| 1 | // SPDX-License-Identifier: GPL-2.0-only |
| 2 | /* |
| 3 | * linux/fs/ext2/super.c |
| 4 | * |
| 5 | * Copyright (C) 1992, 1993, 1994, 1995 |
| 6 | * Remy Card (card@masi.ibp.fr) |
| 7 | * Laboratoire MASI - Institut Blaise Pascal |
| 8 | * Universite Pierre et Marie Curie (Paris VI) |
| 9 | * |
| 10 | * from |
| 11 | * |
| 12 | * linux/fs/minix/inode.c |
| 13 | * |
| 14 | * Copyright (C) 1991, 1992 Linus Torvalds |
| 15 | * |
| 16 | * Big-endian to little-endian byte-swapping/bitmaps by |
| 17 | * David S. Miller (davem@caip.rutgers.edu), 1995 |
| 18 | */ |
| 19 | |
| 20 | #include <linux/module.h> |
| 21 | #include <linux/string.h> |
| 22 | #include <linux/fs.h> |
| 23 | #include <linux/slab.h> |
| 24 | #include <linux/init.h> |
| 25 | #include <linux/blkdev.h> |
| 26 | #include <linux/parser.h> |
| 27 | #include <linux/random.h> |
| 28 | #include <linux/buffer_head.h> |
| 29 | #include <linux/exportfs.h> |
| 30 | #include <linux/vfs.h> |
| 31 | #include <linux/seq_file.h> |
| 32 | #include <linux/mount.h> |
| 33 | #include <linux/log2.h> |
| 34 | #include <linux/quotaops.h> |
| 35 | #include <linux/uaccess.h> |
| 36 | #include <linux/dax.h> |
| 37 | #include <linux/iversion.h> |
| 38 | #include "ext2.h" |
| 39 | #include "xattr.h" |
| 40 | #include "acl.h" |
| 41 | |
| 42 | static void ext2_write_super(struct super_block *sb); |
| 43 | static int ext2_remount (struct super_block * sb, int * flags, char * data); |
| 44 | static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf); |
| 45 | static int ext2_sync_fs(struct super_block *sb, int wait); |
| 46 | static int ext2_freeze(struct super_block *sb); |
| 47 | static int ext2_unfreeze(struct super_block *sb); |
| 48 | |
| 49 | void ext2_error(struct super_block *sb, const char *function, |
| 50 | const char *fmt, ...) |
| 51 | { |
| 52 | struct va_format vaf; |
| 53 | va_list args; |
| 54 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
| 55 | struct ext2_super_block *es = sbi->s_es; |
| 56 | |
| 57 | if (!sb_rdonly(sb)) { |
| 58 | spin_lock(&sbi->s_lock); |
| 59 | sbi->s_mount_state |= EXT2_ERROR_FS; |
| 60 | es->s_state |= cpu_to_le16(EXT2_ERROR_FS); |
| 61 | spin_unlock(&sbi->s_lock); |
| 62 | ext2_sync_super(sb, es, 1); |
| 63 | } |
| 64 | |
| 65 | va_start(args, fmt); |
| 66 | |
| 67 | vaf.fmt = fmt; |
| 68 | vaf.va = &args; |
| 69 | |
| 70 | printk(KERN_CRIT "EXT2-fs (%s): error: %s: %pV\n", |
| 71 | sb->s_id, function, &vaf); |
| 72 | |
| 73 | va_end(args); |
| 74 | |
| 75 | if (test_opt(sb, ERRORS_PANIC)) |
| 76 | panic("EXT2-fs: panic from previous error\n"); |
| 77 | if (!sb_rdonly(sb) && test_opt(sb, ERRORS_RO)) { |
| 78 | ext2_msg(sb, KERN_CRIT, |
| 79 | "error: remounting filesystem read-only"); |
| 80 | sb->s_flags |= SB_RDONLY; |
| 81 | } |
| 82 | } |
| 83 | |
| 84 | void ext2_msg(struct super_block *sb, const char *prefix, |
| 85 | const char *fmt, ...) |
| 86 | { |
| 87 | struct va_format vaf; |
| 88 | va_list args; |
| 89 | |
| 90 | va_start(args, fmt); |
| 91 | |
| 92 | vaf.fmt = fmt; |
| 93 | vaf.va = &args; |
| 94 | |
| 95 | printk("%sEXT2-fs (%s): %pV\n", prefix, sb->s_id, &vaf); |
| 96 | |
| 97 | va_end(args); |
| 98 | } |
| 99 | |
| 100 | /* |
| 101 | * This must be called with sbi->s_lock held. |
| 102 | */ |
| 103 | void ext2_update_dynamic_rev(struct super_block *sb) |
| 104 | { |
| 105 | struct ext2_super_block *es = EXT2_SB(sb)->s_es; |
| 106 | |
| 107 | if (le32_to_cpu(es->s_rev_level) > EXT2_GOOD_OLD_REV) |
| 108 | return; |
| 109 | |
| 110 | ext2_msg(sb, KERN_WARNING, |
| 111 | "warning: updating to rev %d because of " |
| 112 | "new feature flag, running e2fsck is recommended", |
| 113 | EXT2_DYNAMIC_REV); |
| 114 | |
| 115 | es->s_first_ino = cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO); |
| 116 | es->s_inode_size = cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE); |
| 117 | es->s_rev_level = cpu_to_le32(EXT2_DYNAMIC_REV); |
| 118 | /* leave es->s_feature_*compat flags alone */ |
| 119 | /* es->s_uuid will be set by e2fsck if empty */ |
| 120 | |
| 121 | /* |
| 122 | * The rest of the superblock fields should be zero, and if not it |
| 123 | * means they are likely already in use, so leave them alone. We |
| 124 | * can leave it up to e2fsck to clean up any inconsistencies there. |
| 125 | */ |
| 126 | } |
| 127 | |
| 128 | #ifdef CONFIG_QUOTA |
| 129 | static int ext2_quota_off(struct super_block *sb, int type); |
| 130 | |
| 131 | static void ext2_quota_off_umount(struct super_block *sb) |
| 132 | { |
| 133 | int type; |
| 134 | |
| 135 | for (type = 0; type < MAXQUOTAS; type++) |
| 136 | ext2_quota_off(sb, type); |
| 137 | } |
| 138 | #else |
| 139 | static inline void ext2_quota_off_umount(struct super_block *sb) |
| 140 | { |
| 141 | } |
| 142 | #endif |
| 143 | |
| 144 | static void ext2_put_super (struct super_block * sb) |
| 145 | { |
| 146 | int db_count; |
| 147 | int i; |
| 148 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
| 149 | |
| 150 | ext2_quota_off_umount(sb); |
| 151 | |
| 152 | ext2_xattr_destroy_cache(sbi->s_ea_block_cache); |
| 153 | sbi->s_ea_block_cache = NULL; |
| 154 | |
| 155 | if (!sb_rdonly(sb)) { |
| 156 | struct ext2_super_block *es = sbi->s_es; |
| 157 | |
| 158 | spin_lock(&sbi->s_lock); |
| 159 | es->s_state = cpu_to_le16(sbi->s_mount_state); |
| 160 | spin_unlock(&sbi->s_lock); |
| 161 | ext2_sync_super(sb, es, 1); |
| 162 | } |
| 163 | db_count = sbi->s_gdb_count; |
| 164 | for (i = 0; i < db_count; i++) |
| 165 | brelse(sbi->s_group_desc[i]); |
| 166 | kvfree(sbi->s_group_desc); |
| 167 | kfree(sbi->s_debts); |
| 168 | percpu_counter_destroy(&sbi->s_freeblocks_counter); |
| 169 | percpu_counter_destroy(&sbi->s_freeinodes_counter); |
| 170 | percpu_counter_destroy(&sbi->s_dirs_counter); |
| 171 | brelse (sbi->s_sbh); |
| 172 | sb->s_fs_info = NULL; |
| 173 | kfree(sbi->s_blockgroup_lock); |
| 174 | fs_put_dax(sbi->s_daxdev, NULL); |
| 175 | kfree(sbi); |
| 176 | } |
| 177 | |
| 178 | static struct kmem_cache * ext2_inode_cachep; |
| 179 | |
| 180 | static struct inode *ext2_alloc_inode(struct super_block *sb) |
| 181 | { |
| 182 | struct ext2_inode_info *ei; |
| 183 | ei = alloc_inode_sb(sb, ext2_inode_cachep, GFP_KERNEL); |
| 184 | if (!ei) |
| 185 | return NULL; |
| 186 | ei->i_block_alloc_info = NULL; |
| 187 | inode_set_iversion(&ei->vfs_inode, 1); |
| 188 | #ifdef CONFIG_QUOTA |
| 189 | memset(&ei->i_dquot, 0, sizeof(ei->i_dquot)); |
| 190 | #endif |
| 191 | |
| 192 | return &ei->vfs_inode; |
| 193 | } |
| 194 | |
| 195 | static void ext2_free_in_core_inode(struct inode *inode) |
| 196 | { |
| 197 | kmem_cache_free(ext2_inode_cachep, EXT2_I(inode)); |
| 198 | } |
| 199 | |
| 200 | static void init_once(void *foo) |
| 201 | { |
| 202 | struct ext2_inode_info *ei = (struct ext2_inode_info *) foo; |
| 203 | |
| 204 | rwlock_init(&ei->i_meta_lock); |
| 205 | #ifdef CONFIG_EXT2_FS_XATTR |
| 206 | init_rwsem(&ei->xattr_sem); |
| 207 | #endif |
| 208 | mutex_init(&ei->truncate_mutex); |
| 209 | inode_init_once(&ei->vfs_inode); |
| 210 | } |
| 211 | |
| 212 | static int __init init_inodecache(void) |
| 213 | { |
| 214 | ext2_inode_cachep = kmem_cache_create_usercopy("ext2_inode_cache", |
| 215 | sizeof(struct ext2_inode_info), 0, |
| 216 | SLAB_RECLAIM_ACCOUNT | SLAB_ACCOUNT, |
| 217 | offsetof(struct ext2_inode_info, i_data), |
| 218 | sizeof_field(struct ext2_inode_info, i_data), |
| 219 | init_once); |
| 220 | if (ext2_inode_cachep == NULL) |
| 221 | return -ENOMEM; |
| 222 | return 0; |
| 223 | } |
| 224 | |
| 225 | static void destroy_inodecache(void) |
