[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/highuid.h>
#include <linux/fs.h>
#include <linux/namei.h>
#include <linux/security.h>
#include <linux/syscalls.h>
#include <linux/pagemap.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 = (1 << inode->i_blkbits);
}

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);
	return 0;
}

EXPORT_SYMBOL(vfs_getattr);

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

	error = user_path_at(dfd, name, LOOKUP_FOLLOW, &path);
	if (!error) {
		error = vfs_getattr(path.mnt, path.dentry, stat);
		path_put(&path);
	}
	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 path path;
	int error;

	error = user_path_at(dfd, name, 0, &path);
	if (!error) {
		error = vfs_getattr(path.mnt, path.dentry, stat);
		path_put(&path);
	}
	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_path.mnt, f->f_path.dentry, stat);
		fput(f);
	}
	return error;
}

EXPORT_SYMBOL(vfs_fstat);

int vfs_fstatat(int dfd, char __user *filename, struct kstat *stat, int flag)
{
	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);
out:
	return error;
}

EXPORT_SYMBOL(vfs_fstatat);


#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;
	if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
		return -EOVERFLOW;
	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;
}

SYSCALL_DEFINE2(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;
}

SYSCALL_DEFINE2(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;
}

SYSCALL_DEFINE2(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;
	if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
		return -EOVERFLOW;
	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;
}

SYSCALL_DEFINE2(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;
}

SYSCALL_DEFINE2(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)
SYSCALL_DEFINE4(newfstatat, int, dfd, char __user *, filename,
		struct stat __user *, statbuf, int, flag)
{
	struct kstat stat;
	int error;

	error = vfs_fstatat(dfd, filename, &stat, flag);
	if (error)
		return error;
	return cp_new_stat(&stat, statbuf);
}
#endif

SYSCALL_DEFINE2(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;
}

SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname,
		char __user *, buf, int, bufsiz)
{
	struct path path;
	int error;

	if (bufsiz <= 0)
		return -EINVAL;

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

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

SYSCALL_DEFINE3(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;
	if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
		return -EOVERFLOW;
#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;
}

SYSCALL_DEFINE2(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;
}

SYSCALL_DEFINE2(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;
}

SYSCALL_DEFINE2(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;
}

SYSCALL_DEFINE4(fstatat64, int, dfd, char __user *, filename,
		struct stat64 __user *, statbuf, int, flag)
{
	struct kstat stat;
	int error;

