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/smp_lock.h>
12 #include <linux/highuid.h>
14 #include <linux/namei.h>
15 #include <linux/security.h>
16 #include <linux/syscalls.h>
17 #include <linux/pagemap.h>
19 #include <asm/uaccess.h>
20 #include <asm/unistd.h>
22 void generic_fillattr(struct inode *inode, struct kstat *stat)
24 stat->dev = inode->i_sb->s_dev;
25 stat->ino = inode->i_ino;
26 stat->mode = inode->i_mode;
27 stat->nlink = inode->i_nlink;
28 stat->uid = inode->i_uid;
29 stat->gid = inode->i_gid;
30 stat->tag = inode->i_tag;
31 stat->rdev = inode->i_rdev;
32 stat->atime = inode->i_atime;
33 stat->mtime = inode->i_mtime;
34 stat->ctime = inode->i_ctime;
35 stat->size = i_size_read(inode);
36 stat->blocks = inode->i_blocks;
37 stat->blksize = (1 << inode->i_blkbits);
40 EXPORT_SYMBOL(generic_fillattr);
42 int vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
44 struct inode *inode = dentry->d_inode;
47 retval = security_inode_getattr(mnt, dentry);
51 if (inode->i_op->getattr)
52 return inode->i_op->getattr(mnt, dentry, stat);
54 generic_fillattr(inode, stat);
58 EXPORT_SYMBOL(vfs_getattr);
60 int vfs_stat_fd(int dfd, char __user *name, struct kstat *stat)
65 error = __user_walk_fd(dfd, name, LOOKUP_FOLLOW, &nd);
67 error = vfs_getattr(nd.mnt, nd.dentry, stat);
73 int vfs_stat(char __user *name, struct kstat *stat)
75 return vfs_stat_fd(AT_FDCWD, name, stat);
78 EXPORT_SYMBOL(vfs_stat);
80 int vfs_lstat_fd(int dfd, char __user *name, struct kstat *stat)
85 error = __user_walk_fd(dfd, name, 0, &nd);
87 error = vfs_getattr(nd.mnt, nd.dentry, stat);
93 int vfs_lstat(char __user *name, struct kstat *stat)
95 return vfs_lstat_fd(AT_FDCWD, name, stat);
98 EXPORT_SYMBOL(vfs_lstat);
100 int vfs_fstat(unsigned int fd, struct kstat *stat)
102 struct file *f = fget(fd);
106 error = vfs_getattr(f->f_path.mnt, f->f_path.dentry, stat);
112 EXPORT_SYMBOL(vfs_fstat);
114 #ifdef __ARCH_WANT_OLD_STAT
117 * For backward compatibility? Maybe this should be moved
118 * into arch/i386 instead?
120 static int cp_old_stat(struct kstat *stat, struct __old_kernel_stat __user * statbuf)
122 static int warncount = 5;
123 struct __old_kernel_stat tmp;
127 printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n",
129 } else if (warncount < 0) {
130 /* it's laughable, but... */
134 memset(&tmp, 0, sizeof(struct __old_kernel_stat));
135 tmp.st_dev = old_encode_dev(stat->dev);
136 tmp.st_ino = stat->ino;
137 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
139 tmp.st_mode = stat->mode;
140 tmp.st_nlink = stat->nlink;
141 if (tmp.st_nlink != stat->nlink)
143 SET_UID(tmp.st_uid, stat->uid);
144 SET_GID(tmp.st_gid, stat->gid);
145 tmp.st_rdev = old_encode_dev(stat->rdev);
146 #if BITS_PER_LONG == 32
147 if (stat->size > MAX_NON_LFS)
150 tmp.st_size = stat->size;
151 tmp.st_atime = stat->atime.tv_sec;
152 tmp.st_mtime = stat->mtime.tv_sec;
153 tmp.st_ctime = stat->ctime.tv_sec;
154 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
157 asmlinkage long sys_stat(char __user * filename, struct __old_kernel_stat __user * statbuf)
160 int error = vfs_stat_fd(AT_FDCWD, filename, &stat);
163 error = cp_old_stat(&stat, statbuf);
167 asmlinkage long sys_lstat(char __user * filename, struct __old_kernel_stat __user * statbuf)
170 int error = vfs_lstat_fd(AT_FDCWD, filename, &stat);
173 error = cp_old_stat(&stat, statbuf);
177 asmlinkage long sys_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 asmlinkage long sys_newstat(char __user *filename, struct stat __user *statbuf)
243 int error = vfs_stat_fd(AT_FDCWD, filename, &stat);
246 error = cp_new_stat(&stat, statbuf);
251 asmlinkage long sys_newlstat(char __user *filename, struct stat __user *statbuf)
254 int error = vfs_lstat_fd(AT_FDCWD, filename, &stat);
257 error = cp_new_stat(&stat, statbuf);
262 #if !defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_SYS_NEWFSTATAT)
263 asmlinkage long sys_newfstatat(int dfd, char __user *filename,
264 struct stat __user *statbuf, int flag)
