blob: ed78a3cf3cb047046d8ea385af9554e63214aac8 [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.
David Woodhouse6088c052010-08-08 14:15:22 +01005 * Copyright © 2004-2010 David Woodhouse <dwmw2@infradead.org>
Linus Torvalds1da177e2005-04-16 15:20:36 -07006 *
7 * Created by David Woodhouse <dwmw2@infradead.org>
8 *
9 * For licensing information, see the file 'LICENCE' in this directory.
10 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070011 */
12
13#include <linux/kernel.h>
14#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/fs.h>
16#include <linux/crc32.h>
17#include <linux/jffs2.h>
David Woodhousecbb9a562006-05-03 13:07:27 +010018#include "jffs2_fs_i.h"
19#include "jffs2_fs_sb.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070020#include <linux/time.h>
21#include "nodelist.h"
22
Linus Torvalds1da177e2005-04-16 15:20:36 -070023static int jffs2_readdir (struct file *, void *, filldir_t);
24
25static int jffs2_create (struct inode *,struct dentry *,int,
26 struct nameidata *);
27static struct dentry *jffs2_lookup (struct inode *,struct dentry *,
28 struct nameidata *);
29static int jffs2_link (struct dentry *,struct inode *,struct dentry *);
30static int jffs2_unlink (struct inode *,struct dentry *);
31static int jffs2_symlink (struct inode *,struct dentry *,const char *);
32static int jffs2_mkdir (struct inode *,struct dentry *,int);
33static int jffs2_rmdir (struct inode *,struct dentry *);
David Woodhouse265489f2005-07-06 13:13:13 +010034static int jffs2_mknod (struct inode *,struct dentry *,int,dev_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -070035static int jffs2_rename (struct inode *, struct dentry *,
David Woodhouseef53cb02007-07-10 10:01:22 +010036 struct inode *, struct dentry *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070037
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -080038const struct file_operations jffs2_dir_operations =
Linus Torvalds1da177e2005-04-16 15:20:36 -070039{
40 .read = generic_read_dir,
41 .readdir = jffs2_readdir,
Stoyan Gaydarov05334002008-07-07 07:45:59 -050042 .unlocked_ioctl=jffs2_ioctl,
Christoph Hellwig3222a3e2008-09-03 21:53:01 +020043 .fsync = jffs2_fsync,
44 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -070045};
46
47
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -080048const struct inode_operations jffs2_dir_inode_operations =
Linus Torvalds1da177e2005-04-16 15:20:36 -070049{
David Woodhouse265489f2005-07-06 13:13:13 +010050 .create = jffs2_create,
51 .lookup = jffs2_lookup,
Linus Torvalds1da177e2005-04-16 15:20:36 -070052 .link = jffs2_link,
53 .unlink = jffs2_unlink,
54 .symlink = jffs2_symlink,
55 .mkdir = jffs2_mkdir,
56 .rmdir = jffs2_rmdir,
57 .mknod = jffs2_mknod,
58 .rename = jffs2_rename,
Linus Torvalds18f4c642009-08-28 12:29:03 -070059 .check_acl = jffs2_check_acl,
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 .setattr = jffs2_setattr,
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +090061 .setxattr = jffs2_setxattr,
62 .getxattr = jffs2_getxattr,
63 .listxattr = jffs2_listxattr,
64 .removexattr = jffs2_removexattr
Linus Torvalds1da177e2005-04-16 15:20:36 -070065};
66
67/***********************************************************************/
68
69
70/* We keep the dirent list sorted in increasing order of name hash,
Thomas Gleixner182ec4e2005-11-07 11:16:07 +000071 and we use the same hash function as the dentries. Makes this
Linus Torvalds1da177e2005-04-16 15:20:36 -070072 nice and simple
73*/
74static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target,
75 struct nameidata *nd)
76{
77 struct jffs2_inode_info *dir_f;
78 struct jffs2_sb_info *c;
79 struct jffs2_full_dirent *fd = NULL, *fd_list;
80 uint32_t ino = 0;
81 struct inode *inode = NULL;
82
83 D1(printk(KERN_DEBUG "jffs2_lookup()\n"));
84
Richard Purdie373d5e72006-04-18 02:05:46 +010085 if (target->d_name.len > JFFS2_MAX_NAME_LEN)
86 return ERR_PTR(-ENAMETOOLONG);
87
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 dir_f = JFFS2_INODE_INFO(dir_i);
89 c = JFFS2_SB_INFO(dir_i->i_sb);
90
David Woodhouseced22072008-04-22 15:13:40 +010091 mutex_lock(&dir_f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -070092
93 /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */
94 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 +000095 if (fd_list->nhash == target->d_name.hash &&
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 (!fd || fd_list->version > fd->version) &&
