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1 | /* |
2 | * JFFS2 -- Journalling Flash File System, Version 2. |
3 | * |
4 | * Copyright © 2001-2007 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 | * |
10 | */ |
11 | |
12 | #include <linux/capability.h> |
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 <linux/smp_lock.h> |
24 | #include "nodelist.h" |
25 | |
26 | static int jffs2_flash_setup(struct jffs2_sb_info *c); |
27 | |
28 | int jffs2_do_setattr (struct inode *inode, struct iattr *iattr) |
29 | { |
30 | struct jffs2_full_dnode *old_metadata, *new_metadata; |
31 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); |
32 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); |
33 | struct jffs2_raw_inode *ri; |
34 | union jffs2_device_node dev; |
35 | unsigned char *mdata = NULL; |
36 | int mdatalen = 0; |
37 | unsigned int ivalid; |
38 | uint32_t alloclen; |
39 | int ret; |
40 | int alloc_type = ALLOC_NORMAL; |
41 | |
42 | D1(printk(KERN_DEBUG "jffs2_setattr(): ino #%lu\n", inode->i_ino)); |
43 | |
44 | /* Special cases - we don't want more than one data node |
45 | for these types on the medium at any time. So setattr |
46 | must read the original data associated with the node |
47 | (i.e. the device numbers or the target name) and write |
48 | it out again with the appropriate data attached */ |
49 | if (S_ISBLK(inode->i_mode) || S_ISCHR(inode->i_mode)) { |
50 | /* For these, we don't actually need to read the old node */ |
51 | mdatalen = jffs2_encode_dev(&dev, inode->i_rdev); |
52 | mdata = (char *)&dev; |
53 | D1(printk(KERN_DEBUG "jffs2_setattr(): Writing %d bytes of kdev_t\n", mdatalen)); |
54 | } else if (S_ISLNK(inode->i_mode)) { |
55 | mutex_lock(&f->sem); |
56 | mdatalen = f->metadata->size; |
57 | mdata = kmalloc(f->metadata->size, GFP_USER); |
58 | if (!mdata) { |
59 | mutex_unlock(&f->sem); |
60 | return -ENOMEM; |
61 | } |
62 | ret = jffs2_read_dnode(c, f, f->metadata, mdata, 0, mdatalen); |
63 | if (ret) { |
64 | mutex_unlock(&f->sem); |
65 | kfree(mdata); |
66 | return ret; |
67 | } |
68 | mutex_unlock(&f->sem); |
69 | D1(printk(KERN_DEBUG "jffs2_setattr(): Writing %d bytes of symlink target\n", mdatalen)); |
70 | } |
71 | |
72 | ri = jffs2_alloc_raw_inode(); |
73 | if (!ri) { |
74 | if (S_ISLNK(inode->i_mode)) |
75 | kfree(mdata); |
76 | return -ENOMEM; |
77 | } |
78 | |
79 | ret = jffs2_reserve_space(c, sizeof(*ri) + mdatalen, &alloclen, |
80 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); |
81 | if (ret) { |
82 | jffs2_free_raw_inode(ri); |
83 | if (S_ISLNK(inode->i_mode & S_IFMT)) |
84 | kfree(mdata); |
85 | return ret; |
86 | } |
87 | mutex_lock(&f->sem); |
88 | ivalid = iattr->ia_valid; |
89 | |
90 | ri->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); |
91 | ri->nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE); |
92 | ri->totlen = cpu_to_je32(sizeof(*ri) + mdatalen); |
93 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); |
94 | |
95 | ri->ino = cpu_to_je32(inode->i_ino); |
