Bug 735552
| Summary: | mount -n no longer works | ||
|---|---|---|---|
| Product: | [Fedora] Fedora | Reporter: | Bill C. Riemers <briemers> |
| Component: | util-linux | Assignee: | Karel Zak <kzak> |
| Status: | CLOSED DUPLICATE | QA Contact: | Fedora Extras Quality Assurance <extras-qa> |
| Severity: | unspecified | Docs Contact: | |
| Priority: | unspecified | ||
| Version: | 15 | CC: | jonathan, kzak |
| Target Milestone: | --- | ||
| Target Release: | --- | ||
| Hardware: | Unspecified | ||
| OS: | Unspecified | ||
| Whiteboard: | |||
| Fixed In Version: | Doc Type: | Bug Fix | |
| Doc Text: | Story Points: | --- | |
| Clone Of: | Environment: | ||
| Last Closed: | 2011-09-03 13:21:40 UTC | Type: | --- |
| Regression: | --- | Mount Type: | --- |
| Documentation: | --- | CRM: | |
| Verified Versions: | Category: | --- | |
| oVirt Team: | --- | RHEL 7.3 requirements from Atomic Host: | |
| Cloudforms Team: | --- | Target Upstream Version: | |
| Embargoed: | |||
*** This bug has been marked as a duplicate of bug 735551 *** |
Description of problem: I have a number of bind mounts I create on my system with an autofs script. Since these mounts are not interesting to view when I run a df command or such, I use the -n option in the scripts that create these mounts. I've been using these same scripts since Fedora Core 6. I was surprised to find when I ran my df command on Fedora 15 all mount autofs bind mounts were appearing. There were also many system created /dev and /sys mounts that normally should not show-up. After investigating I found the problem is that /etc/mtab is now a symbolic link to /proc/mounts. This trick is fine on a minimal install environment like a live CD or such. However, on a full install I don't expect the system to trade away functionality just to save a few kilobytes. Version-Release number of selected component (if applicable): $ rpm -q --whatprovides /etc/mtab util-linux-2.19.1-1.4.fc15.x86_64 How reproducible: 100% Steps to Reproduce: 1. mkdir /home2 2. mount -n -o bind /home /home2 3. df -a |grep home Actual results: $ df -a |grep /home 92891128 74916636 13256540 85% /home 92891128 74916636 13256540 85% /home2 Expected results: $ df -a |grep /home 92891128 74916636 13256540 85% /home Additional info: The manual page for mount has the following to say about replacing /etc/mtab with a symlink /proc/mounts. Note particularly the phrase a number of things won't work... When the proc filesystem is mounted (say at /proc), the files /etc/mtab and /proc/mounts have very similar contents. The for‐ mer has somewhat more information, such as the mount options used, but is not necessarily up-to-date (cf. the -n option below). It is possible to replace /etc/mtab by a symbolic link to /proc/mounts, and especially when you have very large numbers of mounts things will be much faster with that symlink, but some information is lost that way, and in particular using the "user" option will fail.