Commit | Line | Data |
---|---|---|
1da177e4 LT |
1 | /* |
2 | * JFFS2 -- Journalling Flash File System, Version 2. | |
3 | * | |
c00c310e | 4 | * Copyright © 2001-2007 Red Hat, Inc. |
1da177e4 LT |
5 | * |
6 | * Created by David Woodhouse <dwmw2@infradead.org> | |
7 | * | |
8 | * For licensing information, see the file 'LICENCE' in this directory. | |
9 | * | |
1da177e4 LT |
10 | */ |
11 | ||
12 | #include <linux/kernel.h> | |
13 | #include <linux/fs.h> | |
14 | #include <linux/crc32.h> | |
15 | #include <linux/slab.h> | |
16 | #include <linux/pagemap.h> | |
17 | #include <linux/mtd/mtd.h> | |
18 | #include "nodelist.h" | |
19 | #include "compr.h" | |
20 | ||
21 | ||
22 | int jffs2_do_new_inode(struct jffs2_sb_info *c, struct jffs2_inode_info *f, uint32_t mode, struct jffs2_raw_inode *ri) | |
23 | { | |
24 | struct jffs2_inode_cache *ic; | |
25 | ||
26 | ic = jffs2_alloc_inode_cache(); | |
27 | if (!ic) { | |
28 | return -ENOMEM; | |
29 | } | |
30 | ||
31 | memset(ic, 0, sizeof(*ic)); | |
32 | ||
33 | f->inocache = ic; | |
34 | f->inocache->nlink = 1; | |
35 | f->inocache->nodes = (struct jffs2_raw_node_ref *)f->inocache; | |
1da177e4 | 36 | f->inocache->state = INO_STATE_PRESENT; |
1da177e4 | 37 | |
1da177e4 | 38 | jffs2_add_ino_cache(c, f->inocache); |
7d200960 DW |
39 | D1(printk(KERN_DEBUG "jffs2_do_new_inode(): Assigned ino# %d\n", f->inocache->ino)); |
40 | ri->ino = cpu_to_je32(f->inocache->ino); | |
1da177e4 LT |
41 | |
42 | ri->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
43 | ri->nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE); | |
44 | ri->totlen = cpu_to_je32(PAD(sizeof(*ri))); | |
45 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); | |
46 | ri->mode = cpu_to_jemode(mode); | |
47 | ||
48 | f->highest_version = 1; | |
49 | ri->version = cpu_to_je32(f->highest_version); | |
50 | ||
51 | return 0; | |
52 | } | |
53 | ||
182ec4ee | 54 | /* jffs2_write_dnode - given a raw_inode, allocate a full_dnode for it, |
1da177e4 LT |
55 | write it to the flash, link it into the existing inode/fragment list */ |
56 | ||
9fe4854c DW |
57 | struct jffs2_full_dnode *jffs2_write_dnode(struct jffs2_sb_info *c, struct jffs2_inode_info *f, |
58 | struct jffs2_raw_inode *ri, const unsigned char *data, | |
59 | uint32_t datalen, int alloc_mode) | |
1da177e4 LT |
60 | |
61 | { | |
1da177e4 LT |
62 | struct jffs2_full_dnode *fn; |
63 | size_t retlen; | |
9fe4854c | 64 | uint32_t flash_ofs; |
1da177e4 LT |
65 | struct kvec vecs[2]; |
66 | int ret; | |
67 | int retried = 0; | |
68 | unsigned long cnt = 2; | |
69 | ||
70 | D1(if(je32_to_cpu(ri->hdr_crc) != crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)) { | |
71 | printk(KERN_CRIT "Eep. CRC not correct in jffs2_write_dnode()\n"); | |
72 | BUG(); | |
73 | } | |
74 | ); | |
75 | vecs[0].iov_base = ri; | |
76 | vecs[0].iov_len = sizeof(*ri); | |
77 | vecs[1].iov_base = (unsigned char *)data; | |
78 | vecs[1].iov_len = datalen; | |
79 | ||
1da177e4 LT |
80 | if (je32_to_cpu(ri->totlen) != sizeof(*ri) + datalen) { |
81 | 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); | |
82 | } | |
182ec4ee | 83 | |
1da177e4 | 84 | fn = jffs2_alloc_full_dnode(); |
2f785402 | 85 | if (!fn) |
1da177e4 | 86 | return ERR_PTR(-ENOMEM); |
1da177e4 LT |
87 | |
88 | /* check number of valid vecs */ | |
89 | if (!datalen || !data) | |
90 | cnt = 1; | |
91 | retry: | |
2f785402 | 92 | flash_ofs = write_ofs(c); |
