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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 | * | |
7d200960 | 10 | * $Id: write.c,v 1.92 2005/04/13 13:22:35 dwmw2 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 | ||
57 | #if CONFIG_JFFS2_FS_DEBUG > 0 | |
58 | static void writecheck(struct jffs2_sb_info *c, uint32_t ofs) | |
59 | { | |
60 | unsigned char buf[16]; | |
61 | size_t retlen; | |
62 | int ret, i; | |
63 | ||
64 | ret = jffs2_flash_read(c, ofs, 16, &retlen, buf); | |
65 | if (ret || (retlen != 16)) { | |
66 | D1(printk(KERN_DEBUG "read failed or short in writecheck(). ret %d, retlen %zd\n", ret, retlen)); | |
67 | return; | |
68 | } | |
69 | ret = 0; | |
70 | for (i=0; i<16; i++) { | |
71 | if (buf[i] != 0xff) | |
72 | ret = 1; | |
73 | } | |
74 | if (ret) { | |
75 | printk(KERN_WARNING "ARGH. About to write node to 0x%08x on flash, but there are data already there:\n", ofs); | |
76 | printk(KERN_WARNING "0x%08x: %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x %02x\n", | |
77 | ofs, | |
78 | buf[0], buf[1], buf[2], buf[3], buf[4], buf[5], buf[6], buf[7], | |
79 | buf[8], buf[9], buf[10], buf[11], buf[12], buf[13], buf[14], buf[15]); | |
80 | } | |
81 | } | |
82 | #endif | |
83 | ||
84 | ||
85 | /* jffs2_write_dnode - given a raw_inode, allocate a full_dnode for it, | |
86 | write it to the flash, link it into the existing inode/fragment list */ | |
87 | ||
88 | 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) | |
89 | ||
90 | { | |
91 | struct jffs2_raw_node_ref *raw; | |
92 | struct jffs2_full_dnode *fn; | |
93 | size_t retlen; | |
94 | struct kvec vecs[2]; | |
95 | int ret; | |
96 | int retried = 0; | |
97 | unsigned long cnt = 2; | |
98 | ||
99 | D1(if(je32_to_cpu(ri->hdr_crc) != crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)) { | |
100 | printk(KERN_CRIT "Eep. CRC not correct in jffs2_write_dnode()\n"); | |
101 | BUG(); | |
102 | } | |
103 | ); | |
104 | vecs[0].iov_base = ri; | |
105 | vecs[0].iov_len = sizeof(*ri); | |
106 | vecs[1].iov_base = (unsigned char *)data; | |
107 | vecs[1].iov_len = datalen; | |
108 | ||
109 | D1(writecheck(c, flash_ofs)); | |
110 | ||
111 | if (je32_to_cpu(ri->totlen) != sizeof(*ri) + datalen) { | |
112 | 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); | |
113 | } | |
114 | raw = jffs2_alloc_raw_node_ref(); | |
115 | if (!raw) | |
116 | return ERR_PTR(-ENOMEM); | |
117 | ||
118 | fn = jffs2_alloc_full_dnode(); | |
119 | if (!fn) { | |
120 | jffs2_free_raw_node_ref(raw); | |
121 | return ERR_PTR(-ENOMEM); | |
122 | } | |
123 | ||
124 | fn->ofs = je32_to_cpu(ri->offset); | |
125 | fn->size = je32_to_cpu(ri->dsize); | |
126 | fn->frags = 0; | |
127 | ||
128 | /* check number of valid vecs */ | |
129 | if (!datalen || !data) | |
130 | cnt = 1; | |
131 | retry: | |
132 | fn->raw = raw; | |
133 | ||
134 | raw->flash_offset = flash_ofs; | |
135 | raw->__totlen = PAD(sizeof(*ri)+datalen); | |
136 | raw->next_phys = NULL; | |
137 | ||
9b88f473 EH |
138 | if ((alloc_mode!=ALLOC_GC) && (je32_to_cpu(ri->version) < f->highest_version)) { |
139 | BUG_ON(!retried); | |
