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

int vfs_lstat(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, 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, 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, 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, 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, char __user *, filename,
		struct stat __user *, statbuf, int, flag)
{
	struct kstat stat;
	int error;

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

SYSCALL_DEFINE2(newfstat, unsigned int, fd, struct stat __user *, statbuf)
{
	struct kstat stat;
	int error = vfs_fstat(fd, &stat);

	if (!error)
		error = cp_new_stat(&stat, statbuf);

	return error;
}

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

	if (bufsiz <= 0)
		return -EINVAL;

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

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

SYSCALL_DEFINE3(readlink, const char __user *, path, char __user *, buf,
		int, bufsiz)
{
	return sys_readlinkat(AT_FDCWD, path, buf, bufsiz);
}


/* ---------- LFS-64 ----------- */
#ifdef __ARCH_WANT_STAT64

static long cp_new_stat64(struct kstat *stat, struct stat64 __user *statbuf)
{
	struct stat64 tmp;

	memset(&tmp, 0, sizeof(struct stat64));
#ifdef CONFIG_MIPS
	/* mips has weird padding, so we don't get 64 bits there */
	if (!new_valid_dev(stat->dev) || !new_valid_dev(stat->rdev))
		return -EOVERFLOW;
	tmp.st_dev = new_encode_dev(stat->dev);
	tmp.st_rdev = new_encode_dev(stat->rdev);
#else
	tmp.st_dev = huge_encode_dev(stat->dev);
	tmp.st_rdev = huge_encode_dev(stat->rdev);
#endif
	tmp.st_ino = stat->ino;
	if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
		return -EOVERFLOW;
#ifdef STAT64_HAS_BROKEN_ST_INO
	tmp.__st_ino = stat->ino;
#endif
	tmp.st_mode = stat->mode;
	tmp.st_nlink = stat->nlink;
	tmp.st_uid = stat->uid;
	tmp.st_gid = stat->gid;
	tmp.st_atime = stat->atime.tv_sec;
	tmp.st_atime_nsec = stat->atime.tv_nsec;
	tmp.st_mtime = stat->mtime.tv_sec;
	tmp.st_mtime_nsec = stat->mtime.tv_nsec;
	tmp.st_ctime = stat->ctime.tv_sec;
	tmp.st_ctime_nsec = stat->ctime.tv_nsec;
	tmp.st_size = stat->size;
	tmp.st_blocks = stat->blocks;
	tmp.st_blksize = stat->blksize;
	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
}

SYSCALL_DEFINE2(stat64, char __user *, filename, struct stat64 __user *, statbuf)
{
	struct kstat stat;
	int error = vfs_stat(filename, &stat);

	if (!error)
		error = cp_new_stat64(&stat, statbuf);

	return error;
}

SYSCALL_DEFINE2(lstat64, char __user *, filename, struct stat64 __user *, statbuf)
{
	struct kstat stat;
	int error = vfs_lstat(filename, &stat);

	if (!error)
		error = cp_new_stat64(&stat, statbuf);

	return error;
}

SYSCALL_DEFINE2(fstat64, unsigned long, fd, struct stat64 __user *, statbuf)
{
	struct kstat stat;
	int error = vfs_fstat(fd, &stat);

	if (!error)
		error = cp_new_stat64(&stat, statbuf);

	return error;
}

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

	error = vfs_fstatat(dfd, filename, &stat, flag);
	if (error)
		return error;
	return cp_new_stat64(&stat, statbuf);
}
#endif /* __ARCH_WANT_STAT64 */

