fs/stat.c - kernel/msm - Gitiles

 /*
  *  linux/fs/stat.c
  *
  *  Copyright (C) 1991, 1992  Linus Torvalds
  */

 #include <linux/config.h>
 #include <linux/module.h>
 #include <linux/mm.h>
 #include <linux/errno.h>
 #include <linux/file.h>
 #include <linux/smp_lock.h>
 #include <linux/highuid.h>
 #include <linux/fs.h>
 #include <linux/namei.h>
 #include <linux/security.h>
 #include <linux/syscalls.h>

 #include <asm/uaccess.h>
 #include <asm/unistd.h>

 void generic_fillattr(struct inode *inode, struct kstat *stat)
 {
 	stat->dev = inode->i_sb->s_dev;
 	stat->ino = inode->i_ino;
 	stat->mode = inode->i_mode;
 	stat->nlink = inode->i_nlink;
 	stat->uid = inode->i_uid;
 	stat->gid = inode->i_gid;
 	stat->rdev = inode->i_rdev;
 	stat->atime = inode->i_atime;
 	stat->mtime = inode->i_mtime;
 	stat->ctime = inode->i_ctime;
 	stat->size = i_size_read(inode);
 	stat->blocks = inode->i_blocks;
 	stat->blksize = inode->i_blksize;
 }

 EXPORT_SYMBOL(generic_fillattr);

 int vfs_getattr(struct vfsmount *mnt, struct dentry *dentry, struct kstat *stat)
 {
 	struct inode *inode = dentry->d_inode;
 	int retval;

 	retval = security_inode_getattr(mnt, dentry);
 	if (retval)
 		return retval;

 	if (inode->i_op->getattr)
 		return inode->i_op->getattr(mnt, dentry, stat);

 	generic_fillattr(inode, stat);
 	if (!stat->blksize) {
 		struct super_block *s = inode->i_sb;
 		unsigned blocks;
 		blocks = (stat->size+s->s_blocksize-1) >> s->s_blocksize_bits;
 		stat->blocks = (s->s_blocksize / 512) * blocks;
 		stat->blksize = s->s_blocksize;
 	}
 	return 0;
 }

 EXPORT_SYMBOL(vfs_getattr);

 int vfs_stat_fd(int dfd, char __user *name, struct kstat *stat)
 {
 	struct nameidata nd;
 	int error;

 	error = __user_walk_fd(dfd, name, LOOKUP_FOLLOW, &nd);
 	if (!error) {
 		error = vfs_getattr(nd.mnt, nd.dentry, stat);
 		path_release(&nd);
 	}
 	return error;
 }

 int vfs_stat(char __user *name, struct kstat *stat)
 {
 	return vfs_stat_fd(AT_FDCWD, name, stat);
 }

 EXPORT_SYMBOL(vfs_stat);

 int vfs_lstat_fd(int dfd, char __user *name, struct kstat *stat)
 {
 	struct nameidata nd;
 	int error;

 	error = __user_walk_fd(dfd, name, 0, &nd);
 	if (!error) {
 		error = vfs_getattr(nd.mnt, nd.dentry, stat);
 		path_release(&nd);
 	}
 	return error;
 }

 int vfs_lstat(char __user *name, struct kstat *stat)
 {
 	return vfs_lstat_fd(AT_FDCWD, name, stat);
 }

 EXPORT_SYMBOL(vfs_lstat);

 int vfs_fstat(unsigned int fd, struct kstat *stat)
 {
 	struct file *f = fget(fd);
 	int error = -EBADF;

 	if (f) {
 		error = vfs_getattr(f->f_vfsmnt, f->f_dentry, stat);
 		fput(f);
 	}
 	return error;
 }

 EXPORT_SYMBOL(vfs_fstat);

