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> |
Jiro SEKIBA | b58a285 | 2009-06-24 20:06:34 +0900 | [diff] [blame] | 53 | #include <linux/seq_file.h> |
| 54 | #include <linux/mount.h> |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 55 | #include "nilfs.h" |
| 56 | #include "mdt.h" |
| 57 | #include "alloc.h" |
| 58 | #include "page.h" |
| 59 | #include "cpfile.h" |
| 60 | #include "ifile.h" |
| 61 | #include "dat.h" |
| 62 | #include "segment.h" |
| 63 | #include "segbuf.h" |
| 64 | |
| 65 | MODULE_AUTHOR("NTT Corp."); |
| 66 | MODULE_DESCRIPTION("A New Implementation of the Log-structured Filesystem " |
| 67 | "(NILFS)"); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 68 | MODULE_LICENSE("GPL"); |
| 69 | |
| 70 | static int nilfs_remount(struct super_block *sb, int *flags, char *data); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 71 | |
| 72 | /** |
| 73 | * nilfs_error() - report failure condition on a filesystem |
| 74 | * |
| 75 | * nilfs_error() sets an ERROR_FS flag on the superblock as well as |
| 76 | * reporting an error message. It should be called when NILFS detects |
| 77 | * incoherences or defects of meta data on disk. As for sustainable |
| 78 | * errors such as a single-shot I/O error, nilfs_warning() or the printk() |
| 79 | * function should be used instead. |
| 80 | * |
| 81 | * The segment constructor must not call this function because it can |
| 82 | * kill itself. |
| 83 | */ |
| 84 | void nilfs_error(struct super_block *sb, const char *function, |
| 85 | const char *fmt, ...) |
| 86 | { |
| 87 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
| 88 | va_list args; |
| 89 | |
| 90 | va_start(args, fmt); |
| 91 | printk(KERN_CRIT "NILFS error (device %s): %s: ", sb->s_id, function); |
| 92 | vprintk(fmt, args); |
| 93 | printk("\n"); |
| 94 | va_end(args); |
| 95 | |
| 96 | if (!(sb->s_flags & MS_RDONLY)) { |
| 97 | struct the_nilfs *nilfs = sbi->s_nilfs; |
| 98 | |
| 99 | if (!nilfs_test_opt(sbi, ERRORS_CONT)) |
| 100 | nilfs_detach_segment_constructor(sbi); |
| 101 | |
| 102 | down_write(&nilfs->ns_sem); |
| 103 | if (!(nilfs->ns_mount_state & NILFS_ERROR_FS)) { |
| 104 | nilfs->ns_mount_state |= NILFS_ERROR_FS; |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 105 | nilfs->ns_sbp[0]->s_state |= |
| 106 | cpu_to_le16(NILFS_ERROR_FS); |
| 107 | nilfs_commit_super(sbi, 1); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 108 | } |
| 109 | up_write(&nilfs->ns_sem); |
| 110 | |
| 111 | if (nilfs_test_opt(sbi, ERRORS_RO)) { |
| 112 | printk(KERN_CRIT "Remounting filesystem read-only\n"); |
| 113 | sb->s_flags |= MS_RDONLY; |
| 114 | } |
| 115 | } |
| 116 | |
| 117 | if (nilfs_test_opt(sbi, ERRORS_PANIC)) |
| 118 | panic("NILFS (device %s): panic forced after error\n", |
| 119 | sb->s_id); |
| 120 | } |
| 121 | |
| 122 | void nilfs_warning(struct super_block *sb, const char *function, |
| 123 | const char *fmt, ...) |
| 124 | { |
| 125 | va_list args; |
| 126 | |
| 127 | va_start(args, fmt); |
| 128 | printk(KERN_WARNING "NILFS warning (device %s): %s: ", |
| 129 | sb->s_id, function); |
| 130 | vprintk(fmt, args); |
| 131 | printk("\n"); |
| 132 | va_end(args); |
| 133 | } |
| 134 | |
| 135 | static struct kmem_cache *nilfs_inode_cachep; |
| 136 | |
Ryusuke Konishi | a53b475 | 2009-05-27 22:11:46 +0900 | [diff] [blame] | 137 | struct inode *nilfs_alloc_inode_common(struct the_nilfs *nilfs) |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 138 | { |
| 139 | struct nilfs_inode_info *ii; |
| 140 | |
| 141 | ii = kmem_cache_alloc(nilfs_inode_cachep, GFP_NOFS); |
| 142 | if (!ii) |
| 143 | return NULL; |
| 144 | ii->i_bh = NULL; |
| 145 | ii->i_state = 0; |
| 146 | ii->vfs_inode.i_version = 1; |
Ryusuke Konishi | a53b475 | 2009-05-27 22:11:46 +0900 | [diff] [blame] | 147 | nilfs_btnode_cache_init(&ii->i_btnode_cache, nilfs->ns_bdi); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 148 | return &ii->vfs_inode; |
| 149 | } |
| 150 | |
Ryusuke Konishi | a53b475 | 2009-05-27 22:11:46 +0900 | [diff] [blame] | 151 | struct inode *nilfs_alloc_inode(struct super_block *sb) |
| 152 | { |
| 153 | return nilfs_alloc_inode_common(NILFS_SB(sb)->s_nilfs); |
| 154 | } |
| 155 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 156 | void nilfs_destroy_inode(struct inode *inode) |
| 157 | { |
| 158 | kmem_cache_free(nilfs_inode_cachep, NILFS_I(inode)); |
| 159 | } |
| 160 | |
| 161 | static void init_once(void *obj) |
| 162 | { |
| 163 | struct nilfs_inode_info *ii = obj; |
| 164 | |
| 165 | INIT_LIST_HEAD(&ii->i_dirty); |
| 166 | #ifdef CONFIG_NILFS_XATTR |
| 167 | init_rwsem(&ii->xattr_sem); |
| 168 | #endif |
| 169 | nilfs_btnode_cache_init_once(&ii->i_btnode_cache); |
| 170 | ii->i_bmap = (struct nilfs_bmap *)&ii->i_bmap_union; |
| 171 | inode_init_once(&ii->vfs_inode); |
| 172 | } |
| 173 | |
| 174 | static int nilfs_init_inode_cache(void) |
| 175 | { |
| 176 | nilfs_inode_cachep = kmem_cache_create("nilfs2_inode_cache", |
| 177 | sizeof(struct nilfs_inode_info), |
| 178 | 0, SLAB_RECLAIM_ACCOUNT, |
| 179 | init_once); |
| 180 | |
| 181 | return (nilfs_inode_cachep == NULL) ? -ENOMEM : 0; |
| 182 | } |
| 183 | |
| 184 | static inline void nilfs_destroy_inode_cache(void) |
| 185 | { |
| 186 | kmem_cache_destroy(nilfs_inode_cachep); |
| 187 | } |
| 188 | |
| 189 | static void nilfs_clear_inode(struct inode *inode) |
| 190 | { |
| 191 | struct nilfs_inode_info *ii = NILFS_I(inode); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 192 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 193 | /* |
| 194 | * Free resources allocated in nilfs_read_inode(), here. |
| 195 | */ |
Ryusuke Konishi | a2e7d2d | 2009-04-06 19:01:44 -0700 | [diff] [blame] | 196 | BUG_ON(!list_empty(&ii->i_dirty)); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 197 | brelse(ii->i_bh); |
| 198 | ii->i_bh = NULL; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 199 | |
| 200 | if (test_bit(NILFS_I_BMAP, &ii->i_state)) |
| 201 | nilfs_bmap_clear(ii->i_bmap); |
| 202 | |
| 203 | nilfs_btnode_cache_clear(&ii->i_btnode_cache); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 204 | } |
| 205 | |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 206 | static int nilfs_sync_super(struct nilfs_sb_info *sbi, int dupsb) |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 207 | { |
