Changed swap partition handling/allocation so that it doesn't
require specific partitions be mentioned in the kernel config
file ("swap on foo" is now obsolete).
From Poul-Henning:
The visible effect is this:
As default, unless
options "NSWAPDEV=23"
is in your config, you will have four swap-devices.
You can swapon(2) any block device you feel like, it doesn't have
to be in the kernel config.
There is a performance/resource win available by getting the NSWAPDEV right
(but only if you have just one swap-device ??), but using that as default
would be too restrictive.
The invisible effect is that:
Swap-handling disappears from the $arch part of the kernel.
It gets a lot simpler (-145 lines) and cleaner.
Reviewed by: John Dyson, David Greenman
Submitted by: Poul-Henning Kamp, with minor changes by me.
This commit is contained in:
David Greenman
parent
af9fe6e59d
commit
a401ebbe32
Notes:
svn2git
2020-12-20 02:59:44 +00:00
svn path=/head/; revision=8504
@ -34,7 +34,7 @@
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* SUCH DAMAGE.
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*
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* from: @(#)autoconf.c 7.1 (Berkeley) 5/9/91
|
||||
* $Id: autoconf.c,v 1.29 1995/05/11 19:26:07 rgrimes Exp $
|
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* $Id: autoconf.c,v 1.30 1995/05/12 19:17:11 wollman Exp $
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*/
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/*
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@ -57,7 +57,6 @@
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#include <machine/md_var.h>
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#include <machine/pte.h>
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static void swapconf(void);
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static void setroot(void);
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/*
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@ -209,43 +208,9 @@ configure()
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* parameter based on device(s) used.
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*/
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setconf();
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swapconf();
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cold = 0;
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}
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/*
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* Configure swap space and related parameters.
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*/
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static void
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swapconf()
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{
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register struct swdevt *swp;
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register int nblks;
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for (swp = swdevt; swp->sw_dev > 0; swp++)
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{
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unsigned d = major(swp->sw_dev);
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if (d > nblkdev) break;
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if (bdevsw[d].d_psize) {
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nblks = (*bdevsw[d].d_psize)(swp->sw_dev);
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if (nblks > 0 &&
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(swp->sw_nblks == 0 || swp->sw_nblks > nblks))
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swp->sw_nblks = nblks;
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else
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swp->sw_nblks = 0;
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}
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swp->sw_nblks = ctod(dtoc(swp->sw_nblks));
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}
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if (dumpdev != NODEV) {
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if (dumplo == 0 && bdevsw[major(dumpdev)].d_psize)
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dumplo = (*bdevsw[major(dumpdev)].d_psize)(dumpdev) -
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Maxmem*NBPG/512;
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if (dumplo < 0)
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dumplo = 0;
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}
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}
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int
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setdumpdev(dev_t dev)
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{
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@ -267,7 +232,6 @@ setdumpdev(dev_t dev)
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/*NOTREACHED*/
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}
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#define DOSWAP /* change swdevt and dumpdev */
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u_long bootdev = 0; /* should be dev_t, but not until 32 bits */
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static char devname[][2] = {
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@ -325,25 +289,4 @@ setroot()
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devname[majdev][0], devname[majdev][1],
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mindev >> (majdev == FDMAJOR ? FDUNITSHIFT : PARTITIONSHIFT),
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part + 'a');
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#ifdef DOSWAP
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mindev &= ~PARTITIONMASK;
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for (swp = swdevt; swp->sw_dev; swp++) {
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if (majdev == major(swp->sw_dev) &&
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mindev == (minor(swp->sw_dev) & ~PARTITIONMASK)) {
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temp = swdevt[0].sw_dev;
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swdevt[0].sw_dev = swp->sw_dev;
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swp->sw_dev = temp;
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break;
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}
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}
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if (swp->sw_dev == 0)
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return;
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/*
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* If dumpdev was the same as the old primary swap
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* device, move it to the new primary swap device.
