blob: 9c3dedc000d181945926c606ba26b17168737f99 [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>
Fabian Frederick834b46c2014-08-08 14:20:33 -070022#include <linux/uaccess.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070023
24#include <linux/coda.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070025#include <linux/coda_psdev.h>
Al Viro31a203d2011-01-12 16:36:09 -050026#include "coda_linux.h"
27#include "coda_cache.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070028
Adrian Bunkc98d8cf2006-03-24 03:15:53 -080029#include "coda_int.h"
30
Linus Torvalds1da177e2005-04-16 15:20:36 -070031/* dir inode-ops */
Al Viroebfc3b42012-06-10 18:05:36 -040032static int coda_create(struct inode *dir, struct dentry *new, umode_t mode, bool excl);
Al Viro00cd8dd2012-06-10 17:13:09 -040033static struct dentry *coda_lookup(struct inode *dir, struct dentry *target, unsigned int flags);
Linus Torvalds1da177e2005-04-16 15:20:36 -070034static int coda_link(struct dentry *old_dentry, struct inode *dir_inode,
35 struct dentry *entry);
36static int coda_unlink(struct inode *dir_inode, struct dentry *entry);
37static int coda_symlink(struct inode *dir_inode, struct dentry *entry,
38 const char *symname);
Al Viro18bb1db2011-07-26 01:41:39 -040039static int coda_mkdir(struct inode *dir_inode, struct dentry *entry, umode_t mode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070040static int coda_rmdir(struct inode *dir_inode, struct dentry *entry);
41static int coda_rename(struct inode *old_inode, struct dentry *old_dentry,
42 struct inode *new_inode, struct dentry *new_dentry);
43
44/* dir file-ops */
Al Viroe924f252013-05-22 21:15:30 -040045static int coda_readdir(struct file *file, struct dir_context *ctx);
Linus Torvalds1da177e2005-04-16 15:20:36 -070046
47/* dentry ops */
Al Viro0b728e12012-06-10 16:03:43 -040048static int coda_dentry_revalidate(struct dentry *de, unsigned int flags);
Nick Pigginfe15ce42011-01-07 17:49:23 +110049static int coda_dentry_delete(const struct dentry *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070050
51/* support routines */
Al Viroe924f252013-05-22 21:15:30 -040052static int coda_venus_readdir(struct file *, struct dir_context *);
Linus Torvalds1da177e2005-04-16 15:20:36 -070053
54/* same as fs/bad_inode.c */
55static int coda_return_EIO(void)
56{
57 return -EIO;
58}
59#define CODA_EIO_ERROR ((void *) (coda_return_EIO))
60
Al Viro9501e4c2011-01-12 16:25:02 -050061const struct dentry_operations coda_dentry_operations =
Linus Torvalds1da177e2005-04-16 15:20:36 -070062{
63 .d_revalidate = coda_dentry_revalidate,
64 .d_delete = coda_dentry_delete,
65};
66
Arjan van de Ven754661f2007-02-12 00:55:38 -080067const struct inode_operations coda_dir_inode_operations =
Linus Torvalds1da177e2005-04-16 15:20:36 -070068{
69 .create = coda_create,
70 .lookup = coda_lookup,
71 .link = coda_link,
72 .unlink = coda_unlink,
73 .symlink = coda_symlink,
74 .mkdir = coda_mkdir,
75 .rmdir = coda_rmdir,
76 .mknod = CODA_EIO_ERROR,
77 .rename = coda_rename,
78 .permission = coda_permission,
79 .getattr = coda_getattr,
80 .setattr = coda_setattr,
81};
82
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -080083const struct file_operations coda_dir_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070084 .llseek = generic_file_llseek,
85 .read = generic_read_dir,
Al Viroe924f252013-05-22 21:15:30 -040086 .iterate = coda_readdir,
Linus Torvalds1da177e2005-04-16 15:20:36 -070087 .open = coda_open,
Linus Torvalds1da177e2005-04-16 15:20:36 -070088 .release = coda_release,
89 .fsync = coda_fsync,
90};
91
92
93/* inode operations for directories */
94/* access routines: lookup, readlink, permission */
Al Viro00cd8dd2012-06-10 17:13:09 -040095static struct dentry *coda_lookup(struct inode *dir, struct dentry *entry, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -070096{
Al Virof4947fb2012-01-10 11:11:49 -050097 struct super_block *sb = dir->i_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -070098 const char *name = entry->d_name.name;
