forked from Minki/linux
00d56944ff
No longer work callbacks must operate on a mdev. From now on they can also operate on a tconn. Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com> Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
1271 lines
34 KiB
C
1271 lines
34 KiB
C
/*
|
|
drbd_actlog.c
|
|
|
|
This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
|
|
|
|
Copyright (C) 2003-2008, LINBIT Information Technologies GmbH.
|
|
Copyright (C) 2003-2008, Philipp Reisner <philipp.reisner@linbit.com>.
|
|
Copyright (C) 2003-2008, Lars Ellenberg <lars.ellenberg@linbit.com>.
|
|
|
|
drbd is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; either version 2, or (at your option)
|
|
any later version.
|
|
|
|
drbd is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with drbd; see the file COPYING. If not, write to
|
|
the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
|
|
|
|
*/
|
|
|
|
#include <linux/slab.h>
|
|
#include <linux/drbd.h>
|
|
#include "drbd_int.h"
|
|
#include "drbd_wrappers.h"
|
|
|
|
/* We maintain a trivial checksum in our on disk activity log.
|
|
* With that we can ensure correct operation even when the storage
|
|
* device might do a partial (last) sector write while losing power.
|
|
*/
|
|
struct __packed al_transaction {
|
|
u32 magic;
|
|
u32 tr_number;
|
|
struct __packed {
|
|
u32 pos;
|
|
u32 extent; } updates[1 + AL_EXTENTS_PT];
|
|
u32 xor_sum;
|
|
};
|
|
|
|
struct update_odbm_work {
|
|
struct drbd_work w;
|
|
unsigned int enr;
|
|
};
|
|
|
|
struct update_al_work {
|
|
struct drbd_work w;
|
|
struct lc_element *al_ext;
|
|
struct completion event;
|
|
unsigned int enr;
|
|
/* if old_enr != LC_FREE, write corresponding bitmap sector, too */
|
|
unsigned int old_enr;
|
|
};
|
|
|
|
struct drbd_atodb_wait {
|
|
atomic_t count;
|
|
struct completion io_done;
|
|
struct drbd_conf *mdev;
|
|
int error;
|
|
};
|
|
|
|
|
|
int w_al_write_transaction(struct drbd_work *, int);
|
|
|
|
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 ok;
|
|
|
|
md_io.mdev = mdev;
|
|
init_completion(&md_io.event);
|
|
md_io.error = 0;
|
|
|
|
if ((rw & WRITE) && !test_bit(MD_NO_FUA, &mdev->flags))
|
|
rw |= REQ_FUA | REQ_FLUSH;
|
|
rw |= REQ_SYNC;
|
|
|
|
bio = bio_alloc(GFP_NOIO, 1);
|
|
bio->bi_bdev = bdev->md_bdev;
|
|
bio->bi_sector = sector;
|
|
ok = (bio_add_page(bio, page, size, 0) == size);
|
|
if (!ok)
|
|
goto out;
|
|
bio->bi_private = &md_io;
|
|
bio->bi_end_io = drbd_md_io_complete;
|
|
bio->bi_rw = rw;
|
|
|
|
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);
|
|
ok = bio_flagged(bio, BIO_UPTODATE) && md_io.error == 0;
|
|
|
|
out:
|
|
bio_put(bio);
|
|
return ok;
|
|
}
|
|
|
|
int drbd_md_sync_page_io(struct drbd_conf *mdev, struct drbd_backing_dev *bdev,
|
|
sector_t sector, int rw)
|
|
{
|
|
int logical_block_size, mask, ok;
|
|
int offset = 0;
|
|
struct page *iop = mdev->md_io_page;
|
|
|
|
D_ASSERT(mutex_is_locked(&mdev->md_io_mutex));
|
|
|
|
BUG_ON(!bdev->md_bdev);
|
|
|
|
logical_block_size = bdev_logical_block_size(bdev->md_bdev);
|
|
if (logical_block_size == 0)
|
|
logical_block_size = MD_SECTOR_SIZE;
|
|
|
|
/* in case logical_block_size != 512 [ s390 only? ] */
|
|
if (logical_block_size != MD_SECTOR_SIZE) {
|
|
mask = (logical_block_size / MD_SECTOR_SIZE) - 1;
|
|
D_ASSERT(mask == 1 || mask == 3 || mask == 7);
|
|
D_ASSERT(logical_block_size == (mask+1) * MD_SECTOR_SIZE);
|
|
offset = sector & mask;
|
|
sector = sector & ~mask;
|
|
iop = mdev->md_io_tmpp;
|
|
|
|
if (rw & WRITE) {
|
|
/* these are GFP_KERNEL pages, pre-allocated
|
|
* on device initialization */
|
|
void *p = page_address(mdev->md_io_page);
|
|
void *hp = page_address(mdev->md_io_tmpp);
|
|
|
|
ok = _drbd_md_sync_page_io(mdev, bdev, iop, sector,
|
|
READ, logical_block_size);
|
|
|
|
if (unlikely(!ok)) {
|
|
dev_err(DEV, "drbd_md_sync_page_io(,%llus,"
|
|
"READ [logical_block_size!=512]) failed!\n",
|
|
(unsigned long long)sector);
|
|
return 0;
|
|
}
|
|
|
|
memcpy(hp + offset*MD_SECTOR_SIZE, p, MD_SECTOR_SIZE);
|
|
}
|
|
}
|
|
|
|
if (sector < drbd_md_first_sector(bdev) ||
|
|
sector > drbd_md_last_sector(bdev))
|
|
dev_alert(DEV, "%s [%d]:%s(,%llus,%s) out of range md access!\n",
|
|
current->comm, current->pid, __func__,
|
|
(unsigned long long)sector, (rw & WRITE) ? "WRITE" : "READ");
|
|
|
|
ok = _drbd_md_sync_page_io(mdev, bdev, iop, sector, rw, logical_block_size);
|
|
if (unlikely(!ok)) {
|
|
dev_err(DEV, "drbd_md_sync_page_io(,%llus,%s) failed!\n",
|
|
(unsigned long long)sector, (rw & WRITE) ? "WRITE" : "READ");
|
|
return 0;
|
|
}
|
|
|
|
if (logical_block_size != MD_SECTOR_SIZE && !(rw & WRITE)) {
|
|
void *p = page_address(mdev->md_io_page);
|
|
void *hp = page_address(mdev->md_io_tmpp);
|
|
|
|
memcpy(p, hp + offset*MD_SECTOR_SIZE, MD_SECTOR_SIZE);
|
|
}
|
|
|
|
return ok;
|
|
}
|
|
|
|
static struct lc_element *_al_get(struct drbd_conf *mdev, unsigned int enr)
|
|
{
|
|
struct lc_element *al_ext;
|
|
struct lc_element *tmp;
|
|
unsigned long al_flags = 0;
|
|
int wake;
|
|
|
|
spin_lock_irq(&mdev->al_lock);
|
|
tmp = lc_find(mdev->resync, enr/AL_EXT_PER_BM_SECT);
|
|
if (unlikely(tmp != NULL)) {
|
|
struct bm_extent *bm_ext = lc_entry(tmp, struct bm_extent, lce);
|
|
if (test_bit(BME_NO_WRITES, &bm_ext->flags)) {
|
|
wake = !test_and_set_bit(BME_PRIORITY, &bm_ext->flags);
|
|
spin_unlock_irq(&mdev->al_lock);
|
|
if (wake)
|
|
wake_up(&mdev->al_wait);
|
|
return NULL;
|
|
}
|
|
}
|
|
al_ext = lc_get(mdev->act_log, enr);
|
|
al_flags = mdev->act_log->flags;
|
|
spin_unlock_irq(&mdev->al_lock);
|
|
|
|
/*
|
|
if (!al_ext) {
|
|
if (al_flags & LC_STARVING)
|
|
dev_warn(DEV, "Have to wait for LRU element (AL too small?)\n");
|
|
if (al_flags & LC_DIRTY)
|
|
dev_warn(DEV, "Ongoing AL update (AL device too slow?)\n");
|
|
}
|
|
*/
|
|
|
|
return al_ext;
|
|
}
|
|
|
|
void drbd_al_begin_io(struct drbd_conf *mdev, sector_t sector)
|
|
{
|
|
unsigned int enr = (sector >> (AL_EXTENT_SHIFT-9));
|
|
struct lc_element *al_ext;
|
|
struct update_al_work al_work;
|
|
|
|
D_ASSERT(atomic_read(&mdev->local_cnt) > 0);
|
|
|
|
wait_event(mdev->al_wait, (al_ext = _al_get(mdev, enr)));
|
|
|
|
if (al_ext->lc_number != enr) {
|
|
/* drbd_al_write_transaction(mdev,al_ext,enr);
|
|
* recurses into generic_make_request(), which
|
|
* disallows recursion, bios being serialized on the
|
|
* current->bio_tail list now.