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*/
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if (temp == dumpdev)
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dumpdev = swdevt[0].sw_dev;
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#endif
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}
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@ -1,7 +1,7 @@
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#
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# GENERIC -- Generic machine with WD/AHx/NCR/BTx family disks
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#
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# $Id: GENERIC,v 1.43 1995/04/24 05:33:58 phk Exp $
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# $Id: GENERIC,v 1.44 1995/05/02 04:40:06 phk Exp $
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#
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machine "i386"
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@ -23,7 +23,7 @@ options "SCSI_DELAY=15" #Be pessimistic about Joe SCSI device
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options BOUNCE_BUFFERS #include support for DMA bounce buffers
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options UCONSOLE #Allow users to grab the console
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config kernel root on wd0 swap on wd0 and wd1 and wd2 and wd3 and sd0 and sd1 and vn0 dumps on wd0
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config kernel root on wd0
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controller isa0
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controller pci0
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@ -2,7 +2,7 @@
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# LINT -- config file for checking all the sources, tries to pull in
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# as much of the source tree as it can.
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#
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# $Id: LINT,v 1.179 1995/05/11 02:15:37 jkh Exp $
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# $Id: LINT,v 1.180 1995/05/12 15:17:55 ache Exp $
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#
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# NB: You probably don't want to try running a kernel built from this
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# file. Instead, you should start from GENERIC, and add options from
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@ -58,7 +58,7 @@ options MATH_EMULATE #Support for x87 emulation
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# - The kernel can swap on wd0b and sd0b, defaulting to the former
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# - Crash dumps will be written to wd0b, if possible
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#
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config kernel root on wd0 swap on wd0 and sd0 dumps on wd0
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config kernel root on wd0
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#####################################################################
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@ -251,7 +251,9 @@ options UNION #Union filesystem
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# of kilobytes to reserve for the filesystem.
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options "MFS_ROOT=10"
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#
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# Allow this many swap-devices.
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options "NSWAPDEV=20"
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# Disk quotas are supported when this option is enabled. If you
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# change the value of this option, you must do a `make clean' in your
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# kernel compile directory in order to get a working kernel.
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@ -1,7 +1,7 @@
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#
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# GENERIC -- Generic machine with WD/AHx/NCR/BTx family disks
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#
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# $Id: GENERIC,v 1.43 1995/04/24 05:33:58 phk Exp $
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# $Id: GENERIC,v 1.44 1995/05/02 04:40:06 phk Exp $
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#
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machine "i386"
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@ -23,7 +23,7 @@ options "SCSI_DELAY=15" #Be pessimistic about Joe SCSI device
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options BOUNCE_BUFFERS #include support for DMA bounce buffers
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options UCONSOLE #Allow users to grab the console
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config kernel root on wd0 swap on wd0 and wd1 and wd2 and wd3 and sd0 and sd1 and vn0 dumps on wd0
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config kernel root on wd0
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controller isa0
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controller pci0
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@ -2,7 +2,7 @@
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# LINT -- config file for checking all the sources, tries to pull in
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# as much of the source tree as it can.
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#
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# $Id: LINT,v 1.179 1995/05/11 02:15:37 jkh Exp $
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# $Id: LINT,v 1.180 1995/05/12 15:17:55 ache Exp $
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#
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# NB: You probably don't want to try running a kernel built from this
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# file. Instead, you should start from GENERIC, and add options from
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@ -58,7 +58,7 @@ options MATH_EMULATE #Support for x87 emulation
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# - The kernel can swap on wd0b and sd0b, defaulting to the former
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# - Crash dumps will be written to wd0b, if possible
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#
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config kernel root on wd0 swap on wd0 and sd0 dumps on wd0
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config kernel root on wd0
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#####################################################################
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@ -251,7 +251,9 @@ options UNION #Union filesystem
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# of kilobytes to reserve for the filesystem.
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options "MFS_ROOT=10"
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#
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# Allow this many swap-devices.
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options "NSWAPDEV=20"
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# Disk quotas are supported when this option is enabled. If you
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# change the value of this option, you must do a `make clean' in your
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# kernel compile directory in order to get a working kernel.
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@ -2,7 +2,7 @@
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# LINT -- config file for checking all the sources, tries to pull in
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# as much of the source tree as it can.
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#
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# $Id: LINT,v 1.179 1995/05/11 02:15:37 jkh Exp $
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# $Id: LINT,v 1.180 1995/05/12 15:17:55 ache Exp $
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#
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# NB: You probably don't want to try running a kernel built from this
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# file. Instead, you should start from GENERIC, and add options from
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@ -58,7 +58,7 @@ options MATH_EMULATE #Support for x87 emulation
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# - The kernel can swap on wd0b and sd0b, defaulting to the former
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# - Crash dumps will be written to wd0b, if possible
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#
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config kernel root on wd0 swap on wd0 and sd0 dumps on wd0
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config kernel root on wd0
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#####################################################################
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@ -251,7 +251,9 @@ options UNION #Union filesystem
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# of kilobytes to reserve for the filesystem.
