FUSE file systems can optionally support interrupting outstanding
operations. However, the file system does not identify to the kernel at
mount time whether it's capable of doing that. Instead it signals its
noncapability by returning ENOSYS to the first FUSE_INTERRUPT operation it
receives. That's a problem for reliable signal delivery, because the kernel
must choose which thread should get a signal before it knows whether the
FUSE server can handle interrupts. The problem is even worse because the
FUSE protocol allows a file system to simply ignore all FUSE_INTERRUPT
operations.
Fix the signal delivery logic by making interruptibility an opt-in mount
option. This will require a corresponding change to libfuse, but not to
most file systems that link to libfuse.
Bump __FreeBSD_version due to the new mount option.
Sponsored by: The FreeBSD Foundation
If a server supports a timestamp granularity other than 1ns, it can tell the
client this as of protocol 7.23. The client will use that granularity when
updating its cached timestamps during write. This way the timestamps won't
appear to change following flush.
Sponsored by: The FreeBSD Foundation
If the fuse daemon supports FUSE_BMAP, then use that for the block mapping.
Otherwise, use the same technique used by vop_stdbmap. Report large values
for runp and runb in order to maximize read clustering and minimize upcalls,
even if we don't know the true layout.
The major result of this change is that sequential reads to FUSE files will
now usually happen 128KB at a time instead of 64KB.
Sponsored by: The FreeBSD Foundation
fusefs will now use cluster_read. This allows readahead of more than one
cache block. However, it won't yet actually cluster the reads because that
requires VOP_BMAP, which fusefs does not yet implement.
Sponsored by: The FreeBSD Foundation
Enable write clustering in fusefs whenever cache mode is set to writeback
and the "async" mount option is used. With default values for MAXPHYS,
DFLTPHYS, and the fuse max_write mount parameter, that means sequential
writes will now be written 128KB at a time instead of 64KB.
Also, add a regression test for PR 238565, a panic during unmount that
probably affects UFS, ext2, and msdosfs as well as fusefs.
PR: 238565
Sponsored by: The FreeBSD Foundation
These fields are supposed to contain the file descriptor flags as supplied
to open(2) or set by fcntl(2). The feature is kindof useless on FreeBSD
since we don't supply all of these flags to fuse (because of the weak
relationship between struct file and struct vnode). But we should at least
set the access mode flags (O_RDONLY, etc).
This is the last fusefs change needed to get full protocol 7.9 support.
There are still a few options we don't support for good reason (mandatory
file locking is dumb, flock support is broken in the protocol until 7.17,
etc), but there's nothing else to do at this protocol level.
Sponsored by: The FreeBSD Foundation
This bit tells the server that we're not sure which uid, gid, and/or pid
originated the write. I don't know of a single file system that cares, but
it's part of the protocol.
Sponsored by: The FreeBSD Foundation
* Prefer std::unique_ptr to raw pointers
* Prefer pass-by-reference to pass-by-pointer
* Prefer static_cast to C-style cast, unless it's too much typing
Reported by: ngie
Sponsored by: The FreeBSD Foundation
* Fix printf format strings on 32-bit OSes
* Fix -Wclass-memaccess violation on GCC-8 caused by using memset on an object
of non-trivial type.
* Fix memory leak in MockFS::init
* Fix -Wcast-align error on i386 in expect_readdir
* Fix some heterogenous comparison errors on 32-bit OSes.
Sponsored by: The FreeBSD Foundation
This commit adds the VOPs needed by userspace NFS servers (tested with
net/unfs3). More work is needed to make the in-kernel nfsd work, because of
its stateless nature. It doesn't open files prior to doing I/O. Also, the
NFS-related VOPs currently ignore the entry cache.
Sponsored by: The FreeBSD Foundation
This commit upgrades the FUSE API to protocol 7.9 and adds unit tests for
backwards compatibility with servers built for version 7.8. It doesn't
implement any of 7.9's new features yet.
Sponsored by: The FreeBSD Foundation
/dev/fuse was already pollable with poll and select. Add support for
kqueue, too. And add tests for polling with poll, select, and kqueue.
Sponsored by: The FreeBSD Foundation
When mounted with -o default_permissions fusefs is supposed to validate all
permissions in the kernel, not the file system. This commit fixes two
permissions that I had previously overlooked.
