blob: 82faddd1f321b74e8efd4f11fe07449e409d7bbc [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
Eric Paris2a7dba32011-02-01 11:05:39 -0500218 ret = jffs2_do_create(c, dir_f, f, ri, &dentry->d_name);
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900219 if (ret)
220 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221
222 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime));
223
224 jffs2_free_raw_inode(ri);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225
226 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 +0100227 inode->i_ino, inode->i_mode, inode->i_nlink,
228 f->inocache->pino_nlink, inode->i_mapping->nrpages));
David Woodhousee72e6492010-06-03 08:09:12 +0100229
230 d_instantiate(dentry, inode);
231 unlock_new_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 return 0;
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900233
234 fail:
Al Viro41cce642010-06-08 13:24:56 -0400235 iget_failed(inode);
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900236 jffs2_free_raw_inode(ri);
237 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238}
239
240/***********************************************************************/
241
242
243static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry)
244{
245 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
246 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
247 struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode);
248 int ret;
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100249 uint32_t now = get_seconds();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000251 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100252 dentry->d_name.len, dead_f, now);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253 if (dead_f->inocache)
David Woodhouse27c72b02008-05-01 18:47:17 +0100254 dentry->d_inode->i_nlink = dead_f->inocache->pino_nlink;
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100255 if (!ret)
256 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 return ret;
258}
259/***********************************************************************/
260
261
262static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
263{
264 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb);
265 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
266 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
267 int ret;
268 uint8_t type;
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100269 uint32_t now;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270
271 /* Don't let people make hard links to bad inodes. */
272 if (!f->inocache)
273 return -EIO;
274
275 if (S_ISDIR(old_dentry->d_inode->i_mode))
276 return -EPERM;
277
278 /* XXX: This is ugly */
279 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
280 if (!type) type = DT_REG;
281
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100282 now = get_seconds();
283 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 -0700284
285 if (!ret) {
David Woodhouseced22072008-04-22 15:13:40 +0100286 mutex_lock(&f->sem);
David Woodhouse27c72b02008-05-01 18:47:17 +0100287 old_dentry->d_inode->i_nlink = ++f->inocache->pino_nlink;
David Woodhouseced22072008-04-22 15:13:40 +0100288 mutex_unlock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 d_instantiate(dentry, old_dentry->d_inode);
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100290 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
Al Viro7de9c6ee2010-10-23 11:11:40 -0400291 ihold(old_dentry->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 }
293 return ret;
294}
295
296/***********************************************************************/
297
298static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target)
299{
300 struct jffs2_inode_info *f, *dir_f;
301 struct jffs2_sb_info *c;
302 struct inode *inode;
303 struct jffs2_raw_inode *ri;
304 struct jffs2_raw_dirent *rd;
305 struct jffs2_full_dnode *fn;
306 struct jffs2_full_dirent *fd;
307 int namelen;
David Woodhouse9fe48542006-05-23 00:38:06 +0100308 uint32_t alloclen;
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000309 int ret, targetlen = strlen(target);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310
311 /* FIXME: If you care. We'd need to use frags for the target
312 if it grows much more than this */
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000313 if (targetlen > 254)
Adrian Hunterbde86fe2008-08-14 11:57:45 +0300314 return -ENAMETOOLONG;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315
316 ri = jffs2_alloc_raw_inode();
317
318 if (!ri)
319 return -ENOMEM;
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000320
Linus Torvalds1da177e2005-04-16 15:20:36 -0700321 c = JFFS2_SB_INFO(dir_i->i_sb);
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000322
323 /* Try to reserve enough space for both node and dirent.
