Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * linux/fs/ext2/super.c | |
3 | * | |
4 | * Copyright (C) 1992, 1993, 1994, 1995 | |
5 | * Remy Card (card@masi.ibp.fr) | |
6 | * Laboratoire MASI - Institut Blaise Pascal | |
7 | * Universite Pierre et Marie Curie (Paris VI) | |
8 | * | |
9 | * from | |
10 | * | |
11 | * linux/fs/minix/inode.c | |
12 | * | |
13 | * Copyright (C) 1991, 1992 Linus Torvalds | |
14 | * | |
15 | * Big-endian to little-endian byte-swapping/bitmaps by | |
16 | * David S. Miller (davem@caip.rutgers.edu), 1995 | |
17 | */ | |
18 | ||
1da177e4 LT |
19 | #include <linux/module.h> |
20 | #include <linux/string.h> | |
8fc2751b | 21 | #include <linux/fs.h> |
1da177e4 LT |
22 | #include <linux/slab.h> |
23 | #include <linux/init.h> | |
24 | #include <linux/blkdev.h> | |
25 | #include <linux/parser.h> | |
26 | #include <linux/random.h> | |
27 | #include <linux/buffer_head.h> | |
a5694255 | 28 | #include <linux/exportfs.h> |
1da177e4 | 29 | #include <linux/vfs.h> |
8fc2751b MB |
30 | #include <linux/seq_file.h> |
31 | #include <linux/mount.h> | |
d8ea6cf8 | 32 | #include <linux/log2.h> |
74abb989 | 33 | #include <linux/quotaops.h> |
7c0f6ba6 | 34 | #include <linux/uaccess.h> |
ef510424 | 35 | #include <linux/dax.h> |
e1d747d9 | 36 | #include <linux/iversion.h> |
1da177e4 LT |
37 | #include "ext2.h" |
38 | #include "xattr.h" | |
39 | #include "acl.h" | |
40 | ||
65547661 | 41 | static void ext2_write_super(struct super_block *sb); |
1da177e4 | 42 | static int ext2_remount (struct super_block * sb, int * flags, char * data); |
726c3342 | 43 | static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf); |
40f31dd4 | 44 | static int ext2_sync_fs(struct super_block *sb, int wait); |
1e8b212f JK |
45 | static int ext2_freeze(struct super_block *sb); |
46 | static int ext2_unfreeze(struct super_block *sb); | |
1da177e4 | 47 | |
23a2ad6d JP |
48 | void ext2_error(struct super_block *sb, const char *function, |
49 | const char *fmt, ...) | |
1da177e4 | 50 | { |
23a2ad6d | 51 | struct va_format vaf; |
1da177e4 LT |
52 | va_list args; |
53 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
54 | struct ext2_super_block *es = sbi->s_es; | |
55 | ||
bc98a42c | 56 | if (!sb_rdonly(sb)) { |
c15271f4 | 57 | spin_lock(&sbi->s_lock); |
1da177e4 | 58 | sbi->s_mount_state |= EXT2_ERROR_FS; |
31f68e13 | 59 | es->s_state |= cpu_to_le16(EXT2_ERROR_FS); |
c15271f4 | 60 | spin_unlock(&sbi->s_lock); |
ee6921eb | 61 | ext2_sync_super(sb, es, 1); |
1da177e4 LT |
62 | } |
63 | ||
64 | va_start(args, fmt); | |
23a2ad6d JP |
65 | |
66 | vaf.fmt = fmt; | |
67 | vaf.va = &args; | |
68 | ||
69 | printk(KERN_CRIT "EXT2-fs (%s): error: %s: %pV\n", | |
70 | sb->s_id, function, &vaf); | |
71 | ||
1da177e4 LT |
72 | va_end(args); |
73 | ||
74 | if (test_opt(sb, ERRORS_PANIC)) | |
2314b07c | 75 | panic("EXT2-fs: panic from previous error\n"); |
c0ed7b51 | 76 | if (!sb_rdonly(sb) && test_opt(sb, ERRORS_RO)) { |
2314b07c AF |
77 | ext2_msg(sb, KERN_CRIT, |
78 | "error: remounting filesystem read-only"); | |
1751e8a6 | 79 | sb->s_flags |= SB_RDONLY; |
1da177e4 LT |
80 | } |
81 | } | |
82 | ||
2314b07c AF |
83 | void ext2_msg(struct super_block *sb, const char *prefix, |
84 | const char *fmt, ...) | |
1da177e4 | 85 | { |
23a2ad6d | 86 | struct va_format vaf; |
1da177e4 LT |
87 | va_list args; |
88 | ||
89 | va_start(args, fmt); | |
23a2ad6d JP |
90 | |
91 | vaf.fmt = fmt; | |
92 | vaf.va = &args; | |
93 | ||
94 | printk("%sEXT2-fs (%s): %pV\n", prefix, sb->s_id, &vaf); | |
95 | ||
1da177e4 LT |
96 | va_end(args); |
97 | } | |
98 | ||
c15271f4 JB |
99 | /* |
100 | * This must be called with sbi->s_lock held. | |
101 | */ | |
1da177e4 LT |
102 | void ext2_update_dynamic_rev(struct super_block *sb) |
103 | { | |
104 | struct ext2_super_block *es = EXT2_SB(sb)->s_es; | |
105 | ||
106 | if (le32_to_cpu(es->s_rev_level) > EXT2_GOOD_OLD_REV) | |
107 | return; | |
108 | ||
2314b07c AF |
109 | ext2_msg(sb, KERN_WARNING, |
110 | "warning: updating to rev %d because of " | |
111 | "new feature flag, running e2fsck is recommended", | |
1da177e4 LT |
112 | EXT2_DYNAMIC_REV); |
113 | ||
114 | es->s_first_ino = cpu_to_le32(EXT2_GOOD_OLD_FIRST_INO); | |
115 | es->s_inode_size = cpu_to_le16(EXT2_GOOD_OLD_INODE_SIZE); | |
116 | es->s_rev_level = cpu_to_le32(EXT2_DYNAMIC_REV); | |
117 | /* leave es->s_feature_*compat flags alone */ | |
118 | /* es->s_uuid will be set by e2fsck if empty */ | |
119 | ||
120 | /* | |
121 | * The rest of the superblock fields should be zero, and if not it | |
122 | * means they are likely already in use, so leave them alone. We | |
123 | * can leave it up to e2fsck to clean up any inconsistencies there. | |
124 | */ | |
125 | } | |
126 | ||
161f3b74 JK |
127 | #ifdef CONFIG_QUOTA |
128 | static int ext2_quota_off(struct super_block *sb, int type); | |
129 | ||
130 | static void ext2_quota_off_umount(struct super_block *sb) | |
131 | { | |
132 | int type; | |
133 | ||
134 | for (type = 0; type < MAXQUOTAS; type++) | |
135 | ext2_quota_off(sb, type); | |
136 | } | |
137 | #else | |
138 | static inline void ext2_quota_off_umount(struct super_block *sb) | |
139 | { | |
140 | } | |
141 | #endif | |
142 | ||
1da177e4 LT |
143 | static void ext2_put_super (struct super_block * sb) |
144 | { | |
145 | int db_count; | |
146 | int i; | |
147 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
148 | ||
161f3b74 | 149 | ext2_quota_off_umount(sb); |
e0ccfd95 | 150 | |
569ae920 CX |
151 | ext2_xattr_destroy_cache(sbi->s_ea_block_cache); |
152 | sbi->s_ea_block_cache = NULL; | |
153 | ||
bc98a42c | 154 | if (!sb_rdonly(sb)) { |
1da177e4 LT |
155 | struct ext2_super_block *es = sbi->s_es; |
156 | ||
c15271f4 | 157 | spin_lock(&sbi->s_lock); |
1da177e4 | 158 | es->s_state = cpu_to_le16(sbi->s_mount_state); |
c15271f4 | 159 | spin_unlock(&sbi->s_lock); |
ee6921eb | 160 | ext2_sync_super(sb, es, 1); |
1da177e4 LT |
161 | } |
162 | db_count = sbi->s_gdb_count; | |
163 | for (i = 0; i < db_count; i++) | |
164 | if (sbi->s_group_desc[i]) | |
165 | brelse (sbi->s_group_desc[i]); | |
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 | ||
fa0d7e3d | 195 | static void ext2_i_callback(struct rcu_head *head) |
1da177e4 | 196 | { |
fa0d7e3d | 197 | struct inode *inode = container_of(head, struct inode, i_rcu); |
1da177e4 LT |
198 | kmem_cache_free(ext2_inode_cachep, EXT2_I(inode)); |
199 | } | |
200 | ||
fa0d7e3d NP |
201 | static void ext2_destroy_inode(struct inode *inode) |
202 | { | |
203 | call_rcu(&inode->i_rcu, ext2_i_callback); | |
204 | } | |
205 | ||
51cc5068 | 206 | static void init_once(void *foo) |
1da177e4 LT |
207 | { |
208 | struct ext2_inode_info *ei = (struct ext2_inode_info *) foo; | |
209 | ||
a35afb83 | 210 | rwlock_init(&ei->i_meta_lock); |
1da177e4 | 211 | #ifdef CONFIG_EXT2_FS_XATTR |
a35afb83 | 212 | init_rwsem(&ei->xattr_sem); |
1da177e4 | 213 | #endif |
a686cd89 | 214 | mutex_init(&ei->truncate_mutex); |
5726b27b RZ |
215 | #ifdef CONFIG_FS_DAX |
216 | init_rwsem(&ei->dax_sem); | |
217 | #endif | |
a35afb83 | 218 | inode_init_once(&ei->vfs_inode); |
1da177e4 | 219 | } |
20c2df83 | 220 | |
0903353a | 221 | static int __init init_inodecache(void) |
1da177e4 | 222 | { |
85212d4e DW |
223 | ext2_inode_cachep = kmem_cache_create_usercopy("ext2_inode_cache", |
224 | sizeof(struct ext2_inode_info), 0, | |
225 | (SLAB_RECLAIM_ACCOUNT|SLAB_MEM_SPREAD| | |
226 | SLAB_ACCOUNT), | |
227 | offsetof(struct ext2_inode_info, i_data), | |
228 | sizeof_field(struct ext2_inode_info, i_data), | |
229 | init_once); | |
1da177e4 LT |
230 | if (ext2_inode_cachep == NULL) |
231 | return -ENOMEM; | |
232 | return 0; | |
233 | } | |
234 | ||
235 | static void destroy_inodecache(void) | |
236 | { | |
8c0a8537 KS |
237 | /* |
238 | * Make sure all delayed rcu free inodes are flushed before we | |
239 | * destroy cache. | |
240 | */ | |
241 | rcu_barrier(); | |
1a1d92c1 | 242 | kmem_cache_destroy(ext2_inode_cachep); |
1da177e4 LT |
243 | } |
244 | ||
34c80b1d | 245 | static int ext2_show_options(struct seq_file *seq, struct dentry *root) |
8fc2751b | 246 | { |
34c80b1d | 247 | struct super_block *sb = root->d_sb; |
93d44cb2 MS |
248 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
249 | struct ext2_super_block *es = sbi->s_es; | |
