blob: 354013ea22ec212001ef2c300fdf282ad39c611d [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;
Christoph Hellwigb83ae6d2015-01-14 10:42:37 +0100169 nilfs_mapping_init(&ii->i_btnode_cache, &ii->vfs_inode);
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);
Andreas Rohnere2c76172014-10-13 15:53:20 -0700313 nilfs->ns_flushed_device = 1;
314 /* make sure store to ns_flushed_device cannot be reordered */
315 smp_wmb();
Ryusuke Konishif7545142011-03-09 11:05:08 +0900316 return nilfs_sync_super(sb, flag);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700317}
318
Ryusuke Konishi7ecaa462010-06-28 17:49:29 +0900319/**
320 * nilfs_cleanup_super() - write filesystem state for cleanup
Ryusuke Konishif7545142011-03-09 11:05:08 +0900321 * @sb: super block instance to be unmounted or degraded to read-only
Ryusuke Konishi7ecaa462010-06-28 17:49:29 +0900322 *
323 * This function restores state flags in the on-disk super block.
324 * This will set "clean" flag (i.e. NILFS_VALID_FS) unless the
325 * filesystem was not clean previously.
326 */
Ryusuke Konishif7545142011-03-09 11:05:08 +0900327int nilfs_cleanup_super(struct super_block *sb)
Ryusuke Konishi7ecaa462010-06-28 17:49:29 +0900328{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900329 struct the_nilfs *nilfs = sb->s_fs_info;
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900330 struct nilfs_super_block **sbp;
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900331 int flag = NILFS_SB_COMMIT;
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900332 int ret = -EIO;
Ryusuke Konishi7ecaa462010-06-28 17:49:29 +0900333
Ryusuke Konishif7545142011-03-09 11:05:08 +0900334 sbp = nilfs_prepare_super(sb, 0);
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900335 if (sbp) {
Ryusuke Konishif7545142011-03-09 11:05:08 +0900336 sbp[0]->s_state = cpu_to_le16(nilfs->ns_mount_state);
337 nilfs_set_log_cursor(sbp[0], nilfs);
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900338 if (sbp[1] && sbp[0]->s_last_cno == sbp[1]->s_last_cno) {
339 /*
340 * make the "clean" flag also to the opposite
341 * super block if both super blocks point to
342 * the same checkpoint.
343 */
344 sbp[1]->s_state = sbp[0]->s_state;
345 flag = NILFS_SB_COMMIT_ALL;
346 }
Ryusuke Konishif7545142011-03-09 11:05:08 +0900347 ret = nilfs_commit_super(sb, flag);
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900348 }
Ryusuke Konishi7ecaa462010-06-28 17:49:29 +0900349 return ret;
350}
351
Ryusuke Konishicfb0a4b2011-05-05 01:23:57 +0900352/**
353 * nilfs_move_2nd_super - relocate secondary super block
354 * @sb: super block instance
355 * @sb2off: new offset of the secondary super block (in bytes)
356 */
357static int nilfs_move_2nd_super(struct super_block *sb, loff_t sb2off)
358{
359 struct the_nilfs *nilfs = sb->s_fs_info;
360 struct buffer_head *nsbh;
361 struct nilfs_super_block *nsbp;
362 sector_t blocknr, newblocknr;
363 unsigned long offset;
Ryusuke Konishi4f050282015-11-06 16:32:16 -0800364 int sb2i; /* array index of the secondary superblock */
Ryusuke Konishicfb0a4b2011-05-05 01:23:57 +0900365 int ret = 0;
366
367 /* nilfs->ns_sem must be locked by the caller. */
368 if (nilfs->ns_sbh[1] &&
369 nilfs->ns_sbh[1]->b_blocknr > nilfs->ns_first_data_block) {
370 sb2i = 1;
371 blocknr = nilfs->ns_sbh[1]->b_blocknr;
372 } else if (nilfs->ns_sbh[0]->b_blocknr > nilfs->ns_first_data_block) {
373 sb2i = 0;
374 blocknr = nilfs->ns_sbh[0]->b_blocknr;
Ryusuke Konishi4f050282015-11-06 16:32:16 -0800375 } else {
376 sb2i = -1;
377 blocknr = 0;
Ryusuke Konishicfb0a4b2011-05-05 01:23:57 +0900378 }
379 if (sb2i >= 0 && (u64)blocknr << nilfs->ns_blocksize_bits == sb2off)
380 goto out; /* super block location is unchanged */
381
382 /* Get new super block buffer */
383 newblocknr = sb2off >> nilfs->ns_blocksize_bits;
384 offset = sb2off & (nilfs->ns_blocksize - 1);
385 nsbh = sb_getblk(sb, newblocknr);
386 if (!nsbh) {
387 printk(KERN_WARNING
388 "NILFS warning: unable to move secondary superblock "
389 "to block %llu\n", (unsigned long long)newblocknr);
390 ret = -EIO;
391 goto out;
392 }
393 nsbp = (void *)nsbh->b_data + offset;
394 memset(nsbp, 0, nilfs->ns_blocksize);
395
396 if (sb2i >= 0) {
397 memcpy(nsbp, nilfs->ns_sbp[sb2i], nilfs->ns_sbsize);
398 brelse(nilfs->ns_sbh[sb2i]);
399 nilfs->ns_sbh[sb2i] = nsbh;
400 nilfs->ns_sbp[sb2i] = nsbp;
401 } else if (nilfs->ns_sbh[0]->b_blocknr < nilfs->ns_first_data_block) {
402 /* secondary super block will be restored to index 1 */
403 nilfs->ns_sbh[1] = nsbh;
404 nilfs->ns_sbp[1] = nsbp;
405 } else {
406 brelse(nsbh);
407 }
408out:
409 return ret;
410}
411
Ryusuke Konishi4e33f9e2011-05-05 01:23:58 +0900412/**
413 * nilfs_resize_fs - resize the filesystem
414 * @sb: super block instance
415 * @newsize: new size of the filesystem (in bytes)
416 */
417int nilfs_resize_fs(struct super_block *sb, __u64 newsize)
418{
419 struct the_nilfs *nilfs = sb->s_fs_info;
420 struct nilfs_super_block **sbp;
421 __u64 devsize, newnsegs;
422 loff_t sb2off;
423 int ret;
424
425 ret = -ERANGE;
426 devsize = i_size_read(sb->s_bdev->bd_inode);
427 if (newsize > devsize)
428 goto out;
429
430 /*
431 * Write lock is required to protect some functions depending
432 * on the number of segments, the number of reserved segments,
433 * and so forth.
