From mboxrd@z Thu Jan 1 00:00:00 1970
From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 105121] New: lseek() hangs for a long time on allocated files
Date: Mon, 28 Sep 2015 12:27:05 +0000
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https://bugzilla.kernel.org/show_bug.cgi?id=105121
Bug ID: 105121
Summary: lseek() hangs for a long time on allocated files
Product: File System
Version: 2.5
Kernel Version: 4.2.1
Hardware: All
OS: Linux
Tree: Mainline
Status: NEW
Severity: normal
Priority: P1
Component: ext4
Assignee: fs_ext4@kernel-bugs.osdl.org
Reporter: iam@valdikss.org.ru
Regression: No
Created attachment 188751
--> https://bugzilla.kernel.org/attachment.cgi?id=188751&action=edit
lseek test program
lseek() call hangs for a long time on fallocate allocated files on ext4.
Steps to reproduce:
1. gcc -o prog lseek-fallocate.c
2. fallocate -l 1G test
3. cat test > /dev/null
4. ./prog
Actual result:
prog hangs for 2 minutes on my system while doing lseek().
Expected result:
lseek() instantly return ENXIO.
Usually lseek works much faster if file wasn't cat'ed before lseek.
Works properly on btrfs.
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