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Commit | Line | Data |
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09c434b8 | 1 | // SPDX-License-Identifier: GPL-2.0-only |
1da177e4 LT |
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 | ||
1da177e4 LT |
20 | #include <linux/module.h> |
21 | #include <linux/string.h> | |
8fc2751b | 22 | #include <linux/fs.h> |
1da177e4 LT |
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> | |
a5694255 | 29 | #include <linux/exportfs.h> |
1da177e4 | 30 | #include <linux/vfs.h> |
8fc2751b MB |
31 | #include <linux/seq_file.h> |
32 | #include <linux/mount.h> | |
d8ea6cf8 | 33 | #include <linux/log2.h> |
74abb989 | 34 | #include <linux/quotaops.h> |
7c0f6ba6 | 35 | #include <linux/uaccess.h> |
ef510424 | 36 | #include <linux/dax.h> |
e1d747d9 | 37 | #include <linux/iversion.h> |
1da177e4 LT |
38 | #include "ext2.h" |
39 | #include "xattr.h" | |
40 | #include "acl.h" | |
41 | ||
65547661 | 42 | static void ext2_write_super(struct super_block *sb); |
1da177e4 | 43 | static int ext2_remount (struct super_block * sb, int * flags, char * data); |
726c3342 | 44 | static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf); |
40f31dd4 | 45 | static int ext2_sync_fs(struct super_block *sb, int wait); |
1e8b212f JK |
46 | static int ext2_freeze(struct super_block *sb); |
47 | static int ext2_unfreeze(struct super_block *sb); | |
1da177e4 | 48 | |
23a2ad6d JP |
49 | void ext2_error(struct super_block *sb, const char *function, |
50 | const char *fmt, ...) | |
1da177e4 | 51 | { |
23a2ad6d | 52 | struct va_format vaf; |
1da177e4 LT |
53 | va_list args; |
54 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
55 | struct ext2_super_block *es = sbi->s_es; | |
56 | ||
bc98a42c | 57 | if (!sb_rdonly(sb)) { |
c15271f4 | 58 | spin_lock(&sbi->s_lock); |
1da177e4 | 59 | sbi->s_mount_state |= EXT2_ERROR_FS; |
31f68e13 | 60 | es->s_state |= cpu_to_le16(EXT2_ERROR_FS); |
c15271f4 | 61 | spin_unlock(&sbi->s_lock); |
ee6921eb | 62 | ext2_sync_super(sb, es, 1); |
1da177e4 LT |
63 | } |
64 | ||
65 | va_start(args, fmt); | |
23a2ad6d JP |
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 | ||
1da177e4 LT |
73 | va_end(args); |
74 | ||
75 | if (test_opt(sb, ERRORS_PANIC)) | |
2314b07c | 76 | panic("EXT2-fs: panic from previous error\n"); |
c0ed7b51 | 77 | if (!sb_rdonly(sb) && test_opt(sb, ERRORS_RO)) { |
2314b07c OR |
78 | ext2_msg(sb, KERN_CRIT, |
79 | "error: remounting filesystem read-only"); | |
1751e8a6 | 80 | sb->s_flags |= SB_RDONLY; |
1da177e4 LT |
81 | } |
82 | } | |
83 | ||
2314b07c OR |
84 | void ext2_msg(struct super_block *sb, const char *prefix, |
85 | const char *fmt, ...) | |
1da177e4 | 86 | { |
23a2ad6d | 87 | struct va_format vaf; |
1da177e4 LT |
88 | va_list args; |
89 | ||
90 | va_start(args, fmt); | |
23a2ad6d JP |
91 | |
92 | vaf.fmt = fmt; | |
93 | vaf.va = &args; | |
94 | ||
95 | printk("%sEXT2-fs (%s): %pV\n", prefix, sb->s_id, &vaf); | |
96 | ||
1da177e4 LT |
97 | va_end(args); |
98 | } | |
99 | ||
c15271f4 JB |
100 | /* |
101 | * This must be called with sbi->s_lock held. | |
102 | */ | |
1da177e4 LT |
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 | ||
2314b07c OR |
110 | ext2_msg(sb, KERN_WARNING, |
111 | "warning: updating to rev %d because of " | |
112 | "new feature flag, running e2fsck is recommended", | |
1da177e4 LT |
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 | ||
161f3b74 JK |
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 | ||
1da177e4 LT |
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 | ||
161f3b74 | 150 | ext2_quota_off_umount(sb); |
e0ccfd95 | 151 | |
569ae920 CX |
152 | ext2_xattr_destroy_cache(sbi->s_ea_block_cache); |
153 | sbi->s_ea_block_cache = NULL; | |
154 | ||
bc98a42c | 155 | if (!sb_rdonly(sb)) { |
1da177e4 LT |
156 | struct ext2_super_block *es = sbi->s_es; |
157 | ||
c15271f4 | 158 | spin_lock(&sbi->s_lock); |
1da177e4 | 159 | es->s_state = cpu_to_le16(sbi->s_mount_state); |
c15271f4 | 160 | spin_unlock(&sbi->s_lock); |
ee6921eb | 161 | ext2_sync_super(sb, es, 1); |
1da177e4 LT |
162 | } |
163 | db_count = sbi->s_gdb_count; | |
164 | for (i = 0; i < db_count; i++) | |
18c2433c | 165 | brelse(sbi->s_group_desc[i]); |
1da177e4 LT |
166 | kfree(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; | |
18a82eb9 | 173 | kfree(sbi->s_blockgroup_lock); |
8cf037a8 | 174 | fs_put_dax(sbi->s_daxdev); |
1da177e4 | 175 | kfree(sbi); |
1da177e4 LT |
176 | } |
177 | ||
e18b890b | 178 | static struct kmem_cache * ext2_inode_cachep; |
1da177e4 LT |
179 | |
180 | static struct inode *ext2_alloc_inode(struct super_block *sb) | |
181 | { | |
182 | struct ext2_inode_info *ei; | |
e625b310 | 183 | ei = kmem_cache_alloc(ext2_inode_cachep, GFP_KERNEL); |
1da177e4 LT |
184 | if (!ei) |
185 | return NULL; | |
a686cd89 | 186 | ei->i_block_alloc_info = NULL; |
e1d747d9 | 187 | inode_set_iversion(&ei->vfs_inode, 1); |
64241118 JK |
188 | #ifdef CONFIG_QUOTA |
189 | memset(&ei->i_dquot, 0, sizeof(ei->i_dquot)); | |
190 | #endif | |
191 | ||
1da177e4 LT |
192 | return &ei->vfs_inode; |
193 | } | |
194 | ||
a2d1b88b | 195 | static void ext2_free_in_core_inode(struct inode *inode) |
1da177e4 LT |
196 | { |
197 | kmem_cache_free(ext2_inode_cachep, EXT2_I(inode)); | |
198 | } | |
199 | ||
51cc5068 | 200 | static void init_once(void *foo) |
1da177e4 LT |
201 | { |
202 | struct ext2_inode_info *ei = (struct ext2_inode_info *) foo; | |
203 | ||
a35afb83 | 204 | rwlock_init(&ei->i_meta_lock); |
1da177e4 | 205 | #ifdef CONFIG_EXT2_FS_XATTR |
a35afb83 | 206 | init_rwsem(&ei->xattr_sem); |
1da177e4 | 207 | #endif |
a686cd89 | 208 | mutex_init(&ei->truncate_mutex); |
a35afb83 | 209 | inode_init_once(&ei->vfs_inode); |
1da177e4 | 210 | } |
20c2df83 | 211 | |
0903353a | 212 | static int __init init_inodecache(void) |
1da177e4 | 213 | { |
85212d4e DW |
214 | ext2_inode_cachep = kmem_cache_create_usercopy("ext2_inode_cache", |
215 | sizeof(struct ext2_inode_info), 0, | |
216 | (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD| | |
217 | SLAB_ACCOUNT), | |
218 | offsetof(struct ext2_inode_info, i_data), | |
219 | sizeof_field(struct ext2_inode_info, i_data), | |
220 | init_once); | |
1da177e4 LT |
221 | if (ext2_inode_cachep == NULL) |
222 | return -ENOMEM; | |
223 | return 0; | |
224 | } | |
225 | ||
226 | static void destroy_inodecache(void) | |
227 | { | |
8c0a8537 KS |
228 | /* |
229 | * Make sure all delayed rcu free inodes are flushed before we | |
230 | * destroy cache. | |
231 | */ | |
232 | rcu_barrier(); | |
1a1d92c1 | 233 | kmem_cache_destroy(ext2_inode_cachep); |
1da177e4 LT |
234 | } |
235 | ||
34c80b1d | 236 | static int ext2_show_options(struct seq_file *seq, struct dentry *root) |
8fc2751b | 237 | { |
34c80b1d | 238 | struct super_block *sb = root->d_sb; |
93d44cb2 MS |
239 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
240 | struct ext2_super_block *es = sbi->s_es; | |
241 | unsigned long def_mount_opts; | |
8fc2751b | 242 | |
c15271f4 | 243 | spin_lock(&sbi->s_lock); |
93d44cb2 MS |
244 | def_mount_opts = le32_to_cpu(es->s_default_mount_opts); |
245 | ||
246 | if (sbi->s_sb_block != 1) | |
247 | seq_printf(seq, ",sb=%lu", sbi->s_sb_block); | |
248 | if (test_opt(sb, MINIX_DF)) | |
249 | seq_puts(seq, ",minixdf"); | |
250 | if (test_opt(sb, GRPID)) | |
8fc2751b | 251 | seq_puts(seq, ",grpid"); |
93d44cb2 MS |
252 | if (!test_opt(sb, GRPID) && (def_mount_opts & EXT2_DEFM_BSDGROUPS)) |
253 | seq_puts(seq, ",nogrpid"); | |
b8a9f9e1 | 254 | if (!uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT2_DEF_RESUID)) || |
93d44cb2 | 255 | le16_to_cpu(es->s_def_resuid) != EXT2_DEF_RESUID) { |
b8a9f9e1 EB |
256 | seq_printf(seq, ",resuid=%u", |
257 | from_kuid_munged(&init_user_ns, sbi->s_resuid)); | |
93d44cb2 | 258 | } |
b8a9f9e1 | 259 | if (!gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT2_DEF_RESGID)) || |
93d44cb2 | 260 | le16_to_cpu(es->s_def_resgid) != EXT2_DEF_RESGID) { |
b8a9f9e1 EB |
261 | seq_printf(seq, ",resgid=%u", |
