blob: c0474ac6cbf200eb458eaf5e3f2359e9b0edfcab [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/* same as fs/bad_inode.c */
32static int coda_return_EIO(void)
33{
34 return -EIO;
35}
36#define CODA_EIO_ERROR ((void *) (coda_return_EIO))
37
Linus Torvalds1da177e2005-04-16 15:20:36 -070038/* inode operations for directories */
39/* access routines: lookup, readlink, permission */
Al Viro00cd8dd2012-06-10 17:13:09 -040040static struct dentry *coda_lookup(struct inode *dir, struct dentry *entry, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -070041{
Al Virof4947fb2012-01-10 11:11:49 -050042 struct super_block *sb = dir->i_sb;
Linus Torvalds1da177e2005-04-16 15:20:36 -070043 const char *name = entry->d_name.name;
44 size_t length = entry->d_name.len;
Al Virof4947fb2012-01-10 11:11:49 -050045 struct inode *inode;
46 int type = 0;
Jan Harkesed36f722007-07-19 01:48:49 -070047
48 if (length > CODA_MAXNAMLEN) {
Fabian Frederickd9b4b312014-06-06 14:36:18 -070049 pr_err("name too long: lookup, %s (%*s)\n",
Linus Torvalds1da177e2005-04-16 15:20:36 -070050 coda_i2s(dir), (int)length, name);
51 return ERR_PTR(-ENAMETOOLONG);
52 }
53
Jan Harkesed36f722007-07-19 01:48:49 -070054 /* control object, create inode on the fly */
Al Viroa7400222014-10-21 15:20:42 -040055 if (is_root_inode(dir) && coda_iscontrol(name, length)) {
Al Virof4947fb2012-01-10 11:11:49 -050056 inode = coda_cnode_makectl(sb);
Jan Harkesed36f722007-07-19 01:48:49 -070057 type = CODA_NOCACHE;
Al Virof4947fb2012-01-10 11:11:49 -050058 } else {
59 struct CodaFid fid = { { 0, } };
60 int error = venus_lookup(sb, coda_i2f(dir), name, length,
61 &type, &fid);
62 inode = !error ? coda_cnode_make(&fid, sb) : ERR_PTR(error);
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 }
64
Al Virof4947fb2012-01-10 11:11:49 -050065 if (!IS_ERR(inode) && (type & CODA_NOCACHE))
Jan Harkesed36f722007-07-19 01:48:49 -070066 coda_flag_inode(inode, C_VATTR | C_PURGE);
67
Al Virof4947fb2012-01-10 11:11:49 -050068 if (inode == ERR_PTR(-ENOENT))
69 inode = NULL;
70
Jan Harkesed36f722007-07-19 01:48:49 -070071 return d_splice_alias(inode, entry);
Linus Torvalds1da177e2005-04-16 15:20:36 -070072}
73
74
Al Viro10556cb2011-06-20 19:28:19 -040075int coda_permission(struct inode *inode, int mask)
Linus Torvalds1da177e2005-04-16 15:20:36 -070076{
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -040077 int error;
Al Viroe6305c42008-07-15 21:03:57 -040078
Al Viro10556cb2011-06-20 19:28:19 -040079 if (mask & MAY_NOT_BLOCK)
Nick Pigginb74c79e2011-01-07 17:49:58 +110080 return -ECHILD;
81
Al Viroe6305c42008-07-15 21:03:57 -040082 mask &= MAY_READ | MAY_WRITE | MAY_EXEC;
Linus Torvalds1da177e2005-04-16 15:20:36 -070083
84 if (!mask)
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -040085 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070086
Miklos Szeredif696a362008-07-31 13:41:58 +020087 if ((mask & MAY_EXEC) && !execute_ok(inode))
88 return -EACCES;
89
Linus Torvalds1da177e2005-04-16 15:20:36 -070090 if (coda_cache_check(inode, mask))
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -040091 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070092
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -040093 error = venus_access(inode->i_sb, coda_i2f(inode), mask);
Linus Torvalds1da177e2005-04-16 15:20:36 -070094
95 if (!error)
96 coda_cache_enter(inode, mask);
97
Jan Harkesd7289002007-07-19 01:48:43 -070098 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -070099}
100
101
Jan Harkesd7289002007-07-19 01:48:43 -0700102static inline void coda_dir_update_mtime(struct inode *dir)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103{
104#ifdef REQUERY_VENUS_FOR_MTIME
105 /* invalidate the directory cnode's attributes so we refetch the
