Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/ext2/super.c |
| 3 | * |
| 4 | * Copyright (C) 1992, 1993, 1994, 1995 |
| 5 | * Remy Card (card@masi.ibp.fr) |
| 6 | * Laboratoire MASI - Institut Blaise Pascal |
| 7 | * Universite Pierre et Marie Curie (Paris VI) |
| 8 | * |
| 9 | * from |
| 10 | * |
| 11 | * linux/fs/minix/inode.c |
| 12 | * |
| 13 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 14 | * |
| 15 | * Big-endian to little-endian byte-swapping/bitmaps by |
| 16 | * David S. Miller (davem@caip.rutgers.edu), 1995 |
| 17 | */ |
| 18 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | #include <linux/module.h> |
| 20 | #include <linux/string.h> |
Mark Bellon | 8fc2751 | 2005-09-06 15:16:54 -0700 | [diff] [blame] | 21 | #include <linux/fs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 22 | #include <linux/slab.h> |
| 23 | #include <linux/init.h> |
| 24 | #include <linux/blkdev.h> |
| 25 | #include <linux/parser.h> |
| 26 | #include <linux/random.h> |
| 27 | #include <linux/buffer_head.h> |
Christoph Hellwig | a569425 | 2007-07-17 04:04:28 -0700 | [diff] [blame] | 28 | #include <linux/exportfs.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 29 | #include <linux/smp_lock.h> |
| 30 | #include <linux/vfs.h> |
Mark Bellon | 8fc2751 | 2005-09-06 15:16:54 -0700 | [diff] [blame] | 31 | #include <linux/seq_file.h> |
| 32 | #include <linux/mount.h> |
vignesh babu | d8ea6cf | 2007-10-16 23:27:14 -0700 | [diff] [blame] | 33 | #include <linux/log2.h> |
Jan Kara | 74abb98 | 2008-07-25 01:46:51 -0700 | [diff] [blame] | 34 | #include <linux/quotaops.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 35 | #include <asm/uaccess.h> |
| 36 | #include "ext2.h" |
| 37 | #include "xattr.h" |
| 38 | #include "acl.h" |
Carsten Otte | 6d79125 | 2005-06-23 22:05:26 -0700 | [diff] [blame] | 39 | #include "xip.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 40 | |
| 41 | static void ext2_sync_super(struct super_block *sb, |
| 42 | struct ext2_super_block *es); |
| 43 | static int ext2_remount (struct super_block * sb, int * flags, char * data); |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 44 | static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 45 | |
| 46 | void ext2_error (struct super_block * sb, const char * function, |
| 47 | const char * fmt, ...) |
| 48 | { |
| 49 | va_list args; |
| 50 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
| 51 | struct ext2_super_block *es = sbi->s_es; |
| 52 | |
| 53 | if (!(sb->s_flags & MS_RDONLY)) { |
| 54 | sbi->s_mount_state |= EXT2_ERROR_FS; |
Marcin Slusarz | 31f68e1 | 2008-04-28 02:16:00 -0700 | [diff] [blame] | 55 | es->s_state |= cpu_to_le16(EXT2_ERROR_FS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | ext2_sync_super(sb, es); |
| 57 | } |
| 58 | |
| 59 | va_start(args, fmt); |
| 60 | printk(KERN_CRIT "EXT2-fs error (device %s): %s: ",sb->s_id, function); |
| 61 | vprintk(fmt, args); |
| 62 | printk("\n"); |
| 63 | va_end(args); |
| 64 | |
| 65 | if (test_opt(sb, ERRORS_PANIC)) |
| 66 | panic("EXT2-fs panic from previous error\n"); |
| 67 | if (test_opt(sb, ERRORS_RO)) { |
| 68 | printk("Remounting filesystem read-only\n"); |
| 69 | sb->s_flags |= MS_RDONLY; |
| 70 | } |
| 71 | } |
| 72 | |
| 73 | void ext2_warning (struct super_block * sb, const char * function, |
| 74 | const char * fmt, ...) |
| 75 | { |
| 76 | va_list args; |
| 77 | |
| 78 | va_start(args, fmt); |
| 79 | printk(KERN_WARNING "EXT2-fs warning (device %s): %s: ", |
| 80 | sb->s_id, function); |
| 81 | vprintk(fmt, args); |
| 82 | printk("\n"); |
| 83 | va_end(args); |
| 84 | } |
| 85 | |
| 86 | void ext2_update_dynamic_rev(struct super_block *sb) |
| 87 | { |
| 88 | struct ext2_super_block *es = EXT2_SB(sb)->s_es; |
| 89 | |
| 90 | if (le32_to_cpu(es->s_rev_level) > EXT2_GOOD_OLD_REV) |
| 91 | return; |
| 92 | |
Harvey Harrison | 605afd6 | 2008-04-28 02:16:03 -0700 | [diff] [blame] | 93 | ext2_warning(sb, __func__, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 94 | "updating to rev %d because of new feature flag, " |
| 95 | "running e2fsck is recommended", |
| 96 | EXT2_DYNAMIC_REV); |
| 97 | |
| 98 | es->s_first_ino = cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO); |
| 99 | es->s_inode_size = cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE); |
| 100 | es->s_rev_level = cpu_to_le32(EXT2_DYNAMIC_REV); |
| 101 | /* leave es->s_feature_*compat flags alone */ |
| 102 | /* es->s_uuid will be set by e2fsck if empty */ |
| 103 | |
| 104 | /* |
| 105 | * The rest of the superblock fields should be zero, and if not it |
| 106 | * means they are likely already in use, so leave them alone. We |
| 107 | * can leave it up to e2fsck to clean up any inconsistencies there. |
| 108 | */ |
| 109 | } |
| 110 | |
| 111 | static void ext2_put_super (struct super_block * sb) |
| 112 | { |
| 113 | int db_count; |
| 114 | int i; |
| 115 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
| 116 | |
| 117 | ext2_xattr_put_super(sb); |
| 118 | if (!(sb->s_flags & MS_RDONLY)) { |
| 119 | struct ext2_super_block *es = sbi->s_es; |
| 120 | |
| 121 | es->s_state = cpu_to_le16(sbi->s_mount_state); |
| 122 | ext2_sync_super(sb, es); |
| 123 | } |
| 124 | db_count = sbi->s_gdb_count; |
| 125 | for (i = 0; i < db_count; i++) |
| 126 | if (sbi->s_group_desc[i]) |
| 127 | brelse (sbi->s_group_desc[i]); |
| 128 | kfree(sbi->s_group_desc); |
| 129 | kfree(sbi->s_debts); |
| 130 | percpu_counter_destroy(&sbi->s_freeblocks_counter); |
| 131 | percpu_counter_destroy(&sbi->s_freeinodes_counter); |
| 132 | percpu_counter_destroy(&sbi->s_dirs_counter); |
| 133 | brelse (sbi->s_sbh); |
| 134 | sb->s_fs_info = NULL; |
Pekka J Enberg | 18a82eb | 2009-01-07 18:07:19 -0800 | [diff] [blame] | 135 | kfree(sbi->s_blockgroup_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | kfree(sbi); |
| 137 | |
| 138 | return; |
| 139 | } |
| 140 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 141 | static struct kmem_cache * ext2_inode_cachep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 142 | |
| 143 | static struct inode *ext2_alloc_inode(struct super_block *sb) |
| 144 | { |
| 145 | struct ext2_inode_info *ei; |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 146 | ei = (struct ext2_inode_info *)kmem_cache_alloc(ext2_inode_cachep, GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 147 | if (!ei) |
| 148 | return NULL; |
| 149 | #ifdef CONFIG_EXT2_FS_POSIX_ACL |
| 150 | ei->i_acl = EXT2_ACL_NOT_CACHED; |
| 151 | ei->i_default_acl = EXT2_ACL_NOT_CACHED; |
| 152 | #endif |
Martin J. Bligh | a686cd8 | 2007-10-16 23:30:46 -0700 | [diff] [blame] | 153 | ei->i_block_alloc_info = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 154 | ei->vfs_inode.i_version = 1; |
| 155 | return &ei->vfs_inode; |
| 156 | } |
| 157 | |
| 158 | static void ext2_destroy_inode(struct inode *inode) |
| 159 | { |
| 160 | kmem_cache_free(ext2_inode_cachep, EXT2_I(inode)); |
| 161 | } |
| 162 | |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 163 | static void init_once(void *foo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 164 | { |
| 165 | struct ext2_inode_info *ei = (struct ext2_inode_info *) foo; |
| 166 | |
Christoph Lameter | a35afb8 | 2007-05-16 22:10:57 -0700 | [diff] [blame] | 167 | rwlock_init(&ei->i_meta_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 168 | #ifdef CONFIG_EXT2_FS_XATTR |
Christoph Lameter | a35afb8 | 2007-05-16 22:10:57 -0700 | [diff] [blame] | 169 | init_rwsem(&ei->xattr_sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 170 | #endif |
Martin J. Bligh | a686cd8 | 2007-10-16 23:30:46 -0700 | [diff] [blame] | 171 | mutex_init(&ei->truncate_mutex); |
Christoph Lameter | a35afb8 | 2007-05-16 22:10:57 -0700 | [diff] [blame] | 172 | inode_init_once(&ei->vfs_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | } |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 174 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 175 | static int init_inodecache(void) |
| 176 | { |
| 177 | ext2_inode_cachep = kmem_cache_create("ext2_inode_cache", |
| 178 | sizeof(struct ext2_inode_info), |
Paul Jackson | fffb60f | 2006-03-24 03:16:06 -0800 | [diff] [blame] | 179 | 0, (SLAB_RECLAIM_ACCOUNT| |
| 180 | SLAB_MEM_SPREAD), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 181 | init_once); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | if (ext2_inode_cachep == NULL) |
| 183 | return -ENOMEM; |
| 184 | return 0; |