|
|
* we have to delegate updates to the activity log
|
|
* to the worker thread. */
|
|
init_completion(&al_work.event);
|
|
al_work.al_ext = al_ext;
|
|
al_work.enr = enr;
|
|
al_work.old_enr = al_ext->lc_number;
|
|
al_work.w.cb = w_al_write_transaction;
|
|
al_work.w.mdev = mdev;
|
|
drbd_queue_work_front(&mdev->tconn->data.work, &al_work.w);
|
|
wait_for_completion(&al_work.event);
|
|
|
|
mdev->al_writ_cnt++;
|
|
|
|
spin_lock_irq(&mdev->al_lock);
|
|
lc_changed(mdev->act_log, al_ext);
|
|
spin_unlock_irq(&mdev->al_lock);
|
|
wake_up(&mdev->al_wait);
|
|
}
|
|
}
|
|
|
|
void drbd_al_complete_io(struct drbd_conf *mdev, sector_t sector)
|
|
{
|
|
unsigned int enr = (sector >> (AL_EXTENT_SHIFT-9));
|
|
struct lc_element *extent;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&mdev->al_lock, flags);
|
|
|
|
extent = lc_find(mdev->act_log, enr);
|
|
|
|
if (!extent) {
|
|
spin_unlock_irqrestore(&mdev->al_lock, flags);
|
|
dev_err(DEV, "al_complete_io() called on inactive extent %u\n", enr);
|
|
return;
|
|
}
|
|
|
|
if (lc_put(mdev->act_log, extent) == 0)
|
|
wake_up(&mdev->al_wait);
|
|
|
|
spin_unlock_irqrestore(&mdev->al_lock, flags);
|
|
}
|
|
|
|
#if (PAGE_SHIFT + 3) < (AL_EXTENT_SHIFT - BM_BLOCK_SHIFT)
|
|
/* Currently BM_BLOCK_SHIFT, BM_EXT_SHIFT and AL_EXTENT_SHIFT
|
|
* are still coupled, or assume too much about their relation.
|
|
* Code below will not work if this is violated.
|
|
* Will be cleaned up with some followup patch.
|
|
*/
|
|
# error FIXME
|
|
#endif
|
|
|
|
static unsigned int al_extent_to_bm_page(unsigned int al_enr)
|
|
{
|
|
return al_enr >>
|
|
/* bit to page */
|
|
((PAGE_SHIFT + 3) -
|
|
/* al extent number to bit */
|
|
(AL_EXTENT_SHIFT - BM_BLOCK_SHIFT));
|
|
}
|
|
|
|
static unsigned int rs_extent_to_bm_page(unsigned int rs_enr)
|
|
{
|
|
return rs_enr >>
|
|
/* bit to page */
|
|
((PAGE_SHIFT + 3) -
|
|
/* al extent number to bit */
|
|
(BM_EXT_SHIFT - BM_BLOCK_SHIFT));
|
|
}
|
|
|
|
int
|
|
w_al_write_transaction(struct drbd_work *w, int unused)
|
|
{
|
|
struct update_al_work *aw = container_of(w, struct update_al_work, w);
|
|
struct drbd_conf *mdev = w->mdev;
|
|
struct lc_element *updated = aw->al_ext;
|
|
const unsigned int new_enr = aw->enr;
|
|
const unsigned int evicted = aw->old_enr;
|
|
struct al_transaction *buffer;
|
|
sector_t sector;
|
|
int i, n, mx;
|
|
unsigned int extent_nr;
|
|
u32 xor_sum = 0;
|
|
|
|
if (!get_ldev(mdev)) {
|
|
dev_err(DEV,
|
|
"disk is %s, cannot start al transaction (-%d +%d)\n",
|
|
drbd_disk_str(mdev->state.disk), evicted, new_enr);
|
|
complete(&((struct update_al_work *)w)->event);
|
|
return 1;
|
|
}
|
|
/* do we have to do a bitmap write, first?
|
|
* TODO reduce maximum latency:
|
|
* submit both bios, then wait for both,
|
|
* instead of doing two synchronous sector writes.
