[Drbd-dev] [PATCH 07/15] drbd: RCU for disk_conf
Philipp Reisner
philipp.reisner at linbit.com
Thu Oct 6 15:37:52 CEST 2011
Signed-off-by: Philipp Reisner <philipp.reisner at linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg at linbit.com>
---
drivers/block/drbd/drbd_int.h | 54 +++++++++++---
drivers/block/drbd/drbd_main.c | 25 ++++--
drivers/block/drbd/drbd_nl.c | 144 ++++++++++++++++++++++++------------
drivers/block/drbd/drbd_receiver.c | 138 ++++++++++++++++++++++------------
drivers/block/drbd/drbd_state.c | 16 +++-
drivers/block/drbd/drbd_worker.c | 38 +++++++---
6 files changed, 282 insertions(+), 133 deletions(-)
diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h
index f8d0ac3..cd77dd4 100644
--- a/drivers/block/drbd/drbd_int.h
+++ b/drivers/block/drbd/drbd_int.h
@@ -777,7 +777,7 @@ struct drbd_backing_dev {
struct block_device *backing_bdev;
struct block_device *md_bdev;
struct drbd_md md;
- struct disk_conf dc; /* The user provided config... */
+ struct disk_conf *disk_conf; /* RCU, for updates: mdev->tconn->conf_update */
sector_t known_size; /* last known size of that backing device */
};
@@ -1644,8 +1644,13 @@ static inline union drbd_state drbd_read_state(struct drbd_conf *mdev)
#define __drbd_chk_io_error(m,f) __drbd_chk_io_error_(m,f, __func__)
static inline void __drbd_chk_io_error_(struct drbd_conf *mdev, int forcedetach, const char *where)
{
- switch (mdev->ldev->dc.on_io_error) {
- case EP_PASS_ON:
+ enum drbd_io_error_p ep;
+
+ rcu_read_lock();
+ ep = rcu_dereference(mdev->ldev->disk_conf)->on_io_error;
+ rcu_read_unlock();
+ switch (ep) {
+ case EP_PASS_ON: /* FIXME would this be better named "Ignore"? */
if (!forcedetach) {
if (__ratelimit(&drbd_ratelimit_state))
dev_err(DEV, "Local IO failed in %s.\n", where);
@@ -1694,9 +1699,9 @@ static inline void drbd_chk_io_error_(struct drbd_conf *mdev,
* BTW, for internal meta data, this happens to be the maximum capacity
* we could agree upon with our peer node.
*/
-static inline sector_t drbd_md_first_sector(struct drbd_backing_dev *bdev)
+static inline sector_t _drbd_md_first_sector(int meta_dev_idx, struct drbd_backing_dev *bdev)
{
- switch (bdev->dc.meta_dev_idx) {
+ switch (meta_dev_idx) {
case DRBD_MD_INDEX_INTERNAL:
case DRBD_MD_INDEX_FLEX_INT:
return bdev->md.md_offset + bdev->md.bm_offset;
@@ -1706,13 +1711,30 @@ static inline sector_t drbd_md_first_sector(struct drbd_backing_dev *bdev)
}
}
+static inline sector_t drbd_md_first_sector(struct drbd_backing_dev *bdev)
+{
+ int meta_dev_idx;
+
+ rcu_read_lock();
+ meta_dev_idx = rcu_dereference(bdev->disk_conf)->meta_dev_idx;
+ rcu_read_unlock();
+
+ return _drbd_md_first_sector(meta_dev_idx, bdev);
+}
+
/**
* drbd_md_last_sector() - Return the last sector number of the meta data area
* @bdev: Meta data block device.
*/
static inline sector_t drbd_md_last_sector(struct drbd_backing_dev *bdev)
{
- switch (bdev->dc.meta_dev_idx) {
+ int meta_dev_idx;
+
+ rcu_read_lock();
+ meta_dev_idx = rcu_dereference(bdev->disk_conf)->meta_dev_idx;
+ rcu_read_unlock();
+
+ switch (meta_dev_idx) {
case DRBD_MD_INDEX_INTERNAL:
case DRBD_MD_INDEX_FLEX_INT:
return bdev->md.md_offset + MD_AL_OFFSET - 1;
@@ -1740,12 +1762,18 @@ static inline sector_t drbd_get_capacity(struct block_device *bdev)
static inline sector_t drbd_get_max_capacity(struct drbd_backing_dev *bdev)
{
sector_t s;
- switch (bdev->dc.meta_dev_idx) {
+ int meta_dev_idx;
+
+ rcu_read_lock();
+ meta_dev_idx = rcu_dereference(bdev->disk_conf)->meta_dev_idx;
+ rcu_read_unlock();
+
+ switch (meta_dev_idx) {
case DRBD_MD_INDEX_INTERNAL:
case DRBD_MD_INDEX_FLEX_INT:
s = drbd_get_capacity(bdev->backing_bdev)
? min_t(sector_t, DRBD_MAX_SECTORS_FLEX,
- drbd_md_first_sector(bdev))
+ _drbd_md_first_sector(meta_dev_idx, bdev))
: 0;
break;
case DRBD_MD_INDEX_FLEX_EXT:
@@ -1771,9 +1799,15 @@ static inline sector_t drbd_get_max_capacity(struct drbd_backing_dev *bdev)
static inline sector_t drbd_md_ss__(struct drbd_conf *mdev,
struct drbd_backing_dev *bdev)
{
- switch (bdev->dc.meta_dev_idx) {
+ int meta_dev_idx;
+
+ rcu_read_lock();
+ meta_dev_idx = rcu_dereference(bdev->disk_conf)->meta_dev_idx;
+ rcu_read_unlock();
+
+ switch (meta_dev_idx) {
default: /* external, some index */
- return MD_RESERVED_SECT * bdev->dc.meta_dev_idx;
+ return MD_RESERVED_SECT * meta_dev_idx;
case DRBD_MD_INDEX_INTERNAL:
/* with drbd08, internal meta data is always "flexible" */
case DRBD_MD_INDEX_FLEX_INT:
diff --git a/drivers/block/drbd/drbd_main.c b/drivers/block/drbd/drbd_main.c
index 352c36f..32ebedb 100644
--- a/drivers/block/drbd/drbd_main.c
+++ b/drivers/block/drbd/drbd_main.c
@@ -866,6 +866,7 @@ int drbd_send_sync_param(struct drbd_conf *mdev)
const int apv = mdev->tconn->agreed_pro_version;
enum drbd_packet cmd;
struct net_conf *nc;
+ struct disk_conf *dc;
sock = &mdev->tconn->data;
