1 // SPDX-License-Identifier: GPL-2.0 1 // SPDX-License-Identifier: GPL-2.0
2 /* 2 /*
3 * linux/fs/stat.c 3 * linux/fs/stat.c
4 * 4 *
5 * Copyright (C) 1991, 1992 Linus Torvalds 5 * Copyright (C) 1991, 1992 Linus Torvalds
6 */ 6 */
7 7
8 #include <linux/blkdev.h> 8 #include <linux/blkdev.h>
9 #include <linux/export.h> 9 #include <linux/export.h>
10 #include <linux/mm.h> 10 #include <linux/mm.h>
11 #include <linux/errno.h> 11 #include <linux/errno.h>
12 #include <linux/file.h> 12 #include <linux/file.h>
13 #include <linux/highuid.h> 13 #include <linux/highuid.h>
14 #include <linux/fs.h> 14 #include <linux/fs.h>
15 #include <linux/namei.h> 15 #include <linux/namei.h>
16 #include <linux/security.h> 16 #include <linux/security.h>
17 #include <linux/cred.h> 17 #include <linux/cred.h>
18 #include <linux/syscalls.h> 18 #include <linux/syscalls.h>
19 #include <linux/pagemap.h> 19 #include <linux/pagemap.h>
20 #include <linux/compat.h> 20 #include <linux/compat.h>
21 #include <linux/iversion.h> 21 #include <linux/iversion.h>
22 22
23 #include <linux/uaccess.h> 23 #include <linux/uaccess.h>
24 #include <asm/unistd.h> 24 #include <asm/unistd.h>
25 25
26 #include "internal.h" 26 #include "internal.h"
27 #include "mount.h" 27 #include "mount.h"
28 28
29 /** 29 /**
30 * generic_fillattr - Fill in the basic attrib 30 * generic_fillattr - Fill in the basic attributes from the inode struct
31 * @idmap: idmap of the mount the !! 31 * @idmap: idmap of the mount the inode was found from
32 * @request_mask: statx request_mask !! 32 * @inode: Inode to use as the source
33 * @inode: Inode to use as the so !! 33 * @stat: Where to fill in the attributes
34 * @stat: Where to fill in the a <<
35 * 34 *
36 * Fill in the basic attributes in the kstat s 35 * Fill in the basic attributes in the kstat structure from data that's to be
37 * found on the VFS inode structure. This is 36 * found on the VFS inode structure. This is the default if no getattr inode
38 * operation is supplied. 37 * operation is supplied.
39 * 38 *
40 * If the inode has been found through an idma 39 * If the inode has been found through an idmapped mount the idmap of
41 * the vfsmount must be passed through @idmap. 40 * the vfsmount must be passed through @idmap. This function will then
42 * take care to map the inode according to @id 41 * take care to map the inode according to @idmap before filling in the
43 * uid and gid filds. On non-idmapped mounts o 42 * uid and gid filds. On non-idmapped mounts or if permission checking is to be
44 * performed on the raw inode simply pass @nop !! 43 * performed on the raw inode simply passs @nop_mnt_idmap.
45 */ 44 */
46 void generic_fillattr(struct mnt_idmap *idmap, !! 45 void generic_fillattr(struct mnt_idmap *idmap, struct inode *inode,
47 struct inode *inode, str !! 46 struct kstat *stat)
48 { 47 {
49 vfsuid_t vfsuid = i_uid_into_vfsuid(id 48 vfsuid_t vfsuid = i_uid_into_vfsuid(idmap, inode);
50 vfsgid_t vfsgid = i_gid_into_vfsgid(id 49 vfsgid_t vfsgid = i_gid_into_vfsgid(idmap, inode);
51 50
52 stat->dev = inode->i_sb->s_dev; 51 stat->dev = inode->i_sb->s_dev;
53 stat->ino = inode->i_ino; 52 stat->ino = inode->i_ino;
54 stat->mode = inode->i_mode; 53 stat->mode = inode->i_mode;
55 stat->nlink = inode->i_nlink; 54 stat->nlink = inode->i_nlink;
56 stat->uid = vfsuid_into_kuid(vfsuid); 55 stat->uid = vfsuid_into_kuid(vfsuid);
57 stat->gid = vfsgid_into_kgid(vfsgid); 56 stat->gid = vfsgid_into_kgid(vfsgid);
58 stat->rdev = inode->i_rdev; 57 stat->rdev = inode->i_rdev;
59 stat->size = i_size_read(inode); 58 stat->size = i_size_read(inode);
60 stat->atime = inode_get_atime(inode); !! 59 stat->atime = inode->i_atime;
61 stat->mtime = inode_get_mtime(inode); !! 60 stat->mtime = inode->i_mtime;
62 stat->ctime = inode_get_ctime(inode); !! 61 stat->ctime = inode->i_ctime;
63 stat->blksize = i_blocksize(inode); 62 stat->blksize = i_blocksize(inode);
64 stat->blocks = inode->i_blocks; 63 stat->blocks = inode->i_blocks;
65 <<
66 if ((request_mask & STATX_CHANGE_COOKI <<
67 stat->result_mask |= STATX_CHA <<
68 stat->change_cookie = inode_qu <<
69 } <<
70 <<
71 } 64 }
72 EXPORT_SYMBOL(generic_fillattr); 65 EXPORT_SYMBOL(generic_fillattr);
73 66
74 /** 67 /**
75 * generic_fill_statx_attr - Fill in the statx 68 * generic_fill_statx_attr - Fill in the statx attributes from the inode flags
76 * @inode: Inode to use as the source 69 * @inode: Inode to use as the source
77 * @stat: Where to fill in the attribute 70 * @stat: Where to fill in the attribute flags
78 * 71 *
79 * Fill in the STATX_ATTR_* flags in the kstat 72 * Fill in the STATX_ATTR_* flags in the kstat structure for properties of the
80 * inode that are published on i_flags and enf 73 * inode that are published on i_flags and enforced by the VFS.
81 */ 74 */
82 void generic_fill_statx_attr(struct inode *ino 75 void generic_fill_statx_attr(struct inode *inode, struct kstat *stat)
83 { 76 {
84 if (inode->i_flags & S_IMMUTABLE) 77 if (inode->i_flags & S_IMMUTABLE)
85 stat->attributes |= STATX_ATTR 78 stat->attributes |= STATX_ATTR_IMMUTABLE;
86 if (inode->i_flags & S_APPEND) 79 if (inode->i_flags & S_APPEND)
87 stat->attributes |= STATX_ATTR 80 stat->attributes |= STATX_ATTR_APPEND;
88 stat->attributes_mask |= KSTAT_ATTR_VF 81 stat->attributes_mask |= KSTAT_ATTR_VFS_FLAGS;
89 } 82 }
90 EXPORT_SYMBOL(generic_fill_statx_attr); 83 EXPORT_SYMBOL(generic_fill_statx_attr);
91 84
92 /** 85 /**
93 * generic_fill_statx_atomic_writes - Fill in <<
94 * @stat: Where to fill in the attribute <<
95 * @unit_min: Minimum supported atomic write <<
96 * @unit_max: Maximum supported atomic write <<
97 * <<
98 * Fill in the STATX{_ATTR}_WRITE_ATOMIC flags <<
99 * atomic write unit_min and unit_max values. <<
100 */ <<
101 void generic_fill_statx_atomic_writes(struct k <<
102 unsigned <<
103 unsigned <<
104 { <<
105 /* Confirm that the request type is kn <<
106 stat->result_mask |= STATX_WRITE_ATOMI <<
107 <<
108 /* Confirm that the file attribute typ <<
109 stat->attributes_mask |= STATX_ATTR_WR <<
110 <<
111 if (unit_min) { <<
112 stat->atomic_write_unit_min = <<
113 stat->atomic_write_unit_max = <<
114 /* Initially only allow 1x seg <<
115 stat->atomic_write_segments_ma <<
116 <<
117 /* Confirm atomic writes are a <<
118 stat->attributes |= STATX_ATTR <<
119 } <<
120 } <<
121 EXPORT_SYMBOL_GPL(generic_fill_statx_atomic_wr <<
122 <<
123 /** <<
124 * vfs_getattr_nosec - getattr without securit 86 * vfs_getattr_nosec - getattr without security checks
125 * @path: file to get attributes from 87 * @path: file to get attributes from
126 * @stat: structure to return attributes in 88 * @stat: structure to return attributes in
127 * @request_mask: STATX_xxx flags indicating w 89 * @request_mask: STATX_xxx flags indicating what the caller wants
128 * @query_flags: Query mode (AT_STATX_SYNC_TYP 90 * @query_flags: Query mode (AT_STATX_SYNC_TYPE)
129 * 91 *
130 * Get attributes without calling security_ino 92 * Get attributes without calling security_inode_getattr.
