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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>
Miklos Szeredie5e55582005-09-09 13:10:28 -070013#include <linux/sched.h>
14#include <linux/namei.h>
Miklos Szeredi07e77dc2010-12-07 20:16:56 +010015#include <linux/slab.h>
Miklos Szeredie5e55582005-09-09 13:10:28 -070016
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{
Nick Piggin34286d62011-01-07 17:49:57 +1100159 struct inode *inode;
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -0800160
Nick Piggin34286d62011-01-07 17:49:57 +1100161 if (nd->flags & LOOKUP_RCU)
162 return -ECHILD;
163
164 inode = entry->d_inode;
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -0800165 if (inode && is_bad_inode(inode))
Miklos Szeredie5e55582005-09-09 13:10:28 -0700166 return 0;
Miklos Szeredi0a0898c2006-07-30 03:04:10 -0700167 else if (fuse_dentry_time(entry) < get_jiffies_64()) {
Miklos Szeredie5e55582005-09-09 13:10:28 -0700168 int err;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700169 struct fuse_entry_out outarg;
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -0800170 struct fuse_conn *fc;
171 struct fuse_req *req;
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100172 struct fuse_forget_link *forget;
Miklos Szeredie956edd2006-10-17 00:10:12 -0700173 struct dentry *parent;
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700174 u64 attr_version;
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -0800175
Miklos Szeredi50322fe2006-02-28 16:59:03 -0800176 /* For negative dentries, always do a fresh lookup */
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -0800177 if (!inode)
178 return 0;
179
180 fc = get_fuse_conn(inode);
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700181 req = fuse_get_req(fc);
182 if (IS_ERR(req))
Miklos Szeredie5e55582005-09-09 13:10:28 -0700183 return 0;
184
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100185 forget = fuse_alloc_forget();
186 if (!forget) {
Miklos Szeredi2d510132006-11-25 11:09:20 -0800187 fuse_put_request(fc, req);
188 return 0;
189 }
190
Miklos Szeredi7dca9fd2007-11-28 16:21:59 -0800191 attr_version = fuse_get_attr_version(fc);
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700192
Miklos Szeredie956edd2006-10-17 00:10:12 -0700193 parent = dget_parent(entry);
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700194 fuse_lookup_init(fc, req, get_node_id(parent->d_inode),
195 &entry->d_name, &outarg);
Tejun Heob93f8582008-11-26 12:03:55 +0100196 fuse_request_send(fc, req);
Miklos Szeredie956edd2006-10-17 00:10:12 -0700197 dput(parent);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700198 err = req->out.h.error;
Miklos Szeredi2d510132006-11-25 11:09:20 -0800199 fuse_put_request(fc, req);
Miklos Szeredi50322fe2006-02-28 16:59:03 -0800200 /* Zero nodeid is same as -ENOENT */
201 if (!err && !outarg.nodeid)
202 err = -ENOENT;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700203 if (!err) {
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -0800204 struct fuse_inode *fi = get_fuse_inode(inode);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700205 if (outarg.nodeid != get_node_id(inode)) {
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100206 fuse_queue_forget(fc, forget, outarg.nodeid, 1);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700207 return 0;
208 }
Miklos Szeredi8da5ff22006-10-17 00:10:08 -0700209 spin_lock(&fc->lock);
Miklos Szeredi1729a162008-11-26 12:03:54 +0100210 fi->nlookup++;
Miklos Szeredi8da5ff22006-10-17 00:10:08 -0700211 spin_unlock(&fc->lock);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700212 }
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100213 kfree(forget);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700214 if (err || (outarg.attr.mode ^ inode->i_mode) & S_IFMT)
Miklos Szeredie5e55582005-09-09 13:10:28 -0700215 return 0;
216
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700217 fuse_change_attributes(inode, &outarg.attr,
218 entry_attr_timeout(&outarg),
219 attr_version);
220 fuse_change_entry_timeout(entry, &outarg);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700221 }
222 return 1;
223}
224
Miklos Szeredi8bfc0162006-01-16 22:14:28 -0800225static int invalid_nodeid(u64 nodeid)
Miklos Szeredi2827d0b22005-11-28 13:44:16 -0800226{
227 return !nodeid || nodeid == FUSE_ROOT_ID;
228}
229
Al Viro42695902009-02-20 05:59:13 +0000230const struct dentry_operations fuse_dentry_operations = {
Miklos Szeredie5e55582005-09-09 13:10:28 -0700231 .d_revalidate = fuse_dentry_revalidate,
232};
233
Timo Savolaa5bfffac2007-04-08 16:04:00 -0700234int fuse_valid_type(int m)
Miklos Szeredi39ee0592006-01-06 00:19:43 -0800235{
236 return S_ISREG(m) || S_ISDIR(m) || S_ISLNK(m) || S_ISCHR(m) ||
237 S_ISBLK(m) || S_ISFIFO(m) || S_ISSOCK(m);
238}
239
Miklos Szeredid2a85162006-10-17 00:10:11 -0700240/*
241 * Add a directory inode to a dentry, ensuring that no other dentry
242 * refers to this inode. Called with fc->inst_mutex.
243 */
Miklos Szeredi0de62562008-07-25 01:48:59 -0700244static struct dentry *fuse_d_add_directory(struct dentry *entry,
245 struct inode *inode)
Miklos Szeredid2a85162006-10-17 00:10:11 -0700246{
247 struct dentry *alias = d_find_alias(inode);
Miklos Szeredi0de62562008-07-25 01:48:59 -0700248 if (alias && !(alias->d_flags & DCACHE_DISCONNECTED)) {
Miklos Szeredid2a85162006-10-17 00:10:11 -0700249 /* This tries to shrink the subtree below alias */
250 fuse_invalidate_entry(alias);
251 dput(alias);
252 if (!list_empty(&inode->i_dentry))
Miklos Szeredi0de62562008-07-25 01:48:59 -0700253 return ERR_PTR(-EBUSY);
254 } else {
255 dput(alias);
Miklos Szeredid2a85162006-10-17 00:10:11 -0700256 }
Miklos Szeredi0de62562008-07-25 01:48:59 -0700257 return d_splice_alias(inode, entry);
Miklos Szeredid2a85162006-10-17 00:10:11 -0700258}
259
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700260int fuse_lookup_name(struct super_block *sb, u64 nodeid, struct qstr *name,
261 struct fuse_entry_out *outarg, struct inode **inode)
262{
263 struct fuse_conn *fc = get_fuse_conn_super(sb);
264 struct fuse_req *req;
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100265 struct fuse_forget_link *forget;
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700266 u64 attr_version;
267 int err;
268
269 *inode = NULL;
270 err = -ENAMETOOLONG;
271 if (name->len > FUSE_NAME_MAX)
272 goto out;
273
274 req = fuse_get_req(fc);
275 err = PTR_ERR(req);
276 if (IS_ERR(req))
277 goto out;
278
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100279 forget = fuse_alloc_forget();
280 err = -ENOMEM;
281 if (!forget) {
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700282 fuse_put_request(fc, req);
283 goto out;
284 }
285
286 attr_version = fuse_get_attr_version(fc);
287
288 fuse_lookup_init(fc, req, nodeid, name, outarg);
Tejun Heob93f8582008-11-26 12:03:55 +0100289 fuse_request_send(fc, req);
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700290 err = req->out.h.error;
291 fuse_put_request(fc, req);
292 /* Zero nodeid is same as -ENOENT, but with valid timeout */
293 if (err || !outarg->nodeid)
294 goto out_put_forget;
295
296 err = -EIO;
297 if (!outarg->nodeid)
298 goto out_put_forget;
299 if (!fuse_valid_type(outarg->attr.mode))
300 goto out_put_forget;
301
302 *inode = fuse_iget(sb, outarg->nodeid, outarg->generation,
303 &outarg->attr, entry_attr_timeout(outarg),
304 attr_version);
305 err = -ENOMEM;
306 if (!*inode) {
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100307 fuse_queue_forget(fc, forget, outarg->nodeid, 1);
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700308 goto out;
309 }
310 err = 0;
311
312 out_put_forget:
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100313 kfree(forget);
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700314 out:
315 return err;
316}
317
Miklos Szeredi0aa7c692006-01-06 00:19:34 -0800318static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
319 struct nameidata *nd)
Miklos Szeredie5e55582005-09-09 13:10:28 -0700320{
321 int err;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700322 struct fuse_entry_out outarg;
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700323 struct inode *inode;
Miklos Szeredi0de62562008-07-25 01:48:59 -0700324 struct dentry *newent;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700325 struct fuse_conn *fc = get_fuse_conn(dir);
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700326 bool outarg_valid = true;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700327
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700328 err = fuse_lookup_name(dir->i_sb, get_node_id(dir), &entry->d_name,
329 &outarg, &inode);
330 if (err == -ENOENT) {
331 outarg_valid = false;
332 err = 0;
Miklos Szeredi2d510132006-11-25 11:09:20 -0800333 }
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700334 if (err)
335 goto out_err;
Miklos Szeredi2d510132006-11-25 11:09:20 -0800336
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700337 err = -EIO;
338 if (inode && get_node_id(inode) == FUSE_ROOT_ID)
339 goto out_iput;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700340
Miklos Szeredid2a85162006-10-17 00:10:11 -0700341 if (inode && S_ISDIR(inode->i_mode)) {
342 mutex_lock(&fc->inst_mutex);
Miklos Szeredi0de62562008-07-25 01:48:59 -0700343 newent = fuse_d_add_directory(entry, inode);
Miklos Szeredid2a85162006-10-17 00:10:11 -0700344 mutex_unlock(&fc->inst_mutex);
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700345 err = PTR_ERR(newent);
346 if (IS_ERR(newent))
347 goto out_iput;
348 } else {
Miklos Szeredi0de62562008-07-25 01:48:59 -0700349 newent = d_splice_alias(inode, entry);
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700350 }
Miklos Szeredid2a85162006-10-17 00:10:11 -0700351
Miklos Szeredi0de62562008-07-25 01:48:59 -0700352 entry = newent ? newent : entry;
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700353 if (outarg_valid)
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700354 fuse_change_entry_timeout(entry, &outarg);
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -0800355 else
356 fuse_invalidate_entry_cache(entry);
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700357
Miklos Szeredi0de62562008-07-25 01:48:59 -0700358 return newent;
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700359
360 out_iput:
361 iput(inode);
362 out_err:
363 return ERR_PTR(err);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700364}
365
Miklos Szeredi6f9f1182006-01-06 00:19:39 -0800366/*
367 * Atomic create+open operation
368 *
369 * If the filesystem doesn't support this, then fall back to separate
370 * 'mknod' + 'open' requests.
