[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 <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 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;
	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;
}

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;
	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;
}

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;
	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;
}

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>
ba52de12	17	#include <linux/pagemap.h>
1da177e4 LT	18
	19	#include <asm/uaccess.h>
	20	#include <asm/unistd.h>
	21
	22	void generic_fillattr(struct inode inode, struct kstat stat)
	23	{
	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->rdev = inode->i_rdev;
	31	stat->atime = inode->i_atime;
	32	stat->mtime = inode->i_mtime;
	33	stat->ctime = inode->i_ctime;
	34	stat->size = i_size_read(inode);
	35	stat->blocks = inode->i_blocks;
ba52de12	36	stat->blksize = (1 << inode->i_blkbits);
1da177e4 LT	37	}
	38
	39	EXPORT_SYMBOL(generic_fillattr);
	40
	41	int vfs_getattr(struct vfsmount mnt, struct dentry dentry, struct kstat *stat)
	42	{
	43	struct inode *inode = dentry->d_inode;
	44	int retval;
	45
	46	retval = security_inode_getattr(mnt, dentry);
	47	if (retval)
	48	return retval;
	49
	50	if (inode->i_op->getattr)
	51	return inode->i_op->getattr(mnt, dentry, stat);
	52
	53	generic_fillattr(inode, stat);
1da177e4 LT	54	return 0;
	55	}
	56
	57	EXPORT_SYMBOL(vfs_getattr);
	58
5590ff0d	59	int vfs_stat_fd(int dfd, char __user name, struct kstat stat)
1da177e4 LT	60	{
	61	struct nameidata nd;
	62	int error;
	63
5590ff0d	64	error = __user_walk_fd(dfd, name, LOOKUP_FOLLOW, &nd);
1da177e4 LT	65	if (!error) {
	66	error = vfs_getattr(nd.mnt, nd.dentry, stat);
	67	path_release(&nd);
	68	}
	69	return error;
	70	}
	71
5590ff0d UD	72	int vfs_stat(char __user name, struct kstat stat)
	73	{
	74	return vfs_stat_fd(AT_FDCWD, name, stat);
	75	}
	76
1da177e4 LT	77	EXPORT_SYMBOL(vfs_stat);
1da177e4 LT	78
5590ff0d	79	int vfs_lstat_fd(int dfd, char __user name, struct kstat stat)
1da177e4 LT	80	{
	81	struct nameidata nd;
	82	int error;
	83
5590ff0d	84	error = __user_walk_fd(dfd, name, 0, &nd);
1da177e4 LT	85	if (!error) {
	86	error = vfs_getattr(nd.mnt, nd.dentry, stat);
	87	path_release(&nd);
	88	}
	89	return error;
	90	}
	91
5590ff0d UD	92	int vfs_lstat(char __user name, struct kstat stat)
	93	{
	94	return vfs_lstat_fd(AT_FDCWD, name, stat);
	95	}
	96
1da177e4 LT	97	EXPORT_SYMBOL(vfs_lstat);
	98
	99	int vfs_fstat(unsigned int fd, struct kstat *stat)
	100	{
	101	struct file *f = fget(fd);
	102	int error = -EBADF;
	103
	104	if (f) {
	105	error = vfs_getattr(f->f_vfsmnt, f->f_dentry, stat);
	106	fput(f);
	107	}
	108	return error;
	109	}
	110
	111	EXPORT_SYMBOL(vfs_fstat);
	112
	113	#ifdef __ARCH_WANT_OLD_STAT
	114
	115	/*
	116	* For backward compatibility? Maybe this should be moved
	117	* into arch/i386 instead?
