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 #define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
13
14 #include <linux/kernel.h>
15 #include <linux/fs.h>
16 #include <linux/crc32.h>
17 #include <linux/pagemap.h>
18 #include <linux/mtd/mtd.h>
19 #include "nodelist.h"
20 #include "compr.h"
21
22
jffs2_do_new_inode(struct jffs2_sb_info * c,struct jffs2_inode_info * f,uint32_t mode,struct jffs2_raw_inode * ri)23 int jffs2_do_new_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
24 uint32_t mode, struct jffs2_raw_inode *ri)
25 {
26 struct jffs2_inode_cache *ic;
27
28 ic = jffs2_alloc_inode_cache();
29 if (!ic) {
30 return -ENOMEM;
31 }
32
33 memset(ic, 0, sizeof(*ic));
34
35 f->inocache = ic;
36 f->inocache->pino_nlink = 1; /* Will be overwritten shortly for directories */
37 f->inocache->nodes = (struct jffs2_raw_node_ref *)f->inocache;
38 f->inocache->state = INO_STATE_PRESENT;
39
40 jffs2_add_ino_cache(c, f->inocache);
41 jffs2_dbg(1, "%s(): Assigned ino# %d\n", __func__, f->inocache->ino);
42 ri->ino = cpu_to_je32(f->inocache->ino);
43
44 ri->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
45 ri->nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE);
46 ri->totlen = cpu_to_je32(PAD(sizeof(*ri)));
47 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
48 ri->mode = cpu_to_jemode(mode);
49
50 f->highest_version = 1;
51 ri->version = cpu_to_je32(f->highest_version);
52
53 return 0;
54 }
55
56 /* jffs2_write_dnode - given a raw_inode, allocate a full_dnode for it,
57 write it to the flash, link it into the existing inode/fragment list */
58
jffs2_write_dnode(struct jffs2_sb_info * c,struct jffs2_inode_info * f,struct jffs2_raw_inode * ri,const unsigned char * data,uint32_t datalen,int alloc_mode)59 struct jffs2_full_dnode *jffs2_write_dnode(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
60 struct jffs2_raw_inode *ri, const unsigned char *data,
61 uint32_t datalen, int alloc_mode)
62
63 {
64 struct jffs2_full_dnode *fn;
65 size_t retlen;
66 uint32_t flash_ofs;
67 struct kvec vecs[2];
68 int ret;
69 int retried = 0;
70 unsigned long cnt = 2;
71
72 D1(if(je32_to_cpu(ri->hdr_crc) != crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)) {
73 pr_crit("Eep. CRC not correct in jffs2_write_dnode()\n");
74 BUG();
75 }
76 );
77 vecs[0].iov_base = ri;
78 vecs[0].iov_len = sizeof(*ri);
79 vecs[1].iov_base = (unsigned char *)data;
80 vecs[1].iov_len = datalen;
81
82 if (je32_to_cpu(ri->totlen) != sizeof(*ri) + datalen) {
83 pr_warn("%s(): ri->totlen (0x%08x) != sizeof(*ri) (0x%08zx) + datalen (0x%08x)\n",
84 __func__, je32_to_cpu(ri->totlen),
85 sizeof(*ri), datalen);
86 }
87
88 fn = jffs2_alloc_full_dnode();
89 if (!fn)
90 return ERR_PTR(-ENOMEM);
91
92 /* check number of valid vecs */
93 if (!datalen || !data)
94 cnt = 1;
95 retry:
96 flash_ofs = write_ofs(c);
97
98 jffs2_dbg_prewrite_paranoia_check(c, flash_ofs, vecs[0].iov_len + vecs[1].iov_len);
99
100 if ((alloc_mode!=ALLOC_GC) && (je32_to_cpu(ri->version) < f->highest_version)) {
101 BUG_ON(!retried);
102 jffs2_dbg(1, "%s(): dnode_version %d, highest version %d -> updating dnode\n",
