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kernel-fxtec-pro1x/drivers/block/drbd/drbd_nl.c
Lars Ellenberg e7f52dfb4f drbd: revert "delay probes", feature is being re-implemented differently 
It was a now abandoned attempt to throttle resync bandwidth
based on the delay it causes on the bulk data socket.
It has no userbase yet, and has been disabled by
9173465ccb51c09cc3102a10af93e9f469a0af6f already.
This removes the now unused code.

The basic feature, namely using up "idle" bandwith
of network and disk IO subsystem, with minimal impact
to application IO, is being reimplemented differently.

Signed-off-by: Philipp Reisner <philipp.reisner@linbit.com>
Signed-off-by: Lars Ellenberg <lars.ellenberg@linbit.com>
Signed-off-by: Jens Axboe <jaxboe@fusionio.com>
2010-08-07 18:53:57 +02:00

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/*
drbd_nl.c
This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
Copyright (C) 2001-2008, LINBIT Information Technologies GmbH.
Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>.
Copyright (C) 2002-2008, 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/module.h>
#include <linux/drbd.h>
#include <linux/in.h>
#include <linux/fs.h>
#include <linux/file.h>
#include <linux/slab.h>
#include <linux/connector.h>
#include <linux/blkpg.h>
#include <linux/cpumask.h>
#include "drbd_int.h"
#include "drbd_wrappers.h"
#include <asm/unaligned.h>
#include <linux/drbd_tag_magic.h>
#include <linux/drbd_limits.h>
static unsigned short *tl_add_blob(unsigned short *, enum drbd_tags, const void *, int);
static unsigned short *tl_add_str(unsigned short *, enum drbd_tags, const char *);
static unsigned short *tl_add_int(unsigned short *, enum drbd_tags, const void *);
/* see get_sb_bdev and bd_claim */
static char *drbd_m_holder = "Hands off! this is DRBD's meta data device.";
/* Generate the tag_list to struct functions */
#define NL_PACKET(name, number, fields) \
static int name ## _from_tags(struct drbd_conf *mdev, \
unsigned short *tags, struct name *arg) __attribute__ ((unused)); \
static int name ## _from_tags(struct drbd_conf *mdev, \
unsigned short *tags, struct name *arg) \
{ \
int tag; \
int dlen; \
\
while ((tag = get_unaligned(tags++)) != TT_END) { \
dlen = get_unaligned(tags++); \
switch (tag_number(tag)) { \
fields \
default: \
if (tag & T_MANDATORY) { \
dev_err(DEV, "Unknown tag: %d\n", tag_number(tag)); \
return 0; \
} \
} \
tags = (unsigned short *)((char *)tags + dlen); \
} \
return 1; \
}
#define NL_INTEGER(pn, pr, member) \
case pn: /* D_ASSERT( tag_type(tag) == TT_INTEGER ); */ \
arg->member = get_unaligned((int *)(tags)); \
break;
#define NL_INT64(pn, pr, member) \
case pn: /* D_ASSERT( tag_type(tag) == TT_INT64 ); */ \
arg->member = get_unaligned((u64 *)(tags)); \
break;
#define NL_BIT(pn, pr, member) \
case pn: /* D_ASSERT( tag_type(tag) == TT_BIT ); */ \
arg->member = *(char *)(tags) ? 1 : 0; \
break;
#define NL_STRING(pn, pr, member, len) \
case pn: /* D_ASSERT( tag_type(tag) == TT_STRING ); */ \
if (dlen > len) { \
dev_err(DEV, "arg too long: %s (%u wanted, max len: %u bytes)\n", \
#member, dlen, (unsigned int)len); \
return 0; \
} \
arg->member ## _len = dlen; \
memcpy(arg->member, tags, min_t(size_t, dlen, len)); \
break;
#include "linux/drbd_nl.h"
/* Generate the struct to tag_list functions */
#define NL_PACKET(name, number, fields) \
static unsigned short* \
name ## _to_tags(struct drbd_conf *mdev, \
struct name *arg, unsigned short *tags) __attribute__ ((unused)); \
static unsigned short* \
name ## _to_tags(struct drbd_conf *mdev, \
struct name *arg, unsigned short *tags) \
{ \
fields \
return tags; \
}
#define NL_INTEGER(pn, pr, member) \
put_unaligned(pn | pr | TT_INTEGER, tags++); \
put_unaligned(sizeof(int), tags++); \
put_unaligned(arg->member, (int *)tags); \
tags = (unsigned short *)((char *)tags+sizeof(int));
#define NL_INT64(pn, pr, member) \
put_unaligned(pn | pr | TT_INT64, tags++); \
put_unaligned(sizeof(u64), tags++); \
put_unaligned(arg->member, (u64 *)tags); \
tags = (unsigned short *)((char *)tags+sizeof(u64));
#define NL_BIT(pn, pr, member) \
put_unaligned(pn | pr | TT_BIT, tags++); \
put_unaligned(sizeof(char), tags++); \
*(char *)tags = arg->member; \
tags = (unsigned short *)((char *)tags+sizeof(char));
#define NL_STRING(pn, pr, member, len) \
put_unaligned(pn | pr | TT_STRING, tags++); \
put_unaligned(arg->member ## _len, tags++); \
memcpy(tags, arg->member, arg->member ## _len); \
tags = (unsigned short *)((char *)tags + arg->member ## _len);
#include "linux/drbd_nl.h"
void drbd_bcast_ev_helper(struct drbd_conf *mdev, char *helper_name);
void drbd_nl_send_reply(struct cn_msg *, int);
int drbd_khelper(struct drbd_conf *mdev, char *cmd)
{
char *envp[] = { "HOME=/",
"TERM=linux",
"PATH=/sbin:/usr/sbin:/bin:/usr/bin",
NULL, /* Will be set to address family */
NULL, /* Will be set to address */
NULL };
char mb[12], af[20], ad[60], *afs;
char *argv[] = {usermode_helper, cmd, mb, NULL };
int ret;
snprintf(mb, 12, "minor-%d", mdev_to_minor(mdev));
if (get_net_conf(mdev)) {
switch (((struct sockaddr *)mdev->net_conf->peer_addr)->sa_family) {
case AF_INET6:
afs = "ipv6";
snprintf(ad, 60, "DRBD_PEER_ADDRESS=%pI6",
&((struct sockaddr_in6 *)mdev->net_conf->peer_addr)->sin6_addr);
break;
case AF_INET:
afs = "ipv4";
snprintf(ad, 60, "DRBD_PEER_ADDRESS=%pI4",
&((struct sockaddr_in *)mdev->net_conf->peer_addr)->sin_addr);
break;
default:
afs = "ssocks";
snprintf(ad, 60, "DRBD_PEER_ADDRESS=%pI4",
&((struct sockaddr_in *)mdev->net_conf->peer_addr)->sin_addr);
}
snprintf(af, 20, "DRBD_PEER_AF=%s", afs);
envp[3]=af;
envp[4]=ad;
put_net_conf(mdev);
}
dev_info(DEV, "helper command: %s %s %s\n", usermode_helper, cmd, mb);
drbd_bcast_ev_helper(mdev, cmd);
ret = call_usermodehelper(usermode_helper, argv, envp, 1);
if (ret)
dev_warn(DEV, "helper command: %s %s %s exit code %u (0x%x)\n",
usermode_helper, cmd, mb,
(ret >> 8) & 0xff, ret);
else
dev_info(DEV, "helper command: %s %s %s exit code %u (0x%x)\n",
usermode_helper, cmd, mb,
(ret >> 8) & 0xff, ret);
if (ret < 0) /* Ignore any ERRNOs we got. */
ret = 0;
return ret;
}
enum drbd_disk_state drbd_try_outdate_peer(struct drbd_conf *mdev)
{
char *ex_to_string;
int r;
enum drbd_disk_state nps;
enum drbd_fencing_p fp;
D_ASSERT(mdev->state.pdsk == D_UNKNOWN);
if (get_ldev_if_state(mdev, D_CONSISTENT)) {
fp = mdev->ldev->dc.fencing;
put_ldev(mdev);
} else {
dev_warn(DEV, "Not fencing peer, I'm not even Consistent myself.\n");
return mdev->state.pdsk;
}
if (fp == FP_STONITH)
_drbd_request_state(mdev, NS(susp, 1), CS_WAIT_COMPLETE);
r = drbd_khelper(mdev, "fence-peer");
switch ((r>>8) & 0xff) {
case 3: /* peer is inconsistent */
ex_to_string = "peer is inconsistent or worse";
nps = D_INCONSISTENT;
break;
case 4: /* peer got outdated, or was already outdated */
ex_to_string = "peer was fenced";
nps = D_OUTDATED;
break;
case 5: /* peer was down */
if (mdev->state.disk == D_UP_TO_DATE) {
/* we will(have) create(d) a new UUID anyways... */
ex_to_string = "peer is unreachable, assumed to be dead";
nps = D_OUTDATED;
} else {
ex_to_string = "peer unreachable, doing nothing since disk != UpToDate";
nps = mdev->state.pdsk;
}
break;
case 6: /* Peer is primary, voluntarily outdate myself.
