blob: 9e37e8bc9b89e83351549b6b3a9a93fb7f9d5c45 [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>
Linus Torvalds1da177e2005-04-16 15:20:36 -070021
22#include <asm/uaccess.h>
23
24#include <linux/coda.h>
25#include <linux/coda_linux.h>
26#include <linux/coda_psdev.h>
27#include <linux/coda_fs_i.h>
28#include <linux/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 */
33static int coda_create(struct inode *dir, struct dentry *new, int mode, struct nameidata *nd);
34static 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);
40static int coda_mkdir(struct inode *dir_inode, struct dentry *entry, int mode);
41static 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 Viroe16404e2009-02-20 05:55:13 +000063static const 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{
Jan Harkesed36f722007-07-19 01:48:49 -070099 struct inode *inode = NULL;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 struct CodaFid resfid = { { 0, } };
Linus Torvalds1da177e2005-04-16 15:20:36 -0700101 int type = 0;
102 int error = 0;
103 const char *name = entry->d_name.name;
104 size_t length = entry->d_name.len;
Jan Harkesed36f722007-07-19 01:48:49 -0700105
106 if (length > CODA_MAXNAMLEN) {
107 printk(KERN_ERR "name too long: lookup, %s (%*s)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108 coda_i2s(dir), (int)length, name);
109 return ERR_PTR(-ENAMETOOLONG);
110 }
111
Jan Harkesed36f722007-07-19 01:48:49 -0700112 /* control object, create inode on the fly */
113 if (coda_isroot(dir) && coda_iscontrol(name, length)) {
114 error = coda_cnode_makectl(&inode, dir->i_sb);
115 type = CODA_NOCACHE;
116 goto exit;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700117 }
118
Jan Harkesed36f722007-07-19 01:48:49 -0700119 error = venus_lookup(dir->i_sb, coda_i2f(dir), name, length,
120 &type, &resfid);
121 if (!error)
122 error = coda_cnode_make(&inode, &resfid, dir->i_sb);
123
Jan Harkesed36f722007-07-19 01:48:49 -0700124 if (error && error != -ENOENT)
125 return ERR_PTR(error);
126
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127exit:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 entry->d_op = &coda_dentry_operations;
Jan Harkesed36f722007-07-19 01:48:49 -0700129
130 if (inode && (type & CODA_NOCACHE))
131 coda_flag_inode(inode, C_VATTR | C_PURGE);
132
133 return d_splice_alias(inode, entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134}
135
136
Al Viroe6305c42008-07-15 21:03:57 -0400137int coda_permission(struct inode *inode, int mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138{
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400139 int error;
Al Viroe6305c42008-07-15 21:03:57 -0400140
141 mask &= MAY_READ | MAY_WRITE | MAY_EXEC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142
143 if (!mask)
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400144 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145
Miklos Szeredif696a362008-07-31 13:41:58 +0200146 if ((mask & MAY_EXEC) && !execute_ok(inode))
147 return -EACCES;
148
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149 if (coda_cache_check(inode, mask))
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400150 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400152 error = venus_access(inode->i_sb, coda_i2f(inode), mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700153
154 if (!error)
155 coda_cache_enter(inode, mask);
156
Jan Harkesd7289002007-07-19 01:48:43 -0700157 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158}
159
160
Jan Harkesd7289002007-07-19 01:48:43 -0700161static inline void coda_dir_update_mtime(struct inode *dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162{
163#ifdef REQUERY_VENUS_FOR_MTIME
164 /* invalidate the directory cnode's attributes so we refetch the
165 * attributes from venus next time the inode is referenced */
166 coda_flag_inode(dir, C_VATTR);
167#else
168 /* optimistically we can also act as if our nose bleeds. The
Jan Harkesd7289002007-07-19 01:48:43 -0700169 * granularity of the mtime is coarse anyways so we might actually be
170 * right most of the time. Note: we only do this for directories. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700171 dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
