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Commit | Line | Data |
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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 DW |
175 | fn->raw = jffs2_add_physical_node_ref(c, flash_ofs, PAD(sizeof(*ri)+datalen), f->inocache); |
176 | fn->ofs = je32_to_cpu(ri->offset); | |
177 | fn->size = je32_to_cpu(ri->dsize); | |
178 | fn->frags = 0; | |
1da177e4 LT |
179 | |
180 | 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 | 181 | flash_ofs & ~3, flash_ofs & 3, je32_to_cpu(ri->dsize), |
1da177e4 LT |
182 | je32_to_cpu(ri->csize), je32_to_cpu(ri->node_crc), |
183 | je32_to_cpu(ri->data_crc), je32_to_cpu(ri->totlen))); | |
184 | ||
185 | if (retried) { | |
730554d9 | 186 | jffs2_dbg_acct_sanity_check(c,NULL); |
1da177e4 LT |
187 | } |
188 | ||
189 | return fn; | |
190 | } | |
191 | ||
9fe4854c DW |
192 | struct jffs2_full_dirent *jffs2_write_dirent(struct jffs2_sb_info *c, struct jffs2_inode_info *f, |
193 | struct jffs2_raw_dirent *rd, const unsigned char *name, | |
194 | uint32_t namelen, int alloc_mode) | |
1da177e4 | 195 | { |
1da177e4 LT |
196 | struct jffs2_full_dirent *fd; |
197 | size_t retlen; | |
198 | struct kvec vecs[2]; | |
2f785402 | 199 | uint32_t flash_ofs; |
1da177e4 LT |
200 | int retried = 0; |
201 | int ret; | |
202 | ||
182ec4ee | 203 | D1(printk(KERN_DEBUG "jffs2_write_dirent(ino #%u, name at *0x%p \"%s\"->ino #%u, name_crc 0x%08x)\n", |
1da177e4 LT |
204 | je32_to_cpu(rd->pino), name, name, je32_to_cpu(rd->ino), |
205 | je32_to_cpu(rd->name_crc))); | |
730554d9 | 206 | |
1da177e4 LT |
207 | D1(if(je32_to_cpu(rd->hdr_crc) != crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)) { |
208 | printk(KERN_CRIT "Eep. CRC not correct in jffs2_write_dirent()\n"); | |
209 | BUG(); | |
2f785402 | 210 | }); |
1da177e4 LT |
211 | |
212 | vecs[0].iov_base = rd; | |
213 | vecs[0].iov_len = sizeof(*rd); | |
214 | vecs[1].iov_base = (unsigned char *)name; | |
215 | vecs[1].iov_len = namelen; | |
182ec4ee | 216 | |
1da177e4 | 217 | fd = jffs2_alloc_full_dirent(namelen+1); |
2f785402 | 218 | if (!fd) |
1da177e4 | 219 | return ERR_PTR(-ENOMEM); |
1da177e4 LT |
220 | |
221 | fd->version = je32_to_cpu(rd->version); | |
222 | fd->ino = je32_to_cpu(rd->ino); | |
223 | fd->nhash = full_name_hash(name, strlen(name)); | |
224 | fd->type = rd->type; | |
225 | memcpy(fd->name, name, namelen); | |
226 | fd->name[namelen]=0; | |
227 | ||
228 | retry: | |
2f785402 | 229 | flash_ofs = write_ofs(c); |
1da177e4 | 230 | |
2f785402 | 231 | jffs2_dbg_prewrite_paranoia_check(c, flash_ofs, vecs[0].iov_len + vecs[1].iov_len); |
1da177e4 | 232 | |
9b88f473 EH |
233 | if ((alloc_mode!=ALLOC_GC) && (je32_to_cpu(rd->version) < f->highest_version)) { |
234 | BUG_ON(!retried); | |
235 | D1(printk(KERN_DEBUG "jffs2_write_dirent : dirent_version %d, " | |
236 | "highest version %d -> updating dirent\n", | |
237 | je32_to_cpu(rd->version), f->highest_version)); | |
238 | rd->version = cpu_to_je32(++f->highest_version); | |
239 | fd->version = je32_to_cpu(rd->version); | |
240 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
e4803c30 EH |
241 | } |
242 | ||
1da177e4 LT |
243 | ret = jffs2_flash_writev(c, vecs, 2, flash_ofs, &retlen, |