	118	*/
	119	static int cp_old_stat(struct kstat stat, struct __old_kernel_stat __user statbuf)
	120	{
	121	static int warncount = 5;
	122	struct __old_kernel_stat tmp;
	123
	124	if (warncount > 0) {
	125	warncount--;
	126	printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n",
	127	current->comm);
	128	} else if (warncount < 0) {
	129	/* it's laughable, but... */
	130	warncount = 0;
	131	}
	132
	133	memset(&tmp, 0, sizeof(struct __old_kernel_stat));
	134	tmp.st_dev = old_encode_dev(stat->dev);
	135	tmp.st_ino = stat->ino;
afefdbb2 DH	136	if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
afefdbb2 DH	137	return -EOVERFLOW;
1da177e4 LT	138	tmp.st_mode = stat->mode;
	139	tmp.st_nlink = stat->nlink;
	140	if (tmp.st_nlink != stat->nlink)
	141	return -EOVERFLOW;
	142	SET_UID(tmp.st_uid, stat->uid);
	143	SET_GID(tmp.st_gid, stat->gid);
	144	tmp.st_rdev = old_encode_dev(stat->rdev);
	145	#if BITS_PER_LONG == 32
	146	if (stat->size > MAX_NON_LFS)
	147	return -EOVERFLOW;
	148	#endif
	149	tmp.st_size = stat->size;
	150	tmp.st_atime = stat->atime.tv_sec;
	151	tmp.st_mtime = stat->mtime.tv_sec;
	152	tmp.st_ctime = stat->ctime.tv_sec;
	153	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
	154	}
	155
	156	asmlinkage long sys_stat(char __user * filename, struct __old_kernel_stat __user * statbuf)
	157	{
	158	struct kstat stat;
5590ff0d	159	int error = vfs_stat_fd(AT_FDCWD, filename, &stat);
1da177e4 LT	160
	161	if (!error)
	162	error = cp_old_stat(&stat, statbuf);
	163
	164	return error;
	165	}
	166	asmlinkage long sys_lstat(char __user * filename, struct __old_kernel_stat __user * statbuf)
	167	{
	168	struct kstat stat;
5590ff0d	169	int error = vfs_lstat_fd(AT_FDCWD, filename, &stat);
1da177e4 LT	170
	171	if (!error)
	172	error = cp_old_stat(&stat, statbuf);
	173
	174	return error;
	175	}
	176	asmlinkage long sys_fstat(unsigned int fd, struct __old_kernel_stat __user * statbuf)
	177	{
	178	struct kstat stat;
	179	int error = vfs_fstat(fd, &stat);
	180
	181	if (!error)
	182	error = cp_old_stat(&stat, statbuf);
	183
	184	return error;
	185	}
	186
	187	#endif /* __ARCH_WANT_OLD_STAT */
	188
	189	static int cp_new_stat(struct kstat stat, struct stat __user statbuf)
	190	{
	191	struct stat tmp;
	192
	193	#if BITS_PER_LONG == 32
	194	if (!old_valid_dev(stat->dev) \|\| !old_valid_dev(stat->rdev))
	195	return -EOVERFLOW;
	196	#else
	197	if (!new_valid_dev(stat->dev) \|\| !new_valid_dev(stat->rdev))
	198	return -EOVERFLOW;
	199	#endif
	200
	201	memset(&tmp, 0, sizeof(tmp));
	202	#if BITS_PER_LONG == 32
	203	tmp.st_dev = old_encode_dev(stat->dev);
	204	#else
	205	tmp.st_dev = new_encode_dev(stat->dev);
	206	#endif
	207	tmp.st_ino = stat->ino;
afefdbb2 DH	208	if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
afefdbb2 DH	209	return -EOVERFLOW;
1da177e4 LT	210	tmp.st_mode = stat->mode;
	211	tmp.st_nlink = stat->nlink;
	212	if (tmp.st_nlink != stat->nlink)
	213	return -EOVERFLOW;
	214	SET_UID(tmp.st_uid, stat->uid);
	215	SET_GID(tmp.st_gid, stat->gid);
	216	#if BITS_PER_LONG == 32
	217	tmp.st_rdev = old_encode_dev(stat->rdev);
	218	#else
	219	tmp.st_rdev = new_encode_dev(stat->rdev);
	220	#endif
	221	#if BITS_PER_LONG == 32
	222	if (stat->size > MAX_NON_LFS)
	223	return -EOVERFLOW;
	224	#endif
	225	tmp.st_size = stat->size;
	226	tmp.st_atime = stat->atime.tv_sec;
	227	tmp.st_mtime = stat->mtime.tv_sec;
	228	tmp.st_ctime = stat->ctime.tv_sec;
	229	#ifdef STAT_HAVE_NSEC
	230	tmp.st_atime_nsec = stat->atime.tv_nsec;
	231	tmp.st_mtime_nsec = stat->mtime.tv_nsec;
