/* $Id: fs.c,v 1.12.2.1 1999/05/29 04:03:23 davem Exp $
 * fs.c: fs related syscall emulation for Solaris
 *
 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
 */

#include <linux/types.h>
#include <linux/sched.h>
#include <linux/fs.h>
#include <linux/mm.h>
#include <linux/file.h>
#include <linux/stat.h>
#include <linux/smp_lock.h>
#include <linux/limits.h>
#include <linux/resource.h>
#include <linux/quotaops.h>

#include <asm/uaccess.h>
#include <asm/string.h>
#include <asm/ptrace.h>

#include "conv.h"

extern char * getname32(u32 filename);
 
#define R4_DEV(DEV) ((DEV & 0xff) | ((DEV & 0xff00) << 10))
#define R4_MAJOR(DEV) (((DEV) >> 18) & 0x3fff)
#define R4_MINOR(DEV) ((DEV) & 0x3ffff)
#define R3_VERSION	1
#define R4_VERSION	2

typedef struct {
	s32	tv_sec;
	s32	tv_nsec;
} timestruct_t;

struct sol_stat {
	u32		st_dev;
	s32		st_pad1[3];     /* network id */
	u32		st_ino;
	u32		st_mode;
	u32		st_nlink;
	u32		st_uid;
	u32		st_gid;
	u32		st_rdev;
	s32		st_pad2[2];
	s32		st_size;
	s32		st_pad3;	/* st_size, off_t expansion */
	timestruct_t	st_atime;
	timestruct_t	st_mtime;
	timestruct_t	st_ctime;
	s32		st_blksize;
	s32		st_blocks;
	char		st_fstype[16];
	s32		st_pad4[8];     /* expansion area */
};

struct sol_stat64 {
	u32		st_dev;
	s32		st_pad1[3];     /* network id */
	u64		st_ino;
	u32		st_mode;
	u32		st_nlink;
	u32		st_uid;
	u32		st_gid;
	u32		st_rdev;
	s32		st_pad2[2];
	s64		st_size;
	timestruct_t	st_atime;
	timestruct_t	st_mtime;
	timestruct_t	st_ctime;
	s64		st_blksize;
	s32		st_blocks;
	char		st_fstype[16];
	s32		st_pad4[4];     /* expansion area */
};

#define UFSMAGIC (((unsigned)'u'<<24)||((unsigned)'f'<<16)||((unsigned)'s'<<8))

static inline int putstat(struct sol_stat *ubuf, struct stat *kbuf)
{
	if (put_user (R4_DEV(kbuf->st_dev), &ubuf->st_dev)	||
	    __put_user (kbuf->st_ino, &ubuf->st_ino)		||
	    __put_user (kbuf->st_mode, &ubuf->st_mode)		||
	    __put_user (kbuf->st_nlink, &ubuf->st_nlink)	||
	    __put_user (kbuf->st_uid, &ubuf->st_uid)		||
	    __put_user (kbuf->st_gid, &ubuf->st_gid)		||
	    __put_user (R4_DEV(kbuf->st_rdev), &ubuf->st_rdev)	||
	    __put_user (kbuf->st_size, &ubuf->st_size)		||
	    __put_user (kbuf->st_atime, &ubuf->st_atime.tv_sec)	||
	    __put_user (0, &ubuf->st_atime.tv_nsec)		||
	    __put_user (kbuf->st_mtime, &ubuf->st_mtime.tv_sec)	||
	    __put_user (0, &ubuf->st_mtime.tv_nsec)		||
	    __put_user (kbuf->st_ctime, &ubuf->st_ctime.tv_sec)	||
	    __put_user (0, &ubuf->st_ctime.tv_nsec)		||
	    __put_user (kbuf->st_blksize, &ubuf->st_blksize)	||
	    __put_user (kbuf->st_blocks, &ubuf->st_blocks)	||
	    __put_user (UFSMAGIC, (unsigned *)ubuf->st_fstype))
		return -EFAULT;
	return 0;
}