244 | (alloc_mode==ALLOC_GC)?0:je32_to_cpu(rd->pino)); | |
245 | if (ret || (retlen != sizeof(*rd) + namelen)) { | |
182ec4ee | 246 | printk(KERN_NOTICE "Write of %zd bytes at 0x%08x failed. returned %d, retlen %zd\n", |
1da177e4 LT |
247 | sizeof(*rd)+namelen, flash_ofs, ret, retlen); |
248 | /* Mark the space as dirtied */ | |
249 | if (retlen) { | |
2f785402 | 250 | jffs2_add_physical_node_ref(c, flash_ofs | REF_OBSOLETE, PAD(sizeof(*rd)+namelen), NULL); |
1da177e4 | 251 | } else { |
2f785402 | 252 | printk(KERN_NOTICE "Not marking the space at 0x%08x as dirty because the flash driver returned retlen zero\n", flash_ofs); |
1da177e4 | 253 | } |
2f785402 | 254 | if (!retried) { |
1da177e4 LT |
255 | /* Try to reallocate space and retry */ |
256 | uint32_t dummy; | |
257 | struct jffs2_eraseblock *jeb = &c->blocks[flash_ofs / c->sector_size]; | |
258 | ||
259 | retried = 1; | |
260 | ||
261 | D1(printk(KERN_DEBUG "Retrying failed write.\n")); | |
262 | ||
730554d9 AB |
263 | jffs2_dbg_acct_sanity_check(c,jeb); |
264 | jffs2_dbg_acct_paranoia_check(c, jeb); | |
1da177e4 LT |
265 | |
266 | if (alloc_mode == ALLOC_GC) { | |
9fe4854c DW |
267 | ret = jffs2_reserve_space_gc(c, sizeof(*rd) + namelen, &dummy, |
268 | JFFS2_SUMMARY_DIRENT_SIZE(namelen)); | |
1da177e4 LT |
269 | } else { |
270 | /* Locking pain */ | |
271 | up(&f->sem); | |
272 | jffs2_complete_reservation(c); | |
182ec4ee | 273 | |
9fe4854c DW |
274 | ret = jffs2_reserve_space(c, sizeof(*rd) + namelen, &dummy, |
275 | alloc_mode, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); | |
1da177e4 LT |
276 | down(&f->sem); |
277 | } | |
278 | ||
279 | if (!ret) { | |
9fe4854c | 280 | flash_ofs = write_ofs(c); |
1da177e4 | 281 | D1(printk(KERN_DEBUG "Allocated space at 0x%08x to retry failed write.\n", flash_ofs)); |
730554d9 AB |
282 | jffs2_dbg_acct_sanity_check(c,jeb); |
283 | jffs2_dbg_acct_paranoia_check(c, jeb); | |
1da177e4 LT |
284 | goto retry; |
285 | } | |
286 | D1(printk(KERN_DEBUG "Failed to allocate space to retry failed write: %d!\n", ret)); | |
1da177e4 LT |
287 | } |
288 | /* Release the full_dnode which is now useless, and return */ | |
289 | jffs2_free_full_dirent(fd); | |
290 | return ERR_PTR(ret?ret:-EIO); | |
291 | } | |
292 | /* Mark the space used */ | |
2f785402 | 293 | fd->raw = jffs2_add_physical_node_ref(c, flash_ofs | REF_PRISTINE, PAD(sizeof(*rd)+namelen), f->inocache); |
1da177e4 LT |
294 | |
295 | if (retried) { | |
730554d9 | 296 | jffs2_dbg_acct_sanity_check(c,NULL); |
1da177e4 LT |
297 | } |
298 | ||
299 | return fd; | |
300 | } | |
301 | ||
302 | /* The OS-specific code fills in the metadata in the jffs2_raw_inode for us, so that | |
303 | we don't have to go digging in struct inode or its equivalent. It should set: | |
304 | mode, uid, gid, (starting)isize, atime, ctime, mtime */ | |
305 | int jffs2_write_inode_range(struct jffs2_sb_info *c, struct jffs2_inode_info *f, | |
182ec4ee | 306 | struct jffs2_raw_inode *ri, unsigned char *buf, |
1da177e4 LT |
307 | uint32_t offset, uint32_t writelen, uint32_t *retlen) |
308 | { | |
309 | int ret = 0; | |
310 | uint32_t writtenlen = 0; | |
311 | ||
312 | D1(printk(KERN_DEBUG "jffs2_write_inode_range(): Ino #%u, ofs 0x%x, len 0x%x\n", | |