131 * 93 *
132 * Currently the only caller other than vfs_ge 94 * Currently the only caller other than vfs_getattr is internal to the
133 * filehandle lookup code, which uses only the 95 * filehandle lookup code, which uses only the inode number and returns no
134 * attributes to any user. Any other code pro 96 * attributes to any user. Any other code probably wants vfs_getattr.
135 */ 97 */
136 int vfs_getattr_nosec(const struct path *path, 98 int vfs_getattr_nosec(const struct path *path, struct kstat *stat,
137 u32 request_mask, unsign 99 u32 request_mask, unsigned int query_flags)
138 { 100 {
139 struct mnt_idmap *idmap; 101 struct mnt_idmap *idmap;
140 struct inode *inode = d_backing_inode( 102 struct inode *inode = d_backing_inode(path->dentry);
141 103
142 memset(stat, 0, sizeof(*stat)); 104 memset(stat, 0, sizeof(*stat));
143 stat->result_mask |= STATX_BASIC_STATS 105 stat->result_mask |= STATX_BASIC_STATS;
144 query_flags &= AT_STATX_SYNC_TYPE; 106 query_flags &= AT_STATX_SYNC_TYPE;
145 107
146 /* allow the fs to override these if i 108 /* allow the fs to override these if it really wants to */
147 /* SB_NOATIME means filesystem supplie 109 /* SB_NOATIME means filesystem supplies dummy atime value */
148 if (inode->i_sb->s_flags & SB_NOATIME) 110 if (inode->i_sb->s_flags & SB_NOATIME)
149 stat->result_mask &= ~STATX_AT 111 stat->result_mask &= ~STATX_ATIME;
150 112
151 /* 113 /*
152 * Note: If you add another clause to 114 * Note: If you add another clause to set an attribute flag, please
153 * update attributes_mask below. 115 * update attributes_mask below.
154 */ 116 */
155 if (IS_AUTOMOUNT(inode)) 117 if (IS_AUTOMOUNT(inode))
156 stat->attributes |= STATX_ATTR 118 stat->attributes |= STATX_ATTR_AUTOMOUNT;
157 119
158 if (IS_DAX(inode)) 120 if (IS_DAX(inode))
159 stat->attributes |= STATX_ATTR 121 stat->attributes |= STATX_ATTR_DAX;
160 122
161 stat->attributes_mask |= (STATX_ATTR_A 123 stat->attributes_mask |= (STATX_ATTR_AUTOMOUNT |
162 STATX_ATTR_D 124 STATX_ATTR_DAX);
163 125
>> 126 if ((request_mask & STATX_CHANGE_COOKIE) && IS_I_VERSION(inode)) {
>> 127 stat->result_mask |= STATX_CHANGE_COOKIE;
>> 128 stat->change_cookie = inode_query_iversion(inode);
>> 129 }
>> 130
164 idmap = mnt_idmap(path->mnt); 131 idmap = mnt_idmap(path->mnt);
165 if (inode->i_op->getattr) 132 if (inode->i_op->getattr)
166 return inode->i_op->getattr(id 133 return inode->i_op->getattr(idmap, path, stat,
167 re !! 134 request_mask, query_flags);
168 qu <<
169 135
170 generic_fillattr(idmap, request_mask, !! 136 generic_fillattr(idmap, inode, stat);
171 return 0; 137 return 0;
172 } 138 }
173 EXPORT_SYMBOL(vfs_getattr_nosec); 139 EXPORT_SYMBOL(vfs_getattr_nosec);
174 140
175 /* 141 /*
176 * vfs_getattr - Get the enhanced basic attrib 142 * vfs_getattr - Get the enhanced basic attributes of a file
177 * @path: The file of interest 143 * @path: The file of interest
178 * @stat: Where to return the statistics 144 * @stat: Where to return the statistics
179 * @request_mask: STATX_xxx flags indicating w 145 * @request_mask: STATX_xxx flags indicating what the caller wants
180 * @query_flags: Query mode (AT_STATX_SYNC_TYP 146 * @query_flags: Query mode (AT_STATX_SYNC_TYPE)
181 * 147 *
182 * Ask the filesystem for a file's attributes. 148 * Ask the filesystem for a file's attributes. The caller must indicate in
183 * request_mask and query_flags to indicate wh 149 * request_mask and query_flags to indicate what they want.
184 * 150 *
185 * If the file is remote, the filesystem can b 151 * If the file is remote, the filesystem can be forced to update the attributes
186 * from the backing store by passing AT_STATX_ 152 * from the backing store by passing AT_STATX_FORCE_SYNC in query_flags or can
187 * suppress the update by passing AT_STATX_DON 153 * suppress the update by passing AT_STATX_DONT_SYNC.
188 * 154 *
189 * Bits must have been set in request_mask to 155 * Bits must have been set in request_mask to indicate which attributes the
190 * caller wants retrieving. Any such attribut 156 * caller wants retrieving. Any such attribute not requested may be returned
191 * anyway, but the value may be approximate, a 157 * anyway, but the value may be approximate, and, if remote, may not have been
192 * synchronised with the server. 158 * synchronised with the server.
193 * 159 *
194 * 0 will be returned on success, and a -ve er 160 * 0 will be returned on success, and a -ve error code if unsuccessful.
195 */ 161 */
196 int vfs_getattr(const struct path *path, struc 162 int vfs_getattr(const struct path *path, struct kstat *stat,
197 u32 request_mask, unsigned int 163 u32 request_mask, unsigned int query_flags)
198 { 164 {
199 int retval; 165 int retval;
200 166
201 if (WARN_ON_ONCE(query_flags & AT_GETA <<
202 return -EPERM; <<
203 <<
204 retval = security_inode_getattr(path); 167 retval = security_inode_getattr(path);
205 if (retval) 168 if (retval)
206 return retval; 169 return retval;
207 return vfs_getattr_nosec(path, stat, r 170 return vfs_getattr_nosec(path, stat, request_mask, query_flags);
208 } 171 }
209 EXPORT_SYMBOL(vfs_getattr); 172 EXPORT_SYMBOL(vfs_getattr);
210 173
211 /** 174 /**
212 * vfs_fstat - Get the basic attributes by fil 175 * vfs_fstat - Get the basic attributes by file descriptor
213 * @fd: The file descriptor referring to the f 176 * @fd: The file descriptor referring to the file of interest
214 * @stat: The result structure to fill in. 177 * @stat: The result structure to fill in.
215 * 178 *
216 * This function is a wrapper around vfs_getat 179 * This function is a wrapper around vfs_getattr(). The main difference is
217 * that it uses a file descriptor to determine 180 * that it uses a file descriptor to determine the file location.
218 * 181 *
219 * 0 will be returned on success, and a -ve er 182 * 0 will be returned on success, and a -ve error code if unsuccessful.
