[PATCH] dm: add module parameter bdev_wait
From: Mark-PK Tsai <mark-pk.tsai@mediatek.com>
Date: 2021-10-22 06:47:58
Also in:
dm-devel, linux-mediatek, lkml
Subsystem:
device-mapper (lvm), the rest · Maintainers:
Alasdair Kergon, Mike Snitzer, Mikulas Patocka, Benjamin Marzinski, Linus Torvalds
dm_early_create() fail if the target block device not found in the late init stage. The block device is created in mmc_rescan() which kernel do it async by queue it into system_freezable_wq. Add module param bdev_wait to support waiting the block device ready before dm_early_create() like prepare_namespace() does. Signed-off-by: Mark-PK Tsai <mark-pk.tsai@mediatek.com> --- drivers/md/dm-init.c | 11 +++++++++++ 1 file changed, 11 insertions(+)
diff --git a/drivers/md/dm-init.c b/drivers/md/dm-init.c
index b0c45c6ebe0b..a3d24cafa4f4 100644
--- a/drivers/md/dm-init.c
+++ b/drivers/md/dm-init.c@@ -8,11 +8,13 @@ */ #include <linux/ctype.h> +#include <linux/delay.h> #include <linux/device.h> #include <linux/device-mapper.h> #include <linux/init.h> #include <linux/list.h> #include <linux/moduleparam.h> +#include <linux/mount.h> #define DM_MSG_PREFIX "init" #define DM_MAX_DEVICES 256
@@ -20,6 +22,7 @@ #define DM_MAX_STR_SIZE 4096 static char *create; +static char *bdev_wait; /* * Format: dm-mod.create=<name>,<uuid>,<minor>,<flags>,<table>[,<table>+][;<name>,<uuid>,<minor>,<flags>,<table>[,<table>+]+]
@@ -286,6 +289,12 @@ static int __init dm_init_init(void) DMINFO("waiting for all devices to be available before creating mapped devices"); wait_for_device_probe(); + if (bdev_wait) { + DMINFO("Waiting for block device %s...", bdev_wait); + while (!name_to_dev_t(bdev_wait)) + msleep(5); + } + list_for_each_entry(dev, &devices, list) { if (dm_early_create(&dev->dmi, dev->table, dev->target_args_array))
@@ -301,3 +310,5 @@ late_initcall(dm_init_init); module_param(create, charp, 0); MODULE_PARM_DESC(create, "Create a mapped device in early boot"); +module_param(bdev_wait, charp, 0); +MODULE_PARM_DESC(bdev_wait, "Wait until the block device ready before dm_early_create");
--
2.18.0
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