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> |
Jiro SEKIBA | b58a285 | 2009-06-24 20:06:34 +0900 | [diff] [blame] | 50 | #include <linux/seq_file.h> |
| 51 | #include <linux/mount.h> |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 52 | #include "nilfs.h" |
Ryusuke Konishi | 8e656fd | 2010-08-27 00:23:02 +0900 | [diff] [blame] | 53 | #include "export.h" |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 54 | #include "mdt.h" |
| 55 | #include "alloc.h" |
Ryusuke Konishi | 05d0e94 | 2010-07-10 20:52:09 +0900 | [diff] [blame] | 56 | #include "btree.h" |
| 57 | #include "btnode.h" |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 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 | |
Jiro SEKIBA | abc0b50 | 2010-10-08 22:37:27 +0900 | [diff] [blame] | 70 | static struct kmem_cache *nilfs_inode_cachep; |
Li Hong | 41c88bd | 2010-04-06 00:54:11 +0800 | [diff] [blame] | 71 | struct kmem_cache *nilfs_transaction_cachep; |
| 72 | struct kmem_cache *nilfs_segbuf_cachep; |
| 73 | struct kmem_cache *nilfs_btree_path_cache; |
| 74 | |
Ryusuke Konishi | 5beb6e0 | 2010-09-20 18:19:06 +0900 | [diff] [blame] | 75 | static int nilfs_setup_super(struct nilfs_sb_info *sbi, int is_mount); |
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); |
Joe Perches | b004a5e | 2010-11-09 16:35:21 -0800 | [diff] [blame] | 113 | struct va_format vaf; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 114 | va_list args; |
| 115 | |
| 116 | va_start(args, fmt); |
Joe Perches | b004a5e | 2010-11-09 16:35:21 -0800 | [diff] [blame] | 117 | |
| 118 | vaf.fmt = fmt; |
| 119 | vaf.va = &args; |
| 120 | |
| 121 | printk(KERN_CRIT "NILFS error (device %s): %s: %pV\n", |
| 122 | sb->s_id, function, &vaf); |
| 123 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 124 | va_end(args); |
| 125 | |
| 126 | if (!(sb->s_flags & MS_RDONLY)) { |
Ryusuke Konishi | c8a11c8 | 2010-06-28 17:49:30 +0900 | [diff] [blame] | 127 | nilfs_set_error(sbi); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 128 | |
| 129 | if (nilfs_test_opt(sbi, ERRORS_RO)) { |
| 130 | printk(KERN_CRIT "Remounting filesystem read-only\n"); |
| 131 | sb->s_flags |= MS_RDONLY; |
| 132 | } |
| 133 | } |
| 134 | |
| 135 | if (nilfs_test_opt(sbi, ERRORS_PANIC)) |
| 136 | panic("NILFS (device %s): panic forced after error\n", |
| 137 | sb->s_id); |
| 138 | } |
| 139 | |
| 140 | void nilfs_warning(struct super_block *sb, const char *function, |
| 141 | const char *fmt, ...) |
| 142 | { |
Joe Perches | b004a5e | 2010-11-09 16:35:21 -0800 | [diff] [blame] | 143 | struct va_format vaf; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 144 | va_list args; |
| 145 | |
| 146 | va_start(args, fmt); |
Joe Perches | b004a5e | 2010-11-09 16:35:21 -0800 | [diff] [blame] | 147 | |
| 148 | vaf.fmt = fmt; |
| 149 | vaf.va = &args; |
| 150 | |
| 151 | printk(KERN_WARNING "NILFS warning (device %s): %s: %pV\n", |
| 152 | sb->s_id, function, &vaf); |
| 153 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 154 | va_end(args); |
| 155 | } |
| 156 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 157 | |
Ryusuke Konishi | 2879ed6 | 2010-09-05 13:35:53 +0900 | [diff] [blame] | 158 | struct inode *nilfs_alloc_inode(struct super_block *sb) |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 159 | { |
| 160 | struct nilfs_inode_info *ii; |
| 161 | |
| 162 | ii = kmem_cache_alloc(nilfs_inode_cachep, GFP_NOFS); |
| 163 | if (!ii) |
| 164 | return NULL; |
| 165 | ii->i_bh = NULL; |
| 166 | ii->i_state = 0; |
Ryusuke Konishi | 0e14a35 | 2010-08-20 21:20:29 +0900 | [diff] [blame] | 167 | ii->i_cno = 0; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 168 | ii->vfs_inode.i_version = 1; |
Ryusuke Konishi | 2879ed6 | 2010-09-05 13:35:53 +0900 | [diff] [blame] | 169 | nilfs_btnode_cache_init(&ii->i_btnode_cache, sb->s_bdi); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 170 | return &ii->vfs_inode; |
| 171 | } |
| 172 | |
Nick Piggin | fa0d7e3 | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 173 | static void nilfs_i_callback(struct rcu_head *head) |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 174 | { |
Nick Piggin | fa0d7e3 | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 175 | struct inode *inode = container_of(head, struct inode, i_rcu); |
Ryusuke Konishi | b91c9a9 | 2010-08-20 23:46:06 +0900 | [diff] [blame] | 176 | struct nilfs_mdt_info *mdi = NILFS_MDT(inode); |
| 177 | |
Nick Piggin | fa0d7e3 | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 178 | INIT_LIST_HEAD(&inode->i_dentry); |
| 179 | |
Ryusuke Konishi | b91c9a9 | 2010-08-20 23:46:06 +0900 | [diff] [blame] | 180 | if (mdi) { |
| 181 | kfree(mdi->mi_bgl); /* kfree(NULL) is safe */ |
| 182 | kfree(mdi); |
| 183 | } |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 184 | kmem_cache_free(nilfs_inode_cachep, NILFS_I(inode)); |
| 185 | } |
| 186 | |
Nick Piggin | fa0d7e3 | 2011-01-07 17:49:49 +1100 | [diff] [blame] | 187 | void nilfs_destroy_inode(struct inode *inode) |
| 188 | { |
| 189 | call_rcu(&inode->i_rcu, nilfs_i_callback); |
| 190 | } |
| 191 | |
Jiro SEKIBA | b2ac86e | 2010-06-28 17:49:33 +0900 | [diff] [blame] | 192 | static int nilfs_sync_super(struct nilfs_sb_info *sbi, int flag) |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 193 | { |
| 194 | struct the_nilfs *nilfs = sbi->s_nilfs; |
| 195 | int err; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 196 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 197 | retry: |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 198 | set_buffer_dirty(nilfs->ns_sbh[0]); |
Christoph Hellwig | 87e9951 | 2010-08-11 17:05:45 +0200 | [diff] [blame] | 199 | if (nilfs_test_opt(sbi, BARRIER)) { |
| 200 | err = __sync_dirty_buffer(nilfs->ns_sbh[0], |
Christoph Hellwig | f8c131f | 2010-08-18 05:29:15 -0400 | [diff] [blame] | 201 | WRITE_SYNC | WRITE_FLUSH_FUA); |
Christoph Hellwig | 87e9951 | 2010-08-11 17:05:45 +0200 | [diff] [blame] | 202 | } else { |
| 203 | err = sync_dirty_buffer(nilfs->ns_sbh[0]); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 204 | } |
Christoph Hellwig | 87e9951 | 2010-08-11 17:05:45 +0200 | [diff] [blame] | 205 | |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 206 | if (unlikely(err)) { |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 207 | printk(KERN_ERR |
| 208 | "NILFS: unable to write superblock (err=%d)\n", err); |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 209 | if (err == -EIO && nilfs->ns_sbh[1]) { |
Jiro SEKIBA | b2ac86e | 2010-06-28 17:49:33 +0900 | [diff] [blame] | 210 | /* |
| 211 | * sbp[0] points to newer log than sbp[1], |
| 212 | * so copy sbp[0] to sbp[1] to take over sbp[0]. |
| 213 | */ |
| 214 | memcpy(nilfs->ns_sbp[1], nilfs->ns_sbp[0], |
| 215 | nilfs->ns_sbsize); |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 216 | nilfs_fall_back_super_block(nilfs); |
| 217 | goto retry; |
| 218 | } |
| 219 | } else { |
| 220 | struct nilfs_super_block *sbp = nilfs->ns_sbp[0]; |
| 221 | |
Jiro SEKIBA | b2ac86e | 2010-06-28 17:49:33 +0900 | [diff] [blame] | 222 | nilfs->ns_sbwcount++; |
| 223 | |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 224 | /* |
| 225 | * The latest segment becomes trailable from the position |
| 226 | * written in superblock. |
| 227 | */ |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 228 | clear_nilfs_discontinued(nilfs); |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 229 | |
| 230 | /* update GC protection for recent segments */ |
| 231 | if (nilfs->ns_sbh[1]) { |
Jiro SEKIBA | b2ac86e | 2010-06-28 17:49:33 +0900 | [diff] [blame] | 232 | if (flag == NILFS_SB_COMMIT_ALL) { |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 233 | set_buffer_dirty(nilfs->ns_sbh[1]); |
Jiro SEKIBA | b2ac86e | 2010-06-28 17:49:33 +0900 | [diff] [blame] | 234 | if (sync_dirty_buffer(nilfs->ns_sbh[1]) < 0) |
| 235 | goto out; |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 236 | } |
Jiro SEKIBA | b2ac86e | 2010-06-28 17:49:33 +0900 | [diff] [blame] | 237 | if (le64_to_cpu(nilfs->ns_sbp[1]->s_last_cno) < |
| 238 | le64_to_cpu(nilfs->ns_sbp[0]->s_last_cno)) |
| 239 | sbp = nilfs->ns_sbp[1]; |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 240 | } |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 241 | |
Jiro SEKIBA | b2ac86e | 2010-06-28 17:49:33 +0900 | [diff] [blame] | 242 | spin_lock(&nilfs->ns_last_segment_lock); |