* Only root may chown a file
* Non-root users may only chgrp a file to a group to which they belong
PR: 216391
Sponsored by: The FreeBSD Foundation
* If a process receives a fatal signal while blocked on a fuse operation,
return ASAP without waiting for the operation to complete. But still send
the FUSE_INTERRUPT op to the daemon.
* Plug memory leaks from r346339
Interruptibility is now fully functional, but it could be better:
* Operations that haven't been sent to the server yet should be aborted
without sending FUSE_INTERRUPT.
* It would be great if write operations could be made restartable.
That would require delaying uiomove until the last possible moment, which
would be sometime during fuse_device_read.
* It would be nice if we didn't have to guess which EAGAIN responses were
for FUSE_INTERRUPT operations.
PR: 236530
Sponsored by: The FreeBSD Foundation
Normally all permission checking is done in the fuse server. But when -o
default_permissions is used, it should be done in the kernel instead. This
commit adds appropriate permission checks through fusefs when -o
default_permissions is used. However, sticky bit checks aren't working yet.
I'll handle those in a follow-up commit.
There are no checks for file flags, because those aren't supported by our
version of the FUSE protocol. Nor is there any support for ACLs, though
that could be added if there were any demand.
PR: 216391
Reported by: hiyorin@gmail.com
Sponsored by: The FreeBSD Foundation
FUSE_LOOKUP, FUSE_GETATTR, FUSE_SETATTR, FUSE_MKDIR, FUSE_LINK,
FUSE_SYMLINK, FUSE_MKNOD, and FUSE_CREATE all return file attributes with a
cache validity period. fusefs will now cache the attributes, if the server
returns a non-zero cache validity period.
This change does _not_ implement finite attr cache timeouts. That will
follow as part of PR 235773.
PR: 235775
Reported by: cem
Sponsored by: The FreeBSD Foundation
VOP_ACCESS was never fully implemented in fusefs. This change:
* Removes the FACCESS_DO_ACCESS flag, which pretty much disabled the whole
vop.
* Removes a quixotic special case for VEXEC on regular files. I don't know
why that was in there.
* Removes another confusing special case for VADMIN.
* Removes the FACCESS_NOCHECKSPY flag. It seemed to be a performance
optimization, but I'm unconvinced that it was a net positive.
* Updates test cases.
This change does NOT implement -o default_permissions. That will be handled
separately.
PR: 236291
Sponsored by: The FreeBSD Foundation
The original fusefs import, r238402, contained a bug in fuse_vnop_close that
could close a directory's file handle while there were still other open file
descriptors. The code looks deliberate, but there is no explanation for it.
This necessitated a workaround in fuse_vnop_readdir that would open a new
file handle if, "for some mysterious reason", that vnode didn't have any
open file handles. r345781 had the effect of causing the workaround to
panic, making the problem more visible.
This commit removes the workaround and the original bug, which also fixes
the panic.
Sponsored by: The FreeBSD Foundation
The FUSE protocol says that FUSE_FLUSH should be send every time a file
descriptor is closed. That's not quite possible in FreeBSD because multiple
file descriptors can share a single struct file, and closef doesn't call
fo_close until the last close. However, we can still send FUSE_FLUSH on
every VOP_CLOSE, which is probably good enough.
There are two purposes for FUSE_FLUSH. One is to allow file systems to
return EIO if they have an error when writing data that's cached
server-side. The other is to release POSIX file locks (which fusefs(5) does
not yet support).
PR: 236405, 236327
Sponsored by: The FreeBSD Foundation
O_EXEC is useful for fexecve(2) and fchdir(2). Treat it as another fufh
type alongside the existing RDONLY, WRONLY, and RDWR. Prior to r345742 this
would've caused a memory and performance penalty.
PR: 236329
Sponsored by: The FreeBSD Foundation
fuse_vnop_create must close the newly created file if it can't allocate a
vnode. When it does so, it must use the same file flags for FUSE_RELEASE as
it used for FUSE_OPEN or FUSE_CREATE.
Reported by: Coverity
Coverity CID: 1066204
Sponsored by: The FreeBSD Foundation
It's sufficient to check for /dev/fuse. And due to bug 236647, the module
could be named either fuse or fusefs.
PR: 236647
Sponsored by: The FreeBSD Foundation
Also, fix one of the default_permissions test cases. I forgot the
expectation for FUSE_ACCESS, because that doesn't work right now.
Sponsored by: The FreeBSD Foundation
