1 | /* |
2 | * JFFS2 -- Journalling Flash File System, Version 2. |
3 | * |
4 | * Copyright © 2001-2007 Red Hat, Inc. |
5 | * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org> |
6 | * |
7 | * Created by David Woodhouse <dwmw2@infradead.org> |
8 | * |
9 | * For licensing information, see the file 'LICENCE' in this directory. |
10 | * |
11 | */ |
12 | |
13 | #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt |
14 | |
15 | #include <linux/capability.h> |
16 | #include <linux/kernel.h> |
17 | #include <linux/sched.h> |
18 | #include <linux/cred.h> |
19 | #include <linux/fs.h> |
20 | #include <linux/fs_context.h> |
21 | #include <linux/list.h> |
22 | #include <linux/mtd/mtd.h> |
23 | #include <linux/pagemap.h> |
24 | #include <linux/slab.h> |
25 | #include <linux/vmalloc.h> |
26 | #include <linux/vfs.h> |
27 | #include <linux/crc32.h> |
28 | #include "nodelist.h" |
29 | |
30 | static int jffs2_flash_setup(struct jffs2_sb_info *c); |
31 | |
32 | int jffs2_do_setattr (struct inode *inode, struct iattr *iattr) |
33 | { |
34 | struct jffs2_full_dnode *old_metadata, *new_metadata; |
35 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); |
36 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); |
37 | struct jffs2_raw_inode *ri; |
38 | union jffs2_device_node dev; |
39 | unsigned char *mdata = NULL; |
40 | int mdatalen = 0; |
41 | unsigned int ivalid; |
42 | uint32_t alloclen; |
43 | int ret; |
44 | int alloc_type = ALLOC_NORMAL; |
45 | |
46 | jffs2_dbg(1, "%s(): ino #%lu\n" , __func__, inode->i_ino); |
47 | |
48 | /* Special cases - we don't want more than one data node |
49 | for these types on the medium at any time. So setattr |
50 | must read the original data associated with the node |
51 | (i.e. the device numbers or the target name) and write |
52 | it out again with the appropriate data attached */ |
53 | if (S_ISBLK(inode->i_mode) || S_ISCHR(inode->i_mode)) { |
54 | /* For these, we don't actually need to read the old node */ |
55 | mdatalen = jffs2_encode_dev(jdev: &dev, rdev: inode->i_rdev); |
56 | mdata = (char *)&dev; |
57 | jffs2_dbg(1, "%s(): Writing %d bytes of kdev_t\n" , |
58 | __func__, mdatalen); |
59 | } else if (S_ISLNK(inode->i_mode)) { |
60 | mutex_lock(&f->sem); |
61 | mdatalen = f->metadata->size; |
62 | mdata = kmalloc(size: f->metadata->size, GFP_USER); |
63 | if (!mdata) { |
64 | mutex_unlock(lock: &f->sem); |
65 | return -ENOMEM; |
66 | } |
67 | ret = jffs2_read_dnode(c, f, fd: f->metadata, buf: mdata, ofs: 0, len: mdatalen); |
68 | if (ret) { |
69 | mutex_unlock(lock: &f->sem); |
70 | kfree(objp: mdata); |
71 | return ret; |
72 | } |
73 | mutex_unlock(lock: &f->sem); |
74 | jffs2_dbg(1, "%s(): Writing %d bytes of symlink target\n" , |
75 | __func__, mdatalen); |
76 | } |
77 | |
78 | ri = jffs2_alloc_raw_inode(); |
79 | if (!ri) { |
80 | if (S_ISLNK(inode->i_mode)) |
81 | kfree(objp: mdata); |
82 | return -ENOMEM; |
83 | } |
84 | |
85 | ret = jffs2_reserve_space(c, minsize: sizeof(*ri) + mdatalen, len: &alloclen, |
86 | ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); |
87 | if (ret) { |
88 | jffs2_free_raw_inode(ri); |