| 243 | nilfs->ns_prot_seq = le64_to_cpu(sbp->s_last_seq); |
| 244 | spin_unlock(&nilfs->ns_last_segment_lock); |
| 245 | } |
| 246 | out: |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 247 | return err; |
| 248 | } |
| 249 | |
Ryusuke Konishi | 60f46b7 | 2010-06-28 17:49:31 +0900 | [diff] [blame] | 250 | void nilfs_set_log_cursor(struct nilfs_super_block *sbp, |
| 251 | struct the_nilfs *nilfs) |
| 252 | { |
| 253 | sector_t nfreeblocks; |
| 254 | |
| 255 | /* nilfs->ns_sem must be locked by the caller. */ |
| 256 | nilfs_count_free_blocks(nilfs, &nfreeblocks); |
| 257 | sbp->s_free_blocks_count = cpu_to_le64(nfreeblocks); |
| 258 | |
| 259 | spin_lock(&nilfs->ns_last_segment_lock); |
| 260 | sbp->s_last_seq = cpu_to_le64(nilfs->ns_last_seq); |
| 261 | sbp->s_last_pseg = cpu_to_le64(nilfs->ns_last_pseg); |
| 262 | sbp->s_last_cno = cpu_to_le64(nilfs->ns_last_cno); |
| 263 | spin_unlock(&nilfs->ns_last_segment_lock); |
| 264 | } |
| 265 | |
Jiro SEKIBA | b2ac86e | 2010-06-28 17:49:33 +0900 | [diff] [blame] | 266 | struct nilfs_super_block **nilfs_prepare_super(struct nilfs_sb_info *sbi, |
| 267 | int flip) |
Jiro SEKIBA | d26493b | 2010-06-28 17:49:32 +0900 | [diff] [blame] | 268 | { |
| 269 | struct the_nilfs *nilfs = sbi->s_nilfs; |
| 270 | struct nilfs_super_block **sbp = nilfs->ns_sbp; |
| 271 | |
| 272 | /* nilfs->ns_sem must be locked by the caller. */ |
| 273 | if (sbp[0]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) { |
| 274 | if (sbp[1] && |
| 275 | sbp[1]->s_magic == cpu_to_le16(NILFS_SUPER_MAGIC)) { |
Jiro SEKIBA | b2ac86e | 2010-06-28 17:49:33 +0900 | [diff] [blame] | 276 | memcpy(sbp[0], sbp[1], nilfs->ns_sbsize); |
Jiro SEKIBA | d26493b | 2010-06-28 17:49:32 +0900 | [diff] [blame] | 277 | } else { |
| 278 | printk(KERN_CRIT "NILFS: superblock broke on dev %s\n", |
| 279 | sbi->s_super->s_id); |
| 280 | return NULL; |
| 281 | } |
Jiro SEKIBA | b2ac86e | 2010-06-28 17:49:33 +0900 | [diff] [blame] | 282 | } else if (sbp[1] && |
| 283 | sbp[1]->s_magic != cpu_to_le16(NILFS_SUPER_MAGIC)) { |
| 284 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); |
Jiro SEKIBA | d26493b | 2010-06-28 17:49:32 +0900 | [diff] [blame] | 285 | } |
Jiro SEKIBA | b2ac86e | 2010-06-28 17:49:33 +0900 | [diff] [blame] | 286 | |
| 287 | if (flip && sbp[1]) |
| 288 | nilfs_swap_super_block(nilfs); |
| 289 | |
Jiro SEKIBA | d26493b | 2010-06-28 17:49:32 +0900 | [diff] [blame] | 290 | return sbp; |
| 291 | } |
| 292 | |
Jiro SEKIBA | b2ac86e | 2010-06-28 17:49:33 +0900 | [diff] [blame] | 293 | int nilfs_commit_super(struct nilfs_sb_info *sbi, int flag) |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 294 | { |
| 295 | struct the_nilfs *nilfs = sbi->s_nilfs; |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 296 | struct nilfs_super_block **sbp = nilfs->ns_sbp; |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 297 | time_t t; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 298 | |
Jiro SEKIBA | d26493b | 2010-06-28 17:49:32 +0900 | [diff] [blame] | 299 | /* nilfs->ns_sem must be locked by the caller. */ |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 300 | t = get_seconds(); |
Jiro SEKIBA | b2ac86e | 2010-06-28 17:49:33 +0900 | [diff] [blame] | 301 | nilfs->ns_sbwtime = t; |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 302 | sbp[0]->s_wtime = cpu_to_le64(t); |
| 303 | sbp[0]->s_sum = 0; |
| 304 | sbp[0]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed, |
| 305 | (unsigned char *)sbp[0], |
| 306 | nilfs->ns_sbsize)); |
Jiro SEKIBA | b2ac86e | 2010-06-28 17:49:33 +0900 | [diff] [blame] | 307 | if (flag == NILFS_SB_COMMIT_ALL && sbp[1]) { |
| 308 | sbp[1]->s_wtime = sbp[0]->s_wtime; |
| 309 | sbp[1]->s_sum = 0; |
| 310 | sbp[1]->s_sum = cpu_to_le32(crc32_le(nilfs->ns_crc_seed, |
| 311 | (unsigned char *)sbp[1], |
| 312 | nilfs->ns_sbsize)); |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 313 | } |
Ryusuke Konishi | e605f0a | 2009-12-09 00:57:52 +0900 | [diff] [blame] | 314 | clear_nilfs_sb_dirty(nilfs); |
Jiro SEKIBA | b2ac86e | 2010-06-28 17:49:33 +0900 | [diff] [blame] | 315 | return nilfs_sync_super(sbi, flag); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 316 | } |
| 317 | |
Ryusuke Konishi | 7ecaa46 | 2010-06-28 17:49:29 +0900 | [diff] [blame] | 318 | /** |
| 319 | * nilfs_cleanup_super() - write filesystem state for cleanup |
| 320 | * @sbi: nilfs_sb_info to be unmounted or degraded to read-only |
| 321 | * |
| 322 | * This function restores state flags in the on-disk super block. |
| 323 | * This will set "clean" flag (i.e. NILFS_VALID_FS) unless the |
| 324 | * filesystem was not clean previously. |
| 325 | */ |
| 326 | int nilfs_cleanup_super(struct nilfs_sb_info *sbi) |
| 327 | { |
Jiro SEKIBA | d26493b | 2010-06-28 17:49:32 +0900 | [diff] [blame] | 328 | struct nilfs_super_block **sbp; |
Jiro SEKIBA | b2ac86e | 2010-06-28 17:49:33 +0900 | [diff] [blame] | 329 | int flag = NILFS_SB_COMMIT; |
Jiro SEKIBA | d26493b | 2010-06-28 17:49:32 +0900 | [diff] [blame] | 330 | int ret = -EIO; |
Ryusuke Konishi | 7ecaa46 | 2010-06-28 17:49:29 +0900 | [diff] [blame] | 331 | |
Jiro SEKIBA | b2ac86e | 2010-06-28 17:49:33 +0900 | [diff] [blame] | 332 | sbp = nilfs_prepare_super(sbi, 0); |
Jiro SEKIBA | d26493b | 2010-06-28 17:49:32 +0900 | [diff] [blame] | 333 | if (sbp) { |
| 334 | 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] | 335 | nilfs_set_log_cursor(sbp[0], sbi->s_nilfs); |
| 336 | if (sbp[1] && sbp[0]->s_last_cno == sbp[1]->s_last_cno) { |
| 337 | /* |
| 338 | * make the "clean" flag also to the opposite |
| 339 | * super block if both super blocks point to |
| 340 | * the same checkpoint. |
| 341 | */ |
| 342 | sbp[1]->s_state = sbp[0]->s_state; |
| 343 | flag = NILFS_SB_COMMIT_ALL; |
| 344 | } |
| 345 | ret = nilfs_commit_super(sbi, flag); |
Jiro SEKIBA | d26493b | 2010-06-28 17:49:32 +0900 | [diff] [blame] | 346 | } |
Ryusuke Konishi | 7ecaa46 | 2010-06-28 17:49:29 +0900 | [diff] [blame] | 347 | return ret; |
| 348 | } |
| 349 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 350 | static void nilfs_put_super(struct super_block *sb) |
| 351 | { |
| 352 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
| 353 | struct the_nilfs *nilfs = sbi->s_nilfs; |
| 354 | |
| 355 | nilfs_detach_segment_constructor(sbi); |
| 356 | |
| 357 | if (!(sb->s_flags & MS_RDONLY)) { |
| 358 | down_write(&nilfs->ns_sem); |
Ryusuke Konishi | 7ecaa46 | 2010-06-28 17:49:29 +0900 | [diff] [blame] | 359 | nilfs_cleanup_super(sbi); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 360 | up_write(&nilfs->ns_sem); |
| 361 | } |
| 362 | |
Ryusuke Konishi | f1e89c8 | 2010-09-05 12:20:59 +0900 | [diff] [blame] | 363 | iput(nilfs->ns_sufile); |
| 364 | iput(nilfs->ns_cpfile); |
| 365 | iput(nilfs->ns_dat); |
| 366 | |
Ryusuke Konishi | 348fe8d | 2010-09-09 02:07:56 +0900 | [diff] [blame] | 367 | destroy_nilfs(nilfs); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 368 | sbi->s_super = NULL; |
| 369 | sb->s_fs_info = NULL; |
Ryusuke Konishi | f11459a | 2010-08-16 01:54:52 +0900 | [diff] [blame] | 370 | kfree(sbi); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 371 | } |
| 372 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 373 | static int nilfs_sync_fs(struct super_block *sb, int wait) |
| 374 | { |
Jiro SEKIBA | 6233caa | 2009-07-23 01:26:33 +0900 | [diff] [blame] | 375 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
| 376 | struct the_nilfs *nilfs = sbi->s_nilfs; |
Jiro SEKIBA | d26493b | 2010-06-28 17:49:32 +0900 | [diff] [blame] | 377 | struct nilfs_super_block **sbp; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 378 | int err = 0; |
| 379 | |
| 380 | /* This function is called when super block should be written back */ |
| 381 | if (wait) |
| 382 | err = nilfs_construct_segment(sb); |
Jiro SEKIBA | 6233caa | 2009-07-23 01:26:33 +0900 | [diff] [blame] | 383 | |
| 384 | down_write(&nilfs->ns_sem); |
Jiro SEKIBA | d26493b | 2010-06-28 17:49:32 +0900 | [diff] [blame] | 385 | if (nilfs_sb_dirty(nilfs)) { |
Jiro SEKIBA | b2ac86e | 2010-06-28 17:49:33 +0900 | [diff] [blame] | 386 | sbp = nilfs_prepare_super(sbi, nilfs_sb_will_flip(nilfs)); |
| 387 | if (likely(sbp)) { |
| 388 | nilfs_set_log_cursor(sbp[0], nilfs); |
| 389 | nilfs_commit_super(sbi, NILFS_SB_COMMIT); |
| 390 | } |
Jiro SEKIBA | d26493b | 2010-06-28 17:49:32 +0900 | [diff] [blame] | 391 | } |