9fe4854c DW |
93 | |
94 | jffs2_dbg_prewrite_paranoia_check(c, flash_ofs, vecs[0].iov_len + vecs[1].iov_len); | |
1da177e4 | 95 | |
9b88f473 EH |
96 | if ((alloc_mode!=ALLOC_GC) && (je32_to_cpu(ri->version) < f->highest_version)) { |
97 | BUG_ON(!retried); | |
98 | D1(printk(KERN_DEBUG "jffs2_write_dnode : dnode_version %d, " | |
182ec4ee | 99 | "highest version %d -> updating dnode\n", |
9b88f473 EH |
100 | je32_to_cpu(ri->version), f->highest_version)); |
101 | ri->version = cpu_to_je32(++f->highest_version); | |
102 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); | |
e4803c30 EH |
103 | } |
104 | ||
1da177e4 LT |
105 | ret = jffs2_flash_writev(c, vecs, cnt, flash_ofs, &retlen, |
106 | (alloc_mode==ALLOC_GC)?0:f->inocache->ino); | |
107 | ||
108 | if (ret || (retlen != sizeof(*ri) + datalen)) { | |
182ec4ee | 109 | printk(KERN_NOTICE "Write of %zd bytes at 0x%08x failed. returned %d, retlen %zd\n", |
1da177e4 LT |
110 | sizeof(*ri)+datalen, flash_ofs, ret, retlen); |
111 | ||
112 | /* Mark the space as dirtied */ | |
113 | if (retlen) { | |
182ec4ee | 114 | /* Don't change raw->size to match retlen. We may have |
1da177e4 LT |
115 | written the node header already, and only the data will |
116 | seem corrupted, in which case the scan would skip over | |
182ec4ee | 117 | any node we write before the original intended end of |
1da177e4 | 118 | this node */ |
2f785402 | 119 | jffs2_add_physical_node_ref(c, flash_ofs | REF_OBSOLETE, PAD(sizeof(*ri)+datalen), NULL); |
1da177e4 | 120 | } else { |
2f785402 | 121 | printk(KERN_NOTICE "Not marking the space at 0x%08x as dirty because the flash driver returned retlen zero\n", flash_ofs); |
1da177e4 | 122 | } |
2f785402 | 123 | if (!retried && alloc_mode != ALLOC_NORETRY) { |
1da177e4 LT |
124 | /* Try to reallocate space and retry */ |
125 | uint32_t dummy; | |
126 | struct jffs2_eraseblock *jeb = &c->blocks[flash_ofs / c->sector_size]; | |
127 | ||
128 | retried = 1; | |
129 | ||
130 | D1(printk(KERN_DEBUG "Retrying failed write.\n")); | |
182ec4ee | 131 | |
730554d9 AB |
132 | jffs2_dbg_acct_sanity_check(c,jeb); |
133 | jffs2_dbg_acct_paranoia_check(c, jeb); | |
1da177e4 LT |
134 | |
135 | if (alloc_mode == ALLOC_GC) { | |
9fe4854c DW |
136 | ret = jffs2_reserve_space_gc(c, sizeof(*ri) + datalen, &dummy, |
137 | JFFS2_SUMMARY_INODE_SIZE); | |
1da177e4 LT |
138 | } else { |
139 | /* Locking pain */ | |
140 | up(&f->sem); | |
141 | jffs2_complete_reservation(c); | |
182ec4ee | 142 | |
9fe4854c DW |
143 | ret = jffs2_reserve_space(c, sizeof(*ri) + datalen, &dummy, |
144 | alloc_mode, JFFS2_SUMMARY_INODE_SIZE); | |
1da177e4 LT |
145 | down(&f->sem); |
146 | } | |
147 | ||
148 | if (!ret) { | |
9fe4854c | 149 | flash_ofs = write_ofs(c); |
1da177e4 LT |
150 | D1(printk(KERN_DEBUG "Allocated space at 0x%08x to retry failed write.\n", flash_ofs)); |
151 | ||
730554d9 AB |
152 | jffs2_dbg_acct_sanity_check(c,jeb); |
153 | jffs2_dbg_acct_paranoia_check(c, jeb); | |
1da177e4 LT |
154 | |
155 | goto retry; | |
156 | } | |
157 | D1(printk(KERN_DEBUG "Failed to allocate space to retry failed write: %d!\n", ret)); | |
1da177e4 LT |
158 | } |
159 | /* Release the full_dnode which is now useless, and return */ | |
160 | jffs2_free_full_dnode(fn); | |
161 | return ERR_PTR(ret?ret:-EIO); | |
162 | } | |
163 | /* Mark the space used */ | |
182ec4ee TG |
164 | /* If node covers at least a whole page, or if it starts at the |