89 | if (S_ISLNK(inode->i_mode)) |
90 | kfree(objp: mdata); |
91 | return ret; |
92 | } |
93 | mutex_lock(&f->sem); |
94 | ivalid = iattr->ia_valid; |
95 | |
96 | ri->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); |
97 | ri->nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE); |
98 | ri->totlen = cpu_to_je32(sizeof(*ri) + mdatalen); |
99 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); |
100 | |
101 | ri->ino = cpu_to_je32(inode->i_ino); |
102 | ri->version = cpu_to_je32(++f->highest_version); |
103 | |
104 | ri->uid = cpu_to_je16((ivalid & ATTR_UID)? |
105 | from_kuid(&init_user_ns, iattr->ia_uid):i_uid_read(inode)); |
106 | ri->gid = cpu_to_je16((ivalid & ATTR_GID)? |
107 | from_kgid(&init_user_ns, iattr->ia_gid):i_gid_read(inode)); |
108 | |
109 | if (ivalid & ATTR_MODE) |
110 | ri->mode = cpu_to_jemode(iattr->ia_mode); |
111 | else |
112 | ri->mode = cpu_to_jemode(inode->i_mode); |
113 | |
114 | |
115 | ri->isize = cpu_to_je32((ivalid & ATTR_SIZE)?iattr->ia_size:inode->i_size); |
116 | ri->atime = cpu_to_je32(I_SEC((ivalid & ATTR_ATIME)?iattr->ia_atime:inode_get_atime(inode))); |
117 | ri->mtime = cpu_to_je32(I_SEC((ivalid & ATTR_MTIME)?iattr->ia_mtime:inode_get_mtime(inode))); |
118 | ri->ctime = cpu_to_je32(I_SEC((ivalid & ATTR_CTIME)?iattr->ia_ctime:inode_get_ctime(inode))); |
119 | |
120 | ri->offset = cpu_to_je32(0); |
121 | ri->csize = ri->dsize = cpu_to_je32(mdatalen); |
122 | ri->compr = JFFS2_COMPR_NONE; |
123 | if (ivalid & ATTR_SIZE && inode->i_size < iattr->ia_size) { |
124 | /* It's an extension. Make it a hole node */ |
125 | ri->compr = JFFS2_COMPR_ZERO; |
126 | ri->dsize = cpu_to_je32(iattr->ia_size - inode->i_size); |
127 | ri->offset = cpu_to_je32(inode->i_size); |
128 | } else if (ivalid & ATTR_SIZE && !iattr->ia_size) { |
129 | /* For truncate-to-zero, treat it as deletion because |
130 | it'll always be obsoleting all previous nodes */ |
131 | alloc_type = ALLOC_DELETION; |
132 | } |
133 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); |
134 | if (mdatalen) |
135 | ri->data_crc = cpu_to_je32(crc32(0, mdata, mdatalen)); |
136 | else |
137 | ri->data_crc = cpu_to_je32(0); |
138 | |
139 | new_metadata = jffs2_write_dnode(c, f, ri, mdata, mdatalen, alloc_type); |
140 | if (S_ISLNK(inode->i_mode)) |
141 | kfree(mdata); |
142 | |
143 | if (IS_ERR(new_metadata)) { |
144 | jffs2_complete_reservation(c); |
145 | jffs2_free_raw_inode(ri); |
146 | mutex_unlock(&f->sem); |
147 | return PTR_ERR(new_metadata); |
148 | } |
149 | /* It worked. Update the inode */ |
150 | inode_set_atime_to_ts(inode, ITIME(je32_to_cpu(ri->atime))); |
151 | inode_set_ctime_to_ts(inode, ITIME(je32_to_cpu(ri->ctime))); |
152 | inode_set_mtime_to_ts(inode, ITIME(je32_to_cpu(ri->mtime))); |
153 | inode->i_mode = jemode_to_cpu(ri->mode); |
154 | i_uid_write(inode, je16_to_cpu(ri->uid)); |
155 | i_gid_write(inode, je16_to_cpu(ri->gid)); |
156 | |
157 | |
158 | old_metadata = f->metadata; |
159 | |
160 | if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size) |
161 | jffs2_truncate_fragtree (c, &f->fragtree, iattr->ia_size); |
162 | |
163 | if (ivalid & ATTR_SIZE && inode->i_size < iattr->ia_size) { |