371 */
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800372static int fuse_create_open(struct inode *dir, struct dentry *entry, int mode,
373 struct nameidata *nd)
374{
375 int err;
376 struct inode *inode;
377 struct fuse_conn *fc = get_fuse_conn(dir);
378 struct fuse_req *req;
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100379 struct fuse_forget_link *forget;
Miklos Szeredie0a43dd2009-06-30 20:12:23 +0200380 struct fuse_create_in inarg;
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800381 struct fuse_open_out outopen;
382 struct fuse_entry_out outentry;
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800383 struct fuse_file *ff;
384 struct file *file;
385 int flags = nd->intent.open.flags - 1;
386
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800387 if (fc->no_create)
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700388 return -ENOSYS;
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800389
Csaba Henk1b732392009-11-27 19:30:14 +0530390 if (flags & O_DIRECT)
391 return -EINVAL;
392
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100393 forget = fuse_alloc_forget();
394 if (!forget)
395 return -ENOMEM;
Miklos Szeredi51eb01e2006-06-25 05:48:50 -0700396
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700397 req = fuse_get_req(fc);
Miklos Szeredi51eb01e2006-06-25 05:48:50 -0700398 err = PTR_ERR(req);
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700399 if (IS_ERR(req))
Miklos Szeredi51eb01e2006-06-25 05:48:50 -0700400 goto out_put_forget_req;
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800401
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700402 err = -ENOMEM;
Tejun Heoacf99432008-11-26 12:03:55 +0100403 ff = fuse_file_alloc(fc);
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800404 if (!ff)
405 goto out_put_request;
406
Miklos Szeredie0a43dd2009-06-30 20:12:23 +0200407 if (!fc->dont_mask)
408 mode &= ~current_umask();
409
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800410 flags &= ~O_NOCTTY;
411 memset(&inarg, 0, sizeof(inarg));
Miklos Szeredi0e9663e2007-10-18 03:07:05 -0700412 memset(&outentry, 0, sizeof(outentry));
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800413 inarg.flags = flags;
414 inarg.mode = mode;
Miklos Szeredie0a43dd2009-06-30 20:12:23 +0200415 inarg.umask = current_umask();
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800416 req->in.h.opcode = FUSE_CREATE;
417 req->in.h.nodeid = get_node_id(dir);
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800418 req->in.numargs = 2;
Miklos Szeredie0a43dd2009-06-30 20:12:23 +0200419 req->in.args[0].size = fc->minor < 12 ? sizeof(struct fuse_open_in) :
420 sizeof(inarg);
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800421 req->in.args[0].value = &inarg;
422 req->in.args[1].size = entry->d_name.len + 1;
423 req->in.args[1].value = entry->d_name.name;
424 req->out.numargs = 2;
Miklos Szeredi0e9663e2007-10-18 03:07:05 -0700425 if (fc->minor < 9)
426 req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE;
427 else
428 req->out.args[0].size = sizeof(outentry);
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800429 req->out.args[0].value = &outentry;
430 req->out.args[1].size = sizeof(outopen);
431 req->out.args[1].value = &outopen;
Tejun Heob93f8582008-11-26 12:03:55 +0100432 fuse_request_send(fc, req);
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800433 err = req->out.h.error;
434 if (err) {
435 if (err == -ENOSYS)
436 fc->no_create = 1;
437 goto out_free_ff;
438 }
439
440 err = -EIO;
Miklos Szeredi2827d0b22005-11-28 13:44:16 -0800441 if (!S_ISREG(outentry.attr.mode) || invalid_nodeid(outentry.nodeid))
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800442 goto out_free_ff;
443
Miklos Szeredi51eb01e2006-06-25 05:48:50 -0700444 fuse_put_request(fc, req);
Miklos Szeredic7b71432009-04-28 16:56:37 +0200445 ff->fh = outopen.fh;
446 ff->nodeid = outentry.nodeid;
447 ff->open_flags = outopen.open_flags;
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800448 inode = fuse_iget(dir->i_sb, outentry.nodeid, outentry.generation,
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700449 &outentry.attr, entry_attr_timeout(&outentry), 0);
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800450 if (!inode) {
451 flags &= ~(O_CREAT | O_EXCL | O_TRUNC);
Miklos Szeredi8b0797a2009-04-28 16:56:39 +0200452 fuse_sync_release(ff, flags);
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100453 fuse_queue_forget(fc, forget, outentry.nodeid, 1);
Miklos Szeredi51eb01e2006-06-25 05:48:50 -0700454 return -ENOMEM;
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800455 }
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100456 kfree(forget);
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800457 d_instantiate(entry, inode);
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700458 fuse_change_entry_timeout(entry, &outentry);
Miklos Szeredi0952b2a2008-02-06 01:38:38 -0800459 fuse_invalidate_attr(dir);
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800460 file = lookup_instantiate_filp(nd, entry, generic_file_open);
461 if (IS_ERR(file)) {
Miklos Szeredi8b0797a2009-04-28 16:56:39 +0200462 fuse_sync_release(ff, flags);
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800463 return PTR_ERR(file);
464 }
Miklos Szeredic7b71432009-04-28 16:56:37 +0200465 file->private_data = fuse_file_get(ff);
466 fuse_finish_open(inode, file);
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800467 return 0;
468
469 out_free_ff:
470 fuse_file_free(ff);
471 out_put_request:
472 fuse_put_request(fc, req);
Miklos Szeredi51eb01e2006-06-25 05:48:50 -0700473 out_put_forget_req:
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100474 kfree(forget);
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800475 return err;
476}
477
Miklos Szeredi6f9f1182006-01-06 00:19:39 -0800478/*
479 * Code shared between mknod, mkdir, symlink and link
480 */
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700481static int create_new_entry(struct fuse_conn *fc, struct fuse_req *req,
482 struct inode *dir, struct dentry *entry,
483 int mode)
484{
485 struct fuse_entry_out outarg;
486 struct inode *inode;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700487 int err;
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100488 struct fuse_forget_link *forget;
Miklos Szeredi2d510132006-11-25 11:09:20 -0800489
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100490 forget = fuse_alloc_forget();
491 if (!forget) {
Miklos Szeredi2d510132006-11-25 11:09:20 -0800492 fuse_put_request(fc, req);
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100493 return -ENOMEM;
Miklos Szeredi2d510132006-11-25 11:09:20 -0800494 }
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700495
Miklos Szeredi0e9663e2007-10-18 03:07:05 -0700496 memset(&outarg, 0, sizeof(outarg));
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700497 req->in.h.nodeid = get_node_id(dir);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700498 req->out.numargs = 1;
