+++ /dev/null
-
-The upper level amanda code (including some of the other tape_xxx
-routines) calls the following routines which implement a virtual
-tape table:
- int tape_access(filename, mode)
- Acts like access(2) on possibly virtual devices
- int tape_open(filename, mode)
- Acts like open(2) on possibly virtual devices
- int tape_stat(filename, buf)
- Acts like stat(2) on possibly virtual devices
- int tapefd_close(tapefd)
- Acts like close(2) on possibly virtual devices
- int tapefd_fsf(tapefd, count)
- Forward skips the (possibly virtual) device.
- int tapefd_read(tapefd, buffer, count)
- Reads a block from the (possibly virtual) device.
- int tapefd_rewind(tapefd)
- Reads a block from a (possibly virtual) device.
- void tapefd_resetofs(tapefd)
- Uses lseek() tricks to reset the write/read offset counter on
- a virtual tape device.
- int tapefd_unload(tapefd)
- Unloads the media from a (possibly virtual) device.
- int tapefd_status(tapefd)
- prints status of the (possibly virtual) device to standard output.
- int tapefd_weof(tapefd, count)
- writes a filemark/moves to the next file on a device for writing.
- int tapefd_write(tapefd, buffer, count)
- writes a block of data to a (possibly virtual) device.
-
-For a tape type xxx, the following routines must be provided, and
-entered into the table "vtable" in tape-src/tapeio.c:
- int xxx_tape_access(filename, mode)
- int xxx_tape_open(filename, mode)
- int xxx_tape_stat(filename, buf)
- int xxx_tapefd_close(xxx_tapefd)
- int xxx_tapefd_fsf(xxx_tapefd, count)
- int xxx_tapefd_read(xxx_tapefd, buffer, count)
- int xxx_tapefd_rewind(xxx_tapefd)
- void xxx_tapefd_resetofs(xxx_tapefd)
- int xxx_tapefd_unload(xxx_tapefd)
- int xxx_tapefd_status(xxx_tapefd)
- int xxx_tapefd_weof(xxx_tapefd, count)
- int xxx_tapefd_write(xxx_tapefd, buffer, count)
-
-Along with a prefix string which will identify the type. The initial
-vtape layer has two types "plain" and "rait" (Redundant Array of
-Inexpensive Tapes) but we hope to add a "rmt" (remote tape client),
-and possibly "dvd" types soon.