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> |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 48 | #include <linux/vfs.h> |
| 49 | #include <linux/writeback.h> |
| 50 | #include <linux/kobject.h> |
| 51 | #include <linux/exportfs.h> |
Jiro SEKIBA | b58a285 | 2009-06-24 20:06:34 +0900 | [diff] [blame] | 52 | #include <linux/seq_file.h> |
| 53 | #include <linux/mount.h> |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 54 | #include "nilfs.h" |
| 55 | #include "mdt.h" |
| 56 | #include "alloc.h" |
Ryusuke Konishi | 05d0e94 | 2010-07-10 20:52:09 +0900 | [diff] [blame] | 57 | #include "btree.h" |
| 58 | #include "btnode.h" |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 59 | #include "page.h" |
| 60 | #include "cpfile.h" |
| 61 | #include "ifile.h" |
| 62 | #include "dat.h" |
| 63 | #include "segment.h" |
| 64 | #include "segbuf.h" |
| 65 | |
| 66 | MODULE_AUTHOR("NTT Corp."); |
| 67 | MODULE_DESCRIPTION("A New Implementation of the Log-structured Filesystem " |
| 68 | "(NILFS)"); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 69 | MODULE_LICENSE("GPL"); |
| 70 | |
Li Hong | 41c88bd | 2010-04-06 00:54:11 +0800 | [diff] [blame] | 71 | struct kmem_cache *nilfs_inode_cachep; |
| 72 | struct kmem_cache *nilfs_transaction_cachep; |
| 73 | struct kmem_cache *nilfs_segbuf_cachep; |
| 74 | struct kmem_cache *nilfs_btree_path_cache; |
| 75 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 76 | static int nilfs_remount(struct super_block *sb, int *flags, char *data); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 77 | |
Ryusuke Konishi | c8a11c8 | 2010-06-28 17:49:30 +0900 | [diff] [blame] | 78 | static void nilfs_set_error(struct nilfs_sb_info *sbi) |
| 79 | { |
| 80 | struct the_nilfs *nilfs = sbi->s_nilfs; |
Jiro SEKIBA | d26493b | 2010-06-28 17:49:32 +0900 | [diff] [blame] | 81 | struct nilfs_super_block **sbp; |
Ryusuke Konishi | c8a11c8 | 2010-06-28 17:49:30 +0900 | [diff] [blame] | 82 | |
| 83 | down_write(&nilfs->ns_sem); |
| 84 | if (!(nilfs->ns_mount_state & NILFS_ERROR_FS)) { |
| 85 | nilfs->ns_mount_state |= NILFS_ERROR_FS; |
Jiro SEKIBA | b2ac86e | 2010-06-28 17:49:33 +0900 | [diff] [blame] | 86 | sbp = nilfs_prepare_super(sbi, 0); |
Jiro SEKIBA | d26493b | 2010-06-28 17:49:32 +0900 | [diff] [blame] | 87 | if (likely(sbp)) { |
| 88 | sbp[0]->s_state |= cpu_to_le16(NILFS_ERROR_FS); |
Jiro SEKIBA | b2ac86e | 2010-06-28 17:49:33 +0900 | [diff] [blame] | 89 | if (sbp[1]) |
| 90 | sbp[1]->s_state |= cpu_to_le16(NILFS_ERROR_FS); |
| 91 | nilfs_commit_super(sbi, NILFS_SB_COMMIT_ALL); |
Jiro SEKIBA | d26493b | 2010-06-28 17:49:32 +0900 | [diff] [blame] | 92 | } |
Ryusuke Konishi | c8a11c8 | 2010-06-28 17:49:30 +0900 | [diff] [blame] | 93 | } |
| 94 | up_write(&nilfs->ns_sem); |
| 95 | } |
| 96 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 97 | /** |
| 98 | * nilfs_error() - report failure condition on a filesystem |
| 99 | * |
| 100 | * nilfs_error() sets an ERROR_FS flag on the superblock as well as |
| 101 | * reporting an error message. It should be called when NILFS detects |
| 102 | * incoherences or defects of meta data on disk. As for sustainable |
| 103 | * errors such as a single-shot I/O error, nilfs_warning() or the printk() |
| 104 | * function should be used instead. |
| 105 | * |
| 106 | * The segment constructor must not call this function because it can |
| 107 | * kill itself. |
| 108 | */ |
| 109 | void nilfs_error(struct super_block *sb, const char *function, |
| 110 | const char *fmt, ...) |
| 111 | { |
| 112 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
| 113 | va_list args; |
| 114 | |
| 115 | va_start(args, fmt); |
| 116 | printk(KERN_CRIT "NILFS error (device %s): %s: ", sb->s_id, function); |
| 117 | vprintk(fmt, args); |
| 118 | printk("\n"); |
| 119 | va_end(args); |
| 120 | |
| 121 | if (!(sb->s_flags & MS_RDONLY)) { |
Ryusuke Konishi | c8a11c8 | 2010-06-28 17:49:30 +0900 | [diff] [blame] | 122 | nilfs_set_error(sbi); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 123 | |
| 124 | if (nilfs_test_opt(sbi, ERRORS_RO)) { |
| 125 | printk(KERN_CRIT "Remounting filesystem read-only\n"); |
| 126 | sb->s_flags |= MS_RDONLY; |
| 127 | } |
| 128 | } |
| 129 | |
| 130 | if (nilfs_test_opt(sbi, ERRORS_PANIC)) |
| 131 | panic("NILFS (device %s): panic forced after error\n", |
| 132 | sb->s_id); |
| 133 | } |
| 134 | |
| 135 | void nilfs_warning(struct super_block *sb, const char *function, |
| 136 | const char *fmt, ...) |
| 137 | { |
| 138 | va_list args; |
| 139 | |
| 140 | va_start(args, fmt); |
| 141 | printk(KERN_WARNING "NILFS warning (device %s): %s: ", |
| 142 | sb->s_id, function); |
| 143 | vprintk(fmt, args); |
| 144 | printk("\n"); |
| 145 | va_end(args); |
| 146 | } |
| 147 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 148 | |
Ryusuke Konishi | a53b475 | 2009-05-27 22:11:46 +0900 | [diff] [blame] | 149 | struct inode *nilfs_alloc_inode_common(struct the_nilfs *nilfs) |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 150 | { |
| 151 | struct nilfs_inode_info *ii; |
| 152 | |
| 153 | ii = kmem_cache_alloc(nilfs_inode_cachep, GFP_NOFS); |
| 154 | if (!ii) |
| 155 | return NULL; |
| 156 | ii->i_bh = NULL; |
| 157 | ii->i_state = 0; |
| 158 | ii->vfs_inode.i_version = 1; |
Ryusuke Konishi | a53b475 | 2009-05-27 22:11:46 +0900 | [diff] [blame] | 159 | nilfs_btnode_cache_init(&ii->i_btnode_cache, nilfs->ns_bdi); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 160 | return &ii->vfs_inode; |
| 161 | } |
| 162 | |
Ryusuke Konishi | a53b475 | 2009-05-27 22:11:46 +0900 | [diff] [blame] | 163 | struct inode *nilfs_alloc_inode(struct super_block *sb) |
| 164 | { |
| 165 | return nilfs_alloc_inode_common(NILFS_SB(sb)->s_nilfs); |
| 166 | } |
| 167 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 168 | void nilfs_destroy_inode(struct inode *inode) |
| 169 | { |
Ryusuke Konishi | b91c9a9 | 2010-08-20 23:46:06 +0900 | [diff] [blame] | 170 | struct nilfs_mdt_info *mdi = NILFS_MDT(inode); |
| 171 | |
| 172 | if (mdi) { |
| 173 | kfree(mdi->mi_bgl); /* kfree(NULL) is safe */ |
| 174 | kfree(mdi); |
| 175 | } |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 176 | kmem_cache_free(nilfs_inode_cachep, NILFS_I(inode)); |
| 177 | } |
| 178 | |
Jiro SEKIBA | b2ac86e | 2010-06-28 17:49:33 +0900 | [diff] [blame] | 179 | static int nilfs_sync_super(struct nilfs_sb_info *sbi, int flag) |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 180 | { |
| 181 | struct the_nilfs *nilfs = sbi->s_nilfs; |
| 182 | int err; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 183 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 184 | retry: |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 185 | set_buffer_dirty(nilfs->ns_sbh[0]); |
Christoph Hellwig | 87e9951 | 2010-08-11 17:05:45 +0200 | [diff] [blame] | 186 | |
| 187 | if (nilfs_test_opt(sbi, BARRIER)) { |
| 188 | err = __sync_dirty_buffer(nilfs->ns_sbh[0], |
| 189 | WRITE_SYNC | WRITE_BARRIER); |
| 190 | if (err == -EOPNOTSUPP) { |
| 191 | nilfs_warning(sbi->s_super, __func__, |
| 192 | "barrier-based sync failed. " |
| 193 | "disabling barriers\n"); |
| 194 | nilfs_clear_opt(sbi, BARRIER); |
| 195 | goto retry; |
| 196 | } |
| 197 | } else { |
| 198 | err = sync_dirty_buffer(nilfs->ns_sbh[0]); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 199 | } |
Christoph Hellwig | 87e9951 | 2010-08-11 17:05:45 +0200 | [diff] [blame] | 200 | |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 201 | if (unlikely(err)) { |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 202 | printk(KERN_ERR |
| 203 | "NILFS: unable to write superblock (err=%d)\n", err); |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 204 | if (err == -EIO && nilfs->ns_sbh[1]) { |
Jiro SEKIBA | b2ac86e | 2010-06-28 17:49:33 +0900 | [diff] [blame] | 205 | /* |
| 206 | * sbp[0] points to newer log than sbp[1], |
| 207 | * so copy sbp[0] to sbp[1] to take over sbp[0]. |
| 208 | */ |
| 209 | memcpy(nilfs->ns_sbp[1], nilfs->ns_sbp[0], |