	error = vfs_fstatat(dfd, filename, &stat, flag);
	if (error)
		return error;
	return cp_new_stat64(&stat, statbuf);
}
#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>
1da177e4 LT	11	#include <linux/highuid.h>
	12	#include <linux/fs.h>
	13	#include <linux/namei.h>
	14	#include <linux/security.h>
	15	#include <linux/syscalls.h>
ba52de12	16	#include <linux/pagemap.h>
1da177e4 LT	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;
ba52de12	35	stat->blksize = (1 << inode->i_blkbits);
1da177e4 LT	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);
1da177e4 LT	53	return 0;
	54	}
	55
	56	EXPORT_SYMBOL(vfs_getattr);
	57
5590ff0d	58	int vfs_stat_fd(int dfd, char __user name, struct kstat stat)
1da177e4	59	{
2d8f3038	60	struct path path;
1da177e4 LT	61	int error;
1da177e4 LT	62
2d8f3038	63	error = user_path_at(dfd, name, LOOKUP_FOLLOW, &path);
1da177e4	64	if (!error) {
2d8f3038 AV	65	error = vfs_getattr(path.mnt, path.dentry, stat);
2d8f3038 AV	66	path_put(&path);
1da177e4 LT	67	}
	68	return error;
	69	}
	70
5590ff0d UD	71	int vfs_stat(char __user name, struct kstat stat)
	72	{
	73	return vfs_stat_fd(AT_FDCWD, name, stat);
	74	}
	75
1da177e4 LT	76	EXPORT_SYMBOL(vfs_stat);
1da177e4 LT	77
5590ff0d	78	int vfs_lstat_fd(int dfd, char __user name, struct kstat stat)
1da177e4	79	{
2d8f3038	80	struct path path;
1da177e4 LT	81	int error;
1da177e4 LT	82
2d8f3038	83	error = user_path_at(dfd, name, 0, &path);
1da177e4	84	if (!error) {
2d8f3038 AV	85	error = vfs_getattr(path.mnt, path.dentry, stat);
2d8f3038 AV	86	path_put(&path);
1da177e4 LT	87	}
	88	return error;
	89	}
	90
5590ff0d UD	91	int vfs_lstat(char __user name, struct kstat stat)
	92	{
	93	return vfs_lstat_fd(AT_FDCWD, name, stat);
	94	}
	95
1da177e4 LT	96	EXPORT_SYMBOL(vfs_lstat);
	97
	98	int vfs_fstat(unsigned int fd, struct kstat *stat)
	99	{
	100	struct file *f = fget(fd);
	101	int error = -EBADF;
	102
	103	if (f) {
0f7fc9e4	104	error = vfs_getattr(f->f_path.mnt, f->f_path.dentry, stat);
1da177e4 LT	105	fput(f);
	106	}
	107	return error;
	108	}
	109
	110	EXPORT_SYMBOL(vfs_fstat);
	111
0112fc22 OD	112	int vfs_fstatat(int dfd, char __user filename, struct kstat stat, int flag)
	113	{
	114	int error = -EINVAL;
	115
	116	if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
	117	goto out;
	118
	119	if (flag & AT_SYMLINK_NOFOLLOW)
	120	error = vfs_lstat_fd(dfd, filename, stat);
	121	else
	122	error = vfs_stat_fd(dfd, filename, stat);
	123	out:
	124	return error;
	125	}
	126
	127	EXPORT_SYMBOL(vfs_fstatat);
	128
	129
1da177e4 LT	130	#ifdef __ARCH_WANT_OLD_STAT
	131
	132	/*
	133	* For backward compatibility? Maybe this should be moved
	134	* into arch/i386 instead?
	135	*/
	136	static int cp_old_stat(struct kstat stat, struct __old_kernel_stat __user statbuf)
	137	{
	138	static int warncount = 5;
	139	struct __old_kernel_stat tmp;
	140
	141	if (warncount > 0) {
	142	warncount--;
	143	printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n",
	144	current->comm);
	145	} else if (warncount < 0) {
	146	/* it's laughable, but... */
	147	warncount = 0;
	148	}
	149
	150	memset(&tmp, 0, sizeof(struct __old_kernel_stat));
	151	tmp.st_dev = old_encode_dev(stat->dev);
	152	tmp.st_ino = stat->ino;
afefdbb2 DH	153	if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
afefdbb2 DH	154	return -EOVERFLOW;
1da177e4 LT	155	tmp.st_mode = stat->mode;
	156	tmp.st_nlink = stat->nlink;
	157	if (tmp.st_nlink != stat->nlink)
	158	return -EOVERFLOW;
	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)
	164	return -EOVERFLOW;
	165	#endif
	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;
	171	}
	172
bdc480e3	173	SYSCALL_DEFINE2(stat, char __user , filename, struct __old_kernel_stat __user , statbuf)
1da177e4 LT	174	{
1da177e4 LT	175	struct kstat stat;
5590ff0d	176	int error = vfs_stat_fd(AT_FDCWD, filename, &stat);
1da177e4 LT	177
	178	if (!error)
