[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_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, const char __user *filename, struct kstat *stat,
		int flag)
{
	struct path path;
	int error = -EINVAL;
	int lookup_flags = 0;

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

	if (!(flag & AT_SYMLINK_NOFOLLOW))
		lookup_flags |= LOOKUP_FOLLOW;

	error = user_path_at(dfd, filename, lookup_flags, &path);
	if (error)
		goto out;

	error = vfs_getattr(path.mnt, path.dentry, stat);
	path_put(&path);
out:
	return error;
}
EXPORT_SYMBOL(vfs_fstatat);

int vfs_stat(const char __user *name, struct kstat *stat)
{
	return vfs_fstatat(AT_FDCWD, name, stat, 0);
}
EXPORT_SYMBOL(vfs_stat);

int vfs_lstat(const char __user *name, struct kstat *stat)
{
	return vfs_fstatat(AT_FDCWD, name, stat, AT_SYMLINK_NOFOLLOW);
}
EXPORT_SYMBOL(vfs_lstat);


#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, const char __user *, filename,
		struct __old_kernel_stat __user *, statbuf)
{
	struct kstat stat;
	int error;

	error = vfs_stat(filename, &stat);
	if (error)
		return error;

	return cp_old_stat(&stat, statbuf);
}

SYSCALL_DEFINE2(lstat, const char __user *, filename,
		struct __old_kernel_stat __user *, statbuf)
{
	struct kstat stat;
	int error;

	error = vfs_lstat(filename, &stat);
	if (error)
		return error;

	return cp_old_stat(&stat, statbuf);
}

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, const char __user *, filename,
		struct stat __user *, statbuf)
{
	struct kstat stat;
	int error = vfs_stat(filename, &stat);

	if (error)
		return error;
	return cp_new_stat(&stat, statbuf);
}

SYSCALL_DEFINE2(newlstat, const char __user *, filename,
		struct stat __user *, statbuf)
{
	struct kstat stat;
	int error;

	error = vfs_lstat(filename, &stat);
	if (error)
		return error;

	return cp_new_stat(&stat, statbuf);
}

#if !defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_SYS_NEWFSTATAT)
SYSCALL_DEFINE4(newfstatat, int, dfd, const 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, const 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, const 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, const 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 */

/* Caller is here responsible for sufficient locking (ie. inode->i_lock) */
void __inode_add_bytes(struct inode *inode, loff_t bytes)
{
	inode->i_blocks += bytes >> 9;
	bytes &= 511;
	inode->i_bytes += bytes;
	if (inode->i_bytes >= 512) {
		inode->i_blocks++;
		inode->i_bytes -= 512;
	}
}

