/* fhandler_disk_file.cc Copyright 1996, 1997, 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006, 2007, 2008, 2009, 2010, 2011, 2012, 2013, 2014, 2015 Red Hat, Inc. This file is part of Cygwin. This software is a copyrighted work licensed under the terms of the Cygwin license. Please consult the file "CYGWIN_LICENSE" for details. */ #include "winsup.h" #include #include #include #include #include #include "cygerrno.h" #include "security.h" #include "path.h" #include "fhandler.h" #include "dtable.h" #include "cygheap.h" #include "shared_info.h" #include "pinfo.h" #include "ntdll.h" #include "tls_pbuf.h" #include "devices.h" #include "ldap.h" #define _COMPILING_NEWLIB #include class __DIR_mounts { int count; const char *parent_dir; int parent_dir_len; UNICODE_STRING mounts[MAX_MOUNTS]; bool found[MAX_MOUNTS + 3]; UNICODE_STRING cygdrive; #define __DIR_PROC (MAX_MOUNTS) #define __DIR_CYGDRIVE (MAX_MOUNTS+1) #define __DIR_DEV (MAX_MOUNTS+2) ino_t eval_ino (int idx) { ino_t ino = 0; char fname[parent_dir_len + mounts[idx].Length + 2]; struct stat st; char *c = stpcpy (fname, parent_dir); if (c[- 1] != '/') *c++ = '/'; sys_wcstombs (c, mounts[idx].Length + 1, mounts[idx].Buffer, mounts[idx].Length / sizeof (WCHAR)); path_conv pc (fname, PC_SYM_NOFOLLOW | PC_POSIX | PC_KEEP_HANDLE); if (!stat_worker (pc, &st)) ino = st.st_ino; return ino; } public: __DIR_mounts (const char *posix_path) : parent_dir (posix_path) { parent_dir_len = strlen (parent_dir); count = mount_table->get_mounts_here (parent_dir, parent_dir_len, mounts, &cygdrive); rewind (); } ~__DIR_mounts () { for (int i = 0; i < count; ++i) RtlFreeUnicodeString (&mounts[i]); RtlFreeUnicodeString (&cygdrive); } ino_t check_mount (PUNICODE_STRING fname, ino_t ino, bool eval = true) { if (parent_dir_len == 1) /* root dir */ { if (RtlEqualUnicodeString (fname, &ro_u_proc, FALSE)) { found[__DIR_PROC] = true; return 2; } if (RtlEqualUnicodeString (fname, &ro_u_dev, FALSE)) { found[__DIR_DEV] = true; return 2; } if (fname->Length / sizeof (WCHAR) == mount_table->cygdrive_len - 2 && RtlEqualUnicodeString (fname, &cygdrive, FALSE)) { found[__DIR_CYGDRIVE] = true; return 2; } } for (int i = 0; i < count; ++i) if (RtlEqualUnicodeString (fname, &mounts[i], FALSE)) { found[i] = true; return eval ? eval_ino (i) : 1; } return ino; } ino_t check_missing_mount (PUNICODE_STRING retname = NULL) { for (int i = 0; i < count; ++i) if (!found[i]) { found[i] = true; if (retname) { *retname = mounts[i]; return eval_ino (i); } return 1; } if (parent_dir_len == 1) /* root dir */ { if (!found[__DIR_PROC]) { found[__DIR_PROC] = true; if (retname) *retname = ro_u_proc; return 2; } if (!found[__DIR_DEV]) { found[__DIR_DEV] = true; if (retname) *retname = ro_u_dev; return 2; } if (!found[__DIR_CYGDRIVE]) { found[__DIR_CYGDRIVE] = true; if (cygdrive.Length > 0) { if (retname) *retname = cygdrive; return 2; } } } return 0; } void rewind () { memset (found, 0, sizeof found); } }; inline bool path_conv::isgood_inode (ino_t ino) const { /* If the FS doesn't support nonambiguous inode numbers anyway, bail out immediately. */ if (!hasgood_inode ()) return false; /* If the inode numbers are 64 bit numbers or if it's a local FS, they are to be trusted. */ if (ino > UINT32_MAX || !isremote ()) return true; /* The inode numbers returned from a remote NT4 NTFS are ephemeral 32 bit numbers. */ if (fs_is_ntfs ()) return false; /* Starting with version 3.5.4, Samba returns the real inode numbers, if the file is on the same device as the root of the share (Samba function get_FileIndex). 