4 * Copyright (C) 1991, 1992 Linus Torvalds
7 #include <linux/module.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->atime = inode->i_atime;
31 stat->mtime = inode->i_mtime;
32 stat->ctime = inode->i_ctime;
33 stat->size = i_size_read(inode);
34 stat->blocks = inode->i_blocks;
35 stat->blksize = (1 << inode->i_blkbits);
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)
60 struct file *f = fget(fd);
64 error = vfs_getattr(f->f_path.mnt, f->f_path.dentry, stat);
69 EXPORT_SYMBOL(vfs_fstat);
71 int vfs_fstatat(int dfd, const char __user *filename, struct kstat *stat,
78 if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
81 if (!(flag & AT_SYMLINK_NOFOLLOW))
82 lookup_flags |= LOOKUP_FOLLOW;
84 error = user_path_at(dfd, filename, lookup_flags, &path);
88 error = vfs_getattr(path.mnt, path.dentry, stat);
93 EXPORT_SYMBOL(vfs_fstatat);
95 int vfs_stat(const char __user *name, struct kstat *stat)
97 return vfs_fstatat(AT_FDCWD, name, stat, 0);
99 EXPORT_SYMBOL(vfs_stat);
101 int vfs_lstat(const char __user *name, struct kstat *stat)
103 return vfs_fstatat(AT_FDCWD, name, stat, AT_SYMLINK_NOFOLLOW);
105 EXPORT_SYMBOL(vfs_lstat);
108 #ifdef __ARCH_WANT_OLD_STAT
111 * For backward compatibility? Maybe this should be moved
112 * into arch/i386 instead?
114 static int cp_old_stat(struct kstat *stat, struct __old_kernel_stat __user * statbuf)
116 static int warncount = 5;
117 struct __old_kernel_stat tmp;
121 printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n",
123 } else if (warncount < 0) {
124 /* it's laughable, but... */
128 memset(&tmp, 0, sizeof(struct __old_kernel_stat));
129 tmp.st_dev = old_encode_dev(stat->dev);
130 tmp.st_ino = stat->ino;
131 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
133 tmp.st_mode = stat->mode;
134 tmp.st_nlink = stat->nlink;
135 if (tmp.st_nlink != stat->nlink)
137 SET_UID(tmp.st_uid, stat->uid);
138 SET_GID(tmp.st_gid, stat->gid);
139 tmp.st_rdev = old_encode_dev(stat->rdev);
140 #if BITS_PER_LONG == 32
141 if (stat->size > MAX_NON_LFS)
144 tmp.st_size = stat->size;
145 tmp.st_atime = stat->atime.tv_sec;
146 tmp.st_mtime = stat->mtime.tv_sec;
147 tmp.st_ctime = stat->ctime.tv_sec;
148 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
151 SYSCALL_DEFINE2(stat, const char __user *, filename,
152 struct __old_kernel_stat __user *, statbuf)
157 error = vfs_stat(filename, &stat);
161 return cp_old_stat(&stat, statbuf);
164 SYSCALL_DEFINE2(lstat, const char __user *, filename,
165 struct __old_kernel_stat __user *, statbuf)
170 error = vfs_lstat(filename, &stat);
174 return cp_old_stat(&stat, statbuf);
177 SYSCALL_DEFINE2(fstat, unsigned int, fd, struct __old_kernel_stat __user *, statbuf)
180 int error = vfs_fstat(fd, &stat);
183 error = cp_old_stat(&stat, statbuf);
188 #endif /* __ARCH_WANT_OLD_STAT */
190 static int cp_new_stat(struct kstat *stat, struct stat __user *statbuf)
194 #if BITS_PER_LONG == 32
195 if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev))
198 if (!new_valid_dev(stat->dev) || !new_valid_dev(stat->rdev))
202 memset(&tmp, 0, sizeof(tmp));
203 #if BITS_PER_LONG == 32
204 tmp.st_dev = old_encode_dev(stat->dev);
206 tmp.st_dev = new_encode_dev(stat->dev);
208 tmp.st_ino = stat->ino;
209 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
211 tmp.st_mode = stat->mode;
212 tmp.st_nlink = stat->nlink;
213 if (tmp.st_nlink != stat->nlink)
215 SET_UID(tmp.st_uid, stat->uid);
216 SET_GID(tmp.st_gid, stat->gid);
217 #if BITS_PER_LONG == 32
218 tmp.st_rdev = old_encode_dev(stat->rdev);
220 tmp.st_rdev = new_encode_dev(stat->rdev);
222 #if BITS_PER_LONG == 32
223 if (stat->size > MAX_NON_LFS)
226 tmp.st_size = stat->size;
227 tmp.st_atime = stat->atime.tv_sec;
228 tmp.st_mtime = stat->mtime.tv_sec;
229 tmp.st_ctime = stat->ctime.tv_sec;
230 #ifdef STAT_HAVE_NSEC
231 tmp.st_atime_nsec = stat->atime.tv_nsec;
232 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
233 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
235 tmp.st_blocks = stat->blocks;
236 tmp.st_blksize = stat->blksize;
237 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
240 SYSCALL_DEFINE2(newstat, const char __user *, filename,
241 struct stat __user *, statbuf)
244 int error = vfs_stat(filename, &stat);
248 return cp_new_stat(&stat, statbuf);
