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1da177e4 LT |
1 | /* |
2 | * JFFS2 -- Journalling Flash File System, Version 2. | |
3 | * | |
4 | * Copyright (C) 2001-2003 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 | * $Id: write.c,v 1.87 2004/11/16 20:36:12 dwmw2 Exp $ | |
11 | * | |
12 | */ | |
13 | ||
14 | #include <linux/kernel.h> | |
15 | #include <linux/fs.h> | |
16 | #include <linux/crc32.h> | |
17 | #include <linux/slab.h> | |
18 | #include <linux/pagemap.h> | |
19 | #include <linux/mtd/mtd.h> | |
20 | #include "nodelist.h" | |
21 | #include "compr.h" | |
22 | ||
23 | ||
24 | int jffs2_do_new_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f, 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->nlink = 1; | |
37 | f->inocache->nodes = (struct jffs2_raw_node_ref *)f->inocache; | |
38 | f->inocache->ino = ++c->highest_ino; | |
39 | f->inocache->state = INO_STATE_PRESENT; | |
40 | ||
41 | ri->ino = cpu_to_je32(f->inocache->ino); | |
42 | ||
43 | D1(printk(KERN_DEBUG "jffs2_do_new_inode(): Assigned ino# %d\n", f->inocache->ino)); | |
44 | jffs2_add_ino_cache(c, f->inocache); | |
45 | ||
46 | ri->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
47 | ri->nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE); | |
48 | ri->totlen = cpu_to_je32(PAD(sizeof(*ri))); | |
49 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); | |
50 | ri->mode = cpu_to_jemode(mode); | |
51 | ||
52 | f->highest_version = 1; | |
53 | ri->version = cpu_to_je32(f->highest_version); | |
54 | ||
55 | return 0; | |
56 | } | |
57 | ||
58 | #if CONFIG_JFFS2_FS_DEBUG > 0 | |
59 | static void writecheck(struct jffs2_sb_info *c, uint32_t ofs) | |
60 | { | |
61 | unsigned char buf[16]; | |
62 | size_t retlen; | |
63 | int ret, i; | |
64 | ||
65 | ret = jffs2_flash_read(c, ofs, 16, &retlen, buf); | |
66 | if (ret || (retlen != 16)) { | |
67 | D1(printk(KERN_DEBUG "read failed or short in writecheck(). ret %d, retlen %zd\n", ret, retlen)); | |
68 | return; | |
69 | } | |
70 | ret = 0; | |
71 | for (i=0; i<16; i++) { | |
72 | if (buf[i] != 0xff) | |
73 | ret = 1; | |
74 | } | |
75 | if (ret) { | |
76 | printk(KERN_WARNING "ARGH. About to write node to 0x%08x on flash, but there are data already there:\n", ofs); | |
77 | printk(KERN_WARNING "0x%08x: %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x\n", | |
78 | ofs, | |
79 | buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6], buf[7], | |
80 | buf[8], buf[9], buf[10], buf[11], buf[12], buf[13], buf[14], buf[15]); | |
81 | } | |
82 | } | |
83 | #endif | |
84 | ||
85 | ||
86 | /* jffs2_write_dnode - given a raw_inode, allocate a full_dnode for it, | |
87 | write it to the flash, link it into the existing inode/fragment list */ | |
88 | ||
89 | struct jffs2_full_dnode *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, uint32_t flash_ofs, int alloc_mode) | |
90 | ||
91 | { | |
92 | struct jffs2_raw_node_ref *raw; | |
93 | struct jffs2_full_dnode *fn; | |
94 | size_t retlen; | |
95 | struct kvec vecs[2]; | |
96 | int ret; | |
97 | int retried = 0; | |
98 | unsigned long cnt = 2; | |
99 | ||
100 | D1(if(je32_to_cpu(ri->hdr_crc) != crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)) { | |
