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drbd: separate out __al_write_transaction helper function
To be able to "force out" an activity log transaction, even if there are no pending updates. This will be used to relocate the on-disk activity log, if the on-disk offsets have to be changed, without the need to empty the activity log first. While at it, move the definition, so we can drop the forward declaration of a static helper. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com> Signed-off-by: Jens Axboe <axboe@fb.com>
This commit is contained in:
Lars Ellenberg
Jens Axboe
parent
7dbb4386b9
commit
603ee2c8c7
@ -288,7 +288,162 @@ bool drbd_al_begin_io_prepare(struct drbd_device *device, struct drbd_interval *
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return need_transaction;
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}
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static int al_write_transaction(struct drbd_device *device);
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#if (PAGE_SHIFT + 3) < (AL_EXTENT_SHIFT - BM_BLOCK_SHIFT)
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/* Currently BM_BLOCK_SHIFT, BM_EXT_SHIFT and AL_EXTENT_SHIFT
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* are still coupled, or assume too much about their relation.
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* Code below will not work if this is violated.
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* Will be cleaned up with some followup patch.
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*/
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# error FIXME
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#endif
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static unsigned int al_extent_to_bm_page(unsigned int al_enr)
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{
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return al_enr >>
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/* bit to page */
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((PAGE_SHIFT + 3) -
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/* al extent number to bit */
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(AL_EXTENT_SHIFT - BM_BLOCK_SHIFT));
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}
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static sector_t al_tr_number_to_on_disk_sector(struct drbd_device *device)
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{
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const unsigned int stripes = device->ldev->md.al_stripes;
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const unsigned int stripe_size_4kB = device->ldev->md.al_stripe_size_4k;
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/* transaction number, modulo on-disk ring buffer wrap around */
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unsigned int t = device->al_tr_number % (device->ldev->md.al_size_4k);
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/* ... to aligned 4k on disk block */
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t = ((t % stripes) * stripe_size_4kB) + t/stripes;
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/* ... to 512 byte sector in activity log */
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t *= 8;
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/* ... plus offset to the on disk position */
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return device->ldev->md.md_offset + device->ldev->md.al_offset + t;
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}
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static int __al_write_transaction(struct drbd_device *device, struct al_transaction_on_disk *buffer)
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{
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struct lc_element *e;
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sector_t sector;
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int i, mx;
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unsigned extent_nr;
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unsigned crc = 0;
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int err = 0;
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memset(buffer, 0, sizeof(*buffer));
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buffer->magic = cpu_to_be32(DRBD_AL_MAGIC);
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buffer->tr_number = cpu_to_be32(device->al_tr_number);
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i = 0;
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/* Even though no one can start to change this list
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* once we set the LC_LOCKED -- from drbd_al_begin_io(),
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* lc_try_lock_for_transaction() --, someone may still
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* be in the process of changing it. */
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spin_lock_irq(&device->al_lock);
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list_for_each_entry(e, &device->act_log->to_be_changed, list) {
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if (i == AL_UPDATES_PER_TRANSACTION) {
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i++;
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break;
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}
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buffer->update_slot_nr[i] = cpu_to_be16(e->lc_index);
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buffer->update_extent_nr[i] = cpu_to_be32(e->lc_new_number);
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if (e->lc_number != LC_FREE)
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drbd_bm_mark_for_writeout(device,
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al_extent_to_bm_page(e->lc_number));
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i++;
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}
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spin_unlock_irq(&device->al_lock);
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BUG_ON(i > AL_UPDATES_PER_TRANSACTION);
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buffer->n_updates = cpu_to_be16(i);
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for ( ; i < AL_UPDATES_PER_TRANSACTION; i++) {
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buffer->update_slot_nr[i] = cpu_to_be16(-1);
