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Commit | Line | Data |
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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 | * | |
e0c8e42f | 10 | * $Id: write.c,v 1.94 2005/07/20 15:50:51 dedekind Exp $ |
1da177e4 LT |
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; | |
1da177e4 LT |
38 | f->inocache->state = INO_STATE_PRESENT; |
39 | ||
1da177e4 | 40 | |
1da177e4 | 41 | jffs2_add_ino_cache(c, f->inocache); |
7d200960 DW |
42 | D1(printk(KERN_DEBUG "jffs2_do_new_inode(): Assigned ino# %d\n", f->inocache->ino)); |
43 | ri->ino = cpu_to_je32(f->inocache->ino); | |
1da177e4 LT |
44 | |
45 | ri->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
46 | ri->nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE); | |
47 | ri->totlen = cpu_to_je32(PAD(sizeof(*ri))); | |
48 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); | |
49 | ri->mode = cpu_to_jemode(mode); | |
50 | ||
51 | f->highest_version = 1; | |
52 | ri->version = cpu_to_je32(f->highest_version); | |
53 | ||
54 | return 0; | |
55 | } | |
56 | ||
1da177e4 LT |
57 | /* jffs2_write_dnode - given a raw_inode, allocate a full_dnode for it, |
58 | write it to the flash, link it into the existing inode/fragment list */ | |
59 | ||
60 | 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) | |
61 | ||
62 | { | |
63 | struct jffs2_raw_node_ref *raw; | |
64 | struct jffs2_full_dnode *fn; | |
65 | size_t retlen; | |
66 | struct kvec vecs[2]; | |
67 | int ret; | |
68 | int retried = 0; | |
69 | unsigned long cnt = 2; | |
70 | ||
71 | D1(if(je32_to_cpu(ri->hdr_crc) != crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)) { | |
72 | printk(KERN_CRIT "Eep. CRC not correct in jffs2_write_dnode()\n"); | |
73 | BUG(); | |
74 | } | |
75 | ); | |
76 | vecs[0].iov_base = ri; | |
77 | vecs[0].iov_len = sizeof(*ri); | |
78 | vecs[1].iov_base = (unsigned char *)data; | |
79 | vecs[1].iov_len = datalen; | |
80 | ||
730554d9 | 81 | jffs2_dbg_prewrite_paranoia_check(c, flash_ofs, vecs[0].iov_len + vecs[1].iov_len); |
1da177e4 LT |
82 | |
83 | if (je32_to_cpu(ri->totlen) != sizeof(*ri) + datalen) { | |
84 | 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); | |
85 | } | |
86 | raw = jffs2_alloc_raw_node_ref(); | |
87 | if (!raw) | |
88 | return ERR_PTR(-ENOMEM); | |
89 | ||
90 | fn = jffs2_alloc_full_dnode(); | |
91 | if (!fn) { | |
92 | jffs2_free_raw_node_ref(raw); | |
93 | return ERR_PTR(-ENOMEM); | |
94 | } | |
95 | ||
96 | fn->ofs = je32_to_cpu(ri->offset); | |
97 | fn->size = je32_to_cpu(ri->dsize); | |
98 | fn->frags = 0; | |
99 | ||
100 | /* check number of valid vecs */ | |
101 | if (!datalen || !data) | |
102 | cnt = 1; | |
103 | retry: | |
104 | fn->raw = raw; | |
105 | ||
106 | raw->flash_offset = flash_ofs; | |
107 | raw->__totlen = PAD(sizeof(*ri)+datalen); | |
108 | raw->next_phys = NULL; | |
109 | ||
9b88f473 EH |
110 | if ((alloc_mode!=ALLOC_GC) && (je32_to_cpu(ri->version) < f->highest_version)) { |
111 | BUG_ON(!retried); | |
112 | D1(printk(KERN_DEBUG "jffs2_write_dnode : dnode_version %d, " | |
113 | "highest version %d -> updating dnode\n", | |
