blob: 938556025d643349b5166e54b5cfc55ea4767dbe [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
Joe Perches5a528952012-02-15 15:56:45 -080013#define pr_fmt(fmt) KBUILD_MODNAME ": " fmt
14
Linus Torvalds1da177e2005-04-16 15:20:36 -070015#include <linux/kernel.h>
16#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070017#include <linux/fs.h>
18#include <linux/crc32.h>
19#include <linux/jffs2.h>
David Woodhousecbb9a562006-05-03 13:07:27 +010020#include "jffs2_fs_i.h"
21#include "jffs2_fs_sb.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070022#include <linux/time.h>
23#include "nodelist.h"
24
Al Viro0312fa72013-05-17 18:08:49 -040025static int jffs2_readdir (struct file *, struct dir_context *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070026
Al Viro4acdaf22011-07-26 01:42:34 -040027static int jffs2_create (struct inode *,struct dentry *,umode_t,
Al Viroebfc3b42012-06-10 18:05:36 -040028 bool);
Linus Torvalds1da177e2005-04-16 15:20:36 -070029static struct dentry *jffs2_lookup (struct inode *,struct dentry *,
Al Viro00cd8dd2012-06-10 17:13:09 -040030 unsigned int);
Linus Torvalds1da177e2005-04-16 15:20:36 -070031static int jffs2_link (struct dentry *,struct inode *,struct dentry *);
32static int jffs2_unlink (struct inode *,struct dentry *);
33static int jffs2_symlink (struct inode *,struct dentry *,const char *);
Al Viro18bb1db2011-07-26 01:41:39 -040034static int jffs2_mkdir (struct inode *,struct dentry *,umode_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -070035static int jffs2_rmdir (struct inode *,struct dentry *);
Al Viro1a67aaf2011-07-26 01:52:52 -040036static int jffs2_mknod (struct inode *,struct dentry *,umode_t,dev_t);
Linus Torvalds1da177e2005-04-16 15:20:36 -070037static int jffs2_rename (struct inode *, struct dentry *,
David Woodhouseef53cb02007-07-10 10:01:22 +010038 struct inode *, struct dentry *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070039
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -080040const struct file_operations jffs2_dir_operations =
Linus Torvalds1da177e2005-04-16 15:20:36 -070041{
42 .read = generic_read_dir,
Al Viro0312fa72013-05-17 18:08:49 -040043 .iterate = jffs2_readdir,
Stoyan Gaydarov05334002008-07-07 07:45:59 -050044 .unlocked_ioctl=jffs2_ioctl,
Christoph Hellwig3222a3e2008-09-03 21:53:01 +020045 .fsync = jffs2_fsync,
46 .llseek = generic_file_llseek,
Linus Torvalds1da177e2005-04-16 15:20:36 -070047};
48
49
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -080050const struct inode_operations jffs2_dir_inode_operations =
Linus Torvalds1da177e2005-04-16 15:20:36 -070051{
David Woodhouse265489f2005-07-06 13:13:13 +010052 .create = jffs2_create,
53 .lookup = jffs2_lookup,
Linus Torvalds1da177e2005-04-16 15:20:36 -070054 .link = jffs2_link,
55 .unlink = jffs2_unlink,
56 .symlink = jffs2_symlink,
57 .mkdir = jffs2_mkdir,
58 .rmdir = jffs2_rmdir,
59 .mknod = jffs2_mknod,
60 .rename = jffs2_rename,
Christoph Hellwig4e34e712011-07-23 17:37:31 +020061 .get_acl = jffs2_get_acl,
Christoph Hellwigf2963d42013-12-20 05:16:47 -080062 .set_acl = jffs2_set_acl,
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 .setattr = jffs2_setattr,
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +090064 .setxattr = jffs2_setxattr,
65 .getxattr = jffs2_getxattr,
66 .listxattr = jffs2_listxattr,
67 .removexattr = jffs2_removexattr
Linus Torvalds1da177e2005-04-16 15:20:36 -070068};
69
70/***********************************************************************/
71
72
73/* We keep the dirent list sorted in increasing order of name hash,
Thomas Gleixner182ec4e2005-11-07 11:16:07 +000074 and we use the same hash function as the dentries. Makes this
Linus Torvalds1da177e2005-04-16 15:20:36 -070075 nice and simple
76*/
77static struct dentry *jffs2_lookup(struct inode *dir_i, struct dentry *target,
Al Viro00cd8dd2012-06-10 17:13:09 -040078 unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -070079{
80 struct jffs2_inode_info *dir_f;
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 struct jffs2_full_dirent *fd = NULL, *fd_list;
82 uint32_t ino = 0;
83 struct inode *inode = NULL;
84
Joe Perches9c261b32012-02-15 15:56:43 -080085 jffs2_dbg(1, "jffs2_lookup()\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -070086
Richard Purdie373d5e72006-04-18 02:05:46 +010087 if (target->d_name.len > JFFS2_MAX_NAME_LEN)
88 return ERR_PTR(-ENAMETOOLONG);
89
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 dir_f = JFFS2_INODE_INFO(dir_i);
Linus Torvalds1da177e2005-04-16 15:20:36 -070091
David Woodhouseced22072008-04-22 15:13:40 +010092 mutex_lock(&dir_f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -070093
94 /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */
95 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 +000096 if (fd_list->nhash == target->d_name.hash &&
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 (!fd || fd_list->version > fd->version) &&
98 strlen(fd_list->name) == target->d_name.len &&
