DOS Attributes Support

In order to completely support SMB service, Sun QFS has to support certain file attributes. These attributes can be set and cleared by the owner of a file or a user or a group that has been granted the permission using the write_attributes ACE permission.

The following table lists the file attributes that are supported in the Sun OFS file system.

Table 8-1 File Attributes Supported in the Sun QFS File System

Attribute	Description
`appendonly`	Marks a file so that is can only be appended to.
`archive`	Marks files for archiving. It is set when a file is created or modified. This attribute is currently not used by SAM-QFS.
`createtime`	Timestamp when a file is created. The owner of the file or any user with `write_attributes` permission can modify this value to any time.
`hidden`	Marks a file as hidden. The file appears transparent in a Windows system.
`immutable`	Prevents the content of a file from being modified or deleted. Also, prevents all metadata changes except for access time updates. When this attribute is placed on a directory, it will prevent the deletion and creation of files and directories. All attempts to modify the content of a file or directory marked as immutable will fail with an error. All attempts to modify any attributes (with the exception of access time) of a file marked as immutable will fail with an error.
`nodump`	Oracle Solaris systems have no special semantics for this attribute.
`nounlink`	Prevents a file from being deleted. On a directory, the attribute will also prevent any changes to the contents of the directory. That is, no files within the directory can be removed or renamed. All attempts to unlink or rename files and directories that are marked as `nounlink` will return an error.
`offline`	Indicates whether a file is offline. If a file is released in the SAM-QFS file system, then the offline attribute is set. Windows systems will not attempt to preview files that have this attribute set.
`readonly`	Marks a file as readonly. Once a file is marked as readonly, the content data of the file cannot be modified. Other metadata for the file can still be modified. This attribute can be set on directories but it has no semantic meaning. All attempts to modify the content of the file will return an error.
`sparse`	Available to users and applications to indicate that a file can be interpreted as sparse. It does not indicate whether the file is actually sparse and it has no special semantics on the Oracle Solaris OS. The sparse attribute will be cleared if the file is truncated to zero length.
`system`	Marker for special files on Windows systems.

Example 8-1 Viewing System Attributes Using the ls Command

You can use the ls command to view the attributes of a SAM-QFS file. For example:

# ls -/v file1
-rw-r--r--   1 root root  40560 Jun 28 11:54 file1 
{archive,nohidden,noreadonly,nosystem,noappendonly,
nonodump,noimmutable,nonounlink,nooffline,sparse}

For more information about the ls command, see the ls(1) man page.

Example 8-2 Modifying System Attributes Using the chmod Command

You can use the chmod command to modify the system attributes of a SAM-QFS file. For example, to modify a file to be read-only:

# chmod S+vreadonly file2
# ls -/v file2
-rw-r--r--   1 root     root          12 Jun 28 11:56 file2
{noarchive,nohidden,readonly,nosystem,noappendonly,
nonodump,noimmutable,nonounlink,offline,nosparse}

For more information about the chmod command, see the chmod(1) man page.

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