blob: af3ba0478cdf5d7acedd8fba777f9217ae00f986 [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
Vyacheslav Dubeykoe5f7f842013-07-03 15:08:06 -0700557 atomic64_set(&root->inodes_count,
558 le64_to_cpu(raw_cp->cp_inodes_count));
559 atomic64_set(&root->blocks_count,
560 le64_to_cpu(raw_cp->cp_blocks_count));
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700561
562 nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp);
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900563
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900564 reuse:
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900565 *rootp = root;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700566 return 0;
567
568 failed_bh:
569 nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp);
570 failed:
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900571 nilfs_put_root(root);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700572
573 return err;
574}
575
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900576static int nilfs_freeze(struct super_block *sb)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700577{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900578 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900579 int err;
580
581 if (sb->s_flags & MS_RDONLY)
582 return 0;
583
584 /* Mark super block clean */
585 down_write(&nilfs->ns_sem);
Ryusuke Konishif7545142011-03-09 11:05:08 +0900586 err = nilfs_cleanup_super(sb);
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900587 up_write(&nilfs->ns_sem);
588 return err;
589}
590
591static int nilfs_unfreeze(struct super_block *sb)
592{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900593 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700594
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900595 if (sb->s_flags & MS_RDONLY)
596 return 0;
597
598 down_write(&nilfs->ns_sem);
Ryusuke Konishif7545142011-03-09 11:05:08 +0900599 nilfs_setup_super(sb, false);
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900600 up_write(&nilfs->ns_sem);
601 return 0;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700602}
603
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700604static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf)
605{
606 struct super_block *sb = dentry->d_sb;
Ryusuke Konishib7c06342010-08-14 14:48:32 +0900607 struct nilfs_root *root = NILFS_I(dentry->d_inode)->i_root;
608 struct the_nilfs *nilfs = root->nilfs;
Ryusuke Konishic306af22009-03-26 10:16:57 +0900609 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700610 unsigned long long blocks;
611 unsigned long overhead;
612 unsigned long nrsvblocks;
613 sector_t nfreeblocks;
Vyacheslav Dubeykoc7ef9722013-07-03 15:08:05 -0700614 u64 nmaxinodes, nfreeinodes;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700615 int err;
616
617 /*
618 * Compute all of the segment blocks
619 *
620 * The blocks before first segment and after last segment
621 * are excluded.
622 */
623 blocks = nilfs->ns_blocks_per_segment * nilfs->ns_nsegments
624 - nilfs->ns_first_data_block;
625 nrsvblocks = nilfs->ns_nrsvsegs * nilfs->ns_blocks_per_segment;
626
627 /*
628 * Compute the overhead
629 *
Ryusuke Konishi7a650042010-03-14 03:32:40 +0900630 * When distributing meta data blocks outside segment structure,
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700631 * We must count them as the overhead.
632 */
633 overhead = 0;
634
635 err = nilfs_count_free_blocks(nilfs, &nfreeblocks);
636 if (unlikely(err))
637 return err;
638
Vyacheslav Dubeykoc7ef9722013-07-03 15:08:05 -0700639 err = nilfs_ifile_count_free_inodes(root->ifile,
640 &nmaxinodes, &nfreeinodes);
641 if (unlikely(err)) {
642 printk(KERN_WARNING
643 "NILFS warning: fail to count free inodes: err %d.\n",
644 err);
645 if (err == -ERANGE) {
646 /*
647 * If nilfs_palloc_count_max_entries() returns
648 * -ERANGE error code then we simply treat
649 * curent inodes count as maximum possible and
650 * zero as free inodes value.
651 */
Vyacheslav Dubeykoe5f7f842013-07-03 15:08:06 -0700652 nmaxinodes = atomic64_read(&root->inodes_count);
Vyacheslav Dubeykoc7ef9722013-07-03 15:08:05 -0700653 nfreeinodes = 0;
654 err = 0;
655 } else
656 return err;
657 }
658
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700659 buf->f_type = NILFS_SUPER_MAGIC;
660 buf->f_bsize = sb->s_blocksize;
661 buf->f_blocks = blocks - overhead;
662 buf->f_bfree = nfreeblocks;
663 buf->f_bavail = (buf->f_bfree >= nrsvblocks) ?