262 | from_kgid_munged(&init_user_ns, sbi->s_resgid)); | |
93d44cb2 | 263 | } |
14e11e10 | 264 | if (test_opt(sb, ERRORS_RO)) { |
93d44cb2 MS |
265 | int def_errors = le16_to_cpu(es->s_errors); |
266 | ||
267 | if (def_errors == EXT2_ERRORS_PANIC || | |
14e11e10 AK |
268 | def_errors == EXT2_ERRORS_CONTINUE) { |
269 | seq_puts(seq, ",errors=remount-ro"); | |
93d44cb2 MS |
270 | } |
271 | } | |
14e11e10 AK |
272 | if (test_opt(sb, ERRORS_CONT)) |
273 | seq_puts(seq, ",errors=continue"); | |
93d44cb2 MS |
274 | if (test_opt(sb, ERRORS_PANIC)) |
275 | seq_puts(seq, ",errors=panic"); | |
276 | if (test_opt(sb, NO_UID32)) | |
277 | seq_puts(seq, ",nouid32"); | |
278 | if (test_opt(sb, DEBUG)) | |
279 | seq_puts(seq, ",debug"); | |
280 | if (test_opt(sb, OLDALLOC)) | |
281 | seq_puts(seq, ",oldalloc"); | |
282 | ||
283 | #ifdef CONFIG_EXT2_FS_XATTR | |
284 | if (test_opt(sb, XATTR_USER)) | |
285 | seq_puts(seq, ",user_xattr"); | |
286 | if (!test_opt(sb, XATTR_USER) && | |
287 | (def_mount_opts & EXT2_DEFM_XATTR_USER)) { | |
288 | seq_puts(seq, ",nouser_xattr"); | |
289 | } | |
290 | #endif | |
291 | ||
292 | #ifdef CONFIG_EXT2_FS_POSIX_ACL | |
293 | if (test_opt(sb, POSIX_ACL)) | |
294 | seq_puts(seq, ",acl"); | |
295 | if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT2_DEFM_ACL)) | |
296 | seq_puts(seq, ",noacl"); | |
297 | #endif | |
298 | ||
299 | if (test_opt(sb, NOBH)) | |
300 | seq_puts(seq, ",nobh"); | |
8fc2751b | 301 | |
38fa0e8e | 302 | if (test_opt(sb, USRQUOTA)) |
8fc2751b MB |
303 | seq_puts(seq, ",usrquota"); |
304 | ||
38fa0e8e | 305 | if (test_opt(sb, GRPQUOTA)) |
8fc2751b | 306 | seq_puts(seq, ",grpquota"); |
8fc2751b | 307 | |
38fa0e8e | 308 | if (test_opt(sb, XIP)) |
83541796 | 309 | seq_puts(seq, ",xip"); |
2aad26fa | 310 | |
38fa0e8e | 311 | if (test_opt(sb, DAX)) |
9c3ce9ec | 312 | seq_puts(seq, ",dax"); |
83541796 | 313 | |
35c879dc MS |
314 | if (!test_opt(sb, RESERVATION)) |
315 | seq_puts(seq, ",noreservation"); | |
316 | ||
c15271f4 | 317 | spin_unlock(&sbi->s_lock); |
8fc2751b MB |
318 | return 0; |
319 | } | |
320 | ||
1da177e4 LT |
321 | #ifdef CONFIG_QUOTA |
322 | static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off); | |
323 | static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off); | |
161f3b74 JK |
324 | static int ext2_quota_on(struct super_block *sb, int type, int format_id, |
325 | const struct path *path); | |
64241118 JK |
326 | static struct dquot **ext2_get_dquots(struct inode *inode) |
327 | { | |
328 | return EXT2_I(inode)->i_dquot; | |
329 | } | |
161f3b74 JK |
330 | |
331 | static const struct quotactl_ops ext2_quotactl_ops = { | |
332 | .quota_on = ext2_quota_on, | |
333 | .quota_off = ext2_quota_off, | |
334 | .quota_sync = dquot_quota_sync, | |
335 | .get_state = dquot_get_state, | |
336 | .set_info = dquot_set_dqinfo, | |
337 | .get_dqblk = dquot_get_dqblk, | |
338 | .set_dqblk = dquot_set_dqblk, | |
339 | .get_nextdqblk = dquot_get_next_dqblk, | |
340 | }; | |
1da177e4 LT |
341 | #endif |
342 | ||
ee9b6d61 | 343 | static const struct super_operations ext2_sops = { |
1da177e4 | 344 | .alloc_inode = ext2_alloc_inode, |
a2d1b88b | 345 | .free_inode = ext2_free_in_core_inode, |
1da177e4 | 346 | .write_inode = ext2_write_inode, |
72edc4d0 | 347 | .evict_inode = ext2_evict_inode, |
1da177e4 | 348 | .put_super = ext2_put_super, |
40f31dd4 | 349 | .sync_fs = ext2_sync_fs, |
1e8b212f JK |
350 | .freeze_fs = ext2_freeze, |
351 | .unfreeze_fs = ext2_unfreeze, | |
1da177e4 LT |
352 | .statfs = ext2_statfs, |
353 | .remount_fs = ext2_remount, | |
8fc2751b | 354 | .show_options = ext2_show_options, |
1da177e4 LT |
355 | #ifdef CONFIG_QUOTA |
356 | .quota_read = ext2_quota_read, | |
357 | .quota_write = ext2_quota_write, | |
64241118 | 358 | .get_dquots = ext2_get_dquots, |
1da177e4 LT |
359 | #endif |
360 | }; | |
361 | ||
2e4c68e3 CH |
362 | static struct inode *ext2_nfs_get_inode(struct super_block *sb, |
363 | u64 ino, u32 generation) | |
ecaff756 | 364 | { |
ecaff756 | 365 | struct inode *inode; |
ecaff756 N |
366 | |
367 | if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO) | |
368 | return ERR_PTR(-ESTALE); | |
369 | if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count)) | |
370 | return ERR_PTR(-ESTALE); | |
371 | ||
f32948dd LH |
372 | /* |
373 | * ext2_iget isn't quite right if the inode is currently unallocated! | |
374 | * However ext2_iget currently does appropriate checks to handle stale | |
375 | * inodes so everything is OK. | |
ecaff756 | 376 | */ |
52fcf703 DH |
377 | inode = ext2_iget(sb, ino); |
378 | if (IS_ERR(inode)) | |
379 | return ERR_CAST(inode); | |
380 | if (generation && inode->i_generation != generation) { | |
ecaff756 N |
381 | /* we didn't find the right inode.. */ |
382 | iput(inode); | |
383 | return ERR_PTR(-ESTALE); | |
384 | } | |
2e4c68e3 CH |
385 | return inode; |
386 | } | |
387 | ||
388 | static struct dentry *ext2_fh_to_dentry(struct super_block *sb, struct fid *fid, | |
389 | int fh_len, int fh_type) | |
390 | { | |
391 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, | |
392 | ext2_nfs_get_inode); | |
393 | } | |
394 | ||
395 | static struct dentry *ext2_fh_to_parent(struct super_block *sb, struct fid *fid, | |
396 | int fh_len, int fh_type) | |
397 | { | |
398 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, | |
399 | ext2_nfs_get_inode); | |
ecaff756 N |
400 | } |
401 | ||
39655164 | 402 | static const struct export_operations ext2_export_ops = { |
2e4c68e3 CH |
403 | .fh_to_dentry = ext2_fh_to_dentry, |
404 | .fh_to_parent = ext2_fh_to_parent, | |
1da177e4 LT |
405 | .get_parent = ext2_get_parent, |
406 | }; | |
407 | ||
408 | static unsigned long get_sb_block(void **data) | |
409 | { | |
410 | unsigned long sb_block; | |
411 | char *options = (char *) *data; | |
412 | ||
413 | if (!options || strncmp(options, "sb=", 3) != 0) | |
414 | return 1; /* Default location */ | |
415 | options += 3; | |
416 | sb_block = simple_strtoul(options, &options, 0); | |
417 | if (*options && *options != ',') { | |
418 | printk("EXT2-fs: Invalid sb specification: %s\n", | |
419 | (char *) *data); | |
420 | return 1; | |
421 | } | |
422 | if (*options == ',') | |
423 | options++; | |
424 | *data = (void *) options; | |
425 | return sb_block; | |
426 | } | |
427 | ||
428 | enum { | |
429 | Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, | |
8fc2751b | 430 | Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, |
30b42a71 | 431 | Opt_err_ro, Opt_nouid32, Opt_debug, |
8fc2751b | 432 | Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr, |
9c3ce9ec | 433 | Opt_acl, Opt_noacl, Opt_xip, Opt_dax, Opt_ignore, Opt_err, Opt_quota, |
a686cd89 | 434 | Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation |
1da177e4 LT |
435 | }; |
436 | ||
a447c093 | 437 | static const match_table_t tokens = { |
1da177e4 LT |
438 | {Opt_bsd_df, "bsddf"}, |
439 | {Opt_minix_df, "minixdf"}, | |
440 | {Opt_grpid, "grpid"}, | |
441 | {Opt_grpid, "bsdgroups"}, | |
442 | {Opt_nogrpid, "nogrpid"}, | |
443 | {Opt_nogrpid, "sysvgroups"}, | |
444 | {Opt_resgid, "resgid=%u"}, | |
445 | {Opt_resuid, "resuid=%u"}, | |
446 | {Opt_sb, "sb=%u"}, | |
447 | {Opt_err_cont, "errors=continue"}, | |
448 | {Opt_err_panic, "errors=panic"}, | |
449 | {Opt_err_ro, "errors=remount-ro"}, | |
450 | {Opt_nouid32, "nouid32"}, | |
1da177e4 LT |
451 | {Opt_debug, "debug"}, |
452 | {Opt_oldalloc, "oldalloc"}, | |
453 | {Opt_orlov, "orlov"}, | |
454 | {Opt_nobh, "nobh"}, | |
455 | {Opt_user_xattr, "user_xattr"}, | |
456 | {Opt_nouser_xattr, "nouser_xattr"}, | |
457 | {Opt_acl, "acl"}, | |
458 | {Opt_noacl, "noacl"}, | |
6d79125b | 459 | {Opt_xip, "xip"}, |
9c3ce9ec | 460 | {Opt_dax, "dax"}, |
8fc2751b | 461 | {Opt_grpquota, "grpquota"}, |
1da177e4 | 462 | {Opt_ignore, "noquota"}, |
8fc2751b MB |
463 | {Opt_quota, "quota"}, |
464 | {Opt_usrquota, "usrquota"}, | |
a686cd89 MB |
465 | {Opt_reservation, "reservation"}, |
466 | {Opt_noreservation, "noreservation"}, | |
1da177e4 LT |
467 | {Opt_err, NULL} |
468 | }; | |
