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btrfs: pass the extent map tree's inode to add_extent_mapping()

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Extent maps are always added to an inode's extent map tree, so there's no
need to pass the extent map tree explicitly to add_extent_mapping().

In order to facilitate an upcoming change that adds a shrinker for extent
maps, change add_extent_mapping() to receive the inode instead of its
extent map tree.

Reviewed-by: Qu Wenruo <wqu@suse.com>
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Signed-off-by: Filipe Manana <fdmanana@suse.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Filipe Manana 2024-01-17 11:54:39 +00:00 committed by David Sterba
parent e094f48040
commit 6c566def95
1 changed files with 16 additions and 18 deletions
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34
fs/btrfs/extent_map.c
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@ -355,21 +355,22 @@ static inline void setup_extent_mapping(struct extent_map_tree *tree,
}
/*
* Add new extent map to the extent tree
* Add a new extent map to an inode's extent map tree.
*
* @tree: tree to insert new map in
* @inode: the target inode
* @em: map to insert
* @modified: indicate whether the given @em should be added to the
* modified list, which indicates the extent needs to be logged
*
* Insert @em into @tree or perform a simple forward/backward merge with
* existing mappings. The extent_map struct passed in will be inserted
* into the tree directly, with an additional reference taken, or a
* reference dropped if the merge attempt was successful.
* Insert @em into the @inode's extent map tree or perform a simple
* forward/backward merge with existing mappings. The extent_map struct passed
* in will be inserted into the tree directly, with an additional reference
* taken, or a reference dropped if the merge attempt was successful.
*/
static int add_extent_mapping(struct extent_map_tree *tree,
static int add_extent_mapping(struct btrfs_inode *inode,
struct extent_map *em, int modified)
{
struct extent_map_tree *tree = &inode->extent_tree;
int ret;
lockdep_assert_held_write(&tree->lock);
@ -508,7 +509,7 @@ static struct extent_map *prev_extent_map(struct extent_map *em)
* and an extent that you want to insert, deal with overlap and insert
* the best fitted new extent into the tree.
*/
static noinline int merge_extent_mapping(struct extent_map_tree *em_tree,
static noinline int merge_extent_mapping(struct btrfs_inode *inode,
struct extent_map *existing,
struct extent_map *em,
u64 map_start)
@ -542,7 +543,7 @@ static noinline int merge_extent_mapping(struct extent_map_tree *em_tree,
em->block_start += start_diff;
em->block_len = em->len;
}
return add_extent_mapping(em_tree, em, 0);
return add_extent_mapping(inode, em, 0);
}
/*
@ -570,7 +571,6 @@ int btrfs_add_extent_mapping(struct btrfs_inode *inode,
{
int ret;
struct extent_map *em = *em_in;
struct extent_map_tree *em_tree = &inode->extent_tree;
struct btrfs_fs_info *fs_info = inode->root->fs_info;
/*
@ -580,7 +580,7 @@ int btrfs_add_extent_mapping(struct btrfs_inode *inode,
if (em->block_start == EXTENT_MAP_INLINE)
ASSERT(em->start == 0);
ret = add_extent_mapping(em_tree, em, 0);
ret = add_extent_mapping(inode, em, 0);
/* it is possible that someone inserted the extent into the tree
* while we had the lock dropped. It is also possible that
* an overlapping map exists in the tree
@ -588,7 +588,7 @@ int btrfs_add_extent_mapping(struct btrfs_inode *inode,
if (ret == -EEXIST) {
struct extent_map *existing;
existing = search_extent_mapping(em_tree, start, len);
existing = search_extent_mapping(&inode->extent_tree, start, len);
trace_btrfs_handle_em_exist(fs_info, existing, em, start, len);
@ -609,8 +609,7 @@ int btrfs_add_extent_mapping(struct btrfs_inode *inode,
* The existing extent map is the one nearest to
* the [start, start + len) range which overlaps
*/
ret = merge_extent_mapping(em_tree, existing,
em, start);
ret = merge_extent_mapping(inode, existing, em, start);
if (WARN_ON(ret)) {
free_extent_map(em);
*em_in = NULL;
@ -818,8 +817,7 @@ void btrfs_drop_extent_map_range(struct btrfs_inode *inode, u64 start, u64 end,
} else {
int ret;
ret = add_extent_mapping(em_tree, split,
modified);
ret = add_extent_mapping(inode, split, modified);
/* Logic error, shouldn't happen. */
ASSERT(ret == 0);
if (WARN_ON(ret != 0) && modified)
@ -909,7 +907,7 @@ int btrfs_replace_extent_map_range(struct btrfs_inode *inode,
do {
btrfs_drop_extent_map_range(inode, new_em->start, end, false);
write_lock(&tree->lock);
ret = add_extent_mapping(tree, new_em, modified);
ret = add_extent_mapping(inode, new_em, modified);
write_unlock(&tree->lock);
} while (ret == -EEXIST);
@ -990,7 +988,7 @@ int split_extent_map(struct btrfs_inode *inode, u64 start, u64 len, u64 pre,
split_mid->ram_bytes = split_mid->len;
split_mid->flags = flags;
split_mid->generation = em->generation;
add_extent_mapping(em_tree, split_mid, 1);
add_extent_mapping(inode, split_mid, 1);
/* Once for us */
free_extent_map(em);