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btrfs: handle completed ordered extents in btrfs_split_ordered_extent 

To delay splitting ordered_extents to I/O completion time we need to be
able to handle fully completed ordered extents in
btrfs_split_ordered_extent.  Besides a bit of accounting this primarily
involved moving over the csums to the split bio for the range that it
covers, which is simple enough because we always have one
btrfs_ordered_sum per bio.

Reviewed-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 2023-05-24 17:03:15 +02:00 committed by David Sterba
parent 816f589b8d
commit 52b1fdca23
1 changed files with 32 additions and 8 deletions
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34
fs/btrfs/ordered-data.c
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@ -1141,9 +1141,11 @@ struct btrfs_ordered_extent *btrfs_split_ordered_extent(
struct btrfs_fs_info *fs_info = root->fs_info;
u64 file_offset = ordered->file_offset;
u64 disk_bytenr = ordered->disk_bytenr;
unsigned long flags = ordered->flags & BTRFS_ORDERED_TYPE_FLAGS;
unsigned long flags = ordered->flags;
struct btrfs_ordered_sum *sum, *tmpsum;
struct btrfs_ordered_extent *new;
struct rb_node *node;
u64 offset = 0;
trace_btrfs_ordered_extent_split(inode, ordered);
@ -1155,15 +1157,15 @@ struct btrfs_ordered_extent *btrfs_split_ordered_extent(
*/
if (WARN_ON_ONCE(len >= ordered->num_bytes))
return ERR_PTR(-EINVAL);
/* We cannot split once ordered extent is past end_bio. */
/* We cannot split partially completed ordered extents. */
if (ordered->bytes_left) {
ASSERT(!(flags & ~BTRFS_ORDERED_TYPE_FLAGS));
if (WARN_ON_ONCE(ordered->bytes_left != ordered->disk_num_bytes))
return ERR_PTR(-EINVAL);
}
/* We cannot split a compressed ordered extent. */
if (WARN_ON_ONCE(ordered->disk_num_bytes != ordered->num_bytes))
return ERR_PTR(-EINVAL);
/* Checksum list should be empty. */
if (WARN_ON_ONCE(!list_empty(&ordered->list)))
return ERR_PTR(-EINVAL);
new = alloc_ordered_extent(inode, file_offset, len, len, disk_bytenr,
len, 0, flags, ordered->compress_type);
@ -1186,7 +1188,29 @@ struct btrfs_ordered_extent *btrfs_split_ordered_extent(
ordered->disk_bytenr += len;
ordered->num_bytes -= len;
ordered->disk_num_bytes -= len;
if (test_bit(BTRFS_ORDERED_IO_DONE, &ordered->flags)) {
ASSERT(ordered->bytes_left == 0);
new->bytes_left = 0;
} else {
ordered->bytes_left -= len;
}
if (test_bit(BTRFS_ORDERED_TRUNCATED, &ordered->flags)) {
if (ordered->truncated_len > len) {
ordered->truncated_len -= len;
} else {
new->truncated_len = ordered->truncated_len;
ordered->truncated_len = 0;
}
}
list_for_each_entry_safe(sum, tmpsum, &ordered->list, list) {
if (offset == len)
break;
list_move_tail(&sum->list, &new->list);
offset += sum->len;
}
/* Re-insert the node */
node = tree_insert(&tree->tree, ordered->file_offset, &ordered->rb_node);