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+<HTML
+><HEAD
+><TITLE
+>Initialization and Mounting</TITLE
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+TITLE="File System Support Infrastructure"
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+>eCos Reference Manual</TH
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+><HR
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+WIDTH="100%"></DIV
+><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
+></DIV
+><DIV
+CLASS="NAVFOOTER"
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+SUMMARY="Footer navigation table"
+WIDTH="100%"
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+>
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