == sb2off)
375 goto out; /* super block location is unchanged */
376
377 /* Get new super block buffer */
378 newblocknr = sb2off >> nilfs->ns_blocksize_bits;
379 offset = sb2off & (nilfs->ns_blocksize - 1);
380 nsbh = sb_getblk(sb, newblocknr);
381 if (!nsbh) {
382 printk(KERN_WARNING
383 "NILFS warning: unable to move secondary superblock "
384 "to block %llu\n", (unsigned long long)newblocknr);
385 ret = -EIO;
386 goto out;
387 }
388 nsbp = (void *)nsbh->b_data + offset;
389 memset(nsbp, 0, nilfs->ns_blocksize);
390
391 if (sb2i >= 0) {
392 memcpy(nsbp, nilfs->ns_sbp[sb2i], nilfs->ns_sbsize);
393 brelse(nilfs->ns_sbh[sb2i]);
394 nilfs->ns_sbh[sb2i] = nsbh;
395 nilfs->ns_sbp[sb2i] = nsbp;
396 } else if (nilfs->ns_sbh[0]->b_blocknr < nilfs->ns_first_data_block) {
397 /* secondary super block will be restored to index 1 */
398 nilfs->ns_sbh[1] = nsbh;
399 nilfs->ns_sbp[1] = nsbp;
400 } else {
401 brelse(nsbh);
402 }
403out:
404 return ret;
405}
406
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700407static void nilfs_put_super(struct super_block *sb)
408{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900409 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700410
Ryusuke Konishif7545142011-03-09 11:05:08 +0900411 nilfs_detach_log_writer(sb);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700412
413 if (!(sb->s_flags & MS_RDONLY)) {
414 down_write(&nilfs->ns_sem);
Ryusuke Konishif7545142011-03-09 11:05:08 +0900415 nilfs_cleanup_super(sb);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700416 up_write(&nilfs->ns_sem);
417 }
418
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900419 iput(nilfs->ns_sufile);
420 iput(nilfs->ns_cpfile);
421 iput(nilfs->ns_dat);
422
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +0900423 destroy_nilfs(nilfs);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700424 sb->s_fs_info = NULL;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700425}
426
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700427static int nilfs_sync_fs(struct super_block *sb, int wait)
428{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900429 struct the_nilfs *nilfs = sb->s_fs_info;
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900430 struct nilfs_super_block **sbp;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700431 int err = 0;
432
433 /* This function is called when super block should be written back */
434 if (wait)
435 err = nilfs_construct_segment(sb);
Jiro SEKIBA6233caa2009-07-23 01:26:33 +0900436
437 down_write(&nilfs->ns_sem);
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900438 if (nilfs_sb_dirty(nilfs)) {
Ryusuke Konishif7545142011-03-09 11:05:08 +0900439 sbp = nilfs_prepare_super(sb, nilfs_sb_will_flip(nilfs));
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900440 if (likely(sbp)) {
441 nilfs_set_log_cursor(sbp[0], nilfs);
Ryusuke Konishif7545142011-03-09 11:05:08 +0900442 nilfs_commit_super(sb, NILFS_SB_COMMIT);
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900443 }
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900444 }
Jiro SEKIBA6233caa2009-07-23 01:26:33 +0900445 up_write(&nilfs->ns_sem);
446
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700447 return err;
448}
449
Ryusuke Konishif7545142011-03-09 11:05:08 +0900450int nilfs_attach_checkpoint(struct super_block *sb, __u64 cno, int curr_mnt,
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900451 struct nilfs_root **rootp)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700452{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900453 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900454 struct nilfs_root *root;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700455 struct nilfs_checkpoint *raw_cp;
456 struct buffer_head *bh_cp;
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900457 int err = -ENOMEM;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700458
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900459 root = nilfs_find_or_create_root(
460 nilfs, curr_mnt ? NILFS_CPTREE_CURRENT_CNO : cno);
461 if (!root)
462 return err;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700463
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900464 if (root->ifile)
465 goto reuse; /* already attached checkpoint */
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700466
Zhang Qiang1154ecb2009-08-18 14:58:24 +0800467 down_read(&nilfs->ns_segctor_sem);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700468 err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, cno, 0, &raw_cp,
469 &bh_cp);
Zhang Qiang1154ecb2009-08-18 14:58:24 +0800470 up_read(&nilfs->ns_segctor_sem);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700471 if (unlikely(err)) {
472 if (err == -ENOENT || err == -EINVAL) {
473 printk(KERN_ERR
474 "NILFS: Invalid checkpoint "
475 "(checkpoint number=%llu)\n",
476 (unsigned long long)cno);
477 err = -EINVAL;
478 }
479 goto failed;
480 }
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900481
Ryusuke Konishif7545142011-03-09 11:05:08 +0900482 err = nilfs_ifile_read(sb, root, nilfs->ns_inode_size,
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900483 &raw_cp->cp_ifile_inode, &root->ifile);
484 if (err)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700485 goto failed_bh;
Ryusuke Konishib7c06342010-08-14 14:48:32 +0900486
487 atomic_set(&root->inodes_count, le64_to_cpu(raw_cp->cp_inodes_count));
488 atomic_set(&root->blocks_count, le64_to_cpu(raw_cp->cp_blocks_count));
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700489
490 nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp);
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900491
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900492 reuse:
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900493 *rootp = root;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700494 return 0;
495
496 failed_bh:
497 nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp);
498 failed:
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900499 nilfs_put_root(root);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700500
501 return err;
502}
503
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900504static int nilfs_freeze(struct super_block *sb)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700505{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900506 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900507 int err;
508
509 if (sb->s_flags & MS_RDONLY)
510 return 0;
511
512 /* Mark super block clean */
513 down_write(&nilfs->ns_sem);
Ryusuke Konishif7545142011-03-09 11:05:08 +0900514 err = nilfs_cleanup_super(sb);
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900515 up_write(&nilfs->ns_sem);
516 return err;
517}
518
519static int nilfs_unfreeze(struct super_block *sb)
520{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900521 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700522
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900523 if (sb->s_flags & MS_RDONLY)
524 return 0;
525
526 down_write(&nilfs->ns_sem);
Ryusuke Konishif7545142011-03-09 11:05:08 +0900527 nilfs_setup_super(sb, false);
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900528 up_write(&nilfs->ns_sem);
529 return 0;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700530}
531
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700532static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf)
533{
534 struct super_block *sb = dentry->d_sb;
Ryusuke Konishib7c06342010-08-14 14:48:32 +0900535 struct nilfs_root *root = NILFS_I(dentry->d_inode)->i_root;
536 struct the_nilfs *nilfs = root->nilfs;
Ryusuke Konishic306af22009-03-26 10:16:57 +0900537 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700538 unsigned long long blocks;
539 unsigned long overhead;
540 unsigned long nrsvblocks;
541 sector_t nfreeblocks;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700542 int err;
543
544 /*
545 * Compute all of the segment blocks
546 *
547 * The blocks before first segment and after last segment
548 * are excluded.
