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drbd: detach from frozen backing device

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* drbd-8.3:
  documentation: Documented detach's --force and disk's --disk-timeout
  drbd: Implemented the disk-timeout option
  drbd: Force flag for the detach operation
  drbd: Allow new IOs while the local disk in in FAILED state
  drbd: Bitmap IO functions can not return prematurely if the disk breaks
  drbd: Added a kref to bm_aio_ctx
  drbd: Hold a reference to ldev while doing meta-data IO
  drbd: Keep a reference to the bio until the completion handler finished
  drbd: Implemented wait_until_done_or_disk_failure()
  drbd: Replaced md_io_mutex by an atomic: md_io_in_use
  drbd: moved md_io into mdev
  drbd: Immediately allow completion of IOs, that wait for IO completions on a failed disk
  drbd: Keep a reference to barrier acked requests

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
This commit is contained in:
Philipp Reisner 2011-07-05 15:38:59 +02:00
parent 2fcb8f307f
commit cdfda633d2
12 changed files with 322 additions and 91 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

75
drivers/block/drbd/drbd_actlog.c
View file

@ -114,18 +114,44 @@ struct drbd_atodb_wait {
static int w_al_write_transaction(struct drbd_work *, int);
void *drbd_md_get_buffer(struct drbd_conf *mdev)
{
int r;
wait_event(mdev->misc_wait,
(r = atomic_cmpxchg(&mdev->md_io_in_use, 0, 1)) == 0 ||
mdev->state.disk <= D_FAILED);
return r ? NULL : page_address(mdev->md_io_page);
}
void drbd_md_put_buffer(struct drbd_conf *mdev)
{
if (atomic_dec_and_test(&mdev->md_io_in_use))
wake_up(&mdev->misc_wait);
}
static bool md_io_allowed(struct drbd_conf *mdev)
{
enum drbd_disk_state ds = mdev->state.disk;
return ds >= D_NEGOTIATING || ds == D_ATTACHING;
}
void wait_until_done_or_disk_failure(struct drbd_conf *mdev, unsigned int *done)
{
wait_event(mdev->misc_wait, *done || !md_io_allowed(mdev));
}
static int _drbd_md_sync_page_io(struct drbd_conf *mdev,
struct drbd_backing_dev *bdev,
struct page *page, sector_t sector,
int rw, int size)
{
struct bio *bio;
struct drbd_md_io md_io;
int err;
md_io.mdev = mdev;
init_completion(&md_io.event);
md_io.error = 0;
mdev->md_io.done = 0;
mdev->md_io.error = -ENODEV;
if ((rw & WRITE) && !test_bit(MD_NO_FUA, &mdev->flags))
rw |= REQ_FUA | REQ_FLUSH;
@ -137,17 +163,25 @@ static int _drbd_md_sync_page_io(struct drbd_conf *mdev,
err = -EIO;
if (bio_add_page(bio, page, size, 0) != size)
goto out;
bio->bi_private = &md_io;
bio->bi_private = &mdev->md_io;
bio->bi_end_io = drbd_md_io_complete;
bio->bi_rw = rw;
if (!get_ldev_if_state(mdev, D_ATTACHING)) { /* Corresponding put_ldev in drbd_md_io_complete() */
dev_err(DEV, "ASSERT FAILED: get_ldev_if_state() == 1 in _drbd_md_sync_page_io()\n");
err = -ENODEV;
goto out;
}
bio_get(bio); /* one bio_put() is in the completion handler */
atomic_inc(&mdev->md_io_in_use); /* drbd_md_put_buffer() is in the completion handler */
if (drbd_insert_fault(mdev, (rw & WRITE) ? DRBD_FAULT_MD_WR : DRBD_FAULT_MD_RD))
bio_endio(bio, -EIO);
else
submit_bio(rw, bio);
wait_for_completion(&md_io.event);
wait_until_done_or_disk_failure(mdev, &mdev->md_io.done);
if (bio_flagged(bio, BIO_UPTODATE))
err = md_io.error;
err = mdev->md_io.error;
out:
bio_put(bio);
@ -160,7 +194,7 @@ int drbd_md_sync_page_io(struct drbd_conf *mdev, struct drbd_backing_dev *bdev,
int err;
struct page *iop = mdev->md_io_page;
D_ASSERT(mutex_is_locked(&mdev->md_io_mutex));
D_ASSERT(atomic_read(&mdev->md_io_in_use) == 1);
BUG_ON(!bdev->md_bdev);
@ -344,8 +378,14 @@ w_al_write_transaction(struct drbd_work *w, int unused)
return 0;
}
mutex_lock(&mdev->md_io_mutex); /* protects md_io_buffer, al_tr_cycle, ... */
buffer = page_address(mdev->md_io_page);
buffer = drbd_md_get_buffer(mdev); /* protects md_io_buffer, al_tr_cycle, ... */
if (!buffer) {
dev_err(DEV, "disk failed while waiting for md_io buffer\n");
aw->err = -EIO;
complete(&((struct update_al_work *)w)->event);
put_ldev(mdev);
return 1;
}
memset(buffer, 0, sizeof(*buffer));
buffer->magic = cpu_to_be32(DRBD_AL_MAGIC);
@ -415,7 +455,7 @@ w_al_write_transaction(struct drbd_work *w, int unused)
mdev->al_tr_number++;
}
mutex_unlock(&mdev->md_io_mutex);
drbd_md_put_buffer(mdev);
complete(&((struct update_al_work *)w)->event);
put_ldev(mdev);
@ -506,8 +546,9 @@ int drbd_al_read_log(struct drbd_conf *mdev, struct drbd_backing_dev *bdev)
/* lock out all other meta data io for now,
* and make sure the page is mapped.
*/
mutex_lock(&mdev->md_io_mutex);
b = page_address(mdev->md_io_page);
b = drbd_md_get_buffer(mdev);
if (!b)
return 0;
/* Always use the full ringbuffer space for now.
* possible optimization: read in all of it,
@ -528,7 +569,7 @@ int drbd_al_read_log(struct drbd_conf *mdev, struct drbd_backing_dev *bdev)
/* IO error */
if (rv == -1) {
mutex_unlock(&mdev->md_io_mutex);
drbd_md_put_buffer(mdev);
return 0;
}
@ -558,7 +599,7 @@ int drbd_al_read_log(struct drbd_conf *mdev, struct drbd_backing_dev *bdev)
if (!found_valid) {
if (found_initialized != mx)
dev_warn(DEV, "No usable activity log found.\n");
mutex_unlock(&mdev->md_io_mutex);
drbd_md_put_buffer(mdev);
return 1;
}
@ -573,7 +614,7 @@ int drbd_al_read_log(struct drbd_conf *mdev, struct drbd_backing_dev *bdev)
if (!expect(rv != 0))
goto cancel;
if (rv == -1) {
mutex_unlock(&mdev->md_io_mutex);
drbd_md_put_buffer(mdev);
return 0;
}
@ -643,7 +684,7 @@ cancel:
mdev->al_tr_pos = (to + 1) % (MD_AL_SECTORS*512/MD_BLOCK_SIZE);
/* ok, we are done with it */
mutex_unlock(&mdev->md_io_mutex);
drbd_md_put_buffer(mdev);
dev_info(DEV, "Found %d transactions (%d active extents) in activity log.\n",
transactions, active_extents);