Miklos Szeredi0e9663e2007-10-18 03:07:05 -0700499 if (fc->minor < 9)
500 req->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE;
501 else
502 req->out.args[0].size = sizeof(outarg);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700503 req->out.args[0].value = &outarg;
Tejun Heob93f8582008-11-26 12:03:55 +0100504 fuse_request_send(fc, req);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700505 err = req->out.h.error;
Miklos Szeredi2d510132006-11-25 11:09:20 -0800506 fuse_put_request(fc, req);
507 if (err)
508 goto out_put_forget_req;
509
Miklos Szeredi39ee0592006-01-06 00:19:43 -0800510 err = -EIO;
511 if (invalid_nodeid(outarg.nodeid))
Miklos Szeredi2d510132006-11-25 11:09:20 -0800512 goto out_put_forget_req;
Miklos Szeredi39ee0592006-01-06 00:19:43 -0800513
514 if ((outarg.attr.mode ^ mode) & S_IFMT)
Miklos Szeredi2d510132006-11-25 11:09:20 -0800515 goto out_put_forget_req;
Miklos Szeredi39ee0592006-01-06 00:19:43 -0800516
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700517 inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation,
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700518 &outarg.attr, entry_attr_timeout(&outarg), 0);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700519 if (!inode) {
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100520 fuse_queue_forget(fc, forget, outarg.nodeid, 1);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700521 return -ENOMEM;
522 }
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100523 kfree(forget);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700524
Miklos Szeredid2a85162006-10-17 00:10:11 -0700525 if (S_ISDIR(inode->i_mode)) {
526 struct dentry *alias;
527 mutex_lock(&fc->inst_mutex);
528 alias = d_find_alias(inode);
529 if (alias) {
530 /* New directory must have moved since mkdir */
531 mutex_unlock(&fc->inst_mutex);
532 dput(alias);
533 iput(inode);
534 return -EBUSY;
535 }
536 d_instantiate(entry, inode);
537 mutex_unlock(&fc->inst_mutex);
538 } else
539 d_instantiate(entry, inode);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700540
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700541 fuse_change_entry_timeout(entry, &outarg);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700542 fuse_invalidate_attr(dir);
543 return 0;
Miklos Szeredi39ee0592006-01-06 00:19:43 -0800544
Miklos Szeredi2d510132006-11-25 11:09:20 -0800545 out_put_forget_req:
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100546 kfree(forget);
Miklos Szeredi39ee0592006-01-06 00:19:43 -0800547 return err;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700548}
549
550static int fuse_mknod(struct inode *dir, struct dentry *entry, int mode,
551 dev_t rdev)
552{
553 struct fuse_mknod_in inarg;
554 struct fuse_conn *fc = get_fuse_conn(dir);
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700555 struct fuse_req *req = fuse_get_req(fc);
556 if (IS_ERR(req))
557 return PTR_ERR(req);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700558
Miklos Szeredie0a43dd2009-06-30 20:12:23 +0200559 if (!fc->dont_mask)
560 mode &= ~current_umask();
561
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700562 memset(&inarg, 0, sizeof(inarg));
563 inarg.mode = mode;
564 inarg.rdev = new_encode_dev(rdev);
Miklos Szeredie0a43dd2009-06-30 20:12:23 +0200565 inarg.umask = current_umask();
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700566 req->in.h.opcode = FUSE_MKNOD;
567 req->in.numargs = 2;
Miklos Szeredie0a43dd2009-06-30 20:12:23 +0200568 req->in.args[0].size = fc->minor < 12 ? FUSE_COMPAT_MKNOD_IN_SIZE :
569 sizeof(inarg);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700570 req->in.args[0].value = &inarg;
571 req->in.args[1].size = entry->d_name.len + 1;
572 req->in.args[1].value = entry->d_name.name;
573 return create_new_entry(fc, req, dir, entry, mode);
574}
575
576static int fuse_create(struct inode *dir, struct dentry *entry, int mode,
577 struct nameidata *nd)
578{
Miklos Szeredib9ba3472007-05-23 13:57:32 -0700579 if (nd && (nd->flags & LOOKUP_OPEN)) {
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800580 int err = fuse_create_open(dir, entry, mode, nd);
581 if (err != -ENOSYS)
582 return err;
583 /* Fall back on mknod */
584 }
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700585 return fuse_mknod(dir, entry, mode, 0);
586}
587
588static int fuse_mkdir(struct inode *dir, struct dentry *entry, int mode)
589{
590 struct fuse_mkdir_in inarg;
591 struct fuse_conn *fc = get_fuse_conn(dir);
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700592 struct fuse_req *req = fuse_get_req(fc);
593 if (IS_ERR(req))
594 return PTR_ERR(req);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700595
Miklos Szeredie0a43dd2009-06-30 20:12:23 +0200596 if (!fc->dont_mask)
597 mode &= ~current_umask();
598
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700599 memset(&inarg, 0, sizeof(inarg));
600 inarg.mode = mode;
Miklos Szeredie0a43dd2009-06-30 20:12:23 +0200601 inarg.umask = current_umask();
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700602 req->in.h.opcode = FUSE_MKDIR;
603 req->in.numargs = 2;
604 req->in.args[0].size = sizeof(inarg);
605 req->in.args[0].value = &inarg;
606 req->in.args[1].size = entry->d_name.len + 1;
607 req->in.args[1].value = entry->d_name.name;
608 return create_new_entry(fc, req, dir, entry, S_IFDIR);
609}
610
611static int fuse_symlink(struct inode *dir, struct dentry *entry,
612 const char *link)
613{
614 struct fuse_conn *fc = get_fuse_conn(dir);
615 unsigned len = strlen(link) + 1;
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700616 struct fuse_req *req = fuse_get_req(fc);
617 if (IS_ERR(req))
618 return PTR_ERR(req);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700619
620 req->in.h.opcode = FUSE_SYMLINK;
621 req->in.numargs = 2;
622 req->in.args[0].size = entry->d_name.len + 1;
623 req->in.args[0].value = entry->d_name.name;
624 req->in.args[1].size = len;
625 req->in.args[1].value = link;
626 return create_new_entry(fc, req, dir, entry, S_IFLNK);
627}
628
629static int fuse_unlink(struct inode *dir, struct dentry *entry)
630{
631 int err;
632 struct fuse_conn *fc = get_fuse_conn(dir);
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700633 struct fuse_req *req = fuse_get_req(fc);
634 if (IS_ERR(req))
635 return PTR_ERR(req);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700636
637 req->in.h.opcode = FUSE_UNLINK;
638 req->in.h.nodeid = get_node_id(dir);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700639 req->in.numargs = 1;
640 req->in.args[0].size = entry->d_name.len + 1;
641 req->in.args[0].value = entry->d_name.name;
Tejun Heob93f8582008-11-26 12:03:55 +0100642 fuse_request_send(fc, req);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700643 err = req->out.h.error;
644 fuse_put_request(fc, req);
645 if (!err) {
646 struct inode *inode = entry->d_inode;
647
Miklos Szeredi1729a162008-11-26 12:03:54 +0100648 /*
649 * Set nlink to zero so the inode can be cleared, if the inode
650 * does have more links this will be discovered at the next
651 * lookup/getattr.
