blob: 3c991dc84f2f2df6f8c9dccd922d8edbf1ff32a5 [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"
Ryusuke Konishi4e33f9e2011-05-05 01:23:58 +090059#include "sufile.h" /* nilfs_sufile_resize(), nilfs_sufile_set_alloc_range() */
Ryusuke Konishi783f6182009-04-06 19:01:35 -070060#include "ifile.h"
61#include "dat.h"
62#include "segment.h"
63#include "segbuf.h"
64
65MODULE_AUTHOR("NTT Corp.");
66MODULE_DESCRIPTION("A New Implementation of the Log-structured Filesystem "
67 "(NILFS)");
Ryusuke Konishi783f6182009-04-06 19:01:35 -070068MODULE_LICENSE("GPL");
69
Jiro SEKIBAabc0b502010-10-08 22:37:27 +090070static struct kmem_cache *nilfs_inode_cachep;
Li Hong41c88bd2010-04-06 00:54:11 +080071struct kmem_cache *nilfs_transaction_cachep;
72struct kmem_cache *nilfs_segbuf_cachep;
73struct kmem_cache *nilfs_btree_path_cache;
74
Ryusuke Konishif7545142011-03-09 11:05:08 +090075static int nilfs_setup_super(struct super_block *sb, int is_mount);
Ryusuke Konishi783f6182009-04-06 19:01:35 -070076static int nilfs_remount(struct super_block *sb, int *flags, char *data);
Ryusuke Konishi783f6182009-04-06 19:01:35 -070077
Ryusuke Konishif7545142011-03-09 11:05:08 +090078static void nilfs_set_error(struct super_block *sb)
Ryusuke Konishic8a11c82010-06-28 17:49:30 +090079{
Ryusuke Konishie3154e92011-03-09 11:05:08 +090080 struct the_nilfs *nilfs = sb->s_fs_info;
Jiro SEKIBAd26493b2010-06-28 17:49:32 +090081 struct nilfs_super_block **sbp;
Ryusuke Konishic8a11c82010-06-28 17:49:30 +090082
83 down_write(&nilfs->ns_sem);
84 if (!(nilfs->ns_mount_state & NILFS_ERROR_FS)) {
85 nilfs->ns_mount_state |= NILFS_ERROR_FS;
Ryusuke Konishif7545142011-03-09 11:05:08 +090086 sbp = nilfs_prepare_super(sb, 0);
Jiro SEKIBAd26493b2010-06-28 17:49:32 +090087 if (likely(sbp)) {
88 sbp[0]->s_state |= cpu_to_le16(NILFS_ERROR_FS);
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +090089 if (sbp[1])
90 sbp[1]->s_state |= cpu_to_le16(NILFS_ERROR_FS);
Ryusuke Konishif7545142011-03-09 11:05:08 +090091 nilfs_commit_super(sb, NILFS_SB_COMMIT_ALL);
Jiro SEKIBAd26493b2010-06-28 17:49:32 +090092 }
Ryusuke Konishic8a11c82010-06-28 17:49:30 +090093 }
94 up_write(&nilfs->ns_sem);
95}
96
Ryusuke Konishi783f6182009-04-06 19:01:35 -070097/**
98 * nilfs_error() - report failure condition on a filesystem
99 *
100 * nilfs_error() sets an ERROR_FS flag on the superblock as well as
101 * reporting an error message. It should be called when NILFS detects
102 * incoherences or defects of meta data on disk. As for sustainable
103 * errors such as a single-shot I/O error, nilfs_warning() or the printk()
104 * function should be used instead.
105 *
106 * The segment constructor must not call this function because it can
107 * kill itself.
108 */
109void nilfs_error(struct super_block *sb, const char *function,
110 const char *fmt, ...)
111{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900112 struct the_nilfs *nilfs = sb->s_fs_info;
Joe Perchesb004a5e2010-11-09 16:35:21 -0800113 struct va_format vaf;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700114 va_list args;
115
116 va_start(args, fmt);
Joe Perchesb004a5e2010-11-09 16:35:21 -0800117
118 vaf.fmt = fmt;
119 vaf.va = &args;
120
121 printk(KERN_CRIT "NILFS error (device %s): %s: %pV\n",
122 sb->s_id, function, &vaf);
123
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700124 va_end(args);
125
126 if (!(sb->s_flags & MS_RDONLY)) {
Ryusuke Konishif7545142011-03-09 11:05:08 +0900127 nilfs_set_error(sb);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700128
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900129 if (nilfs_test_opt(nilfs, ERRORS_RO)) {
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700130 printk(KERN_CRIT "Remounting filesystem read-only\n");
131 sb->s_flags |= MS_RDONLY;
132 }
133 }
134
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900135 if (nilfs_test_opt(nilfs, ERRORS_PANIC))
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700136 panic("NILFS (device %s): panic forced after error\n",
137 sb->s_id);
138}
139
140void nilfs_warning(struct super_block *sb, const char *function,
141 const char *fmt, ...)
142{
Joe Perchesb004a5e2010-11-09 16:35:21 -0800143 struct va_format vaf;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700144 va_list args;
145
146 va_start(args, fmt);
Joe Perchesb004a5e2010-11-09 16:35:21 -0800147
148 vaf.fmt = fmt;
149 vaf.va = &args;
150
151 printk(KERN_WARNING "NILFS warning (device %s): %s: %pV\n",
152 sb->s_id, function, &vaf);
153
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700154 va_end(args);
155}
156
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700157
Ryusuke Konishi2879ed62010-09-05 13:35:53 +0900158struct inode *nilfs_alloc_inode(struct super_block *sb)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700159{
160 struct nilfs_inode_info *ii;
161
162 ii = kmem_cache_alloc(nilfs_inode_cachep, GFP_NOFS);
163 if (!ii)
164 return NULL;
165 ii->i_bh = NULL;
166 ii->i_state = 0;
Ryusuke Konishi0e14a352010-08-20 21:20:29 +0900167 ii->i_cno = 0;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700168 ii->vfs_inode.i_version = 1;
Ryusuke Konishiaa405b12011-05-05 12:56:51 +0900169 nilfs_mapping_init(&ii->i_btnode_cache, &ii->vfs_inode, sb->s_bdi);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700170 return &ii->vfs_inode;
171}
172
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100173static void nilfs_i_callback(struct rcu_head *head)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700174{
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100175 struct inode *inode = container_of(head, struct inode, i_rcu);
Ryusuke Konishib91c9a92010-08-20 23:46:06 +0900176 struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
177
178 if (mdi) {
179 kfree(mdi->mi_bgl); /* kfree(NULL) is safe */
180 kfree(mdi);
181 }
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700182 kmem_cache_free(nilfs_inode_cachep, NILFS_I(inode));
183}
184
Nick Pigginfa0d7e3d2011-01-07 17:49:49 +1100185void nilfs_destroy_inode(struct inode *inode)
186{
187 call_rcu(&inode->i_rcu, nilfs_i_callback);
188}
189
Ryusuke Konishif7545142011-03-09 11:05:08 +0900190static int nilfs_sync_super(struct super_block *sb, int flag)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700191{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900192 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700193 int err;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700194
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700195 retry:
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700196 set_buffer_dirty(nilfs->ns_sbh[0]);
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900197 if (nilfs_test_opt(nilfs, BARRIER)) {
Christoph Hellwig87e99512010-08-11 17:05:45 +0200198 err = __sync_dirty_buffer(nilfs->ns_sbh[0],
Christoph Hellwigf8c131f2010-08-18 05:29:15 -0400199 WRITE_SYNC | WRITE_FLUSH_FUA);
Christoph Hellwig87e99512010-08-11 17:05:45 +0200200 } else {
201 err = sync_dirty_buffer(nilfs->ns_sbh[0]);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700202 }
Christoph Hellwig87e99512010-08-11 17:05:45 +0200203
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700204 if (unlikely(err)) {
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700205 printk(KERN_ERR
206 "NILFS: unable to write superblock (err=%d)\n", err);
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700207 if (err == -EIO && nilfs->ns_sbh[1]) {
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900208 /*
209 * sbp[0] points to newer log than sbp[1],
210 * so copy sbp[0] to sbp[1] to take over sbp[0].