549 */
550 blocks = nilfs->ns_blocks_per_segment * nilfs->ns_nsegments
551 - nilfs->ns_first_data_block;
552 nrsvblocks = nilfs->ns_nrsvsegs * nilfs->ns_blocks_per_segment;
553
554 /*
555 * Compute the overhead
556 *
Ryusuke Konishi7a650042010-03-14 03:32:40 +0900557 * When distributing meta data blocks outside segment structure,
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700558 * We must count them as the overhead.
559 */
560 overhead = 0;
561
562 err = nilfs_count_free_blocks(nilfs, &nfreeblocks);
563 if (unlikely(err))
564 return err;
565
566 buf->f_type = NILFS_SUPER_MAGIC;
567 buf->f_bsize = sb->s_blocksize;
568 buf->f_blocks = blocks - overhead;
569 buf->f_bfree = nfreeblocks;
570 buf->f_bavail = (buf->f_bfree >= nrsvblocks) ?
571 (buf->f_bfree - nrsvblocks) : 0;
Ryusuke Konishib7c06342010-08-14 14:48:32 +0900572 buf->f_files = atomic_read(&root->inodes_count);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700573 buf->f_ffree = 0; /* nilfs_count_free_inodes(sb); */
574 buf->f_namelen = NILFS_NAME_LEN;
Ryusuke Konishic306af22009-03-26 10:16:57 +0900575 buf->f_fsid.val[0] = (u32)id;
576 buf->f_fsid.val[1] = (u32)(id >> 32);
577
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700578 return 0;
579}
580
Jiro SEKIBAb58a2852009-06-24 20:06:34 +0900581static int nilfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
582{
583 struct super_block *sb = vfs->mnt_sb;
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900584 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900585 struct nilfs_root *root = NILFS_I(vfs->mnt_root->d_inode)->i_root;
Jiro SEKIBAb58a2852009-06-24 20:06:34 +0900586
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900587 if (!nilfs_test_opt(nilfs, BARRIER))
Ryusuke Konishic6b4d572010-07-05 14:40:27 +0900588 seq_puts(seq, ",nobarrier");
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900589 if (root->cno != NILFS_CPTREE_CURRENT_CNO)
590 seq_printf(seq, ",cp=%llu", (unsigned long long)root->cno);
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900591 if (nilfs_test_opt(nilfs, ERRORS_PANIC))
Ryusuke Konishic6b4d572010-07-05 14:40:27 +0900592 seq_puts(seq, ",errors=panic");
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900593 if (nilfs_test_opt(nilfs, ERRORS_CONT))
Ryusuke Konishic6b4d572010-07-05 14:40:27 +0900594 seq_puts(seq, ",errors=continue");
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900595 if (nilfs_test_opt(nilfs, STRICT_ORDER))
Ryusuke Konishic6b4d572010-07-05 14:40:27 +0900596 seq_puts(seq, ",order=strict");
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900597 if (nilfs_test_opt(nilfs, NORECOVERY))
Ryusuke Konishic6b4d572010-07-05 14:40:27 +0900598 seq_puts(seq, ",norecovery");
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900599 if (nilfs_test_opt(nilfs, DISCARD))
Ryusuke Konishic6b4d572010-07-05 14:40:27 +0900600 seq_puts(seq, ",discard");
Jiro SEKIBAb58a2852009-06-24 20:06:34 +0900601
602 return 0;
603}
604
Alexey Dobriyanb87221d2009-09-21 17:01:09 -0700605static const struct super_operations nilfs_sops = {
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700606 .alloc_inode = nilfs_alloc_inode,
607 .destroy_inode = nilfs_destroy_inode,
608 .dirty_inode = nilfs_dirty_inode,
609 /* .write_inode = nilfs_write_inode, */
610 /* .put_inode = nilfs_put_inode, */
611 /* .drop_inode = nilfs_drop_inode, */
Al Viro6fd1e5c2010-06-07 11:55:00 -0400612 .evict_inode = nilfs_evict_inode,
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700613 .put_super = nilfs_put_super,
Jiro SEKIBA1dfa2712009-07-23 01:33:49 +0900614 /* .write_super = nilfs_write_super, */
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700615 .sync_fs = nilfs_sync_fs,
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900616 .freeze_fs = nilfs_freeze,
617 .unfreeze_fs = nilfs_unfreeze,
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700618 /* .write_super_lockfs */
619 /* .unlockfs */
620 .statfs = nilfs_statfs,
621 .remount_fs = nilfs_remount,
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700622 /* .umount_begin */
Jiro SEKIBAb58a2852009-06-24 20:06:34 +0900623 .show_options = nilfs_show_options
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700624};
625
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700626enum {
627 Opt_err_cont, Opt_err_panic, Opt_err_ro,
Ryusuke Konishi773bc4f2010-07-05 13:00:08 +0900628 Opt_barrier, Opt_nobarrier, Opt_snapshot, Opt_order, Opt_norecovery,
Ryusuke Konishi802d3172010-07-05 14:27:04 +0900629 Opt_discard, Opt_nodiscard, Opt_err,
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700630};
631
632static match_table_t tokens = {
633 {Opt_err_cont, "errors=continue"},
634 {Opt_err_panic, "errors=panic"},
635 {Opt_err_ro, "errors=remount-ro"},
Ryusuke Konishi773bc4f2010-07-05 13:00:08 +0900636 {Opt_barrier, "barrier"},
Jiro SEKIBA91f19532009-11-12 14:07:26 +0900637 {Opt_nobarrier, "nobarrier"},
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700638 {Opt_snapshot, "cp=%u"},
639 {Opt_order, "order=%s"},
Ryusuke Konishi02345762009-11-20 03:28:01 +0900640 {Opt_norecovery, "norecovery"},
Jiro SEKIBAe902ec92010-01-30 18:06:35 +0900641 {Opt_discard, "discard"},
Ryusuke Konishi802d3172010-07-05 14:27:04 +0900642 {Opt_nodiscard, "nodiscard"},
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700643 {Opt_err, NULL}
644};
645
Ryusuke Konishi7c017452010-07-05 20:08:33 +0900646static int parse_options(char *options, struct super_block *sb, int is_remount)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700647{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900648 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700649 char *p;
650 substring_t args[MAX_OPT_ARGS];
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700651