164 | jffs2_add_full_dnode_to_inode(c, f, new_metadata); |
165 | inode->i_size = iattr->ia_size; |
166 | inode->i_blocks = (inode->i_size + 511) >> 9; |
167 | f->metadata = NULL; |
168 | } else { |
169 | f->metadata = new_metadata; |
170 | } |
171 | if (old_metadata) { |
172 | jffs2_mark_node_obsolete(c, old_metadata->raw); |
173 | jffs2_free_full_dnode(old_metadata); |
174 | } |
175 | jffs2_free_raw_inode(ri); |
176 | |
177 | mutex_unlock(&f->sem); |
178 | jffs2_complete_reservation(c); |
179 | |
180 | /* We have to do the truncate_setsize() without f->sem held, since |
181 | some pages may be locked and waiting for it in read_folio(). |
182 | We are protected from a simultaneous write() extending i_size |
183 | back past iattr->ia_size, because do_truncate() holds the |
184 | generic inode semaphore. */ |
185 | if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size) { |
186 | truncate_setsize(inode, iattr->ia_size); |
187 | inode->i_blocks = (inode->i_size + 511) >> 9; |
188 | } |
189 | |
190 | return 0; |
191 | } |
192 | |
193 | int jffs2_setattr(struct mnt_idmap *idmap, struct dentry *dentry, |
194 | struct iattr *iattr) |
195 | { |
196 | struct inode *inode = d_inode(dentry); |
197 | int rc; |
198 | |
199 | rc = setattr_prepare(&nop_mnt_idmap, dentry, iattr); |
200 | if (rc) |
201 | return rc; |
202 | |
203 | rc = jffs2_do_setattr(inode, iattr); |
204 | if (!rc && (iattr->ia_valid & ATTR_MODE)) |
205 | rc = posix_acl_chmod(&nop_mnt_idmap, dentry, inode->i_mode); |
206 | |
207 | return rc; |
208 | } |
209 | |
210 | int jffs2_statfs(struct dentry *dentry, struct kstatfs *buf) |
211 | { |
212 | struct jffs2_sb_info *c = JFFS2_SB_INFO(dentry->d_sb); |
213 | unsigned long avail; |
214 | |
215 | buf->f_type = JFFS2_SUPER_MAGIC; |
216 | buf->f_bsize = 1 << PAGE_SHIFT; |
217 | buf->f_blocks = c->flash_size >> PAGE_SHIFT; |
218 | buf->f_files = 0; |
219 | buf->f_ffree = 0; |
220 | buf->f_namelen = JFFS2_MAX_NAME_LEN; |
221 | buf->f_fsid.val[0] = JFFS2_SUPER_MAGIC; |
222 | buf->f_fsid.val[1] = c->mtd->index; |
223 | |
224 | spin_lock(lock: &c->erase_completion_lock); |
225 | avail = c->dirty_size + c->free_size; |
226 | if (avail > c->sector_size * c->resv_blocks_write) |
227 | avail -= c->sector_size * c->resv_blocks_write; |
228 | else |
229 | avail = 0; |
230 | spin_unlock(lock: &c->erase_completion_lock); |
231 | |
232 | buf->f_bavail = buf->f_bfree = avail >> PAGE_SHIFT; |
233 | |
234 | return 0; |
235 | } |
236 | |
237 | |
238 | void jffs2_evict_inode (struct inode *inode) |
239 | { |
240 | /* We can forget about this inode for now - drop all |
241 | * the nodelists associated with it, etc. |
242 | */ |
243 | struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb); |
244 | struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode); |
245 | |
246 | jffs2_dbg(1, "%s(): ino #%lu mode %o\n" , |
247 | __func__, inode->i_ino, inode->i_mode); |
248 | truncate_inode_pages_final(&inode->i_data); |
249 | clear_inode(inode); |
250 | jffs2_do_clear_inode(c, f); |
251 | } |
252 | |
253 | struct inode *jffs2_iget(struct super_block *sb, unsigned long ino) |