static inline int putstat64(struct sol_stat64 *ubuf, struct stat *kbuf)
{
	if (put_user (R4_DEV(kbuf->st_dev), &ubuf->st_dev)	||
	    __put_user (kbuf->st_ino, &ubuf->st_ino)		||
	    __put_user (kbuf->st_mode, &ubuf->st_mode)		||
	    __put_user (kbuf->st_nlink, &ubuf->st_nlink)	||
	    __put_user (kbuf->st_uid, &ubuf->st_uid)		||
	    __put_user (kbuf->st_gid, &ubuf->st_gid)		||
	    __put_user (R4_DEV(kbuf->st_rdev), &ubuf->st_rdev)	||
	    __put_user (kbuf->st_size, &ubuf->st_size)		||
	    __put_user (kbuf->st_atime, &ubuf->st_atime.tv_sec)	||
	    __put_user (0, &ubuf->st_atime.tv_nsec)		||
	    __put_user (kbuf->st_mtime, &ubuf->st_mtime.tv_sec)	||
	    __put_user (0, &ubuf->st_mtime.tv_nsec)		||
	    __put_user (kbuf->st_ctime, &ubuf->st_ctime.tv_sec)	||
	    __put_user (0, &ubuf->st_ctime.tv_nsec)		||
	    __put_user (kbuf->st_blksize, &ubuf->st_blksize)	||
	    __put_user (kbuf->st_blocks, &ubuf->st_blocks)	||
	    __put_user (UFSMAGIC, (unsigned *)ubuf->st_fstype))
		return -EFAULT;
	return 0;
}

asmlinkage int solaris_stat(u32 filename, u32 statbuf)
{
	int ret;
	struct stat s;
	char *filenam;
	mm_segment_t old_fs = get_fs();
	int (*sys_newstat)(char *,struct stat *) = 
		(int (*)(char *,struct stat *))SYS(stat);
	
	filenam = getname32 (filename);
	ret = PTR_ERR(filenam);
	if (!IS_ERR(filenam)) {
		set_fs (KERNEL_DS);
		ret = sys_newstat(filenam, &s);
		set_fs (old_fs);
		putname (filenam);
		if (putstat ((struct sol_stat *)A(statbuf), &s))
			return -EFAULT;
	}
	return ret;
}

asmlinkage int solaris_xstat(int vers, u32 filename, u32 statbuf)
{
	/* Solaris doesn't bother with looking at vers, so we do neither */
	return solaris_stat(filename, statbuf);
}

asmlinkage int solaris_stat64(u32 filename, u32 statbuf)
{
	int ret;
	struct stat s;
	char *filenam;
	mm_segment_t old_fs = get_fs();
	int (*sys_newstat)(char *,struct stat *) = 
		(int (*)(char *,struct stat *))SYS(stat);
	
	filenam = getname32 (filename);
	ret = PTR_ERR(filenam);
	if (!IS_ERR(filenam)) {
		set_fs (KERNEL_DS);
		ret = sys_newstat(filenam, &s);
		set_fs (old_fs);
		putname (filenam);
		if (putstat64 ((struct sol_stat64 *)A(statbuf), &s))
			return -EFAULT;
	}
	return ret;
}

asmlinkage int solaris_lstat(u32 filename, u32 statbuf)
{
	int ret;
	struct stat s;
	char *filenam;
	mm_segment_t old_fs = get_fs();
	int (*sys_newlstat)(char *,struct stat *) = 
		(int (*)(char *,struct stat *))SYS(lstat);
	
	filenam = getname32 (filename);
	ret = PTR_ERR(filenam);
	if (!IS_ERR(filenam)) {
		set_fs (KERNEL_DS);
		ret = sys_newlstat(filenam, &s);
		set_fs (old_fs);
		putname (filenam);
		if (putstat ((struct sol_stat *)A(statbuf), &s))
			return -EFAULT;
	}
	return ret;
}

asmlinkage int solaris_lxstat(int vers, u32 filename, u32 statbuf)
{
	return solaris_lstat(filename, statbuf);
}

