btrfs: stop tracking failed reads in the I/O tree

There is a separate I/O failure tree to track the fail reads, so remove
the extra EXTENT_DAMAGED bit in the I/O tree as it's set but never used.
Reviewed-by: Josef Bacik <josef@toxicpanda.com>
Reviewed-by: Qu Wenruo <wqu@suse.com>
Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>

fs/btrfs/extent-io-tree.h

@@ -17,7 +17,6 @@ struct io_failure_record;
 #define EXTENT_NODATASUM	(1U << 7)
 #define EXTENT_CLEAR_META_RESV	(1U << 8)
 #define EXTENT_NEED_WAIT	(1U << 9)
-#define EXTENT_DAMAGED		(1U << 10)
 #define EXTENT_NORESERVE	(1U << 11)
 #define EXTENT_QGROUP_RESERVED	(1U << 12)
 #define EXTENT_CLEAR_DATA_RESV	(1U << 13)

fs/btrfs/extent_io.c

@@ -519,20 +519,14 @@ static struct io_failure_record *get_failrec(struct btrfs_inode *inode, u64 star
 	return failrec;
 }
 
-static int free_io_failure(struct btrfs_inode *inode,
+static void free_io_failure(struct btrfs_inode *inode,
 			    struct io_failure_record *rec)
 {
-	int ret;
-
 	spin_lock(&inode->io_failure_lock);
 	rb_erase(&rec->rb_node, &inode->io_failure_tree);
 	spin_unlock(&inode->io_failure_lock);
 
-	ret = clear_extent_bits(&inode->io_tree, rec->bytenr,
-				rec->bytenr + rec->len - 1,
-				EXTENT_DAMAGED);
 	kfree(rec);
-	return ret;
 }
 
 /*
@@ -742,7 +736,6 @@ static struct io_failure_record *btrfs_get_io_failure_record(struct inode *inode
 	struct btrfs_fs_info *fs_info = btrfs_sb(inode->i_sb);
 	u64 start = bbio->file_offset + bio_offset;
 	struct io_failure_record *failrec;
-	struct extent_io_tree *tree = &BTRFS_I(inode)->io_tree;
 	const u32 sectorsize = fs_info->sectorsize;
 	int ret;
 
@@ -796,12 +789,6 @@ static struct io_failure_record *btrfs_get_io_failure_record(struct inode *inode
 		kfree(failrec);
 		return ERR_PTR(ret);
 	}
-	ret = set_extent_bits(tree, start, start + sectorsize - 1,
-			      EXTENT_DAMAGED);
-	if (ret) {
-		free_io_failure(BTRFS_I(inode), failrec);
-		return ERR_PTR(ret);
-	}
 
 	return failrec;
 }

fs/btrfs/tests/extent-io-tests.c

@@ -80,7 +80,6 @@ static void extent_flag_to_str(const struct extent_state *state, char *dest)
 	PRINT_ONE_FLAG(state, dest, cur, NODATASUM);
 	PRINT_ONE_FLAG(state, dest, cur, CLEAR_META_RESV);
 	PRINT_ONE_FLAG(state, dest, cur, NEED_WAIT);
-	PRINT_ONE_FLAG(state, dest, cur, DAMAGED);
 	PRINT_ONE_FLAG(state, dest, cur, NORESERVE);
 	PRINT_ONE_FLAG(state, dest, cur, QGROUP_RESERVED);
 	PRINT_ONE_FLAG(state, dest, cur, CLEAR_DATA_RESV);

include/trace/events/btrfs.h

@@ -153,7 +153,6 @@ FLUSH_STATES
 	{ EXTENT_NODATASUM,		"NODATASUM"},		\
 	{ EXTENT_CLEAR_META_RESV,	"CLEAR_META_RESV"},	\
 	{ EXTENT_NEED_WAIT,		"NEED_WAIT"},		\
-	{ EXTENT_DAMAGED,		"DAMAGED"},		\
 	{ EXTENT_NORESERVE,		"NORESERVE"},		\
 	{ EXTENT_QGROUP_RESERVED,	"QGROUP_RESERVED"},	\
 	{ EXTENT_CLEAR_DATA_RESV,	"CLEAR_DATA_RESV"},	\