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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
Miklos Szeredie7c0a162011-03-21 13:58:06 +0100161 inode = ACCESS_ONCE(entry->d_inode);
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -0800162 if (inode && is_bad_inode(inode))
Miklos Szeredie5e55582005-09-09 13:10:28 -0700163 return 0;
Miklos Szeredi0a0898c2006-07-30 03:04:10 -0700164 else if (fuse_dentry_time(entry) < get_jiffies_64()) {
Miklos Szeredie5e55582005-09-09 13:10:28 -0700165 int err;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700166 struct fuse_entry_out outarg;
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -0800167 struct fuse_conn *fc;
168 struct fuse_req *req;
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100169 struct fuse_forget_link *forget;
Miklos Szeredie956edd2006-10-17 00:10:12 -0700170 struct dentry *parent;
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700171 u64 attr_version;
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -0800172
Miklos Szeredi50322fe2006-02-28 16:59:03 -0800173 /* For negative dentries, always do a fresh lookup */
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -0800174 if (!inode)
175 return 0;
176
Miklos Szeredid2433902011-05-10 17:35:58 +0200177 if (nd && (nd->flags & LOOKUP_RCU))
Miklos Szeredie7c0a162011-03-21 13:58:06 +0100178 return -ECHILD;
179
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -0800180 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;
Al Viro8a5e9292011-06-25 19:15:54 -0400385 int flags = nd->intent.open.flags;
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800386
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
Al Viro1a67aaf2011-07-26 01:52:52 -0400550static int fuse_mknod(struct inode *dir, struct dentry *entry, umode_t mode,
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700551 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
Al Viro4acdaf22011-07-26 01:42:34 -0400576static int fuse_create(struct inode *dir, struct dentry *entry, umode_t mode,
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700577 struct nameidata *nd)
578{
Al Virodd7dd552011-06-25 21:17:17 -0400579 if (nd) {
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
Al Viro18bb1db2011-07-26 01:41:39 -0400588static int fuse_mkdir(struct inode *dir, struct dentry *entry, umode_t mode)
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700589{
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);
Sage Weile4eaac02011-05-24 13:06:07 -0700694
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700695 if (IS_ERR(req))
696 return PTR_ERR(req);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700697
698 memset(&inarg, 0, sizeof(inarg));
699 inarg.newdir = get_node_id(newdir);
700 req->in.h.opcode = FUSE_RENAME;
701 req->in.h.nodeid = get_node_id(olddir);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700702 req->in.numargs = 3;
703 req->in.args[0].size = sizeof(inarg);
704 req->in.args[0].value = &inarg;
705 req->in.args[1].size = oldent->d_name.len + 1;
706 req->in.args[1].value = oldent->d_name.name;
707 req->in.args[2].size = newent->d_name.len + 1;
708 req->in.args[2].value = newent->d_name.name;
Tejun Heob93f8582008-11-26 12:03:55 +0100709 fuse_request_send(fc, req);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700710 err = req->out.h.error;
711 fuse_put_request(fc, req);
712 if (!err) {
Miklos Szeredi08b63302007-11-28 16:22:03 -0800713 /* ctime changes */
714 fuse_invalidate_attr(oldent->d_inode);
715
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700716 fuse_invalidate_attr(olddir);
717 if (olddir != newdir)
718 fuse_invalidate_attr(newdir);
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -0800719
720 /* newent will end up negative */
Miklos Szeredi5219f342009-11-04 10:24:52 +0100721 if (newent->d_inode) {
722 fuse_invalidate_attr(newent->d_inode);
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -0800723 fuse_invalidate_entry_cache(newent);
Miklos Szeredi5219f342009-11-04 10:24:52 +0100724 }
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700725 } else if (err == -EINTR) {
726 /* If request was interrupted, DEITY only knows if the
727 rename actually took place. If the invalidation
728 fails (e.g. some process has CWD under the renamed
729 directory), then there can be inconsistency between
730 the dcache and the real filesystem. Tough luck. */
731 fuse_invalidate_entry(oldent);
732 if (newent->d_inode)
733 fuse_invalidate_entry(newent);
734 }
735
736 return err;
737}
738
739static int fuse_link(struct dentry *entry, struct inode *newdir,
740 struct dentry *newent)
741{
742 int err;
743 struct fuse_link_in inarg;
744 struct inode *inode = entry->d_inode;
745 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700746 struct fuse_req *req = fuse_get_req(fc);
747 if (IS_ERR(req))
748 return PTR_ERR(req);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700749
750 memset(&inarg, 0, sizeof(inarg));
751 inarg.oldnodeid = get_node_id(inode);
752 req->in.h.opcode = FUSE_LINK;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700753 req->in.numargs = 2;
754 req->in.args[0].size = sizeof(inarg);
755 req->in.args[0].value = &inarg;
756 req->in.args[1].size = newent->d_name.len + 1;
757 req->in.args[1].value = newent->d_name.name;
758 err = create_new_entry(fc, req, newdir, newent, inode->i_mode);
759 /* Contrary to "normal" filesystems it can happen that link
760 makes two "logical" inodes point to the same "physical"
761 inode. We invalidate the attributes of the old one, so it
762 will reflect changes in the backing inode (link count,
763 etc.)
