Yan, Zheng
2010-Apr-26 10:44 UTC
[PATCH V2 01/12] Btrfs: Link block groups of different raid types in the same space_info
The size of reserved space is stored in space_info. If block groups
of different raid types are linked to separate space_info, changing
allocation profile will corrupt reserved space accounting.
Signed-off-by: Yan Zheng <zheng.yan@oracle.com>
---
diff -urp 2/fs/btrfs/ctree.h 3/fs/btrfs/ctree.h
--- 2/fs/btrfs/ctree.h 2010-04-26 17:23:52.921839641 +0800
+++ 3/fs/btrfs/ctree.h 2010-04-26 17:23:52.926830638 +0800
@@ -662,6 +662,7 @@ struct btrfs_csum_item {
#define BTRFS_BLOCK_GROUP_RAID1 (1 << 4)
#define BTRFS_BLOCK_GROUP_DUP (1 << 5)
#define BTRFS_BLOCK_GROUP_RAID10 (1 << 6)
+#define BTRFS_NR_RAID_TYPES 5
struct btrfs_block_group_item {
__le64 used;
@@ -673,7 +674,8 @@ struct btrfs_space_info {
u64 flags;
u64 total_bytes; /* total bytes in the space */
- u64 bytes_used; /* total bytes used on disk */
+ u64 bytes_used; /* total bytes used,
+ this does''t take mirrors into account */
u64 bytes_pinned; /* total bytes pinned, will be freed when the
transaction finishes */
u64 bytes_reserved; /* total bytes the allocator has reserved for
@@ -686,6 +688,7 @@ struct btrfs_space_info {
delalloc/allocations */
u64 bytes_delalloc; /* number of bytes currently reserved for
delayed allocation */
+ u64 disk_used; /* total bytes used on disk */
int full; /* indicates that we cannot allocate any more
chunks for this space */
@@ -703,7 +706,7 @@ struct btrfs_space_info {
int flushing;
/* for block groups in our same type */
- struct list_head block_groups;
+ struct list_head block_groups[BTRFS_NR_RAID_TYPES];
spinlock_t lock;
struct rw_semaphore groups_sem;
atomic_t caching_threads;
diff -urp 2/fs/btrfs/extent-tree.c 3/fs/btrfs/extent-tree.c
--- 2/fs/btrfs/extent-tree.c 2010-04-26 17:23:52.922840061 +0800
+++ 3/fs/btrfs/extent-tree.c 2010-04-26 17:23:52.929829246 +0800
@@ -506,6 +506,9 @@ static struct btrfs_space_info *__find_s
struct list_head *head = &info->space_info;
struct btrfs_space_info *found;
+ flags &= BTRFS_BLOCK_GROUP_DATA | BTRFS_BLOCK_GROUP_SYSTEM |
+ BTRFS_BLOCK_GROUP_METADATA;
+
rcu_read_lock();
list_for_each_entry_rcu(found, head, list) {
if (found->flags == flags) {
@@ -2659,12 +2662,21 @@ static int update_space_info(struct btrf
struct btrfs_space_info **space_info)
{
struct btrfs_space_info *found;
+ int i;
+ int factor;
+
+ if (flags & (BTRFS_BLOCK_GROUP_DUP | BTRFS_BLOCK_GROUP_RAID1 |
+ BTRFS_BLOCK_GROUP_RAID10))
+ factor = 2;
+ else
+ factor = 1;
found = __find_space_info(info, flags);
if (found) {
spin_lock(&found->lock);
found->total_bytes += total_bytes;
found->bytes_used += bytes_used;
+ found->disk_used += bytes_used * factor;
found->full = 0;
spin_unlock(&found->lock);
*space_info = found;
@@ -2674,14 +2686,18 @@ static int update_space_info(struct btrf
if (!found)
return -ENOMEM;
- INIT_LIST_HEAD(&found->block_groups);
+ for (i = 0; i < BTRFS_NR_RAID_TYPES; i++)
+ INIT_LIST_HEAD(&found->block_groups[i]);
init_rwsem(&found->groups_sem);
init_waitqueue_head(&found->flush_wait);
init_waitqueue_head(&found->allocate_wait);
spin_lock_init(&found->lock);
- found->flags = flags;
+ found->flags = flags & (BTRFS_BLOCK_GROUP_DATA |
