Re: very low performance on SCSI disks if device node is in tmpfs

[Linus Torvalds]

On Tue, 25 May 2004, Andrew Morton wrote:
>
> We need to set file->f_ra _after_ calling blkdev_open(), when inode->i_mapping
> points at the right thing.  And we need to get it from
> inode->i_mapping->host->i_mapping too, which represents the underlying device.

Hmm.. Is f_mapping is guaranteed to be non-NULL? At least for the O_DIRECT 
case, we explicitly test for f_mapping being non-NULL, although that test 
is quite possibly bogus. Maybe we should fix that too?

		Linus
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