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btrfs: zoned: fix zone activation with missing devices

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commit 2bbc4a45e5eb6b868357c1045bf6f38f6ba576e0 upstream.

If btrfs_zone_activate() is called with a filesystem that has missing
devices (e.g. a RAID file system mounted in degraded mode) it is accessing
the btrfs_device::zone_info pointer, which will not be set if the device in
question is missing.

Check if the device is present (by checking if it has a valid block
device pointer associated) and if not, skip zone activation for it.

Fixes: f9a912a3c4 ("btrfs: zoned: make zone activation multi stripe capable")
CC: stable@vger.kernel.org # 6.1+
Reviewed-by: Naohiro Aota <naohiro.aota@wdc.com>
Reviewed-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
This commit is contained in:
Johannes Thumshirn
2025-03-17 12:24:58 +01:00
committed by Greg Kroah-Hartman
parent 897ad7f70d
commit fa55f2a31b
1 changed files with 3 additions and 0 deletions
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3
fs/btrfs/zoned.c
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@@ -2006,6 +2006,9 @@ bool btrfs_zone_activate(struct btrfs_block_group *block_group)
physical = map->stripes[i].physical;
zinfo = device->zone_info;
if (!device->bdev)
continue;
if (zinfo->max_active_zones == 0)
continue;