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authorRafael J. Wysocki <rjw@sisk.pl>2006-12-07 07:34:10 +0300
committerLinus Torvalds <torvalds@woody.osdl.org>2006-12-07 19:39:27 +0300
commit3aef83e0ef1ffb8ea3bea97be46821a45c952173 (patch)
treef73878eb2ecce804c9eea6fbb13603907b3674b4 /mm/swapfile.c
parent3fc6b34f4803b959c1e30c15247e2180cd529115 (diff)
downloadlinux-3aef83e0ef1ffb8ea3bea97be46821a45c952173.tar.xz
[PATCH] swsusp: use block device offsets to identify swap locations
Make swsusp use block device offsets instead of swap offsets to identify swap locations and make it use the same code paths for writing as well as for reading data. This allows us to use the same code for handling swap files and swap partitions and to simplify the code, eg. by dropping rw_swap_page_sync(). Signed-off-by: Rafael J. Wysocki <rjw@sisk.pl> Cc: Pavel Machek <pavel@ucw.cz> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
Diffstat (limited to 'mm/swapfile.c')
-rw-r--r--mm/swapfile.c17
1 files changed, 17 insertions, 0 deletions
diff --git a/mm/swapfile.c b/mm/swapfile.c
index 2bfacbac0f4c..55242363de64 100644
--- a/mm/swapfile.c
+++ b/mm/swapfile.c
@@ -945,6 +945,23 @@ sector_t map_swap_page(struct swap_info_struct *sis, pgoff_t offset)
}
}
+#ifdef CONFIG_SOFTWARE_SUSPEND
+/*
+ * Get the (PAGE_SIZE) block corresponding to given offset on the swapdev
+ * corresponding to given index in swap_info (swap type).
+ */
+sector_t swapdev_block(int swap_type, pgoff_t offset)
+{
+ struct swap_info_struct *sis;
+
+ if (swap_type >= nr_swapfiles)
+ return 0;
+
+ sis = swap_info + swap_type;
+ return (sis->flags & SWP_WRITEOK) ? map_swap_page(sis, offset) : 0;
+}
+#endif /* CONFIG_SOFTWARE_SUSPEND */
+
/*
* Free all of a swapdev's extent information
*/