blob: a7bf9cb2567fc20b763354d5abd4a8e197c63373 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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 *
Thomas Gleixner182ec4e2005-11-07 11:16:07 +000010 * $Id: dir.c,v 1.90 2005/11/07 11:14:39 gleixner Exp $
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 *
12 */
13
14#include <linux/kernel.h>
15#include <linux/slab.h>
16#include <linux/sched.h>
17#include <linux/fs.h>
18#include <linux/crc32.h>
19#include <linux/jffs2.h>
20#include <linux/jffs2_fs_i.h>
21#include <linux/jffs2_fs_sb.h>
22#include <linux/time.h>
23#include "nodelist.h"
24
Linus Torvalds1da177e2005-04-16 15:20:36 -070025static int jffs2_readdir (struct file *, void *, filldir_t);
26
27static int jffs2_create (struct inode *,struct dentry *,int,
28 struct nameidata *);
29static struct dentry *jffs2_lookup (struct inode *,struct dentry *,
30 struct nameidata *);
31static int jffs2_link (struct dentry *,struct inode *,struct dentry *);
32static int jffs2_unlink (struct inode *,struct dentry *);
33static int jffs2_symlink (struct inode *,struct dentry *,const char *);
34static int jffs2_mkdir (struct inode *,struct dentry *,int);
35static int jffs2_rmdir (struct inode *,struct dentry *);
David Woodhouse265489f2005-07-06 13:13:13 +010036static int jffs2_mknod (struct inode *,struct dentry *,int,dev_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -070037static int jffs2_rename (struct inode *, struct dentry *,
38 struct inode *, struct dentry *);
39
40struct file_operations jffs2_dir_operations =
41{
42 .read = generic_read_dir,
43 .readdir = jffs2_readdir,
44 .ioctl = jffs2_ioctl,
45 .fsync = jffs2_fsync
46};
47
48
49struct inode_operations jffs2_dir_inode_operations =
50{
David Woodhouse265489f2005-07-06 13:13:13 +010051 .create = jffs2_create,
52 .lookup = jffs2_lookup,
Linus Torvalds1da177e2005-04-16 15:20:36 -070053 .link = jffs2_link,
54 .unlink = jffs2_unlink,
55 .symlink = jffs2_symlink,
56 .mkdir = jffs2_mkdir,
57 .rmdir = jffs2_rmdir,
58 .mknod = jffs2_mknod,
59 .rename = jffs2_rename,
60 .setattr = jffs2_setattr,
61};
62
63/***********************************************************************/
64
65
66/* We keep the dirent list sorted in increasing order of name hash,
Thomas Gleixner182ec4e2005-11-07 11:16:07 +000067 and we use the same hash function as the dentries. Makes this
Linus Torvalds1da177e2005-04-16 15:20:36 -070068 nice and simple
69*/
70static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target,
71 struct nameidata *nd)
72{
73 struct jffs2_inode_info *dir_f;
74 struct jffs2_sb_info *c;
75 struct jffs2_full_dirent *fd = NULL, *fd_list;
76 uint32_t ino = 0;
77 struct inode *inode = NULL;
78
79 D1(printk(KERN_DEBUG "jffs2_lookup()\n"));
80
81 dir_f = JFFS2_INODE_INFO(dir_i);
82 c = JFFS2_SB_INFO(dir_i->i_sb);
83
84 down(&dir_f->sem);
85
86 /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */
87 for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= target->d_name.hash; fd_list = fd_list->next) {
Thomas Gleixner182ec4e2005-11-07 11:16:07 +000088 if (fd_list->nhash == target->d_name.hash &&
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 (!fd || fd_list->version > fd->version) &&
90 strlen(fd_list->name) == target->d_name.len &&
91 !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) {
92 fd = fd_list;
93 }
94 }
95 if (fd)
96 ino = fd->ino;
97 up(&dir_f->sem);
98 if (ino) {
99 inode = iget(dir_i->i_sb, ino);
100 if (!inode) {
101 printk(KERN_WARNING "iget() failed for ino #%u\n", ino);
102 return (ERR_PTR(-EIO));
103 }
104 }
105
106 d_add(target, inode);
107
108 return NULL;
109}
110
111/***********************************************************************/
112
113
114static int jffs2_readdir(struct file *filp, void *dirent, filldir_t filldir)
115{
116 struct jffs2_inode_info *f;
117 struct jffs2_sb_info *c;
118 struct inode *inode = filp->f_dentry->d_inode;
119 struct jffs2_full_dirent *fd;
120 unsigned long offset, curofs;
121
122 D1(printk(KERN_DEBUG "jffs2_readdir() for dir_i #%lu\n", filp->f_dentry->d_inode->i_ino));
123
124 f = JFFS2_INODE_INFO(inode);
125 c = JFFS2_SB_INFO(inode->i_sb);
126
127 offset = filp->f_pos;
128
129 if (offset == 0) {
130 D1(printk(KERN_DEBUG "Dirent 0: \".\", ino #%lu\n", inode->i_ino));
131 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
132 goto out;
133 offset++;
134 }
135 if (offset == 1) {
136 unsigned long pino = parent_ino(filp->f_dentry);
137 D1(printk(KERN_DEBUG "Dirent 1: \"..\", ino #%lu\n", pino));
138 if (filldir(dirent, "..", 2, 1, pino, DT_DIR) < 0)
139 goto out;
140 offset++;
141 }
142
143 curofs=1;
144 down(&f->sem);
145 for (fd = f->dents; fd; fd = fd->next) {
146
147 curofs++;
148 /* First loop: curofs = 2; offset = 2 */
149 if (curofs < offset) {