| 185 | } |
| 186 | |
| 187 | static void destroy_inodecache(void) |
| 188 | { |
Alexey Dobriyan | 1a1d92c | 2006-09-27 01:49:40 -0700 | [diff] [blame] | 189 | kmem_cache_destroy(ext2_inode_cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 190 | } |
| 191 | |
| 192 | static void ext2_clear_inode(struct inode *inode) |
| 193 | { |
Martin J. Bligh | a686cd8 | 2007-10-16 23:30:46 -0700 | [diff] [blame] | 194 | struct ext2_block_alloc_info *rsv = EXT2_I(inode)->i_block_alloc_info; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 195 | #ifdef CONFIG_EXT2_FS_POSIX_ACL |
| 196 | struct ext2_inode_info *ei = EXT2_I(inode); |
| 197 | |
| 198 | if (ei->i_acl && ei->i_acl != EXT2_ACL_NOT_CACHED) { |
| 199 | posix_acl_release(ei->i_acl); |
| 200 | ei->i_acl = EXT2_ACL_NOT_CACHED; |
| 201 | } |
| 202 | if (ei->i_default_acl && ei->i_default_acl != EXT2_ACL_NOT_CACHED) { |
| 203 | posix_acl_release(ei->i_default_acl); |
| 204 | ei->i_default_acl = EXT2_ACL_NOT_CACHED; |
| 205 | } |
| 206 | #endif |
Martin J. Bligh | a686cd8 | 2007-10-16 23:30:46 -0700 | [diff] [blame] | 207 | ext2_discard_reservation(inode); |
| 208 | EXT2_I(inode)->i_block_alloc_info = NULL; |
| 209 | if (unlikely(rsv)) |
| 210 | kfree(rsv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 211 | } |
| 212 | |
Mark Bellon | 8fc2751 | 2005-09-06 15:16:54 -0700 | [diff] [blame] | 213 | static int ext2_show_options(struct seq_file *seq, struct vfsmount *vfs) |
| 214 | { |
Miklos Szeredi | 93d44cb | 2007-10-16 23:26:26 -0700 | [diff] [blame] | 215 | struct super_block *sb = vfs->mnt_sb; |
| 216 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
| 217 | struct ext2_super_block *es = sbi->s_es; |
| 218 | unsigned long def_mount_opts; |
Mark Bellon | 8fc2751 | 2005-09-06 15:16:54 -0700 | [diff] [blame] | 219 | |
Miklos Szeredi | 93d44cb | 2007-10-16 23:26:26 -0700 | [diff] [blame] | 220 | def_mount_opts = le32_to_cpu(es->s_default_mount_opts); |
| 221 | |
| 222 | if (sbi->s_sb_block != 1) |
| 223 | seq_printf(seq, ",sb=%lu", sbi->s_sb_block); |
| 224 | if (test_opt(sb, MINIX_DF)) |
| 225 | seq_puts(seq, ",minixdf"); |
| 226 | if (test_opt(sb, GRPID)) |
Mark Bellon | 8fc2751 | 2005-09-06 15:16:54 -0700 | [diff] [blame] | 227 | seq_puts(seq, ",grpid"); |
Miklos Szeredi | 93d44cb | 2007-10-16 23:26:26 -0700 | [diff] [blame] | 228 | if (!test_opt(sb, GRPID) && (def_mount_opts & EXT2_DEFM_BSDGROUPS)) |
| 229 | seq_puts(seq, ",nogrpid"); |
| 230 | if (sbi->s_resuid != EXT2_DEF_RESUID || |
| 231 | le16_to_cpu(es->s_def_resuid) != EXT2_DEF_RESUID) { |
| 232 | seq_printf(seq, ",resuid=%u", sbi->s_resuid); |
| 233 | } |
| 234 | if (sbi->s_resgid != EXT2_DEF_RESGID || |
| 235 | le16_to_cpu(es->s_def_resgid) != EXT2_DEF_RESGID) { |
| 236 | seq_printf(seq, ",resgid=%u", sbi->s_resgid); |
| 237 | } |
Aneesh Kumar K.V | 14e11e1 | 2008-02-06 01:36:17 -0800 | [diff] [blame] | 238 | if (test_opt(sb, ERRORS_RO)) { |
Miklos Szeredi | 93d44cb | 2007-10-16 23:26:26 -0700 | [diff] [blame] | 239 | int def_errors = le16_to_cpu(es->s_errors); |
| 240 | |
| 241 | if (def_errors == EXT2_ERRORS_PANIC || |
Aneesh Kumar K.V | 14e11e1 | 2008-02-06 01:36:17 -0800 | [diff] [blame] | 242 | def_errors == EXT2_ERRORS_CONTINUE) { |
| 243 | seq_puts(seq, ",errors=remount-ro"); |
Miklos Szeredi | 93d44cb | 2007-10-16 23:26:26 -0700 | [diff] [blame] | 244 | } |
| 245 | } |
Aneesh Kumar K.V | 14e11e1 | 2008-02-06 01:36:17 -0800 | [diff] [blame] | 246 | if (test_opt(sb, ERRORS_CONT)) |
| 247 | seq_puts(seq, ",errors=continue"); |
Miklos Szeredi | 93d44cb | 2007-10-16 23:26:26 -0700 | [diff] [blame] | 248 | if (test_opt(sb, ERRORS_PANIC)) |
| 249 | seq_puts(seq, ",errors=panic"); |
| 250 | if (test_opt(sb, NO_UID32)) |
| 251 | seq_puts(seq, ",nouid32"); |
| 252 | if (test_opt(sb, DEBUG)) |
| 253 | seq_puts(seq, ",debug"); |
| 254 | if (test_opt(sb, OLDALLOC)) |
| 255 | seq_puts(seq, ",oldalloc"); |
| 256 | |
| 257 | #ifdef CONFIG_EXT2_FS_XATTR |
| 258 | if (test_opt(sb, XATTR_USER)) |
| 259 | seq_puts(seq, ",user_xattr"); |
| 260 | if (!test_opt(sb, XATTR_USER) && |
| 261 | (def_mount_opts & EXT2_DEFM_XATTR_USER)) { |
| 262 | seq_puts(seq, ",nouser_xattr"); |
| 263 | } |
| 264 | #endif |
| 265 | |
| 266 | #ifdef CONFIG_EXT2_FS_POSIX_ACL |
| 267 | if (test_opt(sb, POSIX_ACL)) |
| 268 | seq_puts(seq, ",acl"); |
| 269 | if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT2_DEFM_ACL)) |
| 270 | seq_puts(seq, ",noacl"); |
| 271 | #endif |
| 272 | |
| 273 | if (test_opt(sb, NOBH)) |
| 274 | seq_puts(seq, ",nobh"); |
Mark Bellon | 8fc2751 | 2005-09-06 15:16:54 -0700 | [diff] [blame] | 275 | |
| 276 | #if defined(CONFIG_QUOTA) |
| 277 | if (sbi->s_mount_opt & EXT2_MOUNT_USRQUOTA) |
| 278 | seq_puts(seq, ",usrquota"); |
| 279 | |
| 280 | if (sbi->s_mount_opt & EXT2_MOUNT_GRPQUOTA) |
| 281 | seq_puts(seq, ",grpquota"); |
| 282 | #endif |
| 283 | |
Carsten Otte | 8354179 | 2006-02-03 03:04:25 -0800 | [diff] [blame] | 284 | #if defined(CONFIG_EXT2_FS_XIP) |
| 285 | if (sbi->s_mount_opt & EXT2_MOUNT_XIP) |
| 286 | seq_puts(seq, ",xip"); |
| 287 | #endif |
| 288 | |
Miklos Szeredi | 35c879d | 2008-02-08 04:21:42 -0800 | [diff] [blame] | 289 | if (!test_opt(sb, RESERVATION)) |
| 290 | seq_puts(seq, ",noreservation"); |
| 291 | |
Mark Bellon | 8fc2751 | 2005-09-06 15:16:54 -0700 | [diff] [blame] | 292 | return 0; |
| 293 | } |
| 294 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 295 | #ifdef CONFIG_QUOTA |
| 296 | static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off); |
| 297 | static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off); |
| 298 | #endif |
| 299 | |
Josef 'Jeff' Sipek | ee9b6d6 | 2007-02-12 00:55:41 -0800 | [diff] [blame] | 300 | static const struct super_operations ext2_sops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 301 | .alloc_inode = ext2_alloc_inode, |
| 302 | .destroy_inode = ext2_destroy_inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 303 | .write_inode = ext2_write_inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | .delete_inode = ext2_delete_inode, |
| 305 | .put_super = ext2_put_super, |
| 306 | .write_super = ext2_write_super, |
| 307 | .statfs = ext2_statfs, |
| 308 | .remount_fs = ext2_remount, |
| 309 | .clear_inode = ext2_clear_inode, |
Mark Bellon | 8fc2751 | 2005-09-06 15:16:54 -0700 | [diff] [blame] | 310 | .show_options = ext2_show_options, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 311 | #ifdef CONFIG_QUOTA |
| 312 | .quota_read = ext2_quota_read, |
| 313 | .quota_write = ext2_quota_write, |
| 314 | #endif |
| 315 | }; |
| 316 | |
Christoph Hellwig | 2e4c68e | 2007-10-21 16:42:07 -0700 | [diff] [blame] | 317 | static struct inode *ext2_nfs_get_inode(struct super_block *sb, |
| 318 | u64 ino, u32 generation) |
NeilBrown | ecaff75 | 2006-09-16 12:15:37 -0700 | [diff] [blame] | 319 | { |
NeilBrown | ecaff75 | 2006-09-16 12:15:37 -0700 | [diff] [blame] | 320 | struct inode *inode; |
NeilBrown | ecaff75 | 2006-09-16 12:15:37 -0700 | [diff] [blame] | 321 | |
| 322 | if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO) |
| 323 | return ERR_PTR(-ESTALE); |
| 324 | if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count)) |
| 325 | return ERR_PTR(-ESTALE); |
| 326 | |
| 327 | /* iget isn't really right if the inode is currently unallocated!! |
| 328 | * ext2_read_inode currently does appropriate checks, but |
| 329 | * it might be "neater" to call ext2_get_inode first and check |
| 330 | * if the inode is valid..... |
| 331 | */ |
David Howells | 52fcf70 | 2008-02-07 00:15:35 -0800 | [diff] [blame] | 332 | inode = ext2_iget(sb, ino); |
| 333 | if (IS_ERR(inode)) |
| 334 | return ERR_CAST(inode); |
| 335 | if (generation && inode->i_generation != generation) { |
NeilBrown | ecaff75 | 2006-09-16 12:15:37 -0700 | [diff] [blame] | 336 | /* we didn't find the right inode.. */ |
| 337 | iput(inode); |
| 338 | return ERR_PTR(-ESTALE); |
| 339 | } |
Christoph Hellwig | 2e4c68e | 2007-10-21 16:42:07 -0700 | [diff] [blame] | 340 | return inode; |
| 341 | } |
| 342 | |
| 343 | static struct dentry *ext2_fh_to_dentry(struct super_block *sb, struct fid *fid, |
| 344 | int fh_len, int fh_type) |
| 345 | { |
| 346 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, |
| 347 | ext2_nfs_get_inode); |
| 348 | } |
| 349 | |
| 350 | static struct dentry *ext2_fh_to_parent(struct super_block *sb, struct fid *fid, |
| 351 | int fh_len, int fh_type) |
| 352 | { |
