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/list.h>
21 #include <linux/mtd/mtd.h>
22 #include <linux/pagemap.h>
23 #include <linux/slab.h>
24 #include <linux/vmalloc.h>
25 #include <linux/vfs.h>
26 #include <linux/crc32.h>
27 #include "nodelist.h"
28
29 static int jffs2_flash_setup(struct jffs2_sb_info *c);
30
jffs2_do_setattr(struct inode * inode,struct iattr * iattr)31 int jffs2_do_setattr (struct inode *inode, struct iattr *iattr)
32 {
33 struct jffs2_full_dnode *old_metadata, *new_metadata;
34 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
35 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
36 struct jffs2_raw_inode *ri;
37 union jffs2_device_node dev;
38 unsigned char *mdata = NULL;
39 int mdatalen = 0;
40 unsigned int ivalid;
41 uint32_t alloclen;
42 int ret;
43 int alloc_type = ALLOC_NORMAL;
44
45 jffs2_dbg(1, "%s(): ino #%lu\n", __func__, inode->i_ino);
46
47 /* Special cases - we don't want more than one data node
48 for these types on the medium at any time. So setattr
49 must read the original data associated with the node
50 (i.e. the device numbers or the target name) and write
51 it out again with the appropriate data attached */
52 if (S_ISBLK(inode->i_mode) || S_ISCHR(inode->i_mode)) {
53 /* For these, we don't actually need to read the old node */
54 mdatalen = jffs2_encode_dev(&dev, inode->i_rdev);
55 mdata = (char *)&dev;
56 jffs2_dbg(1, "%s(): Writing %d bytes of kdev_t\n",
57 __func__, mdatalen);
58 } else if (S_ISLNK(inode->i_mode)) {
59 mutex_lock(&f->sem);
60 mdatalen = f->metadata->size;
61 mdata = kmalloc(f->metadata->size, GFP_USER);
62 if (!mdata) {
63 mutex_unlock(&f->sem);
64 return -ENOMEM;
65 }
66 ret = jffs2_read_dnode(c, f, f->metadata, mdata, 0, mdatalen);
67 if (ret) {
68 mutex_unlock(&f->sem);
69 kfree(mdata);
70 return ret;
71 }
72 mutex_unlock(&f->sem);
73 jffs2_dbg(1, "%s(): Writing %d bytes of symlink target\n",
74 __func__, mdatalen);
75 }
76
77 ri = jffs2_alloc_raw_inode();
78 if (!ri) {
79 if (S_ISLNK(inode->i_mode))
80 kfree(mdata);
81 return -ENOMEM;
82 }
83
84 ret = jffs2_reserve_space(c, sizeof(*ri) + mdatalen, &alloclen,
85 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
86 if (ret) {
87 jffs2_free_raw_inode(ri);
88 if (S_ISLNK(inode->i_mode))
89 kfree(mdata);
90 return ret;
91 }
92 mutex_lock(&f->sem);
93 ivalid = iattr->ia_valid;
94
95 ri->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
96 ri->nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE);
97 ri->totlen = cpu_to_je32(sizeof(*ri) + mdatalen);
98 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
99
100 ri->ino = cpu_to_je32(inode->i_ino);
101 ri->version = cpu_to_je32(++f->highest_version);
102
103 ri->uid = cpu_to_je16((ivalid & ATTR_UID)?
104 from_kuid(&init_user_ns, iattr->ia_uid):i_uid_read(inode));
105 ri->gid = cpu_to_je16((ivalid & ATTR_GID)?