114 | je32_to_cpu(ri->version), f->highest_version)); | |
115 | ri->version = cpu_to_je32(++f->highest_version); | |
116 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); | |
e4803c30 EH |
117 | } |
118 | ||
1da177e4 LT |
119 | ret = jffs2_flash_writev(c, vecs, cnt, flash_ofs, &retlen, |
120 | (alloc_mode==ALLOC_GC)?0:f->inocache->ino); | |
121 | ||
122 | if (ret || (retlen != sizeof(*ri) + datalen)) { | |
123 | printk(KERN_NOTICE "Write of %zd bytes at 0x%08x failed. returned %d, retlen %zd\n", | |
124 | sizeof(*ri)+datalen, flash_ofs, ret, retlen); | |
125 | ||
126 | /* Mark the space as dirtied */ | |
127 | if (retlen) { | |
128 | /* Doesn't belong to any inode */ | |
129 | raw->next_in_ino = NULL; | |
130 | ||
131 | /* Don't change raw->size to match retlen. We may have | |
132 | written the node header already, and only the data will | |
133 | seem corrupted, in which case the scan would skip over | |
134 | any node we write before the original intended end of | |
135 | this node */ | |
136 | raw->flash_offset |= REF_OBSOLETE; | |
137 | jffs2_add_physical_node_ref(c, raw); | |
138 | jffs2_mark_node_obsolete(c, raw); | |
139 | } else { | |
140 | printk(KERN_NOTICE "Not marking the space at 0x%08x as dirty because the flash driver returned retlen zero\n", raw->flash_offset); | |
141 | jffs2_free_raw_node_ref(raw); | |
142 | } | |
143 | if (!retried && alloc_mode != ALLOC_NORETRY && (raw = jffs2_alloc_raw_node_ref())) { | |
144 | /* Try to reallocate space and retry */ | |
145 | uint32_t dummy; | |
146 | struct jffs2_eraseblock *jeb = &c->blocks[flash_ofs / c->sector_size]; | |
147 | ||
148 | retried = 1; | |
149 | ||
150 | D1(printk(KERN_DEBUG "Retrying failed write.\n")); | |
151 | ||
730554d9 AB |
152 | jffs2_dbg_acct_sanity_check(c,jeb); |
153 | jffs2_dbg_acct_paranoia_check(c, jeb); | |
1da177e4 LT |
154 | |
155 | if (alloc_mode == ALLOC_GC) { | |
156 | ret = jffs2_reserve_space_gc(c, sizeof(*ri) + datalen, &flash_ofs, &dummy); | |
157 | } else { | |
158 | /* Locking pain */ | |
159 | up(&f->sem); | |
160 | jffs2_complete_reservation(c); | |
161 | ||
162 | ret = jffs2_reserve_space(c, sizeof(*ri) + datalen, &flash_ofs, &dummy, alloc_mode); | |
163 | down(&f->sem); | |
164 | } | |
165 | ||
166 | if (!ret) { | |
167 | D1(printk(KERN_DEBUG "Allocated space at 0x%08x to retry failed write.\n", flash_ofs)); | |
168 | ||
730554d9 AB |
169 | jffs2_dbg_acct_sanity_check(c,jeb); |
170 | jffs2_dbg_acct_paranoia_check(c, jeb); | |
1da177e4 LT |
171 | |
172 | goto retry; | |
173 | } | |
174 | D1(printk(KERN_DEBUG "Failed to allocate space to retry failed write: %d!\n", ret)); | |
175 | jffs2_free_raw_node_ref(raw); | |
176 | } | |
177 | /* Release the full_dnode which is now useless, and return */ | |
178 | jffs2_free_full_dnode(fn); | |
179 | return ERR_PTR(ret?ret:-EIO); | |
180 | } | |
181 | /* Mark the space used */ | |
182 | /* If node covers at least a whole page, or if it starts at the | |
183 | beginning of a page and runs to the end of the file, or if | |
184 | it's a hole node, mark it REF_PRISTINE, else REF_NORMAL. | |
185 | */ | |
186 | if ((je32_to_cpu(ri->dsize) >= PAGE_CACHE_SIZE) || | |
