Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1 | /* |
| 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> |
| 48 | #include <linux/smp_lock.h> |
| 49 | #include <linux/vfs.h> |
| 50 | #include <linux/writeback.h> |
| 51 | #include <linux/kobject.h> |
| 52 | #include <linux/exportfs.h> |
| 53 | #include "nilfs.h" |
| 54 | #include "mdt.h" |
| 55 | #include "alloc.h" |
| 56 | #include "page.h" |
| 57 | #include "cpfile.h" |
| 58 | #include "ifile.h" |
| 59 | #include "dat.h" |
| 60 | #include "segment.h" |
| 61 | #include "segbuf.h" |
| 62 | |
| 63 | MODULE_AUTHOR("NTT Corp."); |
| 64 | MODULE_DESCRIPTION("A New Implementation of the Log-structured Filesystem " |
| 65 | "(NILFS)"); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 66 | MODULE_LICENSE("GPL"); |
| 67 | |
Christoph Hellwig | 8c85e12 | 2009-04-28 18:00:26 +0200 | [diff] [blame] | 68 | static void nilfs_write_super(struct super_block *sb); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 69 | static int nilfs_remount(struct super_block *sb, int *flags, char *data); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 70 | |
| 71 | /** |
| 72 | * nilfs_error() - report failure condition on a filesystem |
| 73 | * |
| 74 | * nilfs_error() sets an ERROR_FS flag on the superblock as well as |
| 75 | * reporting an error message. It should be called when NILFS detects |
| 76 | * incoherences or defects of meta data on disk. As for sustainable |
| 77 | * errors such as a single-shot I/O error, nilfs_warning() or the printk() |
| 78 | * function should be used instead. |
| 79 | * |
| 80 | * The segment constructor must not call this function because it can |
| 81 | * kill itself. |
| 82 | */ |
| 83 | void nilfs_error(struct super_block *sb, const char *function, |
| 84 | const char *fmt, ...) |
| 85 | { |
| 86 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
| 87 | va_list args; |
| 88 | |
| 89 | va_start(args, fmt); |
| 90 | printk(KERN_CRIT "NILFS error (device %s): %s: ", sb->s_id, function); |
| 91 | vprintk(fmt, args); |
| 92 | printk("\n"); |
| 93 | va_end(args); |
| 94 | |
| 95 | if (!(sb->s_flags & MS_RDONLY)) { |
| 96 | struct the_nilfs *nilfs = sbi->s_nilfs; |
| 97 | |
| 98 | if (!nilfs_test_opt(sbi, ERRORS_CONT)) |
| 99 | nilfs_detach_segment_constructor(sbi); |
| 100 | |
| 101 | down_write(&nilfs->ns_sem); |
| 102 | if (!(nilfs->ns_mount_state & NILFS_ERROR_FS)) { |
| 103 | nilfs->ns_mount_state |= NILFS_ERROR_FS; |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 104 | nilfs->ns_sbp[0]->s_state |= |
| 105 | cpu_to_le16(NILFS_ERROR_FS); |
| 106 | nilfs_commit_super(sbi, 1); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 107 | } |
| 108 | up_write(&nilfs->ns_sem); |
| 109 | |
| 110 | if (nilfs_test_opt(sbi, ERRORS_RO)) { |
| 111 | printk(KERN_CRIT "Remounting filesystem read-only\n"); |
| 112 | sb->s_flags |= MS_RDONLY; |
| 113 | } |
| 114 | } |
| 115 | |
| 116 | if (nilfs_test_opt(sbi, ERRORS_PANIC)) |
| 117 | panic("NILFS (device %s): panic forced after error\n", |
| 118 | sb->s_id); |
| 119 | } |
| 120 | |
| 121 | void nilfs_warning(struct super_block *sb, const char *function, |
| 122 | const char *fmt, ...) |
| 123 | { |
| 124 | va_list args; |
| 125 | |
| 126 | va_start(args, fmt); |
| 127 | printk(KERN_WARNING "NILFS warning (device %s): %s: ", |
| 128 | sb->s_id, function); |
| 129 | vprintk(fmt, args); |
| 130 | printk("\n"); |
| 131 | va_end(args); |
| 132 | } |
| 133 | |
| 134 | static struct kmem_cache *nilfs_inode_cachep; |
| 135 | |
Ryusuke Konishi | a53b475 | 2009-05-27 22:11:46 +0900 | [diff] [blame] | 136 | struct inode *nilfs_alloc_inode_common(struct the_nilfs *nilfs) |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 137 | { |
| 138 | struct nilfs_inode_info *ii; |
| 139 | |
| 140 | ii = kmem_cache_alloc(nilfs_inode_cachep, GFP_NOFS); |
| 141 | if (!ii) |
| 142 | return NULL; |
| 143 | ii->i_bh = NULL; |
| 144 | ii->i_state = 0; |
| 145 | ii->vfs_inode.i_version = 1; |
Ryusuke Konishi | a53b475 | 2009-05-27 22:11:46 +0900 | [diff] [blame] | 146 | nilfs_btnode_cache_init(&ii->i_btnode_cache, nilfs->ns_bdi); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 147 | return &ii->vfs_inode; |
| 148 | } |
| 149 | |
Ryusuke Konishi | a53b475 | 2009-05-27 22:11:46 +0900 | [diff] [blame] | 150 | struct inode *nilfs_alloc_inode(struct super_block *sb) |
| 151 | { |
| 152 | return nilfs_alloc_inode_common(NILFS_SB(sb)->s_nilfs); |
| 153 | } |
| 154 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 155 | void nilfs_destroy_inode(struct inode *inode) |
| 156 | { |
| 157 | kmem_cache_free(nilfs_inode_cachep, NILFS_I(inode)); |
| 158 | } |
| 159 | |
| 160 | static void init_once(void *obj) |
| 161 | { |
| 162 | struct nilfs_inode_info *ii = obj; |
| 163 | |
| 164 | INIT_LIST_HEAD(&ii->i_dirty); |
| 165 | #ifdef CONFIG_NILFS_XATTR |
| 166 | init_rwsem(&ii->xattr_sem); |
| 167 | #endif |
| 168 | nilfs_btnode_cache_init_once(&ii->i_btnode_cache); |
| 169 | ii->i_bmap = (struct nilfs_bmap *)&ii->i_bmap_union; |
| 170 | inode_init_once(&ii->vfs_inode); |
| 171 | } |
| 172 | |
| 173 | static int nilfs_init_inode_cache(void) |
| 174 | { |
| 175 | nilfs_inode_cachep = kmem_cache_create("nilfs2_inode_cache", |
| 176 | sizeof(struct nilfs_inode_info), |
| 177 | 0, SLAB_RECLAIM_ACCOUNT, |
| 178 | init_once); |
| 179 | |
| 180 | return (nilfs_inode_cachep == NULL) ? -ENOMEM : 0; |
| 181 | } |
| 182 | |
| 183 | static inline void nilfs_destroy_inode_cache(void) |
| 184 | { |
| 185 | kmem_cache_destroy(nilfs_inode_cachep); |
| 186 | } |
| 187 | |
| 188 | static void nilfs_clear_inode(struct inode *inode) |
| 189 | { |
| 190 | struct nilfs_inode_info *ii = NILFS_I(inode); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 191 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 192 | /* |
| 193 | * Free resources allocated in nilfs_read_inode(), here. |
| 194 | */ |
Ryusuke Konishi | a2e7d2d | 2009-04-06 19:01:44 -0700 | [diff] [blame] | 195 | BUG_ON(!list_empty(&ii->i_dirty)); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 196 | brelse(ii->i_bh); |
| 197 | ii->i_bh = NULL; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 198 | |
| 199 | if (test_bit(NILFS_I_BMAP, &ii->i_state)) |
| 200 | nilfs_bmap_clear(ii->i_bmap); |
| 201 | |
| 202 | nilfs_btnode_cache_clear(&ii->i_btnode_cache); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 203 | } |