|
|
* For now, we must not write the transaction,
|
|
* if we cannot write out the bitmap of the evicted extent. */
|
|
if (mdev->state.conn < C_CONNECTED && evicted != LC_FREE)
|
|
drbd_bm_write_page(mdev, al_extent_to_bm_page(evicted));
|
|
|
|
/* The bitmap write may have failed, causing a state change. */
|
|
if (mdev->state.disk < D_INCONSISTENT) {
|
|
dev_err(DEV,
|
|
"disk is %s, cannot write al transaction (-%d +%d)\n",
|
|
drbd_disk_str(mdev->state.disk), evicted, new_enr);
|
|
complete(&((struct update_al_work *)w)->event);
|
|
put_ldev(mdev);
|
|
return 1;
|
|
}
|
|
|
|
mutex_lock(&mdev->md_io_mutex); /* protects md_io_buffer, al_tr_cycle, ... */
|
|
buffer = (struct al_transaction *)page_address(mdev->md_io_page);
|
|
|
|
buffer->magic = __constant_cpu_to_be32(DRBD_MAGIC);
|
|
buffer->tr_number = cpu_to_be32(mdev->al_tr_number);
|
|
|
|
n = lc_index_of(mdev->act_log, updated);
|
|
|
|
buffer->updates[0].pos = cpu_to_be32(n);
|
|
buffer->updates[0].extent = cpu_to_be32(new_enr);
|
|
|
|
xor_sum ^= new_enr;
|
|
|
|
mx = min_t(int, AL_EXTENTS_PT,
|
|
mdev->act_log->nr_elements - mdev->al_tr_cycle);
|
|
for (i = 0; i < mx; i++) {
|
|
unsigned idx = mdev->al_tr_cycle + i;
|
|
extent_nr = lc_element_by_index(mdev->act_log, idx)->lc_number;
|
|
buffer->updates[i+1].pos = cpu_to_be32(idx);
|
|
buffer->updates[i+1].extent = cpu_to_be32(extent_nr);
|
|
xor_sum ^= extent_nr;
|
|
}
|
|
for (; i < AL_EXTENTS_PT; i++) {
|
|
buffer->updates[i+1].pos = __constant_cpu_to_be32(-1);
|
|
buffer->updates[i+1].extent = __constant_cpu_to_be32(LC_FREE);
|
|
xor_sum ^= LC_FREE;
|
|
}
|
|
mdev->al_tr_cycle += AL_EXTENTS_PT;
|
|
if (mdev->al_tr_cycle >= mdev->act_log->nr_elements)
|
|
mdev->al_tr_cycle = 0;
|
|
|
|
buffer->xor_sum = cpu_to_be32(xor_sum);
|
|
|
|
sector = mdev->ldev->md.md_offset
|
|
+ mdev->ldev->md.al_offset + mdev->al_tr_pos;
|
|
|
|
if (!drbd_md_sync_page_io(mdev, mdev->ldev, sector, WRITE))
|
|
drbd_chk_io_error(mdev, 1, true);
|
|
|
|
if (++mdev->al_tr_pos >
|
|
div_ceil(mdev->act_log->nr_elements, AL_EXTENTS_PT))
|
|
mdev->al_tr_pos = 0;
|
|
|
|
D_ASSERT(mdev->al_tr_pos < MD_AL_MAX_SIZE);
|
|
mdev->al_tr_number++;
|
|
|
|
mutex_unlock(&mdev->md_io_mutex);
|
|
|
|
complete(&((struct update_al_work *)w)->event);
|
|
put_ldev(mdev);
|
|
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* drbd_al_read_tr() - Read a single transaction from the on disk activity log
|
|
* @mdev: DRBD device.
|
|
* @bdev: Block device to read form.
|
|
* @b: pointer to an al_transaction.
|
|
* @index: On disk slot of the transaction to read.
|
|
*
|
|
* Returns -1 on IO error, 0 on checksum error and 1 upon success.
|
|
*/
|
|
static int drbd_al_read_tr(struct drbd_conf *mdev,
|
|
struct drbd_backing_dev *bdev,
|
|
struct al_transaction *b,
|
|
int index)
|
|
{
|
|
sector_t sector;
|
|
int rv, i;
|
|
u32 xor_sum = 0;
|
|
|
|
sector = bdev->md.md_offset + bdev->md.al_offset + index;
|
|
|
|
/* Dont process error normally,
|
|
* as this is done before disk is attached! */
|
|
if (!drbd_md_sync_page_io(mdev, bdev, sector, READ))
|
|
return -1;
|
|
|
|
rv = (b->magic == cpu_to_be32(DRBD_MAGIC));
|
|
|
|
for (i = 0; i < AL_EXTENTS_PT + 1; i++)
|
|
xor_sum ^= be32_to_cpu(b->updates[i].extent);
|
|
rv &= (xor_sum == be32_to_cpu(b->xor_sum));
|
|
|
|
return rv;
|
|
}
|
|
|
|
/**
|
|
* drbd_al_read_log() - Restores the activity log from its on disk representation.
|
|
* @mdev: DRBD device.
|
|
* @bdev: Block device to read form.
|
|
*
|
|
* Returns 1 on success, returns 0 when reading the log failed due to IO errors.
|
|
*/
|
|
int drbd_al_read_log(struct drbd_conf *mdev, struct drbd_backing_dev *bdev)
|
|
{
|
|
struct al_transaction *buffer;
|
|
int i;
|
|
int rv;
|
|
int mx;
|
|
int active_extents = 0;
|
|
int transactions = 0;
|
|
int found_valid = 0;
|
|
int from = 0;
|
|
int to = 0;
|
|
u32 from_tnr = 0;
|
|
u32 to_tnr = 0;
|
|
u32 cnr;
|
|
|
|
mx = div_ceil(mdev->act_log->nr_elements, AL_EXTENTS_PT);
|
|
|
|
/* lock out all other meta data io for now,
|
|
* and make sure the page is mapped.
|
|
*/
|
|
mutex_lock(&mdev->md_io_mutex);
|
|
buffer = page_address(mdev->md_io_page);
|
|
|
|
/* Find the valid transaction in the log */
|
|
for (i = 0; i <= mx; i++) {
|
|
rv = drbd_al_read_tr(mdev, bdev, buffer, i);
|
|
if (rv == 0)
|
|
continue;
|
|
if (rv == -1) {
|
|
mutex_unlock(&mdev->md_io_mutex);
|
|
return 0;
|
|
}
|
|
cnr = be32_to_cpu(buffer->tr_number);
|
|
|
|
if (++found_valid == 1) {
|
|
from = i;
|
|
to = i;
|
|
from_tnr = cnr;
|
|
to_tnr = cnr;
|
|
continue;
|
|
}
|
|
if ((int)cnr - (int)from_tnr < 0) {
|
|
D_ASSERT(from_tnr - cnr + i - from == mx+1);
|
|
from = i;
|
|
from_tnr = cnr;
|
|
}
|
|
if ((int)cnr - (int)to_tnr > 0) {
|
|
D_ASSERT(cnr - to_tnr == i - to);
|
|
to = i;
|
|
to_tnr = cnr;
|
|
}
|
|
}
|
|
|
|
if (!found_valid) {
|
|
dev_warn(DEV, "No usable activity log found.\n");
|
|
mutex_unlock(&mdev->md_io_mutex);
|
|
return 1;
|
|
}
|
|
|
|
/* Read the valid transactions.