96 | ri->version = cpu_to_je32(++f->highest_version); |
97 | |
98 | ri->uid = cpu_to_je16((ivalid & ATTR_UID)?iattr->ia_uid:inode->i_uid); |
99 | ri->gid = cpu_to_je16((ivalid & ATTR_GID)?iattr->ia_gid:inode->i_gid); |
100 | |
101 | if (ivalid & ATTR_MODE) |
102 | ri->mode = cpu_to_jemode(iattr->ia_mode); |
103 | else |
104 | ri->mode = cpu_to_jemode(inode->i_mode); |
105 | |
106 | |
107 | ri->isize = cpu_to_je32((ivalid & ATTR_SIZE)?iattr->ia_size:inode->i_size); |
108 | ri->atime = cpu_to_je32(I_SEC((ivalid & ATTR_ATIME)?iattr->ia_atime:inode->i_atime)); |
109 | ri->mtime = cpu_to_je32(I_SEC((ivalid & ATTR_MTIME)?iattr->ia_mtime:inode->i_mtime)); |
110 | ri->ctime = cpu_to_je32(I_SEC((ivalid & ATTR_CTIME)?iattr->ia_ctime:inode->i_ctime)); |
111 | |
112 | ri->offset = cpu_to_je32(0); |
113 | ri->csize = ri->dsize = cpu_to_je32(mdatalen); |
114 | ri->compr = JFFS2_COMPR_NONE; |
115 | if (ivalid & ATTR_SIZE && inode->i_size < iattr->ia_size) { |
116 | /* It's an extension. Make it a hole node */ |
117 | ri->compr = JFFS2_COMPR_ZERO; |
118 | ri->dsize = cpu_to_je32(iattr->ia_size - inode->i_size); |
119 | ri->offset = cpu_to_je32(inode->i_size); |
120 | } else if (ivalid & ATTR_SIZE && !iattr->ia_size) { |
121 | /* For truncate-to-zero, treat it as deletion because |
122 | it'll always be obsoleting all previous nodes */ |
123 | alloc_type = ALLOC_DELETION; |
124 | } |
125 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); |
126 | if (mdatalen) |
127 | ri->data_crc = cpu_to_je32(crc32(0, mdata, mdatalen)); |
128 | else |
129 | ri->data_crc = cpu_to_je32(0); |
130 | |
131 | new_metadata = jffs2_write_dnode(c, f, ri, mdata, mdatalen, alloc_type); |
132 | if (S_ISLNK(inode->i_mode)) |
133 | kfree(mdata); |
134 | |
135 | if (IS_ERR(new_metadata)) { |
136 | jffs2_complete_reservation(c); |
137 | jffs2_free_raw_inode(ri); |
138 | mutex_unlock(&f->sem); |
139 | return PTR_ERR(new_metadata); |
140 | } |
141 | /* It worked. Update the inode */ |
142 | inode->i_atime = ITIME(je32_to_cpu(ri->atime)); |
143 | inode->i_ctime = ITIME(je32_to_cpu(ri->ctime)); |
144 | inode->i_mtime = ITIME(je32_to_cpu(ri->mtime)); |
145 | inode->i_mode = jemode_to_cpu(ri->mode); |
146 | inode->i_uid = je16_to_cpu(ri->uid); |
147 | inode->i_gid = je16_to_cpu(ri->gid); |
148 | |
149 | |
150 | old_metadata = f->metadata; |
151 | |
152 | if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size) |
153 | jffs2_truncate_fragtree (c, &f->fragtree, iattr->ia_size); |
154 | |
155 | if (ivalid & ATTR_SIZE && inode->i_size < iattr->ia_size) { |
156 | jffs2_add_full_dnode_to_inode(c, f, new_metadata); |
157 | inode->i_size = iattr->ia_size; |
158 | inode->i_blocks = (inode->i_size + 511) >> 9; |
159 | f->metadata = NULL; |
160 | } else { |
161 | f->metadata = new_metadata; |
162 | } |
163 | if (old_metadata) { |
164 | jffs2_mark_node_obsolete(c, old_metadata->raw); |
165 | jffs2_free_full_dnode(old_metadata); |
166 | } |
167 | jffs2_free_raw_inode(ri); |
168 | |
