blob: f804d41ec9d3b2e253972beed4ecda1fc2daf2b9 [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>
46#include <linux/random.h>
47#include <linux/crc32.h>
Ryusuke Konishi783f6182009-04-06 19:01:35 -070048#include <linux/vfs.h>
49#include <linux/writeback.h>
50#include <linux/kobject.h>
Jiro SEKIBAb58a2852009-06-24 20:06:34 +090051#include <linux/seq_file.h>
52#include <linux/mount.h>
Ryusuke Konishi783f6182009-04-06 19:01:35 -070053#include "nilfs.h"
Ryusuke Konishi8e656fd2010-08-27 00:23:02 +090054#include "export.h"
Ryusuke Konishi783f6182009-04-06 19:01:35 -070055#include "mdt.h"
56#include "alloc.h"
Ryusuke Konishi05d0e942010-07-10 20:52:09 +090057#include "btree.h"
58#include "btnode.h"
Ryusuke Konishi783f6182009-04-06 19:01:35 -070059#include "page.h"
60#include "cpfile.h"
61#include "ifile.h"
62#include "dat.h"
63#include "segment.h"
64#include "segbuf.h"
65
66MODULE_AUTHOR("NTT Corp.");
67MODULE_DESCRIPTION("A New Implementation of the Log-structured Filesystem "
68 "(NILFS)");
Ryusuke Konishi783f6182009-04-06 19:01:35 -070069MODULE_LICENSE("GPL");
70
Jiro SEKIBAabc0b502010-10-08 22:37:27 +090071static struct kmem_cache *nilfs_inode_cachep;
Li Hong41c88bd2010-04-06 00:54:11 +080072struct kmem_cache *nilfs_transaction_cachep;
73struct kmem_cache *nilfs_segbuf_cachep;
74struct kmem_cache *nilfs_btree_path_cache;
75
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +090076static int nilfs_setup_super(struct nilfs_sb_info *sbi, int is_mount);
Ryusuke Konishi783f6182009-04-06 19:01:35 -070077static int nilfs_remount(struct super_block *sb, int *flags, char *data);
Ryusuke Konishi783f6182009-04-06 19:01:35 -070078
Ryusuke Konishic8a11c82010-06-28 17:49:30 +090079static void nilfs_set_error(struct nilfs_sb_info *sbi)
80{
81 struct the_nilfs *nilfs = sbi->s_nilfs;
Jiro SEKIBAd26493b2010-06-28 17:49:32 +090082 struct nilfs_super_block **sbp;
Ryusuke Konishic8a11c82010-06-28 17:49:30 +090083
84 down_write(&nilfs->ns_sem);
85 if (!(nilfs->ns_mount_state & NILFS_ERROR_FS)) {
86 nilfs->ns_mount_state |= NILFS_ERROR_FS;
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +090087 sbp = nilfs_prepare_super(sbi, 0);
Jiro SEKIBAd26493b2010-06-28 17:49:32 +090088 if (likely(sbp)) {
89 sbp[0]->s_state |= cpu_to_le16(NILFS_ERROR_FS);
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +090090 if (sbp[1])
91 sbp[1]->s_state |= cpu_to_le16(NILFS_ERROR_FS);
92 nilfs_commit_super(sbi, NILFS_SB_COMMIT_ALL);
Jiro SEKIBAd26493b2010-06-28 17:49:32 +090093 }
Ryusuke Konishic8a11c82010-06-28 17:49:30 +090094 }
95 up_write(&nilfs->ns_sem);
96}
97
Ryusuke Konishi783f6182009-04-06 19:01:35 -070098/**
99 * nilfs_error() - report failure condition on a filesystem
100 *
101 * nilfs_error() sets an ERROR_FS flag on the superblock as well as
102 * reporting an error message. It should be called when NILFS detects
103 * incoherences or defects of meta data on disk. As for sustainable
104 * errors such as a single-shot I/O error, nilfs_warning() or the printk()
105 * function should be used instead.
106 *
107 * The segment constructor must not call this function because it can
108 * kill itself.
109 */
110void nilfs_error(struct super_block *sb, const char *function,
111 const char *fmt, ...)
112{
113 struct nilfs_sb_info *sbi = NILFS_SB(sb);
114 va_list args;
115
116 va_start(args, fmt);
117 printk(KERN_CRIT "NILFS error (device %s): %s: ", sb->s_id, function);
118 vprintk(fmt, args);
119 printk("\n");
120 va_end(args);
121
122 if (!(sb->s_flags & MS_RDONLY)) {
Ryusuke Konishic8a11c82010-06-28 17:49:30 +0900123 nilfs_set_error(sbi);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700124
125 if (nilfs_test_opt(sbi, ERRORS_RO)) {
126 printk(KERN_CRIT "Remounting filesystem read-only\n");
127 sb->s_flags |= MS_RDONLY;
128 }
129 }
130
131 if (nilfs_test_opt(sbi, ERRORS_PANIC))
132 panic("NILFS (device %s): panic forced after error\n",
133 sb->s_id);
134}
135
136void nilfs_warning(struct super_block *sb, const char *function,
137 const char *fmt, ...)
138{
139 va_list args;
140
141 va_start(args, fmt);
142 printk(KERN_WARNING "NILFS warning (device %s): %s: ",
143 sb->s_id, function);
144 vprintk(fmt, args);
145 printk("\n");
146 va_end(args);
147}
148
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700149
Ryusuke Konishi2879ed62010-09-05 13:35:53 +0900150struct inode *nilfs_alloc_inode(struct super_block *sb)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700151{
152 struct nilfs_inode_info *ii;
153
154 ii = kmem_cache_alloc(nilfs_inode_cachep, GFP_NOFS);
155 if (!ii)
156 return NULL;
157 ii->i_bh = NULL;
158 ii->i_state = 0;
Ryusuke Konishi0e14a352010-08-20 21:20:29 +0900159 ii->i_cno = 0;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700160 ii->vfs_inode.i_version = 1;
Ryusuke Konishi2879ed62010-09-05 13:35:53 +0900161 nilfs_btnode_cache_init(&ii->i_btnode_cache, sb->s_bdi);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700162 return &ii->vfs_inode;
163}
164
165void nilfs_destroy_inode(struct inode *inode)
166{
Ryusuke Konishib91c9a92010-08-20 23:46:06 +0900167 struct nilfs_mdt_info *mdi = NILFS_MDT(inode);
168
169 if (mdi) {
170 kfree(mdi->mi_bgl); /* kfree(NULL) is safe */
171 kfree(mdi);
172 }
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700173 kmem_cache_free(nilfs_inode_cachep, NILFS_I(inode));
174}
175
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900176static int nilfs_sync_super(struct nilfs_sb_info *sbi, int flag)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700177{
178 struct the_nilfs *nilfs = sbi->s_nilfs;
179 int err;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700180
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700181 retry:
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700182 set_buffer_dirty(nilfs->ns_sbh[0]);
Christoph Hellwig87e99512010-08-11 17:05:45 +0200183 if (nilfs_test_opt(sbi, BARRIER)) {
184 err = __sync_dirty_buffer(nilfs->ns_sbh[0],
Christoph Hellwigf8c131f2010-08-18 05:29:15 -0400185 WRITE_SYNC | WRITE_FLUSH_FUA);
Christoph Hellwig87e99512010-08-11 17:05:45 +0200186 } else {
187 err = sync_dirty_buffer(nilfs->ns_sbh[0]);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700188 }
Christoph Hellwig87e99512010-08-11 17:05:45 +0200189
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700190 if (unlikely(err)) {
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700191 printk(KERN_ERR
192 "NILFS: unable to write superblock (err=%d)\n", err);
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700193 if (err == -EIO && nilfs->ns_sbh[1]) {
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900194 /*
195 * sbp[0] points to newer log than sbp[1],
196 * so copy sbp[0] to sbp[1] to take over sbp[0].
