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1da177e4 LT |
1 | /* |
2 | * JFFS2 -- Journalling Flash File System, Version 2. | |
3 | * | |
4 | * Copyright (C) 2001-2003 Red Hat, Inc. | |
5 | * | |
6 | * Created by David Woodhouse <dwmw2@infradead.org> | |
7 | * | |
8 | * For licensing information, see the file 'LICENCE' in this directory. | |
9 | * | |
182ec4ee | 10 | * $Id: super.c,v 1.110 2005/11/07 11:14:42 gleixner Exp $ |
1da177e4 LT |
11 | * |
12 | */ | |
13 | ||
14 | #include <linux/config.h> | |
15 | #include <linux/kernel.h> | |
16 | #include <linux/module.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/init.h> | |
19 | #include <linux/list.h> | |
20 | #include <linux/fs.h> | |
21 | #include <linux/mount.h> | |
22 | #include <linux/jffs2.h> | |
23 | #include <linux/pagemap.h> | |
24 | #include <linux/mtd/mtd.h> | |
25 | #include <linux/ctype.h> | |
26 | #include <linux/namei.h> | |
27 | #include "compr.h" | |
28 | #include "nodelist.h" | |
29 | ||
30 | static void jffs2_put_super(struct super_block *); | |
31 | ||
32 | static kmem_cache_t *jffs2_inode_cachep; | |
33 | ||
34 | static struct inode *jffs2_alloc_inode(struct super_block *sb) | |
35 | { | |
36 | struct jffs2_inode_info *ei; | |
37 | ei = (struct jffs2_inode_info *)kmem_cache_alloc(jffs2_inode_cachep, SLAB_KERNEL); | |
38 | if (!ei) | |
39 | return NULL; | |
40 | return &ei->vfs_inode; | |
41 | } | |
42 | ||
43 | static void jffs2_destroy_inode(struct inode *inode) | |
44 | { | |
45 | kmem_cache_free(jffs2_inode_cachep, JFFS2_INODE_INFO(inode)); | |
46 | } | |
47 | ||
48 | static void jffs2_i_init_once(void * foo, kmem_cache_t * cachep, unsigned long flags) | |
49 | { | |
50 | struct jffs2_inode_info *ei = (struct jffs2_inode_info *) foo; | |
51 | ||
52 | if ((flags & (SLAB_CTOR_VERIFY|SLAB_CTOR_CONSTRUCTOR)) == | |
53 | SLAB_CTOR_CONSTRUCTOR) { | |
21eeb7aa | 54 | init_MUTEX(&ei->sem); |
1da177e4 LT |
55 | inode_init_once(&ei->vfs_inode); |
56 | } | |
57 | } | |
58 | ||
59 | static int jffs2_sync_fs(struct super_block *sb, int wait) | |
60 | { | |
61 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
62 | ||
63 | down(&c->alloc_sem); | |
64 | jffs2_flush_wbuf_pad(c); | |
182ec4ee | 65 | up(&c->alloc_sem); |
1da177e4 LT |
66 | return 0; |
67 | } | |
68 | ||
69 | static struct super_operations jffs2_super_operations = | |
70 | { | |
71 | .alloc_inode = jffs2_alloc_inode, | |
72 | .destroy_inode =jffs2_destroy_inode, | |
73 | .read_inode = jffs2_read_inode, | |
74 | .put_super = jffs2_put_super, | |
75 | .write_super = jffs2_write_super, | |
76 | .statfs = jffs2_statfs, | |
77 | .remount_fs = jffs2_remount_fs, | |
78 | .clear_inode = jffs2_clear_inode, | |
79 | .dirty_inode = jffs2_dirty_inode, | |
80 | .sync_fs = jffs2_sync_fs, | |
81 | }; | |
82 | ||
83 | static int jffs2_sb_compare(struct super_block *sb, void *data) | |
84 | { | |
85 | struct jffs2_sb_info *p = data; | |