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000150 D2(printk(KERN_DEBUG "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151 fd->name, fd->ino, fd->type, curofs, offset));
152 continue;
153 }
154 if (!fd->ino) {
155 D2(printk(KERN_DEBUG "Skipping deletion dirent \"%s\"\n", fd->name));
156 offset++;
157 continue;
158 }
159 D2(printk(KERN_DEBUG "Dirent %ld: \"%s\", ino #%u, type %d\n", offset, fd->name, fd->ino, fd->type));
160 if (filldir(dirent, fd->name, strlen(fd->name), offset, fd->ino, fd->type) < 0)
161 break;
162 offset++;
163 }
164 up(&f->sem);
165 out:
166 filp->f_pos = offset;
167 return 0;
168}
169
170/***********************************************************************/
171
172
173static int jffs2_create(struct inode *dir_i, struct dentry *dentry, int mode,
174 struct nameidata *nd)
175{
176 struct jffs2_raw_inode *ri;
177 struct jffs2_inode_info *f, *dir_f;
178 struct jffs2_sb_info *c;
179 struct inode *inode;
180 int ret;
181
182 ri = jffs2_alloc_raw_inode();
183 if (!ri)
184 return -ENOMEM;
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000185
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186 c = JFFS2_SB_INFO(dir_i->i_sb);
187
188 D1(printk(KERN_DEBUG "jffs2_create()\n"));
189
190 inode = jffs2_new_inode(dir_i, mode, ri);
191
192 if (IS_ERR(inode)) {
193 D1(printk(KERN_DEBUG "jffs2_new_inode() failed\n"));
194 jffs2_free_raw_inode(ri);
195 return PTR_ERR(inode);
196 }
197
198 inode->i_op = &jffs2_file_inode_operations;
199 inode->i_fop = &jffs2_file_operations;
200 inode->i_mapping->a_ops = &jffs2_file_address_operations;
201 inode->i_mapping->nrpages = 0;
202
203 f = JFFS2_INODE_INFO(inode);
204 dir_f = JFFS2_INODE_INFO(dir_i);
205
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000206 ret = jffs2_do_create(c, dir_f, f, ri,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207 dentry->d_name.name, dentry->d_name.len);
208
209 if (ret) {
210 make_bad_inode(inode);
211 iput(inode);
212 jffs2_free_raw_inode(ri);
213 return ret;
214 }
215
216 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime));
217
218 jffs2_free_raw_inode(ri);
219 d_instantiate(dentry, inode);
220
221 D1(printk(KERN_DEBUG "jffs2_create: Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n",
222 inode->i_ino, inode->i_mode, inode->i_nlink, f->inocache->nlink, inode->i_mapping->nrpages));
223 return 0;
224}
225
226/***********************************************************************/
227
228
229static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry)
230{
231 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
232 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
233 struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode);
234 int ret;
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100235 uint32_t now = get_seconds();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000237 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100238 dentry->d_name.len, dead_f, now);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239 if (dead_f->inocache)
240 dentry->d_inode->i_nlink = dead_f->inocache->nlink;
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100241 if (!ret)
242 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 return ret;
244}
245/***********************************************************************/
246
247
248static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
249{
250 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb);
251 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
252 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
253 int ret;
254 uint8_t type;
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100255 uint32_t now;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700256
257 /* Don't let people make hard links to bad inodes. */
258 if (!f->inocache)
259 return -EIO;
260
261 if (S_ISDIR(old_dentry->d_inode->i_mode))
262 return -EPERM;
263
264 /* XXX: This is ugly */
265 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
266 if (!type) type = DT_REG;
267
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100268 now = get_seconds();
269 ret = jffs2_do_link(c, dir_f, f->inocache->ino, type, dentry->d_name.name, dentry->d_name.len, now);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270
271 if (!ret) {
272 down(&f->sem);
273 old_dentry->d_inode->i_nlink = ++f->inocache->nlink;
274 up(&f->sem);
275 d_instantiate(dentry, old_dentry->d_inode);
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100276 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 atomic_inc(&old_dentry->d_inode->i_count);
278 }
279 return ret;
280}
281
282/***********************************************************************/
283
284static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target)