469 | ||
08851957 JK |
470 | static int parse_options(char *options, struct super_block *sb, |
471 | struct ext2_mount_options *opts) | |
1da177e4 | 472 | { |
2314b07c | 473 | char *p; |
1da177e4 | 474 | substring_t args[MAX_OPT_ARGS]; |
1da177e4 | 475 | int option; |
b8a9f9e1 EB |
476 | kuid_t uid; |
477 | kgid_t gid; | |
1da177e4 LT |
478 | |
479 | if (!options) | |
480 | return 1; | |
481 | ||
482 | while ((p = strsep (&options, ",")) != NULL) { | |
483 | int token; | |
484 | if (!*p) | |
485 | continue; | |
486 | ||
487 | token = match_token(p, tokens, args); | |
488 | switch (token) { | |
489 | case Opt_bsd_df: | |
08851957 | 490 | clear_opt (opts->s_mount_opt, MINIX_DF); |
1da177e4 LT |
491 | break; |
492 | case Opt_minix_df: | |
08851957 | 493 | set_opt (opts->s_mount_opt, MINIX_DF); |
1da177e4 LT |
494 | break; |
495 | case Opt_grpid: | |
08851957 | 496 | set_opt (opts->s_mount_opt, GRPID); |
1da177e4 LT |
497 | break; |
498 | case Opt_nogrpid: | |
08851957 | 499 | clear_opt (opts->s_mount_opt, GRPID); |
1da177e4 LT |
500 | break; |
501 | case Opt_resuid: | |
502 | if (match_int(&args[0], &option)) | |
503 | return 0; | |
b8a9f9e1 EB |
504 | uid = make_kuid(current_user_ns(), option); |
505 | if (!uid_valid(uid)) { | |
506 | ext2_msg(sb, KERN_ERR, "Invalid uid value %d", option); | |
ae2cf428 | 507 | return 0; |
b8a9f9e1 EB |
508 | |
509 | } | |
08851957 | 510 | opts->s_resuid = uid; |
1da177e4 LT |
511 | break; |
512 | case Opt_resgid: | |
513 | if (match_int(&args[0], &option)) | |
514 | return 0; | |
b8a9f9e1 EB |
515 | gid = make_kgid(current_user_ns(), option); |
516 | if (!gid_valid(gid)) { | |
517 | ext2_msg(sb, KERN_ERR, "Invalid gid value %d", option); | |
ae2cf428 | 518 | return 0; |
b8a9f9e1 | 519 | } |
08851957 | 520 | opts->s_resgid = gid; |
1da177e4 LT |
521 | break; |
522 | case Opt_sb: | |
523 | /* handled by get_sb_block() instead of here */ | |
524 | /* *sb_block = match_int(&args[0]); */ | |
525 | break; | |
526 | case Opt_err_panic: | |
08851957 JK |
527 | clear_opt (opts->s_mount_opt, ERRORS_CONT); |
528 | clear_opt (opts->s_mount_opt, ERRORS_RO); | |
529 | set_opt (opts->s_mount_opt, ERRORS_PANIC); | |
1da177e4 LT |
530 | break; |
531 | case Opt_err_ro: | |
08851957 JK |
532 | clear_opt (opts->s_mount_opt, ERRORS_CONT); |
533 | clear_opt (opts->s_mount_opt, ERRORS_PANIC); | |
534 | set_opt (opts->s_mount_opt, ERRORS_RO); | |
1da177e4 LT |
535 | break; |
536 | case Opt_err_cont: | |
08851957 JK |
537 | clear_opt (opts->s_mount_opt, ERRORS_RO); |
538 | clear_opt (opts->s_mount_opt, ERRORS_PANIC); | |
539 | set_opt (opts->s_mount_opt, ERRORS_CONT); | |
1da177e4 LT |
540 | break; |
541 | case Opt_nouid32: | |
08851957 | 542 | set_opt (opts->s_mount_opt, NO_UID32); |
1da177e4 | 543 | break; |
1da177e4 | 544 | case Opt_debug: |
08851957 | 545 | set_opt (opts->s_mount_opt, DEBUG); |
1da177e4 LT |
546 | break; |
547 | case Opt_oldalloc: | |
08851957 | 548 | set_opt (opts->s_mount_opt, OLDALLOC); |
1da177e4 LT |
549 | break; |
550 | case Opt_orlov: | |
08851957 | 551 | clear_opt (opts->s_mount_opt, OLDALLOC); |
1da177e4 LT |
552 | break; |
553 | case Opt_nobh: | |
08851957 | 554 | set_opt (opts->s_mount_opt, NOBH); |
1da177e4 LT |
555 | break; |
556 | #ifdef CONFIG_EXT2_FS_XATTR | |
557 | case Opt_user_xattr: | |
08851957 | 558 | set_opt (opts->s_mount_opt, XATTR_USER); |
1da177e4 LT |
559 | break; |
560 | case Opt_nouser_xattr: | |
08851957 | 561 | clear_opt (opts->s_mount_opt, XATTR_USER); |
1da177e4 LT |
562 | break; |
563 | #else | |
564 | case Opt_user_xattr: | |
565 | case Opt_nouser_xattr: | |
2314b07c OR |
566 | ext2_msg(sb, KERN_INFO, "(no)user_xattr options" |
567 | "not supported"); | |
1da177e4 LT |
568 | break; |
569 | #endif | |
570 | #ifdef CONFIG_EXT2_FS_POSIX_ACL | |
571 | case Opt_acl: | |
08851957 | 572 | set_opt(opts->s_mount_opt, POSIX_ACL); |
1da177e4 LT |
573 | break; |
574 | case Opt_noacl: | |
08851957 | 575 | clear_opt(opts->s_mount_opt, POSIX_ACL); |
1da177e4 LT |
576 | break; |
577 | #else | |
578 | case Opt_acl: | |
579 | case Opt_noacl: | |
2314b07c OR |
580 | ext2_msg(sb, KERN_INFO, |
581 | "(no)acl options not supported"); | |
1da177e4 LT |
582 | break; |
583 | #endif | |
6d79125b | 584 | case Opt_xip: |
9c3ce9ec | 585 | ext2_msg(sb, KERN_INFO, "use dax instead of xip"); |
08851957 | 586 | set_opt(opts->s_mount_opt, XIP); |
df561f66 | 587 | fallthrough; |
9c3ce9ec | 588 | case Opt_dax: |
6cd176a5 | 589 | #ifdef CONFIG_FS_DAX |
ef83b6e8 DW |
590 | ext2_msg(sb, KERN_WARNING, |
591 | "DAX enabled. Warning: EXPERIMENTAL, use at your own risk"); | |
08851957 | 592 | set_opt(opts->s_mount_opt, DAX); |
6d79125b | 593 | #else |
9c3ce9ec | 594 | ext2_msg(sb, KERN_INFO, "dax option not supported"); |
6d79125b CO |
595 | #endif |
596 | break; | |
8fc2751b MB |
597 | |
598 | #if defined(CONFIG_QUOTA) | |
599 | case Opt_quota: | |
600 | case Opt_usrquota: | |
08851957 | 601 | set_opt(opts->s_mount_opt, USRQUOTA); |
8fc2751b MB |
602 | break; |
603 | ||
604 | case Opt_grpquota: | |
08851957 | 605 | set_opt(opts->s_mount_opt, GRPQUOTA); |
8fc2751b MB |
606 | break; |
607 | #else | |
608 | case Opt_quota: | |
609 | case Opt_usrquota: | |
610 | case Opt_grpquota: | |
2314b07c OR |
611 | ext2_msg(sb, KERN_INFO, |
612 | "quota operations not supported"); | |
8fc2751b MB |
613 | break; |
614 | #endif | |
615 | ||
a686cd89 | 616 | case Opt_reservation: |
08851957 | 617 | set_opt(opts->s_mount_opt, RESERVATION); |
2314b07c | 618 | ext2_msg(sb, KERN_INFO, "reservations ON"); |
a686cd89 MB |
619 | break; |
620 | case Opt_noreservation: | |
08851957 | 621 | clear_opt(opts->s_mount_opt, RESERVATION); |
2314b07c | 622 | ext2_msg(sb, KERN_INFO, "reservations OFF"); |
a686cd89 | 623 | break; |
1da177e4 LT |
624 | case Opt_ignore: |
625 | break; | |
626 | default: | |
627 | return 0; | |
628 | } | |
629 | } | |
1da177e4 LT |
630 | return 1; |
631 | } | |
632 | ||
633 | static int ext2_setup_super (struct super_block * sb, | |
634 | struct ext2_super_block * es, | |
635 | int read_only) | |
636 | { | |
637 | int res = 0; | |
638 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
639 | ||
640 | if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) { | |
2314b07c OR |
641 | ext2_msg(sb, KERN_ERR, |
642 | "error: revision level too high, " | |
643 | "forcing read-only mode"); | |
1751e8a6 | 644 | res = SB_RDONLY; |
1da177e4 LT |
645 | } |
646 | if (read_only) | |
647 | return res; | |
648 | if (!(sbi->s_mount_state & EXT2_VALID_FS)) | |
2314b07c OR |
649 | ext2_msg(sb, KERN_WARNING, |
650 | "warning: mounting unchecked fs, " | |
651 | "running e2fsck is recommended"); | |
1da177e4 | 652 | else if ((sbi->s_mount_state & EXT2_ERROR_FS)) |
2314b07c OR |
653 | ext2_msg(sb, KERN_WARNING, |
654 | "warning: mounting fs with errors, " | |
655 | "running e2fsck is recommended"); | |
1da177e4 LT |
656 | else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && |
657 | le16_to_cpu(es->s_mnt_count) >= | |
658 | (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) | |
2314b07c OR |
659 | ext2_msg(sb, KERN_WARNING, |
660 | "warning: maximal mount count reached, " | |
661 | "running e2fsck is recommended"); | |
1da177e4 | 662 | else if (le32_to_cpu(es->s_checkinterval) && |
2314b07c | 663 | (le32_to_cpu(es->s_lastcheck) + |
fe2c3254 AB |
664 | le32_to_cpu(es->s_checkinterval) <= |
665 | ktime_get_real_seconds())) | |
2314b07c OR |
666 | ext2_msg(sb, KERN_WARNING, |
667 | "warning: checktime reached, " | |
668 | "running e2fsck is recommended"); | |
1da177e4 LT |
669 | if (!le16_to_cpu(es->s_max_mnt_count)) |
670 | es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT); | |
fba4d399 | 671 | le16_add_cpu(&es->s_mnt_count, 1); |
1da177e4 | 672 | if (test_opt (sb, DEBUG)) |
2314b07c OR |
673 | ext2_msg(sb, KERN_INFO, "%s, %s, bs=%lu, fs=%lu, gc=%lu, " |
674 | "bpg=%lu, ipg=%lu, mo=%04lx]", | |
1da177e4 LT |
675 | EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize, |
676 | sbi->s_frag_size, | |
677 | sbi->s_groups_count, | |