| 208 | struct the_nilfs *nilfs = sbi->s_nilfs; |
| 209 | int err; |
| 210 | int barrier_done = 0; |
| 211 | |
| 212 | if (nilfs_test_opt(sbi, BARRIER)) { |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 213 | set_buffer_ordered(nilfs->ns_sbh[0]); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 214 | barrier_done = 1; |
| 215 | } |
| 216 | retry: |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 217 | set_buffer_dirty(nilfs->ns_sbh[0]); |
| 218 | err = sync_dirty_buffer(nilfs->ns_sbh[0]); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 219 | if (err == -EOPNOTSUPP && barrier_done) { |
| 220 | nilfs_warning(sbi->s_super, __func__, |
| 221 | "barrier-based sync failed. " |
| 222 | "disabling barriers\n"); |
| 223 | nilfs_clear_opt(sbi, BARRIER); |
| 224 | barrier_done = 0; |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 225 | clear_buffer_ordered(nilfs->ns_sbh[0]); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 226 | goto retry; |
| 227 | } |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 228 | if (unlikely(err)) { |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 229 | printk(KERN_ERR |
| 230 | "NILFS: unable to write superblock (err=%d)\n", err); |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 231 | if (err == -EIO && nilfs->ns_sbh[1]) { |
| 232 | nilfs_fall_back_super_block(nilfs); |
| 233 | goto retry; |
| 234 | } |
| 235 | } else { |
| 236 | struct nilfs_super_block *sbp = nilfs->ns_sbp[0]; |
| 237 | |
| 238 | /* |
| 239 | * The latest segment becomes trailable from the position |
| 240 | * written in superblock. |
| 241 | */ |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 242 | clear_nilfs_discontinued(nilfs); |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 243 | |
| 244 | /* update GC protection for recent segments */ |
| 245 | if (nilfs->ns_sbh[1]) { |
| 246 | sbp = NULL; |
| 247 | if (dupsb) { |
| 248 | set_buffer_dirty(nilfs->ns_sbh[1]); |
| 249 | if (!sync_dirty_buffer(nilfs->ns_sbh[1])) |
| 250 | sbp = nilfs->ns_sbp[1]; |
| 251 | } |
| 252 | } |
| 253 | if (sbp) { |
| 254 | spin_lock(&nilfs->ns_last_segment_lock); |
| 255 | nilfs->ns_prot_seq = le64_to_cpu(sbp->s_last_seq); |
| 256 | spin_unlock(&nilfs->ns_last_segment_lock); |
| 257 | } |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 258 | } |
| 259 | |
| 260 | return err; |
| 261 | } |
| 262 | |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 263 | int nilfs_commit_super(struct nilfs_sb_info *sbi, int dupsb) |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 264 | { |
| 265 | struct the_nilfs *nilfs = sbi->s_nilfs; |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 266 | struct nilfs_super_block **sbp = nilfs->ns_sbp; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 267 | sector_t nfreeblocks; |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 268 | time_t t; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 269 | int err; |
| 270 | |
| 271 | /* nilfs->sem must be locked by the caller. */ |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 272 | if (sbp[0]->s_magic != NILFS_SUPER_MAGIC) { |
| 273 | if (sbp[1] && sbp[1]->s_magic == NILFS_SUPER_MAGIC) |
| 274 | nilfs_swap_super_block(nilfs); |
| 275 | else { |
| 276 | printk(KERN_CRIT "NILFS: superblock broke on dev %s\n", |
| 277 | sbi->s_super->s_id); |
| 278 | return -EIO; |
| 279 | } |
| 280 | } |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 281 | err = nilfs_count_free_blocks(nilfs, &nfreeblocks); |
| 282 | if (unlikely(err)) { |
| 283 | printk(KERN_ERR "NILFS: failed to count free blocks\n"); |
| 284 | return err; |
| 285 | } |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 286 | spin_lock(&nilfs->ns_last_segment_lock); |
| 287 | sbp[0]->s_last_seq = cpu_to_le64(nilfs->ns_last_seq); |
| 288 | sbp[0]->s_last_pseg = cpu_to_le64(nilfs->ns_last_pseg); |
| 289 | sbp[0]->s_last_cno = cpu_to_le64(nilfs->ns_last_cno); |
| 290 | spin_unlock(&nilfs->ns_last_segment_lock); |
| 291 | |
| 292 | t = get_seconds(); |
| 293 | nilfs->ns_sbwtime[0] = t; |
| 294 | sbp[0]->s_free_blocks_count = cpu_to_le64(nfreeblocks); |
| 295 | sbp[0]->s_wtime = cpu_to_le64(t); |
| 296 | sbp[0]->s_sum = 0; |
| 297 | sbp[0]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed, |
| 298 | (unsigned char *)sbp[0], |
| 299 | nilfs->ns_sbsize)); |
| 300 | if (dupsb && sbp[1]) { |
| 301 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); |
| 302 | nilfs->ns_sbwtime[1] = t; |
| 303 | } |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 304 | sbi->s_super->s_dirt = 0; |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 305 | return nilfs_sync_super(sbi, dupsb); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 306 | } |
| 307 | |
| 308 | static void nilfs_put_super(struct super_block *sb) |
| 309 | { |
| 310 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
| 311 | struct the_nilfs *nilfs = sbi->s_nilfs; |
| 312 | |
Christoph Hellwig | 6cfd014 | 2009-05-05 15:40:36 +0200 | [diff] [blame] | 313 | lock_kernel(); |
| 314 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 315 | nilfs_detach_segment_constructor(sbi); |
| 316 | |
| 317 | if (!(sb->s_flags & MS_RDONLY)) { |
| 318 | down_write(&nilfs->ns_sem); |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 319 | nilfs->ns_sbp[0]->s_state = cpu_to_le16(nilfs->ns_mount_state); |
| 320 | nilfs_commit_super(sbi, 1); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 321 | up_write(&nilfs->ns_sem); |
| 322 | } |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 323 | down_write(&nilfs->ns_super_sem); |
Ryusuke Konishi | 3f82ff5 | 2009-06-08 01:39:30 +0900 | [diff] [blame] | 324 | if (nilfs->ns_current == sbi) |
| 325 | nilfs->ns_current = NULL; |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 326 | up_write(&nilfs->ns_super_sem); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 327 | |
| 328 | nilfs_detach_checkpoint(sbi); |
| 329 | put_nilfs(sbi->s_nilfs); |
| 330 | sbi->s_super = NULL; |
| 331 | sb->s_fs_info = NULL; |
Ryusuke Konishi | 6dd4740 | 2009-06-08 01:39:31 +0900 | [diff] [blame] | 332 | nilfs_put_sbinfo(sbi); |
Christoph Hellwig | 6cfd014 | 2009-05-05 15:40:36 +0200 | [diff] [blame] | 333 | |
