From: Greg KH <gregkh@suse.de>
To: linux-kernel@vger.kernel.org, stable@kernel.org
Cc: stable-review@kernel.org, torvalds@linux-foundation.org,
akpm@linux-foundation.org, alan@lxorguk.ukuu.org.uk,
NeilBrown <neilb@suse.de>
Subject: [23/49] md: fix bug with re-adding of partially recovered device.
Date: Wed, 05 Jan 2011 15:00:41 -0800 [thread overview]
Message-ID: <20110105230325.781267069@clark.site> (raw)
In-Reply-To: <20110105230438.GA26241@kroah.com>
2.6.32-longterm review patch. If anyone has any objections, please let us know.
------------------
From: NeilBrown <neilb@suse.de>
commit 1a855a0606653d2d82506281e2c686bacb4b2f45 upstream.
With v0.90 metadata, a hot-spare does not become a full member of the
array until recovery is complete. So if we re-add such a device to
the array, we know that all of it is as up-to-date as the event count
would suggest, and so it a bitmap-based recovery is possible.
However with v1.x metadata, the hot-spare immediately becomes a full
member of the array, but it record how much of the device has been
recovered. If the array is stopped and re-assembled recovery starts
from this point.
When such a device is hot-added to an array we currently lose the 'how
much is recovered' information and incorrectly included it as a full
in-sync member (after bitmap-based fixup).
This is wrong and unsafe and could corrupt data.
So be more careful about setting saved_raid_disk - which is what
guides the re-adding of devices back into an array.
The new code matches the code in slot_store which does a similar
thing, which is encouraging.
This is suitable for any -stable kernel.
Reported-by: "Dailey, Nate" <Nate.Dailey@stratus.com>
Signed-off-by: NeilBrown <neilb@suse.de>
Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
---
drivers/md/md.c | 7 +++++--
1 file changed, 5 insertions(+), 2 deletions(-)
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -4802,7 +4802,7 @@ static int add_new_disk(mddev_t * mddev,
PTR_ERR(rdev));
return PTR_ERR(rdev);
}
- /* set save_raid_disk if appropriate */
+ /* set saved_raid_disk if appropriate */
if (!mddev->persistent) {
if (info->state & (1<<MD_DISK_SYNC) &&
info->raid_disk < mddev->raid_disks)
@@ -4812,7 +4812,10 @@ static int add_new_disk(mddev_t * mddev,
} else
super_types[mddev->major_version].
validate_super(mddev, rdev);
- rdev->saved_raid_disk = rdev->raid_disk;
+ if (test_bit(In_sync, &rdev->flags))
+ rdev->saved_raid_disk = rdev->raid_disk;
+ else
+ rdev->saved_raid_disk = -1;
clear_bit(In_sync, &rdev->flags); /* just to be sure */
if (info->state & (1<<MD_DISK_WRITEMOSTLY))
next prev parent reply other threads:[~2011-01-05 23:06 UTC|newest]
Thread overview: 40+ messages / expand[flat|nested] mbox.gz Atom feed top
2011-01-05 23:04 [00/49] 2.6.32.28-longterm review Greg KH
2011-01-05 23:00 ` Greg KH
2011-01-05 23:00 ` [01/49] TTY: Fix error return from tty_ldisc_open() Greg KH
2011-01-05 23:00 ` [02/49] x86, hotplug: Use mwait to offline a processor, fix the legacy case Greg KH
2011-01-05 23:00 ` Greg KH
2011-01-05 23:00 ` [03/49] fuse: verify ioctl retries Greg KH
2011-01-05 23:00 ` [04/49] fuse: fix ioctl when server is 32bit Greg KH
2011-01-05 23:00 ` [05/49] ALSA: hda: Use model=lg quirk for LG P1 Express to enable playback and capture Greg KH
2011-01-05 23:00 ` [06/49] drm/kms: remove spaces from connector names (v2) Greg KH
2011-01-05 23:49 ` [Stable-review] " Ben Hutchings
2011-01-05 23:56 ` Greg KH
2011-01-06 0:04 ` Ben Hutchings
2011-01-06 0:32 ` Alex Deucher
2011-01-05 23:00 ` [07/49] nohz: Fix printk_needs_cpu() return value on offline cpus Greg KH
2011-01-05 23:00 ` [08/49] nohz: Fix get_next_timer_interrupt() vs cpu hotplug Greg KH
2011-01-05 23:00 ` [09/49] NFS: Fix panic after nfs_umount() Greg KH
2011-01-05 23:00 ` [10/49] nfsd: Fix possible BUG_ON firing in set_change_info Greg KH
2011-01-05 23:00 ` [11/49] NFS: Fix fcntl F_GETLK not reporting some conflicts Greg KH
2011-01-05 23:00 ` [12/49] sunrpc: prevent use-after-free on clearing XPT_BUSY Greg KH
2011-01-05 23:00 ` [13/49] hwmon: (adm1026) Allow 1 as a valid divider value Greg KH
2011-01-05 23:00 ` [14/49] hwmon: (adm1026) Fix setting fan_div Greg KH
2011-01-05 23:00 ` [15/49] amd64_edac: Fix interleaving check Greg KH
2011-01-05 23:00 ` [16/49] IB/uverbs: Handle large number of entries in poll CQ Greg KH
2011-01-05 23:00 ` [17/49] PM / Hibernate: Fix PM_POST_* notification with user-space suspend Greg KH
2011-01-05 23:00 ` [18/49] ACPICA: Fix Scope() op in module level code Greg KH
2011-01-05 23:00 ` [19/49] ACPI: EC: Add another dmi match entry for MSI hardware Greg KH
2011-01-05 23:00 ` [20/49] orinoco: fix TKIP countermeasure behaviour Greg KH
2011-01-05 23:00 ` [21/49] orinoco: clear countermeasure setting on commit Greg KH
2011-01-05 23:00 ` [22/49] x86, amd: Fix panic on AMD CPU family 0x15 Greg KH
2011-01-05 23:00 ` Greg KH [this message]
2011-01-05 23:00 ` [24/49] tracing: Fix panic when lseek() called on "trace" opened for writing Greg KH
2011-01-05 23:00 ` [25/49] x86, gcc-4.6: Use gcc -m options when building vdso Greg KH
2011-01-05 23:00 ` [26/49] x86: Enable the intr-remap fault handling after local APIC setup Greg KH
2011-01-05 23:00 ` [27/49] x86, vt-d: Handle previous faults after enabling fault handling Greg KH
2011-01-05 23:00 ` [28/49] x86, vt-d: Fix the vt-d fault handling irq migration in the x2apic mode Greg KH
2011-01-05 23:00 ` [29/49] x86, vt-d: Quirk for masking vtd spec errors to platform error handling logic Greg KH
2011-01-05 23:00 ` [30/49] hvc_console: Fix race between hvc_close and hvc_remove Greg KH
2011-01-05 23:00 ` Greg KH
2011-01-05 23:00 ` [31/49] hvc_console: Fix race between hvc_close and hvc_remove, again Greg KH
2011-01-05 23:00 ` [32/49] HID: hidraw: fix window in hidraw_release Greg KH
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