140 | D1(printk(KERN_DEBUG "jffs2_write_dnode : dnode_version %d, " | |
141 | "highest version %d -> updating dnode\n", | |
142 | je32_to_cpu(ri->version), f->highest_version)); | |
143 | ri->version = cpu_to_je32(++f->highest_version); | |
144 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); | |
e4803c30 EH |
145 | } |
146 | ||
1da177e4 LT |
147 | ret = jffs2_flash_writev(c, vecs, cnt, flash_ofs, &retlen, |
148 | (alloc_mode==ALLOC_GC)?0:f->inocache->ino); | |
149 | ||
150 | if (ret || (retlen != sizeof(*ri) + datalen)) { | |
151 | printk(KERN_NOTICE "Write of %zd bytes at 0x%08x failed. returned %d, retlen %zd\n", | |
152 | sizeof(*ri)+datalen, flash_ofs, ret, retlen); | |
153 | ||
154 | /* Mark the space as dirtied */ | |
155 | if (retlen) { | |
156 | /* Doesn't belong to any inode */ | |
157 | raw->next_in_ino = NULL; | |
158 | ||
159 | /* Don't change raw->size to match retlen. We may have | |
160 | written the node header already, and only the data will | |
161 | seem corrupted, in which case the scan would skip over | |
162 | any node we write before the original intended end of | |
163 | this node */ | |
164 | raw->flash_offset |= REF_OBSOLETE; | |
165 | jffs2_add_physical_node_ref(c, raw); | |
166 | jffs2_mark_node_obsolete(c, raw); | |
167 | } else { | |
168 | printk(KERN_NOTICE "Not marking the space at 0x%08x as dirty because the flash driver returned retlen zero\n", raw->flash_offset); | |
169 | jffs2_free_raw_node_ref(raw); | |
170 | } | |
171 | if (!retried && alloc_mode != ALLOC_NORETRY && (raw = jffs2_alloc_raw_node_ref())) { | |
172 | /* Try to reallocate space and retry */ | |
173 | uint32_t dummy; | |
174 | struct jffs2_eraseblock *jeb = &c->blocks[flash_ofs / c->sector_size]; | |
175 | ||
176 | retried = 1; | |
177 | ||
178 | D1(printk(KERN_DEBUG "Retrying failed write.\n")); | |
179 | ||
180 | ACCT_SANITY_CHECK(c,jeb); | |
181 | D1(ACCT_PARANOIA_CHECK(jeb)); | |
182 | ||
183 | if (alloc_mode == ALLOC_GC) { | |
184 | ret = jffs2_reserve_space_gc(c, sizeof(*ri) + datalen, &flash_ofs, &dummy); | |
185 | } else { | |
186 | /* Locking pain */ | |
187 | up(&f->sem); | |
188 | jffs2_complete_reservation(c); | |
189 | ||
190 | ret = jffs2_reserve_space(c, sizeof(*ri) + datalen, &flash_ofs, &dummy, alloc_mode); | |
191 | down(&f->sem); | |
192 | } | |
193 | ||
194 | if (!ret) { | |
195 | D1(printk(KERN_DEBUG "Allocated space at 0x%08x to retry failed write.\n", flash_ofs)); | |
196 | ||
197 | ACCT_SANITY_CHECK(c,jeb); | |
198 | D1(ACCT_PARANOIA_CHECK(jeb)); | |
199 | ||
200 | goto retry; | |
201 | } | |
202 | D1(printk(KERN_DEBUG "Failed to allocate space to retry failed write: %d!\n", ret)); | |
203 | jffs2_free_raw_node_ref(raw); | |
204 | } | |
205 | /* Release the full_dnode which is now useless, and return */ | |
206 | jffs2_free_full_dnode(fn); | |
207 | return ERR_PTR(ret?ret:-EIO); | |
208 | } | |
209 | /* Mark the space used */ | |
210 | /* If node covers at least a whole page, or if it starts at the | |
211 | beginning of a page and runs to the end of the file, or if | |
212 | it's a hole node, mark it REF_PRISTINE, else REF_NORMAL. | |
213 | */ | |
