blob: 787e392ffd41bac38f0d3db617b0070faed368f6 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * JFFS2 -- Journalling Flash File System, Version 2.
3 *
David Woodhousec00c3102007-04-25 14:16:47 +01004 * Copyright © 2001-2007 Red Hat, Inc.
Linus Torvalds1da177e2005-04-16 15:20:36 -07005 *
6 * Created by David Woodhouse <dwmw2@infradead.org>
7 *
8 * For licensing information, see the file 'LICENCE' in this directory.
9 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 */
11
12#include <linux/kernel.h>
13#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070014#include <linux/fs.h>
15#include <linux/crc32.h>
16#include <linux/jffs2.h>
David Woodhousecbb9a562006-05-03 13:07:27 +010017#include "jffs2_fs_i.h"
18#include "jffs2_fs_sb.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070019#include <linux/time.h>
20#include "nodelist.h"
21
Linus Torvalds1da177e2005-04-16 15:20:36 -070022static int jffs2_readdir (struct file *, void *, filldir_t);
23
24static int jffs2_create (struct inode *,struct dentry *,int,
25 struct nameidata *);
26static struct dentry *jffs2_lookup (struct inode *,struct dentry *,
27 struct nameidata *);
28static int jffs2_link (struct dentry *,struct inode *,struct dentry *);
29static int jffs2_unlink (struct inode *,struct dentry *);
30static int jffs2_symlink (struct inode *,struct dentry *,const char *);
31static int jffs2_mkdir (struct inode *,struct dentry *,int);
32static int jffs2_rmdir (struct inode *,struct dentry *);
David Woodhouse265489f2005-07-06 13:13:13 +010033static int jffs2_mknod (struct inode *,struct dentry *,int,dev_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -070034static int jffs2_rename (struct inode *, struct dentry *,
David Woodhouseef53cb02007-07-10 10:01:22 +010035 struct inode *, struct dentry *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070036
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -080037const struct file_operations jffs2_dir_operations =
Linus Torvalds1da177e2005-04-16 15:20:36 -070038{
39 .read = generic_read_dir,
40 .readdir = jffs2_readdir,
41 .ioctl = jffs2_ioctl,
42 .fsync = jffs2_fsync
43};
44
45
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -080046const struct inode_operations jffs2_dir_inode_operations =
Linus Torvalds1da177e2005-04-16 15:20:36 -070047{
David Woodhouse265489f2005-07-06 13:13:13 +010048 .create = jffs2_create,
49 .lookup = jffs2_lookup,
Linus Torvalds1da177e2005-04-16 15:20:36 -070050 .link = jffs2_link,
51 .unlink = jffs2_unlink,
52 .symlink = jffs2_symlink,
53 .mkdir = jffs2_mkdir,
54 .rmdir = jffs2_rmdir,
55 .mknod = jffs2_mknod,
56 .rename = jffs2_rename,
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +090057 .permission = jffs2_permission,
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 .setattr = jffs2_setattr,
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +090059 .setxattr = jffs2_setxattr,
60 .getxattr = jffs2_getxattr,
61 .listxattr = jffs2_listxattr,
62 .removexattr = jffs2_removexattr
Linus Torvalds1da177e2005-04-16 15:20:36 -070063};
64
65/***********************************************************************/
66
67
68/* We keep the dirent list sorted in increasing order of name hash,
Thomas Gleixner182ec4e2005-11-07 11:16:07 +000069 and we use the same hash function as the dentries. Makes this
Linus Torvalds1da177e2005-04-16 15:20:36 -070070 nice and simple
71*/
72static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target,
73 struct nameidata *nd)
74{
75 struct jffs2_inode_info *dir_f;
76 struct jffs2_sb_info *c;
77 struct jffs2_full_dirent *fd = NULL, *fd_list;
78 uint32_t ino = 0;
79 struct inode *inode = NULL;
80
81 D1(printk(KERN_DEBUG "jffs2_lookup()\n"));
82
Richard Purdie373d5e72006-04-18 02:05:46 +010083 if (target->d_name.len > JFFS2_MAX_NAME_LEN)
84 return ERR_PTR(-ENAMETOOLONG);
85
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 dir_f = JFFS2_INODE_INFO(dir_i);
87 c = JFFS2_SB_INFO(dir_i->i_sb);