434 */
435 down_write(&nilfs->ns_segctor_sem);
436
437 sb2off = NILFS_SB2_OFFSET_BYTES(newsize);
438 newnsegs = sb2off >> nilfs->ns_blocksize_bits;
439 do_div(newnsegs, nilfs->ns_blocks_per_segment);
440
441 ret = nilfs_sufile_resize(nilfs->ns_sufile, newnsegs);
442 up_write(&nilfs->ns_segctor_sem);
443 if (ret < 0)
444 goto out;
445
446 ret = nilfs_construct_segment(sb);
447 if (ret < 0)
448 goto out;
449
450 down_write(&nilfs->ns_sem);
451 nilfs_move_2nd_super(sb, sb2off);
452 ret = -EIO;
453 sbp = nilfs_prepare_super(sb, 0);
454 if (likely(sbp)) {
455 nilfs_set_log_cursor(sbp[0], nilfs);
456 /*
457 * Drop NILFS_RESIZE_FS flag for compatibility with
458 * mount-time resize which may be implemented in a
459 * future release.
460 */
461 sbp[0]->s_state = cpu_to_le16(le16_to_cpu(sbp[0]->s_state) &
462 ~NILFS_RESIZE_FS);
463 sbp[0]->s_dev_size = cpu_to_le64(newsize);
464 sbp[0]->s_nsegments = cpu_to_le64(nilfs->ns_nsegments);
465 if (sbp[1])
466 memcpy(sbp[1], sbp[0], nilfs->ns_sbsize);
467 ret = nilfs_commit_super(sb, NILFS_SB_COMMIT_ALL);
468 }
469 up_write(&nilfs->ns_sem);
470
471 /*
472 * Reset the range of allocatable segments last. This order
473 * is important in the case of expansion because the secondary
474 * superblock must be protected from log write until migration
475 * completes.
476 */
477 if (!ret)
478 nilfs_sufile_set_alloc_range(nilfs->ns_sufile, 0, newnsegs - 1);
479out:
480 return ret;
481}
482
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700483static void nilfs_put_super(struct super_block *sb)
484{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900485 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700486
Ryusuke Konishif7545142011-03-09 11:05:08 +0900487 nilfs_detach_log_writer(sb);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700488
489 if (!(sb->s_flags & MS_RDONLY)) {
490 down_write(&nilfs->ns_sem);
Ryusuke Konishif7545142011-03-09 11:05:08 +0900491 nilfs_cleanup_super(sb);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700492 up_write(&nilfs->ns_sem);
493 }
494
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900495 iput(nilfs->ns_sufile);
496 iput(nilfs->ns_cpfile);
497 iput(nilfs->ns_dat);
498
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +0900499 destroy_nilfs(nilfs);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700500 sb->s_fs_info = NULL;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700501}
502
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700503static int nilfs_sync_fs(struct super_block *sb, int wait)
504{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900505 struct the_nilfs *nilfs = sb->s_fs_info;
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900506 struct nilfs_super_block **sbp;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700507 int err = 0;
508
509 /* This function is called when super block should be written back */
510 if (wait)
511 err = nilfs_construct_segment(sb);
Jiro SEKIBA6233caa2009-07-23 01:26:33 +0900512
513 down_write(&nilfs->ns_sem);
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900514 if (nilfs_sb_dirty(nilfs)) {
Ryusuke Konishif7545142011-03-09 11:05:08 +0900515 sbp = nilfs_prepare_super(sb, nilfs_sb_will_flip(nilfs));
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900516 if (likely(sbp)) {
517 nilfs_set_log_cursor(sbp[0], nilfs);
Ryusuke Konishif7545142011-03-09 11:05:08 +0900518 nilfs_commit_super(sb, NILFS_SB_COMMIT);
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900519 }
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900520 }
Jiro SEKIBA6233caa2009-07-23 01:26:33 +0900521 up_write(&nilfs->ns_sem);
522
Andreas Rohnere2c76172014-10-13 15:53:20 -0700523 if (!err)
524 err = nilfs_flush_device(nilfs);
525
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700526 return err;
527}
528
Ryusuke Konishif7545142011-03-09 11:05:08 +0900529int nilfs_attach_checkpoint(struct super_block *sb, __u64 cno, int curr_mnt,
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900530 struct nilfs_root **rootp)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700531{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900532 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900533 struct nilfs_root *root;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700534 struct nilfs_checkpoint *raw_cp;
535 struct buffer_head *bh_cp;
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900536 int err = -ENOMEM;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700537
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900538 root = nilfs_find_or_create_root(
539 nilfs, curr_mnt ? NILFS_CPTREE_CURRENT_CNO : cno);
540 if (!root)
541 return err;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700542
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900543 if (root->ifile)
544 goto reuse; /* already attached checkpoint */
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700545
Zhang Qiang1154ecb2009-08-18 14:58:24 +0800546 down_read(&nilfs->ns_segctor_sem);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700547 err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, cno, 0, &raw_cp,
548 &bh_cp);