101 | printk(KERN_CRIT "Eep. CRC not correct in jffs2_write_dnode()\n"); | |
102 | BUG(); | |
103 | } | |
104 | ); | |
105 | vecs[0].iov_base = ri; | |
106 | vecs[0].iov_len = sizeof(*ri); | |
107 | vecs[1].iov_base = (unsigned char *)data; | |
108 | vecs[1].iov_len = datalen; | |
109 | ||
110 | D1(writecheck(c, flash_ofs)); | |
111 | ||
112 | if (je32_to_cpu(ri->totlen) != sizeof(*ri) + datalen) { | |
113 | printk(KERN_WARNING "jffs2_write_dnode: ri->totlen (0x%08x) != sizeof(*ri) (0x%08zx) + datalen (0x%08x)\n", je32_to_cpu(ri->totlen), sizeof(*ri), datalen); | |
114 | } | |
115 | raw = jffs2_alloc_raw_node_ref(); | |
116 | if (!raw) | |
117 | return ERR_PTR(-ENOMEM); | |
118 | ||
119 | fn = jffs2_alloc_full_dnode(); | |
120 | if (!fn) { | |
121 | jffs2_free_raw_node_ref(raw); | |
122 | return ERR_PTR(-ENOMEM); | |
123 | } | |
124 | ||
125 | fn->ofs = je32_to_cpu(ri->offset); | |
126 | fn->size = je32_to_cpu(ri->dsize); | |
127 | fn->frags = 0; | |
128 | ||
129 | /* check number of valid vecs */ | |
130 | if (!datalen || !data) | |
131 | cnt = 1; | |
132 | retry: | |
133 | fn->raw = raw; | |
134 | ||
135 | raw->flash_offset = flash_ofs; | |
136 | raw->__totlen = PAD(sizeof(*ri)+datalen); | |
137 | raw->next_phys = NULL; | |
138 | ||
139 | ret = jffs2_flash_writev(c, vecs, cnt, flash_ofs, &retlen, | |
140 | (alloc_mode==ALLOC_GC)?0:f->inocache->ino); | |
141 | ||
142 | if (ret || (retlen != sizeof(*ri) + datalen)) { | |
143 | printk(KERN_NOTICE "Write of %zd bytes at 0x%08x failed. returned %d, retlen %zd\n", | |
144 | sizeof(*ri)+datalen, flash_ofs, ret, retlen); | |
145 | ||
146 | /* Mark the space as dirtied */ | |
147 | if (retlen) { | |
148 | /* Doesn't belong to any inode */ | |
149 | raw->next_in_ino = NULL; | |
150 | ||
151 | /* Don't change raw->size to match retlen. We may have | |
152 | written the node header already, and only the data will | |
153 | seem corrupted, in which case the scan would skip over | |
154 | any node we write before the original intended end of | |
155 | this node */ | |
156 | raw->flash_offset |= REF_OBSOLETE; | |
157 | jffs2_add_physical_node_ref(c, raw); | |
158 | jffs2_mark_node_obsolete(c, raw); | |
159 | } else { | |
160 | printk(KERN_NOTICE "Not marking the space at 0x%08x as dirty because the flash driver returned retlen zero\n", raw->flash_offset); | |
161 | jffs2_free_raw_node_ref(raw); | |
162 | } | |
163 | if (!retried && alloc_mode != ALLOC_NORETRY && (raw = jffs2_alloc_raw_node_ref())) { | |
164 | /* Try to reallocate space and retry */ | |
165 | uint32_t dummy; | |
166 | struct jffs2_eraseblock *jeb = &c->blocks[flash_ofs / c->sector_size]; | |
167 | ||
168 | retried = 1; | |
169 | ||
170 | D1(printk(KERN_DEBUG "Retrying failed write.\n")); | |
171 | ||
172 | ACCT_SANITY_CHECK(c,jeb); | |
173 | D1(ACCT_PARANOIA_CHECK(jeb)); | |
174 | ||
175 | if (alloc_mode == ALLOC_GC) { | |
176 | ret = jffs2_reserve_space_gc(c, sizeof(*ri) + datalen, &flash_ofs, &dummy); | |
177 | } else { | |
178 | /* Locking pain */ | |
179 | up(&f->sem); | |
180 | jffs2_complete_reservation(c); | |
181 | ||
182 | ret = jffs2_reserve_space(c, sizeof(*ri) + datalen, &flash_ofs, &dummy, alloc_mode); | |