Jiro SEKIBA | 6233caa | 2009-07-23 01:26:33 +0900 | [diff] [blame] | 392 | up_write(&nilfs->ns_sem); |
| 393 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 394 | return err; |
| 395 | } |
| 396 | |
Ryusuke Konishi | 4d8d929 | 2010-08-25 17:45:44 +0900 | [diff] [blame] | 397 | int nilfs_attach_checkpoint(struct nilfs_sb_info *sbi, __u64 cno, int curr_mnt, |
| 398 | struct nilfs_root **rootp) |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 399 | { |
| 400 | struct the_nilfs *nilfs = sbi->s_nilfs; |
Ryusuke Konishi | 4d8d929 | 2010-08-25 17:45:44 +0900 | [diff] [blame] | 401 | struct nilfs_root *root; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 402 | struct nilfs_checkpoint *raw_cp; |
| 403 | struct buffer_head *bh_cp; |
Ryusuke Konishi | 4d8d929 | 2010-08-25 17:45:44 +0900 | [diff] [blame] | 404 | int err = -ENOMEM; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 405 | |
Ryusuke Konishi | 4d8d929 | 2010-08-25 17:45:44 +0900 | [diff] [blame] | 406 | root = nilfs_find_or_create_root( |
| 407 | nilfs, curr_mnt ? NILFS_CPTREE_CURRENT_CNO : cno); |
| 408 | if (!root) |
| 409 | return err; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 410 | |
Ryusuke Konishi | e912a5b | 2010-08-14 13:07:15 +0900 | [diff] [blame] | 411 | if (root->ifile) |
| 412 | goto reuse; /* already attached checkpoint */ |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 413 | |
Zhang Qiang | 1154ecb | 2009-08-18 14:58:24 +0800 | [diff] [blame] | 414 | down_read(&nilfs->ns_segctor_sem); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 415 | err = nilfs_cpfile_get_checkpoint(nilfs->ns_cpfile, cno, 0, &raw_cp, |
| 416 | &bh_cp); |
Zhang Qiang | 1154ecb | 2009-08-18 14:58:24 +0800 | [diff] [blame] | 417 | up_read(&nilfs->ns_segctor_sem); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 418 | if (unlikely(err)) { |
| 419 | if (err == -ENOENT || err == -EINVAL) { |
| 420 | printk(KERN_ERR |
| 421 | "NILFS: Invalid checkpoint " |
| 422 | "(checkpoint number=%llu)\n", |
| 423 | (unsigned long long)cno); |
| 424 | err = -EINVAL; |
| 425 | } |
| 426 | goto failed; |
| 427 | } |
Ryusuke Konishi | f1e89c8 | 2010-09-05 12:20:59 +0900 | [diff] [blame] | 428 | |
| 429 | err = nilfs_ifile_read(sbi->s_super, root, nilfs->ns_inode_size, |
| 430 | &raw_cp->cp_ifile_inode, &root->ifile); |
| 431 | if (err) |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 432 | goto failed_bh; |
Ryusuke Konishi | b7c0634 | 2010-08-14 14:48:32 +0900 | [diff] [blame] | 433 | |
| 434 | atomic_set(&root->inodes_count, le64_to_cpu(raw_cp->cp_inodes_count)); |
| 435 | atomic_set(&root->blocks_count, le64_to_cpu(raw_cp->cp_blocks_count)); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 436 | |
| 437 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); |
Ryusuke Konishi | 4d8d929 | 2010-08-25 17:45:44 +0900 | [diff] [blame] | 438 | |
Ryusuke Konishi | e912a5b | 2010-08-14 13:07:15 +0900 | [diff] [blame] | 439 | reuse: |
Ryusuke Konishi | 4d8d929 | 2010-08-25 17:45:44 +0900 | [diff] [blame] | 440 | *rootp = root; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 441 | return 0; |
| 442 | |
| 443 | failed_bh: |
| 444 | nilfs_cpfile_put_checkpoint(nilfs->ns_cpfile, cno, bh_cp); |
| 445 | failed: |
Ryusuke Konishi | 4d8d929 | 2010-08-25 17:45:44 +0900 | [diff] [blame] | 446 | nilfs_put_root(root); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 447 | |
| 448 | return err; |
| 449 | } |
| 450 | |
Ryusuke Konishi | 5beb6e0 | 2010-09-20 18:19:06 +0900 | [diff] [blame] | 451 | static int nilfs_freeze(struct super_block *sb) |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 452 | { |
Ryusuke Konishi | 5beb6e0 | 2010-09-20 18:19:06 +0900 | [diff] [blame] | 453 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
| 454 | struct the_nilfs *nilfs = sbi->s_nilfs; |
| 455 | int err; |
| 456 | |
| 457 | if (sb->s_flags & MS_RDONLY) |
| 458 | return 0; |
| 459 | |
| 460 | /* Mark super block clean */ |
| 461 | down_write(&nilfs->ns_sem); |
| 462 | err = nilfs_cleanup_super(sbi); |
| 463 | up_write(&nilfs->ns_sem); |
| 464 | return err; |
| 465 | } |
| 466 | |
| 467 | static int nilfs_unfreeze(struct super_block *sb) |
| 468 | { |
| 469 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 470 | struct the_nilfs *nilfs = sbi->s_nilfs; |
| 471 | |
Ryusuke Konishi | 5beb6e0 | 2010-09-20 18:19:06 +0900 | [diff] [blame] | 472 | if (sb->s_flags & MS_RDONLY) |
| 473 | return 0; |
| 474 | |
| 475 | down_write(&nilfs->ns_sem); |
| 476 | nilfs_setup_super(sbi, false); |
| 477 | up_write(&nilfs->ns_sem); |
| 478 | return 0; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 479 | } |
| 480 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 481 | static int nilfs_statfs(struct dentry *dentry, struct kstatfs *buf) |
| 482 | { |
| 483 | struct super_block *sb = dentry->d_sb; |
Ryusuke Konishi | b7c0634 | 2010-08-14 14:48:32 +0900 | [diff] [blame] | 484 | struct nilfs_root *root = NILFS_I(dentry->d_inode)->i_root; |
| 485 | struct the_nilfs *nilfs = root->nilfs; |
Ryusuke Konishi | c306af2 | 2009-03-26 10:16:57 +0900 | [diff] [blame] | 486 | u64 id = huge_encode_dev(sb->s_bdev->bd_dev); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 487 | unsigned long long blocks; |
| 488 | unsigned long overhead; |
| 489 | unsigned long nrsvblocks; |
| 490 | sector_t nfreeblocks; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 491 | int err; |
| 492 | |
| 493 | /* |
| 494 | * Compute all of the segment blocks |
| 495 | * |
| 496 | * The blocks before first segment and after last segment |
| 497 | * are excluded. |
| 498 | */ |
| 499 | blocks = nilfs->ns_blocks_per_segment * nilfs->ns_nsegments |
| 500 | - nilfs->ns_first_data_block; |
| 501 | nrsvblocks = nilfs->ns_nrsvsegs * nilfs->ns_blocks_per_segment; |
| 502 | |
| 503 | /* |
| 504 | * Compute the overhead |
| 505 | * |
Ryusuke Konishi | 7a65004 | 2010-03-14 03:32:40 +0900 | [diff] [blame] | 506 | * When distributing meta data blocks outside segment structure, |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 507 | * We must count them as the overhead. |
| 508 | */ |
| 509 | overhead = 0; |
| 510 | |
| 511 | err = nilfs_count_free_blocks(nilfs, &nfreeblocks); |
| 512 | if (unlikely(err)) |
| 513 | return err; |
| 514 | |
| 515 | buf->f_type = NILFS_SUPER_MAGIC; |
| 516 | buf->f_bsize = sb->s_blocksize; |
| 517 | buf->f_blocks = blocks - overhead; |
| 518 | buf->f_bfree = nfreeblocks; |
| 519 | buf->f_bavail = (buf->f_bfree >= nrsvblocks) ? |
| 520 | (buf->f_bfree - nrsvblocks) : 0; |
Ryusuke Konishi | b7c0634 | 2010-08-14 14:48:32 +0900 | [diff] [blame] | 521 | buf->f_files = atomic_read(&root->inodes_count); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 522 | buf->f_ffree = 0; /* nilfs_count_free_inodes(sb); */ |
| 523 | buf->f_namelen = NILFS_NAME_LEN; |
Ryusuke Konishi | c306af2 | 2009-03-26 10:16:57 +0900 | [diff] [blame] | 524 | buf->f_fsid.val[0] = (u32)id; |
| 525 | buf->f_fsid.val[1] = (u32)(id >> 32); |
| 526 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 527 | return 0; |
| 528 | } |
| 529 | |
Jiro SEKIBA | b58a285 | 2009-06-24 20:06:34 +0900 | [diff] [blame] | 530 | static int nilfs_show_options(struct seq_file *seq, struct vfsmount *vfs) |
| 531 | { |
| 532 | struct super_block *sb = vfs->mnt_sb; |
| 533 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
Ryusuke Konishi | f11459a | 2010-08-16 01:54:52 +0900 | [diff] [blame] | 534 | struct nilfs_root *root = NILFS_I(vfs->mnt_root->d_inode)->i_root; |
Jiro SEKIBA | b58a285 | 2009-06-24 20:06:34 +0900 | [diff] [blame] | 535 | |
| 536 | if (!nilfs_test_opt(sbi, BARRIER)) |
Ryusuke Konishi | c6b4d57 | 2010-07-05 14:40:27 +0900 | [diff] [blame] | 537 | seq_puts(seq, ",nobarrier"); |
Ryusuke Konishi | f11459a | 2010-08-16 01:54:52 +0900 | [diff] [blame] | 538 | if (root->cno != NILFS_CPTREE_CURRENT_CNO) |
| 539 | seq_printf(seq, ",cp=%llu", (unsigned long long)root->cno); |
Jiro SEKIBA | b58a285 | 2009-06-24 20:06:34 +0900 | [diff] [blame] | 540 | if (nilfs_test_opt(sbi, ERRORS_PANIC)) |
Ryusuke Konishi | c6b4d57 | 2010-07-05 14:40:27 +0900 | [diff] [blame] | 541 | seq_puts(seq, ",errors=panic"); |
Ryusuke Konishi | 277a6a3 | 2010-04-02 18:02:33 +0900 | [diff] [blame] | 542 | if (nilfs_test_opt(sbi, ERRORS_CONT)) |
Ryusuke Konishi | c6b4d57 | 2010-07-05 14:40:27 +0900 | [diff] [blame] | 543 | seq_puts(seq, ",errors=continue"); |
