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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
30static int jffs2_flash_setup(struct jffs2_sb_info *c);
31
32int 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(&dev, 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(f->metadata->size, GFP_USER);
63 if (!mdata) {
64 mutex_unlock(&f->sem);
65 return -ENOMEM;
66 }
67 ret = jffs2_read_dnode(c, f, f->metadata, mdata, 0, mdatalen);
68 if (ret) {
69 mutex_unlock(&f->sem);
70 kfree(mdata);
71 return ret;
72 }
73 mutex_unlock(&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(mdata);
82 return -ENOMEM;
83 }
84
85 ret = jffs2_reserve_space(c, sizeof(*ri) + mdatalen, &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(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
193int 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
210int 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(&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(&c->erase_completion_lock);
231
232 buf->f_bavail = buf->f_bfree = avail >> PAGE_SHIFT;
233
234 return 0;
235}
236
237
238void 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
253struct 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(-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, inode->i_ino, &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, 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, 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, f->metadata, (char *)&jdev, 0, 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(&f->sem);
359
360 jffs2_dbg(1, "jffs2_read_inode() returning\n");
361 unlock_new_inode(inode);
362 return inode;
363
364error_io:
365 ret = -EIO;
366error:
367 mutex_unlock(&f->sem);
368 iget_failed(inode);
369 return ERR_PTR(ret);
370}
371
372void 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);
394}
395
396int 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(&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. */
423struct 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(-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(&f->sem);
462 make_bad_inode(inode);
463 iput(inode);
464 return ERR_PTR(ret);
465 }
466 ret = jffs2_do_new_inode (c, f, mode, ri);
467 if (ret) {
468 mutex_unlock(&f->sem);
469 make_bad_inode(inode);
470 iput(inode);
471 return ERR_PTR(ret);
472 }
473 set_nlink(inode, 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(&f->sem);
486 make_bad_inode(inode);
487 iput(inode);
488 return ERR_PTR(-EINVAL);
489 }
490
491 return inode;
492}
493
494static 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
514int 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(c->flash_size);
565 c->inocache_list = kcalloc(c->inocache_hashsize, 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, 1);
578 if (IS_ERR(root_i)) {
579 jffs2_dbg(1, "get root inode failed\n");
580 ret = PTR_ERR(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
602out_root:
603 jffs2_free_ino_caches(c);
604 jffs2_free_raw_node_refs(c);
605 kvfree(c->blocks);
606 jffs2_clear_xattr_subsystem(c);
607 jffs2_sum_exit(c);
608 out_inohash:
609 kfree(c->inocache_list);
610 out_wbuf:
611 jffs2_flash_cleanup(c);
612
613 return ret;
614}
615
616void jffs2_gc_release_inode(struct jffs2_sb_info *c,
617 struct jffs2_inode_info *f)
618{
619 iput(OFNI_EDONI_2SFFJ(f));
620}
621
622struct 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), inum);
644 if (!inode) {
