blob: 5e2e08712d3ba614a46687d5688fc2f01cd835be [file] [log] [blame]
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
Al Viro8d3af7f2013-05-18 03:03:58 -040017static bool fuse_use_readdirplus(struct inode *dir, struct dir_context *ctx)
Feng Shuo4582a4a2013-01-15 11:23:28 +080018{
19 struct fuse_conn *fc = get_fuse_conn(dir);
20 struct fuse_inode *fi = get_fuse_inode(dir);
21
22 if (!fc->do_readdirplus)
23 return false;
Eric Wong634734b2013-02-06 22:29:01 +000024 if (!fc->readdirplus_auto)
25 return true;
Feng Shuo4582a4a2013-01-15 11:23:28 +080026 if (test_and_clear_bit(FUSE_I_ADVISE_RDPLUS, &fi->state))
27 return true;
Al Viro8d3af7f2013-05-18 03:03:58 -040028 if (ctx->pos == 0)
Feng Shuo4582a4a2013-01-15 11:23:28 +080029 return true;
30 return false;
31}
32
33static void fuse_advise_use_readdirplus(struct inode *dir)
34{
35 struct fuse_inode *fi = get_fuse_inode(dir);
36
37 set_bit(FUSE_I_ADVISE_RDPLUS, &fi->state);
38}
39
Miklos Szeredi0a0898c2006-07-30 03:04:10 -070040#if BITS_PER_LONG >= 64
41static inline void fuse_dentry_settime(struct dentry *entry, u64 time)
42{
43 entry->d_time = time;
44}
45
46static inline u64 fuse_dentry_time(struct dentry *entry)
47{
48 return entry->d_time;
49}
50#else
51/*
52 * On 32 bit archs store the high 32 bits of time in d_fsdata
53 */
54static void fuse_dentry_settime(struct dentry *entry, u64 time)
55{
56 entry->d_time = time;
57 entry->d_fsdata = (void *) (unsigned long) (time >> 32);
58}
59
60static u64 fuse_dentry_time(struct dentry *entry)
61{
62 return (u64) entry->d_time +
63 ((u64) (unsigned long) entry->d_fsdata << 32);
64}
65#endif
66
Miklos Szeredi6f9f1182006-01-06 00:19:39 -080067/*
68 * FUSE caches dentries and attributes with separate timeout. The
69 * time in jiffies until the dentry/attributes are valid is stored in
70 * dentry->d_time and fuse_inode->i_time respectively.
71 */
72
73/*
74 * Calculate the time in jiffies until a dentry/attributes are valid
75 */
Miklos Szeredi0a0898c2006-07-30 03:04:10 -070076static u64 time_to_jiffies(unsigned long sec, unsigned long nsec)
Miklos Szeredie5e55582005-09-09 13:10:28 -070077{
Miklos Szeredi685d16d2006-07-30 03:04:08 -070078 if (sec || nsec) {
79 struct timespec ts = {sec, nsec};
Miklos Szeredi0a0898c2006-07-30 03:04:10 -070080 return get_jiffies_64() + timespec_to_jiffies(&ts);
Miklos Szeredi685d16d2006-07-30 03:04:08 -070081 } else
Miklos Szeredi0a0898c2006-07-30 03:04:10 -070082 return 0;
Miklos Szeredie5e55582005-09-09 13:10:28 -070083}
84
Miklos Szeredi6f9f1182006-01-06 00:19:39 -080085/*
86 * Set dentry and possibly attribute timeouts from the lookup/mk*
87 * replies
88 */
Miklos Szeredi1fb69e72007-10-18 03:06:58 -070089static void fuse_change_entry_timeout(struct dentry *entry,
90 struct fuse_entry_out *o)
Miklos Szeredi0aa7c692006-01-06 00:19:34 -080091{
Miklos Szeredi0a0898c2006-07-30 03:04:10 -070092 fuse_dentry_settime(entry,
93 time_to_jiffies(o->entry_valid, o->entry_valid_nsec));
Miklos Szeredi1fb69e72007-10-18 03:06:58 -070094}
95
96static u64 attr_timeout(struct fuse_attr_out *o)
97{
98 return time_to_jiffies(o->attr_valid, o->attr_valid_nsec);
99}
100
101static u64 entry_attr_timeout(struct fuse_entry_out *o)
102{
103 return time_to_jiffies(o->attr_valid, o->attr_valid_nsec);
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -0800104}
105
Miklos Szeredi6f9f1182006-01-06 00:19:39 -0800106/*
107 * Mark the attributes as stale, so that at the next call to
108 * ->getattr() they will be fetched from userspace
109 */
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -0800110void fuse_invalidate_attr(struct inode *inode)
111{
Miklos Szeredi0a0898c2006-07-30 03:04:10 -0700112 get_fuse_inode(inode)->i_time = 0;
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -0800113}
114
Andrew Gallagher451418f2013-11-05 03:55:43 -0800115/**
116 * Mark the attributes as stale due to an atime change. Avoid the invalidate if
117 * atime is not used.
118 */
119void fuse_invalidate_atime(struct inode *inode)
120{
121 if (!IS_RDONLY(inode))
122 fuse_invalidate_attr(inode);
123}
124
Miklos Szeredi6f9f1182006-01-06 00:19:39 -0800125/*
126 * Just mark the entry as stale, so that a next attempt to look it up
127 * will result in a new lookup call to userspace
128 *
129 * This is called when a dentry is about to become negative and the
130 * timeout is unknown (unlink, rmdir, rename and in some cases
131 * lookup)
132 */
Miklos Szeredidbd561d2008-07-25 01:49:00 -0700133void fuse_invalidate_entry_cache(struct dentry *entry)
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -0800134{
Miklos Szeredi0a0898c2006-07-30 03:04:10 -0700135 fuse_dentry_settime(entry, 0);
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -0800136}
137
Miklos Szeredi6f9f1182006-01-06 00:19:39 -0800138/*
139 * Same as fuse_invalidate_entry_cache(), but also try to remove the
140 * dentry from the hash
141 */
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -0800142static void fuse_invalidate_entry(struct dentry *entry)
143{
144 d_invalidate(entry);
145 fuse_invalidate_entry_cache(entry);
Miklos Szeredi0aa7c692006-01-06 00:19:34 -0800146}
147
Miklos Szeredi70781872014-12-12 09:49:05 +0100148static void fuse_lookup_init(struct fuse_conn *fc, struct fuse_args *args,
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700149 u64 nodeid, struct qstr *name,
Miklos Szeredie5e55582005-09-09 13:10:28 -0700150 struct fuse_entry_out *outarg)
151{
Miklos Szeredi0e9663e2007-10-18 03:07:05 -0700152 memset(outarg, 0, sizeof(struct fuse_entry_out));
Miklos Szeredi70781872014-12-12 09:49:05 +0100153 args->in.h.opcode = FUSE_LOOKUP;
154 args->in.h.nodeid = nodeid;
155 args->in.numargs = 1;
156 args->in.args[0].size = name->len + 1;
157 args->in.args[0].value = name->name;
158 args->out.numargs = 1;
Miklos Szeredi21f62172015-01-06 10:45:35 +0100159 args->out.args[0].size = sizeof(struct fuse_entry_out);
Miklos Szeredi70781872014-12-12 09:49:05 +0100160 args->out.args[0].value = outarg;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700161}
162
Miklos Szeredi5c5c5e52008-04-30 00:54:43 -0700163u64 fuse_get_attr_version(struct fuse_conn *fc)
Miklos Szeredi7dca9fd2007-11-28 16:21:59 -0800164{
165 u64 curr_version;
166
167 /*
168 * The spin lock isn't actually needed on 64bit archs, but we
169 * don't yet care too much about such optimizations.
170 */
171 spin_lock(&fc->lock);
172 curr_version = fc->attr_version;
173 spin_unlock(&fc->lock);
174
175 return curr_version;
176}
177
Miklos Szeredi6f9f1182006-01-06 00:19:39 -0800178/*
179 * Check whether the dentry is still valid
180 *
181 * If the entry validity timeout has expired and the dentry is
182 * positive, try to redo the lookup. If the lookup results in a
183 * different inode, then let the VFS invalidate the dentry and redo
184 * the lookup once more. If the lookup results in the same inode,
185 * then refresh the attributes, timeouts and mark the dentry valid.
186 */
Al Viro0b728e12012-06-10 16:03:43 -0400187static int fuse_dentry_revalidate(struct dentry *entry, unsigned int flags)
Miklos Szeredie5e55582005-09-09 13:10:28 -0700188{
Nick Piggin34286d62011-01-07 17:49:57 +1100189 struct inode *inode;
Miklos Szeredi28420da2013-06-03 14:40:22 +0200190 struct dentry *parent;
191 struct fuse_conn *fc;
Miklos Szeredi6314efe2013-10-01 16:41:22 +0200192 struct fuse_inode *fi;
Miklos Szeredie2a6b952013-09-05 11:44:43 +0200193 int ret;
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -0800194
David Howells2b0143b2015-03-17 22:25:59 +0000195 inode = d_inode_rcu(entry);
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -0800196 if (inode && is_bad_inode(inode))
Miklos Szeredie2a6b952013-09-05 11:44:43 +0200197 goto invalid;
Anand Avati154210c2014-06-26 20:21:57 -0400198 else if (time_before64(fuse_dentry_time(entry), get_jiffies_64()) ||
199 (flags & LOOKUP_REVAL)) {
Miklos Szeredie5e55582005-09-09 13:10:28 -0700200 struct fuse_entry_out outarg;
Miklos Szeredi70781872014-12-12 09:49:05 +0100201 FUSE_ARGS(args);
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100202 struct fuse_forget_link *forget;
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700203 u64 attr_version;
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -0800204
Miklos Szeredi50322fe2006-02-28 16:59:03 -0800205 /* For negative dentries, always do a fresh lookup */
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -0800206 if (!inode)
Miklos Szeredie2a6b952013-09-05 11:44:43 +0200207 goto invalid;
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -0800208
Miklos Szeredie2a6b952013-09-05 11:44:43 +0200209 ret = -ECHILD;
Al Viro0b728e12012-06-10 16:03:43 -0400210 if (flags & LOOKUP_RCU)
Miklos Szeredie2a6b952013-09-05 11:44:43 +0200211 goto out;
Miklos Szeredie7c0a162011-03-21 13:58:06 +0100212
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -0800213 fc = get_fuse_conn(inode);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700214
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100215 forget = fuse_alloc_forget();
Miklos Szeredi70781872014-12-12 09:49:05 +0100216 ret = -ENOMEM;
217 if (!forget)
Miklos Szeredie2a6b952013-09-05 11:44:43 +0200218 goto out;
Miklos Szeredi2d510132006-11-25 11:09:20 -0800219
Miklos Szeredi7dca9fd2007-11-28 16:21:59 -0800220 attr_version = fuse_get_attr_version(fc);
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700221
Miklos Szeredie956edd2006-10-17 00:10:12 -0700222 parent = dget_parent(entry);
David Howells2b0143b2015-03-17 22:25:59 +0000223 fuse_lookup_init(fc, &args, get_node_id(d_inode(parent)),
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700224 &entry->d_name, &outarg);
Miklos Szeredi70781872014-12-12 09:49:05 +0100225 ret = fuse_simple_request(fc, &args);
Miklos Szeredie956edd2006-10-17 00:10:12 -0700226 dput(parent);
Miklos Szeredi50322fe2006-02-28 16:59:03 -0800227 /* Zero nodeid is same as -ENOENT */
Miklos Szeredi70781872014-12-12 09:49:05 +0100228 if (!ret && !outarg.nodeid)
229 ret = -ENOENT;
230 if (!ret) {
Miklos Szeredi6314efe2013-10-01 16:41:22 +0200231 fi = get_fuse_inode(inode);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700232 if (outarg.nodeid != get_node_id(inode)) {
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100233 fuse_queue_forget(fc, forget, outarg.nodeid, 1);
Miklos Szeredie2a6b952013-09-05 11:44:43 +0200234 goto invalid;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700235 }
Miklos Szeredi8da5ff22006-10-17 00:10:08 -0700236 spin_lock(&fc->lock);
Miklos Szeredi1729a162008-11-26 12:03:54 +0100237 fi->nlookup++;
Miklos Szeredi8da5ff22006-10-17 00:10:08 -0700238 spin_unlock(&fc->lock);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700239 }
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100240 kfree(forget);
Miklos Szeredi70781872014-12-12 09:49:05 +0100241 if (ret == -ENOMEM)
242 goto out;
243 if (ret || (outarg.attr.mode ^ inode->i_mode) & S_IFMT)
Miklos Szeredie2a6b952013-09-05 11:44:43 +0200244 goto invalid;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700245
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700246 fuse_change_attributes(inode, &outarg.attr,
247 entry_attr_timeout(&outarg),
248 attr_version);
249 fuse_change_entry_timeout(entry, &outarg);
Miklos Szeredi28420da2013-06-03 14:40:22 +0200250 } else if (inode) {
Miklos Szeredi6314efe2013-10-01 16:41:22 +0200251 fi = get_fuse_inode(inode);
252 if (flags & LOOKUP_RCU) {
253 if (test_bit(FUSE_I_INIT_RDPLUS, &fi->state))
254 return -ECHILD;
255 } else if (test_and_clear_bit(FUSE_I_INIT_RDPLUS, &fi->state)) {
Miklos Szeredi28420da2013-06-03 14:40:22 +0200256 parent = dget_parent(entry);
David Howells2b0143b2015-03-17 22:25:59 +0000257 fuse_advise_use_readdirplus(d_inode(parent));
Miklos Szeredi28420da2013-06-03 14:40:22 +0200258 dput(parent);
259 }
Miklos Szeredie5e55582005-09-09 13:10:28 -0700260 }
Miklos Szeredie2a6b952013-09-05 11:44:43 +0200261 ret = 1;
262out:
263 return ret;
264
265invalid:
266 ret = 0;
267 goto out;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700268}
269
Miklos Szeredi8bfc0162006-01-16 22:14:28 -0800270static int invalid_nodeid(u64 nodeid)
Miklos Szeredi2827d0b22005-11-28 13:44:16 -0800271{
272 return !nodeid || nodeid == FUSE_ROOT_ID;
273}
274
Al Viro42695902009-02-20 05:59:13 +0000275const struct dentry_operations fuse_dentry_operations = {
Miklos Szeredie5e55582005-09-09 13:10:28 -0700276 .d_revalidate = fuse_dentry_revalidate,
277};
278
Timo Savolaa5bfffac2007-04-08 16:04:00 -0700279int fuse_valid_type(int m)
Miklos Szeredi39ee0592006-01-06 00:19:43 -0800280{
281 return S_ISREG(m) || S_ISDIR(m) || S_ISLNK(m) || S_ISCHR(m) ||
282 S_ISBLK(m) || S_ISFIFO(m) || S_ISSOCK(m);
283}
284
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700285int fuse_lookup_name(struct super_block *sb, u64 nodeid, struct qstr *name,
286 struct fuse_entry_out *outarg, struct inode **inode)
287{
288 struct fuse_conn *fc = get_fuse_conn_super(sb);
Miklos Szeredi70781872014-12-12 09:49:05 +0100289 FUSE_ARGS(args);
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100290 struct fuse_forget_link *forget;
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700291 u64 attr_version;
292 int err;
293
294 *inode = NULL;
295 err = -ENAMETOOLONG;
296 if (name->len > FUSE_NAME_MAX)
297 goto out;
298
