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Date: Tue, 25 Jul 2017 00:51:56 -0400 From: Theodore Ts'o <tytso@....edu> To: Pavel Machek <pavel@....cz> Cc: Reindl Harald <h.reindl@...lounge.net>, linux-ext4@...r.kernel.org, kernel list <linux-kernel@...r.kernel.org>, kent.overstreet@...il.com, linux-bcache@...r.kernel.org Subject: Re: bcache with existing ext4 filesystem On Mon, Jul 24, 2017 at 10:04:51PM +0200, Pavel Machek wrote: > Question for you was... Is the first 1KiB of each ext4 filesystem still > free and "reserved for a bootloader"? Yes. > If I needed more for bcache superblock (8KiB, IIRC), would that be > easy to accomplish on existing filesystem? Huh? Why would the bcache superblock matter when you're talking about the ext4 layout? The bcache superblock will be on the bcache device/partition, and the ext4 superblock will be on the ext4 device/partition. - Ted
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