[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 |
		      AT_EMPTY_PATH)) != 0)
		goto out;

	if (!(flag & AT_SYMLINK_NOFOLLOW))
		lookup_flags |= LOOKUP_FOLLOW;
	if (flag & AT_NO_AUTOMOUNT)
		lookup_flags |= LOOKUP_NO_AUTOMOUNT;
	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;
	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
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;
6f45b656 DH	84	if (flag & AT_NO_AUTOMOUNT)
6f45b656 DH	85	lookup_flags \|= LOOKUP_NO_AUTOMOUNT;
65cfc672 AV	86	if (flag & AT_EMPTY_PATH)
65cfc672 AV	87	lookup_flags \|= LOOKUP_EMPTY;
2eae7a18 CH	88
	89	error = user_path_at(dfd, filename, lookup_flags, &path);
	90	if (error)
	91	goto out;
	92
	93	error = vfs_getattr(path.mnt, path.dentry, stat);
	94	path_put(&path);
0112fc22 OD	95	out:
	96	return error;
	97	}
0112fc22 OD	98	EXPORT_SYMBOL(vfs_fstatat);
0112fc22 OD	99
c7887325	100	int vfs_stat(const char __user name, struct kstat stat)
2eae7a18 CH	101	{
	102	return vfs_fstatat(AT_FDCWD, name, stat, 0);
	103	}
	104	EXPORT_SYMBOL(vfs_stat);
	105
c7887325	106	int vfs_lstat(const char __user name, struct kstat stat)
2eae7a18 CH	107	{
	108	return vfs_fstatat(AT_FDCWD, name, stat, AT_SYMLINK_NOFOLLOW);
	109	}
	110	EXPORT_SYMBOL(vfs_lstat);
	111
0112fc22	112
1da177e4 LT	113	#ifdef __ARCH_WANT_OLD_STAT
	114
	115	/*
	116	* For backward compatibility? Maybe this should be moved
	117	* into arch/i386 instead?
	118	*/
	119	static int cp_old_stat(struct kstat stat, struct __old_kernel_stat __user statbuf)
	120	{
	121	static int warncount = 5;
	122	struct __old_kernel_stat tmp;
	123
	124	if (warncount > 0) {
	125	warncount--;
	126	printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n",
	127	current->comm);
	128	} else if (warncount < 0) {
	129	/* it's laughable, but... */
	130	warncount = 0;
	131	}
	132
	133	memset(&tmp, 0, sizeof(struct __old_kernel_stat));
	134	tmp.st_dev = old_encode_dev(stat->dev);
	135	tmp.st_ino = stat->ino;
afefdbb2 DH	136	if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
afefdbb2 DH	137	return -EOVERFLOW;
1da177e4 LT	138	tmp.st_mode = stat->mode;
	139	tmp.st_nlink = stat->nlink;
	140	if (tmp.st_nlink != stat->nlink)
	141	return -EOVERFLOW;
	142	SET_UID(tmp.st_uid, stat->uid);
	143	SET_GID(tmp.st_gid, stat->gid);
	144	tmp.st_rdev = old_encode_dev(stat->rdev);
	145	#if BITS_PER_LONG == 32
	146	if (stat->size > MAX_NON_LFS)
	147	return -EOVERFLOW;
	148	#endif
	149	tmp.st_size = stat->size;
	150	tmp.st_atime = stat->atime.tv_sec;
	151	tmp.st_mtime = stat->mtime.tv_sec;
	152	tmp.st_ctime = stat->ctime.tv_sec;
	153	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
	154	}
	155
c7887325 DH	156	SYSCALL_DEFINE2(stat, const char __user *, filename,
c7887325 DH	157	struct __old_kernel_stat __user *, statbuf)
1da177e4 LT	158	{
1da177e4 LT	159	struct kstat stat;
2eae7a18	160	int error;
1da177e4	161
2eae7a18 CH	162	error = vfs_stat(filename, &stat);
	163	if (error)
	164	return error;
