ext4: use ext4_ext_remove_space() for fast commit replay delete range
authorXin Yin <yinxin.x@bytedance.com>
Thu, 23 Dec 2021 03:23:36 +0000 (11:23 +0800)
committerTheodore Ts'o <tytso@mit.edu>
Mon, 10 Jan 2022 18:25:54 +0000 (13:25 -0500)
commit0b5b5a62b945a141e64011b2f90ee7e46f14be98
treec835a07fc401c4c44530cb468f68900194914f98
parent5e4d0eba1ccaf19f93222abdeda5a368be141785
ext4: use ext4_ext_remove_space() for fast commit replay delete range

For now ,we use ext4_punch_hole() during fast commit replay delete range
procedure. But it will be affected by inode->i_size, which may not
correct during fast commit replay procedure. The following test will
failed.

-create & write foo (len 1000K)
-falloc FALLOC_FL_ZERO_RANGE foo (range 400K - 600K)
-create & fsync bar
-falloc FALLOC_FL_PUNCH_HOLE foo (range 300K-500K)
-fsync foo
-crash before a full commit

After the fast_commit reply procedure, the range 400K-500K will not be
removed. Because in this case, when calling ext4_punch_hole() the
inode->i_size is 0, and it just retruns with doing nothing.

Change to use ext4_ext_remove_space() instead of ext4_punch_hole()
to remove blocks of inode directly.

Signed-off-by: Xin Yin <yinxin.x@bytedance.com>
Reviewed-by: Harshad Shirwadkar <harshadshirwadkar@gmail.com>
Link: https://lore.kernel.org/r/20211223032337.5198-2-yinxin.x@bytedance.com
Signed-off-by: Theodore Ts'o <tytso@mit.edu>
Cc: stable@kernel.org
fs/ext4/fast_commit.c