99 !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) {
100 fd = fd_list;
101 }
102 }
103 if (fd)
104 ino = fd->ino;
David Woodhouseced22072008-04-22 15:13:40 +0100105 mutex_unlock(&dir_f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106 if (ino) {
David Howells5451f792008-02-07 00:15:42 -0800107 inode = jffs2_iget(dir_i->i_sb, ino);
Al Viroa9049372011-07-08 21:20:11 -0400108 if (IS_ERR(inode))
Joe Perchesda320f02012-02-15 15:56:44 -0800109 pr_warn("iget() failed for ino #%u\n", ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110 }
111
David Woodhouse8966c5e2008-08-18 15:36:47 +0100112 return d_splice_alias(inode, target);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113}
114
115/***********************************************************************/
116
117
Al Viro0312fa72013-05-17 18:08:49 -0400118static int jffs2_readdir(struct file *file, struct dir_context *ctx)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119{
Al Viro0312fa72013-05-17 18:08:49 -0400120 struct inode *inode = file_inode(file);
121 struct jffs2_inode_info *f = JFFS2_INODE_INFO(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700122 struct jffs2_full_dirent *fd;
Al Viro0312fa72013-05-17 18:08:49 -0400123 unsigned long curofs = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124
Al Viro0312fa72013-05-17 18:08:49 -0400125 jffs2_dbg(1, "jffs2_readdir() for dir_i #%lu\n", inode->i_ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700126
Al Viro0312fa72013-05-17 18:08:49 -0400127 if (!dir_emit_dots(file, ctx))
128 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129
David Woodhouseced22072008-04-22 15:13:40 +0100130 mutex_lock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 for (fd = f->dents; fd; fd = fd->next) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 curofs++;
Al Viro0312fa72013-05-17 18:08:49 -0400133 /* First loop: curofs = 2; pos = 2 */
134 if (curofs < ctx->pos) {
Joe Perches9c261b32012-02-15 15:56:43 -0800135 jffs2_dbg(2, "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n",
Al Viro0312fa72013-05-17 18:08:49 -0400136 fd->name, fd->ino, fd->type, curofs, (unsigned long)ctx->pos);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 continue;
138 }
139 if (!fd->ino) {
Joe Perches9c261b32012-02-15 15:56:43 -0800140 jffs2_dbg(2, "Skipping deletion dirent \"%s\"\n",
141 fd->name);
Al Viro0312fa72013-05-17 18:08:49 -0400142 ctx->pos++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143 continue;
144 }
Joe Perches9c261b32012-02-15 15:56:43 -0800145 jffs2_dbg(2, "Dirent %ld: \"%s\", ino #%u, type %d\n",
Al Viro0312fa72013-05-17 18:08:49 -0400146 (unsigned long)ctx->pos, fd->name, fd->ino, fd->type);
147 if (!dir_emit(ctx, fd->name, strlen(fd->name), fd->ino, fd->type))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 break;
Al Viro0312fa72013-05-17 18:08:49 -0400149 ctx->pos++;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 }
David Woodhouseced22072008-04-22 15:13:40 +0100151 mutex_unlock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152 return 0;
153}
154
155/***********************************************************************/
156
157
Al Viro4acdaf22011-07-26 01:42:34 -0400158static int jffs2_create(struct inode *dir_i, struct dentry *dentry,
Al Viroebfc3b42012-06-10 18:05:36 -0400159 umode_t mode, bool excl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160{
161 struct jffs2_raw_inode *ri;
162 struct jffs2_inode_info *f, *dir_f;
163 struct jffs2_sb_info *c;
164 struct inode *inode;
165 int ret;
166
167 ri = jffs2_alloc_raw_inode();
168 if (!ri)
169 return -ENOMEM;
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000170
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 c = JFFS2_SB_INFO(dir_i->i_sb);
172
Joe Perches9c261b32012-02-15 15:56:43 -0800173 jffs2_dbg(1, "%s()\n", __func__);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174
KaiGai Koheicfc8dc62007-09-14 15:16:35 +0900175 inode = jffs2_new_inode(dir_i, mode, ri);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176
177 if (IS_ERR(inode)) {
Joe Perches9c261b32012-02-15 15:56:43 -0800178 jffs2_dbg(1, "jffs2_new_inode() failed\n");
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 jffs2_free_raw_inode(ri);
180 return PTR_ERR(inode);
181 }
182
183 inode->i_op = &jffs2_file_inode_operations;
184 inode->i_fop = &jffs2_file_operations;
185 inode->i_mapping->a_ops = &jffs2_file_address_operations;
186 inode->i_mapping->nrpages = 0;
187
188 f = JFFS2_INODE_INFO(inode);
189 dir_f = JFFS2_INODE_INFO(dir_i);
190
David Woodhouse590fe342008-05-01 15:53:28 +0100191 /* jffs2_do_create() will want to lock it, _after_ reserving
192 space and taking c-alloc_sem. If we keep it locked here,
193 lockdep gets unhappy (although it's a false positive;
194 nothing else will be looking at this inode yet so there's
195 no chance of AB-BA deadlock involving its f->sem). */
196 mutex_unlock(&f->sem);
197
