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

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

#include <linux/export.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 path *path, struct kstat *stat)
{
	struct inode *inode = path->dentry->d_inode;
	int retval;

	retval = security_inode_getattr(path->mnt, path->dentry);
	if (retval)
		return retval;

	if (inode->i_op->getattr)
		return inode->i_op->getattr(path->mnt, path->dentry, stat);

	generic_fillattr(inode, stat);
	return 0;
}

EXPORT_SYMBOL(vfs_getattr);

int vfs_fstat(unsigned int fd, struct kstat *stat)
{
	struct fd f = fdget_raw(fd);
	int error = -EBADF;

	if (f.file) {
		error = vfs_getattr(&f.file->f_path, stat);
		fdput(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;
	unsigned 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;
retry:
	error = user_path_at(dfd, filename, lookup_flags, &path);
	if (error)
		goto out;

	error = vfs_getattr(&path, stat);
	path_put(&path);
	if (retry_estale(error, lookup_flags)) {
		lookup_flags |= LOOKUP_REVAL;
		goto retry;
	}
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, from_kuid_munged(current_user_ns(), stat->uid));
	SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), 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 */

#if BITS_PER_LONG == 32
#  define choose_32_64(a,b) a
#else
#  define choose_32_64(a,b) b
#endif

#define valid_dev(x)  choose_32_64(old_valid_dev,new_valid_dev)(x)
#define encode_dev(x) choose_32_64(old_encode_dev,new_encode_dev)(x)

#ifndef INIT_STRUCT_STAT_PADDING
#  define INIT_STRUCT_STAT_PADDING(st) memset(&st, 0, sizeof(st))
#endif

static int cp_new_stat(struct kstat *stat, struct stat __user *statbuf)
{
	struct stat tmp;

	if (!valid_dev(stat->dev) || !valid_dev(stat->rdev))
		return -EOVERFLOW;
#if BITS_PER_LONG == 32
	if (stat->size > MAX_NON_LFS)
		return -EOVERFLOW;
#endif

	INIT_STRUCT_STAT_PADDING(tmp);
	tmp.st_dev = 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, from_kuid_munged(current_user_ns(), stat->uid));
	SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
	tmp.st_rdev = encode_dev(stat->rdev);
	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;
	int empty = 0;
	unsigned int lookup_flags = LOOKUP_EMPTY;

	if (bufsiz <= 0)
		return -EINVAL;

retry:
	error = user_path_at_empty(dfd, pathname, lookup_flags, &path, &empty);
	if (!error) {
		struct inode *inode = path.dentry->d_inode;

		error = empty ? -ENOENT : -EINVAL;
		if (inode->i_op->readlink) {
			error = security_inode_readlink(path.dentry);
			if (!error) {
				touch_atime(&path);
				error = inode->i_op->readlink(path.dentry,
							      buf, bufsiz);
			}
		}
		path_put(&path);
		if (retry_estale(error, lookup_flags)) {
			lookup_flags |= LOOKUP_REVAL;
			goto retry;
		}
	}
	return error;
}

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


/* ---------- LFS-64 ----------- */
#if defined(__ARCH_WANT_STAT64) || defined(__ARCH_WANT_COMPAT_STAT64)

#ifndef INIT_STRUCT_STAT64_PADDING
#  define INIT_STRUCT_STAT64_PADDING(st) memset(&st, 0, sizeof(st))
#endif

