-
- Chapter 27. Virtual Tape API
-Prev Part V. Technical Background Next
-
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-
-Chapter 27. Virtual Tape API
-
-
-Stefan G. Weichinger
-
-XML-conversion
-AMANDA Core Team
-<sgw@amanda.org>
-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) pr- ints 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.
-
-Note
-
-Refer to http://www.amanda.org/docs/vtape-api.html for the current version of
-this document.
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