2345b582f2
wrong value in condition.
2520 lines
74 KiB
C++
2520 lines
74 KiB
C++
/* fhandler_disk_file.cc
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Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004,
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2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012 Red Hat, Inc.
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This file is part of Cygwin.
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This software is a copyrighted work licensed under the terms of the
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Cygwin license. Please consult the file "CYGWIN_LICENSE" for
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details. */
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#include "winsup.h"
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#include <stdlib.h>
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#include <sys/acl.h>
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#include <sys/statvfs.h>
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#include "cygerrno.h"
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#include "security.h"
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#include "path.h"
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#include "fhandler.h"
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#include "dtable.h"
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#include "cygheap.h"
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#include "shared_info.h"
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#include "pinfo.h"
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#include "ntdll.h"
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#include "tls_pbuf.h"
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#include "pwdgrp.h"
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#include <winioctl.h>
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#include <lm.h>
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#include "devices.h"
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#define _COMPILING_NEWLIB
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#include <dirent.h>
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class __DIR_mounts
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{
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int count;
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const char *parent_dir;
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int parent_dir_len;
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UNICODE_STRING mounts[MAX_MOUNTS];
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bool found[MAX_MOUNTS + 3];
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UNICODE_STRING cygdrive;
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#define __DIR_PROC (MAX_MOUNTS)
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#define __DIR_CYGDRIVE (MAX_MOUNTS+1)
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#define __DIR_DEV (MAX_MOUNTS+2)
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__ino64_t eval_ino (int idx)
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{
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__ino64_t ino = 0;
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char fname[parent_dir_len + mounts[idx].Length + 2];
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struct __stat64 st;
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char *c = stpcpy (fname, parent_dir);
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if (c[- 1] != '/')
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*c++ = '/';
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sys_wcstombs (c, mounts[idx].Length + 1,
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mounts[idx].Buffer, mounts[idx].Length / sizeof (WCHAR));
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path_conv pc (fname, PC_SYM_NOFOLLOW | PC_POSIX | PC_KEEP_HANDLE);
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if (!stat_worker (pc, &st))
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ino = st.st_ino;
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return ino;
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}
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public:
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__DIR_mounts (const char *posix_path)
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: parent_dir (posix_path)
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{
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parent_dir_len = strlen (parent_dir);
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count = mount_table->get_mounts_here (parent_dir, parent_dir_len, mounts,
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&cygdrive);
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rewind ();
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}
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~__DIR_mounts ()
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{
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for (int i = 0; i < count; ++i)
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RtlFreeUnicodeString (&mounts[i]);
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RtlFreeUnicodeString (&cygdrive);
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}
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__ino64_t check_mount (PUNICODE_STRING fname, __ino64_t ino,
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bool eval = true)
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{
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if (parent_dir_len == 1) /* root dir */
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{
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if (RtlEqualUnicodeString (fname, &ro_u_proc, FALSE))
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{
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found[__DIR_PROC] = true;
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return 2;
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}
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if (RtlEqualUnicodeString (fname, &ro_u_dev, FALSE))
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{
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found[__DIR_DEV] = true;
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return 2;
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}
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if (fname->Length / sizeof (WCHAR) == mount_table->cygdrive_len - 2
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&& RtlEqualUnicodeString (fname, &cygdrive, FALSE))
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{
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found[__DIR_CYGDRIVE] = true;
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return 2;
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}
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}
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for (int i = 0; i < count; ++i)
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if (RtlEqualUnicodeString (fname, &mounts[i], FALSE))
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{
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found[i] = true;
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return eval ? eval_ino (i) : 1;
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}
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return ino;
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}
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__ino64_t check_missing_mount (PUNICODE_STRING retname = NULL)
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{
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for (int i = 0; i < count; ++i)
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if (!found[i])
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{
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found[i] = true;
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if (retname)
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{
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*retname = mounts[i];
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return eval_ino (i);
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}
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return 1;
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}
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if (parent_dir_len == 1) /* root dir */
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{
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if (!found[__DIR_PROC])
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{
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found[__DIR_PROC] = true;
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if (retname)
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*retname = ro_u_proc;
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return 2;
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}
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if (!found[__DIR_DEV])
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{
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found[__DIR_DEV] = true;
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if (retname)
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*retname = ro_u_dev;
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return 2;
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}
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if (!found[__DIR_CYGDRIVE])
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{
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found[__DIR_CYGDRIVE] = true;
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if (cygdrive.Length > 0)
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{
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if (retname)
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*retname = cygdrive;
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return 2;
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}
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}
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}
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return 0;
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}
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void rewind () { memset (found, 0, sizeof found); }
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};
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inline bool
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path_conv::isgood_inode (__ino64_t ino) const
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{
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/* If the FS doesn't support nonambiguous inode numbers anyway, bail out
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immediately. */
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if (!hasgood_inode ())
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return false;
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/* If the inode numbers are 64 bit numbers or if it's a local FS, they
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are to be trusted. */
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if (ino > UINT32_MAX || !isremote ())
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return true;
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/* The inode numbers returned from a remote NT4 NTFS are ephemeral
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32 bit numbers. */
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if (fs_is_ntfs ())
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return false;
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/* Starting with version 3.5.4, Samba returns the real inode numbers, if
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the file is on the same device as the root of the share (Samba function
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get_FileIndex). 32 bit inode numbers returned by older versions (likely
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< 3.0) are ephemeral. */
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if (fs_is_samba () && fs.samba_version () < 0x03050400)
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return false;
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/* Otherwise, trust the inode numbers unless proved otherwise. */
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return true;
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}
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/* Check reparse point for type. IO_REPARSE_TAG_MOUNT_POINT types are
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either volume mount points, which are treated as directories, or they
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are directory mount points, which are treated as symlinks.
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IO_REPARSE_TAG_SYMLINK types are always symlinks. We don't know
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anything about other reparse points, so they are treated as unknown. */
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static inline int
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readdir_check_reparse_point (POBJECT_ATTRIBUTES attr)
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{
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DWORD ret = DT_UNKNOWN;
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IO_STATUS_BLOCK io;
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HANDLE reph;
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UNICODE_STRING subst;
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if (NT_SUCCESS (NtOpenFile (&reph, READ_CONTROL, attr, &io,
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FILE_SHARE_VALID_FLAGS,
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FILE_OPEN_FOR_BACKUP_INTENT
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| FILE_OPEN_REPARSE_POINT)))
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{
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PREPARSE_DATA_BUFFER rp = (PREPARSE_DATA_BUFFER)
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alloca (MAXIMUM_REPARSE_DATA_BUFFER_SIZE);
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if (NT_SUCCESS (NtFsControlFile (reph, NULL, NULL, NULL,
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&io, FSCTL_GET_REPARSE_POINT, NULL, 0,
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(LPVOID) rp, MAXIMUM_REPARSE_DATA_BUFFER_SIZE)))
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{
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if (rp->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT)
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{
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RtlInitCountedUnicodeString (&subst,
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(WCHAR *)((char *)rp->MountPointReparseBuffer.PathBuffer
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+ rp->MountPointReparseBuffer.SubstituteNameOffset),
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rp->MountPointReparseBuffer.SubstituteNameLength);
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/* Only volume mountpoints are treated as directories. */
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if (RtlEqualUnicodePathPrefix (&subst, &ro_u_volume, TRUE))
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ret = DT_DIR;
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else
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ret = DT_LNK;
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}
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else if (rp->ReparseTag == IO_REPARSE_TAG_SYMLINK)
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ret = DT_LNK;
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NtClose (reph);
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}
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}
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return ret;
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}
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inline __ino64_t
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path_conv::get_ino_by_handle (HANDLE hdl)
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{
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IO_STATUS_BLOCK io;
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FILE_INTERNAL_INFORMATION fai;
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if (NT_SUCCESS (NtQueryInformationFile (hdl, &io, &fai, sizeof fai,
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FileInternalInformation))
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&& isgood_inode (fai.FileId.QuadPart))
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return fai.FileId.QuadPart;
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return 0;
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}
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#if 0
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/* This function is obsolete. We're keeping it in so we don't forget
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that we already did all that at one point. */
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unsigned __stdcall
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path_conv::ndisk_links (DWORD nNumberOfLinks)
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{
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if (!isdir () || isremote ())
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return nNumberOfLinks;
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OBJECT_ATTRIBUTES attr;
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IO_STATUS_BLOCK io;
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HANDLE fh;
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if (!NT_SUCCESS (NtOpenFile (&fh, SYNCHRONIZE | FILE_LIST_DIRECTORY,
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get_object_attr (attr, sec_none_nih),
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&io, FILE_SHARE_VALID_FLAGS,
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FILE_SYNCHRONOUS_IO_NONALERT
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| FILE_OPEN_FOR_BACKUP_INTENT
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| FILE_DIRECTORY_FILE)))
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return nNumberOfLinks;
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unsigned count = 0;
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bool first = true;
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PFILE_BOTH_DIRECTORY_INFORMATION fdibuf = (PFILE_BOTH_DIRECTORY_INFORMATION)
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alloca (65536);
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__DIR_mounts *dir = new __DIR_mounts (normalized_path);
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while (NT_SUCCESS (NtQueryDirectoryFile (fh, NULL, NULL, NULL, &io, fdibuf,
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65536, FileBothDirectoryInformation,
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FALSE, NULL, first)))
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{
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if (first)
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{
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first = false;
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/* All directories have . and .. as their first entries.
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If . is not present as first entry, we're on a drive's
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root direcotry, which doesn't have these entries. */
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if (fdibuf->FileNameLength != 2 || fdibuf->FileName[0] != L'.')
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count = 2;
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}
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for (PFILE_BOTH_DIRECTORY_INFORMATION pfdi = fdibuf;
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pfdi;
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pfdi = (PFILE_BOTH_DIRECTORY_INFORMATION)
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(pfdi->NextEntryOffset ? (PBYTE) pfdi + pfdi->NextEntryOffset
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: NULL))
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{
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switch (pfdi->FileAttributes
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& (FILE_ATTRIBUTE_DIRECTORY | FILE_ATTRIBUTE_REPARSE_POINT))
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{
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case FILE_ATTRIBUTE_DIRECTORY:
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/* Just a directory */
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++count;
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break;
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case FILE_ATTRIBUTE_DIRECTORY | FILE_ATTRIBUTE_REPARSE_POINT:
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/* Volume mount point or symlink to directory */
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{
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UNICODE_STRING fname;
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RtlInitCountedUnicodeString (&fname, pfdi->FileName,
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pfdi->FileNameLength);
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InitializeObjectAttributes (&attr, &fname,
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objcaseinsensitive (), fh, NULL);
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if (is_volume_mountpoint (&attr))
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++count;
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}
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break;
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default:
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break;
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}
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UNICODE_STRING fname;
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RtlInitCountedUnicodeString (&fname, pfdi->FileName,
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pfdi->FileNameLength);
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dir->check_mount (&fname, 0, false);
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}
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}
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while (dir->check_missing_mount ())
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++count;
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NtClose (fh);
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delete dir;
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return count;
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}
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#endif
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/* For files on NFS shares, we request an EA of type NfsV3Attributes.
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This returns the content of a struct fattr3 as defined in RFC 1813.
