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function timestamp:string() {
printf("[%012ld]\t", jiffies());
}
// Filesystem level (ext4)
probe module("ext4").function("ext4_issue_discard") {
timestamp();
printf("ext4_issue_discard dev=%s block_group=%u cluster=%d count=%d (=> *8 nr_sects=%d)\n",
bdevname($sb->s_bdev),
$block_group, $cluster, $count, $count * 8);
}
// Block-Device level (disk-mapper)
probe kernel.function("blkdev_issue_discard") {
timestamp();
printf("blkdev_issue_discard dev=%s sector=%u nr_sects=%u\n",
bdevname($bdev), $sector, $nr_sects);
}
// SCSI-Command
probe scsi.iodispatching {
// drivers/scsi/sd.c:scsi_setup_discard_cmnd()
if ($cmd->cmd_len >= 16
&& $cmd->cmnd[0] == 0x93 /* WRITE_SAME_16 */
&& $cmd->cmnd[1] == 0x08 /* UNMAP */) {
timestamp();
printf("SCSI [WRITE_SAME_16, UNMAP, sector, count] ");
sector = ( ($cmd->cmnd[2] << 56) +
($cmd->cmnd[3] << 48) +
($cmd->cmnd[4] << 40) +
($cmd->cmnd[5] << 32) +
($cmd->cmnd[6] << 24) +
($cmd->cmnd[7] << 16) +
($cmd->cmnd[8] << 8) +
($cmd->cmnd[9]) );
// Substract partition start position (fdisk: 22464512) + Crypto overhead (4096 sectors)
sector = sector - 22468608;
// Number of sectors (count)
nr_sects = ( ($cmd->cmnd[10] << 24) +
($cmd->cmnd[11] << 16) +
($cmd->cmnd[12] << 8) +
($cmd->cmnd[13]) );
printf("state=%s direction=%s dev=%u:%u:%u:%u sector=%u nr_sects=%u\n",
device_state_str, data_direction_str, host_no, channel, lun, dev_id,
sector, nr_sects);
}
}
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