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Miklos Szeredie5e55582005-09-09 13:10:28 -07001/*
2 FUSE: Filesystem in Userspace
Miklos Szeredi1729a162008-11-26 12:03:54 +01003 Copyright (C) 2001-2008 Miklos Szeredi <miklos@szeredi.hu>
Miklos Szeredie5e55582005-09-09 13:10:28 -07004
5 This program can be distributed under the terms of the GNU GPL.
6 See the file COPYING.
7*/
8
9#include "fuse_i.h"
10
11#include <linux/pagemap.h>
12#include <linux/file.h>
13#include <linux/gfp.h>
14#include <linux/sched.h>
15#include <linux/namei.h>
16
Miklos Szeredi0a0898c2006-07-30 03:04:10 -070017#if BITS_PER_LONG >= 64
18static inline void fuse_dentry_settime(struct dentry *entry, u64 time)
19{
20 entry->d_time = time;
21}
22
23static inline u64 fuse_dentry_time(struct dentry *entry)
24{
25 return entry->d_time;
26}
27#else
28/*
29 * On 32 bit archs store the high 32 bits of time in d_fsdata
30 */
31static void fuse_dentry_settime(struct dentry *entry, u64 time)
32{
33 entry->d_time = time;
34 entry->d_fsdata = (void *) (unsigned long) (time >> 32);
35}
36
37static u64 fuse_dentry_time(struct dentry *entry)
38{
39 return (u64) entry->d_time +
40 ((u64) (unsigned long) entry->d_fsdata << 32);
41}
42#endif
43
Miklos Szeredi6f9f1182006-01-06 00:19:39 -080044/*
45 * FUSE caches dentries and attributes with separate timeout. The
46 * time in jiffies until the dentry/attributes are valid is stored in
47 * dentry->d_time and fuse_inode->i_time respectively.
48 */
49
50/*
51 * Calculate the time in jiffies until a dentry/attributes are valid
52 */
Miklos Szeredi0a0898c2006-07-30 03:04:10 -070053static u64 time_to_jiffies(unsigned long sec, unsigned long nsec)
Miklos Szeredie5e55582005-09-09 13:10:28 -070054{
Miklos Szeredi685d16d2006-07-30 03:04:08 -070055 if (sec || nsec) {
56 struct timespec ts = {sec, nsec};
Miklos Szeredi0a0898c2006-07-30 03:04:10 -070057 return get_jiffies_64() + timespec_to_jiffies(&ts);
Miklos Szeredi685d16d2006-07-30 03:04:08 -070058 } else
Miklos Szeredi0a0898c2006-07-30 03:04:10 -070059 return 0;
Miklos Szeredie5e55582005-09-09 13:10:28 -070060}
61
Miklos Szeredi6f9f1182006-01-06 00:19:39 -080062/*
63 * Set dentry and possibly attribute timeouts from the lookup/mk*
64 * replies
65 */
Miklos Szeredi1fb69e72007-10-18 03:06:58 -070066static void fuse_change_entry_timeout(struct dentry *entry,
67 struct fuse_entry_out *o)
Miklos Szeredi0aa7c692006-01-06 00:19:34 -080068{
Miklos Szeredi0a0898c2006-07-30 03:04:10 -070069 fuse_dentry_settime(entry,
70 time_to_jiffies(o->entry_valid, o->entry_valid_nsec));
Miklos Szeredi1fb69e72007-10-18 03:06:58 -070071}
72
73static u64 attr_timeout(struct fuse_attr_out *o)
74{
75 return time_to_jiffies(o->attr_valid, o->attr_valid_nsec);
76}
77
78static u64 entry_attr_timeout(struct fuse_entry_out *o)
79{
80 return time_to_jiffies(o->attr_valid, o->attr_valid_nsec);
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -080081}
82
Miklos Szeredi6f9f1182006-01-06 00:19:39 -080083/*
84 * Mark the attributes as stale, so that at the next call to
85 * ->getattr() they will be fetched from userspace
86 */
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -080087void fuse_invalidate_attr(struct inode *inode)
88{
Miklos Szeredi0a0898c2006-07-30 03:04:10 -070089 get_fuse_inode(inode)->i_time = 0;
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -080090}
91
Miklos Szeredi6f9f1182006-01-06 00:19:39 -080092/*
93 * Just mark the entry as stale, so that a next attempt to look it up
94 * will result in a new lookup call to userspace
95 *
96 * This is called when a dentry is about to become negative and the
97 * timeout is unknown (unlink, rmdir, rename and in some cases
98 * lookup)
99 */
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700100void fuse_invalidate_entry_cache(struct dentry *entry)
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -0800101{
Miklos Szeredi0a0898c2006-07-30 03:04:10 -0700102 fuse_dentry_settime(entry, 0);
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -0800103}
104
Miklos Szeredi6f9f1182006-01-06 00:19:39 -0800105/*
106 * Same as fuse_invalidate_entry_cache(), but also try to remove the
107 * dentry from the hash
108 */
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -0800109static void fuse_invalidate_entry(struct dentry *entry)
110{
111 d_invalidate(entry);
112 fuse_invalidate_entry_cache(entry);
Miklos Szeredi0aa7c692006-01-06 00:19:34 -0800113}
114
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700115static void fuse_lookup_init(struct fuse_conn *fc, struct fuse_req *req,
116 u64 nodeid, struct qstr *name,
Miklos Szeredie5e55582005-09-09 13:10:28 -0700117 struct fuse_entry_out *outarg)
118{
Miklos Szeredi0e9663e2007-10-18 03:07:05 -0700119 memset(outarg, 0, sizeof(struct fuse_entry_out));
Miklos Szeredie5e55582005-09-09 13:10:28 -0700120 req->in.h.opcode = FUSE_LOOKUP;
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700121 req->in.h.nodeid = nodeid;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700122 req->in.numargs = 1;
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700123 req->in.args[0].size = name->len + 1;
124 req->in.args[0].value = name->name;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700125 req->out.numargs = 1;
Miklos Szeredi0e9663e2007-10-18 03:07:05 -0700126 if (fc->minor < 9)
127 req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE;
128 else
129 req->out.args[0].size = sizeof(struct fuse_entry_out);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700130 req->out.args[0].value = outarg;
131}
132
Miklos Szeredi5c5c5e52008-04-30 00:54:43 -0700133u64 fuse_get_attr_version(struct fuse_conn *fc)
Miklos Szeredi7dca9fd2007-11-28 16:21:59 -0800134{
135 u64 curr_version;
136
137 /*
138 * The spin lock isn't actually needed on 64bit archs, but we
139 * don't yet care too much about such optimizations.
140 */
141 spin_lock(&fc->lock);
142 curr_version = fc->attr_version;
143 spin_unlock(&fc->lock);
144
145 return curr_version;
146}
147
Miklos Szeredi6f9f1182006-01-06 00:19:39 -0800148/*
149 * Check whether the dentry is still valid
150 *
151 * If the entry validity timeout has expired and the dentry is
152 * positive, try to redo the lookup. If the lookup results in a
153 * different inode, then let the VFS invalidate the dentry and redo
154 * the lookup once more. If the lookup results in the same inode,
155 * then refresh the attributes, timeouts and mark the dentry valid.
156 */
Miklos Szeredie5e55582005-09-09 13:10:28 -0700157static int fuse_dentry_revalidate(struct dentry *entry, struct nameidata *nd)
158{
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -0800159 struct inode *inode = entry->d_inode;
160
161 if (inode && is_bad_inode(inode))
Miklos Szeredie5e55582005-09-09 13:10:28 -0700162 return 0;
Miklos Szeredi0a0898c2006-07-30 03:04:10 -0700163 else if (fuse_dentry_time(entry) < get_jiffies_64()) {
Miklos Szeredie5e55582005-09-09 13:10:28 -0700164 int err;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700165 struct fuse_entry_out outarg;
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -0800166 struct fuse_conn *fc;
167 struct fuse_req *req;
Miklos Szeredi2d510132006-11-25 11:09:20 -0800168 struct fuse_req *forget_req;
Miklos Szeredie956edd2006-10-17 00:10:12 -0700169 struct dentry *parent;
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700170 u64 attr_version;
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -0800171
Miklos Szeredi50322fe2006-02-28 16:59:03 -0800172 /* For negative dentries, always do a fresh lookup */
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -0800173 if (!inode)
174 return 0;
175
176 fc = get_fuse_conn(inode);
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700177 req = fuse_get_req(fc);
178 if (IS_ERR(req))
Miklos Szeredie5e55582005-09-09 13:10:28 -0700179 return 0;
180
Miklos Szeredi2d510132006-11-25 11:09:20 -0800181 forget_req = fuse_get_req(fc);
182 if (IS_ERR(forget_req)) {
183 fuse_put_request(fc, req);
184 return 0;
185 }
186
Miklos Szeredi7dca9fd2007-11-28 16:21:59 -0800187 attr_version = fuse_get_attr_version(fc);
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700188
Miklos Szeredie956edd2006-10-17 00:10:12 -0700189 parent = dget_parent(entry);
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700190 fuse_lookup_init(fc, req, get_node_id(parent->d_inode),
191 &entry->d_name, &outarg);
Tejun Heob93f8582008-11-26 12:03:55 +0100192 fuse_request_send(fc, req);
Miklos Szeredie956edd2006-10-17 00:10:12 -0700193 dput(parent);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700194 err = req->out.h.error;
Miklos Szeredi2d510132006-11-25 11:09:20 -0800195 fuse_put_request(fc, req);
Miklos Szeredi50322fe2006-02-28 16:59:03 -0800196 /* Zero nodeid is same as -ENOENT */
197 if (!err && !outarg.nodeid)
198 err = -ENOENT;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700199 if (!err) {
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -0800200 struct fuse_inode *fi = get_fuse_inode(inode);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700201 if (outarg.nodeid != get_node_id(inode)) {
Miklos Szeredi2d510132006-11-25 11:09:20 -0800202 fuse_send_forget(fc, forget_req,
203 outarg.nodeid, 1);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700204 return 0;
205 }
Miklos Szeredi8da5ff22006-10-17 00:10:08 -0700206 spin_lock(&fc->lock);
Miklos Szeredi1729a162008-11-26 12:03:54 +0100207 fi->nlookup++;
Miklos Szeredi8da5ff22006-10-17 00:10:08 -0700208 spin_unlock(&fc->lock);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700209 }
Miklos Szeredi2d510132006-11-25 11:09:20 -0800210 fuse_put_request(fc, forget_req);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700211 if (err || (outarg.attr.mode ^ inode->i_mode) & S_IFMT)
Miklos Szeredie5e55582005-09-09 13:10:28 -0700212 return 0;
213
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700214 fuse_change_attributes(inode, &outarg.attr,
215 entry_attr_timeout(&outarg),
216 attr_version);
217 fuse_change_entry_timeout(entry, &outarg);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700218 }
219 return 1;
220}
221
Miklos Szeredi8bfc0162006-01-16 22:14:28 -0800222static int invalid_nodeid(u64 nodeid)
Miklos Szeredi2827d0b22005-11-28 13:44:16 -0800223{
224 return !nodeid || nodeid == FUSE_ROOT_ID;
225}
226
Al Viro42695902009-02-20 05:59:13 +0000227const struct dentry_operations fuse_dentry_operations = {
Miklos Szeredie5e55582005-09-09 13:10:28 -0700228 .d_revalidate = fuse_dentry_revalidate,
229};
230
Timo Savolaa5bfffac2007-04-08 16:04:00 -0700231int fuse_valid_type(int m)
Miklos Szeredi39ee0592006-01-06 00:19:43 -0800232{
233 return S_ISREG(m) || S_ISDIR(m) || S_ISLNK(m) || S_ISCHR(m) ||
234 S_ISBLK(m) || S_ISFIFO(m) || S_ISSOCK(m);
235}
236
Miklos Szeredid2a85162006-10-17 00:10:11 -0700237/*
238 * Add a directory inode to a dentry, ensuring that no other dentry
239 * refers to this inode. Called with fc->inst_mutex.