172#endif
Jan Harkesd7289002007-07-19 01:48:43 -0700173}
174
175/* we have to wrap inc_nlink/drop_nlink because sometimes userspace uses a
176 * trick to fool GNU find's optimizations. If we can't be sure of the link
177 * (because of volume mount points) we set i_nlink to 1 which forces find
178 * to consider every child as a possible directory. We should also never
179 * see an increment or decrement for deleted directories where i_nlink == 0 */
180static inline void coda_dir_inc_nlink(struct inode *dir)
181{
182 if (dir->i_nlink >= 2)
183 inc_nlink(dir);
184}
185
186static inline void coda_dir_drop_nlink(struct inode *dir)
187{
188 if (dir->i_nlink > 2)
189 drop_nlink(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190}
191
192/* creation routines: create, mknod, mkdir, link, symlink */
193static int coda_create(struct inode *dir, struct dentry *de, int mode, struct nameidata *nd)
194{
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400195 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700196 const char *name=de->d_name.name;
197 int length=de->d_name.len;
198 struct inode *inode;
199 struct CodaFid newfid;
200 struct coda_vattr attrs;
201
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400202 if (coda_isroot(dir) && coda_iscontrol(name, length))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204
205 error = venus_create(dir->i_sb, coda_i2f(dir), name, length,
206 0, mode, &newfid, &attrs);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400207 if (error)
208 goto err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209
210 inode = coda_iget(dir->i_sb, &newfid, &attrs);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400211 if (IS_ERR(inode)) {
212 error = PTR_ERR(inode);
213 goto err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 }
215
216 /* invalidate the directory cnode's attributes */
Jan Harkesd7289002007-07-19 01:48:43 -0700217 coda_dir_update_mtime(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700218 d_instantiate(de, inode);
Jan Harkesd7289002007-07-19 01:48:43 -0700219 return 0;
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400220err_out:
221 d_drop(de);
222 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223}
224
225static int coda_mkdir(struct inode *dir, struct dentry *de, int mode)
226{
227 struct inode *inode;
228 struct coda_vattr attrs;
229 const char *name = de->d_name.name;
230 int len = de->d_name.len;
231 int error;
232 struct CodaFid newfid;
233
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400234 if (coda_isroot(dir) && coda_iscontrol(name, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700235 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236
237 attrs.va_mode = mode;
238 error = venus_mkdir(dir->i_sb, coda_i2f(dir),
239 name, len, &newfid, &attrs);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400240 if (error)
241 goto err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700242
243 inode = coda_iget(dir->i_sb, &newfid, &attrs);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400244 if (IS_ERR(inode)) {
245 error = PTR_ERR(inode);
246 goto err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700247 }
Jan Harkesd7289002007-07-19 01:48:43 -0700248
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 /* invalidate the directory cnode's attributes */
Jan Harkesd7289002007-07-19 01:48:43 -0700250 coda_dir_inc_nlink(dir);
251 coda_dir_update_mtime(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700252 d_instantiate(de, inode);
Jan Harkesd7289002007-07-19 01:48:43 -0700253 return 0;
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400254err_out:
255 d_drop(de);
256 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700257}
258
259/* try to make de an entry in dir_inodde linked to source_de */
260static int coda_link(struct dentry *source_de, struct inode *dir_inode,
261 struct dentry *de)
262{
263 struct inode *inode = source_de->d_inode;
264 const char * name = de->d_name.name;
265 int len = de->d_name.len;
266 int error;
267