+ BTRFS_BLOCK_GROUP_SYSTEM |
+ BTRFS_BLOCK_GROUP_METADATA);
found->total_bytes = total_bytes;
found->bytes_used = bytes_used;
+ found->disk_used = bytes_used * factor;
found->bytes_pinned = 0;
found->bytes_reserved = 0;
found->bytes_readonly = 0;
@@ -2751,26 +2767,32 @@ u64 btrfs_reduce_alloc_profile(struct bt
return flags;
}
-static u64 btrfs_get_alloc_profile(struct btrfs_root *root, u64 data)
+static u64 get_alloc_profile(struct btrfs_root *root, u64 flags)
{
- struct btrfs_fs_info *info = root->fs_info;
- u64 alloc_profile;
+ if (flags & BTRFS_BLOCK_GROUP_DATA)
+ flags |= root->fs_info->avail_data_alloc_bits &
+ root->fs_info->data_alloc_profile;
+ else if (flags & BTRFS_BLOCK_GROUP_SYSTEM)
+ flags |= root->fs_info->avail_system_alloc_bits &
+ root->fs_info->system_alloc_profile;
+ else if (flags & BTRFS_BLOCK_GROUP_METADATA)
+ flags |= root->fs_info->avail_metadata_alloc_bits &
+ root->fs_info->metadata_alloc_profile;
+ return btrfs_reduce_alloc_profile(root, flags);
+}
- if (data) {
- 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) {
- alloc_profile = info->avail_system_alloc_bits &
- info->system_alloc_profile;
- data = BTRFS_BLOCK_GROUP_SYSTEM | alloc_profile;
- } else {
- alloc_profile = info->avail_metadata_alloc_bits &
- info->metadata_alloc_profile;
- data = BTRFS_BLOCK_GROUP_METADATA | alloc_profile;
- }
+static u64 btrfs_get_alloc_profile(struct btrfs_root *root, int data)
+{
+ u64 flags;
+
+ if (data)
+ flags = BTRFS_BLOCK_GROUP_DATA;
+ else if (root == root->fs_info->chunk_root)
+ flags = BTRFS_BLOCK_GROUP_SYSTEM;
+ else
+ flags = BTRFS_BLOCK_GROUP_METADATA;
- return btrfs_reduce_alloc_profile(root, data);
+ return get_alloc_profile(root, flags);
}
void btrfs_set_inode_space_info(struct btrfs_root *root, struct inode *inode)
@@ -3467,6 +3489,7 @@ static int update_block_group(struct btr
{
struct btrfs_block_group_cache *cache;
struct btrfs_fs_info *info = root->fs_info;
+ int factor;
u64 total = num_bytes;
u64 old_val;
u64 byte_in_group;
@@ -3485,6 +3508,12 @@ static int update_block_group(struct btr
cache = btrfs_lookup_block_group(info, bytenr);
if (!cache)
return -1;
+ if (cache->flags & (BTRFS_BLOCK_GROUP_DUP |
+ BTRFS_BLOCK_GROUP_RAID1 |
+ BTRFS_BLOCK_GROUP_RAID10))
+ factor = 2;
+ else
+ factor = 1;
byte_in_group = bytenr - cache->key.objectid;
WARN_ON(byte_in_group > cache->key.offset);
@@ -3497,18 +3526,20 @@ static int update_block_group(struct btr
old_val += num_bytes;
btrfs_set_block_group_used(&cache->item, old_val);
cache->reserved -= num_bytes;
- cache->space_info->bytes_used += num_bytes;
cache->space_info->bytes_reserved -= num_bytes;
+ cache->space_info->bytes_used += num_bytes;
+ cache->space_info->disk_used += num_bytes * factor;
if (cache->ro)
cache->space_info->bytes_readonly -= num_bytes;
spin_unlock(&cache->lock);
spin_unlock(&cache->space_info->lock);
} else {
old_val -= num_bytes;
+ btrfs_set_block_group_used(&cache->item, old_val);
cache->space_info->bytes_used -= num_bytes;
+ cache->space_info->disk_used -= num_bytes * factor;
if (cache->ro)
cache->space_info->bytes_readonly += num_bytes;
- btrfs_set_block_group_used(&cache->item, old_val);
spin_unlock(&cache->lock);