183 | down(&f->sem); | |
184 | } | |
185 | ||
186 | if (!ret) { | |
187 | D1(printk(KERN_DEBUG "Allocated space at 0x%08x to retry failed write.\n", flash_ofs)); | |
188 | ||
189 | ACCT_SANITY_CHECK(c,jeb); | |
190 | D1(ACCT_PARANOIA_CHECK(jeb)); | |
191 | ||
192 | goto retry; | |
193 | } | |
194 | D1(printk(KERN_DEBUG "Failed to allocate space to retry failed write: %d!\n", ret)); | |
195 | jffs2_free_raw_node_ref(raw); | |
196 | } | |
197 | /* Release the full_dnode which is now useless, and return */ | |
198 | jffs2_free_full_dnode(fn); | |
199 | return ERR_PTR(ret?ret:-EIO); | |
200 | } | |
201 | /* Mark the space used */ | |
202 | /* If node covers at least a whole page, or if it starts at the | |
203 | beginning of a page and runs to the end of the file, or if | |
204 | it's a hole node, mark it REF_PRISTINE, else REF_NORMAL. | |
205 | */ | |
206 | if ((je32_to_cpu(ri->dsize) >= PAGE_CACHE_SIZE) || | |
207 | ( ((je32_to_cpu(ri->offset)&(PAGE_CACHE_SIZE-1))==0) && | |
208 | (je32_to_cpu(ri->dsize)+je32_to_cpu(ri->offset) == je32_to_cpu(ri->isize)))) { | |
209 | raw->flash_offset |= REF_PRISTINE; | |
210 | } else { | |
211 | raw->flash_offset |= REF_NORMAL; | |
212 | } | |
213 | jffs2_add_physical_node_ref(c, raw); | |
214 | ||
215 | /* Link into per-inode list */ | |
216 | spin_lock(&c->erase_completion_lock); | |
217 | raw->next_in_ino = f->inocache->nodes; | |
218 | f->inocache->nodes = raw; | |
219 | spin_unlock(&c->erase_completion_lock); | |
220 | ||
221 | D1(printk(KERN_DEBUG "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", | |
222 | flash_ofs, ref_flags(raw), je32_to_cpu(ri->dsize), | |
223 | je32_to_cpu(ri->csize), je32_to_cpu(ri->node_crc), | |
224 | je32_to_cpu(ri->data_crc), je32_to_cpu(ri->totlen))); | |
225 | ||
226 | if (retried) { | |
227 | ACCT_SANITY_CHECK(c,NULL); | |
228 | } | |
229 | ||
230 | return fn; | |
231 | } | |
232 | ||
233 | struct jffs2_full_dirent *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, uint32_t flash_ofs, int alloc_mode) | |
234 | { | |
235 | struct jffs2_raw_node_ref *raw; | |
236 | struct jffs2_full_dirent *fd; | |
237 | size_t retlen; | |
238 | struct kvec vecs[2]; | |
239 | int retried = 0; | |
240 | int ret; | |
241 | ||
242 | D1(printk(KERN_DEBUG "jffs2_write_dirent(ino #%u, name at *0x%p \"%s\"->ino #%u, name_crc 0x%08x)\n", | |
243 | je32_to_cpu(rd->pino), name, name, je32_to_cpu(rd->ino), | |
244 | je32_to_cpu(rd->name_crc))); | |
245 | D1(writecheck(c, flash_ofs)); | |
246 | ||
247 | D1(if(je32_to_cpu(rd->hdr_crc) != crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)) { | |
248 | printk(KERN_CRIT "Eep. CRC not correct in jffs2_write_dirent()\n"); | |
249 | BUG(); | |
250 | } | |
251 | ); | |
252 | ||
253 | vecs[0].iov_base = rd; | |
254 | vecs[0].iov_len = sizeof(*rd); | |
255 | vecs[1].iov_base = (unsigned char *)name; | |
256 | vecs[1].iov_len = namelen; | |
257 | ||
258 | raw = jffs2_alloc_raw_node_ref(); | |
259 | ||
260 | if (!raw) | |
261 | return ERR_PTR(-ENOMEM); | |
262 | ||
263 | fd = jffs2_alloc_full_dirent(namelen+1); | |
264 | if (!fd) { | |
265 | jffs2_free_raw_node_ref(raw); | |
266 | return ERR_PTR(-ENOMEM); | |
267 | } | |
268 | ||
