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swap_info: include first_swap_extent

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Make better use of the space by folding first swap_extent into its
swap_info_struct, instead of just the list_head: swap partitions need
only that one, and for others it's used as a circular list anyway.

[jirislaby@gmail.com: fix crash on double swapon]
Signed-off-by: Hugh Dickins <hugh.dickins@tiscali.co.uk>
Cc: KAMEZAWA Hiroyuki <kamezawa.hiroyu@jp.fujitsu.com>
Cc: Rik van Riel <riel@redhat.com>
Signed-off-by: Jiri Slaby <jirislaby@gmail.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Hugh Dickins
2009-12-14 17:58:42 -08:00
committed by Linus Torvalds
parent efa90a981b
commit 9625a5f289
2 changed files with 37 additions and 35 deletions
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include/linux/swap.h
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@ -165,7 +165,7 @@ struct swap_info_struct {
signed char next; /* next type on the swap list */
struct file *swap_file;
struct block_device *bdev;
struct list_head extent_list;
struct swap_extent first_swap_extent;
struct swap_extent *curr_swap_extent;
unsigned short *swap_map;
unsigned int lowest_bit;