| 226 | { |
| 227 | /* |
| 228 | * Make sure all delayed rcu free inodes are flushed before we |
| 229 | * destroy cache. |
| 230 | */ |
| 231 | rcu_barrier(); |
| 232 | kmem_cache_destroy(ext2_inode_cachep); |
| 233 | } |
| 234 | |
| 235 | static int ext2_show_options(struct seq_file *seq, struct dentry *root) |
| 236 | { |
| 237 | struct super_block *sb = root->d_sb; |
| 238 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
| 239 | struct ext2_super_block *es = sbi->s_es; |
| 240 | unsigned long def_mount_opts; |
| 241 | |
| 242 | spin_lock(&sbi->s_lock); |
| 243 | def_mount_opts = le32_to_cpu(es->s_default_mount_opts); |
| 244 | |
| 245 | if (sbi->s_sb_block != 1) |
| 246 | seq_printf(seq, ",sb=%lu", sbi->s_sb_block); |
| 247 | if (test_opt(sb, MINIX_DF)) |
| 248 | seq_puts(seq, ",minixdf"); |
| 249 | if (test_opt(sb, GRPID)) |
| 250 | seq_puts(seq, ",grpid"); |
| 251 | if (!test_opt(sb, GRPID) && (def_mount_opts & EXT2_DEFM_BSDGROUPS)) |
| 252 | seq_puts(seq, ",nogrpid"); |
| 253 | if (!uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT2_DEF_RESUID)) || |
| 254 | le16_to_cpu(es->s_def_resuid) != EXT2_DEF_RESUID) { |
| 255 | seq_printf(seq, ",resuid=%u", |
| 256 | from_kuid_munged(&init_user_ns, sbi->s_resuid)); |
| 257 | } |
| 258 | if (!gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT2_DEF_RESGID)) || |
| 259 | le16_to_cpu(es->s_def_resgid) != EXT2_DEF_RESGID) { |
| 260 | seq_printf(seq, ",resgid=%u", |
| 261 | from_kgid_munged(&init_user_ns, sbi->s_resgid)); |
| 262 | } |
| 263 | if (test_opt(sb, ERRORS_RO)) { |
| 264 | int def_errors = le16_to_cpu(es->s_errors); |
| 265 | |
| 266 | if (def_errors == EXT2_ERRORS_PANIC || |
| 267 | def_errors == EXT2_ERRORS_CONTINUE) { |
| 268 | seq_puts(seq, ",errors=remount-ro"); |
| 269 | } |
| 270 | } |
| 271 | if (test_opt(sb, ERRORS_CONT)) |
| 272 | seq_puts(seq, ",errors=continue"); |
| 273 | if (test_opt(sb, ERRORS_PANIC)) |
| 274 | seq_puts(seq, ",errors=panic"); |
| 275 | if (test_opt(sb, NO_UID32)) |
| 276 | seq_puts(seq, ",nouid32"); |
| 277 | if (test_opt(sb, DEBUG)) |
| 278 | seq_puts(seq, ",debug"); |
| 279 | if (test_opt(sb, OLDALLOC)) |
| 280 | seq_puts(seq, ",oldalloc"); |
| 281 | |
| 282 | #ifdef CONFIG_EXT2_FS_XATTR |
| 283 | if (test_opt(sb, XATTR_USER)) |
| 284 | seq_puts(seq, ",user_xattr"); |
| 285 | if (!test_opt(sb, XATTR_USER) && |
| 286 | (def_mount_opts & EXT2_DEFM_XATTR_USER)) { |
| 287 | seq_puts(seq, ",nouser_xattr"); |
| 288 | } |
| 289 | #endif |
| 290 | |
| 291 | #ifdef CONFIG_EXT2_FS_POSIX_ACL |
| 292 | if (test_opt(sb, POSIX_ACL)) |
| 293 | seq_puts(seq, ",acl"); |
| 294 | if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT2_DEFM_ACL)) |
| 295 | seq_puts(seq, ",noacl"); |
| 296 | #endif |
| 297 | |
| 298 | if (test_opt(sb, USRQUOTA)) |
| 299 | seq_puts(seq, ",usrquota"); |
| 300 | |
| 301 | if (test_opt(sb, GRPQUOTA)) |
| 302 | seq_puts(seq, ",grpquota"); |
| 303 | |
| 304 | if (test_opt(sb, XIP)) |
| 305 | seq_puts(seq, ",xip"); |
| 306 | |
| 307 | if (test_opt(sb, DAX)) |
| 308 | seq_puts(seq, ",dax"); |
| 309 | |
| 310 | if (!test_opt(sb, RESERVATION)) |
| 311 | seq_puts(seq, ",noreservation"); |
| 312 | |
| 313 | spin_unlock(&sbi->s_lock); |
| 314 | return 0; |
| 315 | } |
| 316 | |
| 317 | #ifdef CONFIG_QUOTA |
| 318 | static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off); |
| 319 | static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off); |
| 320 | static int ext2_quota_on(struct super_block *sb, int type, int format_id, |
| 321 | const struct path *path); |
| 322 | static struct dquot __rcu **ext2_get_dquots(struct inode *inode) |
| 323 | { |
| 324 | return EXT2_I(inode)->i_dquot; |
| 325 | } |
| 326 | |
| 327 | static const struct quotactl_ops ext2_quotactl_ops = { |
| 328 | .quota_on = ext2_quota_on, |
| 329 | .quota_off = ext2_quota_off, |
| 330 | .quota_sync = dquot_quota_sync, |
| 331 | .get_state = dquot_get_state, |
| 332 | .set_info = dquot_set_dqinfo, |
| 333 | .get_dqblk = dquot_get_dqblk, |
| 334 | .set_dqblk = dquot_set_dqblk, |
| 335 | .get_nextdqblk = dquot_get_next_dqblk, |
| 336 | }; |
| 337 | #endif |
| 338 | |
| 339 | static const struct super_operations ext2_sops = { |
| 340 | .alloc_inode = ext2_alloc_inode, |
| 341 | .free_inode = ext2_free_in_core_inode, |
| 342 | .write_inode = ext2_write_inode, |
| 343 | .evict_inode = ext2_evict_inode, |
| 344 | .put_super = ext2_put_super, |
| 345 | .sync_fs = ext2_sync_fs, |
| 346 | .freeze_fs = ext2_freeze, |
| 347 | .unfreeze_fs = ext2_unfreeze, |
| 348 | .statfs = ext2_statfs, |
| 349 | .remount_fs = ext2_remount, |
| 350 | .show_options = ext2_show_options, |
| 351 | #ifdef CONFIG_QUOTA |
| 352 | .quota_read = ext2_quota_read, |
| 353 | .quota_write = ext2_quota_write, |
| 354 | .get_dquots = ext2_get_dquots, |
| 355 | #endif |
| 356 | }; |
| 357 | |
| 358 | static struct inode *ext2_nfs_get_inode(struct super_block *sb, |
| 359 | u64 ino, u32 generation) |
| 360 | { |
| 361 | struct inode *inode; |
| 362 | |
| 363 | if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO) |
| 364 | return ERR_PTR(-ESTALE); |
| 365 | if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count)) |
| 366 | return ERR_PTR(-ESTALE); |
| 367 | |
| 368 | /* |
| 369 | * ext2_iget isn't quite right if the inode is currently unallocated! |
| 370 | * However ext2_iget currently does appropriate checks to handle stale |
| 371 | * inodes so everything is OK. |
| 372 | */ |
| 373 | inode = ext2_iget(sb, ino); |
| 374 | if (IS_ERR(inode)) |
| 375 | return ERR_CAST(inode); |
| 376 | if (generation && inode->i_generation != generation) { |
| 377 | /* we didn't find the right inode.. */ |
| 378 | iput(inode); |
| 379 | return ERR_PTR(-ESTALE); |
| 380 | } |
| 381 | return inode; |
| 382 | } |
| 383 | |
| 384 | static struct dentry *ext2_fh_to_dentry(struct super_block *sb, struct fid *fid, |
| 385 | int fh_len, int fh_type) |
| 386 | { |
| 387 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, |
| 388 | ext2_nfs_get_inode); |
| 389 | } |
| 390 | |
| 391 | static struct dentry *ext2_fh_to_parent(struct super_block *sb, struct fid *fid, |
| 392 | int fh_len, int fh_type) |
| 393 | { |
| 394 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, |
| 395 | ext2_nfs_get_inode); |
| 396 | } |
| 397 | |
| 398 | static const struct export_operations ext2_export_ops = { |
| 399 | .encode_fh = generic_encode_ino32_fh, |
| 400 | .fh_to_dentry = ext2_fh_to_dentry, |
| 401 | .fh_to_parent = ext2_fh_to_parent, |
| 402 | .get_parent = ext2_get_parent, |
| 403 | }; |
| 404 | |
| 405 | static unsigned long get_sb_block(void **data) |
| 406 | { |
| 407 | unsigned long sb_block; |
| 408 | char *options = (char *) *data; |
| 409 | |
| 410 | if (!options || strncmp(options, "sb=", 3) != 0) |
| 411 | return 1; /* Default location */ |
| 412 | options += 3; |
| 413 | sb_block = simple_strtoul(options, &options, 0); |
| 414 | if (*options && *options != ',') { |
| 415 | printk("EXT2-fs: Invalid sb specification: %s\n", |
| 416 | (char *) *data); |
| 417 | return 1; |
| 418 | } |
| 419 | if (*options == ',') |
| 420 | options++; |
| 421 | *data = (void *) options; |
| 422 | return sb_block; |
| 423 | } |
| 424 | |
| 425 | enum { |
| 426 | Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, |
| 427 | Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, |
| 428 | Opt_err_ro, Opt_nouid32, Opt_debug, |
| 429 | Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr, |
| 430 | Opt_acl, Opt_noacl, Opt_xip, Opt_dax, Opt_ignore, Opt_err, Opt_quota, |