764 */
765 if (!err || err == -EINTR)
766 fuse_invalidate_attr(inode);
767 return err;
768}
769
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700770static void fuse_fillattr(struct inode *inode, struct fuse_attr *attr,
771 struct kstat *stat)
772{
773 stat->dev = inode->i_sb->s_dev;
774 stat->ino = attr->ino;
775 stat->mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777);
776 stat->nlink = attr->nlink;
777 stat->uid = attr->uid;
778 stat->gid = attr->gid;
779 stat->rdev = inode->i_rdev;
780 stat->atime.tv_sec = attr->atime;
781 stat->atime.tv_nsec = attr->atimensec;
782 stat->mtime.tv_sec = attr->mtime;
783 stat->mtime.tv_nsec = attr->mtimensec;
784 stat->ctime.tv_sec = attr->ctime;
785 stat->ctime.tv_nsec = attr->ctimensec;
786 stat->size = attr->size;
787 stat->blocks = attr->blocks;
788 stat->blksize = (1 << inode->i_blkbits);
789}
790
Miklos Szeredic79e3222007-10-18 03:06:59 -0700791static int fuse_do_getattr(struct inode *inode, struct kstat *stat,
792 struct file *file)
Miklos Szeredie5e55582005-09-09 13:10:28 -0700793{
794 int err;
Miklos Szeredic79e3222007-10-18 03:06:59 -0700795 struct fuse_getattr_in inarg;
796 struct fuse_attr_out outarg;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700797 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700798 struct fuse_req *req;
799 u64 attr_version;
800
801 req = fuse_get_req(fc);
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700802 if (IS_ERR(req))
803 return PTR_ERR(req);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700804
Miklos Szeredi7dca9fd2007-11-28 16:21:59 -0800805 attr_version = fuse_get_attr_version(fc);
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700806
Miklos Szeredic79e3222007-10-18 03:06:59 -0700807 memset(&inarg, 0, sizeof(inarg));
Miklos Szeredi0e9663e2007-10-18 03:07:05 -0700808 memset(&outarg, 0, sizeof(outarg));
Miklos Szeredic79e3222007-10-18 03:06:59 -0700809 /* Directories have separate file-handle space */
810 if (file && S_ISREG(inode->i_mode)) {
811 struct fuse_file *ff = file->private_data;
812
813 inarg.getattr_flags |= FUSE_GETATTR_FH;
814 inarg.fh = ff->fh;
815 }
Miklos Szeredie5e55582005-09-09 13:10:28 -0700816 req->in.h.opcode = FUSE_GETATTR;
817 req->in.h.nodeid = get_node_id(inode);
Miklos Szeredic79e3222007-10-18 03:06:59 -0700818 req->in.numargs = 1;
819 req->in.args[0].size = sizeof(inarg);
820 req->in.args[0].value = &inarg;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700821 req->out.numargs = 1;
Miklos Szeredi0e9663e2007-10-18 03:07:05 -0700822 if (fc->minor < 9)
823 req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE;
824 else
825 req->out.args[0].size = sizeof(outarg);
Miklos Szeredic79e3222007-10-18 03:06:59 -0700826 req->out.args[0].value = &outarg;
Tejun Heob93f8582008-11-26 12:03:55 +0100827 fuse_request_send(fc, req);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700828 err = req->out.h.error;
829 fuse_put_request(fc, req);
830 if (!err) {
Miklos Szeredic79e3222007-10-18 03:06:59 -0700831 if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) {
Miklos Szeredie5e55582005-09-09 13:10:28 -0700832 make_bad_inode(inode);
833 err = -EIO;
834 } else {
Miklos Szeredic79e3222007-10-18 03:06:59 -0700835 fuse_change_attributes(inode, &outarg.attr,
836 attr_timeout(&outarg),
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700837 attr_version);
838 if (stat)
Miklos Szeredic79e3222007-10-18 03:06:59 -0700839 fuse_fillattr(inode, &outarg.attr, stat);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700840 }
841 }
842 return err;
843}
844
Miklos Szeredibcb4be82007-11-28 16:21:59 -0800845int fuse_update_attributes(struct inode *inode, struct kstat *stat,
846 struct file *file, bool *refreshed)
847{
848 struct fuse_inode *fi = get_fuse_inode(inode);
849 int err;
850 bool r;
851
852 if (fi->i_time < get_jiffies_64()) {
853 r = true;
854 err = fuse_do_getattr(inode, stat, file);
855 } else {
856 r = false;
857 err = 0;
858 if (stat) {
859 generic_fillattr(inode, stat);
860 stat->mode = fi->orig_i_mode;
861 }
862 }
863
864 if (refreshed != NULL)
865 *refreshed = r;
866
867 return err;
868}
869
John Muir3b463ae2009-05-31 11:13:57 -0400870int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid,
871 struct qstr *name)
872{
873 int err = -ENOTDIR;
874 struct inode *parent;
875 struct dentry *dir;
876 struct dentry *entry;
877
878 parent = ilookup5(sb, parent_nodeid, fuse_inode_eq, &parent_nodeid);
879 if (!parent)
880 return -ENOENT;
881
882 mutex_lock(&parent->i_mutex);
883 if (!S_ISDIR(parent->i_mode))
884 goto unlock;
885
886 err = -ENOENT;
887 dir = d_find_alias(parent);
888 if (!dir)
889 goto unlock;
890
891 entry = d_lookup(dir, name);
892 dput(dir);
893 if (!entry)
894 goto unlock;
895
896 fuse_invalidate_attr(parent);
897 fuse_invalidate_entry(entry);
898 dput(entry);
899 err = 0;
900
901 unlock:
902 mutex_unlock(&parent->i_mutex);
903 iput(parent);
904 return err;
905}
906
Miklos Szeredi87729a52005-09-09 13:10:34 -0700907/*
908 * Calling into a user-controlled filesystem gives the filesystem
909 * daemon ptrace-like capabilities over the requester process. This
910 * means, that the filesystem daemon is able to record the exact
911 * filesystem operations performed, and can also control the behavior
912 * of the requester process in otherwise impossible ways. For example
913 * it can delay the operation for arbitrary length of time allowing
914 * DoS against the requester.
915 *
916 * For this reason only those processes can call into the filesystem,
917 * for which the owner of the mount has ptrace privilege. This
918 * excludes processes started by other users, suid or sgid processes.
