[net-next-2.6.git] / fs / stat.c

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

#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);
Commit	Line	Data
1da177e4 LT	1	/*
	2	* linux/fs/stat.c
	3	*
	4	* Copyright (C) 1991, 1992 Linus Torvalds
	5	*/
	6
1da177e4 LT	7	#include <linux/module.h>
	8	#include <linux/mm.h>
	9	#include <linux/errno.h>
	10	#include <linux/file.h>
	11	#include <linux/smp_lock.h>
	12	#include <linux/highuid.h>
	13	#include <linux/fs.h>
	14	#include <linux/namei.h>
	15	#include <linux/security.h>
	16	#include <linux/syscalls.h>
	17
	18	#include <asm/uaccess.h>
	19	#include <asm/unistd.h>
	20
	21	void generic_fillattr(struct inode inode, struct kstat stat)
	22	{
	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 = inode->i_blksize;
	36	}
	37
	38	EXPORT_SYMBOL(generic_fillattr);
	39
	40	int vfs_getattr(struct vfsmount mnt, struct dentry dentry, struct kstat *stat)
	41	{
	42	struct inode *inode = dentry->d_inode;
	43	int retval;
	44
	45	retval = security_inode_getattr(mnt, dentry);
	46	if (retval)
	47	return retval;
	48
	49	if (inode->i_op->getattr)
	50	return inode->i_op->getattr(mnt, dentry, stat);
	51
	52	generic_fillattr(inode, stat);
	53	if (!stat->blksize) {
	54	struct super_block *s = inode->i_sb;
	55	unsigned blocks;
	56	blocks = (stat->size+s->s_blocksize-1) >> s->s_blocksize_bits;
	57	stat->blocks = (s->s_blocksize / 512) * blocks;
	58	stat->blksize = s->s_blocksize;
	59	}
	60	return 0;
	61	}
	62
	63	EXPORT_SYMBOL(vfs_getattr);
	64
5590ff0d	65	int vfs_stat_fd(int dfd, char __user name, struct kstat stat)
1da177e4 LT	66	{
	67	struct nameidata nd;
	68	int error;
	69
5590ff0d	70	error = __user_walk_fd(dfd, name, LOOKUP_FOLLOW, &nd);
1da177e4 LT	71	if (!error) {
	72	error = vfs_getattr(nd.mnt, nd.dentry, stat);
	73	path_release(&nd);
	74	}
	75	return error;
	76	}
	77
5590ff0d UD	78	int vfs_stat(char __user name, struct kstat stat)
	79	{
	80	return vfs_stat_fd(AT_FDCWD, name, stat);
	81	}
	82
1da177e4 LT	83	EXPORT_SYMBOL(vfs_stat);
1da177e4 LT	84
5590ff0d	85	int vfs_lstat_fd(int dfd, char __user name, struct kstat stat)
1da177e4 LT	86	{
	87	struct nameidata nd;
	88	int error;
	89
5590ff0d	90	error = __user_walk_fd(dfd, name, 0, &nd);
1da177e4 LT	91	if (!error) {
	92	error = vfs_getattr(nd.mnt, nd.dentry, stat);
	93	path_release(&nd);
	94	}
	95	return error;
	96	}
	97
5590ff0d UD	98	int vfs_lstat(char __user name, struct kstat stat)
	99	{
	100	return vfs_lstat_fd(AT_FDCWD, name, stat);
	101	}
	102
1da177e4 LT	103	EXPORT_SYMBOL(vfs_lstat);
	104
	105	int vfs_fstat(unsigned int fd, struct kstat *stat)
	106	{
	107	struct file *f = fget(fd);
	108	int error = -EBADF;
	109
	110	if (f) {
	111	error = vfs_getattr(f->f_vfsmnt, f->f_dentry, stat);
	112	fput(f);
	113	}
	114	return error;
	115	}
	116
	117	EXPORT_SYMBOL(vfs_fstat);
	118
	119	#ifdef __ARCH_WANT_OLD_STAT
	120
	121	/*
	122	* For backward compatibility? Maybe this should be moved
	123	* into arch/i386 instead?