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The content is the NFS equivalent of struct stat. so there's not much
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to do here except for copying. */
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int __stdcall
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fhandler_base::fstat_by_nfs_ea (struct __stat64 *buf)
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{
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fattr3 *nfs_attr = pc.nfsattr ();
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if (get_io_handle ())
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{
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/* NFS stumbles over its own caching. If you write to the file,
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a subsequent fstat does not return the actual size of the file,
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but the size at the time the handle has been opened. Unless
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access through another handle invalidates the caching within the
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NFS client. */
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if (get_access () & GENERIC_WRITE)
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FlushFileBuffers (get_io_handle ());
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nfs_fetch_fattr3 (get_io_handle (), nfs_attr);
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}
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buf->st_dev = nfs_attr->fsid;
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buf->st_ino = nfs_attr->fileid;
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buf->st_mode = (nfs_attr->mode & 0xfff)
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| nfs_type_mapping[nfs_attr->type & 7];
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buf->st_nlink = nfs_attr->nlink;
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/* FIXME: How to convert UNIX uid/gid to Windows SIDs? */
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#if 0
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buf->st_uid = nfs_attr->uid;
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buf->st_gid = nfs_attr->gid;
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#else
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buf->st_uid = myself->uid;
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buf->st_gid = myself->gid;
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#endif
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buf->st_rdev = makedev (nfs_attr->rdev.specdata1,
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nfs_attr->rdev.specdata2);
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buf->st_size = nfs_attr->size;
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buf->st_blksize = PREFERRED_IO_BLKSIZE;
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buf->st_blocks = (nfs_attr->used + S_BLKSIZE - 1) / S_BLKSIZE;
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buf->st_atim = nfs_attr->atime;
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buf->st_mtim = nfs_attr->mtime;
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buf->st_ctim = nfs_attr->ctime;
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return 0;
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}
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int __stdcall
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fhandler_base::fstat_by_handle (struct __stat64 *buf)
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{
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/* Don't use FileAllInformation info class. It returns a pathname rather
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than a filename, so it needs a really big buffer for no good reason
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since we don't need the name anyway. So we just call the three info
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classes necessary to get all information required by stat(2). */
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FILE_STANDARD_INFORMATION fsi;
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FILE_INTERNAL_INFORMATION fii;
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HANDLE h = get_stat_handle ();
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NTSTATUS status = 0;
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IO_STATUS_BLOCK io;
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/* If the file has been opened for other purposes than stat, we can't rely
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on the information stored in pc.fnoi. So we overwrite them here. */
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if (get_io_handle ())
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{
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status = file_get_fnoi (h, pc.fs_is_netapp (), pc.fnoi ());
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if (!NT_SUCCESS (status))
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{
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debug_printf ("%p = NtQueryInformationFile(%S, "
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"FileNetworkOpenInformation)",
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status, pc.get_nt_native_path ());
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return -1;
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}
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}
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if (!pc.hasgood_inode ())
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fsi.NumberOfLinks = 1;
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else
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{
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status = NtQueryInformationFile (h, &io, &fsi, sizeof fsi,
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FileStandardInformation);
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if (!NT_SUCCESS (status))
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{
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debug_printf ("%p = NtQueryInformationFile(%S, "
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"FileStandardInformation)",
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status, pc.get_nt_native_path ());
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return -1;
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}
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if (!ino)
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{
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status = NtQueryInformationFile (h, &io, &fii, sizeof fii,
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FileInternalInformation);
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if (!NT_SUCCESS (status))
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{
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debug_printf ("%p = NtQueryInformationFile(%S, "
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"FileInternalInformation)",
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status, pc.get_nt_native_path ());
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return -1;
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}
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else if (pc.isgood_inode (fii.FileId.QuadPart))
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ino = fii.FileId.QuadPart;
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}
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}
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return fstat_helper (buf, fsi.NumberOfLinks);
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}
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|
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int __stdcall
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fhandler_base::fstat_by_name (struct __stat64 *buf)
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{
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NTSTATUS status;
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OBJECT_ATTRIBUTES attr;
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IO_STATUS_BLOCK io;
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UNICODE_STRING dirname;
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UNICODE_STRING basename;
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HANDLE dir;
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struct {
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FILE_ID_BOTH_DIR_INFORMATION fdi;
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WCHAR buf[NAME_MAX + 1];
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} fdi_buf;
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|
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if (!ino && pc.hasgood_inode () && !pc.has_buggy_fileid_dirinfo ())
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{
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RtlSplitUnicodePath (pc.get_nt_native_path (), &dirname, &basename);
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InitializeObjectAttributes (&attr, &dirname, pc.objcaseinsensitive (),
|
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NULL, NULL);
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status = NtOpenFile (&dir, SYNCHRONIZE | FILE_LIST_DIRECTORY,
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&attr, &io, FILE_SHARE_VALID_FLAGS,
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FILE_SYNCHRONOUS_IO_NONALERT
|
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| FILE_OPEN_FOR_BACKUP_INTENT
|
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| FILE_DIRECTORY_FILE);
|
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if (!NT_SUCCESS (status))
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debug_printf ("%p = NtOpenFile(%S)", status,
|
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pc.get_nt_native_path ());
|
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else
|
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{
|
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status = NtQueryDirectoryFile (dir, NULL, NULL, NULL, &io,
|
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&fdi_buf.fdi, sizeof fdi_buf,
|
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FileIdBothDirectoryInformation,
|
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TRUE, &basename, TRUE);
|
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NtClose (dir);
|
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if (!NT_SUCCESS (status))
|
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debug_printf ("%p = NtQueryDirectoryFile(%S)", status,
|
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pc.get_nt_native_path ());
|
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else
|
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ino = fdi_buf.fdi.FileId.QuadPart;
|
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}
|
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}
|
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return fstat_helper (buf, 1);
|
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}
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|
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int __stdcall
|
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fhandler_base::fstat_fs (struct __stat64 *buf)
|
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{
|
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int res = -1;
|
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int oret;
|
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int open_flags = O_RDONLY | O_BINARY;
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|
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if (get_stat_handle ())
|
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{
|
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if (!nohandle () && !is_fs_special ())
|
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res = pc.fs_is_nfs () ? fstat_by_nfs_ea (buf) : fstat_by_handle (buf);
|
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if (res)
|
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res = fstat_by_name (buf);
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return res;
|
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}
|
|
/* First try to open with generic read access. This allows to read the file
|
|
in fstat_helper (when checking for executability) without having to
|
|
re-open it. Opening a file can take a lot of time on network drives
|
|
so we try to avoid that. */
|
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oret = open_fs (open_flags, 0);
|
|
if (!oret)
|
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{
|
|
query_open (query_read_attributes);
|
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oret = open_fs (open_flags, 0);
|
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}
|
|
if (oret)
|
|
{
|
|
/* We now have a valid handle, regardless of the "nohandle" state.
|
|
Since fhandler_base::open only calls CloseHandle if !nohandle,
|
|
we have to set it to false before calling close and restore
|
|
the state afterwards. */
|
|
res = pc.fs_is_nfs () ? fstat_by_nfs_ea (buf) : fstat_by_handle (buf);
|
|
bool no_handle = nohandle ();
|
|
nohandle (false);
|
|
close_fs ();
|
|
nohandle (no_handle);
|
|
set_io_handle (NULL);
|
|
}
|
|
if (res)
|
|
res = fstat_by_name (buf);
|
|
|
|
return res;
|
|
}
|
|
|
|
int __stdcall
|
|
fhandler_base::fstat_helper (struct __stat64 *buf,
|
|
DWORD nNumberOfLinks)
|
|
{
|
|
IO_STATUS_BLOCK st;
|
|
FILE_COMPRESSION_INFORMATION fci;
|
|
HANDLE h = get_stat_handle ();
|
|
PFILE_NETWORK_OPEN_INFORMATION pfnoi = pc.fnoi ();
|
|
ULONG attributes = pc.file_attributes ();
|
|
|
|
to_timestruc_t ((PFILETIME) &pfnoi->LastAccessTime, &buf->st_atim);
|
|
to_timestruc_t ((PFILETIME) &pfnoi->LastWriteTime, &buf->st_mtim);
|
|
/* If the ChangeTime is 0, the underlying FS doesn't support this timestamp
|
|
(FAT for instance). If so, it's faked using LastWriteTime. */
|
|
to_timestruc_t (pfnoi->ChangeTime.QuadPart ? (PFILETIME) &pfnoi->ChangeTime
