Edward Tomasz Napierala 4ddb3cc597 devfs(4): defer freeing until we drop devmtx ("cdev") ... Before r332974 the old code would sometimes cause a rare lock order reversal against pagequeue, which looked roughly like this: witness_checkorder() __mtx_lock-flags() vm_page_alloc() uma_small_alloc() keg_alloc_slab() keg_fetch-slab() zone_fetch-slab() zone_import() zone_alloc_bucket() uma_zalloc_arg() bucket_alloc() uma_zfree_arg() free() devfs_metoo() devfs_populate_loop() devfs_populate() devfs_rioctl() VOP_IOCTL_APV() VOP_IOCTL() vn_ioctl() fo_ioctl() kern_ioctl() sys_ioctl() Since r332974 the original problem no longer exists, but it still makes sense to move things out of the - often congested - lock. Reviewed By: kib, markj Sponsored by: NetApp, Inc. Sponsored by: Klara, Inc. Differential Revision: https://reviews.freebsd.org/D27334		2020-12-29 13:47:36 +00:00
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devfs_devs.c	devfs(4): defer freeing until we drop devmtx ("cdev")	2020-12-29 13:47:36 +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	devfs: Abstract locking assertions	2020-08-12 00:32:31 +00:00
devfs_rule.c
devfs_vfsops.c	vfs: drop the mostly unused flags argument from VOP_UNLOCK	2020-01-03 22:29:58 +00:00
devfs_vnops.c	devfs: rework si_usecount to track opens	2020-08-11 14:27:57 +00:00
devfs.h	devfs: rework si_usecount to track opens	2020-08-11 14:27:57 +00:00