p = drbd_prepare_command(mdev, sock);
@@ -887,11 +888,12 @@ int drbd_send_sync_param(struct drbd_conf *mdev)
memset(p->verify_alg, 0, 2 * SHARED_SECRET_MAX);
if (get_ldev(mdev)) {
- p->rate = cpu_to_be32(mdev->ldev->dc.resync_rate);
- p->c_plan_ahead = cpu_to_be32(mdev->ldev->dc.c_plan_ahead);
- p->c_delay_target = cpu_to_be32(mdev->ldev->dc.c_delay_target);
- p->c_fill_target = cpu_to_be32(mdev->ldev->dc.c_fill_target);
- p->c_max_rate = cpu_to_be32(mdev->ldev->dc.c_max_rate);
+ dc = rcu_dereference(mdev->ldev->disk_conf);
+ p->rate = cpu_to_be32(dc->resync_rate);
+ p->c_plan_ahead = cpu_to_be32(dc->c_plan_ahead);
+ p->c_delay_target = cpu_to_be32(dc->c_delay_target);
+ p->c_fill_target = cpu_to_be32(dc->c_fill_target);
+ p->c_max_rate = cpu_to_be32(dc->c_max_rate);
put_ldev(mdev);
} else {
p->rate = cpu_to_be32(DRBD_RATE_DEF);
@@ -1056,7 +1058,9 @@ int drbd_send_sizes(struct drbd_conf *mdev, int trigger_reply, enum dds_flags fl
if (get_ldev_if_state(mdev, D_NEGOTIATING)) {
D_ASSERT(mdev->ldev->backing_bdev);
d_size = drbd_get_max_capacity(mdev->ldev);
- u_size = mdev->ldev->dc.disk_size;
+ rcu_read_lock();
+ u_size = rcu_dereference(mdev->ldev->disk_conf)->disk_size;
+ rcu_read_unlock();
q_order_type = drbd_queue_order_type(mdev);
max_bio_size = queue_max_hw_sectors(mdev->ldev->backing_bdev->bd_disk->queue) << 9;
max_bio_size = min_t(int, max_bio_size, DRBD_MAX_BIO_SIZE);
@@ -2889,7 +2893,6 @@ int drbd_md_read(struct drbd_conf *mdev, struct drbd_backing_dev *bdev)
for (i = UI_CURRENT; i < UI_SIZE; i++)
bdev->md.uuid[i] = be64_to_cpu(buffer->uuid[i]);
bdev->md.flags = be32_to_cpu(buffer->flags);
- bdev->dc.al_extents = be32_to_cpu(buffer->al_nr_extents);
bdev->md.device_uuid = be64_to_cpu(buffer->device_uuid);
spin_lock_irq(&mdev->tconn->req_lock);
@@ -2901,8 +2904,12 @@ int drbd_md_read(struct drbd_conf *mdev, struct drbd_backing_dev *bdev)
}
spin_unlock_irq(&mdev->tconn->req_lock);
- if (bdev->dc.al_extents < 7)
- bdev->dc.al_extents = 127;
+ mutex_lock(&mdev->tconn->conf_update);
+ /* This blocks wants to be get removed... */
+ bdev->disk_conf->al_extents = be32_to_cpu(buffer->al_nr_extents);
+ if (bdev->disk_conf->al_extents < DRBD_AL_EXTENTS_MIN)
+ bdev->disk_conf->al_extents = DRBD_AL_EXTENTS_DEF;
+ mutex_unlock(&mdev->tconn->conf_update);
err:
mutex_unlock(&mdev->md_io_mutex);
diff --git a/drivers/block/drbd/drbd_nl.c b/drivers/block/drbd/drbd_nl.c
index 84b055f..a7d4c0e 100644
--- a/drivers/block/drbd/drbd_nl.c
+++ b/drivers/block/drbd/drbd_nl.c
@@ -419,7 +419,8 @@ static enum drbd_fencing_p highest_fencing_policy(struct drbd_tconn *tconn)
rcu_read_lock();
idr_for_each_entry(&tconn->volumes, mdev, vnr) {
if (get_ldev_if_state(mdev, D_CONSISTENT)) {
- fp = max_t(enum drbd_fencing_p, fp, mdev->ldev->dc.fencing);
+ fp = max_t(enum drbd_fencing_p, fp,
+ rcu_dereference(mdev->ldev->disk_conf)->fencing);
put_ldev(mdev);
}
}
@@ -700,7 +701,12 @@ static void drbd_md_set_sector_offsets(struct drbd_conf *mdev,
struct drbd_backing_dev *bdev)
{
sector_t md_size_sect = 0;
- switch (bdev->dc.meta_dev_idx) {
+ int meta_dev_idx;
+
+ rcu_read_lock();
+ meta_dev_idx = rcu_dereference(bdev->disk_conf)->meta_dev_idx;
+
+ switch (meta_dev_idx) {
default:
/* v07 style fixed size indexed meta data */
bdev->md.md_size_sect = MD_RESERVED_SECT;
@@ -735,6 +741,7 @@ static void drbd_md_set_sector_offsets(struct drbd_conf *mdev,
bdev->md.bm_offset = -md_size_sect + MD_AL_OFFSET;
break;
}
+ rcu_read_unlock();
}
/* input size is expected to be in KB */
@@ -825,7 +832,9 @@ enum determine_dev_size drbd_determine_dev_size(struct drbd_conf *mdev, enum dds
/* TODO: should only be some assert here, not (re)init... */
drbd_md_set_sector_offsets(mdev, mdev->ldev);
- u_size = mdev->ldev->dc.disk_size;
+ rcu_read_lock();
+ u_size = rcu_dereference(mdev->ldev->disk_conf)->disk_size;
+ rcu_read_unlock();
size = drbd_new_dev_size(mdev, mdev->ldev, u_size, flags & DDSF_FORCED);
if (drbd_get_capacity(mdev->this_bdev) != size ||
@@ -1001,7 +1010,9 @@ static void drbd_setup_queue_param(struct drbd_conf *mdev, unsigned int max_bio_
struct request_queue * const b = mdev->ldev->backing_bdev->bd_disk->queue;
max_hw_sectors = min(queue_max_hw_sectors(b), max_bio_size >> 9);
- max_segments = mdev->ldev->dc.max_bio_bvecs;
+ rcu_read_lock();
+ max_segments = rcu_dereference(mdev->ldev->disk_conf)->max_bio_bvecs;
+ rcu_read_unlock();
put_ldev(mdev);
}
@@ -1117,7 +1128,7 @@ int drbd_adm_disk_opts(struct sk_buff *skb, struct genl_info *info)
{
enum drbd_ret_code retcode;
struct drbd_conf *mdev;
- struct disk_conf *new_disk_conf;
+ struct disk_conf *new_disk_conf, *old_disk_conf;
int err, fifo_size;
int *rs_plan_s = NULL;
@@ -1150,19 +1161,15 @@ int drbd_adm_disk_opts(struct sk_buff *skb, struct genl_info *info)
goto out;
}
-/* FIXME freeze IO, cluster wide.