86 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
87 | ||
88 | /* The superblocks are considered to be equivalent if the underlying MTD | |
89 | device is the same one */ | |
90 | if (c->mtd == p->mtd) { | |
91 | D1(printk(KERN_DEBUG "jffs2_sb_compare: match on device %d (\"%s\")\n", p->mtd->index, p->mtd->name)); | |
92 | return 1; | |
93 | } else { | |
94 | D1(printk(KERN_DEBUG "jffs2_sb_compare: No match, device %d (\"%s\"), device %d (\"%s\")\n", | |
95 | c->mtd->index, c->mtd->name, p->mtd->index, p->mtd->name)); | |
96 | return 0; | |
97 | } | |
98 | } | |
99 | ||
100 | static int jffs2_sb_set(struct super_block *sb, void *data) | |
101 | { | |
102 | struct jffs2_sb_info *p = data; | |
103 | ||
104 | /* For persistence of NFS exports etc. we use the same s_dev | |
105 | each time we mount the device, don't just use an anonymous | |
106 | device */ | |
107 | sb->s_fs_info = p; | |
108 | p->os_priv = sb; | |
109 | sb->s_dev = MKDEV(MTD_BLOCK_MAJOR, p->mtd->index); | |
110 | ||
111 | return 0; | |
112 | } | |
113 | ||
454e2398 DH |
114 | static int jffs2_get_sb_mtd(struct file_system_type *fs_type, |
115 | int flags, const char *dev_name, | |
116 | void *data, struct mtd_info *mtd, | |
117 | struct vfsmount *mnt) | |
1da177e4 LT |
118 | { |
119 | struct super_block *sb; | |
120 | struct jffs2_sb_info *c; | |
121 | int ret; | |
122 | ||
123 | c = kmalloc(sizeof(*c), GFP_KERNEL); | |
124 | if (!c) | |
454e2398 | 125 | return -ENOMEM; |
1da177e4 LT |
126 | memset(c, 0, sizeof(*c)); |
127 | c->mtd = mtd; | |
128 | ||
129 | sb = sget(fs_type, jffs2_sb_compare, jffs2_sb_set, c); | |
130 | ||
131 | if (IS_ERR(sb)) | |
454e2398 | 132 | goto out_error; |
1da177e4 LT |
133 | |
134 | if (sb->s_root) { | |
135 | /* New mountpoint for JFFS2 which is already mounted */ | |
136 | D1(printk(KERN_DEBUG "jffs2_get_sb_mtd(): Device %d (\"%s\") is already mounted\n", | |
137 | mtd->index, mtd->name)); | |
454e2398 | 138 | ret = simple_set_mnt(mnt, sb); |
1da177e4 LT |
139 | goto out_put; |
140 | } | |
141 | ||
142 | D1(printk(KERN_DEBUG "jffs2_get_sb_mtd(): New superblock for device %d (\"%s\")\n", | |
143 | mtd->index, mtd->name)); | |
144 | ||
b6220598 AB |
145 | /* Initialize JFFS2 superblock locks, the further initialization will be |
146 | * done later */ | |
147 | init_MUTEX(&c->alloc_sem); | |
148 | init_MUTEX(&c->erase_free_sem); | |
149 | init_waitqueue_head(&c->erase_wait); | |
150 | init_waitqueue_head(&c->inocache_wq); | |
151 | spin_lock_init(&c->erase_completion_lock); | |
152 | spin_lock_init(&c->inocache_lock); | |
153 | ||
1da177e4 LT |
154 | sb->s_op = &jffs2_super_operations; |
155 | sb->s_flags = flags | MS_NOATIME; | |
aa98d7cf KK |
156 | sb->s_xattr = jffs2_xattr_handlers; |
157 | #ifdef CONFIG_JFFS2_FS_POSIX_ACL | |
158 | sb->s_flags |= MS_POSIXACL; | |
159 | #endif | |
9b04c997 | 160 | ret = jffs2_do_fill_super(sb, data, flags & MS_SILENT ? 1 : 0); |
1da177e4 LT |
161 | |
