[deliverable/linux.git] / fs / stat.c

/*
 *  linux/fs/stat.c
 *
 *  Copyright (C) 1991, 1992  Linus Torvalds
 */

#include <linux/module.h>
#include <linux/mm.h>
#include <linux/errno.h>
#include <linux/file.h>
#include <linux/smp_lock.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);
	if (!stat->blksize) {
		struct super_block *s = inode->i_sb;
		unsigned blocks;
		blocks = (stat->size+s->s_blocksize-1) >> s->s_blocksize_bits;
		stat->blocks = (s->s_blocksize / 512) * blocks;
		stat->blksize = s->s_blocksize;
	}
	return 0;
}

EXPORT_SYMBOL(vfs_getattr);

int vfs_stat_fd(int dfd, char __user *name, struct kstat *stat)
{
	struct nameidata nd;
	int error;

	error = __user_walk_fd(dfd, name, LOOKUP_FOLLOW, &nd);
	if (!error) {
		error = vfs_getattr(nd.mnt, nd.dentry, stat);
		path_release(&nd);
	}
	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 nameidata nd;
	int error;

	error = __user_walk_fd(dfd, name, 0, &nd);
	if (!error) {
		error = vfs_getattr(nd.mnt, nd.dentry, stat);
		path_release(&nd);
	}
	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_vfsmnt, f->f_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;
}

asmlinkage long sys_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;
}
asmlinkage long sys_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;
}
asmlinkage long sys_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;
}

asmlinkage long sys_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;
}

asmlinkage long sys_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)
asmlinkage long sys_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

asmlinkage long sys_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;
}

asmlinkage long sys_readlinkat(int dfd, const char __user *path,
				char __user *buf, int bufsiz)
{
	struct nameidata nd;
	int error;

	if (bufsiz <= 0)
		return -EINVAL;

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

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

asmlinkage long sys_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;
}

asmlinkage long sys_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;
}
asmlinkage long sys_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;
}
asmlinkage long sys_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;
}