240 */
Miklos Szeredi0de62562008-07-25 01:48:59 -0700241static struct dentry *fuse_d_add_directory(struct dentry *entry,
242 struct inode *inode)
Miklos Szeredid2a85162006-10-17 00:10:11 -0700243{
244 struct dentry *alias = d_find_alias(inode);
Miklos Szeredi0de62562008-07-25 01:48:59 -0700245 if (alias && !(alias->d_flags & DCACHE_DISCONNECTED)) {
Miklos Szeredid2a85162006-10-17 00:10:11 -0700246 /* This tries to shrink the subtree below alias */
247 fuse_invalidate_entry(alias);
248 dput(alias);
249 if (!list_empty(&inode->i_dentry))
Miklos Szeredi0de62562008-07-25 01:48:59 -0700250 return ERR_PTR(-EBUSY);
251 } else {
252 dput(alias);
Miklos Szeredid2a85162006-10-17 00:10:11 -0700253 }
Miklos Szeredi0de62562008-07-25 01:48:59 -0700254 return d_splice_alias(inode, entry);
Miklos Szeredid2a85162006-10-17 00:10:11 -0700255}
256
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700257int fuse_lookup_name(struct super_block *sb, u64 nodeid, struct qstr *name,
258 struct fuse_entry_out *outarg, struct inode **inode)
259{
260 struct fuse_conn *fc = get_fuse_conn_super(sb);
261 struct fuse_req *req;
262 struct fuse_req *forget_req;
263 u64 attr_version;
264 int err;
265
266 *inode = NULL;
267 err = -ENAMETOOLONG;
268 if (name->len > FUSE_NAME_MAX)
269 goto out;
270
271 req = fuse_get_req(fc);
272 err = PTR_ERR(req);
273 if (IS_ERR(req))
274 goto out;
275
276 forget_req = fuse_get_req(fc);
277 err = PTR_ERR(forget_req);
278 if (IS_ERR(forget_req)) {
279 fuse_put_request(fc, req);
280 goto out;
281 }
282
283 attr_version = fuse_get_attr_version(fc);
284
285 fuse_lookup_init(fc, req, nodeid, name, outarg);
Tejun Heob93f8582008-11-26 12:03:55 +0100286 fuse_request_send(fc, req);
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700287 err = req->out.h.error;
288 fuse_put_request(fc, req);
289 /* Zero nodeid is same as -ENOENT, but with valid timeout */
290 if (err || !outarg->nodeid)
291 goto out_put_forget;
292
293 err = -EIO;
294 if (!outarg->nodeid)
295 goto out_put_forget;
296 if (!fuse_valid_type(outarg->attr.mode))
297 goto out_put_forget;
298
299 *inode = fuse_iget(sb, outarg->nodeid, outarg->generation,
300 &outarg->attr, entry_attr_timeout(outarg),
301 attr_version);
302 err = -ENOMEM;
303 if (!*inode) {
304 fuse_send_forget(fc, forget_req, outarg->nodeid, 1);
305 goto out;
306 }
307 err = 0;
308
309 out_put_forget:
310 fuse_put_request(fc, forget_req);
311 out:
312 return err;
313}
314
Miklos Szeredi0aa7c692006-01-06 00:19:34 -0800315static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
316 struct nameidata *nd)
Miklos Szeredie5e55582005-09-09 13:10:28 -0700317{
318 int err;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700319 struct fuse_entry_out outarg;
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700320 struct inode *inode;
Miklos Szeredi0de62562008-07-25 01:48:59 -0700321 struct dentry *newent;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700322 struct fuse_conn *fc = get_fuse_conn(dir);
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700323 bool outarg_valid = true;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700324
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700325 err = fuse_lookup_name(dir->i_sb, get_node_id(dir), &entry->d_name,
326 &outarg, &inode);
327 if (err == -ENOENT) {
328 outarg_valid = false;
329 err = 0;
Miklos Szeredi2d510132006-11-25 11:09:20 -0800330 }
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700331 if (err)
332 goto out_err;
Miklos Szeredi2d510132006-11-25 11:09:20 -0800333
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700334 err = -EIO;
335 if (inode && get_node_id(inode) == FUSE_ROOT_ID)
336 goto out_iput;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700337
Miklos Szeredid2a85162006-10-17 00:10:11 -0700338 if (inode && S_ISDIR(inode->i_mode)) {
339 mutex_lock(&fc->inst_mutex);
Miklos Szeredi0de62562008-07-25 01:48:59 -0700340 newent = fuse_d_add_directory(entry, inode);
Miklos Szeredid2a85162006-10-17 00:10:11 -0700341 mutex_unlock(&fc->inst_mutex);
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700342 err = PTR_ERR(newent);
343 if (IS_ERR(newent))
344 goto out_iput;
345 } else {
Miklos Szeredi0de62562008-07-25 01:48:59 -0700346 newent = d_splice_alias(inode, entry);
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700347 }
Miklos Szeredid2a85162006-10-17 00:10:11 -0700348
Miklos Szeredi0de62562008-07-25 01:48:59 -0700349 entry = newent ? newent : entry;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700350 entry->d_op = &fuse_dentry_operations;
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700351 if (outarg_valid)
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700352 fuse_change_entry_timeout(entry, &outarg);
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -0800353 else
354 fuse_invalidate_entry_cache(entry);
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700355
Miklos Szeredi0de62562008-07-25 01:48:59 -0700356 return newent;
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700357
358 out_iput:
359 iput(inode);
360 out_err:
361 return ERR_PTR(err);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700362}
363
Miklos Szeredi6f9f1182006-01-06 00:19:39 -0800364/*
365 * Atomic create+open operation
366 *
367 * If the filesystem doesn't support this, then fall back to separate
368 * 'mknod' + 'open' requests.