106 from_kgid(&init_user_ns, iattr->ia_gid):i_gid_read(inode));
107
108 if (ivalid & ATTR_MODE)
109 ri->mode = cpu_to_jemode(iattr->ia_mode);
110 else
111 ri->mode = cpu_to_jemode(inode->i_mode);
112
113
114 ri->isize = cpu_to_je32((ivalid & ATTR_SIZE)?iattr->ia_size:inode->i_size);
115 ri->atime = cpu_to_je32(I_SEC((ivalid & ATTR_ATIME)?iattr->ia_atime:inode->i_atime));
116 ri->mtime = cpu_to_je32(I_SEC((ivalid & ATTR_MTIME)?iattr->ia_mtime:inode->i_mtime));
117 ri->ctime = cpu_to_je32(I_SEC((ivalid & ATTR_CTIME)?iattr->ia_ctime:inode->i_ctime));
118
119 ri->offset = cpu_to_je32(0);
120 ri->csize = ri->dsize = cpu_to_je32(mdatalen);
121 ri->compr = JFFS2_COMPR_NONE;
122 if (ivalid & ATTR_SIZE && inode->i_size < iattr->ia_size) {
123 /* It's an extension. Make it a hole node */
124 ri->compr = JFFS2_COMPR_ZERO;
125 ri->dsize = cpu_to_je32(iattr->ia_size - inode->i_size);
126 ri->offset = cpu_to_je32(inode->i_size);
127 } else if (ivalid & ATTR_SIZE && !iattr->ia_size) {
128 /* For truncate-to-zero, treat it as deletion because
129 it'll always be obsoleting all previous nodes */
130 alloc_type = ALLOC_DELETION;
131 }
132 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
133 if (mdatalen)
134 ri->data_crc = cpu_to_je32(crc32(0, mdata, mdatalen));
135 else
136 ri->data_crc = cpu_to_je32(0);
137
138 new_metadata = jffs2_write_dnode(c, f, ri, mdata, mdatalen, alloc_type);
139 if (S_ISLNK(inode->i_mode))
140 kfree(mdata);
141
142 if (IS_ERR(new_metadata)) {
143 jffs2_complete_reservation(c);
144 jffs2_free_raw_inode(ri);
145 mutex_unlock(&f->sem);
146 return PTR_ERR(new_metadata);
147 }
148 /* It worked. Update the inode */
149 inode->i_atime = ITIME(je32_to_cpu(ri->atime));
150 inode->i_ctime = ITIME(je32_to_cpu(ri->ctime));
151 inode->i_mtime = ITIME(je32_to_cpu(ri->mtime));
152 inode->i_mode = jemode_to_cpu(ri->mode);
153 i_uid_write(inode, je16_to_cpu(ri->uid));
154 i_gid_write(inode, je16_to_cpu(ri->gid));
155
156
157 old_metadata = f->metadata;
158
159 if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size)
160 jffs2_truncate_fragtree (c, &f->fragtree, iattr->ia_size);
161
162 if (ivalid & ATTR_SIZE && inode->i_size < iattr->ia_size) {
163 jffs2_add_full_dnode_to_inode(c, f, new_metadata);
164 inode->i_size = iattr->ia_size;
165 inode->i_blocks = (inode->i_size + 511) >> 9;
166 f->metadata = NULL;
167 } else {
168 f->metadata = new_metadata;
169 }
170 if (old_metadata) {
171 jffs2_mark_node_obsolete(c, old_metadata->raw);
172 jffs2_free_full_dnode(old_metadata);
173 }
174 jffs2_free_raw_inode(ri);
175
176 mutex_unlock(&f->sem);
177 jffs2_complete_reservation(c);
178
179 /* We have to do the truncate_setsize() without f->sem held, since
180 some pages may be locked and waiting for it in readpage().
181 We are protected from a simultaneous write() extending i_size
182 back past iattr->ia_size, because do_truncate() holds the
183 generic inode semaphore. */
184 if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size) {
185 truncate_setsize(inode, iattr->ia_size);
186 inode->i_blocks = (inode->i_size + 511) >> 9;
187 }
188
189 return 0;
190 }
191
jffs2_setattr(struct dentry * dentry,struct iattr * iattr)192 int jffs2_setattr(struct dentry *dentry, struct iattr *iattr)
193 {
194 struct inode *inode = d_inode(dentry);
195 int rc;
196
197 rc = setattr_prepare(dentry, iattr);
198 if (rc)
199 return rc;
200
201 rc = jffs2_do_setattr(inode, iattr);
202 if (!rc && (iattr->ia_valid & ATTR_MODE))
203 rc = posix_acl_chmod(inode, inode->i_mode);
204
205 return rc;
206 }
207
jffs2_statfs(struct dentry * dentry,struct kstatfs * buf)208 int jffs2_statfs(struct dentry *dentry, struct kstatfs *buf)
209 {
210 struct jffs2_sb_info *c = JFFS2_SB_INFO(dentry->d_sb);
211 unsigned long avail;
212
213 buf->f_type = JFFS2_SUPER_MAGIC;
214 buf->f_bsize = 1 << PAGE_SHIFT;
215 buf->f_blocks = c->flash_size >> PAGE_SHIFT;
216 buf->f_files = 0;
217 buf->f_ffree = 0;
218 buf->f_namelen = JFFS2_MAX_NAME_LEN;
219 buf->f_fsid.val[0] = JFFS2_SUPER_MAGIC;
220 buf->f_fsid.val[1] = c->mtd->index;
221
222 spin_lock(&c->erase_completion_lock);
223 avail = c->dirty_size + c->free_size;
224 if (avail > c->sector_size * c->resv_blocks_write)
225 avail -= c->sector_size * c->resv_blocks_write;
226 else
227 avail = 0;
228 spin_unlock(&c->erase_completion_lock);
229
230 buf->f_bavail = buf->f_bfree = avail >> PAGE_SHIFT;
231
232 return 0;
233 }
234
235
jffs2_evict_inode(struct inode * inode)236 void jffs2_evict_inode (struct inode *inode)
237 {
238 /* We can forget about this inode for now - drop all
239 * the nodelists associated with it, etc.
