Chapter 20. file system table, File system table – Comtrol eCos User Manual
Page 417
Chapter 20. File System Table
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
FSTAB_ENTRY()
macro.
Note: At present we do not support dynamic addition or removal of table entries. However, an API similar to
mount()
would allow new entries to be added to the table.
The table entries are described by the following structure:
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 );
};
The
name
field points to a string that identifies this filesystem implementation. Typical values might be "romfs",
"msdos", "ext2" etc.
The
data
field contains any private data that the filesystem needs, perhaps the root of its data structures.
The
syncmode
field contains a description of the locking protocol to be used when accessing this filesystem. It
will be described in more detail in
313