106 * attributes from venus next time the inode is referenced */
107 coda_flag_inode(dir, C_VATTR);
108#else
109 /* optimistically we can also act as if our nose bleeds. The
Jan Harkesd7289002007-07-19 01:48:43 -0700110 * granularity of the mtime is coarse anyways so we might actually be
111 * right most of the time. Note: we only do this for directories. */
Deepa Dinamani02027d42016-09-14 07:48:05 -0700112 dir->i_mtime = dir->i_ctime = current_time(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700113#endif
Jan Harkesd7289002007-07-19 01:48:43 -0700114}
115
116/* we have to wrap inc_nlink/drop_nlink because sometimes userspace uses a
117 * trick to fool GNU find's optimizations. If we can't be sure of the link
118 * (because of volume mount points) we set i_nlink to 1 which forces find
119 * to consider every child as a possible directory. We should also never
120 * see an increment or decrement for deleted directories where i_nlink == 0 */
121static inline void coda_dir_inc_nlink(struct inode *dir)
122{
123 if (dir->i_nlink >= 2)
124 inc_nlink(dir);
125}
126
127static inline void coda_dir_drop_nlink(struct inode *dir)
128{
129 if (dir->i_nlink > 2)
130 drop_nlink(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700131}
132
133/* creation routines: create, mknod, mkdir, link, symlink */
Al Viroebfc3b42012-06-10 18:05:36 -0400134static int coda_create(struct inode *dir, struct dentry *de, umode_t mode, bool excl)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700135{
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400136 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700137 const char *name=de->d_name.name;
138 int length=de->d_name.len;
139 struct inode *inode;
140 struct CodaFid newfid;
141 struct coda_vattr attrs;
142
Al Viroa7400222014-10-21 15:20:42 -0400143 if (is_root_inode(dir) && coda_iscontrol(name, length))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700145
146 error = venus_create(dir->i_sb, coda_i2f(dir), name, length,
147 0, mode, &newfid, &attrs);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400148 if (error)
149 goto err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700150
151 inode = coda_iget(dir->i_sb, &newfid, &attrs);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400152 if (IS_ERR(inode)) {
153 error = PTR_ERR(inode);
154 goto err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700155 }
156
157 /* invalidate the directory cnode's attributes */
Jan Harkesd7289002007-07-19 01:48:43 -0700158 coda_dir_update_mtime(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700159 d_instantiate(de, inode);
Jan Harkesd7289002007-07-19 01:48:43 -0700160 return 0;
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400161err_out:
162 d_drop(de);
163 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700164}
165
Al Viro18bb1db2011-07-26 01:41:39 -0400166static int coda_mkdir(struct inode *dir, struct dentry *de, umode_t mode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700167{
168 struct inode *inode;
169 struct coda_vattr attrs;
170 const char *name = de->d_name.name;
171 int len = de->d_name.len;
172 int error;
173 struct CodaFid newfid;
174
Al Viroa7400222014-10-21 15:20:42 -0400175 if (is_root_inode(dir) && coda_iscontrol(name, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700176 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177
178 attrs.va_mode = mode;
179 error = venus_mkdir(dir->i_sb, coda_i2f(dir),
180 name, len, &newfid, &attrs);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400181 if (error)
182 goto err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700183
184 inode = coda_iget(dir->i_sb, &newfid, &attrs);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400185 if (IS_ERR(inode)) {