678 | EXT2_BLOCKS_PER_GROUP(sb), | |
679 | EXT2_INODES_PER_GROUP(sb), | |
680 | sbi->s_mount_opt); | |
1da177e4 LT |
681 | return res; |
682 | } | |
683 | ||
197cd65a | 684 | static int ext2_check_descriptors(struct super_block *sb) |
1da177e4 LT |
685 | { |
686 | int i; | |
1da177e4 | 687 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
1da177e4 LT |
688 | |
689 | ext2_debug ("Checking group descriptors"); | |
690 | ||
197cd65a AM |
691 | for (i = 0; i < sbi->s_groups_count; i++) { |
692 | struct ext2_group_desc *gdp = ext2_get_group_desc(sb, i, NULL); | |
24097d12 | 693 | ext2_fsblk_t first_block = ext2_group_first_block_no(sb, i); |
90f3741c | 694 | ext2_fsblk_t last_block = ext2_group_last_block_no(sb, i); |
41f04d85 | 695 | |
41f04d85 ES |
696 | if (le32_to_cpu(gdp->bg_block_bitmap) < first_block || |
697 | le32_to_cpu(gdp->bg_block_bitmap) > last_block) | |
1da177e4 LT |
698 | { |
699 | ext2_error (sb, "ext2_check_descriptors", | |
700 | "Block bitmap for group %d" | |
701 | " not in group (block %lu)!", | |
702 | i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap)); | |
703 | return 0; | |
704 | } | |
41f04d85 ES |
705 | if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block || |
706 | le32_to_cpu(gdp->bg_inode_bitmap) > last_block) | |
1da177e4 LT |
707 | { |
708 | ext2_error (sb, "ext2_check_descriptors", | |
709 | "Inode bitmap for group %d" | |
710 | " not in group (block %lu)!", | |
711 | i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap)); | |
712 | return 0; | |
713 | } | |
41f04d85 | 714 | if (le32_to_cpu(gdp->bg_inode_table) < first_block || |
780dcdb2 | 715 | le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 > |
41f04d85 | 716 | last_block) |
1da177e4 LT |
717 | { |
718 | ext2_error (sb, "ext2_check_descriptors", | |
719 | "Inode table for group %d" | |
720 | " not in group (block %lu)!", | |
721 | i, (unsigned long) le32_to_cpu(gdp->bg_inode_table)); | |
722 | return 0; | |
723 | } | |
1da177e4 LT |
724 | } |
725 | return 1; | |
726 | } | |
727 | ||
1da177e4 LT |
728 | /* |
729 | * Maximal file size. There is a direct, and {,double-,triple-}indirect | |
730 | * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. | |
731 | * We need to be 1 filesystem block less than the 2^32 sector limit. | |
732 | */ | |
733 | static loff_t ext2_max_size(int bits) | |
734 | { | |
735 | loff_t res = EXT2_NDIR_BLOCKS; | |
902be4c5 | 736 | int meta_blocks; |
1c2d1421 JK |
737 | unsigned int upper_limit; |
738 | unsigned int ppb = 1 << (bits-2); | |
902be4c5 AK |
739 | |
740 | /* This is calculated to be the largest file size for a | |
741 | * dense, file such that the total number of | |
1da177e4 | 742 | * sectors in the file, including data and all indirect blocks, |
902be4c5 AK |
743 | * does not exceed 2^32 -1 |
744 | * __u32 i_blocks representing the total number of | |
745 | * 512 bytes blocks of the file | |
746 | */ | |
747 | upper_limit = (1LL << 32) - 1; | |
748 | ||
749 | /* total blocks in file system block size */ | |
750 | upper_limit >>= (bits - 9); | |
751 | ||
1c2d1421 JK |
752 | /* Compute how many blocks we can address by block tree */ |
753 | res += 1LL << (bits-2); | |
754 | res += 1LL << (2*(bits-2)); | |
755 | res += 1LL << (3*(bits-2)); | |
9ad185ee ZY |
756 | /* Compute how many metadata blocks are needed */ |
757 | meta_blocks = 1; | |
758 | meta_blocks += 1 + ppb; | |
759 | meta_blocks += 1 + ppb + ppb * ppb; | |
1c2d1421 | 760 | /* Does block tree limit file size? */ |
9ad185ee | 761 | if (res + meta_blocks <= upper_limit) |
1c2d1421 | 762 | goto check_lfs; |
902be4c5 | 763 | |
1c2d1421 JK |
764 | res = upper_limit; |
765 | /* How many metadata blocks are needed for addressing upper_limit? */ | |
766 | upper_limit -= EXT2_NDIR_BLOCKS; | |
902be4c5 AK |
767 | /* indirect blocks */ |
768 | meta_blocks = 1; | |
1c2d1421 | 769 | upper_limit -= ppb; |
902be4c5 | 770 | /* double indirect blocks */ |
1c2d1421 JK |
771 | if (upper_limit < ppb * ppb) { |
772 | meta_blocks += 1 + DIV_ROUND_UP(upper_limit, ppb); | |
773 | res -= meta_blocks; | |
774 | goto check_lfs; | |
775 | } | |
776 | meta_blocks += 1 + ppb; | |
777 | upper_limit -= ppb * ppb; | |
778 | /* tripple indirect blocks for the rest */ | |
779 | meta_blocks += 1 + DIV_ROUND_UP(upper_limit, ppb) + | |
780 | DIV_ROUND_UP(upper_limit, ppb*ppb); | |
781 | res -= meta_blocks; | |
782 | check_lfs: | |
1da177e4 | 783 | res <<= bits; |
902be4c5 AK |
784 | if (res > MAX_LFS_FILESIZE) |
785 | res = MAX_LFS_FILESIZE; | |
786 | ||
1da177e4 LT |
787 | return res; |
788 | } | |
789 | ||
790 | static unsigned long descriptor_loc(struct super_block *sb, | |
791 | unsigned long logic_sb_block, | |
792 | int nr) | |
793 | { | |
794 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
24097d12 | 795 | unsigned long bg, first_meta_bg; |
1da177e4 | 796 | |
1da177e4 LT |
797 | first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); |
798 | ||
799 | if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) || | |
800 | nr < first_meta_bg) | |
801 | return (logic_sb_block + nr + 1); | |
802 | bg = sbi->s_desc_per_block * nr; | |
24097d12 | 803 | |
545886fe | 804 | return ext2_group_first_block_no(sb, bg) + ext2_bg_has_super(sb, bg); |
1da177e4 LT |
805 | } |
806 | ||
807 | static int ext2_fill_super(struct super_block *sb, void *data, int silent) | |
808 | { | |
8cf037a8 | 809 | struct dax_device *dax_dev = fs_dax_get_by_bdev(sb->s_bdev); |
1da177e4 LT |
810 | struct buffer_head * bh; |
811 | struct ext2_sb_info * sbi; | |
812 | struct ext2_super_block * es; | |
813 | struct inode *root; | |
814 | unsigned long block; | |
815 | unsigned long sb_block = get_sb_block(&data); | |
816 | unsigned long logic_sb_block; | |
817 | unsigned long offset = 0; | |
818 | unsigned long def_mount_opts; | |
d0909905 | 819 | long ret = -ENOMEM; |
1da177e4 LT |
820 | int blocksize = BLOCK_SIZE; |
821 | int db_count; | |
822 | int i, j; | |
823 | __le32 features; | |
833f4077 | 824 | int err; |
08851957 | 825 | struct ext2_mount_options opts; |
1da177e4 | 826 | |
f8314dc6 | 827 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); |
1da177e4 | 828 | if (!sbi) |
e124a320 | 829 | goto failed; |
18a82eb9 PE |
830 | |
831 | sbi->s_blockgroup_lock = | |
832 | kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); | |
833 | if (!sbi->s_blockgroup_lock) { | |
834 | kfree(sbi); | |
e124a320 | 835 | goto failed; |
18a82eb9 | 836 | } |
1da177e4 | 837 | sb->s_fs_info = sbi; |
93d44cb2 | 838 | sbi->s_sb_block = sb_block; |
8cf037a8 | 839 | sbi->s_daxdev = dax_dev; |
1da177e4 | 840 | |
c15271f4 | 841 | spin_lock_init(&sbi->s_lock); |
d0909905 | 842 | ret = -EINVAL; |
c15271f4 | 843 | |
1da177e4 LT |
844 | /* |
845 | * See what the current blocksize for the device is, and | |
846 | * use that as the blocksize. Otherwise (or if the blocksize | |
847 | * is smaller than the default) use the default. | |
848 | * This is important for devices that have a hardware | |
849 | * sectorsize that is larger than the default. | |
850 | */ | |
851 | blocksize = sb_min_blocksize(sb, BLOCK_SIZE); | |
852 | if (!blocksize) { | |
2314b07c | 853 | ext2_msg(sb, KERN_ERR, "error: unable to set blocksize"); |
1da177e4 LT |
854 | goto failed_sbi; |
855 | } | |
856 | ||
857 | /* | |
858 | * If the superblock doesn't start on a hardware sector boundary, | |
859 | * calculate the offset. | |
860 | */ | |
861 | if (blocksize != BLOCK_SIZE) { | |
862 | logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; | |
863 | offset = (sb_block*BLOCK_SIZE) % blocksize; | |
864 | } else { | |
865 | logic_sb_block = sb_block; | |
866 | } | |
867 | ||
868 | if (!(bh = sb_bread(sb, logic_sb_block))) { | |
2314b07c | 869 | ext2_msg(sb, KERN_ERR, "error: unable to read superblock"); |
1da177e4 LT |
870 | goto failed_sbi; |
871 | } | |
872 | /* | |
873 | * Note: s_es must be initialized as soon as possible because | |
874 | * some ext2 macro-instructions depend on its value | |
875 | */ | |
876 | es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); | |
