Commit 3f542479 authored by zhanchengbin's avatar zhanchengbin Committed by Theodore Ts'o

ext4: fix inode tree inconsistency caused by ENOMEM

If ENOMEM fails when the extent is splitting, we need to restore the length
of the split extent.
In the ext4_split_extent_at function, only in ext4_ext_create_new_leaf will
it alloc memory and change the shape of the extent tree,even if an ENOMEM
is returned at this time, the extent tree is still self-consistent, Just
restore the split extent lens in the function ext4_split_extent_at.

ext4_split_extent_at
 ext4_ext_insert_extent
  ext4_ext_create_new_leaf
   1)ext4_ext_split
     ext4_find_extent
   2)ext4_ext_grow_indepth
     ext4_find_extent
Signed-off-by: default avatarzhanchengbin <zhanchengbin1@huawei.com>
Reviewed-by: default avatarJan Kara <jack@suse.cz>
Link: https://lore.kernel.org/r/20230103022812.130603-1-zhanchengbin1@huawei.comSigned-off-by: default avatarTheodore Ts'o <tytso@mit.edu>
parent f31173c1
...@@ -3251,7 +3251,7 @@ static int ext4_split_extent_at(handle_t *handle, ...@@ -3251,7 +3251,7 @@ static int ext4_split_extent_at(handle_t *handle,
ext4_ext_mark_unwritten(ex2); ext4_ext_mark_unwritten(ex2);
err = ext4_ext_insert_extent(handle, inode, ppath, &newex, flags); err = ext4_ext_insert_extent(handle, inode, ppath, &newex, flags);
if (err != -ENOSPC && err != -EDQUOT) if (err != -ENOSPC && err != -EDQUOT && err != -ENOMEM)
goto out; goto out;
if (EXT4_EXT_MAY_ZEROOUT & split_flag) { if (EXT4_EXT_MAY_ZEROOUT & split_flag) {
......
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