| 353 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, |
| 354 | ext2_nfs_get_inode); |
NeilBrown | ecaff75 | 2006-09-16 12:15:37 -0700 | [diff] [blame] | 355 | } |
| 356 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 357 | /* Yes, most of these are left as NULL!! |
| 358 | * A NULL value implies the default, which works with ext2-like file |
| 359 | * systems, but can be improved upon. |
| 360 | * Currently only get_parent is required. |
| 361 | */ |
Christoph Hellwig | 3965516 | 2007-10-21 16:42:17 -0700 | [diff] [blame] | 362 | static const struct export_operations ext2_export_ops = { |
Christoph Hellwig | 2e4c68e | 2007-10-21 16:42:07 -0700 | [diff] [blame] | 363 | .fh_to_dentry = ext2_fh_to_dentry, |
| 364 | .fh_to_parent = ext2_fh_to_parent, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 365 | .get_parent = ext2_get_parent, |
| 366 | }; |
| 367 | |
| 368 | static unsigned long get_sb_block(void **data) |
| 369 | { |
| 370 | unsigned long sb_block; |
| 371 | char *options = (char *) *data; |
| 372 | |
| 373 | if (!options || strncmp(options, "sb=", 3) != 0) |
| 374 | return 1; /* Default location */ |
| 375 | options += 3; |
| 376 | sb_block = simple_strtoul(options, &options, 0); |
| 377 | if (*options && *options != ',') { |
| 378 | printk("EXT2-fs: Invalid sb specification: %s\n", |
| 379 | (char *) *data); |
| 380 | return 1; |
| 381 | } |
| 382 | if (*options == ',') |
| 383 | options++; |
| 384 | *data = (void *) options; |
| 385 | return sb_block; |
| 386 | } |
| 387 | |
| 388 | enum { |
| 389 | Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, |
Mark Bellon | 8fc2751 | 2005-09-06 15:16:54 -0700 | [diff] [blame] | 390 | Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, |
Adrian Bunk | 2860b73 | 2005-11-08 21:34:59 -0800 | [diff] [blame] | 391 | Opt_err_ro, Opt_nouid32, Opt_nocheck, Opt_debug, |
Mark Bellon | 8fc2751 | 2005-09-06 15:16:54 -0700 | [diff] [blame] | 392 | Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr, |
| 393 | Opt_acl, Opt_noacl, Opt_xip, Opt_ignore, Opt_err, Opt_quota, |
Martin J. Bligh | a686cd8 | 2007-10-16 23:30:46 -0700 | [diff] [blame] | 394 | Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 395 | }; |
| 396 | |
Steven Whitehouse | a447c09 | 2008-10-13 10:46:57 +0100 | [diff] [blame] | 397 | static const match_table_t tokens = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 398 | {Opt_bsd_df, "bsddf"}, |
| 399 | {Opt_minix_df, "minixdf"}, |
| 400 | {Opt_grpid, "grpid"}, |
| 401 | {Opt_grpid, "bsdgroups"}, |
| 402 | {Opt_nogrpid, "nogrpid"}, |
| 403 | {Opt_nogrpid, "sysvgroups"}, |
| 404 | {Opt_resgid, "resgid=%u"}, |
| 405 | {Opt_resuid, "resuid=%u"}, |
| 406 | {Opt_sb, "sb=%u"}, |
| 407 | {Opt_err_cont, "errors=continue"}, |
| 408 | {Opt_err_panic, "errors=panic"}, |
| 409 | {Opt_err_ro, "errors=remount-ro"}, |
| 410 | {Opt_nouid32, "nouid32"}, |
| 411 | {Opt_nocheck, "check=none"}, |
| 412 | {Opt_nocheck, "nocheck"}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 413 | {Opt_debug, "debug"}, |
| 414 | {Opt_oldalloc, "oldalloc"}, |
| 415 | {Opt_orlov, "orlov"}, |
| 416 | {Opt_nobh, "nobh"}, |
| 417 | {Opt_user_xattr, "user_xattr"}, |
| 418 | {Opt_nouser_xattr, "nouser_xattr"}, |
| 419 | {Opt_acl, "acl"}, |
| 420 | {Opt_noacl, "noacl"}, |
Carsten Otte | 6d79125 | 2005-06-23 22:05:26 -0700 | [diff] [blame] | 421 | {Opt_xip, "xip"}, |
Mark Bellon | 8fc2751 | 2005-09-06 15:16:54 -0700 | [diff] [blame] | 422 | {Opt_grpquota, "grpquota"}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 423 | {Opt_ignore, "noquota"}, |
Mark Bellon | 8fc2751 | 2005-09-06 15:16:54 -0700 | [diff] [blame] | 424 | {Opt_quota, "quota"}, |
| 425 | {Opt_usrquota, "usrquota"}, |
Martin J. Bligh | a686cd8 | 2007-10-16 23:30:46 -0700 | [diff] [blame] | 426 | {Opt_reservation, "reservation"}, |
| 427 | {Opt_noreservation, "noreservation"}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 428 | {Opt_err, NULL} |
| 429 | }; |
| 430 | |
| 431 | static int parse_options (char * options, |
| 432 | struct ext2_sb_info *sbi) |
| 433 | { |
| 434 | char * p; |
| 435 | substring_t args[MAX_OPT_ARGS]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 436 | int option; |
| 437 | |
| 438 | if (!options) |
| 439 | return 1; |
| 440 | |
| 441 | while ((p = strsep (&options, ",")) != NULL) { |
| 442 | int token; |
| 443 | if (!*p) |
| 444 | continue; |
| 445 | |
| 446 | token = match_token(p, tokens, args); |
| 447 | switch (token) { |
| 448 | case Opt_bsd_df: |
| 449 | clear_opt (sbi->s_mount_opt, MINIX_DF); |
| 450 | break; |
| 451 | case Opt_minix_df: |
| 452 | set_opt (sbi->s_mount_opt, MINIX_DF); |
| 453 | break; |
| 454 | case Opt_grpid: |
| 455 | set_opt (sbi->s_mount_opt, GRPID); |
| 456 | break; |
| 457 | case Opt_nogrpid: |
| 458 | clear_opt (sbi->s_mount_opt, GRPID); |
| 459 | break; |
| 460 | case Opt_resuid: |
| 461 | if (match_int(&args[0], &option)) |
| 462 | return 0; |
| 463 | sbi->s_resuid = option; |
| 464 | break; |
| 465 | case Opt_resgid: |
| 466 | if (match_int(&args[0], &option)) |
| 467 | return 0; |
| 468 | sbi->s_resgid = option; |
| 469 | break; |
| 470 | case Opt_sb: |
| 471 | /* handled by get_sb_block() instead of here */ |
| 472 | /* *sb_block = match_int(&args[0]); */ |
| 473 | break; |
| 474 | case Opt_err_panic: |
Vasily Averin | 5a2b406 | 2006-10-11 01:21:50 -0700 | [diff] [blame] | 475 | clear_opt (sbi->s_mount_opt, ERRORS_CONT); |
| 476 | clear_opt (sbi->s_mount_opt, ERRORS_RO); |
| 477 | set_opt (sbi->s_mount_opt, ERRORS_PANIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 478 | break; |
| 479 | case Opt_err_ro: |
Vasily Averin | 5a2b406 | 2006-10-11 01:21:50 -0700 | [diff] [blame] | 480 | clear_opt (sbi->s_mount_opt, ERRORS_CONT); |
| 481 | clear_opt (sbi->s_mount_opt, ERRORS_PANIC); |
| 482 | set_opt (sbi->s_mount_opt, ERRORS_RO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 483 | break; |
| 484 | case Opt_err_cont: |
Vasily Averin | 5a2b406 | 2006-10-11 01:21:50 -0700 | [diff] [blame] | 485 | clear_opt (sbi->s_mount_opt, ERRORS_RO); |
| 486 | clear_opt (sbi->s_mount_opt, ERRORS_PANIC); |
| 487 | set_opt (sbi->s_mount_opt, ERRORS_CONT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 488 | break; |
| 489 | case Opt_nouid32: |
| 490 | set_opt (sbi->s_mount_opt, NO_UID32); |
| 491 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 492 | case Opt_nocheck: |
| 493 | clear_opt (sbi->s_mount_opt, CHECK); |
| 494 | break; |
| 495 | case Opt_debug: |
| 496 | set_opt (sbi->s_mount_opt, DEBUG); |
| 497 | break; |
| 498 | case Opt_oldalloc: |
| 499 | set_opt (sbi->s_mount_opt, OLDALLOC); |
| 500 | break; |
| 501 | case Opt_orlov: |
| 502 | clear_opt (sbi->s_mount_opt, OLDALLOC); |
| 503 | break; |
| 504 | case Opt_nobh: |
| 505 | set_opt (sbi->s_mount_opt, NOBH); |
| 506 | break; |
| 507 | #ifdef CONFIG_EXT2_FS_XATTR |
| 508 | case Opt_user_xattr: |
| 509 | set_opt (sbi->s_mount_opt, XATTR_USER); |
| 510 | break; |
| 511 | case Opt_nouser_xattr: |
| 512 | clear_opt (sbi->s_mount_opt, XATTR_USER); |
| 513 | break; |
| 514 | #else |
| 515 | case Opt_user_xattr: |
| 516 | case Opt_nouser_xattr: |
| 517 | printk("EXT2 (no)user_xattr options not supported\n"); |
| 518 | break; |
| 519 | #endif |
| 520 | #ifdef CONFIG_EXT2_FS_POSIX_ACL |
| 521 | case Opt_acl: |
| 522 | set_opt(sbi->s_mount_opt, POSIX_ACL); |
| 523 | break; |
| 524 | case Opt_noacl: |
| 525 | clear_opt(sbi->s_mount_opt, POSIX_ACL); |
| 526 | break; |
| 527 | #else |
| 528 | case Opt_acl: |
| 529 | case Opt_noacl: |
| 530 | printk("EXT2 (no)acl options not supported\n"); |
| 531 | break; |
| 532 | #endif |
Carsten Otte | 6d79125 | 2005-06-23 22:05:26 -0700 | [diff] [blame] | 533 | case Opt_xip: |
| 534 | #ifdef CONFIG_EXT2_FS_XIP |
| 535 | set_opt (sbi->s_mount_opt, XIP); |
| 536 | #else |
| 537 | printk("EXT2 xip option not supported\n"); |
| 538 | #endif |
| 539 | break; |
Mark Bellon | 8fc2751 | 2005-09-06 15:16:54 -0700 | [diff] [blame] | 540 | |
| 541 | #if defined(CONFIG_QUOTA) |
| 542 | case Opt_quota: |
| 543 | case Opt_usrquota: |
| 544 | set_opt(sbi->s_mount_opt, USRQUOTA); |
| 545 | break; |
| 546 | |
| 547 | case Opt_grpquota: |
| 548 | set_opt(sbi->s_mount_opt, GRPQUOTA); |
| 549 | break; |
| 550 | #else |
| 551 | case Opt_quota: |
| 552 | case Opt_usrquota: |
| 553 | case Opt_grpquota: |
| 554 | printk(KERN_ERR |
| 555 | "EXT2-fs: quota operations not supported.\n"); |
| 556 | |
| 557 | break; |
| 558 | #endif |
| 559 | |