240 */
241 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
242 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
243
244 jffs2_dbg(1, "%s(): ino #%lu mode %o\n",
245 __func__, inode->i_ino, inode->i_mode);
246 truncate_inode_pages_final(&inode->i_data);
247 clear_inode(inode);
248 jffs2_do_clear_inode(c, f);
249 }
250
jffs2_iget(struct super_block * sb,unsigned long ino)251 struct inode *jffs2_iget(struct super_block *sb, unsigned long ino)
252 {
253 struct jffs2_inode_info *f;
254 struct jffs2_sb_info *c;
255 struct jffs2_raw_inode latest_node;
256 union jffs2_device_node jdev;
257 struct inode *inode;
258 dev_t rdev = 0;
259 int ret;
260
261 jffs2_dbg(1, "%s(): ino == %lu\n", __func__, ino);
262
263 inode = iget_locked(sb, ino);
264 if (!inode)
265 return ERR_PTR(-ENOMEM);
266 if (!(inode->i_state & I_NEW))
267 return inode;
268
269 f = JFFS2_INODE_INFO(inode);
270 c = JFFS2_SB_INFO(inode->i_sb);
271
272 jffs2_init_inode_info(f);
273 mutex_lock(&f->sem);
274
275 ret = jffs2_do_read_inode(c, f, inode->i_ino, &latest_node);
276 if (ret)
277 goto error;
278
279 inode->i_mode = jemode_to_cpu(latest_node.mode);
280 i_uid_write(inode, je16_to_cpu(latest_node.uid));
281 i_gid_write(inode, je16_to_cpu(latest_node.gid));
282 inode->i_size = je32_to_cpu(latest_node.isize);
283 inode->i_atime = ITIME(je32_to_cpu(latest_node.atime));
284 inode->i_mtime = ITIME(je32_to_cpu(latest_node.mtime));
285 inode->i_ctime = ITIME(je32_to_cpu(latest_node.ctime));
286
287 set_nlink(inode, f->inocache->pino_nlink);
288
289 inode->i_blocks = (inode->i_size + 511) >> 9;
290
291 switch (inode->i_mode & S_IFMT) {
292
293 case S_IFLNK:
294 inode->i_op = &jffs2_symlink_inode_operations;
295 inode->i_link = f->target;
296 break;
297
298 case S_IFDIR:
299 {
300 struct jffs2_full_dirent *fd;
301 set_nlink(inode, 2); /* parent and '.' */
302
303 for (fd=f->dents; fd; fd = fd->next) {
304 if (fd->type == DT_DIR && fd->ino)
305 inc_nlink(inode);
306 }
307 /* Root dir gets i_nlink 3 for some reason */
308 if (inode->i_ino == 1)
309 inc_nlink(inode);
310
311 inode->i_op = &jffs2_dir_inode_operations;
312 inode->i_fop = &jffs2_dir_operations;
313 break;
314 }
315 case S_IFREG:
316 inode->i_op = &jffs2_file_inode_operations;
317 inode->i_fop = &jffs2_file_operations;
318 inode->i_mapping->a_ops = &jffs2_file_address_operations;
319 inode->i_mapping->nrpages = 0;
320 break;
321
322 case S_IFBLK:
323 case S_IFCHR:
324 /* Read the device numbers from the media */
325 if (f->metadata->size != sizeof(jdev.old_id) &&
326 f->metadata->size != sizeof(jdev.new_id)) {
327 pr_notice("Device node has strange size %d\n",
328 f->metadata->size);
329 goto error_io;
330 }
331 jffs2_dbg(1, "Reading device numbers from flash\n");
332 ret = jffs2_read_dnode(c, f, f->metadata, (char *)&jdev, 0, f->metadata->size);
333 if (ret < 0) {
334 /* Eep */
335 pr_notice("Read device numbers for inode %lu failed\n",
336 (unsigned long)inode->i_ino);
337 goto error;
338 }
339 if (f->metadata->size == sizeof(jdev.old_id))
340 rdev = old_decode_dev(je16_to_cpu(jdev.old_id));
341 else
342 rdev = new_decode_dev(je32_to_cpu(jdev.new_id));
343
344 case S_IFSOCK:
345 case S_IFIFO:
346 inode->i_op = &jffs2_file_inode_operations;
347 init_special_inode(inode, inode->i_mode, rdev);
348 break;
349
350 default:
351 pr_warn("%s(): Bogus i_mode %o for ino %lu\n",
352 __func__, inode->i_mode, (unsigned long)inode->i_ino);
353 }
354
355 mutex_unlock(&f->sem);
356
357 jffs2_dbg(1, "jffs2_read_inode() returning\n");
358 unlock_new_inode(inode);
359 return inode;
360
361 error_io:
362 ret = -EIO;
363 error:
364 mutex_unlock(&f->sem);
365 iget_failed(inode);
366 return ERR_PTR(ret);
367 }
368
jffs2_dirty_inode(struct inode * inode,int flags)369 void jffs2_dirty_inode(struct inode *inode, int flags)
370 {
371 struct iattr iattr;
372
373 if (!(inode->i_state & I_DIRTY_DATASYNC)) {
374 jffs2_dbg(2, "%s(): not calling setattr() for ino #%lu\n",
375 __func__, inode->i_ino);
376 return;
377 }
378
379 jffs2_dbg(1, "%s(): calling setattr() for ino #%lu\n",
380 __func__, inode->i_ino);
381
382 iattr.ia_valid = ATTR_MODE|ATTR_UID|ATTR_GID|ATTR_ATIME|ATTR_MTIME|ATTR_CTIME;
383 iattr.ia_mode = inode->i_mode;
384 iattr.ia_uid = inode->i_uid;
385 iattr.ia_gid = inode->i_gid;
386 iattr.ia_atime = inode->i_atime;
387 iattr.ia_mtime = inode->i_mtime;
388 iattr.ia_ctime = inode->i_ctime;
389
390 jffs2_do_setattr(inode, &iattr);
391 }
392
jffs2_do_remount_fs(struct super_block * sb,int * flags,char * data)393 int jffs2_do_remount_fs(struct super_block *sb, int *flags, char *data)
394 {
395 struct jffs2_sb_info *c = JFFS2_SB_INFO(sb);
396
397 if (c->flags & JFFS2_SB_FLAG_RO && !sb_rdonly(sb))
398 return -EROFS;
399
400 /* We stop if it was running, then restart if it needs to.
401 This also catches the case where it was stopped and this
402 is just a remount to restart it.
