blob: 9659b7c00468064cdc9e51be4d68d06229fc85eb [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,
Christoph Hellwig4e34e712011-07-23 17:37:31 +020059 .get_acl = jffs2_get_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;
Linus Torvalds1da177e2005-04-16 15:20:36 -070078 struct jffs2_full_dirent *fd = NULL, *fd_list;
79 uint32_t ino = 0;
80 struct inode *inode = NULL;
81
82 D1(printk(KERN_DEBUG "jffs2_lookup()\n"));
83
Richard Purdie373d5e72006-04-18 02:05:46 +010084 if (target->d_name.len > JFFS2_MAX_NAME_LEN)
85 return ERR_PTR(-ENAMETOOLONG);
86
Linus Torvalds1da177e2005-04-16 15:20:36 -070087 dir_f = JFFS2_INODE_INFO(dir_i);
Linus Torvalds1da177e2005-04-16 15:20:36 -070088
David Woodhouseced22072008-04-22 15:13:40 +010089 mutex_lock(&dir_f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -070090
91 /* NB: The 2.2 backport will need to explicitly check for '.' and '..' here */
92 for (fd_list = dir_f->dents; fd_list && fd_list->nhash <= target->d_name.hash; fd_list = fd_list->next) {
Thomas Gleixner182ec4e2005-11-07 11:16:07 +000093 if (fd_list->nhash == target->d_name.hash &&
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 (!fd || fd_list->version > fd->version) &&
95 strlen(fd_list->name) == target->d_name.len &&
96 !strncmp(fd_list->name, target->d_name.name, target->d_name.len)) {
97 fd = fd_list;
98 }
99 }
100 if (fd)
101 ino = fd->ino;
David Woodhouseced22072008-04-22 15:13:40 +0100102 mutex_unlock(&dir_f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 if (ino) {
David Howells5451f792008-02-07 00:15:42 -0800104 inode = jffs2_iget(dir_i->i_sb, ino);
Al Viroa9049372011-07-08 21:20:11 -0400105 if (IS_ERR(inode))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106 printk(KERN_WARNING "iget() failed for ino #%u\n", ino);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 }
108
David Woodhouse8966c5e2008-08-18 15:36:47 +0100109 return d_splice_alias(inode, target);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110}
111
112/***********************************************************************/
113
114
115static int jffs2_readdir(struct file *filp, void *dirent, filldir_t filldir)
116{
117 struct jffs2_inode_info *f;
Josef Sipekec2e2032006-12-08 02:37:16 -0800118 struct inode *inode = filp->f_path.dentry->d_inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 struct jffs2_full_dirent *fd;
120 unsigned long offset, curofs;
121
Josef Sipekec2e2032006-12-08 02:37:16 -0800122 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 -0700123
124 f = JFFS2_INODE_INFO(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125
126 offset = filp->f_pos;
127
128 if (offset == 0) {
129 D1(printk(KERN_DEBUG "Dirent 0: \".\", ino #%lu\n", inode->i_ino));
130 if (filldir(dirent, ".", 1, 0, inode->i_ino, DT_DIR) < 0)
131 goto out;
132 offset++;
133 }
134 if (offset == 1) {
Josef Sipekec2e2032006-12-08 02:37:16 -0800135 unsigned long pino = parent_ino(filp->f_path.dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 D1(printk(KERN_DEBUG "Dirent 1: \"..\", ino #%lu\n", pino));
137 if (filldir(dirent, "..", 2, 1, pino, DT_DIR) < 0)
138 goto out;
139 offset++;
140 }
141
142 curofs=1;
David Woodhouseced22072008-04-22 15:13:40 +0100143 mutex_lock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 for (fd = f->dents; fd; fd = fd->next) {
145
146 curofs++;
147 /* First loop: curofs = 2; offset = 2 */
148 if (curofs < offset) {
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000149 D2(printk(KERN_DEBUG "Skipping dirent: \"%s\", ino #%u, type %d, because curofs %ld < offset %ld\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150 fd->name, fd->ino, fd->type, curofs, offset));
151 continue;
152 }
153 if (!fd->ino) {
154 D2(printk(KERN_DEBUG "Skipping deletion dirent \"%s\"\n", fd->name));
155 offset++;
156 continue;
157 }
158 D2(printk(KERN_DEBUG "Dirent %ld: \"%s\", ino #%u, type %d\n", offset, fd->name, fd->ino, fd->type));
159 if (filldir(dirent, fd->name, strlen(fd->name), offset, fd->ino, fd->type) < 0)
160 break;
161 offset++;
162 }
David Woodhouseced22072008-04-22 15:13:40 +0100163 mutex_unlock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164 out:
165 filp->f_pos = offset;
166 return 0;
167}
168
169/***********************************************************************/
170
171
172static int jffs2_create(struct inode *dir_i, struct dentry *dentry, int mode,
173 struct nameidata *nd)
174{
175 struct jffs2_raw_inode *ri;
176 struct jffs2_inode_info *f, *dir_f;
177 struct jffs2_sb_info *c;
178 struct inode *inode;
179 int ret;
180
181 ri = jffs2_alloc_raw_inode();
182 if (!ri)
183 return -ENOMEM;
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000184
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185 c = JFFS2_SB_INFO(dir_i->i_sb);
186
187 D1(printk(KERN_DEBUG "jffs2_create()\n"));
188
KaiGai Koheicfc8dc62007-09-14 15:16:35 +0900189 inode = jffs2_new_inode(dir_i, mode, ri);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190
191 if (IS_ERR(inode)) {
192 D1(printk(KERN_DEBUG "jffs2_new_inode() failed\n"));
193 jffs2_free_raw_inode(ri);
194 return PTR_ERR(inode);
195 }
196
197 inode->i_op = &jffs2_file_inode_operations;
198 inode->i_fop = &jffs2_file_operations;
199 inode->i_mapping->a_ops = &jffs2_file_address_operations;
200 inode->i_mapping->nrpages = 0;