117
drivers/block/drbd/drbd_bitmap.c
View file

@ -918,13 +918,22 @@ void drbd_bm_clear_all(struct drbd_conf *mdev)
struct bm_aio_ctx {
struct drbd_conf *mdev;
atomic_t in_flight;
struct completion done;
unsigned int done;
unsigned flags;
#define BM_AIO_COPY_PAGES 1
#define BM_AIO_WRITE_HINTED 2
int error;
struct kref kref;
};
static void bm_aio_ctx_destroy(struct kref *kref)
{
struct bm_aio_ctx *ctx = container_of(kref, struct bm_aio_ctx, kref);
put_ldev(ctx->mdev);
kfree(ctx);
}
/* bv_page may be a copy, or may be the original */
static void bm_async_io_complete(struct bio *bio, int error)
{
@ -968,13 +977,16 @@ static void bm_async_io_complete(struct bio *bio, int error)
bio_put(bio);
if (atomic_dec_and_test(&ctx->in_flight))
complete(&ctx->done);
if (atomic_dec_and_test(&ctx->in_flight)) {
ctx->done = 1;
wake_up(&mdev->misc_wait);
kref_put(&ctx->kref, &bm_aio_ctx_destroy);
}
}
static void bm_page_io_async(struct bm_aio_ctx *ctx, int page_nr, int rw) __must_hold(local)
{
struct bio *bio = bio_alloc_drbd(GFP_KERNEL);
struct bio *bio = bio_alloc_drbd(GFP_NOIO);
struct drbd_conf *mdev = ctx->mdev;
struct drbd_bitmap *b = mdev->bitmap;
struct page *page;
@ -1032,12 +1044,7 @@ static void bm_page_io_async(struct bm_aio_ctx *ctx, int page_nr, int rw) __must
*/
static int bm_rw(struct drbd_conf *mdev, int rw, unsigned flags, unsigned lazy_writeout_upper_idx) __must_hold(local)
{
struct bm_aio_ctx ctx = {
.mdev = mdev,
.in_flight = ATOMIC_INIT(1),
.done = COMPLETION_INITIALIZER_ONSTACK(ctx.done),
.flags = flags,
};
struct bm_aio_ctx *ctx;
struct drbd_bitmap *b = mdev->bitmap;
int num_pages, i, count = 0;
unsigned long now;
@ -1052,7 +1059,27 @@ static int bm_rw(struct drbd_conf *mdev, int rw, unsigned flags, unsigned lazy_w
* For lazy writeout, we don't care for ongoing changes to the bitmap,
* as we submit copies of pages anyways.
*/
if (!ctx.flags)
ctx = kmalloc(sizeof(struct bm_aio_ctx), GFP_NOIO);
if (!ctx)
return -ENOMEM;
*ctx = (struct bm_aio_ctx) {
.mdev = mdev,
.in_flight = ATOMIC_INIT(1),
.done = 0,
.flags = flags,
.error = 0,
.kref = { ATOMIC_INIT(2) },
};
if (!get_ldev_if_state(mdev, D_ATTACHING)) { /* put is in bm_aio_ctx_destroy() */
dev_err(DEV, "ASSERT FAILED: get_ldev_if_state() == 1 in bm_rw()\n");
err = -ENODEV;
goto out;
}
if (!ctx->flags)
WARN_ON(!(BM_LOCKED_MASK & b->bm_flags));
num_pages = b->bm_number_of_pages;
@ -1081,32 +1108,40 @@ static int bm_rw(struct drbd_conf *mdev, int rw, unsigned flags, unsigned lazy_w
continue;
}
}
atomic_inc(&ctx.in_flight);
bm_page_io_async(&ctx, i, rw);
atomic_inc(&ctx->in_flight);
bm_page_io_async(ctx, i, rw);
++count;
cond_resched();
}
/*
* We initialize ctx.in_flight to one to make sure bm_async_io_complete
* will not complete() early, and decrement / test it here. If there
* We initialize ctx->in_flight to one to make sure bm_async_io_complete
