btrfs: remove the io_failure_record infrastructure

struct io_failure_record and the io_failure_tree tree are unused now,
so remove them. This in turn makes struct btrfs_inode smaller by 16
bytes.

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>

1 files changed, 0 insertions, 260 deletions

diff --git a/fs/btrfs/extent_io.c b/fs/btrfs/extent_io.c
index 88def7fd8598..41bcc0bfe56a 100644
--- a/fs/btrfs/extent_io.c
+++ b/fs/btrfs/extent_io.c
@@ -515,266 +515,6 @@ void extent_clear_unlock_delalloc(struct btrfs_inode *inode, u64 start, u64 end,
 			       start, end, page_ops, NULL);
 }
 
-static int insert_failrec(struct btrfs_inode *inode,
-			  struct io_failure_record *failrec)
-{
-	struct rb_node *exist;
-
-	spin_lock(&inode->io_failure_lock);
-	exist = rb_simple_insert(&inode->io_failure_tree, failrec->bytenr,
-				 &failrec->rb_node);
-	spin_unlock(&inode->io_failure_lock);
-
-	return (exist == NULL) ? 0 : -EEXIST;
-}
-
-static struct io_failure_record *get_failrec(struct btrfs_inode *inode, u64 start)
-{
-	struct rb_node *node;
-	struct io_failure_record *failrec = ERR_PTR(-ENOENT);
-
-	spin_lock(&inode->io_failure_lock);
-	node = rb_simple_search(&inode->io_failure_tree, start);
-	if (node)
-		failrec = rb_entry(node, struct io_failure_record, rb_node);
-	spin_unlock(&inode->io_failure_lock);
-	return failrec;
-}
-
-static void free_io_failure(struct btrfs_inode *inode,
-			    struct io_failure_record *rec)
-{
-	spin_lock(&inode->io_failure_lock);
-	rb_erase(&rec->rb_node, &inode->io_failure_tree);
-	spin_unlock(&inode->io_failure_lock);
-
-	kfree(rec);
-}
-
-static int next_mirror(const struct io_failure_record *failrec, int cur_mirror)
-{
-	if (cur_mirror == failrec->num_copies)
-		return cur_mirror + 1 - failrec->num_copies;
-	return cur_mirror + 1;
-}
-
-static int prev_mirror(const struct io_failure_record *failrec, int cur_mirror)
-{
-	if (cur_mirror == 1)
-		return failrec->num_copies;
-	return cur_mirror - 1;
-}
-
-/*
- * each time an IO finishes, we do a fast check in the IO failure tree
- * to see if we need to process or clean up an io_failure_record
- */
-int btrfs_clean_io_failure(struct btrfs_inode *inode, u64 start,
-			   struct page *page, unsigned int pg_offset)
-{
-	struct btrfs_fs_info *fs_info = inode->root->fs_info;
-	struct extent_io_tree *io_tree = &inode->io_tree;
-	u64 ino = btrfs_ino(inode);
-	u64 locked_start, locked_end;
-	struct io_failure_record *failrec;
-	int mirror;
-	int ret;
-
-	failrec = get_failrec(inode, start);
-	if (IS_ERR(failrec))
-		return 0;
-
-	BUG_ON(!failrec->this_mirror);
-
-	if (sb_rdonly(fs_info->sb))
-		goto out;
-
-	ret = find_first_extent_bit(io_tree, failrec->bytenr, &locked_start,
-				    &locked_end, EXTENT_LOCKED, NULL);
-	if (ret || locked_start > failrec->bytenr ||
-	    locked_end < failrec->bytenr + failrec->len - 1)
-		goto out;
-
-	mirror = failrec->this_mirror;
-	do {
-		mirror = prev_mirror(failrec, mirror);
-		btrfs_repair_io_failure(fs_info, ino, start, failrec->len,
-				  failrec->logical, page, pg_offset, mirror);
-	} while (mirror != failrec->failed_mirror);
-
-out:
-	free_io_failure(inode, failrec);
-	return 0;
-}
-
-/*
- * Can be called when
- * - hold extent lock
- * - under ordered extent
- * - the inode is freeing
- */
-void btrfs_free_io_failure_record(struct btrfs_inode *inode, u64 start, u64 end)
-{
-	struct io_failure_record *failrec;
-	struct rb_node *node, *next;
-
-	if (RB_EMPTY_ROOT(&inode->io_failure_tree))
-		return;
-
-	spin_lock(&inode->io_failure_lock);
-	node = rb_simple_search_first(&inode->io_failure_tree, start);
-	while (node) {
-		failrec = rb_entry(node, struct io_failure_record, rb_node);
-		if (failrec->bytenr > end)
-			break;
-
-		next = rb_next(node);
-		rb_erase(&failrec->rb_node, &inode->io_failure_tree);
-		kfree(failrec);
-
-		node = next;
-	}
-	spin_unlock(&inode->io_failure_lock);
-}
-
-static struct io_failure_record *btrfs_get_io_failure_record(struct inode *inode,
-							     struct btrfs_bio *bbio,
-							     unsigned int bio_offset)
-{
-	struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
-	u64 start = bbio->file_offset + bio_offset;
-	struct io_failure_record *failrec;
-	const u32 sectorsize = fs_info->sectorsize;
-	int ret;
-
-	failrec = get_failrec(BTRFS_I(inode), start);