|
|
* dev_info(DEV, "Reading from %d to %d.\n",from,to); */
|
|
i = from;
|
|
while (1) {
|
|
int j, pos;
|
|
unsigned int extent_nr;
|
|
unsigned int trn;
|
|
|
|
rv = drbd_al_read_tr(mdev, bdev, buffer, i);
|
|
if (!expect(rv != 0))
|
|
goto cancel;
|
|
if (rv == -1) {
|
|
mutex_unlock(&mdev->md_io_mutex);
|
|
return 0;
|
|
}
|
|
|
|
trn = be32_to_cpu(buffer->tr_number);
|
|
|
|
spin_lock_irq(&mdev->al_lock);
|
|
|
|
/* This loop runs backwards because in the cyclic
|
|
elements there might be an old version of the
|
|
updated element (in slot 0). So the element in slot 0
|
|
can overwrite old versions. */
|
|
for (j = AL_EXTENTS_PT; j >= 0; j--) {
|
|
pos = be32_to_cpu(buffer->updates[j].pos);
|
|
extent_nr = be32_to_cpu(buffer->updates[j].extent);
|
|
|
|
if (extent_nr == LC_FREE)
|
|
continue;
|
|
|
|
lc_set(mdev->act_log, extent_nr, pos);
|
|
active_extents++;
|
|
}
|
|
spin_unlock_irq(&mdev->al_lock);
|
|
|
|
transactions++;
|
|
|
|
cancel:
|
|
if (i == to)
|
|
break;
|
|
i++;
|
|
if (i > mx)
|
|
i = 0;
|
|
}
|
|
|
|
mdev->al_tr_number = to_tnr+1;
|
|
mdev->al_tr_pos = to;
|
|
if (++mdev->al_tr_pos >
|
|
div_ceil(mdev->act_log->nr_elements, AL_EXTENTS_PT))
|
|
mdev->al_tr_pos = 0;
|
|
|
|
/* ok, we are done with it */
|
|
mutex_unlock(&mdev->md_io_mutex);
|
|
|
|
dev_info(DEV, "Found %d transactions (%d active extents) in activity log.\n",
|
|
transactions, active_extents);
|
|
|
|
return 1;
|
|
}
|
|
|
|
/**
|
|
* drbd_al_apply_to_bm() - Sets the bitmap to diry(1) where covered ba active AL extents
|
|
* @mdev: DRBD device.
|
|
*/
|
|
void drbd_al_apply_to_bm(struct drbd_conf *mdev)
|
|
{
|
|
unsigned int enr;
|
|
unsigned long add = 0;
|
|
char ppb[10];
|
|
int i, tmp;
|
|
|
|
wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
|
|
|
|
for (i = 0; i < mdev->act_log->nr_elements; i++) {
|
|
enr = lc_element_by_index(mdev->act_log, i)->lc_number;
|
|
if (enr == LC_FREE)
|
|
continue;
|
|
tmp = drbd_bm_ALe_set_all(mdev, enr);
|
|
dynamic_dev_dbg(DEV, "AL: set %d bits in extent %u\n", tmp, enr);
|
|
add += tmp;
|
|
}
|
|
|
|
lc_unlock(mdev->act_log);
|
|
wake_up(&mdev->al_wait);
|
|
|
|
dev_info(DEV, "Marked additional %s as out-of-sync based on AL.\n",
|
|
ppsize(ppb, Bit2KB(add)));
|
|
}
|
|
|
|
static int _try_lc_del(struct drbd_conf *mdev, struct lc_element *al_ext)
|
|
{
|
|
int rv;
|
|
|
|
spin_lock_irq(&mdev->al_lock);
|
|
rv = (al_ext->refcnt == 0);
|
|
if (likely(rv))
|
|
lc_del(mdev->act_log, al_ext);
|
|
spin_unlock_irq(&mdev->al_lock);
|
|
|
|
return rv;
|
|
}
|
|
|
|
/**
|
|
* drbd_al_shrink() - Removes all active extents form the activity log
|
|
* @mdev: DRBD device.
|
|
*
|
|
* Removes all active extents form the activity log, waiting until
|
|
* the reference count of each entry dropped to 0 first, of course.
|
|
*
|
|
* You need to lock mdev->act_log with lc_try_lock() / lc_unlock()
|
|
*/
|
|
void drbd_al_shrink(struct drbd_conf *mdev)
|
|
{
|
|
struct lc_element *al_ext;
|
|
int i;
|
|
|
|
D_ASSERT(test_bit(__LC_DIRTY, &mdev->act_log->flags));
|
|
|
|
for (i = 0; i < mdev->act_log->nr_elements; i++) {
|
|
al_ext = lc_element_by_index(mdev->act_log, i);
|
|
if (al_ext->lc_number == LC_FREE)
|
|
continue;
|
|
wait_event(mdev->al_wait, _try_lc_del(mdev, al_ext));
|
|
}
|
|
|
|
wake_up(&mdev->al_wait);
|
|
}
|
|
|
|
static int w_update_odbm(struct drbd_work *w, int unused)
|
|
{
|
|
struct update_odbm_work *udw = container_of(w, struct update_odbm_work, w);
|
|
struct drbd_conf *mdev = w->mdev;
|
|
|
|
if (!get_ldev(mdev)) {
|
|
if (__ratelimit(&drbd_ratelimit_state))
|
|
dev_warn(DEV, "Can not update on disk bitmap, local IO disabled.\n");
|
|
kfree(udw);
|
|
return 1;
|
|
}
|
|
|
|
drbd_bm_write_page(mdev, rs_extent_to_bm_page(udw->enr));
|
|
put_ldev(mdev);
|
|
|
|
kfree(udw);
|
|
|
|
if (drbd_bm_total_weight(mdev) <= mdev->rs_failed) {
|
|
switch (mdev->state.conn) {
|
|
case C_SYNC_SOURCE: case C_SYNC_TARGET:
|
|
case C_PAUSED_SYNC_S: case C_PAUSED_SYNC_T:
|
|
drbd_resync_finished(mdev);
|
|
default:
|
|
/* nothing to do */
|
|
break;
|
|
}
|
|
}
|
|
drbd_bcast_sync_progress(mdev);
|
|
|
|
return 1;
|
|
}
|
|
|
|
|
|
/* ATTENTION. The AL's extents are 4MB each, while the extents in the
|
|
* resync LRU-cache are 16MB each.
|
|
* The caller of this function has to hold an get_ldev() reference.
|
|
*
|
|
* TODO will be obsoleted once we have a caching lru of the on disk bitmap
|
|
*/
|
|
static void drbd_try_clear_on_disk_bm(struct drbd_conf *mdev, sector_t sector,
|
|
int count, int success)
|
|
{
|
|
struct lc_element *e;
|
|
struct update_odbm_work *udw;
|
|
|
|
unsigned int enr;
|
|
|
|
D_ASSERT(atomic_read(&mdev->local_cnt));
|
|
|
|
/* I simply assume that a sector/size pair never crosses
|
|
* a 16 MB extent border. (Currently this is true...) */
|
|
enr = BM_SECT_TO_EXT(sector);
|
|
|
|
e = lc_get(mdev->resync, enr);
|
|
if (e) {
|
|
struct bm_extent *ext = lc_entry(e, struct bm_extent, lce);
|
|
if (ext->lce.lc_number == enr) {
|
|
if (success)
|
|
ext->rs_left -= count;
|
|
else
|
|
ext->rs_failed += count;
|
|
if (ext->rs_left < ext->rs_failed) {
|
|
dev_err(DEV, "BAD! sector=%llus enr=%u rs_left=%d "
|
|
"rs_failed=%d count=%d\n",
|
|
(unsigned long long)sector,
|
|
ext->lce.lc_number, ext->rs_left,
|
|
ext->rs_failed, count);
|
|
dump_stack();
|
|
|
|
lc_put(mdev->resync, &ext->lce);
|
|
drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
|
|
return;
|
|
}
|
|
} else {
|
|
/* Normally this element should be in the cache,
|
|
* since drbd_rs_begin_io() pulled it already in.
