/*
* linux/fs/stat.c
*
* Copyright (C) 1991, 1992 Linus Torvalds
*/
#include <linux/mm.h>
#include <linux/errno.h>
#include <linux/file.h>
#include <linux/smp_lock.h>
#include <linux/highuid.h>
#include <asm/uaccess.h>
/*
* Revalidate the inode. This is required for proper NFS attribute caching.
*/
static __inline__ int
19 do_revalidate(struct dentry *dentry)
{
struct inode * inode = dentry->d_inode;
22 if (inode->i_op && inode->i_op->revalidate)
23 return inode->i_op->revalidate(dentry);
24 return 0;
}
#if !defined(__alpha__) && !defined(__sparc__) && !defined(__ia64__) && !defined(__s390__) && !defined(__hppa__)
/*
* For backward compatibility? Maybe this should be moved
* into arch/i386 instead?
*/
34 static int cp_old_stat(struct inode * inode, struct __old_kernel_stat * statbuf)
{
static int warncount = 5;
struct __old_kernel_stat tmp;
39 if (warncount > 0) {
warncount--;
printk("VFS: Warning: %s using old stat() call. Recompile your binary.\n",
current->comm);
43 } else if (warncount < 0) {
/* it's laughable, but... */
warncount = 0;
}
tmp.st_dev = kdev_t_to_nr(inode->i_dev);
tmp.st_ino = inode->i_ino;
tmp.st_mode = inode->i_mode;
tmp.st_nlink = inode->i_nlink;
SET_OLDSTAT_UID(tmp, inode->i_uid);
SET_OLDSTAT_GID(tmp, inode->i_gid);
tmp.st_rdev = kdev_t_to_nr(inode->i_rdev);
#if BITS_PER_LONG == 32
56 if (inode->i_size > 0x7fffffff)
57 return -EOVERFLOW;
#endif
tmp.st_size = inode->i_size;
tmp.st_atime = inode->i_atime;
tmp.st_mtime = inode->i_mtime;
tmp.st_ctime = inode->i_ctime;
63 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
}
#endif
68 static int cp_new_stat(struct inode * inode, struct stat * statbuf)
{
struct stat tmp;
unsigned int blocks, indirect;
memset(&tmp, 0, sizeof(tmp));
tmp.st_dev = kdev_t_to_nr(inode->i_dev);
tmp.st_ino = inode->i_ino;
tmp.st_mode = inode->i_mode;
tmp.st_nlink = inode->i_nlink;
SET_STAT_UID(tmp, inode->i_uid);
SET_STAT_GID(tmp, inode->i_gid);
tmp.st_rdev = kdev_t_to_nr(inode->i_rdev);
#if BITS_PER_LONG == 32
82 if (inode->i_size > 0x7fffffff)
83 return -EOVERFLOW;
#endif
tmp.st_size = inode->i_size;
tmp.st_atime = inode->i_atime;
tmp.st_mtime = inode->i_mtime;
tmp.st_ctime = inode->i_ctime;
/*
* st_blocks and st_blksize are approximated with a simple algorithm if
* they aren't supported directly by the filesystem. The minix and msdos
* filesystems don't keep track of blocks, so they would either have to
* be counted explicitly (by delving into the file itself), or by using
* this simple algorithm to get a reasonable (although not 100% accurate)
* value.
*/
/*
* Use minix fs values for the number of direct and indirect blocks. The
* count is now exact for the minix fs except that it counts zero blocks.
* Everything is in units of BLOCK_SIZE until the assignment to
* tmp.st_blksize.