250 | unsigned long def_mount_opts; | |
8fc2751b | 251 | |
c15271f4 | 252 | spin_lock(&sbi->s_lock); |
93d44cb2 MS |
253 | def_mount_opts = le32_to_cpu(es->s_default_mount_opts); |
254 | ||
255 | if (sbi->s_sb_block != 1) | |
256 | seq_printf(seq, ",sb=%lu", sbi->s_sb_block); | |
257 | if (test_opt(sb, MINIX_DF)) | |
258 | seq_puts(seq, ",minixdf"); | |
259 | if (test_opt(sb, GRPID)) | |
8fc2751b | 260 | seq_puts(seq, ",grpid"); |
93d44cb2 MS |
261 | if (!test_opt(sb, GRPID) && (def_mount_opts & EXT2_DEFM_BSDGROUPS)) |
262 | seq_puts(seq, ",nogrpid"); | |
b8a9f9e1 | 263 | if (!uid_eq(sbi->s_resuid, make_kuid(&init_user_ns, EXT2_DEF_RESUID)) || |
93d44cb2 | 264 | le16_to_cpu(es->s_def_resuid) != EXT2_DEF_RESUID) { |
b8a9f9e1 EB |
265 | seq_printf(seq, ",resuid=%u", |
266 | from_kuid_munged(&init_user_ns, sbi->s_resuid)); | |
93d44cb2 | 267 | } |
b8a9f9e1 | 268 | if (!gid_eq(sbi->s_resgid, make_kgid(&init_user_ns, EXT2_DEF_RESGID)) || |
93d44cb2 | 269 | le16_to_cpu(es->s_def_resgid) != EXT2_DEF_RESGID) { |
b8a9f9e1 EB |
270 | seq_printf(seq, ",resgid=%u", |
271 | from_kgid_munged(&init_user_ns, sbi->s_resgid)); | |
93d44cb2 | 272 | } |
14e11e10 | 273 | if (test_opt(sb, ERRORS_RO)) { |
93d44cb2 MS |
274 | int def_errors = le16_to_cpu(es->s_errors); |
275 | ||
276 | if (def_errors == EXT2_ERRORS_PANIC || | |
14e11e10 AK |
277 | def_errors == EXT2_ERRORS_CONTINUE) { |
278 | seq_puts(seq, ",errors=remount-ro"); | |
93d44cb2 MS |
279 | } |
280 | } | |
14e11e10 AK |
281 | if (test_opt(sb, ERRORS_CONT)) |
282 | seq_puts(seq, ",errors=continue"); | |
93d44cb2 MS |
283 | if (test_opt(sb, ERRORS_PANIC)) |
284 | seq_puts(seq, ",errors=panic"); | |
285 | if (test_opt(sb, NO_UID32)) | |
286 | seq_puts(seq, ",nouid32"); | |
287 | if (test_opt(sb, DEBUG)) | |
288 | seq_puts(seq, ",debug"); | |
289 | if (test_opt(sb, OLDALLOC)) | |
290 | seq_puts(seq, ",oldalloc"); | |
291 | ||
292 | #ifdef CONFIG_EXT2_FS_XATTR | |
293 | if (test_opt(sb, XATTR_USER)) | |
294 | seq_puts(seq, ",user_xattr"); | |
295 | if (!test_opt(sb, XATTR_USER) && | |
296 | (def_mount_opts & EXT2_DEFM_XATTR_USER)) { | |
297 | seq_puts(seq, ",nouser_xattr"); | |
298 | } | |
299 | #endif | |
300 | ||
301 | #ifdef CONFIG_EXT2_FS_POSIX_ACL | |
302 | if (test_opt(sb, POSIX_ACL)) | |
303 | seq_puts(seq, ",acl"); | |
304 | if (!test_opt(sb, POSIX_ACL) && (def_mount_opts & EXT2_DEFM_ACL)) | |
305 | seq_puts(seq, ",noacl"); | |
306 | #endif | |
307 | ||
308 | if (test_opt(sb, NOBH)) | |
309 | seq_puts(seq, ",nobh"); | |
8fc2751b | 310 | |
8fc2751b MB |
311 | if (sbi->s_mount_opt & EXT2_MOUNT_USRQUOTA) |
312 | seq_puts(seq, ",usrquota"); | |
313 | ||
314 | if (sbi->s_mount_opt & EXT2_MOUNT_GRPQUOTA) | |
315 | seq_puts(seq, ",grpquota"); | |
8fc2751b | 316 | |
83541796 CO |
317 | if (sbi->s_mount_opt & EXT2_MOUNT_XIP) |
318 | seq_puts(seq, ",xip"); | |
2aad26fa | 319 | |
9c3ce9ec MW |
320 | if (sbi->s_mount_opt & EXT2_MOUNT_DAX) |
321 | seq_puts(seq, ",dax"); | |
83541796 | 322 | |
35c879dc MS |
323 | if (!test_opt(sb, RESERVATION)) |
324 | seq_puts(seq, ",noreservation"); | |
325 | ||
c15271f4 | 326 | spin_unlock(&sbi->s_lock); |
8fc2751b MB |
327 | return 0; |
328 | } | |
329 | ||
1da177e4 LT |
330 | #ifdef CONFIG_QUOTA |
331 | static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, size_t len, loff_t off); | |
332 | static ssize_t ext2_quota_write(struct super_block *sb, int type, const char *data, size_t len, loff_t off); | |
161f3b74 JK |
333 | static int ext2_quota_on(struct super_block *sb, int type, int format_id, |
334 | const struct path *path); | |
64241118 JK |
335 | static struct dquot **ext2_get_dquots(struct inode *inode) |
336 | { | |
337 | return EXT2_I(inode)->i_dquot; | |
338 | } | |
161f3b74 JK |
339 | |
340 | static const struct quotactl_ops ext2_quotactl_ops = { | |
341 | .quota_on = ext2_quota_on, | |
342 | .quota_off = ext2_quota_off, | |
343 | .quota_sync = dquot_quota_sync, | |
344 | .get_state = dquot_get_state, | |
345 | .set_info = dquot_set_dqinfo, | |
346 | .get_dqblk = dquot_get_dqblk, | |
347 | .set_dqblk = dquot_set_dqblk, | |
348 | .get_nextdqblk = dquot_get_next_dqblk, | |
349 | }; | |
1da177e4 LT |
350 | #endif |
351 | ||
ee9b6d61 | 352 | static const struct super_operations ext2_sops = { |
1da177e4 LT |
353 | .alloc_inode = ext2_alloc_inode, |
354 | .destroy_inode = ext2_destroy_inode, | |
1da177e4 | 355 | .write_inode = ext2_write_inode, |
72edc4d0 | 356 | .evict_inode = ext2_evict_inode, |
1da177e4 | 357 | .put_super = ext2_put_super, |
40f31dd4 | 358 | .sync_fs = ext2_sync_fs, |
1e8b212f JK |
359 | .freeze_fs = ext2_freeze, |
360 | .unfreeze_fs = ext2_unfreeze, | |
1da177e4 LT |
361 | .statfs = ext2_statfs, |
362 | .remount_fs = ext2_remount, | |
8fc2751b | 363 | .show_options = ext2_show_options, |
1da177e4 LT |
364 | #ifdef CONFIG_QUOTA |
365 | .quota_read = ext2_quota_read, | |
366 | .quota_write = ext2_quota_write, | |
64241118 | 367 | .get_dquots = ext2_get_dquots, |
1da177e4 LT |
368 | #endif |
369 | }; | |
370 | ||
2e4c68e3 CH |
371 | static struct inode *ext2_nfs_get_inode(struct super_block *sb, |
372 | u64 ino, u32 generation) | |
ecaff756 | 373 | { |
ecaff756 | 374 | struct inode *inode; |
ecaff756 N |
375 | |
376 | if (ino < EXT2_FIRST_INO(sb) && ino != EXT2_ROOT_INO) | |
377 | return ERR_PTR(-ESTALE); | |
378 | if (ino > le32_to_cpu(EXT2_SB(sb)->s_es->s_inodes_count)) | |
379 | return ERR_PTR(-ESTALE); | |
380 | ||
f32948dd LH |
381 | /* |
382 | * ext2_iget isn't quite right if the inode is currently unallocated! | |
383 | * However ext2_iget currently does appropriate checks to handle stale | |
384 | * inodes so everything is OK. | |
ecaff756 | 385 | */ |
52fcf703 DH |
386 | inode = ext2_iget(sb, ino); |
387 | if (IS_ERR(inode)) | |
388 | return ERR_CAST(inode); | |
389 | if (generation && inode->i_generation != generation) { | |
ecaff756 N |
390 | /* we didn't find the right inode.. */ |
391 | iput(inode); | |
392 | return ERR_PTR(-ESTALE); | |
393 | } | |
2e4c68e3 CH |
394 | return inode; |
395 | } | |
396 | ||
397 | static struct dentry *ext2_fh_to_dentry(struct super_block *sb, struct fid *fid, | |
398 | int fh_len, int fh_type) | |
399 | { | |
400 | return generic_fh_to_dentry(sb, fid, fh_len, fh_type, | |
401 | ext2_nfs_get_inode); | |
402 | } | |
403 | ||
404 | static struct dentry *ext2_fh_to_parent(struct super_block *sb, struct fid *fid, | |
405 | int fh_len, int fh_type) | |
406 | { | |
407 | return generic_fh_to_parent(sb, fid, fh_len, fh_type, | |
408 | ext2_nfs_get_inode); | |
ecaff756 N |
409 | } |
410 | ||
39655164 | 411 | static const struct export_operations ext2_export_ops = { |
2e4c68e3 CH |
412 | .fh_to_dentry = ext2_fh_to_dentry, |
413 | .fh_to_parent = ext2_fh_to_parent, | |
1da177e4 LT |
414 | .get_parent = ext2_get_parent, |
415 | }; | |
416 | ||
417 | static unsigned long get_sb_block(void **data) | |
418 | { | |
419 | unsigned long sb_block; | |
420 | char *options = (char *) *data; | |
421 | ||
422 | if (!options || strncmp(options, "sb=", 3) != 0) | |
423 | return 1; /* Default location */ | |
424 | options += 3; | |
425 | sb_block = simple_strtoul(options, &options, 0); | |
426 | if (*options && *options != ',') { | |
427 | printk("EXT2-fs: Invalid sb specification: %s\n", | |
428 | (char *) *data); | |
429 | return 1; | |
430 | } | |
431 | if (*options == ',') | |
432 | options++; | |
433 | *data = (void *) options; | |
434 | return sb_block; | |
435 | } | |
436 | ||
437 | enum { | |
438 | Opt_bsd_df, Opt_minix_df, Opt_grpid, Opt_nogrpid, | |
8fc2751b | 439 | Opt_resgid, Opt_resuid, Opt_sb, Opt_err_cont, Opt_err_panic, |
2860b733 | 440 | Opt_err_ro, Opt_nouid32, Opt_nocheck, Opt_debug, |
8fc2751b | 441 | Opt_oldalloc, Opt_orlov, Opt_nobh, Opt_user_xattr, Opt_nouser_xattr, |
9c3ce9ec | 442 | Opt_acl, Opt_noacl, Opt_xip, Opt_dax, Opt_ignore, Opt_err, Opt_quota, |
a686cd89 | 443 | Opt_usrquota, Opt_grpquota, Opt_reservation, Opt_noreservation |
1da177e4 LT |
444 | }; |
445 | ||
a447c093 | 446 | static const match_table_t tokens = { |
1da177e4 LT |
447 | {Opt_bsd_df, "bsddf"}, |
448 | {Opt_minix_df, "minixdf"}, | |
449 | {Opt_grpid, "grpid"}, | |
450 | {Opt_grpid, "bsdgroups"}, | |
451 | {Opt_nogrpid, "nogrpid"}, | |
452 | {Opt_nogrpid, "sysvgroups"}, | |
