blob: 177515829062d82aed7dcdce9bda390535804614 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001
2/*
3 * Directory operations for Coda filesystem
4 * Original version: (C) 1996 P. Braam and M. Callahan
5 * Rewritten for Linux 2.1. (C) 1997 Carnegie Mellon University
6 *
7 * Carnegie Mellon encourages users to contribute improvements to
8 * the Coda project. Contact Peter Braam (coda@cs.cmu.edu).
9 */
10
11#include <linux/types.h>
12#include <linux/kernel.h>
13#include <linux/time.h>
14#include <linux/fs.h>
Tejun Heo5a0e3ad2010-03-24 17:04:11 +090015#include <linux/slab.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070016#include <linux/file.h>
17#include <linux/stat.h>
18#include <linux/errno.h>
19#include <linux/string.h>
Yoshihisa Abeb5ce1d82010-10-25 02:03:44 -040020#include <linux/spinlock.h>
Nick Piggin34286d62011-01-07 17:49:57 +110021#include <linux/namei.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070022
23#include <asm/uaccess.h>
24
25#include <linux/coda.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include <linux/coda_psdev.h>
Al Viro31a203d2011-01-12 16:36:09 -050027#include "coda_linux.h"
28#include "coda_cache.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070029
Adrian Bunkc98d8cf2006-03-24 03:15:53 -080030#include "coda_int.h"
31
Linus Torvalds1da177e2005-04-16 15:20:36 -070032/* dir inode-ops */
Al Viro4acdaf22011-07-26 01:42:34 -040033static int coda_create(struct inode *dir, struct dentry *new, umode_t mode, struct nameidata *nd);
Linus Torvalds1da177e2005-04-16 15:20:36 -070034static struct dentry *coda_lookup(struct inode *dir, struct dentry *target, struct nameidata *nd);
35static int coda_link(struct dentry *old_dentry, struct inode *dir_inode,
36 struct dentry *entry);
37static int coda_unlink(struct inode *dir_inode, struct dentry *entry);
38static int coda_symlink(struct inode *dir_inode, struct dentry *entry,
39 const char *symname);
Al Viro18bb1db2011-07-26 01:41:39 -040040static int coda_mkdir(struct inode *dir_inode, struct dentry *entry, umode_t mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070041static int coda_rmdir(struct inode *dir_inode, struct dentry *entry);
42static int coda_rename(struct inode *old_inode, struct dentry *old_dentry,
43 struct inode *new_inode, struct dentry *new_dentry);
44
45/* dir file-ops */
Jan Harkes97875252007-07-19 01:48:47 -070046static int coda_readdir(struct file *file, void *buf, filldir_t filldir);
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
48/* dentry ops */
49static int coda_dentry_revalidate(struct dentry *de, struct nameidata *nd);
Nick Pigginfe15ce42011-01-07 17:49:23 +110050static int coda_dentry_delete(const struct dentry *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070051
52/* support routines */
Jan Harkes97875252007-07-19 01:48:47 -070053static int coda_venus_readdir(struct file *coda_file, void *buf,
54 filldir_t filldir);
Linus Torvalds1da177e2005-04-16 15:20:36 -070055
56/* same as fs/bad_inode.c */
57static int coda_return_EIO(void)
58{
59 return -EIO;
60}
61#define CODA_EIO_ERROR ((void *) (coda_return_EIO))
62
Al Viro9501e4c2011-01-12 16:25:02 -050063const struct dentry_operations coda_dentry_operations =
Linus Torvalds1da177e2005-04-16 15:20:36 -070064{
65 .d_revalidate = coda_dentry_revalidate,
66 .d_delete = coda_dentry_delete,
67};
68
Arjan van de Ven754661f2007-02-12 00:55:38 -080069const struct inode_operations coda_dir_inode_operations =
Linus Torvalds1da177e2005-04-16 15:20:36 -070070{
71 .create = coda_create,
72 .lookup = coda_lookup,
73 .link = coda_link,
74 .unlink = coda_unlink,
75 .symlink = coda_symlink,
76 .mkdir = coda_mkdir,
77 .rmdir = coda_rmdir,
78 .mknod = CODA_EIO_ERROR,
79 .rename = coda_rename,
80 .permission = coda_permission,
81 .getattr = coda_getattr,
82 .setattr = coda_setattr,
83};
84
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -080085const struct file_operations coda_dir_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 .llseek = generic_file_llseek,
87 .read = generic_read_dir,
88 .readdir = coda_readdir,
89 .open = coda_open,
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 .release = coda_release,