324 * Just the node will do for now, though
Linus Torvalds1da177e2005-04-16 15:20:36 -0700325 */
326 namelen = dentry->d_name.len;
David Woodhouse9fe48542006-05-23 00:38:06 +0100327 ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen,
328 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329
330 if (ret) {
331 jffs2_free_raw_inode(ri);
332 return ret;
333 }
334
KaiGai Koheicfc8dc62007-09-14 15:16:35 +0900335 inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336
337 if (IS_ERR(inode)) {
338 jffs2_free_raw_inode(ri);
339 jffs2_complete_reservation(c);
340 return PTR_ERR(inode);
341 }
342
343 inode->i_op = &jffs2_symlink_inode_operations;
344
345 f = JFFS2_INODE_INFO(inode);
346
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000347 inode->i_size = targetlen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size);
349 ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size);
350 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
351
352 ri->compr = JFFS2_COMPR_NONE;
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000353 ri->data_crc = cpu_to_je32(crc32(0, target, targetlen));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000355
David Woodhouse9fe48542006-05-23 00:38:06 +0100356 fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357
358 jffs2_free_raw_inode(ri);
359
360 if (IS_ERR(fn)) {
361 /* Eeek. Wave bye bye */
David Woodhouseced22072008-04-22 15:13:40 +0100362 mutex_unlock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 jffs2_complete_reservation(c);
David Woodhousef324e4c2010-06-03 08:03:39 +0100364 ret = PTR_ERR(fn);
365 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366 }
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000367
Artem B. Bityutskiy2b79adc2005-07-17 12:13:51 +0100368 /* We use f->target field to store the target path. */
Julia Lawall04aadf32010-10-17 21:56:15 +0200369 f->target = kmemdup(target, targetlen + 1, GFP_KERNEL);
Artem B. Bityutskiy2b79adc2005-07-17 12:13:51 +0100370 if (!f->target) {
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000371 printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1);
David Woodhouseced22072008-04-22 15:13:40 +0100372 mutex_unlock(&f->sem);
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000373 jffs2_complete_reservation(c);
David Woodhousef324e4c2010-06-03 08:03:39 +0100374 ret = -ENOMEM;
375 goto fail;
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000376 }
377
Artem B. Bityutskiy2b79adc2005-07-17 12:13:51 +0100378 D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->target));
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000379
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000380 /* No data here. Only a metadata node, which will be
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 obsoleted by the first data write
382 */
383 f->metadata = fn;
David Woodhouseced22072008-04-22 15:13:40 +0100384 mutex_unlock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385
386 jffs2_complete_reservation(c);
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900387
Eric Paris2a7dba32011-02-01 11:05:39 -0500388 ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
David Woodhousef324e4c2010-06-03 08:03:39 +0100389 if (ret)
390 goto fail;
391
KaiGai Koheicfc8dc62007-09-14 15:16:35 +0900392 ret = jffs2_init_acl_post(inode);
David Woodhousef324e4c2010-06-03 08:03:39 +0100393 if (ret)
394 goto fail;
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900395
David Woodhouse9fe48542006-05-23 00:38:06 +0100396 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
397 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
David Woodhousef324e4c2010-06-03 08:03:39 +0100398 if (ret)
399 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700400
401 rd = jffs2_alloc_raw_dirent();
402 if (!rd) {
403 /* Argh. Now we treat it like a normal delete */
404 jffs2_complete_reservation(c);
David Woodhousef324e4c2010-06-03 08:03:39 +0100405 ret = -ENOMEM;
406 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 }
408
409 dir_f = JFFS2_INODE_INFO(dir_i);
David Woodhouseced22072008-04-22 15:13:40 +0100410 mutex_lock(&dir_f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411
412 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
413 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
414 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
415 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
416
417 rd->pino = cpu_to_je32(dir_i->i_ino);
418 rd->version = cpu_to_je32(++dir_f->highest_version);
419 rd->ino = cpu_to_je32(inode->i_ino);
420 rd->mctime = cpu_to_je32(get_seconds());
421 rd->nsize = namelen;
422 rd->type = DT_LNK;
423 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
424 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
425
David Woodhouse9fe48542006-05-23 00:38:06 +0100426 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700427
428 if (IS_ERR(fd)) {
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000429 /* dirent failed to write. Delete the inode normally
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 as if it were the final unlink() */
431 jffs2_complete_reservation(c);
432 jffs2_free_raw_dirent(rd);
David Woodhouseced22072008-04-22 15:13:40 +0100433 mutex_unlock(&dir_f->sem);
David Woodhousef324e4c2010-06-03 08:03:39 +0100434 ret = PTR_ERR(fd);
435 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700436 }
437
438 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
439
440 jffs2_free_raw_dirent(rd);
441
442 /* Link the fd into the inode's list, obsoleting an old
443 one if necessary. */
444 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
445
David Woodhouseced22072008-04-22 15:13:40 +0100446 mutex_unlock(&dir_f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700447 jffs2_complete_reservation(c);
448
449 d_instantiate(dentry, inode);
David Woodhousee72e6492010-06-03 08:09:12 +0100450 unlock_new_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 return 0;
David Woodhousef324e4c2010-06-03 08:03:39 +0100452
453 fail:
Al Viro41cce642010-06-08 13:24:56 -0400454 iget_failed(inode);
David Woodhousef324e4c2010-06-03 08:03:39 +0100455 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700456}
457
458
459static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode)
460{
461 struct jffs2_inode_info *f, *dir_f;
462 struct jffs2_sb_info *c;
463 struct inode *inode;
464 struct jffs2_raw_inode *ri;
465 struct jffs2_raw_dirent *rd;
466 struct jffs2_full_dnode *fn;
467 struct jffs2_full_dirent *fd;
468 int namelen;
David Woodhouse9fe48542006-05-23 00:38:06 +0100469 uint32_t alloclen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700470 int ret;
471
472 mode |= S_IFDIR;
473
474 ri = jffs2_alloc_raw_inode();
475 if (!ri)
476 return -ENOMEM;
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000477
Linus Torvalds1da177e2005-04-16 15:20:36 -0700478 c = JFFS2_SB_INFO(dir_i->i_sb);
479
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000480 /* Try to reserve enough space for both node and dirent.