187 | ( ((je32_to_cpu(ri->offset)&(PAGE_CACHE_SIZE-1))==0) && | |
188 | (je32_to_cpu(ri->dsize)+je32_to_cpu(ri->offset) == je32_to_cpu(ri->isize)))) { | |
189 | raw->flash_offset |= REF_PRISTINE; | |
190 | } else { | |
191 | raw->flash_offset |= REF_NORMAL; | |
192 | } | |
193 | jffs2_add_physical_node_ref(c, raw); | |
194 | ||
195 | /* Link into per-inode list */ | |
196 | spin_lock(&c->erase_completion_lock); | |
197 | raw->next_in_ino = f->inocache->nodes; | |
198 | f->inocache->nodes = raw; | |
199 | spin_unlock(&c->erase_completion_lock); | |
200 | ||
201 | 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", | |
202 | flash_ofs, ref_flags(raw), je32_to_cpu(ri->dsize), | |
203 | je32_to_cpu(ri->csize), je32_to_cpu(ri->node_crc), | |
204 | je32_to_cpu(ri->data_crc), je32_to_cpu(ri->totlen))); | |
205 | ||
206 | if (retried) { | |
730554d9 | 207 | jffs2_dbg_acct_sanity_check(c,NULL); |
1da177e4 LT |
208 | } |
209 | ||
210 | return fn; | |
211 | } | |
212 | ||
213 | 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) | |
214 | { | |
215 | struct jffs2_raw_node_ref *raw; | |
216 | struct jffs2_full_dirent *fd; | |
217 | size_t retlen; | |
218 | struct kvec vecs[2]; | |
219 | int retried = 0; | |
220 | int ret; | |
221 | ||
222 | D1(printk(KERN_DEBUG "jffs2_write_dirent(ino #%u, name at *0x%p \"%s\"->ino #%u, name_crc 0x%08x)\n", | |
223 | je32_to_cpu(rd->pino), name, name, je32_to_cpu(rd->ino), | |
224 | je32_to_cpu(rd->name_crc))); | |
730554d9 | 225 | |
1da177e4 LT |
226 | D1(if(je32_to_cpu(rd->hdr_crc) != crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)) { |
227 | printk(KERN_CRIT "Eep. CRC not correct in jffs2_write_dirent()\n"); | |
228 | BUG(); | |
229 | } | |
230 | ); | |
231 | ||
232 | vecs[0].iov_base = rd; | |
233 | vecs[0].iov_len = sizeof(*rd); | |
234 | vecs[1].iov_base = (unsigned char *)name; | |
235 | vecs[1].iov_len = namelen; | |
236 | ||
e0c8e42f AB |
237 | jffs2_dbg_prewrite_paranoia_check(c, flash_ofs, vecs[0].iov_len + vecs[1].iov_len); |
238 | ||
1da177e4 LT |
239 | raw = jffs2_alloc_raw_node_ref(); |
240 | ||
241 | if (!raw) | |
242 | return ERR_PTR(-ENOMEM); | |
243 | ||
244 | fd = jffs2_alloc_full_dirent(namelen+1); | |
245 | if (!fd) { | |
246 | jffs2_free_raw_node_ref(raw); | |
247 | return ERR_PTR(-ENOMEM); | |
248 | } | |
249 | ||
250 | fd->version = je32_to_cpu(rd->version); | |
251 | fd->ino = je32_to_cpu(rd->ino); | |
252 | fd->nhash = full_name_hash(name, strlen(name)); | |
253 | fd->type = rd->type; | |
254 | memcpy(fd->name, name, namelen); | |
255 | fd->name[namelen]=0; | |
256 | ||
257 | retry: | |
258 | fd->raw = raw; | |
259 | ||
260 | raw->flash_offset = flash_ofs; | |
261 | raw->__totlen = PAD(sizeof(*rd)+namelen); | |
262 | raw->next_phys = NULL; | |
263 | ||
9b88f473 EH |
264 | if ((alloc_mode!=ALLOC_GC) && (je32_to_cpu(rd->version) < f->highest_version)) { |
265 | BUG_ON(!retried); | |
266 | D1(printk(KERN_DEBUG "jffs2_write_dirent : dirent_version %d, " | |
267 | "highest version %d -> updating dirent\n", | |
268 | je32_to_cpu(rd->version), f->highest_version)); | |
269 | rd->version = cpu_to_je32(++f->highest_version); | |