/* 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
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
1da177e4 LT	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) {
0f7fc9e4	64	error = vfs_getattr(f->f_path.mnt, f->f_path.dentry, stat);
1da177e4 LT	65	fput(f);
	66	}
	67	return error;
	68	}
1da177e4 LT	69	EXPORT_SYMBOL(vfs_fstat);
1da177e4 LT	70
0112fc22 OD	71	int vfs_fstatat(int dfd, char __user filename, struct kstat stat, int flag)
0112fc22 OD	72	{
2eae7a18	73	struct path path;
0112fc22	74	int error = -EINVAL;
2eae7a18	75	int lookup_flags = 0;
0112fc22 OD	76
	77	if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
	78	goto out;
	79
2eae7a18 CH	80	if (!(flag & AT_SYMLINK_NOFOLLOW))
	81	lookup_flags \|= LOOKUP_FOLLOW;
	82
	83	error = user_path_at(dfd, filename, lookup_flags, &path);
	84	if (error)
	85	goto out;
	86
	87	error = vfs_getattr(path.mnt, path.dentry, stat);
	88	path_put(&path);
0112fc22 OD	89	out:
	90	return error;
	91	}
0112fc22 OD	92	EXPORT_SYMBOL(vfs_fstatat);
0112fc22 OD	93
2eae7a18 CH	94	int vfs_stat(char __user name, struct kstat stat)
	95	{
	96	return vfs_fstatat(AT_FDCWD, name, stat, 0);
	97	}
	98	EXPORT_SYMBOL(vfs_stat);
	99
	100	int vfs_lstat(char __user name, struct kstat stat)
	101	{
	102	return vfs_fstatat(AT_FDCWD, name, stat, AT_SYMLINK_NOFOLLOW);
	103	}
	104	EXPORT_SYMBOL(vfs_lstat);
	105
0112fc22	106
1da177e4 LT	107	#ifdef __ARCH_WANT_OLD_STAT
	108
	109	/*
	110	* For backward compatibility? Maybe this should be moved
	111	* into arch/i386 instead?
	112	*/
	113	static int cp_old_stat(struct kstat stat, struct __old_kernel_stat __user statbuf)
	114	{
	115	static int warncount = 5;
	116	struct __old_kernel_stat tmp;
	117
	118	if (warncount > 0) {
	119	warncount--;
	120	printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n",
	121	current->comm);
	122	} else if (warncount < 0) {
	123	/* it's laughable, but... */
	124	warncount = 0;
	125	}
	126
	127	memset(&tmp, 0, sizeof(struct __old_kernel_stat));
	128	tmp.st_dev = old_encode_dev(stat->dev);
	129	tmp.st_ino = stat->ino;
afefdbb2 DH	130	if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
afefdbb2 DH	131	return -EOVERFLOW;
1da177e4 LT	132	tmp.st_mode = stat->mode;
	133	tmp.st_nlink = stat->nlink;
	134	if (tmp.st_nlink != stat->nlink)
	135	return -EOVERFLOW;
	136	SET_UID(tmp.st_uid, stat->uid);
	137	SET_GID(tmp.st_gid, stat->gid);
	138	tmp.st_rdev = old_encode_dev(stat->rdev);
	139	#if BITS_PER_LONG == 32
	140	if (stat->size > MAX_NON_LFS)
	141	return -EOVERFLOW;
	142	#endif
	143	tmp.st_size = stat->size;
	144	tmp.st_atime = stat->atime.tv_sec;
	145	tmp.st_mtime = stat->mtime.tv_sec;
	146	tmp.st_ctime = stat->ctime.tv_sec;
	147	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
	148	}
	149
bdc480e3	150	SYSCALL_DEFINE2(stat, char __user , filename, struct __old_kernel_stat __user , statbuf)
1da177e4 LT	151	{
1da177e4 LT	152	struct kstat stat;
2eae7a18	153	int error;
1da177e4	154
2eae7a18 CH	155	error = vfs_stat(filename, &stat);
	156	if (error)
	157	return error;
1da177e4	158
