[deliverable/linux.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 | AT_NO_AUTOMOUNT)) != 0)
		goto out;

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

	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 \| AT_NO_AUTOMOUNT)) != 0)
	79	goto out;
	80
	81	if (!(flag & AT_SYMLINK_NOFOLLOW))
	82	lookup_flags \|= LOOKUP_FOLLOW;
	83	if (flag & AT_NO_AUTOMOUNT)
	84	lookup_flags \|= LOOKUP_NO_AUTOMOUNT;
	85
	86	error = user_path_at(dfd, filename, lookup_flags, &path);
	87	if (error)
	88	goto out;
	89
	90	error = vfs_getattr(path.mnt, path.dentry, stat);
	91	path_put(&path);
	92	out:
	93	return error;
	94	}
	95	EXPORT_SYMBOL(vfs_fstatat);
	96
	97	int vfs_stat(const char __user name, struct kstat stat)
	98	{
	99	return vfs_fstatat(AT_FDCWD, name, stat, 0);
	100	}
	101	EXPORT_SYMBOL(vfs_stat);
	102
	103	int vfs_lstat(const char __user name, struct kstat stat)
	104	{
	105	return vfs_fstatat(AT_FDCWD, name, stat, AT_SYMLINK_NOFOLLOW);
	106	}
	107	EXPORT_SYMBOL(vfs_lstat);
	108
	109
	110	#ifdef __ARCH_WANT_OLD_STAT
	111
	112	/*
	113	* For backward compatibility? Maybe this should be moved
	114	* into arch/i386 instead?
	115	*/
	116	static int cp_old_stat(struct kstat stat, struct __old_kernel_stat __user statbuf)
	117	{
	118	static int warncount = 5;
	119	struct __old_kernel_stat tmp;
	120
	121	if (warncount > 0) {
	122	warncount--;
	123	printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n",
	124	current->comm);
	125	} else if (warncount < 0) {
	126	/* it's laughable, but... */
	127	warncount = 0;
	128	}
	129
	130	memset(&tmp, 0, sizeof(struct __old_kernel_stat));
	131	tmp.st_dev = old_encode_dev(stat->dev);
	132	tmp.st_ino = stat->ino;
	133	if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
	134	return -EOVERFLOW;
	135	tmp.st_mode = stat->mode;
	136	tmp.st_nlink = stat->nlink;
	137	if (tmp.st_nlink != stat->nlink)
	138	return -EOVERFLOW;
	139	SET_UID(tmp.st_uid, stat->uid);
	140	SET_GID(tmp.st_gid, stat->gid);
	141	tmp.st_rdev = old_encode_dev(stat->rdev);
	142	#if BITS_PER_LONG == 32
	143	if (stat->size > MAX_NON_LFS)
	144	return -EOVERFLOW;
	145	#endif
	146	tmp.st_size = stat->size;
	147	tmp.st_atime = stat->atime.tv_sec;
	148	tmp.st_mtime = stat->mtime.tv_sec;
	149	tmp.st_ctime = stat->ctime.tv_sec;
	150	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
	151	}
	152
	153	SYSCALL_DEFINE2(stat, const char __user *, filename,
	154	struct __old_kernel_stat __user *, statbuf)
	155	{
	156	struct kstat stat;
	157	int error;
	158
	159	error = vfs_stat(filename, &stat);
	160	if (error)
	161	return error;
	162
	163	return cp_old_stat(&stat, statbuf);
	164	}
	165
	166	SYSCALL_DEFINE2(lstat, const char __user *, filename,
	167	struct __old_kernel_stat __user *, statbuf)
	168	{
	169	struct kstat stat;
	170	int error;
	171
	172	error = vfs_lstat(filename, &stat);
	173	if (error)
	174	return error;
	175
	176	return cp_old_stat(&stat, statbuf);
	177	}
	178
	179	SYSCALL_DEFINE2(fstat, unsigned int, fd, struct __old_kernel_stat __user *, statbuf)
	180	{
	181	struct kstat stat;
	182	int error = vfs_fstat(fd, &stat);
	183
	184	if (!error)
	185	error = cp_old_stat(&stat, statbuf);
	186
	187	return error;
	188	}
	189
	190	#endif /* __ARCH_WANT_OLD_STAT */
	191
	192	static int cp_new_stat(struct kstat stat, struct stat __user statbuf)
	193	{
	194	struct stat tmp;
	195
	196	#if BITS_PER_LONG == 32
	197	if (!old_valid_dev(stat->dev) \|\| !old_valid_dev(stat->rdev))
	198	return -EOVERFLOW;
	199	#else
	200	if (!new_valid_dev(stat->dev) \|\| !new_valid_dev(stat->rdev))
	201	return -EOVERFLOW;