453 | {Opt_resgid, "resgid=%u"}, | |
454 | {Opt_resuid, "resuid=%u"}, | |
455 | {Opt_sb, "sb=%u"}, | |
456 | {Opt_err_cont, "errors=continue"}, | |
457 | {Opt_err_panic, "errors=panic"}, | |
458 | {Opt_err_ro, "errors=remount-ro"}, | |
459 | {Opt_nouid32, "nouid32"}, | |
460 | {Opt_nocheck, "check=none"}, | |
461 | {Opt_nocheck, "nocheck"}, | |
1da177e4 LT |
462 | {Opt_debug, "debug"}, |
463 | {Opt_oldalloc, "oldalloc"}, | |
464 | {Opt_orlov, "orlov"}, | |
465 | {Opt_nobh, "nobh"}, | |
466 | {Opt_user_xattr, "user_xattr"}, | |
467 | {Opt_nouser_xattr, "nouser_xattr"}, | |
468 | {Opt_acl, "acl"}, | |
469 | {Opt_noacl, "noacl"}, | |
6d79125b | 470 | {Opt_xip, "xip"}, |
9c3ce9ec | 471 | {Opt_dax, "dax"}, |
8fc2751b | 472 | {Opt_grpquota, "grpquota"}, |
1da177e4 | 473 | {Opt_ignore, "noquota"}, |
8fc2751b MB |
474 | {Opt_quota, "quota"}, |
475 | {Opt_usrquota, "usrquota"}, | |
a686cd89 MB |
476 | {Opt_reservation, "reservation"}, |
477 | {Opt_noreservation, "noreservation"}, | |
1da177e4 LT |
478 | {Opt_err, NULL} |
479 | }; | |
480 | ||
08851957 JK |
481 | static int parse_options(char *options, struct super_block *sb, |
482 | struct ext2_mount_options *opts) | |
1da177e4 | 483 | { |
2314b07c | 484 | char *p; |
1da177e4 | 485 | substring_t args[MAX_OPT_ARGS]; |
1da177e4 | 486 | int option; |
b8a9f9e1 EB |
487 | kuid_t uid; |
488 | kgid_t gid; | |
1da177e4 LT |
489 | |
490 | if (!options) | |
491 | return 1; | |
492 | ||
493 | while ((p = strsep (&options, ",")) != NULL) { | |
494 | int token; | |
495 | if (!*p) | |
496 | continue; | |
497 | ||
498 | token = match_token(p, tokens, args); | |
499 | switch (token) { | |
500 | case Opt_bsd_df: | |
08851957 | 501 | clear_opt (opts->s_mount_opt, MINIX_DF); |
1da177e4 LT |
502 | break; |
503 | case Opt_minix_df: | |
08851957 | 504 | set_opt (opts->s_mount_opt, MINIX_DF); |
1da177e4 LT |
505 | break; |
506 | case Opt_grpid: | |
08851957 | 507 | set_opt (opts->s_mount_opt, GRPID); |
1da177e4 LT |
508 | break; |
509 | case Opt_nogrpid: | |
08851957 | 510 | clear_opt (opts->s_mount_opt, GRPID); |
1da177e4 LT |
511 | break; |
512 | case Opt_resuid: | |
513 | if (match_int(&args[0], &option)) | |
514 | return 0; | |
b8a9f9e1 EB |
515 | uid = make_kuid(current_user_ns(), option); |
516 | if (!uid_valid(uid)) { | |
517 | ext2_msg(sb, KERN_ERR, "Invalid uid value %d", option); | |
ae2cf428 | 518 | return 0; |
b8a9f9e1 EB |
519 | |
520 | } | |
08851957 | 521 | opts->s_resuid = uid; |
1da177e4 LT |
522 | break; |
523 | case Opt_resgid: | |
524 | if (match_int(&args[0], &option)) | |
525 | return 0; | |
b8a9f9e1 EB |
526 | gid = make_kgid(current_user_ns(), option); |
527 | if (!gid_valid(gid)) { | |
528 | ext2_msg(sb, KERN_ERR, "Invalid gid value %d", option); | |
ae2cf428 | 529 | return 0; |
b8a9f9e1 | 530 | } |
08851957 | 531 | opts->s_resgid = gid; |
1da177e4 LT |
532 | break; |
533 | case Opt_sb: | |
534 | /* handled by get_sb_block() instead of here */ | |
535 | /* *sb_block = match_int(&args[0]); */ | |
536 | break; | |
537 | case Opt_err_panic: | |
08851957 JK |
538 | clear_opt (opts->s_mount_opt, ERRORS_CONT); |
539 | clear_opt (opts->s_mount_opt, ERRORS_RO); | |
540 | set_opt (opts->s_mount_opt, ERRORS_PANIC); | |
1da177e4 LT |
541 | break; |
542 | case Opt_err_ro: | |
08851957 JK |
543 | clear_opt (opts->s_mount_opt, ERRORS_CONT); |
544 | clear_opt (opts->s_mount_opt, ERRORS_PANIC); | |
545 | set_opt (opts->s_mount_opt, ERRORS_RO); | |
1da177e4 LT |
546 | break; |
547 | case Opt_err_cont: | |
08851957 JK |
548 | clear_opt (opts->s_mount_opt, ERRORS_RO); |
549 | clear_opt (opts->s_mount_opt, ERRORS_PANIC); | |
550 | set_opt (opts->s_mount_opt, ERRORS_CONT); | |
1da177e4 LT |
551 | break; |
552 | case Opt_nouid32: | |
08851957 | 553 | set_opt (opts->s_mount_opt, NO_UID32); |
1da177e4 | 554 | break; |
1da177e4 | 555 | case Opt_nocheck: |
27e6ed54 CX |
556 | ext2_msg(sb, KERN_WARNING, |
557 | "Option nocheck/check=none is deprecated and" | |
558 | " will be removed in June 2020."); | |
08851957 | 559 | clear_opt (opts->s_mount_opt, CHECK); |
1da177e4 LT |
560 | break; |
561 | case Opt_debug: | |
08851957 | 562 | set_opt (opts->s_mount_opt, DEBUG); |
1da177e4 LT |
563 | break; |
564 | case Opt_oldalloc: | |
08851957 | 565 | set_opt (opts->s_mount_opt, OLDALLOC); |
1da177e4 LT |
566 | break; |
567 | case Opt_orlov: | |
08851957 | 568 | clear_opt (opts->s_mount_opt, OLDALLOC); |
1da177e4 LT |
569 | break; |
570 | case Opt_nobh: | |
08851957 | 571 | set_opt (opts->s_mount_opt, NOBH); |
1da177e4 LT |
572 | break; |
573 | #ifdef CONFIG_EXT2_FS_XATTR | |
574 | case Opt_user_xattr: | |
08851957 | 575 | set_opt (opts->s_mount_opt, XATTR_USER); |
1da177e4 LT |
576 | break; |
577 | case Opt_nouser_xattr: | |
08851957 | 578 | clear_opt (opts->s_mount_opt, XATTR_USER); |
1da177e4 LT |
579 | break; |
580 | #else | |
581 | case Opt_user_xattr: | |
582 | case Opt_nouser_xattr: | |
2314b07c AF |
583 | ext2_msg(sb, KERN_INFO, "(no)user_xattr options" |
584 | "not supported"); | |
1da177e4 LT |
585 | break; |
586 | #endif | |
587 | #ifdef CONFIG_EXT2_FS_POSIX_ACL | |
588 | case Opt_acl: | |
08851957 | 589 | set_opt(opts->s_mount_opt, POSIX_ACL); |
1da177e4 LT |
590 | break; |
591 | case Opt_noacl: | |
08851957 | 592 | clear_opt(opts->s_mount_opt, POSIX_ACL); |
1da177e4 LT |
593 | break; |
594 | #else | |
595 | case Opt_acl: | |
596 | case Opt_noacl: | |
2314b07c AF |
597 | ext2_msg(sb, KERN_INFO, |
598 | "(no)acl options not supported"); | |
1da177e4 LT |
599 | break; |
600 | #endif | |
6d79125b | 601 | case Opt_xip: |
9c3ce9ec | 602 | ext2_msg(sb, KERN_INFO, "use dax instead of xip"); |
08851957 | 603 | set_opt(opts->s_mount_opt, XIP); |
9c3ce9ec MW |
604 | /* Fall through */ |
605 | case Opt_dax: | |
6cd176a5 | 606 | #ifdef CONFIG_FS_DAX |
ef83b6e8 DW |
607 | ext2_msg(sb, KERN_WARNING, |
608 | "DAX enabled. Warning: EXPERIMENTAL, use at your own risk"); | |
08851957 | 609 | set_opt(opts->s_mount_opt, DAX); |
6d79125b | 610 | #else |
9c3ce9ec | 611 | ext2_msg(sb, KERN_INFO, "dax option not supported"); |
6d79125b CO |
612 | #endif |
613 | break; | |
8fc2751b MB |
614 | |
615 | #if defined(CONFIG_QUOTA) | |
616 | case Opt_quota: | |
617 | case Opt_usrquota: | |
08851957 | 618 | set_opt(opts->s_mount_opt, USRQUOTA); |
8fc2751b MB |
619 | break; |
620 | ||
621 | case Opt_grpquota: | |
08851957 | 622 | set_opt(opts->s_mount_opt, GRPQUOTA); |
8fc2751b MB |
623 | break; |
624 | #else | |
625 | case Opt_quota: | |
626 | case Opt_usrquota: | |
627 | case Opt_grpquota: | |
2314b07c AF |
628 | ext2_msg(sb, KERN_INFO, |
629 | "quota operations not supported"); | |
8fc2751b MB |
630 | break; |
631 | #endif | |
632 | ||
a686cd89 | 633 | case Opt_reservation: |
08851957 | 634 | set_opt(opts->s_mount_opt, RESERVATION); |
2314b07c | 635 | ext2_msg(sb, KERN_INFO, "reservations ON"); |
a686cd89 MB |
636 | break; |
637 | case Opt_noreservation: | |
08851957 | 638 | clear_opt(opts->s_mount_opt, RESERVATION); |
2314b07c | 639 | ext2_msg(sb, KERN_INFO, "reservations OFF"); |
a686cd89 | 640 | break; |
1da177e4 LT |
641 | case Opt_ignore: |
642 | break; | |
643 | default: | |
644 | return 0; | |
645 | } | |
646 | } | |
1da177e4 LT |
647 | return 1; |
648 | } | |
649 | ||
650 | static int ext2_setup_super (struct super_block * sb, | |
651 | struct ext2_super_block * es, | |
652 | int read_only) | |
653 | { | |
654 | int res = 0; | |
655 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
656 | ||
657 | if (le32_to_cpu(es->s_rev_level) > EXT2_MAX_SUPP_REV) { | |
2314b07c AF |
658 | ext2_msg(sb, KERN_ERR, |
659 | "error: revision level too high, " | |
660 | "forcing read-only mode"); | |
1751e8a6 | 661 | res = SB_RDONLY; |
1da177e4 LT |
662 | } |
663 | if (read_only) | |
664 | return res; | |
665 | if (!(sbi->s_mount_state & EXT2_VALID_FS)) | |
2314b07c AF |
666 | ext2_msg(sb, KERN_WARNING, |
667 | "warning: mounting unchecked fs, " | |
668 | "running e2fsck is recommended"); | |
1da177e4 | 669 | else if ((sbi->s_mount_state & EXT2_ERROR_FS)) |
2314b07c AF |
670 | ext2_msg(sb, KERN_WARNING, |
671 | "warning: mounting fs with errors, " | |
672 | "running e2fsck is recommended"); | |
1da177e4 LT |
673 | else if ((__s16) le16_to_cpu(es->s_max_mnt_count) >= 0 && |
674 | le16_to_cpu(es->s_mnt_count) >= | |
