blob: 5efbb5ee0adc627e53e425968287ab68334a195c [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 Viroebfc3b42012-06-10 18:05:36 -040033static int coda_create(struct inode *dir, struct dentry *new, umode_t mode, bool excl);
Al Viro00cd8dd2012-06-10 17:13:09 -040034static struct dentry *coda_lookup(struct inode *dir, struct dentry *target, unsigned int flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -070035static 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 */
Al Viroe924f252013-05-22 21:15:30 -040046static int coda_readdir(struct file *file, struct dir_context *ctx);
Linus Torvalds1da177e2005-04-16 15:20:36 -070047
48/* dentry ops */
Al Viro0b728e12012-06-10 16:03:43 -040049static int coda_dentry_revalidate(struct dentry *de, unsigned int flags);
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 */
Al Viroe924f252013-05-22 21:15:30 -040053static int coda_venus_readdir(struct file *, struct dir_context *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070054
55/* same as fs/bad_inode.c */
56static int coda_return_EIO(void)
57{
58 return -EIO;
59}
60#define CODA_EIO_ERROR ((void *) (coda_return_EIO))
61
Al Viro9501e4c2011-01-12 16:25:02 -050062const struct dentry_operations coda_dentry_operations =
Linus Torvalds1da177e2005-04-16 15:20:36 -070063{
64 .d_revalidate = coda_dentry_revalidate,
65 .d_delete = coda_dentry_delete,
66};
67
Arjan van de Ven754661f2007-02-12 00:55:38 -080068const struct inode_operations coda_dir_inode_operations =
Linus Torvalds1da177e2005-04-16 15:20:36 -070069{
70 .create = coda_create,
71 .lookup = coda_lookup,
72 .link = coda_link,
73 .unlink = coda_unlink,
74 .symlink = coda_symlink,
75 .mkdir = coda_mkdir,
76 .rmdir = coda_rmdir,
77 .mknod = CODA_EIO_ERROR,
78 .rename = coda_rename,
79 .permission = coda_permission,
80 .getattr = coda_getattr,
81 .setattr = coda_setattr,
82};
83
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -080084const struct file_operations coda_dir_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070085 .llseek = generic_file_llseek,
86 .read = generic_read_dir,
Al Viroe924f252013-05-22 21:15:30 -040087 .iterate = coda_readdir,
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 .open = coda_open,
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 .release = coda_release,
90 .fsync = coda_fsync,
91};
92
93
94/* inode operations for directories */
95/* access routines: lookup, readlink, permission */
Al Viro00cd8dd2012-06-10 17:13:09 -040096static struct dentry *coda_lookup(struct inode *dir, struct dentry *entry, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -070097{
Al Virof4947fb2012-01-10 11:11:49 -050098 struct super_block *sb = dir->i_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -070099 const char *name = entry->d_name.name;
100 size_t length = entry->d_name.len;
Al Virof4947fb2012-01-10 11:11:49 -0500101 struct inode *inode;
102 int type = 0;
Jan Harkesed36f722007-07-19 01:48:49 -0700103
104 if (length > CODA_MAXNAMLEN) {
105 printk(KERN_ERR "name too long: lookup, %s (%*s)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700106 coda_i2s(dir), (int)length, name);
107 return ERR_PTR(-ENAMETOOLONG);
108 }
109
Jan Harkesed36f722007-07-19 01:48:49 -0700110 /* control object, create inode on the fly */
111 if (coda_isroot(dir) && coda_iscontrol(name, length)) {
Al Virof4947fb2012-01-10 11:11:49 -0500112 inode = coda_cnode_makectl(sb);
Jan Harkesed36f722007-07-19 01:48:49 -0700113 type = CODA_NOCACHE;
Al Virof4947fb2012-01-10 11:11:49 -0500114 } else {
115 struct CodaFid fid = { { 0, } };
116 int error = venus_lookup(sb, coda_i2f(dir), name, length,
117 &type, &fid);
118 inode = !error ? coda_cnode_make(&fid, sb) : ERR_PTR(error);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700119 }
120
Al Virof4947fb2012-01-10 11:11:49 -0500121 if (!IS_ERR(inode) && (type & CODA_NOCACHE))
Jan Harkesed36f722007-07-19 01:48:49 -0700122 coda_flag_inode(inode, C_VATTR | C_PURGE);
123
Al Virof4947fb2012-01-10 11:11:49 -0500124 if (inode == ERR_PTR(-ENOENT))
125 inode = NULL;
126
Jan Harkesed36f722007-07-19 01:48:49 -0700127 return d_splice_alias(inode, entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128}
129
130
Al Viro10556cb2011-06-20 19:28:19 -0400131int coda_permission(struct inode *inode, int mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132{
