The device->total_bytes member needs to always be rounded down to sectorsize
so that it corresponds to the value of super->total_bytes. However, there are
multiple places where the setter is fed a value which is not rounded which
can cause a fs to be unmountable due to the check introduced in
99e3ecfcb9f4 ("Btrfs: add more validation checks for superblock"). This patch
implements the getter/setter manually so that in a later patch I can add
necessary code to catch offenders.
Signed-off-by: Nikolay Borisov <nborisov@xxxxxxxx>
---
fs/btrfs/ctree.h | 20 +++++++++++++++++++-
1 file changed, 19 insertions(+), 1 deletion(-)
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 0334452a7be1..ce4929ad5914 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -1552,8 +1552,26 @@ static inline void btrfs_set_##name(type *s, u##bits val) \
s->member = cpu_to_le##bits(val); \
}
+
+static inline u64 btrfs_device_total_bytes(struct extent_buffer *eb,
+ struct btrfs_dev_item *s)
+{
+ BUILD_BUG_ON(sizeof(u64) !=
+ sizeof(((struct btrfs_dev_item *)0))->total_bytes);
+ return btrfs_get_64(eb, s, offsetof(struct btrfs_dev_item,
+ total_bytes));
+}
+static inline void btrfs_set_device_total_bytes(struct extent_buffer *eb,
+ struct btrfs_dev_item *s,
+ u64 val)
+{
+ BUILD_BUG_ON(sizeof(u64) !=
+ sizeof(((struct btrfs_dev_item *)0))->total_bytes);
+ btrfs_set_64(eb, s, offsetof(struct btrfs_dev_item, total_bytes), val);
+}
+
+
BTRFS_SETGET_FUNCS(device_type, struct btrfs_dev_item, type, 64);
-BTRFS_SETGET_FUNCS(device_total_bytes, struct btrfs_dev_item, total_bytes, 64);
BTRFS_SETGET_FUNCS(device_bytes_used, struct btrfs_dev_item, bytes_used, 64);
BTRFS_SETGET_FUNCS(device_io_align, struct btrfs_dev_item, io_align, 32);
BTRFS_SETGET_FUNCS(device_io_width, struct btrfs_dev_item, io_width, 32);
--
2.7.4
--
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