675 | (unsigned short) (__s16) le16_to_cpu(es->s_max_mnt_count)) | |
2314b07c AF |
676 | ext2_msg(sb, KERN_WARNING, |
677 | "warning: maximal mount count reached, " | |
678 | "running e2fsck is recommended"); | |
1da177e4 | 679 | else if (le32_to_cpu(es->s_checkinterval) && |
2314b07c | 680 | (le32_to_cpu(es->s_lastcheck) + |
fe2c3254 AB |
681 | le32_to_cpu(es->s_checkinterval) <= |
682 | ktime_get_real_seconds())) | |
2314b07c AF |
683 | ext2_msg(sb, KERN_WARNING, |
684 | "warning: checktime reached, " | |
685 | "running e2fsck is recommended"); | |
1da177e4 LT |
686 | if (!le16_to_cpu(es->s_max_mnt_count)) |
687 | es->s_max_mnt_count = cpu_to_le16(EXT2_DFL_MAX_MNT_COUNT); | |
fba4d399 | 688 | le16_add_cpu(&es->s_mnt_count, 1); |
1da177e4 | 689 | if (test_opt (sb, DEBUG)) |
2314b07c AF |
690 | ext2_msg(sb, KERN_INFO, "%s, %s, bs=%lu, fs=%lu, gc=%lu, " |
691 | "bpg=%lu, ipg=%lu, mo=%04lx]", | |
1da177e4 LT |
692 | EXT2FS_VERSION, EXT2FS_DATE, sb->s_blocksize, |
693 | sbi->s_frag_size, | |
694 | sbi->s_groups_count, | |
695 | EXT2_BLOCKS_PER_GROUP(sb), | |
696 | EXT2_INODES_PER_GROUP(sb), | |
697 | sbi->s_mount_opt); | |
1da177e4 LT |
698 | return res; |
699 | } | |
700 | ||
197cd65a | 701 | static int ext2_check_descriptors(struct super_block *sb) |
1da177e4 LT |
702 | { |
703 | int i; | |
1da177e4 | 704 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
1da177e4 LT |
705 | |
706 | ext2_debug ("Checking group descriptors"); | |
707 | ||
197cd65a AM |
708 | for (i = 0; i < sbi->s_groups_count; i++) { |
709 | struct ext2_group_desc *gdp = ext2_get_group_desc(sb, i, NULL); | |
24097d12 AM |
710 | ext2_fsblk_t first_block = ext2_group_first_block_no(sb, i); |
711 | ext2_fsblk_t last_block; | |
197cd65a | 712 | |
41f04d85 ES |
713 | if (i == sbi->s_groups_count - 1) |
714 | last_block = le32_to_cpu(sbi->s_es->s_blocks_count) - 1; | |
715 | else | |
716 | last_block = first_block + | |
717 | (EXT2_BLOCKS_PER_GROUP(sb) - 1); | |
718 | ||
41f04d85 ES |
719 | if (le32_to_cpu(gdp->bg_block_bitmap) < first_block || |
720 | le32_to_cpu(gdp->bg_block_bitmap) > last_block) | |
1da177e4 LT |
721 | { |
722 | ext2_error (sb, "ext2_check_descriptors", | |
723 | "Block bitmap for group %d" | |
724 | " not in group (block %lu)!", | |
725 | i, (unsigned long) le32_to_cpu(gdp->bg_block_bitmap)); | |
726 | return 0; | |
727 | } | |
41f04d85 ES |
728 | if (le32_to_cpu(gdp->bg_inode_bitmap) < first_block || |
729 | le32_to_cpu(gdp->bg_inode_bitmap) > last_block) | |
1da177e4 LT |
730 | { |
731 | ext2_error (sb, "ext2_check_descriptors", | |
732 | "Inode bitmap for group %d" | |
733 | " not in group (block %lu)!", | |
734 | i, (unsigned long) le32_to_cpu(gdp->bg_inode_bitmap)); | |
735 | return 0; | |
736 | } | |
41f04d85 | 737 | if (le32_to_cpu(gdp->bg_inode_table) < first_block || |
780dcdb2 | 738 | le32_to_cpu(gdp->bg_inode_table) + sbi->s_itb_per_group - 1 > |
41f04d85 | 739 | last_block) |
1da177e4 LT |
740 | { |
741 | ext2_error (sb, "ext2_check_descriptors", | |
742 | "Inode table for group %d" | |
743 | " not in group (block %lu)!", | |
744 | i, (unsigned long) le32_to_cpu(gdp->bg_inode_table)); | |
745 | return 0; | |
746 | } | |
1da177e4 LT |
747 | } |
748 | return 1; | |
749 | } | |
750 | ||
1da177e4 LT |
751 | /* |
752 | * Maximal file size. There is a direct, and {,double-,triple-}indirect | |
753 | * block limit, and also a limit of (2^32 - 1) 512-byte sectors in i_blocks. | |
754 | * We need to be 1 filesystem block less than the 2^32 sector limit. | |
755 | */ | |
756 | static loff_t ext2_max_size(int bits) | |
757 | { | |
758 | loff_t res = EXT2_NDIR_BLOCKS; | |
902be4c5 | 759 | int meta_blocks; |
1c2d1421 JK |
760 | unsigned int upper_limit; |
761 | unsigned int ppb = 1 << (bits-2); | |
902be4c5 AK |
762 | |
763 | /* This is calculated to be the largest file size for a | |
764 | * dense, file such that the total number of | |
1da177e4 | 765 | * sectors in the file, including data and all indirect blocks, |
902be4c5 AK |
766 | * does not exceed 2^32 -1 |
767 | * __u32 i_blocks representing the total number of | |
768 | * 512 bytes blocks of the file | |
769 | */ | |
770 | upper_limit = (1LL << 32) - 1; | |
771 | ||
772 | /* total blocks in file system block size */ | |
773 | upper_limit >>= (bits - 9); | |
774 | ||
1c2d1421 JK |
775 | /* Compute how many blocks we can address by block tree */ |
776 | res += 1LL << (bits-2); | |
777 | res += 1LL << (2*(bits-2)); | |
778 | res += 1LL << (3*(bits-2)); | |
779 | /* Does block tree limit file size? */ | |
780 | if (res < upper_limit) | |
781 | goto check_lfs; | |
902be4c5 | 782 | |
1c2d1421 JK |
783 | res = upper_limit; |
784 | /* How many metadata blocks are needed for addressing upper_limit? */ | |
785 | upper_limit -= EXT2_NDIR_BLOCKS; | |
902be4c5 AK |
786 | /* indirect blocks */ |
787 | meta_blocks = 1; | |
1c2d1421 | 788 | upper_limit -= ppb; |
902be4c5 | 789 | /* double indirect blocks */ |
1c2d1421 JK |
790 | if (upper_limit < ppb * ppb) { |
791 | meta_blocks += 1 + DIV_ROUND_UP(upper_limit, ppb); | |
792 | res -= meta_blocks; | |
793 | goto check_lfs; | |
794 | } | |
795 | meta_blocks += 1 + ppb; | |
796 | upper_limit -= ppb * ppb; | |
797 | /* tripple indirect blocks for the rest */ | |
798 | meta_blocks += 1 + DIV_ROUND_UP(upper_limit, ppb) + | |
799 | DIV_ROUND_UP(upper_limit, ppb*ppb); | |
800 | res -= meta_blocks; | |
801 | check_lfs: | |
1da177e4 | 802 | res <<= bits; |
902be4c5 AK |
803 | if (res > MAX_LFS_FILESIZE) |
804 | res = MAX_LFS_FILESIZE; | |
805 | ||
1da177e4 LT |
806 | return res; |
807 | } | |
808 | ||
809 | static unsigned long descriptor_loc(struct super_block *sb, | |
810 | unsigned long logic_sb_block, | |
811 | int nr) | |
812 | { | |
813 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
24097d12 | 814 | unsigned long bg, first_meta_bg; |
1da177e4 LT |
815 | int has_super = 0; |
816 | ||
1da177e4 LT |
817 | first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); |
818 | ||
819 | if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) || | |
820 | nr < first_meta_bg) | |
821 | return (logic_sb_block + nr + 1); | |
822 | bg = sbi->s_desc_per_block * nr; | |
823 | if (ext2_bg_has_super(sb, bg)) | |
824 | has_super = 1; | |
24097d12 AM |
825 | |
826 | return ext2_group_first_block_no(sb, bg) + has_super; | |
1da177e4 LT |
827 | } |
828 | ||
829 | static int ext2_fill_super(struct super_block *sb, void *data, int silent) | |
830 | { | |
8cf037a8 | 831 | struct dax_device *dax_dev = fs_dax_get_by_bdev(sb->s_bdev); |
1da177e4 LT |
832 | struct buffer_head * bh; |
833 | struct ext2_sb_info * sbi; | |
834 | struct ext2_super_block * es; | |
835 | struct inode *root; | |
836 | unsigned long block; | |
837 | unsigned long sb_block = get_sb_block(&data); | |
838 | unsigned long logic_sb_block; | |
839 | unsigned long offset = 0; | |
840 | unsigned long def_mount_opts; | |
d0909905 | 841 | long ret = -ENOMEM; |
1da177e4 LT |
842 | int blocksize = BLOCK_SIZE; |
843 | int db_count; | |
844 | int i, j; | |
845 | __le32 features; | |
833f4077 | 846 | int err; |
08851957 | 847 | struct ext2_mount_options opts; |
1da177e4 | 848 | |
f8314dc6 | 849 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); |
1da177e4 | 850 | if (!sbi) |
e124a320 | 851 | goto failed; |
18a82eb9 PE |
852 | |
853 | sbi->s_blockgroup_lock = | |
854 | kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); | |
855 | if (!sbi->s_blockgroup_lock) { | |
856 | kfree(sbi); | |
e124a320 | 857 | goto failed; |
18a82eb9 | 858 | } |
1da177e4 | 859 | sb->s_fs_info = sbi; |
93d44cb2 | 860 | sbi->s_sb_block = sb_block; |
8cf037a8 | 861 | sbi->s_daxdev = dax_dev; |
1da177e4 | 862 | |
c15271f4 | 863 | spin_lock_init(&sbi->s_lock); |
d0909905 | 864 | ret = -EINVAL; |
c15271f4 | 865 | |
1da177e4 LT |
866 | /* |
867 | * See what the current blocksize for the device is, and | |
868 | * use that as the blocksize. Otherwise (or if the blocksize | |
869 | * is smaller than the default) use the default. | |
870 | * This is important for devices that have a hardware | |
871 | * sectorsize that is larger than the default. | |
872 | */ | |
873 | blocksize = sb_min_blocksize(sb, BLOCK_SIZE); | |
874 | if (!blocksize) { | |
2314b07c | 875 | ext2_msg(sb, KERN_ERR, "error: unable to set blocksize"); |