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700299
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100300 forget = fuse_alloc_forget();
301 err = -ENOMEM;
Miklos Szeredi70781872014-12-12 09:49:05 +0100302 if (!forget)
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700303 goto out;
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700304
305 attr_version = fuse_get_attr_version(fc);
306
Miklos Szeredi70781872014-12-12 09:49:05 +0100307 fuse_lookup_init(fc, &args, nodeid, name, outarg);
308 err = fuse_simple_request(fc, &args);
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700309 /* Zero nodeid is same as -ENOENT, but with valid timeout */
310 if (err || !outarg->nodeid)
311 goto out_put_forget;
312
313 err = -EIO;
314 if (!outarg->nodeid)
315 goto out_put_forget;
316 if (!fuse_valid_type(outarg->attr.mode))
317 goto out_put_forget;
318
319 *inode = fuse_iget(sb, outarg->nodeid, outarg->generation,
320 &outarg->attr, entry_attr_timeout(outarg),
321 attr_version);
322 err = -ENOMEM;
323 if (!*inode) {
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100324 fuse_queue_forget(fc, forget, outarg->nodeid, 1);
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700325 goto out;
326 }
327 err = 0;
328
329 out_put_forget:
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100330 kfree(forget);
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700331 out:
332 return err;
333}
334
Miklos Szeredi0aa7c692006-01-06 00:19:34 -0800335static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
Al Viro00cd8dd2012-06-10 17:13:09 -0400336 unsigned int flags)
Miklos Szeredie5e55582005-09-09 13:10:28 -0700337{
338 int err;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700339 struct fuse_entry_out outarg;
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700340 struct inode *inode;
Miklos Szeredi0de62562008-07-25 01:48:59 -0700341 struct dentry *newent;
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700342 bool outarg_valid = true;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700343
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700344 err = fuse_lookup_name(dir->i_sb, get_node_id(dir), &entry->d_name,
345 &outarg, &inode);
346 if (err == -ENOENT) {
347 outarg_valid = false;
348 err = 0;
Miklos Szeredi2d510132006-11-25 11:09:20 -0800349 }
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700350 if (err)
351 goto out_err;
Miklos Szeredi2d510132006-11-25 11:09:20 -0800352
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700353 err = -EIO;
354 if (inode && get_node_id(inode) == FUSE_ROOT_ID)
355 goto out_iput;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700356
Al Viro41d28bc2014-10-12 22:24:21 -0400357 newent = d_splice_alias(inode, entry);
Miklos Szeredi5835f332013-09-05 11:44:42 +0200358 err = PTR_ERR(newent);
359 if (IS_ERR(newent))
360 goto out_err;
Miklos Szeredid2a85162006-10-17 00:10:11 -0700361
Miklos Szeredi0de62562008-07-25 01:48:59 -0700362 entry = newent ? newent : entry;
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700363 if (outarg_valid)
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700364 fuse_change_entry_timeout(entry, &outarg);
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -0800365 else
366 fuse_invalidate_entry_cache(entry);
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700367
Feng Shuo4582a4a2013-01-15 11:23:28 +0800368 fuse_advise_use_readdirplus(dir);
Miklos Szeredi0de62562008-07-25 01:48:59 -0700369 return newent;
Miklos Szeredic180eeb2008-07-25 01:49:01 -0700370
371 out_iput:
372 iput(inode);
373 out_err:
374 return ERR_PTR(err);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700375}
376
Miklos Szeredi6f9f1182006-01-06 00:19:39 -0800377/*
378 * Atomic create+open operation
379 *
380 * If the filesystem doesn't support this, then fall back to separate
381 * 'mknod' + 'open' requests.
382 */
Al Virod9585272012-06-22 12:39:14 +0400383static int fuse_create_open(struct inode *dir, struct dentry *entry,
Al Viro30d90492012-06-22 12:40:19 +0400384 struct file *file, unsigned flags,
Al Virod9585272012-06-22 12:39:14 +0400385 umode_t mode, int *opened)
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800386{
387 int err;
388 struct inode *inode;
389 struct fuse_conn *fc = get_fuse_conn(dir);
Miklos Szeredi70781872014-12-12 09:49:05 +0100390 FUSE_ARGS(args);
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100391 struct fuse_forget_link *forget;
Miklos Szeredie0a43dd2009-06-30 20:12:23 +0200392 struct fuse_create_in inarg;
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800393 struct fuse_open_out outopen;
394 struct fuse_entry_out outentry;
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800395 struct fuse_file *ff;
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800396
Miklos Szerediaf109bc2012-08-15 13:01:24 +0200397 /* Userspace expects S_IFREG in create mode */
398 BUG_ON((mode & S_IFMT) != S_IFREG);
399
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100400 forget = fuse_alloc_forget();
Miklos Szeredic8ccbe02012-06-05 15:10:22 +0200401 err = -ENOMEM;
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100402 if (!forget)
Miklos Szeredic8ccbe02012-06-05 15:10:22 +0200403 goto out_err;
Miklos Szeredi51eb01e2006-06-25 05:48:50 -0700404
Miklos Szeredice1d5a42006-04-10 22:54:58 -0700405 err = -ENOMEM;
Tejun Heoacf99432008-11-26 12:03:55 +0100406 ff = fuse_file_alloc(fc);
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800407 if (!ff)
Miklos Szeredi70781872014-12-12 09:49:05 +0100408 goto out_put_forget_req;
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800409
Miklos Szeredie0a43dd2009-06-30 20:12:23 +0200410 if (!fc->dont_mask)
411 mode &= ~current_umask();
412
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800413 flags &= ~O_NOCTTY;
414 memset(&inarg, 0, sizeof(inarg));
Miklos Szeredi0e9663e2007-10-18 03:07:05 -0700415 memset(&outentry, 0, sizeof(outentry));
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800416 inarg.flags = flags;
417 inarg.mode = mode;
Miklos Szeredie0a43dd2009-06-30 20:12:23 +0200418 inarg.umask = current_umask();
Miklos Szeredi70781872014-12-12 09:49:05 +0100419 args.in.h.opcode = FUSE_CREATE;
420 args.in.h.nodeid = get_node_id(dir);
421 args.in.numargs = 2;
Miklos Szeredi21f62172015-01-06 10:45:35 +0100422 args.in.args[0].size = sizeof(inarg);
Miklos Szeredi70781872014-12-12 09:49:05 +0100423 args.in.args[0].value = &inarg;
424 args.in.args[1].size = entry->d_name.len + 1;
425 args.in.args[1].value = entry->d_name.name;
426 args.out.numargs = 2;
Miklos Szeredi21f62172015-01-06 10:45:35 +0100427 args.out.args[0].size = sizeof(outentry);
Miklos Szeredi70781872014-12-12 09:49:05 +0100428 args.out.args[0].value = &outentry;
429 args.out.args[1].size = sizeof(outopen);
430 args.out.args[1].value = &outopen;
431 err = fuse_simple_request(fc, &args);
Miklos Szeredic8ccbe02012-06-05 15:10:22 +0200432 if (err)
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800433 goto out_free_ff;
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800434
435 err = -EIO;
Miklos Szeredi2827d0b22005-11-28 13:44:16 -0800436 if (!S_ISREG(outentry.attr.mode) || invalid_nodeid(outentry.nodeid))
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800437 goto out_free_ff;
438
Miklos Szeredic7b71432009-04-28 16:56:37 +0200439 ff->fh = outopen.fh;
440 ff->nodeid = outentry.nodeid;
441 ff->open_flags = outopen.open_flags;
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800442 inode = fuse_iget(dir->i_sb, outentry.nodeid, outentry.generation,
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700443 &outentry.attr, entry_attr_timeout(&outentry), 0);
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800444 if (!inode) {
445 flags &= ~(O_CREAT | O_EXCL | O_TRUNC);
Miklos Szeredi8b0797a2009-04-28 16:56:39 +0200446 fuse_sync_release(ff, flags);
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100447 fuse_queue_forget(fc, forget, outentry.nodeid, 1);
Miklos Szeredic8ccbe02012-06-05 15:10:22 +0200448 err = -ENOMEM;
449 goto out_err;
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800450 }
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100451 kfree(forget);
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800452 d_instantiate(entry, inode);
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700453 fuse_change_entry_timeout(entry, &outentry);
Miklos Szeredi0952b2a2008-02-06 01:38:38 -0800454 fuse_invalidate_attr(dir);
Al Viro30d90492012-06-22 12:40:19 +0400455 err = finish_open(file, entry, generic_file_open, opened);
456 if (err) {
Miklos Szeredi8b0797a2009-04-28 16:56:39 +0200457 fuse_sync_release(ff, flags);
Miklos Szeredic8ccbe02012-06-05 15:10:22 +0200458 } else {
459 file->private_data = fuse_file_get(ff);
460 fuse_finish_open(inode, file);
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800461 }
Al Virod9585272012-06-22 12:39:14 +0400462 return err;
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800463
Miklos Szeredic8ccbe02012-06-05 15:10:22 +0200464out_free_ff:
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800465 fuse_file_free(ff);
Miklos Szeredic8ccbe02012-06-05 15:10:22 +0200466out_put_forget_req:
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100467 kfree(forget);
Miklos Szeredic8ccbe02012-06-05 15:10:22 +0200468out_err:
Al Virod9585272012-06-22 12:39:14 +0400469 return err;
Miklos Szeredic8ccbe02012-06-05 15:10:22 +0200470}
471
472static int fuse_mknod(struct inode *, struct dentry *, umode_t, dev_t);
Al Virod9585272012-06-22 12:39:14 +0400473static int fuse_atomic_open(struct inode *dir, struct dentry *entry,
Al Viro30d90492012-06-22 12:40:19 +0400474 struct file *file, unsigned flags,
Al Virod9585272012-06-22 12:39:14 +0400475 umode_t mode, int *opened)
Miklos Szeredic8ccbe02012-06-05 15:10:22 +0200476{
477 int err;
478 struct fuse_conn *fc = get_fuse_conn(dir);
Miklos Szeredic8ccbe02012-06-05 15:10:22 +0200479 struct dentry *res = NULL;
480
481 if (d_unhashed(entry)) {
Al Viro00cd8dd2012-06-10 17:13:09 -0400482 res = fuse_lookup(dir, entry, 0);
Miklos Szeredic8ccbe02012-06-05 15:10:22 +0200483 if (IS_ERR(res))
Al Virod9585272012-06-22 12:39:14 +0400484 return PTR_ERR(res);
Miklos Szeredic8ccbe02012-06-05 15:10:22 +0200485
486 if (res)
487 entry = res;
488 }
489
David Howells2b0143b2015-03-17 22:25:59 +0000490 if (!(flags & O_CREAT) || d_really_is_positive(entry))
Miklos Szeredic8ccbe02012-06-05 15:10:22 +0200491 goto no_open;
492
493 /* Only creates */
Al Viro47237682012-06-10 05:01:45 -0400494 *opened |= FILE_CREATED;
Miklos Szeredic8ccbe02012-06-05 15:10:22 +0200495
496 if (fc->no_create)
497 goto mknod;
498
Al Viro30d90492012-06-22 12:40:19 +0400499 err = fuse_create_open(dir, entry, file, flags, mode, opened);
Al Virod9585272012-06-22 12:39:14 +0400500 if (err == -ENOSYS) {
Miklos Szeredic8ccbe02012-06-05 15:10:22 +0200501 fc->no_create = 1;
502 goto mknod;
503 }
504out_dput:
505 dput(res);
Al Virod9585272012-06-22 12:39:14 +0400506 return err;
Miklos Szeredic8ccbe02012-06-05 15:10:22 +0200507
508mknod:
509 err = fuse_mknod(dir, entry, mode, 0);
Al Virod9585272012-06-22 12:39:14 +0400510 if (err)
Miklos Szeredic8ccbe02012-06-05 15:10:22 +0200511 goto out_dput;
Miklos Szeredic8ccbe02012-06-05 15:10:22 +0200512no_open:
Al Viroe45198a2012-06-10 06:48:09 -0400513 return finish_no_open(file, res);
Miklos Szeredifd72faa2005-11-07 00:59:51 -0800514}
515
Miklos Szeredi6f9f1182006-01-06 00:19:39 -0800516/*
517 * Code shared between mknod, mkdir, symlink and link
518 */
Miklos Szeredi70781872014-12-12 09:49:05 +0100519static int create_new_entry(struct fuse_conn *fc, struct fuse_args *args,
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700520 struct inode *dir, struct dentry *entry,
Al Viro541af6a2011-07-26 03:17:33 -0400521 umode_t mode)
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700522{
523 struct fuse_entry_out outarg;
524 struct inode *inode;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700525 int err;
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100526 struct fuse_forget_link *forget;
Miklos Szeredi2d510132006-11-25 11:09:20 -0800527
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100528 forget = fuse_alloc_forget();
Miklos Szeredi70781872014-12-12 09:49:05 +0100529 if (!forget)
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100530 return -ENOMEM;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700531
Miklos Szeredi0e9663e2007-10-18 03:07:05 -0700532 memset(&outarg, 0, sizeof(outarg));
Miklos Szeredi70781872014-12-12 09:49:05 +0100533 args->in.h.nodeid = get_node_id(dir);
534 args->out.numargs = 1;
Miklos Szeredi21f62172015-01-06 10:45:35 +0100535 args->out.args[0].size = sizeof(outarg);
Miklos Szeredi70781872014-12-12 09:49:05 +0100536 args->out.args[0].value = &outarg;
537 err = fuse_simple_request(fc, args);
Miklos Szeredi2d510132006-11-25 11:09:20 -0800538 if (err)
539 goto out_put_forget_req;
540
Miklos Szeredi39ee0592006-01-06 00:19:43 -0800541 err = -EIO;
542 if (invalid_nodeid(outarg.nodeid))
Miklos Szeredi2d510132006-11-25 11:09:20 -0800543 goto out_put_forget_req;
Miklos Szeredi39ee0592006-01-06 00:19:43 -0800544
545 if ((outarg.attr.mode ^ mode) & S_IFMT)
Miklos Szeredi2d510132006-11-25 11:09:20 -0800546 goto out_put_forget_req;
Miklos Szeredi39ee0592006-01-06 00:19:43 -0800547
