1 /* 1 /*
2 FUSE: Filesystem in Userspace 2 FUSE: Filesystem in Userspace
3 Copyright (C) 2001-2008 Miklos Szeredi <mik 3 Copyright (C) 2001-2008 Miklos Szeredi <miklos@szeredi.hu>
4 4
5 This program can be distributed under the te 5 This program can be distributed under the terms of the GNU GPL.
6 See the file COPYING. 6 See the file COPYING.
7 */ 7 */
8 8
9 #include "fuse_i.h" 9 #include "fuse_i.h"
10 10
11 #include <linux/pagemap.h> 11 #include <linux/pagemap.h>
12 #include <linux/file.h> 12 #include <linux/file.h>
13 #include <linux/fs_context.h> 13 #include <linux/fs_context.h>
14 #include <linux/moduleparam.h> 14 #include <linux/moduleparam.h>
15 #include <linux/sched.h> 15 #include <linux/sched.h>
16 #include <linux/namei.h> 16 #include <linux/namei.h>
17 #include <linux/slab.h> 17 #include <linux/slab.h>
18 #include <linux/xattr.h> 18 #include <linux/xattr.h>
19 #include <linux/iversion.h> 19 #include <linux/iversion.h>
20 #include <linux/posix_acl.h> 20 #include <linux/posix_acl.h>
21 #include <linux/security.h> 21 #include <linux/security.h>
22 #include <linux/types.h> 22 #include <linux/types.h>
23 #include <linux/kernel.h> 23 #include <linux/kernel.h>
24 24
25 static bool __read_mostly allow_sys_admin_acce 25 static bool __read_mostly allow_sys_admin_access;
26 module_param(allow_sys_admin_access, bool, 064 26 module_param(allow_sys_admin_access, bool, 0644);
27 MODULE_PARM_DESC(allow_sys_admin_access, 27 MODULE_PARM_DESC(allow_sys_admin_access,
28 "Allow users with CAP_SYS_ADM 28 "Allow users with CAP_SYS_ADMIN in initial userns to bypass allow_other access check");
29 29
30 static void fuse_advise_use_readdirplus(struct 30 static void fuse_advise_use_readdirplus(struct inode *dir)
31 { 31 {
32 struct fuse_inode *fi = get_fuse_inode 32 struct fuse_inode *fi = get_fuse_inode(dir);
33 33
34 set_bit(FUSE_I_ADVISE_RDPLUS, &fi->sta 34 set_bit(FUSE_I_ADVISE_RDPLUS, &fi->state);
35 } 35 }
36 36
37 #if BITS_PER_LONG >= 64 37 #if BITS_PER_LONG >= 64
38 static inline void __fuse_dentry_settime(struc 38 static inline void __fuse_dentry_settime(struct dentry *entry, u64 time)
39 { 39 {
40 entry->d_fsdata = (void *) time; 40 entry->d_fsdata = (void *) time;
41 } 41 }
42 42
43 static inline u64 fuse_dentry_time(const struc 43 static inline u64 fuse_dentry_time(const struct dentry *entry)
44 { 44 {
45 return (u64)entry->d_fsdata; 45 return (u64)entry->d_fsdata;
46 } 46 }
47 47
48 #else 48 #else
49 union fuse_dentry { 49 union fuse_dentry {
50 u64 time; 50 u64 time;
51 struct rcu_head rcu; 51 struct rcu_head rcu;
52 }; 52 };
53 53
54 static inline void __fuse_dentry_settime(struc 54 static inline void __fuse_dentry_settime(struct dentry *dentry, u64 time)
55 { 55 {
56 ((union fuse_dentry *) dentry->d_fsdat 56 ((union fuse_dentry *) dentry->d_fsdata)->time = time;
57 } 57 }
58 58
59 static inline u64 fuse_dentry_time(const struc 59 static inline u64 fuse_dentry_time(const struct dentry *entry)
60 { 60 {
61 return ((union fuse_dentry *) entry->d 61 return ((union fuse_dentry *) entry->d_fsdata)->time;
62 } 62 }
63 #endif 63 #endif
64 64
65 static void fuse_dentry_settime(struct dentry 65 static void fuse_dentry_settime(struct dentry *dentry, u64 time)
66 { 66 {
67 struct fuse_conn *fc = get_fuse_conn_s 67 struct fuse_conn *fc = get_fuse_conn_super(dentry->d_sb);
68 bool delete = !time && fc->delete_stal 68 bool delete = !time && fc->delete_stale;
69 /* 69 /*
70 * Mess with DCACHE_OP_DELETE because 70 * Mess with DCACHE_OP_DELETE because dput() will be faster without it.
71 * Don't care about races, either way 71 * Don't care about races, either way it's just an optimization
72 */ 72 */
73 if ((!delete && (dentry->d_flags & DCA 73 if ((!delete && (dentry->d_flags & DCACHE_OP_DELETE)) ||
74 (delete && !(dentry->d_flags & DCA 74 (delete && !(dentry->d_flags & DCACHE_OP_DELETE))) {
75 spin_lock(&dentry->d_lock); 75 spin_lock(&dentry->d_lock);
76 if (!delete) 76 if (!delete)
77 dentry->d_flags &= ~DC 77 dentry->d_flags &= ~DCACHE_OP_DELETE;
78 else 78 else
79 dentry->d_flags |= DCA 79 dentry->d_flags |= DCACHE_OP_DELETE;
80 spin_unlock(&dentry->d_lock); 80 spin_unlock(&dentry->d_lock);
81 } 81 }
82 82
83 __fuse_dentry_settime(dentry, time); 83 __fuse_dentry_settime(dentry, time);
84 } 84 }
85 85
86 /* 86 /*
87 * FUSE caches dentries and attributes with se 87 * FUSE caches dentries and attributes with separate timeout. The
88 * time in jiffies until the dentry/attributes 88 * time in jiffies until the dentry/attributes are valid is stored in
89 * dentry->d_fsdata and fuse_inode->i_time res 89 * dentry->d_fsdata and fuse_inode->i_time respectively.
90 */ 90 */
91 91
92 /* 92 /*
93 * Calculate the time in jiffies until a dentr 93 * Calculate the time in jiffies until a dentry/attributes are valid
94 */ 94 */
95 u64 fuse_time_to_jiffies(u64 sec, u32 nsec) !! 95 static u64 time_to_jiffies(u64 sec, u32 nsec)
96 { 96 {
97 if (sec || nsec) { 97 if (sec || nsec) {
98 struct timespec64 ts = { 98 struct timespec64 ts = {
99 sec, 99 sec,
100 min_t(u32, nsec, NSEC_ 100 min_t(u32, nsec, NSEC_PER_SEC - 1)
101 }; 101 };
102 102
103 return get_jiffies_64() + time 103 return get_jiffies_64() + timespec64_to_jiffies(&ts);
104 } else 104 } else
105 return 0; 105 return 0;
106 } 106 }
107 107
108 /* 108 /*
109 * Set dentry and possibly attribute timeouts 109 * Set dentry and possibly attribute timeouts from the lookup/mk*
110 * replies 110 * replies
111 */ 111 */
112 void fuse_change_entry_timeout(struct dentry * 112 void fuse_change_entry_timeout(struct dentry *entry, struct fuse_entry_out *o)
113 { 113 {
114 fuse_dentry_settime(entry, 114 fuse_dentry_settime(entry,
115 fuse_time_to_jiffies(o->entry_ !! 115 time_to_jiffies(o->entry_valid, o->entry_valid_nsec));
>> 116 }
>> 117
>> 118 static u64 attr_timeout(struct fuse_attr_out *o)
>> 119 {
>> 120 return time_to_jiffies(o->attr_valid, o->attr_valid_nsec);
>> 121 }
>> 122
>> 123 u64 entry_attr_timeout(struct fuse_entry_out *o)
>> 124 {
>> 125 return time_to_jiffies(o->attr_valid, o->attr_valid_nsec);
116 } 126 }
117 127
118 void fuse_invalidate_attr_mask(struct inode *i 128 void fuse_invalidate_attr_mask(struct inode *inode, u32 mask)
119 { 129 {
120 set_mask_bits(&get_fuse_inode(inode)-> 130 set_mask_bits(&get_fuse_inode(inode)->inval_mask, 0, mask);
121 } 131 }
122 132
123 /* 133 /*
124 * Mark the attributes as stale, so that at th 134 * Mark the attributes as stale, so that at the next call to
125 * ->getattr() they will be fetched from users 135 * ->getattr() they will be fetched from userspace
126 */ 136 */
127 void fuse_invalidate_attr(struct inode *inode) 137 void fuse_invalidate_attr(struct inode *inode)
128 { 138 {
129 fuse_invalidate_attr_mask(inode, STATX 139 fuse_invalidate_attr_mask(inode, STATX_BASIC_STATS);
130 } 140 }
131 141
132 static void fuse_dir_changed(struct inode *dir 142 static void fuse_dir_changed(struct inode *dir)
133 { 143 {
134 fuse_invalidate_attr(dir); 144 fuse_invalidate_attr(dir);
135 inode_maybe_inc_iversion(dir, false); 145 inode_maybe_inc_iversion(dir, false);
136 } 146 }
137 147
138 /* 148 /*
139 * Mark the attributes as stale due to an atim 149 * Mark the attributes as stale due to an atime change. Avoid the invalidate if
140 * atime is not used. 150 * atime is not used.
141 */ 151 */
142 void fuse_invalidate_atime(struct inode *inode 152 void fuse_invalidate_atime(struct inode *inode)
143 { 153 {
144 if (!IS_RDONLY(inode)) 154 if (!IS_RDONLY(inode))
145 fuse_invalidate_attr_mask(inod 155 fuse_invalidate_attr_mask(inode, STATX_ATIME);
146 } 156 }
147 157
148 /* 158 /*
149 * Just mark the entry as stale, so that a nex 159 * Just mark the entry as stale, so that a next attempt to look it up
150 * will result in a new lookup call to userspa 160 * will result in a new lookup call to userspace
151 * 161 *
152 * This is called when a dentry is about to be 162 * This is called when a dentry is about to become negative and the
153 * timeout is unknown (unlink, rmdir, rename a 163 * timeout is unknown (unlink, rmdir, rename and in some cases
154 * lookup) 164 * lookup)
155 */ 165 */
156 void fuse_invalidate_entry_cache(struct dentry 166 void fuse_invalidate_entry_cache(struct dentry *entry)
157 { 167 {
158 fuse_dentry_settime(entry, 0); 168 fuse_dentry_settime(entry, 0);
159 } 169 }
160 170
161 /* 171 /*
162 * Same as fuse_invalidate_entry_cache(), but 172 * Same as fuse_invalidate_entry_cache(), but also try to remove the
163 * dentry from the hash 173 * dentry from the hash
164 */ 174 */
165 static void fuse_invalidate_entry(struct dentr 175 static void fuse_invalidate_entry(struct dentry *entry)
166 { 176 {
167 d_invalidate(entry); 177 d_invalidate(entry);
168 fuse_invalidate_entry_cache(entry); 178 fuse_invalidate_entry_cache(entry);
169 } 179 }
170 180
171 static void fuse_lookup_init(struct fuse_conn 181 static void fuse_lookup_init(struct fuse_conn *fc, struct fuse_args *args,
172 u64 nodeid, const 182 u64 nodeid, const struct qstr *name,
173 struct fuse_entry 183 struct fuse_entry_out *outarg)
174 { 184 {
175 memset(outarg, 0, sizeof(struct fuse_e 185 memset(outarg, 0, sizeof(struct fuse_entry_out));
176 args->opcode = FUSE_LOOKUP; 186 args->opcode = FUSE_LOOKUP;
177 args->nodeid = nodeid; 187 args->nodeid = nodeid;
178 args->in_numargs = 1; 188 args->in_numargs = 1;
179 args->in_args[0].size = name->len + 1; 189 args->in_args[0].size = name->len + 1;
180 args->in_args[0].value = name->name; 190 args->in_args[0].value = name->name;
181 args->out_numargs = 1; 191 args->out_numargs = 1;
182 args->out_args[0].size = sizeof(struct 192 args->out_args[0].size = sizeof(struct fuse_entry_out);
183 args->out_args[0].value = outarg; 193 args->out_args[0].value = outarg;
184 } 194 }
185 195
186 /* 196 /*
187 * Check whether the dentry is still valid 197 * Check whether the dentry is still valid
188 * 198 *
189 * If the entry validity timeout has expired a 199 * If the entry validity timeout has expired and the dentry is
190 * positive, try to redo the lookup. If the l 200 * positive, try to redo the lookup. If the lookup results in a
191 * different inode, then let the VFS invalidat 201 * different inode, then let the VFS invalidate the dentry and redo
192 * the lookup once more. If the lookup result 202 * the lookup once more. If the lookup results in the same inode,
193 * then refresh the attributes, timeouts and m 203 * then refresh the attributes, timeouts and mark the dentry valid.
194 */ 204 */
195 static int fuse_dentry_revalidate(struct dentr 205 static int fuse_dentry_revalidate(struct dentry *entry, unsigned int flags)
196 { 206 {
197 struct inode *inode; 207 struct inode *inode;
198 struct dentry *parent; 208 struct dentry *parent;
199 struct fuse_mount *fm; 209 struct fuse_mount *fm;
200 struct fuse_inode *fi; 210 struct fuse_inode *fi;
201 int ret; 211 int ret;
202 212
203 inode = d_inode_rcu(entry); 213 inode = d_inode_rcu(entry);
204 if (inode && fuse_is_bad(inode)) 214 if (inode && fuse_is_bad(inode))
205 goto invalid; 215 goto invalid;
206 else if (time_before64(fuse_dentry_tim 216 else if (time_before64(fuse_dentry_time(entry), get_jiffies_64()) ||
207 (flags & (LOOKUP_EXCL | LOOKU 217 (flags & (LOOKUP_EXCL | LOOKUP_REVAL | LOOKUP_RENAME_TARGET))) {
208 struct fuse_entry_out outarg; 218 struct fuse_entry_out outarg;
209 FUSE_ARGS(args); 219 FUSE_ARGS(args);
210 struct fuse_forget_link *forge 220 struct fuse_forget_link *forget;
211 u64 attr_version; 221 u64 attr_version;
212 222
213 /* For negative dentries, alwa 223 /* For negative dentries, always do a fresh lookup */
214 if (!inode) 224 if (!inode)
215 goto invalid; 225 goto invalid;
216 226
217 ret = -ECHILD; 227 ret = -ECHILD;
218 if (flags & LOOKUP_RCU) 228 if (flags & LOOKUP_RCU)
219 goto out; 229 goto out;
220 230
221 fm = get_fuse_mount(inode); 231 fm = get_fuse_mount(inode);
222 232
223 forget = fuse_alloc_forget(); 233 forget = fuse_alloc_forget();
224 ret = -ENOMEM; 234 ret = -ENOMEM;
225 if (!forget) 235 if (!forget)
226 goto out; 236 goto out;
227 237
228 attr_version = fuse_get_attr_v 238 attr_version = fuse_get_attr_version(fm->fc);
229 239
230 parent = dget_parent(entry); 240 parent = dget_parent(entry);
231 fuse_lookup_init(fm->fc, &args 241 fuse_lookup_init(fm->fc, &args, get_node_id(d_inode(parent)),
232 &entry->d_nam 242 &entry->d_name, &outarg);
233 ret = fuse_simple_request(fm, 243 ret = fuse_simple_request(fm, &args);
234 dput(parent); 244 dput(parent);
235 /* Zero nodeid is same as -ENO 245 /* Zero nodeid is same as -ENOENT */
236 if (!ret && !outarg.nodeid) 246 if (!ret && !outarg.nodeid)
237 ret = -ENOENT; 247 ret = -ENOENT;
238 if (!ret) { 248 if (!ret) {
239 fi = get_fuse_inode(in 249 fi = get_fuse_inode(inode);
240 if (outarg.nodeid != g 250 if (outarg.nodeid != get_node_id(inode) ||
241 (bool) IS_AUTOMOUN 251 (bool) IS_AUTOMOUNT(inode) != (bool) (outarg.attr.flags & FUSE_ATTR_SUBMOUNT)) {
242 fuse_queue_for 252 fuse_queue_forget(fm->fc, forget,
243 253 outarg.nodeid, 1);
244 goto invalid; 254 goto invalid;
245 } 255 }
246 spin_lock(&fi->lock); 256 spin_lock(&fi->lock);
247 fi->nlookup++; 257 fi->nlookup++;
248 spin_unlock(&fi->lock) 258 spin_unlock(&fi->lock);
249 } 259 }
250 kfree(forget); 260 kfree(forget);
251 if (ret == -ENOMEM || ret == - 261 if (ret == -ENOMEM || ret == -EINTR)
252 goto out; 262 goto out;
253 if (ret || fuse_invalid_attr(& 263 if (ret || fuse_invalid_attr(&outarg.attr) ||
254 fuse_stale_inode(inode, ou 264 fuse_stale_inode(inode, outarg.generation, &outarg.attr))
255 goto invalid; 265 goto invalid;
256 266
257 forget_all_cached_acls(inode); 267 forget_all_cached_acls(inode);
258 fuse_change_attributes(inode, !! 268 fuse_change_attributes(inode, &outarg.attr,
259 ATTR_TI !! 269 entry_attr_timeout(&outarg),
260 attr_ve 270 attr_version);
261 fuse_change_entry_timeout(entr 271 fuse_change_entry_timeout(entry, &outarg);
262 } else if (inode) { 272 } else if (inode) {
263 fi = get_fuse_inode(inode); 273 fi = get_fuse_inode(inode);
264 if (flags & LOOKUP_RCU) { 274 if (flags & LOOKUP_RCU) {
265 if (test_bit(FUSE_I_IN 275 if (test_bit(FUSE_I_INIT_RDPLUS, &fi->state))
266 return -ECHILD 276 return -ECHILD;
267 } else if (test_and_clear_bit( 277 } else if (test_and_clear_bit(FUSE_I_INIT_RDPLUS, &fi->state)) {
268 parent = dget_parent(e 278 parent = dget_parent(entry);
269 fuse_advise_use_readdi 279 fuse_advise_use_readdirplus(d_inode(parent));
270 dput(parent); 280 dput(parent);
271 } 281 }
272 } 282 }
273 ret = 1; 283 ret = 1;
274 out: 284 out:
275 return ret; 285 return ret;
276 286
277 invalid: 287 invalid:
278 ret = 0; 288 ret = 0;
279 goto out; 289 goto out;
280 } 290 }
281 291
282 #if BITS_PER_LONG < 64 292 #if BITS_PER_LONG < 64
283 static int fuse_dentry_init(struct dentry *den 293 static int fuse_dentry_init(struct dentry *dentry)
284 { 294 {
285 dentry->d_fsdata = kzalloc(sizeof(unio 295 dentry->d_fsdata = kzalloc(sizeof(union fuse_dentry),
286 GFP_KERNEL_ 296 GFP_KERNEL_ACCOUNT | __GFP_RECLAIMABLE);
287 297
288 return dentry->d_fsdata ? 0 : -ENOMEM; 298 return dentry->d_fsdata ? 0 : -ENOMEM;
289 } 299 }
290 static void fuse_dentry_release(struct dentry 300 static void fuse_dentry_release(struct dentry *dentry)
291 { 301 {
292 union fuse_dentry *fd = dentry->d_fsda 302 union fuse_dentry *fd = dentry->d_fsdata;
293 303
294 kfree_rcu(fd, rcu); 304 kfree_rcu(fd, rcu);
295 } 305 }
296 #endif 306 #endif
297 307
298 static int fuse_dentry_delete(const struct den 308 static int fuse_dentry_delete(const struct dentry *dentry)
299 { 309 {
300 return time_before64(fuse_dentry_time( 310 return time_before64(fuse_dentry_time(dentry), get_jiffies_64());
301 } 311 }
302 312
303 /* 313 /*
304 * Create a fuse_mount object with a new super 314 * Create a fuse_mount object with a new superblock (with path->dentry
305 * as the root), and return that mount so it c 315 * as the root), and return that mount so it can be auto-mounted on
306 * @path. 316 * @path.
