[linux-block.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->size = i_size_read(inode);
	stat->atime = inode->i_atime;
	stat->mtime = inode->i_mtime;
	stat->ctime = inode->i_ctime;
	stat->blksize = (1 << inode->i_blkbits);
	stat->blocks = inode->i_blocks;
}

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 |
		      AT_EMPTY_PATH)) != 0)
		goto out;

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

	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, LOOKUP_EMPTY, &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
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;
3ddcd056	30	stat->size = i_size_read(inode);
1da177e4 LT	31	stat->atime = inode->i_atime;
	32	stat->mtime = inode->i_mtime;
	33	stat->ctime = inode->i_ctime;
ba52de12	34	stat->blksize = (1 << inode->i_blkbits);
3ddcd056	35	stat->blocks = inode->i_blocks;
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
c7887325 DH	71	int vfs_fstatat(int dfd, const char __user filename, struct kstat stat,
c7887325 DH	72	int flag)
0112fc22	73	{
2eae7a18	74	struct path path;
0112fc22	75	int error = -EINVAL;
2eae7a18	76	int lookup_flags = 0;
0112fc22	77
65cfc672 AV	78	if ((flag & ~(AT_SYMLINK_NOFOLLOW \| AT_NO_AUTOMOUNT \|
65cfc672 AV	79	AT_EMPTY_PATH)) != 0)
0112fc22 OD	80	goto out;
0112fc22 OD	81
2eae7a18 CH	82	if (!(flag & AT_SYMLINK_NOFOLLOW))
2eae7a18 CH	83	lookup_flags \|= LOOKUP_FOLLOW;
65cfc672 AV	84	if (flag & AT_EMPTY_PATH)
65cfc672 AV	85	lookup_flags \|= LOOKUP_EMPTY;
2eae7a18 CH	86
	87	error = user_path_at(dfd, filename, lookup_flags, &path);
	88	if (error)
	89	goto out;
	90
	91	error = vfs_getattr(path.mnt, path.dentry, stat);
	92	path_put(&path);
0112fc22 OD	93	out:
	94	return error;
	95	}
0112fc22 OD	96	EXPORT_SYMBOL(vfs_fstatat);
0112fc22 OD	97
c7887325	98	int vfs_stat(const char __user name, struct kstat stat)
2eae7a18 CH	99	{
	100	return vfs_fstatat(AT_FDCWD, name, stat, 0);
	101	}
	102	EXPORT_SYMBOL(vfs_stat);
	103
c7887325	104	int vfs_lstat(const char __user name, struct kstat stat)
2eae7a18 CH	105	{
	106	return vfs_fstatat(AT_FDCWD, name, stat, AT_SYMLINK_NOFOLLOW);
	107	}
	108	EXPORT_SYMBOL(vfs_lstat);
	109
0112fc22	110
1da177e4 LT	111	#ifdef __ARCH_WANT_OLD_STAT
	112
	113	/*
	114	* For backward compatibility? Maybe this should be moved
	115	* into arch/i386 instead?
	116	*/
	117	static int cp_old_stat(struct kstat stat, struct __old_kernel_stat __user statbuf)
	118	{
	119	static int warncount = 5;
	120	struct __old_kernel_stat tmp;
	121
	122	if (warncount > 0) {
	123	warncount--;
	124	printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n",
	125	current->comm);
	126	} else if (warncount < 0) {
	127	/* it's laughable, but... */
	128	warncount = 0;
	129	}
	130
	131	memset(&tmp, 0, sizeof(struct __old_kernel_stat));
	132	tmp.st_dev = old_encode_dev(stat->dev);
	133	tmp.st_ino = stat->ino;
afefdbb2 DH	134	if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
afefdbb2 DH	135	return -EOVERFLOW;
1da177e4 LT	136	tmp.st_mode = stat->mode;
	137	tmp.st_nlink = stat->nlink;
	138	if (tmp.st_nlink != stat->nlink)
	139	return -EOVERFLOW;
	140	SET_UID(tmp.st_uid, stat->uid);
	141	SET_GID(tmp.st_gid, stat->gid);
	142	tmp.st_rdev = old_encode_dev(stat->rdev);
	143	#if BITS_PER_LONG == 32
	144	if (stat->size > MAX_NON_LFS)
	145	return -EOVERFLOW;
