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Commit | Line | Data |
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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 OR |
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 OR |
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 OR |
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 OR |
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 OR |
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 OR |
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 OR |
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 OR |
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 OR |
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 OR |
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 OR |
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 OR |
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 AK |
759 | int meta_blocks; |
760 | loff_t upper_limit; | |
761 | ||
762 | /* This is calculated to be the largest file size for a | |
763 | * dense, file such that the total number of | |
1da177e4 | 764 | * sectors in the file, including data and all indirect blocks, |
902be4c5 AK |
765 | * does not exceed 2^32 -1 |
766 | * __u32 i_blocks representing the total number of | |
767 | * 512 bytes blocks of the file | |
768 | */ | |
769 | upper_limit = (1LL << 32) - 1; | |
770 | ||
771 | /* total blocks in file system block size */ | |
772 | upper_limit >>= (bits - 9); | |
773 | ||
774 | ||
775 | /* indirect blocks */ | |
776 | meta_blocks = 1; | |
777 | /* double indirect blocks */ | |
778 | meta_blocks += 1 + (1LL << (bits-2)); | |
779 | /* tripple indirect blocks */ | |
780 | meta_blocks += 1 + (1LL << (bits-2)) + (1LL << (2*(bits-2))); | |
781 | ||
782 | upper_limit -= meta_blocks; | |
783 | upper_limit <<= bits; | |
1da177e4 LT |
784 | |
785 | res += 1LL << (bits-2); | |
786 | res += 1LL << (2*(bits-2)); | |
787 | res += 1LL << (3*(bits-2)); | |
788 | res <<= bits; | |
789 | if (res > upper_limit) | |
790 | res = upper_limit; | |
902be4c5 AK |
791 | |
792 | if (res > MAX_LFS_FILESIZE) | |
793 | res = MAX_LFS_FILESIZE; | |
794 | ||
1da177e4 LT |
795 | return res; |
796 | } | |
797 | ||
798 | static unsigned long descriptor_loc(struct super_block *sb, | |
799 | unsigned long logic_sb_block, | |
800 | int nr) | |
801 | { | |
802 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
24097d12 | 803 | unsigned long bg, first_meta_bg; |
1da177e4 LT |
804 | int has_super = 0; |
805 | ||
1da177e4 LT |
806 | first_meta_bg = le32_to_cpu(sbi->s_es->s_first_meta_bg); |
807 | ||
808 | if (!EXT2_HAS_INCOMPAT_FEATURE(sb, EXT2_FEATURE_INCOMPAT_META_BG) || | |
809 | nr < first_meta_bg) | |
810 | return (logic_sb_block + nr + 1); | |
811 | bg = sbi->s_desc_per_block * nr; | |
812 | if (ext2_bg_has_super(sb, bg)) | |
813 | has_super = 1; | |
24097d12 AM |
814 | |
815 | return ext2_group_first_block_no(sb, bg) + has_super; | |
1da177e4 LT |
816 | } |
817 | ||
818 | static int ext2_fill_super(struct super_block *sb, void *data, int silent) | |
819 | { | |
8cf037a8 | 820 | struct dax_device *dax_dev = fs_dax_get_by_bdev(sb->s_bdev); |
1da177e4 LT |
821 | struct buffer_head * bh; |
822 | struct ext2_sb_info * sbi; | |
823 | struct ext2_super_block * es; | |
824 | struct inode *root; | |
825 | unsigned long block; | |
826 | unsigned long sb_block = get_sb_block(&data); | |
827 | unsigned long logic_sb_block; | |
828 | unsigned long offset = 0; | |
829 | unsigned long def_mount_opts; | |
d0909905 | 830 | long ret = -ENOMEM; |
1da177e4 LT |
831 | int blocksize = BLOCK_SIZE; |
832 | int db_count; | |
833 | int i, j; | |
834 | __le32 features; | |
833f4077 | 835 | int err; |
08851957 | 836 | struct ext2_mount_options opts; |
1da177e4 | 837 | |
f8314dc6 | 838 | sbi = kzalloc(sizeof(*sbi), GFP_KERNEL); |
1da177e4 | 839 | if (!sbi) |
e124a320 | 840 | goto failed; |
18a82eb9 PE |
841 | |
842 | sbi->s_blockgroup_lock = | |
843 | kzalloc(sizeof(struct blockgroup_lock), GFP_KERNEL); | |
844 | if (!sbi->s_blockgroup_lock) { | |
845 | kfree(sbi); | |
e124a320 | 846 | goto failed; |
18a82eb9 | 847 | } |
1da177e4 | 848 | sb->s_fs_info = sbi; |
93d44cb2 | 849 | sbi->s_sb_block = sb_block; |
8cf037a8 | 850 | sbi->s_daxdev = dax_dev; |
1da177e4 | 851 | |
c15271f4 | 852 | spin_lock_init(&sbi->s_lock); |
d0909905 | 853 | ret = -EINVAL; |
c15271f4 | 854 | |
1da177e4 LT |
855 | /* |
856 | * See what the current blocksize for the device is, and | |
857 | * use that as the blocksize. Otherwise (or if the blocksize | |
858 | * is smaller than the default) use the default. | |
859 | * This is important for devices that have a hardware | |
860 | * sectorsize that is larger than the default. | |
861 | */ | |