99 size_t length = entry->d_name.len;
Al Virof4947fb2012-01-10 11:11:49 -0500100 struct inode *inode;
101 int type = 0;
Jan Harkesed36f722007-07-19 01:48:49 -0700102
103 if (length > CODA_MAXNAMLEN) {
Fabian Frederickd9b4b312014-06-06 14:36:18 -0700104 pr_err("name too long: lookup, %s (%*s)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 coda_i2s(dir), (int)length, name);
106 return ERR_PTR(-ENAMETOOLONG);
107 }
108
Jan Harkesed36f722007-07-19 01:48:49 -0700109 /* control object, create inode on the fly */
110 if (coda_isroot(dir) && coda_iscontrol(name, length)) {
Al Virof4947fb2012-01-10 11:11:49 -0500111 inode = coda_cnode_makectl(sb);
Jan Harkesed36f722007-07-19 01:48:49 -0700112 type = CODA_NOCACHE;
Al Virof4947fb2012-01-10 11:11:49 -0500113 } else {
114 struct CodaFid fid = { { 0, } };
115 int error = venus_lookup(sb, coda_i2f(dir), name, length,
116 &type, &fid);
117 inode = !error ? coda_cnode_make(&fid, sb) : ERR_PTR(error);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 }
119
Al Virof4947fb2012-01-10 11:11:49 -0500120 if (!IS_ERR(inode) && (type & CODA_NOCACHE))
Jan Harkesed36f722007-07-19 01:48:49 -0700121 coda_flag_inode(inode, C_VATTR | C_PURGE);
122
Al Virof4947fb2012-01-10 11:11:49 -0500123 if (inode == ERR_PTR(-ENOENT))
124 inode = NULL;
125
Jan Harkesed36f722007-07-19 01:48:49 -0700126 return d_splice_alias(inode, entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700127}
128
129
Al Viro10556cb2011-06-20 19:28:19 -0400130int coda_permission(struct inode *inode, int mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131{
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400132 int error;
Al Viroe6305c42008-07-15 21:03:57 -0400133
Al Viro10556cb2011-06-20 19:28:19 -0400134 if (mask & MAY_NOT_BLOCK)
Nick Pigginb74c79e2011-01-07 17:49:58 +1100135 return -ECHILD;
136
Al Viroe6305c42008-07-15 21:03:57 -0400137 mask &= MAY_READ | MAY_WRITE | MAY_EXEC;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700138
139 if (!mask)
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400140 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700141
Miklos Szeredif696a362008-07-31 13:41:58 +0200142 if ((mask & MAY_EXEC) && !execute_ok(inode))
143 return -EACCES;
144
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145 if (coda_cache_check(inode, mask))
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400146 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700147
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400148 error = venus_access(inode->i_sb, coda_i2f(inode), mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149
150 if (!error)
151 coda_cache_enter(inode, mask);
152
Jan Harkesd7289002007-07-19 01:48:43 -0700153 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154}
155
156
Jan Harkesd7289002007-07-19 01:48:43 -0700157static inline void coda_dir_update_mtime(struct inode *dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158{
159#ifdef REQUERY_VENUS_FOR_MTIME
160 /* invalidate the directory cnode's attributes so we refetch the
161 * attributes from venus next time the inode is referenced */
162 coda_flag_inode(dir, C_VATTR);
163#else
164 /* optimistically we can also act as if our nose bleeds. The
Jan Harkesd7289002007-07-19 01:48:43 -0700165 * granularity of the mtime is coarse anyways so we might actually be
166 * right most of the time. Note: we only do this for directories. */
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167 dir->i_mtime = dir->i_ctime = CURRENT_TIME_SEC;
168#endif
Jan Harkesd7289002007-07-19 01:48:43 -0700169}
170
171/* we have to wrap inc_nlink/drop_nlink because sometimes userspace uses a
172 * trick to fool GNU find's optimizations. If we can't be sure of the link
173 * (because of volume mount points) we set i_nlink to 1 which forces find
174 * to consider every child as a possible directory. We should also never