- *
- * We should make sure no-one uses
- * some half-updated struct when we
- * assign it later. */
-
- new_disk_conf = kmalloc(sizeof(*new_disk_conf), GFP_KERNEL);
+ new_disk_conf = kmalloc(sizeof(struct disk_conf), GFP_KERNEL);
if (!new_disk_conf) {
retcode = ERR_NOMEM;
goto fail;
}
- memcpy(new_disk_conf, &mdev->ldev->dc, sizeof(*new_disk_conf));
+ mutex_lock(&mdev->tconn->conf_update);
+ old_disk_conf = mdev->ldev->disk_conf;
+ *new_disk_conf = *old_disk_conf;
if (should_set_defaults(info))
set_disk_conf_defaults(new_disk_conf);
@@ -1187,7 +1194,7 @@ int drbd_adm_disk_opts(struct sk_buff *skb, struct genl_info *info)
if (!rs_plan_s) {
dev_err(DEV, "kmalloc of fifo_buffer failed");
retcode = ERR_NOMEM;
- goto fail;
+ goto fail_unlock;
}
}
@@ -1207,31 +1214,37 @@ int drbd_adm_disk_opts(struct sk_buff *skb, struct genl_info *info)
if (err) {
retcode = ERR_NOMEM;
- goto fail;
+ goto fail_unlock;
}
- /* FIXME
- * To avoid someone looking at a half-updated struct, we probably
- * should have a rw-semaphor on net_conf and disk_conf.
- */
write_lock_irq(&global_state_lock);
retcode = drbd_sync_after_valid(mdev, new_disk_conf->resync_after);
if (retcode == NO_ERROR) {
- mdev->ldev->dc = *new_disk_conf;
+ rcu_assign_pointer(mdev->ldev->disk_conf, new_disk_conf);
drbd_sync_after_changed(mdev);
}
write_unlock_irq(&global_state_lock);
- drbd_md_sync(mdev);
+ if (retcode != NO_ERROR)
+ goto fail_unlock;
+ drbd_md_sync(mdev);
if (mdev->state.conn >= C_CONNECTED)
drbd_send_sync_param(mdev);
+ mutex_unlock(&mdev->tconn->conf_update);
+ synchronize_rcu();
+ kfree(old_disk_conf);
+ goto success;
+
+fail_unlock:
+ mutex_unlock(&mdev->tconn->conf_update);
fail:
- put_ldev(mdev);
kfree(new_disk_conf);
kfree(rs_plan_s);
+success:
+ put_ldev(mdev);
out:
drbd_adm_finish(info, retcode);
return 0;
@@ -1246,6 +1259,7 @@ int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info)
sector_t max_possible_sectors;
sector_t min_md_device_sectors;
struct drbd_backing_dev *nbc = NULL; /* new_backing_conf */
+ struct disk_conf *new_disk_conf = NULL;
struct block_device *bdev;
struct lru_cache *resync_lru = NULL;
union drbd_state ns, os;
@@ -1279,17 +1293,22 @@ int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info)
retcode = ERR_NOMEM;
goto fail;
}
+ new_disk_conf = kzalloc(sizeof(struct disk_conf), GFP_KERNEL);
+ if (!new_disk_conf) {
+ retcode = ERR_NOMEM;
+ goto fail;
+ }
+ nbc->disk_conf = new_disk_conf;
- set_disk_conf_defaults(&nbc->dc);
-
- err = disk_conf_from_attrs(&nbc->dc, info);
+ set_disk_conf_defaults(new_disk_conf);
+ err = disk_conf_from_attrs(new_disk_conf, info);
if (err) {
retcode = ERR_MANDATORY_TAG;
drbd_msg_put_info(from_attrs_err_to_txt(err));
goto fail;
}
- if (nbc->dc.meta_dev_idx < DRBD_MD_INDEX_FLEX_INT) {
+ if (new_disk_conf->meta_dev_idx < DRBD_MD_INDEX_FLEX_INT) {
retcode = ERR_MD_IDX_INVALID;
goto fail;
}
@@ -1297,7 +1316,7 @@ int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info)
rcu_read_lock();
nc = rcu_dereference(mdev->tconn->net_conf);
if (nc) {
- if (nbc->dc.fencing == FP_STONITH && nc->wire_protocol == DRBD_PROT_A) {
+ if (new_disk_conf->fencing == FP_STONITH && nc->wire_protocol == DRBD_PROT_A) {
rcu_read_unlock();
retcode = ERR_STONITH_AND_PROT_A;
goto fail;
@@ -1305,10 +1324,10 @@ int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info)
}
rcu_read_unlock();
- bdev = blkdev_get_by_path(nbc->dc.backing_dev,
+ bdev = blkdev_get_by_path(new_disk_conf->backing_dev,
FMODE_READ | FMODE_WRITE | FMODE_EXCL, mdev);
if (IS_ERR(bdev)) {
- dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.backing_dev,
+ dev_err(DEV, "open(\"%s\") failed with %ld\n", new_disk_conf->backing_dev,
PTR_ERR(bdev));
retcode = ERR_OPEN_DISK;
goto fail;
@@ -1323,12 +1342,12 @@ int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info)
* should check it for you already; but if you don't, or
* someone fooled it, we need to double check here)
*/
- bdev = blkdev_get_by_path(nbc->dc.meta_dev,
+ bdev = blkdev_get_by_path(new_disk_conf->meta_dev,
FMODE_READ | FMODE_WRITE | FMODE_EXCL,
- (nbc->dc.meta_dev_idx < 0) ?
