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2020-01-23virtiofsd: passthrough_ll: clean up cache related optionsMiklos Szeredi
- Rename "cache=never" to "cache=none" to match 9p's similar option. - Rename CACHE_NORMAL constant to CACHE_AUTO to match the "cache=auto" option. Signed-off-by: Miklos Szeredi <mszeredi@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23virtiofsd: extract root inode init into setup_root()Miklos Szeredi
Inititialize the root inode in a single place. Signed-off-by: Miklos Szeredi <mszeredi@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> dgilbert: with fix suggested by Misono Tomohiro <misono.tomohiro@jp.fujitsu.com> Reviewed-by: Misono Tomohiro <misono.tomohiro@jp.fujitsu.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23virtiofsd: fail when parent inode isn't known in lo_do_lookup()Miklos Szeredi
The Linux file handle APIs (struct export_operations) can access inodes that are not attached to parents because path name traversal is not performed. Refuse if there is no parent in lo_do_lookup(). Also clean up lo_do_lookup() while we're here. Signed-off-by: Miklos Szeredi <mszeredi@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Misono Tomohiro <misono.tomohiro@jp.fujitsu.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23virtiofsd: rename unref_inode() to unref_inode_lolocked()Miklos Szeredi
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23virtiofsd: passthrough_ll: control readdirplusMiklos Szeredi
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com> Reviewed-by: Misono Tomohiro <misono.tomohiro@jp.fujitsu.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23virtiofsd: passthrough_ll: disable readdirplus on cache=neverMiklos Szeredi
...because the attributes sent in the READDIRPLUS reply would be discarded anyway. Signed-off-by: Miklos Szeredi <mszeredi@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23virtiofsd: passthrough_ll: add renameat2 supportMiklos Szeredi
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23contrib/libvhost-user: Protect slave fd with mutexDr. David Alan Gilbert
In future patches we'll be performing commands on the slave-fd driven by commands on queues, since those queues will be driven by individual threads we need to make sure they don't attempt to use the slave-fd for multiple commands in parallel. Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23vhost-user: Print unexpected slave message typesDr. David Alan Gilbert
When we receive an unexpected message type on the slave fd, print the type. Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23virtiofsd: Kill threads when queues are stoppedDr. David Alan Gilbert
Kill the threads we've started when the queues get stopped. Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> With improvements by: Signed-off-by: Eryu Guan <eguan@linux.alibaba.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23virtiofsd: Handle hard rebootDr. David Alan Gilbert
Handle a mount hard reboot (without unmount) mount we get another 'init' which FUSE doesn't normally expect. Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23virtiofsd: Handle reinitDr. David Alan Gilbert
Allow init->destroy->init for mount->umount->mount Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23virtiofsd: Add timestamp to the log with FUSE_LOG_DEBUG levelMasayoshi Mizuma
virtiofsd has some threads, so we see a lot of logs with debug option. It would be useful for debugging if we can see the timestamp. Add nano second timestamp, which got by get_clock(), to the log with FUSE_LOG_DEBUG level if the syslog option isn't set. The log is like as: # ./virtiofsd -d -o vhost_user_socket=/tmp/vhostqemu0 -o source=/tmp/share0 -o cache=auto ... [5365943125463727] [ID: 00000002] fv_queue_thread: Start for queue 0 kick_fd 9 [5365943125568644] [ID: 00000002] fv_queue_thread: Waiting for Queue 0 event [5365943125573561] [ID: 00000002] fv_queue_thread: Got queue event on Queue 0 Signed-off-by: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23virtiofsd: Add ID to the log with FUSE_LOG_DEBUG levelMasayoshi Mizuma
virtiofsd has some threads, so we see a lot of logs with debug option. It would be useful for debugging if we can identify the specific thread from the log. Add ID, which is got by gettid(), to the log with FUSE_LOG_DEBUG level so that we can grep the specific thread. The log is like as: ]# ./virtiofsd -d -o vhost_user_socket=/tmp/vhostqemu0 -o source=/tmp/share0 -o cache=auto ... [ID: 00000097] unique: 12696, success, outsize: 120 [ID: 00000097] virtio_send_msg: elem 18: with 2 in desc of length 120 [ID: 00000003] fv_queue_thread: Got queue event on Queue 1 [ID: 00000003] fv_queue_thread: Queue 1 gave evalue: 1 available: in: 65552 out: 80 [ID: 00000003] fv_queue_thread: Waiting for Queue 1 event [ID: 00000071] fv_queue_worker: elem 33: with 2 out desc of length 80 bad_in_num=0 bad_out_num=0 [ID: 00000071] unique: 12694, opcode: READ (15), nodeid: 2, insize: 80, pid: 2014 [ID: 00000071] lo_read(ino=2, size=65536, off=131072) Signed-off-by: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> added rework as suggested by Daniel P. Berrangé during review Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23virtiofsd: print log only when priority is high enoughEryu Guan