Zhang Qiang1154ecb2009-08-18 14:58:24 +0800549 up_read(&nilfs->ns_segctor_sem);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700550 if (unlikely(err)) {
551 if (err == -ENOENT || err == -EINVAL) {
552 printk(KERN_ERR
553 "NILFS: Invalid checkpoint "
554 "(checkpoint number=%llu)\n",
555 (unsigned long long)cno);
556 err = -EINVAL;
557 }
558 goto failed;
559 }
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900560
Ryusuke Konishif7545142011-03-09 11:05:08 +0900561 err = nilfs_ifile_read(sb, root, nilfs->ns_inode_size,
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900562 &raw_cp->cp_ifile_inode, &root->ifile);
563 if (err)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700564 goto failed_bh;
Ryusuke Konishib7c06342010-08-14 14:48:32 +0900565
Vyacheslav Dubeykoe5f7f842013-07-03 15:08:06 -0700566 atomic64_set(&root->inodes_count,
567 le64_to_cpu(raw_cp->cp_inodes_count));
568 atomic64_set(&root->blocks_count,
569 le64_to_cpu(raw_cp->cp_blocks_count));
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700570
571 nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp);
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900572
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900573 reuse:
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900574 *rootp = root;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700575 return 0;
576
577 failed_bh:
578 nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp);
579 failed:
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900580 nilfs_put_root(root);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700581
582 return err;
583}
584
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900585static int nilfs_freeze(struct super_block *sb)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700586{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900587 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900588 int err;
589
590 if (sb->s_flags & MS_RDONLY)
591 return 0;
592
593 /* Mark super block clean */
594 down_write(&nilfs->ns_sem);
Ryusuke Konishif7545142011-03-09 11:05:08 +0900595 err = nilfs_cleanup_super(sb);
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900596 up_write(&nilfs->ns_sem);
597 return err;
598}
599
600static int nilfs_unfreeze(struct super_block *sb)
601{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900602 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700603
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900604 if (sb->s_flags & MS_RDONLY)
605 return 0;
606
607 down_write(&nilfs->ns_sem);
Ryusuke Konishif7545142011-03-09 11:05:08 +0900608 nilfs_setup_super(sb, false);
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900609 up_write(&nilfs->ns_sem);
610 return 0;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700611}
612
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700613static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf)
614{
615 struct super_block *sb = dentry->d_sb;
David Howells2b0143b2015-03-17 22:25:59 +0000616 struct nilfs_root *root = NILFS_I(d_inode(dentry))->i_root;
Ryusuke Konishib7c06342010-08-14 14:48:32 +0900617 struct the_nilfs *nilfs = root->nilfs;
Ryusuke Konishic306af22009-03-26 10:16:57 +0900618 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700619 unsigned long long blocks;
620 unsigned long overhead;
621 unsigned long nrsvblocks;
622 sector_t nfreeblocks;
Vyacheslav Dubeykoc7ef9722013-07-03 15:08:05 -0700623 u64 nmaxinodes, nfreeinodes;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700624 int err;
625
626 /*
627 * Compute all of the segment blocks
628 *
629 * The blocks before first segment and after last segment
630 * are excluded.
631 */
632 blocks = nilfs->ns_blocks_per_segment * nilfs->ns_nsegments
633 - nilfs->ns_first_data_block;
634 nrsvblocks = nilfs->ns_nrsvsegs * nilfs->ns_blocks_per_segment;
635
636 /*
637 * Compute the overhead
638 *
Ryusuke Konishi7a650042010-03-14 03:32:40 +0900639 * When distributing meta data blocks outside segment structure,
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700640 * We must count them as the overhead.
641 */
642 overhead = 0;
643
644 err = nilfs_count_free_blocks(nilfs, &nfreeblocks);
645 if (unlikely(err))
646 return err;
647
Vyacheslav Dubeykoc7ef9722013-07-03 15:08:05 -0700648 err = nilfs_ifile_count_free_inodes(root->ifile,
649 &nmaxinodes, &nfreeinodes);
650 if (unlikely(err)) {
651 printk(KERN_WARNING
652 "NILFS warning: fail to count free inodes: err %d.\n",
653 err);
654 if (err == -ERANGE) {
655 /*
656 * If nilfs_palloc_count_max_entries() returns
657 * -ERANGE error code then we simply treat
658 * curent inodes count as maximum possible and
659 * zero as free inodes value.
660 */
Vyacheslav Dubeykoe5f7f842013-07-03 15:08:06 -0700661 nmaxinodes = atomic64_read(&root->inodes_count);
Vyacheslav Dubeykoc7ef9722013-07-03 15:08:05 -0700662 nfreeinodes = 0;
663 err = 0;
664 } else
665 return err;
666 }
667
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700668 buf->f_type = NILFS_SUPER_MAGIC;
669 buf->f_bsize = sb->s_blocksize;
670 buf->f_blocks = blocks - overhead;
671 buf->f_bfree = nfreeblocks;
672 buf->f_bavail = (buf->f_bfree >= nrsvblocks) ?