2eae7a18	159	return cp_old_stat(&stat, statbuf);
1da177e4	160	}
257ac264 HC	161
257ac264 HC	162	SYSCALL_DEFINE2(lstat, char __user , filename, struct __old_kernel_stat __user , statbuf)
1da177e4 LT	163	{
1da177e4 LT	164	struct kstat stat;
2eae7a18	165	int error;
1da177e4	166
2eae7a18 CH	167	error = vfs_lstat(filename, &stat);
	168	if (error)
	169	return error;
1da177e4	170
2eae7a18	171	return cp_old_stat(&stat, statbuf);
1da177e4	172	}
257ac264 HC	173
257ac264 HC	174	SYSCALL_DEFINE2(fstat, unsigned int, fd, struct __old_kernel_stat __user *, statbuf)
1da177e4 LT	175	{
	176	struct kstat stat;
	177	int error = vfs_fstat(fd, &stat);
	178
	179	if (!error)
	180	error = cp_old_stat(&stat, statbuf);
	181
	182	return error;
	183	}
	184
	185	#endif /* __ARCH_WANT_OLD_STAT */
	186
	187	static int cp_new_stat(struct kstat stat, struct stat __user statbuf)
	188	{
	189	struct stat tmp;
	190
	191	#if BITS_PER_LONG == 32
	192	if (!old_valid_dev(stat->dev) \|\| !old_valid_dev(stat->rdev))
	193	return -EOVERFLOW;
	194	#else
	195	if (!new_valid_dev(stat->dev) \|\| !new_valid_dev(stat->rdev))
	196	return -EOVERFLOW;
	197	#endif
	198
	199	memset(&tmp, 0, sizeof(tmp));
	200	#if BITS_PER_LONG == 32
	201	tmp.st_dev = old_encode_dev(stat->dev);
	202	#else
	203	tmp.st_dev = new_encode_dev(stat->dev);
	204	#endif
	205	tmp.st_ino = stat->ino;
afefdbb2 DH	206	if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
afefdbb2 DH	207	return -EOVERFLOW;
1da177e4 LT	208	tmp.st_mode = stat->mode;
	209	tmp.st_nlink = stat->nlink;
	210	if (tmp.st_nlink != stat->nlink)
	211	return -EOVERFLOW;
	212	SET_UID(tmp.st_uid, stat->uid);
	213	SET_GID(tmp.st_gid, stat->gid);
	214	#if BITS_PER_LONG == 32
	215	tmp.st_rdev = old_encode_dev(stat->rdev);
	216	#else
	217	tmp.st_rdev = new_encode_dev(stat->rdev);
	218	#endif
	219	#if BITS_PER_LONG == 32
	220	if (stat->size > MAX_NON_LFS)
	221	return -EOVERFLOW;
	222	#endif
	223	tmp.st_size = stat->size;
	224	tmp.st_atime = stat->atime.tv_sec;
	225	tmp.st_mtime = stat->mtime.tv_sec;
	226	tmp.st_ctime = stat->ctime.tv_sec;
	227	#ifdef STAT_HAVE_NSEC
	228	tmp.st_atime_nsec = stat->atime.tv_nsec;
	229	tmp.st_mtime_nsec = stat->mtime.tv_nsec;
	230	tmp.st_ctime_nsec = stat->ctime.tv_nsec;
	231	#endif
	232	tmp.st_blocks = stat->blocks;
	233	tmp.st_blksize = stat->blksize;
	234	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
	235	}
	236
257ac264	237	SYSCALL_DEFINE2(newstat, char __user , filename, struct stat __user , statbuf)
5590ff0d UD	238	{
5590ff0d UD	239	struct kstat stat;
2eae7a18	240	int error = vfs_stat(filename, &stat);
5590ff0d	241
2eae7a18 CH	242	if (error)
	243	return error;
	244	return cp_new_stat(&stat, statbuf);
5590ff0d UD	245	}
5590ff0d UD	246
257ac264	247	SYSCALL_DEFINE2(newlstat, char __user , filename, struct stat __user , statbuf)
1da177e4 LT	248	{
1da177e4 LT	249	struct kstat stat;
2eae7a18	250	int error;
1da177e4	251
2eae7a18 CH	252	error = vfs_lstat(filename, &stat);
	253	if (error)
	254	return error;
1da177e4	255
2eae7a18	256	return cp_new_stat(&stat, statbuf);
1da177e4	257	}
5590ff0d	258
