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Operating Systems Solaris Neat trick: Changing the permissions of an underlying mount point Post 302358300 by Smiling Dragon on Friday 2nd of October 2009 04:10:18 AM
Old 10-02-2009
Quote:
Originally Posted by jim mcnamara
So, the file system "does not care", but chmod is doing some kind of check to prevent working directly on a mountpoint. Does this work for all filesystems? You see can why I ask - who would bother to code chmod to "care" otherwise. There must be a gotcha somewhere.
I suspect I am misunderstanding your question but in case I do have you right, the chmod isn't really caring or not caring - it's just working on what it sees, as the second mount of the same filesystem wouldn't have anything mounted on top of any mount points underneath it.
So that allows one to 'see' the directory that would normally be obscured by the root of the mounted FS.
 

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MOUNT_MSDOS(8)						    BSD System Manager's Manual 					    MOUNT_MSDOS(8)

NAME
mount_msdos -- mount an MS-DOS file system SYNOPSIS
mount_msdos [-o options] [-u uid] [-g gid] [-m mask] special node DESCRIPTION
The mount_msdos command attaches the MS-DOS filesystem residing on the device special to the global filesystem namespace at the location indicated by node. This command is normally executed by mount(8) at boot time, but can be used by any user to mount an MS-DOS file system on any directory that they own (provided, of course, that they have appropriate access to the device that contains the file system). The options are as follows: -o options Use the specified mount options, as described in mount(8). -u uid Set the owner of the files in the file system to uid. The default owner is the owner of the directory on which the file system is being mounted. -g gid Set the group of the files in the file system to gid. The default group is the group of the directory on which the file system is being mounted. -m mask Specify the maximum file permissions for files in the file system. (For example, a mask of 755 specifies that, by default, the owner should have read, write, and execute permissions for files, but others should only have read and execute permissions. See chmod(1) for more information about octal file modes.) Only the nine low-order bits of mask are used. The default mask is taken from the directory on which the file system is being mounted. SEE ALSO
mount(2), unmount(2), fstab(5), mount(8) CAVEATS
FreeBSD 2.1 and earlier versions could not handle cluster sizes larger than 16K. Just mounting an MS-DOS file system could cause corruption to any mounted file system. Cluster sizes larger than 16K are unavoidable for file system sizes larger than 1G, and also occur when filesys- tems larger than 1G are shrunk to smaller than 1G using FIPS. HISTORY
The mount_msdos utility first appeared in FreeBSD 2.0. Its predecessor, the mount_pcfs utility appeared in FreeBSD 1.0, and was abandoned in favor of the more aptly-named mount_msdos. BSD
April 7, 1994 BSD
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