186 error = PTR_ERR(inode);
187 goto err_out;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 }
Jan Harkesd7289002007-07-19 01:48:43 -0700189
Linus Torvalds1da177e2005-04-16 15:20:36 -0700190 /* invalidate the directory cnode's attributes */
Jan Harkesd7289002007-07-19 01:48:43 -0700191 coda_dir_inc_nlink(dir);
192 coda_dir_update_mtime(dir);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700193 d_instantiate(de, inode);
Jan Harkesd7289002007-07-19 01:48:43 -0700194 return 0;
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400195err_out:
196 d_drop(de);
197 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198}
199
200/* try to make de an entry in dir_inodde linked to source_de */
201static int coda_link(struct dentry *source_de, struct inode *dir_inode,
202 struct dentry *de)
203{
David Howells2b0143b2015-03-17 22:25:59 +0000204 struct inode *inode = d_inode(source_de);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700205 const char * name = de->d_name.name;
206 int len = de->d_name.len;
207 int error;
208
Al Viroa7400222014-10-21 15:20:42 -0400209 if (is_root_inode(dir_inode) && coda_iscontrol(name, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700210 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211
212 error = venus_link(dir_inode->i_sb, coda_i2f(inode),
213 coda_i2f(dir_inode), (const char *)name, len);
Jan Harkesd7289002007-07-19 01:48:43 -0700214 if (error) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215 d_drop(de);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400216 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700217 }
218
Jan Harkesd7289002007-07-19 01:48:43 -0700219 coda_dir_update_mtime(dir_inode);
Al Viro7de9c6ee2010-10-23 11:11:40 -0400220 ihold(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700221 d_instantiate(de, inode);
Dave Hansend8c76e62006-09-30 23:29:04 -0700222 inc_nlink(inode);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400223 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700224}
225
226
227static int coda_symlink(struct inode *dir_inode, struct dentry *de,
228 const char *symname)
229{
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400230 const char *name = de->d_name.name;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700231 int len = de->d_name.len;
232 int symlen;
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400233 int error;
Jan Harkes3cf01f22007-07-19 01:48:51 -0700234
Al Viroa7400222014-10-21 15:20:42 -0400235 if (is_root_inode(dir_inode) && coda_iscontrol(name, len))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700236 return -EPERM;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700237
238 symlen = strlen(symname);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400239 if (symlen > CODA_MAXPATHLEN)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700240 return -ENAMETOOLONG;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700241
242 /*
243 * This entry is now negative. Since we do not create
Jan Harkesd7289002007-07-19 01:48:43 -0700244 * an inode for the entry we have to drop it.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700245 */
246 d_drop(de);
Jan Harkesd7289002007-07-19 01:48:43 -0700247 error = venus_symlink(dir_inode->i_sb, coda_i2f(dir_inode), name, len,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700248 symname, symlen);
249
250 /* mtime is no good anymore */
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400251 if (!error)
Jan Harkesd7289002007-07-19 01:48:43 -0700252 coda_dir_update_mtime(dir_inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700253
Jan Harkesd7289002007-07-19 01:48:43 -0700254 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255}
256
257/* destruction routines: unlink, rmdir */