211 */
212 memcpy(nilfs->ns_sbp[1], nilfs->ns_sbp[0],
213 nilfs->ns_sbsize);
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700214 nilfs_fall_back_super_block(nilfs);
215 goto retry;
216 }
217 } else {
218 struct nilfs_super_block *sbp = nilfs->ns_sbp[0];
219
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900220 nilfs->ns_sbwcount++;
221
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700222 /*
223 * The latest segment becomes trailable from the position
224 * written in superblock.
225 */
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700226 clear_nilfs_discontinued(nilfs);
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700227
228 /* update GC protection for recent segments */
229 if (nilfs->ns_sbh[1]) {
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900230 if (flag == NILFS_SB_COMMIT_ALL) {
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700231 set_buffer_dirty(nilfs->ns_sbh[1]);
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900232 if (sync_dirty_buffer(nilfs->ns_sbh[1]) < 0)
233 goto out;
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700234 }
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900235 if (le64_to_cpu(nilfs->ns_sbp[1]->s_last_cno) <
236 le64_to_cpu(nilfs->ns_sbp[0]->s_last_cno))
237 sbp = nilfs->ns_sbp[1];
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700238 }
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700239
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900240 spin_lock(&nilfs->ns_last_segment_lock);
241 nilfs->ns_prot_seq = le64_to_cpu(sbp->s_last_seq);
242 spin_unlock(&nilfs->ns_last_segment_lock);
243 }
244 out:
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700245 return err;
246}
247
Ryusuke Konishi60f46b72010-06-28 17:49:31 +0900248void nilfs_set_log_cursor(struct nilfs_super_block *sbp,
249 struct the_nilfs *nilfs)
250{
251 sector_t nfreeblocks;
252
253 /* nilfs->ns_sem must be locked by the caller. */
254 nilfs_count_free_blocks(nilfs, &nfreeblocks);
255 sbp->s_free_blocks_count = cpu_to_le64(nfreeblocks);
256
257 spin_lock(&nilfs->ns_last_segment_lock);
258 sbp->s_last_seq = cpu_to_le64(nilfs->ns_last_seq);
259 sbp->s_last_pseg = cpu_to_le64(nilfs->ns_last_pseg);
260 sbp->s_last_cno = cpu_to_le64(nilfs->ns_last_cno);
261 spin_unlock(&nilfs->ns_last_segment_lock);
262}
263
Ryusuke Konishif7545142011-03-09 11:05:08 +0900264struct nilfs_super_block **nilfs_prepare_super(struct super_block *sb,
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900265 int flip)
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900266{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900267 struct the_nilfs *nilfs = sb->s_fs_info;
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900268 struct nilfs_super_block **sbp = nilfs->ns_sbp;
269
270 /* nilfs->ns_sem must be locked by the caller. */
271 if (sbp[0]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) {
272 if (sbp[1] &&
273 sbp[1]->s_magic == cpu_to_le16(NILFS_SUPER_MAGIC)) {
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900274 memcpy(sbp[0], sbp[1], nilfs->ns_sbsize);
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900275 } else {
276 printk(KERN_CRIT "NILFS: superblock broke on dev %s\n",
Ryusuke Konishif7545142011-03-09 11:05:08 +0900277 sb->s_id);
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900278 return NULL;
279 }
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900280 } else if (sbp[1] &&
281 sbp[1]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) {
282 memcpy(sbp[1], sbp[0], nilfs->ns_sbsize);
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900283 }
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900284
285 if (flip && sbp[1])
286 nilfs_swap_super_block(nilfs);
287
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900288 return sbp;
289}
290
Ryusuke Konishif7545142011-03-09 11:05:08 +0900291int nilfs_commit_super(struct super_block *sb, int flag)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700292{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900293 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700294 struct nilfs_super_block **sbp = nilfs->ns_sbp;
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700295 time_t t;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700296
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900297 /* nilfs->ns_sem must be locked by the caller. */
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700298 t = get_seconds();
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900299 nilfs->ns_sbwtime = t;
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700300 sbp[0]->s_wtime = cpu_to_le64(t);
301 sbp[0]->s_sum = 0;
302 sbp[0]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed,
303 (unsigned char *)sbp[0],
304 nilfs->ns_sbsize));
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900305 if (flag == NILFS_SB_COMMIT_ALL && sbp[1]) {
306 sbp[1]->s_wtime = sbp[0]->s_wtime;
307 sbp[1]->s_sum = 0;
308 sbp[1]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed,
309 (unsigned char *)sbp[1],
310 nilfs->ns_sbsize));
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700311 }
Ryusuke Konishie605f0a2009-12-09 00:57:52 +0900312 clear_nilfs_sb_dirty(nilfs);
Ryusuke Konishif7545142011-03-09 11:05:08 +0900313 return nilfs_sync_super(sb, flag);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700314}
315
Ryusuke Konishi7ecaa462010-06-28 17:49:29 +0900316/**
317 * nilfs_cleanup_super() - write filesystem state for cleanup
Ryusuke Konishif7545142011-03-09 11:05:08 +0900318 * @sb: super block instance to be unmounted or degraded to read-only
Ryusuke Konishi7ecaa462010-06-28 17:49:29 +0900319 *
320 * This function restores state flags in the on-disk super block.
321 * This will set "clean" flag (i.e. NILFS_VALID_FS) unless the
322 * filesystem was not clean previously.
323 */
Ryusuke Konishif7545142011-03-09 11:05:08 +0900324int nilfs_cleanup_super(struct super_block *sb)
Ryusuke Konishi7ecaa462010-06-28 17:49:29 +0900325{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900326 struct the_nilfs *nilfs = sb->s_fs_info;
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900327 struct nilfs_super_block **sbp;
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900328 int flag = NILFS_SB_COMMIT;
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900329 int ret = -EIO;
Ryusuke Konishi7ecaa462010-06-28 17:49:29 +0900330
Ryusuke Konishif7545142011-03-09 11:05:08 +0900331 sbp = nilfs_prepare_super(sb, 0);
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900332 if (sbp) {
Ryusuke Konishif7545142011-03-09 11:05:08 +0900333 sbp[0]->s_state = cpu_to_le16(nilfs->ns_mount_state);
334 nilfs_set_log_cursor(sbp[0], nilfs);
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900335 if (sbp[1] && sbp[0]->s_last_cno == sbp[1]->s_last_cno) {
336 /*
337 * make the "clean" flag also to the opposite
338 * super block if both super blocks point to
339 * the same checkpoint.