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400133 int error;
Al Viroe6305c42008-07-15 21:03:57 -0400134
Al Viro10556cb2011-06-20 19:28:19 -0400135 if (mask & MAY_NOT_BLOCK)
Nick Pigginb74c79e2011-01-07 17:49:58 +1100136 return -ECHILD;
137
Al Viroe6305c42008-07-15 21:03:57 -0400138 mask &= MAY_READ | MAY_WRITE | MAY_EXEC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139
140 if (!mask)
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400141 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700142
Miklos Szeredif696a362008-07-31 13:41:58 +0200143 if ((mask & MAY_EXEC) && !execute_ok(inode))
144 return -EACCES;
145
Linus Torvalds1da177e2005-04-16 15:20:36 -0700146 if (coda_cache_check(inode, mask))
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400147 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700148
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400149 error = venus_access(inode->i_sb, coda_i2f(inode), mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150
151 if (!error)
152 coda_cache_enter(inode, mask);
153
Jan Harkesd7289002007-07-19 01:48:43 -0700154 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155}
156
157
Jan Harkesd7289002007-07-19 01:48:43 -0700158static inline void coda_dir_update_mtime(struct inode *dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159{
160#ifdef REQUERY_VENUS_FOR_MTIME
161 /* invalidate the directory cnode's attributes so we refetch the
162 * attributes from venus next time the inode is referenced */
163 coda_flag_inode(dir, C_VATTR);
164#else
165 /* optimistically we can also act as if our nose bleeds. The
Jan Harkesd7289002007-07-19 01:48:43 -0700166 * granularity of the mtime is coarse anyways so we might actually be
167 * right most of the time. Note: we only do this for directories. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
169#endif
Jan Harkesd7289002007-07-19 01:48:43 -0700170}
171
172/* we have to wrap inc_nlink/drop_nlink because sometimes userspace uses a
173 * trick to fool GNU find's optimizations. If we can't be sure of the link
174 * (because of volume mount points) we set i_nlink to 1 which forces find
175 * to consider every child as a possible directory. We should also never
176 * see an increment or decrement for deleted directories where i_nlink == 0 */
177static inline void coda_dir_inc_nlink(struct inode *dir)
178{
179 if (dir->i_nlink >= 2)
180 inc_nlink(dir);
181}
182
183static inline void coda_dir_drop_nlink(struct inode *dir)
184{
185 if (dir->i_nlink > 2)
186 drop_nlink(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700187}
188
189/* creation routines: create, mknod, mkdir, link, symlink */
Al Viroebfc3b42012-06-10 18:05:36 -0400190static int coda_create(struct inode *dir, struct dentry *de, umode_t mode, bool excl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700191{
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400192 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 const char *name=de->d_name.name;
194 int length=de->d_name.len;
195 struct inode *inode;
196 struct CodaFid newfid;
197 struct coda_vattr attrs;
198
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400199 if (coda_isroot(dir) && coda_iscontrol(name, length))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700201
202 error = venus_create(dir->i_sb, coda_i2f(dir), name, length,
203 0, mode, &newfid, &attrs);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400204 if (error)
205 goto err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206
207 inode = coda_iget(dir->i_sb, &newfid, &attrs);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400208 if (IS_ERR(inode)) {
209 error = PTR_ERR(inode);
210 goto err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211 }
212
213 /* invalidate the directory cnode's attributes */
Jan Harkesd7289002007-07-19 01:48:43 -0700214 coda_dir_update_mtime(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 d_instantiate(de, inode);
Jan Harkesd7289002007-07-19 01:48:43 -0700216 return 0;
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400217err_out:
218 d_drop(de);
219 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700220}
221
Al Viro18bb1db2011-07-26 01:41:39 -0400222static int coda_mkdir(struct inode *dir, struct dentry *de, umode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700223{
