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Updated mountpoint to search for circular mount points when using

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the -p parameter. This works around mountpoint not recognizing
circular mounts where /a/b/c/d and /a/b are the same location
(ie the same device and same inode).
Closes Savannah bug #37114.
This commit is contained in:
Jesse Smith
2018-03-07 16:25:53 -04:00
parent a3f38afc34
commit 8c8172349e
3 changed files with 78 additions and 2 deletions
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13
man/mountpoint.1
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@@ -48,6 +48,19 @@ The name of the command is misleading when the -x option is used,
but the option is useful for comparing if a directory and a device
match up, and there is no other command that can print the info easily.
.PP
The mountpoint command fails when a directory is binded to one of its grandparents.
For example, if /a/b/c/d is a mount point for /a/b then mountpoint will report
/a/b/c/d is not a valid mount point. This is because both the original directory and
its new mount point share the same inode and device number.
.PP
The circular mount problem can be worked around on Linux systems by using
the -p flag to check the /proc/mounts file for references to the circular mount bind.
When using the -p flag, make sure to specify the full path (ie /home/user/mp and
not just mp). Also, mountpoint may still fail if there are spaces in
the mount point's path, even when using the -p flag because of the way
/proc/mounts mangles the spaces in the path name. Of course, if the
admin is using circular mount points with spaces in the name, there
are bigger concerns.
.SH AUTHOR
Miquel van Smoorenburg, miquels@cistron.nl
.SH "SEE ALSO"