|
|
*
|
|
* But maybe an application write finished, and we set
|
|
* something outside the resync lru_cache in sync.
|
|
*/
|
|
int rs_left = drbd_bm_e_weight(mdev, enr);
|
|
if (ext->flags != 0) {
|
|
dev_warn(DEV, "changing resync lce: %d[%u;%02lx]"
|
|
" -> %d[%u;00]\n",
|
|
ext->lce.lc_number, ext->rs_left,
|
|
ext->flags, enr, rs_left);
|
|
ext->flags = 0;
|
|
}
|
|
if (ext->rs_failed) {
|
|
dev_warn(DEV, "Kicking resync_lru element enr=%u "
|
|
"out with rs_failed=%d\n",
|
|
ext->lce.lc_number, ext->rs_failed);
|
|
}
|
|
ext->rs_left = rs_left;
|
|
ext->rs_failed = success ? 0 : count;
|
|
lc_changed(mdev->resync, &ext->lce);
|
|
}
|
|
lc_put(mdev->resync, &ext->lce);
|
|
/* no race, we are within the al_lock! */
|
|
|
|
if (ext->rs_left == ext->rs_failed) {
|
|
ext->rs_failed = 0;
|
|
|
|
udw = kmalloc(sizeof(*udw), GFP_ATOMIC);
|
|
if (udw) {
|
|
udw->enr = ext->lce.lc_number;
|
|
udw->w.cb = w_update_odbm;
|
|
udw->w.mdev = mdev;
|
|
drbd_queue_work_front(&mdev->tconn->data.work, &udw->w);
|
|
} else {
|
|
dev_warn(DEV, "Could not kmalloc an udw\n");
|
|
}
|
|
}
|
|
} else {
|
|
dev_err(DEV, "lc_get() failed! locked=%d/%d flags=%lu\n",
|
|
mdev->resync_locked,
|
|
mdev->resync->nr_elements,
|
|
mdev->resync->flags);
|
|
}
|
|
}
|
|
|
|
void drbd_advance_rs_marks(struct drbd_conf *mdev, unsigned long still_to_go)
|
|
{
|
|
unsigned long now = jiffies;
|
|
unsigned long last = mdev->rs_mark_time[mdev->rs_last_mark];
|
|
int next = (mdev->rs_last_mark + 1) % DRBD_SYNC_MARKS;
|
|
if (time_after_eq(now, last + DRBD_SYNC_MARK_STEP)) {
|
|
if (mdev->rs_mark_left[mdev->rs_last_mark] != still_to_go &&
|
|
mdev->state.conn != C_PAUSED_SYNC_T &&
|
|
mdev->state.conn != C_PAUSED_SYNC_S) {
|
|
mdev->rs_mark_time[next] = now;
|
|
mdev->rs_mark_left[next] = still_to_go;
|
|
mdev->rs_last_mark = next;
|
|
}
|
|
}
|
|
}
|
|
|
|
/* clear the bit corresponding to the piece of storage in question:
|
|
* size byte of data starting from sector. Only clear a bits of the affected
|
|
* one ore more _aligned_ BM_BLOCK_SIZE blocks.
|
|
*
|
|
* called by worker on C_SYNC_TARGET and receiver on SyncSource.
|
|
*
|
|
*/
|
|
void __drbd_set_in_sync(struct drbd_conf *mdev, sector_t sector, int size,
|
|
const char *file, const unsigned int line)
|
|
{
|
|
/* Is called from worker and receiver context _only_ */
|
|
unsigned long sbnr, ebnr, lbnr;
|
|
unsigned long count = 0;
|
|
sector_t esector, nr_sectors;
|
|
int wake_up = 0;
|
|
unsigned long flags;
|
|
|
|
if (size <= 0 || (size & 0x1ff) != 0 || size > DRBD_MAX_BIO_SIZE) {
|
|
dev_err(DEV, "drbd_set_in_sync: sector=%llus size=%d nonsense!\n",
|
|
(unsigned long long)sector, size);
|
|
return;
|
|
}
|
|
nr_sectors = drbd_get_capacity(mdev->this_bdev);
|
|
esector = sector + (size >> 9) - 1;
|
|
|
|
if (!expect(sector < nr_sectors))
|
|
return;
|
|
if (!expect(esector < nr_sectors))
|
|
esector = nr_sectors - 1;
|
|
|
|
lbnr = BM_SECT_TO_BIT(nr_sectors-1);
|
|
|
|
/* we clear it (in sync).
|
|
* round up start sector, round down end sector. we make sure we only
|
|
* clear full, aligned, BM_BLOCK_SIZE (4K) blocks */
|
|
if (unlikely(esector < BM_SECT_PER_BIT-1))
|
|
return;
|
|
if (unlikely(esector == (nr_sectors-1)))
|
|
ebnr = lbnr;
|
|
else
|
|
ebnr = BM_SECT_TO_BIT(esector - (BM_SECT_PER_BIT-1));
|
|
sbnr = BM_SECT_TO_BIT(sector + BM_SECT_PER_BIT-1);
|
|
|
|
if (sbnr > ebnr)
|
|
return;
|
|
|
|
/*
|
|
* ok, (capacity & 7) != 0 sometimes, but who cares...
|
|
* we count rs_{total,left} in bits, not sectors.
|
|
*/
|
|
count = drbd_bm_clear_bits(mdev, sbnr, ebnr);
|
|
if (count && get_ldev(mdev)) {
|
|
drbd_advance_rs_marks(mdev, drbd_bm_total_weight(mdev));
|
|
spin_lock_irqsave(&mdev->al_lock, flags);
|
|
drbd_try_clear_on_disk_bm(mdev, sector, count, true);
|
|
spin_unlock_irqrestore(&mdev->al_lock, flags);
|
|
|
|
/* just wake_up unconditional now, various lc_chaged(),
|
|
* lc_put() in drbd_try_clear_on_disk_bm(). */
|
|
wake_up = 1;
|
|
put_ldev(mdev);
|
|
}
|
|
if (wake_up)
|
|
wake_up(&mdev->al_wait);
|
|
}
|
|
|
|
/*
|
|
* this is intended to set one request worth of data out of sync.