224 struct inode *inode;
225 struct coda_vattr attrs;
226 const char *name = de->d_name.name;
227 int len = de->d_name.len;
228 int error;
229 struct CodaFid newfid;
230
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400231 if (coda_isroot(dir) && coda_iscontrol(name, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700233
234 attrs.va_mode = mode;
235 error = venus_mkdir(dir->i_sb, coda_i2f(dir),
236 name, len, &newfid, &attrs);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400237 if (error)
238 goto err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700239
240 inode = coda_iget(dir->i_sb, &newfid, &attrs);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400241 if (IS_ERR(inode)) {
242 error = PTR_ERR(inode);
243 goto err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700244 }
Jan Harkesd7289002007-07-19 01:48:43 -0700245
Linus Torvalds1da177e2005-04-16 15:20:36 -0700246 /* invalidate the directory cnode's attributes */
Jan Harkesd7289002007-07-19 01:48:43 -0700247 coda_dir_inc_nlink(dir);
248 coda_dir_update_mtime(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700249 d_instantiate(de, inode);
Jan Harkesd7289002007-07-19 01:48:43 -0700250 return 0;
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400251err_out:
252 d_drop(de);
253 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700254}
255
256/* try to make de an entry in dir_inodde linked to source_de */
257static int coda_link(struct dentry *source_de, struct inode *dir_inode,
258 struct dentry *de)
259{
260 struct inode *inode = source_de->d_inode;
261 const char * name = de->d_name.name;
262 int len = de->d_name.len;
263 int error;
264
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400265 if (coda_isroot(dir_inode) && coda_iscontrol(name, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267
268 error = venus_link(dir_inode->i_sb, coda_i2f(inode),
269 coda_i2f(dir_inode), (const char *)name, len);
Jan Harkesd7289002007-07-19 01:48:43 -0700270 if (error) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271 d_drop(de);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400272 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700273 }
274
Jan Harkesd7289002007-07-19 01:48:43 -0700275 coda_dir_update_mtime(dir_inode);
Al Viro7de9c6ee2010-10-23 11:11:40 -0400276 ihold(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700277 d_instantiate(de, inode);
Dave Hansend8c76e62006-09-30 23:29:04 -0700278 inc_nlink(inode);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400279 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700280}
281
282
283static int coda_symlink(struct inode *dir_inode, struct dentry *de,
284 const char *symname)
285{
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400286 const char *name = de->d_name.name;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287 int len = de->d_name.len;
288 int symlen;
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400289 int error;
Jan Harkes3cf01f22007-07-19 01:48:51 -0700290
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400291 if (coda_isroot(dir_inode) && coda_iscontrol(name, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700293
294 symlen = strlen(symname);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400295 if (symlen > CODA_MAXPATHLEN)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296 return -ENAMETOOLONG;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700297
298 /*
299 * This entry is now negative. Since we do not create
Jan Harkesd7289002007-07-19 01:48:43 -0700300 * an inode for the entry we have to drop it.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700301 */
302 d_drop(de);
Jan Harkesd7289002007-07-19 01:48:43 -0700303 error = venus_symlink(dir_inode->i_sb, coda_i2f(dir_inode), name, len,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700304 symname, symlen);
305
306 /* mtime is no good anymore */
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400307 if (!error)
Jan Harkesd7289002007-07-19 01:48:43 -0700308 coda_dir_update_mtime(dir_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700309
Jan Harkesd7289002007-07-19 01:48:43 -0700310 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700311}
312
313/* destruction routines: unlink, rmdir */