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700548 inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation,
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700549 &outarg.attr, entry_attr_timeout(&outarg), 0);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700550 if (!inode) {
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100551 fuse_queue_forget(fc, forget, outarg.nodeid, 1);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700552 return -ENOMEM;
553 }
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100554 kfree(forget);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700555
Miklos Szeredib70a80e2013-10-01 16:44:54 +0200556 err = d_instantiate_no_diralias(entry, inode);
557 if (err)
558 return err;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700559
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700560 fuse_change_entry_timeout(entry, &outarg);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700561 fuse_invalidate_attr(dir);
562 return 0;
Miklos Szeredi39ee0592006-01-06 00:19:43 -0800563
Miklos Szeredi2d510132006-11-25 11:09:20 -0800564 out_put_forget_req:
Miklos Szeredi07e77dc2010-12-07 20:16:56 +0100565 kfree(forget);
Miklos Szeredi39ee0592006-01-06 00:19:43 -0800566 return err;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700567}
568
Al Viro1a67aaf2011-07-26 01:52:52 -0400569static int fuse_mknod(struct inode *dir, struct dentry *entry, umode_t mode,
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700570 dev_t rdev)
571{
572 struct fuse_mknod_in inarg;
573 struct fuse_conn *fc = get_fuse_conn(dir);
Miklos Szeredi70781872014-12-12 09:49:05 +0100574 FUSE_ARGS(args);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700575
Miklos Szeredie0a43dd2009-06-30 20:12:23 +0200576 if (!fc->dont_mask)
577 mode &= ~current_umask();
578
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700579 memset(&inarg, 0, sizeof(inarg));
580 inarg.mode = mode;
581 inarg.rdev = new_encode_dev(rdev);
Miklos Szeredie0a43dd2009-06-30 20:12:23 +0200582 inarg.umask = current_umask();
Miklos Szeredi70781872014-12-12 09:49:05 +0100583 args.in.h.opcode = FUSE_MKNOD;
584 args.in.numargs = 2;
Miklos Szeredi21f62172015-01-06 10:45:35 +0100585 args.in.args[0].size = sizeof(inarg);
Miklos Szeredi70781872014-12-12 09:49:05 +0100586 args.in.args[0].value = &inarg;
587 args.in.args[1].size = entry->d_name.len + 1;
588 args.in.args[1].value = entry->d_name.name;
589 return create_new_entry(fc, &args, dir, entry, mode);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700590}
591
Al Viro4acdaf22011-07-26 01:42:34 -0400592static int fuse_create(struct inode *dir, struct dentry *entry, umode_t mode,
Al Viroebfc3b42012-06-10 18:05:36 -0400593 bool excl)
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700594{
595 return fuse_mknod(dir, entry, mode, 0);
596}
597
Al Viro18bb1db2011-07-26 01:41:39 -0400598static int fuse_mkdir(struct inode *dir, struct dentry *entry, umode_t mode)
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700599{
600 struct fuse_mkdir_in inarg;
601 struct fuse_conn *fc = get_fuse_conn(dir);
Miklos Szeredi70781872014-12-12 09:49:05 +0100602 FUSE_ARGS(args);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700603
Miklos Szeredie0a43dd2009-06-30 20:12:23 +0200604 if (!fc->dont_mask)
605 mode &= ~current_umask();
606
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700607 memset(&inarg, 0, sizeof(inarg));
608 inarg.mode = mode;
Miklos Szeredie0a43dd2009-06-30 20:12:23 +0200609 inarg.umask = current_umask();
Miklos Szeredi70781872014-12-12 09:49:05 +0100610 args.in.h.opcode = FUSE_MKDIR;
611 args.in.numargs = 2;
612 args.in.args[0].size = sizeof(inarg);
613 args.in.args[0].value = &inarg;
614 args.in.args[1].size = entry->d_name.len + 1;
615 args.in.args[1].value = entry->d_name.name;
616 return create_new_entry(fc, &args, dir, entry, S_IFDIR);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700617}
618
619static int fuse_symlink(struct inode *dir, struct dentry *entry,
620 const char *link)
621{
622 struct fuse_conn *fc = get_fuse_conn(dir);
623 unsigned len = strlen(link) + 1;
Miklos Szeredi70781872014-12-12 09:49:05 +0100624 FUSE_ARGS(args);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700625
Miklos Szeredi70781872014-12-12 09:49:05 +0100626 args.in.h.opcode = FUSE_SYMLINK;
627 args.in.numargs = 2;
628 args.in.args[0].size = entry->d_name.len + 1;
629 args.in.args[0].value = entry->d_name.name;
630 args.in.args[1].size = len;
631 args.in.args[1].value = link;
632 return create_new_entry(fc, &args, dir, entry, S_IFLNK);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700633}
634
Maxim Patlasov31f32672014-04-28 14:19:24 +0200635static inline void fuse_update_ctime(struct inode *inode)
636{
637 if (!IS_NOCMTIME(inode)) {
638 inode->i_ctime = current_fs_time(inode->i_sb);
639 mark_inode_dirty_sync(inode);
640 }
641}
642
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700643static int fuse_unlink(struct inode *dir, struct dentry *entry)
644{
645 int err;
646 struct fuse_conn *fc = get_fuse_conn(dir);
Miklos Szeredi70781872014-12-12 09:49:05 +0100647 FUSE_ARGS(args);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700648
Miklos Szeredi70781872014-12-12 09:49:05 +0100649 args.in.h.opcode = FUSE_UNLINK;
650 args.in.h.nodeid = get_node_id(dir);
651 args.in.numargs = 1;
652 args.in.args[0].size = entry->d_name.len + 1;
653 args.in.args[0].value = entry->d_name.name;
654 err = fuse_simple_request(fc, &args);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700655 if (!err) {
David Howells2b0143b2015-03-17 22:25:59 +0000656 struct inode *inode = d_inode(entry);
Miklos Szerediac45d612012-03-05 15:48:11 +0100657 struct fuse_inode *fi = get_fuse_inode(inode);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700658
Miklos Szerediac45d612012-03-05 15:48:11 +0100659 spin_lock(&fc->lock);
660 fi->attr_version = ++fc->attr_version;
Miklos Szeredidfca7ce2013-02-04 15:57:42 +0100661 /*
662 * If i_nlink == 0 then unlink doesn't make sense, yet this can
663 * happen if userspace filesystem is careless. It would be
664 * difficult to enforce correct nlink usage so just ignore this
665 * condition here
666 */
667 if (inode->i_nlink > 0)
668 drop_nlink(inode);
Miklos Szerediac45d612012-03-05 15:48:11 +0100669 spin_unlock(&fc->lock);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700670 fuse_invalidate_attr(inode);
671 fuse_invalidate_attr(dir);
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -0800672 fuse_invalidate_entry_cache(entry);
Maxim Patlasov31f32672014-04-28 14:19:24 +0200673 fuse_update_ctime(inode);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700674 } else if (err == -EINTR)
675 fuse_invalidate_entry(entry);
676 return err;
677}
678
679static int fuse_rmdir(struct inode *dir, struct dentry *entry)
680{
681 int err;
682 struct fuse_conn *fc = get_fuse_conn(dir);
Miklos Szeredi70781872014-12-12 09:49:05 +0100683 FUSE_ARGS(args);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700684
Miklos Szeredi70781872014-12-12 09:49:05 +0100685 args.in.h.opcode = FUSE_RMDIR;
686 args.in.h.nodeid = get_node_id(dir);
687 args.in.numargs = 1;
688 args.in.args[0].size = entry->d_name.len + 1;
689 args.in.args[0].value = entry->d_name.name;
690 err = fuse_simple_request(fc, &args);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700691 if (!err) {
David Howells2b0143b2015-03-17 22:25:59 +0000692 clear_nlink(d_inode(entry));
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700693 fuse_invalidate_attr(dir);
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -0800694 fuse_invalidate_entry_cache(entry);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700695 } else if (err == -EINTR)
696 fuse_invalidate_entry(entry);
697 return err;
698}
699
Miklos Szeredi1560c972014-04-28 16:43:44 +0200700static int fuse_rename_common(struct inode *olddir, struct dentry *oldent,
701 struct inode *newdir, struct dentry *newent,
702 unsigned int flags, int opcode, size_t argsize)
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700703{
704 int err;
Miklos Szeredi1560c972014-04-28 16:43:44 +0200705 struct fuse_rename2_in inarg;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700706 struct fuse_conn *fc = get_fuse_conn(olddir);
Miklos Szeredi70781872014-12-12 09:49:05 +0100707 FUSE_ARGS(args);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700708
Miklos Szeredi1560c972014-04-28 16:43:44 +0200709 memset(&inarg, 0, argsize);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700710 inarg.newdir = get_node_id(newdir);
Miklos Szeredi1560c972014-04-28 16:43:44 +0200711 inarg.flags = flags;
Miklos Szeredi70781872014-12-12 09:49:05 +0100712 args.in.h.opcode = opcode;
713 args.in.h.nodeid = get_node_id(olddir);
714 args.in.numargs = 3;
715 args.in.args[0].size = argsize;
716 args.in.args[0].value = &inarg;
717 args.in.args[1].size = oldent->d_name.len + 1;
718 args.in.args[1].value = oldent->d_name.name;
719 args.in.args[2].size = newent->d_name.len + 1;
720 args.in.args[2].value = newent->d_name.name;
721 err = fuse_simple_request(fc, &args);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700722 if (!err) {
Miklos Szeredi08b63302007-11-28 16:22:03 -0800723 /* ctime changes */
David Howells2b0143b2015-03-17 22:25:59 +0000724 fuse_invalidate_attr(d_inode(oldent));
725 fuse_update_ctime(d_inode(oldent));
Miklos Szeredi08b63302007-11-28 16:22:03 -0800726
Miklos Szeredi1560c972014-04-28 16:43:44 +0200727 if (flags & RENAME_EXCHANGE) {
David Howells2b0143b2015-03-17 22:25:59 +0000728 fuse_invalidate_attr(d_inode(newent));
729 fuse_update_ctime(d_inode(newent));
Miklos Szeredi1560c972014-04-28 16:43:44 +0200730 }
731
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700732 fuse_invalidate_attr(olddir);
733 if (olddir != newdir)
734 fuse_invalidate_attr(newdir);
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -0800735
736 /* newent will end up negative */
David Howells2b0143b2015-03-17 22:25:59 +0000737 if (!(flags & RENAME_EXCHANGE) && d_really_is_positive(newent)) {
738 fuse_invalidate_attr(d_inode(newent));
Miklos Szeredi8cbdf1e2006-01-06 00:19:38 -0800739 fuse_invalidate_entry_cache(newent);
David Howells2b0143b2015-03-17 22:25:59 +0000740 fuse_update_ctime(d_inode(newent));
Miklos Szeredi5219f342009-11-04 10:24:52 +0100741 }
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700742 } else if (err == -EINTR) {
743 /* If request was interrupted, DEITY only knows if the
744 rename actually took place. If the invalidation
745 fails (e.g. some process has CWD under the renamed
746 directory), then there can be inconsistency between
747 the dcache and the real filesystem. Tough luck. */
748 fuse_invalidate_entry(oldent);
David Howells2b0143b2015-03-17 22:25:59 +0000749 if (d_really_is_positive(newent))
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700750 fuse_invalidate_entry(newent);
751 }
752
753 return err;
754}
755
Miklos Szeredi1560c972014-04-28 16:43:44 +0200756static int fuse_rename2(struct inode *olddir, struct dentry *oldent,
757 struct inode *newdir, struct dentry *newent,
758 unsigned int flags)
759{
760 struct fuse_conn *fc = get_fuse_conn(olddir);
761 int err;
762
763 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE))
764 return -EINVAL;
765
Miklos Szeredi4237ba42014-07-10 10:50:19 +0200766 if (flags) {
767 if (fc->no_rename2 || fc->minor < 23)
768 return -EINVAL;
Miklos Szeredi1560c972014-04-28 16:43:44 +0200769
Miklos Szeredi4237ba42014-07-10 10:50:19 +0200770 err = fuse_rename_common(olddir, oldent, newdir, newent, flags,
771 FUSE_RENAME2,
772 sizeof(struct fuse_rename2_in));
773 if (err == -ENOSYS) {
774 fc->no_rename2 = 1;
775 err = -EINVAL;
776 }
777 } else {
778 err = fuse_rename_common(olddir, oldent, newdir, newent, 0,
779 FUSE_RENAME,
780 sizeof(struct fuse_rename_in));
Miklos Szeredi1560c972014-04-28 16:43:44 +0200781 }
Miklos Szeredi1560c972014-04-28 16:43:44 +0200782
Miklos Szeredi4237ba42014-07-10 10:50:19 +0200783 return err;
784}
785
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700786static int fuse_link(struct dentry *entry, struct inode *newdir,
787 struct dentry *newent)
788{
789 int err;
790 struct fuse_link_in inarg;
David Howells2b0143b2015-03-17 22:25:59 +0000791 struct inode *inode = d_inode(entry);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700792 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredi70781872014-12-12 09:49:05 +0100793 FUSE_ARGS(args);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700794
795 memset(&inarg, 0, sizeof(inarg));
796 inarg.oldnodeid = get_node_id(inode);
Miklos Szeredi70781872014-12-12 09:49:05 +0100797 args.in.h.opcode = FUSE_LINK;
798 args.in.numargs = 2;
799 args.in.args[0].size = sizeof(inarg);
800 args.in.args[0].value = &inarg;
801 args.in.args[1].size = newent->d_name.len + 1;
802 args.in.args[1].value = newent->d_name.name;
803 err = create_new_entry(fc, &args, newdir, newent, inode->i_mode);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700804 /* Contrary to "normal" filesystems it can happen that link
805 makes two "logical" inodes point to the same "physical"
806 inode. We invalidate the attributes of the old one, so it
807 will reflect changes in the backing inode (link count,
808 etc.)