862 | blocksize = sb_min_blocksize(sb, BLOCK_SIZE); | |
863 | if (!blocksize) { | |
2314b07c | 864 | ext2_msg(sb, KERN_ERR, "error: unable to set blocksize"); |
1da177e4 LT |
865 | goto failed_sbi; |
866 | } | |
867 | ||
868 | /* | |
869 | * If the superblock doesn't start on a hardware sector boundary, | |
870 | * calculate the offset. | |
871 | */ | |
872 | if (blocksize != BLOCK_SIZE) { | |
873 | logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; | |
874 | offset = (sb_block*BLOCK_SIZE) % blocksize; | |
875 | } else { | |
876 | logic_sb_block = sb_block; | |
877 | } | |
878 | ||
879 | if (!(bh = sb_bread(sb, logic_sb_block))) { | |
2314b07c | 880 | ext2_msg(sb, KERN_ERR, "error: unable to read superblock"); |
1da177e4 LT |
881 | goto failed_sbi; |
882 | } | |
883 | /* | |
884 | * Note: s_es must be initialized as soon as possible because | |
885 | * some ext2 macro-instructions depend on its value | |
886 | */ | |
887 | es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); | |
888 | sbi->s_es = es; | |
889 | sb->s_magic = le16_to_cpu(es->s_magic); | |
890 | ||
891 | if (sb->s_magic != EXT2_SUPER_MAGIC) | |
892 | goto cantfind_ext2; | |
893 | ||
e5f5b717 | 894 | opts.s_mount_opt = 0; |
1da177e4 LT |
895 | /* Set defaults before we parse the mount options */ |
896 | def_mount_opts = le32_to_cpu(es->s_default_mount_opts); | |
897 | if (def_mount_opts & EXT2_DEFM_DEBUG) | |
08851957 | 898 | set_opt(opts.s_mount_opt, DEBUG); |
1da177e4 | 899 | if (def_mount_opts & EXT2_DEFM_BSDGROUPS) |
08851957 | 900 | set_opt(opts.s_mount_opt, GRPID); |
1da177e4 | 901 | if (def_mount_opts & EXT2_DEFM_UID16) |
08851957 | 902 | set_opt(opts.s_mount_opt, NO_UID32); |
2e7842b8 | 903 | #ifdef CONFIG_EXT2_FS_XATTR |
1da177e4 | 904 | if (def_mount_opts & EXT2_DEFM_XATTR_USER) |
08851957 | 905 | set_opt(opts.s_mount_opt, XATTR_USER); |
2e7842b8 HD |
906 | #endif |
907 | #ifdef CONFIG_EXT2_FS_POSIX_ACL | |
1da177e4 | 908 | if (def_mount_opts & EXT2_DEFM_ACL) |
08851957 | 909 | set_opt(opts.s_mount_opt, POSIX_ACL); |
2e7842b8 | 910 | #endif |
1da177e4 LT |
911 | |
912 | if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_PANIC) | |
08851957 | 913 | set_opt(opts.s_mount_opt, ERRORS_PANIC); |
14e11e10 | 914 | else if (le16_to_cpu(sbi->s_es->s_errors) == EXT2_ERRORS_CONTINUE) |
08851957 | 915 | set_opt(opts.s_mount_opt, ERRORS_CONT); |
14e11e10 | 916 | else |
08851957 | 917 | set_opt(opts.s_mount_opt, ERRORS_RO); |
1da177e4 | 918 | |
08851957 JK |
919 | opts.s_resuid = make_kuid(&init_user_ns, le16_to_cpu(es->s_def_resuid)); |
920 | opts.s_resgid = make_kgid(&init_user_ns, le16_to_cpu(es->s_def_resgid)); | |
1da177e4 | 921 | |
08851957 | 922 | set_opt(opts.s_mount_opt, RESERVATION); |
a686cd89 | 923 | |
08851957 | 924 | if (!parse_options((char *) data, sb, &opts)) |
1da177e4 LT |
925 | goto failed_mount; |
926 | ||
08851957 JK |
927 | sbi->s_mount_opt = opts.s_mount_opt; |
928 | sbi->s_resuid = opts.s_resuid; | |
929 | sbi->s_resgid = opts.s_resgid; | |
930 | ||
1751e8a6 | 931 | sb->s_flags = (sb->s_flags & ~SB_POSIXACL) | |
1da177e4 | 932 | ((EXT2_SB(sb)->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? |
1751e8a6 | 933 | SB_POSIXACL : 0); |
46b15caa | 934 | sb->s_iflags |= SB_I_CGROUPWB; |
1da177e4 LT |
935 | |
936 | if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV && | |
937 | (EXT2_HAS_COMPAT_FEATURE(sb, ~0U) || | |
938 | EXT2_HAS_RO_COMPAT_FEATURE(sb, ~0U) || | |
939 | EXT2_HAS_INCOMPAT_FEATURE(sb, ~0U))) | |
2314b07c OR |
940 | ext2_msg(sb, KERN_WARNING, |
941 | "warning: feature flags set on rev 0 fs, " | |
942 | "running e2fsck is recommended"); | |
1da177e4 LT |
943 | /* |
944 | * Check feature flags regardless of the revision level, since we | |
945 | * previously didn't change the revision level when setting the flags, | |
946 | * so there is a chance incompat flags are set on a rev 0 filesystem. | |
947 | */ | |
948 | features = EXT2_HAS_INCOMPAT_FEATURE(sb, ~EXT2_FEATURE_INCOMPAT_SUPP); | |
949 | if (features) { | |
2314b07c OR |
950 | ext2_msg(sb, KERN_ERR, "error: couldn't mount because of " |
951 | "unsupported optional features (%x)", | |
952 | le32_to_cpu(features)); | |
1da177e4 LT |
953 | goto failed_mount; |
954 | } | |
bc98a42c | 955 | if (!sb_rdonly(sb) && (features = EXT2_HAS_RO_COMPAT_FEATURE(sb, ~EXT2_FEATURE_RO_COMPAT_SUPP))){ |
2314b07c OR |
956 | ext2_msg(sb, KERN_ERR, "error: couldn't mount RDWR because of " |
957 | "unsupported optional features (%x)", | |
958 | le32_to_cpu(features)); | |
1da177e4 LT |
959 | goto failed_mount; |
960 | } | |
961 | ||
962 | blocksize = BLOCK_SIZE << le32_to_cpu(sbi->s_es->s_log_block_size); | |
963 | ||
9c3ce9ec | 964 | if (sbi->s_mount_opt & EXT2_MOUNT_DAX) { |