877 | sbi->s_es = es; | |
878 | sb->s_magic = le16_to_cpu(es->s_magic); | |
879 | ||
880 | if (sb->s_magic != EXT2_SUPER_MAGIC) | |
881 | goto cantfind_ext2; | |
882 | ||
e5f5b717 | 883 | opts.s_mount_opt = 0; |
1da177e4 LT |
884 | /* Set defaults before we parse the mount options */ |
885 | def_mount_opts = le32_to_cpu(es->s_default_mount_opts); | |
886 | if (def_mount_opts & EXT2_DEFM_DEBUG) | |
08851957 | 887 | set_opt(opts.s_mount_opt, DEBUG); |
1da177e4 | 888 | if (def_mount_opts & EXT2_DEFM_BSDGROUPS) |
08851957 | 889 | set_opt(opts.s_mount_opt, GRPID); |
1da177e4 | 890 | if (def_mount_opts & EXT2_DEFM_UID16) |
08851957 | 891 | set_opt(opts.s_mount_opt, NO_UID32); |
2e7842b8 | 892 | #ifdef CONFIG_EXT2_FS_XATTR |
1da177e4 | 893 | if (def_mount_opts & EXT2_DEFM_XATTR_USER) |
08851957 | 894 | set_opt(opts.s_mount_opt, XATTR_USER); |
2e7842b8 HD |
895 | #endif |
896 | #ifdef CONFIG_EXT2_FS_POSIX_ACL | |
1da177e4 | 897 | if (def_mount_opts & EXT2_DEFM_ACL) |
08851957 | 898 | set_opt(opts.s_mount_opt, POSIX_ACL); |
2e7842b8 | 899 | #endif |
1da177e4 LT |
900 | |
901 | if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC) | |
08851957 | 902 | set_opt(opts.s_mount_opt, ERRORS_PANIC); |
14e11e10 | 903 | else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE) |
08851957 | 904 | set_opt(opts.s_mount_opt, ERRORS_CONT); |
14e11e10 | 905 | else |
08851957 | 906 | set_opt(opts.s_mount_opt, ERRORS_RO); |
1da177e4 | 907 | |
08851957 JK |
908 | opts.s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid)); |
909 | opts.s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid)); | |
1da177e4 | 910 | |
08851957 | 911 | set_opt(opts.s_mount_opt, RESERVATION); |
a686cd89 | 912 | |
08851957 | 913 | if (!parse_options((char *) data, sb, &opts)) |
1da177e4 LT |
914 | goto failed_mount; |
915 | ||
08851957 JK |
916 | sbi->s_mount_opt = opts.s_mount_opt; |
917 | sbi->s_resuid = opts.s_resuid; | |
918 | sbi->s_resgid = opts.s_resgid; | |
919 | ||
1751e8a6 | 920 | sb->s_flags = (sb->s_flags & ~SB_POSIXACL) | |
38fa0e8e | 921 | (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0); |
46b15caa | 922 | sb->s_iflags |= SB_I_CGROUPWB; |
1da177e4 LT |
923 | |
924 | if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV && | |
925 | (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) || | |
926 | EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) || | |
927 | EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U))) | |
2314b07c OR |
928 | ext2_msg(sb, KERN_WARNING, |
929 | "warning: feature flags set on rev 0 fs, " | |
930 | "running e2fsck is recommended"); | |
1da177e4 LT |
931 | /* |
932 | * Check feature flags regardless of the revision level, since we | |
933 | * previously didn't change the revision level when setting the flags, | |
934 | * so there is a chance incompat flags are set on a rev 0 filesystem. | |
935 | */ | |
936 | features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP); | |
937 | if (features) { | |
2314b07c OR |
938 | ext2_msg(sb, KERN_ERR, "error: couldn't mount because of " |
939 | "unsupported optional features (%x)", | |
940 | le32_to_cpu(features)); | |
1da177e4 LT |
941 | goto failed_mount; |
942 | } | |
bc98a42c | 943 | if (!sb_rdonly(sb) && (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){ |
2314b07c OR |
944 | ext2_msg(sb, KERN_ERR, "error: couldn't mount RDWR because of " |
945 | "unsupported optional features (%x)", | |
946 | le32_to_cpu(features)); | |
1da177e4 LT |
947 | goto failed_mount; |
948 | } | |
949 | ||
950 | blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size); | |
951 | ||
38fa0e8e | 952 | if (test_opt(sb, DAX)) { |
bdd3c50d CH |
953 | if (!dax_supported(dax_dev, sb->s_bdev, blocksize, 0, |
954 | bdev_nr_sectors(sb->s_bdev))) { | |
b4b5798c DW |
955 | ext2_msg(sb, KERN_ERR, |
956 | "DAX unsupported by block device. Turning off DAX."); | |
38fa0e8e | 957 | clear_opt(sbi->s_mount_opt, DAX); |
b4b5798c | 958 | } |
6d79125b CO |
959 | } |
960 | ||
1da177e4 LT |
961 | /* If the blocksize doesn't match, re-read the thing.. */ |
962 | if (sb->s_blocksize != blocksize) { | |
963 | brelse(bh); | |
964 | ||
965 | if (!sb_set_blocksize(sb, blocksize)) { | |
4e299c1d RD |
966 | ext2_msg(sb, KERN_ERR, |
967 | "error: bad blocksize %d", blocksize); | |
1da177e4 LT |
968 | goto failed_sbi; |
969 | } | |
970 | ||
971 | logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; | |
972 | offset = (sb_block*BLOCK_SIZE) % blocksize; | |
973 | bh = sb_bread(sb, logic_sb_block); | |
974 | if(!bh) { | |
2314b07c OR |
975 | ext2_msg(sb, KERN_ERR, "error: couldn't read" |
976 | "superblock on 2nd try"); | |
1da177e4 LT |
977 | goto failed_sbi; |
978 | } | |
979 | es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); | |
980 | sbi->s_es = es; | |
981 | if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) { | |
2314b07c | 982 | ext2_msg(sb, KERN_ERR, "error: magic mismatch"); |
1da177e4 LT |
983 | goto failed_mount; |
984 | } | |
985 | } | |
986 | ||
987 | sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits); | |
8de52778 | 988 | sb->s_max_links = EXT2_LINK_MAX; |
22b13969 DD |
989 | sb->s_time_min = S32_MIN; |
990 | sb->s_time_max = S32_MAX; | |
1da177e4 LT |
991 | |
992 | if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) { | |
993 | sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE; | |
994 | sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO; | |
995 | } else { | |
996 | sbi->s_inode_size = le16_to_cpu(es->s_inode_size); | |
997 | sbi->s_first_ino = le32_to_cpu(es->s_first_ino); | |
998 | if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) || | |
d8ea6cf8 | 999 | !is_power_of_2(sbi->s_inode_size) || |
1da177e4 | 1000 | (sbi->s_inode_size > blocksize)) { |
2314b07c OR |
1001 | ext2_msg(sb, KERN_ERR, |
1002 | "error: unsupported inode size: %d", | |
1da177e4 LT |
1003 | sbi->s_inode_size); |
1004 | goto failed_mount; | |
1005 | } | |
1006 | } | |
1007 | ||
1008 | sbi->s_frag_size = EXT2_MIN_FRAG_SIZE << | |
1009 | le32_to_cpu(es->s_log_frag_size); | |
1010 | if (sbi->s_frag_size == 0) | |
1011 | goto cantfind_ext2; | |
1012 | sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size; | |
1013 | ||
1014 | sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); | |
1015 | sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); | |
1016 | sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); | |
1017 | ||
1da177e4 | 1018 | sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb); |
607eb266 | 1019 | if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0) |
1da177e4 LT |
1020 | goto cantfind_ext2; |
1021 | sbi->s_itb_per_group = sbi->s_inodes_per_group / | |
1022 | sbi->s_inodes_per_block; | |
1023 | sbi->s_desc_per_block = sb->s_blocksize / | |
1024 | sizeof (struct ext2_group_desc); | |
1025 | sbi->s_sbh = bh; | |
1026 | sbi->s_mount_state = le16_to_cpu(es->s_state); | |
1027 | sbi->s_addr_per_block_bits = | |
f0d1b0b3 | 1028 | ilog2 (EXT2_ADDR_PER_BLOCK(sb)); |
1da177e4 | 1029 | sbi->s_desc_per_block_bits = |
f0d1b0b3 | 1030 | ilog2 (EXT2_DESC_PER_BLOCK(sb)); |
1da177e4 LT |
1031 | |
1032 | if (sb->s_magic != EXT2_SUPER_MAGIC) | |
1033 | goto cantfind_ext2; | |
1034 | ||
1035 | if (sb->s_blocksize != bh->b_size) { | |
1036 | if (!silent) | |
2314b07c | 1037 | ext2_msg(sb, KERN_ERR, "error: unsupported blocksize"); |
1da177e4 LT |
1038 | goto failed_mount; |
1039 | } | |
1040 | ||
1041 | if (sb->s_blocksize != sbi->s_frag_size) { | |
2314b07c OR |
1042 | ext2_msg(sb, KERN_ERR, |
1043 | "error: fragsize %lu != blocksize %lu" | |
1044 | "(not supported yet)", | |
1da177e4 LT |
1045 | sbi->s_frag_size, sb->s_blocksize); |
1046 | goto failed_mount; | |
1047 | } | |
1048 | ||
1049 | if (sbi->s_blocks_per_group > sb->s_blocksize * 8) { | |
2314b07c OR |
1050 | ext2_msg(sb, KERN_ERR, |
1051 | "error: #blocks per group too big: %lu", | |
1da177e4 LT |
1052 | sbi->s_blocks_per_group); |
1053 | goto failed_mount; | |
1054 | } | |
1055 | if (sbi->s_frags_per_group > sb->s_blocksize * 8) { | |