340 */
341 sbp[1]->s_state = sbp[0]->s_state;
342 flag = NILFS_SB_COMMIT_ALL;
343 }
Ryusuke Konishif7545142011-03-09 11:05:08 +0900344 ret = nilfs_commit_super(sb, flag);
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900345 }
Ryusuke Konishi7ecaa462010-06-28 17:49:29 +0900346 return ret;
347}
348
Ryusuke Konishicfb0a4b2011-05-05 01:23:57 +0900349/**
350 * nilfs_move_2nd_super - relocate secondary super block
351 * @sb: super block instance
352 * @sb2off: new offset of the secondary super block (in bytes)
353 */
354static int nilfs_move_2nd_super(struct super_block *sb, loff_t sb2off)
355{
356 struct the_nilfs *nilfs = sb->s_fs_info;
357 struct buffer_head *nsbh;
358 struct nilfs_super_block *nsbp;
359 sector_t blocknr, newblocknr;
360 unsigned long offset;
361 int sb2i = -1; /* array index of the secondary superblock */
362 int ret = 0;
363
364 /* nilfs->ns_sem must be locked by the caller. */
365 if (nilfs->ns_sbh[1] &&
366 nilfs->ns_sbh[1]->b_blocknr > nilfs->ns_first_data_block) {
367 sb2i = 1;
368 blocknr = nilfs->ns_sbh[1]->b_blocknr;
369 } else if (nilfs->ns_sbh[0]->b_blocknr > nilfs->ns_first_data_block) {
370 sb2i = 0;
371 blocknr = nilfs->ns_sbh[0]->b_blocknr;
372 }
373 if (sb2i >= 0 && (u64)blocknr << nilfs->ns_blocksize_bits == sb2off)
374 goto out; /* super block location is unchanged */
375
376 /* Get new super block buffer */
377 newblocknr = sb2off >> nilfs->ns_blocksize_bits;
378 offset = sb2off & (nilfs->ns_blocksize - 1);
379 nsbh = sb_getblk(sb, newblocknr);
380 if (!nsbh) {
381 printk(KERN_WARNING
382 "NILFS warning: unable to move secondary superblock "
383 "to block %llu\n", (unsigned long long)newblocknr);
384 ret = -EIO;
385 goto out;
386 }
387 nsbp = (void *)nsbh->b_data + offset;
388 memset(nsbp, 0, nilfs->ns_blocksize);
389
390 if (sb2i >= 0) {
391 memcpy(nsbp, nilfs->ns_sbp[sb2i], nilfs->ns_sbsize);
392 brelse(nilfs->ns_sbh[sb2i]);
393 nilfs->ns_sbh[sb2i] = nsbh;
394 nilfs->ns_sbp[sb2i] = nsbp;
395 } else if (nilfs->ns_sbh[0]->b_blocknr < nilfs->ns_first_data_block) {
396 /* secondary super block will be restored to index 1 */
397 nilfs->ns_sbh[1] = nsbh;
398 nilfs->ns_sbp[1] = nsbp;
399 } else {
400 brelse(nsbh);
401 }
402out:
403 return ret;
404}
405
Ryusuke Konishi4e33f9e2011-05-05 01:23:58 +0900406/**
407 * nilfs_resize_fs - resize the filesystem
408 * @sb: super block instance
409 * @newsize: new size of the filesystem (in bytes)
410 */
411int nilfs_resize_fs(struct super_block *sb, __u64 newsize)
412{
413 struct the_nilfs *nilfs = sb->s_fs_info;
414 struct nilfs_super_block **sbp;
415 __u64 devsize, newnsegs;
416 loff_t sb2off;
417 int ret;
418
419 ret = -ERANGE;
420 devsize = i_size_read(sb->s_bdev->bd_inode);
421 if (newsize > devsize)
422 goto out;
423
424 /*
425 * Write lock is required to protect some functions depending
426 * on the number of segments, the number of reserved segments,
427 * and so forth.
428 */
429 down_write(&nilfs->ns_segctor_sem);
430
431 sb2off = NILFS_SB2_OFFSET_BYTES(newsize);
432 newnsegs = sb2off >> nilfs->ns_blocksize_bits;
433 do_div(newnsegs, nilfs->ns_blocks_per_segment);
434
435 ret = nilfs_sufile_resize(nilfs->ns_sufile, newnsegs);
436 up_write(&nilfs->ns_segctor_sem);
437 if (ret < 0)
438 goto out;
439
440 ret = nilfs_construct_segment(sb);
441 if (ret < 0)
442 goto out;
443
444 down_write(&nilfs->ns_sem);
445 nilfs_move_2nd_super(sb, sb2off);
446 ret = -EIO;
447 sbp = nilfs_prepare_super(sb, 0);
448 if (likely(sbp)) {
449 nilfs_set_log_cursor(sbp[0], nilfs);
450 /*
451 * Drop NILFS_RESIZE_FS flag for compatibility with
452 * mount-time resize which may be implemented in a
453 * future release.
454 */
455 sbp[0]->s_state = cpu_to_le16(le16_to_cpu(sbp[0]->s_state) &
456 ~NILFS_RESIZE_FS);
457 sbp[0]->s_dev_size = cpu_to_le64(newsize);
458 sbp[0]->s_nsegments = cpu_to_le64(nilfs->ns_nsegments);
459 if (sbp[1])
460 memcpy(sbp[1], sbp[0], nilfs->ns_sbsize);
461 ret = nilfs_commit_super(sb, NILFS_SB_COMMIT_ALL);
462 }
463 up_write(&nilfs->ns_sem);
464
465 /*
466 * Reset the range of allocatable segments last. This order
467 * is important in the case of expansion because the secondary
468 * superblock must be protected from log write until migration
469 * completes.
470 */
471 if (!ret)
472 nilfs_sufile_set_alloc_range(nilfs->ns_sufile, 0, newnsegs - 1);
473out:
474 return ret;
475}
476
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700477static void nilfs_put_super(struct super_block *sb)
478{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900479 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700480
Ryusuke Konishif7545142011-03-09 11:05:08 +0900481 nilfs_detach_log_writer(sb);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700482
483 if (!(sb->s_flags & MS_RDONLY)) {
484 down_write(&nilfs->ns_sem);
Ryusuke Konishif7545142011-03-09 11:05:08 +0900485 nilfs_cleanup_super(sb);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700486 up_write(&nilfs->ns_sem);
487 }
488
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900489 iput(nilfs->ns_sufile);
490 iput(nilfs->ns_cpfile);
491 iput(nilfs->ns_dat);
492
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +0900493 destroy_nilfs(nilfs);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700494 sb->s_fs_info = NULL;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700495}
496
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700497static int nilfs_sync_fs(struct super_block *sb, int wait)
498{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900499 struct the_nilfs *nilfs = sb->s_fs_info;
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900500 struct nilfs_super_block **sbp;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700501 int err = 0;
502
503 /* This function is called when super block should be written back */
504 if (wait)
505 err = nilfs_construct_segment(sb);
Jiro SEKIBA6233caa2009-07-23 01:26:33 +0900506
507 down_write(&nilfs->ns_sem);
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900508 if (nilfs_sb_dirty(nilfs)) {
Ryusuke Konishif7545142011-03-09 11:05:08 +0900509 sbp = nilfs_prepare_super(sb, nilfs_sb_will_flip(nilfs));
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900510 if (likely(sbp)) {
511 nilfs_set_log_cursor(sbp[0], nilfs);
Ryusuke Konishif7545142011-03-09 11:05:08 +0900512 nilfs_commit_super(sb, NILFS_SB_COMMIT);
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900513 }
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900514 }
Jiro SEKIBA6233caa2009-07-23 01:26:33 +0900515 up_write(&nilfs->ns_sem);
516
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700517 return err;
518}
519
Ryusuke Konishif7545142011-03-09 11:05:08 +0900520int nilfs_attach_checkpoint(struct super_block *sb, __u64 cno, int curr_mnt,
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900521 struct nilfs_root **rootp)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700522{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900523 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900524 struct nilfs_root *root;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700525 struct nilfs_checkpoint *raw_cp;
526 struct buffer_head *bh_cp;
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900527 int err = -ENOMEM;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700528
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900529 root = nilfs_find_or_create_root(
530 nilfs, curr_mnt ? NILFS_CPTREE_CURRENT_CNO : cno);
531 if (!root)
532 return err;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700533
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900534 if (root->ifile)
535 goto reuse; /* already attached checkpoint */
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700536
Zhang Qiang1154ecb2009-08-18 14:58:24 +0800537 down_read(&nilfs->ns_segctor_sem);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700538 err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, cno, 0, &raw_cp,
539 &bh_cp);
Zhang Qiang1154ecb2009-08-18 14:58:24 +0800540 up_read(&nilfs->ns_segctor_sem);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700541 if (unlikely(err)) {
542 if (err == -ENOENT || err == -EINVAL) {
543 printk(KERN_ERR
544 "NILFS: Invalid checkpoint "
545 "(checkpoint number=%llu)\n",
546 (unsigned long long)cno);
547 err = -EINVAL;
548 }
549 goto failed;
550 }
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900551
Ryusuke Konishif7545142011-03-09 11:05:08 +0900552 err = nilfs_ifile_read(sb, root, nilfs->ns_inode_size,
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900553 &raw_cp->cp_ifile_inode, &root->ifile);
554 if (err)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700555 goto failed_bh;
Ryusuke Konishib7c06342010-08-14 14:48:32 +0900556
557 atomic_set(&root->inodes_count, le64_to_cpu(raw_cp->cp_inodes_count));
558 atomic_set(&root->blocks_count, le64_to_cpu(raw_cp->cp_blocks_count));
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700559
560 nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp);
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900561
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900562 reuse:
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900563 *rootp = root;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700564 return 0;
565
566 failed_bh:
567 nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp);
568 failed:
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900569 nilfs_put_root(root);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700570
571 return err;
572}
573
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900574static int nilfs_freeze(struct super_block *sb)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700575{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900576 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900577 int err;
578
579 if (sb->s_flags & MS_RDONLY)
580 return 0;
581
582 /* Mark super block clean */
583 down_write(&nilfs->ns_sem);
Ryusuke Konishif7545142011-03-09 11:05:08 +0900584 err = nilfs_cleanup_super(sb);
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900585 up_write(&nilfs->ns_sem);
586 return err;
587}
588
589static int nilfs_unfreeze(struct super_block *sb)
590{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900591 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700592
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900593 if (sb->s_flags & MS_RDONLY)
594 return 0;
595
596 down_write(&nilfs->ns_sem);
Ryusuke Konishif7545142011-03-09 11:05:08 +0900597 nilfs_setup_super(sb, false);
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900598 up_write(&nilfs->ns_sem);
599 return 0;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700600}
601
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700602static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf)
603{
604 struct super_block *sb = dentry->d_sb;
Ryusuke Konishib7c06342010-08-14 14:48:32 +0900605 struct nilfs_root *root = NILFS_I(dentry->d_inode)->i_root;
606 struct the_nilfs *nilfs = root->nilfs;
Ryusuke Konishic306af22009-03-26 10:16:57 +0900607 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700608 unsigned long long blocks;
609 unsigned long overhead;
610 unsigned long nrsvblocks;
611 sector_t nfreeblocks;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700612 int err;
613
614 /*
615 * Compute all of the segment blocks
616 *
617 * The blocks before first segment and after last segment
618 * are excluded.