88
89 down(&dir_f->sem);
90
91 /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */
92 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 +000093 if (fd_list->nhash == target->d_name.hash &&
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 (!fd || fd_list->version > fd->version) &&
95 strlen(fd_list->name) == target->d_name.len &&
96 !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) {
97 fd = fd_list;
98 }
99 }
100 if (fd)
101 ino = fd->ino;
102 up(&dir_f->sem);
103 if (ino) {
104 inode = iget(dir_i->i_sb, ino);
105 if (!inode) {
106 printk(KERN_WARNING "iget() failed for ino #%u\n", ino);
107 return (ERR_PTR(-EIO));
108 }
109 }
110
111 d_add(target, inode);
112
113 return NULL;
114}
115
116/***********************************************************************/
117
118
119static int jffs2_readdir(struct file *filp, void *dirent, filldir_t filldir)
120{
121 struct jffs2_inode_info *f;
122 struct jffs2_sb_info *c;
Josef Sipekec2e2032006-12-08 02:37:16 -0800123 struct inode *inode = filp->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 struct jffs2_full_dirent *fd;
125 unsigned long offset, curofs;
126
Josef Sipekec2e2032006-12-08 02:37:16 -0800127 D1(printk(KERN_DEBUG "jffs2_readdir() for dir_i #%lu\n", filp->f_path.dentry->d_inode->i_ino));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128
129 f = JFFS2_INODE_INFO(inode);
130 c = JFFS2_SB_INFO(inode->i_sb);
131
132 offset = filp->f_pos;
133
134 if (offset == 0) {
135 D1(printk(KERN_DEBUG "Dirent 0: \".\", ino #%lu\n", inode->i_ino));
136 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
137 goto out;
138 offset++;
139 }
140 if (offset == 1) {
Josef Sipekec2e2032006-12-08 02:37:16 -0800141 unsigned long pino = parent_ino(filp->f_path.dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142 D1(printk(KERN_DEBUG "Dirent 1: \"..\", ino #%lu\n", pino));
143 if (filldir(dirent, "..", 2, 1, pino, DT_DIR) < 0)
144 goto out;
145 offset++;
146 }
147
148 curofs=1;
149 down(&f->sem);
150 for (fd = f->dents; fd; fd = fd->next) {
151
152 curofs++;
153 /* First loop: curofs = 2; offset = 2 */
154 if (curofs < offset) {
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000155 D2(printk(KERN_DEBUG "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 fd->name, fd->ino, fd->type, curofs, offset));
157 continue;
158 }
159 if (!fd->ino) {
160 D2(printk(KERN_DEBUG "Skipping deletion dirent \"%s\"\n", fd->name));
161 offset++;
162 continue;
163 }
164 D2(printk(KERN_DEBUG "Dirent %ld: \"%s\", ino #%u, type %d\n", offset, fd->name, fd->ino, fd->type));
165 if (filldir(dirent, fd->name, strlen(fd->name), offset, fd->ino, fd->type) < 0)
166 break;
167 offset++;
168 }
169 up(&f->sem);
170 out:
171 filp->f_pos = offset;
172 return 0;
173}
174
175/***********************************************************************/
176
177
178static int jffs2_create(struct inode *dir_i, struct dentry *dentry, int mode,
179 struct nameidata *nd)
180{
181 struct jffs2_raw_inode *ri;
182 struct jffs2_inode_info *f, *dir_f;
183 struct jffs2_sb_info *c;
184 struct inode *inode;
185 int ret;
186
187 ri = jffs2_alloc_raw_inode();
188 if (!ri)
189 return -ENOMEM;
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000190
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191 c = JFFS2_SB_INFO(dir_i->i_sb);
192
193 D1(printk(KERN_DEBUG "jffs2_create()\n"));
194
KaiGai Koheicfc8dc62007-09-14 15:16:35 +0900195 inode = jffs2_new_inode(dir_i, mode, ri);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196
197 if (IS_ERR(inode)) {
198 D1(printk(KERN_DEBUG "jffs2_new_inode() failed\n"));
199 jffs2_free_raw_inode(ri);
200 return PTR_ERR(inode);
201 }
202
203 inode->i_op = &jffs2_file_inode_operations;
204 inode->i_fop = &jffs2_file_operations;
205 inode->i_mapping->a_ops = &jffs2_file_address_operations;
206 inode->i_mapping->nrpages = 0;
207
208 f = JFFS2_INODE_INFO(inode);
209 dir_f = JFFS2_INODE_INFO(dir_i);
210