 #ifdef __ARCH_WANT_OLD_STAT

 /*
  * For backward compatibility?  Maybe this should be moved
  * into arch/i386 instead?
  */
 static int cp_old_stat(struct kstat *stat, struct __old_kernel_stat __user * statbuf)
 {
 	static int warncount = 5;
 	struct __old_kernel_stat tmp;

 	if (warncount > 0) {
 		warncount--;
 		printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n",
 			current->comm);
 	} else if (warncount < 0) {
 		/* it's laughable, but... */
 		warncount = 0;
 	}

 	memset(&tmp, 0, sizeof(struct __old_kernel_stat));
 	tmp.st_dev = old_encode_dev(stat->dev);
 	tmp.st_ino = stat->ino;
 	tmp.st_mode = stat->mode;
 	tmp.st_nlink = stat->nlink;
 	if (tmp.st_nlink != stat->nlink)
 		return -EOVERFLOW;
 	SET_UID(tmp.st_uid, stat->uid);
 	SET_GID(tmp.st_gid, stat->gid);
 	tmp.st_rdev = old_encode_dev(stat->rdev);
 #if BITS_PER_LONG == 32
 	if (stat->size > MAX_NON_LFS)
 		return -EOVERFLOW;
 #endif
 	tmp.st_size = stat->size;
 	tmp.st_atime = stat->atime.tv_sec;
 	tmp.st_mtime = stat->mtime.tv_sec;
 	tmp.st_ctime = stat->ctime.tv_sec;
 	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
 }

 asmlinkage long sys_stat(char __user * filename, struct __old_kernel_stat __user * statbuf)
 {
 	struct kstat stat;
 	int error = vfs_stat_fd(AT_FDCWD, filename, &stat);

 	if (!error)
 		error = cp_old_stat(&stat, statbuf);

 	return error;
 }
 asmlinkage long sys_lstat(char __user * filename, struct __old_kernel_stat __user * statbuf)
 {
 	struct kstat stat;
 	int error = vfs_lstat_fd(AT_FDCWD, filename, &stat);

 	if (!error)
 		error = cp_old_stat(&stat, statbuf);

 	return error;
 }
 asmlinkage long sys_fstat(unsigned int fd, struct __old_kernel_stat __user * statbuf)
 {
 	struct kstat stat;
 	int error = vfs_fstat(fd, &stat);

 	if (!error)
 		error = cp_old_stat(&stat, statbuf);

 	return error;
 }

 #endif /* __ARCH_WANT_OLD_STAT */

 static int cp_new_stat(struct kstat *stat, struct stat __user *statbuf)
 {
 	struct stat tmp;

 #if BITS_PER_LONG == 32
 	if (!old_valid_dev(stat->dev) || !old_valid_dev(stat->rdev))
 		return -EOVERFLOW;
 #else
 	if (!new_valid_dev(stat->dev) || !new_valid_dev(stat->rdev))
 		return -EOVERFLOW;
 #endif

 	memset(&tmp, 0, sizeof(tmp));
 #if BITS_PER_LONG == 32
 	tmp.st_dev = old_encode_dev(stat->dev);
 #else
 	tmp.st_dev = new_encode_dev(stat->dev);
 #endif
 	tmp.st_ino = stat->ino;
 	tmp.st_mode = stat->mode;
 	tmp.st_nlink = stat->nlink;
 	if (tmp.st_nlink != stat->nlink)
 		return -EOVERFLOW;
 	SET_UID(tmp.st_uid, stat->uid);
 	SET_GID(tmp.st_gid, stat->gid);
 #if BITS_PER_LONG == 32
 	tmp.st_rdev = old_encode_dev(stat->rdev);
 #else
 	tmp.st_rdev = new_encode_dev(stat->rdev);
 #endif
 #if BITS_PER_LONG == 32
 	if (stat->size > MAX_NON_LFS)
 		return -EOVERFLOW;
 #endif
 	tmp.st_size = stat->size;
 	tmp.st_atime = stat->atime.tv_sec;
 	tmp.st_mtime = stat->mtime.tv_sec;
 	tmp.st_ctime = stat->ctime.tv_sec;
 #ifdef STAT_HAVE_NSEC
 	tmp.st_atime_nsec = stat->atime.tv_nsec;
 	tmp.st_mtime_nsec = stat->mtime.tv_nsec;
 	tmp.st_ctime_nsec = stat->ctime.tv_nsec;
 #endif
 	tmp.st_blocks = stat->blocks;
 	tmp.st_blksize = stat->blksize;
 	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
 }

 asmlinkage long sys_newstat(char __user *filename, struct stat __user *statbuf)
 {
 	struct kstat stat;
 	int error = vfs_stat_fd(AT_FDCWD, filename, &stat);

 	if (!error)
 		error = cp_new_stat(&stat, statbuf);

 	return error;
 }

 asmlinkage long sys_newlstat(char __user *filename, struct stat __user *statbuf)
 {
 	struct kstat stat;
 	int error = vfs_lstat_fd(AT_FDCWD, filename, &stat);