169 | mutex_unlock(&f->sem); |
170 | jffs2_complete_reservation(c); |
171 | |
172 | /* We have to do the vmtruncate() without f->sem held, since |
173 | some pages may be locked and waiting for it in readpage(). |
174 | We are protected from a simultaneous write() extending i_size |
175 | back past iattr->ia_size, because do_truncate() holds the |
176 | generic inode semaphore. */ |
177 | if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size) { |
178 | vmtruncate(inode, iattr->ia_size); |
179 | inode->i_blocks = (inode->i_size + 511) >> 9; |
180 | } |
181 | |
182 | return 0; |
183 | } |
184 | |
185 | int jffs2_setattr(struct dentry *dentry, struct iattr *iattr) |
186 | { |
187 | int rc; |
188 | |
189 | rc = inode_change_ok(dentry->d_inode, iattr); |
190 | if (rc) |
191 | return rc; |
192 | |
193 | rc = jffs2_do_setattr(dentry->d_inode, iattr); |
194 | if (!rc && (iattr->ia_valid & ATTR_MODE)) |
195 | rc = jffs2_acl_chmod(dentry->d_inode); |
196 | |
197 | return rc; |
198 | } |
199 | |
200 | int jffs2_statfs(struct dentry *dentry, struct kstatfs *buf) |
201 | { |
202 | struct jffs2_sb_info *c = JFFS2_SB_INFO(dentry->d_sb); |
203 | unsigned long avail; |
204 | |
205 | buf->f_type = JFFS2_SUPER_MAGIC; |
206 | buf->f_bsize = 1 << PAGE_SHIFT; |
207 | buf->f_blocks = c->flash_size >> PAGE_SHIFT; |
208 | buf->f_files = 0; |
209 | buf->f_ffree = 0; |
210 | buf->f_namelen = JFFS2_MAX_NAME_LEN; |
211 | buf->f_fsid.val[0] = JFFS2_SUPER_MAGIC; |
212 | buf->f_fsid.val[1] = c->mtd->index; |
213 | |
214 | spin_lock(&c->erase_completion_lock); |
215 | avail = c->dirty_size + c->free_size; |
216 | if (avail > c->sector_size * c->resv_blocks_write) |
217 | avail -= c->sector_size * c->resv_blocks_write; |
218 | else |
219 | avail = 0; |
220 | spin_unlock(&c->erase_completion_lock); |
221 | |
222 | buf->f_bavail = buf->f_bfree = avail >> PAGE_SHIFT; |
223 | |
224 | return 0; |
225 | } |
226 | |
227 | |
228 | void jffs2_clear_inode (struct inode *inode) |
229 | { |
230 | /* We can forget about this inode for now - drop all |
231 | * the nodelists associated with it, etc. |
232 | */ |
233 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); |
234 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); |
235 | |
236 | D1(printk(KERN_DEBUG "jffs2_clear_inode(): ino #%lu mode %o\n", inode->i_ino, inode->i_mode)); |
237 | jffs2_do_clear_inode(c, f); |
238 | } |
239 | |
240 | struct inode *jffs2_iget(struct super_block *sb, unsigned long ino) |
241 | { |
242 | struct jffs2_inode_info *f; |
243 | struct jffs2_sb_info *c; |
244 | struct jffs2_raw_inode latest_node; |
245 | union jffs2_device_node jdev; |
246 | struct inode *inode; |
247 | dev_t rdev = 0; |
248 | int ret; |
249 | |
250 | D1(printk(KERN_DEBUG "jffs2_iget(): ino == %lu\n", ino)); |
251 | |
252 | inode = iget_locked(sb, ino); |
253 | if (!inode) |
254 | return ERR_PTR(-ENOMEM); |
255 | if (!(inode->i_state & I_NEW)) |
256 | return inode; |
257 | |
258 | f = JFFS2_INODE_INFO(inode); |