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

	INIT_STRUCT_STAT64_PADDING(tmp);
#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 = from_kuid_munged(current_user_ns(), stat->uid);
	tmp.st_gid = from_kgid_munged(current_user_ns(), 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 || __ARCH_WANT_COMPAT_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
	1	/*
	2	* linux/fs/stat.c
	3	*
	4	* Copyright (C) 1991, 1992 Linus Torvalds
	5	*/
	6
	7	#include <linux/export.h>
	8	#include <linux/mm.h>
	9	#include <linux/errno.h>
	10	#include <linux/file.h>
	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>
	16	#include <linux/pagemap.h>
	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->size = i_size_read(inode);
	31	stat->atime = inode->i_atime;
	32	stat->mtime = inode->i_mtime;
	33	stat->ctime = inode->i_ctime;
	34	stat->blksize = (1 << inode->i_blkbits);
	35	stat->blocks = inode->i_blocks;
	36	}
	37
	38	EXPORT_SYMBOL(generic_fillattr);
	39
	40	int vfs_getattr(struct path path, struct kstat stat)
	41	{
	42	struct inode *inode = path->dentry->d_inode;
	43	int retval;
	44
	45	retval = security_inode_getattr(path->mnt, path->dentry);
	46	if (retval)
	47	return retval;
	48
	49	if (inode->i_op->getattr)
	50	return inode->i_op->getattr(path->mnt, path->dentry, stat);
	51
	52	generic_fillattr(inode, stat);
	53	return 0;
	54	}
	55
	56	EXPORT_SYMBOL(vfs_getattr);
	57
	58	int vfs_fstat(unsigned int fd, struct kstat *stat)
	59	{
	60	struct fd f = fdget_raw(fd);
	61	int error = -EBADF;
	62
	63	if (f.file) {
	64	error = vfs_getattr(&f.file->f_path, stat);
	65	fdput(f);
	66	}
	67	return error;
	68	}
	69	EXPORT_SYMBOL(vfs_fstat);
	70
	71	int vfs_fstatat(int dfd, const char __user filename, struct kstat stat,
	72	int flag)
	73	{
	74	struct path path;
	75	int error = -EINVAL;
	76	unsigned int lookup_flags = 0;
	77
	78	if ((flag & ~(AT_SYMLINK_NOFOLLOW \| AT_NO_AUTOMOUNT \|
	79	AT_EMPTY_PATH)) != 0)
	80	goto out;
	81
	82	if (!(flag & AT_SYMLINK_NOFOLLOW))
	83	lookup_flags \|= LOOKUP_FOLLOW;
	84	if (flag & AT_EMPTY_PATH)
	85	lookup_flags \|= LOOKUP_EMPTY;
	86	retry:
	87	error = user_path_at(dfd, filename, lookup_flags, &path);
	88	if (error)
	89	goto out;
	90
	91	error = vfs_getattr(&path, stat);
	92	path_put(&path);
	93	if (retry_estale(error, lookup_flags)) {
	94	lookup_flags \|= LOOKUP_REVAL;
	95	goto retry;
	96	}
	97	out:
	98	return error;
	99	}
	100	EXPORT_SYMBOL(vfs_fstatat);
	101
	102	int vfs_stat(const char __user name, struct kstat stat)
	103	{
	104	return vfs_fstatat(AT_FDCWD, name, stat, 0);
	105	}
	106	EXPORT_SYMBOL(vfs_stat);
	107
	108	int vfs_lstat(const char __user name, struct kstat stat)
	109	{
	110	return vfs_fstatat(AT_FDCWD, name, stat, AT_SYMLINK_NOFOLLOW);
	111	}
	112	EXPORT_SYMBOL(vfs_lstat);
	113
	114
	115	#ifdef __ARCH_WANT_OLD_STAT
	116
	117	/*
	118	* For backward compatibility? Maybe this should be moved
	119	* into arch/i386 instead?
	120	*/
	121	static int cp_old_stat(struct kstat stat, struct __old_kernel_stat __user statbuf)
	122	{
	123	static int warncount = 5;
	124	struct __old_kernel_stat tmp;
	125
	126	if (warncount > 0) {
	127	warncount--;
	128	printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n",
	129	current->comm);
	130	} else if (warncount < 0) {
	131	/* it's laughable, but... */
	132	warncount = 0;