1da177e4	165
2eae7a18	166	return cp_old_stat(&stat, statbuf);
1da177e4	167	}
257ac264	168
c7887325 DH	169	SYSCALL_DEFINE2(lstat, const char __user *, filename,
c7887325 DH	170	struct __old_kernel_stat __user *, statbuf)
1da177e4 LT	171	{
1da177e4 LT	172	struct kstat stat;
2eae7a18	173	int error;
1da177e4	174
2eae7a18 CH	175	error = vfs_lstat(filename, &stat);
	176	if (error)
	177	return error;
1da177e4	178
2eae7a18	179	return cp_old_stat(&stat, statbuf);
1da177e4	180	}
257ac264 HC	181
257ac264 HC	182	SYSCALL_DEFINE2(fstat, unsigned int, fd, struct __old_kernel_stat __user *, statbuf)
1da177e4 LT	183	{
	184	struct kstat stat;
	185	int error = vfs_fstat(fd, &stat);
	186
	187	if (!error)
	188	error = cp_old_stat(&stat, statbuf);
	189
	190	return error;
	191	}
	192
	193	#endif /* __ARCH_WANT_OLD_STAT */
	194
	195	static int cp_new_stat(struct kstat stat, struct stat __user statbuf)
	196	{
	197	struct stat tmp;
	198
	199	#if BITS_PER_LONG == 32
	200	if (!old_valid_dev(stat->dev) \|\| !old_valid_dev(stat->rdev))
	201	return -EOVERFLOW;
	202	#else
	203	if (!new_valid_dev(stat->dev) \|\| !new_valid_dev(stat->rdev))
	204	return -EOVERFLOW;
	205	#endif
	206
	207	memset(&tmp, 0, sizeof(tmp));
	208	#if BITS_PER_LONG == 32
	209	tmp.st_dev = old_encode_dev(stat->dev);
	210	#else
	211	tmp.st_dev = new_encode_dev(stat->dev);
	212	#endif
	213	tmp.st_ino = stat->ino;
afefdbb2 DH	214	if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
afefdbb2 DH	215	return -EOVERFLOW;
1da177e4 LT	216	tmp.st_mode = stat->mode;
	217	tmp.st_nlink = stat->nlink;
	218	if (tmp.st_nlink != stat->nlink)
	219	return -EOVERFLOW;
	220	SET_UID(tmp.st_uid, stat->uid);
	221	SET_GID(tmp.st_gid, stat->gid);
	222	#if BITS_PER_LONG == 32
	223	tmp.st_rdev = old_encode_dev(stat->rdev);
	224	#else
	225	tmp.st_rdev = new_encode_dev(stat->rdev);
	226	#endif
	227	#if BITS_PER_LONG == 32
	228	if (stat->size > MAX_NON_LFS)
	229	return -EOVERFLOW;
	230	#endif
	231	tmp.st_size = stat->size;
	232	tmp.st_atime = stat->atime.tv_sec;
	233	tmp.st_mtime = stat->mtime.tv_sec;
	234	tmp.st_ctime = stat->ctime.tv_sec;
	235	#ifdef STAT_HAVE_NSEC
	236	tmp.st_atime_nsec = stat->atime.tv_nsec;
	237	tmp.st_mtime_nsec = stat->mtime.tv_nsec;
	238	tmp.st_ctime_nsec = stat->ctime.tv_nsec;
	239	#endif
	240	tmp.st_blocks = stat->blocks;
	241	tmp.st_blksize = stat->blksize;
	242	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
	243	}
	244
c7887325 DH	245	SYSCALL_DEFINE2(newstat, const char __user *, filename,
c7887325 DH	246	struct stat __user *, statbuf)
5590ff0d UD	247	{
5590ff0d UD	248	struct kstat stat;
2eae7a18	249	int error = vfs_stat(filename, &stat);
5590ff0d	250
2eae7a18 CH	251	if (error)
	252	return error;
	253	return cp_new_stat(&stat, statbuf);
5590ff0d UD	254	}
5590ff0d UD	255
c7887325 DH	256	SYSCALL_DEFINE2(newlstat, const char __user *, filename,
c7887325 DH	257	struct stat __user *, statbuf)
1da177e4 LT	258	{
1da177e4 LT	259	struct kstat stat;
2eae7a18	260	int error;