652 if (!options)
653 return 1;
654
655 while ((p = strsep(&options, ",")) != NULL) {
656 int token;
657 if (!*p)
658 continue;
659
660 token = match_token(p, tokens, args);
661 switch (token) {
Ryusuke Konishi773bc4f2010-07-05 13:00:08 +0900662 case Opt_barrier:
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900663 nilfs_set_opt(nilfs, BARRIER);
Ryusuke Konishi773bc4f2010-07-05 13:00:08 +0900664 break;
Jiro SEKIBA91f19532009-11-12 14:07:26 +0900665 case Opt_nobarrier:
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900666 nilfs_clear_opt(nilfs, BARRIER);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700667 break;
668 case Opt_order:
669 if (strcmp(args[0].from, "relaxed") == 0)
670 /* Ordered data semantics */
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900671 nilfs_clear_opt(nilfs, STRICT_ORDER);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700672 else if (strcmp(args[0].from, "strict") == 0)
673 /* Strict in-order semantics */
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900674 nilfs_set_opt(nilfs, STRICT_ORDER);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700675 else
676 return 0;
677 break;
678 case Opt_err_panic:
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900679 nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_PANIC);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700680 break;
681 case Opt_err_ro:
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900682 nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_RO);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700683 break;
684 case Opt_err_cont:
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900685 nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_CONT);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700686 break;
687 case Opt_snapshot:
Ryusuke Konishi7c017452010-07-05 20:08:33 +0900688 if (is_remount) {
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900689 printk(KERN_ERR
690 "NILFS: \"%s\" option is invalid "
691 "for remount.\n", p);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700692 return 0;
Ryusuke Konishi7c017452010-07-05 20:08:33 +0900693 }
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700694 break;
Ryusuke Konishi02345762009-11-20 03:28:01 +0900695 case Opt_norecovery:
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900696 nilfs_set_opt(nilfs, NORECOVERY);
Ryusuke Konishi02345762009-11-20 03:28:01 +0900697 break;
Jiro SEKIBAe902ec92010-01-30 18:06:35 +0900698 case Opt_discard:
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900699 nilfs_set_opt(nilfs, DISCARD);
Jiro SEKIBAe902ec92010-01-30 18:06:35 +0900700 break;
Ryusuke Konishi802d3172010-07-05 14:27:04 +0900701 case Opt_nodiscard:
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900702 nilfs_clear_opt(nilfs, DISCARD);
Ryusuke Konishi802d3172010-07-05 14:27:04 +0900703 break;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700704 default:
705 printk(KERN_ERR
706 "NILFS: Unrecognized mount option \"%s\"\n", p);
707 return 0;
708 }
709 }
710 return 1;
711}
712
713static inline void
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900714nilfs_set_default_options(struct super_block *sb,
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700715 struct nilfs_super_block *sbp)
716{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900717 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900718
719 nilfs->ns_mount_opt =
Ryusuke Konishi277a6a32010-04-02 18:02:33 +0900720 NILFS_MOUNT_ERRORS_RO | NILFS_MOUNT_BARRIER;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700721}
722
Ryusuke Konishif7545142011-03-09 11:05:08 +0900723static int nilfs_setup_super(struct super_block *sb, int is_mount)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700724{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900725 struct the_nilfs *nilfs = sb->s_fs_info;
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900726 struct nilfs_super_block **sbp;
727 int max_mnt_count;
728 int mnt_count;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700729
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900730 /* nilfs->ns_sem must be locked by the caller. */
Ryusuke Konishif7545142011-03-09 11:05:08 +0900731 sbp = nilfs_prepare_super(sb, 0);
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900732 if (!sbp)
733 return -EIO;
734
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900735 if (!is_mount)
736 goto skip_mount_setup;
737
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900738 max_mnt_count = le16_to_cpu(sbp[0]->s_max_mnt_count);
739 mnt_count = le16_to_cpu(sbp[0]->s_mnt_count);
740
Ryusuke Konishif50a4c82009-11-19 16:58:40 +0900741 if (nilfs->ns_mount_state & NILFS_ERROR_FS) {
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700742 printk(KERN_WARNING
743 "NILFS warning: mounting fs with errors\n");
744#if 0
745 } else if (max_mnt_count >= 0 && mnt_count >= max_mnt_count) {
746 printk(KERN_WARNING
747 "NILFS warning: maximal mount count reached\n");
748#endif
749 }
750 if (!max_mnt_count)
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900751 sbp[0]->s_max_mnt_count = cpu_to_le16(NILFS_DFL_MAX_MNT_COUNT);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700752
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900753 sbp[0]->s_mnt_count = cpu_to_le16(mnt_count + 1);
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900754 sbp[0]->s_mtime = cpu_to_le64(get_seconds());
755
756skip_mount_setup:
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900757 sbp[0]->s_state =
758 cpu_to_le16(le16_to_cpu(sbp[0]->s_state) & ~NILFS_VALID_FS);
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900759 /* synchronize sbp[1] with sbp[0] */