619 */
620 blocks = nilfs->ns_blocks_per_segment * nilfs->ns_nsegments
621 - nilfs->ns_first_data_block;
622 nrsvblocks = nilfs->ns_nrsvsegs * nilfs->ns_blocks_per_segment;
623
624 /*
625 * Compute the overhead
626 *
Ryusuke Konishi7a650042010-03-14 03:32:40 +0900627 * When distributing meta data blocks outside segment structure,
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700628 * We must count them as the overhead.
629 */
630 overhead = 0;
631
632 err = nilfs_count_free_blocks(nilfs, &nfreeblocks);
633 if (unlikely(err))
634 return err;
635
636 buf->f_type = NILFS_SUPER_MAGIC;
637 buf->f_bsize = sb->s_blocksize;
638 buf->f_blocks = blocks - overhead;
639 buf->f_bfree = nfreeblocks;
640 buf->f_bavail = (buf->f_bfree >= nrsvblocks) ?
641 (buf->f_bfree - nrsvblocks) : 0;
Ryusuke Konishib7c06342010-08-14 14:48:32 +0900642 buf->f_files = atomic_read(&root->inodes_count);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700643 buf->f_ffree = 0; /* nilfs_count_free_inodes(sb); */
644 buf->f_namelen = NILFS_NAME_LEN;
Ryusuke Konishic306af22009-03-26 10:16:57 +0900645 buf->f_fsid.val[0] = (u32)id;
646 buf->f_fsid.val[1] = (u32)(id >> 32);
647
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700648 return 0;
649}
650
Al Viro34c80b12011-12-08 21:32:45 -0500651static int nilfs_show_options(struct seq_file *seq, struct dentry *dentry)
Jiro SEKIBAb58a2852009-06-24 20:06:34 +0900652{
Al Viro34c80b12011-12-08 21:32:45 -0500653 struct super_block *sb = dentry->d_sb;
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900654 struct the_nilfs *nilfs = sb->s_fs_info;
Al Viro34c80b12011-12-08 21:32:45 -0500655 struct nilfs_root *root = NILFS_I(dentry->d_inode)->i_root;
Jiro SEKIBAb58a2852009-06-24 20:06:34 +0900656
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900657 if (!nilfs_test_opt(nilfs, BARRIER))
Ryusuke Konishic6b4d572010-07-05 14:40:27 +0900658 seq_puts(seq, ",nobarrier");
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900659 if (root->cno != NILFS_CPTREE_CURRENT_CNO)
660 seq_printf(seq, ",cp=%llu", (unsigned long long)root->cno);
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900661 if (nilfs_test_opt(nilfs, ERRORS_PANIC))
Ryusuke Konishic6b4d572010-07-05 14:40:27 +0900662 seq_puts(seq, ",errors=panic");
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900663 if (nilfs_test_opt(nilfs, ERRORS_CONT))
Ryusuke Konishic6b4d572010-07-05 14:40:27 +0900664 seq_puts(seq, ",errors=continue");
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900665 if (nilfs_test_opt(nilfs, STRICT_ORDER))
Ryusuke Konishic6b4d572010-07-05 14:40:27 +0900666 seq_puts(seq, ",order=strict");
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900667 if (nilfs_test_opt(nilfs, NORECOVERY))
Ryusuke Konishic6b4d572010-07-05 14:40:27 +0900668 seq_puts(seq, ",norecovery");
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900669 if (nilfs_test_opt(nilfs, DISCARD))
Ryusuke Konishic6b4d572010-07-05 14:40:27 +0900670 seq_puts(seq, ",discard");
Jiro SEKIBAb58a2852009-06-24 20:06:34 +0900671
672 return 0;
673}
674
Alexey Dobriyanb87221d2009-09-21 17:01:09 -0700675static const struct super_operations nilfs_sops = {
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700676 .alloc_inode = nilfs_alloc_inode,
677 .destroy_inode = nilfs_destroy_inode,
678 .dirty_inode = nilfs_dirty_inode,
Al Viro6fd1e5c2010-06-07 11:55:00 -0400679 .evict_inode = nilfs_evict_inode,
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700680 .put_super = nilfs_put_super,
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700681 .sync_fs = nilfs_sync_fs,
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900682 .freeze_fs = nilfs_freeze,
683 .unfreeze_fs = nilfs_unfreeze,
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700684 .statfs = nilfs_statfs,
685 .remount_fs = nilfs_remount,
Jiro SEKIBAb58a2852009-06-24 20:06:34 +0900686 .show_options = nilfs_show_options
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700687};
688
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700689enum {
690 Opt_err_cont, Opt_err_panic, Opt_err_ro,
Ryusuke Konishi773bc4f2010-07-05 13:00:08 +0900691 Opt_barrier, Opt_nobarrier, Opt_snapshot, Opt_order, Opt_norecovery,
Ryusuke Konishi802d3172010-07-05 14:27:04 +0900692 Opt_discard, Opt_nodiscard, Opt_err,
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700693};
694
695static match_table_t tokens = {
696 {Opt_err_cont, "errors=continue"},
697 {Opt_err_panic, "errors=panic"},
698 {Opt_err_ro, "errors=remount-ro"},
Ryusuke Konishi773bc4f2010-07-05 13:00:08 +0900699 {Opt_barrier, "barrier"},
Jiro SEKIBA91f19532009-11-12 14:07:26 +0900700 {Opt_nobarrier, "nobarrier"},
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700701 {Opt_snapshot, "cp=%u"},
702 {Opt_order, "order=%s"},
Ryusuke Konishi02345762009-11-20 03:28:01 +0900703 {Opt_norecovery, "norecovery"},
Jiro SEKIBAe902ec92010-01-30 18:06:35 +0900704 {Opt_discard, "discard"},
Ryusuke Konishi802d3172010-07-05 14:27:04 +0900705 {Opt_nodiscard, "nodiscard"},
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700706 {Opt_err, NULL}
707};
708
Ryusuke Konishi7c017452010-07-05 20:08:33 +0900709static int parse_options(char *options, struct super_block *sb, int is_remount)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700710{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900711 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700712 char *p;
713 substring_t args[MAX_OPT_ARGS];
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700714
715 if (!options)
716 return 1;
717
718 while ((p = strsep(&options, ",")) != NULL) {
719 int token;
720 if (!*p)
721 continue;
722
723 token = match_token(p, tokens, args);
724 switch (token) {
Ryusuke Konishi773bc4f2010-07-05 13:00:08 +0900725 case Opt_barrier:
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900726 nilfs_set_opt(nilfs, BARRIER);
Ryusuke Konishi773bc4f2010-07-05 13:00:08 +0900727 break;
Jiro SEKIBA91f19532009-11-12 14:07:26 +0900728 case Opt_nobarrier:
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900729 nilfs_clear_opt(nilfs, BARRIER);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700730 break;
731 case Opt_order:
732 if (strcmp(args[0].from, "relaxed") == 0)
733 /* Ordered data semantics */
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900734 nilfs_clear_opt(nilfs, STRICT_ORDER);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700735 else if (strcmp(args[0].from, "strict") == 0)
736 /* Strict in-order semantics */
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900737 nilfs_set_opt(nilfs, STRICT_ORDER);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700738 else
739 return 0;
740 break;
741 case Opt_err_panic:
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900742 nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_PANIC);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700743 break;
744 case Opt_err_ro:
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900745 nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_RO);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700746 break;
747 case Opt_err_cont:
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900748 nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_CONT);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700749 break;
750 case Opt_snapshot:
Ryusuke Konishi7c017452010-07-05 20:08:33 +0900751 if (is_remount) {
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900752 printk(KERN_ERR
753 "NILFS: \"%s\" option is invalid "
754 "for remount.\n", p);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700755 return 0;
Ryusuke Konishi7c017452010-07-05 20:08:33 +0900756 }
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700757 break;
Ryusuke Konishi02345762009-11-20 03:28:01 +0900758 case Opt_norecovery:
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900759 nilfs_set_opt(nilfs, NORECOVERY);
Ryusuke Konishi02345762009-11-20 03:28:01 +0900760 break;
Jiro SEKIBAe902ec92010-01-30 18:06:35 +0900761 case Opt_discard:
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900762 nilfs_set_opt(nilfs, DISCARD);
Jiro SEKIBAe902ec92010-01-30 18:06:35 +0900763 break;
Ryusuke Konishi802d3172010-07-05 14:27:04 +0900764 case Opt_nodiscard:
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900765 nilfs_clear_opt(nilfs, DISCARD);
Ryusuke Konishi802d3172010-07-05 14:27:04 +0900766 break;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700767 default:
768 printk(KERN_ERR
769 "NILFS: Unrecognized mount option \"%s\"\n", p);
770 return 0;
771 }
772 }
