[linux-block.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 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)
{
	int fput_needed;
	struct file *f = fget_light(fd, &fput_needed);
	int error = -EBADF;

	if (f) {
		error = vfs_getattr(f->f_path.mnt, f->f_path.dentry, stat);
		fput_light(f, fput_needed);
	}
	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, 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;

	if (bufsiz <= 0)
		return -EINVAL;

	error = user_path_at_empty(dfd, pathname, LOOKUP_EMPTY, &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);
	}
	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

#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 */

/* 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
630d9c47	7	#include <linux/export.h>
1da177e4 LT	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)
1da177e4 LT	59	{
e994defb LT	60	int fput_needed;
e994defb LT	61	struct file *f = fget_light(fd, &fput_needed);
1da177e4 LT	62	int error = -EBADF;
	63
	64	if (f) {
0f7fc9e4	65	error = vfs_getattr(f->f_path.mnt, f->f_path.dentry, stat);
e994defb	66	fput_light(f, fput_needed);
1da177e4 LT	67	}
	68	return error;
	69	}
1da177e4 LT	70	EXPORT_SYMBOL(vfs_fstat);
1da177e4 LT	71
c7887325 DH	72	int vfs_fstatat(int dfd, const char __user filename, struct kstat stat,
c7887325 DH	73	int flag)
0112fc22	74	{
2eae7a18	75	struct path path;
0112fc22	76	int error = -EINVAL;
2eae7a18	77	int lookup_flags = 0;
0112fc22	78
65cfc672 AV	79	if ((flag & ~(AT_SYMLINK_NOFOLLOW \| AT_NO_AUTOMOUNT \|
65cfc672 AV	80	AT_EMPTY_PATH)) != 0)
0112fc22 OD	81	goto out;
0112fc22 OD	82
2eae7a18 CH	83	if (!(flag & AT_SYMLINK_NOFOLLOW))
2eae7a18 CH	84	lookup_flags \|= LOOKUP_FOLLOW;
65cfc672 AV	85	if (flag & AT_EMPTY_PATH)
65cfc672 AV	86	lookup_flags \|= LOOKUP_EMPTY;
2eae7a18 CH	87
	88	error = user_path_at(dfd, filename, lookup_flags, &path);
	89	if (error)
	90	goto out;
	91
	92	error = vfs_getattr(path.mnt, path.dentry, stat);
	93	path_put(&path);
0112fc22 OD	94	out:
	95	return error;
	96	}
0112fc22 OD	97	EXPORT_SYMBOL(vfs_fstatat);
0112fc22 OD	98
c7887325	99	int vfs_stat(const char __user name, struct kstat stat)
2eae7a18 CH	100	{
	101	return vfs_fstatat(AT_FDCWD, name, stat, 0);
	102	}
	103	EXPORT_SYMBOL(vfs_stat);
	104
c7887325	105	int vfs_lstat(const char __user name, struct kstat stat)
2eae7a18 CH	106	{
	107	return vfs_fstatat(AT_FDCWD, name, stat, AT_SYMLINK_NOFOLLOW);
	108	}
	109	EXPORT_SYMBOL(vfs_lstat);
	110
0112fc22	111
1da177e4 LT	112	#ifdef __ARCH_WANT_OLD_STAT
	113
	114	/*
	115	* For backward compatibility? Maybe this should be moved
	116	* into arch/i386 instead?