Eric Paris2a7dba32011-02-01 11:05:39 -0500198 ret = jffs2_do_create(c, dir_f, f, ri, &dentry->d_name);
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900199 if (ret)
200 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201
202 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime));
203
204 jffs2_free_raw_inode(ri);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205
Joe Perches9c261b32012-02-15 15:56:43 -0800206 jffs2_dbg(1, "%s(): Created ino #%lu with mode %o, nlink %d(%d). nrpages %ld\n",
207 __func__, inode->i_ino, inode->i_mode, inode->i_nlink,
208 f->inocache->pino_nlink, inode->i_mapping->nrpages);
David Woodhousee72e6492010-06-03 08:09:12 +0100209
David Woodhousee72e6492010-06-03 08:09:12 +0100210 unlock_new_inode(inode);
Al Viro8fc37ec2012-07-19 09:18:15 +0400211 d_instantiate(dentry, inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 return 0;
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900213
214 fail:
Al Viro41cce642010-06-08 13:24:56 -0400215 iget_failed(inode);
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900216 jffs2_free_raw_inode(ri);
217 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218}
219
220/***********************************************************************/
221
222
223static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry)
224{
225 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
226 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
227 struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode);
228 int ret;
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100229 uint32_t now = get_seconds();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700230
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000231 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100232 dentry->d_name.len, dead_f, now);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 if (dead_f->inocache)
Miklos Szeredibfe86842011-10-28 14:13:29 +0200234 set_nlink(dentry->d_inode, dead_f->inocache->pino_nlink);
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100235 if (!ret)
236 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237 return ret;
238}
239/***********************************************************************/
240
241
242static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
243{
244 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb);
245 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
246 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
247 int ret;
248 uint8_t type;
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100249 uint32_t now;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250
251 /* Don't let people make hard links to bad inodes. */
252 if (!f->inocache)
253 return -EIO;
254
255 if (S_ISDIR(old_dentry->d_inode->i_mode))
256 return -EPERM;
257
258 /* XXX: This is ugly */
259 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
260 if (!type) type = DT_REG;
261
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100262 now = get_seconds();
263 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 -0700264
265 if (!ret) {
David Woodhouseced22072008-04-22 15:13:40 +0100266 mutex_lock(&f->sem);
Miklos Szeredibfe86842011-10-28 14:13:29 +0200267 set_nlink(old_dentry->d_inode, ++f->inocache->pino_nlink);
David Woodhouseced22072008-04-22 15:13:40 +0100268 mutex_unlock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 d_instantiate(dentry, old_dentry->d_inode);
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100270 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
Al Viro7de9c6ee2010-10-23 11:11:40 -0400271 ihold(old_dentry->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 }
273 return ret;
274}
275
276/***********************************************************************/
277
278static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target)
279{
280 struct jffs2_inode_info *f, *dir_f;
281 struct jffs2_sb_info *c;
282 struct inode *inode;
283 struct jffs2_raw_inode *ri;
284 struct jffs2_raw_dirent *rd;
285 struct jffs2_full_dnode *fn;
286 struct jffs2_full_dirent *fd;
287 int namelen;
David Woodhouse9fe48542006-05-23 00:38:06 +0100288 uint32_t alloclen;
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000289 int ret, targetlen = strlen(target);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290
291 /* FIXME: If you care. We'd need to use frags for the target
292 if it grows much more than this */
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000293 if (targetlen > 254)
Adrian Hunterbde86fe2008-08-14 11:57:45 +0300294 return -ENAMETOOLONG;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295
296 ri = jffs2_alloc_raw_inode();
297
298 if (!ri)
299 return -ENOMEM;
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000300
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301 c = JFFS2_SB_INFO(dir_i->i_sb);
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000302
303 /* Try to reserve enough space for both node and dirent.
