Commit Graph

125 Commits

Author SHA1 Message Date
Poul-Henning Kamp
3e019deaed Do a pass over all modules in the kernel and make them return EOPNOTSUPP
for unknown events.

A number of modules return EINVAL in this instance, and I have left
those alone for now and instead taught MOD_QUIESCE to accept this
as "didn't do anything".
2004-07-15 08:26:07 +00:00
Poul-Henning Kamp
89c9c53da0 Do the dreaded s/dev_t/struct cdev */
Bump __FreeBSD_version accordingly.
2004-06-16 09:47:26 +00:00
Pawel Jakub Dawidek
6a40892929 Fix panic which occurs when given sector size for memory-backed device
is less than DEV_BSIZE (512) bytes.

Reported by:	Mike Bristow <mike@urgle.com>
Approved by:	phk
2004-05-18 07:30:04 +00:00
Warner Losh
ed010cdfa2 Ooops, removed this acknowledgement bogusly.
Eagle Eyes: bde
2004-04-09 05:12:47 +00:00
Warner Losh
f36cfd49ad Remove advertising clause from University of California Regent's
license, per letter dated July 22, 1999 and email from Peter Wemm,
Alan Cox and Robert Watson.

Approved by: core, peter, alc, rwatson
2004-04-07 20:46:16 +00:00
Alan Cox
121230a40d In some cases, sf_buf_alloc() should sleep with pri PCATCH; in others, it
should not.  Add a new parameter so that the caller can specify which is
the case.

Reported by:	dillon
2004-04-03 09:16:27 +00:00
Luigi Rizzo
5d4ca75e56 Fix a bug with preloaded image -- for some reason [that i don't
completely understand], md_takeroot() runs before md_preloaded(),
rendering both useless.
As a fix, move the body (effectively one line!) of md_takeroot()
into md_preloaded(), and get rid of the stuff that has become useless.

Bug and fix reported 10 days ago on -current, no reply.
2004-03-31 21:48:02 +00:00
Alan Cox
07be617f09 - Remove some unused #includes.
- Apply some style fixes to mdstart_swap().
2004-03-19 21:19:15 +00:00
Alan Cox
7cd53fdda8 Utilize sf_buf_alloc() and sf_buf_free() to implement the ephemeral
mappings required by mdstart_swap().  On i386, if the ephemeral mapping
is already in the sf_buf mapping cache, a swap-backed md performs
similarly to a malloc-backed md.  Even if the ephemeral mapping is not
cached, this implementation is still faster.  On 64-bit platforms, this
change has the effect of using the direct virtual-to-physical mapping,
avoiding ephemeral mapping overheads, such as TLB shootdowns on SMPs.

On a 2.4GHz, 400MHz FSB P4 Xeon configured with 64K sf_bufs and
"mdmfs -S -o async -s 128m md /mnt"

before:
dd if=/dev/md0 of=/dev/null bs=64k
134217728 bytes transferred in 0.430923 secs (311465697 bytes/sec)

after with cold sf_buf cache:
dd if=/dev/md0 of=/dev/null bs=64k
134217728 bytes transferred in 0.367948 secs (364773576 bytes/sec)

after with warm sf_buf cache:
dd if=/dev/md0 of=/dev/null bs=64k
134217728 bytes transferred in 0.252826 secs (530870010 bytes/sec)

malloc-backed md:
dd if=/dev/md0 of=/dev/null bs=64k
134217728 bytes transferred in 0.253126 secs (530240978 bytes/sec)
2004-03-18 18:23:37 +00:00
Alan Cox
33651381b7 Allow swap-backed devices to run without Giant. 2004-03-14 00:24:30 +00:00
Poul-Henning Kamp
7a6b2b6429 Fix a long-standing deadlock issue with vnode backed md(4) devices:
On vnode backed md(4) devices over a certain, currently undetermined
size relative to the buffer cache our "lemming-syncer" can provoke
a buffer starvation which puts the md thread to sleep on wdrain.

This generally tends to grind the entire system to a stop because the
event that is supposed to wake up the thread will not happen until a fair
bit of the piled up I/O requests in the system finish, and since a lot
of those are on a md(4) vnode backed device which is currently waiting
on wdrain until a fair amount of the piled up ... you get the picture.

The cure is to issue all VOP_WRITES on the vnode backing the device
with IO_SYNC.

In addition to more closely emulating a real disk device with a
non-lying write-cache, this makes the writes exempt from rate-limited
(there to avoid starving the buffer cache) and consequently prevents
the deadlock.

Unfortunately performance takes a hit.