664 (buf->f_bfree - nrsvblocks) : 0;
Vyacheslav Dubeykoc7ef9722013-07-03 15:08:05 -0700665 buf->f_files = nmaxinodes;
666 buf->f_ffree = nfreeinodes;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700667 buf->f_namelen = NILFS_NAME_LEN;
Ryusuke Konishic306af22009-03-26 10:16:57 +0900668 buf->f_fsid.val[0] = (u32)id;
669 buf->f_fsid.val[1] = (u32)(id >> 32);
670
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700671 return 0;
672}
673
Al Viro34c80b12011-12-08 21:32:45 -0500674static int nilfs_show_options(struct seq_file *seq, struct dentry *dentry)
Jiro SEKIBAb58a2852009-06-24 20:06:34 +0900675{
Al Viro34c80b12011-12-08 21:32:45 -0500676 struct super_block *sb = dentry->d_sb;
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900677 struct the_nilfs *nilfs = sb->s_fs_info;
Al Viro34c80b12011-12-08 21:32:45 -0500678 struct nilfs_root *root = NILFS_I(dentry->d_inode)->i_root;
Jiro SEKIBAb58a2852009-06-24 20:06:34 +0900679
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900680 if (!nilfs_test_opt(nilfs, BARRIER))
Ryusuke Konishic6b4d572010-07-05 14:40:27 +0900681 seq_puts(seq, ",nobarrier");
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900682 if (root->cno != NILFS_CPTREE_CURRENT_CNO)
683 seq_printf(seq, ",cp=%llu", (unsigned long long)root->cno);
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900684 if (nilfs_test_opt(nilfs, ERRORS_PANIC))
Ryusuke Konishic6b4d572010-07-05 14:40:27 +0900685 seq_puts(seq, ",errors=panic");
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900686 if (nilfs_test_opt(nilfs, ERRORS_CONT))
Ryusuke Konishic6b4d572010-07-05 14:40:27 +0900687 seq_puts(seq, ",errors=continue");
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900688 if (nilfs_test_opt(nilfs, STRICT_ORDER))
Ryusuke Konishic6b4d572010-07-05 14:40:27 +0900689 seq_puts(seq, ",order=strict");
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900690 if (nilfs_test_opt(nilfs, NORECOVERY))
Ryusuke Konishic6b4d572010-07-05 14:40:27 +0900691 seq_puts(seq, ",norecovery");
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900692 if (nilfs_test_opt(nilfs, DISCARD))
Ryusuke Konishic6b4d572010-07-05 14:40:27 +0900693 seq_puts(seq, ",discard");
Jiro SEKIBAb58a2852009-06-24 20:06:34 +0900694
695 return 0;
696}
697
Alexey Dobriyanb87221d2009-09-21 17:01:09 -0700698static const struct super_operations nilfs_sops = {
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700699 .alloc_inode = nilfs_alloc_inode,
700 .destroy_inode = nilfs_destroy_inode,
701 .dirty_inode = nilfs_dirty_inode,
Al Viro6fd1e5c2010-06-07 11:55:00 -0400702 .evict_inode = nilfs_evict_inode,
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700703 .put_super = nilfs_put_super,
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700704 .sync_fs = nilfs_sync_fs,
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900705 .freeze_fs = nilfs_freeze,
706 .unfreeze_fs = nilfs_unfreeze,
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700707 .statfs = nilfs_statfs,
708 .remount_fs = nilfs_remount,
Jiro SEKIBAb58a2852009-06-24 20:06:34 +0900709 .show_options = nilfs_show_options
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700710};
711
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700712enum {
713 Opt_err_cont, Opt_err_panic, Opt_err_ro,
Ryusuke Konishi773bc4f2010-07-05 13:00:08 +0900714 Opt_barrier, Opt_nobarrier, Opt_snapshot, Opt_order, Opt_norecovery,
Ryusuke Konishi802d3172010-07-05 14:27:04 +0900715 Opt_discard, Opt_nodiscard, Opt_err,
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700716};
717
718static match_table_t tokens = {
719 {Opt_err_cont, "errors=continue"},
720 {Opt_err_panic, "errors=panic"},
721 {Opt_err_ro, "errors=remount-ro"},
Ryusuke Konishi773bc4f2010-07-05 13:00:08 +0900722 {Opt_barrier, "barrier"},
Jiro SEKIBA91f19532009-11-12 14:07:26 +0900723 {Opt_nobarrier, "nobarrier"},
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700724 {Opt_snapshot, "cp=%u"},
725 {Opt_order, "order=%s"},
Ryusuke Konishi02345762009-11-20 03:28:01 +0900726 {Opt_norecovery, "norecovery"},
Jiro SEKIBAe902ec92010-01-30 18:06:35 +0900727 {Opt_discard, "discard"},
Ryusuke Konishi802d3172010-07-05 14:27:04 +0900728 {Opt_nodiscard, "nodiscard"},
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700729 {Opt_err, NULL}
730};
731
Ryusuke Konishi7c017452010-07-05 20:08:33 +0900732static int parse_options(char *options, struct super_block *sb, int is_remount)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700733{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900734 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700735 char *p;
736 substring_t args[MAX_OPT_ARGS];
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700737
738 if (!options)
739 return 1;
740
741 while ((p = strsep(&options, ",")) != NULL) {
742 int token;
743 if (!*p)
744 continue;
745
746 token = match_token(p, tokens, args);
747 switch (token) {
Ryusuke Konishi773bc4f2010-07-05 13:00:08 +0900748 case Opt_barrier:
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900749 nilfs_set_opt(nilfs, BARRIER);
Ryusuke Konishi773bc4f2010-07-05 13:00:08 +0900750 break;
Jiro SEKIBA91f19532009-11-12 14:07:26 +0900751 case Opt_nobarrier:
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900752 nilfs_clear_opt(nilfs, BARRIER);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700753 break;
754 case Opt_order:
755 if (strcmp(args[0].from, "relaxed") == 0)
756 /* Ordered data semantics */
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900757 nilfs_clear_opt(nilfs, STRICT_ORDER);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700758 else if (strcmp(args[0].from, "strict") == 0)