220 */ 183 */
221 int vfs_fstat(int fd, struct kstat *stat) 184 int vfs_fstat(int fd, struct kstat *stat)
222 { 185 {
223 struct fd f; 186 struct fd f;
224 int error; 187 int error;
225 188
226 f = fdget_raw(fd); 189 f = fdget_raw(fd);
227 if (!f.file) 190 if (!f.file)
228 return -EBADF; 191 return -EBADF;
229 error = vfs_getattr(&f.file->f_path, s 192 error = vfs_getattr(&f.file->f_path, stat, STATX_BASIC_STATS, 0);
230 fdput(f); 193 fdput(f);
231 return error; 194 return error;
232 } 195 }
233 196
234 int getname_statx_lookup_flags(int flags) 197 int getname_statx_lookup_flags(int flags)
235 { 198 {
236 int lookup_flags = 0; 199 int lookup_flags = 0;
237 200
238 if (!(flags & AT_SYMLINK_NOFOLLOW)) 201 if (!(flags & AT_SYMLINK_NOFOLLOW))
239 lookup_flags |= LOOKUP_FOLLOW; 202 lookup_flags |= LOOKUP_FOLLOW;
240 if (!(flags & AT_NO_AUTOMOUNT)) 203 if (!(flags & AT_NO_AUTOMOUNT))
241 lookup_flags |= LOOKUP_AUTOMOU 204 lookup_flags |= LOOKUP_AUTOMOUNT;
242 if (flags & AT_EMPTY_PATH) 205 if (flags & AT_EMPTY_PATH)
243 lookup_flags |= LOOKUP_EMPTY; 206 lookup_flags |= LOOKUP_EMPTY;
244 207
245 return lookup_flags; 208 return lookup_flags;
246 } 209 }
247 210
248 static int vfs_statx_path(struct path *path, i <<
249 u32 request_mask) <<
250 { <<
251 int error = vfs_getattr(path, stat, re <<
252 <<
253 if (request_mask & STATX_MNT_ID_UNIQUE <<
254 stat->mnt_id = real_mount(path <<
255 stat->result_mask |= STATX_MNT <<
256 } else { <<
257 stat->mnt_id = real_mount(path <<
258 stat->result_mask |= STATX_MNT <<
259 } <<
260 <<
261 if (path_mounted(path)) <<
262 stat->attributes |= STATX_ATTR <<
263 stat->attributes_mask |= STATX_ATTR_MO <<
264 <<
265 /* <<
266 * If this is a block device inode, ov <<
267 * attributes with the block device sp <<
268 * obtained from the bdev backing inod <<
269 */ <<
270 if (S_ISBLK(stat->mode)) <<
271 bdev_statx(path, stat, request <<
272 <<
273 return error; <<
274 } <<
275 <<
276 static int vfs_statx_fd(int fd, int flags, str <<
277 u32 request_mask) <<
278 { <<
279 CLASS(fd_raw, f)(fd); <<
280 if (!f.file) <<
281 return -EBADF; <<
282 return vfs_statx_path(&f.file->f_path, <<
283 } <<
284 <<
285 /** 211 /**
286 * vfs_statx - Get basic and extra attributes 212 * vfs_statx - Get basic and extra attributes by filename
287 * @dfd: A file descriptor representing the ba 213 * @dfd: A file descriptor representing the base dir for a relative filename
288 * @filename: The name of the file of interest 214 * @filename: The name of the file of interest
289 * @flags: Flags to control the query 215 * @flags: Flags to control the query
290 * @stat: The result structure to fill in. 216 * @stat: The result structure to fill in.
291 * @request_mask: STATX_xxx flags indicating w 217 * @request_mask: STATX_xxx flags indicating what the caller wants
292 * 218 *
293 * This function is a wrapper around vfs_getat 219 * This function is a wrapper around vfs_getattr(). The main difference is
294 * that it uses a filename and base directory 220 * that it uses a filename and base directory to determine the file location.
295 * Additionally, the use of AT_SYMLINK_NOFOLLO 221 * Additionally, the use of AT_SYMLINK_NOFOLLOW in flags will prevent a symlink
296 * at the given name from being referenced. 222 * at the given name from being referenced.
297 * 223 *
298 * 0 will be returned on success, and a -ve er 224 * 0 will be returned on success, and a -ve error code if unsuccessful.
299 */ 225 */
300 static int vfs_statx(int dfd, struct filename 226 static int vfs_statx(int dfd, struct filename *filename, int flags,
301 struct kstat *stat, u32 request_ 227 struct kstat *stat, u32 request_mask)
302 { 228 {
303 struct path path; 229 struct path path;
304 unsigned int lookup_flags = getname_st 230 unsigned int lookup_flags = getname_statx_lookup_flags(flags);
305 int error; 231 int error;
306 232
307 if (flags & ~(AT_SYMLINK_NOFOLLOW | AT 233 if (flags & ~(AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT | AT_EMPTY_PATH |
308 AT_STATX_SYNC_TYPE)) 234 AT_STATX_SYNC_TYPE))
309 return -EINVAL; 235 return -EINVAL;
310 236
311 retry: 237 retry:
312 error = filename_lookup(dfd, filename, 238 error = filename_lookup(dfd, filename, lookup_flags, &path, NULL);
313 if (error) 239 if (error)
314 return error; !! 240 goto out;
315 error = vfs_statx_path(&path, flags, s !! 241
>> 242 error = vfs_getattr(&path, stat, request_mask, flags);
>> 243
>> 244 stat->mnt_id = real_mount(path.mnt)->mnt_id;
>> 245 stat->result_mask |= STATX_MNT_ID;
>> 246
>> 247 if (path.mnt->mnt_root == path.dentry)
>> 248 stat->attributes |= STATX_ATTR_MOUNT_ROOT;
>> 249 stat->attributes_mask |= STATX_ATTR_MOUNT_ROOT;
>> 250
>> 251 /* Handle STATX_DIOALIGN for block devices. */
>> 252 if (request_mask & STATX_DIOALIGN) {
>> 253 struct inode *inode = d_backing_inode(path.dentry);
>> 254
>> 255 if (S_ISBLK(inode->i_mode))
>> 256 bdev_statx_dioalign(inode, stat);
>> 257 }
>> 258
316 path_put(&path); 259 path_put(&path);
317 if (retry_estale(error, lookup_flags)) 260 if (retry_estale(error, lookup_flags)) {
318 lookup_flags |= LOOKUP_REVAL; 261 lookup_flags |= LOOKUP_REVAL;
319 goto retry; 262 goto retry;
320 } 263 }
>> 264 out:
321 return error; 265 return error;
322 } 266 }
323 267
324 int vfs_fstatat(int dfd, const char __user *fi 268 int vfs_fstatat(int dfd, const char __user *filename,
325 struct kstat *st 269 struct kstat *stat, int flags)
326 { 270 {
327 int ret; 271 int ret;
328 int statx_flags = flags | AT_NO_AUTOMO 272 int statx_flags = flags | AT_NO_AUTOMOUNT;
329 struct filename *name; 273 struct filename *name;
330 274
331 /* !! 275 name = getname_flags(filename, getname_statx_lookup_flags(statx_flags), NULL);
332 * Work around glibc turning fstat() i <<
333 * <<
334 * If AT_EMPTY_PATH is set, we expect <<
335 * empty path, and avoid doing all the <<
336 */ <<
337 if (flags == AT_EMPTY_PATH && vfs_empt <<
338 return vfs_fstat(dfd, stat); <<
339 <<
340 name = getname_flags(filename, getname <<
341 ret = vfs_statx(dfd, name, statx_flags 276 ret = vfs_statx(dfd, name, statx_flags, stat, STATX_BASIC_STATS);
342 putname(name); 277 putname(name);
343 278
344 return ret; 279 return ret;
345 } 280 }
346 281
347 #ifdef __ARCH_WANT_OLD_STAT 282 #ifdef __ARCH_WANT_OLD_STAT
348 283
349 /* 284 /*
350 * For backward compatibility? Maybe this sho 285 * For backward compatibility? Maybe this should be moved
351 * into arch/i386 instead? 286 * into arch/i386 instead?