313 | f->inocache->ino, offset, writelen)); | |
182ec4ee | 314 | |
1da177e4 LT |
315 | while(writelen) { |
316 | struct jffs2_full_dnode *fn; | |
317 | unsigned char *comprbuf = NULL; | |
318 | uint16_t comprtype = JFFS2_COMPR_NONE; | |
9fe4854c | 319 | uint32_t alloclen; |
1da177e4 LT |
320 | uint32_t datalen, cdatalen; |
321 | int retried = 0; | |
322 | ||
323 | retry: | |
324 | D2(printk(KERN_DEBUG "jffs2_commit_write() loop: 0x%x to write to 0x%x\n", writelen, offset)); | |
325 | ||
9fe4854c | 326 | ret = jffs2_reserve_space(c, sizeof(*ri) + JFFS2_MIN_DATA_LEN, |
e631ddba | 327 | &alloclen, ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE); |
1da177e4 LT |
328 | if (ret) { |
329 | D1(printk(KERN_DEBUG "jffs2_reserve_space returned %d\n", ret)); | |
330 | break; | |
331 | } | |
332 | down(&f->sem); | |
333 | datalen = min_t(uint32_t, writelen, PAGE_CACHE_SIZE - (offset & (PAGE_CACHE_SIZE-1))); | |
334 | cdatalen = min_t(uint32_t, alloclen - sizeof(*ri), datalen); | |
335 | ||
336 | comprtype = jffs2_compress(c, f, buf, &comprbuf, &datalen, &cdatalen); | |
337 | ||
338 | ri->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
339 | ri->nodetype = cpu_to_je16(JFFS2_NODETYPE_INODE); | |
340 | ri->totlen = cpu_to_je32(sizeof(*ri) + cdatalen); | |
341 | ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4)); | |
342 | ||
343 | ri->ino = cpu_to_je32(f->inocache->ino); | |
344 | ri->version = cpu_to_je32(++f->highest_version); | |
345 | ri->isize = cpu_to_je32(max(je32_to_cpu(ri->isize), offset + datalen)); | |
346 | ri->offset = cpu_to_je32(offset); | |
347 | ri->csize = cpu_to_je32(cdatalen); | |
348 | ri->dsize = cpu_to_je32(datalen); | |
349 | ri->compr = comprtype & 0xff; | |
350 | ri->usercompr = (comprtype >> 8 ) & 0xff; | |
351 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); | |
352 | ri->data_crc = cpu_to_je32(crc32(0, comprbuf, cdatalen)); | |
353 | ||
9fe4854c | 354 | fn = jffs2_write_dnode(c, f, ri, comprbuf, cdatalen, ALLOC_NORETRY); |
1da177e4 LT |
355 | |
356 | jffs2_free_comprbuf(comprbuf, buf); | |
357 | ||
358 | if (IS_ERR(fn)) { | |
359 | ret = PTR_ERR(fn); | |
360 | up(&f->sem); | |
361 | jffs2_complete_reservation(c); | |
362 | if (!retried) { | |
363 | /* Write error to be retried */ | |
364 | retried = 1; | |
365 | D1(printk(KERN_DEBUG "Retrying node write in jffs2_write_inode_range()\n")); | |
366 | goto retry; | |
367 | } | |
368 | break; | |
369 | } | |
370 | ret = jffs2_add_full_dnode_to_inode(c, f, fn); | |
371 | if (f->metadata) { | |
372 | jffs2_mark_node_obsolete(c, f->metadata->raw); | |
373 | jffs2_free_full_dnode(f->metadata); | |
374 | f->metadata = NULL; | |
375 | } | |
376 | if (ret) { | |
377 | /* Eep */ | |
378 | D1(printk(KERN_DEBUG "Eep. add_full_dnode_to_inode() failed in commit_write, returned %d\n", ret)); | |
379 | jffs2_mark_node_obsolete(c, fn->raw); | |
380 | jffs2_free_full_dnode(fn); | |
381 | ||
382 | up(&f->sem); | |
383 | jffs2_complete_reservation(c); | |
384 | break; | |
385 | } | |
386 | up(&f->sem); | |
387 | jffs2_complete_reservation(c); | |
388 | if (!datalen) { | |
389 | printk(KERN_WARNING "Eep. We didn't actually write any data in jffs2_write_inode_range()\n"); | |
390 | ret = -EIO; | |
391 | break; | |
392 | } | |
