blob: a1559f762805390fbc9854859040d397aa42c208 [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 */
Al Viro9cdce3c2015-11-15 18:24:17 -0500126 inode->i_op = &page_symlink_inode_operations;
Al Viro21fc61c2015-11-17 01:07:57 -0500127 inode_nohighmem(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 inode->i_mapping->a_ops = &ufs_aops;
129 err = page_symlink(inode, symname, l);
130 if (err)
131 goto out_fail;
132 } else {
133 /* fast symlink */
Al Viro9cdce3c2015-11-15 18:24:17 -0500134 inode->i_op = &simple_symlink_inode_operations;
Al Viro4b8061a2015-05-02 10:28:56 -0400135 inode->i_link = (char *)UFS_I(inode)->i_u1.i_symlink;
136 memcpy(inode->i_link, symname, l);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 inode->i_size = l-1;
138 }
139 mark_inode_dirty(inode);
140
Al Viroa50e4a02015-06-16 01:50:43 -0400141 return ufs_add_nondir(dentry, inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142
143out_fail:
Alexey Dobriyan32575452006-03-23 03:00:53 -0800144 inode_dec_link_count(inode);
Al Viroe4502c62014-09-26 21:17:52 -0400145 unlock_new_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 iput(inode);
Al Viroa50e4a02015-06-16 01:50:43 -0400147 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148}
149
150static int ufs_link (struct dentry * old_dentry, struct inode * dir,
151 struct dentry *dentry)
152{
David Howells2b0143b2015-03-17 22:25:59 +0000153 struct inode *inode = d_inode(old_dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154 int error;
155
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156 inode->i_ctime = CURRENT_TIME_SEC;
Alexey Dobriyan32575452006-03-23 03:00:53 -0800157 inode_inc_link_count(inode);
Al Viro7de9c6ee2010-10-23 11:11:40 -0400158 ihold(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159
Jan Kara12ecbb42015-06-01 14:52:04 +0200160 error = ufs_add_link(dentry, inode);
161 if (error) {
162 inode_dec_link_count(inode);
163 iput(inode);
164 } else
165 d_instantiate(dentry, inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 return error;
167}
168
Al Viro18bb1db2011-07-26 01:41:39 -0400169static int ufs_mkdir(struct inode * dir, struct dentry * dentry, umode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700170{
171 struct inode * inode;
Al Viro8de52772012-02-06 12:45:27 -0500172 int err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700173
Fabian Frederick13b987e2015-06-10 10:09:32 +1000174 inode_inc_link_count(dir);
175
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 inode = ufs_new_inode(dir, S_IFDIR|mode);
Fabian Frederick13b987e2015-06-10 10:09:32 +1000177 err = PTR_ERR(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700178 if (IS_ERR(inode))
Fabian Frederick13b987e2015-06-10 10:09:32 +1000179 goto out_dir;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180
181 inode->i_op = &ufs_dir_inode_operations;
182 inode->i_fop = &ufs_dir_operations;
Evgeniy Dushistov826843a2006-06-25 05:47:21 -0700183 inode->i_mapping->a_ops = &ufs_aops;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700184
Alexey Dobriyan32575452006-03-23 03:00:53 -0800185 inode_inc_link_count(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186
187 err = ufs_make_empty(inode, dir);
188 if (err)
189 goto out_fail;
190
191 err = ufs_add_link(dentry, inode);
192 if (err)
193 goto out_fail;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194
Jan Kara514d7482015-06-02 11:26:34 +0200195 unlock_new_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 d_instantiate(dentry, inode);
Al Viroa50e4a02015-06-16 01:50:43 -0400197 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198
199out_fail:
Alexey Dobriyan32575452006-03-23 03:00:53 -0800200 inode_dec_link_count(inode);
201 inode_dec_link_count(inode);
Al Viroe4502c62014-09-26 21:17:52 -0400202 unlock_new_inode(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 iput (inode);
Fabian Frederick13b987e2015-06-10 10:09:32 +1000204out_dir:
Alexey Dobriyan32575452006-03-23 03:00:53 -0800205 inode_dec_link_count(dir);
Al Viroa50e4a02015-06-16 01:50:43 -0400206 return err;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207}
208
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700209static int ufs_unlink(struct inode *dir, struct dentry *dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210{
David Howells2b0143b2015-03-17 22:25:59 +0000211 struct inode * inode = d_inode(dentry);
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700212 struct ufs_dir_entry *de;
213 struct page *page;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 int err = -ENOENT;
215
Alexey Dobriyan08049702009-12-15 16:46:50 -0800216 de = ufs_find_entry(dir, &dentry->d_name, &page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 if (!de)
218 goto out;
219
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700220 err = ufs_delete_entry(dir, de, page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 if (err)
222 goto out;
223
224 inode->i_ctime = dir->i_ctime;
Alexey Dobriyan32575452006-03-23 03:00:53 -0800225 inode_dec_link_count(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700226 err = 0;
227out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700228 return err;
229}
230
231static int ufs_rmdir (struct inode * dir, struct dentry *dentry)
