btrfs: add incompat for raid1 with 3, 4 copies

The new raid1c3 and raid1c4 profiles are backward incompatible and the
name shall be 'raid1c34', the status can be found in the global
supported features in /sys/fs/btrfs/features or in the per-filesystem
directory.

Signed-off-by: David Sterba <dsterba@suse.com>

diff --git a/fs/btrfs/ctree.h b/fs/btrfs/ctree.h
index 923a8804ae943d4182063e1525858b9c0fb6e74f..e76b3cda13e30a1d2fb874e91ab1748c6061df5b 100644 (file)
--- a/fs/btrfs/ctree.h
+++ b/fs/btrfs/ctree.h
@@ -292,7 +292,8 @@ struct btrfs_super_block {
         BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF |         \
         BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA |       \
         BTRFS_FEATURE_INCOMPAT_NO_HOLES        |       \
-        BTRFS_FEATURE_INCOMPAT_METADATA_UUID)
+        BTRFS_FEATURE_INCOMPAT_METADATA_UUID   |       \
+        BTRFS_FEATURE_INCOMPAT_RAID1C34)
 
 #define BTRFS_FEATURE_INCOMPAT_SAFE_SET                        \
        (BTRFS_FEATURE_INCOMPAT_EXTENDED_IREF)

diff --git a/fs/btrfs/sysfs.c b/fs/btrfs/sysfs.c
index 786f4e4c654280b4a283acac909dc4f3c150df2c..a1da1f4a511da8d5973f95fa197373e5edeacb72 100644 (file)
--- a/fs/btrfs/sysfs.c
+++ b/fs/btrfs/sysfs.c
@@ -259,6 +259,7 @@ BTRFS_FEAT_ATTR_INCOMPAT(skinny_metadata, SKINNY_METADATA);
 BTRFS_FEAT_ATTR_INCOMPAT(no_holes, NO_HOLES);
 BTRFS_FEAT_ATTR_INCOMPAT(metadata_uuid, METADATA_UUID);
 BTRFS_FEAT_ATTR_COMPAT_RO(free_space_tree, FREE_SPACE_TREE);
+BTRFS_FEAT_ATTR_INCOMPAT(raid1c34, RAID1C34);
 
 static struct attribute *btrfs_supported_feature_attrs[] = {
        BTRFS_FEAT_ATTR_PTR(mixed_backref),
@@ -273,6 +274,7 @@ static struct attribute *btrfs_supported_feature_attrs[] = {
        BTRFS_FEAT_ATTR_PTR(no_holes),
        BTRFS_FEAT_ATTR_PTR(metadata_uuid),
        BTRFS_FEAT_ATTR_PTR(free_space_tree),
+       BTRFS_FEAT_ATTR_PTR(raid1c34),
        NULL
 };
 

diff --git a/fs/btrfs/volumes.c b/fs/btrfs/volumes.c
index 9054203ae671f78f7026ddd643023b6f872259ef..289c34f919960ebfdfe24aefd8f698e49f4c7024 100644 (file)
--- a/fs/btrfs/volumes.c
+++ b/fs/btrfs/volumes.c
@@ -4717,6 +4717,14 @@ static void check_raid56_incompat_flag(struct btrfs_fs_info *info, u64 type)
        btrfs_set_fs_incompat(info, RAID56);
 }
 
+static void check_raid1c34_incompat_flag(struct btrfs_fs_info *info, u64 type)
+{
+       if (!(type & (BTRFS_BLOCK_GROUP_RAID1C3 | BTRFS_BLOCK_GROUP_RAID1C4)))
+               return;
+
+       btrfs_set_fs_incompat(info, RAID1C34);
+}
+
 static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
                               u64 start, u64 type)
 {
@@ -4983,6 +4991,7 @@ static int __btrfs_alloc_chunk(struct btrfs_trans_handle *trans,
 
        free_extent_map(em);
        check_raid56_incompat_flag(info, type);
+       check_raid1c34_incompat_flag(info, type);
 
        kfree(devices_info);
        return 0;

diff --git a/include/uapi/linux/btrfs.h b/include/uapi/linux/btrfs.h
index a2b761275bbaa8e7737c104b54d5e1ff8902659a..7a8bc8b920f52e767bc78c55630fc5001acd7add 100644 (file)
--- a/include/uapi/linux/btrfs.h
+++ b/include/uapi/linux/btrfs.h
@@ -270,6 +270,7 @@ struct btrfs_ioctl_fs_info_args {
 #define BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA (1ULL << 8)
 #define BTRFS_FEATURE_INCOMPAT_NO_HOLES                (1ULL << 9)
 #define BTRFS_FEATURE_INCOMPAT_METADATA_UUID   (1ULL << 10)
+#define BTRFS_FEATURE_INCOMPAT_RAID1C34                (1ULL << 11)
 
 struct btrfs_ioctl_feature_flags {
        __u64 compat_flags;