freebsd-dev/sys/fs/devfs
Konstantin Belousov 6470c8d3db Rework v_object lifecycle for vnodes.
Current implementation of vnode_create_vobject() and
vnode_destroy_vobject() is written so that it prepared to handle the
vm object destruction for live vnode.  Practically, no filesystems use
this, except for some remnants that were present in UFS till today.
One of the consequences of that model is that each filesystem must
call vnode_destroy_vobject() in VOP_RECLAIM() or earlier, as result
all of them get rid of the v_object in reclaim.

Move the call to vnode_destroy_vobject() to vgonel() before
VOP_RECLAIM().  This makes v_object stable: either the object is NULL,
or it is valid vm object till the vnode reclamation.  Remove code from
vnode_create_vobject() to handle races with the parallel destruction.

Reviewed by:	markj
Tested by:	pho
Sponsored by:	The FreeBSD Foundation
Differential revision:	https://reviews.freebsd.org/D21412
2019-08-29 07:50:25 +00:00
..
devfs_devs.c Ensure that directory entry padding bytes are zeroed. 2018-11-23 22:24:59 +00:00
devfs_dir.c r326394 is calling malloc with M_WAITOK under a lock, revert for now 2017-11-30 14:06:54 +00:00
devfs_int.h sys/fs: further adoption of SPDX licensing ID tags. 2017-11-27 15:15:37 +00:00
devfs_rule.c sys/fs: further adoption of SPDX licensing ID tags. 2017-11-27 15:15:37 +00:00
devfs_vfsops.c Make it easier for filesystems to count themselves as jail-enabled, 2018-05-04 20:54:27 +00:00
devfs_vnops.c Rework v_object lifecycle for vnodes. 2019-08-29 07:50:25 +00:00
devfs.h sys/fs: further adoption of SPDX licensing ID tags. 2017-11-27 15:15:37 +00:00