369 */
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800370static int fuse_create_open(struct inode *dir, struct dentry *entry, int mode,
371 struct nameidata *nd)
372{
373 int err;
374 struct inode *inode;
375 struct fuse_conn *fc = get_fuse_conn(dir);
376 struct fuse_req *req;
Miklos Szeredi51eb01e2006-06-25 05:48:50 -0700377 struct fuse_req *forget_req;
Miklos Szeredie0a43dd2009-06-30 20:12:23 +0200378 struct fuse_create_in inarg;
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800379 struct fuse_open_out outopen;
380 struct fuse_entry_out outentry;
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800381 struct fuse_file *ff;
382 struct file *file;
383 int flags = nd->intent.open.flags - 1;
384
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800385 if (fc->no_create)
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700386 return -ENOSYS;
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800387
Csaba Henk1b732392009-11-27 19:30:14 +0530388 if (flags & O_DIRECT)
389 return -EINVAL;
390
Miklos Szeredi51eb01e2006-06-25 05:48:50 -0700391 forget_req = fuse_get_req(fc);
392 if (IS_ERR(forget_req))
393 return PTR_ERR(forget_req);
394
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700395 req = fuse_get_req(fc);
Miklos Szeredi51eb01e2006-06-25 05:48:50 -0700396 err = PTR_ERR(req);
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700397 if (IS_ERR(req))
Miklos Szeredi51eb01e2006-06-25 05:48:50 -0700398 goto out_put_forget_req;
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800399
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700400 err = -ENOMEM;
Tejun Heoacf99432008-11-26 12:03:55 +0100401 ff = fuse_file_alloc(fc);
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800402 if (!ff)
403 goto out_put_request;
404
Miklos Szeredie0a43dd2009-06-30 20:12:23 +0200405 if (!fc->dont_mask)
406 mode &= ~current_umask();
407
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800408 flags &= ~O_NOCTTY;
409 memset(&inarg, 0, sizeof(inarg));
Miklos Szeredi0e9663e2007-10-18 03:07:05 -0700410 memset(&outentry, 0, sizeof(outentry));
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800411 inarg.flags = flags;
412 inarg.mode = mode;
Miklos Szeredie0a43dd2009-06-30 20:12:23 +0200413 inarg.umask = current_umask();
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800414 req->in.h.opcode = FUSE_CREATE;
415 req->in.h.nodeid = get_node_id(dir);
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800416 req->in.numargs = 2;
Miklos Szeredie0a43dd2009-06-30 20:12:23 +0200417 req->in.args[0].size = fc->minor < 12 ? sizeof(struct fuse_open_in) :
418 sizeof(inarg);
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800419 req->in.args[0].value = &inarg;
420 req->in.args[1].size = entry->d_name.len + 1;
421 req->in.args[1].value = entry->d_name.name;
422 req->out.numargs = 2;
Miklos Szeredi0e9663e2007-10-18 03:07:05 -0700423 if (fc->minor < 9)
424 req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE;
425 else
426 req->out.args[0].size = sizeof(outentry);
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800427 req->out.args[0].value = &outentry;
428 req->out.args[1].size = sizeof(outopen);
429 req->out.args[1].value = &outopen;
Tejun Heob93f8582008-11-26 12:03:55 +0100430 fuse_request_send(fc, req);
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800431 err = req->out.h.error;
432 if (err) {
433 if (err == -ENOSYS)
434 fc->no_create = 1;
435 goto out_free_ff;
436 }
437
438 err = -EIO;
Miklos Szeredi2827d0b22005-11-28 13:44:16 -0800439 if (!S_ISREG(outentry.attr.mode) || invalid_nodeid(outentry.nodeid))
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800440 goto out_free_ff;
441
Miklos Szeredi51eb01e2006-06-25 05:48:50 -0700442 fuse_put_request(fc, req);
Miklos Szeredic7b71432009-04-28 16:56:37 +0200443 ff->fh = outopen.fh;
444 ff->nodeid = outentry.nodeid;
445 ff->open_flags = outopen.open_flags;
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800446 inode = fuse_iget(dir->i_sb, outentry.nodeid, outentry.generation,
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700447 &outentry.attr, entry_attr_timeout(&outentry), 0);
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800448 if (!inode) {
449 flags &= ~(O_CREAT | O_EXCL | O_TRUNC);
Miklos Szeredi8b0797a2009-04-28 16:56:39 +0200450 fuse_sync_release(ff, flags);
Miklos Szeredi51eb01e2006-06-25 05:48:50 -0700451 fuse_send_forget(fc, forget_req, outentry.nodeid, 1);
452 return -ENOMEM;
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800453 }
Miklos Szeredi51eb01e2006-06-25 05:48:50 -0700454 fuse_put_request(fc, forget_req);
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800455 d_instantiate(entry, inode);
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700456 fuse_change_entry_timeout(entry, &outentry);
Miklos Szeredi0952b2a2008-02-06 01:38:38 -0800457 fuse_invalidate_attr(dir);
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800458 file = lookup_instantiate_filp(nd, entry, generic_file_open);
459 if (IS_ERR(file)) {
Miklos Szeredi8b0797a2009-04-28 16:56:39 +0200460 fuse_sync_release(ff, flags);
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800461 return PTR_ERR(file);
462 }
Miklos Szeredic7b71432009-04-28 16:56:37 +0200463 file->private_data = fuse_file_get(ff);
464 fuse_finish_open(inode, file);
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800465 return 0;
466
467 out_free_ff:
468 fuse_file_free(ff);
469 out_put_request:
470 fuse_put_request(fc, req);
Miklos Szeredi51eb01e2006-06-25 05:48:50 -0700471 out_put_forget_req:
472 fuse_put_request(fc, forget_req);
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800473 return err;
474}
475
Miklos Szeredi6f9f1182006-01-06 00:19:39 -0800476/*
477 * Code shared between mknod, mkdir, symlink and link
478 */
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700479static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req,
480 struct inode *dir, struct dentry *entry,
481 int mode)
482{
483 struct fuse_entry_out outarg;
484 struct inode *inode;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700485 int err;
Miklos Szeredi2d510132006-11-25 11:09:20 -0800486 struct fuse_req *forget_req;
487
488 forget_req = fuse_get_req(fc);
489 if (IS_ERR(forget_req)) {
490 fuse_put_request(fc, req);
491 return PTR_ERR(forget_req);
492 }
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700493
Miklos Szeredi0e9663e2007-10-18 03:07:05 -0700494 memset(&outarg, 0, sizeof(outarg));
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700495 req->in.h.nodeid = get_node_id(dir);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700496 req->out.numargs = 1;
Miklos Szeredi0e9663e2007-10-18 03:07:05 -0700497 if (fc->minor < 9)
498 req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE;
499 else
500 req->out.args[0].size = sizeof(outarg);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700501 req->out.args[0].value = &outarg;
Tejun Heob93f8582008-11-26 12:03:55 +0100502 fuse_request_send(fc, req);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700503 err = req->out.h.error;
Miklos Szeredi2d510132006-11-25 11:09:20 -0800504 fuse_put_request(fc, req);
505 if (err)
506 goto out_put_forget_req;
507
Miklos Szeredi39ee0592006-01-06 00:19:43 -0800508 err = -EIO;
509 if (invalid_nodeid(outarg.nodeid))
Miklos Szeredi2d510132006-11-25 11:09:20 -0800510 goto out_put_forget_req;
Miklos Szeredi39ee0592006-01-06 00:19:43 -0800511
512 if ((outarg.attr.mode ^ mode) & S_IFMT)
Miklos Szeredi2d510132006-11-25 11:09:20 -0800513 goto out_put_forget_req;
Miklos Szeredi39ee0592006-01-06 00:19:43 -0800514
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700515 inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation,
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700516 &outarg.attr, entry_attr_timeout(&outarg), 0);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700517 if (!inode) {
Miklos Szeredi2d510132006-11-25 11:09:20 -0800518 fuse_send_forget(fc, forget_req, outarg.nodeid, 1);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700519 return -ENOMEM;
520 }
Miklos Szeredi2d510132006-11-25 11:09:20 -0800521 fuse_put_request(fc, forget_req);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700522
Miklos Szeredid2a85162006-10-17 00:10:11 -0700523 if (S_ISDIR(inode->i_mode)) {
524 struct dentry *alias;
525 mutex_lock(&fc->inst_mutex);
526 alias = d_find_alias(inode);
527 if (alias) {
528 /* New directory must have moved since mkdir */
529 mutex_unlock(&fc->inst_mutex);
530 dput(alias);
531 iput(inode);
532 return -EBUSY;
533 }
534 d_instantiate(entry, inode);
535 mutex_unlock(&fc->inst_mutex);
536 } else
537 d_instantiate(entry, inode);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700538
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700539 fuse_change_entry_timeout(entry, &outarg);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700540 fuse_invalidate_attr(dir);
541 return 0;
Miklos Szeredi39ee0592006-01-06 00:19:43 -0800542
Miklos Szeredi2d510132006-11-25 11:09:20 -0800543 out_put_forget_req:
544 fuse_put_request(fc, forget_req);
Miklos Szeredi39ee0592006-01-06 00:19:43 -0800545 return err;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700546}
547
548static int fuse_mknod(struct inode *dir, struct dentry *entry, int mode,
549 dev_t rdev)
550{
551 struct fuse_mknod_in inarg;
552 struct fuse_conn *fc = get_fuse_conn(dir);
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700553 struct fuse_req *req = fuse_get_req(fc);
554 if (IS_ERR(req))
555 return PTR_ERR(req);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700556
Miklos Szeredie0a43dd2009-06-30 20:12:23 +0200557 if (!fc->dont_mask)
558 mode &= ~current_umask();
559
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700560 memset(&inarg, 0, sizeof(inarg));
561 inarg.mode = mode;
562 inarg.rdev = new_encode_dev(rdev);
Miklos Szeredie0a43dd2009-06-30 20:12:23 +0200563 inarg.umask = current_umask();
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700564 req->in.h.opcode = FUSE_MKNOD;
565 req->in.numargs = 2;
Miklos Szeredie0a43dd2009-06-30 20:12:23 +0200566 req->in.args[0].size = fc->minor < 12 ? FUSE_COMPAT_MKNOD_IN_SIZE :
567 sizeof(inarg);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700568 req->in.args[0].value = &inarg;
569 req->in.args[1].size = entry->d_name.len + 1;
570 req->in.args[1].value = entry->d_name.name;
571 return create_new_entry(fc, req, dir, entry, mode);
572}
573
574static int fuse_create(struct inode *dir, struct dentry *entry, int mode,
575 struct nameidata *nd)
576{
Miklos Szeredib9ba3472007-05-23 13:57:32 -0700577 if (nd && (nd->flags & LOOKUP_OPEN)) {
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800578 int err = fuse_create_open(dir, entry, mode, nd);
579 if (err != -ENOSYS)
580 return err;
581 /* Fall back on mknod */
582 }
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700583 return fuse_mknod(dir, entry, mode, 0);
584}
585
586static int fuse_mkdir(struct inode *dir, struct dentry *entry, int mode)
587{
588 struct fuse_mkdir_in inarg;
589 struct fuse_conn *fc = get_fuse_conn(dir);
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700590 struct fuse_req *req = fuse_get_req(fc);
591 if (IS_ERR(req))
592 return PTR_ERR(req);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700593
Miklos Szeredie0a43dd2009-06-30 20:12:23 +0200594 if (!fc->dont_mask)
595 mode &= ~current_umask();
596
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700597 memset(&inarg, 0, sizeof(inarg));
598 inarg.mode = mode;
Miklos Szeredie0a43dd2009-06-30 20:12:23 +0200599 inarg.umask = current_umask();
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700600 req->in.h.opcode = FUSE_MKDIR;
601 req->in.numargs = 2;
602 req->in.args[0].size = sizeof(inarg);
603 req->in.args[0].value = &inarg;
604 req->in.args[1].size = entry->d_name.len + 1;
605 req->in.args[1].value = entry->d_name.name;
606 return create_new_entry(fc, req, dir, entry, S_IFDIR);
607}
608
609static int fuse_symlink(struct inode *dir, struct dentry *entry,
610 const char *link)
611{
612 struct fuse_conn *fc = get_fuse_conn(dir);
613 unsigned len = strlen(link) + 1;
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700614 struct fuse_req *req = fuse_get_req(fc);
615 if (IS_ERR(req))
616 return PTR_ERR(req);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700617
618 req->in.h.opcode = FUSE_SYMLINK;
619 req->in.numargs = 2;
620 req->in.args[0].size = entry->d_name.len + 1;
621 req->in.args[0].value = entry->d_name.name;
622 req->in.args[1].size = len;
623 req->in.args[1].value = link;
624 return create_new_entry(fc, req, dir, entry, S_IFLNK);
625}
626
627static int fuse_unlink(struct inode *dir, struct dentry *entry)
628{
629 int err;
630 struct fuse_conn *fc = get_fuse_conn(dir);
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700631 struct fuse_req *req = fuse_get_req(fc);
632 if (IS_ERR(req))
633 return PTR_ERR(req);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700634
635 req->in.h.opcode = FUSE_UNLINK;
636 req->in.h.nodeid = get_node_id(dir);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700637 req->in.numargs = 1;
638 req->in.args[0].size = entry->d_name.len + 1;
639 req->in.args[0].value = entry->d_name.name;
Tejun Heob93f8582008-11-26 12:03:55 +0100640 fuse_request_send(fc, req);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700641 err = req->out.h.error;
642 fuse_put_request(fc, req);
643 if (!err) {
644 struct inode *inode = entry->d_inode;
645
Miklos Szeredi1729a162008-11-26 12:03:54 +0100646 /*
647 * Set nlink to zero so the inode can be cleared, if the inode
648 * does have more links this will be discovered at the next
649 * lookup/getattr.