	117	*/
	118	static int cp_old_stat(struct kstat stat, struct __old_kernel_stat __user statbuf)
	119	{
	120	static int warncount = 5;
	121	struct __old_kernel_stat tmp;
	122
	123	if (warncount > 0) {
	124	warncount--;
	125	printk(KERN_WARNING "VFS: Warning: %s using old stat() call. Recompile your binary.\n",
	126	current->comm);
	127	} else if (warncount < 0) {
	128	/* it's laughable, but... */
	129	warncount = 0;
	130	}
	131
	132	memset(&tmp, 0, sizeof(struct __old_kernel_stat));
	133	tmp.st_dev = old_encode_dev(stat->dev);
	134	tmp.st_ino = stat->ino;
afefdbb2 DH	135	if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
afefdbb2 DH	136	return -EOVERFLOW;
1da177e4 LT	137	tmp.st_mode = stat->mode;
	138	tmp.st_nlink = stat->nlink;
	139	if (tmp.st_nlink != stat->nlink)
	140	return -EOVERFLOW;
a7c1938e EB	141	SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
a7c1938e EB	142	SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
1da177e4 LT	143	tmp.st_rdev = old_encode_dev(stat->rdev);
	144	#if BITS_PER_LONG == 32
	145	if (stat->size > MAX_NON_LFS)
	146	return -EOVERFLOW;
	147	#endif
	148	tmp.st_size = stat->size;
	149	tmp.st_atime = stat->atime.tv_sec;
	150	tmp.st_mtime = stat->mtime.tv_sec;
	151	tmp.st_ctime = stat->ctime.tv_sec;
	152	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
	153	}
	154
c7887325 DH	155	SYSCALL_DEFINE2(stat, const char __user *, filename,
c7887325 DH	156	struct __old_kernel_stat __user *, statbuf)
1da177e4 LT	157	{
1da177e4 LT	158	struct kstat stat;
2eae7a18	159	int error;
1da177e4	160
2eae7a18 CH	161	error = vfs_stat(filename, &stat);
	162	if (error)
	163	return error;
1da177e4	164
2eae7a18	165	return cp_old_stat(&stat, statbuf);
1da177e4	166	}
257ac264	167
c7887325 DH	168	SYSCALL_DEFINE2(lstat, const char __user *, filename,
c7887325 DH	169	struct __old_kernel_stat __user *, statbuf)
1da177e4 LT	170	{
1da177e4 LT	171	struct kstat stat;
2eae7a18	172	int error;
1da177e4	173
2eae7a18 CH	174	error = vfs_lstat(filename, &stat);
	175	if (error)
	176	return error;
1da177e4	177
2eae7a18	178	return cp_old_stat(&stat, statbuf);
1da177e4	179	}
257ac264 HC	180
257ac264 HC	181	SYSCALL_DEFINE2(fstat, unsigned int, fd, struct __old_kernel_stat __user *, statbuf)
1da177e4 LT	182	{
	183	struct kstat stat;
	184	int error = vfs_fstat(fd, &stat);
	185
	186	if (!error)
	187	error = cp_old_stat(&stat, statbuf);
	188
	189	return error;
	190	}
	191
	192	#endif /* __ARCH_WANT_OLD_STAT */
	193
a52dd971 LT	194	#if BITS_PER_LONG == 32
	195	# define choose_32_64(a,b) a
	196	#else
	197	# define choose_32_64(a,b) b
	198	#endif
	199
	200	#define valid_dev(x) choose_32_64(old_valid_dev,new_valid_dev)(x)
	201	#define encode_dev(x) choose_32_64(old_encode_dev,new_encode_dev)(x)
	202
8529f613 LT	203	#ifndef INIT_STRUCT_STAT_PADDING
	204	# define INIT_STRUCT_STAT_PADDING(st) memset(&st, 0, sizeof(st))
	205	#endif
	206
1da177e4 LT	207	static int cp_new_stat(struct kstat stat, struct stat __user statbuf)
	208	{
	209	struct stat tmp;
	210
a52dd971	211	if (!valid_dev(stat->dev) \|\| !valid_dev(stat->rdev))
1da177e4	212	return -EOVERFLOW;
a52dd971 LT	213	#if BITS_PER_LONG == 32
a52dd971 LT	214	if (stat->size > MAX_NON_LFS)
1da177e4 LT	215	return -EOVERFLOW;
	216	#endif
	217
8529f613	218	INIT_STRUCT_STAT_PADDING(tmp);
a52dd971	219	tmp.st_dev = encode_dev(stat->dev);
1da177e4	220	tmp.st_ino = stat->ino;
afefdbb2 DH	221	if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
afefdbb2 DH	222	return -EOVERFLOW;
1da177e4 LT	223	tmp.st_mode = stat->mode;
	224	tmp.st_nlink = stat->nlink;
	225	if (tmp.st_nlink != stat->nlink)
	226	return -EOVERFLOW;
a7c1938e EB	227	SET_UID(tmp.st_uid, from_kuid_munged(current_user_ns(), stat->uid));
