On Wed, Apr 27, 2011 at 02:39:53PM -0400, Mike Frysinger wrote: > > Mmm ... what if I open /dev/sdxyz and call fadvise() on it? ??I think > > you end up flushing /dev's page cache entries, instead of the filesystem > > which is on /dev/sdxyz. > > i was thinking of that, but was trying to come up with situations > where there might not have a node to work on. fs's in a file go > through loop devs, dm/lvm have ones created, and flash fs's still have > a mtd block. how about network based fs's ? how you going to signal > dropping of pages for nfs or cifs or fuse ones ?
For a regular file, mapping->host->i_sb points to the superblock this file is on. For a device, mapping->host->i_sb points to the superblock corresponding to this device. So it's always what we want. (hm, what about block devices not currently mounted? do we need to check whether mapping->host is NULL?) -- Matthew Wilcox Intel Open Source Technology Centre "Bill, look, we understand that you're interested in selling us this operating system, but compare it to ours. We can't possibly take such a retrograde step." -- To unsubscribe from this list: send the line "unsubscribe linux-api" in the body of a message to [email protected] More majordomo info at http://vger.kernel.org/majordomo-info.html