403 Flush the writebuffer, if neccecary, else we loose it */
404 if (!sb_rdonly(sb)) {
405 jffs2_stop_garbage_collect_thread(c);
406 mutex_lock(&c->alloc_sem);
407 jffs2_flush_wbuf_pad(c);
408 mutex_unlock(&c->alloc_sem);
409 }
410
411 if (!(*flags & SB_RDONLY))
412 jffs2_start_garbage_collect_thread(c);
413
414 *flags |= SB_NOATIME;
415 return 0;
416 }
417
418 /* jffs2_new_inode: allocate a new inode and inocache, add it to the hash,
419 fill in the raw_inode while you're at it. */
jffs2_new_inode(struct inode * dir_i,umode_t mode,struct jffs2_raw_inode * ri)420 struct inode *jffs2_new_inode (struct inode *dir_i, umode_t mode, struct jffs2_raw_inode *ri)
421 {
422 struct inode *inode;
423 struct super_block *sb = dir_i->i_sb;
424 struct jffs2_sb_info *c;
425 struct jffs2_inode_info *f;
426 int ret;
427
428 jffs2_dbg(1, "%s(): dir_i %ld, mode 0x%x\n",
429 __func__, dir_i->i_ino, mode);
430
431 c = JFFS2_SB_INFO(sb);
432
433 inode = new_inode(sb);
434
435 if (!inode)
436 return ERR_PTR(-ENOMEM);
437
438 f = JFFS2_INODE_INFO(inode);
439 jffs2_init_inode_info(f);
440 mutex_lock(&f->sem);
441
442 memset(ri, 0, sizeof(*ri));
443 /* Set OS-specific defaults for new inodes */
444 ri->uid = cpu_to_je16(from_kuid(&init_user_ns, current_fsuid()));
445
446 if (dir_i->i_mode & S_ISGID) {
447 ri->gid = cpu_to_je16(i_gid_read(dir_i));
448 if (S_ISDIR(mode))
449 mode |= S_ISGID;
450 } else {
451 ri->gid = cpu_to_je16(from_kgid(&init_user_ns, current_fsgid()));
452 }
453
454 /* POSIX ACLs have to be processed now, at least partly.
455 The umask is only applied if there's no default ACL */
456 ret = jffs2_init_acl_pre(dir_i, inode, &mode);
457 if (ret) {
458 mutex_unlock(&f->sem);
459 make_bad_inode(inode);
460 iput(inode);
461 return ERR_PTR(ret);
462 }
463 ret = jffs2_do_new_inode (c, f, mode, ri);
464 if (ret) {
465 mutex_unlock(&f->sem);
466 make_bad_inode(inode);
467 iput(inode);
468 return ERR_PTR(ret);
469 }
470 set_nlink(inode, 1);
471 inode->i_ino = je32_to_cpu(ri->ino);
472 inode->i_mode = jemode_to_cpu(ri->mode);
473 i_gid_write(inode, je16_to_cpu(ri->gid));
474 i_uid_write(inode, je16_to_cpu(ri->uid));
475 inode->i_atime = inode->i_ctime = inode->i_mtime = current_time(inode);
476 ri->atime = ri->mtime = ri->ctime = cpu_to_je32(I_SEC(inode->i_mtime));
477
478 inode->i_blocks = 0;
479 inode->i_size = 0;
480
481 if (insert_inode_locked(inode) < 0) {
482 mutex_unlock(&f->sem);
483 make_bad_inode(inode);
484 iput(inode);
485 return ERR_PTR(-EINVAL);
486 }
487
488 return inode;
489 }
490
calculate_inocache_hashsize(uint32_t flash_size)491 static int calculate_inocache_hashsize(uint32_t flash_size)
492 {
493 /*
494 * Pick a inocache hash size based on the size of the medium.
495 * Count how many megabytes we're dealing with, apply a hashsize twice
496 * that size, but rounding down to the usual big powers of 2. And keep
497 * to sensible bounds.
498 */
499
500 int size_mb = flash_size / 1024 / 1024;
501 int hashsize = (size_mb * 2) & ~0x3f;
502
503 if (hashsize < INOCACHE_HASHSIZE_MIN)
504 return INOCACHE_HASHSIZE_MIN;
505 if (hashsize > INOCACHE_HASHSIZE_MAX)
506 return INOCACHE_HASHSIZE_MAX;
507
508 return hashsize;
509 }
510
jffs2_do_fill_super(struct super_block * sb,void * data,int silent)511 int jffs2_do_fill_super(struct super_block *sb, void *data, int silent)
512 {
513 struct jffs2_sb_info *c;
514 struct inode *root_i;
515 int ret;
516 size_t blocks;
517
518 c = JFFS2_SB_INFO(sb);
519
520 /* Do not support the MLC nand */