481 * Just the node will do for now, though
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 */
483 namelen = dentry->d_name.len;
David Woodhouse9fe48542006-05-23 00:38:06 +0100484 ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL,
485 JFFS2_SUMMARY_INODE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486
487 if (ret) {
488 jffs2_free_raw_inode(ri);
489 return ret;
490 }
491
KaiGai Koheicfc8dc62007-09-14 15:16:35 +0900492 inode = jffs2_new_inode(dir_i, mode, ri);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700493
494 if (IS_ERR(inode)) {
495 jffs2_free_raw_inode(ri);
496 jffs2_complete_reservation(c);
497 return PTR_ERR(inode);
498 }
499
500 inode->i_op = &jffs2_dir_inode_operations;
501 inode->i_fop = &jffs2_dir_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502
503 f = JFFS2_INODE_INFO(inode);
504
David Woodhouse27c72b02008-05-01 18:47:17 +0100505 /* Directories get nlink 2 at start */
506 inode->i_nlink = 2;
507 /* but ic->pino_nlink is the parent ino# */
508 f->inocache->pino_nlink = dir_i->i_ino;
509
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510 ri->data_crc = cpu_to_je32(0);
511 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000512
David Woodhouse9fe48542006-05-23 00:38:06 +0100513 fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514
515 jffs2_free_raw_inode(ri);
516
517 if (IS_ERR(fn)) {
518 /* Eeek. Wave bye bye */
David Woodhouseced22072008-04-22 15:13:40 +0100519 mutex_unlock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 jffs2_complete_reservation(c);
David Woodhousef324e4c2010-06-03 08:03:39 +0100521 ret = PTR_ERR(fn);
522 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523 }
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000524 /* No data here. Only a metadata node, which will be
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525 obsoleted by the first data write
526 */
527 f->metadata = fn;
David Woodhouseced22072008-04-22 15:13:40 +0100528 mutex_unlock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700529
530 jffs2_complete_reservation(c);
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900531
Eric Paris2a7dba32011-02-01 11:05:39 -0500532 ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
David Woodhousef324e4c2010-06-03 08:03:39 +0100533 if (ret)
534 goto fail;
535
KaiGai Koheicfc8dc62007-09-14 15:16:35 +0900536 ret = jffs2_init_acl_post(inode);
David Woodhousef324e4c2010-06-03 08:03:39 +0100537 if (ret)
538 goto fail;
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900539
David Woodhouse9fe48542006-05-23 00:38:06 +0100540 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
541 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
David Woodhousef324e4c2010-06-03 08:03:39 +0100542 if (ret)
543 goto fail;
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000544
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545 rd = jffs2_alloc_raw_dirent();
546 if (!rd) {
547 /* Argh. Now we treat it like a normal delete */
548 jffs2_complete_reservation(c);
David Woodhousef324e4c2010-06-03 08:03:39 +0100549 ret = -ENOMEM;
550 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700551 }
552
553 dir_f = JFFS2_INODE_INFO(dir_i);
David Woodhouseced22072008-04-22 15:13:40 +0100554 mutex_lock(&dir_f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555
556 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
557 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
558 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
559 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
560
561 rd->pino = cpu_to_je32(dir_i->i_ino);
562 rd->version = cpu_to_je32(++dir_f->highest_version);
563 rd->ino = cpu_to_je32(inode->i_ino);
564 rd->mctime = cpu_to_je32(get_seconds());
565 rd->nsize = namelen;
566 rd->type = DT_DIR;
567 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
568 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
569
David Woodhouse9fe48542006-05-23 00:38:06 +0100570 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000571