650 */
Dave Hansence71ec32006-09-30 23:29:06 -0700651 clear_nlink(inode);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700652 fuse_invalidate_attr(inode);
653 fuse_invalidate_attr(dir);
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -0800654 fuse_invalidate_entry_cache(entry);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700655 } else if (err == -EINTR)
656 fuse_invalidate_entry(entry);
657 return err;
658}
659
660static int fuse_rmdir(struct inode *dir, struct dentry *entry)
661{
662 int err;
663 struct fuse_conn *fc = get_fuse_conn(dir);
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700664 struct fuse_req *req = fuse_get_req(fc);
665 if (IS_ERR(req))
666 return PTR_ERR(req);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700667
668 req->in.h.opcode = FUSE_RMDIR;
669 req->in.h.nodeid = get_node_id(dir);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700670 req->in.numargs = 1;
671 req->in.args[0].size = entry->d_name.len + 1;
672 req->in.args[0].value = entry->d_name.name;
Tejun Heob93f8582008-11-26 12:03:55 +0100673 fuse_request_send(fc, req);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700674 err = req->out.h.error;
675 fuse_put_request(fc, req);
676 if (!err) {
Dave Hansence71ec32006-09-30 23:29:06 -0700677 clear_nlink(entry->d_inode);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700678 fuse_invalidate_attr(dir);
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -0800679 fuse_invalidate_entry_cache(entry);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700680 } else if (err == -EINTR)
681 fuse_invalidate_entry(entry);
682 return err;
683}
684
685static int fuse_rename(struct inode *olddir, struct dentry *oldent,
686 struct inode *newdir, struct dentry *newent)
687{
688 int err;
689 struct fuse_rename_in inarg;
690 struct fuse_conn *fc = get_fuse_conn(olddir);
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700691 struct fuse_req *req = fuse_get_req(fc);
692 if (IS_ERR(req))
693 return PTR_ERR(req);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700694
695 memset(&inarg, 0, sizeof(inarg));
696 inarg.newdir = get_node_id(newdir);
697 req->in.h.opcode = FUSE_RENAME;
698 req->in.h.nodeid = get_node_id(olddir);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700699 req->in.numargs = 3;
700 req->in.args[0].size = sizeof(inarg);
701 req->in.args[0].value = &inarg;
702 req->in.args[1].size = oldent->d_name.len + 1;
703 req->in.args[1].value = oldent->d_name.name;
704 req->in.args[2].size = newent->d_name.len + 1;
705 req->in.args[2].value = newent->d_name.name;
Tejun Heob93f8582008-11-26 12:03:55 +0100706 fuse_request_send(fc, req);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700707 err = req->out.h.error;
708 fuse_put_request(fc, req);
709 if (!err) {
Miklos Szeredi08b63302007-11-28 16:22:03 -0800710 /* ctime changes */
711 fuse_invalidate_attr(oldent->d_inode);
712
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700713 fuse_invalidate_attr(olddir);
714 if (olddir != newdir)
715 fuse_invalidate_attr(newdir);
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -0800716
717 /* newent will end up negative */
Miklos Szeredi5219f342009-11-04 10:24:52 +0100718 if (newent->d_inode) {
719 fuse_invalidate_attr(newent->d_inode);
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -0800720 fuse_invalidate_entry_cache(newent);
Miklos Szeredi5219f342009-11-04 10:24:52 +0100721 }
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700722 } else if (err == -EINTR) {
723 /* If request was interrupted, DEITY only knows if the
724 rename actually took place. If the invalidation
725 fails (e.g. some process has CWD under the renamed
726 directory), then there can be inconsistency between
727 the dcache and the real filesystem. Tough luck. */
728 fuse_invalidate_entry(oldent);
729 if (newent->d_inode)
730 fuse_invalidate_entry(newent);
731 }
732
733 return err;
734}
735
736static int fuse_link(struct dentry *entry, struct inode *newdir,
737 struct dentry *newent)
738{
739 int err;
740 struct fuse_link_in inarg;
741 struct inode *inode = entry->d_inode;
742 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700743 struct fuse_req *req = fuse_get_req(fc);
744 if (IS_ERR(req))
745 return PTR_ERR(req);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700746
747 memset(&inarg, 0, sizeof(inarg));
748 inarg.oldnodeid = get_node_id(inode);
749 req->in.h.opcode = FUSE_LINK;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700750 req->in.numargs = 2;
751 req->in.args[0].size = sizeof(inarg);
752 req->in.args[0].value = &inarg;
753 req->in.args[1].size = newent->d_name.len + 1;
754 req->in.args[1].value = newent->d_name.name;
755 err = create_new_entry(fc, req, newdir, newent, inode->i_mode);
756 /* Contrary to "normal" filesystems it can happen that link
757 makes two "logical" inodes point to the same "physical"
758 inode. We invalidate the attributes of the old one, so it
759 will reflect changes in the backing inode (link count,
760 etc.)