201
202 f = JFFS2_INODE_INFO(inode);
203 dir_f = JFFS2_INODE_INFO(dir_i);
204
David Woodhouse590fe342008-05-01 15:53:28 +0100205 /* jffs2_do_create() will want to lock it, _after_ reserving
206 space and taking c-alloc_sem. If we keep it locked here,
207 lockdep gets unhappy (although it's a false positive;
208 nothing else will be looking at this inode yet so there's
209 no chance of AB-BA deadlock involving its f->sem). */
210 mutex_unlock(&f->sem);
211
Eric Paris2a7dba32011-02-01 11:05:39 -0500212 ret = jffs2_do_create(c, dir_f, f, ri, &dentry->d_name);
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900213 if (ret)
214 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215
216 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(ri->ctime));
217
218 jffs2_free_raw_inode(ri);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219
220 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 +0100221 inode->i_ino, inode->i_mode, inode->i_nlink,
222 f->inocache->pino_nlink, inode->i_mapping->nrpages));
David Woodhousee72e6492010-06-03 08:09:12 +0100223
224 d_instantiate(dentry, inode);
225 unlock_new_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 return 0;
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900227
228 fail:
Al Viro41cce642010-06-08 13:24:56 -0400229 iget_failed(inode);
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900230 jffs2_free_raw_inode(ri);
231 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232}
233
234/***********************************************************************/
235
236
237static int jffs2_unlink(struct inode *dir_i, struct dentry *dentry)
238{
239 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
240 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
241 struct jffs2_inode_info *dead_f = JFFS2_INODE_INFO(dentry->d_inode);
242 int ret;
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100243 uint32_t now = get_seconds();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000245 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100246 dentry->d_name.len, dead_f, now);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 if (dead_f->inocache)
David Woodhouse27c72b02008-05-01 18:47:17 +0100248 dentry->d_inode->i_nlink = dead_f->inocache->pino_nlink;
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100249 if (!ret)
250 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 return ret;
252}
253/***********************************************************************/
254
255
256static int jffs2_link (struct dentry *old_dentry, struct inode *dir_i, struct dentry *dentry)
257{
258 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dentry->d_inode->i_sb);
259 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
260 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
261 int ret;
262 uint8_t type;
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100263 uint32_t now;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264
265 /* Don't let people make hard links to bad inodes. */
266 if (!f->inocache)
267 return -EIO;
268
269 if (S_ISDIR(old_dentry->d_inode->i_mode))
270 return -EPERM;
271
272 /* XXX: This is ugly */
273 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
274 if (!type) type = DT_REG;
275
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100276 now = get_seconds();
277 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 -0700278
279 if (!ret) {
David Woodhouseced22072008-04-22 15:13:40 +0100280 mutex_lock(&f->sem);
David Woodhouse27c72b02008-05-01 18:47:17 +0100281 old_dentry->d_inode->i_nlink = ++f->inocache->pino_nlink;
David Woodhouseced22072008-04-22 15:13:40 +0100282 mutex_unlock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283 d_instantiate(dentry, old_dentry->d_inode);
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100284 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
Al Viro7de9c6ee2010-10-23 11:11:40 -0400285 ihold(old_dentry->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 }
287 return ret;
288}
289
290/***********************************************************************/
291
292static int jffs2_symlink (struct inode *dir_i, struct dentry *dentry, const char *target)
293{
294 struct jffs2_inode_info *f, *dir_f;
295 struct jffs2_sb_info *c;
296 struct inode *inode;
297 struct jffs2_raw_inode *ri;
298 struct jffs2_raw_dirent *rd;
299 struct jffs2_full_dnode *fn;
300 struct jffs2_full_dirent *fd;
301 int namelen;
David Woodhouse9fe48542006-05-23 00:38:06 +0100302 uint32_t alloclen;
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000303 int ret, targetlen = strlen(target);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304
305 /* FIXME: If you care. We'd need to use frags for the target
306 if it grows much more than this */
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000307 if (targetlen > 254)
Adrian Hunterbde86fe2008-08-14 11:57:45 +0300308 return -ENAMETOOLONG;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309
310 ri = jffs2_alloc_raw_inode();
311
312 if (!ri)
313 return -ENOMEM;
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000314
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315 c = JFFS2_SB_INFO(dir_i->i_sb);
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000316
317 /* Try to reserve enough space for both node and dirent.