* This is useful when an unconnected R_SECONDARY is asked to
* become R_PRIMARY, but finds the other peer being active. */
ex_to_string = "peer is active";
dev_warn(DEV, "Peer is primary, outdating myself.\n");
nps = D_UNKNOWN;
_drbd_request_state(mdev, NS(disk, D_OUTDATED), CS_WAIT_COMPLETE);
break;
case 7:
if (fp != FP_STONITH)
dev_err(DEV, "fence-peer() = 7 && fencing != Stonith !!!\n");
ex_to_string = "peer was stonithed";
nps = D_OUTDATED;
break;
default:
/* The script is broken ... */
nps = D_UNKNOWN;
dev_err(DEV, "fence-peer helper broken, returned %d\n", (r>>8)&0xff);
return nps;
}
dev_info(DEV, "fence-peer helper returned %d (%s)\n",
(r>>8) & 0xff, ex_to_string);
return nps;
}
int drbd_set_role(struct drbd_conf *mdev, enum drbd_role new_role, int force)
{
const int max_tries = 4;
int r = 0;
int try = 0;
int forced = 0;
union drbd_state mask, val;
enum drbd_disk_state nps;
if (new_role == R_PRIMARY)
request_ping(mdev); /* Detect a dead peer ASAP */
mutex_lock(&mdev->state_mutex);
mask.i = 0; mask.role = R_MASK;
val.i = 0; val.role = new_role;
while (try++ < max_tries) {
r = _drbd_request_state(mdev, mask, val, CS_WAIT_COMPLETE);
/* in case we first succeeded to outdate,
* but now suddenly could establish a connection */
if (r == SS_CW_FAILED_BY_PEER && mask.pdsk != 0) {
val.pdsk = 0;
mask.pdsk = 0;
continue;
}
if (r == SS_NO_UP_TO_DATE_DISK && force &&
(mdev->state.disk < D_UP_TO_DATE &&
mdev->state.disk >= D_INCONSISTENT)) {
mask.disk = D_MASK;
val.disk = D_UP_TO_DATE;
forced = 1;
continue;
}
if (r == SS_NO_UP_TO_DATE_DISK &&
mdev->state.disk == D_CONSISTENT && mask.pdsk == 0) {
D_ASSERT(mdev->state.pdsk == D_UNKNOWN);
nps = drbd_try_outdate_peer(mdev);
if (nps == D_OUTDATED || nps == D_INCONSISTENT) {
val.disk = D_UP_TO_DATE;
mask.disk = D_MASK;
}
val.pdsk = nps;
mask.pdsk = D_MASK;
continue;
}
if (r == SS_NOTHING_TO_DO)
goto fail;
if (r == SS_PRIMARY_NOP && mask.pdsk == 0) {
nps = drbd_try_outdate_peer(mdev);
if (force && nps > D_OUTDATED) {
dev_warn(DEV, "Forced into split brain situation!\n");
nps = D_OUTDATED;
}
mask.pdsk = D_MASK;
val.pdsk = nps;
continue;
}
if (r == SS_TWO_PRIMARIES) {
/* Maybe the peer is detected as dead very soon...
retry at most once more in this case. */
__set_current_state(TASK_INTERRUPTIBLE);
schedule_timeout((mdev->net_conf->ping_timeo+1)*HZ/10);
if (try < max_tries)
try = max_tries - 1;
continue;
}
if (r < SS_SUCCESS) {
r = _drbd_request_state(mdev, mask, val,
CS_VERBOSE + CS_WAIT_COMPLETE);
if (r < SS_SUCCESS)
goto fail;
}
break;
}
if (r < SS_SUCCESS)
goto fail;
if (forced)
dev_warn(DEV, "Forced to consider local data as UpToDate!\n");
/* Wait until nothing is on the fly :) */
wait_event(mdev->misc_wait, atomic_read(&mdev->ap_pending_cnt) == 0);
if (new_role == R_SECONDARY) {
set_disk_ro(mdev->vdisk, TRUE);
if (get_ldev(mdev)) {
mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
put_ldev(mdev);
}
} else {
if (get_net_conf(mdev)) {
mdev->net_conf->want_lose = 0;
put_net_conf(mdev);
}
set_disk_ro(mdev->vdisk, FALSE);
if (get_ldev(mdev)) {
if (((mdev->state.conn < C_CONNECTED ||
mdev->state.pdsk <= D_FAILED)
&& mdev->ldev->md.uuid[UI_BITMAP] == 0) || forced)
drbd_uuid_new_current(mdev);
mdev->ldev->md.uuid[UI_CURRENT] |= (u64)1;
put_ldev(mdev);
}
}
if ((new_role == R_SECONDARY) && get_ldev(mdev)) {
drbd_al_to_on_disk_bm(mdev);
put_ldev(mdev);
}
if (mdev->state.conn >= C_WF_REPORT_PARAMS) {
/* if this was forced, we should consider sync */
if (forced)
drbd_send_uuids(mdev);
drbd_send_state(mdev);
}
drbd_md_sync(mdev);
kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
fail:
mutex_unlock(&mdev->state_mutex);
return r;
}
static int drbd_nl_primary(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
struct drbd_nl_cfg_reply *reply)
{
struct primary primary_args;
memset(&primary_args, 0, sizeof(struct primary));
if (!primary_from_tags(mdev, nlp->tag_list, &primary_args)) {
reply->ret_code = ERR_MANDATORY_TAG;
return 0;
}
reply->ret_code =
drbd_set_role(mdev, R_PRIMARY, primary_args.primary_force);
return 0;
}
static int drbd_nl_secondary(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
struct drbd_nl_cfg_reply *reply)
{
reply->ret_code = drbd_set_role(mdev, R_SECONDARY, 0);
return 0;
}
/* initializes the md.*_offset members, so we are able to find
* the on disk meta data */
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) {
default:
/* v07 style fixed size indexed meta data */
bdev->md.md_size_sect = MD_RESERVED_SECT;
bdev->md.md_offset = drbd_md_ss__(mdev, bdev);
bdev->md.al_offset = MD_AL_OFFSET;
bdev->md.bm_offset = MD_BM_OFFSET;
break;
case DRBD_MD_INDEX_FLEX_EXT:
/* just occupy the full device; unit: sectors */
bdev->md.md_size_sect = drbd_get_capacity(bdev->md_bdev);
bdev->md.md_offset = 0;
bdev->md.al_offset = MD_AL_OFFSET;
bdev->md.bm_offset = MD_BM_OFFSET;
break;
case DRBD_MD_INDEX_INTERNAL:
case DRBD_MD_INDEX_FLEX_INT:
bdev->md.md_offset = drbd_md_ss__(mdev, bdev);
/* al size is still fixed */
bdev->md.al_offset = -MD_AL_MAX_SIZE;
/* we need (slightly less than) ~ this much bitmap sectors: */
md_size_sect = drbd_get_capacity(bdev->backing_bdev);
md_size_sect = ALIGN(md_size_sect, BM_SECT_PER_EXT);
md_size_sect = BM_SECT_TO_EXT(md_size_sect);
md_size_sect = ALIGN(md_size_sect, 8);
/* plus the "drbd meta data super block",
* and the activity log; */
md_size_sect += MD_BM_OFFSET;
bdev->md.md_size_sect = md_size_sect;
/* bitmap offset is adjusted by 'super' block size */
bdev->md.bm_offset = -md_size_sect + MD_AL_OFFSET;
break;
}
}
char *ppsize(char *buf, unsigned long long size)
{
/* Needs 9 bytes at max. */
static char units[] = { 'K', 'M', 'G', 'T', 'P', 'E' };
int base = 0;
while (size >= 10000) {
/* shift + round */
size = (size >> 10) + !!(size & (1<<9));
base++;
}
sprintf(buf, "%lu %cB", (long)size, units[base]);
return buf;
}
/* there is still a theoretical deadlock when called from receiver
* on an D_INCONSISTENT R_PRIMARY:
* remote READ does inc_ap_bio, receiver would need to receive answer
* packet from remote to dec_ap_bio again.
* receiver receive_sizes(), comes here,
* waits for ap_bio_cnt == 0. -> deadlock.
* but this cannot happen, actually, because:
* R_PRIMARY D_INCONSISTENT, and peer's disk is unreachable
* (not connected, or bad/no disk on peer):
* see drbd_fail_request_early, ap_bio_cnt is zero.
* R_PRIMARY D_INCONSISTENT, and C_SYNC_TARGET:
* peer may not initiate a resize.
*/
void drbd_suspend_io(struct drbd_conf *mdev)
{
set_bit(SUSPEND_IO, &mdev->flags);
wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_bio_cnt));
}
void drbd_resume_io(struct drbd_conf *mdev)
{
clear_bit(SUSPEND_IO, &mdev->flags);
wake_up(&mdev->misc_wait);
}
/**
* drbd_determine_dev_size() - Sets the right device size obeying all constraints
* @mdev: DRBD device.
*
* Returns 0 on success, negative return values indicate errors.
* You should call drbd_md_sync() after calling this function.
*/
enum determine_dev_size drbd_determin_dev_size(struct drbd_conf *mdev, enum dds_flags flags) __must_hold(local)
{
sector_t prev_first_sect, prev_size; /* previous meta location */
sector_t la_size;
sector_t size;
char ppb[10];
int md_moved, la_size_changed;
enum determine_dev_size rv = unchanged;
/* race:
* application request passes inc_ap_bio,
* but then cannot get an AL-reference.
* this function later may wait on ap_bio_cnt == 0. -> deadlock.
*
* to avoid that:
* Suspend IO right here.
* still lock the act_log to not trigger ASSERTs there.