+ (new_disk_conf->meta_dev_idx < 0) ?
(void *)mdev : (void *)drbd_m_holder);
if (IS_ERR(bdev)) {
- dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.meta_dev,
+ dev_err(DEV, "open(\"%s\") failed with %ld\n", new_disk_conf->meta_dev,
PTR_ERR(bdev));
retcode = ERR_OPEN_MD_DISK;
goto fail;
@@ -1336,8 +1355,8 @@ int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info)
nbc->md_bdev = bdev;
if ((nbc->backing_bdev == nbc->md_bdev) !=
- (nbc->dc.meta_dev_idx == DRBD_MD_INDEX_INTERNAL ||
- nbc->dc.meta_dev_idx == DRBD_MD_INDEX_FLEX_INT)) {
+ (new_disk_conf->meta_dev_idx == DRBD_MD_INDEX_INTERNAL ||
+ new_disk_conf->meta_dev_idx == DRBD_MD_INDEX_FLEX_INT)) {
retcode = ERR_MD_IDX_INVALID;
goto fail;
}
@@ -1353,21 +1372,21 @@ int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info)
/* RT - for drbd_get_max_capacity() DRBD_MD_INDEX_FLEX_INT */
drbd_md_set_sector_offsets(mdev, nbc);
- if (drbd_get_max_capacity(nbc) < nbc->dc.disk_size) {
+ if (drbd_get_max_capacity(nbc) < new_disk_conf->disk_size) {
dev_err(DEV, "max capacity %llu smaller than disk size %llu\n",
(unsigned long long) drbd_get_max_capacity(nbc),
- (unsigned long long) nbc->dc.disk_size);
+ (unsigned long long) new_disk_conf->disk_size);
retcode = ERR_DISK_TO_SMALL;
goto fail;
}
- if (nbc->dc.meta_dev_idx < 0) {
+ if (new_disk_conf->meta_dev_idx < 0) {
max_possible_sectors = DRBD_MAX_SECTORS_FLEX;
/* at least one MB, otherwise it does not make sense */
min_md_device_sectors = (2<<10);
} else {
max_possible_sectors = DRBD_MAX_SECTORS;
- min_md_device_sectors = MD_RESERVED_SECT * (nbc->dc.meta_dev_idx + 1);
+ min_md_device_sectors = MD_RESERVED_SECT * (new_disk_conf->meta_dev_idx + 1);
}
if (drbd_get_capacity(nbc->md_bdev) < min_md_device_sectors) {
@@ -1392,7 +1411,7 @@ int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info)
dev_warn(DEV, "==> truncating very big lower level device "
"to currently maximum possible %llu sectors <==\n",
(unsigned long long) max_possible_sectors);
- if (nbc->dc.meta_dev_idx >= 0)
+ if (new_disk_conf->meta_dev_idx >= 0)
dev_warn(DEV, "==>> using internal or flexible "
"meta data may help <<==\n");
}
@@ -1435,14 +1454,14 @@ int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info)
}
/* Since we are diskless, fix the activity log first... */
- if (drbd_check_al_size(mdev, &nbc->dc)) {
+ if (drbd_check_al_size(mdev, new_disk_conf)) {
retcode = ERR_NOMEM;
goto force_diskless_dec;
}
/* Prevent shrinking of consistent devices ! */
if (drbd_md_test_flag(nbc, MDF_CONSISTENT) &&
- drbd_new_dev_size(mdev, nbc, nbc->dc.disk_size, 0) < nbc->md.la_size_sect) {
+ drbd_new_dev_size(mdev, nbc, nbc->disk_conf->disk_size, 0) < nbc->md.la_size_sect) {
dev_warn(DEV, "refusing to truncate a consistent device\n");
retcode = ERR_DISK_TO_SMALL;
goto force_diskless_dec;
@@ -1455,11 +1474,13 @@ int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info)
/* Reset the "barriers don't work" bits here, then force meta data to
* be written, to ensure we determine if barriers are supported. */
- if (nbc->dc.no_md_flush)
+ if (new_disk_conf->no_md_flush)
set_bit(MD_NO_FUA, &mdev->flags);
else
clear_bit(MD_NO_FUA, &mdev->flags);
+ /* FIXME Missing stuff: rs_plan_s, clip al range */
+
/* Point of no return reached.
* Devices and memory are no longer released by error cleanup below.