307 */ 317 */
308 static struct vfsmount *fuse_dentry_automount( 318 static struct vfsmount *fuse_dentry_automount(struct path *path)
309 { 319 {
310 struct fs_context *fsc; 320 struct fs_context *fsc;
311 struct vfsmount *mnt; 321 struct vfsmount *mnt;
312 struct fuse_inode *mp_fi = get_fuse_in 322 struct fuse_inode *mp_fi = get_fuse_inode(d_inode(path->dentry));
313 323
314 fsc = fs_context_for_submount(path->mn 324 fsc = fs_context_for_submount(path->mnt->mnt_sb->s_type, path->dentry);
315 if (IS_ERR(fsc)) 325 if (IS_ERR(fsc))
316 return ERR_CAST(fsc); 326 return ERR_CAST(fsc);
317 327
318 /* Pass the FUSE inode of the mount fo 328 /* Pass the FUSE inode of the mount for fuse_get_tree_submount() */
319 fsc->fs_private = mp_fi; 329 fsc->fs_private = mp_fi;
320 330
321 /* Create the submount */ 331 /* Create the submount */
322 mnt = fc_mount(fsc); 332 mnt = fc_mount(fsc);
323 if (!IS_ERR(mnt)) 333 if (!IS_ERR(mnt))
324 mntget(mnt); 334 mntget(mnt);
325 335
326 put_fs_context(fsc); 336 put_fs_context(fsc);
327 return mnt; 337 return mnt;
328 } 338 }
329 339
330 const struct dentry_operations fuse_dentry_ope 340 const struct dentry_operations fuse_dentry_operations = {
331 .d_revalidate = fuse_dentry_revalida 341 .d_revalidate = fuse_dentry_revalidate,
332 .d_delete = fuse_dentry_delete, 342 .d_delete = fuse_dentry_delete,
333 #if BITS_PER_LONG < 64 343 #if BITS_PER_LONG < 64
334 .d_init = fuse_dentry_init, 344 .d_init = fuse_dentry_init,
335 .d_release = fuse_dentry_release, 345 .d_release = fuse_dentry_release,
336 #endif 346 #endif
337 .d_automount = fuse_dentry_automoun 347 .d_automount = fuse_dentry_automount,
338 }; 348 };
339 349
340 const struct dentry_operations fuse_root_dentr 350 const struct dentry_operations fuse_root_dentry_operations = {
341 #if BITS_PER_LONG < 64 351 #if BITS_PER_LONG < 64
342 .d_init = fuse_dentry_init, 352 .d_init = fuse_dentry_init,
343 .d_release = fuse_dentry_release, 353 .d_release = fuse_dentry_release,
344 #endif 354 #endif
345 }; 355 };
346 356
347 int fuse_valid_type(int m) 357 int fuse_valid_type(int m)
348 { 358 {
349 return S_ISREG(m) || S_ISDIR(m) || S_I 359 return S_ISREG(m) || S_ISDIR(m) || S_ISLNK(m) || S_ISCHR(m) ||
350 S_ISBLK(m) || S_ISFIFO(m) || S 360 S_ISBLK(m) || S_ISFIFO(m) || S_ISSOCK(m);
351 } 361 }
352 362
353 static bool fuse_valid_size(u64 size) <<
354 { <<
355 return size <= LLONG_MAX; <<
356 } <<
357 <<
358 bool fuse_invalid_attr(struct fuse_attr *attr) 363 bool fuse_invalid_attr(struct fuse_attr *attr)
359 { 364 {
360 return !fuse_valid_type(attr->mode) || !! 365 return !fuse_valid_type(attr->mode) ||
>> 366 attr->size > LLONG_MAX;
361 } 367 }
362 368
363 int fuse_lookup_name(struct super_block *sb, u 369 int fuse_lookup_name(struct super_block *sb, u64 nodeid, const struct qstr *name,
364 struct fuse_entry_out *ou 370 struct fuse_entry_out *outarg, struct inode **inode)
365 { 371 {
366 struct fuse_mount *fm = get_fuse_mount 372 struct fuse_mount *fm = get_fuse_mount_super(sb);
367 FUSE_ARGS(args); 373 FUSE_ARGS(args);
368 struct fuse_forget_link *forget; 374 struct fuse_forget_link *forget;
369 u64 attr_version; 375 u64 attr_version;
370 int err; 376 int err;
371 377
372 *inode = NULL; 378 *inode = NULL;
373 err = -ENAMETOOLONG; 379 err = -ENAMETOOLONG;
374 if (name->len > FUSE_NAME_MAX) 380 if (name->len > FUSE_NAME_MAX)
375 goto out; 381 goto out;
376 382
377 383
378 forget = fuse_alloc_forget(); 384 forget = fuse_alloc_forget();
379 err = -ENOMEM; 385 err = -ENOMEM;
380 if (!forget) 386 if (!forget)
381 goto out; 387 goto out;
382 388
383 attr_version = fuse_get_attr_version(f 389 attr_version = fuse_get_attr_version(fm->fc);
384 390
385 fuse_lookup_init(fm->fc, &args, nodeid 391 fuse_lookup_init(fm->fc, &args, nodeid, name, outarg);
386 err = fuse_simple_request(fm, &args); 392 err = fuse_simple_request(fm, &args);
387 /* Zero nodeid is same as -ENOENT, but 393 /* Zero nodeid is same as -ENOENT, but with valid timeout */
388 if (err || !outarg->nodeid) 394 if (err || !outarg->nodeid)
389 goto out_put_forget; 395 goto out_put_forget;
390 396
391 err = -EIO; 397 err = -EIO;
>> 398 if (!outarg->nodeid)
>> 399 goto out_put_forget;
392 if (fuse_invalid_attr(&outarg->attr)) 400 if (fuse_invalid_attr(&outarg->attr))
393 goto out_put_forget; 401 goto out_put_forget;
394 if (outarg->nodeid == FUSE_ROOT_ID && <<
395 pr_warn_once("root generation <<
396 outarg->generation = 0; <<
397 } <<
398 402
399 *inode = fuse_iget(sb, outarg->nodeid, 403 *inode = fuse_iget(sb, outarg->nodeid, outarg->generation,
400 &outarg->attr, ATTR !! 404 &outarg->attr, entry_attr_timeout(outarg),
401 attr_version); 405 attr_version);
402 err = -ENOMEM; 406 err = -ENOMEM;
403 if (!*inode) { 407 if (!*inode) {
404 fuse_queue_forget(fm->fc, forg 408 fuse_queue_forget(fm->fc, forget, outarg->nodeid, 1);
405 goto out; 409 goto out;
406 } 410 }
407 err = 0; 411 err = 0;
408 412
409 out_put_forget: 413 out_put_forget:
410 kfree(forget); 414 kfree(forget);
411 out: 415 out:
412 return err; 416 return err;
413 } 417 }
414 418
415 static struct dentry *fuse_lookup(struct inode 419 static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
416 unsigned int 420 unsigned int flags)
417 { 421 {
418 int err; 422 int err;
419 struct fuse_entry_out outarg; 423 struct fuse_entry_out outarg;
420 struct inode *inode; 424 struct inode *inode;
421 struct dentry *newent; 425 struct dentry *newent;
422 bool outarg_valid = true; 426 bool outarg_valid = true;
423 bool locked; 427 bool locked;
424 428
425 if (fuse_is_bad(dir)) 429 if (fuse_is_bad(dir))
426 return ERR_PTR(-EIO); 430 return ERR_PTR(-EIO);
427 431
428 locked = fuse_lock_inode(dir); 432 locked = fuse_lock_inode(dir);
429 err = fuse_lookup_name(dir->i_sb, get_ 433 err = fuse_lookup_name(dir->i_sb, get_node_id(dir), &entry->d_name,
430 &outarg, &inode 434 &outarg, &inode);
431 fuse_unlock_inode(dir, locked); 435 fuse_unlock_inode(dir, locked);
432 if (err == -ENOENT) { 436 if (err == -ENOENT) {
433 outarg_valid = false; 437 outarg_valid = false;
434 err = 0; 438 err = 0;
435 } 439 }
436 if (err) 440 if (err)
437 goto out_err; 441 goto out_err;
438 442
439 err = -EIO; 443 err = -EIO;
440 if (inode && get_node_id(inode) == FUS 444 if (inode && get_node_id(inode) == FUSE_ROOT_ID)
441 goto out_iput; 445 goto out_iput;
442 446
443 newent = d_splice_alias(inode, entry); 447 newent = d_splice_alias(inode, entry);
444 err = PTR_ERR(newent); 448 err = PTR_ERR(newent);
445 if (IS_ERR(newent)) 449 if (IS_ERR(newent))
446 goto out_err; 450 goto out_err;
447 451
448 entry = newent ? newent : entry; 452 entry = newent ? newent : entry;
449 if (outarg_valid) 453 if (outarg_valid)
450 fuse_change_entry_timeout(entr 454 fuse_change_entry_timeout(entry, &outarg);
451 else 455 else
452 fuse_invalidate_entry_cache(en 456 fuse_invalidate_entry_cache(entry);
453 457
454 if (inode) 458 if (inode)
455 fuse_advise_use_readdirplus(di 459 fuse_advise_use_readdirplus(dir);
456 return newent; 460 return newent;
457 461
458 out_iput: 462 out_iput:
459 iput(inode); 463 iput(inode);
460 out_err: 464 out_err:
461 return ERR_PTR(err); 465 return ERR_PTR(err);
462 } 466 }
463 467
464 static int get_security_context(struct dentry 468 static int get_security_context(struct dentry *entry, umode_t mode,
465 struct fuse_in 469 struct fuse_in_arg *ext)
466 { 470 {
467 struct fuse_secctx *fctx; 471 struct fuse_secctx *fctx;
468 struct fuse_secctx_header *header; 472 struct fuse_secctx_header *header;
469 void *ctx = NULL, *ptr; 473 void *ctx = NULL, *ptr;
470 u32 ctxlen, total_len = sizeof(*header 474 u32 ctxlen, total_len = sizeof(*header);
471 int err, nr_ctx = 0; 475 int err, nr_ctx = 0;
472 const char *name; 476 const char *name;
473 size_t namelen; 477 size_t namelen;
474 478
475 err = security_dentry_init_security(en 479 err = security_dentry_init_security(entry, mode, &entry->d_name,
476 &n 480 &name, &ctx, &ctxlen);
477 if (err) { 481 if (err) {
478 if (err != -EOPNOTSUPP) 482 if (err != -EOPNOTSUPP)
479 goto out_err; 483 goto out_err;
480 /* No LSM is supporting this s 484 /* No LSM is supporting this security hook. Ignore error */
481 ctxlen = 0; 485 ctxlen = 0;
482 ctx = NULL; 486 ctx = NULL;
483 } 487 }
484 488
485 if (ctxlen) { 489 if (ctxlen) {
486 nr_ctx = 1; 490 nr_ctx = 1;
487 namelen = strlen(name) + 1; 491 namelen = strlen(name) + 1;
488 err = -EIO; 492 err = -EIO;
489 if (WARN_ON(namelen > XATTR_NA 493 if (WARN_ON(namelen > XATTR_NAME_MAX + 1 || ctxlen > S32_MAX))
490 goto out_err; 494 goto out_err;
491 total_len += FUSE_REC_ALIGN(si 495 total_len += FUSE_REC_ALIGN(sizeof(*fctx) + namelen + ctxlen);
492 } 496 }
493 497
494 err = -ENOMEM; 498 err = -ENOMEM;
495 header = ptr = kzalloc(total_len, GFP_ 499 header = ptr = kzalloc(total_len, GFP_KERNEL);
496 if (!ptr) 500 if (!ptr)
497 goto out_err; 501 goto out_err;
498 502
499 header->nr_secctx = nr_ctx; 503 header->nr_secctx = nr_ctx;
500 header->size = total_len; 504 header->size = total_len;
501 ptr += sizeof(*header); 505 ptr += sizeof(*header);
502 if (nr_ctx) { 506 if (nr_ctx) {
503 fctx = ptr; 507 fctx = ptr;
504 fctx->size = ctxlen; 508 fctx->size = ctxlen;
505 ptr += sizeof(*fctx); 509 ptr += sizeof(*fctx);
506 510
507 strcpy(ptr, name); 511 strcpy(ptr, name);
508 ptr += namelen; 512 ptr += namelen;
509 513
510 memcpy(ptr, ctx, ctxlen); 514 memcpy(ptr, ctx, ctxlen);
511 } 515 }
512 ext->size = total_len; 516 ext->size = total_len;
513 ext->value = header; 517 ext->value = header;
514 err = 0; 518 err = 0;
515 out_err: 519 out_err:
516 kfree(ctx); 520 kfree(ctx);
517 return err; 521 return err;
518 } 522 }
519 523
520 static void *extend_arg(struct fuse_in_arg *bu 524 static void *extend_arg(struct fuse_in_arg *buf, u32 bytes)
521 { 525 {
522 void *p; 526 void *p;
523 u32 newlen = buf->size + bytes; 527 u32 newlen = buf->size + bytes;
524 528
525 p = krealloc(buf->value, newlen, GFP_K 529 p = krealloc(buf->value, newlen, GFP_KERNEL);
526 if (!p) { 530 if (!p) {
527 kfree(buf->value); 531 kfree(buf->value);
528 buf->size = 0; 532 buf->size = 0;
529 buf->value = NULL; 533 buf->value = NULL;
530 return NULL; 534 return NULL;
531 } 535 }
532 536
533 memset(p + buf->size, 0, bytes); 537 memset(p + buf->size, 0, bytes);
534 buf->value = p; 538 buf->value = p;
535 buf->size = newlen; 539 buf->size = newlen;
536 540
537 return p + newlen - bytes; 541 return p + newlen - bytes;
538 } 542 }
539 543
540 static u32 fuse_ext_size(size_t size) 544 static u32 fuse_ext_size(size_t size)
541 { 545 {
542 return FUSE_REC_ALIGN(sizeof(struct fu 546 return FUSE_REC_ALIGN(sizeof(struct fuse_ext_header) + size);
543 } 547 }
544 548
545 /* 549 /*
546 * This adds just a single supplementary group 550 * This adds just a single supplementary group that matches the parent's group.
547 */ 551 */
548 static int get_create_supp_group(struct inode 552 static int get_create_supp_group(struct inode *dir, struct fuse_in_arg *ext)
549 { 553 {
550 struct fuse_conn *fc = get_fuse_conn(d 554 struct fuse_conn *fc = get_fuse_conn(dir);
551 struct fuse_ext_header *xh; 555 struct fuse_ext_header *xh;
552 struct fuse_supp_groups *sg; 556 struct fuse_supp_groups *sg;
553 kgid_t kgid = dir->i_gid; 557 kgid_t kgid = dir->i_gid;
554 gid_t parent_gid = from_kgid(fc->user_ 558 gid_t parent_gid = from_kgid(fc->user_ns, kgid);
555 u32 sg_len = fuse_ext_size(sizeof(*sg) 559 u32 sg_len = fuse_ext_size(sizeof(*sg) + sizeof(sg->groups[0]));
556 560
557 if (parent_gid == (gid_t) -1 || gid_eq 561 if (parent_gid == (gid_t) -1 || gid_eq(kgid, current_fsgid()) ||
558 !in_group_p(kgid)) 562 !in_group_p(kgid))
559 return 0; 563 return 0;
560 564
561 xh = extend_arg(ext, sg_len); 565 xh = extend_arg(ext, sg_len);
562 if (!xh) 566 if (!xh)
563 return -ENOMEM; 567 return -ENOMEM;
564 568
565 xh->size = sg_len; 569 xh->size = sg_len;
566 xh->type = FUSE_EXT_GROUPS; 570 xh->type = FUSE_EXT_GROUPS;
567 571
568 sg = (struct fuse_supp_groups *) &xh[1 572 sg = (struct fuse_supp_groups *) &xh[1];
569 sg->nr_groups = 1; 573 sg->nr_groups = 1;
570 sg->groups[0] = parent_gid; 574 sg->groups[0] = parent_gid;
571 575
572 return 0; 576 return 0;
573 } 577 }
574 578
575 static int get_create_ext(struct fuse_args *ar 579 static int get_create_ext(struct fuse_args *args,
576 struct inode *dir, s 580 struct inode *dir, struct dentry *dentry,
577 umode_t mode) 581 umode_t mode)
578 { 582 {
579 struct fuse_conn *fc = get_fuse_conn_s 583 struct fuse_conn *fc = get_fuse_conn_super(dentry->d_sb);
580 struct fuse_in_arg ext = { .size = 0, 584 struct fuse_in_arg ext = { .size = 0, .value = NULL };
581 int err = 0; 585 int err = 0;
582 586
583 if (fc->init_security) 587 if (fc->init_security)
584 err = get_security_context(den 588 err = get_security_context(dentry, mode, &ext);
585 if (!err && fc->create_supp_group) 589 if (!err && fc->create_supp_group)
586 err = get_create_supp_group(di 590 err = get_create_supp_group(dir, &ext);
587 591
588 if (!err && ext.size) { 592 if (!err && ext.size) {
589 WARN_ON(args->in_numargs >= AR 593 WARN_ON(args->in_numargs >= ARRAY_SIZE(args->in_args));
590 args->is_ext = true; 594 args->is_ext = true;
591 args->ext_idx = args->in_numar 595 args->ext_idx = args->in_numargs++;
592 args->in_args[args->ext_idx] = 596 args->in_args[args->ext_idx] = ext;
593 } else { 597 } else {
594 kfree(ext.value); 598 kfree(ext.value);
595 } 599 }
596 600
597 return err; 601 return err;
598 } 602 }
599 603
600 static void free_ext_value(struct fuse_args *a 604 static void free_ext_value(struct fuse_args *args)
601 { 605 {
602 if (args->is_ext) 606 if (args->is_ext)
603 kfree(args->in_args[args->ext_ 607 kfree(args->in_args[args->ext_idx].value);
604 } 608 }
605 609
606 /* 610 /*
607 * Atomic create+open operation 611 * Atomic create+open operation
608 * 612 *
609 * If the filesystem doesn't support this, the 613 * If the filesystem doesn't support this, then fall back to separate
610 * 'mknod' + 'open' requests. 614 * 'mknod' + 'open' requests.