254 | { |
255 | struct jffs2_inode_info *f; |
256 | struct jffs2_sb_info *c; |
257 | struct jffs2_raw_inode latest_node; |
258 | union jffs2_device_node jdev; |
259 | struct inode *inode; |
260 | dev_t rdev = 0; |
261 | int ret; |
262 | |
263 | jffs2_dbg(1, "%s(): ino == %lu\n" , __func__, ino); |
264 | |
265 | inode = iget_locked(sb, ino); |
266 | if (!inode) |
267 | return ERR_PTR(error: -ENOMEM); |
268 | if (!(inode->i_state & I_NEW)) |
269 | return inode; |
270 | |
271 | f = JFFS2_INODE_INFO(inode); |
272 | c = JFFS2_SB_INFO(inode->i_sb); |
273 | |
274 | jffs2_init_inode_info(f); |
275 | mutex_lock(&f->sem); |
276 | |
277 | ret = jffs2_do_read_inode(c, f, ino: inode->i_ino, latest_node: &latest_node); |
278 | if (ret) |
279 | goto error; |
280 | |
281 | inode->i_mode = jemode_to_cpu(latest_node.mode); |
282 | i_uid_write(inode, je16_to_cpu(latest_node.uid)); |
283 | i_gid_write(inode, je16_to_cpu(latest_node.gid)); |
284 | inode->i_size = je32_to_cpu(latest_node.isize); |
285 | inode_set_atime_to_ts(inode, ITIME(je32_to_cpu(latest_node.atime))); |
286 | inode_set_mtime_to_ts(inode, ITIME(je32_to_cpu(latest_node.mtime))); |
287 | inode_set_ctime_to_ts(inode, ITIME(je32_to_cpu(latest_node.ctime))); |
288 | |
289 | set_nlink(inode, nlink: f->inocache->pino_nlink); |
290 | |
291 | inode->i_blocks = (inode->i_size + 511) >> 9; |
292 | |
293 | switch (inode->i_mode & S_IFMT) { |
294 | |
295 | case S_IFLNK: |
296 | inode->i_op = &jffs2_symlink_inode_operations; |
297 | inode->i_link = f->target; |
298 | break; |
299 | |
300 | case S_IFDIR: |
301 | { |
302 | struct jffs2_full_dirent *fd; |
303 | set_nlink(inode, nlink: 2); /* parent and '.' */ |
304 | |
305 | for (fd=f->dents; fd; fd = fd->next) { |
306 | if (fd->type == DT_DIR && fd->ino) |
307 | inc_nlink(inode); |
308 | } |
309 | /* Root dir gets i_nlink 3 for some reason */ |
310 | if (inode->i_ino == 1) |
311 | inc_nlink(inode); |
312 | |
313 | inode->i_op = &jffs2_dir_inode_operations; |
314 | inode->i_fop = &jffs2_dir_operations; |
315 | break; |
316 | } |
317 | case S_IFREG: |
318 | inode->i_op = &jffs2_file_inode_operations; |
319 | inode->i_fop = &jffs2_file_operations; |
320 | inode->i_mapping->a_ops = &jffs2_file_address_operations; |
321 | inode->i_mapping->nrpages = 0; |
322 | break; |
323 | |
324 | case S_IFBLK: |
325 | case S_IFCHR: |
326 | /* Read the device numbers from the media */ |
327 | if (f->metadata->size != sizeof(jdev.old_id) && |
328 | f->metadata->size != sizeof(jdev.new_id)) { |
329 | pr_notice("Device node has strange size %d\n" , |
330 | f->metadata->size); |
331 | goto error_io; |
332 | } |
333 | jffs2_dbg(1, "Reading device numbers from flash\n" ); |
334 | ret = jffs2_read_dnode(c, f, fd: f->metadata, buf: (char *)&jdev, ofs: 0, len: f->metadata->size); |
335 | if (ret < 0) { |
336 | /* Eep */ |
337 | pr_notice("Read device numbers for inode %lu failed\n" , |
338 | (unsigned long)inode->i_ino); |
339 | goto error; |
340 | } |
341 | if (f->metadata->size == sizeof(jdev.old_id)) |
342 | rdev = old_decode_dev(je16_to_cpu(jdev.old_id)); |
343 | else |
344 | rdev = new_decode_dev(je32_to_cpu(jdev.new_id)); |
