On Tue, May 22, 2012 at 12:53:47PM +0200, Stefan Behrens wrote:
> */
> clear_buffer_uptodate(bh);
> + btrfs_device_stat_inc(&device->cnt_write_io_errs);
> + device->device_stats_dirty = 1;
> + btrfs_device_stat_print_on_error(device);
this sequence repeats several times (with a slight change), IMHO it asks
for a helper.
void stat_inc(... *device, atomic_inc *cnt) {
atomic_inc(cntr);
device->device_stats_dirty = 1;
btrfs_device_stat_print_on_error(device);
}
usage:
stat_inc(device, &device->cnt_write_io_errs);
I think it's unavoidable to leave out the 'device' parameter without a
macro trickery, but as there are only 2 params, it don't it's needed.
> static void btrfs_end_bio(struct bio *bio, int err)
> {
> - struct btrfs_bio *bbio = bio->bi_private;
> + struct btrfs_bio *bbio = (struct btrfs_bio *)
> + (((uintptr_t)bio->bi_private) & ~((uintptr_t)3));
I suggest do use a helper for all the "var & 3" places, and comment why
is it so and what are the limitations. I can see from the code below
that it encodes number of devices and fails for > 3.
> int is_orig_bio = 0;
>
> - if (err)
> + if (err) {
> atomic_inc(&bbio->error);
> + if (err == -EIO || err == -EREMOTEIO) {
> + unsigned int dev_nr = ((uintptr_t)bio->bi_private) & 3;
eg.
unsigned int dev_nr = bio_private_to_nr_dev(bio);
> @@ -4148,7 +4166,9 @@ int btrfs_map_bio(struct btrfs_root *root, int rw,
> struct bio *bio,
> } else {
> bio = first_bio;
> }
> - bio->bi_private = bbio;
> + BUG_ON((((uintptr_t)bbio) & 3) != 0);
> + BUG_ON(dev_nr > 3);
> + bio->bi_private = (void *)(((uintptr_t)bbio) | dev_nr);
> bio->bi_end_io = btrfs_end_bio;
> bio->bi_sector = bbio->stripes[dev_nr].physical >> 9;
> dev = bbio->stripes[dev_nr].dev;
otherwise ok,
david
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