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author | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2010-11-02 09:58:49 -0400 |
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committer | Mark Brown <broonie@opensource.wolfsonmicro.com> | 2010-11-02 09:58:49 -0400 |
commit | 9e3be1edbe5ca57df51140b523168237b3a01f4d (patch) | |
tree | a72c0ec1ce0fbcdcd12ecb6aad9bedcc94b94f9d /Documentation/scsi/st.txt | |
parent | ASoC: Fix SND_SOC_ALL_CODECS typo for alc5623 (diff) | |
parent | Merge commit 'v2.6.37-rc1' into for-2.6.37 (diff) | |
download | linux-dev-9e3be1edbe5ca57df51140b523168237b3a01f4d.tar.xz linux-dev-9e3be1edbe5ca57df51140b523168237b3a01f4d.zip |
Merge branch 'for-2.6.37' into HEAD
WARN() fix from Joe moved.
Conflicts:
sound/soc/codecs/wm_hubs.c
Diffstat (limited to 'Documentation/scsi/st.txt')
-rw-r--r-- | Documentation/scsi/st.txt | 15 |
1 files changed, 14 insertions, 1 deletions
diff --git a/Documentation/scsi/st.txt b/Documentation/scsi/st.txt index 40752602c050..691ca292c24d 100644 --- a/Documentation/scsi/st.txt +++ b/Documentation/scsi/st.txt @@ -2,7 +2,7 @@ This file contains brief information about the SCSI tape driver. The driver is currently maintained by Kai Mäkisara (email Kai.Makisara@kolumbus.fi) -Last modified: Sun Feb 24 21:59:07 2008 by kai.makisara +Last modified: Sun Aug 29 18:25:47 2010 by kai.makisara BASICS @@ -85,6 +85,17 @@ writing and the last operation has been a write. Two filemarks can be optionally written. In both cases end of data is signified by returning zero bytes for two consecutive reads. +Writing filemarks without the immediate bit set in the SCSI command block acts +as a synchronization point, i.e., all remaining data form the drive buffers is +written to tape before the command returns. This makes sure that write errors +are caught at that point, but this takes time. In some applications, several +consecutive files must be written fast. The MTWEOFI operation can be used to +write the filemarks without flushing the drive buffer. Writing filemark at +close() is always flushing the drive buffers. However, if the previous +operation is MTWEOFI, close() does not write a filemark. This can be used if +the program wants to close/open the tape device between files and wants to +skip waiting. + If rewind, offline, bsf, or seek is done and previous tape operation was write, a filemark is written before moving tape. @@ -301,6 +312,8 @@ MTBSR Space backward over count records. MTFSS Space forward over count setmarks. MTBSS Space backward over count setmarks. MTWEOF Write count filemarks. +MTWEOFI Write count filemarks with immediate bit set (i.e., does not + wait until data is on tape) MTWSM Write count setmarks. MTREW Rewind tape. MTOFFL Set device off line (often rewind plus eject). |