611 */ 615 */
612 static int fuse_create_open(struct inode *dir, 616 static int fuse_create_open(struct inode *dir, struct dentry *entry,
613 struct file *file, 617 struct file *file, unsigned int flags,
614 umode_t mode, u32 618 umode_t mode, u32 opcode)
615 { 619 {
616 int err; 620 int err;
617 struct inode *inode; 621 struct inode *inode;
618 struct fuse_mount *fm = get_fuse_mount 622 struct fuse_mount *fm = get_fuse_mount(dir);
619 FUSE_ARGS(args); 623 FUSE_ARGS(args);
620 struct fuse_forget_link *forget; 624 struct fuse_forget_link *forget;
621 struct fuse_create_in inarg; 625 struct fuse_create_in inarg;
622 struct fuse_open_out *outopenp; !! 626 struct fuse_open_out outopen;
623 struct fuse_entry_out outentry; 627 struct fuse_entry_out outentry;
624 struct fuse_inode *fi; 628 struct fuse_inode *fi;
625 struct fuse_file *ff; 629 struct fuse_file *ff;
626 bool trunc = flags & O_TRUNC; 630 bool trunc = flags & O_TRUNC;
627 631
628 /* Userspace expects S_IFREG in create 632 /* Userspace expects S_IFREG in create mode */
629 BUG_ON((mode & S_IFMT) != S_IFREG); 633 BUG_ON((mode & S_IFMT) != S_IFREG);
630 634
631 forget = fuse_alloc_forget(); 635 forget = fuse_alloc_forget();
632 err = -ENOMEM; 636 err = -ENOMEM;
633 if (!forget) 637 if (!forget)
634 goto out_err; 638 goto out_err;
635 639
636 err = -ENOMEM; 640 err = -ENOMEM;
637 ff = fuse_file_alloc(fm, true); !! 641 ff = fuse_file_alloc(fm);
638 if (!ff) 642 if (!ff)
639 goto out_put_forget_req; 643 goto out_put_forget_req;
640 644
641 if (!fm->fc->dont_mask) 645 if (!fm->fc->dont_mask)
642 mode &= ~current_umask(); 646 mode &= ~current_umask();
643 647
644 flags &= ~O_NOCTTY; 648 flags &= ~O_NOCTTY;
645 memset(&inarg, 0, sizeof(inarg)); 649 memset(&inarg, 0, sizeof(inarg));
646 memset(&outentry, 0, sizeof(outentry)) 650 memset(&outentry, 0, sizeof(outentry));
647 inarg.flags = flags; 651 inarg.flags = flags;
648 inarg.mode = mode; 652 inarg.mode = mode;
649 inarg.umask = current_umask(); 653 inarg.umask = current_umask();
650 654
651 if (fm->fc->handle_killpriv_v2 && trun 655 if (fm->fc->handle_killpriv_v2 && trunc &&
652 !(flags & O_EXCL) && !capable(CAP_ 656 !(flags & O_EXCL) && !capable(CAP_FSETID)) {
653 inarg.open_flags |= FUSE_OPEN_ 657 inarg.open_flags |= FUSE_OPEN_KILL_SUIDGID;
654 } 658 }
655 659
656 args.opcode = opcode; 660 args.opcode = opcode;
657 args.nodeid = get_node_id(dir); 661 args.nodeid = get_node_id(dir);
658 args.in_numargs = 2; 662 args.in_numargs = 2;
659 args.in_args[0].size = sizeof(inarg); 663 args.in_args[0].size = sizeof(inarg);
660 args.in_args[0].value = &inarg; 664 args.in_args[0].value = &inarg;
661 args.in_args[1].size = entry->d_name.l 665 args.in_args[1].size = entry->d_name.len + 1;
662 args.in_args[1].value = entry->d_name. 666 args.in_args[1].value = entry->d_name.name;
663 args.out_numargs = 2; 667 args.out_numargs = 2;
664 args.out_args[0].size = sizeof(outentr 668 args.out_args[0].size = sizeof(outentry);
665 args.out_args[0].value = &outentry; 669 args.out_args[0].value = &outentry;
666 /* Store outarg for fuse_finish_open() !! 670 args.out_args[1].size = sizeof(outopen);
667 outopenp = &ff->args->open_outarg; !! 671 args.out_args[1].value = &outopen;
668 args.out_args[1].size = sizeof(*outope <<
669 args.out_args[1].value = outopenp; <<
670 672
671 err = get_create_ext(&args, dir, entry 673 err = get_create_ext(&args, dir, entry, mode);
672 if (err) 674 if (err)
673 goto out_free_ff; !! 675 goto out_put_forget_req;
674 676
675 err = fuse_simple_request(fm, &args); 677 err = fuse_simple_request(fm, &args);
676 free_ext_value(&args); 678 free_ext_value(&args);
677 if (err) 679 if (err)
678 goto out_free_ff; 680 goto out_free_ff;
679 681
680 err = -EIO; 682 err = -EIO;
681 if (!S_ISREG(outentry.attr.mode) || in 683 if (!S_ISREG(outentry.attr.mode) || invalid_nodeid(outentry.nodeid) ||
682 fuse_invalid_attr(&outentry.attr)) 684 fuse_invalid_attr(&outentry.attr))
683 goto out_free_ff; 685 goto out_free_ff;
684 686
685 ff->fh = outopenp->fh; !! 687 ff->fh = outopen.fh;
686 ff->nodeid = outentry.nodeid; 688 ff->nodeid = outentry.nodeid;
687 ff->open_flags = outopenp->open_flags; !! 689 ff->open_flags = outopen.open_flags;
688 inode = fuse_iget(dir->i_sb, outentry. 690 inode = fuse_iget(dir->i_sb, outentry.nodeid, outentry.generation,
689 &outentry.attr, ATTR !! 691 &outentry.attr, entry_attr_timeout(&outentry), 0);
690 if (!inode) { 692 if (!inode) {
691 flags &= ~(O_CREAT | O_EXCL | 693 flags &= ~(O_CREAT | O_EXCL | O_TRUNC);
692 fuse_sync_release(NULL, ff, fl 694 fuse_sync_release(NULL, ff, flags);
693 fuse_queue_forget(fm->fc, forg 695 fuse_queue_forget(fm->fc, forget, outentry.nodeid, 1);
694 err = -ENOMEM; 696 err = -ENOMEM;
695 goto out_err; 697 goto out_err;
696 } 698 }
697 kfree(forget); 699 kfree(forget);
698 d_instantiate(entry, inode); 700 d_instantiate(entry, inode);
699 fuse_change_entry_timeout(entry, &oute 701 fuse_change_entry_timeout(entry, &outentry);
700 fuse_dir_changed(dir); 702 fuse_dir_changed(dir);
701 err = generic_file_open(inode, file); !! 703 err = finish_open(file, entry, generic_file_open);
702 if (!err) { <<
703 file->private_data = ff; <<
704 err = finish_open(file, entry, <<
705 } <<
706 if (err) { 704 if (err) {
707 fi = get_fuse_inode(inode); 705 fi = get_fuse_inode(inode);
708 fuse_sync_release(fi, ff, flag 706 fuse_sync_release(fi, ff, flags);
709 } else { 707 } else {
>> 708 file->private_data = ff;
>> 709 fuse_finish_open(inode, file);
710 if (fm->fc->atomic_o_trunc && 710 if (fm->fc->atomic_o_trunc && trunc)
711 truncate_pagecache(ino 711 truncate_pagecache(inode, 0);
712 else if (!(ff->open_flags & FO 712 else if (!(ff->open_flags & FOPEN_KEEP_CACHE))
713 invalidate_inode_pages 713 invalidate_inode_pages2(inode->i_mapping);
714 } 714 }
715 return err; 715 return err;
716 716
717 out_free_ff: 717 out_free_ff:
718 fuse_file_free(ff); 718 fuse_file_free(ff);
719 out_put_forget_req: 719 out_put_forget_req:
720 kfree(forget); 720 kfree(forget);
721 out_err: 721 out_err:
722 return err; 722 return err;
723 } 723 }
724 724
725 static int fuse_mknod(struct mnt_idmap *, stru 725 static int fuse_mknod(struct mnt_idmap *, struct inode *, struct dentry *,
726 umode_t, dev_t); 726 umode_t, dev_t);
727 static int fuse_atomic_open(struct inode *dir, 727 static int fuse_atomic_open(struct inode *dir, struct dentry *entry,
728 struct file *file, 728 struct file *file, unsigned flags,
729 umode_t mode) 729 umode_t mode)
730 { 730 {
731 int err; 731 int err;
732 struct fuse_conn *fc = get_fuse_conn(d 732 struct fuse_conn *fc = get_fuse_conn(dir);
733 struct dentry *res = NULL; 733 struct dentry *res = NULL;
734 734
735 if (fuse_is_bad(dir)) 735 if (fuse_is_bad(dir))
736 return -EIO; 736 return -EIO;
737 737
738 if (d_in_lookup(entry)) { 738 if (d_in_lookup(entry)) {
739 res = fuse_lookup(dir, entry, 739 res = fuse_lookup(dir, entry, 0);
740 if (IS_ERR(res)) 740 if (IS_ERR(res))
741 return PTR_ERR(res); 741 return PTR_ERR(res);
742 742
743 if (res) 743 if (res)
744 entry = res; 744 entry = res;
745 } 745 }
746 746
747 if (!(flags & O_CREAT) || d_really_is_ 747 if (!(flags & O_CREAT) || d_really_is_positive(entry))
748 goto no_open; 748 goto no_open;
749 749
750 /* Only creates */ 750 /* Only creates */
751 file->f_mode |= FMODE_CREATED; 751 file->f_mode |= FMODE_CREATED;
752 752
753 if (fc->no_create) 753 if (fc->no_create)
754 goto mknod; 754 goto mknod;
755 755
756 err = fuse_create_open(dir, entry, fil 756 err = fuse_create_open(dir, entry, file, flags, mode, FUSE_CREATE);
757 if (err == -ENOSYS) { 757 if (err == -ENOSYS) {
758 fc->no_create = 1; 758 fc->no_create = 1;
759 goto mknod; 759 goto mknod;
760 } else if (err == -EEXIST) !! 760 }
761 fuse_invalidate_entry(entry); <<
762 out_dput: 761 out_dput:
763 dput(res); 762 dput(res);
764 return err; 763 return err;
765 764
766 mknod: 765 mknod:
767 err = fuse_mknod(&nop_mnt_idmap, dir, 766 err = fuse_mknod(&nop_mnt_idmap, dir, entry, mode, 0);
768 if (err) 767 if (err)
769 goto out_dput; 768 goto out_dput;
770 no_open: 769 no_open:
771 return finish_no_open(file, res); 770 return finish_no_open(file, res);
772 } 771 }
773 772
774 /* 773 /*
775 * Code shared between mknod, mkdir, symlink a 774 * Code shared between mknod, mkdir, symlink and link
776 */ 775 */
777 static int create_new_entry(struct fuse_mount 776 static int create_new_entry(struct fuse_mount *fm, struct fuse_args *args,
778 struct inode *dir, 777 struct inode *dir, struct dentry *entry,
779 umode_t mode) 778 umode_t mode)
780 { 779 {
781 struct fuse_entry_out outarg; 780 struct fuse_entry_out outarg;
782 struct inode *inode; 781 struct inode *inode;
783 struct dentry *d; 782 struct dentry *d;
784 int err; 783 int err;
785 struct fuse_forget_link *forget; 784 struct fuse_forget_link *forget;
786 785
787 if (fuse_is_bad(dir)) 786 if (fuse_is_bad(dir))
788 return -EIO; 787 return -EIO;
789 788
790 forget = fuse_alloc_forget(); 789 forget = fuse_alloc_forget();
791 if (!forget) 790 if (!forget)
792 return -ENOMEM; 791 return -ENOMEM;
793 792
794 memset(&outarg, 0, sizeof(outarg)); 793 memset(&outarg, 0, sizeof(outarg));
795 args->nodeid = get_node_id(dir); 794 args->nodeid = get_node_id(dir);
796 args->out_numargs = 1; 795 args->out_numargs = 1;
797 args->out_args[0].size = sizeof(outarg 796 args->out_args[0].size = sizeof(outarg);
798 args->out_args[0].value = &outarg; 797 args->out_args[0].value = &outarg;
799 798
800 if (args->opcode != FUSE_LINK) { 799 if (args->opcode != FUSE_LINK) {
801 err = get_create_ext(args, dir 800 err = get_create_ext(args, dir, entry, mode);
802 if (err) 801 if (err)
803 goto out_put_forget_re 802 goto out_put_forget_req;
804 } 803 }
805 804
806 err = fuse_simple_request(fm, args); 805 err = fuse_simple_request(fm, args);
807 free_ext_value(args); 806 free_ext_value(args);
808 if (err) 807 if (err)
809 goto out_put_forget_req; 808 goto out_put_forget_req;
810 809
811 err = -EIO; 810 err = -EIO;
812 if (invalid_nodeid(outarg.nodeid) || f 811 if (invalid_nodeid(outarg.nodeid) || fuse_invalid_attr(&outarg.attr))
813 goto out_put_forget_req; 812 goto out_put_forget_req;
814 813
815 if ((outarg.attr.mode ^ mode) & S_IFMT 814 if ((outarg.attr.mode ^ mode) & S_IFMT)
816 goto out_put_forget_req; 815 goto out_put_forget_req;
817 816
818 inode = fuse_iget(dir->i_sb, outarg.no 817 inode = fuse_iget(dir->i_sb, outarg.nodeid, outarg.generation,
819 &outarg.attr, ATTR_T !! 818 &outarg.attr, entry_attr_timeout(&outarg), 0);
820 if (!inode) { 819 if (!inode) {
821 fuse_queue_forget(fm->fc, forg 820 fuse_queue_forget(fm->fc, forget, outarg.nodeid, 1);
822 return -ENOMEM; 821 return -ENOMEM;
823 } 822 }
824 kfree(forget); 823 kfree(forget);
825 824
826 d_drop(entry); 825 d_drop(entry);
827 d = d_splice_alias(inode, entry); 826 d = d_splice_alias(inode, entry);
828 if (IS_ERR(d)) 827 if (IS_ERR(d))
829 return PTR_ERR(d); 828 return PTR_ERR(d);
830 829
831 if (d) { 830 if (d) {
832 fuse_change_entry_timeout(d, & 831 fuse_change_entry_timeout(d, &outarg);
833 dput(d); 832 dput(d);
834 } else { 833 } else {
835 fuse_change_entry_timeout(entr 834 fuse_change_entry_timeout(entry, &outarg);
836 } 835 }
837 fuse_dir_changed(dir); 836 fuse_dir_changed(dir);
838 return 0; 837 return 0;
839 838
840 out_put_forget_req: 839 out_put_forget_req:
841 if (err == -EEXIST) <<
842 fuse_invalidate_entry(entry); <<
843 kfree(forget); 840 kfree(forget);
844 return err; 841 return err;
845 } 842 }
846 843
847 static int fuse_mknod(struct mnt_idmap *idmap, 844 static int fuse_mknod(struct mnt_idmap *idmap, struct inode *dir,
848 struct dentry *entry, um 845 struct dentry *entry, umode_t mode, dev_t rdev)
849 { 846 {
850 struct fuse_mknod_in inarg; 847 struct fuse_mknod_in inarg;
851 struct fuse_mount *fm = get_fuse_mount 848 struct fuse_mount *fm = get_fuse_mount(dir);
852 FUSE_ARGS(args); 849 FUSE_ARGS(args);
853 850
854 if (!fm->fc->dont_mask) 851 if (!fm->fc->dont_mask)
855 mode &= ~current_umask(); 852 mode &= ~current_umask();
856 853
857 memset(&inarg, 0, sizeof(inarg)); 854 memset(&inarg, 0, sizeof(inarg));
858 inarg.mode = mode; 855 inarg.mode = mode;
859 inarg.rdev = new_encode_dev(rdev); 856 inarg.rdev = new_encode_dev(rdev);
860 inarg.umask = current_umask(); 857 inarg.umask = current_umask();
861 args.opcode = FUSE_MKNOD; 858 args.opcode = FUSE_MKNOD;
862 args.in_numargs = 2; 859 args.in_numargs = 2;
863 args.in_args[0].size = sizeof(inarg); 860 args.in_args[0].size = sizeof(inarg);
864 args.in_args[0].value = &inarg; 861 args.in_args[0].value = &inarg;
865 args.in_args[1].size = entry->d_name.l 862 args.in_args[1].size = entry->d_name.len + 1;
866 args.in_args[1].value = entry->d_name. 863 args.in_args[1].value = entry->d_name.name;
867 return create_new_entry(fm, &args, dir 864 return create_new_entry(fm, &args, dir, entry, mode);
868 } 865 }
869 866
870 static int fuse_create(struct mnt_idmap *idmap 867 static int fuse_create(struct mnt_idmap *idmap, struct inode *dir,
871 struct dentry *entry, u 868 struct dentry *entry, umode_t mode, bool excl)
872 { 869 {
873 return fuse_mknod(&nop_mnt_idmap, dir, 870 return fuse_mknod(&nop_mnt_idmap, dir, entry, mode, 0);
874 } 871 }
875 872
876 static int fuse_tmpfile(struct mnt_idmap *idma 873 static int fuse_tmpfile(struct mnt_idmap *idmap, struct inode *dir,
877 struct file *file, umo 874 struct file *file, umode_t mode)
878 { 875 {
879 struct fuse_conn *fc = get_fuse_conn(d 876 struct fuse_conn *fc = get_fuse_conn(dir);
880 int err; 877 int err;
881 878
882 if (fc->no_tmpfile) 879 if (fc->no_tmpfile)
883 return -EOPNOTSUPP; 880 return -EOPNOTSUPP;
884 881
885 err = fuse_create_open(dir, file->f_pa 882 err = fuse_create_open(dir, file->f_path.dentry, file, file->f_flags, mode, FUSE_TMPFILE);