162 | if (ret) { | |
163 | /* Failure case... */ | |
164 | up_write(&sb->s_umount); | |
165 | deactivate_super(sb); | |
454e2398 | 166 | return ret; |
1da177e4 LT |
167 | } |
168 | ||
169 | sb->s_flags |= MS_ACTIVE; | |
454e2398 | 170 | return simple_set_mnt(mnt, sb); |
1da177e4 | 171 | |
454e2398 DH |
172 | out_error: |
173 | ret = PTR_ERR(sb); | |
1da177e4 LT |
174 | out_put: |
175 | kfree(c); | |
176 | put_mtd_device(mtd); | |
177 | ||
454e2398 | 178 | return ret; |
1da177e4 LT |
179 | } |
180 | ||
454e2398 DH |
181 | static int jffs2_get_sb_mtdnr(struct file_system_type *fs_type, |
182 | int flags, const char *dev_name, | |
183 | void *data, int mtdnr, | |
184 | struct vfsmount *mnt) | |
1da177e4 LT |
185 | { |
186 | struct mtd_info *mtd; | |
187 | ||
188 | mtd = get_mtd_device(NULL, mtdnr); | |
189 | if (!mtd) { | |
190 | D1(printk(KERN_DEBUG "jffs2: MTD device #%u doesn't appear to exist\n", mtdnr)); | |
454e2398 | 191 | return -EINVAL; |
1da177e4 LT |
192 | } |
193 | ||
454e2398 | 194 | return jffs2_get_sb_mtd(fs_type, flags, dev_name, data, mtd, mnt); |
1da177e4 LT |
195 | } |
196 | ||
454e2398 DH |
197 | static int jffs2_get_sb(struct file_system_type *fs_type, |
198 | int flags, const char *dev_name, | |
199 | void *data, struct vfsmount *mnt) | |
1da177e4 LT |
200 | { |
201 | int err; | |
202 | struct nameidata nd; | |
203 | int mtdnr; | |
204 | ||
205 | if (!dev_name) | |
454e2398 | 206 | return -EINVAL; |
1da177e4 LT |
207 | |
208 | D1(printk(KERN_DEBUG "jffs2_get_sb(): dev_name \"%s\"\n", dev_name)); | |
209 | ||
210 | /* The preferred way of mounting in future; especially when | |
211 | CONFIG_BLK_DEV is implemented - we specify the underlying | |
182ec4ee | 212 | MTD device by number or by name, so that we don't require |
1da177e4 LT |
213 | block device support to be present in the kernel. */ |
214 | ||
215 | /* FIXME: How to do the root fs this way? */ | |
216 | ||
217 | if (dev_name[0] == 'm' && dev_name[1] == 't' && dev_name[2] == 'd') { | |
218 | /* Probably mounting without the blkdev crap */ | |
219 | if (dev_name[3] == ':') { | |
220 | struct mtd_info *mtd; | |
221 | ||
222 | /* Mount by MTD device name */ | |
223 | D1(printk(KERN_DEBUG "jffs2_get_sb(): mtd:%%s, name \"%s\"\n", dev_name+4)); | |
224 | for (mtdnr = 0; mtdnr < MAX_MTD_DEVICES; mtdnr++) { | |
225 | mtd = get_mtd_device(NULL, mtdnr); | |
226 | if (mtd) { | |
227 | if (!strcmp(mtd->name, dev_name+4)) | |
454e2398 | 228 | return jffs2_get_sb_mtd(fs_type, flags, dev_name, data, mtd, mnt); |
1da177e4 LT |
229 | put_mtd_device(mtd); |
230 | } | |
231 | } | |
232 | printk(KERN_NOTICE "jffs2_get_sb(): MTD device with name \"%s\" not found.\n", dev_name+4); | |
233 | } else if (isdigit(dev_name[3])) { | |
234 | /* Mount by MTD device number name */ | |
235 | char *endptr; | |
182ec4ee | 236 | |
1da177e4 LT |
237 | mtdnr = simple_strtoul(dev_name+3, &endptr, 0); |
238 | if (!*endptr) { | |
239 | /* It was a valid number */ | |