| 210 | nilfs->ns_sbsize); |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 211 | nilfs_fall_back_super_block(nilfs); |
| 212 | goto retry; |
| 213 | } |
| 214 | } else { |
| 215 | struct nilfs_super_block *sbp = nilfs->ns_sbp[0]; |
| 216 | |
Jiro SEKIBA | b2ac86e | 2010-06-28 17:49:33 +0900 | [diff] [blame] | 217 | nilfs->ns_sbwcount++; |
| 218 | |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 219 | /* |
| 220 | * The latest segment becomes trailable from the position |
| 221 | * written in superblock. |
| 222 | */ |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 223 | clear_nilfs_discontinued(nilfs); |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 224 | |
| 225 | /* update GC protection for recent segments */ |
| 226 | if (nilfs->ns_sbh[1]) { |
Jiro SEKIBA | b2ac86e | 2010-06-28 17:49:33 +0900 | [diff] [blame] | 227 | if (flag == NILFS_SB_COMMIT_ALL) { |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 228 | set_buffer_dirty(nilfs->ns_sbh[1]); |
Jiro SEKIBA | b2ac86e | 2010-06-28 17:49:33 +0900 | [diff] [blame] | 229 | if (sync_dirty_buffer(nilfs->ns_sbh[1]) < 0) |
| 230 | goto out; |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 231 | } |
Jiro SEKIBA | b2ac86e | 2010-06-28 17:49:33 +0900 | [diff] [blame] | 232 | if (le64_to_cpu(nilfs->ns_sbp[1]->s_last_cno) < |
| 233 | le64_to_cpu(nilfs->ns_sbp[0]->s_last_cno)) |
| 234 | sbp = nilfs->ns_sbp[1]; |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 235 | } |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 236 | |
Jiro SEKIBA | b2ac86e | 2010-06-28 17:49:33 +0900 | [diff] [blame] | 237 | spin_lock(&nilfs->ns_last_segment_lock); |
| 238 | nilfs->ns_prot_seq = le64_to_cpu(sbp->s_last_seq); |
| 239 | spin_unlock(&nilfs->ns_last_segment_lock); |
| 240 | } |
| 241 | out: |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 242 | return err; |
| 243 | } |
| 244 | |
Ryusuke Konishi | 60f46b7 | 2010-06-28 17:49:31 +0900 | [diff] [blame] | 245 | void nilfs_set_log_cursor(struct nilfs_super_block *sbp, |
| 246 | struct the_nilfs *nilfs) |
| 247 | { |
| 248 | sector_t nfreeblocks; |
| 249 | |
| 250 | /* nilfs->ns_sem must be locked by the caller. */ |
| 251 | nilfs_count_free_blocks(nilfs, &nfreeblocks); |
| 252 | sbp->s_free_blocks_count = cpu_to_le64(nfreeblocks); |
| 253 | |
| 254 | spin_lock(&nilfs->ns_last_segment_lock); |
| 255 | sbp->s_last_seq = cpu_to_le64(nilfs->ns_last_seq); |
| 256 | sbp->s_last_pseg = cpu_to_le64(nilfs->ns_last_pseg); |
| 257 | sbp->s_last_cno = cpu_to_le64(nilfs->ns_last_cno); |
| 258 | spin_unlock(&nilfs->ns_last_segment_lock); |
| 259 | } |
| 260 | |
Jiro SEKIBA | b2ac86e | 2010-06-28 17:49:33 +0900 | [diff] [blame] | 261 | struct nilfs_super_block **nilfs_prepare_super(struct nilfs_sb_info *sbi, |
| 262 | int flip) |
Jiro SEKIBA | d26493b | 2010-06-28 17:49:32 +0900 | [diff] [blame] | 263 | { |
| 264 | struct the_nilfs *nilfs = sbi->s_nilfs; |
| 265 | struct nilfs_super_block **sbp = nilfs->ns_sbp; |
| 266 | |
| 267 | /* nilfs->ns_sem must be locked by the caller. */ |
| 268 | if (sbp[0]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) { |
| 269 | if (sbp[1] && |
| 270 | sbp[1]->s_magic == cpu_to_le16(NILFS_SUPER_MAGIC)) { |
Jiro SEKIBA | b2ac86e | 2010-06-28 17:49:33 +0900 | [diff] [blame] | 271 | memcpy(sbp[0], sbp[1], nilfs->ns_sbsize); |
Jiro SEKIBA | d26493b | 2010-06-28 17:49:32 +0900 | [diff] [blame] | 272 | } else { |
| 273 | printk(KERN_CRIT "NILFS: superblock broke on dev %s\n", |
| 274 | sbi->s_super->s_id); |
| 275 | return NULL; |
| 276 | } |
Jiro SEKIBA | b2ac86e | 2010-06-28 17:49:33 +0900 | [diff] [blame] | 277 | } else if (sbp[1] && |
| 278 | sbp[1]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) { |
| 279 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); |
Jiro SEKIBA | d26493b | 2010-06-28 17:49:32 +0900 | [diff] [blame] | 280 | } |
Jiro SEKIBA | b2ac86e | 2010-06-28 17:49:33 +0900 | [diff] [blame] | 281 | |
| 282 | if (flip && sbp[1]) |
| 283 | nilfs_swap_super_block(nilfs); |
| 284 | |
Jiro SEKIBA | d26493b | 2010-06-28 17:49:32 +0900 | [diff] [blame] | 285 | return sbp; |
| 286 | } |
| 287 | |
Jiro SEKIBA | b2ac86e | 2010-06-28 17:49:33 +0900 | [diff] [blame] | 288 | int nilfs_commit_super(struct nilfs_sb_info *sbi, int flag) |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 289 | { |
| 290 | struct the_nilfs *nilfs = sbi->s_nilfs; |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 291 | struct nilfs_super_block **sbp = nilfs->ns_sbp; |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 292 | time_t t; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 293 | |
Jiro SEKIBA | d26493b | 2010-06-28 17:49:32 +0900 | [diff] [blame] | 294 | /* nilfs->ns_sem must be locked by the caller. */ |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 295 | t = get_seconds(); |
Jiro SEKIBA | b2ac86e | 2010-06-28 17:49:33 +0900 | [diff] [blame] | 296 | nilfs->ns_sbwtime = t; |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 297 | sbp[0]->s_wtime = cpu_to_le64(t); |
| 298 | sbp[0]->s_sum = 0; |
| 299 | sbp[0]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed, |
| 300 | (unsigned char *)sbp[0], |
| 301 | nilfs->ns_sbsize)); |
Jiro SEKIBA | b2ac86e | 2010-06-28 17:49:33 +0900 | [diff] [blame] | 302 | if (flag == NILFS_SB_COMMIT_ALL && sbp[1]) { |
| 303 | sbp[1]->s_wtime = sbp[0]->s_wtime; |
| 304 | sbp[1]->s_sum = 0; |
| 305 | sbp[1]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed, |
| 306 | (unsigned char *)sbp[1], |
| 307 | nilfs->ns_sbsize)); |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 308 | } |
Ryusuke Konishi | e605f0a | 2009-12-09 00:57:52 +0900 | [diff] [blame] | 309 | clear_nilfs_sb_dirty(nilfs); |
Jiro SEKIBA | b2ac86e | 2010-06-28 17:49:33 +0900 | [diff] [blame] | 310 | return nilfs_sync_super(sbi, flag); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 311 | } |
| 312 | |
Ryusuke Konishi | 7ecaa46 | 2010-06-28 17:49:29 +0900 | [diff] [blame] | 313 | /** |
| 314 | * nilfs_cleanup_super() - write filesystem state for cleanup |
| 315 | * @sbi: nilfs_sb_info to be unmounted or degraded to read-only |
| 316 | * |
| 317 | * This function restores state flags in the on-disk super block. |
| 318 | * This will set "clean" flag (i.e. NILFS_VALID_FS) unless the |
| 319 | * filesystem was not clean previously. |
| 320 | */ |
| 321 | int nilfs_cleanup_super(struct nilfs_sb_info *sbi) |
| 322 | { |
Jiro SEKIBA | d26493b | 2010-06-28 17:49:32 +0900 | [diff] [blame] | 323 | struct nilfs_super_block **sbp; |
Jiro SEKIBA | b2ac86e | 2010-06-28 17:49:33 +0900 | [diff] [blame] | 324 | int flag = NILFS_SB_COMMIT; |
Jiro SEKIBA | d26493b | 2010-06-28 17:49:32 +0900 | [diff] [blame] | 325 | int ret = -EIO; |
Ryusuke Konishi | 7ecaa46 | 2010-06-28 17:49:29 +0900 | [diff] [blame] | 326 | |
Jiro SEKIBA | b2ac86e | 2010-06-28 17:49:33 +0900 | [diff] [blame] | 327 | sbp = nilfs_prepare_super(sbi, 0); |
Jiro SEKIBA | d26493b | 2010-06-28 17:49:32 +0900 | [diff] [blame] | 328 | if (sbp) { |
| 329 | sbp[0]->s_state = cpu_to_le16(sbi->s_nilfs->ns_mount_state); |
Jiro SEKIBA | b2ac86e | 2010-06-28 17:49:33 +0900 | [diff] [blame] | 330 | nilfs_set_log_cursor(sbp[0], sbi->s_nilfs); |
| 331 | if (sbp[1] && sbp[0]->s_last_cno == sbp[1]->s_last_cno) { |
| 332 | /* |
| 333 | * make the "clean" flag also to the opposite |
| 334 | * super block if both super blocks point to |
| 335 | * the same checkpoint. |
| 336 | */ |
| 337 | sbp[1]->s_state = sbp[0]->s_state; |
| 338 | flag = NILFS_SB_COMMIT_ALL; |
| 339 | } |
| 340 | ret = nilfs_commit_super(sbi, flag); |
Jiro SEKIBA | d26493b | 2010-06-28 17:49:32 +0900 | [diff] [blame] | 341 | } |
Ryusuke Konishi | 7ecaa46 | 2010-06-28 17:49:29 +0900 | [diff] [blame] | 342 | return ret; |
| 343 | } |
| 344 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 345 | static void nilfs_put_super(struct super_block *sb) |
| 346 | { |
| 347 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
| 348 | struct the_nilfs *nilfs = sbi->s_nilfs; |
| 349 | |
| 350 | nilfs_detach_segment_constructor(sbi); |