270 | fd->version = je32_to_cpu(rd->version); | |
271 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
e4803c30 EH |
272 | } |
273 | ||
1da177e4 LT |
274 | ret = jffs2_flash_writev(c, vecs, 2, flash_ofs, &retlen, |
275 | (alloc_mode==ALLOC_GC)?0:je32_to_cpu(rd->pino)); | |
276 | if (ret || (retlen != sizeof(*rd) + namelen)) { | |
277 | printk(KERN_NOTICE "Write of %zd bytes at 0x%08x failed. returned %d, retlen %zd\n", | |
278 | sizeof(*rd)+namelen, flash_ofs, ret, retlen); | |
279 | /* Mark the space as dirtied */ | |
280 | if (retlen) { | |
281 | raw->next_in_ino = NULL; | |
282 | raw->flash_offset |= REF_OBSOLETE; | |
283 | jffs2_add_physical_node_ref(c, raw); | |
284 | jffs2_mark_node_obsolete(c, raw); | |
285 | } else { | |
286 | printk(KERN_NOTICE "Not marking the space at 0x%08x as dirty because the flash driver returned retlen zero\n", raw->flash_offset); | |
287 | jffs2_free_raw_node_ref(raw); | |
288 | } | |
289 | if (!retried && (raw = jffs2_alloc_raw_node_ref())) { | |
290 | /* Try to reallocate space and retry */ | |
291 | uint32_t dummy; | |
292 | struct jffs2_eraseblock *jeb = &c->blocks[flash_ofs / c->sector_size]; | |
293 | ||
294 | retried = 1; | |
295 | ||
296 | D1(printk(KERN_DEBUG "Retrying failed write.\n")); | |
297 | ||
730554d9 AB |
298 | jffs2_dbg_acct_sanity_check(c,jeb); |
299 | jffs2_dbg_acct_paranoia_check(c, jeb); | |
1da177e4 LT |
300 | |
301 | if (alloc_mode == ALLOC_GC) { | |
302 | ret = jffs2_reserve_space_gc(c, sizeof(*rd) + namelen, &flash_ofs, &dummy); | |
303 | } else { | |
304 | /* Locking pain */ | |
305 | up(&f->sem); | |
306 | jffs2_complete_reservation(c); | |
307 | ||
308 | ret = jffs2_reserve_space(c, sizeof(*rd) + namelen, &flash_ofs, &dummy, alloc_mode); | |
309 | down(&f->sem); | |
310 | } | |
311 | ||
312 | if (!ret) { | |
313 | D1(printk(KERN_DEBUG "Allocated space at 0x%08x to retry failed write.\n", flash_ofs)); | |
730554d9 AB |
314 | jffs2_dbg_acct_sanity_check(c,jeb); |
315 | jffs2_dbg_acct_paranoia_check(c, jeb); | |
1da177e4 LT |
316 | goto retry; |
317 | } | |
318 | D1(printk(KERN_DEBUG "Failed to allocate space to retry failed write: %d!\n", ret)); | |
319 | jffs2_free_raw_node_ref(raw); | |
320 | } | |
321 | /* Release the full_dnode which is now useless, and return */ | |
322 | jffs2_free_full_dirent(fd); | |
323 | return ERR_PTR(ret?ret:-EIO); | |
324 | } | |
325 | /* Mark the space used */ | |
326 | raw->flash_offset |= REF_PRISTINE; | |
327 | jffs2_add_physical_node_ref(c, raw); | |
328 | ||
329 | spin_lock(&c->erase_completion_lock); | |
330 | raw->next_in_ino = f->inocache->nodes; | |
331 | f->inocache->nodes = raw; | |
332 | spin_unlock(&c->erase_completion_lock); | |
333 | ||
334 | if (retried) { | |
730554d9 | 335 | jffs2_dbg_acct_sanity_check(c,NULL); |
1da177e4 LT |
336 | } |
337 | ||
338 | return fd; | |
339 | } | |
340 | ||
341 | /* The OS-specific code fills in the metadata in the jffs2_raw_inode for us, so that | |
342 | we don't have to go digging in struct inode or its equivalent. It should set: | |
343 | mode, uid, gid, (starting)isize, atime, ctime, mtime */ | |