175 * see an increment or decrement for deleted directories where i_nlink == 0 */
176static inline void coda_dir_inc_nlink(struct inode *dir)
177{
178 if (dir->i_nlink >= 2)
179 inc_nlink(dir);
180}
181
182static inline void coda_dir_drop_nlink(struct inode *dir)
183{
184 if (dir->i_nlink > 2)
185 drop_nlink(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700186}
187
188/* creation routines: create, mknod, mkdir, link, symlink */
Al Viroebfc3b42012-06-10 18:05:36 -0400189static int coda_create(struct inode *dir, struct dentry *de, umode_t mode, bool excl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190{
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400191 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700192 const char *name=de->d_name.name;
193 int length=de->d_name.len;
194 struct inode *inode;
195 struct CodaFid newfid;
196 struct coda_vattr attrs;
197
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400198 if (coda_isroot(dir) && coda_iscontrol(name, length))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700199 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200
201 error = venus_create(dir->i_sb, coda_i2f(dir), name, length,
202 0, mode, &newfid, &attrs);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400203 if (error)
204 goto err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205
206 inode = coda_iget(dir->i_sb, &newfid, &attrs);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400207 if (IS_ERR(inode)) {
208 error = PTR_ERR(inode);
209 goto err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 }
211
212 /* invalidate the directory cnode's attributes */
Jan Harkesd7289002007-07-19 01:48:43 -0700213 coda_dir_update_mtime(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700214 d_instantiate(de, inode);
Jan Harkesd7289002007-07-19 01:48:43 -0700215 return 0;
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400216err_out:
217 d_drop(de);
218 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219}
220
Al Viro18bb1db2011-07-26 01:41:39 -0400221static int coda_mkdir(struct inode *dir, struct dentry *de, umode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700222{
223 struct inode *inode;
224 struct coda_vattr attrs;
225 const char *name = de->d_name.name;
226 int len = de->d_name.len;
227 int error;
228 struct CodaFid newfid;
229
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400230 if (coda_isroot(dir) && coda_iscontrol(name, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700232
233 attrs.va_mode = mode;
234 error = venus_mkdir(dir->i_sb, coda_i2f(dir),
235 name, len, &newfid, &attrs);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400236 if (error)
237 goto err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700238
239 inode = coda_iget(dir->i_sb, &newfid, &attrs);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400240 if (IS_ERR(inode)) {
241 error = PTR_ERR(inode);
242 goto err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700243 }
Jan Harkesd7289002007-07-19 01:48:43 -0700244
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 /* invalidate the directory cnode's attributes */
Jan Harkesd7289002007-07-19 01:48:43 -0700246 coda_dir_inc_nlink(dir);
247 coda_dir_update_mtime(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 d_instantiate(de, inode);
Jan Harkesd7289002007-07-19 01:48:43 -0700249 return 0;
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400250err_out:
251 d_drop(de);
252 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253}
254
255/* try to make de an entry in dir_inodde linked to source_de */
256static int coda_link(struct dentry *source_de, struct inode *dir_inode,
257 struct dentry *de)
258{
259 struct inode *inode = source_de->d_inode;
260 const char * name = de->d_name.name;
261 int len = de->d_name.len;
262 int error;
263
