Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * JFFS2 -- Journalling Flash File System, Version 2. | |
3 | * | |
c00c310e | 4 | * Copyright © 2001-2007 Red Hat, Inc. |
1da177e4 LT |
5 | * |
6 | * Created by David Woodhouse <dwmw2@infradead.org> | |
7 | * | |
8 | * For licensing information, see the file 'LICENCE' in this directory. | |
9 | * | |
1da177e4 LT |
10 | */ |
11 | ||
16f7e0fe | 12 | #include <linux/capability.h> |
1da177e4 LT |
13 | #include <linux/kernel.h> |
14 | #include <linux/sched.h> | |
15 | #include <linux/fs.h> | |
16 | #include <linux/list.h> | |
17 | #include <linux/mtd/mtd.h> | |
18 | #include <linux/pagemap.h> | |
19 | #include <linux/slab.h> | |
20 | #include <linux/vmalloc.h> | |
21 | #include <linux/vfs.h> | |
22 | #include <linux/crc32.h> | |
23 | #include "nodelist.h" | |
24 | ||
25 | static int jffs2_flash_setup(struct jffs2_sb_info *c); | |
26 | ||
9ed437c5 | 27 | int jffs2_do_setattr (struct inode *inode, struct iattr *iattr) |
1da177e4 LT |
28 | { |
29 | struct jffs2_full_dnode *old_metadata, *new_metadata; | |
30 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); | |
31 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
32 | struct jffs2_raw_inode *ri; | |
aef9ab47 | 33 | union jffs2_device_node dev; |
1da177e4 LT |
34 | unsigned char *mdata = NULL; |
35 | int mdatalen = 0; | |
36 | unsigned int ivalid; | |
9fe4854c | 37 | uint32_t alloclen; |
1da177e4 | 38 | int ret; |
9ed437c5 | 39 | |
1da177e4 | 40 | D1(printk(KERN_DEBUG "jffs2_setattr(): ino #%lu\n", inode->i_ino)); |
1da177e4 LT |
41 | |
42 | /* Special cases - we don't want more than one data node | |
43 | for these types on the medium at any time. So setattr | |
44 | must read the original data associated with the node | |
45 | (i.e. the device numbers or the target name) and write | |
46 | it out again with the appropriate data attached */ | |
47 | if (S_ISBLK(inode->i_mode) || S_ISCHR(inode->i_mode)) { | |
48 | /* For these, we don't actually need to read the old node */ | |
aef9ab47 | 49 | mdatalen = jffs2_encode_dev(&dev, inode->i_rdev); |
1da177e4 | 50 | mdata = (char *)&dev; |
1da177e4 LT |
51 | D1(printk(KERN_DEBUG "jffs2_setattr(): Writing %d bytes of kdev_t\n", mdatalen)); |
52 | } else if (S_ISLNK(inode->i_mode)) { | |
422138dd | 53 | down(&f->sem); |
1da177e4 LT |
54 | mdatalen = f->metadata->size; |
55 | mdata = kmalloc(f->metadata->size, GFP_USER); | |
422138dd DB |
56 | if (!mdata) { |
57 | up(&f->sem); | |
1da177e4 | 58 | return -ENOMEM; |
422138dd | 59 | } |
1da177e4 LT |
60 | ret = jffs2_read_dnode(c, f, f->metadata, mdata, 0, mdatalen); |
61 | if (ret) { | |
422138dd | 62 | up(&f->sem); |
1da177e4 LT |
63 | kfree(mdata); |
64 | return ret; | |
65 | } | |
422138dd | 66 | up(&f->sem); |
1da177e4 LT |
67 | D1(printk(KERN_DEBUG "jffs2_setattr(): Writing %d bytes of symlink target\n", mdatalen)); |
68 | } | |
69 | ||
70 | ri = jffs2_alloc_raw_inode(); | |
71 | if (!ri) { | |
72 | if (S_ISLNK(inode->i_mode)) | |
73 | kfree(mdata); | |
74 | return -ENOMEM; | |
75 | } | |
182ec4ee | 76 | |
9fe4854c DW |
77 | ret = jffs2_reserve_space(c, sizeof(*ri) + mdatalen, &alloclen, |
78 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); | |
1da177e4 LT |
79 | if (ret) { |
80 | jffs2_free_raw_inode(ri); | |
81 | if (S_ISLNK(inode->i_mode & S_IFMT)) | |
