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btrfs: handle failure of add_pending_csums 

add_pending_csums was added as part of the new data=ordered
implementation in e6dcd2dc9c ("Btrfs: New data=ordered
implementation"). Even back then it called the btrfs_csum_file_blocks
which can fail but it never bothered handling the failure. In ENOMEM
situation this could lead to the filesystem failing to write the
checksums for a particular extent and not detect this. On read this
could lead to the filesystem erroring out due to crc mismatch. Fix it by
propagating failure from add_pending_csums and handling them.

Signed-off-by: Nikolay Borisov <nborisov@suse.com>
Reviewed-by: Josef Bacik <jbacik@fb.com>
Reviewed-by: David Sterba <dsterba@suse.com>
Signed-off-by: David Sterba <dsterba@suse.com>
This commit is contained in:
Nikolay Borisov 2018-01-08 10:59:43 +02:00 committed by David Sterba
parent a8fd1f7174
commit ac01f26a27
1 changed files with 9 additions and 2 deletions
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11
fs/btrfs/inode.c
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@ -2042,12 +2042,15 @@ static noinline int add_pending_csums(struct btrfs_trans_handle *trans,
struct inode *inode, struct list_head *list)
{
struct btrfs_ordered_sum *sum;
int ret;
list_for_each_entry(sum, list, list) {
trans->adding_csums = true;
btrfs_csum_file_blocks(trans,
ret = btrfs_csum_file_blocks(trans,
BTRFS_I(inode)->root->fs_info->csum_root, sum);
trans->adding_csums = false;
if (ret)
return ret;
}
return 0;
}
@ -3061,7 +3064,11 @@ static int btrfs_finish_ordered_io(struct btrfs_ordered_extent *ordered_extent)
goto out;
}
add_pending_csums(trans, inode, &ordered_extent->list);
ret = add_pending_csums(trans, inode, &ordered_extent->list);
if (ret) {
btrfs_abort_transaction(trans, ret);
goto out;
}
btrfs_ordered_update_i_size(inode, 0, ordered_extent);
ret = btrfs_update_inode_fallback(trans, root, inode);