	179	error = cp_old_stat(&stat, statbuf);
	180
	181	return error;
	182	}
257ac264 HC	183
257ac264 HC	184	SYSCALL_DEFINE2(lstat, char __user , filename, struct __old_kernel_stat __user , statbuf)
1da177e4 LT	185	{
1da177e4 LT	186	struct kstat stat;
5590ff0d	187	int error = vfs_lstat_fd(AT_FDCWD, filename, &stat);
1da177e4 LT	188
	189	if (!error)
	190	error = cp_old_stat(&stat, statbuf);
	191
	192	return error;
	193	}
257ac264 HC	194
257ac264 HC	195	SYSCALL_DEFINE2(fstat, unsigned int, fd, struct __old_kernel_stat __user *, statbuf)
1da177e4 LT	196	{
	197	struct kstat stat;
	198	int error = vfs_fstat(fd, &stat);
	199
	200	if (!error)
	201	error = cp_old_stat(&stat, statbuf);
	202
	203	return error;
	204	}
	205
	206	#endif /* __ARCH_WANT_OLD_STAT */
	207
	208	static int cp_new_stat(struct kstat stat, struct stat __user statbuf)
	209	{
	210	struct stat tmp;
	211
	212	#if BITS_PER_LONG == 32
	213	if (!old_valid_dev(stat->dev) \|\| !old_valid_dev(stat->rdev))
	214	return -EOVERFLOW;
	215	#else
	216	if (!new_valid_dev(stat->dev) \|\| !new_valid_dev(stat->rdev))
	217	return -EOVERFLOW;
	218	#endif
	219
	220	memset(&tmp, 0, sizeof(tmp));
	221	#if BITS_PER_LONG == 32
	222	tmp.st_dev = old_encode_dev(stat->dev);
	223	#else
	224	tmp.st_dev = new_encode_dev(stat->dev);
	225	#endif
	226	tmp.st_ino = stat->ino;
afefdbb2 DH	227	if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
afefdbb2 DH	228	return -EOVERFLOW;
1da177e4 LT	229	tmp.st_mode = stat->mode;
	230	tmp.st_nlink = stat->nlink;
	231	if (tmp.st_nlink != stat->nlink)
	232	return -EOVERFLOW;
	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);
	237	#else
	238	tmp.st_rdev = new_encode_dev(stat->rdev);
	239	#endif
	240	#if BITS_PER_LONG == 32
	241	if (stat->size > MAX_NON_LFS)
	242	return -EOVERFLOW;
	243	#endif
	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;
	252	#endif
	253	tmp.st_blocks = stat->blocks;
	254	tmp.st_blksize = stat->blksize;
	255	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
	256	}
	257
257ac264	258	SYSCALL_DEFINE2(newstat, char __user , filename, struct stat __user , statbuf)
5590ff0d UD	259	{
	260	struct kstat stat;
	261	int error = vfs_stat_fd(AT_FDCWD, filename, &stat);
	262
	263	if (!error)
	264	error = cp_new_stat(&stat, statbuf);
	265
	266	return error;
	267	}
	268
257ac264	269	SYSCALL_DEFINE2(newlstat, char __user , filename, struct stat __user , statbuf)
1da177e4 LT	270	{
1da177e4 LT	271	struct kstat stat;
5590ff0d	272	int error = vfs_lstat_fd(AT_FDCWD, filename, &stat);
1da177e4 LT	273
	274	if (!error)
	275	error = cp_new_stat(&stat, statbuf);
	276
	277	return error;
	278	}
5590ff0d	279
2833c28a	280	#if !defined(__ARCH_WANT_STAT64) \|\| defined(__ARCH_WANT_SYS_NEWFSTATAT)
6559eed8 HC	281	SYSCALL_DEFINE4(newfstatat, int, dfd, char __user *, filename,
6559eed8 HC	282	struct stat __user *, statbuf, int, flag)
1da177e4 LT	283	{
1da177e4 LT	284	struct kstat stat;
0112fc22	285	int error;
1da177e4	286
0112fc22 OD	287	error = vfs_fstatat(dfd, filename, &stat, flag);
	288	if (error)
	289	return error;
	290	return cp_new_stat(&stat, statbuf);
1da177e4	291	}
cff2b760	292	#endif
5590ff0d	293
257ac264	294	SYSCALL_DEFINE2(newfstat, unsigned int, fd, struct stat __user *, statbuf)
1da177e4 LT	295	{
	296	struct kstat stat;
	297	int error = vfs_fstat(fd, &stat);
	298
	299	if (!error)
	300	error = cp_new_stat(&stat, statbuf);
	301
	302	return error;
	303	}
	304
6559eed8 HC	305	SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname,
6559eed8 HC	306	char __user *, buf, int, bufsiz)
1da177e4	307	{
2d8f3038	308	struct path path;
1da177e4 LT	309	int error;
	310
	311	if (bufsiz <= 0)
	312	return -EINVAL;
	313
2d8f3038	314	error = user_path_at(dfd, pathname, 0, &path);
1da177e4	315	if (!error) {
2d8f3038	316	struct inode *inode = path.dentry->d_inode;
1da177e4 LT	317
1da177e4 LT	318	error = -EINVAL;
acfa4380	319	if (inode->i_op->readlink) {