318 * Just the node will do for now, though
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319 */
320 namelen = dentry->d_name.len;
David Woodhouse9fe48542006-05-23 00:38:06 +0100321 ret = jffs2_reserve_space(c, sizeof(*ri) + targetlen, &alloclen,
322 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323
324 if (ret) {
325 jffs2_free_raw_inode(ri);
326 return ret;
327 }
328
KaiGai Koheicfc8dc62007-09-14 15:16:35 +0900329 inode = jffs2_new_inode(dir_i, S_IFLNK | S_IRWXUGO, ri);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330
331 if (IS_ERR(inode)) {
332 jffs2_free_raw_inode(ri);
333 jffs2_complete_reservation(c);
334 return PTR_ERR(inode);
335 }
336
337 inode->i_op = &jffs2_symlink_inode_operations;
338
339 f = JFFS2_INODE_INFO(inode);
340
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000341 inode->i_size = targetlen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700342 ri->isize = ri->dsize = ri->csize = cpu_to_je32(inode->i_size);
343 ri->totlen = cpu_to_je32(sizeof(*ri) + inode->i_size);
344 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
345
346 ri->compr = JFFS2_COMPR_NONE;
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000347 ri->data_crc = cpu_to_je32(crc32(0, target, targetlen));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000349
David Woodhouse9fe48542006-05-23 00:38:06 +0100350 fn = jffs2_write_dnode(c, f, ri, target, targetlen, ALLOC_NORMAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351
352 jffs2_free_raw_inode(ri);
353
354 if (IS_ERR(fn)) {
355 /* Eeek. Wave bye bye */
David Woodhouseced22072008-04-22 15:13:40 +0100356 mutex_unlock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 jffs2_complete_reservation(c);
David Woodhousef324e4c2010-06-03 08:03:39 +0100358 ret = PTR_ERR(fn);
359 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 }
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000361
Artem B. Bityutskiy2b79adc2005-07-17 12:13:51 +0100362 /* We use f->target field to store the target path. */
Julia Lawall04aadf32010-10-17 21:56:15 +0200363 f->target = kmemdup(target, targetlen + 1, GFP_KERNEL);
Artem B. Bityutskiy2b79adc2005-07-17 12:13:51 +0100364 if (!f->target) {
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000365 printk(KERN_WARNING "Can't allocate %d bytes of memory\n", targetlen + 1);
David Woodhouseced22072008-04-22 15:13:40 +0100366 mutex_unlock(&f->sem);
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000367 jffs2_complete_reservation(c);
David Woodhousef324e4c2010-06-03 08:03:39 +0100368 ret = -ENOMEM;
369 goto fail;
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000370 }
371
Artem B. Bityutskiy2b79adc2005-07-17 12:13:51 +0100372 D1(printk(KERN_DEBUG "jffs2_symlink: symlink's target '%s' cached\n", (char *)f->target));
Artem B. Bityuckiy32f1a952005-03-01 10:50:52 +0000373
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000374 /* No data here. Only a metadata node, which will be
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 obsoleted by the first data write
376 */
377 f->metadata = fn;
David Woodhouseced22072008-04-22 15:13:40 +0100378 mutex_unlock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700379
380 jffs2_complete_reservation(c);
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900381
Eric Paris2a7dba32011-02-01 11:05:39 -0500382 ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
David Woodhousef324e4c2010-06-03 08:03:39 +0100383 if (ret)
384 goto fail;
385
KaiGai Koheicfc8dc62007-09-14 15:16:35 +0900386 ret = jffs2_init_acl_post(inode);
David Woodhousef324e4c2010-06-03 08:03:39 +0100387 if (ret)
388 goto fail;
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900389
David Woodhouse9fe48542006-05-23 00:38:06 +0100390 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
391 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
David Woodhousef324e4c2010-06-03 08:03:39 +0100392 if (ret)
393 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700394
395 rd = jffs2_alloc_raw_dirent();
396 if (!rd) {
397 /* Argh. Now we treat it like a normal delete */
398 jffs2_complete_reservation(c);
David Woodhousef324e4c2010-06-03 08:03:39 +0100399 ret = -ENOMEM;
400 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700401 }
402
403 dir_f = JFFS2_INODE_INFO(dir_i);
David Woodhouseced22072008-04-22 15:13:40 +0100404 mutex_lock(&dir_f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700405
