+++ /dev/null
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->File System Table</TITLE
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-TITLE="Mount Table"
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-><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"
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-><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
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