165 | beginning of a page and runs to the end of the file, or if | |
166 | it's a hole node, mark it REF_PRISTINE, else REF_NORMAL. | |
1da177e4 LT |
167 | */ |
168 | if ((je32_to_cpu(ri->dsize) >= PAGE_CACHE_SIZE) || | |
169 | ( ((je32_to_cpu(ri->offset)&(PAGE_CACHE_SIZE-1))==0) && | |
170 | (je32_to_cpu(ri->dsize)+je32_to_cpu(ri->offset) == je32_to_cpu(ri->isize)))) { | |
2f785402 | 171 | flash_ofs |= REF_PRISTINE; |
1da177e4 | 172 | } else { |
2f785402 | 173 | flash_ofs |= REF_NORMAL; |
1da177e4 | 174 | } |
2f785402 | 175 | fn->raw = jffs2_add_physical_node_ref(c, flash_ofs, PAD(sizeof(*ri)+datalen), f->inocache); |
5bd5c03c JT |
176 | if (IS_ERR(fn->raw)) { |
177 | void *hold_err = fn->raw; | |
178 | /* Release the full_dnode which is now useless, and return */ | |
179 | jffs2_free_full_dnode(fn); | |
180 | return ERR_PTR(PTR_ERR(hold_err)); | |
181 | } | |
2f785402 DW |
182 | fn->ofs = je32_to_cpu(ri->offset); |
183 | fn->size = je32_to_cpu(ri->dsize); | |
184 | fn->frags = 0; | |
1da177e4 LT |
185 | |
186 | 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", | |
2f785402 | 187 | flash_ofs & ~3, flash_ofs & 3, je32_to_cpu(ri->dsize), |
1da177e4 LT |
188 | je32_to_cpu(ri->csize), je32_to_cpu(ri->node_crc), |
189 | je32_to_cpu(ri->data_crc), je32_to_cpu(ri->totlen))); | |
190 | ||
191 | if (retried) { | |
730554d9 | 192 | jffs2_dbg_acct_sanity_check(c,NULL); |
1da177e4 LT |
193 | } |
194 | ||
195 | return fn; | |
196 | } | |
197 | ||
9fe4854c DW |
198 | struct jffs2_full_dirent *jffs2_write_dirent(struct jffs2_sb_info *c, struct jffs2_inode_info *f, |
199 | struct jffs2_raw_dirent *rd, const unsigned char *name, | |
200 | uint32_t namelen, int alloc_mode) | |
1da177e4 | 201 | { |
1da177e4 LT |
202 | struct jffs2_full_dirent *fd; |
203 | size_t retlen; | |
204 | struct kvec vecs[2]; | |
2f785402 | 205 | uint32_t flash_ofs; |
1da177e4 LT |
206 | int retried = 0; |
207 | int ret; | |
208 | ||
182ec4ee | 209 | D1(printk(KERN_DEBUG "jffs2_write_dirent(ino #%u, name at *0x%p \"%s\"->ino #%u, name_crc 0x%08x)\n", |
1da177e4 LT |
210 | je32_to_cpu(rd->pino), name, name, je32_to_cpu(rd->ino), |
211 | je32_to_cpu(rd->name_crc))); | |
730554d9 | 212 | |
1da177e4 LT |
213 | D1(if(je32_to_cpu(rd->hdr_crc) != crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)) { |
214 | printk(KERN_CRIT "Eep. CRC not correct in jffs2_write_dirent()\n"); | |
215 | BUG(); | |
2f785402 | 216 | }); |
1da177e4 LT |
217 | |
218 | vecs[0].iov_base = rd; | |
219 | vecs[0].iov_len = sizeof(*rd); | |
220 | vecs[1].iov_base = (unsigned char *)name; | |
221 | vecs[1].iov_len = namelen; | |
182ec4ee | 222 | |
1da177e4 | 223 | fd = jffs2_alloc_full_dirent(namelen+1); |
2f785402 | 224 | if (!fd) |
1da177e4 | 225 | return ERR_PTR(-ENOMEM); |
1da177e4 LT |
226 | |
227 | fd->version = je32_to_cpu(rd->version); | |
228 | fd->ino = je32_to_cpu(rd->ino); | |
229 | fd->nhash = full_name_hash(name, strlen(name)); | |
230 | fd->type = rd->type; | |
231 | memcpy(fd->name, name, namelen); | |
232 | fd->name[namelen]=0; | |
233 | ||
234 | retry: | |
2f785402 | 235 | flash_ofs = write_ofs(c); |
1da177e4 | 236 | |
2f785402 | 237 | jffs2_dbg_prewrite_paranoia_check(c, flash_ofs, vecs[0].iov_len + vecs[1].iov_len); |
1da177e4 | 238 | |
9b88f473 EH |
239 | if ((alloc_mode!=ALLOC_GC) && (je32_to_cpu(rd->version) < f->highest_version)) { |
240 | BUG_ON(!retried); | |
241 | D1(printk(KERN_DEBUG "jffs2_write_dirent : dirent_version %d, " | |
