fs: change write_begin/write_end interface to take struct kiocb *

Change the address_space_operations callbacks write_begin() and
write_end() to take struct kiocb * as the first argument instead of
struct file *.

Update all affected function prototypes, implementations, call sites,
and related documentation across VFS, filesystems, and block layer.

Part of a series refactoring address_space_operations write_begin and
write_end callbacks to use struct kiocb for passing write context and
flags.

Signed-off-by: Taotao Chen <chentaotao@didiglobal.com>
Link: https://lore.kernel.org/20250716093559.217344-4-chentaotao@didiglobal.com
Signed-off-by: Christian Brauner <brauner@kernel.org>

1 files changed, 10 insertions, 8 deletions

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index e6aa7ca6d842..9a16efd072bb 100644
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -1252,7 +1252,8 @@ int ext4_block_write_begin(handle_t *handle, struct folio *folio,
  * and the ext4_write_end().  So doing the jbd2_journal_start at the start of
  * ext4_write_begin() is the right place.
  */
-static int ext4_write_begin(struct file *file, struct address_space *mapping,
+static int ext4_write_begin(const struct kiocb *iocb,
+			    struct address_space *mapping,
 			    loff_t pos, unsigned len,
 			    struct folio **foliop, void **fsdata)
 {
@@ -1400,12 +1401,12 @@ static int write_end_fn(handle_t *handle, struct inode *inode,
 
 /*
  * We need to pick up the new inode size which generic_commit_write gave us
- * `file' can be NULL - eg, when called from page_symlink().
+ * `iocb` can be NULL - eg, when called from page_symlink().
  *
  * ext4 never places buffers on inode->i_mapping->i_private_list.  metadata
  * buffers are managed internally.
  */
-static int ext4_write_end(struct file *file,
+static int ext4_write_end(const struct kiocb *iocb,
 			  struct address_space *mapping,
 			  loff_t pos, unsigned len, unsigned copied,
 			  struct folio *folio, void *fsdata)
@@ -1510,7 +1511,7 @@ static void ext4_journalled_zero_new_buffers(handle_t *handle,
 	} while (bh != head);
 }
 
-static int ext4_journalled_write_end(struct file *file,
+static int ext4_journalled_write_end(const struct kiocb *iocb,
 				     struct address_space *mapping,
 				     loff_t pos, unsigned len, unsigned copied,
 				     struct folio *folio, void *fsdata)
@@ -3036,7 +3037,8 @@ static int ext4_nonda_switch(struct super_block *sb)
 	return 0;
 }
 
-static int ext4_da_write_begin(struct file *file, struct address_space *mapping,
+static int ext4_da_write_begin(const struct kiocb *iocb,
+			       struct address_space *mapping,
 			       loff_t pos, unsigned len,
 			       struct folio **foliop, void **fsdata)
 {
@@ -3054,7 +3056,7 @@ static int ext4_da_write_begin(struct file *file, struct address_space *mapping,
 
 	if (ext4_nonda_switch(inode->i_sb) || ext4_verity_in_progress(inode)) {
 		*fsdata = (void *)FALL_BACK_TO_NONDELALLOC;
-		return ext4_write_begin(file, mapping, pos,
+		return ext4_write_begin(iocb, mapping, pos,
 					len, foliop, fsdata);
 	}
 	*fsdata = (void *)0;
@@ -3195,7 +3197,7 @@ static int ext4_da_do_write_end(struct address_space *mapping,
 	return copied;
 }
 
-static int ext4_da_write_end(struct file *file,
+static int ext4_da_write_end(const struct kiocb *iocb,
 			     struct address_space *mapping,
 			     loff_t pos, unsigned len, unsigned copied,
 			     struct folio *folio, void *fsdata)
@@ -3204,7 +3206,7 @@ static int ext4_da_write_end(struct file *file,
 	int write_mode = (int)(unsigned long)fsdata;
 
 	if (write_mode == FALL_BACK_TO_NONDELALLOC)
-		return ext4_write_end(file, mapping, pos,
+		return ext4_write_end(iocb, mapping, pos,
 				      len, copied, folio, fsdata);
 
 	trace_ext4_da_write_end(inode, pos, len, copied);