214 | if ((je32_to_cpu(ri->dsize) >= PAGE_CACHE_SIZE) || | |
215 | ( ((je32_to_cpu(ri->offset)&(PAGE_CACHE_SIZE-1))==0) && | |
216 | (je32_to_cpu(ri->dsize)+je32_to_cpu(ri->offset) == je32_to_cpu(ri->isize)))) { | |
217 | raw->flash_offset |= REF_PRISTINE; | |
218 | } else { | |
219 | raw->flash_offset |= REF_NORMAL; | |
220 | } | |
221 | jffs2_add_physical_node_ref(c, raw); | |
222 | ||
223 | /* Link into per-inode list */ | |
224 | spin_lock(&c->erase_completion_lock); | |
225 | raw->next_in_ino = f->inocache->nodes; | |
226 | f->inocache->nodes = raw; | |
227 | spin_unlock(&c->erase_completion_lock); | |
228 | ||
229 | 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", | |
230 | flash_ofs, ref_flags(raw), je32_to_cpu(ri->dsize), | |
231 | je32_to_cpu(ri->csize), je32_to_cpu(ri->node_crc), | |
232 | je32_to_cpu(ri->data_crc), je32_to_cpu(ri->totlen))); | |
233 | ||
234 | if (retried) { | |
235 | ACCT_SANITY_CHECK(c,NULL); | |
236 | } | |
237 | ||
238 | return fn; | |
239 | } | |
240 | ||
241 | 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) | |
242 | { | |
243 | struct jffs2_raw_node_ref *raw; | |
244 | struct jffs2_full_dirent *fd; | |
245 | size_t retlen; | |
246 | struct kvec vecs[2]; | |
247 | int retried = 0; | |
248 | int ret; | |
249 | ||
250 | D1(printk(KERN_DEBUG "jffs2_write_dirent(ino #%u, name at *0x%p \"%s\"->ino #%u, name_crc 0x%08x)\n", | |
251 | je32_to_cpu(rd->pino), name, name, je32_to_cpu(rd->ino), | |
252 | je32_to_cpu(rd->name_crc))); | |
253 | D1(writecheck(c, flash_ofs)); | |
254 | ||
255 | D1(if(je32_to_cpu(rd->hdr_crc) != crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)) { | |
256 | printk(KERN_CRIT "Eep. CRC not correct in jffs2_write_dirent()\n"); | |
257 | BUG(); | |
258 | } | |
259 | ); | |
260 | ||
261 | vecs[0].iov_base = rd; | |
262 | vecs[0].iov_len = sizeof(*rd); | |
263 | vecs[1].iov_base = (unsigned char *)name; | |
264 | vecs[1].iov_len = namelen; | |
265 | ||
266 | raw = jffs2_alloc_raw_node_ref(); | |
267 | ||
268 | if (!raw) | |
269 | return ERR_PTR(-ENOMEM); | |
270 | ||
271 | fd = jffs2_alloc_full_dirent(namelen+1); | |
272 | if (!fd) { | |
273 | jffs2_free_raw_node_ref(raw); | |
274 | return ERR_PTR(-ENOMEM); | |
275 | } | |
276 | ||
277 | fd->version = je32_to_cpu(rd->version); | |
278 | fd->ino = je32_to_cpu(rd->ino); | |
279 | fd->nhash = full_name_hash(name, strlen(name)); | |
280 | fd->type = rd->type; | |
281 | memcpy(fd->name, name, namelen); | |
282 | fd->name[namelen]=0; | |
283 | ||
284 | retry: | |
285 | fd->raw = raw; | |
286 | ||
287 | raw->flash_offset = flash_ofs; | |
288 | raw->__totlen = PAD(sizeof(*rd)+namelen); | |
289 | raw->next_phys = NULL; | |
290 | ||
9b88f473 EH |
291 | if ((alloc_mode!=ALLOC_GC) && (je32_to_cpu(rd->version) < f->highest_version)) { |
292 | BUG_ON(!retried); | |
293 | D1(printk(KERN_DEBUG "jffs2_write_dirent : dirent_version %d, " | |
294 | "highest version %d -> updating dirent\n", | |
295 | je32_to_cpu(rd->version), f->highest_version)); | |
296 | rd->version = cpu_to_je32(++f->highest_version); | |
297 | fd->version = je32_to_cpu(rd->version); | |
298 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
