btrfs: change btrfs_encoded_read() so that reading of extent is done by caller

Change the behaviour of btrfs_encoded_read() so that if it needs to read
an extent from disk, it leaves the extent and inode locked and returns
-EIOCBQUEUED. The caller is then responsible for doing the I/O via
btrfs_encoded_read_regular() and unlocking the extent and inode.

Signed-off-by: Mark Harmstone <[email protected]>
Reviewed-by: David Sterba <[email protected]>
Signed-off-by: David Sterba <[email protected]>

1 files changed, 8 insertions, 1 deletions

diff --git a/fs/btrfs/btrfs_inode.h b/fs/btrfs/btrfs_inode.h
index 157fd3f4cb33..2817f0cc692b 100644
--- a/fs/btrfs/btrfs_inode.h
+++ b/fs/btrfs/btrfs_inode.h
@@ -615,7 +615,14 @@ int btrfs_encoded_read_regular_fill_pages(struct btrfs_inode *inode,
 					  u64 disk_bytenr, u64 disk_io_size,
 					  struct page **pages);
 ssize_t btrfs_encoded_read(struct kiocb *iocb, struct iov_iter *iter,
-			   struct btrfs_ioctl_encoded_io_args *encoded);
+			   struct btrfs_ioctl_encoded_io_args *encoded,
+			   struct extent_state **cached_state,
+			   u64 *disk_bytenr, u64 *disk_io_size);
+ssize_t btrfs_encoded_read_regular(struct kiocb *iocb, struct iov_iter *iter,
+				   u64 start, u64 lockend,
+				   struct extent_state **cached_state,
+				   u64 disk_bytenr, u64 disk_io_size,
+				   size_t count, bool compressed, bool *unlocked);
 ssize_t btrfs_do_encoded_write(struct kiocb *iocb, struct iov_iter *from,
 			       const struct btrfs_ioctl_encoded_io_args *encoded);