344 | int jffs2_write_inode_range(struct jffs2_sb_info *c, struct jffs2_inode_info *f, | |
345 | struct jffs2_raw_inode *ri, unsigned char *buf, | |
346 | uint32_t offset, uint32_t writelen, uint32_t *retlen) | |
347 | { | |
348 | int ret = 0; | |
349 | uint32_t writtenlen = 0; | |
350 | ||
351 | D1(printk(KERN_DEBUG "jffs2_write_inode_range(): Ino #%u, ofs 0x%x, len 0x%x\n", | |
352 | f->inocache->ino, offset, writelen)); | |
353 | ||
354 | while(writelen) { | |
355 | struct jffs2_full_dnode *fn; | |
356 | unsigned char *comprbuf = NULL; | |
357 | uint16_t comprtype = JFFS2_COMPR_NONE; | |
358 | uint32_t phys_ofs, alloclen; | |
359 | uint32_t datalen, cdatalen; | |
360 | int retried = 0; | |
361 | ||
362 | retry: | |
363 | D2(printk(KERN_DEBUG "jffs2_commit_write() loop: 0x%x to write to 0x%x\n", writelen, offset)); | |
364 | ||
365 | ret = jffs2_reserve_space(c, sizeof(*ri) + JFFS2_MIN_DATA_LEN, &phys_ofs, &alloclen, ALLOC_NORMAL); | |
366 | if (ret) { | |
367 | D1(printk(KERN_DEBUG "jffs2_reserve_space returned %d\n", ret)); | |
368 | break; | |
369 | } | |
370 | down(&f->sem); | |
371 | datalen = min_t(uint32_t, writelen, PAGE_CACHE_SIZE - (offset & (PAGE_CACHE_SIZE-1))); | |
372 | cdatalen = min_t(uint32_t, alloclen - sizeof(*ri), datalen); | |
373 | ||
374 | comprtype = jffs2_compress(c, f, buf, &comprbuf, &datalen, &cdatalen); | |
375 | ||
376 | ri->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
377 | ri->nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE); | |
378 | ri->totlen = cpu_to_je32(sizeof(*ri) + cdatalen); | |
379 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); | |
380 | ||
381 | ri->ino = cpu_to_je32(f->inocache->ino); | |
382 | ri->version = cpu_to_je32(++f->highest_version); | |
383 | ri->isize = cpu_to_je32(max(je32_to_cpu(ri->isize), offset + datalen)); | |
384 | ri->offset = cpu_to_je32(offset); | |
385 | ri->csize = cpu_to_je32(cdatalen); | |
386 | ri->dsize = cpu_to_je32(datalen); | |
387 | ri->compr = comprtype & 0xff; | |
388 | ri->usercompr = (comprtype >> 8 ) & 0xff; | |
389 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); | |
390 | ri->data_crc = cpu_to_je32(crc32(0, comprbuf, cdatalen)); | |
391 | ||
392 | fn = jffs2_write_dnode(c, f, ri, comprbuf, cdatalen, phys_ofs, ALLOC_NORETRY); | |
393 | ||
394 | jffs2_free_comprbuf(comprbuf, buf); | |
395 | ||
396 | if (IS_ERR(fn)) { | |
397 | ret = PTR_ERR(fn); | |
398 | up(&f->sem); | |
399 | jffs2_complete_reservation(c); | |
400 | if (!retried) { | |
401 | /* Write error to be retried */ | |
402 | retried = 1; | |
403 | D1(printk(KERN_DEBUG "Retrying node write in jffs2_write_inode_range()\n")); | |
404 | goto retry; | |
405 | } | |
406 | break; | |
407 | } | |
408 | ret = jffs2_add_full_dnode_to_inode(c, f, fn); | |
409 | if (f->metadata) { | |
410 | jffs2_mark_node_obsolete(c, f->metadata->raw); | |
411 | jffs2_free_full_dnode(f->metadata); | |
412 | f->metadata = NULL; | |
413 | } | |
414 | if (ret) { | |
415 | /* Eep */ | |
416 | D1(printk(KERN_DEBUG "Eep. add_full_dnode_to_inode() failed in commit_write, returned %d\n", ret)); | |
417 | jffs2_mark_node_obsolete(c, fn->raw); | |
418 | jffs2_free_full_dnode(fn); | |