Harvey Harrison9fe76c72008-04-29 00:58:44 -0700258static int coda_unlink(struct inode *dir, struct dentry *de)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700259{
260 int error;
261 const char *name = de->d_name.name;
262 int len = de->d_name.len;
263
Jan Harkesd7289002007-07-19 01:48:43 -0700264 error = venus_remove(dir->i_sb, coda_i2f(dir), name, len);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400265 if (error)
Jan Harkesd7289002007-07-19 01:48:43 -0700266 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700267
Jan Harkesd7289002007-07-19 01:48:43 -0700268 coda_dir_update_mtime(dir);
David Howells2b0143b2015-03-17 22:25:59 +0000269 drop_nlink(d_inode(de));
Jan Harkesd7289002007-07-19 01:48:43 -0700270 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700271}
272
Harvey Harrison9fe76c72008-04-29 00:58:44 -0700273static int coda_rmdir(struct inode *dir, struct dentry *de)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700274{
275 const char *name = de->d_name.name;
276 int len = de->d_name.len;
Jan Harkes8c6d2152007-07-19 01:48:43 -0700277 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278
Linus Torvalds1da177e2005-04-16 15:20:36 -0700279 error = venus_rmdir(dir->i_sb, coda_i2f(dir), name, len);
Jan Harkes8c6d2152007-07-19 01:48:43 -0700280 if (!error) {
281 /* VFS may delete the child */
David Howells2b0143b2015-03-17 22:25:59 +0000282 if (d_really_is_positive(de))
283 clear_nlink(d_inode(de));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284
Jan Harkes8c6d2152007-07-19 01:48:43 -0700285 /* fix the link count of the parent */
286 coda_dir_drop_nlink(dir);
287 coda_dir_update_mtime(dir);
Jan Harkesd7289002007-07-19 01:48:43 -0700288 }
Jan Harkes8c6d2152007-07-19 01:48:43 -0700289 return error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700290}
291
292/* rename */
Jan Harkesd7289002007-07-19 01:48:43 -0700293static int coda_rename(struct inode *old_dir, struct dentry *old_dentry,
Miklos Szeredi1cd66c92016-09-27 11:03:58 +0200294 struct inode *new_dir, struct dentry *new_dentry,
295 unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700296{
Jan Harkesd7289002007-07-19 01:48:43 -0700297 const char *old_name = old_dentry->d_name.name;
298 const char *new_name = new_dentry->d_name.name;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700299 int old_length = old_dentry->d_name.len;
300 int new_length = new_dentry->d_name.len;
Jan Harkesd7289002007-07-19 01:48:43 -0700301 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700302
Miklos Szeredi1cd66c92016-09-27 11:03:58 +0200303 if (flags)
304 return -EINVAL;
305
Jan Harkesd7289002007-07-19 01:48:43 -0700306 error = venus_rename(old_dir->i_sb, coda_i2f(old_dir),
307 coda_i2f(new_dir), old_length, new_length,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700308 (const char *) old_name, (const char *)new_name);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400309 if (!error) {
David Howells2b0143b2015-03-17 22:25:59 +0000310 if (d_really_is_positive(new_dentry)) {
David Howellse36cb0b2015-01-29 12:02:35 +0000311 if (d_is_dir(new_dentry)) {
Jan Harkesd7289002007-07-19 01:48:43 -0700312 coda_dir_drop_nlink(old_dir);
313 coda_dir_inc_nlink(new_dir);
314 }
315 coda_dir_update_mtime(old_dir);
316 coda_dir_update_mtime(new_dir);
David Howells2b0143b2015-03-17 22:25:59 +0000317 coda_flag_inode(d_inode(new_dentry), C_VATTR);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318 } else {
319 coda_flag_inode(old_dir, C_VATTR);
320 coda_flag_inode(new_dir, C_VATTR);
Jan Harkesd7289002007-07-19 01:48:43 -0700321 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700322 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700323 return error;
324}
325