652 */
Dave Hansence71ec32006-09-30 23:29:06 -0700653 clear_nlink(inode);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700654 fuse_invalidate_attr(inode);
655 fuse_invalidate_attr(dir);
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -0800656 fuse_invalidate_entry_cache(entry);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700657 } else if (err == -EINTR)
658 fuse_invalidate_entry(entry);
659 return err;
660}
661
662static int fuse_rmdir(struct inode *dir, struct dentry *entry)
663{
664 int err;
665 struct fuse_conn *fc = get_fuse_conn(dir);
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700666 struct fuse_req *req = fuse_get_req(fc);
667 if (IS_ERR(req))
668 return PTR_ERR(req);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700669
670 req->in.h.opcode = FUSE_RMDIR;
671 req->in.h.nodeid = get_node_id(dir);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700672 req->in.numargs = 1;
673 req->in.args[0].size = entry->d_name.len + 1;
674 req->in.args[0].value = entry->d_name.name;
Tejun Heob93f8582008-11-26 12:03:55 +0100675 fuse_request_send(fc, req);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700676 err = req->out.h.error;
677 fuse_put_request(fc, req);
678 if (!err) {
Dave Hansence71ec32006-09-30 23:29:06 -0700679 clear_nlink(entry->d_inode);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700680 fuse_invalidate_attr(dir);
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -0800681 fuse_invalidate_entry_cache(entry);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700682 } else if (err == -EINTR)
683 fuse_invalidate_entry(entry);
684 return err;
685}
686
687static int fuse_rename(struct inode *olddir, struct dentry *oldent,
688 struct inode *newdir, struct dentry *newent)
689{
690 int err;
691 struct fuse_rename_in inarg;
692 struct fuse_conn *fc = get_fuse_conn(olddir);
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700693 struct fuse_req *req = fuse_get_req(fc);
694 if (IS_ERR(req))
695 return PTR_ERR(req);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700696
697 memset(&inarg, 0, sizeof(inarg));
698 inarg.newdir = get_node_id(newdir);
699 req->in.h.opcode = FUSE_RENAME;
700 req->in.h.nodeid = get_node_id(olddir);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700701 req->in.numargs = 3;
702 req->in.args[0].size = sizeof(inarg);
703 req->in.args[0].value = &inarg;
704 req->in.args[1].size = oldent->d_name.len + 1;
705 req->in.args[1].value = oldent->d_name.name;
706 req->in.args[2].size = newent->d_name.len + 1;
707 req->in.args[2].value = newent->d_name.name;
Tejun Heob93f8582008-11-26 12:03:55 +0100708 fuse_request_send(fc, req);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700709 err = req->out.h.error;
710 fuse_put_request(fc, req);
711 if (!err) {
Miklos Szeredi08b63302007-11-28 16:22:03 -0800712 /* ctime changes */
713 fuse_invalidate_attr(oldent->d_inode);
714
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700715 fuse_invalidate_attr(olddir);
716 if (olddir != newdir)
717 fuse_invalidate_attr(newdir);
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -0800718
719 /* newent will end up negative */
Miklos Szeredi5219f342009-11-04 10:24:52 +0100720 if (newent->d_inode) {
721 fuse_invalidate_attr(newent->d_inode);
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -0800722 fuse_invalidate_entry_cache(newent);
Miklos Szeredi5219f342009-11-04 10:24:52 +0100723 }
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700724 } else if (err == -EINTR) {
725 /* If request was interrupted, DEITY only knows if the
726 rename actually took place. If the invalidation
727 fails (e.g. some process has CWD under the renamed
728 directory), then there can be inconsistency between
729 the dcache and the real filesystem. Tough luck. */
730 fuse_invalidate_entry(oldent);
731 if (newent->d_inode)
732 fuse_invalidate_entry(newent);
733 }
734
735 return err;
736}
737
738static int fuse_link(struct dentry *entry, struct inode *newdir,
739 struct dentry *newent)
740{
741 int err;
742 struct fuse_link_in inarg;
743 struct inode *inode = entry->d_inode;
744 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700745 struct fuse_req *req = fuse_get_req(fc);
746 if (IS_ERR(req))
747 return PTR_ERR(req);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700748
749 memset(&inarg, 0, sizeof(inarg));
750 inarg.oldnodeid = get_node_id(inode);
751 req->in.h.opcode = FUSE_LINK;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700752 req->in.numargs = 2;
753 req->in.args[0].size = sizeof(inarg);
754 req->in.args[0].value = &inarg;
755 req->in.args[1].size = newent->d_name.len + 1;
756 req->in.args[1].value = newent->d_name.name;
757 err = create_new_entry(fc, req, newdir, newent, inode->i_mode);
758 /* Contrary to "normal" filesystems it can happen that link
759 makes two "logical" inodes point to the same "physical"
760 inode. We invalidate the attributes of the old one, so it
761 will reflect changes in the backing inode (link count,
762 etc.)
763 */
764 if (!err || err == -EINTR)
765 fuse_invalidate_attr(inode);
766 return err;
767}
768
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700769static void fuse_fillattr(struct inode *inode, struct fuse_attr *attr,
770 struct kstat *stat)
771{
772 stat->dev = inode->i_sb->s_dev;
773 stat->ino = attr->ino;
774 stat->mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777);
775 stat->nlink = attr->nlink;
776 stat->uid = attr->uid;
777 stat->gid = attr->gid;
778 stat->rdev = inode->i_rdev;
779 stat->atime.tv_sec = attr->atime;
780 stat->atime.tv_nsec = attr->atimensec;
781 stat->mtime.tv_sec = attr->mtime;
782 stat->mtime.tv_nsec = attr->mtimensec;
783 stat->ctime.tv_sec = attr->ctime;
784 stat->ctime.tv_nsec = attr->ctimensec;
785 stat->size = attr->size;
786 stat->blocks = attr->blocks;
787 stat->blksize = (1 << inode->i_blkbits);
788}
789
Miklos Szeredic79e3222007-10-18 03:06:59 -0700790static int fuse_do_getattr(struct inode *inode, struct kstat *stat,
791 struct file *file)
Miklos Szeredie5e55582005-09-09 13:10:28 -0700792{
793 int err;
Miklos Szeredic79e3222007-10-18 03:06:59 -0700794 struct fuse_getattr_in inarg;
795 struct fuse_attr_out outarg;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700796 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700797 struct fuse_req *req;
798 u64 attr_version;
799
800 req = fuse_get_req(fc);
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700801 if (IS_ERR(req))
802 return PTR_ERR(req);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700803
Miklos Szeredi7dca9fd2007-11-28 16:21:59 -0800804 attr_version = fuse_get_attr_version(fc);
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700805
Miklos Szeredic79e3222007-10-18 03:06:59 -0700806 memset(&inarg, 0, sizeof(inarg));
Miklos Szeredi0e9663e2007-10-18 03:07:05 -0700807 memset(&outarg, 0, sizeof(outarg));
Miklos Szeredic79e3222007-10-18 03:06:59 -0700808 /* Directories have separate file-handle space */
809 if (file && S_ISREG(inode->i_mode)) {
810 struct fuse_file *ff = file->private_data;
811
812 inarg.getattr_flags |= FUSE_GETATTR_FH;
813 inarg.fh = ff->fh;
814 }
Miklos Szeredie5e55582005-09-09 13:10:28 -0700815 req->in.h.opcode = FUSE_GETATTR;
816 req->in.h.nodeid = get_node_id(inode);
Miklos Szeredic79e3222007-10-18 03:06:59 -0700817 req->in.numargs = 1;
818 req->in.args[0].size = sizeof(inarg);
819 req->in.args[0].value = &inarg;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700820 req->out.numargs = 1;
Miklos Szeredi0e9663e2007-10-18 03:07:05 -0700821 if (fc->minor < 9)
822 req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE;
823 else
824 req->out.args[0].size = sizeof(outarg);
Miklos Szeredic79e3222007-10-18 03:06:59 -0700825 req->out.args[0].value = &outarg;
Tejun Heob93f8582008-11-26 12:03:55 +0100826 fuse_request_send(fc, req);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700827 err = req->out.h.error;
828 fuse_put_request(fc, req);
829 if (!err) {
Miklos Szeredic79e3222007-10-18 03:06:59 -0700830 if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) {
Miklos Szeredie5e55582005-09-09 13:10:28 -0700831 make_bad_inode(inode);
832 err = -EIO;
833 } else {
Miklos Szeredic79e3222007-10-18 03:06:59 -0700834 fuse_change_attributes(inode, &outarg.attr,
835 attr_timeout(&outarg),
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700836 attr_version);
837 if (stat)
Miklos Szeredic79e3222007-10-18 03:06:59 -0700838 fuse_fillattr(inode, &outarg.attr, stat);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700839 }
840 }
841 return err;
842}
843
Miklos Szeredibcb4be82007-11-28 16:21:59 -0800844int fuse_update_attributes(struct inode *inode, struct kstat *stat,
845 struct file *file, bool *refreshed)
846{
847 struct fuse_inode *fi = get_fuse_inode(inode);
848 int err;
849 bool r;
850
851 if (fi->i_time < get_jiffies_64()) {
852 r = true;
853 err = fuse_do_getattr(inode, stat, file);
854 } else {
855 r = false;
856 err = 0;
857 if (stat) {
858 generic_fillattr(inode, stat);
859 stat->mode = fi->orig_i_mode;
860 }
861 }
862
863 if (refreshed != NULL)
864 *refreshed = r;
865
866 return err;
867}
868
John Muir3b463ae2009-05-31 11:13:57 -0400869int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid,
870 struct qstr *name)
871{
872 int err = -ENOTDIR;
873 struct inode *parent;
874 struct dentry *dir;
875 struct dentry *entry;
876
877 parent = ilookup5(sb, parent_nodeid, fuse_inode_eq, &parent_nodeid);
878 if (!parent)
879 return -ENOENT;
880
881 mutex_lock(&parent->i_mutex);
882 if (!S_ISDIR(parent->i_mode))
883 goto unlock;
884
885 err = -ENOENT;
886 dir = d_find_alias(parent);
887 if (!dir)
888 goto unlock;
889
890 entry = d_lookup(dir, name);
891 dput(dir);
892 if (!entry)
893 goto unlock;
894
895 fuse_invalidate_attr(parent);
896 fuse_invalidate_entry(entry);
897 dput(entry);
898 err = 0;
899
900 unlock:
901 mutex_unlock(&parent->i_mutex);
902 iput(parent);
903 return err;
904}
905
Miklos Szeredi87729a52005-09-09 13:10:34 -0700906/*
907 * Calling into a user-controlled filesystem gives the filesystem
908 * daemon ptrace-like capabilities over the requester process. This
909 * means, that the filesystem daemon is able to record the exact
910 * filesystem operations performed, and can also control the behavior
911 * of the requester process in otherwise impossible ways. For example
912 * it can delay the operation for arbitrary length of time allowing
913 * DoS against the requester.