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572 if (IS_ERR(fd)) {
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000573 /* dirent failed to write. Delete the inode normally
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 as if it were the final unlink() */
575 jffs2_complete_reservation(c);
576 jffs2_free_raw_dirent(rd);
David Woodhouseced22072008-04-22 15:13:40 +0100577 mutex_unlock(&dir_f->sem);
David Woodhousef324e4c2010-06-03 08:03:39 +0100578 ret = PTR_ERR(fd);
579 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580 }
581
582 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
Dave Hansend8c76e62006-09-30 23:29:04 -0700583 inc_nlink(dir_i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700584
585 jffs2_free_raw_dirent(rd);
586
587 /* Link the fd into the inode's list, obsoleting an old
588 one if necessary. */
589 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
590
David Woodhouseced22072008-04-22 15:13:40 +0100591 mutex_unlock(&dir_f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592 jffs2_complete_reservation(c);
593
594 d_instantiate(dentry, inode);
David Woodhousee72e6492010-06-03 08:09:12 +0100595 unlock_new_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700596 return 0;
David Woodhousef324e4c2010-06-03 08:03:39 +0100597
598 fail:
Al Viro41cce642010-06-08 13:24:56 -0400599 iget_failed(inode);
David Woodhousef324e4c2010-06-03 08:03:39 +0100600 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601}
602
603static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry)
604{
David Woodhouse27c72b02008-05-01 18:47:17 +0100605 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
606 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607 struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode);
608 struct jffs2_full_dirent *fd;
609 int ret;
David Woodhouse27c72b02008-05-01 18:47:17 +0100610 uint32_t now = get_seconds();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700611
612 for (fd = f->dents ; fd; fd = fd->next) {
613 if (fd->ino)
614 return -ENOTEMPTY;
615 }
David Woodhouse27c72b02008-05-01 18:47:17 +0100616
617 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
618 dentry->d_name.len, f, now);
619 if (!ret) {
620 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
621 clear_nlink(dentry->d_inode);
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700622 drop_nlink(dir_i);
David Woodhouse27c72b02008-05-01 18:47:17 +0100623 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 return ret;
625}
626
David Woodhouse265489f2005-07-06 13:13:13 +0100627static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, dev_t rdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700628{
629 struct jffs2_inode_info *f, *dir_f;
630 struct jffs2_sb_info *c;
631 struct inode *inode;
632 struct jffs2_raw_inode *ri;
633 struct jffs2_raw_dirent *rd;
634 struct jffs2_full_dnode *fn;
635 struct jffs2_full_dirent *fd;
636 int namelen;
David Woodhouseaef9ab42006-05-19 00:28:49 +0100637 union jffs2_device_node dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638 int devlen = 0;
David Woodhouse9fe48542006-05-23 00:38:06 +0100639 uint32_t alloclen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700640 int ret;
641
David Woodhouseaef9ab42006-05-19 00:28:49 +0100642 if (!new_valid_dev(rdev))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643 return -EINVAL;
644
645 ri = jffs2_alloc_raw_inode();
646 if (!ri)
647 return -ENOMEM;
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000648
Linus Torvalds1da177e2005-04-16 15:20:36 -0700649 c = JFFS2_SB_INFO(dir_i->i_sb);
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000650
David Woodhouseaef9ab42006-05-19 00:28:49 +0100651 if (S_ISBLK(mode) || S_ISCHR(mode))
652 devlen = jffs2_encode_dev(&dev, rdev);
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000653
654 /* Try to reserve enough space for both node and dirent.
