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Full Discussion: Set readonly
Top Forums UNIX for Dummies Questions & Answers Set readonly Post 302610927 by daWonderer on Thursday 22nd of March 2012 03:28:25 AM
Old 03-22-2012
Quote:
Originally Posted by Corona688
Setting read-only on a mounted disk tears the floor out from under the operating system, because you're telling the disk itself, not OS, to act in a read-only fashion.
I don't understand.
If a program tries to write on a disk it doesn't call a system function to get if it is writeenabled? why it doesn't check for this disk setting too?

Quote:
I suspect it would cause write-errors much later, not immediate 'permission denied'. That's if it realizes the write failed at all -- if it doesn't, very inexplicable behavior and crashes are probably in the near future when the contents on disk end up having less and less resemblance to what the kernel believes they should
I tested the creation and editing of a file and OS told me the file is there and changed. After restart the file was still there.

I'll check mount to set readonly flag..
 

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LEARN ABOUT V7

quotacheck

quotacheck(1M)						  System Administration Commands					    quotacheck(1M)

NAME

       quotacheck - ufs file system quota consistency checker

SYNOPSIS

       quotacheck [-fp] [-v] filesystem...

       quotacheck -a [-fpv]

DESCRIPTION

       quotacheck  examines  each  mounted  ufs file system, builds a table of current disk usage, and compares this table against the information
       stored in the file system's disk quota file. If any inconsistencies are detected, both the quota file and the current system  copy  of  the
       incorrect quotas are updated.

       filesystem is either a file system mount point or the block device  on which the file system resides.

       quotacheck  expects  each file system to be checked to have a quota file named quotas in the root directory. If none is present, quotacheck
       will not check the file system.

       quotacheck accesses the character special device in calculating the actual disk usage for each  user.  Thus,  the  file	systems  that  are
       checked should be quiescent while quotacheck is running.

OPTIONS

       The following options are supported:

       -a	Check the file systems which /etc/mnttab indicates are ufs file systems.  These file systems must be read-write mounted  with disk
		quotas enabled, and have an rq entry in the mntopts field in /etc/vfstab.

       -f	Force check on file systems with logging enabled. Use in combination with the -p option.

       -p	Check quotas of file systems in parallel. For file systems with logging enabled, no check is performed unless  the  -f	option	is
		also specified.

       -v	Indicate the calculated disk quotas for each user on a particular file system. quotacheck normally reports only those quotas modi-
		fied.

USAGE

       See largefile(5) for the description of the behavior of quotacheck when encountering files greater than or equal to 2 Gbyte ( 2**31 bytes).

FILES

       /etc/mnttab     Mounted file systems

       /etc/vfstab     List of default parameters for each file system

ATTRIBUTES

       See attributes(5) for descriptions of the following attributes:

       +-----------------------------+-----------------------------+
       |      ATTRIBUTE TYPE	     |	    ATTRIBUTE VALUE	   |
       +-----------------------------+-----------------------------+
       |Availability		     |SUNWcsu			   |
       +-----------------------------+-----------------------------+

SEE ALSO

       edquota(1M), quota(1M), quotaon(1M), repquota(1M), attributes(5), largefile(5), quotactl(7I), mount_ufs(1M)

SunOS 5.10							    31 Jul 1998 						    quotacheck(1M)
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