2d8f3038	320	error = security_inode_readlink(path.dentry);
1da177e4	321	if (!error) {
2d8f3038 AV	322	touch_atime(path.mnt, path.dentry);
2d8f3038 AV	323	error = inode->i_op->readlink(path.dentry,
4ac91378	324	buf, bufsiz);
1da177e4 LT	325	}
1da177e4 LT	326	}
2d8f3038	327	path_put(&path);
1da177e4 LT	328	}
	329	return error;
	330	}
	331
002c8976 HC	332	SYSCALL_DEFINE3(readlink, const char __user , path, char __user , buf,
002c8976 HC	333	int, bufsiz)
5590ff0d UD	334	{
	335	return sys_readlinkat(AT_FDCWD, path, buf, bufsiz);
	336	}
	337
1da177e4 LT	338
	339	/* ---------- LFS-64 ----------- */
	340	#ifdef __ARCH_WANT_STAT64
	341
	342	static long cp_new_stat64(struct kstat stat, struct stat64 __user statbuf)
	343	{
	344	struct stat64 tmp;
	345
	346	memset(&tmp, 0, sizeof(struct stat64));
	347	#ifdef CONFIG_MIPS
	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))
	350	return -EOVERFLOW;
	351	tmp.st_dev = new_encode_dev(stat->dev);
	352	tmp.st_rdev = new_encode_dev(stat->rdev);
	353	#else
	354	tmp.st_dev = huge_encode_dev(stat->dev);
	355	tmp.st_rdev = huge_encode_dev(stat->rdev);
	356	#endif
	357	tmp.st_ino = stat->ino;
afefdbb2 DH	358	if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
afefdbb2 DH	359	return -EOVERFLOW;
1da177e4 LT	360	#ifdef STAT64_HAS_BROKEN_ST_INO
	361	tmp.__st_ino = stat->ino;
	362	#endif
	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;
	377	}
	378
257ac264	379	SYSCALL_DEFINE2(stat64, char __user , filename, struct stat64 __user , statbuf)
1da177e4 LT	380	{
	381	struct kstat stat;
	382	int error = vfs_stat(filename, &stat);
	383
	384	if (!error)
	385	error = cp_new_stat64(&stat, statbuf);
	386
	387	return error;
	388	}
257ac264 HC	389
257ac264 HC	390	SYSCALL_DEFINE2(lstat64, char __user , filename, struct stat64 __user , statbuf)
1da177e4 LT	391	{
	392	struct kstat stat;
	393	int error = vfs_lstat(filename, &stat);
	394
	395	if (!error)
	396	error = cp_new_stat64(&stat, statbuf);
	397
	398	return error;
	399	}
257ac264 HC	400
257ac264 HC	401	SYSCALL_DEFINE2(fstat64, unsigned long, fd, struct stat64 __user *, statbuf)
1da177e4 LT	402	{
	403	struct kstat stat;
	404	int error = vfs_fstat(fd, &stat);
	405
	406	if (!error)
	407	error = cp_new_stat64(&stat, statbuf);
	408
	409	return error;
	410	}
	411
6559eed8 HC	412	SYSCALL_DEFINE4(fstatat64, int, dfd, char __user *, filename,
6559eed8 HC	413	struct stat64 __user *, statbuf, int, flag)
cff2b760 UD	414	{
cff2b760 UD	415	struct kstat stat;
0112fc22	416	int error;
cff2b760	417
0112fc22 OD	418	error = vfs_fstatat(dfd, filename, &stat, flag);
	419	if (error)
	420	return error;
	421	return cp_new_stat64(&stat, statbuf);
cff2b760	422	}
1da177e4 LT	423	#endif /* __ARCH_WANT_STAT64 */
	424
	425	void inode_add_bytes(struct inode *inode, loff_t bytes)
	426	{
	427	spin_lock(&inode->i_lock);
	428	inode->i_blocks += bytes >> 9;
	429	bytes &= 511;
	430	inode->i_bytes += bytes;
	431	if (inode->i_bytes >= 512) {
	432	inode->i_blocks++;
	433	inode->i_bytes -= 512;
	434	}
	435	spin_unlock(&inode->i_lock);
	436	}
	437
	438	EXPORT_SYMBOL(inode_add_bytes);
	439
	440	void inode_sub_bytes(struct inode *inode, loff_t bytes)
	441	{
	442	spin_lock(&inode->i_lock);
	443	inode->i_blocks -= bytes >> 9;
	444	bytes &= 511;
	445	if (inode->i_bytes < bytes) {
	446	inode->i_blocks--;
	447	inode->i_bytes += 512;
	448	}
	449	inode->i_bytes -= bytes;
	450	spin_unlock(&inode->i_lock);
	451	}
	452
	453	EXPORT_SYMBOL(inode_sub_bytes);
	454
	455	loff_t inode_get_bytes(struct inode *inode)
	456	{
	457	loff_t ret;
	458
	459	spin_lock(&inode->i_lock);
	460	ret = (((loff_t)inode->i_blocks) << 9) + inode->i_bytes;
	461	spin_unlock(&inode->i_lock);
	462	return ret;
	463	}
	464
	465	EXPORT_SYMBOL(inode_get_bytes);
	466
	467	void inode_set_bytes(struct inode *inode, loff_t bytes)
	468	{
	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;
	473	}
	474
	475	EXPORT_SYMBOL(inode_set_bytes);