e4803c30 EH |
299 | } |
300 | ||
1da177e4 LT |
301 | ret = jffs2_flash_writev(c, vecs, 2, flash_ofs, &retlen, |
302 | (alloc_mode==ALLOC_GC)?0:je32_to_cpu(rd->pino)); | |
303 | if (ret || (retlen != sizeof(*rd) + namelen)) { | |
304 | printk(KERN_NOTICE "Write of %zd bytes at 0x%08x failed. returned %d, retlen %zd\n", | |
305 | sizeof(*rd)+namelen, flash_ofs, ret, retlen); | |
306 | /* Mark the space as dirtied */ | |
307 | if (retlen) { | |
308 | raw->next_in_ino = NULL; | |
309 | raw->flash_offset |= REF_OBSOLETE; | |
310 | jffs2_add_physical_node_ref(c, raw); | |
311 | jffs2_mark_node_obsolete(c, raw); | |
312 | } else { | |
313 | printk(KERN_NOTICE "Not marking the space at 0x%08x as dirty because the flash driver returned retlen zero\n", raw->flash_offset); | |
314 | jffs2_free_raw_node_ref(raw); | |
315 | } | |
316 | if (!retried && (raw = jffs2_alloc_raw_node_ref())) { | |
317 | /* Try to reallocate space and retry */ | |
318 | uint32_t dummy; | |
319 | struct jffs2_eraseblock *jeb = &c->blocks[flash_ofs / c->sector_size]; | |
320 | ||
321 | retried = 1; | |
322 | ||
323 | D1(printk(KERN_DEBUG "Retrying failed write.\n")); | |
324 | ||
325 | ACCT_SANITY_CHECK(c,jeb); | |
326 | D1(ACCT_PARANOIA_CHECK(jeb)); | |
327 | ||
328 | if (alloc_mode == ALLOC_GC) { | |
329 | ret = jffs2_reserve_space_gc(c, sizeof(*rd) + namelen, &flash_ofs, &dummy); | |
330 | } else { | |
331 | /* Locking pain */ | |
332 | up(&f->sem); | |
333 | jffs2_complete_reservation(c); | |
334 | ||
335 | ret = jffs2_reserve_space(c, sizeof(*rd) + namelen, &flash_ofs, &dummy, alloc_mode); | |
336 | down(&f->sem); | |
337 | } | |
338 | ||
339 | if (!ret) { | |
340 | D1(printk(KERN_DEBUG "Allocated space at 0x%08x to retry failed write.\n", flash_ofs)); | |
341 | ACCT_SANITY_CHECK(c,jeb); | |
342 | D1(ACCT_PARANOIA_CHECK(jeb)); | |
343 | goto retry; | |
344 | } | |
345 | D1(printk(KERN_DEBUG "Failed to allocate space to retry failed write: %d!\n", ret)); | |
346 | jffs2_free_raw_node_ref(raw); | |
347 | } | |
348 | /* Release the full_dnode which is now useless, and return */ | |
349 | jffs2_free_full_dirent(fd); | |
350 | return ERR_PTR(ret?ret:-EIO); | |
351 | } | |
352 | /* Mark the space used */ | |
353 | raw->flash_offset |= REF_PRISTINE; | |
354 | jffs2_add_physical_node_ref(c, raw); | |
355 | ||
356 | spin_lock(&c->erase_completion_lock); | |
357 | raw->next_in_ino = f->inocache->nodes; | |
358 | f->inocache->nodes = raw; | |
359 | spin_unlock(&c->erase_completion_lock); | |
360 | ||
361 | if (retried) { | |
362 | ACCT_SANITY_CHECK(c,NULL); | |
363 | } | |
364 | ||
365 | return fd; | |
366 | } | |
367 | ||
368 | /* The OS-specific code fills in the metadata in the jffs2_raw_inode for us, so that | |
369 | we don't have to go digging in struct inode or its equivalent. It should set: | |
370 | mode, uid, gid, (starting)isize, atime, ctime, mtime */ | |
371 | int jffs2_write_inode_range(struct jffs2_sb_info *c, struct jffs2_inode_info *f, | |
372 | struct jffs2_raw_inode *ri, unsigned char *buf, | |
373 | uint32_t offset, uint32_t writelen, uint32_t *retlen) | |
374 | { | |
375 | int ret = 0; | |