|
|
* affects at least 1 bit,
|
|
* and at most 1+DRBD_MAX_BIO_SIZE/BM_BLOCK_SIZE bits.
|
|
*
|
|
* called by tl_clear and drbd_send_dblock (==drbd_make_request).
|
|
* so this can be _any_ process.
|
|
*/
|
|
int __drbd_set_out_of_sync(struct drbd_conf *mdev, sector_t sector, int size,
|
|
const char *file, const unsigned int line)
|
|
{
|
|
unsigned long sbnr, ebnr, lbnr, flags;
|
|
sector_t esector, nr_sectors;
|
|
unsigned int enr, count = 0;
|
|
struct lc_element *e;
|
|
|
|
if (size <= 0 || (size & 0x1ff) != 0 || size > DRBD_MAX_BIO_SIZE) {
|
|
dev_err(DEV, "sector: %llus, size: %d\n",
|
|
(unsigned long long)sector, size);
|
|
return 0;
|
|
}
|
|
|
|
if (!get_ldev(mdev))
|
|
return 0; /* no disk, no metadata, no bitmap to set bits in */
|
|
|
|
nr_sectors = drbd_get_capacity(mdev->this_bdev);
|
|
esector = sector + (size >> 9) - 1;
|
|
|
|
if (!expect(sector < nr_sectors))
|
|
goto out;
|
|
if (!expect(esector < nr_sectors))
|
|
esector = nr_sectors - 1;
|
|
|
|
lbnr = BM_SECT_TO_BIT(nr_sectors-1);
|
|
|
|
/* we set it out of sync,
|
|
* we do not need to round anything here */
|
|
sbnr = BM_SECT_TO_BIT(sector);
|
|
ebnr = BM_SECT_TO_BIT(esector);
|
|
|
|
/* ok, (capacity & 7) != 0 sometimes, but who cares...
|
|
* we count rs_{total,left} in bits, not sectors. */
|
|
spin_lock_irqsave(&mdev->al_lock, flags);
|
|
count = drbd_bm_set_bits(mdev, sbnr, ebnr);
|
|
|
|
enr = BM_SECT_TO_EXT(sector);
|
|
e = lc_find(mdev->resync, enr);
|
|
if (e)
|
|
lc_entry(e, struct bm_extent, lce)->rs_left += count;
|
|
spin_unlock_irqrestore(&mdev->al_lock, flags);
|
|
|
|
out:
|
|
put_ldev(mdev);
|
|
|
|
return count;
|
|
}
|
|
|
|
static
|
|
struct bm_extent *_bme_get(struct drbd_conf *mdev, unsigned int enr)
|
|
{
|
|
struct lc_element *e;
|
|
struct bm_extent *bm_ext;
|
|
int wakeup = 0;
|
|
unsigned long rs_flags;
|
|
|
|
spin_lock_irq(&mdev->al_lock);
|
|
if (mdev->resync_locked > mdev->resync->nr_elements/2) {
|
|
spin_unlock_irq(&mdev->al_lock);
|
|
return NULL;
|
|
}
|
|
e = lc_get(mdev->resync, enr);
|
|
bm_ext = e ? lc_entry(e, struct bm_extent, lce) : NULL;
|
|
if (bm_ext) {
|
|
if (bm_ext->lce.lc_number != enr) {
|
|
bm_ext->rs_left = drbd_bm_e_weight(mdev, enr);
|
|
bm_ext->rs_failed = 0;
|
|
lc_changed(mdev->resync, &bm_ext->lce);
|
|
wakeup = 1;
|
|
}
|
|
if (bm_ext->lce.refcnt == 1)
|
|
mdev->resync_locked++;
|
|
set_bit(BME_NO_WRITES, &bm_ext->flags);
|
|
}
|
|
rs_flags = mdev->resync->flags;
|
|
spin_unlock_irq(&mdev->al_lock);
|
|
if (wakeup)
|
|
wake_up(&mdev->al_wait);
|
|
|
|
if (!bm_ext) {
|
|
if (rs_flags & LC_STARVING)
|
|
dev_warn(DEV, "Have to wait for element"
|
|
" (resync LRU too small?)\n");
|
|
BUG_ON(rs_flags & LC_DIRTY);
|
|
}
|
|
|
|
return bm_ext;
|
|
}
|
|
|
|
static int _is_in_al(struct drbd_conf *mdev, unsigned int enr)
|
|
{
|
|
struct lc_element *al_ext;
|
|
int rv = 0;
|
|
|
|
spin_lock_irq(&mdev->al_lock);
|
|
if (unlikely(enr == mdev->act_log->new_number))
|
|
rv = 1;
|
|
else {
|
|
al_ext = lc_find(mdev->act_log, enr);
|
|
if (al_ext) {
|
|
if (al_ext->refcnt)
|
|
rv = 1;
|
|
}
|
|
}
|
|
spin_unlock_irq(&mdev->al_lock);
|
|
|
|
/*
|
|
if (unlikely(rv)) {
|
|
dev_info(DEV, "Delaying sync read until app's write is done\n");
|
|
}
|
|
*/
|
|
return rv;
|
|
}
|
|
|
|
/**
|
|
* drbd_rs_begin_io() - Gets an extent in the resync LRU cache and sets it to BME_LOCKED
|
|
* @mdev: DRBD device.
|
|
* @sector: The sector number.
|
|
*
|
|
* This functions sleeps on al_wait. Returns 0 on success, -EINTR if interrupted.
|
|
*/
|
|
int drbd_rs_begin_io(struct drbd_conf *mdev, sector_t sector)
|
|
{
|
|
unsigned int enr = BM_SECT_TO_EXT(sector);
|
|
struct bm_extent *bm_ext;
|
|
int i, sig;
|
|
int sa = 200; /* Step aside 200 times, then grab the extent and let app-IO wait.
|
|
200 times -> 20 seconds. */
|
|
|
|
retry:
|
|
sig = wait_event_interruptible(mdev->al_wait,
|
|
(bm_ext = _bme_get(mdev, enr)));
|
|
if (sig)
|
|
return -EINTR;
|
|
|
|
if (test_bit(BME_LOCKED, &bm_ext->flags))
|
|
return 0;
|
|
|
|
for (i = 0; i < AL_EXT_PER_BM_SECT; i++) {
|
|
sig = wait_event_interruptible(mdev->al_wait,
|
|
!_is_in_al(mdev, enr * AL_EXT_PER_BM_SECT + i) ||
|
|
test_bit(BME_PRIORITY, &bm_ext->flags));
|
|
|
|
if (sig || (test_bit(BME_PRIORITY, &bm_ext->flags) && sa)) {
|
|
spin_lock_irq(&mdev->al_lock);
|
|
if (lc_put(mdev->resync, &bm_ext->lce) == 0) {
|
|
bm_ext->flags = 0; /* clears BME_NO_WRITES and eventually BME_PRIORITY */
|
|
mdev->resync_locked--;
|
|
wake_up(&mdev->al_wait);
|
|
}
|
|
spin_unlock_irq(&mdev->al_lock);
|
|
if (sig)
|
|
return -EINTR;
|
|
if (schedule_timeout_interruptible(HZ/10))
|
|
return -EINTR;
|
|
if (sa && --sa == 0)
|
|
dev_warn(DEV,"drbd_rs_begin_io() stepped aside for 20sec."