761 */
762 if (!err || err == -EINTR)
763 fuse_invalidate_attr(inode);
764 return err;
765}
766
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700767static void fuse_fillattr(struct inode *inode, struct fuse_attr *attr,
768 struct kstat *stat)
769{
770 stat->dev = inode->i_sb->s_dev;
771 stat->ino = attr->ino;
772 stat->mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777);
773 stat->nlink = attr->nlink;
774 stat->uid = attr->uid;
775 stat->gid = attr->gid;
776 stat->rdev = inode->i_rdev;
777 stat->atime.tv_sec = attr->atime;
778 stat->atime.tv_nsec = attr->atimensec;
779 stat->mtime.tv_sec = attr->mtime;
780 stat->mtime.tv_nsec = attr->mtimensec;
781 stat->ctime.tv_sec = attr->ctime;
782 stat->ctime.tv_nsec = attr->ctimensec;
783 stat->size = attr->size;
784 stat->blocks = attr->blocks;
785 stat->blksize = (1 << inode->i_blkbits);
786}
787
Miklos Szeredic79e3222007-10-18 03:06:59 -0700788static int fuse_do_getattr(struct inode *inode, struct kstat *stat,
789 struct file *file)
Miklos Szeredie5e55582005-09-09 13:10:28 -0700790{
791 int err;
Miklos Szeredic79e3222007-10-18 03:06:59 -0700792 struct fuse_getattr_in inarg;
793 struct fuse_attr_out outarg;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700794 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700795 struct fuse_req *req;
796 u64 attr_version;
797
798 req = fuse_get_req(fc);
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700799 if (IS_ERR(req))
800 return PTR_ERR(req);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700801
Miklos Szeredi7dca9fd2007-11-28 16:21:59 -0800802 attr_version = fuse_get_attr_version(fc);
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700803
Miklos Szeredic79e3222007-10-18 03:06:59 -0700804 memset(&inarg, 0, sizeof(inarg));
Miklos Szeredi0e9663e2007-10-18 03:07:05 -0700805 memset(&outarg, 0, sizeof(outarg));
Miklos Szeredic79e3222007-10-18 03:06:59 -0700806 /* Directories have separate file-handle space */
807 if (file && S_ISREG(inode->i_mode)) {
808 struct fuse_file *ff = file->private_data;
809
810 inarg.getattr_flags |= FUSE_GETATTR_FH;
811 inarg.fh = ff->fh;
812 }
Miklos Szeredie5e55582005-09-09 13:10:28 -0700813 req->in.h.opcode = FUSE_GETATTR;
814 req->in.h.nodeid = get_node_id(inode);
Miklos Szeredic79e3222007-10-18 03:06:59 -0700815 req->in.numargs = 1;
816 req->in.args[0].size = sizeof(inarg);
817 req->in.args[0].value = &inarg;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700818 req->out.numargs = 1;
Miklos Szeredi0e9663e2007-10-18 03:07:05 -0700819 if (fc->minor < 9)
820 req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE;
821 else
822 req->out.args[0].size = sizeof(outarg);
Miklos Szeredic79e3222007-10-18 03:06:59 -0700823 req->out.args[0].value = &outarg;
Tejun Heob93f8582008-11-26 12:03:55 +0100824 fuse_request_send(fc, req);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700825 err = req->out.h.error;
826 fuse_put_request(fc, req);
827 if (!err) {
Miklos Szeredic79e3222007-10-18 03:06:59 -0700828 if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) {
Miklos Szeredie5e55582005-09-09 13:10:28 -0700829 make_bad_inode(inode);
830 err = -EIO;
831 } else {
Miklos Szeredic79e3222007-10-18 03:06:59 -0700832 fuse_change_attributes(inode, &outarg.attr,
833 attr_timeout(&outarg),
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700834 attr_version);
835 if (stat)
Miklos Szeredic79e3222007-10-18 03:06:59 -0700836 fuse_fillattr(inode, &outarg.attr, stat);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700837 }
838 }
839 return err;
840}
841
Miklos Szeredibcb4be82007-11-28 16:21:59 -0800842int fuse_update_attributes(struct inode *inode, struct kstat *stat,
843 struct file *file, bool *refreshed)
844{
845 struct fuse_inode *fi = get_fuse_inode(inode);
846 int err;
847 bool r;
848
849 if (fi->i_time < get_jiffies_64()) {
850 r = true;
851 err = fuse_do_getattr(inode, stat, file);
852 } else {
853 r = false;
854 err = 0;
855 if (stat) {
856 generic_fillattr(inode, stat);
857 stat->mode = fi->orig_i_mode;
858 }
859 }
860
861 if (refreshed != NULL)
862 *refreshed = r;
863
864 return err;
865}
866
John Muir3b463ae2009-05-31 11:13:57 -0400867int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid,
868 struct qstr *name)
869{
870 int err = -ENOTDIR;
871 struct inode *parent;
872 struct dentry *dir;
873 struct dentry *entry;
874
875 parent = ilookup5(sb, parent_nodeid, fuse_inode_eq, &parent_nodeid);
876 if (!parent)
877 return -ENOENT;
878
879 mutex_lock(&parent->i_mutex);
880 if (!S_ISDIR(parent->i_mode))
881 goto unlock;
882
883 err = -ENOENT;
884 dir = d_find_alias(parent);
885 if (!dir)
886 goto unlock;
887
888 entry = d_lookup(dir, name);
889 dput(dir);
890 if (!entry)
891 goto unlock;
892
893 fuse_invalidate_attr(parent);
894 fuse_invalidate_entry(entry);
895 dput(entry);
896 err = 0;
897
898 unlock:
899 mutex_unlock(&parent->i_mutex);
900 iput(parent);
901 return err;
902}
903
Miklos Szeredi87729a52005-09-09 13:10:34 -0700904/*
905 * Calling into a user-controlled filesystem gives the filesystem
906 * daemon ptrace-like capabilities over the requester process. This
907 * means, that the filesystem daemon is able to record the exact
908 * filesystem operations performed, and can also control the behavior
909 * of the requester process in otherwise impossible ways. For example
910 * it can delay the operation for arbitrary length of time allowing
911 * DoS against the requester.
912 *
913 * For this reason only those processes can call into the filesystem,
914 * for which the owner of the mount has ptrace privilege. This
915 * excludes processes started by other users, suid or sgid processes.
916 */
Miklos Szeredie57ac682007-10-18 03:06:58 -0700917int fuse_allow_task(struct fuse_conn *fc, struct task_struct *task)
Miklos Szeredi87729a52005-09-09 13:10:34 -0700918{
David Howellsc69e8d92008-11-14 10:39:19 +1100919 const struct cred *cred;
920 int ret;
921
Miklos Szeredi87729a52005-09-09 13:10:34 -0700922 if (fc->flags & FUSE_ALLOW_OTHER)
923 return 1;
924
David Howellsc69e8d92008-11-14 10:39:19 +1100925 rcu_read_lock();
926 ret = 0;
927 cred = __task_cred(task);
928 if (cred->euid == fc->user_id &&
929 cred->suid == fc->user_id &&
930 cred->uid == fc->user_id &&
931 cred->egid == fc->group_id &&
932 cred->sgid == fc->group_id &&
933 cred->gid == fc->group_id)
934 ret = 1;
935 rcu_read_unlock();
Miklos Szeredi87729a52005-09-09 13:10:34 -0700936
David Howellsc69e8d92008-11-14 10:39:19 +1100937 return ret;
Miklos Szeredi87729a52005-09-09 13:10:34 -0700938}
939
Miklos Szeredi31d40d72005-11-07 00:59:50 -0800940static int fuse_access(struct inode *inode, int mask)
941{
942 struct fuse_conn *fc = get_fuse_conn(inode);
943 struct fuse_req *req;
944 struct fuse_access_in inarg;
945 int err;
946
947 if (fc->no_access)
948 return 0;
949
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700950 req = fuse_get_req(fc);
951 if (IS_ERR(req))
952 return PTR_ERR(req);
Miklos Szeredi31d40d72005-11-07 00:59:50 -0800953
954 memset(&inarg, 0, sizeof(inarg));
Al Viroe6305c42008-07-15 21:03:57 -0400955 inarg.mask = mask & (MAY_READ | MAY_WRITE | MAY_EXEC);
Miklos Szeredi31d40d72005-11-07 00:59:50 -0800956 req->in.h.opcode = FUSE_ACCESS;
957 req->in.h.nodeid = get_node_id(inode);
Miklos Szeredi31d40d72005-11-07 00:59:50 -0800958 req->in.numargs = 1;
959 req->in.args[0].size = sizeof(inarg);
960 req->in.args[0].value = &inarg;
Tejun Heob93f8582008-11-26 12:03:55 +0100961 fuse_request_send(fc, req);
Miklos Szeredi31d40d72005-11-07 00:59:50 -0800962 err = req->out.h.error;
963 fuse_put_request(fc, req);
964 if (err == -ENOSYS) {
965 fc->no_access = 1;
966 err = 0;
967 }
968 return err;
969}
970
Miklos Szeredi6f9f1182006-01-06 00:19:39 -0800971/*
972 * Check permission. The two basic access models of FUSE are:
973 *
974 * 1) Local access checking ('default_permissions' mount option) based
975 * on file mode. This is the plain old disk filesystem permission
976 * modell.
977 *
978 * 2) "Remote" access checking, where server is responsible for
979 * checking permission in each inode operation. An exception to this
980 * is if ->permission() was invoked from sys_access() in which case an
981 * access request is sent. Execute permission is still checked
982 * locally based on file mode.