 	if (!error)
 		error = cp_new_stat(&stat, statbuf);

 	return error;
 }

 #if !defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_SYS_NEWFSTATAT)
 asmlinkage long sys_newfstatat(int dfd, char __user *filename,
 				struct stat __user *statbuf, int flag)
 {
 	struct kstat stat;
 	int error = -EINVAL;

 	if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
 		goto out;

 	if (flag & AT_SYMLINK_NOFOLLOW)
 		error = vfs_lstat_fd(dfd, filename, &stat);
 	else
 		error = vfs_stat_fd(dfd, filename, &stat);

 	if (!error)
 		error = cp_new_stat(&stat, statbuf);

 out:
 	return error;
 }
 #endif

 asmlinkage long sys_newfstat(unsigned int fd, struct stat __user *statbuf)
 {
 	struct kstat stat;
 	int error = vfs_fstat(fd, &stat);

 	if (!error)
 		error = cp_new_stat(&stat, statbuf);

 	return error;
 }

 asmlinkage long sys_readlinkat(int dfd, const char __user *path,
 				char __user *buf, int bufsiz)
 {
 	struct nameidata nd;
 	int error;

 	if (bufsiz <= 0)
 		return -EINVAL;

 	error = __user_walk_fd(dfd, path, 0, &nd);
 	if (!error) {
 		struct inode * inode = nd.dentry->d_inode;

 		error = -EINVAL;
 		if (inode->i_op && inode->i_op->readlink) {
 			error = security_inode_readlink(nd.dentry);
 			if (!error) {
 				touch_atime(nd.mnt, nd.dentry);
 				error = inode->i_op->readlink(nd.dentry, buf, bufsiz);
 			}
 		}
 		path_release(&nd);
 	}
 	return error;
 }

 asmlinkage long sys_readlink(const char __user *path, char __user *buf,
 				int bufsiz)
 {
 	return sys_readlinkat(AT_FDCWD, path, buf, bufsiz);
 }


 /* ---------- LFS-64 ----------- */
 #ifdef __ARCH_WANT_STAT64

 static long cp_new_stat64(struct kstat *stat, struct stat64 __user *statbuf)
 {
 	struct stat64 tmp;

 	memset(&tmp, 0, sizeof(struct stat64));
 #ifdef CONFIG_MIPS
 	/* mips has weird padding, so we don't get 64 bits there */
 	if (!new_valid_dev(stat->dev) || !new_valid_dev(stat->rdev))
 		return -EOVERFLOW;
 	tmp.st_dev = new_encode_dev(stat->dev);
 	tmp.st_rdev = new_encode_dev(stat->rdev);
 #else
 	tmp.st_dev = huge_encode_dev(stat->dev);
 	tmp.st_rdev = huge_encode_dev(stat->rdev);
 #endif
 	tmp.st_ino = stat->ino;
 #ifdef STAT64_HAS_BROKEN_ST_INO
 	tmp.__st_ino = stat->ino;
 #endif
 	tmp.st_mode = stat->mode;
 	tmp.st_nlink = stat->nlink;
 	tmp.st_uid = stat->uid;
 	tmp.st_gid = stat->gid;
 	tmp.st_atime = stat->atime.tv_sec;
 	tmp.st_atime_nsec = stat->atime.tv_nsec;
 	tmp.st_mtime = stat->mtime.tv_sec;
 	tmp.st_mtime_nsec = stat->mtime.tv_nsec;
 	tmp.st_ctime = stat->ctime.tv_sec;
 	tmp.st_ctime_nsec = stat->ctime.tv_nsec;
 	tmp.st_size = stat->size;
 	tmp.st_blocks = stat->blocks;
 	tmp.st_blksize = stat->blksize;
 	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
 }

 asmlinkage long sys_stat64(char __user * filename, struct stat64 __user * statbuf)
 {
 	struct kstat stat;
 	int error = vfs_stat(filename, &stat);

 	if (!error)
 		error = cp_new_stat64(&stat, statbuf);

 	return error;
 }
 asmlinkage long sys_lstat64(char __user * filename, struct stat64 __user * statbuf)
 {
 	struct kstat stat;
 	int error = vfs_lstat(filename, &stat);

 	if (!error)
 		error = cp_new_stat64(&stat, statbuf);

