ia64/linux-2.6.18-xen.hg

view fs/ufs/namei.c @ 452:c7ed6fe5dca0

kexec: dont initialise regions in reserve_memory()

There is no need to initialise efi_memmap_res and boot_param_res in
reserve_memory() for the initial xen domain as it is done in
machine_kexec_setup_resources() using values from the kexec hypercall.

Signed-off-by: Simon Horman <horms@verge.net.au>
author Keir Fraser <keir.fraser@citrix.com>
date Thu Feb 28 10:55:18 2008 +0000 (2008-02-28)
parents 831230e53067
children
line source
1 /*
2 * linux/fs/ufs/namei.c
3 *
4 * Migration to usage of "page cache" on May 2006 by
5 * Evgeniy Dushistov <dushistov@mail.ru> based on ext2 code base.
6 *
7 * 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 */
30 #include <linux/time.h>
31 #include <linux/fs.h>
32 #include <linux/ufs_fs.h>
33 #include <linux/smp_lock.h>
34 #include "swab.h" /* will go away - see comment in mknod() */
35 #include "util.h"
37 static inline int ufs_add_nondir(struct dentry *dentry, struct inode *inode)
38 {
39 int err = ufs_add_link(dentry, inode);
40 if (!err) {
41 d_instantiate(dentry, inode);
42 return 0;
43 }
44 inode_dec_link_count(inode);
45 iput(inode);
46 return err;
47 }
49 static struct dentry *ufs_lookup(struct inode * dir, struct dentry *dentry, struct nameidata *nd)
50 {
51 struct inode * inode = NULL;
52 ino_t ino;
54 if (dentry->d_name.len > UFS_MAXNAMLEN)
55 return ERR_PTR(-ENAMETOOLONG);
57 lock_kernel();
58 ino = ufs_inode_by_name(dir, dentry);
59 if (ino) {
60 inode = iget(dir->i_sb, ino);
61 if (!inode) {
62 unlock_kernel();
63 return ERR_PTR(-EACCES);
64 }
65 }
66 unlock_kernel();
67 d_add(dentry, inode);
68 return NULL;
69 }
71 /*
72 * By the time this is called, we already have created
73 * the directory cache entry for the new file, but it
74 * is so far negative - it has no inode.
75 *
76 * If the create succeeds, we fill in the inode information
77 * with d_instantiate().
78 */
79 static int ufs_create (struct inode * dir, struct dentry * dentry, int mode,
80 struct nameidata *nd)
81 {
82 struct inode *inode;
83 int err;
85 UFSD("BEGIN\n");
86 inode = ufs_new_inode(dir, mode);
87 err = PTR_ERR(inode);
89 if (!IS_ERR(inode)) {
90 inode->i_op = &ufs_file_inode_operations;
91 inode->i_fop = &ufs_file_operations;
92 inode->i_mapping->a_ops = &ufs_aops;
93 mark_inode_dirty(inode);
94 lock_kernel();
95 err = ufs_add_nondir(dentry, inode);
96 unlock_kernel();
97 }
98 UFSD("END: err=%d\n", err);
99 return err;
100 }
102 static int ufs_mknod (struct inode * dir, struct dentry *dentry, int mode, dev_t rdev)
103 {
104 struct inode *inode;
105 int err;
107 if (!old_valid_dev(rdev))
108 return -EINVAL;
109 inode = ufs_new_inode(dir, mode);
110 err = PTR_ERR(inode);
111 if (!IS_ERR(inode)) {
112 init_special_inode(inode, mode, rdev);
113 /* NOTE: that'll go when we get wide dev_t */
114 ufs_set_inode_dev(inode->i_sb, UFS_I(inode), rdev);
115 mark_inode_dirty(inode);
116 lock_kernel();
117 err = ufs_add_nondir(dentry, inode);
118 unlock_kernel();
119 }
120 return err;
121 }
123 static int ufs_symlink (struct inode * dir, struct dentry * dentry,
124 const char * symname)
125 {
126 struct super_block * sb = dir->i_sb;
127 int err = -ENAMETOOLONG;
128 unsigned l = strlen(symname)+1;
129 struct inode * inode;
131 if (l > sb->s_blocksize)
132 goto out_notlocked;
134 lock_kernel();
135 inode = ufs_new_inode(dir, S_IFLNK | S_IRWXUGO);
136 err = PTR_ERR(inode);
137 if (IS_ERR(inode))
138 goto out;
140 if (l > UFS_SB(sb)->s_uspi->s_maxsymlinklen) {
141 /* slow symlink */
142 inode->i_op = &page_symlink_inode_operations;
143 inode->i_mapping->a_ops = &ufs_aops;
144 err = page_symlink(inode, symname, l);
145 if (err)
146 goto out_fail;
147 } else {
148 /* fast symlink */
149 inode->i_op = &ufs_fast_symlink_inode_operations;
150 memcpy((char*)&UFS_I(inode)->i_u1.i_data,symname,l);
151 inode->i_size = l-1;
152 }
153 mark_inode_dirty(inode);
155 err = ufs_add_nondir(dentry, inode);
156 out:
157 unlock_kernel();
158 out_notlocked:
159 return err;
161 out_fail:
162 inode_dec_link_count(inode);
163 iput(inode);
164 goto out;
165 }
167 static int ufs_link (struct dentry * old_dentry, struct inode * dir,
168 struct dentry *dentry)
169 {
170 struct inode *inode = old_dentry->d_inode;
171 int error;
173 lock_kernel();
174 if (inode->i_nlink >= UFS_LINK_MAX) {
175 unlock_kernel();