352 */ 287 */
353 static int cp_old_stat(struct kstat *stat, str 288 static int cp_old_stat(struct kstat *stat, struct __old_kernel_stat __user * statbuf)
354 { 289 {
355 static int warncount = 5; 290 static int warncount = 5;
356 struct __old_kernel_stat tmp; 291 struct __old_kernel_stat tmp;
357 292
358 if (warncount > 0) { 293 if (warncount > 0) {
359 warncount--; 294 warncount--;
360 printk(KERN_WARNING "VFS: Warn 295 printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n",
361 current->comm); 296 current->comm);
362 } else if (warncount < 0) { 297 } else if (warncount < 0) {
363 /* it's laughable, but... */ 298 /* it's laughable, but... */
364 warncount = 0; 299 warncount = 0;
365 } 300 }
366 301
367 memset(&tmp, 0, sizeof(struct __old_ke 302 memset(&tmp, 0, sizeof(struct __old_kernel_stat));
368 tmp.st_dev = old_encode_dev(stat->dev) 303 tmp.st_dev = old_encode_dev(stat->dev);
369 tmp.st_ino = stat->ino; 304 tmp.st_ino = stat->ino;
370 if (sizeof(tmp.st_ino) < sizeof(stat-> 305 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
371 return -EOVERFLOW; 306 return -EOVERFLOW;
372 tmp.st_mode = stat->mode; 307 tmp.st_mode = stat->mode;
373 tmp.st_nlink = stat->nlink; 308 tmp.st_nlink = stat->nlink;
374 if (tmp.st_nlink != stat->nlink) 309 if (tmp.st_nlink != stat->nlink)
375 return -EOVERFLOW; 310 return -EOVERFLOW;
376 SET_UID(tmp.st_uid, from_kuid_munged(c 311 SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
377 SET_GID(tmp.st_gid, from_kgid_munged(c 312 SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
378 tmp.st_rdev = old_encode_dev(stat->rde 313 tmp.st_rdev = old_encode_dev(stat->rdev);
379 #if BITS_PER_LONG == 32 314 #if BITS_PER_LONG == 32
380 if (stat->size > MAX_NON_LFS) 315 if (stat->size > MAX_NON_LFS)
381 return -EOVERFLOW; 316 return -EOVERFLOW;
382 #endif 317 #endif
383 tmp.st_size = stat->size; 318 tmp.st_size = stat->size;
384 tmp.st_atime = stat->atime.tv_sec; 319 tmp.st_atime = stat->atime.tv_sec;
385 tmp.st_mtime = stat->mtime.tv_sec; 320 tmp.st_mtime = stat->mtime.tv_sec;
386 tmp.st_ctime = stat->ctime.tv_sec; 321 tmp.st_ctime = stat->ctime.tv_sec;
387 return copy_to_user(statbuf,&tmp,sizeo 322 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
388 } 323 }
389 324
390 SYSCALL_DEFINE2(stat, const char __user *, fil 325 SYSCALL_DEFINE2(stat, const char __user *, filename,
391 struct __old_kernel_stat __use 326 struct __old_kernel_stat __user *, statbuf)
392 { 327 {
393 struct kstat stat; 328 struct kstat stat;
394 int error; 329 int error;
395 330
396 error = vfs_stat(filename, &stat); 331 error = vfs_stat(filename, &stat);
397 if (error) 332 if (error)
398 return error; 333 return error;
399 334
400 return cp_old_stat(&stat, statbuf); 335 return cp_old_stat(&stat, statbuf);
401 } 336 }
402 337
403 SYSCALL_DEFINE2(lstat, const char __user *, fi 338 SYSCALL_DEFINE2(lstat, const char __user *, filename,
404 struct __old_kernel_stat __use 339 struct __old_kernel_stat __user *, statbuf)
405 { 340 {
406 struct kstat stat; 341 struct kstat stat;
407 int error; 342 int error;
408 343
409 error = vfs_lstat(filename, &stat); 344 error = vfs_lstat(filename, &stat);
410 if (error) 345 if (error)
411 return error; 346 return error;
412 347
413 return cp_old_stat(&stat, statbuf); 348 return cp_old_stat(&stat, statbuf);
414 } 349 }
415 350
416 SYSCALL_DEFINE2(fstat, unsigned int, fd, struc 351 SYSCALL_DEFINE2(fstat, unsigned int, fd, struct __old_kernel_stat __user *, statbuf)
417 { 352 {
418 struct kstat stat; 353 struct kstat stat;
419 int error = vfs_fstat(fd, &stat); 354 int error = vfs_fstat(fd, &stat);
420 355
421 if (!error) 356 if (!error)
422 error = cp_old_stat(&stat, sta 357 error = cp_old_stat(&stat, statbuf);
423 358
424 return error; 359 return error;
425 } 360 }
426 361
427 #endif /* __ARCH_WANT_OLD_STAT */ 362 #endif /* __ARCH_WANT_OLD_STAT */
428 363
429 #ifdef __ARCH_WANT_NEW_STAT 364 #ifdef __ARCH_WANT_NEW_STAT
430 365
>> 366 #if BITS_PER_LONG == 32
>> 367 # define choose_32_64(a,b) a
>> 368 #else
>> 369 # define choose_32_64(a,b) b
>> 370 #endif
>> 371
431 #ifndef INIT_STRUCT_STAT_PADDING 372 #ifndef INIT_STRUCT_STAT_PADDING
432 # define INIT_STRUCT_STAT_PADDING(st) memset( 373 # define INIT_STRUCT_STAT_PADDING(st) memset(&st, 0, sizeof(st))
433 #endif 374 #endif
434 375
435 static int cp_new_stat(struct kstat *stat, str 376 static int cp_new_stat(struct kstat *stat, struct stat __user *statbuf)
436 { 377 {
437 struct stat tmp; 378 struct stat tmp;
438 379
439 if (sizeof(tmp.st_dev) < 4 && !old_val 380 if (sizeof(tmp.st_dev) < 4 && !old_valid_dev(stat->dev))
440 return -EOVERFLOW; 381 return -EOVERFLOW;
441 if (sizeof(tmp.st_rdev) < 4 && !old_va 382 if (sizeof(tmp.st_rdev) < 4 && !old_valid_dev(stat->rdev))
442 return -EOVERFLOW; 383 return -EOVERFLOW;
443 #if BITS_PER_LONG == 32 384 #if BITS_PER_LONG == 32
444 if (stat->size > MAX_NON_LFS) 385 if (stat->size > MAX_NON_LFS)
445 return -EOVERFLOW; 386 return -EOVERFLOW;
446 #endif 387 #endif
447 388
448 INIT_STRUCT_STAT_PADDING(tmp); 389 INIT_STRUCT_STAT_PADDING(tmp);
449 tmp.st_dev = new_encode_dev(stat->dev) 390 tmp.st_dev = new_encode_dev(stat->dev);
450 tmp.st_ino = stat->ino; 391 tmp.st_ino = stat->ino;
451 if (sizeof(tmp.st_ino) < sizeof(stat-> 392 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
452 return -EOVERFLOW; 393 return -EOVERFLOW;
453 tmp.st_mode = stat->mode; 394 tmp.st_mode = stat->mode;
454 tmp.st_nlink = stat->nlink; 395 tmp.st_nlink = stat->nlink;
455 if (tmp.st_nlink != stat->nlink) 396 if (tmp.st_nlink != stat->nlink)
456 return -EOVERFLOW; 397 return -EOVERFLOW;
457 SET_UID(tmp.st_uid, from_kuid_munged(c 398 SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
458 SET_GID(tmp.st_gid, from_kgid_munged(c 399 SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
459 tmp.st_rdev = new_encode_dev(stat->rde 400 tmp.st_rdev = new_encode_dev(stat->rdev);
460 tmp.st_size = stat->size; 401 tmp.st_size = stat->size;
461 tmp.st_atime = stat->atime.tv_sec; 402 tmp.st_atime = stat->atime.tv_sec;
462 tmp.st_mtime = stat->mtime.tv_sec; 403 tmp.st_mtime = stat->mtime.tv_sec;
463 tmp.st_ctime = stat->ctime.tv_sec; 404 tmp.st_ctime = stat->ctime.tv_sec;
464 #ifdef STAT_HAVE_NSEC 405 #ifdef STAT_HAVE_NSEC
465 tmp.st_atime_nsec = stat->atime.tv_nse 406 tmp.st_atime_nsec = stat->atime.tv_nsec;
466 tmp.st_mtime_nsec = stat->mtime.tv_nse 407 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
467 tmp.st_ctime_nsec = stat->ctime.tv_nse 408 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
468 #endif 409 #endif
469 tmp.st_blocks = stat->blocks; 410 tmp.st_blocks = stat->blocks;
470 tmp.st_blksize = stat->blksize; 411 tmp.st_blksize = stat->blksize;
471 return copy_to_user(statbuf,&tmp,sizeo 412 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