Linus Torvalds1da177e2005-04-16 15:20:36 -0700326static inline unsigned int CDT2DT(unsigned char cdt)
327{
328 unsigned int dt;
329
330 switch(cdt) {
331 case CDT_UNKNOWN: dt = DT_UNKNOWN; break;
332 case CDT_FIFO: dt = DT_FIFO; break;
333 case CDT_CHR: dt = DT_CHR; break;
334 case CDT_DIR: dt = DT_DIR; break;
335 case CDT_BLK: dt = DT_BLK; break;
336 case CDT_REG: dt = DT_REG; break;
337 case CDT_LNK: dt = DT_LNK; break;
338 case CDT_SOCK: dt = DT_SOCK; break;
339 case CDT_WHT: dt = DT_WHT; break;
340 default: dt = DT_UNKNOWN; break;
341 }
342 return dt;
343}
344
345/* support routines */
Al Viroe924f252013-05-22 21:15:30 -0400346static int coda_venus_readdir(struct file *coda_file, struct dir_context *ctx)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700347{
Jan Harkes97875252007-07-19 01:48:47 -0700348 struct coda_file_info *cfi;
349 struct coda_inode_info *cii;
350 struct file *host_file;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 struct venus_dirent *vdir;
Al Viroee604982011-07-16 17:06:30 -0400352 unsigned long vdir_size = offsetof(struct venus_dirent, d_name);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700353 unsigned int type;
354 struct qstr name;
355 ino_t ino;
Jan Harkes97875252007-07-19 01:48:47 -0700356 int ret;
357
358 cfi = CODA_FTOC(coda_file);
359 BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
360 host_file = cfi->cfi_container;
361
Al Viro93fe74b2014-12-11 13:19:03 -0500362 cii = ITOC(file_inode(coda_file));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700363
Panagiotis Issarisf52720c2006-09-27 01:49:39 -0700364 vdir = kmalloc(sizeof(*vdir), GFP_KERNEL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700365 if (!vdir) return -ENOMEM;
366
Al Viroe924f252013-05-22 21:15:30 -0400367 if (!dir_emit_dots(coda_file, ctx))
368 goto out;
369
Linus Torvalds1da177e2005-04-16 15:20:36 -0700370 while (1) {
371 /* read entries from the directory file */
Al Viroe924f252013-05-22 21:15:30 -0400372 ret = kernel_read(host_file, ctx->pos - 2, (char *)vdir,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700373 sizeof(*vdir));
374 if (ret < 0) {
Fabian Frederick6d6bd942014-06-06 14:36:20 -0700375 pr_err("%s: read dir %s failed %d\n",
376 __func__, coda_f2s(&cii->c_fid), ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700377 break;
378 }
379 if (ret == 0) break; /* end of directory file reached */
380
381 /* catch truncated reads */
382 if (ret < vdir_size || ret < vdir_size + vdir->d_namlen) {
Fabian Frederick6d6bd942014-06-06 14:36:20 -0700383 pr_err("%s: short read on %s\n",
384 __func__, coda_f2s(&cii->c_fid));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700385 ret = -EBADF;
386 break;
387 }
388 /* validate whether the directory file actually makes sense */
389 if (vdir->d_reclen < vdir_size + vdir->d_namlen) {
Fabian Frederick6d6bd942014-06-06 14:36:20 -0700390 pr_err("%s: invalid dir %s\n",
391 __func__, coda_f2s(&cii->c_fid));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700392 ret = -EBADF;
393 break;
394 }
395
396 name.len = vdir->d_namlen;
397 name.name = vdir->d_name;
398
399 /* Make sure we skip '.' and '..', we already got those */
400 if (name.name[0] == '.' && (name.len == 1 ||
Al Viroe924f252013-05-22 21:15:30 -0400401 (name.name[1] == '.' && name.len == 2)))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 vdir->d_fileno = name.len = 0;
403
404 /* skip null entries */
405 if (vdir->d_fileno && name.len) {
Al Viro6b5e1222013-06-19 13:21:03 +0400406 ino = vdir->d_fileno;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700407 type = CDT2DT(vdir->d_type);
Al Viroe924f252013-05-22 21:15:30 -0400408 if (!dir_emit(ctx, name.name, name.len, ino, type))
409 break;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410 }