*/
#define D_B 7
#define I_B (BLOCK_SIZE / sizeof(unsigned short))
107 if (!inode->i_blksize) {
blocks = (tmp.st_size + BLOCK_SIZE - 1) / BLOCK_SIZE;
109 if (blocks > D_B) {
indirect = (blocks - D_B + I_B - 1) / I_B;
blocks += indirect;
112 if (indirect > 1) {
indirect = (indirect - 1 + I_B - 1) / I_B;
blocks += indirect;
115 if (indirect > 1)
blocks++;
}
}
tmp.st_blocks = (BLOCK_SIZE / 512) * blocks;
tmp.st_blksize = BLOCK_SIZE;
121 } else {
tmp.st_blocks = inode->i_blocks;
tmp.st_blksize = inode->i_blksize;
}
125 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
}
#if !defined(__alpha__) && !defined(__sparc__) && !defined(__ia64__) && !defined(__s390__) && !defined(__hppa__)
/*
* For backward compatibility? Maybe this should be moved
* into arch/i386 instead?
*/
134 asmlinkage long sys_stat(char * filename, struct __old_kernel_stat * statbuf)
{
struct nameidata nd;
int error;
error = user_path_walk(filename, &nd);
140 if (!error) {
error = do_revalidate(nd.dentry);
142 if (!error)
error = cp_old_stat(nd.dentry->d_inode, statbuf);
path_release(&nd);
}
146 return error;
}
#endif
150 asmlinkage long sys_newstat(char * filename, struct stat * statbuf)
{
struct nameidata nd;
int error;
error = user_path_walk(filename, &nd);
156 if (!error) {
error = do_revalidate(nd.dentry);
158 if (!error)
error = cp_new_stat(nd.dentry->d_inode, statbuf);
path_release(&nd);
}
162 return error;
}
#if !defined(__alpha__) && !defined(__sparc__) && !defined(__ia64__) && !defined(__s390__) && !defined(__hppa__)
/*
* For backward compatibility? Maybe this should be moved
* into arch/i386 instead?
*/
171 asmlinkage long sys_lstat(char * filename, struct __old_kernel_stat * statbuf)
{
struct nameidata nd;
int error;
error = user_path_walk_link(filename, &nd);
177 if (!error) {
error = do_revalidate(nd.dentry);
179 if (!error)
error = cp_old_stat(nd.dentry->d_inode, statbuf);
path_release(&nd);
}
183 return error;
}
#endif
188 asmlinkage long sys_newlstat(char * filename, struct stat * statbuf)
{
struct nameidata nd;
int error;
error = user_path_walk_link(filename, &nd);
194 if (!error) {
error = do_revalidate(nd.dentry);
196 if (!error)
error = cp_new_stat(nd.dentry->d_inode, statbuf);
path_release(&nd);
}
200 return error;
}
#if !defined(__alpha__) && !defined(__sparc__) && !defined(__ia64__) && !defined(__s390__) && !defined(__hppa__)
/*
* For backward compatibility? Maybe this should be moved
* into arch/i386 instead?
*/
209 asmlinkage long sys_fstat(unsigned int fd, struct __old_kernel_stat * statbuf)
{
struct file * f;
int err = -EBADF;
f = fget(fd);
215 if (f) {
struct dentry * dentry = f->f_dentry;
err = do_revalidate(dentry);
219 if (!err)
err = cp_old_stat(dentry->d_inode, statbuf);
fput(f);
}
223 return err;
}
#endif
228 asmlinkage long sys_newfstat(unsigned int fd, struct stat * statbuf)
{
struct file * f;
int err = -EBADF;
f = fget(fd);
234 if (f) {
struct dentry * dentry = f->f_dentry;
err = do_revalidate(dentry);
238 if (!err)
err = cp_new_stat(dentry->d_inode, statbuf);
fput(f);
}
242 return err;
}
245 asmlinkage long sys_readlink(const char * path, char * buf, int bufsiz)
{
struct nameidata nd;
int error;
250 if (bufsiz <= 0)