655 * Just the node will do for now, though
Linus Torvalds1da177e2005-04-16 15:20:36 -0700656 */
657 namelen = dentry->d_name.len;
David Woodhouse9fe48542006-05-23 00:38:06 +0100658 ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen,
David Woodhouseaef9ab42006-05-19 00:28:49 +0100659 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700660
661 if (ret) {
662 jffs2_free_raw_inode(ri);
663 return ret;
664 }
665
KaiGai Koheicfc8dc62007-09-14 15:16:35 +0900666 inode = jffs2_new_inode(dir_i, mode, ri);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700667
668 if (IS_ERR(inode)) {
669 jffs2_free_raw_inode(ri);
670 jffs2_complete_reservation(c);
671 return PTR_ERR(inode);
672 }
673 inode->i_op = &jffs2_file_inode_operations;
674 init_special_inode(inode, inode->i_mode, rdev);
675
676 f = JFFS2_INODE_INFO(inode);
677
678 ri->dsize = ri->csize = cpu_to_je32(devlen);
679 ri->totlen = cpu_to_je32(sizeof(*ri) + devlen);
680 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
681
682 ri->compr = JFFS2_COMPR_NONE;
683 ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen));
684 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000685
David Woodhouse9fe48542006-05-23 00:38:06 +0100686 fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687
688 jffs2_free_raw_inode(ri);
689
690 if (IS_ERR(fn)) {
691 /* Eeek. Wave bye bye */
David Woodhouseced22072008-04-22 15:13:40 +0100692 mutex_unlock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700693 jffs2_complete_reservation(c);
David Woodhousef324e4c2010-06-03 08:03:39 +0100694 ret = PTR_ERR(fn);
695 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696 }
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000697 /* No data here. Only a metadata node, which will be
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698 obsoleted by the first data write
699 */
700 f->metadata = fn;
David Woodhouseced22072008-04-22 15:13:40 +0100701 mutex_unlock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700702
703 jffs2_complete_reservation(c);
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900704
Eric Paris2a7dba32011-02-01 11:05:39 -0500705 ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
David Woodhousef324e4c2010-06-03 08:03:39 +0100706 if (ret)
707 goto fail;
708
KaiGai Koheicfc8dc62007-09-14 15:16:35 +0900709 ret = jffs2_init_acl_post(inode);
David Woodhousef324e4c2010-06-03 08:03:39 +0100710 if (ret)
711 goto fail;
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900712
David Woodhouse9fe48542006-05-23 00:38:06 +0100713 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
714 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
David Woodhousef324e4c2010-06-03 08:03:39 +0100715 if (ret)
716 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700717
718 rd = jffs2_alloc_raw_dirent();
719 if (!rd) {
720 /* Argh. Now we treat it like a normal delete */
721 jffs2_complete_reservation(c);
David Woodhousef324e4c2010-06-03 08:03:39 +0100722 ret = -ENOMEM;
723 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700724 }
725
726 dir_f = JFFS2_INODE_INFO(dir_i);
David Woodhouseced22072008-04-22 15:13:40 +0100727 mutex_lock(&dir_f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700728
729 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
730 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
731 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
732 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
733
734 rd->pino = cpu_to_je32(dir_i->i_ino);
735 rd->version = cpu_to_je32(++dir_f->highest_version);
736 rd->ino = cpu_to_je32(inode->i_ino);
737 rd->mctime = cpu_to_je32(get_seconds());
738 rd->nsize = namelen;
739
740 /* XXX: This is ugly. */
741 rd->type = (mode & S_IFMT) >> 12;
742
743 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
744 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
745
David Woodhouse9fe48542006-05-23 00:38:06 +0100746 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000747
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748 if (IS_ERR(fd)) {
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000749 /* dirent failed to write. Delete the inode normally
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750 as if it were the final unlink() */
751 jffs2_complete_reservation(c);
752 jffs2_free_raw_dirent(rd);
David Woodhouseced22072008-04-22 15:13:40 +0100753 mutex_unlock(&dir_f->sem);
David Woodhousef324e4c2010-06-03 08:03:39 +0100754 ret = PTR_ERR(fd);
755 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700756 }
757
758 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
759
760 jffs2_free_raw_dirent(rd);
761
762 /* Link the fd into the inode's list, obsoleting an old
763 one if necessary. */
764 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
765
David Woodhouseced22072008-04-22 15:13:40 +0100766 mutex_unlock(&dir_f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767 jffs2_complete_reservation(c);
768
769 d_instantiate(dentry, inode);
David Woodhousee72e6492010-06-03 08:09:12 +0100770 unlock_new_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700771 return 0;
David Woodhousef324e4c2010-06-03 08:03:39 +0100772
773 fail:
Al Viro41cce642010-06-08 13:24:56 -0400774 iget_failed(inode);
David Woodhousef324e4c2010-06-03 08:03:39 +0100775 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700776}
777
778static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
David Woodhouseef53cb02007-07-10 10:01:22 +0100779 struct inode *new_dir_i, struct dentry *new_dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780{
781 int ret;
782 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
783 struct jffs2_inode_info *victim_f = NULL;
784 uint8_t type;
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100785 uint32_t now;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000787 /* The VFS will check for us and prevent trying to rename a
Linus Torvalds1da177e2005-04-16 15:20:36 -0700788 * file over a directory and vice versa, but if it's a directory,
789 * the VFS can't check whether the victim is empty. The filesystem
790 * needs to do that for itself.