Martin J. Bligh | a686cd8 | 2007-10-16 23:30:46 -0700 | [diff] [blame] | 560 | case Opt_reservation: |
| 561 | set_opt(sbi->s_mount_opt, RESERVATION); |
| 562 | printk("reservations ON\n"); |
| 563 | break; |
| 564 | case Opt_noreservation: |
| 565 | clear_opt(sbi->s_mount_opt, RESERVATION); |
| 566 | printk("reservations OFF\n"); |
| 567 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 568 | case Opt_ignore: |
| 569 | break; |
| 570 | default: |
| 571 | return 0; |
| 572 | } |
| 573 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 574 | return 1; |
| 575 | } |
| 576 | |
| 577 | static int ext2_setup_super (struct super_block * sb, |
| 578 | struct ext2_super_block * es, |
| 579 | int read_only) |
| 580 | { |
| 581 | int res = 0; |
| 582 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
| 583 | |
| 584 | if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) { |
| 585 | printk ("EXT2-fs warning: revision level too high, " |
| 586 | "forcing read-only mode\n"); |
| 587 | res = MS_RDONLY; |
| 588 | } |
| 589 | if (read_only) |
| 590 | return res; |
| 591 | if (!(sbi->s_mount_state & EXT2_VALID_FS)) |
| 592 | printk ("EXT2-fs warning: mounting unchecked fs, " |
| 593 | "running e2fsck is recommended\n"); |
| 594 | else if ((sbi->s_mount_state & EXT2_ERROR_FS)) |
| 595 | printk ("EXT2-fs warning: mounting fs with errors, " |
| 596 | "running e2fsck is recommended\n"); |
| 597 | else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && |
| 598 | le16_to_cpu(es->s_mnt_count) >= |
| 599 | (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) |
| 600 | printk ("EXT2-fs warning: maximal mount count reached, " |
| 601 | "running e2fsck is recommended\n"); |
| 602 | else if (le32_to_cpu(es->s_checkinterval) && |
| 603 | (le32_to_cpu(es->s_lastcheck) + le32_to_cpu(es->s_checkinterval) <= get_seconds())) |
| 604 | printk ("EXT2-fs warning: checktime reached, " |
| 605 | "running e2fsck is recommended\n"); |
| 606 | if (!le16_to_cpu(es->s_max_mnt_count)) |
| 607 | es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT); |
Marcin Slusarz | fba4d39 | 2008-04-28 02:15:59 -0700 | [diff] [blame] | 608 | le16_add_cpu(&es->s_mnt_count, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | ext2_write_super(sb); |
| 610 | if (test_opt (sb, DEBUG)) |
| 611 | printk ("[EXT II FS %s, %s, bs=%lu, fs=%lu, gc=%lu, " |
| 612 | "bpg=%lu, ipg=%lu, mo=%04lx]\n", |
| 613 | EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize, |
| 614 | sbi->s_frag_size, |
| 615 | sbi->s_groups_count, |
| 616 | EXT2_BLOCKS_PER_GROUP(sb), |
| 617 | EXT2_INODES_PER_GROUP(sb), |
| 618 | sbi->s_mount_opt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 619 | return res; |
| 620 | } |
| 621 | |
Akinobu Mita | 197cd65a | 2008-02-06 01:40:16 -0800 | [diff] [blame] | 622 | static int ext2_check_descriptors(struct super_block *sb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 623 | { |
| 624 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 625 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 626 | |
| 627 | ext2_debug ("Checking group descriptors"); |
| 628 | |
Akinobu Mita | 197cd65a | 2008-02-06 01:40:16 -0800 | [diff] [blame] | 629 | for (i = 0; i < sbi->s_groups_count; i++) { |
| 630 | struct ext2_group_desc *gdp = ext2_get_group_desc(sb, i, NULL); |
Akinobu Mita | 24097d1 | 2008-04-28 02:16:01 -0700 | [diff] [blame] | 631 | ext2_fsblk_t first_block = ext2_group_first_block_no(sb, i); |
| 632 | ext2_fsblk_t last_block; |
Akinobu Mita | 197cd65a | 2008-02-06 01:40:16 -0800 | [diff] [blame] | 633 | |
Eric Sandeen | 41f04d8 | 2006-09-27 01:49:30 -0700 | [diff] [blame] | 634 | if (i == sbi->s_groups_count - 1) |
| 635 | last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1; |
| 636 | else |
| 637 | last_block = first_block + |
| 638 | (EXT2_BLOCKS_PER_GROUP(sb) - 1); |
| 639 | |
Eric Sandeen | 41f04d8 | 2006-09-27 01:49:30 -0700 | [diff] [blame] | 640 | if (le32_to_cpu(gdp->bg_block_bitmap) < first_block || |
| 641 | le32_to_cpu(gdp->bg_block_bitmap) > last_block) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 642 | { |
| 643 | ext2_error (sb, "ext2_check_descriptors", |
| 644 | "Block bitmap for group %d" |
| 645 | " not in group (block %lu)!", |
| 646 | i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap)); |
| 647 | return 0; |
| 648 | } |
Eric Sandeen | 41f04d8 | 2006-09-27 01:49:30 -0700 | [diff] [blame] | 649 | if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block || |
| 650 | le32_to_cpu(gdp->bg_inode_bitmap) > last_block) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 651 | { |
| 652 | ext2_error (sb, "ext2_check_descriptors", |
| 653 | "Inode bitmap for group %d" |
| 654 | " not in group (block %lu)!", |
| 655 | i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap)); |
| 656 | return 0; |
| 657 | } |
Eric Sandeen | 41f04d8 | 2006-09-27 01:49:30 -0700 | [diff] [blame] | 658 | if (le32_to_cpu(gdp->bg_inode_table) < first_block || |
Eric Sandeen | 780dcdb | 2007-07-26 10:41:11 -0700 | [diff] [blame] | 659 | le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 > |
Eric Sandeen | 41f04d8 | 2006-09-27 01:49:30 -0700 | [diff] [blame] | 660 | last_block) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 661 | { |
| 662 | ext2_error (sb, "ext2_check_descriptors", |
| 663 | "Inode table for group %d" |
| 664 | " not in group (block %lu)!", |
| 665 | i, (unsigned long) le32_to_cpu(gdp->bg_inode_table)); |
| 666 | return 0; |
| 667 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 668 | } |
| 669 | return 1; |
| 670 | } |
| 671 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 672 | /* |
| 673 | * Maximal file size. There is a direct, and {,double-,triple-}indirect |
| 674 | * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. |
| 675 | * We need to be 1 filesystem block less than the 2^32 sector limit. |
| 676 | */ |
| 677 | static loff_t ext2_max_size(int bits) |
| 678 | { |
| 679 | loff_t res = EXT2_NDIR_BLOCKS; |
Aneesh Kumar K.V | 902be4c | 2008-01-28 23:58:26 -0500 | [diff] [blame] | 680 | int meta_blocks; |
| 681 | loff_t upper_limit; |
| 682 | |
| 683 | /* This is calculated to be the largest file size for a |
| 684 | * dense, file such that the total number of |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 685 | * sectors in the file, including data and all indirect blocks, |
Aneesh Kumar K.V | 902be4c | 2008-01-28 23:58:26 -0500 | [diff] [blame] | 686 | * does not exceed 2^32 -1 |
| 687 | * __u32 i_blocks representing the total number of |
| 688 | * 512 bytes blocks of the file |
| 689 | */ |
| 690 | upper_limit = (1LL << 32) - 1; |
| 691 | |
| 692 | /* total blocks in file system block size */ |
| 693 | upper_limit >>= (bits - 9); |
| 694 | |
| 695 | |
| 696 | /* indirect blocks */ |
| 697 | meta_blocks = 1; |
| 698 | /* double indirect blocks */ |
| 699 | meta_blocks += 1 + (1LL << (bits-2)); |
| 700 | /* tripple indirect blocks */ |
| 701 | meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2))); |
| 702 | |
| 703 | upper_limit -= meta_blocks; |
| 704 | upper_limit <<= bits; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 705 | |
| 706 | res += 1LL << (bits-2); |
| 707 | res += 1LL << (2*(bits-2)); |
| 708 | res += 1LL << (3*(bits-2)); |
| 709 | res <<= bits; |
| 710 | if (res > upper_limit) |
| 711 | res = upper_limit; |
Aneesh Kumar K.V | 902be4c | 2008-01-28 23:58:26 -0500 | [diff] [blame] | 712 | |
| 713 | if (res > MAX_LFS_FILESIZE) |
| 714 | res = MAX_LFS_FILESIZE; |
| 715 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 716 | return res; |
| 717 | } |
| 718 | |
| 719 | static unsigned long descriptor_loc(struct super_block *sb, |
| 720 | unsigned long logic_sb_block, |
| 721 | int nr) |
| 722 | { |
| 723 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
Akinobu Mita | 24097d1 | 2008-04-28 02:16:01 -0700 | [diff] [blame] | 724 | unsigned long bg, first_meta_bg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 725 | int has_super = 0; |
| 726 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 727 | first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); |
| 728 | |
| 729 | if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) || |
| 730 | nr < first_meta_bg) |
| 731 | return (logic_sb_block + nr + 1); |
| 732 | bg = sbi->s_desc_per_block * nr; |
| 733 | if (ext2_bg_has_super(sb, bg)) |
| 734 | has_super = 1; |
Akinobu Mita | 24097d1 | 2008-04-28 02:16:01 -0700 | [diff] [blame] | 735 | |