-	if (!IS_ERR(failrec)) {
-		btrfs_debug(fs_info,
-	"Get IO Failure Record: (found) logical=%llu, start=%llu, len=%llu",
-			failrec->logical, failrec->bytenr, failrec->len);
-		/*
-		 * when data can be on disk more than twice, add to failrec here
-		 * (e.g. with a list for failed_mirror) to make
-		 * clean_io_failure() clean all those errors at once.
-		 */
-		ASSERT(failrec->this_mirror == bbio->mirror_num);
-		ASSERT(failrec->len == fs_info->sectorsize);
-		return failrec;
-	}
-
-	failrec = kzalloc(sizeof(*failrec), GFP_NOFS);
-	if (!failrec)
-		return ERR_PTR(-ENOMEM);
-
-	RB_CLEAR_NODE(&failrec->rb_node);
-	failrec->bytenr = start;
-	failrec->len = sectorsize;
-	failrec->failed_mirror = bbio->mirror_num;
-	failrec->this_mirror = bbio->mirror_num;
-	failrec->logical = (bbio->iter.bi_sector << SECTOR_SHIFT) + bio_offset;
-
-	btrfs_debug(fs_info,
-		    "new io failure record logical %llu start %llu",
-		    failrec->logical, start);
-
-	failrec->num_copies = btrfs_num_copies(fs_info, failrec->logical, sectorsize);
-	if (failrec->num_copies == 1) {
-		/*
-		 * We only have a single copy of the data, so don't bother with
-		 * all the retry and error correction code that follows. No
-		 * matter what the error is, it is very likely to persist.
-		 */
-		btrfs_debug(fs_info,
-			"cannot repair logical %llu num_copies %d",
-			failrec->logical, failrec->num_copies);
-		kfree(failrec);
-		return ERR_PTR(-EIO);
-	}
-
-	/* Set the bits in the private failure tree */
-	ret = insert_failrec(BTRFS_I(inode), failrec);
-	if (ret) {
-		kfree(failrec);
-		return ERR_PTR(ret);
-	}
-
-	return failrec;
-}
-
-int btrfs_repair_one_sector(struct btrfs_inode *inode, struct btrfs_bio *failed_bbio,
-			    u32 bio_offset, struct page *page, unsigned int pgoff,
-			    bool submit_buffered)
-{
-	u64 start = failed_bbio->file_offset + bio_offset;
-	struct io_failure_record *failrec;
-	struct btrfs_fs_info *fs_info = inode->root->fs_info;
-	struct bio *failed_bio = &failed_bbio->bio;
-	const int icsum = bio_offset >> fs_info->sectorsize_bits;
-	struct bio *repair_bio;
-	struct btrfs_bio *repair_bbio;
-
-	btrfs_debug(fs_info,
-		   "repair read error: read error at %llu", start);
-
-	BUG_ON(bio_op(failed_bio) == REQ_OP_WRITE);
-
-	failrec = btrfs_get_io_failure_record(&inode->vfs_inode, failed_bbio, bio_offset);
-	if (IS_ERR(failrec))
-		return PTR_ERR(failrec);
-
-	/*
-	 * There are two premises:
-	 * a) deliver good data to the caller
-	 * b) correct the bad sectors on disk
-	 *
-	 * Since we're only doing repair for one sector, we only need to get
-	 * a good copy of the failed sector and if we succeed, we have setup
-	 * everything for btrfs_repair_io_failure to do the rest for us.
-	 */
-	failrec->this_mirror = next_mirror(failrec, failrec->this_mirror);
-	if (failrec->this_mirror == failrec->failed_mirror) {
-		btrfs_debug(fs_info,
-			"failed to repair num_copies %d this_mirror %d failed_mirror %d",
-			failrec->num_copies, failrec->this_mirror, failrec->failed_mirror);
-		free_io_failure(inode, failrec);
-		return -EIO;
-	}
-
-	repair_bio = btrfs_bio_alloc(1, REQ_OP_READ, failed_bbio->inode,
-				     failed_bbio->end_io,
-				     failed_bbio->private);
-	repair_bbio = btrfs_bio(repair_bio);
-	repair_bbio->file_offset = start;
-	repair_bio->bi_iter.bi_sector = failrec->logical >> 9;
-
-	if (failed_bbio->csum) {
-		const u32 csum_size = fs_info->csum_size;
-
-		repair_bbio->csum = repair_bbio->csum_inline;
-		memcpy(repair_bbio->csum,
-		       failed_bbio->csum + csum_size * icsum, csum_size);
-	}
-
-	bio_add_page(repair_bio, page, failrec->len, pgoff);
-
-	btrfs_debug(fs_info,
-		    "repair read error: submitting new read to mirror %d",
-		    failrec->this_mirror);
-
-	/*
-	 * At this point we have a bio, so any errors from bio submission will
-	 * be handled by the endio on the repair_bio, so we can't return an
-	 * error here.
-	 */
-	if (submit_buffered)
-		btrfs_submit_data_read_bio(inode, repair_bio,
-					   failrec->this_mirror, 0);
-	else
-		btrfs_submit_dio_repair_bio(inode, repair_bio, failrec->this_mirror);
-
-	return BLK_STS_OK;
-}
-
 static void end_page_read(struct page *page, bool uptodate, u64 start, u32 len)
 {
 	struct btrfs_fs_info *fs_info = btrfs_sb(page->mapping->host->i_sb);