*/
drbd_suspend_io(mdev);
/* no wait necessary anymore, actually we could assert that */
wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
prev_first_sect = drbd_md_first_sector(mdev->ldev);
prev_size = mdev->ldev->md.md_size_sect;
la_size = mdev->ldev->md.la_size_sect;
/* TODO: should only be some assert here, not (re)init... */
drbd_md_set_sector_offsets(mdev, mdev->ldev);
size = drbd_new_dev_size(mdev, mdev->ldev, flags & DDSF_FORCED);
if (drbd_get_capacity(mdev->this_bdev) != size ||
drbd_bm_capacity(mdev) != size) {
int err;
err = drbd_bm_resize(mdev, size, !(flags & DDSF_NO_RESYNC));
if (unlikely(err)) {
/* currently there is only one error: ENOMEM! */
size = drbd_bm_capacity(mdev)>>1;
if (size == 0) {
dev_err(DEV, "OUT OF MEMORY! "
"Could not allocate bitmap!\n");
} else {
dev_err(DEV, "BM resizing failed. "
"Leaving size unchanged at size = %lu KB\n",
(unsigned long)size);
}
rv = dev_size_error;
}
/* racy, see comments above. */
drbd_set_my_capacity(mdev, size);
mdev->ldev->md.la_size_sect = size;
dev_info(DEV, "size = %s (%llu KB)\n", ppsize(ppb, size>>1),
(unsigned long long)size>>1);
}
if (rv == dev_size_error)
goto out;
la_size_changed = (la_size != mdev->ldev->md.la_size_sect);
md_moved = prev_first_sect != drbd_md_first_sector(mdev->ldev)
|| prev_size != mdev->ldev->md.md_size_sect;
if (la_size_changed || md_moved) {
drbd_al_shrink(mdev); /* All extents inactive. */
dev_info(DEV, "Writing the whole bitmap, %s\n",
la_size_changed && md_moved ? "size changed and md moved" :
la_size_changed ? "size changed" : "md moved");
rv = drbd_bitmap_io(mdev, &drbd_bm_write, "size changed"); /* does drbd_resume_io() ! */
drbd_md_mark_dirty(mdev);
}
if (size > la_size)
rv = grew;
if (size < la_size)
rv = shrunk;
out:
lc_unlock(mdev->act_log);
wake_up(&mdev->al_wait);
drbd_resume_io(mdev);
return rv;
}
sector_t
drbd_new_dev_size(struct drbd_conf *mdev, struct drbd_backing_dev *bdev, int assume_peer_has_space)
{
sector_t p_size = mdev->p_size; /* partner's disk size. */
sector_t la_size = bdev->md.la_size_sect; /* last agreed size. */
sector_t m_size; /* my size */
sector_t u_size = bdev->dc.disk_size; /* size requested by user. */
sector_t size = 0;
m_size = drbd_get_max_capacity(bdev);
if (mdev->state.conn < C_CONNECTED && assume_peer_has_space) {
dev_warn(DEV, "Resize while not connected was forced by the user!\n");
p_size = m_size;
}
if (p_size && m_size) {
size = min_t(sector_t, p_size, m_size);
} else {
if (la_size) {
size = la_size;
if (m_size && m_size < size)
size = m_size;
if (p_size && p_size < size)
size = p_size;
} else {
if (m_size)
size = m_size;
if (p_size)
size = p_size;
}
}
if (size == 0)
dev_err(DEV, "Both nodes diskless!\n");
if (u_size) {
if (u_size > size)
dev_err(DEV, "Requested disk size is too big (%lu > %lu)\n",
(unsigned long)u_size>>1, (unsigned long)size>>1);
else
size = u_size;
}
return size;
}
/**
* drbd_check_al_size() - Ensures that the AL is of the right size
* @mdev: DRBD device.
*
* Returns -EBUSY if current al lru is still used, -ENOMEM when allocation
* failed, and 0 on success. You should call drbd_md_sync() after you called
* this function.
*/
static int drbd_check_al_size(struct drbd_conf *mdev)
{
struct lru_cache *n, *t;
struct lc_element *e;
unsigned int in_use;
int i;
ERR_IF(mdev->sync_conf.al_extents < 7)
mdev->sync_conf.al_extents = 127;
if (mdev->act_log &&
mdev->act_log->nr_elements == mdev->sync_conf.al_extents)
return 0;
in_use = 0;
t = mdev->act_log;
n = lc_create("act_log", drbd_al_ext_cache,
mdev->sync_conf.al_extents, sizeof(struct lc_element), 0);
if (n == NULL) {
dev_err(DEV, "Cannot allocate act_log lru!\n");
return -ENOMEM;
}
spin_lock_irq(&mdev->al_lock);
if (t) {
for (i = 0; i < t->nr_elements; i++) {
e = lc_element_by_index(t, i);
if (e->refcnt)
dev_err(DEV, "refcnt(%d)==%d\n",
e->lc_number, e->refcnt);
in_use += e->refcnt;
}
}
if (!in_use)
mdev->act_log = n;
spin_unlock_irq(&mdev->al_lock);
if (in_use) {
dev_err(DEV, "Activity log still in use!\n");
lc_destroy(n);
return -EBUSY;
} else {
if (t)
lc_destroy(t);
}
drbd_md_mark_dirty(mdev); /* we changed mdev->act_log->nr_elemens */
return 0;
}
void drbd_setup_queue_param(struct drbd_conf *mdev, unsigned int max_seg_s) __must_hold(local)
{
struct request_queue * const q = mdev->rq_queue;
struct request_queue * const b = mdev->ldev->backing_bdev->bd_disk->queue;
int max_segments = mdev->ldev->dc.max_bio_bvecs;
max_seg_s = min(queue_max_sectors(b) * queue_logical_block_size(b), max_seg_s);
blk_queue_max_hw_sectors(q, max_seg_s >> 9);
blk_queue_max_segments(q, max_segments ? max_segments : BLK_MAX_SEGMENTS);
blk_queue_max_segment_size(q, max_seg_s);
blk_queue_logical_block_size(q, 512);
blk_queue_segment_boundary(q, PAGE_SIZE-1);
blk_stack_limits(&q->limits, &b->limits, 0);
if (b->merge_bvec_fn)
dev_warn(DEV, "Backing device's merge_bvec_fn() = %p\n",
b->merge_bvec_fn);
dev_info(DEV, "max_segment_size ( = BIO size ) = %u\n", queue_max_segment_size(q));
if (q->backing_dev_info.ra_pages != b->backing_dev_info.ra_pages) {
dev_info(DEV, "Adjusting my ra_pages to backing device's (%lu -> %lu)\n",
q->backing_dev_info.ra_pages,
b->backing_dev_info.ra_pages);
q->backing_dev_info.ra_pages = b->backing_dev_info.ra_pages;
}
}
/* serialize deconfig (worker exiting, doing cleanup)
* and reconfig (drbdsetup disk, drbdsetup net)
*
* wait for a potentially exiting worker, then restart it,
* or start a new one.
*/
static void drbd_reconfig_start(struct drbd_conf *mdev)
{
wait_event(mdev->state_wait, !test_and_set_bit(CONFIG_PENDING, &mdev->flags));
wait_event(mdev->state_wait, !test_bit(DEVICE_DYING, &mdev->flags));
drbd_thread_start(&mdev->worker);
}
/* if still unconfigured, stops worker again.
* if configured now, clears CONFIG_PENDING.
* wakes potential waiters */
static void drbd_reconfig_done(struct drbd_conf *mdev)
{
spin_lock_irq(&mdev->req_lock);
if (mdev->state.disk == D_DISKLESS &&
mdev->state.conn == C_STANDALONE &&
mdev->state.role == R_SECONDARY) {
set_bit(DEVICE_DYING, &mdev->flags);
drbd_thread_stop_nowait(&mdev->worker);
} else
clear_bit(CONFIG_PENDING, &mdev->flags);
spin_unlock_irq(&mdev->req_lock);
wake_up(&mdev->state_wait);
}
/* does always return 0;
* interesting return code is in reply->ret_code */
static int drbd_nl_disk_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
struct drbd_nl_cfg_reply *reply)
{
enum drbd_ret_codes retcode;
enum determine_dev_size dd;
sector_t max_possible_sectors;
sector_t min_md_device_sectors;
struct drbd_backing_dev *nbc = NULL; /* new_backing_conf */
struct inode *inode, *inode2;
struct lru_cache *resync_lru = NULL;
union drbd_state ns, os;
int rv;
int cp_discovered = 0;
int logical_block_size;
drbd_reconfig_start(mdev);
/* if you want to reconfigure, please tear down first */
if (mdev->state.disk > D_DISKLESS) {
retcode = ERR_DISK_CONFIGURED;
goto fail;
}
/* allocation not in the IO path, cqueue thread context */
nbc = kzalloc(sizeof(struct drbd_backing_dev), GFP_KERNEL);
if (!nbc) {
retcode = ERR_NOMEM;
goto fail;
}
nbc->dc.disk_size = DRBD_DISK_SIZE_SECT_DEF;
nbc->dc.on_io_error = DRBD_ON_IO_ERROR_DEF;
nbc->dc.fencing = DRBD_FENCING_DEF;
nbc->dc.max_bio_bvecs = DRBD_MAX_BIO_BVECS_DEF;
if (!disk_conf_from_tags(mdev, nlp->tag_list, &nbc->dc)) {
retcode = ERR_MANDATORY_TAG;
goto fail;
}
if (nbc->dc.meta_dev_idx < DRBD_MD_INDEX_FLEX_INT) {
retcode = ERR_MD_IDX_INVALID;
goto fail;
}
nbc->lo_file = filp_open(nbc->dc.backing_dev, O_RDWR, 0);
if (IS_ERR(nbc->lo_file)) {
dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.backing_dev,
PTR_ERR(nbc->lo_file));
nbc->lo_file = NULL;
retcode = ERR_OPEN_DISK;
goto fail;
}
inode = nbc->lo_file->f_dentry->d_inode;
if (!S_ISBLK(inode->i_mode)) {
retcode = ERR_DISK_NOT_BDEV;
goto fail;
}
nbc->md_file = filp_open(nbc->dc.meta_dev, O_RDWR, 0);
if (IS_ERR(nbc->md_file)) {
dev_err(DEV, "open(\"%s\") failed with %ld\n", nbc->dc.meta_dev,
PTR_ERR(nbc->md_file));
nbc->md_file = NULL;
retcode = ERR_OPEN_MD_DISK;
goto fail;
}
inode2 = nbc->md_file->f_dentry->d_inode;
if (!S_ISBLK(inode2->i_mode)) {
retcode = ERR_MD_NOT_BDEV;
goto fail;
}
nbc->backing_bdev = inode->i_bdev;
if (bd_claim(nbc->backing_bdev, mdev)) {
printk(KERN_ERR "drbd: bd_claim(%p,%p); failed [%p;%p;%u]\n",
nbc->backing_bdev, mdev,
nbc->backing_bdev->bd_holder,
nbc->backing_bdev->bd_contains->bd_holder,
nbc->backing_bdev->bd_holders);
retcode = ERR_BDCLAIM_DISK;
goto fail;
}
resync_lru = lc_create("resync", drbd_bm_ext_cache,
61, sizeof(struct bm_extent),
offsetof(struct bm_extent, lce));
if (!resync_lru) {
retcode = ERR_NOMEM;
goto release_bdev_fail;
}
/* meta_dev_idx >= 0: external fixed size,
* possibly multiple drbd sharing one meta device.