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000211 ret = jffs2_do_create(c, dir_f, f, ri,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 dentry->d_name.name, dentry->d_name.len);
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900213 if (ret)
214 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215
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;
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900224
225 fail:
226 make_bad_inode(inode);
227 iput(inode);
228 jffs2_free_raw_inode(ri);
229 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230}
231
232/***********************************************************************/
233
234
235static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry)
236{
237 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
238 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
239 struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode);
240 int ret;
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100241 uint32_t now = get_seconds();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000243 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100244 dentry->d_name.len, dead_f, now);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 if (dead_f->inocache)
246 dentry->d_inode->i_nlink = dead_f->inocache->nlink;
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100247 if (!ret)
248 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 return ret;
250}
251/***********************************************************************/
252
253
254static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
255{
256 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb);
257 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
258 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
259 int ret;
260 uint8_t type;
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100261 uint32_t now;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700262
263 /* Don't let people make hard links to bad inodes. */
264 if (!f->inocache)
265 return -EIO;
266
267 if (S_ISDIR(old_dentry->d_inode->i_mode))
268 return -EPERM;
269
270 /* XXX: This is ugly */
271 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
272 if (!type) type = DT_REG;
273
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100274 now = get_seconds();
275 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 -0700276
277 if (!ret) {
278 down(&f->sem);
279 old_dentry->d_inode->i_nlink = ++f->inocache->nlink;
280 up(&f->sem);
281 d_instantiate(dentry, old_dentry->d_inode);
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100282 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 atomic_inc(&old_dentry->d_inode->i_count);
284 }
285 return ret;
286}
287
288/***********************************************************************/
289
290static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target)
291{
292 struct jffs2_inode_info *f, *dir_f;
293 struct jffs2_sb_info *c;
294 struct inode *inode;
295 struct jffs2_raw_inode *ri;
296 struct jffs2_raw_dirent *rd;
297 struct jffs2_full_dnode *fn;
298 struct jffs2_full_dirent *fd;
299 int namelen;
David Woodhouse9fe48542006-05-23 00:38:06 +0100300 uint32_t alloclen;
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000301 int ret, targetlen = strlen(target);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302
303 /* FIXME: If you care. We'd need to use frags for the target
304 if it grows much more than this */
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000305 if (targetlen > 254)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 return -EINVAL;
307
308 ri = jffs2_alloc_raw_inode();
309
310 if (!ri)
311 return -ENOMEM;
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000312
Linus Torvalds1da177e2005-04-16 15:20:36 -0700313 c = JFFS2_SB_INFO(dir_i->i_sb);
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000314
315 /* Try to reserve enough space for both node and dirent.
