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+<HTML
+><HEAD
+><TITLE
+>File System Table</TITLE
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+TITLE="File System Support Infrastructure"
+HREF="fileio.html"><LINK
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+TITLE="Introduction"
+HREF="fileio-intro.html"><LINK
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+TITLE="Mount Table"
+HREF="fileio-mount-table.html"></HEAD
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+>eCos Reference Manual</TH
+></TR
+><TR
+><TD
+WIDTH="10%"
+ALIGN="left"
+VALIGN="bottom"
+><A
+HREF="fileio-intro.html"
+ACCESSKEY="P"
+>Prev</A
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+>Next</A
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+><HR
+ALIGN="LEFT"
+WIDTH="100%"></DIV
+><DIV
+CLASS="CHAPTER"
+><H1
+><A
+NAME="FILEIO-FSTAB">Chapter 20. File System Table</H1
+><P
+>The filesystem table is an array of entries that describe each
+filesystem implementation that is part of the system image. Each
+resident filesystem should export an entry to this table using the
+<TT
+CLASS="LITERAL"
+>FSTAB_ENTRY()</TT
+> macro.</P
+><DIV
+CLASS="NOTE"
+><BLOCKQUOTE
+CLASS="NOTE"
+><P
+><B
+>Note: </B
+>At present we do not support dynamic addition or removal of table
+entries. However, an API similar to <TT
+CLASS="FUNCTION"
+>mount()</TT
+> would
+allow new entries to be added to the table.</P
+></BLOCKQUOTE
+></DIV
+><P
+>The table entries are described by the following structure:</P
+><TABLE
+BORDER="5"
+BGCOLOR="#E0E0F0"
+WIDTH="70%"
+><TR
+><TD
+><PRE
+CLASS="PROGRAMLISTING"
+>struct cyg_fstab_entry
+{
+ const char *name; // filesystem name
+ CYG_ADDRWORD data; // private data value
+ cyg_uint32 syncmode; // synchronization mode
+
+ int (*mount) ( cyg_fstab_entry *fste, cyg_mtab_entry *mte );
+ int (*umount) ( cyg_mtab_entry *mte );
+ int (*open) ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
+ int mode, cyg_file *fte );
+ int (*unlink) ( cyg_mtab_entry *mte, cyg_dir dir, const char *name );
+ int (*mkdir) ( cyg_mtab_entry *mte, cyg_dir dir, const char *name );
+ int (*rmdir) ( cyg_mtab_entry *mte, cyg_dir dir, const char *name );
+ int (*rename) ( cyg_mtab_entry *mte, cyg_dir dir1, const char *name1,
+ cyg_dir dir2, const char *name2 );
+ int (*link) ( cyg_mtab_entry *mte, cyg_dir dir1, const char *name1,
+ cyg_dir dir2, const char *name2, int type );
+ int (*opendir) ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
+ cyg_file *fte );
+ int (*chdir) ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
+ cyg_dir *dir_out );
+ int (*stat) ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
+ struct stat *buf);
+ int (*getinfo) ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
+ int key, char *buf, int len );
+ int (*setinfo) ( cyg_mtab_entry *mte, cyg_dir dir, const char *name,
+ int key, char *buf, int len );
+};</PRE
+></TD
+></TR
+></TABLE
+><P
+>The <TT
+CLASS="STRUCTFIELD"
+><I
+>name</I
+></TT
+> field points to a string that
+identifies this filesystem implementation. Typical values might be
+"romfs", "msdos", "ext2" etc.</P
+><P
+>The <TT
+CLASS="STRUCTFIELD"
+><I
+>data</I
+></TT
+> field contains any private data
+that the filesystem needs, perhaps the root of its data structures.</P
+><P
+>The <TT
+CLASS="STRUCTFIELD"
+><I
+>syncmode</I
+></TT
+> field contains a description of
+the locking protocol to be used when accessing this filesystem. It
+will be described in more detail in <A
+HREF="fileio-synchronization.html"
+>Chapter 24</A
+>.</P
+><P
+>The remaining fields are pointers to functions that implement
+filesystem operations that apply to files and directories as whole
+objects. The operation implemented by each function should be obvious
+from the names, with a few exceptions:</P
+><P
+>The <TT
+CLASS="FUNCTION"
+>opendir()</TT
+> function pointer opens a directory
+for reading. See <A
+HREF="fileio-directories.html"
+>Chapter 23</A
+> for details.</P
+><P
+>The <TT
+CLASS="FUNCTION"
+>getinfo()</TT
+> and
+<TT
+CLASS="FUNCTION"
+>setinfo()</TT
+> function pointers provide support for
+various minor control and information functions such as
+<TT
+CLASS="FUNCTION"
+>pathconf()</TT
+> and <TT
+CLASS="FUNCTION"
+>access()</TT
+>.</P
+><P
+>With the exception of the <TT
+CLASS="FUNCTION"
+>mount()</TT
+> and
+<TT
+CLASS="FUNCTION"
+>umount()</TT
+> functions, all of these functions
+take three standard arguments, a pointer to a mount table entry (see
+later) a directory pointer (also see later) and a file name relative
+to the directory. These should be used by the filesystem to locate the
+object of interest.</P
+></DIV
+><DIV
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+SUMMARY="Footer navigation table"
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+>Introduction</TD
+><TD
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+ALIGN="center"
+VALIGN="top"
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+HREF="fileio.html"
+ACCESSKEY="U"
+>Up</A
+></TD
+><TD
+WIDTH="33%"
+ALIGN="right"
+VALIGN="top"
+>Mount Table</TD
+></TR
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+>
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