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Btrfs: fix reservation code for mixed block groups 

The global reservation stuff tries to add together DATA and METADATA used in
order to figure out how much to reserve for everything, but this doesn't work
right for mixed block groups.  Instead if we have mixed block groups just set
data used to 0.  Also with mixed block groups we will use bytes_may_use for
keeping track of delalloc bytes, so we need to take that into account in our
reservation calculations.

Signed-off-by: Josef Bacik <josef@redhat.com>
This commit is contained in:
Josef Bacik 2010-10-15 15:13:32 -04:00
parent 89a55897a2
commit 6d48755d02
1 changed files with 6 additions and 2 deletions
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8
fs/btrfs/extent-tree.c
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@ -3213,7 +3213,8 @@ static int reserve_metadata_bytes(struct btrfs_block_rsv *block_rsv,
spin_lock(&space_info->lock);
unused = space_info->bytes_used + space_info->bytes_reserved +
space_info->bytes_pinned + space_info->bytes_readonly;
space_info->bytes_pinned + space_info->bytes_readonly +
space_info->bytes_may_use;
if (unused < space_info->total_bytes)
unused = space_info->total_bytes - unused;
@ -3507,6 +3508,8 @@ static u64 calc_global_metadata_size(struct btrfs_fs_info *fs_info)
sinfo = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_METADATA);
spin_lock(&sinfo->lock);
if (sinfo->flags & BTRFS_BLOCK_GROUP_DATA)
data_used = 0;
meta_used = sinfo->bytes_used;
spin_unlock(&sinfo->lock);
@ -3534,7 +3537,8 @@ static void update_global_block_rsv(struct btrfs_fs_info *fs_info)
block_rsv->size = num_bytes;
num_bytes = sinfo->bytes_used + sinfo->bytes_pinned +
sinfo->bytes_reserved + sinfo->bytes_readonly;
sinfo->bytes_reserved + sinfo->bytes_readonly +
sinfo->bytes_may_use;
if (sinfo->total_bytes > num_bytes) {
num_bytes = sinfo->total_bytes - num_bytes;