197 */
198 memcpy(nilfs->ns_sbp[1], nilfs->ns_sbp[0],
199 nilfs->ns_sbsize);
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700200 nilfs_fall_back_super_block(nilfs);
201 goto retry;
202 }
203 } else {
204 struct nilfs_super_block *sbp = nilfs->ns_sbp[0];
205
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900206 nilfs->ns_sbwcount++;
207
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700208 /*
209 * The latest segment becomes trailable from the position
210 * written in superblock.
211 */
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700212 clear_nilfs_discontinued(nilfs);
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700213
214 /* update GC protection for recent segments */
215 if (nilfs->ns_sbh[1]) {
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900216 if (flag == NILFS_SB_COMMIT_ALL) {
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700217 set_buffer_dirty(nilfs->ns_sbh[1]);
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900218 if (sync_dirty_buffer(nilfs->ns_sbh[1]) < 0)
219 goto out;
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700220 }
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900221 if (le64_to_cpu(nilfs->ns_sbp[1]->s_last_cno) <
222 le64_to_cpu(nilfs->ns_sbp[0]->s_last_cno))
223 sbp = nilfs->ns_sbp[1];
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700224 }
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700225
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900226 spin_lock(&nilfs->ns_last_segment_lock);
227 nilfs->ns_prot_seq = le64_to_cpu(sbp->s_last_seq);
228 spin_unlock(&nilfs->ns_last_segment_lock);
229 }
230 out:
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700231 return err;
232}
233
Ryusuke Konishi60f46b72010-06-28 17:49:31 +0900234void nilfs_set_log_cursor(struct nilfs_super_block *sbp,
235 struct the_nilfs *nilfs)
236{
237 sector_t nfreeblocks;
238
239 /* nilfs->ns_sem must be locked by the caller. */
240 nilfs_count_free_blocks(nilfs, &nfreeblocks);
241 sbp->s_free_blocks_count = cpu_to_le64(nfreeblocks);
242
243 spin_lock(&nilfs->ns_last_segment_lock);
244 sbp->s_last_seq = cpu_to_le64(nilfs->ns_last_seq);
245 sbp->s_last_pseg = cpu_to_le64(nilfs->ns_last_pseg);
246 sbp->s_last_cno = cpu_to_le64(nilfs->ns_last_cno);
247 spin_unlock(&nilfs->ns_last_segment_lock);
248}
249
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900250struct nilfs_super_block **nilfs_prepare_super(struct nilfs_sb_info *sbi,
251 int flip)
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900252{
253 struct the_nilfs *nilfs = sbi->s_nilfs;
254 struct nilfs_super_block **sbp = nilfs->ns_sbp;
255
256 /* nilfs->ns_sem must be locked by the caller. */
257 if (sbp[0]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) {
258 if (sbp[1] &&
259 sbp[1]->s_magic == cpu_to_le16(NILFS_SUPER_MAGIC)) {
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900260 memcpy(sbp[0], sbp[1], nilfs->ns_sbsize);
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900261 } else {
262 printk(KERN_CRIT "NILFS: superblock broke on dev %s\n",
263 sbi->s_super->s_id);
264 return NULL;
265 }
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900266 } else if (sbp[1] &&
267 sbp[1]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) {
268 memcpy(sbp[1], sbp[0], nilfs->ns_sbsize);
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900269 }
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900270
271 if (flip && sbp[1])
272 nilfs_swap_super_block(nilfs);
273
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900274 return sbp;
275}
276
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900277int nilfs_commit_super(struct nilfs_sb_info *sbi, int flag)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700278{
279 struct the_nilfs *nilfs = sbi->s_nilfs;
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700280 struct nilfs_super_block **sbp = nilfs->ns_sbp;
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700281 time_t t;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700282
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900283 /* nilfs->ns_sem must be locked by the caller. */
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700284 t = get_seconds();
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900285 nilfs->ns_sbwtime = t;
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700286 sbp[0]->s_wtime = cpu_to_le64(t);
287 sbp[0]->s_sum = 0;
288 sbp[0]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed,
289 (unsigned char *)sbp[0],
290 nilfs->ns_sbsize));
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900291 if (flag == NILFS_SB_COMMIT_ALL && sbp[1]) {
292 sbp[1]->s_wtime = sbp[0]->s_wtime;
293 sbp[1]->s_sum = 0;
294 sbp[1]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed,
295 (unsigned char *)sbp[1],
296 nilfs->ns_sbsize));
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700297 }
Ryusuke Konishie605f0a2009-12-09 00:57:52 +0900298 clear_nilfs_sb_dirty(nilfs);
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900299 return nilfs_sync_super(sbi, flag);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700300}
301
Ryusuke Konishi7ecaa462010-06-28 17:49:29 +0900302/**
303 * nilfs_cleanup_super() - write filesystem state for cleanup
304 * @sbi: nilfs_sb_info to be unmounted or degraded to read-only
305 *
306 * This function restores state flags in the on-disk super block.
307 * This will set "clean" flag (i.e. NILFS_VALID_FS) unless the
308 * filesystem was not clean previously.
309 */
310int nilfs_cleanup_super(struct nilfs_sb_info *sbi)
311{
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900312 struct nilfs_super_block **sbp;
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900313 int flag = NILFS_SB_COMMIT;
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900314 int ret = -EIO;
Ryusuke Konishi7ecaa462010-06-28 17:49:29 +0900315
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900316 sbp = nilfs_prepare_super(sbi, 0);
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900317 if (sbp) {
318 sbp[0]->s_state = cpu_to_le16(sbi->s_nilfs->ns_mount_state);
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900319 nilfs_set_log_cursor(sbp[0], sbi->s_nilfs);
320 if (sbp[1] && sbp[0]->s_last_cno == sbp[1]->s_last_cno) {
321 /*
322 * make the "clean" flag also to the opposite
323 * super block if both super blocks point to
324 * the same checkpoint.