* now mdev takes over responsibility, and the state engine should
@@ -1469,6 +1490,7 @@ int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info)
mdev->resync = resync_lru;
nbc = NULL;
resync_lru = NULL;
+ new_disk_conf = NULL;
mdev->write_ordering = WO_bdev_flush;
drbd_bump_write_ordering(mdev, WO_bdev_flush);
@@ -1566,9 +1588,11 @@ int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info)
if (drbd_md_test_flag(mdev->ldev, MDF_PEER_OUT_DATED))
ns.pdsk = D_OUTDATED;
- if ( ns.disk == D_CONSISTENT &&
- (ns.pdsk == D_OUTDATED || mdev->ldev->dc.fencing == FP_DONT_CARE))
+ rcu_read_lock();
+ if (ns.disk == D_CONSISTENT &&
+ (ns.pdsk == D_OUTDATED || rcu_dereference(mdev->ldev->disk_conf)->fencing == FP_DONT_CARE))
ns.disk = D_UP_TO_DATE;
+ rcu_read_unlock();
/* All tests on MDF_PRIMARY_IND, MDF_CONNECTED_IND,
MDF_CONSISTENT and MDF_WAS_UP_TO_DATE must happen before
@@ -1625,6 +1649,7 @@ int drbd_adm_attach(struct sk_buff *skb, struct genl_info *info)
FMODE_READ | FMODE_WRITE | FMODE_EXCL);
kfree(nbc);
}
+ kfree(new_disk_conf);
lc_destroy(resync_lru);
finish:
@@ -1727,7 +1752,7 @@ _check_net_options(struct drbd_tconn *tconn, struct net_conf *old_conf, struct n
idr_for_each_entry(&tconn->volumes, mdev, i) {
if (get_ldev(mdev)) {
- enum drbd_fencing_p fp = mdev->ldev->dc.fencing;
+ enum drbd_fencing_p fp = rcu_dereference(mdev->ldev->disk_conf)->fencing;
put_ldev(mdev);
if (new_conf->wire_protocol == DRBD_PROT_A && fp == FP_STONITH)
return ERR_STONITH_AND_PROT_A;
@@ -2204,11 +2229,13 @@ void resync_after_online_grow(struct drbd_conf *mdev)
int drbd_adm_resize(struct sk_buff *skb, struct genl_info *info)
{
+ struct disk_conf *old_disk_conf, *new_disk_conf = NULL;
struct resize_parms rs;
struct drbd_conf *mdev;
enum drbd_ret_code retcode;
enum determine_dev_size dd;
enum dds_flags ddsf;
+ sector_t u_size;
int err;
retcode = drbd_adm_prepare(skb, info, DRBD_ADM_NEED_MINOR);
@@ -2249,10 +2276,31 @@ int drbd_adm_resize(struct sk_buff *skb, struct genl_info *info)
goto fail;
}
+ rcu_read_lock();
+ u_size = rcu_dereference(mdev->ldev->disk_conf)->disk_size;
+ rcu_read_unlock();
+ if (u_size != (sector_t)rs.resize_size) {
+ new_disk_conf = kmalloc(sizeof(struct disk_conf), GFP_KERNEL);
+ if (!new_disk_conf) {
+ retcode = ERR_NOMEM;
+ goto fail;
+ }
+ }
+
if (mdev->ldev->known_size != drbd_get_capacity(mdev->ldev->backing_bdev))
mdev->ldev->known_size = drbd_get_capacity(mdev->ldev->backing_bdev);
- mdev->ldev->dc.disk_size = (sector_t)rs.resize_size;
+ if (new_disk_conf) {
+ mutex_lock(&mdev->tconn->conf_update);
+ old_disk_conf = mdev->ldev->disk_conf;
+ *new_disk_conf = *old_disk_conf;
+ new_disk_conf->disk_size = (sector_t)rs.resize_size;
+ rcu_assign_pointer(mdev->ldev->disk_conf, new_disk_conf);
+ mutex_unlock(&mdev->tconn->conf_update);
+ synchronize_rcu();
+ kfree(old_disk_conf);
+ }
+
ddsf = (rs.resize_force ? DDSF_FORCED : 0) | (rs.no_resync ? DDSF_NO_RESYNC : 0);
dd = drbd_determine_dev_size(mdev, ddsf);
drbd_md_sync(mdev);
@@ -2546,11 +2594,11 @@ int nla_put_status_info(struct sk_buff *skb, struct drbd_conf *mdev,
if (res_opts_to_skb(skb, &mdev->tconn->res_opts, exclude_sensitive))
goto nla_put_failure;
+ rcu_read_lock();
if (got_ldev)
- if (disk_conf_to_skb(skb, &mdev->ldev->dc, exclude_sensitive))
+ if (disk_conf_to_skb(skb, rcu_dereference(mdev->ldev->disk_conf), exclude_sensitive))
goto nla_put_failure;
- rcu_read_lock();
nc = rcu_dereference(mdev->tconn->net_conf);
if (nc)
err = net_conf_to_skb(skb, nc, exclude_sensitive);
diff --git a/drivers/block/drbd/drbd_receiver.c b/drivers/block/drbd/drbd_receiver.c
index bba0050..add4176 100644
--- a/drivers/block/drbd/drbd_receiver.c
+++ b/drivers/block/drbd/drbd_receiver.c
@@ -1166,6 +1166,7 @@ static enum finish_epoch drbd_may_finish_epoch(struct drbd_conf *mdev,
*/
void drbd_bump_write_ordering(struct drbd_conf *mdev, enum write_ordering_e wo) __must_hold(local)
{
+ struct disk_conf *dc;
enum write_ordering_e pwo;
static char *write_ordering_str[] = {
[WO_none] = "none",
@@ -1175,10 +1176,14 @@ void drbd_bump_write_ordering(struct drbd_conf *mdev, enum write_ordering_e wo)
pwo = mdev->write_ordering;
wo = min(pwo, wo);
- if (wo == WO_bdev_flush && mdev->ldev->dc.no_disk_flush)
+ rcu_read_lock();
+ dc = rcu_dereference(mdev->ldev->disk_conf);
+
+ if (wo == WO_bdev_flush && dc->no_disk_flush)
wo = WO_drain_io;
- if (wo == WO_drain_io && mdev->ldev->dc.no_disk_drain)
+ if (wo == WO_drain_io && dc->no_disk_drain)
wo = WO_none;
+ rcu_read_unlock();
mdev->write_ordering = wo;
if (pwo != mdev->write_ordering || wo == WO_bdev_flush)
dev_info(DEV, "Method to ensure write ordering: %s\n", write_ordering_str[mdev->write_ordering]);
@@ -2190,9 +2195,14 @@ int drbd_rs_should_slow_down(struct drbd_conf *mdev, sector_t sector)
struct lc_element *tmp;
int curr_events;
int throttle = 0;
+ unsigned int c_min_rate;
+
+ rcu_read_lock();
+ c_min_rate = rcu_dereference(mdev->ldev->disk_conf)->c_min_rate;
+ rcu_read_unlock();
/* feature disabled? */
- if (mdev->ldev->dc.c_min_rate == 0)
+ if (c_min_rate == 0)
return 0;
spin_lock_irq(&mdev->al_lock);
@@ -2232,7 +2242,7 @@ int drbd_rs_should_slow_down(struct drbd_conf *mdev, sector_t sector)