673 (buf->f_bfree - nrsvblocks) : 0;
Vyacheslav Dubeykoc7ef9722013-07-03 15:08:05 -0700674 buf->f_files = nmaxinodes;
675 buf->f_ffree = nfreeinodes;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700676 buf->f_namelen = NILFS_NAME_LEN;
Ryusuke Konishic306af22009-03-26 10:16:57 +0900677 buf->f_fsid.val[0] = (u32)id;
678 buf->f_fsid.val[1] = (u32)(id >> 32);
679
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700680 return 0;
681}
682
Al Viro34c80b12011-12-08 21:32:45 -0500683static int nilfs_show_options(struct seq_file *seq, struct dentry *dentry)
Jiro SEKIBAb58a2852009-06-24 20:06:34 +0900684{
Al Viro34c80b12011-12-08 21:32:45 -0500685 struct super_block *sb = dentry->d_sb;
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900686 struct the_nilfs *nilfs = sb->s_fs_info;
David Howells2b0143b2015-03-17 22:25:59 +0000687 struct nilfs_root *root = NILFS_I(d_inode(dentry))->i_root;
Jiro SEKIBAb58a2852009-06-24 20:06:34 +0900688
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900689 if (!nilfs_test_opt(nilfs, BARRIER))
Ryusuke Konishic6b4d572010-07-05 14:40:27 +0900690 seq_puts(seq, ",nobarrier");
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900691 if (root->cno != NILFS_CPTREE_CURRENT_CNO)
692 seq_printf(seq, ",cp=%llu", (unsigned long long)root->cno);
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900693 if (nilfs_test_opt(nilfs, ERRORS_PANIC))
Ryusuke Konishic6b4d572010-07-05 14:40:27 +0900694 seq_puts(seq, ",errors=panic");
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900695 if (nilfs_test_opt(nilfs, ERRORS_CONT))
Ryusuke Konishic6b4d572010-07-05 14:40:27 +0900696 seq_puts(seq, ",errors=continue");
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900697 if (nilfs_test_opt(nilfs, STRICT_ORDER))
Ryusuke Konishic6b4d572010-07-05 14:40:27 +0900698 seq_puts(seq, ",order=strict");
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900699 if (nilfs_test_opt(nilfs, NORECOVERY))
Ryusuke Konishic6b4d572010-07-05 14:40:27 +0900700 seq_puts(seq, ",norecovery");
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900701 if (nilfs_test_opt(nilfs, DISCARD))
Ryusuke Konishic6b4d572010-07-05 14:40:27 +0900702 seq_puts(seq, ",discard");
Jiro SEKIBAb58a2852009-06-24 20:06:34 +0900703
704 return 0;
705}
706
Alexey Dobriyanb87221d2009-09-21 17:01:09 -0700707static const struct super_operations nilfs_sops = {
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700708 .alloc_inode = nilfs_alloc_inode,
709 .destroy_inode = nilfs_destroy_inode,
710 .dirty_inode = nilfs_dirty_inode,
Al Viro6fd1e5c2010-06-07 11:55:00 -0400711 .evict_inode = nilfs_evict_inode,
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700712 .put_super = nilfs_put_super,
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700713 .sync_fs = nilfs_sync_fs,
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900714 .freeze_fs = nilfs_freeze,
715 .unfreeze_fs = nilfs_unfreeze,
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700716 .statfs = nilfs_statfs,
717 .remount_fs = nilfs_remount,
Jiro SEKIBAb58a2852009-06-24 20:06:34 +0900718 .show_options = nilfs_show_options
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700719};
720
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700721enum {
722 Opt_err_cont, Opt_err_panic, Opt_err_ro,
Ryusuke Konishi773bc4f2010-07-05 13:00:08 +0900723 Opt_barrier, Opt_nobarrier, Opt_snapshot, Opt_order, Opt_norecovery,
Ryusuke Konishi802d3172010-07-05 14:27:04 +0900724 Opt_discard, Opt_nodiscard, Opt_err,
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700725};
726
727static match_table_t tokens = {
728 {Opt_err_cont, "errors=continue"},
729 {Opt_err_panic, "errors=panic"},
730 {Opt_err_ro, "errors=remount-ro"},
Ryusuke Konishi773bc4f2010-07-05 13:00:08 +0900731 {Opt_barrier, "barrier"},
Jiro SEKIBA91f19532009-11-12 14:07:26 +0900732 {Opt_nobarrier, "nobarrier"},
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700733 {Opt_snapshot, "cp=%u"},
734 {Opt_order, "order=%s"},
Ryusuke Konishi02345762009-11-20 03:28:01 +0900735 {Opt_norecovery, "norecovery"},
Jiro SEKIBAe902ec92010-01-30 18:06:35 +0900736 {Opt_discard, "discard"},
Ryusuke Konishi802d3172010-07-05 14:27:04 +0900737 {Opt_nodiscard, "nodiscard"},
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700738 {Opt_err, NULL}
739};
740
Ryusuke Konishi7c017452010-07-05 20:08:33 +0900741static int parse_options(char *options, struct super_block *sb, int is_remount)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700742{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900743 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700744 char *p;
745 substring_t args[MAX_OPT_ARGS];
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700746
747 if (!options)
748 return 1;
749
750 while ((p = strsep(&options, ",")) != NULL) {
751 int token;
752 if (!*p)
753 continue;
754
755 token = match_token(p, tokens, args);
756 switch (token) {
Ryusuke Konishi773bc4f2010-07-05 13:00:08 +0900757 case Opt_barrier:
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900758 nilfs_set_opt(nilfs, BARRIER);
Ryusuke Konishi773bc4f2010-07-05 13:00:08 +0900759 break;
Jiro SEKIBA91f19532009-11-12 14:07:26 +0900760 case Opt_nobarrier:
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900761 nilfs_clear_opt(nilfs, BARRIER);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700762 break;
763 case Opt_order:
764 if (strcmp(args[0].from, "relaxed") == 0)
765 /* Ordered data semantics */
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900766 nilfs_clear_opt(nilfs, STRICT_ORDER);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700767 else if (strcmp(args[0].from, "strict") == 0)