325 */
326 sbp[1]->s_state = sbp[0]->s_state;
327 flag = NILFS_SB_COMMIT_ALL;
328 }
329 ret = nilfs_commit_super(sbi, flag);
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900330 }
Ryusuke Konishi7ecaa462010-06-28 17:49:29 +0900331 return ret;
332}
333
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700334static void nilfs_put_super(struct super_block *sb)
335{
336 struct nilfs_sb_info *sbi = NILFS_SB(sb);
337 struct the_nilfs *nilfs = sbi->s_nilfs;
338
339 nilfs_detach_segment_constructor(sbi);
340
341 if (!(sb->s_flags & MS_RDONLY)) {
342 down_write(&nilfs->ns_sem);
Ryusuke Konishi7ecaa462010-06-28 17:49:29 +0900343 nilfs_cleanup_super(sbi);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700344 up_write(&nilfs->ns_sem);
345 }
346
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900347 iput(nilfs->ns_sufile);
348 iput(nilfs->ns_cpfile);
349 iput(nilfs->ns_dat);
350
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +0900351 destroy_nilfs(nilfs);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700352 sbi->s_super = NULL;
353 sb->s_fs_info = NULL;
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900354 kfree(sbi);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700355}
356
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700357static int nilfs_sync_fs(struct super_block *sb, int wait)
358{
Jiro SEKIBA6233caa2009-07-23 01:26:33 +0900359 struct nilfs_sb_info *sbi = NILFS_SB(sb);
360 struct the_nilfs *nilfs = sbi->s_nilfs;
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900361 struct nilfs_super_block **sbp;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700362 int err = 0;
363
364 /* This function is called when super block should be written back */
365 if (wait)
366 err = nilfs_construct_segment(sb);
Jiro SEKIBA6233caa2009-07-23 01:26:33 +0900367
368 down_write(&nilfs->ns_sem);
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900369 if (nilfs_sb_dirty(nilfs)) {
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900370 sbp = nilfs_prepare_super(sbi, nilfs_sb_will_flip(nilfs));
371 if (likely(sbp)) {
372 nilfs_set_log_cursor(sbp[0], nilfs);
373 nilfs_commit_super(sbi, NILFS_SB_COMMIT);
374 }
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900375 }
Jiro SEKIBA6233caa2009-07-23 01:26:33 +0900376 up_write(&nilfs->ns_sem);
377
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700378 return err;
379}
380
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900381int nilfs_attach_checkpoint(struct nilfs_sb_info *sbi, __u64 cno, int curr_mnt,
382 struct nilfs_root **rootp)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700383{
384 struct the_nilfs *nilfs = sbi->s_nilfs;
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900385 struct nilfs_root *root;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700386 struct nilfs_checkpoint *raw_cp;
387 struct buffer_head *bh_cp;
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900388 int err = -ENOMEM;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700389
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900390 root = nilfs_find_or_create_root(
391 nilfs, curr_mnt ? NILFS_CPTREE_CURRENT_CNO : cno);
392 if (!root)
393 return err;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700394
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900395 if (root->ifile)
396 goto reuse; /* already attached checkpoint */
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700397
Zhang Qiang1154ecb2009-08-18 14:58:24 +0800398 down_read(&nilfs->ns_segctor_sem);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700399 err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, cno, 0, &raw_cp,
400 &bh_cp);
Zhang Qiang1154ecb2009-08-18 14:58:24 +0800401 up_read(&nilfs->ns_segctor_sem);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700402 if (unlikely(err)) {
403 if (err == -ENOENT || err == -EINVAL) {
404 printk(KERN_ERR
405 "NILFS: Invalid checkpoint "
406 "(checkpoint number=%llu)\n",
407 (unsigned long long)cno);
408 err = -EINVAL;
409 }
410 goto failed;
411 }
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900412
413 err = nilfs_ifile_read(sbi->s_super, root, nilfs->ns_inode_size,
414 &raw_cp->cp_ifile_inode, &root->ifile);
415 if (err)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700416 goto failed_bh;
Ryusuke Konishib7c06342010-08-14 14:48:32 +0900417
418 atomic_set(&root->inodes_count, le64_to_cpu(raw_cp->cp_inodes_count));
419 atomic_set(&root->blocks_count, le64_to_cpu(raw_cp->cp_blocks_count));
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700420
421 nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp);
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900422
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900423 reuse:
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900424 *rootp = root;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700425 return 0;
426
427 failed_bh:
428 nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp);
429 failed:
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900430 nilfs_put_root(root);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700431
432 return err;
433}
434
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900435static int nilfs_freeze(struct super_block *sb)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700436{
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900437 struct nilfs_sb_info *sbi = NILFS_SB(sb);
438 struct the_nilfs *nilfs = sbi->s_nilfs;
439 int err;
440
441 if (sb->s_flags & MS_RDONLY)
442 return 0;
443
444 /* Mark super block clean */
445 down_write(&nilfs->ns_sem);
446 err = nilfs_cleanup_super(sbi);
447 up_write(&nilfs->ns_sem);
448 return err;
449}
450
451static int nilfs_unfreeze(struct super_block *sb)
452{
453 struct nilfs_sb_info *sbi = NILFS_SB(sb);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700454 struct the_nilfs *nilfs = sbi->s_nilfs;
455
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900456 if (sb->s_flags & MS_RDONLY)
457 return 0;
458
459 down_write(&nilfs->ns_sem);
460 nilfs_setup_super(sbi, false);
461 up_write(&nilfs->ns_sem);
462 return 0;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700463}
464
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700465static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf)
466{
467 struct super_block *sb = dentry->d_sb;
Ryusuke Konishib7c06342010-08-14 14:48:32 +0900468 struct nilfs_root *root = NILFS_I(dentry->d_inode)->i_root;
469 struct the_nilfs *nilfs = root->nilfs;
Ryusuke Konishic306af22009-03-26 10:16:57 +0900470 u64 id = huge_encode_dev(sb->s_bdev->bd_dev);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700471 unsigned long long blocks;
472 unsigned long overhead;
473 unsigned long nrsvblocks;
474 sector_t nfreeblocks;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700475 int err;
476
477 /*
478 * Compute all of the segment blocks
479 *
480 * The blocks before first segment and after last segment
481 * are excluded.
482 */
483 blocks = nilfs->ns_blocks_per_segment * nilfs->ns_nsegments
484 - nilfs->ns_first_data_block;
485 nrsvblocks = nilfs->ns_nrsvsegs * nilfs->ns_blocks_per_segment;
486
487 /*
488 * Compute the overhead
489 *
Ryusuke Konishi7a650042010-03-14 03:32:40 +0900490 * When distributing meta data blocks outside segment structure,
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700491 * We must count them as the overhead.
492 */
493 overhead = 0;
494
495 err = nilfs_count_free_blocks(nilfs, &nfreeblocks);
496 if (unlikely(err))
497 return err;
498
499 buf->f_type = NILFS_SUPER_MAGIC;
500 buf->f_bsize = sb->s_blocksize;
501 buf->f_blocks = blocks - overhead;
502 buf->f_bfree = nfreeblocks;
503 buf->f_bavail = (buf->f_bfree >= nrsvblocks) ?