| 736 | return ext2_group_first_block_no(sb, bg) + has_super; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 737 | } |
| 738 | |
| 739 | static int ext2_fill_super(struct super_block *sb, void *data, int silent) |
| 740 | { |
| 741 | struct buffer_head * bh; |
| 742 | struct ext2_sb_info * sbi; |
| 743 | struct ext2_super_block * es; |
| 744 | struct inode *root; |
| 745 | unsigned long block; |
| 746 | unsigned long sb_block = get_sb_block(&data); |
| 747 | unsigned long logic_sb_block; |
| 748 | unsigned long offset = 0; |
| 749 | unsigned long def_mount_opts; |
David Howells | 52fcf70 | 2008-02-07 00:15:35 -0800 | [diff] [blame] | 750 | long ret = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 751 | int blocksize = BLOCK_SIZE; |
| 752 | int db_count; |
| 753 | int i, j; |
| 754 | __le32 features; |
Peter Zijlstra | 833f407 | 2007-10-16 23:25:45 -0700 | [diff] [blame] | 755 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 756 | |
Panagiotis Issaris | f8314dc | 2006-09-27 01:49:37 -0700 | [diff] [blame] | 757 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 758 | if (!sbi) |
| 759 | return -ENOMEM; |
Pekka J Enberg | 18a82eb | 2009-01-07 18:07:19 -0800 | [diff] [blame] | 760 | |
| 761 | sbi->s_blockgroup_lock = |
| 762 | kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); |
| 763 | if (!sbi->s_blockgroup_lock) { |
| 764 | kfree(sbi); |
| 765 | return -ENOMEM; |
| 766 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 767 | sb->s_fs_info = sbi; |
Miklos Szeredi | 93d44cb | 2007-10-16 23:26:26 -0700 | [diff] [blame] | 768 | sbi->s_sb_block = sb_block; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 769 | |
| 770 | /* |
| 771 | * See what the current blocksize for the device is, and |
| 772 | * use that as the blocksize. Otherwise (or if the blocksize |
| 773 | * is smaller than the default) use the default. |
| 774 | * This is important for devices that have a hardware |
| 775 | * sectorsize that is larger than the default. |
| 776 | */ |
| 777 | blocksize = sb_min_blocksize(sb, BLOCK_SIZE); |
| 778 | if (!blocksize) { |
| 779 | printk ("EXT2-fs: unable to set blocksize\n"); |
| 780 | goto failed_sbi; |
| 781 | } |
| 782 | |
| 783 | /* |
| 784 | * If the superblock doesn't start on a hardware sector boundary, |
| 785 | * calculate the offset. |
| 786 | */ |
| 787 | if (blocksize != BLOCK_SIZE) { |
| 788 | logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; |
| 789 | offset = (sb_block*BLOCK_SIZE) % blocksize; |
| 790 | } else { |
| 791 | logic_sb_block = sb_block; |
| 792 | } |
| 793 | |
| 794 | if (!(bh = sb_bread(sb, logic_sb_block))) { |
| 795 | printk ("EXT2-fs: unable to read superblock\n"); |
| 796 | goto failed_sbi; |
| 797 | } |
| 798 | /* |
| 799 | * Note: s_es must be initialized as soon as possible because |
| 800 | * some ext2 macro-instructions depend on its value |
| 801 | */ |
| 802 | es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); |
| 803 | sbi->s_es = es; |
| 804 | sb->s_magic = le16_to_cpu(es->s_magic); |
| 805 | |
| 806 | if (sb->s_magic != EXT2_SUPER_MAGIC) |
| 807 | goto cantfind_ext2; |
| 808 | |
| 809 | /* Set defaults before we parse the mount options */ |
| 810 | def_mount_opts = le32_to_cpu(es->s_default_mount_opts); |
| 811 | if (def_mount_opts & EXT2_DEFM_DEBUG) |
| 812 | set_opt(sbi->s_mount_opt, DEBUG); |
| 813 | if (def_mount_opts & EXT2_DEFM_BSDGROUPS) |
| 814 | set_opt(sbi->s_mount_opt, GRPID); |
| 815 | if (def_mount_opts & EXT2_DEFM_UID16) |
| 816 | set_opt(sbi->s_mount_opt, NO_UID32); |
Hugh Dickins | 2e7842b | 2007-02-10 01:46:13 -0800 | [diff] [blame] | 817 | #ifdef CONFIG_EXT2_FS_XATTR |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 818 | if (def_mount_opts & EXT2_DEFM_XATTR_USER) |
| 819 | set_opt(sbi->s_mount_opt, XATTR_USER); |
Hugh Dickins | 2e7842b | 2007-02-10 01:46:13 -0800 | [diff] [blame] | 820 | #endif |
| 821 | #ifdef CONFIG_EXT2_FS_POSIX_ACL |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 822 | if (def_mount_opts & EXT2_DEFM_ACL) |
| 823 | set_opt(sbi->s_mount_opt, POSIX_ACL); |
Hugh Dickins | 2e7842b | 2007-02-10 01:46:13 -0800 | [diff] [blame] | 824 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 825 | |
| 826 | if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC) |
| 827 | set_opt(sbi->s_mount_opt, ERRORS_PANIC); |
Aneesh Kumar K.V | 14e11e1 | 2008-02-06 01:36:17 -0800 | [diff] [blame] | 828 | else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE) |
Vasily Averin | 5a2b406 | 2006-10-11 01:21:50 -0700 | [diff] [blame] | 829 | set_opt(sbi->s_mount_opt, ERRORS_CONT); |
Aneesh Kumar K.V | 14e11e1 | 2008-02-06 01:36:17 -0800 | [diff] [blame] | 830 | else |
| 831 | set_opt(sbi->s_mount_opt, ERRORS_RO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | |
| 833 | sbi->s_resuid = le16_to_cpu(es->s_def_resuid); |
| 834 | sbi->s_resgid = le16_to_cpu(es->s_def_resgid); |
| 835 | |
Martin J. Bligh | a686cd8 | 2007-10-16 23:30:46 -0700 | [diff] [blame] | 836 | set_opt(sbi->s_mount_opt, RESERVATION); |
| 837 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 838 | if (!parse_options ((char *) data, sbi)) |
| 839 | goto failed_mount; |
| 840 | |
| 841 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | |
| 842 | ((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? |
| 843 | MS_POSIXACL : 0); |
| 844 | |
Carsten Otte | 6d79125 | 2005-06-23 22:05:26 -0700 | [diff] [blame] | 845 | ext2_xip_verify_sb(sb); /* see if bdev supports xip, unset |
| 846 | EXT2_MOUNT_XIP if not */ |
| 847 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 848 | if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV && |
| 849 | (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) || |
| 850 | EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) || |
| 851 | EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U))) |
| 852 | printk("EXT2-fs warning: feature flags set on rev 0 fs, " |
| 853 | "running e2fsck is recommended\n"); |
| 854 | /* |
| 855 | * Check feature flags regardless of the revision level, since we |
| 856 | * previously didn't change the revision level when setting the flags, |
| 857 | * so there is a chance incompat flags are set on a rev 0 filesystem. |
| 858 | */ |
| 859 | features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP); |
| 860 | if (features) { |
| 861 | printk("EXT2-fs: %s: couldn't mount because of " |
| 862 | "unsupported optional features (%x).\n", |
| 863 | sb->s_id, le32_to_cpu(features)); |
| 864 | goto failed_mount; |
| 865 | } |
| 866 | if (!(sb->s_flags & MS_RDONLY) && |
| 867 | (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){ |
| 868 | printk("EXT2-fs: %s: couldn't mount RDWR because of " |
| 869 | "unsupported optional features (%x).\n", |
| 870 | sb->s_id, le32_to_cpu(features)); |
| 871 | goto failed_mount; |
| 872 | } |
| 873 | |
| 874 | blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size); |
| 875 | |
Nick Piggin | a8e3eff | 2008-02-06 01:37:42 -0800 | [diff] [blame] | 876 | if (ext2_use_xip(sb) && blocksize != PAGE_SIZE) { |
Carsten Otte | 6d79125 | 2005-06-23 22:05:26 -0700 | [diff] [blame] | 877 | if (!silent) |
| 878 | printk("XIP: Unsupported blocksize\n"); |
| 879 | goto failed_mount; |
| 880 | } |
| 881 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | /* If the blocksize doesn't match, re-read the thing.. */ |
| 883 | if (sb->s_blocksize != blocksize) { |
| 884 | brelse(bh); |
| 885 | |
| 886 | if (!sb_set_blocksize(sb, blocksize)) { |
| 887 | printk(KERN_ERR "EXT2-fs: blocksize too small for device.\n"); |
| 888 | goto failed_sbi; |
| 889 | } |
| 890 | |
| 891 | logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; |
| 892 | offset = (sb_block*BLOCK_SIZE) % blocksize; |
| 893 | bh = sb_bread(sb, logic_sb_block); |
| 894 | if(!bh) { |
| 895 | printk("EXT2-fs: Couldn't read superblock on " |
| 896 | "2nd try.\n"); |
| 897 | goto failed_sbi; |
| 898 | } |
| 899 | es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); |
| 900 | sbi->s_es = es; |
| 901 | if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) { |
| 902 | printk ("EXT2-fs: Magic mismatch, very weird !\n"); |
| 903 | goto failed_mount; |
| 904 | } |
| 905 | } |
| 906 | |
| 907 | sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits); |
| 908 | |
| 909 | if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) { |
| 910 | sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE; |
| 911 | sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO; |
