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, |
Jan Blunck | ee6921e | 2010-04-14 14:38:36 +0200 | [diff] [blame] | 42 | struct ext2_super_block *es, int wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 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); |
Christoph Hellwig | 40f31dd | 2009-06-08 10:04:17 +0200 | [diff] [blame] | 45 | static int ext2_sync_fs(struct super_block *sb, int wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 46 | |
| 47 | void ext2_error (struct super_block * sb, const char * function, |
| 48 | const char * fmt, ...) |
| 49 | { |
| 50 | va_list args; |
| 51 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
| 52 | struct ext2_super_block *es = sbi->s_es; |
| 53 | |
| 54 | if (!(sb->s_flags & MS_RDONLY)) { |
Jan Blunck | c15271f | 2010-04-14 14:38:38 +0200 | [diff] [blame^] | 55 | spin_lock(&sbi->s_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 56 | sbi->s_mount_state |= EXT2_ERROR_FS; |
Marcin Slusarz | 31f68e1 | 2008-04-28 02:16:00 -0700 | [diff] [blame] | 57 | es->s_state |= cpu_to_le16(EXT2_ERROR_FS); |
Jan Blunck | c15271f | 2010-04-14 14:38:38 +0200 | [diff] [blame^] | 58 | spin_unlock(&sbi->s_lock); |
Jan Blunck | ee6921e | 2010-04-14 14:38:36 +0200 | [diff] [blame] | 59 | ext2_sync_super(sb, es, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 60 | } |
| 61 | |
| 62 | va_start(args, fmt); |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 63 | printk(KERN_CRIT "EXT2-fs (%s): error: %s: ", sb->s_id, function); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 64 | vprintk(fmt, args); |
| 65 | printk("\n"); |
| 66 | va_end(args); |
| 67 | |
| 68 | if (test_opt(sb, ERRORS_PANIC)) |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 69 | panic("EXT2-fs: panic from previous error\n"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 70 | if (test_opt(sb, ERRORS_RO)) { |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 71 | ext2_msg(sb, KERN_CRIT, |
| 72 | "error: remounting filesystem read-only"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 73 | sb->s_flags |= MS_RDONLY; |
| 74 | } |
| 75 | } |
| 76 | |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 77 | void ext2_msg(struct super_block *sb, const char *prefix, |
| 78 | const char *fmt, ...) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 79 | { |
| 80 | va_list args; |
| 81 | |
| 82 | va_start(args, fmt); |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 83 | printk("%sEXT2-fs (%s): ", prefix, sb->s_id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 84 | vprintk(fmt, args); |
| 85 | printk("\n"); |
| 86 | va_end(args); |
| 87 | } |
| 88 | |
Jan Blunck | c15271f | 2010-04-14 14:38:38 +0200 | [diff] [blame^] | 89 | /* |
| 90 | * This must be called with sbi->s_lock held. |
| 91 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 92 | void ext2_update_dynamic_rev(struct super_block *sb) |
| 93 | { |
| 94 | struct ext2_super_block *es = EXT2_SB(sb)->s_es; |
| 95 | |
| 96 | if (le32_to_cpu(es->s_rev_level) > EXT2_GOOD_OLD_REV) |
| 97 | return; |
| 98 | |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 99 | ext2_msg(sb, KERN_WARNING, |
| 100 | "warning: updating to rev %d because of " |
| 101 | "new feature flag, running e2fsck is recommended", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 102 | EXT2_DYNAMIC_REV); |
| 103 | |
| 104 | es->s_first_ino = cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO); |
| 105 | es->s_inode_size = cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE); |
| 106 | es->s_rev_level = cpu_to_le32(EXT2_DYNAMIC_REV); |
| 107 | /* leave es->s_feature_*compat flags alone */ |
| 108 | /* es->s_uuid will be set by e2fsck if empty */ |
| 109 | |
| 110 | /* |
| 111 | * The rest of the superblock fields should be zero, and if not it |
| 112 | * means they are likely already in use, so leave them alone. We |
| 113 | * can leave it up to e2fsck to clean up any inconsistencies there. |
| 114 | */ |
| 115 | } |
| 116 | |
| 117 | static void ext2_put_super (struct super_block * sb) |
| 118 | { |
| 119 | int db_count; |
| 120 | int i; |
| 121 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
| 122 | |
Christoph Hellwig | 6cfd014 | 2009-05-05 15:40:36 +0200 | [diff] [blame] | 123 | lock_kernel(); |
| 124 | |
Christoph Hellwig | 8c85e12 | 2009-04-28 18:00:26 +0200 | [diff] [blame] | 125 | if (sb->s_dirt) |
| 126 | ext2_write_super(sb); |
| 127 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 128 | ext2_xattr_put_super(sb); |
| 129 | if (!(sb->s_flags & MS_RDONLY)) { |
| 130 | struct ext2_super_block *es = sbi->s_es; |
| 131 | |
Jan Blunck | c15271f | 2010-04-14 14:38:38 +0200 | [diff] [blame^] | 132 | spin_lock(&sbi->s_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 133 | es->s_state = cpu_to_le16(sbi->s_mount_state); |
Jan Blunck | c15271f | 2010-04-14 14:38:38 +0200 | [diff] [blame^] | 134 | spin_unlock(&sbi->s_lock); |
Jan Blunck | ee6921e | 2010-04-14 14:38:36 +0200 | [diff] [blame] | 135 | ext2_sync_super(sb, es, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 136 | } |
| 137 | db_count = sbi->s_gdb_count; |
| 138 | for (i = 0; i < db_count; i++) |
| 139 | if (sbi->s_group_desc[i]) |
| 140 | brelse (sbi->s_group_desc[i]); |
| 141 | kfree(sbi->s_group_desc); |
| 142 | kfree(sbi->s_debts); |
| 143 | percpu_counter_destroy(&sbi->s_freeblocks_counter); |
| 144 | percpu_counter_destroy(&sbi->s_freeinodes_counter); |
| 145 | percpu_counter_destroy(&sbi->s_dirs_counter); |
| 146 | brelse (sbi->s_sbh); |
| 147 | sb->s_fs_info = NULL; |
Pekka J Enberg | 18a82eb | 2009-01-07 18:07:19 -0800 | [diff] [blame] | 148 | kfree(sbi->s_blockgroup_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 149 | kfree(sbi); |
| 150 | |
Christoph Hellwig | 6cfd014 | 2009-05-05 15:40:36 +0200 | [diff] [blame] | 151 | unlock_kernel(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 152 | } |
| 153 | |
Christoph Lameter | e18b890 | 2006-12-06 20:33:20 -0800 | [diff] [blame] | 154 | static struct kmem_cache * ext2_inode_cachep; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 155 | |
| 156 | static struct inode *ext2_alloc_inode(struct super_block *sb) |
| 157 | { |
| 158 | struct ext2_inode_info *ei; |
Christoph Lameter | e94b176 | 2006-12-06 20:33:17 -0800 | [diff] [blame] | 159 | 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] | 160 | if (!ei) |
| 161 | return NULL; |
Martin J. Bligh | a686cd8 | 2007-10-16 23:30:46 -0700 | [diff] [blame] | 162 | ei->i_block_alloc_info = NULL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 163 | ei->vfs_inode.i_version = 1; |
| 164 | return &ei->vfs_inode; |
| 165 | } |
| 166 | |
| 167 | static void ext2_destroy_inode(struct inode *inode) |
| 168 | { |
| 169 | kmem_cache_free(ext2_inode_cachep, EXT2_I(inode)); |
| 170 | } |
| 171 | |
Alexey Dobriyan | 51cc506 | 2008-07-25 19:45:34 -0700 | [diff] [blame] | 172 | static void init_once(void *foo) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 173 | { |
| 174 | struct ext2_inode_info *ei = (struct ext2_inode_info *) foo; |
| 175 | |
Christoph Lameter | a35afb8 | 2007-05-16 22:10:57 -0700 | [diff] [blame] | 176 | rwlock_init(&ei->i_meta_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 177 | #ifdef CONFIG_EXT2_FS_XATTR |
Christoph Lameter | a35afb8 | 2007-05-16 22:10:57 -0700 | [diff] [blame] | 178 | init_rwsem(&ei->xattr_sem); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 179 | #endif |
Martin J. Bligh | a686cd8 | 2007-10-16 23:30:46 -0700 | [diff] [blame] | 180 | mutex_init(&ei->truncate_mutex); |
Christoph Lameter | a35afb8 | 2007-05-16 22:10:57 -0700 | [diff] [blame] | 181 | inode_init_once(&ei->vfs_inode); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 182 | } |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 183 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 184 | static int init_inodecache(void) |
| 185 | { |
| 186 | ext2_inode_cachep = kmem_cache_create("ext2_inode_cache", |
| 187 | sizeof(struct ext2_inode_info), |
Paul Jackson | fffb60f | 2006-03-24 03:16:06 -0800 | [diff] [blame] | 188 | 0, (SLAB_RECLAIM_ACCOUNT| |
| 189 | SLAB_MEM_SPREAD), |
Paul Mundt | 20c2df8 | 2007-07-20 10:11:58 +0900 | [diff] [blame] | 190 | init_once); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 191 | if (ext2_inode_cachep == NULL) |
| 192 | return -ENOMEM; |
| 193 | return 0; |
| 194 | } |
| 195 | |
| 196 | static void destroy_inodecache(void) |
| 197 | { |
Alexey Dobriyan | 1a1d92c | 2006-09-27 01:49:40 -0700 | [diff] [blame] | 198 | kmem_cache_destroy(ext2_inode_cachep); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 199 | } |
| 200 | |
| 201 | static void ext2_clear_inode(struct inode *inode) |
| 202 | { |
Martin J. Bligh | a686cd8 | 2007-10-16 23:30:46 -0700 | [diff] [blame] | 203 | struct ext2_block_alloc_info *rsv = EXT2_I(inode)->i_block_alloc_info; |
Christoph Hellwig | 257ba15 | 2010-03-03 09:05:04 -0500 | [diff] [blame] | 204 | |
Christoph Hellwig | 9f75475 | 2010-03-03 09:05:05 -0500 | [diff] [blame] | 205 | dquot_drop(inode); |
Martin J. Bligh | a686cd8 | 2007-10-16 23:30:46 -0700 | [diff] [blame] | 206 | ext2_discard_reservation(inode); |
| 207 | EXT2_I(inode)->i_block_alloc_info = NULL; |
| 208 | if (unlikely(rsv)) |