103 __func__,
104 je32_to_cpu(ri->version), f->highest_version);
105 ri->version = cpu_to_je32(++f->highest_version);
106 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
107 }
108
109 ret = jffs2_flash_writev(c, vecs, cnt, flash_ofs, &retlen,
110 (alloc_mode==ALLOC_GC)?0:f->inocache->ino);
111
112 if (ret || (retlen != sizeof(*ri) + datalen)) {
113 pr_notice("Write of %zd bytes at 0x%08x failed. returned %d, retlen %zd\n",
114 sizeof(*ri) + datalen, flash_ofs, ret, retlen);
115
116 /* Mark the space as dirtied */
117 if (retlen) {
118 /* Don't change raw->size to match retlen. We may have
119 written the node header already, and only the data will
120 seem corrupted, in which case the scan would skip over
121 any node we write before the original intended end of
122 this node */
123 jffs2_add_physical_node_ref(c, flash_ofs | REF_OBSOLETE, PAD(sizeof(*ri)+datalen), NULL);
124 } else {
125 pr_notice("Not marking the space at 0x%08x as dirty because the flash driver returned retlen zero\n",
126 flash_ofs);
127 }
128 if (!retried && alloc_mode != ALLOC_NORETRY) {
129 /* Try to reallocate space and retry */
130 uint32_t dummy;
131 struct jffs2_eraseblock *jeb = &c->blocks[flash_ofs / c->sector_size];
132
133 retried = 1;
134
135 jffs2_dbg(1, "Retrying failed write.\n");
136
137 jffs2_dbg_acct_sanity_check(c,jeb);
138 jffs2_dbg_acct_paranoia_check(c, jeb);
139
140 if (alloc_mode == ALLOC_GC) {
141 ret = jffs2_reserve_space_gc(c, sizeof(*ri) + datalen, &dummy,
142 JFFS2_SUMMARY_INODE_SIZE);
143 } else {
144 /* Locking pain */
145 mutex_unlock(&f->sem);
146 jffs2_complete_reservation(c);
147
148 ret = jffs2_reserve_space(c, sizeof(*ri) + datalen, &dummy,
149 alloc_mode, JFFS2_SUMMARY_INODE_SIZE);
150 mutex_lock(&f->sem);
151 }
152
153 if (!ret) {
154 flash_ofs = write_ofs(c);
155 jffs2_dbg(1, "Allocated space at 0x%08x to retry failed write.\n",
156 flash_ofs);
157
158 jffs2_dbg_acct_sanity_check(c,jeb);
159 jffs2_dbg_acct_paranoia_check(c, jeb);
160
161 goto retry;
162 }
163 jffs2_dbg(1, "Failed to allocate space to retry failed write: %d!\n",
164 ret);
165 }
166 /* Release the full_dnode which is now useless, and return */
167 jffs2_free_full_dnode(fn);
168 return ERR_PTR(ret?ret:-EIO);
169 }
170 /* Mark the space used */
171 /* If node covers at least a whole page, or if it starts at the
172 beginning of a page and runs to the end of the file, or if
173 it's a hole node, mark it REF_PRISTINE, else REF_NORMAL.
174 */
175 if ((je32_to_cpu(ri->dsize) >= PAGE_SIZE) ||
176 ( ((je32_to_cpu(ri->offset)&(PAGE_SIZE-1))==0) &&
177 (je32_to_cpu(ri->dsize)+je32_to_cpu(ri->offset) == je32_to_cpu(ri->isize)))) {
178 flash_ofs |= REF_PRISTINE;
179 } else {
180 flash_ofs |= REF_NORMAL;
181 }
182 fn->raw = jffs2_add_physical_node_ref(c, flash_ofs, PAD(sizeof(*ri)+datalen), f->inocache);
183 if (IS_ERR(fn->raw)) {
184 void *hold_err = fn->raw;
185 /* Release the full_dnode which is now useless, and return */
186 jffs2_free_full_dnode(fn);
187 return ERR_CAST(hold_err);
188 }
189 fn->ofs = je32_to_cpu(ri->offset);