521 if (c->mtd->type == MTD_MLCNANDFLASH)
522 return -EINVAL;
523
524 #ifndef CONFIG_JFFS2_FS_WRITEBUFFER
525 if (c->mtd->type == MTD_NANDFLASH) {
526 pr_err("Cannot operate on NAND flash unless jffs2 NAND support is compiled in\n");
527 return -EINVAL;
528 }
529 if (c->mtd->type == MTD_DATAFLASH) {
530 pr_err("Cannot operate on DataFlash unless jffs2 DataFlash support is compiled in\n");
531 return -EINVAL;
532 }
533 #endif
534
535 c->flash_size = c->mtd->size;
536 c->sector_size = c->mtd->erasesize;
537 blocks = c->flash_size / c->sector_size;
538
539 /*
540 * Size alignment check
541 */
542 if ((c->sector_size * blocks) != c->flash_size) {
543 c->flash_size = c->sector_size * blocks;
544 pr_info("Flash size not aligned to erasesize, reducing to %dKiB\n",
545 c->flash_size / 1024);
546 }
547
548 if (c->flash_size < 5*c->sector_size) {
549 pr_err("Too few erase blocks (%d)\n",
550 c->flash_size / c->sector_size);
551 return -EINVAL;
552 }
553
554 c->cleanmarker_size = sizeof(struct jffs2_unknown_node);
555
556 /* NAND (or other bizarre) flash... do setup accordingly */
557 ret = jffs2_flash_setup(c);
558 if (ret)
559 return ret;
560
561 c->inocache_hashsize = calculate_inocache_hashsize(c->flash_size);
562 c->inocache_list = kcalloc(c->inocache_hashsize, sizeof(struct jffs2_inode_cache *), GFP_KERNEL);
563 if (!c->inocache_list) {
564 ret = -ENOMEM;
565 goto out_wbuf;
566 }
567
568 jffs2_init_xattr_subsystem(c);
569
570 if ((ret = jffs2_do_mount_fs(c)))
571 goto out_inohash;
572
573 jffs2_dbg(1, "%s(): Getting root inode\n", __func__);
574 root_i = jffs2_iget(sb, 1);
575 if (IS_ERR(root_i)) {
576 jffs2_dbg(1, "get root inode failed\n");
577 ret = PTR_ERR(root_i);
578 goto out_root;
579 }
580
581 ret = -ENOMEM;
582
583 jffs2_dbg(1, "%s(): d_make_root()\n", __func__);
584 sb->s_root = d_make_root(root_i);
585 if (!sb->s_root)
586 goto out_root;
587
588 sb->s_maxbytes = 0xFFFFFFFF;
589 sb->s_blocksize = PAGE_SIZE;
590 sb->s_blocksize_bits = PAGE_SHIFT;
591 sb->s_magic = JFFS2_SUPER_MAGIC;
592 if (!sb_rdonly(sb))
593 jffs2_start_garbage_collect_thread(c);
594 return 0;
595
596 out_root:
597 jffs2_free_ino_caches(c);
598 jffs2_free_raw_node_refs(c);
599 kvfree(c->blocks);
600 jffs2_clear_xattr_subsystem(c);
601 jffs2_sum_exit(c);
602 out_inohash:
603 kfree(c->inocache_list);
604 out_wbuf:
605 jffs2_flash_cleanup(c);
606
607 return ret;
608 }
609
jffs2_gc_release_inode(struct jffs2_sb_info * c,struct jffs2_inode_info * f)610 void jffs2_gc_release_inode(struct jffs2_sb_info *c,
611 struct jffs2_inode_info *f)
612 {
613 iput(OFNI_EDONI_2SFFJ(f));
614 }
615
jffs2_gc_fetch_inode(struct jffs2_sb_info * c,int inum,int unlinked)616 struct jffs2_inode_info *jffs2_gc_fetch_inode(struct jffs2_sb_info *c,
617 int inum, int unlinked)
618 {
619 struct inode *inode;
620 struct jffs2_inode_cache *ic;
621
622 if (unlinked) {
623 /* The inode has zero nlink but its nodes weren't yet marked
624 obsolete. This has to be because we're still waiting for
625 the final (close() and) iput() to happen.
626
627 There's a possibility that the final iput() could have
628 happened while we were contemplating. In order to ensure
629 that we don't cause a new read_inode() (which would fail)
630 for the inode in question, we use ilookup() in this case
631 instead of iget().
632
633 The nlink can't _become_ zero at this point because we're
634 holding the alloc_sem, and jffs2_do_unlink() would also
635 need that while decrementing nlink on any inode.