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buffer->update_extent_nr[i] = cpu_to_be32(LC_FREE);
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}
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buffer->context_size = cpu_to_be16(device->act_log->nr_elements);
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buffer->context_start_slot_nr = cpu_to_be16(device->al_tr_cycle);
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mx = min_t(int, AL_CONTEXT_PER_TRANSACTION,
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device->act_log->nr_elements - device->al_tr_cycle);
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for (i = 0; i < mx; i++) {
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unsigned idx = device->al_tr_cycle + i;
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extent_nr = lc_element_by_index(device->act_log, idx)->lc_number;
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buffer->context[i] = cpu_to_be32(extent_nr);
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}
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for (; i < AL_CONTEXT_PER_TRANSACTION; i++)
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buffer->context[i] = cpu_to_be32(LC_FREE);
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device->al_tr_cycle += AL_CONTEXT_PER_TRANSACTION;
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if (device->al_tr_cycle >= device->act_log->nr_elements)
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device->al_tr_cycle = 0;
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sector = al_tr_number_to_on_disk_sector(device);
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crc = crc32c(0, buffer, 4096);
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buffer->crc32c = cpu_to_be32(crc);
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if (drbd_bm_write_hinted(device))
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err = -EIO;
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else {
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bool write_al_updates;
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rcu_read_lock();
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write_al_updates = rcu_dereference(device->ldev->disk_conf)->al_updates;
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rcu_read_unlock();
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if (write_al_updates) {
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if (drbd_md_sync_page_io(device, device->ldev, sector, WRITE)) {
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err = -EIO;
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drbd_chk_io_error(device, 1, DRBD_META_IO_ERROR);
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} else {
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device->al_tr_number++;
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device->al_writ_cnt++;
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}
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}
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}
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return err;
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}
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static int al_write_transaction(struct drbd_device *device)
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{
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struct al_transaction_on_disk *buffer;
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int err;
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if (!get_ldev(device)) {
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drbd_err(device, "disk is %s, cannot start al transaction\n",
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drbd_disk_str(device->state.disk));
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return -EIO;
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}
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/* The bitmap write may have failed, causing a state change. */
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if (device->state.disk < D_INCONSISTENT) {
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drbd_err(device,
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"disk is %s, cannot write al transaction\n",
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drbd_disk_str(device->state.disk));
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put_ldev(device);
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return -EIO;
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}
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/* protects md_io_buffer, al_tr_cycle, ... */
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buffer = drbd_md_get_buffer(device, __func__);
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if (!buffer) {
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drbd_err(device, "disk failed while waiting for md_io buffer\n");
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put_ldev(device);
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return -ENODEV;
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}
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err = __al_write_transaction(device, buffer);
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drbd_md_put_buffer(device);
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put_ldev(device);
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return err;
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}
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void drbd_al_begin_io_commit(struct drbd_device *device)
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{
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@ -420,153 +575,6 @@ void drbd_al_complete_io(struct drbd_device *device, struct drbd_interval *i)
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wake_up(&device->al_wait);
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}
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#if (PAGE_SHIFT + 3) < (AL_EXTENT_SHIFT - BM_BLOCK_SHIFT)
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/* Currently BM_BLOCK_SHIFT, BM_EXT_SHIFT and AL_EXTENT_SHIFT
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* are still coupled, or assume too much about their relation.
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* Code below will not work if this is violated.
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* Will be cleaned up with some followup patch.