504 (buf->f_bfree - nrsvblocks) : 0;
Ryusuke Konishib7c06342010-08-14 14:48:32 +0900505 buf->f_files = atomic_read(&root->inodes_count);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700506 buf->f_ffree = 0; /* nilfs_count_free_inodes(sb); */
507 buf->f_namelen = NILFS_NAME_LEN;
Ryusuke Konishic306af22009-03-26 10:16:57 +0900508 buf->f_fsid.val[0] = (u32)id;
509 buf->f_fsid.val[1] = (u32)(id >> 32);
510
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700511 return 0;
512}
513
Jiro SEKIBAb58a2852009-06-24 20:06:34 +0900514static int nilfs_show_options(struct seq_file *seq, struct vfsmount *vfs)
515{
516 struct super_block *sb = vfs->mnt_sb;
517 struct nilfs_sb_info *sbi = NILFS_SB(sb);
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900518 struct nilfs_root *root = NILFS_I(vfs->mnt_root->d_inode)->i_root;
Jiro SEKIBAb58a2852009-06-24 20:06:34 +0900519
520 if (!nilfs_test_opt(sbi, BARRIER))
Ryusuke Konishic6b4d572010-07-05 14:40:27 +0900521 seq_puts(seq, ",nobarrier");
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900522 if (root->cno != NILFS_CPTREE_CURRENT_CNO)
523 seq_printf(seq, ",cp=%llu", (unsigned long long)root->cno);
Jiro SEKIBAb58a2852009-06-24 20:06:34 +0900524 if (nilfs_test_opt(sbi, ERRORS_PANIC))
Ryusuke Konishic6b4d572010-07-05 14:40:27 +0900525 seq_puts(seq, ",errors=panic");
Ryusuke Konishi277a6a32010-04-02 18:02:33 +0900526 if (nilfs_test_opt(sbi, ERRORS_CONT))
Ryusuke Konishic6b4d572010-07-05 14:40:27 +0900527 seq_puts(seq, ",errors=continue");
Jiro SEKIBAb58a2852009-06-24 20:06:34 +0900528 if (nilfs_test_opt(sbi, STRICT_ORDER))
Ryusuke Konishic6b4d572010-07-05 14:40:27 +0900529 seq_puts(seq, ",order=strict");
Ryusuke Konishi02345762009-11-20 03:28:01 +0900530 if (nilfs_test_opt(sbi, NORECOVERY))
Ryusuke Konishic6b4d572010-07-05 14:40:27 +0900531 seq_puts(seq, ",norecovery");
Jiro SEKIBAe902ec92010-01-30 18:06:35 +0900532 if (nilfs_test_opt(sbi, DISCARD))
Ryusuke Konishic6b4d572010-07-05 14:40:27 +0900533 seq_puts(seq, ",discard");
Jiro SEKIBAb58a2852009-06-24 20:06:34 +0900534
535 return 0;
536}
537
Alexey Dobriyanb87221d2009-09-21 17:01:09 -0700538static const struct super_operations nilfs_sops = {
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700539 .alloc_inode = nilfs_alloc_inode,
540 .destroy_inode = nilfs_destroy_inode,
541 .dirty_inode = nilfs_dirty_inode,
542 /* .write_inode = nilfs_write_inode, */
543 /* .put_inode = nilfs_put_inode, */
544 /* .drop_inode = nilfs_drop_inode, */
Al Viro6fd1e5c2010-06-07 11:55:00 -0400545 .evict_inode = nilfs_evict_inode,
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700546 .put_super = nilfs_put_super,
Jiro SEKIBA1dfa2712009-07-23 01:33:49 +0900547 /* .write_super = nilfs_write_super, */
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700548 .sync_fs = nilfs_sync_fs,
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900549 .freeze_fs = nilfs_freeze,
550 .unfreeze_fs = nilfs_unfreeze,
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700551 /* .write_super_lockfs */
552 /* .unlockfs */
553 .statfs = nilfs_statfs,
554 .remount_fs = nilfs_remount,
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700555 /* .umount_begin */
Jiro SEKIBAb58a2852009-06-24 20:06:34 +0900556 .show_options = nilfs_show_options
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700557};
558
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700559enum {
560 Opt_err_cont, Opt_err_panic, Opt_err_ro,
Ryusuke Konishi773bc4f2010-07-05 13:00:08 +0900561 Opt_barrier, Opt_nobarrier, Opt_snapshot, Opt_order, Opt_norecovery,
Ryusuke Konishi802d3172010-07-05 14:27:04 +0900562 Opt_discard, Opt_nodiscard, Opt_err,
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700563};
564
565static match_table_t tokens = {
566 {Opt_err_cont, "errors=continue"},
567 {Opt_err_panic, "errors=panic"},
568 {Opt_err_ro, "errors=remount-ro"},
Ryusuke Konishi773bc4f2010-07-05 13:00:08 +0900569 {Opt_barrier, "barrier"},
Jiro SEKIBA91f19532009-11-12 14:07:26 +0900570 {Opt_nobarrier, "nobarrier"},
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700571 {Opt_snapshot, "cp=%u"},
572 {Opt_order, "order=%s"},
Ryusuke Konishi02345762009-11-20 03:28:01 +0900573 {Opt_norecovery, "norecovery"},
Jiro SEKIBAe902ec92010-01-30 18:06:35 +0900574 {Opt_discard, "discard"},
Ryusuke Konishi802d3172010-07-05 14:27:04 +0900575 {Opt_nodiscard, "nodiscard"},
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700576 {Opt_err, NULL}
577};
578
Ryusuke Konishi7c017452010-07-05 20:08:33 +0900579static int parse_options(char *options, struct super_block *sb, int is_remount)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700580{
581 struct nilfs_sb_info *sbi = NILFS_SB(sb);
582 char *p;
583 substring_t args[MAX_OPT_ARGS];
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700584
585 if (!options)
586 return 1;
587
588 while ((p = strsep(&options, ",")) != NULL) {
589 int token;
590 if (!*p)
591 continue;
592
593 token = match_token(p, tokens, args);
594 switch (token) {
Ryusuke Konishi773bc4f2010-07-05 13:00:08 +0900595 case Opt_barrier:
596 nilfs_set_opt(sbi, BARRIER);
597 break;
Jiro SEKIBA91f19532009-11-12 14:07:26 +0900598 case Opt_nobarrier:
599 nilfs_clear_opt(sbi, BARRIER);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700600 break;
601 case Opt_order:
602 if (strcmp(args[0].from, "relaxed") == 0)
603 /* Ordered data semantics */
604 nilfs_clear_opt(sbi, STRICT_ORDER);
605 else if (strcmp(args[0].from, "strict") == 0)
606 /* Strict in-order semantics */
607 nilfs_set_opt(sbi, STRICT_ORDER);
608 else
609 return 0;
610 break;
611 case Opt_err_panic:
612 nilfs_write_opt(sbi, ERROR_MODE, ERRORS_PANIC);
613 break;
614 case Opt_err_ro:
615 nilfs_write_opt(sbi, ERROR_MODE, ERRORS_RO);
616 break;
617 case Opt_err_cont:
618 nilfs_write_opt(sbi, ERROR_MODE, ERRORS_CONT);
619 break;
620 case Opt_snapshot:
Ryusuke Konishi7c017452010-07-05 20:08:33 +0900621 if (is_remount) {
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900622 printk(KERN_ERR
623 "NILFS: \"%s\" option is invalid "
624 "for remount.\n", p);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700625 return 0;
Ryusuke Konishi7c017452010-07-05 20:08:33 +0900626 }
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700627 break;
Ryusuke Konishi02345762009-11-20 03:28:01 +0900628 case Opt_norecovery:
629 nilfs_set_opt(sbi, NORECOVERY);
630 break;
Jiro SEKIBAe902ec92010-01-30 18:06:35 +0900631 case Opt_discard:
632 nilfs_set_opt(sbi, DISCARD);
633 break;
Ryusuke Konishi802d3172010-07-05 14:27:04 +0900634 case Opt_nodiscard:
635 nilfs_clear_opt(sbi, DISCARD);
636 break;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700637 default:
638 printk(KERN_ERR
639 "NILFS: Unrecognized mount option \"%s\"\n", p);
640 return 0;
641 }
642 }
643 return 1;
644}
645
646static inline void
647nilfs_set_default_options(struct nilfs_sb_info *sbi,
648 struct nilfs_super_block *sbp)
649{
650 sbi->s_mount_opt =
Ryusuke Konishi277a6a32010-04-02 18:02:33 +0900651 NILFS_MOUNT_ERRORS_RO | NILFS_MOUNT_BARRIER;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700652}
653
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900654static int nilfs_setup_super(struct nilfs_sb_info *sbi, int is_mount)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700655{
656 struct the_nilfs *nilfs = sbi->s_nilfs;