411 /* we'll always have progress because d_reclen is unsigned and
412 * we've already established it is non-zero. */
Al Viroe924f252013-05-22 21:15:30 -0400413 ctx->pos += vdir->d_reclen;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700414 }
Al Viro5f47c7e2007-07-20 00:23:31 +0100415out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700416 kfree(vdir);
Al Viroe924f252013-05-22 21:15:30 -0400417 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700418}
419
Fabian Frederickb6250322015-02-17 13:45:25 -0800420/* file operations for directories */
421static int coda_readdir(struct file *coda_file, struct dir_context *ctx)
422{
423 struct coda_file_info *cfi;
424 struct file *host_file;
425 int ret;
426
427 cfi = CODA_FTOC(coda_file);
428 BUG_ON(!cfi || cfi->cfi_magic != CODA_MAGIC);
429 host_file = cfi->cfi_container;
430
Al Viro61922692016-04-20 23:08:32 -0400431 if (host_file->f_op->iterate || host_file->f_op->iterate_shared) {
Fabian Frederickb6250322015-02-17 13:45:25 -0800432 struct inode *host_inode = file_inode(host_file);
Fabian Frederickb6250322015-02-17 13:45:25 -0800433 ret = -ENOENT;
434 if (!IS_DEADDIR(host_inode)) {
Al Viro61922692016-04-20 23:08:32 -0400435 if (host_file->f_op->iterate_shared) {
436 inode_lock_shared(host_inode);
437 ret = host_file->f_op->iterate_shared(host_file, ctx);
438 file_accessed(host_file);
439 inode_unlock_shared(host_inode);
440 } else {
441 inode_lock(host_inode);
442 ret = host_file->f_op->iterate(host_file, ctx);
443 file_accessed(host_file);
444 inode_unlock(host_inode);
445 }
Fabian Frederickb6250322015-02-17 13:45:25 -0800446 }
Fabian Frederickb6250322015-02-17 13:45:25 -0800447 return ret;
448 }
449 /* Venus: we must read Venus dirents from a file */
450 return coda_venus_readdir(coda_file, ctx);
451}
452
Linus Torvalds1da177e2005-04-16 15:20:36 -0700453/* called when a cache lookup succeeds */
Al Viro0b728e12012-06-10 16:03:43 -0400454static int coda_dentry_revalidate(struct dentry *de, unsigned int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700455{
Nick Piggin34286d62011-01-07 17:49:57 +1100456 struct inode *inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700457 struct coda_inode_info *cii;
458
Al Viro0b728e12012-06-10 16:03:43 -0400459 if (flags & LOOKUP_RCU)
Nick Piggin34286d62011-01-07 17:49:57 +1100460 return -ECHILD;
461
David Howells2b0143b2015-03-17 22:25:59 +0000462 inode = d_inode(de);
Al Viroa7400222014-10-21 15:20:42 -0400463 if (!inode || is_root_inode(inode))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700464 goto out;
465 if (is_bad_inode(inode))
466 goto bad;
467
David Howells2b0143b2015-03-17 22:25:59 +0000468 cii = ITOC(d_inode(de));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700469 if (!(cii->c_flags & (C_PURGE | C_FLUSH)))
470 goto out;
471
472 shrink_dcache_parent(de);
473
474 /* propagate for a flush */
475 if (cii->c_flags & C_FLUSH)
476 coda_flag_inode_children(inode, C_FLUSH);
477
Al Viro84d08fa2013-07-05 18:59:33 +0400478 if (d_count(de) > 1)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700479 /* pretend it's valid, but don't change the flags */
480 goto out;
481
482 /* clear the flags. */
Yoshihisa Abeb5ce1d82010-10-25 02:03:44 -0400483 spin_lock(&cii->c_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700484 cii->c_flags &= ~(C_VATTR | C_PURGE | C_FLUSH);
Yoshihisa Abeb5ce1d82010-10-25 02:03:44 -0400485 spin_unlock(&cii->c_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700486bad:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700487 return 0;
488out:
Linus Torvalds1da177e2005-04-16 15:20:36 -0700489 return 1;
490}
491
492/*
493 * This is the callback from dput() when d_count is going to 0.
494 * We use this to unhash dentries with bad inodes.