80660f20 | 965 | if (!bdev_dax_supported(sb->s_bdev, blocksize)) { |
b4b5798c DW |
966 | ext2_msg(sb, KERN_ERR, |
967 | "DAX unsupported by block device. Turning off DAX."); | |
968 | sbi->s_mount_opt &= ~EXT2_MOUNT_DAX; | |
969 | } | |
6d79125b CO |
970 | } |
971 | ||
1da177e4 LT |
972 | /* If the blocksize doesn't match, re-read the thing.. */ |
973 | if (sb->s_blocksize != blocksize) { | |
974 | brelse(bh); | |
975 | ||
976 | if (!sb_set_blocksize(sb, blocksize)) { | |
4e299c1d RD |
977 | ext2_msg(sb, KERN_ERR, |
978 | "error: bad blocksize %d", blocksize); | |
1da177e4 LT |
979 | goto failed_sbi; |
980 | } | |
981 | ||
982 | logic_sb_block = (sb_block*BLOCK_SIZE) / blocksize; | |
983 | offset = (sb_block*BLOCK_SIZE) % blocksize; | |
984 | bh = sb_bread(sb, logic_sb_block); | |
985 | if(!bh) { | |
2314b07c OR |
986 | ext2_msg(sb, KERN_ERR, "error: couldn't read" |
987 | "superblock on 2nd try"); | |
1da177e4 LT |
988 | goto failed_sbi; |
989 | } | |
990 | es = (struct ext2_super_block *) (((char *)bh->b_data) + offset); | |
991 | sbi->s_es = es; | |
992 | if (es->s_magic != cpu_to_le16(EXT2_SUPER_MAGIC)) { | |
2314b07c | 993 | ext2_msg(sb, KERN_ERR, "error: magic mismatch"); |
1da177e4 LT |
994 | goto failed_mount; |
995 | } | |
996 | } | |
997 | ||
998 | sb->s_maxbytes = ext2_max_size(sb->s_blocksize_bits); | |
8de52778 | 999 | sb->s_max_links = EXT2_LINK_MAX; |
1da177e4 LT |
1000 | |
1001 | if (le32_to_cpu(es->s_rev_level) == EXT2_GOOD_OLD_REV) { | |
1002 | sbi->s_inode_size = EXT2_GOOD_OLD_INODE_SIZE; | |
1003 | sbi->s_first_ino = EXT2_GOOD_OLD_FIRST_INO; | |
1004 | } else { | |
1005 | sbi->s_inode_size = le16_to_cpu(es->s_inode_size); | |
1006 | sbi->s_first_ino = le32_to_cpu(es->s_first_ino); | |
1007 | if ((sbi->s_inode_size < EXT2_GOOD_OLD_INODE_SIZE) || | |
d8ea6cf8 | 1008 | !is_power_of_2(sbi->s_inode_size) || |
1da177e4 | 1009 | (sbi->s_inode_size > blocksize)) { |
2314b07c OR |
1010 | ext2_msg(sb, KERN_ERR, |
1011 | "error: unsupported inode size: %d", | |
1da177e4 LT |
1012 | sbi->s_inode_size); |
1013 | goto failed_mount; | |
1014 | } | |
1015 | } | |
1016 | ||
1017 | sbi->s_frag_size = EXT2_MIN_FRAG_SIZE << | |
1018 | le32_to_cpu(es->s_log_frag_size); | |
1019 | if (sbi->s_frag_size == 0) | |
1020 | goto cantfind_ext2; | |
1021 | sbi->s_frags_per_block = sb->s_blocksize / sbi->s_frag_size; | |
1022 | ||
1023 | sbi->s_blocks_per_group = le32_to_cpu(es->s_blocks_per_group); | |
1024 | sbi->s_frags_per_group = le32_to_cpu(es->s_frags_per_group); | |
1025 | sbi->s_inodes_per_group = le32_to_cpu(es->s_inodes_per_group); | |
1026 | ||
1027 | if (EXT2_INODE_SIZE(sb) == 0) | |
1028 | goto cantfind_ext2; | |
1029 | sbi->s_inodes_per_block = sb->s_blocksize / EXT2_INODE_SIZE(sb); | |
607eb266 | 1030 | if (sbi->s_inodes_per_block == 0 || sbi->s_inodes_per_group == 0) |
1da177e4 LT |
1031 | goto cantfind_ext2; |
1032 | sbi->s_itb_per_group = sbi->s_inodes_per_group / | |
1033 | sbi->s_inodes_per_block; | |
1034 | sbi->s_desc_per_block = sb->s_blocksize / | |
1035 | sizeof (struct ext2_group_desc); | |
1036 | sbi->s_sbh = bh; | |
1037 | sbi->s_mount_state = le16_to_cpu(es->s_state); | |
1038 | sbi->s_addr_per_block_bits = | |
f0d1b0b3 | 1039 | ilog2 (EXT2_ADDR_PER_BLOCK(sb)); |
1da177e4 | 1040 | sbi->s_desc_per_block_bits = |
f0d1b0b3 | 1041 | ilog2 (EXT2_DESC_PER_BLOCK(sb)); |
1da177e4 LT |
1042 | |
1043 | if (sb->s_magic != EXT2_SUPER_MAGIC) | |
1044 | goto cantfind_ext2; | |
1045 | ||
1046 | if (sb->s_blocksize != bh->b_size) { | |
1047 | if (!silent) | |
2314b07c | 1048 | ext2_msg(sb, KERN_ERR, "error: unsupported blocksize"); |
1da177e4 LT |
1049 | goto failed_mount; |
1050 | } | |
1051 | ||
1052 | if (sb->s_blocksize != sbi->s_frag_size) { | |
2314b07c OR |
1053 | ext2_msg(sb, KERN_ERR, |
1054 | "error: fragsize %lu != blocksize %lu" | |
1055 | "(not supported yet)", | |
1da177e4 LT |
1056 | sbi->s_frag_size, sb->s_blocksize); |
1057 | goto failed_mount; | |
1058 | } | |
1059 | ||
1060 | if (sbi->s_blocks_per_group > sb->s_blocksize * 8) { | |
2314b07c OR |
1061 | ext2_msg(sb, KERN_ERR, |
1062 | "error: #blocks per group too big: %lu", | |
1da177e4 LT |
1063 | sbi->s_blocks_per_group); |
1064 | goto failed_mount; | |
1065 | } | |
1066 | if (sbi->s_frags_per_group > sb->s_blocksize * 8) { | |
2314b07c OR |
1067 | ext2_msg(sb, KERN_ERR, |
1068 | "error: #fragments per group too big: %lu", | |
1da177e4 LT |
1069 | sbi->s_frags_per_group); |
1070 | goto failed_mount; | |
1071 | } | |
1072 | if (sbi->s_inodes_per_group > sb->s_blocksize * 8) { | |
2314b07c OR |
1073 | ext2_msg(sb, KERN_ERR, |
1074 | "error: #inodes per group too big: %lu", | |
1da177e4 LT |
1075 | sbi->s_inodes_per_group); |
1076 | goto failed_mount; | |
1077 | } | |
1078 | ||