| 351 | |
| 352 | if (!(sb->s_flags & MS_RDONLY)) { |
| 353 | down_write(&nilfs->ns_sem); |
Ryusuke Konishi | 7ecaa46 | 2010-06-28 17:49:29 +0900 | [diff] [blame] | 354 | nilfs_cleanup_super(sbi); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 355 | up_write(&nilfs->ns_sem); |
| 356 | } |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 357 | down_write(&nilfs->ns_super_sem); |
Ryusuke Konishi | 3f82ff5 | 2009-06-08 01:39:30 +0900 | [diff] [blame] | 358 | if (nilfs->ns_current == sbi) |
| 359 | nilfs->ns_current = NULL; |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 360 | up_write(&nilfs->ns_super_sem); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 361 | |
| 362 | nilfs_detach_checkpoint(sbi); |
| 363 | put_nilfs(sbi->s_nilfs); |
| 364 | sbi->s_super = NULL; |
| 365 | sb->s_fs_info = NULL; |
Ryusuke Konishi | 6dd4740 | 2009-06-08 01:39:31 +0900 | [diff] [blame] | 366 | nilfs_put_sbinfo(sbi); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 367 | } |
| 368 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 369 | static int nilfs_sync_fs(struct super_block *sb, int wait) |
| 370 | { |
Jiro SEKIBA | 6233caa | 2009-07-23 01:26:33 +0900 | [diff] [blame] | 371 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
| 372 | struct the_nilfs *nilfs = sbi->s_nilfs; |
Jiro SEKIBA | d26493b | 2010-06-28 17:49:32 +0900 | [diff] [blame] | 373 | struct nilfs_super_block **sbp; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 374 | int err = 0; |
| 375 | |
| 376 | /* This function is called when super block should be written back */ |
| 377 | if (wait) |
| 378 | err = nilfs_construct_segment(sb); |
Jiro SEKIBA | 6233caa | 2009-07-23 01:26:33 +0900 | [diff] [blame] | 379 | |
| 380 | down_write(&nilfs->ns_sem); |
Jiro SEKIBA | d26493b | 2010-06-28 17:49:32 +0900 | [diff] [blame] | 381 | if (nilfs_sb_dirty(nilfs)) { |
Jiro SEKIBA | b2ac86e | 2010-06-28 17:49:33 +0900 | [diff] [blame] | 382 | sbp = nilfs_prepare_super(sbi, nilfs_sb_will_flip(nilfs)); |
| 383 | if (likely(sbp)) { |
| 384 | nilfs_set_log_cursor(sbp[0], nilfs); |
| 385 | nilfs_commit_super(sbi, NILFS_SB_COMMIT); |
| 386 | } |
Jiro SEKIBA | d26493b | 2010-06-28 17:49:32 +0900 | [diff] [blame] | 387 | } |
Jiro SEKIBA | 6233caa | 2009-07-23 01:26:33 +0900 | [diff] [blame] | 388 | up_write(&nilfs->ns_sem); |
| 389 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 390 | return err; |
| 391 | } |
| 392 | |
| 393 | int nilfs_attach_checkpoint(struct nilfs_sb_info *sbi, __u64 cno) |
| 394 | { |
| 395 | struct the_nilfs *nilfs = sbi->s_nilfs; |
| 396 | struct nilfs_checkpoint *raw_cp; |
| 397 | struct buffer_head *bh_cp; |
| 398 | int err; |
| 399 | |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 400 | down_write(&nilfs->ns_super_sem); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 401 | list_add(&sbi->s_list, &nilfs->ns_supers); |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 402 | up_write(&nilfs->ns_super_sem); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 403 | |
Ryusuke Konishi | af4e363 | 2010-08-13 12:42:24 +0900 | [diff] [blame] | 404 | err = -ENOMEM; |
Ryusuke Konishi | 7973956 | 2009-11-12 23:56:43 +0900 | [diff] [blame] | 405 | sbi->s_ifile = nilfs_ifile_new(sbi, nilfs->ns_inode_size); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 406 | if (!sbi->s_ifile) |
Ryusuke Konishi | af4e363 | 2010-08-13 12:42:24 +0900 | [diff] [blame] | 407 | goto delist; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 408 | |
Zhang Qiang | 1154ecb | 2009-08-18 14:58:24 +0800 | [diff] [blame] | 409 | down_read(&nilfs->ns_segctor_sem); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 410 | err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, cno, 0, &raw_cp, |
| 411 | &bh_cp); |
Zhang Qiang | 1154ecb | 2009-08-18 14:58:24 +0800 | [diff] [blame] | 412 | up_read(&nilfs->ns_segctor_sem); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 413 | if (unlikely(err)) { |
| 414 | if (err == -ENOENT || err == -EINVAL) { |
| 415 | printk(KERN_ERR |
| 416 | "NILFS: Invalid checkpoint " |
| 417 | "(checkpoint number=%llu)\n", |
| 418 | (unsigned long long)cno); |
| 419 | err = -EINVAL; |
| 420 | } |
| 421 | goto failed; |
| 422 | } |
| 423 | err = nilfs_read_inode_common(sbi->s_ifile, &raw_cp->cp_ifile_inode); |
| 424 | if (unlikely(err)) |
| 425 | goto failed_bh; |
| 426 | atomic_set(&sbi->s_inodes_count, le64_to_cpu(raw_cp->cp_inodes_count)); |
| 427 | atomic_set(&sbi->s_blocks_count, le64_to_cpu(raw_cp->cp_blocks_count)); |
| 428 | |
| 429 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); |
| 430 | return 0; |
| 431 | |
| 432 | failed_bh: |
| 433 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); |
| 434 | failed: |
| 435 | nilfs_mdt_destroy(sbi->s_ifile); |
| 436 | sbi->s_ifile = NULL; |
| 437 | |
Ryusuke Konishi | af4e363 | 2010-08-13 12:42:24 +0900 | [diff] [blame] | 438 | delist: |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 439 | down_write(&nilfs->ns_super_sem); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 440 | list_del_init(&sbi->s_list); |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 441 | up_write(&nilfs->ns_super_sem); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 442 | |
| 443 | return err; |
| 444 | } |
| 445 | |
| 446 | void nilfs_detach_checkpoint(struct nilfs_sb_info *sbi) |
| 447 | { |
| 448 | struct the_nilfs *nilfs = sbi->s_nilfs; |
| 449 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 450 | nilfs_mdt_destroy(sbi->s_ifile); |
| 451 | sbi->s_ifile = NULL; |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 452 | down_write(&nilfs->ns_super_sem); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 453 | list_del_init(&sbi->s_list); |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 454 | up_write(&nilfs->ns_super_sem); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 455 | } |
| 456 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 457 | static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
| 458 | { |
| 459 | struct super_block *sb = dentry->d_sb; |
| 460 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
Ryusuke Konishi | c306af2 | 2009-03-26 10:16:57 +0900 | [diff] [blame] | 461 | struct the_nilfs *nilfs = sbi->s_nilfs; |
| 462 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 463 | unsigned long long blocks; |
| 464 | unsigned long overhead; |
| 465 | unsigned long nrsvblocks; |
| 466 | sector_t nfreeblocks; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 467 | int err; |
| 468 | |
| 469 | /* |
| 470 | * Compute all of the segment blocks |
| 471 | * |
| 472 | * The blocks before first segment and after last segment |
| 473 | * are excluded. |
| 474 | */ |
| 475 | blocks = nilfs->ns_blocks_per_segment * nilfs->ns_nsegments |
| 476 | - nilfs->ns_first_data_block; |
| 477 | nrsvblocks = nilfs->ns_nrsvsegs * nilfs->ns_blocks_per_segment; |
| 478 | |
| 479 | /* |
| 480 | * Compute the overhead |
| 481 | * |
Ryusuke Konishi | 7a65004 | 2010-03-14 03:32:40 +0900 | [diff] [blame] | 482 | * When distributing meta data blocks outside segment structure, |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 483 | * We must count them as the overhead. |
| 484 | */ |
| 485 | overhead = 0; |
| 486 | |
| 487 | err = nilfs_count_free_blocks(nilfs, &nfreeblocks); |
| 488 | if (unlikely(err)) |
| 489 | return err; |
| 490 | |
| 491 | buf->f_type = NILFS_SUPER_MAGIC; |
| 492 | buf->f_bsize = sb->s_blocksize; |
| 493 | buf->f_blocks = blocks - overhead; |
| 494 | buf->f_bfree = nfreeblocks; |
| 495 | buf->f_bavail = (buf->f_bfree >= nrsvblocks) ? |
| 496 | (buf->f_bfree - nrsvblocks) : 0; |
| 497 | buf->f_files = atomic_read(&sbi->s_inodes_count); |
| 498 | buf->f_ffree = 0; /* nilfs_count_free_inodes(sb); */ |
| 499 | buf->f_namelen = NILFS_NAME_LEN; |
Ryusuke Konishi | c306af2 | 2009-03-26 10:16:57 +0900 | [diff] [blame] | 500 | buf->f_fsid.val[0] = (u32)id; |
| 501 | buf->f_fsid.val[1] = (u32)(id >> 32); |
| 502 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 503 | return 0; |
