4 * Copyright (C) 1991, 1992 Linus Torvalds
7 #include <linux/export.h>
9 #include <linux/errno.h>
10 #include <linux/file.h>
11 #include <linux/highuid.h>
13 #include <linux/namei.h>
14 #include <linux/security.h>
15 #include <linux/syscalls.h>
16 #include <linux/pagemap.h>
18 #include <asm/uaccess.h>
19 #include <asm/unistd.h>
21 void generic_fillattr(struct inode *inode, struct kstat *stat)
23 stat->dev = inode->i_sb->s_dev;
24 stat->ino = inode->i_ino;
25 stat->mode = inode->i_mode;
26 stat->nlink = inode->i_nlink;
27 stat->uid = inode->i_uid;
28 stat->gid = inode->i_gid;
29 stat->rdev = inode->i_rdev;
30 stat->size = i_size_read(inode);
31 stat->atime = inode->i_atime;
32 stat->mtime = inode->i_mtime;
33 stat->ctime = inode->i_ctime;
34 stat->blksize = (1 << inode->i_blkbits);
35 stat->blocks = inode->i_blocks;
38 EXPORT_SYMBOL(generic_fillattr);
40 int vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
42 struct inode *inode = dentry->d_inode;
45 retval = security_inode_getattr(mnt, dentry);
49 if (inode->i_op->getattr)
50 return inode->i_op->getattr(mnt, dentry, stat);
52 generic_fillattr(inode, stat);
56 EXPORT_SYMBOL(vfs_getattr);
58 int vfs_fstat(unsigned int fd, struct kstat *stat)
61 struct file *f = fget_light(fd, &fput_needed);
65 error = vfs_getattr(f->f_path.mnt, f->f_path.dentry, stat);
66 fput_light(f, fput_needed);
70 EXPORT_SYMBOL(vfs_fstat);
72 int vfs_fstatat(int dfd, const char __user *filename, struct kstat *stat,
79 if ((flag & ~(AT_SYMLINK_NOFOLLOW | AT_NO_AUTOMOUNT |
83 if (!(flag & AT_SYMLINK_NOFOLLOW))
84 lookup_flags |= LOOKUP_FOLLOW;
85 if (flag & AT_EMPTY_PATH)
86 lookup_flags |= LOOKUP_EMPTY;
88 error = user_path_at(dfd, filename, lookup_flags, &path);
92 error = vfs_getattr(path.mnt, path.dentry, stat);
97 EXPORT_SYMBOL(vfs_fstatat);
99 int vfs_stat(const char __user *name, struct kstat *stat)
101 return vfs_fstatat(AT_FDCWD, name, stat, 0);
103 EXPORT_SYMBOL(vfs_stat);
105 int vfs_lstat(const char __user *name, struct kstat *stat)
107 return vfs_fstatat(AT_FDCWD, name, stat, AT_SYMLINK_NOFOLLOW);
109 EXPORT_SYMBOL(vfs_lstat);
112 #ifdef __ARCH_WANT_OLD_STAT
115 * For backward compatibility? Maybe this should be moved
116 * into arch/i386 instead?