190 fn->size = je32_to_cpu(ri->dsize);
191 fn->frags = 0;
192
193 jffs2_dbg(1, "jffs2_write_dnode wrote node at 0x%08x(%d) with dsize 0x%x, csize 0x%x, node_crc 0x%08x, data_crc 0x%08x, totlen 0x%08x\n",
194 flash_ofs & ~3, flash_ofs & 3, je32_to_cpu(ri->dsize),
195 je32_to_cpu(ri->csize), je32_to_cpu(ri->node_crc),
196 je32_to_cpu(ri->data_crc), je32_to_cpu(ri->totlen));
197
198 if (retried) {
199 jffs2_dbg_acct_sanity_check(c,NULL);
200 }
201
202 return fn;
203 }
204
jffs2_write_dirent(struct jffs2_sb_info * c,struct jffs2_inode_info * f,struct jffs2_raw_dirent * rd,const unsigned char * name,uint32_t namelen,int alloc_mode)205 struct jffs2_full_dirent *jffs2_write_dirent(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
206 struct jffs2_raw_dirent *rd, const unsigned char *name,
207 uint32_t namelen, int alloc_mode)
208 {
209 struct jffs2_full_dirent *fd;
210 size_t retlen;
211 struct kvec vecs[2];
212 uint32_t flash_ofs;
213 int retried = 0;
214 int ret;
215
216 jffs2_dbg(1, "%s(ino #%u, name at *0x%p \"%s\"->ino #%u, name_crc 0x%08x)\n",
217 __func__,
218 je32_to_cpu(rd->pino), name, name, je32_to_cpu(rd->ino),
219 je32_to_cpu(rd->name_crc));
220
221 D1(if(je32_to_cpu(rd->hdr_crc) != crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)) {
222 pr_crit("Eep. CRC not correct in jffs2_write_dirent()\n");
223 BUG();
224 });
225
226 if (strnlen(name, namelen) != namelen) {
227 /* This should never happen, but seems to have done on at least one
228 occasion: https://dev.laptop.org/ticket/4184 */
229 pr_crit("Error in jffs2_write_dirent() -- name contains zero bytes!\n");
230 pr_crit("Directory inode #%u, name at *0x%p \"%s\"->ino #%u, name_crc 0x%08x\n",
231 je32_to_cpu(rd->pino), name, name, je32_to_cpu(rd->ino),
232 je32_to_cpu(rd->name_crc));
233 WARN_ON(1);
234 return ERR_PTR(-EIO);
235 }
236
237 vecs[0].iov_base = rd;
238 vecs[0].iov_len = sizeof(*rd);
239 vecs[1].iov_base = (unsigned char *)name;
240 vecs[1].iov_len = namelen;
241
242 fd = jffs2_alloc_full_dirent(namelen+1);
243 if (!fd)
244 return ERR_PTR(-ENOMEM);
245
246 fd->version = je32_to_cpu(rd->version);
247 fd->ino = je32_to_cpu(rd->ino);
248 fd->nhash = full_name_hash(NULL, name, namelen);
249 fd->type = rd->type;
250 memcpy(fd->name, name, namelen);
251 fd->name[namelen]=0;
252
253 retry:
254 flash_ofs = write_ofs(c);
255
256 jffs2_dbg_prewrite_paranoia_check(c, flash_ofs, vecs[0].iov_len + vecs[1].iov_len);
257
258 if ((alloc_mode!=ALLOC_GC) && (je32_to_cpu(rd->version) < f->highest_version)) {
259 BUG_ON(!retried);
260 jffs2_dbg(1, "%s(): dirent_version %d, highest version %d -> updating dirent\n",
261 __func__,
262 je32_to_cpu(rd->version), f->highest_version);
263 rd->version = cpu_to_je32(++f->highest_version);
264 fd->version = je32_to_cpu(rd->version);
265 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
266 }
267
268 ret = jffs2_flash_writev(c, vecs, 2, flash_ofs, &retlen,
269 (alloc_mode==ALLOC_GC)?0:je32_to_cpu(rd->pino));
270 if (ret || (retlen != sizeof(*rd) + namelen)) {
271 pr_notice("Write of %zd bytes at 0x%08x failed. returned %d, retlen %zd\n",