| 912 | } else { |
| 913 | sbi->s_inode_size = le16_to_cpu(es->s_inode_size); |
| 914 | sbi->s_first_ino = le32_to_cpu(es->s_first_ino); |
| 915 | if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) || |
vignesh babu | d8ea6cf | 2007-10-16 23:27:14 -0700 | [diff] [blame] | 916 | !is_power_of_2(sbi->s_inode_size) || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 917 | (sbi->s_inode_size > blocksize)) { |
| 918 | printk ("EXT2-fs: unsupported inode size: %d\n", |
| 919 | sbi->s_inode_size); |
| 920 | goto failed_mount; |
| 921 | } |
| 922 | } |
| 923 | |
| 924 | sbi->s_frag_size = EXT2_MIN_FRAG_SIZE << |
| 925 | le32_to_cpu(es->s_log_frag_size); |
| 926 | if (sbi->s_frag_size == 0) |
| 927 | goto cantfind_ext2; |
| 928 | sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size; |
| 929 | |
| 930 | sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); |
| 931 | sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); |
| 932 | sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); |
| 933 | |
| 934 | if (EXT2_INODE_SIZE(sb) == 0) |
| 935 | goto cantfind_ext2; |
| 936 | sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb); |
Andries Brouwer | 607eb26 | 2006-08-27 01:23:43 -0700 | [diff] [blame] | 937 | if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 938 | goto cantfind_ext2; |
| 939 | sbi->s_itb_per_group = sbi->s_inodes_per_group / |
| 940 | sbi->s_inodes_per_block; |
| 941 | sbi->s_desc_per_block = sb->s_blocksize / |
| 942 | sizeof (struct ext2_group_desc); |
| 943 | sbi->s_sbh = bh; |
| 944 | sbi->s_mount_state = le16_to_cpu(es->s_state); |
| 945 | sbi->s_addr_per_block_bits = |
David Howells | f0d1b0b | 2006-12-08 02:37:49 -0800 | [diff] [blame] | 946 | ilog2 (EXT2_ADDR_PER_BLOCK(sb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 947 | sbi->s_desc_per_block_bits = |
David Howells | f0d1b0b | 2006-12-08 02:37:49 -0800 | [diff] [blame] | 948 | ilog2 (EXT2_DESC_PER_BLOCK(sb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 949 | |
| 950 | if (sb->s_magic != EXT2_SUPER_MAGIC) |
| 951 | goto cantfind_ext2; |
| 952 | |
| 953 | if (sb->s_blocksize != bh->b_size) { |
| 954 | if (!silent) |
| 955 | printk ("VFS: Unsupported blocksize on dev " |
| 956 | "%s.\n", sb->s_id); |
| 957 | goto failed_mount; |
| 958 | } |
| 959 | |
| 960 | if (sb->s_blocksize != sbi->s_frag_size) { |
| 961 | printk ("EXT2-fs: fragsize %lu != blocksize %lu (not supported yet)\n", |
| 962 | sbi->s_frag_size, sb->s_blocksize); |
| 963 | goto failed_mount; |
| 964 | } |
| 965 | |
| 966 | if (sbi->s_blocks_per_group > sb->s_blocksize * 8) { |
| 967 | printk ("EXT2-fs: #blocks per group too big: %lu\n", |
| 968 | sbi->s_blocks_per_group); |
| 969 | goto failed_mount; |
| 970 | } |
| 971 | if (sbi->s_frags_per_group > sb->s_blocksize * 8) { |
| 972 | printk ("EXT2-fs: #fragments per group too big: %lu\n", |
| 973 | sbi->s_frags_per_group); |
| 974 | goto failed_mount; |
| 975 | } |
| 976 | if (sbi->s_inodes_per_group > sb->s_blocksize * 8) { |
| 977 | printk ("EXT2-fs: #inodes per group too big: %lu\n", |
| 978 | sbi->s_inodes_per_group); |
| 979 | goto failed_mount; |
| 980 | } |
| 981 | |
| 982 | if (EXT2_BLOCKS_PER_GROUP(sb) == 0) |
| 983 | goto cantfind_ext2; |
Eric Sandeen | 41f04d8 | 2006-09-27 01:49:30 -0700 | [diff] [blame] | 984 | sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) - |
| 985 | le32_to_cpu(es->s_first_data_block) - 1) |
| 986 | / EXT2_BLOCKS_PER_GROUP(sb)) + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 987 | db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) / |
| 988 | EXT2_DESC_PER_BLOCK(sb); |
| 989 | sbi->s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL); |
| 990 | if (sbi->s_group_desc == NULL) { |
| 991 | printk ("EXT2-fs: not enough memory\n"); |
| 992 | goto failed_mount; |
| 993 | } |
Pekka J Enberg | 18a82eb | 2009-01-07 18:07:19 -0800 | [diff] [blame] | 994 | bgl_lock_init(sbi->s_blockgroup_lock); |
Yoann Padioleau | dd00cc4 | 2007-07-19 01:49:03 -0700 | [diff] [blame] | 995 | sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 996 | if (!sbi->s_debts) { |
| 997 | printk ("EXT2-fs: not enough memory\n"); |
| 998 | goto failed_mount_group_desc; |
| 999 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1000 | for (i = 0; i < db_count; i++) { |
| 1001 | block = descriptor_loc(sb, logic_sb_block, i); |
| 1002 | sbi->s_group_desc[i] = sb_bread(sb, block); |
| 1003 | if (!sbi->s_group_desc[i]) { |
| 1004 | for (j = 0; j < i; j++) |
| 1005 | brelse (sbi->s_group_desc[j]); |
| 1006 | printk ("EXT2-fs: unable to read group descriptors\n"); |
| 1007 | goto failed_mount_group_desc; |
| 1008 | } |
| 1009 | } |
| 1010 | if (!ext2_check_descriptors (sb)) { |
| 1011 | printk ("EXT2-fs: group descriptors corrupted!\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1012 | goto failed_mount2; |
| 1013 | } |
| 1014 | sbi->s_gdb_count = db_count; |
| 1015 | get_random_bytes(&sbi->s_next_generation, sizeof(u32)); |
| 1016 | spin_lock_init(&sbi->s_next_gen_lock); |
Mingming Cao | 0216bfc | 2006-06-23 02:05:41 -0700 | [diff] [blame] | 1017 | |
Martin J. Bligh | a686cd8 | 2007-10-16 23:30:46 -0700 | [diff] [blame] | 1018 | /* per fileystem reservation list head & lock */ |
| 1019 | spin_lock_init(&sbi->s_rsv_window_lock); |
| 1020 | sbi->s_rsv_window_root = RB_ROOT; |
| 1021 | /* |
| 1022 | * Add a single, static dummy reservation to the start of the |
| 1023 | * reservation window list --- it gives us a placeholder for |
| 1024 | * append-at-start-of-list which makes the allocation logic |
| 1025 | * _much_ simpler. |
| 1026 | */ |
| 1027 | sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; |
| 1028 | sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; |
| 1029 | sbi->s_rsv_window_head.rsv_alloc_hit = 0; |
| 1030 | sbi->s_rsv_window_head.rsv_goal_size = 0; |
| 1031 | ext2_rsv_window_add(sb, &sbi->s_rsv_window_head); |
| 1032 | |
Peter Zijlstra | 833f407 | 2007-10-16 23:25:45 -0700 | [diff] [blame] | 1033 | err = percpu_counter_init(&sbi->s_freeblocks_counter, |
Mingming Cao | 0216bfc | 2006-06-23 02:05:41 -0700 | [diff] [blame] | 1034 | ext2_count_free_blocks(sb)); |
Peter Zijlstra | 833f407 | 2007-10-16 23:25:45 -0700 | [diff] [blame] | 1035 | if (!err) { |
| 1036 | err = percpu_counter_init(&sbi->s_freeinodes_counter, |
Mingming Cao | 0216bfc | 2006-06-23 02:05:41 -0700 | [diff] [blame] | 1037 | ext2_count_free_inodes(sb)); |
Peter Zijlstra | 833f407 | 2007-10-16 23:25:45 -0700 | [diff] [blame] | 1038 | } |
| 1039 | if (!err) { |
| 1040 | err = percpu_counter_init(&sbi->s_dirs_counter, |
Mingming Cao | 0216bfc | 2006-06-23 02:05:41 -0700 | [diff] [blame] | 1041 | ext2_count_dirs(sb)); |
Peter Zijlstra | 833f407 | 2007-10-16 23:25:45 -0700 | [diff] [blame] | 1042 | } |
| 1043 | if (err) { |
| 1044 | printk(KERN_ERR "EXT2-fs: insufficient memory\n"); |
| 1045 | goto failed_mount3; |
| 1046 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1047 | /* |
| 1048 | * set up enough so that it can read an inode |
| 1049 | */ |
| 1050 | sb->s_op = &ext2_sops; |
| 1051 | sb->s_export_op = &ext2_export_ops; |
| 1052 | sb->s_xattr = ext2_xattr_handlers; |
David Howells | 52fcf70 | 2008-02-07 00:15:35 -0800 | [diff] [blame] | 1053 | root = ext2_iget(sb, EXT2_ROOT_INO); |
| 1054 | if (IS_ERR(root)) { |
| 1055 | ret = PTR_ERR(root); |
| 1056 | goto failed_mount3; |
| 1057 | } |
| 1058 | if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { |
| 1059 | iput(root); |
| 1060 | printk(KERN_ERR "EXT2-fs: corrupt root inode, run e2fsck\n"); |
| 1061 | goto failed_mount3; |
| 1062 | } |
| 1063 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1064 | sb->s_root = d_alloc_root(root); |
| 1065 | if (!sb->s_root) { |
| 1066 | iput(root); |
| 1067 | printk(KERN_ERR "EXT2-fs: get root inode failed\n"); |
David Howells | 52fcf70 | 2008-02-07 00:15:35 -0800 | [diff] [blame] | 1068 | ret = -ENOMEM; |
Mingming Cao | 0216bfc | 2006-06-23 02:05:41 -0700 | [diff] [blame] | 1069 | goto failed_mount3; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1070 | } |
| 1071 | if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) |
Harvey Harrison | 605afd6 | 2008-04-28 02:16:03 -0700 | [diff] [blame] | 1072 | ext2_warning(sb, __func__, |
Johann Lombardi | ec63f22 | 2005-11-13 16:07:36 -0800 | [diff] [blame] | 1073 | "mounting ext3 filesystem as ext2"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1074 | ext2_setup_super (sb, es, sb->s_flags & MS_RDONLY); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1075 | return 0; |