| 504 | } |
| 505 | |
Jiro SEKIBA | b58a285 | 2009-06-24 20:06:34 +0900 | [diff] [blame] | 506 | static int nilfs_show_options(struct seq_file *seq, struct vfsmount *vfs) |
| 507 | { |
| 508 | struct super_block *sb = vfs->mnt_sb; |
| 509 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
| 510 | |
| 511 | if (!nilfs_test_opt(sbi, BARRIER)) |
Ryusuke Konishi | c6b4d57 | 2010-07-05 14:40:27 +0900 | [diff] [blame] | 512 | seq_puts(seq, ",nobarrier"); |
Jiro SEKIBA | b58a285 | 2009-06-24 20:06:34 +0900 | [diff] [blame] | 513 | if (nilfs_test_opt(sbi, SNAPSHOT)) |
| 514 | seq_printf(seq, ",cp=%llu", |
| 515 | (unsigned long long int)sbi->s_snapshot_cno); |
Jiro SEKIBA | b58a285 | 2009-06-24 20:06:34 +0900 | [diff] [blame] | 516 | if (nilfs_test_opt(sbi, ERRORS_PANIC)) |
Ryusuke Konishi | c6b4d57 | 2010-07-05 14:40:27 +0900 | [diff] [blame] | 517 | seq_puts(seq, ",errors=panic"); |
Ryusuke Konishi | 277a6a3 | 2010-04-02 18:02:33 +0900 | [diff] [blame] | 518 | if (nilfs_test_opt(sbi, ERRORS_CONT)) |
Ryusuke Konishi | c6b4d57 | 2010-07-05 14:40:27 +0900 | [diff] [blame] | 519 | seq_puts(seq, ",errors=continue"); |
Jiro SEKIBA | b58a285 | 2009-06-24 20:06:34 +0900 | [diff] [blame] | 520 | if (nilfs_test_opt(sbi, STRICT_ORDER)) |
Ryusuke Konishi | c6b4d57 | 2010-07-05 14:40:27 +0900 | [diff] [blame] | 521 | seq_puts(seq, ",order=strict"); |
Ryusuke Konishi | 0234576 | 2009-11-20 03:28:01 +0900 | [diff] [blame] | 522 | if (nilfs_test_opt(sbi, NORECOVERY)) |
Ryusuke Konishi | c6b4d57 | 2010-07-05 14:40:27 +0900 | [diff] [blame] | 523 | seq_puts(seq, ",norecovery"); |
Jiro SEKIBA | e902ec9 | 2010-01-30 18:06:35 +0900 | [diff] [blame] | 524 | if (nilfs_test_opt(sbi, DISCARD)) |
Ryusuke Konishi | c6b4d57 | 2010-07-05 14:40:27 +0900 | [diff] [blame] | 525 | seq_puts(seq, ",discard"); |
Jiro SEKIBA | b58a285 | 2009-06-24 20:06:34 +0900 | [diff] [blame] | 526 | |
| 527 | return 0; |
| 528 | } |
| 529 | |
Alexey Dobriyan | b87221d | 2009-09-21 17:01:09 -0700 | [diff] [blame] | 530 | static const struct super_operations nilfs_sops = { |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 531 | .alloc_inode = nilfs_alloc_inode, |
| 532 | .destroy_inode = nilfs_destroy_inode, |
| 533 | .dirty_inode = nilfs_dirty_inode, |
| 534 | /* .write_inode = nilfs_write_inode, */ |
| 535 | /* .put_inode = nilfs_put_inode, */ |
| 536 | /* .drop_inode = nilfs_drop_inode, */ |
Al Viro | 6fd1e5c | 2010-06-07 11:55:00 -0400 | [diff] [blame] | 537 | .evict_inode = nilfs_evict_inode, |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 538 | .put_super = nilfs_put_super, |
Jiro SEKIBA | 1dfa271 | 2009-07-23 01:33:49 +0900 | [diff] [blame] | 539 | /* .write_super = nilfs_write_super, */ |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 540 | .sync_fs = nilfs_sync_fs, |
| 541 | /* .write_super_lockfs */ |
| 542 | /* .unlockfs */ |
| 543 | .statfs = nilfs_statfs, |
| 544 | .remount_fs = nilfs_remount, |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 545 | /* .umount_begin */ |
Jiro SEKIBA | b58a285 | 2009-06-24 20:06:34 +0900 | [diff] [blame] | 546 | .show_options = nilfs_show_options |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 547 | }; |
| 548 | |
| 549 | static struct inode * |
| 550 | nilfs_nfs_get_inode(struct super_block *sb, u64 ino, u32 generation) |
| 551 | { |
| 552 | struct inode *inode; |
| 553 | |
| 554 | if (ino < NILFS_FIRST_INO(sb) && ino != NILFS_ROOT_INO && |
| 555 | ino != NILFS_SKETCH_INO) |
| 556 | return ERR_PTR(-ESTALE); |
| 557 | |
| 558 | inode = nilfs_iget(sb, ino); |
| 559 | if (IS_ERR(inode)) |
| 560 | return ERR_CAST(inode); |
| 561 | if (generation && inode->i_generation != generation) { |
| 562 | iput(inode); |
| 563 | return ERR_PTR(-ESTALE); |
| 564 | } |
| 565 | |
| 566 | return inode; |
| 567 | } |
| 568 | |
| 569 | static struct dentry * |
| 570 | nilfs_fh_to_dentry(struct super_block *sb, struct fid *fid, int fh_len, |
| 571 | int fh_type) |
| 572 | { |
| 573 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, |
| 574 | nilfs_nfs_get_inode); |
| 575 | } |
| 576 | |
| 577 | static struct dentry * |
| 578 | nilfs_fh_to_parent(struct super_block *sb, struct fid *fid, int fh_len, |
| 579 | int fh_type) |
| 580 | { |
| 581 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, |
| 582 | nilfs_nfs_get_inode); |
| 583 | } |
| 584 | |
Alexey Dobriyan | ac4cfdd | 2009-09-21 17:01:10 -0700 | [diff] [blame] | 585 | static const struct export_operations nilfs_export_ops = { |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 586 | .fh_to_dentry = nilfs_fh_to_dentry, |
| 587 | .fh_to_parent = nilfs_fh_to_parent, |
| 588 | .get_parent = nilfs_get_parent, |
| 589 | }; |
| 590 | |
| 591 | enum { |
| 592 | Opt_err_cont, Opt_err_panic, Opt_err_ro, |
Ryusuke Konishi | 773bc4f | 2010-07-05 13:00:08 +0900 | [diff] [blame] | 593 | Opt_barrier, Opt_nobarrier, Opt_snapshot, Opt_order, Opt_norecovery, |
Ryusuke Konishi | 802d317 | 2010-07-05 14:27:04 +0900 | [diff] [blame] | 594 | Opt_discard, Opt_nodiscard, Opt_err, |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 595 | }; |
| 596 | |
| 597 | static match_table_t tokens = { |
| 598 | {Opt_err_cont, "errors=continue"}, |
| 599 | {Opt_err_panic, "errors=panic"}, |
| 600 | {Opt_err_ro, "errors=remount-ro"}, |
Ryusuke Konishi | 773bc4f | 2010-07-05 13:00:08 +0900 | [diff] [blame] | 601 | {Opt_barrier, "barrier"}, |
Jiro SEKIBA | 91f1953 | 2009-11-12 14:07:26 +0900 | [diff] [blame] | 602 | {Opt_nobarrier, "nobarrier"}, |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 603 | {Opt_snapshot, "cp=%u"}, |
| 604 | {Opt_order, "order=%s"}, |
Ryusuke Konishi | 0234576 | 2009-11-20 03:28:01 +0900 | [diff] [blame] | 605 | {Opt_norecovery, "norecovery"}, |
Jiro SEKIBA | e902ec9 | 2010-01-30 18:06:35 +0900 | [diff] [blame] | 606 | {Opt_discard, "discard"}, |
Ryusuke Konishi | 802d317 | 2010-07-05 14:27:04 +0900 | [diff] [blame] | 607 | {Opt_nodiscard, "nodiscard"}, |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 608 | {Opt_err, NULL} |
| 609 | }; |
| 610 | |
Ryusuke Konishi | 7c01745 | 2010-07-05 20:08:33 +0900 | [diff] [blame] | 611 | static int parse_options(char *options, struct super_block *sb, int is_remount) |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 612 | { |
| 613 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
| 614 | char *p; |
| 615 | substring_t args[MAX_OPT_ARGS]; |
| 616 | int option; |
| 617 | |
| 618 | if (!options) |
| 619 | return 1; |
| 620 | |
| 621 | while ((p = strsep(&options, ",")) != NULL) { |
| 622 | int token; |
| 623 | if (!*p) |
| 624 | continue; |
| 625 | |
| 626 | token = match_token(p, tokens, args); |
| 627 | switch (token) { |
Ryusuke Konishi | 773bc4f | 2010-07-05 13:00:08 +0900 | [diff] [blame] | 628 | case Opt_barrier: |
| 629 | nilfs_set_opt(sbi, BARRIER); |
| 630 | break; |
Jiro SEKIBA | 91f1953 | 2009-11-12 14:07:26 +0900 | [diff] [blame] | 631 | case Opt_nobarrier: |
| 632 | nilfs_clear_opt(sbi, BARRIER); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 633 | break; |
| 634 | case Opt_order: |
| 635 | if (strcmp(args[0].from, "relaxed") == 0) |
| 636 | /* Ordered data semantics */ |
| 637 | nilfs_clear_opt(sbi, STRICT_ORDER); |
| 638 | else if (strcmp(args[0].from, "strict") == 0) |
| 639 | /* Strict in-order semantics */ |
| 640 | nilfs_set_opt(sbi, STRICT_ORDER); |
| 641 | else |
| 642 | return 0; |
| 643 | break; |
| 644 | case Opt_err_panic: |
| 645 | nilfs_write_opt(sbi, ERROR_MODE, ERRORS_PANIC); |
| 646 | break; |
| 647 | case Opt_err_ro: |
| 648 | nilfs_write_opt(sbi, ERROR_MODE, ERRORS_RO); |
| 649 | break; |
| 650 | case Opt_err_cont: |
| 651 | nilfs_write_opt(sbi, ERROR_MODE, ERRORS_CONT); |
| 652 | break; |
| 653 | case Opt_snapshot: |
| 654 | if (match_int(&args[0], &option) || option <= 0) |
| 655 | return 0; |
Ryusuke Konishi | 7c01745 | 2010-07-05 20:08:33 +0900 | [diff] [blame] | 656 | if (is_remount) { |
| 657 | if (!nilfs_test_opt(sbi, SNAPSHOT)) { |
| 658 | printk(KERN_ERR |
| 659 | "NILFS: cannot change regular " |