91 .fsync = coda_fsync,
92};
93
94
95/* inode operations for directories */
96/* access routines: lookup, readlink, permission */
97static struct dentry *coda_lookup(struct inode *dir, struct dentry *entry, struct nameidata *nd)
98{
Al Virof4947fb2012-01-10 11:11:49 -050099 struct super_block *sb = dir->i_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 const char *name = entry->d_name.name;
101 size_t length = entry->d_name.len;
Al Virof4947fb2012-01-10 11:11:49 -0500102 struct inode *inode;
103 int type = 0;
Jan Harkesed36f722007-07-19 01:48:49 -0700104
105 if (length > CODA_MAXNAMLEN) {
106 printk(KERN_ERR "name too long: lookup, %s (%*s)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700107 coda_i2s(dir), (int)length, name);
108 return ERR_PTR(-ENAMETOOLONG);
109 }
110
Jan Harkesed36f722007-07-19 01:48:49 -0700111 /* control object, create inode on the fly */
112 if (coda_isroot(dir) && coda_iscontrol(name, length)) {
Al Virof4947fb2012-01-10 11:11:49 -0500113 inode = coda_cnode_makectl(sb);
Jan Harkesed36f722007-07-19 01:48:49 -0700114 type = CODA_NOCACHE;
Al Virof4947fb2012-01-10 11:11:49 -0500115 } else {
116 struct CodaFid fid = { { 0, } };
117 int error = venus_lookup(sb, coda_i2f(dir), name, length,
118 &type, &fid);
119 inode = !error ? coda_cnode_make(&fid, sb) : ERR_PTR(error);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700120 }
121
Al Virof4947fb2012-01-10 11:11:49 -0500122 if (!IS_ERR(inode) && (type & CODA_NOCACHE))
Jan Harkesed36f722007-07-19 01:48:49 -0700123 coda_flag_inode(inode, C_VATTR | C_PURGE);
124
Al Virof4947fb2012-01-10 11:11:49 -0500125 if (inode == ERR_PTR(-ENOENT))
126 inode = NULL;
127
Jan Harkesed36f722007-07-19 01:48:49 -0700128 return d_splice_alias(inode, entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700129}
130
131
Al Viro10556cb2011-06-20 19:28:19 -0400132int coda_permission(struct inode *inode, int mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700133{
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400134 int error;
Al Viroe6305c42008-07-15 21:03:57 -0400135
Al Viro10556cb2011-06-20 19:28:19 -0400136 if (mask & MAY_NOT_BLOCK)
Nick Pigginb74c79e2011-01-07 17:49:58 +1100137 return -ECHILD;
138
Al Viroe6305c42008-07-15 21:03:57 -0400139 mask &= MAY_READ | MAY_WRITE | MAY_EXEC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140
141 if (!mask)
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400142 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143
Miklos Szeredif696a362008-07-31 13:41:58 +0200144 if ((mask & MAY_EXEC) && !execute_ok(inode))
145 return -EACCES;
146
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147 if (coda_cache_check(inode, mask))
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400148 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400150 error = venus_access(inode->i_sb, coda_i2f(inode), mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151
152 if (!error)
153 coda_cache_enter(inode, mask);
154
Jan Harkesd7289002007-07-19 01:48:43 -0700155 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700156}
157
158
Jan Harkesd7289002007-07-19 01:48:43 -0700159static inline void coda_dir_update_mtime(struct inode *dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700160{
161#ifdef REQUERY_VENUS_FOR_MTIME
162 /* invalidate the directory cnode's attributes so we refetch the
163 * attributes from venus next time the inode is referenced */
164 coda_flag_inode(dir, C_VATTR);
165#else
166 /* optimistically we can also act as if our nose bleeds. The
Jan Harkesd7289002007-07-19 01:48:43 -0700167 * granularity of the mtime is coarse anyways so we might actually be
168 * right most of the time. Note: we only do this for directories. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700169 dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
170#endif
Jan Harkesd7289002007-07-19 01:48:43 -0700171}
172
173/* we have to wrap inc_nlink/drop_nlink because sometimes userspace uses a
174 * trick to fool GNU find's optimizations. If we can't be sure of the link
175 * (because of volume mount points) we set i_nlink to 1 which forces find
