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