Date: Thu, 07 Mar 2019 23:17:27 +0000 From: bugzilla-noreply@freebsd.org To: bugs@FreeBSD.org Subject: [Bug 236378] [FUSE] fuse must set FUSE_WRITE_CACHE when writing from the page cache Message-ID: <bug-236378-227@https.bugs.freebsd.org/bugzilla/>
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https://bugs.freebsd.org/bugzilla/show_bug.cgi?id=236378 Bug ID: 236378 Summary: [FUSE] fuse must set FUSE_WRITE_CACHE when writing from the page cache Product: Base System Version: CURRENT Hardware: Any OS: Any Status: New Severity: Affects Many People Priority: --- Component: kern Assignee: bugs@FreeBSD.org Reporter: asomers@FreeBSD.org FUSE operations all record the pid, uid, and gid of the requesting process. Many FUSE filesystem daemons use that to authenticate accesses. Ideally, they would only do it on FUSE_OPEN. But may daemons are internally stateless, which requires them to authenticate operations on every operation, including FUSE_WRITE. However, writes that come from the page cache (such as when a fuse-backed file is mmap()ed or when using the writeback caching strategy introduced in protocol 7.23) cannot set these fields correctly, because multiple processes may have written to the same file. For such cases, FUSE_WRITE defines the FUSE_WRITE_CACHE flag, which indicates to the filesystem daemon that these fields are not valid. fuse(4) must set this flag when issueing writes from the cache. -- You are receiving this mail because: You are the assignee for the bug.home | help
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