a7c1938e EB	228	SET_GID(tmp.st_gid, from_kgid_munged(current_user_ns(), stat->gid));
a52dd971	229	tmp.st_rdev = encode_dev(stat->rdev);
1da177e4 LT	230	tmp.st_size = stat->size;
	231	tmp.st_atime = stat->atime.tv_sec;
	232	tmp.st_mtime = stat->mtime.tv_sec;
	233	tmp.st_ctime = stat->ctime.tv_sec;
	234	#ifdef STAT_HAVE_NSEC
	235	tmp.st_atime_nsec = stat->atime.tv_nsec;
	236	tmp.st_mtime_nsec = stat->mtime.tv_nsec;
	237	tmp.st_ctime_nsec = stat->ctime.tv_nsec;
	238	#endif
	239	tmp.st_blocks = stat->blocks;
	240	tmp.st_blksize = stat->blksize;
	241	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
	242	}
	243
c7887325 DH	244	SYSCALL_DEFINE2(newstat, const char __user *, filename,
c7887325 DH	245	struct stat __user *, statbuf)
5590ff0d UD	246	{
5590ff0d UD	247	struct kstat stat;
2eae7a18	248	int error = vfs_stat(filename, &stat);
5590ff0d	249
2eae7a18 CH	250	if (error)
	251	return error;
	252	return cp_new_stat(&stat, statbuf);
5590ff0d UD	253	}
5590ff0d UD	254
c7887325 DH	255	SYSCALL_DEFINE2(newlstat, const char __user *, filename,
c7887325 DH	256	struct stat __user *, statbuf)
1da177e4 LT	257	{
1da177e4 LT	258	struct kstat stat;
2eae7a18	259	int error;
1da177e4	260
2eae7a18 CH	261	error = vfs_lstat(filename, &stat);
	262	if (error)
	263	return error;
1da177e4	264
2eae7a18	265	return cp_new_stat(&stat, statbuf);
1da177e4	266	}
5590ff0d	267
2833c28a	268	#if !defined(__ARCH_WANT_STAT64) \|\| defined(__ARCH_WANT_SYS_NEWFSTATAT)
c7887325	269	SYSCALL_DEFINE4(newfstatat, int, dfd, const char __user *, filename,
6559eed8	270	struct stat __user *, statbuf, int, flag)
1da177e4 LT	271	{
1da177e4 LT	272	struct kstat stat;
0112fc22	273	int error;
1da177e4	274
0112fc22 OD	275	error = vfs_fstatat(dfd, filename, &stat, flag);
	276	if (error)
	277	return error;
	278	return cp_new_stat(&stat, statbuf);
1da177e4	279	}
cff2b760	280	#endif
5590ff0d	281
257ac264	282	SYSCALL_DEFINE2(newfstat, unsigned int, fd, struct stat __user *, statbuf)
1da177e4 LT	283	{
	284	struct kstat stat;
	285	int error = vfs_fstat(fd, &stat);
	286
	287	if (!error)
	288	error = cp_new_stat(&stat, statbuf);
	289
	290	return error;
	291	}
	292
6559eed8 HC	293	SYSCALL_DEFINE4(readlinkat, int, dfd, const char __user *, pathname,
6559eed8 HC	294	char __user *, buf, int, bufsiz)
1da177e4	295	{
2d8f3038	296	struct path path;
1da177e4	297	int error;
1fa1e7f6	298	int empty = 0;
1da177e4 LT	299
	300	if (bufsiz <= 0)
	301	return -EINVAL;
	302
1fa1e7f6	303	error = user_path_at_empty(dfd, pathname, LOOKUP_EMPTY, &path, &empty);
1da177e4	304	if (!error) {
2d8f3038	305	struct inode *inode = path.dentry->d_inode;
1da177e4	306
1fa1e7f6	307	error = empty ? -ENOENT : -EINVAL;
acfa4380	308	if (inode->i_op->readlink) {
2d8f3038	309	error = security_inode_readlink(path.dentry);
1da177e4	310	if (!error) {
68ac1234	311	touch_atime(&path);
2d8f3038	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
8529f613 LT	331	#ifndef INIT_STRUCT_STAT64_PADDING
	332	# define INIT_STRUCT_STAT64_PADDING(st) memset(&st, 0, sizeof(st))
	333	#endif
	334
1da177e4 LT	335	static long cp_new_stat64(struct kstat stat, struct stat64 __user statbuf)
	336	{
	337	struct stat64 tmp;
	338
8529f613	339	INIT_STRUCT_STAT64_PADDING(tmp);
1da177e4 LT	340	#ifdef CONFIG_MIPS
	341	/* mips has weird padding, so we don't get 64 bits there */
	342	if (!new_valid_dev(stat->dev) \|\| !new_valid_dev(stat->rdev))
	343	return -EOVERFLOW;
	344	tmp.st_dev = new_encode_dev(stat->dev);
	345	tmp.st_rdev = new_encode_dev(stat->rdev);
	346	#else
	347	tmp.st_dev = huge_encode_dev(stat->dev);
	348	tmp.st_rdev = huge_encode_dev(stat->rdev);
	349	#endif
	350	tmp.st_ino = stat->ino;