* TODO in that case, paranoia check that [md_bdev, meta_dev_idx] is
* not yet used by some other drbd minor!
* (if you use drbd.conf + drbdadm,
* that should check it for you already; but if you don't, or someone
* fooled it, we need to double check here) */
nbc->md_bdev = inode2->i_bdev;
if (bd_claim(nbc->md_bdev, (nbc->dc.meta_dev_idx < 0) ? (void *)mdev
: (void *) drbd_m_holder)) {
retcode = ERR_BDCLAIM_MD_DISK;
goto release_bdev_fail;
}
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)) {
retcode = ERR_MD_IDX_INVALID;
goto release_bdev2_fail;
}
/* 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) {
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);
retcode = ERR_DISK_TO_SMALL;
goto release_bdev2_fail;
}
if (nbc->dc.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);
}
if (drbd_get_capacity(nbc->md_bdev) < min_md_device_sectors) {
retcode = ERR_MD_DISK_TO_SMALL;
dev_warn(DEV, "refusing attach: md-device too small, "
"at least %llu sectors needed for this meta-disk type\n",
(unsigned long long) min_md_device_sectors);
goto release_bdev2_fail;
}
/* Make sure the new disk is big enough
* (we may currently be R_PRIMARY with no local disk...) */
if (drbd_get_max_capacity(nbc) <
drbd_get_capacity(mdev->this_bdev)) {
retcode = ERR_DISK_TO_SMALL;
goto release_bdev2_fail;
}
nbc->known_size = drbd_get_capacity(nbc->backing_bdev);
if (nbc->known_size > max_possible_sectors) {
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)
dev_warn(DEV, "==>> using internal or flexible "
"meta data may help <<==\n");
}
drbd_suspend_io(mdev);
/* also wait for the last barrier ack. */
wait_event(mdev->misc_wait, !atomic_read(&mdev->ap_pending_cnt));
/* and for any other previously queued work */
drbd_flush_workqueue(mdev);
retcode = _drbd_request_state(mdev, NS(disk, D_ATTACHING), CS_VERBOSE);
drbd_resume_io(mdev);
if (retcode < SS_SUCCESS)
goto release_bdev2_fail;
if (!get_ldev_if_state(mdev, D_ATTACHING))
goto force_diskless;
drbd_md_set_sector_offsets(mdev, nbc);
/* allocate a second IO page if logical_block_size != 512 */
logical_block_size = bdev_logical_block_size(nbc->md_bdev);
if (logical_block_size == 0)
logical_block_size = MD_SECTOR_SIZE;
if (logical_block_size != MD_SECTOR_SIZE) {
if (!mdev->md_io_tmpp) {
struct page *page = alloc_page(GFP_NOIO);
if (!page)
goto force_diskless_dec;
dev_warn(DEV, "Meta data's bdev logical_block_size = %d != %d\n",
logical_block_size, MD_SECTOR_SIZE);
dev_warn(DEV, "Workaround engaged (has performance impact).\n");
mdev->md_io_tmpp = page;
}
}
if (!mdev->bitmap) {
if (drbd_bm_init(mdev)) {
retcode = ERR_NOMEM;
goto force_diskless_dec;
}
}
retcode = drbd_md_read(mdev, nbc);
if (retcode != NO_ERROR)
goto force_diskless_dec;
if (mdev->state.conn < C_CONNECTED &&
mdev->state.role == R_PRIMARY &&
(mdev->ed_uuid & ~((u64)1)) != (nbc->md.uuid[UI_CURRENT] & ~((u64)1))) {
dev_err(DEV, "Can only attach to data with current UUID=%016llX\n",
(unsigned long long)mdev->ed_uuid);
retcode = ERR_DATA_NOT_CURRENT;
goto force_diskless_dec;
}
/* Since we are diskless, fix the activity log first... */
if (drbd_check_al_size(mdev)) {
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, 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;
}
if (!drbd_al_read_log(mdev, nbc)) {
retcode = ERR_IO_MD_DISK;
goto force_diskless_dec;
}
/* 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)
set_bit(MD_NO_BARRIER, &mdev->flags);
else
clear_bit(MD_NO_BARRIER, &mdev->flags);
/* 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
* clean it up somewhere. */
D_ASSERT(mdev->ldev == NULL);
mdev->ldev = nbc;
mdev->resync = resync_lru;
nbc = NULL;
resync_lru = NULL;
mdev->write_ordering = WO_bio_barrier;
drbd_bump_write_ordering(mdev, WO_bio_barrier);
if (drbd_md_test_flag(mdev->ldev, MDF_CRASHED_PRIMARY))
set_bit(CRASHED_PRIMARY, &mdev->flags);
else
clear_bit(CRASHED_PRIMARY, &mdev->flags);
if (drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND)) {
set_bit(CRASHED_PRIMARY, &mdev->flags);
cp_discovered = 1;
}
mdev->send_cnt = 0;
mdev->recv_cnt = 0;
mdev->read_cnt = 0;
mdev->writ_cnt = 0;
drbd_setup_queue_param(mdev, DRBD_MAX_SEGMENT_SIZE);
/* If I am currently not R_PRIMARY,
* but meta data primary indicator is set,
* I just now recover from a hard crash,
* and have been R_PRIMARY before that crash.
*
* Now, if I had no connection before that crash
* (have been degraded R_PRIMARY), chances are that
* I won't find my peer now either.
*
* In that case, and _only_ in that case,
* we use the degr-wfc-timeout instead of the default,
* so we can automatically recover from a crash of a
* degraded but active "cluster" after a certain timeout.
*/
clear_bit(USE_DEGR_WFC_T, &mdev->flags);
if (mdev->state.role != R_PRIMARY &&
drbd_md_test_flag(mdev->ldev, MDF_PRIMARY_IND) &&
!drbd_md_test_flag(mdev->ldev, MDF_CONNECTED_IND))
set_bit(USE_DEGR_WFC_T, &mdev->flags);
dd = drbd_determin_dev_size(mdev, 0);
if (dd == dev_size_error) {
retcode = ERR_NOMEM_BITMAP;
goto force_diskless_dec;
} else if (dd == grew)
set_bit(RESYNC_AFTER_NEG, &mdev->flags);
if (drbd_md_test_flag(mdev->ldev, MDF_FULL_SYNC)) {
dev_info(DEV, "Assuming that all blocks are out of sync "
"(aka FullSync)\n");
if (drbd_bitmap_io(mdev, &drbd_bmio_set_n_write, "set_n_write from attaching")) {
retcode = ERR_IO_MD_DISK;
goto force_diskless_dec;
}
} else {
if (drbd_bitmap_io(mdev, &drbd_bm_read, "read from attaching") < 0) {
retcode = ERR_IO_MD_DISK;
goto force_diskless_dec;
}
}
if (cp_discovered) {
drbd_al_apply_to_bm(mdev);
drbd_al_to_on_disk_bm(mdev);
}
spin_lock_irq(&mdev->req_lock);
os = mdev->state;
ns.i = os.i;
/* If MDF_CONSISTENT is not set go into inconsistent state,
otherwise investigate MDF_WasUpToDate...
If MDF_WAS_UP_TO_DATE is not set go into D_OUTDATED disk state,
otherwise into D_CONSISTENT state.
*/
if (drbd_md_test_flag(mdev->ldev, MDF_CONSISTENT)) {
if (drbd_md_test_flag(mdev->ldev, MDF_WAS_UP_TO_DATE))
ns.disk = D_CONSISTENT;
else
ns.disk = D_OUTDATED;
} else {
ns.disk = D_INCONSISTENT;
}
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))
ns.disk = D_UP_TO_DATE;
/* All tests on MDF_PRIMARY_IND, MDF_CONNECTED_IND,
MDF_CONSISTENT and MDF_WAS_UP_TO_DATE must happen before
this point, because drbd_request_state() modifies these
flags. */
/* In case we are C_CONNECTED postpone any decision on the new disk
state after the negotiation phase. */
if (mdev->state.conn == C_CONNECTED) {
mdev->new_state_tmp.i = ns.i;
ns.i = os.i;
ns.disk = D_NEGOTIATING;
/* We expect to receive up-to-date UUIDs soon.
