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init: wait for asynchronously scanned block devices

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Some buses (e.g.  USB and MMC) do their scanning of devices in the
background, causing a race between them and prepare_namespace().  In order
to be able to use these buses without an initrd, we now wait for the device
specified in root= to actually show up.

If the device never shows up than we will hang in an infinite loop.  In
order to not mess with setups that reboot on panic, the feature must be
turned on via the command line option "rootwait".

[[email protected]: root_wait can become static]
Signed-off-by: Pierre Ossman <[email protected]>
Cc: Al Viro <[email protected]>
Cc: Christoph Hellwig <[email protected]>
Signed-off-by: Adrian Bunk <[email protected]>
Signed-off-by: Andrew Morton <[email protected]>
Signed-off-by: Linus Torvalds <[email protected]>
This commit is contained in:
Pierre Ossman 2007-07-15 23:40:35 -07:00 • committed by Linus Torvalds
commit cc1ed7542c
2 changed files with 26 additions and 2 deletions
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4
Documentation/kernel-parameters.txt
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@ -1504,6 +1504,10 @@ and is between 256 and 4096 characters. It is defined in the file
rootfstype= [KNL] Set root filesystem type
rootwait [KNL] Wait (indefinitely) for root device to show up.
Useful for devices that are detected asynchronously
(e.g. USB and MMC devices).
rw [KNL] Mount root device read-write on boot
S [KNL] Run init in single mode