316 * Just the node will do for now, though
Linus Torvalds1da177e2005-04-16 15:20:36 -0700317 */
318 namelen = dentry->d_name.len;
David Woodhouse9fe48542006-05-23 00:38:06 +0100319 ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen,
320 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321
322 if (ret) {
323 jffs2_free_raw_inode(ri);
324 return ret;
325 }
326
KaiGai Koheicfc8dc62007-09-14 15:16:35 +0900327 inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328
329 if (IS_ERR(inode)) {
330 jffs2_free_raw_inode(ri);
331 jffs2_complete_reservation(c);
332 return PTR_ERR(inode);
333 }
334
335 inode->i_op = &jffs2_symlink_inode_operations;
336
337 f = JFFS2_INODE_INFO(inode);
338
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000339 inode->i_size = targetlen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size);
341 ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size);
342 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
343
344 ri->compr = JFFS2_COMPR_NONE;
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000345 ri->data_crc = cpu_to_je32(crc32(0, target, targetlen));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000347
David Woodhouse9fe48542006-05-23 00:38:06 +0100348 fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349
350 jffs2_free_raw_inode(ri);
351
352 if (IS_ERR(fn)) {
353 /* Eeek. Wave bye bye */
354 up(&f->sem);
355 jffs2_complete_reservation(c);
356 jffs2_clear_inode(inode);
357 return PTR_ERR(fn);
358 }
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000359
Artem B. Bityutskiy2b79adc2005-07-17 12:13:51 +0100360 /* We use f->target field to store the target path. */
361 f->target = kmalloc(targetlen + 1, GFP_KERNEL);
362 if (!f->target) {
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000363 printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1);
364 up(&f->sem);
365 jffs2_complete_reservation(c);
366 jffs2_clear_inode(inode);
367 return -ENOMEM;
368 }
369
Artem B. Bityutskiy2b79adc2005-07-17 12:13:51 +0100370 memcpy(f->target, target, targetlen + 1);
371 D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->target));
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000372
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000373 /* No data here. Only a metadata node, which will be
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 obsoleted by the first data write
375 */
376 f->metadata = fn;
377 up(&f->sem);
378
379 jffs2_complete_reservation(c);
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900380
381 ret = jffs2_init_security(inode, dir_i);
382 if (ret) {
383 jffs2_clear_inode(inode);
384 return ret;
385 }
KaiGai Koheicfc8dc62007-09-14 15:16:35 +0900386 ret = jffs2_init_acl_post(inode);
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900387 if (ret) {
388 jffs2_clear_inode(inode);
389 return ret;
390 }
391
David Woodhouse9fe48542006-05-23 00:38:06 +0100392 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
393 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394 if (ret) {
395 /* Eep. */
396 jffs2_clear_inode(inode);
397 return ret;
398 }
399
400 rd = jffs2_alloc_raw_dirent();
401 if (!rd) {
402 /* Argh. Now we treat it like a normal delete */
403 jffs2_complete_reservation(c);
404 jffs2_clear_inode(inode);
405 return -ENOMEM;
406 }
407
408 dir_f = JFFS2_INODE_INFO(dir_i);
409 down(&dir_f->sem);
410
411 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
412 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
413 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
414 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
415
416 rd->pino = cpu_to_je32(dir_i->i_ino);
417 rd->version = cpu_to_je32(++dir_f->highest_version);
418 rd->ino = cpu_to_je32(inode->i_ino);
419 rd->mctime = cpu_to_je32(get_seconds());
420 rd->nsize = namelen;
421 rd->type = DT_LNK;
422 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
423 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
424
David Woodhouse9fe48542006-05-23 00:38:06 +0100425 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426
427 if (IS_ERR(fd)) {
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000428 /* dirent failed to write. Delete the inode normally
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429 as if it were the final unlink() */
430 jffs2_complete_reservation(c);
431 jffs2_free_raw_dirent(rd);
432 up(&dir_f->sem);
433 jffs2_clear_inode(inode);
434 return PTR_ERR(fd);
435 }
436
437 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
438
439 jffs2_free_raw_dirent(rd);
440
441 /* Link the fd into the inode's list, obsoleting an old
442 one if necessary. */
443 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
444
445 up(&dir_f->sem);
446 jffs2_complete_reservation(c);
447
448 d_instantiate(dentry, inode);
449 return 0;
450}
451
452
453static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode)
454{
455 struct jffs2_inode_info *f, *dir_f;
456 struct jffs2_sb_info *c;
457 struct inode *inode;
458 struct jffs2_raw_inode *ri;
459 struct jffs2_raw_dirent *rd;
460 struct jffs2_full_dnode *fn;
461 struct jffs2_full_dirent *fd;
462 int namelen;
David Woodhouse9fe48542006-05-23 00:38:06 +0100463 uint32_t alloclen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 int ret;
465
466 mode |= S_IFDIR;
467
468 ri = jffs2_alloc_raw_inode();
469 if (!ri)
470 return -ENOMEM;
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000471
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472 c = JFFS2_SB_INFO(dir_i->i_sb);
473
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000474 /* Try to reserve enough space for both node and dirent.