To avoid a race in receive_state, free p_uuid while
holding req_lock. I.e. atomic with the state change */
kfree(mdev->p_uuid);
mdev->p_uuid = NULL;
}
rv = _drbd_set_state(mdev, ns, CS_VERBOSE, NULL);
ns = mdev->state;
spin_unlock_irq(&mdev->req_lock);
if (rv < SS_SUCCESS)
goto force_diskless_dec;
if (mdev->state.role == R_PRIMARY)
mdev->ldev->md.uuid[UI_CURRENT] |= (u64)1;
else
mdev->ldev->md.uuid[UI_CURRENT] &= ~(u64)1;
drbd_md_mark_dirty(mdev);
drbd_md_sync(mdev);
kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
put_ldev(mdev);
reply->ret_code = retcode;
drbd_reconfig_done(mdev);
return 0;
force_diskless_dec:
put_ldev(mdev);
force_diskless:
drbd_force_state(mdev, NS(disk, D_DISKLESS));
drbd_md_sync(mdev);
release_bdev2_fail:
if (nbc)
bd_release(nbc->md_bdev);
release_bdev_fail:
if (nbc)
bd_release(nbc->backing_bdev);
fail:
if (nbc) {
if (nbc->lo_file)
fput(nbc->lo_file);
if (nbc->md_file)
fput(nbc->md_file);
kfree(nbc);
}
lc_destroy(resync_lru);
reply->ret_code = retcode;
drbd_reconfig_done(mdev);
return 0;
}
static int drbd_nl_detach(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
struct drbd_nl_cfg_reply *reply)
{
reply->ret_code = drbd_request_state(mdev, NS(disk, D_DISKLESS));
return 0;
}
static int drbd_nl_net_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
struct drbd_nl_cfg_reply *reply)
{
int i, ns;
enum drbd_ret_codes retcode;
struct net_conf *new_conf = NULL;
struct crypto_hash *tfm = NULL;
struct crypto_hash *integrity_w_tfm = NULL;
struct crypto_hash *integrity_r_tfm = NULL;
struct hlist_head *new_tl_hash = NULL;
struct hlist_head *new_ee_hash = NULL;
struct drbd_conf *odev;
char hmac_name[CRYPTO_MAX_ALG_NAME];
void *int_dig_out = NULL;
void *int_dig_in = NULL;
void *int_dig_vv = NULL;
struct sockaddr *new_my_addr, *new_peer_addr, *taken_addr;
drbd_reconfig_start(mdev);
if (mdev->state.conn > C_STANDALONE) {
retcode = ERR_NET_CONFIGURED;
goto fail;
}
/* allocation not in the IO path, cqueue thread context */
new_conf = kzalloc(sizeof(struct net_conf), GFP_KERNEL);
if (!new_conf) {
retcode = ERR_NOMEM;
goto fail;
}
new_conf->timeout = DRBD_TIMEOUT_DEF;
new_conf->try_connect_int = DRBD_CONNECT_INT_DEF;
new_conf->ping_int = DRBD_PING_INT_DEF;
new_conf->max_epoch_size = DRBD_MAX_EPOCH_SIZE_DEF;
new_conf->max_buffers = DRBD_MAX_BUFFERS_DEF;
new_conf->unplug_watermark = DRBD_UNPLUG_WATERMARK_DEF;
new_conf->sndbuf_size = DRBD_SNDBUF_SIZE_DEF;
new_conf->rcvbuf_size = DRBD_RCVBUF_SIZE_DEF;
new_conf->ko_count = DRBD_KO_COUNT_DEF;
new_conf->after_sb_0p = DRBD_AFTER_SB_0P_DEF;
new_conf->after_sb_1p = DRBD_AFTER_SB_1P_DEF;
new_conf->after_sb_2p = DRBD_AFTER_SB_2P_DEF;
new_conf->want_lose = 0;
new_conf->two_primaries = 0;
new_conf->wire_protocol = DRBD_PROT_C;
new_conf->ping_timeo = DRBD_PING_TIMEO_DEF;
new_conf->rr_conflict = DRBD_RR_CONFLICT_DEF;
if (!net_conf_from_tags(mdev, nlp->tag_list, new_conf)) {
retcode = ERR_MANDATORY_TAG;
goto fail;
}
if (new_conf->two_primaries
&& (new_conf->wire_protocol != DRBD_PROT_C)) {
retcode = ERR_NOT_PROTO_C;
goto fail;
};
if (mdev->state.role == R_PRIMARY && new_conf->want_lose) {
retcode = ERR_DISCARD;
goto fail;
}
retcode = NO_ERROR;
new_my_addr = (struct sockaddr *)&new_conf->my_addr;
new_peer_addr = (struct sockaddr *)&new_conf->peer_addr;
for (i = 0; i < minor_count; i++) {
odev = minor_to_mdev(i);
if (!odev || odev == mdev)
continue;
if (get_net_conf(odev)) {
taken_addr = (struct sockaddr *)&odev->net_conf->my_addr;
if (new_conf->my_addr_len == odev->net_conf->my_addr_len &&
!memcmp(new_my_addr, taken_addr, new_conf->my_addr_len))
retcode = ERR_LOCAL_ADDR;
taken_addr = (struct sockaddr *)&odev->net_conf->peer_addr;
if (new_conf->peer_addr_len == odev->net_conf->peer_addr_len &&
!memcmp(new_peer_addr, taken_addr, new_conf->peer_addr_len))
retcode = ERR_PEER_ADDR;
put_net_conf(odev);
if (retcode != NO_ERROR)
goto fail;
}
}
if (new_conf->cram_hmac_alg[0] != 0) {
snprintf(hmac_name, CRYPTO_MAX_ALG_NAME, "hmac(%s)",
new_conf->cram_hmac_alg);
tfm = crypto_alloc_hash(hmac_name, 0, CRYPTO_ALG_ASYNC);
if (IS_ERR(tfm)) {
tfm = NULL;
retcode = ERR_AUTH_ALG;
goto fail;
}
if (!drbd_crypto_is_hash(crypto_hash_tfm(tfm))) {
retcode = ERR_AUTH_ALG_ND;
goto fail;
}
}
if (new_conf->integrity_alg[0]) {
integrity_w_tfm = crypto_alloc_hash(new_conf->integrity_alg, 0, CRYPTO_ALG_ASYNC);
if (IS_ERR(integrity_w_tfm)) {
integrity_w_tfm = NULL;
retcode=ERR_INTEGRITY_ALG;
goto fail;
}
if (!drbd_crypto_is_hash(crypto_hash_tfm(integrity_w_tfm))) {
retcode=ERR_INTEGRITY_ALG_ND;
goto fail;
}
integrity_r_tfm = crypto_alloc_hash(new_conf->integrity_alg, 0, CRYPTO_ALG_ASYNC);
if (IS_ERR(integrity_r_tfm)) {
integrity_r_tfm = NULL;
retcode=ERR_INTEGRITY_ALG;
goto fail;
}
}
ns = new_conf->max_epoch_size/8;
if (mdev->tl_hash_s != ns) {
new_tl_hash = kzalloc(ns*sizeof(void *), GFP_KERNEL);
if (!new_tl_hash) {
retcode = ERR_NOMEM;
goto fail;
}
}
ns = new_conf->max_buffers/8;
if (new_conf->two_primaries && (mdev->ee_hash_s != ns)) {
new_ee_hash = kzalloc(ns*sizeof(void *), GFP_KERNEL);
if (!new_ee_hash) {
retcode = ERR_NOMEM;
goto fail;
}
}
((char *)new_conf->shared_secret)[SHARED_SECRET_MAX-1] = 0;
if (integrity_w_tfm) {
i = crypto_hash_digestsize(integrity_w_tfm);
int_dig_out = kmalloc(i, GFP_KERNEL);
if (!int_dig_out) {
retcode = ERR_NOMEM;
goto fail;
}
int_dig_in = kmalloc(i, GFP_KERNEL);
if (!int_dig_in) {
retcode = ERR_NOMEM;
goto fail;
}
int_dig_vv = kmalloc(i, GFP_KERNEL);
if (!int_dig_vv) {
retcode = ERR_NOMEM;
goto fail;
}
}
if (!mdev->bitmap) {
if(drbd_bm_init(mdev)) {
retcode = ERR_NOMEM;
goto fail;
}
}
spin_lock_irq(&mdev->req_lock);
if (mdev->net_conf != NULL) {
retcode = ERR_NET_CONFIGURED;
spin_unlock_irq(&mdev->req_lock);
goto fail;
}
mdev->net_conf = new_conf;
mdev->send_cnt = 0;
mdev->recv_cnt = 0;
if (new_tl_hash) {
kfree(mdev->tl_hash);
mdev->tl_hash_s = mdev->net_conf->max_epoch_size/8;
mdev->tl_hash = new_tl_hash;
}
if (new_ee_hash) {
kfree(mdev->ee_hash);
mdev->ee_hash_s = mdev->net_conf->max_buffers/8;
mdev->ee_hash = new_ee_hash;
}
crypto_free_hash(mdev->cram_hmac_tfm);
mdev->cram_hmac_tfm = tfm;
crypto_free_hash(mdev->integrity_w_tfm);
mdev->integrity_w_tfm = integrity_w_tfm;
crypto_free_hash(mdev->integrity_r_tfm);