afefdbb2 DH	351	if (sizeof(tmp.st_ino) < sizeof(stat->ino) && tmp.st_ino != stat->ino)
afefdbb2 DH	352	return -EOVERFLOW;
1da177e4 LT	353	#ifdef STAT64_HAS_BROKEN_ST_INO
	354	tmp.__st_ino = stat->ino;
	355	#endif
	356	tmp.st_mode = stat->mode;
	357	tmp.st_nlink = stat->nlink;
a7c1938e EB	358	tmp.st_uid = from_kuid_munged(current_user_ns(), stat->uid);
a7c1938e EB	359	tmp.st_gid = from_kgid_munged(current_user_ns(), stat->gid);
1da177e4 LT	360	tmp.st_atime = stat->atime.tv_sec;
	361	tmp.st_atime_nsec = stat->atime.tv_nsec;
	362	tmp.st_mtime = stat->mtime.tv_sec;
	363	tmp.st_mtime_nsec = stat->mtime.tv_nsec;
	364	tmp.st_ctime = stat->ctime.tv_sec;
	365	tmp.st_ctime_nsec = stat->ctime.tv_nsec;
	366	tmp.st_size = stat->size;
	367	tmp.st_blocks = stat->blocks;
	368	tmp.st_blksize = stat->blksize;
	369	return copy_to_user(statbuf,&tmp,sizeof(tmp)) ? -EFAULT : 0;
	370	}
	371
c7887325 DH	372	SYSCALL_DEFINE2(stat64, const char __user *, filename,
c7887325 DH	373	struct stat64 __user *, statbuf)
1da177e4 LT	374	{
	375	struct kstat stat;
	376	int error = vfs_stat(filename, &stat);
	377
	378	if (!error)
	379	error = cp_new_stat64(&stat, statbuf);
	380
	381	return error;
	382	}
257ac264	383
c7887325 DH	384	SYSCALL_DEFINE2(lstat64, const char __user *, filename,
c7887325 DH	385	struct stat64 __user *, statbuf)
1da177e4 LT	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	}
257ac264 HC	395
257ac264 HC	396	SYSCALL_DEFINE2(fstat64, unsigned long, fd, struct stat64 __user *, statbuf)
1da177e4 LT	397	{
	398	struct kstat stat;
	399	int error = vfs_fstat(fd, &stat);
	400
	401	if (!error)
	402	error = cp_new_stat64(&stat, statbuf);
	403
	404	return error;
	405	}
	406
c7887325	407	SYSCALL_DEFINE4(fstatat64, int, dfd, const char __user *, filename,
6559eed8	408	struct stat64 __user *, statbuf, int, flag)
cff2b760 UD	409	{
cff2b760 UD	410	struct kstat stat;
0112fc22	411	int error;
cff2b760	412
0112fc22 OD	413	error = vfs_fstatat(dfd, filename, &stat, flag);
	414	if (error)
	415	return error;
	416	return cp_new_stat64(&stat, statbuf);
cff2b760	417	}
1da177e4 LT	418	#endif /* __ARCH_WANT_STAT64 */
1da177e4 LT	419
b462707e DM	420	/* Caller is here responsible for sufficient locking (ie. inode->i_lock) */
b462707e DM	421	void __inode_add_bytes(struct inode *inode, loff_t bytes)
1da177e4	422	{
1da177e4 LT	423	inode->i_blocks += bytes >> 9;
	424	bytes &= 511;
	425	inode->i_bytes += bytes;
	426	if (inode->i_bytes >= 512) {
	427	inode->i_blocks++;
	428	inode->i_bytes -= 512;
	429	}
b462707e DM	430	}
	431
	432	void inode_add_bytes(struct inode *inode, loff_t bytes)
	433	{
	434	spin_lock(&inode->i_lock);
	435	__inode_add_bytes(inode, bytes);
1da177e4 LT	436	spin_unlock(&inode->i_lock);
	437	}
	438
	439	EXPORT_SYMBOL(inode_add_bytes);
	440
	441	void inode_sub_bytes(struct inode *inode, loff_t bytes)
	442	{
	443	spin_lock(&inode->i_lock);
	444	inode->i_blocks -= bytes >> 9;
	445	bytes &= 511;
	446	if (inode->i_bytes < bytes) {
	447	inode->i_blocks--;
	448	inode->i_bytes += 512;
	449	}
	450	inode->i_bytes -= bytes;
	451	spin_unlock(&inode->i_lock);
	452	}
	453
	454	EXPORT_SYMBOL(inode_sub_bytes);
	455
	456	loff_t inode_get_bytes(struct inode *inode)
	457	{
	458	loff_t ret;
	459
	460	spin_lock(&inode->i_lock);
	461	ret = (((loff_t)inode->i_blocks) << 9) + inode->i_bytes;
	462	spin_unlock(&inode->i_lock);
	463	return ret;
	464	}
	465
	466	EXPORT_SYMBOL(inode_get_bytes);
	467
	468	void inode_set_bytes(struct inode *inode, loff_t bytes)
	469	{
	470	/* Caller is here responsible for sufficient locking
	471	* (ie. inode->i_lock) */
	472	inode->i_blocks = bytes >> 9;
	473	inode->i_bytes = bytes & 511;
	474	}
	475
	476	EXPORT_SYMBOL(inode_set_bytes);