285{
286 struct jffs2_inode_info *f, *dir_f;
287 struct jffs2_sb_info *c;
288 struct inode *inode;
289 struct jffs2_raw_inode *ri;
290 struct jffs2_raw_dirent *rd;
291 struct jffs2_full_dnode *fn;
292 struct jffs2_full_dirent *fd;
293 int namelen;
294 uint32_t alloclen, phys_ofs;
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000295 int ret, targetlen = strlen(target);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296
297 /* FIXME: If you care. We'd need to use frags for the target
298 if it grows much more than this */
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000299 if (targetlen > 254)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 return -EINVAL;
301
302 ri = jffs2_alloc_raw_inode();
303
304 if (!ri)
305 return -ENOMEM;
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000306
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 c = JFFS2_SB_INFO(dir_i->i_sb);
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000308
309 /* Try to reserve enough space for both node and dirent.
310 * Just the node will do for now, though
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 */
312 namelen = dentry->d_name.len;
Ferenc Havasie631ddb2005-09-07 09:35:26 +0100313 ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &phys_ofs, &alloclen,
314 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315
316 if (ret) {
317 jffs2_free_raw_inode(ri);
318 return ret;
319 }
320
321 inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri);
322
323 if (IS_ERR(inode)) {
324 jffs2_free_raw_inode(ri);
325 jffs2_complete_reservation(c);
326 return PTR_ERR(inode);
327 }
328
329 inode->i_op = &jffs2_symlink_inode_operations;
330
331 f = JFFS2_INODE_INFO(inode);
332
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000333 inode->i_size = targetlen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size);
335 ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size);
336 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
337
338 ri->compr = JFFS2_COMPR_NONE;
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000339 ri->data_crc = cpu_to_je32(crc32(0, target, targetlen));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000341
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000342 fn = jffs2_write_dnode(c, f, ri, target, targetlen, phys_ofs, ALLOC_NORMAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343
344 jffs2_free_raw_inode(ri);
345
346 if (IS_ERR(fn)) {
347 /* Eeek. Wave bye bye */
348 up(&f->sem);
349 jffs2_complete_reservation(c);
350 jffs2_clear_inode(inode);
351 return PTR_ERR(fn);
352 }
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000353
Artem B. Bityutskiy2b79adc2005-07-17 12:13:51 +0100354 /* We use f->target field to store the target path. */
355 f->target = kmalloc(targetlen + 1, GFP_KERNEL);
356 if (!f->target) {
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000357 printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1);
358 up(&f->sem);
359 jffs2_complete_reservation(c);
360 jffs2_clear_inode(inode);
361 return -ENOMEM;
362 }
363
Artem B. Bityutskiy2b79adc2005-07-17 12:13:51 +0100364 memcpy(f->target, target, targetlen + 1);
365 D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->target));
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000366
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000367 /* No data here. Only a metadata node, which will be
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 obsoleted by the first data write
369 */
370 f->metadata = fn;
371 up(&f->sem);
372
373 jffs2_complete_reservation(c);
Ferenc Havasie631ddb2005-09-07 09:35:26 +0100374 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen,
375 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 if (ret) {
377 /* Eep. */
378 jffs2_clear_inode(inode);
379 return ret;
380 }
381
382 rd = jffs2_alloc_raw_dirent();
383 if (!rd) {
384 /* Argh. Now we treat it like a normal delete */
385 jffs2_complete_reservation(c);
386 jffs2_clear_inode(inode);
387 return -ENOMEM;
388 }
389
390 dir_f = JFFS2_INODE_INFO(dir_i);
391 down(&dir_f->sem);
392
393 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
394 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
395 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
396 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
397
398 rd->pino = cpu_to_je32(dir_i->i_ino);
399 rd->version = cpu_to_je32(++dir_f->highest_version);
400 rd->ino = cpu_to_je32(inode->i_ino);
401 rd->mctime = cpu_to_je32(get_seconds());
402 rd->nsize = namelen;
403 rd->type = DT_LNK;
404 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
405 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
406
407 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL);
408
409 if (IS_ERR(fd)) {