176 * to consider every child as a possible directory. We should also never
177 * see an increment or decrement for deleted directories where i_nlink == 0 */
178static inline void coda_dir_inc_nlink(struct inode *dir)
179{
180 if (dir->i_nlink >= 2)
181 inc_nlink(dir);
182}
183
184static inline void coda_dir_drop_nlink(struct inode *dir)
185{
186 if (dir->i_nlink > 2)
187 drop_nlink(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188}
189
190/* creation routines: create, mknod, mkdir, link, symlink */
Al Viro4acdaf22011-07-26 01:42:34 -0400191static int coda_create(struct inode *dir, struct dentry *de, umode_t mode, struct nameidata *nd)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192{
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400193 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 const char *name=de->d_name.name;
195 int length=de->d_name.len;
196 struct inode *inode;
197 struct CodaFid newfid;
198 struct coda_vattr attrs;
199
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400200 if (coda_isroot(dir) && coda_iscontrol(name, length))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700202
203 error = venus_create(dir->i_sb, coda_i2f(dir), name, length,
204 0, mode, &newfid, &attrs);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400205 if (error)
206 goto err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207
208 inode = coda_iget(dir->i_sb, &newfid, &attrs);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400209 if (IS_ERR(inode)) {
210 error = PTR_ERR(inode);
211 goto err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212 }
213
214 /* invalidate the directory cnode's attributes */
Jan Harkesd7289002007-07-19 01:48:43 -0700215 coda_dir_update_mtime(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 d_instantiate(de, inode);
Jan Harkesd7289002007-07-19 01:48:43 -0700217 return 0;
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400218err_out:
219 d_drop(de);
220 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221}
222
Al Viro18bb1db2011-07-26 01:41:39 -0400223static int coda_mkdir(struct inode *dir, struct dentry *de, umode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224{
225 struct inode *inode;
226 struct coda_vattr attrs;
227 const char *name = de->d_name.name;
228 int len = de->d_name.len;
229 int error;
230 struct CodaFid newfid;
231
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400232 if (coda_isroot(dir) && coda_iscontrol(name, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700234
235 attrs.va_mode = mode;
236 error = venus_mkdir(dir->i_sb, coda_i2f(dir),
237 name, len, &newfid, &attrs);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400238 if (error)
239 goto err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240
241 inode = coda_iget(dir->i_sb, &newfid, &attrs);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400242 if (IS_ERR(inode)) {
243 error = PTR_ERR(inode);
244 goto err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 }
Jan Harkesd7289002007-07-19 01:48:43 -0700246
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 /* invalidate the directory cnode's attributes */
Jan Harkesd7289002007-07-19 01:48:43 -0700248 coda_dir_inc_nlink(dir);
249 coda_dir_update_mtime(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700250 d_instantiate(de, inode);
Jan Harkesd7289002007-07-19 01:48:43 -0700251 return 0;
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400252err_out:
253 d_drop(de);
254 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255}
256
257/* try to make de an entry in dir_inodde linked to source_de */
258static int coda_link(struct dentry *source_de, struct inode *dir_inode,
259 struct dentry *de)
260{
261 struct inode *inode = source_de->d_inode;
262 const char * name = de->d_name.name;
263 int len = de->d_name.len;
264 int error;
265
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400266 if (coda_isroot(dir_inode) && coda_iscontrol(name, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700268
269 error = venus_link(dir_inode->i_sb, coda_i2f(inode),
270 coda_i2f(dir_inode), (const char *)name, len);