773 return 1;
774}
775
776static inline void
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900777nilfs_set_default_options(struct super_block *sb,
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700778 struct nilfs_super_block *sbp)
779{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900780 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900781
782 nilfs->ns_mount_opt =
Ryusuke Konishi277a6a32010-04-02 18:02:33 +0900783 NILFS_MOUNT_ERRORS_RO | NILFS_MOUNT_BARRIER;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700784}
785
Ryusuke Konishif7545142011-03-09 11:05:08 +0900786static int nilfs_setup_super(struct super_block *sb, int is_mount)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700787{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900788 struct the_nilfs *nilfs = sb->s_fs_info;
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900789 struct nilfs_super_block **sbp;
790 int max_mnt_count;
791 int mnt_count;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700792
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900793 /* nilfs->ns_sem must be locked by the caller. */
Ryusuke Konishif7545142011-03-09 11:05:08 +0900794 sbp = nilfs_prepare_super(sb, 0);
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900795 if (!sbp)
796 return -EIO;
797
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900798 if (!is_mount)
799 goto skip_mount_setup;
800
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900801 max_mnt_count = le16_to_cpu(sbp[0]->s_max_mnt_count);
802 mnt_count = le16_to_cpu(sbp[0]->s_mnt_count);
803
Ryusuke Konishif50a4c82009-11-19 16:58:40 +0900804 if (nilfs->ns_mount_state & NILFS_ERROR_FS) {
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700805 printk(KERN_WARNING
806 "NILFS warning: mounting fs with errors\n");
807#if 0
808 } else if (max_mnt_count >= 0 && mnt_count >= max_mnt_count) {
809 printk(KERN_WARNING
810 "NILFS warning: maximal mount count reached\n");
811#endif
812 }
813 if (!max_mnt_count)
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900814 sbp[0]->s_max_mnt_count = cpu_to_le16(NILFS_DFL_MAX_MNT_COUNT);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700815
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900816 sbp[0]->s_mnt_count = cpu_to_le16(mnt_count + 1);
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900817 sbp[0]->s_mtime = cpu_to_le64(get_seconds());
818
819skip_mount_setup:
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900820 sbp[0]->s_state =
821 cpu_to_le16(le16_to_cpu(sbp[0]->s_state) & ~NILFS_VALID_FS);
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900822 /* synchronize sbp[1] with sbp[0] */
Ryusuke Konishi0ca7a5b2011-01-21 16:40:31 +0900823 if (sbp[1])
824 memcpy(sbp[1], sbp[0], nilfs->ns_sbsize);
Ryusuke Konishif7545142011-03-09 11:05:08 +0900825 return nilfs_commit_super(sb, NILFS_SB_COMMIT_ALL);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700826}
827
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700828struct nilfs_super_block *nilfs_read_super_block(struct super_block *sb,
829 u64 pos, int blocksize,
830 struct buffer_head **pbh)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700831{
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700832 unsigned long long sb_index = pos;
833 unsigned long offset;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700834
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700835 offset = do_div(sb_index, blocksize);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700836 *pbh = sb_bread(sb, sb_index);
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700837 if (!*pbh)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700838 return NULL;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700839 return (struct nilfs_super_block *)((char *)(*pbh)->b_data + offset);
840}
841
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700842int nilfs_store_magic_and_option(struct super_block *sb,
843 struct nilfs_super_block *sbp,
844 char *data)
845{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900846 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700847
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700848 sb->s_magic = le16_to_cpu(sbp->s_magic);
849
850 /* FS independent flags */
851#ifdef NILFS_ATIME_DISABLE
852 sb->s_flags |= MS_NOATIME;
853#endif
854
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900855 nilfs_set_default_options(sb, sbp);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700856
Ryusuke Konishi574e6c32011-03-09 11:05:07 +0900857 nilfs->ns_resuid = le16_to_cpu(sbp->s_def_resuid);
858 nilfs->ns_resgid = le16_to_cpu(sbp->s_def_resgid);
859 nilfs->ns_interval = le32_to_cpu(sbp->s_c_interval);
860 nilfs->ns_watermark = le32_to_cpu(sbp->s_c_block_max);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700861
Ryusuke Konishi7c017452010-07-05 20:08:33 +0900862 return !parse_options(data, sb, 0) ? -EINVAL : 0 ;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700863}
864
Ryusuke Konishic5ca48a2010-07-22 03:22:20 +0900865int nilfs_check_feature_compatibility(struct super_block *sb,
866 struct nilfs_super_block *sbp)
867{
868 __u64 features;
869
870 features = le64_to_cpu(sbp->s_feature_incompat) &
871 ~NILFS_FEATURE_INCOMPAT_SUPP;
872 if (features) {
873 printk(KERN_ERR "NILFS: couldn't mount because of unsupported "
874 "optional features (%llx)\n",
875 (unsigned long long)features);
876 return -EINVAL;
877 }
878 features = le64_to_cpu(sbp->s_feature_compat_ro) &
879 ~NILFS_FEATURE_COMPAT_RO_SUPP;
880 if (!(sb->s_flags & MS_RDONLY) && features) {
881 printk(KERN_ERR "NILFS: couldn't mount RDWR because of "
882 "unsupported optional features (%llx)\n",
883 (unsigned long long)features);
884 return -EINVAL;
885 }
886 return 0;
887}
888
Ryusuke Konishi367ea332010-08-26 01:52:51 +0900889static int nilfs_get_root_dentry(struct super_block *sb,
890 struct nilfs_root *root,
891 struct dentry **root_dentry)
892{
893 struct inode *inode;
894 struct dentry *dentry;
895 int ret = 0;
896
897 inode = nilfs_iget(sb, root, NILFS_ROOT_INO);
898 if (IS_ERR(inode)) {
899 printk(KERN_ERR "NILFS: get root inode failed\n");
900 ret = PTR_ERR(inode);
901 goto out;
902 }
903 if (!S_ISDIR(inode->i_mode) || !inode->i_blocks || !inode->i_size) {
904 iput(inode);
905 printk(KERN_ERR "NILFS: corrupt root inode.\n");
906 ret = -EINVAL;
907 goto out;
908 }
909
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900910 if (root->cno == NILFS_CPTREE_CURRENT_CNO) {
911 dentry = d_find_alias(inode);
912 if (!dentry) {
Al Viro48fde702012-01-08 22:15:13 -0500913 dentry = d_make_root(inode);
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900914 if (!dentry) {
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900915 ret = -ENOMEM;
916 goto failed_dentry;
917 }
918 } else {
919 iput(inode);
920 }
921 } else {
922 dentry = d_obtain_alias(inode);
923 if (IS_ERR(dentry)) {
924 ret = PTR_ERR(dentry);
925 goto failed_dentry;
926 }
Ryusuke Konishi367ea332010-08-26 01:52:51 +0900927 }
928 *root_dentry = dentry;
929 out:
930 return ret;
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900931
932 failed_dentry:
933 printk(KERN_ERR "NILFS: get root dentry failed\n");
934 goto out;
Ryusuke Konishi367ea332010-08-26 01:52:51 +0900935}
936
Ryusuke Konishiab4d8f72010-08-26 02:15:41 +0900937static int nilfs_attach_snapshot(struct super_block *s, __u64 cno,
938 struct dentry **root_dentry)
939{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900940 struct the_nilfs *nilfs = s->s_fs_info;
Ryusuke Konishiab4d8f72010-08-26 02:15:41 +0900941 struct nilfs_root *root;
942 int ret;
943
Ryusuke Konishi572d8b32012-07-30 14:42:07 -0700944 mutex_lock(&nilfs->ns_snapshot_mount_mutex);
945
Ryusuke Konishiab4d8f72010-08-26 02:15:41 +0900946 down_read(&nilfs->ns_segctor_sem);
947 ret = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile, cno);
948 up_read(&nilfs->ns_segctor_sem);
949 if (ret < 0) {
950 ret = (ret == -ENOENT) ? -EINVAL : ret;
951 goto out;
952 } else if (!ret) {
953 printk(KERN_ERR "NILFS: The specified checkpoint is "
954 "not a snapshot (checkpoint number=%llu).\n",
955 (unsigned long long)cno);
956 ret = -EINVAL;
957 goto out;
958 }
959
Ryusuke Konishif7545142011-03-09 11:05:08 +0900960 ret = nilfs_attach_checkpoint(s, cno, false, &root);
Ryusuke Konishiab4d8f72010-08-26 02:15:41 +0900961 if (ret) {
962 printk(KERN_ERR "NILFS: error loading snapshot "
963 "(checkpoint number=%llu).\n",
964 (unsigned long long)cno);
965 goto out;
966 }
967 ret = nilfs_get_root_dentry(s, root, root_dentry);