768 /* Strict in-order semantics */
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900769 nilfs_set_opt(nilfs, STRICT_ORDER);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700770 else
771 return 0;
772 break;
773 case Opt_err_panic:
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900774 nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_PANIC);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700775 break;
776 case Opt_err_ro:
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900777 nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_RO);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700778 break;
779 case Opt_err_cont:
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900780 nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_CONT);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700781 break;
782 case Opt_snapshot:
Ryusuke Konishi7c017452010-07-05 20:08:33 +0900783 if (is_remount) {
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900784 printk(KERN_ERR
785 "NILFS: \"%s\" option is invalid "
786 "for remount.\n", p);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700787 return 0;
Ryusuke Konishi7c017452010-07-05 20:08:33 +0900788 }
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700789 break;
Ryusuke Konishi02345762009-11-20 03:28:01 +0900790 case Opt_norecovery:
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900791 nilfs_set_opt(nilfs, NORECOVERY);
Ryusuke Konishi02345762009-11-20 03:28:01 +0900792 break;
Jiro SEKIBAe902ec92010-01-30 18:06:35 +0900793 case Opt_discard:
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900794 nilfs_set_opt(nilfs, DISCARD);
Jiro SEKIBAe902ec92010-01-30 18:06:35 +0900795 break;
Ryusuke Konishi802d3172010-07-05 14:27:04 +0900796 case Opt_nodiscard:
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900797 nilfs_clear_opt(nilfs, DISCARD);
Ryusuke Konishi802d3172010-07-05 14:27:04 +0900798 break;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700799 default:
800 printk(KERN_ERR
801 "NILFS: Unrecognized mount option \"%s\"\n", p);
802 return 0;
803 }
804 }
805 return 1;
806}
807
808static inline void
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900809nilfs_set_default_options(struct super_block *sb,
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700810 struct nilfs_super_block *sbp)
811{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900812 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900813
814 nilfs->ns_mount_opt =
Ryusuke Konishi277a6a32010-04-02 18:02:33 +0900815 NILFS_MOUNT_ERRORS_RO | NILFS_MOUNT_BARRIER;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700816}
817
Ryusuke Konishif7545142011-03-09 11:05:08 +0900818static int nilfs_setup_super(struct super_block *sb, int is_mount)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700819{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900820 struct the_nilfs *nilfs = sb->s_fs_info;
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900821 struct nilfs_super_block **sbp;
822 int max_mnt_count;
823 int mnt_count;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700824
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900825 /* nilfs->ns_sem must be locked by the caller. */
Ryusuke Konishif7545142011-03-09 11:05:08 +0900826 sbp = nilfs_prepare_super(sb, 0);
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900827 if (!sbp)
828 return -EIO;
829
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900830 if (!is_mount)
831 goto skip_mount_setup;
832
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900833 max_mnt_count = le16_to_cpu(sbp[0]->s_max_mnt_count);
834 mnt_count = le16_to_cpu(sbp[0]->s_mnt_count);
835
Ryusuke Konishif50a4c82009-11-19 16:58:40 +0900836 if (nilfs->ns_mount_state & NILFS_ERROR_FS) {
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700837 printk(KERN_WARNING
838 "NILFS warning: mounting fs with errors\n");
839#if 0
840 } else if (max_mnt_count >= 0 && mnt_count >= max_mnt_count) {
841 printk(KERN_WARNING
842 "NILFS warning: maximal mount count reached\n");
843#endif
844 }
845 if (!max_mnt_count)
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900846 sbp[0]->s_max_mnt_count = cpu_to_le16(NILFS_DFL_MAX_MNT_COUNT);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700847
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900848 sbp[0]->s_mnt_count = cpu_to_le16(mnt_count + 1);
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900849 sbp[0]->s_mtime = cpu_to_le64(get_seconds());
850
851skip_mount_setup:
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900852 sbp[0]->s_state =
853 cpu_to_le16(le16_to_cpu(sbp[0]->s_state) & ~NILFS_VALID_FS);
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900854 /* synchronize sbp[1] with sbp[0] */
Ryusuke Konishi0ca7a5b2011-01-21 16:40:31 +0900855 if (sbp[1])
856 memcpy(sbp[1], sbp[0], nilfs->ns_sbsize);
Ryusuke Konishif7545142011-03-09 11:05:08 +0900857 return nilfs_commit_super(sb, NILFS_SB_COMMIT_ALL);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700858}
859
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700860struct nilfs_super_block *nilfs_read_super_block(struct super_block *sb,
861 u64 pos, int blocksize,
862 struct buffer_head **pbh)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700863{
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700864 unsigned long long sb_index = pos;
865 unsigned long offset;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700866
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700867 offset = do_div(sb_index, blocksize);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700868 *pbh = sb_bread(sb, sb_index);