345 | fallthrough; |
346 | |
347 | case S_IFSOCK: |
348 | case S_IFIFO: |
349 | inode->i_op = &jffs2_file_inode_operations; |
350 | init_special_inode(inode, inode->i_mode, rdev); |
351 | break; |
352 | |
353 | default: |
354 | pr_warn("%s(): Bogus i_mode %o for ino %lu\n" , |
355 | __func__, inode->i_mode, (unsigned long)inode->i_ino); |
356 | } |
357 | |
358 | mutex_unlock(lock: &f->sem); |
359 | |
360 | jffs2_dbg(1, "jffs2_read_inode() returning\n" ); |
361 | unlock_new_inode(inode); |
362 | return inode; |
363 | |
364 | error_io: |
365 | ret = -EIO; |
366 | error: |
367 | mutex_unlock(lock: &f->sem); |
368 | iget_failed(inode); |
369 | return ERR_PTR(error: ret); |
370 | } |
371 | |
372 | void jffs2_dirty_inode(struct inode *inode, int flags) |
373 | { |
374 | struct iattr iattr; |
375 | |
376 | if (!(inode->i_state & I_DIRTY_DATASYNC)) { |
377 | jffs2_dbg(2, "%s(): not calling setattr() for ino #%lu\n" , |
378 | __func__, inode->i_ino); |
379 | return; |
380 | } |
381 | |
382 | jffs2_dbg(1, "%s(): calling setattr() for ino #%lu\n" , |
383 | __func__, inode->i_ino); |
384 | |
385 | iattr.ia_valid = ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_MTIME|ATTR_CTIME; |
386 | iattr.ia_mode = inode->i_mode; |
387 | iattr.ia_uid = inode->i_uid; |
388 | iattr.ia_gid = inode->i_gid; |
389 | iattr.ia_atime = inode_get_atime(inode); |
390 | iattr.ia_mtime = inode_get_mtime(inode); |
391 | iattr.ia_ctime = inode_get_ctime(inode); |
392 | |
393 | jffs2_do_setattr(inode, iattr: &iattr); |
394 | } |
395 | |
396 | int jffs2_do_remount_fs(struct super_block *sb, struct fs_context *fc) |
397 | { |
398 | struct jffs2_sb_info *c = JFFS2_SB_INFO(sb); |
399 | |
400 | if (c->flags & JFFS2_SB_FLAG_RO && !sb_rdonly(sb)) |
401 | return -EROFS; |
402 | |
403 | /* We stop if it was running, then restart if it needs to. |
404 | This also catches the case where it was stopped and this |
405 | is just a remount to restart it. |
406 | Flush the writebuffer, if necessary, else we loose it */ |
407 | if (!sb_rdonly(sb)) { |
408 | jffs2_stop_garbage_collect_thread(c); |
409 | mutex_lock(&c->alloc_sem); |
410 | jffs2_flush_wbuf_pad(c); |
411 | mutex_unlock(lock: &c->alloc_sem); |
412 | } |
413 | |
414 | if (!(fc->sb_flags & SB_RDONLY)) |
415 | jffs2_start_garbage_collect_thread(c); |
416 | |
417 | fc->sb_flags |= SB_NOATIME; |
418 | return 0; |
419 | } |
420 | |
421 | /* jffs2_new_inode: allocate a new inode and inocache, add it to the hash, |
422 | fill in the raw_inode while you're at it. */ |
423 | struct inode *jffs2_new_inode (struct inode *dir_i, umode_t mode, struct jffs2_raw_inode *ri) |
424 | { |
425 | struct inode *inode; |
426 | struct super_block *sb = dir_i->i_sb; |
427 | struct jffs2_sb_info *c; |
428 | struct jffs2_inode_info *f; |
429 | int ret; |
430 | |
431 | jffs2_dbg(1, "%s(): dir_i %ld, mode 0x%x\n" , |
432 | __func__, dir_i->i_ino, mode); |
433 | |
434 | c = JFFS2_SB_INFO(sb); |
435 | |
436 | inode = new_inode(sb); |
437 | |
438 | if (!inode) |
439 | return ERR_PTR(error: -ENOMEM); |
440 | |
441 | f = JFFS2_INODE_INFO(inode); |
442 | jffs2_init_inode_info(f); |
443 | mutex_lock(&f->sem); |