* will not set ctx->done early, and decrement / test it here. If there
* are still some bios in flight, we need to wait for them here.
* If all IO is done already (or nothing had been submitted), there is
* no need to wait. Still, we need to put the kref associated with the
* "in_flight reached zero, all done" event.
*/
if (!atomic_dec_and_test(&ctx.in_flight))
wait_for_completion(&ctx.done);
if (!atomic_dec_and_test(&ctx->in_flight))
wait_until_done_or_disk_failure(mdev, &ctx->done);
else
kref_put(&ctx->kref, &bm_aio_ctx_destroy);
/* summary for global bitmap IO */
if (flags == 0)
dev_info(DEV, "bitmap %s of %u pages took %lu jiffies\n",
rw == WRITE ? "WRITE" : "READ",
count, jiffies - now);
rw == WRITE ? "WRITE" : "READ",
count, jiffies - now);
if (ctx.error) {
if (ctx->error) {
dev_alert(DEV, "we had at least one MD IO ERROR during bitmap IO\n");
drbd_chk_io_error(mdev, 1, true);
err = -EIO; /* ctx.error ? */
err = -EIO; /* ctx->error ? */
}
if (atomic_read(&ctx->in_flight))
err = -EIO; /* Disk failed during IO... */
now = jiffies;
if (rw == WRITE) {
drbd_md_flush(mdev);
@ -1121,6 +1156,8 @@ static int bm_rw(struct drbd_conf *mdev, int rw, unsigned flags, unsigned lazy_w
dev_info(DEV, "%s (%lu bits) marked out-of-sync by on disk bit-map.\n",
ppsize(ppb, now << (BM_BLOCK_SHIFT-10)), now);
out:
kref_put(&ctx->kref, &bm_aio_ctx_destroy);
return err;
}
@ -1177,28 +1214,46 @@ int drbd_bm_write_hinted(struct drbd_conf *mdev) __must_hold(local)
*/
int drbd_bm_write_page(struct drbd_conf *mdev, unsigned int idx) __must_hold(local)
{
struct bm_aio_ctx ctx = {
.mdev = mdev,
.in_flight = ATOMIC_INIT(1),
.done = COMPLETION_INITIALIZER_ONSTACK(ctx.done),
.flags = BM_AIO_COPY_PAGES,
};
struct bm_aio_ctx *ctx;
int err;
if (bm_test_page_unchanged(mdev->bitmap->bm_pages[idx])) {
dynamic_dev_dbg(DEV, "skipped bm page write for idx %u\n", idx);
return 0;
}
bm_page_io_async(&ctx, idx, WRITE_SYNC);
wait_for_completion(&ctx.done);
ctx = kmalloc(sizeof(struct bm_aio_ctx), GFP_NOIO);
if (!ctx)
return -ENOMEM;
if (ctx.error)
*ctx = (struct bm_aio_ctx) {
.mdev = mdev,
.in_flight = ATOMIC_INIT(1),
.done = 0,
.flags = BM_AIO_COPY_PAGES,
.error = 0,
.kref = { ATOMIC_INIT(2) },
};
if (!get_ldev_if_state(mdev, D_ATTACHING)) { /* put is in bm_aio_ctx_destroy() */
dev_err(DEV, "ASSERT FAILED: get_ldev_if_state() == 1 in drbd_bm_write_page()\n");
err = -ENODEV;
goto out;
}
bm_page_io_async(ctx, idx, WRITE_SYNC);
wait_until_done_or_disk_failure(mdev, &ctx->done);
if (ctx->error)
drbd_chk_io_error(mdev, 1, true);
/* that should force detach, so the in memory bitmap will be
* gone in a moment as well. */
mdev->bm_writ_cnt++;
return ctx.error;
err = atomic_read(&ctx->in_flight) ? -EIO : ctx->error;
out:
kref_put(&ctx->kref, &bm_aio_ctx_destroy);
return err;
}
/* NOTE