376 | uint32_t writtenlen = 0; | |
377 | ||
378 | D1(printk(KERN_DEBUG "jffs2_write_inode_range(): Ino #%u, ofs 0x%x, len 0x%x\n", | |
379 | f->inocache->ino, offset, writelen)); | |
380 | ||
381 | while(writelen) { | |
382 | struct jffs2_full_dnode *fn; | |
383 | unsigned char *comprbuf = NULL; | |
384 | uint16_t comprtype = JFFS2_COMPR_NONE; | |
385 | uint32_t phys_ofs, alloclen; | |
386 | uint32_t datalen, cdatalen; | |
387 | int retried = 0; | |
388 | ||
389 | retry: | |
390 | D2(printk(KERN_DEBUG "jffs2_commit_write() loop: 0x%x to write to 0x%x\n", writelen, offset)); | |
391 | ||
392 | ret = jffs2_reserve_space(c, sizeof(*ri) + JFFS2_MIN_DATA_LEN, &phys_ofs, &alloclen, ALLOC_NORMAL); | |
393 | if (ret) { | |
394 | D1(printk(KERN_DEBUG "jffs2_reserve_space returned %d\n", ret)); | |
395 | break; | |
396 | } | |
397 | down(&f->sem); | |
398 | datalen = min_t(uint32_t, writelen, PAGE_CACHE_SIZE - (offset & (PAGE_CACHE_SIZE-1))); | |
399 | cdatalen = min_t(uint32_t, alloclen - sizeof(*ri), datalen); | |
400 | ||
401 | comprtype = jffs2_compress(c, f, buf, &comprbuf, &datalen, &cdatalen); | |
402 | ||
403 | ri->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
404 | ri->nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE); | |
405 | ri->totlen = cpu_to_je32(sizeof(*ri) + cdatalen); | |
406 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); | |
407 | ||
408 | ri->ino = cpu_to_je32(f->inocache->ino); | |
409 | ri->version = cpu_to_je32(++f->highest_version); | |
410 | ri->isize = cpu_to_je32(max(je32_to_cpu(ri->isize), offset + datalen)); | |
411 | ri->offset = cpu_to_je32(offset); | |
412 | ri->csize = cpu_to_je32(cdatalen); | |
413 | ri->dsize = cpu_to_je32(datalen); | |
414 | ri->compr = comprtype & 0xff; | |
415 | ri->usercompr = (comprtype >> 8 ) & 0xff; | |
416 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); | |
417 | ri->data_crc = cpu_to_je32(crc32(0, comprbuf, cdatalen)); | |
418 | ||
419 | fn = jffs2_write_dnode(c, f, ri, comprbuf, cdatalen, phys_ofs, ALLOC_NORETRY); | |
420 | ||
421 | jffs2_free_comprbuf(comprbuf, buf); | |
422 | ||
423 | if (IS_ERR(fn)) { | |
424 | ret = PTR_ERR(fn); | |
425 | up(&f->sem); | |
426 | jffs2_complete_reservation(c); | |
427 | if (!retried) { | |
428 | /* Write error to be retried */ | |
429 | retried = 1; | |
430 | D1(printk(KERN_DEBUG "Retrying node write in jffs2_write_inode_range()\n")); | |
431 | goto retry; | |
432 | } | |
433 | break; | |
434 | } | |
435 | ret = jffs2_add_full_dnode_to_inode(c, f, fn); | |
436 | if (f->metadata) { | |
437 | jffs2_mark_node_obsolete(c, f->metadata->raw); | |
438 | jffs2_free_full_dnode(f->metadata); | |
439 | f->metadata = NULL; | |
440 | } | |
441 | if (ret) { | |
442 | /* Eep */ | |
443 | D1(printk(KERN_DEBUG "Eep. add_full_dnode_to_inode() failed in commit_write, returned %d\n", ret)); | |
444 | jffs2_mark_node_obsolete(c, fn->raw); | |
445 | jffs2_free_full_dnode(fn); | |
446 | ||
447 | up(&f->sem); | |
448 | jffs2_complete_reservation(c); | |
449 | break; | |
450 | } | |
451 | up(&f->sem); | |
452 | jffs2_complete_reservation(c); | |
453 | if (!datalen) { | |