| 209 | kfree(rsv); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 210 | } |
| 211 | |
Mark Bellon | 8fc2751 | 2005-09-06 15:16:54 -0700 | [diff] [blame] | 212 | static int ext2_show_options(struct seq_file *seq, struct vfsmount *vfs) |
| 213 | { |
Miklos Szeredi | 93d44cb | 2007-10-16 23:26:26 -0700 | [diff] [blame] | 214 | struct super_block *sb = vfs->mnt_sb; |
| 215 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
| 216 | struct ext2_super_block *es = sbi->s_es; |
| 217 | unsigned long def_mount_opts; |
Mark Bellon | 8fc2751 | 2005-09-06 15:16:54 -0700 | [diff] [blame] | 218 | |
Jan Blunck | c15271f | 2010-04-14 14:38:38 +0200 | [diff] [blame^] | 219 | spin_lock(&sbi->s_lock); |
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 | |
Jan Blunck | c15271f | 2010-04-14 14:38:38 +0200 | [diff] [blame^] | 292 | spin_unlock(&sbi->s_lock); |
Mark Bellon | 8fc2751 | 2005-09-06 15:16:54 -0700 | [diff] [blame] | 293 | return 0; |
| 294 | } |
| 295 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 296 | #ifdef CONFIG_QUOTA |
| 297 | static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off); |
| 298 | static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off); |
| 299 | #endif |
| 300 | |
Josef 'Jeff' Sipek | ee9b6d6 | 2007-02-12 00:55:41 -0800 | [diff] [blame] | 301 | static const struct super_operations ext2_sops = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 302 | .alloc_inode = ext2_alloc_inode, |
| 303 | .destroy_inode = ext2_destroy_inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 304 | .write_inode = ext2_write_inode, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 305 | .delete_inode = ext2_delete_inode, |
| 306 | .put_super = ext2_put_super, |
| 307 | .write_super = ext2_write_super, |
Christoph Hellwig | 40f31dd | 2009-06-08 10:04:17 +0200 | [diff] [blame] | 308 | .sync_fs = ext2_sync_fs, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 309 | .statfs = ext2_statfs, |
| 310 | .remount_fs = ext2_remount, |
| 311 | .clear_inode = ext2_clear_inode, |
Mark Bellon | 8fc2751 | 2005-09-06 15:16:54 -0700 | [diff] [blame] | 312 | .show_options = ext2_show_options, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 313 | #ifdef CONFIG_QUOTA |
| 314 | .quota_read = ext2_quota_read, |
| 315 | .quota_write = ext2_quota_write, |
| 316 | #endif |
| 317 | }; |
| 318 | |
Christoph Hellwig | 2e4c68e | 2007-10-21 16:42:07 -0700 | [diff] [blame] | 319 | static struct inode *ext2_nfs_get_inode(struct super_block *sb, |
| 320 | u64 ino, u32 generation) |
NeilBrown | ecaff75 | 2006-09-16 12:15:37 -0700 | [diff] [blame] | 321 | { |
NeilBrown | ecaff75 | 2006-09-16 12:15:37 -0700 | [diff] [blame] | 322 | struct inode *inode; |
NeilBrown | ecaff75 | 2006-09-16 12:15:37 -0700 | [diff] [blame] | 323 | |
| 324 | if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO) |
| 325 | return ERR_PTR(-ESTALE); |
| 326 | if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count)) |
| 327 | return ERR_PTR(-ESTALE); |
| 328 | |
| 329 | /* iget isn't really right if the inode is currently unallocated!! |
| 330 | * ext2_read_inode currently does appropriate checks, but |
| 331 | * it might be "neater" to call ext2_get_inode first and check |
| 332 | * if the inode is valid..... |
| 333 | */ |
David Howells | 52fcf70 | 2008-02-07 00:15:35 -0800 | [diff] [blame] | 334 | inode = ext2_iget(sb, ino); |
| 335 | if (IS_ERR(inode)) |
| 336 | return ERR_CAST(inode); |
| 337 | if (generation && inode->i_generation != generation) { |
NeilBrown | ecaff75 | 2006-09-16 12:15:37 -0700 | [diff] [blame] | 338 | /* we didn't find the right inode.. */ |
| 339 | iput(inode); |
| 340 | return ERR_PTR(-ESTALE); |
| 341 | } |
Christoph Hellwig | 2e4c68e | 2007-10-21 16:42:07 -0700 | [diff] [blame] | 342 | return inode; |
| 343 | } |
| 344 | |
| 345 | static struct dentry *ext2_fh_to_dentry(struct super_block *sb, struct fid *fid, |
| 346 | int fh_len, int fh_type) |
| 347 | { |
| 348 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, |
| 349 | ext2_nfs_get_inode); |
| 350 | } |
| 351 | |
| 352 | static struct dentry *ext2_fh_to_parent(struct super_block *sb, struct fid *fid, |
| 353 | int fh_len, int fh_type) |
| 354 | { |
| 355 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, |
| 356 | ext2_nfs_get_inode); |
NeilBrown | ecaff75 | 2006-09-16 12:15:37 -0700 | [diff] [blame] | 357 | } |
| 358 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 359 | /* Yes, most of these are left as NULL!! |
| 360 | * A NULL value implies the default, which works with ext2-like file |
| 361 | * systems, but can be improved upon. |
| 362 | * Currently only get_parent is required. |
| 363 | */ |
Christoph Hellwig | 3965516 | 2007-10-21 16:42:17 -0700 | [diff] [blame] | 364 | static const struct export_operations ext2_export_ops = { |
Christoph Hellwig | 2e4c68e | 2007-10-21 16:42:07 -0700 | [diff] [blame] | 365 | .fh_to_dentry = ext2_fh_to_dentry, |
| 366 | .fh_to_parent = ext2_fh_to_parent, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 367 | .get_parent = ext2_get_parent, |
| 368 | }; |
| 369 | |
| 370 | static unsigned long get_sb_block(void **data) |
| 371 | { |
| 372 | unsigned long sb_block; |
| 373 | char *options = (char *) *data; |
| 374 | |
| 375 | if (!options || strncmp(options, "sb=", 3) != 0) |
| 376 | return 1; /* Default location */ |
| 377 | options += 3; |
| 378 | sb_block = simple_strtoul(options, &options, 0); |
| 379 | if (*options && *options != ',') { |
| 380 | printk("EXT2-fs: Invalid sb specification: %s\n", |
| 381 | (char *) *data); |
| 382 | return 1; |
| 383 | } |
| 384 | if (*options == ',') |
| 385 | options++; |
| 386 | *data = (void *) options; |
| 387 | return sb_block; |
| 388 | } |
| 389 | |
| 390 | enum { |
| 391 | Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, |
Mark Bellon | 8fc2751 | 2005-09-06 15:16:54 -0700 | [diff] [blame] | 392 | Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, |
Adrian Bunk | 2860b73 | 2005-11-08 21:34:59 -0800 | [diff] [blame] | 393 | Opt_err_ro, Opt_nouid32, Opt_nocheck, Opt_debug, |
Mark Bellon | 8fc2751 | 2005-09-06 15:16:54 -0700 | [diff] [blame] | 394 | Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr, |
| 395 | 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] | 396 | Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 397 | }; |
| 398 | |
Steven Whitehouse | a447c09 | 2008-10-13 10:46:57 +0100 | [diff] [blame] | 399 | static const match_table_t tokens = { |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 400 | {Opt_bsd_df, "bsddf"}, |
| 401 | {Opt_minix_df, "minixdf"}, |
| 402 | {Opt_grpid, "grpid"}, |
| 403 | {Opt_grpid, "bsdgroups"}, |
| 404 | {Opt_nogrpid, "nogrpid"}, |
| 405 | {Opt_nogrpid, "sysvgroups"}, |
| 406 | {Opt_resgid, "resgid=%u"}, |
| 407 | {Opt_resuid, "resuid=%u"}, |
| 408 | {Opt_sb, "sb=%u"}, |
| 409 | {Opt_err_cont, "errors=continue"}, |
| 410 | {Opt_err_panic, "errors=panic"}, |
| 411 | {Opt_err_ro, "errors=remount-ro"}, |
| 412 | {Opt_nouid32, "nouid32"}, |
| 413 | {Opt_nocheck, "check=none"}, |
| 414 | {Opt_nocheck, "nocheck"}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 415 | {Opt_debug, "debug"}, |
| 416 | {Opt_oldalloc, "oldalloc"}, |
| 417 | {Opt_orlov, "orlov"}, |
| 418 | {Opt_nobh, "nobh"}, |
| 419 | {Opt_user_xattr, "user_xattr"}, |
| 420 | {Opt_nouser_xattr, "nouser_xattr"}, |
| 421 | {Opt_acl, "acl"}, |
| 422 | {Opt_noacl, "noacl"}, |
Carsten Otte | 6d79125 | 2005-06-23 22:05:26 -0700 | [diff] [blame] | 423 | {Opt_xip, "xip"}, |
Mark Bellon | 8fc2751 | 2005-09-06 15:16:54 -0700 | [diff] [blame] | 424 | {Opt_grpquota, "grpquota"}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 425 | {Opt_ignore, "noquota"}, |
Mark Bellon | 8fc2751 | 2005-09-06 15:16:54 -0700 | [diff] [blame] | 426 | {Opt_quota, "quota"}, |
| 427 | {Opt_usrquota, "usrquota"}, |
Martin J. Bligh | a686cd8 | 2007-10-16 23:30:46 -0700 | [diff] [blame] | 428 | {Opt_reservation, "reservation"}, |
| 429 | {Opt_noreservation, "noreservation"}, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 430 | {Opt_err, NULL} |
| 431 | }; |
| 432 | |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 433 | static int parse_options(char *options, struct super_block *sb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 434 | { |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 435 | char *p; |
| 436 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 437 | substring_t args[MAX_OPT_ARGS]; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 438 | int option; |
| 439 | |
| 440 | if (!options) |
| 441 | return 1; |
| 442 | |
| 443 | while ((p = strsep (&options, ",")) != NULL) { |
| 444 | int token; |
| 445 | if (!*p) |
| 446 | continue; |
| 447 | |
| 448 | token = match_token(p, tokens, args); |
| 449 | switch (token) { |
| 450 | case Opt_bsd_df: |
| 451 | clear_opt (sbi->s_mount_opt, MINIX_DF); |
| 452 | break; |
| 453 | case Opt_minix_df: |
| 454 | set_opt (sbi->s_mount_opt, MINIX_DF); |
| 455 | break; |
| 456 | case Opt_grpid: |
| 457 | set_opt (sbi->s_mount_opt, GRPID); |
| 458 | break; |
| 459 | case Opt_nogrpid: |
| 460 | clear_opt (sbi->s_mount_opt, GRPID); |
| 461 | break; |
| 462 | case Opt_resuid: |
| 463 | if (match_int(&args[0], &option)) |