| 334 | unlock_kernel(); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 335 | } |
| 336 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 337 | static int nilfs_sync_fs(struct super_block *sb, int wait) |
| 338 | { |
Jiro SEKIBA | 6233caa | 2009-07-23 01:26:33 +0900 | [diff] [blame] | 339 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
| 340 | struct the_nilfs *nilfs = sbi->s_nilfs; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 341 | int err = 0; |
| 342 | |
| 343 | /* This function is called when super block should be written back */ |
| 344 | if (wait) |
| 345 | err = nilfs_construct_segment(sb); |
Jiro SEKIBA | 6233caa | 2009-07-23 01:26:33 +0900 | [diff] [blame] | 346 | |
| 347 | down_write(&nilfs->ns_sem); |
| 348 | if (sb->s_dirt) |
| 349 | nilfs_commit_super(sbi, 1); |
| 350 | up_write(&nilfs->ns_sem); |
| 351 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 352 | return err; |
| 353 | } |
| 354 | |
| 355 | int nilfs_attach_checkpoint(struct nilfs_sb_info *sbi, __u64 cno) |
| 356 | { |
| 357 | struct the_nilfs *nilfs = sbi->s_nilfs; |
| 358 | struct nilfs_checkpoint *raw_cp; |
| 359 | struct buffer_head *bh_cp; |
| 360 | int err; |
| 361 | |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 362 | down_write(&nilfs->ns_super_sem); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 363 | list_add(&sbi->s_list, &nilfs->ns_supers); |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 364 | up_write(&nilfs->ns_super_sem); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 365 | |
| 366 | sbi->s_ifile = nilfs_mdt_new( |
| 367 | nilfs, sbi->s_super, NILFS_IFILE_INO, NILFS_IFILE_GFP); |
| 368 | if (!sbi->s_ifile) |
| 369 | return -ENOMEM; |
| 370 | |
| 371 | err = nilfs_palloc_init_blockgroup(sbi->s_ifile, nilfs->ns_inode_size); |
| 372 | if (unlikely(err)) |
| 373 | goto failed; |
| 374 | |
Zhang Qiang | 1154ecb | 2009-08-18 14:58:24 +0800 | [diff] [blame] | 375 | down_read(&nilfs->ns_segctor_sem); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 376 | err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, cno, 0, &raw_cp, |
| 377 | &bh_cp); |
Zhang Qiang | 1154ecb | 2009-08-18 14:58:24 +0800 | [diff] [blame] | 378 | up_read(&nilfs->ns_segctor_sem); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 379 | if (unlikely(err)) { |
| 380 | if (err == -ENOENT || err == -EINVAL) { |
| 381 | printk(KERN_ERR |
| 382 | "NILFS: Invalid checkpoint " |
| 383 | "(checkpoint number=%llu)\n", |
| 384 | (unsigned long long)cno); |
| 385 | err = -EINVAL; |
| 386 | } |
| 387 | goto failed; |
| 388 | } |
| 389 | err = nilfs_read_inode_common(sbi->s_ifile, &raw_cp->cp_ifile_inode); |
| 390 | if (unlikely(err)) |
| 391 | goto failed_bh; |
| 392 | atomic_set(&sbi->s_inodes_count, le64_to_cpu(raw_cp->cp_inodes_count)); |
| 393 | atomic_set(&sbi->s_blocks_count, le64_to_cpu(raw_cp->cp_blocks_count)); |
| 394 | |
| 395 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); |
| 396 | return 0; |
| 397 | |
| 398 | failed_bh: |
| 399 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); |
| 400 | failed: |
| 401 | nilfs_mdt_destroy(sbi->s_ifile); |
| 402 | sbi->s_ifile = NULL; |
| 403 | |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 404 | down_write(&nilfs->ns_super_sem); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 405 | list_del_init(&sbi->s_list); |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 406 | up_write(&nilfs->ns_super_sem); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 407 | |
| 408 | return err; |
| 409 | } |
| 410 | |
| 411 | void nilfs_detach_checkpoint(struct nilfs_sb_info *sbi) |
| 412 | { |
| 413 | struct the_nilfs *nilfs = sbi->s_nilfs; |
| 414 | |
| 415 | nilfs_mdt_clear(sbi->s_ifile); |
| 416 | nilfs_mdt_destroy(sbi->s_ifile); |
| 417 | sbi->s_ifile = NULL; |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 418 | down_write(&nilfs->ns_super_sem); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 419 | list_del_init(&sbi->s_list); |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 420 | up_write(&nilfs->ns_super_sem); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 421 | } |
| 422 | |
| 423 | static int nilfs_mark_recovery_complete(struct nilfs_sb_info *sbi) |
| 424 | { |
| 425 | struct the_nilfs *nilfs = sbi->s_nilfs; |
| 426 | int err = 0; |
| 427 | |
| 428 | down_write(&nilfs->ns_sem); |
| 429 | if (!(nilfs->ns_mount_state & NILFS_VALID_FS)) { |
| 430 | nilfs->ns_mount_state |= NILFS_VALID_FS; |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 431 | err = nilfs_commit_super(sbi, 1); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 432 | if (likely(!err)) |
| 433 | printk(KERN_INFO "NILFS: recovery complete.\n"); |
| 434 | } |
| 435 | up_write(&nilfs->ns_sem); |
| 436 | return err; |
| 437 | } |
| 438 | |
| 439 | static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
| 440 | { |
| 441 | struct super_block *sb = dentry->d_sb; |
| 442 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
Ryusuke Konishi | c306af2 | 2009-03-26 10:16:57 +0900 | [diff] [blame] | 443 | struct the_nilfs *nilfs = sbi->s_nilfs; |
| 444 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 445 | unsigned long long blocks; |
| 446 | unsigned long overhead; |
| 447 | unsigned long nrsvblocks; |
| 448 | sector_t nfreeblocks; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 449 | int err; |
| 450 | |
| 451 | /* |
| 452 | * Compute all of the segment blocks |
| 453 | * |
| 454 | * The blocks before first segment and after last segment |
| 455 | * are excluded. |
| 456 | */ |
| 457 | blocks = nilfs->ns_blocks_per_segment * nilfs->ns_nsegments |
| 458 | - nilfs->ns_first_data_block; |
| 459 | nrsvblocks = nilfs->ns_nrsvsegs * nilfs->ns_blocks_per_segment; |
| 460 | |
| 461 | /* |
| 462 | * Compute the overhead |
| 463 | * |
| 464 | * When distributing meta data blocks outside semgent structure, |
| 465 | * We must count them as the overhead. |
| 466 | */ |
| 467 | overhead = 0; |
| 468 | |
| 469 | err = nilfs_count_free_blocks(nilfs, &nfreeblocks); |
| 470 | if (unlikely(err)) |
| 471 | return err; |
| 472 | |
| 473 | buf->f_type = NILFS_SUPER_MAGIC; |
| 474 | buf->f_bsize = sb->s_blocksize; |
| 475 | buf->f_blocks = blocks - overhead; |