1da177e4 LT |
876 | goto failed_sbi; |
877 | } | |
878 | ||
879 | /* | |
880 | * If the superblock doesn't start on a hardware sector boundary, | |
881 | * calculate the offset. | |
882 | */ | |
883 | if (blocksize != BLOCK_SIZE) { | |
884 | logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; | |
885 | offset = (sb_block*BLOCK_SIZE) % blocksize; | |
886 | } else { | |
887 | logic_sb_block = sb_block; | |
888 | } | |
889 | ||
890 | if (!(bh = sb_bread(sb, logic_sb_block))) { | |
2314b07c | 891 | ext2_msg(sb, KERN_ERR, "error: unable to read superblock"); |
1da177e4 LT |
892 | goto failed_sbi; |
893 | } | |
894 | /* | |
895 | * Note: s_es must be initialized as soon as possible because | |
896 | * some ext2 macro-instructions depend on its value | |
897 | */ | |
898 | es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); | |
899 | sbi->s_es = es; | |
900 | sb->s_magic = le16_to_cpu(es->s_magic); | |
901 | ||
902 | if (sb->s_magic != EXT2_SUPER_MAGIC) | |
903 | goto cantfind_ext2; | |
904 | ||
e5f5b717 | 905 | opts.s_mount_opt = 0; |
1da177e4 LT |
906 | /* Set defaults before we parse the mount options */ |
907 | def_mount_opts = le32_to_cpu(es->s_default_mount_opts); | |
908 | if (def_mount_opts & EXT2_DEFM_DEBUG) | |
08851957 | 909 | set_opt(opts.s_mount_opt, DEBUG); |
1da177e4 | 910 | if (def_mount_opts & EXT2_DEFM_BSDGROUPS) |
08851957 | 911 | set_opt(opts.s_mount_opt, GRPID); |
1da177e4 | 912 | if (def_mount_opts & EXT2_DEFM_UID16) |
08851957 | 913 | set_opt(opts.s_mount_opt, NO_UID32); |
2e7842b8 | 914 | #ifdef CONFIG_EXT2_FS_XATTR |
1da177e4 | 915 | if (def_mount_opts & EXT2_DEFM_XATTR_USER) |
08851957 | 916 | set_opt(opts.s_mount_opt, XATTR_USER); |
2e7842b8 HD |
917 | #endif |
918 | #ifdef CONFIG_EXT2_FS_POSIX_ACL | |
1da177e4 | 919 | if (def_mount_opts & EXT2_DEFM_ACL) |
08851957 | 920 | set_opt(opts.s_mount_opt, POSIX_ACL); |
2e7842b8 | 921 | #endif |
1da177e4 LT |
922 | |
923 | if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC) | |
08851957 | 924 | set_opt(opts.s_mount_opt, ERRORS_PANIC); |
14e11e10 | 925 | else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE) |
08851957 | 926 | set_opt(opts.s_mount_opt, ERRORS_CONT); |
14e11e10 | 927 | else |
08851957 | 928 | set_opt(opts.s_mount_opt, ERRORS_RO); |
1da177e4 | 929 | |
08851957 JK |
930 | opts.s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid)); |
931 | opts.s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid)); | |
1da177e4 | 932 | |
08851957 | 933 | set_opt(opts.s_mount_opt, RESERVATION); |
a686cd89 | 934 | |
08851957 | 935 | if (!parse_options((char *) data, sb, &opts)) |
1da177e4 LT |
936 | goto failed_mount; |
937 | ||
08851957 JK |
938 | sbi->s_mount_opt = opts.s_mount_opt; |
939 | sbi->s_resuid = opts.s_resuid; | |
940 | sbi->s_resgid = opts.s_resgid; | |
941 | ||
1751e8a6 | 942 | sb->s_flags = (sb->s_flags & ~SB_POSIXACL) | |
1da177e4 | 943 | ((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? |
1751e8a6 | 944 | SB_POSIXACL : 0); |
46b15caa | 945 | sb->s_iflags |= SB_I_CGROUPWB; |
1da177e4 LT |
946 | |
947 | if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV && | |
948 | (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) || | |
949 | EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) || | |
950 | EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U))) | |
2314b07c AF |
951 | ext2_msg(sb, KERN_WARNING, |
952 | "warning: feature flags set on rev 0 fs, " | |
953 | "running e2fsck is recommended"); | |
1da177e4 LT |
954 | /* |
955 | * Check feature flags regardless of the revision level, since we | |
956 | * previously didn't change the revision level when setting the flags, | |
957 | * so there is a chance incompat flags are set on a rev 0 filesystem. | |
958 | */ | |
959 | features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP); | |
960 | if (features) { | |
2314b07c AF |
961 | ext2_msg(sb, KERN_ERR, "error: couldn't mount because of " |
962 | "unsupported optional features (%x)", | |
963 | le32_to_cpu(features)); | |
1da177e4 LT |
964 | goto failed_mount; |
965 | } | |
bc98a42c | 966 | if (!sb_rdonly(sb) && (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){ |
2314b07c AF |
967 | ext2_msg(sb, KERN_ERR, "error: couldn't mount RDWR because of " |
968 | "unsupported optional features (%x)", | |
969 | le32_to_cpu(features)); | |
1da177e4 LT |
970 | goto failed_mount; |
971 | } | |
972 | ||
973 | blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size); | |
974 | ||
9c3ce9ec | 975 | if (sbi->s_mount_opt & EXT2_MOUNT_DAX) { |
80660f20 | 976 | if (!bdev_dax_supported(sb->s_bdev, blocksize)) { |
b4b5798c DW |
977 | ext2_msg(sb, KERN_ERR, |
978 | "DAX unsupported by block device. Turning off DAX."); | |
979 | sbi->s_mount_opt &= ~EXT2_MOUNT_DAX; | |
980 | } | |
6d79125b CO |
981 | } |
982 | ||
1da177e4 LT |
983 | /* If the blocksize doesn't match, re-read the thing.. */ |
984 | if (sb->s_blocksize != blocksize) { | |
985 | brelse(bh); | |
986 | ||
987 | if (!sb_set_blocksize(sb, blocksize)) { | |
4e299c1d RD |
988 | ext2_msg(sb, KERN_ERR, |
989 | "error: bad blocksize %d", blocksize); | |
1da177e4 LT |
990 | goto failed_sbi; |
991 | } | |
992 | ||
993 | logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; | |
994 | offset = (sb_block*BLOCK_SIZE) % blocksize; | |
995 | bh = sb_bread(sb, logic_sb_block); | |
996 | if(!bh) { | |
2314b07c AF |
997 | ext2_msg(sb, KERN_ERR, "error: couldn't read" |
998 | "superblock on 2nd try"); | |
1da177e4 LT |
999 | goto failed_sbi; |
1000 | } | |
1001 | es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); | |
1002 | sbi->s_es = es; | |
1003 | if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) { | |
2314b07c | 1004 | ext2_msg(sb, KERN_ERR, "error: magic mismatch"); |
1da177e4 LT |
1005 | goto failed_mount; |
1006 | } | |
1007 | } | |
1008 | ||
1009 | sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits); | |
8de52778 | 1010 | sb->s_max_links = EXT2_LINK_MAX; |
1da177e4 LT |
1011 | |
1012 | if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) { | |
1013 | sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE; | |
1014 | sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO; | |
1015 | } else { | |
1016 | sbi->s_inode_size = le16_to_cpu(es->s_inode_size); | |
1017 | sbi->s_first_ino = le32_to_cpu(es->s_first_ino); | |
1018 | if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) || | |
d8ea6cf8 | 1019 | !is_power_of_2(sbi->s_inode_size) || |
1da177e4 | 1020 | (sbi->s_inode_size > blocksize)) { |
2314b07c AF |
1021 | ext2_msg(sb, KERN_ERR, |
1022 | "error: unsupported inode size: %d", | |
1da177e4 LT |
1023 | sbi->s_inode_size); |
1024 | goto failed_mount; | |
1025 | } | |
1026 | } | |
1027 | ||
1028 | sbi->s_frag_size = EXT2_MIN_FRAG_SIZE << | |
1029 | le32_to_cpu(es->s_log_frag_size); | |
1030 | if (sbi->s_frag_size == 0) | |
1031 | goto cantfind_ext2; | |
1032 | sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size; | |
1033 | ||
1034 | sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); | |
1035 | sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); | |
1036 | sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); | |
1037 | ||
1da177e4 | 1038 | sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb); |
607eb266 | 1039 | if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0) |
1da177e4 LT |
1040 | goto cantfind_ext2; |
1041 | sbi->s_itb_per_group = sbi->s_inodes_per_group / | |
1042 | sbi->s_inodes_per_block; | |
1043 | sbi->s_desc_per_block = sb->s_blocksize / | |
1044 | sizeof (struct ext2_group_desc); | |
1045 | sbi->s_sbh = bh; | |
1046 | sbi->s_mount_state = le16_to_cpu(es->s_state); | |
1047 | sbi->s_addr_per_block_bits = | |
f0d1b0b3 | 1048 | ilog2 (EXT2_ADDR_PER_BLOCK(sb)); |
1da177e4 | 1049 | sbi->s_desc_per_block_bits = |
f0d1b0b3 | 1050 | ilog2 (EXT2_DESC_PER_BLOCK(sb)); |
1da177e4 LT |
1051 | |
1052 | if (sb->s_magic != EXT2_SUPER_MAGIC) | |
1053 | goto cantfind_ext2; | |
1054 | ||
1055 | if (sb->s_blocksize != bh->b_size) { | |
1056 | if (!silent) | |
2314b07c | 1057 | ext2_msg(sb, KERN_ERR, "error: unsupported blocksize"); |
1da177e4 LT |
1058 | goto failed_mount; |
1059 | } | |
1060 | ||
1061 | if (sb->s_blocksize != sbi->s_frag_size) { | |
2314b07c AF |