269 | fd->version = je32_to_cpu(rd->version); | |
270 | fd->ino = je32_to_cpu(rd->ino); | |
271 | fd->nhash = full_name_hash(name, strlen(name)); | |
272 | fd->type = rd->type; | |
273 | memcpy(fd->name, name, namelen); | |
274 | fd->name[namelen]=0; | |
275 | ||
276 | retry: | |
277 | fd->raw = raw; | |
278 | ||
279 | raw->flash_offset = flash_ofs; | |
280 | raw->__totlen = PAD(sizeof(*rd)+namelen); | |
281 | raw->next_phys = NULL; | |
282 | ||
283 | ret = jffs2_flash_writev(c, vecs, 2, flash_ofs, &retlen, | |
284 | (alloc_mode==ALLOC_GC)?0:je32_to_cpu(rd->pino)); | |
285 | if (ret || (retlen != sizeof(*rd) + namelen)) { | |
286 | printk(KERN_NOTICE "Write of %zd bytes at 0x%08x failed. returned %d, retlen %zd\n", | |
287 | sizeof(*rd)+namelen, flash_ofs, ret, retlen); | |
288 | /* Mark the space as dirtied */ | |
289 | if (retlen) { | |
290 | raw->next_in_ino = NULL; | |
291 | raw->flash_offset |= REF_OBSOLETE; | |
292 | jffs2_add_physical_node_ref(c, raw); | |
293 | jffs2_mark_node_obsolete(c, raw); | |
294 | } else { | |
295 | printk(KERN_NOTICE "Not marking the space at 0x%08x as dirty because the flash driver returned retlen zero\n", raw->flash_offset); | |
296 | jffs2_free_raw_node_ref(raw); | |
297 | } | |
298 | if (!retried && (raw = jffs2_alloc_raw_node_ref())) { | |
299 | /* Try to reallocate space and retry */ | |
300 | uint32_t dummy; | |
301 | struct jffs2_eraseblock *jeb = &c->blocks[flash_ofs / c->sector_size]; | |
302 | ||
303 | retried = 1; | |
304 | ||
305 | D1(printk(KERN_DEBUG "Retrying failed write.\n")); | |
306 | ||
307 | ACCT_SANITY_CHECK(c,jeb); | |
308 | D1(ACCT_PARANOIA_CHECK(jeb)); | |
309 | ||
310 | if (alloc_mode == ALLOC_GC) { | |
311 | ret = jffs2_reserve_space_gc(c, sizeof(*rd) + namelen, &flash_ofs, &dummy); | |
312 | } else { | |
313 | /* Locking pain */ | |
314 | up(&f->sem); | |
315 | jffs2_complete_reservation(c); | |
316 | ||
317 | ret = jffs2_reserve_space(c, sizeof(*rd) + namelen, &flash_ofs, &dummy, alloc_mode); | |
318 | down(&f->sem); | |
319 | } | |
320 | ||
321 | if (!ret) { | |
322 | D1(printk(KERN_DEBUG "Allocated space at 0x%08x to retry failed write.\n", flash_ofs)); | |
323 | ACCT_SANITY_CHECK(c,jeb); | |
324 | D1(ACCT_PARANOIA_CHECK(jeb)); | |
325 | goto retry; | |
326 | } | |
327 | D1(printk(KERN_DEBUG "Failed to allocate space to retry failed write: %d!\n", ret)); | |
328 | jffs2_free_raw_node_ref(raw); | |
329 | } | |
330 | /* Release the full_dnode which is now useless, and return */ | |
331 | jffs2_free_full_dirent(fd); | |
332 | return ERR_PTR(ret?ret:-EIO); | |
333 | } | |
334 | /* Mark the space used */ | |
335 | raw->flash_offset |= REF_PRISTINE; | |
336 | jffs2_add_physical_node_ref(c, raw); | |
337 | ||
338 | spin_lock(&c->erase_completion_lock); | |
339 | raw->next_in_ino = f->inocache->nodes; | |
340 | f->inocache->nodes = raw; | |
341 | spin_unlock(&c->erase_completion_lock); | |
342 | ||
343 | if (retried) { | |
344 | ACCT_SANITY_CHECK(c,NULL); | |
345 | } | |
346 | ||
347 | return fd; | |
348 | } | |
349 | ||
350 | /* The OS-specific code fills in the metadata in the jffs2_raw_inode for us, so that | |
351 | we don't have to go digging in struct inode or its equivalent. It should set: | |