| 476 | buf->f_bfree = nfreeblocks; |
| 477 | buf->f_bavail = (buf->f_bfree >= nrsvblocks) ? |
| 478 | (buf->f_bfree - nrsvblocks) : 0; |
| 479 | buf->f_files = atomic_read(&sbi->s_inodes_count); |
| 480 | buf->f_ffree = 0; /* nilfs_count_free_inodes(sb); */ |
| 481 | buf->f_namelen = NILFS_NAME_LEN; |
Ryusuke Konishi | c306af2 | 2009-03-26 10:16:57 +0900 | [diff] [blame] | 482 | buf->f_fsid.val[0] = (u32)id; |
| 483 | buf->f_fsid.val[1] = (u32)(id >> 32); |
| 484 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 485 | return 0; |
| 486 | } |
| 487 | |
Jiro SEKIBA | b58a285 | 2009-06-24 20:06:34 +0900 | [diff] [blame] | 488 | static int nilfs_show_options(struct seq_file *seq, struct vfsmount *vfs) |
| 489 | { |
| 490 | struct super_block *sb = vfs->mnt_sb; |
| 491 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
| 492 | |
| 493 | if (!nilfs_test_opt(sbi, BARRIER)) |
| 494 | seq_printf(seq, ",barrier=off"); |
| 495 | if (nilfs_test_opt(sbi, SNAPSHOT)) |
| 496 | seq_printf(seq, ",cp=%llu", |
| 497 | (unsigned long long int)sbi->s_snapshot_cno); |
| 498 | if (nilfs_test_opt(sbi, ERRORS_RO)) |
| 499 | seq_printf(seq, ",errors=remount-ro"); |
| 500 | if (nilfs_test_opt(sbi, ERRORS_PANIC)) |
| 501 | seq_printf(seq, ",errors=panic"); |
| 502 | if (nilfs_test_opt(sbi, STRICT_ORDER)) |
| 503 | seq_printf(seq, ",order=strict"); |
| 504 | |
| 505 | return 0; |
| 506 | } |
| 507 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 508 | static struct super_operations nilfs_sops = { |
| 509 | .alloc_inode = nilfs_alloc_inode, |
| 510 | .destroy_inode = nilfs_destroy_inode, |
| 511 | .dirty_inode = nilfs_dirty_inode, |
| 512 | /* .write_inode = nilfs_write_inode, */ |
| 513 | /* .put_inode = nilfs_put_inode, */ |
| 514 | /* .drop_inode = nilfs_drop_inode, */ |
| 515 | .delete_inode = nilfs_delete_inode, |
| 516 | .put_super = nilfs_put_super, |
Jiro SEKIBA | 1dfa271 | 2009-07-23 01:33:49 +0900 | [diff] [blame] | 517 | /* .write_super = nilfs_write_super, */ |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 518 | .sync_fs = nilfs_sync_fs, |
| 519 | /* .write_super_lockfs */ |
| 520 | /* .unlockfs */ |
| 521 | .statfs = nilfs_statfs, |
| 522 | .remount_fs = nilfs_remount, |
| 523 | .clear_inode = nilfs_clear_inode, |
| 524 | /* .umount_begin */ |
Jiro SEKIBA | b58a285 | 2009-06-24 20:06:34 +0900 | [diff] [blame] | 525 | .show_options = nilfs_show_options |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 526 | }; |
| 527 | |
| 528 | static struct inode * |
| 529 | nilfs_nfs_get_inode(struct super_block *sb, u64 ino, u32 generation) |
| 530 | { |
| 531 | struct inode *inode; |
| 532 | |
| 533 | if (ino < NILFS_FIRST_INO(sb) && ino != NILFS_ROOT_INO && |
| 534 | ino != NILFS_SKETCH_INO) |
| 535 | return ERR_PTR(-ESTALE); |
| 536 | |
| 537 | inode = nilfs_iget(sb, ino); |
| 538 | if (IS_ERR(inode)) |
| 539 | return ERR_CAST(inode); |
| 540 | if (generation && inode->i_generation != generation) { |
| 541 | iput(inode); |
| 542 | return ERR_PTR(-ESTALE); |
| 543 | } |
| 544 | |
| 545 | return inode; |
| 546 | } |
| 547 | |
| 548 | static struct dentry * |
| 549 | nilfs_fh_to_dentry(struct super_block *sb, struct fid *fid, int fh_len, |
| 550 | int fh_type) |
| 551 | { |
| 552 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, |
| 553 | nilfs_nfs_get_inode); |
| 554 | } |
| 555 | |
| 556 | static struct dentry * |
| 557 | nilfs_fh_to_parent(struct super_block *sb, struct fid *fid, int fh_len, |
| 558 | int fh_type) |
| 559 | { |
| 560 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, |
| 561 | nilfs_nfs_get_inode); |
| 562 | } |
| 563 | |
| 564 | static struct export_operations nilfs_export_ops = { |
| 565 | .fh_to_dentry = nilfs_fh_to_dentry, |
| 566 | .fh_to_parent = nilfs_fh_to_parent, |
| 567 | .get_parent = nilfs_get_parent, |
| 568 | }; |
| 569 | |
| 570 | enum { |
| 571 | Opt_err_cont, Opt_err_panic, Opt_err_ro, |
| 572 | Opt_barrier, Opt_snapshot, Opt_order, |
| 573 | Opt_err, |
| 574 | }; |
| 575 | |
| 576 | static match_table_t tokens = { |
| 577 | {Opt_err_cont, "errors=continue"}, |
| 578 | {Opt_err_panic, "errors=panic"}, |
| 579 | {Opt_err_ro, "errors=remount-ro"}, |
| 580 | {Opt_barrier, "barrier=%s"}, |
| 581 | {Opt_snapshot, "cp=%u"}, |
| 582 | {Opt_order, "order=%s"}, |
| 583 | {Opt_err, NULL} |
| 584 | }; |
| 585 | |
| 586 | static int match_bool(substring_t *s, int *result) |
| 587 | { |
| 588 | int len = s->to - s->from; |
| 589 | |
| 590 | if (strncmp(s->from, "on", len) == 0) |
| 591 | *result = 1; |
| 592 | else if (strncmp(s->from, "off", len) == 0) |
| 593 | *result = 0; |
| 594 | else |
| 595 | return 1; |
| 596 | return 0; |
| 597 | } |
| 598 | |
| 599 | static int parse_options(char *options, struct super_block *sb) |
| 600 | { |
| 601 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
| 602 | char *p; |
| 603 | substring_t args[MAX_OPT_ARGS]; |
| 604 | int option; |
| 605 | |
| 606 | if (!options) |
| 607 | return 1; |
| 608 | |
| 609 | while ((p = strsep(&options, ",")) != NULL) { |
| 610 | int token; |
| 611 | if (!*p) |
| 612 | continue; |
| 613 | |
| 614 | token = match_token(p, tokens, args); |
| 615 | switch (token) { |
| 616 | case Opt_barrier: |
| 617 | if (match_bool(&args[0], &option)) |
| 618 | return 0; |
| 619 | if (option) |
| 620 | nilfs_set_opt(sbi, BARRIER); |
| 621 | else |
| 622 | nilfs_clear_opt(sbi, BARRIER); |
| 623 | break; |
| 624 | case Opt_order: |
| 625 | if (strcmp(args[0].from, "relaxed") == 0) |
| 626 | /* Ordered data semantics */ |
| 627 | nilfs_clear_opt(sbi, STRICT_ORDER); |
| 628 | else if (strcmp(args[0].from, "strict") == 0) |
| 629 | /* Strict in-order semantics */ |
| 630 | nilfs_set_opt(sbi, STRICT_ORDER); |
| 631 | else |
| 632 | return 0; |
| 633 | break; |
| 634 | case Opt_err_panic: |
| 635 | nilfs_write_opt(sbi, ERROR_MODE, ERRORS_PANIC); |
| 636 | break; |
| 637 | case Opt_err_ro: |
| 638 | nilfs_write_opt(sbi, ERROR_MODE, ERRORS_RO); |
| 639 | break; |
| 640 | case Opt_err_cont: |
| 641 | nilfs_write_opt(sbi, ERROR_MODE, ERRORS_CONT); |
| 642 | break; |
| 643 | case Opt_snapshot: |
| 644 | if (match_int(&args[0], &option) || option <= 0) |
| 645 | return 0; |
| 646 | if (!(sb->s_flags & MS_RDONLY)) |
| 647 | return 0; |
| 648 | sbi->s_snapshot_cno = option; |