406 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
407 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
408 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
409 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
410
411 rd->pino = cpu_to_je32(dir_i->i_ino);
412 rd->version = cpu_to_je32(++dir_f->highest_version);
413 rd->ino = cpu_to_je32(inode->i_ino);
414 rd->mctime = cpu_to_je32(get_seconds());
415 rd->nsize = namelen;
416 rd->type = DT_LNK;
417 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
418 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
419
David Woodhouse9fe48542006-05-23 00:38:06 +0100420 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421
422 if (IS_ERR(fd)) {
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000423 /* dirent failed to write. Delete the inode normally
Linus Torvalds1da177e2005-04-16 15:20:36 -0700424 as if it were the final unlink() */
425 jffs2_complete_reservation(c);
426 jffs2_free_raw_dirent(rd);
David Woodhouseced22072008-04-22 15:13:40 +0100427 mutex_unlock(&dir_f->sem);
David Woodhousef324e4c2010-06-03 08:03:39 +0100428 ret = PTR_ERR(fd);
429 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 }
431
432 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
433
434 jffs2_free_raw_dirent(rd);
435
436 /* Link the fd into the inode's list, obsoleting an old
437 one if necessary. */
438 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
439
David Woodhouseced22072008-04-22 15:13:40 +0100440 mutex_unlock(&dir_f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700441 jffs2_complete_reservation(c);
442
443 d_instantiate(dentry, inode);
David Woodhousee72e6492010-06-03 08:09:12 +0100444 unlock_new_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445 return 0;
David Woodhousef324e4c2010-06-03 08:03:39 +0100446
447 fail:
Al Viro41cce642010-06-08 13:24:56 -0400448 iget_failed(inode);
David Woodhousef324e4c2010-06-03 08:03:39 +0100449 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450}
451
452
453static int jffs2_mkdir (struct inode *dir_i, struct dentry *dentry, int mode)
454{
455 struct jffs2_inode_info *f, *dir_f;
456 struct jffs2_sb_info *c;
457 struct inode *inode;
458 struct jffs2_raw_inode *ri;
459 struct jffs2_raw_dirent *rd;
460 struct jffs2_full_dnode *fn;
461 struct jffs2_full_dirent *fd;
462 int namelen;
David Woodhouse9fe48542006-05-23 00:38:06 +0100463 uint32_t alloclen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 int ret;
465
466 mode |= S_IFDIR;
467
468 ri = jffs2_alloc_raw_inode();
469 if (!ri)
470 return -ENOMEM;
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000471
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472 c = JFFS2_SB_INFO(dir_i->i_sb);
473
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000474 /* Try to reserve enough space for both node and dirent.
475 * Just the node will do for now, though
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 */
477 namelen = dentry->d_name.len;
David Woodhouse9fe48542006-05-23 00:38:06 +0100478 ret = jffs2_reserve_space(c, sizeof(*ri), &alloclen, ALLOC_NORMAL,
479 JFFS2_SUMMARY_INODE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700480
481 if (ret) {
482 jffs2_free_raw_inode(ri);
483 return ret;
484 }
485
KaiGai Koheicfc8dc62007-09-14 15:16:35 +0900486 inode = jffs2_new_inode(dir_i, mode, ri);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487
488 if (IS_ERR(inode)) {
489 jffs2_free_raw_inode(ri);
490 jffs2_complete_reservation(c);
491 return PTR_ERR(inode);
492 }
493
494 inode->i_op = &jffs2_dir_inode_operations;
495 inode->i_fop = &jffs2_dir_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496
497 f = JFFS2_INODE_INFO(inode);
498
David Woodhouse27c72b02008-05-01 18:47:17 +0100499 /* Directories get nlink 2 at start */
500 inode->i_nlink = 2;
501 /* but ic->pino_nlink is the parent ino# */
502 f->inocache->pino_nlink = dir_i->i_ino;
503
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504 ri->data_crc = cpu_to_je32(0);
505 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000506
David Woodhouse9fe48542006-05-23 00:38:06 +0100507 fn = jffs2_write_dnode(c, f, ri, NULL, 0, ALLOC_NORMAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700508
509 jffs2_free_raw_inode(ri);
510
511 if (IS_ERR(fn)) {
512 /* Eeek. Wave bye bye */