352 | mode, uid, gid, (starting)isize, atime, ctime, mtime */ | |
353 | int jffs2_write_inode_range(struct jffs2_sb_info *c, struct jffs2_inode_info *f, | |
354 | struct jffs2_raw_inode *ri, unsigned char *buf, | |
355 | uint32_t offset, uint32_t writelen, uint32_t *retlen) | |
356 | { | |
357 | int ret = 0; | |
358 | uint32_t writtenlen = 0; | |
359 | ||
360 | D1(printk(KERN_DEBUG "jffs2_write_inode_range(): Ino #%u, ofs 0x%x, len 0x%x\n", | |
361 | f->inocache->ino, offset, writelen)); | |
362 | ||
363 | while(writelen) { | |
364 | struct jffs2_full_dnode *fn; | |
365 | unsigned char *comprbuf = NULL; | |
366 | uint16_t comprtype = JFFS2_COMPR_NONE; | |
367 | uint32_t phys_ofs, alloclen; | |
368 | uint32_t datalen, cdatalen; | |
369 | int retried = 0; | |
370 | ||
371 | retry: | |
372 | D2(printk(KERN_DEBUG "jffs2_commit_write() loop: 0x%x to write to 0x%x\n", writelen, offset)); | |
373 | ||
374 | ret = jffs2_reserve_space(c, sizeof(*ri) + JFFS2_MIN_DATA_LEN, &phys_ofs, &alloclen, ALLOC_NORMAL); | |
375 | if (ret) { | |
376 | D1(printk(KERN_DEBUG "jffs2_reserve_space returned %d\n", ret)); | |
377 | break; | |
378 | } | |
379 | down(&f->sem); | |
380 | datalen = min_t(uint32_t, writelen, PAGE_CACHE_SIZE - (offset & (PAGE_CACHE_SIZE-1))); | |
381 | cdatalen = min_t(uint32_t, alloclen - sizeof(*ri), datalen); | |
382 | ||
383 | comprtype = jffs2_compress(c, f, buf, &comprbuf, &datalen, &cdatalen); | |
384 | ||
385 | ri->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
386 | ri->nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE); | |
387 | ri->totlen = cpu_to_je32(sizeof(*ri) + cdatalen); | |
388 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); | |
389 | ||
390 | ri->ino = cpu_to_je32(f->inocache->ino); | |
391 | ri->version = cpu_to_je32(++f->highest_version); | |
392 | ri->isize = cpu_to_je32(max(je32_to_cpu(ri->isize), offset + datalen)); | |
393 | ri->offset = cpu_to_je32(offset); | |
394 | ri->csize = cpu_to_je32(cdatalen); | |
395 | ri->dsize = cpu_to_je32(datalen); | |
396 | ri->compr = comprtype & 0xff; | |
397 | ri->usercompr = (comprtype >> 8 ) & 0xff; | |
398 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); | |
399 | ri->data_crc = cpu_to_je32(crc32(0, comprbuf, cdatalen)); | |
400 | ||
401 | fn = jffs2_write_dnode(c, f, ri, comprbuf, cdatalen, phys_ofs, ALLOC_NORETRY); | |
402 | ||
403 | jffs2_free_comprbuf(comprbuf, buf); | |
404 | ||
405 | if (IS_ERR(fn)) { | |
406 | ret = PTR_ERR(fn); | |
407 | up(&f->sem); | |
408 | jffs2_complete_reservation(c); | |
409 | if (!retried) { | |
410 | /* Write error to be retried */ | |
411 | retried = 1; | |
412 | D1(printk(KERN_DEBUG "Retrying node write in jffs2_write_inode_range()\n")); | |
413 | goto retry; | |
414 | } | |
415 | break; | |
416 | } | |
417 | ret = jffs2_add_full_dnode_to_inode(c, f, fn); | |
418 | if (f->metadata) { | |
419 | jffs2_mark_node_obsolete(c, f->metadata->raw); | |
420 | jffs2_free_full_dnode(f->metadata); | |
421 | f->metadata = NULL; | |
422 | } | |
423 | if (ret) { | |
424 | /* Eep */ | |
425 | D1(printk(KERN_DEBUG "Eep. add_full_dnode_to_inode() failed in commit_write, returned %d\n", ret)); | |