Harvey Harrison9fe76c72008-04-29 00:58:44 -0700314static int coda_unlink(struct inode *dir, struct dentry *de)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700315{
316 int error;
317 const char *name = de->d_name.name;
318 int len = de->d_name.len;
319
Jan Harkesd7289002007-07-19 01:48:43 -0700320 error = venus_remove(dir->i_sb, coda_i2f(dir), name, len);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400321 if (error)
Jan Harkesd7289002007-07-19 01:48:43 -0700322 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323
Jan Harkesd7289002007-07-19 01:48:43 -0700324 coda_dir_update_mtime(dir);
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700325 drop_nlink(de->d_inode);
Jan Harkesd7289002007-07-19 01:48:43 -0700326 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700327}
328
Harvey Harrison9fe76c72008-04-29 00:58:44 -0700329static int coda_rmdir(struct inode *dir, struct dentry *de)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700330{
331 const char *name = de->d_name.name;
332 int len = de->d_name.len;
Jan Harkes8c6d2152007-07-19 01:48:43 -0700333 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334
Linus Torvalds1da177e2005-04-16 15:20:36 -0700335 error = venus_rmdir(dir->i_sb, coda_i2f(dir), name, len);
Jan Harkes8c6d2152007-07-19 01:48:43 -0700336 if (!error) {
337 /* VFS may delete the child */
338 if (de->d_inode)
Miklos Szeredi6d6b77f2011-10-28 14:13:28 +0200339 clear_nlink(de->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340
Jan Harkes8c6d2152007-07-19 01:48:43 -0700341 /* fix the link count of the parent */
342 coda_dir_drop_nlink(dir);
343 coda_dir_update_mtime(dir);
Jan Harkesd7289002007-07-19 01:48:43 -0700344 }
Jan Harkes8c6d2152007-07-19 01:48:43 -0700345 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700346}
347
348/* rename */
Jan Harkesd7289002007-07-19 01:48:43 -0700349static int coda_rename(struct inode *old_dir, struct dentry *old_dentry,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700350 struct inode *new_dir, struct dentry *new_dentry)
351{
Jan Harkesd7289002007-07-19 01:48:43 -0700352 const char *old_name = old_dentry->d_name.name;
353 const char *new_name = new_dentry->d_name.name;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700354 int old_length = old_dentry->d_name.len;
355 int new_length = new_dentry->d_name.len;
Jan Harkesd7289002007-07-19 01:48:43 -0700356 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357
Jan Harkesd7289002007-07-19 01:48:43 -0700358 error = venus_rename(old_dir->i_sb, coda_i2f(old_dir),
359 coda_i2f(new_dir), old_length, new_length,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700360 (const char *) old_name, (const char *)new_name);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400361 if (!error) {
362 if (new_dentry->d_inode) {
363 if (S_ISDIR(new_dentry->d_inode->i_mode)) {
Jan Harkesd7289002007-07-19 01:48:43 -0700364 coda_dir_drop_nlink(old_dir);
365 coda_dir_inc_nlink(new_dir);
366 }
367 coda_dir_update_mtime(old_dir);
368 coda_dir_update_mtime(new_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700369 coda_flag_inode(new_dentry->d_inode, C_VATTR);
370 } else {
371 coda_flag_inode(old_dir, C_VATTR);
372 coda_flag_inode(new_dir, C_VATTR);
Jan Harkesd7289002007-07-19 01:48:43 -0700373 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700375 return error;
376}
377
378
379/* file operations for directories */
Al Viroe924f252013-05-22 21:15:30 -0400380static int coda_readdir(struct file *coda_file, struct dir_context *ctx)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 struct coda_file_info *cfi;
383 struct file *host_file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700384 int ret;
385
386 cfi = CODA_FTOC(coda_file);
387 BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
388 host_file = cfi->cfi_container;
389
Al Viroe924f252013-05-22 21:15:30 -0400390 if (host_file->f_op->iterate) {
Al Viro496ad9a2013-01-23 17:07:38 -0500391 struct inode *host_inode = file_inode(host_file);
Al Virobb6f6192013-05-15 18:49:12 -0400392 mutex_lock(&host_inode->i_mutex);
393 ret = -ENOENT;
394 if (!IS_DEADDIR(host_inode)) {
395 ret = host_file->f_op->iterate(host_file, ctx);
396 file_accessed(host_file);
397 }
398 mutex_unlock(&host_inode->i_mutex);
Al Viroe924f252013-05-22 21:15:30 -0400399 return ret;