1079 | if (EXT2_BLOCKS_PER_GROUP(sb) == 0) | |
1080 | goto cantfind_ext2; | |
41f04d85 ES |
1081 | sbi->s_groups_count = ((le32_to_cpu(es->s_blocks_count) - |
1082 | le32_to_cpu(es->s_first_data_block) - 1) | |
1083 | / EXT2_BLOCKS_PER_GROUP(sb)) + 1; | |
1da177e4 LT |
1084 | db_count = (sbi->s_groups_count + EXT2_DESC_PER_BLOCK(sb) - 1) / |
1085 | EXT2_DESC_PER_BLOCK(sb); | |
6da2ec56 KC |
1086 | sbi->s_group_desc = kmalloc_array (db_count, |
1087 | sizeof(struct buffer_head *), | |
1088 | GFP_KERNEL); | |
1da177e4 | 1089 | if (sbi->s_group_desc == NULL) { |
2314b07c | 1090 | ext2_msg(sb, KERN_ERR, "error: not enough memory"); |
1da177e4 LT |
1091 | goto failed_mount; |
1092 | } | |
18a82eb9 | 1093 | bgl_lock_init(sbi->s_blockgroup_lock); |
dd00cc48 | 1094 | sbi->s_debts = kcalloc(sbi->s_groups_count, sizeof(*sbi->s_debts), GFP_KERNEL); |
1da177e4 | 1095 | if (!sbi->s_debts) { |
2314b07c | 1096 | ext2_msg(sb, KERN_ERR, "error: not enough memory"); |
1da177e4 LT |
1097 | goto failed_mount_group_desc; |
1098 | } | |
1da177e4 LT |
1099 | for (i = 0; i < db_count; i++) { |
1100 | block = descriptor_loc(sb, logic_sb_block, i); | |
1101 | sbi->s_group_desc[i] = sb_bread(sb, block); | |
1102 | if (!sbi->s_group_desc[i]) { | |
1103 | for (j = 0; j < i; j++) | |
1104 | brelse (sbi->s_group_desc[j]); | |
2314b07c OR |
1105 | ext2_msg(sb, KERN_ERR, |
1106 | "error: unable to read group descriptors"); | |
1da177e4 LT |
1107 | goto failed_mount_group_desc; |
1108 | } | |
1109 | } | |
1110 | if (!ext2_check_descriptors (sb)) { | |
2314b07c | 1111 | ext2_msg(sb, KERN_ERR, "group descriptors corrupted"); |
1da177e4 LT |
1112 | goto failed_mount2; |
1113 | } | |
1114 | sbi->s_gdb_count = db_count; | |
1115 | get_random_bytes(&sbi->s_next_generation, sizeof(u32)); | |
1116 | spin_lock_init(&sbi->s_next_gen_lock); | |
0216bfcf | 1117 | |
a686cd89 MB |
1118 | /* per fileystem reservation list head & lock */ |
1119 | spin_lock_init(&sbi->s_rsv_window_lock); | |
1120 | sbi->s_rsv_window_root = RB_ROOT; | |
1121 | /* | |
1122 | * Add a single, static dummy reservation to the start of the | |
1123 | * reservation window list --- it gives us a placeholder for | |
1124 | * append-at-start-of-list which makes the allocation logic | |
1125 | * _much_ simpler. | |
1126 | */ | |
1127 | sbi->s_rsv_window_head.rsv_start = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; | |
1128 | sbi->s_rsv_window_head.rsv_end = EXT2_RESERVE_WINDOW_NOT_ALLOCATED; | |
1129 | sbi->s_rsv_window_head.rsv_alloc_hit = 0; | |
1130 | sbi->s_rsv_window_head.rsv_goal_size = 0; | |
1131 | ext2_rsv_window_add(sb, &sbi->s_rsv_window_head); | |
1132 | ||
833f4077 | 1133 | err = percpu_counter_init(&sbi->s_freeblocks_counter, |
908c7f19 | 1134 | ext2_count_free_blocks(sb), GFP_KERNEL); |
833f4077 PZ |
1135 | if (!err) { |
1136 | err = percpu_counter_init(&sbi->s_freeinodes_counter, | |
908c7f19 | 1137 | ext2_count_free_inodes(sb), GFP_KERNEL); |
833f4077 PZ |
1138 | } |
1139 | if (!err) { | |
1140 | err = percpu_counter_init(&sbi->s_dirs_counter, | |
908c7f19 | 1141 | ext2_count_dirs(sb), GFP_KERNEL); |
833f4077 PZ |
1142 | } |
1143 | if (err) { | |
2314b07c | 1144 | ext2_msg(sb, KERN_ERR, "error: insufficient memory"); |
833f4077 PZ |
1145 | goto failed_mount3; |
1146 | } | |
be0726d3 JK |
1147 | |
1148 | #ifdef CONFIG_EXT2_FS_XATTR | |
47387409 TE |
1149 | sbi->s_ea_block_cache = ext2_xattr_create_cache(); |
1150 | if (!sbi->s_ea_block_cache) { | |
1151 | ext2_msg(sb, KERN_ERR, "Failed to create ea_block_cache"); | |
be0726d3 JK |
1152 | goto failed_mount3; |
1153 | } | |
1154 | #endif | |
1da177e4 LT |
1155 | /* |
1156 | * set up enough so that it can read an inode | |
1157 | */ | |
1158 | sb->s_op = &ext2_sops; | |
1159 | sb->s_export_op = &ext2_export_ops; | |
1160 | sb->s_xattr = ext2_xattr_handlers; | |
123e9caf CH |
1161 | |
1162 | #ifdef CONFIG_QUOTA | |
1163 | sb->dq_op = &dquot_operations; | |
161f3b74 | 1164 | sb->s_qcop = &ext2_quotactl_ops; |
64241118 | 1165 | sb->s_quota_types = QTYPE_MASK_USR | QTYPE_MASK_GRP; |
123e9caf CH |
1166 | #endif |
1167 | ||
52fcf703 DH |
1168 | root = ext2_iget(sb, EXT2_ROOT_INO); |
1169 | if (IS_ERR(root)) { | |
1170 | ret = PTR_ERR(root); | |
0216bfcf | 1171 | goto failed_mount3; |
1da177e4 LT |
1172 | } |
1173 | if (!S_ISDIR(root->i_mode) || !root->i_blocks || !root->i_size) { | |
52fcf703 | 1174 | iput(root); |
2314b07c | 1175 | ext2_msg(sb, KERN_ERR, "error: corrupt root inode, run e2fsck"); |
0216bfcf | 1176 | goto failed_mount3; |
1da177e4 | 1177 | } |
52fcf703 | 1178 | |
48fde701 | 1179 | sb->s_root = d_make_root(root); |
52fcf703 | 1180 | if (!sb->s_root) { |
2314b07c | 1181 | ext2_msg(sb, KERN_ERR, "error: get root inode failed"); |
52fcf703 DH |