242 | "highest version %d -> updating dirent\n", | |
243 | je32_to_cpu(rd->version), f->highest_version)); | |
244 | rd->version = cpu_to_je32(++f->highest_version); | |
245 | fd->version = je32_to_cpu(rd->version); | |
246 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
e4803c30 EH |
247 | } |
248 | ||
1da177e4 LT |
249 | ret = jffs2_flash_writev(c, vecs, 2, flash_ofs, &retlen, |
250 | (alloc_mode==ALLOC_GC)?0:je32_to_cpu(rd->pino)); | |
251 | if (ret || (retlen != sizeof(*rd) + namelen)) { | |
182ec4ee | 252 | printk(KERN_NOTICE "Write of %zd bytes at 0x%08x failed. returned %d, retlen %zd\n", |
1da177e4 LT |
253 | sizeof(*rd)+namelen, flash_ofs, ret, retlen); |
254 | /* Mark the space as dirtied */ | |
255 | if (retlen) { | |
2f785402 | 256 | jffs2_add_physical_node_ref(c, flash_ofs | REF_OBSOLETE, PAD(sizeof(*rd)+namelen), NULL); |
1da177e4 | 257 | } else { |
2f785402 | 258 | printk(KERN_NOTICE "Not marking the space at 0x%08x as dirty because the flash driver returned retlen zero\n", flash_ofs); |
1da177e4 | 259 | } |
2f785402 | 260 | if (!retried) { |
1da177e4 LT |
261 | /* Try to reallocate space and retry */ |
262 | uint32_t dummy; | |
263 | struct jffs2_eraseblock *jeb = &c->blocks[flash_ofs / c->sector_size]; | |
264 | ||
265 | retried = 1; | |
266 | ||
267 | D1(printk(KERN_DEBUG "Retrying failed write.\n")); | |
268 | ||
730554d9 AB |
269 | jffs2_dbg_acct_sanity_check(c,jeb); |
270 | jffs2_dbg_acct_paranoia_check(c, jeb); | |
1da177e4 LT |
271 | |
272 | if (alloc_mode == ALLOC_GC) { | |
9fe4854c DW |
273 | ret = jffs2_reserve_space_gc(c, sizeof(*rd) + namelen, &dummy, |
274 | JFFS2_SUMMARY_DIRENT_SIZE(namelen)); | |
1da177e4 LT |
275 | } else { |
276 | /* Locking pain */ | |
277 | up(&f->sem); | |
278 | jffs2_complete_reservation(c); | |
182ec4ee | 279 | |
9fe4854c DW |
280 | ret = jffs2_reserve_space(c, sizeof(*rd) + namelen, &dummy, |
281 | alloc_mode, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); | |
1da177e4 LT |
282 | down(&f->sem); |
283 | } | |
284 | ||
285 | if (!ret) { | |
9fe4854c | 286 | flash_ofs = write_ofs(c); |
1da177e4 | 287 | D1(printk(KERN_DEBUG "Allocated space at 0x%08x to retry failed write.\n", flash_ofs)); |
730554d9 AB |
288 | jffs2_dbg_acct_sanity_check(c,jeb); |
289 | jffs2_dbg_acct_paranoia_check(c, jeb); | |
1da177e4 LT |
290 | goto retry; |
291 | } | |
292 | D1(printk(KERN_DEBUG "Failed to allocate space to retry failed write: %d!\n", ret)); | |
1da177e4 LT |
293 | } |
294 | /* Release the full_dnode which is now useless, and return */ | |
295 | jffs2_free_full_dirent(fd); | |
296 | return ERR_PTR(ret?ret:-EIO); | |
297 | } | |
298 | /* Mark the space used */ | |
2f785402 | 299 | fd->raw = jffs2_add_physical_node_ref(c, flash_ofs | REF_PRISTINE, PAD(sizeof(*rd)+namelen), f->inocache); |
5bd5c03c JT |
300 | if (IS_ERR(fd->raw)) { |
301 | void *hold_err = fd->raw; | |
302 | /* Release the full_dirent which is now useless, and return */ | |
303 | jffs2_free_full_dirent(fd); | |
304 | return ERR_PTR(PTR_ERR(hold_err)); | |
305 | } | |
1da177e4 LT |
306 | |
307 | if (retried) { | |
730554d9 | 308 | jffs2_dbg_acct_sanity_check(c,NULL); |
1da177e4 LT |
309 | } |
310 | ||
311 | return fd; | |
312 | } | |
313 | ||
314 | /* The OS-specific code fills in the metadata in the jffs2_raw_inode for us, so that | |
315 | we don't have to go digging in struct inode or its equivalent. It should set: | |