259 | c = JFFS2_SB_INFO(inode->i_sb); |
260 | |
261 | jffs2_init_inode_info(f); |
262 | mutex_lock(&f->sem); |
263 | |
264 | ret = jffs2_do_read_inode(c, f, inode->i_ino, &latest_node); |
265 | |
266 | if (ret) { |
267 | mutex_unlock(&f->sem); |
268 | iget_failed(inode); |
269 | return ERR_PTR(ret); |
270 | } |
271 | inode->i_mode = jemode_to_cpu(latest_node.mode); |
272 | inode->i_uid = je16_to_cpu(latest_node.uid); |
273 | inode->i_gid = je16_to_cpu(latest_node.gid); |
274 | inode->i_size = je32_to_cpu(latest_node.isize); |
275 | inode->i_atime = ITIME(je32_to_cpu(latest_node.atime)); |
276 | inode->i_mtime = ITIME(je32_to_cpu(latest_node.mtime)); |
277 | inode->i_ctime = ITIME(je32_to_cpu(latest_node.ctime)); |
278 | |
279 | inode->i_nlink = f->inocache->pino_nlink; |
280 | |
281 | inode->i_blocks = (inode->i_size + 511) >> 9; |
282 | |
283 | switch (inode->i_mode & S_IFMT) { |
284 | |
285 | case S_IFLNK: |
286 | inode->i_op = &jffs2_symlink_inode_operations; |
287 | break; |
288 | |
289 | case S_IFDIR: |
290 | { |
291 | struct jffs2_full_dirent *fd; |
292 | inode->i_nlink = 2; /* parent and '.' */ |
293 | |
294 | for (fd=f->dents; fd; fd = fd->next) { |
295 | if (fd->type == DT_DIR && fd->ino) |
296 | inc_nlink(inode); |
297 | } |
298 | /* Root dir gets i_nlink 3 for some reason */ |
299 | if (inode->i_ino == 1) |
300 | inc_nlink(inode); |
301 | |
302 | inode->i_op = &jffs2_dir_inode_operations; |
303 | inode->i_fop = &jffs2_dir_operations; |
304 | break; |
305 | } |
306 | case S_IFREG: |
307 | inode->i_op = &jffs2_file_inode_operations; |
308 | inode->i_fop = &jffs2_file_operations; |
309 | inode->i_mapping->a_ops = &jffs2_file_address_operations; |
310 | inode->i_mapping->nrpages = 0; |
311 | break; |
312 | |
313 | case S_IFBLK: |
314 | case S_IFCHR: |
315 | /* Read the device numbers from the media */ |
316 | if (f->metadata->size != sizeof(jdev.old) && |
317 | f->metadata->size != sizeof(jdev.new)) { |
318 | printk(KERN_NOTICE "Device node has strange size %d\n", f->metadata->size); |
319 | goto error_io; |
320 | } |
321 | D1(printk(KERN_DEBUG "Reading device numbers from flash\n")); |
322 | ret = jffs2_read_dnode(c, f, f->metadata, (char *)&jdev, 0, f->metadata->size); |
323 | if (ret < 0) { |
324 | /* Eep */ |
325 | printk(KERN_NOTICE "Read device numbers for inode %lu failed\n", (unsigned long)inode->i_ino); |
326 | goto error; |
327 | } |
328 | if (f->metadata->size == sizeof(jdev.old)) |
329 | rdev = old_decode_dev(je16_to_cpu(jdev.old)); |
330 | else |
331 | rdev = new_decode_dev(je32_to_cpu(jdev.new)); |
332 | |
333 | case S_IFSOCK: |
334 | case S_IFIFO: |
335 | inode->i_op = &jffs2_file_inode_operations; |
336 | init_special_inode(inode, inode->i_mode, rdev); |
337 | break; |
338 | |
339 | default: |
340 | printk(KERN_WARNING "jffs2_read_inode(): Bogus imode %o for ino %lu\n", inode->i_mode, (unsigned long)inode->i_ino); |
341 | } |
342 | |
343 | mutex_unlock(&f->sem); |
344 | |
345 | D1(printk(KERN_DEBUG "jffs2_read_inode() returning\n")); |