97 strlen(fd_list->name) == target->d_name.len &&
98 !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) {
99 fd = fd_list;
100 }
101 }
102 if (fd)
103 ino = fd->ino;
David Woodhouseced22072008-04-22 15:13:40 +0100104 mutex_unlock(&dir_f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 if (ino) {
David Howells5451f792008-02-07 00:15:42 -0800106 inode = jffs2_iget(dir_i->i_sb, ino);
107 if (IS_ERR(inode)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 printk(KERN_WARNING "iget() failed for ino #%u\n", ino);
David Howells5451f792008-02-07 00:15:42 -0800109 return ERR_CAST(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 }
111 }
112
David Woodhouse8966c5e2008-08-18 15:36:47 +0100113 return d_splice_alias(inode, target);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114}
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;
David Woodhouseced22072008-04-22 15:13:40 +0100149 mutex_lock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 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 }
David Woodhouseced22072008-04-22 15:13:40 +0100169 mutex_unlock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170 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
David Woodhouse590fe342008-05-01 15:53:28 +0100211 /* jffs2_do_create() will want to lock it, _after_ reserving
212 space and taking c-alloc_sem. If we keep it locked here,
213 lockdep gets unhappy (although it's a false positive;
214 nothing else will be looking at this inode yet so there's
215 no chance of AB-BA deadlock involving its f->sem). */
216 mutex_unlock(&f->sem);
217
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000218 ret = jffs2_do_create(c, dir_f, f, ri,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 dentry->d_name.name, dentry->d_name.len);
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900220 if (ret)
221 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222
223 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime));
224
225 jffs2_free_raw_inode(ri);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226
227 D1(printk(KERN_DEBUG "jffs2_create: Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n",
David Woodhouse27c72b02008-05-01 18:47:17 +0100228 inode->i_ino, inode->i_mode, inode->i_nlink,
229 f->inocache->pino_nlink, inode->i_mapping->nrpages));
David Woodhousee72e6492010-06-03 08:09:12 +0100230
231 d_instantiate(dentry, inode);
232 unlock_new_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 return 0;
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900234
235 fail:
Al Viro41cce642010-06-08 13:24:56 -0400236 iget_failed(inode);
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900237 jffs2_free_raw_inode(ri);
238 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239}
240
241/***********************************************************************/
242
243
244static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry)
245{
246 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
247 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
248 struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode);
249 int ret;
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100250 uint32_t now = get_seconds();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000252 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100253 dentry->d_name.len, dead_f, now);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 if (dead_f->inocache)
David Woodhouse27c72b02008-05-01 18:47:17 +0100255 dentry->d_inode->i_nlink = dead_f->inocache->pino_nlink;
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100256 if (!ret)
257 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 return ret;
259}
260/***********************************************************************/
261
262
263static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
264{
265 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb);
266 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
267 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
268 int ret;
269 uint8_t type;
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100270 uint32_t now;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271
272 /* Don't let people make hard links to bad inodes. */
273 if (!f->inocache)
274 return -EIO;
275
276 if (S_ISDIR(old_dentry->d_inode->i_mode))
277 return -EPERM;
278
279 /* XXX: This is ugly */
280 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