316 | mode, uid, gid, (starting)isize, atime, ctime, mtime */ | |
317 | int jffs2_write_inode_range(struct jffs2_sb_info *c, struct jffs2_inode_info *f, | |
182ec4ee | 318 | struct jffs2_raw_inode *ri, unsigned char *buf, |
1da177e4 LT |
319 | uint32_t offset, uint32_t writelen, uint32_t *retlen) |
320 | { | |
321 | int ret = 0; | |
322 | uint32_t writtenlen = 0; | |
323 | ||
324 | D1(printk(KERN_DEBUG "jffs2_write_inode_range(): Ino #%u, ofs 0x%x, len 0x%x\n", | |
325 | f->inocache->ino, offset, writelen)); | |
182ec4ee | 326 | |
1da177e4 LT |
327 | while(writelen) { |
328 | struct jffs2_full_dnode *fn; | |
329 | unsigned char *comprbuf = NULL; | |
330 | uint16_t comprtype = JFFS2_COMPR_NONE; | |
9fe4854c | 331 | uint32_t alloclen; |
1da177e4 LT |
332 | uint32_t datalen, cdatalen; |
333 | int retried = 0; | |
334 | ||
335 | retry: | |
336 | D2(printk(KERN_DEBUG "jffs2_commit_write() loop: 0x%x to write to 0x%x\n", writelen, offset)); | |
337 | ||
9fe4854c | 338 | ret = jffs2_reserve_space(c, sizeof(*ri) + JFFS2_MIN_DATA_LEN, |
e631ddba | 339 | &alloclen, ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); |
1da177e4 LT |
340 | if (ret) { |
341 | D1(printk(KERN_DEBUG "jffs2_reserve_space returned %d\n", ret)); | |
342 | break; | |
343 | } | |
344 | down(&f->sem); | |
345 | datalen = min_t(uint32_t, writelen, PAGE_CACHE_SIZE - (offset & (PAGE_CACHE_SIZE-1))); | |
346 | cdatalen = min_t(uint32_t, alloclen - sizeof(*ri), datalen); | |
347 | ||
348 | comprtype = jffs2_compress(c, f, buf, &comprbuf, &datalen, &cdatalen); | |
349 | ||
350 | ri->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
351 | ri->nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE); | |
352 | ri->totlen = cpu_to_je32(sizeof(*ri) + cdatalen); | |
353 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); | |
354 | ||
355 | ri->ino = cpu_to_je32(f->inocache->ino); | |
356 | ri->version = cpu_to_je32(++f->highest_version); | |
357 | ri->isize = cpu_to_je32(max(je32_to_cpu(ri->isize), offset + datalen)); | |
358 | ri->offset = cpu_to_je32(offset); | |
359 | ri->csize = cpu_to_je32(cdatalen); | |
360 | ri->dsize = cpu_to_je32(datalen); | |
361 | ri->compr = comprtype & 0xff; | |
362 | ri->usercompr = (comprtype >> 8 ) & 0xff; | |
363 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); | |
364 | ri->data_crc = cpu_to_je32(crc32(0, comprbuf, cdatalen)); | |
365 | ||
9fe4854c | 366 | fn = jffs2_write_dnode(c, f, ri, comprbuf, cdatalen, ALLOC_NORETRY); |
1da177e4 LT |
367 | |
368 | jffs2_free_comprbuf(comprbuf, buf); | |
369 | ||
370 | if (IS_ERR(fn)) { | |
371 | ret = PTR_ERR(fn); | |
372 | up(&f->sem); | |
373 | jffs2_complete_reservation(c); | |
374 | if (!retried) { | |
375 | /* Write error to be retried */ | |
376 | retried = 1; | |
377 | D1(printk(KERN_DEBUG "Retrying node write in jffs2_write_inode_range()\n")); | |
378 | goto retry; | |
379 | } | |
380 | break; | |
381 | } | |
382 | ret = jffs2_add_full_dnode_to_inode(c, f, fn); | |
383 | if (f->metadata) { | |
384 | jffs2_mark_node_obsolete(c, f->metadata->raw); | |
385 | jffs2_free_full_dnode(f->metadata); | |
386 | f->metadata = NULL; | |
387 | } | |
388 | if (ret) { | |
389 | /* Eep */ | |
390 | D1(printk(KERN_DEBUG "Eep. add_full_dnode_to_inode() failed in commit_write, returned %d\n", ret)); | |
391 | jffs2_mark_node_obsolete(c, fn->raw); | |
392 | jffs2_free_full_dnode(fn); | |
393 | ||
394 | up(&f->sem); | |