1da177e4	261
2eae7a18 CH	262	error = vfs_lstat(filename, &stat);
	263	if (error)
	264	return error;
1da177e4	265
2eae7a18	266	return cp_new_stat(&stat, statbuf);
1da177e4	267	}
5590ff0d	268
2833c28a	269	#if !defined(__ARCH_WANT_STAT64) \|\| defined(__ARCH_WANT_SYS_NEWFSTATAT)
c7887325	270	SYSCALL_DEFINE4(newfstatat, int, dfd, const char __user *, filename,
6559eed8	271	struct stat __user *, statbuf, int, flag)
1da177e4 LT	272	{
1da177e4 LT	273	struct kstat stat;
0112fc22	274	int error;
1da177e4	275
0112fc22 OD	276	error = vfs_fstatat(dfd, filename, &stat, flag);
	277	if (error)
	278	return error;
	279	return cp_new_stat(&stat, statbuf);
1da177e4	280	}
cff2b760	281	#endif
5590ff0d	282
257ac264	283	SYSCALL_DEFINE2(newfstat, unsigned int, fd, struct stat __user *, statbuf)
1da177e4 LT	284	{
	285	struct kstat stat;
	286	int error = vfs_fstat(fd, &stat);
	287
	288	if (!error)
	289	error = cp_new_stat(&stat, statbuf);
	290
	291	return error;
	292	}
	293
6559eed8 HC	294	SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname,
6559eed8 HC	295	char __user *, buf, int, bufsiz)
1da177e4	296	{
2d8f3038	297	struct path path;
1da177e4 LT	298	int error;
	299
	300	if (bufsiz <= 0)
	301	return -EINVAL;
	302
65cfc672	303	error = user_path_at(dfd, pathname, LOOKUP_EMPTY, &path);
1da177e4	304	if (!error) {
2d8f3038	305	struct inode *inode = path.dentry->d_inode;
1da177e4 LT	306
1da177e4 LT	307	error = -EINVAL;
acfa4380	308	if (inode->i_op->readlink) {
2d8f3038	309	error = security_inode_readlink(path.dentry);
1da177e4	310	if (!error) {
2d8f3038 AV	311	touch_atime(path.mnt, path.dentry);
2d8f3038 AV	312	error = inode->i_op->readlink(path.dentry,
4ac91378	313	buf, bufsiz);
1da177e4 LT	314	}
1da177e4 LT	315	}
2d8f3038	316	path_put(&path);
1da177e4 LT	317	}
	318	return error;
	319	}
	320
002c8976 HC	321	SYSCALL_DEFINE3(readlink, const char __user , path, char __user , buf,
002c8976 HC	322	int, bufsiz)
5590ff0d UD	323	{
	324	return sys_readlinkat(AT_FDCWD, path, buf, bufsiz);
	325	}
	326
1da177e4 LT	327
	328	/* ---------- LFS-64 ----------- */
	329	#ifdef __ARCH_WANT_STAT64
	330
	331	static long cp_new_stat64(struct kstat stat, struct stat64 __user statbuf)
	332	{
	333	struct stat64 tmp;
	334
	335	memset(&tmp, 0, sizeof(struct stat64));
	336	#ifdef CONFIG_MIPS
	337	/* mips has weird padding, so we don't get 64 bits there */
	338	if (!new_valid_dev(stat->dev) \|\| !new_valid_dev(stat->rdev))
	339	return -EOVERFLOW;
	340	tmp.st_dev = new_encode_dev(stat->dev);
	341	tmp.st_rdev = new_encode_dev(stat->rdev);
	342	#else
	343	tmp.st_dev = huge_encode_dev(stat->dev);
	344	tmp.st_rdev = huge_encode_dev(stat->rdev);
	345	#endif
	346	tmp.st_ino = stat->ino;
afefdbb2 DH	347	if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
afefdbb2 DH	348	return -EOVERFLOW;
1da177e4 LT	349	#ifdef STAT64_HAS_BROKEN_ST_INO
	350	tmp.__st_ino = stat->ino;
	351	#endif
	352	tmp.st_mode = stat->mode;
	353	tmp.st_nlink = stat->nlink;
