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zdsfs: coordinated read access

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For data consistency it is essential that datasets are not modified by
z/OS applications during zdsfs access. This is currently ensured by
manually setting the device offline in z/OS before mounting it in Linux.

This patch improves the usability and data security by making this manual
step obsolete.
Before opening a dataset zdsfs will obtain an ENQ to mark it as in use for
z/OS and release the ENQ when closing the dataset.
A timer is set up that pings the z/OSMF REST services with the ENQ to
prevent it from a timeout after 10 minutes.
The behavior of zdsfs can be configured in a new config file or with new
command line options.

Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
Reviewed-by: Niklas Schnelle <schnelle@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
This commit is contained in:
Stefan Haberland
2020-07-28 16:43:45 +02:00
committed by Jan Höppner
parent b044aec4ff
commit 5737a57920
2 changed files with 284 additions and 2 deletions
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2
include/lib/libzds.h
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@@ -192,7 +192,7 @@
#define MAX_LINE_LENGTH 512
#define MAX_SERVER 3
/**
* @brief This structure represents the count field in an ECKD record.