 	return error;
 }
 asmlinkage long sys_fstat64(unsigned long fd, struct stat64 __user * statbuf)
 {
 	struct kstat stat;
 	int error = vfs_fstat(fd, &stat);

 	if (!error)
 		error = cp_new_stat64(&stat, statbuf);

 	return error;
 }

 asmlinkage long sys_fstatat64(int dfd, char __user *filename,
 			       struct stat64 __user *statbuf, int flag)
 {
 	struct kstat stat;
 	int error = -EINVAL;

 	if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
 		goto out;

 	if (flag & AT_SYMLINK_NOFOLLOW)
 		error = vfs_lstat_fd(dfd, filename, &stat);
 	else
 		error = vfs_stat_fd(dfd, filename, &stat);

 	if (!error)
 		error = cp_new_stat64(&stat, statbuf);

 out:
 	return error;
 }
 #endif /* __ARCH_WANT_STAT64 */

 void inode_add_bytes(struct inode *inode, loff_t bytes)
 {
 	spin_lock(&inode->i_lock);
 	inode->i_blocks += bytes >> 9;
 	bytes &= 511;
 	inode->i_bytes += bytes;
 	if (inode->i_bytes >= 512) {
 		inode->i_blocks++;
 		inode->i_bytes -= 512;
 	}
 	spin_unlock(&inode->i_lock);
 }

 EXPORT_SYMBOL(inode_add_bytes);

 void inode_sub_bytes(struct inode *inode, loff_t bytes)
 {
 	spin_lock(&inode->i_lock);
 	inode->i_blocks -= bytes >> 9;
 	bytes &= 511;
 	if (inode->i_bytes < bytes) {
 		inode->i_blocks--;
 		inode->i_bytes += 512;
 	}
 	inode->i_bytes -= bytes;
 	spin_unlock(&inode->i_lock);
 }

 EXPORT_SYMBOL(inode_sub_bytes);

 loff_t inode_get_bytes(struct inode *inode)
 {
 	loff_t ret;

 	spin_lock(&inode->i_lock);
 	ret = (((loff_t)inode->i_blocks) << 9) + inode->i_bytes;
 	spin_unlock(&inode->i_lock);
 	return ret;
 }

 EXPORT_SYMBOL(inode_get_bytes);

 void inode_set_bytes(struct inode *inode, loff_t bytes)
 {
 	/* Caller is here responsible for sufficient locking
 	 * (ie. inode->i_lock) */
 	inode->i_blocks = bytes >> 9;
 	inode->i_bytes = bytes & 511;
 }

 EXPORT_SYMBOL(inode_set_bytes);
	/*
	* linux/fs/stat.c
	*
	* Copyright (C) 1991, 1992 Linus Torvalds
	*/

	#include <linux/config.h>
	#include <linux/module.h>
	#include <linux/mm.h>
	#include <linux/errno.h>
	#include <linux/file.h>
	#include <linux/smp_lock.h>
	#include <linux/highuid.h>
	#include <linux/fs.h>
	#include <linux/namei.h>
	#include <linux/security.h>
	#include <linux/syscalls.h>

	#include <asm/uaccess.h>
	#include <asm/unistd.h>

	void generic_fillattr(struct inode inode, struct kstat stat)
	{
	stat->dev = inode->i_sb->s_dev;
	stat->ino = inode->i_ino;
	stat->mode = inode->i_mode;
	stat->nlink = inode->i_nlink;
	stat->uid = inode->i_uid;
	stat->gid = inode->i_gid;
	stat->rdev = inode->i_rdev;
	stat->atime = inode->i_atime;
	stat->mtime = inode->i_mtime;
	stat->ctime = inode->i_ctime;
	stat->size = i_size_read(inode);
	stat->blocks = inode->i_blocks;
	stat->blksize = inode->i_blksize;
	}

	EXPORT_SYMBOL(generic_fillattr);

	int vfs_getattr(struct vfsmount mnt, struct dentry dentry, struct kstat *stat)
	{
	struct inode *inode = dentry->d_inode;
	int retval;

	retval = security_inode_getattr(mnt, dentry);
	if (retval)
	return retval;

	if (inode->i_op->getattr)
	return inode->i_op->getattr(mnt, dentry, stat);

	generic_fillattr(inode, stat);
	if (!stat->blksize) {
	struct super_block *s = inode->i_sb;
	unsigned blocks;
	blocks = (stat->size+s->s_blocksize-1) >> s->s_blocksize_bits;
	stat->blocks = (s->s_blocksize / 512) * blocks;
	stat->blksize = s->s_blocksize;
	}
	return 0;
	}

