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btrfs: Remove extent_io_ops::set_bit_hook extent_io callback

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This callback is used to properly account delalloc extents for data
inodes (ordinary file inodes and freespace v1 inodes). Those can be
easily identified since they have their extent_io trees ->private_data
member point to the inode. Let's exploit this fact to remove the
needless indirection through extent_io_hooks and directly call the
function. Also give the function a name which reflects its purpose -
btrfs_set_delalloc_extent.

This patch also modified test_find_delalloc so that the extent_io_tree
used for testing doesn't have its ->private_data set which would have
caused a crash in btrfs_set_delalloc_extent due to the btrfs_inode->root
member not being initialised. The old version of the code also didn't
call set_bit_hook since the extent_io ops weren't set for the inode.  No
functional changes.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Nikolay Borisov
2018-11-01 14:09:50 +02:00
committed by David Sterba
parent 65a680f6b7
commit e06a1fc99c
5 changed files with 10 additions and 19 deletions
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12
fs/btrfs/inode.c
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@@ -1755,15 +1755,12 @@ static void btrfs_del_delalloc_inode(struct btrfs_root *root,
}
/*
* extent_io.c set_bit_hook, used to track delayed allocation
* bytes in this file, and to maintain the list of inodes that
* have pending delalloc work to be done.
* Properly track delayed allocation bytes in the inode and to maintain the
* list of inodes that have pending delalloc work to be done.
*/
static void btrfs_set_bit_hook(void *private_data,
struct extent_state *state, unsigned *bits)
void btrfs_set_delalloc_extent(struct inode *inode, struct extent_state *state,
unsigned *bits)
{
struct inode *inode = private_data;
struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
if ((*bits & EXTENT_DEFRAG) && !(*bits & EXTENT_DELALLOC))
@@ -10512,7 +10509,6 @@ static const struct extent_io_ops btrfs_extent_io_ops = {
.readpage_io_failed_hook = btrfs_readpage_io_failed_hook,
/* optional callbacks */
.set_bit_hook = btrfs_set_bit_hook,
.clear_bit_hook = btrfs_clear_bit_hook,
.merge_extent_hook = btrfs_merge_extent_hook,
.split_extent_hook = btrfs_split_extent_hook,