251 SYSCALL_DEFINE2(newlstat, const char __user *, filename,
252 struct stat __user *, statbuf)
257 error = vfs_lstat(filename, &stat);
261 return cp_new_stat(&stat, statbuf);
264 #if !defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_SYS_NEWFSTATAT)
265 SYSCALL_DEFINE4(newfstatat, int, dfd, const char __user *, filename,
266 struct stat __user *, statbuf, int, flag)
271 error = vfs_fstatat(dfd, filename, &stat, flag);
274 return cp_new_stat(&stat, statbuf);
278 SYSCALL_DEFINE2(newfstat, unsigned int, fd, struct stat __user *, statbuf)
281 int error = vfs_fstat(fd, &stat);
284 error = cp_new_stat(&stat, statbuf);
289 SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname,
290 char __user *, buf, int, bufsiz)
298 error = user_path_at(dfd, pathname, 0, &path);
300 struct inode *inode = path.dentry->d_inode;
303 if (inode->i_op->readlink) {
304 error = security_inode_readlink(path.dentry);
306 touch_atime(path.mnt, path.dentry);
307 error = inode->i_op->readlink(path.dentry,
316 SYSCALL_DEFINE3(readlink, const char __user *, path, char __user *, buf,
319 return sys_readlinkat(AT_FDCWD, path, buf, bufsiz);
323 /* ---------- LFS-64 ----------- */
324 #ifdef __ARCH_WANT_STAT64
326 static long cp_new_stat64(struct kstat *stat, struct stat64 __user *statbuf)
330 memset(&tmp, 0, sizeof(struct stat64));
332 /* mips has weird padding, so we don't get 64 bits there */
333 if (!new_valid_dev(stat->dev) || !new_valid_dev(stat->rdev))
335 tmp.st_dev = new_encode_dev(stat->dev);
336 tmp.st_rdev = new_encode_dev(stat->rdev);
338 tmp.st_dev = huge_encode_dev(stat->dev);
339 tmp.st_rdev = huge_encode_dev(stat->rdev);
341 tmp.st_ino = stat->ino;
342 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
344 #ifdef STAT64_HAS_BROKEN_ST_INO
345 tmp.__st_ino = stat->ino;
347 tmp.st_mode = stat->mode;
348 tmp.st_nlink = stat->nlink;
349 tmp.st_uid = stat->uid;
350 tmp.st_gid = stat->gid;
351 tmp.st_atime = stat->atime.tv_sec;
352 tmp.st_atime_nsec = stat->atime.tv_nsec;
353 tmp.st_mtime = stat->mtime.tv_sec;
354 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
355 tmp.st_ctime = stat->ctime.tv_sec;
356 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
357 tmp.st_size = stat->size;
358 tmp.st_blocks = stat->blocks;
359 tmp.st_blksize = stat->blksize;
360 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
363 SYSCALL_DEFINE2(stat64, const char __user *, filename,
364 struct stat64 __user *, statbuf)
367 int error = vfs_stat(filename, &stat);
370 error = cp_new_stat64(&stat, statbuf);
375 SYSCALL_DEFINE2(lstat64, const char __user *, filename,
376 struct stat64 __user *, statbuf)
379 int error = vfs_lstat(filename, &stat);
382 error = cp_new_stat64(&stat, statbuf);
387 SYSCALL_DEFINE2(fstat64, unsigned long, fd, struct stat64 __user *, statbuf)
390 int error = vfs_fstat(fd, &stat);
393 error = cp_new_stat64(&stat, statbuf);
398 SYSCALL_DEFINE4(fstatat64, int, dfd, const char __user *, filename,
399 struct stat64 __user *, statbuf, int, flag)
404 error = vfs_fstatat(dfd, filename, &stat, flag);
407 return cp_new_stat64(&stat, statbuf);
409 #endif /* __ARCH_WANT_STAT64 */
411 /* Caller is here responsible for sufficient locking (ie. inode->i_lock) */
412 void __inode_add_bytes(struct inode *inode, loff_t bytes)
414 inode->i_blocks += bytes >> 9;
416 inode->i_bytes += bytes;
417 if (inode->i_bytes >= 512) {
419 inode->i_bytes -= 512;
423 void inode_add_bytes(struct inode *inode, loff_t bytes)
425 spin_lock(&inode->i_lock);
426 __inode_add_bytes(inode, bytes);
427 spin_unlock(&inode->i_lock);
430 EXPORT_SYMBOL(inode_add_bytes);
432 void inode_sub_bytes(struct inode *inode, loff_t bytes)
434 spin_lock(&inode->i_lock);
435 inode->i_blocks -= bytes >> 9;
437 if (inode->i_bytes < bytes) {
439 inode->i_bytes += 512;
441 inode->i_bytes -= bytes;
442 spin_unlock(&inode->i_lock);
445 EXPORT_SYMBOL(inode_sub_bytes);
447 loff_t inode_get_bytes(struct inode *inode)
451 spin_lock(&inode->i_lock);
452 ret = (((loff_t)inode->i_blocks) << 9) + inode->i_bytes;
453 spin_unlock(&inode->i_lock);
457 EXPORT_SYMBOL(inode_get_bytes);
459 void inode_set_bytes(struct inode *inode, loff_t bytes)
461 /* Caller is here responsible for sufficient locking
462 * (ie. inode->i_lock) */
463 inode->i_blocks = bytes >> 9;
464 inode->i_bytes = bytes & 511;
467 EXPORT_SYMBOL(inode_set_bytes);