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>
Add library functions that allow to communicate with z/OSMF REST services
using libcurl.
Following three functions are added:
lzds_rest_get_enq()
to obtain an ENQ that will mark a dataset as in use to z/OS until
it is released again
lzds_rest_release_enq()
to release an ENQ and mark a dataset as no longer in use to z/OS
lzds_rest_ping()
to ping a z/OSMF REST server to check if it accessible
or to refresh an ENQ and prevent it from a timeout after 10 minutes
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>
Enable zdsfs to access datasets that were created after zdsfs was
mounted without the need to remount zdsfs.
This is done by re-reading the VTOC with every readdir system call.
To ensure a consistent VTOC state the DASD device is reserved for
every VTOC read and released afterwards.
Signed-off-by: Stefan Haberland <sth@linux.ibm.com>
Reviewed-by: Jan Hoeppner <hoeppner@linux.ibm.com>
Signed-off-by: Jan Höppner <hoeppner@linux.ibm.com>
This commit is based on the s390-tools-1.39.0 version.
Changes on top of s390-tools-1.39.0:
- Add MIT license to all source files
- Add LICENSE file
- Transform REAMDE to README.md (markdown)
- Add AUTHORS.md file
- Add CONTRIBUTING.md file
- Move changelog from README to CHANGELOG.md file
Reviewed-by: Stefan Haberland <sth@linux.vnet.ibm.com>
Signed-off-by: Michael Holzheu <holzheu@linux.vnet.ibm.com>
