[PATCH U-BOOT v2 2/3] fs: btrfs: Reject fs with sector size other than PAGE_SIZE

Qu Wenruo wqu at suse.com
Thu Mar 26 06:35:55 CET 2020

Although in theory u-boot fs driver could easily support more sector
sizes, current code base doesn't have good enough way to grab sector
size yet.

This would cause problem for later LZO fixes which rely on sector size.

And considering that most u-boot boards are using 4K page size, which is
also the most common sector size for btrfs, rejecting fs with
non-page-sized sector size shouldn't cause much problem.

This should only be a quick fix before we implement better sector size

Signed-off-by: Qu Wenruo <wqu at suse.com>
Cc: Marek Behun <marek.behun at nic.cz>
 fs/btrfs/super.c | 8 ++++++++
 1 file changed, 8 insertions(+)

diff --git a/fs/btrfs/super.c b/fs/btrfs/super.c
index 2dc4a6fcd7a3..b693a073fc0b 100644
--- a/fs/btrfs/super.c
+++ b/fs/btrfs/super.c
@@ -7,6 +7,7 @@
 #include "btrfs.h"
 #include <memalign.h>
+#include <linux/compat.h>
@@ -232,6 +233,13 @@ int btrfs_read_superblock(void)
 		return -1;
+	if (sb->sectorsize != PAGE_SIZE) {
+		printf(
+	"%s: Unsupported sector size (%u), only supports %u as sector size\n",
+			__func__, sb->sectorsize, PAGE_SIZE);
+		return -1;
+	}
 	if (btrfs_info.sb.num_devices != 1) {
 		printf("%s: Unsupported number of devices (%lli). This driver "
 		       "only supports filesystem on one device.\n", __func__,

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