|
|
: (PFILETIME) &pfnoi->LastWriteTime,
|
|
&buf->st_ctim);
|
|
to_timestruc_t ((PFILETIME) &pfnoi->CreationTime, &buf->st_birthtim);
|
|
buf->st_dev = get_dev ();
|
|
/* CV 2011-01-13: Observations on the Cygwin mailing list point to an
|
|
interesting behaviour in some Windows versions. Apparently the size of
|
|
a directory is computed at the time the directory is first scanned. This
|
|
can result in two subsequent NtQueryInformationFile calls to return size
|
|
0 in the first call and size > 0 in the second call. This in turn can
|
|
affect applications like newer tar.
|
|
FIXME: Is the allocation size affected as well? */
|
|
buf->st_size = pc.isdir () ? 0 : (_off64_t) pfnoi->EndOfFile.QuadPart;
|
|
/* The number of links to a directory includes the number of subdirectories
|
|
in the directory, since all those subdirectories point to it. However,
|
|
this is painfully slow, so we do without it. */
|
|
#if 0
|
|
buf->st_nlink = pc.ndisk_links (nNumberOfLinks);
|
|
#else
|
|
buf->st_nlink = nNumberOfLinks;
|
|
#endif
|
|
|
|
/* Enforce namehash as inode number on untrusted file systems. */
|
|
if (ino && pc.isgood_inode (ino))
|
|
buf->st_ino = (__ino64_t) ino;
|
|
else
|
|
buf->st_ino = get_ino ();
|
|
|
|
buf->st_blksize = PREFERRED_IO_BLKSIZE;
|
|
|
|
if (pfnoi->AllocationSize.QuadPart >= 0LL)
|
|
/* A successful NtQueryInformationFile returns the allocation size
|
|
correctly for compressed and sparse files as well. */
|
|
buf->st_blocks = (pfnoi->AllocationSize.QuadPart + S_BLKSIZE - 1)
|
|
/ S_BLKSIZE;
|
|
else if (::has_attribute (attributes, FILE_ATTRIBUTE_COMPRESSED
|
|
| FILE_ATTRIBUTE_SPARSE_FILE)
|
|
&& h && !is_fs_special ()
|
|
&& !NtQueryInformationFile (h, &st, (PVOID) &fci, sizeof fci,
|
|
FileCompressionInformation))
|
|
/* Otherwise we request the actual amount of bytes allocated for
|
|
compressed and sparsed files. */
|
|
buf->st_blocks = (fci.CompressedFileSize.QuadPart + S_BLKSIZE - 1)
|
|
/ S_BLKSIZE;
|
|
else
|
|
/* Otherwise compute no. of blocks from file size. */
|
|
buf->st_blocks = (buf->st_size + S_BLKSIZE - 1) / S_BLKSIZE;
|
|
|
|
buf->st_mode = 0;
|
|
/* Using a side effect: get_file_attributes checks for directory.
|
|
This is used, to set S_ISVTX, if needed. */
|
|
if (pc.isdir ())
|
|
buf->st_mode = S_IFDIR;
|
|
else if (pc.issymlink ())
|
|
{
|
|
buf->st_size = pc.get_symlink_length ();
|
|
/* symlinks are everything for everyone! */
|
|
buf->st_mode = S_IFLNK | S_IRWXU | S_IRWXG | S_IRWXO;
|
|
get_file_attribute (h, pc, NULL,
|
|
&buf->st_uid, &buf->st_gid);
|
|
goto done;
|
|
}
|
|
else if (pc.issocket ())
|
|
buf->st_mode = S_IFSOCK;
|
|
|
|
if (!get_file_attribute (is_fs_special () && !pc.issocket () ? NULL : h, pc,
|
|
&buf->st_mode, &buf->st_uid, &buf->st_gid))
|
|
{
|
|
/* If read-only attribute is set, modify ntsec return value */
|
|
if (::has_attribute (attributes, FILE_ATTRIBUTE_READONLY)
|
|
&& !pc.isdir () && !pc.issymlink ())
|
|
buf->st_mode &= ~(S_IWUSR | S_IWGRP | S_IWOTH);
|
|
|
|
if (buf->st_mode & S_IFMT)
|
|
/* nothing */;
|
|
else if (!is_fs_special ())
|
|
buf->st_mode |= S_IFREG;
|
|
else
|
|
{
|
|
buf->st_dev = buf->st_rdev = dev ();
|
|
buf->st_mode = dev ().mode;
|
|
buf->st_size = 0;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
buf->st_mode |= STD_RBITS;
|
|
|
|
if (!::has_attribute (attributes, FILE_ATTRIBUTE_READONLY))
|
|
buf->st_mode |= STD_WBITS;
|
|
/* | S_IWGRP | S_IWOTH; we don't give write to group etc */
|
|
|
|
if (pc.isdir ())
|
|
buf->st_mode |= S_IFDIR | STD_WBITS | STD_XBITS;
|
|
else if (buf->st_mode & S_IFMT)
|
|
/* nothing */;
|
|
else if (is_fs_special ())
|
|
{
|
|
buf->st_dev = buf->st_rdev = dev ();
|
|
buf->st_mode = dev ().mode;
|
|
buf->st_size = 0;
|
|
}
|
|
else
|
|
{
|
|
buf->st_mode |= S_IFREG;
|
|
/* Check suffix for executable file. */
|
|
if (pc.exec_state () != is_executable)
|
|
{
|
|
PUNICODE_STRING path = pc.get_nt_native_path ();
|
|
|
|
if (RtlEqualUnicodePathSuffix (path, &ro_u_exe, TRUE)
|
|
|| RtlEqualUnicodePathSuffix (path, &ro_u_lnk, TRUE)
|
|
|| RtlEqualUnicodePathSuffix (path, &ro_u_com, TRUE))
|
|
pc.set_exec ();
|
|
}
|
|
/* No known suffix, check file header. This catches binaries and
|
|
shebang scripts. */
|
|
if (pc.exec_state () == dont_know_if_executable)
|
|
{
|
|
OBJECT_ATTRIBUTES attr;
|
|
NTSTATUS status = 0;
|
|
IO_STATUS_BLOCK io;
|
|
|
|
/* We have to re-open the file. Either the file is not opened
|
|
for reading, or the read will change the file position of the
|
|
original handle. */
|
|
pc.init_reopen_attr (&attr, h);
|
|
status = NtOpenFile (&h, SYNCHRONIZE | FILE_READ_DATA,
|
|
&attr, &io, FILE_SHARE_VALID_FLAGS,
|
|
FILE_OPEN_FOR_BACKUP_INTENT
|
|
| FILE_SYNCHRONOUS_IO_NONALERT);
|
|
if (!NT_SUCCESS (status))
|
|
debug_printf ("%p = NtOpenFile(%S)", status,
|
|
pc.get_nt_native_path ());
|
|
else
|
|
{
|
|
LARGE_INTEGER off = { QuadPart:0LL };
|
|
char magic[3];
|
|
|
|
status = NtReadFile (h, NULL, NULL, NULL,
|
|
&io, magic, 3, &off, NULL);
|
|
if (!NT_SUCCESS (status))
|
|
debug_printf ("%p = NtReadFile(%S)", status,
|
|
pc.get_nt_native_path ());
|
|
else if (has_exec_chars (magic, io.Information))
|
|
{
|
|
/* Heureka, it's an executable */
|
|
pc.set_exec ();
|
|
buf->st_mode |= STD_XBITS;
|
|
}
|
|
NtClose (h);
|
|
}
|
|
}
|
|
}
|
|
if (pc.exec_state () == is_executable)
|
|
buf->st_mode |= STD_XBITS;
|
|
|
|
/* This fakes the permissions of all files to match the current umask. */
|
|
buf->st_mode &= ~(cygheap->umask);
|
|
/* If the FS supports ACLs, we're here because we couldn't even open
|
|
the file for READ_CONTROL access. Chances are high that the file's
|
|
security descriptor has no ACE for "Everyone", so we should not fake
|
|
any access for "others". */
|
|
if (has_acls ())
|
|
buf->st_mode &= ~(S_IROTH | S_IWOTH | S_IXOTH);
|
|
}
|
|
|
|
done:
|
|
syscall_printf ("0 = fstat (%S, %p) st_size=%D, st_mode=%p, st_ino=%D"
|
|
"st_atim=%x.%x st_ctim=%x.%x "
|
|
"st_mtim=%x.%x st_birthtim=%x.%x",
|
|
pc.get_nt_native_path (), buf,
|
|
buf->st_size, buf->st_mode, buf->st_ino,
|
|
buf->st_atim.tv_sec, buf->st_atim.tv_nsec,
|
|
buf->st_ctim.tv_sec, buf->st_ctim.tv_nsec,
|
|
buf->st_mtim.tv_sec, buf->st_mtim.tv_nsec,
|
|
buf->st_birthtim.tv_sec, buf->st_birthtim.tv_nsec);
|
|
return 0;
|
|
}
|
|
|
|
int __stdcall
|
|
fhandler_disk_file::fstat (struct __stat64 *buf)
|
|
{
|
|
return fstat_fs (buf);
|
|
}
|
|
|
|
int __stdcall
|
|
fhandler_disk_file::fstatvfs (struct statvfs *sfs)
|
|
{
|
|
int ret = -1, opened = 0;
|
|
NTSTATUS status;
|
|
IO_STATUS_BLOCK io;
|
|
FILE_FS_FULL_SIZE_INFORMATION full_fsi;
|
|
FILE_FS_SIZE_INFORMATION fsi;
|
|
/* We must not use the stat handle here, even if it exists. The handle
|
|
has been opened with FILE_OPEN_REPARSE_POINT, thus, in case of a volume
|
|
mount point, it points to the FS of the mount point, rather than to the
|
|
mounted FS. */
|
|
HANDLE fh = get_handle ();
|
|
|
|
if (!fh)
|
|
{
|
|
OBJECT_ATTRIBUTES attr;
|
|
opened = NT_SUCCESS (NtOpenFile (&fh, READ_CONTROL,
|
|
pc.get_object_attr (attr, sec_none_nih),
|
|
&io, FILE_SHARE_VALID_FLAGS,
|
|
FILE_OPEN_FOR_BACKUP_INTENT));
|
|
if (!opened)
|
|
{
|
|
/* Can't open file. Try again with parent dir. */
|
|
UNICODE_STRING dirname;
|
|
RtlSplitUnicodePath (pc.get_nt_native_path (), &dirname, NULL);
|
|
attr.ObjectName = &dirname;
|
|
opened = NT_SUCCESS (NtOpenFile (&fh, READ_CONTROL, &attr, &io,
|
|
FILE_SHARE_VALID_FLAGS,
|
|
FILE_OPEN_FOR_BACKUP_INTENT));
|
|
if (!opened)
|
|
goto out;
|
|
}
|
|
}
|
|
|
|
sfs->f_files = ULONG_MAX;
|
|
sfs->f_ffree = ULONG_MAX;
|
|
sfs->f_favail = ULONG_MAX;
|
|
sfs->f_fsid = pc.fs_serial_number ();
|
|
sfs->f_flag = pc.fs_flags ();
|
|
sfs->f_namemax = pc.fs_name_len ();
|
|
/* Get allocation related information. Try to get "full" information
|
|
first, which is only available since W2K. If that fails, try to
|
|
retrieve normal allocation information. */
|
|
status = NtQueryVolumeInformationFile (fh, &io, &full_fsi, sizeof full_fsi,
|
|
FileFsFullSizeInformation);
|
|
if (NT_SUCCESS (status))
|
|
{
|
|
sfs->f_bsize = full_fsi.BytesPerSector * full_fsi.SectorsPerAllocationUnit;
|
|
sfs->f_frsize = sfs->f_bsize;
|
|
sfs->f_blocks = full_fsi.TotalAllocationUnits.LowPart;
|
|
sfs->f_bfree = full_fsi.ActualAvailableAllocationUnits.LowPart;
|
|
sfs->f_bavail = full_fsi.CallerAvailableAllocationUnits.LowPart;
|
|
if (sfs->f_bfree > sfs->f_bavail)
|
|
{
|
|
/* Quotas active. We can't trust TotalAllocationUnits. */
|
|
NTFS_VOLUME_DATA_BUFFER nvdb;
|
|
|
|
status = NtFsControlFile (fh, NULL, NULL, NULL, &io,
|
|
FSCTL_GET_NTFS_VOLUME_DATA,
|
|
NULL, 0, &nvdb, sizeof nvdb);
|
|
if (!NT_SUCCESS (status))
|
|
debug_printf ("%p = NtFsControlFile(%S, FSCTL_GET_NTFS_VOLUME_DATA)",
|
|
status, pc.get_nt_native_path ());
|
|
else
|
|
sfs->f_blocks = nvdb.TotalClusters.QuadPart;
|
|
}
|
|
ret = 0;
|
|
}
|
|
else
|
|
{
|
|
status = NtQueryVolumeInformationFile (fh, &io, &fsi, sizeof fsi,
|
|
FileFsSizeInformation);
|
|
if (!NT_SUCCESS (status))
|
|
{
|
|
__seterrno_from_nt_status (status);
|
|
goto out;
|
|
}
|
|
sfs->f_bsize = fsi.BytesPerSector * fsi.SectorsPerAllocationUnit;
|
|
sfs->f_frsize = sfs->f_bsize;
|
|
sfs->f_blocks = fsi.TotalAllocationUnits.LowPart;
|
|
sfs->f_bfree = fsi.AvailableAllocationUnits.LowPart;
|
|
sfs->f_bavail = sfs->f_bfree;
|
|
ret = 0;
|
|
}
|
|
out:
|
|
if (opened)
|
|
NtClose (fh);
|
|
syscall_printf ("%d = fstatvfs(%s, %p)", ret, get_name (), sfs);
|
|
return ret;
|
|
}
|
|
|
|
int __stdcall
|
|
fhandler_disk_file::fchmod (mode_t mode)
|
|
{
|
|
extern int chmod_device (path_conv& pc, mode_t mode);
|
|
int res = -1;
|
|
int oret = 0;
|
|
NTSTATUS status;
|
|
IO_STATUS_BLOCK io;
|
|
|
|
if (pc.is_fs_special ())
|
|
return chmod_device (pc, mode);
|
|
|
|
if (!get_handle ())
|
|
{
|
|
query_open (query_write_dac);
|
|
if (!(oret = open (O_BINARY, 0)))
|
|
{
|
|
/* Need WRITE_DAC|WRITE_OWNER to write ACLs. */
|
|
if (pc.has_acls ())
|
|
return -1;
|
|
/* Otherwise FILE_WRITE_ATTRIBUTES is sufficient. */
|
|
query_open (query_write_attributes);
|
|
if (!(oret = open (O_BINARY, 0)))
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
if (pc.fs_is_nfs ())
|
|
{
|
|
/* chmod on NFS shares works by writing an EA of type NfsV3Attributes.
|
|
Only type and mode have to be set. Apparently type isn't checked
|
|
for consistency, so it's sufficent to set it to NF3REG all the time. */
|
|
struct {
|
|
FILE_FULL_EA_INFORMATION ffei;
|
|
char buf[sizeof (NFS_V3_ATTR) + sizeof (fattr3)];
|
|
} ffei_buf;
|
|
ffei_buf.ffei.NextEntryOffset = 0;
|
|
ffei_buf.ffei.Flags = 0;
|
|
ffei_buf.ffei.EaNameLength = sizeof (NFS_V3_ATTR) - 1;
|
|
ffei_buf.ffei.EaValueLength = sizeof (fattr3);
|
|
strcpy (ffei_buf.ffei.EaName, NFS_V3_ATTR);
|
|
fattr3 *nfs_attr = (fattr3 *) (ffei_buf.ffei.EaName
|
|
+ ffei_buf.ffei.EaNameLength + 1);
|
|
memset (nfs_attr, 0, sizeof (fattr3));
|
|
nfs_attr->type = NF3REG;
|
|
nfs_attr->mode = mode;
|
|
status = NtSetEaFile (get_handle (), &io,
|
|
&ffei_buf.ffei, sizeof ffei_buf);
|
|
if (!NT_SUCCESS (status))
|
|
__seterrno_from_nt_status (status);
|
|
else
|
|
res = 0;
|
|
goto out;
|
|
}
|
|
|
|
if (pc.has_acls ())
|
|
{
|
|
if (pc.isdir ())
|
|
mode |= S_IFDIR;
|
|
if (!set_file_attribute (get_handle (), pc,
|
|
ILLEGAL_UID, ILLEGAL_GID, mode))
|
|
res = 0;
|
|
}
|
|
|
|
/* If the mode has any write bits set, the DOS R/O flag is in the way. */
|
|
if (mode & (S_IWUSR | S_IWGRP | S_IWOTH))
|
|
pc &= (DWORD) ~FILE_ATTRIBUTE_READONLY;
|
|
else if (!pc.has_acls ()) /* Never set DOS R/O if security is used. */
|
|
pc |= (DWORD) FILE_ATTRIBUTE_READONLY;
|
|
if (S_ISSOCK (mode))
|
|
pc |= (DWORD) FILE_ATTRIBUTE_SYSTEM;
|
|
|
|
status = NtSetAttributesFile (get_handle (), pc.file_attributes ());
|
|
/* MVFS needs a good amount of kicking to be convinced that it has to write
|
|
back metadata changes and to invalidate the cached metadata information
|
|
stored for the given handle. This method to open a second handle to
|
|
the file and write the same metadata information twice has been found
|
|
experimentally: http://cygwin.com/ml/cygwin/2009-07/msg00533.html */
|
|
if (pc.fs_is_mvfs () && NT_SUCCESS (status) && !oret)
|
|
{
|
|
OBJECT_ATTRIBUTES attr;
|
|
HANDLE fh;
|
|
|
|
pc.init_reopen_attr (&attr, get_handle ());
|
|
if (NT_SUCCESS (NtOpenFile (&fh, FILE_WRITE_ATTRIBUTES, &attr, &io,
|
|
FILE_SHARE_VALID_FLAGS,
|
|
FILE_OPEN_FOR_BACKUP_INTENT)))
|
|
{
|
|
NtSetAttributesFile (fh, pc.file_attributes ());
|
|
NtClose (fh);
|
|
}
|
|
}
|
|
/* Correct NTFS security attributes have higher priority */
|
|
if (!pc.has_acls ())
|
|
{
|
|
if (!NT_SUCCESS (status))
|
|
__seterrno_from_nt_status (status);
|
|
else
|
|
res = 0;
|
|
}
|
|
|
|
out:
|
|
if (oret)
|
|
close_fs ();
|
|
|
|
return res;
|
|
}
|
|
|
|
int __stdcall
|
|
fhandler_disk_file::fchown (__uid32_t uid, __gid32_t gid)
|
|
{
|
|
int oret = 0;
|
|
|
|
if (!pc.has_acls ())
|
|
{
|
|
/* fake - if not supported, pretend we're like win95
|
|
where it just works */
|
|
/* FIXME: Could be supported on NFS when user->uid mapping is in place. */
|
|
return 0;
|
|
}
|
|
|
|
if (!get_handle ())
|
|
{
|
|
query_open (query_write_control);
|
|
if (!(oret = fhandler_disk_file::open (O_BINARY, 0)))
|
|
return -1;
|
|
}
|
|
|
|
mode_t attrib = 0;
|
|
if (pc.isdir ())
|
|
attrib |= S_IFDIR;
|
|
__uid32_t old_uid;
|
|
int res = get_file_attribute (get_handle (), pc, &attrib, &old_uid, NULL);
|
|
if (!res)
|
|
{
|
|
/* Typical Windows default ACLs can contain permissions for one
|
|
group, while being owned by another user/group. The permission
|
|
bits returned above are pretty much useless then. Creating a
|
|
new ACL with these useless permissions results in a potentially
|
|
broken symlink. So what we do here is to set the underlying
|
|
permissions of symlinks to a sensible value which allows the
|
|
world to read the symlink and only the new owner to change it. */
|
|
if (pc.issymlink ())
|
|
attrib = S_IFLNK | STD_RBITS | STD_WBITS;
|
|
res = set_file_attribute (get_handle (), pc, uid, gid, attrib);
|
|
/* If you're running a Samba server which has no winbidd running, the
|
|
uid<->SID mapping is disfunctional. Even trying to chown to your
|
|
own account fails since the account used on the server is the UNIX
|
|
account which gets used for the standard user mapping. This is a
|
|
default mechanism which doesn't know your real Windows SID.