| 660 | "mount to snapshot.\n"); |
| 661 | return 0; |
| 662 | } else if (option != sbi->s_snapshot_cno) { |
| 663 | printk(KERN_ERR |
| 664 | "NILFS: cannot remount to a " |
| 665 | "different snapshot.\n"); |
| 666 | return 0; |
| 667 | } |
| 668 | break; |
| 669 | } |
| 670 | if (!(sb->s_flags & MS_RDONLY)) { |
| 671 | printk(KERN_ERR "NILFS: cannot mount snapshot " |
| 672 | "read/write. A read-only option is " |
| 673 | "required.\n"); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 674 | return 0; |
Ryusuke Konishi | 7c01745 | 2010-07-05 20:08:33 +0900 | [diff] [blame] | 675 | } |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 676 | sbi->s_snapshot_cno = option; |
| 677 | nilfs_set_opt(sbi, SNAPSHOT); |
| 678 | break; |
Ryusuke Konishi | 0234576 | 2009-11-20 03:28:01 +0900 | [diff] [blame] | 679 | case Opt_norecovery: |
| 680 | nilfs_set_opt(sbi, NORECOVERY); |
| 681 | break; |
Jiro SEKIBA | e902ec9 | 2010-01-30 18:06:35 +0900 | [diff] [blame] | 682 | case Opt_discard: |
| 683 | nilfs_set_opt(sbi, DISCARD); |
| 684 | break; |
Ryusuke Konishi | 802d317 | 2010-07-05 14:27:04 +0900 | [diff] [blame] | 685 | case Opt_nodiscard: |
| 686 | nilfs_clear_opt(sbi, DISCARD); |
| 687 | break; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 688 | default: |
| 689 | printk(KERN_ERR |
| 690 | "NILFS: Unrecognized mount option \"%s\"\n", p); |
| 691 | return 0; |
| 692 | } |
| 693 | } |
| 694 | return 1; |
| 695 | } |
| 696 | |
| 697 | static inline void |
| 698 | nilfs_set_default_options(struct nilfs_sb_info *sbi, |
| 699 | struct nilfs_super_block *sbp) |
| 700 | { |
| 701 | sbi->s_mount_opt = |
Ryusuke Konishi | 277a6a3 | 2010-04-02 18:02:33 +0900 | [diff] [blame] | 702 | NILFS_MOUNT_ERRORS_RO | NILFS_MOUNT_BARRIER; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 703 | } |
| 704 | |
| 705 | static int nilfs_setup_super(struct nilfs_sb_info *sbi) |
| 706 | { |
| 707 | struct the_nilfs *nilfs = sbi->s_nilfs; |
Jiro SEKIBA | d26493b | 2010-06-28 17:49:32 +0900 | [diff] [blame] | 708 | struct nilfs_super_block **sbp; |
| 709 | int max_mnt_count; |
| 710 | int mnt_count; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 711 | |
Jiro SEKIBA | d26493b | 2010-06-28 17:49:32 +0900 | [diff] [blame] | 712 | /* nilfs->ns_sem must be locked by the caller. */ |
Jiro SEKIBA | b2ac86e | 2010-06-28 17:49:33 +0900 | [diff] [blame] | 713 | sbp = nilfs_prepare_super(sbi, 0); |
Jiro SEKIBA | d26493b | 2010-06-28 17:49:32 +0900 | [diff] [blame] | 714 | if (!sbp) |
| 715 | return -EIO; |
| 716 | |
| 717 | max_mnt_count = le16_to_cpu(sbp[0]->s_max_mnt_count); |
| 718 | mnt_count = le16_to_cpu(sbp[0]->s_mnt_count); |
| 719 | |
Ryusuke Konishi | f50a4c8 | 2009-11-19 16:58:40 +0900 | [diff] [blame] | 720 | if (nilfs->ns_mount_state & NILFS_ERROR_FS) { |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 721 | printk(KERN_WARNING |
| 722 | "NILFS warning: mounting fs with errors\n"); |
| 723 | #if 0 |
| 724 | } else if (max_mnt_count >= 0 && mnt_count >= max_mnt_count) { |
| 725 | printk(KERN_WARNING |
| 726 | "NILFS warning: maximal mount count reached\n"); |
| 727 | #endif |
| 728 | } |
| 729 | if (!max_mnt_count) |
Jiro SEKIBA | d26493b | 2010-06-28 17:49:32 +0900 | [diff] [blame] | 730 | sbp[0]->s_max_mnt_count = cpu_to_le16(NILFS_DFL_MAX_MNT_COUNT); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 731 | |
Jiro SEKIBA | d26493b | 2010-06-28 17:49:32 +0900 | [diff] [blame] | 732 | sbp[0]->s_mnt_count = cpu_to_le16(mnt_count + 1); |
| 733 | sbp[0]->s_state = |
| 734 | cpu_to_le16(le16_to_cpu(sbp[0]->s_state) & ~NILFS_VALID_FS); |
| 735 | sbp[0]->s_mtime = cpu_to_le64(get_seconds()); |
Jiro SEKIBA | b2ac86e | 2010-06-28 17:49:33 +0900 | [diff] [blame] | 736 | /* synchronize sbp[1] with sbp[0] */ |
| 737 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); |
| 738 | return nilfs_commit_super(sbi, NILFS_SB_COMMIT_ALL); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 739 | } |
| 740 | |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 741 | struct nilfs_super_block *nilfs_read_super_block(struct super_block *sb, |
| 742 | u64 pos, int blocksize, |
| 743 | struct buffer_head **pbh) |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 744 | { |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 745 | unsigned long long sb_index = pos; |
| 746 | unsigned long offset; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 747 | |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 748 | offset = do_div(sb_index, blocksize); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 749 | *pbh = sb_bread(sb, sb_index); |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 750 | if (!*pbh) |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 751 | return NULL; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 752 | return (struct nilfs_super_block *)((char *)(*pbh)->b_data + offset); |
| 753 | } |
| 754 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 755 | int nilfs_store_magic_and_option(struct super_block *sb, |
| 756 | struct nilfs_super_block *sbp, |
| 757 | char *data) |
| 758 | { |
| 759 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
| 760 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 761 | sb->s_magic = le16_to_cpu(sbp->s_magic); |
| 762 | |
| 763 | /* FS independent flags */ |
| 764 | #ifdef NILFS_ATIME_DISABLE |
| 765 | sb->s_flags |= MS_NOATIME; |
| 766 | #endif |
| 767 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 768 | nilfs_set_default_options(sbi, sbp); |
| 769 | |
| 770 | sbi->s_resuid = le16_to_cpu(sbp->s_def_resuid); |
| 771 | sbi->s_resgid = le16_to_cpu(sbp->s_def_resgid); |
| 772 | sbi->s_interval = le32_to_cpu(sbp->s_c_interval); |
| 773 | sbi->s_watermark = le32_to_cpu(sbp->s_c_block_max); |
| 774 | |
Ryusuke Konishi | 7c01745 | 2010-07-05 20:08:33 +0900 | [diff] [blame] | 775 | return !parse_options(data, sb, 0) ? -EINVAL : 0 ; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 776 | } |
| 777 | |
Ryusuke Konishi | c5ca48a | 2010-07-22 03:22:20 +0900 | [diff] [blame] | 778 | int nilfs_check_feature_compatibility(struct super_block *sb, |
| 779 | struct nilfs_super_block *sbp) |
| 780 | { |
| 781 | __u64 features; |
| 782 | |
| 783 | features = le64_to_cpu(sbp->s_feature_incompat) & |
| 784 | ~NILFS_FEATURE_INCOMPAT_SUPP; |
| 785 | if (features) { |
| 786 | printk(KERN_ERR "NILFS: couldn't mount because of unsupported " |
| 787 | "optional features (%llx)\n", |
| 788 | (unsigned long long)features); |
| 789 | return -EINVAL; |
| 790 | } |
| 791 | features = le64_to_cpu(sbp->s_feature_compat_ro) & |
| 792 | ~NILFS_FEATURE_COMPAT_RO_SUPP; |
| 793 | if (!(sb->s_flags & MS_RDONLY) && features) { |
| 794 | printk(KERN_ERR "NILFS: couldn't mount RDWR because of " |
| 795 | "unsupported optional features (%llx)\n", |
| 796 | (unsigned long long)features); |
| 797 | return -EINVAL; |
| 798 | } |
| 799 | return 0; |
| 800 | } |
| 801 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 802 | /** |
| 803 | * nilfs_fill_super() - initialize a super block instance |
| 804 | * @sb: super_block |
| 805 | * @data: mount options |
| 806 | * @silent: silent mode flag |
| 807 | * @nilfs: the_nilfs struct |
| 808 | * |
Ryusuke Konishi | aa7dfb8 | 2009-06-08 01:39:33 +0900 | [diff] [blame] | 809 | * This function is called exclusively by nilfs->ns_mount_mutex. |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 810 | * So, the recovery process is protected from other simultaneous mounts. |
| 811 | */ |
| 812 | static int |
| 813 | nilfs_fill_super(struct super_block *sb, void *data, int silent, |
| 814 | struct the_nilfs *nilfs) |
| 815 | { |
| 816 | struct nilfs_sb_info *sbi; |
| 817 | struct inode *root; |
| 818 | __u64 cno; |
| 819 | int err; |
| 820 | |
| 821 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); |
| 822 | if (!sbi) |
| 823 | return -ENOMEM; |
| 824 | |
| 825 | sb->s_fs_info = sbi; |
| 826 | |
| 827 | get_nilfs(nilfs); |
| 828 | sbi->s_nilfs = nilfs; |
| 829 | sbi->s_super = sb; |
