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Btrfs: resizer: don't hold the fs_mutex for long periods of time 

Signed-off-by: Chris Mason <chris.mason@oracle.com>
This commit is contained in:
Chris Mason 2008-01-04 16:47:16 -05:00
parent 1372f8e609
commit 725c8463ea
1 changed files with 21 additions and 1 deletions
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22
fs/btrfs/extent-tree.c
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@ -2331,6 +2331,7 @@ int btrfs_shrink_extent_tree(struct btrfs_root *root, u64 new_size)
struct extent_buffer *leaf;
u32 nritems;
int ret;
int progress = 0;
btrfs_set_super_total_bytes(&info->super_copy, new_size);
block_group_cache = &info->block_group_cache;
@ -2383,6 +2384,19 @@ next:
}
btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
if (progress && need_resched()) {
memcpy(&key, &found_key, sizeof(key));
mutex_unlock(&root->fs_info->fs_mutex);
cond_resched();
mutex_lock(&root->fs_info->fs_mutex);
btrfs_release_path(root, path);
btrfs_search_slot(NULL, root, &key, path, 0, 0);
progress = 0;
goto next;
}
progress = 1;
if (btrfs_key_type(&found_key) != BTRFS_EXTENT_ITEM_KEY ||
found_key.objectid + found_key.offset <= cur_byte) {
path->slots[0]++;
@ -2442,7 +2456,7 @@ bg_next:
*/
memcpy(&key, &found_key, sizeof(key));
btrfs_release_path(root, path);
continue;
goto resched_check;
}
btrfs_item_key_to_cpu(leaf, &found_key, path->slots[0]);
@ -2465,6 +2479,12 @@ bg_next:
key.objectid = found_key.objectid + 1;
btrfs_del_item(trans, root, path);
btrfs_release_path(root, path);
resched_check:
if (need_resched()) {
mutex_unlock(&root->fs_info->fs_mutex);
cond_resched();
mutex_lock(&root->fs_info->fs_mutex);
}
}
clear_extent_dirty(&info->free_space_cache, new_size, (u64)-1,
GFP_NOFS);