919 */
Miklos Szeredie57ac682007-10-18 03:06:58 -0700920int fuse_allow_task(struct fuse_conn *fc, struct task_struct *task)
Miklos Szeredi87729a52005-09-09 13:10:34 -0700921{
David Howellsc69e8d92008-11-14 10:39:19 +1100922 const struct cred *cred;
923 int ret;
924
Miklos Szeredi87729a52005-09-09 13:10:34 -0700925 if (fc->flags & FUSE_ALLOW_OTHER)
926 return 1;
927
David Howellsc69e8d92008-11-14 10:39:19 +1100928 rcu_read_lock();
929 ret = 0;
930 cred = __task_cred(task);
931 if (cred->euid == fc->user_id &&
932 cred->suid == fc->user_id &&
933 cred->uid == fc->user_id &&
934 cred->egid == fc->group_id &&
935 cred->sgid == fc->group_id &&
936 cred->gid == fc->group_id)
937 ret = 1;
938 rcu_read_unlock();
Miklos Szeredi87729a52005-09-09 13:10:34 -0700939
David Howellsc69e8d92008-11-14 10:39:19 +1100940 return ret;
Miklos Szeredi87729a52005-09-09 13:10:34 -0700941}
942
Miklos Szeredi31d40d72005-11-07 00:59:50 -0800943static int fuse_access(struct inode *inode, int mask)
944{
945 struct fuse_conn *fc = get_fuse_conn(inode);
946 struct fuse_req *req;
947 struct fuse_access_in inarg;
948 int err;
949
950 if (fc->no_access)
951 return 0;
952
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700953 req = fuse_get_req(fc);
954 if (IS_ERR(req))
955 return PTR_ERR(req);
Miklos Szeredi31d40d72005-11-07 00:59:50 -0800956
957 memset(&inarg, 0, sizeof(inarg));
Al Viroe6305c42008-07-15 21:03:57 -0400958 inarg.mask = mask & (MAY_READ | MAY_WRITE | MAY_EXEC);
Miklos Szeredi31d40d72005-11-07 00:59:50 -0800959 req->in.h.opcode = FUSE_ACCESS;
960 req->in.h.nodeid = get_node_id(inode);
Miklos Szeredi31d40d72005-11-07 00:59:50 -0800961 req->in.numargs = 1;
962 req->in.args[0].size = sizeof(inarg);
963 req->in.args[0].value = &inarg;
Tejun Heob93f8582008-11-26 12:03:55 +0100964 fuse_request_send(fc, req);
Miklos Szeredi31d40d72005-11-07 00:59:50 -0800965 err = req->out.h.error;
966 fuse_put_request(fc, req);
967 if (err == -ENOSYS) {
968 fc->no_access = 1;
969 err = 0;
970 }
971 return err;
972}
973
Al Viro10556cb2011-06-20 19:28:19 -0400974static int fuse_perm_getattr(struct inode *inode, int mask)
Miklos Szeredi19690dd2011-03-21 13:58:06 +0100975{
Al Viro10556cb2011-06-20 19:28:19 -0400976 if (mask & MAY_NOT_BLOCK)
Miklos Szeredi19690dd2011-03-21 13:58:06 +0100977 return -ECHILD;
978
979 return fuse_do_getattr(inode, NULL, NULL);
980}
981
Miklos Szeredi6f9f1182006-01-06 00:19:39 -0800982/*
983 * Check permission. The two basic access models of FUSE are:
984 *
985 * 1) Local access checking ('default_permissions' mount option) based
986 * on file mode. This is the plain old disk filesystem permission
987 * modell.
988 *
989 * 2) "Remote" access checking, where server is responsible for
990 * checking permission in each inode operation. An exception to this
991 * is if ->permission() was invoked from sys_access() in which case an
992 * access request is sent. Execute permission is still checked
993 * locally based on file mode.
994 */
Al Viro10556cb2011-06-20 19:28:19 -0400995static int fuse_permission(struct inode *inode, int mask)
Miklos Szeredie5e55582005-09-09 13:10:28 -0700996{
997 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredi244f6382007-10-16 23:31:02 -0700998 bool refreshed = false;
999 int err = 0;
Miklos Szeredie5e55582005-09-09 13:10:28 -07001000
Miklos Szeredi87729a52005-09-09 13:10:34 -07001001 if (!fuse_allow_task(fc, current))
Miklos Szeredie5e55582005-09-09 13:10:28 -07001002 return -EACCES;
Miklos Szeredi244f6382007-10-16 23:31:02 -07001003
1004 /*
Miklos Szeredie8e96152007-10-16 23:31:06 -07001005 * If attributes are needed, refresh them before proceeding
Miklos Szeredi244f6382007-10-16 23:31:02 -07001006 */
Miklos Szeredie8e96152007-10-16 23:31:06 -07001007 if ((fc->flags & FUSE_DEFAULT_PERMISSIONS) ||
1008 ((mask & MAY_EXEC) && S_ISREG(inode->i_mode))) {
Miklos Szeredi19690dd2011-03-21 13:58:06 +01001009 struct fuse_inode *fi = get_fuse_inode(inode);
1010
1011 if (fi->i_time < get_jiffies_64()) {
1012 refreshed = true;
1013
Al Viro10556cb2011-06-20 19:28:19 -04001014 err = fuse_perm_getattr(inode, mask);
Miklos Szeredi19690dd2011-03-21 13:58:06 +01001015 if (err)
1016 return err;
1017 }
Miklos Szeredi244f6382007-10-16 23:31:02 -07001018 }
1019
1020 if (fc->flags & FUSE_DEFAULT_PERMISSIONS) {
Al Viro2830ba72011-06-20 19:16:29 -04001021 err = generic_permission(inode, mask);
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -07001022
1023 /* If permission is denied, try to refresh file
1024 attributes. This is also needed, because the root
1025 node will at first have no permissions */
Miklos Szeredi244f6382007-10-16 23:31:02 -07001026 if (err == -EACCES && !refreshed) {
Al Viro10556cb2011-06-20 19:28:19 -04001027 err = fuse_perm_getattr(inode, mask);
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -07001028 if (!err)
