kernel/3.10: add EOF marker support to the UBI layer

Signed-off-by: Gabor Juhos <juhosg@openwrt.org> git-svn-id: svn://svn.openwrt.org/openwrt/trunk@38681 3c298f89-4303-0410-b956-a3cf2f4a3e73
2013-11-07 19:53:00 +00:00 · 2013-11-07 19:53:00 +00:00 · 65e8ac294b
parent f65f2f0e02
commit 65e8ac294b
1 changed files with 51 additions and 0 deletions
--- a/target/linux/generic/patches-3.10/490-mtd-ubi-add-EOF-marker-support.patch
+++ b/target/linux/generic/patches-3.10/490-mtd-ubi-add-EOF-marker-support.patch
@ -0,0 +1,51 @@
+--- a/drivers/mtd/ubi/attach.c
+++ b/drivers/mtd/ubi/attach.c
+@@ -800,6 +800,13 @@ out_unlock:
+ 	return err;
+ }
+ 
+static bool ec_hdr_has_eof(struct ubi_ec_hdr *ech)
+{
+	return ech->padding1[0] == 'E' &&
+	       ech->padding1[1] == 'O' &&
+	       ech->padding1[2] == 'F';
+}
+
+ /**
+  * scan_peb - scan and process UBI headers of a PEB.
+  * @ubi: UBI device description object
+@@ -830,9 +837,21 @@ static int scan_peb(struct ubi_device *u
+ 		return 0;
+ 	}
+ 
+-	err = ubi_io_read_ec_hdr(ubi, pnum, ech, 0);
+-	if (err < 0)
+-		return err;
+	if (!ai->eof_found) {
+		err = ubi_io_read_ec_hdr(ubi, pnum, ech, 0);
+		if (err < 0)
+			return err;
+
+		if (ec_hdr_has_eof(ech)) {
+			ubi_msg("EOF marker found, PEBs from %d will be erased",
+				pnum);
+			ai->eof_found = true;
+		}
+	}
+
+	if (ai->eof_found)
+		err = UBI_IO_FF_BITFLIPS;
+
+ 	switch (err) {
+ 	case 0:
+ 		break;
+--- a/drivers/mtd/ubi/ubi.h
+++ b/drivers/mtd/ubi/ubi.h
+@@ -701,6 +701,7 @@ struct ubi_attach_info {
+ 	int mean_ec;
+ 	uint64_t ec_sum;
+ 	int ec_count;
+	bool eof_found;
+ 	struct kmem_cache *aeb_slab_cache;
+ };
+