2833c28a	259	#if !defined(__ARCH_WANT_STAT64) \|\| defined(__ARCH_WANT_SYS_NEWFSTATAT)
6559eed8 HC	260	SYSCALL_DEFINE4(newfstatat, int, dfd, char __user *, filename,
6559eed8 HC	261	struct stat __user *, statbuf, int, flag)
1da177e4 LT	262	{
1da177e4 LT	263	struct kstat stat;
0112fc22	264	int error;
1da177e4	265
0112fc22 OD	266	error = vfs_fstatat(dfd, filename, &stat, flag);
	267	if (error)
	268	return error;
	269	return cp_new_stat(&stat, statbuf);
1da177e4	270	}
cff2b760	271	#endif
5590ff0d	272
257ac264	273	SYSCALL_DEFINE2(newfstat, unsigned int, fd, struct stat __user *, statbuf)
1da177e4 LT	274	{
	275	struct kstat stat;
	276	int error = vfs_fstat(fd, &stat);
	277
	278	if (!error)
	279	error = cp_new_stat(&stat, statbuf);
	280
	281	return error;
	282	}
	283
6559eed8 HC	284	SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname,
6559eed8 HC	285	char __user *, buf, int, bufsiz)
1da177e4	286	{
2d8f3038	287	struct path path;
1da177e4 LT	288	int error;
	289
	290	if (bufsiz <= 0)
	291	return -EINVAL;
	292
2d8f3038	293	error = user_path_at(dfd, pathname, 0, &path);
1da177e4	294	if (!error) {
2d8f3038	295	struct inode *inode = path.dentry->d_inode;
1da177e4 LT	296
1da177e4 LT	297	error = -EINVAL;
acfa4380	298	if (inode->i_op->readlink) {
2d8f3038	299	error = security_inode_readlink(path.dentry);
1da177e4	300	if (!error) {
2d8f3038 AV	301	touch_atime(path.mnt, path.dentry);
2d8f3038 AV	302	error = inode->i_op->readlink(path.dentry,
4ac91378	303	buf, bufsiz);
1da177e4 LT	304	}
1da177e4 LT	305	}
2d8f3038	306	path_put(&path);
1da177e4 LT	307	}
	308	return error;
	309	}
	310
002c8976 HC	311	SYSCALL_DEFINE3(readlink, const char __user , path, char __user , buf,
002c8976 HC	312	int, bufsiz)
5590ff0d UD	313	{
	314	return sys_readlinkat(AT_FDCWD, path, buf, bufsiz);
	315	}
	316
1da177e4 LT	317
	318	/* ---------- LFS-64 ----------- */
	319	#ifdef __ARCH_WANT_STAT64
	320
	321	static long cp_new_stat64(struct kstat stat, struct stat64 __user statbuf)
	322	{
	323	struct stat64 tmp;
	324
	325	memset(&tmp, 0, sizeof(struct stat64));
	326	#ifdef CONFIG_MIPS
	327	/* mips has weird padding, so we don't get 64 bits there */
	328	if (!new_valid_dev(stat->dev) \|\| !new_valid_dev(stat->rdev))
	329	return -EOVERFLOW;
	330	tmp.st_dev = new_encode_dev(stat->dev);
	331	tmp.st_rdev = new_encode_dev(stat->rdev);
	332	#else
	333	tmp.st_dev = huge_encode_dev(stat->dev);
	334	tmp.st_rdev = huge_encode_dev(stat->rdev);
	335	#endif
	336	tmp.st_ino = stat->ino;
afefdbb2 DH	337	if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
afefdbb2 DH	338	return -EOVERFLOW;
1da177e4 LT	339	#ifdef STAT64_HAS_BROKEN_ST_INO
	340	tmp.__st_ino = stat->ino;
	341	#endif
	342	tmp.st_mode = stat->mode;
	343	tmp.st_nlink = stat->nlink;
	344	tmp.st_uid = stat->uid;
	345	tmp.st_gid = stat->gid;
	346	tmp.st_atime = stat->atime.tv_sec;
	347	tmp.st_atime_nsec = stat->atime.tv_nsec;
	348	tmp.st_mtime = stat->mtime.tv_sec;
	349	tmp.st_mtime_nsec = stat->mtime.tv_nsec;
	350	tmp.st_ctime = stat->ctime.tv_sec;
	351	tmp.st_ctime_nsec = stat->ctime.tv_nsec;
