[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);

#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 = -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

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 = -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>
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
	112	#ifdef __ARCH_WANT_OLD_STAT
	113
	114	/*
	115	* For backward compatibility? Maybe this should be moved
	116	* into arch/i386 instead?
	117	*/
	118	static int cp_old_stat(struct kstat stat, struct __old_kernel_stat __user statbuf)
	119	{
	120	static int warncount = 5;
	121	struct __old_kernel_stat tmp;
	122
	123	if (warncount > 0) {
	124	warncount--;
	125	printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n",
	126	current->comm);
	127	} else if (warncount < 0) {
	128	/* it's laughable, but... */
	129	warncount = 0;
	130	}
	131
	132	memset(&tmp, 0, sizeof(struct __old_kernel_stat));
	133	tmp.st_dev = old_encode_dev(stat->dev);
	134	tmp.st_ino = stat->ino;
afefdbb2 DH	135	if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
afefdbb2 DH	136	return -EOVERFLOW;
1da177e4 LT	137	tmp.st_mode = stat->mode;
	138	tmp.st_nlink = stat->nlink;
	139	if (tmp.st_nlink != stat->nlink)
	140	return -EOVERFLOW;
	141	SET_UID(tmp.st_uid, stat->uid);
	142	SET_GID(tmp.st_gid, stat->gid);
	143	tmp.st_rdev = old_encode_dev(stat->rdev);
	144	#if BITS_PER_LONG == 32
	145	if (stat->size > MAX_NON_LFS)
	146	return -EOVERFLOW;
	147	#endif
	148	tmp.st_size = stat->size;
	149	tmp.st_atime = stat->atime.tv_sec;
	150	tmp.st_mtime = stat->mtime.tv_sec;
	151	tmp.st_ctime = stat->ctime.tv_sec;
	152	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
	153	}
	154
bdc480e3	155	SYSCALL_DEFINE2(stat, char __user , filename, struct __old_kernel_stat __user , statbuf)
1da177e4 LT	156	{
1da177e4 LT	157	struct kstat stat;
5590ff0d	158	int error = vfs_stat_fd(AT_FDCWD, filename, &stat);
1da177e4 LT	159
	160	if (!error)
	161	error = cp_old_stat(&stat, statbuf);
	162
	163	return error;
	164	}
257ac264 HC	165
257ac264 HC	166	SYSCALL_DEFINE2(lstat, char __user , filename, struct __old_kernel_stat __user , statbuf)
1da177e4 LT	167	{
1da177e4 LT	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	}
257ac264 HC	176
257ac264 HC	177	SYSCALL_DEFINE2(fstat, unsigned int, fd, struct __old_kernel_stat __user *, statbuf)
1da177e4 LT	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;
afefdbb2 DH	209	if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
afefdbb2 DH	210	return -EOVERFLOW;
1da177e4 LT	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
257ac264	240	SYSCALL_DEFINE2(newstat, char __user , filename, struct stat __user , statbuf)
5590ff0d UD	241	{
	242	struct kstat stat;
	243	int error = vfs_stat_fd(AT_FDCWD, filename, &stat);
	244
	245	if (!error)
	246	error = cp_new_stat(&stat, statbuf);
	247
	248	return error;
	249	}
	250
257ac264	251	SYSCALL_DEFINE2(newlstat, char __user , filename, struct stat __user , statbuf)
1da177e4 LT	252	{
1da177e4 LT	253	struct kstat stat;
5590ff0d	254	int error = vfs_lstat_fd(AT_FDCWD, filename, &stat);
1da177e4 LT	255
	256	if (!error)
	257	error = cp_new_stat(&stat, statbuf);
	258
	259	return error;
	260	}
5590ff0d	261
2833c28a	262	#if !defined(__ARCH_WANT_STAT64) \|\| defined(__ARCH_WANT_SYS_NEWFSTATAT)
6559eed8 HC	263	SYSCALL_DEFINE4(newfstatat, int, dfd, char __user *, filename,
6559eed8 HC	264	struct stat __user *, statbuf, int, flag)
1da177e4 LT	265	{
1da177e4 LT	266	struct kstat stat;
5590ff0d UD	267	int error = -EINVAL;
	268
	269	if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
	270	goto out;
	271
	272	if (flag & AT_SYMLINK_NOFOLLOW)
	273	error = vfs_lstat_fd(dfd, filename, &stat);
	274	else
	275	error = vfs_stat_fd(dfd, filename, &stat);
1da177e4 LT	276
	277	if (!error)
	278	error = cp_new_stat(&stat, statbuf);
	279
5590ff0d	280	out:
1da177e4 LT	281	return error;
1da177e4 LT	282	}
cff2b760	283	#endif
5590ff0d	284
257ac264	285	SYSCALL_DEFINE2(newfstat, unsigned int, fd, struct stat __user *, statbuf)
1da177e4 LT	286	{
	287	struct kstat stat;