mdev->integrity_r_tfm = integrity_r_tfm;
kfree(mdev->int_dig_out);
kfree(mdev->int_dig_in);
kfree(mdev->int_dig_vv);
mdev->int_dig_out=int_dig_out;
mdev->int_dig_in=int_dig_in;
mdev->int_dig_vv=int_dig_vv;
spin_unlock_irq(&mdev->req_lock);
retcode = _drbd_request_state(mdev, NS(conn, C_UNCONNECTED), CS_VERBOSE);
kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
reply->ret_code = retcode;
drbd_reconfig_done(mdev);
return 0;
fail:
kfree(int_dig_out);
kfree(int_dig_in);
kfree(int_dig_vv);
crypto_free_hash(tfm);
crypto_free_hash(integrity_w_tfm);
crypto_free_hash(integrity_r_tfm);
kfree(new_tl_hash);
kfree(new_ee_hash);
kfree(new_conf);
reply->ret_code = retcode;
drbd_reconfig_done(mdev);
return 0;
}
static int drbd_nl_disconnect(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
struct drbd_nl_cfg_reply *reply)
{
int retcode;
retcode = _drbd_request_state(mdev, NS(conn, C_DISCONNECTING), CS_ORDERED);
if (retcode == SS_NOTHING_TO_DO)
goto done;
else if (retcode == SS_ALREADY_STANDALONE)
goto done;
else if (retcode == SS_PRIMARY_NOP) {
/* Our statche checking code wants to see the peer outdated. */
retcode = drbd_request_state(mdev, NS2(conn, C_DISCONNECTING,
pdsk, D_OUTDATED));
} else if (retcode == SS_CW_FAILED_BY_PEER) {
/* The peer probably wants to see us outdated. */
retcode = _drbd_request_state(mdev, NS2(conn, C_DISCONNECTING,
disk, D_OUTDATED),
CS_ORDERED);
if (retcode == SS_IS_DISKLESS || retcode == SS_LOWER_THAN_OUTDATED) {
drbd_force_state(mdev, NS(conn, C_DISCONNECTING));
retcode = SS_SUCCESS;
}
}
if (retcode < SS_SUCCESS)
goto fail;
if (wait_event_interruptible(mdev->state_wait,
mdev->state.conn != C_DISCONNECTING)) {
/* Do not test for mdev->state.conn == C_STANDALONE, since
someone else might connect us in the mean time! */
retcode = ERR_INTR;
goto fail;
}
done:
retcode = NO_ERROR;
fail:
drbd_md_sync(mdev);
reply->ret_code = retcode;
return 0;
}
void resync_after_online_grow(struct drbd_conf *mdev)
{
int iass; /* I am sync source */
dev_info(DEV, "Resync of new storage after online grow\n");
if (mdev->state.role != mdev->state.peer)
iass = (mdev->state.role == R_PRIMARY);
else
iass = test_bit(DISCARD_CONCURRENT, &mdev->flags);
if (iass)
drbd_start_resync(mdev, C_SYNC_SOURCE);
else
_drbd_request_state(mdev, NS(conn, C_WF_SYNC_UUID), CS_VERBOSE + CS_SERIALIZE);
}
static int drbd_nl_resize(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
struct drbd_nl_cfg_reply *reply)
{
struct resize rs;
int retcode = NO_ERROR;
enum determine_dev_size dd;
enum dds_flags ddsf;
memset(&rs, 0, sizeof(struct resize));
if (!resize_from_tags(mdev, nlp->tag_list, &rs)) {
retcode = ERR_MANDATORY_TAG;
goto fail;
}
if (mdev->state.conn > C_CONNECTED) {
retcode = ERR_RESIZE_RESYNC;
goto fail;
}
if (mdev->state.role == R_SECONDARY &&
mdev->state.peer == R_SECONDARY) {
retcode = ERR_NO_PRIMARY;
goto fail;
}
if (!get_ldev(mdev)) {
retcode = ERR_NO_DISK;
goto fail;
}
if (rs.no_resync && mdev->agreed_pro_version < 93) {
retcode = ERR_NEED_APV_93;
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;
ddsf = (rs.resize_force ? DDSF_FORCED : 0) | (rs.no_resync ? DDSF_NO_RESYNC : 0);
dd = drbd_determin_dev_size(mdev, ddsf);
drbd_md_sync(mdev);
put_ldev(mdev);
if (dd == dev_size_error) {
retcode = ERR_NOMEM_BITMAP;
goto fail;
}
if (mdev->state.conn == C_CONNECTED) {
if (dd == grew)
set_bit(RESIZE_PENDING, &mdev->flags);
drbd_send_uuids(mdev);
drbd_send_sizes(mdev, 1, ddsf);
}
fail:
reply->ret_code = retcode;
return 0;
}
static int drbd_nl_syncer_conf(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
struct drbd_nl_cfg_reply *reply)
{
int retcode = NO_ERROR;
int err;
int ovr; /* online verify running */
int rsr; /* re-sync running */
struct crypto_hash *verify_tfm = NULL;
struct crypto_hash *csums_tfm = NULL;
struct syncer_conf sc;
cpumask_var_t new_cpu_mask;
if (!zalloc_cpumask_var(&new_cpu_mask, GFP_KERNEL)) {
retcode = ERR_NOMEM;
goto fail;
}
if (nlp->flags & DRBD_NL_SET_DEFAULTS) {
memset(&sc, 0, sizeof(struct syncer_conf));
sc.rate = DRBD_RATE_DEF;
sc.after = DRBD_AFTER_DEF;
sc.al_extents = DRBD_AL_EXTENTS_DEF;
} else
memcpy(&sc, &mdev->sync_conf, sizeof(struct syncer_conf));
if (!syncer_conf_from_tags(mdev, nlp->tag_list, &sc)) {
retcode = ERR_MANDATORY_TAG;
goto fail;
}
/* re-sync running */
rsr = ( mdev->state.conn == C_SYNC_SOURCE ||
mdev->state.conn == C_SYNC_TARGET ||
mdev->state.conn == C_PAUSED_SYNC_S ||
mdev->state.conn == C_PAUSED_SYNC_T );
if (rsr && strcmp(sc.csums_alg, mdev->sync_conf.csums_alg)) {
retcode = ERR_CSUMS_RESYNC_RUNNING;
goto fail;
}
if (!rsr && sc.csums_alg[0]) {
csums_tfm = crypto_alloc_hash(sc.csums_alg, 0, CRYPTO_ALG_ASYNC);
if (IS_ERR(csums_tfm)) {
csums_tfm = NULL;
retcode = ERR_CSUMS_ALG;
goto fail;
}
if (!drbd_crypto_is_hash(crypto_hash_tfm(csums_tfm))) {
retcode = ERR_CSUMS_ALG_ND;
goto fail;
}
}
/* online verify running */
ovr = (mdev->state.conn == C_VERIFY_S || mdev->state.conn == C_VERIFY_T);
if (ovr) {
if (strcmp(sc.verify_alg, mdev->sync_conf.verify_alg)) {
retcode = ERR_VERIFY_RUNNING;
goto fail;
}
}
if (!ovr && sc.verify_alg[0]) {
verify_tfm = crypto_alloc_hash(sc.verify_alg, 0, CRYPTO_ALG_ASYNC);
if (IS_ERR(verify_tfm)) {
verify_tfm = NULL;
retcode = ERR_VERIFY_ALG;
goto fail;
}
if (!drbd_crypto_is_hash(crypto_hash_tfm(verify_tfm))) {
retcode = ERR_VERIFY_ALG_ND;
goto fail;
}
}
/* silently ignore cpu mask on UP kernel */
if (nr_cpu_ids > 1 && sc.cpu_mask[0] != 0) {
err = __bitmap_parse(sc.cpu_mask, 32, 0,
cpumask_bits(new_cpu_mask), nr_cpu_ids);
if (err) {
dev_warn(DEV, "__bitmap_parse() failed with %d\n", err);
retcode = ERR_CPU_MASK_PARSE;
goto fail;
}
}
ERR_IF (sc.rate < 1) sc.rate = 1;
ERR_IF (sc.al_extents < 7) sc.al_extents = 127; /* arbitrary minimum */
#define AL_MAX ((MD_AL_MAX_SIZE-1) * AL_EXTENTS_PT)
if (sc.al_extents > AL_MAX) {
dev_err(DEV, "sc.al_extents > %d\n", AL_MAX);
sc.al_extents = AL_MAX;
}
#undef AL_MAX
/* most sanity checks done, try to assign the new sync-after
* dependency. need to hold the global lock in there,
* to avoid a race in the dependency loop check. */
retcode = drbd_alter_sa(mdev, sc.after);
if (retcode != NO_ERROR)
goto fail;
/* ok, assign the rest of it as well.