426 | jffs2_mark_node_obsolete(c, fn->raw); | |
427 | jffs2_free_full_dnode(fn); | |
428 | ||
429 | up(&f->sem); | |
430 | jffs2_complete_reservation(c); | |
431 | break; | |
432 | } | |
433 | up(&f->sem); | |
434 | jffs2_complete_reservation(c); | |
435 | if (!datalen) { | |
436 | printk(KERN_WARNING "Eep. We didn't actually write any data in jffs2_write_inode_range()\n"); | |
437 | ret = -EIO; | |
438 | break; | |
439 | } | |
440 | D1(printk(KERN_DEBUG "increasing writtenlen by %d\n", datalen)); | |
441 | writtenlen += datalen; | |
442 | offset += datalen; | |
443 | writelen -= datalen; | |
444 | buf += datalen; | |
445 | } | |
446 | *retlen = writtenlen; | |
447 | return ret; | |
448 | } | |
449 | ||
450 | int 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 char *name, int namelen) | |
451 | { | |
452 | struct jffs2_raw_dirent *rd; | |
453 | struct jffs2_full_dnode *fn; | |
454 | struct jffs2_full_dirent *fd; | |
455 | uint32_t alloclen, phys_ofs; | |
456 | int ret; | |
457 | ||
458 | /* Try to reserve enough space for both node and dirent. | |
459 | * Just the node will do for now, though | |
460 | */ | |
461 | ret = jffs2_reserve_space(c, sizeof(*ri), &phys_ofs, &alloclen, ALLOC_NORMAL); | |
462 | D1(printk(KERN_DEBUG "jffs2_do_create(): reserved 0x%x bytes\n", alloclen)); | |
463 | if (ret) { | |
464 | up(&f->sem); | |
465 | return ret; | |
466 | } | |
467 | ||
468 | ri->data_crc = cpu_to_je32(0); | |
469 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); | |
470 | ||
471 | fn = jffs2_write_dnode(c, f, ri, NULL, 0, phys_ofs, ALLOC_NORMAL); | |
472 | ||
473 | D1(printk(KERN_DEBUG "jffs2_do_create created file with mode 0x%x\n", | |
474 | jemode_to_cpu(ri->mode))); | |
475 | ||
476 | if (IS_ERR(fn)) { | |
477 | D1(printk(KERN_DEBUG "jffs2_write_dnode() failed\n")); | |
478 | /* Eeek. Wave bye bye */ | |
479 | up(&f->sem); | |
480 | jffs2_complete_reservation(c); | |
481 | return PTR_ERR(fn); | |
482 | } | |
483 | /* No data here. Only a metadata node, which will be | |
484 | obsoleted by the first data write | |
485 | */ | |
486 | f->metadata = fn; | |
487 | ||
488 | up(&f->sem); | |
489 | jffs2_complete_reservation(c); | |
490 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL); | |
491 | ||
492 | if (ret) { | |
493 | /* Eep. */ | |
494 | D1(printk(KERN_DEBUG "jffs2_reserve_space() for dirent failed\n")); | |
495 | return ret; | |
496 | } | |
497 | ||
498 | rd = jffs2_alloc_raw_dirent(); | |
499 | if (!rd) { | |
500 | /* Argh. Now we treat it like a normal delete */ | |
501 | jffs2_complete_reservation(c); | |
502 | return -ENOMEM; | |
503 | } | |
504 | ||
505 | down(&dir_f->sem); | |
506 | ||
507 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
508 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
509 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
510 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
511 | ||
512 | rd->pino = cpu_to_je32(dir_f->inocache->ino); | |
513 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
514 | rd->ino = ri->ino; | |
515 | rd->mctime = ri->ctime; | |
516 | rd->nsize = namelen; | |
517 | rd->type = DT_REG; | |
518 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