| 204 | |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 205 | static int nilfs_sync_super(struct nilfs_sb_info *sbi, int dupsb) |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 206 | { |
| 207 | struct the_nilfs *nilfs = sbi->s_nilfs; |
| 208 | int err; |
| 209 | int barrier_done = 0; |
| 210 | |
| 211 | if (nilfs_test_opt(sbi, BARRIER)) { |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 212 | set_buffer_ordered(nilfs->ns_sbh[0]); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 213 | barrier_done = 1; |
| 214 | } |
| 215 | retry: |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 216 | set_buffer_dirty(nilfs->ns_sbh[0]); |
| 217 | err = sync_dirty_buffer(nilfs->ns_sbh[0]); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 218 | if (err == -EOPNOTSUPP && barrier_done) { |
| 219 | nilfs_warning(sbi->s_super, __func__, |
| 220 | "barrier-based sync failed. " |
| 221 | "disabling barriers\n"); |
| 222 | nilfs_clear_opt(sbi, BARRIER); |
| 223 | barrier_done = 0; |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 224 | clear_buffer_ordered(nilfs->ns_sbh[0]); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 225 | goto retry; |
| 226 | } |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 227 | if (unlikely(err)) { |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 228 | printk(KERN_ERR |
| 229 | "NILFS: unable to write superblock (err=%d)\n", err); |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 230 | if (err == -EIO && nilfs->ns_sbh[1]) { |
| 231 | nilfs_fall_back_super_block(nilfs); |
| 232 | goto retry; |
| 233 | } |
| 234 | } else { |
| 235 | struct nilfs_super_block *sbp = nilfs->ns_sbp[0]; |
| 236 | |
| 237 | /* |
| 238 | * The latest segment becomes trailable from the position |
| 239 | * written in superblock. |
| 240 | */ |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 241 | clear_nilfs_discontinued(nilfs); |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 242 | |
| 243 | /* update GC protection for recent segments */ |
| 244 | if (nilfs->ns_sbh[1]) { |
| 245 | sbp = NULL; |
| 246 | if (dupsb) { |
| 247 | set_buffer_dirty(nilfs->ns_sbh[1]); |
| 248 | if (!sync_dirty_buffer(nilfs->ns_sbh[1])) |
| 249 | sbp = nilfs->ns_sbp[1]; |
| 250 | } |
| 251 | } |
| 252 | if (sbp) { |
| 253 | spin_lock(&nilfs->ns_last_segment_lock); |
| 254 | nilfs->ns_prot_seq = le64_to_cpu(sbp->s_last_seq); |
| 255 | spin_unlock(&nilfs->ns_last_segment_lock); |
| 256 | } |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 257 | } |
| 258 | |
| 259 | return err; |
| 260 | } |
| 261 | |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 262 | int nilfs_commit_super(struct nilfs_sb_info *sbi, int dupsb) |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 263 | { |
| 264 | struct the_nilfs *nilfs = sbi->s_nilfs; |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 265 | struct nilfs_super_block **sbp = nilfs->ns_sbp; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 266 | sector_t nfreeblocks; |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 267 | time_t t; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 268 | int err; |
| 269 | |
| 270 | /* nilfs->sem must be locked by the caller. */ |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 271 | if (sbp[0]->s_magic != NILFS_SUPER_MAGIC) { |
| 272 | if (sbp[1] && sbp[1]->s_magic == NILFS_SUPER_MAGIC) |
| 273 | nilfs_swap_super_block(nilfs); |
| 274 | else { |
| 275 | printk(KERN_CRIT "NILFS: superblock broke on dev %s\n", |
| 276 | sbi->s_super->s_id); |
| 277 | return -EIO; |
| 278 | } |
| 279 | } |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 280 | err = nilfs_count_free_blocks(nilfs, &nfreeblocks); |
| 281 | if (unlikely(err)) { |
| 282 | printk(KERN_ERR "NILFS: failed to count free blocks\n"); |
| 283 | return err; |
| 284 | } |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 285 | spin_lock(&nilfs->ns_last_segment_lock); |
| 286 | sbp[0]->s_last_seq = cpu_to_le64(nilfs->ns_last_seq); |
| 287 | sbp[0]->s_last_pseg = cpu_to_le64(nilfs->ns_last_pseg); |
| 288 | sbp[0]->s_last_cno = cpu_to_le64(nilfs->ns_last_cno); |
| 289 | spin_unlock(&nilfs->ns_last_segment_lock); |
| 290 | |
| 291 | t = get_seconds(); |
| 292 | nilfs->ns_sbwtime[0] = t; |
| 293 | sbp[0]->s_free_blocks_count = cpu_to_le64(nfreeblocks); |
| 294 | sbp[0]->s_wtime = cpu_to_le64(t); |
| 295 | sbp[0]->s_sum = 0; |
| 296 | sbp[0]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed, |
| 297 | (unsigned char *)sbp[0], |
| 298 | nilfs->ns_sbsize)); |
| 299 | if (dupsb && sbp[1]) { |
| 300 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); |
| 301 | nilfs->ns_sbwtime[1] = t; |
| 302 | } |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 303 | sbi->s_super->s_dirt = 0; |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 304 | return nilfs_sync_super(sbi, dupsb); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 305 | } |
| 306 | |
| 307 | static void nilfs_put_super(struct super_block *sb) |
| 308 | { |
| 309 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
| 310 | struct the_nilfs *nilfs = sbi->s_nilfs; |
| 311 | |
Christoph Hellwig | 6cfd014 | 2009-05-05 15:40:36 +0200 | [diff] [blame] | 312 | lock_kernel(); |
| 313 | |
Christoph Hellwig | 8c85e12 | 2009-04-28 18:00:26 +0200 | [diff] [blame] | 314 | if (sb->s_dirt) |
| 315 | nilfs_write_super(sb); |
| 316 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 317 | nilfs_detach_segment_constructor(sbi); |
| 318 | |
| 319 | if (!(sb->s_flags & MS_RDONLY)) { |
| 320 | down_write(&nilfs->ns_sem); |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 321 | nilfs->ns_sbp[0]->s_state = cpu_to_le16(nilfs->ns_mount_state); |
| 322 | nilfs_commit_super(sbi, 1); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 323 | up_write(&nilfs->ns_sem); |
| 324 | } |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 325 | down_write(&nilfs->ns_super_sem); |
Ryusuke Konishi | 3f82ff5 | 2009-06-08 01:39:30 +0900 | [diff] [blame] | 326 | if (nilfs->ns_current == sbi) |
| 327 | nilfs->ns_current = NULL; |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 328 | up_write(&nilfs->ns_super_sem); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 329 | |
| 330 | nilfs_detach_checkpoint(sbi); |
| 331 | put_nilfs(sbi->s_nilfs); |
| 332 | sbi->s_super = NULL; |
| 333 | sb->s_fs_info = NULL; |