472 } 413 }
473 414
474 SYSCALL_DEFINE2(newstat, const char __user *, 415 SYSCALL_DEFINE2(newstat, const char __user *, filename,
475 struct stat __user *, statbuf) 416 struct stat __user *, statbuf)
476 { 417 {
477 struct kstat stat; 418 struct kstat stat;
478 int error = vfs_stat(filename, &stat); 419 int error = vfs_stat(filename, &stat);
479 420
480 if (error) 421 if (error)
481 return error; 422 return error;
482 return cp_new_stat(&stat, statbuf); 423 return cp_new_stat(&stat, statbuf);
483 } 424 }
484 425
485 SYSCALL_DEFINE2(newlstat, const char __user *, 426 SYSCALL_DEFINE2(newlstat, const char __user *, filename,
486 struct stat __user *, statbuf) 427 struct stat __user *, statbuf)
487 { 428 {
488 struct kstat stat; 429 struct kstat stat;
489 int error; 430 int error;
490 431
491 error = vfs_lstat(filename, &stat); 432 error = vfs_lstat(filename, &stat);
492 if (error) 433 if (error)
493 return error; 434 return error;
494 435
495 return cp_new_stat(&stat, statbuf); 436 return cp_new_stat(&stat, statbuf);
496 } 437 }
497 438
498 #if !defined(__ARCH_WANT_STAT64) || defined(__ 439 #if !defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_SYS_NEWFSTATAT)
499 SYSCALL_DEFINE4(newfstatat, int, dfd, const ch 440 SYSCALL_DEFINE4(newfstatat, int, dfd, const char __user *, filename,
500 struct stat __user *, statbuf, 441 struct stat __user *, statbuf, int, flag)
501 { 442 {
502 struct kstat stat; 443 struct kstat stat;
503 int error; 444 int error;
504 445
505 error = vfs_fstatat(dfd, filename, &st 446 error = vfs_fstatat(dfd, filename, &stat, flag);
506 if (error) 447 if (error)
507 return error; 448 return error;
508 return cp_new_stat(&stat, statbuf); 449 return cp_new_stat(&stat, statbuf);
509 } 450 }
510 #endif 451 #endif
511 452
512 SYSCALL_DEFINE2(newfstat, unsigned int, fd, st 453 SYSCALL_DEFINE2(newfstat, unsigned int, fd, struct stat __user *, statbuf)
513 { 454 {
514 struct kstat stat; 455 struct kstat stat;
515 int error = vfs_fstat(fd, &stat); 456 int error = vfs_fstat(fd, &stat);
516 457
517 if (!error) 458 if (!error)
518 error = cp_new_stat(&stat, sta 459 error = cp_new_stat(&stat, statbuf);
519 460
520 return error; 461 return error;
521 } 462 }
522 #endif 463 #endif
523 464
524 static int do_readlinkat(int dfd, const char _ 465 static int do_readlinkat(int dfd, const char __user *pathname,
525 char __user *buf, int 466 char __user *buf, int bufsiz)
526 { 467 {
527 struct path path; 468 struct path path;
528 struct filename *name; <<
529 int error; 469 int error;
>> 470 int empty = 0;
530 unsigned int lookup_flags = LOOKUP_EMP 471 unsigned int lookup_flags = LOOKUP_EMPTY;
531 472
532 if (bufsiz <= 0) 473 if (bufsiz <= 0)
533 return -EINVAL; 474 return -EINVAL;
534 475
535 retry: 476 retry:
536 name = getname_flags(pathname, lookup_ !! 477 error = user_path_at_empty(dfd, pathname, lookup_flags, &path, &empty);
537 error = filename_lookup(dfd, name, loo !! 478 if (!error) {
538 if (unlikely(error)) { !! 479 struct inode *inode = d_backing_inode(path.dentry);
539 putname(name); !! 480
540 return error; !! 481 error = empty ? -ENOENT : -EINVAL;
541 } !! 482 /*
542 !! 483 * AFS mountpoints allow readlink(2) but are not symlinks
543 /* !! 484 */
544 * AFS mountpoints allow readlink(2) b !! 485 if (d_is_symlink(path.dentry) || inode->i_op->readlink) {
545 */ !! 486 error = security_inode_readlink(path.dentry);
546 if (d_is_symlink(path.dentry) || !! 487 if (!error) {
547 d_backing_inode(path.dentry)->i_op !! 488 touch_atime(&path);
548 error = security_inode_readlin !! 489 error = vfs_readlink(path.dentry, buf, bufsiz);
549 if (!error) { !! 490 }
550 touch_atime(&path); !! 491 }
551 error = vfs_readlink(p !! 492 path_put(&path);
>> 493 if (retry_estale(error, lookup_flags)) {
>> 494 lookup_flags |= LOOKUP_REVAL;
>> 495 goto retry;
552 } 496 }
553 } else { <<
554 error = (name->name[0] == '\0' <<
555 } <<
556 path_put(&path); <<
557 putname(name); <<
558 if (retry_estale(error, lookup_flags)) <<
559 lookup_flags |= LOOKUP_REVAL; <<
560 goto retry; <<
561 } 497 }
562 return error; 498 return error;
563 } 499 }
564 500
565 SYSCALL_DEFINE4(readlinkat, int, dfd, const ch 501 SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname,
566 char __user *, buf, int, bufsi 502 char __user *, buf, int, bufsiz)
567 { 503 {
568 return do_readlinkat(dfd, pathname, bu 504 return do_readlinkat(dfd, pathname, buf, bufsiz);
569 } 505 }
570 506
571 SYSCALL_DEFINE3(readlink, const char __user *, 507 SYSCALL_DEFINE3(readlink, const char __user *, path, char __user *, buf,
572 int, bufsiz) 508 int, bufsiz)
573 { 509 {
574 return do_readlinkat(AT_FDCWD, path, b 510 return do_readlinkat(AT_FDCWD, path, buf, bufsiz);
575 } 511 }
576 512
577 513
578 /* ---------- LFS-64 ----------- */ 514 /* ---------- LFS-64 ----------- */
579 #if defined(__ARCH_WANT_STAT64) || defined(__A 515 #if defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_COMPAT_STAT64)
580 516
581 #ifndef INIT_STRUCT_STAT64_PADDING 517 #ifndef INIT_STRUCT_STAT64_PADDING
582 # define INIT_STRUCT_STAT64_PADDING(st) memse 518 # define INIT_STRUCT_STAT64_PADDING(st) memset(&st, 0, sizeof(st))
583 #endif 519 #endif
584 520
585 static long cp_new_stat64(struct kstat *stat, 521 static long cp_new_stat64(struct kstat *stat, struct stat64 __user *statbuf)
586 { 522 {
587 struct stat64 tmp; 523 struct stat64 tmp;
588 524
589 INIT_STRUCT_STAT64_PADDING(tmp); 525 INIT_STRUCT_STAT64_PADDING(tmp);
590 #ifdef CONFIG_MIPS 526 #ifdef CONFIG_MIPS
591 /* mips has weird padding, so we don't 527 /* mips has weird padding, so we don't get 64 bits there */
592 tmp.st_dev = new_encode_dev(stat->dev) 528 tmp.st_dev = new_encode_dev(stat->dev);
593 tmp.st_rdev = new_encode_dev(stat->rde 529 tmp.st_rdev = new_encode_dev(stat->rdev);
594 #else 530 #else
595 tmp.st_dev = huge_encode_dev(stat->dev 531 tmp.st_dev = huge_encode_dev(stat->dev);
596 tmp.st_rdev = huge_encode_dev(stat->rd 532 tmp.st_rdev = huge_encode_dev(stat->rdev);
597 #endif 533 #endif
598 tmp.st_ino = stat->ino; 534 tmp.st_ino = stat->ino;
599 if (sizeof(tmp.st_ino) < sizeof(stat-> 535 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
600 return -EOVERFLOW; 536 return -EOVERFLOW;
601 #ifdef STAT64_HAS_BROKEN_ST_INO 537 #ifdef STAT64_HAS_BROKEN_ST_INO
602 tmp.__st_ino = stat->ino; 538 tmp.__st_ino = stat->ino;
603 #endif 539 #endif
604 tmp.st_mode = stat->mode; 540 tmp.st_mode = stat->mode;
605 tmp.st_nlink = stat->nlink; 541 tmp.st_nlink = stat->nlink;
606 tmp.st_uid = from_kuid_munged(current_ 542 tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
607 tmp.st_gid = from_kgid_munged(current_ 543 tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
608 tmp.st_atime = stat->atime.tv_sec; 544 tmp.st_atime = stat->atime.tv_sec;