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options "MFS_ROOT=10"
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#
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# Allow this many swap-devices.
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options "NSWAPDEV=20"
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# Disk quotas are supported when this option is enabled. If you
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# change the value of this option, you must do a `make clean' in your
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# kernel compile directory in order to get a working kernel.
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@ -34,7 +34,7 @@
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* SUCH DAMAGE.
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*
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||||
* from: @(#)autoconf.c 7.1 (Berkeley) 5/9/91
|
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* $Id: autoconf.c,v 1.29 1995/05/11 19:26:07 rgrimes Exp $
|
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* $Id: autoconf.c,v 1.30 1995/05/12 19:17:11 wollman Exp $
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*/
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/*
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@ -57,7 +57,6 @@
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#include <machine/md_var.h>
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#include <machine/pte.h>
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static void swapconf(void);
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static void setroot(void);
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/*
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@ -209,43 +208,9 @@ configure()
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* parameter based on device(s) used.
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*/
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setconf();
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swapconf();
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cold = 0;
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}
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/*
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* Configure swap space and related parameters.
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*/
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static void
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swapconf()
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{
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register struct swdevt *swp;
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register int nblks;
|
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for (swp = swdevt; swp->sw_dev > 0; swp++)
|
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{
|
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unsigned d = major(swp->sw_dev);
|
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|
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if (d > nblkdev) break;
|
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if (bdevsw[d].d_psize) {
|
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nblks = (*bdevsw[d].d_psize)(swp->sw_dev);
|
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if (nblks > 0 &&
|
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(swp->sw_nblks == 0 || swp->sw_nblks > nblks))
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swp->sw_nblks = nblks;
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else
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swp->sw_nblks = 0;
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}
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swp->sw_nblks = ctod(dtoc(swp->sw_nblks));
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}
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if (dumpdev != NODEV) {
|
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if (dumplo == 0 && bdevsw[major(dumpdev)].d_psize)
|
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dumplo = (*bdevsw[major(dumpdev)].d_psize)(dumpdev) -
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Maxmem*NBPG/512;
|
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if (dumplo < 0)
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dumplo = 0;
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}
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||||
}
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int
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setdumpdev(dev_t dev)
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{
|
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@ -267,7 +232,6 @@ setdumpdev(dev_t dev)
|
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/*NOTREACHED*/
|
||||
}
|
||||
|
||||
#define DOSWAP /* change swdevt and dumpdev */
|
||||
u_long bootdev = 0; /* should be dev_t, but not until 32 bits */
|
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|
||||
static char devname[][2] = {
|
||||
@ -325,25 +289,4 @@ setroot()
|
||||
devname[majdev][0], devname[majdev][1],
|
||||
mindev >> (majdev == FDMAJOR ? FDUNITSHIFT : PARTITIONSHIFT),
|
||||
part + 'a');
|
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#ifdef DOSWAP
|
||||
mindev &= ~PARTITIONMASK;
|
||||
for (swp = swdevt; swp->sw_dev; swp++) {
|
||||
if (majdev == major(swp->sw_dev) &&
|
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mindev == (minor(swp->sw_dev) & ~PARTITIONMASK)) {
|
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|
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temp = swdevt[0].sw_dev;
|
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swdevt[0].sw_dev = swp->sw_dev;
|
||||
swp->sw_dev = temp;
|
||||
break;
|
||||
}
|
||||
}
|
||||
if (swp->sw_dev == 0)
|
||||
return;
|
||||
/*
|
||||
* If dumpdev was the same as the old primary swap
|
||||
* device, move it to the new primary swap device.
|
||||
*/
|
||||
if (temp == dumpdev)
|
||||
dumpdev = swdevt[0].sw_dev;
|
||||
#endif
|
||||
}
|
||||
|
||||
@ -36,7 +36,7 @@
|
||||
* SUCH DAMAGE.
|
||||
*
|
||||
* @(#)init_main.c 8.9 (Berkeley) 1/21/94
|
||||
* $Id: init_main.c,v 1.22 1995/04/23 04:13:51 phk Exp $
|
||||
* $Id: init_main.c,v 1.23 1995/05/04 08:21:24 davidg Exp $
|
||||
*/
|
||||
|
||||
#include <sys/param.h>
|
||||
@ -294,7 +294,6 @@ main(framep)
|
||||
VREF(fdp->fd_fd.fd_cdir);
|
||||
VOP_UNLOCK(rootvnode);
|
||||
fdp->fd_fd.fd_rdir = NULL;
|
||||
swapinit();
|
||||
|
||||
/*
|
||||
* Now can look at time, having had a chance to verify the time
|
||||
|
||||
@ -34,7 +34,7 @@
|
||||
* SUCH DAMAGE.