475 * Just the node will do for now, though
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 */
477 namelen = dentry->d_name.len;
David Woodhouse9fe48542006-05-23 00:38:06 +0100478 ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL,
479 JFFS2_SUMMARY_INODE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480
481 if (ret) {
482 jffs2_free_raw_inode(ri);
483 return ret;
484 }
485
KaiGai Koheicfc8dc62007-09-14 15:16:35 +0900486 inode = jffs2_new_inode(dir_i, mode, ri);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487
488 if (IS_ERR(inode)) {
489 jffs2_free_raw_inode(ri);
490 jffs2_complete_reservation(c);
491 return PTR_ERR(inode);
492 }
493
494 inode->i_op = &jffs2_dir_inode_operations;
495 inode->i_fop = &jffs2_dir_operations;
496 /* Directories get nlink 2 at start */
497 inode->i_nlink = 2;
498
499 f = JFFS2_INODE_INFO(inode);
500
501 ri->data_crc = cpu_to_je32(0);
502 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000503
David Woodhouse9fe48542006-05-23 00:38:06 +0100504 fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505
506 jffs2_free_raw_inode(ri);
507
508 if (IS_ERR(fn)) {
509 /* Eeek. Wave bye bye */
510 up(&f->sem);
511 jffs2_complete_reservation(c);
512 jffs2_clear_inode(inode);
513 return PTR_ERR(fn);
514 }
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000515 /* No data here. Only a metadata node, which will be
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516 obsoleted by the first data write
517 */
518 f->metadata = fn;
519 up(&f->sem);
520
521 jffs2_complete_reservation(c);
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900522
523 ret = jffs2_init_security(inode, dir_i);
524 if (ret) {
525 jffs2_clear_inode(inode);
526 return ret;
527 }
KaiGai Koheicfc8dc62007-09-14 15:16:35 +0900528 ret = jffs2_init_acl_post(inode);
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900529 if (ret) {
530 jffs2_clear_inode(inode);
531 return ret;
532 }
533
David Woodhouse9fe48542006-05-23 00:38:06 +0100534 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
535 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 if (ret) {
537 /* Eep. */
538 jffs2_clear_inode(inode);
539 return ret;
540 }
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000541
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 rd = jffs2_alloc_raw_dirent();
543 if (!rd) {
544 /* Argh. Now we treat it like a normal delete */
545 jffs2_complete_reservation(c);
546 jffs2_clear_inode(inode);
547 return -ENOMEM;
548 }
549
550 dir_f = JFFS2_INODE_INFO(dir_i);
551 down(&dir_f->sem);
552
553 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
554 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
555 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
556 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
557
558 rd->pino = cpu_to_je32(dir_i->i_ino);
559 rd->version = cpu_to_je32(++dir_f->highest_version);
560 rd->ino = cpu_to_je32(inode->i_ino);
561 rd->mctime = cpu_to_je32(get_seconds());
562 rd->nsize = namelen;
563 rd->type = DT_DIR;
564 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
565 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
566
David Woodhouse9fe48542006-05-23 00:38:06 +0100567 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000568
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569 if (IS_ERR(fd)) {
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000570 /* dirent failed to write. Delete the inode normally
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 as if it were the final unlink() */
572 jffs2_complete_reservation(c);
573 jffs2_free_raw_dirent(rd);
574 up(&dir_f->sem);
575 jffs2_clear_inode(inode);
576 return PTR_ERR(fd);
577 }
578
579 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
Dave Hansend8c76e62006-09-30 23:29:04 -0700580 inc_nlink(dir_i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581
582 jffs2_free_raw_dirent(rd);
583
584 /* Link the fd into the inode's list, obsoleting an old
585 one if necessary. */
586 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
587
588 up(&dir_f->sem);
589 jffs2_complete_reservation(c);
590
591 d_instantiate(dentry, inode);
592 return 0;
593}
594
595static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry)
596{
597 struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode);
598 struct jffs2_full_dirent *fd;
599 int ret;
600
601 for (fd = f->dents ; fd; fd = fd->next) {
602 if (fd->ino)
603 return -ENOTEMPTY;
604 }
605 ret = jffs2_unlink(dir_i, dentry);
606 if (!ret)
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700607 drop_nlink(dir_i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608 return ret;
609}
610
David Woodhouse265489f2005-07-06 13:13:13 +0100611static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, dev_t rdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700612{
613 struct jffs2_inode_info *f, *dir_f;
614 struct jffs2_sb_info *c;
615 struct inode *inode;
616 struct jffs2_raw_inode *ri;
617 struct jffs2_raw_dirent *rd;
618 struct jffs2_full_dnode *fn;
619 struct jffs2_full_dirent *fd;
620 int namelen;
David Woodhouseaef9ab42006-05-19 00:28:49 +0100621 union jffs2_device_node dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622 int devlen = 0;
David Woodhouse9fe48542006-05-23 00:38:06 +0100623 uint32_t alloclen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 int ret;
625
David Woodhouseaef9ab42006-05-19 00:28:49 +0100626 if (!new_valid_dev(rdev))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700627 return -EINVAL;
628
629 ri = jffs2_alloc_raw_inode();
630 if (!ri)
631 return -ENOMEM;
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000632
Linus Torvalds1da177e2005-04-16 15:20:36 -0700633 c = JFFS2_SB_INFO(dir_i->i_sb);
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000634
David Woodhouseaef9ab42006-05-19 00:28:49 +0100635 if (S_ISBLK(mode) || S_ISCHR(mode))
636 devlen = jffs2_encode_dev(&dev, rdev);
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000637
638 /* Try to reserve enough space for both node and dirent.
