ext4: Check if inode uses extents in ext4_inode_can_atomic_write()

EXT4 only supports doing atomic write on inodes which uses extents, so
add a check in ext4_inode_can_atomic_write() which gets called during
open.

Reviewed-by: Ojaswin Mujoo <ojaswin@linux.ibm.com>
Acked-by: Darrick J. Wong <djwong@kernel.org>
Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@gmail.com>
Link: https://patch.msgid.link/86bb502c979398a736ab371d8f35f6866a477f6c.1747337952.git.ritesh.list@gmail.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>

diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index 923580be3cd6de45e6794a936df934d771c68905..bc2deb5bfe77a16b898c2c6f2cadcdc913d27e6a 100644 (file)
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -3870,7 +3870,9 @@ static inline int ext4_buffer_uptodate(struct buffer_head *bh)
 static inline bool ext4_inode_can_atomic_write(struct inode *inode)
 {
 
-       return S_ISREG(inode->i_mode) && EXT4_SB(inode->i_sb)->s_awu_min > 0;
+       return S_ISREG(inode->i_mode) &&
+               ext4_test_inode_flag(inode, EXT4_INODE_EXTENTS) &&
+               EXT4_SB(inode->i_sb)->s_awu_min > 0;
 }
 
 extern int ext4_block_write_begin(handle_t *handle, struct folio *folio,