393 | D1(printk(KERN_DEBUG "increasing writtenlen by %d\n", datalen)); | |
394 | writtenlen += datalen; | |
395 | offset += datalen; | |
396 | writelen -= datalen; | |
397 | buf += datalen; | |
398 | } | |
399 | *retlen = writtenlen; | |
400 | return ret; | |
401 | } | |
402 | ||
403 | 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) | |
404 | { | |
405 | struct jffs2_raw_dirent *rd; | |
406 | struct jffs2_full_dnode *fn; | |
407 | struct jffs2_full_dirent *fd; | |
9fe4854c | 408 | uint32_t alloclen; |
1da177e4 LT |
409 | int ret; |
410 | ||
182ec4ee TG |
411 | /* Try to reserve enough space for both node and dirent. |
412 | * Just the node will do for now, though | |
1da177e4 | 413 | */ |
9fe4854c | 414 | ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL, |
e631ddba | 415 | JFFS2_SUMMARY_INODE_SIZE); |
1da177e4 LT |
416 | D1(printk(KERN_DEBUG "jffs2_do_create(): reserved 0x%x bytes\n", alloclen)); |
417 | if (ret) { | |
418 | up(&f->sem); | |
419 | return ret; | |
420 | } | |
421 | ||
422 | ri->data_crc = cpu_to_je32(0); | |
423 | ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8)); | |
424 | ||
9fe4854c | 425 | fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL); |
1da177e4 LT |
426 | |
427 | D1(printk(KERN_DEBUG "jffs2_do_create created file with mode 0x%x\n", | |
428 | jemode_to_cpu(ri->mode))); | |
429 | ||
430 | if (IS_ERR(fn)) { | |
431 | D1(printk(KERN_DEBUG "jffs2_write_dnode() failed\n")); | |
432 | /* Eeek. Wave bye bye */ | |
433 | up(&f->sem); | |
434 | jffs2_complete_reservation(c); | |
435 | return PTR_ERR(fn); | |
436 | } | |
182ec4ee | 437 | /* No data here. Only a metadata node, which will be |
1da177e4 LT |
438 | obsoleted by the first data write |
439 | */ | |
440 | f->metadata = fn; | |
441 | ||
442 | up(&f->sem); | |
443 | jffs2_complete_reservation(c); | |
9fe4854c | 444 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
e631ddba | 445 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); |
182ec4ee | 446 | |
1da177e4 LT |
447 | if (ret) { |
448 | /* Eep. */ | |
449 | D1(printk(KERN_DEBUG "jffs2_reserve_space() for dirent failed\n")); | |
450 | return ret; | |
451 | } | |
452 | ||
453 | rd = jffs2_alloc_raw_dirent(); | |
454 | if (!rd) { | |
455 | /* Argh. Now we treat it like a normal delete */ | |
456 | jffs2_complete_reservation(c); | |
457 | return -ENOMEM; | |
458 | } | |
459 | ||
460 | down(&dir_f->sem); | |
461 | ||
462 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
463 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
464 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
465 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
466 | ||
467 | rd->pino = cpu_to_je32(dir_f->inocache->ino); | |
468 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
469 | rd->ino = ri->ino; | |
470 | rd->mctime = ri->ctime; | |
471 | rd->nsize = namelen; | |
472 | rd->type = DT_REG; | |
473 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
474 | rd->name_crc = cpu_to_je32(crc32(0, name, namelen)); | |
475 | ||
9fe4854c | 476 | fd = jffs2_write_dirent(c, dir_f, rd, name, namelen, ALLOC_NORMAL); |
1da177e4 LT |
477 | |
478 | jffs2_free_raw_dirent(rd); | |
182ec4ee | 479 | |
1da177e4 | 480 | if (IS_ERR(fd)) { |
