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authorNitin Gupta <ngupta@vflare.org>2010-05-17 09:32:42 +0400
committerGreg Kroah-Hartman <gregkh@suse.de>2010-05-19 02:07:52 +0400
commitb27256439568950f30864ccecaeb6dfb588089d5 (patch)
tree03aaf3a415b65d5f8aa4eefb06f4cddaeb00f4b5 /include/linux/swap.h
parentf4a68b9388c7f647ba2fd43faf69cad26ca03206 (diff)
downloadlinux-b27256439568950f30864ccecaeb6dfb588089d5.tar.xz
swap: Add flag to identify block swap devices
Added SWP_BLKDEV flag to distinguish block and regular file backed swap devices. We could also check if a swap is entire block device, rather than a file, by: S_ISBLK(swap_info_struct->swap_file->f_mapping->host->i_mode) but, I think, simply checking this flag is more convenient. Signed-off-by: Nitin Gupta <ngupta@vflare.org> Acked-by: Linus Torvalds <torvalds@linux-foundation.org> Acked-by: Nigel Cunningham <nigel@tuxonice.net> Acked-by: Pekka Enberg <penberg@cs.helsinki.fi> Reviewed-by: Minchan Kim <minchan.kim@gmail.com> Signed-off-by: Greg Kroah-Hartman <gregkh@suse.de>
Diffstat (limited to 'include/linux/swap.h')
-rw-r--r--include/linux/swap.h1
1 files changed, 1 insertions, 0 deletions
diff --git a/include/linux/swap.h b/include/linux/swap.h
index 1f59d9340c4d..ec2b7a42b45f 100644
--- a/include/linux/swap.h
+++ b/include/linux/swap.h
@@ -146,6 +146,7 @@ enum {
SWP_DISCARDING = (1 << 3), /* now discarding a free cluster */
SWP_SOLIDSTATE = (1 << 4), /* blkdev seeks are cheap */
SWP_CONTINUED = (1 << 5), /* swap_map has count continuation */
+ SWP_BLKDEV = (1 << 6), /* its a block device */
/* add others here before... */
SWP_SCANNING = (1 << 8), /* refcount in scan_swap_map */
};