| 649 | nilfs_set_opt(sbi, SNAPSHOT); |
| 650 | break; |
| 651 | default: |
| 652 | printk(KERN_ERR |
| 653 | "NILFS: Unrecognized mount option \"%s\"\n", p); |
| 654 | return 0; |
| 655 | } |
| 656 | } |
| 657 | return 1; |
| 658 | } |
| 659 | |
| 660 | static inline void |
| 661 | nilfs_set_default_options(struct nilfs_sb_info *sbi, |
| 662 | struct nilfs_super_block *sbp) |
| 663 | { |
| 664 | sbi->s_mount_opt = |
| 665 | NILFS_MOUNT_ERRORS_CONT | NILFS_MOUNT_BARRIER; |
| 666 | } |
| 667 | |
| 668 | static int nilfs_setup_super(struct nilfs_sb_info *sbi) |
| 669 | { |
| 670 | struct the_nilfs *nilfs = sbi->s_nilfs; |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 671 | struct nilfs_super_block *sbp = nilfs->ns_sbp[0]; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 672 | int max_mnt_count = le16_to_cpu(sbp->s_max_mnt_count); |
| 673 | int mnt_count = le16_to_cpu(sbp->s_mnt_count); |
| 674 | |
| 675 | /* nilfs->sem must be locked by the caller. */ |
| 676 | if (!(nilfs->ns_mount_state & NILFS_VALID_FS)) { |
| 677 | printk(KERN_WARNING "NILFS warning: mounting unchecked fs\n"); |
| 678 | } else if (nilfs->ns_mount_state & NILFS_ERROR_FS) { |
| 679 | printk(KERN_WARNING |
| 680 | "NILFS warning: mounting fs with errors\n"); |
| 681 | #if 0 |
| 682 | } else if (max_mnt_count >= 0 && mnt_count >= max_mnt_count) { |
| 683 | printk(KERN_WARNING |
| 684 | "NILFS warning: maximal mount count reached\n"); |
| 685 | #endif |
| 686 | } |
| 687 | if (!max_mnt_count) |
| 688 | sbp->s_max_mnt_count = cpu_to_le16(NILFS_DFL_MAX_MNT_COUNT); |
| 689 | |
| 690 | sbp->s_mnt_count = cpu_to_le16(mnt_count + 1); |
| 691 | sbp->s_state = cpu_to_le16(le16_to_cpu(sbp->s_state) & ~NILFS_VALID_FS); |
| 692 | sbp->s_mtime = cpu_to_le64(get_seconds()); |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 693 | return nilfs_commit_super(sbi, 1); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 694 | } |
| 695 | |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 696 | struct nilfs_super_block *nilfs_read_super_block(struct super_block *sb, |
| 697 | u64 pos, int blocksize, |
| 698 | struct buffer_head **pbh) |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 699 | { |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 700 | unsigned long long sb_index = pos; |
| 701 | unsigned long offset; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 702 | |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 703 | offset = do_div(sb_index, blocksize); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 704 | *pbh = sb_bread(sb, sb_index); |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 705 | if (!*pbh) |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 706 | return NULL; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 707 | return (struct nilfs_super_block *)((char *)(*pbh)->b_data + offset); |
| 708 | } |
| 709 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 710 | int nilfs_store_magic_and_option(struct super_block *sb, |
| 711 | struct nilfs_super_block *sbp, |
| 712 | char *data) |
| 713 | { |
| 714 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
| 715 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 716 | sb->s_magic = le16_to_cpu(sbp->s_magic); |
| 717 | |
| 718 | /* FS independent flags */ |
| 719 | #ifdef NILFS_ATIME_DISABLE |
| 720 | sb->s_flags |= MS_NOATIME; |
| 721 | #endif |
| 722 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 723 | nilfs_set_default_options(sbi, sbp); |
| 724 | |
| 725 | sbi->s_resuid = le16_to_cpu(sbp->s_def_resuid); |
| 726 | sbi->s_resgid = le16_to_cpu(sbp->s_def_resgid); |
| 727 | sbi->s_interval = le32_to_cpu(sbp->s_c_interval); |
| 728 | sbi->s_watermark = le32_to_cpu(sbp->s_c_block_max); |
| 729 | |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 730 | return !parse_options(data, sb) ? -EINVAL : 0 ; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 731 | } |
| 732 | |
| 733 | /** |
| 734 | * nilfs_fill_super() - initialize a super block instance |
| 735 | * @sb: super_block |
| 736 | * @data: mount options |
| 737 | * @silent: silent mode flag |
| 738 | * @nilfs: the_nilfs struct |
| 739 | * |
Ryusuke Konishi | aa7dfb8 | 2009-06-08 01:39:33 +0900 | [diff] [blame] | 740 | * This function is called exclusively by nilfs->ns_mount_mutex. |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 741 | * So, the recovery process is protected from other simultaneous mounts. |
| 742 | */ |
| 743 | static int |
| 744 | nilfs_fill_super(struct super_block *sb, void *data, int silent, |
| 745 | struct the_nilfs *nilfs) |
| 746 | { |
| 747 | struct nilfs_sb_info *sbi; |
| 748 | struct inode *root; |
| 749 | __u64 cno; |
| 750 | int err; |
| 751 | |
| 752 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); |
| 753 | if (!sbi) |
| 754 | return -ENOMEM; |
| 755 | |
| 756 | sb->s_fs_info = sbi; |
| 757 | |
| 758 | get_nilfs(nilfs); |
| 759 | sbi->s_nilfs = nilfs; |
| 760 | sbi->s_super = sb; |
Ryusuke Konishi | 6dd4740 | 2009-06-08 01:39:31 +0900 | [diff] [blame] | 761 | atomic_set(&sbi->s_count, 1); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 762 | |
| 763 | err = init_nilfs(nilfs, sbi, (char *)data); |
| 764 | if (err) |
| 765 | goto failed_sbi; |
| 766 | |
| 767 | spin_lock_init(&sbi->s_inode_lock); |
| 768 | INIT_LIST_HEAD(&sbi->s_dirty_files); |
| 769 | INIT_LIST_HEAD(&sbi->s_list); |
| 770 | |
| 771 | /* |
| 772 | * Following initialization is overlapped because |
| 773 | * nilfs_sb_info structure has been cleared at the beginning. |
| 774 | * But we reserve them to keep our interest and make ready |
| 775 | * for the future change. |
| 776 | */ |
| 777 | get_random_bytes(&sbi->s_next_generation, |
| 778 | sizeof(sbi->s_next_generation)); |
| 779 | spin_lock_init(&sbi->s_next_gen_lock); |
| 780 | |
| 781 | sb->s_op = &nilfs_sops; |
| 782 | sb->s_export_op = &nilfs_export_ops; |
| 783 | sb->s_root = NULL; |
Ryusuke Konishi | 6123923 | 2009-04-06 19:02:00 -0700 | [diff] [blame] | 784 | sb->s_time_gran = 1; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 785 | |
| 786 | if (!nilfs_loaded(nilfs)) { |
| 787 | err = load_nilfs(nilfs, sbi); |
| 788 | if (err) |
| 789 | goto failed_sbi; |
| 790 | } |
| 791 | cno = nilfs_last_cno(nilfs); |
| 792 | |