	133	}
	134
	135	memset(&tmp, 0, sizeof(struct __old_kernel_stat));
	136	tmp.st_dev = old_encode_dev(stat->dev);
	137	tmp.st_ino = stat->ino;
	138	if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
	139	return -EOVERFLOW;
	140	tmp.st_mode = stat->mode;
	141	tmp.st_nlink = stat->nlink;
	142	if (tmp.st_nlink != stat->nlink)
	143	return -EOVERFLOW;
	144	SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
	145	SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
	146	tmp.st_rdev = old_encode_dev(stat->rdev);
	147	#if BITS_PER_LONG == 32
	148	if (stat->size > MAX_NON_LFS)
	149	return -EOVERFLOW;
	150	#endif
	151	tmp.st_size = stat->size;
	152	tmp.st_atime = stat->atime.tv_sec;
	153	tmp.st_mtime = stat->mtime.tv_sec;
	154	tmp.st_ctime = stat->ctime.tv_sec;
	155	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
	156	}
	157
	158	SYSCALL_DEFINE2(stat, const char __user *, filename,
	159	struct __old_kernel_stat __user *, statbuf)
	160	{
	161	struct kstat stat;
	162	int error;
	163
	164	error = vfs_stat(filename, &stat);
	165	if (error)
	166	return error;
	167
	168	return cp_old_stat(&stat, statbuf);
	169	}
	170
	171	SYSCALL_DEFINE2(lstat, const char __user *, filename,
	172	struct __old_kernel_stat __user *, statbuf)
	173	{
	174	struct kstat stat;
	175	int error;
	176
	177	error = vfs_lstat(filename, &stat);
	178	if (error)
	179	return error;
	180
	181	return cp_old_stat(&stat, statbuf);
	182	}
	183
	184	SYSCALL_DEFINE2(fstat, unsigned int, fd, struct __old_kernel_stat __user *, statbuf)
	185	{
	186	struct kstat stat;
	187	int error = vfs_fstat(fd, &stat);
	188
	189	if (!error)
	190	error = cp_old_stat(&stat, statbuf);
	191
	192	return error;
	193	}
	194
	195	#endif /* __ARCH_WANT_OLD_STAT */
	196
	197	#if BITS_PER_LONG == 32
	198	# define choose_32_64(a,b) a
	199	#else
	200	# define choose_32_64(a,b) b
	201	#endif
	202
	203	#define valid_dev(x) choose_32_64(old_valid_dev,new_valid_dev)(x)
	204	#define encode_dev(x) choose_32_64(old_encode_dev,new_encode_dev)(x)
	205
	206	#ifndef INIT_STRUCT_STAT_PADDING
	207	# define INIT_STRUCT_STAT_PADDING(st) memset(&st, 0, sizeof(st))
	208	#endif
	209
	210	static int cp_new_stat(struct kstat stat, struct stat __user statbuf)
	211	{
	212	struct stat tmp;
	213
	214	if (!valid_dev(stat->dev) \|\| !valid_dev(stat->rdev))
	215	return -EOVERFLOW;
	216	#if BITS_PER_LONG == 32
	217	if (stat->size > MAX_NON_LFS)
	218	return -EOVERFLOW;
	219	#endif
	220
	221	INIT_STRUCT_STAT_PADDING(tmp);
	222	tmp.st_dev = encode_dev(stat->dev);
	223	tmp.st_ino = stat->ino;
	224	if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
	225	return -EOVERFLOW;
	226	tmp.st_mode = stat->mode;
	227	tmp.st_nlink = stat->nlink;
	228	if (tmp.st_nlink != stat->nlink)
	229	return -EOVERFLOW;
	230	SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
	231	SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
	232	tmp.st_rdev = encode_dev(stat->rdev);
	233	tmp.st_size = stat->size;
	234	tmp.st_atime = stat->atime.tv_sec;
	235	tmp.st_mtime = stat->mtime.tv_sec;
	236	tmp.st_ctime = stat->ctime.tv_sec;
	237	#ifdef STAT_HAVE_NSEC
	238	tmp.st_atime_nsec = stat->atime.tv_nsec;
	239	tmp.st_mtime_nsec = stat->mtime.tv_nsec;
	240	tmp.st_ctime_nsec = stat->ctime.tv_nsec;
	241	#endif
	242	tmp.st_blocks = stat->blocks;
	243	tmp.st_blksize = stat->blksize;
