blob: f47585bfeb0169eee1198d01493e1d54705dabba [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;
364 int sb2i = -1; /* array index of the secondary superblock */
365 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;
375 }
376 if (sb2i >= 0 && (u64)blocknr << nilfs->ns_blocksize_bits == sb2off)
377 goto out; /* super block location is unchanged */
378
379 /* Get new super block buffer */
380 newblocknr = sb2off >> nilfs->ns_blocksize_bits;
381 offset = sb2off & (nilfs->ns_blocksize - 1);
382 nsbh = sb_getblk(sb, newblocknr);
383 if (!nsbh) {
384 printk(KERN_WARNING
385 "NILFS warning: unable to move secondary superblock "
386 "to block %llu\n", (unsigned long long)newblocknr);
387 ret = -EIO;
388 goto out;
389 }
390 nsbp = (void *)nsbh->b_data + offset;
391 memset(nsbp, 0, nilfs->ns_blocksize);
392
393 if (sb2i >= 0) {
394 memcpy(nsbp, nilfs->ns_sbp[sb2i], nilfs->ns_sbsize);
395 brelse(nilfs->ns_sbh[sb2i]);
396 nilfs->ns_sbh[sb2i] = nsbh;
397 nilfs->ns_sbp[sb2i] = nsbp;
398 } else if (nilfs->ns_sbh[0]->b_blocknr < nilfs->ns_first_data_block) {
399 /* secondary super block will be restored to index 1 */
400 nilfs->ns_sbh[1] = nsbh;
401 nilfs->ns_sbp[1] = nsbp;
402 } else {
403 brelse(nsbh);
404 }
405out:
406 return ret;
407}
408
Ryusuke Konishi4e33f9e2011-05-05 01:23:58 +0900409/**
410 * nilfs_resize_fs - resize the filesystem
411 * @sb: super block instance
412 * @newsize: new size of the filesystem (in bytes)
413 */
414int nilfs_resize_fs(struct super_block *sb, __u64 newsize)
415{
416 struct the_nilfs *nilfs = sb->s_fs_info;
417 struct nilfs_super_block **sbp;
418 __u64 devsize, newnsegs;
419 loff_t sb2off;
420 int ret;
421
422 ret = -ERANGE;
423 devsize = i_size_read(sb->s_bdev->bd_inode);
424 if (newsize > devsize)
425 goto out;
426
427 /*
428 * Write lock is required to protect some functions depending
429 * on the number of segments, the number of reserved segments,
430 * and so forth.
431 */
432 down_write(&nilfs->ns_segctor_sem);
433
434 sb2off = NILFS_SB2_OFFSET_BYTES(newsize);
435 newnsegs = sb2off >> nilfs->ns_blocksize_bits;
436 do_div(newnsegs, nilfs->ns_blocks_per_segment);
437
438 ret = nilfs_sufile_resize(nilfs->ns_sufile, newnsegs);
439 up_write(&nilfs->ns_segctor_sem);
440 if (ret < 0)
441 goto out;
442
443 ret = nilfs_construct_segment(sb);
444 if (ret < 0)
445 goto out;
446
447 down_write(&nilfs->ns_sem);
448 nilfs_move_2nd_super(sb, sb2off);
449 ret = -EIO;
450 sbp = nilfs_prepare_super(sb, 0);
451 if (likely(sbp)) {
452 nilfs_set_log_cursor(sbp[0], nilfs);
453 /*
454 * Drop NILFS_RESIZE_FS flag for compatibility with
455 * mount-time resize which may be implemented in a
456 * future release.
457 */
458 sbp[0]->s_state = cpu_to_le16(le16_to_cpu(sbp[0]->s_state) &
459 ~NILFS_RESIZE_FS);
460 sbp[0]->s_dev_size = cpu_to_le64(newsize);
461 sbp[0]->s_nsegments = cpu_to_le64(nilfs->ns_nsegments);
462 if (sbp[1])
463 memcpy(sbp[1], sbp[0], nilfs->ns_sbsize);
464 ret = nilfs_commit_super(sb, NILFS_SB_COMMIT_ALL);
465 }
466 up_write(&nilfs->ns_sem);
467
468 /*
469 * Reset the range of allocatable segments last. This order
470 * is important in the case of expansion because the secondary
471 * superblock must be protected from log write until migration
472 * completes.
473 */
474 if (!ret)
475 nilfs_sufile_set_alloc_range(nilfs->ns_sufile, 0, newnsegs - 1);
476out:
477 return ret;
478}
479
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700480static void nilfs_put_super(struct super_block *sb)
481{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900482 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700483
Ryusuke Konishif7545142011-03-09 11:05:08 +0900484 nilfs_detach_log_writer(sb);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700485
486 if (!(sb->s_flags & MS_RDONLY)) {
487 down_write(&nilfs->ns_sem);
Ryusuke Konishif7545142011-03-09 11:05:08 +0900488 nilfs_cleanup_super(sb);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700489 up_write(&nilfs->ns_sem);
490 }
491
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900492 iput(nilfs->ns_sufile);
493 iput(nilfs->ns_cpfile);
494 iput(nilfs->ns_dat);
495
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +0900496 destroy_nilfs(nilfs);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700497 sb->s_fs_info = NULL;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700498}
499
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700500static int nilfs_sync_fs(struct super_block *sb, int wait)
501{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900502 struct the_nilfs *nilfs = sb->s_fs_info;
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900503 struct nilfs_super_block **sbp;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700504 int err = 0;
505
506 /* This function is called when super block should be written back */
507 if (wait)
508 err = nilfs_construct_segment(sb);
Jiro SEKIBA6233caa2009-07-23 01:26:33 +0900509
510 down_write(&nilfs->ns_sem);
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900511 if (nilfs_sb_dirty(nilfs)) {
Ryusuke Konishif7545142011-03-09 11:05:08 +0900512 sbp = nilfs_prepare_super(sb, nilfs_sb_will_flip(nilfs));
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900513 if (likely(sbp)) {
514 nilfs_set_log_cursor(sbp[0], nilfs);
Ryusuke Konishif7545142011-03-09 11:05:08 +0900515 nilfs_commit_super(sb, NILFS_SB_COMMIT);
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900516 }
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900517 }
Jiro SEKIBA6233caa2009-07-23 01:26:33 +0900518 up_write(&nilfs->ns_sem);
519
Andreas Rohnere2c76172014-10-13 15:53:20 -0700520 if (!err)
521 err = nilfs_flush_device(nilfs);
522
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700523 return err;
524}
525
Ryusuke Konishif7545142011-03-09 11:05:08 +0900526int nilfs_attach_checkpoint(struct super_block *sb, __u64 cno, int curr_mnt,
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900527 struct nilfs_root **rootp)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700528{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900529 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900530 struct nilfs_root *root;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700531 struct nilfs_checkpoint *raw_cp;