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700869 if (!*pbh)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700870 return NULL;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700871 return (struct nilfs_super_block *)((char *)(*pbh)->b_data + offset);
872}
873
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700874int nilfs_store_magic_and_option(struct super_block *sb,
875 struct nilfs_super_block *sbp,
876 char *data)
877{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900878 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700879
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700880 sb->s_magic = le16_to_cpu(sbp->s_magic);
881
882 /* FS independent flags */
883#ifdef NILFS_ATIME_DISABLE
884 sb->s_flags |= MS_NOATIME;
885#endif
886
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900887 nilfs_set_default_options(sb, sbp);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700888
Ryusuke Konishi574e6c32011-03-09 11:05:07 +0900889 nilfs->ns_resuid = le16_to_cpu(sbp->s_def_resuid);
890 nilfs->ns_resgid = le16_to_cpu(sbp->s_def_resgid);
891 nilfs->ns_interval = le32_to_cpu(sbp->s_c_interval);
892 nilfs->ns_watermark = le32_to_cpu(sbp->s_c_block_max);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700893
Ryusuke Konishi7c017452010-07-05 20:08:33 +0900894 return !parse_options(data, sb, 0) ? -EINVAL : 0 ;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700895}
896
Ryusuke Konishic5ca48a2010-07-22 03:22:20 +0900897int nilfs_check_feature_compatibility(struct super_block *sb,
898 struct nilfs_super_block *sbp)
899{
900 __u64 features;
901
902 features = le64_to_cpu(sbp->s_feature_incompat) &
903 ~NILFS_FEATURE_INCOMPAT_SUPP;
904 if (features) {
905 printk(KERN_ERR "NILFS: couldn't mount because of unsupported "
906 "optional features (%llx)\n",
907 (unsigned long long)features);
908 return -EINVAL;
909 }
910 features = le64_to_cpu(sbp->s_feature_compat_ro) &
911 ~NILFS_FEATURE_COMPAT_RO_SUPP;
912 if (!(sb->s_flags & MS_RDONLY) && features) {
913 printk(KERN_ERR "NILFS: couldn't mount RDWR because of "
914 "unsupported optional features (%llx)\n",
915 (unsigned long long)features);
916 return -EINVAL;
917 }
918 return 0;
919}
920
Ryusuke Konishi367ea332010-08-26 01:52:51 +0900921static int nilfs_get_root_dentry(struct super_block *sb,
922 struct nilfs_root *root,
923 struct dentry **root_dentry)
924{
925 struct inode *inode;
926 struct dentry *dentry;
927 int ret = 0;
928
929 inode = nilfs_iget(sb, root, NILFS_ROOT_INO);
930 if (IS_ERR(inode)) {
931 printk(KERN_ERR "NILFS: get root inode failed\n");
932 ret = PTR_ERR(inode);
933 goto out;
934 }
935 if (!S_ISDIR(inode->i_mode) || !inode->i_blocks || !inode->i_size) {
936 iput(inode);
937 printk(KERN_ERR "NILFS: corrupt root inode.\n");
938 ret = -EINVAL;
939 goto out;
940 }
941
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900942 if (root->cno == NILFS_CPTREE_CURRENT_CNO) {
943 dentry = d_find_alias(inode);
944 if (!dentry) {
Al Viro48fde702012-01-08 22:15:13 -0500945 dentry = d_make_root(inode);
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900946 if (!dentry) {
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900947 ret = -ENOMEM;
948 goto failed_dentry;
949 }
950 } else {
951 iput(inode);
952 }
953 } else {
J. Bruce Fields1a0a3972014-02-14 17:35:37 -0500954 dentry = d_obtain_root(inode);
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900955 if (IS_ERR(dentry)) {
956 ret = PTR_ERR(dentry);
957 goto failed_dentry;
958 }
Ryusuke Konishi367ea332010-08-26 01:52:51 +0900959 }
960 *root_dentry = dentry;
961 out:
962 return ret;
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900963
964 failed_dentry:
965 printk(KERN_ERR "NILFS: get root dentry failed\n");
966 goto out;
Ryusuke Konishi367ea332010-08-26 01:52:51 +0900967}
968
Ryusuke Konishiab4d8f72010-08-26 02:15:41 +0900969static int nilfs_attach_snapshot(struct super_block *s, __u64 cno,
970 struct dentry **root_dentry)
971{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900972 struct the_nilfs *nilfs = s->s_fs_info;
Ryusuke Konishiab4d8f72010-08-26 02:15:41 +0900973 struct nilfs_root *root;
974 int ret;
975
Ryusuke Konishi572d8b32012-07-30 14:42:07 -0700976 mutex_lock(&nilfs->ns_snapshot_mount_mutex);
977
Ryusuke Konishiab4d8f72010-08-26 02:15:41 +0900978 down_read(&nilfs->ns_segctor_sem);
979 ret = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile, cno);
980 up_read(&nilfs->ns_segctor_sem);
981 if (ret < 0) {
982 ret = (ret == -ENOENT) ? -EINVAL : ret;
983 goto out;
984 } else if (!ret) {
985 printk(KERN_ERR "NILFS: The specified checkpoint is "
986 "not a snapshot (checkpoint number=%llu).\n",
987 (unsigned long long)cno);
988 ret = -EINVAL;
989 goto out;
990 }
991
Ryusuke Konishif7545142011-03-09 11:05:08 +0900992 ret = nilfs_attach_checkpoint(s, cno, false, &root);
Ryusuke Konishiab4d8f72010-08-26 02:15:41 +0900993 if (ret) {
994 printk(KERN_ERR "NILFS: error loading snapshot "
995 "(checkpoint number=%llu).\n",
996 (unsigned long long)cno);
997 goto out;
998 }
999 ret = nilfs_get_root_dentry(s, root, root_dentry);
1000 nilfs_put_root(root);
1001 out:
Ryusuke Konishi572d8b32012-07-30 14:42:07 -07001002 mutex_unlock(&nilfs->ns_snapshot_mount_mutex);
Ryusuke Konishiab4d8f72010-08-26 02:15:41 +09001003 return ret;
1004}
1005
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001006/**
Al Viroe95c3112013-08-24 12:06:16 -04001007 * nilfs_tree_is_busy() - try to shrink dentries of a checkpoint
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001008 * @root_dentry: root dentry of the tree to be shrunk
1009 *
1010 * This function returns true if the tree was in-use.