	146	#endif
	147	tmp.st_size = stat->size;
	148	tmp.st_atime = stat->atime.tv_sec;
	149	tmp.st_mtime = stat->mtime.tv_sec;
	150	tmp.st_ctime = stat->ctime.tv_sec;
	151	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
	152	}
	153
c7887325 DH	154	SYSCALL_DEFINE2(stat, const char __user *, filename,
c7887325 DH	155	struct __old_kernel_stat __user *, statbuf)
1da177e4 LT	156	{
1da177e4 LT	157	struct kstat stat;
2eae7a18	158	int error;
1da177e4	159
2eae7a18 CH	160	error = vfs_stat(filename, &stat);
	161	if (error)
	162	return error;
1da177e4	163
2eae7a18	164	return cp_old_stat(&stat, statbuf);
1da177e4	165	}
257ac264	166
c7887325 DH	167	SYSCALL_DEFINE2(lstat, const char __user *, filename,
c7887325 DH	168	struct __old_kernel_stat __user *, statbuf)
1da177e4 LT	169	{
1da177e4 LT	170	struct kstat stat;
2eae7a18	171	int error;
1da177e4	172
2eae7a18 CH	173	error = vfs_lstat(filename, &stat);
	174	if (error)
	175	return error;
1da177e4	176
2eae7a18	177	return cp_old_stat(&stat, statbuf);
1da177e4	178	}
257ac264 HC	179
257ac264 HC	180	SYSCALL_DEFINE2(fstat, unsigned int, fd, struct __old_kernel_stat __user *, statbuf)
1da177e4 LT	181	{
	182	struct kstat stat;
	183	int error = vfs_fstat(fd, &stat);
	184
	185	if (!error)
	186	error = cp_old_stat(&stat, statbuf);
	187
	188	return error;
	189	}
	190
	191	#endif /* __ARCH_WANT_OLD_STAT */
	192
	193	static int cp_new_stat(struct kstat stat, struct stat __user statbuf)
	194	{
	195	struct stat tmp;
	196
	197	#if BITS_PER_LONG == 32
	198	if (!old_valid_dev(stat->dev) \|\| !old_valid_dev(stat->rdev))
	199	return -EOVERFLOW;
	200	#else
	201	if (!new_valid_dev(stat->dev) \|\| !new_valid_dev(stat->rdev))
	202	return -EOVERFLOW;
	203	#endif
	204
	205	memset(&tmp, 0, sizeof(tmp));
	206	#if BITS_PER_LONG == 32
	207	tmp.st_dev = old_encode_dev(stat->dev);
	208	#else
	209	tmp.st_dev = new_encode_dev(stat->dev);
	210	#endif
	211	tmp.st_ino = stat->ino;
afefdbb2 DH	212	if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
afefdbb2 DH	213	return -EOVERFLOW;
1da177e4 LT	214	tmp.st_mode = stat->mode;
	215	tmp.st_nlink = stat->nlink;
	216	if (tmp.st_nlink != stat->nlink)
	217	return -EOVERFLOW;
	218	SET_UID(tmp.st_uid, stat->uid);
	219	SET_GID(tmp.st_gid, stat->gid);
	220	#if BITS_PER_LONG == 32
	221	tmp.st_rdev = old_encode_dev(stat->rdev);
	222	#else
	223	tmp.st_rdev = new_encode_dev(stat->rdev);
	224	#endif
	225	#if BITS_PER_LONG == 32
	226	if (stat->size > MAX_NON_LFS)
	227	return -EOVERFLOW;
	228	#endif
	229	tmp.st_size = stat->size;
	230	tmp.st_atime = stat->atime.tv_sec;
	231	tmp.st_mtime = stat->mtime.tv_sec;
	232	tmp.st_ctime = stat->ctime.tv_sec;
	233	#ifdef STAT_HAVE_NSEC
	234	tmp.st_atime_nsec = stat->atime.tv_nsec;
	235	tmp.st_mtime_nsec = stat->mtime.tv_nsec;
	236	tmp.st_ctime_nsec = stat->ctime.tv_nsec;
	237	#endif
	238	tmp.st_blocks = stat->blocks;
	239	tmp.st_blksize = stat->blksize;
	240	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
	241	}
	242
c7887325 DH	243	SYSCALL_DEFINE2(newstat, const char __user *, filename,
c7887325 DH	244	struct stat __user *, statbuf)
5590ff0d UD	245	{
5590ff0d UD	246	struct kstat stat;
2eae7a18	247	int error = vfs_stat(filename, &stat);
5590ff0d	248
2eae7a18 CH	249	if (error)
	250	return error;
	251	return cp_new_stat(&stat, statbuf);
