Before this change, passing -O skinny-metadata to mkfs.btrfs would
only set the skinny metadata incompat flag in the super block after
the filesystem was created. This change makes mkfs.btrfs directly
create a filesystem with only skinny extents for metadata.
Signed-off-by: Filipe David Borba Manana <fdman...@gmail.com>
---
NOTE: this patch is based on top of David Sterba's integration
branch integration-20130810.
V2: reuse existing item_size variable in for loop instead
of shadowing existing one.
btrfs-convert.c | 2 +-
mkfs.c | 37 +++++++++++++++----------------------
utils.c | 26 +++++++++++++++++++-------
utils.h | 2 +-
4 files changed, 36 insertions(+), 31 deletions(-)
diff --git a/btrfs-convert.c b/btrfs-convert.c
index a4608ec..e7eddd1 100644
--- a/btrfs-convert.c
+++ b/btrfs-convert.c
@@ -2322,7 +2322,7 @@ static int do_convert(const char *devname, int datacsum,
int packing,
}
ret = make_btrfs(fd, devname, ext2_fs->super->s_volume_name,
blocks, total_bytes, blocksize, blocksize,
- blocksize, blocksize);
+ blocksize, blocksize, 0);
if (ret) {
fprintf(stderr, "unable to create initial ctree: %s\n",
strerror(-ret));
diff --git a/mkfs.c b/mkfs.c
index 8183879..294aed6 100644
--- a/mkfs.c
+++ b/mkfs.c
@@ -1301,8 +1301,6 @@ int main(int ac, char **av)
u64 num_of_meta_chunks = 0;
u64 size_of_data = 0;
u64 source_dir_size = 0;
- struct btrfs_super_block *super;
- u64 flags;
int dev_cnt = 0;
int saved_optind;
char estr[100];
@@ -1508,9 +1506,23 @@ int main(int ac, char **av)
leafsize * i;
}
+ /*
+ * FS features that can be set by other means than -O
+ * just set the bit here
+ */
+ if (mixed)
+ features |= BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS;
+
+ if ((data_profile | metadata_profile) &
+ (BTRFS_BLOCK_GROUP_RAID5 | BTRFS_BLOCK_GROUP_RAID6)) {
+ features |= BTRFS_FEATURE_INCOMPAT_RAID56;
+ }
+
+ process_fs_features(features);
+
ret = make_btrfs(fd, file, label, blocks, dev_block_count,
nodesize, leafsize,
- sectorsize, stripesize);
+ sectorsize, stripesize, features);
if (ret) {
fprintf(stderr, "error during mkfs: %s\n", strerror(-ret));
exit(1);
@@ -1585,25 +1597,6 @@ raid_groups:
ret = create_data_reloc_tree(trans, root);
BUG_ON(ret);
- super = root->fs_info->super_copy;
- flags = btrfs_super_incompat_flags(super);
-
- /*
- * FS features that can be set by other means than -O
- * just set the bit here
- */
- if (mixed)
- features |= BTRFS_FEATURE_INCOMPAT_MIXED_GROUPS;
-
- if ((data_profile | metadata_profile) &
- (BTRFS_BLOCK_GROUP_RAID5 | BTRFS_BLOCK_GROUP_RAID6)) {
- features |= BTRFS_FEATURE_INCOMPAT_RAID56;
- }
-
- process_fs_features(features);
- flags |= features;
- btrfs_set_super_incompat_flags(super, flags);
-
printf("fs created label %s on %s\n\tnodesize %u leafsize %u "
"sectorsize %u size %s\n",
label, first_file, nodesize, leafsize, sectorsize,
diff --git a/utils.c b/utils.c
index 86ee948..979b6b9 100644
--- a/utils.c
+++ b/utils.c
@@ -80,7 +80,7 @@ static u64 reference_root_table[] = {
int make_btrfs(int fd, const char *device, const char *label,
u64 blocks[7], u64 num_bytes, u32 nodesize,
- u32 leafsize, u32 sectorsize, u32 stripesize)
+ u32 leafsize, u32 sectorsize, u32 stripesize, u64 features)
{
struct btrfs_super_block super;
struct extent_buffer *buf;
@@ -101,6 +101,8 @@ int make_btrfs(int fd, const char *device, const char
*label,
u64 ref_root;
u32 array_size;
u32 item_size;
+ int skinny_metadata = !!(features &
+ BTRFS_FEATURE_INCOMPAT_SKINNY_METADATA);
first_free = BTRFS_SUPER_INFO_OFFSET + sectorsize * 2 - 1;
first_free &= ~((u64)sectorsize - 1);
@@ -127,6 +129,7 @@ int make_btrfs(int fd, const char *device, const char
*label,
btrfs_set_super_csum_type(&super, BTRFS_CSUM_TYPE_CRC32);
btrfs_set_super_chunk_root_generation(&super, 1);
btrfs_set_super_cache_generation(&super, -1);
+ btrfs_set_super_incompat_flags(&super, features);
if (label)
strncpy(super.label, label, BTRFS_LABEL_SIZE - 1);
@@ -225,21 +228,30 @@ int make_btrfs(int fd, const char *device, const char
*label,
nritems = 0;
itemoff = __BTRFS_LEAF_DATA_SIZE(leafsize);
for (i = 1; i < 7; i++) {
+ item_size = sizeof(struct btrfs_extent_item);
+ if (!skinny_metadata)
+ item_size += sizeof(struct btrfs_tree_block_info);
+
BUG_ON(blocks[i] < first_free);
BUG_ON(blocks[i] < blocks[i - 1]);
/* create extent item */
- itemoff -= sizeof(struct btrfs_extent_item) +
- sizeof(struct btrfs_tree_block_info);
+ itemoff -= item_size;
btrfs_set_disk_key_objectid(&disk_key, blocks[i]);
- btrfs_set_disk_key_offset(&disk_key, leafsize);
- btrfs_set_disk_key_type(&disk_key, BTRFS_EXTENT_ITEM_KEY);
+ if (skinny_metadata) {
+ btrfs_set_disk_key_type(&disk_key,
+ BTRFS_METADATA_ITEM_KEY);
+ btrfs_set_disk_key_offset(&disk_key, 0);
+ } else {
+ btrfs_set_disk_key_type(&disk_key,
+ BTRFS_EXTENT_ITEM_KEY);
+ btrfs_set_disk_key_offset(&disk_key, leafsize);
+ }
btrfs_set_item_key(buf, &disk_key, nritems);
btrfs_set_item_offset(buf, btrfs_item_nr(buf, nritems),
itemoff);
btrfs_set_item_size(buf, btrfs_item_nr(buf, nritems),
- sizeof(struct btrfs_extent_item) +
- sizeof(struct btrfs_tree_block_info));
+ item_size);
extent_item = btrfs_item_ptr(buf, nritems,
struct btrfs_extent_item);
btrfs_set_extent_refs(buf, extent_item, 1);
diff --git a/utils.h b/utils.h
index ec06a82..5dc1d98 100644
--- a/utils.h
+++ b/utils.h
@@ -30,7 +30,7 @@
int make_btrfs(int fd, const char *device, const char *label,
u64 blocks[6], u64 num_bytes, u32 nodesize,
- u32 leafsize, u32 sectorsize, u32 stripesize);
+ u32 leafsize, u32 sectorsize, u32 stripesize, u64 features);
int btrfs_make_root_dir(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u64 objectid);
int btrfs_prepare_device(int fd, char *file, int zero_end, u64
*block_count_ret,
--
1.7.9.5
--
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