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400268 if (coda_isroot(dir_inode) && coda_iscontrol(name, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700269 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270
271 error = venus_link(dir_inode->i_sb, coda_i2f(inode),
272 coda_i2f(dir_inode), (const char *)name, len);
Jan Harkesd7289002007-07-19 01:48:43 -0700273 if (error) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274 d_drop(de);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400275 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 }
277
Jan Harkesd7289002007-07-19 01:48:43 -0700278 coda_dir_update_mtime(dir_inode);
Al Viro7de9c6ee2010-10-23 11:11:40 -0400279 ihold(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280 d_instantiate(de, inode);
Dave Hansend8c76e62006-09-30 23:29:04 -0700281 inc_nlink(inode);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400282 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700283}
284
285
286static int coda_symlink(struct inode *dir_inode, struct dentry *de,
287 const char *symname)
288{
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400289 const char *name = de->d_name.name;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290 int len = de->d_name.len;
291 int symlen;
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400292 int error;
Jan Harkes3cf01f22007-07-19 01:48:51 -0700293
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400294 if (coda_isroot(dir_inode) && coda_iscontrol(name, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296
297 symlen = strlen(symname);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400298 if (symlen > CODA_MAXPATHLEN)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 return -ENAMETOOLONG;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300
301 /*
302 * This entry is now negative. Since we do not create
Jan Harkesd7289002007-07-19 01:48:43 -0700303 * an inode for the entry we have to drop it.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 */
305 d_drop(de);
Jan Harkesd7289002007-07-19 01:48:43 -0700306 error = venus_symlink(dir_inode->i_sb, coda_i2f(dir_inode), name, len,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700307 symname, symlen);
308
309 /* mtime is no good anymore */
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400310 if (!error)
Jan Harkesd7289002007-07-19 01:48:43 -0700311 coda_dir_update_mtime(dir_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700312
Jan Harkesd7289002007-07-19 01:48:43 -0700313 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314}
315
316/* destruction routines: unlink, rmdir */
Harvey Harrison9fe76c72008-04-29 00:58:44 -0700317static int coda_unlink(struct inode *dir, struct dentry *de)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318{
319 int error;
320 const char *name = de->d_name.name;
321 int len = de->d_name.len;
322
Jan Harkesd7289002007-07-19 01:48:43 -0700323 error = venus_remove(dir->i_sb, coda_i2f(dir), name, len);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400324 if (error)
Jan Harkesd7289002007-07-19 01:48:43 -0700325 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326
Jan Harkesd7289002007-07-19 01:48:43 -0700327 coda_dir_update_mtime(dir);
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700328 drop_nlink(de->d_inode);
Jan Harkesd7289002007-07-19 01:48:43 -0700329 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330}
331
Harvey Harrison9fe76c72008-04-29 00:58:44 -0700332static int coda_rmdir(struct inode *dir, struct dentry *de)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333{
334 const char *name = de->d_name.name;
335 int len = de->d_name.len;
Jan Harkes8c6d2152007-07-19 01:48:43 -0700336 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337
Linus Torvalds1da177e2005-04-16 15:20:36 -0700338 error = venus_rmdir(dir->i_sb, coda_i2f(dir), name, len);
Jan Harkes8c6d2152007-07-19 01:48:43 -0700339 if (!error) {
340 /* VFS may delete the child */
341 if (de->d_inode)
342 de->d_inode->i_nlink = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343
Jan Harkes8c6d2152007-07-19 01:48:43 -0700344 /* fix the link count of the parent */
345 coda_dir_drop_nlink(dir);
346 coda_dir_update_mtime(dir);
Jan Harkesd7289002007-07-19 01:48:43 -0700347 }