Ryusuke Konishi | 6dd4740 | 2009-06-08 01:39:31 +0900 | [diff] [blame] | 334 | nilfs_put_sbinfo(sbi); |
Christoph Hellwig | 6cfd014 | 2009-05-05 15:40:36 +0200 | [diff] [blame] | 335 | |
| 336 | unlock_kernel(); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 337 | } |
| 338 | |
| 339 | /** |
| 340 | * nilfs_write_super - write super block(s) of NILFS |
| 341 | * @sb: super_block |
| 342 | * |
| 343 | * nilfs_write_super() gets a fs-dependent lock, writes super block(s), and |
| 344 | * clears s_dirt. This function is called in the section protected by |
| 345 | * lock_super(). |
| 346 | * |
| 347 | * The s_dirt flag is managed by each filesystem and we protect it by ns_sem |
| 348 | * of the struct the_nilfs. Lock order must be as follows: |
| 349 | * |
| 350 | * 1. lock_super() |
| 351 | * 2. down_write(&nilfs->ns_sem) |
| 352 | * |
| 353 | * Inside NILFS, locking ns_sem is enough to protect s_dirt and the buffer |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 354 | * of the super block (nilfs->ns_sbp[]). |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 355 | * |
| 356 | * In most cases, VFS functions call lock_super() before calling these |
| 357 | * methods. So we must be careful not to bring on deadlocks when using |
| 358 | * lock_super(); see generic_shutdown_super(), write_super(), and so on. |
| 359 | * |
| 360 | * Note that order of lock_kernel() and lock_super() depends on contexts |
| 361 | * of VFS. We should also note that lock_kernel() can be used in its |
| 362 | * protective section and only the outermost one has an effect. |
| 363 | */ |
| 364 | static void nilfs_write_super(struct super_block *sb) |
| 365 | { |
| 366 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
| 367 | struct the_nilfs *nilfs = sbi->s_nilfs; |
| 368 | |
| 369 | down_write(&nilfs->ns_sem); |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 370 | if (!(sb->s_flags & MS_RDONLY)) { |
| 371 | struct nilfs_super_block **sbp = nilfs->ns_sbp; |
| 372 | u64 t = get_seconds(); |
| 373 | int dupsb; |
| 374 | |
| 375 | if (!nilfs_discontinued(nilfs) && t >= nilfs->ns_sbwtime[0] && |
| 376 | t < nilfs->ns_sbwtime[0] + NILFS_SB_FREQ) { |
| 377 | up_write(&nilfs->ns_sem); |
| 378 | return; |
| 379 | } |
| 380 | dupsb = sbp[1] && t > nilfs->ns_sbwtime[1] + NILFS_ALTSB_FREQ; |
| 381 | nilfs_commit_super(sbi, dupsb); |
| 382 | } |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 383 | sb->s_dirt = 0; |
| 384 | up_write(&nilfs->ns_sem); |
| 385 | } |
| 386 | |
| 387 | static int nilfs_sync_fs(struct super_block *sb, int wait) |
| 388 | { |
| 389 | int err = 0; |
| 390 | |
Christoph Hellwig | d731e06 | 2009-06-08 10:08:36 +0200 | [diff] [blame] | 391 | nilfs_write_super(sb); |
| 392 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 393 | /* This function is called when super block should be written back */ |
| 394 | if (wait) |
| 395 | err = nilfs_construct_segment(sb); |
| 396 | return err; |
| 397 | } |
| 398 | |
| 399 | int nilfs_attach_checkpoint(struct nilfs_sb_info *sbi, __u64 cno) |
| 400 | { |
| 401 | struct the_nilfs *nilfs = sbi->s_nilfs; |
| 402 | struct nilfs_checkpoint *raw_cp; |
| 403 | struct buffer_head *bh_cp; |
| 404 | int err; |
| 405 | |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 406 | down_write(&nilfs->ns_super_sem); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 407 | list_add(&sbi->s_list, &nilfs->ns_supers); |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 408 | up_write(&nilfs->ns_super_sem); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 409 | |
| 410 | sbi->s_ifile = nilfs_mdt_new( |
| 411 | nilfs, sbi->s_super, NILFS_IFILE_INO, NILFS_IFILE_GFP); |
| 412 | if (!sbi->s_ifile) |
| 413 | return -ENOMEM; |
| 414 | |
| 415 | err = nilfs_palloc_init_blockgroup(sbi->s_ifile, nilfs->ns_inode_size); |
| 416 | if (unlikely(err)) |
| 417 | goto failed; |
| 418 | |
Zhang Qiang | 1154ecb | 2009-08-18 14:58:24 +0800 | [diff] [blame] | 419 | down_read(&nilfs->ns_segctor_sem); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 420 | err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, cno, 0, &raw_cp, |
| 421 | &bh_cp); |
Zhang Qiang | 1154ecb | 2009-08-18 14:58:24 +0800 | [diff] [blame] | 422 | up_read(&nilfs->ns_segctor_sem); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 423 | if (unlikely(err)) { |
| 424 | if (err == -ENOENT || err == -EINVAL) { |
| 425 | printk(KERN_ERR |
| 426 | "NILFS: Invalid checkpoint " |
| 427 | "(checkpoint number=%llu)\n", |
| 428 | (unsigned long long)cno); |
| 429 | err = -EINVAL; |
| 430 | } |
| 431 | goto failed; |
| 432 | } |
| 433 | err = nilfs_read_inode_common(sbi->s_ifile, &raw_cp->cp_ifile_inode); |
| 434 | if (unlikely(err)) |
| 435 | goto failed_bh; |
| 436 | atomic_set(&sbi->s_inodes_count, le64_to_cpu(raw_cp->cp_inodes_count)); |
| 437 | atomic_set(&sbi->s_blocks_count, le64_to_cpu(raw_cp->cp_blocks_count)); |
| 438 | |
| 439 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); |
| 440 | return 0; |
| 441 | |
| 442 | failed_bh: |
| 443 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); |
| 444 | failed: |
| 445 | nilfs_mdt_destroy(sbi->s_ifile); |
| 446 | sbi->s_ifile = NULL; |
| 447 | |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 448 | down_write(&nilfs->ns_super_sem); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 449 | list_del_init(&sbi->s_list); |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 450 | up_write(&nilfs->ns_super_sem); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 451 | |
| 452 | return err; |
| 453 | } |
| 454 | |
| 455 | void nilfs_detach_checkpoint(struct nilfs_sb_info *sbi) |
| 456 | { |
| 457 | struct the_nilfs *nilfs = sbi->s_nilfs; |
| 458 | |
| 459 | nilfs_mdt_clear(sbi->s_ifile); |
| 460 | nilfs_mdt_destroy(sbi->s_ifile); |
| 461 | sbi->s_ifile = NULL; |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 462 | down_write(&nilfs->ns_super_sem); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 463 | list_del_init(&sbi->s_list); |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 464 | up_write(&nilfs->ns_super_sem); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 465 | } |
| 466 | |
| 467 | static int nilfs_mark_recovery_complete(struct nilfs_sb_info *sbi) |
| 468 | { |
| 469 | struct the_nilfs *nilfs = sbi->s_nilfs; |
| 470 | int err = 0; |
| 471 | |
| 472 | down_write(&nilfs->ns_sem); |