532 struct buffer_head *bh_cp;
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900533 int err = -ENOMEM;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700534
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900535 root = nilfs_find_or_create_root(
536 nilfs, curr_mnt ? NILFS_CPTREE_CURRENT_CNO : cno);
537 if (!root)
538 return err;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700539
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900540 if (root->ifile)
541 goto reuse; /* already attached checkpoint */
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700542
Zhang Qiang1154ecb2009-08-18 14:58:24 +0800543 down_read(&nilfs->ns_segctor_sem);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700544 err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, cno, 0, &raw_cp,
545 &bh_cp);
Zhang Qiang1154ecb2009-08-18 14:58:24 +0800546 up_read(&nilfs->ns_segctor_sem);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700547 if (unlikely(err)) {
548 if (err == -ENOENT || err == -EINVAL) {
549 printk(KERN_ERR
550 "NILFS: Invalid checkpoint "
551 "(checkpoint number=%llu)\n",
552 (unsigned long long)cno);
553 err = -EINVAL;
554 }
555 goto failed;
556 }
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900557
Ryusuke Konishif7545142011-03-09 11:05:08 +0900558 err = nilfs_ifile_read(sb, root, nilfs->ns_inode_size,
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900559 &raw_cp->cp_ifile_inode, &root->ifile);
560 if (err)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700561 goto failed_bh;
Ryusuke Konishib7c06342010-08-14 14:48:32 +0900562
Vyacheslav Dubeykoe5f7f842013-07-03 15:08:06 -0700563 atomic64_set(&root->inodes_count,
564 le64_to_cpu(raw_cp->cp_inodes_count));
565 atomic64_set(&root->blocks_count,
566 le64_to_cpu(raw_cp->cp_blocks_count));
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700567
568 nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp);
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900569
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900570 reuse:
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900571 *rootp = root;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700572 return 0;
573
574 failed_bh:
575 nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp);
576 failed:
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900577 nilfs_put_root(root);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700578
579 return err;
580}
581
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900582static int nilfs_freeze(struct super_block *sb)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700583{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900584 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900585 int err;
586
587 if (sb->s_flags & MS_RDONLY)
588 return 0;
589
590 /* Mark super block clean */
591 down_write(&nilfs->ns_sem);
Ryusuke Konishif7545142011-03-09 11:05:08 +0900592 err = nilfs_cleanup_super(sb);
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900593 up_write(&nilfs->ns_sem);
594 return err;
595}
596
597static int nilfs_unfreeze(struct super_block *sb)
598{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900599 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700600
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900601 if (sb->s_flags & MS_RDONLY)
602 return 0;
603
604 down_write(&nilfs->ns_sem);
Ryusuke Konishif7545142011-03-09 11:05:08 +0900605 nilfs_setup_super(sb, false);
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900606 up_write(&nilfs->ns_sem);
607 return 0;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700608}
609
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700610static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf)
611{
612 struct super_block *sb = dentry->d_sb;
David Howells2b0143b2015-03-17 22:25:59 +0000613 struct nilfs_root *root = NILFS_I(d_inode(dentry))->i_root;
Ryusuke Konishib7c06342010-08-14 14:48:32 +0900614 struct the_nilfs *nilfs = root->nilfs;
Ryusuke Konishic306af22009-03-26 10:16:57 +0900615 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700616 unsigned long long blocks;
617 unsigned long overhead;
618 unsigned long nrsvblocks;
619 sector_t nfreeblocks;
Vyacheslav Dubeykoc7ef9722013-07-03 15:08:05 -0700620 u64 nmaxinodes, nfreeinodes;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700621 int err;
622
623 /*
624 * Compute all of the segment blocks
625 *
626 * The blocks before first segment and after last segment
627 * are excluded.
628 */
629 blocks = nilfs->ns_blocks_per_segment * nilfs->ns_nsegments
630 - nilfs->ns_first_data_block;
631 nrsvblocks = nilfs->ns_nrsvsegs * nilfs->ns_blocks_per_segment;
632
633 /*
634 * Compute the overhead
635 *
Ryusuke Konishi7a650042010-03-14 03:32:40 +0900636 * When distributing meta data blocks outside segment structure,
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700637 * We must count them as the overhead.
638 */
639 overhead = 0;
640
641 err = nilfs_count_free_blocks(nilfs, &nfreeblocks);
642 if (unlikely(err))
643 return err;
644
Vyacheslav Dubeykoc7ef9722013-07-03 15:08:05 -0700645 err = nilfs_ifile_count_free_inodes(root->ifile,
646 &nmaxinodes, &nfreeinodes);
647 if (unlikely(err)) {
648 printk(KERN_WARNING
649 "NILFS warning: fail to count free inodes: err %d.\n",
650 err);
651 if (err == -ERANGE) {
652 /*
653 * If nilfs_palloc_count_max_entries() returns
654 * -ERANGE error code then we simply treat
655 * curent inodes count as maximum possible and
656 * zero as free inodes value.
657 */
Vyacheslav Dubeykoe5f7f842013-07-03 15:08:06 -0700658 nmaxinodes = atomic64_read(&root->inodes_count);
Vyacheslav Dubeykoc7ef9722013-07-03 15:08:05 -0700659 nfreeinodes = 0;
660 err = 0;
661 } else
662 return err;
663 }
664
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700665 buf->f_type = NILFS_SUPER_MAGIC;
666 buf->f_bsize = sb->s_blocksize;
667 buf->f_blocks = blocks - overhead;
668 buf->f_bfree = nfreeblocks;
669 buf->f_bavail = (buf->f_bfree >= nrsvblocks) ?
