+++ /dev/null
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-><HEAD
-><TITLE
->Initialization and Mounting</TITLE
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-TITLE="File System Support Infrastructure"
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-TITLE="Synchronization"
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-TITLE="Sockets"
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-><DIV
-CLASS="CHAPTER"
-><H1
-><A
-NAME="FILEIO-MOUNTING">Chapter 25. Initialization and Mounting</H1
-><P
->As mentioned previously, mount table entries can be sourced from two
-places. Static entries may be defined by using the
-<TT
-CLASS="LITERAL"
->MTAB_ENTRY()</TT
-> macro. Such entries will be
-automatically mounted on system startup. For each entry in the mount
-table that has a non-null <TT
-CLASS="STRUCTFIELD"
-><I
->name</I
-></TT
-> field the
-filesystem table is searched for a match with the
-<TT
-CLASS="STRUCTFIELD"
-><I
->fsname</I
-></TT
-> field. If a match is found the
-filesystem's <TT
-CLASS="STRUCTFIELD"
-><I
->mount</I
-></TT
-> entry is called and if
-successful the mount table entry marked valid and the
-<TT
-CLASS="STRUCTFIELD"
-><I
->fs</I
-></TT
-> field initialized. The
-<TT
-CLASS="FUNCTION"
->mount()</TT
-> function is responsible for initializing
-the <TT
-CLASS="STRUCTFIELD"
-><I
->root</I
-></TT
-> field.</P
-><P
->The size of the mount table is defined by the configuration value
-<TT
-CLASS="LITERAL"
->CYGNUM_FILEIO_MTAB_MAX</TT
->. Any entries that have not
-been statically defined are available for use by dynamic mounts.</P
-><P
->A filesystem may be mounted dynamically by calling <TT
-CLASS="FUNCTION"
->mount()</TT
->. This
-function has the following prototype:</P
-><TABLE
-BORDER="5"
-BGCOLOR="#E0E0F0"
-WIDTH="70%"
-><TR
-><TD
-><PRE
-CLASS="PROGRAMLISTING"
->int mount( const char *devname,
- const char *dir,
- const char *fsname);</PRE
-></TD
-></TR
-></TABLE
-><P
->The <TT
-CLASS="PARAMETER"
-><I
->devname</I
-></TT
-> argument identifies a device that
-will be used by this filesystem and will be assigned to the
-<TT
-CLASS="STRUCTFIELD"
-><I
->devname</I
-></TT
-> field of the mount table entry.</P
-><P
->The <TT
-CLASS="PARAMETER"
-><I
->dir</I
-></TT
-> argument is the mount point name, it
-will be assigned to the <TT
-CLASS="STRUCTFIELD"
-><I
->name</I
-></TT
-> field of the
-mount table entry.</P
-><P
->The <TT
-CLASS="PARAMETER"
-><I
->fsname</I
-></TT
-> argument is the name of the
-implementing filesystem, it will be assigned to the
-<TT
-CLASS="STRUCTFIELD"
-><I
->fsname</I
-></TT
-> entry of the mount table entry.</P
-><P
->The process of mounting a filesystem dynamically is as follows. First
-a search is made of the mount table for an entry with a NULL
-<TT
-CLASS="STRUCTFIELD"
-><I
->name</I
-></TT
-> field to be used for the new mount
-point. The filesystem table is then searched for an entry whose name
-matches <TT
-CLASS="STRUCTFIELD"
-><I
->fsname</I
-></TT
->. If this is successful then
-the mount table entry is initialized and the filesystem's
-<TT
-CLASS="FUNCTION"
->mount()</TT
-> operation called. If this is successful,
-the mount table entry is marked valid and the
-<TT
-CLASS="STRUCTFIELD"
-><I
->fs</I
-></TT
-> field initialized.</P
-><P
->Unmounting a filesystem is done by the <TT
-CLASS="FUNCTION"
->umount()</TT
->
-function. This can unmount filesystems whether they were mounted
-statically or dynamically.</P
-><P
->The <TT
-CLASS="FUNCTION"
->umount()</TT
-> function has the following prototype:</P
-><TABLE
-BORDER="5"
-BGCOLOR="#E0E0F0"
-WIDTH="70%"
-><TR
-><TD
-><PRE
-CLASS="PROGRAMLISTING"
->int umount( const char *name );</PRE
-></TD
-></TR
-></TABLE
-><P
->The mount table is searched for a match between the
-<TT
-CLASS="PARAMETER"
-><I
->name</I
-></TT
-> argument and the entry
-<TT
-CLASS="STRUCTFIELD"
-><I
->name</I
-></TT
-> field. When a match is found the
-filesystem's <TT
-CLASS="FUNCTION"
->umount()</TT
-> operation is called and if
-successful, the mount table entry is invalidated by setting its
-<TT
-CLASS="STRUCTFIELD"
-><I
->valid</I
-></TT
-> field false and the
-<TT
-CLASS="STRUCTFIELD"
-><I
->name</I
-></TT
-> field to NULL.</P
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