886 if (err == -ENOSYS) { 883 if (err == -ENOSYS) {
887 fc->no_tmpfile = 1; 884 fc->no_tmpfile = 1;
888 err = -EOPNOTSUPP; 885 err = -EOPNOTSUPP;
889 } 886 }
890 return err; 887 return err;
891 } 888 }
892 889
893 static int fuse_mkdir(struct mnt_idmap *idmap, 890 static int fuse_mkdir(struct mnt_idmap *idmap, struct inode *dir,
894 struct dentry *entry, um 891 struct dentry *entry, umode_t mode)
895 { 892 {
896 struct fuse_mkdir_in inarg; 893 struct fuse_mkdir_in inarg;
897 struct fuse_mount *fm = get_fuse_mount 894 struct fuse_mount *fm = get_fuse_mount(dir);
898 FUSE_ARGS(args); 895 FUSE_ARGS(args);
899 896
900 if (!fm->fc->dont_mask) 897 if (!fm->fc->dont_mask)
901 mode &= ~current_umask(); 898 mode &= ~current_umask();
902 899
903 memset(&inarg, 0, sizeof(inarg)); 900 memset(&inarg, 0, sizeof(inarg));
904 inarg.mode = mode; 901 inarg.mode = mode;
905 inarg.umask = current_umask(); 902 inarg.umask = current_umask();
906 args.opcode = FUSE_MKDIR; 903 args.opcode = FUSE_MKDIR;
907 args.in_numargs = 2; 904 args.in_numargs = 2;
908 args.in_args[0].size = sizeof(inarg); 905 args.in_args[0].size = sizeof(inarg);
909 args.in_args[0].value = &inarg; 906 args.in_args[0].value = &inarg;
910 args.in_args[1].size = entry->d_name.l 907 args.in_args[1].size = entry->d_name.len + 1;
911 args.in_args[1].value = entry->d_name. 908 args.in_args[1].value = entry->d_name.name;
912 return create_new_entry(fm, &args, dir 909 return create_new_entry(fm, &args, dir, entry, S_IFDIR);
913 } 910 }
914 911
915 static int fuse_symlink(struct mnt_idmap *idma 912 static int fuse_symlink(struct mnt_idmap *idmap, struct inode *dir,
916 struct dentry *entry, 913 struct dentry *entry, const char *link)
917 { 914 {
918 struct fuse_mount *fm = get_fuse_mount 915 struct fuse_mount *fm = get_fuse_mount(dir);
919 unsigned len = strlen(link) + 1; 916 unsigned len = strlen(link) + 1;
920 FUSE_ARGS(args); 917 FUSE_ARGS(args);
921 918
922 args.opcode = FUSE_SYMLINK; 919 args.opcode = FUSE_SYMLINK;
923 args.in_numargs = 2; 920 args.in_numargs = 2;
924 args.in_args[0].size = entry->d_name.l 921 args.in_args[0].size = entry->d_name.len + 1;
925 args.in_args[0].value = entry->d_name. 922 args.in_args[0].value = entry->d_name.name;
926 args.in_args[1].size = len; 923 args.in_args[1].size = len;
927 args.in_args[1].value = link; 924 args.in_args[1].value = link;
928 return create_new_entry(fm, &args, dir 925 return create_new_entry(fm, &args, dir, entry, S_IFLNK);
929 } 926 }
930 927
931 void fuse_flush_time_update(struct inode *inod 928 void fuse_flush_time_update(struct inode *inode)
932 { 929 {
933 int err = sync_inode_metadata(inode, 1 930 int err = sync_inode_metadata(inode, 1);
934 931
935 mapping_set_error(inode->i_mapping, er 932 mapping_set_error(inode->i_mapping, err);
936 } 933 }
937 934
938 static void fuse_update_ctime_in_cache(struct 935 static void fuse_update_ctime_in_cache(struct inode *inode)
939 { 936 {
940 if (!IS_NOCMTIME(inode)) { 937 if (!IS_NOCMTIME(inode)) {
941 inode_set_ctime_current(inode) !! 938 inode->i_ctime = current_time(inode);
942 mark_inode_dirty_sync(inode); 939 mark_inode_dirty_sync(inode);
943 fuse_flush_time_update(inode); 940 fuse_flush_time_update(inode);
944 } 941 }
945 } 942 }
946 943
947 void fuse_update_ctime(struct inode *inode) 944 void fuse_update_ctime(struct inode *inode)
948 { 945 {
949 fuse_invalidate_attr_mask(inode, STATX 946 fuse_invalidate_attr_mask(inode, STATX_CTIME);
950 fuse_update_ctime_in_cache(inode); 947 fuse_update_ctime_in_cache(inode);
951 } 948 }
952 949
953 static void fuse_entry_unlinked(struct dentry 950 static void fuse_entry_unlinked(struct dentry *entry)
954 { 951 {
955 struct inode *inode = d_inode(entry); 952 struct inode *inode = d_inode(entry);
956 struct fuse_conn *fc = get_fuse_conn(i 953 struct fuse_conn *fc = get_fuse_conn(inode);
957 struct fuse_inode *fi = get_fuse_inode 954 struct fuse_inode *fi = get_fuse_inode(inode);
958 955
959 spin_lock(&fi->lock); 956 spin_lock(&fi->lock);
960 fi->attr_version = atomic64_inc_return 957 fi->attr_version = atomic64_inc_return(&fc->attr_version);
961 /* 958 /*
962 * If i_nlink == 0 then unlink doesn't 959 * If i_nlink == 0 then unlink doesn't make sense, yet this can
963 * happen if userspace filesystem is c 960 * happen if userspace filesystem is careless. It would be
964 * difficult to enforce correct nlink 961 * difficult to enforce correct nlink usage so just ignore this
965 * condition here 962 * condition here
966 */ 963 */
967 if (S_ISDIR(inode->i_mode)) 964 if (S_ISDIR(inode->i_mode))
968 clear_nlink(inode); 965 clear_nlink(inode);
969 else if (inode->i_nlink > 0) 966 else if (inode->i_nlink > 0)
970 drop_nlink(inode); 967 drop_nlink(inode);
971 spin_unlock(&fi->lock); 968 spin_unlock(&fi->lock);
972 fuse_invalidate_entry_cache(entry); 969 fuse_invalidate_entry_cache(entry);
973 fuse_update_ctime(inode); 970 fuse_update_ctime(inode);
974 } 971 }
975 972
976 static int fuse_unlink(struct inode *dir, stru 973 static int fuse_unlink(struct inode *dir, struct dentry *entry)
977 { 974 {
978 int err; 975 int err;
979 struct fuse_mount *fm = get_fuse_mount 976 struct fuse_mount *fm = get_fuse_mount(dir);
980 FUSE_ARGS(args); 977 FUSE_ARGS(args);
981 978
982 if (fuse_is_bad(dir)) 979 if (fuse_is_bad(dir))
983 return -EIO; 980 return -EIO;
984 981
985 args.opcode = FUSE_UNLINK; 982 args.opcode = FUSE_UNLINK;
986 args.nodeid = get_node_id(dir); 983 args.nodeid = get_node_id(dir);
987 args.in_numargs = 1; 984 args.in_numargs = 1;
988 args.in_args[0].size = entry->d_name.l 985 args.in_args[0].size = entry->d_name.len + 1;
989 args.in_args[0].value = entry->d_name. 986 args.in_args[0].value = entry->d_name.name;
990 err = fuse_simple_request(fm, &args); 987 err = fuse_simple_request(fm, &args);
991 if (!err) { 988 if (!err) {
992 fuse_dir_changed(dir); 989 fuse_dir_changed(dir);
993 fuse_entry_unlinked(entry); 990 fuse_entry_unlinked(entry);
994 } else if (err == -EINTR || err == -EN !! 991 } else if (err == -EINTR)
995 fuse_invalidate_entry(entry); 992 fuse_invalidate_entry(entry);
996 return err; 993 return err;
997 } 994 }
998 995
999 static int fuse_rmdir(struct inode *dir, struc 996 static int fuse_rmdir(struct inode *dir, struct dentry *entry)
1000 { 997 {
1001 int err; 998 int err;
1002 struct fuse_mount *fm = get_fuse_moun 999 struct fuse_mount *fm = get_fuse_mount(dir);
1003 FUSE_ARGS(args); 1000 FUSE_ARGS(args);
1004 1001
1005 if (fuse_is_bad(dir)) 1002 if (fuse_is_bad(dir))
1006 return -EIO; 1003 return -EIO;
1007 1004
1008 args.opcode = FUSE_RMDIR; 1005 args.opcode = FUSE_RMDIR;
1009 args.nodeid = get_node_id(dir); 1006 args.nodeid = get_node_id(dir);
1010 args.in_numargs = 1; 1007 args.in_numargs = 1;
1011 args.in_args[0].size = entry->d_name. 1008 args.in_args[0].size = entry->d_name.len + 1;
1012 args.in_args[0].value = entry->d_name 1009 args.in_args[0].value = entry->d_name.name;
1013 err = fuse_simple_request(fm, &args); 1010 err = fuse_simple_request(fm, &args);
1014 if (!err) { 1011 if (!err) {
1015 fuse_dir_changed(dir); 1012 fuse_dir_changed(dir);
1016 fuse_entry_unlinked(entry); 1013 fuse_entry_unlinked(entry);
1017 } else if (err == -EINTR || err == -E !! 1014 } else if (err == -EINTR)
1018 fuse_invalidate_entry(entry); 1015 fuse_invalidate_entry(entry);
1019 return err; 1016 return err;
1020 } 1017 }
1021 1018
1022 static int fuse_rename_common(struct inode *o 1019 static int fuse_rename_common(struct inode *olddir, struct dentry *oldent,
1023 struct inode *n 1020 struct inode *newdir, struct dentry *newent,
1024 unsigned int fl 1021 unsigned int flags, int opcode, size_t argsize)
1025 { 1022 {
1026 int err; 1023 int err;
1027 struct fuse_rename2_in inarg; 1024 struct fuse_rename2_in inarg;
1028 struct fuse_mount *fm = get_fuse_moun 1025 struct fuse_mount *fm = get_fuse_mount(olddir);
1029 FUSE_ARGS(args); 1026 FUSE_ARGS(args);
1030 1027
1031 memset(&inarg, 0, argsize); 1028 memset(&inarg, 0, argsize);
1032 inarg.newdir = get_node_id(newdir); 1029 inarg.newdir = get_node_id(newdir);
1033 inarg.flags = flags; 1030 inarg.flags = flags;
1034 args.opcode = opcode; 1031 args.opcode = opcode;
1035 args.nodeid = get_node_id(olddir); 1032 args.nodeid = get_node_id(olddir);
1036 args.in_numargs = 3; 1033 args.in_numargs = 3;
1037 args.in_args[0].size = argsize; 1034 args.in_args[0].size = argsize;
1038 args.in_args[0].value = &inarg; 1035 args.in_args[0].value = &inarg;
1039 args.in_args[1].size = oldent->d_name 1036 args.in_args[1].size = oldent->d_name.len + 1;
1040 args.in_args[1].value = oldent->d_nam 1037 args.in_args[1].value = oldent->d_name.name;
1041 args.in_args[2].size = newent->d_name 1038 args.in_args[2].size = newent->d_name.len + 1;
1042 args.in_args[2].value = newent->d_nam 1039 args.in_args[2].value = newent->d_name.name;
1043 err = fuse_simple_request(fm, &args); 1040 err = fuse_simple_request(fm, &args);
1044 if (!err) { 1041 if (!err) {
1045 /* ctime changes */ 1042 /* ctime changes */
1046 fuse_update_ctime(d_inode(old 1043 fuse_update_ctime(d_inode(oldent));
1047 1044
1048 if (flags & RENAME_EXCHANGE) 1045 if (flags & RENAME_EXCHANGE)
1049 fuse_update_ctime(d_i 1046 fuse_update_ctime(d_inode(newent));
1050 1047
1051 fuse_dir_changed(olddir); 1048 fuse_dir_changed(olddir);
1052 if (olddir != newdir) 1049 if (olddir != newdir)
1053 fuse_dir_changed(newd 1050 fuse_dir_changed(newdir);
1054 1051
1055 /* newent will end up negativ 1052 /* newent will end up negative */
1056 if (!(flags & RENAME_EXCHANGE 1053 if (!(flags & RENAME_EXCHANGE) && d_really_is_positive(newent))
1057 fuse_entry_unlinked(n 1054 fuse_entry_unlinked(newent);
1058 } else if (err == -EINTR || err == -E !! 1055 } else if (err == -EINTR) {
1059 /* If request was interrupted 1056 /* If request was interrupted, DEITY only knows if the
1060 rename actually took place 1057 rename actually took place. If the invalidation
1061 fails (e.g. some process h 1058 fails (e.g. some process has CWD under the renamed
1062 directory), then there can 1059 directory), then there can be inconsistency between
1063 the dcache and the real fi 1060 the dcache and the real filesystem. Tough luck. */
1064 fuse_invalidate_entry(oldent) 1061 fuse_invalidate_entry(oldent);
1065 if (d_really_is_positive(newe 1062 if (d_really_is_positive(newent))
1066 fuse_invalidate_entry 1063 fuse_invalidate_entry(newent);
1067 } 1064 }
1068 1065
1069 return err; 1066 return err;
1070 } 1067 }
1071 1068
1072 static int fuse_rename2(struct mnt_idmap *idm 1069 static int fuse_rename2(struct mnt_idmap *idmap, struct inode *olddir,
1073 struct dentry *oldent 1070 struct dentry *oldent, struct inode *newdir,
1074 struct dentry *newent 1071 struct dentry *newent, unsigned int flags)
1075 { 1072 {
1076 struct fuse_conn *fc = get_fuse_conn( 1073 struct fuse_conn *fc = get_fuse_conn(olddir);
1077 int err; 1074 int err;
1078 1075
1079 if (fuse_is_bad(olddir)) 1076 if (fuse_is_bad(olddir))
1080 return -EIO; 1077 return -EIO;
1081 1078
1082 if (flags & ~(RENAME_NOREPLACE | RENA 1079 if (flags & ~(RENAME_NOREPLACE | RENAME_EXCHANGE | RENAME_WHITEOUT))
1083 return -EINVAL; 1080 return -EINVAL;
1084 1081
1085 if (flags) { 1082 if (flags) {
1086 if (fc->no_rename2 || fc->min 1083 if (fc->no_rename2 || fc->minor < 23)
1087 return -EINVAL; 1084 return -EINVAL;
1088 1085
1089 err = fuse_rename_common(oldd 1086 err = fuse_rename_common(olddir, oldent, newdir, newent, flags,
1090 FUSE 1087 FUSE_RENAME2,
1091 size 1088 sizeof(struct fuse_rename2_in));
1092 if (err == -ENOSYS) { 1089 if (err == -ENOSYS) {
1093 fc->no_rename2 = 1; 1090 fc->no_rename2 = 1;
1094 err = -EINVAL; 1091 err = -EINVAL;
1095 } 1092 }
1096 } else { 1093 } else {
1097 err = fuse_rename_common(oldd 1094 err = fuse_rename_common(olddir, oldent, newdir, newent, 0,
1098 FUSE 1095 FUSE_RENAME,
1099 size 1096 sizeof(struct fuse_rename_in));
1100 } 1097 }
1101 1098
1102 return err; 1099 return err;
1103 } 1100 }
1104 1101
1105 static int fuse_link(struct dentry *entry, st 1102 static int fuse_link(struct dentry *entry, struct inode *newdir,
1106 struct dentry *newent) 1103 struct dentry *newent)
1107 { 1104 {
1108 int err; 1105 int err;
1109 struct fuse_link_in inarg; 1106 struct fuse_link_in inarg;
1110 struct inode *inode = d_inode(entry); 1107 struct inode *inode = d_inode(entry);
1111 struct fuse_mount *fm = get_fuse_moun 1108 struct fuse_mount *fm = get_fuse_mount(inode);
1112 FUSE_ARGS(args); 1109 FUSE_ARGS(args);
1113 1110
1114 memset(&inarg, 0, sizeof(inarg)); 1111 memset(&inarg, 0, sizeof(inarg));
1115 inarg.oldnodeid = get_node_id(inode); 1112 inarg.oldnodeid = get_node_id(inode);
1116 args.opcode = FUSE_LINK; 1113 args.opcode = FUSE_LINK;
1117 args.in_numargs = 2; 1114 args.in_numargs = 2;
1118 args.in_args[0].size = sizeof(inarg); 1115 args.in_args[0].size = sizeof(inarg);
1119 args.in_args[0].value = &inarg; 1116 args.in_args[0].value = &inarg;
1120 args.in_args[1].size = newent->d_name 1117 args.in_args[1].size = newent->d_name.len + 1;
1121 args.in_args[1].value = newent->d_nam 1118 args.in_args[1].value = newent->d_name.name;
1122 err = create_new_entry(fm, &args, new 1119 err = create_new_entry(fm, &args, newdir, newent, inode->i_mode);
1123 if (!err) 1120 if (!err)
1124 fuse_update_ctime_in_cache(in 1121 fuse_update_ctime_in_cache(inode);
1125 else if (err == -EINTR) 1122 else if (err == -EINTR)
1126 fuse_invalidate_attr(inode); 1123 fuse_invalidate_attr(inode);
1127 1124
1128 return err; 1125 return err;
1129 } 1126 }
1130 1127
1131 static void fuse_fillattr(struct inode *inode 1128 static void fuse_fillattr(struct inode *inode, struct fuse_attr *attr,
1132 struct kstat *stat) 1129 struct kstat *stat)
1133 { 1130 {
1134 unsigned int blkbits; 1131 unsigned int blkbits;
