Date: Mon, 1 Jun 2009 21:32:52 +0000 (UTC) From: John Baldwin <jhb@FreeBSD.org> To: cvs-src-old@freebsd.org Subject: cvs commit: src/sys/kern kern_conf.c src/sys/sys conf.h src/sys/vm vm_mmap.c Message-ID: <200906012133.n51LXJ0g066499@repoman.freebsd.org>
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jhb 2009-06-01 21:32:52 UTC
FreeBSD src repository
Modified files:
sys/kern kern_conf.c
sys/sys conf.h
sys/vm vm_mmap.c
Log:
SVN rev 193275 on 2009-06-01 21:32:52Z by jhb
Add an extension to the character device interface that allows character
device drivers to use arbitrary VM objects to satisfy individual mmap()
requests.
- A new d_mmap_single(cdev, &foff, objsize, &object, prot) callback is
added to cdevsw. This function is called for each mmap() request.
If it returns ENODEV, then the mmap() request will fall back to using
the device's device pager object and d_mmap(). Otherwise, the method
can return a VM object to satisfy this entire mmap() request via
*object. It can also modify the starting offset into this object via
*foff. This allows device drivers to use the file offset as a cookie
to identify specific VM objects.
- vm_mmap_vnode() has been changed to call vm_mmap_cdev() directly when
mapping V_CHR vnodes. This avoids duplicating all the cdev mmap
handling code and simplifies some of vm_mmap_vnode().
- D_VERSION has been bumped to D_VERSION_02. Older device drivers
using D_VERSION_01 are still supported.
MFC after: 1 month
Revision Changes Path
1.231 +27 -2 src/sys/kern/kern_conf.c
1.250 +6 -2 src/sys/sys/conf.h
1.230 +47 -58 src/sys/vm/vm_mmap.c
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