82 | kfree(mdata); | |
83 | return ret; | |
84 | } | |
85 | down(&f->sem); | |
86 | ivalid = iattr->ia_valid; | |
182ec4ee | 87 | |
1da177e4 LT |
88 | ri->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); |
89 | ri->nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE); | |
90 | ri->totlen = cpu_to_je32(sizeof(*ri) + mdatalen); | |
91 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); | |
92 | ||
93 | ri->ino = cpu_to_je32(inode->i_ino); | |
94 | ri->version = cpu_to_je32(++f->highest_version); | |
95 | ||
96 | ri->uid = cpu_to_je16((ivalid & ATTR_UID)?iattr->ia_uid:inode->i_uid); | |
97 | ri->gid = cpu_to_je16((ivalid & ATTR_GID)?iattr->ia_gid:inode->i_gid); | |
98 | ||
99 | if (ivalid & ATTR_MODE) | |
857013b8 | 100 | ri->mode = cpu_to_jemode(iattr->ia_mode); |
1da177e4 LT |
101 | else |
102 | ri->mode = cpu_to_jemode(inode->i_mode); | |
103 | ||
104 | ||
105 | ri->isize = cpu_to_je32((ivalid & ATTR_SIZE)?iattr->ia_size:inode->i_size); | |
106 | ri->atime = cpu_to_je32(I_SEC((ivalid & ATTR_ATIME)?iattr->ia_atime:inode->i_atime)); | |
107 | ri->mtime = cpu_to_je32(I_SEC((ivalid & ATTR_MTIME)?iattr->ia_mtime:inode->i_mtime)); | |
108 | ri->ctime = cpu_to_je32(I_SEC((ivalid & ATTR_CTIME)?iattr->ia_ctime:inode->i_ctime)); | |
109 | ||
110 | ri->offset = cpu_to_je32(0); | |
111 | ri->csize = ri->dsize = cpu_to_je32(mdatalen); | |
112 | ri->compr = JFFS2_COMPR_NONE; | |
113 | if (ivalid & ATTR_SIZE && inode->i_size < iattr->ia_size) { | |
114 | /* It's an extension. Make it a hole node */ | |
115 | ri->compr = JFFS2_COMPR_ZERO; | |
116 | ri->dsize = cpu_to_je32(iattr->ia_size - inode->i_size); | |
117 | ri->offset = cpu_to_je32(inode->i_size); | |
118 | } | |
119 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); | |
120 | if (mdatalen) | |
121 | ri->data_crc = cpu_to_je32(crc32(0, mdata, mdatalen)); | |
122 | else | |
123 | ri->data_crc = cpu_to_je32(0); | |
124 | ||
9fe4854c | 125 | new_metadata = jffs2_write_dnode(c, f, ri, mdata, mdatalen, ALLOC_NORMAL); |
1da177e4 LT |
126 | if (S_ISLNK(inode->i_mode)) |
127 | kfree(mdata); | |
182ec4ee | 128 | |
1da177e4 LT |
129 | if (IS_ERR(new_metadata)) { |
130 | jffs2_complete_reservation(c); | |
131 | jffs2_free_raw_inode(ri); | |
132 | up(&f->sem); | |
133 | return PTR_ERR(new_metadata); | |
134 | } | |
135 | /* It worked. Update the inode */ | |
136 | inode->i_atime = ITIME(je32_to_cpu(ri->atime)); | |
137 | inode->i_ctime = ITIME(je32_to_cpu(ri->ctime)); | |
138 | inode->i_mtime = ITIME(je32_to_cpu(ri->mtime)); | |
139 | inode->i_mode = jemode_to_cpu(ri->mode); | |
140 | inode->i_uid = je16_to_cpu(ri->uid); | |
141 | inode->i_gid = je16_to_cpu(ri->gid); | |
142 | ||
143 | ||
144 | old_metadata = f->metadata; | |
145 | ||
146 | if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size) | |
f302cd02 | 147 | jffs2_truncate_fragtree (c, &f->fragtree, iattr->ia_size); |
1da177e4 LT |
148 | |
149 | if (ivalid & ATTR_SIZE && inode->i_size < iattr->ia_size) { | |
150 | jffs2_add_full_dnode_to_inode(c, f, new_metadata); | |
151 | inode->i_size = iattr->ia_size; | |
152 | f->metadata = NULL; | |
153 | } else { | |
154 | f->metadata = new_metadata; | |
155 | } | |
156 | if (old_metadata) { | |
157 | jffs2_mark_node_obsolete(c, old_metadata->raw); | |
158 | jffs2_free_full_dnode(old_metadata); | |
