iv/linux
1
0
Fork 0
Code Issues Pull Requests Actions Packages Projects Releases Wiki Activity

btrfs: qgroup: Refactor btrfs_qgroup_insert_dirty_extent()

Browse Source 
Refactor btrfs_qgroup_insert_dirty_extent() function, to two functions:
1. btrfs_qgroup_insert_dirty_extent_nolock()
   Almost the same with original code.
   For delayed_ref usage, which has delayed refs locked.

   Change the return value type to int, since caller never needs the
   pointer, but only needs to know if they need to free the allocated
   memory.

2. btrfs_qgroup_insert_dirty_extent()
   The more encapsulated version.

   Will do the delayed_refs lock, memory allocation, quota enabled check
   and other things.

The original design is to keep exported functions to minimal, but since
more btrfs hacks exposed, like replacing path in balance, we need to
record dirty extents manually, so we have to add such functions.

Also, add comment for both functions, to info developers how to keep
qgroup correct when doing hacks.

Cc: Mark Fasheh <mfasheh@suse.de>
Signed-off-by: Qu Wenruo <quwenruo@cn.fujitsu.com>
Reviewed-and-Tested-by: Goldwyn Rodrigues <rgoldwyn@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
Signed-off-by: Chris Mason <clm@fb.com>
This commit is contained in:
Qu Wenruo
2016-08-15 10:36:50 +08:00
committed by Chris Mason
parent d06f23d6a9
commit cb93b52cc0
4 changed files with 71 additions and 47 deletions
Download Patch File Download Diff File Expand all files Collapse all files

37
fs/btrfs/extent-tree.c
View File

@ -8521,35 +8521,6 @@ reada:
wc->reada_slot = slot;
}
/*
* These may not be seen by the usual inc/dec ref code so we have to
* add them here.
*/
static int record_one_subtree_extent(struct btrfs_trans_handle *trans,
struct btrfs_root *root, u64 bytenr,
u64 num_bytes)
{
struct btrfs_qgroup_extent_record *qrecord;
struct btrfs_delayed_ref_root *delayed_refs;
qrecord = kmalloc(sizeof(*qrecord), GFP_NOFS);
if (!qrecord)
return -ENOMEM;
qrecord->bytenr = bytenr;
qrecord->num_bytes = num_bytes;
qrecord->old_roots = NULL;
delayed_refs = &trans->transaction->delayed_refs;
spin_lock(&delayed_refs->lock);
if (btrfs_qgroup_insert_dirty_extent(trans->fs_info,
delayed_refs, qrecord))
kfree(qrecord);
spin_unlock(&delayed_refs->lock);
return 0;
}
static int account_leaf_items(struct btrfs_trans_handle *trans,
struct btrfs_root *root,
struct extent_buffer *eb)
@ -8583,7 +8554,8 @@ static int account_leaf_items(struct btrfs_trans_handle *trans,
num_bytes = btrfs_file_extent_disk_num_bytes(eb, fi);
ret = record_one_subtree_extent(trans, root, bytenr, num_bytes);
ret = btrfs_qgroup_insert_dirty_extent(trans, root->fs_info,
bytenr, num_bytes, GFP_NOFS);
if (ret)
return ret;
}
@ -8732,8 +8704,9 @@ walk_down:
btrfs_set_lock_blocking_rw(eb, BTRFS_READ_LOCK);
path->locks[level] = BTRFS_READ_LOCK_BLOCKING;
ret = record_one_subtree_extent(trans, root, child_bytenr,
root->nodesize);
ret = btrfs_qgroup_insert_dirty_extent(trans,
root->fs_info, child_bytenr,
root->nodesize, GFP_NOFS);
if (ret)
goto out;
}