1135 struct fuse_conn *fc = get_fuse_conn( 1132 struct fuse_conn *fc = get_fuse_conn(inode);
1136 1133
1137 stat->dev = inode->i_sb->s_dev; 1134 stat->dev = inode->i_sb->s_dev;
1138 stat->ino = attr->ino; 1135 stat->ino = attr->ino;
1139 stat->mode = (inode->i_mode & S_IFMT) 1136 stat->mode = (inode->i_mode & S_IFMT) | (attr->mode & 07777);
1140 stat->nlink = attr->nlink; 1137 stat->nlink = attr->nlink;
1141 stat->uid = make_kuid(fc->user_ns, at 1138 stat->uid = make_kuid(fc->user_ns, attr->uid);
1142 stat->gid = make_kgid(fc->user_ns, at 1139 stat->gid = make_kgid(fc->user_ns, attr->gid);
1143 stat->rdev = inode->i_rdev; 1140 stat->rdev = inode->i_rdev;
1144 stat->atime.tv_sec = attr->atime; 1141 stat->atime.tv_sec = attr->atime;
1145 stat->atime.tv_nsec = attr->atimensec 1142 stat->atime.tv_nsec = attr->atimensec;
1146 stat->mtime.tv_sec = attr->mtime; 1143 stat->mtime.tv_sec = attr->mtime;
1147 stat->mtime.tv_nsec = attr->mtimensec 1144 stat->mtime.tv_nsec = attr->mtimensec;
1148 stat->ctime.tv_sec = attr->ctime; 1145 stat->ctime.tv_sec = attr->ctime;
1149 stat->ctime.tv_nsec = attr->ctimensec 1146 stat->ctime.tv_nsec = attr->ctimensec;
1150 stat->size = attr->size; 1147 stat->size = attr->size;
1151 stat->blocks = attr->blocks; 1148 stat->blocks = attr->blocks;
1152 1149
1153 if (attr->blksize != 0) 1150 if (attr->blksize != 0)
1154 blkbits = ilog2(attr->blksize 1151 blkbits = ilog2(attr->blksize);
1155 else 1152 else
1156 blkbits = inode->i_sb->s_bloc 1153 blkbits = inode->i_sb->s_blocksize_bits;
1157 1154
1158 stat->blksize = 1 << blkbits; 1155 stat->blksize = 1 << blkbits;
1159 } 1156 }
1160 1157
1161 static void fuse_statx_to_attr(struct fuse_st <<
1162 { <<
1163 memset(attr, 0, sizeof(*attr)); <<
1164 attr->ino = sx->ino; <<
1165 attr->size = sx->size; <<
1166 attr->blocks = sx->blocks; <<
1167 attr->atime = sx->atime.tv_sec; <<
1168 attr->mtime = sx->mtime.tv_sec; <<
1169 attr->ctime = sx->ctime.tv_sec; <<
1170 attr->atimensec = sx->atime.tv_nsec; <<
1171 attr->mtimensec = sx->mtime.tv_nsec; <<
1172 attr->ctimensec = sx->ctime.tv_nsec; <<
1173 attr->mode = sx->mode; <<
1174 attr->nlink = sx->nlink; <<
1175 attr->uid = sx->uid; <<
1176 attr->gid = sx->gid; <<
1177 attr->rdev = new_encode_dev(MKDEV(sx- <<
1178 attr->blksize = sx->blksize; <<
1179 } <<
1180 <<
1181 static int fuse_do_statx(struct inode *inode, <<
1182 struct kstat *stat) <<
1183 { <<
1184 int err; <<
1185 struct fuse_attr attr; <<
1186 struct fuse_statx *sx; <<
1187 struct fuse_statx_in inarg; <<
1188 struct fuse_statx_out outarg; <<
1189 struct fuse_mount *fm = get_fuse_moun <<
1190 u64 attr_version = fuse_get_attr_vers <<
1191 FUSE_ARGS(args); <<
1192 <<
1193 memset(&inarg, 0, sizeof(inarg)); <<
1194 memset(&outarg, 0, sizeof(outarg)); <<
1195 /* Directories have separate file-han <<
1196 if (file && S_ISREG(inode->i_mode)) { <<
1197 struct fuse_file *ff = file-> <<
1198 <<
1199 inarg.getattr_flags |= FUSE_G <<
1200 inarg.fh = ff->fh; <<
1201 } <<
1202 /* For now leave sync hints as the de <<
1203 inarg.sx_flags = 0; <<
1204 inarg.sx_mask = STATX_BASIC_STATS | S <<
1205 args.opcode = FUSE_STATX; <<
1206 args.nodeid = get_node_id(inode); <<
1207 args.in_numargs = 1; <<
1208 args.in_args[0].size = sizeof(inarg); <<
1209 args.in_args[0].value = &inarg; <<
1210 args.out_numargs = 1; <<
1211 args.out_args[0].size = sizeof(outarg <<
1212 args.out_args[0].value = &outarg; <<
1213 err = fuse_simple_request(fm, &args); <<
1214 if (err) <<
1215 return err; <<
1216 <<
1217 sx = &outarg.stat; <<
1218 if (((sx->mask & STATX_SIZE) && !fuse <<
1219 ((sx->mask & STATX_TYPE) && (!fus <<
1220 inod <<
1221 fuse_make_bad(inode); <<
1222 return -EIO; <<
1223 } <<
1224 <<
1225 fuse_statx_to_attr(&outarg.stat, &att <<
1226 if ((sx->mask & STATX_BASIC_STATS) == <<
1227 fuse_change_attributes(inode, <<
1228 ATTR_T <<
1229 } <<
1230 <<
1231 if (stat) { <<
1232 stat->result_mask = sx->mask <<
1233 stat->btime.tv_sec = sx->btim <<
1234 stat->btime.tv_nsec = min_t(u <<
1235 fuse_fillattr(inode, &attr, s <<
1236 stat->result_mask |= STATX_TY <<
1237 } <<
1238 <<
1239 return 0; <<
1240 } <<
1241 <<
1242 static int fuse_do_getattr(struct inode *inod 1158 static int fuse_do_getattr(struct inode *inode, struct kstat *stat,
1243 struct file *file) 1159 struct file *file)
1244 { 1160 {
1245 int err; 1161 int err;
1246 struct fuse_getattr_in inarg; 1162 struct fuse_getattr_in inarg;
1247 struct fuse_attr_out outarg; 1163 struct fuse_attr_out outarg;
1248 struct fuse_mount *fm = get_fuse_moun 1164 struct fuse_mount *fm = get_fuse_mount(inode);
1249 FUSE_ARGS(args); 1165 FUSE_ARGS(args);
1250 u64 attr_version; 1166 u64 attr_version;
1251 1167
1252 attr_version = fuse_get_attr_version( 1168 attr_version = fuse_get_attr_version(fm->fc);
1253 1169
1254 memset(&inarg, 0, sizeof(inarg)); 1170 memset(&inarg, 0, sizeof(inarg));
1255 memset(&outarg, 0, sizeof(outarg)); 1171 memset(&outarg, 0, sizeof(outarg));
1256 /* Directories have separate file-han 1172 /* Directories have separate file-handle space */
1257 if (file && S_ISREG(inode->i_mode)) { 1173 if (file && S_ISREG(inode->i_mode)) {
1258 struct fuse_file *ff = file-> 1174 struct fuse_file *ff = file->private_data;
1259 1175
1260 inarg.getattr_flags |= FUSE_G 1176 inarg.getattr_flags |= FUSE_GETATTR_FH;
1261 inarg.fh = ff->fh; 1177 inarg.fh = ff->fh;
1262 } 1178 }
1263 args.opcode = FUSE_GETATTR; 1179 args.opcode = FUSE_GETATTR;
1264 args.nodeid = get_node_id(inode); 1180 args.nodeid = get_node_id(inode);
1265 args.in_numargs = 1; 1181 args.in_numargs = 1;
1266 args.in_args[0].size = sizeof(inarg); 1182 args.in_args[0].size = sizeof(inarg);
1267 args.in_args[0].value = &inarg; 1183 args.in_args[0].value = &inarg;
1268 args.out_numargs = 1; 1184 args.out_numargs = 1;
1269 args.out_args[0].size = sizeof(outarg 1185 args.out_args[0].size = sizeof(outarg);
1270 args.out_args[0].value = &outarg; 1186 args.out_args[0].value = &outarg;
1271 err = fuse_simple_request(fm, &args); 1187 err = fuse_simple_request(fm, &args);
1272 if (!err) { 1188 if (!err) {
1273 if (fuse_invalid_attr(&outarg 1189 if (fuse_invalid_attr(&outarg.attr) ||
1274 inode_wrong_type(inode, o 1190 inode_wrong_type(inode, outarg.attr.mode)) {
1275 fuse_make_bad(inode); 1191 fuse_make_bad(inode);
1276 err = -EIO; 1192 err = -EIO;
1277 } else { 1193 } else {
1278 fuse_change_attribute !! 1194 fuse_change_attributes(inode, &outarg.attr,
1279 !! 1195 attr_timeout(&outarg),
1280 1196 attr_version);
1281 if (stat) 1197 if (stat)
1282 fuse_fillattr 1198 fuse_fillattr(inode, &outarg.attr, stat);
1283 } 1199 }
1284 } 1200 }
1285 return err; 1201 return err;
1286 } 1202 }
1287 1203
1288 static int fuse_update_get_attr(struct inode 1204 static int fuse_update_get_attr(struct inode *inode, struct file *file,
1289 struct kstat 1205 struct kstat *stat, u32 request_mask,
1290 unsigned int 1206 unsigned int flags)
1291 { 1207 {
1292 struct fuse_inode *fi = get_fuse_inod 1208 struct fuse_inode *fi = get_fuse_inode(inode);
1293 struct fuse_conn *fc = get_fuse_conn( <<
1294 int err = 0; 1209 int err = 0;
1295 bool sync; 1210 bool sync;
1296 u32 inval_mask = READ_ONCE(fi->inval_ 1211 u32 inval_mask = READ_ONCE(fi->inval_mask);
1297 u32 cache_mask = fuse_get_cache_mask( 1212 u32 cache_mask = fuse_get_cache_mask(inode);
1298 1213
1299 !! 1214 if (flags & AT_STATX_FORCE_SYNC)
1300 /* FUSE only supports basic stats and <<
1301 request_mask &= STATX_BASIC_STATS | S <<
1302 retry: <<
1303 if (fc->no_statx) <<
1304 request_mask &= STATX_BASIC_S <<
1305 <<
1306 if (!request_mask) <<
1307 sync = false; <<
1308 else if (flags & AT_STATX_FORCE_SYNC) <<
1309 sync = true; 1215 sync = true;
1310 else if (flags & AT_STATX_DONT_SYNC) 1216 else if (flags & AT_STATX_DONT_SYNC)
1311 sync = false; 1217 sync = false;
1312 else if (request_mask & inval_mask & 1218 else if (request_mask & inval_mask & ~cache_mask)
1313 sync = true; 1219 sync = true;
1314 else 1220 else
1315 sync = time_before64(fi->i_ti 1221 sync = time_before64(fi->i_time, get_jiffies_64());
1316 1222
1317 if (sync) { 1223 if (sync) {
1318 forget_all_cached_acls(inode) 1224 forget_all_cached_acls(inode);
1319 /* Try statx if BTIME is requ !! 1225 err = fuse_do_getattr(inode, stat, file);
1320 if (!fc->no_statx && (request <<
1321 err = fuse_do_statx(i <<
1322 if (err == -ENOSYS) { <<
1323 fc->no_statx <<
1324 err = 0; <<
1325 goto retry; <<
1326 } <<
1327 } else { <<
1328 err = fuse_do_getattr <<
1329 } <<
1330 } else if (stat) { 1226 } else if (stat) {
1331 generic_fillattr(&nop_mnt_idm !! 1227 generic_fillattr(&nop_mnt_idmap, inode, stat);
1332 stat->mode = fi->orig_i_mode; 1228 stat->mode = fi->orig_i_mode;
1333 stat->ino = fi->orig_ino; 1229 stat->ino = fi->orig_ino;
1334 if (test_bit(FUSE_I_BTIME, &f <<
1335 stat->btime = fi->i_b <<
1336 stat->result_mask |= <<
1337 } <<
1338 } 1230 }
1339 1231
1340 return err; 1232 return err;
1341 } 1233 }
1342 1234
1343 int fuse_update_attributes(struct inode *inod 1235 int fuse_update_attributes(struct inode *inode, struct file *file, u32 mask)
1344 { 1236 {
1345 return fuse_update_get_attr(inode, fi 1237 return fuse_update_get_attr(inode, file, NULL, mask, 0);
1346 } 1238 }
1347 1239
1348 int fuse_reverse_inval_entry(struct fuse_conn 1240 int fuse_reverse_inval_entry(struct fuse_conn *fc, u64 parent_nodeid,
1349 u64 child_nodeid 1241 u64 child_nodeid, struct qstr *name, u32 flags)
1350 { 1242 {
1351 int err = -ENOTDIR; 1243 int err = -ENOTDIR;
1352 struct inode *parent; 1244 struct inode *parent;
1353 struct dentry *dir; 1245 struct dentry *dir;
1354 struct dentry *entry; 1246 struct dentry *entry;
1355 1247
1356 parent = fuse_ilookup(fc, parent_node 1248 parent = fuse_ilookup(fc, parent_nodeid, NULL);
1357 if (!parent) 1249 if (!parent)
1358 return -ENOENT; 1250 return -ENOENT;
1359 1251
1360 inode_lock_nested(parent, I_MUTEX_PAR 1252 inode_lock_nested(parent, I_MUTEX_PARENT);
1361 if (!S_ISDIR(parent->i_mode)) 1253 if (!S_ISDIR(parent->i_mode))
1362 goto unlock; 1254 goto unlock;
1363 1255
1364 err = -ENOENT; 1256 err = -ENOENT;
1365 dir = d_find_alias(parent); 1257 dir = d_find_alias(parent);
1366 if (!dir) 1258 if (!dir)
1367 goto unlock; 1259 goto unlock;
1368 1260
1369 name->hash = full_name_hash(dir, name 1261 name->hash = full_name_hash(dir, name->name, name->len);
1370 entry = d_lookup(dir, name); 1262 entry = d_lookup(dir, name);
1371 dput(dir); 1263 dput(dir);
1372 if (!entry) 1264 if (!entry)
1373 goto unlock; 1265 goto unlock;
1374 1266
1375 fuse_dir_changed(parent); 1267 fuse_dir_changed(parent);
1376 if (!(flags & FUSE_EXPIRE_ONLY)) 1268 if (!(flags & FUSE_EXPIRE_ONLY))
1377 d_invalidate(entry); 1269 d_invalidate(entry);
1378 fuse_invalidate_entry_cache(entry); 1270 fuse_invalidate_entry_cache(entry);
1379 1271
1380 if (child_nodeid != 0 && d_really_is_ 1272 if (child_nodeid != 0 && d_really_is_positive(entry)) {
1381 inode_lock(d_inode(entry)); 1273 inode_lock(d_inode(entry));
1382 if (get_node_id(d_inode(entry 1274 if (get_node_id(d_inode(entry)) != child_nodeid) {
1383 err = -ENOENT; 1275 err = -ENOENT;
1384 goto badentry; 1276 goto badentry;
1385 } 1277 }
1386 if (d_mountpoint(entry)) { 1278 if (d_mountpoint(entry)) {
1387 err = -EBUSY; 1279 err = -EBUSY;
1388 goto badentry; 1280 goto badentry;
1389 } 1281 }
1390 if (d_is_dir(entry)) { 1282 if (d_is_dir(entry)) {
1391 shrink_dcache_parent( 1283 shrink_dcache_parent(entry);
1392 if (!simple_empty(ent 1284 if (!simple_empty(entry)) {
1393 err = -ENOTEM 1285 err = -ENOTEMPTY;
1394 goto badentry 1286 goto badentry;
1395 } 1287 }
1396 d_inode(entry)->i_fla 1288 d_inode(entry)->i_flags |= S_DEAD;
1397 } 1289 }
1398 dont_mount(entry); 1290 dont_mount(entry);
1399 clear_nlink(d_inode(entry)); 1291 clear_nlink(d_inode(entry));
1400 err = 0; 1292 err = 0;
1401 badentry: 1293 badentry:
1402 inode_unlock(d_inode(entry)); 1294 inode_unlock(d_inode(entry));
1403 if (!err) 1295 if (!err)
1404 d_delete(entry); 1296 d_delete(entry);
1405 } else { 1297 } else {
1406 err = 0; 1298 err = 0;
1407 } 1299 }
1408 dput(entry); 1300 dput(entry);
1409 1301
1410 unlock: 1302 unlock:
1411 inode_unlock(parent); 1303 inode_unlock(parent);
1412 iput(parent); 1304 iput(parent);
1413 return err; 1305 return err;
1414 } 1306 }
1415 1307
1416 static inline bool fuse_permissible_uidgid(st 1308 static inline bool fuse_permissible_uidgid(struct fuse_conn *fc)
1417 { 1309 {
1418 const struct cred *cred = current_cre 1310 const struct cred *cred = current_cred();
1419 1311
1420 return (uid_eq(cred->euid, fc->user_i 1312 return (uid_eq(cred->euid, fc->user_id) &&
1421 uid_eq(cred->suid, fc->user_i 1313 uid_eq(cred->suid, fc->user_id) &&
1422 uid_eq(cred->uid, fc->user_i 1314 uid_eq(cred->uid, fc->user_id) &&
1423 gid_eq(cred->egid, fc->group_ 1315 gid_eq(cred->egid, fc->group_id) &&
1424 gid_eq(cred->sgid, fc->group_ 1316 gid_eq(cred->sgid, fc->group_id) &&
1425 gid_eq(cred->gid, fc->group_ 1317 gid_eq(cred->gid, fc->group_id));
1426 } 1318 }
1427 1319
1428 /* 1320 /*
1429 * Calling into a user-controlled filesystem 1321 * Calling into a user-controlled filesystem gives the filesystem
1430 * daemon ptrace-like capabilities over the c 1322 * daemon ptrace-like capabilities over the current process. This
1431 * means, that the filesystem daemon is able 1323 * means, that the filesystem daemon is able to record the exact
1432 * filesystem operations performed, and can a 1324 * filesystem operations performed, and can also control the behavior
1433 * of the requester process in otherwise impo 1325 * of the requester process in otherwise impossible ways. For example
1434 * it can delay the operation for arbitrary l 1326 * it can delay the operation for arbitrary length of time allowing
1435 * DoS against the requester. 1327 * DoS against the requester.
