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btrfs: add function to create and return an ordered extent 

Currently, btrfs_add_ordered_extent allocates a new ordered extent, adds
it to the rb_tree, but doesn't return a referenced pointer to the
caller. There are cases where it is useful for the creator of a new
ordered_extent to hang on to such a pointer, so add a new function
btrfs_alloc_ordered_extent which is the same as
btrfs_add_ordered_extent, except it takes an additional reference count
and returns a pointer to the ordered_extent. Implement
btrfs_add_ordered_extent as btrfs_alloc_ordered_extent followed by
dropping the new reference and handling the IS_ERR case.

The type of flags in btrfs_alloc_ordered_extent and
btrfs_add_ordered_extent is changed from unsigned int to unsigned long
so it's unified with the other ordered extent functions.

Reviewed-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Naohiro Aota <naohiro.aota@wdc.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Tested-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Boris Burkov <boris@bur.io>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Boris Burkov 2023-03-28 14:19:47 +09:00 committed by David Sterba
parent cf32e41fa5
commit cf6d1aa482
2 changed files with 42 additions and 9 deletions
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46
fs/btrfs/ordered-data.c
View File

@ -160,14 +160,16 @@ static inline struct rb_node *tree_search(struct btrfs_ordered_inode_tree *tree,
* @compress_type: Compression algorithm used for data.
*
* Most of these parameters correspond to &struct btrfs_file_extent_item. The
* tree is given a single reference on the ordered extent that was inserted.
* tree is given a single reference on the ordered extent that was inserted, and
* the returned pointer is given a second reference.
*
* Return: 0 or -ENOMEM.
* Return: the new ordered extent or error pointer.
*/
int btrfs_add_ordered_extent(struct btrfs_inode *inode, u64 file_offset,
u64 num_bytes, u64 ram_bytes, u64 disk_bytenr,
u64 disk_num_bytes, u64 offset, unsigned flags,
int compress_type)
struct btrfs_ordered_extent *btrfs_alloc_ordered_extent(
struct btrfs_inode *inode, u64 file_offset,
u64 num_bytes, u64 ram_bytes, u64 disk_bytenr,
u64 disk_num_bytes, u64 offset, unsigned long flags,
int compress_type)
{
struct btrfs_root *root = inode->root;
struct btrfs_fs_info *fs_info = root->fs_info;
@ -181,7 +183,7 @@ int btrfs_add_ordered_extent(struct btrfs_inode *inode, u64 file_offset,
/* For nocow write, we can release the qgroup rsv right now */
ret = btrfs_qgroup_free_data(inode, NULL, file_offset, num_bytes);
if (ret < 0)
return ret;
return ERR_PTR(ret);
ret = 0;
} else {
/*
@ -190,11 +192,11 @@ int btrfs_add_ordered_extent(struct btrfs_inode *inode, u64 file_offset,
*/
ret = btrfs_qgroup_release_data(inode, file_offset, num_bytes);
if (ret < 0)
return ret;
return ERR_PTR(ret);
}
entry = kmem_cache_zalloc(btrfs_ordered_extent_cache, GFP_NOFS);
if (!entry)
return -ENOMEM;
return ERR_PTR(-ENOMEM);
entry->file_offset = file_offset;
entry->num_bytes = num_bytes;
@ -256,6 +258,32 @@ int btrfs_add_ordered_extent(struct btrfs_inode *inode, u64 file_offset,
btrfs_mod_outstanding_extents(inode, 1);
spin_unlock(&inode->lock);
/* One ref for the returned entry to match semantics of lookup. */
refcount_inc(&entry->refs);
return entry;
}
/*
* Add a new btrfs_ordered_extent for the range, but drop the reference instead
* of returning it to the caller.
*/
int btrfs_add_ordered_extent(struct btrfs_inode *inode, u64 file_offset,
u64 num_bytes, u64 ram_bytes, u64 disk_bytenr,
u64 disk_num_bytes, u64 offset, unsigned flags,
int compress_type)
{
struct btrfs_ordered_extent *ordered;
ordered = btrfs_alloc_ordered_extent(inode, file_offset, num_bytes,
ram_bytes, disk_bytenr,
disk_num_bytes, offset, flags,
compress_type);
if (IS_ERR(ordered))
return PTR_ERR(ordered);
btrfs_put_ordered_extent(ordered);
return 0;
}

5
fs/btrfs/ordered-data.h
View File

@ -178,6 +178,11 @@ void btrfs_mark_ordered_io_finished(struct btrfs_inode *inode,
bool btrfs_dec_test_ordered_pending(struct btrfs_inode *inode,
struct btrfs_ordered_extent **cached,
u64 file_offset, u64 io_size);
struct btrfs_ordered_extent *btrfs_alloc_ordered_extent(
struct btrfs_inode *inode, u64 file_offset,
u64 num_bytes, u64 ram_bytes, u64 disk_bytenr,
u64 disk_num_bytes, u64 offset, unsigned long flags,
int compress_type);
int btrfs_add_ordered_extent(struct btrfs_inode *inode, u64 file_offset,
u64 num_bytes, u64 ram_bytes, u64 disk_bytenr,
u64 disk_num_bytes, u64 offset, unsigned flags,