ext4: fast commit may miss tracking unwritten range during ftruncate

commit 9725958bb75cdfa10f2ec11526fdb23e7485e8e4 upstream.

If use FALLOC_FL_KEEP_SIZE to alloc unwritten range at bottom, the
inode->i_size will not include the unwritten range. When call
ftruncate with fast commit enabled, it will miss to track the
unwritten range.

Change to trace the full range during ftruncate.

Signed-off-by: Xin Yin <yinxin.x@bytedance.com>
Reviewed-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com>
Link: https://lore.kernel.org/r/20211223032337.5198-3-yinxin.x@bytedance.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>

diff --git a/fs/ext4/inode.c b/fs/ext4/inode.c
index 899639974a55e51662688871bc625f29696196ce..53173e71cd7a2a033fc8da4742da677a7052c767 100644 (file)
--- a/fs/ext4/inode.c
+++ b/fs/ext4/inode.c
@@ -5414,8 +5414,7 @@ int ext4_setattr(struct user_namespace *mnt_userns, struct dentry *dentry,
                                ext4_fc_track_range(handle, inode,
                                        (attr->ia_size > 0 ? attr->ia_size - 1 : 0) >>
                                        inode->i_sb->s_blocksize_bits,
-                                       (oldsize > 0 ? oldsize - 1 : 0) >>
-                                       inode->i_sb->s_blocksize_bits);
+                                       EXT_MAX_BLOCKS - 1);
                        else
                                ext4_fc_track_range(
                                        handle, inode,