1062 | ext2_msg(sb, KERN_ERR, |
1063 | "error: fragsize %lu != blocksize %lu" | |
1064 | "(not supported yet)", | |
1da177e4 LT |
1065 | sbi->s_frag_size, sb->s_blocksize); |
1066 | goto failed_mount; | |
1067 | } | |
1068 | ||
1069 | if (sbi->s_blocks_per_group > sb->s_blocksize * 8) { | |
2314b07c AF |
1070 | ext2_msg(sb, KERN_ERR, |
1071 | "error: #blocks per group too big: %lu", | |
1da177e4 LT |
1072 | sbi->s_blocks_per_group); |
1073 | goto failed_mount; | |
1074 | } | |
1075 | if (sbi->s_frags_per_group > sb->s_blocksize * 8) { | |
2314b07c AF |
1076 | ext2_msg(sb, KERN_ERR, |
1077 | "error: #fragments per group too big: %lu", | |
1da177e4 LT |
1078 | sbi->s_frags_per_group); |
1079 | goto failed_mount; | |
1080 | } | |
1081 | if (sbi->s_inodes_per_group > sb->s_blocksize * 8) { | |
2314b07c AF |
1082 | ext2_msg(sb, KERN_ERR, |
1083 | "error: #inodes per group too big: %lu", | |
1da177e4 LT |
1084 | sbi->s_inodes_per_group); |
1085 | goto failed_mount; | |
1086 | } | |
1087 | ||
1088 | if (EXT2_BLOCKS_PER_GROUP(sb) == 0) | |
1089 | goto cantfind_ext2; | |
41f04d85 ES |
1090 | sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) - |
1091 | le32_to_cpu(es->s_first_data_block) - 1) | |
1092 | / EXT2_BLOCKS_PER_GROUP(sb)) + 1; | |
1da177e4 LT |
1093 | db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) / |
1094 | EXT2_DESC_PER_BLOCK(sb); | |
6da2ec56 KC |
1095 | sbi->s_group_desc = kmalloc_array (db_count, |
1096 | sizeof(struct buffer_head *), | |
1097 | GFP_KERNEL); | |
1da177e4 | 1098 | if (sbi->s_group_desc == NULL) { |
6a03e6a8 | 1099 | ret = -ENOMEM; |
2314b07c | 1100 | ext2_msg(sb, KERN_ERR, "error: not enough memory"); |
1da177e4 LT |
1101 | goto failed_mount; |
1102 | } | |
18a82eb9 | 1103 | bgl_lock_init(sbi->s_blockgroup_lock); |
dd00cc48 | 1104 | sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL); |
1da177e4 | 1105 | if (!sbi->s_debts) { |
6a03e6a8 | 1106 | ret = -ENOMEM; |
2314b07c | 1107 | ext2_msg(sb, KERN_ERR, "error: not enough memory"); |
1da177e4 LT |
1108 | goto failed_mount_group_desc; |
1109 | } | |
1da177e4 LT |
1110 | for (i = 0; i < db_count; i++) { |
1111 | block = descriptor_loc(sb, logic_sb_block, i); | |
1112 | sbi->s_group_desc[i] = sb_bread(sb, block); | |
1113 | if (!sbi->s_group_desc[i]) { | |
1114 | for (j = 0; j < i; j++) | |
1115 | brelse (sbi->s_group_desc[j]); | |
2314b07c AF |
1116 | ext2_msg(sb, KERN_ERR, |
1117 | "error: unable to read group descriptors"); | |
1da177e4 LT |
1118 | goto failed_mount_group_desc; |
1119 | } | |
1120 | } | |
1121 | if (!ext2_check_descriptors (sb)) { | |
2314b07c | 1122 | ext2_msg(sb, KERN_ERR, "group descriptors corrupted"); |
1da177e4 LT |
1123 | goto failed_mount2; |
1124 | } | |
1125 | sbi->s_gdb_count = db_count; | |
1126 | get_random_bytes(&sbi->s_next_generation, sizeof(u32)); | |
1127 | spin_lock_init(&sbi->s_next_gen_lock); | |
0216bfcf | 1128 | |
a686cd89 MB |
1129 | /* per fileystem reservation list head & lock */ |
1130 | spin_lock_init(&sbi->s_rsv_window_lock); | |
1131 | sbi->s_rsv_window_root = RB_ROOT; | |
1132 | /* | |
1133 | * Add a single, static dummy reservation to the start of the | |
1134 | * reservation window list --- it gives us a placeholder for | |
1135 | * append-at-start-of-list which makes the allocation logic | |
1136 | * _much_ simpler. | |
1137 | */ | |
1138 | sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; | |
1139 | sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; | |
1140 | sbi->s_rsv_window_head.rsv_alloc_hit = 0; | |
1141 | sbi->s_rsv_window_head.rsv_goal_size = 0; | |
1142 | ext2_rsv_window_add(sb, &sbi->s_rsv_window_head); | |
1143 | ||
833f4077 | 1144 | err = percpu_counter_init(&sbi->s_freeblocks_counter, |
908c7f19 | 1145 | ext2_count_free_blocks(sb), GFP_KERNEL); |
833f4077 PZ |
1146 | if (!err) { |
1147 | err = percpu_counter_init(&sbi->s_freeinodes_counter, | |
908c7f19 | 1148 | ext2_count_free_inodes(sb), GFP_KERNEL); |
833f4077 PZ |
1149 | } |
1150 | if (!err) { | |
1151 | err = percpu_counter_init(&sbi->s_dirs_counter, | |
908c7f19 | 1152 | ext2_count_dirs(sb), GFP_KERNEL); |
833f4077 PZ |
1153 | } |
1154 | if (err) { | |
2314b07c | 1155 | ext2_msg(sb, KERN_ERR, "error: insufficient memory"); |
833f4077 PZ |
1156 | goto failed_mount3; |
1157 | } | |
be0726d3 JK |
1158 | |
1159 | #ifdef CONFIG_EXT2_FS_XATTR | |
47387409 TE |
1160 | sbi->s_ea_block_cache = ext2_xattr_create_cache(); |
1161 | if (!sbi->s_ea_block_cache) { | |
6a03e6a8 | 1162 | ret = -ENOMEM; |
47387409 | 1163 | ext2_msg(sb, KERN_ERR, "Failed to create ea_block_cache"); |
be0726d3 JK |
1164 | goto failed_mount3; |
1165 | } | |
1166 | #endif | |
1da177e4 LT |
1167 | /* |
1168 | * set up enough so that it can read an inode | |
1169 | */ | |
1170 | sb->s_op = &ext2_sops; | |
1171 | sb->s_export_op = &ext2_export_ops; | |
1172 | sb->s_xattr = ext2_xattr_handlers; | |
123e9caf CH |
1173 | |
1174 | #ifdef CONFIG_QUOTA | |
1175 | sb->dq_op = &dquot_operations; | |
161f3b74 | 1176 | sb->s_qcop = &ext2_quotactl_ops; |
64241118 | 1177 | sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; |
123e9caf CH |
1178 | #endif |
1179 | ||
52fcf703 DH |
1180 | root = ext2_iget(sb, EXT2_ROOT_INO); |
1181 | if (IS_ERR(root)) { | |
1182 | ret = PTR_ERR(root); | |
0216bfcf | 1183 | goto failed_mount3; |
1da177e4 LT |
1184 | } |
1185 | if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { | |
52fcf703 | 1186 | iput(root); |
2314b07c | 1187 | ext2_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck"); |
0216bfcf | 1188 | goto failed_mount3; |
1da177e4 | 1189 | } |
52fcf703 | 1190 | |
48fde701 | 1191 | sb->s_root = d_make_root(root); |
52fcf703 | 1192 | if (!sb->s_root) { |
2314b07c | 1193 | ext2_msg(sb, KERN_ERR, "error: get root inode failed"); |
52fcf703 DH |
1194 | ret = -ENOMEM; |
1195 | goto failed_mount3; | |
1196 | } | |
1da177e4 | 1197 | if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) |
2314b07c AF |
1198 | ext2_msg(sb, KERN_WARNING, |
1199 | "warning: mounting ext3 filesystem as ext2"); | |
bc98a42c | 1200 | if (ext2_setup_super (sb, es, sb_rdonly(sb))) |
1751e8a6 | 1201 | sb->s_flags |= SB_RDONLY; |
4c96a68b | 1202 | ext2_write_super(sb); |
1da177e4 LT |
1203 | return 0; |
1204 | ||
1205 | cantfind_ext2: | |
1206 | if (!silent) | |
2314b07c AF |
1207 | ext2_msg(sb, KERN_ERR, |
1208 | "error: can't find an ext2 filesystem on dev %s.", | |
1209 | sb->s_id); | |
1da177e4 | 1210 | goto failed_mount; |
0216bfcf | 1211 | failed_mount3: |
569ae920 | 1212 | ext2_xattr_destroy_cache(sbi->s_ea_block_cache); |
0216bfcf MC |
1213 | percpu_counter_destroy(&sbi->s_freeblocks_counter); |
1214 | percpu_counter_destroy(&sbi->s_freeinodes_counter); | |
1215 | percpu_counter_destroy(&sbi->s_dirs_counter); | |
1da177e4 LT |
1216 | failed_mount2: |
1217 | for (i = 0; i < db_count; i++) | |
1218 | brelse(sbi->s_group_desc[i]); | |
1219 | failed_mount_group_desc: | |
1220 | kfree(sbi->s_group_desc); | |
1221 | kfree(sbi->s_debts); | |
1222 | failed_mount: | |
1223 | brelse(bh); | |
1224 | failed_sbi: | |
1225 | sb->s_fs_info = NULL; | |
0f7ee7c1 | 1226 | kfree(sbi->s_blockgroup_lock); |
1da177e4 | 1227 | kfree(sbi); |
e124a320 | 1228 | failed: |
8cf037a8 | 1229 | fs_put_dax(dax_dev); |
52fcf703 | 1230 | return ret; |
1da177e4 LT |
1231 | } |
1232 | ||
7bf0dc9b TT |
1233 | static void ext2_clear_super_error(struct super_block *sb) |
1234 | { | |
1235 | struct buffer_head *sbh = EXT2_SB(sb)->s_sbh; | |
1236 | ||
1237 | if (buffer_write_io_error(sbh)) { | |
1238 | /* | |
1239 | * Oh, dear. A previous attempt to write the | |
1240 | * superblock failed. This could happen because the | |
1241 | * USB device was yanked out. Or it could happen to | |
1242 | * be a transient write error and maybe the block will | |
1243 | * be remapped. Nothing we can do but to retry the | |
1244 | * write and hope for the best. | |
1245 | */ | |
2b8120ef | 1246 | ext2_msg(sb, KERN_ERR, |
f463589a | 1247 | "previous I/O error to superblock detected"); |
7bf0dc9b TT |
1248 | clear_buffer_write_io_error(sbh); |
1249 | set_buffer_uptodate(sbh); | |
1250 | } | |
1251 | } | |
1252 | ||
65547661 JK |
1253 | void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es, |
1254 | int wait) | |
1da177e4 | 1255 | { |