346 | unlock_new_inode(inode); |
347 | return inode; |
348 | |
349 | error_io: |
350 | ret = -EIO; |
351 | error: |
352 | mutex_unlock(&f->sem); |
353 | jffs2_do_clear_inode(c, f); |
354 | iget_failed(inode); |
355 | return ERR_PTR(ret); |
356 | } |
357 | |
358 | void jffs2_dirty_inode(struct inode *inode) |
359 | { |
360 | struct iattr iattr; |
361 | |
362 | if (!(inode->i_state & I_DIRTY_DATASYNC)) { |
363 | D2(printk(KERN_DEBUG "jffs2_dirty_inode() not calling setattr() for ino #%lu\n", inode->i_ino)); |
364 | return; |
365 | } |
366 | |
367 | D1(printk(KERN_DEBUG "jffs2_dirty_inode() calling setattr() for ino #%lu\n", inode->i_ino)); |
368 | |
369 | iattr.ia_valid = ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_MTIME|ATTR_CTIME; |
370 | iattr.ia_mode = inode->i_mode; |
371 | iattr.ia_uid = inode->i_uid; |
372 | iattr.ia_gid = inode->i_gid; |
373 | iattr.ia_atime = inode->i_atime; |
374 | iattr.ia_mtime = inode->i_mtime; |
375 | iattr.ia_ctime = inode->i_ctime; |
376 | |
377 | jffs2_do_setattr(inode, &iattr); |
378 | } |
379 | |
380 | int jffs2_remount_fs (struct super_block *sb, int *flags, char *data) |
381 | { |
382 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); |
383 | |
384 | if (c->flags & JFFS2_SB_FLAG_RO && !(sb->s_flags & MS_RDONLY)) |
385 | return -EROFS; |
386 | |
387 | /* We stop if it was running, then restart if it needs to. |
388 | This also catches the case where it was stopped and this |
389 | is just a remount to restart it. |
390 | Flush the writebuffer, if neccecary, else we loose it */ |
391 | lock_kernel(); |
392 | if (!(sb->s_flags & MS_RDONLY)) { |
393 | jffs2_stop_garbage_collect_thread(c); |
394 | mutex_lock(&c->alloc_sem); |
395 | jffs2_flush_wbuf_pad(c); |
396 | mutex_unlock(&c->alloc_sem); |
397 | } |
398 | |
399 | if (!(*flags & MS_RDONLY)) |
400 | jffs2_start_garbage_collect_thread(c); |
401 | |
402 | *flags |= MS_NOATIME; |
403 | |
404 | unlock_kernel(); |
405 | return 0; |
406 | } |
407 | |
408 | /* jffs2_new_inode: allocate a new inode and inocache, add it to the hash, |
409 | fill in the raw_inode while you're at it. */ |
410 | struct inode *jffs2_new_inode (struct inode *dir_i, int mode, struct jffs2_raw_inode *ri) |
411 | { |
412 | struct inode *inode; |
413 | struct super_block *sb = dir_i->i_sb; |
414 | struct jffs2_sb_info *c; |
415 | struct jffs2_inode_info *f; |
416 | int ret; |
417 | |
418 | D1(printk(KERN_DEBUG "jffs2_new_inode(): dir_i %ld, mode 0x%x\n", dir_i->i_ino, mode)); |
419 | |
420 | c = JFFS2_SB_INFO(sb); |
421 | |
422 | inode = new_inode(sb); |
423 | |
424 | if (!inode) |
425 | return ERR_PTR(-ENOMEM); |
426 | |
427 | f = JFFS2_INODE_INFO(inode); |
428 | jffs2_init_inode_info(f); |
429 | mutex_lock(&f->sem); |
430 | |
431 | memset(ri, 0, sizeof(*ri)); |
432 | /* Set OS-specific defaults for new inodes */ |
433 | ri->uid = cpu_to_je16(current_fsuid()); |
434 | |
435 | if (dir_i->i_mode & S_ISGID) { |
436 | ri->gid = cpu_to_je16(dir_i->i_gid); |