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*/
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# error FIXME
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#endif
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static unsigned int al_extent_to_bm_page(unsigned int al_enr)
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{
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return al_enr >>
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/* bit to page */
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((PAGE_SHIFT + 3) -
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/* al extent number to bit */
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(AL_EXTENT_SHIFT - BM_BLOCK_SHIFT));
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}
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static sector_t al_tr_number_to_on_disk_sector(struct drbd_device *device)
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{
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const unsigned int stripes = device->ldev->md.al_stripes;
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const unsigned int stripe_size_4kB = device->ldev->md.al_stripe_size_4k;
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/* transaction number, modulo on-disk ring buffer wrap around */
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unsigned int t = device->al_tr_number % (device->ldev->md.al_size_4k);
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/* ... to aligned 4k on disk block */
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t = ((t % stripes) * stripe_size_4kB) + t/stripes;
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/* ... to 512 byte sector in activity log */
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t *= 8;
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/* ... plus offset to the on disk position */
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return device->ldev->md.md_offset + device->ldev->md.al_offset + t;
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}
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int al_write_transaction(struct drbd_device *device)
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{
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struct al_transaction_on_disk *buffer;
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struct lc_element *e;
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sector_t sector;
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int i, mx;
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unsigned extent_nr;
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unsigned crc = 0;
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int err = 0;
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if (!get_ldev(device)) {
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drbd_err(device, "disk is %s, cannot start al transaction\n",
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drbd_disk_str(device->state.disk));
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return -EIO;
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}
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/* The bitmap write may have failed, causing a state change. */
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if (device->state.disk < D_INCONSISTENT) {
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drbd_err(device,
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"disk is %s, cannot write al transaction\n",
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drbd_disk_str(device->state.disk));
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put_ldev(device);
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return -EIO;
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}
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/* protects md_io_buffer, al_tr_cycle, ... */
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buffer = drbd_md_get_buffer(device, __func__);
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if (!buffer) {
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drbd_err(device, "disk failed while waiting for md_io buffer\n");
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put_ldev(device);
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return -ENODEV;
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}
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memset(buffer, 0, sizeof(*buffer));
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buffer->magic = cpu_to_be32(DRBD_AL_MAGIC);
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buffer->tr_number = cpu_to_be32(device->al_tr_number);
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i = 0;
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/* Even though no one can start to change this list
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* once we set the LC_LOCKED -- from drbd_al_begin_io(),
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* lc_try_lock_for_transaction() --, someone may still
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* be in the process of changing it. */
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spin_lock_irq(&device->al_lock);
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list_for_each_entry(e, &device->act_log->to_be_changed, list) {
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if (i == AL_UPDATES_PER_TRANSACTION) {
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i++;
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break;
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}
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buffer->update_slot_nr[i] = cpu_to_be16(e->lc_index);
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buffer->update_extent_nr[i] = cpu_to_be32(e->lc_new_number);
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if (e->lc_number != LC_FREE)
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drbd_bm_mark_for_writeout(device,
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al_extent_to_bm_page(e->lc_number));
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i++;
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}
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spin_unlock_irq(&device->al_lock);
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BUG_ON(i > AL_UPDATES_PER_TRANSACTION);
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buffer->n_updates = cpu_to_be16(i);
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for ( ; i < AL_UPDATES_PER_TRANSACTION; i++) {
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buffer->update_slot_nr[i] = cpu_to_be16(-1);
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buffer->update_extent_nr[i] = cpu_to_be32(LC_FREE);
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}
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buffer->context_size = cpu_to_be16(device->act_log->nr_elements);
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buffer->context_start_slot_nr = cpu_to_be16(device->al_tr_cycle);
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mx = min_t(int, AL_CONTEXT_PER_TRANSACTION,
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device->act_log->nr_elements - device->al_tr_cycle);
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for (i = 0; i < mx; i++) {
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unsigned idx = device->al_tr_cycle + i;
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extent_nr = lc_element_by_index(device->act_log, idx)->lc_number;
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buffer->context[i] = cpu_to_be32(extent_nr);
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}
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for (; i < AL_CONTEXT_PER_TRANSACTION; i++)
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buffer->context[i] = cpu_to_be32(LC_FREE);
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device->al_tr_cycle += AL_CONTEXT_PER_TRANSACTION;
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if (device->al_tr_cycle >= device->act_log->nr_elements)
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device->al_tr_cycle = 0;
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sector = al_tr_number_to_on_disk_sector(device);
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crc = crc32c(0, buffer, 4096);
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buffer->crc32c = cpu_to_be32(crc);
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if (drbd_bm_write_hinted(device))
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err = -EIO;
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else {
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bool write_al_updates;
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rcu_read_lock();
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write_al_updates = rcu_dereference(device->ldev->disk_conf)->al_updates;
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rcu_read_unlock();
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if (write_al_updates) {
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if (drbd_md_sync_page_io(device, device->ldev, sector, WRITE)) {
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err = -EIO;
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drbd_chk_io_error(device, 1, DRBD_META_IO_ERROR);
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} else {
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device->al_tr_number++;
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device->al_writ_cnt++;
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}
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}
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}
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drbd_md_put_buffer(device);
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put_ldev(device);
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return err;
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}
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static int _try_lc_del(struct drbd_device *device, struct lc_element *al_ext)
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{
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int rv;
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