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fs.c

/* $Id: fs.c,v 1.27 2002/02/08 03:57:14 davem Exp $
 * fs.c: fs related syscall emulation for Solaris
 *
 * Copyright (C) 1997,1998 Jakub Jelinek (jj@sunsite.mff.cuni.cz)
 *
 * 1999-08-19 Implemented solaris F_FREESP (truncate)
 *            fcntl, by Jason Rappleye (rappleye@ccr.buffalo.edu)
 */

#include <linux/types.h>
#include <linux/sched.h>
#include <linux/slab.h>
#include <linux/capability.h>
#include <linux/fs.h>
#include <linux/namei.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 <linux/mount.h>
#include <linux/vfs.h>

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

#include "conv.h"

#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 __user *ubuf, struct kstat *kbuf)
{
      u32 ino;

      if (kbuf->size > MAX_NON_LFS ||
          !sysv_valid_dev(kbuf->dev) ||
          !sysv_valid_dev(kbuf->rdev))
            return -EOVERFLOW;
      ino = kbuf->ino;
      if (sizeof(ino) < sizeof(kbuf->ino) && ino != kbuf->ino)
            return -EOVERFLOW;
      if (put_user (sysv_encode_dev(kbuf->dev), &ubuf->st_dev)    ||
          __put_user (ino, &ubuf->st_ino)                   ||
          __put_user (kbuf->mode, &ubuf->st_mode)           ||
          __put_user (kbuf->nlink, &ubuf->st_nlink)   ||
          __put_user (kbuf->uid, &ubuf->st_uid)       ||
          __put_user (kbuf->gid, &ubuf->st_gid)       ||
          __put_user (sysv_encode_dev(kbuf->rdev), &ubuf->st_rdev)      ||
          __put_user (kbuf->size, &ubuf->st_size)           ||
          __put_user (kbuf->atime.tv_sec, &ubuf->st_atime.tv_sec) ||
          __put_user (kbuf->atime.tv_nsec, &ubuf->st_atime.tv_nsec)     ||
          __put_user (kbuf->mtime.tv_sec, &ubuf->st_mtime.tv_sec) ||
          __put_user (kbuf->mtime.tv_nsec, &ubuf->st_mtime.tv_nsec)     ||
          __put_user (kbuf->ctime.tv_sec, &ubuf->st_ctime.tv_sec) ||
          __put_user (kbuf->ctime.tv_nsec, &ubuf->st_ctime.tv_nsec)     ||
          __put_user (kbuf->blksize, &ubuf->st_blksize)     ||
          __put_user (kbuf->blocks, &ubuf->st_blocks) ||
          __put_user (UFSMAGIC, (unsigned __user *)ubuf->st_fstype))
            return -EFAULT;
      return 0;
}

static inline int putstat64(struct sol_stat64 __user *ubuf, struct kstat *kbuf)
{
      if (!sysv_valid_dev(kbuf->dev) || !sysv_valid_dev(kbuf->rdev))
            return -EOVERFLOW;
      if (put_user (sysv_encode_dev(kbuf->dev), &ubuf->st_dev)    ||
          __put_user (kbuf->ino, &ubuf->st_ino)       ||
          __put_user (kbuf->mode, &ubuf->st_mode)           ||
          __put_user (kbuf->nlink, &ubuf->st_nlink)   ||
          __put_user (kbuf->uid, &ubuf->st_uid)       ||
          __put_user (kbuf->gid, &ubuf->st_gid)       ||
          __put_user (sysv_encode_dev(kbuf->rdev), &ubuf->st_rdev)      ||
          __put_user (kbuf->size, &ubuf->st_size)           ||
          __put_user (kbuf->atime.tv_sec, &ubuf->st_atime.tv_sec) ||
          __put_user (kbuf->atime.tv_nsec, &ubuf->st_atime.tv_nsec)     ||
          __put_user (kbuf->mtime.tv_sec, &ubuf->st_mtime.tv_sec) ||
          __put_user (kbuf->mtime.tv_nsec, &ubuf->st_mtime.tv_nsec)     ||
          __put_user (kbuf->ctime.tv_sec, &ubuf->st_ctime.tv_sec) ||
          __put_user (kbuf->ctime.tv_nsec, &ubuf->st_ctime.tv_nsec)     ||
          __put_user (kbuf->blksize, &ubuf->st_blksize)     ||
          __put_user (kbuf->blocks, &ubuf->st_blocks) ||
          __put_user (UFSMAGIC, (unsigned __user *)ubuf->st_fstype))
            return -EFAULT;
      return 0;
}