437 | if (S_ISDIR(mode)) |
438 | mode |= S_ISGID; |
439 | } else { |
440 | ri->gid = cpu_to_je16(current_fsgid()); |
441 | } |
442 | |
443 | /* POSIX ACLs have to be processed now, at least partly. |
444 | The umask is only applied if there's no default ACL */ |
445 | ret = jffs2_init_acl_pre(dir_i, inode, &mode); |
446 | if (ret) { |
447 | make_bad_inode(inode); |
448 | iput(inode); |
449 | return ERR_PTR(ret); |
450 | } |
451 | ret = jffs2_do_new_inode (c, f, mode, ri); |
452 | if (ret) { |
453 | make_bad_inode(inode); |
454 | iput(inode); |
455 | return ERR_PTR(ret); |
456 | } |
457 | inode->i_nlink = 1; |
458 | inode->i_ino = je32_to_cpu(ri->ino); |
459 | inode->i_mode = jemode_to_cpu(ri->mode); |
460 | inode->i_gid = je16_to_cpu(ri->gid); |
461 | inode->i_uid = je16_to_cpu(ri->uid); |
462 | inode->i_atime = inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC; |
463 | ri->atime = ri->mtime = ri->ctime = cpu_to_je32(I_SEC(inode->i_mtime)); |
464 | |
465 | inode->i_blocks = 0; |
466 | inode->i_size = 0; |
467 | |
468 | insert_inode_hash(inode); |
469 | |
470 | return inode; |
471 | } |
472 | |
473 | |
474 | int jffs2_do_fill_super(struct super_block *sb, void *data, int silent) |
475 | { |
476 | struct jffs2_sb_info *c; |
477 | struct inode *root_i; |
478 | int ret; |
479 | size_t blocks; |
480 | |
481 | c = JFFS2_SB_INFO(sb); |
482 | |
483 | #ifndef CONFIG_JFFS2_FS_WRITEBUFFER |
484 | if (c->mtd->type == MTD_NANDFLASH) { |
485 | printk(KERN_ERR "jffs2: Cannot operate on NAND flash unless jffs2 NAND support is compiled in.\n"); |
486 | return -EINVAL; |
487 | } |
488 | if (c->mtd->type == MTD_DATAFLASH) { |
489 | printk(KERN_ERR "jffs2: Cannot operate on DataFlash unless jffs2 DataFlash support is compiled in.\n"); |
490 | return -EINVAL; |
491 | } |
492 | #endif |
493 | |
494 | c->flash_size = c->mtd->size; |
495 | c->sector_size = c->mtd->erasesize; |
496 | blocks = c->flash_size / c->sector_size; |
497 | |
498 | /* |
499 | * Size alignment check |
500 | */ |
501 | if ((c->sector_size * blocks) != c->flash_size) { |
502 | c->flash_size = c->sector_size * blocks; |
503 | printk(KERN_INFO "jffs2: Flash size not aligned to erasesize, reducing to %dKiB\n", |
504 | c->flash_size / 1024); |
505 | } |
506 | |
507 | if (c->flash_size < 5*c->sector_size) { |
508 | printk(KERN_ERR "jffs2: Too few erase blocks (%d)\n", c->flash_size / c->sector_size); |
509 | return -EINVAL; |
510 | } |
511 | |
512 | c->cleanmarker_size = sizeof(struct jffs2_unknown_node); |
513 | |
514 | /* NAND (or other bizarre) flash... do setup accordingly */ |
515 | ret = jffs2_flash_setup(c); |
516 | if (ret) |
517 | return ret; |
518 | |
519 | c->inocache_list = kcalloc(INOCACHE_HASHSIZE, sizeof(struct jffs2_inode_cache *), GFP_KERNEL); |
520 | if (!c->inocache_list) { |
521 | ret = -ENOMEM; |
522 | goto out_wbuf; |
523 | } |
524 | |
525 | jffs2_init_xattr_subsystem(c); |
526 | |
527 | if ((ret = jffs2_do_mount_fs(c))) |
528 | goto out_inohash; |
529 | |