914 *
915 * For this reason only those processes can call into the filesystem,
916 * for which the owner of the mount has ptrace privilege. This
917 * excludes processes started by other users, suid or sgid processes.
918 */
Miklos Szeredie57ac682007-10-18 03:06:58 -0700919int fuse_allow_task(struct fuse_conn *fc, struct task_struct *task)
Miklos Szeredi87729a52005-09-09 13:10:34 -0700920{
David Howellsc69e8d92008-11-14 10:39:19 +1100921 const struct cred *cred;
922 int ret;
923
Miklos Szeredi87729a52005-09-09 13:10:34 -0700924 if (fc->flags & FUSE_ALLOW_OTHER)
925 return 1;
926
David Howellsc69e8d92008-11-14 10:39:19 +1100927 rcu_read_lock();
928 ret = 0;
929 cred = __task_cred(task);
930 if (cred->euid == fc->user_id &&
931 cred->suid == fc->user_id &&
932 cred->uid == fc->user_id &&
933 cred->egid == fc->group_id &&
934 cred->sgid == fc->group_id &&
935 cred->gid == fc->group_id)
936 ret = 1;
937 rcu_read_unlock();
Miklos Szeredi87729a52005-09-09 13:10:34 -0700938
David Howellsc69e8d92008-11-14 10:39:19 +1100939 return ret;
Miklos Szeredi87729a52005-09-09 13:10:34 -0700940}
941
Miklos Szeredi31d40d72005-11-07 00:59:50 -0800942static int fuse_access(struct inode *inode, int mask)
943{
944 struct fuse_conn *fc = get_fuse_conn(inode);
945 struct fuse_req *req;
946 struct fuse_access_in inarg;
947 int err;
948
949 if (fc->no_access)
950 return 0;
951
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700952 req = fuse_get_req(fc);
953 if (IS_ERR(req))
954 return PTR_ERR(req);
Miklos Szeredi31d40d72005-11-07 00:59:50 -0800955
956 memset(&inarg, 0, sizeof(inarg));
Al Viroe6305c42008-07-15 21:03:57 -0400957 inarg.mask = mask & (MAY_READ | MAY_WRITE | MAY_EXEC);
Miklos Szeredi31d40d72005-11-07 00:59:50 -0800958 req->in.h.opcode = FUSE_ACCESS;
959 req->in.h.nodeid = get_node_id(inode);
Miklos Szeredi31d40d72005-11-07 00:59:50 -0800960 req->in.numargs = 1;
961 req->in.args[0].size = sizeof(inarg);
962 req->in.args[0].value = &inarg;
Tejun Heob93f8582008-11-26 12:03:55 +0100963 fuse_request_send(fc, req);
Miklos Szeredi31d40d72005-11-07 00:59:50 -0800964 err = req->out.h.error;
965 fuse_put_request(fc, req);
966 if (err == -ENOSYS) {
967 fc->no_access = 1;
968 err = 0;
969 }
970 return err;
971}
972
Miklos Szeredi6f9f1182006-01-06 00:19:39 -0800973/*
974 * Check permission. The two basic access models of FUSE are:
975 *
976 * 1) Local access checking ('default_permissions' mount option) based
977 * on file mode. This is the plain old disk filesystem permission
978 * modell.
979 *
980 * 2) "Remote" access checking, where server is responsible for
981 * checking permission in each inode operation. An exception to this
982 * is if ->permission() was invoked from sys_access() in which case an
983 * access request is sent. Execute permission is still checked
984 * locally based on file mode.
985 */
Nick Pigginb74c79e2011-01-07 17:49:58 +1100986static int fuse_permission(struct inode *inode, int mask, unsigned int flags)
Miklos Szeredie5e55582005-09-09 13:10:28 -0700987{
988 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredi244f6382007-10-16 23:31:02 -0700989 bool refreshed = false;
990 int err = 0;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700991
Nick Pigginb74c79e2011-01-07 17:49:58 +1100992 if (flags & IPERM_FLAG_RCU)
993 return -ECHILD;
994
Miklos Szeredi87729a52005-09-09 13:10:34 -0700995 if (!fuse_allow_task(fc, current))
Miklos Szeredie5e55582005-09-09 13:10:28 -0700996 return -EACCES;
Miklos Szeredi244f6382007-10-16 23:31:02 -0700997
998 /*
Miklos Szeredie8e96152007-10-16 23:31:06 -0700999 * If attributes are needed, refresh them before proceeding
Miklos Szeredi244f6382007-10-16 23:31:02 -07001000 */
Miklos Szeredie8e96152007-10-16 23:31:06 -07001001 if ((fc->flags & FUSE_DEFAULT_PERMISSIONS) ||
1002 ((mask & MAY_EXEC) && S_ISREG(inode->i_mode))) {
Miklos Szeredibcb4be82007-11-28 16:21:59 -08001003 err = fuse_update_attributes(inode, NULL, NULL, &refreshed);
1004 if (err)
1005 return err;
Miklos Szeredi244f6382007-10-16 23:31:02 -07001006 }
1007
1008 if (fc->flags & FUSE_DEFAULT_PERMISSIONS) {
Nick Pigginb74c79e2011-01-07 17:49:58 +11001009 err = generic_permission(inode, mask, flags, NULL);
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -07001010
1011 /* If permission is denied, try to refresh file
1012 attributes. This is also needed, because the root
1013 node will at first have no permissions */
Miklos Szeredi244f6382007-10-16 23:31:02 -07001014 if (err == -EACCES && !refreshed) {
Miklos Szeredic79e3222007-10-18 03:06:59 -07001015 err = fuse_do_getattr(inode, NULL, NULL);
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -07001016 if (!err)
Nick Pigginb74c79e2011-01-07 17:49:58 +11001017 err = generic_permission(inode, mask,
1018 flags, NULL);
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -07001019 }
1020
Miklos Szeredi6f9f1182006-01-06 00:19:39 -08001021 /* Note: the opposite of the above test does not
1022 exist. So if permissions are revoked this won't be
1023 noticed immediately, only after the attribute
1024 timeout has expired */
Eric Paris9cfcac82010-07-23 11:43:51 -04001025 } else if (mask & (MAY_ACCESS | MAY_CHDIR)) {
Miklos Szeredie8e96152007-10-16 23:31:06 -07001026 err = fuse_access(inode, mask);
1027 } else if ((mask & MAY_EXEC) && S_ISREG(inode->i_mode)) {
1028 if (!(inode->i_mode & S_IXUGO)) {
1029 if (refreshed)
1030 return -EACCES;
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -07001031
Miklos Szeredic79e3222007-10-18 03:06:59 -07001032 err = fuse_do_getattr(inode, NULL, NULL);
Miklos Szeredie8e96152007-10-16 23:31:06 -07001033 if (!err && !(inode->i_mode & S_IXUGO))
1034 return -EACCES;
1035 }
Miklos Szeredie5e55582005-09-09 13:10:28 -07001036 }
Miklos Szeredi244f6382007-10-16 23:31:02 -07001037 return err;
Miklos Szeredie5e55582005-09-09 13:10:28 -07001038}
1039
1040static int parse_dirfile(char *buf, size_t nbytes, struct file *file,
1041 void *dstbuf, filldir_t filldir)
1042{
1043 while (nbytes >= FUSE_NAME_OFFSET) {
1044 struct fuse_dirent *dirent = (struct fuse_dirent *) buf;
1045 size_t reclen = FUSE_DIRENT_SIZE(dirent);
1046 int over;
1047 if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX)
1048 return -EIO;
1049 if (reclen > nbytes)
1050 break;
1051
1052 over = filldir(dstbuf, dirent->name, dirent->namelen,
1053 file->f_pos, dirent->ino, dirent->type);
1054 if (over)
1055 break;
1056
1057 buf += reclen;
1058 nbytes -= reclen;
1059 file->f_pos = dirent->off;
1060 }
1061
1062 return 0;
1063}
1064
Miklos Szeredie5e55582005-09-09 13:10:28 -07001065static int fuse_readdir(struct file *file, void *dstbuf, filldir_t filldir)
1066{
Miklos Szeredi04730fe2005-09-09 13:10:36 -07001067 int err;
1068 size_t nbytes;
1069 struct page *page;
Josef Sipek7706a9d2006-12-08 02:37:02 -08001070 struct inode *inode = file->f_path.dentry->d_inode;
Miklos Szeredi04730fe2005-09-09 13:10:36 -07001071 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredi248d86e2006-01-06 00:19:39 -08001072 struct fuse_req *req;
1073
1074 if (is_bad_inode(inode))
1075 return -EIO;
1076
