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btrfs: print process name and pid that calls device scanning

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Its very helpful if we had logged the device scanner process name to
debug the race condition between the systemd-udevd scan and the user
initiated device forget command.

This patch adds process name and pid to the scan message.

Signed-off-by: Anand Jain <anand.jain@oracle.com>
Reviewed-by: David Sterba <dsterba@suse.com>
[ add pid to the message ]
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Anand Jain 2019-10-02 18:30:48 +08:00 committed by David Sterba
parent 725af92a62
commit aa6c0df73e
1 changed files with 8 additions and 4 deletions
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12
fs/btrfs/volumes.c
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@ -1005,11 +1005,15 @@ static noinline struct btrfs_device *device_list_add(const char *path,
*new_device_added = true;
if (disk_super->label[0])
pr_info("BTRFS: device label %s devid %llu transid %llu %s\n",
disk_super->label, devid, found_transid, path);
pr_info(
"BTRFS: device label %s devid %llu transid %llu %s scanned by %s (%d)\n",
disk_super->label, devid, found_transid, path,
current->comm, task_pid_nr(current));
else
pr_info("BTRFS: device fsid %pU devid %llu transid %llu %s\n",
disk_super->fsid, devid, found_transid, path);
pr_info(
"BTRFS: device fsid %pU devid %llu transid %llu %s scanned by %s (%d)\n",
disk_super->fsid, devid, found_transid, path,
current->comm, task_pid_nr(current));
} else if (!device->name || strcmp(device->name->str, path)) {
/*