269 if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
272 if (flag & AT_SYMLINK_NOFOLLOW)
273 error = vfs_lstat_fd(dfd, filename, &stat);
275 error = vfs_stat_fd(dfd, filename, &stat);
278 error = cp_new_stat(&stat, statbuf);
285 asmlinkage long sys_newfstat(unsigned int fd, struct stat __user *statbuf)
288 int error = vfs_fstat(fd, &stat);
291 error = cp_new_stat(&stat, statbuf);
296 asmlinkage long sys_readlinkat(int dfd, const char __user *path,
297 char __user *buf, int bufsiz)
305 error = __user_walk_fd(dfd, path, 0, &nd);
307 struct inode * inode = nd.dentry->d_inode;
310 if (inode->i_op && inode->i_op->readlink) {
311 error = security_inode_readlink(nd.dentry);
313 touch_atime(nd.mnt, nd.dentry);
314 error = inode->i_op->readlink(nd.dentry, buf, bufsiz);
322 asmlinkage long sys_readlink(const char __user *path, char __user *buf,
325 return sys_readlinkat(AT_FDCWD, path, buf, bufsiz);
329 /* ---------- LFS-64 ----------- */
330 #ifdef __ARCH_WANT_STAT64
332 static long cp_new_stat64(struct kstat *stat, struct stat64 __user *statbuf)
336 memset(&tmp, 0, sizeof(struct stat64));
338 /* mips has weird padding, so we don't get 64 bits there */
339 if (!new_valid_dev(stat->dev) || !new_valid_dev(stat->rdev))
341 tmp.st_dev = new_encode_dev(stat->dev);
342 tmp.st_rdev = new_encode_dev(stat->rdev);
344 tmp.st_dev = huge_encode_dev(stat->dev);
345 tmp.st_rdev = huge_encode_dev(stat->rdev);
347 tmp.st_ino = stat->ino;
348 if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
350 #ifdef STAT64_HAS_BROKEN_ST_INO
351 tmp.__st_ino = stat->ino;
353 tmp.st_mode = stat->mode;
354 tmp.st_nlink = stat->nlink;
355 tmp.st_uid = stat->uid;
356 tmp.st_gid = stat->gid;
357 tmp.st_atime = stat->atime.tv_sec;
358 tmp.st_atime_nsec = stat->atime.tv_nsec;
359 tmp.st_mtime = stat->mtime.tv_sec;
360 tmp.st_mtime_nsec = stat->mtime.tv_nsec;
361 tmp.st_ctime = stat->ctime.tv_sec;
362 tmp.st_ctime_nsec = stat->ctime.tv_nsec;
363 tmp.st_size = stat->size;
364 tmp.st_blocks = stat->blocks;
365 tmp.st_blksize = stat->blksize;
366 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
369 asmlinkage long sys_stat64(char __user * filename, struct stat64 __user * statbuf)
372 int error = vfs_stat(filename, &stat);
375 error = cp_new_stat64(&stat, statbuf);
379 asmlinkage long sys_lstat64(char __user * filename, struct stat64 __user * statbuf)
382 int error = vfs_lstat(filename, &stat);
385 error = cp_new_stat64(&stat, statbuf);
389 asmlinkage long sys_fstat64(unsigned long fd, struct stat64 __user * statbuf)
392 int error = vfs_fstat(fd, &stat);
395 error = cp_new_stat64(&stat, statbuf);
400 asmlinkage long sys_fstatat64(int dfd, char __user *filename,
401 struct stat64 __user *statbuf, int flag)
406 if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
409 if (flag & AT_SYMLINK_NOFOLLOW)
410 error = vfs_lstat_fd(dfd, filename, &stat);
412 error = vfs_stat_fd(dfd, filename, &stat);
415 error = cp_new_stat64(&stat, statbuf);
420 #endif /* __ARCH_WANT_STAT64 */
422 void inode_add_bytes(struct inode *inode, loff_t bytes)
424 spin_lock(&inode->i_lock);
425 inode->i_blocks += bytes >> 9;
427 inode->i_bytes += bytes;
428 if (inode->i_bytes >= 512) {
430 inode->i_bytes -= 512;
432 spin_unlock(&inode->i_lock);
435 EXPORT_SYMBOL(inode_add_bytes);
437 void inode_sub_bytes(struct inode *inode, loff_t bytes)
439 spin_lock(&inode->i_lock);
440 inode->i_blocks -= bytes >> 9;
442 if (inode->i_bytes < bytes) {
444 inode->i_bytes += 512;
446 inode->i_bytes -= bytes;
447 spin_unlock(&inode->i_lock);
450 EXPORT_SYMBOL(inode_sub_bytes);
452 loff_t inode_get_bytes(struct inode *inode)
456 spin_lock(&inode->i_lock);
457 ret = (((loff_t)inode->i_blocks) << 9) + inode->i_bytes;
458 spin_unlock(&inode->i_lock);
462 EXPORT_SYMBOL(inode_get_bytes);
464 void inode_set_bytes(struct inode *inode, loff_t bytes)
466 /* Caller is here responsible for sufficient locking
467 * (ie. inode->i_lock) */
468 inode->i_blocks = bytes >> 9;
469 inode->i_bytes = bytes & 511;
472 EXPORT_SYMBOL(inode_set_bytes);