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400264 if (coda_isroot(dir_inode) && coda_iscontrol(name, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700265 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700266
267 error = venus_link(dir_inode->i_sb, coda_i2f(inode),
268 coda_i2f(dir_inode), (const char *)name, len);
Jan Harkesd7289002007-07-19 01:48:43 -0700269 if (error) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700270 d_drop(de);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400271 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700272 }
273
Jan Harkesd7289002007-07-19 01:48:43 -0700274 coda_dir_update_mtime(dir_inode);
Al Viro7de9c6ee2010-10-23 11:11:40 -0400275 ihold(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700276 d_instantiate(de, inode);
Dave Hansend8c76e62006-09-30 23:29:04 -0700277 inc_nlink(inode);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400278 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279}
280
281
282static int coda_symlink(struct inode *dir_inode, struct dentry *de,
283 const char *symname)
284{
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400285 const char *name = de->d_name.name;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700286 int len = de->d_name.len;
287 int symlen;
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400288 int error;
Jan Harkes3cf01f22007-07-19 01:48:51 -0700289
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400290 if (coda_isroot(dir_inode) && coda_iscontrol(name, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700291 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700292
293 symlen = strlen(symname);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400294 if (symlen > CODA_MAXPATHLEN)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700295 return -ENAMETOOLONG;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296
297 /*
298 * This entry is now negative. Since we do not create
Jan Harkesd7289002007-07-19 01:48:43 -0700299 * an inode for the entry we have to drop it.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700300 */
301 d_drop(de);
Jan Harkesd7289002007-07-19 01:48:43 -0700302 error = venus_symlink(dir_inode->i_sb, coda_i2f(dir_inode), name, len,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700303 symname, symlen);
304
305 /* mtime is no good anymore */
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400306 if (!error)
Jan Harkesd7289002007-07-19 01:48:43 -0700307 coda_dir_update_mtime(dir_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308
Jan Harkesd7289002007-07-19 01:48:43 -0700309 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700310}
311
312/* destruction routines: unlink, rmdir */
Harvey Harrison9fe76c72008-04-29 00:58:44 -0700313static int coda_unlink(struct inode *dir, struct dentry *de)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700314{
315 int error;
316 const char *name = de->d_name.name;
317 int len = de->d_name.len;
318
Jan Harkesd7289002007-07-19 01:48:43 -0700319 error = venus_remove(dir->i_sb, coda_i2f(dir), name, len);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400320 if (error)
Jan Harkesd7289002007-07-19 01:48:43 -0700321 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322
Jan Harkesd7289002007-07-19 01:48:43 -0700323 coda_dir_update_mtime(dir);
Dave Hansen9a53c3a2006-09-30 23:29:03 -0700324 drop_nlink(de->d_inode);
Jan Harkesd7289002007-07-19 01:48:43 -0700325 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326}
327
Harvey Harrison9fe76c72008-04-29 00:58:44 -0700328static int coda_rmdir(struct inode *dir, struct dentry *de)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700329{
330 const char *name = de->d_name.name;
331 int len = de->d_name.len;
Jan Harkes8c6d2152007-07-19 01:48:43 -0700332 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700333
Linus Torvalds1da177e2005-04-16 15:20:36 -0700334 error = venus_rmdir(dir->i_sb, coda_i2f(dir), name, len);
Jan Harkes8c6d2152007-07-19 01:48:43 -0700335 if (!error) {
336 /* VFS may delete the child */