Ryusuke Konishi | 6dd4740 | 2009-06-08 01:39:31 +0900 | [diff] [blame] | 830 | atomic_set(&sbi->s_count, 1); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 831 | |
| 832 | err = init_nilfs(nilfs, sbi, (char *)data); |
| 833 | if (err) |
| 834 | goto failed_sbi; |
| 835 | |
| 836 | spin_lock_init(&sbi->s_inode_lock); |
| 837 | INIT_LIST_HEAD(&sbi->s_dirty_files); |
| 838 | INIT_LIST_HEAD(&sbi->s_list); |
| 839 | |
| 840 | /* |
| 841 | * Following initialization is overlapped because |
| 842 | * nilfs_sb_info structure has been cleared at the beginning. |
| 843 | * But we reserve them to keep our interest and make ready |
| 844 | * for the future change. |
| 845 | */ |
| 846 | get_random_bytes(&sbi->s_next_generation, |
| 847 | sizeof(sbi->s_next_generation)); |
| 848 | spin_lock_init(&sbi->s_next_gen_lock); |
| 849 | |
| 850 | sb->s_op = &nilfs_sops; |
| 851 | sb->s_export_op = &nilfs_export_ops; |
| 852 | sb->s_root = NULL; |
Ryusuke Konishi | 6123923 | 2009-04-06 19:02:00 -0700 | [diff] [blame] | 853 | sb->s_time_gran = 1; |
Ryusuke Konishi | 973bec3 | 2010-05-03 21:00:48 +0900 | [diff] [blame] | 854 | sb->s_bdi = nilfs->ns_bdi; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 855 | |
Ryusuke Konishi | f50a4c8 | 2009-11-19 16:58:40 +0900 | [diff] [blame] | 856 | err = load_nilfs(nilfs, sbi); |
| 857 | if (err) |
| 858 | goto failed_sbi; |
| 859 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 860 | cno = nilfs_last_cno(nilfs); |
| 861 | |
| 862 | if (sb->s_flags & MS_RDONLY) { |
| 863 | if (nilfs_test_opt(sbi, SNAPSHOT)) { |
Zhu Yanhai | 43be0ec | 2009-08-12 14:17:59 +0800 | [diff] [blame] | 864 | down_read(&nilfs->ns_segctor_sem); |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 865 | err = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile, |
| 866 | sbi->s_snapshot_cno); |
Zhu Yanhai | 43be0ec | 2009-08-12 14:17:59 +0800 | [diff] [blame] | 867 | up_read(&nilfs->ns_segctor_sem); |
| 868 | if (err < 0) { |
| 869 | if (err == -ENOENT) |
| 870 | err = -EINVAL; |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 871 | goto failed_sbi; |
Zhu Yanhai | 43be0ec | 2009-08-12 14:17:59 +0800 | [diff] [blame] | 872 | } |
Ryusuke Konishi | 1f5abe7 | 2009-04-06 19:01:55 -0700 | [diff] [blame] | 873 | if (!err) { |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 874 | printk(KERN_ERR |
| 875 | "NILFS: The specified checkpoint is " |
| 876 | "not a snapshot " |
| 877 | "(checkpoint number=%llu).\n", |
| 878 | (unsigned long long)sbi->s_snapshot_cno); |
| 879 | err = -EINVAL; |
| 880 | goto failed_sbi; |
| 881 | } |
| 882 | cno = sbi->s_snapshot_cno; |
Ryusuke Konishi | d240e06 | 2010-05-09 21:51:53 +0900 | [diff] [blame] | 883 | } |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 884 | } |
| 885 | |
| 886 | err = nilfs_attach_checkpoint(sbi, cno); |
| 887 | if (err) { |
| 888 | printk(KERN_ERR "NILFS: error loading a checkpoint" |
| 889 | " (checkpoint number=%llu).\n", (unsigned long long)cno); |
| 890 | goto failed_sbi; |
| 891 | } |
| 892 | |
| 893 | if (!(sb->s_flags & MS_RDONLY)) { |
Ryusuke Konishi | cece552 | 2009-04-06 19:01:58 -0700 | [diff] [blame] | 894 | err = nilfs_attach_segment_constructor(sbi); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 895 | if (err) |
| 896 | goto failed_checkpoint; |
| 897 | } |
| 898 | |
| 899 | root = nilfs_iget(sb, NILFS_ROOT_INO); |
| 900 | if (IS_ERR(root)) { |
| 901 | printk(KERN_ERR "NILFS: get root inode failed\n"); |
| 902 | err = PTR_ERR(root); |
| 903 | goto failed_segctor; |
| 904 | } |
| 905 | if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { |
| 906 | iput(root); |
| 907 | printk(KERN_ERR "NILFS: corrupt root inode.\n"); |
| 908 | err = -EINVAL; |
| 909 | goto failed_segctor; |
| 910 | } |
| 911 | sb->s_root = d_alloc_root(root); |
| 912 | if (!sb->s_root) { |
| 913 | iput(root); |
| 914 | printk(KERN_ERR "NILFS: get root dentry failed\n"); |
| 915 | err = -ENOMEM; |
| 916 | goto failed_segctor; |
| 917 | } |
| 918 | |
| 919 | if (!(sb->s_flags & MS_RDONLY)) { |
| 920 | down_write(&nilfs->ns_sem); |
| 921 | nilfs_setup_super(sbi); |
| 922 | up_write(&nilfs->ns_sem); |
| 923 | } |
| 924 | |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 925 | down_write(&nilfs->ns_super_sem); |
Ryusuke Konishi | 3f82ff5 | 2009-06-08 01:39:30 +0900 | [diff] [blame] | 926 | if (!nilfs_test_opt(sbi, SNAPSHOT)) |
| 927 | nilfs->ns_current = sbi; |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 928 | up_write(&nilfs->ns_super_sem); |
Ryusuke Konishi | 3f82ff5 | 2009-06-08 01:39:30 +0900 | [diff] [blame] | 929 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 930 | return 0; |
| 931 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 932 | failed_segctor: |
| 933 | nilfs_detach_segment_constructor(sbi); |
| 934 | |
| 935 | failed_checkpoint: |
| 936 | nilfs_detach_checkpoint(sbi); |
| 937 | |
| 938 | failed_sbi: |
| 939 | put_nilfs(nilfs); |
| 940 | sb->s_fs_info = NULL; |
Ryusuke Konishi | 6dd4740 | 2009-06-08 01:39:31 +0900 | [diff] [blame] | 941 | nilfs_put_sbinfo(sbi); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 942 | return err; |
| 943 | } |
| 944 | |
| 945 | static int nilfs_remount(struct super_block *sb, int *flags, char *data) |
| 946 | { |
| 947 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 948 | struct the_nilfs *nilfs = sbi->s_nilfs; |
| 949 | unsigned long old_sb_flags; |
| 950 | struct nilfs_mount_options old_opts; |
Ryusuke Konishi | d240e06 | 2010-05-09 21:51:53 +0900 | [diff] [blame] | 951 | int was_snapshot, err; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 952 | |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 953 | down_write(&nilfs->ns_super_sem); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 954 | old_sb_flags = sb->s_flags; |
| 955 | old_opts.mount_opt = sbi->s_mount_opt; |
| 956 | old_opts.snapshot_cno = sbi->s_snapshot_cno; |
Ryusuke Konishi | d240e06 | 2010-05-09 21:51:53 +0900 | [diff] [blame] | 957 | was_snapshot = nilfs_test_opt(sbi, SNAPSHOT); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 958 | |
Ryusuke Konishi | 7c01745 | 2010-07-05 20:08:33 +0900 | [diff] [blame] | 959 | if (!parse_options(data, sb, 1)) { |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 960 | err = -EINVAL; |
| 961 | goto restore_opts; |
| 962 | } |
| 963 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL); |
| 964 | |
Ryusuke Konishi | d240e06 | 2010-05-09 21:51:53 +0900 | [diff] [blame] | 965 | err = -EINVAL; |
Ryusuke Konishi | 7c01745 | 2010-07-05 20:08:33 +0900 | [diff] [blame] | 966 | if (was_snapshot && !(*flags & MS_RDONLY)) { |
| 967 | printk(KERN_ERR "NILFS (device %s): cannot remount snapshot " |
| 968 | "read/write.\n", sb->s_id); |
| 969 | goto restore_opts; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 970 | } |
| 971 | |
Ryusuke Konishi | 0234576 | 2009-11-20 03:28:01 +0900 | [diff] [blame] | 972 | if (!nilfs_valid_fs(nilfs)) { |
| 973 | printk(KERN_WARNING "NILFS (device %s): couldn't " |
| 974 | "remount because the filesystem is in an " |
| 975 | "incomplete recovery state.\n", sb->s_id); |
Ryusuke Konishi | 0234576 | 2009-11-20 03:28:01 +0900 | [diff] [blame] | 976 | goto restore_opts; |
| 977 | } |
| 978 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 979 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
| 980 | goto out; |
| 981 | if (*flags & MS_RDONLY) { |
| 982 | /* Shutting down the segment constructor */ |
| 983 | nilfs_detach_segment_constructor(sbi); |
| 984 | sb->s_flags |= MS_RDONLY; |
| 985 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 986 | /* |
| 987 | * Remounting a valid RW partition RDONLY, so set |
| 988 | * the RDONLY flag and then mark the partition as valid again. |
| 989 | */ |
| 990 | down_write(&nilfs->ns_sem); |
Ryusuke Konishi | 7ecaa46 | 2010-06-28 17:49:29 +0900 | [diff] [blame] | 991 | nilfs_cleanup_super(sbi); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 992 | up_write(&nilfs->ns_sem); |
| 993 | } else { |