454 | printk(KERN_WARNING "Eep. We didn't actually write any data in jffs2_write_inode_range()\n"); | |
455 | ret = -EIO; | |
456 | break; | |
457 | } | |
458 | D1(printk(KERN_DEBUG "increasing writtenlen by %d\n", datalen)); | |
459 | writtenlen += datalen; | |
460 | offset += datalen; | |
461 | writelen -= datalen; | |
462 | buf += datalen; | |
463 | } | |
464 | *retlen = writtenlen; | |
465 | return ret; | |
466 | } | |
467 | ||
468 | 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) | |
469 | { | |
470 | struct jffs2_raw_dirent *rd; | |
471 | struct jffs2_full_dnode *fn; | |
472 | struct jffs2_full_dirent *fd; | |
473 | uint32_t alloclen, phys_ofs; | |
474 | int ret; | |
475 | ||
476 | /* Try to reserve enough space for both node and dirent. | |
477 | * Just the node will do for now, though | |
478 | */ | |
479 | ret = jffs2_reserve_space(c, sizeof(*ri), &phys_ofs, &alloclen, ALLOC_NORMAL); | |
480 | D1(printk(KERN_DEBUG "jffs2_do_create(): reserved 0x%x bytes\n", alloclen)); | |
481 | if (ret) { | |
482 | up(&f->sem); | |
483 | return ret; | |
484 | } | |
485 | ||
486 | ri->data_crc = cpu_to_je32(0); | |
487 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); | |
488 | ||
489 | fn = jffs2_write_dnode(c, f, ri, NULL, 0, phys_ofs, ALLOC_NORMAL); | |
490 | ||
491 | D1(printk(KERN_DEBUG "jffs2_do_create created file with mode 0x%x\n", | |
492 | jemode_to_cpu(ri->mode))); | |
493 | ||
494 | if (IS_ERR(fn)) { | |
495 | D1(printk(KERN_DEBUG "jffs2_write_dnode() failed\n")); | |
496 | /* Eeek. Wave bye bye */ | |
497 | up(&f->sem); | |
498 | jffs2_complete_reservation(c); | |
499 | return PTR_ERR(fn); | |
500 | } | |
501 | /* No data here. Only a metadata node, which will be | |
502 | obsoleted by the first data write | |
503 | */ | |
504 | f->metadata = fn; | |
505 | ||
506 | up(&f->sem); | |
507 | jffs2_complete_reservation(c); | |
508 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL); | |
509 | ||
510 | if (ret) { | |
511 | /* Eep. */ | |
512 | D1(printk(KERN_DEBUG "jffs2_reserve_space() for dirent failed\n")); | |
513 | return ret; | |
514 | } | |
515 | ||
516 | rd = jffs2_alloc_raw_dirent(); | |
517 | if (!rd) { | |
518 | /* Argh. Now we treat it like a normal delete */ | |
519 | jffs2_complete_reservation(c); | |
520 | return -ENOMEM; | |
521 | } | |
522 | ||
523 | down(&dir_f->sem); | |
524 | ||
525 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
526 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
527 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
528 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
529 | ||
530 | rd->pino = cpu_to_je32(dir_f->inocache->ino); | |
531 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
532 | rd->ino = ri->ino; | |
533 | rd->mctime = ri->ctime; | |
534 | rd->nsize = namelen; | |
535 | rd->type = DT_REG; | |
536 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
537 | rd->name_crc = cpu_to_je32(crc32(0, name, namelen)); | |
538 | ||
539 | fd = jffs2_write_dirent(c, dir_f, rd, name, namelen, phys_ofs, ALLOC_NORMAL); | |
540 | ||
541 | jffs2_free_raw_dirent(rd); | |
542 | ||
543 | if (IS_ERR(fd)) { | |