Ryusuke Konishi0ca7a5b2011-01-21 16:40:31 +0900760 if (sbp[1])
761 memcpy(sbp[1], sbp[0], nilfs->ns_sbsize);
Ryusuke Konishif7545142011-03-09 11:05:08 +0900762 return nilfs_commit_super(sb, NILFS_SB_COMMIT_ALL);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700763}
764
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700765struct nilfs_super_block *nilfs_read_super_block(struct super_block *sb,
766 u64 pos, int blocksize,
767 struct buffer_head **pbh)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700768{
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700769 unsigned long long sb_index = pos;
770 unsigned long offset;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700771
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700772 offset = do_div(sb_index, blocksize);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700773 *pbh = sb_bread(sb, sb_index);
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700774 if (!*pbh)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700775 return NULL;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700776 return (struct nilfs_super_block *)((char *)(*pbh)->b_data + offset);
777}
778
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700779int nilfs_store_magic_and_option(struct super_block *sb,
780 struct nilfs_super_block *sbp,
781 char *data)
782{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900783 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700784
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700785 sb->s_magic = le16_to_cpu(sbp->s_magic);
786
787 /* FS independent flags */
788#ifdef NILFS_ATIME_DISABLE
789 sb->s_flags |= MS_NOATIME;
790#endif
791
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900792 nilfs_set_default_options(sb, sbp);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700793
Ryusuke Konishi574e6c32011-03-09 11:05:07 +0900794 nilfs->ns_resuid = le16_to_cpu(sbp->s_def_resuid);
795 nilfs->ns_resgid = le16_to_cpu(sbp->s_def_resgid);
796 nilfs->ns_interval = le32_to_cpu(sbp->s_c_interval);
797 nilfs->ns_watermark = le32_to_cpu(sbp->s_c_block_max);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700798
Ryusuke Konishi7c017452010-07-05 20:08:33 +0900799 return !parse_options(data, sb, 0) ? -EINVAL : 0 ;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700800}
801
Ryusuke Konishic5ca48a2010-07-22 03:22:20 +0900802int nilfs_check_feature_compatibility(struct super_block *sb,
803 struct nilfs_super_block *sbp)
804{
805 __u64 features;
806
807 features = le64_to_cpu(sbp->s_feature_incompat) &
808 ~NILFS_FEATURE_INCOMPAT_SUPP;
809 if (features) {
810 printk(KERN_ERR "NILFS: couldn't mount because of unsupported "
811 "optional features (%llx)\n",
812 (unsigned long long)features);
813 return -EINVAL;
814 }
815 features = le64_to_cpu(sbp->s_feature_compat_ro) &
816 ~NILFS_FEATURE_COMPAT_RO_SUPP;
817 if (!(sb->s_flags & MS_RDONLY) && features) {
818 printk(KERN_ERR "NILFS: couldn't mount RDWR because of "
819 "unsupported optional features (%llx)\n",
820 (unsigned long long)features);
821 return -EINVAL;
822 }
823 return 0;
824}
825
Ryusuke Konishi367ea332010-08-26 01:52:51 +0900826static int nilfs_get_root_dentry(struct super_block *sb,
827 struct nilfs_root *root,
828 struct dentry **root_dentry)
829{
830 struct inode *inode;
831 struct dentry *dentry;
832 int ret = 0;
833
834 inode = nilfs_iget(sb, root, NILFS_ROOT_INO);
835 if (IS_ERR(inode)) {
836 printk(KERN_ERR "NILFS: get root inode failed\n");
837 ret = PTR_ERR(inode);
838 goto out;
839 }
840 if (!S_ISDIR(inode->i_mode) || !inode->i_blocks || !inode->i_size) {
841 iput(inode);
842 printk(KERN_ERR "NILFS: corrupt root inode.\n");
843 ret = -EINVAL;
844 goto out;
845 }
846
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900847 if (root->cno == NILFS_CPTREE_CURRENT_CNO) {
848 dentry = d_find_alias(inode);
849 if (!dentry) {
850 dentry = d_alloc_root(inode);
851 if (!dentry) {
852 iput(inode);
853 ret = -ENOMEM;
854 goto failed_dentry;
855 }
856 } else {
857 iput(inode);
858 }
859 } else {
860 dentry = d_obtain_alias(inode);
861 if (IS_ERR(dentry)) {
862 ret = PTR_ERR(dentry);
863 goto failed_dentry;
864 }
Ryusuke Konishi367ea332010-08-26 01:52:51 +0900865 }
866 *root_dentry = dentry;
867 out:
868 return ret;
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900869
870 failed_dentry:
871 printk(KERN_ERR "NILFS: get root dentry failed\n");
872 goto out;
Ryusuke Konishi367ea332010-08-26 01:52:51 +0900873}
874
Ryusuke Konishiab4d8f72010-08-26 02:15:41 +0900875static int nilfs_attach_snapshot(struct super_block *s, __u64 cno,
876 struct dentry **root_dentry)
877{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900878 struct the_nilfs *nilfs = s->s_fs_info;
Ryusuke Konishiab4d8f72010-08-26 02:15:41 +0900879 struct nilfs_root *root;
880 int ret;
881
882 down_read(&nilfs->ns_segctor_sem);
883 ret = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile, cno);
884 up_read(&nilfs->ns_segctor_sem);
885 if (ret < 0) {
886 ret = (ret == -ENOENT) ? -EINVAL : ret;
887 goto out;
888 } else if (!ret) {
889 printk(KERN_ERR "NILFS: The specified checkpoint is "
890 "not a snapshot (checkpoint number=%llu).\n",
891 (unsigned long long)cno);
892 ret = -EINVAL;
893 goto out;
894 }
895
Ryusuke Konishif7545142011-03-09 11:05:08 +0900896 ret = nilfs_attach_checkpoint(s, cno, false, &root);
Ryusuke Konishiab4d8f72010-08-26 02:15:41 +0900897 if (ret) {
898 printk(KERN_ERR "NILFS: error loading snapshot "
899 "(checkpoint number=%llu).\n",
900 (unsigned long long)cno);
901 goto out;
902 }
903 ret = nilfs_get_root_dentry(s, root, root_dentry);
904 nilfs_put_root(root);
905 out:
906 return ret;
907}
908
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900909static int nilfs_tree_was_touched(struct dentry *root_dentry)