5590ff0d UD	252	}
5590ff0d UD	253
c7887325 DH	254	SYSCALL_DEFINE2(newlstat, const char __user *, filename,
c7887325 DH	255	struct stat __user *, statbuf)
1da177e4 LT	256	{
1da177e4 LT	257	struct kstat stat;
2eae7a18	258	int error;
1da177e4	259
2eae7a18 CH	260	error = vfs_lstat(filename, &stat);
	261	if (error)
	262	return error;
1da177e4	263
2eae7a18	264	return cp_new_stat(&stat, statbuf);
1da177e4	265	}
5590ff0d	266
2833c28a	267	#if !defined(__ARCH_WANT_STAT64) \|\| defined(__ARCH_WANT_SYS_NEWFSTATAT)
c7887325	268	SYSCALL_DEFINE4(newfstatat, int, dfd, const char __user *, filename,
6559eed8	269	struct stat __user *, statbuf, int, flag)
1da177e4 LT	270	{
1da177e4 LT	271	struct kstat stat;
0112fc22	272	int error;
1da177e4	273
0112fc22 OD	274	error = vfs_fstatat(dfd, filename, &stat, flag);
	275	if (error)
	276	return error;
	277	return cp_new_stat(&stat, statbuf);
1da177e4	278	}
cff2b760	279	#endif
5590ff0d	280
257ac264	281	SYSCALL_DEFINE2(newfstat, unsigned int, fd, struct stat __user *, statbuf)
1da177e4 LT	282	{
	283	struct kstat stat;
	284	int error = vfs_fstat(fd, &stat);
	285
	286	if (!error)
	287	error = cp_new_stat(&stat, statbuf);
	288
	289	return error;
	290	}
	291
6559eed8 HC	292	SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname,
6559eed8 HC	293	char __user *, buf, int, bufsiz)
1da177e4	294	{
2d8f3038	295	struct path path;
1da177e4 LT	296	int error;
	297
	298	if (bufsiz <= 0)
	299	return -EINVAL;
	300
65cfc672	301	error = user_path_at(dfd, pathname, LOOKUP_EMPTY, &path);
1da177e4	302	if (!error) {
2d8f3038	303	struct inode *inode = path.dentry->d_inode;
1da177e4 LT	304
1da177e4 LT	305	error = -EINVAL;
acfa4380	306	if (inode->i_op->readlink) {
2d8f3038	307	error = security_inode_readlink(path.dentry);
1da177e4	308	if (!error) {
2d8f3038 AV	309	touch_atime(path.mnt, path.dentry);
2d8f3038 AV	310	error = inode->i_op->readlink(path.dentry,
4ac91378	311	buf, bufsiz);
1da177e4 LT	312	}
1da177e4 LT	313	}
2d8f3038	314	path_put(&path);
1da177e4 LT	315	}
	316	return error;
	317	}
	318
002c8976 HC	319	SYSCALL_DEFINE3(readlink, const char __user , path, char __user , buf,
002c8976 HC	320	int, bufsiz)
5590ff0d UD	321	{
	322	return sys_readlinkat(AT_FDCWD, path, buf, bufsiz);
	323	}
	324
1da177e4 LT	325
	326	/* ---------- LFS-64 ----------- */
	327	#ifdef __ARCH_WANT_STAT64
	328
	329	static long cp_new_stat64(struct kstat stat, struct stat64 __user statbuf)
	330	{
	331	struct stat64 tmp;
	332
	333	memset(&tmp, 0, sizeof(struct stat64));
	334	#ifdef CONFIG_MIPS
	335	/* mips has weird padding, so we don't get 64 bits there */
	336	if (!new_valid_dev(stat->dev) \|\| !new_valid_dev(stat->rdev))
	337	return -EOVERFLOW;
	338	tmp.st_dev = new_encode_dev(stat->dev);
	339	tmp.st_rdev = new_encode_dev(stat->rdev);
	340	#else
	341	tmp.st_dev = huge_encode_dev(stat->dev);
	342	tmp.st_rdev = huge_encode_dev(stat->rdev);
	343	#endif
	344	tmp.st_ino = stat->ino;
afefdbb2 DH	345	if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
afefdbb2 DH	346	return -EOVERFLOW;
1da177e4 LT	347	#ifdef STAT64_HAS_BROKEN_ST_INO
	348	tmp.__st_ino = stat->ino;
	349	#endif
	350	tmp.st_mode = stat->mode;
	351	tmp.st_nlink = stat->nlink;
	352	tmp.st_uid = stat->uid;
	353	tmp.st_gid = stat->gid;
	354	tmp.st_atime = stat->atime.tv_sec;