1436 * 1328 *
1437 * For this reason only those processes can c 1329 * For this reason only those processes can call into the filesystem,
1438 * for which the owner of the mount has ptrac 1330 * for which the owner of the mount has ptrace privilege. This
1439 * excludes processes started by other users, 1331 * excludes processes started by other users, suid or sgid processes.
1440 */ 1332 */
1441 bool fuse_allow_current_process(struct fuse_c 1333 bool fuse_allow_current_process(struct fuse_conn *fc)
1442 { 1334 {
1443 bool allow; 1335 bool allow;
1444 1336
1445 if (fc->allow_other) 1337 if (fc->allow_other)
1446 allow = current_in_userns(fc- 1338 allow = current_in_userns(fc->user_ns);
1447 else 1339 else
1448 allow = fuse_permissible_uidg 1340 allow = fuse_permissible_uidgid(fc);
1449 1341
1450 if (!allow && allow_sys_admin_access 1342 if (!allow && allow_sys_admin_access && capable(CAP_SYS_ADMIN))
1451 allow = true; 1343 allow = true;
1452 1344
1453 return allow; 1345 return allow;
1454 } 1346 }
1455 1347
1456 static int fuse_access(struct inode *inode, i 1348 static int fuse_access(struct inode *inode, int mask)
1457 { 1349 {
1458 struct fuse_mount *fm = get_fuse_moun 1350 struct fuse_mount *fm = get_fuse_mount(inode);
1459 FUSE_ARGS(args); 1351 FUSE_ARGS(args);
1460 struct fuse_access_in inarg; 1352 struct fuse_access_in inarg;
1461 int err; 1353 int err;
1462 1354
1463 BUG_ON(mask & MAY_NOT_BLOCK); 1355 BUG_ON(mask & MAY_NOT_BLOCK);
1464 1356
1465 if (fm->fc->no_access) 1357 if (fm->fc->no_access)
1466 return 0; 1358 return 0;
1467 1359
1468 memset(&inarg, 0, sizeof(inarg)); 1360 memset(&inarg, 0, sizeof(inarg));
1469 inarg.mask = mask & (MAY_READ | MAY_W 1361 inarg.mask = mask & (MAY_READ | MAY_WRITE | MAY_EXEC);
1470 args.opcode = FUSE_ACCESS; 1362 args.opcode = FUSE_ACCESS;
1471 args.nodeid = get_node_id(inode); 1363 args.nodeid = get_node_id(inode);
1472 args.in_numargs = 1; 1364 args.in_numargs = 1;
1473 args.in_args[0].size = sizeof(inarg); 1365 args.in_args[0].size = sizeof(inarg);
1474 args.in_args[0].value = &inarg; 1366 args.in_args[0].value = &inarg;
1475 err = fuse_simple_request(fm, &args); 1367 err = fuse_simple_request(fm, &args);
1476 if (err == -ENOSYS) { 1368 if (err == -ENOSYS) {
1477 fm->fc->no_access = 1; 1369 fm->fc->no_access = 1;
1478 err = 0; 1370 err = 0;
1479 } 1371 }
1480 return err; 1372 return err;
1481 } 1373 }
1482 1374
1483 static int fuse_perm_getattr(struct inode *in 1375 static int fuse_perm_getattr(struct inode *inode, int mask)
1484 { 1376 {
1485 if (mask & MAY_NOT_BLOCK) 1377 if (mask & MAY_NOT_BLOCK)
1486 return -ECHILD; 1378 return -ECHILD;
1487 1379
1488 forget_all_cached_acls(inode); 1380 forget_all_cached_acls(inode);
1489 return fuse_do_getattr(inode, NULL, N 1381 return fuse_do_getattr(inode, NULL, NULL);
1490 } 1382 }
1491 1383
1492 /* 1384 /*
1493 * Check permission. The two basic access mo 1385 * Check permission. The two basic access models of FUSE are:
1494 * 1386 *
1495 * 1) Local access checking ('default_permiss 1387 * 1) Local access checking ('default_permissions' mount option) based
1496 * on file mode. This is the plain old disk 1388 * on file mode. This is the plain old disk filesystem permission
1497 * model. !! 1389 * modell.
1498 * 1390 *
1499 * 2) "Remote" access checking, where server 1391 * 2) "Remote" access checking, where server is responsible for
1500 * checking permission in each inode operatio 1392 * checking permission in each inode operation. An exception to this
1501 * is if ->permission() was invoked from sys_ 1393 * is if ->permission() was invoked from sys_access() in which case an
1502 * access request is sent. Execute permissio 1394 * access request is sent. Execute permission is still checked
1503 * locally based on file mode. 1395 * locally based on file mode.
1504 */ 1396 */
1505 static int fuse_permission(struct mnt_idmap * 1397 static int fuse_permission(struct mnt_idmap *idmap,
1506 struct inode *inod 1398 struct inode *inode, int mask)
1507 { 1399 {
1508 struct fuse_conn *fc = get_fuse_conn( 1400 struct fuse_conn *fc = get_fuse_conn(inode);
1509 bool refreshed = false; 1401 bool refreshed = false;
1510 int err = 0; 1402 int err = 0;
1511 1403
1512 if (fuse_is_bad(inode)) 1404 if (fuse_is_bad(inode))
1513 return -EIO; 1405 return -EIO;
1514 1406
1515 if (!fuse_allow_current_process(fc)) 1407 if (!fuse_allow_current_process(fc))
1516 return -EACCES; 1408 return -EACCES;
1517 1409
1518 /* 1410 /*
1519 * If attributes are needed, refresh 1411 * If attributes are needed, refresh them before proceeding
1520 */ 1412 */
1521 if (fc->default_permissions || 1413 if (fc->default_permissions ||
1522 ((mask & MAY_EXEC) && S_ISREG(ino 1414 ((mask & MAY_EXEC) && S_ISREG(inode->i_mode))) {
1523 struct fuse_inode *fi = get_f 1415 struct fuse_inode *fi = get_fuse_inode(inode);
1524 u32 perm_mask = STATX_MODE | 1416 u32 perm_mask = STATX_MODE | STATX_UID | STATX_GID;
1525 1417
1526 if (perm_mask & READ_ONCE(fi- 1418 if (perm_mask & READ_ONCE(fi->inval_mask) ||
1527 time_before64(fi->i_time, 1419 time_before64(fi->i_time, get_jiffies_64())) {
1528 refreshed = true; 1420 refreshed = true;
1529 1421
1530 err = fuse_perm_getat 1422 err = fuse_perm_getattr(inode, mask);
1531 if (err) 1423 if (err)
1532 return err; 1424 return err;
1533 } 1425 }
1534 } 1426 }
1535 1427
1536 if (fc->default_permissions) { 1428 if (fc->default_permissions) {
1537 err = generic_permission(&nop 1429 err = generic_permission(&nop_mnt_idmap, inode, mask);
1538 1430
1539 /* If permission is denied, t 1431 /* If permission is denied, try to refresh file
1540 attributes. This is also 1432 attributes. This is also needed, because the root
1541 node will at first have no 1433 node will at first have no permissions */
1542 if (err == -EACCES && !refres 1434 if (err == -EACCES && !refreshed) {
1543 err = fuse_perm_getat 1435 err = fuse_perm_getattr(inode, mask);
1544 if (!err) 1436 if (!err)
1545 err = generic 1437 err = generic_permission(&nop_mnt_idmap,
1546 1438 inode, mask);
1547 } 1439 }
1548 1440
1549 /* Note: the opposite of the 1441 /* Note: the opposite of the above test does not
1550 exist. So if permissions 1442 exist. So if permissions are revoked this won't be
1551 noticed immediately, only 1443 noticed immediately, only after the attribute
1552 timeout has expired */ 1444 timeout has expired */
1553 } else if (mask & (MAY_ACCESS | MAY_C 1445 } else if (mask & (MAY_ACCESS | MAY_CHDIR)) {
1554 err = fuse_access(inode, mask 1446 err = fuse_access(inode, mask);
1555 } else if ((mask & MAY_EXEC) && S_ISR 1447 } else if ((mask & MAY_EXEC) && S_ISREG(inode->i_mode)) {
1556 if (!(inode->i_mode & S_IXUGO 1448 if (!(inode->i_mode & S_IXUGO)) {
1557 if (refreshed) 1449 if (refreshed)
1558 return -EACCE 1450 return -EACCES;
1559 1451
1560 err = fuse_perm_getat 1452 err = fuse_perm_getattr(inode, mask);
1561 if (!err && !(inode-> 1453 if (!err && !(inode->i_mode & S_IXUGO))
1562 return -EACCE 1454 return -EACCES;
1563 } 1455 }
1564 } 1456 }
1565 return err; 1457 return err;
1566 } 1458 }
1567 1459
1568 static int fuse_readlink_page(struct inode *i 1460 static int fuse_readlink_page(struct inode *inode, struct page *page)
1569 { 1461 {
1570 struct fuse_mount *fm = get_fuse_moun 1462 struct fuse_mount *fm = get_fuse_mount(inode);
1571 struct fuse_page_desc desc = { .lengt 1463 struct fuse_page_desc desc = { .length = PAGE_SIZE - 1 };
1572 struct fuse_args_pages ap = { 1464 struct fuse_args_pages ap = {
1573 .num_pages = 1, 1465 .num_pages = 1,
1574 .pages = &page, 1466 .pages = &page,
1575 .descs = &desc, 1467 .descs = &desc,
1576 }; 1468 };
1577 char *link; 1469 char *link;
1578 ssize_t res; 1470 ssize_t res;
1579 1471
1580 ap.args.opcode = FUSE_READLINK; 1472 ap.args.opcode = FUSE_READLINK;
1581 ap.args.nodeid = get_node_id(inode); 1473 ap.args.nodeid = get_node_id(inode);
1582 ap.args.out_pages = true; 1474 ap.args.out_pages = true;
1583 ap.args.out_argvar = true; 1475 ap.args.out_argvar = true;
1584 ap.args.page_zeroing = true; 1476 ap.args.page_zeroing = true;
1585 ap.args.out_numargs = 1; 1477 ap.args.out_numargs = 1;
1586 ap.args.out_args[0].size = desc.lengt 1478 ap.args.out_args[0].size = desc.length;
1587 res = fuse_simple_request(fm, &ap.arg 1479 res = fuse_simple_request(fm, &ap.args);
1588 1480
1589 fuse_invalidate_atime(inode); 1481 fuse_invalidate_atime(inode);
1590 1482
1591 if (res < 0) 1483 if (res < 0)
1592 return res; 1484 return res;
1593 1485
1594 if (WARN_ON(res >= PAGE_SIZE)) 1486 if (WARN_ON(res >= PAGE_SIZE))
1595 return -EIO; 1487 return -EIO;
1596 1488
1597 link = page_address(page); 1489 link = page_address(page);
1598 link[res] = '\0'; 1490 link[res] = '\0';
1599 1491
1600 return 0; 1492 return 0;
1601 } 1493 }
1602 1494
1603 static const char *fuse_get_link(struct dentr 1495 static const char *fuse_get_link(struct dentry *dentry, struct inode *inode,
1604 struct delay 1496 struct delayed_call *callback)
1605 { 1497 {
1606 struct fuse_conn *fc = get_fuse_conn( 1498 struct fuse_conn *fc = get_fuse_conn(inode);
1607 struct page *page; 1499 struct page *page;
1608 int err; 1500 int err;
1609 1501
1610 err = -EIO; 1502 err = -EIO;
1611 if (fuse_is_bad(inode)) 1503 if (fuse_is_bad(inode))
1612 goto out_err; 1504 goto out_err;
1613 1505
1614 if (fc->cache_symlinks) 1506 if (fc->cache_symlinks)
1615 return page_get_link(dentry, 1507 return page_get_link(dentry, inode, callback);
1616 1508
1617 err = -ECHILD; 1509 err = -ECHILD;
1618 if (!dentry) 1510 if (!dentry)
1619 goto out_err; 1511 goto out_err;
1620 1512
1621 page = alloc_page(GFP_KERNEL); 1513 page = alloc_page(GFP_KERNEL);
1622 err = -ENOMEM; 1514 err = -ENOMEM;
1623 if (!page) 1515 if (!page)
1624 goto out_err; 1516 goto out_err;
1625 1517
1626 err = fuse_readlink_page(inode, page) 1518 err = fuse_readlink_page(inode, page);
1627 if (err) { 1519 if (err) {
1628 __free_page(page); 1520 __free_page(page);
1629 goto out_err; 1521 goto out_err;
1630 } 1522 }
1631 1523
1632 set_delayed_call(callback, page_put_l 1524 set_delayed_call(callback, page_put_link, page);
1633 1525
1634 return page_address(page); 1526 return page_address(page);
1635 1527
1636 out_err: 1528 out_err:
1637 return ERR_PTR(err); 1529 return ERR_PTR(err);
1638 } 1530 }
1639 1531
1640 static int fuse_dir_open(struct inode *inode, 1532 static int fuse_dir_open(struct inode *inode, struct file *file)
1641 { 1533 {
1642 struct fuse_mount *fm = get_fuse_moun !! 1534 return fuse_open_common(inode, file, true);
1643 int err; <<
1644 <<
1645 if (fuse_is_bad(inode)) <<
1646 return -EIO; <<
1647 <<
1648 err = generic_file_open(inode, file); <<
1649 if (err) <<
1650 return err; <<
1651 <<
1652 err = fuse_do_open(fm, get_node_id(in <<
1653 if (!err) { <<
1654 struct fuse_file *ff = file-> <<
1655 <<
1656 /* <<
1657 * Keep handling FOPEN_STREAM <<
1658 * directories for backward c <<
1659 * to be useful. <<
1660 */ <<
1661 if (ff->open_flags & (FOPEN_S <<
1662 nonseekable_open(inod <<
1663 } <<
1664 <<
1665 return err; <<
1666 } 1535 }
1667 1536
1668 static int fuse_dir_release(struct inode *ino 1537 static int fuse_dir_release(struct inode *inode, struct file *file)
1669 { 1538 {
1670 fuse_release_common(file, true); 1539 fuse_release_common(file, true);
1671 1540
1672 return 0; 1541 return 0;
1673 } 1542 }
1674 1543
1675 static int fuse_dir_fsync(struct file *file, 1544 static int fuse_dir_fsync(struct file *file, loff_t start, loff_t end,
1676 int datasync) 1545 int datasync)
1677 { 1546 {
1678 struct inode *inode = file->f_mapping 1547 struct inode *inode = file->f_mapping->host;
1679 struct fuse_conn *fc = get_fuse_conn( 1548 struct fuse_conn *fc = get_fuse_conn(inode);
1680 int err; 1549 int err;
1681 1550
1682 if (fuse_is_bad(inode)) 1551 if (fuse_is_bad(inode))
1683 return -EIO; 1552 return -EIO;
1684 1553
1685 if (fc->no_fsyncdir) 1554 if (fc->no_fsyncdir)
1686 return 0; 1555 return 0;
1687 1556
1688 inode_lock(inode); 1557 inode_lock(inode);
1689 err = fuse_fsync_common(file, start, 1558 err = fuse_fsync_common(file, start, end, datasync, FUSE_FSYNCDIR);
1690 if (err == -ENOSYS) { 1559 if (err == -ENOSYS) {
1691 fc->no_fsyncdir = 1; 1560 fc->no_fsyncdir = 1;
1692 err = 0; 1561 err = 0;
1693 } 1562 }
1694 inode_unlock(inode); 1563 inode_unlock(inode);
1695 1564
1696 return err; 1565 return err;
1697 } 1566 }
1698 1567
1699 static long fuse_dir_ioctl(struct file *file, 1568 static long fuse_dir_ioctl(struct file *file, unsigned int cmd,
1700 unsigned long arg 1569 unsigned long arg)
1701 { 1570 {
1702 struct fuse_conn *fc = get_fuse_conn( 1571 struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host);
1703 1572
1704 /* FUSE_IOCTL_DIR only supported for 1573 /* FUSE_IOCTL_DIR only supported for API version >= 7.18 */
1705 if (fc->minor < 18) 1574 if (fc->minor < 18)
1706 return -ENOTTY; 1575 return -ENOTTY;
1707 1576
1708 return fuse_ioctl_common(file, cmd, a 1577 return fuse_ioctl_common(file, cmd, arg, FUSE_IOCTL_DIR);
1709 } 1578 }
1710 1579
1711 static long fuse_dir_compat_ioctl(struct file 1580 static long fuse_dir_compat_ioctl(struct file *file, unsigned int cmd,
1712 unsigned l 1581 unsigned long arg)
1713 { 1582 {
1714 struct fuse_conn *fc = get_fuse_conn( 1583 struct fuse_conn *fc = get_fuse_conn(file->f_mapping->host);
1715 1584
1716 if (fc->minor < 18) 1585 if (fc->minor < 18)
1717 return -ENOTTY; 1586 return -ENOTTY;
1718 1587
1719 return fuse_ioctl_common(file, cmd, a 1588 return fuse_ioctl_common(file, cmd, arg,
1720 FUSE_IOCTL_C 1589 FUSE_IOCTL_COMPAT | FUSE_IOCTL_DIR);
1721 } 1590 }
1722 1591
1723 static bool update_mtime(unsigned ivalid, boo 1592 static bool update_mtime(unsigned ivalid, bool trust_local_mtime)
1724 { 1593 {
1725 /* Always update if mtime is explicit 1594 /* Always update if mtime is explicitly set */
1726 if (ivalid & ATTR_MTIME_SET) 1595 if (ivalid & ATTR_MTIME_SET)
1727 return true; 1596 return true;
1728 1597
1729 /* Or if kernel i_mtime is the offici 1598 /* Or if kernel i_mtime is the official one */
1730 if (trust_local_mtime) 1599 if (trust_local_mtime)
1731 return true; 1600 return true;
1732 1601
1733 /* If it's an open(O_TRUNC) or an ftr 1602 /* If it's an open(O_TRUNC) or an ftruncate(), don't update */
1734 if ((ivalid & ATTR_SIZE) && (ivalid & 1603 if ((ivalid & ATTR_SIZE) && (ivalid & (ATTR_OPEN | ATTR_FILE)))
1735 return false; 1604 return false;
1736 1605
1737 /* In all other cases update */ 1606 /* In all other cases update */
1738 return true; 1607 return true;
1739 } 1608 }
1740 1609
1741 static void iattr_to_fattr(struct fuse_conn * 1610 static void iattr_to_fattr(struct fuse_conn *fc, struct iattr *iattr,
1742 struct fuse_setatt 1611 struct fuse_setattr_in *arg, bool trust_local_cmtime)
1743 { 1612 {
1744 unsigned ivalid = iattr->ia_valid; 1613 unsigned ivalid = iattr->ia_valid;
1745 1614
1746 if (ivalid & ATTR_MODE) 1615 if (ivalid & ATTR_MODE)
1747 arg->valid |= FATTR_MODE, a 1616 arg->valid |= FATTR_MODE, arg->mode = iattr->ia_mode;
1748 if (ivalid & ATTR_UID) 1617 if (ivalid & ATTR_UID)
1749 arg->valid |= FATTR_UID, a 1618 arg->valid |= FATTR_UID, arg->uid = from_kuid(fc->user_ns, iattr->ia_uid);
1750 if (ivalid & ATTR_GID) 1619 if (ivalid & ATTR_GID)
1751 arg->valid |= FATTR_GID, a 1620 arg->valid |= FATTR_GID, arg->gid = from_kgid(fc->user_ns, iattr->ia_gid);
1752 if (ivalid & ATTR_SIZE) 1621 if (ivalid & ATTR_SIZE)
1753 arg->valid |= FATTR_SIZE, a 1622 arg->valid |= FATTR_SIZE, arg->size = iattr->ia_size;
1754 if (ivalid & ATTR_ATIME) { 1623 if (ivalid & ATTR_ATIME) {
1755 arg->valid |= FATTR_ATIME; 1624 arg->valid |= FATTR_ATIME;
1756 arg->atime = iattr->ia_atime. 1625 arg->atime = iattr->ia_atime.tv_sec;
1757 arg->atimensec = iattr->ia_at 1626 arg->atimensec = iattr->ia_atime.tv_nsec;
1758 if (!(ivalid & ATTR_ATIME_SET 1627 if (!(ivalid & ATTR_ATIME_SET))
1759 arg->valid |= FATTR_A 1628 arg->valid |= FATTR_ATIME_NOW;
1760 } 1629 }
1761 if ((ivalid & ATTR_MTIME) && update_m 1630 if ((ivalid & ATTR_MTIME) && update_mtime(ivalid, trust_local_cmtime)) {
1762 arg->valid |= FATTR_MTIME; 1631 arg->valid |= FATTR_MTIME;
1763 arg->mtime = iattr->ia_mtime. 1632 arg->mtime = iattr->ia_mtime.tv_sec;
1764 arg->mtimensec = iattr->ia_mt 1633 arg->mtimensec = iattr->ia_mtime.tv_nsec;
1765 if (!(ivalid & ATTR_MTIME_SET 1634 if (!(ivalid & ATTR_MTIME_SET) && !trust_local_cmtime)
1766 arg->valid |= FATTR_M 1635 arg->valid |= FATTR_MTIME_NOW;
1767 } 1636 }
1768 if ((ivalid & ATTR_CTIME) && trust_lo 1637 if ((ivalid & ATTR_CTIME) && trust_local_cmtime) {
1769 arg->valid |= FATTR_CTIME; 1638 arg->valid |= FATTR_CTIME;
1770 arg->ctime = iattr->ia_ctime. 1639 arg->ctime = iattr->ia_ctime.tv_sec;
1771 arg->ctimensec = iattr->ia_ct 1640 arg->ctimensec = iattr->ia_ctime.tv_nsec;
1772 } 1641 }
1773 } 1642 }
1774 1643
1775 /* 1644 /*
1776 * Prevent concurrent writepages on inode 1645 * Prevent concurrent writepages on inode
1777 * 1646 *
1778 * This is done by adding a negative bias to 1647 * This is done by adding a negative bias to the inode write counter
1779 * and waiting for all pending writes to fini 1648 * and waiting for all pending writes to finish.