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000410 /* dirent failed to write. Delete the inode normally
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 as if it were the final unlink() */
412 jffs2_complete_reservation(c);
413 jffs2_free_raw_dirent(rd);
414 up(&dir_f->sem);
415 jffs2_clear_inode(inode);
416 return PTR_ERR(fd);
417 }
418
419 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
420
421 jffs2_free_raw_dirent(rd);
422
423 /* Link the fd into the inode's list, obsoleting an old
424 one if necessary. */
425 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
426
427 up(&dir_f->sem);
428 jffs2_complete_reservation(c);
429
430 d_instantiate(dentry, inode);
431 return 0;
432}
433
434
435static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode)
436{
437 struct jffs2_inode_info *f, *dir_f;
438 struct jffs2_sb_info *c;
439 struct inode *inode;
440 struct jffs2_raw_inode *ri;
441 struct jffs2_raw_dirent *rd;
442 struct jffs2_full_dnode *fn;
443 struct jffs2_full_dirent *fd;
444 int namelen;
445 uint32_t alloclen, phys_ofs;
446 int ret;
447
448 mode |= S_IFDIR;
449
450 ri = jffs2_alloc_raw_inode();
451 if (!ri)
452 return -ENOMEM;
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000453
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 c = JFFS2_SB_INFO(dir_i->i_sb);
455
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000456 /* Try to reserve enough space for both node and dirent.
457 * Just the node will do for now, though
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 */
459 namelen = dentry->d_name.len;
Ferenc Havasie631ddb2005-09-07 09:35:26 +0100460 ret = jffs2_reserve_space(c, sizeof(*ri), &phys_ofs, &alloclen, ALLOC_NORMAL,
461 JFFS2_SUMMARY_INODE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700462
463 if (ret) {
464 jffs2_free_raw_inode(ri);
465 return ret;
466 }
467
468 inode = jffs2_new_inode(dir_i, mode, ri);
469
470 if (IS_ERR(inode)) {
471 jffs2_free_raw_inode(ri);
472 jffs2_complete_reservation(c);
473 return PTR_ERR(inode);
474 }
475
476 inode->i_op = &jffs2_dir_inode_operations;
477 inode->i_fop = &jffs2_dir_operations;
478 /* Directories get nlink 2 at start */
479 inode->i_nlink = 2;
480
481 f = JFFS2_INODE_INFO(inode);
482
483 ri->data_crc = cpu_to_je32(0);
484 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000485
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486 fn = jffs2_write_dnode(c, f, ri, NULL, 0, phys_ofs, ALLOC_NORMAL);
487
488 jffs2_free_raw_inode(ri);
489
490 if (IS_ERR(fn)) {
491 /* Eeek. Wave bye bye */
492 up(&f->sem);
493 jffs2_complete_reservation(c);
494 jffs2_clear_inode(inode);
495 return PTR_ERR(fn);
496 }
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000497 /* No data here. Only a metadata node, which will be
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498 obsoleted by the first data write
499 */
500 f->metadata = fn;
501 up(&f->sem);
502
503 jffs2_complete_reservation(c);
Ferenc Havasie631ddb2005-09-07 09:35:26 +0100504 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen,
505 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 if (ret) {
507 /* Eep. */
508 jffs2_clear_inode(inode);
509 return ret;
510 }
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000511
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512 rd = jffs2_alloc_raw_dirent();
513 if (!rd) {
514 /* Argh. Now we treat it like a normal delete */
515 jffs2_complete_reservation(c);
516 jffs2_clear_inode(inode);
517 return -ENOMEM;
518 }
519
520 dir_f = JFFS2_INODE_INFO(dir_i);
521 down(&dir_f->sem);
522
523 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
524 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
525 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
526 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
527
528 rd->pino = cpu_to_je32(dir_i->i_ino);
529 rd->version = cpu_to_je32(++dir_f->highest_version);
530 rd->ino = cpu_to_je32(inode->i_ino);
531 rd->mctime = cpu_to_je32(get_seconds());
532 rd->nsize = namelen;
533 rd->type = DT_DIR;
534 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
535 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
536
537 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL);
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000538
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 if (IS_ERR(fd)) {
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000540 /* dirent failed to write. Delete the inode normally
Linus Torvalds1da177e2005-04-16 15:20:36 -0700541 as if it were the final unlink() */
542 jffs2_complete_reservation(c);
543 jffs2_free_raw_dirent(rd);
544 up(&dir_f->sem);
545 jffs2_clear_inode(inode);
546 return PTR_ERR(fd);
547 }
548
549 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