272 sizeof(*rd) + namelen, flash_ofs, ret, retlen);
273 /* Mark the space as dirtied */
274 if (retlen) {
275 jffs2_add_physical_node_ref(c, flash_ofs | REF_OBSOLETE, PAD(sizeof(*rd)+namelen), NULL);
276 } else {
277 pr_notice("Not marking the space at 0x%08x as dirty because the flash driver returned retlen zero\n",
278 flash_ofs);
279 }
280 if (!retried) {
281 /* Try to reallocate space and retry */
282 uint32_t dummy;
283 struct jffs2_eraseblock *jeb = &c->blocks[flash_ofs / c->sector_size];
284
285 retried = 1;
286
287 jffs2_dbg(1, "Retrying failed write.\n");
288
289 jffs2_dbg_acct_sanity_check(c,jeb);
290 jffs2_dbg_acct_paranoia_check(c, jeb);
291
292 if (alloc_mode == ALLOC_GC) {
293 ret = jffs2_reserve_space_gc(c, sizeof(*rd) + namelen, &dummy,
294 JFFS2_SUMMARY_DIRENT_SIZE(namelen));
295 } else {
296 /* Locking pain */
297 mutex_unlock(&f->sem);
298 jffs2_complete_reservation(c);
299
300 ret = jffs2_reserve_space(c, sizeof(*rd) + namelen, &dummy,
301 alloc_mode, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
302 mutex_lock(&f->sem);
303 }
304
305 if (!ret) {
306 flash_ofs = write_ofs(c);
307 jffs2_dbg(1, "Allocated space at 0x%08x to retry failed write\n",
308 flash_ofs);
309 jffs2_dbg_acct_sanity_check(c,jeb);
310 jffs2_dbg_acct_paranoia_check(c, jeb);
311 goto retry;
312 }
313 jffs2_dbg(1, "Failed to allocate space to retry failed write: %d!\n",
314 ret);
315 }
316 /* Release the full_dnode which is now useless, and return */
317 jffs2_free_full_dirent(fd);
318 return ERR_PTR(ret?ret:-EIO);
319 }
320 /* Mark the space used */
321 fd->raw = jffs2_add_physical_node_ref(c, flash_ofs | dirent_node_state(rd),
322 PAD(sizeof(*rd)+namelen), f->inocache);
323 if (IS_ERR(fd->raw)) {
324 void *hold_err = fd->raw;
325 /* Release the full_dirent which is now useless, and return */
326 jffs2_free_full_dirent(fd);
327 return ERR_CAST(hold_err);
328 }
329
330 if (retried) {
331 jffs2_dbg_acct_sanity_check(c,NULL);
332 }
333
334 return fd;
335 }
336
337 /* The OS-specific code fills in the metadata in the jffs2_raw_inode for us, so that
338 we don't have to go digging in struct inode or its equivalent. It should set:
339 mode, uid, gid, (starting)isize, atime, ctime, mtime */
jffs2_write_inode_range(struct jffs2_sb_info * c,struct jffs2_inode_info * f,struct jffs2_raw_inode * ri,unsigned char * buf,uint32_t offset,uint32_t writelen,uint32_t * retlen)340 int jffs2_write_inode_range(struct jffs2_sb_info *c, struct jffs2_inode_info *f,
341 struct jffs2_raw_inode *ri, unsigned char *buf,
342 uint32_t offset, uint32_t writelen, uint32_t *retlen)
343 {
344 int ret = 0;
345 uint32_t writtenlen = 0;
346
347 jffs2_dbg(1, "%s(): Ino #%u, ofs 0x%x, len 0x%x\n",
348 __func__, f->inocache->ino, offset, writelen);
349
350 while(writelen) {
351 struct jffs2_full_dnode *fn;
352 unsigned char *comprbuf = NULL;
353 uint16_t comprtype = JFFS2_COMPR_NONE;
354 uint32_t alloclen;
355 uint32_t datalen, cdatalen;
356 int retried = 0;
357
358 retry:
359 jffs2_dbg(2, "jffs2_commit_write() loop: 0x%x to write to 0x%x\n",