1780 */ 1649 */
1781 void fuse_set_nowrite(struct inode *inode) 1650 void fuse_set_nowrite(struct inode *inode)
1782 { 1651 {
1783 struct fuse_inode *fi = get_fuse_inod 1652 struct fuse_inode *fi = get_fuse_inode(inode);
1784 1653
1785 BUG_ON(!inode_is_locked(inode)); 1654 BUG_ON(!inode_is_locked(inode));
1786 1655
1787 spin_lock(&fi->lock); 1656 spin_lock(&fi->lock);
1788 BUG_ON(fi->writectr < 0); 1657 BUG_ON(fi->writectr < 0);
1789 fi->writectr += FUSE_NOWRITE; 1658 fi->writectr += FUSE_NOWRITE;
1790 spin_unlock(&fi->lock); 1659 spin_unlock(&fi->lock);
1791 wait_event(fi->page_waitq, fi->writec 1660 wait_event(fi->page_waitq, fi->writectr == FUSE_NOWRITE);
1792 } 1661 }
1793 1662
1794 /* 1663 /*
1795 * Allow writepages on inode 1664 * Allow writepages on inode
1796 * 1665 *
1797 * Remove the bias from the writecounter and 1666 * Remove the bias from the writecounter and send any queued
1798 * writepages. 1667 * writepages.
1799 */ 1668 */
1800 static void __fuse_release_nowrite(struct ino 1669 static void __fuse_release_nowrite(struct inode *inode)
1801 { 1670 {
1802 struct fuse_inode *fi = get_fuse_inod 1671 struct fuse_inode *fi = get_fuse_inode(inode);
1803 1672
1804 BUG_ON(fi->writectr != FUSE_NOWRITE); 1673 BUG_ON(fi->writectr != FUSE_NOWRITE);
1805 fi->writectr = 0; 1674 fi->writectr = 0;
1806 fuse_flush_writepages(inode); 1675 fuse_flush_writepages(inode);
1807 } 1676 }
1808 1677
1809 void fuse_release_nowrite(struct inode *inode 1678 void fuse_release_nowrite(struct inode *inode)
1810 { 1679 {
1811 struct fuse_inode *fi = get_fuse_inod 1680 struct fuse_inode *fi = get_fuse_inode(inode);
1812 1681
1813 spin_lock(&fi->lock); 1682 spin_lock(&fi->lock);
1814 __fuse_release_nowrite(inode); 1683 __fuse_release_nowrite(inode);
1815 spin_unlock(&fi->lock); 1684 spin_unlock(&fi->lock);
1816 } 1685 }
1817 1686
1818 static void fuse_setattr_fill(struct fuse_con 1687 static void fuse_setattr_fill(struct fuse_conn *fc, struct fuse_args *args,
1819 struct inode *i 1688 struct inode *inode,
1820 struct fuse_set 1689 struct fuse_setattr_in *inarg_p,
1821 struct fuse_att 1690 struct fuse_attr_out *outarg_p)
1822 { 1691 {
1823 args->opcode = FUSE_SETATTR; 1692 args->opcode = FUSE_SETATTR;
1824 args->nodeid = get_node_id(inode); 1693 args->nodeid = get_node_id(inode);
1825 args->in_numargs = 1; 1694 args->in_numargs = 1;
1826 args->in_args[0].size = sizeof(*inarg 1695 args->in_args[0].size = sizeof(*inarg_p);
1827 args->in_args[0].value = inarg_p; 1696 args->in_args[0].value = inarg_p;
1828 args->out_numargs = 1; 1697 args->out_numargs = 1;
1829 args->out_args[0].size = sizeof(*outa 1698 args->out_args[0].size = sizeof(*outarg_p);
1830 args->out_args[0].value = outarg_p; 1699 args->out_args[0].value = outarg_p;
1831 } 1700 }
1832 1701
1833 /* 1702 /*
1834 * Flush inode->i_mtime to the server 1703 * Flush inode->i_mtime to the server
1835 */ 1704 */
1836 int fuse_flush_times(struct inode *inode, str 1705 int fuse_flush_times(struct inode *inode, struct fuse_file *ff)
1837 { 1706 {
1838 struct fuse_mount *fm = get_fuse_moun 1707 struct fuse_mount *fm = get_fuse_mount(inode);
1839 FUSE_ARGS(args); 1708 FUSE_ARGS(args);
1840 struct fuse_setattr_in inarg; 1709 struct fuse_setattr_in inarg;
1841 struct fuse_attr_out outarg; 1710 struct fuse_attr_out outarg;
1842 1711
1843 memset(&inarg, 0, sizeof(inarg)); 1712 memset(&inarg, 0, sizeof(inarg));
1844 memset(&outarg, 0, sizeof(outarg)); 1713 memset(&outarg, 0, sizeof(outarg));
1845 1714
1846 inarg.valid = FATTR_MTIME; 1715 inarg.valid = FATTR_MTIME;
1847 inarg.mtime = inode_get_mtime_sec(ino !! 1716 inarg.mtime = inode->i_mtime.tv_sec;
1848 inarg.mtimensec = inode_get_mtime_nse !! 1717 inarg.mtimensec = inode->i_mtime.tv_nsec;
1849 if (fm->fc->minor >= 23) { 1718 if (fm->fc->minor >= 23) {
1850 inarg.valid |= FATTR_CTIME; 1719 inarg.valid |= FATTR_CTIME;
1851 inarg.ctime = inode_get_ctime !! 1720 inarg.ctime = inode->i_ctime.tv_sec;
1852 inarg.ctimensec = inode_get_c !! 1721 inarg.ctimensec = inode->i_ctime.tv_nsec;
1853 } 1722 }
1854 if (ff) { 1723 if (ff) {
1855 inarg.valid |= FATTR_FH; 1724 inarg.valid |= FATTR_FH;
1856 inarg.fh = ff->fh; 1725 inarg.fh = ff->fh;
1857 } 1726 }
1858 fuse_setattr_fill(fm->fc, &args, inod 1727 fuse_setattr_fill(fm->fc, &args, inode, &inarg, &outarg);
1859 1728
1860 return fuse_simple_request(fm, &args) 1729 return fuse_simple_request(fm, &args);
1861 } 1730 }
1862 1731
1863 /* 1732 /*
1864 * Set attributes, and at the same time refre 1733 * Set attributes, and at the same time refresh them.
1865 * 1734 *
1866 * Truncation is slightly complicated, becaus 1735 * Truncation is slightly complicated, because the 'truncate' request
1867 * may fail, in which case we don't want to t 1736 * may fail, in which case we don't want to touch the mapping.
1868 * vmtruncate() doesn't allow for this case, 1737 * vmtruncate() doesn't allow for this case, so do the rlimit checking
1869 * and the actual truncation by hand. 1738 * and the actual truncation by hand.
1870 */ 1739 */
1871 int fuse_do_setattr(struct dentry *dentry, st 1740 int fuse_do_setattr(struct dentry *dentry, struct iattr *attr,
1872 struct file *file) 1741 struct file *file)
1873 { 1742 {
1874 struct inode *inode = d_inode(dentry) 1743 struct inode *inode = d_inode(dentry);
1875 struct fuse_mount *fm = get_fuse_moun 1744 struct fuse_mount *fm = get_fuse_mount(inode);
1876 struct fuse_conn *fc = fm->fc; 1745 struct fuse_conn *fc = fm->fc;
1877 struct fuse_inode *fi = get_fuse_inod 1746 struct fuse_inode *fi = get_fuse_inode(inode);
1878 struct address_space *mapping = inode 1747 struct address_space *mapping = inode->i_mapping;
1879 FUSE_ARGS(args); 1748 FUSE_ARGS(args);
1880 struct fuse_setattr_in inarg; 1749 struct fuse_setattr_in inarg;
1881 struct fuse_attr_out outarg; 1750 struct fuse_attr_out outarg;
1882 bool is_truncate = false; 1751 bool is_truncate = false;
1883 bool is_wb = fc->writeback_cache && S 1752 bool is_wb = fc->writeback_cache && S_ISREG(inode->i_mode);
1884 loff_t oldsize; 1753 loff_t oldsize;
1885 int err; 1754 int err;
1886 bool trust_local_cmtime = is_wb; 1755 bool trust_local_cmtime = is_wb;
1887 bool fault_blocked = false; 1756 bool fault_blocked = false;
1888 1757
1889 if (!fc->default_permissions) 1758 if (!fc->default_permissions)
1890 attr->ia_valid |= ATTR_FORCE; 1759 attr->ia_valid |= ATTR_FORCE;
1891 1760
1892 err = setattr_prepare(&nop_mnt_idmap, 1761 err = setattr_prepare(&nop_mnt_idmap, dentry, attr);
1893 if (err) 1762 if (err)
1894 return err; 1763 return err;
1895 1764
1896 if (attr->ia_valid & ATTR_SIZE) { 1765 if (attr->ia_valid & ATTR_SIZE) {
1897 if (WARN_ON(!S_ISREG(inode->i 1766 if (WARN_ON(!S_ISREG(inode->i_mode)))
1898 return -EIO; 1767 return -EIO;
1899 is_truncate = true; 1768 is_truncate = true;
1900 } 1769 }
1901 1770
1902 if (FUSE_IS_DAX(inode) && is_truncate 1771 if (FUSE_IS_DAX(inode) && is_truncate) {
1903 filemap_invalidate_lock(mappi 1772 filemap_invalidate_lock(mapping);
1904 fault_blocked = true; 1773 fault_blocked = true;
1905 err = fuse_dax_break_layouts( 1774 err = fuse_dax_break_layouts(inode, 0, 0);
1906 if (err) { 1775 if (err) {
1907 filemap_invalidate_un 1776 filemap_invalidate_unlock(mapping);
1908 return err; 1777 return err;
1909 } 1778 }
1910 } 1779 }
1911 1780
1912 if (attr->ia_valid & ATTR_OPEN) { 1781 if (attr->ia_valid & ATTR_OPEN) {
1913 /* This is coming from open(. 1782 /* This is coming from open(..., ... | O_TRUNC); */
1914 WARN_ON(!(attr->ia_valid & AT 1783 WARN_ON(!(attr->ia_valid & ATTR_SIZE));
1915 WARN_ON(attr->ia_size != 0); 1784 WARN_ON(attr->ia_size != 0);
1916 if (fc->atomic_o_trunc) { 1785 if (fc->atomic_o_trunc) {
1917 /* 1786 /*
1918 * No need to send re 1787 * No need to send request to userspace, since actual
1919 * truncation has alr 1788 * truncation has already been done by OPEN. But still
1920 * need to truncate p 1789 * need to truncate page cache.