645 jffs2_dbg(1, "ilookup() failed for ino #%u; inode is probably deleted.\n",
646 inum);
647
648 spin_lock(&c->inocache_lock);
649 ic = jffs2_get_ino_cache(c, inum);
650 if (!ic) {
651 jffs2_dbg(1, "Inode cache for ino #%u is gone\n",
652 inum);
653 spin_unlock(&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(&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), inum);
673 if (IS_ERR(inode))
674 return ERR_CAST(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(-EIO);
682 }
683
684 return JFFS2_INODE_INFO(inode);
685}
686
687static 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
721void 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}
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/fs.h>
19#include <linux/list.h>
20#include <linux/mtd/mtd.h>
21#include <linux/pagemap.h>
22#include <linux/slab.h>
23#include <linux/vmalloc.h>
24#include <linux/vfs.h>
25#include <linux/crc32.h>
26#include "nodelist.h"
27
28static int jffs2_flash_setup(struct jffs2_sb_info *c);
29
30int jffs2_do_setattr (struct inode *inode, struct iattr *iattr)
31{
32 struct jffs2_full_dnode *old_metadata, *new_metadata;
33 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
34 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
35 struct jffs2_raw_inode *ri;
36 union jffs2_device_node dev;
37 unsigned char *mdata = NULL;
38 int mdatalen = 0;
39 unsigned int ivalid;
40 uint32_t alloclen;
41 int ret;
42 int alloc_type = ALLOC_NORMAL;
43
44 jffs2_dbg(1, "%s(): ino #%lu\n", __func__, inode->i_ino);
45
46 /* Special cases - we don't want more than one data node
47 for these types on the medium at any time. So setattr
48 must read the original data associated with the node
49 (i.e. the device numbers or the target name) and write
50 it out again with the appropriate data attached */
51 if (S_ISBLK(inode->i_mode) || S_ISCHR(inode->i_mode)) {
52 /* For these, we don't actually need to read the old node */
53 mdatalen = jffs2_encode_dev(&dev, inode->i_rdev);
54 mdata = (char *)&dev;
55 jffs2_dbg(1, "%s(): Writing %d bytes of kdev_t\n",
56 __func__, mdatalen);
57 } else if (S_ISLNK(inode->i_mode)) {
58 mutex_lock(&f->sem);
59 mdatalen = f->metadata->size;
60 mdata = kmalloc(f->metadata->size, GFP_USER);
61 if (!mdata) {
62 mutex_unlock(&f->sem);
63 return -ENOMEM;
64 }
65 ret = jffs2_read_dnode(c, f, f->metadata, mdata, 0, mdatalen);
66 if (ret) {
67 mutex_unlock(&f->sem);
68 kfree(mdata);
69 return ret;
70 }
71 mutex_unlock(&f->sem);
72 jffs2_dbg(1, "%s(): Writing %d bytes of symlink target\n",
73 __func__, mdatalen);
74 }
75
76 ri = jffs2_alloc_raw_inode();
77 if (!ri) {
78 if (S_ISLNK(inode->i_mode))
79 kfree(mdata);
80 return -ENOMEM;
81 }
82
83 ret = jffs2_reserve_space(c, sizeof(*ri) + mdatalen, &alloclen,
84 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
85 if (ret) {
86 jffs2_free_raw_inode(ri);
87 if (S_ISLNK(inode->i_mode))
88 kfree(mdata);
89 return ret;
90 }
91 mutex_lock(&f->sem);
92 ivalid = iattr->ia_valid;
93
94 ri->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
95 ri->nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE);
96 ri->totlen = cpu_to_je32(sizeof(*ri) + mdatalen);
97 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
98
99 ri->ino = cpu_to_je32(inode->i_ino);
100 ri->version = cpu_to_je32(++f->highest_version);
101
102 ri->uid = cpu_to_je16((ivalid & ATTR_UID)?
103 from_kuid(&init_user_ns, iattr->ia_uid):i_uid_read(inode));
104 ri->gid = cpu_to_je16((ivalid & ATTR_GID)?