444 | |
445 | memset(ri, 0, sizeof(*ri)); |
446 | /* Set OS-specific defaults for new inodes */ |
447 | ri->uid = cpu_to_je16(from_kuid(&init_user_ns, current_fsuid())); |
448 | |
449 | if (dir_i->i_mode & S_ISGID) { |
450 | ri->gid = cpu_to_je16(i_gid_read(dir_i)); |
451 | if (S_ISDIR(mode)) |
452 | mode |= S_ISGID; |
453 | } else { |
454 | ri->gid = cpu_to_je16(from_kgid(&init_user_ns, current_fsgid())); |
455 | } |
456 | |
457 | /* POSIX ACLs have to be processed now, at least partly. |
458 | The umask is only applied if there's no default ACL */ |
459 | ret = jffs2_init_acl_pre(dir_i, inode, &mode); |
460 | if (ret) { |
461 | mutex_unlock(lock: &f->sem); |
462 | make_bad_inode(inode); |
463 | iput(inode); |
464 | return ERR_PTR(error: ret); |
465 | } |
466 | ret = jffs2_do_new_inode (c, f, mode, ri); |
467 | if (ret) { |
468 | mutex_unlock(lock: &f->sem); |
469 | make_bad_inode(inode); |
470 | iput(inode); |
471 | return ERR_PTR(error: ret); |
472 | } |
473 | set_nlink(inode, nlink: 1); |
474 | inode->i_ino = je32_to_cpu(ri->ino); |
475 | inode->i_mode = jemode_to_cpu(ri->mode); |
476 | i_gid_write(inode, je16_to_cpu(ri->gid)); |
477 | i_uid_write(inode, je16_to_cpu(ri->uid)); |
478 | simple_inode_init_ts(inode); |
479 | ri->atime = ri->mtime = ri->ctime = cpu_to_je32(I_SEC(inode_get_mtime(inode))); |
480 | |
481 | inode->i_blocks = 0; |
482 | inode->i_size = 0; |
483 | |
484 | if (insert_inode_locked(inode) < 0) { |
485 | mutex_unlock(lock: &f->sem); |
486 | make_bad_inode(inode); |
487 | iput(inode); |
488 | return ERR_PTR(error: -EINVAL); |
489 | } |
490 | |
491 | return inode; |
492 | } |
493 | |
494 | static int calculate_inocache_hashsize(uint32_t flash_size) |
495 | { |
496 | /* |
497 | * Pick a inocache hash size based on the size of the medium. |
498 | * Count how many megabytes we're dealing with, apply a hashsize twice |
499 | * that size, but rounding down to the usual big powers of 2. And keep |
500 | * to sensible bounds. |
501 | */ |
502 | |
503 | int size_mb = flash_size / 1024 / 1024; |
504 | int hashsize = (size_mb * 2) & ~0x3f; |
505 | |
506 | if (hashsize < INOCACHE_HASHSIZE_MIN) |
507 | return INOCACHE_HASHSIZE_MIN; |
508 | if (hashsize > INOCACHE_HASHSIZE_MAX) |
509 | return INOCACHE_HASHSIZE_MAX; |
510 | |
511 | return hashsize; |
512 | } |
513 | |
514 | int jffs2_do_fill_super(struct super_block *sb, struct fs_context *fc) |
515 | { |
516 | struct jffs2_sb_info *c; |
517 | struct inode *root_i; |
518 | int ret; |
519 | size_t blocks; |
520 | |
521 | c = JFFS2_SB_INFO(sb); |
522 | |
523 | /* Do not support the MLC nand */ |
524 | if (c->mtd->type == MTD_MLCNANDFLASH) |
525 | return -EINVAL; |
526 | |
527 | #ifndef CONFIG_JFFS2_FS_WRITEBUFFER |
528 | if (c->mtd->type == MTD_NANDFLASH) { |
529 | errorf(fc, "Cannot operate on NAND flash unless jffs2 NAND support is compiled in" ); |
530 | return -EINVAL; |
531 | } |
532 | if (c->mtd->type == MTD_DATAFLASH) { |
533 | errorf(fc, "Cannot operate on DataFlash unless jffs2 DataFlash support is compiled in" ); |
534 | return -EINVAL; |
535 | } |
536 | #endif |
537 | |
538 | c->flash_size = c->mtd->size; |
