blob: fd65deb4b5f095e3103028b83f214ffba73707f7 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
2 * linux/fs/ufs/namei.c
3 *
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -07004 * Migration to usage of "page cache" on May 2006 by
5 * Evgeniy Dushistov <dushistov@mail.ru> based on ext2 code base.
6 *
Linus Torvalds1da177e2005-04-16 15:20:36 -07007 * Copyright (C) 1998
8 * Daniel Pirkl <daniel.pirkl@email.cz>
9 * Charles University, Faculty of Mathematics and Physics
10 *
11 * from
12 *
13 * linux/fs/ext2/namei.c
14 *
15 * Copyright (C) 1992, 1993, 1994, 1995
16 * Remy Card (card@masi.ibp.fr)
17 * Laboratoire MASI - Institut Blaise Pascal
18 * Universite Pierre et Marie Curie (Paris VI)
19 *
20 * from
21 *
22 * linux/fs/minix/namei.c
23 *
24 * Copyright (C) 1991, 1992 Linus Torvalds
25 *
26 * Big-endian to little-endian byte-swapping/bitmaps by
27 * David S. Miller (davem@caip.rutgers.edu), 1995
28 */
29
30#include <linux/time.h>
31#include <linux/fs.h>
Mike Frysingere5420592008-02-08 04:21:31 -080032
33#include "ufs_fs.h"
Christoph Hellwigbcd6d4e2007-10-16 23:26:51 -070034#include "ufs.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070035#include "util.h"
36
Linus Torvalds1da177e2005-04-16 15:20:36 -070037static inline int ufs_add_nondir(struct dentry *dentry, struct inode *inode)
38{
39 int err = ufs_add_link(dentry, inode);
40 if (!err) {
Al Viroe4502c62014-09-26 21:17:52 -040041 unlock_new_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070042 d_instantiate(dentry, inode);
43 return 0;
44 }
Alexey Dobriyan32575452006-03-23 03:00:53 -080045 inode_dec_link_count(inode);
Al Viroe4502c62014-09-26 21:17:52 -040046 unlock_new_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070047 iput(inode);
48 return err;
49}
50
Al Viro00cd8dd2012-06-10 17:13:09 -040051static struct dentry *ufs_lookup(struct inode * dir, struct dentry *dentry, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -070052{
53 struct inode * inode = NULL;
54 ino_t ino;
55
56 if (dentry->d_name.len > UFS_MAXNAMLEN)
57 return ERR_PTR(-ENAMETOOLONG);
58
Arnd Bergmann788257d2011-01-24 10:14:12 +010059 lock_ufs(dir->i_sb);
Alexey Dobriyan08049702009-12-15 16:46:50 -080060 ino = ufs_inode_by_name(dir, &dentry->d_name);
Al Viro642c9372011-07-17 10:07:34 -040061 if (ino)
David Howellsb55c4602008-02-07 00:15:48 -080062 inode = ufs_iget(dir->i_sb, ino);
Arnd Bergmann788257d2011-01-24 10:14:12 +010063 unlock_ufs(dir->i_sb);
Al Viro642c9372011-07-17 10:07:34 -040064 return d_splice_alias(inode, dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -070065}
66
67/*
68 * By the time this is called, we already have created
69 * the directory cache entry for the new file, but it
70 * is so far negative - it has no inode.
71 *
72 * If the create succeeds, we fill in the inode information
73 * with d_instantiate().
74 */
Al Viro4acdaf22011-07-26 01:42:34 -040075static int ufs_create (struct inode * dir, struct dentry * dentry, umode_t mode,
Al Viroebfc3b42012-06-10 18:05:36 -040076 bool excl)
Linus Torvalds1da177e2005-04-16 15:20:36 -070077{
Evgeniy Dushistovabf5d152006-06-25 05:47:24 -070078 struct inode *inode;
79 int err;
80
81 UFSD("BEGIN\n");
Christoph Hellwig907f4552010-03-03 09:05:06 -050082
Evgeniy Dushistovabf5d152006-06-25 05:47:24 -070083 inode = ufs_new_inode(dir, mode);
84 err = PTR_ERR(inode);
85
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 if (!IS_ERR(inode)) {
87 inode->i_op = &ufs_file_inode_operations;
88 inode->i_fop = &ufs_file_operations;
89 inode->i_mapping->a_ops = &ufs_aops;
90 mark_inode_dirty(inode);
Arnd Bergmann788257d2011-01-24 10:14:12 +010091 lock_ufs(dir->i_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070092 err = ufs_add_nondir(dentry, inode);
Arnd Bergmann788257d2011-01-24 10:14:12 +010093 unlock_ufs(dir->i_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 }
Evgeniy Dushistovabf5d152006-06-25 05:47:24 -070095 UFSD("END: err=%d\n", err);
Linus Torvalds1da177e2005-04-16 15:20:36 -070096 return err;
97}
98
Al Viro1a67aaf2011-07-26 01:52:52 -040099static int ufs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100{
101 struct inode *inode;
102 int err;
103
104 if (!old_valid_dev(rdev))
105 return -EINVAL;
Christoph Hellwig907f4552010-03-03 09:05:06 -0500106
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 inode = ufs_new_inode(dir, mode);
108 err = PTR_ERR(inode);
109 if (!IS_ERR(inode)) {
110 init_special_inode(inode, mode, rdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 ufs_set_inode_dev(inode->i_sb, UFS_I(inode), rdev);
112 mark_inode_dirty(inode);
Arnd Bergmann788257d2011-01-24 10:14:12 +0100113 lock_ufs(dir->i_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700114 err = ufs_add_nondir(dentry, inode);
Arnd Bergmann788257d2011-01-24 10:14:12 +0100115 unlock_ufs(dir->i_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700116 }
117 return err;
118}
119
120static int ufs_symlink (struct inode * dir, struct dentry * dentry,
121 const char * symname)
122{
123 struct super_block * sb = dir->i_sb;