544 | /* dirent failed to write. Delete the inode normally | |
545 | as if it were the final unlink() */ | |
546 | jffs2_complete_reservation(c); | |
547 | up(&dir_f->sem); | |
548 | return PTR_ERR(fd); | |
549 | } | |
550 | ||
551 | /* Link the fd into the inode's list, obsoleting an old | |
552 | one if necessary. */ | |
553 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
554 | ||
555 | jffs2_complete_reservation(c); | |
556 | up(&dir_f->sem); | |
557 | ||
558 | return 0; | |
559 | } | |
560 | ||
561 | ||
562 | int jffs2_do_unlink(struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f, | |
563 | const char *name, int namelen, struct jffs2_inode_info *dead_f) | |
564 | { | |
565 | struct jffs2_raw_dirent *rd; | |
566 | struct jffs2_full_dirent *fd; | |
567 | uint32_t alloclen, phys_ofs; | |
568 | int ret; | |
569 | ||
570 | if (1 /* alternative branch needs testing */ || | |
571 | !jffs2_can_mark_obsolete(c)) { | |
572 | /* We can't mark stuff obsolete on the medium. We need to write a deletion dirent */ | |
573 | ||
574 | rd = jffs2_alloc_raw_dirent(); | |
575 | if (!rd) | |
576 | return -ENOMEM; | |
577 | ||
578 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_DELETION); | |
579 | if (ret) { | |
580 | jffs2_free_raw_dirent(rd); | |
581 | return ret; | |
582 | } | |
583 | ||
584 | down(&dir_f->sem); | |
585 | ||
586 | /* Build a deletion node */ | |
587 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
588 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
589 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
590 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
591 | ||
592 | rd->pino = cpu_to_je32(dir_f->inocache->ino); | |
593 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
594 | rd->ino = cpu_to_je32(0); | |
595 | rd->mctime = cpu_to_je32(get_seconds()); | |
596 | rd->nsize = namelen; | |
597 | rd->type = DT_UNKNOWN; | |
598 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
599 | rd->name_crc = cpu_to_je32(crc32(0, name, namelen)); | |
600 | ||
601 | fd = jffs2_write_dirent(c, dir_f, rd, name, namelen, phys_ofs, ALLOC_DELETION); | |
602 | ||
603 | jffs2_free_raw_dirent(rd); | |
604 | ||
605 | if (IS_ERR(fd)) { | |
606 | jffs2_complete_reservation(c); | |
607 | up(&dir_f->sem); | |
608 | return PTR_ERR(fd); | |
609 | } | |
610 | ||
611 | /* File it. This will mark the old one obsolete. */ | |
612 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
613 | up(&dir_f->sem); | |
614 | } else { | |
615 | struct jffs2_full_dirent **prev = &dir_f->dents; | |
616 | uint32_t nhash = full_name_hash(name, namelen); | |
617 | ||
618 | down(&dir_f->sem); | |
619 | ||
620 | while ((*prev) && (*prev)->nhash <= nhash) { | |
621 | if ((*prev)->nhash == nhash && | |
622 | !memcmp((*prev)->name, name, namelen) && | |
623 | !(*prev)->name[namelen]) { | |
624 | struct jffs2_full_dirent *this = *prev; | |
625 | ||
626 | D1(printk(KERN_DEBUG "Marking old dirent node (ino #%u) @%08x obsolete\n", | |
627 | this->ino, ref_offset(this->raw))); | |
628 | ||
629 | *prev = this->next; | |
630 | jffs2_mark_node_obsolete(c, (this->raw)); | |
631 | jffs2_free_full_dirent(this); | |