337 if (de->d_inode)
Miklos Szeredi6d6b77f2011-10-28 14:13:28 +0200338 clear_nlink(de->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700339
Jan Harkes8c6d2152007-07-19 01:48:43 -0700340 /* fix the link count of the parent */
341 coda_dir_drop_nlink(dir);
342 coda_dir_update_mtime(dir);
Jan Harkesd7289002007-07-19 01:48:43 -0700343 }
Jan Harkes8c6d2152007-07-19 01:48:43 -0700344 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700345}
346
347/* rename */
Jan Harkesd7289002007-07-19 01:48:43 -0700348static int coda_rename(struct inode *old_dir, struct dentry *old_dentry,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700349 struct inode *new_dir, struct dentry *new_dentry)
350{
Jan Harkesd7289002007-07-19 01:48:43 -0700351 const char *old_name = old_dentry->d_name.name;
352 const char *new_name = new_dentry->d_name.name;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 int old_length = old_dentry->d_name.len;
354 int new_length = new_dentry->d_name.len;
Jan Harkesd7289002007-07-19 01:48:43 -0700355 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700356
Jan Harkesd7289002007-07-19 01:48:43 -0700357 error = venus_rename(old_dir->i_sb, coda_i2f(old_dir),
358 coda_i2f(new_dir), old_length, new_length,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359 (const char *) old_name, (const char *)new_name);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400360 if (!error) {
361 if (new_dentry->d_inode) {
362 if (S_ISDIR(new_dentry->d_inode->i_mode)) {
Jan Harkesd7289002007-07-19 01:48:43 -0700363 coda_dir_drop_nlink(old_dir);
364 coda_dir_inc_nlink(new_dir);
365 }
366 coda_dir_update_mtime(old_dir);
367 coda_dir_update_mtime(new_dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 coda_flag_inode(new_dentry->d_inode, C_VATTR);
369 } else {
370 coda_flag_inode(old_dir, C_VATTR);
371 coda_flag_inode(new_dir, C_VATTR);
Jan Harkesd7289002007-07-19 01:48:43 -0700372 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700374 return error;
375}
376
377
378/* file operations for directories */
Al Viroe924f252013-05-22 21:15:30 -0400379static int coda_readdir(struct file *coda_file, struct dir_context *ctx)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700380{
Linus Torvalds1da177e2005-04-16 15:20:36 -0700381 struct coda_file_info *cfi;
382 struct file *host_file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700383 int ret;
384
385 cfi = CODA_FTOC(coda_file);
386 BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
387 host_file = cfi->cfi_container;
388
Al Viroe924f252013-05-22 21:15:30 -0400389 if (host_file->f_op->iterate) {
Al Viro496ad9a2013-01-23 17:07:38 -0500390 struct inode *host_inode = file_inode(host_file);
Al Virobb6f6192013-05-15 18:49:12 -0400391 mutex_lock(&host_inode->i_mutex);
392 ret = -ENOENT;
393 if (!IS_DEADDIR(host_inode)) {
394 ret = host_file->f_op->iterate(host_file, ctx);
395 file_accessed(host_file);
396 }
397 mutex_unlock(&host_inode->i_mutex);
Al Viroe924f252013-05-22 21:15:30 -0400398 return ret;
399 }
400 /* Venus: we must read Venus dirents from a file */
401 return coda_venus_readdir(coda_file, ctx);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402}
403
404static inline unsigned int CDT2DT(unsigned char cdt)
405{
406 unsigned int dt;
407
408 switch(cdt) {
409 case CDT_UNKNOWN: dt = DT_UNKNOWN; break;
410 case CDT_FIFO: dt = DT_FIFO; break;
411 case CDT_CHR: dt = DT_CHR; break;
412 case CDT_DIR: dt = DT_DIR; break;
413 case CDT_BLK: dt = DT_BLK; break;
414 case CDT_REG: dt = DT_REG; break;
415 case CDT_LNK: dt = DT_LNK; break;
416 case CDT_SOCK: dt = DT_SOCK; break;
417 case CDT_WHT: dt = DT_WHT; break;
418 default: dt = DT_UNKNOWN; break;
419 }
420 return dt;
421}
422
423/* support routines */
Al Viroe924f252013-05-22 21:15:30 -0400424static int coda_venus_readdir(struct file *coda_file, struct dir_context *ctx)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700425{