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900657 struct nilfs_super_block **sbp;
658 int max_mnt_count;
659 int mnt_count;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700660
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900661 /* nilfs->ns_sem must be locked by the caller. */
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900662 sbp = nilfs_prepare_super(sbi, 0);
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900663 if (!sbp)
664 return -EIO;
665
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900666 if (!is_mount)
667 goto skip_mount_setup;
668
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900669 max_mnt_count = le16_to_cpu(sbp[0]->s_max_mnt_count);
670 mnt_count = le16_to_cpu(sbp[0]->s_mnt_count);
671
Ryusuke Konishif50a4c82009-11-19 16:58:40 +0900672 if (nilfs->ns_mount_state & NILFS_ERROR_FS) {
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700673 printk(KERN_WARNING
674 "NILFS warning: mounting fs with errors\n");
675#if 0
676 } else if (max_mnt_count >= 0 && mnt_count >= max_mnt_count) {
677 printk(KERN_WARNING
678 "NILFS warning: maximal mount count reached\n");
679#endif
680 }
681 if (!max_mnt_count)
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900682 sbp[0]->s_max_mnt_count = cpu_to_le16(NILFS_DFL_MAX_MNT_COUNT);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700683
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900684 sbp[0]->s_mnt_count = cpu_to_le16(mnt_count + 1);
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900685 sbp[0]->s_mtime = cpu_to_le64(get_seconds());
686
687skip_mount_setup:
Jiro SEKIBAd26493b2010-06-28 17:49:32 +0900688 sbp[0]->s_state =
689 cpu_to_le16(le16_to_cpu(sbp[0]->s_state) & ~NILFS_VALID_FS);
Jiro SEKIBAb2ac86e2010-06-28 17:49:33 +0900690 /* synchronize sbp[1] with sbp[0] */
691 memcpy(sbp[1], sbp[0], nilfs->ns_sbsize);
692 return nilfs_commit_super(sbi, NILFS_SB_COMMIT_ALL);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700693}
694
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700695struct nilfs_super_block *nilfs_read_super_block(struct super_block *sb,
696 u64 pos, int blocksize,
697 struct buffer_head **pbh)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700698{
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700699 unsigned long long sb_index = pos;
700 unsigned long offset;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700701
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700702 offset = do_div(sb_index, blocksize);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700703 *pbh = sb_bread(sb, sb_index);
Ryusuke Konishie339ad32009-04-06 19:01:59 -0700704 if (!*pbh)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700705 return NULL;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700706 return (struct nilfs_super_block *)((char *)(*pbh)->b_data + offset);
707}
708
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700709int nilfs_store_magic_and_option(struct super_block *sb,
710 struct nilfs_super_block *sbp,
711 char *data)
712{
713 struct nilfs_sb_info *sbi = NILFS_SB(sb);
714
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700715 sb->s_magic = le16_to_cpu(sbp->s_magic);
716
717 /* FS independent flags */
718#ifdef NILFS_ATIME_DISABLE
719 sb->s_flags |= MS_NOATIME;
720#endif
721
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700722 nilfs_set_default_options(sbi, sbp);
723
724 sbi->s_resuid = le16_to_cpu(sbp->s_def_resuid);
725 sbi->s_resgid = le16_to_cpu(sbp->s_def_resgid);
726 sbi->s_interval = le32_to_cpu(sbp->s_c_interval);
727 sbi->s_watermark = le32_to_cpu(sbp->s_c_block_max);
728
Ryusuke Konishi7c017452010-07-05 20:08:33 +0900729 return !parse_options(data, sb, 0) ? -EINVAL : 0 ;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700730}
731
Ryusuke Konishic5ca48a2010-07-22 03:22:20 +0900732int nilfs_check_feature_compatibility(struct super_block *sb,
733 struct nilfs_super_block *sbp)
734{
735 __u64 features;
736
737 features = le64_to_cpu(sbp->s_feature_incompat) &
738 ~NILFS_FEATURE_INCOMPAT_SUPP;
739 if (features) {
740 printk(KERN_ERR "NILFS: couldn't mount because of unsupported "
741 "optional features (%llx)\n",
742 (unsigned long long)features);
743 return -EINVAL;
744 }
745 features = le64_to_cpu(sbp->s_feature_compat_ro) &
746 ~NILFS_FEATURE_COMPAT_RO_SUPP;
747 if (!(sb->s_flags & MS_RDONLY) && features) {
748 printk(KERN_ERR "NILFS: couldn't mount RDWR because of "
749 "unsupported optional features (%llx)\n",
750 (unsigned long long)features);
751 return -EINVAL;
752 }
753 return 0;
754}
755
Ryusuke Konishi367ea332010-08-26 01:52:51 +0900756static int nilfs_get_root_dentry(struct super_block *sb,
757 struct nilfs_root *root,
758 struct dentry **root_dentry)
759{
760 struct inode *inode;
761 struct dentry *dentry;
762 int ret = 0;
763
764 inode = nilfs_iget(sb, root, NILFS_ROOT_INO);
765 if (IS_ERR(inode)) {
766 printk(KERN_ERR "NILFS: get root inode failed\n");
767 ret = PTR_ERR(inode);
768 goto out;
769 }
770 if (!S_ISDIR(inode->i_mode) || !inode->i_blocks || !inode->i_size) {
771 iput(inode);
772 printk(KERN_ERR "NILFS: corrupt root inode.\n");
773 ret = -EINVAL;
774 goto out;
775 }
776
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900777 if (root->cno == NILFS_CPTREE_CURRENT_CNO) {
778 dentry = d_find_alias(inode);
779 if (!dentry) {
780 dentry = d_alloc_root(inode);
781 if (!dentry) {
782 iput(inode);
783 ret = -ENOMEM;
784 goto failed_dentry;
785 }
786 } else {
787 iput(inode);
788 }
789 } else {
790 dentry = d_obtain_alias(inode);
791 if (IS_ERR(dentry)) {
792 ret = PTR_ERR(dentry);
793 goto failed_dentry;
794 }
Ryusuke Konishi367ea332010-08-26 01:52:51 +0900795 }
796 *root_dentry = dentry;
797 out:
798 return ret;
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900799
800 failed_dentry:
801 printk(KERN_ERR "NILFS: get root dentry failed\n");
802 goto out;
Ryusuke Konishi367ea332010-08-26 01:52:51 +0900803}
804
Ryusuke Konishiab4d8f72010-08-26 02:15:41 +0900805static int nilfs_attach_snapshot(struct super_block *s, __u64 cno,
806 struct dentry **root_dentry)
807{
808 struct the_nilfs *nilfs = NILFS_SB(s)->s_nilfs;
809 struct nilfs_root *root;
810 int ret;
811
812 down_read(&nilfs->ns_segctor_sem);
813 ret = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile, cno);
814 up_read(&nilfs->ns_segctor_sem);
815 if (ret < 0) {
816 ret = (ret == -ENOENT) ? -EINVAL : ret;
817 goto out;
818 } else if (!ret) {
819 printk(KERN_ERR "NILFS: The specified checkpoint is "
820 "not a snapshot (checkpoint number=%llu).\n",
821 (unsigned long long)cno);
822 ret = -EINVAL;
823 goto out;
824 }
825
826 ret = nilfs_attach_checkpoint(NILFS_SB(s), cno, false, &root);
827 if (ret) {
828 printk(KERN_ERR "NILFS: error loading snapshot "
829 "(checkpoint number=%llu).\n",
830 (unsigned long long)cno);
831 goto out;
832 }
833 ret = nilfs_get_root_dentry(s, root, root_dentry);
834 nilfs_put_root(root);
835 out:
836 return ret;
837}
838
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900839static int nilfs_tree_was_touched(struct dentry *root_dentry)
840{
841 return atomic_read(&root_dentry->d_count) > 1;
842}
843
844/**
845 * nilfs_try_to_shrink_tree() - try to shrink dentries of a checkpoint
846 * @root_dentry: root dentry of the tree to be shrunk
847 *
848 * This function returns true if the tree was in-use.