asmlinkage int solaris_lstat64(u32 filename, u32 statbuf)
{
	int ret;
	struct stat s;
	char *filenam;
	mm_segment_t old_fs = get_fs();
	int (*sys_newlstat)(char *,struct stat *) = 
		(int (*)(char *,struct stat *))SYS(lstat);
	
	filenam = getname32 (filename);
	ret = PTR_ERR(filenam);
	if (!IS_ERR(filenam)) {
		set_fs (KERNEL_DS);
		ret = sys_newlstat(filenam, &s);
		set_fs (old_fs);
		putname (filenam);
		if (putstat64 ((struct sol_stat64 *)A(statbuf), &s))
			return -EFAULT;
	}
	return ret;
}

asmlinkage int solaris_fstat(unsigned int fd, u32 statbuf)
{
	int ret;
	struct stat s;
	mm_segment_t old_fs = get_fs();
	int (*sys_newfstat)(unsigned,struct stat *) = 
		(int (*)(unsigned,struct stat *))SYS(fstat);
	
	set_fs (KERNEL_DS);
	ret = sys_newfstat(fd, &s);
	set_fs (old_fs);
	if (putstat ((struct sol_stat *)A(statbuf), &s))
		return -EFAULT;
	return ret;
}

asmlinkage int solaris_fxstat(int vers, u32 fd, u32 statbuf)
{
	return solaris_fstat(fd, statbuf);
}

asmlinkage int solaris_fstat64(unsigned int fd, u32 statbuf)
{
	int ret;
	struct stat s;
	mm_segment_t old_fs = get_fs();
	int (*sys_newfstat)(unsigned,struct stat *) = 
		(int (*)(unsigned,struct stat *))SYS(fstat);
	
	set_fs (KERNEL_DS);
	ret = sys_newfstat(fd, &s);
	set_fs (old_fs);
	if (putstat64 ((struct sol_stat64 *)A(statbuf), &s))
		return -EFAULT;
	return ret;
}

asmlinkage int solaris_mknod(u32 path, u32 mode, s32 dev)
{
	int (*sys_mknod)(const char *,int,dev_t) = 
		(int (*)(const char *,int,dev_t))SYS(mknod);
	int major, minor;

	if ((major = R4_MAJOR(dev)) > 255 || 
	    (minor = R4_MINOR(dev)) > 255) return -EINVAL;
	return sys_mknod((const char *)A(path), mode, MKDEV(major,minor));
}

asmlinkage int solaris_xmknod(int vers, u32 path, u32 mode, s32 dev)
{
	return solaris_mknod(path, mode, dev);
}

asmlinkage int solaris_getdents64(unsigned int fd, void *dirent, unsigned int count)
{
	int (*sys_getdents)(unsigned int, void *, unsigned int) =
		(int (*)(unsigned int, void *, unsigned int))SYS(getdents);
		
	return sys_getdents(fd, dirent, count);
}

/* This statfs thingie probably will go in the near future, but... */

struct sol_statfs {
	short	f_type;
	s32	f_bsize;
	s32	f_frsize;
	s32	f_blocks;
	s32	f_bfree;
	u32	f_files;
	u32	f_ffree;
	char	f_fname[6];
	char	f_fpack[6];
};

asmlinkage int solaris_statfs(u32 path, u32 buf, int len, int fstype)
{
	int ret;
	struct statfs s;
	mm_segment_t old_fs = get_fs();
	int (*sys_statfs)(const char *,struct statfs *) = 
		(int (*)(const char *,struct statfs *))SYS(statfs);
	struct sol_statfs *ss = (struct sol_statfs *)A(buf);
	