Jan Harkesd7289002007-07-19 01:48:43 -0700271 if (error) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 d_drop(de);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400273 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 }
275
Jan Harkesd7289002007-07-19 01:48:43 -0700276 coda_dir_update_mtime(dir_inode);
Al Viro7de9c6ee2010-10-23 11:11:40 -0400277 ihold(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278 d_instantiate(de, inode);
Dave Hansend8c76e62006-09-30 23:29:04 -0700279 inc_nlink(inode);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400280 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281}
282
283
284static int coda_symlink(struct inode *dir_inode, struct dentry *de,
285 const char *symname)
286{
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400287 const char *name = de->d_name.name;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700288 int len = de->d_name.len;
289 int symlen;
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400290 int error;
Jan Harkes3cf01f22007-07-19 01:48:51 -0700291
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400292 if (coda_isroot(dir_inode) && coda_iscontrol(name, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700294
295 symlen = strlen(symname);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400296 if (symlen > CODA_MAXPATHLEN)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297 return -ENAMETOOLONG;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700298
299 /*
300 * This entry is now negative. Since we do not create
Jan Harkesd7289002007-07-19 01:48:43 -0700301 * an inode for the entry we have to drop it.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302 */
303 d_drop(de);
Jan Harkesd7289002007-07-19 01:48:43 -0700304 error = venus_symlink(dir_inode->i_sb, coda_i2f(dir_inode), name, len,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700305 symname, symlen);
306
307 /* mtime is no good anymore */
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400308 if (!error)
Jan Harkesd7289002007-07-19 01:48:43 -0700309 coda_dir_update_mtime(dir_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310
Jan Harkesd7289002007-07-19 01:48:43 -0700311 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312}
313
314/* destruction routines: unlink, rmdir */
Harvey Harrison9fe76c72008-04-29 00:58:44 -0700315static int coda_unlink(struct inode *dir, struct dentry *de)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700316{
317 int error;
318 const char *name = de->d_name.name;
319 int len = de->d_name.len;
320
Jan Harkesd7289002007-07-19 01:48:43 -0700321 error = venus_remove(dir->i_sb, coda_i2f(dir), name, len);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400322 if (error)
Jan Harkesd7289002007-07-19 01:48:43 -0700323 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700324
Jan Harkesd7289002007-07-19 01:48:43 -0700325 coda_dir_update_mtime(dir);
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700326 drop_nlink(de->d_inode);
Jan Harkesd7289002007-07-19 01:48:43 -0700327 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328}
329
Harvey Harrison9fe76c72008-04-29 00:58:44 -0700330static int coda_rmdir(struct inode *dir, struct dentry *de)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331{
332 const char *name = de->d_name.name;
333 int len = de->d_name.len;
Jan Harkes8c6d2152007-07-19 01:48:43 -0700334 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335
Linus Torvalds1da177e2005-04-16 15:20:36 -0700336 error = venus_rmdir(dir->i_sb, coda_i2f(dir), name, len);
Jan Harkes8c6d2152007-07-19 01:48:43 -0700337 if (!error) {
338 /* VFS may delete the child */
339 if (de->d_inode)
Miklos Szeredi6d6b77f2011-10-28 14:13:28 +0200340 clear_nlink(de->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700341
Jan Harkes8c6d2152007-07-19 01:48:43 -0700342 /* fix the link count of the parent */
343 coda_dir_drop_nlink(dir);
344 coda_dir_update_mtime(dir);
Jan Harkesd7289002007-07-19 01:48:43 -0700345 }
Jan Harkes8c6d2152007-07-19 01:48:43 -0700346 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347}
348
349/* rename */