539 | c->sector_size = c->mtd->erasesize; |
540 | blocks = c->flash_size / c->sector_size; |
541 | |
542 | /* |
543 | * Size alignment check |
544 | */ |
545 | if ((c->sector_size * blocks) != c->flash_size) { |
546 | c->flash_size = c->sector_size * blocks; |
547 | infof(fc, "Flash size not aligned to erasesize, reducing to %dKiB" , |
548 | c->flash_size / 1024); |
549 | } |
550 | |
551 | if (c->flash_size < 5*c->sector_size) { |
552 | errorf(fc, "Too few erase blocks (%d)" , |
553 | c->flash_size / c->sector_size); |
554 | return -EINVAL; |
555 | } |
556 | |
557 | c->cleanmarker_size = sizeof(struct jffs2_unknown_node); |
558 | |
559 | /* NAND (or other bizarre) flash... do setup accordingly */ |
560 | ret = jffs2_flash_setup(c); |
561 | if (ret) |
562 | return ret; |
563 | |
564 | c->inocache_hashsize = calculate_inocache_hashsize(flash_size: c->flash_size); |
565 | c->inocache_list = kcalloc(n: c->inocache_hashsize, size: sizeof(struct jffs2_inode_cache *), GFP_KERNEL); |
566 | if (!c->inocache_list) { |
567 | ret = -ENOMEM; |
568 | goto out_wbuf; |
569 | } |
570 | |
571 | jffs2_init_xattr_subsystem(c); |
572 | |
573 | if ((ret = jffs2_do_mount_fs(c))) |
574 | goto out_inohash; |
575 | |
576 | jffs2_dbg(1, "%s(): Getting root inode\n" , __func__); |
577 | root_i = jffs2_iget(sb, ino: 1); |
578 | if (IS_ERR(ptr: root_i)) { |
579 | jffs2_dbg(1, "get root inode failed\n" ); |
580 | ret = PTR_ERR(ptr: root_i); |
581 | goto out_root; |
582 | } |
583 | |
584 | ret = -ENOMEM; |
585 | |
586 | jffs2_dbg(1, "%s(): d_make_root()\n" , __func__); |
587 | sb->s_root = d_make_root(root_i); |
588 | if (!sb->s_root) |
589 | goto out_root; |
590 | |
591 | sb->s_maxbytes = 0xFFFFFFFF; |
592 | sb->s_blocksize = PAGE_SIZE; |
593 | sb->s_blocksize_bits = PAGE_SHIFT; |
594 | sb->s_magic = JFFS2_SUPER_MAGIC; |
595 | sb->s_time_min = 0; |
596 | sb->s_time_max = U32_MAX; |
597 | |
598 | if (!sb_rdonly(sb)) |
599 | jffs2_start_garbage_collect_thread(c); |
600 | return 0; |
601 | |
602 | out_root: |
603 | jffs2_free_ino_caches(c); |
604 | jffs2_free_raw_node_refs(c); |
605 | kvfree(addr: c->blocks); |
606 | jffs2_clear_xattr_subsystem(c); |
607 | jffs2_sum_exit(c); |
608 | out_inohash: |
609 | kfree(objp: c->inocache_list); |
610 | out_wbuf: |
611 | jffs2_flash_cleanup(c); |
612 | |
613 | return ret; |
614 | } |
615 | |
616 | void jffs2_gc_release_inode(struct jffs2_sb_info *c, |
617 | struct jffs2_inode_info *f) |
618 | { |
619 | iput(OFNI_EDONI_2SFFJ(f)); |
620 | } |
621 | |
622 | struct jffs2_inode_info *jffs2_gc_fetch_inode(struct jffs2_sb_info *c, |
623 | int inum, int unlinked) |
624 | { |
625 | struct inode *inode; |
626 | struct jffs2_inode_cache *ic; |
627 | |
628 | if (unlinked) { |
629 | /* The inode has zero nlink but its nodes weren't yet marked |
630 | obsolete. This has to be because we're still waiting for |
631 | the final (close() and) iput() to happen. |
632 | |
633 | There's a possibility that the final iput() could have |
634 | happened while we were contemplating. In order to ensure |
635 | that we don't cause a new read_inode() (which would fail) |
636 | for the inode in question, we use ilookup() in this case |