	355	tmp.st_atime_nsec = stat->atime.tv_nsec;
	356	tmp.st_mtime = stat->mtime.tv_sec;
	357	tmp.st_mtime_nsec = stat->mtime.tv_nsec;
	358	tmp.st_ctime = stat->ctime.tv_sec;
	359	tmp.st_ctime_nsec = stat->ctime.tv_nsec;
	360	tmp.st_size = stat->size;
	361	tmp.st_blocks = stat->blocks;
	362	tmp.st_blksize = stat->blksize;
	363	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
	364	}
	365
c7887325 DH	366	SYSCALL_DEFINE2(stat64, const char __user *, filename,
c7887325 DH	367	struct stat64 __user *, statbuf)
1da177e4 LT	368	{
	369	struct kstat stat;
	370	int error = vfs_stat(filename, &stat);
	371
	372	if (!error)
	373	error = cp_new_stat64(&stat, statbuf);
	374
	375	return error;
	376	}
257ac264	377
c7887325 DH	378	SYSCALL_DEFINE2(lstat64, const char __user *, filename,
c7887325 DH	379	struct stat64 __user *, statbuf)
1da177e4 LT	380	{
	381	struct kstat stat;
	382	int error = vfs_lstat(filename, &stat);
	383
	384	if (!error)
	385	error = cp_new_stat64(&stat, statbuf);
	386
	387	return error;
	388	}
257ac264 HC	389
257ac264 HC	390	SYSCALL_DEFINE2(fstat64, unsigned long, fd, struct stat64 __user *, statbuf)
1da177e4 LT	391	{
	392	struct kstat stat;
	393	int error = vfs_fstat(fd, &stat);
	394
	395	if (!error)
	396	error = cp_new_stat64(&stat, statbuf);
	397
	398	return error;
	399	}
	400
c7887325	401	SYSCALL_DEFINE4(fstatat64, int, dfd, const char __user *, filename,
6559eed8	402	struct stat64 __user *, statbuf, int, flag)
cff2b760 UD	403	{
cff2b760 UD	404	struct kstat stat;
0112fc22	405	int error;
cff2b760	406
0112fc22 OD	407	error = vfs_fstatat(dfd, filename, &stat, flag);
	408	if (error)
	409	return error;
	410	return cp_new_stat64(&stat, statbuf);
cff2b760	411	}
1da177e4 LT	412	#endif /* __ARCH_WANT_STAT64 */
1da177e4 LT	413
b462707e DM	414	/* Caller is here responsible for sufficient locking (ie. inode->i_lock) */
b462707e DM	415	void __inode_add_bytes(struct inode *inode, loff_t bytes)
1da177e4	416	{
1da177e4 LT	417	inode->i_blocks += bytes >> 9;
	418	bytes &= 511;
	419	inode->i_bytes += bytes;
	420	if (inode->i_bytes >= 512) {
	421	inode->i_blocks++;
	422	inode->i_bytes -= 512;
	423	}
b462707e DM	424	}
	425
	426	void inode_add_bytes(struct inode *inode, loff_t bytes)
	427	{
	428	spin_lock(&inode->i_lock);
	429	__inode_add_bytes(inode, bytes);
1da177e4 LT	430	spin_unlock(&inode->i_lock);
	431	}
	432
	433	EXPORT_SYMBOL(inode_add_bytes);
	434
	435	void inode_sub_bytes(struct inode *inode, loff_t bytes)
	436	{
	437	spin_lock(&inode->i_lock);
	438	inode->i_blocks -= bytes >> 9;
	439	bytes &= 511;
	440	if (inode->i_bytes < bytes) {
	441	inode->i_blocks--;
	442	inode->i_bytes += 512;
	443	}
	444	inode->i_bytes -= bytes;
	445	spin_unlock(&inode->i_lock);
	446	}
	447
	448	EXPORT_SYMBOL(inode_sub_bytes);
	449
	450	loff_t inode_get_bytes(struct inode *inode)
	451	{
	452	loff_t ret;
	453
	454	spin_lock(&inode->i_lock);
	455	ret = (((loff_t)inode->i_blocks) << 9) + inode->i_bytes;
	456	spin_unlock(&inode->i_lock);
	457	return ret;
	458	}
	459
	460	EXPORT_SYMBOL(inode_get_bytes);
	461
	462	void inode_set_bytes(struct inode *inode, loff_t bytes)
	463	{
	464	/* Caller is here responsible for sufficient locking
	465	* (ie. inode->i_lock) */
	466	inode->i_blocks = bytes >> 9;
	467	inode->i_bytes = bytes & 511;
	468	}
	469
	470	EXPORT_SYMBOL(inode_set_bytes);