void inode_add_bytes(struct inode *inode, loff_t bytes)
{
	spin_lock(&inode->i_lock);
	__inode_add_bytes(inode, bytes);
	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
	1	/*
	2	* linux/fs/stat.c
	3	*
	4	* Copyright (C) 1991, 1992 Linus Torvalds
	5	*/
	6
	7	#include <linux/module.h>
	8	#include <linux/mm.h>
	9	#include <linux/errno.h>
	10	#include <linux/file.h>
	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>
	16	#include <linux/pagemap.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 = (1 << inode->i_blkbits);
	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	return 0;
	54	}
	55
	56	EXPORT_SYMBOL(vfs_getattr);
	57
	58	int vfs_fstat(unsigned int fd, struct kstat *stat)
	59	{
	60	struct file *f = fget(fd);
	61	int error = -EBADF;
	62
	63	if (f) {
	64	error = vfs_getattr(f->f_path.mnt, f->f_path.dentry, stat);
	65	fput(f);
	66	}
	67	return error;
	68	}
	69	EXPORT_SYMBOL(vfs_fstat);
	70
	71	int vfs_fstatat(int dfd, const char __user filename, struct kstat stat,
	72	int flag)
	73	{
	74	struct path path;
	75	int error = -EINVAL;
	76	int lookup_flags = 0;
	77
	78	if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
	79	goto out;
	80
	81	if (!(flag & AT_SYMLINK_NOFOLLOW))
	82	lookup_flags \|= LOOKUP_FOLLOW;
	83
	84	error = user_path_at(dfd, filename, lookup_flags, &path);
	85	if (error)
	86	goto out;
	87
	88	error = vfs_getattr(path.mnt, path.dentry, stat);
	89	path_put(&path);
	90	out:
	91	return error;
	92	}
	93	EXPORT_SYMBOL(vfs_fstatat);
	94
	95	int vfs_stat(const char __user name, struct kstat stat)
	96	{
	97	return vfs_fstatat(AT_FDCWD, name, stat, 0);
	98	}
	99	EXPORT_SYMBOL(vfs_stat);
	100
	101	int vfs_lstat(const char __user name, struct kstat stat)
	102	{
	103	return vfs_fstatat(AT_FDCWD, name, stat, AT_SYMLINK_NOFOLLOW);
	104	}
	105	EXPORT_SYMBOL(vfs_lstat);
	106
	107
	108	#ifdef __ARCH_WANT_OLD_STAT
	109
	110	/*
	111	* For backward compatibility? Maybe this should be moved
	112	* into arch/i386 instead?
	113	*/
	114	static int cp_old_stat(struct kstat stat, struct __old_kernel_stat __user statbuf)
	115	{
	116	static int warncount = 5;
	117	struct __old_kernel_stat tmp;
	118
	119	if (warncount > 0) {
	120	warncount--;
	121	printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n",
	122	current->comm);
	123	} else if (warncount < 0) {
	124	/* it's laughable, but... */
	125	warncount = 0;
	126	}
	127
	128	memset(&tmp, 0, sizeof(struct __old_kernel_stat));
	129	tmp.st_dev = old_encode_dev(stat->dev);
	130	tmp.st_ino = stat->ino;
	131	if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
	132	return -EOVERFLOW;
	133	tmp.st_mode = stat->mode;
	134	tmp.st_nlink = stat->nlink;
	135	if (tmp.st_nlink != stat->nlink)
	136	return -EOVERFLOW;
	137	SET_UID(tmp.st_uid, stat->uid);
	138	SET_GID(tmp.st_gid, stat->gid);
	139	tmp.st_rdev = old_encode_dev(stat->rdev);
	140	#if BITS_PER_LONG == 32
	141	if (stat->size > MAX_NON_LFS)
	142	return -EOVERFLOW;
	143	#endif
	144	tmp.st_size = stat->size;
	145	tmp.st_atime = stat->atime.tv_sec;
	146	tmp.st_mtime = stat->mtime.tv_sec;
	147	tmp.st_ctime = stat->ctime.tv_sec;
	148	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
	149	}
	150
	151	SYSCALL_DEFINE2(stat, const char __user *, filename,
	152	struct __old_kernel_stat __user *, statbuf)
	153	{
	154	struct kstat stat;
	155	int error;
	156
	157	error = vfs_stat(filename, &stat);
	158	if (error)
	159	return error;
	160
	161	return cp_old_stat(&stat, statbuf);
	162	}
	163
	164	SYSCALL_DEFINE2(lstat, const char __user *, filename,
	165	struct __old_kernel_stat __user *, statbuf)
	166	{
	167	struct kstat stat;
	168	int error;
	169
	170	error = vfs_lstat(filename, &stat);
	171	if (error)
	172	return error;
	173
	174	return cp_old_stat(&stat, statbuf);
	175	}
	176
	177	SYSCALL_DEFINE2(fstat, unsigned int, fd, struct __old_kernel_stat __user *, statbuf)
	178	{
	179	struct kstat stat;