304 * Just the node will do for now, though
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 */
306 namelen = dentry->d_name.len;
David Woodhouse9fe48542006-05-23 00:38:06 +0100307 ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen,
308 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309
310 if (ret) {
311 jffs2_free_raw_inode(ri);
312 return ret;
313 }
314
KaiGai Koheicfc8dc62007-09-14 15:16:35 +0900315 inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316
317 if (IS_ERR(inode)) {
318 jffs2_free_raw_inode(ri);
319 jffs2_complete_reservation(c);
320 return PTR_ERR(inode);
321 }
322
323 inode->i_op = &jffs2_symlink_inode_operations;
324
325 f = JFFS2_INODE_INFO(inode);
326
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000327 inode->i_size = targetlen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size);
329 ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size);
330 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
331
332 ri->compr = JFFS2_COMPR_NONE;
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000333 ri->data_crc = cpu_to_je32(crc32(0, target, targetlen));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000335
David Woodhouse9fe48542006-05-23 00:38:06 +0100336 fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337
338 jffs2_free_raw_inode(ri);
339
340 if (IS_ERR(fn)) {
341 /* Eeek. Wave bye bye */
David Woodhouseced22072008-04-22 15:13:40 +0100342 mutex_unlock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343 jffs2_complete_reservation(c);
David Woodhousef324e4c2010-06-03 08:03:39 +0100344 ret = PTR_ERR(fn);
345 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346 }
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000347
Artem B. Bityutskiy2b79adc2005-07-17 12:13:51 +0100348 /* We use f->target field to store the target path. */
Julia Lawall04aadf32010-10-17 21:56:15 +0200349 f->target = kmemdup(target, targetlen + 1, GFP_KERNEL);
Artem B. Bityutskiy2b79adc2005-07-17 12:13:51 +0100350 if (!f->target) {
Joe Perchesda320f02012-02-15 15:56:44 -0800351 pr_warn("Can't allocate %d bytes of memory\n", targetlen + 1);
David Woodhouseced22072008-04-22 15:13:40 +0100352 mutex_unlock(&f->sem);
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000353 jffs2_complete_reservation(c);
David Woodhousef324e4c2010-06-03 08:03:39 +0100354 ret = -ENOMEM;
355 goto fail;
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000356 }
357
Joe Perches9c261b32012-02-15 15:56:43 -0800358 jffs2_dbg(1, "%s(): symlink's target '%s' cached\n",
359 __func__, (char *)f->target);
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000360
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000361 /* No data here. Only a metadata node, which will be
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 obsoleted by the first data write
363 */
364 f->metadata = fn;
David Woodhouseced22072008-04-22 15:13:40 +0100365 mutex_unlock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700366
367 jffs2_complete_reservation(c);
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900368
Eric Paris2a7dba32011-02-01 11:05:39 -0500369 ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
David Woodhousef324e4c2010-06-03 08:03:39 +0100370 if (ret)
371 goto fail;
372
KaiGai Koheicfc8dc62007-09-14 15:16:35 +0900373 ret = jffs2_init_acl_post(inode);
David Woodhousef324e4c2010-06-03 08:03:39 +0100374 if (ret)
375 goto fail;
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900376
David Woodhouse9fe48542006-05-23 00:38:06 +0100377 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
378 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
David Woodhousef324e4c2010-06-03 08:03:39 +0100379 if (ret)
380 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381
382 rd = jffs2_alloc_raw_dirent();
383 if (!rd) {
384 /* Argh. Now we treat it like a normal delete */
385 jffs2_complete_reservation(c);
David Woodhousef324e4c2010-06-03 08:03:39 +0100386 ret = -ENOMEM;
387 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700388 }
389
390 dir_f = JFFS2_INODE_INFO(dir_i);
David Woodhouseced22072008-04-22 15:13:40 +0100391 mutex_lock(&dir_f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392
393 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
394 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
395 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
396 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
397
398 rd->pino = cpu_to_je32(dir_i->i_ino);
399 rd->version = cpu_to_je32(++dir_f->highest_version);
400 rd->ino = cpu_to_je32(inode->i_ino);
401 rd->mctime = cpu_to_je32(get_seconds());
402 rd->nsize = namelen;
403 rd->type = DT_LNK;
404 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
405 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
406
David Woodhouse9fe48542006-05-23 00:38:06 +0100407 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408
409 if (IS_ERR(fd)) {
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000410 /* dirent failed to write. Delete the inode normally
Linus Torvalds1da177e2005-04-16 15:20:36 -0700411 as if it were the final unlink() */