124 int err = -ENAMETOOLONG;
125 unsigned l = strlen(symname)+1;
126 struct inode * inode;
127
128 if (l > sb->s_blocksize)
Josh Triplett344fe782006-07-30 03:03:59 -0700129 goto out_notlocked;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131 inode = ufs_new_inode(dir, S_IFLNK | S_IRWXUGO);
132 err = PTR_ERR(inode);
133 if (IS_ERR(inode))
Alexey Khoroshilov9ef7db72014-09-02 11:40:17 +0400134 goto out_notlocked;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135
Alexey Khoroshilov9ef7db72014-09-02 11:40:17 +0400136 lock_ufs(dir->i_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 if (l > UFS_SB(sb)->s_uspi->s_maxsymlinklen) {
138 /* slow symlink */
Dmitry Monakhov311b95492010-04-15 00:56:58 +0200139 inode->i_op = &ufs_symlink_inode_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 inode->i_mapping->a_ops = &ufs_aops;
141 err = page_symlink(inode, symname, l);
142 if (err)
143 goto out_fail;
144 } else {
145 /* fast symlink */
146 inode->i_op = &ufs_fast_symlink_inode_operations;
Duane Griffin723be1f2009-01-08 22:43:51 +0000147 memcpy(UFS_I(inode)->i_u1.i_symlink, symname, l);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148 inode->i_size = l-1;
149 }
150 mark_inode_dirty(inode);
151
152 err = ufs_add_nondir(dentry, inode);
153out:
Arnd Bergmann788257d2011-01-24 10:14:12 +0100154 unlock_ufs(dir->i_sb);
Josh Triplett344fe782006-07-30 03:03:59 -0700155out_notlocked:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 return err;
157
158out_fail:
Alexey Dobriyan32575452006-03-23 03:00:53 -0800159 inode_dec_link_count(inode);
Al Viroe4502c62014-09-26 21:17:52 -0400160 unlock_new_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700161 iput(inode);
162 goto out;
163}
164
165static int ufs_link (struct dentry * old_dentry, struct inode * dir,
166 struct dentry *dentry)
167{
168 struct inode *inode = old_dentry->d_inode;
169 int error;
170
Arnd Bergmann788257d2011-01-24 10:14:12 +0100171 lock_ufs(dir->i_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172
173 inode->i_ctime = CURRENT_TIME_SEC;
Alexey Dobriyan32575452006-03-23 03:00:53 -0800174 inode_inc_link_count(inode);
Al Viro7de9c6ee2010-10-23 11:11:40 -0400175 ihold(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176
177 error = ufs_add_nondir(dentry, inode);
Arnd Bergmann788257d2011-01-24 10:14:12 +0100178 unlock_ufs(dir->i_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179 return error;
180}
181
Al Viro18bb1db2011-07-26 01:41:39 -0400182static int ufs_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183{
184 struct inode * inode;
Al Viro8de52772012-02-06 12:45:27 -0500185 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187 inode = ufs_new_inode(dir, S_IFDIR|mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 if (IS_ERR(inode))
Alexey Khoroshilov9ef7db72014-09-02 11:40:17 +0400189 return PTR_ERR(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190
191 inode->i_op = &ufs_dir_inode_operations;
192 inode->i_fop = &ufs_dir_operations;
Evgeniy Dushistov826843a2006-06-25 05:47:21 -0700193 inode->i_mapping->a_ops = &ufs_aops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194
Alexey Dobriyan32575452006-03-23 03:00:53 -0800195 inode_inc_link_count(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196
Alexey Khoroshilov9ef7db72014-09-02 11:40:17 +0400197 lock_ufs(dir->i_sb);
198 inode_inc_link_count(dir);
199
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 err = ufs_make_empty(inode, dir);
201 if (err)
202 goto out_fail;
203
204 err = ufs_add_link(dentry, inode);
205 if (err)
206 goto out_fail;
Arnd Bergmann788257d2011-01-24 10:14:12 +0100207 unlock_ufs(dir->i_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208
209 d_instantiate(dentry, inode);
210out:
211 return err;
212
213out_fail:
Alexey Dobriyan32575452006-03-23 03:00:53 -0800214 inode_dec_link_count(inode);
215 inode_dec_link_count(inode);
Al Viroe4502c62014-09-26 21:17:52 -0400216 unlock_new_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 iput (inode);
Alexey Dobriyan32575452006-03-23 03:00:53 -0800218 inode_dec_link_count(dir);
Arnd Bergmann788257d2011-01-24 10:14:12 +0100219 unlock_ufs(dir->i_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 goto out;
221}
222
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700223static int ufs_unlink(struct inode *dir, struct dentry *dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224{
225 struct inode * inode = dentry->d_inode;
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700226 struct ufs_dir_entry *de;
227 struct page *page;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 int err = -ENOENT;
229
Alexey Dobriyan08049702009-12-15 16:46:50 -0800230 de = ufs_find_entry(dir, &dentry->d_name, &page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 if (!de)
232 goto out;
233
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700234 err = ufs_delete_entry(dir, de, page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 if (err)
236 goto out;
237
238 inode->i_ctime = dir->i_ctime;