	if (len != sizeof(struct sol_statfs)) return -EINVAL;
	if (!fstype) {
		set_fs (KERNEL_DS);
		ret = sys_statfs((const char *)A(path), &s);
		set_fs (old_fs);
		if (!ret) {
			if (put_user (s.f_type, &ss->f_type)		||
			    __put_user (s.f_bsize, &ss->f_bsize)	||
			    __put_user (0, &ss->f_frsize)		||
			    __put_user (s.f_blocks, &ss->f_blocks)	||
			    __put_user (s.f_bfree, &ss->f_bfree)	||
			    __put_user (s.f_files, &ss->f_files)	||
			    __put_user (s.f_ffree, &ss->f_ffree)	||
			    __clear_user (&ss->f_fname, 12))
				return -EFAULT;
		}
		return ret;
	}
/* Linux can't stat unmounted filesystems so we
 * simply lie and claim 100MB of 1GB is free. Sorry.
 */
	if (put_user (fstype, &ss->f_type)		||
	    __put_user (1024, &ss->f_bsize)		||
	    __put_user (0, &ss->f_frsize)		||
	    __put_user (1024*1024, &ss->f_blocks)	||
	    __put_user (100*1024, &ss->f_bfree)		||
	    __put_user (60000, &ss->f_files)		||
	    __put_user (50000, &ss->f_ffree)		||
	    __clear_user (&ss->f_fname, 12))
		return -EFAULT;
	return 0;
}

asmlinkage int solaris_fstatfs(u32 fd, u32 buf, int len, int fstype)
{
	int ret;
	struct statfs s;
	mm_segment_t old_fs = get_fs();
	int (*sys_fstatfs)(unsigned,struct statfs *) = 
		(int (*)(unsigned,struct statfs *))SYS(fstatfs);
	struct sol_statfs *ss = (struct sol_statfs *)A(buf);
	
	if (len != sizeof(struct sol_statfs)) return -EINVAL;
	if (!fstype) {
		set_fs (KERNEL_DS);
		ret = sys_fstatfs(fd, &s);
		set_fs (old_fs);
		if (!ret) {
			if (put_user (s.f_type, &ss->f_type)		||
			    __put_user (s.f_bsize, &ss->f_bsize)	||
			    __put_user (0, &ss->f_frsize)		||
			    __put_user (s.f_blocks, &ss->f_blocks)	||
			    __put_user (s.f_bfree, &ss->f_bfree)	||
			    __put_user (s.f_files, &ss->f_files)	||
			    __put_user (s.f_ffree, &ss->f_ffree)	||
			    __clear_user (&ss->f_fname, 12))
				return -EFAULT;
		}
		return ret;
	}
	/* Otherwise fstatfs is the same as statfs */
	return solaris_statfs(0, buf, len, fstype);
}

struct sol_statvfs {
	u32	f_bsize;
	u32	f_frsize;
	u32	f_blocks;
	u32	f_bfree;
	u32	f_bavail;
	u32	f_files;
	u32	f_ffree;
	u32	f_favail;
	u32	f_fsid;
	char	f_basetype[16];
	u32	f_flag;
	u32	f_namemax;
	char	f_fstr[32];
	u32	f_filler[16];
};

struct sol_statvfs64 {
	u32	f_bsize;
	u32	f_frsize;
	u64	f_blocks;
	u64	f_bfree;
	u64	f_bavail;
	u64	f_files;
	u64	f_ffree;
	u64	f_favail;
	u32	f_fsid;
	char	f_basetype[16];
	u32	f_flag;
	u32	f_namemax;
	char	f_fstr[32];
	u32	f_filler[16];
};

static int report_statvfs(struct inode *inode, u32 buf)
{
	struct statfs s;
	mm_segment_t old_fs = get_fs();
	int error;
	struct sol_statvfs *ss = (struct sol_statvfs *)A(buf);

	if (!inode->i_sb)
		return -ENODEV;
	if (!inode->i_sb->s_op->statfs)
		return -ENOSYS;
	set_fs (KERNEL_DS);
	error = inode->i_sb->s_op->statfs(inode->i_sb, &s, sizeof(struct statfs));
	set_fs (old_fs);
	if (!error) {
		const char *p = inode->i_sb->s_type->name;
		int i = 0;
		int j = strlen (p);
		