281 if (!type) type = DT_REG;
282
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100283 now = get_seconds();
284 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 -0700285
286 if (!ret) {
David Woodhouseced22072008-04-22 15:13:40 +0100287 mutex_lock(&f->sem);
David Woodhouse27c72b02008-05-01 18:47:17 +0100288 old_dentry->d_inode->i_nlink = ++f->inocache->pino_nlink;
David Woodhouseced22072008-04-22 15:13:40 +0100289 mutex_unlock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 d_instantiate(dentry, old_dentry->d_inode);
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100291 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 atomic_inc(&old_dentry->d_inode->i_count);
293 }
294 return ret;
295}
296
297/***********************************************************************/
298
299static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target)
300{
301 struct jffs2_inode_info *f, *dir_f;
302 struct jffs2_sb_info *c;
303 struct inode *inode;
304 struct jffs2_raw_inode *ri;
305 struct jffs2_raw_dirent *rd;
306 struct jffs2_full_dnode *fn;
307 struct jffs2_full_dirent *fd;
308 int namelen;
David Woodhouse9fe48542006-05-23 00:38:06 +0100309 uint32_t alloclen;
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000310 int ret, targetlen = strlen(target);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311
312 /* FIXME: If you care. We'd need to use frags for the target
313 if it grows much more than this */
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000314 if (targetlen > 254)
Adrian Hunterbde86fe2008-08-14 11:57:45 +0300315 return -ENAMETOOLONG;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316
317 ri = jffs2_alloc_raw_inode();
318
319 if (!ri)
320 return -ENOMEM;
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000321
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 c = JFFS2_SB_INFO(dir_i->i_sb);
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000323
324 /* Try to reserve enough space for both node and dirent.
325 * Just the node will do for now, though
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326 */
327 namelen = dentry->d_name.len;
David Woodhouse9fe48542006-05-23 00:38:06 +0100328 ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen,
329 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330
331 if (ret) {
332 jffs2_free_raw_inode(ri);
333 return ret;
334 }
335
KaiGai Koheicfc8dc62007-09-14 15:16:35 +0900336 inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337
338 if (IS_ERR(inode)) {
339 jffs2_free_raw_inode(ri);
340 jffs2_complete_reservation(c);
341 return PTR_ERR(inode);
342 }
343
344 inode->i_op = &jffs2_symlink_inode_operations;
345
346 f = JFFS2_INODE_INFO(inode);
347
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000348 inode->i_size = targetlen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size);
350 ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size);
351 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
352
353 ri->compr = JFFS2_COMPR_NONE;
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000354 ri->data_crc = cpu_to_je32(crc32(0, target, targetlen));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000356
David Woodhouse9fe48542006-05-23 00:38:06 +0100357 fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358
359 jffs2_free_raw_inode(ri);
360
361 if (IS_ERR(fn)) {
362 /* Eeek. Wave bye bye */
David Woodhouseced22072008-04-22 15:13:40 +0100363 mutex_unlock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700364 jffs2_complete_reservation(c);
David Woodhousef324e4c2010-06-03 08:03:39 +0100365 ret = PTR_ERR(fn);
366 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700367 }
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000368
Artem B. Bityutskiy2b79adc2005-07-17 12:13:51 +0100369 /* We use f->target field to store the target path. */
370 f->target = kmalloc(targetlen + 1, GFP_KERNEL);
371 if (!f->target) {
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000372 printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1);
David Woodhouseced22072008-04-22 15:13:40 +0100373 mutex_unlock(&f->sem);
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000374 jffs2_complete_reservation(c);
David Woodhousef324e4c2010-06-03 08:03:39 +0100375 ret = -ENOMEM;
376 goto fail;
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000377 }
378
Artem B. Bityutskiy2b79adc2005-07-17 12:13:51 +0100379 memcpy(f->target, target, targetlen + 1);
