In this commit: https://git.kernel.org/cgit/linux/kernel/git/torvalds/linux.git/commit/drivers/usb/storage/uas.c?id=198de51dbc3454d95b015ca0a055b673f85f01bb There is the following comment: > 1 tag is reserved for untagged commands So my question is, what exactly are "untagged commands"? If we need to reserve (only) 1 tag for them, does that mean "untagged commands" will never be queued? (I mean, not counting the "tagged commands"; so in the queue there will always be at most 1 "untagged command" and a certain number, or none, of tagged commands?) Also, what determines whether a command is tagged or not? Is it merely depending on how a program (or maybe the kernel) issue the commands? Or can a device (or maybe the driver) require specific SCSI command(s) to always be issued untagged? In any case, is there a way (e.g. a debug option/level of the sd or the uas driver, etc.) to show/log whether the issued commands are tagged or untagged? -- To unsubscribe from this list: send the line "unsubscribe linux-scsi" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