412 jffs2_complete_reservation(c);
413 jffs2_free_raw_dirent(rd);
David Woodhouseced22072008-04-22 15:13:40 +0100414 mutex_unlock(&dir_f->sem);
David Woodhousef324e4c2010-06-03 08:03:39 +0100415 ret = PTR_ERR(fd);
416 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700417 }
418
419 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
420
421 jffs2_free_raw_dirent(rd);
422
423 /* Link the fd into the inode's list, obsoleting an old
424 one if necessary. */
425 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
426
David Woodhouseced22072008-04-22 15:13:40 +0100427 mutex_unlock(&dir_f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700428 jffs2_complete_reservation(c);
429
David Woodhousee72e6492010-06-03 08:09:12 +0100430 unlock_new_inode(inode);
Al Viro8fc37ec2012-07-19 09:18:15 +0400431 d_instantiate(dentry, inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 return 0;
David Woodhousef324e4c2010-06-03 08:03:39 +0100433
434 fail:
Al Viro41cce642010-06-08 13:24:56 -0400435 iget_failed(inode);
David Woodhousef324e4c2010-06-03 08:03:39 +0100436 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700437}
438
439
Al Viro18bb1db2011-07-26 01:41:39 -0400440static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, umode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441{
442 struct jffs2_inode_info *f, *dir_f;
443 struct jffs2_sb_info *c;
444 struct inode *inode;
445 struct jffs2_raw_inode *ri;
446 struct jffs2_raw_dirent *rd;
447 struct jffs2_full_dnode *fn;
448 struct jffs2_full_dirent *fd;
449 int namelen;
David Woodhouse9fe48542006-05-23 00:38:06 +0100450 uint32_t alloclen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 int ret;
452
453 mode |= S_IFDIR;
454
455 ri = jffs2_alloc_raw_inode();
456 if (!ri)
457 return -ENOMEM;
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000458
Linus Torvalds1da177e2005-04-16 15:20:36 -0700459 c = JFFS2_SB_INFO(dir_i->i_sb);
460
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000461 /* Try to reserve enough space for both node and dirent.
462 * Just the node will do for now, though
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 */
464 namelen = dentry->d_name.len;
David Woodhouse9fe48542006-05-23 00:38:06 +0100465 ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL,
466 JFFS2_SUMMARY_INODE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700467
468 if (ret) {
469 jffs2_free_raw_inode(ri);
470 return ret;
471 }
472
KaiGai Koheicfc8dc62007-09-14 15:16:35 +0900473 inode = jffs2_new_inode(dir_i, mode, ri);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700474
475 if (IS_ERR(inode)) {
476 jffs2_free_raw_inode(ri);
477 jffs2_complete_reservation(c);
478 return PTR_ERR(inode);
479 }
480
481 inode->i_op = &jffs2_dir_inode_operations;
482 inode->i_fop = &jffs2_dir_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483
484 f = JFFS2_INODE_INFO(inode);
485
David Woodhouse27c72b02008-05-01 18:47:17 +0100486 /* Directories get nlink 2 at start */
Miklos Szeredibfe86842011-10-28 14:13:29 +0200487 set_nlink(inode, 2);
David Woodhouse27c72b02008-05-01 18:47:17 +0100488 /* but ic->pino_nlink is the parent ino# */
489 f->inocache->pino_nlink = dir_i->i_ino;
490
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491 ri->data_crc = cpu_to_je32(0);
492 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000493
David Woodhouse9fe48542006-05-23 00:38:06 +0100494 fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495
496 jffs2_free_raw_inode(ri);
497
498 if (IS_ERR(fn)) {
499 /* Eeek. Wave bye bye */
David Woodhouseced22072008-04-22 15:13:40 +0100500 mutex_unlock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 jffs2_complete_reservation(c);
David Woodhousef324e4c2010-06-03 08:03:39 +0100502 ret = PTR_ERR(fn);
503 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504 }
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000505 /* No data here. Only a metadata node, which will be
Linus Torvalds1da177e2005-04-16 15:20:36 -0700506 obsoleted by the first data write
507 */
508 f->metadata = fn;
David Woodhouseced22072008-04-22 15:13:40 +0100509 mutex_unlock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700510
511 jffs2_complete_reservation(c);
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900512
Eric Paris2a7dba32011-02-01 11:05:39 -0500513 ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
David Woodhousef324e4c2010-06-03 08:03:39 +0100514 if (ret)
515 goto fail;
516
KaiGai Koheicfc8dc62007-09-14 15:16:35 +0900517 ret = jffs2_init_acl_post(inode);
David Woodhousef324e4c2010-06-03 08:03:39 +0100518 if (ret)
519 goto fail;
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900520
David Woodhouse9fe48542006-05-23 00:38:06 +0100521 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
522 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
David Woodhousef324e4c2010-06-03 08:03:39 +0100523 if (ret)
524 goto fail;
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000525
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526 rd = jffs2_alloc_raw_dirent();
