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_stat_fd(int dfd, char __user *name, struct kstat *stat)
63 error = user_path_at(dfd, name, LOOKUP_FOLLOW, &path);
65 error = vfs_getattr(path.mnt, path.dentry, stat);
71 int vfs_stat(char __user *name, struct kstat *stat)
73 return vfs_stat_fd(AT_FDCWD, name, stat);
76 EXPORT_SYMBOL(vfs_stat);
78 int vfs_lstat_fd(int dfd, char __user *name, struct kstat *stat)
83 error = user_path_at(dfd, name, 0, &path);
85 error = vfs_getattr(path.mnt, path.dentry, stat);
91 int vfs_lstat(char __user *name, struct kstat *stat)
93 return vfs_lstat_fd(AT_FDCWD, name, stat);
96 EXPORT_SYMBOL(vfs_lstat);
98 int vfs_fstat(unsigned int fd, struct kstat *stat)
100 struct file *f = fget(fd);
104 error = vfs_getattr(f->f_path.mnt, f->f_path.dentry, stat);
110 EXPORT_SYMBOL(vfs_fstat);
112 int vfs_fstatat(int dfd, char __user *filename, struct kstat *stat, int flag)
116 if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
119 if (flag & AT_SYMLINK_NOFOLLOW)
120 error = vfs_lstat_fd(dfd, filename, stat);
122 error = vfs_stat_fd(dfd, filename, stat);
127 EXPORT_SYMBOL(vfs_fstatat);
130 #ifdef __ARCH_WANT_OLD_STAT
133 * For backward compatibility? Maybe this should be moved
134 * into arch/i386 instead?
136 static int cp_old_stat(struct kstat *stat, struct __old_kernel_stat __user * statbuf)
138 static int warncount = 5;
139 struct __old_kernel_stat tmp;
143 printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n",
145 } else if (warncount < 0) {
146 /* it's laughable, but... */
150 memset(&tmp, 0, sizeof(struct __old_kernel_stat));
151 tmp.st_dev = old_encode_dev(stat->dev);
152 tmp.st_ino = stat->ino;
153 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
155 tmp.st_mode = stat->mode;
156 tmp.st_nlink = stat->nlink;
157 if (tmp.st_nlink != stat->nlink)
159 SET_UID(tmp.st_uid, stat->uid);
160 SET_GID(tmp.st_gid, stat->gid);
161 tmp.st_rdev = old_encode_dev(stat->rdev);
162 #if BITS_PER_LONG == 32
163 if (stat->size > MAX_NON_LFS)
166 tmp.st_size = stat->size;
167 tmp.st_atime = stat->atime.tv_sec;
168 tmp.st_mtime = stat->mtime.tv_sec;
169 tmp.st_ctime = stat->ctime.tv_sec;
170 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
173 SYSCALL_DEFINE2(stat, char __user *, filename, struct __old_kernel_stat __user *, statbuf)
176 int error = vfs_stat_fd(AT_FDCWD, filename, &stat);
179 error = cp_old_stat(&stat, statbuf);
184 SYSCALL_DEFINE2(lstat, char __user *, filename, struct __old_kernel_stat __user *, statbuf)
187 int error = vfs_lstat_fd(AT_FDCWD, filename, &stat);
190 error = cp_old_stat(&stat, statbuf);
195 SYSCALL_DEFINE2(fstat, unsigned int, fd, struct __old_kernel_stat __user *, statbuf)
198 int error = vfs_fstat(fd, &stat);
201 error = cp_old_stat(&stat, statbuf);
206 #endif /* __ARCH_WANT_OLD_STAT */
208 static int cp_new_stat(struct kstat *stat, struct stat __user *statbuf)
212 #if BITS_PER_LONG == 32
213 if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev))
216 if (!new_valid_dev(stat->dev) || !new_valid_dev(stat->rdev))
220 memset(&tmp, 0, sizeof(tmp));
221 #if BITS_PER_LONG == 32
222 tmp.st_dev = old_encode_dev(stat->dev);
224 tmp.st_dev = new_encode_dev(stat->dev);
226 tmp.st_ino = stat->ino;
227 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
229 tmp.st_mode = stat->mode;
230 tmp.st_nlink = stat->nlink;
231 if (tmp.st_nlink != stat->nlink)
233 SET_UID(tmp.st_uid, stat->uid);
234 SET_GID(tmp.st_gid, stat->gid);
235 #if BITS_PER_LONG == 32
236 tmp.st_rdev = old_encode_dev(stat->rdev);
238 tmp.st_rdev = new_encode_dev(stat->rdev);
240 #if BITS_PER_LONG == 32
241 if (stat->size > MAX_NON_LFS)
244 tmp.st_size = stat->size;
245 tmp.st_atime = stat->atime.tv_sec;
246 tmp.st_mtime = stat->mtime.tv_sec;
247 tmp.st_ctime = stat->ctime.tv_sec;
248 #ifdef STAT_HAVE_NSEC
249 tmp.st_atime_nsec = stat->atime.tv_nsec;
250 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
251 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
253 tmp.st_blocks = stat->blocks;
254 tmp.st_blksize = stat->blksize;
255 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
258 SYSCALL_DEFINE2(newstat, char __user *, filename, struct stat __user *, statbuf)