759 /* Strict in-order semantics */
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900760 nilfs_set_opt(nilfs, STRICT_ORDER);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700761 else
762 return 0;
763 break;
764 case Opt_err_panic:
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900765 nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_PANIC);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700766 break;
767 case Opt_err_ro:
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900768 nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_RO);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700769 break;
770 case Opt_err_cont:
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900771 nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_CONT);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700772 break;
773 case Opt_snapshot:
Ryusuke Konishi7c017452010-07-05 20:08:33 +0900774 if (is_remount) {
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900775 printk(KERN_ERR
776 "NILFS: \"%s\" option is invalid "
777 "for remount.\n", p);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700778 return 0;
Ryusuke Konishi7c017452010-07-05 20:08:33 +0900779 }
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700780 break;
Ryusuke Konishi02345762009-11-20 03:28:01 +0900781 case Opt_norecovery:
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900782 nilfs_set_opt(nilfs, NORECOVERY);
Ryusuke Konishi02345762009-11-20 03:28:01 +0900783 break;
Jiro SEKIBAe902ec92010-01-30 18:06:35 +0900784 case Opt_discard:
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900785 nilfs_set_opt(nilfs, DISCARD);
Jiro SEKIBAe902ec92010-01-30 18:06:35 +0900786 break;
Ryusuke Konishi802d3172010-07-05 14:27:04 +0900787 case Opt_nodiscard:
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900788 nilfs_clear_opt(nilfs, DISCARD);
Ryusuke Konishi802d3172010-07-05 14:27:04 +0900789 break;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700790 default:
791 printk(KERN_ERR
792 "NILFS: Unrecognized mount option \"%s\"\n", p);
793 return 0;
794 }
795 }
796 return 1;
797}
798
799static inline void
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900800nilfs_set_default_options(struct super_block *sb,
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700801 struct nilfs_super_block *sbp)
802{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900803 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900804
805 nilfs->ns_mount_opt =
Ryusuke Konishi277a6a32010-04-02 18:02:33 +0900806 NILFS_MOUNT_ERRORS_RO | NILFS_MOUNT_BARRIER;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700807}
808
Ryusuke Konishif7545142011-03-09 11:05:08 +0900809static int nilfs_setup_super(struct super_block *sb, int is_mount)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700810{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900811 struct the_nilfs *nilfs = sb->s_fs_info;
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900812 struct nilfs_super_block **sbp;
813 int max_mnt_count;
814 int mnt_count;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700815
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900816 /* nilfs->ns_sem must be locked by the caller. */
Ryusuke Konishif7545142011-03-09 11:05:08 +0900817 sbp = nilfs_prepare_super(sb, 0);
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900818 if (!sbp)
819 return -EIO;
820
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900821 if (!is_mount)
822 goto skip_mount_setup;
823
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900824 max_mnt_count = le16_to_cpu(sbp[0]->s_max_mnt_count);
825 mnt_count = le16_to_cpu(sbp[0]->s_mnt_count);
826
Ryusuke Konishif50a4c82009-11-19 16:58:40 +0900827 if (nilfs->ns_mount_state & NILFS_ERROR_FS) {
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700828 printk(KERN_WARNING
829 "NILFS warning: mounting fs with errors\n");
830#if 0
831 } else if (max_mnt_count >= 0 && mnt_count >= max_mnt_count) {
832 printk(KERN_WARNING
833 "NILFS warning: maximal mount count reached\n");
834#endif
835 }
836 if (!max_mnt_count)
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900837 sbp[0]->s_max_mnt_count = cpu_to_le16(NILFS_DFL_MAX_MNT_COUNT);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700838
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900839 sbp[0]->s_mnt_count = cpu_to_le16(mnt_count + 1);
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900840 sbp[0]->s_mtime = cpu_to_le64(get_seconds());
841
842skip_mount_setup:
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900843 sbp[0]->s_state =
844 cpu_to_le16(le16_to_cpu(sbp[0]->s_state) & ~NILFS_VALID_FS);
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900845 /* synchronize sbp[1] with sbp[0] */
Ryusuke Konishi0ca7a5b2011-01-21 16:40:31 +0900846 if (sbp[1])
847 memcpy(sbp[1], sbp[0], nilfs->ns_sbsize);
Ryusuke Konishif7545142011-03-09 11:05:08 +0900848 return nilfs_commit_super(sb, NILFS_SB_COMMIT_ALL);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700849}
850
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700851struct nilfs_super_block *nilfs_read_super_block(struct super_block *sb,
852 u64 pos, int blocksize,
853 struct buffer_head **pbh)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700854{
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700855 unsigned long long sb_index = pos;
856 unsigned long offset;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700857
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700858 offset = do_div(sb_index, blocksize);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700859 *pbh = sb_bread(sb, sb_index);