1182 | ret = -ENOMEM; |
1183 | goto failed_mount3; | |
1184 | } | |
1da177e4 | 1185 | if (EXT2_HAS_COMPAT_FEATURE(sb, EXT3_FEATURE_COMPAT_HAS_JOURNAL)) |
2314b07c OR |
1186 | ext2_msg(sb, KERN_WARNING, |
1187 | "warning: mounting ext3 filesystem as ext2"); | |
bc98a42c | 1188 | if (ext2_setup_super (sb, es, sb_rdonly(sb))) |
1751e8a6 | 1189 | sb->s_flags |= SB_RDONLY; |
4c96a68b | 1190 | ext2_write_super(sb); |
1da177e4 LT |
1191 | return 0; |
1192 | ||
1193 | cantfind_ext2: | |
1194 | if (!silent) | |
2314b07c OR |
1195 | ext2_msg(sb, KERN_ERR, |
1196 | "error: can't find an ext2 filesystem on dev %s.", | |
1197 | sb->s_id); | |
1da177e4 | 1198 | goto failed_mount; |
0216bfcf | 1199 | failed_mount3: |
569ae920 | 1200 | ext2_xattr_destroy_cache(sbi->s_ea_block_cache); |
0216bfcf MC |
1201 | percpu_counter_destroy(&sbi->s_freeblocks_counter); |
1202 | percpu_counter_destroy(&sbi->s_freeinodes_counter); | |
1203 | percpu_counter_destroy(&sbi->s_dirs_counter); | |
1da177e4 LT |
1204 | failed_mount2: |
1205 | for (i = 0; i < db_count; i++) | |
1206 | brelse(sbi->s_group_desc[i]); | |
1207 | failed_mount_group_desc: | |
1208 | kfree(sbi->s_group_desc); | |
1209 | kfree(sbi->s_debts); | |
1210 | failed_mount: | |
1211 | brelse(bh); | |
1212 | failed_sbi: | |
1213 | sb->s_fs_info = NULL; | |
0f7ee7c1 | 1214 | kfree(sbi->s_blockgroup_lock); |
1da177e4 | 1215 | kfree(sbi); |
e124a320 | 1216 | failed: |
8cf037a8 | 1217 | fs_put_dax(dax_dev); |
52fcf703 | 1218 | return ret; |
1da177e4 LT |
1219 | } |
1220 | ||
7bf0dc9b TT |
1221 | static void ext2_clear_super_error(struct super_block *sb) |
1222 | { | |
1223 | struct buffer_head *sbh = EXT2_SB(sb)->s_sbh; | |
1224 | ||
1225 | if (buffer_write_io_error(sbh)) { | |
1226 | /* | |
1227 | * Oh, dear. A previous attempt to write the | |
1228 | * superblock failed. This could happen because the | |
1229 | * USB device was yanked out. Or it could happen to | |
1230 | * be a transient write error and maybe the block will | |
1231 | * be remapped. Nothing we can do but to retry the | |
1232 | * write and hope for the best. | |
1233 | */ | |
2b8120ef | 1234 | ext2_msg(sb, KERN_ERR, |
f463589a | 1235 | "previous I/O error to superblock detected"); |
7bf0dc9b TT |
1236 | clear_buffer_write_io_error(sbh); |
1237 | set_buffer_uptodate(sbh); | |
1238 | } | |
1239 | } | |
1240 | ||
65547661 JK |
1241 | void ext2_sync_super(struct super_block *sb, struct ext2_super_block *es, |
1242 | int wait) | |
1da177e4 | 1243 | { |
7bf0dc9b | 1244 | ext2_clear_super_error(sb); |
c15271f4 | 1245 | spin_lock(&EXT2_SB(sb)->s_lock); |
1da177e4 LT |
1246 | es->s_free_blocks_count = cpu_to_le32(ext2_count_free_blocks(sb)); |
1247 | es->s_free_inodes_count = cpu_to_le32(ext2_count_free_inodes(sb)); | |
fe2c3254 | 1248 | es->s_wtime = cpu_to_le32(ktime_get_real_seconds()); |
c15271f4 JB |
1249 | /* unlock before we do IO */ |
1250 | spin_unlock(&EXT2_SB(sb)->s_lock); | |
1da177e4 | 1251 | mark_buffer_dirty(EXT2_SB(sb)->s_sbh); |
ee6921eb JB |
1252 | if (wait) |
1253 | sync_dirty_buffer(EXT2_SB(sb)->s_sbh); | |
1da177e4 LT |
1254 | } |
1255 | ||
1256 | /* | |
1257 | * In the second extended file system, it is not necessary to | |
1258 | * write the super block since we use a mapping of the | |
1259 | * disk super block in a buffer. | |
1260 | * | |
1261 | * However, this function is still used to set the fs valid | |
1262 | * flags to 0. We need to set this flag to 0 since the fs | |
1263 | * may have been checked while mounted and e2fsck may have | |
1264 | * set s_state to EXT2_VALID_FS after some corrections. | |
1265 | */ | |
40f31dd4 | 1266 | static int ext2_sync_fs(struct super_block *sb, int wait) |
1da177e4 | 1267 | { |
c15271f4 | 1268 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
40f31dd4 CH |
1269 | struct ext2_super_block *es = EXT2_SB(sb)->s_es; |
1270 | ||
a1177825 JK |
1271 | /* |
1272 | * Write quota structures to quota file, sync_blockdev() will write | |
1273 | * them to disk later | |
1274 | */ | |
1275 | dquot_writeback_dquots(sb, -1); | |
1276 | ||
c15271f4 | 1277 | spin_lock(&sbi->s_lock); |
40f31dd4 CH |
1278 | if (es->s_state & cpu_to_le16(EXT2_VALID_FS)) { |
1279 | ext2_debug("setting valid to 0\n"); | |
1280 | es->s_state &= cpu_to_le16(~EXT2_VALID_FS); | |
1da177e4 | 1281 | } |
c15271f4 | 1282 | spin_unlock(&sbi->s_lock); |
ee6921eb | 1283 | ext2_sync_super(sb, es, wait); |
40f31dd4 CH |
1284 | return 0; |
1285 | } | |
1286 | ||
1e8b212f JK |
1287 | static int ext2_freeze(struct super_block *sb) |
1288 | { | |
1289 | struct ext2_sb_info *sbi = EXT2_SB(sb); | |
1290 | ||
1291 | /* | |
1292 | * Open but unlinked files present? Keep EXT2_VALID_FS flag cleared | |
1293 | * because we have unattached inodes and thus filesystem is not fully | |