609 tmp.st_atime_nsec = stat->atime.tv_nse 545 tmp.st_atime_nsec = stat->atime.tv_nsec;
610 tmp.st_mtime = stat->mtime.tv_sec; 546 tmp.st_mtime = stat->mtime.tv_sec;
611 tmp.st_mtime_nsec = stat->mtime.tv_nse 547 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
612 tmp.st_ctime = stat->ctime.tv_sec; 548 tmp.st_ctime = stat->ctime.tv_sec;
613 tmp.st_ctime_nsec = stat->ctime.tv_nse 549 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
614 tmp.st_size = stat->size; 550 tmp.st_size = stat->size;
615 tmp.st_blocks = stat->blocks; 551 tmp.st_blocks = stat->blocks;
616 tmp.st_blksize = stat->blksize; 552 tmp.st_blksize = stat->blksize;
617 return copy_to_user(statbuf,&tmp,sizeo 553 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
618 } 554 }
619 555
620 SYSCALL_DEFINE2(stat64, const char __user *, f 556 SYSCALL_DEFINE2(stat64, const char __user *, filename,
621 struct stat64 __user *, statbu 557 struct stat64 __user *, statbuf)
622 { 558 {
623 struct kstat stat; 559 struct kstat stat;
624 int error = vfs_stat(filename, &stat); 560 int error = vfs_stat(filename, &stat);
625 561
626 if (!error) 562 if (!error)
627 error = cp_new_stat64(&stat, s 563 error = cp_new_stat64(&stat, statbuf);
628 564
629 return error; 565 return error;
630 } 566 }
631 567
632 SYSCALL_DEFINE2(lstat64, const char __user *, 568 SYSCALL_DEFINE2(lstat64, const char __user *, filename,
633 struct stat64 __user *, statbu 569 struct stat64 __user *, statbuf)
634 { 570 {
635 struct kstat stat; 571 struct kstat stat;
636 int error = vfs_lstat(filename, &stat) 572 int error = vfs_lstat(filename, &stat);
637 573
638 if (!error) 574 if (!error)
639 error = cp_new_stat64(&stat, s 575 error = cp_new_stat64(&stat, statbuf);
640 576
641 return error; 577 return error;
642 } 578 }
643 579
644 SYSCALL_DEFINE2(fstat64, unsigned long, fd, st 580 SYSCALL_DEFINE2(fstat64, unsigned long, fd, struct stat64 __user *, statbuf)
645 { 581 {
646 struct kstat stat; 582 struct kstat stat;
647 int error = vfs_fstat(fd, &stat); 583 int error = vfs_fstat(fd, &stat);
648 584
649 if (!error) 585 if (!error)
650 error = cp_new_stat64(&stat, s 586 error = cp_new_stat64(&stat, statbuf);
651 587
652 return error; 588 return error;
653 } 589 }
654 590
655 SYSCALL_DEFINE4(fstatat64, int, dfd, const cha 591 SYSCALL_DEFINE4(fstatat64, int, dfd, const char __user *, filename,
656 struct stat64 __user *, statbu 592 struct stat64 __user *, statbuf, int, flag)
657 { 593 {
658 struct kstat stat; 594 struct kstat stat;
659 int error; 595 int error;
660 596
661 error = vfs_fstatat(dfd, filename, &st 597 error = vfs_fstatat(dfd, filename, &stat, flag);
662 if (error) 598 if (error)
663 return error; 599 return error;
664 return cp_new_stat64(&stat, statbuf); 600 return cp_new_stat64(&stat, statbuf);
665 } 601 }
666 #endif /* __ARCH_WANT_STAT64 || __ARCH_WANT_CO 602 #endif /* __ARCH_WANT_STAT64 || __ARCH_WANT_COMPAT_STAT64 */
667 603
668 static noinline_for_stack int 604 static noinline_for_stack int
669 cp_statx(const struct kstat *stat, struct stat 605 cp_statx(const struct kstat *stat, struct statx __user *buffer)
670 { 606 {
671 struct statx tmp; 607 struct statx tmp;
672 608
673 memset(&tmp, 0, sizeof(tmp)); 609 memset(&tmp, 0, sizeof(tmp));
674 610
675 /* STATX_CHANGE_COOKIE is kernel-only 611 /* STATX_CHANGE_COOKIE is kernel-only for now */
676 tmp.stx_mask = stat->result_mask & ~ST 612 tmp.stx_mask = stat->result_mask & ~STATX_CHANGE_COOKIE;
677 tmp.stx_blksize = stat->blksize; 613 tmp.stx_blksize = stat->blksize;
678 /* STATX_ATTR_CHANGE_MONOTONIC is kern 614 /* STATX_ATTR_CHANGE_MONOTONIC is kernel-only for now */
679 tmp.stx_attributes = stat->attributes 615 tmp.stx_attributes = stat->attributes & ~STATX_ATTR_CHANGE_MONOTONIC;
680 tmp.stx_nlink = stat->nlink; 616 tmp.stx_nlink = stat->nlink;
681 tmp.stx_uid = from_kuid_munged(current 617 tmp.stx_uid = from_kuid_munged(current_user_ns(), stat->uid);
682 tmp.stx_gid = from_kgid_munged(current 618 tmp.stx_gid = from_kgid_munged(current_user_ns(), stat->gid);
683 tmp.stx_mode = stat->mode; 619 tmp.stx_mode = stat->mode;
684 tmp.stx_ino = stat->ino; 620 tmp.stx_ino = stat->ino;
685 tmp.stx_size = stat->size; 621 tmp.stx_size = stat->size;
686 tmp.stx_blocks = stat->blocks; 622 tmp.stx_blocks = stat->blocks;
687 tmp.stx_attributes_mask = stat->attrib 623 tmp.stx_attributes_mask = stat->attributes_mask;
688 tmp.stx_atime.tv_sec = stat->atime.tv_ 624 tmp.stx_atime.tv_sec = stat->atime.tv_sec;
689 tmp.stx_atime.tv_nsec = stat->atime.tv 625 tmp.stx_atime.tv_nsec = stat->atime.tv_nsec;
690 tmp.stx_btime.tv_sec = stat->btime.tv_ 626 tmp.stx_btime.tv_sec = stat->btime.tv_sec;
691 tmp.stx_btime.tv_nsec = stat->btime.tv 627 tmp.stx_btime.tv_nsec = stat->btime.tv_nsec;
692 tmp.stx_ctime.tv_sec = stat->ctime.tv_ 628 tmp.stx_ctime.tv_sec = stat->ctime.tv_sec;
693 tmp.stx_ctime.tv_nsec = stat->ctime.tv 629 tmp.stx_ctime.tv_nsec = stat->ctime.tv_nsec;
694 tmp.stx_mtime.tv_sec = stat->mtime.tv_ 630 tmp.stx_mtime.tv_sec = stat->mtime.tv_sec;
695 tmp.stx_mtime.tv_nsec = stat->mtime.tv 631 tmp.stx_mtime.tv_nsec = stat->mtime.tv_nsec;
696 tmp.stx_rdev_major = MAJOR(stat->rdev) 632 tmp.stx_rdev_major = MAJOR(stat->rdev);
697 tmp.stx_rdev_minor = MINOR(stat->rdev) 633 tmp.stx_rdev_minor = MINOR(stat->rdev);
698 tmp.stx_dev_major = MAJOR(stat->dev); 634 tmp.stx_dev_major = MAJOR(stat->dev);
699 tmp.stx_dev_minor = MINOR(stat->dev); 635 tmp.stx_dev_minor = MINOR(stat->dev);
700 tmp.stx_mnt_id = stat->mnt_id; 636 tmp.stx_mnt_id = stat->mnt_id;
701 tmp.stx_dio_mem_align = stat->dio_mem_ 637 tmp.stx_dio_mem_align = stat->dio_mem_align;
702 tmp.stx_dio_offset_align = stat->dio_o 638 tmp.stx_dio_offset_align = stat->dio_offset_align;
703 tmp.stx_subvol = stat->subvol; <<
704 tmp.stx_atomic_write_unit_min = stat-> <<
705 tmp.stx_atomic_write_unit_max = stat-> <<
706 tmp.stx_atomic_write_segments_max = st <<
707 639
708 return copy_to_user(buffer, &tmp, size 640 return copy_to_user(buffer, &tmp, sizeof(tmp)) ? -EFAULT : 0;
709 } 641 }
710 642
711 int do_statx(int dfd, struct filename *filenam 643 int do_statx(int dfd, struct filename *filename, unsigned int flags,
712 unsigned int mask, struct statx _ 644 unsigned int mask, struct statx __user *buffer)
713 { 645 {
714 struct kstat stat; 646 struct kstat stat;
715 int error; 647 int error;
716 648
717 if (mask & STATX__RESERVED) 649 if (mask & STATX__RESERVED)
718 return -EINVAL; 650 return -EINVAL;
719 if ((flags & AT_STATX_SYNC_TYPE) == AT 651 if ((flags & AT_STATX_SYNC_TYPE) == AT_STATX_SYNC_TYPE)
720 return -EINVAL; 652 return -EINVAL;
721 653
722 /* !! 654 /* STATX_CHANGE_COOKIE is kernel-only for now. Ignore requests
723 * STATX_CHANGE_COOKIE is kernel-only <<
724 * from userland. 655 * from userland.