|
|
There are two possible error codes in different Samba releases for
|
|
this situation, one of them is unfortunately the not very significant
|
|
STATUS_ACCESS_DENIED. Instead of relying on the error codes, we're
|
|
using the below very simple heuristic. If set_file_attribute failed,
|
|
and the original user account was either already unknown, or one of
|
|
the standard UNIX accounts, we're faking success. */
|
|
if (res == -1 && pc.fs_is_samba ())
|
|
{
|
|
cygsid sid;
|
|
|
|
if (old_uid == ILLEGAL_UID
|
|
|| (sid.getfrompw (internal_getpwuid (old_uid))
|
|
&& RtlEqualPrefixSid (sid,
|
|
well_known_samba_unix_user_fake_sid)))
|
|
{
|
|
debug_printf ("Faking chown worked on standalone Samba");
|
|
res = 0;
|
|
}
|
|
}
|
|
}
|
|
if (oret)
|
|
close_fs ();
|
|
|
|
return res;
|
|
}
|
|
|
|
int _stdcall
|
|
fhandler_disk_file::facl (int cmd, int nentries, __aclent32_t *aclbufp)
|
|
{
|
|
int res = -1;
|
|
int oret = 0;
|
|
|
|
if (!pc.has_acls ())
|
|
{
|
|
cant_access_acl:
|
|
switch (cmd)
|
|
{
|
|
|
|
case SETACL:
|
|
/* Open for writing required to be able to set ctime
|
|
(even though setting the ACL is just pretended). */
|
|
if (!get_handle ())
|
|
oret = open (O_WRONLY | O_BINARY, 0);
|
|
res = 0;
|
|
break;
|
|
case GETACL:
|
|
if (!aclbufp)
|
|
set_errno (EFAULT);
|
|
else if (nentries < MIN_ACL_ENTRIES)
|
|
set_errno (ENOSPC);
|
|
else
|
|
{
|
|
struct __stat64 st;
|
|
if (!fstat (&st))
|
|
{
|
|
aclbufp[0].a_type = USER_OBJ;
|
|
aclbufp[0].a_id = st.st_uid;
|
|
aclbufp[0].a_perm = (st.st_mode & S_IRWXU) >> 6;
|
|
aclbufp[1].a_type = GROUP_OBJ;
|
|
aclbufp[1].a_id = st.st_gid;
|
|
aclbufp[1].a_perm = (st.st_mode & S_IRWXG) >> 3;
|
|
aclbufp[2].a_type = OTHER_OBJ;
|
|
aclbufp[2].a_id = ILLEGAL_GID;
|
|
aclbufp[2].a_perm = st.st_mode & S_IRWXO;
|
|
aclbufp[3].a_type = CLASS_OBJ;
|
|
aclbufp[3].a_id = ILLEGAL_GID;
|
|
aclbufp[3].a_perm = S_IRWXU | S_IRWXG | S_IRWXO;
|
|
res = MIN_ACL_ENTRIES;
|
|
}
|
|
}
|
|
break;
|
|
case GETACLCNT:
|
|
res = MIN_ACL_ENTRIES;
|
|
break;
|
|
default:
|
|
set_errno (EINVAL);
|
|
break;
|
|
}
|
|
}
|
|
else
|
|
{
|
|
if ((cmd == SETACL && !get_handle ())
|
|
|| (cmd != SETACL && !get_stat_handle ()))
|
|
{
|
|
query_open (cmd == SETACL ? query_write_control : query_read_control);
|
|
if (!(oret = open (O_BINARY, 0)))
|
|
{
|
|
if (cmd == GETACL || cmd == GETACLCNT)
|
|
goto cant_access_acl;
|
|
return -1;
|
|
}
|
|
}
|
|
switch (cmd)
|
|
{
|
|
case SETACL:
|
|
if (!aclsort32 (nentries, 0, aclbufp))
|
|
{
|
|
bool rw = false;
|
|
res = setacl (get_handle (), pc, nentries, aclbufp, rw);
|
|
if (rw)
|
|
{
|
|
IO_STATUS_BLOCK io;
|
|
FILE_BASIC_INFORMATION fbi;
|
|
fbi.CreationTime.QuadPart
|
|
= fbi.LastAccessTime.QuadPart
|
|
= fbi.LastWriteTime.QuadPart
|
|
= fbi.ChangeTime.QuadPart = 0LL;
|
|
fbi.FileAttributes = (pc.file_attributes ()
|
|
& ~FILE_ATTRIBUTE_READONLY)
|
|
?: FILE_ATTRIBUTE_NORMAL;
|
|
NtSetInformationFile (get_handle (), &io, &fbi, sizeof fbi,
|
|
FileBasicInformation);
|
|
}
|
|
}
|
|
break;
|
|
case GETACL:
|
|
if (!aclbufp)
|
|
set_errno(EFAULT);
|
|
else
|
|
res = getacl (get_stat_handle (), pc, nentries, aclbufp);
|
|
/* For this ENOSYS case, see security.cc:get_file_attribute(). */
|
|
if (res == -1 && get_errno () == ENOSYS)
|
|
goto cant_access_acl;
|
|
break;
|
|
case GETACLCNT:
|
|
res = getacl (get_stat_handle (), pc, 0, NULL);
|
|
/* Ditto. */
|
|
if (res == -1 && get_errno () == ENOSYS)
|
|
goto cant_access_acl;
|
|
break;
|
|
default:
|
|
set_errno (EINVAL);
|
|
break;
|
|
}
|
|
}
|
|
|
|
if (oret)
|
|
close_fs ();
|
|
|
|
return res;
|
|
}
|
|
|
|
ssize_t
|
|
fhandler_disk_file::fgetxattr (const char *name, void *value, size_t size)
|
|
{
|
|
if (pc.is_fs_special ())
|
|
{
|
|
set_errno (ENOTSUP);
|
|
return -1;
|
|
}
|
|
return read_ea (get_handle (), pc, name, (char *) value, size);
|
|
}
|
|
|
|
int
|
|
fhandler_disk_file::fsetxattr (const char *name, const void *value, size_t size,
|
|
int flags)
|
|
{
|
|
if (pc.is_fs_special ())
|
|
{
|
|
set_errno (ENOTSUP);
|
|
return -1;
|
|
}
|
|
return write_ea (get_handle (), pc, name, (const char *) value, size, flags);
|
|
}
|
|
|
|
int
|
|
fhandler_disk_file::fadvise (_off64_t offset, _off64_t length, int advice)
|
|
{
|
|
if (advice < POSIX_FADV_NORMAL || advice > POSIX_FADV_NOREUSE)
|
|
{
|
|
set_errno (EINVAL);
|
|
return -1;
|
|
}
|
|
|
|
/* Windows only supports advice flags for the whole file. We're using
|
|
a simplified test here so that we don't have to ask for the actual
|
|
file size. Length == 0 means all bytes starting at offset anyway.
|
|
So we only actually follow the advice, if it's given for offset == 0. */
|
|
if (offset != 0)
|
|
return 0;
|
|
|
|
/* We only support normal and sequential mode for now. Everything which
|
|
is not POSIX_FADV_SEQUENTIAL is treated like POSIX_FADV_NORMAL. */
|
|
if (advice != POSIX_FADV_SEQUENTIAL)
|
|
advice = POSIX_FADV_NORMAL;
|
|
|
|
IO_STATUS_BLOCK io;
|
|
FILE_MODE_INFORMATION fmi;
|
|
NTSTATUS status = NtQueryInformationFile (get_handle (), &io,
|
|
&fmi, sizeof fmi,
|
|
FileModeInformation);
|
|
if (!NT_SUCCESS (status))
|
|
__seterrno_from_nt_status (status);
|
|
else
|
|
{
|
|
fmi.Mode &= ~FILE_SEQUENTIAL_ONLY;
|
|
if (advice == POSIX_FADV_SEQUENTIAL)
|
|
fmi.Mode |= FILE_SEQUENTIAL_ONLY;
|
|
status = NtSetInformationFile (get_handle (), &io, &fmi, sizeof fmi,
|
|
FileModeInformation);
|
|
if (NT_SUCCESS (status))
|
|
return 0;
|
|
__seterrno_from_nt_status (status);
|
|
}
|
|
|
|
return -1;
|
|
}
|
|
|
|
int
|
|
fhandler_disk_file::ftruncate (_off64_t length, bool allow_truncate)
|
|
{
|
|
int res = -1;
|
|
|
|
if (length < 0 || !get_handle ())
|
|
set_errno (EINVAL);
|
|
else if (pc.isdir ())
|
|
set_errno (EISDIR);
|
|
else if (!(get_access () & GENERIC_WRITE))
|
|
set_errno (EBADF);
|
|
else
|
|
{
|
|
NTSTATUS status;
|
|
IO_STATUS_BLOCK io;
|
|
FILE_STANDARD_INFORMATION fsi;
|
|
FILE_END_OF_FILE_INFORMATION feofi;
|
|
|
|
status = NtQueryInformationFile (get_handle (), &io, &fsi, sizeof fsi,
|
|
FileStandardInformation);
|
|
if (!NT_SUCCESS (status))
|
|
{
|
|
__seterrno_from_nt_status (status);
|
|
return -1;
|
|
}
|
|
|
|
/* If called through posix_fallocate, silently succeed if length
|
|
is less than the file's actual length. */
|
|
if (!allow_truncate && length < fsi.EndOfFile.QuadPart)
|
|
return 0;
|
|
|
|
feofi.EndOfFile.QuadPart = length;
|
|
/* Create sparse files only when called through ftruncate, not when
|
|
called through posix_fallocate. */
|
|
if (allow_truncate
|
|
&& (pc.fs_flags () & FILE_SUPPORTS_SPARSE_FILES)
|
|
&& length >= fsi.EndOfFile.QuadPart + (128 * 1024))
|
|
{
|
|
status = NtFsControlFile (get_handle (), NULL, NULL, NULL, &io,
|
|
FSCTL_SET_SPARSE, NULL, 0, NULL, 0);
|
|
syscall_printf ("%p = NtFsControlFile(%S, FSCTL_SET_SPARSE)",
|
|
status, pc.get_nt_native_path ());
|
|
}
|
|
status = NtSetInformationFile (get_handle (), &io,
|
|
&feofi, sizeof feofi,
|
|
FileEndOfFileInformation);
|
|
if (!NT_SUCCESS (status))
|
|
__seterrno_from_nt_status (status);
|
|
else
|
|
res = 0;
|
|
}
|
|
return res;
|
|
}
|
|
|
|
int
|
|
fhandler_disk_file::link (const char *newpath)
|
|
{
|
|
size_t nlen = strlen (newpath);
|
|
path_conv newpc (newpath, PC_SYM_NOFOLLOW | PC_POSIX | PC_NULLEMPTY, stat_suffixes);
|
|
if (newpc.error)
|
|
{
|
|
set_errno (newpc.error);
|
|
return -1;
|
|
}
|
|
|
|
if (newpc.exists ())
|
|
{
|
|
syscall_printf ("file '%S' exists?", newpc.get_nt_native_path ());
|
|
set_errno (EEXIST);
|
|
return -1;
|
|
}
|
|
|
|
if (isdirsep (newpath[nlen - 1]) || has_dot_last_component (newpath, false))
|
|
{
|
|
set_errno (ENOENT);
|
|
return -1;
|
|
}
|
|
|
|
char new_buf[nlen + 5];
|
|
if (!newpc.error)
|
|
{
|
|
/* If the original file is a lnk special file (except for sockets),
|
|
and if the original file has a .lnk suffix, add one to the hardlink
|
|
as well. */
|
|
if (pc.is_lnk_special () && !pc.issocket ()
|
|
&& RtlEqualUnicodePathSuffix (pc.get_nt_native_path (),
|
|
&ro_u_lnk, TRUE))
|
|
{
|
|
/* Shortcut hack. */
|
|
stpcpy (stpcpy (new_buf, newpath), ".lnk");
|
|
newpath = new_buf;
|
|
newpc.check (newpath, PC_SYM_NOFOLLOW);
|
|
}
|
|
else if (!pc.isdir ()
|
|
&& pc.is_binary ()
|
|
&& RtlEqualUnicodePathSuffix (pc.get_nt_native_path (),
|
|
&ro_u_exe, TRUE)
|
|
&& !RtlEqualUnicodePathSuffix (newpc.get_nt_native_path (),
|
|
&ro_u_exe, TRUE))
|
|
{
|
|
/* Executable hack. */
|
|
stpcpy (stpcpy (new_buf, newpath), ".exe");