asmlinkage long sys_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>
	11	#include <linux/smp_lock.h>
	12	#include <linux/highuid.h>
	13	#include <linux/fs.h>
	14	#include <linux/namei.h>
	15	#include <linux/security.h>
	16	#include <linux/syscalls.h>
ba52de12	17	#include <linux/pagemap.h>
1da177e4 LT	18
	19	#include <asm/uaccess.h>
	20	#include <asm/unistd.h>
	21
	22	void generic_fillattr(struct inode inode, struct kstat stat)
	23	{
	24	stat->dev = inode->i_sb->s_dev;
	25	stat->ino = inode->i_ino;
	26	stat->mode = inode->i_mode;
	27	stat->nlink = inode->i_nlink;
	28	stat->uid = inode->i_uid;
	29	stat->gid = inode->i_gid;
	30	stat->rdev = inode->i_rdev;
	31	stat->atime = inode->i_atime;
	32	stat->mtime = inode->i_mtime;
	33	stat->ctime = inode->i_ctime;
	34	stat->size = i_size_read(inode);
	35	stat->blocks = inode->i_blocks;
ba52de12	36	stat->blksize = (1 << inode->i_blkbits);
1da177e4 LT	37	}
	38
	39	EXPORT_SYMBOL(generic_fillattr);
	40
	41	int vfs_getattr(struct vfsmount mnt, struct dentry dentry, struct kstat *stat)
	42	{
	43	struct inode *inode = dentry->d_inode;
	44	int retval;
	45
	46	retval = security_inode_getattr(mnt, dentry);
	47	if (retval)
	48	return retval;
	49
	50	if (inode->i_op->getattr)
	51	return inode->i_op->getattr(mnt, dentry, stat);
	52
	53	generic_fillattr(inode, stat);
	54	if (!stat->blksize) {
	55	struct super_block *s = inode->i_sb;
	56	unsigned blocks;
	57	blocks = (stat->size+s->s_blocksize-1) >> s->s_blocksize_bits;
	58	stat->blocks = (s->s_blocksize / 512) * blocks;
	59	stat->blksize = s->s_blocksize;
	60	}
	61	return 0;
	62	}
	63
	64	EXPORT_SYMBOL(vfs_getattr);
	65
5590ff0d	66	int vfs_stat_fd(int dfd, char __user name, struct kstat stat)
1da177e4 LT	67	{
	68	struct nameidata nd;
	69	int error;
	70
5590ff0d	71	error = __user_walk_fd(dfd, name, LOOKUP_FOLLOW, &nd);
1da177e4 LT	72	if (!error) {
	73	error = vfs_getattr(nd.mnt, nd.dentry, stat);
	74	path_release(&nd);
	75	}
	76	return error;
	77	}
	78
5590ff0d UD	79	int vfs_stat(char __user name, struct kstat stat)
	80	{
	81	return vfs_stat_fd(AT_FDCWD, name, stat);
	82	}
	83
1da177e4 LT	84	EXPORT_SYMBOL(vfs_stat);
1da177e4 LT	85
5590ff0d	86	int vfs_lstat_fd(int dfd, char __user name, struct kstat stat)
1da177e4 LT	87	{
	88	struct nameidata nd;
	89	int error;
	90
5590ff0d	91	error = __user_walk_fd(dfd, name, 0, &nd);
1da177e4 LT	92	if (!error) {
	93	error = vfs_getattr(nd.mnt, nd.dentry, stat);
	94	path_release(&nd);
	95	}
	96	return error;
	97	}
	98
5590ff0d UD	99	int vfs_lstat(char __user name, struct kstat stat)
	100	{
	101	return vfs_lstat_fd(AT_FDCWD, name, stat);
	102	}
	103
1da177e4 LT	104	EXPORT_SYMBOL(vfs_lstat);
	105
	106	int vfs_fstat(unsigned int fd, struct kstat *stat)
	107	{
	108	struct file *f = fget(fd);
	109	int error = -EBADF;
	110
	111	if (f) {
	112	error = vfs_getattr(f->f_vfsmnt, f->f_dentry, stat);
	113	fput(f);
	114	}
	115	return error;
	116	}
	117
	118	EXPORT_SYMBOL(vfs_fstat);
	119
	120	#ifdef __ARCH_WANT_OLD_STAT
	121
	122	/*
	123	* For backward compatibility? Maybe this should be moved
	124	* into arch/i386 instead?
	125	*/
	126	static int cp_old_stat(struct kstat stat, struct __old_kernel_stat __user statbuf)
	127	{
	128	static int warncount = 5;
	129	struct __old_kernel_stat tmp;
	130
	131	if (warncount > 0) {
	132	warncount--;