419 | ||
420 | up(&f->sem); | |
421 | jffs2_complete_reservation(c); | |
422 | break; | |
423 | } | |
424 | up(&f->sem); | |
425 | jffs2_complete_reservation(c); | |
426 | if (!datalen) { | |
427 | printk(KERN_WARNING "Eep. We didn't actually write any data in jffs2_write_inode_range()\n"); | |
428 | ret = -EIO; | |
429 | break; | |
430 | } | |
431 | D1(printk(KERN_DEBUG "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, struct jffs2_inode_info *f, struct jffs2_raw_inode *ri, const char *name, int namelen) | |
442 | { | |
443 | struct jffs2_raw_dirent *rd; | |
444 | struct jffs2_full_dnode *fn; | |
445 | struct jffs2_full_dirent *fd; | |
446 | uint32_t alloclen, phys_ofs; | |
447 | int ret; | |
448 | ||
449 | /* Try to reserve enough space for both node and dirent. | |
450 | * Just the node will do for now, though | |
451 | */ | |
452 | ret = jffs2_reserve_space(c, sizeof(*ri), &phys_ofs, &alloclen, ALLOC_NORMAL); | |
453 | D1(printk(KERN_DEBUG "jffs2_do_create(): reserved 0x%x bytes\n", alloclen)); | |
454 | if (ret) { | |
455 | up(&f->sem); | |
456 | return ret; | |
457 | } | |
458 | ||
459 | ri->data_crc = cpu_to_je32(0); | |
460 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); | |
461 | ||
462 | fn = jffs2_write_dnode(c, f, ri, NULL, 0, phys_ofs, ALLOC_NORMAL); | |
463 | ||
464 | D1(printk(KERN_DEBUG "jffs2_do_create created file with mode 0x%x\n", | |
465 | jemode_to_cpu(ri->mode))); | |
466 | ||
467 | if (IS_ERR(fn)) { | |
468 | D1(printk(KERN_DEBUG "jffs2_write_dnode() failed\n")); | |
469 | /* Eeek. Wave bye bye */ | |
470 | up(&f->sem); | |
471 | jffs2_complete_reservation(c); | |
472 | return PTR_ERR(fn); | |
473 | } | |
474 | /* No data here. Only a metadata node, which will be | |
475 | obsoleted by the first data write | |
476 | */ | |
477 | f->metadata = fn; | |
478 | ||
479 | up(&f->sem); | |
480 | jffs2_complete_reservation(c); | |
481 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL); | |
482 | ||
483 | if (ret) { | |
484 | /* Eep. */ | |
485 | D1(printk(KERN_DEBUG "jffs2_reserve_space() for dirent failed\n")); | |
486 | return ret; | |
487 | } | |
488 | ||
489 | rd = jffs2_alloc_raw_dirent(); | |
490 | if (!rd) { | |
491 | /* Argh. Now we treat it like a normal delete */ | |
492 | jffs2_complete_reservation(c); | |
493 | return -ENOMEM; | |
494 | } | |
495 | ||
496 | down(&dir_f->sem); | |
497 | ||
498 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
499 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
500 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
501 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
502 | ||
503 | rd->pino = cpu_to_je32(dir_f->inocache->ino); | |
504 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
505 | rd->ino = ri->ino; | |
506 | rd->mctime = ri->ctime; | |
507 | rd->nsize = namelen; | |
508 | rd->type = DT_REG; | |
509 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
510 | rd->name_crc = cpu_to_je32(crc32(0, name, namelen)); | |
511 | ||
512 | fd = jffs2_write_dirent(c, dir_f, rd, name, namelen, phys_ofs, ALLOC_NORMAL); | |
513 | ||
514 | jffs2_free_raw_dirent(rd); | |
515 | ||