2314b07c OR |
1056 | ext2_msg(sb, KERN_ERR, |
1057 | "error: #fragments per group too big: %lu", | |
1da177e4 LT |
1058 | sbi->s_frags_per_group); |
1059 | goto failed_mount; | |
1060 | } | |
1061 | if (sbi->s_inodes_per_group > sb->s_blocksize * 8) { | |
2314b07c OR |
1062 | ext2_msg(sb, KERN_ERR, |
1063 | "error: #inodes per group too big: %lu", | |
1da177e4 LT |
1064 | sbi->s_inodes_per_group); |
1065 | goto failed_mount; | |
1066 | } | |
1067 | ||
1068 | if (EXT2_BLOCKS_PER_GROUP(sb) == 0) | |
1069 | goto cantfind_ext2; | |
d9e98668 NC |
1070 | sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) - |
1071 | le32_to_cpu(es->s_first_data_block) - 1) | |
1072 | / EXT2_BLOCKS_PER_GROUP(sb)) + 1; | |
1da177e4 LT |
1073 | db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) / |
1074 | EXT2_DESC_PER_BLOCK(sb); | |
a219ee41 | 1075 | sbi->s_group_desc = kmalloc_array(db_count, |
6da2ec56 KC |
1076 | sizeof(struct buffer_head *), |
1077 | GFP_KERNEL); | |
1da177e4 | 1078 | if (sbi->s_group_desc == NULL) { |
6a03e6a8 | 1079 | ret = -ENOMEM; |
2314b07c | 1080 | ext2_msg(sb, KERN_ERR, "error: not enough memory"); |
1da177e4 LT |
1081 | goto failed_mount; |
1082 | } | |
18a82eb9 | 1083 | bgl_lock_init(sbi->s_blockgroup_lock); |
dd00cc48 | 1084 | sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL); |
1da177e4 | 1085 | if (!sbi->s_debts) { |
6a03e6a8 | 1086 | ret = -ENOMEM; |
2314b07c | 1087 | ext2_msg(sb, KERN_ERR, "error: not enough memory"); |
1da177e4 LT |
1088 | goto failed_mount_group_desc; |
1089 | } | |
1da177e4 LT |
1090 | for (i = 0; i < db_count; i++) { |
1091 | block = descriptor_loc(sb, logic_sb_block, i); | |
1092 | sbi->s_group_desc[i] = sb_bread(sb, block); | |
1093 | if (!sbi->s_group_desc[i]) { | |
1094 | for (j = 0; j < i; j++) | |
1095 | brelse (sbi->s_group_desc[j]); | |
2314b07c OR |
1096 | ext2_msg(sb, KERN_ERR, |
1097 | "error: unable to read group descriptors"); | |
1da177e4 LT |
1098 | goto failed_mount_group_desc; |
1099 | } | |
1100 | } | |
1101 | if (!ext2_check_descriptors (sb)) { | |
2314b07c | 1102 | ext2_msg(sb, KERN_ERR, "group descriptors corrupted"); |
1da177e4 LT |
1103 | goto failed_mount2; |
1104 | } | |
1105 | sbi->s_gdb_count = db_count; | |
1106 | get_random_bytes(&sbi->s_next_generation, sizeof(u32)); | |
1107 | spin_lock_init(&sbi->s_next_gen_lock); | |
0216bfcf | 1108 | |
e312c97e | 1109 | /* per filesystem reservation list head & lock */ |
a686cd89 MB |
1110 | spin_lock_init(&sbi->s_rsv_window_lock); |
1111 | sbi->s_rsv_window_root = RB_ROOT; | |
1112 | /* | |
1113 | * Add a single, static dummy reservation to the start of the | |
1114 | * reservation window list --- it gives us a placeholder for | |
1115 | * append-at-start-of-list which makes the allocation logic | |
1116 | * _much_ simpler. | |
1117 | */ | |
1118 | sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; | |
1119 | sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; | |
1120 | sbi->s_rsv_window_head.rsv_alloc_hit = 0; | |
1121 | sbi->s_rsv_window_head.rsv_goal_size = 0; | |
1122 | ext2_rsv_window_add(sb, &sbi->s_rsv_window_head); | |
1123 | ||
833f4077 | 1124 | err = percpu_counter_init(&sbi->s_freeblocks_counter, |
908c7f19 | 1125 | ext2_count_free_blocks(sb), GFP_KERNEL); |
833f4077 PZ |
1126 | if (!err) { |
1127 | err = percpu_counter_init(&sbi->s_freeinodes_counter, | |
908c7f19 | 1128 | ext2_count_free_inodes(sb), GFP_KERNEL); |
833f4077 PZ |
1129 | } |
1130 | if (!err) { | |
1131 | err = percpu_counter_init(&sbi->s_dirs_counter, | |
908c7f19 | 1132 | ext2_count_dirs(sb), GFP_KERNEL); |
833f4077 PZ |
1133 | } |
1134 | if (err) { | |
34e92542 | 1135 | ret = err; |
2314b07c | 1136 | ext2_msg(sb, KERN_ERR, "error: insufficient memory"); |
833f4077 PZ |
1137 | goto failed_mount3; |
1138 | } | |
be0726d3 JK |
1139 | |
1140 | #ifdef CONFIG_EXT2_FS_XATTR | |
47387409 TE |
1141 | sbi->s_ea_block_cache = ext2_xattr_create_cache(); |
1142 | if (!sbi->s_ea_block_cache) { | |
6a03e6a8 | 1143 | ret = -ENOMEM; |
47387409 | 1144 | ext2_msg(sb, KERN_ERR, "Failed to create ea_block_cache"); |
be0726d3 JK |
1145 | goto failed_mount3; |
1146 | } | |
1147 | #endif | |
1da177e4 LT |
1148 | /* |
1149 | * set up enough so that it can read an inode | |
1150 | */ | |
1151 | sb->s_op = &ext2_sops; | |
1152 | sb->s_export_op = &ext2_export_ops; | |
1153 | sb->s_xattr = ext2_xattr_handlers; | |
123e9caf CH |
1154 | |
1155 | #ifdef CONFIG_QUOTA | |
1156 | sb->dq_op = &dquot_operations; | |
161f3b74 | 1157 | sb->s_qcop = &ext2_quotactl_ops; |
64241118 | 1158 | sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; |
123e9caf CH |
1159 | #endif |
1160 | ||
52fcf703 DH |
1161 | root = ext2_iget(sb, EXT2_ROOT_INO); |
1162 | if (IS_ERR(root)) { | |
1163 | ret = PTR_ERR(root); | |
0216bfcf | 1164 | goto failed_mount3; |
1da177e4 LT |
1165 | } |
1166 | if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { | |
52fcf703 | 1167 | iput(root); |
2314b07c | 1168 | ext2_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck"); |
0216bfcf | 1169 | goto failed_mount3; |
1da177e4 | 1170 | } |
52fcf703 | 1171 | |
48fde701 | 1172 | sb->s_root = d_make_root(root); |
52fcf703 | 1173 | if (!sb->s_root) { |
2314b07c | 1174 | ext2_msg(sb, KERN_ERR, "error: get root inode failed"); |
52fcf703 DH |
1175 | ret = -ENOMEM; |
1176 | goto failed_mount3; | |
1177 | } | |
1da177e4 | 1178 | if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) |
2314b07c OR |
1179 | ext2_msg(sb, KERN_WARNING, |
1180 | "warning: mounting ext3 filesystem as ext2"); | |
bc98a42c | 1181 | if (ext2_setup_super (sb, es, sb_rdonly(sb))) |
1751e8a6 | 1182 | sb->s_flags |= SB_RDONLY; |
4c96a68b | 1183 | ext2_write_super(sb); |
1da177e4 LT |
1184 | return 0; |
1185 | ||
1186 | cantfind_ext2: | |
1187 | if (!silent) | |
2314b07c OR |
1188 | ext2_msg(sb, KERN_ERR, |
1189 | "error: can't find an ext2 filesystem on dev %s.", | |
1190 | sb->s_id); | |
1da177e4 | 1191 | goto failed_mount; |
0216bfcf | 1192 | failed_mount3: |
569ae920 | 1193 | ext2_xattr_destroy_cache(sbi->s_ea_block_cache); |
0216bfcf MC |
1194 | percpu_counter_destroy(&sbi->s_freeblocks_counter); |
1195 | percpu_counter_destroy(&sbi->s_freeinodes_counter); | |
1196 | percpu_counter_destroy(&sbi->s_dirs_counter); | |
1da177e4 LT |
1197 | failed_mount2: |
1198 | for (i = 0; i < db_count; i++) | |
1199 | brelse(sbi->s_group_desc[i]); | |
1200 | failed_mount_group_desc: | |
1201 | kfree(sbi->s_group_desc); | |
1202 | kfree(sbi->s_debts); | |
1203 | failed_mount: | |
1204 | brelse(bh); | |
1205 | failed_sbi: | |
1206 | sb->s_fs_info = NULL; | |
0f7ee7c1 | 1207 | kfree(sbi->s_blockgroup_lock); |
1da177e4 | 1208 | kfree(sbi); |
e124a320 | 1209 | failed: |
8cf037a8 | 1210 | fs_put_dax(dax_dev); |
52fcf703 | 1211 | return ret; |
1da177e4 LT |
1212 | } |
1213 | ||
7bf0dc9b TT |
1214 | static void ext2_clear_super_error(struct super_block *sb) |
1215 | { | |
1216 | struct buffer_head *sbh = EXT2_SB(sb)->s_sbh; | |
1217 | ||
1218 | if (buffer_write_io_error(sbh)) { | |
1219 | /* | |
1220 | * Oh, dear. A previous attempt to write the | |
1221 | * superblock failed. This could happen because the | |
1222 | * USB device was yanked out. Or it could happen to | |
1223 | * be a transient write error and maybe the block will | |
1224 | * be remapped. Nothing we can do but to retry the | |
1225 | * write and hope for the best. | |
1226 | */ | |
2b8120ef | 1227 | ext2_msg(sb, KERN_ERR, |
f463589a | 1228 | "previous I/O error to superblock detected"); |
7bf0dc9b TT |
1229 | clear_buffer_write_io_error(sbh); |
1230 | set_buffer_uptodate(sbh); | |
1231 | } | |
1232 | } | |
1233 | ||
65547661 JK |
1234 | void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es, |
1235 | int wait) | |
1da177e4 | 1236 | { |
7bf0dc9b | 1237 | ext2_clear_super_error(sb); |
c15271f4 | 1238 | spin_lock(&EXT2_SB(sb)->s_lock); |
1da177e4 LT |
1239 | es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb)); |
1240 | es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb)); | |