910{
Nick Pigginb7ab39f2011-01-07 17:49:32 +1100911 return root_dentry->d_count > 1;
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900912}
913
914/**
915 * nilfs_try_to_shrink_tree() - try to shrink dentries of a checkpoint
916 * @root_dentry: root dentry of the tree to be shrunk
917 *
918 * This function returns true if the tree was in-use.
919 */
920static int nilfs_try_to_shrink_tree(struct dentry *root_dentry)
921{
922 if (have_submounts(root_dentry))
923 return true;
924 shrink_dcache_parent(root_dentry);
925 return nilfs_tree_was_touched(root_dentry);
926}
927
Ryusuke Konishi032dbb32010-09-13 11:16:34 +0900928int nilfs_checkpoint_is_mounted(struct super_block *sb, __u64 cno)
929{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900930 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi032dbb32010-09-13 11:16:34 +0900931 struct nilfs_root *root;
932 struct inode *inode;
933 struct dentry *dentry;
934 int ret;
935
936 if (cno < 0 || cno > nilfs->ns_cno)
937 return false;
938
939 if (cno >= nilfs_last_cno(nilfs))
940 return true; /* protect recent checkpoints */
941
942 ret = false;
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900943 root = nilfs_lookup_root(nilfs, cno);
Ryusuke Konishi032dbb32010-09-13 11:16:34 +0900944 if (root) {
945 inode = nilfs_ilookup(sb, root, NILFS_ROOT_INO);
946 if (inode) {
947 dentry = d_find_alias(inode);
948 if (dentry) {
949 if (nilfs_tree_was_touched(dentry))
950 ret = nilfs_try_to_shrink_tree(dentry);
951 dput(dentry);
952 }
953 iput(inode);
954 }
955 nilfs_put_root(root);
956 }
957 return ret;
958}
959
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700960/**
961 * nilfs_fill_super() - initialize a super block instance
962 * @sb: super_block
963 * @data: mount options
964 * @silent: silent mode flag
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700965 *
Ryusuke Konishiaa7dfb82009-06-08 01:39:33 +0900966 * This function is called exclusively by nilfs->ns_mount_mutex.
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700967 * So, the recovery process is protected from other simultaneous mounts.
968 */
969static int
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +0900970nilfs_fill_super(struct super_block *sb, void *data, int silent)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700971{
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +0900972 struct the_nilfs *nilfs;
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900973 struct nilfs_root *fsroot;
Ryusuke Konishi026a7d62010-10-07 14:19:48 +0900974 struct backing_dev_info *bdi;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700975 __u64 cno;
976 int err;
977
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900978 nilfs = alloc_nilfs(sb->s_bdev);
979 if (!nilfs)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700980 return -ENOMEM;
981
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900982 sb->s_fs_info = nilfs;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700983
Ryusuke Konishif7545142011-03-09 11:05:08 +0900984 err = init_nilfs(nilfs, sb, (char *)data);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700985 if (err)
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +0900986 goto failed_nilfs;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700987
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700988 sb->s_op = &nilfs_sops;
989 sb->s_export_op = &nilfs_export_ops;
990 sb->s_root = NULL;
Ryusuke Konishi61239232009-04-06 19:02:00 -0700991 sb->s_time_gran = 1;
Ryusuke Konishi026a7d62010-10-07 14:19:48 +0900992
993 bdi = sb->s_bdev->bd_inode->i_mapping->backing_dev_info;
994 sb->s_bdi = bdi ? : &default_backing_dev_info;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700995
Ryusuke Konishif7545142011-03-09 11:05:08 +0900996 err = load_nilfs(nilfs, sb);
Ryusuke Konishif50a4c82009-11-19 16:58:40 +0900997 if (err)
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +0900998 goto failed_nilfs;
Ryusuke Konishif50a4c82009-11-19 16:58:40 +0900999
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001000 cno = nilfs_last_cno(nilfs);
Ryusuke Konishif7545142011-03-09 11:05:08 +09001001 err = nilfs_attach_checkpoint(sb, cno, true, &fsroot);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001002 if (err) {
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001003 printk(KERN_ERR "NILFS: error loading last checkpoint "
1004 "(checkpoint number=%llu).\n", (unsigned long long)cno);
Ryusuke Konishif1e89c82010-09-05 12:20:59 +09001005 goto failed_unload;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001006 }
1007
1008 if (!(sb->s_flags & MS_RDONLY)) {
Ryusuke Konishif7545142011-03-09 11:05:08 +09001009 err = nilfs_attach_log_writer(sb, fsroot);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001010 if (err)
1011 goto failed_checkpoint;
1012 }
1013
Ryusuke Konishi367ea332010-08-26 01:52:51 +09001014 err = nilfs_get_root_dentry(sb, fsroot, &sb->s_root);
1015 if (err)
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001016 goto failed_segctor;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001017
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +09001018 nilfs_put_root(fsroot);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001019
1020 if (!(sb->s_flags & MS_RDONLY)) {
1021 down_write(&nilfs->ns_sem);
Ryusuke Konishif7545142011-03-09 11:05:08 +09001022 nilfs_setup_super(sb, true);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001023 up_write(&nilfs->ns_sem);
1024 }
1025
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001026 return 0;
1027
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001028 failed_segctor:
Ryusuke Konishif7545142011-03-09 11:05:08 +09001029 nilfs_detach_log_writer(sb);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001030