Al Viro2830ba72011-06-20 19:16:29 -04001029 err = generic_permission(inode, mask);
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -07001030 }
1031
Miklos Szeredi6f9f1182006-01-06 00:19:39 -08001032 /* Note: the opposite of the above test does not
1033 exist. So if permissions are revoked this won't be
1034 noticed immediately, only after the attribute
1035 timeout has expired */
Eric Paris9cfcac82010-07-23 11:43:51 -04001036 } else if (mask & (MAY_ACCESS | MAY_CHDIR)) {
Al Viro10556cb2011-06-20 19:28:19 -04001037 if (mask & MAY_NOT_BLOCK)
Miklos Szeredi19690dd2011-03-21 13:58:06 +01001038 return -ECHILD;
1039
Miklos Szeredie8e96152007-10-16 23:31:06 -07001040 err = fuse_access(inode, mask);
1041 } else if ((mask & MAY_EXEC) && S_ISREG(inode->i_mode)) {
1042 if (!(inode->i_mode & S_IXUGO)) {
1043 if (refreshed)
1044 return -EACCES;
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -07001045
Al Viro10556cb2011-06-20 19:28:19 -04001046 err = fuse_perm_getattr(inode, mask);
Miklos Szeredie8e96152007-10-16 23:31:06 -07001047 if (!err && !(inode->i_mode & S_IXUGO))
1048 return -EACCES;
1049 }
Miklos Szeredie5e55582005-09-09 13:10:28 -07001050 }
Miklos Szeredi244f6382007-10-16 23:31:02 -07001051 return err;
Miklos Szeredie5e55582005-09-09 13:10:28 -07001052}
1053
1054static int parse_dirfile(char *buf, size_t nbytes, struct file *file,
1055 void *dstbuf, filldir_t filldir)
1056{
1057 while (nbytes >= FUSE_NAME_OFFSET) {
1058 struct fuse_dirent *dirent = (struct fuse_dirent *) buf;
1059 size_t reclen = FUSE_DIRENT_SIZE(dirent);
1060 int over;
1061 if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX)
1062 return -EIO;
1063 if (reclen > nbytes)
1064 break;
1065
1066 over = filldir(dstbuf, dirent->name, dirent->namelen,
1067 file->f_pos, dirent->ino, dirent->type);
1068 if (over)
1069 break;
1070
1071 buf += reclen;
1072 nbytes -= reclen;
1073 file->f_pos = dirent->off;
1074 }
1075
1076 return 0;
1077}
1078
Miklos Szeredie5e55582005-09-09 13:10:28 -07001079static int fuse_readdir(struct file *file, void *dstbuf, filldir_t filldir)
1080{
Miklos Szeredi04730fe2005-09-09 13:10:36 -07001081 int err;
1082 size_t nbytes;
1083 struct page *page;
Josef Sipek7706a9d2006-12-08 02:37:02 -08001084 struct inode *inode = file->f_path.dentry->d_inode;
Miklos Szeredi04730fe2005-09-09 13:10:36 -07001085 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredi248d86e2006-01-06 00:19:39 -08001086 struct fuse_req *req;
1087
1088 if (is_bad_inode(inode))
1089 return -EIO;
1090
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001091 req = fuse_get_req(fc);
1092 if (IS_ERR(req))
1093 return PTR_ERR(req);
Miklos Szeredie5e55582005-09-09 13:10:28 -07001094
Miklos Szeredi04730fe2005-09-09 13:10:36 -07001095 page = alloc_page(GFP_KERNEL);
1096 if (!page) {
1097 fuse_put_request(fc, req);
Miklos Szeredie5e55582005-09-09 13:10:28 -07001098 return -ENOMEM;
Miklos Szeredi04730fe2005-09-09 13:10:36 -07001099 }
Miklos Szeredif4975c62009-04-02 14:25:34 +02001100 req->out.argpages = 1;
Miklos Szeredi04730fe2005-09-09 13:10:36 -07001101 req->num_pages = 1;
1102 req->pages[0] = page;
Miklos Szeredi2106cb12009-04-28 16:56:37 +02001103 fuse_read_fill(req, file, file->f_pos, PAGE_SIZE, FUSE_READDIR);
Tejun Heob93f8582008-11-26 12:03:55 +01001104 fuse_request_send(fc, req);
Miklos Szeredi361b1eb52006-01-16 22:14:45 -08001105 nbytes = req->out.args[0].size;
Miklos Szeredi04730fe2005-09-09 13:10:36 -07001106 err = req->out.h.error;
1107 fuse_put_request(fc, req);
1108 if (!err)
1109 err = parse_dirfile(page_address(page), nbytes, file, dstbuf,
1110 filldir);
Miklos Szeredie5e55582005-09-09 13:10:28 -07001111
Miklos Szeredi04730fe2005-09-09 13:10:36 -07001112 __free_page(page);
Miklos Szeredib36c31b2005-09-09 13:10:38 -07001113 fuse_invalidate_attr(inode); /* atime changed */
Miklos Szeredi04730fe2005-09-09 13:10:36 -07001114 return err;
Miklos Szeredie5e55582005-09-09 13:10:28 -07001115}
1116
1117static char *read_link(struct dentry *dentry)
1118{
1119 struct inode *inode = dentry->d_inode;
1120 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001121 struct fuse_req *req = fuse_get_req(fc);
Miklos Szeredie5e55582005-09-09 13:10:28 -07001122 char *link;
1123
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001124 if (IS_ERR(req))
David Howellse231c2e2008-02-07 00:15:26 -08001125 return ERR_CAST(req);
Miklos Szeredie5e55582005-09-09 13:10:28 -07001126
1127 link = (char *) __get_free_page(GFP_KERNEL);
1128 if (!link) {
1129 link = ERR_PTR(-ENOMEM);
1130 goto out;
1131 }
1132 req->in.h.opcode = FUSE_READLINK;
1133 req->in.h.nodeid = get_node_id(inode);
Miklos Szeredie5e55582005-09-09 13:10:28 -07001134 req->out.argvar = 1;
1135 req->out.numargs = 1;
1136 req->out.args[0].size = PAGE_SIZE - 1;
1137 req->out.args[0].value = link;