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001077 req = fuse_get_req(fc);
1078 if (IS_ERR(req))
1079 return PTR_ERR(req);
Miklos Szeredie5e55582005-09-09 13:10:28 -07001080
Miklos Szeredi04730fe2005-09-09 13:10:36 -07001081 page = alloc_page(GFP_KERNEL);
1082 if (!page) {
1083 fuse_put_request(fc, req);
Miklos Szeredie5e55582005-09-09 13:10:28 -07001084 return -ENOMEM;
Miklos Szeredi04730fe2005-09-09 13:10:36 -07001085 }
Miklos Szeredif4975c62009-04-02 14:25:34 +02001086 req->out.argpages = 1;
Miklos Szeredi04730fe2005-09-09 13:10:36 -07001087 req->num_pages = 1;
1088 req->pages[0] = page;
Miklos Szeredi2106cb12009-04-28 16:56:37 +02001089 fuse_read_fill(req, file, file->f_pos, PAGE_SIZE, FUSE_READDIR);
Tejun Heob93f8582008-11-26 12:03:55 +01001090 fuse_request_send(fc, req);
Miklos Szeredi361b1eb52006-01-16 22:14:45 -08001091 nbytes = req->out.args[0].size;
Miklos Szeredi04730fe2005-09-09 13:10:36 -07001092 err = req->out.h.error;
1093 fuse_put_request(fc, req);
1094 if (!err)
1095 err = parse_dirfile(page_address(page), nbytes, file, dstbuf,
1096 filldir);
Miklos Szeredie5e55582005-09-09 13:10:28 -07001097
Miklos Szeredi04730fe2005-09-09 13:10:36 -07001098 __free_page(page);
Miklos Szeredib36c31b2005-09-09 13:10:38 -07001099 fuse_invalidate_attr(inode); /* atime changed */
Miklos Szeredi04730fe2005-09-09 13:10:36 -07001100 return err;
Miklos Szeredie5e55582005-09-09 13:10:28 -07001101}
1102
1103static char *read_link(struct dentry *dentry)
1104{
1105 struct inode *inode = dentry->d_inode;
1106 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001107 struct fuse_req *req = fuse_get_req(fc);
Miklos Szeredie5e55582005-09-09 13:10:28 -07001108 char *link;
1109
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001110 if (IS_ERR(req))
David Howellse231c2e2008-02-07 00:15:26 -08001111 return ERR_CAST(req);
Miklos Szeredie5e55582005-09-09 13:10:28 -07001112
1113 link = (char *) __get_free_page(GFP_KERNEL);
1114 if (!link) {
1115 link = ERR_PTR(-ENOMEM);
1116 goto out;
1117 }
1118 req->in.h.opcode = FUSE_READLINK;
1119 req->in.h.nodeid = get_node_id(inode);
Miklos Szeredie5e55582005-09-09 13:10:28 -07001120 req->out.argvar = 1;
1121 req->out.numargs = 1;
1122 req->out.args[0].size = PAGE_SIZE - 1;
1123 req->out.args[0].value = link;
Tejun Heob93f8582008-11-26 12:03:55 +01001124 fuse_request_send(fc, req);
Miklos Szeredie5e55582005-09-09 13:10:28 -07001125 if (req->out.h.error) {
1126 free_page((unsigned long) link);
1127 link = ERR_PTR(req->out.h.error);
1128 } else
1129 link[req->out.args[0].size] = '\0';
1130 out:
1131 fuse_put_request(fc, req);
Miklos Szeredib36c31b2005-09-09 13:10:38 -07001132 fuse_invalidate_attr(inode); /* atime changed */
Miklos Szeredie5e55582005-09-09 13:10:28 -07001133 return link;
1134}
1135
1136static void free_link(char *link)
1137{
1138 if (!IS_ERR(link))
1139 free_page((unsigned long) link);
1140}
1141
1142static void *fuse_follow_link(struct dentry *dentry, struct nameidata *nd)
1143{
1144 nd_set_link(nd, read_link(dentry));
1145 return NULL;
1146}
1147
1148static void fuse_put_link(struct dentry *dentry, struct nameidata *nd, void *c)
1149{
1150 free_link(nd_get_link(nd));
1151}
1152
1153static int fuse_dir_open(struct inode *inode, struct file *file)
1154{
Miklos Szeredi91fe96b2009-04-28 16:56:37 +02001155 return fuse_open_common(inode, file, true);
Miklos Szeredie5e55582005-09-09 13:10:28 -07001156}
1157
1158static int fuse_dir_release(struct inode *inode, struct file *file)
1159{
Miklos Szeredi8b0797a2009-04-28 16:56:39 +02001160 fuse_release_common(file, FUSE_RELEASEDIR);
1161
1162 return 0;
Miklos Szeredie5e55582005-09-09 13:10:28 -07001163}
1164
Christoph Hellwig7ea80852010-05-26 17:53:25 +02001165static int fuse_dir_fsync(struct file *file, int datasync)
Miklos Szeredi82547982005-09-09 13:10:38 -07001166{
Christoph Hellwig7ea80852010-05-26 17:53:25 +02001167 return fuse_fsync_common(file, datasync, 1);
Miklos Szeredi82547982005-09-09 13:10:38 -07001168}
1169
Miklos Szeredi17637cb2007-10-18 03:07:01 -07001170static bool update_mtime(unsigned ivalid)
1171{
1172 /* Always update if mtime is explicitly set */
1173 if (ivalid & ATTR_MTIME_SET)
1174 return true;
1175
1176 /* If it's an open(O_TRUNC) or an ftruncate(), don't update */
1177 if ((ivalid & ATTR_SIZE) && (ivalid & (ATTR_OPEN | ATTR_FILE)))
1178 return false;
1179
1180 /* In all other cases update */
1181 return true;
1182}
1183
Miklos Szeredibefc6492005-11-07 00:59:52 -08001184static void iattr_to_fattr(struct iattr *iattr, struct fuse_setattr_in *arg)
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001185{
1186 unsigned ivalid = iattr->ia_valid;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001187
1188 if (ivalid & ATTR_MODE)
Miklos Szeredibefc6492005-11-07 00:59:52 -08001189 arg->valid |= FATTR_MODE, arg->mode = iattr->ia_mode;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001190 if (ivalid & ATTR_UID)
Miklos Szeredibefc6492005-11-07 00:59:52 -08001191 arg->valid |= FATTR_UID, arg->uid = iattr->ia_uid;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001192 if (ivalid & ATTR_GID)
Miklos Szeredibefc6492005-11-07 00:59:52 -08001193 arg->valid |= FATTR_GID, arg->gid = iattr->ia_gid;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001194 if (ivalid & ATTR_SIZE)
Miklos Szeredibefc6492005-11-07 00:59:52 -08001195 arg->valid |= FATTR_SIZE, arg->size = iattr->ia_size;
Miklos Szeredi17637cb2007-10-18 03:07:01 -07001196 if (ivalid & ATTR_ATIME) {
1197 arg->valid |= FATTR_ATIME;
Miklos Szeredibefc6492005-11-07 00:59:52 -08001198 arg->atime = iattr->ia_atime.tv_sec;
Miklos Szeredi17637cb2007-10-18 03:07:01 -07001199 arg->atimensec = iattr->ia_atime.tv_nsec;
1200 if (!(ivalid & ATTR_ATIME_SET))
1201 arg->valid |= FATTR_ATIME_NOW;
1202 }
1203 if ((ivalid & ATTR_MTIME) && update_mtime(ivalid)) {
1204 arg->valid |= FATTR_MTIME;
Miklos Szeredibefc6492005-11-07 00:59:52 -08001205 arg->mtime = iattr->ia_mtime.tv_sec;
Miklos Szeredi17637cb2007-10-18 03:07:01 -07001206 arg->mtimensec = iattr->ia_mtime.tv_nsec;
1207 if (!(ivalid & ATTR_MTIME_SET))
1208 arg->valid |= FATTR_MTIME_NOW;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001209 }
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001210}
1211
Miklos Szeredi6f9f1182006-01-06 00:19:39 -08001212/*
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001213 * Prevent concurrent writepages on inode
1214 *
1215 * This is done by adding a negative bias to the inode write counter
1216 * and waiting for all pending writes to finish.
1217 */
1218void fuse_set_nowrite(struct inode *inode)
1219{
1220 struct fuse_conn *fc = get_fuse_conn(inode);
1221 struct fuse_inode *fi = get_fuse_inode(inode);
1222
1223 BUG_ON(!mutex_is_locked(&inode->i_mutex));
1224
1225 spin_lock(&fc->lock);
1226 BUG_ON(fi->writectr < 0);
1227 fi->writectr += FUSE_NOWRITE;
1228 spin_unlock(&fc->lock);
1229 wait_event(fi->page_waitq, fi->writectr == FUSE_NOWRITE);
1230}
1231
1232/*
1233 * Allow writepages on inode
1234 *
1235 * Remove the bias from the writecounter and send any queued
1236 * writepages.