1031 failed_checkpoint:
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +09001032 nilfs_put_root(fsroot);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001033
Ryusuke Konishif1e89c82010-09-05 12:20:59 +09001034 failed_unload:
1035 iput(nilfs->ns_sufile);
1036 iput(nilfs->ns_cpfile);
1037 iput(nilfs->ns_dat);
1038
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001039 failed_nilfs:
1040 destroy_nilfs(nilfs);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001041 return err;
1042}
1043
1044static int nilfs_remount(struct super_block *sb, int *flags, char *data)
1045{
Ryusuke Konishie3154e92011-03-09 11:05:08 +09001046 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001047 unsigned long old_sb_flags;
Ryusuke Konishi06df0f92010-12-27 00:04:06 +09001048 unsigned long old_mount_opt;
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001049 int err;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001050
1051 old_sb_flags = sb->s_flags;
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +09001052 old_mount_opt = nilfs->ns_mount_opt;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001053
Ryusuke Konishi7c017452010-07-05 20:08:33 +09001054 if (!parse_options(data, sb, 1)) {
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001055 err = -EINVAL;
1056 goto restore_opts;
1057 }
1058 sb->s_flags = (sb->s_flags & ~MS_POSIXACL);
1059
Ryusuke Konishid240e062010-05-09 21:51:53 +09001060 err = -EINVAL;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001061
Ryusuke Konishi02345762009-11-20 03:28:01 +09001062 if (!nilfs_valid_fs(nilfs)) {
1063 printk(KERN_WARNING "NILFS (device %s): couldn't "
1064 "remount because the filesystem is in an "
1065 "incomplete recovery state.\n", sb->s_id);
Ryusuke Konishi02345762009-11-20 03:28:01 +09001066 goto restore_opts;
1067 }
1068
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001069 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
1070 goto out;
1071 if (*flags & MS_RDONLY) {
Ryusuke Konishif7545142011-03-09 11:05:08 +09001072 /* Shutting down log writer */
1073 nilfs_detach_log_writer(sb);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001074 sb->s_flags |= MS_RDONLY;
1075
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001076 /*
1077 * Remounting a valid RW partition RDONLY, so set
1078 * the RDONLY flag and then mark the partition as valid again.
1079 */
1080 down_write(&nilfs->ns_sem);
Ryusuke Konishif7545142011-03-09 11:05:08 +09001081 nilfs_cleanup_super(sb);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001082 up_write(&nilfs->ns_sem);
1083 } else {
Ryusuke Konishic5ca48a2010-07-22 03:22:20 +09001084 __u64 features;
Ryusuke Konishie912a5b2010-08-14 13:07:15 +09001085 struct nilfs_root *root;
Ryusuke Konishic5ca48a2010-07-22 03:22:20 +09001086
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001087 /*
1088 * Mounting a RDONLY partition read-write, so reread and
1089 * store the current valid flag. (It may have been changed
1090 * by fsck since we originally mounted the partition.)
1091 */
Ryusuke Konishic5ca48a2010-07-22 03:22:20 +09001092 down_read(&nilfs->ns_sem);
1093 features = le64_to_cpu(nilfs->ns_sbp[0]->s_feature_compat_ro) &
1094 ~NILFS_FEATURE_COMPAT_RO_SUPP;
1095 up_read(&nilfs->ns_sem);
1096 if (features) {
1097 printk(KERN_WARNING "NILFS (device %s): couldn't "
1098 "remount RDWR because of unsupported optional "
1099 "features (%llx)\n",
1100 sb->s_id, (unsigned long long)features);
1101 err = -EROFS;
1102 goto restore_opts;
1103 }
1104
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001105 sb->s_flags &= ~MS_RDONLY;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001106
Ryusuke Konishie912a5b2010-08-14 13:07:15 +09001107 root = NILFS_I(sb->s_root->d_inode)->i_root;
Ryusuke Konishif7545142011-03-09 11:05:08 +09001108 err = nilfs_attach_log_writer(sb, root);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001109 if (err)
Ryusuke Konishie59399d2009-06-08 01:39:32 +09001110 goto restore_opts;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001111
1112 down_write(&nilfs->ns_sem);
Ryusuke Konishif7545142011-03-09 11:05:08 +09001113 nilfs_setup_super(sb, true);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001114 up_write(&nilfs->ns_sem);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001115 }
1116 out:
1117 return 0;
1118
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001119 restore_opts:
1120 sb->s_flags = old_sb_flags;
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +09001121 nilfs->ns_mount_opt = old_mount_opt;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001122 return err;
1123}
1124
1125struct nilfs_super_data {
1126 struct block_device *bdev;
1127 __u64 cno;
1128 int flags;
1129};
1130
1131/**
1132 * nilfs_identify - pre-read mount options needed to identify mount instance
1133 * @data: mount options
1134 * @sd: nilfs_super_data
1135 */
1136static int nilfs_identify(char *data, struct nilfs_super_data *sd)
1137{
1138 char *p, *options = data;
1139 substring_t args[MAX_OPT_ARGS];
Ryusuke Konishic05dbfc2010-09-16 00:36:24 +09001140 int token;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001141 int ret = 0;
1142
1143 do {
1144 p = strsep(&options, ",");
1145 if (p != NULL && *p) {
1146 token = match_token(p, tokens, args);
1147 if (token == Opt_snapshot) {
Ryusuke Konishic05dbfc2010-09-16 00:36:24 +09001148 if (!(sd->flags & MS_RDONLY)) {
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001149 ret++;
Ryusuke Konishic05dbfc2010-09-16 00:36:24 +09001150 } else {
1151 sd->cno = simple_strtoull(args[0].from,
1152 NULL, 0);
1153 /*
1154 * No need to see the end pointer;
1155 * match_token() has done syntax
1156 * checking.