182ec4ee | 481 | /* dirent failed to write. Delete the inode normally |
1da177e4 LT |
482 | as if it were the final unlink() */ |
483 | jffs2_complete_reservation(c); | |
484 | up(&dir_f->sem); | |
485 | return PTR_ERR(fd); | |
486 | } | |
487 | ||
488 | /* Link the fd into the inode's list, obsoleting an old | |
489 | one if necessary. */ | |
490 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
491 | ||
492 | jffs2_complete_reservation(c); | |
493 | up(&dir_f->sem); | |
494 | ||
495 | return 0; | |
496 | } | |
497 | ||
498 | ||
499 | int jffs2_do_unlink(struct jffs2_sb_info *c, struct jffs2_inode_info *dir_f, | |
3a69e0cd AB |
500 | const char *name, int namelen, struct jffs2_inode_info *dead_f, |
501 | uint32_t time) | |
1da177e4 LT |
502 | { |
503 | struct jffs2_raw_dirent *rd; | |
504 | struct jffs2_full_dirent *fd; | |
9fe4854c | 505 | uint32_t alloclen; |
1da177e4 LT |
506 | int ret; |
507 | ||
a491486a | 508 | if (!jffs2_can_mark_obsolete(c)) { |
1da177e4 LT |
509 | /* We can't mark stuff obsolete on the medium. We need to write a deletion dirent */ |
510 | ||
511 | rd = jffs2_alloc_raw_dirent(); | |
512 | if (!rd) | |
513 | return -ENOMEM; | |
514 | ||
9fe4854c | 515 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
e631ddba | 516 | ALLOC_DELETION, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); |
1da177e4 LT |
517 | if (ret) { |
518 | jffs2_free_raw_dirent(rd); | |
519 | return ret; | |
520 | } | |
521 | ||
522 | down(&dir_f->sem); | |
523 | ||
524 | /* Build a deletion node */ | |
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)); | |
182ec4ee | 529 | |
1da177e4 LT |
530 | rd->pino = cpu_to_je32(dir_f->inocache->ino); |
531 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
532 | rd->ino = cpu_to_je32(0); | |
3a69e0cd | 533 | rd->mctime = cpu_to_je32(time); |
1da177e4 LT |
534 | rd->nsize = namelen; |
535 | rd->type = DT_UNKNOWN; | |
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 | ||
9fe4854c | 539 | fd = jffs2_write_dirent(c, dir_f, rd, name, namelen, ALLOC_DELETION); |
182ec4ee | 540 | |
1da177e4 LT |
541 | jffs2_free_raw_dirent(rd); |
542 | ||
543 | if (IS_ERR(fd)) { | |
544 | jffs2_complete_reservation(c); | |
545 | up(&dir_f->sem); | |
546 | return PTR_ERR(fd); | |
547 | } | |
548 | ||
549 | /* File it. This will mark the old one obsolete. */ | |
550 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
551 | up(&dir_f->sem); | |
552 | } else { | |
553 | struct jffs2_full_dirent **prev = &dir_f->dents; | |
554 | uint32_t nhash = full_name_hash(name, namelen); | |
555 | ||
556 | down(&dir_f->sem); | |
557 | ||
558 | while ((*prev) && (*prev)->nhash <= nhash) { | |
182ec4ee | 559 | if ((*prev)->nhash == nhash && |
1da177e4 LT |
560 | !memcmp((*prev)->name, name, namelen) && |
561 | !(*prev)->name[namelen]) { | |
562 | struct jffs2_full_dirent *this = *prev; | |
563 | ||
564 | D1(printk(KERN_DEBUG "Marking old dirent node (ino #%u) @%08x obsolete\n", | |
565 | this->ino, ref_offset(this->raw))); | |
566 | ||
567 | *prev = this->next; | |
568 | jffs2_mark_node_obsolete(c, (this->raw)); | |
569 | jffs2_free_full_dirent(this); | |
570 | break; | |
571 | } | |
572 | prev = &((*prev)->next); | |
573 | } | |
574 | up(&dir_f->sem); | |
575 | } | |
576 | ||
