On Wed, Apr 27, 2011 at 14:47, Matthew Wilcox wrote: > 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. sorry, wrong question. i misread your original post (suggesting we should be calling fadvise on the block instead of an arbitrary dir handle). -mike -- To unsubscribe from this list: send the line "unsubscribe linux-fsdevel" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