983 */
Al Viroe6305c42008-07-15 21:03:57 -0400984static int fuse_permission(struct inode *inode, int mask)
Miklos Szeredie5e55582005-09-09 13:10:28 -0700985{
986 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredi244f6382007-10-16 23:31:02 -0700987 bool refreshed = false;
988 int err = 0;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700989
Miklos Szeredi87729a52005-09-09 13:10:34 -0700990 if (!fuse_allow_task(fc, current))
Miklos Szeredie5e55582005-09-09 13:10:28 -0700991 return -EACCES;
Miklos Szeredi244f6382007-10-16 23:31:02 -0700992
993 /*
Miklos Szeredie8e96152007-10-16 23:31:06 -0700994 * If attributes are needed, refresh them before proceeding
Miklos Szeredi244f6382007-10-16 23:31:02 -0700995 */
Miklos Szeredie8e96152007-10-16 23:31:06 -0700996 if ((fc->flags & FUSE_DEFAULT_PERMISSIONS) ||
997 ((mask & MAY_EXEC) && S_ISREG(inode->i_mode))) {
Miklos Szeredibcb4be82007-11-28 16:21:59 -0800998 err = fuse_update_attributes(inode, NULL, NULL, &refreshed);
999 if (err)
1000 return err;
Miklos Szeredi244f6382007-10-16 23:31:02 -07001001 }
1002
1003 if (fc->flags & FUSE_DEFAULT_PERMISSIONS) {
Miklos Szeredi1a823ac2008-02-23 15:23:27 -08001004 err = generic_permission(inode, mask, NULL);
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -07001005
1006 /* If permission is denied, try to refresh file
1007 attributes. This is also needed, because the root
1008 node will at first have no permissions */
Miklos Szeredi244f6382007-10-16 23:31:02 -07001009 if (err == -EACCES && !refreshed) {
Miklos Szeredic79e3222007-10-18 03:06:59 -07001010 err = fuse_do_getattr(inode, NULL, NULL);
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -07001011 if (!err)
1012 err = generic_permission(inode, mask, NULL);
1013 }
1014
Miklos Szeredi6f9f1182006-01-06 00:19:39 -08001015 /* Note: the opposite of the above test does not
1016 exist. So if permissions are revoked this won't be
1017 noticed immediately, only after the attribute
1018 timeout has expired */
Eric Paris9cfcac82010-07-23 11:43:51 -04001019 } else if (mask & (MAY_ACCESS | MAY_CHDIR)) {
Miklos Szeredie8e96152007-10-16 23:31:06 -07001020 err = fuse_access(inode, mask);
1021 } else if ((mask & MAY_EXEC) && S_ISREG(inode->i_mode)) {
1022 if (!(inode->i_mode & S_IXUGO)) {
1023 if (refreshed)
1024 return -EACCES;
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -07001025
Miklos Szeredic79e3222007-10-18 03:06:59 -07001026 err = fuse_do_getattr(inode, NULL, NULL);
Miklos Szeredie8e96152007-10-16 23:31:06 -07001027 if (!err && !(inode->i_mode & S_IXUGO))
1028 return -EACCES;
1029 }
Miklos Szeredie5e55582005-09-09 13:10:28 -07001030 }
Miklos Szeredi244f6382007-10-16 23:31:02 -07001031 return err;
Miklos Szeredie5e55582005-09-09 13:10:28 -07001032}
1033
1034static int parse_dirfile(char *buf, size_t nbytes, struct file *file,
1035 void *dstbuf, filldir_t filldir)
1036{
1037 while (nbytes >= FUSE_NAME_OFFSET) {
1038 struct fuse_dirent *dirent = (struct fuse_dirent *) buf;
1039 size_t reclen = FUSE_DIRENT_SIZE(dirent);
1040 int over;
1041 if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX)
1042 return -EIO;
1043 if (reclen > nbytes)
1044 break;
1045
1046 over = filldir(dstbuf, dirent->name, dirent->namelen,
1047 file->f_pos, dirent->ino, dirent->type);
1048 if (over)
1049 break;
1050
1051 buf += reclen;
1052 nbytes -= reclen;
1053 file->f_pos = dirent->off;
1054 }
1055
1056 return 0;
1057}
1058
Miklos Szeredie5e55582005-09-09 13:10:28 -07001059static int fuse_readdir(struct file *file, void *dstbuf, filldir_t filldir)
1060{
Miklos Szeredi04730fe2005-09-09 13:10:36 -07001061 int err;
1062 size_t nbytes;
1063 struct page *page;
Josef Sipek7706a9d2006-12-08 02:37:02 -08001064 struct inode *inode = file->f_path.dentry->d_inode;
Miklos Szeredi04730fe2005-09-09 13:10:36 -07001065 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredi248d86e2006-01-06 00:19:39 -08001066 struct fuse_req *req;
1067
1068 if (is_bad_inode(inode))
1069 return -EIO;
1070
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001071 req = fuse_get_req(fc);
1072 if (IS_ERR(req))
1073 return PTR_ERR(req);
Miklos Szeredie5e55582005-09-09 13:10:28 -07001074
Miklos Szeredi04730fe2005-09-09 13:10:36 -07001075 page = alloc_page(GFP_KERNEL);
1076 if (!page) {
1077 fuse_put_request(fc, req);
Miklos Szeredie5e55582005-09-09 13:10:28 -07001078 return -ENOMEM;
Miklos Szeredi04730fe2005-09-09 13:10:36 -07001079 }
Miklos Szeredif4975c62009-04-02 14:25:34 +02001080 req->out.argpages = 1;
Miklos Szeredi04730fe2005-09-09 13:10:36 -07001081 req->num_pages = 1;
1082 req->pages[0] = page;
Miklos Szeredi2106cb12009-04-28 16:56:37 +02001083 fuse_read_fill(req, file, file->f_pos, PAGE_SIZE, FUSE_READDIR);
Tejun Heob93f8582008-11-26 12:03:55 +01001084 fuse_request_send(fc, req);
Miklos Szeredi361b1eb52006-01-16 22:14:45 -08001085 nbytes = req->out.args[0].size;
Miklos Szeredi04730fe2005-09-09 13:10:36 -07001086 err = req->out.h.error;
1087 fuse_put_request(fc, req);
1088 if (!err)
1089 err = parse_dirfile(page_address(page), nbytes, file, dstbuf,
1090 filldir);
Miklos Szeredie5e55582005-09-09 13:10:28 -07001091
Miklos Szeredi04730fe2005-09-09 13:10:36 -07001092 __free_page(page);
Miklos Szeredib36c31b2005-09-09 13:10:38 -07001093 fuse_invalidate_attr(inode); /* atime changed */
Miklos Szeredi04730fe2005-09-09 13:10:36 -07001094 return err;
Miklos Szeredie5e55582005-09-09 13:10:28 -07001095}
1096
1097static char *read_link(struct dentry *dentry)
1098{
1099 struct inode *inode = dentry->d_inode;
1100 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001101 struct fuse_req *req = fuse_get_req(fc);
Miklos Szeredie5e55582005-09-09 13:10:28 -07001102 char *link;
1103
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001104 if (IS_ERR(req))
David Howellse231c2e2008-02-07 00:15:26 -08001105 return ERR_CAST(req);
Miklos Szeredie5e55582005-09-09 13:10:28 -07001106
1107 link = (char *) __get_free_page(GFP_KERNEL);
1108 if (!link) {
1109 link = ERR_PTR(-ENOMEM);
1110 goto out;
1111 }
1112 req->in.h.opcode = FUSE_READLINK;
1113 req->in.h.nodeid = get_node_id(inode);
Miklos Szeredie5e55582005-09-09 13:10:28 -07001114 req->out.argvar = 1;
1115 req->out.numargs = 1;
1116 req->out.args[0].size = PAGE_SIZE - 1;
1117 req->out.args[0].value = link;
Tejun Heob93f8582008-11-26 12:03:55 +01001118 fuse_request_send(fc, req);
Miklos Szeredie5e55582005-09-09 13:10:28 -07001119 if (req->out.h.error) {
1120 free_page((unsigned long) link);
1121 link = ERR_PTR(req->out.h.error);
1122 } else
1123 link[req->out.args[0].size] = '\0';
1124 out:
1125 fuse_put_request(fc, req);
Miklos Szeredib36c31b2005-09-09 13:10:38 -07001126 fuse_invalidate_attr(inode); /* atime changed */
Miklos Szeredie5e55582005-09-09 13:10:28 -07001127 return link;
1128}
1129
1130static void free_link(char *link)
1131{
1132 if (!IS_ERR(link))
1133 free_page((unsigned long) link);
1134}
1135
1136static void *fuse_follow_link(struct dentry *dentry, struct nameidata *nd)
1137{
1138 nd_set_link(nd, read_link(dentry));
1139 return NULL;
1140}
1141
1142static void fuse_put_link(struct dentry *dentry, struct nameidata *nd, void *c)
1143{
1144 free_link(nd_get_link(nd));
1145}
1146
1147static int fuse_dir_open(struct inode *inode, struct file *file)
1148{
Miklos Szeredi91fe96b2009-04-28 16:56:37 +02001149 return fuse_open_common(inode, file, true);
Miklos Szeredie5e55582005-09-09 13:10:28 -07001150}
1151
1152static int fuse_dir_release(struct inode *inode, struct file *file)
1153{
Miklos Szeredi8b0797a2009-04-28 16:56:39 +02001154 fuse_release_common(file, FUSE_RELEASEDIR);
1155
1156 return 0;
Miklos Szeredie5e55582005-09-09 13:10:28 -07001157}
1158
Christoph Hellwig7ea80852010-05-26 17:53:25 +02001159static int fuse_dir_fsync(struct file *file, int datasync)
Miklos Szeredi82547982005-09-09 13:10:38 -07001160{
Christoph Hellwig7ea80852010-05-26 17:53:25 +02001161 return fuse_fsync_common(file, datasync, 1);
Miklos Szeredi82547982005-09-09 13:10:38 -07001162}
1163
Miklos Szeredi17637cb2007-10-18 03:07:01 -07001164static bool update_mtime(unsigned ivalid)
1165{
1166 /* Always update if mtime is explicitly set */
1167 if (ivalid & ATTR_MTIME_SET)
1168 return true;
1169
1170 /* If it's an open(O_TRUNC) or an ftruncate(), don't update */
1171 if ((ivalid & ATTR_SIZE) && (ivalid & (ATTR_OPEN | ATTR_FILE)))
1172 return false;
1173
1174 /* In all other cases update */
1175 return true;
1176}
1177
Miklos Szeredibefc6492005-11-07 00:59:52 -08001178static void iattr_to_fattr(struct iattr *iattr, struct fuse_setattr_in *arg)
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001179{
1180 unsigned ivalid = iattr->ia_valid;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001181
1182 if (ivalid & ATTR_MODE)
Miklos Szeredibefc6492005-11-07 00:59:52 -08001183 arg->valid |= FATTR_MODE, arg->mode = iattr->ia_mode;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001184 if (ivalid & ATTR_UID)
Miklos Szeredibefc6492005-11-07 00:59:52 -08001185 arg->valid |= FATTR_UID, arg->uid = iattr->ia_uid;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001186 if (ivalid & ATTR_GID)
Miklos Szeredibefc6492005-11-07 00:59:52 -08001187 arg->valid |= FATTR_GID, arg->gid = iattr->ia_gid;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001188 if (ivalid & ATTR_SIZE)
Miklos Szeredibefc6492005-11-07 00:59:52 -08001189 arg->valid |= FATTR_SIZE, arg->size = iattr->ia_size;
Miklos Szeredi17637cb2007-10-18 03:07:01 -07001190 if (ivalid & ATTR_ATIME) {
1191 arg->valid |= FATTR_ATIME;
Miklos Szeredibefc6492005-11-07 00:59:52 -08001192 arg->atime = iattr->ia_atime.tv_sec;
Miklos Szeredi17637cb2007-10-18 03:07:01 -07001193 arg->atimensec = iattr->ia_atime.tv_nsec;
1194 if (!(ivalid & ATTR_ATIME_SET))
1195 arg->valid |= FATTR_ATIME_NOW;
1196 }
1197 if ((ivalid & ATTR_MTIME) && update_mtime(ivalid)) {
1198 arg->valid |= FATTR_MTIME;
Miklos Szeredibefc6492005-11-07 00:59:52 -08001199 arg->mtime = iattr->ia_mtime.tv_sec;
Miklos Szeredi17637cb2007-10-18 03:07:01 -07001200 arg->mtimensec = iattr->ia_mtime.tv_nsec;
1201 if (!(ivalid & ATTR_MTIME_SET))
1202 arg->valid |= FATTR_MTIME_NOW;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001203 }
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001204}
1205
Miklos Szeredi6f9f1182006-01-06 00:19:39 -08001206/*
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001207 * Prevent concurrent writepages on inode
1208 *
1209 * This is done by adding a negative bias to the inode write counter
1210 * and waiting for all pending writes to finish.