Jan Harkesd7289002007-07-19 01:48:43 -0700350static int coda_rename(struct inode *old_dir, struct dentry *old_dentry,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 struct inode *new_dir, struct dentry *new_dentry)
352{
Jan Harkesd7289002007-07-19 01:48:43 -0700353 const char *old_name = old_dentry->d_name.name;
354 const char *new_name = new_dentry->d_name.name;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700355 int old_length = old_dentry->d_name.len;
356 int new_length = new_dentry->d_name.len;
Jan Harkesd7289002007-07-19 01:48:43 -0700357 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700358
Jan Harkesd7289002007-07-19 01:48:43 -0700359 error = venus_rename(old_dir->i_sb, coda_i2f(old_dir),
360 coda_i2f(new_dir), old_length, new_length,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700361 (const char *) old_name, (const char *)new_name);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400362 if (!error) {
363 if (new_dentry->d_inode) {
364 if (S_ISDIR(new_dentry->d_inode->i_mode)) {
Jan Harkesd7289002007-07-19 01:48:43 -0700365 coda_dir_drop_nlink(old_dir);
366 coda_dir_inc_nlink(new_dir);
367 }
368 coda_dir_update_mtime(old_dir);
369 coda_dir_update_mtime(new_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 coda_flag_inode(new_dentry->d_inode, C_VATTR);
371 } else {
372 coda_flag_inode(old_dir, C_VATTR);
373 coda_flag_inode(new_dir, C_VATTR);
Jan Harkesd7289002007-07-19 01:48:43 -0700374 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700376 return error;
377}
378
379
380/* file operations for directories */
Harvey Harrison9fe76c72008-04-29 00:58:44 -0700381static int coda_readdir(struct file *coda_file, void *buf, filldir_t filldir)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 struct coda_file_info *cfi;
384 struct file *host_file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 int ret;
386
387 cfi = CODA_FTOC(coda_file);
388 BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
389 host_file = cfi->cfi_container;
390
Jan Harkes97875252007-07-19 01:48:47 -0700391 if (!host_file->f_op)
392 return -ENOTDIR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393
Jan Harkes97875252007-07-19 01:48:47 -0700394 if (host_file->f_op->readdir)
395 {
396 /* potemkin case: we were handed a directory inode.
397 * We can't use vfs_readdir because we have to keep the file
398 * position in sync between the coda_file and the host_file.
399 * and as such we need grab the inode mutex. */
400 struct inode *host_inode = host_file->f_path.dentry->d_inode;
401
402 mutex_lock(&host_inode->i_mutex);
403 host_file->f_pos = coda_file->f_pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404
405 ret = -ENOENT;
406 if (!IS_DEADDIR(host_inode)) {
Jan Harkes97875252007-07-19 01:48:47 -0700407 ret = host_file->f_op->readdir(host_file, buf, filldir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700408 file_accessed(host_file);
409 }
Jan Harkes97875252007-07-19 01:48:47 -0700410
411 coda_file->f_pos = host_file->f_pos;
412 mutex_unlock(&host_inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 }
Jan Harkes97875252007-07-19 01:48:47 -0700414 else /* Venus: we must read Venus dirents from a file */
415 ret = coda_venus_readdir(coda_file, buf, filldir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416
417 return ret;
418}
419
420static inline unsigned int CDT2DT(unsigned char cdt)
421{
422 unsigned int dt;
423
424 switch(cdt) {
425 case CDT_UNKNOWN: dt = DT_UNKNOWN; break;
426 case CDT_FIFO: dt = DT_FIFO; break;
427 case CDT_CHR: dt = DT_CHR; break;
428 case CDT_DIR: dt = DT_DIR; break;
429 case CDT_BLK: dt = DT_BLK; break;
430 case CDT_REG: dt = DT_REG; break;
431 case CDT_LNK: dt = DT_LNK; break;
432 case CDT_SOCK: dt = DT_SOCK; break;
433 case CDT_WHT: dt = DT_WHT; break;
434 default: dt = DT_UNKNOWN; break;
435 }
436 return dt;
437}
438
439/* support routines */
Jan Harkes97875252007-07-19 01:48:47 -0700440static int coda_venus_readdir(struct file *coda_file, void *buf,
441 filldir_t filldir)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700442{
443 int result = 0; /* # of entries returned */
Jan Harkes97875252007-07-19 01:48:47 -0700444 struct coda_file_info *cfi;
445 struct coda_inode_info *cii;