Jiro SEKIBA | b58a285 | 2009-06-24 20:06:34 +0900 | [diff] [blame] | 544 | if (nilfs_test_opt(sbi, STRICT_ORDER)) |
Ryusuke Konishi | c6b4d57 | 2010-07-05 14:40:27 +0900 | [diff] [blame] | 545 | seq_puts(seq, ",order=strict"); |
Ryusuke Konishi | 0234576 | 2009-11-20 03:28:01 +0900 | [diff] [blame] | 546 | if (nilfs_test_opt(sbi, NORECOVERY)) |
Ryusuke Konishi | c6b4d57 | 2010-07-05 14:40:27 +0900 | [diff] [blame] | 547 | seq_puts(seq, ",norecovery"); |
Jiro SEKIBA | e902ec9 | 2010-01-30 18:06:35 +0900 | [diff] [blame] | 548 | if (nilfs_test_opt(sbi, DISCARD)) |
Ryusuke Konishi | c6b4d57 | 2010-07-05 14:40:27 +0900 | [diff] [blame] | 549 | seq_puts(seq, ",discard"); |
Jiro SEKIBA | b58a285 | 2009-06-24 20:06:34 +0900 | [diff] [blame] | 550 | |
| 551 | return 0; |
| 552 | } |
| 553 | |
Alexey Dobriyan | b87221d | 2009-09-21 17:01:09 -0700 | [diff] [blame] | 554 | static const struct super_operations nilfs_sops = { |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 555 | .alloc_inode = nilfs_alloc_inode, |
| 556 | .destroy_inode = nilfs_destroy_inode, |
| 557 | .dirty_inode = nilfs_dirty_inode, |
| 558 | /* .write_inode = nilfs_write_inode, */ |
| 559 | /* .put_inode = nilfs_put_inode, */ |
| 560 | /* .drop_inode = nilfs_drop_inode, */ |
Al Viro | 6fd1e5c | 2010-06-07 11:55:00 -0400 | [diff] [blame] | 561 | .evict_inode = nilfs_evict_inode, |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 562 | .put_super = nilfs_put_super, |
Jiro SEKIBA | 1dfa271 | 2009-07-23 01:33:49 +0900 | [diff] [blame] | 563 | /* .write_super = nilfs_write_super, */ |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 564 | .sync_fs = nilfs_sync_fs, |
Ryusuke Konishi | 5beb6e0 | 2010-09-20 18:19:06 +0900 | [diff] [blame] | 565 | .freeze_fs = nilfs_freeze, |
| 566 | .unfreeze_fs = nilfs_unfreeze, |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 567 | /* .write_super_lockfs */ |
| 568 | /* .unlockfs */ |
| 569 | .statfs = nilfs_statfs, |
| 570 | .remount_fs = nilfs_remount, |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 571 | /* .umount_begin */ |
Jiro SEKIBA | b58a285 | 2009-06-24 20:06:34 +0900 | [diff] [blame] | 572 | .show_options = nilfs_show_options |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 573 | }; |
| 574 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 575 | enum { |
| 576 | Opt_err_cont, Opt_err_panic, Opt_err_ro, |
Ryusuke Konishi | 773bc4f | 2010-07-05 13:00:08 +0900 | [diff] [blame] | 577 | Opt_barrier, Opt_nobarrier, Opt_snapshot, Opt_order, Opt_norecovery, |
Ryusuke Konishi | 802d317 | 2010-07-05 14:27:04 +0900 | [diff] [blame] | 578 | Opt_discard, Opt_nodiscard, Opt_err, |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 579 | }; |
| 580 | |
| 581 | static match_table_t tokens = { |
| 582 | {Opt_err_cont, "errors=continue"}, |
| 583 | {Opt_err_panic, "errors=panic"}, |
| 584 | {Opt_err_ro, "errors=remount-ro"}, |
Ryusuke Konishi | 773bc4f | 2010-07-05 13:00:08 +0900 | [diff] [blame] | 585 | {Opt_barrier, "barrier"}, |
Jiro SEKIBA | 91f1953 | 2009-11-12 14:07:26 +0900 | [diff] [blame] | 586 | {Opt_nobarrier, "nobarrier"}, |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 587 | {Opt_snapshot, "cp=%u"}, |
| 588 | {Opt_order, "order=%s"}, |
Ryusuke Konishi | 0234576 | 2009-11-20 03:28:01 +0900 | [diff] [blame] | 589 | {Opt_norecovery, "norecovery"}, |
Jiro SEKIBA | e902ec9 | 2010-01-30 18:06:35 +0900 | [diff] [blame] | 590 | {Opt_discard, "discard"}, |
Ryusuke Konishi | 802d317 | 2010-07-05 14:27:04 +0900 | [diff] [blame] | 591 | {Opt_nodiscard, "nodiscard"}, |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 592 | {Opt_err, NULL} |
| 593 | }; |
| 594 | |
Ryusuke Konishi | 7c01745 | 2010-07-05 20:08:33 +0900 | [diff] [blame] | 595 | 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] | 596 | { |
| 597 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
| 598 | char *p; |
| 599 | substring_t args[MAX_OPT_ARGS]; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 600 | |
| 601 | if (!options) |
| 602 | return 1; |
| 603 | |
| 604 | while ((p = strsep(&options, ",")) != NULL) { |
| 605 | int token; |
| 606 | if (!*p) |
| 607 | continue; |
| 608 | |
| 609 | token = match_token(p, tokens, args); |
| 610 | switch (token) { |
Ryusuke Konishi | 773bc4f | 2010-07-05 13:00:08 +0900 | [diff] [blame] | 611 | case Opt_barrier: |
| 612 | nilfs_set_opt(sbi, BARRIER); |
| 613 | break; |
Jiro SEKIBA | 91f1953 | 2009-11-12 14:07:26 +0900 | [diff] [blame] | 614 | case Opt_nobarrier: |
| 615 | nilfs_clear_opt(sbi, BARRIER); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 616 | break; |
| 617 | case Opt_order: |
| 618 | if (strcmp(args[0].from, "relaxed") == 0) |
| 619 | /* Ordered data semantics */ |
| 620 | nilfs_clear_opt(sbi, STRICT_ORDER); |
| 621 | else if (strcmp(args[0].from, "strict") == 0) |
| 622 | /* Strict in-order semantics */ |
| 623 | nilfs_set_opt(sbi, STRICT_ORDER); |
| 624 | else |
| 625 | return 0; |
| 626 | break; |
| 627 | case Opt_err_panic: |
| 628 | nilfs_write_opt(sbi, ERROR_MODE, ERRORS_PANIC); |
| 629 | break; |
| 630 | case Opt_err_ro: |
| 631 | nilfs_write_opt(sbi, ERROR_MODE, ERRORS_RO); |
| 632 | break; |
| 633 | case Opt_err_cont: |
| 634 | nilfs_write_opt(sbi, ERROR_MODE, ERRORS_CONT); |
| 635 | break; |
| 636 | case Opt_snapshot: |
Ryusuke Konishi | 7c01745 | 2010-07-05 20:08:33 +0900 | [diff] [blame] | 637 | if (is_remount) { |
Ryusuke Konishi | f11459a | 2010-08-16 01:54:52 +0900 | [diff] [blame] | 638 | printk(KERN_ERR |
| 639 | "NILFS: \"%s\" option is invalid " |
| 640 | "for remount.\n", p); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 641 | return 0; |
Ryusuke Konishi | 7c01745 | 2010-07-05 20:08:33 +0900 | [diff] [blame] | 642 | } |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 643 | break; |
Ryusuke Konishi | 0234576 | 2009-11-20 03:28:01 +0900 | [diff] [blame] | 644 | case Opt_norecovery: |
| 645 | nilfs_set_opt(sbi, NORECOVERY); |
| 646 | break; |
Jiro SEKIBA | e902ec9 | 2010-01-30 18:06:35 +0900 | [diff] [blame] | 647 | case Opt_discard: |
| 648 | nilfs_set_opt(sbi, DISCARD); |
| 649 | break; |
Ryusuke Konishi | 802d317 | 2010-07-05 14:27:04 +0900 | [diff] [blame] | 650 | case Opt_nodiscard: |
| 651 | nilfs_clear_opt(sbi, DISCARD); |
| 652 | break; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 653 | default: |
| 654 | printk(KERN_ERR |
| 655 | "NILFS: Unrecognized mount option \"%s\"\n", p); |
| 656 | return 0; |
| 657 | } |
| 658 | } |
| 659 | return 1; |
| 660 | } |
| 661 | |
| 662 | static inline void |
| 663 | nilfs_set_default_options(struct nilfs_sb_info *sbi, |
| 664 | struct nilfs_super_block *sbp) |
| 665 | { |
| 666 | sbi->s_mount_opt = |
Ryusuke Konishi | 277a6a3 | 2010-04-02 18:02:33 +0900 | [diff] [blame] | 667 | NILFS_MOUNT_ERRORS_RO | NILFS_MOUNT_BARRIER; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 668 | } |
| 669 | |
Ryusuke Konishi | 5beb6e0 | 2010-09-20 18:19:06 +0900 | [diff] [blame] | 670 | static int nilfs_setup_super(struct nilfs_sb_info *sbi, int is_mount) |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 671 | { |
| 672 | struct the_nilfs *nilfs = sbi->s_nilfs; |
Jiro SEKIBA | d26493b | 2010-06-28 17:49:32 +0900 | [diff] [blame] | 673 | struct nilfs_super_block **sbp; |
| 674 | int max_mnt_count; |
| 675 | int mnt_count; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 676 | |
Jiro SEKIBA | d26493b | 2010-06-28 17:49:32 +0900 | [diff] [blame] | 677 | /* nilfs->ns_sem must be locked by the caller. */ |
Jiro SEKIBA | b2ac86e | 2010-06-28 17:49:33 +0900 | [diff] [blame] | 678 | sbp = nilfs_prepare_super(sbi, 0); |
Jiro SEKIBA | d26493b | 2010-06-28 17:49:32 +0900 | [diff] [blame] | 679 | if (!sbp) |
| 680 | return -EIO; |
| 681 | |
Ryusuke Konishi | 5beb6e0 | 2010-09-20 18:19:06 +0900 | [diff] [blame] | 682 | if (!is_mount) |
| 683 | goto skip_mount_setup; |
| 684 | |
Jiro SEKIBA | d26493b | 2010-06-28 17:49:32 +0900 | [diff] [blame] | 685 | max_mnt_count = le16_to_cpu(sbp[0]->s_max_mnt_count); |
| 686 | mnt_count = le16_to_cpu(sbp[0]->s_mnt_count); |
| 687 | |
Ryusuke Konishi | f50a4c8 | 2009-11-19 16:58:40 +0900 | [diff] [blame] | 688 | if (nilfs->ns_mount_state & NILFS_ERROR_FS) { |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 689 | printk(KERN_WARNING |
| 690 | "NILFS warning: mounting fs with errors\n"); |
| 691 | #if 0 |
| 692 | } else if (max_mnt_count >= 0 && mnt_count >= max_mnt_count) { |
| 693 | printk(KERN_WARNING |