|
||||
*
|
||||
* @(#)nfs_vfsops.c 8.3 (Berkeley) 1/4/94
|
||||
* $Id: nfs_vfsops.c,v 1.11 1995/03/16 18:15:40 bde Exp $
|
||||
* $Id: nfs_vfsops.c,v 1.12 1995/03/16 20:23:46 wollman Exp $
|
||||
*/
|
||||
|
||||
#include <sys/param.h>
|
||||
@ -273,32 +273,15 @@ nfs_mountroot()
|
||||
(void) nfs_mountdiskless(buf, "/swap", 0,
|
||||
&nd->swap_saddr, &nd->swap_args, &vp);
|
||||
|
||||
for (i=0;swdevt[i].sw_dev != NODEV;i++) ;
|
||||
|
||||
/*
|
||||
* Since the swap file is not the root dir of a file system,
|
||||
* hack it to a regular file.
|
||||
*/
|
||||
vp->v_type = VREG;
|
||||
vp->v_flag = 0;
|
||||
swapdev_vp = vp;
|
||||
VREF(vp);
|
||||
swdevt[i].sw_vp = vp;
|
||||
swdevt[i].sw_nblks = nd->swap_nblks*2;
|
||||
|
||||
if (!swdevt[i].sw_nblks) {
|
||||
swdevt[i].sw_nblks = 2048;
|
||||
printf("defaulting to %d kbyte.\n",
|
||||
swdevt[i].sw_nblks/2);
|
||||
} else
|
||||
printf("using %d kbyte.\n",swdevt[i].sw_nblks/2);
|
||||
} else {
|
||||
/*
|
||||
* No NFS swap space was specified, try using local disk
|
||||
*/
|
||||
if (bdevvp(swapdev, &swapdev_vp))
|
||||
panic("nfs_mountroot: can't setup bdevvp for swap");
|
||||
}
|
||||
swaponvp(p, vp, NODEV, nd->swap_nblks * 2);
|
||||
}
|
||||
|
||||
/*
|
||||
* Create the rootfs mount point.
|
||||
|
||||
@ -34,7 +34,7 @@
|
||||
* SUCH DAMAGE.
|
||||
*
|
||||
* @(#)nfs_vfsops.c 8.3 (Berkeley) 1/4/94
|
||||
* $Id: nfs_vfsops.c,v 1.11 1995/03/16 18:15:40 bde Exp $
|
||||
* $Id: nfs_vfsops.c,v 1.12 1995/03/16 20:23:46 wollman Exp $
|
||||
*/
|
||||
|
||||
#include <sys/param.h>
|
||||
@ -273,32 +273,15 @@ nfs_mountroot()
|
||||
(void) nfs_mountdiskless(buf, "/swap", 0,
|
||||
&nd->swap_saddr, &nd->swap_args, &vp);
|
||||
|
||||
for (i=0;swdevt[i].sw_dev != NODEV;i++) ;
|
||||
|
||||
/*
|
||||
* Since the swap file is not the root dir of a file system,
|
||||
* hack it to a regular file.
|
||||
*/
|
||||
vp->v_type = VREG;
|
||||
vp->v_flag = 0;
|
||||
swapdev_vp = vp;
|
||||
VREF(vp);
|
||||
swdevt[i].sw_vp = vp;
|
||||
swdevt[i].sw_nblks = nd->swap_nblks*2;
|
||||
|
||||
if (!swdevt[i].sw_nblks) {
|
||||
swdevt[i].sw_nblks = 2048;
|
||||
printf("defaulting to %d kbyte.\n",
|
||||
swdevt[i].sw_nblks/2);
|
||||
} else
|
||||
printf("using %d kbyte.\n",swdevt[i].sw_nblks/2);
|
||||
} else {
|
||||
/*
|
||||
* No NFS swap space was specified, try using local disk
|
||||
*/
|
||||
if (bdevvp(swapdev, &swapdev_vp))
|
||||
panic("nfs_mountroot: can't setup bdevvp for swap");
|
||||
}
|
||||
swaponvp(p, vp, NODEV, nd->swap_nblks * 2);
|
||||
}
|
||||
|
||||
/*
|
||||
* Create the rootfs mount point.
