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author | Nikolay Borisov <nborisov@suse.com> | 2017-06-16 14:39:19 +0300 |
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committer | David Sterba <dsterba@suse.com> | 2017-06-20 14:22:48 +0200 |
commit | eca152edf57e04f61d5a79e404d8e6c147278fdf (patch) | |
tree | c6b3876b1a15f950a6154d3878f00ed1a73224d6 /fs | |
parent | 0d0c71b317207082856f40dbe8a2bac813f49677 (diff) | |
download | op-kernel-dev-eca152edf57e04f61d5a79e404d8e6c147278fdf.zip op-kernel-dev-eca152edf57e04f61d5a79e404d8e6c147278fdf.tar.gz |
btrfs: Manually implement device_total_bytes getter/setter
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@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Diffstat (limited to 'fs')
-rw-r--r-- | fs/btrfs/ctree.h | 20 |
1 files changed, 19 insertions, 1 deletions
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h index d868509..b31515a 100644 --- a/fs/btrfs/ctree.h +++ b/fs/btrfs/ctree.h @@ -1541,8 +1541,26 @@ 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); |