1294 | * consistent. | |
1295 | */ | |
1296 | if (atomic_long_read(&sb->s_remove_count)) { | |
1297 | ext2_sync_fs(sb, 1); | |
1298 | return 0; | |
1299 | } | |
1300 | /* Set EXT2_FS_VALID flag */ | |
1301 | spin_lock(&sbi->s_lock); | |
1302 | sbi->s_es->s_state = cpu_to_le16(sbi->s_mount_state); | |
1303 | spin_unlock(&sbi->s_lock); | |
1304 | ext2_sync_super(sb, sbi->s_es, 1); | |
1305 | ||
1306 | return 0; | |
1307 | } | |
1308 | ||
1309 | static int ext2_unfreeze(struct super_block *sb) | |
1310 | { | |
1311 | /* Just write sb to clear EXT2_VALID_FS flag */ | |
1312 | ext2_write_super(sb); | |
1313 | ||
1314 | return 0; | |
1315 | } | |
40f31dd4 | 1316 | |
65547661 | 1317 | static void ext2_write_super(struct super_block *sb) |
40f31dd4 | 1318 | { |
bc98a42c | 1319 | if (!sb_rdonly(sb)) |
40f31dd4 | 1320 | ext2_sync_fs(sb, 1); |
1da177e4 LT |
1321 | } |
1322 | ||
1323 | static int ext2_remount (struct super_block * sb, int * flags, char * data) | |
1324 | { | |
1325 | struct ext2_sb_info * sbi = EXT2_SB(sb); | |
1326 | struct ext2_super_block * es; | |
08851957 | 1327 | struct ext2_mount_options new_opts; |
50a52234 JK |
1328 | int err; |
1329 | ||
02b9984d | 1330 | sync_filesystem(sb); |
337eb00a | 1331 | |
8af634ff | 1332 | spin_lock(&sbi->s_lock); |
08851957 JK |
1333 | new_opts.s_mount_opt = sbi->s_mount_opt; |
1334 | new_opts.s_resuid = sbi->s_resuid; | |
1335 | new_opts.s_resgid = sbi->s_resgid; | |
8af634ff | 1336 | spin_unlock(&sbi->s_lock); |
1da177e4 | 1337 | |
8af634ff | 1338 | if (!parse_options(data, sb, &new_opts)) |
08851957 | 1339 | return -EINVAL; |
1da177e4 | 1340 | |
8af634ff | 1341 | spin_lock(&sbi->s_lock); |
1da177e4 | 1342 | es = sbi->s_es; |
08851957 | 1343 | if ((sbi->s_mount_opt ^ new_opts.s_mount_opt) & EXT2_MOUNT_DAX) { |
2314b07c | 1344 | ext2_msg(sb, KERN_WARNING, "warning: refusing change of " |
9c3ce9ec | 1345 | "dax flag with busy inodes while remounting"); |
08851957 | 1346 | new_opts.s_mount_opt ^= EXT2_MOUNT_DAX; |
337eb00a | 1347 | } |
1751e8a6 | 1348 | if ((bool)(*flags & SB_RDONLY) == sb_rdonly(sb)) |
08851957 | 1349 | goto out_set; |
1751e8a6 | 1350 | if (*flags & SB_RDONLY) { |
1da177e4 | 1351 | if (le16_to_cpu(es->s_state) & EXT2_VALID_FS || |
08851957 JK |
1352 | !(sbi->s_mount_state & EXT2_VALID_FS)) |
1353 | goto out_set; | |
c79d967d | 1354 | |
1da177e4 LT |
1355 | /* |
1356 | * OK, we are remounting a valid rw partition rdonly, so set | |
1357 | * the rdonly flag and then mark the partition as valid again. | |
1358 | */ | |
1359 | es->s_state = cpu_to_le16(sbi->s_mount_state); | |
fe2c3254 | 1360 | es->s_mtime = cpu_to_le32(ktime_get_real_seconds()); |
c15271f4 | 1361 | spin_unlock(&sbi->s_lock); |
c79d967d | 1362 | |
0f0dd62f | 1363 | err = dquot_suspend(sb, -1); |
08851957 JK |
1364 | if (err < 0) |
1365 | return err; | |
c79d967d | 1366 | |
4c96a68b | 1367 | ext2_sync_super(sb, es, 1); |
1da177e4 LT |
1368 | } else { |
1369 | __le32 ret = EXT2_HAS_RO_COMPAT_FEATURE(sb, | |
1370 | ~EXT2_FEATURE_RO_COMPAT_SUPP); | |
1371 | if (ret) { | |
08851957 | 1372 | spin_unlock(&sbi->s_lock); |
2314b07c OR |
1373 | ext2_msg(sb, KERN_WARNING, |
1374 | "warning: couldn't remount RDWR because of " | |
1375 | "unsupported optional features (%x).", | |
1376 | le32_to_cpu(ret)); | |
08851957 | 1377 | return -EROFS; |
1da177e4 LT |
1378 | } |
1379 | /* | |
1380 | * Mounting a RDONLY partition read-write, so reread and | |
1381 | * store the current valid flag. (It may have been changed | |
1382 | * by e2fsck since we originally mounted the partition.) | |
1383 | */ | |
1384 | sbi->s_mount_state = le16_to_cpu(es->s_state); | |
1385 | if (!ext2_setup_super (sb, es, 0)) | |
1751e8a6 | 1386 | sb->s_flags &= ~SB_RDONLY; |
c15271f4 | 1387 | spin_unlock(&sbi->s_lock); |
c79d967d | 1388 | |
4c96a68b | 1389 | ext2_write_super(sb); |
c79d967d | 1390 | |
0f0dd62f | 1391 | dquot_resume(sb, -1); |
1da177e4 | 1392 | } |
c79d967d | 1393 | |
08851957 JK |
1394 | spin_lock(&sbi->s_lock); |
1395 | out_set: | |
1396 | sbi->s_mount_opt = new_opts.s_mount_opt; | |
1397 | sbi->s_resuid = new_opts.s_resuid; | |
1398 | sbi->s_resgid = new_opts.s_resgid; | |
1751e8a6 LT |
1399 | sb->s_flags = (sb->s_flags & ~SB_POSIXACL) | |
1400 | ((sbi->s_mount_opt & EXT2_MOUNT_POSIX_ACL) ? SB_POSIXACL : 0); | |
c15271f4 | 1401 | spin_unlock(&sbi->s_lock); |
08851957 JK |
1402 | |
1403 | return 0; | |
1da177e4 LT |
1404 | } |
1405 | ||
726c3342 | 1406 | static int ext2_statfs (struct dentry * dentry, struct kstatfs * buf) |
1da177e4 | 1407 | { |
726c3342 | 1408 | struct super_block *sb = dentry->d_sb; |
1da177e4 | 1409 | struct ext2_sb_info *sbi = EXT2_SB(sb); |
e4fca01e | 1410 | struct ext2_super_block *es = sbi->s_es; |