|
|
newpath = new_buf;
|
|
newpc.check (newpath, PC_SYM_NOFOLLOW);
|
|
}
|
|
}
|
|
|
|
/* We only need READ_CONTROL access so the handle returned in pc is
|
|
sufficient. And if the file couldn't be opened with READ_CONTROL
|
|
access in path_conv, we won't be able to do it here anyway. */
|
|
HANDLE fh = get_stat_handle ();
|
|
if (!fh)
|
|
{
|
|
set_errno (EACCES);
|
|
return -1;
|
|
}
|
|
PUNICODE_STRING tgt = newpc.get_nt_native_path ();
|
|
ULONG size = sizeof (FILE_LINK_INFORMATION) + tgt->Length;
|
|
PFILE_LINK_INFORMATION pfli = (PFILE_LINK_INFORMATION) alloca (size);
|
|
pfli->ReplaceIfExists = FALSE;
|
|
pfli->RootDirectory = NULL;
|
|
memcpy (pfli->FileName, tgt->Buffer, pfli->FileNameLength = tgt->Length);
|
|
|
|
NTSTATUS status;
|
|
IO_STATUS_BLOCK io;
|
|
status = NtSetInformationFile (fh, &io, pfli, size, FileLinkInformation);
|
|
if (!NT_SUCCESS (status))
|
|
{
|
|
if (status == STATUS_INVALID_DEVICE_REQUEST
|
|
|| status == STATUS_NOT_SUPPORTED)
|
|
{
|
|
/* FS doesn't support hard links. Linux returns EPERM. */
|
|
set_errno (EPERM);
|
|
return -1;
|
|
}
|
|
else
|
|
{
|
|
__seterrno_from_nt_status (status);
|
|
return -1;
|
|
}
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
fhandler_disk_file::utimens (const struct timespec *tvp)
|
|
{
|
|
return utimens_fs (tvp);
|
|
}
|
|
|
|
int
|
|
fhandler_base::utimens_fs (const struct timespec *tvp)
|
|
{
|
|
struct timespec timeofday;
|
|
struct timespec tmp[2];
|
|
bool closeit = false;
|
|
|
|
if (!get_handle ())
|
|
{
|
|
query_open (query_write_attributes);
|
|
if (!open_fs (O_BINARY, 0))
|
|
{
|
|
/* It's documented in MSDN that FILE_WRITE_ATTRIBUTES is sufficient
|
|
to change the timestamps. Unfortunately it's not sufficient for a
|
|
remote HPFS which requires GENERIC_WRITE, so we just retry to open
|
|
for writing, though this fails for R/O files of course. */
|
|
query_open (no_query);
|
|
if (!open_fs (O_WRONLY | O_BINARY, 0))
|
|
{
|
|
syscall_printf ("Opening file failed");
|
|
return -1;
|
|
}
|
|
}
|
|
closeit = true;
|
|
}
|
|
|
|
clock_gettime (CLOCK_REALTIME, &timeofday);
|
|
if (!tvp)
|
|
tmp[1] = tmp[0] = timeofday;
|
|
else
|
|
{
|
|
if ((tvp[0].tv_nsec < UTIME_NOW || tvp[0].tv_nsec > 999999999L)
|
|
|| (tvp[1].tv_nsec < UTIME_NOW || tvp[1].tv_nsec > 999999999L))
|
|
{
|
|
if (closeit)
|
|
close_fs ();
|
|
set_errno (EINVAL);
|
|
return -1;
|
|
}
|
|
tmp[0] = (tvp[0].tv_nsec == UTIME_NOW) ? timeofday : tvp[0];
|
|
tmp[1] = (tvp[1].tv_nsec == UTIME_NOW) ? timeofday : tvp[1];
|
|
}
|
|
debug_printf ("incoming lastaccess %08x %08x", tmp[0].tv_sec, tmp[0].tv_nsec);
|
|
|
|
IO_STATUS_BLOCK io;
|
|
FILE_BASIC_INFORMATION fbi;
|
|
|
|
fbi.CreationTime.QuadPart = 0LL;
|
|
/* UTIME_OMIT is handled in timespec_to_filetime by setting FILETIME to 0. */
|
|
timespec_to_filetime (&tmp[0], (LPFILETIME) &fbi.LastAccessTime);
|
|
timespec_to_filetime (&tmp[1], (LPFILETIME) &fbi.LastWriteTime);
|
|
fbi.ChangeTime.QuadPart = 0LL;
|
|
fbi.FileAttributes = 0;
|
|
NTSTATUS status = NtSetInformationFile (get_handle (), &io, &fbi, sizeof fbi,
|
|
FileBasicInformation);
|
|
/* For this special case for MVFS see the comment in
|
|
fhandler_disk_file::fchmod. */
|
|
if (pc.fs_is_mvfs () && NT_SUCCESS (status) && !closeit)
|
|
{
|
|
OBJECT_ATTRIBUTES attr;
|
|
HANDLE fh;
|
|
|
|
pc.init_reopen_attr (&attr, get_handle ());
|
|
if (NT_SUCCESS (NtOpenFile (&fh, FILE_WRITE_ATTRIBUTES, &attr, &io,
|
|
FILE_SHARE_VALID_FLAGS,
|
|
FILE_OPEN_FOR_BACKUP_INTENT)))
|
|
{
|
|
NtSetInformationFile (fh, &io, &fbi, sizeof fbi,
|
|
FileBasicInformation);
|
|
NtClose (fh);
|
|
}
|
|
}
|
|
if (closeit)
|
|
close_fs ();
|
|
/* Opening a directory on a 9x share from a NT machine works(!), but
|
|
then NtSetInformationFile fails with STATUS_NOT_SUPPORTED. Oh well... */
|
|
if (!NT_SUCCESS (status) && status != STATUS_NOT_SUPPORTED)
|
|
{
|
|
__seterrno_from_nt_status (status);
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
fhandler_disk_file::fhandler_disk_file () :
|
|
fhandler_base (), prw_handle (NULL)
|
|
{
|
|
}
|
|
|
|
fhandler_disk_file::fhandler_disk_file (path_conv &pc) :
|
|
fhandler_base (), prw_handle (NULL)
|
|
{
|
|
set_name (pc);
|
|
}
|
|
|
|
int
|
|
fhandler_disk_file::open (int flags, mode_t mode)
|
|
{
|
|
return open_fs (flags, mode);
|
|
}
|
|
|
|
int
|
|
fhandler_disk_file::close ()
|
|
{
|
|
/* Close extra pread/pwrite handle, if it exists. */
|
|
if (prw_handle)
|
|
NtClose (prw_handle);
|
|
/* Delete all POSIX locks on the file. Delete all flock locks on the
|
|
file if this is the last reference to this file. */
|
|
del_my_locks (on_close);
|
|
return fhandler_base::close ();
|
|
}
|
|
|
|
int
|
|
fhandler_disk_file::dup (fhandler_base *child, int flags)
|
|
{
|
|
fhandler_disk_file *fhc = (fhandler_disk_file *) child;
|
|
|
|
int ret = fhandler_base::dup (child, flags);
|
|
if (!ret && prw_handle
|
|
&& !DuplicateHandle (GetCurrentProcess (), prw_handle,
|
|
GetCurrentProcess (), &fhc->prw_handle,
|
|
0, TRUE, DUPLICATE_SAME_ACCESS))
|
|
prw_handle = NULL;
|
|
return ret;
|
|
}
|
|
|
|
void
|
|
fhandler_disk_file::fixup_after_fork (HANDLE parent)
|
|
{
|
|
prw_handle = NULL;
|
|
fhandler_base::fixup_after_fork (parent);
|
|
}
|
|
|
|
int
|
|
fhandler_base::open_fs (int flags, mode_t mode)
|
|
{
|
|
/* Unfortunately NT allows to open directories for writing, but that's
|
|
disallowed according to SUSv3. */
|
|
if (pc.isdir () && (flags & O_ACCMODE) != O_RDONLY)
|
|
{
|
|
set_errno (EISDIR);
|
|
return 0;
|
|
}
|
|
|
|
int res = fhandler_base::open (flags | O_DIROPEN, mode);
|
|
if (!res)
|
|
goto out;
|
|
|
|
/* This is for file systems known for having a buggy CreateFile call
|
|
which might return a valid HANDLE without having actually opened
|
|
the file.
|
|
The only known file system to date is the SUN NFS Solstice Client 3.1
|
|
which returns a valid handle when trying to open a file in a nonexistent
|
|
directory. */
|
|
if (pc.has_buggy_open () && !pc.exists ())
|
|
{
|
|
debug_printf ("Buggy open detected.");
|
|
close_fs ();
|
|
set_errno (ENOENT);
|
|
return 0;
|
|
}
|
|
|
|
ino = pc.get_ino_by_handle (get_handle ());
|
|
/* A unique ID is necessary to recognize fhandler entries which are
|
|
duplicated by dup(2) or fork(2). */
|
|
NtAllocateLocallyUniqueId ((PLUID) &unique_id);
|
|
|
|
out:
|
|
syscall_printf ("%d = fhandler_disk_file::open(%S, %p)", res,
|
|
pc.get_nt_native_path (), flags);
|
|
return res;
|
|
}
|
|
|
|
/* POSIX demands that pread/pwrite don't change the current file position.
|
|
While NtReadFile/NtWriteFile support atomic seek-and-io, both change the
|
|
file pointer if the file handle has been opened for synchonous I/O.
|
|
Using this handle for pread/pwrite would break atomicity, because the
|
|
read/write operation would have to be followed by a seek back to the old
|
|
file position. What we do is to open another handle to the file on the
|
|
first call to either pread or pwrite. This is used for any subsequent
|
|
pread/pwrite. Thus the current file position of the "normal" file
|
|
handle is not touched.
|
|
|
|
FIXME:
|
|
|
|
Note that this is just a hack. The problem with this approach is that
|
|
a change to the file permissions might disallow to open the file with
|
|
the required permissions to read or write. This appears to be a border case,
|
|
but that's exactly what git does. It creates the file for reading and
|
|
writing and after writing it, it chmods the file to read-only. Then it
|
|
calls pread on the file to examine the content. This works, but if git
|
|
would use the original handle to pwrite to the file, it would be broken
|
|
with our approach.
|
|
|
|
One way to implement this is to open the pread/pwrite handle right at
|
|
file open time. We would simply maintain two handles, which wouldn't
|
|
be much of a problem given how we do that for other fhandler types as
|
|
well.
|
|
|
|
However, ultimately fhandler_disk_file should become a derived class of
|
|
fhandler_base_overlapped. Each raw_read or raw_write would fetch the
|
|
actual file position, read/write from there, and then set the file
|
|
position again. Fortunately, while the file position is not maintained
|
|
by the I/O manager, it can be fetched and set to a new value by all
|
|
processes holding a handle to that file object. Pread and pwrite differ
|
|
from raw_read and raw_write just by not touching the current file pos.