spin_unlock(&cache->space_info->lock);
if (mark_free) {
@@ -4133,6 +4164,22 @@ wait_block_group_cache_done(struct btrfs
return 0;
}
+static int get_block_group_index(struct btrfs_block_group_cache *cache)
+{
+ int index;
+ if (cache->flags & BTRFS_BLOCK_GROUP_RAID10)
+ index = 0;
+ else if (cache->flags & BTRFS_BLOCK_GROUP_RAID1)
+ index = 1;
+ else if (cache->flags & BTRFS_BLOCK_GROUP_DUP)
+ index = 2;
+ else if (cache->flags & BTRFS_BLOCK_GROUP_RAID0)
+ index = 3;
+ else
+ index = 4;
+ return index;
+}
+
enum btrfs_loop_type {
LOOP_FIND_IDEAL = 0,
LOOP_CACHING_NOWAIT = 1,
@@ -4166,6 +4213,7 @@ static noinline int find_free_extent(str
int done_chunk_alloc = 0;
struct btrfs_space_info *space_info;
int last_ptr_loop = 0;
+ int index = 0;
int loop = 0;
bool found_uncached_bg = false;
bool failed_cluster_refill = false;
@@ -4236,6 +4284,7 @@ ideal_cache:
btrfs_put_block_group(block_group);
up_read(&space_info->groups_sem);
} else {
+ index = get_block_group_index(block_group);
goto have_block_group;
}
} else if (block_group) {
@@ -4244,7 +4293,8 @@ ideal_cache:
}
search:
down_read(&space_info->groups_sem);
- list_for_each_entry(block_group, &space_info->block_groups, list) {
+ list_for_each_entry(block_group, &space_info->block_groups[index],
+ list) {
u64 offset;
int cached;
@@ -4467,10 +4517,14 @@ checks:
loop:
failed_cluster_refill = false;
failed_alloc = false;
+ BUG_ON(index != get_block_group_index(block_group));
btrfs_put_block_group(block_group);
}
up_read(&space_info->groups_sem);
+ if (!ins->objectid && ++index < BTRFS_NR_RAID_TYPES)
+ goto search;
+
/* LOOP_FIND_IDEAL, only search caching/cached bg''s, and
don''t wait for
* for them to make caching progress. Also
* determine the best possible bg to cache
@@ -4484,6 +4538,7 @@ loop:
if (!ins->objectid && loop < LOOP_NO_EMPTY_SIZE &&
(found_uncached_bg || empty_size || empty_cluster ||
allowed_chunk_alloc)) {
+ index = 0;
if (loop == LOOP_FIND_IDEAL && found_uncached_bg) {
found_uncached_bg = false;
loop++;
@@ -4566,6 +4621,7 @@ static void dump_space_info(struct btrfs
int dump_block_groups)
{
struct btrfs_block_group_cache *cache;
+ int index = 0;
spin_lock(&info->lock);
printk(KERN_INFO "space_info has %llu free, is %sfull\n",
@@ -4590,7 +4646,8 @@ static void dump_space_info(struct btrfs
return;
down_read(&info->groups_sem);
- list_for_each_entry(cache, &info->block_groups, list) {
+again:
+ list_for_each_entry(cache, &info->block_groups[index], list) {
spin_lock(&cache->lock);
printk(KERN_INFO "block group %llu has %llu bytes, %llu used "
"%llu pinned %llu reserved\n",
@@ -4602,6 +4659,8 @@ static void dump_space_info(struct btrfs
btrfs_dump_free_space(cache, bytes);
spin_unlock(&cache->lock);
}
+ if (++index < BTRFS_NR_RAID_TYPES)
+ goto again;
up_read(&info->groups_sem);
}
@@ -7446,6 +7505,16 @@ int btrfs_free_block_groups(struct btrfs
return 0;
}
+static void __link_block_group(struct btrfs_space_info *space_info,
+ struct btrfs_block_group_cache *cache)
+{
+ int index = get_block_group_index(cache);
+
+ down_write(&space_info->groups_sem);
+ list_add_tail(&cache->list, &space_info->block_groups[index]);
+ up_write(&space_info->groups_sem);
+}
+
int btrfs_read_block_groups(struct btrfs_root *root)