118 static int cp_old_stat(struct kstat *stat, struct __old_kernel_stat __user * statbuf)
120 static int warncount = 5;
121 struct __old_kernel_stat tmp;
125 printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n",
127 } else if (warncount < 0) {
128 /* it's laughable, but... */
132 memset(&tmp, 0, sizeof(struct __old_kernel_stat));
133 tmp.st_dev = old_encode_dev(stat->dev);
134 tmp.st_ino = stat->ino;
135 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
137 tmp.st_mode = stat->mode;
138 tmp.st_nlink = stat->nlink;
139 if (tmp.st_nlink != stat->nlink)
141 SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
142 SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
143 tmp.st_rdev = old_encode_dev(stat->rdev);
144 #if BITS_PER_LONG == 32
145 if (stat->size > MAX_NON_LFS)
148 tmp.st_size = stat->size;
149 tmp.st_atime = stat->atime.tv_sec;
150 tmp.st_mtime = stat->mtime.tv_sec;
151 tmp.st_ctime = stat->ctime.tv_sec;
152 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
155 SYSCALL_DEFINE2(stat, const char __user *, filename,
156 struct __old_kernel_stat __user *, statbuf)
161 error = vfs_stat(filename, &stat);
165 return cp_old_stat(&stat, statbuf);
168 SYSCALL_DEFINE2(lstat, const char __user *, filename,
169 struct __old_kernel_stat __user *, statbuf)
174 error = vfs_lstat(filename, &stat);
178 return cp_old_stat(&stat, statbuf);
181 SYSCALL_DEFINE2(fstat, unsigned int, fd, struct __old_kernel_stat __user *, statbuf)
184 int error = vfs_fstat(fd, &stat);
187 error = cp_old_stat(&stat, statbuf);
192 #endif /* __ARCH_WANT_OLD_STAT */
194 #if BITS_PER_LONG == 32
195 # define choose_32_64(a,b) a
197 # define choose_32_64(a,b) b
200 #define valid_dev(x) choose_32_64(old_valid_dev,new_valid_dev)(x)
201 #define encode_dev(x) choose_32_64(old_encode_dev,new_encode_dev)(x)
203 #ifndef INIT_STRUCT_STAT_PADDING
204 # define INIT_STRUCT_STAT_PADDING(st) memset(&st, 0, sizeof(st))
207 static int cp_new_stat(struct kstat *stat, struct stat __user *statbuf)
211 if (!valid_dev(stat->dev) || !valid_dev(stat->rdev))
213 #if BITS_PER_LONG == 32
214 if (stat->size > MAX_NON_LFS)
218 INIT_STRUCT_STAT_PADDING(tmp);
219 tmp.st_dev = encode_dev(stat->dev);
220 tmp.st_ino = stat->ino;
221 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
223 tmp.st_mode = stat->mode;
224 tmp.st_nlink = stat->nlink;
225 if (tmp.st_nlink != stat->nlink)
227 SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
228 SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
229 tmp.st_rdev = encode_dev(stat->rdev);
230 tmp.st_size = stat->size;
231 tmp.st_atime = stat->atime.tv_sec;
232 tmp.st_mtime = stat->mtime.tv_sec;
233 tmp.st_ctime = stat->ctime.tv_sec;
234 #ifdef STAT_HAVE_NSEC
235 tmp.st_atime_nsec = stat->atime.tv_nsec;
236 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
237 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
239 tmp.st_blocks = stat->blocks;
240 tmp.st_blksize = stat->blksize;
241 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
244 SYSCALL_DEFINE2(newstat, const char __user *, filename,
245 struct stat __user *, statbuf)
248 int error = vfs_stat(filename, &stat);
252 return cp_new_stat(&stat, statbuf);
255 SYSCALL_DEFINE2(newlstat, const char __user *, filename,
256 struct stat __user *, statbuf)
261 error = vfs_lstat(filename, &stat);
265 return cp_new_stat(&stat, statbuf);
268 #if !defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_SYS_NEWFSTATAT)
269 SYSCALL_DEFINE4(newfstatat, int, dfd, const char __user *, filename,
270 struct stat __user *, statbuf, int, flag)
275 error = vfs_fstatat(dfd, filename, &stat, flag);
278 return cp_new_stat(&stat, statbuf);
282 SYSCALL_DEFINE2(newfstat, unsigned int, fd, struct stat __user *, statbuf)
285 int error = vfs_fstat(fd, &stat);
288 error = cp_new_stat(&stat, statbuf);
293 SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname,
