cvs commit: src/sys/kern vfs_bio.c vfs_mount.c

[Remko Lodder]

Warner Losh wrote:
> imp         2007-12-27 16:38:29 UTC
> 
>   FreeBSD src repository
> 
>   Modified files:
>     sys/kern             vfs_bio.c vfs_mount.c 
>   Log:
>   A partial solution to some of the 'pull the umass device with a
>   mounted FS' problems.  These are more along the lines of 'avoiding an
>   avoidable panic' than a complete solution to removable devices.  We
>   now close the barn door after the horse has gotten lose and has been
>   hit by a truck, as it were.  The barn no longer catches fire in this
>   case, but the horse is still dead :-).
>   
>   The vfs_bio.c fix causes us not to put a failed write back into the
>   dirty pool if the error returned was ENXIO.  In that case, the buffer
>   is treated like any other clean buffer that's being retured.  ENXIO
>   means the device isn't there anymore and will never be there again in
>   the future, so retrying is futile.
>   
>   The vfs_mount.c fix treats 'ENXIO' as success for unmounting a file
>   system.  If the device is gone, retrying later won't help and we'll
>   never be able to unmount the device.
>   
>   These two are part of a larger patch set submitted by the author.  The
>   other patches will be forth coming.  I added comments to these two
>   patches.
>   
>   Submitted by: Henrik Gulbrandsen
>   Reviewed by: phk@
>   PR: usb/46176 (partial)
>   
>   Revision  Changes    Path
>   1.531     +4 -0      src/sys/kern/vfs_bio.c
>   1.269     +7 -2      src/sys/kern/vfs_mount.c

Hurray!

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