|
||||
|
||||
@ -36,7 +36,7 @@
|
||||
* SUCH DAMAGE.
|
||||
*
|
||||
* @(#)conf.h 8.3 (Berkeley) 1/21/94
|
||||
* $Id: conf.h,v 1.12 1995/04/23 09:36:59 bde Exp $
|
||||
* $Id: conf.h,v 1.13 1995/05/12 19:17:24 wollman Exp $
|
||||
*/
|
||||
|
||||
#ifndef _SYS_CONF_H_
|
||||
@ -138,7 +138,6 @@ struct swdevt {
|
||||
#define sw_freed sw_flags /* XXX compat */
|
||||
|
||||
#ifdef KERNEL
|
||||
extern struct swdevt swdevt[];
|
||||
extern int setdumpdev __P((dev_t));
|
||||
|
||||
dev_t chrtoblk __P((dev_t dev));
|
||||
|
||||
@ -31,7 +31,7 @@
|
||||
* SUCH DAMAGE.
|
||||
*
|
||||
* @(#)gmon.h 8.2 (Berkeley) 1/4/94
|
||||
* $Id: gmon.h,v 1.3 1995/01/29 06:23:34 bde Exp $
|
||||
* $Id: gmon.h,v 1.4 1995/03/16 18:16:17 bde Exp $
|
||||
*/
|
||||
|
||||
#ifndef _SYS_GMON_H_
|
||||
@ -124,8 +124,8 @@ struct rawarc {
|
||||
/*
|
||||
* general rounding functions.
|
||||
*/
|
||||
#define ROUNDDOWN(x,y) (((x)/(y))*(y))
|
||||
#define ROUNDUP(x,y) ((((x)+(y)-1)/(y))*(y))
|
||||
#define ROUNDDOWN(x,y) rounddown(x,y)
|
||||
#define ROUNDUP(x,y) roundup(x,y)
|
||||
|
||||
/*
|
||||
* The profiling data structures are housed in this structure.
|
||||
|
||||
@ -36,7 +36,7 @@
|
||||
* SUCH DAMAGE.
|
||||
*
|
||||
* @(#)conf.h 8.3 (Berkeley) 1/21/94
|
||||
* $Id: conf.h,v 1.12 1995/04/23 09:36:59 bde Exp $
|
||||
* $Id: conf.h,v 1.13 1995/05/12 19:17:24 wollman Exp $
|
||||
*/
|
||||
|
||||
#ifndef _SYS_CONF_H_
|
||||
@ -138,7 +138,6 @@ struct swdevt {
|
||||
#define sw_freed sw_flags /* XXX compat */
|
||||
|
||||
#ifdef KERNEL
|
||||
extern struct swdevt swdevt[];
|
||||
extern int setdumpdev __P((dev_t));
|
||||
|
||||
dev_t chrtoblk __P((dev_t dev));
|
||||
|
||||
@ -36,7 +36,7 @@
|
||||
* SUCH DAMAGE.
|
||||
*
|
||||
* @(#)param.h 8.2 (Berkeley) 1/21/94
|
||||
* $Id: param.h,v 1.6 1995/01/09 16:05:13 davidg Exp $
|
||||
* $Id: param.h,v 1.7 1995/02/07 03:33:05 davidg Exp $
|
||||
*/
|
||||
|
||||
#ifndef _SYS_PARAM_H_
|
||||
@ -180,6 +180,7 @@
|
||||
#ifndef howmany
|
||||
#define howmany(x, y) (((x)+((y)-1))/(y))
|
||||
#endif
|
||||
#define rounddown(x, y) (((x)/(y))*(y))
|
||||
#define roundup(x, y) ((((x)+((y)-1))/(y))*(y))
|
||||
#define powerof2(x) ((((x)-1)&(x))==0)
|
||||
|
||||
|
||||
@ -36,7 +36,7 @@
|
||||
* SUCH DAMAGE.