|
|
Actually they could be merged with raw_read/raw_write if we add a position
|
|
parameter to the latter. */
|
|
|
|
int
|
|
fhandler_disk_file::prw_open (bool write)
|
|
{
|
|
NTSTATUS status;
|
|
IO_STATUS_BLOCK io;
|
|
OBJECT_ATTRIBUTES attr;
|
|
|
|
/* First try to open with the original access mask */
|
|
ACCESS_MASK access = get_access ();
|
|
pc.init_reopen_attr (&attr, get_handle ());
|
|
status = NtOpenFile (&prw_handle, access, &attr, &io,
|
|
FILE_SHARE_VALID_FLAGS, get_options ());
|
|
if (status == STATUS_ACCESS_DENIED)
|
|
{
|
|
/* If we get an access denied, chmod has been called. Try again
|
|
with just the required rights to perform the called function. */
|
|
access &= write ? ~GENERIC_READ : ~GENERIC_WRITE;
|
|
status = NtOpenFile (&prw_handle, access, &attr, &io,
|
|
FILE_SHARE_VALID_FLAGS, get_options ());
|
|
}
|
|
debug_printf ("%x = NtOpenFile (%p, %x, %S, io, %x, %x)",
|
|
status, prw_handle, access, pc.get_nt_native_path (),
|
|
FILE_SHARE_VALID_FLAGS, get_options ());
|
|
if (!NT_SUCCESS (status))
|
|
{
|
|
__seterrno_from_nt_status (status);
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
ssize_t __stdcall
|
|
fhandler_disk_file::pread (void *buf, size_t count, _off64_t offset)
|
|
{
|
|
if ((get_flags () & O_ACCMODE) == O_WRONLY)
|
|
{
|
|
set_errno (EBADF);
|
|
return -1;
|
|
}
|
|
|
|
/* In binary mode, we can use an atomic NtReadFile call. */
|
|
if (rbinary ())
|
|
{
|
|
extern int __stdcall is_at_eof (HANDLE h);
|
|
NTSTATUS status;
|
|
IO_STATUS_BLOCK io;
|
|
LARGE_INTEGER off = { QuadPart:offset };
|
|
|
|
if (!prw_handle && prw_open (false))
|
|
goto non_atomic;
|
|
status = NtReadFile (prw_handle, NULL, NULL, NULL, &io, buf, count,
|
|
&off, NULL);
|
|
if (!NT_SUCCESS (status))
|
|
{
|
|
if (pc.isdir ())
|
|
{
|
|
set_errno (EISDIR);
|
|
return -1;
|
|
}
|
|
if (status == (NTSTATUS) STATUS_ACCESS_VIOLATION)
|
|
{
|
|
if (is_at_eof (prw_handle))
|
|
return 0;
|
|
switch (mmap_is_attached_or_noreserve (buf, count))
|
|
{
|
|
case MMAP_NORESERVE_COMMITED:
|
|
status = NtReadFile (prw_handle, NULL, NULL, NULL, &io,
|
|
buf, count, &off, NULL);
|
|
if (NT_SUCCESS (status))
|
|
return io.Information;
|
|
break;
|
|
case MMAP_RAISE_SIGBUS:
|
|
raise (SIGBUS);
|
|
default:
|
|
break;
|
|
}
|
|
}
|
|
__seterrno_from_nt_status (status);
|
|
return -1;
|
|
}
|
|
}
|
|
|
|
non_atomic:
|
|
/* Text mode stays slow and non-atomic. */
|
|
ssize_t res;
|
|
_off64_t curpos = lseek (0, SEEK_CUR);
|
|
if (curpos < 0 || lseek (offset, SEEK_SET) < 0)
|
|
res = -1;
|
|
else
|
|
{
|
|
size_t tmp_count = count;
|
|
read (buf, tmp_count);
|
|
if (lseek (curpos, SEEK_SET) >= 0)
|
|
res = (ssize_t) tmp_count;
|
|
else
|
|
res = -1;
|
|
}
|
|
debug_printf ("%d = pread(%p, %d, %d)\n", res, buf, count, offset);
|
|
return res;
|
|
}
|
|
|
|
ssize_t __stdcall
|
|
fhandler_disk_file::pwrite (void *buf, size_t count, _off64_t offset)
|
|
{
|
|
if ((get_flags () & O_ACCMODE) == O_RDONLY)
|
|
{
|
|
set_errno (EBADF);
|
|
return -1;
|
|
}
|
|
|
|
/* In binary mode, we can use an atomic NtWriteFile call. */
|
|
if (wbinary ())
|
|
{
|
|
NTSTATUS status;
|
|
IO_STATUS_BLOCK io;
|
|
LARGE_INTEGER off = { QuadPart:offset };
|
|
|
|
if (!prw_handle && prw_open (true))
|
|
goto non_atomic;
|
|
status = NtWriteFile (prw_handle, NULL, NULL, NULL, &io, buf, count,
|
|
&off, NULL);
|
|
if (!NT_SUCCESS (status))
|
|
{
|
|
__seterrno_from_nt_status (status);
|
|
return -1;
|
|
}
|
|
return io.Information;
|
|
}
|
|
|
|
non_atomic:
|
|
/* Text mode stays slow and non-atomic. */
|
|
int res;
|
|
_off64_t curpos = lseek (0, SEEK_CUR);
|
|
if (curpos < 0 || lseek (offset, SEEK_SET) < 0)
|
|
res = curpos;
|
|
else
|
|
{
|
|
res = (ssize_t) write (buf, count);
|
|
if (lseek (curpos, SEEK_SET) < 0)
|
|
res = -1;
|
|
}
|
|
debug_printf ("%d = pwrite(%p, %d, %d)\n", res, buf, count, offset);
|
|
return res;
|
|
}
|
|
|
|
int
|
|
fhandler_disk_file::mkdir (mode_t mode)
|
|
{
|
|
int res = -1;
|
|
SECURITY_ATTRIBUTES sa = sec_none_nih;
|
|
NTSTATUS status;
|
|
HANDLE dir;
|
|
OBJECT_ATTRIBUTES attr;
|
|
IO_STATUS_BLOCK io;
|
|
PFILE_FULL_EA_INFORMATION p = NULL;
|
|
ULONG plen = 0;
|
|
ULONG access = FILE_LIST_DIRECTORY | SYNCHRONIZE;
|
|
|
|
if (pc.fs_is_nfs ())
|
|
{
|
|
/* When creating a dir on an NFS share, we have to set the
|
|
file mode by writing a NFS fattr3 structure with the
|
|
correct mode bits set. */
|
|
plen = sizeof (FILE_FULL_EA_INFORMATION) + sizeof (NFS_V3_ATTR)
|
|
+ sizeof (fattr3);
|
|
p = (PFILE_FULL_EA_INFORMATION) alloca (plen);
|
|
p->NextEntryOffset = 0;
|
|
p->Flags = 0;
|
|
p->EaNameLength = sizeof (NFS_V3_ATTR) - 1;
|
|
p->EaValueLength = sizeof (fattr3);
|
|
strcpy (p->EaName, NFS_V3_ATTR);
|
|
fattr3 *nfs_attr = (fattr3 *) (p->EaName + p->EaNameLength + 1);
|
|
memset (nfs_attr, 0, sizeof (fattr3));
|
|
nfs_attr->type = NF3DIR;
|
|
nfs_attr->mode = (mode & 07777) & ~cygheap->umask;
|
|
}
|
|
else if (has_acls () && !isremote ())
|
|
/* If the filesystem supports ACLs, we will overwrite the DACL after the
|
|
call to NtCreateFile. This requires a handle with READ_CONTROL and
|
|
WRITE_DAC access, otherwise get_file_sd and set_file_sd both have to
|
|
open the file again.
|
|
FIXME: On remote NTFS shares open sometimes fails because even the
|
|
creator of the file doesn't have the right to change the DACL.
|
|
I don't know what setting that is or how to recognize such a share,
|
|
so for now we don't request WRITE_DAC on remote drives. */
|
|
access |= READ_CONTROL | WRITE_DAC;
|
|
status = NtCreateFile (&dir, access, pc.get_object_attr (attr, sa), &io, NULL,
|
|
FILE_ATTRIBUTE_DIRECTORY, FILE_SHARE_VALID_FLAGS,
|
|
FILE_CREATE,
|
|
FILE_DIRECTORY_FILE | FILE_SYNCHRONOUS_IO_NONALERT
|
|
| FILE_OPEN_FOR_BACKUP_INTENT,
|
|
p, plen);
|
|
if (NT_SUCCESS (status))
|
|
{
|
|
if (has_acls ())
|
|
set_file_attribute (dir, pc, ILLEGAL_UID, ILLEGAL_GID,
|
|
S_JUSTCREATED | S_IFDIR
|
|
| ((mode & 07777) & ~cygheap->umask));
|
|
NtClose (dir);
|
|
res = 0;
|
|
}
|
|
else
|
|
__seterrno_from_nt_status (status);
|
|
|
|
return res;
|
|
}
|
|
|
|
int
|
|
fhandler_disk_file::rmdir ()
|
|
{
|
|
extern NTSTATUS unlink_nt (path_conv &pc);
|
|
|
|
if (!pc.isdir ())
|
|
{
|
|
set_errno (ENOTDIR);
|
|
return -1;
|
|
}
|
|
if (!pc.exists ())
|
|
{
|
|
set_errno (ENOENT);
|
|
return -1;
|
|
}
|
|
|
|
NTSTATUS status = unlink_nt (pc);
|
|
|
|
/* Check for existence of remote dirs after trying to delete them.
|
|
Two reasons:
|
|
- Sometimes SMB indicates failure when it really succeeds.
|
|
- Removing a directory on a Samba drive using an old Samba version
|
|
sometimes doesn't return an error, if the directory can't be removed
|
|
because it's not empty. */
|
|
if (isremote ())
|
|
{
|
|
OBJECT_ATTRIBUTES attr;
|
|
FILE_BASIC_INFORMATION fbi;
|
|
NTSTATUS q_status;
|
|
|
|
q_status = NtQueryAttributesFile (pc.get_object_attr (attr, sec_none_nih),
|
|
&fbi);
|
|
if (!NT_SUCCESS (status) && q_status == STATUS_OBJECT_NAME_NOT_FOUND)
|
|
status = STATUS_SUCCESS;
|
|
else if (pc.fs_is_samba ()
|
|
&& NT_SUCCESS (status) && NT_SUCCESS (q_status))
|
|
status = STATUS_DIRECTORY_NOT_EMPTY;
|
|
}
|
|
if (!NT_SUCCESS (status))
|
|
{
|
|
__seterrno_from_nt_status (status);
|
|
return -1;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
/* This is the minimal number of entries which fit into the readdir cache.
|
|
The number of bytes allocated by the cache is determined by this number,
|
|
To tune caching, just tweak this number. To get a feeling for the size,
|
|
the size of the readdir cache is DIR_NUM_ENTRIES * 624 + 4 bytes. */
|
|
|
|
#define DIR_NUM_ENTRIES 100 /* Cache size 62404 bytes */
|
|
|
|
#define DIR_BUF_SIZE (DIR_NUM_ENTRIES \
|
|
* (sizeof (FILE_ID_BOTH_DIR_INFORMATION) \
|
|
+ (NAME_MAX + 1) * sizeof (WCHAR)))
|
|
|
|
struct __DIR_cache
|
|
{
|
|
char __cache[DIR_BUF_SIZE]; /* W2K needs this buffer 8 byte aligned. */
|
|
ULONG __pos;
|
|
};
|
|
|
|
#define d_cachepos(d) (((__DIR_cache *) (d)->__d_dirname)->__pos)
|
|
#define d_cache(d) (((__DIR_cache *) (d)->__d_dirname)->__cache)
|
|
|
|
#define d_mounts(d) ((__DIR_mounts *) (d)->__d_internal)
|
|
|
|
DIR *
|
|
fhandler_disk_file::opendir (int fd)
|
|
{
|
|
DIR *dir;
|
|
DIR *res = NULL;
|
|
|
|
if (!pc.isdir ())
|
|
set_errno (ENOTDIR);
|
|
else if ((dir = (DIR *) malloc (sizeof (DIR))) == NULL)
|
|
set_errno (ENOMEM);
|
|
else if ((dir->__d_dirname = (char *) malloc ( sizeof (struct __DIR_cache)))
|
|
== NULL)
|
|
{
|
|
set_errno (ENOMEM);
|
|
goto free_dir;
|
|
}
|
|
else if ((dir->__d_dirent =
|
|
(struct dirent *) malloc (sizeof (struct dirent))) == NULL)
|
|
{
|
|
set_errno (ENOMEM);
|
|
goto free_dirname;
|
|
}
|
|
else
|
|
{
|
|
cygheap_fdnew cfd;
|
|
if (cfd < 0 && fd < 0)
|
|
goto free_dirent;
|
|
|
|
dir->__d_dirent->__d_version = __DIRENT_VERSION;
|
|
dir->__d_cookie = __DIRENT_COOKIE;
|
|
dir->__handle = INVALID_HANDLE_VALUE;
|
|
dir->__d_position = 0;
|
|
dir->__flags = (get_name ()[0] == '/' && get_name ()[1] == '\0')
|
|
? dirent_isroot : 0;
|
|
dir->__d_internal = (unsigned) new __DIR_mounts (get_name ());
|
|
d_cachepos (dir) = 0;
|
|
|
|
if (!pc.iscygdrive ())
|
|
{
|
|
if (fd < 0)
|
|
{
|
|
/* opendir() case. Initialize with given directory name and
|
|
NULL directory handle. */
|
|
OBJECT_ATTRIBUTES attr;
|
|
NTSTATUS status;
|
|
IO_STATUS_BLOCK io;
|
|
/* Tools like ls(1) call dirfd() to fetch the directory
|
|
descriptor for calls to facl or fstat. The tight access mask
|
|
used so far is not sufficient to reuse the handle for these
|
|
calls, instead the facl/fstat calls find the handle to be
|
|
unusable and have to re-open the file for reading attributes
|
|
and control data. So, what we do here is to try to open the
|
|
directory with more relaxed access mask which enables to use
|
|
the handle for the aforementioned purpose. This should work
|
|
in almost all cases. Only if it doesn't work due to
|
|
permission problems, we drop the additional access bits and
|
|
try again. */
|
|
ACCESS_MASK fstat_mask = READ_CONTROL | FILE_READ_ATTRIBUTES;
|
|
|
|
do
|
|
{
|
|
status = NtOpenFile (&get_handle (),
|
|
SYNCHRONIZE | FILE_LIST_DIRECTORY
|
|
| fstat_mask,
|
|
pc.get_object_attr (attr, sec_none_nih),
|
|
&io, FILE_SHARE_VALID_FLAGS,
|
|
FILE_SYNCHRONOUS_IO_NONALERT
|
|
| FILE_OPEN_FOR_BACKUP_INTENT
|
|
| FILE_DIRECTORY_FILE);
|
|
if (!NT_SUCCESS (status))
|
|
{
|
|
if (status == STATUS_ACCESS_DENIED && fstat_mask)
|
|
fstat_mask = 0;
|
|
else
|
|
{
|
|
__seterrno_from_nt_status (status);
|
|
goto free_mounts;
|
|
}
|
|
}
|
|
}
|
|
while (!NT_SUCCESS (status));
|
|
}
|
|
|
|
/* FileIdBothDirectoryInformation is apparently unsupported on
|
|
XP when accessing directories on UDF. When trying to use it
|
|
so, NtQueryDirectoryFile returns with STATUS_ACCESS_VIOLATION.
|
|
It's not clear if the call isn't also unsupported on other
|
|
OS/FS combinations (say, Win2K/CDFS or so). Instead of
|
|
testing in readdir for yet another error code, let's use
|
|
FileIdBothDirectoryInformation only on filesystems supporting
|
|
persistent ACLs, FileBothDirectoryInformation otherwise.
|
|
|
|
NFS clients hide dangling symlinks from directory queries,
|
|
unless you use the FileNamesInformation info class.