360 writelen, offset);
361
362 ret = jffs2_reserve_space(c, sizeof(*ri) + JFFS2_MIN_DATA_LEN,
363 &alloclen, ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
364 if (ret) {
365 jffs2_dbg(1, "jffs2_reserve_space returned %d\n", ret);
366 break;
367 }
368 mutex_lock(&f->sem);
369 datalen = min_t(uint32_t, writelen,
370 PAGE_SIZE - (offset & (PAGE_SIZE-1)));
371 cdatalen = min_t(uint32_t, alloclen - sizeof(*ri), datalen);
372
373 comprtype = jffs2_compress(c, f, buf, &comprbuf, &datalen, &cdatalen);
374
375 ri->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
376 ri->nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE);
377 ri->totlen = cpu_to_je32(sizeof(*ri) + cdatalen);
378 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
379
380 ri->ino = cpu_to_je32(f->inocache->ino);
381 ri->version = cpu_to_je32(++f->highest_version);
382 ri->isize = cpu_to_je32(max(je32_to_cpu(ri->isize), offset + datalen));
383 ri->offset = cpu_to_je32(offset);
384 ri->csize = cpu_to_je32(cdatalen);
385 ri->dsize = cpu_to_je32(datalen);
386 ri->compr = comprtype & 0xff;
387 ri->usercompr = (comprtype >> 8 ) & 0xff;
388 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
389 ri->data_crc = cpu_to_je32(crc32(0, comprbuf, cdatalen));
390
391 fn = jffs2_write_dnode(c, f, ri, comprbuf, cdatalen, ALLOC_NORETRY);
392
393 jffs2_free_comprbuf(comprbuf, buf);
394
395 if (IS_ERR(fn)) {
396 ret = PTR_ERR(fn);
397 mutex_unlock(&f->sem);
398 jffs2_complete_reservation(c);
399 if (!retried) {
400 /* Write error to be retried */
401 retried = 1;
402 jffs2_dbg(1, "Retrying node write in jffs2_write_inode_range()\n");
403 goto retry;
404 }
405 break;
406 }
407 ret = jffs2_add_full_dnode_to_inode(c, f, fn);
408 if (f->metadata) {
409 jffs2_mark_node_obsolete(c, f->metadata->raw);
410 jffs2_free_full_dnode(f->metadata);
411 f->metadata = NULL;
412 }
413 if (ret) {
414 /* Eep */
415 jffs2_dbg(1, "Eep. add_full_dnode_to_inode() failed in commit_write, returned %d\n",
416 ret);
417 jffs2_mark_node_obsolete(c, fn->raw);
418 jffs2_free_full_dnode(fn);
419
420 mutex_unlock(&f->sem);
421 jffs2_complete_reservation(c);
422 break;
423 }
424 mutex_unlock(&f->sem);
425 jffs2_complete_reservation(c);
426 if (!datalen) {
427 pr_warn("Eep. We didn't actually write any data in jffs2_write_inode_range()\n");
428 ret = -EIO;
429 break;
430 }
431 jffs2_dbg(1, "increasing writtenlen by %d\n", datalen);
432 writtenlen += datalen;
433 offset += datalen;
434 writelen -= datalen;
435 buf += datalen;
436 }
437 *retlen = writtenlen;
438 return ret;
439 }
440
jffs2_do_create(struct jffs2_sb_info * c,struct jffs2_inode_info * dir_f,struct jffs2_inode_info * f,struct jffs2_raw_inode * ri,const struct qstr * qstr)441 int jffs2_do_create(struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f,
442 struct jffs2_inode_info *f, struct jffs2_raw_inode *ri,
443 const struct qstr *qstr)
444 {
445 struct jffs2_raw_dirent *rd;
446 struct jffs2_full_dnode *fn;
447 struct jffs2_full_dirent *fd;
448 uint32_t alloclen;
449 int ret;
450
451 /* Try to reserve enough space for both node and dirent.
