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authorStefan Behrens <sbehrens@giantdisaster.de>2013-08-15 17:11:22 +0200
committerChris Mason <chris.mason@fusionio.com>2013-09-01 08:15:57 -0400
commit26432799c902b76e87f68f5c88f2146a78ba84af (patch)
tree42f9421a2bb76eada9778ef81d50e3f52656378b /fs/btrfs/ctree.h
parent803b2f54fb4faf6d76fca43e59bcc555d9713cd4 (diff)
Btrfs: introduce uuid-tree-gen field
In order to be able to detect the case that a filesystem is mounted with an old kernel, add a uuid-tree-gen field like the free space cache is doing it. It is part of the super block and written with each commit. Old kernels do not know this field and don't update it. Signed-off-by: Stefan Behrens <sbehrens@giantdisaster.de> Signed-off-by: Josef Bacik <jbacik@fusionio.com> Signed-off-by: Chris Mason <chris.mason@fusionio.com>
Diffstat (limited to 'fs/btrfs/ctree.h')
-rw-r--r--fs/btrfs/ctree.h5
1 files changed, 4 insertions, 1 deletions
diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index df2b9c22b4c..02b1cefbc30 100644
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -482,9 +482,10 @@ struct btrfs_super_block {
char label[BTRFS_LABEL_SIZE];
__le64 cache_generation;
+ __le64 uuid_tree_generation;
/* future expansion */
- __le64 reserved[31];
+ __le64 reserved[30];
u8 sys_chunk_array[BTRFS_SYSTEM_CHUNK_ARRAY_SIZE];
struct btrfs_root_backup super_roots[BTRFS_NUM_BACKUP_ROOTS];
} __attribute__ ((__packed__));
@@ -2900,6 +2901,8 @@ BTRFS_SETGET_STACK_FUNCS(super_csum_type, struct btrfs_super_block,
BTRFS_SETGET_STACK_FUNCS(super_cache_generation, struct btrfs_super_block,
cache_generation, 64);
BTRFS_SETGET_STACK_FUNCS(super_magic, struct btrfs_super_block, magic, 64);
+BTRFS_SETGET_STACK_FUNCS(super_uuid_tree_generation, struct btrfs_super_block,
+ uuid_tree_generation, 64);
static inline int btrfs_super_csum_size(struct btrfs_super_block *s)
{