530 | D1(printk(KERN_DEBUG "jffs2_do_fill_super(): Getting root inode\n")); |
531 | root_i = jffs2_iget(sb, 1); |
532 | if (IS_ERR(root_i)) { |
533 | D1(printk(KERN_WARNING "get root inode failed\n")); |
534 | ret = PTR_ERR(root_i); |
535 | goto out_root; |
536 | } |
537 | |
538 | ret = -ENOMEM; |
539 | |
540 | D1(printk(KERN_DEBUG "jffs2_do_fill_super(): d_alloc_root()\n")); |
541 | sb->s_root = d_alloc_root(root_i); |
542 | if (!sb->s_root) |
543 | goto out_root_i; |
544 | |
545 | sb->s_maxbytes = 0xFFFFFFFF; |
546 | sb->s_blocksize = PAGE_CACHE_SIZE; |
547 | sb->s_blocksize_bits = PAGE_CACHE_SHIFT; |
548 | sb->s_magic = JFFS2_SUPER_MAGIC; |
549 | if (!(sb->s_flags & MS_RDONLY)) |
550 | jffs2_start_garbage_collect_thread(c); |
551 | return 0; |
552 | |
553 | out_root_i: |
554 | iput(root_i); |
555 | out_root: |
556 | jffs2_free_ino_caches(c); |
557 | jffs2_free_raw_node_refs(c); |
558 | if (jffs2_blocks_use_vmalloc(c)) |
559 | vfree(c->blocks); |
560 | else |
561 | kfree(c->blocks); |
562 | out_inohash: |
563 | jffs2_clear_xattr_subsystem(c); |
564 | kfree(c->inocache_list); |
565 | out_wbuf: |
566 | jffs2_flash_cleanup(c); |
567 | |
568 | return ret; |
569 | } |
570 | |
571 | void jffs2_gc_release_inode(struct jffs2_sb_info *c, |
572 | struct jffs2_inode_info *f) |
573 | { |
574 | iput(OFNI_EDONI_2SFFJ(f)); |
575 | } |
576 | |
577 | struct jffs2_inode_info *jffs2_gc_fetch_inode(struct jffs2_sb_info *c, |
578 | int inum, int unlinked) |
579 | { |
580 | struct inode *inode; |
581 | struct jffs2_inode_cache *ic; |
582 | |
583 | if (unlinked) { |
584 | /* The inode has zero nlink but its nodes weren't yet marked |
585 | obsolete. This has to be because we're still waiting for |
586 | the final (close() and) iput() to happen. |
587 | |
588 | There's a possibility that the final iput() could have |
589 | happened while we were contemplating. In order to ensure |
590 | that we don't cause a new read_inode() (which would fail) |
591 | for the inode in question, we use ilookup() in this case |
592 | instead of iget(). |
593 | |
594 | The nlink can't _become_ zero at this point because we're |
595 | holding the alloc_sem, and jffs2_do_unlink() would also |
596 | need that while decrementing nlink on any inode. |
597 | */ |
598 | inode = ilookup(OFNI_BS_2SFFJ(c), inum); |
599 | if (!inode) { |
600 | D1(printk(KERN_DEBUG "ilookup() failed for ino #%u; inode is probably deleted.\n", |
601 | inum)); |
602 | |
603 | spin_lock(&c->inocache_lock); |
604 | ic = jffs2_get_ino_cache(c, inum); |
605 | if (!ic) { |
606 | D1(printk(KERN_DEBUG "Inode cache for ino #%u is gone.\n", inum)); |
607 | spin_unlock(&c->inocache_lock); |
608 | return NULL; |
609 | } |
610 | if (ic->state != INO_STATE_CHECKEDABSENT) { |
611 | /* Wait for progress. Don't just loop */ |
612 | D1(printk(KERN_DEBUG "Waiting for ino #%u in state %d\n", |
613 | ic->ino, ic->state)); |
614 | sleep_on_spinunlock(&c->inocache_wq, &c->inocache_lock); |
615 | } else { |
616 | spin_unlock(&c->inocache_lock); |
617 | } |