| 793 | if (sb->s_flags & MS_RDONLY) { |
| 794 | if (nilfs_test_opt(sbi, SNAPSHOT)) { |
Zhu Yanhai | 43be0ec | 2009-08-12 14:17:59 +0800 | [diff] [blame^] | 795 | down_read(&nilfs->ns_segctor_sem); |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 796 | err = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile, |
| 797 | sbi->s_snapshot_cno); |
Zhu Yanhai | 43be0ec | 2009-08-12 14:17:59 +0800 | [diff] [blame^] | 798 | up_read(&nilfs->ns_segctor_sem); |
| 799 | if (err < 0) { |
| 800 | if (err == -ENOENT) |
| 801 | err = -EINVAL; |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 802 | goto failed_sbi; |
Zhu Yanhai | 43be0ec | 2009-08-12 14:17:59 +0800 | [diff] [blame^] | 803 | } |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 804 | if (!err) { |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 805 | printk(KERN_ERR |
| 806 | "NILFS: The specified checkpoint is " |
| 807 | "not a snapshot " |
| 808 | "(checkpoint number=%llu).\n", |
| 809 | (unsigned long long)sbi->s_snapshot_cno); |
| 810 | err = -EINVAL; |
| 811 | goto failed_sbi; |
| 812 | } |
| 813 | cno = sbi->s_snapshot_cno; |
| 814 | } else |
| 815 | /* Read-only mount */ |
| 816 | sbi->s_snapshot_cno = cno; |
| 817 | } |
| 818 | |
| 819 | err = nilfs_attach_checkpoint(sbi, cno); |
| 820 | if (err) { |
| 821 | printk(KERN_ERR "NILFS: error loading a checkpoint" |
| 822 | " (checkpoint number=%llu).\n", (unsigned long long)cno); |
| 823 | goto failed_sbi; |
| 824 | } |
| 825 | |
| 826 | if (!(sb->s_flags & MS_RDONLY)) { |
Ryusuke Konishi | cece552 | 2009-04-06 19:01:58 -0700 | [diff] [blame] | 827 | err = nilfs_attach_segment_constructor(sbi); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 828 | if (err) |
| 829 | goto failed_checkpoint; |
| 830 | } |
| 831 | |
| 832 | root = nilfs_iget(sb, NILFS_ROOT_INO); |
| 833 | if (IS_ERR(root)) { |
| 834 | printk(KERN_ERR "NILFS: get root inode failed\n"); |
| 835 | err = PTR_ERR(root); |
| 836 | goto failed_segctor; |
| 837 | } |
| 838 | if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { |
| 839 | iput(root); |
| 840 | printk(KERN_ERR "NILFS: corrupt root inode.\n"); |
| 841 | err = -EINVAL; |
| 842 | goto failed_segctor; |
| 843 | } |
| 844 | sb->s_root = d_alloc_root(root); |
| 845 | if (!sb->s_root) { |
| 846 | iput(root); |
| 847 | printk(KERN_ERR "NILFS: get root dentry failed\n"); |
| 848 | err = -ENOMEM; |
| 849 | goto failed_segctor; |
| 850 | } |
| 851 | |
| 852 | if (!(sb->s_flags & MS_RDONLY)) { |
| 853 | down_write(&nilfs->ns_sem); |
| 854 | nilfs_setup_super(sbi); |
| 855 | up_write(&nilfs->ns_sem); |
| 856 | } |
| 857 | |
| 858 | err = nilfs_mark_recovery_complete(sbi); |
| 859 | if (unlikely(err)) { |
| 860 | printk(KERN_ERR "NILFS: recovery failed.\n"); |
| 861 | goto failed_root; |
| 862 | } |
| 863 | |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 864 | down_write(&nilfs->ns_super_sem); |
Ryusuke Konishi | 3f82ff5 | 2009-06-08 01:39:30 +0900 | [diff] [blame] | 865 | if (!nilfs_test_opt(sbi, SNAPSHOT)) |
| 866 | nilfs->ns_current = sbi; |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 867 | up_write(&nilfs->ns_super_sem); |
Ryusuke Konishi | 3f82ff5 | 2009-06-08 01:39:30 +0900 | [diff] [blame] | 868 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 869 | return 0; |
| 870 | |
| 871 | failed_root: |
| 872 | dput(sb->s_root); |
| 873 | sb->s_root = NULL; |
| 874 | |
| 875 | failed_segctor: |
| 876 | nilfs_detach_segment_constructor(sbi); |
| 877 | |
| 878 | failed_checkpoint: |
| 879 | nilfs_detach_checkpoint(sbi); |
| 880 | |
| 881 | failed_sbi: |
| 882 | put_nilfs(nilfs); |
| 883 | sb->s_fs_info = NULL; |
Ryusuke Konishi | 6dd4740 | 2009-06-08 01:39:31 +0900 | [diff] [blame] | 884 | nilfs_put_sbinfo(sbi); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 885 | return err; |
| 886 | } |
| 887 | |
| 888 | static int nilfs_remount(struct super_block *sb, int *flags, char *data) |
| 889 | { |
| 890 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
| 891 | struct nilfs_super_block *sbp; |
| 892 | struct the_nilfs *nilfs = sbi->s_nilfs; |
| 893 | unsigned long old_sb_flags; |
| 894 | struct nilfs_mount_options old_opts; |
| 895 | int err; |
| 896 | |
Alessio Igor Bogani | 337eb00 | 2009-05-12 15:10:54 +0200 | [diff] [blame] | 897 | lock_kernel(); |
| 898 | |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 899 | down_write(&nilfs->ns_super_sem); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 900 | old_sb_flags = sb->s_flags; |
| 901 | old_opts.mount_opt = sbi->s_mount_opt; |
| 902 | old_opts.snapshot_cno = sbi->s_snapshot_cno; |
| 903 | |
| 904 | if (!parse_options(data, sb)) { |
| 905 | err = -EINVAL; |
| 906 | goto restore_opts; |
| 907 | } |
| 908 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL); |
| 909 | |
| 910 | if ((*flags & MS_RDONLY) && |
| 911 | sbi->s_snapshot_cno != old_opts.snapshot_cno) { |
| 912 | printk(KERN_WARNING "NILFS (device %s): couldn't " |
| 913 | "remount to a different snapshot. \n", |
| 914 | sb->s_id); |
| 915 | err = -EINVAL; |
| 916 | goto restore_opts; |
| 917 | } |
| 918 | |
| 919 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
| 920 | goto out; |
| 921 | if (*flags & MS_RDONLY) { |
| 922 | /* Shutting down the segment constructor */ |
| 923 | nilfs_detach_segment_constructor(sbi); |
| 924 | sb->s_flags |= MS_RDONLY; |
| 925 | |
| 926 | sbi->s_snapshot_cno = nilfs_last_cno(nilfs); |
| 927 | /* nilfs_set_opt(sbi, SNAPSHOT); */ |
| 928 | |
| 929 | /* |
| 930 | * Remounting a valid RW partition RDONLY, so set |
| 931 | * the RDONLY flag and then mark the partition as valid again. |
| 932 | */ |
| 933 | down_write(&nilfs->ns_sem); |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 934 | sbp = nilfs->ns_sbp[0]; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 935 | if (!(sbp->s_state & le16_to_cpu(NILFS_VALID_FS)) && |
| 936 | (nilfs->ns_mount_state & NILFS_VALID_FS)) |
| 937 | sbp->s_state = cpu_to_le16(nilfs->ns_mount_state); |
| 938 | sbp->s_mtime = cpu_to_le64(get_seconds()); |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 939 | nilfs_commit_super(sbi, 1); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 940 | up_write(&nilfs->ns_sem); |
| 941 | } else { |
| 942 | /* |