	180	int error = vfs_fstat(fd, &stat);
	181
	182	if (!error)
	183	error = cp_old_stat(&stat, statbuf);
	184
	185	return error;
	186	}
	187
	188	#endif /* __ARCH_WANT_OLD_STAT */
	189
	190	static int cp_new_stat(struct kstat stat, struct stat __user statbuf)
	191	{
	192	struct stat tmp;
	193
	194	#if BITS_PER_LONG == 32
	195	if (!old_valid_dev(stat->dev) \|\| !old_valid_dev(stat->rdev))
	196	return -EOVERFLOW;
	197	#else
	198	if (!new_valid_dev(stat->dev) \|\| !new_valid_dev(stat->rdev))
	199	return -EOVERFLOW;
	200	#endif
	201
	202	memset(&tmp, 0, sizeof(tmp));
	203	#if BITS_PER_LONG == 32
	204	tmp.st_dev = old_encode_dev(stat->dev);
	205	#else
	206	tmp.st_dev = new_encode_dev(stat->dev);
	207	#endif
	208	tmp.st_ino = stat->ino;
	209	if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
	210	return -EOVERFLOW;
	211	tmp.st_mode = stat->mode;
	212	tmp.st_nlink = stat->nlink;
	213	if (tmp.st_nlink != stat->nlink)
	214	return -EOVERFLOW;
	215	SET_UID(tmp.st_uid, stat->uid);
	216	SET_GID(tmp.st_gid, stat->gid);
	217	#if BITS_PER_LONG == 32
	218	tmp.st_rdev = old_encode_dev(stat->rdev);
	219	#else
	220	tmp.st_rdev = new_encode_dev(stat->rdev);
	221	#endif
	222	#if BITS_PER_LONG == 32
	223	if (stat->size > MAX_NON_LFS)
	224	return -EOVERFLOW;
	225	#endif
	226	tmp.st_size = stat->size;
	227	tmp.st_atime = stat->atime.tv_sec;
	228	tmp.st_mtime = stat->mtime.tv_sec;
	229	tmp.st_ctime = stat->ctime.tv_sec;
	230	#ifdef STAT_HAVE_NSEC
	231	tmp.st_atime_nsec = stat->atime.tv_nsec;
	232	tmp.st_mtime_nsec = stat->mtime.tv_nsec;
	233	tmp.st_ctime_nsec = stat->ctime.tv_nsec;
	234	#endif
	235	tmp.st_blocks = stat->blocks;
	236	tmp.st_blksize = stat->blksize;
	237	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
	238	}
	239
	240	SYSCALL_DEFINE2(newstat, const char __user *, filename,
	241	struct stat __user *, statbuf)
	242	{
	243	struct kstat stat;
	244	int error = vfs_stat(filename, &stat);
	245
	246	if (error)
	247	return error;
	248	return cp_new_stat(&stat, statbuf);
	249	}
	250
	251	SYSCALL_DEFINE2(newlstat, const char __user *, filename,
	252	struct stat __user *, statbuf)
	253	{
	254	struct kstat stat;
	255	int error;
	256
	257	error = vfs_lstat(filename, &stat);
	258	if (error)
	259	return error;
	260
	261	return cp_new_stat(&stat, statbuf);
	262	}
	263
	264	#if !defined(__ARCH_WANT_STAT64) \|\| defined(__ARCH_WANT_SYS_NEWFSTATAT)
	265	SYSCALL_DEFINE4(newfstatat, int, dfd, const char __user *, filename,
	266	struct stat __user *, statbuf, int, flag)
	267	{
	268	struct kstat stat;
	269	int error;
	270
	271	error = vfs_fstatat(dfd, filename, &stat, flag);
	272	if (error)
	273	return error;
	274	return cp_new_stat(&stat, statbuf);
	275	}
	276	#endif
	277
	278	SYSCALL_DEFINE2(newfstat, unsigned int, fd, struct stat __user *, statbuf)
	279	{
	280	struct kstat stat;
	281	int error = vfs_fstat(fd, &stat);
	282
	283	if (!error)
	284	error = cp_new_stat(&stat, statbuf);
	285
	286	return error;
	287	}
	288
	289	SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname,
	290	char __user *, buf, int, bufsiz)
	291	{
	292	struct path path;
	293	int error;
	294
	295	if (bufsiz <= 0)
	296	return -EINVAL;
	297
	298	error = user_path_at(dfd, pathname, 0, &path);
	299	if (!error) {
	300	struct inode *inode = path.dentry->d_inode;
	301
	302	error = -EINVAL;
	303	if (inode->i_op->readlink) {
	304	error = security_inode_readlink(path.dentry);
	305	if (!error) {
	306	touch_atime(path.mnt, path.dentry);
	307	error = inode->i_op->readlink(path.dentry,
	308	buf, bufsiz);
	309	}
	310	}
	311	path_put(&path);
	312	}
	313	return error;
	314	}
	315
	316	SYSCALL_DEFINE3(readlink, const char __user , path, char __user , buf,
	317	int, bufsiz)
	318	{
	319	return sys_readlinkat(AT_FDCWD, path, buf, bufsiz);
	320	}
	321
	322
	323	/* ---------- LFS-64 ----------- */
	324	#ifdef __ARCH_WANT_STAT64
	325
	326	static long cp_new_stat64(struct kstat stat, struct stat64 __user statbuf)