240 | D1(printk(KERN_DEBUG "jffs2_get_sb(): mtd%%d, mtdnr %d\n", mtdnr)); | |
454e2398 | 241 | return jffs2_get_sb_mtdnr(fs_type, flags, dev_name, data, mtdnr, mnt); |
1da177e4 LT |
242 | } |
243 | } | |
244 | } | |
245 | ||
182ec4ee | 246 | /* Try the old way - the hack where we allowed users to mount |
1da177e4 LT |
247 | /dev/mtdblock$(n) but didn't actually _use_ the blkdev */ |
248 | ||
249 | err = path_lookup(dev_name, LOOKUP_FOLLOW, &nd); | |
250 | ||
251 | D1(printk(KERN_DEBUG "jffs2_get_sb(): path_lookup() returned %d, inode %p\n", | |
252 | err, nd.dentry->d_inode)); | |
253 | ||
254 | if (err) | |
454e2398 | 255 | return err; |
1da177e4 LT |
256 | |
257 | err = -EINVAL; | |
258 | ||
259 | if (!S_ISBLK(nd.dentry->d_inode->i_mode)) | |
260 | goto out; | |
261 | ||
262 | if (nd.mnt->mnt_flags & MNT_NODEV) { | |
263 | err = -EACCES; | |
264 | goto out; | |
265 | } | |
266 | ||
267 | if (imajor(nd.dentry->d_inode) != MTD_BLOCK_MAJOR) { | |
9b04c997 | 268 | if (!(flags & MS_SILENT)) |
1da177e4 LT |
269 | printk(KERN_NOTICE "Attempt to mount non-MTD device \"%s\" as JFFS2\n", |
270 | dev_name); | |
271 | goto out; | |
272 | } | |
273 | ||
274 | mtdnr = iminor(nd.dentry->d_inode); | |
275 | path_release(&nd); | |
276 | ||
454e2398 | 277 | return jffs2_get_sb_mtdnr(fs_type, flags, dev_name, data, mtdnr, mnt); |
1da177e4 LT |
278 | |
279 | out: | |
280 | path_release(&nd); | |
454e2398 | 281 | return err; |
1da177e4 LT |
282 | } |
283 | ||
284 | static void jffs2_put_super (struct super_block *sb) | |
285 | { | |
286 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
287 | ||
288 | D2(printk(KERN_DEBUG "jffs2: jffs2_put_super()\n")); | |
289 | ||
1da177e4 LT |
290 | down(&c->alloc_sem); |
291 | jffs2_flush_wbuf_pad(c); | |
292 | up(&c->alloc_sem); | |
e631ddba FH |
293 | |
294 | jffs2_sum_exit(c); | |
295 | ||
1da177e4 LT |
296 | jffs2_free_ino_caches(c); |
297 | jffs2_free_raw_node_refs(c); | |
4ce1f562 | 298 | if (jffs2_blocks_use_vmalloc(c)) |
1da177e4 LT |
299 | vfree(c->blocks); |
300 | else | |
301 | kfree(c->blocks); | |
302 | jffs2_flash_cleanup(c); | |
303 | kfree(c->inocache_list); | |
aa98d7cf | 304 | jffs2_clear_xattr_subsystem(c); |
1da177e4 LT |
305 | if (c->mtd->sync) |
306 | c->mtd->sync(c->mtd); | |
307 | ||
308 | D1(printk(KERN_DEBUG "jffs2_put_super returning\n")); | |
309 | } | |
310 | ||
311 | static void jffs2_kill_sb(struct super_block *sb) | |
312 | { | |
313 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
a69dde91 AB |
314 | if (!(sb->s_flags & MS_RDONLY)) |
315 | jffs2_stop_garbage_collect_thread(c); | |
1da177e4 LT |
316 | generic_shutdown_super(sb); |
317 | put_mtd_device(c->mtd); | |
318 | kfree(c); | |
319 | } | |
320 | ||
321 | static struct file_system_type jffs2_fs_type = { | |
322 | .owner = THIS_MODULE, | |
323 | .name = "jffs2", | |
324 | .get_sb = jffs2_get_sb, | |
325 | .kill_sb = jffs2_kill_sb, | |
326 | }; | |
