• Filipe Manana's avatar
    Btrfs: fix missing error return if writeback for extent buffer never started · 0607eb1d
    Filipe Manana authored
    
    
    If lock_extent_buffer_for_io() fails, it returns a negative value, but its
    caller btree_write_cache_pages() ignores such error. This means that a
    call to flush_write_bio(), from lock_extent_buffer_for_io(), might have
    failed. We should make btree_write_cache_pages() notice such error values
    and stop immediatelly, making sure filemap_fdatawrite_range() returns an
    error to the transaction commit path. A failure from flush_write_bio()
    should also result in the endio callback end_bio_extent_buffer_writepage()
    being invoked, which sets the BTRFS_FS_*_ERR bits appropriately, so that
    there's no risk a transaction or log commit doesn't catch a writeback
    failure.
    
    Reviewed-by: default avatarJosef Bacik <josef@toxicpanda.com>
    Signed-off-by: default avatarFilipe Manana <fdmanana@suse.com>
    Signed-off-by: default avatarDavid Sterba <dsterba@suse.com>
    0607eb1d