Introduce "-o log_level=" command line option to specify current log level (priority), valid values are "debug info warn err", e.g. ./virtiofsd -o log_level=debug ... So only log priority higher than "debug" will be printed to stderr/syslog. And the default level is info. The "-o debug"/"-d" options are kept, and imply debug log level. Signed-off-by: Eryu Guan <eguan@linux.alibaba.com> dgilbert: Reworked for libfuse's log_func Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> with fix by: Signed-off-by: Xiao Yang <yangx.jy@cn.fujitsu.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23virtiofsd: add --syslog command-line optionStefan Hajnoczi
Sometimes collecting output from stderr is inconvenient or does not fit within the overall logging architecture. Add syslog(3) support for cases where stderr cannot be used. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> dgilbert: Reworked as a logging function Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23virtiofsd: fix libfuse information leaksStefan Hajnoczi
Some FUSE message replies contain padding fields that are not initialized by libfuse. This is fine in traditional FUSE applications because the kernel is trusted. virtiofsd does not trust the guest and must not expose uninitialized memory. Use C struct initializers to automatically zero out memory. Not all of these code changes are strictly necessary but they will prevent future information leaks if the structs are extended. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23virtiofsd: set maximum RLIMIT_NOFILE limitStefan Hajnoczi
virtiofsd can exceed the default open file descriptor limit easily on most systems. Take advantage of the fact that it runs as root to raise the limit. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23virtiofsd: Drop CAP_FSETID if client asked for itVivek Goyal
If client requested killing setuid/setgid bits on file being written, drop CAP_FSETID capability so that setuid/setgid bits are cleared upon write automatically. pjdfstest chown/12.t needs this. Signed-off-by: Vivek Goyal <vgoyal@redhat.com> dgilbert: reworked for libcap-ng Reviewed-by: Misono Tomohiro <misono.tomohiro@jp.fujitsu.com> Reviewed-by: Sergio Lopez <slp@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23virtiofsd: cap-ng helpersDr. David Alan Gilbert
libcap-ng reads /proc during capng_get_caps_process, and virtiofsd's sandboxing doesn't have /proc mounted; thus we have to do the caps read before we sandbox it and save/restore the state. Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23virtiofsd: Parse flag FUSE_WRITE_KILL_PRIVVivek Goyal
Caller can set FUSE_WRITE_KILL_PRIV in write_flags. Parse it and pass it to the filesystem. Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Reviewed-by: Misono Tomohiro <misono.tomohiro@jp.fujitsu.com> Reviewed-by: Sergio Lopez <slp@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23virtiofsd: add seccomp whitelistStefan Hajnoczi
Only allow system calls that are needed by virtiofsd. All other system calls cause SIGSYS to be directed at the thread and the process will coredump. Restricting system calls reduces the kernel attack surface and limits what the process can do when compromised. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> with additional entries by: Signed-off-by: Ganesh Maharaj Mahalingam <ganesh.mahalingam@intel.com> Signed-off-by: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com> Signed-off-by: Misono Tomohiro <misono.tomohiro@jp.fujitsu.com> Signed-off-by: piaojun <piaojun@huawei.com> Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Eric Ren <renzhen@linux.alibaba.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23virtiofsd: move to a new pid namespaceStefan Hajnoczi
virtiofsd needs access to /proc/self/fd. Let's move to a new pid namespace so that a compromised process cannot see another other processes running on the system. One wrinkle in this approach: unshare(CLONE_NEWPID) affects *child* processes and not the current process. Therefore we need to fork the pid 1 process that will actually run virtiofsd and leave a parent in waitpid(2). This is not the same thing as daemonization and parent processes should not notice a difference. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23virtiofsd: move to an empty network namespaceStefan Hajnoczi
If the process is compromised there should be no network access. Use an empty network namespace to sandbox networking. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23virtiofsd: sandbox mount namespaceStefan Hajnoczi