12
drivers/block/drbd/drbd_int.h
View file

@ -780,8 +780,7 @@ struct drbd_backing_dev {
};
struct drbd_md_io {
struct drbd_conf *mdev;
struct completion event;
unsigned int done;
int error;
};
@ -852,6 +851,7 @@ struct drbd_tconn { /* is a resource from the config file */
struct drbd_tl_epoch *newest_tle;
struct drbd_tl_epoch *oldest_tle;
struct list_head out_of_sequence_requests;
struct list_head barrier_acked_requests;
struct crypto_hash *cram_hmac_tfm;
struct crypto_hash *integrity_tfm; /* checksums we compute, updates protected by tconn->data->mutex */
@ -978,7 +978,8 @@ struct drbd_conf {
atomic_t pp_in_use_by_net; /* sendpage()d, still referenced by tcp */
wait_queue_head_t ee_wait;
struct page *md_io_page; /* one page buffer for md_io */
struct mutex md_io_mutex; /* protects the md_io_buffer */
struct drbd_md_io md_io;
atomic_t md_io_in_use; /* protects the md_io, md_io_page and md_io_tmpp */
spinlock_t al_lock;
wait_queue_head_t al_wait;
struct lru_cache *act_log; /* activity log */
@ -1424,9 +1425,12 @@ extern void resume_next_sg(struct drbd_conf *mdev);
extern void suspend_other_sg(struct drbd_conf *mdev);
extern int drbd_resync_finished(struct drbd_conf *mdev);
/* maybe rather drbd_main.c ? */
extern void *drbd_md_get_buffer(struct drbd_conf *mdev);
extern void drbd_md_put_buffer(struct drbd_conf *mdev);
extern int drbd_md_sync_page_io(struct drbd_conf *mdev,
struct drbd_backing_dev *bdev, sector_t sector, int rw);
extern void drbd_ov_out_of_sync_found(struct drbd_conf *, sector_t, int);
extern void wait_until_done_or_disk_failure(struct drbd_conf *mdev, unsigned int *done);
extern void drbd_rs_controller_reset(struct drbd_conf *mdev);
static inline void ov_out_of_sync_print(struct drbd_conf *mdev)
@ -2151,12 +2155,12 @@ static inline int drbd_state_is_stable(struct drbd_conf *mdev)
case D_OUTDATED:
case D_CONSISTENT:
case D_UP_TO_DATE:
case D_FAILED:
/* disk state is stable as well. */
break;
/* no new io accepted during transitional states */
case D_ATTACHING:
case D_FAILED:
case D_NEGOTIATING:
case D_UNKNOWN:
case D_MASK:

77
drivers/block/drbd/drbd_main.c
View file

@ -215,6 +215,7 @@ static int tl_init(struct drbd_tconn *tconn)
tconn->oldest_tle = b;
tconn->newest_tle = b;
INIT_LIST_HEAD(&tconn->out_of_sequence_requests);
INIT_LIST_HEAD(&tconn->barrier_acked_requests);
return 1;
}
@ -315,7 +316,7 @@ void tl_release(struct drbd_tconn *tconn, unsigned int barrier_nr,
These have been list_move'd to the out_of_sequence_requests list in
_req_mod(, BARRIER_ACKED) above.
*/
list_del_init(&b->requests);
list_splice_init(&b->requests, &tconn->barrier_acked_requests);
mdev = b->w.mdev;
nob = b->next;
@ -417,8 +418,23 @@ void _tl_restart(struct drbd_tconn *tconn, enum drbd_req_event what)
b = tmp;
list_splice(&carry_reads, &b->requests);
}
}
/* Actions operating on the disk state, also want to work on
requests that got barrier acked. */
switch (what) {
case FAIL_FROZEN_DISK_IO:
case RESTART_FROZEN_DISK_IO:
list_for_each_safe(le, tle, &tconn->barrier_acked_requests) {
req = list_entry(le, struct drbd_request, tl_requests);
_req_mod(req, what);
}
case CONNECTION_LOST_WHILE_PENDING:
case RESEND:
break;
default:
conn_err(tconn, "what = %d in _tl_restart()\n", what);
}
}
/**
* tl_clear() - Clears all requests and &struct drbd_tl_epoch objects out of the TL
@ -467,6 +483,42 @@ void tl_restart(struct drbd_tconn *tconn, enum drbd_req_event what)
spin_unlock_irq(&tconn->req_lock);
}
/**
* tl_apply() - Applies an event to all requests for a certain mdev in the TL
* @mdev: DRBD device.
* @what: The action/event to perform with all request objects
*
* @what might ony be ABORT_DISK_IO.
*/
void tl_apply(struct drbd_conf *mdev, enum drbd_req_event what)
{
struct drbd_tconn *tconn = mdev->tconn;
struct drbd_tl_epoch *b;
struct list_head *le, *tle;
struct drbd_request *req;
D_ASSERT(what == ABORT_DISK_IO);
spin_lock_irq(&tconn->req_lock);
b = tconn->oldest_tle;
while (b) {
list_for_each_safe(le, tle, &b->requests) {
req = list_entry(le, struct drbd_request, tl_requests);
if (req->w.mdev == mdev)
_req_mod(req, what);
}
b = b->next;
}
list_for_each_safe(le, tle, &tconn->barrier_acked_requests) {
req = list_entry(le, struct drbd_request, tl_requests);
if (req->w.mdev == mdev)
_req_mod(req, what);
}
spin_unlock_irq(&tconn->req_lock);
}
static int drbd_thread_setup(void *arg)
{
struct drbd_thread *thi = (struct drbd_thread *) arg;
@ -2003,8 +2055,8 @@ void drbd_init_set_defaults(struct drbd_conf *mdev)
atomic_set(&mdev->rs_sect_in, 0);
atomic_set(&mdev->rs_sect_ev, 0);
atomic_set(&mdev->ap_in_flight, 0);
atomic_set(&mdev->md_io_in_use, 0);
mutex_init(&mdev->md_io_mutex);
mutex_init(&mdev->own_state_mutex);
mdev->state_mutex = &mdev->own_state_mutex;
@ -2282,6 +2334,8 @@ void drbd_minor_destroy(struct kref *kref)
struct drbd_conf *mdev = container_of(kref, struct drbd_conf, kref);
struct drbd_tconn *tconn = mdev->tconn;
del_timer_sync(&mdev->request_timer);
/* paranoia asserts */
D_ASSERT(mdev->open_cnt == 0);
D_ASSERT(list_empty(&mdev->tconn->data.work.q));
@ -2868,8 +2922,10 @@ void drbd_md_sync(struct drbd_conf *mdev)
if (!get_ldev_if_state(mdev, D_FAILED))
return;
mutex_lock(&mdev->md_io_mutex);
buffer = (struct meta_data_on_disk *)page_address(mdev->md_io_page);
buffer = drbd_md_get_buffer(mdev);
if (!buffer)
goto out;
memset(buffer, 0, 512);
buffer->la_size = cpu_to_be64(drbd_get_capacity(mdev->this_bdev));
@ -2900,7 +2956,8 @@ void drbd_md_sync(struct drbd_conf *mdev)
* since we updated it on metadata. */
mdev->ldev->md.la_size_sect = drbd_get_capacity(mdev->this_bdev);
mutex_unlock(&mdev->md_io_mutex);
drbd_md_put_buffer(mdev);
out:
put_ldev(mdev);
}
@ -2920,8 +2977,9 @@ int drbd_md_read(struct drbd_conf *mdev, struct drbd_backing_dev *bdev)
if (!get_ldev_if_state(mdev, D_ATTACHING))
return ERR_IO_MD_DISK;
mutex_lock(&mdev->md_io_mutex);
buffer = (struct meta_data_on_disk *)page_address(mdev->md_io_page);
buffer = drbd_md_get_buffer(mdev);
if (!buffer)
goto out;
if (drbd_md_sync_page_io(mdev, bdev, bdev->md.md_offset, READ)) {
/* NOTE: can't do normal error processing here as this is
@ -2983,7 +3041,8 @@ int drbd_md_read(struct drbd_conf *mdev, struct drbd_backing_dev *bdev)
bdev->disk_conf->al_extents = DRBD_AL_EXTENTS_DEF;
err:
mutex_unlock(&mdev->md_io_mutex);
drbd_md_put_buffer(mdev);
out:
put_ldev(mdev);
return rv;