| 473 | if (!(nilfs->ns_mount_state & NILFS_VALID_FS)) { |
| 474 | nilfs->ns_mount_state |= NILFS_VALID_FS; |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 475 | err = nilfs_commit_super(sbi, 1); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 476 | if (likely(!err)) |
| 477 | printk(KERN_INFO "NILFS: recovery complete.\n"); |
| 478 | } |
| 479 | up_write(&nilfs->ns_sem); |
| 480 | return err; |
| 481 | } |
| 482 | |
| 483 | static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
| 484 | { |
| 485 | struct super_block *sb = dentry->d_sb; |
| 486 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
Ryusuke Konishi | c306af2 | 2009-03-26 10:16:57 +0900 | [diff] [blame] | 487 | struct the_nilfs *nilfs = sbi->s_nilfs; |
| 488 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 489 | unsigned long long blocks; |
| 490 | unsigned long overhead; |
| 491 | unsigned long nrsvblocks; |
| 492 | sector_t nfreeblocks; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 493 | int err; |
| 494 | |
| 495 | /* |
| 496 | * Compute all of the segment blocks |
| 497 | * |
| 498 | * The blocks before first segment and after last segment |
| 499 | * are excluded. |
| 500 | */ |
| 501 | blocks = nilfs->ns_blocks_per_segment * nilfs->ns_nsegments |
| 502 | - nilfs->ns_first_data_block; |
| 503 | nrsvblocks = nilfs->ns_nrsvsegs * nilfs->ns_blocks_per_segment; |
| 504 | |
| 505 | /* |
| 506 | * Compute the overhead |
| 507 | * |
| 508 | * When distributing meta data blocks outside semgent structure, |
| 509 | * We must count them as the overhead. |
| 510 | */ |
| 511 | overhead = 0; |
| 512 | |
| 513 | err = nilfs_count_free_blocks(nilfs, &nfreeblocks); |
| 514 | if (unlikely(err)) |
| 515 | return err; |
| 516 | |
| 517 | buf->f_type = NILFS_SUPER_MAGIC; |
| 518 | buf->f_bsize = sb->s_blocksize; |
| 519 | buf->f_blocks = blocks - overhead; |
| 520 | buf->f_bfree = nfreeblocks; |
| 521 | buf->f_bavail = (buf->f_bfree >= nrsvblocks) ? |
| 522 | (buf->f_bfree - nrsvblocks) : 0; |
| 523 | buf->f_files = atomic_read(&sbi->s_inodes_count); |
| 524 | buf->f_ffree = 0; /* nilfs_count_free_inodes(sb); */ |
| 525 | buf->f_namelen = NILFS_NAME_LEN; |
Ryusuke Konishi | c306af2 | 2009-03-26 10:16:57 +0900 | [diff] [blame] | 526 | buf->f_fsid.val[0] = (u32)id; |
| 527 | buf->f_fsid.val[1] = (u32)(id >> 32); |
| 528 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 529 | return 0; |
| 530 | } |
| 531 | |
| 532 | static struct super_operations nilfs_sops = { |
| 533 | .alloc_inode = nilfs_alloc_inode, |
| 534 | .destroy_inode = nilfs_destroy_inode, |
| 535 | .dirty_inode = nilfs_dirty_inode, |
| 536 | /* .write_inode = nilfs_write_inode, */ |
| 537 | /* .put_inode = nilfs_put_inode, */ |
| 538 | /* .drop_inode = nilfs_drop_inode, */ |
| 539 | .delete_inode = nilfs_delete_inode, |
| 540 | .put_super = nilfs_put_super, |
| 541 | .write_super = nilfs_write_super, |
| 542 | .sync_fs = nilfs_sync_fs, |
| 543 | /* .write_super_lockfs */ |
| 544 | /* .unlockfs */ |
| 545 | .statfs = nilfs_statfs, |
| 546 | .remount_fs = nilfs_remount, |
| 547 | .clear_inode = nilfs_clear_inode, |
| 548 | /* .umount_begin */ |
| 549 | /* .show_options */ |
| 550 | }; |
| 551 | |
| 552 | static struct inode * |
| 553 | nilfs_nfs_get_inode(struct super_block *sb, u64 ino, u32 generation) |
| 554 | { |
| 555 | struct inode *inode; |
| 556 | |
| 557 | if (ino < NILFS_FIRST_INO(sb) && ino != NILFS_ROOT_INO && |
| 558 | ino != NILFS_SKETCH_INO) |
| 559 | return ERR_PTR(-ESTALE); |
| 560 | |
| 561 | inode = nilfs_iget(sb, ino); |
| 562 | if (IS_ERR(inode)) |
| 563 | return ERR_CAST(inode); |
| 564 | if (generation && inode->i_generation != generation) { |
| 565 | iput(inode); |
| 566 | return ERR_PTR(-ESTALE); |
| 567 | } |
| 568 | |
| 569 | return inode; |
| 570 | } |
| 571 | |
| 572 | static struct dentry * |
| 573 | nilfs_fh_to_dentry(struct super_block *sb, struct fid *fid, int fh_len, |
| 574 | int fh_type) |
| 575 | { |
| 576 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, |
| 577 | nilfs_nfs_get_inode); |
| 578 | } |
| 579 | |
| 580 | static struct dentry * |
| 581 | nilfs_fh_to_parent(struct super_block *sb, struct fid *fid, int fh_len, |
| 582 | int fh_type) |
| 583 | { |
| 584 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, |
| 585 | nilfs_nfs_get_inode); |
| 586 | } |
| 587 | |
| 588 | static struct export_operations nilfs_export_ops = { |
| 589 | .fh_to_dentry = nilfs_fh_to_dentry, |
| 590 | .fh_to_parent = nilfs_fh_to_parent, |
| 591 | .get_parent = nilfs_get_parent, |
| 592 | }; |
| 593 | |
| 594 | enum { |
| 595 | Opt_err_cont, Opt_err_panic, Opt_err_ro, |
| 596 | Opt_barrier, Opt_snapshot, Opt_order, |
| 597 | Opt_err, |
| 598 | }; |
| 599 | |
| 600 | static match_table_t tokens = { |
| 601 | {Opt_err_cont, "errors=continue"}, |
| 602 | {Opt_err_panic, "errors=panic"}, |
| 603 | {Opt_err_ro, "errors=remount-ro"}, |
| 604 | {Opt_barrier, "barrier=%s"}, |
| 605 | {Opt_snapshot, "cp=%u"}, |
| 606 | {Opt_order, "order=%s"}, |
| 607 | {Opt_err, NULL} |
| 608 | }; |
| 609 | |
| 610 | static int match_bool(substring_t *s, int *result) |
| 611 | { |
| 612 | int len = s->to - s->from; |
| 613 | |
| 614 | if (strncmp(s->from, "on", len) == 0) |
| 615 | *result = 1; |
| 616 | else if (strncmp(s->from, "off", len) == 0) |
| 617 | *result = 0; |
| 618 | else |
| 619 | return 1; |
| 620 | return 0; |
| 621 | } |
| 622 | |
| 623 | static int parse_options(char *options, struct super_block *sb) |
| 624 | { |
| 625 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
| 626 | char *p; |
| 627 | substring_t args[MAX_OPT_ARGS]; |
| 628 | int option; |
| 629 | |
| 630 | if (!options) |
| 631 | return 1; |
| 632 | |
| 633 | while ((p = strsep(&options, ",")) != NULL) { |
| 634 | int token; |
| 635 | if (!*p) |
| 636 | continue; |
| 637 | |
| 638 | token = match_token(p, tokens, args); |
| 639 | switch (token) { |
| 640 | case Opt_barrier: |
| 641 | if (match_bool(&args[0], &option)) |
| 642 | return 0; |
| 643 | if (option) |
| 644 | nilfs_set_opt(sbi, BARRIER); |
| 645 | else |
| 646 | nilfs_clear_opt(sbi, BARRIER); |
| 647 | break; |
| 648 | case Opt_order: |
| 649 | if (strcmp(args[0].from, "relaxed") == 0) |
| 650 | /* Ordered data semantics */ |
| 651 | nilfs_clear_opt(sbi, STRICT_ORDER); |
| 652 | else if (strcmp(args[0].from, "strict") == 0) |
| 653 | /* Strict in-order semantics */ |