1157 */
1158 if (sd->cno == 0)
1159 ret++;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001160 }
1161 }
1162 if (ret)
1163 printk(KERN_ERR
1164 "NILFS: invalid mount option: %s\n", p);
1165 }
1166 if (!options)
1167 break;
1168 BUG_ON(options == data);
1169 *(options - 1) = ',';
1170 } while (!ret);
1171 return ret;
1172}
1173
1174static int nilfs_set_bdev_super(struct super_block *s, void *data)
1175{
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001176 s->s_bdev = data;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001177 s->s_dev = s->s_bdev->bd_dev;
1178 return 0;
1179}
1180
1181static int nilfs_test_bdev_super(struct super_block *s, void *data)
1182{
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001183 return (void *)s->s_bdev == data;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001184}
1185
Al Viroe4c59d62010-07-26 12:19:34 +04001186static struct dentry *
1187nilfs_mount(struct file_system_type *fs_type, int flags,
1188 const char *dev_name, void *data)
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001189{
1190 struct nilfs_super_data sd;
Ryusuke Konishi33c8e572009-06-08 01:39:29 +09001191 struct super_block *s;
Tejun Heod4d77622010-11-13 11:55:18 +01001192 fmode_t mode = FMODE_READ | FMODE_EXCL;
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001193 struct dentry *root_dentry;
1194 int err, s_new = false;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001195
Ryusuke Konishi13e90552010-05-09 02:57:57 +09001196 if (!(flags & MS_RDONLY))
1197 mode |= FMODE_WRITE;
1198
Tejun Heod4d77622010-11-13 11:55:18 +01001199 sd.bdev = blkdev_get_by_path(dev_name, mode, fs_type);
Jan Blunckd6d4c192010-02-24 13:25:32 +01001200 if (IS_ERR(sd.bdev))
Al Viroe4c59d62010-07-26 12:19:34 +04001201 return ERR_CAST(sd.bdev);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001202
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001203 sd.cno = 0;
1204 sd.flags = flags;
1205 if (nilfs_identify((char *)data, &sd)) {
1206 err = -EINVAL;
1207 goto failed;
1208 }
1209
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +09001210 /*
1211 * once the super is inserted into the list by sget, s_umount
1212 * will protect the lockfs code from trying to start a snapshot
1213 * while we are mounting
1214 */
1215 mutex_lock(&sd.bdev->bd_fsfreeze_mutex);
1216 if (sd.bdev->bd_fsfreeze_count > 0) {
1217 mutex_unlock(&sd.bdev->bd_fsfreeze_mutex);
1218 err = -EBUSY;
Ryusuke Konishi33c8e572009-06-08 01:39:29 +09001219 goto failed;
1220 }
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001221 s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, sd.bdev);
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +09001222 mutex_unlock(&sd.bdev->bd_fsfreeze_mutex);
Ryusuke Konishi33c8e572009-06-08 01:39:29 +09001223 if (IS_ERR(s)) {
1224 err = PTR_ERR(s);
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001225 goto failed;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001226 }
1227
1228 if (!s->s_root) {
1229 char b[BDEVNAME_SIZE];
1230
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001231 s_new = true;
1232
Ryusuke Konishi33c8e572009-06-08 01:39:29 +09001233 /* New superblock instance created */
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001234 s->s_flags = flags;
Ryusuke Konishi4571b822010-05-09 03:01:32 +09001235 s->s_mode = mode;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001236 strlcpy(s->s_id, bdevname(sd.bdev, b), sizeof(s->s_id));
1237 sb_set_blocksize(s, block_size(sd.bdev));
1238
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001239 err = nilfs_fill_super(s, data, flags & MS_SILENT ? 1 : 0);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001240 if (err)
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001241 goto failed_super;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001242
1243 s->s_flags |= MS_ACTIVE;
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001244 } else if (!sd.cno) {
1245 int busy = false;
1246
1247 if (nilfs_tree_was_touched(s->s_root)) {
1248 busy = nilfs_try_to_shrink_tree(s->s_root);
1249 if (busy && (flags ^ s->s_flags) & MS_RDONLY) {
1250 printk(KERN_ERR "NILFS: the device already "
1251 "has a %s mount.\n",
1252 (s->s_flags & MS_RDONLY) ?
1253 "read-only" : "read/write");
1254 err = -EBUSY;
1255 goto failed_super;
1256 }
1257 }
1258 if (!busy) {
1259 /*
1260 * Try remount to setup mount states if the current
1261 * tree is not mounted and only snapshots use this sb.