	124	*/
	125	static int cp_old_stat(struct kstat stat, struct __old_kernel_stat __user statbuf)
	126	{
	127	static int warncount = 5;
	128	struct __old_kernel_stat tmp;
	129
	130	if (warncount > 0) {
	131	warncount--;
	132	printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n",
	133	current->comm);
	134	} else if (warncount < 0) {
	135	/* it's laughable, but... */
	136	warncount = 0;
	137	}
	138
	139	memset(&tmp, 0, sizeof(struct __old_kernel_stat));
	140	tmp.st_dev = old_encode_dev(stat->dev);
	141	tmp.st_ino = stat->ino;
	142	tmp.st_mode = stat->mode;
	143	tmp.st_nlink = stat->nlink;
	144	if (tmp.st_nlink != stat->nlink)
	145	return -EOVERFLOW;
	146	SET_UID(tmp.st_uid, stat->uid);
	147	SET_GID(tmp.st_gid, stat->gid);
	148	tmp.st_rdev = old_encode_dev(stat->rdev);
	149	#if BITS_PER_LONG == 32
	150	if (stat->size > MAX_NON_LFS)
	151	return -EOVERFLOW;
	152	#endif
	153	tmp.st_size = stat->size;
	154	tmp.st_atime = stat->atime.tv_sec;
	155	tmp.st_mtime = stat->mtime.tv_sec;
	156	tmp.st_ctime = stat->ctime.tv_sec;
	157	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
	158	}
	159
	160	asmlinkage long sys_stat(char __user * filename, struct __old_kernel_stat __user * statbuf)
	161	{
	162	struct kstat stat;
5590ff0d	163	int error = vfs_stat_fd(AT_FDCWD, filename, &stat);
1da177e4 LT	164
	165	if (!error)
	166	error = cp_old_stat(&stat, statbuf);
	167
	168	return error;
	169	}
	170	asmlinkage long sys_lstat(char __user * filename, struct __old_kernel_stat __user * statbuf)
	171	{
	172	struct kstat stat;
5590ff0d	173	int error = vfs_lstat_fd(AT_FDCWD, filename, &stat);
1da177e4 LT	174
	175	if (!error)
	176	error = cp_old_stat(&stat, statbuf);
	177
	178	return error;
	179	}
	180	asmlinkage long sys_fstat(unsigned int fd, struct __old_kernel_stat __user * statbuf)
	181	{
	182	struct kstat stat;
	183	int error = vfs_fstat(fd, &stat);
	184
	185	if (!error)
	186	error = cp_old_stat(&stat, statbuf);
	187
	188	return error;
	189	}
	190
	191	#endif /* __ARCH_WANT_OLD_STAT */
	192
	193	static int cp_new_stat(struct kstat stat, struct stat __user statbuf)
	194	{
	195	struct stat tmp;
	196
	197	#if BITS_PER_LONG == 32
	198	if (!old_valid_dev(stat->dev) \|\| !old_valid_dev(stat->rdev))
	199	return -EOVERFLOW;
	200	#else
	201	if (!new_valid_dev(stat->dev) \|\| !new_valid_dev(stat->rdev))
	202	return -EOVERFLOW;
	203	#endif
	204
	205	memset(&tmp, 0, sizeof(tmp));
	206	#if BITS_PER_LONG == 32
	207	tmp.st_dev = old_encode_dev(stat->dev);
	208	#else
	209	tmp.st_dev = new_encode_dev(stat->dev);
	210	#endif
	211	tmp.st_ino = stat->ino;
	212	tmp.st_mode = stat->mode;
	213	tmp.st_nlink = stat->nlink;
	214	if (tmp.st_nlink != stat->nlink)
	215	return -EOVERFLOW;
	216	SET_UID(tmp.st_uid, stat->uid);
	217	SET_GID(tmp.st_gid, stat->gid);
	218	#if BITS_PER_LONG == 32
	219	tmp.st_rdev = old_encode_dev(stat->rdev);
	220	#else
	221	tmp.st_rdev = new_encode_dev(stat->rdev);
	222	#endif
	223	#if BITS_PER_LONG == 32
	224	if (stat->size > MAX_NON_LFS)
	225	return -EOVERFLOW;
	226	#endif
	227	tmp.st_size = stat->size;
	228	tmp.st_atime = stat->atime.tv_sec;
	229	tmp.st_mtime = stat->mtime.tv_sec;
	230	tmp.st_ctime = stat->ctime.tv_sec;
	231	#ifdef STAT_HAVE_NSEC
	232	tmp.st_atime_nsec = stat->atime.tv_nsec;
	233	tmp.st_mtime_nsec = stat->mtime.tv_nsec;