400 }
401 /* Venus: we must read Venus dirents from a file */
402 return coda_venus_readdir(coda_file, ctx);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700403}
404
405static inline unsigned int CDT2DT(unsigned char cdt)
406{
407 unsigned int dt;
408
409 switch(cdt) {
410 case CDT_UNKNOWN: dt = DT_UNKNOWN; break;
411 case CDT_FIFO: dt = DT_FIFO; break;
412 case CDT_CHR: dt = DT_CHR; break;
413 case CDT_DIR: dt = DT_DIR; break;
414 case CDT_BLK: dt = DT_BLK; break;
415 case CDT_REG: dt = DT_REG; break;
416 case CDT_LNK: dt = DT_LNK; break;
417 case CDT_SOCK: dt = DT_SOCK; break;
418 case CDT_WHT: dt = DT_WHT; break;
419 default: dt = DT_UNKNOWN; break;
420 }
421 return dt;
422}
423
424/* support routines */
Al Viroe924f252013-05-22 21:15:30 -0400425static int coda_venus_readdir(struct file *coda_file, struct dir_context *ctx)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700426{
Jan Harkes97875252007-07-19 01:48:47 -0700427 struct coda_file_info *cfi;
428 struct coda_inode_info *cii;
429 struct file *host_file;
430 struct dentry *de;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700431 struct venus_dirent *vdir;
Al Viroee604982011-07-16 17:06:30 -0400432 unsigned long vdir_size = offsetof(struct venus_dirent, d_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700433 unsigned int type;
434 struct qstr name;
435 ino_t ino;
Jan Harkes97875252007-07-19 01:48:47 -0700436 int ret;
437
438 cfi = CODA_FTOC(coda_file);
439 BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
440 host_file = cfi->cfi_container;
441
442 de = coda_file->f_path.dentry;
443 cii = ITOC(de->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700444
Panagiotis Issarisf52720c2006-09-27 01:49:39 -0700445 vdir = kmalloc(sizeof(*vdir), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700446 if (!vdir) return -ENOMEM;
447
Al Viroe924f252013-05-22 21:15:30 -0400448 if (!dir_emit_dots(coda_file, ctx))
449 goto out;
450
Linus Torvalds1da177e2005-04-16 15:20:36 -0700451 while (1) {
452 /* read entries from the directory file */
Al Viroe924f252013-05-22 21:15:30 -0400453 ret = kernel_read(host_file, ctx->pos - 2, (char *)vdir,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700454 sizeof(*vdir));
455 if (ret < 0) {
Jan Harkes97875252007-07-19 01:48:47 -0700456 printk(KERN_ERR "coda readdir: read dir %s failed %d\n",
457 coda_f2s(&cii->c_fid), ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700458 break;
459 }
460 if (ret == 0) break; /* end of directory file reached */
461
462 /* catch truncated reads */
463 if (ret < vdir_size || ret < vdir_size + vdir->d_namlen) {
Jan Harkes97875252007-07-19 01:48:47 -0700464 printk(KERN_ERR "coda readdir: short read on %s\n",
465 coda_f2s(&cii->c_fid));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700466 ret = -EBADF;
467 break;
468 }
469 /* validate whether the directory file actually makes sense */
470 if (vdir->d_reclen < vdir_size + vdir->d_namlen) {
Jan Harkes97875252007-07-19 01:48:47 -0700471 printk(KERN_ERR "coda readdir: invalid dir %s\n",
472 coda_f2s(&cii->c_fid));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700473 ret = -EBADF;
474 break;
475 }
476
477 name.len = vdir->d_namlen;
478 name.name = vdir->d_name;
479
480 /* Make sure we skip '.' and '..', we already got those */
481 if (name.name[0] == '.' && (name.len == 1 ||
Al Viroe924f252013-05-22 21:15:30 -0400482 (name.name[1] == '.' && name.len == 2)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700483 vdir->d_fileno = name.len = 0;
484
485 /* skip null entries */
486 if (vdir->d_fileno && name.len) {
Al Viro6b5e1222013-06-19 13:21:03 +0400487 ino = vdir->d_fileno;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700488 type = CDT2DT(vdir->d_type);
Al Viroe924f252013-05-22 21:15:30 -0400489 if (!dir_emit(ctx, name.name, name.len, ino, type))
490 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700491 }
492 /* we'll always have progress because d_reclen is unsigned and
493 * we've already established it is non-zero. */
Al Viroe924f252013-05-22 21:15:30 -0400494 ctx->pos += vdir->d_reclen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700495 }
Al Viro5f47c7e2007-07-20 00:23:31 +0100496out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497 kfree(vdir);