	133	printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n",
	134	current->comm);
	135	} else if (warncount < 0) {
	136	/* it's laughable, but... */
	137	warncount = 0;
	138	}
	139
	140	memset(&tmp, 0, sizeof(struct __old_kernel_stat));
	141	tmp.st_dev = old_encode_dev(stat->dev);
	142	tmp.st_ino = stat->ino;
afefdbb2 DH	143	if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
afefdbb2 DH	144	return -EOVERFLOW;
1da177e4 LT	145	tmp.st_mode = stat->mode;
	146	tmp.st_nlink = stat->nlink;
	147	if (tmp.st_nlink != stat->nlink)
	148	return -EOVERFLOW;
	149	SET_UID(tmp.st_uid, stat->uid);
	150	SET_GID(tmp.st_gid, stat->gid);
	151	tmp.st_rdev = old_encode_dev(stat->rdev);
	152	#if BITS_PER_LONG == 32
	153	if (stat->size > MAX_NON_LFS)
	154	return -EOVERFLOW;
	155	#endif
	156	tmp.st_size = stat->size;
	157	tmp.st_atime = stat->atime.tv_sec;
	158	tmp.st_mtime = stat->mtime.tv_sec;
	159	tmp.st_ctime = stat->ctime.tv_sec;
	160	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
	161	}
	162
	163	asmlinkage long sys_stat(char __user * filename, struct __old_kernel_stat __user * statbuf)
	164	{
	165	struct kstat stat;
5590ff0d	166	int error = vfs_stat_fd(AT_FDCWD, filename, &stat);
1da177e4 LT	167
	168	if (!error)
	169	error = cp_old_stat(&stat, statbuf);
	170
	171	return error;
	172	}
	173	asmlinkage long sys_lstat(char __user * filename, struct __old_kernel_stat __user * statbuf)
	174	{
	175	struct kstat stat;
5590ff0d	176	int error = vfs_lstat_fd(AT_FDCWD, filename, &stat);
1da177e4 LT	177
	178	if (!error)
	179	error = cp_old_stat(&stat, statbuf);
	180
	181	return error;
	182	}
	183	asmlinkage long sys_fstat(unsigned int fd, struct __old_kernel_stat __user * statbuf)
	184	{
	185	struct kstat stat;
	186	int error = vfs_fstat(fd, &stat);
	187
	188	if (!error)
	189	error = cp_old_stat(&stat, statbuf);
	190
	191	return error;
	192	}
	193
	194	#endif /* __ARCH_WANT_OLD_STAT */
	195
	196	static int cp_new_stat(struct kstat stat, struct stat __user statbuf)
	197	{
	198	struct stat tmp;
	199
	200	#if BITS_PER_LONG == 32
	201	if (!old_valid_dev(stat->dev) \|\| !old_valid_dev(stat->rdev))
	202	return -EOVERFLOW;
	203	#else
	204	if (!new_valid_dev(stat->dev) \|\| !new_valid_dev(stat->rdev))
	205	return -EOVERFLOW;
	206	#endif
	207
	208	memset(&tmp, 0, sizeof(tmp));
	209	#if BITS_PER_LONG == 32
	210	tmp.st_dev = old_encode_dev(stat->dev);
	211	#else
	212	tmp.st_dev = new_encode_dev(stat->dev);
	213	#endif
	214	tmp.st_ino = stat->ino;
afefdbb2 DH	215	if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
afefdbb2 DH	216	return -EOVERFLOW;
1da177e4 LT	217	tmp.st_mode = stat->mode;
	218	tmp.st_nlink = stat->nlink;
	219	if (tmp.st_nlink != stat->nlink)
	220	return -EOVERFLOW;
	221	SET_UID(tmp.st_uid, stat->uid);
	222	SET_GID(tmp.st_gid, stat->gid);
	223	#if BITS_PER_LONG == 32
	224	tmp.st_rdev = old_encode_dev(stat->rdev);
	225	#else
	226	tmp.st_rdev = new_encode_dev(stat->rdev);
	227	#endif
	228	#if BITS_PER_LONG == 32
	229	if (stat->size > MAX_NON_LFS)
	230	return -EOVERFLOW;
	231	#endif
	232	tmp.st_size = stat->size;
	233	tmp.st_atime = stat->atime.tv_sec;
	234	tmp.st_mtime = stat->mtime.tv_sec;
	235	tmp.st_ctime = stat->ctime.tv_sec;
	236	#ifdef STAT_HAVE_NSEC
	237	tmp.st_atime_nsec = stat->atime.tv_nsec;
	238	tmp.st_mtime_nsec = stat->mtime.tv_nsec;
	239	tmp.st_ctime_nsec = stat->ctime.tv_nsec;
	240	#endif