* lock against receive_SyncParam() */
spin_lock(&mdev->peer_seq_lock);
mdev->sync_conf = sc;
if (!rsr) {
crypto_free_hash(mdev->csums_tfm);
mdev->csums_tfm = csums_tfm;
csums_tfm = NULL;
}
if (!ovr) {
crypto_free_hash(mdev->verify_tfm);
mdev->verify_tfm = verify_tfm;
verify_tfm = NULL;
}
spin_unlock(&mdev->peer_seq_lock);
if (get_ldev(mdev)) {
wait_event(mdev->al_wait, lc_try_lock(mdev->act_log));
drbd_al_shrink(mdev);
err = drbd_check_al_size(mdev);
lc_unlock(mdev->act_log);
wake_up(&mdev->al_wait);
put_ldev(mdev);
drbd_md_sync(mdev);
if (err) {
retcode = ERR_NOMEM;
goto fail;
}
}
if (mdev->state.conn >= C_CONNECTED)
drbd_send_sync_param(mdev, &sc);
if (!cpumask_equal(mdev->cpu_mask, new_cpu_mask)) {
cpumask_copy(mdev->cpu_mask, new_cpu_mask);
drbd_calc_cpu_mask(mdev);
mdev->receiver.reset_cpu_mask = 1;
mdev->asender.reset_cpu_mask = 1;
mdev->worker.reset_cpu_mask = 1;
}
kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE);
fail:
free_cpumask_var(new_cpu_mask);
crypto_free_hash(csums_tfm);
crypto_free_hash(verify_tfm);
reply->ret_code = retcode;
return 0;
}
static int drbd_nl_invalidate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
struct drbd_nl_cfg_reply *reply)
{
int retcode;
retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T), CS_ORDERED);
if (retcode < SS_SUCCESS && retcode != SS_NEED_CONNECTION)
retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
while (retcode == SS_NEED_CONNECTION) {
spin_lock_irq(&mdev->req_lock);
if (mdev->state.conn < C_CONNECTED)
retcode = _drbd_set_state(_NS(mdev, disk, D_INCONSISTENT), CS_VERBOSE, NULL);
spin_unlock_irq(&mdev->req_lock);
if (retcode != SS_NEED_CONNECTION)
break;
retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_T));
}
reply->ret_code = retcode;
return 0;
}
static int drbd_nl_invalidate_peer(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
struct drbd_nl_cfg_reply *reply)
{
reply->ret_code = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S));
return 0;
}
static int drbd_nl_pause_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
struct drbd_nl_cfg_reply *reply)
{
int retcode = NO_ERROR;
if (drbd_request_state(mdev, NS(user_isp, 1)) == SS_NOTHING_TO_DO)
retcode = ERR_PAUSE_IS_SET;
reply->ret_code = retcode;
return 0;
}
static int drbd_nl_resume_sync(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
struct drbd_nl_cfg_reply *reply)
{
int retcode = NO_ERROR;
if (drbd_request_state(mdev, NS(user_isp, 0)) == SS_NOTHING_TO_DO)
retcode = ERR_PAUSE_IS_CLEAR;
reply->ret_code = retcode;
return 0;
}
static int drbd_nl_suspend_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
struct drbd_nl_cfg_reply *reply)
{
reply->ret_code = drbd_request_state(mdev, NS(susp, 1));
return 0;
}
static int drbd_nl_resume_io(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
struct drbd_nl_cfg_reply *reply)
{
reply->ret_code = drbd_request_state(mdev, NS(susp, 0));
return 0;
}
static int drbd_nl_outdate(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
struct drbd_nl_cfg_reply *reply)
{
reply->ret_code = drbd_request_state(mdev, NS(disk, D_OUTDATED));
return 0;
}
static int drbd_nl_get_config(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
struct drbd_nl_cfg_reply *reply)
{
unsigned short *tl;
tl = reply->tag_list;
if (get_ldev(mdev)) {
tl = disk_conf_to_tags(mdev, &mdev->ldev->dc, tl);
put_ldev(mdev);
}
if (get_net_conf(mdev)) {
tl = net_conf_to_tags(mdev, mdev->net_conf, tl);
put_net_conf(mdev);
}
tl = syncer_conf_to_tags(mdev, &mdev->sync_conf, tl);
put_unaligned(TT_END, tl++); /* Close the tag list */
return (int)((char *)tl - (char *)reply->tag_list);
}
static int drbd_nl_get_state(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
struct drbd_nl_cfg_reply *reply)
{
unsigned short *tl = reply->tag_list;
union drbd_state s = mdev->state;
unsigned long rs_left;
unsigned int res;
tl = get_state_to_tags(mdev, (struct get_state *)&s, tl);
/* no local ref, no bitmap, no syncer progress. */
if (s.conn >= C_SYNC_SOURCE && s.conn <= C_PAUSED_SYNC_T) {
if (get_ldev(mdev)) {
drbd_get_syncer_progress(mdev, &rs_left, &res);
tl = tl_add_int(tl, T_sync_progress, &res);
put_ldev(mdev);
}
}
put_unaligned(TT_END, tl++); /* Close the tag list */
return (int)((char *)tl - (char *)reply->tag_list);
}
static int drbd_nl_get_uuids(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
struct drbd_nl_cfg_reply *reply)
{
unsigned short *tl;
tl = reply->tag_list;
if (get_ldev(mdev)) {
tl = tl_add_blob(tl, T_uuids, mdev->ldev->md.uuid, UI_SIZE*sizeof(u64));
tl = tl_add_int(tl, T_uuids_flags, &mdev->ldev->md.flags);
put_ldev(mdev);
}
put_unaligned(TT_END, tl++); /* Close the tag list */
return (int)((char *)tl - (char *)reply->tag_list);
}
/**
* drbd_nl_get_timeout_flag() - Used by drbdsetup to find out which timeout value to use
* @mdev: DRBD device.
* @nlp: Netlink/connector packet from drbdsetup
* @reply: Reply packet for drbdsetup
*/
static int drbd_nl_get_timeout_flag(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
struct drbd_nl_cfg_reply *reply)
{
unsigned short *tl;
char rv;
tl = reply->tag_list;
rv = mdev->state.pdsk == D_OUTDATED ? UT_PEER_OUTDATED :
test_bit(USE_DEGR_WFC_T, &mdev->flags) ? UT_DEGRADED : UT_DEFAULT;
tl = tl_add_blob(tl, T_use_degraded, &rv, sizeof(rv));
put_unaligned(TT_END, tl++); /* Close the tag list */
return (int)((char *)tl - (char *)reply->tag_list);
}
static int drbd_nl_start_ov(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
struct drbd_nl_cfg_reply *reply)
{
/* default to resume from last known position, if possible */
struct start_ov args =
{ .start_sector = mdev->ov_start_sector };
if (!start_ov_from_tags(mdev, nlp->tag_list, &args)) {
reply->ret_code = ERR_MANDATORY_TAG;
return 0;
}
/* w_make_ov_request expects position to be aligned */
mdev->ov_start_sector = args.start_sector & ~BM_SECT_PER_BIT;
reply->ret_code = drbd_request_state(mdev,NS(conn,C_VERIFY_S));
return 0;
}
static int drbd_nl_new_c_uuid(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp,
struct drbd_nl_cfg_reply *reply)
{
int retcode = NO_ERROR;
int skip_initial_sync = 0;
int err;
struct new_c_uuid args;
memset(&args, 0, sizeof(struct new_c_uuid));
if (!new_c_uuid_from_tags(mdev, nlp->tag_list, &args)) {
reply->ret_code = ERR_MANDATORY_TAG;
return 0;
}
mutex_lock(&mdev->state_mutex); /* Protects us against serialized state changes. */
if (!get_ldev(mdev)) {
retcode = ERR_NO_DISK;
goto out;
}
/* this is "skip initial sync", assume to be clean */
if (mdev->state.conn == C_CONNECTED && mdev->agreed_pro_version >= 90 &&
mdev->ldev->md.uuid[UI_CURRENT] == UUID_JUST_CREATED && args.clear_bm) {
dev_info(DEV, "Preparing to skip initial sync\n");
skip_initial_sync = 1;
} else if (mdev->state.conn != C_STANDALONE) {
retcode = ERR_CONNECTED;
goto out_dec;
}
drbd_uuid_set(mdev, UI_BITMAP, 0); /* Rotate UI_BITMAP to History 1, etc... */
drbd_uuid_new_current(mdev); /* New current, previous to UI_BITMAP */
if (args.clear_bm) {
err = drbd_bitmap_io(mdev, &drbd_bmio_clear_n_write, "clear_n_write from new_c_uuid");
if (err) {
dev_err(DEV, "Writing bitmap failed with %d\n",err);
retcode = ERR_IO_MD_DISK;
}
if (skip_initial_sync) {
drbd_send_uuids_skip_initial_sync(mdev);
_drbd_uuid_set(mdev, UI_BITMAP, 0);
spin_lock_irq(&mdev->req_lock);
_drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE),
CS_VERBOSE, NULL);
spin_unlock_irq(&mdev->req_lock);
}
}
drbd_md_sync(mdev);
out_dec:
put_ldev(mdev);
out:
mutex_unlock(&mdev->state_mutex);
reply->ret_code = retcode;
return 0;
}
static struct drbd_conf *ensure_mdev(struct drbd_nl_cfg_req *nlp)
{
struct drbd_conf *mdev;
if (nlp->drbd_minor >= minor_count)
return NULL;
mdev = minor_to_mdev(nlp->drbd_minor);
if (!mdev && (nlp->flags & DRBD_NL_CREATE_DEVICE)) {