Al Viroe924f252013-05-22 21:15:30 -0400498 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700499}
500
501/* called when a cache lookup succeeds */
Al Viro0b728e12012-06-10 16:03:43 -0400502static int coda_dentry_revalidate(struct dentry *de, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700503{
Nick Piggin34286d62011-01-07 17:49:57 +1100504 struct inode *inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 struct coda_inode_info *cii;
506
Al Viro0b728e12012-06-10 16:03:43 -0400507 if (flags & LOOKUP_RCU)
Nick Piggin34286d62011-01-07 17:49:57 +1100508 return -ECHILD;
509
510 inode = de->d_inode;
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400511 if (!inode || coda_isroot(inode))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700512 goto out;
513 if (is_bad_inode(inode))
514 goto bad;
515
516 cii = ITOC(de->d_inode);
517 if (!(cii->c_flags & (C_PURGE | C_FLUSH)))
518 goto out;
519
520 shrink_dcache_parent(de);
521
522 /* propagate for a flush */
523 if (cii->c_flags & C_FLUSH)
524 coda_flag_inode_children(inode, C_FLUSH);
525
Al Viro84d08fa2013-07-05 18:59:33 +0400526 if (d_count(de) > 1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700527 /* pretend it's valid, but don't change the flags */
528 goto out;
529
530 /* clear the flags. */
Yoshihisa Abeb5ce1d82010-10-25 02:03:44 -0400531 spin_lock(&cii->c_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700532 cii->c_flags &= ~(C_VATTR | C_PURGE | C_FLUSH);
Yoshihisa Abeb5ce1d82010-10-25 02:03:44 -0400533 spin_unlock(&cii->c_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534bad:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700535 return 0;
536out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700537 return 1;
538}
539
540/*
541 * This is the callback from dput() when d_count is going to 0.
542 * We use this to unhash dentries with bad inodes.
543 */
Nick Pigginfe15ce42011-01-07 17:49:23 +1100544static int coda_dentry_delete(const struct dentry * dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700545{
546 int flags;
547
548 if (!dentry->d_inode)
549 return 0;
550
551 flags = (ITOC(dentry->d_inode)->c_flags) & C_PURGE;
552 if (is_bad_inode(dentry->d_inode) || flags) {
553 return 1;
554 }
555 return 0;
556}
557
558
559
560/*
561 * This is called when we want to check if the inode has
562 * changed on the server. Coda makes this easy since the
563 * cache manager Venus issues a downcall to the kernel when this
564 * happens
565 */
Al Viro11d100d2013-10-04 18:17:02 -0400566int coda_revalidate_inode(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700567{
568 struct coda_vattr attr;
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400569 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700570 int old_mode;
571 ino_t old_ino;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700572 struct coda_inode_info *cii = ITOC(inode);
573
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400574 if (!cii->c_flags)
575 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700576
577 if (cii->c_flags & (C_VATTR | C_PURGE | C_FLUSH)) {
578 error = venus_getattr(inode->i_sb, &(cii->c_fid), &attr);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400579 if (error)
580 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700581
582 /* this inode may be lost if:
583 - it's ino changed
584 - type changes must be permitted for repair and
585 missing mount points.
586 */
587 old_mode = inode->i_mode;
588 old_ino = inode->i_ino;
589 coda_vattr_to_iattr(inode, &attr);
590
591 if ((old_mode & S_IFMT) != (inode->i_mode & S_IFMT)) {
592 printk("Coda: inode %ld, fid %s changed type!\n",
593 inode->i_ino, coda_f2s(&(cii->c_fid)));
594 }
595
596 /* the following can happen when a local fid is replaced
597 with a global one, here we lose and declare the inode bad */
598 if (inode->i_ino != old_ino)
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400599 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700600
601 coda_flag_inode_children(inode, C_FLUSH);
Yoshihisa Abeb5ce1d82010-10-25 02:03:44 -0400602
603 spin_lock(&cii->c_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700604 cii->c_flags &= ~(C_VATTR | C_PURGE | C_FLUSH);
Yoshihisa Abeb5ce1d82010-10-25 02:03:44 -0400605 spin_unlock(&cii->c_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700608}