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diff -up btrfs-progs-0.20.rc1.20121017git91d9eec/btrfsck.c.patch2 btrfs-progs-0.20.rc1.20121017git91d9eec/btrfsck.c
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--- btrfs-progs-0.20.rc1.20121017git91d9eec/btrfsck.c.patch2	2012-10-04 20:35:31.000000000 -0400
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+++ btrfs-progs-0.20.rc1.20121017git91d9eec/btrfsck.c	2012-10-17 13:45:30.172638798 -0400
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@@ -22,7 +22,9 @@
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 #include <stdlib.h>
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 #include <unistd.h>
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 #include <fcntl.h>
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+#include <sys/types.h>
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 #include <sys/stat.h>
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+#include <unistd.h>
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 #include <getopt.h>
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 #include "kerncompat.h"
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 #include "ctree.h"
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diff -up btrfs-progs-0.20.rc1.20121017git91d9eec/mkfs.c.patch2 btrfs-progs-0.20.rc1.20121017git91d9eec/mkfs.c
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--- btrfs-progs-0.20.rc1.20121017git91d9eec/mkfs.c.patch2	2012-10-17 13:45:30.167638835 -0400
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+++ btrfs-progs-0.20.rc1.20121017git91d9eec/mkfs.c	2012-10-17 13:46:41.444084426 -0400
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@@ -1228,7 +1228,7 @@ int main(int ac, char **av)
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 	u64 alloc_start = 0;
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 	u64 metadata_profile = 0;
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 	u64 data_profile = 0;
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-	u32 leafsize = getpagesize();
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+	u32 leafsize = sysconf(_SC_PAGESIZE);
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 	u32 sectorsize = 4096;
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 	u32 nodesize = leafsize;
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 	u32 stripesize = 4096;
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@@ -1304,7 +1304,7 @@ int main(int ac, char **av)
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 				print_usage();
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 		}
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 	}
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-	sectorsize = max(sectorsize, (u32)getpagesize());
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+	sectorsize = max(sectorsize, (u32)sysconf(_SC_PAGESIZE));
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 	if (check_leaf_or_node_size(leafsize, sectorsize))
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 		exit(1);
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 	if (check_leaf_or_node_size(nodesize, sectorsize))