db = mdev->rs_mark_left[i] - rs_left;
dbdt = Bit2KB(db/dt);
- if (dbdt > mdev->ldev->dc.c_min_rate)
+ if (dbdt > c_min_rate)
throttle = 1;
}
return throttle;
@@ -3147,6 +3157,7 @@ static int receive_SyncParam(struct drbd_tconn *tconn, struct packet_info *pi)
struct crypto_hash *verify_tfm = NULL;
struct crypto_hash *csums_tfm = NULL;
struct net_conf *old_net_conf, *new_net_conf = NULL;
+ struct disk_conf *old_disk_conf, *new_disk_conf = NULL;
const int apv = tconn->agreed_pro_version;
int *rs_plan_s = NULL;
int fifo_size = 0;
@@ -3189,24 +3200,34 @@ static int receive_SyncParam(struct drbd_tconn *tconn, struct packet_info *pi)
if (err)
return err;
- if (get_ldev(mdev)) {
- mdev->ldev->dc.resync_rate = be32_to_cpu(p->rate);
- put_ldev(mdev);
+ new_disk_conf = kzalloc(sizeof(struct disk_conf), GFP_KERNEL);
+ if (!new_disk_conf) {
+ dev_err(DEV, "Allocation of new disk_conf failed\n");
+ return -ENOMEM;
}
+ mutex_lock(&mdev->tconn->conf_update);
+ old_net_conf = mdev->tconn->net_conf;
+ old_disk_conf = mdev->ldev->disk_conf;
+ *new_disk_conf = *old_disk_conf;
+
+ new_disk_conf->resync_rate = be32_to_cpu(p->rate);
+
if (apv >= 88) {
if (apv == 88) {
if (data_size > SHARED_SECRET_MAX) {
dev_err(DEV, "verify-alg too long, "
"peer wants %u, accepting only %u byte\n",
data_size, SHARED_SECRET_MAX);
+ mutex_unlock(&mdev->tconn->conf_update);
return -EIO;
}
err = drbd_recv_all(mdev->tconn, p->verify_alg, data_size);
- if (err)
+ if (err) {
+ mutex_unlock(&mdev->tconn->conf_update);
return err;
-
+ }
/* we expect NUL terminated string */
/* but just in case someone tries to be evil */
D_ASSERT(p->verify_alg[data_size-1] == 0);
@@ -3221,9 +3242,6 @@ static int receive_SyncParam(struct drbd_tconn *tconn, struct packet_info *pi)
p->csums_alg[SHARED_SECRET_MAX-1] = 0;
}
- mutex_lock(&mdev->tconn->conf_update);
- old_net_conf = mdev->tconn->net_conf;
-
if (strcmp(old_net_conf->verify_alg, p->verify_alg)) {
if (mdev->state.conn == C_WF_REPORT_PARAMS) {
dev_err(DEV, "Different verify-alg settings. me=\"%s\" peer=\"%s\"\n",
@@ -3252,14 +3270,13 @@ static int receive_SyncParam(struct drbd_tconn *tconn, struct packet_info *pi)
}
}
- if (apv > 94 && get_ldev(mdev)) {
- mdev->ldev->dc.resync_rate = be32_to_cpu(p->rate);
- mdev->ldev->dc.c_plan_ahead = be32_to_cpu(p->c_plan_ahead);
- mdev->ldev->dc.c_delay_target = be32_to_cpu(p->c_delay_target);
- mdev->ldev->dc.c_fill_target = be32_to_cpu(p->c_fill_target);
- mdev->ldev->dc.c_max_rate = be32_to_cpu(p->c_max_rate);
+ if (apv > 94) {
+ new_disk_conf->c_plan_ahead = be32_to_cpu(p->c_plan_ahead);
+ new_disk_conf->c_delay_target = be32_to_cpu(p->c_delay_target);
+ new_disk_conf->c_fill_target = be32_to_cpu(p->c_fill_target);
+ new_disk_conf->c_max_rate = be32_to_cpu(p->c_max_rate);
- fifo_size = (mdev->ldev->dc.c_plan_ahead * 10 * SLEEP_TIME) / HZ;
+ fifo_size = (new_disk_conf->c_plan_ahead * 10 * SLEEP_TIME) / HZ;
if (fifo_size != mdev->rs_plan_s.size && fifo_size > 0) {
rs_plan_s = kzalloc(sizeof(int) * fifo_size, GFP_KERNEL);
if (!rs_plan_s) {
@@ -3268,7 +3285,6 @@ static int receive_SyncParam(struct drbd_tconn *tconn, struct packet_info *pi)
goto disconnect;
}
}
- put_ldev(mdev);
}
if (verify_tfm || csums_tfm) {
@@ -3296,21 +3312,24 @@ static int receive_SyncParam(struct drbd_tconn *tconn, struct packet_info *pi)
}
rcu_assign_pointer(tconn->net_conf, new_net_conf);
}
- mutex_unlock(&mdev->tconn->conf_update);
- if (new_net_conf) {
- synchronize_rcu();
- kfree(old_net_conf);
- }
+ }
- spin_lock(&mdev->peer_seq_lock);
- if (fifo_size != mdev->rs_plan_s.size) {
- kfree(mdev->rs_plan_s.values);
- mdev->rs_plan_s.values = rs_plan_s;
- mdev->rs_plan_s.size = fifo_size;
- mdev->rs_planed = 0;
- }
- spin_unlock(&mdev->peer_seq_lock);
+ rcu_assign_pointer(mdev->ldev->disk_conf, new_disk_conf);
+ spin_lock(&mdev->peer_seq_lock);
+ if (rs_plan_s) {
+ kfree(mdev->rs_plan_s.values);
+ mdev->rs_plan_s.values = rs_plan_s;
+ mdev->rs_plan_s.size = fifo_size;
+ mdev->rs_planed = 0;
}
+ spin_unlock(&mdev->peer_seq_lock);
+
+ mutex_unlock(&mdev->tconn->conf_update);
+ synchronize_rcu();
+ if (new_net_conf)
+ kfree(old_net_conf);
+ kfree(old_disk_conf);
+
return 0;
disconnect:
@@ -3358,37 +3377,56 @@ static int receive_sizes(struct drbd_tconn *tconn, struct packet_info *pi)
mdev->p_size = p_size;
if (get_ldev(mdev)) {
+ rcu_read_lock();
+ my_usize = rcu_dereference(mdev->ldev->disk_conf)->disk_size;
+ rcu_read_unlock();
+
warn_if_differ_considerably(mdev, "lower level device sizes",
p_size, drbd_get_max_capacity(mdev->ldev));
warn_if_differ_considerably(mdev, "user requested size",
- p_usize, mdev->ldev->dc.disk_size);
+ p_usize, my_usize);
/* if this is the first connect, or an otherwise expected
* param exchange, choose the minimum */
if (mdev->state.conn == C_WF_REPORT_PARAMS)
- p_usize = min_not_zero((sector_t)mdev->ldev->dc.disk_size,
- p_usize);
-
- my_usize = mdev->ldev->dc.disk_size;
-
- if (mdev->ldev->dc.disk_size != p_usize) {
- mdev->ldev->dc.disk_size = p_usize;
- dev_info(DEV, "Peer sets u_size to %lu sectors\n",
- (unsigned long)mdev->ldev->dc.disk_size);
- }
+ p_usize = min_not_zero(my_usize, p_usize);
/* Never shrink a device with usable data during connect.
