libc/winsup/cygwin/mount.h

/* mount.h: mount definitions.

   Copyright 1996, 1997, 1998, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007,
   2008, 2009, 2010, 2011, 2012, 2013 Red Hat, Inc.

This file is part of Cygwin.

This software is a copyrighted work licensed under the terms of the
Cygwin license.  Please consult the file "CYGWIN_LICENSE" for
details. */

#ifndef _MOUNT_H
#define _MOUNT_H

enum disk_type
{
  DT_NODISK,
  DT_CDROM,
  DT_FLOPPY,
  DT_HARDDISK,
  DT_SHARE_SMB,
  DT_SHARE_NFS
};

disk_type get_disk_type (LPCWSTR);

/* Don't add new fs types without adding them to fs_names in mount.cc!
   Don't reorder without reordering fs_names in mount.cc! */
enum fs_info_type
{
  none = 0,
  fat,
  ntfs,
  refs,
  samba,
  nfs,
  netapp,
  cdrom,
  udf,
  csc_cache,
  sunwnfs,
  unixfs,
  mvfs,
  cifs,
  nwfs,
  ncfsd,
  afs,
  /* Always last. */
  max_fs_type
};

extern struct fs_names_t {
    const char *name;
    bool block_device;
} fs_names[];

#define IMPLEMENT_FS_FLAG(type) \
  bool is_##type (bool val) { if (val) status.fs_type = type; return val; } \
  bool is_##type () const   { return status.fs_type == type; }

class fs_info
{
  struct status_flags
  {
    ULONG flags;		/* Volume flags */
    ULONG samba_version;	/* Samba version if available */
    ULONG name_len;		/* MaximumComponentNameLength */
    fs_info_type fs_type;	/* Filesystem type */
    unsigned is_remote_drive		: 1;
    unsigned has_acls			: 1;
    unsigned hasgood_inode		: 1;
    unsigned caseinsensitive		: 1;
    unsigned has_buggy_open		: 1;
    unsigned has_buggy_reopen		: 1;
    unsigned has_buggy_fileid_dirinfo	: 1;
    unsigned has_buggy_basic_info	: 1;
    unsigned has_dos_filenames_only	: 1;
  } status;
  ULONG sernum;			/* Volume Serial Number */
  char fsn[80];			/* Windows filesystem name */

 public:
  void clear ()
  {
    memset (&status, 0 , sizeof status);
    sernum = 0UL;
    fsn[0] = '\0';
  }
  fs_info () { clear (); }

  IMPLEMENT_STATUS_FLAG (ULONG, flags)
  IMPLEMENT_STATUS_FLAG (ULONG, samba_version)
  IMPLEMENT_STATUS_FLAG (ULONG, name_len)
  IMPLEMENT_STATUS_FLAG (bool, is_remote_drive)
  IMPLEMENT_STATUS_FLAG (bool, has_acls)
  IMPLEMENT_STATUS_FLAG (bool, hasgood_inode)
  IMPLEMENT_STATUS_FLAG (bool, caseinsensitive)
  IMPLEMENT_STATUS_FLAG (bool, has_buggy_open)
  IMPLEMENT_STATUS_FLAG (bool, has_buggy_reopen)
  IMPLEMENT_STATUS_FLAG (bool, has_buggy_fileid_dirinfo)
  IMPLEMENT_STATUS_FLAG (bool, has_buggy_basic_info)
  IMPLEMENT_STATUS_FLAG (bool, has_dos_filenames_only)
  IMPLEMENT_FS_FLAG (fat)
  IMPLEMENT_FS_FLAG (ntfs)
  IMPLEMENT_FS_FLAG (refs)
  IMPLEMENT_FS_FLAG (samba)
  IMPLEMENT_FS_FLAG (nfs)
  IMPLEMENT_FS_FLAG (netapp)
  IMPLEMENT_FS_FLAG (cdrom)
  IMPLEMENT_FS_FLAG (udf)
  IMPLEMENT_FS_FLAG (csc_cache)
  IMPLEMENT_FS_FLAG (sunwnfs)
  IMPLEMENT_FS_FLAG (unixfs)
  IMPLEMENT_FS_FLAG (mvfs)
  IMPLEMENT_FS_FLAG (cifs)
  IMPLEMENT_FS_FLAG (nwfs)
  IMPLEMENT_FS_FLAG (ncfsd)
  IMPLEMENT_FS_FLAG (afs)
  fs_info_type what_fs () const { return status.fs_type; }
  bool got_fs () const { return status.fs_type != none; }