327 | ||
328 | static int __init init_jffs2_fs(void) | |
329 | { | |
330 | int ret; | |
331 | ||
3e68fbb5 DW |
332 | /* Paranoia checks for on-medium structures. If we ask GCC |
333 | to pack them with __attribute__((packed)) then it _also_ | |
334 | assumes that they're not aligned -- so it emits crappy | |
335 | code on some architectures. Ideally we want an attribute | |
336 | which means just 'no padding', without the alignment | |
337 | thing. But GCC doesn't have that -- we have to just | |
338 | hope the structs are the right sizes, instead. */ | |
339 | BUG_ON(sizeof(struct jffs2_unknown_node) != 12); | |
340 | BUG_ON(sizeof(struct jffs2_raw_dirent) != 40); | |
341 | BUG_ON(sizeof(struct jffs2_raw_inode) != 68); | |
342 | BUG_ON(sizeof(struct jffs2_raw_summary) != 32); | |
343 | ||
1da177e4 | 344 | printk(KERN_INFO "JFFS2 version 2.2." |
2f82ce1e | 345 | #ifdef CONFIG_JFFS2_FS_WRITEBUFFER |
1da177e4 | 346 | " (NAND)" |
e631ddba FH |
347 | #endif |
348 | #ifdef CONFIG_JFFS2_SUMMARY | |
349 | " (SUMMARY) " | |
1da177e4 | 350 | #endif |
3e68fbb5 | 351 | " (C) 2001-2006 Red Hat, Inc.\n"); |
1da177e4 LT |
352 | |
353 | jffs2_inode_cachep = kmem_cache_create("jffs2_i", | |
354 | sizeof(struct jffs2_inode_info), | |
fffb60f9 PJ |
355 | 0, (SLAB_RECLAIM_ACCOUNT| |
356 | SLAB_MEM_SPREAD), | |
1da177e4 LT |
357 | jffs2_i_init_once, NULL); |
358 | if (!jffs2_inode_cachep) { | |
359 | printk(KERN_ERR "JFFS2 error: Failed to initialise inode cache\n"); | |
360 | return -ENOMEM; | |
361 | } | |
362 | ret = jffs2_compressors_init(); | |
363 | if (ret) { | |
364 | printk(KERN_ERR "JFFS2 error: Failed to initialise compressors\n"); | |
365 | goto out; | |
366 | } | |
367 | ret = jffs2_create_slab_caches(); | |
368 | if (ret) { | |
369 | printk(KERN_ERR "JFFS2 error: Failed to initialise slab caches\n"); | |
370 | goto out_compressors; | |
371 | } | |
372 | ret = register_filesystem(&jffs2_fs_type); | |
373 | if (ret) { | |
374 | printk(KERN_ERR "JFFS2 error: Failed to register filesystem\n"); | |
375 | goto out_slab; | |
376 | } | |
377 | return 0; | |
378 | ||
379 | out_slab: | |
380 | jffs2_destroy_slab_caches(); | |
381 | out_compressors: | |
382 | jffs2_compressors_exit(); | |
383 | out: | |
384 | kmem_cache_destroy(jffs2_inode_cachep); | |
385 | return ret; | |
386 | } | |
387 | ||
388 | static void __exit exit_jffs2_fs(void) | |
389 | { | |
390 | unregister_filesystem(&jffs2_fs_type); | |
391 | jffs2_destroy_slab_caches(); | |
392 | jffs2_compressors_exit(); | |
393 | kmem_cache_destroy(jffs2_inode_cachep); | |
394 | } | |
395 | ||
396 | module_init(init_jffs2_fs); | |
397 | module_exit(exit_jffs2_fs); | |
398 | ||
399 | MODULE_DESCRIPTION("The Journalling Flash File System, v2"); | |
400 | MODULE_AUTHOR("Red Hat, Inc."); | |
182ec4ee | 401 | MODULE_LICENSE("GPL"); // Actually dual-licensed, but it doesn't matter for |
1da177e4 | 402 | // the sake of this tag. It's Free Software. |