| 431 | Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation |
| 432 | }; |
| 433 | |
| 434 | static const match_table_t tokens = { |
| 435 | {Opt_bsd_df, "bsddf"}, |
| 436 | {Opt_minix_df, "minixdf"}, |
| 437 | {Opt_grpid, "grpid"}, |
| 438 | {Opt_grpid, "bsdgroups"}, |
| 439 | {Opt_nogrpid, "nogrpid"}, |
| 440 | {Opt_nogrpid, "sysvgroups"}, |
| 441 | {Opt_resgid, "resgid=%u"}, |
| 442 | {Opt_resuid, "resuid=%u"}, |
| 443 | {Opt_sb, "sb=%u"}, |
| 444 | {Opt_err_cont, "errors=continue"}, |
| 445 | {Opt_err_panic, "errors=panic"}, |
| 446 | {Opt_err_ro, "errors=remount-ro"}, |
| 447 | {Opt_nouid32, "nouid32"}, |
| 448 | {Opt_debug, "debug"}, |
| 449 | {Opt_oldalloc, "oldalloc"}, |
| 450 | {Opt_orlov, "orlov"}, |
| 451 | {Opt_nobh, "nobh"}, |
| 452 | {Opt_user_xattr, "user_xattr"}, |
| 453 | {Opt_nouser_xattr, "nouser_xattr"}, |
| 454 | {Opt_acl, "acl"}, |
| 455 | {Opt_noacl, "noacl"}, |
| 456 | {Opt_xip, "xip"}, |
| 457 | {Opt_dax, "dax"}, |
| 458 | {Opt_grpquota, "grpquota"}, |
| 459 | {Opt_ignore, "noquota"}, |
| 460 | {Opt_quota, "quota"}, |
| 461 | {Opt_usrquota, "usrquota"}, |
| 462 | {Opt_reservation, "reservation"}, |
| 463 | {Opt_noreservation, "noreservation"}, |
| 464 | {Opt_err, NULL} |
| 465 | }; |
| 466 | |
| 467 | static int parse_options(char *options, struct super_block *sb, |
| 468 | struct ext2_mount_options *opts) |
| 469 | { |
| 470 | char *p; |
| 471 | substring_t args[MAX_OPT_ARGS]; |
| 472 | int option; |
| 473 | kuid_t uid; |
| 474 | kgid_t gid; |
| 475 | |
| 476 | if (!options) |
| 477 | return 1; |
| 478 | |
| 479 | while ((p = strsep (&options, ",")) != NULL) { |
| 480 | int token; |
| 481 | if (!*p) |
| 482 | continue; |
| 483 | |
| 484 | token = match_token(p, tokens, args); |
| 485 | switch (token) { |
| 486 | case Opt_bsd_df: |
| 487 | clear_opt (opts->s_mount_opt, MINIX_DF); |
| 488 | break; |
| 489 | case Opt_minix_df: |
| 490 | set_opt (opts->s_mount_opt, MINIX_DF); |
| 491 | break; |
| 492 | case Opt_grpid: |
| 493 | set_opt (opts->s_mount_opt, GRPID); |
| 494 | break; |
| 495 | case Opt_nogrpid: |
| 496 | clear_opt (opts->s_mount_opt, GRPID); |
| 497 | break; |
| 498 | case Opt_resuid: |
| 499 | if (match_int(&args[0], &option)) |
| 500 | return 0; |
| 501 | uid = make_kuid(current_user_ns(), option); |
| 502 | if (!uid_valid(uid)) { |
| 503 | ext2_msg(sb, KERN_ERR, "Invalid uid value %d", option); |
| 504 | return 0; |
| 505 | |
| 506 | } |
| 507 | opts->s_resuid = uid; |
| 508 | break; |
| 509 | case Opt_resgid: |
| 510 | if (match_int(&args[0], &option)) |
| 511 | return 0; |
| 512 | gid = make_kgid(current_user_ns(), option); |
| 513 | if (!gid_valid(gid)) { |
| 514 | ext2_msg(sb, KERN_ERR, "Invalid gid value %d", option); |
| 515 | return 0; |
| 516 | } |
| 517 | opts->s_resgid = gid; |
| 518 | break; |
| 519 | case Opt_sb: |
| 520 | /* handled by get_sb_block() instead of here */ |
| 521 | /* *sb_block = match_int(&args[0]); */ |
| 522 | break; |
| 523 | case Opt_err_panic: |
| 524 | clear_opt (opts->s_mount_opt, ERRORS_CONT); |
| 525 | clear_opt (opts->s_mount_opt, ERRORS_RO); |
| 526 | set_opt (opts->s_mount_opt, ERRORS_PANIC); |
| 527 | break; |
| 528 | case Opt_err_ro: |
| 529 | clear_opt (opts->s_mount_opt, ERRORS_CONT); |
| 530 | clear_opt (opts->s_mount_opt, ERRORS_PANIC); |
| 531 | set_opt (opts->s_mount_opt, ERRORS_RO); |
| 532 | break; |
| 533 | case Opt_err_cont: |
| 534 | clear_opt (opts->s_mount_opt, ERRORS_RO); |
| 535 | clear_opt (opts->s_mount_opt, ERRORS_PANIC); |
| 536 | set_opt (opts->s_mount_opt, ERRORS_CONT); |
| 537 | break; |
| 538 | case Opt_nouid32: |
| 539 | set_opt (opts->s_mount_opt, NO_UID32); |
| 540 | break; |
| 541 | case Opt_debug: |
| 542 | set_opt (opts->s_mount_opt, DEBUG); |
| 543 | break; |
| 544 | case Opt_oldalloc: |
| 545 | set_opt (opts->s_mount_opt, OLDALLOC); |
| 546 | break; |
| 547 | case Opt_orlov: |
| 548 | clear_opt (opts->s_mount_opt, OLDALLOC); |
| 549 | break; |
| 550 | case Opt_nobh: |
| 551 | ext2_msg(sb, KERN_INFO, |
| 552 | "nobh option not supported"); |
| 553 | break; |
| 554 | #ifdef CONFIG_EXT2_FS_XATTR |
| 555 | case Opt_user_xattr: |
| 556 | set_opt (opts->s_mount_opt, XATTR_USER); |
| 557 | break; |
| 558 | case Opt_nouser_xattr: |
| 559 | clear_opt (opts->s_mount_opt, XATTR_USER); |
| 560 | break; |
| 561 | #else |
| 562 | case Opt_user_xattr: |
| 563 | case Opt_nouser_xattr: |
| 564 | ext2_msg(sb, KERN_INFO, "(no)user_xattr options" |
| 565 | "not supported"); |
| 566 | break; |
| 567 | #endif |
| 568 | #ifdef CONFIG_EXT2_FS_POSIX_ACL |
| 569 | case Opt_acl: |
| 570 | set_opt(opts->s_mount_opt, POSIX_ACL); |
| 571 | break; |
| 572 | case Opt_noacl: |
| 573 | clear_opt(opts->s_mount_opt, POSIX_ACL); |
| 574 | break; |
| 575 | #else |
| 576 | case Opt_acl: |
| 577 | case Opt_noacl: |
| 578 | ext2_msg(sb, KERN_INFO, |
| 579 | "(no)acl options not supported"); |
| 580 | break; |
| 581 | #endif |
| 582 | case Opt_xip: |
| 583 | ext2_msg(sb, KERN_INFO, "use dax instead of xip"); |
| 584 | set_opt(opts->s_mount_opt, XIP); |
| 585 | fallthrough; |
| 586 | case Opt_dax: |
| 587 | #ifdef CONFIG_FS_DAX |
| 588 | ext2_msg(sb, KERN_WARNING, |
| 589 | "DAX enabled. Warning: EXPERIMENTAL, use at your own risk"); |
| 590 | set_opt(opts->s_mount_opt, DAX); |
| 591 | #else |
| 592 | ext2_msg(sb, KERN_INFO, "dax option not supported"); |
| 593 | #endif |
| 594 | break; |
| 595 | |
| 596 | #if defined(CONFIG_QUOTA) |
| 597 | case Opt_quota: |
| 598 | case Opt_usrquota: |
| 599 | set_opt(opts->s_mount_opt, USRQUOTA); |
| 600 | break; |
| 601 | |
| 602 | case Opt_grpquota: |
| 603 | set_opt(opts->s_mount_opt, GRPQUOTA); |
| 604 | break; |
| 605 | #else |
| 606 | case Opt_quota: |
| 607 | case Opt_usrquota: |
| 608 | case Opt_grpquota: |
| 609 | ext2_msg(sb, KERN_INFO, |
| 610 | "quota operations not supported"); |
| 611 | break; |
| 612 | #endif |
| 613 | |
| 614 | case Opt_reservation: |
| 615 | set_opt(opts->s_mount_opt, RESERVATION); |
| 616 | ext2_msg(sb, KERN_INFO, "reservations ON"); |
| 617 | break; |
| 618 | case Opt_noreservation: |
| 619 | clear_opt(opts->s_mount_opt, RESERVATION); |
| 620 | ext2_msg(sb, KERN_INFO, "reservations OFF"); |
| 621 | break; |
| 622 | case Opt_ignore: |
| 623 | break; |
| 624 | default: |
| 625 | return 0; |
| 626 | } |
| 627 | } |
| 628 | return 1; |
| 629 | } |
| 630 | |
| 631 | static int ext2_setup_super (struct super_block * sb, |
| 632 | struct ext2_super_block * es, |
| 633 | int read_only) |
| 634 | { |
| 635 | int res = 0; |
| 636 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
| 637 | |
| 638 | if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) { |
| 639 | ext2_msg(sb, KERN_ERR, |
| 640 | "error: revision level too high, " |
| 641 | "forcing read-only mode"); |
| 642 | res = SB_RDONLY; |
| 643 | } |
| 644 | if (read_only) |
| 645 | return res; |
| 646 | if (!(sbi->s_mount_state & EXT2_VALID_FS)) |
| 647 | ext2_msg(sb, KERN_WARNING, |
| 648 | "warning: mounting unchecked fs, " |
| 649 | "running e2fsck is recommended"); |
| 650 | else if ((sbi->s_mount_state & EXT2_ERROR_FS)) |
| 651 | ext2_msg(sb, KERN_WARNING, |
| 652 | "warning: mounting fs with errors, " |
| 653 | "running e2fsck is recommended"); |
| 654 | else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && |
| 655 | le16_to_cpu(es->s_mnt_count) >= |
| 656 | (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) |
| 657 | ext2_msg(sb, KERN_WARNING, |
| 658 | "warning: maximal mount count reached, " |
| 659 | "running e2fsck is recommended"); |
| 660 | else if (le32_to_cpu(es->s_checkinterval) && |
| 661 | (le32_to_cpu(es->s_lastcheck) + |