Tejun Heob93f8582008-11-26 12:03:55 +01001138 fuse_request_send(fc, req);
Miklos Szeredie5e55582005-09-09 13:10:28 -07001139 if (req->out.h.error) {
1140 free_page((unsigned long) link);
1141 link = ERR_PTR(req->out.h.error);
1142 } else
1143 link[req->out.args[0].size] = '\0';
1144 out:
1145 fuse_put_request(fc, req);
Miklos Szeredib36c31b2005-09-09 13:10:38 -07001146 fuse_invalidate_attr(inode); /* atime changed */
Miklos Szeredie5e55582005-09-09 13:10:28 -07001147 return link;
1148}
1149
1150static void free_link(char *link)
1151{
1152 if (!IS_ERR(link))
1153 free_page((unsigned long) link);
1154}
1155
1156static void *fuse_follow_link(struct dentry *dentry, struct nameidata *nd)
1157{
1158 nd_set_link(nd, read_link(dentry));
1159 return NULL;
1160}
1161
1162static void fuse_put_link(struct dentry *dentry, struct nameidata *nd, void *c)
1163{
1164 free_link(nd_get_link(nd));
1165}
1166
1167static int fuse_dir_open(struct inode *inode, struct file *file)
1168{
Miklos Szeredi91fe96b2009-04-28 16:56:37 +02001169 return fuse_open_common(inode, file, true);
Miklos Szeredie5e55582005-09-09 13:10:28 -07001170}
1171
1172static int fuse_dir_release(struct inode *inode, struct file *file)
1173{
Miklos Szeredi8b0797a2009-04-28 16:56:39 +02001174 fuse_release_common(file, FUSE_RELEASEDIR);
1175
1176 return 0;
Miklos Szeredie5e55582005-09-09 13:10:28 -07001177}
1178
Josef Bacik02c24a82011-07-16 20:44:56 -04001179static int fuse_dir_fsync(struct file *file, loff_t start, loff_t end,
1180 int datasync)
Miklos Szeredi82547982005-09-09 13:10:38 -07001181{
Josef Bacik02c24a82011-07-16 20:44:56 -04001182 return fuse_fsync_common(file, start, end, datasync, 1);
Miklos Szeredi82547982005-09-09 13:10:38 -07001183}
1184
Miklos Szeredi17637cb2007-10-18 03:07:01 -07001185static bool update_mtime(unsigned ivalid)
1186{
1187 /* Always update if mtime is explicitly set */
1188 if (ivalid & ATTR_MTIME_SET)
1189 return true;
1190
1191 /* If it's an open(O_TRUNC) or an ftruncate(), don't update */
1192 if ((ivalid & ATTR_SIZE) && (ivalid & (ATTR_OPEN | ATTR_FILE)))
1193 return false;
1194
1195 /* In all other cases update */
1196 return true;
1197}
1198
Miklos Szeredibefc6492005-11-07 00:59:52 -08001199static void iattr_to_fattr(struct iattr *iattr, struct fuse_setattr_in *arg)
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001200{
1201 unsigned ivalid = iattr->ia_valid;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001202
1203 if (ivalid & ATTR_MODE)
Miklos Szeredibefc6492005-11-07 00:59:52 -08001204 arg->valid |= FATTR_MODE, arg->mode = iattr->ia_mode;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001205 if (ivalid & ATTR_UID)
Miklos Szeredibefc6492005-11-07 00:59:52 -08001206 arg->valid |= FATTR_UID, arg->uid = iattr->ia_uid;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001207 if (ivalid & ATTR_GID)
Miklos Szeredibefc6492005-11-07 00:59:52 -08001208 arg->valid |= FATTR_GID, arg->gid = iattr->ia_gid;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001209 if (ivalid & ATTR_SIZE)
Miklos Szeredibefc6492005-11-07 00:59:52 -08001210 arg->valid |= FATTR_SIZE, arg->size = iattr->ia_size;
Miklos Szeredi17637cb2007-10-18 03:07:01 -07001211 if (ivalid & ATTR_ATIME) {
1212 arg->valid |= FATTR_ATIME;
Miklos Szeredibefc6492005-11-07 00:59:52 -08001213 arg->atime = iattr->ia_atime.tv_sec;
Miklos Szeredi17637cb2007-10-18 03:07:01 -07001214 arg->atimensec = iattr->ia_atime.tv_nsec;
1215 if (!(ivalid & ATTR_ATIME_SET))
1216 arg->valid |= FATTR_ATIME_NOW;
1217 }
1218 if ((ivalid & ATTR_MTIME) && update_mtime(ivalid)) {
1219 arg->valid |= FATTR_MTIME;
Miklos Szeredibefc6492005-11-07 00:59:52 -08001220 arg->mtime = iattr->ia_mtime.tv_sec;
Miklos Szeredi17637cb2007-10-18 03:07:01 -07001221 arg->mtimensec = iattr->ia_mtime.tv_nsec;
1222 if (!(ivalid & ATTR_MTIME_SET))
1223 arg->valid |= FATTR_MTIME_NOW;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001224 }
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001225}
1226
Miklos Szeredi6f9f1182006-01-06 00:19:39 -08001227/*
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001228 * Prevent concurrent writepages on inode
1229 *
1230 * This is done by adding a negative bias to the inode write counter
1231 * and waiting for all pending writes to finish.
1232 */
1233void fuse_set_nowrite(struct inode *inode)
1234{
1235 struct fuse_conn *fc = get_fuse_conn(inode);
1236 struct fuse_inode *fi = get_fuse_inode(inode);
1237
1238 BUG_ON(!mutex_is_locked(&inode->i_mutex));
1239
1240 spin_lock(&fc->lock);
1241 BUG_ON(fi->writectr < 0);
1242 fi->writectr += FUSE_NOWRITE;
1243 spin_unlock(&fc->lock);
1244 wait_event(fi->page_waitq, fi->writectr == FUSE_NOWRITE);
1245}
1246
1247/*
1248 * Allow writepages on inode
1249 *
1250 * Remove the bias from the writecounter and send any queued
1251 * writepages.