639 * Just the node will do for now, though
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640 */
641 namelen = dentry->d_name.len;
David Woodhouse9fe48542006-05-23 00:38:06 +0100642 ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen,
David Woodhouseaef9ab42006-05-19 00:28:49 +0100643 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644
645 if (ret) {
646 jffs2_free_raw_inode(ri);
647 return ret;
648 }
649
KaiGai Koheicfc8dc62007-09-14 15:16:35 +0900650 inode = jffs2_new_inode(dir_i, mode, ri);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651
652 if (IS_ERR(inode)) {
653 jffs2_free_raw_inode(ri);
654 jffs2_complete_reservation(c);
655 return PTR_ERR(inode);
656 }
657 inode->i_op = &jffs2_file_inode_operations;
658 init_special_inode(inode, inode->i_mode, rdev);
659
660 f = JFFS2_INODE_INFO(inode);
661
662 ri->dsize = ri->csize = cpu_to_je32(devlen);
663 ri->totlen = cpu_to_je32(sizeof(*ri) + devlen);
664 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
665
666 ri->compr = JFFS2_COMPR_NONE;
667 ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen));
668 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000669
David Woodhouse9fe48542006-05-23 00:38:06 +0100670 fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700671
672 jffs2_free_raw_inode(ri);
673
674 if (IS_ERR(fn)) {
675 /* Eeek. Wave bye bye */
676 up(&f->sem);
677 jffs2_complete_reservation(c);
678 jffs2_clear_inode(inode);
679 return PTR_ERR(fn);
680 }
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000681 /* No data here. Only a metadata node, which will be
Linus Torvalds1da177e2005-04-16 15:20:36 -0700682 obsoleted by the first data write
683 */
684 f->metadata = fn;
685 up(&f->sem);
686
687 jffs2_complete_reservation(c);
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900688
689 ret = jffs2_init_security(inode, dir_i);
690 if (ret) {
691 jffs2_clear_inode(inode);
692 return ret;
693 }
KaiGai Koheicfc8dc62007-09-14 15:16:35 +0900694 ret = jffs2_init_acl_post(inode);
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900695 if (ret) {
696 jffs2_clear_inode(inode);
697 return ret;
698 }
699
David Woodhouse9fe48542006-05-23 00:38:06 +0100700 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
701 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702 if (ret) {
703 /* Eep. */
704 jffs2_clear_inode(inode);
705 return ret;
706 }
707
708 rd = jffs2_alloc_raw_dirent();
709 if (!rd) {
710 /* Argh. Now we treat it like a normal delete */
711 jffs2_complete_reservation(c);
712 jffs2_clear_inode(inode);
713 return -ENOMEM;
714 }
715
716 dir_f = JFFS2_INODE_INFO(dir_i);
717 down(&dir_f->sem);
718
719 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
720 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
721 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
722 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
723
724 rd->pino = cpu_to_je32(dir_i->i_ino);
725 rd->version = cpu_to_je32(++dir_f->highest_version);
726 rd->ino = cpu_to_je32(inode->i_ino);
727 rd->mctime = cpu_to_je32(get_seconds());
728 rd->nsize = namelen;
729
730 /* XXX: This is ugly. */
731 rd->type = (mode & S_IFMT) >> 12;
732
733 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
734 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
735
David Woodhouse9fe48542006-05-23 00:38:06 +0100736 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000737
Linus Torvalds1da177e2005-04-16 15:20:36 -0700738 if (IS_ERR(fd)) {
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000739 /* dirent failed to write. Delete the inode normally
Linus Torvalds1da177e2005-04-16 15:20:36 -0700740 as if it were the final unlink() */
741 jffs2_complete_reservation(c);
742 jffs2_free_raw_dirent(rd);
743 up(&dir_f->sem);
744 jffs2_clear_inode(inode);
745 return PTR_ERR(fd);
746 }
747
748 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
749
750 jffs2_free_raw_dirent(rd);
751
752 /* Link the fd into the inode's list, obsoleting an old
753 one if necessary. */
754 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
755
756 up(&dir_f->sem);
757 jffs2_complete_reservation(c);
758
759 d_instantiate(dentry, inode);
760
761 return 0;
762}
763
764static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
