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btrfs: simplify extent map splitting and rename split_zoned_em

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split_zoned_em is only ever asked to split out the beginning of an extent
map.  Change it to only take a len to split out instead of a pre and post
region.

Also rename the function to split_extent_map as there is nothing zoned
device specific about it.

Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Tested-by: Johannes Thumshirn <johannes.thumshirn@wdc.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Christoph Hellwig 2023-03-28 14:19:54 +09:00 committed by David Sterba
parent f0792b792d
commit 2e38a84bc6
1 changed files with 26 additions and 51 deletions
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77
fs/btrfs/inode.c
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@ -2512,37 +2512,31 @@ void btrfs_clear_delalloc_extent(struct btrfs_inode *inode,
}
/*
* Split an extent_map at [start, start + len]
* 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_zoned_em(struct btrfs_inode *inode, u64 start, u64 len,
u64 pre, u64 post)
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;
struct extent_map *split_post = NULL;
int ret = 0;
unsigned long flags;
/* Sanity check */
if (pre == 0 && post == 0)
return 0;
ASSERT(pre != 0);
ASSERT(pre < len);
split_pre = alloc_extent_map();
if (pre)
split_mid = alloc_extent_map();
if (post)
split_post = alloc_extent_map();
if (!split_pre || (pre && !split_mid) || (post && !split_post)) {
if (!split_pre)
return -ENOMEM;
split_mid = alloc_extent_map();
if (!split_mid) {
ret = -ENOMEM;
goto out;
goto out_free_pre;
}
ASSERT(pre + post < len);
lock_extent(&inode->io_tree, start, start + len - 1, NULL);
write_lock(&em_tree->lock);
em = lookup_extent_mapping(em_tree, start, len);
@ -2563,7 +2557,7 @@ static int split_zoned_em(struct btrfs_inode *inode, u64 start, u64 len,
/* First, replace the em with a new extent_map starting from * em->start */
split_pre->start = em->start;
split_pre->len = (pre ? pre : em->len - post);
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;
@ -2577,38 +2571,21 @@ static int split_zoned_em(struct btrfs_inode *inode, u64 start, u64 len,
/*
* Now we only have an extent_map at:
* [em->start, em->start + pre] if pre != 0
* [em->start, em->start + em->len - post] if pre == 0
* [em->start, em->start + pre]
*/
if (pre) {
/* Insert the middle extent_map */
split_mid->start = em->start + pre;
split_mid->len = em->len - pre - post;
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);
}
if (post) {
split_post->start = em->start + em->len - post;
split_post->len = post;
split_post->orig_start = split_post->start;
split_post->block_start = em->block_start + em->len - post;
split_post->block_len = split_post->len;
split_post->orig_block_len = split_post->block_len;
split_post->ram_bytes = split_post->len;
split_post->flags = flags;
split_post->compress_type = em->compress_type;
split_post->generation = em->generation;
add_extent_mapping(em_tree, split_post, 1);
}
/* 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);
@ -2618,11 +2595,9 @@ static int split_zoned_em(struct btrfs_inode *inode, u64 start, u64 len,
out_unlock:
write_unlock(&em_tree->lock);
unlock_extent(&inode->io_tree, start, start + len - 1, NULL);
out:
free_extent_map(split_pre);
free_extent_map(split_mid);
free_extent_map(split_post);
out_free_pre:
free_extent_map(split_pre);
return ret;
}
@ -2653,7 +2628,7 @@ blk_status_t btrfs_extract_ordered_extent(struct btrfs_bio *bbio)
ret = btrfs_split_ordered_extent(ordered, len);
if (ret)
goto out;
ret = split_zoned_em(inode, bbio->file_offset, ordered_len, len, 0);
ret = split_extent_map(inode, bbio->file_offset, ordered_len, len);
out:
btrfs_put_ordered_extent(ordered);
return errno_to_blk_status(ret);