David Woodhouseced22072008-04-22 15:13:40 +0100513 mutex_unlock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700514 jffs2_complete_reservation(c);
David Woodhousef324e4c2010-06-03 08:03:39 +0100515 ret = PTR_ERR(fn);
516 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700517 }
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000518 /* No data here. Only a metadata node, which will be
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519 obsoleted by the first data write
520 */
521 f->metadata = fn;
David Woodhouseced22072008-04-22 15:13:40 +0100522 mutex_unlock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523
524 jffs2_complete_reservation(c);
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900525
Eric Paris2a7dba32011-02-01 11:05:39 -0500526 ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
David Woodhousef324e4c2010-06-03 08:03:39 +0100527 if (ret)
528 goto fail;
529
KaiGai Koheicfc8dc62007-09-14 15:16:35 +0900530 ret = jffs2_init_acl_post(inode);
David Woodhousef324e4c2010-06-03 08:03:39 +0100531 if (ret)
532 goto fail;
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900533
David Woodhouse9fe48542006-05-23 00:38:06 +0100534 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
535 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
David Woodhousef324e4c2010-06-03 08:03:39 +0100536 if (ret)
537 goto fail;
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000538
Linus Torvalds1da177e2005-04-16 15:20:36 -0700539 rd = jffs2_alloc_raw_dirent();
540 if (!rd) {
541 /* Argh. Now we treat it like a normal delete */
542 jffs2_complete_reservation(c);
David Woodhousef324e4c2010-06-03 08:03:39 +0100543 ret = -ENOMEM;
544 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545 }
546
547 dir_f = JFFS2_INODE_INFO(dir_i);
David Woodhouseced22072008-04-22 15:13:40 +0100548 mutex_lock(&dir_f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549
550 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
551 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
552 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
553 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
554
555 rd->pino = cpu_to_je32(dir_i->i_ino);
556 rd->version = cpu_to_je32(++dir_f->highest_version);
557 rd->ino = cpu_to_je32(inode->i_ino);
558 rd->mctime = cpu_to_je32(get_seconds());
559 rd->nsize = namelen;
560 rd->type = DT_DIR;
561 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
562 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
563
David Woodhouse9fe48542006-05-23 00:38:06 +0100564 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000565
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566 if (IS_ERR(fd)) {
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000567 /* dirent failed to write. Delete the inode normally
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568 as if it were the final unlink() */
569 jffs2_complete_reservation(c);
570 jffs2_free_raw_dirent(rd);
David Woodhouseced22072008-04-22 15:13:40 +0100571 mutex_unlock(&dir_f->sem);
David Woodhousef324e4c2010-06-03 08:03:39 +0100572 ret = PTR_ERR(fd);
573 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 }
575
576 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
Dave Hansend8c76e62006-09-30 23:29:04 -0700577 inc_nlink(dir_i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700578
579 jffs2_free_raw_dirent(rd);
580
581 /* Link the fd into the inode's list, obsoleting an old
582 one if necessary. */
583 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
584
David Woodhouseced22072008-04-22 15:13:40 +0100585 mutex_unlock(&dir_f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700586 jffs2_complete_reservation(c);
587
588 d_instantiate(dentry, inode);
David Woodhousee72e6492010-06-03 08:09:12 +0100589 unlock_new_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700590 return 0;
David Woodhousef324e4c2010-06-03 08:03:39 +0100591
592 fail:
Al Viro41cce642010-06-08 13:24:56 -0400593 iget_failed(inode);
David Woodhousef324e4c2010-06-03 08:03:39 +0100594 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700595}
596
597static int jffs2_rmdir (struct inode *dir_i, struct dentry *dentry)
598{
David Woodhouse27c72b02008-05-01 18:47:17 +0100599 struct jffs2_sb_info *c = JFFS2_SB_INFO(dir_i->i_sb);