fe2c3254 | 1241 | es->s_wtime = cpu_to_le32(ktime_get_real_seconds()); |
c15271f4 JB |
1242 | /* unlock before we do IO */ |
1243 | spin_unlock(&EXT2_SB(sb)->s_lock); | |
1da177e4 | 1244 | mark_buffer_dirty(EXT2_SB(sb)->s_sbh); |
ee6921eb JB |
1245 | if (wait) |
1246 | sync_dirty_buffer(EXT2_SB(sb)->s_sbh); | |
1da177e4 LT |
1247 | } |
1248 | ||
1249 | /* | |
1250 | * In the second extended file system, it is not necessary to | |
1251 | * write the super block since we use a mapping of the | |
1252 | * disk super block in a buffer. | |
1253 | * | |
1254 | * However, this function is still used to set the fs valid | |
1255 | * flags to 0. We need to set this flag to 0 since the fs | |
1256 | * may have been checked while mounted and e2fsck may have | |
1257 | * set s_state to EXT2_VALID_FS after some corrections. | |
1258 | */ | |
40f31dd4 | 1259 | static int ext2_sync_fs(struct super_block *sb, int wait) |
1da177e4 | 1260 | { |
c15271f4 | 1261 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
40f31dd4 CH |
1262 | struct ext2_super_block *es = EXT2_SB(sb)->s_es; |
1263 | ||
a1177825 JK |
1264 | /* |
1265 | * Write quota structures to quota file, sync_blockdev() will write | |
1266 | * them to disk later | |
1267 | */ | |
1268 | dquot_writeback_dquots(sb, -1); | |
1269 | ||
c15271f4 | 1270 | spin_lock(&sbi->s_lock); |
40f31dd4 CH |
1271 | if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) { |
1272 | ext2_debug("setting valid to 0\n"); | |
1273 | es->s_state &= cpu_to_le16(~EXT2_VALID_FS); | |
1da177e4 | 1274 | } |
c15271f4 | 1275 | spin_unlock(&sbi->s_lock); |
ee6921eb | 1276 | ext2_sync_super(sb, es, wait); |
40f31dd4 CH |
1277 | return 0; |
1278 | } | |
1279 | ||
1e8b212f JK |
1280 | static int ext2_freeze(struct super_block *sb) |
1281 | { | |
1282 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
1283 | ||
1284 | /* | |
1285 | * Open but unlinked files present? Keep EXT2_VALID_FS flag cleared | |
1286 | * because we have unattached inodes and thus filesystem is not fully | |
1287 | * consistent. | |
1288 | */ | |
1289 | if (atomic_long_read(&sb->s_remove_count)) { | |
1290 | ext2_sync_fs(sb, 1); | |
1291 | return 0; | |
1292 | } | |
1293 | /* Set EXT2_FS_VALID flag */ | |
1294 | spin_lock(&sbi->s_lock); | |
1295 | sbi->s_es->s_state = cpu_to_le16(sbi->s_mount_state); | |
1296 | spin_unlock(&sbi->s_lock); | |
1297 | ext2_sync_super(sb, sbi->s_es, 1); | |
1298 | ||
1299 | return 0; | |
1300 | } | |
1301 | ||
1302 | static int ext2_unfreeze(struct super_block *sb) | |
1303 | { | |
1304 | /* Just write sb to clear EXT2_VALID_FS flag */ | |
1305 | ext2_write_super(sb); | |
1306 | ||
1307 | return 0; | |
1308 | } | |
40f31dd4 | 1309 | |
65547661 | 1310 | static void ext2_write_super(struct super_block *sb) |
40f31dd4 | 1311 | { |
bc98a42c | 1312 | if (!sb_rdonly(sb)) |
40f31dd4 | 1313 | ext2_sync_fs(sb, 1); |
1da177e4 LT |
1314 | } |
1315 | ||
1316 | static int ext2_remount (struct super_block * sb, int * flags, char * data) | |
1317 | { | |
1318 | struct ext2_sb_info * sbi = EXT2_SB(sb); | |
1319 | struct ext2_super_block * es; | |
08851957 | 1320 | struct ext2_mount_options new_opts; |
50a52234 JK |
1321 | int err; |
1322 | ||
02b9984d | 1323 | sync_filesystem(sb); |
337eb00a | 1324 | |
8af634ff | 1325 | spin_lock(&sbi->s_lock); |
08851957 JK |
1326 | new_opts.s_mount_opt = sbi->s_mount_opt; |
1327 | new_opts.s_resuid = sbi->s_resuid; | |
1328 | new_opts.s_resgid = sbi->s_resgid; | |
8af634ff | 1329 | spin_unlock(&sbi->s_lock); |
1da177e4 | 1330 | |
8af634ff | 1331 | if (!parse_options(data, sb, &new_opts)) |
08851957 | 1332 | return -EINVAL; |
1da177e4 | 1333 | |
8af634ff | 1334 | spin_lock(&sbi->s_lock); |
1da177e4 | 1335 | es = sbi->s_es; |
08851957 | 1336 | if ((sbi->s_mount_opt ^ new_opts.s_mount_opt) & EXT2_MOUNT_DAX) { |
2314b07c | 1337 | ext2_msg(sb, KERN_WARNING, "warning: refusing change of " |
9c3ce9ec | 1338 | "dax flag with busy inodes while remounting"); |
08851957 | 1339 | new_opts.s_mount_opt ^= EXT2_MOUNT_DAX; |
337eb00a | 1340 | } |
1751e8a6 | 1341 | if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb)) |
08851957 | 1342 | goto out_set; |
1751e8a6 | 1343 | if (*flags & SB_RDONLY) { |
1da177e4 | 1344 | if (le16_to_cpu(es->s_state) & EXT2_VALID_FS || |
08851957 JK |
1345 | !(sbi->s_mount_state & EXT2_VALID_FS)) |
1346 | goto out_set; | |
c79d967d | 1347 | |
1da177e4 LT |
1348 | /* |
1349 | * OK, we are remounting a valid rw partition rdonly, so set | |
1350 | * the rdonly flag and then mark the partition as valid again. | |
1351 | */ | |
1352 | es->s_state = cpu_to_le16(sbi->s_mount_state); | |
fe2c3254 | 1353 | es->s_mtime = cpu_to_le32(ktime_get_real_seconds()); |
c15271f4 | 1354 | spin_unlock(&sbi->s_lock); |
c79d967d | 1355 | |
0f0dd62f | 1356 | err = dquot_suspend(sb, -1); |
08851957 JK |
1357 | if (err < 0) |
1358 | return err; | |
c79d967d | 1359 | |
4c96a68b | 1360 | ext2_sync_super(sb, es, 1); |
1da177e4 LT |
1361 | } else { |
1362 | __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb, | |
1363 | ~EXT2_FEATURE_RO_COMPAT_SUPP); | |
1364 | if (ret) { | |
08851957 | 1365 | spin_unlock(&sbi->s_lock); |
2314b07c OR |
1366 | ext2_msg(sb, KERN_WARNING, |
1367 | "warning: couldn't remount RDWR because of " | |
1368 | "unsupported optional features (%x).", | |
1369 | le32_to_cpu(ret)); | |
08851957 | 1370 | return -EROFS; |
1da177e4 LT |
1371 | } |
1372 | /* | |
1373 | * Mounting a RDONLY partition read-write, so reread and | |
1374 | * store the current valid flag. (It may have been changed | |
1375 | * by e2fsck since we originally mounted the partition.) | |
1376 | */ | |
1377 | sbi->s_mount_state = le16_to_cpu(es->s_state); | |
1378 | if (!ext2_setup_super (sb, es, 0)) | |
1751e8a6 | 1379 | sb->s_flags &= ~SB_RDONLY; |
c15271f4 | 1380 | spin_unlock(&sbi->s_lock); |
c79d967d | 1381 | |
4c96a68b | 1382 | ext2_write_super(sb); |
c79d967d | 1383 | |
0f0dd62f | 1384 | dquot_resume(sb, -1); |
1da177e4 | 1385 | } |
c79d967d | 1386 | |
08851957 JK |
1387 | spin_lock(&sbi->s_lock); |
1388 | out_set: | |
1389 | sbi->s_mount_opt = new_opts.s_mount_opt; | |
1390 | sbi->s_resuid = new_opts.s_resuid; | |
1391 | sbi->s_resgid = new_opts.s_resgid; | |
1751e8a6 | 1392 | sb->s_flags = (sb->s_flags & ~SB_POSIXACL) | |
38fa0e8e | 1393 | (test_opt(sb, POSIX_ACL) ? SB_POSIXACL : 0); |
c15271f4 | 1394 | spin_unlock(&sbi->s_lock); |
08851957 JK |
1395 | |
1396 | return 0; | |
1da177e4 LT |
1397 | } |
1398 | ||
726c3342 | 1399 | static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf) |
1da177e4 | 1400 | { |
726c3342 | 1401 | struct super_block *sb = dentry->d_sb; |
1da177e4 | 1402 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
e4fca01e | 1403 | struct ext2_super_block *es = sbi->s_es; |
1da177e4 | 1404 | |
c15271f4 JB |
1405 | spin_lock(&sbi->s_lock); |
1406 | ||
1da177e4 | 1407 | if (test_opt (sb, MINIX_DF)) |
2235219b BP |
1408 | sbi->s_overhead_last = 0; |
1409 | else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) { | |
1410 | unsigned long i, overhead = 0; | |
1411 | smp_rmb(); | |
1412 | ||
1da177e4 | 1413 | /* |
2235219b BP |
1414 | * Compute the overhead (FS structures). This is constant |
1415 | * for a given filesystem unless the number of block groups | |
1416 | * changes so we cache the previous value until it does. | |
1da177e4 LT |
1417 | */ |
1418 | ||
1419 | /* | |
1420 | * All of the blocks before first_data_block are | |
1421 | * overhead | |
1422 | */ | |
e4fca01e | 1423 | overhead = le32_to_cpu(es->s_first_data_block); |
1da177e4 LT |
1424 | |
1425 | /* | |
1426 | * Add the overhead attributed to the superblock and | |
1427 | * block group descriptors. If the sparse superblocks | |
1428 | * feature is turned on, then not all groups have this. | |
1429 | */ | |
1430 | for (i = 0; i < sbi->s_groups_count; i++) | |
1431 | overhead += ext2_bg_has_super(sb, i) + | |
1432 | ext2_bg_num_gdb(sb, i); | |
1433 | ||
1434 | /* | |
1435 | * Every block group has an inode bitmap, a block | |
1436 | * bitmap, and an inode table. | |