| 694 | "NILFS warning: maximal mount count reached\n"); |
| 695 | #endif |
| 696 | } |
| 697 | if (!max_mnt_count) |
Jiro SEKIBA | d26493b | 2010-06-28 17:49:32 +0900 | [diff] [blame] | 698 | 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] | 699 | |
Jiro SEKIBA | d26493b | 2010-06-28 17:49:32 +0900 | [diff] [blame] | 700 | sbp[0]->s_mnt_count = cpu_to_le16(mnt_count + 1); |
Ryusuke Konishi | 5beb6e0 | 2010-09-20 18:19:06 +0900 | [diff] [blame] | 701 | sbp[0]->s_mtime = cpu_to_le64(get_seconds()); |
| 702 | |
| 703 | skip_mount_setup: |
Jiro SEKIBA | d26493b | 2010-06-28 17:49:32 +0900 | [diff] [blame] | 704 | sbp[0]->s_state = |
| 705 | cpu_to_le16(le16_to_cpu(sbp[0]->s_state) & ~NILFS_VALID_FS); |
Jiro SEKIBA | b2ac86e | 2010-06-28 17:49:33 +0900 | [diff] [blame] | 706 | /* synchronize sbp[1] with sbp[0] */ |
| 707 | memcpy(sbp[1], sbp[0], nilfs->ns_sbsize); |
| 708 | return nilfs_commit_super(sbi, NILFS_SB_COMMIT_ALL); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 709 | } |
| 710 | |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 711 | struct nilfs_super_block *nilfs_read_super_block(struct super_block *sb, |
| 712 | u64 pos, int blocksize, |
| 713 | struct buffer_head **pbh) |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 714 | { |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 715 | unsigned long long sb_index = pos; |
| 716 | unsigned long offset; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 717 | |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 718 | offset = do_div(sb_index, blocksize); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 719 | *pbh = sb_bread(sb, sb_index); |
Ryusuke Konishi | e339ad3 | 2009-04-06 19:01:59 -0700 | [diff] [blame] | 720 | if (!*pbh) |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 721 | return NULL; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 722 | return (struct nilfs_super_block *)((char *)(*pbh)->b_data + offset); |
| 723 | } |
| 724 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 725 | int nilfs_store_magic_and_option(struct super_block *sb, |
| 726 | struct nilfs_super_block *sbp, |
| 727 | char *data) |
| 728 | { |
| 729 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
| 730 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 731 | sb->s_magic = le16_to_cpu(sbp->s_magic); |
| 732 | |
| 733 | /* FS independent flags */ |
| 734 | #ifdef NILFS_ATIME_DISABLE |
| 735 | sb->s_flags |= MS_NOATIME; |
| 736 | #endif |
| 737 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 738 | nilfs_set_default_options(sbi, sbp); |
| 739 | |
| 740 | sbi->s_resuid = le16_to_cpu(sbp->s_def_resuid); |
| 741 | sbi->s_resgid = le16_to_cpu(sbp->s_def_resgid); |
| 742 | sbi->s_interval = le32_to_cpu(sbp->s_c_interval); |
| 743 | sbi->s_watermark = le32_to_cpu(sbp->s_c_block_max); |
| 744 | |
Ryusuke Konishi | 7c01745 | 2010-07-05 20:08:33 +0900 | [diff] [blame] | 745 | return !parse_options(data, sb, 0) ? -EINVAL : 0 ; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 746 | } |
| 747 | |
Ryusuke Konishi | c5ca48a | 2010-07-22 03:22:20 +0900 | [diff] [blame] | 748 | int nilfs_check_feature_compatibility(struct super_block *sb, |
| 749 | struct nilfs_super_block *sbp) |
| 750 | { |
| 751 | __u64 features; |
| 752 | |
| 753 | features = le64_to_cpu(sbp->s_feature_incompat) & |
| 754 | ~NILFS_FEATURE_INCOMPAT_SUPP; |
| 755 | if (features) { |
| 756 | printk(KERN_ERR "NILFS: couldn't mount because of unsupported " |
| 757 | "optional features (%llx)\n", |
| 758 | (unsigned long long)features); |
| 759 | return -EINVAL; |
| 760 | } |
| 761 | features = le64_to_cpu(sbp->s_feature_compat_ro) & |
| 762 | ~NILFS_FEATURE_COMPAT_RO_SUPP; |
| 763 | if (!(sb->s_flags & MS_RDONLY) && features) { |
| 764 | printk(KERN_ERR "NILFS: couldn't mount RDWR because of " |
| 765 | "unsupported optional features (%llx)\n", |
| 766 | (unsigned long long)features); |
| 767 | return -EINVAL; |
| 768 | } |
| 769 | return 0; |
| 770 | } |
| 771 | |
Ryusuke Konishi | 367ea33 | 2010-08-26 01:52:51 +0900 | [diff] [blame] | 772 | static int nilfs_get_root_dentry(struct super_block *sb, |
| 773 | struct nilfs_root *root, |
| 774 | struct dentry **root_dentry) |
| 775 | { |
| 776 | struct inode *inode; |
| 777 | struct dentry *dentry; |
| 778 | int ret = 0; |
| 779 | |
| 780 | inode = nilfs_iget(sb, root, NILFS_ROOT_INO); |
| 781 | if (IS_ERR(inode)) { |
| 782 | printk(KERN_ERR "NILFS: get root inode failed\n"); |
| 783 | ret = PTR_ERR(inode); |
| 784 | goto out; |
| 785 | } |
| 786 | if (!S_ISDIR(inode->i_mode) || !inode->i_blocks || !inode->i_size) { |
| 787 | iput(inode); |
| 788 | printk(KERN_ERR "NILFS: corrupt root inode.\n"); |
| 789 | ret = -EINVAL; |
| 790 | goto out; |
| 791 | } |
| 792 | |
Ryusuke Konishi | f11459a | 2010-08-16 01:54:52 +0900 | [diff] [blame] | 793 | if (root->cno == NILFS_CPTREE_CURRENT_CNO) { |
| 794 | dentry = d_find_alias(inode); |
| 795 | if (!dentry) { |
| 796 | dentry = d_alloc_root(inode); |
| 797 | if (!dentry) { |
| 798 | iput(inode); |
| 799 | ret = -ENOMEM; |
| 800 | goto failed_dentry; |
| 801 | } |
| 802 | } else { |
| 803 | iput(inode); |
| 804 | } |
| 805 | } else { |
| 806 | dentry = d_obtain_alias(inode); |
| 807 | if (IS_ERR(dentry)) { |
| 808 | ret = PTR_ERR(dentry); |
| 809 | goto failed_dentry; |
| 810 | } |
Ryusuke Konishi | 367ea33 | 2010-08-26 01:52:51 +0900 | [diff] [blame] | 811 | } |
| 812 | *root_dentry = dentry; |
| 813 | out: |
| 814 | return ret; |
Ryusuke Konishi | f11459a | 2010-08-16 01:54:52 +0900 | [diff] [blame] | 815 | |
| 816 | failed_dentry: |
| 817 | printk(KERN_ERR "NILFS: get root dentry failed\n"); |
| 818 | goto out; |
Ryusuke Konishi | 367ea33 | 2010-08-26 01:52:51 +0900 | [diff] [blame] | 819 | } |
| 820 | |
Ryusuke Konishi | ab4d8f7 | 2010-08-26 02:15:41 +0900 | [diff] [blame] | 821 | static int nilfs_attach_snapshot(struct super_block *s, __u64 cno, |
| 822 | struct dentry **root_dentry) |
| 823 | { |
| 824 | struct the_nilfs *nilfs = NILFS_SB(s)->s_nilfs; |
| 825 | struct nilfs_root *root; |
| 826 | int ret; |
| 827 | |
| 828 | down_read(&nilfs->ns_segctor_sem); |
| 829 | ret = nilfs_cpfile_is_snapshot(nilfs->ns_cpfile, cno); |
| 830 | up_read(&nilfs->ns_segctor_sem); |
| 831 | if (ret < 0) { |
| 832 | ret = (ret == -ENOENT) ? -EINVAL : ret; |
| 833 | goto out; |
| 834 | } else if (!ret) { |
| 835 | printk(KERN_ERR "NILFS: The specified checkpoint is " |
| 836 | "not a snapshot (checkpoint number=%llu).\n", |
| 837 | (unsigned long long)cno); |
| 838 | ret = -EINVAL; |
| 839 | goto out; |
| 840 | } |
| 841 | |
| 842 | ret = nilfs_attach_checkpoint(NILFS_SB(s), cno, false, &root); |
| 843 | if (ret) { |
| 844 | printk(KERN_ERR "NILFS: error loading snapshot " |
| 845 | "(checkpoint number=%llu).\n", |
| 846 | (unsigned long long)cno); |
| 847 | goto out; |
| 848 | } |
| 849 | ret = nilfs_get_root_dentry(s, root, root_dentry); |
| 850 | nilfs_put_root(root); |
| 851 | out: |
| 852 | return ret; |
| 853 | } |
| 854 | |
Ryusuke Konishi | f11459a | 2010-08-16 01:54:52 +0900 | [diff] [blame] | 855 | static int nilfs_tree_was_touched(struct dentry *root_dentry) |
| 856 | { |
Nick Piggin | b7ab39f | 2011-01-07 17:49:32 +1100 | [diff] [blame] | 857 | return root_dentry->d_count > 1; |
Ryusuke Konishi | f11459a | 2010-08-16 01:54:52 +0900 | [diff] [blame] | 858 | } |
| 859 | |
| 860 | /** |
| 861 | * nilfs_try_to_shrink_tree() - try to shrink dentries of a checkpoint |
| 862 | * @root_dentry: root dentry of the tree to be shrunk |
| 863 | * |
| 864 | * This function returns true if the tree was in-use. |
| 865 | */ |
| 866 | static int nilfs_try_to_shrink_tree(struct dentry *root_dentry) |
| 867 | { |
| 868 | if (have_submounts(root_dentry)) |
| 869 | return true; |
| 870 | shrink_dcache_parent(root_dentry); |
| 871 | return nilfs_tree_was_touched(root_dentry); |
| 872 | } |
| 873 | |
Ryusuke Konishi | 032dbb3 | 2010-09-13 11:16:34 +0900 | [diff] [blame] | 874 | int nilfs_checkpoint_is_mounted(struct super_block *sb, __u64 cno) |
| 875 | { |
| 876 | struct the_nilfs *nilfs = NILFS_SB(sb)->s_nilfs; |
| 877 | struct nilfs_root *root; |
| 878 | struct inode *inode; |
| 879 | struct dentry *dentry; |
| 880 | int ret; |
| 881 | |
| 882 | if (cno < 0 || cno > nilfs->ns_cno) |
| 883 | return false; |
| 884 | |
| 885 | if (cno >= nilfs_last_cno(nilfs)) |
| 886 | return true; /* protect recent checkpoints */ |
| 887 | |
| 888 | ret = false; |