527 if (!rd) {
528 /* Argh. Now we treat it like a normal delete */
529 jffs2_complete_reservation(c);
David Woodhousef324e4c2010-06-03 08:03:39 +0100530 ret = -ENOMEM;
531 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 }
533
534 dir_f = JFFS2_INODE_INFO(dir_i);
David Woodhouseced22072008-04-22 15:13:40 +0100535 mutex_lock(&dir_f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536
537 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
538 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
539 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
540 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
541
542 rd->pino = cpu_to_je32(dir_i->i_ino);
543 rd->version = cpu_to_je32(++dir_f->highest_version);
544 rd->ino = cpu_to_je32(inode->i_ino);
545 rd->mctime = cpu_to_je32(get_seconds());
546 rd->nsize = namelen;
547 rd->type = DT_DIR;
548 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
549 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
550
David Woodhouse9fe48542006-05-23 00:38:06 +0100551 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000552
Linus Torvalds1da177e2005-04-16 15:20:36 -0700553 if (IS_ERR(fd)) {
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000554 /* dirent failed to write. Delete the inode normally
Linus Torvalds1da177e2005-04-16 15:20:36 -0700555 as if it were the final unlink() */
556 jffs2_complete_reservation(c);
557 jffs2_free_raw_dirent(rd);
David Woodhouseced22072008-04-22 15:13:40 +0100558 mutex_unlock(&dir_f->sem);
David Woodhousef324e4c2010-06-03 08:03:39 +0100559 ret = PTR_ERR(fd);
560 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700561 }
562
563 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
Dave Hansend8c76e62006-09-30 23:29:04 -0700564 inc_nlink(dir_i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700565
566 jffs2_free_raw_dirent(rd);
567
568 /* Link the fd into the inode's list, obsoleting an old
569 one if necessary. */
570 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
571
David Woodhouseced22072008-04-22 15:13:40 +0100572 mutex_unlock(&dir_f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 jffs2_complete_reservation(c);
574
David Woodhousee72e6492010-06-03 08:09:12 +0100575 unlock_new_inode(inode);
Al Viro8fc37ec2012-07-19 09:18:15 +0400576 d_instantiate(dentry, inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700577 return 0;
David Woodhousef324e4c2010-06-03 08:03:39 +0100578
579 fail:
Al Viro41cce642010-06-08 13:24:56 -0400580 iget_failed(inode);
David Woodhousef324e4c2010-06-03 08:03:39 +0100581 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582}
583
584static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry)
585{
David Woodhouse27c72b02008-05-01 18:47:17 +0100586 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
587 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700588 struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode);
589 struct jffs2_full_dirent *fd;
590 int ret;
David Woodhouse27c72b02008-05-01 18:47:17 +0100591 uint32_t now = get_seconds();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700592
593 for (fd = f->dents ; fd; fd = fd->next) {
594 if (fd->ino)
595 return -ENOTEMPTY;
596 }
David Woodhouse27c72b02008-05-01 18:47:17 +0100597
598 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
599 dentry->d_name.len, f, now);
600 if (!ret) {
601 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
602 clear_nlink(dentry->d_inode);
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700603 drop_nlink(dir_i);
David Woodhouse27c72b02008-05-01 18:47:17 +0100604 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605 return ret;
606}
607
Al Viro1a67aaf2011-07-26 01:52:52 -0400608static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, umode_t mode, dev_t rdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700609{
610 struct jffs2_inode_info *f, *dir_f;
611 struct jffs2_sb_info *c;
612 struct inode *inode;
613 struct jffs2_raw_inode *ri;
614 struct jffs2_raw_dirent *rd;
615 struct jffs2_full_dnode *fn;
616 struct jffs2_full_dirent *fd;
617 int namelen;
David Woodhouseaef9ab42006-05-19 00:28:49 +0100618 union jffs2_device_node dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619 int devlen = 0;
David Woodhouse9fe48542006-05-23 00:38:06 +0100620 uint32_t alloclen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700621 int ret;
622
David Woodhouseaef9ab42006-05-19 00:28:49 +0100623 if (!new_valid_dev(rdev))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700624 return -EINVAL;
625
626 ri = jffs2_alloc_raw_inode();
627 if (!ri)
628 return -ENOMEM;
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000629
Linus Torvalds1da177e2005-04-16 15:20:36 -0700630 c = JFFS2_SB_INFO(dir_i->i_sb);
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000631
David Woodhouseaef9ab42006-05-19 00:28:49 +0100632 if (S_ISBLK(mode) || S_ISCHR(mode))
633 devlen = jffs2_encode_dev(&dev, rdev);
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000634
635 /* Try to reserve enough space for both node and dirent.
