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 | |
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, new: 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 | |
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(error: -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, count: cnt, to: flash_ofs, retlen: &retlen, |
110 | ino: (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, ofs: 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, minsize: sizeof(*ri) + datalen, len: &dummy, |
142 | JFFS2_SUMMARY_INODE_SIZE); |
143 | } else { |
144 | /* Locking pain */ |
145 | mutex_unlock(lock: &f->sem); |
146 | jffs2_complete_reservation(c); |
147 | |
148 | ret = jffs2_reserve_space(c, minsize: sizeof(*ri) + datalen, len: &dummy, |
149 | prio: 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(error: 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, ofs: flash_ofs, PAD(sizeof(*ri)+datalen), ic: f->inocache); |
183 | if (IS_ERR(ptr: 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(ptr: 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 | |
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(p: name, maxlen: 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(error: -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(namesize: namelen+1); |
243 | if (!fd) |
244 | return ERR_PTR(error: -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, count: 2, to: flash_ofs, retlen: &retlen, |
269 | ino: (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, ofs: 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, minsize: sizeof(*rd) + namelen, len: &dummy, |
294 | JFFS2_SUMMARY_DIRENT_SIZE(namelen)); |
295 | } else { |
296 | /* Locking pain */ |
297 | mutex_unlock(lock: &f->sem); |
298 | jffs2_complete_reservation(c); |
299 | |
300 | ret = jffs2_reserve_space(c, minsize: sizeof(*rd) + namelen, len: &dummy, |
301 | prio: 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(error: ret?ret:-EIO); |
319 | } |
320 | /* Mark the space used */ |
321 | fd->raw = jffs2_add_physical_node_ref(c, ofs: flash_ofs | dirent_node_state(rd), |
322 | PAD(sizeof(*rd)+namelen), ic: f->inocache); |
323 | if (IS_ERR(ptr: 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(ptr: 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 */ |
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, minsize: sizeof(*ri) + JFFS2_MIN_DATA_LEN, |
363 | len: &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, data_in: buf, cpage_out: &comprbuf, datalen: &datalen, cdatalen: &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, data: comprbuf, datalen: cdatalen, ALLOC_NORETRY); |
392 | |
393 | jffs2_free_comprbuf(comprbuf, orig: buf); |
394 | |
395 | if (IS_ERR(ptr: fn)) { |
396 | ret = PTR_ERR(ptr: fn); |
397 | mutex_unlock(lock: &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, raw: 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, raw: fn->raw); |
418 | jffs2_free_full_dnode(fn); |
419 | |
420 | mutex_unlock(lock: &f->sem); |
421 | jffs2_complete_reservation(c); |
422 | break; |
423 | } |
424 | mutex_unlock(lock: &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 | |
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, minsize: sizeof(*ri), len: &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 | |
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, minsize: sizeof(*rd)+namelen, len: &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 | |
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, minsize: sizeof(*rd)+namelen, len: &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, f: dir_f, rd, name, namelen, ALLOC_NORMAL); |
707 | |
708 | jffs2_free_raw_dirent(rd); |
709 | |
710 | if (IS_ERR(ptr: fd)) { |
711 | jffs2_complete_reservation(c); |
712 | mutex_unlock(lock: &dir_f->sem); |
713 | return PTR_ERR(ptr: fd); |
714 | } |
715 | |
716 | /* File it. This will mark the old one obsolete. */ |
717 | jffs2_add_fd_to_list(c, new: fd, list: &dir_f->dents); |
718 | |
719 | jffs2_complete_reservation(c); |
720 | mutex_unlock(lock: &dir_f->sem); |
721 | |
722 | return 0; |
723 | } |
724 | |