sync with OpenBSD -current
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8f3269c13c
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F42C07F07E2E35B7
4 changed files with 122 additions and 59 deletions
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@ -1,4 +1,4 @@
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/* $OpenBSD: fuse_device.c,v 1.39 2023/09/08 20:00:28 mvs Exp $ */
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/* $OpenBSD: fuse_device.c,v 1.40 2023/12/16 22:17:08 mvs Exp $ */
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/*
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* Copyright (c) 2012-2013 Sylvestre Gallon <ccna.syl@gmail.com>
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*
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@ -19,13 +19,14 @@
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#include <sys/systm.h>
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#include <sys/fcntl.h>
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#include <sys/ioctl.h>
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#include <sys/event.h>
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#include <sys/malloc.h>
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#include <sys/mount.h>
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#include <sys/rwlock.h>
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#include <sys/stat.h>
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#include <sys/statvfs.h>
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#include <sys/vnode.h>
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#include <sys/fusebuf.h>
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#include <sys/selinfo.h>
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#include "fusefs_node.h"
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#include "fusefs.h"
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@ -36,18 +37,24 @@
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#define DPRINTF(fmt, arg...)
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#endif
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/*
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* Locks used to protect struct members and global data
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* l fd_lock
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*/
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SIMPLEQ_HEAD(fusebuf_head, fusebuf);
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struct fuse_d {
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struct rwlock fd_lock;
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struct fusefs_mnt *fd_fmp;
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int fd_unit;
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/*fusebufs queues*/
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struct fusebuf_head fd_fbufs_in;
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struct fusebuf_head fd_fbufs_in; /* [l] */
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struct fusebuf_head fd_fbufs_wait;
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/* kq fields */
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struct selinfo fd_rsel;
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struct klist fd_rklist; /* [l] */
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LIST_ENTRY(fuse_d) fd_list;
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};
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@ -67,12 +74,16 @@ int fusewrite(dev_t, struct uio *, int);
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int fusekqfilter(dev_t dev, struct knote *kn);
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int filt_fuse_read(struct knote *, long);
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void filt_fuse_rdetach(struct knote *);
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int filt_fuse_modify(struct kevent *, struct knote *);
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int filt_fuse_process(struct knote *, struct kevent *);
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static const struct filterops fuse_rd_filtops = {
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.f_flags = FILTEROP_ISFD,
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.f_flags = FILTEROP_ISFD | FILTEROP_MPSAFE,
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.f_attach = NULL,
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.f_detach = filt_fuse_rdetach,
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.f_event = filt_fuse_read,
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.f_modify = filt_fuse_modify,
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.f_process = filt_fuse_process,
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};
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#ifdef FUSE_DEBUG
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@ -142,6 +153,7 @@ fuse_device_cleanup(dev_t dev)
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/* clear FIFO IN */
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lprev = NULL;
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rw_enter_write(&fd->fd_lock);
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SIMPLEQ_FOREACH_SAFE(f, &fd->fd_fbufs_in, fb_next, ftmp) {
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DPRINTF("cleanup unprocessed msg in sc_fbufs_in\n");
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if (lprev == NULL)
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@ -155,6 +167,7 @@ fuse_device_cleanup(dev_t dev)
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wakeup(f);
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lprev = f;
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}
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rw_exit_write(&fd->fd_lock);
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/* clear FIFO WAIT*/
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lprev = NULL;
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@ -182,9 +195,11 @@ fuse_device_queue_fbuf(dev_t dev, struct fusebuf *fbuf)
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if (fd == NULL)
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return;
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rw_enter_write(&fd->fd_lock);
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SIMPLEQ_INSERT_TAIL(&fd->fd_fbufs_in, fbuf, fb_next);
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knote_locked(&fd->fd_rklist, 0);
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rw_exit_write(&fd->fd_lock);
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stat_fbufs_in++;
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selwakeup(&fd->fd_rsel);
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}
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void
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@ -221,6 +236,9 @@ fuseopen(dev_t dev, int flags, int fmt, struct proc * p)
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fd->fd_unit = unit;
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SIMPLEQ_INIT(&fd->fd_fbufs_in);
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SIMPLEQ_INIT(&fd->fd_fbufs_wait);
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rw_init(&fd->fd_lock, "fusedlk");
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klist_init_rwlock(&fd->fd_rklist, &fd->fd_lock);
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LIST_INSERT_HEAD(&fuse_d_list, fd, fd_list);
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stat_opened_fusedev++;
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@ -278,6 +296,7 @@ fuseioctl(dev_t dev, u_long cmd, caddr_t addr, int flags, struct proc *p)
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ioexch = (struct fb_ioctl_xch *)addr;
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/* Looking for uuid in fd_fbufs_in */