| 654 | nilfs_set_opt(sbi, STRICT_ORDER); |
| 655 | else |
| 656 | return 0; |
| 657 | break; |
| 658 | case Opt_err_panic: |
| 659 | nilfs_write_opt(sbi, ERROR_MODE, ERRORS_PANIC); |
| 660 | break; |
| 661 | case Opt_err_ro: |
| 662 | nilfs_write_opt(sbi, ERROR_MODE, ERRORS_RO); |
| 663 | break; |
| 664 | case Opt_err_cont: |
| 665 | nilfs_write_opt(sbi, ERROR_MODE, ERRORS_CONT); |
| 666 | break; |
| 667 | case Opt_snapshot: |
| 668 | if (match_int(&args[0], &option) || option <= 0) |
| 669 | return 0; |
| 670 | if (!(sb->s_flags & MS_RDONLY)) |
| 671 | return 0; |
| 672 | sbi->s_snapshot_cno = option; |
| 673 | nilfs_set_opt(sbi, SNAPSHOT); |
| 674 | break; |
| 675 | default: |
| 676 | printk(KERN_ERR |
| 677 | "NILFS: Unrecognized mount option \"%s\"\n", p); |
| 678 | return 0; |
| 679 | } |
| 680 | } |
| 681 | return 1; |
| 682 | } |
| 683 | |
| 684 | static inline void |
| 685 | nilfs_set_default_options(struct nilfs_sb_info *sbi, |
| 686 | struct nilfs_super_block *sbp) |
| 687 | { |
| 688 | sbi->s_mount_opt = |
| 689 | NILFS_MOUNT_ERRORS_CONT | NILFS_MOUNT_BARRIER; |
| 690 | } |
| 691 | |
| 692 | static int nilfs_setup_super(struct nilfs_sb_info *sbi) |
| 693 | { |
| 694 | struct the_nilfs *nilfs = sbi->s_nilfs; |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 695 | struct nilfs_super_block *sbp = nilfs->ns_sbp[0]; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 696 | int max_mnt_count = le16_to_cpu(sbp->s_max_mnt_count); |
| 697 | int mnt_count = le16_to_cpu(sbp->s_mnt_count); |
| 698 | |
| 699 | /* nilfs->sem must be locked by the caller. */ |
| 700 | if (!(nilfs->ns_mount_state & NILFS_VALID_FS)) { |
| 701 | printk(KERN_WARNING "NILFS warning: mounting unchecked fs\n"); |
| 702 | } else if (nilfs->ns_mount_state & NILFS_ERROR_FS) { |
| 703 | printk(KERN_WARNING |
| 704 | "NILFS warning: mounting fs with errors\n"); |
| 705 | #if 0 |
| 706 | } else if (max_mnt_count >= 0 && mnt_count >= max_mnt_count) { |
| 707 | printk(KERN_WARNING |
| 708 | "NILFS warning: maximal mount count reached\n"); |
| 709 | #endif |
| 710 | } |
| 711 | if (!max_mnt_count) |
| 712 | sbp->s_max_mnt_count = cpu_to_le16(NILFS_DFL_MAX_MNT_COUNT); |
| 713 | |
| 714 | sbp->s_mnt_count = cpu_to_le16(mnt_count + 1); |
| 715 | sbp->s_state = cpu_to_le16(le16_to_cpu(sbp->s_state) & ~NILFS_VALID_FS); |
| 716 | sbp->s_mtime = cpu_to_le64(get_seconds()); |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 717 | return nilfs_commit_super(sbi, 1); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 718 | } |
| 719 | |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 720 | struct nilfs_super_block *nilfs_read_super_block(struct super_block *sb, |
| 721 | u64 pos, int blocksize, |
| 722 | struct buffer_head **pbh) |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 723 | { |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 724 | unsigned long long sb_index = pos; |
| 725 | unsigned long offset; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 726 | |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 727 | offset = do_div(sb_index, blocksize); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 728 | *pbh = sb_bread(sb, sb_index); |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 729 | if (!*pbh) |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 730 | return NULL; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 731 | return (struct nilfs_super_block *)((char *)(*pbh)->b_data + offset); |
| 732 | } |
| 733 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 734 | int nilfs_store_magic_and_option(struct super_block *sb, |
| 735 | struct nilfs_super_block *sbp, |
| 736 | char *data) |
| 737 | { |
| 738 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
| 739 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 740 | sb->s_magic = le16_to_cpu(sbp->s_magic); |
| 741 | |
| 742 | /* FS independent flags */ |
| 743 | #ifdef NILFS_ATIME_DISABLE |
| 744 | sb->s_flags |= MS_NOATIME; |
| 745 | #endif |
| 746 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 747 | nilfs_set_default_options(sbi, sbp); |
| 748 | |
| 749 | sbi->s_resuid = le16_to_cpu(sbp->s_def_resuid); |
| 750 | sbi->s_resgid = le16_to_cpu(sbp->s_def_resgid); |
| 751 | sbi->s_interval = le32_to_cpu(sbp->s_c_interval); |
| 752 | sbi->s_watermark = le32_to_cpu(sbp->s_c_block_max); |
| 753 | |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 754 | return !parse_options(data, sb) ? -EINVAL : 0 ; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 755 | } |
| 756 | |
| 757 | /** |
| 758 | * nilfs_fill_super() - initialize a super block instance |
| 759 | * @sb: super_block |
| 760 | * @data: mount options |
| 761 | * @silent: silent mode flag |
| 762 | * @nilfs: the_nilfs struct |
| 763 | * |
Ryusuke Konishi | aa7dfb8 | 2009-06-08 01:39:33 +0900 | [diff] [blame] | 764 | * This function is called exclusively by nilfs->ns_mount_mutex. |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 765 | * So, the recovery process is protected from other simultaneous mounts. |
| 766 | */ |
| 767 | static int |
| 768 | nilfs_fill_super(struct super_block *sb, void *data, int silent, |
| 769 | struct the_nilfs *nilfs) |
| 770 | { |
| 771 | struct nilfs_sb_info *sbi; |
| 772 | struct inode *root; |
| 773 | __u64 cno; |
| 774 | int err; |
| 775 | |
| 776 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); |
| 777 | if (!sbi) |
| 778 | return -ENOMEM; |
| 779 | |
| 780 | sb->s_fs_info = sbi; |
| 781 | |
| 782 | get_nilfs(nilfs); |
| 783 | sbi->s_nilfs = nilfs; |
| 784 | sbi->s_super = sb; |
Ryusuke Konishi | 6dd4740 | 2009-06-08 01:39:31 +0900 | [diff] [blame] | 785 | atomic_set(&sbi->s_count, 1); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 786 | |
| 787 | err = init_nilfs(nilfs, sbi, (char *)data); |
| 788 | if (err) |
| 789 | goto failed_sbi; |
| 790 | |
| 791 | spin_lock_init(&sbi->s_inode_lock); |
| 792 | INIT_LIST_HEAD(&sbi->s_dirty_files); |
| 793 | INIT_LIST_HEAD(&sbi->s_list); |
| 794 | |
| 795 | /* |
| 796 | * Following initialization is overlapped because |
| 797 | * nilfs_sb_info structure has been cleared at the beginning. |
| 798 | * But we reserve them to keep our interest and make ready |
| 799 | * for the future change. |
| 800 | */ |
| 801 | get_random_bytes(&sbi->s_next_generation, |
| 802 | sizeof(sbi->s_next_generation)); |
