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From: bugzilla-daemon@bugzilla.kernel.org
Subject: [Bug 198301] New: ext4 fails to create symlink if target length is
 greater than block size (but smaller than PATH_MAX)
Date: Thu, 28 Dec 2017 15:34:27 +0000
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https://bugzilla.kernel.org/show_bug.cgi?id=198301

            Bug ID: 198301
           Summary: ext4 fails to create symlink if target length is
                    greater than block size (but smaller than PATH_MAX)
           Product: File System
           Version: 2.5
    Kernel Version: Confirmed in 4.4.103 & 4.10.0
          Hardware: All
                OS: Linux
              Tree: Mainline
            Status: NEW
          Severity: normal
          Priority: P1
         Component: ext4
          Assignee: fs_ext4@kernel-bugs.osdl.org
          Reporter: ernst@pleiszenburg.de
        Regression: No

If the block size of an ext4 file system is smaller than PATH_MAX, ext4 will
fail to create symlinks to targets with names longer than block size minus one.

Expected result: Symlinks with targets up to a length of PATH_MAX - 1 can be
created.

Actual result: Symlinks with targets up to a length of block size - 1 can be
created. If block size smaller than PATH_MAX, creating symlinks with targets
equal or greater than block size and smaller than PATH_MAX will fail with
ENAMETOOLONG. 

The strange side effect of this bug is that one can not link to every file in a
file system with a block size of e.g. 1k while PATH_MAX is 4k.

For reference, the original test & discussion which triggered this bug:
https://github.com/pjd/pjdfstest/issues/24

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