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700860 if (!*pbh)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700861 return NULL;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700862 return (struct nilfs_super_block *)((char *)(*pbh)->b_data + offset);
863}
864
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700865int nilfs_store_magic_and_option(struct super_block *sb,
866 struct nilfs_super_block *sbp,
867 char *data)
868{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900869 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700870
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700871 sb->s_magic = le16_to_cpu(sbp->s_magic);
872
873 /* FS independent flags */
874#ifdef NILFS_ATIME_DISABLE
875 sb->s_flags |= MS_NOATIME;
876#endif
877
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900878 nilfs_set_default_options(sb, sbp);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700879
Ryusuke Konishi574e6c32011-03-09 11:05:07 +0900880 nilfs->ns_resuid = le16_to_cpu(sbp->s_def_resuid);
881 nilfs->ns_resgid = le16_to_cpu(sbp->s_def_resgid);
882 nilfs->ns_interval = le32_to_cpu(sbp->s_c_interval);
883 nilfs->ns_watermark = le32_to_cpu(sbp->s_c_block_max);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700884
Ryusuke Konishi7c017452010-07-05 20:08:33 +0900885 return !parse_options(data, sb, 0) ? -EINVAL : 0 ;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700886}
887
Ryusuke Konishic5ca48a2010-07-22 03:22:20 +0900888int nilfs_check_feature_compatibility(struct super_block *sb,
889 struct nilfs_super_block *sbp)
890{
891 __u64 features;
892
893 features = le64_to_cpu(sbp->s_feature_incompat) &
894 ~NILFS_FEATURE_INCOMPAT_SUPP;
895 if (features) {
896 printk(KERN_ERR "NILFS: couldn't mount because of unsupported "
897 "optional features (%llx)\n",
898 (unsigned long long)features);
899 return -EINVAL;
900 }
901 features = le64_to_cpu(sbp->s_feature_compat_ro) &
902 ~NILFS_FEATURE_COMPAT_RO_SUPP;
903 if (!(sb->s_flags & MS_RDONLY) && features) {
904 printk(KERN_ERR "NILFS: couldn't mount RDWR because of "
905 "unsupported optional features (%llx)\n",
906 (unsigned long long)features);
907 return -EINVAL;
908 }
909 return 0;
910}
911
Ryusuke Konishi367ea332010-08-26 01:52:51 +0900912static int nilfs_get_root_dentry(struct super_block *sb,
913 struct nilfs_root *root,
914 struct dentry **root_dentry)
915{
916 struct inode *inode;
917 struct dentry *dentry;
918 int ret = 0;
919
920 inode = nilfs_iget(sb, root, NILFS_ROOT_INO);
921 if (IS_ERR(inode)) {
922 printk(KERN_ERR "NILFS: get root inode failed\n");
923 ret = PTR_ERR(inode);
924 goto out;
925 }
926 if (!S_ISDIR(inode->i_mode) || !inode->i_blocks || !inode->i_size) {
927 iput(inode);
928 printk(KERN_ERR "NILFS: corrupt root inode.\n");
929 ret = -EINVAL;
930 goto out;
931 }
932
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900933 if (root->cno == NILFS_CPTREE_CURRENT_CNO) {
934 dentry = d_find_alias(inode);
935 if (!dentry) {
Al Viro48fde702012-01-08 22:15:13 -0500936 dentry = d_make_root(inode);
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900937 if (!dentry) {
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900938 ret = -ENOMEM;
939 goto failed_dentry;
940 }
941 } else {
942 iput(inode);
943 }
944 } else {
945 dentry = d_obtain_alias(inode);
946 if (IS_ERR(dentry)) {
947 ret = PTR_ERR(dentry);
948 goto failed_dentry;
949 }
Ryusuke Konishi367ea332010-08-26 01:52:51 +0900950 }
951 *root_dentry = dentry;
952 out:
953 return ret;
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900954
955 failed_dentry:
956 printk(KERN_ERR "NILFS: get root dentry failed\n");
957 goto out;
Ryusuke Konishi367ea332010-08-26 01:52:51 +0900958}
959
Ryusuke Konishiab4d8f72010-08-26 02:15:41 +0900960static int nilfs_attach_snapshot(struct super_block *s, __u64 cno,
961 struct dentry **root_dentry)
962{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900963 struct the_nilfs *nilfs = s->s_fs_info;
Ryusuke Konishiab4d8f72010-08-26 02:15:41 +0900964 struct nilfs_root *root;
965 int ret;
966
Ryusuke Konishi572d8b32012-07-30 14:42:07 -0700967 mutex_lock(&nilfs->ns_snapshot_mount_mutex);
968
Ryusuke Konishiab4d8f72010-08-26 02:15:41 +0900969 down_read(&nilfs->ns_segctor_sem);
970 ret = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile, cno);
971 up_read(&nilfs->ns_segctor_sem);
972 if (ret < 0) {
973 ret = (ret == -ENOENT) ? -EINVAL : ret;
974 goto out;
975 } else if (!ret) {
976 printk(KERN_ERR "NILFS: The specified checkpoint is "
977 "not a snapshot (checkpoint number=%llu).\n",
978 (unsigned long long)cno);
979 ret = -EINVAL;
980 goto out;
981 }
982
Ryusuke Konishif7545142011-03-09 11:05:08 +0900983 ret = nilfs_attach_checkpoint(s, cno, false, &root);
Ryusuke Konishiab4d8f72010-08-26 02:15:41 +0900984 if (ret) {
985 printk(KERN_ERR "NILFS: error loading snapshot "
986 "(checkpoint number=%llu).\n",
987 (unsigned long long)cno);
988 goto out;
989 }
990 ret = nilfs_get_root_dentry(s, root, root_dentry);
991 nilfs_put_root(root);
992 out:
Ryusuke Konishi572d8b32012-07-30 14:42:07 -0700993 mutex_unlock(&nilfs->ns_snapshot_mount_mutex);
Ryusuke Konishiab4d8f72010-08-26 02:15:41 +0900994 return ret;
995}
996
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900997static int nilfs_tree_was_touched(struct dentry *root_dentry)
998{
Al Viro84d08fa2013-07-05 18:59:33 +0400999 return d_count(root_dentry) > 1;
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001000}
1001
1002/**
1003 * nilfs_try_to_shrink_tree() - try to shrink dentries of a checkpoint
1004 * @root_dentry: root dentry of the tree to be shrunk
1005 *
1006 * This function returns true if the tree was in-use.