380 D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->target));
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000381
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000382 /* No data here. Only a metadata node, which will be
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 obsoleted by the first data write
384 */
385 f->metadata = fn;
David Woodhouseced22072008-04-22 15:13:40 +0100386 mutex_unlock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387
388 jffs2_complete_reservation(c);
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900389
390 ret = jffs2_init_security(inode, dir_i);
David Woodhousef324e4c2010-06-03 08:03:39 +0100391 if (ret)
392 goto fail;
393
KaiGai Koheicfc8dc62007-09-14 15:16:35 +0900394 ret = jffs2_init_acl_post(inode);
David Woodhousef324e4c2010-06-03 08:03:39 +0100395 if (ret)
396 goto fail;
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900397
David Woodhouse9fe48542006-05-23 00:38:06 +0100398 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
399 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
David Woodhousef324e4c2010-06-03 08:03:39 +0100400 if (ret)
401 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402
403 rd = jffs2_alloc_raw_dirent();
404 if (!rd) {
405 /* Argh. Now we treat it like a normal delete */
406 jffs2_complete_reservation(c);
David Woodhousef324e4c2010-06-03 08:03:39 +0100407 ret = -ENOMEM;
408 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700409 }
410
411 dir_f = JFFS2_INODE_INFO(dir_i);
David Woodhouseced22072008-04-22 15:13:40 +0100412 mutex_lock(&dir_f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413
414 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
415 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
416 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
417 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
418
419 rd->pino = cpu_to_je32(dir_i->i_ino);
420 rd->version = cpu_to_je32(++dir_f->highest_version);
421 rd->ino = cpu_to_je32(inode->i_ino);
422 rd->mctime = cpu_to_je32(get_seconds());
423 rd->nsize = namelen;
424 rd->type = DT_LNK;
425 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
426 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
427
David Woodhouse9fe48542006-05-23 00:38:06 +0100428 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700429
430 if (IS_ERR(fd)) {
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000431 /* dirent failed to write. Delete the inode normally
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 as if it were the final unlink() */
433 jffs2_complete_reservation(c);
434 jffs2_free_raw_dirent(rd);
David Woodhouseced22072008-04-22 15:13:40 +0100435 mutex_unlock(&dir_f->sem);
David Woodhousef324e4c2010-06-03 08:03:39 +0100436 ret = PTR_ERR(fd);
437 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700438 }
439
440 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
441
442 jffs2_free_raw_dirent(rd);
443
444 /* Link the fd into the inode's list, obsoleting an old
445 one if necessary. */
446 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
447
David Woodhouseced22072008-04-22 15:13:40 +0100448 mutex_unlock(&dir_f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700449 jffs2_complete_reservation(c);
450
451 d_instantiate(dentry, inode);
David Woodhousee72e6492010-06-03 08:09:12 +0100452 unlock_new_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 return 0;
David Woodhousef324e4c2010-06-03 08:03:39 +0100454
455 fail:
Al Viro41cce642010-06-08 13:24:56 -0400456 iget_failed(inode);
David Woodhousef324e4c2010-06-03 08:03:39 +0100457 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458}
459
460
461static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode)
462{
463 struct jffs2_inode_info *f, *dir_f;
464 struct jffs2_sb_info *c;
465 struct inode *inode;
466 struct jffs2_raw_inode *ri;
467 struct jffs2_raw_dirent *rd;
468 struct jffs2_full_dnode *fn;
469 struct jffs2_full_dirent *fd;
470 int namelen;
David Woodhouse9fe48542006-05-23 00:38:06 +0100471 uint32_t alloclen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472 int ret;
473
474 mode |= S_IFDIR;
475
476 ri = jffs2_alloc_raw_inode();
477 if (!ri)
478 return -ENOMEM;
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000479
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480 c = JFFS2_SB_INFO(dir_i->i_sb);
481
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000482 /* Try to reserve enough space for both node and dirent.