1252 */
1253static void __fuse_release_nowrite(struct inode *inode)
1254{
1255 struct fuse_inode *fi = get_fuse_inode(inode);
1256
1257 BUG_ON(fi->writectr != FUSE_NOWRITE);
1258 fi->writectr = 0;
1259 fuse_flush_writepages(inode);
1260}
1261
1262void fuse_release_nowrite(struct inode *inode)
1263{
1264 struct fuse_conn *fc = get_fuse_conn(inode);
1265
1266 spin_lock(&fc->lock);
1267 __fuse_release_nowrite(inode);
1268 spin_unlock(&fc->lock);
1269}
1270
1271/*
Miklos Szeredi6f9f1182006-01-06 00:19:39 -08001272 * Set attributes, and at the same time refresh them.
1273 *
1274 * Truncation is slightly complicated, because the 'truncate' request
1275 * may fail, in which case we don't want to touch the mapping.
Miklos Szeredi9ffbb912006-10-17 00:10:06 -07001276 * vmtruncate() doesn't allow for this case, so do the rlimit checking
1277 * and the actual truncation by hand.
Miklos Szeredi6f9f1182006-01-06 00:19:39 -08001278 */
Miklos Szeredi49d49142007-10-18 03:07:00 -07001279static int fuse_do_setattr(struct dentry *entry, struct iattr *attr,
1280 struct file *file)
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001281{
1282 struct inode *inode = entry->d_inode;
1283 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001284 struct fuse_req *req;
1285 struct fuse_setattr_in inarg;
1286 struct fuse_attr_out outarg;
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001287 bool is_truncate = false;
1288 loff_t oldsize;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001289 int err;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001290
Miklos Szeredie57ac682007-10-18 03:06:58 -07001291 if (!fuse_allow_task(fc, current))
1292 return -EACCES;
1293
Christoph Hellwigdb78b872010-06-04 11:30:03 +02001294 if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS))
1295 attr->ia_valid |= ATTR_FORCE;
1296
1297 err = inode_change_ok(inode, attr);
1298 if (err)
1299 return err;
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -07001300
Miklos Szeredi8d56add2011-02-25 14:44:58 +01001301 if (attr->ia_valid & ATTR_OPEN) {
1302 if (fc->atomic_o_trunc)
1303 return 0;
1304 file = NULL;
1305 }
Miklos Szeredi6ff958e2007-10-18 03:07:02 -07001306
Christoph Hellwig2c27c652010-06-04 11:30:04 +02001307 if (attr->ia_valid & ATTR_SIZE)
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001308 is_truncate = true;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001309
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001310 req = fuse_get_req(fc);
1311 if (IS_ERR(req))
1312 return PTR_ERR(req);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001313
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001314 if (is_truncate)
1315 fuse_set_nowrite(inode);
1316
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001317 memset(&inarg, 0, sizeof(inarg));
Miklos Szeredi0e9663e2007-10-18 03:07:05 -07001318 memset(&outarg, 0, sizeof(outarg));
Miklos Szeredibefc6492005-11-07 00:59:52 -08001319 iattr_to_fattr(attr, &inarg);
Miklos Szeredi49d49142007-10-18 03:07:00 -07001320 if (file) {
1321 struct fuse_file *ff = file->private_data;
1322 inarg.valid |= FATTR_FH;
1323 inarg.fh = ff->fh;
1324 }
Miklos Szeredif3332112007-10-18 03:07:04 -07001325 if (attr->ia_valid & ATTR_SIZE) {
1326 /* For mandatory locking in truncate */
1327 inarg.valid |= FATTR_LOCKOWNER;
1328 inarg.lock_owner = fuse_lock_owner_id(fc, current->files);
1329 }
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001330 req->in.h.opcode = FUSE_SETATTR;
1331 req->in.h.nodeid = get_node_id(inode);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001332 req->in.numargs = 1;
1333 req->in.args[0].size = sizeof(inarg);
1334 req->in.args[0].value = &inarg;
1335 req->out.numargs = 1;
Miklos Szeredi0e9663e2007-10-18 03:07:05 -07001336 if (fc->minor < 9)
1337 req->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE;
1338 else
1339 req->out.args[0].size = sizeof(outarg);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001340 req->out.args[0].value = &outarg;
Tejun Heob93f8582008-11-26 12:03:55 +01001341 fuse_request_send(fc, req);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001342 err = req->out.h.error;
1343 fuse_put_request(fc, req);
Miklos Szeredie00d2c22007-10-16 23:31:01 -07001344 if (err) {
1345 if (err == -EINTR)
1346 fuse_invalidate_attr(inode);
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001347 goto error;
Miklos Szeredie00d2c22007-10-16 23:31:01 -07001348 }
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001349
Miklos Szeredie00d2c22007-10-16 23:31:01 -07001350 if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) {
1351 make_bad_inode(inode);
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001352 err = -EIO;
1353 goto error;
Miklos Szeredie00d2c22007-10-16 23:31:01 -07001354 }
1355
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001356 spin_lock(&fc->lock);
1357 fuse_change_attributes_common(inode, &outarg.attr,
1358 attr_timeout(&outarg));
1359 oldsize = inode->i_size;
1360 i_size_write(inode, outarg.attr.size);
1361
1362 if (is_truncate) {
1363 /* NOTE: this may release/reacquire fc->lock */
1364 __fuse_release_nowrite(inode);
1365 }
1366 spin_unlock(&fc->lock);
1367
1368 /*
1369 * Only call invalidate_inode_pages2() after removing
1370 * FUSE_NOWRITE, otherwise fuse_launder_page() would deadlock.
