blob: 47966554317c922da9c73d904f0ea104ec0392f2 [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
Alexey Dobriyan08049702009-12-15 16:46:50 -080059 ino = ufs_inode_by_name(dir, &dentry->d_name);
Al Viro642c9372011-07-17 10:07:34 -040060 if (ino)
David Howellsb55c4602008-02-07 00:15:48 -080061 inode = ufs_iget(dir->i_sb, ino);
Al Viro642c9372011-07-17 10:07:34 -040062 return d_splice_alias(inode, dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -070063}
64
65/*
66 * By the time this is called, we already have created
67 * the directory cache entry for the new file, but it
68 * is so far negative - it has no inode.
69 *
70 * If the create succeeds, we fill in the inode information
71 * with d_instantiate().
72 */
Al Viro4acdaf22011-07-26 01:42:34 -040073static int ufs_create (struct inode * dir, struct dentry * dentry, umode_t mode,
Al Viroebfc3b42012-06-10 18:05:36 -040074 bool excl)
Linus Torvalds1da177e2005-04-16 15:20:36 -070075{
Evgeniy Dushistovabf5d152006-06-25 05:47:24 -070076 struct inode *inode;
Christoph Hellwig907f4552010-03-03 09:05:06 -050077
Evgeniy Dushistovabf5d152006-06-25 05:47:24 -070078 inode = ufs_new_inode(dir, mode);
Al Viroa50e4a02015-06-16 01:50:43 -040079 if (IS_ERR(inode))
80 return PTR_ERR(inode);
Evgeniy Dushistovabf5d152006-06-25 05:47:24 -070081
Al Viroa50e4a02015-06-16 01:50:43 -040082 inode->i_op = &ufs_file_inode_operations;
83 inode->i_fop = &ufs_file_operations;
84 inode->i_mapping->a_ops = &ufs_aops;
85 mark_inode_dirty(inode);
86 return ufs_add_nondir(dentry, inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070087}
88
Al Viro1a67aaf2011-07-26 01:52:52 -040089static int ufs_mknod(struct inode *dir, struct dentry *dentry, umode_t mode, dev_t rdev)
Linus Torvalds1da177e2005-04-16 15:20:36 -070090{
91 struct inode *inode;
92 int err;
93
94 if (!old_valid_dev(rdev))
95 return -EINVAL;
Christoph Hellwig907f4552010-03-03 09:05:06 -050096
Linus Torvalds1da177e2005-04-16 15:20:36 -070097 inode = ufs_new_inode(dir, mode);
98 err = PTR_ERR(inode);
99 if (!IS_ERR(inode)) {
100 init_special_inode(inode, mode, rdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 ufs_set_inode_dev(inode->i_sb, UFS_I(inode), rdev);
102 mark_inode_dirty(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103 err = ufs_add_nondir(dentry, inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 }
105 return err;
106}
107
108static int ufs_symlink (struct inode * dir, struct dentry * dentry,
109 const char * symname)
110{
111 struct super_block * sb = dir->i_sb;
Al Viroa50e4a02015-06-16 01:50:43 -0400112 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113 unsigned l = strlen(symname)+1;
114 struct inode * inode;
115
116 if (l > sb->s_blocksize)
Al Viroa50e4a02015-06-16 01:50:43 -0400117 return -ENAMETOOLONG;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 inode = ufs_new_inode(dir, S_IFLNK | S_IRWXUGO);
120 err = PTR_ERR(inode);
121 if (IS_ERR(inode))
Al Viroa50e4a02015-06-16 01:50:43 -0400122 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700123
124 if (l > UFS_SB(sb)->s_uspi->s_maxsymlinklen) {
125 /* slow symlink */
Dmitry Monakhov311b95492010-04-15 00:56:58 +0200126 inode->i_op = &ufs_symlink_inode_operations;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127 inode->i_mapping->a_ops = &ufs_aops;
128 err = page_symlink(inode, symname, l);
129 if (err)
130 goto out_fail;
131 } else {
132 /* fast symlink */
133 inode->i_op = &ufs_fast_symlink_inode_operations;
Al Viro4b8061a2015-05-02 10:28:56 -0400134 inode->i_link = (char *)UFS_I(inode)->i_u1.i_symlink;
135 memcpy(inode->i_link, symname, l);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700136 inode->i_size = l-1;
137 }
138 mark_inode_dirty(inode);
139
Al Viroa50e4a02015-06-16 01:50:43 -0400140 return ufs_add_nondir(dentry, inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141
142out_fail:
Alexey Dobriyan32575452006-03-23 03:00:53 -0800143 inode_dec_link_count(inode);
Al Viroe4502c62014-09-26 21:17:52 -0400144 unlock_new_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 iput(inode);
Al Viroa50e4a02015-06-16 01:50:43 -0400146 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147}
148
149static int ufs_link (struct dentry * old_dentry, struct inode * dir,
150 struct dentry *dentry)
151{
