From 0f3966579815f889bb2fcb4846152c35f65e79c4 Mon Sep 17 00:00:00 2001 From: Daniel Golle Date: Thu, 15 May 2014 21:06:33 +0200 Subject: [PATCH 2/5] ubi: auto-create ubiblock device for rootfs To: openwrt-devel@lists.openwrt.org Signed-off-by: Daniel Golle --- drivers/mtd/ubi/block.c | 42 ++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 42 insertions(+) --- a/drivers/mtd/ubi/block.c +++ b/drivers/mtd/ubi/block.c @@ -615,6 +615,44 @@ static int __init ubiblock_create_from_p return ret; } +#define UBIFS_NODE_MAGIC 0x06101831 +static inline int ubi_vol_is_ubifs(struct ubi_volume_desc *desc) +{ + int ret; + uint32_t magic_of, magic; + ret = ubi_read(desc, 0, (char *)&magic_of, 0, 4); + if (ret) + return 0; + magic = le32_to_cpu(magic_of); + return magic == UBIFS_NODE_MAGIC; +} + +static void __init ubiblock_create_auto_rootfs(void) +{ + int ubi_num, ret, is_ubifs; + struct ubi_volume_desc *desc; + struct ubi_volume_info vi; + + for (ubi_num = 0; ubi_num < UBI_MAX_DEVICES; ubi_num++) { + desc = ubi_open_volume_nm(ubi_num, "rootfs", UBI_READONLY); + if (IS_ERR(desc)) + continue; + + ubi_get_volume_info(desc, &vi); + is_ubifs = ubi_vol_is_ubifs(desc); + ubi_close_volume(desc); + if (is_ubifs) + break; + + ret = ubiblock_create(&vi); + if (ret) + ubi_err("block: can't add '%s' volume, err=%d\n", + vi.name, ret); + /* always break if we get here */ + break; + } +} + static void ubiblock_remove_all(void) { struct ubiblock *next; @@ -645,6 +683,10 @@ int __init ubiblock_init(void) if (ret) goto err_remove; + /* auto-attach "rootfs" volume if existing and non-ubifs */ + if (config_enabled(CONFIG_MTD_ROOTFS_ROOT_DEV)) + ubiblock_create_auto_rootfs(); + /* * Block devices are only created upon user requests, so we ignore * existing volumes. bef5766fa18f52e7a7d1928b25edc63e73937'>refslogtreecommitdiffstats
path: root/target/linux/generic/patches-3.18/532-jffs2_eofdetect.patch
blob: 269179063cd4373a8b004a50b2c3115b684c53fc (plain) 
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--- a/fs/jffs2/build.c
+++ b/fs/jffs2/build.c
@@ -114,6 +114,16 @@ static int jffs2_build_filesystem(struct
 	dbg_fsbuild("scanned flash completely\n");
 	jffs2_dbg_dump_block_lists_nolock(c);
 
+	if (c->flags & (1 << 7)) {
+		printk("%s(): unlocking the mtd device... ", __func__);
+		mtd_unlock(c->mtd, 0, c->mtd->size);
+		printk("done.\n");
+
+		printk("%s(): erasing all blocks after the end marker... ", __func__);
+		jffs2_erase_pending_blocks(c, -1);
+		printk("done.\n");
+	}
+
 	dbg_fsbuild("pass 1 starting\n");
 	c->flags |= JFFS2_SB_FLAG_BUILDING;
 	/* Now scan the directory tree, increasing nlink according to every dirent found. */
--- a/fs/jffs2/scan.c
+++ b/fs/jffs2/scan.c
@@ -148,8 +148,14 @@ int jffs2_scan_medium(struct jffs2_sb_in
 		/* reset summary info for next eraseblock scan */
 		jffs2_sum_reset_collected(s);
 
-		ret = jffs2_scan_eraseblock(c, jeb, buf_size?flashbuf:(flashbuf+jeb->offset),
-						buf_size, s);
+		if (c->flags & (1 << 7)) {
+			if (mtd_block_isbad(c->mtd, jeb->offset))
+				ret = BLK_STATE_BADBLOCK;
+			else
+				ret = BLK_STATE_ALLFF;
+		} else
+			ret = jffs2_scan_eraseblock(c, jeb, buf_size?flashbuf:(flashbuf+jeb->offset),
+							buf_size, s);
 
 		if (ret < 0)
 			goto out;
@@ -556,6 +562,17 @@ static int jffs2_scan_eraseblock (struct
 			return err;
 	}
 
+	if ((buf[0] == 0xde) &&
+		(buf[1] == 0xad) &&
+		(buf[2] == 0xc0) &&
+		(buf[3] == 0xde)) {
+		/* end of filesystem. erase everything after this point */
+		printk("%s(): End of filesystem marker found at 0x%x\n", __func__, jeb->offset);
+		c->flags |= (1 << 7);
+
+		return BLK_STATE_ALLFF;
+	}
+
 	/* We temporarily use 'ofs' as a pointer into the buffer/jeb */
 	ofs = 0;
 	max_ofs = EMPTY_SCAN_SIZE(c->sector_size);