105 from_kgid(&init_user_ns, iattr->ia_gid):i_gid_read(inode));
106
107 if (ivalid & ATTR_MODE)
108 ri->mode = cpu_to_jemode(iattr->ia_mode);
109 else
110 ri->mode = cpu_to_jemode(inode->i_mode);
111
112
113 ri->isize = cpu_to_je32((ivalid & ATTR_SIZE)?iattr->ia_size:inode->i_size);
114 ri->atime = cpu_to_je32(I_SEC((ivalid & ATTR_ATIME)?iattr->ia_atime:inode->i_atime));
115 ri->mtime = cpu_to_je32(I_SEC((ivalid & ATTR_MTIME)?iattr->ia_mtime:inode->i_mtime));
116 ri->ctime = cpu_to_je32(I_SEC((ivalid & ATTR_CTIME)?iattr->ia_ctime:inode->i_ctime));
117
118 ri->offset = cpu_to_je32(0);
119 ri->csize = ri->dsize = cpu_to_je32(mdatalen);
120 ri->compr = JFFS2_COMPR_NONE;
121 if (ivalid & ATTR_SIZE && inode->i_size < iattr->ia_size) {
122 /* It's an extension. Make it a hole node */
123 ri->compr = JFFS2_COMPR_ZERO;
124 ri->dsize = cpu_to_je32(iattr->ia_size - inode->i_size);
125 ri->offset = cpu_to_je32(inode->i_size);
126 } else if (ivalid & ATTR_SIZE && !iattr->ia_size) {
127 /* For truncate-to-zero, treat it as deletion because
128 it'll always be obsoleting all previous nodes */
129 alloc_type = ALLOC_DELETION;
130 }
131 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
132 if (mdatalen)
133 ri->data_crc = cpu_to_je32(crc32(0, mdata, mdatalen));
134 else
135 ri->data_crc = cpu_to_je32(0);
136
137 new_metadata = jffs2_write_dnode(c, f, ri, mdata, mdatalen, alloc_type);
138 if (S_ISLNK(inode->i_mode))
139 kfree(mdata);
140
141 if (IS_ERR(new_metadata)) {
142 jffs2_complete_reservation(c);
143 jffs2_free_raw_inode(ri);
144 mutex_unlock(&f->sem);
145 return PTR_ERR(new_metadata);
146 }
147 /* It worked. Update the inode */
148 inode->i_atime = ITIME(je32_to_cpu(ri->atime));
149 inode->i_ctime = ITIME(je32_to_cpu(ri->ctime));
150 inode->i_mtime = ITIME(je32_to_cpu(ri->mtime));
151 inode->i_mode = jemode_to_cpu(ri->mode);
152 i_uid_write(inode, je16_to_cpu(ri->uid));
153 i_gid_write(inode, je16_to_cpu(ri->gid));
154
155
156 old_metadata = f->metadata;
157
158 if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size)
159 jffs2_truncate_fragtree (c, &f->fragtree, iattr->ia_size);
160
161 if (ivalid & ATTR_SIZE && inode->i_size < iattr->ia_size) {
162 jffs2_add_full_dnode_to_inode(c, f, new_metadata);
163 inode->i_size = iattr->ia_size;
164 inode->i_blocks = (inode->i_size + 511) >> 9;
165 f->metadata = NULL;
166 } else {
167 f->metadata = new_metadata;
168 }
169 if (old_metadata) {
170 jffs2_mark_node_obsolete(c, old_metadata->raw);
171 jffs2_free_full_dnode(old_metadata);
172 }
173 jffs2_free_raw_inode(ri);
174
175 mutex_unlock(&f->sem);
176 jffs2_complete_reservation(c);
177
178 /* We have to do the truncate_setsize() without f->sem held, since
179 some pages may be locked and waiting for it in readpage().
180 We are protected from a simultaneous write() extending i_size
181 back past iattr->ia_size, because do_truncate() holds the
182 generic inode semaphore. */
183 if (ivalid & ATTR_SIZE && inode->i_size > iattr->ia_size) {
184 truncate_setsize(inode, iattr->ia_size);
185 inode->i_blocks = (inode->i_size + 511) >> 9;
186 }
187
188 return 0;
189}
190
191int jffs2_setattr(struct dentry *dentry, struct iattr *iattr)
192{
193 struct inode *inode = d_inode(dentry);
194 int rc;
195
196 rc = setattr_prepare(dentry, iattr);
197 if (rc)
198 return rc;
199
200 rc = jffs2_do_setattr(inode, iattr);
201 if (!rc && (iattr->ia_valid & ATTR_MODE))
202 rc = posix_acl_chmod(inode, inode->i_mode);
203
204 return rc;
205}
206
207int jffs2_statfs(struct dentry *dentry, struct kstatfs *buf)
208{
209 struct jffs2_sb_info *c = JFFS2_SB_INFO(dentry->d_sb);
210 unsigned long avail;
211
212 buf->f_type = JFFS2_SUPER_MAGIC;
213 buf->f_bsize = 1 << PAGE_SHIFT;
214 buf->f_blocks = c->flash_size >> PAGE_SHIFT;
215 buf->f_files = 0;
216 buf->f_ffree = 0;
217 buf->f_namelen = JFFS2_MAX_NAME_LEN;
218 buf->f_fsid.val[0] = JFFS2_SUPER_MAGIC;
219 buf->f_fsid.val[1] = c->mtd->index;
220
221 spin_lock(&c->erase_completion_lock);
222 avail = c->dirty_size + c->free_size;
223 if (avail > c->sector_size * c->resv_blocks_write)
224 avail -= c->sector_size * c->resv_blocks_write;
225 else
226 avail = 0;
227 spin_unlock(&c->erase_completion_lock);
228
229 buf->f_bavail = buf->f_bfree = avail >> PAGE_SHIFT;
230
231 return 0;
232}
233
234
235void jffs2_evict_inode (struct inode *inode)
236{
237 /* We can forget about this inode for now - drop all
238 * the nodelists associated with it, etc.