1211 */
1212void fuse_set_nowrite(struct inode *inode)
1213{
1214 struct fuse_conn *fc = get_fuse_conn(inode);
1215 struct fuse_inode *fi = get_fuse_inode(inode);
1216
1217 BUG_ON(!mutex_is_locked(&inode->i_mutex));
1218
1219 spin_lock(&fc->lock);
1220 BUG_ON(fi->writectr < 0);
1221 fi->writectr += FUSE_NOWRITE;
1222 spin_unlock(&fc->lock);
1223 wait_event(fi->page_waitq, fi->writectr == FUSE_NOWRITE);
1224}
1225
1226/*
1227 * Allow writepages on inode
1228 *
1229 * Remove the bias from the writecounter and send any queued
1230 * writepages.
1231 */
1232static void __fuse_release_nowrite(struct inode *inode)
1233{
1234 struct fuse_inode *fi = get_fuse_inode(inode);
1235
1236 BUG_ON(fi->writectr != FUSE_NOWRITE);
1237 fi->writectr = 0;
1238 fuse_flush_writepages(inode);
1239}
1240
1241void fuse_release_nowrite(struct inode *inode)
1242{
1243 struct fuse_conn *fc = get_fuse_conn(inode);
1244
1245 spin_lock(&fc->lock);
1246 __fuse_release_nowrite(inode);
1247 spin_unlock(&fc->lock);
1248}
1249
1250/*
Miklos Szeredi6f9f1182006-01-06 00:19:39 -08001251 * Set attributes, and at the same time refresh them.
1252 *
1253 * Truncation is slightly complicated, because the 'truncate' request
1254 * may fail, in which case we don't want to touch the mapping.
Miklos Szeredi9ffbb912006-10-17 00:10:06 -07001255 * vmtruncate() doesn't allow for this case, so do the rlimit checking
1256 * and the actual truncation by hand.
Miklos Szeredi6f9f1182006-01-06 00:19:39 -08001257 */
Miklos Szeredi49d49142007-10-18 03:07:00 -07001258static int fuse_do_setattr(struct dentry *entry, struct iattr *attr,
1259 struct file *file)
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001260{
1261 struct inode *inode = entry->d_inode;
1262 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001263 struct fuse_req *req;
1264 struct fuse_setattr_in inarg;
1265 struct fuse_attr_out outarg;
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001266 bool is_truncate = false;
1267 loff_t oldsize;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001268 int err;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001269
Miklos Szeredie57ac682007-10-18 03:06:58 -07001270 if (!fuse_allow_task(fc, current))
1271 return -EACCES;
1272
Christoph Hellwigdb78b872010-06-04 11:30:03 +02001273 if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS))
1274 attr->ia_valid |= ATTR_FORCE;
1275
1276 err = inode_change_ok(inode, attr);
1277 if (err)
1278 return err;
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -07001279
Miklos Szeredi6ff958e2007-10-18 03:07:02 -07001280 if ((attr->ia_valid & ATTR_OPEN) && fc->atomic_o_trunc)
1281 return 0;
1282
Christoph Hellwig2c27c652010-06-04 11:30:04 +02001283 if (attr->ia_valid & ATTR_SIZE)
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001284 is_truncate = true;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001285
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001286 req = fuse_get_req(fc);
1287 if (IS_ERR(req))
1288 return PTR_ERR(req);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001289
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001290 if (is_truncate)
1291 fuse_set_nowrite(inode);
1292
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001293 memset(&inarg, 0, sizeof(inarg));
Miklos Szeredi0e9663e2007-10-18 03:07:05 -07001294 memset(&outarg, 0, sizeof(outarg));
Miklos Szeredibefc6492005-11-07 00:59:52 -08001295 iattr_to_fattr(attr, &inarg);
Miklos Szeredi49d49142007-10-18 03:07:00 -07001296 if (file) {
1297 struct fuse_file *ff = file->private_data;
1298 inarg.valid |= FATTR_FH;
1299 inarg.fh = ff->fh;
1300 }
Miklos Szeredif3332112007-10-18 03:07:04 -07001301 if (attr->ia_valid & ATTR_SIZE) {
1302 /* For mandatory locking in truncate */
1303 inarg.valid |= FATTR_LOCKOWNER;
1304 inarg.lock_owner = fuse_lock_owner_id(fc, current->files);
1305 }
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001306 req->in.h.opcode = FUSE_SETATTR;
1307 req->in.h.nodeid = get_node_id(inode);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001308 req->in.numargs = 1;
1309 req->in.args[0].size = sizeof(inarg);
1310 req->in.args[0].value = &inarg;
1311 req->out.numargs = 1;
Miklos Szeredi0e9663e2007-10-18 03:07:05 -07001312 if (fc->minor < 9)
1313 req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE;
1314 else
1315 req->out.args[0].size = sizeof(outarg);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001316 req->out.args[0].value = &outarg;
Tejun Heob93f8582008-11-26 12:03:55 +01001317 fuse_request_send(fc, req);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001318 err = req->out.h.error;
1319 fuse_put_request(fc, req);
Miklos Szeredie00d2c22007-10-16 23:31:01 -07001320 if (err) {
1321 if (err == -EINTR)
1322 fuse_invalidate_attr(inode);
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001323 goto error;
Miklos Szeredie00d2c22007-10-16 23:31:01 -07001324 }
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001325
Miklos Szeredie00d2c22007-10-16 23:31:01 -07001326 if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) {
1327 make_bad_inode(inode);
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001328 err = -EIO;
1329 goto error;
Miklos Szeredie00d2c22007-10-16 23:31:01 -07001330 }
1331
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001332 spin_lock(&fc->lock);
1333 fuse_change_attributes_common(inode, &outarg.attr,
1334 attr_timeout(&outarg));
1335 oldsize = inode->i_size;
1336 i_size_write(inode, outarg.attr.size);
1337
1338 if (is_truncate) {
1339 /* NOTE: this may release/reacquire fc->lock */
1340 __fuse_release_nowrite(inode);
1341 }
1342 spin_unlock(&fc->lock);
1343
1344 /*
1345 * Only call invalidate_inode_pages2() after removing
1346 * FUSE_NOWRITE, otherwise fuse_launder_page() would deadlock.