Ryusuke Konishi | c5ca48a | 2010-07-22 03:22:20 +0900 | [diff] [blame] | 994 | __u64 features; |
| 995 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 996 | /* |
| 997 | * Mounting a RDONLY partition read-write, so reread and |
| 998 | * store the current valid flag. (It may have been changed |
| 999 | * by fsck since we originally mounted the partition.) |
| 1000 | */ |
Ryusuke Konishi | c5ca48a | 2010-07-22 03:22:20 +0900 | [diff] [blame] | 1001 | down_read(&nilfs->ns_sem); |
| 1002 | features = le64_to_cpu(nilfs->ns_sbp[0]->s_feature_compat_ro) & |
| 1003 | ~NILFS_FEATURE_COMPAT_RO_SUPP; |
| 1004 | up_read(&nilfs->ns_sem); |
| 1005 | if (features) { |
| 1006 | printk(KERN_WARNING "NILFS (device %s): couldn't " |
| 1007 | "remount RDWR because of unsupported optional " |
| 1008 | "features (%llx)\n", |
| 1009 | sb->s_id, (unsigned long long)features); |
| 1010 | err = -EROFS; |
| 1011 | goto restore_opts; |
| 1012 | } |
| 1013 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1014 | sb->s_flags &= ~MS_RDONLY; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1015 | |
Ryusuke Konishi | cece552 | 2009-04-06 19:01:58 -0700 | [diff] [blame] | 1016 | err = nilfs_attach_segment_constructor(sbi); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1017 | if (err) |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 1018 | goto restore_opts; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1019 | |
| 1020 | down_write(&nilfs->ns_sem); |
| 1021 | nilfs_setup_super(sbi); |
| 1022 | up_write(&nilfs->ns_sem); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1023 | } |
| 1024 | out: |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 1025 | up_write(&nilfs->ns_super_sem); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1026 | return 0; |
| 1027 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1028 | restore_opts: |
| 1029 | sb->s_flags = old_sb_flags; |
| 1030 | sbi->s_mount_opt = old_opts.mount_opt; |
| 1031 | sbi->s_snapshot_cno = old_opts.snapshot_cno; |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 1032 | up_write(&nilfs->ns_super_sem); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1033 | return err; |
| 1034 | } |
| 1035 | |
| 1036 | struct nilfs_super_data { |
| 1037 | struct block_device *bdev; |
Ryusuke Konishi | 6dd4740 | 2009-06-08 01:39:31 +0900 | [diff] [blame] | 1038 | struct nilfs_sb_info *sbi; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1039 | __u64 cno; |
| 1040 | int flags; |
| 1041 | }; |
| 1042 | |
| 1043 | /** |
| 1044 | * nilfs_identify - pre-read mount options needed to identify mount instance |
| 1045 | * @data: mount options |
| 1046 | * @sd: nilfs_super_data |
| 1047 | */ |
| 1048 | static int nilfs_identify(char *data, struct nilfs_super_data *sd) |
| 1049 | { |
| 1050 | char *p, *options = data; |
| 1051 | substring_t args[MAX_OPT_ARGS]; |
| 1052 | int option, token; |
| 1053 | int ret = 0; |
| 1054 | |
| 1055 | do { |
| 1056 | p = strsep(&options, ","); |
| 1057 | if (p != NULL && *p) { |
| 1058 | token = match_token(p, tokens, args); |
| 1059 | if (token == Opt_snapshot) { |
| 1060 | if (!(sd->flags & MS_RDONLY)) |
| 1061 | ret++; |
| 1062 | else { |
| 1063 | ret = match_int(&args[0], &option); |
| 1064 | if (!ret) { |
| 1065 | if (option > 0) |
| 1066 | sd->cno = option; |
| 1067 | else |
| 1068 | ret++; |
| 1069 | } |
| 1070 | } |
| 1071 | } |
| 1072 | if (ret) |
| 1073 | printk(KERN_ERR |
| 1074 | "NILFS: invalid mount option: %s\n", p); |
| 1075 | } |
| 1076 | if (!options) |
| 1077 | break; |
| 1078 | BUG_ON(options == data); |
| 1079 | *(options - 1) = ','; |
| 1080 | } while (!ret); |
| 1081 | return ret; |
| 1082 | } |
| 1083 | |
| 1084 | static int nilfs_set_bdev_super(struct super_block *s, void *data) |
| 1085 | { |
| 1086 | struct nilfs_super_data *sd = data; |
| 1087 | |
| 1088 | s->s_bdev = sd->bdev; |
| 1089 | s->s_dev = s->s_bdev->bd_dev; |
| 1090 | return 0; |
| 1091 | } |
| 1092 | |
| 1093 | static int nilfs_test_bdev_super(struct super_block *s, void *data) |
| 1094 | { |
| 1095 | struct nilfs_super_data *sd = data; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1096 | |
Ryusuke Konishi | 6dd4740 | 2009-06-08 01:39:31 +0900 | [diff] [blame] | 1097 | return sd->sbi && s->s_fs_info == (void *)sd->sbi; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1098 | } |
| 1099 | |
| 1100 | static int |
| 1101 | nilfs_get_sb(struct file_system_type *fs_type, int flags, |
| 1102 | const char *dev_name, void *data, struct vfsmount *mnt) |
| 1103 | { |
| 1104 | struct nilfs_super_data sd; |
Ryusuke Konishi | 33c8e57 | 2009-06-08 01:39:29 +0900 | [diff] [blame] | 1105 | struct super_block *s; |
Ryusuke Konishi | 13e9055 | 2010-05-09 02:57:57 +0900 | [diff] [blame] | 1106 | fmode_t mode = FMODE_READ; |
Ryusuke Konishi | 33c8e57 | 2009-06-08 01:39:29 +0900 | [diff] [blame] | 1107 | struct the_nilfs *nilfs; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1108 | int err, need_to_close = 1; |
| 1109 | |
Ryusuke Konishi | 13e9055 | 2010-05-09 02:57:57 +0900 | [diff] [blame] | 1110 | if (!(flags & MS_RDONLY)) |
| 1111 | mode |= FMODE_WRITE; |
| 1112 | |
| 1113 | sd.bdev = open_bdev_exclusive(dev_name, mode, fs_type); |
Jan Blunck | d6d4c19 | 2010-02-24 13:25:32 +0100 | [diff] [blame] | 1114 | if (IS_ERR(sd.bdev)) |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1115 | return PTR_ERR(sd.bdev); |
| 1116 | |
| 1117 | /* |
| 1118 | * To get mount instance using sget() vfs-routine, NILFS needs |
| 1119 | * much more information than normal filesystems to identify mount |
| 1120 | * instance. For snapshot mounts, not only a mount type (ro-mount |
| 1121 | * or rw-mount) but also a checkpoint number is required. |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1122 | */ |
| 1123 | sd.cno = 0; |
| 1124 | sd.flags = flags; |
| 1125 | if (nilfs_identify((char *)data, &sd)) { |
| 1126 | err = -EINVAL; |
| 1127 | goto failed; |
| 1128 | } |
| 1129 | |
Ryusuke Konishi | 33c8e57 | 2009-06-08 01:39:29 +0900 | [diff] [blame] | 1130 | nilfs = find_or_create_nilfs(sd.bdev); |
| 1131 | if (!nilfs) { |
| 1132 | err = -ENOMEM; |
| 1133 | goto failed; |
| 1134 | } |
| 1135 | |
Ryusuke Konishi | aa7dfb8 | 2009-06-08 01:39:33 +0900 | [diff] [blame] | 1136 | mutex_lock(&nilfs->ns_mount_mutex); |
Ryusuke Konishi | 3f82ff5 | 2009-06-08 01:39:30 +0900 | [diff] [blame] | 1137 | |
| 1138 | if (!sd.cno) { |
| 1139 | /* |
| 1140 | * Check if an exclusive mount exists or not. |
| 1141 | * Snapshot mounts coexist with a current mount |
| 1142 | * (i.e. rw-mount or ro-mount), whereas rw-mount and |
| 1143 | * ro-mount are mutually exclusive. |
| 1144 | */ |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 1145 | down_read(&nilfs->ns_super_sem); |
Ryusuke Konishi | 3f82ff5 | 2009-06-08 01:39:30 +0900 | [diff] [blame] | 1146 | if (nilfs->ns_current && |
| 1147 | ((nilfs->ns_current->s_super->s_flags ^ flags) |
| 1148 | & MS_RDONLY)) { |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 1149 | up_read(&nilfs->ns_super_sem); |
Ryusuke Konishi | 3f82ff5 | 2009-06-08 01:39:30 +0900 | [diff] [blame] | 1150 | err = -EBUSY; |
| 1151 | goto failed_unlock; |
| 1152 | } |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 1153 | up_read(&nilfs->ns_super_sem); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1154 | } |
| 1155 | |
| 1156 | /* |
Ryusuke Konishi | 6dd4740 | 2009-06-08 01:39:31 +0900 | [diff] [blame] | 1157 | * Find existing nilfs_sb_info struct |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1158 | */ |
Ryusuke Konishi | 6dd4740 | 2009-06-08 01:39:31 +0900 | [diff] [blame] | 1159 | sd.sbi = nilfs_find_sbinfo(nilfs, !(flags & MS_RDONLY), sd.cno); |
| 1160 | |
Ryusuke Konishi | 6dd4740 | 2009-06-08 01:39:31 +0900 | [diff] [blame] | 1161 | /* |
| 1162 | * Get super block instance holding the nilfs_sb_info struct. |
| 1163 | * A new instance is allocated if no existing mount is present or |
| 1164 | * existing instance has been unmounted. |
| 1165 | */ |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1166 | 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] | 1167 | if (sd.sbi) |