		if (j > 15) j = 15;
		if (IS_RDONLY(inode)) i = 1;
		if (IS_NOSUID(inode)) i |= 2;
		if (put_user (s.f_bsize, &ss->f_bsize)		||
		    __put_user (0, &ss->f_frsize)		||
		    __put_user (s.f_blocks, &ss->f_blocks)	||
		    __put_user (s.f_bfree, &ss->f_bfree)	||
		    __put_user (s.f_bavail, &ss->f_bavail)	||
		    __put_user (s.f_files, &ss->f_files)	||
		    __put_user (s.f_ffree, &ss->f_ffree)	||
		    __put_user (s.f_ffree, &ss->f_favail)	||
		    __put_user (R4_DEV(inode->i_sb->s_dev), &ss->f_fsid) ||
		    __copy_to_user (ss->f_basetype,p,j)		||
		    __put_user (0, (char *)&ss->f_basetype[j])	||
		    __put_user (s.f_namelen, &ss->f_namemax)	||
		    __put_user (i, &ss->f_flag)			||		    
		    __clear_user (&ss->f_fstr, 32))
			return -EFAULT;
	}
	return error;
}

static int report_statvfs64(struct inode *inode, u32 buf)
{
	struct statfs s;
	mm_segment_t old_fs = get_fs();
	int error;
	struct sol_statvfs64 *ss = (struct sol_statvfs64 *)A(buf);
			
	if (!inode->i_sb)
		return -ENODEV;
	if (!inode->i_sb->s_op->statfs)
		return -ENOSYS;
	set_fs (KERNEL_DS);
	error = inode->i_sb->s_op->statfs(inode->i_sb, &s, sizeof(struct statfs));
	set_fs (old_fs);
	if (!error) {
		const char *p = inode->i_sb->s_type->name;
		int i = 0;
		int j = strlen (p);
		
		if (j > 15) j = 15;
		if (IS_RDONLY(inode)) i = 1;
		if (IS_NOSUID(inode)) i |= 2;
		if (put_user (s.f_bsize, &ss->f_bsize)		||
		    __put_user (0, &ss->f_frsize)		||
		    __put_user (s.f_blocks, &ss->f_blocks)	||
		    __put_user (s.f_bfree, &ss->f_bfree)	||
		    __put_user (s.f_bavail, &ss->f_bavail)	||
		    __put_user (s.f_files, &ss->f_files)	||
		    __put_user (s.f_ffree, &ss->f_ffree)	||
		    __put_user (s.f_ffree, &ss->f_favail)	||
		    __put_user (R4_DEV(inode->i_sb->s_dev), &ss->f_fsid) ||
		    __copy_to_user (ss->f_basetype,p,j)		||
		    __put_user (0, (char *)&ss->f_basetype[j])	||
		    __put_user (s.f_namelen, &ss->f_namemax)	||
		    __put_user (i, &ss->f_flag)			||		    
		    __clear_user (&ss->f_fstr, 32))
			return -EFAULT;
	}
	return error;
}

asmlinkage int solaris_statvfs(u32 path, u32 buf)
{
	struct dentry * dentry;
	int error;

	lock_kernel();
	dentry = namei((const char *)A(path));
	error = PTR_ERR(dentry);
	if (!IS_ERR(dentry)) {
		struct inode * inode = dentry->d_inode;

		error = report_statvfs(inode, buf);
		dput(dentry);
	}
	unlock_kernel();
	return error;
}

asmlinkage int solaris_fstatvfs(unsigned int fd, u32 buf)
{
	struct inode * inode;
	struct dentry * dentry;
	struct file * file;
	int error;

	lock_kernel();
	error = -EBADF;
	file = fget(fd);
	if (!file)
		goto out;

	if (!(dentry = file->f_dentry))
		error = -ENOENT;
	else if (!(inode = dentry->d_inode))
		error = -ENOENT;
	else
		error = report_statvfs(inode, buf);
	fput(file);
out:
	unlock_kernel();
	return error;
}

asmlinkage int solaris_statvfs64(u32 path, u32 buf)
{
	struct dentry * dentry;
	int error;