David Howells2b0143b2015-03-17 22:25:59 +0000152 struct inode *inode = d_inode(old_dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153 int error;
154
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 inode->i_ctime = CURRENT_TIME_SEC;
Alexey Dobriyan32575452006-03-23 03:00:53 -0800156 inode_inc_link_count(inode);
Al Viro7de9c6ee2010-10-23 11:11:40 -0400157 ihold(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158
Jan Kara12ecbb42015-06-01 14:52:04 +0200159 error = ufs_add_link(dentry, inode);
160 if (error) {
161 inode_dec_link_count(inode);
162 iput(inode);
163 } else
164 d_instantiate(dentry, inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700165 return error;
166}
167
Al Viro18bb1db2011-07-26 01:41:39 -0400168static int ufs_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169{
170 struct inode * inode;
Al Viro8de52772012-02-06 12:45:27 -0500171 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172
Fabian Frederick13b987e2015-06-10 10:09:32 +1000173 inode_inc_link_count(dir);
174
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175 inode = ufs_new_inode(dir, S_IFDIR|mode);
Fabian Frederick13b987e2015-06-10 10:09:32 +1000176 err = PTR_ERR(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177 if (IS_ERR(inode))
Fabian Frederick13b987e2015-06-10 10:09:32 +1000178 goto out_dir;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700179
180 inode->i_op = &ufs_dir_inode_operations;
181 inode->i_fop = &ufs_dir_operations;
Evgeniy Dushistov826843a2006-06-25 05:47:21 -0700182 inode->i_mapping->a_ops = &ufs_aops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183
Alexey Dobriyan32575452006-03-23 03:00:53 -0800184 inode_inc_link_count(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700185
186 err = ufs_make_empty(inode, dir);
187 if (err)
188 goto out_fail;
189
190 err = ufs_add_link(dentry, inode);
191 if (err)
192 goto out_fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193
Jan Kara514d7482015-06-02 11:26:34 +0200194 unlock_new_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700195 d_instantiate(dentry, inode);
Al Viroa50e4a02015-06-16 01:50:43 -0400196 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197
198out_fail:
Alexey Dobriyan32575452006-03-23 03:00:53 -0800199 inode_dec_link_count(inode);
200 inode_dec_link_count(inode);
Al Viroe4502c62014-09-26 21:17:52 -0400201 unlock_new_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202 iput (inode);
Fabian Frederick13b987e2015-06-10 10:09:32 +1000203out_dir:
Alexey Dobriyan32575452006-03-23 03:00:53 -0800204 inode_dec_link_count(dir);
Al Viroa50e4a02015-06-16 01:50:43 -0400205 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206}
207
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700208static int ufs_unlink(struct inode *dir, struct dentry *dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209{
David Howells2b0143b2015-03-17 22:25:59 +0000210 struct inode * inode = d_inode(dentry);
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700211 struct ufs_dir_entry *de;
212 struct page *page;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213 int err = -ENOENT;
214
Alexey Dobriyan08049702009-12-15 16:46:50 -0800215 de = ufs_find_entry(dir, &dentry->d_name, &page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 if (!de)
217 goto out;
218
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700219 err = ufs_delete_entry(dir, de, page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220 if (err)
221 goto out;
222
223 inode->i_ctime = dir->i_ctime;
Alexey Dobriyan32575452006-03-23 03:00:53 -0800224 inode_dec_link_count(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700225 err = 0;
226out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700227 return err;
228}
229
230static int ufs_rmdir (struct inode * dir, struct dentry *dentry)
231{
David Howells2b0143b2015-03-17 22:25:59 +0000232 struct inode * inode = d_inode(dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 int err= -ENOTEMPTY;
234
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 if (ufs_empty_dir (inode)) {
236 err = ufs_unlink(dir, dentry);
237 if (!err) {
238 inode->i_size = 0;
Alexey Dobriyan32575452006-03-23 03:00:53 -0800239 inode_dec_link_count(inode);
240 inode_dec_link_count(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241 }
242 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 return err;
244}
245