David Woodhouseef53cb02007-07-10 10:01:22 +0100765 struct inode *new_dir_i, struct dentry *new_dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700766{
767 int ret;
768 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
769 struct jffs2_inode_info *victim_f = NULL;
770 uint8_t type;
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100771 uint32_t now;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700772
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000773 /* The VFS will check for us and prevent trying to rename a
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774 * file over a directory and vice versa, but if it's a directory,
775 * the VFS can't check whether the victim is empty. The filesystem
776 * needs to do that for itself.
777 */
778 if (new_dentry->d_inode) {
779 victim_f = JFFS2_INODE_INFO(new_dentry->d_inode);
780 if (S_ISDIR(new_dentry->d_inode->i_mode)) {
781 struct jffs2_full_dirent *fd;
782
783 down(&victim_f->sem);
784 for (fd = victim_f->dents; fd; fd = fd->next) {
785 if (fd->ino) {
786 up(&victim_f->sem);
787 return -ENOTEMPTY;
788 }
789 }
790 up(&victim_f->sem);
791 }
792 }
793
794 /* XXX: We probably ought to alloc enough space for
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000795 both nodes at the same time. Writing the new link,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796 then getting -ENOSPC, is quite bad :)
797 */
798
799 /* Make a hard link */
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000800
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801 /* XXX: This is ugly */
802 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
803 if (!type) type = DT_REG;
804
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100805 now = get_seconds();
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000806 ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807 old_dentry->d_inode->i_ino, type,
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100808 new_dentry->d_name.name, new_dentry->d_name.len, now);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809
810 if (ret)
811 return ret;
812
813 if (victim_f) {
814 /* There was a victim. Kill it off nicely */
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700815 drop_nlink(new_dentry->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700816 /* Don't oops if the victim was a dirent pointing to an
817 inode which didn't exist. */
818 if (victim_f->inocache) {
819 down(&victim_f->sem);
820 victim_f->inocache->nlink--;
821 up(&victim_f->sem);
822 }
823 }
824
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000825 /* If it was a directory we moved, and there was no victim,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700826 increase i_nlink on its new parent */
827 if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f)
Dave Hansend8c76e62006-09-30 23:29:04 -0700828 inc_nlink(new_dir_i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700829
830 /* Unlink the original */
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000831 ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100832 old_dentry->d_name.name, old_dentry->d_name.len, NULL, now);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700833
834 /* We don't touch inode->i_nlink */
835
836 if (ret) {
837 /* Oh shit. We really ought to make a single node which can do both atomically */
838 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
839 down(&f->sem);
Dave Hansend8c76e62006-09-30 23:29:04 -0700840 inc_nlink(old_dentry->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841 if (f->inocache)
842 f->inocache->nlink++;
843 up(&f->sem);
844
845 printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret);
846 /* Might as well let the VFS know */
847 d_instantiate(new_dentry, old_dentry->d_inode);
848 atomic_inc(&old_dentry->d_inode->i_count);
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100849 new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850 return ret;
851 }
852
853 if (S_ISDIR(old_dentry->d_inode->i_mode))
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700854 drop_nlink(old_dir_i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700855
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100856 new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now);
857
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858 return 0;
859}
860