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btrfs: add device major-minor info in the struct btrfs_device

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Internally it is common to use the major-minor number to identify a
device and, at a few locations in btrfs, we use the major-minor number
to match the device.

So when we identify a new btrfs device through device add or device
replace or device-scan/ready save the device's major-minor (dev_t) in the
struct btrfs_device so that we don't have to call lookup_bdev() again.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Anand Jain 2022-01-12 13:06:01 +08:00 • committed by David Sterba
parent 16cab91a0c
commit 4889bc05a9
3 changed files with 23 additions and 25 deletions
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3
fs/btrfs/dev-replace.c
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@ -303,6 +303,9 @@ static int btrfs_init_dev_replace_tgtdev(struct btrfs_fs_info *fs_info,
goto error;
}
rcu_assign_pointer(device->name, name);
ret = lookup_bdev(device_path, &device->devt);
if (ret)
goto error;
set_bit(BTRFS_DEV_STATE_WRITEABLE, &device->dev_state);
device->generation = 0;