| 1168 | nilfs_put_sbinfo(sd.sbi); |
| 1169 | |
Ryusuke Konishi | 33c8e57 | 2009-06-08 01:39:29 +0900 | [diff] [blame] | 1170 | if (IS_ERR(s)) { |
| 1171 | err = PTR_ERR(s); |
| 1172 | goto failed_unlock; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1173 | } |
| 1174 | |
| 1175 | if (!s->s_root) { |
| 1176 | char b[BDEVNAME_SIZE]; |
| 1177 | |
Ryusuke Konishi | 33c8e57 | 2009-06-08 01:39:29 +0900 | [diff] [blame] | 1178 | /* New superblock instance created */ |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1179 | s->s_flags = flags; |
Ryusuke Konishi | 4571b82 | 2010-05-09 03:01:32 +0900 | [diff] [blame] | 1180 | s->s_mode = mode; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1181 | strlcpy(s->s_id, bdevname(sd.bdev, b), sizeof(s->s_id)); |
| 1182 | sb_set_blocksize(s, block_size(sd.bdev)); |
| 1183 | |
Ryusuke Konishi | e2d1591 | 2010-05-09 09:48:31 +0900 | [diff] [blame] | 1184 | err = nilfs_fill_super(s, data, flags & MS_SILENT ? 1 : 0, |
| 1185 | nilfs); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1186 | if (err) |
| 1187 | goto cancel_new; |
| 1188 | |
| 1189 | s->s_flags |= MS_ACTIVE; |
| 1190 | need_to_close = 0; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1191 | } |
| 1192 | |
Ryusuke Konishi | aa7dfb8 | 2009-06-08 01:39:33 +0900 | [diff] [blame] | 1193 | mutex_unlock(&nilfs->ns_mount_mutex); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1194 | put_nilfs(nilfs); |
| 1195 | if (need_to_close) |
Ryusuke Konishi | 13e9055 | 2010-05-09 02:57:57 +0900 | [diff] [blame] | 1196 | close_bdev_exclusive(sd.bdev, mode); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1197 | simple_set_mnt(mnt, s); |
| 1198 | return 0; |
| 1199 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1200 | failed_unlock: |
Ryusuke Konishi | aa7dfb8 | 2009-06-08 01:39:33 +0900 | [diff] [blame] | 1201 | mutex_unlock(&nilfs->ns_mount_mutex); |
Ryusuke Konishi | 33c8e57 | 2009-06-08 01:39:29 +0900 | [diff] [blame] | 1202 | put_nilfs(nilfs); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1203 | failed: |
Ryusuke Konishi | 13e9055 | 2010-05-09 02:57:57 +0900 | [diff] [blame] | 1204 | close_bdev_exclusive(sd.bdev, mode); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1205 | return err; |
| 1206 | |
| 1207 | cancel_new: |
| 1208 | /* Abandoning the newly allocated superblock */ |
Ryusuke Konishi | aa7dfb8 | 2009-06-08 01:39:33 +0900 | [diff] [blame] | 1209 | mutex_unlock(&nilfs->ns_mount_mutex); |
Ryusuke Konishi | 33c8e57 | 2009-06-08 01:39:29 +0900 | [diff] [blame] | 1210 | put_nilfs(nilfs); |
Al Viro | a95161a | 2009-08-09 00:52:02 +0400 | [diff] [blame] | 1211 | deactivate_locked_super(s); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1212 | /* |
Ryusuke Konishi | b87ca91 | 2010-05-09 10:05:21 +0900 | [diff] [blame] | 1213 | * deactivate_locked_super() invokes close_bdev_exclusive(). |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1214 | * We must finish all post-cleaning before this call; |
Ryusuke Konishi | aa7dfb8 | 2009-06-08 01:39:33 +0900 | [diff] [blame] | 1215 | * put_nilfs() needs the block device. |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1216 | */ |
| 1217 | return err; |
| 1218 | } |
| 1219 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1220 | struct file_system_type nilfs_fs_type = { |
| 1221 | .owner = THIS_MODULE, |
| 1222 | .name = "nilfs2", |
| 1223 | .get_sb = nilfs_get_sb, |
| 1224 | .kill_sb = kill_block_super, |
| 1225 | .fs_flags = FS_REQUIRES_DEV, |
| 1226 | }; |
| 1227 | |
Li Hong | 41c88bd | 2010-04-06 00:54:11 +0800 | [diff] [blame] | 1228 | static void nilfs_inode_init_once(void *obj) |
| 1229 | { |
| 1230 | struct nilfs_inode_info *ii = obj; |
| 1231 | |
| 1232 | INIT_LIST_HEAD(&ii->i_dirty); |
| 1233 | #ifdef CONFIG_NILFS_XATTR |
| 1234 | init_rwsem(&ii->xattr_sem); |
| 1235 | #endif |
| 1236 | nilfs_btnode_cache_init_once(&ii->i_btnode_cache); |
Ryusuke Konishi | 05d0e94 | 2010-07-10 20:52:09 +0900 | [diff] [blame] | 1237 | ii->i_bmap = &ii->i_bmap_data; |
Li Hong | 41c88bd | 2010-04-06 00:54:11 +0800 | [diff] [blame] | 1238 | inode_init_once(&ii->vfs_inode); |
| 1239 | } |
| 1240 | |
| 1241 | static void nilfs_segbuf_init_once(void *obj) |
| 1242 | { |
| 1243 | memset(obj, 0, sizeof(struct nilfs_segment_buffer)); |
| 1244 | } |
| 1245 | |
| 1246 | static void nilfs_destroy_cachep(void) |
| 1247 | { |
Ryusuke Konishi | 84cb099 | 2010-05-22 12:49:32 +0900 | [diff] [blame] | 1248 | if (nilfs_inode_cachep) |
Li Hong | 41c88bd | 2010-04-06 00:54:11 +0800 | [diff] [blame] | 1249 | kmem_cache_destroy(nilfs_inode_cachep); |
Ryusuke Konishi | 84cb099 | 2010-05-22 12:49:32 +0900 | [diff] [blame] | 1250 | if (nilfs_transaction_cachep) |
Li Hong | 41c88bd | 2010-04-06 00:54:11 +0800 | [diff] [blame] | 1251 | kmem_cache_destroy(nilfs_transaction_cachep); |
Ryusuke Konishi | 84cb099 | 2010-05-22 12:49:32 +0900 | [diff] [blame] | 1252 | if (nilfs_segbuf_cachep) |
Li Hong | 41c88bd | 2010-04-06 00:54:11 +0800 | [diff] [blame] | 1253 | kmem_cache_destroy(nilfs_segbuf_cachep); |
Ryusuke Konishi | 84cb099 | 2010-05-22 12:49:32 +0900 | [diff] [blame] | 1254 | if (nilfs_btree_path_cache) |
Li Hong | 41c88bd | 2010-04-06 00:54:11 +0800 | [diff] [blame] | 1255 | kmem_cache_destroy(nilfs_btree_path_cache); |
| 1256 | } |
| 1257 | |
| 1258 | static int __init nilfs_init_cachep(void) |
| 1259 | { |
| 1260 | nilfs_inode_cachep = kmem_cache_create("nilfs2_inode_cache", |
| 1261 | sizeof(struct nilfs_inode_info), 0, |
| 1262 | SLAB_RECLAIM_ACCOUNT, nilfs_inode_init_once); |
| 1263 | if (!nilfs_inode_cachep) |
| 1264 | goto fail; |
| 1265 | |
| 1266 | nilfs_transaction_cachep = kmem_cache_create("nilfs2_transaction_cache", |
| 1267 | sizeof(struct nilfs_transaction_info), 0, |
| 1268 | SLAB_RECLAIM_ACCOUNT, NULL); |
| 1269 | if (!nilfs_transaction_cachep) |
| 1270 | goto fail; |
| 1271 | |
| 1272 | nilfs_segbuf_cachep = kmem_cache_create("nilfs2_segbuf_cache", |
| 1273 | sizeof(struct nilfs_segment_buffer), 0, |
| 1274 | SLAB_RECLAIM_ACCOUNT, nilfs_segbuf_init_once); |
| 1275 | if (!nilfs_segbuf_cachep) |
| 1276 | goto fail; |
| 1277 | |
| 1278 | nilfs_btree_path_cache = kmem_cache_create("nilfs2_btree_path_cache", |
| 1279 | sizeof(struct nilfs_btree_path) * NILFS_BTREE_LEVEL_MAX, |
| 1280 | 0, 0, NULL); |
| 1281 | if (!nilfs_btree_path_cache) |
| 1282 | goto fail; |
| 1283 | |
| 1284 | return 0; |
| 1285 | |
| 1286 | fail: |
| 1287 | nilfs_destroy_cachep(); |
| 1288 | return -ENOMEM; |
| 1289 | } |
| 1290 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1291 | static int __init init_nilfs_fs(void) |
| 1292 | { |
| 1293 | int err; |
| 1294 | |
Li Hong | 41c88bd | 2010-04-06 00:54:11 +0800 | [diff] [blame] | 1295 | err = nilfs_init_cachep(); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1296 | if (err) |
Li Hong | 41c88bd | 2010-04-06 00:54:11 +0800 | [diff] [blame] | 1297 | goto fail; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1298 | |
| 1299 | err = register_filesystem(&nilfs_fs_type); |
| 1300 | if (err) |
Li Hong | 41c88bd | 2010-04-06 00:54:11 +0800 | [diff] [blame] | 1301 | goto free_cachep; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1302 | |
Li Hong | 9f13026 | 2010-04-09 23:09:53 +0800 | [diff] [blame] | 1303 | printk(KERN_INFO "NILFS version 2 loaded\n"); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1304 | return 0; |
| 1305 | |
Li Hong | 41c88bd | 2010-04-06 00:54:11 +0800 | [diff] [blame] | 1306 | free_cachep: |
| 1307 | nilfs_destroy_cachep(); |
| 1308 | fail: |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1309 | return err; |
| 1310 | } |
| 1311 | |
| 1312 | static void __exit exit_nilfs_fs(void) |
| 1313 | { |
Li Hong | 41c88bd | 2010-04-06 00:54:11 +0800 | [diff] [blame] | 1314 | nilfs_destroy_cachep(); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1315 | unregister_filesystem(&nilfs_fs_type); |
| 1316 | } |
| 1317 | |
| 1318 | module_init(init_nilfs_fs) |
| 1319 | module_exit(exit_nilfs_fs) |