251 return -EINVAL;
error = user_path_walk_link(path, &nd);
254 if (!error) {
struct inode * inode = nd.dentry->d_inode;
error = -EINVAL;
if (inode->i_op && inode->i_op->readlink &&
259 !(error = do_revalidate(nd.dentry))) {
UPDATE_ATIME(inode);
error = inode->i_op->readlink(nd.dentry, buf, bufsiz);
}
path_release(&nd);
}
265 return error;
}
/* ---------- LFS-64 ----------- */
#if !defined(__alpha__) && !defined (__ia64__) && !defined(__mips64)
272 static long cp_new_stat64(struct inode * inode, struct stat64 * statbuf)
{
struct stat64 tmp;
unsigned int blocks, indirect;
memset(&tmp, 0, sizeof(tmp));
tmp.st_dev = kdev_t_to_nr(inode->i_dev);
tmp.st_ino = inode->i_ino;
#ifdef STAT64_HAS_BROKEN_ST_INO
tmp.__st_ino = inode->i_ino;
#endif
tmp.st_mode = inode->i_mode;
tmp.st_nlink = inode->i_nlink;
tmp.st_uid = inode->i_uid;
tmp.st_gid = inode->i_gid;
tmp.st_rdev = kdev_t_to_nr(inode->i_rdev);
tmp.st_atime = inode->i_atime;
tmp.st_mtime = inode->i_mtime;
tmp.st_ctime = inode->i_ctime;
tmp.st_size = inode->i_size;
/*
* st_blocks and st_blksize are approximated with a simple algorithm if
* they aren't supported directly by the filesystem. The minix and msdos
* filesystems don't keep track of blocks, so they would either have to
* be counted explicitly (by delving into the file itself), or by using
* this simple algorithm to get a reasonable (although not 100% accurate)
* value.
*/
/*
* Use minix fs values for the number of direct and indirect blocks. The
* count is now exact for the minix fs except that it counts zero blocks.
* Everything is in units of BLOCK_SIZE until the assignment to
* tmp.st_blksize.
*/
#define D_B 7
#define I_B (BLOCK_SIZE / sizeof(unsigned short))
310 if (!inode->i_blksize) {
blocks = (tmp.st_size + BLOCK_SIZE - 1) >> BLOCK_SIZE_BITS;
312 if (blocks > D_B) {
indirect = (blocks - D_B + I_B - 1) / I_B;
blocks += indirect;
315 if (indirect > 1) {
indirect = (indirect - 1 + I_B - 1) / I_B;
blocks += indirect;
318 if (indirect > 1)
blocks++;
}
}
tmp.st_blocks = (BLOCK_SIZE / 512) * blocks;
tmp.st_blksize = BLOCK_SIZE;
324 } else {
tmp.st_blocks = inode->i_blocks;
tmp.st_blksize = inode->i_blksize;
}
328 return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
}
331 asmlinkage long sys_stat64(char * filename, struct stat64 * statbuf, long flags)
{
struct nameidata nd;
int error;
error = user_path_walk(filename, &nd);
337 if (!error) {
error = do_revalidate(nd.dentry);
339 if (!error)
error = cp_new_stat64(nd.dentry->d_inode, statbuf);
path_release(&nd);
}
343 return error;
}
346 asmlinkage long sys_lstat64(char * filename, struct stat64 * statbuf, long flags)
{
struct nameidata nd;
int error;
error = user_path_walk_link(filename, &nd);
352 if (!error) {
error = do_revalidate(nd.dentry);
354 if (!error)
error = cp_new_stat64(nd.dentry->d_inode, statbuf);
path_release(&nd);
}
358 return error;
}
361 asmlinkage long sys_fstat64(unsigned long fd, struct stat64 * statbuf, long flags)
{
struct file * f;
int err = -EBADF;
f = fget(fd);
367 if (f) {
struct dentry * dentry = f->f_dentry;
err = do_revalidate(dentry);
371 if (!err)
err = cp_new_stat64(dentry->d_inode, statbuf);
fput(f);
}
375 return err;
}
#endif /* LFS-64 */