809 */
Miklos Szerediac45d612012-03-05 15:48:11 +0100810 if (!err) {
811 struct fuse_inode *fi = get_fuse_inode(inode);
812
813 spin_lock(&fc->lock);
814 fi->attr_version = ++fc->attr_version;
815 inc_nlink(inode);
816 spin_unlock(&fc->lock);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700817 fuse_invalidate_attr(inode);
Maxim Patlasov31f32672014-04-28 14:19:24 +0200818 fuse_update_ctime(inode);
Miklos Szerediac45d612012-03-05 15:48:11 +0100819 } else if (err == -EINTR) {
820 fuse_invalidate_attr(inode);
821 }
Miklos Szeredi9e6268d2005-09-09 13:10:29 -0700822 return err;
823}
824
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700825static void fuse_fillattr(struct inode *inode, struct fuse_attr *attr,
826 struct kstat *stat)
827{
Miklos Szeredi203627b2012-05-10 19:49:38 +0400828 unsigned int blkbits;
Pavel Emelyanov83732002013-10-10 17:10:46 +0400829 struct fuse_conn *fc = get_fuse_conn(inode);
830
831 /* see the comment in fuse_change_attributes() */
Maxim Patlasovb0aa7602013-12-26 19:51:11 +0400832 if (fc->writeback_cache && S_ISREG(inode->i_mode)) {
Pavel Emelyanov83732002013-10-10 17:10:46 +0400833 attr->size = i_size_read(inode);
Maxim Patlasovb0aa7602013-12-26 19:51:11 +0400834 attr->mtime = inode->i_mtime.tv_sec;
835 attr->mtimensec = inode->i_mtime.tv_nsec;
Maxim Patlasov31f32672014-04-28 14:19:24 +0200836 attr->ctime = inode->i_ctime.tv_sec;
837 attr->ctimensec = inode->i_ctime.tv_nsec;
Maxim Patlasovb0aa7602013-12-26 19:51:11 +0400838 }
Miklos Szeredi203627b2012-05-10 19:49:38 +0400839
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700840 stat->dev = inode->i_sb->s_dev;
841 stat->ino = attr->ino;
842 stat->mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777);
843 stat->nlink = attr->nlink;
Eric W. Biederman499dcf22012-02-07 16:26:03 -0800844 stat->uid = make_kuid(&init_user_ns, attr->uid);
845 stat->gid = make_kgid(&init_user_ns, attr->gid);
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700846 stat->rdev = inode->i_rdev;
847 stat->atime.tv_sec = attr->atime;
848 stat->atime.tv_nsec = attr->atimensec;
849 stat->mtime.tv_sec = attr->mtime;
850 stat->mtime.tv_nsec = attr->mtimensec;
851 stat->ctime.tv_sec = attr->ctime;
852 stat->ctime.tv_nsec = attr->ctimensec;
853 stat->size = attr->size;
854 stat->blocks = attr->blocks;
Miklos Szeredi203627b2012-05-10 19:49:38 +0400855
856 if (attr->blksize != 0)
857 blkbits = ilog2(attr->blksize);
858 else
859 blkbits = inode->i_sb->s_blocksize_bits;
860
861 stat->blksize = 1 << blkbits;
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700862}
863
Miklos Szeredic79e3222007-10-18 03:06:59 -0700864static int fuse_do_getattr(struct inode *inode, struct kstat *stat,
865 struct file *file)
Miklos Szeredie5e55582005-09-09 13:10:28 -0700866{
867 int err;
Miklos Szeredic79e3222007-10-18 03:06:59 -0700868 struct fuse_getattr_in inarg;
869 struct fuse_attr_out outarg;
Miklos Szeredie5e55582005-09-09 13:10:28 -0700870 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredi70781872014-12-12 09:49:05 +0100871 FUSE_ARGS(args);
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700872 u64 attr_version;
873
Miklos Szeredi7dca9fd2007-11-28 16:21:59 -0800874 attr_version = fuse_get_attr_version(fc);
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700875
Miklos Szeredic79e3222007-10-18 03:06:59 -0700876 memset(&inarg, 0, sizeof(inarg));
Miklos Szeredi0e9663e2007-10-18 03:07:05 -0700877 memset(&outarg, 0, sizeof(outarg));
Miklos Szeredic79e3222007-10-18 03:06:59 -0700878 /* Directories have separate file-handle space */
879 if (file && S_ISREG(inode->i_mode)) {
880 struct fuse_file *ff = file->private_data;
881
882 inarg.getattr_flags |= FUSE_GETATTR_FH;
883 inarg.fh = ff->fh;
884 }
Miklos Szeredi70781872014-12-12 09:49:05 +0100885 args.in.h.opcode = FUSE_GETATTR;
886 args.in.h.nodeid = get_node_id(inode);
887 args.in.numargs = 1;
888 args.in.args[0].size = sizeof(inarg);
889 args.in.args[0].value = &inarg;
890 args.out.numargs = 1;
Miklos Szeredi21f62172015-01-06 10:45:35 +0100891 args.out.args[0].size = sizeof(outarg);
Miklos Szeredi70781872014-12-12 09:49:05 +0100892 args.out.args[0].value = &outarg;
893 err = fuse_simple_request(fc, &args);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700894 if (!err) {
Miklos Szeredic79e3222007-10-18 03:06:59 -0700895 if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) {
Miklos Szeredie5e55582005-09-09 13:10:28 -0700896 make_bad_inode(inode);
897 err = -EIO;
898 } else {
Miklos Szeredic79e3222007-10-18 03:06:59 -0700899 fuse_change_attributes(inode, &outarg.attr,
900 attr_timeout(&outarg),
Miklos Szeredi1fb69e72007-10-18 03:06:58 -0700901 attr_version);
902 if (stat)
Miklos Szeredic79e3222007-10-18 03:06:59 -0700903 fuse_fillattr(inode, &outarg.attr, stat);
Miklos Szeredie5e55582005-09-09 13:10:28 -0700904 }
905 }
906 return err;
907}
908
Miklos Szeredibcb4be82007-11-28 16:21:59 -0800909int fuse_update_attributes(struct inode *inode, struct kstat *stat,
910 struct file *file, bool *refreshed)
911{
912 struct fuse_inode *fi = get_fuse_inode(inode);
913 int err;
914 bool r;
915
Miklos Szeredi126b9d42014-07-07 15:28:50 +0200916 if (time_before64(fi->i_time, get_jiffies_64())) {
Miklos Szeredibcb4be82007-11-28 16:21:59 -0800917 r = true;
918 err = fuse_do_getattr(inode, stat, file);
919 } else {
920 r = false;
921 err = 0;
922 if (stat) {
923 generic_fillattr(inode, stat);
924 stat->mode = fi->orig_i_mode;
Pavel Shilovsky45c72cd2012-05-10 19:49:38 +0400925 stat->ino = fi->orig_ino;
Miklos Szeredibcb4be82007-11-28 16:21:59 -0800926 }
927 }
928
929 if (refreshed != NULL)
930 *refreshed = r;
931
932 return err;
933}
934
John Muir3b463ae2009-05-31 11:13:57 -0400935int fuse_reverse_inval_entry(struct super_block *sb, u64 parent_nodeid,
John Muir451d0f52011-12-06 21:50:06 +0100936 u64 child_nodeid, struct qstr *name)
John Muir3b463ae2009-05-31 11:13:57 -0400937{
938 int err = -ENOTDIR;
939 struct inode *parent;
940 struct dentry *dir;
941 struct dentry *entry;
942
943 parent = ilookup5(sb, parent_nodeid, fuse_inode_eq, &parent_nodeid);
944 if (!parent)
945 return -ENOENT;
946
947 mutex_lock(&parent->i_mutex);
948 if (!S_ISDIR(parent->i_mode))
949 goto unlock;
950
951 err = -ENOENT;
952 dir = d_find_alias(parent);
953 if (!dir)
954 goto unlock;
955
956 entry = d_lookup(dir, name);
957 dput(dir);
958 if (!entry)
959 goto unlock;
960
961 fuse_invalidate_attr(parent);
962 fuse_invalidate_entry(entry);
John Muir451d0f52011-12-06 21:50:06 +0100963
David Howells2b0143b2015-03-17 22:25:59 +0000964 if (child_nodeid != 0 && d_really_is_positive(entry)) {
965 mutex_lock(&d_inode(entry)->i_mutex);
966 if (get_node_id(d_inode(entry)) != child_nodeid) {
John Muir451d0f52011-12-06 21:50:06 +0100967 err = -ENOENT;
968 goto badentry;
969 }
970 if (d_mountpoint(entry)) {
971 err = -EBUSY;
972 goto badentry;
973 }
David Howellse36cb0b2015-01-29 12:02:35 +0000974 if (d_is_dir(entry)) {
John Muir451d0f52011-12-06 21:50:06 +0100975 shrink_dcache_parent(entry);
976 if (!simple_empty(entry)) {
977 err = -ENOTEMPTY;
978 goto badentry;
979 }
David Howells2b0143b2015-03-17 22:25:59 +0000980 d_inode(entry)->i_flags |= S_DEAD;
John Muir451d0f52011-12-06 21:50:06 +0100981 }
982 dont_mount(entry);
David Howells2b0143b2015-03-17 22:25:59 +0000983 clear_nlink(d_inode(entry));
John Muir451d0f52011-12-06 21:50:06 +0100984 err = 0;
985 badentry:
David Howells2b0143b2015-03-17 22:25:59 +0000986 mutex_unlock(&d_inode(entry)->i_mutex);
John Muir451d0f52011-12-06 21:50:06 +0100987 if (!err)
988 d_delete(entry);
989 } else {
990 err = 0;
991 }
John Muir3b463ae2009-05-31 11:13:57 -0400992 dput(entry);
John Muir3b463ae2009-05-31 11:13:57 -0400993
994 unlock:
995 mutex_unlock(&parent->i_mutex);
996 iput(parent);
997 return err;
998}
999
Miklos Szeredi87729a52005-09-09 13:10:34 -07001000/*
1001 * Calling into a user-controlled filesystem gives the filesystem
Anatol Pomozovc2132c12013-01-14 22:30:00 -08001002 * daemon ptrace-like capabilities over the current process. This
Miklos Szeredi87729a52005-09-09 13:10:34 -07001003 * means, that the filesystem daemon is able to record the exact
1004 * filesystem operations performed, and can also control the behavior
1005 * of the requester process in otherwise impossible ways. For example
1006 * it can delay the operation for arbitrary length of time allowing
1007 * DoS against the requester.
1008 *
1009 * For this reason only those processes can call into the filesystem,
1010 * for which the owner of the mount has ptrace privilege. This
1011 * excludes processes started by other users, suid or sgid processes.