28
drivers/block/drbd/drbd_nl.c
View file

@ -1236,6 +1236,7 @@ int drbd_adm_disk_opts(struct sk_buff *skb, struct genl_info *info)
synchronize_rcu();
kfree(old_disk_conf);
kfree(old_plan);
mod_timer(&mdev->request_timer, jiffies + HZ);
goto success;
fail_unlock:
@ -1628,6 +1629,8 @@ int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info)
if (rv < SS_SUCCESS)
goto force_diskless_dec;
mod_timer(&mdev->request_timer, jiffies + HZ);
if (mdev->state.role == R_PRIMARY)
mdev->ldev->md.uuid[UI_CURRENT] |= (u64)1;
else
@ -1667,10 +1670,17 @@ int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info)
return 0;
}
static int adm_detach(struct drbd_conf *mdev)
static int adm_detach(struct drbd_conf *mdev, int force)
{
enum drbd_state_rv retcode;
int ret;
if (force) {
drbd_force_state(mdev, NS(disk, D_FAILED));
retcode = SS_SUCCESS;
goto out;
}
drbd_suspend_io(mdev); /* so no-one is stuck in drbd_al_begin_io */
retcode = drbd_request_state(mdev, NS(disk, D_FAILED));
/* D_FAILED will transition to DISKLESS. */
@ -1681,6 +1691,7 @@ static int adm_detach(struct drbd_conf *mdev)
retcode = SS_NOTHING_TO_DO;
if (ret)
retcode = ERR_INTR;
out:
return retcode;
}
@ -1692,6 +1703,8 @@ static int adm_detach(struct drbd_conf *mdev)
int drbd_adm_detach(struct sk_buff *skb, struct genl_info *info)
{
enum drbd_ret_code retcode;
struct detach_parms parms = { };
int err;
retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
if (!adm_ctx.reply_skb)
@ -1699,7 +1712,16 @@ int drbd_adm_detach(struct sk_buff *skb, struct genl_info *info)
if (retcode != NO_ERROR)
goto out;
retcode = adm_detach(adm_ctx.mdev);
if (info->attrs[DRBD_NLA_DETACH_PARMS]) {
err = detach_parms_from_attrs(&parms, info);
if (err) {
retcode = ERR_MANDATORY_TAG;
drbd_msg_put_info(from_attrs_err_to_txt(err));
goto out;
}
}
retcode = adm_detach(adm_ctx.mdev, parms.force_detach);
out:
drbd_adm_finish(info, retcode);
return 0;
@ -3116,7 +3138,7 @@ int drbd_adm_down(struct sk_buff *skb, struct genl_info *info)
/* detach */
idr_for_each_entry(&adm_ctx.tconn->volumes, mdev, i) {
retcode = adm_detach(mdev);
retcode = adm_detach(mdev, 0);
if (retcode < SS_SUCCESS) {
drbd_msg_put_info("failed to detach");
goto out;

2
drivers/block/drbd/drbd_receiver.c
View file

@ -4366,8 +4366,6 @@ static int drbd_disconnected(struct drbd_conf *mdev)
atomic_set(&mdev->rs_pending_cnt, 0);
wake_up(&mdev->misc_wait);
del_timer(&mdev->request_timer);
del_timer_sync(&mdev->resync_timer);
resync_timer_fn((unsigned long)mdev);