	244	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
	245	}
	246
	247	SYSCALL_DEFINE2(newstat, const char __user *, filename,
	248	struct stat __user *, statbuf)
	249	{
	250	struct kstat stat;
	251	int error = vfs_stat(filename, &stat);
	252
	253	if (error)
	254	return error;
	255	return cp_new_stat(&stat, statbuf);
	256	}
	257
	258	SYSCALL_DEFINE2(newlstat, const char __user *, filename,
	259	struct stat __user *, statbuf)
	260	{
	261	struct kstat stat;
	262	int error;
	263
	264	error = vfs_lstat(filename, &stat);
	265	if (error)
	266	return error;
	267
	268	return cp_new_stat(&stat, statbuf);
	269	}
	270
	271	#if !defined(__ARCH_WANT_STAT64) \|\| defined(__ARCH_WANT_SYS_NEWFSTATAT)
	272	SYSCALL_DEFINE4(newfstatat, int, dfd, const char __user *, filename,
	273	struct stat __user *, statbuf, int, flag)
	274	{
	275	struct kstat stat;
	276	int error;
	277
	278	error = vfs_fstatat(dfd, filename, &stat, flag);
	279	if (error)
	280	return error;
	281	return cp_new_stat(&stat, statbuf);
	282	}
	283	#endif
	284
	285	SYSCALL_DEFINE2(newfstat, unsigned int, fd, struct stat __user *, statbuf)
	286	{
	287	struct kstat stat;
	288	int error = vfs_fstat(fd, &stat);
	289
	290	if (!error)
	291	error = cp_new_stat(&stat, statbuf);
	292
	293	return error;
	294	}
	295
	296	SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname,
	297	char __user *, buf, int, bufsiz)
	298	{
	299	struct path path;
	300	int error;
	301	int empty = 0;
	302	unsigned int lookup_flags = LOOKUP_EMPTY;
	303
	304	if (bufsiz <= 0)
	305	return -EINVAL;
	306
	307	retry:
	308	error = user_path_at_empty(dfd, pathname, lookup_flags, &path, &empty);
	309	if (!error) {
	310	struct inode *inode = path.dentry->d_inode;
	311
	312	error = empty ? -ENOENT : -EINVAL;
	313	if (inode->i_op->readlink) {
	314	error = security_inode_readlink(path.dentry);
	315	if (!error) {
	316	touch_atime(&path);
	317	error = inode->i_op->readlink(path.dentry,
	318	buf, bufsiz);
	319	}
	320	}
	321	path_put(&path);
	322	if (retry_estale(error, lookup_flags)) {
	323	lookup_flags \|= LOOKUP_REVAL;
	324	goto retry;
	325	}
	326	}
	327	return error;
	328	}
	329
	330	SYSCALL_DEFINE3(readlink, const char __user , path, char __user , buf,
	331	int, bufsiz)
	332	{
	333	return sys_readlinkat(AT_FDCWD, path, buf, bufsiz);
	334	}
	335
	336
	337	/* ---------- LFS-64 ----------- */
	338	#if defined(__ARCH_WANT_STAT64) \|\| defined(__ARCH_WANT_COMPAT_STAT64)
	339
	340	#ifndef INIT_STRUCT_STAT64_PADDING
	341	# define INIT_STRUCT_STAT64_PADDING(st) memset(&st, 0, sizeof(st))
	342	#endif
	343
	344	static long cp_new_stat64(struct kstat stat, struct stat64 __user statbuf)
	345	{
	346	struct stat64 tmp;
	347
	348	INIT_STRUCT_STAT64_PADDING(tmp);
	349	#ifdef CONFIG_MIPS
	350	/* mips has weird padding, so we don't get 64 bits there */
	351	if (!new_valid_dev(stat->dev) \|\| !new_valid_dev(stat->rdev))
	352	return -EOVERFLOW;
	353	tmp.st_dev = new_encode_dev(stat->dev);
	354	tmp.st_rdev = new_encode_dev(stat->rdev);
	355	#else
	356	tmp.st_dev = huge_encode_dev(stat->dev);
	357	tmp.st_rdev = huge_encode_dev(stat->rdev);
	358	#endif
	359	tmp.st_ino = stat->ino;
	360	if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
	361	return -EOVERFLOW;
	362	#ifdef STAT64_HAS_BROKEN_ST_INO
	363	tmp.__st_ino = stat->ino;