| 464 | return 0; |
| 465 | sbi->s_resuid = option; |
| 466 | break; |
| 467 | case Opt_resgid: |
| 468 | if (match_int(&args[0], &option)) |
| 469 | return 0; |
| 470 | sbi->s_resgid = option; |
| 471 | break; |
| 472 | case Opt_sb: |
| 473 | /* handled by get_sb_block() instead of here */ |
| 474 | /* *sb_block = match_int(&args[0]); */ |
| 475 | break; |
| 476 | case Opt_err_panic: |
Vasily Averin | 5a2b406 | 2006-10-11 01:21:50 -0700 | [diff] [blame] | 477 | clear_opt (sbi->s_mount_opt, ERRORS_CONT); |
| 478 | clear_opt (sbi->s_mount_opt, ERRORS_RO); |
| 479 | set_opt (sbi->s_mount_opt, ERRORS_PANIC); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 480 | break; |
| 481 | case Opt_err_ro: |
Vasily Averin | 5a2b406 | 2006-10-11 01:21:50 -0700 | [diff] [blame] | 482 | clear_opt (sbi->s_mount_opt, ERRORS_CONT); |
| 483 | clear_opt (sbi->s_mount_opt, ERRORS_PANIC); |
| 484 | set_opt (sbi->s_mount_opt, ERRORS_RO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 485 | break; |
| 486 | case Opt_err_cont: |
Vasily Averin | 5a2b406 | 2006-10-11 01:21:50 -0700 | [diff] [blame] | 487 | clear_opt (sbi->s_mount_opt, ERRORS_RO); |
| 488 | clear_opt (sbi->s_mount_opt, ERRORS_PANIC); |
| 489 | set_opt (sbi->s_mount_opt, ERRORS_CONT); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 490 | break; |
| 491 | case Opt_nouid32: |
| 492 | set_opt (sbi->s_mount_opt, NO_UID32); |
| 493 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 494 | case Opt_nocheck: |
| 495 | clear_opt (sbi->s_mount_opt, CHECK); |
| 496 | break; |
| 497 | case Opt_debug: |
| 498 | set_opt (sbi->s_mount_opt, DEBUG); |
| 499 | break; |
| 500 | case Opt_oldalloc: |
| 501 | set_opt (sbi->s_mount_opt, OLDALLOC); |
| 502 | break; |
| 503 | case Opt_orlov: |
| 504 | clear_opt (sbi->s_mount_opt, OLDALLOC); |
| 505 | break; |
| 506 | case Opt_nobh: |
| 507 | set_opt (sbi->s_mount_opt, NOBH); |
| 508 | break; |
| 509 | #ifdef CONFIG_EXT2_FS_XATTR |
| 510 | case Opt_user_xattr: |
| 511 | set_opt (sbi->s_mount_opt, XATTR_USER); |
| 512 | break; |
| 513 | case Opt_nouser_xattr: |
| 514 | clear_opt (sbi->s_mount_opt, XATTR_USER); |
| 515 | break; |
| 516 | #else |
| 517 | case Opt_user_xattr: |
| 518 | case Opt_nouser_xattr: |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 519 | ext2_msg(sb, KERN_INFO, "(no)user_xattr options" |
| 520 | "not supported"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 521 | break; |
| 522 | #endif |
| 523 | #ifdef CONFIG_EXT2_FS_POSIX_ACL |
| 524 | case Opt_acl: |
| 525 | set_opt(sbi->s_mount_opt, POSIX_ACL); |
| 526 | break; |
| 527 | case Opt_noacl: |
| 528 | clear_opt(sbi->s_mount_opt, POSIX_ACL); |
| 529 | break; |
| 530 | #else |
| 531 | case Opt_acl: |
| 532 | case Opt_noacl: |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 533 | ext2_msg(sb, KERN_INFO, |
| 534 | "(no)acl options not supported"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 535 | break; |
| 536 | #endif |
Carsten Otte | 6d79125 | 2005-06-23 22:05:26 -0700 | [diff] [blame] | 537 | case Opt_xip: |
| 538 | #ifdef CONFIG_EXT2_FS_XIP |
| 539 | set_opt (sbi->s_mount_opt, XIP); |
| 540 | #else |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 541 | ext2_msg(sb, KERN_INFO, "xip option not supported"); |
Carsten Otte | 6d79125 | 2005-06-23 22:05:26 -0700 | [diff] [blame] | 542 | #endif |
| 543 | break; |
Mark Bellon | 8fc2751 | 2005-09-06 15:16:54 -0700 | [diff] [blame] | 544 | |
| 545 | #if defined(CONFIG_QUOTA) |
| 546 | case Opt_quota: |
| 547 | case Opt_usrquota: |
| 548 | set_opt(sbi->s_mount_opt, USRQUOTA); |
| 549 | break; |
| 550 | |
| 551 | case Opt_grpquota: |
| 552 | set_opt(sbi->s_mount_opt, GRPQUOTA); |
| 553 | break; |
| 554 | #else |
| 555 | case Opt_quota: |
| 556 | case Opt_usrquota: |
| 557 | case Opt_grpquota: |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 558 | ext2_msg(sb, KERN_INFO, |
| 559 | "quota operations not supported"); |
Mark Bellon | 8fc2751 | 2005-09-06 15:16:54 -0700 | [diff] [blame] | 560 | break; |
| 561 | #endif |
| 562 | |
Martin J. Bligh | a686cd8 | 2007-10-16 23:30:46 -0700 | [diff] [blame] | 563 | case Opt_reservation: |
| 564 | set_opt(sbi->s_mount_opt, RESERVATION); |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 565 | ext2_msg(sb, KERN_INFO, "reservations ON"); |
Martin J. Bligh | a686cd8 | 2007-10-16 23:30:46 -0700 | [diff] [blame] | 566 | break; |
| 567 | case Opt_noreservation: |
| 568 | clear_opt(sbi->s_mount_opt, RESERVATION); |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 569 | ext2_msg(sb, KERN_INFO, "reservations OFF"); |
Martin J. Bligh | a686cd8 | 2007-10-16 23:30:46 -0700 | [diff] [blame] | 570 | break; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 571 | case Opt_ignore: |
| 572 | break; |
| 573 | default: |
| 574 | return 0; |
| 575 | } |
| 576 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 577 | return 1; |
| 578 | } |
| 579 | |
| 580 | static int ext2_setup_super (struct super_block * sb, |
| 581 | struct ext2_super_block * es, |
| 582 | int read_only) |
| 583 | { |
| 584 | int res = 0; |
| 585 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
| 586 | |
| 587 | if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) { |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 588 | ext2_msg(sb, KERN_ERR, |
| 589 | "error: revision level too high, " |
| 590 | "forcing read-only mode"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 591 | res = MS_RDONLY; |
| 592 | } |
| 593 | if (read_only) |
| 594 | return res; |
| 595 | if (!(sbi->s_mount_state & EXT2_VALID_FS)) |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 596 | ext2_msg(sb, KERN_WARNING, |
| 597 | "warning: mounting unchecked fs, " |
| 598 | "running e2fsck is recommended"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 599 | else if ((sbi->s_mount_state & EXT2_ERROR_FS)) |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 600 | ext2_msg(sb, KERN_WARNING, |
| 601 | "warning: mounting fs with errors, " |
| 602 | "running e2fsck is recommended"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 603 | else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && |
| 604 | le16_to_cpu(es->s_mnt_count) >= |
| 605 | (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 606 | ext2_msg(sb, KERN_WARNING, |
| 607 | "warning: maximal mount count reached, " |
| 608 | "running e2fsck is recommended"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 609 | else if (le32_to_cpu(es->s_checkinterval) && |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 610 | (le32_to_cpu(es->s_lastcheck) + |
| 611 | le32_to_cpu(es->s_checkinterval) <= get_seconds())) |
| 612 | ext2_msg(sb, KERN_WARNING, |
| 613 | "warning: checktime reached, " |
| 614 | "running e2fsck is recommended"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 615 | if (!le16_to_cpu(es->s_max_mnt_count)) |
| 616 | 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] | 617 | le16_add_cpu(&es->s_mnt_count, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 618 | if (test_opt (sb, DEBUG)) |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 619 | ext2_msg(sb, KERN_INFO, "%s, %s, bs=%lu, fs=%lu, gc=%lu, " |
| 620 | "bpg=%lu, ipg=%lu, mo=%04lx]", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 621 | EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize, |
| 622 | sbi->s_frag_size, |
| 623 | sbi->s_groups_count, |
| 624 | EXT2_BLOCKS_PER_GROUP(sb), |
| 625 | EXT2_INODES_PER_GROUP(sb), |
| 626 | sbi->s_mount_opt); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 627 | return res; |
| 628 | } |
| 629 | |
Akinobu Mita | 197cd65a | 2008-02-06 01:40:16 -0800 | [diff] [blame] | 630 | static int ext2_check_descriptors(struct super_block *sb) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 631 | { |
| 632 | int i; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 633 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 634 | |
| 635 | ext2_debug ("Checking group descriptors"); |
| 636 | |
Akinobu Mita | 197cd65a | 2008-02-06 01:40:16 -0800 | [diff] [blame] | 637 | for (i = 0; i < sbi->s_groups_count; i++) { |
| 638 | struct ext2_group_desc *gdp = ext2_get_group_desc(sb, i, NULL); |
Akinobu Mita | 24097d1 | 2008-04-28 02:16:01 -0700 | [diff] [blame] | 639 | ext2_fsblk_t first_block = ext2_group_first_block_no(sb, i); |
| 640 | ext2_fsblk_t last_block; |
Akinobu Mita | 197cd65a | 2008-02-06 01:40:16 -0800 | [diff] [blame] | 641 | |
Eric Sandeen | 41f04d8 | 2006-09-27 01:49:30 -0700 | [diff] [blame] | 642 | if (i == sbi->s_groups_count - 1) |
| 643 | last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1; |
| 644 | else |
| 645 | last_block = first_block + |
| 646 | (EXT2_BLOCKS_PER_GROUP(sb) - 1); |
| 647 | |
Eric Sandeen | 41f04d8 | 2006-09-27 01:49:30 -0700 | [diff] [blame] | 648 | if (le32_to_cpu(gdp->bg_block_bitmap) < first_block || |
| 649 | le32_to_cpu(gdp->bg_block_bitmap) > last_block) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 650 | { |
| 651 | ext2_error (sb, "ext2_check_descriptors", |
| 652 | "Block bitmap for group %d" |
| 653 | " not in group (block %lu)!", |
| 654 | i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap)); |
| 655 | return 0; |
| 656 | } |