|
|
On newer NFS clients (>=Vista) FileIdBothDirectoryInformation
|
|
works fine, but only if the NFS share is mounted to a drive
|
|
letter. TODO: We don't test that here for now, but it might
|
|
be worth to test if there's a speed gain in using
|
|
FileIdBothDirectoryInformation, because it doesn't require to
|
|
open the file to read the inode number. */
|
|
if (pc.hasgood_inode ())
|
|
{
|
|
dir->__flags |= dirent_set_d_ino;
|
|
if (pc.fs_is_nfs ())
|
|
dir->__flags |= dirent_nfs_d_ino;
|
|
else if (!pc.has_buggy_fileid_dirinfo ())
|
|
dir->__flags |= dirent_get_d_ino;
|
|
}
|
|
}
|
|
if (fd >= 0)
|
|
dir->__d_fd = fd;
|
|
else
|
|
{
|
|
/* Filling cfd with `this' (aka storing this in the file
|
|
descriptor table should only happen after it's clear that
|
|
opendir doesn't fail, otherwise we end up cfree'ing the
|
|
fhandler twice, once in opendir() in dir.cc, the second
|
|
time on exit. Nasty, nasty... */
|
|
cfd = this;
|
|
dir->__d_fd = cfd;
|
|
if (pc.iscygdrive ())
|
|
cfd->nohandle (true);
|
|
}
|
|
set_close_on_exec (true);
|
|
dir->__fh = this;
|
|
res = dir;
|
|
}
|
|
|
|
syscall_printf ("%p = opendir (%s)", res, get_name ());
|
|
return res;
|
|
|
|
free_mounts:
|
|
delete d_mounts (dir);
|
|
free_dirent:
|
|
free (dir->__d_dirent);
|
|
free_dirname:
|
|
free (dir->__d_dirname);
|
|
free_dir:
|
|
free (dir);
|
|
return res;
|
|
}
|
|
|
|
__ino64_t __stdcall
|
|
readdir_get_ino (const char *path, bool dot_dot)
|
|
{
|
|
char *fname;
|
|
struct __stat64 st;
|
|
HANDLE hdl;
|
|
OBJECT_ATTRIBUTES attr;
|
|
IO_STATUS_BLOCK io;
|
|
__ino64_t ino = 0;
|
|
|
|
if (dot_dot)
|
|
{
|
|
fname = (char *) alloca (strlen (path) + 4);
|
|
char *c = stpcpy (fname, path);
|
|
if (c[-1] != '/')
|
|
*c++ = '/';
|
|
strcpy (c, "..");
|
|
path = fname;
|
|
}
|
|
path_conv pc (path, PC_SYM_NOFOLLOW | PC_POSIX | PC_NOWARN | PC_KEEP_HANDLE);
|
|
if (pc.isspecial ())
|
|
{
|
|
if (!stat_worker (pc, &st))
|
|
ino = st.st_ino;
|
|
}
|
|
else if (!pc.hasgood_inode ())
|
|
ino = hash_path_name (0, pc.get_nt_native_path ());
|
|
else if ((hdl = pc.handle ()) != NULL
|
|
|| NT_SUCCESS (NtOpenFile (&hdl, READ_CONTROL,
|
|
pc.get_object_attr (attr, sec_none_nih),
|
|
&io, FILE_SHARE_VALID_FLAGS,
|
|
FILE_OPEN_FOR_BACKUP_INTENT
|
|
| (pc.is_rep_symlink ()
|
|
? FILE_OPEN_REPARSE_POINT : 0)))
|
|
)
|
|
{
|
|
ino = pc.get_ino_by_handle (hdl);
|
|
if (!ino)
|
|
ino = hash_path_name (0, pc.get_nt_native_path ());
|
|
}
|
|
return ino;
|
|
}
|
|
|
|
int
|
|
fhandler_disk_file::readdir_helper (DIR *dir, dirent *de, DWORD w32_err,
|
|
DWORD attr, PUNICODE_STRING fname)
|
|
{
|
|
if (w32_err)
|
|
{
|
|
bool added = false;
|
|
if ((de->d_ino = d_mounts (dir)->check_missing_mount (fname)))
|
|
added = true;
|
|
if (!added)
|
|
{
|
|
fname->Length = 0;
|
|
return geterrno_from_win_error (w32_err);
|
|
}
|
|
|
|
attr = 0;
|
|
dir->__flags &= ~dirent_set_d_ino;
|
|
}
|
|
|
|
/* Set d_type if type can be determined from file attributes. For .lnk
|
|
symlinks, d_type will be reset below. Reparse points can be NTFS
|
|
symlinks, even if they have the FILE_ATTRIBUTE_DIRECTORY flag set. */
|
|
if (attr &&
|
|
!(attr & (~FILE_ATTRIBUTE_VALID_FLAGS | FILE_ATTRIBUTE_REPARSE_POINT)))
|
|
{
|
|
if (attr & FILE_ATTRIBUTE_DIRECTORY)
|
|
de->d_type = DT_DIR;
|
|
/* FILE_ATTRIBUTE_SYSTEM might denote system-bit type symlinks. */
|
|
else if (!(attr & FILE_ATTRIBUTE_SYSTEM))
|
|
de->d_type = DT_REG;
|
|
}
|
|
|
|
/* Check for directory reparse point. These are potential volume mount
|
|
points which have another inode than the underlying directory. */
|
|
if ((attr & (FILE_ATTRIBUTE_DIRECTORY | FILE_ATTRIBUTE_REPARSE_POINT))
|
|
== (FILE_ATTRIBUTE_DIRECTORY | FILE_ATTRIBUTE_REPARSE_POINT))
|
|
{
|
|
HANDLE reph;
|
|
OBJECT_ATTRIBUTES attr;
|
|
IO_STATUS_BLOCK io;
|
|
|
|
InitializeObjectAttributes (&attr, fname, pc.objcaseinsensitive (),
|
|
get_handle (), NULL);
|
|
de->d_type = readdir_check_reparse_point (&attr);
|
|
if (de->d_type == DT_DIR)
|
|
{
|
|
/* Volume mountpoints are treated as directories. We have to fix
|
|
the inode number, otherwise we have the inode number of the
|
|
mount point, rather than the inode number of the toplevel
|
|
directory of the mounted drive. */
|
|
if (NT_SUCCESS (NtOpenFile (&reph, READ_CONTROL, &attr, &io,
|
|
FILE_SHARE_VALID_FLAGS,
|
|
FILE_OPEN_FOR_BACKUP_INTENT)))
|
|
{
|
|
de->d_ino = pc.get_ino_by_handle (reph);
|
|
NtClose (reph);
|
|
}
|
|
}
|
|
}
|
|
|
|
/* Check for Windows shortcut. If it's a Cygwin or U/WIN symlink, drop the
|
|
.lnk suffix and set d_type accordingly. */
|
|
if ((attr & (FILE_ATTRIBUTE_DIRECTORY
|
|
| FILE_ATTRIBUTE_REPARSE_POINT
|
|
| FILE_ATTRIBUTE_READONLY)) == FILE_ATTRIBUTE_READONLY
|
|
&& fname->Length > 4 * sizeof (WCHAR))
|
|
{
|
|
UNICODE_STRING uname;
|
|
|
|
RtlInitCountedUnicodeString (&uname,
|
|
fname->Buffer
|
|
+ fname->Length / sizeof (WCHAR) - 4,
|
|
4 * sizeof (WCHAR));
|
|
if (RtlEqualUnicodeString (&uname, &ro_u_lnk, TRUE))
|
|
{
|
|
tmp_pathbuf tp;
|
|
char *file = tp.c_get ();
|
|
char *p = stpcpy (file, pc.normalized_path);
|
|
if (p[-1] != '/')
|
|
*p++ = '/';
|
|
sys_wcstombs (p, NT_MAX_PATH - (p - file),
|
|
fname->Buffer, fname->Length / sizeof (WCHAR));
|
|
path_conv fpath (file, PC_SYM_NOFOLLOW);
|
|
if (fpath.issymlink ())
|
|
{
|
|
fname->Length -= 4 * sizeof (WCHAR);
|
|
de->d_type = DT_LNK;
|
|
}
|
|
else if (fpath.isfifo ())
|
|
{
|
|
fname->Length -= 4 * sizeof (WCHAR);
|
|
de->d_type = DT_FIFO;
|
|
}
|
|
else if (fpath.is_fs_special ())
|
|
{
|
|
fname->Length -= 4 * sizeof (WCHAR);
|
|
de->d_type = S_ISCHR (fpath.dev.mode) ? DT_CHR : DT_BLK;
|
|
}
|
|
}
|
|
}
|
|
|
|
sys_wcstombs (de->d_name, NAME_MAX + 1, fname->Buffer,
|
|
fname->Length / sizeof (WCHAR));
|
|
|
|
/* Don't try to optimize relative to dir->__d_position. On several
|
|
filesystems it's no safe bet that "." and ".." entries always
|
|
come first. */
|
|
if (de->d_name[0] == '.')
|
|
{
|
|
if (de->d_name[1] == '\0')
|
|
dir->__flags |= dirent_saw_dot;
|
|
else if (de->d_name[1] == '.' && de->d_name[2] == '\0')
|
|
dir->__flags |= dirent_saw_dot_dot;
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
int
|
|
fhandler_disk_file::readdir (DIR *dir, dirent *de)
|
|
{
|
|
int res = 0;
|
|
NTSTATUS status = STATUS_SUCCESS;
|
|
PFILE_ID_BOTH_DIR_INFORMATION buf = NULL;
|
|
PWCHAR FileName;
|
|
ULONG FileNameLength;
|
|
ULONG FileAttributes = 0;
|
|
IO_STATUS_BLOCK io;
|
|
UNICODE_STRING fname;
|
|
|
|
/* d_cachepos always refers to the next cache entry to use. If it's 0
|
|
we must reload the cache. */
|
|
if (d_cachepos (dir) == 0)
|
|
{
|
|
if ((dir->__flags & dirent_get_d_ino))
|
|
{
|
|
status = NtQueryDirectoryFile (get_handle (), NULL, NULL, NULL, &io,
|
|
d_cache (dir), DIR_BUF_SIZE,
|
|
FileIdBothDirectoryInformation,
|
|
FALSE, NULL, dir->__d_position == 0);
|
|
/* FileIdBothDirectoryInformation isn't supported for remote drives
|
|
on NT4 and 2K systems, and it's also not supported on 2K at all,
|
|
when accessing network drives on any remote OS. There are also
|
|
hacked versions of Samba 3.0.x out there (Debian-based it seems),
|
|
which return STATUS_NOT_SUPPORTED rather than handling this info
|
|
class. We just fall back to using a standard directory query in
|
|
this case and note this case using the dirent_get_d_ino flag. */
|
|
if (!NT_SUCCESS (status) && status != STATUS_NO_MORE_FILES
|
|
&& (status == STATUS_INVALID_LEVEL
|
|
|| status == STATUS_NOT_SUPPORTED
|
|
|| status == STATUS_INVALID_PARAMETER
|
|
|| status == STATUS_INVALID_NETWORK_RESPONSE
|
|
|| status == STATUS_INVALID_INFO_CLASS))
|
|
dir->__flags &= ~dirent_get_d_ino;
|
|
/* Something weird happens on Samba up to version 3.0.21c, which is
|
|
fixed in 3.0.22. FileIdBothDirectoryInformation seems to work
|
|
nicely, but only up to the 128th entry in the directory. After
|
|
reaching this entry, the next call to NtQueryDirectoryFile
|
|
(FileIdBothDirectoryInformation) returns STATUS_INVALID_LEVEL.
|
|
Why should we care, we can just switch to
|
|
FileBothDirectoryInformation, isn't it? Nope! The next call to
|
|
NtQueryDirectoryFile(FileBothDirectoryInformation) actually
|
|
returns STATUS_NO_MORE_FILES, regardless how many files are left
|
|
unread in the directory. This does not happen when using
|
|
FileBothDirectoryInformation right from the start, but since
|
|
we can't decide whether the server we're talking with has this
|
|
bug or not, we end up serving Samba shares always in the slow
|
|
mode using FileBothDirectoryInformation. So, what we do here is
|
|
to implement the solution suggested by Andrew Tridgell, we just
|
|
reread all entries up to dir->d_position using
|
|
FileBothDirectoryInformation.
|
|
However, We do *not* mark this server as broken and fall back to
|
|
using FileBothDirectoryInformation further on. This would slow
|
|
down every access to such a server, even for directories under
|
|
128 entries. Also, bigger dirs only suffer from one additional
|
|
call per full directory scan, which shouldn't be too big a hit.