1007 */
1008static int nilfs_try_to_shrink_tree(struct dentry *root_dentry)
1009{
1010 if (have_submounts(root_dentry))
1011 return true;
1012 shrink_dcache_parent(root_dentry);
1013 return nilfs_tree_was_touched(root_dentry);
1014}
1015
Ryusuke Konishi032dbb32010-09-13 11:16:34 +09001016int nilfs_checkpoint_is_mounted(struct super_block *sb, __u64 cno)
1017{
Ryusuke Konishie3154e92011-03-09 11:05:08 +09001018 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi032dbb32010-09-13 11:16:34 +09001019 struct nilfs_root *root;
1020 struct inode *inode;
1021 struct dentry *dentry;
1022 int ret;
1023
1024 if (cno < 0 || cno > nilfs->ns_cno)
1025 return false;
1026
1027 if (cno >= nilfs_last_cno(nilfs))
1028 return true; /* protect recent checkpoints */
1029
1030 ret = false;
Ryusuke Konishie3154e92011-03-09 11:05:08 +09001031 root = nilfs_lookup_root(nilfs, cno);
Ryusuke Konishi032dbb32010-09-13 11:16:34 +09001032 if (root) {
1033 inode = nilfs_ilookup(sb, root, NILFS_ROOT_INO);
1034 if (inode) {
1035 dentry = d_find_alias(inode);
1036 if (dentry) {
1037 if (nilfs_tree_was_touched(dentry))
1038 ret = nilfs_try_to_shrink_tree(dentry);
1039 dput(dentry);
1040 }
1041 iput(inode);
1042 }
1043 nilfs_put_root(root);
1044 }
1045 return ret;
1046}
1047
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001048/**
1049 * nilfs_fill_super() - initialize a super block instance
1050 * @sb: super_block
1051 * @data: mount options
1052 * @silent: silent mode flag
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001053 *
Ryusuke Konishiaa7dfb82009-06-08 01:39:33 +09001054 * This function is called exclusively by nilfs->ns_mount_mutex.
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001055 * So, the recovery process is protected from other simultaneous mounts.
1056 */
1057static int
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001058nilfs_fill_super(struct super_block *sb, void *data, int silent)
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001059{
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001060 struct the_nilfs *nilfs;
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +09001061 struct nilfs_root *fsroot;
Ryusuke Konishi026a7d62010-10-07 14:19:48 +09001062 struct backing_dev_info *bdi;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001063 __u64 cno;
1064 int err;
1065
Ryusuke Konishie3154e92011-03-09 11:05:08 +09001066 nilfs = alloc_nilfs(sb->s_bdev);
1067 if (!nilfs)
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001068 return -ENOMEM;
1069
Ryusuke Konishie3154e92011-03-09 11:05:08 +09001070 sb->s_fs_info = nilfs;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001071
Ryusuke Konishif7545142011-03-09 11:05:08 +09001072 err = init_nilfs(nilfs, sb, (char *)data);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001073 if (err)
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001074 goto failed_nilfs;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001075
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001076 sb->s_op = &nilfs_sops;
1077 sb->s_export_op = &nilfs_export_ops;
1078 sb->s_root = NULL;
Ryusuke Konishi61239232009-04-06 19:02:00 -07001079 sb->s_time_gran = 1;
Al Viro8de52772012-02-06 12:45:27 -05001080 sb->s_max_links = NILFS_LINK_MAX;
Ryusuke Konishi026a7d62010-10-07 14:19:48 +09001081
1082 bdi = sb->s_bdev->bd_inode->i_mapping->backing_dev_info;
1083 sb->s_bdi = bdi ? : &default_backing_dev_info;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001084
Ryusuke Konishif7545142011-03-09 11:05:08 +09001085 err = load_nilfs(nilfs, sb);
Ryusuke Konishif50a4c82009-11-19 16:58:40 +09001086 if (err)
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001087 goto failed_nilfs;
Ryusuke Konishif50a4c82009-11-19 16:58:40 +09001088
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001089 cno = nilfs_last_cno(nilfs);
Ryusuke Konishif7545142011-03-09 11:05:08 +09001090 err = nilfs_attach_checkpoint(sb, cno, true, &fsroot);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001091 if (err) {
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001092 printk(KERN_ERR "NILFS: error loading last checkpoint "
1093 "(checkpoint number=%llu).\n", (unsigned long long)cno);
Ryusuke Konishif1e89c82010-09-05 12:20:59 +09001094 goto failed_unload;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001095 }
1096
1097 if (!(sb->s_flags & MS_RDONLY)) {
Ryusuke Konishif7545142011-03-09 11:05:08 +09001098 err = nilfs_attach_log_writer(sb, fsroot);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001099 if (err)
1100 goto failed_checkpoint;
1101 }
1102
Ryusuke Konishi367ea332010-08-26 01:52:51 +09001103 err = nilfs_get_root_dentry(sb, fsroot, &sb->s_root);
1104 if (err)
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001105 goto failed_segctor;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001106
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +09001107 nilfs_put_root(fsroot);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001108
1109 if (!(sb->s_flags & MS_RDONLY)) {
1110 down_write(&nilfs->ns_sem);
Ryusuke Konishif7545142011-03-09 11:05:08 +09001111 nilfs_setup_super(sb, true);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001112 up_write(&nilfs->ns_sem);
1113 }
1114
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001115 return 0;
1116
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001117 failed_segctor:
Ryusuke Konishif7545142011-03-09 11:05:08 +09001118 nilfs_detach_log_writer(sb);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001119
1120 failed_checkpoint:
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +09001121 nilfs_put_root(fsroot);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001122
Ryusuke Konishif1e89c82010-09-05 12:20:59 +09001123 failed_unload:
1124 iput(nilfs->ns_sufile);
1125 iput(nilfs->ns_cpfile);
1126 iput(nilfs->ns_dat);
1127
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001128 failed_nilfs:
1129 destroy_nilfs(nilfs);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001130 return err;
1131}
1132
1133static int nilfs_remount(struct super_block *sb, int *flags, char *data)
1134{
Ryusuke Konishie3154e92011-03-09 11:05:08 +09001135 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001136 unsigned long old_sb_flags;
Ryusuke Konishi06df0f92010-12-27 00:04:06 +09001137 unsigned long old_mount_opt;
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001138 int err;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001139
1140 old_sb_flags = sb->s_flags;
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +09001141 old_mount_opt = nilfs->ns_mount_opt;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001142
Ryusuke Konishi7c017452010-07-05 20:08:33 +09001143 if (!parse_options(data, sb, 1)) {
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001144 err = -EINVAL;
1145 goto restore_opts;
1146 }
1147 sb->s_flags = (sb->s_flags & ~MS_POSIXACL);
1148
Ryusuke Konishid240e062010-05-09 21:51:53 +09001149 err = -EINVAL;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001150
Ryusuke Konishi02345762009-11-20 03:28:01 +09001151 if (!nilfs_valid_fs(nilfs)) {
1152 printk(KERN_WARNING "NILFS (device %s): couldn't "
1153 "remount because the filesystem is in an "
1154 "incomplete recovery state.\n", sb->s_id);
Ryusuke Konishi02345762009-11-20 03:28:01 +09001155 goto restore_opts;
1156 }
1157
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001158 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
1159 goto out;
1160 if (*flags & MS_RDONLY) {
Ryusuke Konishif7545142011-03-09 11:05:08 +09001161 /* Shutting down log writer */
1162 nilfs_detach_log_writer(sb);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001163 sb->s_flags |= MS_RDONLY;
1164
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001165 /*
1166 * Remounting a valid RW partition RDONLY, so set
1167 * the RDONLY flag and then mark the partition as valid again.
1168 */
1169 down_write(&nilfs->ns_sem);
Ryusuke Konishif7545142011-03-09 11:05:08 +09001170 nilfs_cleanup_super(sb);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001171 up_write(&nilfs->ns_sem);
1172 } else {
Ryusuke Konishic5ca48a2010-07-22 03:22:20 +09001173 __u64 features;
Ryusuke Konishie912a5b2010-08-14 13:07:15 +09001174 struct nilfs_root *root;
Ryusuke Konishic5ca48a2010-07-22 03:22:20 +09001175
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001176 /*
1177 * Mounting a RDONLY partition read-write, so reread and
1178 * store the current valid flag. (It may have been changed
1179 * by fsck since we originally mounted the partition.)
1180 */
Ryusuke Konishic5ca48a2010-07-22 03:22:20 +09001181 down_read(&nilfs->ns_sem);
1182 features = le64_to_cpu(nilfs->ns_sbp[0]->s_feature_compat_ro) &
1183 ~NILFS_FEATURE_COMPAT_RO_SUPP;
1184 up_read(&nilfs->ns_sem);
1185 if (features) {
1186 printk(KERN_WARNING "NILFS (device %s): couldn't "
1187 "remount RDWR because of unsupported optional "
1188 "features (%llx)\n",
1189 sb->s_id, (unsigned long long)features);
1190 err = -EROFS;
1191 goto restore_opts;
1192 }
1193
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001194 sb->s_flags &= ~MS_RDONLY;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001195
Ryusuke Konishie912a5b2010-08-14 13:07:15 +09001196 root = NILFS_I(sb->s_root->d_inode)->i_root;
Ryusuke Konishif7545142011-03-09 11:05:08 +09001197 err = nilfs_attach_log_writer(sb, root);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001198 if (err)
Ryusuke Konishie59399d2009-06-08 01:39:32 +09001199 goto restore_opts;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001200
1201 down_write(&nilfs->ns_sem);
Ryusuke Konishif7545142011-03-09 11:05:08 +09001202 nilfs_setup_super(sb, true);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001203 up_write(&nilfs->ns_sem);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001204 }
1205 out:
1206 return 0;
1207
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001208 restore_opts:
1209 sb->s_flags = old_sb_flags;
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +09001210 nilfs->ns_mount_opt = old_mount_opt;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001211 return err;
1212}
1213
1214struct nilfs_super_data {
1215 struct block_device *bdev;
1216 __u64 cno;
1217 int flags;
1218};
1219
1220/**
1221 * nilfs_identify - pre-read mount options needed to identify mount instance
1222 * @data: mount options
1223 * @sd: nilfs_super_data
1224 */
1225static int nilfs_identify(char *data, struct nilfs_super_data *sd)
1226{
1227 char *p, *options = data;
1228 substring_t args[MAX_OPT_ARGS];
Ryusuke Konishic05dbfc2010-09-16 00:36:24 +09001229 int token;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001230 int ret = 0;
1231
1232 do {
1233 p = strsep(&options, ",");
1234 if (p != NULL && *p) {
1235 token = match_token(p, tokens, args);
1236 if (token == Opt_snapshot) {
Ryusuke Konishic05dbfc2010-09-16 00:36:24 +09001237 if (!(sd->flags & MS_RDONLY)) {
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001238 ret++;
Ryusuke Konishic05dbfc2010-09-16 00:36:24 +09001239 } else {
1240 sd->cno = simple_strtoull(args[0].from,
1241 NULL, 0);
1242 /*
1243 * No need to see the end pointer;
1244 * match_token() has done syntax
1245 * checking.