395 | jffs2_complete_reservation(c); | |
396 | break; | |
397 | } | |
398 | up(&f->sem); | |
399 | jffs2_complete_reservation(c); | |
400 | if (!datalen) { | |
401 | printk(KERN_WARNING "Eep. We didn't actually write any data in jffs2_write_inode_range()\n"); | |
402 | ret = -EIO; | |
403 | break; | |
404 | } | |
405 | D1(printk(KERN_DEBUG "increasing writtenlen by %d\n", datalen)); | |
406 | writtenlen += datalen; | |
407 | offset += datalen; | |
408 | writelen -= datalen; | |
409 | buf += datalen; | |
410 | } | |
411 | *retlen = writtenlen; | |
412 | return ret; | |
413 | } | |
414 | ||
415 | 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) | |
416 | { | |
417 | struct jffs2_raw_dirent *rd; | |
418 | struct jffs2_full_dnode *fn; | |
419 | struct jffs2_full_dirent *fd; | |
9fe4854c | 420 | uint32_t alloclen; |
1da177e4 LT |
421 | int ret; |
422 | ||
182ec4ee TG |
423 | /* Try to reserve enough space for both node and dirent. |
424 | * Just the node will do for now, though | |
1da177e4 | 425 | */ |
9fe4854c | 426 | ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL, |
e631ddba | 427 | JFFS2_SUMMARY_INODE_SIZE); |
1da177e4 LT |
428 | D1(printk(KERN_DEBUG "jffs2_do_create(): reserved 0x%x bytes\n", alloclen)); |
429 | if (ret) { | |
430 | up(&f->sem); | |
431 | return ret; | |
432 | } | |
433 | ||
434 | ri->data_crc = cpu_to_je32(0); | |
435 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); | |
436 | ||
9fe4854c | 437 | fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL); |
1da177e4 LT |
438 | |
439 | D1(printk(KERN_DEBUG "jffs2_do_create created file with mode 0x%x\n", | |
440 | jemode_to_cpu(ri->mode))); | |
441 | ||
442 | if (IS_ERR(fn)) { | |
443 | D1(printk(KERN_DEBUG "jffs2_write_dnode() failed\n")); | |
444 | /* Eeek. Wave bye bye */ | |
445 | up(&f->sem); | |
446 | jffs2_complete_reservation(c); | |
447 | return PTR_ERR(fn); | |
448 | } | |
182ec4ee | 449 | /* No data here. Only a metadata node, which will be |
1da177e4 LT |
450 | obsoleted by the first data write |
451 | */ | |
452 | f->metadata = fn; | |
453 | ||
454 | up(&f->sem); | |
455 | jffs2_complete_reservation(c); | |
9fe4854c | 456 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
e631ddba | 457 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); |
182ec4ee | 458 | |
1da177e4 LT |
459 | if (ret) { |
460 | /* Eep. */ | |
461 | D1(printk(KERN_DEBUG "jffs2_reserve_space() for dirent failed\n")); | |
462 | return ret; | |
463 | } | |
464 | ||
465 | rd = jffs2_alloc_raw_dirent(); | |
466 | if (!rd) { | |
467 | /* Argh. Now we treat it like a normal delete */ | |
468 | jffs2_complete_reservation(c); | |
469 | return -ENOMEM; | |
470 | } | |
471 | ||
472 | down(&dir_f->sem); | |
473 | ||
474 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
475 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
476 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
477 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
478 | ||
479 | rd->pino = cpu_to_je32(dir_f->inocache->ino); | |
480 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
481 | rd->ino = ri->ino; | |
482 | rd->mctime = ri->ctime; | |
483 | rd->nsize = namelen; | |
484 | rd->type = DT_REG; | |
485 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
486 | rd->name_crc = cpu_to_je32(crc32(0, name, namelen)); | |
487 | ||
9fe4854c | 488 | fd = jffs2_write_dirent(c, dir_f, rd, name, namelen, ALLOC_NORMAL); |