	EXPORT_SYMBOL(vfs_getattr);

	int vfs_stat_fd(int dfd, char __user name, struct kstat stat)
	{
	struct nameidata nd;
	int error;

	error = __user_walk_fd(dfd, name, LOOKUP_FOLLOW, &nd);
	if (!error) {
	error = vfs_getattr(nd.mnt, nd.dentry, stat);
	path_release(&nd);
	}
	return error;
	}

	int vfs_stat(char __user name, struct kstat stat)
	{
	return vfs_stat_fd(AT_FDCWD, name, stat);
	}

	EXPORT_SYMBOL(vfs_stat);

	int vfs_lstat_fd(int dfd, char __user name, struct kstat stat)
	{
	struct nameidata nd;
	int error;

	error = __user_walk_fd(dfd, name, 0, &nd);
	if (!error) {
	error = vfs_getattr(nd.mnt, nd.dentry, stat);
	path_release(&nd);
	}
	return error;
	}

	int vfs_lstat(char __user name, struct kstat stat)
	{
	return vfs_lstat_fd(AT_FDCWD, name, stat);
	}

	EXPORT_SYMBOL(vfs_lstat);

	int vfs_fstat(unsigned int fd, struct kstat *stat)
	{
	struct file *f = fget(fd);
	int error = -EBADF;

	if (f) {
	error = vfs_getattr(f->f_vfsmnt, f->f_dentry, stat);
	fput(f);
	}
	return error;
	}

	EXPORT_SYMBOL(vfs_fstat);

	#ifdef __ARCH_WANT_OLD_STAT

	/*
	* For backward compatibility? Maybe this should be moved
	* into arch/i386 instead?
	*/
	static int cp_old_stat(struct kstat stat, struct __old_kernel_stat __user statbuf)
	{
	static int warncount = 5;
	struct __old_kernel_stat tmp;

	if (warncount > 0) {
	warncount--;
	printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n",
	current->comm);
	} else if (warncount < 0) {
	/* it's laughable, but... */
	warncount = 0;
	}

	memset(&tmp, 0, sizeof(struct __old_kernel_stat));
	tmp.st_dev = old_encode_dev(stat->dev);
	tmp.st_ino = stat->ino;
	tmp.st_mode = stat->mode;
	tmp.st_nlink = stat->nlink;
	if (tmp.st_nlink != stat->nlink)
	return -EOVERFLOW;
	SET_UID(tmp.st_uid, stat->uid);
	SET_GID(tmp.st_gid, stat->gid);
	tmp.st_rdev = old_encode_dev(stat->rdev);
	#if BITS_PER_LONG == 32
	if (stat->size > MAX_NON_LFS)
	return -EOVERFLOW;
	#endif
	tmp.st_size = stat->size;
	tmp.st_atime = stat->atime.tv_sec;
	tmp.st_mtime = stat->mtime.tv_sec;
	tmp.st_ctime = stat->ctime.tv_sec;
	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
	}

	asmlinkage long sys_stat(char __user * filename, struct __old_kernel_stat __user * statbuf)
	{
	struct kstat stat;
	int error = vfs_stat_fd(AT_FDCWD, filename, &stat);

	if (!error)
	error = cp_old_stat(&stat, statbuf);

	return error;
	}
	asmlinkage long sys_lstat(char __user * filename, struct __old_kernel_stat __user * statbuf)
	{
	struct kstat stat;
	int error = vfs_lstat_fd(AT_FDCWD, filename, &stat);

	if (!error)
	error = cp_old_stat(&stat, statbuf);

	return error;
	}
	asmlinkage long sys_fstat(unsigned int fd, struct __old_kernel_stat __user * statbuf)
	{
	struct kstat stat;
	int error = vfs_fstat(fd, &stat);

	if (!error)
	error = cp_old_stat(&stat, statbuf);

	return error;
	}

	#endif /* __ARCH_WANT_OLD_STAT */

	static int cp_new_stat(struct kstat stat, struct stat __user statbuf)
	{
	struct stat tmp;