159 | } | |
160 | jffs2_free_raw_inode(ri); | |
161 | ||
162 | up(&f->sem); | |
163 | jffs2_complete_reservation(c); | |
164 | ||
165 | /* We have to do the vmtruncate() without f->sem held, since | |
182ec4ee | 166 | some pages may be locked and waiting for it in readpage(). |
1da177e4 LT |
167 | We are protected from a simultaneous write() extending i_size |
168 | back past iattr->ia_size, because do_truncate() holds the | |
169 | generic inode semaphore. */ | |
170 | if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size) | |
171 | vmtruncate(inode, iattr->ia_size); | |
172 | ||
173 | return 0; | |
174 | } | |
175 | ||
176 | int jffs2_setattr(struct dentry *dentry, struct iattr *iattr) | |
177 | { | |
aa98d7cf KK |
178 | int rc; |
179 | ||
9ed437c5 DW |
180 | rc = inode_change_ok(dentry->d_inode, iattr); |
181 | if (rc) | |
182 | return rc; | |
183 | ||
aa98d7cf KK |
184 | rc = jffs2_do_setattr(dentry->d_inode, iattr); |
185 | if (!rc && (iattr->ia_valid & ATTR_MODE)) | |
186 | rc = jffs2_acl_chmod(dentry->d_inode); | |
9ed437c5 | 187 | |
aa98d7cf | 188 | return rc; |
1da177e4 LT |
189 | } |
190 | ||
726c3342 | 191 | int jffs2_statfs(struct dentry *dentry, struct kstatfs *buf) |
1da177e4 | 192 | { |
726c3342 | 193 | struct jffs2_sb_info *c = JFFS2_SB_INFO(dentry->d_sb); |
1da177e4 LT |
194 | unsigned long avail; |
195 | ||
196 | buf->f_type = JFFS2_SUPER_MAGIC; | |
197 | buf->f_bsize = 1 << PAGE_SHIFT; | |
198 | buf->f_blocks = c->flash_size >> PAGE_SHIFT; | |
199 | buf->f_files = 0; | |
200 | buf->f_ffree = 0; | |
201 | buf->f_namelen = JFFS2_MAX_NAME_LEN; | |
202 | ||
203 | spin_lock(&c->erase_completion_lock); | |
1da177e4 LT |
204 | avail = c->dirty_size + c->free_size; |
205 | if (avail > c->sector_size * c->resv_blocks_write) | |
206 | avail -= c->sector_size * c->resv_blocks_write; | |
207 | else | |
208 | avail = 0; | |
e0c8e42f | 209 | spin_unlock(&c->erase_completion_lock); |
1da177e4 LT |
210 | |
211 | buf->f_bavail = buf->f_bfree = avail >> PAGE_SHIFT; | |
212 | ||
1da177e4 LT |
213 | return 0; |
214 | } | |
215 | ||
216 | ||
217 | void jffs2_clear_inode (struct inode *inode) | |
218 | { | |
182ec4ee | 219 | /* We can forget about this inode for now - drop all |
1da177e4 LT |
220 | * the nodelists associated with it, etc. |
221 | */ | |
222 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); | |
223 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); | |
182ec4ee | 224 | |
1da177e4 | 225 | D1(printk(KERN_DEBUG "jffs2_clear_inode(): ino #%lu mode %o\n", inode->i_ino, inode->i_mode)); |
1da177e4 LT |
226 | jffs2_do_clear_inode(c, f); |
227 | } | |
228 | ||
229 | void jffs2_read_inode (struct inode *inode) | |
230 | { | |
231 | struct jffs2_inode_info *f; | |
232 | struct jffs2_sb_info *c; | |
233 | struct jffs2_raw_inode latest_node; | |
aef9ab47 DW |
234 | union jffs2_device_node jdev; |
235 | dev_t rdev = 0; | |
1da177e4 LT |
236 | int ret; |
237 | ||
238 | D1(printk(KERN_DEBUG "jffs2_read_inode(): inode->i_ino == %lu\n", inode->i_ino)); | |
239 | ||
240 | f = JFFS2_INODE_INFO(inode); | |
241 | c = JFFS2_SB_INFO(inode->i_sb); | |
242 | ||
243 | jffs2_init_inode_info(f); | |
21eeb7aa | 244 | down(&f->sem); |
182ec4ee | 245 | |
1da177e4 LT |
246 | ret = jffs2_do_read_inode(c, f, inode->i_ino, &latest_node); |
247 | ||
