[linux-lvm] Re: [RFC] Reverting "bd_mount_mutex" to "bd_mount_sem"
mingo at elte.hu
Wed Sep 27 13:57:05 UTC 2006
* Srinivasa Ds <srinivasa at in.ibm.com> wrote:
> On debugging I found out that,"dmsetup suspend <device name>" calls
> "freeze_bdev()",which locks "bd_mount_mutex" to make sure that no new
> mounts happen on bdev until thaw_bdev() is called.
> This "thaw_bdev()" is getting called when we resume the device
> through "dmsetup resume <device-name>".
> Hence we have 2 processes,one of which locks
> "bd_mount_mutex"(dmsetup suspend) and Another(dmsetup resume) unlocks
hm, to me this seems quite a fragile construct - even if the
mutex-debugging warning is worked around by reverting to a semaphore.
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