519 | rd->name_crc = cpu_to_je32(crc32(0, name, namelen)); | |
520 | ||
521 | fd = jffs2_write_dirent(c, dir_f, rd, name, namelen, phys_ofs, ALLOC_NORMAL); | |
522 | ||
523 | jffs2_free_raw_dirent(rd); | |
524 | ||
525 | if (IS_ERR(fd)) { | |
526 | /* dirent failed to write. Delete the inode normally | |
527 | as if it were the final unlink() */ | |
528 | jffs2_complete_reservation(c); | |
529 | up(&dir_f->sem); | |
530 | return PTR_ERR(fd); | |
531 | } | |
532 | ||
533 | /* Link the fd into the inode's list, obsoleting an old | |
534 | one if necessary. */ | |
535 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
536 | ||
537 | jffs2_complete_reservation(c); | |
538 | up(&dir_f->sem); | |
539 | ||
540 | return 0; | |
541 | } | |
542 | ||
543 | ||
544 | int jffs2_do_unlink(struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f, | |
545 | const char *name, int namelen, struct jffs2_inode_info *dead_f) | |
546 | { | |
547 | struct jffs2_raw_dirent *rd; | |
548 | struct jffs2_full_dirent *fd; | |
549 | uint32_t alloclen, phys_ofs; | |
550 | int ret; | |
551 | ||
552 | if (1 /* alternative branch needs testing */ || | |
553 | !jffs2_can_mark_obsolete(c)) { | |
554 | /* We can't mark stuff obsolete on the medium. We need to write a deletion dirent */ | |
555 | ||
556 | rd = jffs2_alloc_raw_dirent(); | |
557 | if (!rd) | |
558 | return -ENOMEM; | |
559 | ||
560 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_DELETION); | |
561 | if (ret) { | |
562 | jffs2_free_raw_dirent(rd); | |
563 | return ret; | |
564 | } | |
565 | ||
566 | down(&dir_f->sem); | |
567 | ||
568 | /* Build a deletion node */ | |
569 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
570 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
571 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
572 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
573 | ||
574 | rd->pino = cpu_to_je32(dir_f->inocache->ino); | |
575 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
576 | rd->ino = cpu_to_je32(0); | |
577 | rd->mctime = cpu_to_je32(get_seconds()); | |
578 | rd->nsize = namelen; | |
579 | rd->type = DT_UNKNOWN; | |
580 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
581 | rd->name_crc = cpu_to_je32(crc32(0, name, namelen)); | |
582 | ||
583 | fd = jffs2_write_dirent(c, dir_f, rd, name, namelen, phys_ofs, ALLOC_DELETION); | |
584 | ||
585 | jffs2_free_raw_dirent(rd); | |
586 | ||
587 | if (IS_ERR(fd)) { | |
588 | jffs2_complete_reservation(c); | |
589 | up(&dir_f->sem); | |
590 | return PTR_ERR(fd); | |
591 | } | |
592 | ||
593 | /* File it. This will mark the old one obsolete. */ | |
594 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
595 | up(&dir_f->sem); | |
596 | } else { | |
597 | struct jffs2_full_dirent **prev = &dir_f->dents; | |
598 | uint32_t nhash = full_name_hash(name, namelen); | |
599 | ||
600 | down(&dir_f->sem); | |
601 | ||
602 | while ((*prev) && (*prev)->nhash <= nhash) { | |
603 | if ((*prev)->nhash == nhash && | |
604 | !memcmp((*prev)->name, name, namelen) && | |
605 | !(*prev)->name[namelen]) { | |
606 | struct jffs2_full_dirent *this = *prev; | |
607 | ||
608 | D1(printk(KERN_DEBUG "Marking old dirent node (ino #%u) @%08x obsolete\n", | |