| 803 | spin_lock_init(&sbi->s_next_gen_lock); |
| 804 | |
| 805 | sb->s_op = &nilfs_sops; |
| 806 | sb->s_export_op = &nilfs_export_ops; |
| 807 | sb->s_root = NULL; |
Ryusuke Konishi | 6123923 | 2009-04-06 19:02:00 -0700 | [diff] [blame] | 808 | sb->s_time_gran = 1; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 809 | |
| 810 | if (!nilfs_loaded(nilfs)) { |
| 811 | err = load_nilfs(nilfs, sbi); |
| 812 | if (err) |
| 813 | goto failed_sbi; |
| 814 | } |
| 815 | cno = nilfs_last_cno(nilfs); |
| 816 | |
| 817 | if (sb->s_flags & MS_RDONLY) { |
| 818 | if (nilfs_test_opt(sbi, SNAPSHOT)) { |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 819 | err = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile, |
| 820 | sbi->s_snapshot_cno); |
| 821 | if (err < 0) |
| 822 | goto failed_sbi; |
| 823 | if (!err) { |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 824 | printk(KERN_ERR |
| 825 | "NILFS: The specified checkpoint is " |
| 826 | "not a snapshot " |
| 827 | "(checkpoint number=%llu).\n", |
| 828 | (unsigned long long)sbi->s_snapshot_cno); |
| 829 | err = -EINVAL; |
| 830 | goto failed_sbi; |
| 831 | } |
| 832 | cno = sbi->s_snapshot_cno; |
| 833 | } else |
| 834 | /* Read-only mount */ |
| 835 | sbi->s_snapshot_cno = cno; |
| 836 | } |
| 837 | |
| 838 | err = nilfs_attach_checkpoint(sbi, cno); |
| 839 | if (err) { |
| 840 | printk(KERN_ERR "NILFS: error loading a checkpoint" |
| 841 | " (checkpoint number=%llu).\n", (unsigned long long)cno); |
| 842 | goto failed_sbi; |
| 843 | } |
| 844 | |
| 845 | if (!(sb->s_flags & MS_RDONLY)) { |
Ryusuke Konishi | cece552 | 2009-04-06 19:01:58 -0700 | [diff] [blame] | 846 | err = nilfs_attach_segment_constructor(sbi); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 847 | if (err) |
| 848 | goto failed_checkpoint; |
| 849 | } |
| 850 | |
| 851 | root = nilfs_iget(sb, NILFS_ROOT_INO); |
| 852 | if (IS_ERR(root)) { |
| 853 | printk(KERN_ERR "NILFS: get root inode failed\n"); |
| 854 | err = PTR_ERR(root); |
| 855 | goto failed_segctor; |
| 856 | } |
| 857 | if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { |
| 858 | iput(root); |
| 859 | printk(KERN_ERR "NILFS: corrupt root inode.\n"); |
| 860 | err = -EINVAL; |
| 861 | goto failed_segctor; |
| 862 | } |
| 863 | sb->s_root = d_alloc_root(root); |
| 864 | if (!sb->s_root) { |
| 865 | iput(root); |
| 866 | printk(KERN_ERR "NILFS: get root dentry failed\n"); |
| 867 | err = -ENOMEM; |
| 868 | goto failed_segctor; |
| 869 | } |
| 870 | |
| 871 | if (!(sb->s_flags & MS_RDONLY)) { |
| 872 | down_write(&nilfs->ns_sem); |
| 873 | nilfs_setup_super(sbi); |
| 874 | up_write(&nilfs->ns_sem); |
| 875 | } |
| 876 | |
| 877 | err = nilfs_mark_recovery_complete(sbi); |
| 878 | if (unlikely(err)) { |
| 879 | printk(KERN_ERR "NILFS: recovery failed.\n"); |
| 880 | goto failed_root; |
| 881 | } |
| 882 | |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 883 | down_write(&nilfs->ns_super_sem); |
Ryusuke Konishi | 3f82ff5 | 2009-06-08 01:39:30 +0900 | [diff] [blame] | 884 | if (!nilfs_test_opt(sbi, SNAPSHOT)) |
| 885 | nilfs->ns_current = sbi; |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 886 | up_write(&nilfs->ns_super_sem); |
Ryusuke Konishi | 3f82ff5 | 2009-06-08 01:39:30 +0900 | [diff] [blame] | 887 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 888 | return 0; |
| 889 | |
| 890 | failed_root: |
| 891 | dput(sb->s_root); |
| 892 | sb->s_root = NULL; |
| 893 | |
| 894 | failed_segctor: |
| 895 | nilfs_detach_segment_constructor(sbi); |
| 896 | |
| 897 | failed_checkpoint: |
| 898 | nilfs_detach_checkpoint(sbi); |
| 899 | |
| 900 | failed_sbi: |
| 901 | put_nilfs(nilfs); |
| 902 | sb->s_fs_info = NULL; |
Ryusuke Konishi | 6dd4740 | 2009-06-08 01:39:31 +0900 | [diff] [blame] | 903 | nilfs_put_sbinfo(sbi); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 904 | return err; |
| 905 | } |
| 906 | |
| 907 | static int nilfs_remount(struct super_block *sb, int *flags, char *data) |
| 908 | { |
| 909 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
| 910 | struct nilfs_super_block *sbp; |
| 911 | struct the_nilfs *nilfs = sbi->s_nilfs; |
| 912 | unsigned long old_sb_flags; |
| 913 | struct nilfs_mount_options old_opts; |
| 914 | int err; |
| 915 | |
Alessio Igor Bogani | 337eb00 | 2009-05-12 15:10:54 +0200 | [diff] [blame] | 916 | lock_kernel(); |
| 917 | |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 918 | down_write(&nilfs->ns_super_sem); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 919 | old_sb_flags = sb->s_flags; |
| 920 | old_opts.mount_opt = sbi->s_mount_opt; |
| 921 | old_opts.snapshot_cno = sbi->s_snapshot_cno; |
| 922 | |
| 923 | if (!parse_options(data, sb)) { |
| 924 | err = -EINVAL; |
| 925 | goto restore_opts; |
| 926 | } |
| 927 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL); |
| 928 | |
| 929 | if ((*flags & MS_RDONLY) && |
| 930 | sbi->s_snapshot_cno != old_opts.snapshot_cno) { |
| 931 | printk(KERN_WARNING "NILFS (device %s): couldn't " |
| 932 | "remount to a different snapshot. \n", |
| 933 | sb->s_id); |
| 934 | err = -EINVAL; |
| 935 | goto restore_opts; |
| 936 | } |
| 937 | |
| 938 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
| 939 | goto out; |
| 940 | if (*flags & MS_RDONLY) { |
| 941 | /* Shutting down the segment constructor */ |
| 942 | nilfs_detach_segment_constructor(sbi); |
| 943 | sb->s_flags |= MS_RDONLY; |
| 944 | |
| 945 | sbi->s_snapshot_cno = nilfs_last_cno(nilfs); |
| 946 | /* nilfs_set_opt(sbi, SNAPSHOT); */ |
| 947 | |
| 948 | /* |
| 949 | * Remounting a valid RW partition RDONLY, so set |
| 950 | * the RDONLY flag and then mark the partition as valid again. |
| 951 | */ |
| 952 | down_write(&nilfs->ns_sem); |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 953 | sbp = nilfs->ns_sbp[0]; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 954 | if (!(sbp->s_state & le16_to_cpu(NILFS_VALID_FS)) && |
| 955 | (nilfs->ns_mount_state & NILFS_VALID_FS)) |
| 956 | sbp->s_state = cpu_to_le16(nilfs->ns_mount_state); |
| 957 | sbp->s_mtime = cpu_to_le64(get_seconds()); |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 958 | nilfs_commit_super(sbi, 1); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 959 | up_write(&nilfs->ns_sem); |
| 960 | } else { |
| 961 | /* |
| 962 | * Mounting a RDONLY partition read-write, so reread and |