483 * Just the node will do for now, though
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484 */
485 namelen = dentry->d_name.len;
David Woodhouse9fe48542006-05-23 00:38:06 +0100486 ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL,
487 JFFS2_SUMMARY_INODE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488
489 if (ret) {
490 jffs2_free_raw_inode(ri);
491 return ret;
492 }
493
KaiGai Koheicfc8dc62007-09-14 15:16:35 +0900494 inode = jffs2_new_inode(dir_i, mode, ri);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495
496 if (IS_ERR(inode)) {
497 jffs2_free_raw_inode(ri);
498 jffs2_complete_reservation(c);
499 return PTR_ERR(inode);
500 }
501
502 inode->i_op = &jffs2_dir_inode_operations;
503 inode->i_fop = &jffs2_dir_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504
505 f = JFFS2_INODE_INFO(inode);
506
David Woodhouse27c72b02008-05-01 18:47:17 +0100507 /* Directories get nlink 2 at start */
508 inode->i_nlink = 2;
509 /* but ic->pino_nlink is the parent ino# */
510 f->inocache->pino_nlink = dir_i->i_ino;
511
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512 ri->data_crc = cpu_to_je32(0);
513 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000514
David Woodhouse9fe48542006-05-23 00:38:06 +0100515 fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700516
517 jffs2_free_raw_inode(ri);
518
519 if (IS_ERR(fn)) {
520 /* Eeek. Wave bye bye */
David Woodhouseced22072008-04-22 15:13:40 +0100521 mutex_unlock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522 jffs2_complete_reservation(c);
David Woodhousef324e4c2010-06-03 08:03:39 +0100523 ret = PTR_ERR(fn);
524 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525 }
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000526 /* No data here. Only a metadata node, which will be
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527 obsoleted by the first data write
528 */
529 f->metadata = fn;
David Woodhouseced22072008-04-22 15:13:40 +0100530 mutex_unlock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531
532 jffs2_complete_reservation(c);
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900533
534 ret = jffs2_init_security(inode, dir_i);
David Woodhousef324e4c2010-06-03 08:03:39 +0100535 if (ret)
536 goto fail;
537
KaiGai Koheicfc8dc62007-09-14 15:16:35 +0900538 ret = jffs2_init_acl_post(inode);
David Woodhousef324e4c2010-06-03 08:03:39 +0100539 if (ret)
540 goto fail;
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900541
David Woodhouse9fe48542006-05-23 00:38:06 +0100542 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
543 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
David Woodhousef324e4c2010-06-03 08:03:39 +0100544 if (ret)
545 goto fail;
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000546
Linus Torvalds1da177e2005-04-16 15:20:36 -0700547 rd = jffs2_alloc_raw_dirent();
548 if (!rd) {
549 /* Argh. Now we treat it like a normal delete */
550 jffs2_complete_reservation(c);
David Woodhousef324e4c2010-06-03 08:03:39 +0100551 ret = -ENOMEM;
552 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 }
554
555 dir_f = JFFS2_INODE_INFO(dir_i);
David Woodhouseced22072008-04-22 15:13:40 +0100556 mutex_lock(&dir_f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700557
558 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
559 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
560 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
561 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
562
563 rd->pino = cpu_to_je32(dir_i->i_ino);
564 rd->version = cpu_to_je32(++dir_f->highest_version);
565 rd->ino = cpu_to_je32(inode->i_ino);
566 rd->mctime = cpu_to_je32(get_seconds());
567 rd->nsize = namelen;
568 rd->type = DT_DIR;
569 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
570 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
571
David Woodhouse9fe48542006-05-23 00:38:06 +0100572 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000573
