ext4: avoid ext4_error()'s caused by ENOMEM in the truncate path

commit 73c384c0 upstream.

We can't fail in the truncate path without requiring an fsck.
Add work around for this by using a combination of retry loops
and the __GFP_NOFAIL flag.

From: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Signed-off-by: Anna Pendleton <pendleton@google.com>
Reviewed-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com>
Link: https://lore.kernel.org/r/20200507175028.15061-1-pendleton@google.com


Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Stable-dep-of: c26ab357 ("ext4: fix slab-use-after-free in ext4_split_extent_at()")
[v5.4: resolved contextual conflict in __read_extent_tree_block]
Signed-off-by: Shaoying Xu <shaoyi@amazon.com>
Signed-off-by: Greg Kroah-Hartman <gregkh@linuxfoundation.org>