| 662 | le32_to_cpu(es->s_checkinterval) <= |
| 663 | ktime_get_real_seconds())) |
| 664 | ext2_msg(sb, KERN_WARNING, |
| 665 | "warning: checktime reached, " |
| 666 | "running e2fsck is recommended"); |
| 667 | if (!le16_to_cpu(es->s_max_mnt_count)) |
| 668 | es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT); |
| 669 | le16_add_cpu(&es->s_mnt_count, 1); |
| 670 | if (test_opt (sb, DEBUG)) |
| 671 | ext2_msg(sb, KERN_INFO, "%s, %s, bs=%lu, gc=%lu, " |
| 672 | "bpg=%lu, ipg=%lu, mo=%04lx]", |
| 673 | EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize, |
| 674 | sbi->s_groups_count, |
| 675 | EXT2_BLOCKS_PER_GROUP(sb), |
| 676 | EXT2_INODES_PER_GROUP(sb), |
| 677 | sbi->s_mount_opt); |
| 678 | return res; |
| 679 | } |
| 680 | |
| 681 | static int ext2_check_descriptors(struct super_block *sb) |
| 682 | { |
| 683 | int i; |
| 684 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
| 685 | |
| 686 | ext2_debug ("Checking group descriptors"); |
| 687 | |
| 688 | for (i = 0; i < sbi->s_groups_count; i++) { |
| 689 | struct ext2_group_desc *gdp = ext2_get_group_desc(sb, i, NULL); |
| 690 | ext2_fsblk_t first_block = ext2_group_first_block_no(sb, i); |
| 691 | ext2_fsblk_t last_block = ext2_group_last_block_no(sb, i); |
| 692 | |
| 693 | if (le32_to_cpu(gdp->bg_block_bitmap) < first_block || |
| 694 | le32_to_cpu(gdp->bg_block_bitmap) > last_block) |
| 695 | { |
| 696 | ext2_error (sb, "ext2_check_descriptors", |
| 697 | "Block bitmap for group %d" |
| 698 | " not in group (block %lu)!", |
| 699 | i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap)); |
| 700 | return 0; |
| 701 | } |
| 702 | if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block || |
| 703 | le32_to_cpu(gdp->bg_inode_bitmap) > last_block) |
| 704 | { |
| 705 | ext2_error (sb, "ext2_check_descriptors", |
| 706 | "Inode bitmap for group %d" |
| 707 | " not in group (block %lu)!", |
| 708 | i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap)); |
| 709 | return 0; |
| 710 | } |
| 711 | if (le32_to_cpu(gdp->bg_inode_table) < first_block || |
| 712 | le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 > |
| 713 | last_block) |
| 714 | { |
| 715 | ext2_error (sb, "ext2_check_descriptors", |
| 716 | "Inode table for group %d" |
| 717 | " not in group (block %lu)!", |
| 718 | i, (unsigned long) le32_to_cpu(gdp->bg_inode_table)); |
| 719 | return 0; |
| 720 | } |
| 721 | } |
| 722 | return 1; |
| 723 | } |
| 724 | |
| 725 | /* |
| 726 | * Maximal file size. There is a direct, and {,double-,triple-}indirect |
| 727 | * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. |
| 728 | * We need to be 1 filesystem block less than the 2^32 sector limit. |
| 729 | */ |
| 730 | static loff_t ext2_max_size(int bits) |
| 731 | { |
| 732 | loff_t res = EXT2_NDIR_BLOCKS; |
| 733 | int meta_blocks; |
| 734 | unsigned int upper_limit; |
| 735 | unsigned int ppb = 1 << (bits-2); |
| 736 | |
| 737 | /* This is calculated to be the largest file size for a |
| 738 | * dense, file such that the total number of |
| 739 | * sectors in the file, including data and all indirect blocks, |
| 740 | * does not exceed 2^32 -1 |
| 741 | * __u32 i_blocks representing the total number of |
| 742 | * 512 bytes blocks of the file |
| 743 | */ |
| 744 | upper_limit = (1LL << 32) - 1; |
| 745 | |
| 746 | /* total blocks in file system block size */ |
| 747 | upper_limit >>= (bits - 9); |
| 748 | |
| 749 | /* Compute how many blocks we can address by block tree */ |
| 750 | res += 1LL << (bits-2); |
| 751 | res += 1LL << (2*(bits-2)); |
| 752 | res += 1LL << (3*(bits-2)); |
| 753 | /* Compute how many metadata blocks are needed */ |
| 754 | meta_blocks = 1; |
| 755 | meta_blocks += 1 + ppb; |
| 756 | meta_blocks += 1 + ppb + ppb * ppb; |
| 757 | /* Does block tree limit file size? */ |
| 758 | if (res + meta_blocks <= upper_limit) |
| 759 | goto check_lfs; |
| 760 | |
| 761 | res = upper_limit; |
| 762 | /* How many metadata blocks are needed for addressing upper_limit? */ |
| 763 | upper_limit -= EXT2_NDIR_BLOCKS; |
| 764 | /* indirect blocks */ |
| 765 | meta_blocks = 1; |
| 766 | upper_limit -= ppb; |
| 767 | /* double indirect blocks */ |
| 768 | if (upper_limit < ppb * ppb) { |
| 769 | meta_blocks += 1 + DIV_ROUND_UP(upper_limit, ppb); |
| 770 | res -= meta_blocks; |
| 771 | goto check_lfs; |
| 772 | } |
| 773 | meta_blocks += 1 + ppb; |
| 774 | upper_limit -= ppb * ppb; |
| 775 | /* tripple indirect blocks for the rest */ |
| 776 | meta_blocks += 1 + DIV_ROUND_UP(upper_limit, ppb) + |
| 777 | DIV_ROUND_UP(upper_limit, ppb*ppb); |
| 778 | res -= meta_blocks; |
| 779 | check_lfs: |
| 780 | res <<= bits; |
| 781 | if (res > MAX_LFS_FILESIZE) |
| 782 | res = MAX_LFS_FILESIZE; |
| 783 | |
| 784 | return res; |
| 785 | } |
| 786 | |
| 787 | static unsigned long descriptor_loc(struct super_block *sb, |
| 788 | unsigned long logic_sb_block, |
| 789 | int nr) |
| 790 | { |
| 791 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
| 792 | unsigned long bg, first_meta_bg; |
| 793 | |
| 794 | first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); |
| 795 | |
| 796 | if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) || |
| 797 | nr < first_meta_bg) |
| 798 | return (logic_sb_block + nr + 1); |
| 799 | bg = sbi->s_desc_per_block * nr; |
| 800 | |
| 801 | return ext2_group_first_block_no(sb, bg) + ext2_bg_has_super(sb, bg); |
| 802 | } |
| 803 | |
| 804 | static int ext2_fill_super(struct super_block *sb, void *data, int silent) |
| 805 | { |
| 806 | struct buffer_head * bh; |
| 807 | struct ext2_sb_info * sbi; |
| 808 | struct ext2_super_block * es; |
| 809 | struct inode *root; |
| 810 | unsigned long block; |
| 811 | unsigned long sb_block = get_sb_block(&data); |
| 812 | unsigned long logic_sb_block; |
| 813 | unsigned long offset = 0; |
| 814 | unsigned long def_mount_opts; |
| 815 | long ret = -ENOMEM; |
| 816 | int blocksize = BLOCK_SIZE; |
| 817 | int db_count; |
| 818 | int i, j; |
| 819 | __le32 features; |
| 820 | int err; |
| 821 | struct ext2_mount_options opts; |
| 822 | |
| 823 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); |
| 824 | if (!sbi) |
| 825 | return -ENOMEM; |
| 826 | |
| 827 | sbi->s_blockgroup_lock = |
| 828 | kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); |
| 829 | if (!sbi->s_blockgroup_lock) { |
| 830 | kfree(sbi); |
| 831 | return -ENOMEM; |
| 832 | } |
| 833 | sb->s_fs_info = sbi; |
| 834 | sbi->s_sb_block = sb_block; |
| 835 | sbi->s_daxdev = fs_dax_get_by_bdev(sb->s_bdev, &sbi->s_dax_part_off, |
| 836 | NULL, NULL); |
| 837 | |
| 838 | spin_lock_init(&sbi->s_lock); |
| 839 | ret = -EINVAL; |
| 840 | |
| 841 | /* |
| 842 | * See what the current blocksize for the device is, and |
| 843 | * use that as the blocksize. Otherwise (or if the blocksize |
| 844 | * is smaller than the default) use the default. |
| 845 | * This is important for devices that have a hardware |
| 846 | * sectorsize that is larger than the default. |
| 847 | */ |
| 848 | blocksize = sb_min_blocksize(sb, BLOCK_SIZE); |
| 849 | if (!blocksize) { |
| 850 | ext2_msg(sb, KERN_ERR, "error: unable to set blocksize"); |
| 851 | goto failed_sbi; |
| 852 | } |
| 853 | |
| 854 | /* |
| 855 | * If the superblock doesn't start on a hardware sector boundary, |
| 856 | * calculate the offset. |
| 857 | */ |
| 858 | if (blocksize != BLOCK_SIZE) { |
| 859 | logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; |
| 860 | offset = (sb_block*BLOCK_SIZE) % blocksize; |
| 861 | } else { |
| 862 | logic_sb_block = sb_block; |
| 863 | } |
| 864 | |