1246 */
1247 if (sd->cno == 0)
1248 ret++;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001249 }
1250 }
1251 if (ret)
1252 printk(KERN_ERR
1253 "NILFS: invalid mount option: %s\n", p);
1254 }
1255 if (!options)
1256 break;
1257 BUG_ON(options == data);
1258 *(options - 1) = ',';
1259 } while (!ret);
1260 return ret;
1261}
1262
1263static int nilfs_set_bdev_super(struct super_block *s, void *data)
1264{
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001265 s->s_bdev = data;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001266 s->s_dev = s->s_bdev->bd_dev;
1267 return 0;
1268}
1269
1270static int nilfs_test_bdev_super(struct super_block *s, void *data)
1271{
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001272 return (void *)s->s_bdev == data;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001273}
1274
Al Viroe4c59d62010-07-26 12:19:34 +04001275static struct dentry *
1276nilfs_mount(struct file_system_type *fs_type, int flags,
1277 const char *dev_name, void *data)
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001278{
1279 struct nilfs_super_data sd;
Ryusuke Konishi33c8e572009-06-08 01:39:29 +09001280 struct super_block *s;
Tejun Heod4d77622010-11-13 11:55:18 +01001281 fmode_t mode = FMODE_READ | FMODE_EXCL;
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001282 struct dentry *root_dentry;
1283 int err, s_new = false;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001284
Ryusuke Konishi13e90552010-05-09 02:57:57 +09001285 if (!(flags & MS_RDONLY))
1286 mode |= FMODE_WRITE;
1287
Tejun Heod4d77622010-11-13 11:55:18 +01001288 sd.bdev = blkdev_get_by_path(dev_name, mode, fs_type);
Jan Blunckd6d4c192010-02-24 13:25:32 +01001289 if (IS_ERR(sd.bdev))
Al Viroe4c59d62010-07-26 12:19:34 +04001290 return ERR_CAST(sd.bdev);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001291
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001292 sd.cno = 0;
1293 sd.flags = flags;
1294 if (nilfs_identify((char *)data, &sd)) {
1295 err = -EINVAL;
1296 goto failed;
1297 }
1298
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +09001299 /*
1300 * once the super is inserted into the list by sget, s_umount
1301 * will protect the lockfs code from trying to start a snapshot
1302 * while we are mounting
1303 */
1304 mutex_lock(&sd.bdev->bd_fsfreeze_mutex);
1305 if (sd.bdev->bd_fsfreeze_count > 0) {
1306 mutex_unlock(&sd.bdev->bd_fsfreeze_mutex);
1307 err = -EBUSY;
Ryusuke Konishi33c8e572009-06-08 01:39:29 +09001308 goto failed;
1309 }
David Howells9249e172012-06-25 12:55:37 +01001310 s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, flags,
1311 sd.bdev);
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +09001312 mutex_unlock(&sd.bdev->bd_fsfreeze_mutex);
Ryusuke Konishi33c8e572009-06-08 01:39:29 +09001313 if (IS_ERR(s)) {
1314 err = PTR_ERR(s);
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001315 goto failed;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001316 }
1317
1318 if (!s->s_root) {
1319 char b[BDEVNAME_SIZE];
1320
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001321 s_new = true;
1322
Ryusuke Konishi33c8e572009-06-08 01:39:29 +09001323 /* New superblock instance created */
Ryusuke Konishi4571b822010-05-09 03:01:32 +09001324 s->s_mode = mode;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001325 strlcpy(s->s_id, bdevname(sd.bdev, b), sizeof(s->s_id));
1326 sb_set_blocksize(s, block_size(sd.bdev));
1327
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001328 err = nilfs_fill_super(s, data, flags & MS_SILENT ? 1 : 0);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001329 if (err)
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001330 goto failed_super;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001331
1332 s->s_flags |= MS_ACTIVE;
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001333 } else if (!sd.cno) {
1334 int busy = false;
1335
1336 if (nilfs_tree_was_touched(s->s_root)) {
1337 busy = nilfs_try_to_shrink_tree(s->s_root);
1338 if (busy && (flags ^ s->s_flags) & MS_RDONLY) {
1339 printk(KERN_ERR "NILFS: the device already "
1340 "has a %s mount.\n",
1341 (s->s_flags & MS_RDONLY) ?
1342 "read-only" : "read/write");
1343 err = -EBUSY;
1344 goto failed_super;
1345 }
1346 }
1347 if (!busy) {
1348 /*
1349 * Try remount to setup mount states if the current
1350 * tree is not mounted and only snapshots use this sb.