| 943 | * Mounting a RDONLY partition read-write, so reread and |
| 944 | * store the current valid flag. (It may have been changed |
| 945 | * by fsck since we originally mounted the partition.) |
| 946 | */ |
Ryusuke Konishi | 3f82ff5 | 2009-06-08 01:39:30 +0900 | [diff] [blame] | 947 | if (nilfs->ns_current && nilfs->ns_current != sbi) { |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 948 | printk(KERN_WARNING "NILFS (device %s): couldn't " |
Ryusuke Konishi | 3f82ff5 | 2009-06-08 01:39:30 +0900 | [diff] [blame] | 949 | "remount because an RW-mount exists.\n", |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 950 | sb->s_id); |
| 951 | err = -EBUSY; |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 952 | goto restore_opts; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 953 | } |
| 954 | if (sbi->s_snapshot_cno != nilfs_last_cno(nilfs)) { |
| 955 | printk(KERN_WARNING "NILFS (device %s): couldn't " |
| 956 | "remount because the current RO-mount is not " |
| 957 | "the latest one.\n", |
| 958 | sb->s_id); |
| 959 | err = -EINVAL; |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 960 | goto restore_opts; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 961 | } |
| 962 | sb->s_flags &= ~MS_RDONLY; |
| 963 | nilfs_clear_opt(sbi, SNAPSHOT); |
| 964 | sbi->s_snapshot_cno = 0; |
| 965 | |
Ryusuke Konishi | cece552 | 2009-04-06 19:01:58 -0700 | [diff] [blame] | 966 | err = nilfs_attach_segment_constructor(sbi); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 967 | if (err) |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 968 | goto restore_opts; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 969 | |
| 970 | down_write(&nilfs->ns_sem); |
| 971 | nilfs_setup_super(sbi); |
| 972 | up_write(&nilfs->ns_sem); |
| 973 | |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 974 | nilfs->ns_current = sbi; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 975 | } |
| 976 | out: |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 977 | up_write(&nilfs->ns_super_sem); |
Alessio Igor Bogani | 337eb00 | 2009-05-12 15:10:54 +0200 | [diff] [blame] | 978 | unlock_kernel(); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 979 | return 0; |
| 980 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 981 | restore_opts: |
| 982 | sb->s_flags = old_sb_flags; |
| 983 | sbi->s_mount_opt = old_opts.mount_opt; |
| 984 | sbi->s_snapshot_cno = old_opts.snapshot_cno; |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 985 | up_write(&nilfs->ns_super_sem); |
Alessio Igor Bogani | 337eb00 | 2009-05-12 15:10:54 +0200 | [diff] [blame] | 986 | unlock_kernel(); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 987 | return err; |
| 988 | } |
| 989 | |
| 990 | struct nilfs_super_data { |
| 991 | struct block_device *bdev; |
Ryusuke Konishi | 6dd4740 | 2009-06-08 01:39:31 +0900 | [diff] [blame] | 992 | struct nilfs_sb_info *sbi; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 993 | __u64 cno; |
| 994 | int flags; |
| 995 | }; |
| 996 | |
| 997 | /** |
| 998 | * nilfs_identify - pre-read mount options needed to identify mount instance |
| 999 | * @data: mount options |
| 1000 | * @sd: nilfs_super_data |
| 1001 | */ |
| 1002 | static int nilfs_identify(char *data, struct nilfs_super_data *sd) |
| 1003 | { |
| 1004 | char *p, *options = data; |
| 1005 | substring_t args[MAX_OPT_ARGS]; |
| 1006 | int option, token; |
| 1007 | int ret = 0; |
| 1008 | |
| 1009 | do { |
| 1010 | p = strsep(&options, ","); |
| 1011 | if (p != NULL && *p) { |
| 1012 | token = match_token(p, tokens, args); |
| 1013 | if (token == Opt_snapshot) { |
| 1014 | if (!(sd->flags & MS_RDONLY)) |
| 1015 | ret++; |
| 1016 | else { |
| 1017 | ret = match_int(&args[0], &option); |
| 1018 | if (!ret) { |
| 1019 | if (option > 0) |
| 1020 | sd->cno = option; |
| 1021 | else |
| 1022 | ret++; |
| 1023 | } |
| 1024 | } |
| 1025 | } |
| 1026 | if (ret) |
| 1027 | printk(KERN_ERR |
| 1028 | "NILFS: invalid mount option: %s\n", p); |
| 1029 | } |
| 1030 | if (!options) |
| 1031 | break; |
| 1032 | BUG_ON(options == data); |
| 1033 | *(options - 1) = ','; |
| 1034 | } while (!ret); |
| 1035 | return ret; |
| 1036 | } |
| 1037 | |
| 1038 | static int nilfs_set_bdev_super(struct super_block *s, void *data) |
| 1039 | { |
| 1040 | struct nilfs_super_data *sd = data; |
| 1041 | |
| 1042 | s->s_bdev = sd->bdev; |
| 1043 | s->s_dev = s->s_bdev->bd_dev; |
| 1044 | return 0; |
| 1045 | } |
| 1046 | |
| 1047 | static int nilfs_test_bdev_super(struct super_block *s, void *data) |
| 1048 | { |
| 1049 | struct nilfs_super_data *sd = data; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1050 | |
Ryusuke Konishi | 6dd4740 | 2009-06-08 01:39:31 +0900 | [diff] [blame] | 1051 | return sd->sbi && s->s_fs_info == (void *)sd->sbi; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1052 | } |
| 1053 | |
| 1054 | static int |
| 1055 | nilfs_get_sb(struct file_system_type *fs_type, int flags, |
| 1056 | const char *dev_name, void *data, struct vfsmount *mnt) |
| 1057 | { |
| 1058 | struct nilfs_super_data sd; |
Ryusuke Konishi | 33c8e57 | 2009-06-08 01:39:29 +0900 | [diff] [blame] | 1059 | struct super_block *s; |
| 1060 | struct the_nilfs *nilfs; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1061 | int err, need_to_close = 1; |
| 1062 | |
| 1063 | sd.bdev = open_bdev_exclusive(dev_name, flags, fs_type); |
| 1064 | if (IS_ERR(sd.bdev)) |
| 1065 | return PTR_ERR(sd.bdev); |
| 1066 | |
| 1067 | /* |
| 1068 | * To get mount instance using sget() vfs-routine, NILFS needs |
| 1069 | * much more information than normal filesystems to identify mount |
| 1070 | * instance. For snapshot mounts, not only a mount type (ro-mount |
| 1071 | * or rw-mount) but also a checkpoint number is required. |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1072 | */ |
| 1073 | sd.cno = 0; |
| 1074 | sd.flags = flags; |
| 1075 | if (nilfs_identify((char *)data, &sd)) { |
| 1076 | err = -EINVAL; |
| 1077 | goto failed; |
| 1078 | } |
| 1079 | |
Ryusuke Konishi | 33c8e57 | 2009-06-08 01:39:29 +0900 | [diff] [blame] | 1080 | nilfs = find_or_create_nilfs(sd.bdev); |
| 1081 | if (!nilfs) { |
| 1082 | err = -ENOMEM; |
| 1083 | goto failed; |
| 1084 | } |
| 1085 | |