	327	{
	328	struct stat64 tmp;
	329
	330	memset(&tmp, 0, sizeof(struct stat64));
	331	#ifdef CONFIG_MIPS
	332	/* mips has weird padding, so we don't get 64 bits there */
	333	if (!new_valid_dev(stat->dev) \|\| !new_valid_dev(stat->rdev))
	334	return -EOVERFLOW;
	335	tmp.st_dev = new_encode_dev(stat->dev);
	336	tmp.st_rdev = new_encode_dev(stat->rdev);
	337	#else
	338	tmp.st_dev = huge_encode_dev(stat->dev);
	339	tmp.st_rdev = huge_encode_dev(stat->rdev);
	340	#endif
	341	tmp.st_ino = stat->ino;
	342	if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
	343	return -EOVERFLOW;
	344	#ifdef STAT64_HAS_BROKEN_ST_INO
	345	tmp.__st_ino = stat->ino;
	346	#endif
	347	tmp.st_mode = stat->mode;
	348	tmp.st_nlink = stat->nlink;
	349	tmp.st_uid = stat->uid;
	350	tmp.st_gid = stat->gid;
	351	tmp.st_atime = stat->atime.tv_sec;
	352	tmp.st_atime_nsec = stat->atime.tv_nsec;
	353	tmp.st_mtime = stat->mtime.tv_sec;
	354	tmp.st_mtime_nsec = stat->mtime.tv_nsec;
	355	tmp.st_ctime = stat->ctime.tv_sec;
	356	tmp.st_ctime_nsec = stat->ctime.tv_nsec;
	357	tmp.st_size = stat->size;
	358	tmp.st_blocks = stat->blocks;
	359	tmp.st_blksize = stat->blksize;
	360	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
	361	}
	362
	363	SYSCALL_DEFINE2(stat64, const char __user *, filename,
	364	struct stat64 __user *, statbuf)
	365	{
	366	struct kstat stat;
	367	int error = vfs_stat(filename, &stat);
	368
	369	if (!error)
	370	error = cp_new_stat64(&stat, statbuf);
	371
	372	return error;
	373	}
	374
	375	SYSCALL_DEFINE2(lstat64, const char __user *, filename,
	376	struct stat64 __user *, statbuf)
	377	{
	378	struct kstat stat;
	379	int error = vfs_lstat(filename, &stat);
	380
	381	if (!error)
	382	error = cp_new_stat64(&stat, statbuf);
	383
	384	return error;
	385	}
	386
	387	SYSCALL_DEFINE2(fstat64, unsigned long, fd, struct stat64 __user *, statbuf)
	388	{
	389	struct kstat stat;
	390	int error = vfs_fstat(fd, &stat);
	391
	392	if (!error)
	393	error = cp_new_stat64(&stat, statbuf);
	394
	395	return error;
	396	}
	397
	398	SYSCALL_DEFINE4(fstatat64, int, dfd, const char __user *, filename,
	399	struct stat64 __user *, statbuf, int, flag)
	400	{
	401	struct kstat stat;
	402	int error;
	403
	404	error = vfs_fstatat(dfd, filename, &stat, flag);
	405	if (error)
	406	return error;
	407	return cp_new_stat64(&stat, statbuf);
	408	}
	409	#endif /* __ARCH_WANT_STAT64 */
	410
	411	/* Caller is here responsible for sufficient locking (ie. inode->i_lock) */
	412	void __inode_add_bytes(struct inode *inode, loff_t bytes)
	413	{
	414	inode->i_blocks += bytes >> 9;
	415	bytes &= 511;
	416	inode->i_bytes += bytes;
	417	if (inode->i_bytes >= 512) {
	418	inode->i_blocks++;
	419	inode->i_bytes -= 512;
	420	}
	421	}
	422
	423	void inode_add_bytes(struct inode *inode, loff_t bytes)
	424	{
	425	spin_lock(&inode->i_lock);
	426	__inode_add_bytes(inode, bytes);
	427	spin_unlock(&inode->i_lock);
	428	}
	429
	430	EXPORT_SYMBOL(inode_add_bytes);
	431
	432	void inode_sub_bytes(struct inode *inode, loff_t bytes)
	433	{
	434	spin_lock(&inode->i_lock);
	435	inode->i_blocks -= bytes >> 9;
	436	bytes &= 511;
	437	if (inode->i_bytes < bytes) {
	438	inode->i_blocks--;
	439	inode->i_bytes += 512;
	440	}
	441	inode->i_bytes -= bytes;
	442	spin_unlock(&inode->i_lock);
	443	}
	444
	445	EXPORT_SYMBOL(inode_sub_bytes);
	446
	447	loff_t inode_get_bytes(struct inode *inode)
	448	{
	449	loff_t ret;
	450
	451	spin_lock(&inode->i_lock);
	452	ret = (((loff_t)inode->i_blocks) << 9) + inode->i_bytes;
	453	spin_unlock(&inode->i_lock);
	454	return ret;
	455	}
	456
	457	EXPORT_SYMBOL(inode_get_bytes);
	458
	459	void inode_set_bytes(struct inode *inode, loff_t bytes)
	460	{
	461	/* Caller is here responsible for sufficient locking
	462	* (ie. inode->i_lock) */
	463	inode->i_blocks = bytes >> 9;
	464	inode->i_bytes = bytes & 511;
	465	}
	466
	467	EXPORT_SYMBOL(inode_set_bytes);