	364	#endif
	365	tmp.st_mode = stat->mode;
	366	tmp.st_nlink = stat->nlink;
	367	tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
	368	tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
	369	tmp.st_atime = stat->atime.tv_sec;
	370	tmp.st_atime_nsec = stat->atime.tv_nsec;
	371	tmp.st_mtime = stat->mtime.tv_sec;
	372	tmp.st_mtime_nsec = stat->mtime.tv_nsec;
	373	tmp.st_ctime = stat->ctime.tv_sec;
	374	tmp.st_ctime_nsec = stat->ctime.tv_nsec;
	375	tmp.st_size = stat->size;
	376	tmp.st_blocks = stat->blocks;
	377	tmp.st_blksize = stat->blksize;
	378	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
	379	}
	380
	381	SYSCALL_DEFINE2(stat64, const char __user *, filename,
	382	struct stat64 __user *, statbuf)
	383	{
	384	struct kstat stat;
	385	int error = vfs_stat(filename, &stat);
	386
	387	if (!error)
	388	error = cp_new_stat64(&stat, statbuf);
	389
	390	return error;
	391	}
	392
	393	SYSCALL_DEFINE2(lstat64, const char __user *, filename,
	394	struct stat64 __user *, statbuf)
	395	{
	396	struct kstat stat;
	397	int error = vfs_lstat(filename, &stat);
	398
	399	if (!error)
	400	error = cp_new_stat64(&stat, statbuf);
	401
	402	return error;
	403	}
	404
	405	SYSCALL_DEFINE2(fstat64, unsigned long, fd, struct stat64 __user *, statbuf)
	406	{
	407	struct kstat stat;
	408	int error = vfs_fstat(fd, &stat);
	409
	410	if (!error)
	411	error = cp_new_stat64(&stat, statbuf);
	412
	413	return error;
	414	}
	415
	416	SYSCALL_DEFINE4(fstatat64, int, dfd, const char __user *, filename,
	417	struct stat64 __user *, statbuf, int, flag)
	418	{
	419	struct kstat stat;
	420	int error;
	421
	422	error = vfs_fstatat(dfd, filename, &stat, flag);
	423	if (error)
	424	return error;
	425	return cp_new_stat64(&stat, statbuf);
	426	}
	427	#endif /* __ARCH_WANT_STAT64 \|\| __ARCH_WANT_COMPAT_STAT64 */
	428
	429	/* Caller is here responsible for sufficient locking (ie. inode->i_lock) */
	430	void __inode_add_bytes(struct inode *inode, loff_t bytes)
	431	{
	432	inode->i_blocks += bytes >> 9;
	433	bytes &= 511;
	434	inode->i_bytes += bytes;
	435	if (inode->i_bytes >= 512) {
	436	inode->i_blocks++;
	437	inode->i_bytes -= 512;
	438	}
	439	}
	440
	441	void inode_add_bytes(struct inode *inode, loff_t bytes)
	442	{
	443	spin_lock(&inode->i_lock);
	444	__inode_add_bytes(inode, bytes);
	445	spin_unlock(&inode->i_lock);
	446	}
	447
	448	EXPORT_SYMBOL(inode_add_bytes);
	449
	450	void inode_sub_bytes(struct inode *inode, loff_t bytes)
	451	{
	452	spin_lock(&inode->i_lock);
	453	inode->i_blocks -= bytes >> 9;
	454	bytes &= 511;
	455	if (inode->i_bytes < bytes) {
	456	inode->i_blocks--;
	457	inode->i_bytes += 512;
	458	}
	459	inode->i_bytes -= bytes;
	460	spin_unlock(&inode->i_lock);
	461	}
	462
	463	EXPORT_SYMBOL(inode_sub_bytes);
	464
	465	loff_t inode_get_bytes(struct inode *inode)
	466	{
	467	loff_t ret;
	468
	469	spin_lock(&inode->i_lock);
	470	ret = (((loff_t)inode->i_blocks) << 9) + inode->i_bytes;
	471	spin_unlock(&inode->i_lock);
	472	return ret;
	473	}
	474
	475	EXPORT_SYMBOL(inode_get_bytes);
	476
	477	void inode_set_bytes(struct inode *inode, loff_t bytes)
	478	{
	479	/* Caller is here responsible for sufficient locking
	480	* (ie. inode->i_lock) */
	481	inode->i_blocks = bytes >> 9;
	482	inode->i_bytes = bytes & 511;
	483	}
	484
	485	EXPORT_SYMBOL(inode_set_bytes);