|
||||
*
|
||||
* @(#)systm.h 8.4 (Berkeley) 2/23/94
|
||||
* $Id: systm.h,v 1.19 1995/04/04 02:02:28 davidg Exp $
|
||||
* $Id: systm.h,v 1.20 1995/05/02 05:35:07 davidg Exp $
|
||||
*/
|
||||
|
||||
#ifndef _SYS_SYSTM_H_
|
||||
@ -81,6 +81,7 @@ extern char copyright[]; /* system copyright */
|
||||
|
||||
extern int nblkdev; /* number of entries in bdevsw */
|
||||
extern int nchrdev; /* number of entries in cdevsw */
|
||||
extern struct swdevt *swdevt; /* swap-device information */
|
||||
extern int nswdev; /* number of swap devices */
|
||||
extern int nswap; /* size of swap space */
|
||||
|
||||
|
||||
@ -39,7 +39,7 @@
|
||||
* from: Utah $Hdr: swap_pager.c 1.4 91/04/30$
|
||||
*
|
||||
* @(#)swap_pager.c 8.9 (Berkeley) 3/21/94
|
||||
* $Id: swap_pager.c,v 1.37 1995/05/07 06:36:59 dyson Exp $
|
||||
* $Id: swap_pager.c,v 1.38 1995/05/10 18:56:02 davidg Exp $
|
||||
*/
|
||||
|
||||
/*
|
||||
@ -103,7 +103,7 @@ struct swpagerclean {
|
||||
|
||||
#define SWB_EMPTY (-1)
|
||||
|
||||
struct swpclean swap_pager_done; /* list of compileted page cleans */
|
||||
struct swpclean swap_pager_done; /* list of completed page cleans */
|
||||
struct swpclean swap_pager_inuse; /* list of pending page cleans */
|
||||
struct swpclean swap_pager_free; /* list of free pager clean structs */
|
||||
struct pagerlst swap_pager_list; /* list of "named" anon regions */
|
||||
|
||||
@ -31,7 +31,7 @@
|
||||
* SUCH DAMAGE.
|
||||
*
|
||||
* @(#)vm_extern.h 8.2 (Berkeley) 1/12/94
|
||||
* $Id: vm_extern.h,v 1.13 1995/03/16 18:17:08 bde Exp $
|
||||
* $Id: vm_extern.h,v 1.14 1995/05/10 18:56:04 davidg Exp $
|
||||
*/
|
||||
|
||||
#ifndef _VM_EXTERN_H_
|
||||
@ -98,10 +98,9 @@ void loadav __P((struct loadavg *));
|
||||
void munmapfd __P((struct proc *, int));
|
||||
int pager_cache __P((vm_object_t, boolean_t));
|
||||
void sched __P((void));
|
||||
void swapinit __P((void));
|
||||
int swaponvp __P((struct proc *, struct vnode *, dev_t , u_long ));
|
||||
void swapout __P((struct proc *));
|
||||
void swapout_threads __P((void));
|
||||
int swfree __P((struct proc *, int));
|
||||
void swstrategy __P((struct buf *));
|
||||
void thread_block __P((char *));
|
||||
void thread_sleep __P((int, simple_lock_t, boolean_t));
|
||||
|
||||
194
sys/vm/vm_swap.c
194
sys/vm/vm_swap.c
@ -31,7 +31,7 @@
|
||||
* SUCH DAMAGE.
|
||||
*
|
||||
* @(#)vm_swap.c 8.5 (Berkeley) 2/17/94
|
||||
* $Id: vm_swap.c,v 1.15 1995/03/16 18:17:33 bde Exp $
|
||||
* $Id: vm_swap.c,v 1.16 1995/05/12 03:54:59 phk Exp $
|
||||
*/
|
||||
|
||||
#include <sys/param.h>
|
||||
@ -53,72 +53,17 @@
|
||||
* Indirect driver for multi-controller paging.
|
||||
*/
|
||||
|
||||
int nswap, nswdev;
|
||||
#ifndef NSWAPDEV
|
||||
#define NSWAPDEV 4
|
||||
#endif
|
||||
static struct swdevt should_be_malloced[NSWAPDEV];
|
||||
struct swdevt *swdevt = should_be_malloced;
|
||||
int nswap;
|
||||
int nswdev = NSWAPDEV;
|
||||
int vm_swap_size;
|
||||
int bswneeded;
|
||||
vm_offset_t swapbkva; /* swap buffers kva */
|
||||
|
||||
/*
|
||||
* Set up swap devices.
|
||||
* Initialize linked list of free swap
|
||||
* headers. These do not actually point
|
||||
* to buffers, but rather to pages that
|
||||
* are being swapped in and out.