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rw_enter_write(&fd->fd_lock);
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SIMPLEQ_FOREACH(fbuf, &fd->fd_fbufs_in, fb_next) {
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if (fbuf->fb_uuid == ioexch->fbxch_uuid)
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break;
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@ -285,6 +304,7 @@ fuseioctl(dev_t dev, u_long cmd, caddr_t addr, int flags, struct proc *p)
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lastfbuf = fbuf;
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}
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if (fbuf == NULL) {
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rw_exit_write(&fd->fd_lock);
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printf("fuse: Cannot find fusebuf\n");
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return (EINVAL);
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}
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@ -295,6 +315,8 @@ fuseioctl(dev_t dev, u_long cmd, caddr_t addr, int flags, struct proc *p)
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else
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SIMPLEQ_REMOVE_AFTER(&fd->fd_fbufs_in, lastfbuf,
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fb_next);
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rw_exit_write(&fd->fd_lock);
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stat_fbufs_in--;
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/* Do not handle fbufs with bad len */
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@ -385,22 +407,23 @@ fuseread(dev_t dev, struct uio *uio, int ioflag)
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void *tmpaddr;
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int error = 0;
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/* We get the whole fusebuf or nothing */
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if (uio->uio_resid != FUSEBUFSIZE)
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return (EINVAL);
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fd = fuse_lookup(minor(dev));
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if (fd == NULL)
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return (ENXIO);
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rw_enter_write(&fd->fd_lock);
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if (SIMPLEQ_EMPTY(&fd->fd_fbufs_in)) {
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if (ioflag & O_NONBLOCK)
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return (EAGAIN);
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error = EAGAIN;
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goto end;
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}
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fbuf = SIMPLEQ_FIRST(&fd->fd_fbufs_in);
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/* We get the whole fusebuf or nothing */
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if (uio->uio_resid != FUSEBUFSIZE)
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return (EINVAL);
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/* Do not send kernel pointers */
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memcpy(&hdr.fh_next, &fbuf->fb_next, sizeof(fbuf->fb_next));
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memset(&fbuf->fb_next, 0, sizeof(fbuf->fb_next));
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@ -426,6 +449,7 @@ fuseread(dev_t dev, struct uio *uio, int ioflag)
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}
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end:
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rw_exit_write(&fd->fd_lock);
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return (error);
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}
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@ -519,7 +543,7 @@ fusekqfilter(dev_t dev, struct knote *kn)
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switch (kn->kn_filter) {
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case EVFILT_READ:
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klist = &fd->fd_rsel.si_note;
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klist = &fd->fd_rklist;
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kn->kn_fop = &fuse_rd_filtops;
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break;
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case EVFILT_WRITE:
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@ -530,7 +554,7 @@ fusekqfilter(dev_t dev, struct knote *kn)
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kn->kn_hook = fd;
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klist_insert_locked(klist, kn);
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klist_insert(klist, kn);
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return (0);
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}
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@ -539,9 +563,9 @@ void
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filt_fuse_rdetach(struct knote *kn)
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{
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struct fuse_d *fd = kn->kn_hook;
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struct klist *klist = &fd->fd_rsel.si_note;
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struct klist *klist = &fd->fd_rklist;
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klist_remove_locked(klist, kn);
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klist_remove(klist, kn);
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}
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int
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@ -550,8 +574,36 @@ filt_fuse_read(struct knote *kn, long hint)
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struct fuse_d *fd = kn->kn_hook;
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int event = 0;
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rw_assert_wrlock(&fd->fd_lock);
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if (!SIMPLEQ_EMPTY(&fd->fd_fbufs_in))
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event = 1;
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return (event);
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}
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int
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filt_fuse_modify(struct kevent *kev, struct knote *kn)
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{
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struct fuse_d *fd = kn->kn_hook;
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int active;
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rw_enter_write(&fd->fd_lock);
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active = knote_modify(kev, kn);
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rw_exit_write(&fd->fd_lock);
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return (active);
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}
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int
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filt_fuse_process(struct knote *kn, struct kevent *kev)
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{
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struct fuse_d *fd = kn->kn_hook;
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int active;
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rw_enter_write(&fd->fd_lock);
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active = knote_process(kn, kev);
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rw_exit_write(&fd->fd_lock);
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return (active);
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}
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