637 | instead of iget(). |
638 | |
639 | The nlink can't _become_ zero at this point because we're |
640 | holding the alloc_sem, and jffs2_do_unlink() would also |
641 | need that while decrementing nlink on any inode. |
642 | */ |
643 | inode = ilookup(OFNI_BS_2SFFJ(c), ino: inum); |
644 | if (!inode) { |
645 | jffs2_dbg(1, "ilookup() failed for ino #%u; inode is probably deleted.\n" , |
646 | inum); |
647 | |
648 | spin_lock(lock: &c->inocache_lock); |
649 | ic = jffs2_get_ino_cache(c, ino: inum); |
650 | if (!ic) { |
651 | jffs2_dbg(1, "Inode cache for ino #%u is gone\n" , |
652 | inum); |
653 | spin_unlock(lock: &c->inocache_lock); |
654 | return NULL; |
655 | } |
656 | if (ic->state != INO_STATE_CHECKEDABSENT) { |
657 | /* Wait for progress. Don't just loop */ |
658 | jffs2_dbg(1, "Waiting for ino #%u in state %d\n" , |
659 | ic->ino, ic->state); |
660 | sleep_on_spinunlock(&c->inocache_wq, &c->inocache_lock); |
661 | } else { |
662 | spin_unlock(lock: &c->inocache_lock); |
663 | } |
664 | |
665 | return NULL; |
666 | } |
667 | } else { |
668 | /* Inode has links to it still; they're not going away because |
669 | jffs2_do_unlink() would need the alloc_sem and we have it. |
670 | Just iget() it, and if read_inode() is necessary that's OK. |
671 | */ |
672 | inode = jffs2_iget(OFNI_BS_2SFFJ(c), ino: inum); |
673 | if (IS_ERR(ptr: inode)) |
674 | return ERR_CAST(ptr: inode); |
675 | } |
676 | if (is_bad_inode(inode)) { |
677 | pr_notice("Eep. read_inode() failed for ino #%u. unlinked %d\n" , |
678 | inum, unlinked); |
679 | /* NB. This will happen again. We need to do something appropriate here. */ |
680 | iput(inode); |
681 | return ERR_PTR(error: -EIO); |
682 | } |
683 | |
684 | return JFFS2_INODE_INFO(inode); |
685 | } |
686 | |
687 | static int jffs2_flash_setup(struct jffs2_sb_info *c) { |
688 | int ret = 0; |
689 | |
690 | if (jffs2_cleanmarker_oob(c)) { |
691 | /* NAND flash... do setup accordingly */ |
692 | ret = jffs2_nand_flash_setup(c); |
693 | if (ret) |
694 | return ret; |
695 | } |
696 | |
697 | /* and Dataflash */ |
698 | if (jffs2_dataflash(c)) { |
699 | ret = jffs2_dataflash_setup(c); |
700 | if (ret) |
701 | return ret; |
702 | } |
703 | |
704 | /* and Intel "Sibley" flash */ |
705 | if (jffs2_nor_wbuf_flash(c)) { |
706 | ret = jffs2_nor_wbuf_flash_setup(c); |
707 | if (ret) |
708 | return ret; |
709 | } |
710 | |
711 | /* and an UBI volume */ |
712 | if (jffs2_ubivol(c)) { |
713 | ret = jffs2_ubivol_setup(c); |
714 | if (ret) |
715 | return ret; |
716 | } |
717 | |
718 | return ret; |
719 | } |
720 | |
721 | void jffs2_flash_cleanup(struct jffs2_sb_info *c) { |
722 | |
723 | if (jffs2_cleanmarker_oob(c)) { |
724 | jffs2_nand_flash_cleanup(c); |
725 | } |
726 | |
727 | /* and DataFlash */ |
728 | if (jffs2_dataflash(c)) { |
729 | jffs2_dataflash_cleanup(c); |
730 | } |
731 | |
732 | /* and Intel "Sibley" flash */ |
733 | if (jffs2_nor_wbuf_flash(c)) { |
734 | jffs2_nor_wbuf_flash_cleanup(c); |
735 | } |
736 | |
737 | /* and an UBI volume */ |
738 | if (jffs2_ubivol(c)) { |
739 | jffs2_ubivol_cleanup(c); |
740 | } |
741 | } |
742 | |