linux-ext4 - [Bug 105121] lseek(SEEK_DATA) hangs for a long time for sparse files in the page cache

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Date:	Mon, 28 Sep 2015 14:52:14 +0000
From:	bugzilla-daemon@...zilla.kernel.org
To:	linux-ext4@...r.kernel.org
Subject: [Bug 105121] lseek(SEEK_DATA) hangs for a long time for sparse files
 in the page cache

https://bugzilla.kernel.org/show_bug.cgi?id=105121

--- Comment #2 from ValdikSS <iam@...dikss.org.ru> ---
>Out of curiosity, what was the use case that caused you to notice this?

A person was wondering why cat|grep works faster than grep file on usual files
and his test case involved creating file with fallocate and cat it before
grepping. He was apparently used btrfs and had 2 seconds difference while it
hang for me as grep does literally what's in the attached source.

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