Eric Sandeen | 41f04d8 | 2006-09-27 01:49:30 -0700 | [diff] [blame] | 657 | if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block || |
| 658 | le32_to_cpu(gdp->bg_inode_bitmap) > last_block) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 659 | { |
| 660 | ext2_error (sb, "ext2_check_descriptors", |
| 661 | "Inode bitmap for group %d" |
| 662 | " not in group (block %lu)!", |
| 663 | i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap)); |
| 664 | return 0; |
| 665 | } |
Eric Sandeen | 41f04d8 | 2006-09-27 01:49:30 -0700 | [diff] [blame] | 666 | if (le32_to_cpu(gdp->bg_inode_table) < first_block || |
Eric Sandeen | 780dcdb | 2007-07-26 10:41:11 -0700 | [diff] [blame] | 667 | 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] | 668 | last_block) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 669 | { |
| 670 | ext2_error (sb, "ext2_check_descriptors", |
| 671 | "Inode table for group %d" |
| 672 | " not in group (block %lu)!", |
| 673 | i, (unsigned long) le32_to_cpu(gdp->bg_inode_table)); |
| 674 | return 0; |
| 675 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 676 | } |
| 677 | return 1; |
| 678 | } |
| 679 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 680 | /* |
| 681 | * Maximal file size. There is a direct, and {,double-,triple-}indirect |
| 682 | * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. |
| 683 | * We need to be 1 filesystem block less than the 2^32 sector limit. |
| 684 | */ |
| 685 | static loff_t ext2_max_size(int bits) |
| 686 | { |
| 687 | loff_t res = EXT2_NDIR_BLOCKS; |
Aneesh Kumar K.V | 902be4c | 2008-01-28 23:58:26 -0500 | [diff] [blame] | 688 | int meta_blocks; |
| 689 | loff_t upper_limit; |
| 690 | |
| 691 | /* This is calculated to be the largest file size for a |
| 692 | * dense, file such that the total number of |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 693 | * sectors in the file, including data and all indirect blocks, |
Aneesh Kumar K.V | 902be4c | 2008-01-28 23:58:26 -0500 | [diff] [blame] | 694 | * does not exceed 2^32 -1 |
| 695 | * __u32 i_blocks representing the total number of |
| 696 | * 512 bytes blocks of the file |
| 697 | */ |
| 698 | upper_limit = (1LL << 32) - 1; |
| 699 | |
| 700 | /* total blocks in file system block size */ |
| 701 | upper_limit >>= (bits - 9); |
| 702 | |
| 703 | |
| 704 | /* indirect blocks */ |
| 705 | meta_blocks = 1; |
| 706 | /* double indirect blocks */ |
| 707 | meta_blocks += 1 + (1LL << (bits-2)); |
| 708 | /* tripple indirect blocks */ |
| 709 | meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2))); |
| 710 | |
| 711 | upper_limit -= meta_blocks; |
| 712 | upper_limit <<= bits; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 713 | |
| 714 | res += 1LL << (bits-2); |
| 715 | res += 1LL << (2*(bits-2)); |
| 716 | res += 1LL << (3*(bits-2)); |
| 717 | res <<= bits; |
| 718 | if (res > upper_limit) |
| 719 | res = upper_limit; |
Aneesh Kumar K.V | 902be4c | 2008-01-28 23:58:26 -0500 | [diff] [blame] | 720 | |
| 721 | if (res > MAX_LFS_FILESIZE) |
| 722 | res = MAX_LFS_FILESIZE; |
| 723 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 724 | return res; |
| 725 | } |
| 726 | |
| 727 | static unsigned long descriptor_loc(struct super_block *sb, |
| 728 | unsigned long logic_sb_block, |
| 729 | int nr) |
| 730 | { |
| 731 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
Akinobu Mita | 24097d1 | 2008-04-28 02:16:01 -0700 | [diff] [blame] | 732 | unsigned long bg, first_meta_bg; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 733 | int has_super = 0; |
| 734 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 735 | first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); |
| 736 | |
| 737 | if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) || |
| 738 | nr < first_meta_bg) |
| 739 | return (logic_sb_block + nr + 1); |
| 740 | bg = sbi->s_desc_per_block * nr; |
| 741 | if (ext2_bg_has_super(sb, bg)) |
| 742 | has_super = 1; |
Akinobu Mita | 24097d1 | 2008-04-28 02:16:01 -0700 | [diff] [blame] | 743 | |
| 744 | return ext2_group_first_block_no(sb, bg) + has_super; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 745 | } |
| 746 | |
| 747 | static int ext2_fill_super(struct super_block *sb, void *data, int silent) |
| 748 | { |
| 749 | struct buffer_head * bh; |
| 750 | struct ext2_sb_info * sbi; |
| 751 | struct ext2_super_block * es; |
| 752 | struct inode *root; |
| 753 | unsigned long block; |
| 754 | unsigned long sb_block = get_sb_block(&data); |
| 755 | unsigned long logic_sb_block; |
| 756 | unsigned long offset = 0; |
| 757 | unsigned long def_mount_opts; |
David Howells | 52fcf70 | 2008-02-07 00:15:35 -0800 | [diff] [blame] | 758 | long ret = -EINVAL; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 759 | int blocksize = BLOCK_SIZE; |
| 760 | int db_count; |
| 761 | int i, j; |
| 762 | __le32 features; |
Peter Zijlstra | 833f407 | 2007-10-16 23:25:45 -0700 | [diff] [blame] | 763 | int err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 764 | |
Panagiotis Issaris | f8314dc | 2006-09-27 01:49:37 -0700 | [diff] [blame] | 765 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 766 | if (!sbi) |
| 767 | return -ENOMEM; |
Pekka J Enberg | 18a82eb | 2009-01-07 18:07:19 -0800 | [diff] [blame] | 768 | |
| 769 | sbi->s_blockgroup_lock = |
| 770 | kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); |
| 771 | if (!sbi->s_blockgroup_lock) { |
| 772 | kfree(sbi); |
| 773 | return -ENOMEM; |
| 774 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 775 | sb->s_fs_info = sbi; |
Miklos Szeredi | 93d44cb | 2007-10-16 23:26:26 -0700 | [diff] [blame] | 776 | sbi->s_sb_block = sb_block; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 777 | |
Jan Blunck | c15271f | 2010-04-14 14:38:38 +0200 | [diff] [blame^] | 778 | spin_lock_init(&sbi->s_lock); |
| 779 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 780 | /* |
| 781 | * See what the current blocksize for the device is, and |
| 782 | * use that as the blocksize. Otherwise (or if the blocksize |
| 783 | * is smaller than the default) use the default. |
| 784 | * This is important for devices that have a hardware |
| 785 | * sectorsize that is larger than the default. |
| 786 | */ |
| 787 | blocksize = sb_min_blocksize(sb, BLOCK_SIZE); |
| 788 | if (!blocksize) { |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 789 | ext2_msg(sb, KERN_ERR, "error: unable to set blocksize"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 790 | goto failed_sbi; |
| 791 | } |
| 792 | |
| 793 | /* |
| 794 | * If the superblock doesn't start on a hardware sector boundary, |
| 795 | * calculate the offset. |
| 796 | */ |
| 797 | if (blocksize != BLOCK_SIZE) { |
| 798 | logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; |
| 799 | offset = (sb_block*BLOCK_SIZE) % blocksize; |
| 800 | } else { |
| 801 | logic_sb_block = sb_block; |
| 802 | } |
| 803 | |
| 804 | if (!(bh = sb_bread(sb, logic_sb_block))) { |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 805 | ext2_msg(sb, KERN_ERR, "error: unable to read superblock"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 806 | goto failed_sbi; |
| 807 | } |
| 808 | /* |
| 809 | * Note: s_es must be initialized as soon as possible because |
| 810 | * some ext2 macro-instructions depend on its value |
| 811 | */ |
| 812 | es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); |
| 813 | sbi->s_es = es; |
| 814 | sb->s_magic = le16_to_cpu(es->s_magic); |
| 815 | |
| 816 | if (sb->s_magic != EXT2_SUPER_MAGIC) |
| 817 | goto cantfind_ext2; |
| 818 | |
| 819 | /* Set defaults before we parse the mount options */ |
| 820 | def_mount_opts = le32_to_cpu(es->s_default_mount_opts); |
| 821 | if (def_mount_opts & EXT2_DEFM_DEBUG) |
| 822 | set_opt(sbi->s_mount_opt, DEBUG); |
| 823 | if (def_mount_opts & EXT2_DEFM_BSDGROUPS) |
| 824 | set_opt(sbi->s_mount_opt, GRPID); |
| 825 | if (def_mount_opts & EXT2_DEFM_UID16) |
| 826 | set_opt(sbi->s_mount_opt, NO_UID32); |
Hugh Dickins | 2e7842b | 2007-02-10 01:46:13 -0800 | [diff] [blame] | 827 | #ifdef CONFIG_EXT2_FS_XATTR |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 828 | if (def_mount_opts & EXT2_DEFM_XATTR_USER) |
| 829 | set_opt(sbi->s_mount_opt, XATTR_USER); |
Hugh Dickins | 2e7842b | 2007-02-10 01:46:13 -0800 | [diff] [blame] | 830 | #endif |
| 831 | #ifdef CONFIG_EXT2_FS_POSIX_ACL |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 832 | if (def_mount_opts & EXT2_DEFM_ACL) |
| 833 | set_opt(sbi->s_mount_opt, POSIX_ACL); |
Hugh Dickins | 2e7842b | 2007-02-10 01:46:13 -0800 | [diff] [blame] | 834 | #endif |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 835 | |
| 836 | if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC) |
| 837 | set_opt(sbi->s_mount_opt, ERRORS_PANIC); |
Aneesh Kumar K.V | 14e11e1 | 2008-02-06 01:36:17 -0800 | [diff] [blame] | 838 | 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] | 839 | set_opt(sbi->s_mount_opt, ERRORS_CONT); |
Aneesh Kumar K.V | 14e11e1 | 2008-02-06 01:36:17 -0800 | [diff] [blame] | 840 | else |
| 841 | set_opt(sbi->s_mount_opt, ERRORS_RO); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 842 | |
| 843 | sbi->s_resuid = le16_to_cpu(es->s_def_resuid); |
| 844 | sbi->s_resgid = le16_to_cpu(es->s_def_resgid); |