577 | /* dead_f is NULL if this was a rename not a real unlink */ | |
578 | /* Also catch the !f->inocache case, where there was a dirent | |
579 | pointing to an inode which didn't exist. */ | |
182ec4ee | 580 | if (dead_f && dead_f->inocache) { |
1da177e4 LT |
581 | |
582 | down(&dead_f->sem); | |
583 | ||
32f1a95d AB |
584 | if (S_ISDIR(OFNI_EDONI_2SFFJ(dead_f)->i_mode)) { |
585 | while (dead_f->dents) { | |
586 | /* There can be only deleted ones */ | |
587 | fd = dead_f->dents; | |
182ec4ee | 588 | |
32f1a95d | 589 | dead_f->dents = fd->next; |
182ec4ee | 590 | |
32f1a95d AB |
591 | if (fd->ino) { |
592 | printk(KERN_WARNING "Deleting inode #%u with active dentry \"%s\"->ino #%u\n", | |
593 | dead_f->inocache->ino, fd->name, fd->ino); | |
594 | } else { | |
595 | D1(printk(KERN_DEBUG "Removing deletion dirent for \"%s\" from dir ino #%u\n", | |
596 | fd->name, dead_f->inocache->ino)); | |
597 | } | |
598 | jffs2_mark_node_obsolete(c, fd->raw); | |
599 | jffs2_free_full_dirent(fd); | |
1da177e4 | 600 | } |
1da177e4 LT |
601 | } |
602 | ||
603 | dead_f->inocache->nlink--; | |
604 | /* NB: Caller must set inode nlink if appropriate */ | |
605 | up(&dead_f->sem); | |
606 | } | |
607 | ||
608 | jffs2_complete_reservation(c); | |
609 | ||
610 | return 0; | |
611 | } | |
612 | ||
613 | ||
3a69e0cd | 614 | 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 |
615 | { |
616 | struct jffs2_raw_dirent *rd; | |
617 | struct jffs2_full_dirent *fd; | |
9fe4854c | 618 | uint32_t alloclen; |
1da177e4 LT |
619 | int ret; |
620 | ||
621 | rd = jffs2_alloc_raw_dirent(); | |
622 | if (!rd) | |
623 | return -ENOMEM; | |
624 | ||
9fe4854c | 625 | ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen, |
e631ddba | 626 | ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen)); |
1da177e4 LT |
627 | if (ret) { |
628 | jffs2_free_raw_dirent(rd); | |
629 | return ret; | |
630 | } | |
182ec4ee | 631 | |
1da177e4 LT |
632 | down(&dir_f->sem); |
633 | ||
634 | /* Build a deletion node */ | |
635 | rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK); | |
636 | rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT); | |
637 | rd->totlen = cpu_to_je32(sizeof(*rd) + namelen); | |
638 | rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4)); | |
639 | ||
640 | rd->pino = cpu_to_je32(dir_f->inocache->ino); | |
641 | rd->version = cpu_to_je32(++dir_f->highest_version); | |
642 | rd->ino = cpu_to_je32(ino); | |
3a69e0cd | 643 | rd->mctime = cpu_to_je32(time); |
1da177e4 LT |
644 | rd->nsize = namelen; |
645 | ||
646 | rd->type = type; | |
647 | ||
648 | rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8)); | |
649 | rd->name_crc = cpu_to_je32(crc32(0, name, namelen)); | |
650 | ||
9fe4854c | 651 | fd = jffs2_write_dirent(c, dir_f, rd, name, namelen, ALLOC_NORMAL); |
182ec4ee | 652 | |
1da177e4 LT |
653 | jffs2_free_raw_dirent(rd); |
654 | ||
655 | if (IS_ERR(fd)) { | |
656 | jffs2_complete_reservation(c); | |
657 | up(&dir_f->sem); | |
658 | return PTR_ERR(fd); | |
659 | } | |
660 | ||
661 | /* File it. This will mark the old one obsolete. */ | |
662 | jffs2_add_fd_to_list(c, fd, &dir_f->dents); | |
663 | ||
664 | jffs2_complete_reservation(c); | |
665 | up(&dir_f->sem); | |
666 | ||
667 | return 0; | |
668 | } |