| 1076 | |
| 1077 | cantfind_ext2: |
| 1078 | if (!silent) |
| 1079 | printk("VFS: Can't find an ext2 filesystem on dev %s.\n", |
| 1080 | sb->s_id); |
| 1081 | goto failed_mount; |
Mingming Cao | 0216bfc | 2006-06-23 02:05:41 -0700 | [diff] [blame] | 1082 | failed_mount3: |
| 1083 | percpu_counter_destroy(&sbi->s_freeblocks_counter); |
| 1084 | percpu_counter_destroy(&sbi->s_freeinodes_counter); |
| 1085 | percpu_counter_destroy(&sbi->s_dirs_counter); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1086 | failed_mount2: |
| 1087 | for (i = 0; i < db_count; i++) |
| 1088 | brelse(sbi->s_group_desc[i]); |
| 1089 | failed_mount_group_desc: |
| 1090 | kfree(sbi->s_group_desc); |
| 1091 | kfree(sbi->s_debts); |
| 1092 | failed_mount: |
| 1093 | brelse(bh); |
| 1094 | failed_sbi: |
| 1095 | sb->s_fs_info = NULL; |
| 1096 | kfree(sbi); |
David Howells | 52fcf70 | 2008-02-07 00:15:35 -0800 | [diff] [blame] | 1097 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1098 | } |
| 1099 | |
| 1100 | static void ext2_commit_super (struct super_block * sb, |
| 1101 | struct ext2_super_block * es) |
| 1102 | { |
| 1103 | es->s_wtime = cpu_to_le32(get_seconds()); |
| 1104 | mark_buffer_dirty(EXT2_SB(sb)->s_sbh); |
| 1105 | sb->s_dirt = 0; |
| 1106 | } |
| 1107 | |
| 1108 | static void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es) |
| 1109 | { |
| 1110 | es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb)); |
| 1111 | es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb)); |
| 1112 | es->s_wtime = cpu_to_le32(get_seconds()); |
| 1113 | mark_buffer_dirty(EXT2_SB(sb)->s_sbh); |
| 1114 | sync_dirty_buffer(EXT2_SB(sb)->s_sbh); |
| 1115 | sb->s_dirt = 0; |
| 1116 | } |
| 1117 | |
| 1118 | /* |
| 1119 | * In the second extended file system, it is not necessary to |
| 1120 | * write the super block since we use a mapping of the |
| 1121 | * disk super block in a buffer. |
| 1122 | * |
| 1123 | * However, this function is still used to set the fs valid |
| 1124 | * flags to 0. We need to set this flag to 0 since the fs |
| 1125 | * may have been checked while mounted and e2fsck may have |
| 1126 | * set s_state to EXT2_VALID_FS after some corrections. |
| 1127 | */ |
| 1128 | |
| 1129 | void ext2_write_super (struct super_block * sb) |
| 1130 | { |
| 1131 | struct ext2_super_block * es; |
| 1132 | lock_kernel(); |
| 1133 | if (!(sb->s_flags & MS_RDONLY)) { |
| 1134 | es = EXT2_SB(sb)->s_es; |
| 1135 | |
Marcin Slusarz | 31f68e1 | 2008-04-28 02:16:00 -0700 | [diff] [blame] | 1136 | if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1137 | ext2_debug ("setting valid to 0\n"); |
Marcin Slusarz | 31f68e1 | 2008-04-28 02:16:00 -0700 | [diff] [blame] | 1138 | es->s_state &= cpu_to_le16(~EXT2_VALID_FS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1139 | es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb)); |
| 1140 | es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb)); |
| 1141 | es->s_mtime = cpu_to_le32(get_seconds()); |
| 1142 | ext2_sync_super(sb, es); |
| 1143 | } else |
| 1144 | ext2_commit_super (sb, es); |
| 1145 | } |
| 1146 | sb->s_dirt = 0; |
| 1147 | unlock_kernel(); |
| 1148 | } |
| 1149 | |
| 1150 | static int ext2_remount (struct super_block * sb, int * flags, char * data) |
| 1151 | { |
| 1152 | struct ext2_sb_info * sbi = EXT2_SB(sb); |
| 1153 | struct ext2_super_block * es; |
Carsten Otte | 6d79125 | 2005-06-23 22:05:26 -0700 | [diff] [blame] | 1154 | unsigned long old_mount_opt = sbi->s_mount_opt; |
Jan Kara | 50a5223 | 2005-07-12 13:58:29 -0700 | [diff] [blame] | 1155 | struct ext2_mount_options old_opts; |
| 1156 | unsigned long old_sb_flags; |
| 1157 | int err; |
| 1158 | |
| 1159 | /* Store the old options */ |
| 1160 | old_sb_flags = sb->s_flags; |
| 1161 | old_opts.s_mount_opt = sbi->s_mount_opt; |
| 1162 | old_opts.s_resuid = sbi->s_resuid; |
| 1163 | old_opts.s_resgid = sbi->s_resgid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1164 | |
| 1165 | /* |
| 1166 | * Allow the "check" option to be passed as a remount option. |
| 1167 | */ |
Jan Kara | 50a5223 | 2005-07-12 13:58:29 -0700 | [diff] [blame] | 1168 | if (!parse_options (data, sbi)) { |
| 1169 | err = -EINVAL; |
| 1170 | goto restore_opts; |
| 1171 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1172 | |
| 1173 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | |
| 1174 | ((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); |
| 1175 | |
Carsten Otte | 266f5aa | 2007-06-23 17:16:46 -0700 | [diff] [blame] | 1176 | ext2_xip_verify_sb(sb); /* see if bdev supports xip, unset |
| 1177 | EXT2_MOUNT_XIP if not */ |
| 1178 | |
| 1179 | if ((ext2_use_xip(sb)) && (sb->s_blocksize != PAGE_SIZE)) { |
| 1180 | printk("XIP: Unsupported blocksize\n"); |
Andrew Morton | ddc80bd | 2007-06-27 14:10:08 -0700 | [diff] [blame] | 1181 | err = -EINVAL; |
Carsten Otte | 266f5aa | 2007-06-23 17:16:46 -0700 | [diff] [blame] | 1182 | goto restore_opts; |
| 1183 | } |
| 1184 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1185 | es = sbi->s_es; |
Carsten Otte | 6d79125 | 2005-06-23 22:05:26 -0700 | [diff] [blame] | 1186 | if (((sbi->s_mount_opt & EXT2_MOUNT_XIP) != |
| 1187 | (old_mount_opt & EXT2_MOUNT_XIP)) && |
Carsten Otte | 0e4a9b5 | 2009-02-11 13:04:37 -0800 | [diff] [blame] | 1188 | invalidate_inodes(sb)) { |
| 1189 | ext2_warning(sb, __func__, "refusing change of xip flag " |
| 1190 | "with busy inodes while remounting"); |
| 1191 | sbi->s_mount_opt &= ~EXT2_MOUNT_XIP; |
| 1192 | sbi->s_mount_opt |= old_mount_opt & EXT2_MOUNT_XIP; |
| 1193 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1194 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) |
| 1195 | return 0; |
| 1196 | if (*flags & MS_RDONLY) { |
| 1197 | if (le16_to_cpu(es->s_state) & EXT2_VALID_FS || |
| 1198 | !(sbi->s_mount_state & EXT2_VALID_FS)) |
| 1199 | return 0; |
| 1200 | /* |
| 1201 | * OK, we are remounting a valid rw partition rdonly, so set |
| 1202 | * the rdonly flag and then mark the partition as valid again. |
| 1203 | */ |
| 1204 | es->s_state = cpu_to_le16(sbi->s_mount_state); |
| 1205 | es->s_mtime = cpu_to_le32(get_seconds()); |
| 1206 | } else { |
| 1207 | __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb, |
| 1208 | ~EXT2_FEATURE_RO_COMPAT_SUPP); |
| 1209 | if (ret) { |
| 1210 | printk("EXT2-fs: %s: couldn't remount RDWR because of " |
| 1211 | "unsupported optional features (%x).\n", |
| 1212 | sb->s_id, le32_to_cpu(ret)); |
Jan Kara | 50a5223 | 2005-07-12 13:58:29 -0700 | [diff] [blame] | 1213 | err = -EROFS; |
| 1214 | goto restore_opts; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1215 | } |
| 1216 | /* |
| 1217 | * Mounting a RDONLY partition read-write, so reread and |
| 1218 | * store the current valid flag. (It may have been changed |
| 1219 | * by e2fsck since we originally mounted the partition.) |
| 1220 | */ |
| 1221 | sbi->s_mount_state = le16_to_cpu(es->s_state); |
| 1222 | if (!ext2_setup_super (sb, es, 0)) |
| 1223 | sb->s_flags &= ~MS_RDONLY; |
| 1224 | } |
| 1225 | ext2_sync_super(sb, es); |
| 1226 | return 0; |
Jan Kara | 50a5223 | 2005-07-12 13:58:29 -0700 | [diff] [blame] | 1227 | restore_opts: |
| 1228 | sbi->s_mount_opt = old_opts.s_mount_opt; |
| 1229 | sbi->s_resuid = old_opts.s_resuid; |
| 1230 | sbi->s_resgid = old_opts.s_resgid; |
| 1231 | sb->s_flags = old_sb_flags; |
| 1232 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1233 | } |
| 1234 | |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 1235 | static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1236 | { |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 1237 | struct super_block *sb = dentry->d_sb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1238 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
Pekka Enberg | e4fca01 | 2006-12-06 20:35:27 -0800 | [diff] [blame] | 1239 | struct ext2_super_block *es = sbi->s_es; |
Pekka Enberg | e4fca01 | 2006-12-06 20:35:27 -0800 | [diff] [blame] | 1240 | u64 fsid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1241 | |
| 1242 | if (test_opt (sb, MINIX_DF)) |
Badari Pulavarty | 2235219 | 2007-07-15 23:41:58 -0700 | [diff] [blame] | 1243 | sbi->s_overhead_last = 0; |
| 1244 | else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) { |
| 1245 | unsigned long i, overhead = 0; |
| 1246 | smp_rmb(); |