| 845 | |
Martin J. Bligh | a686cd8 | 2007-10-16 23:30:46 -0700 | [diff] [blame] | 846 | set_opt(sbi->s_mount_opt, RESERVATION); |
| 847 | |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 848 | if (!parse_options((char *) data, sb)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 849 | goto failed_mount; |
| 850 | |
| 851 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | |
| 852 | ((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? |
| 853 | MS_POSIXACL : 0); |
| 854 | |
Carsten Otte | 6d79125 | 2005-06-23 22:05:26 -0700 | [diff] [blame] | 855 | ext2_xip_verify_sb(sb); /* see if bdev supports xip, unset |
| 856 | EXT2_MOUNT_XIP if not */ |
| 857 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 858 | if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV && |
| 859 | (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) || |
| 860 | EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) || |
| 861 | EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U))) |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 862 | ext2_msg(sb, KERN_WARNING, |
| 863 | "warning: feature flags set on rev 0 fs, " |
| 864 | "running e2fsck is recommended"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 865 | /* |
| 866 | * Check feature flags regardless of the revision level, since we |
| 867 | * previously didn't change the revision level when setting the flags, |
| 868 | * so there is a chance incompat flags are set on a rev 0 filesystem. |
| 869 | */ |
| 870 | features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP); |
| 871 | if (features) { |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 872 | ext2_msg(sb, KERN_ERR, "error: couldn't mount because of " |
| 873 | "unsupported optional features (%x)", |
| 874 | le32_to_cpu(features)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 875 | goto failed_mount; |
| 876 | } |
| 877 | if (!(sb->s_flags & MS_RDONLY) && |
| 878 | (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){ |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 879 | ext2_msg(sb, KERN_ERR, "error: couldn't mount RDWR because of " |
| 880 | "unsupported optional features (%x)", |
| 881 | le32_to_cpu(features)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 882 | goto failed_mount; |
| 883 | } |
| 884 | |
| 885 | blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size); |
| 886 | |
Nick Piggin | a8e3eff | 2008-02-06 01:37:42 -0800 | [diff] [blame] | 887 | if (ext2_use_xip(sb) && blocksize != PAGE_SIZE) { |
Carsten Otte | 6d79125 | 2005-06-23 22:05:26 -0700 | [diff] [blame] | 888 | if (!silent) |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 889 | ext2_msg(sb, KERN_ERR, |
| 890 | "error: unsupported blocksize for xip"); |
Carsten Otte | 6d79125 | 2005-06-23 22:05:26 -0700 | [diff] [blame] | 891 | goto failed_mount; |
| 892 | } |
| 893 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 894 | /* If the blocksize doesn't match, re-read the thing.. */ |
| 895 | if (sb->s_blocksize != blocksize) { |
| 896 | brelse(bh); |
| 897 | |
| 898 | if (!sb_set_blocksize(sb, blocksize)) { |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 899 | ext2_msg(sb, KERN_ERR, "error: blocksize is too small"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 900 | goto failed_sbi; |
| 901 | } |
| 902 | |
| 903 | logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; |
| 904 | offset = (sb_block*BLOCK_SIZE) % blocksize; |
| 905 | bh = sb_bread(sb, logic_sb_block); |
| 906 | if(!bh) { |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 907 | ext2_msg(sb, KERN_ERR, "error: couldn't read" |
| 908 | "superblock on 2nd try"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 909 | goto failed_sbi; |
| 910 | } |
| 911 | es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); |
| 912 | sbi->s_es = es; |
| 913 | if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) { |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 914 | ext2_msg(sb, KERN_ERR, "error: magic mismatch"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 915 | goto failed_mount; |
| 916 | } |
| 917 | } |
| 918 | |
| 919 | sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits); |
| 920 | |
| 921 | if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) { |
| 922 | sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE; |
| 923 | sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO; |
| 924 | } else { |
| 925 | sbi->s_inode_size = le16_to_cpu(es->s_inode_size); |
| 926 | sbi->s_first_ino = le32_to_cpu(es->s_first_ino); |
| 927 | if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) || |
vignesh babu | d8ea6cf | 2007-10-16 23:27:14 -0700 | [diff] [blame] | 928 | !is_power_of_2(sbi->s_inode_size) || |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 929 | (sbi->s_inode_size > blocksize)) { |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 930 | ext2_msg(sb, KERN_ERR, |
| 931 | "error: unsupported inode size: %d", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 932 | sbi->s_inode_size); |
| 933 | goto failed_mount; |
| 934 | } |
| 935 | } |
| 936 | |
| 937 | sbi->s_frag_size = EXT2_MIN_FRAG_SIZE << |
| 938 | le32_to_cpu(es->s_log_frag_size); |
| 939 | if (sbi->s_frag_size == 0) |
| 940 | goto cantfind_ext2; |
| 941 | sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size; |
| 942 | |
| 943 | sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); |
| 944 | sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); |
| 945 | sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); |
| 946 | |
| 947 | if (EXT2_INODE_SIZE(sb) == 0) |
| 948 | goto cantfind_ext2; |
| 949 | sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb); |
Andries Brouwer | 607eb26 | 2006-08-27 01:23:43 -0700 | [diff] [blame] | 950 | 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] | 951 | goto cantfind_ext2; |
| 952 | sbi->s_itb_per_group = sbi->s_inodes_per_group / |
| 953 | sbi->s_inodes_per_block; |
| 954 | sbi->s_desc_per_block = sb->s_blocksize / |
| 955 | sizeof (struct ext2_group_desc); |
| 956 | sbi->s_sbh = bh; |
| 957 | sbi->s_mount_state = le16_to_cpu(es->s_state); |
| 958 | sbi->s_addr_per_block_bits = |
David Howells | f0d1b0b | 2006-12-08 02:37:49 -0800 | [diff] [blame] | 959 | ilog2 (EXT2_ADDR_PER_BLOCK(sb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 960 | sbi->s_desc_per_block_bits = |
David Howells | f0d1b0b | 2006-12-08 02:37:49 -0800 | [diff] [blame] | 961 | ilog2 (EXT2_DESC_PER_BLOCK(sb)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 962 | |
| 963 | if (sb->s_magic != EXT2_SUPER_MAGIC) |
| 964 | goto cantfind_ext2; |
| 965 | |
| 966 | if (sb->s_blocksize != bh->b_size) { |
| 967 | if (!silent) |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 968 | ext2_msg(sb, KERN_ERR, "error: unsupported blocksize"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 969 | goto failed_mount; |
| 970 | } |
| 971 | |
| 972 | if (sb->s_blocksize != sbi->s_frag_size) { |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 973 | ext2_msg(sb, KERN_ERR, |
| 974 | "error: fragsize %lu != blocksize %lu" |
| 975 | "(not supported yet)", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 976 | sbi->s_frag_size, sb->s_blocksize); |
| 977 | goto failed_mount; |
| 978 | } |
| 979 | |
| 980 | if (sbi->s_blocks_per_group > sb->s_blocksize * 8) { |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 981 | ext2_msg(sb, KERN_ERR, |
| 982 | "error: #blocks per group too big: %lu", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 983 | sbi->s_blocks_per_group); |
| 984 | goto failed_mount; |
| 985 | } |
| 986 | if (sbi->s_frags_per_group > sb->s_blocksize * 8) { |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 987 | ext2_msg(sb, KERN_ERR, |
| 988 | "error: #fragments per group too big: %lu", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 989 | sbi->s_frags_per_group); |
| 990 | goto failed_mount; |
| 991 | } |
| 992 | if (sbi->s_inodes_per_group > sb->s_blocksize * 8) { |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 993 | ext2_msg(sb, KERN_ERR, |
| 994 | "error: #inodes per group too big: %lu", |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 995 | sbi->s_inodes_per_group); |
| 996 | goto failed_mount; |
| 997 | } |
| 998 | |
| 999 | if (EXT2_BLOCKS_PER_GROUP(sb) == 0) |
| 1000 | goto cantfind_ext2; |
Eric Sandeen | 41f04d8 | 2006-09-27 01:49:30 -0700 | [diff] [blame] | 1001 | sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) - |
| 1002 | le32_to_cpu(es->s_first_data_block) - 1) |
| 1003 | / EXT2_BLOCKS_PER_GROUP(sb)) + 1; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1004 | db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) / |
| 1005 | EXT2_DESC_PER_BLOCK(sb); |
| 1006 | sbi->s_group_desc = kmalloc (db_count * sizeof (struct buffer_head *), GFP_KERNEL); |
| 1007 | if (sbi->s_group_desc == NULL) { |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 1008 | ext2_msg(sb, KERN_ERR, "error: not enough memory"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1009 | goto failed_mount; |
| 1010 | } |
Pekka J Enberg | 18a82eb | 2009-01-07 18:07:19 -0800 | [diff] [blame] | 1011 | bgl_lock_init(sbi->s_blockgroup_lock); |