1da177e4 LT |
489 | |
490 | jffs2_free_raw_dirent(rd); | |
182ec4ee | 491 | |
1da177e4 | 492 | if (IS_ERR(fd)) { |
182ec4ee | 493 | /* dirent failed to write. Delete the inode normally |
1da177e4 LT |
494 | as if it were the final unlink() */ |
495 | jffs2_complete_reservation(c); | |
496 | up(&dir_f->sem); | |
497 | return PTR_ERR(fd); | |
498 | } | |
499 | ||
500 | /* Link the fd into the inode's list, obsoleting an old | |
501 | one if necessary. */ | |
502 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
503 | ||
504 | jffs2_complete_reservation(c); | |
505 | up(&dir_f->sem); | |
506 | ||
507 | return 0; | |
508 | } | |
509 | ||
510 | ||
511 | int jffs2_do_unlink(struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f, | |
3a69e0cd AB |
512 | const char *name, int namelen, struct jffs2_inode_info *dead_f, |
513 | uint32_t time) | |
1da177e4 LT |
514 | { |
515 | struct jffs2_raw_dirent *rd; | |
516 | struct jffs2_full_dirent *fd; | |
9fe4854c | 517 | uint32_t alloclen; |
1da177e4 LT |
518 | int ret; |
519 | ||
a491486a | 520 | if (!jffs2_can_mark_obsolete(c)) { |
1da177e4 LT |
521 | /* We can't mark stuff obsolete on the medium. We need to write a deletion dirent */ |
522 | ||
523 | rd = jffs2_alloc_raw_dirent(); | |
524 | if (!rd) | |
525 | return -ENOMEM; | |
526 | ||
9fe4854c | 527 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
e631ddba | 528 | ALLOC_DELETION, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); |
1da177e4 LT |
529 | if (ret) { |
530 | jffs2_free_raw_dirent(rd); | |
531 | return ret; | |
532 | } | |
533 | ||
534 | down(&dir_f->sem); | |
535 | ||
536 | /* Build a deletion node */ | |
537 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
538 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
539 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
540 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
182ec4ee | 541 | |
1da177e4 LT |
542 | rd->pino = cpu_to_je32(dir_f->inocache->ino); |
543 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
544 | rd->ino = cpu_to_je32(0); | |
3a69e0cd | 545 | rd->mctime = cpu_to_je32(time); |
1da177e4 LT |
546 | rd->nsize = namelen; |
547 | rd->type = DT_UNKNOWN; | |
548 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
549 | rd->name_crc = cpu_to_je32(crc32(0, name, namelen)); | |
550 | ||
9fe4854c | 551 | fd = jffs2_write_dirent(c, dir_f, rd, name, namelen, ALLOC_DELETION); |
182ec4ee | 552 | |
1da177e4 LT |
553 | jffs2_free_raw_dirent(rd); |
554 | ||
555 | if (IS_ERR(fd)) { | |
556 | jffs2_complete_reservation(c); | |
557 | up(&dir_f->sem); | |
558 | return PTR_ERR(fd); | |
559 | } | |
560 | ||
561 | /* File it. This will mark the old one obsolete. */ | |
562 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
563 | up(&dir_f->sem); | |
564 | } else { | |
565 | struct jffs2_full_dirent **prev = &dir_f->dents; | |
566 | uint32_t nhash = full_name_hash(name, namelen); | |
567 | ||
568 | down(&dir_f->sem); | |
569 | ||
570 | while ((*prev) && (*prev)->nhash <= nhash) { | |
182ec4ee | 571 | if ((*prev)->nhash == nhash && |
1da177e4 LT |
572 | !memcmp((*prev)->name, name, namelen) && |
573 | !(*prev)->name[namelen]) { | |
574 | struct jffs2_full_dirent *this = *prev; | |
575 | ||
576 | D1(printk(KERN_DEBUG "Marking old dirent node (ino #%u) @%08x obsolete\n", | |
577 | this->ino, ref_offset(this->raw))); | |
578 | ||
579 | *prev = this->next; | |
