From: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Date: Thu, 8 Nov 2018 13:01:01 +0000 (+0100)
Subject: block/loop: Don't grab "struct file" for vfs_getattr() operation.
X-Git-Tag: v4.19.17~22
X-Git-Url: http://review.tizen.org/git/?a=commitdiff_plain;h=f5d3c785c1d3a0beb84f1ac66f06a8d61a689a77;p=platform%2Fkernel%2Flinux-rpi.git

block/loop: Don't grab "struct file" for vfs_getattr() operation.

commit b1ab5fa309e6c49e4e06270ec67dd7b3e9971d04 upstream.

vfs_getattr() needs "struct path" rather than "struct file".
Let's use path_get()/path_put() rather than get_file()/fput().

Signed-off-by: Tetsuo Handa <penguin-kernel@I-love.SAKURA.ne.jp>
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: Jens Axboe <axboe@kernel.dk>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>
---

diff --git a/drivers/block/loop.c b/drivers/block/loop.c
index ea9debf..50c81ff 100644
--- a/drivers/block/loop.c
+++ b/drivers/block/loop.c
@@ -1205,7 +1205,7 @@ loop_set_status(struct loop_device *lo, const struct loop_info64 *info)
 static int
 loop_get_status(struct loop_device *lo, struct loop_info64 *info)
 {
-	struct file *file;
+	struct path path;
 	struct kstat stat;
 	int ret;
 
@@ -1230,16 +1230,16 @@ loop_get_status(struct loop_device *lo, struct loop_info64 *info)
 	}
 
 	/* Drop lo_ctl_mutex while we call into the filesystem. */
-	file = get_file(lo->lo_backing_file);
+	path = lo->lo_backing_file->f_path;
+	path_get(&path);
 	mutex_unlock(&lo->lo_ctl_mutex);
-	ret = vfs_getattr(&file->f_path, &stat, STATX_INO,
-			  AT_STATX_SYNC_AS_STAT);
+	ret = vfs_getattr(&path, &stat, STATX_INO, AT_STATX_SYNC_AS_STAT);
 	if (!ret) {
 		info->lo_device = huge_encode_dev(stat.dev);
 		info->lo_inode = stat.ino;
 		info->lo_rdevice = huge_encode_dev(stat.rdev);
 	}
-	fput(file);
+	path_put(&path);
 	return ret;
 }