Yoann Padioleau | dd00cc4 | 2007-07-19 01:49:03 -0700 | [diff] [blame] | 1012 | 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] | 1013 | if (!sbi->s_debts) { |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 1014 | ext2_msg(sb, KERN_ERR, "error: not enough memory"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1015 | goto failed_mount_group_desc; |
| 1016 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1017 | for (i = 0; i < db_count; i++) { |
| 1018 | block = descriptor_loc(sb, logic_sb_block, i); |
| 1019 | sbi->s_group_desc[i] = sb_bread(sb, block); |
| 1020 | if (!sbi->s_group_desc[i]) { |
| 1021 | for (j = 0; j < i; j++) |
| 1022 | brelse (sbi->s_group_desc[j]); |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 1023 | ext2_msg(sb, KERN_ERR, |
| 1024 | "error: unable to read group descriptors"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1025 | goto failed_mount_group_desc; |
| 1026 | } |
| 1027 | } |
| 1028 | if (!ext2_check_descriptors (sb)) { |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 1029 | ext2_msg(sb, KERN_ERR, "group descriptors corrupted"); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1030 | goto failed_mount2; |
| 1031 | } |
| 1032 | sbi->s_gdb_count = db_count; |
| 1033 | get_random_bytes(&sbi->s_next_generation, sizeof(u32)); |
| 1034 | spin_lock_init(&sbi->s_next_gen_lock); |
Mingming Cao | 0216bfc | 2006-06-23 02:05:41 -0700 | [diff] [blame] | 1035 | |
Martin J. Bligh | a686cd8 | 2007-10-16 23:30:46 -0700 | [diff] [blame] | 1036 | /* per fileystem reservation list head & lock */ |
| 1037 | spin_lock_init(&sbi->s_rsv_window_lock); |
| 1038 | sbi->s_rsv_window_root = RB_ROOT; |
| 1039 | /* |
| 1040 | * Add a single, static dummy reservation to the start of the |
| 1041 | * reservation window list --- it gives us a placeholder for |
| 1042 | * append-at-start-of-list which makes the allocation logic |
| 1043 | * _much_ simpler. |
| 1044 | */ |
| 1045 | sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; |
| 1046 | sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; |
| 1047 | sbi->s_rsv_window_head.rsv_alloc_hit = 0; |
| 1048 | sbi->s_rsv_window_head.rsv_goal_size = 0; |
| 1049 | ext2_rsv_window_add(sb, &sbi->s_rsv_window_head); |
| 1050 | |
Peter Zijlstra | 833f407 | 2007-10-16 23:25:45 -0700 | [diff] [blame] | 1051 | err = percpu_counter_init(&sbi->s_freeblocks_counter, |
Mingming Cao | 0216bfc | 2006-06-23 02:05:41 -0700 | [diff] [blame] | 1052 | ext2_count_free_blocks(sb)); |
Peter Zijlstra | 833f407 | 2007-10-16 23:25:45 -0700 | [diff] [blame] | 1053 | if (!err) { |
| 1054 | err = percpu_counter_init(&sbi->s_freeinodes_counter, |
Mingming Cao | 0216bfc | 2006-06-23 02:05:41 -0700 | [diff] [blame] | 1055 | ext2_count_free_inodes(sb)); |
Peter Zijlstra | 833f407 | 2007-10-16 23:25:45 -0700 | [diff] [blame] | 1056 | } |
| 1057 | if (!err) { |
| 1058 | err = percpu_counter_init(&sbi->s_dirs_counter, |
Mingming Cao | 0216bfc | 2006-06-23 02:05:41 -0700 | [diff] [blame] | 1059 | ext2_count_dirs(sb)); |
Peter Zijlstra | 833f407 | 2007-10-16 23:25:45 -0700 | [diff] [blame] | 1060 | } |
| 1061 | if (err) { |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 1062 | ext2_msg(sb, KERN_ERR, "error: insufficient memory"); |
Peter Zijlstra | 833f407 | 2007-10-16 23:25:45 -0700 | [diff] [blame] | 1063 | goto failed_mount3; |
| 1064 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1065 | /* |
| 1066 | * set up enough so that it can read an inode |
| 1067 | */ |
| 1068 | sb->s_op = &ext2_sops; |
| 1069 | sb->s_export_op = &ext2_export_ops; |
| 1070 | sb->s_xattr = ext2_xattr_handlers; |
David Howells | 52fcf70 | 2008-02-07 00:15:35 -0800 | [diff] [blame] | 1071 | root = ext2_iget(sb, EXT2_ROOT_INO); |
| 1072 | if (IS_ERR(root)) { |
| 1073 | ret = PTR_ERR(root); |
| 1074 | goto failed_mount3; |
| 1075 | } |
| 1076 | if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { |
| 1077 | iput(root); |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 1078 | ext2_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck"); |
David Howells | 52fcf70 | 2008-02-07 00:15:35 -0800 | [diff] [blame] | 1079 | goto failed_mount3; |
| 1080 | } |
| 1081 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1082 | sb->s_root = d_alloc_root(root); |
| 1083 | if (!sb->s_root) { |
| 1084 | iput(root); |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 1085 | ext2_msg(sb, KERN_ERR, "error: get root inode failed"); |
David Howells | 52fcf70 | 2008-02-07 00:15:35 -0800 | [diff] [blame] | 1086 | ret = -ENOMEM; |
Mingming Cao | 0216bfc | 2006-06-23 02:05:41 -0700 | [diff] [blame] | 1087 | goto failed_mount3; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1088 | } |
| 1089 | if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 1090 | ext2_msg(sb, KERN_WARNING, |
| 1091 | "warning: mounting ext3 filesystem as ext2"); |
Jan Blunck | 4c96a68 | 2010-04-14 14:38:37 +0200 | [diff] [blame] | 1092 | if (ext2_setup_super (sb, es, sb->s_flags & MS_RDONLY)) |
| 1093 | sb->s_flags |= MS_RDONLY; |
| 1094 | ext2_write_super(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1095 | return 0; |
| 1096 | |
| 1097 | cantfind_ext2: |
| 1098 | if (!silent) |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 1099 | ext2_msg(sb, KERN_ERR, |
| 1100 | "error: can't find an ext2 filesystem on dev %s.", |
| 1101 | sb->s_id); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1102 | goto failed_mount; |
Mingming Cao | 0216bfc | 2006-06-23 02:05:41 -0700 | [diff] [blame] | 1103 | failed_mount3: |
| 1104 | percpu_counter_destroy(&sbi->s_freeblocks_counter); |
| 1105 | percpu_counter_destroy(&sbi->s_freeinodes_counter); |
| 1106 | percpu_counter_destroy(&sbi->s_dirs_counter); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1107 | failed_mount2: |
| 1108 | for (i = 0; i < db_count; i++) |
| 1109 | brelse(sbi->s_group_desc[i]); |
| 1110 | failed_mount_group_desc: |
| 1111 | kfree(sbi->s_group_desc); |
| 1112 | kfree(sbi->s_debts); |
| 1113 | failed_mount: |
| 1114 | brelse(bh); |
| 1115 | failed_sbi: |
| 1116 | sb->s_fs_info = NULL; |
Manish Katiyar | 0f7ee7c | 2009-05-17 23:52:51 -0400 | [diff] [blame] | 1117 | kfree(sbi->s_blockgroup_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1118 | kfree(sbi); |
David Howells | 52fcf70 | 2008-02-07 00:15:35 -0800 | [diff] [blame] | 1119 | return ret; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1120 | } |
| 1121 | |
Theodore Ts'o | 7bf0dc9 | 2009-12-15 16:46:48 -0800 | [diff] [blame] | 1122 | static void ext2_clear_super_error(struct super_block *sb) |
| 1123 | { |
| 1124 | struct buffer_head *sbh = EXT2_SB(sb)->s_sbh; |
| 1125 | |
| 1126 | if (buffer_write_io_error(sbh)) { |
| 1127 | /* |
| 1128 | * Oh, dear. A previous attempt to write the |
| 1129 | * superblock failed. This could happen because the |
| 1130 | * USB device was yanked out. Or it could happen to |
| 1131 | * be a transient write error and maybe the block will |
| 1132 | * be remapped. Nothing we can do but to retry the |
| 1133 | * write and hope for the best. |
| 1134 | */ |
Jan Blunck | 2b8120e | 2010-04-14 14:38:33 +0200 | [diff] [blame] | 1135 | ext2_msg(sb, KERN_ERR, |
| 1136 | "previous I/O error to superblock detected\n"); |
Theodore Ts'o | 7bf0dc9 | 2009-12-15 16:46:48 -0800 | [diff] [blame] | 1137 | clear_buffer_write_io_error(sbh); |
| 1138 | set_buffer_uptodate(sbh); |
| 1139 | } |
| 1140 | } |
| 1141 | |
Jan Blunck | ee6921e | 2010-04-14 14:38:36 +0200 | [diff] [blame] | 1142 | static void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es, |
| 1143 | int wait) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1144 | { |
Theodore Ts'o | 7bf0dc9 | 2009-12-15 16:46:48 -0800 | [diff] [blame] | 1145 | ext2_clear_super_error(sb); |
Jan Blunck | c15271f | 2010-04-14 14:38:38 +0200 | [diff] [blame^] | 1146 | spin_lock(&EXT2_SB(sb)->s_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1147 | es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb)); |
| 1148 | es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb)); |
| 1149 | es->s_wtime = cpu_to_le32(get_seconds()); |
Jan Blunck | c15271f | 2010-04-14 14:38:38 +0200 | [diff] [blame^] | 1150 | /* unlock before we do IO */ |
| 1151 | spin_unlock(&EXT2_SB(sb)->s_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1152 | mark_buffer_dirty(EXT2_SB(sb)->s_sbh); |
Jan Blunck | ee6921e | 2010-04-14 14:38:36 +0200 | [diff] [blame] | 1153 | if (wait) |
| 1154 | sync_dirty_buffer(EXT2_SB(sb)->s_sbh); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1155 | sb->s_dirt = 0; |
| 1156 | } |
| 1157 | |
| 1158 | /* |
| 1159 | * In the second extended file system, it is not necessary to |
| 1160 | * write the super block since we use a mapping of the |
| 1161 | * disk super block in a buffer. |
| 1162 | * |
| 1163 | * However, this function is still used to set the fs valid |
| 1164 | * flags to 0. We need to set this flag to 0 since the fs |
| 1165 | * may have been checked while mounted and e2fsck may have |
| 1166 | * set s_state to EXT2_VALID_FS after some corrections. |
| 1167 | */ |
Christoph Hellwig | 40f31dd | 2009-06-08 10:04:17 +0200 | [diff] [blame] | 1168 | static int ext2_sync_fs(struct super_block *sb, int wait) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1169 | { |