1012 */
Anatol Pomozovc2132c12013-01-14 22:30:00 -08001013int fuse_allow_current_process(struct fuse_conn *fc)
Miklos Szeredi87729a52005-09-09 13:10:34 -07001014{
David Howellsc69e8d92008-11-14 10:39:19 +11001015 const struct cred *cred;
David Howellsc69e8d92008-11-14 10:39:19 +11001016
Miklos Szeredi87729a52005-09-09 13:10:34 -07001017 if (fc->flags & FUSE_ALLOW_OTHER)
1018 return 1;
1019
Anatol Pomozovc2132c12013-01-14 22:30:00 -08001020 cred = current_cred();
Eric W. Biederman499dcf22012-02-07 16:26:03 -08001021 if (uid_eq(cred->euid, fc->user_id) &&
1022 uid_eq(cred->suid, fc->user_id) &&
1023 uid_eq(cred->uid, fc->user_id) &&
1024 gid_eq(cred->egid, fc->group_id) &&
1025 gid_eq(cred->sgid, fc->group_id) &&
1026 gid_eq(cred->gid, fc->group_id))
Anatol Pomozovc2132c12013-01-14 22:30:00 -08001027 return 1;
Miklos Szeredi87729a52005-09-09 13:10:34 -07001028
Anatol Pomozovc2132c12013-01-14 22:30:00 -08001029 return 0;
Miklos Szeredi87729a52005-09-09 13:10:34 -07001030}
1031
Miklos Szeredi31d40d72005-11-07 00:59:50 -08001032static int fuse_access(struct inode *inode, int mask)
1033{
1034 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredi70781872014-12-12 09:49:05 +01001035 FUSE_ARGS(args);
Miklos Szeredi31d40d72005-11-07 00:59:50 -08001036 struct fuse_access_in inarg;
1037 int err;
1038
Miklos Szeredi698fa1d2013-10-01 16:41:23 +02001039 BUG_ON(mask & MAY_NOT_BLOCK);
1040
Miklos Szeredi31d40d72005-11-07 00:59:50 -08001041 if (fc->no_access)
1042 return 0;
1043
Miklos Szeredi31d40d72005-11-07 00:59:50 -08001044 memset(&inarg, 0, sizeof(inarg));
Al Viroe6305c42008-07-15 21:03:57 -04001045 inarg.mask = mask & (MAY_READ | MAY_WRITE | MAY_EXEC);
Miklos Szeredi70781872014-12-12 09:49:05 +01001046 args.in.h.opcode = FUSE_ACCESS;
1047 args.in.h.nodeid = get_node_id(inode);
1048 args.in.numargs = 1;
1049 args.in.args[0].size = sizeof(inarg);
1050 args.in.args[0].value = &inarg;
1051 err = fuse_simple_request(fc, &args);
Miklos Szeredi31d40d72005-11-07 00:59:50 -08001052 if (err == -ENOSYS) {
1053 fc->no_access = 1;
1054 err = 0;
1055 }
1056 return err;
1057}
1058
Al Viro10556cb2011-06-20 19:28:19 -04001059static int fuse_perm_getattr(struct inode *inode, int mask)
Miklos Szeredi19690dd2011-03-21 13:58:06 +01001060{
Al Viro10556cb2011-06-20 19:28:19 -04001061 if (mask & MAY_NOT_BLOCK)
Miklos Szeredi19690dd2011-03-21 13:58:06 +01001062 return -ECHILD;
1063
1064 return fuse_do_getattr(inode, NULL, NULL);
1065}
1066
Miklos Szeredi6f9f1182006-01-06 00:19:39 -08001067/*
1068 * Check permission. The two basic access models of FUSE are:
1069 *
1070 * 1) Local access checking ('default_permissions' mount option) based
1071 * on file mode. This is the plain old disk filesystem permission
1072 * modell.
1073 *
1074 * 2) "Remote" access checking, where server is responsible for
1075 * checking permission in each inode operation. An exception to this
1076 * is if ->permission() was invoked from sys_access() in which case an
1077 * access request is sent. Execute permission is still checked
1078 * locally based on file mode.
1079 */
Al Viro10556cb2011-06-20 19:28:19 -04001080static int fuse_permission(struct inode *inode, int mask)
Miklos Szeredie5e55582005-09-09 13:10:28 -07001081{
1082 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredi244f6382007-10-16 23:31:02 -07001083 bool refreshed = false;
1084 int err = 0;
Miklos Szeredie5e55582005-09-09 13:10:28 -07001085
Anatol Pomozovc2132c12013-01-14 22:30:00 -08001086 if (!fuse_allow_current_process(fc))
Miklos Szeredie5e55582005-09-09 13:10:28 -07001087 return -EACCES;
Miklos Szeredi244f6382007-10-16 23:31:02 -07001088
1089 /*
Miklos Szeredie8e96152007-10-16 23:31:06 -07001090 * If attributes are needed, refresh them before proceeding
Miklos Szeredi244f6382007-10-16 23:31:02 -07001091 */
Miklos Szeredie8e96152007-10-16 23:31:06 -07001092 if ((fc->flags & FUSE_DEFAULT_PERMISSIONS) ||
1093 ((mask & MAY_EXEC) && S_ISREG(inode->i_mode))) {
Miklos Szeredi19690dd2011-03-21 13:58:06 +01001094 struct fuse_inode *fi = get_fuse_inode(inode);
1095
Miklos Szeredi126b9d42014-07-07 15:28:50 +02001096 if (time_before64(fi->i_time, get_jiffies_64())) {
Miklos Szeredi19690dd2011-03-21 13:58:06 +01001097 refreshed = true;
1098
Al Viro10556cb2011-06-20 19:28:19 -04001099 err = fuse_perm_getattr(inode, mask);
Miklos Szeredi19690dd2011-03-21 13:58:06 +01001100 if (err)
1101 return err;
1102 }
Miklos Szeredi244f6382007-10-16 23:31:02 -07001103 }
1104
1105 if (fc->flags & FUSE_DEFAULT_PERMISSIONS) {
Al Viro2830ba72011-06-20 19:16:29 -04001106 err = generic_permission(inode, mask);
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -07001107
1108 /* If permission is denied, try to refresh file
1109 attributes. This is also needed, because the root
1110 node will at first have no permissions */
Miklos Szeredi244f6382007-10-16 23:31:02 -07001111 if (err == -EACCES && !refreshed) {
Al Viro10556cb2011-06-20 19:28:19 -04001112 err = fuse_perm_getattr(inode, mask);
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -07001113 if (!err)
Al Viro2830ba72011-06-20 19:16:29 -04001114 err = generic_permission(inode, mask);
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -07001115 }
1116
Miklos Szeredi6f9f1182006-01-06 00:19:39 -08001117 /* Note: the opposite of the above test does not
1118 exist. So if permissions are revoked this won't be
1119 noticed immediately, only after the attribute
1120 timeout has expired */
Eric Paris9cfcac82010-07-23 11:43:51 -04001121 } else if (mask & (MAY_ACCESS | MAY_CHDIR)) {
Miklos Szeredie8e96152007-10-16 23:31:06 -07001122 err = fuse_access(inode, mask);
1123 } else if ((mask & MAY_EXEC) && S_ISREG(inode->i_mode)) {
1124 if (!(inode->i_mode & S_IXUGO)) {
1125 if (refreshed)
1126 return -EACCES;
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -07001127
Al Viro10556cb2011-06-20 19:28:19 -04001128 err = fuse_perm_getattr(inode, mask);
Miklos Szeredie8e96152007-10-16 23:31:06 -07001129 if (!err && !(inode->i_mode & S_IXUGO))
1130 return -EACCES;
1131 }
Miklos Szeredie5e55582005-09-09 13:10:28 -07001132 }
Miklos Szeredi244f6382007-10-16 23:31:02 -07001133 return err;
Miklos Szeredie5e55582005-09-09 13:10:28 -07001134}
1135
1136static int parse_dirfile(char *buf, size_t nbytes, struct file *file,
Al Viro8d3af7f2013-05-18 03:03:58 -04001137 struct dir_context *ctx)
Miklos Szeredie5e55582005-09-09 13:10:28 -07001138{
1139 while (nbytes >= FUSE_NAME_OFFSET) {
1140 struct fuse_dirent *dirent = (struct fuse_dirent *) buf;
1141 size_t reclen = FUSE_DIRENT_SIZE(dirent);
Miklos Szeredie5e55582005-09-09 13:10:28 -07001142 if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX)
1143 return -EIO;
1144 if (reclen > nbytes)
1145 break;
Miklos Szerediefeb9e62013-09-03 14:28:38 +02001146 if (memchr(dirent->name, '/', dirent->namelen) != NULL)
1147 return -EIO;
Miklos Szeredie5e55582005-09-09 13:10:28 -07001148
Al Viro8d3af7f2013-05-18 03:03:58 -04001149 if (!dir_emit(ctx, dirent->name, dirent->namelen,
1150 dirent->ino, dirent->type))
Miklos Szeredie5e55582005-09-09 13:10:28 -07001151 break;
1152
1153 buf += reclen;
1154 nbytes -= reclen;
Al Viro8d3af7f2013-05-18 03:03:58 -04001155 ctx->pos = dirent->off;
Miklos Szeredie5e55582005-09-09 13:10:28 -07001156 }
1157
1158 return 0;
1159}
1160
Anand V. Avati0b05b182012-08-19 08:53:23 -04001161static int fuse_direntplus_link(struct file *file,
1162 struct fuse_direntplus *direntplus,
1163 u64 attr_version)
1164{
1165 int err;
1166 struct fuse_entry_out *o = &direntplus->entry_out;
1167 struct fuse_dirent *dirent = &direntplus->dirent;
1168 struct dentry *parent = file->f_path.dentry;
1169 struct qstr name = QSTR_INIT(dirent->name, dirent->namelen);
1170 struct dentry *dentry;
1171 struct dentry *alias;
David Howells2b0143b2015-03-17 22:25:59 +00001172 struct inode *dir = d_inode(parent);
Anand V. Avati0b05b182012-08-19 08:53:23 -04001173 struct fuse_conn *fc;
1174 struct inode *inode;
1175
1176 if (!o->nodeid) {
1177 /*
1178 * Unlike in the case of fuse_lookup, zero nodeid does not mean
1179 * ENOENT. Instead, it only means the userspace filesystem did
1180 * not want to return attributes/handle for this entry.
1181 *
1182 * So do nothing.
1183 */
1184 return 0;
1185 }
1186
1187 if (name.name[0] == '.') {
1188 /*
1189 * We could potentially refresh the attributes of the directory
1190 * and its parent?
1191 */
1192 if (name.len == 1)
1193 return 0;
1194 if (name.name[1] == '.' && name.len == 2)
1195 return 0;
1196 }
Miklos Szeredia28ef452013-07-17 14:53:53 +02001197
1198 if (invalid_nodeid(o->nodeid))
1199 return -EIO;
1200 if (!fuse_valid_type(o->attr.mode))
1201 return -EIO;
1202
Anand V. Avati0b05b182012-08-19 08:53:23 -04001203 fc = get_fuse_conn(dir);
1204
1205 name.hash = full_name_hash(name.name, name.len);
1206 dentry = d_lookup(parent, &name);
Niels de Vos53ce9a32013-07-17 14:53:53 +02001207 if (dentry) {
David Howells2b0143b2015-03-17 22:25:59 +00001208 inode = d_inode(dentry);
Niels de Vos53ce9a32013-07-17 14:53:53 +02001209 if (!inode) {
1210 d_drop(dentry);
Miklos Szeredia28ef452013-07-17 14:53:53 +02001211 } else if (get_node_id(inode) != o->nodeid ||
1212 ((o->attr.mode ^ inode->i_mode) & S_IFMT)) {
Eric W. Biederman5542aa22014-02-13 09:46:25 -08001213 d_invalidate(dentry);
Miklos Szeredia28ef452013-07-17 14:53:53 +02001214 } else if (is_bad_inode(inode)) {
1215 err = -EIO;
1216 goto out;
Niels de Vos53ce9a32013-07-17 14:53:53 +02001217 } else {
Anand V. Avati0b05b182012-08-19 08:53:23 -04001218 struct fuse_inode *fi;
1219 fi = get_fuse_inode(inode);
1220 spin_lock(&fc->lock);
1221 fi->nlookup++;
1222 spin_unlock(&fc->lock);
1223
Miklos Szeredifa2b7212013-07-17 14:53:53 +02001224 fuse_change_attributes(inode, &o->attr,
1225 entry_attr_timeout(o),
1226 attr_version);
1227
Anand V. Avati0b05b182012-08-19 08:53:23 -04001228 /*
1229 * The other branch to 'found' comes via fuse_iget()
1230 * which bumps nlookup inside
1231 */
1232 goto found;
1233 }
Anand V. Avati0b05b182012-08-19 08:53:23 -04001234 dput(dentry);
Anand V. Avati0b05b182012-08-19 08:53:23 -04001235 }
1236
1237 dentry = d_alloc(parent, &name);
1238 err = -ENOMEM;
1239 if (!dentry)
1240 goto out;
1241
1242 inode = fuse_iget(dir->i_sb, o->nodeid, o->generation,
1243 &o->attr, entry_attr_timeout(o), attr_version);
1244 if (!inode)
1245 goto out;
1246
Al Viro41d28bc2014-10-12 22:24:21 -04001247 alias = d_splice_alias(inode, dentry);
Miklos Szeredi5835f332013-09-05 11:44:42 +02001248 err = PTR_ERR(alias);
1249 if (IS_ERR(alias))
1250 goto out;
Miklos Szeredi29149412013-07-17 14:53:53 +02001251
Anand V. Avati0b05b182012-08-19 08:53:23 -04001252 if (alias) {
1253 dput(dentry);
1254 dentry = alias;
1255 }
1256
1257found:
Miklos Szeredi6314efe2013-10-01 16:41:22 +02001258 if (fc->readdirplus_auto)
1259 set_bit(FUSE_I_INIT_RDPLUS, &get_fuse_inode(inode)->state);
Anand V. Avati0b05b182012-08-19 08:53:23 -04001260 fuse_change_entry_timeout(dentry, o);
1261
1262 err = 0;
1263out:
Miklos Szeredic7263bc2013-07-17 14:53:54 +02001264 dput(dentry);
Anand V. Avati0b05b182012-08-19 08:53:23 -04001265 return err;
1266}
1267
1268static int parse_dirplusfile(char *buf, size_t nbytes, struct file *file,
Al Viro8d3af7f2013-05-18 03:03:58 -04001269 struct dir_context *ctx, u64 attr_version)
Anand V. Avati0b05b182012-08-19 08:53:23 -04001270{
1271 struct fuse_direntplus *direntplus;
1272 struct fuse_dirent *dirent;
1273 size_t reclen;
1274 int over = 0;
1275 int ret;
1276
1277 while (nbytes >= FUSE_NAME_OFFSET_DIRENTPLUS) {
1278 direntplus = (struct fuse_direntplus *) buf;
1279 dirent = &direntplus->dirent;
1280 reclen = FUSE_DIRENTPLUS_SIZE(direntplus);
1281
1282 if (!dirent->namelen || dirent->namelen > FUSE_NAME_MAX)
1283 return -EIO;
1284 if (reclen > nbytes)
1285 break;
Miklos Szerediefeb9e62013-09-03 14:28:38 +02001286 if (memchr(dirent->name, '/', dirent->namelen) != NULL)
1287 return -EIO;
Anand V. Avati0b05b182012-08-19 08:53:23 -04001288
1289 if (!over) {
1290 /* We fill entries into dstbuf only as much as
1291 it can hold. But we still continue iterating
1292 over remaining entries to link them. If not,
1293 we need to send a FORGET for each of those
1294 which we did not link.
