From: Michael J. Evans <mjevans1983@xxxxxxxxx>
In current release kernels the md module (Software RAID) uses a static array
(dev_t[128]) to store partition/device info temporarily for autostart.
This patch replaces that static array with a list.
Signed-off-by: Michael J. Evans <mjevans1983@xxxxxxxxx>
---
CCing akpm@xxxxxxxxxxxxxxxxxxxx
Version 5:
patched modified to cleanly patch against 2.6.23-rc4 (Offsets only)
Removed credit from head of file since the changelogs are archived.
Version 4:
Minor formatting cleanup for kzAlloc error message.
Should I remove the first patch section in version 5?
Version 3:
md_autodetect_dev failure message is now more usefully verbose.
removed unused i_found that was leftover from initial verification.
Thank you Randy Dunlap for pointing where INT_MAX was, fixme fixed.
Version 2:
using list_add_tail, and corrected missing i_passed++;.
removed sections of code that would never be reached.
Version 1:
The data/structures are only used within md.c, and very close together.
However I wonder if the structural information shouldn't go in to...
../../include/linux/raid/md_k.h instead.
I discovered this (and that the devices are added as disks/partitions are
discovered at boot) while I was debugging why only one of my MD arrays would
come up whole, while all the others were short a disk.
I eventually discovered that it was enumerating through all of 9 of my 11 hds
(2 had only 4 partitions apiece) while the other 9 have 15 partitions
(I wanted 64 per drive...). The last partition of the 8th drive in my 9 drive
raid 5 sets wasn't added, thus making the final md array short both a parity
and data disk, and it was started later, elsewhere.
Subject: [patch 1/1] md: Software Raid autodetect dev list not array
SOFTWARE RAID (Multiple Disks) SUPPORT
P: Ingo Molnar
M: mingo@xxxxxxxxxx
P: Neil Brown
M: neilb@xxxxxxx
L: linux-raid@xxxxxxxxxxxxxxx
S: Supported
Unless you have a reason NOT to do so, CC linux-kernel@xxxxxxxxxxxxxxxx
12: Has been tested with CONFIG_PREEMPT, CONFIG_DEBUG_PREEMPT,
CONFIG_DEBUG_SLAB, CONFIG_DEBUG_PAGEALLOC, CONFIG_DEBUG_MUTEXES,
CONFIG_DEBUG_SPINLOCK, CONFIG_DEBUG_SPINLOCK_SLEEP all simultaneously
enabled.
It has been tested with CONFIG_SMP set and unset (Different x86_64 systems).
It has been tested with CONFIG_PREEMPT set and unset (same system).
CONFIG_LBD isn't even an option in my .config file.
Note: between 2.6.22 and 2.6.23-rc3-git5
rdev = md_import_device(dev,0, 0);
became
rdev = md_import_device(dev,0, 90);
So the patch has been edited to patch around that line.
Signed-off-by: Michael J. Evans <mjevans1983@xxxxxxxxx>