Jan Harkes97875252007-07-19 01:48:47 -0700426 struct coda_file_info *cfi;
427 struct coda_inode_info *cii;
428 struct file *host_file;
429 struct dentry *de;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700430 struct venus_dirent *vdir;
Al Viroee604982011-07-16 17:06:30 -0400431 unsigned long vdir_size = offsetof(struct venus_dirent, d_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700432 unsigned int type;
433 struct qstr name;
434 ino_t ino;
Jan Harkes97875252007-07-19 01:48:47 -0700435 int ret;
436
437 cfi = CODA_FTOC(coda_file);
438 BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
439 host_file = cfi->cfi_container;
440
441 de = coda_file->f_path.dentry;
442 cii = ITOC(de->d_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700443
Panagiotis Issarisf52720c2006-09-27 01:49:39 -0700444 vdir = kmalloc(sizeof(*vdir), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700445 if (!vdir) return -ENOMEM;
446
Al Viroe924f252013-05-22 21:15:30 -0400447 if (!dir_emit_dots(coda_file, ctx))
448 goto out;
449
Linus Torvalds1da177e2005-04-16 15:20:36 -0700450 while (1) {
451 /* read entries from the directory file */
Al Viroe924f252013-05-22 21:15:30 -0400452 ret = kernel_read(host_file, ctx->pos - 2, (char *)vdir,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453 sizeof(*vdir));
454 if (ret < 0) {
Fabian Frederick6d6bd942014-06-06 14:36:20 -0700455 pr_err("%s: read dir %s failed %d\n",
456 __func__, coda_f2s(&cii->c_fid), ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 break;
458 }
459 if (ret == 0) break; /* end of directory file reached */
460
461 /* catch truncated reads */
462 if (ret < vdir_size || ret < vdir_size + vdir->d_namlen) {
Fabian Frederick6d6bd942014-06-06 14:36:20 -0700463 pr_err("%s: short read on %s\n",
464 __func__, coda_f2s(&cii->c_fid));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700465 ret = -EBADF;
466 break;
467 }
468 /* validate whether the directory file actually makes sense */
469 if (vdir->d_reclen < vdir_size + vdir->d_namlen) {
Fabian Frederick6d6bd942014-06-06 14:36:20 -0700470 pr_err("%s: invalid dir %s\n",
471 __func__, coda_f2s(&cii->c_fid));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700472 ret = -EBADF;
473 break;
474 }
475
476 name.len = vdir->d_namlen;
477 name.name = vdir->d_name;
478
479 /* Make sure we skip '.' and '..', we already got those */
480 if (name.name[0] == '.' && (name.len == 1 ||
Al Viroe924f252013-05-22 21:15:30 -0400481 (name.name[1] == '.' && name.len == 2)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700482 vdir->d_fileno = name.len = 0;
483
484 /* skip null entries */
485 if (vdir->d_fileno && name.len) {
Al Viro6b5e1222013-06-19 13:21:03 +0400486 ino = vdir->d_fileno;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 type = CDT2DT(vdir->d_type);
Al Viroe924f252013-05-22 21:15:30 -0400488 if (!dir_emit(ctx, name.name, name.len, ino, type))
489 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700490 }
491 /* we'll always have progress because d_reclen is unsigned and
492 * we've already established it is non-zero. */
Al Viroe924f252013-05-22 21:15:30 -0400493 ctx->pos += vdir->d_reclen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700494 }
Al Viro5f47c7e2007-07-20 00:23:31 +0100495out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700496 kfree(vdir);
Al Viroe924f252013-05-22 21:15:30 -0400497 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700498}
499
500/* called when a cache lookup succeeds */
Al Viro0b728e12012-06-10 16:03:43 -0400501static int coda_dentry_revalidate(struct dentry *de, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700502{
Nick Piggin34286d62011-01-07 17:49:57 +1100503 struct inode *inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700504 struct coda_inode_info *cii;
505
Al Viro0b728e12012-06-10 16:03:43 -0400506 if (flags & LOOKUP_RCU)
Nick Piggin34286d62011-01-07 17:49:57 +1100507 return -ECHILD;
508
509 inode = de->d_inode;