	234	tmp.st_ctime_nsec = stat->ctime.tv_nsec;
	235	#endif
	236	tmp.st_blocks = stat->blocks;
	237	tmp.st_blksize = stat->blksize;
238	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
239	}
240
5590ff0d UD	241	asmlinkage long sys_newstat(char __user filename, struct stat __user statbuf)
	242	{
	243	struct kstat stat;
	244	int error = vfs_stat_fd(AT_FDCWD, filename, &stat);
	245
	246	if (!error)
	247	error = cp_new_stat(&stat, statbuf);
	248
	249	return error;
	250	}
	251
	252	asmlinkage long sys_newlstat(char __user filename, struct stat __user statbuf)
1da177e4 LT	253	{
1da177e4 LT	254	struct kstat stat;
5590ff0d	255	int error = vfs_lstat_fd(AT_FDCWD, filename, &stat);
1da177e4 LT	256
	257	if (!error)
	258	error = cp_new_stat(&stat, statbuf);
	259
	260	return error;
	261	}
5590ff0d	262
2833c28a	263	#if !defined(__ARCH_WANT_STAT64) \|\| defined(__ARCH_WANT_SYS_NEWFSTATAT)
5590ff0d UD	264	asmlinkage long sys_newfstatat(int dfd, char __user *filename,
5590ff0d UD	265	struct stat __user *statbuf, int flag)
1da177e4 LT	266	{
1da177e4 LT	267	struct kstat stat;
5590ff0d UD	268	int error = -EINVAL;
	269
	270	if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
	271	goto out;
	272
	273	if (flag & AT_SYMLINK_NOFOLLOW)
	274	error = vfs_lstat_fd(dfd, filename, &stat);
	275	else
	276	error = vfs_stat_fd(dfd, filename, &stat);
1da177e4 LT	277
	278	if (!error)
	279	error = cp_new_stat(&stat, statbuf);
	280
5590ff0d	281	out:
1da177e4 LT	282	return error;
1da177e4 LT	283	}
cff2b760	284	#endif
5590ff0d UD	285
5590ff0d UD	286	asmlinkage long sys_newfstat(unsigned int fd, struct stat __user *statbuf)
1da177e4 LT	287	{
	288	struct kstat stat;
	289	int error = vfs_fstat(fd, &stat);
	290
	291	if (!error)
	292	error = cp_new_stat(&stat, statbuf);
	293
	294	return error;
	295	}
	296
5590ff0d UD	297	asmlinkage long sys_readlinkat(int dfd, const char __user *path,
5590ff0d UD	298	char __user *buf, int bufsiz)
1da177e4 LT	299	{
	300	struct nameidata nd;
	301	int error;
	302
	303	if (bufsiz <= 0)
	304	return -EINVAL;
	305
5590ff0d	306	error = __user_walk_fd(dfd, path, 0, &nd);
1da177e4 LT	307	if (!error) {
	308	struct inode * inode = nd.dentry->d_inode;
	309
	310	error = -EINVAL;
	311	if (inode->i_op && inode->i_op->readlink) {
	312	error = security_inode_readlink(nd.dentry);
	313	if (!error) {
	314	touch_atime(nd.mnt, nd.dentry);
	315	error = inode->i_op->readlink(nd.dentry, buf, bufsiz);
	316	}
	317	}
	318	path_release(&nd);
	319	}
	320	return error;
	321	}
	322
5590ff0d UD	323	asmlinkage long sys_readlink(const char __user path, char __user buf,
	324	int bufsiz)
	325	{
	326	return sys_readlinkat(AT_FDCWD, path, buf, bufsiz);
	327	}
	328
1da177e4 LT	329
	330	/* ---------- LFS-64 ----------- */
	331	#ifdef __ARCH_WANT_STAT64
	332
	333	static long cp_new_stat64(struct kstat stat, struct stat64 __user statbuf)
	334	{
	335	struct stat64 tmp;
	336
	337	memset(&tmp, 0, sizeof(struct stat64));
	338	#ifdef CONFIG_MIPS
	339	/* mips has weird padding, so we don't get 64 bits there */
	340	if (!new_valid_dev(stat->dev) \|\| !new_valid_dev(stat->rdev))
	341	return -EOVERFLOW;
	342	tmp.st_dev = new_encode_dev(stat->dev);
	343	tmp.st_rdev = new_encode_dev(stat->rdev);
	344	#else
	345	tmp.st_dev = huge_encode_dev(stat->dev);
	346	tmp.st_rdev = huge_encode_dev(stat->rdev);
	347	#endif