495 */
Nick Pigginfe15ce42011-01-07 17:49:23 +1100496static int coda_dentry_delete(const struct dentry * dentry)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700497{
498 int flags;
499
David Howells2b0143b2015-03-17 22:25:59 +0000500 if (d_really_is_negative(dentry))
Linus Torvalds1da177e2005-04-16 15:20:36 -0700501 return 0;
502
David Howells2b0143b2015-03-17 22:25:59 +0000503 flags = (ITOC(d_inode(dentry))->c_flags) & C_PURGE;
504 if (is_bad_inode(d_inode(dentry)) || flags) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700505 return 1;
506 }
507 return 0;
508}
509
510
511
512/*
513 * This is called when we want to check if the inode has
514 * changed on the server. Coda makes this easy since the
515 * cache manager Venus issues a downcall to the kernel when this
516 * happens
517 */
Al Viro11d100d2013-10-04 18:17:02 -0400518int coda_revalidate_inode(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700519{
520 struct coda_vattr attr;
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400521 int error;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700522 int old_mode;
523 ino_t old_ino;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700524 struct coda_inode_info *cii = ITOC(inode);
525
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400526 if (!cii->c_flags)
527 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700528
529 if (cii->c_flags & (C_VATTR | C_PURGE | C_FLUSH)) {
530 error = venus_getattr(inode->i_sb, &(cii->c_fid), &attr);
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400531 if (error)
532 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700533
534 /* this inode may be lost if:
535 - it's ino changed
536 - type changes must be permitted for repair and
537 missing mount points.
538 */
539 old_mode = inode->i_mode;
540 old_ino = inode->i_ino;
541 coda_vattr_to_iattr(inode, &attr);
542
543 if ((old_mode & S_IFMT) != (inode->i_mode & S_IFMT)) {
Fabian Frederickf38cfb22014-06-06 14:36:19 -0700544 pr_warn("inode %ld, fid %s changed type!\n",
Fabian Frederickd9b4b312014-06-06 14:36:18 -0700545 inode->i_ino, coda_f2s(&(cii->c_fid)));
Linus Torvalds1da177e2005-04-16 15:20:36 -0700546 }
547
548 /* the following can happen when a local fid is replaced
549 with a global one, here we lose and declare the inode bad */
550 if (inode->i_ino != old_ino)
Yoshihisa Abef7cc02b82010-10-25 02:03:45 -0400551 return -EIO;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700552
553 coda_flag_inode_children(inode, C_FLUSH);
Yoshihisa Abeb5ce1d82010-10-25 02:03:44 -0400554
555 spin_lock(&cii->c_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700556 cii->c_flags &= ~(C_VATTR | C_PURGE | C_FLUSH);
Yoshihisa Abeb5ce1d82010-10-25 02:03:44 -0400557 spin_unlock(&cii->c_lock);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700558 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700559 return 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700560}
Fabian Frederickb6250322015-02-17 13:45:25 -0800561
562const struct dentry_operations coda_dentry_operations = {
563 .d_revalidate = coda_dentry_revalidate,
564 .d_delete = coda_dentry_delete,
565};
566
567const struct inode_operations coda_dir_inode_operations = {
568 .create = coda_create,
569 .lookup = coda_lookup,
570 .link = coda_link,
571 .unlink = coda_unlink,
572 .symlink = coda_symlink,
573 .mkdir = coda_mkdir,
574 .rmdir = coda_rmdir,
575 .mknod = CODA_EIO_ERROR,
576 .rename = coda_rename,
577 .permission = coda_permission,
578 .getattr = coda_getattr,
579 .setattr = coda_setattr,
580};
581
582const struct file_operations coda_dir_operations = {
583 .llseek = generic_file_llseek,
584 .read = generic_read_dir,
585 .iterate = coda_readdir,
586 .open = coda_open,
587 .release = coda_release,
588 .fsync = coda_fsync,
589};