580 | jffs2_mark_node_obsolete(c, (this->raw)); | |
581 | jffs2_free_full_dirent(this); | |
582 | break; | |
583 | } | |
584 | prev = &((*prev)->next); | |
585 | } | |
586 | up(&dir_f->sem); | |
587 | } | |
588 | ||
589 | /* dead_f is NULL if this was a rename not a real unlink */ | |
590 | /* Also catch the !f->inocache case, where there was a dirent | |
591 | pointing to an inode which didn't exist. */ | |
182ec4ee | 592 | if (dead_f && dead_f->inocache) { |
1da177e4 LT |
593 | |
594 | down(&dead_f->sem); | |
595 | ||
32f1a95d AB |
596 | if (S_ISDIR(OFNI_EDONI_2SFFJ(dead_f)->i_mode)) { |
597 | while (dead_f->dents) { | |
598 | /* There can be only deleted ones */ | |
599 | fd = dead_f->dents; | |
182ec4ee | 600 | |
32f1a95d | 601 | dead_f->dents = fd->next; |
182ec4ee | 602 | |
32f1a95d AB |
603 | if (fd->ino) { |
604 | printk(KERN_WARNING "Deleting inode #%u with active dentry \"%s\"->ino #%u\n", | |
605 | dead_f->inocache->ino, fd->name, fd->ino); | |
606 | } else { | |
607 | D1(printk(KERN_DEBUG "Removing deletion dirent for \"%s\" from dir ino #%u\n", | |
608 | fd->name, dead_f->inocache->ino)); | |
609 | } | |
610 | jffs2_mark_node_obsolete(c, fd->raw); | |
611 | jffs2_free_full_dirent(fd); | |
1da177e4 | 612 | } |
1da177e4 LT |
613 | } |
614 | ||
615 | dead_f->inocache->nlink--; | |
616 | /* NB: Caller must set inode nlink if appropriate */ | |
617 | up(&dead_f->sem); | |
618 | } | |
619 | ||
620 | jffs2_complete_reservation(c); | |
621 | ||
622 | return 0; | |
623 | } | |
624 | ||
625 | ||
3a69e0cd | 626 | 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) |
1da177e4 LT |
627 | { |
628 | struct jffs2_raw_dirent *rd; | |
629 | struct jffs2_full_dirent *fd; | |
9fe4854c | 630 | uint32_t alloclen; |
1da177e4 LT |
631 | int ret; |
632 | ||
633 | rd = jffs2_alloc_raw_dirent(); | |
634 | if (!rd) | |
635 | return -ENOMEM; | |
636 | ||
9fe4854c | 637 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
e631ddba | 638 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); |
1da177e4 LT |
639 | if (ret) { |
640 | jffs2_free_raw_dirent(rd); | |
641 | return ret; | |
642 | } | |
182ec4ee | 643 | |
1da177e4 LT |
644 | down(&dir_f->sem); |
645 | ||
646 | /* Build a deletion node */ | |
647 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
648 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
649 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
650 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
651 | ||
652 | rd->pino = cpu_to_je32(dir_f->inocache->ino); | |
653 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
654 | rd->ino = cpu_to_je32(ino); | |
3a69e0cd | 655 | rd->mctime = cpu_to_je32(time); |
1da177e4 LT |
656 | rd->nsize = namelen; |
657 | ||
658 | rd->type = type; | |
659 | ||
660 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
661 | rd->name_crc = cpu_to_je32(crc32(0, name, namelen)); | |
662 | ||
9fe4854c | 663 | fd = jffs2_write_dirent(c, dir_f, rd, name, namelen, ALLOC_NORMAL); |
182ec4ee | 664 | |
1da177e4 LT |
665 | jffs2_free_raw_dirent(rd); |
666 | ||
667 | if (IS_ERR(fd)) { | |
668 | jffs2_complete_reservation(c); | |
669 | up(&dir_f->sem); | |
670 | return PTR_ERR(fd); | |
671 | } | |
672 | ||
673 | /* File it. This will mark the old one obsolete. */ | |
674 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
675 | ||
676 | jffs2_complete_reservation(c); | |
677 | up(&dir_f->sem); | |
678 | ||
679 | return 0; | |
680 | } |