670 (buf->f_bfree - nrsvblocks) : 0;
Vyacheslav Dubeykoc7ef9722013-07-03 15:08:05 -0700671 buf->f_files = nmaxinodes;
672 buf->f_ffree = nfreeinodes;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700673 buf->f_namelen = NILFS_NAME_LEN;
Ryusuke Konishic306af22009-03-26 10:16:57 +0900674 buf->f_fsid.val[0] = (u32)id;
675 buf->f_fsid.val[1] = (u32)(id >> 32);
676
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700677 return 0;
678}
679
Al Viro34c80b12011-12-08 21:32:45 -0500680static int nilfs_show_options(struct seq_file *seq, struct dentry *dentry)
Jiro SEKIBAb58a2852009-06-24 20:06:34 +0900681{
Al Viro34c80b12011-12-08 21:32:45 -0500682 struct super_block *sb = dentry->d_sb;
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900683 struct the_nilfs *nilfs = sb->s_fs_info;
David Howells2b0143b2015-03-17 22:25:59 +0000684 struct nilfs_root *root = NILFS_I(d_inode(dentry))->i_root;
Jiro SEKIBAb58a2852009-06-24 20:06:34 +0900685
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900686 if (!nilfs_test_opt(nilfs, BARRIER))
Ryusuke Konishic6b4d572010-07-05 14:40:27 +0900687 seq_puts(seq, ",nobarrier");
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900688 if (root->cno != NILFS_CPTREE_CURRENT_CNO)
689 seq_printf(seq, ",cp=%llu", (unsigned long long)root->cno);
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900690 if (nilfs_test_opt(nilfs, ERRORS_PANIC))
Ryusuke Konishic6b4d572010-07-05 14:40:27 +0900691 seq_puts(seq, ",errors=panic");
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900692 if (nilfs_test_opt(nilfs, ERRORS_CONT))
Ryusuke Konishic6b4d572010-07-05 14:40:27 +0900693 seq_puts(seq, ",errors=continue");
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900694 if (nilfs_test_opt(nilfs, STRICT_ORDER))
Ryusuke Konishic6b4d572010-07-05 14:40:27 +0900695 seq_puts(seq, ",order=strict");
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900696 if (nilfs_test_opt(nilfs, NORECOVERY))
Ryusuke Konishic6b4d572010-07-05 14:40:27 +0900697 seq_puts(seq, ",norecovery");
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900698 if (nilfs_test_opt(nilfs, DISCARD))
Ryusuke Konishic6b4d572010-07-05 14:40:27 +0900699 seq_puts(seq, ",discard");
Jiro SEKIBAb58a2852009-06-24 20:06:34 +0900700
701 return 0;
702}
703
Alexey Dobriyanb87221d2009-09-21 17:01:09 -0700704static const struct super_operations nilfs_sops = {
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700705 .alloc_inode = nilfs_alloc_inode,
706 .destroy_inode = nilfs_destroy_inode,
707 .dirty_inode = nilfs_dirty_inode,
Al Viro6fd1e5c2010-06-07 11:55:00 -0400708 .evict_inode = nilfs_evict_inode,
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700709 .put_super = nilfs_put_super,
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700710 .sync_fs = nilfs_sync_fs,
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900711 .freeze_fs = nilfs_freeze,
712 .unfreeze_fs = nilfs_unfreeze,
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700713 .statfs = nilfs_statfs,
714 .remount_fs = nilfs_remount,
Jiro SEKIBAb58a2852009-06-24 20:06:34 +0900715 .show_options = nilfs_show_options
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700716};
717
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700718enum {
719 Opt_err_cont, Opt_err_panic, Opt_err_ro,
Ryusuke Konishi773bc4f2010-07-05 13:00:08 +0900720 Opt_barrier, Opt_nobarrier, Opt_snapshot, Opt_order, Opt_norecovery,
Ryusuke Konishi802d3172010-07-05 14:27:04 +0900721 Opt_discard, Opt_nodiscard, Opt_err,
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700722};
723
724static match_table_t tokens = {
725 {Opt_err_cont, "errors=continue"},
726 {Opt_err_panic, "errors=panic"},
727 {Opt_err_ro, "errors=remount-ro"},
Ryusuke Konishi773bc4f2010-07-05 13:00:08 +0900728 {Opt_barrier, "barrier"},
Jiro SEKIBA91f19532009-11-12 14:07:26 +0900729 {Opt_nobarrier, "nobarrier"},
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700730 {Opt_snapshot, "cp=%u"},
731 {Opt_order, "order=%s"},
Ryusuke Konishi02345762009-11-20 03:28:01 +0900732 {Opt_norecovery, "norecovery"},
Jiro SEKIBAe902ec92010-01-30 18:06:35 +0900733 {Opt_discard, "discard"},
Ryusuke Konishi802d3172010-07-05 14:27:04 +0900734 {Opt_nodiscard, "nodiscard"},
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700735 {Opt_err, NULL}
736};
737
Ryusuke Konishi7c017452010-07-05 20:08:33 +0900738static int parse_options(char *options, struct super_block *sb, int is_remount)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700739{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900740 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700741 char *p;
742 substring_t args[MAX_OPT_ARGS];
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700743
744 if (!options)
745 return 1;
746
747 while ((p = strsep(&options, ",")) != NULL) {
748 int token;
749 if (!*p)
750 continue;
751
752 token = match_token(p, tokens, args);
753 switch (token) {
Ryusuke Konishi773bc4f2010-07-05 13:00:08 +0900754 case Opt_barrier:
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900755 nilfs_set_opt(nilfs, BARRIER);
Ryusuke Konishi773bc4f2010-07-05 13:00:08 +0900756 break;
Jiro SEKIBA91f19532009-11-12 14:07:26 +0900757 case Opt_nobarrier:
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900758 nilfs_clear_opt(nilfs, BARRIER);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700759 break;
760 case Opt_order:
761 if (strcmp(args[0].from, "relaxed") == 0)
762 /* Ordered data semantics */
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900763 nilfs_clear_opt(nilfs, STRICT_ORDER);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700764 else if (strcmp(args[0].from, "strict") == 0)
765 /* Strict in-order semantics */
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900766 nilfs_set_opt(nilfs, STRICT_ORDER);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700767 else
768 return 0;
769 break;
770 case Opt_err_panic:
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900771 nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_PANIC);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700772 break;
773 case Opt_err_ro:
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900774 nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_RO);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700775 break;
776 case Opt_err_cont:
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900777 nilfs_write_opt(nilfs, ERROR_MODE, ERRORS_CONT);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700778 break;
779 case Opt_snapshot:
Ryusuke Konishi7c017452010-07-05 20:08:33 +0900780 if (is_remount) {
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900781 printk(KERN_ERR
782 "NILFS: \"%s\" option is invalid "
783 "for remount.\n", p);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700784 return 0;
Ryusuke Konishi7c017452010-07-05 20:08:33 +0900785 }
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700786 break;
Ryusuke Konishi02345762009-11-20 03:28:01 +0900787 case Opt_norecovery:
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900788 nilfs_set_opt(nilfs, NORECOVERY);
Ryusuke Konishi02345762009-11-20 03:28:01 +0900789 break;
Jiro SEKIBAe902ec92010-01-30 18:06:35 +0900790 case Opt_discard:
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900791 nilfs_set_opt(nilfs, DISCARD);
Jiro SEKIBAe902ec92010-01-30 18:06:35 +0900792 break;
Ryusuke Konishi802d3172010-07-05 14:27:04 +0900793 case Opt_nodiscard:
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900794 nilfs_clear_opt(nilfs, DISCARD);
Ryusuke Konishi802d3172010-07-05 14:27:04 +0900795 break;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700796 default:
797 printk(KERN_ERR
798 "NILFS: Unrecognized mount option \"%s\"\n", p);
799 return 0;
800 }
801 }
802 return 1;
803}
804
805static inline void
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900806nilfs_set_default_options(struct super_block *sb,
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700807 struct nilfs_super_block *sbp)
808{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900809 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900810
811 nilfs->ns_mount_opt =
Ryusuke Konishi277a6a32010-04-02 18:02:33 +0900812 NILFS_MOUNT_ERRORS_RO | NILFS_MOUNT_BARRIER;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700813}
814
Ryusuke Konishif7545142011-03-09 11:05:08 +0900815static int nilfs_setup_super(struct super_block *sb, int is_mount)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700816{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900817 struct the_nilfs *nilfs = sb->s_fs_info;
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900818 struct nilfs_super_block **sbp;
819 int max_mnt_count;
820 int mnt_count;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700821
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900822 /* nilfs->ns_sem must be locked by the caller. */
Ryusuke Konishif7545142011-03-09 11:05:08 +0900823 sbp = nilfs_prepare_super(sb, 0);
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900824 if (!sbp)
825 return -EIO;
826
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900827 if (!is_mount)
828 goto skip_mount_setup;
829
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900830 max_mnt_count = le16_to_cpu(sbp[0]->s_max_mnt_count);
831 mnt_count = le16_to_cpu(sbp[0]->s_mnt_count);
832
Ryusuke Konishif50a4c82009-11-19 16:58:40 +0900833 if (nilfs->ns_mount_state & NILFS_ERROR_FS) {
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700834 printk(KERN_WARNING
835 "NILFS warning: mounting fs with errors\n");
836#if 0
837 } else if (max_mnt_count >= 0 && mnt_count >= max_mnt_count) {
838 printk(KERN_WARNING
839 "NILFS warning: maximal mount count reached\n");
840#endif
841 }
842 if (!max_mnt_count)
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900843 sbp[0]->s_max_mnt_count = cpu_to_le16(NILFS_DFL_MAX_MNT_COUNT);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700844
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900845 sbp[0]->s_mnt_count = cpu_to_le16(mnt_count + 1);
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900846 sbp[0]->s_mtime = cpu_to_le64(get_seconds());
847
848skip_mount_setup:
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900849 sbp[0]->s_state =
850 cpu_to_le16(le16_to_cpu(sbp[0]->s_state) & ~NILFS_VALID_FS);
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900851 /* synchronize sbp[1] with sbp[0] */
Ryusuke Konishi0ca7a5b2011-01-21 16:40:31 +0900852 if (sbp[1])
853 memcpy(sbp[1], sbp[0], nilfs->ns_sbsize);
Ryusuke Konishif7545142011-03-09 11:05:08 +0900854 return nilfs_commit_super(sb, NILFS_SB_COMMIT_ALL);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700855}
856
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700857struct nilfs_super_block *nilfs_read_super_block(struct super_block *sb,
858 u64 pos, int blocksize,
859 struct buffer_head **pbh)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700860{
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700861 unsigned long long sb_index = pos;
862 unsigned long offset;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700863
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700864 offset = do_div(sb_index, blocksize);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700865 *pbh = sb_bread(sb, sb_index);
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700866 if (!*pbh)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700867 return NULL;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700868 return (struct nilfs_super_block *)((char *)(*pbh)->b_data + offset);
869}
870
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700871int nilfs_store_magic_and_option(struct super_block *sb,
872 struct nilfs_super_block *sbp,
873 char *data)
874{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900875 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700876
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700877 sb->s_magic = le16_to_cpu(sbp->s_magic);
878
879 /* FS independent flags */
880#ifdef NILFS_ATIME_DISABLE
881 sb->s_flags |= MS_NOATIME;
882#endif
883
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +0900884 nilfs_set_default_options(sb, sbp);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700885
Ryusuke Konishi574e6c32011-03-09 11:05:07 +0900886 nilfs->ns_resuid = le16_to_cpu(sbp->s_def_resuid);
887 nilfs->ns_resgid = le16_to_cpu(sbp->s_def_resgid);
888 nilfs->ns_interval = le32_to_cpu(sbp->s_c_interval);
889 nilfs->ns_watermark = le32_to_cpu(sbp->s_c_block_max);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700890
Ryusuke Konishi7c017452010-07-05 20:08:33 +0900891 return !parse_options(data, sb, 0) ? -EINVAL : 0 ;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700892}