Jan Harkes8c6d2152007-07-19 01:48:43 -0700348 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349}
350
351/* rename */
Jan Harkesd7289002007-07-19 01:48:43 -0700352static int coda_rename(struct inode *old_dir, struct dentry *old_dentry,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 struct inode *new_dir, struct dentry *new_dentry)
354{
Jan Harkesd7289002007-07-19 01:48:43 -0700355 const char *old_name = old_dentry->d_name.name;
356 const char *new_name = new_dentry->d_name.name;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 int old_length = old_dentry->d_name.len;
358 int new_length = new_dentry->d_name.len;
Jan Harkesd7289002007-07-19 01:48:43 -0700359 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360
Jan Harkesd7289002007-07-19 01:48:43 -0700361 error = venus_rename(old_dir->i_sb, coda_i2f(old_dir),
362 coda_i2f(new_dir), old_length, new_length,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363 (const char *) old_name, (const char *)new_name);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400364 if (!error) {
365 if (new_dentry->d_inode) {
366 if (S_ISDIR(new_dentry->d_inode->i_mode)) {
Jan Harkesd7289002007-07-19 01:48:43 -0700367 coda_dir_drop_nlink(old_dir);
368 coda_dir_inc_nlink(new_dir);
369 }
370 coda_dir_update_mtime(old_dir);
371 coda_dir_update_mtime(new_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700372 coda_flag_inode(new_dentry->d_inode, C_VATTR);
373 } else {
374 coda_flag_inode(old_dir, C_VATTR);
375 coda_flag_inode(new_dir, C_VATTR);
Jan Harkesd7289002007-07-19 01:48:43 -0700376 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700378 return error;
379}
380
381
382/* file operations for directories */
Harvey Harrison9fe76c72008-04-29 00:58:44 -0700383static int coda_readdir(struct file *coda_file, void *buf, filldir_t filldir)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 struct coda_file_info *cfi;
386 struct file *host_file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387 int ret;
388
389 cfi = CODA_FTOC(coda_file);
390 BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
391 host_file = cfi->cfi_container;
392
Jan Harkes97875252007-07-19 01:48:47 -0700393 if (!host_file->f_op)
394 return -ENOTDIR;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700395
Jan Harkes97875252007-07-19 01:48:47 -0700396 if (host_file->f_op->readdir)
397 {
398 /* potemkin case: we were handed a directory inode.
399 * We can't use vfs_readdir because we have to keep the file
400 * position in sync between the coda_file and the host_file.
401 * and as such we need grab the inode mutex. */
402 struct inode *host_inode = host_file->f_path.dentry->d_inode;
403
404 mutex_lock(&host_inode->i_mutex);
405 host_file->f_pos = coda_file->f_pos;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700406
407 ret = -ENOENT;
408 if (!IS_DEADDIR(host_inode)) {
Jan Harkes97875252007-07-19 01:48:47 -0700409 ret = host_file->f_op->readdir(host_file, buf, filldir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 file_accessed(host_file);
411 }
Jan Harkes97875252007-07-19 01:48:47 -0700412
413 coda_file->f_pos = host_file->f_pos;
414 mutex_unlock(&host_inode->i_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700415 }
Jan Harkes97875252007-07-19 01:48:47 -0700416 else /* Venus: we must read Venus dirents from a file */
417 ret = coda_venus_readdir(coda_file, buf, filldir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418
419 return ret;
420}
421
422static inline unsigned int CDT2DT(unsigned char cdt)
423{
424 unsigned int dt;
425
426 switch(cdt) {
427 case CDT_UNKNOWN: dt = DT_UNKNOWN; break;
428 case CDT_FIFO: dt = DT_FIFO; break;
429 case CDT_CHR: dt = DT_CHR; break;
430 case CDT_DIR: dt = DT_DIR; break;
431 case CDT_BLK: dt = DT_BLK; break;
432 case CDT_REG: dt = DT_REG; break;
433 case CDT_LNK: dt = DT_LNK; break;
434 case CDT_SOCK: dt = DT_SOCK; break;
435 case CDT_WHT: dt = DT_WHT; break;
436 default: dt = DT_UNKNOWN; break;
437 }
438 return dt;
439}
440
441/* support routines */
Jan Harkes97875252007-07-19 01:48:47 -0700442static int coda_venus_readdir(struct file *coda_file, void *buf,