	348	tmp.st_ino = stat->ino;
	349	#ifdef STAT64_HAS_BROKEN_ST_INO
	350	tmp.__st_ino = stat->ino;
	351	#endif
	352	tmp.st_mode = stat->mode;
	353	tmp.st_nlink = stat->nlink;
	354	tmp.st_uid = stat->uid;
	355	tmp.st_gid = stat->gid;
	356	tmp.st_atime = stat->atime.tv_sec;
	357	tmp.st_atime_nsec = stat->atime.tv_nsec;
	358	tmp.st_mtime = stat->mtime.tv_sec;
	359	tmp.st_mtime_nsec = stat->mtime.tv_nsec;
	360	tmp.st_ctime = stat->ctime.tv_sec;
	361	tmp.st_ctime_nsec = stat->ctime.tv_nsec;
	362	tmp.st_size = stat->size;
	363	tmp.st_blocks = stat->blocks;
	364	tmp.st_blksize = stat->blksize;
	365	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
	366	}
	367
	368	asmlinkage long sys_stat64(char __user * filename, struct stat64 __user * statbuf)
	369	{
	370	struct kstat stat;
	371	int error = vfs_stat(filename, &stat);
	372
	373	if (!error)
	374	error = cp_new_stat64(&stat, statbuf);
	375
	376	return error;
	377	}
	378	asmlinkage long sys_lstat64(char __user * filename, struct stat64 __user * statbuf)
	379	{
	380	struct kstat stat;
	381	int error = vfs_lstat(filename, &stat);
	382
	383	if (!error)
	384	error = cp_new_stat64(&stat, statbuf);
	385
	386	return error;
	387	}
	388	asmlinkage long sys_fstat64(unsigned long fd, struct stat64 __user * statbuf)
	389	{
	390	struct kstat stat;
	391	int error = vfs_fstat(fd, &stat);
	392
393	if (!error)
394	error = cp_new_stat64(&stat, statbuf);
395
396	return error;
397	}
398
cff2b760 UD	399	asmlinkage long sys_fstatat64(int dfd, char __user *filename,
	400	struct stat64 __user *statbuf, int flag)
	401	{
	402	struct kstat stat;
	403	int error = -EINVAL;
	404
	405	if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
	406	goto out;
	407
	408	if (flag & AT_SYMLINK_NOFOLLOW)
	409	error = vfs_lstat_fd(dfd, filename, &stat);
	410	else
	411	error = vfs_stat_fd(dfd, filename, &stat);
	412
	413	if (!error)
	414	error = cp_new_stat64(&stat, statbuf);
	415
	416	out:
	417	return error;
	418	}
1da177e4 LT	419	#endif /* __ARCH_WANT_STAT64 */
	420
	421	void inode_add_bytes(struct inode *inode, loff_t bytes)
	422	{
	423	spin_lock(&inode->i_lock);
	424	inode->i_blocks += bytes >> 9;
	425	bytes &= 511;
	426	inode->i_bytes += bytes;
	427	if (inode->i_bytes >= 512) {
	428	inode->i_blocks++;
	429	inode->i_bytes -= 512;
	430	}
	431	spin_unlock(&inode->i_lock);
	432	}
	433
	434	EXPORT_SYMBOL(inode_add_bytes);
	435
	436	void inode_sub_bytes(struct inode *inode, loff_t bytes)
	437	{
	438	spin_lock(&inode->i_lock);
	439	inode->i_blocks -= bytes >> 9;
	440	bytes &= 511;
	441	if (inode->i_bytes < bytes) {
	442	inode->i_blocks--;
	443	inode->i_bytes += 512;
	444	}
	445	inode->i_bytes -= bytes;
	446	spin_unlock(&inode->i_lock);
	447	}
	448
	449	EXPORT_SYMBOL(inode_sub_bytes);
	450
	451	loff_t inode_get_bytes(struct inode *inode)
	452	{
	453	loff_t ret;
	454
	455	spin_lock(&inode->i_lock);
	456	ret = (((loff_t)inode->i_blocks) << 9) + inode->i_bytes;
	457	spin_unlock(&inode->i_lock);
	458	return ret;
	459	}
	460
	461	EXPORT_SYMBOL(inode_get_bytes);
	462
	463	void inode_set_bytes(struct inode *inode, loff_t bytes)
	464	{
	465	/* Caller is here responsible for sufficient locking
	466	* (ie. inode->i_lock) */
	467	inode->i_blocks = bytes >> 9;
	468	inode->i_bytes = bytes & 511;
	469	}
	470
	471	EXPORT_SYMBOL(inode_set_bytes);