	202	#endif
	203
	204	memset(&tmp, 0, sizeof(tmp));
	205	#if BITS_PER_LONG == 32
	206	tmp.st_dev = old_encode_dev(stat->dev);
	207	#else
	208	tmp.st_dev = new_encode_dev(stat->dev);
	209	#endif
	210	tmp.st_ino = stat->ino;
	211	if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
	212	return -EOVERFLOW;
	213	tmp.st_mode = stat->mode;
	214	tmp.st_nlink = stat->nlink;
	215	if (tmp.st_nlink != stat->nlink)
	216	return -EOVERFLOW;
	217	SET_UID(tmp.st_uid, stat->uid);
	218	SET_GID(tmp.st_gid, stat->gid);
	219	#if BITS_PER_LONG == 32
	220	tmp.st_rdev = old_encode_dev(stat->rdev);
	221	#else
	222	tmp.st_rdev = new_encode_dev(stat->rdev);
	223	#endif
	224	#if BITS_PER_LONG == 32
	225	if (stat->size > MAX_NON_LFS)
	226	return -EOVERFLOW;
	227	#endif
	228	tmp.st_size = stat->size;
	229	tmp.st_atime = stat->atime.tv_sec;
	230	tmp.st_mtime = stat->mtime.tv_sec;
	231	tmp.st_ctime = stat->ctime.tv_sec;
	232	#ifdef STAT_HAVE_NSEC
	233	tmp.st_atime_nsec = stat->atime.tv_nsec;
	234	tmp.st_mtime_nsec = stat->mtime.tv_nsec;
	235	tmp.st_ctime_nsec = stat->ctime.tv_nsec;
	236	#endif
	237	tmp.st_blocks = stat->blocks;
	238	tmp.st_blksize = stat->blksize;
	239	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
	240	}
	241
	242	SYSCALL_DEFINE2(newstat, const char __user *, filename,
	243	struct stat __user *, statbuf)
	244	{
	245	struct kstat stat;
	246	int error = vfs_stat(filename, &stat);
	247
	248	if (error)
	249	return error;
	250	return cp_new_stat(&stat, statbuf);
	251	}
	252
	253	SYSCALL_DEFINE2(newlstat, const char __user *, filename,
	254	struct stat __user *, statbuf)
	255	{
	256	struct kstat stat;
	257	int error;
	258
	259	error = vfs_lstat(filename, &stat);
	260	if (error)
	261	return error;
	262
	263	return cp_new_stat(&stat, statbuf);
	264	}
	265
	266	#if !defined(__ARCH_WANT_STAT64) \|\| defined(__ARCH_WANT_SYS_NEWFSTATAT)
	267	SYSCALL_DEFINE4(newfstatat, int, dfd, const char __user *, filename,
	268	struct stat __user *, statbuf, int, flag)
	269	{
	270	struct kstat stat;
	271	int error;
	272
	273	error = vfs_fstatat(dfd, filename, &stat, flag);
	274	if (error)
	275	return error;
	276	return cp_new_stat(&stat, statbuf);
	277	}
	278	#endif
	279
	280	SYSCALL_DEFINE2(newfstat, unsigned int, fd, struct stat __user *, statbuf)
	281	{
	282	struct kstat stat;
	283	int error = vfs_fstat(fd, &stat);
	284
	285	if (!error)
	286	error = cp_new_stat(&stat, statbuf);
	287
	288	return error;
	289	}
	290
	291	SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname,
	292	char __user *, buf, int, bufsiz)
	293	{
	294	struct path path;
	295	int error;
	296
	297	if (bufsiz <= 0)
	298	return -EINVAL;
	299
	300	error = user_path_at(dfd, pathname, 0, &path);
	301	if (!error) {
	302	struct inode *inode = path.dentry->d_inode;
	303
	304	error = -EINVAL;
	305	if (inode->i_op->readlink) {
	306	error = security_inode_readlink(path.dentry);
	307	if (!error) {
	308	touch_atime(path.mnt, path.dentry);
	309	error = inode->i_op->readlink(path.dentry,
	310	buf, bufsiz);
	311	}
	312	}
	313	path_put(&path);
	314	}
	315	return error;
	316	}
	317
	318	SYSCALL_DEFINE3(readlink, const char __user , path, char __user , buf,
	319	int, bufsiz)
	320	{
	321	return sys_readlinkat(AT_FDCWD, path, buf, bufsiz);
	322	}
	323
	324
	325	/* ---------- LFS-64 ----------- */
	326	#ifdef __ARCH_WANT_STAT64
	327
	328	static long cp_new_stat64(struct kstat stat, struct stat64 __user statbuf)
	329	{
	330	struct stat64 tmp;
	331
	332	memset(&tmp, 0, sizeof(struct stat64));
	333	#ifdef CONFIG_MIPS
	334	/* mips has weird padding, so we don't get 64 bits there */