1371 */
1372 if (S_ISREG(inode->i_mode) && oldsize != outarg.attr.size) {
npiggin@suse.dec08d3b02009-08-21 02:35:06 +10001373 truncate_pagecache(inode, oldsize, outarg.attr.size);
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001374 invalidate_inode_pages2(inode->i_mapping);
1375 }
1376
Miklos Szeredie00d2c22007-10-16 23:31:01 -07001377 return 0;
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001378
1379error:
1380 if (is_truncate)
1381 fuse_release_nowrite(inode);
1382
1383 return err;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001384}
1385
Miklos Szeredi49d49142007-10-18 03:07:00 -07001386static int fuse_setattr(struct dentry *entry, struct iattr *attr)
1387{
1388 if (attr->ia_valid & ATTR_FILE)
1389 return fuse_do_setattr(entry, attr, attr->ia_file);
1390 else
1391 return fuse_do_setattr(entry, attr, NULL);
1392}
1393
Miklos Szeredie5e55582005-09-09 13:10:28 -07001394static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry,
1395 struct kstat *stat)
1396{
1397 struct inode *inode = entry->d_inode;
Miklos Szeredi244f6382007-10-16 23:31:02 -07001398 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredi244f6382007-10-16 23:31:02 -07001399
1400 if (!fuse_allow_task(fc, current))
1401 return -EACCES;
1402
Miklos Szeredibcb4be82007-11-28 16:21:59 -08001403 return fuse_update_attributes(inode, stat, NULL, NULL);
Miklos Szeredie5e55582005-09-09 13:10:28 -07001404}
1405
Miklos Szeredi92a87802005-09-09 13:10:31 -07001406static int fuse_setxattr(struct dentry *entry, const char *name,
1407 const void *value, size_t size, int flags)
1408{
1409 struct inode *inode = entry->d_inode;
1410 struct fuse_conn *fc = get_fuse_conn(inode);
1411 struct fuse_req *req;
1412 struct fuse_setxattr_in inarg;
1413 int err;
1414
Miklos Szeredi92a87802005-09-09 13:10:31 -07001415 if (fc->no_setxattr)
1416 return -EOPNOTSUPP;
1417
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001418 req = fuse_get_req(fc);
1419 if (IS_ERR(req))
1420 return PTR_ERR(req);
Miklos Szeredi92a87802005-09-09 13:10:31 -07001421
1422 memset(&inarg, 0, sizeof(inarg));
1423 inarg.size = size;
1424 inarg.flags = flags;
1425 req->in.h.opcode = FUSE_SETXATTR;
1426 req->in.h.nodeid = get_node_id(inode);
Miklos Szeredi92a87802005-09-09 13:10:31 -07001427 req->in.numargs = 3;
1428 req->in.args[0].size = sizeof(inarg);
1429 req->in.args[0].value = &inarg;
1430 req->in.args[1].size = strlen(name) + 1;
1431 req->in.args[1].value = name;
1432 req->in.args[2].size = size;
1433 req->in.args[2].value = value;
Tejun Heob93f8582008-11-26 12:03:55 +01001434 fuse_request_send(fc, req);
Miklos Szeredi92a87802005-09-09 13:10:31 -07001435 err = req->out.h.error;
1436 fuse_put_request(fc, req);
1437 if (err == -ENOSYS) {
1438 fc->no_setxattr = 1;
1439 err = -EOPNOTSUPP;
1440 }
1441 return err;
1442}
1443
1444static ssize_t fuse_getxattr(struct dentry *entry, const char *name,
1445 void *value, size_t size)
1446{
1447 struct inode *inode = entry->d_inode;
1448 struct fuse_conn *fc = get_fuse_conn(inode);
1449 struct fuse_req *req;
1450 struct fuse_getxattr_in inarg;
1451 struct fuse_getxattr_out outarg;
1452 ssize_t ret;
1453
1454 if (fc->no_getxattr)
1455 return -EOPNOTSUPP;
1456
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001457 req = fuse_get_req(fc);
1458 if (IS_ERR(req))
1459 return PTR_ERR(req);
Miklos Szeredi92a87802005-09-09 13:10:31 -07001460
1461 memset(&inarg, 0, sizeof(inarg));
1462 inarg.size = size;
1463 req->in.h.opcode = FUSE_GETXATTR;
1464 req->in.h.nodeid = get_node_id(inode);
Miklos Szeredi92a87802005-09-09 13:10:31 -07001465 req->in.numargs = 2;
1466 req->in.args[0].size = sizeof(inarg);
1467 req->in.args[0].value = &inarg;
1468 req->in.args[1].size = strlen(name) + 1;
1469 req->in.args[1].value = name;
1470 /* This is really two different operations rolled into one */
1471 req->out.numargs = 1;
1472 if (size) {
1473 req->out.argvar = 1;
1474 req->out.args[0].size = size;
1475 req->out.args[0].value = value;
1476 } else {
1477 req->out.args[0].size = sizeof(outarg);
1478 req->out.args[0].value = &outarg;
1479 }
Tejun Heob93f8582008-11-26 12:03:55 +01001480 fuse_request_send(fc, req);
Miklos Szeredi92a87802005-09-09 13:10:31 -07001481 ret = req->out.h.error;
1482 if (!ret)
1483 ret = size ? req->out.args[0].size : outarg.size;
1484 else {
1485 if (ret == -ENOSYS) {
1486 fc->no_getxattr = 1;
1487 ret = -EOPNOTSUPP;
1488 }
1489 }
1490 fuse_put_request(fc, req);
1491 return ret;
1492}
1493
1494static ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size)
1495{
1496 struct inode *inode = entry->d_inode;
1497 struct fuse_conn *fc = get_fuse_conn(inode);
1498 struct fuse_req *req;
1499 struct fuse_getxattr_in inarg;
1500 struct fuse_getxattr_out outarg;
1501 ssize_t ret;
1502
Miklos Szeredie57ac682007-10-18 03:06:58 -07001503 if (!fuse_allow_task(fc, current))
1504 return -EACCES;
1505
Miklos Szeredi92a87802005-09-09 13:10:31 -07001506 if (fc->no_listxattr)
1507 return -EOPNOTSUPP;
1508
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001509 req = fuse_get_req(fc);