261 int error = vfs_stat_fd(AT_FDCWD, filename, &stat);
264 error = cp_new_stat(&stat, statbuf);
269 SYSCALL_DEFINE2(newlstat, char __user *, filename, struct stat __user *, statbuf)
272 int error = vfs_lstat_fd(AT_FDCWD, filename, &stat);
275 error = cp_new_stat(&stat, statbuf);
280 #if !defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_SYS_NEWFSTATAT)
281 SYSCALL_DEFINE4(newfstatat, int, dfd, char __user *, filename,
282 struct stat __user *, statbuf, int, flag)
287 error = vfs_fstatat(dfd, filename, &stat, flag);
290 return cp_new_stat(&stat, statbuf);
294 SYSCALL_DEFINE2(newfstat, unsigned int, fd, struct stat __user *, statbuf)
297 int error = vfs_fstat(fd, &stat);
300 error = cp_new_stat(&stat, statbuf);
305 SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname,
306 char __user *, buf, int, bufsiz)
314 error = user_path_at(dfd, pathname, 0, &path);
316 struct inode *inode = path.dentry->d_inode;
319 if (inode->i_op->readlink) {
320 error = security_inode_readlink(path.dentry);
322 touch_atime(path.mnt, path.dentry);
323 error = inode->i_op->readlink(path.dentry,
332 SYSCALL_DEFINE3(readlink, const char __user *, path, char __user *, buf,
335 return sys_readlinkat(AT_FDCWD, path, buf, bufsiz);
339 /* ---------- LFS-64 ----------- */
340 #ifdef __ARCH_WANT_STAT64
342 static long cp_new_stat64(struct kstat *stat, struct stat64 __user *statbuf)
346 memset(&tmp, 0, sizeof(struct stat64));
348 /* mips has weird padding, so we don't get 64 bits there */
349 if (!new_valid_dev(stat->dev) || !new_valid_dev(stat->rdev))
351 tmp.st_dev = new_encode_dev(stat->dev);
352 tmp.st_rdev = new_encode_dev(stat->rdev);
354 tmp.st_dev = huge_encode_dev(stat->dev);
355 tmp.st_rdev = huge_encode_dev(stat->rdev);
357 tmp.st_ino = stat->ino;
358 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
360 #ifdef STAT64_HAS_BROKEN_ST_INO
361 tmp.__st_ino = stat->ino;
363 tmp.st_mode = stat->mode;
364 tmp.st_nlink = stat->nlink;
365 tmp.st_uid = stat->uid;
366 tmp.st_gid = stat->gid;
367 tmp.st_atime = stat->atime.tv_sec;
368 tmp.st_atime_nsec = stat->atime.tv_nsec;
369 tmp.st_mtime = stat->mtime.tv_sec;
370 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
371 tmp.st_ctime = stat->ctime.tv_sec;
372 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
373 tmp.st_size = stat->size;
374 tmp.st_blocks = stat->blocks;
375 tmp.st_blksize = stat->blksize;
376 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
379 SYSCALL_DEFINE2(stat64, char __user *, filename, struct stat64 __user *, statbuf)
382 int error = vfs_stat(filename, &stat);
385 error = cp_new_stat64(&stat, statbuf);
390 SYSCALL_DEFINE2(lstat64, char __user *, filename, struct stat64 __user *, statbuf)
393 int error = vfs_lstat(filename, &stat);
396 error = cp_new_stat64(&stat, statbuf);
401 SYSCALL_DEFINE2(fstat64, unsigned long, fd, struct stat64 __user *, statbuf)
404 int error = vfs_fstat(fd, &stat);
407 error = cp_new_stat64(&stat, statbuf);
412 SYSCALL_DEFINE4(fstatat64, int, dfd, char __user *, filename,
413 struct stat64 __user *, statbuf, int, flag)
418 error = vfs_fstatat(dfd, filename, &stat, flag);
421 return cp_new_stat64(&stat, statbuf);
423 #endif /* __ARCH_WANT_STAT64 */
425 void inode_add_bytes(struct inode *inode, loff_t bytes)
427 spin_lock(&inode->i_lock);
428 inode->i_blocks += bytes >> 9;
430 inode->i_bytes += bytes;
431 if (inode->i_bytes >= 512) {
433 inode->i_bytes -= 512;
435 spin_unlock(&inode->i_lock);
438 EXPORT_SYMBOL(inode_add_bytes);
440 void inode_sub_bytes(struct inode *inode, loff_t bytes)
442 spin_lock(&inode->i_lock);
443 inode->i_blocks -= bytes >> 9;
445 if (inode->i_bytes < bytes) {
447 inode->i_bytes += 512;
449 inode->i_bytes -= bytes;
450 spin_unlock(&inode->i_lock);
453 EXPORT_SYMBOL(inode_sub_bytes);
455 loff_t inode_get_bytes(struct inode *inode)
459 spin_lock(&inode->i_lock);
460 ret = (((loff_t)inode->i_blocks) << 9) + inode->i_bytes;
461 spin_unlock(&inode->i_lock);
465 EXPORT_SYMBOL(inode_get_bytes);
467 void inode_set_bytes(struct inode *inode, loff_t bytes)
469 /* Caller is here responsible for sufficient locking
470 * (ie. inode->i_lock) */
471 inode->i_blocks = bytes >> 9;
472 inode->i_bytes = bytes & 511;
475 EXPORT_SYMBOL(inode_set_bytes);