|
|
"Resync stalled?\n");
|
|
goto retry;
|
|
}
|
|
}
|
|
set_bit(BME_LOCKED, &bm_ext->flags);
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* drbd_try_rs_begin_io() - Gets an extent in the resync LRU cache, does not sleep
|
|
* @mdev: DRBD device.
|
|
* @sector: The sector number.
|
|
*
|
|
* Gets an extent in the resync LRU cache, sets it to BME_NO_WRITES, then
|
|
* tries to set it to BME_LOCKED. Returns 0 upon success, and -EAGAIN
|
|
* if there is still application IO going on in this area.
|
|
*/
|
|
int drbd_try_rs_begin_io(struct drbd_conf *mdev, sector_t sector)
|
|
{
|
|
unsigned int enr = BM_SECT_TO_EXT(sector);
|
|
const unsigned int al_enr = enr*AL_EXT_PER_BM_SECT;
|
|
struct lc_element *e;
|
|
struct bm_extent *bm_ext;
|
|
int i;
|
|
|
|
spin_lock_irq(&mdev->al_lock);
|
|
if (mdev->resync_wenr != LC_FREE && mdev->resync_wenr != enr) {
|
|
/* in case you have very heavy scattered io, it may
|
|
* stall the syncer undefined if we give up the ref count
|
|
* when we try again and requeue.
|
|
*
|
|
* if we don't give up the refcount, but the next time
|
|
* we are scheduled this extent has been "synced" by new
|
|
* application writes, we'd miss the lc_put on the
|
|
* extent we keep the refcount on.
|
|
* so we remembered which extent we had to try again, and
|
|
* if the next requested one is something else, we do
|
|
* the lc_put here...
|
|
* we also have to wake_up
|
|
*/
|
|
e = lc_find(mdev->resync, mdev->resync_wenr);
|
|
bm_ext = e ? lc_entry(e, struct bm_extent, lce) : NULL;
|
|
if (bm_ext) {
|
|
D_ASSERT(!test_bit(BME_LOCKED, &bm_ext->flags));
|
|
D_ASSERT(test_bit(BME_NO_WRITES, &bm_ext->flags));
|
|
clear_bit(BME_NO_WRITES, &bm_ext->flags);
|
|
mdev->resync_wenr = LC_FREE;
|
|
if (lc_put(mdev->resync, &bm_ext->lce) == 0)
|
|
mdev->resync_locked--;
|
|
wake_up(&mdev->al_wait);
|
|
} else {
|
|
dev_alert(DEV, "LOGIC BUG\n");
|
|
}
|
|
}
|
|
/* TRY. */
|
|
e = lc_try_get(mdev->resync, enr);
|
|
bm_ext = e ? lc_entry(e, struct bm_extent, lce) : NULL;
|
|
if (bm_ext) {
|
|
if (test_bit(BME_LOCKED, &bm_ext->flags))
|
|
goto proceed;
|
|
if (!test_and_set_bit(BME_NO_WRITES, &bm_ext->flags)) {
|
|
mdev->resync_locked++;
|
|
} else {
|
|
/* we did set the BME_NO_WRITES,
|
|
* but then could not set BME_LOCKED,
|
|
* so we tried again.
|
|
* drop the extra reference. */
|
|
bm_ext->lce.refcnt--;
|
|
D_ASSERT(bm_ext->lce.refcnt > 0);
|
|
}
|
|
goto check_al;
|
|
} else {
|
|
/* do we rather want to try later? */
|
|
if (mdev->resync_locked > mdev->resync->nr_elements-3)
|
|
goto try_again;
|
|
/* Do or do not. There is no try. -- Yoda */
|
|
e = lc_get(mdev->resync, enr);
|
|
bm_ext = e ? lc_entry(e, struct bm_extent, lce) : NULL;
|
|
if (!bm_ext) {
|
|
const unsigned long rs_flags = mdev->resync->flags;
|
|
if (rs_flags & LC_STARVING)
|
|
dev_warn(DEV, "Have to wait for element"
|
|
" (resync LRU too small?)\n");
|
|
BUG_ON(rs_flags & LC_DIRTY);
|
|
goto try_again;
|
|
}
|
|
if (bm_ext->lce.lc_number != enr) {
|
|
bm_ext->rs_left = drbd_bm_e_weight(mdev, enr);
|
|
bm_ext->rs_failed = 0;
|
|
lc_changed(mdev->resync, &bm_ext->lce);
|
|
wake_up(&mdev->al_wait);
|
|
D_ASSERT(test_bit(BME_LOCKED, &bm_ext->flags) == 0);
|
|
}
|
|
set_bit(BME_NO_WRITES, &bm_ext->flags);
|
|
D_ASSERT(bm_ext->lce.refcnt == 1);
|
|
mdev->resync_locked++;
|
|
goto check_al;
|
|
}
|
|
check_al:
|
|
for (i = 0; i < AL_EXT_PER_BM_SECT; i++) {
|
|
if (unlikely(al_enr+i == mdev->act_log->new_number))
|
|
goto try_again;
|
|
if (lc_is_used(mdev->act_log, al_enr+i))
|
|
goto try_again;
|
|
}
|
|
set_bit(BME_LOCKED, &bm_ext->flags);
|
|
proceed:
|
|
mdev->resync_wenr = LC_FREE;
|
|
spin_unlock_irq(&mdev->al_lock);
|
|
return 0;
|
|
|
|
try_again:
|
|
if (bm_ext)
|
|
mdev->resync_wenr = enr;
|
|
spin_unlock_irq(&mdev->al_lock);
|
|
return -EAGAIN;
|
|
}
|
|
|
|
void drbd_rs_complete_io(struct drbd_conf *mdev, sector_t sector)
|
|
{
|
|
unsigned int enr = BM_SECT_TO_EXT(sector);
|
|
struct lc_element *e;
|
|
struct bm_extent *bm_ext;
|
|
unsigned long flags;
|
|
|
|
spin_lock_irqsave(&mdev->al_lock, flags);
|
|
e = lc_find(mdev->resync, enr);
|
|
bm_ext = e ? lc_entry(e, struct bm_extent, lce) : NULL;
|
|
if (!bm_ext) {
|
|
spin_unlock_irqrestore(&mdev->al_lock, flags);
|
|
if (__ratelimit(&drbd_ratelimit_state))
|
|
dev_err(DEV, "drbd_rs_complete_io() called, but extent not found\n");
|
|
return;
|
|
}
|
|
|
|
if (bm_ext->lce.refcnt == 0) {
|
|
spin_unlock_irqrestore(&mdev->al_lock, flags);
|
|
dev_err(DEV, "drbd_rs_complete_io(,%llu [=%u]) called, "
|
|
"but refcnt is 0!?\n",
|
|
(unsigned long long)sector, enr);
|
|
return;
|
|
}
|
|
|
|
if (lc_put(mdev->resync, &bm_ext->lce) == 0) {
|
|
bm_ext->flags = 0; /* clear BME_LOCKED, BME_NO_WRITES and BME_PRIORITY */
|
|
mdev->resync_locked--;
|
|
wake_up(&mdev->al_wait);
|
|
}
|
|
|
|
spin_unlock_irqrestore(&mdev->al_lock, flags);
|
|
}
|
|
|
|
/**
|
|
* drbd_rs_cancel_all() - Removes all extents from the resync LRU (even BME_LOCKED)
|
|
* @mdev: DRBD device.