248 | if (ret) { | |
249 | make_bad_inode(inode); | |
250 | up(&f->sem); | |
251 | return; | |
252 | } | |
253 | inode->i_mode = jemode_to_cpu(latest_node.mode); | |
254 | inode->i_uid = je16_to_cpu(latest_node.uid); | |
255 | inode->i_gid = je16_to_cpu(latest_node.gid); | |
256 | inode->i_size = je32_to_cpu(latest_node.isize); | |
257 | inode->i_atime = ITIME(je32_to_cpu(latest_node.atime)); | |
258 | inode->i_mtime = ITIME(je32_to_cpu(latest_node.mtime)); | |
259 | inode->i_ctime = ITIME(je32_to_cpu(latest_node.ctime)); | |
260 | ||
261 | inode->i_nlink = f->inocache->nlink; | |
262 | ||
1da177e4 | 263 | inode->i_blocks = (inode->i_size + 511) >> 9; |
182ec4ee | 264 | |
1da177e4 | 265 | switch (inode->i_mode & S_IFMT) { |
1da177e4 LT |
266 | |
267 | case S_IFLNK: | |
268 | inode->i_op = &jffs2_symlink_inode_operations; | |
269 | break; | |
182ec4ee | 270 | |
1da177e4 LT |
271 | case S_IFDIR: |
272 | { | |
273 | struct jffs2_full_dirent *fd; | |
274 | ||
275 | for (fd=f->dents; fd; fd = fd->next) { | |
276 | if (fd->type == DT_DIR && fd->ino) | |
d8c76e6f | 277 | inc_nlink(inode); |
1da177e4 LT |
278 | } |
279 | /* and '..' */ | |
d8c76e6f | 280 | inc_nlink(inode); |
1da177e4 LT |
281 | /* Root dir gets i_nlink 3 for some reason */ |
282 | if (inode->i_ino == 1) | |
d8c76e6f | 283 | inc_nlink(inode); |
1da177e4 LT |
284 | |
285 | inode->i_op = &jffs2_dir_inode_operations; | |
286 | inode->i_fop = &jffs2_dir_operations; | |
287 | break; | |
288 | } | |
289 | case S_IFREG: | |
290 | inode->i_op = &jffs2_file_inode_operations; | |
291 | inode->i_fop = &jffs2_file_operations; | |
292 | inode->i_mapping->a_ops = &jffs2_file_address_operations; | |
293 | inode->i_mapping->nrpages = 0; | |
294 | break; | |
295 | ||
296 | case S_IFBLK: | |
297 | case S_IFCHR: | |
298 | /* Read the device numbers from the media */ | |
aef9ab47 DW |
299 | if (f->metadata->size != sizeof(jdev.old) && |
300 | f->metadata->size != sizeof(jdev.new)) { | |
301 | printk(KERN_NOTICE "Device node has strange size %d\n", f->metadata->size); | |
302 | up(&f->sem); | |
303 | jffs2_do_clear_inode(c, f); | |
304 | make_bad_inode(inode); | |
305 | return; | |
306 | } | |
1da177e4 | 307 | D1(printk(KERN_DEBUG "Reading device numbers from flash\n")); |
aef9ab47 | 308 | if (jffs2_read_dnode(c, f, f->metadata, (char *)&jdev, 0, f->metadata->size) < 0) { |
1da177e4 LT |
309 | /* Eep */ |
310 | printk(KERN_NOTICE "Read device numbers for inode %lu failed\n", (unsigned long)inode->i_ino); | |
311 | up(&f->sem); | |
312 | jffs2_do_clear_inode(c, f); | |
313 | make_bad_inode(inode); | |
314 | return; | |
182ec4ee | 315 | } |
aef9ab47 DW |
316 | if (f->metadata->size == sizeof(jdev.old)) |
317 | rdev = old_decode_dev(je16_to_cpu(jdev.old)); | |
318 | else | |
319 | rdev = new_decode_dev(je32_to_cpu(jdev.new)); | |
1da177e4 LT |
320 | |
321 | case S_IFSOCK: | |
322 | case S_IFIFO: | |
323 | inode->i_op = &jffs2_file_inode_operations; | |
aef9ab47 | 324 | init_special_inode(inode, inode->i_mode, rdev); |
1da177e4 LT |
325 | break; |
326 | ||
327 | default: | |
328 | printk(KERN_WARNING "jffs2_read_inode(): Bogus imode %o for ino %lu\n", inode->i_mode, (unsigned long)inode->i_ino); | |
329 | } | |
330 | ||
331 | up(&f->sem); | |
332 | ||
333 | D1(printk(KERN_DEBUG "jffs2_read_inode() returning\n")); | |
