- FspFileSystemAcquireDirectoryBufferEx takes hint for initial capacity.
- Buffer allocation strategy has been improved to minimize reallocation.
- Quick sort of directory entries now implements median of three partitioning. This improves performance of sorting already sorted data.
DeleteFileW and RemoveDirectoryW in recent versions of Windows 10 have
been changed to perform a FileDispositionInformationEx with POSIX
semantics and if that fails to retry with FileDispositionInformation.
Unfortunately this is done even for legitimate error codes such as
STATUS_DIRECTORY_NOT_EMPTY.
This means that user mode file systems have to do unnecessary CanDelete
checks even when they support FileDispositionInformationEx. The extra
check incurs extra context switches, and in some cases it may also be
costly to compute (e.g. FUSE).
We optimize this away by storing the status of the last CanDelete check
in the FileDesc and then continue returning the same status code for
all checks for the same FileDesc.
- Symlinks: Now supports conventing a directory into a symlink reparse
point.
- Symlinks: The determination of whether a symlink is a file or
directory is now possible for file systems that do not support slashdot
(/.) queries.
- EA: Now allows the removal of non-existant EA without error (this is
allowed on Windows).
When the kernel sends a `Create` message the WinFsp-FUSE layer creates
and opens the file (as per Windows semantics). Sometimes an additional
operation needs to be performed after the file has been opened, which
may fail. In this case the just opened file must be released.
In this particular case the WinFsp-FUSE layer used to call `release`
with an uninitialized path. This commit fixes the problem.
This problem was originally reported in cgofuse (billziss-gh/cgofuse#58)
