mirror O_APPEND and O_DIRECT into iocb->ki_flags

... avoiding write_iter/fcntl races.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

1 files changed, 15 insertions, 0 deletions

diff --git a/include/linux/fs.h b/include/linux/fs.h
index b4aa400ac723..b1d7db28c13c 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -315,6 +315,8 @@ struct address_space;
 struct writeback_control;
 
 #define IOCB_EVENTFD            (1 << 0)
+#define IOCB_APPEND             (1 << 1)
+#define IOCB_DIRECT             (1 << 2)
 
 struct kiocb {
         struct file             *ki_filp;
@@ -329,10 +331,13 @@ static inline bool is_sync_kiocb(struct kiocb *kiocb)
         return kiocb->ki_complete == NULL;
 }
 
+static inline int iocb_flags(struct file *file);
+
 static inline void init_sync_kiocb(struct kiocb *kiocb, struct file *filp)
 {
         *kiocb = (struct kiocb) {
                 .ki_filp = filp,
+                .ki_flags = iocb_flags(filp),
         };
 }
 
@@ -2779,6 +2784,16 @@ static inline bool io_is_direct(struct file *filp)
         return (filp->f_flags & O_DIRECT) || IS_DAX(file_inode(filp));
 }
 
+static inline int iocb_flags(struct file *file)
+{
+        int res = 0;
+        if (file->f_flags & O_APPEND)
+                res |= IOCB_APPEND;
+        if (io_is_direct(file))
+                res |= IOCB_DIRECT;
+        return res;
+}
+
 static inline ino_t parent_ino(struct dentry *dentry)
 {
         ino_t res;