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Full Discussion: Normal LOFS behaviour?
Operating Systems Solaris Normal LOFS behaviour? Post 302300033 by blowtorch on Monday 23rd of March 2009 03:44:34 AM
Old 03-23-2009
Normal LOFS behaviour?

I've got one directory LOFS mounted on top of another (this is to help move from an older standard that we used to follow to a newer one that we will be).

Something like this:

Code:
bash-3.00# df -k | grep /x
/dev/md/dsk/d4       77449687   88172 76587019     1%    /x
/x                  77449687   88172 76587019     1%    /app

Now,
Code:
bash-3.00# cd /x
bash-3.00# ls
ControlMagent6.2  admin             home              oracle
InfraData         dbatools          lost+found
bash-3.00# cd /app
bash-3.00# ls
ControlMagent6.2  admin             home              oracle
InfraData         dbatools          lost+found

which is fine.
But,
Code:
bash-3.00# cd /app/dbatools
bash-3.00# ls
DBE_DBATOOLS  lost+found    open_client
bash-3.00# cd /x/dbatools
bash-3.00# ls
bash-3.00#

The thing to note here is that /app/dbatools is a separate filesystem as opposed to just being a directory.
Code:
bash-3.00# df -k /app/dbatools
Filesystem            kbytes    used   avail capacity  Mounted on
/dev/vx/dsk/oracle_locdg/dbatools
                     9437184  571386 8311701     7%    /app/dbatools

The DBAs have scripts that are referring to /x/dbatools and expecting to find other scripts/commands to execute under that directory, and the lack of any directory structure under /x/dbatools is causing them to fail.

Is this normal behaviour for LOFS mounted filesystems? If I mount x on top of y, and create a mountpoint z that uses x as part of the directory name, will I not be able to access the mountpoint z by using y as part of the directory name?
 

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LIBBASH(7)							  libbash Manual							LIBBASH(7)

NAME
libbash -- A bash shared libraries package. DESCRIPTION
libbash is a package that enables bash dynamic-like shared libraries. Actually its a tool for managing bash scripts whose functions you may want to load and use in scripts of your own. It contains a 'dynamic loader' for the shared libraries ( ldbash(1)), a configuration tool (ldbashconfig(8)), and some libraries. Using ldbash(1) you are able to load loadable bash libraries, such as getopts(1) and hashstash(1). A bash shared library that can be loaded using ldbash(1) must answer 4 requirments: 1. It must be installed in $LIBBASH_PREFIX/lib/bash (default is /usr/lib/bash). 2. It must contain a line that begins with '#EXPORT='. That line will contain (after the '=') a list of functions that the library exports. I.e. all the function that will be usable after loading that library will be listed in that line. 3. It must contain a line that begins with '#REQUIRE='. That line will contain (after the '=') a list of bash libraries that are required for our library. I.e. every bash library that is in use in our bash library must be listed there. 4. The library must be listed (For more information, see ldbashconfig(8)). Basic guidelines for writing library of your own: 1. Be aware, that your library will be actually sourced. So, basically, it should contain (i.e define) only functions. 2. Try to declare all variables intended for internal use as local. 3. Global variables and functions that are intended for internal use (i.e are not defined in '#EXPORT=') should begin with: __<library_name>_ For example, internal function myfoosort of hashstash library should be named as __hashstash_myfoosort This helps to avoid conflicts in global name space when using libraries that come from different vendors. 4. See html manual for full version of this guide. AUTHORS
Hai Zaar <haizaar@haizaar.com> Gil Ran <ril@ran4.net> SEE ALSO
ldbash(1), ldbashconfig(8), getopts(1), hashstash(1) colors(1) messages(1) urlcoding(1) locks(1) Linux Epoch Linux
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