| 1247 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1248 | /* |
Badari Pulavarty | 2235219 | 2007-07-15 23:41:58 -0700 | [diff] [blame] | 1249 | * Compute the overhead (FS structures). This is constant |
| 1250 | * for a given filesystem unless the number of block groups |
| 1251 | * changes so we cache the previous value until it does. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1252 | */ |
| 1253 | |
| 1254 | /* |
| 1255 | * All of the blocks before first_data_block are |
| 1256 | * overhead |
| 1257 | */ |
Pekka Enberg | e4fca01 | 2006-12-06 20:35:27 -0800 | [diff] [blame] | 1258 | overhead = le32_to_cpu(es->s_first_data_block); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1259 | |
| 1260 | /* |
| 1261 | * Add the overhead attributed to the superblock and |
| 1262 | * block group descriptors. If the sparse superblocks |
| 1263 | * feature is turned on, then not all groups have this. |
| 1264 | */ |
| 1265 | for (i = 0; i < sbi->s_groups_count; i++) |
| 1266 | overhead += ext2_bg_has_super(sb, i) + |
| 1267 | ext2_bg_num_gdb(sb, i); |
| 1268 | |
| 1269 | /* |
| 1270 | * Every block group has an inode bitmap, a block |
| 1271 | * bitmap, and an inode table. |
| 1272 | */ |
| 1273 | overhead += (sbi->s_groups_count * |
| 1274 | (2 + sbi->s_itb_per_group)); |
Badari Pulavarty | 2235219 | 2007-07-15 23:41:58 -0700 | [diff] [blame] | 1275 | sbi->s_overhead_last = overhead; |
| 1276 | smp_wmb(); |
| 1277 | sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1278 | } |
| 1279 | |
| 1280 | buf->f_type = EXT2_SUPER_MAGIC; |
| 1281 | buf->f_bsize = sb->s_blocksize; |
Badari Pulavarty | 2235219 | 2007-07-15 23:41:58 -0700 | [diff] [blame] | 1282 | buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1283 | buf->f_bfree = ext2_count_free_blocks(sb); |
Badari Pulavarty | 2235219 | 2007-07-15 23:41:58 -0700 | [diff] [blame] | 1284 | es->s_free_blocks_count = cpu_to_le32(buf->f_bfree); |
Pekka Enberg | e4fca01 | 2006-12-06 20:35:27 -0800 | [diff] [blame] | 1285 | buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count); |
| 1286 | if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1287 | buf->f_bavail = 0; |
Pekka Enberg | e4fca01 | 2006-12-06 20:35:27 -0800 | [diff] [blame] | 1288 | buf->f_files = le32_to_cpu(es->s_inodes_count); |
| 1289 | buf->f_ffree = ext2_count_free_inodes(sb); |
Badari Pulavarty | 2235219 | 2007-07-15 23:41:58 -0700 | [diff] [blame] | 1290 | es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1291 | buf->f_namelen = EXT2_NAME_LEN; |
Pekka Enberg | e4fca01 | 2006-12-06 20:35:27 -0800 | [diff] [blame] | 1292 | fsid = le64_to_cpup((void *)es->s_uuid) ^ |
| 1293 | le64_to_cpup((void *)es->s_uuid + sizeof(u64)); |
| 1294 | buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; |
| 1295 | buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1296 | return 0; |
| 1297 | } |
| 1298 | |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 1299 | static int ext2_get_sb(struct file_system_type *fs_type, |
| 1300 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1301 | { |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 1302 | return get_sb_bdev(fs_type, flags, dev_name, data, ext2_fill_super, mnt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1303 | } |
| 1304 | |
| 1305 | #ifdef CONFIG_QUOTA |
| 1306 | |
| 1307 | /* Read data from quotafile - avoid pagecache and such because we cannot afford |
| 1308 | * acquiring the locks... As quota files are never truncated and quota code |
| 1309 | * itself serializes the operations (and noone else should touch the files) |
| 1310 | * we don't have to be afraid of races */ |
| 1311 | static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, |
| 1312 | size_t len, loff_t off) |
| 1313 | { |
| 1314 | struct inode *inode = sb_dqopt(sb)->files[type]; |
| 1315 | sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); |
| 1316 | int err = 0; |
| 1317 | int offset = off & (sb->s_blocksize - 1); |
| 1318 | int tocopy; |
| 1319 | size_t toread; |
| 1320 | struct buffer_head tmp_bh; |
| 1321 | struct buffer_head *bh; |
| 1322 | loff_t i_size = i_size_read(inode); |
| 1323 | |
| 1324 | if (off > i_size) |
| 1325 | return 0; |
| 1326 | if (off+len > i_size) |
| 1327 | len = i_size-off; |
| 1328 | toread = len; |
| 1329 | while (toread > 0) { |
| 1330 | tocopy = sb->s_blocksize - offset < toread ? |
| 1331 | sb->s_blocksize - offset : toread; |
| 1332 | |
| 1333 | tmp_bh.b_state = 0; |
Manish Katiyar | c16831b | 2009-02-12 21:57:04 +0100 | [diff] [blame] | 1334 | tmp_bh.b_size = sb->s_blocksize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1335 | err = ext2_get_block(inode, blk, &tmp_bh, 0); |
Martin J. Bligh | a686cd8 | 2007-10-16 23:30:46 -0700 | [diff] [blame] | 1336 | if (err < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1337 | return err; |
| 1338 | if (!buffer_mapped(&tmp_bh)) /* A hole? */ |
| 1339 | memset(data, 0, tocopy); |
| 1340 | else { |
| 1341 | bh = sb_bread(sb, tmp_bh.b_blocknr); |
| 1342 | if (!bh) |
| 1343 | return -EIO; |
| 1344 | memcpy(data, bh->b_data+offset, tocopy); |
| 1345 | brelse(bh); |
| 1346 | } |
| 1347 | offset = 0; |
| 1348 | toread -= tocopy; |
| 1349 | data += tocopy; |
| 1350 | blk++; |
| 1351 | } |
| 1352 | return len; |
| 1353 | } |
| 1354 | |
| 1355 | /* Write to quotafile */ |
| 1356 | static ssize_t ext2_quota_write(struct super_block *sb, int type, |
| 1357 | const char *data, size_t len, loff_t off) |
| 1358 | { |
| 1359 | struct inode *inode = sb_dqopt(sb)->files[type]; |
| 1360 | sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); |
| 1361 | int err = 0; |
| 1362 | int offset = off & (sb->s_blocksize - 1); |
| 1363 | int tocopy; |
| 1364 | size_t towrite = len; |
| 1365 | struct buffer_head tmp_bh; |
| 1366 | struct buffer_head *bh; |
| 1367 | |
Arjan van de Ven | 5c81a41 | 2006-07-03 00:25:20 -0700 | [diff] [blame] | 1368 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1369 | while (towrite > 0) { |
| 1370 | tocopy = sb->s_blocksize - offset < towrite ? |
| 1371 | sb->s_blocksize - offset : towrite; |
| 1372 | |
| 1373 | tmp_bh.b_state = 0; |
| 1374 | err = ext2_get_block(inode, blk, &tmp_bh, 1); |
Martin J. Bligh | a686cd8 | 2007-10-16 23:30:46 -0700 | [diff] [blame] | 1375 | if (err < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1376 | goto out; |
| 1377 | if (offset || tocopy != EXT2_BLOCK_SIZE(sb)) |
| 1378 | bh = sb_bread(sb, tmp_bh.b_blocknr); |
| 1379 | else |
| 1380 | bh = sb_getblk(sb, tmp_bh.b_blocknr); |
| 1381 | if (!bh) { |
| 1382 | err = -EIO; |
| 1383 | goto out; |
| 1384 | } |
| 1385 | lock_buffer(bh); |
| 1386 | memcpy(bh->b_data+offset, data, tocopy); |
| 1387 | flush_dcache_page(bh->b_page); |
| 1388 | set_buffer_uptodate(bh); |
| 1389 | mark_buffer_dirty(bh); |
| 1390 | unlock_buffer(bh); |
| 1391 | brelse(bh); |
| 1392 | offset = 0; |
| 1393 | towrite -= tocopy; |
| 1394 | data += tocopy; |
| 1395 | blk++; |
| 1396 | } |
| 1397 | out: |
| 1398 | if (len == towrite) |
| 1399 | return err; |
| 1400 | if (inode->i_size < off+len-towrite) |
| 1401 | i_size_write(inode, off+len-towrite); |
| 1402 | inode->i_version++; |
| 1403 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
| 1404 | mark_inode_dirty(inode); |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 1405 | mutex_unlock(&inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1406 | return len - towrite; |
| 1407 | } |
| 1408 | |
| 1409 | #endif |
| 1410 | |
| 1411 | static struct file_system_type ext2_fs_type = { |
| 1412 | .owner = THIS_MODULE, |
| 1413 | .name = "ext2", |
| 1414 | .get_sb = ext2_get_sb, |
| 1415 | .kill_sb = kill_block_super, |
| 1416 | .fs_flags = FS_REQUIRES_DEV, |
| 1417 | }; |
| 1418 | |
| 1419 | static int __init init_ext2_fs(void) |
| 1420 | { |
| 1421 | int err = init_ext2_xattr(); |
| 1422 | if (err) |
| 1423 | return err; |
| 1424 | err = init_inodecache(); |
| 1425 | if (err) |
| 1426 | goto out1; |
| 1427 | err = register_filesystem(&ext2_fs_type); |
| 1428 | if (err) |
| 1429 | goto out; |
| 1430 | return 0; |
| 1431 | out: |
| 1432 | destroy_inodecache(); |
| 1433 | out1: |
| 1434 | exit_ext2_xattr(); |
| 1435 | return err; |
| 1436 | } |
| 1437 | |
| 1438 | static void __exit exit_ext2_fs(void) |
| 1439 | { |
| 1440 | unregister_filesystem(&ext2_fs_type); |
| 1441 | destroy_inodecache(); |
| 1442 | exit_ext2_xattr(); |
| 1443 | } |
| 1444 | |
| 1445 | module_init(init_ext2_fs) |
| 1446 | module_exit(exit_ext2_fs) |