893
Ryusuke Konishic5ca48a2010-07-22 03:22:20 +0900894int nilfs_check_feature_compatibility(struct super_block *sb,
895 struct nilfs_super_block *sbp)
896{
897 __u64 features;
898
899 features = le64_to_cpu(sbp->s_feature_incompat) &
900 ~NILFS_FEATURE_INCOMPAT_SUPP;
901 if (features) {
902 printk(KERN_ERR "NILFS: couldn't mount because of unsupported "
903 "optional features (%llx)\n",
904 (unsigned long long)features);
905 return -EINVAL;
906 }
907 features = le64_to_cpu(sbp->s_feature_compat_ro) &
908 ~NILFS_FEATURE_COMPAT_RO_SUPP;
909 if (!(sb->s_flags & MS_RDONLY) && features) {
910 printk(KERN_ERR "NILFS: couldn't mount RDWR because of "
911 "unsupported optional features (%llx)\n",
912 (unsigned long long)features);
913 return -EINVAL;
914 }
915 return 0;
916}
917
Ryusuke Konishi367ea332010-08-26 01:52:51 +0900918static int nilfs_get_root_dentry(struct super_block *sb,
919 struct nilfs_root *root,
920 struct dentry **root_dentry)
921{
922 struct inode *inode;
923 struct dentry *dentry;
924 int ret = 0;
925
926 inode = nilfs_iget(sb, root, NILFS_ROOT_INO);
927 if (IS_ERR(inode)) {
928 printk(KERN_ERR "NILFS: get root inode failed\n");
929 ret = PTR_ERR(inode);
930 goto out;
931 }
932 if (!S_ISDIR(inode->i_mode) || !inode->i_blocks || !inode->i_size) {
933 iput(inode);
934 printk(KERN_ERR "NILFS: corrupt root inode.\n");
935 ret = -EINVAL;
936 goto out;
937 }
938
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900939 if (root->cno == NILFS_CPTREE_CURRENT_CNO) {
940 dentry = d_find_alias(inode);
941 if (!dentry) {
Al Viro48fde702012-01-08 22:15:13 -0500942 dentry = d_make_root(inode);
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900943 if (!dentry) {
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900944 ret = -ENOMEM;
945 goto failed_dentry;
946 }
947 } else {
948 iput(inode);
949 }
950 } else {
J. Bruce Fields1a0a3972014-02-14 17:35:37 -0500951 dentry = d_obtain_root(inode);
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900952 if (IS_ERR(dentry)) {
953 ret = PTR_ERR(dentry);
954 goto failed_dentry;
955 }
Ryusuke Konishi367ea332010-08-26 01:52:51 +0900956 }
957 *root_dentry = dentry;
958 out:
959 return ret;
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900960
961 failed_dentry:
962 printk(KERN_ERR "NILFS: get root dentry failed\n");
963 goto out;
Ryusuke Konishi367ea332010-08-26 01:52:51 +0900964}
965
Ryusuke Konishiab4d8f72010-08-26 02:15:41 +0900966static int nilfs_attach_snapshot(struct super_block *s, __u64 cno,
967 struct dentry **root_dentry)
968{
Ryusuke Konishie3154e92011-03-09 11:05:08 +0900969 struct the_nilfs *nilfs = s->s_fs_info;
Ryusuke Konishiab4d8f72010-08-26 02:15:41 +0900970 struct nilfs_root *root;
971 int ret;
972
Ryusuke Konishi572d8b32012-07-30 14:42:07 -0700973 mutex_lock(&nilfs->ns_snapshot_mount_mutex);
974
Ryusuke Konishiab4d8f72010-08-26 02:15:41 +0900975 down_read(&nilfs->ns_segctor_sem);
976 ret = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile, cno);
977 up_read(&nilfs->ns_segctor_sem);
978 if (ret < 0) {
979 ret = (ret == -ENOENT) ? -EINVAL : ret;
980 goto out;
981 } else if (!ret) {
982 printk(KERN_ERR "NILFS: The specified checkpoint is "
983 "not a snapshot (checkpoint number=%llu).\n",
984 (unsigned long long)cno);
985 ret = -EINVAL;
986 goto out;
987 }
988
Ryusuke Konishif7545142011-03-09 11:05:08 +0900989 ret = nilfs_attach_checkpoint(s, cno, false, &root);
Ryusuke Konishiab4d8f72010-08-26 02:15:41 +0900990 if (ret) {
991 printk(KERN_ERR "NILFS: error loading snapshot "
992 "(checkpoint number=%llu).\n",
993 (unsigned long long)cno);
994 goto out;
995 }
996 ret = nilfs_get_root_dentry(s, root, root_dentry);
997 nilfs_put_root(root);
998 out:
Ryusuke Konishi572d8b32012-07-30 14:42:07 -0700999 mutex_unlock(&nilfs->ns_snapshot_mount_mutex);
Ryusuke Konishiab4d8f72010-08-26 02:15:41 +09001000 return ret;
1001}
1002
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001003/**
Al Viroe95c3112013-08-24 12:06:16 -04001004 * nilfs_tree_is_busy() - try to shrink dentries of a checkpoint
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001005 * @root_dentry: root dentry of the tree to be shrunk
1006 *
1007 * This function returns true if the tree was in-use.
1008 */
Al Viroe95c3112013-08-24 12:06:16 -04001009static bool nilfs_tree_is_busy(struct dentry *root_dentry)
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001010{
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001011 shrink_dcache_parent(root_dentry);
Al Viroe95c3112013-08-24 12:06:16 -04001012 return d_count(root_dentry) > 1;
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001013}
1014
Ryusuke Konishi032dbb32010-09-13 11:16:34 +09001015int nilfs_checkpoint_is_mounted(struct super_block *sb, __u64 cno)
1016{
Ryusuke Konishie3154e92011-03-09 11:05:08 +09001017 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi032dbb32010-09-13 11:16:34 +09001018 struct nilfs_root *root;
1019 struct inode *inode;
1020 struct dentry *dentry;
1021 int ret;
1022
Ryusuke Konishi3377f842015-04-16 12:46:45 -07001023 if (cno > nilfs->ns_cno)
Ryusuke Konishi032dbb32010-09-13 11:16:34 +09001024 return false;
1025
1026 if (cno >= nilfs_last_cno(nilfs))
1027 return true; /* protect recent checkpoints */
1028
1029 ret = false;
Ryusuke Konishie3154e92011-03-09 11:05:08 +09001030 root = nilfs_lookup_root(nilfs, cno);
Ryusuke Konishi032dbb32010-09-13 11:16:34 +09001031 if (root) {
1032 inode = nilfs_ilookup(sb, root, NILFS_ROOT_INO);
1033 if (inode) {
1034 dentry = d_find_alias(inode);
1035 if (dentry) {
Al Viroe95c3112013-08-24 12:06:16 -04001036 ret = nilfs_tree_is_busy(dentry);
Ryusuke Konishi032dbb32010-09-13 11:16:34 +09001037 dput(dentry);
1038 }
1039 iput(inode);
1040 }
1041 nilfs_put_root(root);
1042 }
1043 return ret;
1044}
1045
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001046/**
1047 * nilfs_fill_super() - initialize a super block instance
1048 * @sb: super_block
1049 * @data: mount options
1050 * @silent: silent mode flag
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001051 *
Ryusuke Konishiaa7dfb82009-06-08 01:39:33 +09001052 * This function is called exclusively by nilfs->ns_mount_mutex.
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001053 * So, the recovery process is protected from other simultaneous mounts.