968 nilfs_put_root(root);
969 out:
Ryusuke Konishi572d8b32012-07-30 14:42:07 -0700970 mutex_unlock(&nilfs->ns_snapshot_mount_mutex);
Ryusuke Konishiab4d8f72010-08-26 02:15:41 +0900971 return ret;
972}
973
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900974static int nilfs_tree_was_touched(struct dentry *root_dentry)
975{
Nick Pigginb7ab39f2011-01-07 17:49:32 +1100976 return root_dentry->d_count > 1;
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900977}
978
979/**
980 * nilfs_try_to_shrink_tree() - try to shrink dentries of a checkpoint
981 * @root_dentry: root dentry of the tree to be shrunk
982 *
983 * This function returns true if the tree was in-use.
984 */
985static int nilfs_try_to_shrink_tree(struct dentry *root_dentry)
986{
987 if (have_submounts(root_dentry))
988 return true;
989 shrink_dcache_parent(root_dentry);
990 return nilfs_tree_was_touched(root_dentry);
991}
992
Ryusuke Konishi032dbb32010-09-13 11:16:34 +0900993int nilfs_checkpoint_is_mounted(struct super_block *sb, __u64 cno)
994{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900995 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi032dbb32010-09-13 11:16:34 +0900996 struct nilfs_root *root;
997 struct inode *inode;
998 struct dentry *dentry;
999 int ret;
1000
1001 if (cno < 0 || cno > nilfs->ns_cno)
1002 return false;
1003
1004 if (cno >= nilfs_last_cno(nilfs))
1005 return true; /* protect recent checkpoints */
1006
1007 ret = false;
Ryusuke Konishie3154e92011-03-09 11:05:08 +09001008 root = nilfs_lookup_root(nilfs, cno);
Ryusuke Konishi032dbb32010-09-13 11:16:34 +09001009 if (root) {
1010 inode = nilfs_ilookup(sb, root, NILFS_ROOT_INO);
1011 if (inode) {
1012 dentry = d_find_alias(inode);
1013 if (dentry) {
1014 if (nilfs_tree_was_touched(dentry))
1015 ret = nilfs_try_to_shrink_tree(dentry);
1016 dput(dentry);
1017 }
1018 iput(inode);
1019 }
1020 nilfs_put_root(root);
1021 }
1022 return ret;
1023}
1024
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001025/**
1026 * nilfs_fill_super() - initialize a super block instance
1027 * @sb: super_block
1028 * @data: mount options
1029 * @silent: silent mode flag
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001030 *
Ryusuke Konishiaa7dfb82009-06-08 01:39:33 +09001031 * This function is called exclusively by nilfs->ns_mount_mutex.
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001032 * So, the recovery process is protected from other simultaneous mounts.
1033 */
1034static int
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001035nilfs_fill_super(struct super_block *sb, void *data, int silent)
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001036{
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001037 struct the_nilfs *nilfs;
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +09001038 struct nilfs_root *fsroot;
Ryusuke Konishi026a7d62010-10-07 14:19:48 +09001039 struct backing_dev_info *bdi;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001040 __u64 cno;
1041 int err;
1042
Ryusuke Konishie3154e92011-03-09 11:05:08 +09001043 nilfs = alloc_nilfs(sb->s_bdev);
1044 if (!nilfs)
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001045 return -ENOMEM;
1046
Ryusuke Konishie3154e92011-03-09 11:05:08 +09001047 sb->s_fs_info = nilfs;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001048
Ryusuke Konishif7545142011-03-09 11:05:08 +09001049 err = init_nilfs(nilfs, sb, (char *)data);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001050 if (err)
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001051 goto failed_nilfs;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001052
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001053 sb->s_op = &nilfs_sops;
1054 sb->s_export_op = &nilfs_export_ops;
1055 sb->s_root = NULL;
Ryusuke Konishi61239232009-04-06 19:02:00 -07001056 sb->s_time_gran = 1;
Al Viro8de52772012-02-06 12:45:27 -05001057 sb->s_max_links = NILFS_LINK_MAX;
Ryusuke Konishi026a7d62010-10-07 14:19:48 +09001058
1059 bdi = sb->s_bdev->bd_inode->i_mapping->backing_dev_info;
1060 sb->s_bdi = bdi ? : &default_backing_dev_info;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001061
Ryusuke Konishif7545142011-03-09 11:05:08 +09001062 err = load_nilfs(nilfs, sb);
Ryusuke Konishif50a4c82009-11-19 16:58:40 +09001063 if (err)
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001064 goto failed_nilfs;
Ryusuke Konishif50a4c82009-11-19 16:58:40 +09001065
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001066 cno = nilfs_last_cno(nilfs);
Ryusuke Konishif7545142011-03-09 11:05:08 +09001067 err = nilfs_attach_checkpoint(sb, cno, true, &fsroot);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001068 if (err) {
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001069 printk(KERN_ERR "NILFS: error loading last checkpoint "
1070 "(checkpoint number=%llu).\n", (unsigned long long)cno);
Ryusuke Konishif1e89c82010-09-05 12:20:59 +09001071 goto failed_unload;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001072 }
1073
1074 if (!(sb->s_flags & MS_RDONLY)) {
Ryusuke Konishif7545142011-03-09 11:05:08 +09001075 err = nilfs_attach_log_writer(sb, fsroot);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001076 if (err)
1077 goto failed_checkpoint;
1078 }
1079
Ryusuke Konishi367ea332010-08-26 01:52:51 +09001080 err = nilfs_get_root_dentry(sb, fsroot, &sb->s_root);
1081 if (err)
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001082 goto failed_segctor;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001083
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +09001084 nilfs_put_root(fsroot);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001085
1086 if (!(sb->s_flags & MS_RDONLY)) {
1087 down_write(&nilfs->ns_sem);
Ryusuke Konishif7545142011-03-09 11:05:08 +09001088 nilfs_setup_super(sb, true);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001089 up_write(&nilfs->ns_sem);
1090 }
1091
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001092 return 0;
1093
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001094 failed_segctor:
Ryusuke Konishif7545142011-03-09 11:05:08 +09001095 nilfs_detach_log_writer(sb);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001096
1097 failed_checkpoint:
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +09001098 nilfs_put_root(fsroot);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001099
Ryusuke Konishif1e89c82010-09-05 12:20:59 +09001100 failed_unload:
1101 iput(nilfs->ns_sufile);
1102 iput(nilfs->ns_cpfile);
1103 iput(nilfs->ns_dat);
1104
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001105 failed_nilfs:
1106 destroy_nilfs(nilfs);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001107 return err;
1108}
1109
1110static int nilfs_remount(struct super_block *sb, int *flags, char *data)
1111{
Ryusuke Konishie3154e92011-03-09 11:05:08 +09001112 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001113 unsigned long old_sb_flags;
Ryusuke Konishi06df0f92010-12-27 00:04:06 +09001114 unsigned long old_mount_opt;
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001115 int err;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001116
1117 old_sb_flags = sb->s_flags;
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +09001118 old_mount_opt = nilfs->ns_mount_opt;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001119
Ryusuke Konishi7c017452010-07-05 20:08:33 +09001120 if (!parse_options(data, sb, 1)) {
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001121 err = -EINVAL;
1122 goto restore_opts;
1123 }
1124 sb->s_flags = (sb->s_flags & ~MS_POSIXACL);
1125
Ryusuke Konishid240e062010-05-09 21:51:53 +09001126 err = -EINVAL;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001127
Ryusuke Konishi02345762009-11-20 03:28:01 +09001128 if (!nilfs_valid_fs(nilfs)) {
1129 printk(KERN_WARNING "NILFS (device %s): couldn't "
1130 "remount because the filesystem is in an "
1131 "incomplete recovery state.\n", sb->s_id);
Ryusuke Konishi02345762009-11-20 03:28:01 +09001132 goto restore_opts;
1133 }
1134
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001135 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
1136 goto out;
1137 if (*flags & MS_RDONLY) {
Ryusuke Konishif7545142011-03-09 11:05:08 +09001138 /* Shutting down log writer */
1139 nilfs_detach_log_writer(sb);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001140 sb->s_flags |= MS_RDONLY;
1141
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001142 /*
1143 * Remounting a valid RW partition RDONLY, so set
1144 * the RDONLY flag and then mark the partition as valid again.