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700246static int ufs_rename(struct inode *old_dir, struct dentry *old_dentry,
247 struct inode *new_dir, struct dentry *new_dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248{
David Howells2b0143b2015-03-17 22:25:59 +0000249 struct inode *old_inode = d_inode(old_dentry);
250 struct inode *new_inode = d_inode(new_dentry);
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700251 struct page *dir_page = NULL;
252 struct ufs_dir_entry * dir_de = NULL;
253 struct page *old_page;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254 struct ufs_dir_entry *old_de;
255 int err = -ENOENT;
256
Alexey Dobriyan08049702009-12-15 16:46:50 -0800257 old_de = ufs_find_entry(old_dir, &old_dentry->d_name, &old_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 if (!old_de)
259 goto out;
260
261 if (S_ISDIR(old_inode->i_mode)) {
262 err = -EIO;
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700263 dir_de = ufs_dotdot(old_inode, &dir_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700264 if (!dir_de)
265 goto out_old;
266 }
267
268 if (new_inode) {
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700269 struct page *new_page;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 struct ufs_dir_entry *new_de;
271
272 err = -ENOTEMPTY;
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700273 if (dir_de && !ufs_empty_dir(new_inode))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 goto out_dir;
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700275
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 err = -ENOENT;
Alexey Dobriyan08049702009-12-15 16:46:50 -0800277 new_de = ufs_find_entry(new_dir, &new_dentry->d_name, &new_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278 if (!new_de)
279 goto out_dir;
Al Viro70d45cd2015-06-16 01:56:23 -0400280 ufs_set_link(new_dir, new_de, new_page, old_inode, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 new_inode->i_ctime = CURRENT_TIME_SEC;
282 if (dir_de)
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700283 drop_nlink(new_inode);
Alexey Dobriyan32575452006-03-23 03:00:53 -0800284 inode_dec_link_count(new_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700285 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 err = ufs_add_link(new_dentry, old_inode);
Al Viro37750cd2011-03-02 09:40:21 -0500287 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 goto out_dir;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 if (dir_de)
Alexey Dobriyan32575452006-03-23 03:00:53 -0800290 inode_inc_link_count(new_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 }
292
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700293 /*
294 * Like most other Unix systems, set the ctime for inodes on a
295 * rename.
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700296 */
297 old_inode->i_ctime = CURRENT_TIME_SEC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700299 ufs_delete_entry(old_dir, old_de, old_page);
Al Viro37750cd2011-03-02 09:40:21 -0500300 mark_inode_dirty(old_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301
302 if (dir_de) {
Al Viro70d45cd2015-06-16 01:56:23 -0400303 if (old_dir != new_dir)
304 ufs_set_link(old_inode, dir_de, dir_page, new_dir, 0);
305 else {
306 kunmap(dir_page);
307 page_cache_release(dir_page);
308 }
Alexey Dobriyan32575452006-03-23 03:00:53 -0800309 inode_dec_link_count(old_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 return 0;
312
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700313
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314out_dir:
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700315 if (dir_de) {
316 kunmap(dir_page);
317 page_cache_release(dir_page);
318 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319out_old:
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700320 kunmap(old_page);
321 page_cache_release(old_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 return err;
324}
325
Arjan van de Venc5ef1c42007-02-12 00:55:40 -0800326const struct inode_operations ufs_dir_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327 .create = ufs_create,
328 .lookup = ufs_lookup,
329 .link = ufs_link,
330 .unlink = ufs_unlink,
331 .symlink = ufs_symlink,
332 .mkdir = ufs_mkdir,
333 .rmdir = ufs_rmdir,
334 .mknod = ufs_mknod,
335 .rename = ufs_rename,
336};