452 * Just the node will do for now, though
453 */
454 ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL,
455 JFFS2_SUMMARY_INODE_SIZE);
456 jffs2_dbg(1, "%s(): reserved 0x%x bytes\n", __func__, alloclen);
457 if (ret)
458 return ret;
459
460 mutex_lock(&f->sem);
461
462 ri->data_crc = cpu_to_je32(0);
463 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
464
465 fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL);
466
467 jffs2_dbg(1, "jffs2_do_create created file with mode 0x%x\n",
468 jemode_to_cpu(ri->mode));
469
470 if (IS_ERR(fn)) {
471 jffs2_dbg(1, "jffs2_write_dnode() failed\n");
472 /* Eeek. Wave bye bye */
473 mutex_unlock(&f->sem);
474 jffs2_complete_reservation(c);
475 return PTR_ERR(fn);
476 }
477 /* No data here. Only a metadata node, which will be
478 obsoleted by the first data write
479 */
480 f->metadata = fn;
481
482 mutex_unlock(&f->sem);
483 jffs2_complete_reservation(c);
484
485 ret = jffs2_init_security(&f->vfs_inode, &dir_f->vfs_inode, qstr);
486 if (ret)
487 return ret;
488 ret = jffs2_init_acl_post(&f->vfs_inode);
489 if (ret)
490 return ret;
491
492 ret = jffs2_reserve_space(c, sizeof(*rd)+qstr->len, &alloclen,
493 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(qstr->len));
494
495 if (ret) {
496 /* Eep. */
497 jffs2_dbg(1, "jffs2_reserve_space() for dirent failed\n");
498 return ret;
499 }
500
501 rd = jffs2_alloc_raw_dirent();
502 if (!rd) {
503 /* Argh. Now we treat it like a normal delete */
504 jffs2_complete_reservation(c);
505 return -ENOMEM;
506 }
507
508 mutex_lock(&dir_f->sem);
509
510 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
511 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
512 rd->totlen = cpu_to_je32(sizeof(*rd) + qstr->len);
513 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
514
515 rd->pino = cpu_to_je32(dir_f->inocache->ino);
516 rd->version = cpu_to_je32(++dir_f->highest_version);
517 rd->ino = ri->ino;
518 rd->mctime = ri->ctime;
519 rd->nsize = qstr->len;
520 rd->type = DT_REG;
521 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
522 rd->name_crc = cpu_to_je32(crc32(0, qstr->name, qstr->len));
523
524 fd = jffs2_write_dirent(c, dir_f, rd, qstr->name, qstr->len, ALLOC_NORMAL);
525
526 jffs2_free_raw_dirent(rd);
527
528 if (IS_ERR(fd)) {
529 /* dirent failed to write. Delete the inode normally
530 as if it were the final unlink() */
531 jffs2_complete_reservation(c);
532 mutex_unlock(&dir_f->sem);
533 return PTR_ERR(fd);
534 }
535
536 /* Link the fd into the inode's list, obsoleting an old
537 one if necessary. */
538 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
539
540 jffs2_complete_reservation(c);
541 mutex_unlock(&dir_f->sem);
542
543 return 0;
544 }
545
546
jffs2_do_unlink(struct jffs2_sb_info * c,struct jffs2_inode_info * dir_f,const char * name,int namelen,struct jffs2_inode_info * dead_f,uint32_t time)547 int jffs2_do_unlink(struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f,
548 const char *name, int namelen, struct jffs2_inode_info *dead_f,
549 uint32_t time)
550 {
551 struct jffs2_raw_dirent *rd;
552 struct jffs2_full_dirent *fd;
553 uint32_t alloclen;
554 int ret;
555
556 if (!jffs2_can_mark_obsolete(c)) {
557 /* We can't mark stuff obsolete on the medium. We need to write a deletion dirent */
558
559 rd = jffs2_alloc_raw_dirent();
560 if (!rd)
561 return -ENOMEM;
562
563 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
564 ALLOC_DELETION, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
565 if (ret) {
566 jffs2_free_raw_dirent(rd);
567 return ret;
568 }
569
570 mutex_lock(&dir_f->sem);
571
572 /* Build a deletion node */
573 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
574 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
575 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
576 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
577
578 rd->pino = cpu_to_je32(dir_f->inocache->ino);
579 rd->version = cpu_to_je32(++dir_f->highest_version);
580 rd->ino = cpu_to_je32(0);
581 rd->mctime = cpu_to_je32(time);
582 rd->nsize = namelen;
583 rd->type = DT_UNKNOWN;
584 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
