Commit e8f03d02 authored by Andreas Dilger's avatar Andreas Dilger Committed by Linus Torvalds

[PATCH] reserve space for swap label

Reserve space in the swap disk header for a LABEL and UUID to be specified.
 This has been possible with util-linux-2.12b (via e2fsprogs 1.36
libblkid), and is used by at least FC3 and later.  The kernel doesn't
really care about this, but the space shouldn't accidentally be used by
something else either.

Also make the on-disk structures be fixed-size types, instead of "int",
though I don't know of any architecture in use where an "int" isn't the
same size as a "__u32" (all current kernel arches have it as "unsigned
int").
Signed-off-by: default avatarAndreas Dilger <adilger@shaw.ca>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent 6937a25c
...@@ -48,12 +48,14 @@ union swap_header { ...@@ -48,12 +48,14 @@ union swap_header {
char magic[10]; /* SWAP-SPACE or SWAPSPACE2 */ char magic[10]; /* SWAP-SPACE or SWAPSPACE2 */
} magic; } magic;
struct { struct {
char bootbits[1024]; /* Space for disklabel etc. */ char bootbits[1024]; /* Space for disklabel etc. */
unsigned int version; __u32 version;
unsigned int last_page; __u32 last_page;
unsigned int nr_badpages; __u32 nr_badpages;
unsigned int padding[125]; unsigned char sws_uuid[16];
unsigned int badpages[1]; unsigned char sws_volume[16];
__u32 padding[117];
__u32 badpages[1];
} info; } info;
}; };
......
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