| 865 | if (!(bh = sb_bread(sb, logic_sb_block))) { |
| 866 | ext2_msg(sb, KERN_ERR, "error: unable to read superblock"); |
| 867 | goto failed_sbi; |
| 868 | } |
| 869 | /* |
| 870 | * Note: s_es must be initialized as soon as possible because |
| 871 | * some ext2 macro-instructions depend on its value |
| 872 | */ |
| 873 | es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); |
| 874 | sbi->s_es = es; |
| 875 | sb->s_magic = le16_to_cpu(es->s_magic); |
| 876 | |
| 877 | if (sb->s_magic != EXT2_SUPER_MAGIC) |
| 878 | goto cantfind_ext2; |
| 879 | |
| 880 | opts.s_mount_opt = 0; |
| 881 | /* Set defaults before we parse the mount options */ |
| 882 | def_mount_opts = le32_to_cpu(es->s_default_mount_opts); |
| 883 | if (def_mount_opts & EXT2_DEFM_DEBUG) |
| 884 | set_opt(opts.s_mount_opt, DEBUG); |
| 885 | if (def_mount_opts & EXT2_DEFM_BSDGROUPS) |
| 886 | set_opt(opts.s_mount_opt, GRPID); |
| 887 | if (def_mount_opts & EXT2_DEFM_UID16) |
| 888 | set_opt(opts.s_mount_opt, NO_UID32); |
| 889 | #ifdef CONFIG_EXT2_FS_XATTR |
| 890 | if (def_mount_opts & EXT2_DEFM_XATTR_USER) |
| 891 | set_opt(opts.s_mount_opt, XATTR_USER); |
| 892 | #endif |
| 893 | #ifdef CONFIG_EXT2_FS_POSIX_ACL |
| 894 | if (def_mount_opts & EXT2_DEFM_ACL) |
| 895 | set_opt(opts.s_mount_opt, POSIX_ACL); |
| 896 | #endif |
| 897 | |
| 898 | if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC) |
| 899 | set_opt(opts.s_mount_opt, ERRORS_PANIC); |
| 900 | else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE) |
| 901 | set_opt(opts.s_mount_opt, ERRORS_CONT); |
| 902 | else |
| 903 | set_opt(opts.s_mount_opt, ERRORS_RO); |
| 904 | |
| 905 | opts.s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid)); |
| 906 | opts.s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid)); |
| 907 | |
| 908 | set_opt(opts.s_mount_opt, RESERVATION); |
| 909 | |
| 910 | if (!parse_options((char *) data, sb, &opts)) |
| 911 | goto failed_mount; |
| 912 | |
| 913 | sbi->s_mount_opt = opts.s_mount_opt; |
| 914 | sbi->s_resuid = opts.s_resuid; |
| 915 | sbi->s_resgid = opts.s_resgid; |
| 916 | |
| 917 | sb->s_flags = (sb->s_flags & ~SB_POSIXACL) | |
| 918 | (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0); |
| 919 | sb->s_iflags |= SB_I_CGROUPWB; |
| 920 | |
| 921 | if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV && |
| 922 | (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) || |
| 923 | EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) || |
| 924 | EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U))) |
| 925 | ext2_msg(sb, KERN_WARNING, |
| 926 | "warning: feature flags set on rev 0 fs, " |
| 927 | "running e2fsck is recommended"); |
| 928 | /* |
| 929 | * Check feature flags regardless of the revision level, since we |
| 930 | * previously didn't change the revision level when setting the flags, |
| 931 | * so there is a chance incompat flags are set on a rev 0 filesystem. |
| 932 | */ |
| 933 | features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP); |
| 934 | if (features) { |
| 935 | ext2_msg(sb, KERN_ERR, "error: couldn't mount because of " |
| 936 | "unsupported optional features (%x)", |
| 937 | le32_to_cpu(features)); |
| 938 | goto failed_mount; |
| 939 | } |
| 940 | if (!sb_rdonly(sb) && (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){ |
| 941 | ext2_msg(sb, KERN_ERR, "error: couldn't mount RDWR because of " |
| 942 | "unsupported optional features (%x)", |
| 943 | le32_to_cpu(features)); |
| 944 | goto failed_mount; |
| 945 | } |
| 946 | |
| 947 | if (le32_to_cpu(es->s_log_block_size) > |
| 948 | (EXT2_MAX_BLOCK_LOG_SIZE - BLOCK_SIZE_BITS)) { |
| 949 | ext2_msg(sb, KERN_ERR, |
| 950 | "Invalid log block size: %u", |
| 951 | le32_to_cpu(es->s_log_block_size)); |
| 952 | goto failed_mount; |
| 953 | } |
| 954 | blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size); |
| 955 | |
| 956 | if (test_opt(sb, DAX)) { |
| 957 | if (!sbi->s_daxdev) { |
| 958 | ext2_msg(sb, KERN_ERR, |
| 959 | "DAX unsupported by block device. Turning off DAX."); |
| 960 | clear_opt(sbi->s_mount_opt, DAX); |
| 961 | } else if (blocksize != PAGE_SIZE) { |
| 962 | ext2_msg(sb, KERN_ERR, "unsupported blocksize for DAX\n"); |
| 963 | clear_opt(sbi->s_mount_opt, DAX); |
| 964 | } |
| 965 | } |
| 966 | |
| 967 | /* If the blocksize doesn't match, re-read the thing.. */ |
| 968 | if (sb->s_blocksize != blocksize) { |
| 969 | brelse(bh); |
| 970 | |
| 971 | if (!sb_set_blocksize(sb, blocksize)) { |
| 972 | ext2_msg(sb, KERN_ERR, |
| 973 | "error: bad blocksize %d", blocksize); |
| 974 | goto failed_sbi; |
| 975 | } |
| 976 | |
| 977 | logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; |
| 978 | offset = (sb_block*BLOCK_SIZE) % blocksize; |
| 979 | bh = sb_bread(sb, logic_sb_block); |
| 980 | if(!bh) { |
| 981 | ext2_msg(sb, KERN_ERR, "error: couldn't read" |
| 982 | "superblock on 2nd try"); |
| 983 | goto failed_sbi; |
| 984 | } |
| 985 | es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); |
| 986 | sbi->s_es = es; |
| 987 | if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) { |
| 988 | ext2_msg(sb, KERN_ERR, "error: magic mismatch"); |
| 989 | goto failed_mount; |
| 990 | } |
| 991 | } |
| 992 | |
| 993 | sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits); |
| 994 | sb->s_max_links = EXT2_LINK_MAX; |
| 995 | sb->s_time_min = S32_MIN; |
| 996 | sb->s_time_max = S32_MAX; |
| 997 | |
| 998 | if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) { |
| 999 | sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE; |
| 1000 | sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO; |
| 1001 | } else { |
| 1002 | sbi->s_inode_size = le16_to_cpu(es->s_inode_size); |
| 1003 | sbi->s_first_ino = le32_to_cpu(es->s_first_ino); |
| 1004 | if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) || |
| 1005 | !is_power_of_2(sbi->s_inode_size) || |
| 1006 | (sbi->s_inode_size > blocksize)) { |
| 1007 | ext2_msg(sb, KERN_ERR, |
| 1008 | "error: unsupported inode size: %d", |
| 1009 | sbi->s_inode_size); |
| 1010 | goto failed_mount; |
| 1011 | } |
| 1012 | } |
| 1013 | |
| 1014 | sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); |
| 1015 | sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); |
| 1016 | |
| 1017 | sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb); |
| 1018 | if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0) |
| 1019 | goto cantfind_ext2; |
| 1020 | sbi->s_itb_per_group = sbi->s_inodes_per_group / |
| 1021 | sbi->s_inodes_per_block; |
| 1022 | sbi->s_desc_per_block = sb->s_blocksize / |
| 1023 | sizeof (struct ext2_group_desc); |
| 1024 | sbi->s_sbh = bh; |
| 1025 | sbi->s_mount_state = le16_to_cpu(es->s_state); |
| 1026 | sbi->s_addr_per_block_bits = |
| 1027 | ilog2 (EXT2_ADDR_PER_BLOCK(sb)); |
| 1028 | sbi->s_desc_per_block_bits = |
| 1029 | ilog2 (EXT2_DESC_PER_BLOCK(sb)); |
| 1030 | |
| 1031 | if (sb->s_magic != EXT2_SUPER_MAGIC) |
| 1032 | goto cantfind_ext2; |
| 1033 | |
| 1034 | if (sb->s_blocksize != bh->b_size) { |
| 1035 | if (!silent) |
| 1036 | ext2_msg(sb, KERN_ERR, "error: unsupported blocksize"); |
| 1037 | goto failed_mount; |
| 1038 | } |
| 1039 | |
| 1040 | if (es->s_log_frag_size != es->s_log_block_size) { |
| 1041 | ext2_msg(sb, KERN_ERR, |
| 1042 | "error: fragsize log %u != blocksize log %u", |
| 1043 | le32_to_cpu(es->s_log_frag_size), sb->s_blocksize_bits); |
| 1044 | goto failed_mount; |
| 1045 | } |
| 1046 | |
| 1047 | if (sbi->s_blocks_per_group > sb->s_blocksize * 8) { |
| 1048 | ext2_msg(sb, KERN_ERR, |
| 1049 | "error: #blocks per group too big: %lu", |