334 | } | |
335 | ||
336 | void jffs2_dirty_inode(struct inode *inode) | |
337 | { | |
338 | struct iattr iattr; | |
339 | ||
340 | if (!(inode->i_state & I_DIRTY_DATASYNC)) { | |
341 | D2(printk(KERN_DEBUG "jffs2_dirty_inode() not calling setattr() for ino #%lu\n", inode->i_ino)); | |
342 | return; | |
343 | } | |
344 | ||
345 | D1(printk(KERN_DEBUG "jffs2_dirty_inode() calling setattr() for ino #%lu\n", inode->i_ino)); | |
346 | ||
347 | iattr.ia_valid = ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_MTIME|ATTR_CTIME; | |
348 | iattr.ia_mode = inode->i_mode; | |
349 | iattr.ia_uid = inode->i_uid; | |
350 | iattr.ia_gid = inode->i_gid; | |
351 | iattr.ia_atime = inode->i_atime; | |
352 | iattr.ia_mtime = inode->i_mtime; | |
353 | iattr.ia_ctime = inode->i_ctime; | |
354 | ||
355 | jffs2_do_setattr(inode, &iattr); | |
356 | } | |
357 | ||
358 | int jffs2_remount_fs (struct super_block *sb, int *flags, char *data) | |
359 | { | |
360 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
361 | ||
362 | if (c->flags & JFFS2_SB_FLAG_RO && !(sb->s_flags & MS_RDONLY)) | |
363 | return -EROFS; | |
364 | ||
365 | /* We stop if it was running, then restart if it needs to. | |
366 | This also catches the case where it was stopped and this | |
367 | is just a remount to restart it. | |
368 | Flush the writebuffer, if neccecary, else we loose it */ | |
369 | if (!(sb->s_flags & MS_RDONLY)) { | |
370 | jffs2_stop_garbage_collect_thread(c); | |
371 | down(&c->alloc_sem); | |
372 | jffs2_flush_wbuf_pad(c); | |
373 | up(&c->alloc_sem); | |
182ec4ee | 374 | } |
1da177e4 LT |
375 | |
376 | if (!(*flags & MS_RDONLY)) | |
377 | jffs2_start_garbage_collect_thread(c); | |
182ec4ee | 378 | |
1da177e4 LT |
379 | *flags |= MS_NOATIME; |
380 | ||
381 | return 0; | |
382 | } | |
383 | ||
384 | void jffs2_write_super (struct super_block *sb) | |
385 | { | |
386 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); | |
387 | sb->s_dirt = 0; | |
388 | ||
389 | if (sb->s_flags & MS_RDONLY) | |
390 | return; | |
391 | ||
392 | D1(printk(KERN_DEBUG "jffs2_write_super()\n")); | |
393 | jffs2_garbage_collect_trigger(c); | |
394 | jffs2_erase_pending_blocks(c, 0); | |
395 | jffs2_flush_wbuf_gc(c, 0); | |
396 | } | |
397 | ||
398 | ||
399 | /* jffs2_new_inode: allocate a new inode and inocache, add it to the hash, | |
400 | fill in the raw_inode while you're at it. */ | |
cfc8dc6f | 401 | struct inode *jffs2_new_inode (struct inode *dir_i, int mode, struct jffs2_raw_inode *ri) |
1da177e4 LT |
402 | { |
403 | struct inode *inode; | |
404 | struct super_block *sb = dir_i->i_sb; | |
405 | struct jffs2_sb_info *c; | |
406 | struct jffs2_inode_info *f; | |
407 | int ret; | |
408 | ||
409 | D1(printk(KERN_DEBUG "jffs2_new_inode(): dir_i %ld, mode 0x%x\n", dir_i->i_ino, mode)); | |
410 | ||
411 | c = JFFS2_SB_INFO(sb); | |
182ec4ee | 412 | |
1da177e4 | 413 | inode = new_inode(sb); |
182ec4ee | 414 | |
1da177e4 LT |
415 | if (!inode) |
416 | return ERR_PTR(-ENOMEM); | |
417 | ||
418 | f = JFFS2_INODE_INFO(inode); | |
419 | jffs2_init_inode_info(f); | |
21eeb7aa | 420 | down(&f->sem); |
1da177e4 LT |
421 | |
422 | memset(ri, 0, sizeof(*ri)); | |
423 | /* Set OS-specific defaults for new inodes */ | |
424 | ri->uid = cpu_to_je16(current->fsuid); | |
425 | ||
426 | if (dir_i->i_mode & S_ISGID) { | |