| 889 | root = nilfs_lookup_root(NILFS_SB(sb)->s_nilfs, cno); |
| 890 | if (root) { |
| 891 | inode = nilfs_ilookup(sb, root, NILFS_ROOT_INO); |
| 892 | if (inode) { |
| 893 | dentry = d_find_alias(inode); |
| 894 | if (dentry) { |
| 895 | if (nilfs_tree_was_touched(dentry)) |
| 896 | ret = nilfs_try_to_shrink_tree(dentry); |
| 897 | dput(dentry); |
| 898 | } |
| 899 | iput(inode); |
| 900 | } |
| 901 | nilfs_put_root(root); |
| 902 | } |
| 903 | return ret; |
| 904 | } |
| 905 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 906 | /** |
| 907 | * nilfs_fill_super() - initialize a super block instance |
| 908 | * @sb: super_block |
| 909 | * @data: mount options |
| 910 | * @silent: silent mode flag |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 911 | * |
Ryusuke Konishi | aa7dfb8 | 2009-06-08 01:39:33 +0900 | [diff] [blame] | 912 | * This function is called exclusively by nilfs->ns_mount_mutex. |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 913 | * So, the recovery process is protected from other simultaneous mounts. |
| 914 | */ |
| 915 | static int |
Ryusuke Konishi | 348fe8d | 2010-09-09 02:07:56 +0900 | [diff] [blame] | 916 | nilfs_fill_super(struct super_block *sb, void *data, int silent) |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 917 | { |
Ryusuke Konishi | 348fe8d | 2010-09-09 02:07:56 +0900 | [diff] [blame] | 918 | struct the_nilfs *nilfs; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 919 | struct nilfs_sb_info *sbi; |
Ryusuke Konishi | 4d8d929 | 2010-08-25 17:45:44 +0900 | [diff] [blame] | 920 | struct nilfs_root *fsroot; |
Ryusuke Konishi | 026a7d6 | 2010-10-07 14:19:48 +0900 | [diff] [blame] | 921 | struct backing_dev_info *bdi; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 922 | __u64 cno; |
| 923 | int err; |
| 924 | |
| 925 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); |
| 926 | if (!sbi) |
| 927 | return -ENOMEM; |
| 928 | |
| 929 | sb->s_fs_info = sbi; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 930 | sbi->s_super = sb; |
| 931 | |
Ryusuke Konishi | 348fe8d | 2010-09-09 02:07:56 +0900 | [diff] [blame] | 932 | nilfs = alloc_nilfs(sb->s_bdev); |
| 933 | if (!nilfs) { |
| 934 | err = -ENOMEM; |
| 935 | goto failed_sbi; |
| 936 | } |
| 937 | sbi->s_nilfs = nilfs; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 938 | |
| 939 | err = init_nilfs(nilfs, sbi, (char *)data); |
| 940 | if (err) |
Ryusuke Konishi | 348fe8d | 2010-09-09 02:07:56 +0900 | [diff] [blame] | 941 | goto failed_nilfs; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 942 | |
| 943 | spin_lock_init(&sbi->s_inode_lock); |
| 944 | INIT_LIST_HEAD(&sbi->s_dirty_files); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 945 | |
| 946 | /* |
| 947 | * Following initialization is overlapped because |
| 948 | * nilfs_sb_info structure has been cleared at the beginning. |
| 949 | * But we reserve them to keep our interest and make ready |
| 950 | * for the future change. |
| 951 | */ |
| 952 | get_random_bytes(&sbi->s_next_generation, |
| 953 | sizeof(sbi->s_next_generation)); |
| 954 | spin_lock_init(&sbi->s_next_gen_lock); |
| 955 | |
| 956 | sb->s_op = &nilfs_sops; |
| 957 | sb->s_export_op = &nilfs_export_ops; |
| 958 | sb->s_root = NULL; |
Ryusuke Konishi | 6123923 | 2009-04-06 19:02:00 -0700 | [diff] [blame] | 959 | sb->s_time_gran = 1; |
Ryusuke Konishi | 026a7d6 | 2010-10-07 14:19:48 +0900 | [diff] [blame] | 960 | |
| 961 | bdi = sb->s_bdev->bd_inode->i_mapping->backing_dev_info; |
| 962 | sb->s_bdi = bdi ? : &default_backing_dev_info; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 963 | |
Ryusuke Konishi | f50a4c8 | 2009-11-19 16:58:40 +0900 | [diff] [blame] | 964 | err = load_nilfs(nilfs, sbi); |
| 965 | if (err) |
Ryusuke Konishi | 348fe8d | 2010-09-09 02:07:56 +0900 | [diff] [blame] | 966 | goto failed_nilfs; |
Ryusuke Konishi | f50a4c8 | 2009-11-19 16:58:40 +0900 | [diff] [blame] | 967 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 968 | cno = nilfs_last_cno(nilfs); |
Ryusuke Konishi | ab4d8f7 | 2010-08-26 02:15:41 +0900 | [diff] [blame] | 969 | err = nilfs_attach_checkpoint(sbi, cno, true, &fsroot); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 970 | if (err) { |
Ryusuke Konishi | f11459a | 2010-08-16 01:54:52 +0900 | [diff] [blame] | 971 | printk(KERN_ERR "NILFS: error loading last checkpoint " |
| 972 | "(checkpoint number=%llu).\n", (unsigned long long)cno); |
Ryusuke Konishi | f1e89c8 | 2010-09-05 12:20:59 +0900 | [diff] [blame] | 973 | goto failed_unload; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 974 | } |
| 975 | |
| 976 | if (!(sb->s_flags & MS_RDONLY)) { |
Ryusuke Konishi | e912a5b | 2010-08-14 13:07:15 +0900 | [diff] [blame] | 977 | err = nilfs_attach_segment_constructor(sbi, fsroot); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 978 | if (err) |
| 979 | goto failed_checkpoint; |
| 980 | } |
| 981 | |
Ryusuke Konishi | 367ea33 | 2010-08-26 01:52:51 +0900 | [diff] [blame] | 982 | err = nilfs_get_root_dentry(sb, fsroot, &sb->s_root); |
| 983 | if (err) |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 984 | goto failed_segctor; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 985 | |
Ryusuke Konishi | 4d8d929 | 2010-08-25 17:45:44 +0900 | [diff] [blame] | 986 | nilfs_put_root(fsroot); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 987 | |
| 988 | if (!(sb->s_flags & MS_RDONLY)) { |
| 989 | down_write(&nilfs->ns_sem); |
Ryusuke Konishi | 5beb6e0 | 2010-09-20 18:19:06 +0900 | [diff] [blame] | 990 | nilfs_setup_super(sbi, true); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 991 | up_write(&nilfs->ns_sem); |
| 992 | } |
| 993 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 994 | return 0; |
| 995 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 996 | failed_segctor: |
| 997 | nilfs_detach_segment_constructor(sbi); |
| 998 | |
| 999 | failed_checkpoint: |
Ryusuke Konishi | 4d8d929 | 2010-08-25 17:45:44 +0900 | [diff] [blame] | 1000 | nilfs_put_root(fsroot); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1001 | |
Ryusuke Konishi | f1e89c8 | 2010-09-05 12:20:59 +0900 | [diff] [blame] | 1002 | failed_unload: |
| 1003 | iput(nilfs->ns_sufile); |
| 1004 | iput(nilfs->ns_cpfile); |
| 1005 | iput(nilfs->ns_dat); |
| 1006 | |
Ryusuke Konishi | 348fe8d | 2010-09-09 02:07:56 +0900 | [diff] [blame] | 1007 | failed_nilfs: |
| 1008 | destroy_nilfs(nilfs); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1009 | |
| 1010 | failed_sbi: |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1011 | sb->s_fs_info = NULL; |
Ryusuke Konishi | f11459a | 2010-08-16 01:54:52 +0900 | [diff] [blame] | 1012 | kfree(sbi); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1013 | return err; |
| 1014 | } |
| 1015 | |
| 1016 | static int nilfs_remount(struct super_block *sb, int *flags, char *data) |
| 1017 | { |
| 1018 | struct nilfs_sb_info *sbi = NILFS_SB(sb); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1019 | struct the_nilfs *nilfs = sbi->s_nilfs; |
| 1020 | unsigned long old_sb_flags; |
Ryusuke Konishi | 06df0f9 | 2010-12-27 00:04:06 +0900 | [diff] [blame] | 1021 | unsigned long old_mount_opt; |
Ryusuke Konishi | f11459a | 2010-08-16 01:54:52 +0900 | [diff] [blame] | 1022 | int err; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1023 | |
| 1024 | old_sb_flags = sb->s_flags; |
Ryusuke Konishi | 06df0f9 | 2010-12-27 00:04:06 +0900 | [diff] [blame] | 1025 | old_mount_opt = sbi->s_mount_opt; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1026 | |
Ryusuke Konishi | 7c01745 | 2010-07-05 20:08:33 +0900 | [diff] [blame] | 1027 | if (!parse_options(data, sb, 1)) { |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1028 | err = -EINVAL; |
| 1029 | goto restore_opts; |
| 1030 | } |
| 1031 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL); |
| 1032 | |
Ryusuke Konishi | d240e06 | 2010-05-09 21:51:53 +0900 | [diff] [blame] | 1033 | err = -EINVAL; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1034 | |
Ryusuke Konishi | 0234576 | 2009-11-20 03:28:01 +0900 | [diff] [blame] | 1035 | if (!nilfs_valid_fs(nilfs)) { |
| 1036 | printk(KERN_WARNING "NILFS (device %s): couldn't " |
| 1037 | "remount because the filesystem is in an " |
| 1038 | "incomplete recovery state.\n", sb->s_id); |
Ryusuke Konishi | 0234576 | 2009-11-20 03:28:01 +0900 | [diff] [blame] | 1039 | goto restore_opts; |
| 1040 | } |