176 return -EMLINK;
177 }
179 inode->i_ctime = CURRENT_TIME_SEC;
180 inode_inc_link_count(inode);
181 atomic_inc(&inode->i_count);
183 error = ufs_add_nondir(dentry, inode);
184 unlock_kernel();
185 return error;
186 }
188 static int ufs_mkdir(struct inode * dir, struct dentry * dentry, int mode)
189 {
190 struct inode * inode;
191 int err = -EMLINK;
193 if (dir->i_nlink >= UFS_LINK_MAX)
194 goto out;
196 lock_kernel();
197 inode_inc_link_count(dir);
199 inode = ufs_new_inode(dir, S_IFDIR|mode);
200 err = PTR_ERR(inode);
201 if (IS_ERR(inode))
202 goto out_dir;
204 inode->i_op = &ufs_dir_inode_operations;
205 inode->i_fop = &ufs_dir_operations;
206 inode->i_mapping->a_ops = &ufs_aops;
208 inode_inc_link_count(inode);
210 err = ufs_make_empty(inode, dir);
211 if (err)
212 goto out_fail;
214 err = ufs_add_link(dentry, inode);
215 if (err)
216 goto out_fail;
217 unlock_kernel();
219 d_instantiate(dentry, inode);
220 out:
221 return err;
223 out_fail:
224 inode_dec_link_count(inode);
225 inode_dec_link_count(inode);
226 iput (inode);
227 out_dir:
228 inode_dec_link_count(dir);
229 unlock_kernel();
230 goto out;
231 }
233 static int ufs_unlink(struct inode *dir, struct dentry *dentry)
234 {
235 struct inode * inode = dentry->d_inode;
236 struct ufs_dir_entry *de;
237 struct page *page;
238 int err = -ENOENT;
240 de = ufs_find_entry(dir, dentry, &page);
241 if (!de)
242 goto out;
244 err = ufs_delete_entry(dir, de, page);
245 if (err)
246 goto out;
248 inode->i_ctime = dir->i_ctime;
249 inode_dec_link_count(inode);
250 err = 0;
251 out:
252 return err;
253 }
255 static int ufs_rmdir (struct inode * dir, struct dentry *dentry)
256 {
257 struct inode * inode = dentry->d_inode;
258 int err= -ENOTEMPTY;
260 lock_kernel();
261 if (ufs_empty_dir (inode)) {
262 err = ufs_unlink(dir, dentry);
263 if (!err) {
264 inode->i_size = 0;
265 inode_dec_link_count(inode);
266 inode_dec_link_count(dir);
267 }
268 }
269 unlock_kernel();
270 return err;
271 }
273 static int ufs_rename(struct inode *old_dir, struct dentry *old_dentry,
274 struct inode *new_dir, struct dentry *new_dentry)
275 {
276 struct inode *old_inode = old_dentry->d_inode;
277 struct inode *new_inode = new_dentry->d_inode;
278 struct page *dir_page = NULL;
279 struct ufs_dir_entry * dir_de = NULL;
280 struct page *old_page;
281 struct ufs_dir_entry *old_de;
282 int err = -ENOENT;
284 old_de = ufs_find_entry(old_dir, old_dentry, &old_page);
285 if (!old_de)
286 goto out;
288 if (S_ISDIR(old_inode->i_mode)) {
289 err = -EIO;
290 dir_de = ufs_dotdot(old_inode, &dir_page);
291 if (!dir_de)
292 goto out_old;
293 }
295 if (new_inode) {
296 struct page *new_page;
297 struct ufs_dir_entry *new_de;
299 err = -ENOTEMPTY;
300 if (dir_de && !ufs_empty_dir(new_inode))
301 goto out_dir;
303 err = -ENOENT;
304 new_de = ufs_find_entry(new_dir, new_dentry, &new_page);
305 if (!new_de)
306 goto out_dir;
307 inode_inc_link_count(old_inode);
308 ufs_set_link(new_dir, new_de, new_page, old_inode);
309 new_inode->i_ctime = CURRENT_TIME_SEC;
310 if (dir_de)
311 new_inode->i_nlink--;
312 inode_dec_link_count(new_inode);
313 } else {
314 if (dir_de) {
315 err = -EMLINK;
316 if (new_dir->i_nlink >= UFS_LINK_MAX)
317 goto out_dir;
318 }
319 inode_inc_link_count(old_inode);
320 err = ufs_add_link(new_dentry, old_inode);
321 if (err) {
322 inode_dec_link_count(old_inode);
323 goto out_dir;
324 }
325 if (dir_de)
326 inode_inc_link_count(new_dir);
327 }
329 /*
330 * Like most other Unix systems, set the ctime for inodes on a
331 * rename.
332 * inode_dec_link_count() will mark the inode dirty.
333 */
334 old_inode->i_ctime = CURRENT_TIME_SEC;
336 ufs_delete_entry(old_dir, old_de, old_page);
337 inode_dec_link_count(old_inode);
339 if (dir_de) {
340 ufs_set_link(old_inode, dir_de, dir_page, new_dir);
341 inode_dec_link_count(old_dir);
342 }
343 return 0;
346 out_dir:
347 if (dir_de) {
348 kunmap(dir_page);
349 page_cache_release(dir_page);
350 }
351 out_old:
352 kunmap(old_page);
353 page_cache_release(old_page);
354 out:
355 return err;
356 }
358 struct inode_operations ufs_dir_inode_operations = {
359 .create = ufs_create,
360 .lookup = ufs_lookup,
361 .link = ufs_link,
362 .unlink = ufs_unlink,
363 .symlink = ufs_symlink,
364 .mkdir = ufs_mkdir,
365 .rmdir = ufs_rmdir,
366 .mknod = ufs_mknod,
367 .rename = ufs_rename,
368 };