Add "async" option to give people who know what they are doing the
old behaviour.
2004-03-10 20:41:09 +00:00
John Baldwin
6074439965 kthread_exit() no longer requires Giant, so don't force callers to acquire
Giant just to call kthread_exit().

Requested by:	many
2004-03-05 22:42:17 +00:00
Poul-Henning Kamp
9ed40643ea Make swapbacked md(4) devices respect the -x and -y emulation arguments. 2004-03-02 20:13:23 +00:00
Colin Percival
e07113d65c Use DEV_BSIZE byte sectors instead of PAGE_SIZE byte sectors for
swap-backed memory disks.  This reduces filesystem allocation overhead
and makes swap-backed memory disks compatible with broken code (dd,
for example) which expects to see 512 byte sectors.  The size of a
swap-backed memory disk must still be a multiple of the page size.

When performing page-aligned operations, this change has zero
performance impact.

Reviewed by:	phk
Approved by:	rwatson (mentor)
2004-02-29 15:58:54 +00:00
Poul-Henning Kamp
dc08ffec87 Device megapatch 4/6:
Introduce d_version field in struct cdevsw, this must always be
initialized to D_VERSION.

Flip sense of D_NOGIANT flag to D_NEEDGIANT, this involves removing
four D_NOGIANT flags and adding 145 D_NEEDGIANT flags.
2004-02-21 21:10:55 +00:00
Poul-Henning Kamp
d5a929dc17 Allow specification of a geometry for vnode backed devices as well as
for malloc backed devices.
2004-01-12 10:52:00 +00:00
Poul-Henning Kamp
0a93720637 Fix a locking problem with MD_ROOT_SIZE.
Retire md(4)'s static major number.
2003-12-13 18:12:58 +00:00
Poul-Henning Kamp
0eb1430969 Use the class->init() to hitch up preload devices, rather than rely on
the "old" SYSINIT.  This makes sure things happen in the right order.

XXX: md(4) needs to be fully geom-ified and in particluar /dev/md.ctl
should be abandonded for the GEOM OaM api.

Approved by:	re@
2003-11-18 18:19:26 +00:00
Poul-Henning Kamp
6e9a011a6a Don't initialize unused bio_blkno field. 2003-10-18 11:25:42 +00:00
Poul-Henning Kamp
70cd771337 The present defaults for the open and close for device drivers which
provide no methods does not make any sense, and is not used by any
driver.

It is a pretty hard to come up with even a theoretical concept of
a device driver which would always fail open and close with ENODEV.

Change the defaults to be nullopen() and nullclose() which simply
does nothing.

Remove explicit initializations to these from the drivers which
already used them.
2003-09-27 12:01:01 +00:00
John Baldwin
8b149b5131 Consistently use the BSD u_int and u_short instead of the SYSV uint and
ushort.  In most of these files, there was a mixture of both styles and
this change just makes them self-consistent.

Requested by:	bde (kern_ktrace.c)
2003-08-07 15:04:27 +00:00
Poul-Henning Kamp
8e28326a8b Change the implementation of swap backing to use the VM system in normal
ways, and drop the need for vm_pager_strategy().
2003-08-05 06:54:44 +00:00
Poul-Henning Kamp
7c89f162bc Add fdidx argument to vn_open() and vn_open_cred() and pass -1 throughout. 2003-07-27 17:04:56 +00:00
Poul-Henning Kamp
8198a1a472 Remove 256 unit limit, there is no evil minor number encoding to
deal with any more.

Spotted by:	"Darren Freestone" <df@cops.org>
2003-06-22 11:31:38 +00:00
Poul-Henning Kamp
f075585f67 Remove the G_CLASS_INITIALIZER, we do not need it anymore. 2003-05-31 16:59:27 +00:00
Poul-Henning Kamp
17a1391990 The IO_NOWDRAIN and B_NOWDRAIN hacks are no longer needed to prevent
deadlocks with vnode backed md(4) devices because md now uses a
kthread to run the bio requests instead of doing it directly from
the bio down path.
2003-05-31 16:42:45 +00:00
Alan Cox
f820bc501e Use vm_object_deallocate(), not vm_pager_deallocate(), to destroy a
vm object.  (vm_pager_deallocate() does not, in fact, destroy a vm object.)

Approved by:	re (scottl)
Reviewed by:	phk
2003-05-16 07:28:27 +00:00
Poul-Henning Kamp
6b60a2cd57 Call g_wither_geom(), instead of just setting the flag. 2003-05-02 06:18:58 +00:00
Poul-Henning Kamp
4e8bfe1482 Add a couple of undocumented test options to MD(4) to aid in regression
testting of GEOM.
2003-04-09 11:59:29 +00:00
Poul-Henning Kamp
4eba52a2d2 Remove all references to BIO_SETATTR. We will not be using it. 2003-04-03 19:19:36 +00:00
Poul-Henning Kamp
891619a66d Use bioq_flush() to drain a bio queue with a specific error code.
Retain the mistake of not updating the devstat API for now.