443 filldir_t filldir)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444{
445 int result = 0; /* # of entries returned */
Jan Harkes97875252007-07-19 01:48:47 -0700446 struct coda_file_info *cfi;
447 struct coda_inode_info *cii;
448 struct file *host_file;
449 struct dentry *de;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 struct venus_dirent *vdir;
451 unsigned long vdir_size =
452 (unsigned long)(&((struct venus_dirent *)0)->d_name);
453 unsigned int type;
454 struct qstr name;
455 ino_t ino;
Jan Harkes97875252007-07-19 01:48:47 -0700456 int ret;
457
458 cfi = CODA_FTOC(coda_file);
459 BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
460 host_file = cfi->cfi_container;
461
462 de = coda_file->f_path.dentry;
463 cii = ITOC(de->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464
Panagiotis Issarisf52720c2006-09-27 01:49:39 -0700465 vdir = kmalloc(sizeof(*vdir), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 if (!vdir) return -ENOMEM;
467
Al Viro5f47c7e2007-07-20 00:23:31 +0100468 if (coda_file->f_pos == 0) {
Jan Harkes97875252007-07-19 01:48:47 -0700469 ret = filldir(buf, ".", 1, 0, de->d_inode->i_ino, DT_DIR);
Al Viro5f47c7e2007-07-20 00:23:31 +0100470 if (ret < 0)
471 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472 result++;
Jan Harkes97875252007-07-19 01:48:47 -0700473 coda_file->f_pos++;
Al Viro5f47c7e2007-07-20 00:23:31 +0100474 }
475 if (coda_file->f_pos == 1) {
Jan Harkes97875252007-07-19 01:48:47 -0700476 ret = filldir(buf, "..", 2, 1, de->d_parent->d_inode->i_ino, DT_DIR);
Al Viro5f47c7e2007-07-20 00:23:31 +0100477 if (ret < 0)
478 goto out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 result++;
Jan Harkes97875252007-07-19 01:48:47 -0700480 coda_file->f_pos++;
Al Viro5f47c7e2007-07-20 00:23:31 +0100481 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 while (1) {
483 /* read entries from the directory file */
Jan Harkes97875252007-07-19 01:48:47 -0700484 ret = kernel_read(host_file, coda_file->f_pos - 2, (char *)vdir,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700485 sizeof(*vdir));
486 if (ret < 0) {
Jan Harkes97875252007-07-19 01:48:47 -0700487 printk(KERN_ERR "coda readdir: read dir %s failed %d\n",
488 coda_f2s(&cii->c_fid), ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 break;
490 }
491 if (ret == 0) break; /* end of directory file reached */
492
493 /* catch truncated reads */
494 if (ret < vdir_size || ret < vdir_size + vdir->d_namlen) {
Jan Harkes97875252007-07-19 01:48:47 -0700495 printk(KERN_ERR "coda readdir: short read on %s\n",
496 coda_f2s(&cii->c_fid));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497 ret = -EBADF;
498 break;
499 }
500 /* validate whether the directory file actually makes sense */
501 if (vdir->d_reclen < vdir_size + vdir->d_namlen) {
Jan Harkes97875252007-07-19 01:48:47 -0700502 printk(KERN_ERR "coda readdir: invalid dir %s\n",
503 coda_f2s(&cii->c_fid));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504 ret = -EBADF;
505 break;
506 }
507
508 name.len = vdir->d_namlen;
509 name.name = vdir->d_name;
510
511 /* Make sure we skip '.' and '..', we already got those */
512 if (name.name[0] == '.' && (name.len == 1 ||
513 (vdir->d_name[1] == '.' && name.len == 2)))
514 vdir->d_fileno = name.len = 0;
515
516 /* skip null entries */
517 if (vdir->d_fileno && name.len) {
518 /* try to look up this entry in the dcache, that way
519 * userspace doesn't have to worry about breaking
520 * getcwd by having mismatched inode numbers for
521 * internal volume mountpoints. */
Jan Harkes97875252007-07-19 01:48:47 -0700522 ino = find_inode_number(de, &name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700523 if (!ino) ino = vdir->d_fileno;
524
525 type = CDT2DT(vdir->d_type);
Jan Harkes97875252007-07-19 01:48:47 -0700526 ret = filldir(buf, name.name, name.len,
527 coda_file->f_pos, ino, type);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528 /* failure means no space for filling in this round */
529 if (ret < 0) break;
530 result++;
531 }
532 /* we'll always have progress because d_reclen is unsigned and
533 * we've already established it is non-zero. */