	lock_kernel();
	dentry = namei((const char *)A(path));
	error = PTR_ERR(dentry);
	if (!IS_ERR(dentry)) {
		struct inode * inode = dentry->d_inode;

		error = report_statvfs64(inode, buf);
		dput(dentry);
	}
	unlock_kernel();
	return error;
}

asmlinkage int solaris_fstatvfs64(unsigned int fd, u32 buf)
{
	struct inode * inode;
	struct dentry * dentry;
	struct file * file;
	int error;

	lock_kernel();
	error = -EBADF;
	file = fget(fd);
	if (!file)
		goto out;

	if (!(dentry = file->f_dentry))
		error = -ENOENT;
	else if (!(inode = dentry->d_inode))
		error = -ENOENT;
	else
		error = report_statvfs64(inode, buf);
	fput(file);
out:
	unlock_kernel();
	return error;
}

asmlinkage int solaris_open(u32 filename, int flags, u32 mode)
{
	int (*sys_open)(const char *,int,int) = 
		(int (*)(const char *,int,int))SYS(open);
	int fl = flags & 0xf;

/*	if (flags & 0x2000) - allow LFS			*/
	if (flags & 0x8050) fl |= O_SYNC;
	if (flags & 0x80) fl |= O_NONBLOCK;
	if (flags & 0x100) fl |= O_CREAT;
	if (flags & 0x200) fl |= O_TRUNC;
	if (flags & 0x400) fl |= O_EXCL;
	if (flags & 0x800) fl |= O_NOCTTY;
	return sys_open((const char *)A(filename), fl, mode);
}

#define SOL_F_SETLK	6
#define SOL_F_SETLKW	7
#define SOL_F_FREESP    11
#define SOL_F_ISSTREAM  13
#define SOL_F_GETLK     14
#define SOL_F_PRIV      15
#define SOL_F_NPRIV     16
#define SOL_F_QUOTACTL  17
#define SOL_F_BLOCKS    18
#define SOL_F_BLKSIZE   19
#define SOL_F_GETOWN    23
#define SOL_F_SETOWN    24

struct sol_flock {
	short	l_type;
	short	l_whence;
	u32	l_start;
	u32	l_len;
	s32	l_sysid;
	s32	l_pid;
	s32	l_pad[4];
};

asmlinkage int solaris_fcntl(unsigned fd, unsigned cmd, u32 arg)
{
	int (*sys_fcntl)(unsigned,unsigned,unsigned long) = 
		(int (*)(unsigned,unsigned,unsigned long))SYS(fcntl);
	int ret, flags;

	switch (cmd) {
	case F_DUPFD:
	case F_GETFD:
	case F_SETFD: return sys_fcntl(fd, cmd, (unsigned long)arg);
	case F_GETFL:
		flags = sys_fcntl(fd, cmd, 0);
		ret = flags & 0xf;
		if (flags & O_SYNC) ret |= 0x8050;
		if (flags & O_NONBLOCK) ret |= 0x80;
		return ret;
	case F_SETFL:
		flags = arg & 0xf;
		if (arg & 0x8050) flags |= O_SYNC;
		if (arg & 0x80) flags |= O_NONBLOCK;
		return sys_fcntl(fd, cmd, (long)flags);
	case SOL_F_GETLK:
	case SOL_F_SETLK:
	case SOL_F_SETLKW:
		{
			struct flock f;
			mm_segment_t old_fs = get_fs();

			switch (cmd) {
			case SOL_F_GETLK: cmd = F_GETLK; break;
			case SOL_F_SETLK: cmd = F_SETLK; break;
			case SOL_F_SETLKW: cmd = F_SETLKW; break;
			}