632 | break; | |
633 | } | |
634 | prev = &((*prev)->next); | |
635 | } | |
636 | up(&dir_f->sem); | |
637 | } | |
638 | ||
639 | /* dead_f is NULL if this was a rename not a real unlink */ | |
640 | /* Also catch the !f->inocache case, where there was a dirent | |
641 | pointing to an inode which didn't exist. */ | |
642 | if (dead_f && dead_f->inocache) { | |
643 | ||
644 | down(&dead_f->sem); | |
645 | ||
32f1a95d AB |
646 | if (S_ISDIR(OFNI_EDONI_2SFFJ(dead_f)->i_mode)) { |
647 | while (dead_f->dents) { | |
648 | /* There can be only deleted ones */ | |
649 | fd = dead_f->dents; | |
650 | ||
651 | dead_f->dents = fd->next; | |
652 | ||
653 | if (fd->ino) { | |
654 | printk(KERN_WARNING "Deleting inode #%u with active dentry \"%s\"->ino #%u\n", | |
655 | dead_f->inocache->ino, fd->name, fd->ino); | |
656 | } else { | |
657 | D1(printk(KERN_DEBUG "Removing deletion dirent for \"%s\" from dir ino #%u\n", | |
658 | fd->name, dead_f->inocache->ino)); | |
659 | } | |
660 | jffs2_mark_node_obsolete(c, fd->raw); | |
661 | jffs2_free_full_dirent(fd); | |
1da177e4 | 662 | } |
1da177e4 LT |
663 | } |
664 | ||
665 | dead_f->inocache->nlink--; | |
666 | /* NB: Caller must set inode nlink if appropriate */ | |
667 | up(&dead_f->sem); | |
668 | } | |
669 | ||
670 | jffs2_complete_reservation(c); | |
671 | ||
672 | return 0; | |
673 | } | |
674 | ||
675 | ||
676 | 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) | |
677 | { | |
678 | struct jffs2_raw_dirent *rd; | |
679 | struct jffs2_full_dirent *fd; | |
680 | uint32_t alloclen, phys_ofs; | |
681 | int ret; | |
682 | ||
683 | rd = jffs2_alloc_raw_dirent(); | |
684 | if (!rd) | |
685 | return -ENOMEM; | |
686 | ||
687 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen, ALLOC_NORMAL); | |
688 | if (ret) { | |
689 | jffs2_free_raw_dirent(rd); | |
690 | return ret; | |
691 | } | |
692 | ||
693 | down(&dir_f->sem); | |
694 | ||
695 | /* Build a deletion node */ | |
696 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
697 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
698 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
699 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
700 | ||
701 | rd->pino = cpu_to_je32(dir_f->inocache->ino); | |
702 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
703 | rd->ino = cpu_to_je32(ino); | |
704 | rd->mctime = cpu_to_je32(get_seconds()); | |
705 | rd->nsize = namelen; | |
706 | ||
707 | rd->type = type; | |
708 | ||
709 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
710 | rd->name_crc = cpu_to_je32(crc32(0, name, namelen)); | |
711 | ||
712 | fd = jffs2_write_dirent(c, dir_f, rd, name, namelen, phys_ofs, ALLOC_NORMAL); | |
713 | ||
714 | jffs2_free_raw_dirent(rd); | |
715 | ||
716 | if (IS_ERR(fd)) { | |
717 | jffs2_complete_reservation(c); | |
718 | up(&dir_f->sem); | |
719 | return PTR_ERR(fd); | |
720 | } | |
721 | ||
722 | /* File it. This will mark the old one obsolete. */ | |
723 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
724 | ||
725 | jffs2_complete_reservation(c); | |
726 | up(&dir_f->sem); | |
727 | ||
728 | return 0; | |
729 | } |