232{
David Howells2b0143b2015-03-17 22:25:59 +0000233 struct inode * inode = d_inode(dentry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234 int err= -ENOTEMPTY;
235
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 if (ufs_empty_dir (inode)) {
237 err = ufs_unlink(dir, dentry);
238 if (!err) {
239 inode->i_size = 0;
Alexey Dobriyan32575452006-03-23 03:00:53 -0800240 inode_dec_link_count(inode);
241 inode_dec_link_count(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242 }
243 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 return err;
245}
246
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700247static int ufs_rename(struct inode *old_dir, struct dentry *old_dentry,
248 struct inode *new_dir, struct dentry *new_dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249{
David Howells2b0143b2015-03-17 22:25:59 +0000250 struct inode *old_inode = d_inode(old_dentry);
251 struct inode *new_inode = d_inode(new_dentry);
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700252 struct page *dir_page = NULL;
253 struct ufs_dir_entry * dir_de = NULL;
254 struct page *old_page;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 struct ufs_dir_entry *old_de;
256 int err = -ENOENT;
257
Alexey Dobriyan08049702009-12-15 16:46:50 -0800258 old_de = ufs_find_entry(old_dir, &old_dentry->d_name, &old_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259 if (!old_de)
260 goto out;
261
262 if (S_ISDIR(old_inode->i_mode)) {
263 err = -EIO;
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700264 dir_de = ufs_dotdot(old_inode, &dir_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 if (!dir_de)
266 goto out_old;
267 }
268
269 if (new_inode) {
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700270 struct page *new_page;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 struct ufs_dir_entry *new_de;
272
273 err = -ENOTEMPTY;
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700274 if (dir_de && !ufs_empty_dir(new_inode))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700275 goto out_dir;
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700276
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 err = -ENOENT;
Alexey Dobriyan08049702009-12-15 16:46:50 -0800278 new_de = ufs_find_entry(new_dir, &new_dentry->d_name, &new_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 if (!new_de)
280 goto out_dir;
Al Viro70d45cd2015-06-16 01:56:23 -0400281 ufs_set_link(new_dir, new_de, new_page, old_inode, 1);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700282 new_inode->i_ctime = CURRENT_TIME_SEC;
283 if (dir_de)
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700284 drop_nlink(new_inode);
Alexey Dobriyan32575452006-03-23 03:00:53 -0800285 inode_dec_link_count(new_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 } else {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 err = ufs_add_link(new_dentry, old_inode);
Al Viro37750cd2011-03-02 09:40:21 -0500288 if (err)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700289 goto out_dir;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 if (dir_de)
Alexey Dobriyan32575452006-03-23 03:00:53 -0800291 inode_inc_link_count(new_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 }
293
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700294 /*
295 * Like most other Unix systems, set the ctime for inodes on a
296 * rename.
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700297 */
298 old_inode->i_ctime = CURRENT_TIME_SEC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700300 ufs_delete_entry(old_dir, old_de, old_page);
Al Viro37750cd2011-03-02 09:40:21 -0500301 mark_inode_dirty(old_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302
303 if (dir_de) {
Al Viro70d45cd2015-06-16 01:56:23 -0400304 if (old_dir != new_dir)
305 ufs_set_link(old_inode, dir_de, dir_page, new_dir, 0);
306 else {
307 kunmap(dir_page);
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300308 put_page(dir_page);
Al Viro70d45cd2015-06-16 01:56:23 -0400309 }
Alexey Dobriyan32575452006-03-23 03:00:53 -0800310 inode_dec_link_count(old_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312 return 0;
313
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700314
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315out_dir:
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700316 if (dir_de) {
317 kunmap(dir_page);
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300318 put_page(dir_page);
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700319 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700320out_old:
Evgeniy Dushistovb71034e2006-06-25 05:47:22 -0700321 kunmap(old_page);
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300322 put_page(old_page);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324 return err;
325}
326
Arjan van de Venc5ef1c42007-02-12 00:55:40 -0800327const struct inode_operations ufs_dir_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328 .create = ufs_create,
329 .lookup = ufs_lookup,
330 .link = ufs_link,
331 .unlink = ufs_unlink,
332 .symlink = ufs_symlink,
333 .mkdir = ufs_mkdir,
334 .rmdir = ufs_rmdir,
335 .mknod = ufs_mknod,
336 .rename = ufs_rename,
337};