1295 */
Al Viro8d3af7f2013-05-18 03:03:58 -04001296 over = !dir_emit(ctx, dirent->name, dirent->namelen,
1297 dirent->ino, dirent->type);
1298 ctx->pos = dirent->off;
Anand V. Avati0b05b182012-08-19 08:53:23 -04001299 }
1300
1301 buf += reclen;
1302 nbytes -= reclen;
1303
1304 ret = fuse_direntplus_link(file, direntplus, attr_version);
1305 if (ret)
1306 fuse_force_forget(file, direntplus->entry_out.nodeid);
1307 }
1308
1309 return 0;
1310}
1311
Al Viro8d3af7f2013-05-18 03:03:58 -04001312static int fuse_readdir(struct file *file, struct dir_context *ctx)
Miklos Szeredie5e55582005-09-09 13:10:28 -07001313{
Feng Shuo4582a4a2013-01-15 11:23:28 +08001314 int plus, err;
Miklos Szeredi04730fe2005-09-09 13:10:36 -07001315 size_t nbytes;
1316 struct page *page;
Al Viro496ad9a2013-01-23 17:07:38 -05001317 struct inode *inode = file_inode(file);
Miklos Szeredi04730fe2005-09-09 13:10:36 -07001318 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredi248d86e2006-01-06 00:19:39 -08001319 struct fuse_req *req;
Anand V. Avati0b05b182012-08-19 08:53:23 -04001320 u64 attr_version = 0;
Miklos Szeredi248d86e2006-01-06 00:19:39 -08001321
1322 if (is_bad_inode(inode))
1323 return -EIO;
1324
Maxim Patlasovb111c8c2012-10-26 19:48:30 +04001325 req = fuse_get_req(fc, 1);
Miklos Szeredice1d5a42006-04-10 22:54:58 -07001326 if (IS_ERR(req))
1327 return PTR_ERR(req);
Miklos Szeredie5e55582005-09-09 13:10:28 -07001328
Miklos Szeredi04730fe2005-09-09 13:10:36 -07001329 page = alloc_page(GFP_KERNEL);
1330 if (!page) {
1331 fuse_put_request(fc, req);
Miklos Szeredie5e55582005-09-09 13:10:28 -07001332 return -ENOMEM;
Miklos Szeredi04730fe2005-09-09 13:10:36 -07001333 }
Feng Shuo4582a4a2013-01-15 11:23:28 +08001334
Al Viro8d3af7f2013-05-18 03:03:58 -04001335 plus = fuse_use_readdirplus(inode, ctx);
Miklos Szeredif4975c62009-04-02 14:25:34 +02001336 req->out.argpages = 1;
Miklos Szeredi04730fe2005-09-09 13:10:36 -07001337 req->num_pages = 1;
1338 req->pages[0] = page;
Maxim Patlasov85f40ae2012-10-26 19:49:33 +04001339 req->page_descs[0].length = PAGE_SIZE;
Feng Shuo4582a4a2013-01-15 11:23:28 +08001340 if (plus) {
Anand V. Avati0b05b182012-08-19 08:53:23 -04001341 attr_version = fuse_get_attr_version(fc);
Al Viro8d3af7f2013-05-18 03:03:58 -04001342 fuse_read_fill(req, file, ctx->pos, PAGE_SIZE,
Anand V. Avati0b05b182012-08-19 08:53:23 -04001343 FUSE_READDIRPLUS);
1344 } else {
Al Viro8d3af7f2013-05-18 03:03:58 -04001345 fuse_read_fill(req, file, ctx->pos, PAGE_SIZE,
Anand V. Avati0b05b182012-08-19 08:53:23 -04001346 FUSE_READDIR);
1347 }
Tejun Heob93f8582008-11-26 12:03:55 +01001348 fuse_request_send(fc, req);
Miklos Szeredi361b1eb52006-01-16 22:14:45 -08001349 nbytes = req->out.args[0].size;
Miklos Szeredi04730fe2005-09-09 13:10:36 -07001350 err = req->out.h.error;
1351 fuse_put_request(fc, req);
Anand V. Avati0b05b182012-08-19 08:53:23 -04001352 if (!err) {
Feng Shuo4582a4a2013-01-15 11:23:28 +08001353 if (plus) {
Anand V. Avati0b05b182012-08-19 08:53:23 -04001354 err = parse_dirplusfile(page_address(page), nbytes,
Al Viro8d3af7f2013-05-18 03:03:58 -04001355 file, ctx,
Anand V. Avati0b05b182012-08-19 08:53:23 -04001356 attr_version);
1357 } else {
1358 err = parse_dirfile(page_address(page), nbytes, file,
Al Viro8d3af7f2013-05-18 03:03:58 -04001359 ctx);
Anand V. Avati0b05b182012-08-19 08:53:23 -04001360 }
1361 }
Miklos Szeredie5e55582005-09-09 13:10:28 -07001362
Miklos Szeredi04730fe2005-09-09 13:10:36 -07001363 __free_page(page);
Andrew Gallagher451418f2013-11-05 03:55:43 -08001364 fuse_invalidate_atime(inode);
Miklos Szeredi04730fe2005-09-09 13:10:36 -07001365 return err;
Miklos Szeredie5e55582005-09-09 13:10:28 -07001366}
1367
Al Viro6e771372015-05-02 13:37:52 -04001368static const char *fuse_follow_link(struct dentry *dentry, void **cookie)
Miklos Szeredie5e55582005-09-09 13:10:28 -07001369{
David Howells2b0143b2015-03-17 22:25:59 +00001370 struct inode *inode = d_inode(dentry);
Miklos Szeredie5e55582005-09-09 13:10:28 -07001371 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredi70781872014-12-12 09:49:05 +01001372 FUSE_ARGS(args);
Miklos Szeredie5e55582005-09-09 13:10:28 -07001373 char *link;
Miklos Szeredi70781872014-12-12 09:49:05 +01001374 ssize_t ret;
Miklos Szeredie5e55582005-09-09 13:10:28 -07001375
1376 link = (char *) __get_free_page(GFP_KERNEL);
Miklos Szeredi70781872014-12-12 09:49:05 +01001377 if (!link)
1378 return ERR_PTR(-ENOMEM);
1379
1380 args.in.h.opcode = FUSE_READLINK;
1381 args.in.h.nodeid = get_node_id(inode);
1382 args.out.argvar = 1;
1383 args.out.numargs = 1;
1384 args.out.args[0].size = PAGE_SIZE - 1;
1385 args.out.args[0].value = link;
1386 ret = fuse_simple_request(fc, &args);
1387 if (ret < 0) {
Miklos Szeredie5e55582005-09-09 13:10:28 -07001388 free_page((unsigned long) link);
Miklos Szeredi70781872014-12-12 09:49:05 +01001389 link = ERR_PTR(ret);
1390 } else {
1391 link[ret] = '\0';
Al Viro680baac2015-05-02 13:32:22 -04001392 *cookie = link;
Miklos Szeredi70781872014-12-12 09:49:05 +01001393 }
Andrew Gallagher451418f2013-11-05 03:55:43 -08001394 fuse_invalidate_atime(inode);
Miklos Szeredie5e55582005-09-09 13:10:28 -07001395 return link;
1396}
1397
Miklos Szeredie5e55582005-09-09 13:10:28 -07001398static int fuse_dir_open(struct inode *inode, struct file *file)
1399{
Miklos Szeredi91fe96b2009-04-28 16:56:37 +02001400 return fuse_open_common(inode, file, true);
Miklos Szeredie5e55582005-09-09 13:10:28 -07001401}
1402
1403static int fuse_dir_release(struct inode *inode, struct file *file)
1404{
Miklos Szeredi8b0797a2009-04-28 16:56:39 +02001405 fuse_release_common(file, FUSE_RELEASEDIR);
1406
1407 return 0;
Miklos Szeredie5e55582005-09-09 13:10:28 -07001408}
1409
Josef Bacik02c24a82011-07-16 20:44:56 -04001410static int fuse_dir_fsync(struct file *file, loff_t start, loff_t end,
1411 int datasync)
Miklos Szeredi82547982005-09-09 13:10:38 -07001412{
Josef Bacik02c24a82011-07-16 20:44:56 -04001413 return fuse_fsync_common(file, start, end, datasync, 1);
Miklos Szeredi82547982005-09-09 13:10:38 -07001414}
1415
Miklos Szeredib18da0c2011-12-13 11:58:49 +01001416static long fuse_dir_ioctl(struct file *file, unsigned int cmd,
1417 unsigned long arg)
1418{
1419 struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host);
1420
1421 /* FUSE_IOCTL_DIR only supported for API version >= 7.18 */
1422 if (fc->minor < 18)
1423 return -ENOTTY;
1424
1425 return fuse_ioctl_common(file, cmd, arg, FUSE_IOCTL_DIR);
1426}
1427
1428static long fuse_dir_compat_ioctl(struct file *file, unsigned int cmd,
1429 unsigned long arg)
1430{
1431 struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host);
1432
1433 if (fc->minor < 18)
1434 return -ENOTTY;
1435
1436 return fuse_ioctl_common(file, cmd, arg,
1437 FUSE_IOCTL_COMPAT | FUSE_IOCTL_DIR);
1438}
1439
Maxim Patlasovb0aa7602013-12-26 19:51:11 +04001440static bool update_mtime(unsigned ivalid, bool trust_local_mtime)
Miklos Szeredi17637cb2007-10-18 03:07:01 -07001441{
1442 /* Always update if mtime is explicitly set */
1443 if (ivalid & ATTR_MTIME_SET)
1444 return true;
1445
Maxim Patlasovb0aa7602013-12-26 19:51:11 +04001446 /* Or if kernel i_mtime is the official one */
1447 if (trust_local_mtime)
1448 return true;
1449
Miklos Szeredi17637cb2007-10-18 03:07:01 -07001450 /* If it's an open(O_TRUNC) or an ftruncate(), don't update */
1451 if ((ivalid & ATTR_SIZE) && (ivalid & (ATTR_OPEN | ATTR_FILE)))
1452 return false;
1453
1454 /* In all other cases update */
1455 return true;
1456}
1457
Maxim Patlasovb0aa7602013-12-26 19:51:11 +04001458static void iattr_to_fattr(struct iattr *iattr, struct fuse_setattr_in *arg,
Maxim Patlasov3ad22c62014-04-28 14:19:25 +02001459 bool trust_local_cmtime)
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001460{
1461 unsigned ivalid = iattr->ia_valid;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001462
1463 if (ivalid & ATTR_MODE)
Miklos Szeredibefc6492005-11-07 00:59:52 -08001464 arg->valid |= FATTR_MODE, arg->mode = iattr->ia_mode;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001465 if (ivalid & ATTR_UID)
Eric W. Biederman499dcf22012-02-07 16:26:03 -08001466 arg->valid |= FATTR_UID, arg->uid = from_kuid(&init_user_ns, iattr->ia_uid);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001467 if (ivalid & ATTR_GID)
Eric W. Biederman499dcf22012-02-07 16:26:03 -08001468 arg->valid |= FATTR_GID, arg->gid = from_kgid(&init_user_ns, iattr->ia_gid);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001469 if (ivalid & ATTR_SIZE)
Miklos Szeredibefc6492005-11-07 00:59:52 -08001470 arg->valid |= FATTR_SIZE, arg->size = iattr->ia_size;
Miklos Szeredi17637cb2007-10-18 03:07:01 -07001471 if (ivalid & ATTR_ATIME) {
1472 arg->valid |= FATTR_ATIME;
Miklos Szeredibefc6492005-11-07 00:59:52 -08001473 arg->atime = iattr->ia_atime.tv_sec;
Miklos Szeredi17637cb2007-10-18 03:07:01 -07001474 arg->atimensec = iattr->ia_atime.tv_nsec;
1475 if (!(ivalid & ATTR_ATIME_SET))
1476 arg->valid |= FATTR_ATIME_NOW;
1477 }
Maxim Patlasov3ad22c62014-04-28 14:19:25 +02001478 if ((ivalid & ATTR_MTIME) && update_mtime(ivalid, trust_local_cmtime)) {
Miklos Szeredi17637cb2007-10-18 03:07:01 -07001479 arg->valid |= FATTR_MTIME;
Miklos Szeredibefc6492005-11-07 00:59:52 -08001480 arg->mtime = iattr->ia_mtime.tv_sec;
Miklos Szeredi17637cb2007-10-18 03:07:01 -07001481 arg->mtimensec = iattr->ia_mtime.tv_nsec;
Maxim Patlasov3ad22c62014-04-28 14:19:25 +02001482 if (!(ivalid & ATTR_MTIME_SET) && !trust_local_cmtime)
Miklos Szeredi17637cb2007-10-18 03:07:01 -07001483 arg->valid |= FATTR_MTIME_NOW;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001484 }
Maxim Patlasov3ad22c62014-04-28 14:19:25 +02001485 if ((ivalid & ATTR_CTIME) && trust_local_cmtime) {
1486 arg->valid |= FATTR_CTIME;
1487 arg->ctime = iattr->ia_ctime.tv_sec;
1488 arg->ctimensec = iattr->ia_ctime.tv_nsec;
1489 }
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001490}
1491
Miklos Szeredi6f9f1182006-01-06 00:19:39 -08001492/*
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001493 * Prevent concurrent writepages on inode
1494 *
1495 * This is done by adding a negative bias to the inode write counter
1496 * and waiting for all pending writes to finish.