| 963 | * store the current valid flag. (It may have been changed |
| 964 | * by fsck since we originally mounted the partition.) |
| 965 | */ |
Ryusuke Konishi | 3f82ff5 | 2009-06-08 01:39:30 +0900 | [diff] [blame] | 966 | if (nilfs->ns_current && nilfs->ns_current != sbi) { |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 967 | printk(KERN_WARNING "NILFS (device %s): couldn't " |
Ryusuke Konishi | 3f82ff5 | 2009-06-08 01:39:30 +0900 | [diff] [blame] | 968 | "remount because an RW-mount exists.\n", |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 969 | sb->s_id); |
| 970 | err = -EBUSY; |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 971 | goto restore_opts; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 972 | } |
| 973 | if (sbi->s_snapshot_cno != nilfs_last_cno(nilfs)) { |
| 974 | printk(KERN_WARNING "NILFS (device %s): couldn't " |
| 975 | "remount because the current RO-mount is not " |
| 976 | "the latest one.\n", |
| 977 | sb->s_id); |
| 978 | err = -EINVAL; |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 979 | goto restore_opts; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 980 | } |
| 981 | sb->s_flags &= ~MS_RDONLY; |
| 982 | nilfs_clear_opt(sbi, SNAPSHOT); |
| 983 | sbi->s_snapshot_cno = 0; |
| 984 | |
Ryusuke Konishi | cece552 | 2009-04-06 19:01:58 -0700 | [diff] [blame] | 985 | err = nilfs_attach_segment_constructor(sbi); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 986 | if (err) |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 987 | goto restore_opts; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 988 | |
| 989 | down_write(&nilfs->ns_sem); |
| 990 | nilfs_setup_super(sbi); |
| 991 | up_write(&nilfs->ns_sem); |
| 992 | |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 993 | nilfs->ns_current = sbi; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 994 | } |
| 995 | out: |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 996 | up_write(&nilfs->ns_super_sem); |
Alessio Igor Bogani | 337eb00 | 2009-05-12 15:10:54 +0200 | [diff] [blame] | 997 | unlock_kernel(); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 998 | return 0; |
| 999 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1000 | restore_opts: |
| 1001 | sb->s_flags = old_sb_flags; |
| 1002 | sbi->s_mount_opt = old_opts.mount_opt; |
| 1003 | sbi->s_snapshot_cno = old_opts.snapshot_cno; |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 1004 | up_write(&nilfs->ns_super_sem); |
Alessio Igor Bogani | 337eb00 | 2009-05-12 15:10:54 +0200 | [diff] [blame] | 1005 | unlock_kernel(); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1006 | return err; |
| 1007 | } |
| 1008 | |
| 1009 | struct nilfs_super_data { |
| 1010 | struct block_device *bdev; |
Ryusuke Konishi | 6dd4740 | 2009-06-08 01:39:31 +0900 | [diff] [blame] | 1011 | struct nilfs_sb_info *sbi; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1012 | __u64 cno; |
| 1013 | int flags; |
| 1014 | }; |
| 1015 | |
| 1016 | /** |
| 1017 | * nilfs_identify - pre-read mount options needed to identify mount instance |
| 1018 | * @data: mount options |
| 1019 | * @sd: nilfs_super_data |
| 1020 | */ |
| 1021 | static int nilfs_identify(char *data, struct nilfs_super_data *sd) |
| 1022 | { |
| 1023 | char *p, *options = data; |
| 1024 | substring_t args[MAX_OPT_ARGS]; |
| 1025 | int option, token; |
| 1026 | int ret = 0; |
| 1027 | |
| 1028 | do { |
| 1029 | p = strsep(&options, ","); |
| 1030 | if (p != NULL && *p) { |
| 1031 | token = match_token(p, tokens, args); |
| 1032 | if (token == Opt_snapshot) { |
| 1033 | if (!(sd->flags & MS_RDONLY)) |
| 1034 | ret++; |
| 1035 | else { |
| 1036 | ret = match_int(&args[0], &option); |
| 1037 | if (!ret) { |
| 1038 | if (option > 0) |
| 1039 | sd->cno = option; |
| 1040 | else |
| 1041 | ret++; |
| 1042 | } |
| 1043 | } |
| 1044 | } |
| 1045 | if (ret) |
| 1046 | printk(KERN_ERR |
| 1047 | "NILFS: invalid mount option: %s\n", p); |
| 1048 | } |
| 1049 | if (!options) |
| 1050 | break; |
| 1051 | BUG_ON(options == data); |
| 1052 | *(options - 1) = ','; |
| 1053 | } while (!ret); |
| 1054 | return ret; |
| 1055 | } |
| 1056 | |
| 1057 | static int nilfs_set_bdev_super(struct super_block *s, void *data) |
| 1058 | { |
| 1059 | struct nilfs_super_data *sd = data; |
| 1060 | |
| 1061 | s->s_bdev = sd->bdev; |
| 1062 | s->s_dev = s->s_bdev->bd_dev; |
| 1063 | return 0; |
| 1064 | } |
| 1065 | |
| 1066 | static int nilfs_test_bdev_super(struct super_block *s, void *data) |
| 1067 | { |
| 1068 | struct nilfs_super_data *sd = data; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1069 | |
Ryusuke Konishi | 6dd4740 | 2009-06-08 01:39:31 +0900 | [diff] [blame] | 1070 | return sd->sbi && s->s_fs_info == (void *)sd->sbi; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1071 | } |
| 1072 | |
| 1073 | static int |
| 1074 | nilfs_get_sb(struct file_system_type *fs_type, int flags, |
| 1075 | const char *dev_name, void *data, struct vfsmount *mnt) |
| 1076 | { |
| 1077 | struct nilfs_super_data sd; |
Ryusuke Konishi | 33c8e57 | 2009-06-08 01:39:29 +0900 | [diff] [blame] | 1078 | struct super_block *s; |
| 1079 | struct the_nilfs *nilfs; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1080 | int err, need_to_close = 1; |
| 1081 | |
| 1082 | sd.bdev = open_bdev_exclusive(dev_name, flags, fs_type); |
| 1083 | if (IS_ERR(sd.bdev)) |
| 1084 | return PTR_ERR(sd.bdev); |
| 1085 | |
| 1086 | /* |
| 1087 | * To get mount instance using sget() vfs-routine, NILFS needs |
| 1088 | * much more information than normal filesystems to identify mount |
| 1089 | * instance. For snapshot mounts, not only a mount type (ro-mount |
| 1090 | * or rw-mount) but also a checkpoint number is required. |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1091 | */ |
| 1092 | sd.cno = 0; |
| 1093 | sd.flags = flags; |
| 1094 | if (nilfs_identify((char *)data, &sd)) { |
| 1095 | err = -EINVAL; |
| 1096 | goto failed; |
| 1097 | } |
| 1098 | |
Ryusuke Konishi | 33c8e57 | 2009-06-08 01:39:29 +0900 | [diff] [blame] | 1099 | nilfs = find_or_create_nilfs(sd.bdev); |
| 1100 | if (!nilfs) { |
| 1101 | err = -ENOMEM; |
| 1102 | goto failed; |
| 1103 | } |
| 1104 | |
Ryusuke Konishi | aa7dfb8 | 2009-06-08 01:39:33 +0900 | [diff] [blame] | 1105 | mutex_lock(&nilfs->ns_mount_mutex); |
Ryusuke Konishi | 3f82ff5 | 2009-06-08 01:39:30 +0900 | [diff] [blame] | 1106 | |
| 1107 | if (!sd.cno) { |