Jan Blunck | c15271f | 2010-04-14 14:38:38 +0200 | [diff] [blame^] | 1170 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
Christoph Hellwig | 40f31dd | 2009-06-08 10:04:17 +0200 | [diff] [blame] | 1171 | struct ext2_super_block *es = EXT2_SB(sb)->s_es; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1172 | |
Christoph Hellwig | 40f31dd | 2009-06-08 10:04:17 +0200 | [diff] [blame] | 1173 | lock_kernel(); |
Jan Blunck | c15271f | 2010-04-14 14:38:38 +0200 | [diff] [blame^] | 1174 | spin_lock(&sbi->s_lock); |
Christoph Hellwig | 40f31dd | 2009-06-08 10:04:17 +0200 | [diff] [blame] | 1175 | if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) { |
| 1176 | ext2_debug("setting valid to 0\n"); |
| 1177 | es->s_state &= cpu_to_le16(~EXT2_VALID_FS); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1178 | } |
Jan Blunck | c15271f | 2010-04-14 14:38:38 +0200 | [diff] [blame^] | 1179 | spin_unlock(&sbi->s_lock); |
Jan Blunck | ee6921e | 2010-04-14 14:38:36 +0200 | [diff] [blame] | 1180 | ext2_sync_super(sb, es, wait); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1181 | unlock_kernel(); |
Christoph Hellwig | 40f31dd | 2009-06-08 10:04:17 +0200 | [diff] [blame] | 1182 | |
| 1183 | return 0; |
| 1184 | } |
| 1185 | |
| 1186 | |
| 1187 | void ext2_write_super(struct super_block *sb) |
| 1188 | { |
| 1189 | if (!(sb->s_flags & MS_RDONLY)) |
| 1190 | ext2_sync_fs(sb, 1); |
| 1191 | else |
| 1192 | sb->s_dirt = 0; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1193 | } |
| 1194 | |
| 1195 | static int ext2_remount (struct super_block * sb, int * flags, char * data) |
| 1196 | { |
| 1197 | struct ext2_sb_info * sbi = EXT2_SB(sb); |
| 1198 | struct ext2_super_block * es; |
Carsten Otte | 6d79125 | 2005-06-23 22:05:26 -0700 | [diff] [blame] | 1199 | unsigned long old_mount_opt = sbi->s_mount_opt; |
Jan Kara | 50a5223 | 2005-07-12 13:58:29 -0700 | [diff] [blame] | 1200 | struct ext2_mount_options old_opts; |
| 1201 | unsigned long old_sb_flags; |
| 1202 | int err; |
| 1203 | |
Alessio Igor Bogani | 337eb00 | 2009-05-12 15:10:54 +0200 | [diff] [blame] | 1204 | lock_kernel(); |
Jan Blunck | c15271f | 2010-04-14 14:38:38 +0200 | [diff] [blame^] | 1205 | spin_lock(&sbi->s_lock); |
Alessio Igor Bogani | 337eb00 | 2009-05-12 15:10:54 +0200 | [diff] [blame] | 1206 | |
Jan Kara | 50a5223 | 2005-07-12 13:58:29 -0700 | [diff] [blame] | 1207 | /* Store the old options */ |
| 1208 | old_sb_flags = sb->s_flags; |
| 1209 | old_opts.s_mount_opt = sbi->s_mount_opt; |
| 1210 | old_opts.s_resuid = sbi->s_resuid; |
| 1211 | old_opts.s_resgid = sbi->s_resgid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1212 | |
| 1213 | /* |
| 1214 | * Allow the "check" option to be passed as a remount option. |
| 1215 | */ |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 1216 | if (!parse_options(data, sb)) { |
Jan Kara | 50a5223 | 2005-07-12 13:58:29 -0700 | [diff] [blame] | 1217 | err = -EINVAL; |
| 1218 | goto restore_opts; |
| 1219 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1220 | |
| 1221 | sb->s_flags = (sb->s_flags & ~MS_POSIXACL) | |
| 1222 | ((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? MS_POSIXACL : 0); |
| 1223 | |
Carsten Otte | 266f5aa | 2007-06-23 17:16:46 -0700 | [diff] [blame] | 1224 | ext2_xip_verify_sb(sb); /* see if bdev supports xip, unset |
| 1225 | EXT2_MOUNT_XIP if not */ |
| 1226 | |
| 1227 | if ((ext2_use_xip(sb)) && (sb->s_blocksize != PAGE_SIZE)) { |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 1228 | ext2_msg(sb, KERN_WARNING, |
| 1229 | "warning: unsupported blocksize for xip"); |
Andrew Morton | ddc80bd | 2007-06-27 14:10:08 -0700 | [diff] [blame] | 1230 | err = -EINVAL; |
Carsten Otte | 266f5aa | 2007-06-23 17:16:46 -0700 | [diff] [blame] | 1231 | goto restore_opts; |
| 1232 | } |
| 1233 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1234 | es = sbi->s_es; |
Carsten Otte | 6d79125 | 2005-06-23 22:05:26 -0700 | [diff] [blame] | 1235 | if (((sbi->s_mount_opt & EXT2_MOUNT_XIP) != |
| 1236 | (old_mount_opt & EXT2_MOUNT_XIP)) && |
Carsten Otte | 0e4a9b5 | 2009-02-11 13:04:37 -0800 | [diff] [blame] | 1237 | invalidate_inodes(sb)) { |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 1238 | ext2_msg(sb, KERN_WARNING, "warning: refusing change of " |
| 1239 | "xip flag with busy inodes while remounting"); |
Carsten Otte | 0e4a9b5 | 2009-02-11 13:04:37 -0800 | [diff] [blame] | 1240 | sbi->s_mount_opt &= ~EXT2_MOUNT_XIP; |
| 1241 | sbi->s_mount_opt |= old_mount_opt & EXT2_MOUNT_XIP; |
| 1242 | } |
Alessio Igor Bogani | 337eb00 | 2009-05-12 15:10:54 +0200 | [diff] [blame] | 1243 | if ((*flags & MS_RDONLY) == (sb->s_flags & MS_RDONLY)) { |
Jan Blunck | c15271f | 2010-04-14 14:38:38 +0200 | [diff] [blame^] | 1244 | spin_unlock(&sbi->s_lock); |
Alessio Igor Bogani | 337eb00 | 2009-05-12 15:10:54 +0200 | [diff] [blame] | 1245 | unlock_kernel(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1246 | return 0; |
Alessio Igor Bogani | 337eb00 | 2009-05-12 15:10:54 +0200 | [diff] [blame] | 1247 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1248 | if (*flags & MS_RDONLY) { |
| 1249 | if (le16_to_cpu(es->s_state) & EXT2_VALID_FS || |
Alessio Igor Bogani | 337eb00 | 2009-05-12 15:10:54 +0200 | [diff] [blame] | 1250 | !(sbi->s_mount_state & EXT2_VALID_FS)) { |
Jan Blunck | c15271f | 2010-04-14 14:38:38 +0200 | [diff] [blame^] | 1251 | spin_unlock(&sbi->s_lock); |
Alessio Igor Bogani | 337eb00 | 2009-05-12 15:10:54 +0200 | [diff] [blame] | 1252 | unlock_kernel(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1253 | return 0; |
Alessio Igor Bogani | 337eb00 | 2009-05-12 15:10:54 +0200 | [diff] [blame] | 1254 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1255 | /* |
| 1256 | * OK, we are remounting a valid rw partition rdonly, so set |
| 1257 | * the rdonly flag and then mark the partition as valid again. |
| 1258 | */ |
| 1259 | es->s_state = cpu_to_le16(sbi->s_mount_state); |
| 1260 | es->s_mtime = cpu_to_le32(get_seconds()); |
Jan Blunck | c15271f | 2010-04-14 14:38:38 +0200 | [diff] [blame^] | 1261 | spin_unlock(&sbi->s_lock); |
Jan Blunck | 4c96a68 | 2010-04-14 14:38:37 +0200 | [diff] [blame] | 1262 | ext2_sync_super(sb, es, 1); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1263 | } else { |
| 1264 | __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb, |
| 1265 | ~EXT2_FEATURE_RO_COMPAT_SUPP); |
| 1266 | if (ret) { |
Alexey Fisher | 2314b07 | 2009-11-19 19:12:51 +0100 | [diff] [blame] | 1267 | ext2_msg(sb, KERN_WARNING, |
| 1268 | "warning: couldn't remount RDWR because of " |
| 1269 | "unsupported optional features (%x).", |
| 1270 | le32_to_cpu(ret)); |
Jan Kara | 50a5223 | 2005-07-12 13:58:29 -0700 | [diff] [blame] | 1271 | err = -EROFS; |
| 1272 | goto restore_opts; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1273 | } |
| 1274 | /* |
| 1275 | * Mounting a RDONLY partition read-write, so reread and |
| 1276 | * store the current valid flag. (It may have been changed |
| 1277 | * by e2fsck since we originally mounted the partition.) |
| 1278 | */ |
| 1279 | sbi->s_mount_state = le16_to_cpu(es->s_state); |
| 1280 | if (!ext2_setup_super (sb, es, 0)) |
| 1281 | sb->s_flags &= ~MS_RDONLY; |
Jan Blunck | c15271f | 2010-04-14 14:38:38 +0200 | [diff] [blame^] | 1282 | spin_unlock(&sbi->s_lock); |
Jan Blunck | 4c96a68 | 2010-04-14 14:38:37 +0200 | [diff] [blame] | 1283 | ext2_write_super(sb); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1284 | } |
Alessio Igor Bogani | 337eb00 | 2009-05-12 15:10:54 +0200 | [diff] [blame] | 1285 | unlock_kernel(); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1286 | return 0; |
Jan Kara | 50a5223 | 2005-07-12 13:58:29 -0700 | [diff] [blame] | 1287 | restore_opts: |
| 1288 | sbi->s_mount_opt = old_opts.s_mount_opt; |
| 1289 | sbi->s_resuid = old_opts.s_resuid; |
| 1290 | sbi->s_resgid = old_opts.s_resgid; |
| 1291 | sb->s_flags = old_sb_flags; |
Jan Blunck | c15271f | 2010-04-14 14:38:38 +0200 | [diff] [blame^] | 1292 | spin_unlock(&sbi->s_lock); |
Alessio Igor Bogani | 337eb00 | 2009-05-12 15:10:54 +0200 | [diff] [blame] | 1293 | unlock_kernel(); |
Jan Kara | 50a5223 | 2005-07-12 13:58:29 -0700 | [diff] [blame] | 1294 | return err; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1295 | } |
| 1296 | |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 1297 | static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1298 | { |
David Howells | 726c334 | 2006-06-23 02:02:58 -0700 | [diff] [blame] | 1299 | struct super_block *sb = dentry->d_sb; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1300 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
Pekka Enberg | e4fca01 | 2006-12-06 20:35:27 -0800 | [diff] [blame] | 1301 | struct ext2_super_block *es = sbi->s_es; |
Pekka Enberg | e4fca01 | 2006-12-06 20:35:27 -0800 | [diff] [blame] | 1302 | u64 fsid; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1303 | |
Jan Blunck | c15271f | 2010-04-14 14:38:38 +0200 | [diff] [blame^] | 1304 | spin_lock(&sbi->s_lock); |
| 1305 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1306 | if (test_opt (sb, MINIX_DF)) |
Badari Pulavarty | 2235219 | 2007-07-15 23:41:58 -0700 | [diff] [blame] | 1307 | sbi->s_overhead_last = 0; |