7bf0dc9b | 1256 | ext2_clear_super_error(sb); |
c15271f4 | 1257 | spin_lock(&EXT2_SB(sb)->s_lock); |
1da177e4 LT |
1258 | es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb)); |
1259 | es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb)); | |
fe2c3254 | 1260 | es->s_wtime = cpu_to_le32(ktime_get_real_seconds()); |
c15271f4 JB |
1261 | /* unlock before we do IO */ |
1262 | spin_unlock(&EXT2_SB(sb)->s_lock); | |
1da177e4 | 1263 | mark_buffer_dirty(EXT2_SB(sb)->s_sbh); |
ee6921eb JB |
1264 | if (wait) |
1265 | sync_dirty_buffer(EXT2_SB(sb)->s_sbh); | |
1da177e4 LT |
1266 | } |
1267 | ||
1268 | /* | |
1269 | * In the second extended file system, it is not necessary to | |
1270 | * write the super block since we use a mapping of the | |
1271 | * disk super block in a buffer. | |
1272 | * | |
1273 | * However, this function is still used to set the fs valid | |
1274 | * flags to 0. We need to set this flag to 0 since the fs | |
1275 | * may have been checked while mounted and e2fsck may have | |
1276 | * set s_state to EXT2_VALID_FS after some corrections. | |
1277 | */ | |
40f31dd4 | 1278 | static int ext2_sync_fs(struct super_block *sb, int wait) |
1da177e4 | 1279 | { |
c15271f4 | 1280 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
40f31dd4 CH |
1281 | struct ext2_super_block *es = EXT2_SB(sb)->s_es; |
1282 | ||
a1177825 JK |
1283 | /* |
1284 | * Write quota structures to quota file, sync_blockdev() will write | |
1285 | * them to disk later | |
1286 | */ | |
1287 | dquot_writeback_dquots(sb, -1); | |
1288 | ||
c15271f4 | 1289 | spin_lock(&sbi->s_lock); |
40f31dd4 CH |
1290 | if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) { |
1291 | ext2_debug("setting valid to 0\n"); | |
1292 | es->s_state &= cpu_to_le16(~EXT2_VALID_FS); | |
1da177e4 | 1293 | } |
c15271f4 | 1294 | spin_unlock(&sbi->s_lock); |
ee6921eb | 1295 | ext2_sync_super(sb, es, wait); |
40f31dd4 CH |
1296 | return 0; |
1297 | } | |
1298 | ||
1e8b212f JK |
1299 | static int ext2_freeze(struct super_block *sb) |
1300 | { | |
1301 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
1302 | ||
1303 | /* | |
1304 | * Open but unlinked files present? Keep EXT2_VALID_FS flag cleared | |
1305 | * because we have unattached inodes and thus filesystem is not fully | |
1306 | * consistent. | |
1307 | */ | |
1308 | if (atomic_long_read(&sb->s_remove_count)) { | |
1309 | ext2_sync_fs(sb, 1); | |
1310 | return 0; | |
1311 | } | |
1312 | /* Set EXT2_FS_VALID flag */ | |
1313 | spin_lock(&sbi->s_lock); | |
1314 | sbi->s_es->s_state = cpu_to_le16(sbi->s_mount_state); | |
1315 | spin_unlock(&sbi->s_lock); | |
1316 | ext2_sync_super(sb, sbi->s_es, 1); | |
1317 | ||
1318 | return 0; | |
1319 | } | |
1320 | ||
1321 | static int ext2_unfreeze(struct super_block *sb) | |
1322 | { | |
1323 | /* Just write sb to clear EXT2_VALID_FS flag */ | |
1324 | ext2_write_super(sb); | |
1325 | ||
1326 | return 0; | |
1327 | } | |
40f31dd4 | 1328 | |
65547661 | 1329 | static void ext2_write_super(struct super_block *sb) |
40f31dd4 | 1330 | { |
bc98a42c | 1331 | if (!sb_rdonly(sb)) |
40f31dd4 | 1332 | ext2_sync_fs(sb, 1); |
1da177e4 LT |
1333 | } |
1334 | ||
1335 | static int ext2_remount (struct super_block * sb, int * flags, char * data) | |
1336 | { | |
1337 | struct ext2_sb_info * sbi = EXT2_SB(sb); | |
1338 | struct ext2_super_block * es; | |
08851957 | 1339 | struct ext2_mount_options new_opts; |
50a52234 JK |
1340 | int err; |
1341 | ||
02b9984d | 1342 | sync_filesystem(sb); |
337eb00a | 1343 | |
8af634ff | 1344 | spin_lock(&sbi->s_lock); |
08851957 JK |
1345 | new_opts.s_mount_opt = sbi->s_mount_opt; |
1346 | new_opts.s_resuid = sbi->s_resuid; | |
1347 | new_opts.s_resgid = sbi->s_resgid; | |
8af634ff | 1348 | spin_unlock(&sbi->s_lock); |
1da177e4 | 1349 | |
8af634ff | 1350 | if (!parse_options(data, sb, &new_opts)) |
08851957 | 1351 | return -EINVAL; |
1da177e4 | 1352 | |
8af634ff | 1353 | spin_lock(&sbi->s_lock); |
1da177e4 | 1354 | es = sbi->s_es; |
08851957 | 1355 | if ((sbi->s_mount_opt ^ new_opts.s_mount_opt) & EXT2_MOUNT_DAX) { |
2314b07c | 1356 | ext2_msg(sb, KERN_WARNING, "warning: refusing change of " |
9c3ce9ec | 1357 | "dax flag with busy inodes while remounting"); |
08851957 | 1358 | new_opts.s_mount_opt ^= EXT2_MOUNT_DAX; |
337eb00a | 1359 | } |
1751e8a6 | 1360 | if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb)) |
08851957 | 1361 | goto out_set; |
1751e8a6 | 1362 | if (*flags & SB_RDONLY) { |
1da177e4 | 1363 | if (le16_to_cpu(es->s_state) & EXT2_VALID_FS || |
08851957 JK |
1364 | !(sbi->s_mount_state & EXT2_VALID_FS)) |
1365 | goto out_set; | |
c79d967d | 1366 | |
1da177e4 LT |
1367 | /* |
1368 | * OK, we are remounting a valid rw partition rdonly, so set | |
1369 | * the rdonly flag and then mark the partition as valid again. | |
1370 | */ | |
1371 | es->s_state = cpu_to_le16(sbi->s_mount_state); | |
fe2c3254 | 1372 | es->s_mtime = cpu_to_le32(ktime_get_real_seconds()); |
c15271f4 | 1373 | spin_unlock(&sbi->s_lock); |
c79d967d | 1374 | |
0f0dd62f | 1375 | err = dquot_suspend(sb, -1); |
08851957 JK |
1376 | if (err < 0) |
1377 | return err; | |
c79d967d | 1378 | |
4c96a68b | 1379 | ext2_sync_super(sb, es, 1); |
1da177e4 LT |
1380 | } else { |
1381 | __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb, | |
1382 | ~EXT2_FEATURE_RO_COMPAT_SUPP); | |
1383 | if (ret) { | |
08851957 | 1384 | spin_unlock(&sbi->s_lock); |
2314b07c AF |
1385 | ext2_msg(sb, KERN_WARNING, |
1386 | "warning: couldn't remount RDWR because of " | |
1387 | "unsupported optional features (%x).", | |
1388 | le32_to_cpu(ret)); | |
08851957 | 1389 | return -EROFS; |
1da177e4 LT |
1390 | } |
1391 | /* | |
1392 | * Mounting a RDONLY partition read-write, so reread and | |
1393 | * store the current valid flag. (It may have been changed | |
1394 | * by e2fsck since we originally mounted the partition.) | |
1395 | */ | |
1396 | sbi->s_mount_state = le16_to_cpu(es->s_state); | |
1397 | if (!ext2_setup_super (sb, es, 0)) | |
1751e8a6 | 1398 | sb->s_flags &= ~SB_RDONLY; |
c15271f4 | 1399 | spin_unlock(&sbi->s_lock); |
c79d967d | 1400 | |
4c96a68b | 1401 | ext2_write_super(sb); |
c79d967d | 1402 | |
0f0dd62f | 1403 | dquot_resume(sb, -1); |
1da177e4 | 1404 | } |
c79d967d | 1405 | |
08851957 JK |
1406 | spin_lock(&sbi->s_lock); |
1407 | out_set: | |
1408 | sbi->s_mount_opt = new_opts.s_mount_opt; | |
1409 | sbi->s_resuid = new_opts.s_resuid; | |
1410 | sbi->s_resgid = new_opts.s_resgid; | |
1751e8a6 LT |
1411 | sb->s_flags = (sb->s_flags & ~SB_POSIXACL) | |
1412 | ((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? SB_POSIXACL : 0); | |
c15271f4 | 1413 | spin_unlock(&sbi->s_lock); |
08851957 JK |
1414 | |
1415 | return 0; | |
1da177e4 LT |
1416 | } |
1417 | ||
726c3342 | 1418 | static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf) |
1da177e4 | 1419 | { |
726c3342 | 1420 | struct super_block *sb = dentry->d_sb; |
1da177e4 | 1421 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
e4fca01e | 1422 | struct ext2_super_block *es = sbi->s_es; |
e4fca01e | 1423 | u64 fsid; |
1da177e4 | 1424 | |
c15271f4 JB |
1425 | spin_lock(&sbi->s_lock); |
1426 | ||
1da177e4 | 1427 | if (test_opt (sb, MINIX_DF)) |
2235219b BP |
1428 | sbi->s_overhead_last = 0; |
1429 | else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) { | |
1430 | unsigned long i, overhead = 0; | |
1431 | smp_rmb(); | |
1432 | ||
1da177e4 | 1433 | /* |
2235219b BP |
1434 | * Compute the overhead (FS structures). This is constant |
1435 | * for a given filesystem unless the number of block groups | |
1436 | * changes so we cache the previous value until it does. | |
1da177e4 LT |
1437 | */ |
1438 | ||
1439 | /* | |
1440 | * All of the blocks before first_data_block are | |
1441 | * overhead | |
1442 | */ | |
e4fca01e | 1443 | overhead = le32_to_cpu(es->s_first_data_block); |
1da177e4 LT |
1444 | |
1445 | /* | |
1446 | * Add the overhead attributed to the superblock and | |
1447 | * block group descriptors. If the sparse superblocks | |
1448 | * feature is turned on, then not all groups have this. | |
1449 | */ | |
1450 | for (i = 0; i < sbi->s_groups_count; i++) | |
1451 | overhead += ext2_bg_has_super(sb, i) + | |
1452 | ext2_bg_num_gdb(sb, i); | |
1453 | ||
1454 | /* | |
1455 | * Every block group has an inode bitmap, a block | |