| 1041 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1042 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
| 1043 | goto out; |
| 1044 | if (*flags & MS_RDONLY) { |
| 1045 | /* Shutting down the segment constructor */ |
| 1046 | nilfs_detach_segment_constructor(sbi); |
| 1047 | sb->s_flags |= MS_RDONLY; |
| 1048 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1049 | /* |
| 1050 | * Remounting a valid RW partition RDONLY, so set |
| 1051 | * the RDONLY flag and then mark the partition as valid again. |
| 1052 | */ |
| 1053 | down_write(&nilfs->ns_sem); |
Ryusuke Konishi | 7ecaa46 | 2010-06-28 17:49:29 +0900 | [diff] [blame] | 1054 | nilfs_cleanup_super(sbi); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1055 | up_write(&nilfs->ns_sem); |
| 1056 | } else { |
Ryusuke Konishi | c5ca48a | 2010-07-22 03:22:20 +0900 | [diff] [blame] | 1057 | __u64 features; |
Ryusuke Konishi | e912a5b | 2010-08-14 13:07:15 +0900 | [diff] [blame] | 1058 | struct nilfs_root *root; |
Ryusuke Konishi | c5ca48a | 2010-07-22 03:22:20 +0900 | [diff] [blame] | 1059 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1060 | /* |
| 1061 | * Mounting a RDONLY partition read-write, so reread and |
| 1062 | * store the current valid flag. (It may have been changed |
| 1063 | * by fsck since we originally mounted the partition.) |
| 1064 | */ |
Ryusuke Konishi | c5ca48a | 2010-07-22 03:22:20 +0900 | [diff] [blame] | 1065 | down_read(&nilfs->ns_sem); |
| 1066 | features = le64_to_cpu(nilfs->ns_sbp[0]->s_feature_compat_ro) & |
| 1067 | ~NILFS_FEATURE_COMPAT_RO_SUPP; |
| 1068 | up_read(&nilfs->ns_sem); |
| 1069 | if (features) { |
| 1070 | printk(KERN_WARNING "NILFS (device %s): couldn't " |
| 1071 | "remount RDWR because of unsupported optional " |
| 1072 | "features (%llx)\n", |
| 1073 | sb->s_id, (unsigned long long)features); |
| 1074 | err = -EROFS; |
| 1075 | goto restore_opts; |
| 1076 | } |
| 1077 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1078 | sb->s_flags &= ~MS_RDONLY; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1079 | |
Ryusuke Konishi | e912a5b | 2010-08-14 13:07:15 +0900 | [diff] [blame] | 1080 | root = NILFS_I(sb->s_root->d_inode)->i_root; |
| 1081 | err = nilfs_attach_segment_constructor(sbi, root); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1082 | if (err) |
Ryusuke Konishi | e59399d | 2009-06-08 01:39:32 +0900 | [diff] [blame] | 1083 | goto restore_opts; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1084 | |
| 1085 | down_write(&nilfs->ns_sem); |
Ryusuke Konishi | 5beb6e0 | 2010-09-20 18:19:06 +0900 | [diff] [blame] | 1086 | nilfs_setup_super(sbi, true); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1087 | up_write(&nilfs->ns_sem); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1088 | } |
| 1089 | out: |
| 1090 | return 0; |
| 1091 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1092 | restore_opts: |
| 1093 | sb->s_flags = old_sb_flags; |
Ryusuke Konishi | 06df0f9 | 2010-12-27 00:04:06 +0900 | [diff] [blame] | 1094 | sbi->s_mount_opt = old_mount_opt; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1095 | return err; |
| 1096 | } |
| 1097 | |
| 1098 | struct nilfs_super_data { |
| 1099 | struct block_device *bdev; |
Ryusuke Konishi | 6dd4740 | 2009-06-08 01:39:31 +0900 | [diff] [blame] | 1100 | struct nilfs_sb_info *sbi; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1101 | __u64 cno; |
| 1102 | int flags; |
| 1103 | }; |
| 1104 | |
| 1105 | /** |
| 1106 | * nilfs_identify - pre-read mount options needed to identify mount instance |
| 1107 | * @data: mount options |
| 1108 | * @sd: nilfs_super_data |
| 1109 | */ |
| 1110 | static int nilfs_identify(char *data, struct nilfs_super_data *sd) |
| 1111 | { |
| 1112 | char *p, *options = data; |
| 1113 | substring_t args[MAX_OPT_ARGS]; |
Ryusuke Konishi | c05dbfc | 2010-09-16 00:36:24 +0900 | [diff] [blame] | 1114 | int token; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1115 | int ret = 0; |
| 1116 | |
| 1117 | do { |
| 1118 | p = strsep(&options, ","); |
| 1119 | if (p != NULL && *p) { |
| 1120 | token = match_token(p, tokens, args); |
| 1121 | if (token == Opt_snapshot) { |
Ryusuke Konishi | c05dbfc | 2010-09-16 00:36:24 +0900 | [diff] [blame] | 1122 | if (!(sd->flags & MS_RDONLY)) { |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1123 | ret++; |
Ryusuke Konishi | c05dbfc | 2010-09-16 00:36:24 +0900 | [diff] [blame] | 1124 | } else { |
| 1125 | sd->cno = simple_strtoull(args[0].from, |
| 1126 | NULL, 0); |
| 1127 | /* |
| 1128 | * No need to see the end pointer; |
| 1129 | * match_token() has done syntax |
| 1130 | * checking. |
| 1131 | */ |
| 1132 | if (sd->cno == 0) |
| 1133 | ret++; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1134 | } |
| 1135 | } |
| 1136 | if (ret) |
| 1137 | printk(KERN_ERR |
| 1138 | "NILFS: invalid mount option: %s\n", p); |
| 1139 | } |
| 1140 | if (!options) |
| 1141 | break; |
| 1142 | BUG_ON(options == data); |
| 1143 | *(options - 1) = ','; |
| 1144 | } while (!ret); |
| 1145 | return ret; |
| 1146 | } |
| 1147 | |
| 1148 | static int nilfs_set_bdev_super(struct super_block *s, void *data) |
| 1149 | { |
Ryusuke Konishi | f11459a | 2010-08-16 01:54:52 +0900 | [diff] [blame] | 1150 | s->s_bdev = data; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1151 | s->s_dev = s->s_bdev->bd_dev; |
| 1152 | return 0; |
| 1153 | } |
| 1154 | |
| 1155 | static int nilfs_test_bdev_super(struct super_block *s, void *data) |
| 1156 | { |
Ryusuke Konishi | f11459a | 2010-08-16 01:54:52 +0900 | [diff] [blame] | 1157 | return (void *)s->s_bdev == data; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1158 | } |
| 1159 | |
Al Viro | e4c59d6 | 2010-07-26 12:19:34 +0400 | [diff] [blame] | 1160 | static struct dentry * |
| 1161 | nilfs_mount(struct file_system_type *fs_type, int flags, |
| 1162 | const char *dev_name, void *data) |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1163 | { |
| 1164 | struct nilfs_super_data sd; |
Ryusuke Konishi | 33c8e57 | 2009-06-08 01:39:29 +0900 | [diff] [blame] | 1165 | struct super_block *s; |
Tejun Heo | d4d7762 | 2010-11-13 11:55:18 +0100 | [diff] [blame] | 1166 | fmode_t mode = FMODE_READ | FMODE_EXCL; |
Ryusuke Konishi | f11459a | 2010-08-16 01:54:52 +0900 | [diff] [blame] | 1167 | struct dentry *root_dentry; |
| 1168 | int err, s_new = false; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1169 | |
Ryusuke Konishi | 13e9055 | 2010-05-09 02:57:57 +0900 | [diff] [blame] | 1170 | if (!(flags & MS_RDONLY)) |
| 1171 | mode |= FMODE_WRITE; |
| 1172 | |
Tejun Heo | d4d7762 | 2010-11-13 11:55:18 +0100 | [diff] [blame] | 1173 | sd.bdev = blkdev_get_by_path(dev_name, mode, fs_type); |
Jan Blunck | d6d4c19 | 2010-02-24 13:25:32 +0100 | [diff] [blame] | 1174 | if (IS_ERR(sd.bdev)) |
Al Viro | e4c59d6 | 2010-07-26 12:19:34 +0400 | [diff] [blame] | 1175 | return ERR_CAST(sd.bdev); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1176 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1177 | sd.cno = 0; |
| 1178 | sd.flags = flags; |
| 1179 | if (nilfs_identify((char *)data, &sd)) { |
| 1180 | err = -EINVAL; |
| 1181 | goto failed; |
| 1182 | } |
| 1183 | |
Ryusuke Konishi | 5beb6e0 | 2010-09-20 18:19:06 +0900 | [diff] [blame] | 1184 | /* |
| 1185 | * once the super is inserted into the list by sget, s_umount |
| 1186 | * will protect the lockfs code from trying to start a snapshot |
| 1187 | * while we are mounting |
| 1188 | */ |
| 1189 | mutex_lock(&sd.bdev->bd_fsfreeze_mutex); |
| 1190 | if (sd.bdev->bd_fsfreeze_count > 0) { |
| 1191 | mutex_unlock(&sd.bdev->bd_fsfreeze_mutex); |
| 1192 | err = -EBUSY; |
Ryusuke Konishi | 33c8e57 | 2009-06-08 01:39:29 +0900 | [diff] [blame] | 1193 | goto failed; |
| 1194 | } |
Ryusuke Konishi | f11459a | 2010-08-16 01:54:52 +0900 | [diff] [blame] | 1195 | s = sget(fs_type, nilfs_test_bdev_super, nilfs_set_bdev_super, sd.bdev); |
Ryusuke Konishi | 5beb6e0 | 2010-09-20 18:19:06 +0900 | [diff] [blame] | 1196 | mutex_unlock(&sd.bdev->bd_fsfreeze_mutex); |
Ryusuke Konishi | 33c8e57 | 2009-06-08 01:39:29 +0900 | [diff] [blame] | 1197 | if (IS_ERR(s)) { |
| 1198 | err = PTR_ERR(s); |
Ryusuke Konishi | 348fe8d | 2010-09-09 02:07:56 +0900 | [diff] [blame] | 1199 | goto failed; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1200 | } |
| 1201 | |
| 1202 | if (!s->s_root) { |
| 1203 | char b[BDEVNAME_SIZE]; |
| 1204 | |