1237 */
1238static void __fuse_release_nowrite(struct inode *inode)
1239{
1240 struct fuse_inode *fi = get_fuse_inode(inode);
1241
1242 BUG_ON(fi->writectr != FUSE_NOWRITE);
1243 fi->writectr = 0;
1244 fuse_flush_writepages(inode);
1245}
1246
1247void fuse_release_nowrite(struct inode *inode)
1248{
1249 struct fuse_conn *fc = get_fuse_conn(inode);
1250
1251 spin_lock(&fc->lock);
1252 __fuse_release_nowrite(inode);
1253 spin_unlock(&fc->lock);
1254}
1255
1256/*
Miklos Szeredi6f9f1182006-01-06 00:19:39 -08001257 * Set attributes, and at the same time refresh them.
1258 *
1259 * Truncation is slightly complicated, because the 'truncate' request
1260 * may fail, in which case we don't want to touch the mapping.
Miklos Szeredi9ffbb912006-10-17 00:10:06 -07001261 * vmtruncate() doesn't allow for this case, so do the rlimit checking
1262 * and the actual truncation by hand.
Miklos Szeredi6f9f1182006-01-06 00:19:39 -08001263 */
Miklos Szeredi49d49142007-10-18 03:07:00 -07001264static int fuse_do_setattr(struct dentry *entry, struct iattr *attr,
1265 struct file *file)
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001266{
1267 struct inode *inode = entry->d_inode;
1268 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001269 struct fuse_req *req;
1270 struct fuse_setattr_in inarg;
1271 struct fuse_attr_out outarg;
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001272 bool is_truncate = false;
1273 loff_t oldsize;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001274 int err;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001275
Miklos Szeredie57ac682007-10-18 03:06:58 -07001276 if (!fuse_allow_task(fc, current))
1277 return -EACCES;
1278
Christoph Hellwigdb78b872010-06-04 11:30:03 +02001279 if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS))
1280 attr->ia_valid |= ATTR_FORCE;
1281
1282 err = inode_change_ok(inode, attr);
1283 if (err)
1284 return err;
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -07001285
Miklos Szeredi6ff958e2007-10-18 03:07:02 -07001286 if ((attr->ia_valid & ATTR_OPEN) && fc->atomic_o_trunc)
1287 return 0;
1288
Christoph Hellwig2c27c652010-06-04 11:30:04 +02001289 if (attr->ia_valid & ATTR_SIZE)
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001290 is_truncate = true;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001291
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001292 req = fuse_get_req(fc);
1293 if (IS_ERR(req))
1294 return PTR_ERR(req);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001295
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001296 if (is_truncate)
1297 fuse_set_nowrite(inode);
1298
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001299 memset(&inarg, 0, sizeof(inarg));
Miklos Szeredi0e9663e2007-10-18 03:07:05 -07001300 memset(&outarg, 0, sizeof(outarg));
Miklos Szeredibefc6492005-11-07 00:59:52 -08001301 iattr_to_fattr(attr, &inarg);
Miklos Szeredi49d49142007-10-18 03:07:00 -07001302 if (file) {
1303 struct fuse_file *ff = file->private_data;
1304 inarg.valid |= FATTR_FH;
1305 inarg.fh = ff->fh;
1306 }
Miklos Szeredif3332112007-10-18 03:07:04 -07001307 if (attr->ia_valid & ATTR_SIZE) {
1308 /* For mandatory locking in truncate */
1309 inarg.valid |= FATTR_LOCKOWNER;
1310 inarg.lock_owner = fuse_lock_owner_id(fc, current->files);
1311 }
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001312 req->in.h.opcode = FUSE_SETATTR;
1313 req->in.h.nodeid = get_node_id(inode);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001314 req->in.numargs = 1;
1315 req->in.args[0].size = sizeof(inarg);
1316 req->in.args[0].value = &inarg;
1317 req->out.numargs = 1;
Miklos Szeredi0e9663e2007-10-18 03:07:05 -07001318 if (fc->minor < 9)
1319 req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE;
1320 else
1321 req->out.args[0].size = sizeof(outarg);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001322 req->out.args[0].value = &outarg;
Tejun Heob93f8582008-11-26 12:03:55 +01001323 fuse_request_send(fc, req);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001324 err = req->out.h.error;
1325 fuse_put_request(fc, req);
Miklos Szeredie00d2c22007-10-16 23:31:01 -07001326 if (err) {
1327 if (err == -EINTR)
1328 fuse_invalidate_attr(inode);
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001329 goto error;
Miklos Szeredie00d2c22007-10-16 23:31:01 -07001330 }
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001331
Miklos Szeredie00d2c22007-10-16 23:31:01 -07001332 if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) {
1333 make_bad_inode(inode);
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001334 err = -EIO;
1335 goto error;
Miklos Szeredie00d2c22007-10-16 23:31:01 -07001336 }
1337
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001338 spin_lock(&fc->lock);
1339 fuse_change_attributes_common(inode, &outarg.attr,
1340 attr_timeout(&outarg));
1341 oldsize = inode->i_size;
1342 i_size_write(inode, outarg.attr.size);
1343
1344 if (is_truncate) {
1345 /* NOTE: this may release/reacquire fc->lock */
1346 __fuse_release_nowrite(inode);
1347 }
1348 spin_unlock(&fc->lock);
1349
1350 /*
1351 * Only call invalidate_inode_pages2() after removing
1352 * FUSE_NOWRITE, otherwise fuse_launder_page() would deadlock.
1353 */
1354 if (S_ISREG(inode->i_mode) && oldsize != outarg.attr.size) {
npiggin@suse.dec08d3b02009-08-21 02:35:06 +10001355 truncate_pagecache(inode, oldsize, outarg.attr.size);
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001356 invalidate_inode_pages2(inode->i_mapping);
1357 }
1358
Miklos Szeredie00d2c22007-10-16 23:31:01 -07001359 return 0;
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001360
1361error:
1362 if (is_truncate)
1363 fuse_release_nowrite(inode);
1364
1365 return err;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001366}
1367
Miklos Szeredi49d49142007-10-18 03:07:00 -07001368static int fuse_setattr(struct dentry *entry, struct iattr *attr)
1369{
1370 if (attr->ia_valid & ATTR_FILE)
1371 return fuse_do_setattr(entry, attr, attr->ia_file);
1372 else
1373 return fuse_do_setattr(entry, attr, NULL);
1374}
1375
Miklos Szeredie5e55582005-09-09 13:10:28 -07001376static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry,
1377 struct kstat *stat)
1378{
1379 struct inode *inode = entry->d_inode;
Miklos Szeredi244f6382007-10-16 23:31:02 -07001380 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredi244f6382007-10-16 23:31:02 -07001381
1382 if (!fuse_allow_task(fc, current))
1383 return -EACCES;
1384
Miklos Szeredibcb4be82007-11-28 16:21:59 -08001385 return fuse_update_attributes(inode, stat, NULL, NULL);
Miklos Szeredie5e55582005-09-09 13:10:28 -07001386}
1387
Miklos Szeredi92a87802005-09-09 13:10:31 -07001388static int fuse_setxattr(struct dentry *entry, const char *name,
1389 const void *value, size_t size, int flags)
1390{
1391 struct inode *inode = entry->d_inode;
1392 struct fuse_conn *fc = get_fuse_conn(inode);
1393 struct fuse_req *req;
1394 struct fuse_setxattr_in inarg;
1395 int err;
1396
Miklos Szeredi92a87802005-09-09 13:10:31 -07001397 if (fc->no_setxattr)
1398 return -EOPNOTSUPP;
1399
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001400 req = fuse_get_req(fc);
1401 if (IS_ERR(req))
1402 return PTR_ERR(req);
Miklos Szeredi92a87802005-09-09 13:10:31 -07001403
1404 memset(&inarg, 0, sizeof(inarg));
1405 inarg.size = size;
1406 inarg.flags = flags;
1407 req->in.h.opcode = FUSE_SETXATTR;
1408 req->in.h.nodeid = get_node_id(inode);
Miklos Szeredi92a87802005-09-09 13:10:31 -07001409 req->in.numargs = 3;
1410 req->in.args[0].size = sizeof(inarg);
1411 req->in.args[0].value = &inarg;
1412 req->in.args[1].size = strlen(name) + 1;