427 | ri->gid = cpu_to_je16(dir_i->i_gid); | |
428 | if (S_ISDIR(mode)) | |
429 | mode |= S_ISGID; | |
430 | } else { | |
431 | ri->gid = cpu_to_je16(current->fsgid); | |
432 | } | |
9ed437c5 DW |
433 | |
434 | /* POSIX ACLs have to be processed now, at least partly. | |
435 | The umask is only applied if there's no default ACL */ | |
cfc8dc6f KK |
436 | ret = jffs2_init_acl_pre(dir_i, inode, &mode); |
437 | if (ret) { | |
438 | make_bad_inode(inode); | |
439 | iput(inode); | |
440 | return ERR_PTR(ret); | |
9ed437c5 | 441 | } |
1da177e4 LT |
442 | ret = jffs2_do_new_inode (c, f, mode, ri); |
443 | if (ret) { | |
444 | make_bad_inode(inode); | |
445 | iput(inode); | |
446 | return ERR_PTR(ret); | |
447 | } | |
448 | inode->i_nlink = 1; | |
449 | inode->i_ino = je32_to_cpu(ri->ino); | |
450 | inode->i_mode = jemode_to_cpu(ri->mode); | |
451 | inode->i_gid = je16_to_cpu(ri->gid); | |
452 | inode->i_uid = je16_to_cpu(ri->uid); | |
453 | inode->i_atime = inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC; | |
454 | ri->atime = ri->mtime = ri->ctime = cpu_to_je32(I_SEC(inode->i_mtime)); | |
455 | ||
1da177e4 LT |
456 | inode->i_blocks = 0; |
457 | inode->i_size = 0; | |
458 | ||
459 | insert_inode_hash(inode); | |
460 | ||
461 | return inode; | |
462 | } | |
463 | ||
464 | ||
465 | int jffs2_do_fill_super(struct super_block *sb, void *data, int silent) | |
466 | { | |
467 | struct jffs2_sb_info *c; | |
468 | struct inode *root_i; | |
469 | int ret; | |
470 | size_t blocks; | |
471 | ||
472 | c = JFFS2_SB_INFO(sb); | |
473 | ||
2f82ce1e | 474 | #ifndef CONFIG_JFFS2_FS_WRITEBUFFER |
1da177e4 LT |
475 | if (c->mtd->type == MTD_NANDFLASH) { |
476 | printk(KERN_ERR "jffs2: Cannot operate on NAND flash unless jffs2 NAND support is compiled in.\n"); | |
477 | return -EINVAL; | |
478 | } | |
8f15fd55 AV |
479 | if (c->mtd->type == MTD_DATAFLASH) { |
480 | printk(KERN_ERR "jffs2: Cannot operate on DataFlash unless jffs2 DataFlash support is compiled in.\n"); | |
481 | return -EINVAL; | |
482 | } | |
483 | #endif | |
1da177e4 LT |
484 | |
485 | c->flash_size = c->mtd->size; | |
182ec4ee | 486 | c->sector_size = c->mtd->erasesize; |
1da177e4 | 487 | blocks = c->flash_size / c->sector_size; |
1da177e4 LT |
488 | |
489 | /* | |
490 | * Size alignment check | |
491 | */ | |
492 | if ((c->sector_size * blocks) != c->flash_size) { | |
182ec4ee | 493 | c->flash_size = c->sector_size * blocks; |
1da177e4 LT |
494 | printk(KERN_INFO "jffs2: Flash size not aligned to erasesize, reducing to %dKiB\n", |
495 | c->flash_size / 1024); | |
496 | } | |
497 | ||
1da177e4 LT |
498 | if (c->flash_size < 5*c->sector_size) { |
499 | printk(KERN_ERR "jffs2: Too few erase blocks (%d)\n", c->flash_size / c->sector_size); | |
500 | return -EINVAL; | |
501 | } | |
502 | ||
503 | c->cleanmarker_size = sizeof(struct jffs2_unknown_node); | |
1da177e4 LT |
504 | |
505 | /* NAND (or other bizarre) flash... do setup accordingly */ | |
506 | ret = jffs2_flash_setup(c); | |
507 | if (ret) | |
508 | return ret; | |
509 | ||
3d375d9e | 510 | c->inocache_list = kcalloc(INOCACHE_HASHSIZE, sizeof(struct jffs2_inode_cache *), GFP_KERNEL); |
1da177e4 LT |
511 | if (!c->inocache_list) { |
512 | ret = -ENOMEM; | |
513 | goto out_wbuf; | |
514 | } | |
1da177e4 | 515 | |
aa98d7cf KK |