849 */
850static int nilfs_try_to_shrink_tree(struct dentry *root_dentry)
851{
852 if (have_submounts(root_dentry))
853 return true;
854 shrink_dcache_parent(root_dentry);
855 return nilfs_tree_was_touched(root_dentry);
856}
857
Ryusuke Konishi032dbb32010-09-13 11:16:34 +0900858int nilfs_checkpoint_is_mounted(struct super_block *sb, __u64 cno)
859{
860 struct the_nilfs *nilfs = NILFS_SB(sb)->s_nilfs;
861 struct nilfs_root *root;
862 struct inode *inode;
863 struct dentry *dentry;
864 int ret;
865
866 if (cno < 0 || cno > nilfs->ns_cno)
867 return false;
868
869 if (cno >= nilfs_last_cno(nilfs))
870 return true; /* protect recent checkpoints */
871
872 ret = false;
873 root = nilfs_lookup_root(NILFS_SB(sb)->s_nilfs, cno);
874 if (root) {
875 inode = nilfs_ilookup(sb, root, NILFS_ROOT_INO);
876 if (inode) {
877 dentry = d_find_alias(inode);
878 if (dentry) {
879 if (nilfs_tree_was_touched(dentry))
880 ret = nilfs_try_to_shrink_tree(dentry);
881 dput(dentry);
882 }
883 iput(inode);
884 }
885 nilfs_put_root(root);
886 }
887 return ret;
888}
889
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700890/**
891 * nilfs_fill_super() - initialize a super block instance
892 * @sb: super_block
893 * @data: mount options
894 * @silent: silent mode flag
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700895 *
Ryusuke Konishiaa7dfb82009-06-08 01:39:33 +0900896 * This function is called exclusively by nilfs->ns_mount_mutex.
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700897 * So, the recovery process is protected from other simultaneous mounts.
898 */
899static int
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +0900900nilfs_fill_super(struct super_block *sb, void *data, int silent)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700901{
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +0900902 struct the_nilfs *nilfs;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700903 struct nilfs_sb_info *sbi;
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900904 struct nilfs_root *fsroot;
Ryusuke Konishi026a7d62010-10-07 14:19:48 +0900905 struct backing_dev_info *bdi;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700906 __u64 cno;
907 int err;
908
909 sbi = kzalloc(sizeof(*sbi), GFP_KERNEL);
910 if (!sbi)
911 return -ENOMEM;
912
913 sb->s_fs_info = sbi;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700914 sbi->s_super = sb;
915
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +0900916 nilfs = alloc_nilfs(sb->s_bdev);
917 if (!nilfs) {
918 err = -ENOMEM;
919 goto failed_sbi;
920 }
921 sbi->s_nilfs = nilfs;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700922
923 err = init_nilfs(nilfs, sbi, (char *)data);
924 if (err)
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +0900925 goto failed_nilfs;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700926
927 spin_lock_init(&sbi->s_inode_lock);
928 INIT_LIST_HEAD(&sbi->s_dirty_files);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700929
930 /*
931 * Following initialization is overlapped because
932 * nilfs_sb_info structure has been cleared at the beginning.
933 * But we reserve them to keep our interest and make ready
934 * for the future change.
935 */
936 get_random_bytes(&sbi->s_next_generation,
937 sizeof(sbi->s_next_generation));
938 spin_lock_init(&sbi->s_next_gen_lock);
939
940 sb->s_op = &nilfs_sops;
941 sb->s_export_op = &nilfs_export_ops;
942 sb->s_root = NULL;
Ryusuke Konishi61239232009-04-06 19:02:00 -0700943 sb->s_time_gran = 1;
Ryusuke Konishi026a7d62010-10-07 14:19:48 +0900944
945 bdi = sb->s_bdev->bd_inode->i_mapping->backing_dev_info;
946 sb->s_bdi = bdi ? : &default_backing_dev_info;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700947
Ryusuke Konishif50a4c82009-11-19 16:58:40 +0900948 err = load_nilfs(nilfs, sbi);
949 if (err)
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +0900950 goto failed_nilfs;
Ryusuke Konishif50a4c82009-11-19 16:58:40 +0900951
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700952 cno = nilfs_last_cno(nilfs);
Ryusuke Konishiab4d8f72010-08-26 02:15:41 +0900953 err = nilfs_attach_checkpoint(sbi, cno, true, &fsroot);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700954 if (err) {
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900955 printk(KERN_ERR "NILFS: error loading last checkpoint "
956 "(checkpoint number=%llu).\n", (unsigned long long)cno);
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900957 goto failed_unload;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700958 }
959
960 if (!(sb->s_flags & MS_RDONLY)) {
Ryusuke Konishie912a5b2010-08-14 13:07:15 +0900961 err = nilfs_attach_segment_constructor(sbi, fsroot);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700962 if (err)
963 goto failed_checkpoint;
964 }
965
Ryusuke Konishi367ea332010-08-26 01:52:51 +0900966 err = nilfs_get_root_dentry(sb, fsroot, &sb->s_root);
967 if (err)
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700968 goto failed_segctor;
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700969
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900970 nilfs_put_root(fsroot);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700971
972 if (!(sb->s_flags & MS_RDONLY)) {
973 down_write(&nilfs->ns_sem);
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +0900974 nilfs_setup_super(sbi, true);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700975 up_write(&nilfs->ns_sem);
976 }
977
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700978 return 0;
979
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700980 failed_segctor:
981 nilfs_detach_segment_constructor(sbi);
982
983 failed_checkpoint:
Ryusuke Konishi4d8d9292010-08-25 17:45:44 +0900984 nilfs_put_root(fsroot);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700985
Ryusuke Konishif1e89c82010-09-05 12:20:59 +0900986 failed_unload:
987 iput(nilfs->ns_sufile);
988 iput(nilfs->ns_cpfile);
989 iput(nilfs->ns_dat);
990
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +0900991 failed_nilfs:
992 destroy_nilfs(nilfs);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700993
994 failed_sbi:
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700995 sb->s_fs_info = NULL;
Ryusuke Konishif11459a2010-08-16 01:54:52 +0900996 kfree(sbi);
Ryusuke Konishi783f6182009-04-06 19:01:35 -0700997 return err;
998}
999
1000static int nilfs_remount(struct super_block *sb, int *flags, char *data)
1001{
1002 struct nilfs_sb_info *sbi = NILFS_SB(sb);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001003 struct the_nilfs *nilfs = sbi->s_nilfs;
1004 unsigned long old_sb_flags;
1005 struct nilfs_mount_options old_opts;
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001006 int err;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001007
1008 old_sb_flags = sb->s_flags;
1009 old_opts.mount_opt = sbi->s_mount_opt;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001010
Ryusuke Konishi7c017452010-07-05 20:08:33 +09001011 if (!parse_options(data, sb, 1)) {
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001012 err = -EINVAL;
1013 goto restore_opts;
1014 }
1015 sb->s_flags = (sb->s_flags & ~MS_POSIXACL);
1016
Ryusuke Konishid240e062010-05-09 21:51:53 +09001017 err = -EINVAL;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001018
Ryusuke Konishi02345762009-11-20 03:28:01 +09001019 if (!nilfs_valid_fs(nilfs)) {
1020 printk(KERN_WARNING "NILFS (device %s): couldn't "
1021 "remount because the filesystem is in an "
1022 "incomplete recovery state.\n", sb->s_id);
Ryusuke Konishi02345762009-11-20 03:28:01 +09001023 goto restore_opts;
1024 }
1025
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001026 if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY))
1027 goto out;
1028 if (*flags & MS_RDONLY) {
1029 /* Shutting down the segment constructor */
1030 nilfs_detach_segment_constructor(sbi);
1031 sb->s_flags |= MS_RDONLY;
1032
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001033 /*
1034 * Remounting a valid RW partition RDONLY, so set
1035 * the RDONLY flag and then mark the partition as valid again.