585 rd->name_crc = cpu_to_je32(crc32(0, name, namelen));
586
587 fd = jffs2_write_dirent(c, dir_f, rd, name, namelen, ALLOC_DELETION);
588
589 jffs2_free_raw_dirent(rd);
590
591 if (IS_ERR(fd)) {
592 jffs2_complete_reservation(c);
593 mutex_unlock(&dir_f->sem);
594 return PTR_ERR(fd);
595 }
596
597 /* File it. This will mark the old one obsolete. */
598 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
599 mutex_unlock(&dir_f->sem);
600 } else {
601 uint32_t nhash = full_name_hash(NULL, name, namelen);
602
603 fd = dir_f->dents;
604 /* We don't actually want to reserve any space, but we do
605 want to be holding the alloc_sem when we write to flash */
606 mutex_lock(&c->alloc_sem);
607 mutex_lock(&dir_f->sem);
608
609 for (fd = dir_f->dents; fd; fd = fd->next) {
610 if (fd->nhash == nhash &&
611 !memcmp(fd->name, name, namelen) &&
612 !fd->name[namelen]) {
613
614 jffs2_dbg(1, "Marking old dirent node (ino #%u) @%08x obsolete\n",
615 fd->ino, ref_offset(fd->raw));
616 jffs2_mark_node_obsolete(c, fd->raw);
617 /* We don't want to remove it from the list immediately,
618 because that screws up getdents()/seek() semantics even
619 more than they're screwed already. Turn it into a
620 node-less deletion dirent instead -- a placeholder */
621 fd->raw = NULL;
622 fd->ino = 0;
623 break;
624 }
625 }
626 mutex_unlock(&dir_f->sem);
627 }
628
629 /* dead_f is NULL if this was a rename not a real unlink */
630 /* Also catch the !f->inocache case, where there was a dirent
631 pointing to an inode which didn't exist. */
632 if (dead_f && dead_f->inocache) {
633
634 mutex_lock(&dead_f->sem);
635
636 if (S_ISDIR(OFNI_EDONI_2SFFJ(dead_f)->i_mode)) {
637 while (dead_f->dents) {
638 /* There can be only deleted ones */
639 fd = dead_f->dents;
640
641 dead_f->dents = fd->next;
642
643 if (fd->ino) {
644 pr_warn("Deleting inode #%u with active dentry \"%s\"->ino #%u\n",
645 dead_f->inocache->ino,
646 fd->name, fd->ino);
647 } else {
648 jffs2_dbg(1, "Removing deletion dirent for \"%s\" from dir ino #%u\n",
649 fd->name,
650 dead_f->inocache->ino);
651 }
652 if (fd->raw)
653 jffs2_mark_node_obsolete(c, fd->raw);
654 jffs2_free_full_dirent(fd);
655 }
656 dead_f->inocache->pino_nlink = 0;
657 } else
658 dead_f->inocache->pino_nlink--;
659 /* NB: Caller must set inode nlink if appropriate */
660 mutex_unlock(&dead_f->sem);
661 }
662
663 jffs2_complete_reservation(c);
664
665 return 0;
666 }
667
668
jffs2_do_link(struct jffs2_sb_info * c,struct jffs2_inode_info * dir_f,uint32_t ino,uint8_t type,const char * name,int namelen,uint32_t time)669 int jffs2_do_link (struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f, uint32_t ino, uint8_t type, const char *name, int namelen, uint32_t time)
670 {
671 struct jffs2_raw_dirent *rd;
672 struct jffs2_full_dirent *fd;
673 uint32_t alloclen;
674 int ret;
675
676 rd = jffs2_alloc_raw_dirent();
677 if (!rd)
678 return -ENOMEM;
679
680 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
681 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
682 if (ret) {
683 jffs2_free_raw_dirent(rd);
684 return ret;
685 }
686
687 mutex_lock(&dir_f->sem);
688
689 /* Build a deletion node */
690 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
691 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
692 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
693 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
694
695 rd->pino = cpu_to_je32(dir_f->inocache->ino);
696 rd->version = cpu_to_je32(++dir_f->highest_version);
697 rd->ino = cpu_to_je32(ino);
698 rd->mctime = cpu_to_je32(time);
699 rd->nsize = namelen;
700
701 rd->type = type;
702
703 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
704 rd->name_crc = cpu_to_je32(crc32(0, name, namelen));
705
706 fd = jffs2_write_dirent(c, dir_f, rd, name, namelen, ALLOC_NORMAL);
707
708 jffs2_free_raw_dirent(rd);
709
710 if (IS_ERR(fd)) {
711 jffs2_complete_reservation(c);
712 mutex_unlock(&dir_f->sem);
713 return PTR_ERR(fd);
714 }
715
716 /* File it. This will mark the old one obsolete. */
717 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
718
719 jffs2_complete_reservation(c);
720 mutex_unlock(&dir_f->sem);
721
722 return 0;
723 }
724