asmlinkage int solaris_stat(u32 filename, u32 statbuf)
{
      struct kstat s;
      int ret = vfs_stat(A(filename), &s);
      if (!ret)
            return putstat(A(statbuf), &s);
      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)
{
      struct kstat s;
      int ret = vfs_stat(A(filename), &s);
      if (!ret)
            return putstat64(A(statbuf), &s);
      return ret;
}

asmlinkage int solaris_lstat(u32 filename, u32 statbuf)
{
      struct kstat s;
      int ret = vfs_lstat(A(filename), &s);
      if (!ret)
            return putstat(A(statbuf), &s);
      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)
{
      struct kstat s;
      int ret = vfs_lstat(A(filename), &s);
      if (!ret)
            return putstat64(A(statbuf), &s);
      return ret;
}

asmlinkage int solaris_fstat(unsigned int fd, u32 statbuf)
{
      struct kstat s;
      int ret = vfs_fstat(fd, &s);
      if (!ret)
            return putstat(A(statbuf), &s);
      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)
{
      struct kstat s;
      int ret = vfs_fstat(fd, &s);
      if (!ret)
            return putstat64(A(statbuf), &s);
      return ret;
}

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

      /* minor is guaranteed to be OK for MKDEV, major might be not */
      if (major > 0xfff)
            return -EINVAL;
      return sys_mknod(A(path), mode, new_encode_dev(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 __user *dirent, unsigned int count)
{
      int (*sys_getdents)(unsigned int, void __user *, unsigned int) =
            (int (*)(unsigned int, void __user *, 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 __user *,struct statfs __user *) = 
            (int (*)(const char __user *,struct statfs __user *))SYS(statfs);
      struct sol_statfs __user *ss = A(buf);
      
      if (len != sizeof(struct sol_statfs)) return -EINVAL;
      if (!fstype) {
            /* FIXME: mixing userland and kernel pointers */
            set_fs (KERNEL_DS);
            ret = sys_statfs(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 __user *) = 
            (int (*)(unsigned,struct statfs __user *))SYS(fstatfs);
      struct sol_statfs __user *ss = 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 vfsmount *mnt, struct inode *inode, u32 buf)
{
      struct kstatfs s;
      int error;
      struct sol_statvfs __user *ss = A(buf);

      error = vfs_statfs(mnt->mnt_root, &s);
      if (!error) {
            const char *p = mnt->mnt_sb->s_type->name;
            int i = 0;
            int j = strlen (p);
            
            if (j > 15) j = 15;
            if (IS_RDONLY(inode)) i = 1;
            if (mnt->mnt_flags & MNT_NOSUID) i |= 2;
            if (!sysv_valid_dev(inode->i_sb->s_dev))
                  return -EOVERFLOW;
            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 (sysv_encode_dev(inode->i_sb->s_dev), &ss->f_fsid) ||
                __copy_to_user (ss->f_basetype,p,j)         ||
                __put_user (0, (char __user *)&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 vfsmount *mnt, struct inode *inode, u32 buf)
{
      struct kstatfs s;
      int error;
      struct sol_statvfs64 __user *ss = A(buf);
                  
      error = vfs_statfs(mnt->mnt_root, &s);
      if (!error) {
            const char *p = mnt->mnt_sb->s_type->name;
            int i = 0;
            int j = strlen (p);
            
            if (j > 15) j = 15;
            if (IS_RDONLY(inode)) i = 1;
            if (mnt->mnt_flags & MNT_NOSUID) i |= 2;
            if (!sysv_valid_dev(inode->i_sb->s_dev))
                  return -EOVERFLOW;
            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 (sysv_encode_dev(inode->i_sb->s_dev), &ss->f_fsid) ||
                __copy_to_user (ss->f_basetype,p,j)         ||
                __put_user (0, (char __user *)&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 nameidata nd;
      int error;

      error = user_path_walk(A(path),&nd);
      if (!error) {
            struct inode * inode = nd.dentry->d_inode;
            error = report_statvfs(nd.mnt, inode, buf);
            path_release(&nd);
      }
      return error;
}