1054 */
1055static int
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001056nilfs_fill_super(struct super_block *sb, void *data, int silent)
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001057{
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001058 struct the_nilfs *nilfs;
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +09001059 struct nilfs_root *fsroot;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001060 __u64 cno;
1061 int err;
1062
Ryusuke Konishie3154e92011-03-09 11:05:08 +09001063 nilfs = alloc_nilfs(sb->s_bdev);
1064 if (!nilfs)
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001065 return -ENOMEM;
1066
Ryusuke Konishie3154e92011-03-09 11:05:08 +09001067 sb->s_fs_info = nilfs;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001068
Ryusuke Konishif7545142011-03-09 11:05:08 +09001069 err = init_nilfs(nilfs, sb, (char *)data);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001070 if (err)
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001071 goto failed_nilfs;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001072
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001073 sb->s_op = &nilfs_sops;
1074 sb->s_export_op = &nilfs_export_ops;
1075 sb->s_root = NULL;
Ryusuke Konishi61239232009-04-06 19:02:00 -07001076 sb->s_time_gran = 1;
Al Viro8de52772012-02-06 12:45:27 -05001077 sb->s_max_links = NILFS_LINK_MAX;
Ryusuke Konishi026a7d62010-10-07 14:19:48 +09001078
Christoph Hellwig26ff1302015-01-14 10:42:35 +01001079 sb->s_bdi = &bdev_get_queue(sb->s_bdev)->backing_dev_info;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001080
Ryusuke Konishif7545142011-03-09 11:05:08 +09001081 err = load_nilfs(nilfs, sb);
Ryusuke Konishif50a4c82009-11-19 16:58:40 +09001082 if (err)
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001083 goto failed_nilfs;
Ryusuke Konishif50a4c82009-11-19 16:58:40 +09001084
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001085 cno = nilfs_last_cno(nilfs);
Ryusuke Konishif7545142011-03-09 11:05:08 +09001086 err = nilfs_attach_checkpoint(sb, cno, true, &fsroot);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001087 if (err) {
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001088 printk(KERN_ERR "NILFS: error loading last checkpoint "
1089 "(checkpoint number=%llu).\n", (unsigned long long)cno);
Ryusuke Konishif1e89c82010-09-05 12:20:59 +09001090 goto failed_unload;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001091 }
1092
1093 if (!(sb->s_flags & MS_RDONLY)) {
Ryusuke Konishif7545142011-03-09 11:05:08 +09001094 err = nilfs_attach_log_writer(sb, fsroot);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001095 if (err)
1096 goto failed_checkpoint;
1097 }
1098
Ryusuke Konishi367ea332010-08-26 01:52:51 +09001099 err = nilfs_get_root_dentry(sb, fsroot, &sb->s_root);
1100 if (err)
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001101 goto failed_segctor;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001102
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +09001103 nilfs_put_root(fsroot);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001104
1105 if (!(sb->s_flags & MS_RDONLY)) {
1106 down_write(&nilfs->ns_sem);
Ryusuke Konishif7545142011-03-09 11:05:08 +09001107 nilfs_setup_super(sb, true);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001108 up_write(&nilfs->ns_sem);
1109 }
1110
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001111 return 0;
1112
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001113 failed_segctor:
Ryusuke Konishif7545142011-03-09 11:05:08 +09001114 nilfs_detach_log_writer(sb);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001115
1116 failed_checkpoint:
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +09001117 nilfs_put_root(fsroot);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001118
Ryusuke Konishif1e89c82010-09-05 12:20:59 +09001119 failed_unload:
1120 iput(nilfs->ns_sufile);
1121 iput(nilfs->ns_cpfile);
1122 iput(nilfs->ns_dat);
1123
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001124 failed_nilfs:
1125 destroy_nilfs(nilfs);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001126 return err;
1127}
1128
1129static int nilfs_remount(struct super_block *sb, int *flags, char *data)
1130{
Ryusuke Konishie3154e92011-03-09 11:05:08 +09001131 struct the_nilfs *nilfs = sb->s_fs_info;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001132 unsigned long old_sb_flags;
Ryusuke Konishi06df0f92010-12-27 00:04:06 +09001133 unsigned long old_mount_opt;
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001134 int err;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001135
Theodore Ts'o02b99842014-03-13 10:14:33 -04001136 sync_filesystem(sb);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001137 old_sb_flags = sb->s_flags;
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +09001138 old_mount_opt = nilfs->ns_mount_opt;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001139
Ryusuke Konishi7c017452010-07-05 20:08:33 +09001140 if (!parse_options(data, sb, 1)) {
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001141 err = -EINVAL;
1142 goto restore_opts;
1143 }
1144 sb->s_flags = (sb->s_flags & ~MS_POSIXACL);
1145
Ryusuke Konishid240e062010-05-09 21:51:53 +09001146 err = -EINVAL;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001147
Ryusuke Konishi02345762009-11-20 03:28:01 +09001148 if (!nilfs_valid_fs(nilfs)) {
1149 printk(KERN_WARNING "NILFS (device %s): couldn't "
1150 "remount because the filesystem is in an "
1151 "incomplete recovery state.\n", sb->s_id);
Ryusuke Konishi02345762009-11-20 03:28:01 +09001152 goto restore_opts;
1153 }
1154
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001155 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
1156 goto out;
1157 if (*flags & MS_RDONLY) {
Ryusuke Konishif7545142011-03-09 11:05:08 +09001158 /* Shutting down log writer */
1159 nilfs_detach_log_writer(sb);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001160 sb->s_flags |= MS_RDONLY;
1161
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001162 /*
1163 * Remounting a valid RW partition RDONLY, so set
1164 * the RDONLY flag and then mark the partition as valid again.
1165 */
1166 down_write(&nilfs->ns_sem);
Ryusuke Konishif7545142011-03-09 11:05:08 +09001167 nilfs_cleanup_super(sb);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001168 up_write(&nilfs->ns_sem);
1169 } else {
Ryusuke Konishic5ca48a2010-07-22 03:22:20 +09001170 __u64 features;
Ryusuke Konishie912a5b2010-08-14 13:07:15 +09001171 struct nilfs_root *root;
Ryusuke Konishic5ca48a2010-07-22 03:22:20 +09001172
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001173 /*
1174 * Mounting a RDONLY partition read-write, so reread and
1175 * store the current valid flag. (It may have been changed
1176 * by fsck since we originally mounted the partition.)