1497 */
1498void fuse_set_nowrite(struct inode *inode)
1499{
1500 struct fuse_conn *fc = get_fuse_conn(inode);
1501 struct fuse_inode *fi = get_fuse_inode(inode);
1502
1503 BUG_ON(!mutex_is_locked(&inode->i_mutex));
1504
1505 spin_lock(&fc->lock);
1506 BUG_ON(fi->writectr < 0);
1507 fi->writectr += FUSE_NOWRITE;
1508 spin_unlock(&fc->lock);
1509 wait_event(fi->page_waitq, fi->writectr == FUSE_NOWRITE);
1510}
1511
1512/*
1513 * Allow writepages on inode
1514 *
1515 * Remove the bias from the writecounter and send any queued
1516 * writepages.
1517 */
1518static void __fuse_release_nowrite(struct inode *inode)
1519{
1520 struct fuse_inode *fi = get_fuse_inode(inode);
1521
1522 BUG_ON(fi->writectr != FUSE_NOWRITE);
1523 fi->writectr = 0;
1524 fuse_flush_writepages(inode);
1525}
1526
1527void fuse_release_nowrite(struct inode *inode)
1528{
1529 struct fuse_conn *fc = get_fuse_conn(inode);
1530
1531 spin_lock(&fc->lock);
1532 __fuse_release_nowrite(inode);
1533 spin_unlock(&fc->lock);
1534}
1535
Miklos Szeredi70781872014-12-12 09:49:05 +01001536static void fuse_setattr_fill(struct fuse_conn *fc, struct fuse_args *args,
Maxim Patlasovb0aa7602013-12-26 19:51:11 +04001537 struct inode *inode,
1538 struct fuse_setattr_in *inarg_p,
1539 struct fuse_attr_out *outarg_p)
1540{
Miklos Szeredi70781872014-12-12 09:49:05 +01001541 args->in.h.opcode = FUSE_SETATTR;
1542 args->in.h.nodeid = get_node_id(inode);
1543 args->in.numargs = 1;
1544 args->in.args[0].size = sizeof(*inarg_p);
1545 args->in.args[0].value = inarg_p;
1546 args->out.numargs = 1;
Miklos Szeredi21f62172015-01-06 10:45:35 +01001547 args->out.args[0].size = sizeof(*outarg_p);
Miklos Szeredi70781872014-12-12 09:49:05 +01001548 args->out.args[0].value = outarg_p;
Maxim Patlasovb0aa7602013-12-26 19:51:11 +04001549}
1550
1551/*
1552 * Flush inode->i_mtime to the server
1553 */
Maxim Patlasovab9e13f2014-04-28 14:19:24 +02001554int fuse_flush_times(struct inode *inode, struct fuse_file *ff)
Maxim Patlasovb0aa7602013-12-26 19:51:11 +04001555{
Maxim Patlasovb0aa7602013-12-26 19:51:11 +04001556 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredi70781872014-12-12 09:49:05 +01001557 FUSE_ARGS(args);
Maxim Patlasovb0aa7602013-12-26 19:51:11 +04001558 struct fuse_setattr_in inarg;
1559 struct fuse_attr_out outarg;
Maxim Patlasovb0aa7602013-12-26 19:51:11 +04001560
1561 memset(&inarg, 0, sizeof(inarg));
1562 memset(&outarg, 0, sizeof(outarg));
1563
Maxim Patlasovab9e13f2014-04-28 14:19:24 +02001564 inarg.valid = FATTR_MTIME;
Maxim Patlasovb0aa7602013-12-26 19:51:11 +04001565 inarg.mtime = inode->i_mtime.tv_sec;
1566 inarg.mtimensec = inode->i_mtime.tv_nsec;
Maxim Patlasovab9e13f2014-04-28 14:19:24 +02001567 if (fc->minor >= 23) {
1568 inarg.valid |= FATTR_CTIME;
1569 inarg.ctime = inode->i_ctime.tv_sec;
1570 inarg.ctimensec = inode->i_ctime.tv_nsec;
1571 }
Miklos Szeredi1e18bda2014-04-28 14:19:23 +02001572 if (ff) {
1573 inarg.valid |= FATTR_FH;
1574 inarg.fh = ff->fh;
1575 }
Miklos Szeredi70781872014-12-12 09:49:05 +01001576 fuse_setattr_fill(fc, &args, inode, &inarg, &outarg);
Maxim Patlasovb0aa7602013-12-26 19:51:11 +04001577
Miklos Szeredi70781872014-12-12 09:49:05 +01001578 return fuse_simple_request(fc, &args);
Maxim Patlasovb0aa7602013-12-26 19:51:11 +04001579}
1580
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001581/*
Miklos Szeredi6f9f1182006-01-06 00:19:39 -08001582 * Set attributes, and at the same time refresh them.
1583 *
1584 * Truncation is slightly complicated, because the 'truncate' request
1585 * may fail, in which case we don't want to touch the mapping.
Miklos Szeredi9ffbb912006-10-17 00:10:06 -07001586 * vmtruncate() doesn't allow for this case, so do the rlimit checking
1587 * and the actual truncation by hand.
Miklos Szeredi6f9f1182006-01-06 00:19:39 -08001588 */
Maxim Patlasovefb9fa92012-12-18 14:05:08 +04001589int fuse_do_setattr(struct inode *inode, struct iattr *attr,
1590 struct file *file)
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001591{
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001592 struct fuse_conn *fc = get_fuse_conn(inode);
Maxim Patlasov06a7c3c2013-08-30 17:06:04 +04001593 struct fuse_inode *fi = get_fuse_inode(inode);
Miklos Szeredi70781872014-12-12 09:49:05 +01001594 FUSE_ARGS(args);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001595 struct fuse_setattr_in inarg;
1596 struct fuse_attr_out outarg;
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001597 bool is_truncate = false;
Pavel Emelyanov83732002013-10-10 17:10:46 +04001598 bool is_wb = fc->writeback_cache;
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001599 loff_t oldsize;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001600 int err;
Maxim Patlasov3ad22c62014-04-28 14:19:25 +02001601 bool trust_local_cmtime = is_wb && S_ISREG(inode->i_mode);
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001602
Christoph Hellwigdb78b872010-06-04 11:30:03 +02001603 if (!(fc->flags & FUSE_DEFAULT_PERMISSIONS))
1604 attr->ia_valid |= ATTR_FORCE;
1605
1606 err = inode_change_ok(inode, attr);
1607 if (err)
1608 return err;
Miklos Szeredi1e9a4ed2005-09-09 13:10:31 -07001609
Miklos Szeredi8d56add2011-02-25 14:44:58 +01001610 if (attr->ia_valid & ATTR_OPEN) {
1611 if (fc->atomic_o_trunc)
1612 return 0;
1613 file = NULL;
1614 }
Miklos Szeredi6ff958e2007-10-18 03:07:02 -07001615
Christoph Hellwig2c27c652010-06-04 11:30:04 +02001616 if (attr->ia_valid & ATTR_SIZE)
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001617 is_truncate = true;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001618
Maxim Patlasov06a7c3c2013-08-30 17:06:04 +04001619 if (is_truncate) {
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001620 fuse_set_nowrite(inode);
Maxim Patlasov06a7c3c2013-08-30 17:06:04 +04001621 set_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
Maxim Patlasov3ad22c62014-04-28 14:19:25 +02001622 if (trust_local_cmtime && attr->ia_size != inode->i_size)
1623 attr->ia_valid |= ATTR_MTIME | ATTR_CTIME;
Maxim Patlasov06a7c3c2013-08-30 17:06:04 +04001624 }
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001625
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001626 memset(&inarg, 0, sizeof(inarg));
Miklos Szeredi0e9663e2007-10-18 03:07:05 -07001627 memset(&outarg, 0, sizeof(outarg));
Maxim Patlasov3ad22c62014-04-28 14:19:25 +02001628 iattr_to_fattr(attr, &inarg, trust_local_cmtime);
Miklos Szeredi49d49142007-10-18 03:07:00 -07001629 if (file) {
1630 struct fuse_file *ff = file->private_data;
1631 inarg.valid |= FATTR_FH;
1632 inarg.fh = ff->fh;
1633 }
Miklos Szeredif3332112007-10-18 03:07:04 -07001634 if (attr->ia_valid & ATTR_SIZE) {
1635 /* For mandatory locking in truncate */
1636 inarg.valid |= FATTR_LOCKOWNER;
1637 inarg.lock_owner = fuse_lock_owner_id(fc, current->files);
1638 }
Miklos Szeredi70781872014-12-12 09:49:05 +01001639 fuse_setattr_fill(fc, &args, inode, &inarg, &outarg);
1640 err = fuse_simple_request(fc, &args);
Miklos Szeredie00d2c22007-10-16 23:31:01 -07001641 if (err) {
1642 if (err == -EINTR)
1643 fuse_invalidate_attr(inode);
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001644 goto error;
Miklos Szeredie00d2c22007-10-16 23:31:01 -07001645 }
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001646
Miklos Szeredie00d2c22007-10-16 23:31:01 -07001647 if ((inode->i_mode ^ outarg.attr.mode) & S_IFMT) {
1648 make_bad_inode(inode);
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001649 err = -EIO;
1650 goto error;
Miklos Szeredie00d2c22007-10-16 23:31:01 -07001651 }
1652
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001653 spin_lock(&fc->lock);
Maxim Patlasovb0aa7602013-12-26 19:51:11 +04001654 /* the kernel maintains i_mtime locally */
Maxim Patlasov3ad22c62014-04-28 14:19:25 +02001655 if (trust_local_cmtime) {
1656 if (attr->ia_valid & ATTR_MTIME)
1657 inode->i_mtime = attr->ia_mtime;
1658 if (attr->ia_valid & ATTR_CTIME)
1659 inode->i_ctime = attr->ia_ctime;
Miklos Szeredi1e18bda2014-04-28 14:19:23 +02001660 /* FIXME: clear I_DIRTY_SYNC? */
Maxim Patlasovb0aa7602013-12-26 19:51:11 +04001661 }
1662
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001663 fuse_change_attributes_common(inode, &outarg.attr,
1664 attr_timeout(&outarg));
1665 oldsize = inode->i_size;
Pavel Emelyanov83732002013-10-10 17:10:46 +04001666 /* see the comment in fuse_change_attributes() */
1667 if (!is_wb || is_truncate || !S_ISREG(inode->i_mode))
1668 i_size_write(inode, outarg.attr.size);
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001669
1670 if (is_truncate) {
1671 /* NOTE: this may release/reacquire fc->lock */
1672 __fuse_release_nowrite(inode);
1673 }
1674 spin_unlock(&fc->lock);
1675
1676 /*
1677 * Only call invalidate_inode_pages2() after removing
1678 * FUSE_NOWRITE, otherwise fuse_launder_page() would deadlock.
