[Bug 198301] ext4 fails to create symlink if target length is greater than block size (but smaller than PATH_MAX)

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https://bugzilla.kernel.org/show_bug.cgi?id=198301

Eric Biggers (ebiggers3@gmail.com) changed:

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--- Comment #7 from Eric Biggers (ebiggers3@gmail.com) ---
> 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.

Note that you cannot necessarily link to every file in the filesystem even with
a 4k block size, since the absolute path to a file can be over PATH_MAX. 
PATH_MAX is a limit on the path string passed to syscalls, not a limit on the
directory structure.  By using cwd-relative paths, fd-relative paths, chroots,
or bind mounts, you can create a directory structure that is much deeper than
PATH_MAX.  None of the major Linux filesystems enforce a directory depth limit,
as far as I know -- and even if one did, it could still be mounted at a
mountpoint whose absolute path is already PATH_MAX, or close to it.

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