550 dir_i->i_nlink++;
551
552 jffs2_free_raw_dirent(rd);
553
554 /* Link the fd into the inode's list, obsoleting an old
555 one if necessary. */
556 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
557
558 up(&dir_f->sem);
559 jffs2_complete_reservation(c);
560
561 d_instantiate(dentry, inode);
562 return 0;
563}
564
565static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry)
566{
567 struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode);
568 struct jffs2_full_dirent *fd;
569 int ret;
570
571 for (fd = f->dents ; fd; fd = fd->next) {
572 if (fd->ino)
573 return -ENOTEMPTY;
574 }
575 ret = jffs2_unlink(dir_i, dentry);
576 if (!ret)
577 dir_i->i_nlink--;
578 return ret;
579}
580
David Woodhouse265489f2005-07-06 13:13:13 +0100581static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, dev_t rdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582{
583 struct jffs2_inode_info *f, *dir_f;
584 struct jffs2_sb_info *c;
585 struct inode *inode;
586 struct jffs2_raw_inode *ri;
587 struct jffs2_raw_dirent *rd;
588 struct jffs2_full_dnode *fn;
589 struct jffs2_full_dirent *fd;
590 int namelen;
591 jint16_t dev;
592 int devlen = 0;
593 uint32_t alloclen, phys_ofs;
594 int ret;
595
596 if (!old_valid_dev(rdev))
597 return -EINVAL;
598
599 ri = jffs2_alloc_raw_inode();
600 if (!ri)
601 return -ENOMEM;
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000602
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 c = JFFS2_SB_INFO(dir_i->i_sb);
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000604
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605 if (S_ISBLK(mode) || S_ISCHR(mode)) {
606 dev = cpu_to_je16(old_encode_dev(rdev));
607 devlen = sizeof(dev);
608 }
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000609
610 /* Try to reserve enough space for both node and dirent.
611 * Just the node will do for now, though
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612 */
613 namelen = dentry->d_name.len;
Ferenc Havasie631ddb2005-09-07 09:35:26 +0100614 ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &phys_ofs, &alloclen,
615 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700616
617 if (ret) {
618 jffs2_free_raw_inode(ri);
619 return ret;
620 }
621
622 inode = jffs2_new_inode(dir_i, mode, ri);
623
624 if (IS_ERR(inode)) {
625 jffs2_free_raw_inode(ri);
626 jffs2_complete_reservation(c);
627 return PTR_ERR(inode);
628 }
629 inode->i_op = &jffs2_file_inode_operations;
630 init_special_inode(inode, inode->i_mode, rdev);
631
632 f = JFFS2_INODE_INFO(inode);
633
634 ri->dsize = ri->csize = cpu_to_je32(devlen);
635 ri->totlen = cpu_to_je32(sizeof(*ri) + devlen);
636 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
637
638 ri->compr = JFFS2_COMPR_NONE;
639 ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen));
640 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000641
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642 fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, phys_ofs, ALLOC_NORMAL);
643
644 jffs2_free_raw_inode(ri);
645
646 if (IS_ERR(fn)) {
647 /* Eeek. Wave bye bye */
648 up(&f->sem);
649 jffs2_complete_reservation(c);
650 jffs2_clear_inode(inode);
651 return PTR_ERR(fn);
652 }
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000653 /* No data here. Only a metadata node, which will be
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654 obsoleted by the first data write
655 */
656 f->metadata = fn;
657 up(&f->sem);
658
659 jffs2_complete_reservation(c);
Ferenc Havasie631ddb2005-09-07 09:35:26 +0100660 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &phys_ofs, &alloclen,
661 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662 if (ret) {
663 /* Eep. */
664 jffs2_clear_inode(inode);
665 return ret;
666 }
667
668 rd = jffs2_alloc_raw_dirent();
669 if (!rd) {
670 /* Argh. Now we treat it like a normal delete */
671 jffs2_complete_reservation(c);
672 jffs2_clear_inode(inode);
673 return -ENOMEM;
674 }
675
676 dir_f = JFFS2_INODE_INFO(dir_i);
677 down(&dir_f->sem);
678
679 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
680 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
681 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
682 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
683
684 rd->pino = cpu_to_je32(dir_i->i_ino);
685 rd->version = cpu_to_je32(++dir_f->highest_version);
686 rd->ino = cpu_to_je32(inode->i_ino);
687 rd->mctime = cpu_to_je32(get_seconds());
688 rd->nsize = namelen;
689
690 /* XXX: This is ugly. */
691 rd->type = (mode & S_IFMT) >> 12;
692
693 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
694 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
695
696 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, phys_ofs, ALLOC_NORMAL);