	288	int error = vfs_fstat(fd, &stat);
	289
	290	if (!error)
	291	error = cp_new_stat(&stat, statbuf);
	292
	293	return error;
	294	}
	295
6559eed8 HC	296	SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname,
6559eed8 HC	297	char __user *, buf, int, bufsiz)
1da177e4	298	{
2d8f3038	299	struct path path;
1da177e4 LT	300	int error;
	301
	302	if (bufsiz <= 0)
	303	return -EINVAL;
	304
2d8f3038	305	error = user_path_at(dfd, pathname, 0, &path);
1da177e4	306	if (!error) {
2d8f3038	307	struct inode *inode = path.dentry->d_inode;
1da177e4 LT	308
1da177e4 LT	309	error = -EINVAL;
acfa4380	310	if (inode->i_op->readlink) {
2d8f3038	311	error = security_inode_readlink(path.dentry);
1da177e4	312	if (!error) {
2d8f3038 AV	313	touch_atime(path.mnt, path.dentry);
2d8f3038 AV	314	error = inode->i_op->readlink(path.dentry,
4ac91378	315	buf, bufsiz);
1da177e4 LT	316	}
1da177e4 LT	317	}
2d8f3038	318	path_put(&path);
1da177e4 LT	319	}
	320	return error;
	321	}
	322
002c8976 HC	323	SYSCALL_DEFINE3(readlink, const char __user , path, char __user , buf,
002c8976 HC	324	int, bufsiz)
5590ff0d UD	325	{
	326	return sys_readlinkat(AT_FDCWD, path, buf, bufsiz);
	327	}
	328
1da177e4 LT	329
	330	/* ---------- LFS-64 ----------- */
	331	#ifdef __ARCH_WANT_STAT64
	332
	333	static long cp_new_stat64(struct kstat stat, struct stat64 __user statbuf)
	334	{
	335	struct stat64 tmp;
	336
	337	memset(&tmp, 0, sizeof(struct stat64));
	338	#ifdef CONFIG_MIPS
	339	/* mips has weird padding, so we don't get 64 bits there */
	340	if (!new_valid_dev(stat->dev) \|\| !new_valid_dev(stat->rdev))
	341	return -EOVERFLOW;
	342	tmp.st_dev = new_encode_dev(stat->dev);
	343	tmp.st_rdev = new_encode_dev(stat->rdev);
	344	#else
	345	tmp.st_dev = huge_encode_dev(stat->dev);
	346	tmp.st_rdev = huge_encode_dev(stat->rdev);
	347	#endif
	348	tmp.st_ino = stat->ino;
afefdbb2 DH	349	if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
afefdbb2 DH	350	return -EOVERFLOW;
1da177e4 LT	351	#ifdef STAT64_HAS_BROKEN_ST_INO
	352	tmp.__st_ino = stat->ino;
	353	#endif
	354	tmp.st_mode = stat->mode;
	355	tmp.st_nlink = stat->nlink;
	356	tmp.st_uid = stat->uid;
	357	tmp.st_gid = stat->gid;
	358	tmp.st_atime = stat->atime.tv_sec;
	359	tmp.st_atime_nsec = stat->atime.tv_nsec;
	360	tmp.st_mtime = stat->mtime.tv_sec;
	361	tmp.st_mtime_nsec = stat->mtime.tv_nsec;
	362	tmp.st_ctime = stat->ctime.tv_sec;
	363	tmp.st_ctime_nsec = stat->ctime.tv_nsec;
	364	tmp.st_size = stat->size;
	365	tmp.st_blocks = stat->blocks;
	366	tmp.st_blksize = stat->blksize;
	367	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
	368	}
	369
257ac264	370	SYSCALL_DEFINE2(stat64, char __user , filename, struct stat64 __user , statbuf)
1da177e4 LT	371	{
	372	struct kstat stat;
	373	int error = vfs_stat(filename, &stat);
	374
	375	if (!error)
	376	error = cp_new_stat64(&stat, statbuf);
	377
	378	return error;
	379	}
257ac264 HC	380
257ac264 HC	381	SYSCALL_DEFINE2(lstat64, char __user , filename, struct stat64 __user , statbuf)
1da177e4 LT	382	{
	383	struct kstat stat;
	384	int error = vfs_lstat(filename, &stat);
	385
	386	if (!error)
	387	error = cp_new_stat64(&stat, statbuf);
	388
	389	return error;
	390	}
257ac264 HC	391
257ac264 HC	392	SYSCALL_DEFINE2(fstat64, unsigned long, fd, struct stat64 __user *, statbuf)
1da177e4 LT	393	{
	394	struct kstat stat;
	395	int error = vfs_fstat(fd, &stat);
	396
	397	if (!error)
	398	error = cp_new_stat64(&stat, statbuf);
	399
	400	return error;
	401	}
	402
6559eed8 HC	403	SYSCALL_DEFINE4(fstatat64, int, dfd, char __user *, filename,
6559eed8 HC	404	struct stat64 __user *, statbuf, int, flag)
cff2b760 UD	405	{
	406	struct kstat stat;
	407	int error = -EINVAL;
	408
	409	if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
	410	goto out;
	411
	412	if (flag & AT_SYMLINK_NOFOLLOW)
	413	error = vfs_lstat_fd(dfd, filename, &stat);
	414	else
	415	error = vfs_stat_fd(dfd, filename, &stat);
	416
	417	if (!error)
	418	error = cp_new_stat64(&stat, statbuf);
	419
	420	out:
	421	return error;
	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);