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Btrfs: move extent map specific code to extent_map.c

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These helpers are extent map specific, move them to extent_map.c.

Signed-off-by: Liu Bo <bo.li.liu@oracle.com>
Reviewed-by: Josef Bacik <jbacik@fb.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Liu Bo
2018-01-05 12:51:11 -07:00
committed by David Sterba
parent 7b4df058b0
commit c04e61b5e4
4 changed files with 127 additions and 109 deletions
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107
fs/btrfs/inode.c
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@@ -6817,68 +6817,6 @@ out_fail_inode:
goto out_fail;
}
/* Find next extent map of a given extent map, caller needs to ensure locks */
static struct extent_map *next_extent_map(struct extent_map *em)
{
struct rb_node *next;
next = rb_next(&em->rb_node);
if (!next)
return NULL;
return container_of(next, struct extent_map, rb_node);
}
static struct extent_map *prev_extent_map(struct extent_map *em)
{
struct rb_node *prev;
prev = rb_prev(&em->rb_node);
if (!prev)
return NULL;
return container_of(prev, struct extent_map, rb_node);
}
/* helper for btfs_get_extent. Given an existing extent in the tree,
* the existing extent is the nearest extent to map_start,
* and an extent that you want to insert, deal with overlap and insert
* the best fitted new extent into the tree.
*/
static int merge_extent_mapping(struct extent_map_tree *em_tree,
struct extent_map *existing,
struct extent_map *em,
u64 map_start)
{
struct extent_map *prev;
struct extent_map *next;
u64 start;
u64 end;
u64 start_diff;
BUG_ON(map_start < em->start || map_start >= extent_map_end(em));
if (existing->start > map_start) {
next = existing;
prev = prev_extent_map(next);
} else {
prev = existing;
next = next_extent_map(prev);
}
start = prev ? extent_map_end(prev) : em->start;
start = max_t(u64, start, em->start);
end = next ? next->start : extent_map_end(em);
end = min_t(u64, end, extent_map_end(em));
start_diff = start - em->start;
em->start = start;
em->len = end - start;
if (em->block_start < EXTENT_MAP_LAST_BYTE &&
!test_bit(EXTENT_FLAG_COMPRESSED, &em->flags)) {
em->block_start += start_diff;
em->block_len = em->len;
}
return add_extent_mapping(em_tree, em, 0);
}
static noinline int uncompress_inline(struct btrfs_path *path,
struct page *page,
size_t pg_offset, u64 extent_offset,
@@ -6925,51 +6863,6 @@ static noinline int uncompress_inline(struct btrfs_path *path,
return ret;
}
int btrfs_add_extent_mapping(struct extent_map_tree *em_tree,
struct extent_map **em_in, u64 start, u64 len)
{
int ret;
struct extent_map *em = *em_in;
ret = add_extent_mapping(em_tree, 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
*/
if (ret == -EEXIST) {
struct extent_map *existing;
ret = 0;
existing = search_extent_mapping(em_tree, start, len);
/*
* existing will always be non-NULL, since there must be
* extent causing the -EEXIST.
*/
if (start >= existing->start &&
start < extent_map_end(existing)) {
free_extent_map(em);
*em_in = existing;
ret = 0;
} else {
/*
* 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);
free_extent_map(existing);
if (ret) {
free_extent_map(em);
*em_in = NULL;
}
}
}
ASSERT(ret == 0 || ret == -EEXIST);
return ret;
}
/*
* a bit scary, this does extent mapping from logical file offset to the disk.
* the ugly parts come from merging extents from the disk with the in-ram