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000697
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698 if (IS_ERR(fd)) {
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000699 /* dirent failed to write. Delete the inode normally
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700 as if it were the final unlink() */
701 jffs2_complete_reservation(c);
702 jffs2_free_raw_dirent(rd);
703 up(&dir_f->sem);
704 jffs2_clear_inode(inode);
705 return PTR_ERR(fd);
706 }
707
708 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
709
710 jffs2_free_raw_dirent(rd);
711
712 /* Link the fd into the inode's list, obsoleting an old
713 one if necessary. */
714 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
715
716 up(&dir_f->sem);
717 jffs2_complete_reservation(c);
718
719 d_instantiate(dentry, inode);
720
721 return 0;
722}
723
724static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
725 struct inode *new_dir_i, struct dentry *new_dentry)
726{
727 int ret;
728 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
729 struct jffs2_inode_info *victim_f = NULL;
730 uint8_t type;
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100731 uint32_t now;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700732
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000733 /* The VFS will check for us and prevent trying to rename a
Linus Torvalds1da177e2005-04-16 15:20:36 -0700734 * file over a directory and vice versa, but if it's a directory,
735 * the VFS can't check whether the victim is empty. The filesystem
736 * needs to do that for itself.
737 */
738 if (new_dentry->d_inode) {
739 victim_f = JFFS2_INODE_INFO(new_dentry->d_inode);
740 if (S_ISDIR(new_dentry->d_inode->i_mode)) {
741 struct jffs2_full_dirent *fd;
742
743 down(&victim_f->sem);
744 for (fd = victim_f->dents; fd; fd = fd->next) {
745 if (fd->ino) {
746 up(&victim_f->sem);
747 return -ENOTEMPTY;
748 }
749 }
750 up(&victim_f->sem);
751 }
752 }
753
754 /* XXX: We probably ought to alloc enough space for
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000755 both nodes at the same time. Writing the new link,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756 then getting -ENOSPC, is quite bad :)
757 */
758
759 /* Make a hard link */
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000760
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761 /* XXX: This is ugly */
762 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
763 if (!type) type = DT_REG;
764
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100765 now = get_seconds();
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000766 ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767 old_dentry->d_inode->i_ino, type,
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100768 new_dentry->d_name.name, new_dentry->d_name.len, now);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769
770 if (ret)
771 return ret;
772
773 if (victim_f) {
774 /* There was a victim. Kill it off nicely */
775 new_dentry->d_inode->i_nlink--;
776 /* Don't oops if the victim was a dirent pointing to an
777 inode which didn't exist. */
778 if (victim_f->inocache) {
779 down(&victim_f->sem);
780 victim_f->inocache->nlink--;
781 up(&victim_f->sem);
782 }
783 }
784
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000785 /* If it was a directory we moved, and there was no victim,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786 increase i_nlink on its new parent */
787 if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f)
788 new_dir_i->i_nlink++;
789
790 /* Unlink the original */
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000791 ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100792 old_dentry->d_name.name, old_dentry->d_name.len, NULL, now);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700793
794 /* We don't touch inode->i_nlink */
795
796 if (ret) {
797 /* Oh shit. We really ought to make a single node which can do both atomically */
798 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
799 down(&f->sem);
800 old_dentry->d_inode->i_nlink++;
801 if (f->inocache)
802 f->inocache->nlink++;
803 up(&f->sem);
804
805 printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret);
806 /* Might as well let the VFS know */
807 d_instantiate(new_dentry, old_dentry->d_inode);
808 atomic_inc(&old_dentry->d_inode->i_count);
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100809 new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810 return ret;
811 }
812
813 if (S_ISDIR(old_dentry->d_inode->i_mode))
814 old_dir_i->i_nlink--;
815
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100816 new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now);
817
Linus Torvalds1da177e2005-04-16 15:20:36 -0700818 return 0;
819}
820