516 | if (IS_ERR(fd)) { | |
517 | /* dirent failed to write. Delete the inode normally | |
518 | as if it were the final unlink() */ | |
519 | jffs2_complete_reservation(c); | |
520 | up(&dir_f->sem); | |
521 | return PTR_ERR(fd); | |
522 | } | |
523 | ||
524 | /* Link the fd into the inode's list, obsoleting an old | |
525 | one if necessary. */ | |
526 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
527 | ||
528 | jffs2_complete_reservation(c); | |
529 | up(&dir_f->sem); | |
530 | ||
531 | return 0; | |
532 | } | |
533 | ||
534 | ||
535 | int jffs2_do_unlink(struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f, | |
536 | const char *name, int namelen, struct jffs2_inode_info *dead_f) | |
537 | { | |
538 | struct jffs2_raw_dirent *rd; | |
539 | struct jffs2_full_dirent *fd; | |
540 | uint32_t alloclen, phys_ofs; | |
541 | int ret; | |
542 | ||
543 | if (1 /* alternative branch needs testing */ || | |
544 | !jffs2_can_mark_obsolete(c)) { | |
545 | /* We can't mark stuff obsolete on the medium. We need to write a deletion dirent */ | |
546 | ||
547 | rd = jffs2_alloc_raw_dirent(); | |
548 | if (!rd) | |
549 | return -ENOMEM; | |
550 | ||
551 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_DELETION); | |
552 | if (ret) { | |
553 | jffs2_free_raw_dirent(rd); | |
554 | return ret; | |
555 | } | |
556 | ||
557 | down(&dir_f->sem); | |
558 | ||
559 | /* Build a deletion node */ | |
560 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
561 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
562 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
563 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
564 | ||
565 | rd->pino = cpu_to_je32(dir_f->inocache->ino); | |
566 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
567 | rd->ino = cpu_to_je32(0); | |
568 | rd->mctime = cpu_to_je32(get_seconds()); | |
569 | rd->nsize = namelen; | |
570 | rd->type = DT_UNKNOWN; | |
571 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
572 | rd->name_crc = cpu_to_je32(crc32(0, name, namelen)); | |
573 | ||
574 | fd = jffs2_write_dirent(c, dir_f, rd, name, namelen, phys_ofs, ALLOC_DELETION); | |
575 | ||
576 | jffs2_free_raw_dirent(rd); | |
577 | ||
578 | if (IS_ERR(fd)) { | |
579 | jffs2_complete_reservation(c); | |
580 | up(&dir_f->sem); | |
581 | return PTR_ERR(fd); | |
582 | } | |
583 | ||
584 | /* File it. This will mark the old one obsolete. */ | |
585 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
586 | up(&dir_f->sem); | |
587 | } else { | |
588 | struct jffs2_full_dirent **prev = &dir_f->dents; | |
589 | uint32_t nhash = full_name_hash(name, namelen); | |
590 | ||
591 | down(&dir_f->sem); | |
592 | ||
593 | while ((*prev) && (*prev)->nhash <= nhash) { | |
594 | if ((*prev)->nhash == nhash && | |
595 | !memcmp((*prev)->name, name, namelen) && | |
596 | !(*prev)->name[namelen]) { | |
597 | struct jffs2_full_dirent *this = *prev; | |
598 | ||
599 | D1(printk(KERN_DEBUG "Marking old dirent node (ino #%u) @%08x obsolete\n", | |
600 | this->ino, ref_offset(this->raw))); | |
601 | ||
602 | *prev = this->next; | |
603 | jffs2_mark_node_obsolete(c, (this->raw)); | |