			get_user_ret (f.l_type, &((struct sol_flock *)A(arg))->l_type, -EFAULT);
			__get_user_ret (f.l_whence, &((struct sol_flock *)A(arg))->l_whence, -EFAULT);
			__get_user_ret (f.l_start, &((struct sol_flock *)A(arg))->l_start, -EFAULT);
			__get_user_ret (f.l_len, &((struct sol_flock *)A(arg))->l_len, -EFAULT);
			__get_user_ret (f.l_pid, &((struct sol_flock *)A(arg))->l_sysid, -EFAULT);
			set_fs(KERNEL_DS);
			ret = sys_fcntl(fd, cmd, (unsigned long)&f);
			set_fs(old_fs);
			__put_user_ret (f.l_type, &((struct sol_flock *)A(arg))->l_type, -EFAULT);
			__put_user_ret (f.l_whence, &((struct sol_flock *)A(arg))->l_whence, -EFAULT);
			__put_user_ret (f.l_start, &((struct sol_flock *)A(arg))->l_start, -EFAULT);
			__put_user_ret (f.l_len, &((struct sol_flock *)A(arg))->l_len, -EFAULT);
			__put_user_ret (f.l_pid, &((struct sol_flock *)A(arg))->l_pid, -EFAULT);
			__put_user_ret (0, &((struct sol_flock *)A(arg))->l_sysid, -EFAULT);
			return ret;
		}
	}
	return -EINVAL;
}

asmlinkage int solaris_ulimit(int cmd, int val)
{
	switch (cmd) {
	case 1: /* UL_GETFSIZE - in 512B chunks */
		return current->rlim[RLIMIT_FSIZE].rlim_cur >> 9;
	case 2: /* UL_SETFSIZE */
		if ((unsigned long)val > (LONG_MAX>>9)) return -ERANGE;
		val <<= 9;
		lock_kernel();
		if (val > current->rlim[RLIMIT_FSIZE].rlim_max) {
			if (!capable(CAP_SYS_RESOURCE)) {
				unlock_kernel();
				return -EPERM;
			}
			current->rlim[RLIMIT_FSIZE].rlim_max = val;
		}
		current->rlim[RLIMIT_FSIZE].rlim_cur = val;
		unlock_kernel();
		return 0;
	case 3: /* UL_GMEMLIM */
		return current->rlim[RLIMIT_DATA].rlim_cur;
	case 4: /* UL_GDESLIM */
		return NR_OPEN;
	}
	return -EINVAL;
}

static int chown_common(struct dentry * dentry, uid_t user, gid_t group)
{
	struct inode * inode;
	struct iattr newattrs;
	int error;

	error = -ENOENT;
	if (!(inode = dentry->d_inode)) {
		printk("chown_common: NULL inode\n");
		goto out;
	}
	error = -EROFS;
	if (IS_RDONLY(inode))
		goto out;
	error = -EPERM;
	if (IS_IMMUTABLE(inode) || IS_APPEND(inode))
		goto out;
	if (user == (uid_t) -1)
		user = inode->i_uid;
	if (group == (gid_t) -1)
		group = inode->i_gid;
	newattrs.ia_mode = inode->i_mode;
	newattrs.ia_uid = user;
	newattrs.ia_gid = group;
	newattrs.ia_valid =  ATTR_UID | ATTR_GID | ATTR_CTIME;
	/*
	 * If the owner has been changed, remove the setuid bit
	 */
	if (inode->i_mode & S_ISUID) {
		newattrs.ia_mode &= ~S_ISUID;
		newattrs.ia_valid |= ATTR_MODE;
	}
	/*
	 * If the group has been changed, remove the setgid bit
	 *
	 * Don't remove the setgid bit if no group execute bit.
	 * This is a file marked for mandatory locking.
	 */
	if (((inode->i_mode & (S_ISGID | S_IXGRP)) == (S_ISGID | S_IXGRP))) {
		newattrs.ia_mode &= ~S_ISGID;
		newattrs.ia_valid |= ATTR_MODE;
	}
	error = DQUOT_TRANSFER(dentry, &newattrs);
out:
	return error;
}

/* Linux chown works like Solaris lchown. Solaris chown does follow symlink */
asmlinkage int solaris_chown(u32 filename, s32 user, s32 group)
{
	struct dentry * dentry;
	int error;

	lock_kernel();
	dentry = namei((const char *)A(filename));

	error = PTR_ERR(dentry);
	if (!IS_ERR(dentry)) {
		error = chown_common(dentry, user, group);
		dput(dentry);
	}
	unlock_kernel();
	return error;
}