636 * Just the node will do for now, though
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637 */
638 namelen = dentry->d_name.len;
David Woodhouse9fe48542006-05-23 00:38:06 +0100639 ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen,
David Woodhouseaef9ab42006-05-19 00:28:49 +0100640 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641
642 if (ret) {
643 jffs2_free_raw_inode(ri);
644 return ret;
645 }
646
KaiGai Koheicfc8dc62007-09-14 15:16:35 +0900647 inode = jffs2_new_inode(dir_i, mode, ri);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700648
649 if (IS_ERR(inode)) {
650 jffs2_free_raw_inode(ri);
651 jffs2_complete_reservation(c);
652 return PTR_ERR(inode);
653 }
654 inode->i_op = &jffs2_file_inode_operations;
655 init_special_inode(inode, inode->i_mode, rdev);
656
657 f = JFFS2_INODE_INFO(inode);
658
659 ri->dsize = ri->csize = cpu_to_je32(devlen);
660 ri->totlen = cpu_to_je32(sizeof(*ri) + devlen);
661 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
662
663 ri->compr = JFFS2_COMPR_NONE;
664 ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen));
665 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000666
David Woodhouse9fe48542006-05-23 00:38:06 +0100667 fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700668
669 jffs2_free_raw_inode(ri);
670
671 if (IS_ERR(fn)) {
672 /* Eeek. Wave bye bye */
David Woodhouseced22072008-04-22 15:13:40 +0100673 mutex_unlock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700674 jffs2_complete_reservation(c);
David Woodhousef324e4c2010-06-03 08:03:39 +0100675 ret = PTR_ERR(fn);
676 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700677 }
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000678 /* No data here. Only a metadata node, which will be
Linus Torvalds1da177e2005-04-16 15:20:36 -0700679 obsoleted by the first data write
680 */
681 f->metadata = fn;
David Woodhouseced22072008-04-22 15:13:40 +0100682 mutex_unlock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700683
684 jffs2_complete_reservation(c);
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900685
Eric Paris2a7dba32011-02-01 11:05:39 -0500686 ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
David Woodhousef324e4c2010-06-03 08:03:39 +0100687 if (ret)
688 goto fail;
689
KaiGai Koheicfc8dc62007-09-14 15:16:35 +0900690 ret = jffs2_init_acl_post(inode);
David Woodhousef324e4c2010-06-03 08:03:39 +0100691 if (ret)
692 goto fail;
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900693
David Woodhouse9fe48542006-05-23 00:38:06 +0100694 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
695 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
David Woodhousef324e4c2010-06-03 08:03:39 +0100696 if (ret)
697 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700698
699 rd = jffs2_alloc_raw_dirent();
700 if (!rd) {
701 /* Argh. Now we treat it like a normal delete */
702 jffs2_complete_reservation(c);
David Woodhousef324e4c2010-06-03 08:03:39 +0100703 ret = -ENOMEM;
704 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700705 }
706
707 dir_f = JFFS2_INODE_INFO(dir_i);
David Woodhouseced22072008-04-22 15:13:40 +0100708 mutex_lock(&dir_f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700709
710 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
711 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
712 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
713 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
714
715 rd->pino = cpu_to_je32(dir_i->i_ino);
716 rd->version = cpu_to_je32(++dir_f->highest_version);
717 rd->ino = cpu_to_je32(inode->i_ino);
718 rd->mctime = cpu_to_je32(get_seconds());
719 rd->nsize = namelen;
720
721 /* XXX: This is ugly. */
722 rd->type = (mode & S_IFMT) >> 12;
723
724 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
725 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
726
David Woodhouse9fe48542006-05-23 00:38:06 +0100727 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000728
Linus Torvalds1da177e2005-04-16 15:20:36 -0700729 if (IS_ERR(fd)) {
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000730 /* dirent failed to write. Delete the inode normally
Linus Torvalds1da177e2005-04-16 15:20:36 -0700731 as if it were the final unlink() */
732 jffs2_complete_reservation(c);
733 jffs2_free_raw_dirent(rd);
David Woodhouseced22072008-04-22 15:13:40 +0100734 mutex_unlock(&dir_f->sem);
David Woodhousef324e4c2010-06-03 08:03:39 +0100735 ret = PTR_ERR(fd);
736 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700737 }
738
739 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
740
741 jffs2_free_raw_dirent(rd);
742
743 /* Link the fd into the inode's list, obsoleting an old
744 one if necessary. */
745 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
746
David Woodhouseced22072008-04-22 15:13:40 +0100747 mutex_unlock(&dir_f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700748 jffs2_complete_reservation(c);
749
David Woodhousee72e6492010-06-03 08:09:12 +0100750 unlock_new_inode(inode);
Al Viro8fc37ec2012-07-19 09:18:15 +0400751 d_instantiate(dentry, inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700752 return 0;
David Woodhousef324e4c2010-06-03 08:03:39 +0100753
754 fail:
Al Viro41cce642010-06-08 13:24:56 -0400755 iget_failed(inode);
David Woodhousef324e4c2010-06-03 08:03:39 +0100756 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700757}
758
759static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
David Woodhouseef53cb02007-07-10 10:01:22 +0100760 struct inode *new_dir_i, struct dentry *new_dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761{
762 int ret;
763 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
764 struct jffs2_inode_info *victim_f = NULL;
765 uint8_t type;
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100766 uint32_t now;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700767
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000768 /* The VFS will check for us and prevent trying to rename a
Linus Torvalds1da177e2005-04-16 15:20:36 -0700769 * file over a directory and vice versa, but if it's a directory,
770 * the VFS can't check whether the victim is empty. The filesystem
771 * needs to do that for itself.