516 | jffs2_init_xattr_subsystem(c); |
517 | ||
1da177e4 LT |
518 | if ((ret = jffs2_do_mount_fs(c))) |
519 | goto out_inohash; | |
520 | ||
521 | ret = -EINVAL; | |
522 | ||
523 | D1(printk(KERN_DEBUG "jffs2_do_fill_super(): Getting root inode\n")); | |
524 | root_i = iget(sb, 1); | |
525 | if (is_bad_inode(root_i)) { | |
526 | D1(printk(KERN_WARNING "get root inode failed\n")); | |
6dac02a5 | 527 | goto out_root_i; |
1da177e4 LT |
528 | } |
529 | ||
530 | D1(printk(KERN_DEBUG "jffs2_do_fill_super(): d_alloc_root()\n")); | |
531 | sb->s_root = d_alloc_root(root_i); | |
532 | if (!sb->s_root) | |
533 | goto out_root_i; | |
534 | ||
1da177e4 | 535 | sb->s_maxbytes = 0xFFFFFFFF; |
1da177e4 LT |
536 | sb->s_blocksize = PAGE_CACHE_SIZE; |
537 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; | |
538 | sb->s_magic = JFFS2_SUPER_MAGIC; | |
539 | if (!(sb->s_flags & MS_RDONLY)) | |
540 | jffs2_start_garbage_collect_thread(c); | |
541 | return 0; | |
542 | ||
543 | out_root_i: | |
544 | iput(root_i); | |
1da177e4 LT |
545 | jffs2_free_ino_caches(c); |
546 | jffs2_free_raw_node_refs(c); | |
4ce1f562 | 547 | if (jffs2_blocks_use_vmalloc(c)) |
1da177e4 LT |
548 | vfree(c->blocks); |
549 | else | |
550 | kfree(c->blocks); | |
551 | out_inohash: | |
aa98d7cf | 552 | jffs2_clear_xattr_subsystem(c); |
1da177e4 LT |
553 | kfree(c->inocache_list); |
554 | out_wbuf: | |
555 | jffs2_flash_cleanup(c); | |
556 | ||
557 | return ret; | |
558 | } | |
559 | ||
560 | void jffs2_gc_release_inode(struct jffs2_sb_info *c, | |
561 | struct jffs2_inode_info *f) | |
562 | { | |
563 | iput(OFNI_EDONI_2SFFJ(f)); | |
564 | } | |
565 | ||
566 | struct jffs2_inode_info *jffs2_gc_fetch_inode(struct jffs2_sb_info *c, | |
567 | int inum, int nlink) | |
568 | { | |
569 | struct inode *inode; | |
570 | struct jffs2_inode_cache *ic; | |
571 | if (!nlink) { | |
572 | /* The inode has zero nlink but its nodes weren't yet marked | |
182ec4ee | 573 | obsolete. This has to be because we're still waiting for |
1da177e4 LT |
574 | the final (close() and) iput() to happen. |
575 | ||
182ec4ee | 576 | There's a possibility that the final iput() could have |
1da177e4 LT |
577 | happened while we were contemplating. In order to ensure |
578 | that we don't cause a new read_inode() (which would fail) | |
579 | for the inode in question, we use ilookup() in this case | |
580 | instead of iget(). | |
581 | ||
182ec4ee | 582 | The nlink can't _become_ zero at this point because we're |
1da177e4 LT |
583 | holding the alloc_sem, and jffs2_do_unlink() would also |
584 | need that while decrementing nlink on any inode. | |
585 | */ | |
586 | inode = ilookup(OFNI_BS_2SFFJ(c), inum); | |
587 | if (!inode) { | |
588 | D1(printk(KERN_DEBUG "ilookup() failed for ino #%u; inode is probably deleted.\n", | |
589 | inum)); | |
590 | ||
591 | spin_lock(&c->inocache_lock); | |
592 | ic = jffs2_get_ino_cache(c, inum); | |
593 | if (!ic) { | |
594 | D1(printk(KERN_DEBUG "Inode cache for ino #%u is gone.\n", inum)); | |
595 | spin_unlock(&c->inocache_lock); | |
596 | return NULL; | |
597 | } | |
598 | if (ic->state != INO_STATE_CHECKEDABSENT) { | |
599 | /* Wait for progress. Don't just loop */ | |
600 | D1(printk(KERN_DEBUG "Waiting for ino #%u in state %d\n", | |
601 | ic->ino, ic->state)); | |
602 | sleep_on_spinunlock(&c->inocache_wq, &c->inocache_lock); | |
