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Btrfs: Add support for mirroring across drives

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Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason
2008-04-03 16:29:03 -04:00
parent 0ef8b2428a
commit 8790d502e4
6 changed files with 198 additions and 93 deletions
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95
fs/btrfs/extent-tree.c
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@@ -230,9 +230,13 @@ again:
goto new_group;
if (start + num > total_fs_bytes)
goto new_group;
if (!block_group_bits(cache, data)) {
printk("block group bits don't match %Lu %Lu\n", cache->flags, data);
}
*start_ret = start;
return 0;
} out:
}
out:
cache = btrfs_lookup_block_group(root->fs_info, search_start);
if (!cache) {
printk("Unable to find block group for %Lu\n", search_start);
@@ -365,14 +369,17 @@ again:
if (cache->key.objectid > total_fs_bytes)
break;
if (full_search)
free_check = cache->key.offset;
else
free_check = div_factor(cache->key.offset, factor);
if (block_group_bits(cache, data)) {
if (full_search)
free_check = cache->key.offset;
else
free_check = div_factor(cache->key.offset,
factor);
if (used + cache->pinned < free_check) {
found_group = cache;
goto found;
if (used + cache->pinned < free_check) {
found_group = cache;
goto found;
}
}
cond_resched();
}
@@ -1038,6 +1045,19 @@ static int update_space_info(struct btrfs_fs_info *info, u64 flags,
return 0;
}
static void set_avail_alloc_bits(struct btrfs_fs_info *fs_info, u64 flags)
{
u64 extra_flags = flags & (BTRFS_BLOCK_GROUP_RAID0 |
BTRFS_BLOCK_GROUP_RAID1);
if (extra_flags) {
if (flags & BTRFS_BLOCK_GROUP_DATA)
fs_info->avail_data_alloc_bits |= extra_flags;
if (flags & BTRFS_BLOCK_GROUP_METADATA)
fs_info->avail_metadata_alloc_bits |= extra_flags;
if (flags & BTRFS_BLOCK_GROUP_SYSTEM)
fs_info->avail_system_alloc_bits |= extra_flags;
}
}
static int do_chunk_alloc(struct btrfs_trans_handle *trans,
struct btrfs_root *extent_root, u64 alloc_bytes,
@@ -1060,7 +1080,7 @@ static int do_chunk_alloc(struct btrfs_trans_handle *trans,
if (space_info->full)
return 0;
thresh = div_factor(space_info->total_bytes, 7);
thresh = div_factor(space_info->total_bytes, 6);
if ((space_info->bytes_used + space_info->bytes_pinned + alloc_bytes) <
thresh)
return 0;
@@ -1079,16 +1099,7 @@ printk("space info full %Lu\n", flags);
start, num_bytes);
BUG_ON(ret);
if (flags & BTRFS_BLOCK_GROUP_RAID0) {
if (flags & BTRFS_BLOCK_GROUP_DATA) {
extent_root->fs_info->extra_data_alloc_bits =
BTRFS_BLOCK_GROUP_RAID0;
}
if (flags & BTRFS_BLOCK_GROUP_METADATA) {
extent_root->fs_info->extra_alloc_bits =
BTRFS_BLOCK_GROUP_RAID0;
}
}
set_avail_alloc_bits(extent_root->fs_info, flags);
return 0;
}
@@ -1529,6 +1540,7 @@ static int noinline find_free_extent(struct btrfs_trans_handle *trans,
if (data & BTRFS_BLOCK_GROUP_METADATA) {
last_ptr = &root->fs_info->last_alloc;
empty_cluster = 256 * 1024;
}
if ((data & BTRFS_BLOCK_GROUP_DATA) && btrfs_test_opt(root, SSD)) {
@@ -1693,6 +1705,7 @@ int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
u64 root_used;
u64 search_start = 0;
u64 new_hint;
u64 alloc_profile;
u32 sizes[2];
struct btrfs_fs_info *info = root->fs_info;
struct btrfs_root *extent_root = info->extent_root;
@@ -1700,31 +1713,32 @@ int btrfs_alloc_extent(struct btrfs_trans_handle *trans,
struct btrfs_extent_ref *ref;
struct btrfs_path *path;
struct btrfs_key keys[2];
int extra_chunk_alloc_bits = 0;
if (data) {
data = BTRFS_BLOCK_GROUP_DATA | info->extra_data_alloc_bits;
alloc_profile = info->avail_data_alloc_bits &
info->data_alloc_profile;
data = BTRFS_BLOCK_GROUP_DATA | alloc_profile;
} else if (root == root->fs_info->chunk_root) {
data = BTRFS_BLOCK_GROUP_SYSTEM;
alloc_profile = info->avail_system_alloc_bits &
info->system_alloc_profile;
data = BTRFS_BLOCK_GROUP_SYSTEM | alloc_profile;
} else {
data = BTRFS_BLOCK_GROUP_METADATA | info->extra_alloc_bits;
alloc_profile = info->avail_metadata_alloc_bits &
info->metadata_alloc_profile;
data = BTRFS_BLOCK_GROUP_METADATA | alloc_profile;
}
if (btrfs_super_num_devices(&info->super_copy) > 1 &&
!(data & BTRFS_BLOCK_GROUP_SYSTEM))
extra_chunk_alloc_bits = BTRFS_BLOCK_GROUP_RAID0;
if (root->ref_cows) {
if (!(data & BTRFS_BLOCK_GROUP_METADATA)) {
ret = do_chunk_alloc(trans, root->fs_info->extent_root,
2 * 1024 * 1024,
BTRFS_BLOCK_GROUP_METADATA |
info->extra_alloc_bits |
extra_chunk_alloc_bits);
(info->metadata_alloc_profile &
info->avail_metadata_alloc_bits));
BUG_ON(ret);
}
ret = do_chunk_alloc(trans, root->fs_info->extent_root,
num_bytes + 2 * 1024 * 1024, data |
extra_chunk_alloc_bits);
num_bytes + 2 * 1024 * 1024, data);
BUG_ON(ret);
}
@@ -2046,12 +2060,12 @@ static int noinline walk_down_tree(struct btrfs_trans_handle *trans,
if (!next || !btrfs_buffer_uptodate(next)) {
free_extent_buffer(next);
reada_walk_down(root, cur, path->slots[*level]);
next = read_tree_block(root, bytenr, blocksize);
/* we used to drop the lock above, keep the
* code to double check so that we won't forget
* when we drop the lock again in the future
*/
mutex_unlock(&root->fs_info->fs_mutex);
next = read_tree_block(root, bytenr, blocksize);
mutex_lock(&root->fs_info->fs_mutex);
/* we've dropped the lock, double check */
ret = lookup_extent_ref(trans, root, bytenr,
blocksize, &refs);
BUG_ON(ret);
@@ -2739,16 +2753,7 @@ int btrfs_read_block_groups(struct btrfs_root *root)
} else if (cache->flags & BTRFS_BLOCK_GROUP_METADATA) {
bit = BLOCK_GROUP_METADATA;
}
if (cache->flags & BTRFS_BLOCK_GROUP_RAID0) {
if (cache->flags & BTRFS_BLOCK_GROUP_DATA) {
info->extra_data_alloc_bits =
BTRFS_BLOCK_GROUP_RAID0;
}
if (cache->flags & BTRFS_BLOCK_GROUP_METADATA) {
info->extra_alloc_bits =
BTRFS_BLOCK_GROUP_RAID0;
}
}
set_avail_alloc_bits(info, cache->flags);
ret = update_space_info(info, cache->flags, found_key.offset,
btrfs_block_group_used(&cache->item),