|
|
*/
|
|
void drbd_rs_cancel_all(struct drbd_conf *mdev)
|
|
{
|
|
spin_lock_irq(&mdev->al_lock);
|
|
|
|
if (get_ldev_if_state(mdev, D_FAILED)) { /* Makes sure ->resync is there. */
|
|
lc_reset(mdev->resync);
|
|
put_ldev(mdev);
|
|
}
|
|
mdev->resync_locked = 0;
|
|
mdev->resync_wenr = LC_FREE;
|
|
spin_unlock_irq(&mdev->al_lock);
|
|
wake_up(&mdev->al_wait);
|
|
}
|
|
|
|
/**
|
|
* drbd_rs_del_all() - Gracefully remove all extents from the resync LRU
|
|
* @mdev: DRBD device.
|
|
*
|
|
* Returns 0 upon success, -EAGAIN if at least one reference count was
|
|
* not zero.
|
|
*/
|
|
int drbd_rs_del_all(struct drbd_conf *mdev)
|
|
{
|
|
struct lc_element *e;
|
|
struct bm_extent *bm_ext;
|
|
int i;
|
|
|
|
spin_lock_irq(&mdev->al_lock);
|
|
|
|
if (get_ldev_if_state(mdev, D_FAILED)) {
|
|
/* ok, ->resync is there. */
|
|
for (i = 0; i < mdev->resync->nr_elements; i++) {
|
|
e = lc_element_by_index(mdev->resync, i);
|
|
bm_ext = lc_entry(e, struct bm_extent, lce);
|
|
if (bm_ext->lce.lc_number == LC_FREE)
|
|
continue;
|
|
if (bm_ext->lce.lc_number == mdev->resync_wenr) {
|
|
dev_info(DEV, "dropping %u in drbd_rs_del_all, apparently"
|
|
" got 'synced' by application io\n",
|
|
mdev->resync_wenr);
|
|
D_ASSERT(!test_bit(BME_LOCKED, &bm_ext->flags));
|
|
D_ASSERT(test_bit(BME_NO_WRITES, &bm_ext->flags));
|
|
clear_bit(BME_NO_WRITES, &bm_ext->flags);
|
|
mdev->resync_wenr = LC_FREE;
|
|
lc_put(mdev->resync, &bm_ext->lce);
|
|
}
|
|
if (bm_ext->lce.refcnt != 0) {
|
|
dev_info(DEV, "Retrying drbd_rs_del_all() later. "
|
|
"refcnt=%d\n", bm_ext->lce.refcnt);
|
|
put_ldev(mdev);
|
|
spin_unlock_irq(&mdev->al_lock);
|
|
return -EAGAIN;
|
|
}
|
|
D_ASSERT(!test_bit(BME_LOCKED, &bm_ext->flags));
|
|
D_ASSERT(!test_bit(BME_NO_WRITES, &bm_ext->flags));
|
|
lc_del(mdev->resync, &bm_ext->lce);
|
|
}
|
|
D_ASSERT(mdev->resync->used == 0);
|
|
put_ldev(mdev);
|
|
}
|
|
spin_unlock_irq(&mdev->al_lock);
|
|
|
|
return 0;
|
|
}
|
|
|
|
/**
|
|
* drbd_rs_failed_io() - Record information on a failure to resync the specified blocks
|
|
* @mdev: DRBD device.
|
|
* @sector: The sector number.
|
|
* @size: Size of failed IO operation, in byte.
|
|
*/
|
|
void drbd_rs_failed_io(struct drbd_conf *mdev, sector_t sector, int size)
|
|
{
|
|
/* Is called from worker and receiver context _only_ */
|
|
unsigned long sbnr, ebnr, lbnr;
|
|
unsigned long count;
|
|
sector_t esector, nr_sectors;
|
|
int wake_up = 0;
|
|
|
|
if (size <= 0 || (size & 0x1ff) != 0 || size > DRBD_MAX_BIO_SIZE) {
|
|
dev_err(DEV, "drbd_rs_failed_io: sector=%llus size=%d nonsense!\n",
|
|
(unsigned long long)sector, size);
|
|
return;
|
|
}
|
|
nr_sectors = drbd_get_capacity(mdev->this_bdev);
|
|
esector = sector + (size >> 9) - 1;
|
|
|
|
if (!expect(sector < nr_sectors))
|
|
return;
|
|
if (!expect(esector < nr_sectors))
|
|
esector = nr_sectors - 1;
|
|
|
|
lbnr = BM_SECT_TO_BIT(nr_sectors-1);
|
|
|
|
/*
|
|
* round up start sector, round down end sector. we make sure we only
|
|
* handle full, aligned, BM_BLOCK_SIZE (4K) blocks */
|
|
if (unlikely(esector < BM_SECT_PER_BIT-1))
|
|
return;
|
|
if (unlikely(esector == (nr_sectors-1)))
|
|
ebnr = lbnr;
|
|
else
|
|
ebnr = BM_SECT_TO_BIT(esector - (BM_SECT_PER_BIT-1));
|
|
sbnr = BM_SECT_TO_BIT(sector + BM_SECT_PER_BIT-1);
|
|
|
|
if (sbnr > ebnr)
|
|
return;
|
|
|
|
/*
|
|
* ok, (capacity & 7) != 0 sometimes, but who cares...
|
|
* we count rs_{total,left} in bits, not sectors.
|
|
*/
|
|
spin_lock_irq(&mdev->al_lock);
|
|
count = drbd_bm_count_bits(mdev, sbnr, ebnr);
|
|
if (count) {
|
|
mdev->rs_failed += count;
|
|
|
|
if (get_ldev(mdev)) {
|
|
drbd_try_clear_on_disk_bm(mdev, sector, count, false);
|
|
put_ldev(mdev);
|
|
}
|
|
|
|
/* just wake_up unconditional now, various lc_chaged(),
|
|
* lc_put() in drbd_try_clear_on_disk_bm(). */
|
|
wake_up = 1;
|
|
}
|
|
spin_unlock_irq(&mdev->al_lock);
|
|
if (wake_up)
|
|
wake_up(&mdev->al_wait);
|
|
}
|