1036 */
1037 down_write(&nilfs->ns_sem);
Ryusuke Konishi7ecaa462010-06-28 17:49:29 +09001038 nilfs_cleanup_super(sbi);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001039 up_write(&nilfs->ns_sem);
1040 } else {
Ryusuke Konishic5ca48a2010-07-22 03:22:20 +09001041 __u64 features;
Ryusuke Konishie912a5b2010-08-14 13:07:15 +09001042 struct nilfs_root *root;
Ryusuke Konishic5ca48a2010-07-22 03:22:20 +09001043
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001044 /*
1045 * Mounting a RDONLY partition read-write, so reread and
1046 * store the current valid flag. (It may have been changed
1047 * by fsck since we originally mounted the partition.)
1048 */
Ryusuke Konishic5ca48a2010-07-22 03:22:20 +09001049 down_read(&nilfs->ns_sem);
1050 features = le64_to_cpu(nilfs->ns_sbp[0]->s_feature_compat_ro) &
1051 ~NILFS_FEATURE_COMPAT_RO_SUPP;
1052 up_read(&nilfs->ns_sem);
1053 if (features) {
1054 printk(KERN_WARNING "NILFS (device %s): couldn't "
1055 "remount RDWR because of unsupported optional "
1056 "features (%llx)\n",
1057 sb->s_id, (unsigned long long)features);
1058 err = -EROFS;
1059 goto restore_opts;
1060 }
1061
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001062 sb->s_flags &= ~MS_RDONLY;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001063
Ryusuke Konishie912a5b2010-08-14 13:07:15 +09001064 root = NILFS_I(sb->s_root->d_inode)->i_root;
1065 err = nilfs_attach_segment_constructor(sbi, root);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001066 if (err)
Ryusuke Konishie59399d2009-06-08 01:39:32 +09001067 goto restore_opts;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001068
1069 down_write(&nilfs->ns_sem);
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +09001070 nilfs_setup_super(sbi, true);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001071 up_write(&nilfs->ns_sem);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001072 }
1073 out:
1074 return 0;
1075
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001076 restore_opts:
1077 sb->s_flags = old_sb_flags;
1078 sbi->s_mount_opt = old_opts.mount_opt;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001079 return err;
1080}
1081
1082struct nilfs_super_data {
1083 struct block_device *bdev;
Ryusuke Konishi6dd47402009-06-08 01:39:31 +09001084 struct nilfs_sb_info *sbi;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001085 __u64 cno;
1086 int flags;
1087};
1088
1089/**
1090 * nilfs_identify - pre-read mount options needed to identify mount instance
1091 * @data: mount options
1092 * @sd: nilfs_super_data
1093 */
1094static int nilfs_identify(char *data, struct nilfs_super_data *sd)
1095{
1096 char *p, *options = data;
1097 substring_t args[MAX_OPT_ARGS];
Ryusuke Konishic05dbfc2010-09-16 00:36:24 +09001098 int token;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001099 int ret = 0;
1100
1101 do {
1102 p = strsep(&options, ",");
1103 if (p != NULL && *p) {
1104 token = match_token(p, tokens, args);
1105 if (token == Opt_snapshot) {
Ryusuke Konishic05dbfc2010-09-16 00:36:24 +09001106 if (!(sd->flags & MS_RDONLY)) {
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001107 ret++;
Ryusuke Konishic05dbfc2010-09-16 00:36:24 +09001108 } else {
1109 sd->cno = simple_strtoull(args[0].from,
1110 NULL, 0);
1111 /*
1112 * No need to see the end pointer;
1113 * match_token() has done syntax
1114 * checking.
1115 */
1116 if (sd->cno == 0)
1117 ret++;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001118 }
1119 }
1120 if (ret)
1121 printk(KERN_ERR
1122 "NILFS: invalid mount option: %s\n", p);
1123 }
1124 if (!options)
1125 break;
1126 BUG_ON(options == data);
1127 *(options - 1) = ',';
1128 } while (!ret);
1129 return ret;
1130}
1131
1132static int nilfs_set_bdev_super(struct super_block *s, void *data)
1133{
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001134 s->s_bdev = data;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001135 s->s_dev = s->s_bdev->bd_dev;
1136 return 0;
1137}
1138
1139static int nilfs_test_bdev_super(struct super_block *s, void *data)
1140{
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001141 return (void *)s->s_bdev == data;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001142}
1143
Al Viroe4c59d62010-07-26 12:19:34 +04001144static struct dentry *
1145nilfs_mount(struct file_system_type *fs_type, int flags,
1146 const char *dev_name, void *data)
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001147{
1148 struct nilfs_super_data sd;
Ryusuke Konishi33c8e572009-06-08 01:39:29 +09001149 struct super_block *s;
Ryusuke Konishi13e90552010-05-09 02:57:57 +09001150 fmode_t mode = FMODE_READ;
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001151 struct dentry *root_dentry;
1152 int err, s_new = false;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001153
Ryusuke Konishi13e90552010-05-09 02:57:57 +09001154 if (!(flags & MS_RDONLY))
1155 mode |= FMODE_WRITE;
1156
1157 sd.bdev = open_bdev_exclusive(dev_name, mode, fs_type);
Jan Blunckd6d4c192010-02-24 13:25:32 +01001158 if (IS_ERR(sd.bdev))
Al Viroe4c59d62010-07-26 12:19:34 +04001159 return ERR_CAST(sd.bdev);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001160
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001161 sd.cno = 0;
1162 sd.flags = flags;
1163 if (nilfs_identify((char *)data, &sd)) {
1164 err = -EINVAL;
1165 goto failed;
1166 }
1167
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +09001168 /*
1169 * once the super is inserted into the list by sget, s_umount
1170 * will protect the lockfs code from trying to start a snapshot
1171 * while we are mounting
1172 */
1173 mutex_lock(&sd.bdev->bd_fsfreeze_mutex);
1174 if (sd.bdev->bd_fsfreeze_count > 0) {
1175 mutex_unlock(&sd.bdev->bd_fsfreeze_mutex);
1176 err = -EBUSY;
Ryusuke Konishi33c8e572009-06-08 01:39:29 +09001177 goto failed;
1178 }
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001179 s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, sd.bdev);
Ryusuke Konishi5beb6e02010-09-20 18:19:06 +09001180 mutex_unlock(&sd.bdev->bd_fsfreeze_mutex);
Ryusuke Konishi33c8e572009-06-08 01:39:29 +09001181 if (IS_ERR(s)) {
1182 err = PTR_ERR(s);
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001183 goto failed;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001184 }
1185
1186 if (!s->s_root) {
1187 char b[BDEVNAME_SIZE];
1188
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001189 s_new = true;
1190
Ryusuke Konishi33c8e572009-06-08 01:39:29 +09001191 /* New superblock instance created */
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001192 s->s_flags = flags;
Ryusuke Konishi4571b822010-05-09 03:01:32 +09001193 s->s_mode = mode;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001194 strlcpy(s->s_id, bdevname(sd.bdev, b), sizeof(s->s_id));
1195 sb_set_blocksize(s, block_size(sd.bdev));
1196
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001197 err = nilfs_fill_super(s, data, flags & MS_SILENT ? 1 : 0);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001198 if (err)
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001199 goto failed_super;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001200
1201 s->s_flags |= MS_ACTIVE;
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001202 } else if (!sd.cno) {
1203 int busy = false;
1204
1205 if (nilfs_tree_was_touched(s->s_root)) {
1206 busy = nilfs_try_to_shrink_tree(s->s_root);
1207 if (busy && (flags ^ s->s_flags) & MS_RDONLY) {
1208 printk(KERN_ERR "NILFS: the device already "
1209 "has a %s mount.\n",
1210 (s->s_flags & MS_RDONLY) ?