|
||||
*/
|
||||
void
|
||||
swapinit()
|
||||
{
|
||||
register struct proc *p = &proc0; /* XXX */
|
||||
struct swdevt *swp;
|
||||
int error;
|
||||
|
||||
/*
|
||||
* Count swap devices, and adjust total swap space available. Some of
|
||||
* the space will not be countable until later (dynamically
|
||||
* configurable devices) and some of the counted space will not be
|
||||
* available until a swapon() system call is issued, both usually
|
||||
* happen when the system goes multi-user.
|
||||
*
|
||||
* If using NFS for swap, swdevt[0] will already be bdevvp'd. XXX
|
||||
*/
|
||||
nswdev = 0;
|
||||
nswap = 0;
|
||||
for (swp = swdevt; swp->sw_dev != NODEV || swp->sw_vp != NULL; swp++) {
|
||||
nswdev++;
|
||||
if (swp->sw_nblks > nswap)
|
||||
nswap = swp->sw_nblks;
|
||||
}
|
||||
if (nswdev == 0)
|
||||
panic("swapinit");
|
||||
if (nswdev > 1)
|
||||
nswap = ((nswap + dmmax - 1) / dmmax) * dmmax;
|
||||
nswap *= nswdev;
|
||||
if (swdevt[0].sw_vp == NULL &&
|
||||
bdevvp(swdevt[0].sw_dev, &swdevt[0].sw_vp))
|
||||
panic("swapvp");
|
||||
/*
|
||||
* If there is no swap configured, tell the user. We don't
|
||||
* automatically activate any swapspaces in the kernel; the user must
|
||||
* explicitly use swapon to enable swaping on a device.
|
||||
*/
|
||||
if (nswap == 0)
|
||||
printf("WARNING: no swap space found\n");
|
||||
for (swp = swdevt;; swp++) {
|
||||
if (swp->sw_dev == NODEV) {
|
||||
if (swp->sw_vp == NULL)
|
||||
break;
|
||||
|
||||
/* We DO enable NFS swapspaces */
|
||||
error = swfree(p, swp - swdevt);
|
||||
if (error) {
|
||||
printf(
|
||||
"Couldn't enable swapspace %d, error = %d",
|
||||
swp - swdevt, error);
|
||||
}
|
||||
}
|
||||
}
|
||||
}
|
||||
|
||||
void
|
||||
swstrategy(bp)
|
||||
register struct buf *bp;
|
||||
@ -194,43 +139,53 @@ swapon(p, uap, retval)
|
||||
register struct vnode *vp;
|
||||
register struct swdevt *sp;
|
||||
dev_t dev;
|
||||
int error;
|
||||
int error,i;
|
||||
struct nameidata nd;
|
||||
struct vattr attr;
|
||||
|
||||
error = suser(p->p_ucred, &p->p_acflag);
|
||||
if (error)
|
||||
return (error);
|
||||
|
||||
NDINIT(&nd, LOOKUP, FOLLOW, UIO_USERSPACE, uap->name, p);
|
||||
error = namei(&nd);
|
||||
if (error)
|
||||
return (error);
|
||||
|
||||
vp = nd.ni_vp;
|
||||
if (vp->v_type != VBLK) {
|
||||
vrele(vp);
|
||||
return (ENOTBLK);
|
||||
}
|
||||
dev = (dev_t) vp->v_rdev;
|
||||
if (major(dev) >= nblkdev) {
|
||||
vrele(vp);
|
||||
return (ENXIO);
|
||||
}
|
||||
for (sp = &swdevt[0]; sp->sw_dev != NODEV; sp++) {
|
||||
if (sp->sw_dev == dev) {
|
||||
if (sp->sw_flags & SW_FREED) {
|
||||
vrele(vp);
|
||||
return (EBUSY);
|
||||
}
|
||||
sp->sw_vp = vp;
|
||||
error = swfree(p, sp - swdevt);
|
||||
if (error) {
|
||||
vrele(vp);
|
||||
return (error);
|
||||
}
|
||||
return (0);
|
||||
|
||||
switch (vp->v_type) {
|
||||
case VBLK:
|
||||
dev = (dev_t) vp->v_rdev;
|
||||
if (major(dev) >= nblkdev) {
|
||||
error = ENXIO;
|
||||
break;
|
||||
}
|
||||
error = swaponvp(p, vp, dev, 0);
|
||||
break;
|
||||
case VCHR:
|
||||
/*
|
||||
* For now, we disallow swapping to regular files.
|
||||
* It requires logical->physcal block translation
|
||||
* support in the swap pager before it will work.
