FS needs to add the fmode capability in order to support atomic writes
during file open (refer kiocb_set_rw_flags()). Let's check if inode can
support atomic writes then enable FMODE_CAN_ATOMIC_WRITE.
Signed-off-by: Ritesh Harjani (IBM) <ritesh.list@xxxxxxxxx>
---
fs/ext4/ext4.h | 7 +++++++
fs/ext4/file.c | 3 +++
2 files changed, 10 insertions(+)
diff --git a/fs/ext4/ext4.h b/fs/ext4/ext4.h
index a41e56c2c628..78475ff14aa2 100644
--- a/fs/ext4/ext4.h
+++ b/fs/ext4/ext4.h
@@ -3863,6 +3863,13 @@ static inline int ext4_buffer_uptodate(struct buffer_head *bh)
extern int ext4_block_write_begin(handle_t *handle, struct folio *folio,
loff_t pos, unsigned len,
get_block_t *get_block);
+
+static inline bool ext4_inode_can_atomicwrite(struct inode *inode)
+{
+ return ext4_test_mount_flag(inode->i_sb, EXT4_MF_ATOMIC_WRITE) &&
+ S_ISREG(inode->i_mode);
+}
+
#endif /* __KERNEL__ */
#define EFSBADCRC EBADMSG /* Bad CRC detected */
diff --git a/fs/ext4/file.c b/fs/ext4/file.c
index b06c5d34bbd2..f9516121a036 100644
--- a/fs/ext4/file.c
+++ b/fs/ext4/file.c
@@ -898,6 +898,9 @@ static int ext4_file_open(struct inode *inode, struct file *filp)
return ret;
}
+ if (ext4_inode_can_atomicwrite(inode))
+ filp->f_mode |= FMODE_CAN_ATOMIC_WRITE;
+
filp->f_mode |= FMODE_NOWAIT | FMODE_CAN_ODIRECT;
return dquot_file_open(inode, filp);
}
--
2.46.0
