[PATCH v2] fuse: keep inode->i_blkbits constant

[Joanne Koong <joannelkoong@gmail.com>]

With fuse now using iomap for writeback handling, inode blkbits changes
are problematic because iomap relies on inode->i_blkbits for its
internal bitmap logic. Currently we change inode->i_blkbits in fuse to
match the attr->blksize value passed in by the server.

This commit keeps inode->i_blkbits constant in fuse. Any attr->blksize
values passed in by the server will not update inode->i_blkbits. The
client-side behavior for stat is unaffected, stat will still reflect the
blocksize passed in by the server.

Signed-off-by: Joanne Koong <joannelkoong@gmail.com>
Fixes: ef7e7cbb32 ("fuse: use iomap for writeback")
---
Changelog:
v1: https://lore.kernel.org/linux-fsdevel/20250804210743.1239373-1-joannelkoong@gmail.com/#t
v1 -> v2:
  * Remove warning and keep stat() behavior unchanged (Miklos)
  * Dropped 2nd patch
---
 fs/fuse/inode.c | 5 -----
 1 file changed, 5 deletions(-)

diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index bfe8d8af46f3..33632c32ba6c 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -285,11 +285,6 @@ void fuse_change_attributes_common(struct inode *inode, struct fuse_attr *attr,
 		}
 	}
 
-	if (attr->blksize != 0)
-		inode->i_blkbits = ilog2(attr->blksize);
-	else
-		inode->i_blkbits = inode->i_sb->s_blocksize_bits;
-
 	/*
 	 * Don't set the sticky bit in i_mode, unless we want the VFS
 	 * to check permissions.  This prevents failures due to the
-- 
2.47.3