|
||||
*/
|
||||
error = ENOTBLK;
|
||||
break;
|
||||
#if 0
|
||||
error = VOP_GETATTR(vp, &attr, p->p_ucred, p);
|
||||
if (!error)
|
||||
error = swaponvp(p, vp, NODEV, attr.va_size / DEV_BSIZE);
|
||||
break;
|
||||
#endif
|
||||
default:
|
||||
error = EINVAL;
|
||||
break;
|
||||
}
|
||||
vrele(vp);
|
||||
return (EINVAL);
|
||||
|
||||
if (error)
|
||||
vrele(vp);
|
||||
|
||||
return (error);
|
||||
}
|
||||
|
||||
/*
|
||||
@ -240,49 +195,54 @@ swapon(p, uap, retval)
|
||||
* among the devices.
|
||||
*/
|
||||
int
|
||||
swfree(p, index)
|
||||
swaponvp(p, vp, dev, nblks)
|
||||
struct proc *p;
|
||||
int index;
|
||||
struct vnode *vp;
|
||||
dev_t dev;
|
||||
u_long nblks;
|
||||
{
|
||||
int index;
|
||||
register struct swdevt *sp;
|
||||
register swblk_t vsbase;
|
||||
register long blk;
|
||||
struct vnode *vp;
|
||||
register swblk_t dvbase;
|
||||
register int nblks;
|
||||
swblk_t dvbase;
|
||||
struct swdevt *swp;
|
||||
int error;
|
||||
int perdev;
|
||||
|
||||
for (sp = swdevt, index = 0 ; index < nswdev; index++, sp++) {
|
||||
if (sp->sw_vp == vp)
|
||||
return EBUSY;
|
||||
if (!sp->sw_vp)
|
||||
goto found;
|
||||
|
||||
}
|
||||
return EINVAL;
|
||||
found:
|
||||
if (dev != NODEV && (major(dev) >= nblkdev))
|
||||
return (ENXIO);
|
||||
|
||||
sp = &swdevt[index];
|
||||
vp = sp->sw_vp;
|
||||
error = VOP_OPEN(vp, FREAD | FWRITE, p->p_ucred, p);
|
||||
if (error)
|
||||
return (error);
|
||||
sp->sw_flags |= SW_FREED;
|
||||
nblks = sp->sw_nblks;
|
||||
/*
|
||||
* Some devices may not exist til after boot time. If so, their nblk
|
||||
* count will be 0.
|
||||
*/
|
||||
if (nblks <= 0) {
|
||||
int perdev;
|
||||
dev_t dev = sp->sw_dev;
|
||||
|
||||
if (bdevsw[major(dev)].d_psize == 0 ||
|
||||
(nblks = (*bdevsw[major(dev)].d_psize) (dev)) == -1) {
|
||||
(void) VOP_CLOSE(vp, FREAD | FWRITE, p->p_ucred, p);
|
||||
sp->sw_flags &= ~SW_FREED;
|
||||
return (ENXIO);
|
||||
}
|
||||
perdev = nswap / nswdev;
|
||||
if (nblks > perdev)
|
||||
nblks = perdev;
|
||||
sp->sw_nblks = nblks;
|
||||
|
||||
if (nblks == 0 && (bdevsw[major(dev)].d_psize == 0 ||
|
||||
(nblks = (*bdevsw[major(dev)].d_psize) (dev)) == -1)) {
|
||||
(void) VOP_CLOSE(vp, FREAD | FWRITE, p->p_ucred, p);
|
||||
return (ENXIO);
|
||||
}
|
||||
if (nblks == 0) {
|
||||
(void) VOP_CLOSE(vp, FREAD | FWRITE, p->p_ucred, p);
|
||||
sp->sw_flags &= ~SW_FREED;
|
||||
return (0); /* XXX error? */
|
||||
return (ENXIO);
|
||||
}
|
||||
sp->sw_vp = vp;
|
||||
sp->sw_dev = dev;
|
||||
sp->sw_flags |= SW_FREED;
|
||||
sp->sw_nblks = nblks;
|
||||
|
||||
if (nblks * nswdev > nswap)
|
||||
nswap = nblks * nswdev;
|
||||
|
||||
for (dvbase = dmmax; dvbase < nblks; dvbase += dmmax) {
|
||||
blk = nblks - dvbase;
|
||||
|
||||
|
||||
Loading…
Reference in New Issue
Block a user