600 struct jffs2_inode_info *dir_f = JFFS2_INODE_INFO(dir_i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700601 struct jffs2_inode_info *f = JFFS2_INODE_INFO(dentry->d_inode);
602 struct jffs2_full_dirent *fd;
603 int ret;
David Woodhouse27c72b02008-05-01 18:47:17 +0100604 uint32_t now = get_seconds();
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605
606 for (fd = f->dents ; fd; fd = fd->next) {
607 if (fd->ino)
608 return -ENOTEMPTY;
609 }
David Woodhouse27c72b02008-05-01 18:47:17 +0100610
611 ret = jffs2_do_unlink(c, dir_f, dentry->d_name.name,
612 dentry->d_name.len, f, now);
613 if (!ret) {
614 dir_i->i_mtime = dir_i->i_ctime = ITIME(now);
615 clear_nlink(dentry->d_inode);
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700616 drop_nlink(dir_i);
David Woodhouse27c72b02008-05-01 18:47:17 +0100617 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618 return ret;
619}
620
David Woodhouse265489f2005-07-06 13:13:13 +0100621static int jffs2_mknod (struct inode *dir_i, struct dentry *dentry, int mode, dev_t rdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700622{
623 struct jffs2_inode_info *f, *dir_f;
624 struct jffs2_sb_info *c;
625 struct inode *inode;
626 struct jffs2_raw_inode *ri;
627 struct jffs2_raw_dirent *rd;
628 struct jffs2_full_dnode *fn;
629 struct jffs2_full_dirent *fd;
630 int namelen;
David Woodhouseaef9ab42006-05-19 00:28:49 +0100631 union jffs2_device_node dev;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700632 int devlen = 0;
David Woodhouse9fe48542006-05-23 00:38:06 +0100633 uint32_t alloclen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700634 int ret;
635
David Woodhouseaef9ab42006-05-19 00:28:49 +0100636 if (!new_valid_dev(rdev))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637 return -EINVAL;
638
639 ri = jffs2_alloc_raw_inode();
640 if (!ri)
641 return -ENOMEM;
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000642
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643 c = JFFS2_SB_INFO(dir_i->i_sb);
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000644
David Woodhouseaef9ab42006-05-19 00:28:49 +0100645 if (S_ISBLK(mode) || S_ISCHR(mode))
646 devlen = jffs2_encode_dev(&dev, rdev);
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000647
648 /* Try to reserve enough space for both node and dirent.
649 * Just the node will do for now, though
Linus Torvalds1da177e2005-04-16 15:20:36 -0700650 */
651 namelen = dentry->d_name.len;
David Woodhouse9fe48542006-05-23 00:38:06 +0100652 ret = jffs2_reserve_space(c, sizeof(*ri) + devlen, &alloclen,
David Woodhouseaef9ab42006-05-19 00:28:49 +0100653 ALLOC_NORMAL, JFFS2_SUMMARY_INODE_SIZE);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700654
655 if (ret) {
656 jffs2_free_raw_inode(ri);
657 return ret;
658 }
659
KaiGai Koheicfc8dc62007-09-14 15:16:35 +0900660 inode = jffs2_new_inode(dir_i, mode, ri);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700661
662 if (IS_ERR(inode)) {
663 jffs2_free_raw_inode(ri);
664 jffs2_complete_reservation(c);
665 return PTR_ERR(inode);
666 }
667 inode->i_op = &jffs2_file_inode_operations;
668 init_special_inode(inode, inode->i_mode, rdev);
669
670 f = JFFS2_INODE_INFO(inode);
671
672 ri->dsize = ri->csize = cpu_to_je32(devlen);
673 ri->totlen = cpu_to_je32(sizeof(*ri) + devlen);
674 ri->hdr_crc = cpu_to_je32(crc32(0, ri, sizeof(struct jffs2_unknown_node)-4));
675
676 ri->compr = JFFS2_COMPR_NONE;
677 ri->data_crc = cpu_to_je32(crc32(0, &dev, devlen));
678 ri->node_crc = cpu_to_je32(crc32(0, ri, sizeof(*ri)-8));
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000679
David Woodhouse9fe48542006-05-23 00:38:06 +0100680 fn = jffs2_write_dnode(c, f, ri, (char *)&dev, devlen, ALLOC_NORMAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700681
682 jffs2_free_raw_inode(ri);
683
684 if (IS_ERR(fn)) {
685 /* Eeek. Wave bye bye */
David Woodhouseced22072008-04-22 15:13:40 +0100686 mutex_unlock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700687 jffs2_complete_reservation(c);
David Woodhousef324e4c2010-06-03 08:03:39 +0100688 ret = PTR_ERR(fn);
689 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700690 }
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000691 /* No data here. Only a metadata node, which will be
Linus Torvalds1da177e2005-04-16 15:20:36 -0700692 obsoleted by the first data write
693 */
694 f->metadata = fn;
David Woodhouseced22072008-04-22 15:13:40 +0100695 mutex_unlock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700696