| 1050 | sbi->s_blocks_per_group); |
| 1051 | goto failed_mount; |
| 1052 | } |
| 1053 | /* At least inode table, bitmaps, and sb have to fit in one group */ |
| 1054 | if (sbi->s_blocks_per_group <= sbi->s_itb_per_group + 3) { |
| 1055 | ext2_msg(sb, KERN_ERR, |
| 1056 | "error: #blocks per group smaller than metadata size: %lu <= %lu", |
| 1057 | sbi->s_blocks_per_group, sbi->s_inodes_per_group + 3); |
| 1058 | goto failed_mount; |
| 1059 | } |
| 1060 | if (sbi->s_inodes_per_group < sbi->s_inodes_per_block || |
| 1061 | sbi->s_inodes_per_group > sb->s_blocksize * 8) { |
| 1062 | ext2_msg(sb, KERN_ERR, |
| 1063 | "error: invalid #inodes per group: %lu", |
| 1064 | sbi->s_inodes_per_group); |
| 1065 | goto failed_mount; |
| 1066 | } |
| 1067 | if (sb_bdev_nr_blocks(sb) < le32_to_cpu(es->s_blocks_count)) { |
| 1068 | ext2_msg(sb, KERN_ERR, |
| 1069 | "bad geometry: block count %u exceeds size of device (%u blocks)", |
| 1070 | le32_to_cpu(es->s_blocks_count), |
| 1071 | (unsigned)sb_bdev_nr_blocks(sb)); |
| 1072 | goto failed_mount; |
| 1073 | } |
| 1074 | |
| 1075 | sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) - |
| 1076 | le32_to_cpu(es->s_first_data_block) - 1) |
| 1077 | / EXT2_BLOCKS_PER_GROUP(sb)) + 1; |
| 1078 | if ((u64)sbi->s_groups_count * sbi->s_inodes_per_group != |
| 1079 | le32_to_cpu(es->s_inodes_count)) { |
| 1080 | ext2_msg(sb, KERN_ERR, "error: invalid #inodes: %u vs computed %llu", |
| 1081 | le32_to_cpu(es->s_inodes_count), |
| 1082 | (u64)sbi->s_groups_count * sbi->s_inodes_per_group); |
| 1083 | goto failed_mount; |
| 1084 | } |
| 1085 | db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) / |
| 1086 | EXT2_DESC_PER_BLOCK(sb); |
| 1087 | sbi->s_group_desc = kvmalloc_array(db_count, |
| 1088 | sizeof(struct buffer_head *), |
| 1089 | GFP_KERNEL); |
| 1090 | if (sbi->s_group_desc == NULL) { |
| 1091 | ret = -ENOMEM; |
| 1092 | ext2_msg(sb, KERN_ERR, "error: not enough memory"); |
| 1093 | goto failed_mount; |
| 1094 | } |
| 1095 | bgl_lock_init(sbi->s_blockgroup_lock); |
| 1096 | sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL); |
| 1097 | if (!sbi->s_debts) { |
| 1098 | ret = -ENOMEM; |
| 1099 | ext2_msg(sb, KERN_ERR, "error: not enough memory"); |
| 1100 | goto failed_mount_group_desc; |
| 1101 | } |
| 1102 | for (i = 0; i < db_count; i++) { |
| 1103 | block = descriptor_loc(sb, logic_sb_block, i); |
| 1104 | sbi->s_group_desc[i] = sb_bread(sb, block); |
| 1105 | if (!sbi->s_group_desc[i]) { |
| 1106 | for (j = 0; j < i; j++) |
| 1107 | brelse (sbi->s_group_desc[j]); |
| 1108 | ext2_msg(sb, KERN_ERR, |
| 1109 | "error: unable to read group descriptors"); |
| 1110 | goto failed_mount_group_desc; |
| 1111 | } |
| 1112 | } |
| 1113 | if (!ext2_check_descriptors (sb)) { |
| 1114 | ext2_msg(sb, KERN_ERR, "group descriptors corrupted"); |
| 1115 | goto failed_mount2; |
| 1116 | } |
| 1117 | sbi->s_gdb_count = db_count; |
| 1118 | get_random_bytes(&sbi->s_next_generation, sizeof(u32)); |
| 1119 | spin_lock_init(&sbi->s_next_gen_lock); |
| 1120 | |
| 1121 | /* per filesystem reservation list head & lock */ |
| 1122 | spin_lock_init(&sbi->s_rsv_window_lock); |
| 1123 | sbi->s_rsv_window_root = RB_ROOT; |
| 1124 | /* |
| 1125 | * Add a single, static dummy reservation to the start of the |
| 1126 | * reservation window list --- it gives us a placeholder for |
| 1127 | * append-at-start-of-list which makes the allocation logic |
| 1128 | * _much_ simpler. |
| 1129 | */ |
| 1130 | sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; |
| 1131 | sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; |
| 1132 | sbi->s_rsv_window_head.rsv_alloc_hit = 0; |
| 1133 | sbi->s_rsv_window_head.rsv_goal_size = 0; |
| 1134 | ext2_rsv_window_add(sb, &sbi->s_rsv_window_head); |
| 1135 | |
| 1136 | err = percpu_counter_init(&sbi->s_freeblocks_counter, |
| 1137 | ext2_count_free_blocks(sb), GFP_KERNEL); |
| 1138 | if (!err) { |
| 1139 | err = percpu_counter_init(&sbi->s_freeinodes_counter, |
| 1140 | ext2_count_free_inodes(sb), GFP_KERNEL); |
| 1141 | } |
| 1142 | if (!err) { |
| 1143 | err = percpu_counter_init(&sbi->s_dirs_counter, |
| 1144 | ext2_count_dirs(sb), GFP_KERNEL); |
| 1145 | } |
| 1146 | if (err) { |
| 1147 | ret = err; |
| 1148 | ext2_msg(sb, KERN_ERR, "error: insufficient memory"); |
| 1149 | goto failed_mount3; |
| 1150 | } |
| 1151 | |
| 1152 | #ifdef CONFIG_EXT2_FS_XATTR |
| 1153 | sbi->s_ea_block_cache = ext2_xattr_create_cache(); |
| 1154 | if (!sbi->s_ea_block_cache) { |
| 1155 | ret = -ENOMEM; |
| 1156 | ext2_msg(sb, KERN_ERR, "Failed to create ea_block_cache"); |
| 1157 | goto failed_mount3; |
| 1158 | } |
| 1159 | #endif |
| 1160 | /* |
| 1161 | * set up enough so that it can read an inode |
| 1162 | */ |
| 1163 | sb->s_op = &ext2_sops; |
| 1164 | sb->s_export_op = &ext2_export_ops; |
| 1165 | sb->s_xattr = ext2_xattr_handlers; |
| 1166 | |
| 1167 | #ifdef CONFIG_QUOTA |
| 1168 | sb->dq_op = &dquot_operations; |
| 1169 | sb->s_qcop = &ext2_quotactl_ops; |
| 1170 | sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; |
| 1171 | #endif |
| 1172 | |
| 1173 | root = ext2_iget(sb, EXT2_ROOT_INO); |
| 1174 | if (IS_ERR(root)) { |
| 1175 | ret = PTR_ERR(root); |
| 1176 | goto failed_mount3; |
| 1177 | } |
| 1178 | if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { |
| 1179 | iput(root); |
| 1180 | ext2_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck"); |
| 1181 | goto failed_mount3; |
| 1182 | } |
| 1183 | |
| 1184 | sb->s_root = d_make_root(root); |
| 1185 | if (!sb->s_root) { |
| 1186 | ext2_msg(sb, KERN_ERR, "error: get root inode failed"); |
| 1187 | ret = -ENOMEM; |
| 1188 | goto failed_mount3; |
| 1189 | } |
| 1190 | if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) |
| 1191 | ext2_msg(sb, KERN_WARNING, |
| 1192 | "warning: mounting ext3 filesystem as ext2"); |
| 1193 | if (ext2_setup_super (sb, es, sb_rdonly(sb))) |
| 1194 | sb->s_flags |= SB_RDONLY; |
| 1195 | ext2_write_super(sb); |
| 1196 | return 0; |
| 1197 | |
| 1198 | cantfind_ext2: |
| 1199 | if (!silent) |
| 1200 | ext2_msg(sb, KERN_ERR, |
| 1201 | "error: can't find an ext2 filesystem on dev %s.", |
| 1202 | sb->s_id); |
| 1203 | goto failed_mount; |
| 1204 | failed_mount3: |
| 1205 | ext2_xattr_destroy_cache(sbi->s_ea_block_cache); |
| 1206 | percpu_counter_destroy(&sbi->s_freeblocks_counter); |
| 1207 | percpu_counter_destroy(&sbi->s_freeinodes_counter); |
| 1208 | percpu_counter_destroy(&sbi->s_dirs_counter); |
| 1209 | failed_mount2: |
| 1210 | for (i = 0; i < db_count; i++) |
| 1211 | brelse(sbi->s_group_desc[i]); |
| 1212 | failed_mount_group_desc: |
| 1213 | kvfree(sbi->s_group_desc); |
| 1214 | kfree(sbi->s_debts); |
| 1215 | failed_mount: |
| 1216 | brelse(bh); |
| 1217 | failed_sbi: |
| 1218 | fs_put_dax(sbi->s_daxdev, NULL); |
| 1219 | sb->s_fs_info = NULL; |
| 1220 | kfree(sbi->s_blockgroup_lock); |
| 1221 | kfree(sbi); |
| 1222 | return ret; |
| 1223 | } |
| 1224 | |
| 1225 | static void ext2_clear_super_error(struct super_block *sb) |
| 1226 | { |
| 1227 | struct buffer_head *sbh = EXT2_SB(sb)->s_sbh; |
| 1228 | |
| 1229 | if (buffer_write_io_error(sbh)) { |
| 1230 | /* |
| 1231 | * Oh, dear. A previous attempt to write the |
| 1232 | * superblock failed. This could happen because the |
| 1233 | * USB device was yanked out. Or it could happen to |
| 1234 | * be a transient write error and maybe the block will |
| 1235 | * be remapped. Nothing we can do but to retry the |
| 1236 | * write and hope for the best. |
| 1237 | */ |
| 1238 | ext2_msg(sb, KERN_ERR, |