52
drivers/block/drbd/drbd_req.c
View file

@ -213,8 +213,7 @@ void _req_may_be_done(struct drbd_request *req, struct bio_and_error *m)
{
const unsigned long s = req->rq_state;
struct drbd_conf *mdev = req->w.mdev;
/* only WRITES may end up here without a master bio (on barrier ack) */
int rw = req->master_bio ? bio_data_dir(req->master_bio) : WRITE;
int rw = req->rq_state & RQ_WRITE ? WRITE : READ;
/* we must not complete the master bio, while it is
* still being processed by _drbd_send_zc_bio (drbd_send_dblock)
@ -225,7 +224,7 @@ void _req_may_be_done(struct drbd_request *req, struct bio_and_error *m)
* the receiver,
* the bio_endio completion callbacks.
*/
if (s & RQ_LOCAL_PENDING)
if (s & RQ_LOCAL_PENDING && !(s & RQ_LOCAL_ABORTED))
return;
if (req->i.waiting) {
/* Retry all conflicting peer requests. */
@ -288,6 +287,9 @@ void _req_may_be_done(struct drbd_request *req, struct bio_and_error *m)
req->master_bio = NULL;
}
if (s & RQ_LOCAL_PENDING)
return;
if ((s & RQ_NET_MASK) == 0 || (s & RQ_NET_DONE)) {
/* this is disconnected (local only) operation,
* or protocol C P_WRITE_ACK,
@ -362,7 +364,7 @@ int __req_mod(struct drbd_request *req, enum drbd_req_event what,
break;
case COMPLETED_OK:
if (bio_data_dir(req->master_bio) == WRITE)
if (req->rq_state & RQ_WRITE)
mdev->writ_cnt += req->i.size >> 9;
else
mdev->read_cnt += req->i.size >> 9;
@ -374,6 +376,14 @@ int __req_mod(struct drbd_request *req, enum drbd_req_event what,
put_ldev(mdev);
break;
case ABORT_DISK_IO:
req->rq_state |= RQ_LOCAL_ABORTED;
if (req->rq_state & RQ_WRITE)
_req_may_be_done_not_susp(req, m);
else
goto goto_queue_for_net_read;
break;
case WRITE_COMPLETED_WITH_ERROR:
req->rq_state |= RQ_LOCAL_COMPLETED;
req->rq_state &= ~RQ_LOCAL_PENDING;
@ -402,6 +412,8 @@ int __req_mod(struct drbd_request *req, enum drbd_req_event what,
__drbd_chk_io_error(mdev, false);
put_ldev(mdev);
goto_queue_for_net_read:
/* no point in retrying if there is no good remote data,
* or we have no connection. */
if (mdev->state.pdsk != D_UP_TO_DATE) {
@ -1071,14 +1083,21 @@ void request_timer_fn(unsigned long data)
struct drbd_request *req; /* oldest request */
struct list_head *le;
struct net_conf *nc;
unsigned long et; /* effective timeout = ko_count * timeout */
unsigned long ent = 0, dt = 0, et; /* effective timeout = ko_count * timeout */
rcu_read_lock();
nc = rcu_dereference(tconn->net_conf);
et = nc ? nc->timeout * HZ/10 * nc->ko_count : 0;
ent = nc ? nc->timeout * HZ/10 * nc->ko_count : 0;
if (get_ldev(mdev)) {
dt = rcu_dereference(mdev->ldev->disk_conf)->disk_timeout * HZ / 10;
put_ldev(mdev);
}
rcu_read_unlock();
if (!et || mdev->state.conn < C_WF_REPORT_PARAMS)
et = min_not_zero(dt, ent);
if (!et || (mdev->state.conn < C_WF_REPORT_PARAMS && mdev->state.disk <= D_FAILED))
return; /* Recurring timer stopped */
spin_lock_irq(&tconn->req_lock);
@ -1091,17 +1110,18 @@ void request_timer_fn(unsigned long data)
le = le->prev;
req = list_entry(le, struct drbd_request, tl_requests);
if (time_is_before_eq_jiffies(req->start_time + et)) {
if (req->rq_state & RQ_NET_PENDING) {
if (ent && req->rq_state & RQ_NET_PENDING) {
if (time_is_before_eq_jiffies(req->start_time + ent)) {
dev_warn(DEV, "Remote failed to finish a request within ko-count * timeout\n");
_drbd_set_state(_NS(mdev, conn, C_TIMEOUT), CS_VERBOSE, NULL);
} else {
dev_warn(DEV, "Local backing block device frozen?\n");
mod_timer(&mdev->request_timer, jiffies + et);
_drbd_set_state(_NS(mdev, conn, C_TIMEOUT), CS_VERBOSE | CS_HARD, NULL);
}
}
if (dt && req->rq_state & RQ_LOCAL_PENDING) {
if (time_is_before_eq_jiffies(req->start_time + dt)) {
dev_warn(DEV, "Local backing device failed to meet the disk-timeout\n");
__drbd_chk_io_error(mdev, 1);
}
} else {
mod_timer(&mdev->request_timer, req->start_time + et);
}
spin_unlock_irq(&tconn->req_lock);
mod_timer(&mdev->request_timer, req->start_time + et);
}

19
drivers/block/drbd/drbd_req.h
View file

@ -106,6 +106,7 @@ enum drbd_req_event {
READ_COMPLETED_WITH_ERROR,
READ_AHEAD_COMPLETED_WITH_ERROR,
WRITE_COMPLETED_WITH_ERROR,
ABORT_DISK_IO,
COMPLETED_OK,
RESEND,
FAIL_FROZEN_DISK_IO,
@ -119,18 +120,21 @@ enum drbd_req_event {
* same time, so we should hold the request lock anyways.
*/
enum drbd_req_state_bits {
/* 210
* 000: no local possible
* 001: to be submitted
/* 3210
* 0000: no local possible
* 0001: to be submitted
* UNUSED, we could map: 011: submitted, completion still pending
* 110: completed ok
* 010: completed with error
* 0110: completed ok
* 0010: completed with error
* 1001: Aborted (before completion)
* 1x10: Aborted and completed -> free
*/
__RQ_LOCAL_PENDING,
__RQ_LOCAL_COMPLETED,
__RQ_LOCAL_OK,
__RQ_LOCAL_ABORTED,
/* 76543
/* 87654
* 00000: no network possible
* 00001: to be send
* 00011: to be send, on worker queue
@ -209,8 +213,9 @@ enum drbd_req_state_bits {
#define RQ_LOCAL_PENDING (1UL << __RQ_LOCAL_PENDING)
#define RQ_LOCAL_COMPLETED (1UL << __RQ_LOCAL_COMPLETED)
#define RQ_LOCAL_OK (1UL << __RQ_LOCAL_OK)
#define RQ_LOCAL_ABORTED (1UL << __RQ_LOCAL_ABORTED)
#define RQ_LOCAL_MASK ((RQ_LOCAL_OK << 1)-1) /* 0x07 */
#define RQ_LOCAL_MASK ((RQ_LOCAL_ABORTED << 1)-1)
#define RQ_NET_PENDING (1UL << __RQ_NET_PENDING)
#define RQ_NET_QUEUED (1UL << __RQ_NET_QUEUED)