	241	tmp.st_blocks = stat->blocks;
	242	tmp.st_blksize = stat->blksize;
	243	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
	244	}
	245
5590ff0d UD	246	asmlinkage long sys_newstat(char __user filename, struct stat __user statbuf)
	247	{
	248	struct kstat stat;
	249	int error = vfs_stat_fd(AT_FDCWD, filename, &stat);
	250
	251	if (!error)
	252	error = cp_new_stat(&stat, statbuf);
	253
	254	return error;
	255	}
	256
	257	asmlinkage long sys_newlstat(char __user filename, struct stat __user statbuf)
1da177e4 LT	258	{
1da177e4 LT	259	struct kstat stat;
5590ff0d	260	int error = vfs_lstat_fd(AT_FDCWD, filename, &stat);
1da177e4 LT	261
	262	if (!error)
	263	error = cp_new_stat(&stat, statbuf);
	264
	265	return error;
	266	}
5590ff0d	267
2833c28a	268	#if !defined(__ARCH_WANT_STAT64) \|\| defined(__ARCH_WANT_SYS_NEWFSTATAT)
5590ff0d UD	269	asmlinkage long sys_newfstatat(int dfd, char __user *filename,
5590ff0d UD	270	struct stat __user *statbuf, int flag)
1da177e4 LT	271	{
1da177e4 LT	272	struct kstat stat;
5590ff0d UD	273	int error = -EINVAL;
	274
	275	if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
	276	goto out;
	277
	278	if (flag & AT_SYMLINK_NOFOLLOW)
	279	error = vfs_lstat_fd(dfd, filename, &stat);
	280	else
	281	error = vfs_stat_fd(dfd, filename, &stat);
1da177e4 LT	282
	283	if (!error)
	284	error = cp_new_stat(&stat, statbuf);
	285
5590ff0d	286	out:
1da177e4 LT	287	return error;
1da177e4 LT	288	}
cff2b760	289	#endif
5590ff0d UD	290
5590ff0d UD	291	asmlinkage long sys_newfstat(unsigned int fd, struct stat __user *statbuf)
1da177e4 LT	292	{
	293	struct kstat stat;
	294	int error = vfs_fstat(fd, &stat);
	295
	296	if (!error)
	297	error = cp_new_stat(&stat, statbuf);
	298
	299	return error;
	300	}
	301
5590ff0d UD	302	asmlinkage long sys_readlinkat(int dfd, const char __user *path,
5590ff0d UD	303	char __user *buf, int bufsiz)
1da177e4 LT	304	{
	305	struct nameidata nd;
	306	int error;
	307
	308	if (bufsiz <= 0)
	309	return -EINVAL;
	310
5590ff0d	311	error = __user_walk_fd(dfd, path, 0, &nd);
1da177e4 LT	312	if (!error) {
	313	struct inode * inode = nd.dentry->d_inode;
	314
	315	error = -EINVAL;
	316	if (inode->i_op && inode->i_op->readlink) {
	317	error = security_inode_readlink(nd.dentry);
	318	if (!error) {
	319	touch_atime(nd.mnt, nd.dentry);
	320	error = inode->i_op->readlink(nd.dentry, buf, bufsiz);
	321	}
	322	}
	323	path_release(&nd);
	324	}
	325	return error;
	326	}
	327
5590ff0d UD	328	asmlinkage long sys_readlink(const char __user path, char __user buf,
	329	int bufsiz)
	330	{
	331	return sys_readlinkat(AT_FDCWD, path, buf, bufsiz);
	332	}
	333
1da177e4 LT	334
	335	/* ---------- LFS-64 ----------- */
	336	#ifdef __ARCH_WANT_STAT64
	337
	338	static long cp_new_stat64(struct kstat stat, struct stat64 __user statbuf)
	339	{
	340	struct stat64 tmp;
	341
	342	memset(&tmp, 0, sizeof(struct stat64));
	343	#ifdef CONFIG_MIPS
	344	/* mips has weird padding, so we don't get 64 bits there */
	345	if (!new_valid_dev(stat->dev) \|\| !new_valid_dev(stat->rdev))
	346	return -EOVERFLOW;
	347	tmp.st_dev = new_encode_dev(stat->dev);
	348	tmp.st_rdev = new_encode_dev(stat->rdev);
	349	#else
	350	tmp.st_dev = huge_encode_dev(stat->dev);
	351	tmp.st_rdev = huge_encode_dev(stat->rdev);
	352	#endif
	353	tmp.st_ino = stat->ino;
afefdbb2 DH	354	if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
