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btrfs: move split_extent_map to extent_map.c

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split_extent_map doesn't have anything to do with the other code in
inode.c, so move it to extent_map.c.

This also allows marking replace_extent_mapping static.

Reviewed-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
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:
Christoph Hellwig 2023-05-24 17:03:09 +02:00 committed by David Sterba
parent 3887653c44
commit a6f3e205e4
3 changed files with 95 additions and 98 deletions
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98
fs/btrfs/extent_map.c
View File

@ -504,10 +504,10 @@ void remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em)
RB_CLEAR_NODE(&em->rb_node);
}
void replace_extent_mapping(struct extent_map_tree *tree,
struct extent_map *cur,
struct extent_map *new,
int modified)
static void replace_extent_mapping(struct extent_map_tree *tree,
struct extent_map *cur,
struct extent_map *new,
int modified)
{
lockdep_assert_held_write(&tree->lock);
@ -961,3 +961,93 @@ int btrfs_replace_extent_map_range(struct btrfs_inode *inode,
return ret;
}
/*
* Split off the first pre bytes from the extent_map at [start, start + len]
*
* This function is used when an ordered_extent needs to be split.
*/
int split_extent_map(struct btrfs_inode *inode, u64 start, u64 len, u64 pre)
{
struct extent_map_tree *em_tree = &inode->extent_tree;
struct extent_map *em;
struct extent_map *split_pre = NULL;
struct extent_map *split_mid = NULL;
int ret = 0;
unsigned long flags;
ASSERT(pre != 0);
ASSERT(pre < len);
split_pre = alloc_extent_map();
if (!split_pre)
return -ENOMEM;
split_mid = alloc_extent_map();
if (!split_mid) {
ret = -ENOMEM;
goto out_free_pre;
}
lock_extent(&inode->io_tree, start, start + len - 1, NULL);
write_lock(&em_tree->lock);
em = lookup_extent_mapping(em_tree, start, len);
if (!em) {
ret = -EIO;
goto out_unlock;
}
ASSERT(em->len == len);
ASSERT(!test_bit(EXTENT_FLAG_COMPRESSED, &em->flags));
ASSERT(em->block_start < EXTENT_MAP_LAST_BYTE);
ASSERT(test_bit(EXTENT_FLAG_PINNED, &em->flags));
ASSERT(!test_bit(EXTENT_FLAG_LOGGING, &em->flags));
ASSERT(!list_empty(&em->list));
flags = em->flags;
clear_bit(EXTENT_FLAG_PINNED, &em->flags);
/* First, replace the em with a new extent_map starting from * em->start */
split_pre->start = em->start;
split_pre->len = pre;
split_pre->orig_start = split_pre->start;
split_pre->block_start = em->block_start;
split_pre->block_len = split_pre->len;
split_pre->orig_block_len = split_pre->block_len;
split_pre->ram_bytes = split_pre->len;
split_pre->flags = flags;
split_pre->compress_type = em->compress_type;
split_pre->generation = em->generation;
replace_extent_mapping(em_tree, em, split_pre, 1);
/*
* Now we only have an extent_map at:
* [em->start, em->start + pre]
*/
/* Insert the middle extent_map. */
split_mid->start = em->start + pre;
split_mid->len = em->len - pre;
split_mid->orig_start = split_mid->start;
split_mid->block_start = em->block_start + pre;
split_mid->block_len = split_mid->len;
split_mid->orig_block_len = split_mid->block_len;
split_mid->ram_bytes = split_mid->len;
split_mid->flags = flags;
split_mid->compress_type = em->compress_type;
split_mid->generation = em->generation;
add_extent_mapping(em_tree, split_mid, 1);
/* Once for us */
free_extent_map(em);
/* Once for the tree */
free_extent_map(em);
out_unlock:
write_unlock(&em_tree->lock);
unlock_extent(&inode->io_tree, start, start + len - 1, NULL);
free_extent_map(split_mid);
out_free_pre:
free_extent_map(split_pre);
return ret;
}