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

      error = -EBADF;
      file = fget(fd);
      if (file) {
            error = report_statvfs(file->f_path.mnt, file->f_path.dentry->d_inode, buf);
            fput(file);
      }

      return error;
}

asmlinkage int solaris_statvfs64(u32 path, u32 buf)
{
      struct nameidata nd;
      int error;

      lock_kernel();
      error = user_path_walk(A(path), &nd);
      if (!error) {
            struct inode * inode = nd.dentry->d_inode;
            error = report_statvfs64(nd.mnt, inode, buf);
            path_release(&nd);
      }
      unlock_kernel();
      return error;
}

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

      error = -EBADF;
      file = fget(fd);
      if (file) {
            lock_kernel();
            error = report_statvfs64(file->f_path.mnt, file->f_path.dentry->d_inode, buf);
            unlock_kernel();
            fput(file);
      }
      return error;
}

extern asmlinkage long sparc32_open(const char * filename, int flags, int mode);

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

      /* Translate flags first. */
      if (flags & 0x2000) fl |= O_LARGEFILE;
      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;
      flags = fl;

      return sparc32_open(filename, flags, 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;
                  struct sol_flock __user *p = A(arg);
                  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;
                  }

                  if (get_user (f.l_type, &p->l_type) ||
                      __get_user (f.l_whence, &p->l_whence) ||
                      __get_user (f.l_start, &p->l_start) ||
                      __get_user (f.l_len, &p->l_len) ||
                      __get_user (f.l_pid, &p->l_sysid))
                        return -EFAULT;

                  set_fs(KERNEL_DS);
                  ret = sys_fcntl(fd, cmd, (unsigned long)&f);
                  set_fs(old_fs);

                  if (__put_user (f.l_type, &p->l_type) ||
                      __put_user (f.l_whence, &p->l_whence) ||
                      __put_user (f.l_start, &p->l_start) ||
                      __put_user (f.l_len, &p->l_len) ||
                      __put_user (f.l_pid, &p->l_pid) ||
                      __put_user (0, &p->l_sysid))
                        return -EFAULT;

                  return ret;
            }
      case SOL_F_FREESP:
              { 
                int length;
                int (*sys_newftruncate)(unsigned int, unsigned long)=
                      (int (*)(unsigned int, unsigned long))SYS(ftruncate);

                if (get_user(length, &((struct sol_flock __user *)A(arg))->l_start))
                      return -EFAULT;

                return sys_newftruncate(fd, length);
            }
      };
      return -EINVAL;
}

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

/* 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 __user *buf, u32 count, u32 pos)
{
      ssize_t (*sys_pread64)(unsigned int, char __user *, size_t, loff_t) =
            (ssize_t (*)(unsigned int, char __user *, size_t, loff_t))SYS(pread64);

      return sys_pread64(fd, buf, count, (loff_t)pos);
}

asmlinkage int solaris_pwrite(unsigned int fd, char __user *buf, u32 count, u32 pos)
{
      ssize_t (*sys_pwrite64)(unsigned int, char __user *, size_t, loff_t) =
            (ssize_t (*)(unsigned int, char __user *, size_t, loff_t))SYS(pwrite64);

      return sys_pwrite64(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 __user *, unsigned int) =
            (int (*)(unsigned int, unsigned long, unsigned long, loff_t __user *, 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 __user *, int) = 
            (int (*)(const char __user *, int))SYS(access);
            
      return sys_access(A(filename), mode & 7);
}

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