1351 */
1352 err = nilfs_remount(s, &flags, data);
1353 if (err)
1354 goto failed_super;
1355 }
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001356 }
1357
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001358 if (sd.cno) {
1359 err = nilfs_attach_snapshot(s, sd.cno, &root_dentry);
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001360 if (err)
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001361 goto failed_super;
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001362 } else {
1363 root_dentry = dget(s->s_root);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001364 }
1365
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001366 if (!s_new)
Tejun Heod4d77622010-11-13 11:55:18 +01001367 blkdev_put(sd.bdev, mode);
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001368
Al Viroe4c59d62010-07-26 12:19:34 +04001369 return root_dentry;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001370
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001371 failed_super:
Al Viroa95161a2009-08-09 00:52:02 +04001372 deactivate_locked_super(s);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001373
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001374 failed:
1375 if (!s_new)
Tejun Heod4d77622010-11-13 11:55:18 +01001376 blkdev_put(sd.bdev, mode);
Al Viroe4c59d62010-07-26 12:19:34 +04001377 return ERR_PTR(err);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001378}
1379
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001380struct file_system_type nilfs_fs_type = {
1381 .owner = THIS_MODULE,
1382 .name = "nilfs2",
Al Viroe4c59d62010-07-26 12:19:34 +04001383 .mount = nilfs_mount,
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001384 .kill_sb = kill_block_super,
1385 .fs_flags = FS_REQUIRES_DEV,
1386};
Eric W. Biederman7f78e032013-03-02 19:39:14 -08001387MODULE_ALIAS_FS("nilfs2");
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001388
Li Hong41c88bd2010-04-06 00:54:11 +08001389static void nilfs_inode_init_once(void *obj)
1390{
1391 struct nilfs_inode_info *ii = obj;
1392
1393 INIT_LIST_HEAD(&ii->i_dirty);
1394#ifdef CONFIG_NILFS_XATTR
1395 init_rwsem(&ii->xattr_sem);
1396#endif
Miklos Szeredi2aa15892011-02-23 13:49:47 +01001397 address_space_init_once(&ii->i_btnode_cache);
Ryusuke Konishi05d0e942010-07-10 20:52:09 +09001398 ii->i_bmap = &ii->i_bmap_data;
Li Hong41c88bd2010-04-06 00:54:11 +08001399 inode_init_once(&ii->vfs_inode);
1400}
1401
1402static void nilfs_segbuf_init_once(void *obj)
1403{
1404 memset(obj, 0, sizeof(struct nilfs_segment_buffer));
1405}
1406
1407static void nilfs_destroy_cachep(void)
1408{
Kirill A. Shutemov8c0a8532012-09-26 11:33:07 +10001409 /*
1410 * Make sure all delayed rcu free inodes are flushed before we
1411 * destroy cache.
1412 */
1413 rcu_barrier();
1414
Ryusuke Konishi84cb0992010-05-22 12:49:32 +09001415 if (nilfs_inode_cachep)
Li Hong41c88bd2010-04-06 00:54:11 +08001416 kmem_cache_destroy(nilfs_inode_cachep);
Ryusuke Konishi84cb0992010-05-22 12:49:32 +09001417 if (nilfs_transaction_cachep)
Li Hong41c88bd2010-04-06 00:54:11 +08001418 kmem_cache_destroy(nilfs_transaction_cachep);
Ryusuke Konishi84cb0992010-05-22 12:49:32 +09001419 if (nilfs_segbuf_cachep)
Li Hong41c88bd2010-04-06 00:54:11 +08001420 kmem_cache_destroy(nilfs_segbuf_cachep);
Ryusuke Konishi84cb0992010-05-22 12:49:32 +09001421 if (nilfs_btree_path_cache)
Li Hong41c88bd2010-04-06 00:54:11 +08001422 kmem_cache_destroy(nilfs_btree_path_cache);
1423}
1424
1425static int __init nilfs_init_cachep(void)
1426{
1427 nilfs_inode_cachep = kmem_cache_create("nilfs2_inode_cache",
1428 sizeof(struct nilfs_inode_info), 0,
1429 SLAB_RECLAIM_ACCOUNT, nilfs_inode_init_once);
1430 if (!nilfs_inode_cachep)
1431 goto fail;
1432
1433 nilfs_transaction_cachep = kmem_cache_create("nilfs2_transaction_cache",
1434 sizeof(struct nilfs_transaction_info), 0,
1435 SLAB_RECLAIM_ACCOUNT, NULL);
1436 if (!nilfs_transaction_cachep)
1437 goto fail;
1438
1439 nilfs_segbuf_cachep = kmem_cache_create("nilfs2_segbuf_cache",
1440 sizeof(struct nilfs_segment_buffer), 0,
1441 SLAB_RECLAIM_ACCOUNT, nilfs_segbuf_init_once);
1442 if (!nilfs_segbuf_cachep)
1443 goto fail;
1444
1445 nilfs_btree_path_cache = kmem_cache_create("nilfs2_btree_path_cache",
1446 sizeof(struct nilfs_btree_path) * NILFS_BTREE_LEVEL_MAX,
1447 0, 0, NULL);
1448 if (!nilfs_btree_path_cache)
1449 goto fail;
1450
1451 return 0;
1452
1453fail:
1454 nilfs_destroy_cachep();
1455 return -ENOMEM;
1456}
1457
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001458static int __init init_nilfs_fs(void)
1459{
1460 int err;
1461
Li Hong41c88bd2010-04-06 00:54:11 +08001462 err = nilfs_init_cachep();
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001463 if (err)
Li Hong41c88bd2010-04-06 00:54:11 +08001464 goto fail;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001465
1466 err = register_filesystem(&nilfs_fs_type);
1467 if (err)
Li Hong41c88bd2010-04-06 00:54:11 +08001468 goto free_cachep;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001469
Li Hong9f130262010-04-09 23:09:53 +08001470 printk(KERN_INFO "NILFS version 2 loaded\n");
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001471 return 0;
1472
Li Hong41c88bd2010-04-06 00:54:11 +08001473free_cachep:
1474 nilfs_destroy_cachep();
1475fail:
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001476 return err;
1477}
1478
1479static void __exit exit_nilfs_fs(void)
1480{
Li Hong41c88bd2010-04-06 00:54:11 +08001481 nilfs_destroy_cachep();
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001482 unregister_filesystem(&nilfs_fs_type);
1483}
1484
1485module_init(init_nilfs_fs)
1486module_exit(exit_nilfs_fs)