1011 */
Al Viroe95c3112013-08-24 12:06:16 -04001012static bool nilfs_tree_is_busy(struct dentry *root_dentry)
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001013{
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001014 shrink_dcache_parent(root_dentry);
Al Viroe95c3112013-08-24 12:06:16 -04001015 return d_count(root_dentry) > 1;
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001016}
1017
Ryusuke Konishi032dbb32010-09-13 11:16:34 +09001018int nilfs_checkpoint_is_mounted(struct super_block *sb, __u64 cno)
1019{
Ryusuke Konishie3154e92011-03-09 11:05:08 +09001020 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi032dbb32010-09-13 11:16:34 +09001021 struct nilfs_root *root;
1022 struct inode *inode;
1023 struct dentry *dentry;
1024 int ret;
1025
Ryusuke Konishi3377f842015-04-16 12:46:45 -07001026 if (cno > nilfs->ns_cno)
Ryusuke Konishi032dbb32010-09-13 11:16:34 +09001027 return false;
1028
1029 if (cno >= nilfs_last_cno(nilfs))
1030 return true; /* protect recent checkpoints */
1031
1032 ret = false;
Ryusuke Konishie3154e92011-03-09 11:05:08 +09001033 root = nilfs_lookup_root(nilfs, cno);
Ryusuke Konishi032dbb32010-09-13 11:16:34 +09001034 if (root) {
1035 inode = nilfs_ilookup(sb, root, NILFS_ROOT_INO);
1036 if (inode) {
1037 dentry = d_find_alias(inode);
1038 if (dentry) {
Al Viroe95c3112013-08-24 12:06:16 -04001039 ret = nilfs_tree_is_busy(dentry);
Ryusuke Konishi032dbb32010-09-13 11:16:34 +09001040 dput(dentry);
1041 }
1042 iput(inode);
1043 }
1044 nilfs_put_root(root);
1045 }
1046 return ret;
1047}
1048
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001049/**
1050 * nilfs_fill_super() - initialize a super block instance
1051 * @sb: super_block
1052 * @data: mount options
1053 * @silent: silent mode flag
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001054 *
Ryusuke Konishiaa7dfb82009-06-08 01:39:33 +09001055 * This function is called exclusively by nilfs->ns_mount_mutex.
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001056 * So, the recovery process is protected from other simultaneous mounts.
1057 */
1058static int
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001059nilfs_fill_super(struct super_block *sb, void *data, int silent)
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001060{
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001061 struct the_nilfs *nilfs;
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +09001062 struct nilfs_root *fsroot;
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
Christoph Hellwig26ff1302015-01-14 10:42:35 +01001082 sb->s_bdi = &bdev_get_queue(sb->s_bdev)->backing_dev_info;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001083
Ryusuke Konishif7545142011-03-09 11:05:08 +09001084 err = load_nilfs(nilfs, sb);
Ryusuke Konishif50a4c82009-11-19 16:58:40 +09001085 if (err)
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001086 goto failed_nilfs;
Ryusuke Konishif50a4c82009-11-19 16:58:40 +09001087
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001088 cno = nilfs_last_cno(nilfs);
Ryusuke Konishif7545142011-03-09 11:05:08 +09001089 err = nilfs_attach_checkpoint(sb, cno, true, &fsroot);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001090 if (err) {
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001091 printk(KERN_ERR "NILFS: error loading last checkpoint "
1092 "(checkpoint number=%llu).\n", (unsigned long long)cno);
Ryusuke Konishif1e89c82010-09-05 12:20:59 +09001093 goto failed_unload;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001094 }
1095
1096 if (!(sb->s_flags & MS_RDONLY)) {
Ryusuke Konishif7545142011-03-09 11:05:08 +09001097 err = nilfs_attach_log_writer(sb, fsroot);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001098 if (err)
1099 goto failed_checkpoint;
1100 }
1101
Ryusuke Konishi367ea332010-08-26 01:52:51 +09001102 err = nilfs_get_root_dentry(sb, fsroot, &sb->s_root);
1103 if (err)
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001104 goto failed_segctor;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001105
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +09001106 nilfs_put_root(fsroot);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001107
1108 if (!(sb->s_flags & MS_RDONLY)) {
1109 down_write(&nilfs->ns_sem);
Ryusuke Konishif7545142011-03-09 11:05:08 +09001110 nilfs_setup_super(sb, true);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001111 up_write(&nilfs->ns_sem);
1112 }
1113
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001114 return 0;
1115
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001116 failed_segctor:
Ryusuke Konishif7545142011-03-09 11:05:08 +09001117 nilfs_detach_log_writer(sb);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001118
1119 failed_checkpoint:
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +09001120 nilfs_put_root(fsroot);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001121
Ryusuke Konishif1e89c82010-09-05 12:20:59 +09001122 failed_unload:
1123 iput(nilfs->ns_sufile);
1124 iput(nilfs->ns_cpfile);
1125 iput(nilfs->ns_dat);
1126
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001127 failed_nilfs:
1128 destroy_nilfs(nilfs);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001129 return err;
1130}
1131
1132static int nilfs_remount(struct super_block *sb, int *flags, char *data)
1133{
Ryusuke Konishie3154e92011-03-09 11:05:08 +09001134 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001135 unsigned long old_sb_flags;
Ryusuke Konishi06df0f92010-12-27 00:04:06 +09001136 unsigned long old_mount_opt;
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001137 int err;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001138
Theodore Ts'o02b99842014-03-13 10:14:33 -04001139 sync_filesystem(sb);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001140 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
David Howells2b0143b2015-03-17 22:25:59 +00001196 root = NILFS_I(d_inode(sb->s_root))->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) {
Al Viroe95c3112013-08-24 12:06:16 -04001334 if (nilfs_tree_is_busy(s->s_root)) {
1335 if ((flags ^ s->s_flags) & MS_RDONLY) {
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001336 printk(KERN_ERR "NILFS: the device already "
1337 "has a %s mount.\n",
1338 (s->s_flags & MS_RDONLY) ?
1339 "read-only" : "read/write");
1340 err = -EBUSY;
1341 goto failed_super;
1342 }
Al Viroe95c3112013-08-24 12:06:16 -04001343 } else {
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001344 /*
1345 * Try remount to setup mount states if the current
1346 * tree is not mounted and only snapshots use this sb.
