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Subject[Suspend2][ 04/35] [Suspend2] Does a filewriter page have contiguous blocks?
Date
To simplify things, pages in the file being used by the filewriter which
don't have contiguous blocks are ignored. This function determines whether
a given page meets this criteria by bmapping each sector in the page to
check.

Signed-off-by: Nigel Cunningham <nigel@suspend2.net>

kernel/power/suspend_file.c | 18 ++++++++++++++++++
1 files changed, 18 insertions(+), 0 deletions(-)
diff --git a/kernel/power/suspend_file.c b/kernel/power/suspend_file.c
index caa86bc..41aaed4 100644
--- a/kernel/power/suspend_file.c
+++ b/kernel/power/suspend_file.c
@@ -136,3 +136,21 @@ static int filewriter_storage_available(
return result;
}

+static int has_contiguous_blocks(int page_num)
+{
+ int j;
+ sector_t last = 0;
+
+ for (j = 0; j < devinfo.blocks_per_page; j++) {
+ sector_t this = bmap(target_inode,
+ page_num * devinfo.blocks_per_page + j);
+
+ if (!this || (last && (last + 1) != this))
+ break;
+
+ last = this;
+ }
+
+ return (j == devinfo.blocks_per_page);
+}
+
--
Nigel Cunningham nigel at suspend2 dot net
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