1177 */
Ryusuke Konishic5ca48a2010-07-22 03:22:20 +09001178 down_read(&nilfs->ns_sem);
1179 features = le64_to_cpu(nilfs->ns_sbp[0]->s_feature_compat_ro) &
1180 ~NILFS_FEATURE_COMPAT_RO_SUPP;
1181 up_read(&nilfs->ns_sem);
1182 if (features) {
1183 printk(KERN_WARNING "NILFS (device %s): couldn't "
1184 "remount RDWR because of unsupported optional "
1185 "features (%llx)\n",
1186 sb->s_id, (unsigned long long)features);
1187 err = -EROFS;
1188 goto restore_opts;
1189 }
1190
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001191 sb->s_flags &= ~MS_RDONLY;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001192
David Howells2b0143b2015-03-17 22:25:59 +00001193 root = NILFS_I(d_inode(sb->s_root))->i_root;
Ryusuke Konishif7545142011-03-09 11:05:08 +09001194 err = nilfs_attach_log_writer(sb, root);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001195 if (err)
Ryusuke Konishie59399d2009-06-08 01:39:32 +09001196 goto restore_opts;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001197
1198 down_write(&nilfs->ns_sem);
Ryusuke Konishif7545142011-03-09 11:05:08 +09001199 nilfs_setup_super(sb, true);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001200 up_write(&nilfs->ns_sem);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001201 }
1202 out:
1203 return 0;
1204
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001205 restore_opts:
1206 sb->s_flags = old_sb_flags;
Ryusuke Konishi3b2ce582011-03-09 11:05:07 +09001207 nilfs->ns_mount_opt = old_mount_opt;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001208 return err;
1209}
1210
1211struct nilfs_super_data {
1212 struct block_device *bdev;
1213 __u64 cno;
1214 int flags;
1215};
1216
1217/**
1218 * nilfs_identify - pre-read mount options needed to identify mount instance
1219 * @data: mount options
1220 * @sd: nilfs_super_data
1221 */
1222static int nilfs_identify(char *data, struct nilfs_super_data *sd)
1223{
1224 char *p, *options = data;
1225 substring_t args[MAX_OPT_ARGS];
Ryusuke Konishic05dbfc2010-09-16 00:36:24 +09001226 int token;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001227 int ret = 0;
1228
1229 do {
1230 p = strsep(&options, ",");
1231 if (p != NULL && *p) {
1232 token = match_token(p, tokens, args);
1233 if (token == Opt_snapshot) {
Ryusuke Konishic05dbfc2010-09-16 00:36:24 +09001234 if (!(sd->flags & MS_RDONLY)) {
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001235 ret++;
Ryusuke Konishic05dbfc2010-09-16 00:36:24 +09001236 } else {
1237 sd->cno = simple_strtoull(args[0].from,
1238 NULL, 0);
1239 /*
1240 * No need to see the end pointer;
1241 * match_token() has done syntax
1242 * checking.
1243 */
1244 if (sd->cno == 0)
1245 ret++;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001246 }
1247 }
1248 if (ret)
1249 printk(KERN_ERR
1250 "NILFS: invalid mount option: %s\n", p);
1251 }
1252 if (!options)
1253 break;
1254 BUG_ON(options == data);
1255 *(options - 1) = ',';
1256 } while (!ret);
1257 return ret;
1258}
1259
1260static int nilfs_set_bdev_super(struct super_block *s, void *data)
1261{
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001262 s->s_bdev = data;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001263 s->s_dev = s->s_bdev->bd_dev;
1264 return 0;
1265}
1266
1267static int nilfs_test_bdev_super(struct super_block *s, void *data)
1268{
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001269 return (void *)s->s_bdev == data;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001270}
1271
Al Viroe4c59d62010-07-26 12:19:34 +04001272static struct dentry *
1273nilfs_mount(struct file_system_type *fs_type, int flags,
1274 const char *dev_name, void *data)
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001275{
1276 struct nilfs_super_data sd;
Ryusuke Konishi33c8e572009-06-08 01:39:29 +09001277 struct super_block *s;
Tejun Heod4d77622010-11-13 11:55:18 +01001278 fmode_t mode = FMODE_READ | FMODE_EXCL;
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001279 struct dentry *root_dentry;
1280 int err, s_new = false;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001281
Ryusuke Konishi13e90552010-05-09 02:57:57 +09001282 if (!(flags & MS_RDONLY))
1283 mode |= FMODE_WRITE;
1284
Tejun Heod4d77622010-11-13 11:55:18 +01001285 sd.bdev = blkdev_get_by_path(dev_name, mode, fs_type);
Jan Blunckd6d4c192010-02-24 13:25:32 +01001286 if (IS_ERR(sd.bdev))
Al Viroe4c59d62010-07-26 12:19:34 +04001287 return ERR_CAST(sd.bdev);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001288
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001289 sd.cno = 0;
1290 sd.flags = flags;
1291 if (nilfs_identify((char *)data, &sd)) {
1292 err = -EINVAL;
1293 goto failed;
1294 }
1295
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +09001296 /*
1297 * once the super is inserted into the list by sget, s_umount
1298 * will protect the lockfs code from trying to start a snapshot
1299 * while we are mounting
1300 */
1301 mutex_lock(&sd.bdev->bd_fsfreeze_mutex);
1302 if (sd.bdev->bd_fsfreeze_count > 0) {
1303 mutex_unlock(&sd.bdev->bd_fsfreeze_mutex);
1304 err = -EBUSY;
Ryusuke Konishi33c8e572009-06-08 01:39:29 +09001305 goto failed;
1306 }
David Howells9249e172012-06-25 12:55:37 +01001307 s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, flags,
1308 sd.bdev);
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +09001309 mutex_unlock(&sd.bdev->bd_fsfreeze_mutex);
Ryusuke Konishi33c8e572009-06-08 01:39:29 +09001310 if (IS_ERR(s)) {
1311 err = PTR_ERR(s);
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001312 goto failed;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001313 }
1314
1315 if (!s->s_root) {
1316 char b[BDEVNAME_SIZE];
1317
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001318 s_new = true;
1319
Ryusuke Konishi33c8e572009-06-08 01:39:29 +09001320 /* New superblock instance created */
Ryusuke Konishi4571b822010-05-09 03:01:32 +09001321 s->s_mode = mode;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001322 strlcpy(s->s_id, bdevname(sd.bdev, b), sizeof(s->s_id));
1323 sb_set_blocksize(s, block_size(sd.bdev));
1324
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001325 err = nilfs_fill_super(s, data, flags & MS_SILENT ? 1 : 0);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001326 if (err)
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001327 goto failed_super;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001328
1329 s->s_flags |= MS_ACTIVE;
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001330 } else if (!sd.cno) {
Al Viroe95c3112013-08-24 12:06:16 -04001331 if (nilfs_tree_is_busy(s->s_root)) {
1332 if ((flags ^ s->s_flags) & MS_RDONLY) {
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001333 printk(KERN_ERR "NILFS: the device already "
1334 "has a %s mount.\n",
1335 (s->s_flags & MS_RDONLY) ?
1336 "read-only" : "read/write");
1337 err = -EBUSY;
1338 goto failed_super;
1339 }
Al Viroe95c3112013-08-24 12:06:16 -04001340 } else {
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001341 /*
1342 * Try remount to setup mount states if the current
1343 * tree is not mounted and only snapshots use this sb.