1347 */
1348 err = nilfs_remount(s, &flags, data);
1349 if (err)
1350 goto failed_super;
1351 }
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001352 }
1353
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001354 if (sd.cno) {
1355 err = nilfs_attach_snapshot(s, sd.cno, &root_dentry);
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001356 if (err)
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001357 goto failed_super;
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001358 } else {
1359 root_dentry = dget(s->s_root);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001360 }
1361
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001362 if (!s_new)
Tejun Heod4d77622010-11-13 11:55:18 +01001363 blkdev_put(sd.bdev, mode);
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001364
Al Viroe4c59d62010-07-26 12:19:34 +04001365 return root_dentry;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001366
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001367 failed_super:
Al Viroa95161a2009-08-09 00:52:02 +04001368 deactivate_locked_super(s);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001369
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001370 failed:
1371 if (!s_new)
Tejun Heod4d77622010-11-13 11:55:18 +01001372 blkdev_put(sd.bdev, mode);
Al Viroe4c59d62010-07-26 12:19:34 +04001373 return ERR_PTR(err);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001374}
1375
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001376struct file_system_type nilfs_fs_type = {
1377 .owner = THIS_MODULE,
1378 .name = "nilfs2",
Al Viroe4c59d62010-07-26 12:19:34 +04001379 .mount = nilfs_mount,
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001380 .kill_sb = kill_block_super,
1381 .fs_flags = FS_REQUIRES_DEV,
1382};
Eric W. Biederman7f78e032013-03-02 19:39:14 -08001383MODULE_ALIAS_FS("nilfs2");
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001384
Li Hong41c88bd2010-04-06 00:54:11 +08001385static void nilfs_inode_init_once(void *obj)
1386{
1387 struct nilfs_inode_info *ii = obj;
1388
1389 INIT_LIST_HEAD(&ii->i_dirty);
1390#ifdef CONFIG_NILFS_XATTR
1391 init_rwsem(&ii->xattr_sem);
1392#endif
Miklos Szeredi2aa15892011-02-23 13:49:47 +01001393 address_space_init_once(&ii->i_btnode_cache);
Ryusuke Konishi05d0e942010-07-10 20:52:09 +09001394 ii->i_bmap = &ii->i_bmap_data;
Li Hong41c88bd2010-04-06 00:54:11 +08001395 inode_init_once(&ii->vfs_inode);
1396}
1397
1398static void nilfs_segbuf_init_once(void *obj)
1399{
1400 memset(obj, 0, sizeof(struct nilfs_segment_buffer));
1401}
1402
1403static void nilfs_destroy_cachep(void)
1404{
Kirill A. Shutemov8c0a8532012-09-26 11:33:07 +10001405 /*
1406 * Make sure all delayed rcu free inodes are flushed before we
1407 * destroy cache.
1408 */
1409 rcu_barrier();
1410
Julia Lawallda80a392015-11-06 16:31:40 -08001411 kmem_cache_destroy(nilfs_inode_cachep);
1412 kmem_cache_destroy(nilfs_transaction_cachep);
1413 kmem_cache_destroy(nilfs_segbuf_cachep);
1414 kmem_cache_destroy(nilfs_btree_path_cache);
Li Hong41c88bd2010-04-06 00:54:11 +08001415}
1416
1417static int __init nilfs_init_cachep(void)
1418{
1419 nilfs_inode_cachep = kmem_cache_create("nilfs2_inode_cache",
1420 sizeof(struct nilfs_inode_info), 0,
1421 SLAB_RECLAIM_ACCOUNT, nilfs_inode_init_once);
1422 if (!nilfs_inode_cachep)
1423 goto fail;
1424
1425 nilfs_transaction_cachep = kmem_cache_create("nilfs2_transaction_cache",
1426 sizeof(struct nilfs_transaction_info), 0,
1427 SLAB_RECLAIM_ACCOUNT, NULL);
1428 if (!nilfs_transaction_cachep)
1429 goto fail;
1430
1431 nilfs_segbuf_cachep = kmem_cache_create("nilfs2_segbuf_cache",
1432 sizeof(struct nilfs_segment_buffer), 0,
1433 SLAB_RECLAIM_ACCOUNT, nilfs_segbuf_init_once);
1434 if (!nilfs_segbuf_cachep)
1435 goto fail;
1436
1437 nilfs_btree_path_cache = kmem_cache_create("nilfs2_btree_path_cache",
1438 sizeof(struct nilfs_btree_path) * NILFS_BTREE_LEVEL_MAX,
1439 0, 0, NULL);
1440 if (!nilfs_btree_path_cache)
1441 goto fail;
1442
1443 return 0;
1444
1445fail:
1446 nilfs_destroy_cachep();
1447 return -ENOMEM;
1448}
1449
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001450static int __init init_nilfs_fs(void)
1451{
1452 int err;
1453
Li Hong41c88bd2010-04-06 00:54:11 +08001454 err = nilfs_init_cachep();
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001455 if (err)
Li Hong41c88bd2010-04-06 00:54:11 +08001456 goto fail;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001457
Vyacheslav Dubeykodd70edb2014-08-08 14:20:55 -07001458 err = nilfs_sysfs_init();
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001459 if (err)
Li Hong41c88bd2010-04-06 00:54:11 +08001460 goto free_cachep;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001461
Vyacheslav Dubeykodd70edb2014-08-08 14:20:55 -07001462 err = register_filesystem(&nilfs_fs_type);
1463 if (err)
1464 goto deinit_sysfs_entry;
1465
Li Hong9f130262010-04-09 23:09:53 +08001466 printk(KERN_INFO "NILFS version 2 loaded\n");
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001467 return 0;
1468
Vyacheslav Dubeykodd70edb2014-08-08 14:20:55 -07001469deinit_sysfs_entry:
1470 nilfs_sysfs_exit();
Li Hong41c88bd2010-04-06 00:54:11 +08001471free_cachep:
1472 nilfs_destroy_cachep();
1473fail:
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001474 return err;
1475}
1476
1477static void __exit exit_nilfs_fs(void)
1478{
Li Hong41c88bd2010-04-06 00:54:11 +08001479 nilfs_destroy_cachep();
Vyacheslav Dubeykodd70edb2014-08-08 14:20:55 -07001480 nilfs_sysfs_exit();
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001481 unregister_filesystem(&nilfs_fs_type);
1482}
1483
1484module_init(init_nilfs_fs)
1485module_exit(exit_nilfs_fs)