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 if (IS_ERR(fd)) {
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000575 /* dirent failed to write. Delete the inode normally
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576 as if it were the final unlink() */
577 jffs2_complete_reservation(c);
578 jffs2_free_raw_dirent(rd);
David Woodhouseced22072008-04-22 15:13:40 +0100579 mutex_unlock(&dir_f->sem);
David Woodhousef324e4c2010-06-03 08:03:39 +0100580 ret = PTR_ERR(fd);
581 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582 }
583
584 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
Dave Hansend8c76e62006-09-30 23:29:04 -0700585 inc_nlink(dir_i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586
587 jffs2_free_raw_dirent(rd);
588
589 /* Link the fd into the inode's list, obsoleting an old
590 one if necessary. */
591 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
592
David Woodhouseced22072008-04-22 15:13:40 +0100593 mutex_unlock(&dir_f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700594 jffs2_complete_reservation(c);
595
596 d_instantiate(dentry, inode);
David Woodhousee72e6492010-06-03 08:09:12 +0100597 unlock_new_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700598 return 0;
David Woodhousef324e4c2010-06-03 08:03:39 +0100599
600 fail:
Al Viro41cce642010-06-08 13:24:56 -0400601 iget_failed(inode);
David Woodhousef324e4c2010-06-03 08:03:39 +0100602 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603}
604
605static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry)
606{
David Woodhouse27c72b02008-05-01 18:47:17 +0100607 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
608 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609 struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode);
610 struct jffs2_full_dirent *fd;
611 int ret;
David Woodhouse27c72b02008-05-01 18:47:17 +0100612 uint32_t now = get_seconds();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613
614 for (fd = f->dents ; fd; fd = fd->next) {
615 if (fd->ino)
616 return -ENOTEMPTY;
617 }
David Woodhouse27c72b02008-05-01 18:47:17 +0100618
619 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
620 dentry->d_name.len, f, now);
621 if (!ret) {
622 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
623 clear_nlink(dentry->d_inode);
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700624 drop_nlink(dir_i);
David Woodhouse27c72b02008-05-01 18:47:17 +0100625 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700626 return ret;
627}
628
David Woodhouse265489f2005-07-06 13:13:13 +0100629static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, dev_t rdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630{
631 struct jffs2_inode_info *f, *dir_f;
632 struct jffs2_sb_info *c;
633 struct inode *inode;
634 struct jffs2_raw_inode *ri;
635 struct jffs2_raw_dirent *rd;
636 struct jffs2_full_dnode *fn;
637 struct jffs2_full_dirent *fd;
638 int namelen;
David Woodhouseaef9ab42006-05-19 00:28:49 +0100639 union jffs2_device_node dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640 int devlen = 0;
David Woodhouse9fe48542006-05-23 00:38:06 +0100641 uint32_t alloclen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642 int ret;
643
David Woodhouseaef9ab42006-05-19 00:28:49 +0100644 if (!new_valid_dev(rdev))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645 return -EINVAL;
646
647 ri = jffs2_alloc_raw_inode();
648 if (!ri)
649 return -ENOMEM;
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000650
Linus Torvalds1da177e2005-04-16 15:20:36 -0700651 c = JFFS2_SB_INFO(dir_i->i_sb);
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000652
David Woodhouseaef9ab42006-05-19 00:28:49 +0100653 if (S_ISBLK(mode) || S_ISCHR(mode))
654 devlen = jffs2_encode_dev(&dev, rdev);
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000655
656 /* Try to reserve enough space for both node and dirent.