5
fs/btrfs/extent_map.h
View File

@ -90,10 +90,7 @@ struct extent_map *lookup_extent_mapping(struct extent_map_tree *tree,
int add_extent_mapping(struct extent_map_tree *tree,
struct extent_map *em, int modified);
void remove_extent_mapping(struct extent_map_tree *tree, struct extent_map *em);
void replace_extent_mapping(struct extent_map_tree *tree,
struct extent_map *cur,
struct extent_map *new,
int modified);
int split_extent_map(struct btrfs_inode *inode, u64 start, u64 len, u64 pre);
struct extent_map *alloc_extent_map(void);
void free_extent_map(struct extent_map *em);

90
fs/btrfs/inode.c
View File

@ -2714,96 +2714,6 @@ void btrfs_clear_delalloc_extent(struct btrfs_inode *inode,
}
}
/*
* Split off the first pre bytes from the extent_map at [start, start + len]
*
* This function is intended to be used only for extract_ordered_extent().
*/
static int split_extent_map(struct btrfs_inode *inode, u64 start, u64 len, u64 pre)
{
struct extent_map_tree *em_tree = &inode->extent_tree;
struct extent_map *em;
struct extent_map *split_pre = NULL;
struct extent_map *split_mid = NULL;
int ret = 0;
unsigned long flags;
ASSERT(pre != 0);
ASSERT(pre < len);
split_pre = alloc_extent_map();
if (!split_pre)
return -ENOMEM;
split_mid = alloc_extent_map();
if (!split_mid) {
ret = -ENOMEM;
goto out_free_pre;
}
lock_extent(&inode->io_tree, start, start + len - 1, NULL);
write_lock(&em_tree->lock);
em = lookup_extent_mapping(em_tree, start, len);
if (!em) {
ret = -EIO;
goto out_unlock;
}
ASSERT(em->len == len);
ASSERT(!test_bit(EXTENT_FLAG_COMPRESSED, &em->flags));
ASSERT(em->block_start < EXTENT_MAP_LAST_BYTE);
ASSERT(test_bit(EXTENT_FLAG_PINNED, &em->flags));
ASSERT(!test_bit(EXTENT_FLAG_LOGGING, &em->flags));
ASSERT(!list_empty(&em->list));
flags = em->flags;
clear_bit(EXTENT_FLAG_PINNED, &em->flags);
/* First, replace the em with a new extent_map starting from * em->start */
split_pre->start = em->start;
split_pre->len = pre;
split_pre->orig_start = split_pre->start;
split_pre->block_start = em->block_start;
split_pre->block_len = split_pre->len;
split_pre->orig_block_len = split_pre->block_len;
split_pre->ram_bytes = split_pre->len;
split_pre->flags = flags;
split_pre->compress_type = em->compress_type;
split_pre->generation = em->generation;
replace_extent_mapping(em_tree, em, split_pre, 1);
/*
* Now we only have an extent_map at:
* [em->start, em->start + pre]
*/
/* Insert the middle extent_map. */
split_mid->start = em->start + pre;
split_mid->len = em->len - pre;
split_mid->orig_start = split_mid->start;
split_mid->block_start = em->block_start + pre;
split_mid->block_len = split_mid->len;
split_mid->orig_block_len = split_mid->block_len;
split_mid->ram_bytes = split_mid->len;
split_mid->flags = flags;
split_mid->compress_type = em->compress_type;
split_mid->generation = em->generation;
add_extent_mapping(em_tree, split_mid, 1);
/* Once for us */
free_extent_map(em);
/* Once for the tree */
free_extent_map(em);
out_unlock:
write_unlock(&em_tree->lock);
unlock_extent(&inode->io_tree, start, start + len - 1, NULL);
free_extent_map(split_mid);
out_free_pre:
free_extent_map(split_pre);
return ret;
}
int btrfs_extract_ordered_extent(struct btrfs_bio *bbio,
struct btrfs_ordered_extent *ordered)
{