1456 | * bitmap, and an inode table. | |
1457 | */ | |
1458 | overhead += (sbi->s_groups_count * | |
1459 | (2 + sbi->s_itb_per_group)); | |
2235219b BP |
1460 | sbi->s_overhead_last = overhead; |
1461 | smp_wmb(); | |
1462 | sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count); | |
1da177e4 LT |
1463 | } |
1464 | ||
1465 | buf->f_type = EXT2_SUPER_MAGIC; | |
1466 | buf->f_bsize = sb->s_blocksize; | |
2235219b | 1467 | buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last; |
1da177e4 | 1468 | buf->f_bfree = ext2_count_free_blocks(sb); |
2235219b | 1469 | es->s_free_blocks_count = cpu_to_le32(buf->f_bfree); |
e4fca01e PE |
1470 | buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count); |
1471 | if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count)) | |
1da177e4 | 1472 | buf->f_bavail = 0; |
e4fca01e PE |
1473 | buf->f_files = le32_to_cpu(es->s_inodes_count); |
1474 | buf->f_ffree = ext2_count_free_inodes(sb); | |
2235219b | 1475 | es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); |
1da177e4 | 1476 | buf->f_namelen = EXT2_NAME_LEN; |
e4fca01e PE |
1477 | fsid = le64_to_cpup((void *)es->s_uuid) ^ |
1478 | le64_to_cpup((void *)es->s_uuid + sizeof(u64)); | |
1479 | buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; | |
1480 | buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; | |
c15271f4 | 1481 | spin_unlock(&sbi->s_lock); |
1da177e4 LT |
1482 | return 0; |
1483 | } | |
1484 | ||
152a0836 AV |
1485 | static struct dentry *ext2_mount(struct file_system_type *fs_type, |
1486 | int flags, const char *dev_name, void *data) | |
1da177e4 | 1487 | { |
152a0836 | 1488 | return mount_bdev(fs_type, flags, dev_name, data, ext2_fill_super); |
1da177e4 LT |
1489 | } |
1490 | ||
1491 | #ifdef CONFIG_QUOTA | |
1492 | ||
1493 | /* Read data from quotafile - avoid pagecache and such because we cannot afford | |
1494 | * acquiring the locks... As quota files are never truncated and quota code | |
25985edc | 1495 | * itself serializes the operations (and no one else should touch the files) |
1da177e4 LT |
1496 | * we don't have to be afraid of races */ |
1497 | static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, | |
1498 | size_t len, loff_t off) | |
1499 | { | |
1500 | struct inode *inode = sb_dqopt(sb)->files[type]; | |
1501 | sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); | |
1502 | int err = 0; | |
1503 | int offset = off & (sb->s_blocksize - 1); | |
1504 | int tocopy; | |
1505 | size_t toread; | |
1506 | struct buffer_head tmp_bh; | |
1507 | struct buffer_head *bh; | |
1508 | loff_t i_size = i_size_read(inode); | |
1509 | ||
1510 | if (off > i_size) | |
1511 | return 0; | |
1512 | if (off+len > i_size) | |
1513 | len = i_size-off; | |
1514 | toread = len; | |
1515 | while (toread > 0) { | |
1516 | tocopy = sb->s_blocksize - offset < toread ? | |
1517 | sb->s_blocksize - offset : toread; | |
1518 | ||
1519 | tmp_bh.b_state = 0; | |
c16831b4 | 1520 | tmp_bh.b_size = sb->s_blocksize; |
1da177e4 | 1521 | err = ext2_get_block(inode, blk, &tmp_bh, 0); |
a686cd89 | 1522 | if (err < 0) |
1da177e4 LT |
1523 | return err; |
1524 | if (!buffer_mapped(&tmp_bh)) /* A hole? */ | |
1525 | memset(data, 0, tocopy); | |
1526 | else { | |
1527 | bh = sb_bread(sb, tmp_bh.b_blocknr); | |
1528 | if (!bh) | |
1529 | return -EIO; | |
1530 | memcpy(data, bh->b_data+offset, tocopy); | |
1531 | brelse(bh); | |
1532 | } | |
1533 | offset = 0; | |
1534 | toread -= tocopy; | |
1535 | data += tocopy; | |
1536 | blk++; | |
1537 | } | |
1538 | return len; | |
1539 | } | |
1540 | ||
1541 | /* Write to quotafile */ | |
1542 | static ssize_t ext2_quota_write(struct super_block *sb, int type, | |
1543 | const char *data, size_t len, loff_t off) | |
1544 | { | |
1545 | struct inode *inode = sb_dqopt(sb)->files[type]; | |
1546 | sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); | |
1547 | int err = 0; | |
1548 | int offset = off & (sb->s_blocksize - 1); | |
1549 | int tocopy; | |
1550 | size_t towrite = len; | |
1551 | struct buffer_head tmp_bh; | |
1552 | struct buffer_head *bh; | |
1553 | ||
1da177e4 LT |
1554 | while (towrite > 0) { |
1555 | tocopy = sb->s_blocksize - offset < towrite ? | |
1556 | sb->s_blocksize - offset : towrite; | |
1557 | ||
1558 | tmp_bh.b_state = 0; | |
df4e7ac0 | 1559 | tmp_bh.b_size = sb->s_blocksize; |
1da177e4 | 1560 | err = ext2_get_block(inode, blk, &tmp_bh, 1); |
a686cd89 | 1561 | if (err < 0) |
1da177e4 LT |
1562 | goto out; |
1563 | if (offset || tocopy != EXT2_BLOCK_SIZE(sb)) | |
1564 | bh = sb_bread(sb, tmp_bh.b_blocknr); | |
1565 | else | |
1566 | bh = sb_getblk(sb, tmp_bh.b_blocknr); | |
2b0542a4 | 1567 | if (unlikely(!bh)) { |
1da177e4 LT |
1568 | err = -EIO; |
1569 | goto out; | |
1570 | } | |
1571 | lock_buffer(bh); | |
1572 | memcpy(bh->b_data+offset, data, tocopy); | |
1573 | flush_dcache_page(bh->b_page); | |
1574 | set_buffer_uptodate(bh); | |
1575 | mark_buffer_dirty(bh); | |
1576 | unlock_buffer(bh); | |
1577 | brelse(bh); | |
1578 | offset = 0; | |
1579 | towrite -= tocopy; | |
1580 | data += tocopy; | |
1581 | blk++; | |
1582 | } | |
1583 | out: | |
e2a3fde7 | 1584 | if (len == towrite) |
1da177e4 LT |
1585 | return err; |
1586 | if (inode->i_size < off+len-towrite) | |
1587 | i_size_write(inode, off+len-towrite); | |
e1d747d9 | 1588 | inode_inc_iversion(inode); |
078cd827 | 1589 | inode->i_mtime = inode->i_ctime = current_time(inode); |
1da177e4 | 1590 | mark_inode_dirty(inode); |
1da177e4 LT |
1591 | return len - towrite; |
1592 | } | |
1593 | ||
161f3b74 JK |
1594 | static int ext2_quota_on(struct super_block *sb, int type, int format_id, |
1595 | const struct path *path) | |
1596 | { | |
1597 | int err; | |
1598 | struct inode *inode; | |
1599 | ||
1600 | err = dquot_quota_on(sb, type, format_id, path); | |
1601 | if (err) | |
1602 | return err; | |
1603 | ||
1604 | inode = d_inode(path->dentry); | |
1605 | inode_lock(inode); | |
1606 | EXT2_I(inode)->i_flags |= EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL; | |
1607 | inode_set_flags(inode, S_NOATIME | S_IMMUTABLE, | |
1608 | S_NOATIME | S_IMMUTABLE); | |
1609 | inode_unlock(inode); | |
1610 | mark_inode_dirty(inode); | |
1611 | ||
1612 | return 0; | |
1613 | } | |
1614 | ||
1615 | static int ext2_quota_off(struct super_block *sb, int type) | |
1616 | { | |
1617 | struct inode *inode = sb_dqopt(sb)->files[type]; | |
1618 | int err; | |
1619 | ||
1620 | if (!inode || !igrab(inode)) | |
1621 | goto out; | |
1622 | ||
1623 | err = dquot_quota_off(sb, type); | |
1624 | if (err) | |
1625 | goto out_put; | |
1626 | ||
1627 | inode_lock(inode); | |
1628 | EXT2_I(inode)->i_flags &= ~(EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL); | |
1629 | inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE); | |
1630 | inode_unlock(inode); | |
1631 | mark_inode_dirty(inode); | |
1632 | out_put: | |
1633 | iput(inode); | |
1634 | return err; | |
1635 | out: | |
1636 | return dquot_quota_off(sb, type); | |
1637 | } | |
1638 | ||
1da177e4 LT |
1639 | #endif |
1640 | ||
1641 | static struct file_system_type ext2_fs_type = { | |
1642 | .owner = THIS_MODULE, | |
1643 | .name = "ext2", | |
152a0836 | 1644 | .mount = ext2_mount, |
1da177e4 | 1645 | .kill_sb = kill_block_super, |
46b15caa | 1646 | .fs_flags = FS_REQUIRES_DEV, |
1da177e4 | 1647 | }; |
7f78e035 | 1648 | MODULE_ALIAS_FS("ext2"); |
1da177e4 LT |
1649 | |
1650 | static int __init init_ext2_fs(void) | |
1651 | { | |
be0726d3 JK |
1652 | int err; |
1653 | ||
1da177e4 LT |
1654 | err = init_inodecache(); |
1655 | if (err) | |
be0726d3 | 1656 | return err; |
1da177e4 LT |
1657 | err = register_filesystem(&ext2_fs_type); |
1658 | if (err) | |
1659 | goto out; | |
1660 | return 0; | |
1661 | out: | |
1662 | destroy_inodecache(); | |
1da177e4 LT |
1663 | return err; |
1664 | } | |
1665 | ||
1666 | static void __exit exit_ext2_fs(void) | |
1667 | { | |
1668 | unregister_filesystem(&ext2_fs_type); | |
1669 | destroy_inodecache(); | |
1da177e4 LT |
1670 | } |
1671 | ||
302bf2f3 PG |
1672 | MODULE_AUTHOR("Remy Card and others"); |
1673 | MODULE_DESCRIPTION("Second Extended Filesystem"); | |
1674 | MODULE_LICENSE("GPL"); | |
1da177e4 LT |
1675 | module_init(init_ext2_fs) |
1676 | module_exit(exit_ext2_fs) |