657 * Just the node will do for now, though
Linus Torvalds1da177e2005-04-16 15:20:36 -0700658 */
659 namelen = dentry->d_name.len;
David Woodhouse9fe48542006-05-23 00:38:06 +0100660 ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen,
David Woodhouseaef9ab42006-05-19 00:28:49 +0100661 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700662
663 if (ret) {
664 jffs2_free_raw_inode(ri);
665 return ret;
666 }
667
KaiGai Koheicfc8dc62007-09-14 15:16:35 +0900668 inode = jffs2_new_inode(dir_i, mode, ri);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700669
670 if (IS_ERR(inode)) {
671 jffs2_free_raw_inode(ri);
672 jffs2_complete_reservation(c);
673 return PTR_ERR(inode);
674 }
675 inode->i_op = &jffs2_file_inode_operations;
676 init_special_inode(inode, inode->i_mode, rdev);
677
678 f = JFFS2_INODE_INFO(inode);
679
680 ri->dsize = ri->csize = cpu_to_je32(devlen);
681 ri->totlen = cpu_to_je32(sizeof(*ri) + devlen);
682 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
683
684 ri->compr = JFFS2_COMPR_NONE;
685 ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen));
686 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000687
David Woodhouse9fe48542006-05-23 00:38:06 +0100688 fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700689
690 jffs2_free_raw_inode(ri);
691
692 if (IS_ERR(fn)) {
693 /* Eeek. Wave bye bye */
David Woodhouseced22072008-04-22 15:13:40 +0100694 mutex_unlock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700695 jffs2_complete_reservation(c);
David Woodhousef324e4c2010-06-03 08:03:39 +0100696 ret = PTR_ERR(fn);
697 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698 }
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000699 /* No data here. Only a metadata node, which will be
Linus Torvalds1da177e2005-04-16 15:20:36 -0700700 obsoleted by the first data write
701 */
702 f->metadata = fn;
David Woodhouseced22072008-04-22 15:13:40 +0100703 mutex_unlock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700704
705 jffs2_complete_reservation(c);
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900706
707 ret = jffs2_init_security(inode, dir_i);
David Woodhousef324e4c2010-06-03 08:03:39 +0100708 if (ret)
709 goto fail;
710
KaiGai Koheicfc8dc62007-09-14 15:16:35 +0900711 ret = jffs2_init_acl_post(inode);
David Woodhousef324e4c2010-06-03 08:03:39 +0100712 if (ret)
713 goto fail;
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900714
David Woodhouse9fe48542006-05-23 00:38:06 +0100715 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
716 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
David Woodhousef324e4c2010-06-03 08:03:39 +0100717 if (ret)
718 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700719
720 rd = jffs2_alloc_raw_dirent();
721 if (!rd) {
722 /* Argh. Now we treat it like a normal delete */
723 jffs2_complete_reservation(c);
David Woodhousef324e4c2010-06-03 08:03:39 +0100724 ret = -ENOMEM;
725 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700726 }
727
728 dir_f = JFFS2_INODE_INFO(dir_i);
David Woodhouseced22072008-04-22 15:13:40 +0100729 mutex_lock(&dir_f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700730
731 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
732 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
733 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
734 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
735
736 rd->pino = cpu_to_je32(dir_i->i_ino);
737 rd->version = cpu_to_je32(++dir_f->highest_version);
738 rd->ino = cpu_to_je32(inode->i_ino);
739 rd->mctime = cpu_to_je32(get_seconds());
740 rd->nsize = namelen;
741
742 /* XXX: This is ugly. */
743 rd->type = (mode & S_IFMT) >> 12;
744
745 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
746 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
747
David Woodhouse9fe48542006-05-23 00:38:06 +0100748 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000749
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750 if (IS_ERR(fd)) {
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000751 /* dirent failed to write. Delete the inode normally
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752 as if it were the final unlink() */
753 jffs2_complete_reservation(c);
754 jffs2_free_raw_dirent(rd);
David Woodhouseced22072008-04-22 15:13:40 +0100755 mutex_unlock(&dir_f->sem);
David Woodhousef324e4c2010-06-03 08:03:39 +0100756 ret = PTR_ERR(fd);
757 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700758 }
759
760 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
761
762 jffs2_free_raw_dirent(rd);
763
764 /* Link the fd into the inode's list, obsoleting an old
765 one if necessary. */
766 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
767
David Woodhouseced22072008-04-22 15:13:40 +0100768 mutex_unlock(&dir_f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769 jffs2_complete_reservation(c);
770
771 d_instantiate(dentry, inode);
David Woodhousee72e6492010-06-03 08:09:12 +0100772 unlock_new_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700773 return 0;
David Woodhousef324e4c2010-06-03 08:03:39 +0100774
775 fail:
Al Viro41cce642010-06-08 13:24:56 -0400776 iget_failed(inode);
David Woodhousef324e4c2010-06-03 08:03:39 +0100777 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700778}
779
780static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
David Woodhouseef53cb02007-07-10 10:01:22 +0100781 struct inode *new_dir_i, struct dentry *new_dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782{
783 int ret;
784 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
785 struct jffs2_inode_info *victim_f = NULL;
786 uint8_t type;
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100787 uint32_t now;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000789 /* The VFS will check for us and prevent trying to rename a
Linus Torvalds1da177e2005-04-16 15:20:36 -0700790 * file over a directory and vice versa, but if it's a directory,
791 * the VFS can't check whether the victim is empty. The filesystem
792 * needs to do that for itself.
