[Bug 105121] New: lseek() hangs for a long time on allocated files

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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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