294 char __user *, buf, int, bufsiz)
303 error = user_path_at_empty(dfd, pathname, LOOKUP_EMPTY, &path, &empty);
305 struct inode *inode = path.dentry->d_inode;
307 error = empty ? -ENOENT : -EINVAL;
308 if (inode->i_op->readlink) {
309 error = security_inode_readlink(path.dentry);
312 error = inode->i_op->readlink(path.dentry,
321 SYSCALL_DEFINE3(readlink, const char __user *, path, char __user *, buf,
324 return sys_readlinkat(AT_FDCWD, path, buf, bufsiz);
328 /* ---------- LFS-64 ----------- */
329 #ifdef __ARCH_WANT_STAT64
331 #ifndef INIT_STRUCT_STAT64_PADDING
332 # define INIT_STRUCT_STAT64_PADDING(st) memset(&st, 0, sizeof(st))
335 static long cp_new_stat64(struct kstat *stat, struct stat64 __user *statbuf)
339 INIT_STRUCT_STAT64_PADDING(tmp);
341 /* mips has weird padding, so we don't get 64 bits there */
342 if (!new_valid_dev(stat->dev) || !new_valid_dev(stat->rdev))
344 tmp.st_dev = new_encode_dev(stat->dev);
345 tmp.st_rdev = new_encode_dev(stat->rdev);
347 tmp.st_dev = huge_encode_dev(stat->dev);
348 tmp.st_rdev = huge_encode_dev(stat->rdev);
350 tmp.st_ino = stat->ino;
351 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
353 #ifdef STAT64_HAS_BROKEN_ST_INO
354 tmp.__st_ino = stat->ino;
356 tmp.st_mode = stat->mode;
357 tmp.st_nlink = stat->nlink;
358 tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
359 tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
360 tmp.st_atime = stat->atime.tv_sec;
361 tmp.st_atime_nsec = stat->atime.tv_nsec;
362 tmp.st_mtime = stat->mtime.tv_sec;
363 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
364 tmp.st_ctime = stat->ctime.tv_sec;
365 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
366 tmp.st_size = stat->size;
367 tmp.st_blocks = stat->blocks;
368 tmp.st_blksize = stat->blksize;
369 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
372 SYSCALL_DEFINE2(stat64, const char __user *, filename,
373 struct stat64 __user *, statbuf)
376 int error = vfs_stat(filename, &stat);
379 error = cp_new_stat64(&stat, statbuf);
384 SYSCALL_DEFINE2(lstat64, const char __user *, filename,
385 struct stat64 __user *, statbuf)
388 int error = vfs_lstat(filename, &stat);
391 error = cp_new_stat64(&stat, statbuf);
396 SYSCALL_DEFINE2(fstat64, unsigned long, fd, struct stat64 __user *, statbuf)
399 int error = vfs_fstat(fd, &stat);
402 error = cp_new_stat64(&stat, statbuf);
407 SYSCALL_DEFINE4(fstatat64, int, dfd, const char __user *, filename,
408 struct stat64 __user *, statbuf, int, flag)
413 error = vfs_fstatat(dfd, filename, &stat, flag);
416 return cp_new_stat64(&stat, statbuf);
418 #endif /* __ARCH_WANT_STAT64 */
420 /* Caller is here responsible for sufficient locking (ie. inode->i_lock) */
421 void __inode_add_bytes(struct inode *inode, loff_t bytes)
423 inode->i_blocks += bytes >> 9;
425 inode->i_bytes += bytes;
426 if (inode->i_bytes >= 512) {
428 inode->i_bytes -= 512;
432 void inode_add_bytes(struct inode *inode, loff_t bytes)
434 spin_lock(&inode->i_lock);
435 __inode_add_bytes(inode, bytes);
436 spin_unlock(&inode->i_lock);
439 EXPORT_SYMBOL(inode_add_bytes);
441 void inode_sub_bytes(struct inode *inode, loff_t bytes)
443 spin_lock(&inode->i_lock);
444 inode->i_blocks -= bytes >> 9;
446 if (inode->i_bytes < bytes) {
448 inode->i_bytes += 512;
450 inode->i_bytes -= bytes;
451 spin_unlock(&inode->i_lock);
454 EXPORT_SYMBOL(inode_sub_bytes);
456 loff_t inode_get_bytes(struct inode *inode)
460 spin_lock(&inode->i_lock);
461 ret = (((loff_t)inode->i_blocks) << 9) + inode->i_bytes;
462 spin_unlock(&inode->i_lock);
466 EXPORT_SYMBOL(inode_get_bytes);
468 void inode_set_bytes(struct inode *inode, loff_t bytes)
470 /* Caller is here responsible for sufficient locking
471 * (ie. inode->i_lock) */
472 inode->i_blocks = bytes >> 9;
473 inode->i_bytes = bytes & 511;
476 EXPORT_SYMBOL(inode_set_bytes);