| 1239 | "previous I/O error to superblock detected"); |
| 1240 | clear_buffer_write_io_error(sbh); |
| 1241 | set_buffer_uptodate(sbh); |
| 1242 | } |
| 1243 | } |
| 1244 | |
| 1245 | void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es, |
| 1246 | int wait) |
| 1247 | { |
| 1248 | ext2_clear_super_error(sb); |
| 1249 | spin_lock(&EXT2_SB(sb)->s_lock); |
| 1250 | es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb)); |
| 1251 | es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb)); |
| 1252 | es->s_wtime = cpu_to_le32(ktime_get_real_seconds()); |
| 1253 | /* unlock before we do IO */ |
| 1254 | spin_unlock(&EXT2_SB(sb)->s_lock); |
| 1255 | mark_buffer_dirty(EXT2_SB(sb)->s_sbh); |
| 1256 | if (wait) |
| 1257 | sync_dirty_buffer(EXT2_SB(sb)->s_sbh); |
| 1258 | } |
| 1259 | |
| 1260 | /* |
| 1261 | * In the second extended file system, it is not necessary to |
| 1262 | * write the super block since we use a mapping of the |
| 1263 | * disk super block in a buffer. |
| 1264 | * |
| 1265 | * However, this function is still used to set the fs valid |
| 1266 | * flags to 0. We need to set this flag to 0 since the fs |
| 1267 | * may have been checked while mounted and e2fsck may have |
| 1268 | * set s_state to EXT2_VALID_FS after some corrections. |
| 1269 | */ |
| 1270 | static int ext2_sync_fs(struct super_block *sb, int wait) |
| 1271 | { |
| 1272 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
| 1273 | struct ext2_super_block *es = EXT2_SB(sb)->s_es; |
| 1274 | |
| 1275 | /* |
| 1276 | * Write quota structures to quota file, sync_blockdev() will write |
| 1277 | * them to disk later |
| 1278 | */ |
| 1279 | dquot_writeback_dquots(sb, -1); |
| 1280 | |
| 1281 | spin_lock(&sbi->s_lock); |
| 1282 | if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) { |
| 1283 | ext2_debug("setting valid to 0\n"); |
| 1284 | es->s_state &= cpu_to_le16(~EXT2_VALID_FS); |
| 1285 | } |
| 1286 | spin_unlock(&sbi->s_lock); |
| 1287 | ext2_sync_super(sb, es, wait); |
| 1288 | return 0; |
| 1289 | } |
| 1290 | |
| 1291 | static int ext2_freeze(struct super_block *sb) |
| 1292 | { |
| 1293 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
| 1294 | |
| 1295 | /* |
| 1296 | * Open but unlinked files present? Keep EXT2_VALID_FS flag cleared |
| 1297 | * because we have unattached inodes and thus filesystem is not fully |
| 1298 | * consistent. |
| 1299 | */ |
| 1300 | if (atomic_long_read(&sb->s_remove_count)) { |
| 1301 | ext2_sync_fs(sb, 1); |
| 1302 | return 0; |
| 1303 | } |
| 1304 | /* Set EXT2_FS_VALID flag */ |
| 1305 | spin_lock(&sbi->s_lock); |
| 1306 | sbi->s_es->s_state = cpu_to_le16(sbi->s_mount_state); |
| 1307 | spin_unlock(&sbi->s_lock); |
| 1308 | ext2_sync_super(sb, sbi->s_es, 1); |
| 1309 | |
| 1310 | return 0; |
| 1311 | } |
| 1312 | |
| 1313 | static int ext2_unfreeze(struct super_block *sb) |
| 1314 | { |
| 1315 | /* Just write sb to clear EXT2_VALID_FS flag */ |
| 1316 | ext2_write_super(sb); |
| 1317 | |
| 1318 | return 0; |
| 1319 | } |
| 1320 | |
| 1321 | static void ext2_write_super(struct super_block *sb) |
| 1322 | { |
| 1323 | if (!sb_rdonly(sb)) |
| 1324 | ext2_sync_fs(sb, 1); |
| 1325 | } |
| 1326 | |
| 1327 | static int ext2_remount (struct super_block * sb, int * flags, char * data) |
| 1328 | { |
| 1329 | struct ext2_sb_info * sbi = EXT2_SB(sb); |
| 1330 | struct ext2_super_block * es; |
| 1331 | struct ext2_mount_options new_opts; |
| 1332 | int err; |
| 1333 | |
| 1334 | sync_filesystem(sb); |
| 1335 | |
| 1336 | spin_lock(&sbi->s_lock); |
| 1337 | new_opts.s_mount_opt = sbi->s_mount_opt; |
| 1338 | new_opts.s_resuid = sbi->s_resuid; |
| 1339 | new_opts.s_resgid = sbi->s_resgid; |
| 1340 | spin_unlock(&sbi->s_lock); |
| 1341 | |
| 1342 | if (!parse_options(data, sb, &new_opts)) |
| 1343 | return -EINVAL; |
| 1344 | |
| 1345 | spin_lock(&sbi->s_lock); |
| 1346 | es = sbi->s_es; |
| 1347 | if ((sbi->s_mount_opt ^ new_opts.s_mount_opt) & EXT2_MOUNT_DAX) { |
| 1348 | ext2_msg(sb, KERN_WARNING, "warning: refusing change of " |
| 1349 | "dax flag with busy inodes while remounting"); |
| 1350 | new_opts.s_mount_opt ^= EXT2_MOUNT_DAX; |
| 1351 | } |
| 1352 | if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb)) |
| 1353 | goto out_set; |
| 1354 | if (*flags & SB_RDONLY) { |
| 1355 | if (le16_to_cpu(es->s_state) & EXT2_VALID_FS || |
| 1356 | !(sbi->s_mount_state & EXT2_VALID_FS)) |
| 1357 | goto out_set; |
| 1358 | |
| 1359 | /* |
| 1360 | * OK, we are remounting a valid rw partition rdonly, so set |
| 1361 | * the rdonly flag and then mark the partition as valid again. |
| 1362 | */ |
| 1363 | es->s_state = cpu_to_le16(sbi->s_mount_state); |
| 1364 | es->s_mtime = cpu_to_le32(ktime_get_real_seconds()); |
| 1365 | spin_unlock(&sbi->s_lock); |
| 1366 | |
| 1367 | err = dquot_suspend(sb, -1); |
| 1368 | if (err < 0) |
| 1369 | return err; |
| 1370 | |
| 1371 | ext2_sync_super(sb, es, 1); |
| 1372 | } else { |
| 1373 | __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb, |
| 1374 | ~EXT2_FEATURE_RO_COMPAT_SUPP); |
| 1375 | if (ret) { |
| 1376 | spin_unlock(&sbi->s_lock); |
| 1377 | ext2_msg(sb, KERN_WARNING, |
| 1378 | "warning: couldn't remount RDWR because of " |
| 1379 | "unsupported optional features (%x).", |
| 1380 | le32_to_cpu(ret)); |
| 1381 | return -EROFS; |
| 1382 | } |
| 1383 | /* |
| 1384 | * Mounting a RDONLY partition read-write, so reread and |
| 1385 | * store the current valid flag. (It may have been changed |
| 1386 | * by e2fsck since we originally mounted the partition.) |
| 1387 | */ |
| 1388 | sbi->s_mount_state = le16_to_cpu(es->s_state); |
| 1389 | if (!ext2_setup_super (sb, es, 0)) |
| 1390 | sb->s_flags &= ~SB_RDONLY; |
| 1391 | spin_unlock(&sbi->s_lock); |
| 1392 | |
| 1393 | ext2_write_super(sb); |
| 1394 | |
| 1395 | dquot_resume(sb, -1); |
| 1396 | } |
| 1397 | |
| 1398 | spin_lock(&sbi->s_lock); |
| 1399 | out_set: |
| 1400 | sbi->s_mount_opt = new_opts.s_mount_opt; |
| 1401 | sbi->s_resuid = new_opts.s_resuid; |
| 1402 | sbi->s_resgid = new_opts.s_resgid; |
| 1403 | sb->s_flags = (sb->s_flags & ~SB_POSIXACL) | |
| 1404 | (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0); |
| 1405 | spin_unlock(&sbi->s_lock); |
| 1406 | |
| 1407 | return 0; |
| 1408 | } |
| 1409 | |
| 1410 | static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf) |
| 1411 | { |
| 1412 | struct super_block *sb = dentry->d_sb; |
| 1413 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
| 1414 | struct ext2_super_block *es = sbi->s_es; |
| 1415 | |
| 1416 | spin_lock(&sbi->s_lock); |
| 1417 | |
| 1418 | if (test_opt (sb, MINIX_DF)) |
| 1419 | sbi->s_overhead_last = 0; |
| 1420 | else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) { |
| 1421 | unsigned long i, overhead = 0; |
| 1422 | smp_rmb(); |
| 1423 | |
| 1424 | /* |
| 1425 | * Compute the overhead (FS structures). This is constant |
| 1426 | * for a given filesystem unless the number of block groups |
| 1427 | * changes so we cache the previous value until it does. |
| 1428 | */ |
| 1429 | |
| 1430 | /* |
| 1431 | * All of the blocks before first_data_block are |
| 1432 | * overhead |
| 1433 | */ |
| 1434 | overhead = le32_to_cpu(es->s_first_data_block); |
| 1435 | |
| 1436 | /* |
| 1437 | * Add the overhead attributed to the superblock and |
| 1438 | * block group descriptors. If the sparse superblocks |
| 1439 | * feature is turned on, then not all groups have this. |
| 1440 | */ |
| 1441 | for (i = 0; i < sbi->s_groups_count; i++) |
| 1442 | overhead += ext2_bg_has_super(sb, i) + |