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400510 if (!inode || coda_isroot(inode))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700511 goto out;
512 if (is_bad_inode(inode))
513 goto bad;
514
515 cii = ITOC(de->d_inode);
516 if (!(cii->c_flags & (C_PURGE | C_FLUSH)))
517 goto out;
518
519 shrink_dcache_parent(de);
520
521 /* propagate for a flush */
522 if (cii->c_flags & C_FLUSH)
523 coda_flag_inode_children(inode, C_FLUSH);
524
Al Viro84d08fa2013-07-05 18:59:33 +0400525 if (d_count(de) > 1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700526 /* pretend it's valid, but don't change the flags */
527 goto out;
528
529 /* clear the flags. */
Yoshihisa Abeb5ce1d82010-10-25 02:03:44 -0400530 spin_lock(&cii->c_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700531 cii->c_flags &= ~(C_VATTR | C_PURGE | C_FLUSH);
Yoshihisa Abeb5ce1d82010-10-25 02:03:44 -0400532 spin_unlock(&cii->c_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533bad:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700534 return 0;
535out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700536 return 1;
537}
538
539/*
540 * This is the callback from dput() when d_count is going to 0.
541 * We use this to unhash dentries with bad inodes.
542 */
Nick Pigginfe15ce42011-01-07 17:49:23 +1100543static int coda_dentry_delete(const struct dentry * dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700544{
545 int flags;
546
547 if (!dentry->d_inode)
548 return 0;
549
550 flags = (ITOC(dentry->d_inode)->c_flags) & C_PURGE;
551 if (is_bad_inode(dentry->d_inode) || flags) {
552 return 1;
553 }
554 return 0;
555}
556
557
558
559/*
560 * This is called when we want to check if the inode has
561 * changed on the server. Coda makes this easy since the
562 * cache manager Venus issues a downcall to the kernel when this
563 * happens
564 */
Al Viro11d100d2013-10-04 18:17:02 -0400565int coda_revalidate_inode(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700566{
567 struct coda_vattr attr;
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400568 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700569 int old_mode;
570 ino_t old_ino;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700571 struct coda_inode_info *cii = ITOC(inode);
572
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400573 if (!cii->c_flags)
574 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700575
576 if (cii->c_flags & (C_VATTR | C_PURGE | C_FLUSH)) {
577 error = venus_getattr(inode->i_sb, &(cii->c_fid), &attr);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400578 if (error)
579 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700580
581 /* this inode may be lost if:
582 - it's ino changed
583 - type changes must be permitted for repair and
584 missing mount points.
585 */
586 old_mode = inode->i_mode;
587 old_ino = inode->i_ino;
588 coda_vattr_to_iattr(inode, &attr);
589
590 if ((old_mode & S_IFMT) != (inode->i_mode & S_IFMT)) {
Fabian Frederickf38cfb22014-06-06 14:36:19 -0700591 pr_warn("inode %ld, fid %s changed type!\n",
Fabian Frederickd9b4b312014-06-06 14:36:18 -0700592 inode->i_ino, coda_f2s(&(cii->c_fid)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700593 }
594
595 /* the following can happen when a local fid is replaced
596 with a global one, here we lose and declare the inode bad */
597 if (inode->i_ino != old_ino)
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400598 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700599
600 coda_flag_inode_children(inode, C_FLUSH);
Yoshihisa Abeb5ce1d82010-10-25 02:03:44 -0400601
602 spin_lock(&cii->c_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700603 cii->c_flags &= ~(C_VATTR | C_PURGE | C_FLUSH);
Yoshihisa Abeb5ce1d82010-10-25 02:03:44 -0400604 spin_unlock(&cii->c_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700605 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700606 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700607}