239 */
240 struct jffs2_sb_info *c = JFFS2_SB_INFO(inode->i_sb);
241 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
242
243 jffs2_dbg(1, "%s(): ino #%lu mode %o\n",
244 __func__, inode->i_ino, inode->i_mode);
245 truncate_inode_pages_final(&inode->i_data);
246 clear_inode(inode);
247 jffs2_do_clear_inode(c, f);
248}
249
250struct inode *jffs2_iget(struct super_block *sb, unsigned long ino)
251{
252 struct jffs2_inode_info *f;
253 struct jffs2_sb_info *c;
254 struct jffs2_raw_inode latest_node;
255 union jffs2_device_node jdev;
256 struct inode *inode;
257 dev_t rdev = 0;
258 int ret;
259
260 jffs2_dbg(1, "%s(): ino == %lu\n", __func__, ino);
261
262 inode = iget_locked(sb, ino);
263 if (!inode)
264 return ERR_PTR(-ENOMEM);
265 if (!(inode->i_state & I_NEW))
266 return inode;
267
268 f = JFFS2_INODE_INFO(inode);
269 c = JFFS2_SB_INFO(inode->i_sb);
270
271 jffs2_init_inode_info(f);
272 mutex_lock(&f->sem);
273
274 ret = jffs2_do_read_inode(c, f, inode->i_ino, &latest_node);
275 if (ret)
276 goto error;
277
278 inode->i_mode = jemode_to_cpu(latest_node.mode);
279 i_uid_write(inode, je16_to_cpu(latest_node.uid));
280 i_gid_write(inode, je16_to_cpu(latest_node.gid));
281 inode->i_size = je32_to_cpu(latest_node.isize);
282 inode->i_atime = ITIME(je32_to_cpu(latest_node.atime));
283 inode->i_mtime = ITIME(je32_to_cpu(latest_node.mtime));
284 inode->i_ctime = ITIME(je32_to_cpu(latest_node.ctime));
285
286 set_nlink(inode, f->inocache->pino_nlink);
287
288 inode->i_blocks = (inode->i_size + 511) >> 9;
289
290 switch (inode->i_mode & S_IFMT) {
291
292 case S_IFLNK:
293 inode->i_op = &jffs2_symlink_inode_operations;
294 inode->i_link = f->target;
295 break;
296
297 case S_IFDIR:
298 {
299 struct jffs2_full_dirent *fd;
300 set_nlink(inode, 2); /* parent and '.' */
301
302 for (fd=f->dents; fd; fd = fd->next) {
303 if (fd->type == DT_DIR && fd->ino)
304 inc_nlink(inode);
305 }
306 /* Root dir gets i_nlink 3 for some reason */
307 if (inode->i_ino == 1)
308 inc_nlink(inode);
309
310 inode->i_op = &jffs2_dir_inode_operations;
311 inode->i_fop = &jffs2_dir_operations;
312 break;
313 }
314 case S_IFREG:
315 inode->i_op = &jffs2_file_inode_operations;
316 inode->i_fop = &jffs2_file_operations;
317 inode->i_mapping->a_ops = &jffs2_file_address_operations;
318 inode->i_mapping->nrpages = 0;
319 break;
320
321 case S_IFBLK:
322 case S_IFCHR:
323 /* Read the device numbers from the media */
324 if (f->metadata->size != sizeof(jdev.old_id) &&
325 f->metadata->size != sizeof(jdev.new_id)) {
326 pr_notice("Device node has strange size %d\n",
327 f->metadata->size);
328 goto error_io;
329 }
330 jffs2_dbg(1, "Reading device numbers from flash\n");
331 ret = jffs2_read_dnode(c, f, f->metadata, (char *)&jdev, 0, f->metadata->size);