afefdbb2 DH	355	return -EOVERFLOW;
1da177e4 LT	356	#ifdef STAT64_HAS_BROKEN_ST_INO
	357	tmp.__st_ino = stat->ino;
	358	#endif
	359	tmp.st_mode = stat->mode;
	360	tmp.st_nlink = stat->nlink;
	361	tmp.st_uid = stat->uid;
	362	tmp.st_gid = stat->gid;
	363	tmp.st_atime = stat->atime.tv_sec;
	364	tmp.st_atime_nsec = stat->atime.tv_nsec;
	365	tmp.st_mtime = stat->mtime.tv_sec;
	366	tmp.st_mtime_nsec = stat->mtime.tv_nsec;
	367	tmp.st_ctime = stat->ctime.tv_sec;
	368	tmp.st_ctime_nsec = stat->ctime.tv_nsec;
	369	tmp.st_size = stat->size;
	370	tmp.st_blocks = stat->blocks;
	371	tmp.st_blksize = stat->blksize;
	372	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
	373	}
	374
	375	asmlinkage long sys_stat64(char __user * filename, struct stat64 __user * statbuf)
	376	{
	377	struct kstat stat;
	378	int error = vfs_stat(filename, &stat);
	379
	380	if (!error)
	381	error = cp_new_stat64(&stat, statbuf);
	382
	383	return error;
	384	}
	385	asmlinkage long sys_lstat64(char __user * filename, struct stat64 __user * statbuf)
	386	{
	387	struct kstat stat;
	388	int error = vfs_lstat(filename, &stat);
	389
	390	if (!error)
	391	error = cp_new_stat64(&stat, statbuf);
	392
	393	return error;
	394	}
	395	asmlinkage long sys_fstat64(unsigned long fd, struct stat64 __user * statbuf)
	396	{
	397	struct kstat stat;
	398	int error = vfs_fstat(fd, &stat);
	399
	400	if (!error)
	401	error = cp_new_stat64(&stat, statbuf);
	402
	403	return error;
	404	}
	405
cff2b760 UD	406	asmlinkage long sys_fstatat64(int dfd, char __user *filename,
	407	struct stat64 __user *statbuf, int flag)
	408	{
	409	struct kstat stat;
	410	int error = -EINVAL;
	411
	412	if ((flag & ~AT_SYMLINK_NOFOLLOW) != 0)
	413	goto out;
	414
	415	if (flag & AT_SYMLINK_NOFOLLOW)
	416	error = vfs_lstat_fd(dfd, filename, &stat);
	417	else
	418	error = vfs_stat_fd(dfd, filename, &stat);
	419
	420	if (!error)
	421	error = cp_new_stat64(&stat, statbuf);
	422
	423	out:
	424	return error;
	425	}
1da177e4 LT	426	#endif /* __ARCH_WANT_STAT64 */
	427
	428	void inode_add_bytes(struct inode *inode, loff_t bytes)
	429	{
	430	spin_lock(&inode->i_lock);
	431	inode->i_blocks += bytes >> 9;
	432	bytes &= 511;
	433	inode->i_bytes += bytes;
	434	if (inode->i_bytes >= 512) {
	435	inode->i_blocks++;
	436	inode->i_bytes -= 512;
	437	}
	438	spin_unlock(&inode->i_lock);
	439	}
	440
	441	EXPORT_SYMBOL(inode_add_bytes);
	442
	443	void inode_sub_bytes(struct inode *inode, loff_t bytes)
	444	{
	445	spin_lock(&inode->i_lock);
	446	inode->i_blocks -= bytes >> 9;
	447	bytes &= 511;
	448	if (inode->i_bytes < bytes) {
	449	inode->i_blocks--;
	450	inode->i_bytes += 512;
	451	}
	452	inode->i_bytes -= bytes;
	453	spin_unlock(&inode->i_lock);
	454	}
	455
	456	EXPORT_SYMBOL(inode_sub_bytes);
	457
	458	loff_t inode_get_bytes(struct inode *inode)
	459	{
	460	loff_t ret;
	461
	462	spin_lock(&inode->i_lock);
	463	ret = (((loff_t)inode->i_blocks) << 9) + inode->i_bytes;
	464	spin_unlock(&inode->i_lock);
	465	return ret;
	466	}
	467
	468	EXPORT_SYMBOL(inode_get_bytes);
	469
	470	void inode_set_bytes(struct inode *inode, loff_t bytes)
	471	{
	472	/* Caller is here responsible for sufficient locking
	473	* (ie. inode->i_lock) */
	474	inode->i_blocks = bytes >> 9;
	475	inode->i_bytes = bytes & 511;
	476	}
	477
	478	EXPORT_SYMBOL(inode_set_bytes);