static int winfs_stat(struct file *f, struct newstat *buf)
{
AcquireSRWLockShared(&f->rw_lock);
struct winfs_file *winfile = (struct winfs_file *) f;
BY_HANDLE_FILE_INFORMATION info;
GetFileInformationByHandle(winfile->handle, &info);
/* Programs (ld.so) may use st_dev and st_ino to identity files so these must be unique for each file. */
INIT_STRUCT_NEWSTAT_PADDING(buf);
buf->st_dev = mkdev(8, 0); // (8, 0): /dev/sda
//buf->st_ino = ((uint64_t)info.nFileIndexHigh << 32ULL) + info.nFileIndexLow;
/* Hash 64 bit inode to 32 bit to fix legacy applications
* We may later add an option for changing this behaviour
*/
buf->st_ino = info.nFileIndexHigh ^ info.nFileIndexLow;
if (info.dwFileAttributes & FILE_ATTRIBUTE_READONLY)
buf->st_mode = 0555;
else
buf->st_mode = 0755;
if (info.dwFileAttributes & FILE_ATTRIBUTE_DIRECTORY)
{
buf->st_mode |= S_IFDIR;
buf->st_size = 0;
}
else
{
int r;
if ((info.dwFileAttributes & FILE_ATTRIBUTE_SYSTEM)
&& (r = winfs_read_symlink_unsafe(winfile->handle, NULL, 0)) > 0)
{
buf->st_mode |= S_IFLNK;
buf->st_size = r;
}
else
{
buf->st_mode |= S_IFREG;
buf->st_size = ((uint64_t)info.nFileSizeHigh << 32ULL) + info.nFileSizeLow;
}
}
buf->st_nlink = info.nNumberOfLinks;
buf->st_uid = 0;
buf->st_gid = 0;
buf->st_rdev = 0;
buf->st_blksize = PAGE_SIZE;
buf->st_blocks = (buf->st_size + buf->st_blksize - 1) / buf->st_blksize;
buf->st_atime = filetime_to_unix_sec(&info.ftLastAccessTime);
buf->st_atime_nsec = filetime_to_unix_nsec(&info.ftLastAccessTime);
buf->st_mtime = filetime_to_unix_sec(&info.ftLastWriteTime);
buf->st_mtime_nsec = filetime_to_unix_nsec(&info.ftLastWriteTime);
buf->st_ctime = filetime_to_unix_sec(&info.ftCreationTime);
buf->st_ctime_nsec = filetime_to_unix_nsec(&info.ftCreationTime);
ReleaseSRWLockShared(&f->rw_lock);
return 0;
}
static size_t winfs_readlink(struct file *f, char *target, size_t buflen)
{
/* This file is a symlink, so read(), write() should not be called on this file
* Thus we don't need to lock the file pointer
*/
/* TODO: Store the file type in winfile structure so we can be sure this file is really a symlink */
AcquireSRWLockShared(&f->rw_lock);
struct winfs_file *winfile = (struct winfs_file *) f;
int r = winfs_read_symlink_unsafe(winfile->handle, target, (int)buflen);
ReleaseSRWLockShared(&f->rw_lock);
if (r == 0)
return -L_EINVAL;
return r;
}
/* Open a file
* Return values:
* < 0 => errno
* == 0 => Opening file succeeded
* > 0 => It is a symlink which needs to be redirected (target written)
*/
static int open_file(HANDLE *hFile, struct mount_point *mp, const char *pathname,
DWORD desired_access, DWORD create_disposition, DWORD attributes,
int flags, BOOL bInherit, char *target, int buflen, char *drive_letter)
{
WCHAR buf[PATH_MAX];
UNICODE_STRING name;
name.Buffer = buf;
name.MaximumLength = name.Length = 2 * filename_to_nt_pathname(mp, pathname, buf, PATH_MAX);
if (name.Length == 0)
return -L_ENOENT;
*drive_letter = buf[4];
OBJECT_ATTRIBUTES attr;
attr.Length = sizeof(OBJECT_ATTRIBUTES);
attr.RootDirectory = NULL;
attr.ObjectName = &name;
attr.Attributes = (bInherit? OBJ_INHERIT: 0);
attr.SecurityDescriptor = NULL;
attr.SecurityQualityOfService = NULL;
NTSTATUS status;
IO_STATUS_BLOCK status_block;
HANDLE handle;
DWORD create_options = FILE_SYNCHRONOUS_IO_NONALERT; /* For synchronous I/O */
if (desired_access & GENERIC_ALL)
create_options |= FILE_OPEN_FOR_BACKUP_INTENT | FILE_OPEN_REMOTE_INSTANCE;
else
{
if (desired_access & GENERIC_READ)
create_options |= FILE_OPEN_FOR_BACKUP_INTENT;
if (desired_access & GENERIC_WRITE)
create_options |= FILE_OPEN_REMOTE_INSTANCE;
}
desired_access |= SYNCHRONIZE | FILE_READ_ATTRIBUTES;
status = NtCreateFile(&handle, desired_access, &attr, &status_block, NULL,
attributes, FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE,
create_disposition, create_options, NULL, 0);
if (status == STATUS_OBJECT_NAME_COLLISION)
{
log_warning("File already exists.");
return -L_EEXIST;
}
else if (!NT_SUCCESS(status))
{
log_warning("Unhandled NtCreateFile error, status: %x, returning ENOENT.", status);
return -L_ENOENT;
}
FILE_ATTRIBUTE_TAG_INFORMATION attribute_info;
status = NtQueryInformationFile(handle, &status_block, &attribute_info, sizeof(attribute_info), FileAttributeTagInformation);
if (!NT_SUCCESS(status))
{
log_error("NtQueryInformationFile(FileAttributeTagInformation) failed, status: %x", status);
NtClose(handle);
return -L_EIO;
}
/* Test if the file is a symlink */
int is_symlink = 0;
if (!(attribute_info.FileAttributes & FILE_ATTRIBUTE_DIRECTORY) && (attribute_info.FileAttributes & FILE_ATTRIBUTE_SYSTEM))
{
/* The file has system flag set. A potential symbolic link. */
if (!(desired_access & GENERIC_READ))
{
/* But the handle does not have READ access, try reopening file */
HANDLE read_handle = ReOpenFile(handle, desired_access | GENERIC_READ,
FILE_SHARE_READ | FILE_SHARE_WRITE | FILE_SHARE_DELETE, FILE_FLAG_BACKUP_SEMANTICS);
if (read_handle == INVALID_HANDLE_VALUE)
{
log_warning("Reopen symlink file failed, error code %d. Assume not symlink.", GetLastError());
*hFile = handle;
return 0;
}
NtClose(handle);
handle = read_handle;
}
if (winfs_read_symlink_unsafe(handle, target, buflen) > 0)
{
if (!(flags & O_NOFOLLOW))
{
NtClose(handle);
return 1;
}
if (!(flags & O_PATH))
{
NtClose(handle);
log_info("Specified O_NOFOLLOW but not O_PATH, returning ELOOP.");
return -L_ELOOP;
}
}
}
else if (!(attribute_info.FileAttributes & FILE_ATTRIBUTE_DIRECTORY) && (flags & O_DIRECTORY))
{
log_warning("Not a directory.");
return -L_ENOTDIR;
}
*hFile = handle;
return 0;
}