1145 */
1146 down_write(&nilfs->ns_sem);
Ryusuke Konishif7545142011-03-09 11:05:08 +09001147 nilfs_cleanup_super(sb);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001148 up_write(&nilfs->ns_sem);
1149 } else {
Ryusuke Konishic5ca48a2010-07-22 03:22:20 +09001150 __u64 features;
Ryusuke Konishie912a5b2010-08-14 13:07:15 +09001151 struct nilfs_root *root;
Ryusuke Konishic5ca48a2010-07-22 03:22:20 +09001152
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001153 /*
1154 * Mounting a RDONLY partition read-write, so reread and
1155 * store the current valid flag. (It may have been changed
1156 * by fsck since we originally mounted the partition.)
1157 */
Ryusuke Konishic5ca48a2010-07-22 03:22:20 +09001158 down_read(&nilfs->ns_sem);
1159 features = le64_to_cpu(nilfs->ns_sbp[0]->s_feature_compat_ro) &
1160 ~NILFS_FEATURE_COMPAT_RO_SUPP;
1161 up_read(&nilfs->ns_sem);
1162 if (features) {
1163 printk(KERN_WARNING "NILFS (device %s): couldn't "
1164 "remount RDWR because of unsupported optional "
1165 "features (%llx)\n",
1166 sb->s_id, (unsigned long long)features);
1167 err = -EROFS;
1168 goto restore_opts;
1169 }
1170
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001171 sb->s_flags &= ~MS_RDONLY;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001172
Ryusuke Konishie912a5b2010-08-14 13:07:15 +09001173 root = NILFS_I(sb->s_root->d_inode)->i_root;
Ryusuke Konishif7545142011-03-09 11:05:08 +09001174 err = nilfs_attach_log_writer(sb, root);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001175 if (err)
Ryusuke Konishie59399d2009-06-08 01:39:32 +09001176 goto restore_opts;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001177
1178 down_write(&nilfs->ns_sem);
Ryusuke Konishif7545142011-03-09 11:05:08 +09001179 nilfs_setup_super(sb, true);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001180 up_write(&nilfs->ns_sem);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001181 }
1182 out:
1183 return 0;
1184
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001185 restore_opts:
1186 sb->s_flags = old_sb_flags;
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +09001187 nilfs->ns_mount_opt = old_mount_opt;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001188 return err;
1189}
1190
1191struct nilfs_super_data {
1192 struct block_device *bdev;
1193 __u64 cno;
1194 int flags;
1195};
1196
1197/**
1198 * nilfs_identify - pre-read mount options needed to identify mount instance
1199 * @data: mount options
1200 * @sd: nilfs_super_data
1201 */
1202static int nilfs_identify(char *data, struct nilfs_super_data *sd)
1203{
1204 char *p, *options = data;
1205 substring_t args[MAX_OPT_ARGS];
Ryusuke Konishic05dbfc2010-09-16 00:36:24 +09001206 int token;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001207 int ret = 0;
1208
1209 do {
1210 p = strsep(&options, ",");
1211 if (p != NULL && *p) {
1212 token = match_token(p, tokens, args);
1213 if (token == Opt_snapshot) {
Ryusuke Konishic05dbfc2010-09-16 00:36:24 +09001214 if (!(sd->flags & MS_RDONLY)) {
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001215 ret++;
Ryusuke Konishic05dbfc2010-09-16 00:36:24 +09001216 } else {
1217 sd->cno = simple_strtoull(args[0].from,
1218 NULL, 0);
1219 /*
1220 * No need to see the end pointer;
1221 * match_token() has done syntax
1222 * checking.
1223 */
1224 if (sd->cno == 0)
1225 ret++;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001226 }
1227 }
1228 if (ret)
1229 printk(KERN_ERR
1230 "NILFS: invalid mount option: %s\n", p);
1231 }
1232 if (!options)
1233 break;
1234 BUG_ON(options == data);
1235 *(options - 1) = ',';
1236 } while (!ret);
1237 return ret;
1238}
1239
1240static int nilfs_set_bdev_super(struct super_block *s, void *data)
1241{
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001242 s->s_bdev = data;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001243 s->s_dev = s->s_bdev->bd_dev;
1244 return 0;
1245}
1246
1247static int nilfs_test_bdev_super(struct super_block *s, void *data)
1248{
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001249 return (void *)s->s_bdev == data;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001250}
1251
Al Viroe4c59d62010-07-26 12:19:34 +04001252static struct dentry *
1253nilfs_mount(struct file_system_type *fs_type, int flags,
1254 const char *dev_name, void *data)
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001255{
1256 struct nilfs_super_data sd;
Ryusuke Konishi33c8e572009-06-08 01:39:29 +09001257 struct super_block *s;
Tejun Heod4d77622010-11-13 11:55:18 +01001258 fmode_t mode = FMODE_READ | FMODE_EXCL;
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001259 struct dentry *root_dentry;
1260 int err, s_new = false;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001261
Ryusuke Konishi13e90552010-05-09 02:57:57 +09001262 if (!(flags & MS_RDONLY))
1263 mode |= FMODE_WRITE;
1264
Tejun Heod4d77622010-11-13 11:55:18 +01001265 sd.bdev = blkdev_get_by_path(dev_name, mode, fs_type);
Jan Blunckd6d4c192010-02-24 13:25:32 +01001266 if (IS_ERR(sd.bdev))
Al Viroe4c59d62010-07-26 12:19:34 +04001267 return ERR_CAST(sd.bdev);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001268
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001269 sd.cno = 0;
1270 sd.flags = flags;
1271 if (nilfs_identify((char *)data, &sd)) {
1272 err = -EINVAL;
1273 goto failed;
1274 }
1275
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +09001276 /*
1277 * once the super is inserted into the list by sget, s_umount
1278 * will protect the lockfs code from trying to start a snapshot
1279 * while we are mounting
1280 */
1281 mutex_lock(&sd.bdev->bd_fsfreeze_mutex);
1282 if (sd.bdev->bd_fsfreeze_count > 0) {
1283 mutex_unlock(&sd.bdev->bd_fsfreeze_mutex);
1284 err = -EBUSY;
Ryusuke Konishi33c8e572009-06-08 01:39:29 +09001285 goto failed;
1286 }
David Howells9249e172012-06-25 12:55:37 +01001287 s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, flags,
1288 sd.bdev);
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +09001289 mutex_unlock(&sd.bdev->bd_fsfreeze_mutex);
Ryusuke Konishi33c8e572009-06-08 01:39:29 +09001290 if (IS_ERR(s)) {
1291 err = PTR_ERR(s);
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001292 goto failed;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001293 }
1294
1295 if (!s->s_root) {
1296 char b[BDEVNAME_SIZE];
1297
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001298 s_new = true;
1299
Ryusuke Konishi33c8e572009-06-08 01:39:29 +09001300 /* New superblock instance created */
Ryusuke Konishi4571b822010-05-09 03:01:32 +09001301 s->s_mode = mode;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001302 strlcpy(s->s_id, bdevname(sd.bdev, b), sizeof(s->s_id));
1303 sb_set_blocksize(s, block_size(sd.bdev));
1304
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001305 err = nilfs_fill_super(s, data, flags & MS_SILENT ? 1 : 0);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001306 if (err)
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001307 goto failed_super;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001308
1309 s->s_flags |= MS_ACTIVE;
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001310 } else if (!sd.cno) {
1311 int busy = false;
1312
1313 if (nilfs_tree_was_touched(s->s_root)) {
1314 busy = nilfs_try_to_shrink_tree(s->s_root);
1315 if (busy && (flags ^ s->s_flags) & MS_RDONLY) {
1316 printk(KERN_ERR "NILFS: the device already "
1317 "has a %s mount.\n",
1318 (s->s_flags & MS_RDONLY) ?