Spell bioq_disksort() consistently with the remaining bioq_*().

#include <geom/geom_disk.h> where this is more appropriate.
2003-04-01 15:06:26 +00:00
Poul-Henning Kamp
51a5b7f1ba Don't include <sys/disk.h>. 2003-04-01 13:33:28 +00:00
Poul-Henning Kamp
67ffbc63f3 remove a blank line. 2003-03-29 22:13:32 +00:00
Poul-Henning Kamp
83e13864c3 Allocate the toplevel indir with M_WAITOK to avoid complicating things
needlessly.

Detected by:	rwatsons EvilMalloc(9)
2003-03-27 10:14:36 +00:00
Poul-Henning Kamp
5d445dcb4e Change g_class initialization to sparse format. 2003-03-24 19:46:26 +00:00
Poul-Henning Kamp
b4b138c27f Including <sys/stdint.h> is (almost?) universally only to be able to use
%j in printfs, so put a newsted include in <sys/systm.h> where the printf
prototype lives and save everybody else the trouble.
2003-03-18 08:45:25 +00:00
Poul-Henning Kamp
60794e0478 Centralize the devstat handling for all GEOM disk device drivers
in geom_disk.c.

As a side effect this makes a lot of #include <sys/devicestat.h>
lines not needed and some biofinish() calls can be reduced to
biodone() again.
2003-03-08 08:01:31 +00:00
Poul-Henning Kamp
ebe789d61c Add a "-S sectorsize" option to enable Kirk to find a bug :-) 2003-03-03 13:05:00 +00:00
Poul-Henning Kamp
7ac40f5f59 Gigacommit to improve device-driver source compatibility between
branches:

Initialize struct cdevsw using C99 sparse initializtion and remove
all initializations to default values.

This patch is automatically generated and has been tested by compiling
LINT with all the fields in struct cdevsw in reverse order on alpha,
sparc64 and i386.

Approved by:    re(scottl)
2003-03-03 12:15:54 +00:00
Warner Losh
a163d034fa Back out M_* changes, per decision of the TRB.
Approved by: trb
2003-02-19 05:47:46 +00:00
Poul-Henning Kamp
b3b3d1b7fe Mark our provider with G_PF_CANDELETE in the cases where this is actually
the case.
2003-02-11 12:35:44 +00:00
Poul-Henning Kamp
5777c5b989 NO_GEOM cleanup: unifdef 2003-01-30 13:12:31 +00:00
Poul-Henning Kamp
16bcbe8cf7 Implement MDIOCLIST which returns the unit numbers of configured md(4)
devices.

We use the md_pad[] array and if there are more units than its size the
last returned unit number will be -1, but the number of units returned
is correct.
2003-01-27 07:58:18 +00:00
Alfred Perlstein
44956c9863 Remove M_TRYWAIT/M_WAITOK/M_WAIT. Callers should use 0.
Merge M_NOWAIT/M_DONTWAIT into a single flag M_NOWAIT.
2003-01-21 08:56:16 +00:00
Poul-Henning Kamp
26d48b4044 OK Ok, so I didn't check the NO_GEOM case for the final version...
Stumbled on by:	bde
2003-01-13 20:19:04 +00:00
Poul-Henning Kamp
a4f8615810 Enable the new h0h0magic code which on GEOM kernels make the md(4)
driver a _real_ GEOM driver.
2003-01-13 17:31:46 +00:00
Poul-Henning Kamp
0f8500a5b3 Add a mutex around the per unit bioqueue.
Only grab giant in the per unit kthread for SWAP and VNODE backed devices.

Initialize the bioq before the kthread gets a chance to study it.

Don't lock Giant in mddone_swap, we shouldn't need it.
2003-01-13 08:50:23 +00:00
Poul-Henning Kamp
64bfc43b26 Remove the printf which announces the creation of malloc disks: it is
inconsistent when we do not do it for swap or vnode.

We still printf for preloaded disks because of the weak debugging
options people have in embedded/tiny environments where this is
usually used.
2003-01-13 08:01:09 +00:00
Poul-Henning Kamp
6f4f00f114 Add code to make md(4) a GEOM device driver instead of relying in
the disk mini-layer.

This is currently not enabled.
2003-01-12 21:16:49 +00:00
Poul-Henning Kamp
a522a15950 Shift things around a bit in preparation for future evilness. 2003-01-12 17:39:29 +00:00