	335	if (!new_valid_dev(stat->dev) \|\| !new_valid_dev(stat->rdev))
	336	return -EOVERFLOW;
	337	tmp.st_dev = new_encode_dev(stat->dev);
	338	tmp.st_rdev = new_encode_dev(stat->rdev);
	339	#else
	340	tmp.st_dev = huge_encode_dev(stat->dev);
	341	tmp.st_rdev = huge_encode_dev(stat->rdev);
	342	#endif
	343	tmp.st_ino = stat->ino;
	344	if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
	345	return -EOVERFLOW;
	346	#ifdef STAT64_HAS_BROKEN_ST_INO
	347	tmp.__st_ino = stat->ino;
	348	#endif
	349	tmp.st_mode = stat->mode;
	350	tmp.st_nlink = stat->nlink;
	351	tmp.st_uid = stat->uid;
	352	tmp.st_gid = stat->gid;
	353	tmp.st_atime = stat->atime.tv_sec;
	354	tmp.st_atime_nsec = stat->atime.tv_nsec;
	355	tmp.st_mtime = stat->mtime.tv_sec;
	356	tmp.st_mtime_nsec = stat->mtime.tv_nsec;
	357	tmp.st_ctime = stat->ctime.tv_sec;
	358	tmp.st_ctime_nsec = stat->ctime.tv_nsec;
	359	tmp.st_size = stat->size;
	360	tmp.st_blocks = stat->blocks;
	361	tmp.st_blksize = stat->blksize;
	362	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
	363	}
	364
	365	SYSCALL_DEFINE2(stat64, const char __user *, filename,
	366	struct stat64 __user *, statbuf)
	367	{
	368	struct kstat stat;
	369	int error = vfs_stat(filename, &stat);
	370
	371	if (!error)
	372	error = cp_new_stat64(&stat, statbuf);
	373
	374	return error;
	375	}
	376
	377	SYSCALL_DEFINE2(lstat64, const char __user *, filename,
	378	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
	389	SYSCALL_DEFINE2(fstat64, unsigned long, fd, struct stat64 __user *, statbuf)
	390	{
	391	struct kstat stat;
	392	int error = vfs_fstat(fd, &stat);
	393
	394	if (!error)
	395	error = cp_new_stat64(&stat, statbuf);
	396
	397	return error;
	398	}
	399
	400	SYSCALL_DEFINE4(fstatat64, int, dfd, const char __user *, filename,
	401	struct stat64 __user *, statbuf, int, flag)
	402	{
	403	struct kstat stat;
	404	int error;
	405
	406	error = vfs_fstatat(dfd, filename, &stat, flag);
	407	if (error)
	408	return error;
	409	return cp_new_stat64(&stat, statbuf);
	410	}
	411	#endif /* __ARCH_WANT_STAT64 */
	412
	413	/* Caller is here responsible for sufficient locking (ie. inode->i_lock) */
	414	void __inode_add_bytes(struct inode *inode, loff_t bytes)
	415	{
	416	inode->i_blocks += bytes >> 9;
	417	bytes &= 511;
	418	inode->i_bytes += bytes;
	419	if (inode->i_bytes >= 512) {
	420	inode->i_blocks++;
	421	inode->i_bytes -= 512;
	422	}
	423	}
	424
	425	void inode_add_bytes(struct inode *inode, loff_t bytes)
	426	{
	427	spin_lock(&inode->i_lock);
	428	__inode_add_bytes(inode, bytes);
	429	spin_unlock(&inode->i_lock);
	430	}
	431
	432	EXPORT_SYMBOL(inode_add_bytes);
	433
	434	void inode_sub_bytes(struct inode *inode, loff_t bytes)
	435	{
	436	spin_lock(&inode->i_lock);
	437	inode->i_blocks -= bytes >> 9;
	438	bytes &= 511;
	439	if (inode->i_bytes < bytes) {
	440	inode->i_blocks--;
	441	inode->i_bytes += 512;
	442	}
	443	inode->i_bytes -= bytes;
	444	spin_unlock(&inode->i_lock);
	445	}
	446
	447	EXPORT_SYMBOL(inode_sub_bytes);
	448
	449	loff_t inode_get_bytes(struct inode *inode)
	450	{
	451	loff_t ret;
	452
	453	spin_lock(&inode->i_lock);
	454	ret = (((loff_t)inode->i_blocks) << 9) + inode->i_bytes;
	455	spin_unlock(&inode->i_lock);
	456	return ret;
	457	}
	458
	459	EXPORT_SYMBOL(inode_get_bytes);
	460
	461	void inode_set_bytes(struct inode *inode, loff_t bytes)
	462	{
	463	/* Caller is here responsible for sufficient locking
	464	* (ie. inode->i_lock) */
	465	inode->i_blocks = bytes >> 9;
	466	inode->i_bytes = bytes & 511;
	467	}
	468
	469	EXPORT_SYMBOL(inode_set_bytes);