But allow online shrinking if we are connected. */
if (drbd_new_dev_size(mdev, mdev->ldev, p_usize, 0) <
- drbd_get_capacity(mdev->this_bdev) &&
- mdev->state.disk >= D_OUTDATED &&
- mdev->state.conn < C_CONNECTED) {
+ drbd_get_capacity(mdev->this_bdev) &&
+ mdev->state.disk >= D_OUTDATED &&
+ mdev->state.conn < C_CONNECTED) {
dev_err(DEV, "The peer's disk size is too small!\n");
conn_request_state(mdev->tconn, NS(conn, C_DISCONNECTING), CS_HARD);
- mdev->ldev->dc.disk_size = my_usize;
put_ldev(mdev);
return -EIO;
}
+
+ if (my_usize != p_usize) {
+ struct disk_conf *old_disk_conf, *new_disk_conf = NULL;
+
+ new_disk_conf = kzalloc(sizeof(struct disk_conf), GFP_KERNEL);
+ if (!new_disk_conf) {
+ dev_err(DEV, "Allocation of new disk_conf failed\n");
+ put_ldev(mdev);
+ return -ENOMEM;
+ }
+
+ mutex_lock(&mdev->tconn->conf_update);
+ old_disk_conf = mdev->ldev->disk_conf;
+ *new_disk_conf = *old_disk_conf;
+ new_disk_conf->disk_size = p_usize;
+
+ rcu_assign_pointer(mdev->ldev->disk_conf, new_disk_conf);
+ mutex_unlock(&mdev->tconn->conf_update);
+ synchronize_rcu();
+ kfree(old_disk_conf);
+
+ dev_info(DEV, "Peer sets u_size to %lu sectors\n",
+ (unsigned long)my_usize);
+ }
+
put_ldev(mdev);
}
@@ -4268,7 +4306,9 @@ static int drbd_disconnected(int vnr, void *p, void *data)
fp = FP_DONT_CARE;
if (get_ldev(mdev)) {
- fp = mdev->ldev->dc.fencing;
+ rcu_read_lock();
+ fp = rcu_dereference(mdev->ldev->disk_conf)->fencing;
+ rcu_read_unlock();
put_ldev(mdev);
}
diff --git a/drivers/block/drbd/drbd_state.c b/drivers/block/drbd/drbd_state.c
index befaf07..3f65365 100644
--- a/drivers/block/drbd/drbd_state.c
+++ b/drivers/block/drbd/drbd_state.c
@@ -465,13 +465,13 @@ is_valid_state(struct drbd_conf *mdev, union drbd_state ns)
enum drbd_state_rv rv = SS_SUCCESS;
struct net_conf *nc;
+ rcu_read_lock();
fp = FP_DONT_CARE;
if (get_ldev(mdev)) {
- fp = mdev->ldev->dc.fencing;
+ fp = rcu_dereference(mdev->ldev->disk_conf)->fencing;
put_ldev(mdev);
}
- rcu_read_lock();
nc = rcu_dereference(mdev->tconn->net_conf);
if (nc) {
if (!nc->two_primaries && ns.role == R_PRIMARY) {
@@ -656,7 +656,9 @@ static union drbd_state sanitize_state(struct drbd_conf *mdev, union drbd_state
fp = FP_DONT_CARE;
if (get_ldev(mdev)) {
- fp = mdev->ldev->dc.fencing;
+ rcu_read_lock();
+ fp = rcu_dereference(mdev->ldev->disk_conf)->fencing;
+ rcu_read_unlock();
put_ldev(mdev);
}
@@ -1114,7 +1116,9 @@ static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
fp = FP_DONT_CARE;
if (get_ldev(mdev)) {
- fp = mdev->ldev->dc.fencing;
+ rcu_read_lock();
+ fp = rcu_dereference(mdev->ldev->disk_conf)->fencing;
+ rcu_read_unlock();
put_ldev(mdev);
}
@@ -1269,7 +1273,9 @@ static void after_state_ch(struct drbd_conf *mdev, union drbd_state os,
/* corresponding get_ldev was in __drbd_set_state, to serialize
* our cleanup here with the transition to D_DISKLESS,
* so it is safe to dreference ldev here. */
- eh = mdev->ldev->dc.on_io_error;
+ rcu_read_lock();
+ eh = rcu_dereference(mdev->ldev->disk_conf)->on_io_error;
+ rcu_read_unlock();
was_io_error = test_and_clear_bit(WAS_IO_ERROR, &mdev->flags);
/* current state still has to be D_FAILED,
diff --git a/drivers/block/drbd/drbd_worker.c b/drivers/block/drbd/drbd_worker.c
index f8fdf75..840e787 100644
--- a/drivers/block/drbd/drbd_worker.c
+++ b/drivers/block/drbd/drbd_worker.c
@@ -436,6 +436,7 @@ static void fifo_add_val(struct fifo_buffer *fb, int value)
static int drbd_rs_controller(struct drbd_conf *mdev)
{
+ struct disk_conf *dc;
unsigned int sect_in; /* Number of sectors that came in since the last turn */
unsigned int want; /* The number of sectors we want in the proxy */