1921 */ 1790 */
1922 i_size_write(inode, 0 1791 i_size_write(inode, 0);
1923 truncate_pagecache(in 1792 truncate_pagecache(inode, 0);
1924 goto out; 1793 goto out;
1925 } 1794 }
1926 file = NULL; 1795 file = NULL;
1927 } 1796 }
1928 1797
1929 /* Flush dirty data/metadata before n 1798 /* Flush dirty data/metadata before non-truncate SETATTR */
1930 if (is_wb && 1799 if (is_wb &&
1931 attr->ia_valid & 1800 attr->ia_valid &
1932 (ATTR_MODE | ATTR_UID 1801 (ATTR_MODE | ATTR_UID | ATTR_GID | ATTR_MTIME_SET |
1933 ATTR_TIMES_SET)) { 1802 ATTR_TIMES_SET)) {
1934 err = write_inode_now(inode, 1803 err = write_inode_now(inode, true);
1935 if (err) 1804 if (err)
1936 return err; 1805 return err;
1937 1806
1938 fuse_set_nowrite(inode); 1807 fuse_set_nowrite(inode);
1939 fuse_release_nowrite(inode); 1808 fuse_release_nowrite(inode);
1940 } 1809 }
1941 1810
1942 if (is_truncate) { 1811 if (is_truncate) {
1943 fuse_set_nowrite(inode); 1812 fuse_set_nowrite(inode);
1944 set_bit(FUSE_I_SIZE_UNSTABLE, 1813 set_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
1945 if (trust_local_cmtime && att 1814 if (trust_local_cmtime && attr->ia_size != inode->i_size)
1946 attr->ia_valid |= ATT 1815 attr->ia_valid |= ATTR_MTIME | ATTR_CTIME;
1947 } 1816 }
1948 1817
1949 memset(&inarg, 0, sizeof(inarg)); 1818 memset(&inarg, 0, sizeof(inarg));
1950 memset(&outarg, 0, sizeof(outarg)); 1819 memset(&outarg, 0, sizeof(outarg));
1951 iattr_to_fattr(fc, attr, &inarg, trus 1820 iattr_to_fattr(fc, attr, &inarg, trust_local_cmtime);
1952 if (file) { 1821 if (file) {
1953 struct fuse_file *ff = file-> 1822 struct fuse_file *ff = file->private_data;
1954 inarg.valid |= FATTR_FH; 1823 inarg.valid |= FATTR_FH;
1955 inarg.fh = ff->fh; 1824 inarg.fh = ff->fh;
1956 } 1825 }
1957 1826
1958 /* Kill suid/sgid for non-directory c 1827 /* Kill suid/sgid for non-directory chown unconditionally */
1959 if (fc->handle_killpriv_v2 && !S_ISDI 1828 if (fc->handle_killpriv_v2 && !S_ISDIR(inode->i_mode) &&
1960 attr->ia_valid & (ATTR_UID | ATTR 1829 attr->ia_valid & (ATTR_UID | ATTR_GID))
1961 inarg.valid |= FATTR_KILL_SUI 1830 inarg.valid |= FATTR_KILL_SUIDGID;
1962 1831
1963 if (attr->ia_valid & ATTR_SIZE) { 1832 if (attr->ia_valid & ATTR_SIZE) {
1964 /* For mandatory locking in t 1833 /* For mandatory locking in truncate */
1965 inarg.valid |= FATTR_LOCKOWNE 1834 inarg.valid |= FATTR_LOCKOWNER;
1966 inarg.lock_owner = fuse_lock_ 1835 inarg.lock_owner = fuse_lock_owner_id(fc, current->files);
1967 1836
1968 /* Kill suid/sgid for truncat 1837 /* Kill suid/sgid for truncate only if no CAP_FSETID */
1969 if (fc->handle_killpriv_v2 && 1838 if (fc->handle_killpriv_v2 && !capable(CAP_FSETID))
1970 inarg.valid |= FATTR_ 1839 inarg.valid |= FATTR_KILL_SUIDGID;
1971 } 1840 }
1972 fuse_setattr_fill(fc, &args, inode, & 1841 fuse_setattr_fill(fc, &args, inode, &inarg, &outarg);
1973 err = fuse_simple_request(fm, &args); 1842 err = fuse_simple_request(fm, &args);
1974 if (err) { 1843 if (err) {
1975 if (err == -EINTR) 1844 if (err == -EINTR)
1976 fuse_invalidate_attr( 1845 fuse_invalidate_attr(inode);
1977 goto error; 1846 goto error;
1978 } 1847 }
1979 1848
1980 if (fuse_invalid_attr(&outarg.attr) | 1849 if (fuse_invalid_attr(&outarg.attr) ||
1981 inode_wrong_type(inode, outarg.at 1850 inode_wrong_type(inode, outarg.attr.mode)) {
1982 fuse_make_bad(inode); 1851 fuse_make_bad(inode);
1983 err = -EIO; 1852 err = -EIO;
1984 goto error; 1853 goto error;
1985 } 1854 }
1986 1855
1987 spin_lock(&fi->lock); 1856 spin_lock(&fi->lock);
1988 /* the kernel maintains i_mtime local 1857 /* the kernel maintains i_mtime locally */
1989 if (trust_local_cmtime) { 1858 if (trust_local_cmtime) {
1990 if (attr->ia_valid & ATTR_MTI 1859 if (attr->ia_valid & ATTR_MTIME)
1991 inode_set_mtime_to_ts !! 1860 inode->i_mtime = attr->ia_mtime;
1992 if (attr->ia_valid & ATTR_CTI 1861 if (attr->ia_valid & ATTR_CTIME)
1993 inode_set_ctime_to_ts !! 1862 inode->i_ctime = attr->ia_ctime;
1994 /* FIXME: clear I_DIRTY_SYNC? 1863 /* FIXME: clear I_DIRTY_SYNC? */
1995 } 1864 }
1996 1865
1997 fuse_change_attributes_common(inode, !! 1866 fuse_change_attributes_common(inode, &outarg.attr,
1998 ATTR_TI !! 1867 attr_timeout(&outarg),
1999 fuse_ge 1868 fuse_get_cache_mask(inode));
2000 oldsize = inode->i_size; 1869 oldsize = inode->i_size;
2001 /* see the comment in fuse_change_att 1870 /* see the comment in fuse_change_attributes() */
2002 if (!is_wb || is_truncate) 1871 if (!is_wb || is_truncate)
2003 i_size_write(inode, outarg.at 1872 i_size_write(inode, outarg.attr.size);
2004 1873
2005 if (is_truncate) { 1874 if (is_truncate) {
2006 /* NOTE: this may release/rea 1875 /* NOTE: this may release/reacquire fi->lock */
2007 __fuse_release_nowrite(inode) 1876 __fuse_release_nowrite(inode);
2008 } 1877 }
2009 spin_unlock(&fi->lock); 1878 spin_unlock(&fi->lock);
2010 1879
2011 /* 1880 /*
2012 * Only call invalidate_inode_pages2( 1881 * Only call invalidate_inode_pages2() after removing
2013 * FUSE_NOWRITE, otherwise fuse_laund 1882 * FUSE_NOWRITE, otherwise fuse_launder_folio() would deadlock.
2014 */ 1883 */
2015 if ((is_truncate || !is_wb) && 1884 if ((is_truncate || !is_wb) &&
2016 S_ISREG(inode->i_mode) && oldsize 1885 S_ISREG(inode->i_mode) && oldsize != outarg.attr.size) {
2017 truncate_pagecache(inode, out 1886 truncate_pagecache(inode, outarg.attr.size);
2018 invalidate_inode_pages2(mappi 1887 invalidate_inode_pages2(mapping);
2019 } 1888 }
2020 1889
2021 clear_bit(FUSE_I_SIZE_UNSTABLE, &fi-> 1890 clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
2022 out: 1891 out:
2023 if (fault_blocked) 1892 if (fault_blocked)
2024 filemap_invalidate_unlock(map 1893 filemap_invalidate_unlock(mapping);
2025 1894
2026 return 0; 1895 return 0;
2027 1896
2028 error: 1897 error:
2029 if (is_truncate) 1898 if (is_truncate)
2030 fuse_release_nowrite(inode); 1899 fuse_release_nowrite(inode);
2031 1900
2032 clear_bit(FUSE_I_SIZE_UNSTABLE, &fi-> 1901 clear_bit(FUSE_I_SIZE_UNSTABLE, &fi->state);
2033 1902
2034 if (fault_blocked) 1903 if (fault_blocked)
2035 filemap_invalidate_unlock(map 1904 filemap_invalidate_unlock(mapping);
2036 return err; 1905 return err;
2037 } 1906 }
2038 1907
2039 static int fuse_setattr(struct mnt_idmap *idm 1908 static int fuse_setattr(struct mnt_idmap *idmap, struct dentry *entry,
2040 struct iattr *attr) 1909 struct iattr *attr)
2041 { 1910 {
2042 struct inode *inode = d_inode(entry); 1911 struct inode *inode = d_inode(entry);
2043 struct fuse_conn *fc = get_fuse_conn( 1912 struct fuse_conn *fc = get_fuse_conn(inode);
2044 struct file *file = (attr->ia_valid & 1913 struct file *file = (attr->ia_valid & ATTR_FILE) ? attr->ia_file : NULL;
2045 int ret; 1914 int ret;
2046 1915
2047 if (fuse_is_bad(inode)) 1916 if (fuse_is_bad(inode))
2048 return -EIO; 1917 return -EIO;
2049 1918
2050 if (!fuse_allow_current_process(get_f 1919 if (!fuse_allow_current_process(get_fuse_conn(inode)))
2051 return -EACCES; 1920 return -EACCES;
2052 1921
2053 if (attr->ia_valid & (ATTR_KILL_SUID 1922 if (attr->ia_valid & (ATTR_KILL_SUID | ATTR_KILL_SGID)) {
2054 attr->ia_valid &= ~(ATTR_KILL 1923 attr->ia_valid &= ~(ATTR_KILL_SUID | ATTR_KILL_SGID |
2055 ATTR_MODE 1924 ATTR_MODE);
2056 1925
2057 /* 1926 /*
2058 * The only sane way to relia 1927 * The only sane way to reliably kill suid/sgid is to do it in
2059 * the userspace filesystem 1928 * the userspace filesystem
2060 * 1929 *
2061 * This should be done on wri 1930 * This should be done on write(), truncate() and chown().
2062 */ 1931 */
2063 if (!fc->handle_killpriv && ! 1932 if (!fc->handle_killpriv && !fc->handle_killpriv_v2) {
2064 /* 1933 /*
2065 * ia_mode calculatio 1934 * ia_mode calculation may have used stale i_mode.
2066 * Refresh and recalc 1935 * Refresh and recalculate.
2067 */ 1936 */
2068 ret = fuse_do_getattr 1937 ret = fuse_do_getattr(inode, NULL, file);
2069 if (ret) 1938 if (ret)
2070 return ret; 1939 return ret;
2071 1940
2072 attr->ia_mode = inode 1941 attr->ia_mode = inode->i_mode;
2073 if (inode->i_mode & S 1942 if (inode->i_mode & S_ISUID) {
2074 attr->ia_vali 1943 attr->ia_valid |= ATTR_MODE;
2075 attr->ia_mode 1944 attr->ia_mode &= ~S_ISUID;
2076 } 1945 }
2077 if ((inode->i_mode & 1946 if ((inode->i_mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP)) {
2078 attr->ia_vali 1947 attr->ia_valid |= ATTR_MODE;
2079 attr->ia_mode 1948 attr->ia_mode &= ~S_ISGID;
2080 } 1949 }
2081 } 1950 }
2082 } 1951 }
2083 if (!attr->ia_valid) 1952 if (!attr->ia_valid)
2084 return 0; 1953 return 0;
2085 1954
2086 ret = fuse_do_setattr(entry, attr, fi 1955 ret = fuse_do_setattr(entry, attr, file);
2087 if (!ret) { 1956 if (!ret) {
2088 /* 1957 /*
2089 * If filesystem supports acl 1958 * If filesystem supports acls it may have updated acl xattrs in
2090 * the filesystem, so forget 1959 * the filesystem, so forget cached acls for the inode.
2091 */ 1960 */
2092 if (fc->posix_acl) 1961 if (fc->posix_acl)
2093 forget_all_cached_acl 1962 forget_all_cached_acls(inode);
2094 1963
2095 /* Directory mode changed, ma 1964 /* Directory mode changed, may need to revalidate access */
2096 if (d_is_dir(entry) && (attr- 1965 if (d_is_dir(entry) && (attr->ia_valid & ATTR_MODE))
2097 fuse_invalidate_entry 1966 fuse_invalidate_entry_cache(entry);
2098 } 1967 }
2099 return ret; 1968 return ret;
2100 } 1969 }
2101 1970
2102 static int fuse_getattr(struct mnt_idmap *idm 1971 static int fuse_getattr(struct mnt_idmap *idmap,
2103 const struct path *pa 1972 const struct path *path, struct kstat *stat,
2104 u32 request_mask, uns 1973 u32 request_mask, unsigned int flags)
2105 { 1974 {
2106 struct inode *inode = d_inode(path->d 1975 struct inode *inode = d_inode(path->dentry);
2107 struct fuse_conn *fc = get_fuse_conn( 1976 struct fuse_conn *fc = get_fuse_conn(inode);
2108 1977
2109 if (fuse_is_bad(inode)) 1978 if (fuse_is_bad(inode))
2110 return -EIO; 1979 return -EIO;
2111 1980
2112 if (!fuse_allow_current_process(fc)) 1981 if (!fuse_allow_current_process(fc)) {
2113 if (!request_mask) { 1982 if (!request_mask) {
2114 /* 1983 /*
2115 * If user explicitly 1984 * If user explicitly requested *nothing* then don't
2116 * error out, but ret 1985 * error out, but return st_dev only.
2117 */ 1986 */
2118 stat->result_mask = 0 1987 stat->result_mask = 0;
2119 stat->dev = inode->i_ 1988 stat->dev = inode->i_sb->s_dev;
2120 return 0; 1989 return 0;
2121 } 1990 }
2122 return -EACCES; 1991 return -EACCES;
2123 } 1992 }
2124 1993
2125 return fuse_update_get_attr(inode, NU 1994 return fuse_update_get_attr(inode, NULL, stat, request_mask, flags);
2126 } 1995 }
2127 1996
2128 static const struct inode_operations fuse_dir 1997 static const struct inode_operations fuse_dir_inode_operations = {
2129 .lookup = fuse_lookup, 1998 .lookup = fuse_lookup,
2130 .mkdir = fuse_mkdir, 1999 .mkdir = fuse_mkdir,
2131 .symlink = fuse_symlink, 2000 .symlink = fuse_symlink,
2132 .unlink = fuse_unlink, 2001 .unlink = fuse_unlink,
2133 .rmdir = fuse_rmdir, 2002 .rmdir = fuse_rmdir,
2134 .rename = fuse_rename2, 2003 .rename = fuse_rename2,
2135 .link = fuse_link, 2004 .link = fuse_link,
2136 .setattr = fuse_setattr, 2005 .setattr = fuse_setattr,
2137 .create = fuse_create, 2006 .create = fuse_create,
2138 .atomic_open = fuse_atomic_open, 2007 .atomic_open = fuse_atomic_open,
2139 .tmpfile = fuse_tmpfile, 2008 .tmpfile = fuse_tmpfile,
2140 .mknod = fuse_mknod, 2009 .mknod = fuse_mknod,
2141 .permission = fuse_permission, 2010 .permission = fuse_permission,
2142 .getattr = fuse_getattr, 2011 .getattr = fuse_getattr,
2143 .listxattr = fuse_listxattr, 2012 .listxattr = fuse_listxattr,
2144 .get_inode_acl = fuse_get_inode_acl, 2013 .get_inode_acl = fuse_get_inode_acl,
2145 .get_acl = fuse_get_acl, 2014 .get_acl = fuse_get_acl,
2146 .set_acl = fuse_set_acl, 2015 .set_acl = fuse_set_acl,
2147 .fileattr_get = fuse_fileattr_get, 2016 .fileattr_get = fuse_fileattr_get,
2148 .fileattr_set = fuse_fileattr_set, 2017 .fileattr_set = fuse_fileattr_set,
2149 }; 2018 };
2150 2019
2151 static const struct file_operations fuse_dir_ 2020 static const struct file_operations fuse_dir_operations = {
2152 .llseek = generic_file_llseek 2021 .llseek = generic_file_llseek,
2153 .read = generic_read_dir, 2022 .read = generic_read_dir,
2154 .iterate_shared = fuse_readdir, 2023 .iterate_shared = fuse_readdir,
2155 .open = fuse_dir_open, 2024 .open = fuse_dir_open,
2156 .release = fuse_dir_release, 2025 .release = fuse_dir_release,
2157 .fsync = fuse_dir_fsync, 2026 .fsync = fuse_dir_fsync,
2158 .unlocked_ioctl = fuse_dir_ioctl, 2027 .unlocked_ioctl = fuse_dir_ioctl,
2159 .compat_ioctl = fuse_dir_compat_ioc 2028 .compat_ioctl = fuse_dir_compat_ioctl,
2160 }; 2029 };
2161 2030
2162 static const struct inode_operations fuse_com 2031 static const struct inode_operations fuse_common_inode_operations = {
2163 .setattr = fuse_setattr, 2032 .setattr = fuse_setattr,
2164 .permission = fuse_permission, 2033 .permission = fuse_permission,
2165 .getattr = fuse_getattr, 2034 .getattr = fuse_getattr,
2166 .listxattr = fuse_listxattr, 2035 .listxattr = fuse_listxattr,
2167 .get_inode_acl = fuse_get_inode_acl, 2036 .get_inode_acl = fuse_get_inode_acl,
2168 .get_acl = fuse_get_acl, 2037 .get_acl = fuse_get_acl,
2169 .set_acl = fuse_set_acl, 2038 .set_acl = fuse_set_acl,
2170 .fileattr_get = fuse_fileattr_get, 2039 .fileattr_get = fuse_fileattr_get,
2171 .fileattr_set = fuse_fileattr_set, 2040 .fileattr_set = fuse_fileattr_set,
2172 }; 2041 };
2173 2042
2174 static const struct inode_operations fuse_sym 2043 static const struct inode_operations fuse_symlink_inode_operations = {
2175 .setattr = fuse_setattr, 2044 .setattr = fuse_setattr,
2176 .get_link = fuse_get_link, 2045 .get_link = fuse_get_link,
2177 .getattr = fuse_getattr, 2046 .getattr = fuse_getattr,
2178 .listxattr = fuse_listxattr, 2047 .listxattr = fuse_listxattr,
2179 }; 2048 };
2180 2049
2181 void fuse_init_common(struct inode *inode) 2050 void fuse_init_common(struct inode *inode)
2182 { 2051 {
2183 inode->i_op = &fuse_common_inode_oper 2052 inode->i_op = &fuse_common_inode_operations;
2184 } 2053 }
2185 2054
2186 void fuse_init_dir(struct inode *inode) 2055 void fuse_init_dir(struct inode *inode)
2187 { 2056 {
2188 struct fuse_inode *fi = get_fuse_inod 2057 struct fuse_inode *fi = get_fuse_inode(inode);
2189 2058
2190 inode->i_op = &fuse_dir_inode_operati 2059 inode->i_op = &fuse_dir_inode_operations;
2191 inode->i_fop = &fuse_dir_operations; 2060 inode->i_fop = &fuse_dir_operations;
2192 2061
2193 spin_lock_init(&fi->rdc.lock); 2062 spin_lock_init(&fi->rdc.lock);
2194 fi->rdc.cached = false; 2063 fi->rdc.cached = false;
2195 fi->rdc.size = 0; 2064 fi->rdc.size = 0;
2196 fi->rdc.pos = 0; 2065 fi->rdc.pos = 0;
2197 fi->rdc.version = 0; 2066 fi->rdc.version = 0;
2198 } 2067 }
2199 2068
2200 static int fuse_symlink_read_folio(struct fil 2069 static int fuse_symlink_read_folio(struct file *null, struct folio *folio)
2201 { 2070 {
2202 int err = fuse_readlink_page(folio->m 2071 int err = fuse_readlink_page(folio->mapping->host, &folio->page);
2203 2072
2204 if (!err) 2073 if (!err)
2205 folio_mark_uptodate(folio); 2074 folio_mark_uptodate(folio);
2206 2075
2207 folio_unlock(folio); 2076 folio_unlock(folio);
2208 2077
2209 return err; 2078 return err;
2210 } 2079 }
2211 2080
2212 static const struct address_space_operations 2081 static const struct address_space_operations fuse_symlink_aops = {
2213 .read_folio = fuse_symlink_read_f 2082 .read_folio = fuse_symlink_read_folio,
2214 }; 2083 };
2215 2084
2216 void fuse_init_symlink(struct inode *inode) 2085 void fuse_init_symlink(struct inode *inode)
2217 { 2086 {
2218 inode->i_op = &fuse_symlink_inode_ope 2087 inode->i_op = &fuse_symlink_inode_operations;
2219 inode->i_data.a_ops = &fuse_symlink_a 2088 inode->i_data.a_ops = &fuse_symlink_aops;
2220 inode_nohighmem(inode); 2089 inode_nohighmem(inode);
2221 } 2090 }
2222 2091
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