603 | } else { | |
604 | spin_unlock(&c->inocache_lock); | |
605 | } | |
606 | ||
607 | return NULL; | |
608 | } | |
609 | } else { | |
610 | /* Inode has links to it still; they're not going away because | |
611 | jffs2_do_unlink() would need the alloc_sem and we have it. | |
612 | Just iget() it, and if read_inode() is necessary that's OK. | |
613 | */ | |
614 | inode = iget(OFNI_BS_2SFFJ(c), inum); | |
615 | if (!inode) | |
616 | return ERR_PTR(-ENOMEM); | |
617 | } | |
618 | if (is_bad_inode(inode)) { | |
619 | printk(KERN_NOTICE "Eep. read_inode() failed for ino #%u. nlink %d\n", | |
620 | inum, nlink); | |
621 | /* NB. This will happen again. We need to do something appropriate here. */ | |
622 | iput(inode); | |
623 | return ERR_PTR(-EIO); | |
624 | } | |
625 | ||
626 | return JFFS2_INODE_INFO(inode); | |
627 | } | |
628 | ||
182ec4ee TG |
629 | unsigned char *jffs2_gc_fetch_page(struct jffs2_sb_info *c, |
630 | struct jffs2_inode_info *f, | |
1da177e4 LT |
631 | unsigned long offset, |
632 | unsigned long *priv) | |
633 | { | |
634 | struct inode *inode = OFNI_EDONI_2SFFJ(f); | |
635 | struct page *pg; | |
636 | ||
fc0e0197 | 637 | pg = read_cache_page_async(inode->i_mapping, offset >> PAGE_CACHE_SHIFT, |
1da177e4 LT |
638 | (void *)jffs2_do_readpage_unlock, inode); |
639 | if (IS_ERR(pg)) | |
640 | return (void *)pg; | |
182ec4ee | 641 | |
1da177e4 LT |
642 | *priv = (unsigned long)pg; |
643 | return kmap(pg); | |
644 | } | |
645 | ||
646 | void jffs2_gc_release_page(struct jffs2_sb_info *c, | |
647 | unsigned char *ptr, | |
648 | unsigned long *priv) | |
649 | { | |
650 | struct page *pg = (void *)*priv; | |
651 | ||
652 | kunmap(pg); | |
653 | page_cache_release(pg); | |
654 | } | |
655 | ||
656 | static int jffs2_flash_setup(struct jffs2_sb_info *c) { | |
657 | int ret = 0; | |
182ec4ee | 658 | |
1da177e4 LT |
659 | if (jffs2_cleanmarker_oob(c)) { |
660 | /* NAND flash... do setup accordingly */ | |
661 | ret = jffs2_nand_flash_setup(c); | |
662 | if (ret) | |
663 | return ret; | |
664 | } | |
665 | ||
8f15fd55 AV |
666 | /* and Dataflash */ |
667 | if (jffs2_dataflash(c)) { | |
668 | ret = jffs2_dataflash_setup(c); | |
669 | if (ret) | |
670 | return ret; | |
671 | } | |
59da721a NP |
672 | |
673 | /* and Intel "Sibley" flash */ | |
674 | if (jffs2_nor_wbuf_flash(c)) { | |
675 | ret = jffs2_nor_wbuf_flash_setup(c); | |
676 | if (ret) | |
677 | return ret; | |
678 | } | |
679 | ||
0029da3b AB |
680 | /* and an UBI volume */ |
681 | if (jffs2_ubivol(c)) { | |
682 | ret = jffs2_ubivol_setup(c); | |
683 | if (ret) | |
684 | return ret; | |
685 | } | |
686 | ||
1da177e4 LT |
687 | return ret; |
688 | } | |
689 | ||
690 | void jffs2_flash_cleanup(struct jffs2_sb_info *c) { | |
691 | ||
692 | if (jffs2_cleanmarker_oob(c)) { | |
693 | jffs2_nand_flash_cleanup(c); | |
694 | } | |
695 | ||
8f15fd55 AV |
696 | /* and DataFlash */ |
697 | if (jffs2_dataflash(c)) { | |
698 | jffs2_dataflash_cleanup(c); | |
699 | } | |
59da721a NP |
700 | |
701 | /* and Intel "Sibley" flash */ | |
702 | if (jffs2_nor_wbuf_flash(c)) { | |
703 | jffs2_nor_wbuf_flash_cleanup(c); | |
704 | } | |
0029da3b AB |
705 | |
706 | /* and an UBI volume */ | |
707 | if (jffs2_ubivol(c)) { | |
708 | jffs2_ubivol_cleanup(c); | |
709 | } | |
1da177e4 | 710 | } |