618 | |
619 | return NULL; |
620 | } |
621 | } else { |
622 | /* Inode has links to it still; they're not going away because |
623 | jffs2_do_unlink() would need the alloc_sem and we have it. |
624 | Just iget() it, and if read_inode() is necessary that's OK. |
625 | */ |
626 | inode = jffs2_iget(OFNI_BS_2SFFJ(c), inum); |
627 | if (IS_ERR(inode)) |
628 | return ERR_CAST(inode); |
629 | } |
630 | if (is_bad_inode(inode)) { |
631 | printk(KERN_NOTICE "Eep. read_inode() failed for ino #%u. unlinked %d\n", |
632 | inum, unlinked); |
633 | /* NB. This will happen again. We need to do something appropriate here. */ |
634 | iput(inode); |
635 | return ERR_PTR(-EIO); |
636 | } |
637 | |
638 | return JFFS2_INODE_INFO(inode); |
639 | } |
640 | |
641 | unsigned char *jffs2_gc_fetch_page(struct jffs2_sb_info *c, |
642 | struct jffs2_inode_info *f, |
643 | unsigned long offset, |
644 | unsigned long *priv) |
645 | { |
646 | struct inode *inode = OFNI_EDONI_2SFFJ(f); |
647 | struct page *pg; |
648 | |
649 | pg = read_cache_page_async(inode->i_mapping, offset >> PAGE_CACHE_SHIFT, |
650 | (void *)jffs2_do_readpage_unlock, inode); |
651 | if (IS_ERR(pg)) |
652 | return (void *)pg; |
653 | |
654 | *priv = (unsigned long)pg; |
655 | return kmap(pg); |
656 | } |
657 | |
658 | void jffs2_gc_release_page(struct jffs2_sb_info *c, |
659 | unsigned char *ptr, |
660 | unsigned long *priv) |
661 | { |
662 | struct page *pg = (void *)*priv; |
663 | |
664 | kunmap(pg); |
665 | page_cache_release(pg); |
666 | } |
667 | |
668 | static int jffs2_flash_setup(struct jffs2_sb_info *c) { |
669 | int ret = 0; |
670 | |
671 | if (jffs2_cleanmarker_oob(c)) { |
672 | /* NAND flash... do setup accordingly */ |
673 | ret = jffs2_nand_flash_setup(c); |
674 | if (ret) |
675 | return ret; |
676 | } |
677 | |
678 | /* and Dataflash */ |
679 | if (jffs2_dataflash(c)) { |
680 | ret = jffs2_dataflash_setup(c); |
681 | if (ret) |
682 | return ret; |
683 | } |
684 | |
685 | /* and Intel "Sibley" flash */ |
686 | if (jffs2_nor_wbuf_flash(c)) { |
687 | ret = jffs2_nor_wbuf_flash_setup(c); |
688 | if (ret) |
689 | return ret; |
690 | } |
691 | |
692 | /* and an UBI volume */ |
693 | if (jffs2_ubivol(c)) { |
694 | ret = jffs2_ubivol_setup(c); |
695 | if (ret) |
696 | return ret; |
697 | } |
698 | |
699 | return ret; |
700 | } |
701 | |
702 | void jffs2_flash_cleanup(struct jffs2_sb_info *c) { |
703 | |
704 | if (jffs2_cleanmarker_oob(c)) { |
705 | jffs2_nand_flash_cleanup(c); |
706 | } |
707 | |
708 | /* and DataFlash */ |
709 | if (jffs2_dataflash(c)) { |
710 | jffs2_dataflash_cleanup(c); |
711 | } |
712 | |
713 | /* and Intel "Sibley" flash */ |
714 | if (jffs2_nor_wbuf_flash(c)) { |
715 | jffs2_nor_wbuf_flash_cleanup(c); |
716 | } |
717 | |
718 | /* and an UBI volume */ |
719 | if (jffs2_ubivol(c)) { |
720 | jffs2_ubivol_cleanup(c); |
721 | } |
722 | } |
723 |
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od-2011-09-18
v2.6.34-rc5
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