splice: report related fsnotify events

The fsnotify ACCESS and MODIFY event are missing when manipulating a file
with splice(2).

Signed-off-by: Chung-Chiang Cheng <cccheng@synology.com>
Reviewed-by: Amir Goldstein <amir73il@gmail.com>
Acked-by: Jan Kara <jack@suse.cz>
Message-Id: <20230322062519.409752-1-cccheng@synology.com>
Signed-off-by: Christian Brauner <brauner@kernel.org>

diff --git a/fs/splice.c b/fs/splice.c
index 2c3dec2..0af8d15 100644 (file)
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -30,6 +30,7 @@
 #include <linux/export.h>
 #include <linux/syscalls.h>
 #include <linux/uio.h>
+#include <linux/fsnotify.h>
 #include <linux/security.h>
 #include <linux/gfp.h>
 #include <linux/socket.h>
@@ -1165,6 +1166,9 @@ long do_splice(struct file *in, loff_t *off_in, struct file *out,
                ret = do_splice_from(ipipe, out, &offset, len, flags);
                file_end_write(out);
 
+               if (ret > 0)
+                       fsnotify_modify(out);
+
                if (!off_out)
                        out->f_pos = offset;
                else
@@ -1188,6 +1192,10 @@ long do_splice(struct file *in, loff_t *off_in, struct file *out,
                        flags |= SPLICE_F_NONBLOCK;
 
                ret = splice_file_to_pipe(in, opipe, &offset, len, flags);
+
+               if (ret > 0)
+                       fsnotify_access(in);
+
                if (!off_in)
                        in->f_pos = offset;
                else