| 1308 | else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) { |
| 1309 | unsigned long i, overhead = 0; |
| 1310 | smp_rmb(); |
| 1311 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1312 | /* |
Badari Pulavarty | 2235219 | 2007-07-15 23:41:58 -0700 | [diff] [blame] | 1313 | * Compute the overhead (FS structures). This is constant |
| 1314 | * for a given filesystem unless the number of block groups |
| 1315 | * changes so we cache the previous value until it does. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1316 | */ |
| 1317 | |
| 1318 | /* |
| 1319 | * All of the blocks before first_data_block are |
| 1320 | * overhead |
| 1321 | */ |
Pekka Enberg | e4fca01 | 2006-12-06 20:35:27 -0800 | [diff] [blame] | 1322 | overhead = le32_to_cpu(es->s_first_data_block); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1323 | |
| 1324 | /* |
| 1325 | * Add the overhead attributed to the superblock and |
| 1326 | * block group descriptors. If the sparse superblocks |
| 1327 | * feature is turned on, then not all groups have this. |
| 1328 | */ |
| 1329 | for (i = 0; i < sbi->s_groups_count; i++) |
| 1330 | overhead += ext2_bg_has_super(sb, i) + |
| 1331 | ext2_bg_num_gdb(sb, i); |
| 1332 | |
| 1333 | /* |
| 1334 | * Every block group has an inode bitmap, a block |
| 1335 | * bitmap, and an inode table. |
| 1336 | */ |
| 1337 | overhead += (sbi->s_groups_count * |
| 1338 | (2 + sbi->s_itb_per_group)); |
Badari Pulavarty | 2235219 | 2007-07-15 23:41:58 -0700 | [diff] [blame] | 1339 | sbi->s_overhead_last = overhead; |
| 1340 | smp_wmb(); |
| 1341 | sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1342 | } |
| 1343 | |
| 1344 | buf->f_type = EXT2_SUPER_MAGIC; |
| 1345 | buf->f_bsize = sb->s_blocksize; |
Badari Pulavarty | 2235219 | 2007-07-15 23:41:58 -0700 | [diff] [blame] | 1346 | 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] | 1347 | buf->f_bfree = ext2_count_free_blocks(sb); |
Badari Pulavarty | 2235219 | 2007-07-15 23:41:58 -0700 | [diff] [blame] | 1348 | es->s_free_blocks_count = cpu_to_le32(buf->f_bfree); |
Pekka Enberg | e4fca01 | 2006-12-06 20:35:27 -0800 | [diff] [blame] | 1349 | buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count); |
| 1350 | if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count)) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1351 | buf->f_bavail = 0; |
Pekka Enberg | e4fca01 | 2006-12-06 20:35:27 -0800 | [diff] [blame] | 1352 | buf->f_files = le32_to_cpu(es->s_inodes_count); |
| 1353 | buf->f_ffree = ext2_count_free_inodes(sb); |
Badari Pulavarty | 2235219 | 2007-07-15 23:41:58 -0700 | [diff] [blame] | 1354 | es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1355 | buf->f_namelen = EXT2_NAME_LEN; |
Pekka Enberg | e4fca01 | 2006-12-06 20:35:27 -0800 | [diff] [blame] | 1356 | fsid = le64_to_cpup((void *)es->s_uuid) ^ |
| 1357 | le64_to_cpup((void *)es->s_uuid + sizeof(u64)); |
| 1358 | buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; |
| 1359 | buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; |
Jan Blunck | c15271f | 2010-04-14 14:38:38 +0200 | [diff] [blame^] | 1360 | spin_unlock(&sbi->s_lock); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1361 | return 0; |
| 1362 | } |
| 1363 | |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 1364 | static int ext2_get_sb(struct file_system_type *fs_type, |
| 1365 | int flags, const char *dev_name, void *data, struct vfsmount *mnt) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1366 | { |
David Howells | 454e239 | 2006-06-23 02:02:57 -0700 | [diff] [blame] | 1367 | 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] | 1368 | } |
| 1369 | |
| 1370 | #ifdef CONFIG_QUOTA |
| 1371 | |
| 1372 | /* Read data from quotafile - avoid pagecache and such because we cannot afford |
| 1373 | * acquiring the locks... As quota files are never truncated and quota code |
| 1374 | * itself serializes the operations (and noone else should touch the files) |
| 1375 | * we don't have to be afraid of races */ |
| 1376 | static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, |
| 1377 | size_t len, loff_t off) |
| 1378 | { |
| 1379 | struct inode *inode = sb_dqopt(sb)->files[type]; |
| 1380 | sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); |
| 1381 | int err = 0; |
| 1382 | int offset = off & (sb->s_blocksize - 1); |
| 1383 | int tocopy; |
| 1384 | size_t toread; |
| 1385 | struct buffer_head tmp_bh; |
| 1386 | struct buffer_head *bh; |
| 1387 | loff_t i_size = i_size_read(inode); |
| 1388 | |
| 1389 | if (off > i_size) |
| 1390 | return 0; |
| 1391 | if (off+len > i_size) |
| 1392 | len = i_size-off; |
| 1393 | toread = len; |
| 1394 | while (toread > 0) { |
| 1395 | tocopy = sb->s_blocksize - offset < toread ? |
| 1396 | sb->s_blocksize - offset : toread; |
| 1397 | |
| 1398 | tmp_bh.b_state = 0; |
Manish Katiyar | c16831b | 2009-02-12 21:57:04 +0100 | [diff] [blame] | 1399 | tmp_bh.b_size = sb->s_blocksize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1400 | err = ext2_get_block(inode, blk, &tmp_bh, 0); |
Martin J. Bligh | a686cd8 | 2007-10-16 23:30:46 -0700 | [diff] [blame] | 1401 | if (err < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1402 | return err; |
| 1403 | if (!buffer_mapped(&tmp_bh)) /* A hole? */ |
| 1404 | memset(data, 0, tocopy); |
| 1405 | else { |
| 1406 | bh = sb_bread(sb, tmp_bh.b_blocknr); |
| 1407 | if (!bh) |
| 1408 | return -EIO; |
| 1409 | memcpy(data, bh->b_data+offset, tocopy); |
| 1410 | brelse(bh); |
| 1411 | } |
| 1412 | offset = 0; |
| 1413 | toread -= tocopy; |
| 1414 | data += tocopy; |
| 1415 | blk++; |
| 1416 | } |
| 1417 | return len; |
| 1418 | } |
| 1419 | |
| 1420 | /* Write to quotafile */ |
| 1421 | static ssize_t ext2_quota_write(struct super_block *sb, int type, |
| 1422 | const char *data, size_t len, loff_t off) |
| 1423 | { |
| 1424 | struct inode *inode = sb_dqopt(sb)->files[type]; |
| 1425 | sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); |
| 1426 | int err = 0; |
| 1427 | int offset = off & (sb->s_blocksize - 1); |
| 1428 | int tocopy; |
| 1429 | size_t towrite = len; |
| 1430 | struct buffer_head tmp_bh; |
| 1431 | struct buffer_head *bh; |
| 1432 | |
Arjan van de Ven | 5c81a41 | 2006-07-03 00:25:20 -0700 | [diff] [blame] | 1433 | mutex_lock_nested(&inode->i_mutex, I_MUTEX_QUOTA); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1434 | while (towrite > 0) { |
| 1435 | tocopy = sb->s_blocksize - offset < towrite ? |
| 1436 | sb->s_blocksize - offset : towrite; |
| 1437 | |
| 1438 | tmp_bh.b_state = 0; |
| 1439 | err = ext2_get_block(inode, blk, &tmp_bh, 1); |
Martin J. Bligh | a686cd8 | 2007-10-16 23:30:46 -0700 | [diff] [blame] | 1440 | if (err < 0) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1441 | goto out; |
| 1442 | if (offset || tocopy != EXT2_BLOCK_SIZE(sb)) |
| 1443 | bh = sb_bread(sb, tmp_bh.b_blocknr); |
| 1444 | else |
| 1445 | bh = sb_getblk(sb, tmp_bh.b_blocknr); |
| 1446 | if (!bh) { |
| 1447 | err = -EIO; |
| 1448 | goto out; |
| 1449 | } |
| 1450 | lock_buffer(bh); |
| 1451 | memcpy(bh->b_data+offset, data, tocopy); |
| 1452 | flush_dcache_page(bh->b_page); |
| 1453 | set_buffer_uptodate(bh); |
| 1454 | mark_buffer_dirty(bh); |
| 1455 | unlock_buffer(bh); |
| 1456 | brelse(bh); |
| 1457 | offset = 0; |
| 1458 | towrite -= tocopy; |
| 1459 | data += tocopy; |
| 1460 | blk++; |
| 1461 | } |
| 1462 | out: |
Dan Carpenter | a069e9c | 2009-04-09 18:07:10 +0200 | [diff] [blame] | 1463 | if (len == towrite) { |
| 1464 | mutex_unlock(&inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1465 | return err; |
Dan Carpenter | a069e9c | 2009-04-09 18:07:10 +0200 | [diff] [blame] | 1466 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1467 | if (inode->i_size < off+len-towrite) |
| 1468 | i_size_write(inode, off+len-towrite); |
| 1469 | inode->i_version++; |
| 1470 | inode->i_mtime = inode->i_ctime = CURRENT_TIME; |
| 1471 | mark_inode_dirty(inode); |
Jes Sorensen | 1b1dcc1 | 2006-01-09 15:59:24 -0800 | [diff] [blame] | 1472 | mutex_unlock(&inode->i_mutex); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1473 | return len - towrite; |
| 1474 | } |
| 1475 | |
| 1476 | #endif |
| 1477 | |
| 1478 | static struct file_system_type ext2_fs_type = { |
| 1479 | .owner = THIS_MODULE, |
| 1480 | .name = "ext2", |
| 1481 | .get_sb = ext2_get_sb, |
| 1482 | .kill_sb = kill_block_super, |
| 1483 | .fs_flags = FS_REQUIRES_DEV, |
| 1484 | }; |
| 1485 | |
| 1486 | static int __init init_ext2_fs(void) |
| 1487 | { |
| 1488 | int err = init_ext2_xattr(); |
| 1489 | if (err) |
| 1490 | return err; |
| 1491 | err = init_inodecache(); |
| 1492 | if (err) |
| 1493 | goto out1; |
| 1494 | err = register_filesystem(&ext2_fs_type); |
| 1495 | if (err) |
| 1496 | goto out; |
| 1497 | return 0; |
| 1498 | out: |
| 1499 | destroy_inodecache(); |
| 1500 | out1: |
| 1501 | exit_ext2_xattr(); |
| 1502 | return err; |
| 1503 | } |
| 1504 | |
| 1505 | static void __exit exit_ext2_fs(void) |
| 1506 | { |
| 1507 | unregister_filesystem(&ext2_fs_type); |
| 1508 | destroy_inodecache(); |
| 1509 | exit_ext2_xattr(); |
| 1510 | } |
| 1511 | |
| 1512 | module_init(init_ext2_fs) |
| 1513 | module_exit(exit_ext2_fs) |