697 jffs2_complete_reservation(c);
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900698
Eric Paris2a7dba32011-02-01 11:05:39 -0500699 ret = jffs2_init_security(inode, dir_i, &dentry->d_name);
David Woodhousef324e4c2010-06-03 08:03:39 +0100700 if (ret)
701 goto fail;
702
KaiGai Koheicfc8dc62007-09-14 15:16:35 +0900703 ret = jffs2_init_acl_post(inode);
David Woodhousef324e4c2010-06-03 08:03:39 +0100704 if (ret)
705 goto fail;
KaiGai Koheiaa98d7c2006-05-13 15:09:47 +0900706
David Woodhouse9fe48542006-05-23 00:38:06 +0100707 ret = jffs2_reserve_space(c, sizeof(*rd)+namelen, &alloclen,
708 ALLOC_NORMAL, JFFS2_SUMMARY_DIRENT_SIZE(namelen));
David Woodhousef324e4c2010-06-03 08:03:39 +0100709 if (ret)
710 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700711
712 rd = jffs2_alloc_raw_dirent();
713 if (!rd) {
714 /* Argh. Now we treat it like a normal delete */
715 jffs2_complete_reservation(c);
David Woodhousef324e4c2010-06-03 08:03:39 +0100716 ret = -ENOMEM;
717 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700718 }
719
720 dir_f = JFFS2_INODE_INFO(dir_i);
David Woodhouseced22072008-04-22 15:13:40 +0100721 mutex_lock(&dir_f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700722
723 rd->magic = cpu_to_je16(JFFS2_MAGIC_BITMASK);
724 rd->nodetype = cpu_to_je16(JFFS2_NODETYPE_DIRENT);
725 rd->totlen = cpu_to_je32(sizeof(*rd) + namelen);
726 rd->hdr_crc = cpu_to_je32(crc32(0, rd, sizeof(struct jffs2_unknown_node)-4));
727
728 rd->pino = cpu_to_je32(dir_i->i_ino);
729 rd->version = cpu_to_je32(++dir_f->highest_version);
730 rd->ino = cpu_to_je32(inode->i_ino);
731 rd->mctime = cpu_to_je32(get_seconds());
732 rd->nsize = namelen;
733
734 /* XXX: This is ugly. */
735 rd->type = (mode & S_IFMT) >> 12;
736
737 rd->node_crc = cpu_to_je32(crc32(0, rd, sizeof(*rd)-8));
738 rd->name_crc = cpu_to_je32(crc32(0, dentry->d_name.name, namelen));
739
David Woodhouse9fe48542006-05-23 00:38:06 +0100740 fd = jffs2_write_dirent(c, dir_f, rd, dentry->d_name.name, namelen, ALLOC_NORMAL);
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000741
Linus Torvalds1da177e2005-04-16 15:20:36 -0700742 if (IS_ERR(fd)) {
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000743 /* dirent failed to write. Delete the inode normally
Linus Torvalds1da177e2005-04-16 15:20:36 -0700744 as if it were the final unlink() */
745 jffs2_complete_reservation(c);
746 jffs2_free_raw_dirent(rd);
David Woodhouseced22072008-04-22 15:13:40 +0100747 mutex_unlock(&dir_f->sem);
David Woodhousef324e4c2010-06-03 08:03:39 +0100748 ret = PTR_ERR(fd);
749 goto fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700750 }
751
752 dir_i->i_mtime = dir_i->i_ctime = ITIME(je32_to_cpu(rd->mctime));
753
754 jffs2_free_raw_dirent(rd);
755
756 /* Link the fd into the inode's list, obsoleting an old
757 one if necessary. */
758 jffs2_add_fd_to_list(c, fd, &dir_f->dents);
759
David Woodhouseced22072008-04-22 15:13:40 +0100760 mutex_unlock(&dir_f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700761 jffs2_complete_reservation(c);
762
763 d_instantiate(dentry, inode);
David Woodhousee72e6492010-06-03 08:09:12 +0100764 unlock_new_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700765 return 0;
David Woodhousef324e4c2010-06-03 08:03:39 +0100766
767 fail:
Al Viro41cce642010-06-08 13:24:56 -0400768 iget_failed(inode);
David Woodhousef324e4c2010-06-03 08:03:39 +0100769 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700770}
771
772static int jffs2_rename (struct inode *old_dir_i, struct dentry *old_dentry,
David Woodhouseef53cb02007-07-10 10:01:22 +0100773 struct inode *new_dir_i, struct dentry *new_dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700774{
775 int ret;
776 struct jffs2_sb_info *c = JFFS2_SB_INFO(old_dir_i->i_sb);
777 struct jffs2_inode_info *victim_f = NULL;
778 uint8_t type;
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100779 uint32_t now;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700780
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000781 /* The VFS will check for us and prevent trying to rename a
Linus Torvalds1da177e2005-04-16 15:20:36 -0700782 * file over a directory and vice versa, but if it's a directory,
783 * the VFS can't check whether the victim is empty. The filesystem
784 * needs to do that for itself.