1319 "read-only" : "read/write");
1320 err = -EBUSY;
1321 goto failed_super;
1322 }
1323 }
1324 if (!busy) {
1325 /*
1326 * Try remount to setup mount states if the current
1327 * tree is not mounted and only snapshots use this sb.
1328 */
1329 err = nilfs_remount(s, &flags, data);
1330 if (err)
1331 goto failed_super;
1332 }
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001333 }
1334
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001335 if (sd.cno) {
1336 err = nilfs_attach_snapshot(s, sd.cno, &root_dentry);
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001337 if (err)
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001338 goto failed_super;
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001339 } else {
1340 root_dentry = dget(s->s_root);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001341 }
1342
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001343 if (!s_new)
Tejun Heod4d77622010-11-13 11:55:18 +01001344 blkdev_put(sd.bdev, mode);
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001345
Al Viroe4c59d62010-07-26 12:19:34 +04001346 return root_dentry;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001347
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001348 failed_super:
Al Viroa95161a2009-08-09 00:52:02 +04001349 deactivate_locked_super(s);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001350
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001351 failed:
1352 if (!s_new)
Tejun Heod4d77622010-11-13 11:55:18 +01001353 blkdev_put(sd.bdev, mode);
Al Viroe4c59d62010-07-26 12:19:34 +04001354 return ERR_PTR(err);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001355}
1356
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001357struct file_system_type nilfs_fs_type = {
1358 .owner = THIS_MODULE,
1359 .name = "nilfs2",
Al Viroe4c59d62010-07-26 12:19:34 +04001360 .mount = nilfs_mount,
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001361 .kill_sb = kill_block_super,
1362 .fs_flags = FS_REQUIRES_DEV,
1363};
1364
Li Hong41c88bd2010-04-06 00:54:11 +08001365static void nilfs_inode_init_once(void *obj)
1366{
1367 struct nilfs_inode_info *ii = obj;
1368
1369 INIT_LIST_HEAD(&ii->i_dirty);
1370#ifdef CONFIG_NILFS_XATTR
1371 init_rwsem(&ii->xattr_sem);
1372#endif
Miklos Szeredi2aa15892011-02-23 13:49:47 +01001373 address_space_init_once(&ii->i_btnode_cache);
Ryusuke Konishi05d0e942010-07-10 20:52:09 +09001374 ii->i_bmap = &ii->i_bmap_data;
Li Hong41c88bd2010-04-06 00:54:11 +08001375 inode_init_once(&ii->vfs_inode);
1376}
1377
1378static void nilfs_segbuf_init_once(void *obj)
1379{
1380 memset(obj, 0, sizeof(struct nilfs_segment_buffer));
1381}
1382
1383static void nilfs_destroy_cachep(void)
1384{
Kirill A. Shutemov8c0a8532012-09-26 11:33:07 +10001385 /*
1386 * Make sure all delayed rcu free inodes are flushed before we
1387 * destroy cache.
1388 */
1389 rcu_barrier();
1390
Ryusuke Konishi84cb0992010-05-22 12:49:32 +09001391 if (nilfs_inode_cachep)
Li Hong41c88bd2010-04-06 00:54:11 +08001392 kmem_cache_destroy(nilfs_inode_cachep);
Ryusuke Konishi84cb0992010-05-22 12:49:32 +09001393 if (nilfs_transaction_cachep)
Li Hong41c88bd2010-04-06 00:54:11 +08001394 kmem_cache_destroy(nilfs_transaction_cachep);
Ryusuke Konishi84cb0992010-05-22 12:49:32 +09001395 if (nilfs_segbuf_cachep)
Li Hong41c88bd2010-04-06 00:54:11 +08001396 kmem_cache_destroy(nilfs_segbuf_cachep);
Ryusuke Konishi84cb0992010-05-22 12:49:32 +09001397 if (nilfs_btree_path_cache)
Li Hong41c88bd2010-04-06 00:54:11 +08001398 kmem_cache_destroy(nilfs_btree_path_cache);
1399}
1400
1401static int __init nilfs_init_cachep(void)
1402{
1403 nilfs_inode_cachep = kmem_cache_create("nilfs2_inode_cache",
1404 sizeof(struct nilfs_inode_info), 0,
1405 SLAB_RECLAIM_ACCOUNT, nilfs_inode_init_once);
1406 if (!nilfs_inode_cachep)
1407 goto fail;
1408
1409 nilfs_transaction_cachep = kmem_cache_create("nilfs2_transaction_cache",
1410 sizeof(struct nilfs_transaction_info), 0,
1411 SLAB_RECLAIM_ACCOUNT, NULL);
1412 if (!nilfs_transaction_cachep)
1413 goto fail;
1414
1415 nilfs_segbuf_cachep = kmem_cache_create("nilfs2_segbuf_cache",
1416 sizeof(struct nilfs_segment_buffer), 0,
1417 SLAB_RECLAIM_ACCOUNT, nilfs_segbuf_init_once);
1418 if (!nilfs_segbuf_cachep)
1419 goto fail;
1420
1421 nilfs_btree_path_cache = kmem_cache_create("nilfs2_btree_path_cache",
1422 sizeof(struct nilfs_btree_path) * NILFS_BTREE_LEVEL_MAX,
1423 0, 0, NULL);
1424 if (!nilfs_btree_path_cache)
1425 goto fail;
1426
1427 return 0;
1428
1429fail:
1430 nilfs_destroy_cachep();
1431 return -ENOMEM;
1432}
1433
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001434static int __init init_nilfs_fs(void)
1435{
1436 int err;
1437
Li Hong41c88bd2010-04-06 00:54:11 +08001438 err = nilfs_init_cachep();
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001439 if (err)
Li Hong41c88bd2010-04-06 00:54:11 +08001440 goto fail;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001441
1442 err = register_filesystem(&nilfs_fs_type);
1443 if (err)
Li Hong41c88bd2010-04-06 00:54:11 +08001444 goto free_cachep;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001445
Li Hong9f130262010-04-09 23:09:53 +08001446 printk(KERN_INFO "NILFS version 2 loaded\n");
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001447 return 0;
1448
Li Hong41c88bd2010-04-06 00:54:11 +08001449free_cachep:
1450 nilfs_destroy_cachep();
1451fail:
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001452 return err;
1453}
1454
1455static void __exit exit_nilfs_fs(void)
1456{
Li Hong41c88bd2010-04-06 00:54:11 +08001457 nilfs_destroy_cachep();
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001458 unregister_filesystem(&nilfs_fs_type);
1459}
1460
1461module_init(init_nilfs_fs)
1462module_exit(exit_nilfs_fs)