772 */
773 if (new_dentry->d_inode) {
774 victim_f = JFFS2_INODE_INFO(new_dentry->d_inode);
775 if (S_ISDIR(new_dentry->d_inode->i_mode)) {
776 struct jffs2_full_dirent *fd;
777
David Woodhouseced22072008-04-22 15:13:40 +0100778 mutex_lock(&victim_f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700779 for (fd = victim_f->dents; fd; fd = fd->next) {
780 if (fd->ino) {
David Woodhouseced22072008-04-22 15:13:40 +0100781 mutex_unlock(&victim_f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782 return -ENOTEMPTY;
783 }
784 }
David Woodhouseced22072008-04-22 15:13:40 +0100785 mutex_unlock(&victim_f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700786 }
787 }
788
789 /* XXX: We probably ought to alloc enough space for
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000790 both nodes at the same time. Writing the new link,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700791 then getting -ENOSPC, is quite bad :)
792 */
793
794 /* Make a hard link */
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000795
Linus Torvalds1da177e2005-04-16 15:20:36 -0700796 /* XXX: This is ugly */
797 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
798 if (!type) type = DT_REG;
799
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100800 now = get_seconds();
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000801 ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700802 old_dentry->d_inode->i_ino, type,
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100803 new_dentry->d_name.name, new_dentry->d_name.len, now);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804
805 if (ret)
806 return ret;
807
808 if (victim_f) {
809 /* There was a victim. Kill it off nicely */
Al Viro22ba7472011-07-21 15:57:47 -0400810 if (S_ISDIR(new_dentry->d_inode->i_mode))
811 clear_nlink(new_dentry->d_inode);
812 else
813 drop_nlink(new_dentry->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700814 /* Don't oops if the victim was a dirent pointing to an
815 inode which didn't exist. */
816 if (victim_f->inocache) {
David Woodhouseced22072008-04-22 15:13:40 +0100817 mutex_lock(&victim_f->sem);
David Woodhouse27c72b02008-05-01 18:47:17 +0100818 if (S_ISDIR(new_dentry->d_inode->i_mode))
819 victim_f->inocache->pino_nlink = 0;
820 else
821 victim_f->inocache->pino_nlink--;
David Woodhouseced22072008-04-22 15:13:40 +0100822 mutex_unlock(&victim_f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700823 }
824 }
825
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000826 /* If it was a directory we moved, and there was no victim,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827 increase i_nlink on its new parent */
828 if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f)
Dave Hansend8c76e62006-09-30 23:29:04 -0700829 inc_nlink(new_dir_i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700830
831 /* Unlink the original */
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000832 ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100833 old_dentry->d_name.name, old_dentry->d_name.len, NULL, now);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700834
835 /* We don't touch inode->i_nlink */
836
837 if (ret) {
838 /* Oh shit. We really ought to make a single node which can do both atomically */
839 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
David Woodhouseced22072008-04-22 15:13:40 +0100840 mutex_lock(&f->sem);
Dave Hansend8c76e62006-09-30 23:29:04 -0700841 inc_nlink(old_dentry->d_inode);
David Woodhouse27c72b02008-05-01 18:47:17 +0100842 if (f->inocache && !S_ISDIR(old_dentry->d_inode->i_mode))
843 f->inocache->pino_nlink++;
David Woodhouseced22072008-04-22 15:13:40 +0100844 mutex_unlock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700845
Joe Perchesda320f02012-02-15 15:56:44 -0800846 pr_notice("%s(): Link succeeded, unlink failed (err %d). You now have a hard link\n",
847 __func__, ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700848 /* Might as well let the VFS know */
849 d_instantiate(new_dentry, old_dentry->d_inode);
Al Viro7de9c6ee2010-10-23 11:11:40 -0400850 ihold(old_dentry->d_inode);
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100851 new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700852 return ret;
853 }
854
855 if (S_ISDIR(old_dentry->d_inode->i_mode))
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700856 drop_nlink(old_dir_i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700857
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100858 new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now);
859
Linus Torvalds1da177e2005-04-16 15:20:36 -0700860 return 0;
861}
862