On 12/6/17 3:57 PM, Dave Chinner wrote: > There's a *simple answer* to this problem: fix the new command's > output. > > That is: the user asked for a specific range, so the command itself > should trim the map returned by the kernel to only display the exact > range the user asked for. Then it doesn't matter if the underlying > filesystem trims the extents or not, because the we're going to do > that anyway in userspace. I have a different opinion: xfs_io is a debugging tool; the fiemap command sends an ioctl to the kernel. Ranged fiemap queries are a real thing; you put numbers into the kernel, and you get numbers out of the kernel. IMNSO, xfs_io should present to the user /what the kernel returned/, and not re-interpret it to fit some other notion of correctness if we don't like what the kernel told us. If you want to have some user-friendlier behavior where xfs_io layers behaviors on top of what the kernel provides, then add a "-t" argument for trim, but hiding ioctl inconsistencies by filtering them through xfs_io sounds like the wrong approach to me. -Eric -- To unsubscribe from this list: send the line "unsubscribe linux-xfs" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
