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Bug #6863

lofs mount of single file cannot be opened with O_CREAT

Added by Robert Mustacchi almost 5 years ago. Updated almost 5 years ago.

Status:
Closed
Priority:
Normal
Assignee:
Jerry Jelinek
Category:
filesystems (not ZFS)
Start date:
2016-04-07
Due date:
% Done:

100%

Estimated time:
Difficulty:
Medium
Tags:
Gerrit CR:

Description

The following illustrates how to reproduce this.

If you have a read-only file simulating /etc/shadow (mode 400),
mount -F lofs foo bar,
then try to force write to bar, you get ENOSYS.

If you have the same thing in a directory and lofs mount the
directory instead of the file, you can write to bar.

DTrace shows we're hitting the ENOSYS exit path out of lo_create here.

#1

Updated by Electric Monk almost 5 years ago

  • Status changed from New to Closed

git commit 5ffe84436efb0849931d99235105feb72ae5144d

commit  5ffe84436efb0849931d99235105feb72ae5144d
Author: Jerry Jelinek <jerry.jelinek@joyent.com>
Date:   2016-04-29T07:04:25.000Z

    6863 lofs mount of single file cannot be opened with O_CREAT
    Reviewed by: Patrick Mooney <patrick.mooney@joyent.com>
    Approved by: Richard Lowe <richlowe@richlowe.net>

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