e4fca01e | 1411 | u64 fsid; |
1da177e4 | 1412 | |
c15271f4 JB |
1413 | spin_lock(&sbi->s_lock); |
1414 | ||
1da177e4 | 1415 | if (test_opt (sb, MINIX_DF)) |
2235219b BP |
1416 | sbi->s_overhead_last = 0; |
1417 | else if (sbi->s_blocks_last != le32_to_cpu(es->s_blocks_count)) { | |
1418 | unsigned long i, overhead = 0; | |
1419 | smp_rmb(); | |
1420 | ||
1da177e4 | 1421 | /* |
2235219b BP |
1422 | * Compute the overhead (FS structures). This is constant |
1423 | * for a given filesystem unless the number of block groups | |
1424 | * changes so we cache the previous value until it does. | |
1da177e4 LT |
1425 | */ |
1426 | ||
1427 | /* | |
1428 | * All of the blocks before first_data_block are | |
1429 | * overhead | |
1430 | */ | |
e4fca01e | 1431 | overhead = le32_to_cpu(es->s_first_data_block); |
1da177e4 LT |
1432 | |
1433 | /* | |
1434 | * Add the overhead attributed to the superblock and | |
1435 | * block group descriptors. If the sparse superblocks | |
1436 | * feature is turned on, then not all groups have this. | |
1437 | */ | |
1438 | for (i = 0; i < sbi->s_groups_count; i++) | |
1439 | overhead += ext2_bg_has_super(sb, i) + | |
1440 | ext2_bg_num_gdb(sb, i); | |
1441 | ||
1442 | /* | |
1443 | * Every block group has an inode bitmap, a block | |
1444 | * bitmap, and an inode table. | |
1445 | */ | |
1446 | overhead += (sbi->s_groups_count * | |
1447 | (2 + sbi->s_itb_per_group)); | |
2235219b BP |
1448 | sbi->s_overhead_last = overhead; |
1449 | smp_wmb(); | |
1450 | sbi->s_blocks_last = le32_to_cpu(es->s_blocks_count); | |
1da177e4 LT |
1451 | } |
1452 | ||
1453 | buf->f_type = EXT2_SUPER_MAGIC; | |
1454 | buf->f_bsize = sb->s_blocksize; | |
2235219b | 1455 | buf->f_blocks = le32_to_cpu(es->s_blocks_count) - sbi->s_overhead_last; |
1da177e4 | 1456 | buf->f_bfree = ext2_count_free_blocks(sb); |
2235219b | 1457 | es->s_free_blocks_count = cpu_to_le32(buf->f_bfree); |
e4fca01e PE |
1458 | buf->f_bavail = buf->f_bfree - le32_to_cpu(es->s_r_blocks_count); |
1459 | if (buf->f_bfree < le32_to_cpu(es->s_r_blocks_count)) | |
1da177e4 | 1460 | buf->f_bavail = 0; |
e4fca01e PE |
1461 | buf->f_files = le32_to_cpu(es->s_inodes_count); |
1462 | buf->f_ffree = ext2_count_free_inodes(sb); | |
2235219b | 1463 | es->s_free_inodes_count = cpu_to_le32(buf->f_ffree); |
1da177e4 | 1464 | buf->f_namelen = EXT2_NAME_LEN; |
e4fca01e PE |
1465 | fsid = le64_to_cpup((void *)es->s_uuid) ^ |
1466 | le64_to_cpup((void *)es->s_uuid + sizeof(u64)); | |
1467 | buf->f_fsid.val[0] = fsid & 0xFFFFFFFFUL; | |
1468 | buf->f_fsid.val[1] = (fsid >> 32) & 0xFFFFFFFFUL; | |
c15271f4 | 1469 | spin_unlock(&sbi->s_lock); |
1da177e4 LT |
1470 | return 0; |
1471 | } | |
1472 | ||
152a0836 AV |
1473 | static struct dentry *ext2_mount(struct file_system_type *fs_type, |
1474 | int flags, const char *dev_name, void *data) | |
1da177e4 | 1475 | { |
152a0836 | 1476 | return mount_bdev(fs_type, flags, dev_name, data, ext2_fill_super); |
1da177e4 LT |
1477 | } |
1478 | ||
1479 | #ifdef CONFIG_QUOTA | |
1480 | ||
1481 | /* Read data from quotafile - avoid pagecache and such because we cannot afford | |
1482 | * acquiring the locks... As quota files are never truncated and quota code | |
25985edc | 1483 | * itself serializes the operations (and no one else should touch the files) |
1da177e4 LT |
1484 | * we don't have to be afraid of races */ |
1485 | static ssize_t ext2_quota_read(struct super_block *sb, int type, char *data, | |
1486 | size_t len, loff_t off) | |
1487 | { | |
1488 | struct inode *inode = sb_dqopt(sb)->files[type]; | |
1489 | sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); | |
1490 | int err = 0; | |
1491 | int offset = off & (sb->s_blocksize - 1); | |
1492 | int tocopy; | |
1493 | size_t toread; | |
1494 | struct buffer_head tmp_bh; | |
1495 | struct buffer_head *bh; | |
1496 | loff_t i_size = i_size_read(inode); | |
1497 | ||
1498 | if (off > i_size) | |
1499 | return 0; | |
1500 | if (off+len > i_size) | |
1501 | len = i_size-off; | |
1502 | toread = len; | |
1503 | while (toread > 0) { | |
1504 | tocopy = sb->s_blocksize - offset < toread ? | |
1505 | sb->s_blocksize - offset : toread; | |
1506 | ||
1507 | tmp_bh.b_state = 0; | |
c16831b4 | 1508 | tmp_bh.b_size = sb->s_blocksize; |
1da177e4 | 1509 | err = ext2_get_block(inode, blk, &tmp_bh, 0); |
a686cd89 | 1510 | if (err < 0) |
1da177e4 LT |
1511 | return err; |
1512 | if (!buffer_mapped(&tmp_bh)) /* A hole? */ | |
1513 | memset(data, 0, tocopy); | |
1514 | else { | |
1515 | bh = sb_bread(sb, tmp_bh.b_blocknr); | |
1516 | if (!bh) | |
1517 | return -EIO; | |
1518 | memcpy(data, bh->b_data+offset, tocopy); | |
1519 | brelse(bh); | |
1520 | } | |
1521 | offset = 0; | |
1522 | toread -= tocopy; | |