332 if (ret < 0) {
333 /* Eep */
334 pr_notice("Read device numbers for inode %lu failed\n",
335 (unsigned long)inode->i_ino);
336 goto error;
337 }
338 if (f->metadata->size == sizeof(jdev.old_id))
339 rdev = old_decode_dev(je16_to_cpu(jdev.old_id));
340 else
341 rdev = new_decode_dev(je32_to_cpu(jdev.new_id));
342
343 case S_IFSOCK:
344 case S_IFIFO:
345 inode->i_op = &jffs2_file_inode_operations;
346 init_special_inode(inode, inode->i_mode, rdev);
347 break;
348
349 default:
350 pr_warn("%s(): Bogus i_mode %o for ino %lu\n",
351 __func__, inode->i_mode, (unsigned long)inode->i_ino);
352 }
353
354 mutex_unlock(&f->sem);
355
356 jffs2_dbg(1, "jffs2_read_inode() returning\n");
357 unlock_new_inode(inode);
358 return inode;
359
360error_io:
361 ret = -EIO;
362error:
363 mutex_unlock(&f->sem);
364 jffs2_do_clear_inode(c, f);
365 iget_failed(inode);
366 return ERR_PTR(ret);
367}
368
369void 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
393int 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->s_flags & MS_RDONLY))
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->s_flags & MS_RDONLY)) {
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 & MS_RDONLY))
412 jffs2_start_garbage_collect_thread(c);
413
414 *flags |= MS_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. */
420struct 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
491static 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
511int 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->s_flags & MS_RDONLY))
593 jffs2_start_garbage_collect_thread(c);
594 return 0;
595
596out_root:
597 jffs2_free_ino_caches(c);
598 jffs2_free_raw_node_refs(c);
599 kvfree(c->blocks);
600 out_inohash:
601 jffs2_clear_xattr_subsystem(c);
602 kfree(c->inocache_list);
603 out_wbuf:
604 jffs2_flash_cleanup(c);
605
606 return ret;
607}
608
609void jffs2_gc_release_inode(struct jffs2_sb_info *c,
610 struct jffs2_inode_info *f)
611{
612 iput(OFNI_EDONI_2SFFJ(f));
613}
614
615struct jffs2_inode_info *jffs2_gc_fetch_inode(struct jffs2_sb_info *c,
616 int inum, int unlinked)
617{
618 struct inode *inode;
619 struct jffs2_inode_cache *ic;
620
621 if (unlinked) {
622 /* The inode has zero nlink but its nodes weren't yet marked
623 obsolete. This has to be because we're still waiting for
624 the final (close() and) iput() to happen.
625
626 There's a possibility that the final iput() could have
627 happened while we were contemplating. In order to ensure
628 that we don't cause a new read_inode() (which would fail)
629 for the inode in question, we use ilookup() in this case
630 instead of iget().
631
632 The nlink can't _become_ zero at this point because we're
633 holding the alloc_sem, and jffs2_do_unlink() would also
634 need that while decrementing nlink on any inode.