1413 req->in.args[1].value = name;
1414 req->in.args[2].size = size;
1415 req->in.args[2].value = value;
Tejun Heob93f8582008-11-26 12:03:55 +01001416 fuse_request_send(fc, req);
Miklos Szeredi92a87802005-09-09 13:10:31 -07001417 err = req->out.h.error;
1418 fuse_put_request(fc, req);
1419 if (err == -ENOSYS) {
1420 fc->no_setxattr = 1;
1421 err = -EOPNOTSUPP;
1422 }
1423 return err;
1424}
1425
1426static ssize_t fuse_getxattr(struct dentry *entry, const char *name,
1427 void *value, size_t size)
1428{
1429 struct inode *inode = entry->d_inode;
1430 struct fuse_conn *fc = get_fuse_conn(inode);
1431 struct fuse_req *req;
1432 struct fuse_getxattr_in inarg;
1433 struct fuse_getxattr_out outarg;
1434 ssize_t ret;
1435
1436 if (fc->no_getxattr)
1437 return -EOPNOTSUPP;
1438
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001439 req = fuse_get_req(fc);
1440 if (IS_ERR(req))
1441 return PTR_ERR(req);
Miklos Szeredi92a87802005-09-09 13:10:31 -07001442
1443 memset(&inarg, 0, sizeof(inarg));
1444 inarg.size = size;
1445 req->in.h.opcode = FUSE_GETXATTR;
1446 req->in.h.nodeid = get_node_id(inode);
Miklos Szeredi92a87802005-09-09 13:10:31 -07001447 req->in.numargs = 2;
1448 req->in.args[0].size = sizeof(inarg);
1449 req->in.args[0].value = &inarg;
1450 req->in.args[1].size = strlen(name) + 1;
1451 req->in.args[1].value = name;
1452 /* This is really two different operations rolled into one */
1453 req->out.numargs = 1;
1454 if (size) {
1455 req->out.argvar = 1;
1456 req->out.args[0].size = size;
1457 req->out.args[0].value = value;
1458 } else {
1459 req->out.args[0].size = sizeof(outarg);
1460 req->out.args[0].value = &outarg;
1461 }
Tejun Heob93f8582008-11-26 12:03:55 +01001462 fuse_request_send(fc, req);
Miklos Szeredi92a87802005-09-09 13:10:31 -07001463 ret = req->out.h.error;
1464 if (!ret)
1465 ret = size ? req->out.args[0].size : outarg.size;
1466 else {
1467 if (ret == -ENOSYS) {
1468 fc->no_getxattr = 1;
1469 ret = -EOPNOTSUPP;
1470 }
1471 }
1472 fuse_put_request(fc, req);
1473 return ret;
1474}
1475
1476static ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size)
1477{
1478 struct inode *inode = entry->d_inode;
1479 struct fuse_conn *fc = get_fuse_conn(inode);
1480 struct fuse_req *req;
1481 struct fuse_getxattr_in inarg;
1482 struct fuse_getxattr_out outarg;
1483 ssize_t ret;
1484
Miklos Szeredie57ac682007-10-18 03:06:58 -07001485 if (!fuse_allow_task(fc, current))
1486 return -EACCES;
1487
Miklos Szeredi92a87802005-09-09 13:10:31 -07001488 if (fc->no_listxattr)
1489 return -EOPNOTSUPP;
1490
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001491 req = fuse_get_req(fc);
1492 if (IS_ERR(req))
1493 return PTR_ERR(req);
Miklos Szeredi92a87802005-09-09 13:10:31 -07001494
1495 memset(&inarg, 0, sizeof(inarg));
1496 inarg.size = size;
1497 req->in.h.opcode = FUSE_LISTXATTR;
1498 req->in.h.nodeid = get_node_id(inode);
Miklos Szeredi92a87802005-09-09 13:10:31 -07001499 req->in.numargs = 1;
1500 req->in.args[0].size = sizeof(inarg);
1501 req->in.args[0].value = &inarg;
1502 /* This is really two different operations rolled into one */
1503 req->out.numargs = 1;
1504 if (size) {
1505 req->out.argvar = 1;
1506 req->out.args[0].size = size;
1507 req->out.args[0].value = list;
1508 } else {
1509 req->out.args[0].size = sizeof(outarg);
1510 req->out.args[0].value = &outarg;
1511 }
Tejun Heob93f8582008-11-26 12:03:55 +01001512 fuse_request_send(fc, req);
Miklos Szeredi92a87802005-09-09 13:10:31 -07001513 ret = req->out.h.error;
1514 if (!ret)
1515 ret = size ? req->out.args[0].size : outarg.size;
1516 else {
1517 if (ret == -ENOSYS) {
1518 fc->no_listxattr = 1;
1519 ret = -EOPNOTSUPP;
1520 }
1521 }
1522 fuse_put_request(fc, req);
1523 return ret;
1524}
1525
1526static int fuse_removexattr(struct dentry *entry, const char *name)
1527{
1528 struct inode *inode = entry->d_inode;
1529 struct fuse_conn *fc = get_fuse_conn(inode);
1530 struct fuse_req *req;
1531 int err;
1532
1533 if (fc->no_removexattr)
1534 return -EOPNOTSUPP;
1535
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001536 req = fuse_get_req(fc);
1537 if (IS_ERR(req))
1538 return PTR_ERR(req);
Miklos Szeredi92a87802005-09-09 13:10:31 -07001539
1540 req->in.h.opcode = FUSE_REMOVEXATTR;
1541 req->in.h.nodeid = get_node_id(inode);
Miklos Szeredi92a87802005-09-09 13:10:31 -07001542 req->in.numargs = 1;
1543 req->in.args[0].size = strlen(name) + 1;
1544 req->in.args[0].value = name;
Tejun Heob93f8582008-11-26 12:03:55 +01001545 fuse_request_send(fc, req);
Miklos Szeredi92a87802005-09-09 13:10:31 -07001546 err = req->out.h.error;
1547 fuse_put_request(fc, req);
1548 if (err == -ENOSYS) {
1549 fc->no_removexattr = 1;
1550 err = -EOPNOTSUPP;
1551 }
1552 return err;
1553}
1554
Arjan van de Ven754661f2007-02-12 00:55:38 -08001555static const struct inode_operations fuse_dir_inode_operations = {
Miklos Szeredie5e55582005-09-09 13:10:28 -07001556 .lookup = fuse_lookup,
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001557 .mkdir = fuse_mkdir,
1558 .symlink = fuse_symlink,
1559 .unlink = fuse_unlink,
1560 .rmdir = fuse_rmdir,
1561 .rename = fuse_rename,
1562 .link = fuse_link,
1563 .setattr = fuse_setattr,
1564 .create = fuse_create,
1565 .mknod = fuse_mknod,
Miklos Szeredie5e55582005-09-09 13:10:28 -07001566 .permission = fuse_permission,
1567 .getattr = fuse_getattr,
Miklos Szeredi92a87802005-09-09 13:10:31 -07001568 .setxattr = fuse_setxattr,
1569 .getxattr = fuse_getxattr,
1570 .listxattr = fuse_listxattr,
1571 .removexattr = fuse_removexattr,
Miklos Szeredie5e55582005-09-09 13:10:28 -07001572};
1573
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08001574static const struct file_operations fuse_dir_operations = {
Miklos Szeredib6aeade2005-09-09 13:10:30 -07001575 .llseek = generic_file_llseek,
Miklos Szeredie5e55582005-09-09 13:10:28 -07001576 .read = generic_read_dir,
1577 .readdir = fuse_readdir,
1578 .open = fuse_dir_open,
1579 .release = fuse_dir_release,
Miklos Szeredi82547982005-09-09 13:10:38 -07001580 .fsync = fuse_dir_fsync,
Miklos Szeredie5e55582005-09-09 13:10:28 -07001581};
1582
Arjan van de Ven754661f2007-02-12 00:55:38 -08001583static const struct inode_operations fuse_common_inode_operations = {
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001584 .setattr = fuse_setattr,
Miklos Szeredie5e55582005-09-09 13:10:28 -07001585 .permission = fuse_permission,
1586 .getattr = fuse_getattr,
Miklos Szeredi92a87802005-09-09 13:10:31 -07001587 .setxattr = fuse_setxattr,
1588 .getxattr = fuse_getxattr,
1589 .listxattr = fuse_listxattr,
1590 .removexattr = fuse_removexattr,
Miklos Szeredie5e55582005-09-09 13:10:28 -07001591};
1592
Arjan van de Ven754661f2007-02-12 00:55:38 -08001593static const struct inode_operations fuse_symlink_inode_operations = {
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001594 .setattr = fuse_setattr,
Miklos Szeredie5e55582005-09-09 13:10:28 -07001595 .follow_link = fuse_follow_link,
1596 .put_link = fuse_put_link,
1597 .readlink = generic_readlink,
1598 .getattr = fuse_getattr,
Miklos Szeredi92a87802005-09-09 13:10:31 -07001599 .setxattr = fuse_setxattr,
1600 .getxattr = fuse_getxattr,
1601 .listxattr = fuse_listxattr,
1602 .removexattr = fuse_removexattr,
Miklos Szeredie5e55582005-09-09 13:10:28 -07001603};
1604
1605void fuse_init_common(struct inode *inode)
1606{
1607 inode->i_op = &fuse_common_inode_operations;
1608}
1609
1610void fuse_init_dir(struct inode *inode)
1611{
1612 inode->i_op = &fuse_dir_inode_operations;
1613 inode->i_fop = &fuse_dir_operations;
1614}
1615
1616void fuse_init_symlink(struct inode *inode)
1617{
1618 inode->i_op = &fuse_symlink_inode_operations;
1619}