int req_sect; /* Number of sectors to request in this turn */
@@ -449,14 +450,16 @@ static int drbd_rs_controller(struct drbd_conf *mdev)
mdev->rs_in_flight -= sect_in;
spin_lock(&mdev->peer_seq_lock); /* get an atomic view on mdev->rs_plan_s */
+ rcu_read_lock();
+ dc = rcu_dereference(mdev->ldev->disk_conf);
- steps = mdev->rs_plan_s.size; /* (mdev->ldev->dc.c_plan_ahead * 10 * SLEEP_TIME) / HZ; */
+ steps = mdev->rs_plan_s.size; /* (dc->c_plan_ahead * 10 * SLEEP_TIME) / HZ; */
if (mdev->rs_in_flight + sect_in == 0) { /* At start of resync */
- want = ((mdev->ldev->dc.resync_rate * 2 * SLEEP_TIME) / HZ) * steps;
+ want = ((dc->resync_rate * 2 * SLEEP_TIME) / HZ) * steps;
} else { /* normal path */
- want = mdev->ldev->dc.c_fill_target ? mdev->ldev->dc.c_fill_target :
- sect_in * mdev->ldev->dc.c_delay_target * HZ / (SLEEP_TIME * 10);
+ want = dc->c_fill_target ? dc->c_fill_target :
+ sect_in * dc->c_delay_target * HZ / (SLEEP_TIME * 10);
}
correction = want - mdev->rs_in_flight - mdev->rs_planed;
@@ -468,14 +471,13 @@ static int drbd_rs_controller(struct drbd_conf *mdev)
/* What we do in this step */
curr_corr = fifo_push(&mdev->rs_plan_s, 0);
- spin_unlock(&mdev->peer_seq_lock);
mdev->rs_planed -= curr_corr;
req_sect = sect_in + curr_corr;
if (req_sect < 0)
req_sect = 0;
- max_sect = (mdev->ldev->dc.c_max_rate * 2 * SLEEP_TIME) / HZ;
+ max_sect = (dc->c_max_rate * 2 * SLEEP_TIME) / HZ;
if (req_sect > max_sect)
req_sect = max_sect;
@@ -484,6 +486,8 @@ static int drbd_rs_controller(struct drbd_conf *mdev)
sect_in, mdev->rs_in_flight, want, correction,
steps, cps, mdev->rs_planed, curr_corr, req_sect);
*/
+ rcu_read_unlock();
+ spin_unlock(&mdev->peer_seq_lock);
return req_sect;
}
@@ -491,11 +495,13 @@ static int drbd_rs_controller(struct drbd_conf *mdev)
static int drbd_rs_number_requests(struct drbd_conf *mdev)
{
int number;
- if (mdev->rs_plan_s.size) { /* mdev->ldev->dc.c_plan_ahead */
+ if (mdev->rs_plan_s.size) { /* rcu_dereference(mdev->ldev->disk_conf)->c_plan_ahead */
number = drbd_rs_controller(mdev) >> (BM_BLOCK_SHIFT - 9);
mdev->c_sync_rate = number * HZ * (BM_BLOCK_SIZE / 1024) / SLEEP_TIME;
} else {
- mdev->c_sync_rate = mdev->ldev->dc.resync_rate;
+ rcu_read_lock();
+ mdev->c_sync_rate = rcu_dereference(mdev->ldev->disk_conf)->resync_rate;
+ rcu_read_unlock();
number = SLEEP_TIME * mdev->c_sync_rate / ((BM_BLOCK_SIZE / 1024) * HZ);
}
@@ -1320,13 +1326,17 @@ int w_restart_disk_io(struct drbd_work *w, int cancel)
static int _drbd_may_sync_now(struct drbd_conf *mdev)
{
struct drbd_conf *odev = mdev;
+ int ra;
while (1) {
if (!odev->ldev)
return 1;
- if (odev->ldev->dc.resync_after == -1)
+ rcu_read_lock();
+ ra = rcu_dereference(odev->ldev->disk_conf)->resync_after;
+ rcu_read_unlock();
+ if (ra == -1)
return 1;
- odev = minor_to_mdev(odev->ldev->dc.resync_after);
+ odev = minor_to_mdev(ra);
if (!expect(odev))
return 1;
if ((odev->state.conn >= C_SYNC_SOURCE &&
@@ -1405,6 +1415,7 @@ void suspend_other_sg(struct drbd_conf *mdev)
enum drbd_ret_code drbd_sync_after_valid(struct drbd_conf *mdev, int o_minor)
{
struct drbd_conf *odev;
+ int ra;
if (o_minor == -1)
return NO_ERROR;
@@ -1417,12 +1428,15 @@ enum drbd_ret_code drbd_sync_after_valid(struct drbd_conf *mdev, int o_minor)
if (odev == mdev)
return ERR_SYNC_AFTER_CYCLE;
+ rcu_read_lock();
+ ra = rcu_dereference(odev->ldev->disk_conf)->resync_after;
+ rcu_read_unlock();
/* dependency chain ends here, no cycles. */
- if (odev->ldev->dc.resync_after == -1)
+ if (ra == -1)
return NO_ERROR;
/* follow the dependency chain */
- odev = minor_to_mdev(odev->ldev->dc.resync_after);
+ odev = minor_to_mdev(ra);
}
}
--
1.7.4.1
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