/* At least at the time I'm writing this, Linux doesn't have ACLs, so we
   just fake this */
asmlinkage int solaris_acl(u32 filename, int cmd, int nentries, u32 aclbufp)
{
	return -ENOSYS;
}

asmlinkage int solaris_facl(unsigned int fd, int cmd, int nentries, u32 aclbufp)
{
	return -ENOSYS;
}

asmlinkage int solaris_pread(unsigned int fd, char *buf, u32 count, u32 pos)
{
	ssize_t (*sys_pread)(unsigned int, char *, size_t, loff_t) =
		(ssize_t (*)(unsigned int, char *, size_t, loff_t))SYS(pread);
		
	return sys_pread(fd, buf, count, (loff_t)pos);
}

asmlinkage int solaris_pwrite(unsigned int fd, char *buf, u32 count, u32 pos)
{
	ssize_t (*sys_pwrite)(unsigned int, char *, size_t, loff_t) =
		(ssize_t (*)(unsigned int, char *, size_t, loff_t))SYS(pwrite);
		
	return sys_pwrite(fd, buf, count, (loff_t)pos);
}

/* POSIX.1 names */
#define _PC_LINK_MAX    1
#define _PC_MAX_CANON   2
#define _PC_MAX_INPUT   3
#define _PC_NAME_MAX    4
#define _PC_PATH_MAX    5
#define _PC_PIPE_BUF    6
#define _PC_NO_TRUNC    7
#define _PC_VDISABLE    8
#define _PC_CHOWN_RESTRICTED    9
/* POSIX.4 names */
#define _PC_ASYNC_IO    10
#define _PC_PRIO_IO     11
#define _PC_SYNC_IO     12
#define _PC_LAST        12

/* This is not a real and complete implementation yet, just to keep
 * the easy Solaris binaries happy.
 */
asmlinkage int solaris_fpathconf(int fd, int name)
{
	int ret;

	switch(name) {
	case _PC_LINK_MAX:
		ret = LINK_MAX;
		break;
	case _PC_MAX_CANON:
		ret = MAX_CANON;
		break;
	case _PC_MAX_INPUT:
		ret = MAX_INPUT;
		break;
	case _PC_NAME_MAX:
		ret = NAME_MAX;
		break;
	case _PC_PATH_MAX:
		ret = PATH_MAX;
		break;
	case _PC_PIPE_BUF:
		ret = PIPE_BUF;
		break;
	case _PC_CHOWN_RESTRICTED:
		ret = 1;
		break;
	case _PC_NO_TRUNC:
	case _PC_VDISABLE:
		ret = 0;
		break;
	default:
		ret = -EINVAL;
		break;
	}
	return ret;
}

asmlinkage int solaris_pathconf(u32 path, int name)
{
	return solaris_fpathconf(0, name);
}

/* solaris_llseek returns long long - quite difficult */
asmlinkage long solaris_llseek(struct pt_regs *regs, u32 off_hi, u32 off_lo, int whence)
{
	int (*sys_llseek)(unsigned int, unsigned long, unsigned long, loff_t *, unsigned int) =
		(int (*)(unsigned int, unsigned long, unsigned long, loff_t *, unsigned int))SYS(_llseek);
	int ret;
	mm_segment_t old_fs = get_fs();
	loff_t retval;
	
	set_fs(KERNEL_DS);
	ret = sys_llseek((unsigned int)regs->u_regs[UREG_I0], off_hi, off_lo, &retval, whence);
	set_fs(old_fs);
	if (ret < 0) return ret;
	regs->u_regs[UREG_I1] = (u32)retval;
	return (retval >> 32);
}

/* Have to mask out all but lower 3 bits */
asmlinkage int solaris_access(u32 filename, long mode)
{
	int (*sys_access)(const char *, int) = 
		(int (*)(const char *, int))SYS(access);
		
	return sys_access((const char *)A(filename), mode & 7);
}
