Date: Sun, 14 Nov 2004 00:28:05 +0100 From: "Poul-Henning Kamp" <phk@phk.freebsd.dk> To: current@freebsd.org Subject: [TEST] device and fifo vnode bypass, Giantfree select/poll Message-ID: <38192.1100388485@critter.freebsd.dk>
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This solves the problem seen in the device vnode bypass mode (vfs.devfs.fops=1), typically with a message like: panic: specread() on un-referenced struct cdev *(ttyp1) Please try setting vfs.devfs.fops=1 in loader.conf again and beat up the code even harder. I have code in p4:phk_bufwork which does vnode bypass for FIFOs and Giant free select(2)/poll(2) for networking. If you have perforce access, please help beat up on this code. Poul-Henning In message <200411132321.iADNLsZN032634@repoman.freebsd.org>, Poul-Henning Kamp writes: >phk 2004-11-13 23:21:54 UTC > > FreeBSD src repository > > Modified files: > sys/fs/devfs devfs_vnops.c > Log: > Add the devfs_fp_check() function which helps us get from a struct file > to a cdev and a devsw, doing all the relevant checks along the way. > > Add the check to see if fp->f_vnode->v_rdev differs from our cached > fp->f_data copy of our cdev. If it does the device was revoked and > we return ENXIO. > > Revision Changes Path > 1.83 +34 -70 src/sys/fs/devfs/devfs_vnops.c > -- Poul-Henning Kamp | UNIX since Zilog Zeus 3.20 phk@FreeBSD.ORG | TCP/IP since RFC 956 FreeBSD committer | BSD since 4.3-tahoe Never attribute to malice what can adequately be explained by incompetence.
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