609 | this->ino, ref_offset(this->raw))); | |
610 | ||
611 | *prev = this->next; | |
612 | jffs2_mark_node_obsolete(c, (this->raw)); | |
613 | jffs2_free_full_dirent(this); | |
614 | break; | |
615 | } | |
616 | prev = &((*prev)->next); | |
617 | } | |
618 | up(&dir_f->sem); | |
619 | } | |
620 | ||
621 | /* dead_f is NULL if this was a rename not a real unlink */ | |
622 | /* Also catch the !f->inocache case, where there was a dirent | |
623 | pointing to an inode which didn't exist. */ | |
624 | if (dead_f && dead_f->inocache) { | |
625 | ||
626 | down(&dead_f->sem); | |
627 | ||
628 | while (dead_f->dents) { | |
629 | /* There can be only deleted ones */ | |
630 | fd = dead_f->dents; | |
631 | ||
632 | dead_f->dents = fd->next; | |
633 | ||
634 | if (fd->ino) { | |
635 | printk(KERN_WARNING "Deleting inode #%u with active dentry \"%s\"->ino #%u\n", | |
636 | dead_f->inocache->ino, fd->name, fd->ino); | |
637 | } else { | |
638 | D1(printk(KERN_DEBUG "Removing deletion dirent for \"%s\" from dir ino #%u\n", fd->name, dead_f->inocache->ino)); | |
639 | } | |
640 | jffs2_mark_node_obsolete(c, fd->raw); | |
641 | jffs2_free_full_dirent(fd); | |
642 | } | |
643 | ||
644 | dead_f->inocache->nlink--; | |
645 | /* NB: Caller must set inode nlink if appropriate */ | |
646 | up(&dead_f->sem); | |
647 | } | |
648 | ||
649 | jffs2_complete_reservation(c); | |
650 | ||
651 | return 0; | |
652 | } | |
653 | ||
654 | ||
655 | 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) | |
656 | { | |
657 | struct jffs2_raw_dirent *rd; | |
658 | struct jffs2_full_dirent *fd; | |
659 | uint32_t alloclen, phys_ofs; | |
660 | int ret; | |
661 | ||
662 | rd = jffs2_alloc_raw_dirent(); | |
663 | if (!rd) | |
664 | return -ENOMEM; | |
665 | ||
666 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL); | |
667 | if (ret) { | |
668 | jffs2_free_raw_dirent(rd); | |
669 | return ret; | |
670 | } | |
671 | ||
672 | down(&dir_f->sem); | |
673 | ||
674 | /* Build a deletion node */ | |
675 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
676 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
677 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
678 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
679 | ||
680 | rd->pino = cpu_to_je32(dir_f->inocache->ino); | |
681 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
682 | rd->ino = cpu_to_je32(ino); | |
683 | rd->mctime = cpu_to_je32(get_seconds()); | |
684 | rd->nsize = namelen; | |
685 | ||
686 | rd->type = type; | |
687 | ||
688 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
689 | rd->name_crc = cpu_to_je32(crc32(0, name, namelen)); | |
690 | ||
691 | fd = jffs2_write_dirent(c, dir_f, rd, name, namelen, phys_ofs, ALLOC_NORMAL); | |
692 | ||
693 | jffs2_free_raw_dirent(rd); | |
694 | ||
695 | if (IS_ERR(fd)) { | |
696 | jffs2_complete_reservation(c); | |
697 | up(&dir_f->sem); | |
698 | return PTR_ERR(fd); | |
699 | } | |
700 | ||
701 | /* File it. This will mark the old one obsolete. */ | |
702 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
703 | ||
704 | jffs2_complete_reservation(c); | |
705 | up(&dir_f->sem); | |
706 | ||
707 | return 0; | |
708 | } |