1679 */
Pavel Emelyanov83732002013-10-10 17:10:46 +04001680 if ((is_truncate || !is_wb) &&
1681 S_ISREG(inode->i_mode) && oldsize != outarg.attr.size) {
Kirill A. Shutemov7caef262013-09-12 15:13:56 -07001682 truncate_pagecache(inode, outarg.attr.size);
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001683 invalidate_inode_pages2(inode->i_mapping);
1684 }
1685
Maxim Patlasov06a7c3c2013-08-30 17:06:04 +04001686 clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
Miklos Szeredie00d2c22007-10-16 23:31:01 -07001687 return 0;
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001688
1689error:
1690 if (is_truncate)
1691 fuse_release_nowrite(inode);
1692
Maxim Patlasov06a7c3c2013-08-30 17:06:04 +04001693 clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
Miklos Szeredi3be5a522008-04-30 00:54:41 -07001694 return err;
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001695}
1696
Miklos Szeredi49d49142007-10-18 03:07:00 -07001697static int fuse_setattr(struct dentry *entry, struct iattr *attr)
1698{
David Howells2b0143b2015-03-17 22:25:59 +00001699 struct inode *inode = d_inode(entry);
Maxim Patlasovefb9fa92012-12-18 14:05:08 +04001700
1701 if (!fuse_allow_current_process(get_fuse_conn(inode)))
1702 return -EACCES;
1703
Miklos Szeredi49d49142007-10-18 03:07:00 -07001704 if (attr->ia_valid & ATTR_FILE)
Maxim Patlasovefb9fa92012-12-18 14:05:08 +04001705 return fuse_do_setattr(inode, attr, attr->ia_file);
Miklos Szeredi49d49142007-10-18 03:07:00 -07001706 else
Maxim Patlasovefb9fa92012-12-18 14:05:08 +04001707 return fuse_do_setattr(inode, attr, NULL);
Miklos Szeredi49d49142007-10-18 03:07:00 -07001708}
1709
Miklos Szeredie5e55582005-09-09 13:10:28 -07001710static int fuse_getattr(struct vfsmount *mnt, struct dentry *entry,
1711 struct kstat *stat)
1712{
David Howells2b0143b2015-03-17 22:25:59 +00001713 struct inode *inode = d_inode(entry);
Miklos Szeredi244f6382007-10-16 23:31:02 -07001714 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredi244f6382007-10-16 23:31:02 -07001715
Anatol Pomozovc2132c12013-01-14 22:30:00 -08001716 if (!fuse_allow_current_process(fc))
Miklos Szeredi244f6382007-10-16 23:31:02 -07001717 return -EACCES;
1718
Miklos Szeredibcb4be82007-11-28 16:21:59 -08001719 return fuse_update_attributes(inode, stat, NULL, NULL);
Miklos Szeredie5e55582005-09-09 13:10:28 -07001720}
1721
Miklos Szeredi92a87802005-09-09 13:10:31 -07001722static int fuse_setxattr(struct dentry *entry, const char *name,
1723 const void *value, size_t size, int flags)
1724{
David Howells2b0143b2015-03-17 22:25:59 +00001725 struct inode *inode = d_inode(entry);
Miklos Szeredi92a87802005-09-09 13:10:31 -07001726 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredi70781872014-12-12 09:49:05 +01001727 FUSE_ARGS(args);
Miklos Szeredi92a87802005-09-09 13:10:31 -07001728 struct fuse_setxattr_in inarg;
1729 int err;
1730
Miklos Szeredi92a87802005-09-09 13:10:31 -07001731 if (fc->no_setxattr)
1732 return -EOPNOTSUPP;
1733
Miklos Szeredi92a87802005-09-09 13:10:31 -07001734 memset(&inarg, 0, sizeof(inarg));
1735 inarg.size = size;
1736 inarg.flags = flags;
Miklos Szeredi70781872014-12-12 09:49:05 +01001737 args.in.h.opcode = FUSE_SETXATTR;
1738 args.in.h.nodeid = get_node_id(inode);
1739 args.in.numargs = 3;
1740 args.in.args[0].size = sizeof(inarg);
1741 args.in.args[0].value = &inarg;
1742 args.in.args[1].size = strlen(name) + 1;
1743 args.in.args[1].value = name;
1744 args.in.args[2].size = size;
1745 args.in.args[2].value = value;
1746 err = fuse_simple_request(fc, &args);
Miklos Szeredi92a87802005-09-09 13:10:31 -07001747 if (err == -ENOSYS) {
1748 fc->no_setxattr = 1;
1749 err = -EOPNOTSUPP;
1750 }
Maxim Patlasov31f32672014-04-28 14:19:24 +02001751 if (!err) {
Anand Avatid331a412013-08-20 02:21:07 -04001752 fuse_invalidate_attr(inode);
Maxim Patlasov31f32672014-04-28 14:19:24 +02001753 fuse_update_ctime(inode);
1754 }
Miklos Szeredi92a87802005-09-09 13:10:31 -07001755 return err;
1756}
1757
1758static ssize_t fuse_getxattr(struct dentry *entry, const char *name,
1759 void *value, size_t size)
1760{
David Howells2b0143b2015-03-17 22:25:59 +00001761 struct inode *inode = d_inode(entry);
Miklos Szeredi92a87802005-09-09 13:10:31 -07001762 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredi70781872014-12-12 09:49:05 +01001763 FUSE_ARGS(args);
Miklos Szeredi92a87802005-09-09 13:10:31 -07001764 struct fuse_getxattr_in inarg;
1765 struct fuse_getxattr_out outarg;
1766 ssize_t ret;
1767
1768 if (fc->no_getxattr)
1769 return -EOPNOTSUPP;
1770
Miklos Szeredi92a87802005-09-09 13:10:31 -07001771 memset(&inarg, 0, sizeof(inarg));
1772 inarg.size = size;
Miklos Szeredi70781872014-12-12 09:49:05 +01001773 args.in.h.opcode = FUSE_GETXATTR;
1774 args.in.h.nodeid = get_node_id(inode);
1775 args.in.numargs = 2;
1776 args.in.args[0].size = sizeof(inarg);
1777 args.in.args[0].value = &inarg;
1778 args.in.args[1].size = strlen(name) + 1;
1779 args.in.args[1].value = name;
Miklos Szeredi92a87802005-09-09 13:10:31 -07001780 /* This is really two different operations rolled into one */
Miklos Szeredi70781872014-12-12 09:49:05 +01001781 args.out.numargs = 1;
Miklos Szeredi92a87802005-09-09 13:10:31 -07001782 if (size) {
Miklos Szeredi70781872014-12-12 09:49:05 +01001783 args.out.argvar = 1;
1784 args.out.args[0].size = size;
1785 args.out.args[0].value = value;
Miklos Szeredi92a87802005-09-09 13:10:31 -07001786 } else {
Miklos Szeredi70781872014-12-12 09:49:05 +01001787 args.out.args[0].size = sizeof(outarg);
1788 args.out.args[0].value = &outarg;
Miklos Szeredi92a87802005-09-09 13:10:31 -07001789 }
Miklos Szeredi70781872014-12-12 09:49:05 +01001790 ret = fuse_simple_request(fc, &args);
1791 if (!ret && !size)
1792 ret = outarg.size;
1793 if (ret == -ENOSYS) {
1794 fc->no_getxattr = 1;
1795 ret = -EOPNOTSUPP;
Miklos Szeredi92a87802005-09-09 13:10:31 -07001796 }
Miklos Szeredi92a87802005-09-09 13:10:31 -07001797 return ret;
1798}
1799
1800static ssize_t fuse_listxattr(struct dentry *entry, char *list, size_t size)
1801{
David Howells2b0143b2015-03-17 22:25:59 +00001802 struct inode *inode = d_inode(entry);
Miklos Szeredi92a87802005-09-09 13:10:31 -07001803 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredi70781872014-12-12 09:49:05 +01001804 FUSE_ARGS(args);
Miklos Szeredi92a87802005-09-09 13:10:31 -07001805 struct fuse_getxattr_in inarg;
1806 struct fuse_getxattr_out outarg;
1807 ssize_t ret;
1808
Anatol Pomozovc2132c12013-01-14 22:30:00 -08001809 if (!fuse_allow_current_process(fc))
Miklos Szeredie57ac682007-10-18 03:06:58 -07001810 return -EACCES;
1811
Miklos Szeredi92a87802005-09-09 13:10:31 -07001812 if (fc->no_listxattr)
1813 return -EOPNOTSUPP;
1814
Miklos Szeredi92a87802005-09-09 13:10:31 -07001815 memset(&inarg, 0, sizeof(inarg));
1816 inarg.size = size;
Miklos Szeredi70781872014-12-12 09:49:05 +01001817 args.in.h.opcode = FUSE_LISTXATTR;
1818 args.in.h.nodeid = get_node_id(inode);
1819 args.in.numargs = 1;
1820 args.in.args[0].size = sizeof(inarg);
1821 args.in.args[0].value = &inarg;
Miklos Szeredi92a87802005-09-09 13:10:31 -07001822 /* This is really two different operations rolled into one */
Miklos Szeredi70781872014-12-12 09:49:05 +01001823 args.out.numargs = 1;
Miklos Szeredi92a87802005-09-09 13:10:31 -07001824 if (size) {
Miklos Szeredi70781872014-12-12 09:49:05 +01001825 args.out.argvar = 1;
1826 args.out.args[0].size = size;
1827 args.out.args[0].value = list;
Miklos Szeredi92a87802005-09-09 13:10:31 -07001828 } else {
Miklos Szeredi70781872014-12-12 09:49:05 +01001829 args.out.args[0].size = sizeof(outarg);
1830 args.out.args[0].value = &outarg;
Miklos Szeredi92a87802005-09-09 13:10:31 -07001831 }
Miklos Szeredi70781872014-12-12 09:49:05 +01001832 ret = fuse_simple_request(fc, &args);
1833 if (!ret && !size)
1834 ret = outarg.size;
1835 if (ret == -ENOSYS) {
1836 fc->no_listxattr = 1;
1837 ret = -EOPNOTSUPP;
Miklos Szeredi92a87802005-09-09 13:10:31 -07001838 }
Miklos Szeredi92a87802005-09-09 13:10:31 -07001839 return ret;
1840}
1841
1842static int fuse_removexattr(struct dentry *entry, const char *name)
1843{
David Howells2b0143b2015-03-17 22:25:59 +00001844 struct inode *inode = d_inode(entry);
Miklos Szeredi92a87802005-09-09 13:10:31 -07001845 struct fuse_conn *fc = get_fuse_conn(inode);
Miklos Szeredi70781872014-12-12 09:49:05 +01001846 FUSE_ARGS(args);
Miklos Szeredi92a87802005-09-09 13:10:31 -07001847 int err;
1848
1849 if (fc->no_removexattr)
1850 return -EOPNOTSUPP;
1851
Miklos Szeredi70781872014-12-12 09:49:05 +01001852 args.in.h.opcode = FUSE_REMOVEXATTR;
1853 args.in.h.nodeid = get_node_id(inode);
1854 args.in.numargs = 1;
1855 args.in.args[0].size = strlen(name) + 1;
1856 args.in.args[0].value = name;
1857 err = fuse_simple_request(fc, &args);
Miklos Szeredi92a87802005-09-09 13:10:31 -07001858 if (err == -ENOSYS) {
1859 fc->no_removexattr = 1;
1860 err = -EOPNOTSUPP;
1861 }
Maxim Patlasov31f32672014-04-28 14:19:24 +02001862 if (!err) {
Anand Avatid331a412013-08-20 02:21:07 -04001863 fuse_invalidate_attr(inode);
Maxim Patlasov31f32672014-04-28 14:19:24 +02001864 fuse_update_ctime(inode);
1865 }
Miklos Szeredi92a87802005-09-09 13:10:31 -07001866 return err;
1867}
1868
Arjan van de Ven754661f2007-02-12 00:55:38 -08001869static const struct inode_operations fuse_dir_inode_operations = {
Miklos Szeredie5e55582005-09-09 13:10:28 -07001870 .lookup = fuse_lookup,
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001871 .mkdir = fuse_mkdir,
1872 .symlink = fuse_symlink,
1873 .unlink = fuse_unlink,
1874 .rmdir = fuse_rmdir,
Miklos Szeredi1560c972014-04-28 16:43:44 +02001875 .rename2 = fuse_rename2,
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001876 .link = fuse_link,
1877 .setattr = fuse_setattr,
1878 .create = fuse_create,
Miklos Szeredic8ccbe02012-06-05 15:10:22 +02001879 .atomic_open = fuse_atomic_open,
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001880 .mknod = fuse_mknod,
Miklos Szeredie5e55582005-09-09 13:10:28 -07001881 .permission = fuse_permission,
1882 .getattr = fuse_getattr,
Miklos Szeredi92a87802005-09-09 13:10:31 -07001883 .setxattr = fuse_setxattr,
1884 .getxattr = fuse_getxattr,
1885 .listxattr = fuse_listxattr,
1886 .removexattr = fuse_removexattr,
Miklos Szeredie5e55582005-09-09 13:10:28 -07001887};
1888
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08001889static const struct file_operations fuse_dir_operations = {
Miklos Szeredib6aeade2005-09-09 13:10:30 -07001890 .llseek = generic_file_llseek,
Miklos Szeredie5e55582005-09-09 13:10:28 -07001891 .read = generic_read_dir,
Al Viro8d3af7f2013-05-18 03:03:58 -04001892 .iterate = fuse_readdir,
Miklos Szeredie5e55582005-09-09 13:10:28 -07001893 .open = fuse_dir_open,
1894 .release = fuse_dir_release,
Miklos Szeredi82547982005-09-09 13:10:38 -07001895 .fsync = fuse_dir_fsync,
Miklos Szeredib18da0c2011-12-13 11:58:49 +01001896 .unlocked_ioctl = fuse_dir_ioctl,
1897 .compat_ioctl = fuse_dir_compat_ioctl,
Miklos Szeredie5e55582005-09-09 13:10:28 -07001898};
1899
Arjan van de Ven754661f2007-02-12 00:55:38 -08001900static const struct inode_operations fuse_common_inode_operations = {
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001901 .setattr = fuse_setattr,
Miklos Szeredie5e55582005-09-09 13:10:28 -07001902 .permission = fuse_permission,
1903 .getattr = fuse_getattr,
Miklos Szeredi92a87802005-09-09 13:10:31 -07001904 .setxattr = fuse_setxattr,
1905 .getxattr = fuse_getxattr,
1906 .listxattr = fuse_listxattr,
1907 .removexattr = fuse_removexattr,
Miklos Szeredie5e55582005-09-09 13:10:28 -07001908};
1909
Arjan van de Ven754661f2007-02-12 00:55:38 -08001910static const struct inode_operations fuse_symlink_inode_operations = {
Miklos Szeredi9e6268d2005-09-09 13:10:29 -07001911 .setattr = fuse_setattr,
Miklos Szeredie5e55582005-09-09 13:10:28 -07001912 .follow_link = fuse_follow_link,
Al Viroecc087f2015-05-07 11:19:14 -04001913 .put_link = free_page_put_link,
Miklos Szeredie5e55582005-09-09 13:10:28 -07001914 .readlink = generic_readlink,
1915 .getattr = fuse_getattr,
Miklos Szeredi92a87802005-09-09 13:10:31 -07001916 .setxattr = fuse_setxattr,
1917 .getxattr = fuse_getxattr,
1918 .listxattr = fuse_listxattr,
1919 .removexattr = fuse_removexattr,
Miklos Szeredie5e55582005-09-09 13:10:28 -07001920};
1921
1922void fuse_init_common(struct inode *inode)
1923{
1924 inode->i_op = &fuse_common_inode_operations;
1925}
1926
1927void fuse_init_dir(struct inode *inode)
1928{
1929 inode->i_op = &fuse_dir_inode_operations;
1930 inode->i_fop = &fuse_dir_operations;
1931}
1932
1933void fuse_init_symlink(struct inode *inode)
1934{
1935 inode->i_op = &fuse_symlink_inode_operations;
1936}