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authoroster <oster@NetBSD.org>2004-03-20 04:22:05 +0000
committeroster <oster@NetBSD.org>2004-03-20 04:22:05 +0000
commit0ff214564803add4a3a9ef738c0dd02b41f2ff38 (patch)
tree5b812f74f0b9cee4b4fa44dae5b864947345022c /sys/dev/raidframe/rf_raid.h
parent068442743911ba78048d0658f611997a42661a9c (diff)
For each RAID set, pre-allocate a number of "emergency buffers" to be
used in the event that we can't malloc a buffer of the appropriate size in the traditional way. rf_AllocIOBuffer() and rf_FreeIOBuffer() deal with allocating/freeing these structures. These buffers are stored in a list on the 'iobuf' list. iobuf_count keeps track of how many buffers are available, and numEmergencyBuffers is the effective "high-water" mark for the freelist. The buffers allocated by rf_AllocIOBuffer() are stripe-unit sized, which is the maximum size requested by any of the callers. Add an iobufs entry to RF_DagHeader_s. Use it for keeping track of buffers that get allocated from the free-list. Add a "generic list" pool (VoidPointerListElement Pool) for elements used to maintain a list of allocated memory. [It is somewhat less than ideal to add another little pool to handle this...] Teach rf_AllocBuffer() to use the new rf_AllocIOBuffer(). Modify other Mallocs to use rf_AllocIOBuffer(), and to update dag_h->iobufs as appropriate. Update rf_FreeDAG() to handle cleanup of dag_h->iobufs. While here, add some missing pool_destroy() calls for a number of pools. With these changes, it should (in theory) be possible to swap on RAID 5 sets again. That said, I've not had any success there yet -- but the last issue I saw at least wasn't in RAIDframe. :-} [There is room for this code to become a bit more consise, but I wanted to do a checkpoint here with something known to work :) ]
Diffstat (limited to 'sys/dev/raidframe/rf_raid.h')
-rw-r--r--sys/dev/raidframe/rf_raid.h6
1 files changed, 5 insertions, 1 deletions
diff --git a/sys/dev/raidframe/rf_raid.h b/sys/dev/raidframe/rf_raid.h
index 62abcfddf15..8fa04f4ff67 100644
--- a/sys/dev/raidframe/rf_raid.h
+++ b/sys/dev/raidframe/rf_raid.h
@@ -1,4 +1,4 @@
-/* $NetBSD: rf_raid.h,v 1.31 2004/03/19 17:04:35 oster Exp $ */
+/* $NetBSD: rf_raid.h,v 1.32 2004/03/20 04:22:05 oster Exp $ */
/*
* Copyright (c) 1995 Carnegie-Mellon University.
* All rights reserved.
@@ -164,6 +164,10 @@ struct RF_Raid_s {
/* and a lock to protect it */
struct simplelock iodone_lock;
+
+ RF_IOBufHeader_t *iobuf; /* I/O buffer free list */
+ int iobuf_count; /* count of I/O buffers on the freelist */
+ int numEmergencyBuffers; /* number of these buffers to pre-allocate */
/*
* Cleanup stuff
*/