Ryusuke Konishi | aa7dfb8 | 2009-06-08 01:39:33 +0900 | [diff] [blame] | 1086 | mutex_lock(&nilfs->ns_mount_mutex); |
Ryusuke Konishi | 3f82ff5 | 2009-06-08 01:39:30 +0900 | [diff] [blame] | 1087 | |
| 1088 | if (!sd.cno) { |
| 1089 | /* |
| 1090 | * Check if an exclusive mount exists or not. |
| 1091 | * Snapshot mounts coexist with a current mount |
| 1092 | * (i.e. rw-mount or ro-mount), whereas rw-mount and |
| 1093 | * ro-mount are mutually exclusive. |
| 1094 | */ |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 1095 | down_read(&nilfs->ns_super_sem); |
Ryusuke Konishi | 3f82ff5 | 2009-06-08 01:39:30 +0900 | [diff] [blame] | 1096 | if (nilfs->ns_current && |
| 1097 | ((nilfs->ns_current->s_super->s_flags ^ flags) |
| 1098 | & MS_RDONLY)) { |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 1099 | up_read(&nilfs->ns_super_sem); |
Ryusuke Konishi | 3f82ff5 | 2009-06-08 01:39:30 +0900 | [diff] [blame] | 1100 | err = -EBUSY; |
| 1101 | goto failed_unlock; |
| 1102 | } |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 1103 | up_read(&nilfs->ns_super_sem); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1104 | } |
| 1105 | |
| 1106 | /* |
Ryusuke Konishi | 6dd4740 | 2009-06-08 01:39:31 +0900 | [diff] [blame] | 1107 | * Find existing nilfs_sb_info struct |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1108 | */ |
Ryusuke Konishi | 6dd4740 | 2009-06-08 01:39:31 +0900 | [diff] [blame] | 1109 | sd.sbi = nilfs_find_sbinfo(nilfs, !(flags & MS_RDONLY), sd.cno); |
| 1110 | |
Ryusuke Konishi | 6dd4740 | 2009-06-08 01:39:31 +0900 | [diff] [blame] | 1111 | /* |
| 1112 | * Get super block instance holding the nilfs_sb_info struct. |
| 1113 | * A new instance is allocated if no existing mount is present or |
| 1114 | * existing instance has been unmounted. |
| 1115 | */ |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1116 | 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] | 1117 | if (sd.sbi) |
| 1118 | nilfs_put_sbinfo(sd.sbi); |
| 1119 | |
Ryusuke Konishi | 33c8e57 | 2009-06-08 01:39:29 +0900 | [diff] [blame] | 1120 | if (IS_ERR(s)) { |
| 1121 | err = PTR_ERR(s); |
| 1122 | goto failed_unlock; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1123 | } |
| 1124 | |
| 1125 | if (!s->s_root) { |
| 1126 | char b[BDEVNAME_SIZE]; |
| 1127 | |
Ryusuke Konishi | 33c8e57 | 2009-06-08 01:39:29 +0900 | [diff] [blame] | 1128 | /* New superblock instance created */ |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1129 | s->s_flags = flags; |
| 1130 | strlcpy(s->s_id, bdevname(sd.bdev, b), sizeof(s->s_id)); |
| 1131 | sb_set_blocksize(s, block_size(sd.bdev)); |
| 1132 | |
| 1133 | err = nilfs_fill_super(s, data, flags & MS_VERBOSE, nilfs); |
| 1134 | if (err) |
| 1135 | goto cancel_new; |
| 1136 | |
| 1137 | s->s_flags |= MS_ACTIVE; |
| 1138 | need_to_close = 0; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1139 | } |
| 1140 | |
Ryusuke Konishi | aa7dfb8 | 2009-06-08 01:39:33 +0900 | [diff] [blame] | 1141 | mutex_unlock(&nilfs->ns_mount_mutex); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1142 | put_nilfs(nilfs); |
| 1143 | if (need_to_close) |
| 1144 | close_bdev_exclusive(sd.bdev, flags); |
| 1145 | simple_set_mnt(mnt, s); |
| 1146 | return 0; |
| 1147 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1148 | failed_unlock: |
Ryusuke Konishi | aa7dfb8 | 2009-06-08 01:39:33 +0900 | [diff] [blame] | 1149 | mutex_unlock(&nilfs->ns_mount_mutex); |
Ryusuke Konishi | 33c8e57 | 2009-06-08 01:39:29 +0900 | [diff] [blame] | 1150 | put_nilfs(nilfs); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1151 | failed: |
| 1152 | close_bdev_exclusive(sd.bdev, flags); |
| 1153 | |
| 1154 | return err; |
| 1155 | |
| 1156 | cancel_new: |
| 1157 | /* Abandoning the newly allocated superblock */ |
Ryusuke Konishi | aa7dfb8 | 2009-06-08 01:39:33 +0900 | [diff] [blame] | 1158 | mutex_unlock(&nilfs->ns_mount_mutex); |
Ryusuke Konishi | 33c8e57 | 2009-06-08 01:39:29 +0900 | [diff] [blame] | 1159 | put_nilfs(nilfs); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1160 | up_write(&s->s_umount); |
| 1161 | deactivate_super(s); |
| 1162 | /* |
| 1163 | * deactivate_super() invokes close_bdev_exclusive(). |
| 1164 | * We must finish all post-cleaning before this call; |
Ryusuke Konishi | aa7dfb8 | 2009-06-08 01:39:33 +0900 | [diff] [blame] | 1165 | * put_nilfs() needs the block device. |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1166 | */ |
| 1167 | return err; |
| 1168 | } |
| 1169 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1170 | struct file_system_type nilfs_fs_type = { |
| 1171 | .owner = THIS_MODULE, |
| 1172 | .name = "nilfs2", |
| 1173 | .get_sb = nilfs_get_sb, |
| 1174 | .kill_sb = kill_block_super, |
| 1175 | .fs_flags = FS_REQUIRES_DEV, |
| 1176 | }; |
| 1177 | |
| 1178 | static int __init init_nilfs_fs(void) |
| 1179 | { |
| 1180 | int err; |
| 1181 | |
| 1182 | err = nilfs_init_inode_cache(); |
| 1183 | if (err) |
| 1184 | goto failed; |
| 1185 | |
| 1186 | err = nilfs_init_transaction_cache(); |
| 1187 | if (err) |
| 1188 | goto failed_inode_cache; |
| 1189 | |
| 1190 | err = nilfs_init_segbuf_cache(); |
| 1191 | if (err) |
| 1192 | goto failed_transaction_cache; |
| 1193 | |
| 1194 | err = nilfs_btree_path_cache_init(); |
| 1195 | if (err) |
| 1196 | goto failed_segbuf_cache; |
| 1197 | |
| 1198 | err = register_filesystem(&nilfs_fs_type); |
| 1199 | if (err) |
| 1200 | goto failed_btree_path_cache; |
| 1201 | |
| 1202 | return 0; |
| 1203 | |
| 1204 | failed_btree_path_cache: |
| 1205 | nilfs_btree_path_cache_destroy(); |
| 1206 | |
| 1207 | failed_segbuf_cache: |
| 1208 | nilfs_destroy_segbuf_cache(); |
| 1209 | |
| 1210 | failed_transaction_cache: |
| 1211 | nilfs_destroy_transaction_cache(); |
| 1212 | |
| 1213 | failed_inode_cache: |
| 1214 | nilfs_destroy_inode_cache(); |
| 1215 | |
| 1216 | failed: |
| 1217 | return err; |
| 1218 | } |
| 1219 | |
| 1220 | static void __exit exit_nilfs_fs(void) |
| 1221 | { |
| 1222 | nilfs_destroy_segbuf_cache(); |
| 1223 | nilfs_destroy_transaction_cache(); |
| 1224 | nilfs_destroy_inode_cache(); |
| 1225 | nilfs_btree_path_cache_destroy(); |
| 1226 | unregister_filesystem(&nilfs_fs_type); |
| 1227 | } |
| 1228 | |
| 1229 | module_init(init_nilfs_fs) |
| 1230 | module_exit(exit_nilfs_fs) |