7
drivers/block/drbd/drbd_state.c
View file

@ -29,6 +29,9 @@
#include "drbd_int.h"
#include "drbd_req.h"
/* in drbd_main.c */
extern void tl_apply(struct drbd_conf *mdev, enum drbd_req_event what);
struct after_state_chg_work {
struct drbd_work w;
union drbd_state os;
@ -1315,6 +1318,10 @@ static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
rcu_read_unlock();
was_io_error = test_and_clear_bit(WAS_IO_ERROR, &mdev->flags);
/* Immediately allow completion of all application IO, that waits
for completion from the local disk. */
tl_apply(mdev, ABORT_DISK_IO);
/* current state still has to be D_FAILED,
* there is only one way out: to D_DISKLESS,
* and that may only happen after our put_ldev below. */

9
drivers/block/drbd/drbd_worker.c
View file

@ -67,11 +67,18 @@ rwlock_t global_state_lock;
void drbd_md_io_complete(struct bio *bio, int error)
{
struct drbd_md_io *md_io;
struct drbd_conf *mdev;
md_io = (struct drbd_md_io *)bio->bi_private;
mdev = container_of(md_io, struct drbd_conf, md_io);
md_io->error = error;
complete(&md_io->event);
md_io->done = 1;
wake_up(&mdev->misc_wait);
bio_put(bio);
drbd_md_put_buffer(mdev);
put_ldev(mdev);
}
/* reads on behalf of the partner,

9
include/linux/drbd_genl.h
View file

@ -128,6 +128,7 @@ GENL_struct(DRBD_NLA_DISK_CONF, 3, disk_conf,
__flg_field_def(17, DRBD_GENLA_F_MANDATORY, disk_flushes, DRBD_DISK_FLUSHES_DEF)
__flg_field_def(18, DRBD_GENLA_F_MANDATORY, disk_drain, DRBD_DISK_DRAIN_DEF)
__flg_field_def(19, DRBD_GENLA_F_MANDATORY, md_flushes, DRBD_MD_FLUSHES_DEF)
__u32_field_def(20, DRBD_GENLA_F_MANDATORY, disk_timeout, DRBD_DISK_TIMEOUT_DEF)
)
GENL_struct(DRBD_NLA_RESOURCE_OPTS, 4, res_opts,
@ -224,6 +225,10 @@ GENL_struct(DRBD_NLA_DISCONNECT_PARMS, 12, disconnect_parms,
__flg_field(1, DRBD_GENLA_F_MANDATORY, force_disconnect)
)
GENL_struct(DRBD_NLA_DETACH_PARMS, 13, detach_parms,
__flg_field(1, DRBD_GENLA_F_MANDATORY, force_detach)
)
/*
* Notifications and commands (genlmsghdr->cmd)
*/
@ -335,7 +340,9 @@ GENL_op(
)
GENL_op(DRBD_ADM_DETACH, 18, GENL_doit(drbd_adm_detach),
GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED))
GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED)
GENL_tla_expected(DRBD_NLA_DETACH_PARMS, DRBD_GENLA_F_MANDATORY))
GENL_op(DRBD_ADM_INVALIDATE, 19, GENL_doit(drbd_adm_invalidate),
GENL_tla_expected(DRBD_NLA_CFG_CONTEXT, DRBD_F_REQUIRED))
GENL_op(DRBD_ADM_INVAL_PEER, 20, GENL_doit(drbd_adm_invalidate_peer),

6
include/linux/drbd_limits.h
View file

@ -50,6 +50,12 @@
#define DRBD_TIMEOUT_MAX 600
#define DRBD_TIMEOUT_DEF 60 /* 6 seconds */
/* If backing disk takes longer than disk_timeout, mark the disk as failed */
#define DRBD_DISK_TIMEOUT_MIN 0 /* 0 = disabled */
#define DRBD_DISK_TIMEOUT_MAX 6000 /* 10 Minutes */
#define DRBD_DISK_TIMEOUT_DEF 0 /* disabled */
#define DRBD_DISK_TIMEOUT_SCALE '1'
/* active connection retries when C_WF_CONNECTION */
#define DRBD_CONNECT_INT_MIN 1
#define DRBD_CONNECT_INT_MAX 120