* [PATCH v2] md: Explicitly create command-line configured devices
@ 2022-06-01 11:03 Chris Webb
2022-06-01 23:18 ` Song Liu
0 siblings, 1 reply; 2+ messages in thread
From: Chris Webb @ 2022-06-01 11:03 UTC (permalink / raw)
To: Christoph Hellwig, Song Liu, linux-raid
Boot-time assembly of arrays with md= command-line arguments breaks when
CONFIG_BLOCK_LEGACY_AUTOLOAD is unset. md_setup_drive() in md-autodetect.c
calls blkdev_get_by_dev(), assuming this implicitly creates the block
device.
Fix this by attempting to md_alloc() the array first. As in the probe path,
ignore any error as failure is caught by blkdev_get_by_dev() anyway.
Signed-off-by: Chris Webb <chris@arachsys.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
---
v2: Correction from Christoph's review: dropped redundant 'extern' from
md_alloc() prototype in md.h.
drivers/md/md-autodetect.c | 1 +
drivers/md/md.c | 2 +-
drivers/md/md.h | 1 +
3 files changed, 3 insertions(+), 1 deletion(-)
diff --git a/drivers/md/md-autodetect.c b/drivers/md/md-autodetect.c
index 2cf973722f59..344910ba435c 100644
--- a/drivers/md/md-autodetect.c
+++ b/drivers/md/md-autodetect.c
@@ -169,6 +169,7 @@ static void __init md_setup_drive(struct md_setup_args *args)
pr_info("md: Loading %s: %s\n", name, args->device_names);
+ md_alloc(mdev, name);
bdev = blkdev_get_by_dev(mdev, FMODE_READ, NULL);
if (IS_ERR(bdev)) {
pr_err("md: open failed - cannot start array %s\n", name);
diff --git a/drivers/md/md.c b/drivers/md/md.c
index 707e802d0082..5a4bca886572 100644
--- a/drivers/md/md.c
+++ b/drivers/md/md.c
@@ -5638,7 +5638,7 @@ int mddev_init_writes_pending(struct mddev *mddev)
}
EXPORT_SYMBOL_GPL(mddev_init_writes_pending);
-static int md_alloc(dev_t dev, char *name)
+int md_alloc(dev_t dev, char *name)
{
/*
* If dev is zero, name is the name of a device to allocate with
diff --git a/drivers/md/md.h b/drivers/md/md.h
index cf2cbb17acbd..8da7ec314bbf 100644
--- a/drivers/md/md.h
+++ b/drivers/md/md.h
@@ -751,6 +751,7 @@ extern int md_integrity_add_rdev(struct md_rdev *rdev, struct mddev *mddev);
extern int strict_strtoul_scaled(const char *cp, unsigned long *res, int scale);
extern void mddev_init(struct mddev *mddev);
+int md_alloc(dev_t dev, char *name);
extern int md_run(struct mddev *mddev);
extern int md_start(struct mddev *mddev);
extern void md_stop(struct mddev *mddev);
^ permalink raw reply related [flat|nested] 2+ messages in thread
* Re: [PATCH v2] md: Explicitly create command-line configured devices
2022-06-01 11:03 [PATCH v2] md: Explicitly create command-line configured devices Chris Webb
@ 2022-06-01 23:18 ` Song Liu
0 siblings, 0 replies; 2+ messages in thread
From: Song Liu @ 2022-06-01 23:18 UTC (permalink / raw)
To: Chris Webb; +Cc: Christoph Hellwig, linux-raid
On Wed, Jun 1, 2022 at 4:03 AM Chris Webb <chris@arachsys.com> wrote:
>
> Boot-time assembly of arrays with md= command-line arguments breaks when
> CONFIG_BLOCK_LEGACY_AUTOLOAD is unset. md_setup_drive() in md-autodetect.c
> calls blkdev_get_by_dev(), assuming this implicitly creates the block
> device.
>
> Fix this by attempting to md_alloc() the array first. As in the probe path,
> ignore any error as failure is caught by blkdev_get_by_dev() anyway.
>
> Signed-off-by: Chris Webb <chris@arachsys.com>
> Reviewed-by: Christoph Hellwig <hch@lst.de>
Applied to md-next.
Thanks!
Song
^ permalink raw reply [flat|nested] 2+ messages in thread
end of thread, other threads:[~2022-06-01 23:18 UTC | newest]
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2022-06-01 23:18 ` Song Liu
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