1211 "read-only" : "read/write");
1212 err = -EBUSY;
1213 goto failed_super;
1214 }
1215 }
1216 if (!busy) {
1217 /*
1218 * Try remount to setup mount states if the current
1219 * tree is not mounted and only snapshots use this sb.
1220 */
1221 err = nilfs_remount(s, &flags, data);
1222 if (err)
1223 goto failed_super;
1224 }
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001225 }
1226
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001227 if (sd.cno) {
1228 err = nilfs_attach_snapshot(s, sd.cno, &root_dentry);
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001229 if (err)
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001230 goto failed_super;
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001231 } else {
1232 root_dentry = dget(s->s_root);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001233 }
1234
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001235 if (!s_new)
Ryusuke Konishi13e90552010-05-09 02:57:57 +09001236 close_bdev_exclusive(sd.bdev, mode);
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001237
Al Viroe4c59d62010-07-26 12:19:34 +04001238 return root_dentry;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001239
Ryusuke Konishif11459a2010-08-16 01:54:52 +09001240 failed_super:
Al Viroa95161a2009-08-09 00:52:02 +04001241 deactivate_locked_super(s);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001242
Ryusuke Konishi348fe8d2010-09-09 02:07:56 +09001243 failed:
1244 if (!s_new)
1245 close_bdev_exclusive(sd.bdev, mode);
Al Viroe4c59d62010-07-26 12:19:34 +04001246 return ERR_PTR(err);
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001247}
1248
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001249struct file_system_type nilfs_fs_type = {
1250 .owner = THIS_MODULE,
1251 .name = "nilfs2",
Al Viroe4c59d62010-07-26 12:19:34 +04001252 .mount = nilfs_mount,
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001253 .kill_sb = kill_block_super,
1254 .fs_flags = FS_REQUIRES_DEV,
1255};
1256
Li Hong41c88bd2010-04-06 00:54:11 +08001257static void nilfs_inode_init_once(void *obj)
1258{
1259 struct nilfs_inode_info *ii = obj;
1260
1261 INIT_LIST_HEAD(&ii->i_dirty);
1262#ifdef CONFIG_NILFS_XATTR
1263 init_rwsem(&ii->xattr_sem);
1264#endif
1265 nilfs_btnode_cache_init_once(&ii->i_btnode_cache);
Ryusuke Konishi05d0e942010-07-10 20:52:09 +09001266 ii->i_bmap = &ii->i_bmap_data;
Li Hong41c88bd2010-04-06 00:54:11 +08001267 inode_init_once(&ii->vfs_inode);
1268}
1269
1270static void nilfs_segbuf_init_once(void *obj)
1271{
1272 memset(obj, 0, sizeof(struct nilfs_segment_buffer));
1273}
1274
1275static void nilfs_destroy_cachep(void)
1276{
Ryusuke Konishi84cb0992010-05-22 12:49:32 +09001277 if (nilfs_inode_cachep)
Li Hong41c88bd2010-04-06 00:54:11 +08001278 kmem_cache_destroy(nilfs_inode_cachep);
Ryusuke Konishi84cb0992010-05-22 12:49:32 +09001279 if (nilfs_transaction_cachep)
Li Hong41c88bd2010-04-06 00:54:11 +08001280 kmem_cache_destroy(nilfs_transaction_cachep);
Ryusuke Konishi84cb0992010-05-22 12:49:32 +09001281 if (nilfs_segbuf_cachep)
Li Hong41c88bd2010-04-06 00:54:11 +08001282 kmem_cache_destroy(nilfs_segbuf_cachep);
Ryusuke Konishi84cb0992010-05-22 12:49:32 +09001283 if (nilfs_btree_path_cache)
Li Hong41c88bd2010-04-06 00:54:11 +08001284 kmem_cache_destroy(nilfs_btree_path_cache);
1285}
1286
1287static int __init nilfs_init_cachep(void)
1288{
1289 nilfs_inode_cachep = kmem_cache_create("nilfs2_inode_cache",
1290 sizeof(struct nilfs_inode_info), 0,
1291 SLAB_RECLAIM_ACCOUNT, nilfs_inode_init_once);
1292 if (!nilfs_inode_cachep)
1293 goto fail;
1294
1295 nilfs_transaction_cachep = kmem_cache_create("nilfs2_transaction_cache",
1296 sizeof(struct nilfs_transaction_info), 0,
1297 SLAB_RECLAIM_ACCOUNT, NULL);
1298 if (!nilfs_transaction_cachep)
1299 goto fail;
1300
1301 nilfs_segbuf_cachep = kmem_cache_create("nilfs2_segbuf_cache",
1302 sizeof(struct nilfs_segment_buffer), 0,
1303 SLAB_RECLAIM_ACCOUNT, nilfs_segbuf_init_once);
1304 if (!nilfs_segbuf_cachep)
1305 goto fail;
1306
1307 nilfs_btree_path_cache = kmem_cache_create("nilfs2_btree_path_cache",
1308 sizeof(struct nilfs_btree_path) * NILFS_BTREE_LEVEL_MAX,
1309 0, 0, NULL);
1310 if (!nilfs_btree_path_cache)
1311 goto fail;
1312
1313 return 0;
1314
1315fail:
1316 nilfs_destroy_cachep();
1317 return -ENOMEM;
1318}
1319
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001320static int __init init_nilfs_fs(void)
1321{
1322 int err;
1323
Li Hong41c88bd2010-04-06 00:54:11 +08001324 err = nilfs_init_cachep();
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001325 if (err)
Li Hong41c88bd2010-04-06 00:54:11 +08001326 goto fail;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001327
1328 err = register_filesystem(&nilfs_fs_type);
1329 if (err)
Li Hong41c88bd2010-04-06 00:54:11 +08001330 goto free_cachep;
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001331
Li Hong9f130262010-04-09 23:09:53 +08001332 printk(KERN_INFO "NILFS version 2 loaded\n");
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001333 return 0;
1334
Li Hong41c88bd2010-04-06 00:54:11 +08001335free_cachep:
1336 nilfs_destroy_cachep();
1337fail:
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001338 return err;
1339}
1340
1341static void __exit exit_nilfs_fs(void)
1342{
Li Hong41c88bd2010-04-06 00:54:11 +08001343 nilfs_destroy_cachep();
Ryusuke Konishi783f6182009-04-06 19:01:35 -07001344 unregister_filesystem(&nilfs_fs_type);
1345}
1346
1347module_init(init_nilfs_fs)
1348module_exit(exit_nilfs_fs)