725 */ 656 */
726 mask &= ~STATX_CHANGE_COOKIE; 657 mask &= ~STATX_CHANGE_COOKIE;
727 658
728 error = vfs_statx(dfd, filename, flags 659 error = vfs_statx(dfd, filename, flags, &stat, mask);
729 if (error) 660 if (error)
730 return error; 661 return error;
731 662
732 return cp_statx(&stat, buffer); 663 return cp_statx(&stat, buffer);
733 } 664 }
734 665
735 int do_statx_fd(int fd, unsigned int flags, un <<
736 struct statx __user *buffer) <<
737 { <<
738 struct kstat stat; <<
739 int error; <<
740 <<
741 if (mask & STATX__RESERVED) <<
742 return -EINVAL; <<
743 if ((flags & AT_STATX_SYNC_TYPE) == AT <<
744 return -EINVAL; <<
745 <<
746 /* <<
747 * STATX_CHANGE_COOKIE is kernel-only <<
748 * from userland. <<
749 */ <<
750 mask &= ~STATX_CHANGE_COOKIE; <<
751 <<
752 error = vfs_statx_fd(fd, flags, &stat, <<
753 if (error) <<
754 return error; <<
755 <<
756 return cp_statx(&stat, buffer); <<
757 } <<
758 <<
759 /** 666 /**
760 * sys_statx - System call to get enhanced sta 667 * sys_statx - System call to get enhanced stats
761 * @dfd: Base directory to pathwalk from *or* 668 * @dfd: Base directory to pathwalk from *or* fd to stat.
762 * @filename: File to stat or either NULL or " !! 669 * @filename: File to stat or "" with AT_EMPTY_PATH
763 * @flags: AT_* flags to control pathwalk. 670 * @flags: AT_* flags to control pathwalk.
764 * @mask: Parts of statx struct actually requi 671 * @mask: Parts of statx struct actually required.
765 * @buffer: Result buffer. 672 * @buffer: Result buffer.
766 * 673 *
767 * Note that fstat() can be emulated by settin 674 * Note that fstat() can be emulated by setting dfd to the fd of interest,
768 * supplying "" (or preferably NULL) as the fi !! 675 * supplying "" as the filename and setting AT_EMPTY_PATH in the flags.
769 * in the flags. <<
770 */ 676 */
771 SYSCALL_DEFINE5(statx, 677 SYSCALL_DEFINE5(statx,
772 int, dfd, const char __user *, 678 int, dfd, const char __user *, filename, unsigned, flags,
773 unsigned int, mask, 679 unsigned int, mask,
774 struct statx __user *, buffer) 680 struct statx __user *, buffer)
775 { 681 {
776 int ret; 682 int ret;
777 unsigned lflags; <<
778 struct filename *name; 683 struct filename *name;
779 684
780 /* !! 685 name = getname_flags(filename, getname_statx_lookup_flags(flags), NULL);
781 * Short-circuit handling of NULL and <<
782 * <<
783 * For a NULL path we require and acce <<
784 * (possibly |'d with AT_STATX flags). <<
785 * <<
786 * However, glibc on 32-bit architectu <<
787 * with the "" pathname and AT_NO_AUTO <<
788 * Supporting this results in the ugli <<
789 */ <<
790 lflags = flags & ~(AT_NO_AUTOMOUNT | A <<
791 if (lflags == AT_EMPTY_PATH && vfs_emp <<
792 return do_statx_fd(dfd, flags <<
793 <<
794 name = getname_flags(filename, getname <<
795 ret = do_statx(dfd, name, flags, mask, 686 ret = do_statx(dfd, name, flags, mask, buffer);
796 putname(name); 687 putname(name);
797 688
798 return ret; 689 return ret;
799 } 690 }
800 691
801 #if defined(CONFIG_COMPAT) && defined(__ARCH_W 692 #if defined(CONFIG_COMPAT) && defined(__ARCH_WANT_COMPAT_STAT)
802 static int cp_compat_stat(struct kstat *stat, 693 static int cp_compat_stat(struct kstat *stat, struct compat_stat __user *ubuf)
803 { 694 {
804 struct compat_stat tmp; 695 struct compat_stat tmp;
805 696
806 if (sizeof(tmp.st_dev) < 4 && !old_val 697 if (sizeof(tmp.st_dev) < 4 && !old_valid_dev(stat->dev))
807 return -EOVERFLOW; 698 return -EOVERFLOW;
808 if (sizeof(tmp.st_rdev) < 4 && !old_va 699 if (sizeof(tmp.st_rdev) < 4 && !old_valid_dev(stat->rdev))
809 return -EOVERFLOW; 700 return -EOVERFLOW;
810 701
811 memset(&tmp, 0, sizeof(tmp)); 702 memset(&tmp, 0, sizeof(tmp));
812 tmp.st_dev = new_encode_dev(stat->dev) 703 tmp.st_dev = new_encode_dev(stat->dev);
813 tmp.st_ino = stat->ino; 704 tmp.st_ino = stat->ino;
814 if (sizeof(tmp.st_ino) < sizeof(stat-> 705 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
815 return -EOVERFLOW; 706 return -EOVERFLOW;
816 tmp.st_mode = stat->mode; 707 tmp.st_mode = stat->mode;
817 tmp.st_nlink = stat->nlink; 708 tmp.st_nlink = stat->nlink;
818 if (tmp.st_nlink != stat->nlink) 709 if (tmp.st_nlink != stat->nlink)
819 return -EOVERFLOW; 710 return -EOVERFLOW;
820 SET_UID(tmp.st_uid, from_kuid_munged(c 711 SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
821 SET_GID(tmp.st_gid, from_kgid_munged(c 712 SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
822 tmp.st_rdev = new_encode_dev(stat->rde 713 tmp.st_rdev = new_encode_dev(stat->rdev);
823 if ((u64) stat->size > MAX_NON_LFS) 714 if ((u64) stat->size > MAX_NON_LFS)
824 return -EOVERFLOW; 715 return -EOVERFLOW;
825 tmp.st_size = stat->size; 716 tmp.st_size = stat->size;
826 tmp.st_atime = stat->atime.tv_sec; 717 tmp.st_atime = stat->atime.tv_sec;
827 tmp.st_atime_nsec = stat->atime.tv_nse 718 tmp.st_atime_nsec = stat->atime.tv_nsec;
828 tmp.st_mtime = stat->mtime.tv_sec; 719 tmp.st_mtime = stat->mtime.tv_sec;
829 tmp.st_mtime_nsec = stat->mtime.tv_nse 720 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
830 tmp.st_ctime = stat->ctime.tv_sec; 721 tmp.st_ctime = stat->ctime.tv_sec;
831 tmp.st_ctime_nsec = stat->ctime.tv_nse 722 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
832 tmp.st_blocks = stat->blocks; 723 tmp.st_blocks = stat->blocks;
833 tmp.st_blksize = stat->blksize; 724 tmp.st_blksize = stat->blksize;
834 return copy_to_user(ubuf, &tmp, sizeof 725 return copy_to_user(ubuf, &tmp, sizeof(tmp)) ? -EFAULT : 0;