	232	tmp.st_ctime_nsec = stat->ctime.tv_nsec;
	233	#endif
	234	tmp.st_blocks = stat->blocks;
	235	tmp.st_blksize = stat->blksize;
	236	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
	237	}
	238
5590ff0d UD	239	asmlinkage long sys_newstat(char __user filename, struct stat __user statbuf)
	240	{
	241	struct kstat stat;
	242	int error = vfs_stat_fd(AT_FDCWD, filename, &stat);
	243
	244	if (!error)
	245	error = cp_new_stat(&stat, statbuf);
	246
	247	return error;
	248	}
	249
	250	asmlinkage long sys_newlstat(char __user filename, struct stat __user statbuf)
1da177e4 LT	251	{
1da177e4 LT	252	struct kstat stat;
5590ff0d	253	int error = vfs_lstat_fd(AT_FDCWD, filename, &stat);
1da177e4 LT	254
	255	if (!error)
	256	error = cp_new_stat(&stat, statbuf);
	257
	258	return error;
	259	}
5590ff0d	260
2833c28a	261	#if !defined(__ARCH_WANT_STAT64) \|\| defined(__ARCH_WANT_SYS_NEWFSTATAT)
5590ff0d UD	262	asmlinkage long sys_newfstatat(int dfd, char __user *filename,
5590ff0d UD	263	struct stat __user *statbuf, int flag)
1da177e4 LT	264	{
1da177e4 LT	265	struct kstat stat;
5590ff0d UD	266	int error = -EINVAL;
	267
	268	if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
	269	goto out;
	270
	271	if (flag & AT_SYMLINK_NOFOLLOW)
	272	error = vfs_lstat_fd(dfd, filename, &stat);
	273	else
	274	error = vfs_stat_fd(dfd, filename, &stat);
1da177e4 LT	275
	276	if (!error)
	277	error = cp_new_stat(&stat, statbuf);
	278
5590ff0d	279	out:
1da177e4 LT	280	return error;
1da177e4 LT	281	}
cff2b760	282	#endif
5590ff0d UD	283
5590ff0d UD	284	asmlinkage long sys_newfstat(unsigned int fd, struct stat __user *statbuf)
1da177e4 LT	285	{
	286	struct kstat stat;
	287	int error = vfs_fstat(fd, &stat);
	288
	289	if (!error)
	290	error = cp_new_stat(&stat, statbuf);
	291
	292	return error;
	293	}
	294
5590ff0d UD	295	asmlinkage long sys_readlinkat(int dfd, const char __user *path,
5590ff0d UD	296	char __user *buf, int bufsiz)
1da177e4 LT	297	{
	298	struct nameidata nd;
	299	int error;
	300
	301	if (bufsiz <= 0)
	302	return -EINVAL;
	303
5590ff0d	304	error = __user_walk_fd(dfd, path, 0, &nd);
1da177e4 LT	305	if (!error) {
	306	struct inode * inode = nd.dentry->d_inode;
	307
	308	error = -EINVAL;
	309	if (inode->i_op && inode->i_op->readlink) {
	310	error = security_inode_readlink(nd.dentry);
	311	if (!error) {
	312	touch_atime(nd.mnt, nd.dentry);
	313	error = inode->i_op->readlink(nd.dentry, buf, bufsiz);
	314	}
	315	}
	316	path_release(&nd);
	317	}
	318	return error;
	319	}
	320
5590ff0d UD	321	asmlinkage long sys_readlink(const char __user path, char __user buf,
	322	int bufsiz)
	323	{
	324	return sys_readlinkat(AT_FDCWD, path, buf, bufsiz);
	325	}
	326
1da177e4 LT	327
	328	/* ---------- LFS-64 ----------- */
	329	#ifdef __ARCH_WANT_STAT64
	330
	331	static long cp_new_stat64(struct kstat stat, struct stat64 __user statbuf)
	332	{
	333	struct stat64 tmp;
	334
	335	memset(&tmp, 0, sizeof(struct stat64));
	336	#ifdef CONFIG_MIPS
	337	/* mips has weird padding, so we don't get 64 bits there */
	338	if (!new_valid_dev(stat->dev) \|\| !new_valid_dev(stat->rdev))
	339	return -EOVERFLOW;
	340	tmp.st_dev = new_encode_dev(stat->dev);
	341	tmp.st_rdev = new_encode_dev(stat->rdev);
	342	#else
	343	tmp.st_dev = huge_encode_dev(stat->dev);
	344	tmp.st_rdev = huge_encode_dev(stat->rdev);
	345	#endif
	346	tmp.st_ino = stat->ino;
afefdbb2 DH	347	if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
afefdbb2 DH	348	return -EOVERFLOW;
1da177e4 LT	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);