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btrfs: separate superblock items out of fs_info

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fs_info has now ~9kb, more than fits into one page. This will cause
mount failure when memory is too fragmented. Top space consumers are
super block structures super_copy and super_for_commit, ~2.8kb each.
Allocate them dynamically. fs_info will be ~3.5kb. (measured on x86_64)

Add a wrapper for freeing fs_info and all of it's dynamically allocated
members.

Signed-off-by: David Sterba <dsterba@suse.cz>
This commit is contained in:
David Sterba
2011-04-13 15:41:04 +02:00
committed by Chris Mason
parent c8174313a8
commit 6c41761fc6
12 changed files with 78 additions and 76 deletions
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16
fs/btrfs/extent-tree.c
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@ -3209,7 +3209,7 @@ static int should_alloc_chunk(struct btrfs_root *root,
* about 1% of the FS size.
*/
if (force == CHUNK_ALLOC_LIMITED) {
thresh = btrfs_super_total_bytes(&root->fs_info->super_copy);
thresh = btrfs_super_total_bytes(root->fs_info->super_copy);
thresh = max_t(u64, 64 * 1024 * 1024,
div_factor_fine(thresh, 1));
@ -3231,7 +3231,7 @@ static int should_alloc_chunk(struct btrfs_root *root,
if (num_allocated + alloc_bytes < div_factor(num_bytes, 8))
return 0;
thresh = btrfs_super_total_bytes(&root->fs_info->super_copy);
thresh = btrfs_super_total_bytes(root->fs_info->super_copy);
/* 256MB or 5% of the FS */
thresh = max_t(u64, 256 * 1024 * 1024, div_factor_fine(thresh, 5));
@ -3843,7 +3843,7 @@ static u64 calc_global_metadata_size(struct btrfs_fs_info *fs_info)
u64 num_bytes;
u64 meta_used;
u64 data_used;
int csum_size = btrfs_super_csum_size(&fs_info->super_copy);
int csum_size = btrfs_super_csum_size(fs_info->super_copy);
sinfo = __find_space_info(fs_info, BTRFS_BLOCK_GROUP_DATA);
spin_lock(&sinfo->lock);
@ -4222,12 +4222,12 @@ static int update_block_group(struct btrfs_trans_handle *trans,
/* block accounting for super block */
spin_lock(&info->delalloc_lock);
old_val = btrfs_super_bytes_used(&info->super_copy);
old_val = btrfs_super_bytes_used(info->super_copy);
if (alloc)
old_val += num_bytes;
else
old_val -= num_bytes;
btrfs_set_super_bytes_used(&info->super_copy, old_val);
btrfs_set_super_bytes_used(info->super_copy, old_val);
spin_unlock(&info->delalloc_lock);
while (total) {
@ -7127,9 +7127,9 @@ int btrfs_read_block_groups(struct btrfs_root *root)
return -ENOMEM;
path->reada = 1;
cache_gen = btrfs_super_cache_generation(&root->fs_info->super_copy);
cache_gen = btrfs_super_cache_generation(root->fs_info->super_copy);
if (btrfs_test_opt(root, SPACE_CACHE) &&
btrfs_super_generation(&root->fs_info->super_copy) != cache_gen)
btrfs_super_generation(root->fs_info->super_copy) != cache_gen)
need_clear = 1;
if (btrfs_test_opt(root, CLEAR_CACHE))
need_clear = 1;
@ -7458,7 +7458,7 @@ int btrfs_init_space_info(struct btrfs_fs_info *fs_info)
int mixed = 0;
int ret;
disk_super = &fs_info->super_copy;
disk_super = fs_info->super_copy;
if (!btrfs_super_root(disk_super))
return 1;