635 */
636 inode = ilookup(OFNI_BS_2SFFJ(c), inum);
637 if (!inode) {
638 jffs2_dbg(1, "ilookup() failed for ino #%u; inode is probably deleted.\n",
639 inum);
640
641 spin_lock(&c->inocache_lock);
642 ic = jffs2_get_ino_cache(c, inum);
643 if (!ic) {
644 jffs2_dbg(1, "Inode cache for ino #%u is gone\n",
645 inum);
646 spin_unlock(&c->inocache_lock);
647 return NULL;
648 }
649 if (ic->state != INO_STATE_CHECKEDABSENT) {
650 /* Wait for progress. Don't just loop */
651 jffs2_dbg(1, "Waiting for ino #%u in state %d\n",
652 ic->ino, ic->state);
653 sleep_on_spinunlock(&c->inocache_wq, &c->inocache_lock);
654 } else {
655 spin_unlock(&c->inocache_lock);
656 }
657
658 return NULL;
659 }
660 } else {
661 /* Inode has links to it still; they're not going away because
662 jffs2_do_unlink() would need the alloc_sem and we have it.
663 Just iget() it, and if read_inode() is necessary that's OK.
664 */
665 inode = jffs2_iget(OFNI_BS_2SFFJ(c), inum);
666 if (IS_ERR(inode))
667 return ERR_CAST(inode);
668 }
669 if (is_bad_inode(inode)) {
670 pr_notice("Eep. read_inode() failed for ino #%u. unlinked %d\n",
671 inum, unlinked);
672 /* NB. This will happen again. We need to do something appropriate here. */
673 iput(inode);
674 return ERR_PTR(-EIO);
675 }
676
677 return JFFS2_INODE_INFO(inode);
678}
679
680unsigned char *jffs2_gc_fetch_page(struct jffs2_sb_info *c,
681 struct jffs2_inode_info *f,
682 unsigned long offset,
683 unsigned long *priv)
684{
685 struct inode *inode = OFNI_EDONI_2SFFJ(f);
686 struct page *pg;
687
688 pg = read_cache_page(inode->i_mapping, offset >> PAGE_SHIFT,
689 (void *)jffs2_do_readpage_unlock, inode);
690 if (IS_ERR(pg))
691 return (void *)pg;
692
693 *priv = (unsigned long)pg;
694 return kmap(pg);
695}
696
697void jffs2_gc_release_page(struct jffs2_sb_info *c,
698 unsigned char *ptr,
699 unsigned long *priv)
700{
701 struct page *pg = (void *)*priv;
702
703 kunmap(pg);
704 put_page(pg);
705}
706
707static int jffs2_flash_setup(struct jffs2_sb_info *c) {
708 int ret = 0;
709
710 if (jffs2_cleanmarker_oob(c)) {
711 /* NAND flash... do setup accordingly */
712 ret = jffs2_nand_flash_setup(c);
713 if (ret)
714 return ret;
715 }
716
717 /* and Dataflash */
718 if (jffs2_dataflash(c)) {
719 ret = jffs2_dataflash_setup(c);
720 if (ret)
721 return ret;
722 }
723
724 /* and Intel "Sibley" flash */
725 if (jffs2_nor_wbuf_flash(c)) {
726 ret = jffs2_nor_wbuf_flash_setup(c);
727 if (ret)
728 return ret;
729 }
730
731 /* and an UBI volume */
732 if (jffs2_ubivol(c)) {
733 ret = jffs2_ubivol_setup(c);
734 if (ret)
735 return ret;
736 }
737
738 return ret;
739}
740
741void jffs2_flash_cleanup(struct jffs2_sb_info *c) {
742
743 if (jffs2_cleanmarker_oob(c)) {
744 jffs2_nand_flash_cleanup(c);
745 }
746
747 /* and DataFlash */
748 if (jffs2_dataflash(c)) {
749 jffs2_dataflash_cleanup(c);
750 }
751
752 /* and Intel "Sibley" flash */
753 if (jffs2_nor_wbuf_flash(c)) {
754 jffs2_nor_wbuf_flash_cleanup(c);
755 }
756
757 /* and an UBI volume */
758 if (jffs2_ubivol(c)) {
759 jffs2_ubivol_cleanup(c);
760 }
761}