32 bit inode numbers returned by older versions (likely < 3.0) are ephemeral. */ if (fs_is_samba () && fs.samba_version () < 0x03050400) return false; /* Otherwise, trust the inode numbers unless proved otherwise. */ return true; } /* Check reparse point for type. IO_REPARSE_TAG_MOUNT_POINT types are either volume mount points, which are treated as directories, or they are directory mount points, which are treated as symlinks. IO_REPARSE_TAG_SYMLINK types are always symlinks. We don't know anything about other reparse points, so they are treated as unknown. */ static inline int readdir_check_reparse_point (POBJECT_ATTRIBUTES attr) { DWORD ret = DT_UNKNOWN; IO_STATUS_BLOCK io; HANDLE reph; UNICODE_STRING subst; if (NT_SUCCESS (NtOpenFile (&reph, READ_CONTROL, attr, &io, FILE_SHARE_VALID_FLAGS, FILE_OPEN_FOR_BACKUP_INTENT | FILE_OPEN_REPARSE_POINT))) { PREPARSE_DATA_BUFFER rp = (PREPARSE_DATA_BUFFER) alloca (MAXIMUM_REPARSE_DATA_BUFFER_SIZE); if (NT_SUCCESS (NtFsControlFile (reph, NULL, NULL, NULL, &io, FSCTL_GET_REPARSE_POINT, NULL, 0, (LPVOID) rp, MAXIMUM_REPARSE_DATA_BUFFER_SIZE))) { if (rp->ReparseTag == IO_REPARSE_TAG_MOUNT_POINT) { RtlInitCountedUnicodeString (&subst, (WCHAR *)((char *)rp->MountPointReparseBuffer.PathBuffer + rp->MountPointReparseBuffer.SubstituteNameOffset), rp->MountPointReparseBuffer.SubstituteNameLength); /* Only volume mountpoints are treated as directories. */ if (RtlEqualUnicodePathPrefix (&subst, &ro_u_volume, TRUE)) ret = DT_DIR; else ret = DT_LNK; } else if (rp->ReparseTag == IO_REPARSE_TAG_SYMLINK) ret = DT_LNK; NtClose (reph); } } return ret; } inline ino_t path_conv::get_ino_by_handle (HANDLE hdl) { IO_STATUS_BLOCK io; FILE_INTERNAL_INFORMATION fai; if (NT_SUCCESS (NtQueryInformationFile (hdl, &io, &fai, sizeof fai, FileInternalInformation)) && isgood_inode (fai.FileId.QuadPart)) return fai.FileId.QuadPart; return 0; } #if 0 /* This function is obsolete. We're keeping it in so we don't forget that we already did all that at one point. */ unsigned __stdcall path_conv::ndisk_links (DWORD nNumberOfLinks) { if (!isdir () || isremote ()) return nNumberOfLinks; OBJECT_ATTRIBUTES attr; IO_STATUS_BLOCK io; HANDLE fh; if (!NT_SUCCESS (NtOpenFile (&fh, SYNCHRONIZE | FILE_LIST_DIRECTORY, get_object_attr (attr, sec_none_nih), &io, FILE_SHARE_VALID_FLAGS, FILE_SYNCHRONOUS_IO_NONALERT | FILE_OPEN_FOR_BACKUP_INTENT | FILE_DIRECTORY_FILE))) return nNumberOfLinks; unsigned count = 0; bool first = true; PFILE_BOTH_DIR_INFORMATION fdibuf = (PFILE_BOTH_DIR_INFORMATION) alloca (65536); __DIR_mounts *dir = new __DIR_mounts (get_posix ()); while (NT_SUCCESS (NtQueryDirectoryFile (fh, NULL, NULL, NULL, &io, fdibuf, 65536, FileBothDirectoryInformation, FALSE, NULL, first))) { if (first) { first = false; /* All directories have . and .. as their first entries. If . is not present as first entry, we're on a drive's root direcotry, which doesn't have these entries. */ if (fdibuf->FileNameLength != 2 || fdibuf->FileName[0] != L'.') count = 2; } for (PFILE_BOTH_DIR_INFORMATION pfdi = fdibuf; pfdi; pfdi = (PFILE_BOTH_DIR_INFORMATION) (pfdi->NextEntryOffset ? (PBYTE) pfdi + pfdi->NextEntryOffset : NULL)) { switch (pfdi->FileAttributes & (FILE_ATTRIBUTE_DIRECTORY | FILE_ATTRIBUTE_REPARSE_POINT)) { case FILE_ATTRIBUTE_DIRECTORY: /* Just a directory */ ++count; break; case FILE_ATTRIBUTE_DIRECTORY | FILE_ATTRIBUTE_REPARSE_POINT: /* Volume mount point or symlink to directory */ { UNICODE_STRING fname; RtlInitCountedUnicodeString (&fname, pfdi->FileName, pfdi->FileNameLength); InitializeObjectAttributes (&attr, &fname, objcaseinsensitive (), fh, NULL); if (is_volume_mountpoint (&attr)) ++count; } break; default: break; } UNICODE_STRING fname; RtlInitCountedUnicodeString (&fname, pfdi->FileName, pfdi->FileNameLength); dir->check_mount (&fname, 0, false); } } while (dir->check_missing_mount ()) ++count; NtClose (fh); delete dir; return count; } #endif /* For files on NFS shares, we request an EA of type NfsV3Attributes. This returns the content of a struct fattr3 as defined in RFC 1813. The content is the NFS equivalent of struct stat. so there's not much to do here except for copying. */ int __reg2 fhandler_base::fstat_by_nfs_ea (struct stat *buf) { fattr3 *nfs_attr = pc.nfsattr (); PWCHAR domain; cyg_ldap cldap; bool ldap_open = false; if (get_io_handle ()) { /* NFS stumbles over its own caching. If you write to the file, a subsequent fstat does not return the actual size of the file, but the size at the time the handle has been opened. Unless access through another handle invalidates the caching within the NFS client. */ if (get_access () & GENERIC_WRITE) FlushFileBuffers (get_io_handle ()); nfs_fetch_fattr3 (get_io_handle (), nfs_attr); } buf->st_dev = nfs_attr->fsid; buf->st_ino = nfs_attr->fileid; buf->st_mode = (nfs_attr->mode & 0xfff) | nfs_type_mapping[nfs_attr->type & 7]; buf->st_nlink = nfs_attr->nlink; /* Try to map UNIX uid/gid to Cygwin uid/gid. If there's no mapping in the cache, try to fetch it from the configured RFC 2307 domain (see last comment in cygheap_domain_info::init() for more information) and add it to the mapping cache. */ buf->st_uid = cygheap->ugid_cache.get_uid (nfs_attr->uid); buf->st_gid = cygheap->ugid_cache.get_gid (nfs_attr->gid); if (buf->st_uid == ILLEGAL_UID) { uid_t map_uid = ILLEGAL_UID; domain = cygheap->dom.get_rfc2307_domain (); if ((ldap_open = (cldap.open (domain) == NO_ERROR))) map_uid = cldap.remap_uid (nfs_attr->uid); if (map_uid == ILLEGAL_UID) map_uid = MAP_UNIX_TO_CYGWIN_ID (nfs_attr->uid); cygheap->ugid_cache.add_uid (nfs_attr->uid, map_uid); buf->st_uid = map_uid; } if (buf->st_gid == ILLEGAL_GID) { gid_t map_gid = ILLEGAL_GID; domain = cygheap->dom.get_rfc2307_domain (); if ((ldap_open || cldap.open (domain) == NO_ERROR)) map_gid = cldap.remap_gid (nfs_attr->gid); if (map_gid == ILLEGAL_GID) map_gid = MAP_UNIX_TO_CYGWIN_ID (nfs_attr->gid); cygheap->ugid_cache.add_gid (nfs_attr->gid, map_gid); buf->st_gid = map_gid; } buf->st_rdev = makedev (nfs_attr->rdev.specdata1, nfs_attr->rdev.specdata2); buf->st_size = nfs_attr->size; buf->st_blksize = PREFERRED_IO_BLKSIZE; buf->st_blocks = (nfs_attr->used + S_BLKSIZE - 1) / S_BLKSIZE; buf->st_atim.tv_sec = nfs_attr->atime.tv_sec; buf->st_atim.tv_nsec = nfs_attr->atime.tv_nsec; buf->st_mtim.tv_sec = nfs_attr->mtime.tv_sec; buf->st_mtim.tv_nsec = nfs_attr->mtime.tv_nsec; buf->st_ctim.tv_sec = nfs_attr->ctime.tv_sec; buf->st_ctim.tv_nsec = nfs_attr->ctime.tv_nsec; return 0; } int __reg2 fhandler_base::fstat_by_handle (struct stat *buf) { /* Don't use FileAllInformation info class. It returns a pathname rather than a filename, so it needs a really big buffer for no good reason since we don't need the name anyway. So we just call the three info classes necessary to get all information required by stat(2). */ FILE_STANDARD_INFORMATION fsi; FILE_INTERNAL_INFORMATION fii; HANDLE h = get_stat_handle (); NTSTATUS status = 0; IO_STATUS_BLOCK io; /* If the file has been opened for other purposes than stat, we can't rely on the information stored in pc.fnoi. So we overwrite them here. */ if (get_io_handle ()) { status = file_get_fnoi (h, pc.fs_is_netapp (), pc.fnoi ()); if (!NT_SUCCESS (status)) { debug_printf ("%y = NtQueryInformationFile(%S, " "FileNetworkOpenInformation)", status, pc.get_nt_native_path ()); return -1; } } if (!pc.hasgood_inode ()) fsi.NumberOfLinks = 1; else { status = NtQueryInformationFile (h, &io, &fsi, sizeof fsi, FileStandardInformation); if (!NT_SUCCESS (status)) { debug_printf ("%y = NtQueryInformationFile(%S, " "FileStandardInformation)", status, pc.get_nt_native_path ()); return -1; } if (!ino) { status = NtQueryInformationFile (h, &io, &fii, sizeof fii, FileInternalInformation); if (!NT_SUCCESS (status)) { debug_printf ("%y = NtQueryInformationFile(%S, " "FileInternalInformation)", status, pc.get_nt_native_path ()); return -1; } else if (pc.isgood_inode (fii.FileId.QuadPart)) ino = fii.FileId.QuadPart; } } return fstat_helper (buf, fsi.NumberOfLinks); } int __reg2 fhandler_base::fstat_by_name (struct stat *buf) { NTSTATUS status; OBJECT_ATTRIBUTES attr; IO_STATUS_BLOCK io; UNICODE_STRING dirname; UNICODE_STRING basename; HANDLE dir; struct { FILE_ID_BOTH_DIR_INFORMATION fdi; WCHAR buf[NAME_MAX + 1]; } fdi_buf; if (!ino && pc.hasgood_inode () && !pc.has_buggy_fileid_dirinfo ()) { RtlSplitUnicodePath (pc.get_nt_native_path (), &dirname, &basename); InitializeObjectAttributes (&attr, &dirname, pc.objcaseinsensitive (), NULL, NULL); status = NtOpenFile (&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 ("%y = NtOpenFile(%S)", status, pc.get_nt_native_path ()); else { status = NtQueryDirectoryFile (dir, NULL, NULL, NULL, &io, &fdi_buf.fdi, sizeof fdi_buf, FileIdBothDirectoryInformation, TRUE, &basename, TRUE); NtClose (dir); if (!NT_SUCCESS (status)) debug_printf ("%y = NtQueryDirectoryFile(%S)", status, pc.get_nt_native_path ()); else ino = fdi_buf.fdi.FileId.QuadPart; } } return fstat_helper (buf, 1); } int __reg2 fhandler_base::fstat_fs (struct stat *buf) { int res = -1; int oret; int open_flags = O_RDONLY | O_BINARY; if (get_stat_handle ()) { if (!nohandle () && !is_fs_special ()) res = pc.fs_is_nfs () ? fstat_by_nfs_ea (buf) : fstat_by_handle (buf); if (res) res = fstat_by_name (buf); return res; } /* 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. */ oret = open_fs (open_flags, 0); if (!oret) { query_open (query_read_attributes); oret = open_fs (open_flags, 0); } if (oret) { /* We now have a valid handle, regardless of the "nohandle" state. Since fhandler_base::close 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 __reg3 fhandler_base::fstat_helper (struct stat *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 (&pfnoi->LastAccessTime, &buf->st_atim); to_timestruc_t (&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 ? &pfnoi->ChangeTime : &pfnoi->LastWriteTime, &buf->st_ctim); to_timestruc_t (&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 : (off_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 = (ino_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. */ status = NtOpenFile (&h, SYNCHRONIZE | FILE_READ_DATA, pc.init_reopen_attr (attr, h), &io, FILE_SHARE_VALID_FLAGS, FILE_OPEN_FOR_BACKUP_INTENT | FILE_SYNCHRONOUS_IO_NONALERT); if (!NT_SUCCESS (status)) debug_printf ("%y = 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 ("%y = 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=0%o, st_ino=%D" "st_atim=%lx.%lx st_ctim=%lx.%lx " "st_mtim=%lx.%lx st_birthtim=%lx.