Alexey Dobriyan32575452006-03-23 03:00:53 -0800239 inode_dec_link_count(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 err = 0;
241out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 return err;
243}
244
245static int ufs_rmdir (struct inode * dir, struct dentry *dentry)
246{
247 struct inode * inode = dentry->d_inode;
248 int err= -ENOTEMPTY;
249
Arnd Bergmann788257d2011-01-24 10:14:12 +0100250 lock_ufs(dir->i_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700251 if (ufs_empty_dir (inode)) {
252 err = ufs_unlink(dir, dentry);
253 if (!err) {
254 inode->i_size = 0;
Alexey Dobriyan32575452006-03-23 03:00:53 -0800255 inode_dec_link_count(inode);
256 inode_dec_link_count(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257 }
258 }
Arnd Bergmann788257d2011-01-24 10:14:12 +0100259 unlock_ufs(dir->i_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700260 return err;
261}
262
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700263static int ufs_rename(struct inode *old_dir, struct dentry *old_dentry,
264 struct inode *new_dir, struct dentry *new_dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265{
266 struct inode *old_inode = old_dentry->d_inode;
267 struct inode *new_inode = new_dentry->d_inode;
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700268 struct page *dir_page = NULL;
269 struct ufs_dir_entry * dir_de = NULL;
270 struct page *old_page;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 struct ufs_dir_entry *old_de;
272 int err = -ENOENT;
273
Alexey Dobriyan08049702009-12-15 16:46:50 -0800274 old_de = ufs_find_entry(old_dir, &old_dentry->d_name, &old_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 if (!old_de)
276 goto out;
277
278 if (S_ISDIR(old_inode->i_mode)) {
279 err = -EIO;
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700280 dir_de = ufs_dotdot(old_inode, &dir_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 if (!dir_de)
282 goto out_old;
283 }
284
285 if (new_inode) {
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700286 struct page *new_page;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 struct ufs_dir_entry *new_de;
288
289 err = -ENOTEMPTY;
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700290 if (dir_de && !ufs_empty_dir(new_inode))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 goto out_dir;
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700292
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 err = -ENOENT;
Alexey Dobriyan08049702009-12-15 16:46:50 -0800294 new_de = ufs_find_entry(new_dir, &new_dentry->d_name, &new_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 if (!new_de)
296 goto out_dir;
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700297 ufs_set_link(new_dir, new_de, new_page, old_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298 new_inode->i_ctime = CURRENT_TIME_SEC;
299 if (dir_de)
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700300 drop_nlink(new_inode);
Alexey Dobriyan32575452006-03-23 03:00:53 -0800301 inode_dec_link_count(new_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 err = ufs_add_link(new_dentry, old_inode);
Al Viro37750cd2011-03-02 09:40:21 -0500304 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 goto out_dir;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306 if (dir_de)
Alexey Dobriyan32575452006-03-23 03:00:53 -0800307 inode_inc_link_count(new_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 }
309
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700310 /*
311 * Like most other Unix systems, set the ctime for inodes on a
312 * rename.
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700313 */
314 old_inode->i_ctime = CURRENT_TIME_SEC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700316 ufs_delete_entry(old_dir, old_de, old_page);
Al Viro37750cd2011-03-02 09:40:21 -0500317 mark_inode_dirty(old_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318
319 if (dir_de) {
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700320 ufs_set_link(old_inode, dir_de, dir_page, new_dir);
Alexey Dobriyan32575452006-03-23 03:00:53 -0800321 inode_dec_link_count(old_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 return 0;
324
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700325
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326out_dir:
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700327 if (dir_de) {
328 kunmap(dir_page);
329 page_cache_release(dir_page);
330 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331out_old:
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700332 kunmap(old_page);
333 page_cache_release(old_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335 return err;
336}
337
Arjan van de Venc5ef1c42007-02-12 00:55:40 -0800338const struct inode_operations ufs_dir_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339 .create = ufs_create,
340 .lookup = ufs_lookup,
341 .link = ufs_link,
342 .unlink = ufs_unlink,
343 .symlink = ufs_symlink,
344 .mkdir = ufs_mkdir,
345 .rmdir = ufs_rmdir,
346 .mknod = ufs_mknod,
347 .rename = ufs_rename,
348};