	352	tmp.st_size = stat->size;
	353	tmp.st_blocks = stat->blocks;
	354	tmp.st_blksize = stat->blksize;
	355	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
	356	}
	357
257ac264	358	SYSCALL_DEFINE2(stat64, char __user , filename, struct stat64 __user , statbuf)
1da177e4 LT	359	{
	360	struct kstat stat;
	361	int error = vfs_stat(filename, &stat);
	362
	363	if (!error)
	364	error = cp_new_stat64(&stat, statbuf);
	365
	366	return error;
	367	}
257ac264 HC	368
257ac264 HC	369	SYSCALL_DEFINE2(lstat64, char __user , filename, struct stat64 __user , statbuf)
1da177e4 LT	370	{
	371	struct kstat stat;
	372	int error = vfs_lstat(filename, &stat);
	373
	374	if (!error)
	375	error = cp_new_stat64(&stat, statbuf);
	376
	377	return error;
	378	}
257ac264 HC	379
257ac264 HC	380	SYSCALL_DEFINE2(fstat64, unsigned long, fd, struct stat64 __user *, statbuf)
1da177e4 LT	381	{
	382	struct kstat stat;
	383	int error = vfs_fstat(fd, &stat);
	384
	385	if (!error)
	386	error = cp_new_stat64(&stat, statbuf);
	387
	388	return error;
	389	}
	390
6559eed8 HC	391	SYSCALL_DEFINE4(fstatat64, int, dfd, char __user *, filename,
6559eed8 HC	392	struct stat64 __user *, statbuf, int, flag)
cff2b760 UD	393	{
cff2b760 UD	394	struct kstat stat;
0112fc22	395	int error;
cff2b760	396
0112fc22 OD	397	error = vfs_fstatat(dfd, filename, &stat, flag);
	398	if (error)
	399	return error;
	400	return cp_new_stat64(&stat, statbuf);
cff2b760	401	}
1da177e4 LT	402	#endif /* __ARCH_WANT_STAT64 */
1da177e4 LT	403
b462707e DM	404	/* Caller is here responsible for sufficient locking (ie. inode->i_lock) */
b462707e DM	405	void __inode_add_bytes(struct inode *inode, loff_t bytes)
1da177e4	406	{
1da177e4 LT	407	inode->i_blocks += bytes >> 9;
	408	bytes &= 511;
	409	inode->i_bytes += bytes;
	410	if (inode->i_bytes >= 512) {
	411	inode->i_blocks++;
	412	inode->i_bytes -= 512;
	413	}
b462707e DM	414	}
	415
	416	void inode_add_bytes(struct inode *inode, loff_t bytes)
	417	{
	418	spin_lock(&inode->i_lock);
	419	__inode_add_bytes(inode, bytes);
1da177e4 LT	420	spin_unlock(&inode->i_lock);
	421	}
	422
	423	EXPORT_SYMBOL(inode_add_bytes);
	424
	425	void inode_sub_bytes(struct inode *inode, loff_t bytes)
	426	{
	427	spin_lock(&inode->i_lock);
	428	inode->i_blocks -= bytes >> 9;
	429	bytes &= 511;
	430	if (inode->i_bytes < bytes) {
	431	inode->i_blocks--;
	432	inode->i_bytes += 512;
	433	}
	434	inode->i_bytes -= bytes;
	435	spin_unlock(&inode->i_lock);
	436	}
	437
	438	EXPORT_SYMBOL(inode_sub_bytes);
	439
	440	loff_t inode_get_bytes(struct inode *inode)
	441	{
	442	loff_t ret;
	443
	444	spin_lock(&inode->i_lock);
	445	ret = (((loff_t)inode->i_blocks) << 9) + inode->i_bytes;
	446	spin_unlock(&inode->i_lock);
	447	return ret;
	448	}
	449
	450	EXPORT_SYMBOL(inode_get_bytes);
	451
	452	void inode_set_bytes(struct inode *inode, loff_t bytes)
	453	{
	454	/* Caller is here responsible for sufficient locking
	455	* (ie. inode->i_lock) */
	456	inode->i_blocks = bytes >> 9;
	457	inode->i_bytes = bytes & 511;
	458	}
	459
	460	EXPORT_SYMBOL(inode_set_bytes);