[PATCH v2] fs: remove stale and duplicate forward declarations

[Yuto Ohnuki <ytohnuki@amazon.com>]

Remove the following unnecessary forward declarations from fs.h, which
improves maintainability.

- struct hd_geometry: became unused in fs.h when
  block_device_operations was moved to blkdev.h in commit 08f858512151
  ("[PATCH] move block_device_operations to blkdev.h"). The forward
  declaration is now added to blkdev.h where it is actually used.

- struct iovec: became unused when aio_read/aio_write were removed in
  commit 8436318205b9 ("->aio_read and ->aio_write removed")

- struct iov_iter: duplicate forward declaration. This removes the
  redundant second declaration, added in commit 293bc9822fa9
  ("new methods: ->read_iter() and ->write_iter()")

Reported-by: kernel test robot <lkp@intel.com>
Closes: https://lore.kernel.org/oe-kbuild-all/202512301303.s7YWTZHA-lkp@intel.com/
Closes: https://lore.kernel.org/oe-kbuild-all/202512302139.Wl0soAlz-lkp@intel.com/
Closes: https://lore.kernel.org/oe-kbuild-all/202512302105.pmzYfmcV-lkp@intel.com/
Closes: https://lore.kernel.org/oe-kbuild-all/202512302125.FNgHwu5z-lkp@intel.com/
Closes: https://lore.kernel.org/oe-kbuild-all/202512302108.nIV8r5ES-lkp@intel.com/
Signed-off-by: Yuto Ohnuki <ytohnuki@amazon.com>
---
Changes in v2:
- Add forward declaration of struct hd_geometry to blkdev.h to fix
  build errors reported by kernel test robot.
- Verified with allmodconfig build and all configs reported by 
  kernel test robot.

v1: https://lore.kernel.org/lkml/20251229071401.98146-1-ytohnuki@amazon.com/
---
 include/linux/blkdev.h | 1 +
 include/linux/fs.h     | 3 ---
 2 files changed, 1 insertion(+), 3 deletions(-)

diff --git a/include/linux/blkdev.h b/include/linux/blkdev.h
index d463b9b5a0a5..0b5942e08754 100644
--- a/include/linux/blkdev.h
+++ b/include/linux/blkdev.h
@@ -38,6 +38,7 @@ struct blk_flush_queue;
 struct kiocb;
 struct pr_ops;
 struct rq_qos;
+struct hd_geometry;
 struct blk_report_zones_args;
 struct blk_queue_stats;
 struct blk_stat_callback;
diff --git a/include/linux/fs.h b/include/linux/fs.h
index 8b3dd145b25e..75c97faf8799 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -55,8 +55,6 @@ struct bdi_writeback;
 struct bio;
 struct io_comp_batch;
 struct fiemap_extent_info;
-struct hd_geometry;
-struct iovec;
 struct kiocb;
 struct kobject;
 struct pipe_inode_info;
@@ -1917,7 +1915,6 @@ struct dir_context {
  */
 #define COPY_FILE_SPLICE		(1 << 0)
 
-struct iov_iter;
 struct io_uring_cmd;
 struct offset_ctx;
 
-- 
2.50.1




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