	#if BITS_PER_LONG == 32
	if (!old_valid_dev(stat->dev) \|\| !old_valid_dev(stat->rdev))
	return -EOVERFLOW;
	#else
	if (!new_valid_dev(stat->dev) \|\| !new_valid_dev(stat->rdev))
	return -EOVERFLOW;
	#endif

	memset(&tmp, 0, sizeof(tmp));
	#if BITS_PER_LONG == 32
	tmp.st_dev = old_encode_dev(stat->dev);
	#else
	tmp.st_dev = new_encode_dev(stat->dev);
	#endif
	tmp.st_ino = stat->ino;
	tmp.st_mode = stat->mode;
	tmp.st_nlink = stat->nlink;
	if (tmp.st_nlink != stat->nlink)
	return -EOVERFLOW;
	SET_UID(tmp.st_uid, stat->uid);
	SET_GID(tmp.st_gid, stat->gid);
	#if BITS_PER_LONG == 32
	tmp.st_rdev = old_encode_dev(stat->rdev);
	#else
	tmp.st_rdev = new_encode_dev(stat->rdev);
	#endif
	#if BITS_PER_LONG == 32
	if (stat->size > MAX_NON_LFS)
	return -EOVERFLOW;
	#endif
	tmp.st_size = stat->size;
	tmp.st_atime = stat->atime.tv_sec;
	tmp.st_mtime = stat->mtime.tv_sec;
	tmp.st_ctime = stat->ctime.tv_sec;
	#ifdef STAT_HAVE_NSEC
	tmp.st_atime_nsec = stat->atime.tv_nsec;
	tmp.st_mtime_nsec = stat->mtime.tv_nsec;
	tmp.st_ctime_nsec = stat->ctime.tv_nsec;
	#endif
	tmp.st_blocks = stat->blocks;
	tmp.st_blksize = stat->blksize;
	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
	}

	asmlinkage long sys_newstat(char __user filename, struct stat __user statbuf)
	{
	struct kstat stat;
	int error = vfs_stat_fd(AT_FDCWD, filename, &stat);

	if (!error)
	error = cp_new_stat(&stat, statbuf);

	return error;
	}

	asmlinkage long sys_newlstat(char __user filename, struct stat __user statbuf)
	{
	struct kstat stat;
	int error = vfs_lstat_fd(AT_FDCWD, filename, &stat);

	if (!error)
	error = cp_new_stat(&stat, statbuf);

	return error;
	}

	#if !defined(__ARCH_WANT_STAT64) \|\| defined(__ARCH_WANT_SYS_NEWFSTATAT)
	asmlinkage long sys_newfstatat(int dfd, char __user *filename,
	struct stat __user *statbuf, int flag)
	{
	struct kstat stat;
	int error = -EINVAL;

	if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
	goto out;

	if (flag & AT_SYMLINK_NOFOLLOW)
	error = vfs_lstat_fd(dfd, filename, &stat);
	else
	error = vfs_stat_fd(dfd, filename, &stat);

	if (!error)
	error = cp_new_stat(&stat, statbuf);

	out:
	return error;
	}
	#endif

	asmlinkage long sys_newfstat(unsigned int fd, struct stat __user *statbuf)
	{
	struct kstat stat;
	int error = vfs_fstat(fd, &stat);

	if (!error)
	error = cp_new_stat(&stat, statbuf);

	return error;
	}

	asmlinkage long sys_readlinkat(int dfd, const char __user *path,
	char __user *buf, int bufsiz)
	{
	struct nameidata nd;
	int error;

	if (bufsiz <= 0)
	return -EINVAL;

	error = __user_walk_fd(dfd, path, 0, &nd);
	if (!error) {
	struct inode * inode = nd.dentry->d_inode;

	error = -EINVAL;
	if (inode->i_op && inode->i_op->readlink) {
	error = security_inode_readlink(nd.dentry);
	if (!error) {
	touch_atime(nd.mnt, nd.dentry);
	error = inode->i_op->readlink(nd.dentry, buf, bufsiz);
	}
	}
	path_release(&nd);
	}
	return error;
	}

	asmlinkage long sys_readlink(const char __user path, char __user buf,
	int bufsiz)
	{
	return sys_readlinkat(AT_FDCWD, path, buf, bufsiz);
	}