1262 */
1263 err = nilfs_remount(s, &flags, data);
1264 if (err)
1265 goto failed_super;
1266 }
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001267 }
1268
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001269 if (sd.cno) {
1270 err = nilfs_attach_snapshot(s, sd.cno, &root_dentry);
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001271 if (err)
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001272 goto failed_super;
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001273 } else {
1274 root_dentry = dget(s->s_root);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001275 }
1276
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001277 if (!s_new)
Tejun Heod4d77622010-11-13 11:55:18 +01001278 blkdev_put(sd.bdev, mode);
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001279
Al Viroe4c59d62010-07-26 12:19:34 +04001280 return root_dentry;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001281
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001282 failed_super:
Al Viroa95161a2009-08-09 00:52:02 +04001283 deactivate_locked_super(s);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001284
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001285 failed:
1286 if (!s_new)
Tejun Heod4d77622010-11-13 11:55:18 +01001287 blkdev_put(sd.bdev, mode);
Al Viroe4c59d62010-07-26 12:19:34 +04001288 return ERR_PTR(err);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001289}
1290
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001291struct file_system_type nilfs_fs_type = {
1292 .owner = THIS_MODULE,
1293 .name = "nilfs2",
Al Viroe4c59d62010-07-26 12:19:34 +04001294 .mount = nilfs_mount,
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001295 .kill_sb = kill_block_super,
1296 .fs_flags = FS_REQUIRES_DEV,
1297};
1298
Li Hong41c88bd2010-04-06 00:54:11 +08001299static void nilfs_inode_init_once(void *obj)
1300{
1301 struct nilfs_inode_info *ii = obj;
1302
1303 INIT_LIST_HEAD(&ii->i_dirty);
1304#ifdef CONFIG_NILFS_XATTR
1305 init_rwsem(&ii->xattr_sem);
1306#endif
Miklos Szeredi2aa15892011-02-23 13:49:47 +01001307 address_space_init_once(&ii->i_btnode_cache);
Ryusuke Konishi05d0e942010-07-10 20:52:09 +09001308 ii->i_bmap = &ii->i_bmap_data;
Li Hong41c88bd2010-04-06 00:54:11 +08001309 inode_init_once(&ii->vfs_inode);
1310}
1311
1312static void nilfs_segbuf_init_once(void *obj)
1313{
1314 memset(obj, 0, sizeof(struct nilfs_segment_buffer));
1315}
1316
1317static void nilfs_destroy_cachep(void)
1318{
Ryusuke Konishi84cb0992010-05-22 12:49:32 +09001319 if (nilfs_inode_cachep)
Li Hong41c88bd2010-04-06 00:54:11 +08001320 kmem_cache_destroy(nilfs_inode_cachep);
Ryusuke Konishi84cb0992010-05-22 12:49:32 +09001321 if (nilfs_transaction_cachep)
Li Hong41c88bd2010-04-06 00:54:11 +08001322 kmem_cache_destroy(nilfs_transaction_cachep);
Ryusuke Konishi84cb0992010-05-22 12:49:32 +09001323 if (nilfs_segbuf_cachep)
Li Hong41c88bd2010-04-06 00:54:11 +08001324 kmem_cache_destroy(nilfs_segbuf_cachep);
Ryusuke Konishi84cb0992010-05-22 12:49:32 +09001325 if (nilfs_btree_path_cache)
Li Hong41c88bd2010-04-06 00:54:11 +08001326 kmem_cache_destroy(nilfs_btree_path_cache);
1327}
1328
1329static int __init nilfs_init_cachep(void)
1330{
1331 nilfs_inode_cachep = kmem_cache_create("nilfs2_inode_cache",
1332 sizeof(struct nilfs_inode_info), 0,
1333 SLAB_RECLAIM_ACCOUNT, nilfs_inode_init_once);
1334 if (!nilfs_inode_cachep)
1335 goto fail;
1336
1337 nilfs_transaction_cachep = kmem_cache_create("nilfs2_transaction_cache",
1338 sizeof(struct nilfs_transaction_info), 0,
1339 SLAB_RECLAIM_ACCOUNT, NULL);
1340 if (!nilfs_transaction_cachep)
1341 goto fail;
1342
1343 nilfs_segbuf_cachep = kmem_cache_create("nilfs2_segbuf_cache",
1344 sizeof(struct nilfs_segment_buffer), 0,
1345 SLAB_RECLAIM_ACCOUNT, nilfs_segbuf_init_once);
1346 if (!nilfs_segbuf_cachep)
1347 goto fail;
1348
1349 nilfs_btree_path_cache = kmem_cache_create("nilfs2_btree_path_cache",
1350 sizeof(struct nilfs_btree_path) * NILFS_BTREE_LEVEL_MAX,
1351 0, 0, NULL);
1352 if (!nilfs_btree_path_cache)
1353 goto fail;
1354
1355 return 0;
1356
1357fail:
1358 nilfs_destroy_cachep();
1359 return -ENOMEM;
1360}
1361
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001362static int __init init_nilfs_fs(void)
1363{
1364 int err;
1365
Li Hong41c88bd2010-04-06 00:54:11 +08001366 err = nilfs_init_cachep();
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001367 if (err)
Li Hong41c88bd2010-04-06 00:54:11 +08001368 goto fail;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001369
1370 err = register_filesystem(&nilfs_fs_type);
1371 if (err)
Li Hong41c88bd2010-04-06 00:54:11 +08001372 goto free_cachep;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001373
Li Hong9f130262010-04-09 23:09:53 +08001374 printk(KERN_INFO "NILFS version 2 loaded\n");
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001375 return 0;
1376
Li Hong41c88bd2010-04-06 00:54:11 +08001377free_cachep:
1378 nilfs_destroy_cachep();
1379fail:
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001380 return err;
1381}
1382
1383static void __exit exit_nilfs_fs(void)
1384{
Li Hong41c88bd2010-04-06 00:54:11 +08001385 nilfs_destroy_cachep();
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001386 unregister_filesystem(&nilfs_fs_type);
1387}
1388
1389module_init(init_nilfs_fs)
1390module_exit(exit_nilfs_fs)