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This is derived from swills@ fork of the Juniper virtfs with many changes by me including bug fixes, style improvements, clearer layering and more consistent logging. The filesystem is renamed to p9fs to better reflect its function and to prevent possible future confusion with virtio-fs. Several updates and fixes from Juniper have been integrated into this version by Val Packett and these contributions along with the original Juniper authors are credited below. To use this with bhyve, add 'virtio_p9fs_load=YES' to loader.conf. The bhyve virtio-9p device allows access from the guest to files on the host by mapping a 'sharename' to a host path. It is possible to use p9fs as a root filesystem by adding this to /boot/loader.conf: vfs.root.mountfrom="p9fs:sharename" for non-root filesystems add something like this to /etc/fstab: sharename /mnt p9fs rw 0 0 In both examples, substitute the share name used on the bhyve command line. The 9P filesystem protocol relies on stateful file opens which map protocol-level FIDs to host file descriptors. The FreeBSD vnode interface doesn't really support this and we use heuristics to guess the right FID to use for file operations. This can be confused by privilege lowering and does not guarantee that the FID created for a given file open is always used for file operations, even if the calling process is using the file descriptor from the original open call. Improving this would involve changes to the vnode interface which is out-of-scope for this import. Differential Revision: https://reviews.freebsd.org/D41844 Reviewed by: kib, emaste, dch MFC after: 3 months Co-authored-by: Val Packett <val@packett.cool> Co-authored-by: Ka Ho Ng <kahon@juniper.net> Co-authored-by: joyu <joyul@juniper.net> Co-authored-by: Kumara Babu Narayanaswamy <bkumara@juniper.net>
71 lines
2.1 KiB
C
71 lines
2.1 KiB
C
/*-
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* Copyright (c) 2022-present Doug Rabson
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* All rights reserved.
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*
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* Redistribution and use in source and binary forms, with or without
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* modification, are permitted provided that the following conditions
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* are met:
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* 1. Redistributions of source code must retain the above copyright
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* notice, this list of conditions and the following disclaimer.
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* 2. Redistributions in binary form must reproduce the above copyright
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* notice, this list of conditions and the following disclaimer in the
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* documentation and/or other materials provided with the distribution.
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*
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* THIS SOFTWARE IS PROVIDED BY THE AUTHOR AND CONTRIBUTORS ``AS IS'' AND
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* ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
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* IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
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* ARE DISCLAIMED. IN NO EVENT SHALL THE AUTHOR OR CONTRIBUTORS BE LIABLE
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* FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL
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* DAMAGES (INCLUDING, BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS
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* OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION)
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* HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT
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* LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY
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* OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
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* SUCH DAMAGE.
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*/
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#include <sys/param.h>
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#include <sys/kernel.h>
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#include <sys/kassert.h>
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#include <sys/libkern.h>
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#include <fs/p9fs/p9_transport.h>
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TAILQ_HEAD(, p9_trans_module) transports;
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static void
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p9_transport_init(void)
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{
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TAILQ_INIT(&transports);
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}
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SYSINIT(p9_transport, SI_SUB_DRIVERS, SI_ORDER_FIRST, p9_transport_init, NULL);
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void
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p9_register_trans(struct p9_trans_module *m)
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{
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TAILQ_INSERT_TAIL(&transports, m, link);
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}
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void
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p9_unregister_trans(struct p9_trans_module *m)
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{
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TAILQ_REMOVE(&transports, m, link);
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}
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struct p9_trans_module *
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p9_get_trans_by_name(char *name)
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{
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struct p9_trans_module *m;
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TAILQ_FOREACH(m, &transports, link) {
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if (strcmp(m->name, name) == 0)
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return (m);
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}
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return (NULL);
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}
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