[PATCH 6.1 654/798] erofs: get rid of erofs_inode_datablocks()

[Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>]

6.1-stable review patch.  If anyone has any objections, please let me know.

------------------

From: Gao Xiang <hsiangkao@xxxxxxxxxxxxxxxxx>

commit 4efdec36dc9907628e590a68193d6d8e5e74d032 upstream.

erofs_inode_datablocks() has the only one caller, let's just get
rid of it entirely.  No logic changes.

Reviewed-by: Yue Hu <huyue2@xxxxxxxxxxx>
Reviewed-by: Jingbo Xu <jefflexu@xxxxxxxxxxxxxxxxx>
Reviewed-by: Chao Yu <chao@xxxxxxxxxx>
Stable-dep-of: 9ed50b8231e3 ("erofs: fix incorrect symlink detection in fast symlink")
Link: https://lore.kernel.org/r/20230204093040.97967-1-hsiangkao@xxxxxxxxxxxxxxxxx
[ Gao Xiang: apply this to 6.6.y to avoid further backport twists
             due to obsoleted EROFS_BLKSIZ. ]
Signed-off-by: Gao Xiang <hsiangkao@xxxxxxxxxxxxxxxxx>
Signed-off-by: Greg Kroah-Hartman <gregkh@xxxxxxxxxxxxxxxxxxx>
---
Obsoleted EROFS_BLKSIZ impedes efforts to backport
 9ed50b8231e3 ("erofs: fix incorrect symlink detection in fast symlink")
 9e2f9d34dd12 ("erofs: handle overlapped pclusters out of crafted images properly")

To avoid further bugfix conflicts due to random EROFS_BLKSIZs
around the whole codebase, just backport the dependencies for 6.1.y.

 fs/erofs/internal.h |    6 ------
 fs/erofs/namei.c    |   18 +++++-------------
 2 files changed, 5 insertions(+), 19 deletions(-)

--- a/fs/erofs/internal.h
+++ b/fs/erofs/internal.h
@@ -347,12 +347,6 @@ static inline erofs_off_t erofs_iloc(str
 		(EROFS_I(inode)->nid << sbi->islotbits);
 }
 
-static inline unsigned long erofs_inode_datablocks(struct inode *inode)
-{
-	/* since i_size cannot be changed */
-	return DIV_ROUND_UP(inode->i_size, EROFS_BLKSIZ);
-}
-
 static inline unsigned int erofs_bitrange(unsigned int value, unsigned int bit,
 					  unsigned int bits)
 {
--- a/fs/erofs/namei.c
+++ b/fs/erofs/namei.c
@@ -5,7 +5,6 @@
  * Copyright (C) 2022, Alibaba Cloud
  */
 #include "xattr.h"
-
 #include <trace/events/erofs.h>
 
 struct erofs_qstr {
@@ -87,19 +86,13 @@ static struct erofs_dirent *find_target_
 	return ERR_PTR(-ENOENT);
 }
 
-static void *find_target_block_classic(struct erofs_buf *target,
-				       struct inode *dir,
-				       struct erofs_qstr *name,
-				       int *_ndirents)
+static void *erofs_find_target_block(struct erofs_buf *target,
+		struct inode *dir, struct erofs_qstr *name, int *_ndirents)
 {
-	unsigned int startprfx, endprfx;
-	int head, back;
+	int head = 0, back = DIV_ROUND_UP(dir->i_size, EROFS_BLKSIZ) - 1;
+	unsigned int startprfx = 0, endprfx = 0;
 	void *candidate = ERR_PTR(-ENOENT);
 
-	startprfx = endprfx = 0;
-	head = 0;
-	back = erofs_inode_datablocks(dir) - 1;
-
 	while (head <= back) {
 		const int mid = head + (back - head) / 2;
 		struct erofs_buf buf = __EROFS_BUF_INITIALIZER;
@@ -180,8 +173,7 @@ int erofs_namei(struct inode *dir, const
 	qn.end = name->name + name->len;
 
 	ndirents = 0;
-
-	de = find_target_block_classic(&buf, dir, &qn, &ndirents);
+	de = erofs_find_target_block(&buf, dir, &qn, &ndirents);
 	if (IS_ERR(de))
 		return PTR_ERR(de);