  ULONG serial_number () const { return sernum; }

  const char *fsname () const { return fsn[0] ? fsn : "unknown"; }

  bool __reg3 update (PUNICODE_STRING, HANDLE);
  bool inited () const { return !!status.flags; }
};

/* Mount table entry */

class mount_item
{
 public:
  /* FIXME: Nasty static allocation.  Need to have a heap in the shared
     area [with the user being able to configure at runtime the max size].  */
  /* Win32-style mounted partition source ("C:\foo\bar").
     native_path[0] == 0 for unused entries.  */
  char native_path[CYG_MAX_PATH];
  int native_pathlen;

  /* POSIX-style mount point ("/foo/bar") */
  char posix_path[CYG_MAX_PATH];
  int posix_pathlen;

  unsigned flags;

  void init (const char *dev, const char *path, unsigned flags);

  struct mntent *getmntent ();
  int build_win32 (char *, const char *, unsigned *, unsigned);
};

/* Warning: Decreasing this value will cause cygwin.dll to ignore existing
   higher numbered registry entries.  Don't change this number willy-nilly.
   What we need is to have a more dynamic allocation scheme, but the current
   scheme should be satisfactory for a long while yet.  */
#define MAX_MOUNTS 64

class reg_key;
struct device;

/* NOTE: Do not make gratuitous changes to the names or organization of the
   below class.  The layout is checksummed to determine compatibility between
   different cygwin versions. */
class mount_info
{
 public:
  int nmounts;
  mount_item mount[MAX_MOUNTS];

  static bool got_usr_bin;
  static bool got_usr_lib;
  static int root_idx;

  /* cygdrive_prefix is used as the root of the path automatically
     prepended to a path when the path has no associated mount.
     cygdrive_flags are the default flags for the cygdrives. */
  char cygdrive[CYG_MAX_PATH];
  size_t cygdrive_len;
  unsigned cygdrive_flags;
 private:
  int posix_sorted[MAX_MOUNTS];
  int native_sorted[MAX_MOUNTS];

 public:
  void init ();
  int add_item (const char *dev, const char *path, unsigned flags);
  int del_item (const char *path, unsigned flags);

  unsigned set_flags_from_win32_path (const char *path);
  int conv_to_win32_path (const char *src_path, char *dst, device&,
			  unsigned *flags = NULL);
  int conv_to_posix_path (PWCHAR src_path, char *posix_path,
			  int keep_rel_p);
  int conv_to_posix_path (const char *src_path, char *posix_path,
			  int keep_rel_p);
  struct mntent *getmntent (int x);

  int write_cygdrive_info (const char *cygdrive_prefix, unsigned flags);
  int get_cygdrive_info (char *user, char *system, char* user_flags,
			 char* system_flags);
  void cygdrive_posix_path (const char *src, char *dst, int trailing_slash_p);
  int get_mounts_here (const char *parent_dir, int,
		       PUNICODE_STRING mount_points,
		       PUNICODE_STRING cygd);

 private:
  void sort ();
  void mount_slash ();
  void create_root_entry (const PWCHAR root);

  bool from_fstab_line (char *line, bool user);
  bool from_fstab (bool user, WCHAR [], PWCHAR);

  int cygdrive_win32_path (const char *src, char *dst, int& unit);
};

class dos_drive_mappings
{
  struct mapping
  {
    mapping *next;
    size_t doslen;
    size_t ntlen;
    wchar_t *dospath;
    wchar_t *ntdevpath;
  };
  mapping *mappings;

public:
  dos_drive_mappings ();
  ~dos_drive_mappings ();
  wchar_t *fixup_if_match (wchar_t *path);
};
#endif