Use a mount namespace with the shared directory tree mounted at "/" and no other mounts. This prevents symlink escape attacks because symlink targets are resolved only against the shared directory and cannot go outside it. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Peng Tao <tao.peng@linux.alibaba.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23virtiofsd: use /proc/self/fd/ O_PATH file descriptorStefan Hajnoczi
Sandboxing will remove /proc from the mount namespace so we can no longer build string paths into "/proc/self/fd/...". Keep an O_PATH file descriptor so we can still re-open fds via /proc/self/fd. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23virtiofsd: prevent ".." escape in lo_do_readdir()Stefan Hajnoczi
Construct a fake dirent for the root directory's ".." entry. This hides the parent directory from the FUSE client. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Sergio Lopez <slp@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23virtiofsd: prevent ".." escape in lo_do_lookup()Stefan Hajnoczi
Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Sergio Lopez <slp@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23virtiofsd: check input buffer size in fuse_lowlevel.c opsStefan Hajnoczi
Each FUSE operation involves parsing the input buffer. Currently the code assumes the input buffer is large enough for the expected arguments. This patch uses fuse_mbuf_iter to check the size. Most operations are simple to convert. Some are more complicated due to variable-length inputs or different sizes depending on the protocol version. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Sergio Lopez <slp@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23virtiofsd: validate input buffer sizes in do_write_buf()Stefan Hajnoczi
There is a small change in behavior: if fuse_write_in->size doesn't match the input buffer size then the request is failed. Previously write requests with 1 fuse_buf element would truncate to fuse_write_in->size. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Sergio Lopez <slp@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23virtiofsd: add fuse_mbuf_iter APIStefan Hajnoczi
Introduce an API for consuming bytes from a buffer with size checks. All FUSE operations will be converted to use this safe API instead of void *inarg. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23virtiofsd: Pass write iov's all the way throughDr. David Alan Gilbert
Pass the write iov pointing to guest RAM all the way through rather than copying the data. Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: Xiao Yang <yangx.jy@cn.fujitsu.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23virtiofsd: Plumb fuse_bufvec through to do_write_bufDr. David Alan Gilbert
Let fuse_session_process_buf_int take a fuse_bufvec * instead of a fuse_buf; and then through to do_write_buf - where in the best case it can pass that straight through to op.write_buf without copying (other than skipping a header). Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23virtiofsd: validate path componentsStefan Hajnoczi
Several FUSE requests contain single path components. A correct FUSE client sends well-formed path components but there is currently no input validation in case something went wrong or the client is malicious. Refuse ".", "..", and paths containing '/' when we expect a path component. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23virtiofsd: passthrough_ll: add fallback for racy opsMiklos Szeredi
We have two operations that cannot be done race-free on a symlink in certain cases: utimes and link. Add racy fallback for these if the race-free method doesn't work. We do our best to avoid races even in this case: - get absolute path by reading /proc/self/fd/NN symlink - lookup parent directory: after this we are safe against renames in ancestors - lookup name in parent directory, and verify that we got to the original inode, if not retry the whole thing Both utimes(2) and link(2) hold i_lock on the inode across the operation, so a racing rename/delete by this fuse instance is not possible, only from other entities changing the filesystem. If the "norace" option is given, then disable the racy fallbacks. Signed-off-by: Miklos Szeredi <mszeredi@redhat.com> Reviewed-by: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23virtiofsd: passthrough_ll: add fd_map to hide file descriptorsStefan Hajnoczi
Do not expose file descriptor numbers to clients. This prevents the abuse of internal file descriptors (like stdin/stdout). Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Fix from: Signed-off-by: Xiao Yang <yangx.jy@cn.fujitsu.com> dgilbert: Added lseek Reviewed-by: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23virtiofsd: passthrough_ll: add dirp_map to hide lo_dirp pointersStefan Hajnoczi
