[RFC PATCH 6/7] qemu-option: add I/O hang timeout option

[Ying Fang <fangying1@huawei.com>]

I/O hang timeout should be different under different situations. So it is
better to provide an option for user to determine I/O hang timeout for
each block device.

Signed-off-by: Jiahui Cen <cenjiahui@huawei.com>
Signed-off-by: Ying Fang <fangying1@huawei.com>
---
 blockdev.c | 11 +++++++++++
 1 file changed, 11 insertions(+)

diff --git a/blockdev.c b/blockdev.c
index 7f2561081e..ff8cdcd497 100644
--- a/blockdev.c
+++ b/blockdev.c
@@ -500,6 +500,7 @@ static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
     BlockdevDetectZeroesOptions detect_zeroes =
         BLOCKDEV_DETECT_ZEROES_OPTIONS_OFF;
     const char *throttling_group = NULL;
+    int64_t iohang_timeout = 0;
 
     /* Check common options by copying from bs_opts to opts, all other options
      * stay in bs_opts for processing by bdrv_open(). */
@@ -622,6 +623,12 @@ static BlockBackend *blockdev_init(const char *file, QDict *bs_opts,
 
         bs->detect_zeroes = detect_zeroes;
 
+        /* init timeout value for I/O Hang */
+        iohang_timeout = qemu_opt_get_number(opts, "iohang-timeout", 0);
+        if (iohang_timeout > 0) {
+            blk_iohang_init(blk, iohang_timeout);
+        }
+
         block_acct_setup(blk_get_stats(blk), account_invalid, account_failed);
 
         if (!parse_stats_intervals(blk_get_stats(blk), interval_list, errp)) {
@@ -3786,6 +3793,10 @@ QemuOptsList qemu_common_drive_opts = {
             .type = QEMU_OPT_BOOL,
             .help = "whether to account for failed I/O operations "
                     "in the statistics",
+        },{
+            .name = "iohang-timeout",
+            .type = QEMU_OPT_NUMBER,
+            .help = "timeout value for I/O Hang",
         },
         { /* end of list */ }
     },
-- 
2.23.0