1523 | data += tocopy; | |
1524 | blk++; | |
1525 | } | |
1526 | return len; | |
1527 | } | |
1528 | ||
1529 | /* Write to quotafile */ | |
1530 | static ssize_t ext2_quota_write(struct super_block *sb, int type, | |
1531 | const char *data, size_t len, loff_t off) | |
1532 | { | |
1533 | struct inode *inode = sb_dqopt(sb)->files[type]; | |
1534 | sector_t blk = off >> EXT2_BLOCK_SIZE_BITS(sb); | |
1535 | int err = 0; | |
1536 | int offset = off & (sb->s_blocksize - 1); | |
1537 | int tocopy; | |
1538 | size_t towrite = len; | |
1539 | struct buffer_head tmp_bh; | |
1540 | struct buffer_head *bh; | |
1541 | ||
1da177e4 LT |
1542 | while (towrite > 0) { |
1543 | tocopy = sb->s_blocksize - offset < towrite ? | |
1544 | sb->s_blocksize - offset : towrite; | |
1545 | ||
1546 | tmp_bh.b_state = 0; | |
df4e7ac0 | 1547 | tmp_bh.b_size = sb->s_blocksize; |
1da177e4 | 1548 | err = ext2_get_block(inode, blk, &tmp_bh, 1); |
a686cd89 | 1549 | if (err < 0) |
1da177e4 LT |
1550 | goto out; |
1551 | if (offset || tocopy != EXT2_BLOCK_SIZE(sb)) | |
1552 | bh = sb_bread(sb, tmp_bh.b_blocknr); | |
1553 | else | |
1554 | bh = sb_getblk(sb, tmp_bh.b_blocknr); | |
2b0542a4 | 1555 | if (unlikely(!bh)) { |
1da177e4 LT |
1556 | err = -EIO; |
1557 | goto out; | |
1558 | } | |
1559 | lock_buffer(bh); | |
1560 | memcpy(bh->b_data+offset, data, tocopy); | |
1561 | flush_dcache_page(bh->b_page); | |
1562 | set_buffer_uptodate(bh); | |
1563 | mark_buffer_dirty(bh); | |
1564 | unlock_buffer(bh); | |
1565 | brelse(bh); | |
1566 | offset = 0; | |
1567 | towrite -= tocopy; | |
1568 | data += tocopy; | |
1569 | blk++; | |
1570 | } | |
1571 | out: | |
e2a3fde7 | 1572 | if (len == towrite) |
1da177e4 LT |
1573 | return err; |
1574 | if (inode->i_size < off+len-towrite) | |
1575 | i_size_write(inode, off+len-towrite); | |
e1d747d9 | 1576 | inode_inc_iversion(inode); |
078cd827 | 1577 | inode->i_mtime = inode->i_ctime = current_time(inode); |
1da177e4 | 1578 | mark_inode_dirty(inode); |
1da177e4 LT |
1579 | return len - towrite; |
1580 | } | |
1581 | ||
161f3b74 JK |
1582 | static int ext2_quota_on(struct super_block *sb, int type, int format_id, |
1583 | const struct path *path) | |
1584 | { | |
1585 | int err; | |
1586 | struct inode *inode; | |
1587 | ||
1588 | err = dquot_quota_on(sb, type, format_id, path); | |
1589 | if (err) | |
1590 | return err; | |
1591 | ||
1592 | inode = d_inode(path->dentry); | |
1593 | inode_lock(inode); | |
1594 | EXT2_I(inode)->i_flags |= EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL; | |
1595 | inode_set_flags(inode, S_NOATIME | S_IMMUTABLE, | |
1596 | S_NOATIME | S_IMMUTABLE); | |
1597 | inode_unlock(inode); | |
1598 | mark_inode_dirty(inode); | |
1599 | ||
1600 | return 0; | |
1601 | } | |
1602 | ||
1603 | static int ext2_quota_off(struct super_block *sb, int type) | |
1604 | { | |
1605 | struct inode *inode = sb_dqopt(sb)->files[type]; | |
1606 | int err; | |
1607 | ||
1608 | if (!inode || !igrab(inode)) | |
1609 | goto out; | |
1610 | ||
1611 | err = dquot_quota_off(sb, type); | |
1612 | if (err) | |
1613 | goto out_put; | |
1614 | ||
1615 | inode_lock(inode); | |
1616 | EXT2_I(inode)->i_flags &= ~(EXT2_NOATIME_FL | EXT2_IMMUTABLE_FL); | |
1617 | inode_set_flags(inode, 0, S_NOATIME | S_IMMUTABLE); | |
1618 | inode_unlock(inode); | |
1619 | mark_inode_dirty(inode); | |
1620 | out_put: | |
1621 | iput(inode); | |
1622 | return err; | |
1623 | out: | |
1624 | return dquot_quota_off(sb, type); | |
1625 | } | |
1626 | ||
1da177e4 LT |
1627 | #endif |
1628 | ||
1629 | static struct file_system_type ext2_fs_type = { | |
1630 | .owner = THIS_MODULE, | |
1631 | .name = "ext2", | |
152a0836 | 1632 | .mount = ext2_mount, |
1da177e4 | 1633 | .kill_sb = kill_block_super, |
46b15caa | 1634 | .fs_flags = FS_REQUIRES_DEV, |
1da177e4 | 1635 | }; |
7f78e035 | 1636 | MODULE_ALIAS_FS("ext2"); |
1da177e4 LT |
1637 | |
1638 | static int __init init_ext2_fs(void) | |
1639 | { | |
be0726d3 JK |
1640 | int err; |
1641 | ||
1da177e4 LT |
1642 | err = init_inodecache(); |
1643 | if (err) | |
be0726d3 | 1644 | return err; |
1da177e4 LT |
1645 | err = register_filesystem(&ext2_fs_type); |
1646 | if (err) | |
1647 | goto out; | |
1648 | return 0; | |
1649 | out: | |
1650 | destroy_inodecache(); | |
1da177e4 LT |
1651 | return err; |
1652 | } | |
1653 | ||
1654 | static void __exit exit_ext2_fs(void) | |
1655 | { | |
1656 | unregister_filesystem(&ext2_fs_type); | |
1657 | destroy_inodecache(); | |
1da177e4 LT |
1658 | } |
1659 | ||
302bf2f3 PG |
1660 | MODULE_AUTHOR("Remy Card and others"); |
1661 | MODULE_DESCRIPTION("Second Extended Filesystem"); | |
1662 | MODULE_LICENSE("GPL"); | |
1da177e4 LT |
1663 | module_init(init_ext2_fs) |
1664 | module_exit(exit_ext2_fs) |