5.4-stable review patch. If anyone has any objections, please let me know.
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From: zhanchengbin zhanchengbin1@huawei.com
commit 3f5424790d4377839093b68c12b130077a4e4510 upstream.
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 Cc: Baokun Li libaokun1@huawei.com Signed-off-by: Greg Kroah-Hartman gregkh@linuxfoundation.org --- fs/ext4/extents.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)
--- a/fs/ext4/extents.c +++ b/fs/ext4/extents.c @@ -3421,7 +3421,7 @@ static int ext4_split_extent_at(handle_t ext4_ext_mark_unwritten(ex2);
err = ext4_ext_insert_extent(handle, inode, ppath, &newex, flags); - if (err != -ENOSPC && err != -EDQUOT) + if (err != -ENOSPC && err != -EDQUOT && err != -ENOMEM) goto out;
if (EXT4_EXT_MAY_ZEROOUT & split_flag) {