| 1108 | /* |
| 1109 | * Check if an exclusive mount exists or not. |
| 1110 | * Snapshot mounts coexist with a current mount |
| 1111 | * (i.e. rw-mount or ro-mount), whereas rw-mount and |
| 1112 | * ro-mount are mutually exclusive. |
| 1113 | */ |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 1114 | down_read(&nilfs->ns_super_sem); |
Ryusuke Konishi | 3f82ff5 | 2009-06-08 01:39:30 +0900 | [diff] [blame] | 1115 | if (nilfs->ns_current && |
| 1116 | ((nilfs->ns_current->s_super->s_flags ^ flags) |
| 1117 | & MS_RDONLY)) { |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 1118 | up_read(&nilfs->ns_super_sem); |
Ryusuke Konishi | 3f82ff5 | 2009-06-08 01:39:30 +0900 | [diff] [blame] | 1119 | err = -EBUSY; |
| 1120 | goto failed_unlock; |
| 1121 | } |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 1122 | up_read(&nilfs->ns_super_sem); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1123 | } |
| 1124 | |
| 1125 | /* |
Ryusuke Konishi | 6dd4740 | 2009-06-08 01:39:31 +0900 | [diff] [blame] | 1126 | * Find existing nilfs_sb_info struct |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1127 | */ |
Ryusuke Konishi | 6dd4740 | 2009-06-08 01:39:31 +0900 | [diff] [blame] | 1128 | sd.sbi = nilfs_find_sbinfo(nilfs, !(flags & MS_RDONLY), sd.cno); |
| 1129 | |
Ryusuke Konishi | 33c8e57 | 2009-06-08 01:39:29 +0900 | [diff] [blame] | 1130 | if (!sd.cno) |
| 1131 | /* trying to get the latest checkpoint. */ |
| 1132 | sd.cno = nilfs_last_cno(nilfs); |
| 1133 | |
Ryusuke Konishi | 6dd4740 | 2009-06-08 01:39:31 +0900 | [diff] [blame] | 1134 | /* |
| 1135 | * Get super block instance holding the nilfs_sb_info struct. |
| 1136 | * A new instance is allocated if no existing mount is present or |
| 1137 | * existing instance has been unmounted. |
| 1138 | */ |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1139 | s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, &sd); |
Ryusuke Konishi | 6dd4740 | 2009-06-08 01:39:31 +0900 | [diff] [blame] | 1140 | if (sd.sbi) |
| 1141 | nilfs_put_sbinfo(sd.sbi); |
| 1142 | |
Ryusuke Konishi | 33c8e57 | 2009-06-08 01:39:29 +0900 | [diff] [blame] | 1143 | if (IS_ERR(s)) { |
| 1144 | err = PTR_ERR(s); |
| 1145 | goto failed_unlock; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1146 | } |
| 1147 | |
| 1148 | if (!s->s_root) { |
| 1149 | char b[BDEVNAME_SIZE]; |
| 1150 | |
Ryusuke Konishi | 33c8e57 | 2009-06-08 01:39:29 +0900 | [diff] [blame] | 1151 | /* New superblock instance created */ |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1152 | s->s_flags = flags; |
| 1153 | strlcpy(s->s_id, bdevname(sd.bdev, b), sizeof(s->s_id)); |
| 1154 | sb_set_blocksize(s, block_size(sd.bdev)); |
| 1155 | |
| 1156 | err = nilfs_fill_super(s, data, flags & MS_VERBOSE, nilfs); |
| 1157 | if (err) |
| 1158 | goto cancel_new; |
| 1159 | |
| 1160 | s->s_flags |= MS_ACTIVE; |
| 1161 | need_to_close = 0; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1162 | } |
| 1163 | |
Ryusuke Konishi | aa7dfb8 | 2009-06-08 01:39:33 +0900 | [diff] [blame] | 1164 | mutex_unlock(&nilfs->ns_mount_mutex); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1165 | put_nilfs(nilfs); |
| 1166 | if (need_to_close) |
| 1167 | close_bdev_exclusive(sd.bdev, flags); |
| 1168 | simple_set_mnt(mnt, s); |
| 1169 | return 0; |
| 1170 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1171 | failed_unlock: |
Ryusuke Konishi | aa7dfb8 | 2009-06-08 01:39:33 +0900 | [diff] [blame] | 1172 | mutex_unlock(&nilfs->ns_mount_mutex); |
Ryusuke Konishi | 33c8e57 | 2009-06-08 01:39:29 +0900 | [diff] [blame] | 1173 | put_nilfs(nilfs); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1174 | failed: |
| 1175 | close_bdev_exclusive(sd.bdev, flags); |
| 1176 | |
| 1177 | return err; |
| 1178 | |
| 1179 | cancel_new: |
| 1180 | /* Abandoning the newly allocated superblock */ |
Ryusuke Konishi | aa7dfb8 | 2009-06-08 01:39:33 +0900 | [diff] [blame] | 1181 | mutex_unlock(&nilfs->ns_mount_mutex); |
Ryusuke Konishi | 33c8e57 | 2009-06-08 01:39:29 +0900 | [diff] [blame] | 1182 | put_nilfs(nilfs); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1183 | up_write(&s->s_umount); |
| 1184 | deactivate_super(s); |
| 1185 | /* |
| 1186 | * deactivate_super() invokes close_bdev_exclusive(). |
| 1187 | * We must finish all post-cleaning before this call; |
Ryusuke Konishi | aa7dfb8 | 2009-06-08 01:39:33 +0900 | [diff] [blame] | 1188 | * put_nilfs() needs the block device. |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1189 | */ |
| 1190 | return err; |
| 1191 | } |
| 1192 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1193 | struct file_system_type nilfs_fs_type = { |
| 1194 | .owner = THIS_MODULE, |
| 1195 | .name = "nilfs2", |
| 1196 | .get_sb = nilfs_get_sb, |
| 1197 | .kill_sb = kill_block_super, |
| 1198 | .fs_flags = FS_REQUIRES_DEV, |
| 1199 | }; |
| 1200 | |
| 1201 | static int __init init_nilfs_fs(void) |
| 1202 | { |
| 1203 | int err; |
| 1204 | |
| 1205 | err = nilfs_init_inode_cache(); |
| 1206 | if (err) |
| 1207 | goto failed; |
| 1208 | |
| 1209 | err = nilfs_init_transaction_cache(); |
| 1210 | if (err) |
| 1211 | goto failed_inode_cache; |
| 1212 | |
| 1213 | err = nilfs_init_segbuf_cache(); |
| 1214 | if (err) |
| 1215 | goto failed_transaction_cache; |
| 1216 | |
| 1217 | err = nilfs_btree_path_cache_init(); |
| 1218 | if (err) |
| 1219 | goto failed_segbuf_cache; |
| 1220 | |
| 1221 | err = register_filesystem(&nilfs_fs_type); |
| 1222 | if (err) |
| 1223 | goto failed_btree_path_cache; |
| 1224 | |
| 1225 | return 0; |
| 1226 | |
| 1227 | failed_btree_path_cache: |
| 1228 | nilfs_btree_path_cache_destroy(); |
| 1229 | |
| 1230 | failed_segbuf_cache: |
| 1231 | nilfs_destroy_segbuf_cache(); |
| 1232 | |
| 1233 | failed_transaction_cache: |
| 1234 | nilfs_destroy_transaction_cache(); |
| 1235 | |
| 1236 | failed_inode_cache: |
| 1237 | nilfs_destroy_inode_cache(); |
| 1238 | |
| 1239 | failed: |
| 1240 | return err; |
| 1241 | } |
| 1242 | |
| 1243 | static void __exit exit_nilfs_fs(void) |
| 1244 | { |
| 1245 | nilfs_destroy_segbuf_cache(); |
| 1246 | nilfs_destroy_transaction_cache(); |
| 1247 | nilfs_destroy_inode_cache(); |
| 1248 | nilfs_btree_path_cache_destroy(); |
| 1249 | unregister_filesystem(&nilfs_fs_type); |
| 1250 | } |
| 1251 | |
| 1252 | module_init(init_nilfs_fs) |
| 1253 | module_exit(exit_nilfs_fs) |