| 1443 | ext2_bg_num_gdb(sb, i); |
| 1444 | |
| 1445 | /* |
| 1446 | * Every block group has an inode bitmap, a block |
| 1447 | * bitmap, and an inode table. |
| 1448 | */ |
| 1449 | overhead += (sbi->s_groups_count * |
| 1450 | (2 + sbi->s_itb_per_group)); |
| 1451 | sbi->s_overhead_last = overhead; |
| 1452 | smp_wmb(); |
| 1453 | sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count); |
| 1454 | } |
| 1455 | |
| 1456 | buf->f_type = EXT2_SUPER_MAGIC; |
| 1457 | buf->f_bsize = sb->s_blocksize; |
| 1458 | buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last; |
| 1459 | buf->f_bfree = ext2_count_free_blocks(sb); |
| 1460 | es->s_free_blocks_count = cpu_to_le32(buf->f_bfree); |
| 1461 | buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count); |
| 1462 | if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count)) |
| 1463 | buf->f_bavail = 0; |
| 1464 | buf->f_files = le32_to_cpu(es->s_inodes_count); |
| 1465 | buf->f_ffree = ext2_count_free_inodes(sb); |
| 1466 | es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); |
| 1467 | buf->f_namelen = EXT2_NAME_LEN; |
| 1468 | buf->f_fsid = uuid_to_fsid(es->s_uuid); |
| 1469 | spin_unlock(&sbi->s_lock); |
| 1470 | return 0; |
| 1471 | } |
| 1472 | |
| 1473 | static struct dentry *ext2_mount(struct file_system_type *fs_type, |
| 1474 | int flags, const char *dev_name, void *data) |
| 1475 | { |
| 1476 | return mount_bdev(fs_type, flags, dev_name, data, ext2_fill_super); |
| 1477 | } |
| 1478 | |
| 1479 | #ifdef CONFIG_QUOTA |
| 1480 | |
| 1481 | /* Read data from quotafile - avoid pagecache and such because we cannot afford |
| 1482 | * acquiring the locks... As quota files are never truncated and quota code |
| 1483 | * itself serializes the operations (and no one else should touch the files) |
| 1484 | * we don't have to be afraid of races */ |
| 1485 | static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, |
| 1486 | size_t len, loff_t off) |
| 1487 | { |
| 1488 | struct inode *inode = sb_dqopt(sb)->files[type]; |
| 1489 | sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); |
| 1490 | int err = 0; |
| 1491 | int offset = off & (sb->s_blocksize - 1); |
| 1492 | int tocopy; |
| 1493 | size_t toread; |
| 1494 | struct buffer_head tmp_bh; |
| 1495 | struct buffer_head *bh; |
| 1496 | loff_t i_size = i_size_read(inode); |
| 1497 | |
| 1498 | if (off > i_size) |
| 1499 | return 0; |
| 1500 | if (off+len > i_size) |
| 1501 | len = i_size-off; |
| 1502 | toread = len; |
| 1503 | while (toread > 0) { |
| 1504 | tocopy = min_t(size_t, sb->s_blocksize - offset, toread); |
| 1505 | |
| 1506 | tmp_bh.b_state = 0; |
| 1507 | tmp_bh.b_size = sb->s_blocksize; |
| 1508 | err = ext2_get_block(inode, blk, &tmp_bh, 0); |
| 1509 | if (err < 0) |
| 1510 | return err; |
| 1511 | if (!buffer_mapped(&tmp_bh)) /* A hole? */ |
| 1512 | memset(data, 0, tocopy); |
| 1513 | else { |
| 1514 | bh = sb_bread(sb, tmp_bh.b_blocknr); |
| 1515 | if (!bh) |
| 1516 | return -EIO; |
| 1517 | memcpy(data, bh->b_data+offset, tocopy); |
| 1518 | brelse(bh); |
| 1519 | } |
| 1520 | offset = 0; |
| 1521 | toread -= tocopy; |
| 1522 | data += tocopy; |
| 1523 | blk++; |
| 1524 | } |
| 1525 | return len; |
| 1526 | } |
| 1527 | |
| 1528 | /* Write to quotafile */ |
| 1529 | static ssize_t ext2_quota_write(struct super_block *sb, int type, |
| 1530 | const char *data, size_t len, loff_t off) |
| 1531 | { |
| 1532 | struct inode *inode = sb_dqopt(sb)->files[type]; |
| 1533 | sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); |
| 1534 | int err = 0; |
| 1535 | int offset = off & (sb->s_blocksize - 1); |
| 1536 | int tocopy; |
| 1537 | size_t towrite = len; |
| 1538 | struct buffer_head tmp_bh; |
| 1539 | struct buffer_head *bh; |
| 1540 | |
| 1541 | while (towrite > 0) { |
| 1542 | tocopy = min_t(size_t, sb->s_blocksize - offset, towrite); |
| 1543 | |
| 1544 | tmp_bh.b_state = 0; |
| 1545 | tmp_bh.b_size = sb->s_blocksize; |
| 1546 | err = ext2_get_block(inode, blk, &tmp_bh, 1); |
| 1547 | if (err < 0) |
| 1548 | goto out; |
| 1549 | if (offset || tocopy != EXT2_BLOCK_SIZE(sb)) |
| 1550 | bh = sb_bread(sb, tmp_bh.b_blocknr); |
| 1551 | else |
| 1552 | bh = sb_getblk(sb, tmp_bh.b_blocknr); |
| 1553 | if (unlikely(!bh)) { |
| 1554 | err = -EIO; |
| 1555 | goto out; |
| 1556 | } |
| 1557 | lock_buffer(bh); |
| 1558 | memcpy(bh->b_data+offset, data, tocopy); |
| 1559 | flush_dcache_page(bh->b_page); |
| 1560 | set_buffer_uptodate(bh); |
| 1561 | mark_buffer_dirty(bh); |
| 1562 | unlock_buffer(bh); |
| 1563 | brelse(bh); |
| 1564 | offset = 0; |
| 1565 | towrite -= tocopy; |
| 1566 | data += tocopy; |
| 1567 | blk++; |
| 1568 | } |
| 1569 | out: |
| 1570 | if (len == towrite) |
| 1571 | return err; |
| 1572 | if (inode->i_size < off+len-towrite) |
| 1573 | i_size_write(inode, off+len-towrite); |
| 1574 | inode_inc_iversion(inode); |
| 1575 | inode_set_mtime_to_ts(inode, inode_set_ctime_current(inode)); |
| 1576 | mark_inode_dirty(inode); |
| 1577 | return len - towrite; |
| 1578 | } |
| 1579 | |
| 1580 | static int ext2_quota_on(struct super_block *sb, int type, int format_id, |
| 1581 | const struct path *path) |
| 1582 | { |
| 1583 | int err; |
| 1584 | struct inode *inode; |
| 1585 | |
| 1586 | err = dquot_quota_on(sb, type, format_id, path); |
| 1587 | if (err) |
| 1588 | return err; |
| 1589 | |
| 1590 | inode = d_inode(path->dentry); |
| 1591 | inode_lock(inode); |
| 1592 | EXT2_I(inode)->i_flags |= EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL; |
| 1593 | inode_set_flags(inode, S_NOATIME | S_IMMUTABLE, |
| 1594 | S_NOATIME | S_IMMUTABLE); |
| 1595 | inode_unlock(inode); |
| 1596 | mark_inode_dirty(inode); |
| 1597 | |
| 1598 | return 0; |
| 1599 | } |
| 1600 | |
| 1601 | static int ext2_quota_off(struct super_block *sb, int type) |
| 1602 | { |
| 1603 | struct inode *inode = sb_dqopt(sb)->files[type]; |
| 1604 | int err; |
| 1605 | |
| 1606 | if (!inode || !igrab(inode)) |
| 1607 | goto out; |
| 1608 | |
| 1609 | err = dquot_quota_off(sb, type); |
| 1610 | if (err) |
| 1611 | goto out_put; |
| 1612 | |
| 1613 | inode_lock(inode); |
| 1614 | EXT2_I(inode)->i_flags &= ~(EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL); |
| 1615 | inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE); |
| 1616 | inode_unlock(inode); |
| 1617 | mark_inode_dirty(inode); |
| 1618 | out_put: |
| 1619 | iput(inode); |
| 1620 | return err; |
| 1621 | out: |
| 1622 | return dquot_quota_off(sb, type); |
| 1623 | } |
| 1624 | |
| 1625 | #endif |
| 1626 | |
| 1627 | static struct file_system_type ext2_fs_type = { |
| 1628 | .owner = THIS_MODULE, |
| 1629 | .name = "ext2", |
| 1630 | .mount = ext2_mount, |
| 1631 | .kill_sb = kill_block_super, |
| 1632 | .fs_flags = FS_REQUIRES_DEV, |
| 1633 | }; |
| 1634 | MODULE_ALIAS_FS("ext2"); |
| 1635 | |
| 1636 | static int __init init_ext2_fs(void) |
| 1637 | { |
| 1638 | int err; |
| 1639 | |
| 1640 | err = init_inodecache(); |
| 1641 | if (err) |
| 1642 | return err; |
| 1643 | err = register_filesystem(&ext2_fs_type); |
| 1644 | if (err) |
| 1645 | goto out; |
| 1646 | return 0; |
| 1647 | out: |
| 1648 | destroy_inodecache(); |
| 1649 | return err; |
| 1650 | } |
| 1651 | |
| 1652 | static void __exit exit_ext2_fs(void) |
| 1653 | { |
| 1654 | unregister_filesystem(&ext2_fs_type); |
| 1655 | destroy_inodecache(); |
| 1656 | } |
| 1657 | |
| 1658 | MODULE_AUTHOR("Remy Card and others"); |
| 1659 | MODULE_DESCRIPTION("Second Extended Filesystem"); |
| 1660 | MODULE_LICENSE("GPL"); |
| 1661 | module_init(init_ext2_fs) |
| 1662 | module_exit(exit_ext2_fs) |