Jan Harkes97875252007-07-19 01:48:47 -0700534 coda_file->f_pos += vdir->d_reclen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535 }
Al Viro5f47c7e2007-07-20 00:23:31 +0100536out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 kfree(vdir);
538 return result ? result : ret;
539}
540
541/* called when a cache lookup succeeds */
542static int coda_dentry_revalidate(struct dentry *de, struct nameidata *nd)
543{
544 struct inode *inode = de->d_inode;
545 struct coda_inode_info *cii;
546
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400547 if (!inode || coda_isroot(inode))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700548 goto out;
549 if (is_bad_inode(inode))
550 goto bad;
551
552 cii = ITOC(de->d_inode);
553 if (!(cii->c_flags & (C_PURGE | C_FLUSH)))
554 goto out;
555
556 shrink_dcache_parent(de);
557
558 /* propagate for a flush */
559 if (cii->c_flags & C_FLUSH)
560 coda_flag_inode_children(inode, C_FLUSH);
561
Nick Pigginb7ab39f2011-01-07 17:49:32 +1100562 if (de->d_count > 1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700563 /* pretend it's valid, but don't change the flags */
564 goto out;
565
566 /* clear the flags. */
Yoshihisa Abeb5ce1d82010-10-25 02:03:44 -0400567 spin_lock(&cii->c_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700568 cii->c_flags &= ~(C_VATTR | C_PURGE | C_FLUSH);
Yoshihisa Abeb5ce1d82010-10-25 02:03:44 -0400569 spin_unlock(&cii->c_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570bad:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 return 0;
572out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700573 return 1;
574}
575
576/*
577 * This is the callback from dput() when d_count is going to 0.
578 * We use this to unhash dentries with bad inodes.
579 */
Nick Pigginfe15ce42011-01-07 17:49:23 +1100580static int coda_dentry_delete(const struct dentry * dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581{
582 int flags;
583
584 if (!dentry->d_inode)
585 return 0;
586
587 flags = (ITOC(dentry->d_inode)->c_flags) & C_PURGE;
588 if (is_bad_inode(dentry->d_inode) || flags) {
589 return 1;
590 }
591 return 0;
592}
593
594
595
596/*
597 * This is called when we want to check if the inode has
598 * changed on the server. Coda makes this easy since the
599 * cache manager Venus issues a downcall to the kernel when this
600 * happens
601 */
602int coda_revalidate_inode(struct dentry *dentry)
603{
604 struct coda_vattr attr;
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400605 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606 int old_mode;
607 ino_t old_ino;
608 struct inode *inode = dentry->d_inode;
609 struct coda_inode_info *cii = ITOC(inode);
610
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400611 if (!cii->c_flags)
612 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700613
614 if (cii->c_flags & (C_VATTR | C_PURGE | C_FLUSH)) {
615 error = venus_getattr(inode->i_sb, &(cii->c_fid), &attr);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400616 if (error)
617 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700618
619 /* this inode may be lost if:
620 - it's ino changed
621 - type changes must be permitted for repair and
622 missing mount points.
623 */
624 old_mode = inode->i_mode;
625 old_ino = inode->i_ino;
626 coda_vattr_to_iattr(inode, &attr);
627
628 if ((old_mode & S_IFMT) != (inode->i_mode & S_IFMT)) {
629 printk("Coda: inode %ld, fid %s changed type!\n",
630 inode->i_ino, coda_f2s(&(cii->c_fid)));
631 }
632
633 /* the following can happen when a local fid is replaced
634 with a global one, here we lose and declare the inode bad */
635 if (inode->i_ino != old_ino)
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400636 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700637
638 coda_flag_inode_children(inode, C_FLUSH);
Yoshihisa Abeb5ce1d82010-10-25 02:03:44 -0400639
640 spin_lock(&cii->c_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700641 cii->c_flags &= ~(C_VATTR | C_PURGE | C_FLUSH);
Yoshihisa Abeb5ce1d82010-10-25 02:03:44 -0400642 spin_unlock(&cii->c_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700643 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700644 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700645}