Do not expose lo_dirp pointers to clients. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23virtiofsd: passthrough_ll: add ino_map to hide lo_inode pointersStefan Hajnoczi
Do not expose lo_inode pointers to clients. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23virtiofsd: passthrough_ll: add lo_map for ino/fh indirectionStefan Hajnoczi
A layer of indirection is needed because passthrough_ll cannot expose pointers or file descriptor numbers to untrusted clients. Malicious clients could send invalid pointers or file descriptors in order to crash or exploit the file system daemon. lo_map provides an integer key->value mapping. This will be used for ino and fh fields in the patches that follow. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23virtiofsd: passthrough_ll: create new files in caller's contextVivek Goyal
We need to create files in the caller's context. Otherwise after creating a file, the caller might not be able to do file operations on that file. Changed effective uid/gid to caller's uid/gid, create file and then switch back to uid/gid 0. Use syscall(setresuid, ...) otherwise glibc does some magic to change EUID in all threads, which is not what we want. Signed-off-by: Vivek Goyal <vgoyal@redhat.com> Signed-off-by: Miklos Szeredi <mszeredi@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23virtiofs: Add maintainers entryDr. David Alan Gilbert
Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Reviewed-by: Philippe Mathieu-Daudé <philmd@redhat.com> Tested-by: Philippe Mathieu-Daudé <philmd@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23virtiofsd: add --print-capabilities optionStefan Hajnoczi
Add the --print-capabilities option as per vhost-user.rst "Backend programs conventions". Currently there are no advertised features. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23virtiofsd: add vhost-user.json fileStefan Hajnoczi
Install a vhost-user.json file describing virtiofsd. This allows libvirt and other management tools to enumerate vhost-user backend programs. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23virtiofsd: make -f (foreground) the defaultStefan Hajnoczi
According to vhost-user.rst "Backend program conventions", backend programs should run in the foregound by default. Follow the conventions so libvirt and other management tools can control virtiofsd in a standard way. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23virtiofsd: add --fd=FDNUM fd passing optionStefan Hajnoczi
Although --socket-path=PATH is useful for manual invocations, management tools typically create the UNIX domain socket themselves and pass it to the vhost-user device backend. This way QEMU can be launched immediately with a valid socket. No waiting for the vhost-user device backend is required when fd passing is used. Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23virtiofsd: Fast path for virtio readDr. David Alan Gilbert
Readv the data straight into the guests buffer. Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> With fix by: Signed-off-by: Eryu Guan <eguan@linux.alibaba.com> Reviewed-by: Masayoshi Mizuma <m.mizuma@jp.fujitsu.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23virtiofsd: Add Makefile wiring for virtiofsd contribDr. David Alan Gilbert
Wire up the building of the virtiofsd in tools. virtiofsd relies on Linux-specific system calls and seccomp. Anyone wishing to port it to other host operating systems should do so carefully and without reducing security. Only allow building on Linux hosts. Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Signed-off-by: Stefan Hajnoczi <stefanha@redhat.com> Reviewed-by: Liam Merwick <liam.merwick@oracle.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23virtiofsd: Keep track of repliesDr. David Alan Gilbert
Keep track of whether we sent a reply to a request; this is a bit paranoid but it means: a) We should always recycle an element even if there was an error in the request b) Never try and send two replies on one queue element Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23virtiofsd: Send replies to messagesDr. David Alan Gilbert
Route fuse out messages back through the same queue elements that had the command that triggered the request. Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
2020-01-23virtiofsd: Start reading commands from queueDr. David Alan Gilbert
Pop queue elements off queues, copy the data from them and pass that to fuse. Note: 'out' in a VuVirtqElement is from QEMU 'in' in libfuse is into the daemon So we read from the out iov's to get a fuse_in_header When we get a kick we've got to read all the elements until the queue is empty. Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com> Reviewed-by: Daniel P. Berrangé <berrange@redhat.com> Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>
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