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zdsfs: add online vtoc refresh

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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 contained in:
Stefan Haberland
2018-12-11 17:27:34 +01:00
committed by Jan Höppner
parent e9c030f202
commit bc053a975a
6 changed files with 280 additions and 131 deletions
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dasdview/dasdview.c
+1 -1
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@@ -1741,7 +1741,7 @@ static void dasdview_print_vtoc_raw(dasdview_info_t *info)
" rc=%d\n", rc);
exit(-1);
}
rc = lzds_dasd_read_rawvtoc(info->dasd);
rc = lzds_dasd_alloc_rawvtoc(info->dasd);
if (rc == EINVAL) {
zt_error_print("dasdview: Cannot read VTOC because disk does"
" not contain valid VOL1 label.\n",