|
|
This can easily be changed if necessary. */
|
|
if (status == STATUS_INVALID_LEVEL && dir->__d_position)
|
|
{
|
|
d_cachepos (dir) = 0;
|
|
for (int cnt = 0; cnt < dir->__d_position; ++cnt)
|
|
{
|
|
if (d_cachepos (dir) == 0)
|
|
{
|
|
status = NtQueryDirectoryFile (get_handle (), NULL, NULL,
|
|
NULL, &io, d_cache (dir),
|
|
DIR_BUF_SIZE,
|
|
FileBothDirectoryInformation,
|
|
FALSE, NULL, cnt == 0);
|
|
if (!NT_SUCCESS (status))
|
|
goto go_ahead;
|
|
}
|
|
buf = (PFILE_ID_BOTH_DIR_INFORMATION) (d_cache (dir)
|
|
+ d_cachepos (dir));
|
|
if (buf->NextEntryOffset == 0)
|
|
d_cachepos (dir) = 0;
|
|
else
|
|
d_cachepos (dir) += buf->NextEntryOffset;
|
|
}
|
|
goto go_ahead;
|
|
}
|
|
}
|
|
if (!(dir->__flags & dirent_get_d_ino))
|
|
status = NtQueryDirectoryFile (get_handle (), NULL, NULL, NULL, &io,
|
|
d_cache (dir), DIR_BUF_SIZE,
|
|
(dir->__flags & dirent_nfs_d_ino)
|
|
? FileNamesInformation
|
|
: FileBothDirectoryInformation,
|
|
FALSE, NULL, dir->__d_position == 0);
|
|
}
|
|
|
|
go_ahead:
|
|
|
|
if (status == STATUS_NO_MORE_FILES)
|
|
/*nothing*/;
|
|
else if (!NT_SUCCESS (status))
|
|
debug_printf ("NtQueryDirectoryFile failed, status %p, win32 error %lu",
|
|
status, RtlNtStatusToDosError (status));
|
|
else
|
|
{
|
|
buf = (PFILE_ID_BOTH_DIR_INFORMATION) (d_cache (dir) + d_cachepos (dir));
|
|
if (buf->NextEntryOffset == 0)
|
|
d_cachepos (dir) = 0;
|
|
else
|
|
d_cachepos (dir) += buf->NextEntryOffset;
|
|
if ((dir->__flags & dirent_get_d_ino))
|
|
{
|
|
FileName = buf->FileName;
|
|
FileNameLength = buf->FileNameLength;
|
|
FileAttributes = buf->FileAttributes;
|
|
if ((dir->__flags & dirent_set_d_ino))
|
|
de->d_ino = buf->FileId.QuadPart;
|
|
}
|
|
else if ((dir->__flags & dirent_nfs_d_ino))
|
|
{
|
|
FileName = ((PFILE_NAMES_INFORMATION) buf)->FileName;
|
|
FileNameLength = ((PFILE_NAMES_INFORMATION) buf)->FileNameLength;
|
|
}
|
|
else
|
|
{
|
|
FileName = ((PFILE_BOTH_DIRECTORY_INFORMATION) buf)->FileName;
|
|
FileNameLength =
|
|
((PFILE_BOTH_DIRECTORY_INFORMATION) buf)->FileNameLength;
|
|
FileAttributes =
|
|
((PFILE_BOTH_DIRECTORY_INFORMATION) buf)->FileAttributes;
|
|
}
|
|
RtlInitCountedUnicodeString (&fname, FileName, FileNameLength);
|
|
de->d_ino = d_mounts (dir)->check_mount (&fname, de->d_ino);
|
|
if (de->d_ino == 0 && (dir->__flags & dirent_set_d_ino))
|
|
{
|
|
/* Don't try to optimize relative to dir->__d_position. On several
|
|
filesystems it's no safe bet that "." and ".." entries always
|
|
come first. */
|
|
if (FileNameLength == sizeof (WCHAR) && FileName[0] == '.')
|
|
de->d_ino = pc.get_ino_by_handle (get_handle ());
|
|
else if (FileNameLength == 2 * sizeof (WCHAR)
|
|
&& FileName[0] == L'.' && FileName[1] == L'.')
|
|
{
|
|
if (!(dir->__flags & dirent_isroot))
|
|
de->d_ino = readdir_get_ino (get_name (), true);
|
|
else
|
|
de->d_ino = pc.get_ino_by_handle (get_handle ());
|
|
}
|
|
else
|
|
{
|
|
OBJECT_ATTRIBUTES attr;
|
|
HANDLE hdl;
|
|
NTSTATUS f_status;
|
|
|
|
InitializeObjectAttributes (&attr, &fname,
|
|
pc.objcaseinsensitive (),
|
|
get_handle (), NULL);
|
|
/* FILE_OPEN_REPARSE_POINT on NFS is a no-op, so the normal
|
|
NtOpenFile here returns the inode number of the symlink target,
|
|
rather than the inode number of the symlink itself.
|
|
|
|
Worse, trying to open a symlink without setting the special
|
|
"ActOnSymlink" EA triggers a bug in Windows 7 which results
|
|
in a timeout of up to 20 seconds, followed by two exceptions
|
|
in the NT kernel.
|
|
|
|
Since both results are far from desirable, we open symlinks
|
|
on NFS so that we get the right inode and a happy W7.
|
|
And, since some filesystems choke on the EAs, we don't
|
|
use them unconditionally. */
|
|
f_status = (dir->__flags & dirent_nfs_d_ino)
|
|
? NtCreateFile (&hdl, READ_CONTROL, &attr, &io,
|
|
NULL, 0, FILE_SHARE_VALID_FLAGS,
|
|
FILE_OPEN, FILE_OPEN_FOR_BACKUP_INTENT,
|
|
&nfs_aol_ffei, sizeof nfs_aol_ffei)
|
|
: NtOpenFile (&hdl, READ_CONTROL, &attr, &io,
|
|
FILE_SHARE_VALID_FLAGS,
|
|
FILE_OPEN_FOR_BACKUP_INTENT
|
|
| FILE_OPEN_REPARSE_POINT);
|
|
if (NT_SUCCESS (f_status))
|
|
{
|
|
/* We call NtQueryInformationFile here, rather than
|
|
pc.get_ino_by_handle(), otherwise we can't short-circuit
|
|
dirent_set_d_ino correctly. */
|
|
FILE_INTERNAL_INFORMATION fai;
|
|
f_status = NtQueryInformationFile (hdl, &io, &fai, sizeof fai,
|
|
FileInternalInformation);
|
|
NtClose (hdl);
|
|
if (NT_SUCCESS (f_status))
|
|
{
|
|
if (pc.isgood_inode (fai.FileId.QuadPart))
|
|
de->d_ino = fai.FileId.QuadPart;
|
|
else
|
|
/* Untrusted file system. Don't try to fetch inode
|
|
number again. */
|
|
dir->__flags &= ~dirent_set_d_ino;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
if (!(res = readdir_helper (dir, de, RtlNtStatusToDosError (status),
|
|
FileAttributes, &fname)))
|
|
dir->__d_position++;
|
|
else if (!(dir->__flags & dirent_saw_dot))
|
|
{
|
|
strcpy (de->d_name , ".");
|
|
de->d_ino = pc.get_ino_by_handle (get_handle ());
|
|
de->d_type = DT_DIR;
|
|
dir->__d_position++;
|
|
dir->__flags |= dirent_saw_dot;
|
|
res = 0;
|
|
}
|
|
else if (!(dir->__flags & dirent_saw_dot_dot))
|
|
{
|
|
strcpy (de->d_name , "..");
|
|
if (!(dir->__flags & dirent_isroot))
|
|
de->d_ino = readdir_get_ino (get_name (), true);
|
|
else
|
|
de->d_ino = pc.get_ino_by_handle (get_handle ());
|
|
de->d_type = DT_DIR;
|
|
dir->__d_position++;
|
|
dir->__flags |= dirent_saw_dot_dot;
|
|
res = 0;
|
|
}
|
|
|
|
syscall_printf ("%d = readdir(%p, %p) (L\"%lS\" > \"%ls\") (attr %p > type %d)",
|
|
res, dir, &de, res ? NULL : &fname, res ? "***" : de->d_name,
|
|
FileAttributes, de->d_type);
|
|
return res;
|
|
}
|
|
|
|
long
|
|
fhandler_disk_file::telldir (DIR *dir)
|
|
{
|
|
return dir->__d_position;
|
|
}
|
|
|
|
void
|
|
fhandler_disk_file::seekdir (DIR *dir, long loc)
|
|
{
|
|
rewinddir (dir);
|
|
while (loc > dir->__d_position)
|
|
if (!::readdir (dir))
|
|
break;
|
|
}
|
|
|
|
void
|
|
fhandler_disk_file::rewinddir (DIR *dir)
|
|
{
|
|
d_cachepos (dir) = 0;
|
|
if (wincap.has_buggy_restart_scan () && isremote ())
|
|
{
|
|
/* This works around a W2K bug. The RestartScan parameter in calls
|
|
to NtQueryDirectoryFile on remote shares is ignored, thus
|
|
resulting in not being able to rewind on remote shares. By
|
|
reopening the directory, we get a fresh new directory pointer. */
|
|
OBJECT_ATTRIBUTES attr;
|
|
NTSTATUS status;
|
|
IO_STATUS_BLOCK io;
|
|
HANDLE new_dir;
|
|
|
|
pc.init_reopen_attr (&attr, get_handle ());
|
|
status = NtOpenFile (&new_dir, SYNCHRONIZE | FILE_LIST_DIRECTORY,
|
|
&attr, &io, FILE_SHARE_VALID_FLAGS,
|
|
FILE_SYNCHRONOUS_IO_NONALERT
|
|
| FILE_OPEN_FOR_BACKUP_INTENT
|
|
| FILE_DIRECTORY_FILE);
|
|
if (!NT_SUCCESS (status))
|
|
debug_printf ("Unable to reopen dir %s, NT error: %p",
|
|
get_name (), status);
|
|
else
|
|
{
|
|
NtClose (get_handle ());
|
|
set_io_handle (new_dir);
|
|
}
|
|
}
|
|
dir->__d_position = 0;
|
|
d_mounts (dir)->rewind ();
|
|
}
|
|
|
|
int
|
|
fhandler_disk_file::closedir (DIR *dir)
|
|
{
|
|
int res = 0;
|
|
|
|
delete d_mounts (dir);
|
|
syscall_printf ("%d = closedir(%p, %s)", res, dir, get_name ());
|
|
return res;
|
|
}
|
|
|
|
fhandler_cygdrive::fhandler_cygdrive () :
|
|
fhandler_disk_file (), ndrives (0), pdrive (NULL)
|
|
{
|
|
}
|
|
|
|
int
|
|
fhandler_cygdrive::open (int flags, mode_t mode)
|
|
{
|
|
if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
|
|
{
|
|
set_errno (EEXIST);
|
|
return 0;
|
|
}
|
|
if (flags & O_WRONLY)
|
|
{
|
|
set_errno (EISDIR);
|
|
return 0;
|
|
}
|
|
flags |= O_DIROPEN;
|
|
set_flags (flags);
|
|
nohandle (true);
|
|
return 1;
|
|
}
|
|
|
|
int
|
|
fhandler_cygdrive::close ()
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
fhandler_cygdrive::set_drives ()
|
|
{
|
|
pdrive = pdrive_buf;
|
|
ndrives = GetLogicalDriveStrings (sizeof pdrive_buf, pdrive_buf) / DRVSZ;
|
|
}
|
|
|
|
int
|
|
fhandler_cygdrive::fstat (struct __stat64 *buf)
|
|
{
|
|
fhandler_base::fstat (buf);
|
|
buf->st_ino = 2;
|
|
buf->st_mode = S_IFDIR | STD_RBITS | STD_XBITS;
|
|
buf->st_nlink = 1;
|
|
return 0;
|
|
}
|
|
|
|
int __stdcall
|
|
fhandler_cygdrive::fstatvfs (struct statvfs *sfs)
|
|
{
|
|
/* Virtual file system. Just return an empty buffer with a few values
|
|
set to something useful. Just as on Linux. */
|
|
memset (sfs, 0, sizeof (*sfs));
|
|
sfs->f_bsize = sfs->f_frsize = 4096;
|
|
sfs->f_namemax = NAME_MAX;
|
|
return 0;
|
|
}
|
|
|
|
DIR *
|
|
fhandler_cygdrive::opendir (int fd)
|
|
{
|
|
DIR *dir;
|
|
|
|
dir = fhandler_disk_file::opendir (fd);
|
|
if (dir && !ndrives)
|
|
set_drives ();
|
|
|
|
return dir;
|
|
}
|
|
|
|
int
|
|
fhandler_cygdrive::readdir (DIR *dir, dirent *de)
|
|
{
|
|
WCHAR drive[] = L"X:";
|
|
|
|
while (true)
|
|
{
|
|
if (!pdrive || !*pdrive)
|
|
{
|
|
if (!(dir->__flags & dirent_saw_dot))
|
|
{
|
|
de->d_name[0] = '.';
|
|
de->d_name[1] = '\0';
|
|
de->d_ino = 2;
|
|
}
|
|
return ENMFILE;
|
|
}
|
|
disk_type dt = get_disk_type ((drive[0] = *pdrive, drive));
|
|
if (dt == DT_SHARE_SMB)
|
|
{
|
|
/* Calling NetUseGetInfo on SMB drives allows to fetch the
|
|
current state of the drive without trying to open a file
|
|
descriptor on the share (GetFileAttributes). This avoids
|
|
waiting for SMB timeouts. Of course, there's a downside:
|
|
If a drive becomes availabe again, it can take a couple of
|
|
minutes to recognize it. As long as this didn't happen,
|
|
the drive will not show up in the cygdrive dir. */
|
|
PUSE_INFO_1 pui1;
|
|
DWORD status;
|
|
|
|
if (NetUseGetInfo (NULL, drive, 1, (PBYTE *) &pui1) == NERR_Success)
|
|
{
|
|
status = pui1->ui1_status;
|
|
NetApiBufferFree (pui1);
|
|
if (status == USE_OK)
|
|
break;
|
|
}
|
|
}
|
|
else if (dt != DT_FLOPPY
|
|
&& GetFileAttributes (pdrive) != INVALID_FILE_ATTRIBUTES)
|
|
break;
|
|
pdrive = strchr (pdrive, '\0') + 1;
|
|
}
|
|
*de->d_name = cyg_tolower (*pdrive);
|
|
de->d_name[1] = '\0';
|
|
user_shared->warned_msdos = true;
|
|
de->d_ino = readdir_get_ino (pdrive, false);
|
|
dir->__d_position++;
|
|
pdrive = strchr (pdrive, '\0') + 1;
|
|
syscall_printf ("%p = readdir (%p) (%s)", &de, dir, de->d_name);
|
|
return 0;
|
|
}
|
|
|
|
void
|
|
fhandler_cygdrive::rewinddir (DIR *dir)
|
|
{
|
|
pdrive = pdrive_buf;
|
|
dir->__d_position = 0;
|
|
}
|
|
|
|
int
|
|
fhandler_cygdrive::closedir (DIR *dir)
|
|
{
|
|
pdrive = pdrive_buf;
|
|
return 0;
|
|
}
|