791 */
792 if (new_dentry->d_inode) {
793 victim_f = JFFS2_INODE_INFO(new_dentry->d_inode);
794 if (S_ISDIR(new_dentry->d_inode->i_mode)) {
795 struct jffs2_full_dirent *fd;
796
David Woodhouseced22072008-04-22 15:13:40 +0100797 mutex_lock(&victim_f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700798 for (fd = victim_f->dents; fd; fd = fd->next) {
799 if (fd->ino) {
David Woodhouseced22072008-04-22 15:13:40 +0100800 mutex_unlock(&victim_f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700801 return -ENOTEMPTY;
802 }
803 }
David Woodhouseced22072008-04-22 15:13:40 +0100804 mutex_unlock(&victim_f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700805 }
806 }
807
808 /* XXX: We probably ought to alloc enough space for
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000809 both nodes at the same time. Writing the new link,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700810 then getting -ENOSPC, is quite bad :)
811 */
812
813 /* Make a hard link */
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000814
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815 /* XXX: This is ugly */
816 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
817 if (!type) type = DT_REG;
818
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100819 now = get_seconds();
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000820 ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700821 old_dentry->d_inode->i_ino, type,
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100822 new_dentry->d_name.name, new_dentry->d_name.len, now);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823
824 if (ret)
825 return ret;
826
827 if (victim_f) {
828 /* There was a victim. Kill it off nicely */
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700829 drop_nlink(new_dentry->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830 /* Don't oops if the victim was a dirent pointing to an
831 inode which didn't exist. */
832 if (victim_f->inocache) {
David Woodhouseced22072008-04-22 15:13:40 +0100833 mutex_lock(&victim_f->sem);
David Woodhouse27c72b02008-05-01 18:47:17 +0100834 if (S_ISDIR(new_dentry->d_inode->i_mode))
835 victim_f->inocache->pino_nlink = 0;
836 else
837 victim_f->inocache->pino_nlink--;
David Woodhouseced22072008-04-22 15:13:40 +0100838 mutex_unlock(&victim_f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700839 }
840 }
841
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000842 /* If it was a directory we moved, and there was no victim,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843 increase i_nlink on its new parent */
844 if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f)
Dave Hansend8c76e62006-09-30 23:29:04 -0700845 inc_nlink(new_dir_i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700846
847 /* Unlink the original */
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000848 ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100849 old_dentry->d_name.name, old_dentry->d_name.len, NULL, now);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700850
851 /* We don't touch inode->i_nlink */
852
853 if (ret) {
854 /* Oh shit. We really ought to make a single node which can do both atomically */
855 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
David Woodhouseced22072008-04-22 15:13:40 +0100856 mutex_lock(&f->sem);
Dave Hansend8c76e62006-09-30 23:29:04 -0700857 inc_nlink(old_dentry->d_inode);
David Woodhouse27c72b02008-05-01 18:47:17 +0100858 if (f->inocache && !S_ISDIR(old_dentry->d_inode->i_mode))
859 f->inocache->pino_nlink++;
David Woodhouseced22072008-04-22 15:13:40 +0100860 mutex_unlock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700861
862 printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret);
863 /* Might as well let the VFS know */
864 d_instantiate(new_dentry, old_dentry->d_inode);
Al Viro7de9c6ee2010-10-23 11:11:40 -0400865 ihold(old_dentry->d_inode);
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100866 new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700867 return ret;
868 }
869
870 if (S_ISDIR(old_dentry->d_inode->i_mode))
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700871 drop_nlink(old_dir_i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100873 new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now);
874
Linus Torvalds1da177e2005-04-16 15:20:36 -0700875 return 0;
876}
877