1437 | */ | |
1438 | overhead += (sbi->s_groups_count * | |
1439 | (2 + sbi->s_itb_per_group)); | |
2235219b BP |
1440 | sbi->s_overhead_last = overhead; |
1441 | smp_wmb(); | |
1442 | sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count); | |
1da177e4 LT |
1443 | } |
1444 | ||
1445 | buf->f_type = EXT2_SUPER_MAGIC; | |
1446 | buf->f_bsize = sb->s_blocksize; | |
2235219b | 1447 | buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last; |
1da177e4 | 1448 | buf->f_bfree = ext2_count_free_blocks(sb); |
2235219b | 1449 | es->s_free_blocks_count = cpu_to_le32(buf->f_bfree); |
e4fca01e PE |
1450 | buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count); |
1451 | if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count)) | |
1da177e4 | 1452 | buf->f_bavail = 0; |
e4fca01e PE |
1453 | buf->f_files = le32_to_cpu(es->s_inodes_count); |
1454 | buf->f_ffree = ext2_count_free_inodes(sb); | |
2235219b | 1455 | es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); |
1da177e4 | 1456 | buf->f_namelen = EXT2_NAME_LEN; |
9591c3a3 | 1457 | buf->f_fsid = uuid_to_fsid(es->s_uuid); |
c15271f4 | 1458 | spin_unlock(&sbi->s_lock); |
1da177e4 LT |
1459 | return 0; |
1460 | } | |
1461 | ||
152a0836 AV |
1462 | static struct dentry *ext2_mount(struct file_system_type *fs_type, |
1463 | int flags, const char *dev_name, void *data) | |
1da177e4 | 1464 | { |
152a0836 | 1465 | return mount_bdev(fs_type, flags, dev_name, data, ext2_fill_super); |
1da177e4 LT |
1466 | } |
1467 | ||
1468 | #ifdef CONFIG_QUOTA | |
1469 | ||
1470 | /* Read data from quotafile - avoid pagecache and such because we cannot afford | |
1471 | * acquiring the locks... As quota files are never truncated and quota code | |
25985edc | 1472 | * itself serializes the operations (and no one else should touch the files) |
1da177e4 LT |
1473 | * we don't have to be afraid of races */ |
1474 | static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, | |
1475 | size_t len, loff_t off) | |
1476 | { | |
1477 | struct inode *inode = sb_dqopt(sb)->files[type]; | |
1478 | sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); | |
1479 | int err = 0; | |
1480 | int offset = off & (sb->s_blocksize - 1); | |
1481 | int tocopy; | |
1482 | size_t toread; | |
1483 | struct buffer_head tmp_bh; | |
1484 | struct buffer_head *bh; | |
1485 | loff_t i_size = i_size_read(inode); | |
1486 | ||
1487 | if (off > i_size) | |
1488 | return 0; | |
1489 | if (off+len > i_size) | |
1490 | len = i_size-off; | |
1491 | toread = len; | |
1492 | while (toread > 0) { | |
1493 | tocopy = sb->s_blocksize - offset < toread ? | |
1494 | sb->s_blocksize - offset : toread; | |
1495 | ||
1496 | tmp_bh.b_state = 0; | |
c16831b4 | 1497 | tmp_bh.b_size = sb->s_blocksize; |
1da177e4 | 1498 | err = ext2_get_block(inode, blk, &tmp_bh, 0); |
a686cd89 | 1499 | if (err < 0) |
1da177e4 LT |
1500 | return err; |
1501 | if (!buffer_mapped(&tmp_bh)) /* A hole? */ | |
1502 | memset(data, 0, tocopy); | |
1503 | else { | |
1504 | bh = sb_bread(sb, tmp_bh.b_blocknr); | |
1505 | if (!bh) | |
1506 | return -EIO; | |
1507 | memcpy(data, bh->b_data+offset, tocopy); | |
1508 | brelse(bh); | |
1509 | } | |
1510 | offset = 0; | |
1511 | toread -= tocopy; | |
1512 | data += tocopy; | |
1513 | blk++; | |
1514 | } | |
1515 | return len; | |
1516 | } | |
1517 | ||
1518 | /* Write to quotafile */ | |
1519 | static ssize_t ext2_quota_write(struct super_block *sb, int type, | |
1520 | const char *data, size_t len, loff_t off) | |
1521 | { | |
1522 | struct inode *inode = sb_dqopt(sb)->files[type]; | |
1523 | sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); | |
1524 | int err = 0; | |
1525 | int offset = off & (sb->s_blocksize - 1); | |
1526 | int tocopy; | |
1527 | size_t towrite = len; | |
1528 | struct buffer_head tmp_bh; | |
1529 | struct buffer_head *bh; | |
1530 | ||
1da177e4 LT |
1531 | while (towrite > 0) { |
1532 | tocopy = sb->s_blocksize - offset < towrite ? | |
1533 | sb->s_blocksize - offset : towrite; | |
1534 | ||
1535 | tmp_bh.b_state = 0; | |
df4e7ac0 | 1536 | tmp_bh.b_size = sb->s_blocksize; |
1da177e4 | 1537 | err = ext2_get_block(inode, blk, &tmp_bh, 1); |
a686cd89 | 1538 | if (err < 0) |
1da177e4 LT |
1539 | goto out; |
1540 | if (offset || tocopy != EXT2_BLOCK_SIZE(sb)) | |
1541 | bh = sb_bread(sb, tmp_bh.b_blocknr); | |
1542 | else | |
1543 | bh = sb_getblk(sb, tmp_bh.b_blocknr); | |
2b0542a4 | 1544 | if (unlikely(!bh)) { |
1da177e4 LT |
1545 | err = -EIO; |
1546 | goto out; | |
1547 | } | |
1548 | lock_buffer(bh); | |
1549 | memcpy(bh->b_data+offset, data, tocopy); | |
1550 | flush_dcache_page(bh->b_page); | |
1551 | set_buffer_uptodate(bh); | |
1552 | mark_buffer_dirty(bh); | |
1553 | unlock_buffer(bh); | |
1554 | brelse(bh); | |
1555 | offset = 0; | |
1556 | towrite -= tocopy; | |
1557 | data += tocopy; | |
1558 | blk++; | |
1559 | } | |
1560 | out: | |
e2a3fde7 | 1561 | if (len == towrite) |
1da177e4 LT |
1562 | return err; |
1563 | if (inode->i_size < off+len-towrite) | |
1564 | i_size_write(inode, off+len-towrite); | |
e1d747d9 | 1565 | inode_inc_iversion(inode); |
078cd827 | 1566 | inode->i_mtime = inode->i_ctime = current_time(inode); |
1da177e4 | 1567 | mark_inode_dirty(inode); |
1da177e4 LT |
1568 | return len - towrite; |
1569 | } | |
1570 | ||
161f3b74 JK |
1571 | static int ext2_quota_on(struct super_block *sb, int type, int format_id, |
1572 | const struct path *path) | |
1573 | { | |
1574 | int err; | |
1575 | struct inode *inode; | |
1576 | ||
1577 | err = dquot_quota_on(sb, type, format_id, path); | |
1578 | if (err) | |
1579 | return err; | |
1580 | ||
1581 | inode = d_inode(path->dentry); | |
1582 | inode_lock(inode); | |
1583 | EXT2_I(inode)->i_flags |= EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL; | |
1584 | inode_set_flags(inode, S_NOATIME | S_IMMUTABLE, | |
1585 | S_NOATIME | S_IMMUTABLE); | |
1586 | inode_unlock(inode); | |
1587 | mark_inode_dirty(inode); | |
1588 | ||
1589 | return 0; | |
1590 | } | |
1591 | ||
1592 | static int ext2_quota_off(struct super_block *sb, int type) | |
1593 | { | |
1594 | struct inode *inode = sb_dqopt(sb)->files[type]; | |
1595 | int err; | |
1596 | ||
1597 | if (!inode || !igrab(inode)) | |
1598 | goto out; | |
1599 | ||
1600 | err = dquot_quota_off(sb, type); | |
1601 | if (err) | |
1602 | goto out_put; | |
1603 | ||
1604 | inode_lock(inode); | |
1605 | EXT2_I(inode)->i_flags &= ~(EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL); | |
1606 | inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE); | |
1607 | inode_unlock(inode); | |
1608 | mark_inode_dirty(inode); | |
1609 | out_put: | |
1610 | iput(inode); | |
1611 | return err; | |
1612 | out: | |
1613 | return dquot_quota_off(sb, type); | |
1614 | } | |
1615 | ||
1da177e4 LT |
1616 | #endif |
1617 | ||
1618 | static struct file_system_type ext2_fs_type = { | |
1619 | .owner = THIS_MODULE, | |
1620 | .name = "ext2", | |
152a0836 | 1621 | .mount = ext2_mount, |
1da177e4 | 1622 | .kill_sb = kill_block_super, |
46b15caa | 1623 | .fs_flags = FS_REQUIRES_DEV, |
1da177e4 | 1624 | }; |
7f78e035 | 1625 | MODULE_ALIAS_FS("ext2"); |
1da177e4 LT |
1626 | |
1627 | static int __init init_ext2_fs(void) | |
1628 | { | |
be0726d3 JK |
1629 | int err; |
1630 | ||
1da177e4 LT |
1631 | err = init_inodecache(); |
1632 | if (err) | |
be0726d3 | 1633 | return err; |
1da177e4 LT |
1634 | err = register_filesystem(&ext2_fs_type); |
1635 | if (err) | |
1636 | goto out; | |
1637 | return 0; | |
1638 | out: | |
1639 | destroy_inodecache(); | |
1da177e4 LT |
1640 | return err; |
1641 | } | |
1642 | ||
1643 | static void __exit exit_ext2_fs(void) | |
1644 | { | |
1645 | unregister_filesystem(&ext2_fs_type); | |
1646 | destroy_inodecache(); | |
1da177e4 LT |
1647 | } |
1648 | ||
302bf2f3 PG |
1649 | MODULE_AUTHOR("Remy Card and others"); |
1650 | MODULE_DESCRIPTION("Second Extended Filesystem"); | |
1651 | MODULE_LICENSE("GPL"); | |
1da177e4 LT |
1652 | module_init(init_ext2_fs) |
1653 | module_exit(exit_ext2_fs) |