1344 */
1345 err = nilfs_remount(s, &flags, data);
1346 if (err)
1347 goto failed_super;
1348 }
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001349 }
1350
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001351 if (sd.cno) {
1352 err = nilfs_attach_snapshot(s, sd.cno, &root_dentry);
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001353 if (err)
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001354 goto failed_super;
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001355 } else {
1356 root_dentry = dget(s->s_root);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001357 }
1358
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001359 if (!s_new)
Tejun Heod4d77622010-11-13 11:55:18 +01001360 blkdev_put(sd.bdev, mode);
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001361
Al Viroe4c59d62010-07-26 12:19:34 +04001362 return root_dentry;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001363
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001364 failed_super:
Al Viroa95161a2009-08-09 00:52:02 +04001365 deactivate_locked_super(s);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001366
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001367 failed:
1368 if (!s_new)
Tejun Heod4d77622010-11-13 11:55:18 +01001369 blkdev_put(sd.bdev, mode);
Al Viroe4c59d62010-07-26 12:19:34 +04001370 return ERR_PTR(err);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001371}
1372
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001373struct file_system_type nilfs_fs_type = {
1374 .owner = THIS_MODULE,
1375 .name = "nilfs2",
Al Viroe4c59d62010-07-26 12:19:34 +04001376 .mount = nilfs_mount,
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001377 .kill_sb = kill_block_super,
1378 .fs_flags = FS_REQUIRES_DEV,
1379};
Eric W. Biederman7f78e032013-03-02 19:39:14 -08001380MODULE_ALIAS_FS("nilfs2");
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001381
Li Hong41c88bd2010-04-06 00:54:11 +08001382static void nilfs_inode_init_once(void *obj)
1383{
1384 struct nilfs_inode_info *ii = obj;
1385
1386 INIT_LIST_HEAD(&ii->i_dirty);
1387#ifdef CONFIG_NILFS_XATTR
1388 init_rwsem(&ii->xattr_sem);
1389#endif
Miklos Szeredi2aa15892011-02-23 13:49:47 +01001390 address_space_init_once(&ii->i_btnode_cache);
Ryusuke Konishi05d0e942010-07-10 20:52:09 +09001391 ii->i_bmap = &ii->i_bmap_data;
Li Hong41c88bd2010-04-06 00:54:11 +08001392 inode_init_once(&ii->vfs_inode);
1393}
1394
1395static void nilfs_segbuf_init_once(void *obj)
1396{
1397 memset(obj, 0, sizeof(struct nilfs_segment_buffer));
1398}
1399
1400static void nilfs_destroy_cachep(void)
1401{
Kirill A. Shutemov8c0a8532012-09-26 11:33:07 +10001402 /*
1403 * Make sure all delayed rcu free inodes are flushed before we
1404 * destroy cache.
1405 */
1406 rcu_barrier();
1407
Ryusuke Konishi84cb0992010-05-22 12:49:32 +09001408 if (nilfs_inode_cachep)
Li Hong41c88bd2010-04-06 00:54:11 +08001409 kmem_cache_destroy(nilfs_inode_cachep);
Ryusuke Konishi84cb0992010-05-22 12:49:32 +09001410 if (nilfs_transaction_cachep)
Li Hong41c88bd2010-04-06 00:54:11 +08001411 kmem_cache_destroy(nilfs_transaction_cachep);
Ryusuke Konishi84cb0992010-05-22 12:49:32 +09001412 if (nilfs_segbuf_cachep)
Li Hong41c88bd2010-04-06 00:54:11 +08001413 kmem_cache_destroy(nilfs_segbuf_cachep);
Ryusuke Konishi84cb0992010-05-22 12:49:32 +09001414 if (nilfs_btree_path_cache)
Li Hong41c88bd2010-04-06 00:54:11 +08001415 kmem_cache_destroy(nilfs_btree_path_cache);
1416}
1417
1418static int __init nilfs_init_cachep(void)
1419{
1420 nilfs_inode_cachep = kmem_cache_create("nilfs2_inode_cache",
1421 sizeof(struct nilfs_inode_info), 0,
1422 SLAB_RECLAIM_ACCOUNT, nilfs_inode_init_once);
1423 if (!nilfs_inode_cachep)
1424 goto fail;
1425
1426 nilfs_transaction_cachep = kmem_cache_create("nilfs2_transaction_cache",
1427 sizeof(struct nilfs_transaction_info), 0,
1428 SLAB_RECLAIM_ACCOUNT, NULL);
1429 if (!nilfs_transaction_cachep)
1430 goto fail;
1431
1432 nilfs_segbuf_cachep = kmem_cache_create("nilfs2_segbuf_cache",
1433 sizeof(struct nilfs_segment_buffer), 0,
1434 SLAB_RECLAIM_ACCOUNT, nilfs_segbuf_init_once);
1435 if (!nilfs_segbuf_cachep)
1436 goto fail;
1437
1438 nilfs_btree_path_cache = kmem_cache_create("nilfs2_btree_path_cache",
1439 sizeof(struct nilfs_btree_path) * NILFS_BTREE_LEVEL_MAX,
1440 0, 0, NULL);
1441 if (!nilfs_btree_path_cache)
1442 goto fail;
1443
1444 return 0;
1445
1446fail:
1447 nilfs_destroy_cachep();
1448 return -ENOMEM;
1449}
1450
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001451static int __init init_nilfs_fs(void)
1452{
1453 int err;
1454
Li Hong41c88bd2010-04-06 00:54:11 +08001455 err = nilfs_init_cachep();
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001456 if (err)
Li Hong41c88bd2010-04-06 00:54:11 +08001457 goto fail;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001458
Vyacheslav Dubeykodd70edb2014-08-08 14:20:55 -07001459 err = nilfs_sysfs_init();
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001460 if (err)
Li Hong41c88bd2010-04-06 00:54:11 +08001461 goto free_cachep;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001462
Vyacheslav Dubeykodd70edb2014-08-08 14:20:55 -07001463 err = register_filesystem(&nilfs_fs_type);
1464 if (err)
1465 goto deinit_sysfs_entry;
1466
Li Hong9f130262010-04-09 23:09:53 +08001467 printk(KERN_INFO "NILFS version 2 loaded\n");
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001468 return 0;
1469
Vyacheslav Dubeykodd70edb2014-08-08 14:20:55 -07001470deinit_sysfs_entry:
1471 nilfs_sysfs_exit();
Li Hong41c88bd2010-04-06 00:54:11 +08001472free_cachep:
1473 nilfs_destroy_cachep();
1474fail:
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001475 return err;
1476}
1477
1478static void __exit exit_nilfs_fs(void)
1479{
Li Hong41c88bd2010-04-06 00:54:11 +08001480 nilfs_destroy_cachep();
Vyacheslav Dubeykodd70edb2014-08-08 14:20:55 -07001481 nilfs_sysfs_exit();
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)