604 | jffs2_free_full_dirent(this); | |
605 | break; | |
606 | } | |
607 | prev = &((*prev)->next); | |
608 | } | |
609 | up(&dir_f->sem); | |
610 | } | |
611 | ||
612 | /* dead_f is NULL if this was a rename not a real unlink */ | |
613 | /* Also catch the !f->inocache case, where there was a dirent | |
614 | pointing to an inode which didn't exist. */ | |
615 | if (dead_f && dead_f->inocache) { | |
616 | ||
617 | down(&dead_f->sem); | |
618 | ||
32f1a95d AB |
619 | if (S_ISDIR(OFNI_EDONI_2SFFJ(dead_f)->i_mode)) { |
620 | while (dead_f->dents) { | |
621 | /* There can be only deleted ones */ | |
622 | fd = dead_f->dents; | |
623 | ||
624 | dead_f->dents = fd->next; | |
625 | ||
626 | if (fd->ino) { | |
627 | printk(KERN_WARNING "Deleting inode #%u with active dentry \"%s\"->ino #%u\n", | |
628 | dead_f->inocache->ino, fd->name, fd->ino); | |
629 | } else { | |
630 | D1(printk(KERN_DEBUG "Removing deletion dirent for \"%s\" from dir ino #%u\n", | |
631 | fd->name, dead_f->inocache->ino)); | |
632 | } | |
633 | jffs2_mark_node_obsolete(c, fd->raw); | |
634 | jffs2_free_full_dirent(fd); | |
1da177e4 | 635 | } |
1da177e4 LT |
636 | } |
637 | ||
638 | dead_f->inocache->nlink--; | |
639 | /* NB: Caller must set inode nlink if appropriate */ | |
640 | up(&dead_f->sem); | |
641 | } | |
642 | ||
643 | jffs2_complete_reservation(c); | |
644 | ||
645 | return 0; | |
646 | } | |
647 | ||
648 | ||
649 | 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) | |
650 | { | |
651 | struct jffs2_raw_dirent *rd; | |
652 | struct jffs2_full_dirent *fd; | |
653 | uint32_t alloclen, phys_ofs; | |
654 | int ret; | |
655 | ||
656 | rd = jffs2_alloc_raw_dirent(); | |
657 | if (!rd) | |
658 | return -ENOMEM; | |
659 | ||
660 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL); | |
661 | if (ret) { | |
662 | jffs2_free_raw_dirent(rd); | |
663 | return ret; | |
664 | } | |
665 | ||
666 | down(&dir_f->sem); | |
667 | ||
668 | /* Build a deletion node */ | |
669 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
670 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
671 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
672 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
673 | ||
674 | rd->pino = cpu_to_je32(dir_f->inocache->ino); | |
675 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
676 | rd->ino = cpu_to_je32(ino); | |
677 | rd->mctime = cpu_to_je32(get_seconds()); | |
678 | rd->nsize = namelen; | |
679 | ||
680 | rd->type = type; | |
681 | ||
682 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
683 | rd->name_crc = cpu_to_je32(crc32(0, name, namelen)); | |
684 | ||
685 | fd = jffs2_write_dirent(c, dir_f, rd, name, namelen, phys_ofs, ALLOC_NORMAL); | |
686 | ||
687 | jffs2_free_raw_dirent(rd); | |
688 | ||
689 | if (IS_ERR(fd)) { | |
690 | jffs2_complete_reservation(c); | |
691 | up(&dir_f->sem); | |
692 | return PTR_ERR(fd); | |
693 | } | |
694 | ||
695 | /* File it. This will mark the old one obsolete. */ | |
696 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
697 | ||
698 | jffs2_complete_reservation(c); | |
699 | up(&dir_f->sem); | |
700 | ||
701 | return 0; | |
702 | } |