835 } 726 }
836 727
837 COMPAT_SYSCALL_DEFINE2(newstat, const char __u 728 COMPAT_SYSCALL_DEFINE2(newstat, const char __user *, filename,
838 struct compat_stat __us 729 struct compat_stat __user *, statbuf)
839 { 730 {
840 struct kstat stat; 731 struct kstat stat;
841 int error; 732 int error;
842 733
843 error = vfs_stat(filename, &stat); 734 error = vfs_stat(filename, &stat);
844 if (error) 735 if (error)
845 return error; 736 return error;
846 return cp_compat_stat(&stat, statbuf); 737 return cp_compat_stat(&stat, statbuf);
847 } 738 }
848 739
849 COMPAT_SYSCALL_DEFINE2(newlstat, const char __ 740 COMPAT_SYSCALL_DEFINE2(newlstat, const char __user *, filename,
850 struct compat_stat __us 741 struct compat_stat __user *, statbuf)
851 { 742 {
852 struct kstat stat; 743 struct kstat stat;
853 int error; 744 int error;
854 745
855 error = vfs_lstat(filename, &stat); 746 error = vfs_lstat(filename, &stat);
856 if (error) 747 if (error)
857 return error; 748 return error;
858 return cp_compat_stat(&stat, statbuf); 749 return cp_compat_stat(&stat, statbuf);
859 } 750 }
860 751
861 #ifndef __ARCH_WANT_STAT64 752 #ifndef __ARCH_WANT_STAT64
862 COMPAT_SYSCALL_DEFINE4(newfstatat, unsigned in 753 COMPAT_SYSCALL_DEFINE4(newfstatat, unsigned int, dfd,
863 const char __user *, fi 754 const char __user *, filename,
864 struct compat_stat __us 755 struct compat_stat __user *, statbuf, int, flag)
865 { 756 {
866 struct kstat stat; 757 struct kstat stat;
867 int error; 758 int error;
868 759
869 error = vfs_fstatat(dfd, filename, &st 760 error = vfs_fstatat(dfd, filename, &stat, flag);
870 if (error) 761 if (error)
871 return error; 762 return error;
872 return cp_compat_stat(&stat, statbuf); 763 return cp_compat_stat(&stat, statbuf);
873 } 764 }
874 #endif 765 #endif
875 766
876 COMPAT_SYSCALL_DEFINE2(newfstat, unsigned int, 767 COMPAT_SYSCALL_DEFINE2(newfstat, unsigned int, fd,
877 struct compat_stat __us 768 struct compat_stat __user *, statbuf)
878 { 769 {
879 struct kstat stat; 770 struct kstat stat;
880 int error = vfs_fstat(fd, &stat); 771 int error = vfs_fstat(fd, &stat);
881 772
882 if (!error) 773 if (!error)
883 error = cp_compat_stat(&stat, 774 error = cp_compat_stat(&stat, statbuf);
884 return error; 775 return error;
885 } 776 }
886 #endif 777 #endif
887 778
888 /* Caller is here responsible for sufficient l 779 /* Caller is here responsible for sufficient locking (ie. inode->i_lock) */
889 void __inode_add_bytes(struct inode *inode, lo 780 void __inode_add_bytes(struct inode *inode, loff_t bytes)
890 { 781 {
891 inode->i_blocks += bytes >> 9; 782 inode->i_blocks += bytes >> 9;
892 bytes &= 511; 783 bytes &= 511;
893 inode->i_bytes += bytes; 784 inode->i_bytes += bytes;
894 if (inode->i_bytes >= 512) { 785 if (inode->i_bytes >= 512) {
895 inode->i_blocks++; 786 inode->i_blocks++;
896 inode->i_bytes -= 512; 787 inode->i_bytes -= 512;
897 } 788 }
898 } 789 }
899 EXPORT_SYMBOL(__inode_add_bytes); 790 EXPORT_SYMBOL(__inode_add_bytes);
900 791
901 void inode_add_bytes(struct inode *inode, loff 792 void inode_add_bytes(struct inode *inode, loff_t bytes)
902 { 793 {
903 spin_lock(&inode->i_lock); 794 spin_lock(&inode->i_lock);
904 __inode_add_bytes(inode, bytes); 795 __inode_add_bytes(inode, bytes);
905 spin_unlock(&inode->i_lock); 796 spin_unlock(&inode->i_lock);
906 } 797 }
907 798
908 EXPORT_SYMBOL(inode_add_bytes); 799 EXPORT_SYMBOL(inode_add_bytes);
909 800
910 void __inode_sub_bytes(struct inode *inode, lo 801 void __inode_sub_bytes(struct inode *inode, loff_t bytes)
911 { 802 {
912 inode->i_blocks -= bytes >> 9; 803 inode->i_blocks -= bytes >> 9;
913 bytes &= 511; 804 bytes &= 511;
914 if (inode->i_bytes < bytes) { 805 if (inode->i_bytes < bytes) {
915 inode->i_blocks--; 806 inode->i_blocks--;
916 inode->i_bytes += 512; 807 inode->i_bytes += 512;
917 } 808 }
918 inode->i_bytes -= bytes; 809 inode->i_bytes -= bytes;
919 } 810 }
920 811
921 EXPORT_SYMBOL(__inode_sub_bytes); 812 EXPORT_SYMBOL(__inode_sub_bytes);
922 813
923 void inode_sub_bytes(struct inode *inode, loff 814 void inode_sub_bytes(struct inode *inode, loff_t bytes)
924 { 815 {
925 spin_lock(&inode->i_lock); 816 spin_lock(&inode->i_lock);
926 __inode_sub_bytes(inode, bytes); 817 __inode_sub_bytes(inode, bytes);
927 spin_unlock(&inode->i_lock); 818 spin_unlock(&inode->i_lock);
928 } 819 }
929 820
930 EXPORT_SYMBOL(inode_sub_bytes); 821 EXPORT_SYMBOL(inode_sub_bytes);
931 822
932 loff_t inode_get_bytes(struct inode *inode) 823 loff_t inode_get_bytes(struct inode *inode)
933 { 824 {
934 loff_t ret; 825 loff_t ret;
935 826
936 spin_lock(&inode->i_lock); 827 spin_lock(&inode->i_lock);
937 ret = __inode_get_bytes(inode); 828 ret = __inode_get_bytes(inode);
938 spin_unlock(&inode->i_lock); 829 spin_unlock(&inode->i_lock);
939 return ret; 830 return ret;
940 } 831 }
941 832
942 EXPORT_SYMBOL(inode_get_bytes); 833 EXPORT_SYMBOL(inode_get_bytes);
943 834
944 void inode_set_bytes(struct inode *inode, loff 835 void inode_set_bytes(struct inode *inode, loff_t bytes)
945 { 836 {
946 /* Caller is here responsible for suff 837 /* Caller is here responsible for sufficient locking
947 * (ie. inode->i_lock) */ 838 * (ie. inode->i_lock) */
948 inode->i_blocks = bytes >> 9; 839 inode->i_blocks = bytes >> 9;
949 inode->i_bytes = bytes & 511; 840 inode->i_bytes = bytes & 511;
950 } 841 }
951 842
952 EXPORT_SYMBOL(inode_set_bytes); 843 EXPORT_SYMBOL(inode_set_bytes);
953 844
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