Ryusuke Konishi | f11459a | 2010-08-16 01:54:52 +0900 | [diff] [blame] | 1205 | s_new = true; |
| 1206 | |
Ryusuke Konishi | 33c8e57 | 2009-06-08 01:39:29 +0900 | [diff] [blame] | 1207 | /* New superblock instance created */ |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1208 | s->s_flags = flags; |
Ryusuke Konishi | 4571b82 | 2010-05-09 03:01:32 +0900 | [diff] [blame] | 1209 | s->s_mode = mode; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1210 | strlcpy(s->s_id, bdevname(sd.bdev, b), sizeof(s->s_id)); |
| 1211 | sb_set_blocksize(s, block_size(sd.bdev)); |
| 1212 | |
Ryusuke Konishi | 348fe8d | 2010-09-09 02:07:56 +0900 | [diff] [blame] | 1213 | err = nilfs_fill_super(s, data, flags & MS_SILENT ? 1 : 0); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1214 | if (err) |
Ryusuke Konishi | 348fe8d | 2010-09-09 02:07:56 +0900 | [diff] [blame] | 1215 | goto failed_super; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1216 | |
| 1217 | s->s_flags |= MS_ACTIVE; |
Ryusuke Konishi | f11459a | 2010-08-16 01:54:52 +0900 | [diff] [blame] | 1218 | } else if (!sd.cno) { |
| 1219 | int busy = false; |
| 1220 | |
| 1221 | if (nilfs_tree_was_touched(s->s_root)) { |
| 1222 | busy = nilfs_try_to_shrink_tree(s->s_root); |
| 1223 | if (busy && (flags ^ s->s_flags) & MS_RDONLY) { |
| 1224 | printk(KERN_ERR "NILFS: the device already " |
| 1225 | "has a %s mount.\n", |
| 1226 | (s->s_flags & MS_RDONLY) ? |
| 1227 | "read-only" : "read/write"); |
| 1228 | err = -EBUSY; |
| 1229 | goto failed_super; |
| 1230 | } |
| 1231 | } |
| 1232 | if (!busy) { |
| 1233 | /* |
| 1234 | * Try remount to setup mount states if the current |
| 1235 | * tree is not mounted and only snapshots use this sb. |
| 1236 | */ |
| 1237 | err = nilfs_remount(s, &flags, data); |
| 1238 | if (err) |
| 1239 | goto failed_super; |
| 1240 | } |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1241 | } |
| 1242 | |
Ryusuke Konishi | f11459a | 2010-08-16 01:54:52 +0900 | [diff] [blame] | 1243 | if (sd.cno) { |
| 1244 | err = nilfs_attach_snapshot(s, sd.cno, &root_dentry); |
Ryusuke Konishi | 348fe8d | 2010-09-09 02:07:56 +0900 | [diff] [blame] | 1245 | if (err) |
Ryusuke Konishi | f11459a | 2010-08-16 01:54:52 +0900 | [diff] [blame] | 1246 | goto failed_super; |
Ryusuke Konishi | f11459a | 2010-08-16 01:54:52 +0900 | [diff] [blame] | 1247 | } else { |
| 1248 | root_dentry = dget(s->s_root); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1249 | } |
| 1250 | |
Ryusuke Konishi | f11459a | 2010-08-16 01:54:52 +0900 | [diff] [blame] | 1251 | if (!s_new) |
Tejun Heo | d4d7762 | 2010-11-13 11:55:18 +0100 | [diff] [blame] | 1252 | blkdev_put(sd.bdev, mode); |
Ryusuke Konishi | f11459a | 2010-08-16 01:54:52 +0900 | [diff] [blame] | 1253 | |
Al Viro | e4c59d6 | 2010-07-26 12:19:34 +0400 | [diff] [blame] | 1254 | return root_dentry; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1255 | |
Ryusuke Konishi | f11459a | 2010-08-16 01:54:52 +0900 | [diff] [blame] | 1256 | failed_super: |
Al Viro | a95161a | 2009-08-09 00:52:02 +0400 | [diff] [blame] | 1257 | deactivate_locked_super(s); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1258 | |
Ryusuke Konishi | 348fe8d | 2010-09-09 02:07:56 +0900 | [diff] [blame] | 1259 | failed: |
| 1260 | if (!s_new) |
Tejun Heo | d4d7762 | 2010-11-13 11:55:18 +0100 | [diff] [blame] | 1261 | blkdev_put(sd.bdev, mode); |
Al Viro | e4c59d6 | 2010-07-26 12:19:34 +0400 | [diff] [blame] | 1262 | return ERR_PTR(err); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1263 | } |
| 1264 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1265 | struct file_system_type nilfs_fs_type = { |
| 1266 | .owner = THIS_MODULE, |
| 1267 | .name = "nilfs2", |
Al Viro | e4c59d6 | 2010-07-26 12:19:34 +0400 | [diff] [blame] | 1268 | .mount = nilfs_mount, |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1269 | .kill_sb = kill_block_super, |
| 1270 | .fs_flags = FS_REQUIRES_DEV, |
| 1271 | }; |
| 1272 | |
Li Hong | 41c88bd | 2010-04-06 00:54:11 +0800 | [diff] [blame] | 1273 | static void nilfs_inode_init_once(void *obj) |
| 1274 | { |
| 1275 | struct nilfs_inode_info *ii = obj; |
| 1276 | |
| 1277 | INIT_LIST_HEAD(&ii->i_dirty); |
| 1278 | #ifdef CONFIG_NILFS_XATTR |
| 1279 | init_rwsem(&ii->xattr_sem); |
| 1280 | #endif |
| 1281 | nilfs_btnode_cache_init_once(&ii->i_btnode_cache); |
Ryusuke Konishi | 05d0e94 | 2010-07-10 20:52:09 +0900 | [diff] [blame] | 1282 | ii->i_bmap = &ii->i_bmap_data; |
Li Hong | 41c88bd | 2010-04-06 00:54:11 +0800 | [diff] [blame] | 1283 | inode_init_once(&ii->vfs_inode); |
| 1284 | } |
| 1285 | |
| 1286 | static void nilfs_segbuf_init_once(void *obj) |
| 1287 | { |
| 1288 | memset(obj, 0, sizeof(struct nilfs_segment_buffer)); |
| 1289 | } |
| 1290 | |
| 1291 | static void nilfs_destroy_cachep(void) |
| 1292 | { |
Ryusuke Konishi | 84cb099 | 2010-05-22 12:49:32 +0900 | [diff] [blame] | 1293 | if (nilfs_inode_cachep) |
Li Hong | 41c88bd | 2010-04-06 00:54:11 +0800 | [diff] [blame] | 1294 | kmem_cache_destroy(nilfs_inode_cachep); |
Ryusuke Konishi | 84cb099 | 2010-05-22 12:49:32 +0900 | [diff] [blame] | 1295 | if (nilfs_transaction_cachep) |
Li Hong | 41c88bd | 2010-04-06 00:54:11 +0800 | [diff] [blame] | 1296 | kmem_cache_destroy(nilfs_transaction_cachep); |
Ryusuke Konishi | 84cb099 | 2010-05-22 12:49:32 +0900 | [diff] [blame] | 1297 | if (nilfs_segbuf_cachep) |
Li Hong | 41c88bd | 2010-04-06 00:54:11 +0800 | [diff] [blame] | 1298 | kmem_cache_destroy(nilfs_segbuf_cachep); |
Ryusuke Konishi | 84cb099 | 2010-05-22 12:49:32 +0900 | [diff] [blame] | 1299 | if (nilfs_btree_path_cache) |
Li Hong | 41c88bd | 2010-04-06 00:54:11 +0800 | [diff] [blame] | 1300 | kmem_cache_destroy(nilfs_btree_path_cache); |
| 1301 | } |
| 1302 | |
| 1303 | static int __init nilfs_init_cachep(void) |
| 1304 | { |
| 1305 | nilfs_inode_cachep = kmem_cache_create("nilfs2_inode_cache", |
| 1306 | sizeof(struct nilfs_inode_info), 0, |
| 1307 | SLAB_RECLAIM_ACCOUNT, nilfs_inode_init_once); |
| 1308 | if (!nilfs_inode_cachep) |
| 1309 | goto fail; |
| 1310 | |
| 1311 | nilfs_transaction_cachep = kmem_cache_create("nilfs2_transaction_cache", |
| 1312 | sizeof(struct nilfs_transaction_info), 0, |
| 1313 | SLAB_RECLAIM_ACCOUNT, NULL); |
| 1314 | if (!nilfs_transaction_cachep) |
| 1315 | goto fail; |
| 1316 | |
| 1317 | nilfs_segbuf_cachep = kmem_cache_create("nilfs2_segbuf_cache", |
| 1318 | sizeof(struct nilfs_segment_buffer), 0, |
| 1319 | SLAB_RECLAIM_ACCOUNT, nilfs_segbuf_init_once); |
| 1320 | if (!nilfs_segbuf_cachep) |
| 1321 | goto fail; |
| 1322 | |
| 1323 | nilfs_btree_path_cache = kmem_cache_create("nilfs2_btree_path_cache", |
| 1324 | sizeof(struct nilfs_btree_path) * NILFS_BTREE_LEVEL_MAX, |
| 1325 | 0, 0, NULL); |
| 1326 | if (!nilfs_btree_path_cache) |
| 1327 | goto fail; |
| 1328 | |
| 1329 | return 0; |
| 1330 | |
| 1331 | fail: |
| 1332 | nilfs_destroy_cachep(); |
| 1333 | return -ENOMEM; |
| 1334 | } |
| 1335 | |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1336 | static int __init init_nilfs_fs(void) |
| 1337 | { |
| 1338 | int err; |
| 1339 | |
Li Hong | 41c88bd | 2010-04-06 00:54:11 +0800 | [diff] [blame] | 1340 | err = nilfs_init_cachep(); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1341 | if (err) |
Li Hong | 41c88bd | 2010-04-06 00:54:11 +0800 | [diff] [blame] | 1342 | goto fail; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1343 | |
| 1344 | err = register_filesystem(&nilfs_fs_type); |
| 1345 | if (err) |
Li Hong | 41c88bd | 2010-04-06 00:54:11 +0800 | [diff] [blame] | 1346 | goto free_cachep; |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1347 | |
Li Hong | 9f13026 | 2010-04-09 23:09:53 +0800 | [diff] [blame] | 1348 | printk(KERN_INFO "NILFS version 2 loaded\n"); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1349 | return 0; |
| 1350 | |
Li Hong | 41c88bd | 2010-04-06 00:54:11 +0800 | [diff] [blame] | 1351 | free_cachep: |
| 1352 | nilfs_destroy_cachep(); |
| 1353 | fail: |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1354 | return err; |
| 1355 | } |
| 1356 | |
| 1357 | static void __exit exit_nilfs_fs(void) |
| 1358 | { |
Li Hong | 41c88bd | 2010-04-06 00:54:11 +0800 | [diff] [blame] | 1359 | nilfs_destroy_cachep(); |
Ryusuke Konishi | 783f618 | 2009-04-06 19:01:35 -0700 | [diff] [blame] | 1360 | unregister_filesystem(&nilfs_fs_type); |
| 1361 | } |
| 1362 | |
| 1363 | module_init(init_nilfs_fs) |
| 1364 | module_exit(exit_nilfs_fs) |