446 struct file *host_file;
447 struct dentry *de;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700448 struct venus_dirent *vdir;
Al Viroee604982011-07-16 17:06:30 -0400449 unsigned long vdir_size = offsetof(struct venus_dirent, d_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 unsigned int type;
451 struct qstr name;
452 ino_t ino;
Jan Harkes97875252007-07-19 01:48:47 -0700453 int ret;
454
455 cfi = CODA_FTOC(coda_file);
456 BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
457 host_file = cfi->cfi_container;
458
459 de = coda_file->f_path.dentry;
460 cii = ITOC(de->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700461
Panagiotis Issarisf52720c2006-09-27 01:49:39 -0700462 vdir = kmalloc(sizeof(*vdir), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700463 if (!vdir) return -ENOMEM;
464
Al Viro5f47c7e2007-07-20 00:23:31 +0100465 if (coda_file->f_pos == 0) {
Jan Harkes97875252007-07-19 01:48:47 -0700466 ret = filldir(buf, ".", 1, 0, de->d_inode->i_ino, DT_DIR);
Al Viro5f47c7e2007-07-20 00:23:31 +0100467 if (ret < 0)
468 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 result++;
Jan Harkes97875252007-07-19 01:48:47 -0700470 coda_file->f_pos++;
Al Viro5f47c7e2007-07-20 00:23:31 +0100471 }
472 if (coda_file->f_pos == 1) {
Al Virob85fd6b2011-07-17 11:19:44 -0400473 ret = filldir(buf, "..", 2, 1, parent_ino(de), DT_DIR);
Al Viro5f47c7e2007-07-20 00:23:31 +0100474 if (ret < 0)
475 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700476 result++;
Jan Harkes97875252007-07-19 01:48:47 -0700477 coda_file->f_pos++;
Al Viro5f47c7e2007-07-20 00:23:31 +0100478 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 while (1) {
480 /* read entries from the directory file */
Jan Harkes97875252007-07-19 01:48:47 -0700481 ret = kernel_read(host_file, coda_file->f_pos - 2, (char *)vdir,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 sizeof(*vdir));
483 if (ret < 0) {
Jan Harkes97875252007-07-19 01:48:47 -0700484 printk(KERN_ERR "coda readdir: read dir %s failed %d\n",
485 coda_f2s(&cii->c_fid), ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486 break;
487 }
488 if (ret == 0) break; /* end of directory file reached */
489
490 /* catch truncated reads */
491 if (ret < vdir_size || ret < vdir_size + vdir->d_namlen) {
Jan Harkes97875252007-07-19 01:48:47 -0700492 printk(KERN_ERR "coda readdir: short read on %s\n",
493 coda_f2s(&cii->c_fid));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494 ret = -EBADF;
495 break;
496 }
497 /* validate whether the directory file actually makes sense */
498 if (vdir->d_reclen < vdir_size + vdir->d_namlen) {
Jan Harkes97875252007-07-19 01:48:47 -0700499 printk(KERN_ERR "coda readdir: invalid dir %s\n",
500 coda_f2s(&cii->c_fid));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 ret = -EBADF;
502 break;
503 }
504
505 name.len = vdir->d_namlen;
506 name.name = vdir->d_name;
507
508 /* Make sure we skip '.' and '..', we already got those */
509 if (name.name[0] == '.' && (name.len == 1 ||
510 (vdir->d_name[1] == '.' && name.len == 2)))
511 vdir->d_fileno = name.len = 0;
512
513 /* skip null entries */
514 if (vdir->d_fileno && name.len) {
515 /* try to look up this entry in the dcache, that way
516 * userspace doesn't have to worry about breaking
517 * getcwd by having mismatched inode numbers for
518 * internal volume mountpoints. */
Jan Harkes97875252007-07-19 01:48:47 -0700519 ino = find_inode_number(de, &name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700520 if (!ino) ino = vdir->d_fileno;
521
522 type = CDT2DT(vdir->d_type);
Jan Harkes97875252007-07-19 01:48:47 -0700523 ret = filldir(buf, name.name, name.len,
524 coda_file->f_pos, ino, type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700525 /* failure means no space for filling in this round */
526 if (ret < 0) break;
527 result++;
528 }
529 /* we'll always have progress because d_reclen is unsigned and
530 * we've already established it is non-zero. */
Jan Harkes97875252007-07-19 01:48:47 -0700531 coda_file->f_pos += vdir->d_reclen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 }