636 */
637 inode = ilookup(OFNI_BS_2SFFJ(c), inum);
638 if (!inode) {
639 jffs2_dbg(1, "ilookup() failed for ino #%u; inode is probably deleted.\n",
640 inum);
641
642 spin_lock(&c->inocache_lock);
643 ic = jffs2_get_ino_cache(c, inum);
644 if (!ic) {
645 jffs2_dbg(1, "Inode cache for ino #%u is gone\n",
646 inum);
647 spin_unlock(&c->inocache_lock);
648 return NULL;
649 }
650 if (ic->state != INO_STATE_CHECKEDABSENT) {
651 /* Wait for progress. Don't just loop */
652 jffs2_dbg(1, "Waiting for ino #%u in state %d\n",
653 ic->ino, ic->state);
654 sleep_on_spinunlock(&c->inocache_wq, &c->inocache_lock);
655 } else {
656 spin_unlock(&c->inocache_lock);
657 }
658
659 return NULL;
660 }
661 } else {
662 /* Inode has links to it still; they're not going away because
663 jffs2_do_unlink() would need the alloc_sem and we have it.
664 Just iget() it, and if read_inode() is necessary that's OK.
665 */
666 inode = jffs2_iget(OFNI_BS_2SFFJ(c), inum);
667 if (IS_ERR(inode))
668 return ERR_CAST(inode);
669 }
670 if (is_bad_inode(inode)) {
671 pr_notice("Eep. read_inode() failed for ino #%u. unlinked %d\n",
672 inum, unlinked);
673 /* NB. This will happen again. We need to do something appropriate here. */
674 iput(inode);
675 return ERR_PTR(-EIO);
676 }
677
678 return JFFS2_INODE_INFO(inode);
679 }
680
jffs2_gc_fetch_page(struct jffs2_sb_info * c,struct jffs2_inode_info * f,unsigned long offset,unsigned long * priv)681 unsigned char *jffs2_gc_fetch_page(struct jffs2_sb_info *c,
682 struct jffs2_inode_info *f,
683 unsigned long offset,
684 unsigned long *priv)
685 {
686 struct inode *inode = OFNI_EDONI_2SFFJ(f);
687 struct page *pg;
688
689 pg = read_cache_page(inode->i_mapping, offset >> PAGE_SHIFT,
690 (void *)jffs2_do_readpage_unlock, inode);
691 if (IS_ERR(pg))
692 return (void *)pg;
693
694 *priv = (unsigned long)pg;
695 return kmap(pg);
696 }
697
jffs2_gc_release_page(struct jffs2_sb_info * c,unsigned char * ptr,unsigned long * priv)698 void jffs2_gc_release_page(struct jffs2_sb_info *c,
699 unsigned char *ptr,
700 unsigned long *priv)
701 {
702 struct page *pg = (void *)*priv;
703
704 kunmap(pg);
705 put_page(pg);
706 }
707
jffs2_flash_setup(struct jffs2_sb_info * c)708 static int jffs2_flash_setup(struct jffs2_sb_info *c) {
709 int ret = 0;
710
711 if (jffs2_cleanmarker_oob(c)) {
712 /* NAND flash... do setup accordingly */
713 ret = jffs2_nand_flash_setup(c);
714 if (ret)
715 return ret;
716 }
717
718 /* and Dataflash */
719 if (jffs2_dataflash(c)) {
720 ret = jffs2_dataflash_setup(c);
721 if (ret)
722 return ret;
723 }
724
725 /* and Intel "Sibley" flash */
726 if (jffs2_nor_wbuf_flash(c)) {
727 ret = jffs2_nor_wbuf_flash_setup(c);
728 if (ret)
729 return ret;
730 }
731
732 /* and an UBI volume */
733 if (jffs2_ubivol(c)) {
734 ret = jffs2_ubivol_setup(c);
735 if (ret)
736 return ret;
737 }
738
739 return ret;
740 }
741
jffs2_flash_cleanup(struct jffs2_sb_info * c)742 void jffs2_flash_cleanup(struct jffs2_sb_info *c) {
743
744 if (jffs2_cleanmarker_oob(c)) {
745 jffs2_nand_flash_cleanup(c);
746 }
747
748 /* and DataFlash */
749 if (jffs2_dataflash(c)) {
750 jffs2_dataflash_cleanup(c);
751 }
752
753 /* and Intel "Sibley" flash */
754 if (jffs2_nor_wbuf_flash(c)) {
755 jffs2_nor_wbuf_flash_cleanup(c);
756 }
757
758 /* and an UBI volume */
759 if (jffs2_ubivol(c)) {
760 jffs2_ubivol_cleanup(c);
761 }
762 }
763