%lx", 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 __reg2 fhandler_disk_file::fstat (struct stat *buf) { return fstat_fs (buf); } int __reg2 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; /* 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. */ 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 = (fsblkcnt_t) full_fsi.TotalAllocationUnits.QuadPart; sfs->f_bfree = (fsblkcnt_t) full_fsi.ActualAvailableAllocationUnits.QuadPart; sfs->f_bavail = (fsblkcnt_t) full_fsi.CallerAvailableAllocationUnits.QuadPart; 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 ("%y = NtFsControlFile(%S, FSCTL_GET_NTFS_VOLUME_DATA)", status, pc.get_nt_native_path ()); else sfs->f_blocks = (fsblkcnt_t) nvdb.TotalClusters.QuadPart; } ret = 0; } else if (status == STATUS_INVALID_PARAMETER /* Netapp */ || status == STATUS_INVALID_INFO_CLASS) { FILE_FS_SIZE_INFORMATION fsi; status = NtQueryVolumeInformationFile (fh, &io, &fsi, sizeof fsi, FileFsSizeInformation); if (NT_SUCCESS (status)) { sfs->f_bsize = fsi.BytesPerSector * fsi.SectorsPerAllocationUnit; sfs->f_frsize = sfs->f_bsize; sfs->f_blocks = (fsblkcnt_t) fsi.TotalAllocationUnits.QuadPart; sfs->f_bfree = sfs->f_bavail = (fsblkcnt_t) fsi.AvailableAllocationUnits.QuadPart; ret = 0; } else debug_printf ("%y = NtQueryVolumeInformationFile" "(%S, FileFsSizeInformation)", status, pc.get_nt_native_path ()); } else debug_printf ("%y = NtQueryVolumeInformationFile" "(%S, FileFsFullSizeInformation)", status, pc.get_nt_native_path ()); out: if (opened) NtClose (fh); syscall_printf ("%d = fstatvfs(%s, %p)", ret, get_name (), sfs); return ret; } int __reg1 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; if (NT_SUCCESS (NtOpenFile (&fh, FILE_WRITE_ATTRIBUTES, pc.init_reopen_attr (attr, get_handle ()), &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 __reg2 fhandler_disk_file::fchown (uid_t uid, gid_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; uid_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 winbind 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 ()) { PSID sid; if (old_uid == ILLEGAL_UID || ((sid = sidfromuid (old_uid, NULL)) != NO_SID && 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 __reg3 fhandler_disk_file::facl (int cmd, int nentries, aclent_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 stat 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; 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 (off_t offset, off_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 (off_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.support_sparse () && !has_attribute (FILE_ATTRIBUTE_SPARSE_FILE) && length >= fsi.EndOfFile.QuadPart + (128 * 1024)) { status = NtFsControlFile (get_handle (), NULL, NULL, NULL, &io, FSCTL_SET_SPARSE, NULL, 0, NULL, 0); if (NT_SUCCESS (status)) pc.file_attributes (pc.file_attributes () | FILE_ATTRIBUTE_SPARSE_FILE); syscall_printf ("%y = 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 %ly %ly", 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], &fbi.LastAccessTime); timespec_to_filetime (&tmp[1], &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; if (NT_SUCCESS (NtOpenFile (&fh, FILE_WRITE_ATTRIBUTES, pc.init_reopen_attr (attr, get_handle ()), &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); return fhandler_base::close (); } int fhandler_disk_file::fcntl (int cmd, intptr_t arg) { int res; switch (cmd) { case F_LCK_MANDATORY: /* Mandatory locking only works on files. */ mandatory_locking (!!arg); need_fork_fixup (true); res = 0; break; default: res = fhandler_base::fcntl (cmd, arg); break; } return res; } 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)) fhc->prw_handle = NULL; return ret; } void fhandler_disk_file::fixup_after_fork (HANDLE parent) { prw_handle = NULL; mandatory_locking (false); 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 ()); out: syscall_printf ("%d = fhandler_disk_file::open(%S, %y)", 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 (); status = NtOpenFile (&prw_handle, access, pc.init_reopen_attr (attr, get_handle ()), &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 ("%y = NtOpenFile (%p, %y, %S, io, %y, %y)", 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 __reg3 fhandler_disk_file::pread (void *buf, size_t count, off_t offset) { ssize_t res; if ((get_flags () & O_ACCMODE) == O_WRONLY) { set_errno (EBADF); return -1; } /* In binary mode, we can use an atomic NtReadFile call. Windows mandatory locking semantics disallow to use another HANDLE. */ if (rbinary () && !mandatory_locking ()) { 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) && status != STATUS_END_OF_FILE) { 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; } res = io.Information; /* Valid on EOF. */ } else { non_atomic: /* Text mode stays slow and non-atomic. */ off_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, %ld, %D)\n", res, buf, count, offset); return res; } ssize_t __reg3 fhandler_disk_file::pwrite (void *buf, size_t count, off_t offset) { if ((get_flags () & O_ACCMODE) == O_RDONLY) { set_errno (EBADF); return -1; } /* In binary mode, we can use an atomic NtWriteFile call. Windows mandatory locking semantics disallow to use another HANDLE. */ if (wbinary () && !mandatory_locking ()) { 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; off_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, %ld, %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]; 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 = 0; if (pc.iscygdrive ()) { if (fd < 0 && !open (O_RDONLY, 0)) goto free_mounts; } else { dir->__d_internal = (uintptr_t) new __DIR_mounts (get_name ()); d_cachepos (dir) = 0; 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. Instead of testing for yet another error code, let's use FileIdBothDirectoryInformation only on FSes 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; } 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; } ino_t __reg2 readdir_get_ino (const char *path, bool dot_dot) { char *fname; struct stat st; HANDLE hdl; OBJECT_ATTRIBUTES attr; IO_STATUS_BLOCK io; ino_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); } if (de->d_ino == 2) /* Inode number for virtual dirs. */ de->d_type = DT_DIR; 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.get_posix ()); 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. 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 %y, win32 error %u", 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_DIR_INFORMATION) buf)->FileName; FileNameLength = ((PFILE_BOTH_DIR_INFORMATION) buf)->FileNameLength; FileAttributes = ((PFILE_BOTH_DIR_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 %y > 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; 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; } /* Open a fake handle to \\Device\\Null */ return open_null (flags); } void fhandler_cygdrive::set_drives () { pdrive = pdrive_buf; ndrives = GetLogicalDriveStrings (sizeof pdrive_buf, pdrive_buf) / DRVSZ; } int fhandler_cygdrive::fstat (struct stat *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 __reg2 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_flag = ST_RDONLY; 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; }