785 */
786 if (new_dentry->d_inode) {
787 victim_f = JFFS2_INODE_INFO(new_dentry->d_inode);
788 if (S_ISDIR(new_dentry->d_inode->i_mode)) {
789 struct jffs2_full_dirent *fd;
790
David Woodhouseced22072008-04-22 15:13:40 +0100791 mutex_lock(&victim_f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700792 for (fd = victim_f->dents; fd; fd = fd->next) {
793 if (fd->ino) {
David Woodhouseced22072008-04-22 15:13:40 +0100794 mutex_unlock(&victim_f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700795 return -ENOTEMPTY;
796 }
797 }
David Woodhouseced22072008-04-22 15:13:40 +0100798 mutex_unlock(&victim_f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700799 }
800 }
801
802 /* XXX: We probably ought to alloc enough space for
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000803 both nodes at the same time. Writing the new link,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700804 then getting -ENOSPC, is quite bad :)
805 */
806
807 /* Make a hard link */
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000808
Linus Torvalds1da177e2005-04-16 15:20:36 -0700809 /* XXX: This is ugly */
810 type = (old_dentry->d_inode->i_mode & S_IFMT) >> 12;
811 if (!type) type = DT_REG;
812
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100813 now = get_seconds();
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000814 ret = jffs2_do_link(c, JFFS2_INODE_INFO(new_dir_i),
Linus Torvalds1da177e2005-04-16 15:20:36 -0700815 old_dentry->d_inode->i_ino, type,
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100816 new_dentry->d_name.name, new_dentry->d_name.len, now);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700817
818 if (ret)
819 return ret;
820
821 if (victim_f) {
822 /* There was a victim. Kill it off nicely */
Al Viro22ba7472011-07-21 15:57:47 -0400823 if (S_ISDIR(new_dentry->d_inode->i_mode))
824 clear_nlink(new_dentry->d_inode);
825 else
826 drop_nlink(new_dentry->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700827 /* Don't oops if the victim was a dirent pointing to an
828 inode which didn't exist. */
829 if (victim_f->inocache) {
David Woodhouseced22072008-04-22 15:13:40 +0100830 mutex_lock(&victim_f->sem);
David Woodhouse27c72b02008-05-01 18:47:17 +0100831 if (S_ISDIR(new_dentry->d_inode->i_mode))
832 victim_f->inocache->pino_nlink = 0;
833 else
834 victim_f->inocache->pino_nlink--;
David Woodhouseced22072008-04-22 15:13:40 +0100835 mutex_unlock(&victim_f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700836 }
837 }
838
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000839 /* If it was a directory we moved, and there was no victim,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700840 increase i_nlink on its new parent */
841 if (S_ISDIR(old_dentry->d_inode->i_mode) && !victim_f)
Dave Hansend8c76e62006-09-30 23:29:04 -0700842 inc_nlink(new_dir_i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700843
844 /* Unlink the original */
Thomas Gleixner182ec4e2005-11-07 11:16:07 +0000845 ret = jffs2_do_unlink(c, JFFS2_INODE_INFO(old_dir_i),
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100846 old_dentry->d_name.name, old_dentry->d_name.len, NULL, now);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700847
848 /* We don't touch inode->i_nlink */
849
850 if (ret) {
851 /* Oh shit. We really ought to make a single node which can do both atomically */
852 struct jffs2_inode_info *f = JFFS2_INODE_INFO(old_dentry->d_inode);
David Woodhouseced22072008-04-22 15:13:40 +0100853 mutex_lock(&f->sem);
Dave Hansend8c76e62006-09-30 23:29:04 -0700854 inc_nlink(old_dentry->d_inode);
David Woodhouse27c72b02008-05-01 18:47:17 +0100855 if (f->inocache && !S_ISDIR(old_dentry->d_inode->i_mode))
856 f->inocache->pino_nlink++;
David Woodhouseced22072008-04-22 15:13:40 +0100857 mutex_unlock(&f->sem);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700858
859 printk(KERN_NOTICE "jffs2_rename(): Link succeeded, unlink failed (err %d). You now have a hard link\n", ret);
860 /* Might as well let the VFS know */
861 d_instantiate(new_dentry, old_dentry->d_inode);
Al Viro7de9c6ee2010-10-23 11:11:40 -0400862 ihold(old_dentry->d_inode);
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100863 new_dir_i->i_mtime = new_dir_i->i_ctime = ITIME(now);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700864 return ret;
865 }
866
867 if (S_ISDIR(old_dentry->d_inode->i_mode))
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700868 drop_nlink(old_dir_i);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700869
Artem B. Bityutskiy3a69e0c2005-08-17 14:46:26 +0100870 new_dir_i->i_mtime = new_dir_i->i_ctime = old_dir_i->i_mtime = old_dir_i->i_ctime = ITIME(now);
871
Linus Torvalds1da177e2005-04-16 15:20:36 -0700872 return 0;
873}
874