Al Viro5f47c7e2007-07-20 00:23:31 +0100533out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 kfree(vdir);
535 return result ? result : ret;
536}
537
538/* called when a cache lookup succeeds */
539static int coda_dentry_revalidate(struct dentry *de, struct nameidata *nd)
540{
Nick Piggin34286d62011-01-07 17:49:57 +1100541 struct inode *inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700542 struct coda_inode_info *cii;
543
Nick Piggin34286d62011-01-07 17:49:57 +1100544 if (nd->flags & LOOKUP_RCU)
545 return -ECHILD;
546
547 inode = de->d_inode;
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400548 if (!inode || coda_isroot(inode))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700549 goto out;
550 if (is_bad_inode(inode))
551 goto bad;
552
553 cii = ITOC(de->d_inode);
554 if (!(cii->c_flags & (C_PURGE | C_FLUSH)))
555 goto out;
556
557 shrink_dcache_parent(de);
558
559 /* propagate for a flush */
560 if (cii->c_flags & C_FLUSH)
561 coda_flag_inode_children(inode, C_FLUSH);
562
Nick Pigginb7ab39f2011-01-07 17:49:32 +1100563 if (de->d_count > 1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700564 /* pretend it's valid, but don't change the flags */
565 goto out;
566
567 /* clear the flags. */
Yoshihisa Abeb5ce1d82010-10-25 02:03:44 -0400568 spin_lock(&cii->c_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569 cii->c_flags &= ~(C_VATTR | C_PURGE | C_FLUSH);
Yoshihisa Abeb5ce1d82010-10-25 02:03:44 -0400570 spin_unlock(&cii->c_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571bad:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572 return 0;
573out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700574 return 1;
575}
576
577/*
578 * This is the callback from dput() when d_count is going to 0.
579 * We use this to unhash dentries with bad inodes.
580 */
Nick Pigginfe15ce42011-01-07 17:49:23 +1100581static int coda_dentry_delete(const struct dentry * dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700582{
583 int flags;
584
585 if (!dentry->d_inode)
586 return 0;
587
588 flags = (ITOC(dentry->d_inode)->c_flags) & C_PURGE;
589 if (is_bad_inode(dentry->d_inode) || flags) {
590 return 1;
591 }
592 return 0;
593}
594
595
596
597/*
598 * This is called when we want to check if the inode has
599 * changed on the server. Coda makes this easy since the
600 * cache manager Venus issues a downcall to the kernel when this
601 * happens
602 */
603int coda_revalidate_inode(struct dentry *dentry)
604{
605 struct coda_vattr attr;
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400606 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607 int old_mode;
608 ino_t old_ino;
609 struct inode *inode = dentry->d_inode;
610 struct coda_inode_info *cii = ITOC(inode);
611
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400612 if (!cii->c_flags)
613 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700614
615 if (cii->c_flags & (C_VATTR | C_PURGE | C_FLUSH)) {
616 error = venus_getattr(inode->i_sb, &(cii->c_fid), &attr);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400617 if (error)
618 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700619
620 /* this inode may be lost if:
621 - it's ino changed
622 - type changes must be permitted for repair and
623 missing mount points.
624 */
625 old_mode = inode->i_mode;
626 old_ino = inode->i_ino;
627 coda_vattr_to_iattr(inode, &attr);
628
629 if ((old_mode & S_IFMT) != (inode->i_mode & S_IFMT)) {
630 printk("Coda: inode %ld, fid %s changed type!\n",
631 inode->i_ino, coda_f2s(&(cii->c_fid)));
632 }
633
634 /* the following can happen when a local fid is replaced
635 with a global one, here we lose and declare the inode bad */
636 if (inode->i_ino != old_ino)
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400637 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700638
639 coda_flag_inode_children(inode, C_FLUSH);
Yoshihisa Abeb5ce1d82010-10-25 02:03:44 -0400640
641 spin_lock(&cii->c_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700642 cii->c_flags &= ~(C_VATTR | C_PURGE | C_FLUSH);
Yoshihisa Abeb5ce1d82010-10-25 02:03:44 -0400643 spin_unlock(&cii->c_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700646}