1510 if (IS_ERR(req))
1511 return PTR_ERR(req);
Miklos Szeredi92a87802005-09-09 13:10:31 -07001512
1513 memset(&inarg, 0, sizeof(inarg));
1514 inarg.size = size;
1515 req->in.h.opcode = FUSE_LISTXATTR;
1516 req->in.h.nodeid = get_node_id(inode);
Miklos Szeredi92a87802005-09-09 13:10:31 -07001517 req->in.numargs = 1;
1518 req->in.args[0].size = sizeof(inarg);
1519 req->in.args[0].value = &inarg;
1520 /* This is really two different operations rolled into one */
1521 req->out.numargs = 1;
1522 if (size) {
1523 req->out.argvar = 1;
1524 req->out.args[0].size = size;
1525 req->out.args[0].value = list;
1526 } else {
1527 req->out.args[0].size = sizeof(outarg);
1528 req->out.args[0].value = &outarg;
1529 }
Tejun Heob93f8582008-11-26 12:03:55 +01001530 fuse_request_send(fc, req);
Miklos Szeredi92a87802005-09-09 13:10:31 -07001531 ret = req->out.h.error;
1532 if (!ret)
1533 ret = size ? req->out.args[0].size : outarg.size;
1534 else {
1535 if (ret == -ENOSYS) {
1536 fc->no_listxattr = 1;
1537 ret = -EOPNOTSUPP;
1538 }
1539 }
1540 fuse_put_request(fc, req);
1541 return ret;
1542}
1543
1544static int fuse_removexattr(struct dentry *entry, const char *name)
1545{
1546 struct inode *inode = entry->d_inode;
1547 struct fuse_conn *fc = get_fuse_conn(inode);
1548 struct fuse_req *req;
1549 int err;
1550
1551 if (fc->no_removexattr)
1552 return -EOPNOTSUPP;
1553
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001554 req = fuse_get_req(fc);
1555 if (IS_ERR(req))
1556 return PTR_ERR(req);
Miklos Szeredi92a87802005-09-09 13:10:31 -07001557
1558 req->in.h.opcode = FUSE_REMOVEXATTR;
1559 req->in.h.nodeid = get_node_id(inode);
Miklos Szeredi92a87802005-09-09 13:10:31 -07001560 req->in.numargs = 1;
1561 req->in.args[0].size = strlen(name) + 1;
1562 req->in.args[0].value = name;
Tejun Heob93f8582008-11-26 12:03:55 +01001563 fuse_request_send(fc, req);
Miklos Szeredi92a87802005-09-09 13:10:31 -07001564 err = req->out.h.error;
1565 fuse_put_request(fc, req);
1566 if (err == -ENOSYS) {
1567 fc->no_removexattr = 1;
1568 err = -EOPNOTSUPP;
1569 }
1570 return err;
1571}
1572
Arjan van de Ven754661f2007-02-12 00:55:38 -08001573static const struct inode_operations fuse_dir_inode_operations = {
Miklos Szeredie5e55582005-09-09 13:10:28 -07001574 .lookup = fuse_lookup,
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001575 .mkdir = fuse_mkdir,
1576 .symlink = fuse_symlink,
1577 .unlink = fuse_unlink,
1578 .rmdir = fuse_rmdir,
1579 .rename = fuse_rename,
1580 .link = fuse_link,
1581 .setattr = fuse_setattr,
1582 .create = fuse_create,
1583 .mknod = fuse_mknod,
Miklos Szeredie5e55582005-09-09 13:10:28 -07001584 .permission = fuse_permission,
1585 .getattr = fuse_getattr,
Miklos Szeredi92a87802005-09-09 13:10:31 -07001586 .setxattr = fuse_setxattr,
1587 .getxattr = fuse_getxattr,
1588 .listxattr = fuse_listxattr,
1589 .removexattr = fuse_removexattr,
Miklos Szeredie5e55582005-09-09 13:10:28 -07001590};
1591
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08001592static const struct file_operations fuse_dir_operations = {
Miklos Szeredib6aeade2005-09-09 13:10:30 -07001593 .llseek = generic_file_llseek,
Miklos Szeredie5e55582005-09-09 13:10:28 -07001594 .read = generic_read_dir,
1595 .readdir = fuse_readdir,
1596 .open = fuse_dir_open,
1597 .release = fuse_dir_release,
Miklos Szeredi82547982005-09-09 13:10:38 -07001598 .fsync = fuse_dir_fsync,
Miklos Szeredie5e55582005-09-09 13:10:28 -07001599};
1600
Arjan van de Ven754661f2007-02-12 00:55:38 -08001601static const struct inode_operations fuse_common_inode_operations = {
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001602 .setattr = fuse_setattr,
Miklos Szeredie5e55582005-09-09 13:10:28 -07001603 .permission = fuse_permission,
1604 .getattr = fuse_getattr,
Miklos Szeredi92a87802005-09-09 13:10:31 -07001605 .setxattr = fuse_setxattr,
1606 .getxattr = fuse_getxattr,
1607 .listxattr = fuse_listxattr,
1608 .removexattr = fuse_removexattr,
Miklos Szeredie5e55582005-09-09 13:10:28 -07001609};
1610
Arjan van de Ven754661f2007-02-12 00:55:38 -08001611static const struct inode_operations fuse_symlink_inode_operations = {
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001612 .setattr = fuse_setattr,
Miklos Szeredie5e55582005-09-09 13:10:28 -07001613 .follow_link = fuse_follow_link,
1614 .put_link = fuse_put_link,
1615 .readlink = generic_readlink,
1616 .getattr = fuse_getattr,
Miklos Szeredi92a87802005-09-09 13:10:31 -07001617 .setxattr = fuse_setxattr,
1618 .getxattr = fuse_getxattr,
1619 .listxattr = fuse_listxattr,
1620 .removexattr = fuse_removexattr,
Miklos Szeredie5e55582005-09-09 13:10:28 -07001621};
1622
1623void fuse_init_common(struct inode *inode)
1624{
1625 inode->i_op = &fuse_common_inode_operations;
1626}
1627
1628void fuse_init_dir(struct inode *inode)
1629{
1630 inode->i_op = &fuse_dir_inode_operations;
1631 inode->i_fop = &fuse_dir_operations;
1632}
1633
1634void fuse_init_symlink(struct inode *inode)
1635{
1636 inode->i_op = &fuse_symlink_inode_operations;
1637}