winfsp/winfsp v1.10B1

WinFsp 2021.1 Beta1

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CHANGES SINCE WINFSP 2021

• [NEW] WinFsp now supports rebranding of the build products. This is primarily useful to commercial licensees. See https://github.com/billziss-gh/winfsp/wiki/WinFsp-Rebranding for more information.

• [NEW] WinFsp-FUSE has a new method for determining file access in the case where the user's primary SID (Windows Security Identifier) and group SID are the same (for example, this can happen when someone uses a Microsoft account as their primary login).

  • Previously when the user SID and group SID were the same WinFsp-FUSE looked at the UNIX permissions for the owner and the UNIX permissions for the group and used the MOST restrictive permissions, which often resulted in inadvertent "access denied" errors. (For example, if the owner permission was rw- and the group permission was --- the result was --- and therefore access denied).

  • Going forward this behavior will change. The user and group mode permissions will not be considered together even in the case where the user SID and group SID are the same. This will resolve the access denied errors.

  • However to preserve backward compatibility (there might be some file systems that rely on the old behavior) we will do so in stages. For release v1.10 (2021.1) there is a new registry setting under HKLM\SOFTWARE\WinFsp (or HKLM\SOFTWARE\WOW6432Node\WinFsp on a 64-bit system) called DistinctPermsForSameOwnerGroup, which if set to 1 will direct WinFsp-FUSE to use the new behavior. The default value is 0 which directs WinFsp-FUSE to use the old behavior. This default will change in a future release.

• [FIX] File share access when overwriting a file (e.g. when using TRUNCATE_EXISTING) is now done in a manner compatible with NTFS (previously there were cases when overwriting a file where behavior diverged from the NTFS one). (See GitHub issue #364.)

• [FIX] Fixed a problem in the file system shutdown protocol which resolves an occasional access violation in the user mode file system process. Previously it was possible for a file system to crash when stopping itself using FspFileSystemStopDispatcher; this problem has been rectified. (See GitHub issue #369.)

• [FIX] The winfsp.h header no longer defines FILE_FULL_EA_INFORMATION when compiled under mingw. This is because the mingw tool chain already includes a definition of this type. (GitHub PR #371. Thanks @lemourin.)