	/* ---------- LFS-64 ----------- */
	#ifdef __ARCH_WANT_STAT64

	static long cp_new_stat64(struct kstat stat, struct stat64 __user statbuf)
	{
	struct stat64 tmp;

	memset(&tmp, 0, sizeof(struct stat64));
	#ifdef CONFIG_MIPS
	/* mips has weird padding, so we don't get 64 bits there */
	if (!new_valid_dev(stat->dev) \|\| !new_valid_dev(stat->rdev))
	return -EOVERFLOW;
	tmp.st_dev = new_encode_dev(stat->dev);
	tmp.st_rdev = new_encode_dev(stat->rdev);
	#else
	tmp.st_dev = huge_encode_dev(stat->dev);
	tmp.st_rdev = huge_encode_dev(stat->rdev);
	#endif
	tmp.st_ino = stat->ino;
	#ifdef STAT64_HAS_BROKEN_ST_INO
	tmp.__st_ino = stat->ino;
	#endif
	tmp.st_mode = stat->mode;
	tmp.st_nlink = stat->nlink;
	tmp.st_uid = stat->uid;
	tmp.st_gid = stat->gid;
	tmp.st_atime = stat->atime.tv_sec;
	tmp.st_atime_nsec = stat->atime.tv_nsec;
	tmp.st_mtime = stat->mtime.tv_sec;
	tmp.st_mtime_nsec = stat->mtime.tv_nsec;
	tmp.st_ctime = stat->ctime.tv_sec;
	tmp.st_ctime_nsec = stat->ctime.tv_nsec;
	tmp.st_size = stat->size;
	tmp.st_blocks = stat->blocks;
	tmp.st_blksize = stat->blksize;
	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
	}

	asmlinkage long sys_stat64(char __user * filename, struct stat64 __user * statbuf)
	{
	struct kstat stat;
	int error = vfs_stat(filename, &stat);

	if (!error)
	error = cp_new_stat64(&stat, statbuf);

	return error;
	}
	asmlinkage long sys_lstat64(char __user * filename, struct stat64 __user * statbuf)
	{
	struct kstat stat;
	int error = vfs_lstat(filename, &stat);

	if (!error)
	error = cp_new_stat64(&stat, statbuf);

	return error;
	}
	asmlinkage long sys_fstat64(unsigned long fd, struct stat64 __user * statbuf)
	{
	struct kstat stat;
	int error = vfs_fstat(fd, &stat);

	if (!error)
	error = cp_new_stat64(&stat, statbuf);

	return error;
	}

	asmlinkage long sys_fstatat64(int dfd, char __user *filename,
	struct stat64 __user *statbuf, int flag)
	{
	struct kstat stat;
	int error = -EINVAL;

	if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
	goto out;

	if (flag & AT_SYMLINK_NOFOLLOW)
	error = vfs_lstat_fd(dfd, filename, &stat);
	else
	error = vfs_stat_fd(dfd, filename, &stat);

	if (!error)
	error = cp_new_stat64(&stat, statbuf);

	out:
	return error;
	}
	#endif /* __ARCH_WANT_STAT64 */

	void inode_add_bytes(struct inode *inode, loff_t bytes)
	{
	spin_lock(&inode->i_lock);
	inode->i_blocks += bytes >> 9;
	bytes &= 511;
	inode->i_bytes += bytes;
	if (inode->i_bytes >= 512) {
	inode->i_blocks++;
	inode->i_bytes -= 512;
	}
	spin_unlock(&inode->i_lock);
	}

	EXPORT_SYMBOL(inode_add_bytes);

	void inode_sub_bytes(struct inode *inode, loff_t bytes)
	{
	spin_lock(&inode->i_lock);
	inode->i_blocks -= bytes >> 9;
	bytes &= 511;
	if (inode->i_bytes < bytes) {
	inode->i_blocks--;
	inode->i_bytes += 512;
	}
	inode->i_bytes -= bytes;
	spin_unlock(&inode->i_lock);
	}

	EXPORT_SYMBOL(inode_sub_bytes);

	loff_t inode_get_bytes(struct inode *inode)
	{
	loff_t ret;

	spin_lock(&inode->i_lock);
	ret = (((loff_t)inode->i_blocks) << 9) + inode->i_bytes;
	spin_unlock(&inode->i_lock);
	return ret;
	}

	EXPORT_SYMBOL(inode_get_bytes);

	void inode_set_bytes(struct inode *inode, loff_t bytes)
	{
	/* Caller is here responsible for sufficient locking
	* (ie. inode->i_lock) */
	inode->i_blocks = bytes >> 9;
	inode->i_bytes = bytes & 511;
	}

	EXPORT_SYMBOL(inode_set_bytes);