1347 */
1348 if (S_ISREG(inode->i_mode) && oldsize != outarg.attr.size) {
npiggin@suse.dec08d3b02009-08-21 02:35:06 +10001349 truncate_pagecache(inode, oldsize, outarg.attr.size);
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001350 invalidate_inode_pages2(inode->i_mapping);
1351 }
1352
Miklos Szeredie00d2c22007-10-16 23:31:01 -07001353 return 0;
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001354
1355error:
1356 if (is_truncate)
1357 fuse_release_nowrite(inode);
1358
1359 return err;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001360}
1361
Miklos Szeredi49d49142007-10-18 03:07:00 -07001362static int fuse_setattr(struct dentry *entry, struct iattr *attr)
1363{
1364 if (attr->ia_valid & ATTR_FILE)
1365 return fuse_do_setattr(entry, attr, attr->ia_file);
1366 else
1367 return fuse_do_setattr(entry, attr, NULL);
1368}
1369
Miklos Szeredie5e55582005-09-09 13:10:28 -07001370static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry,
1371 struct kstat *stat)
1372{
1373 struct inode *inode = entry->d_inode;
Miklos Szeredi244f6382007-10-16 23:31:02 -07001374 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredi244f6382007-10-16 23:31:02 -07001375
1376 if (!fuse_allow_task(fc, current))
1377 return -EACCES;
1378
Miklos Szeredibcb4be82007-11-28 16:21:59 -08001379 return fuse_update_attributes(inode, stat, NULL, NULL);
Miklos Szeredie5e55582005-09-09 13:10:28 -07001380}
1381
Miklos Szeredi92a87802005-09-09 13:10:31 -07001382static int fuse_setxattr(struct dentry *entry, const char *name,
1383 const void *value, size_t size, int flags)
1384{
1385 struct inode *inode = entry->d_inode;
1386 struct fuse_conn *fc = get_fuse_conn(inode);
1387 struct fuse_req *req;
1388 struct fuse_setxattr_in inarg;
1389 int err;
1390
Miklos Szeredi92a87802005-09-09 13:10:31 -07001391 if (fc->no_setxattr)
1392 return -EOPNOTSUPP;
1393
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001394 req = fuse_get_req(fc);
1395 if (IS_ERR(req))
1396 return PTR_ERR(req);
Miklos Szeredi92a87802005-09-09 13:10:31 -07001397
1398 memset(&inarg, 0, sizeof(inarg));
1399 inarg.size = size;
1400 inarg.flags = flags;
1401 req->in.h.opcode = FUSE_SETXATTR;
1402 req->in.h.nodeid = get_node_id(inode);
Miklos Szeredi92a87802005-09-09 13:10:31 -07001403 req->in.numargs = 3;
1404 req->in.args[0].size = sizeof(inarg);
1405 req->in.args[0].value = &inarg;
1406 req->in.args[1].size = strlen(name) + 1;
1407 req->in.args[1].value = name;
1408 req->in.args[2].size = size;
1409 req->in.args[2].value = value;
Tejun Heob93f8582008-11-26 12:03:55 +01001410 fuse_request_send(fc, req);
Miklos Szeredi92a87802005-09-09 13:10:31 -07001411 err = req->out.h.error;
1412 fuse_put_request(fc, req);
1413 if (err == -ENOSYS) {
1414 fc->no_setxattr = 1;
1415 err = -EOPNOTSUPP;
1416 }
1417 return err;
1418}
1419
1420static ssize_t fuse_getxattr(struct dentry *entry, const char *name,
1421 void *value, size_t size)
1422{
1423 struct inode *inode = entry->d_inode;
1424 struct fuse_conn *fc = get_fuse_conn(inode);
1425 struct fuse_req *req;
1426 struct fuse_getxattr_in inarg;
1427 struct fuse_getxattr_out outarg;
1428 ssize_t ret;
1429
1430 if (fc->no_getxattr)
1431 return -EOPNOTSUPP;
1432
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001433 req = fuse_get_req(fc);
1434 if (IS_ERR(req))
1435 return PTR_ERR(req);
Miklos Szeredi92a87802005-09-09 13:10:31 -07001436
1437 memset(&inarg, 0, sizeof(inarg));
1438 inarg.size = size;
1439 req->in.h.opcode = FUSE_GETXATTR;
1440 req->in.h.nodeid = get_node_id(inode);
Miklos Szeredi92a87802005-09-09 13:10:31 -07001441 req->in.numargs = 2;
1442 req->in.args[0].size = sizeof(inarg);
1443 req->in.args[0].value = &inarg;
1444 req->in.args[1].size = strlen(name) + 1;
1445 req->in.args[1].value = name;
1446 /* This is really two different operations rolled into one */
1447 req->out.numargs = 1;
1448 if (size) {
1449 req->out.argvar = 1;
1450 req->out.args[0].size = size;
1451 req->out.args[0].value = value;
1452 } else {
1453 req->out.args[0].size = sizeof(outarg);
1454 req->out.args[0].value = &outarg;
1455 }
Tejun Heob93f8582008-11-26 12:03:55 +01001456 fuse_request_send(fc, req);
Miklos Szeredi92a87802005-09-09 13:10:31 -07001457 ret = req->out.h.error;
1458 if (!ret)
1459 ret = size ? req->out.args[0].size : outarg.size;
1460 else {
1461 if (ret == -ENOSYS) {
1462 fc->no_getxattr = 1;
1463 ret = -EOPNOTSUPP;
1464 }
1465 }
1466 fuse_put_request(fc, req);
1467 return ret;
1468}
1469
1470static ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size)
1471{
1472 struct inode *inode = entry->d_inode;
1473 struct fuse_conn *fc = get_fuse_conn(inode);
1474 struct fuse_req *req;
1475 struct fuse_getxattr_in inarg;
1476 struct fuse_getxattr_out outarg;
1477 ssize_t ret;
1478
Miklos Szeredie57ac682007-10-18 03:06:58 -07001479 if (!fuse_allow_task(fc, current))
1480 return -EACCES;
1481
Miklos Szeredi92a87802005-09-09 13:10:31 -07001482 if (fc->no_listxattr)
1483 return -EOPNOTSUPP;
1484
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001485 req = fuse_get_req(fc);
1486 if (IS_ERR(req))
1487 return PTR_ERR(req);
Miklos Szeredi92a87802005-09-09 13:10:31 -07001488
1489 memset(&inarg, 0, sizeof(inarg));
1490 inarg.size = size;
1491 req->in.h.opcode = FUSE_LISTXATTR;
1492 req->in.h.nodeid = get_node_id(inode);
Miklos Szeredi92a87802005-09-09 13:10:31 -07001493 req->in.numargs = 1;
1494 req->in.args[0].size = sizeof(inarg);
1495 req->in.args[0].value = &inarg;
1496 /* This is really two different operations rolled into one */
1497 req->out.numargs = 1;
1498 if (size) {
1499 req->out.argvar = 1;
1500 req->out.args[0].size = size;
1501 req->out.args[0].value = list;
1502 } else {
1503 req->out.args[0].size = sizeof(outarg);
1504 req->out.args[0].value = &outarg;
1505 }
Tejun Heob93f8582008-11-26 12:03:55 +01001506 fuse_request_send(fc, req);
Miklos Szeredi92a87802005-09-09 13:10:31 -07001507 ret = req->out.h.error;
1508 if (!ret)
1509 ret = size ? req->out.args[0].size : outarg.size;
1510 else {
1511 if (ret == -ENOSYS) {
1512 fc->no_listxattr = 1;
1513 ret = -EOPNOTSUPP;
1514 }
1515 }
1516 fuse_put_request(fc, req);
1517 return ret;
1518}
1519
1520static int fuse_removexattr(struct dentry *entry, const char *name)
1521{
1522 struct inode *inode = entry->d_inode;
1523 struct fuse_conn *fc = get_fuse_conn(inode);
1524 struct fuse_req *req;
1525 int err;
1526
1527 if (fc->no_removexattr)
1528 return -EOPNOTSUPP;
1529
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001530 req = fuse_get_req(fc);
1531 if (IS_ERR(req))
1532 return PTR_ERR(req);
Miklos Szeredi92a87802005-09-09 13:10:31 -07001533
1534 req->in.h.opcode = FUSE_REMOVEXATTR;
1535 req->in.h.nodeid = get_node_id(inode);
Miklos Szeredi92a87802005-09-09 13:10:31 -07001536 req->in.numargs = 1;
1537 req->in.args[0].size = strlen(name) + 1;
1538 req->in.args[0].value = name;
Tejun Heob93f8582008-11-26 12:03:55 +01001539 fuse_request_send(fc, req);
Miklos Szeredi92a87802005-09-09 13:10:31 -07001540 err = req->out.h.error;
1541 fuse_put_request(fc, req);
1542 if (err == -ENOSYS) {
1543 fc->no_removexattr = 1;
1544 err = -EOPNOTSUPP;
1545 }
1546 return err;
1547}
1548
Arjan van de Ven754661f2007-02-12 00:55:38 -08001549static const struct inode_operations fuse_dir_inode_operations = {
Miklos Szeredie5e55582005-09-09 13:10:28 -07001550 .lookup = fuse_lookup,
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001551 .mkdir = fuse_mkdir,
1552 .symlink = fuse_symlink,
1553 .unlink = fuse_unlink,
1554 .rmdir = fuse_rmdir,
1555 .rename = fuse_rename,
1556 .link = fuse_link,
1557 .setattr = fuse_setattr,
1558 .create = fuse_create,
1559 .mknod = fuse_mknod,
Miklos Szeredie5e55582005-09-09 13:10:28 -07001560 .permission = fuse_permission,
1561 .getattr = fuse_getattr,
Miklos Szeredi92a87802005-09-09 13:10:31 -07001562 .setxattr = fuse_setxattr,
1563 .getxattr = fuse_getxattr,
1564 .listxattr = fuse_listxattr,
1565 .removexattr = fuse_removexattr,
Miklos Szeredie5e55582005-09-09 13:10:28 -07001566};
1567
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08001568static const struct file_operations fuse_dir_operations = {
Miklos Szeredib6aeade2005-09-09 13:10:30 -07001569 .llseek = generic_file_llseek,
Miklos Szeredie5e55582005-09-09 13:10:28 -07001570 .read = generic_read_dir,
1571 .readdir = fuse_readdir,
1572 .open = fuse_dir_open,
1573 .release = fuse_dir_release,
Miklos Szeredi82547982005-09-09 13:10:38 -07001574 .fsync = fuse_dir_fsync,
Miklos Szeredie5e55582005-09-09 13:10:28 -07001575};
1576
Arjan van de Ven754661f2007-02-12 00:55:38 -08001577static const struct inode_operations fuse_common_inode_operations = {
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001578 .setattr = fuse_setattr,
Miklos Szeredie5e55582005-09-09 13:10:28 -07001579 .permission = fuse_permission,
1580 .getattr = fuse_getattr,
Miklos Szeredi92a87802005-09-09 13:10:31 -07001581 .setxattr = fuse_setxattr,
1582 .getxattr = fuse_getxattr,
1583 .listxattr = fuse_listxattr,
1584 .removexattr = fuse_removexattr,
Miklos Szeredie5e55582005-09-09 13:10:28 -07001585};
1586
Arjan van de Ven754661f2007-02-12 00:55:38 -08001587static const struct inode_operations fuse_symlink_inode_operations = {
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001588 .setattr = fuse_setattr,
Miklos Szeredie5e55582005-09-09 13:10:28 -07001589 .follow_link = fuse_follow_link,
1590 .put_link = fuse_put_link,
1591 .readlink = generic_readlink,
1592 .getattr = fuse_getattr,
Miklos Szeredi92a87802005-09-09 13:10:31 -07001593 .setxattr = fuse_setxattr,
1594 .getxattr = fuse_getxattr,
1595 .listxattr = fuse_listxattr,
1596 .removexattr = fuse_removexattr,
Miklos Szeredie5e55582005-09-09 13:10:28 -07001597};
1598
1599void fuse_init_common(struct inode *inode)
1600{
1601 inode->i_op = &fuse_common_inode_operations;
1602}
1603
1604void fuse_init_dir(struct inode *inode)
1605{
1606 inode->i_op = &fuse_dir_inode_operations;
1607 inode->i_fop = &fuse_dir_operations;
1608}
1609
1610void fuse_init_symlink(struct inode *inode)
1611{
1612 inode->i_op = &fuse_symlink_inode_operations;
1613}