{
struct btrfs_path *path;
@@ -7467,10 +7536,8 @@ int btrfs_read_block_groups(struct btrfs
while (1) {
ret = find_first_block_group(root, path, &key);
- if (ret > 0) {
- ret = 0;
- goto error;
- }
+ if (ret > 0)
+ break;
if (ret != 0)
goto error;
@@ -7539,9 +7606,7 @@ int btrfs_read_block_groups(struct btrfs
cache->space_info->bytes_super += cache->bytes_super;
spin_unlock(&cache->space_info->lock);
- down_write(&space_info->groups_sem);
- list_add_tail(&cache->list, &space_info->block_groups);
- up_write(&space_info->groups_sem);
+ __link_block_group(space_info, cache);
ret = btrfs_add_block_group_cache(root->fs_info, cache);
BUG_ON(ret);
@@ -7550,6 +7615,22 @@ int btrfs_read_block_groups(struct btrfs
if (btrfs_chunk_readonly(root, cache->key.objectid))
set_block_group_readonly(cache);
}
+
+ list_for_each_entry_rcu(space_info, &root->fs_info->space_info,
list) {
+ if (!(get_alloc_profile(root, space_info->flags) &
+ (BTRFS_BLOCK_GROUP_RAID10 |
+ BTRFS_BLOCK_GROUP_RAID1 |
+ BTRFS_BLOCK_GROUP_DUP)))
+ continue;
+ /*
+ * avoid allocating from un-mirrored block group if there are
+ * mirrored block groups.
+ */
+ list_for_each_entry(cache, &space_info->block_groups[3], list)
+ set_block_group_readonly(cache);
+ list_for_each_entry(cache, &space_info->block_groups[4], list)
+ set_block_group_readonly(cache);
+ }
ret = 0;
error:
btrfs_free_path(path);
@@ -7613,9 +7694,7 @@ int btrfs_make_block_group(struct btrfs_
cache->space_info->bytes_super += cache->bytes_super;
spin_unlock(&cache->space_info->lock);
- down_write(&cache->space_info->groups_sem);
- list_add_tail(&cache->list,
&cache->space_info->block_groups);
- up_write(&cache->space_info->groups_sem);
+ __link_block_group(cache->space_info, cache);
ret = btrfs_add_block_group_cache(root->fs_info, cache);
BUG_ON(ret);
diff -urp 2/fs/btrfs/super.c 3/fs/btrfs/super.c
--- 2/fs/btrfs/super.c 2010-04-26 17:23:52.920839989 +0800
+++ 3/fs/btrfs/super.c 2010-04-26 17:23:52.930829876 +0800
@@ -713,34 +713,18 @@ static int btrfs_statfs(struct dentry *d
struct list_head *head = &root->fs_info->space_info;
struct btrfs_space_info *found;
u64 total_used = 0;
- u64 data_used = 0;
int bits = dentry->d_sb->s_blocksize_bits;
__be32 *fsid = (__be32 *)root->fs_info->fsid;
rcu_read_lock();
- list_for_each_entry_rcu(found, head, list) {
- if (found->flags & (BTRFS_BLOCK_GROUP_DUP|
- BTRFS_BLOCK_GROUP_RAID10|
- BTRFS_BLOCK_GROUP_RAID1)) {
- total_used += found->bytes_used;
- if (found->flags & BTRFS_BLOCK_GROUP_DATA)
- data_used += found->bytes_used;
- else
- data_used += found->total_bytes;
- }
-
- total_used += found->bytes_used;
- if (found->flags & BTRFS_BLOCK_GROUP_DATA)
- data_used += found->bytes_used;
- else
- data_used += found->total_bytes;
- }
+ list_for_each_entry_rcu(found, head, list)
+ total_used += found->disk_used;
rcu_read_unlock();
buf->f_namelen = BTRFS_NAME_LEN;
buf->f_blocks = btrfs_super_total_bytes(disk_super) >> bits;
buf->f_bfree = buf->f_blocks - (total_used >> bits);
- buf->f_bavail = buf->f_blocks - (data_used >> bits);
+ buf->f_bavail = buf->f_bfree;
buf->f_bsize = dentry->d_sb->s_blocksize;
buf->f_type = BTRFS_SUPER_MAGIC;
--
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