793 */
794 if (new_dentry->d_inode) {
795 victim_f = JFFS2_INODE_INFO(new_dentry->d_inode);
796 if (S_ISDIR(new_dentry->d_inode->i_mode)) {
797 struct jffs2_full_dirent *fd;
798
David Woodhouseced22072008-04-22 15:13:40 +0100799 mutex_lock(&victim_f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700800 for (fd = victim_f->dents; fd; fd = fd->next) {
801 if (fd->ino) {
David Woodhouseced22072008-04-22 15:13:40 +0100802 mutex_unlock(&victim_f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700803 return -ENOTEMPTY;
804 }
805 }
David Woodhouseced22072008-04-22 15:13:40 +0100806 mutex_unlock(&victim_f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700807 }
808 }
809
810 /* XXX: We probably ought to alloc enough space for
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000811 both nodes at the same time. Writing the new link,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700812 then getting -ENOSPC, is quite bad :)
813 */
814
815 /* Make a hard link */
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000816
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817 /* XXX: This is ugly */
818 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
819 if (!type) type = DT_REG;
820
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100821 now = get_seconds();
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000822 ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823 old_dentry->d_inode->i_ino, type,
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100824 new_dentry->d_name.name, new_dentry->d_name.len, now);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700825
826 if (ret)
827 return ret;
828
829 if (victim_f) {
830 /* There was a victim. Kill it off nicely */
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700831 drop_nlink(new_dentry->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700832 /* Don't oops if the victim was a dirent pointing to an
833 inode which didn't exist. */
834 if (victim_f->inocache) {
David Woodhouseced22072008-04-22 15:13:40 +0100835 mutex_lock(&victim_f->sem);
David Woodhouse27c72b02008-05-01 18:47:17 +0100836 if (S_ISDIR(new_dentry->d_inode->i_mode))
837 victim_f->inocache->pino_nlink = 0;
838 else
839 victim_f->inocache->pino_nlink--;
David Woodhouseced22072008-04-22 15:13:40 +0100840 mutex_unlock(&victim_f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700841 }
842 }
843
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000844 /* If it was a directory we moved, and there was no victim,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845 increase i_nlink on its new parent */
846 if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f)
Dave Hansend8c76e62006-09-30 23:29:04 -0700847 inc_nlink(new_dir_i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700848
849 /* Unlink the original */
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000850 ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100851 old_dentry->d_name.name, old_dentry->d_name.len, NULL, now);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852
853 /* We don't touch inode->i_nlink */
854
855 if (ret) {
856 /* Oh shit. We really ought to make a single node which can do both atomically */
857 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
David Woodhouseced22072008-04-22 15:13:40 +0100858 mutex_lock(&f->sem);
Dave Hansend8c76e62006-09-30 23:29:04 -0700859 inc_nlink(old_dentry->d_inode);
David Woodhouse27c72b02008-05-01 18:47:17 +0100860 if (f->inocache && !S_ISDIR(old_dentry->d_inode->i_mode))
861 f->inocache->pino_nlink++;
David Woodhouseced22072008-04-22 15:13:40 +0100862 mutex_unlock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700863
864 printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret);
865 /* Might as well let the VFS know */
866 d_instantiate(new_dentry, old_dentry->d_inode);
867 atomic_inc(&old_dentry->d_inode->i_count);
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100868 new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869 return ret;
870 }
871
872 if (S_ISDIR(old_dentry->d_inode->i_mode))
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700873 drop_nlink(old_dir_i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700874
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100875 new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now);
876
Linus Torvalds1da177e2005-04-16 15:20:36 -0700877 return 0;
878}
879