	354	tmp.st_uid = stat->uid;
	355	tmp.st_gid = stat->gid;
	356	tmp.st_atime = stat->atime.tv_sec;
	357	tmp.st_atime_nsec = stat->atime.tv_nsec;
	358	tmp.st_mtime = stat->mtime.tv_sec;
	359	tmp.st_mtime_nsec = stat->mtime.tv_nsec;
	360	tmp.st_ctime = stat->ctime.tv_sec;
	361	tmp.st_ctime_nsec = stat->ctime.tv_nsec;
	362	tmp.st_size = stat->size;
	363	tmp.st_blocks = stat->blocks;
	364	tmp.st_blksize = stat->blksize;
	365	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
	366	}
	367
c7887325 DH	368	SYSCALL_DEFINE2(stat64, const char __user *, filename,
c7887325 DH	369	struct stat64 __user *, statbuf)
1da177e4 LT	370	{
	371	struct kstat stat;
	372	int error = vfs_stat(filename, &stat);
	373
	374	if (!error)
	375	error = cp_new_stat64(&stat, statbuf);
	376
	377	return error;
	378	}
257ac264	379
c7887325 DH	380	SYSCALL_DEFINE2(lstat64, const char __user *, filename,
c7887325 DH	381	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
c7887325	403	SYSCALL_DEFINE4(fstatat64, int, dfd, const char __user *, filename,
6559eed8	404	struct stat64 __user *, statbuf, int, flag)
cff2b760 UD	405	{
cff2b760 UD	406	struct kstat stat;
0112fc22	407	int error;
cff2b760	408
0112fc22 OD	409	error = vfs_fstatat(dfd, filename, &stat, flag);
	410	if (error)
	411	return error;
	412	return cp_new_stat64(&stat, statbuf);
cff2b760	413	}
1da177e4 LT	414	#endif /* __ARCH_WANT_STAT64 */
1da177e4 LT	415
b462707e DM	416	/* Caller is here responsible for sufficient locking (ie. inode->i_lock) */
b462707e DM	417	void __inode_add_bytes(struct inode *inode, loff_t bytes)
1da177e4	418	{
1da177e4 LT	419	inode->i_blocks += bytes >> 9;
	420	bytes &= 511;
	421	inode->i_bytes += bytes;
	422	if (inode->i_bytes >= 512) {
	423	inode->i_blocks++;
	424	inode->i_bytes -= 512;
	425	}
b462707e DM	426	}
	427
	428	void inode_add_bytes(struct inode *inode, loff_t bytes)
	429	{
	430	spin_lock(&inode->i_lock);
	431	__inode_add_bytes(inode, bytes);
1da177e4 LT	432	spin_unlock(&inode->i_lock);
	433	}
	434
	435	EXPORT_SYMBOL(inode_add_bytes);
	436
	437	void inode_sub_bytes(struct inode *inode, loff_t bytes)
	438	{
	439	spin_lock(&inode->i_lock);
	440	inode->i_blocks -= bytes >> 9;
	441	bytes &= 511;
	442	if (inode->i_bytes < bytes) {
	443	inode->i_blocks--;
	444	inode->i_bytes += 512;
	445	}
	446	inode->i_bytes -= bytes;
	447	spin_unlock(&inode->i_lock);
	448	}
	449
	450	EXPORT_SYMBOL(inode_sub_bytes);
	451
	452	loff_t inode_get_bytes(struct inode *inode)
	453	{
	454	loff_t ret;
	455
	456	spin_lock(&inode->i_lock);
	457	ret = (((loff_t)inode->i_blocks) << 9) + inode->i_bytes;
	458	spin_unlock(&inode->i_lock);
	459	return ret;
	460	}
	461
	462	EXPORT_SYMBOL(inode_get_bytes);
	463
	464	void inode_set_bytes(struct inode *inode, loff_t bytes)
	465	{
	466	/* Caller is here responsible for sufficient locking
	467	* (ie. inode->i_lock) */
	468	inode->i_blocks = bytes >> 9;
	469	inode->i_bytes = bytes & 511;
	470	}
	471
	472	EXPORT_SYMBOL(inode_set_bytes);