struct gendisk *disk = NULL;
mdev = drbd_new_device(nlp->drbd_minor);
spin_lock_irq(&drbd_pp_lock);
if (minor_table[nlp->drbd_minor] == NULL) {
minor_table[nlp->drbd_minor] = mdev;
disk = mdev->vdisk;
mdev = NULL;
} /* else: we lost the race */
spin_unlock_irq(&drbd_pp_lock);
if (disk) /* we won the race above */
/* in case we ever add a drbd_delete_device(),
* don't forget the del_gendisk! */
add_disk(disk);
else /* we lost the race above */
drbd_free_mdev(mdev);
mdev = minor_to_mdev(nlp->drbd_minor);
}
return mdev;
}
struct cn_handler_struct {
int (*function)(struct drbd_conf *,
struct drbd_nl_cfg_req *,
struct drbd_nl_cfg_reply *);
int reply_body_size;
};
static struct cn_handler_struct cnd_table[] = {
[ P_primary ] = { &drbd_nl_primary, 0 },
[ P_secondary ] = { &drbd_nl_secondary, 0 },
[ P_disk_conf ] = { &drbd_nl_disk_conf, 0 },
[ P_detach ] = { &drbd_nl_detach, 0 },
[ P_net_conf ] = { &drbd_nl_net_conf, 0 },
[ P_disconnect ] = { &drbd_nl_disconnect, 0 },
[ P_resize ] = { &drbd_nl_resize, 0 },
[ P_syncer_conf ] = { &drbd_nl_syncer_conf, 0 },
[ P_invalidate ] = { &drbd_nl_invalidate, 0 },
[ P_invalidate_peer ] = { &drbd_nl_invalidate_peer, 0 },
[ P_pause_sync ] = { &drbd_nl_pause_sync, 0 },
[ P_resume_sync ] = { &drbd_nl_resume_sync, 0 },
[ P_suspend_io ] = { &drbd_nl_suspend_io, 0 },
[ P_resume_io ] = { &drbd_nl_resume_io, 0 },
[ P_outdate ] = { &drbd_nl_outdate, 0 },
[ P_get_config ] = { &drbd_nl_get_config,
sizeof(struct syncer_conf_tag_len_struct) +
sizeof(struct disk_conf_tag_len_struct) +
sizeof(struct net_conf_tag_len_struct) },
[ P_get_state ] = { &drbd_nl_get_state,
sizeof(struct get_state_tag_len_struct) +
sizeof(struct sync_progress_tag_len_struct) },
[ P_get_uuids ] = { &drbd_nl_get_uuids,
sizeof(struct get_uuids_tag_len_struct) },
[ P_get_timeout_flag ] = { &drbd_nl_get_timeout_flag,
sizeof(struct get_timeout_flag_tag_len_struct)},
[ P_start_ov ] = { &drbd_nl_start_ov, 0 },
[ P_new_c_uuid ] = { &drbd_nl_new_c_uuid, 0 },
};
static void drbd_connector_callback(struct cn_msg *req, struct netlink_skb_parms *nsp)
{
struct drbd_nl_cfg_req *nlp = (struct drbd_nl_cfg_req *)req->data;
struct cn_handler_struct *cm;
struct cn_msg *cn_reply;
struct drbd_nl_cfg_reply *reply;
struct drbd_conf *mdev;
int retcode, rr;
int reply_size = sizeof(struct cn_msg)
+ sizeof(struct drbd_nl_cfg_reply)
+ sizeof(short int);
if (!try_module_get(THIS_MODULE)) {
printk(KERN_ERR "drbd: try_module_get() failed!\n");
return;
}
if (!cap_raised(nsp->eff_cap, CAP_SYS_ADMIN)) {
retcode = ERR_PERM;
goto fail;
}
mdev = ensure_mdev(nlp);
if (!mdev) {
retcode = ERR_MINOR_INVALID;
goto fail;
}
if (nlp->packet_type >= P_nl_after_last_packet) {
retcode = ERR_PACKET_NR;
goto fail;
}
cm = cnd_table + nlp->packet_type;
/* This may happen if packet number is 0: */
if (cm->function == NULL) {
retcode = ERR_PACKET_NR;
goto fail;
}
reply_size += cm->reply_body_size;
/* allocation not in the IO path, cqueue thread context */
cn_reply = kmalloc(reply_size, GFP_KERNEL);
if (!cn_reply) {
retcode = ERR_NOMEM;
goto fail;
}
reply = (struct drbd_nl_cfg_reply *) cn_reply->data;
reply->packet_type =
cm->reply_body_size ? nlp->packet_type : P_nl_after_last_packet;
reply->minor = nlp->drbd_minor;
reply->ret_code = NO_ERROR; /* Might by modified by cm->function. */
/* reply->tag_list; might be modified by cm->function. */
rr = cm->function(mdev, nlp, reply);
cn_reply->id = req->id;
cn_reply->seq = req->seq;
cn_reply->ack = req->ack + 1;
cn_reply->len = sizeof(struct drbd_nl_cfg_reply) + rr;
cn_reply->flags = 0;
rr = cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_KERNEL);
if (rr && rr != -ESRCH)
printk(KERN_INFO "drbd: cn_netlink_send()=%d\n", rr);
kfree(cn_reply);
module_put(THIS_MODULE);
return;
fail:
drbd_nl_send_reply(req, retcode);
module_put(THIS_MODULE);
}
static atomic_t drbd_nl_seq = ATOMIC_INIT(2); /* two. */
static unsigned short *
__tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data,
unsigned short len, int nul_terminated)
{
unsigned short l = tag_descriptions[tag_number(tag)].max_len;
len = (len < l) ? len : l;
put_unaligned(tag, tl++);
put_unaligned(len, tl++);
memcpy(tl, data, len);
tl = (unsigned short*)((char*)tl + len);
if (nul_terminated)
*((char*)tl - 1) = 0;
return tl;
}
static unsigned short *
tl_add_blob(unsigned short *tl, enum drbd_tags tag, const void *data, int len)
{
return __tl_add_blob(tl, tag, data, len, 0);
}
static unsigned short *
tl_add_str(unsigned short *tl, enum drbd_tags tag, const char *str)
{
return __tl_add_blob(tl, tag, str, strlen(str)+1, 0);
}
static unsigned short *
tl_add_int(unsigned short *tl, enum drbd_tags tag, const void *val)
{
put_unaligned(tag, tl++);
switch(tag_type(tag)) {
case TT_INTEGER:
put_unaligned(sizeof(int), tl++);
put_unaligned(*(int *)val, (int *)tl);
tl = (unsigned short*)((char*)tl+sizeof(int));
break;
case TT_INT64:
put_unaligned(sizeof(u64), tl++);
put_unaligned(*(u64 *)val, (u64 *)tl);
tl = (unsigned short*)((char*)tl+sizeof(u64));
break;
default:
/* someone did something stupid. */
;
}
return tl;
}
void drbd_bcast_state(struct drbd_conf *mdev, union drbd_state state)
{
char buffer[sizeof(struct cn_msg)+
sizeof(struct drbd_nl_cfg_reply)+
sizeof(struct get_state_tag_len_struct)+
sizeof(short int)];
struct cn_msg *cn_reply = (struct cn_msg *) buffer;
struct drbd_nl_cfg_reply *reply =
(struct drbd_nl_cfg_reply *)cn_reply->data;
unsigned short *tl = reply->tag_list;
/* dev_warn(DEV, "drbd_bcast_state() got called\n"); */
tl = get_state_to_tags(mdev, (struct get_state *)&state, tl);
put_unaligned(TT_END, tl++); /* Close the tag list */
cn_reply->id.idx = CN_IDX_DRBD;
cn_reply->id.val = CN_VAL_DRBD;
cn_reply->seq = atomic_add_return(1, &drbd_nl_seq);
cn_reply->ack = 0; /* not used here. */
cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
(int)((char *)tl - (char *)reply->tag_list);
cn_reply->flags = 0;
reply->packet_type = P_get_state;
reply->minor = mdev_to_minor(mdev);
reply->ret_code = NO_ERROR;
cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
}
void drbd_bcast_ev_helper(struct drbd_conf *mdev, char *helper_name)
{
char buffer[sizeof(struct cn_msg)+
sizeof(struct drbd_nl_cfg_reply)+
sizeof(struct call_helper_tag_len_struct)+
sizeof(short int)];
struct cn_msg *cn_reply = (struct cn_msg *) buffer;
struct drbd_nl_cfg_reply *reply =
(struct drbd_nl_cfg_reply *)cn_reply->data;
unsigned short *tl = reply->tag_list;
/* dev_warn(DEV, "drbd_bcast_state() got called\n"); */
tl = tl_add_str(tl, T_helper, helper_name);
put_unaligned(TT_END, tl++); /* Close the tag list */
cn_reply->id.idx = CN_IDX_DRBD;
cn_reply->id.val = CN_VAL_DRBD;
cn_reply->seq = atomic_add_return(1, &drbd_nl_seq);
cn_reply->ack = 0; /* not used here. */
cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
(int)((char *)tl - (char *)reply->tag_list);
cn_reply->flags = 0;
reply->packet_type = P_call_helper;
reply->minor = mdev_to_minor(mdev);
reply->ret_code = NO_ERROR;
cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
}
void drbd_bcast_ee(struct drbd_conf *mdev,
const char *reason, const int dgs,
const char* seen_hash, const char* calc_hash,
const struct drbd_epoch_entry* e)
{
struct cn_msg *cn_reply;
struct drbd_nl_cfg_reply *reply;
unsigned short *tl;
struct page *page;
unsigned len;
if (!e)
return;
if (!reason || !reason[0])
return;
/* apparently we have to memcpy twice, first to prepare the data for the
* struct cn_msg, then within cn_netlink_send from the cn_msg to the
* netlink skb. */
/* receiver thread context, which is not in the writeout path (of this node),
* but may be in the writeout path of the _other_ node.
* GFP_NOIO to avoid potential "distributed deadlock". */
cn_reply = kmalloc(
sizeof(struct cn_msg)+
sizeof(struct drbd_nl_cfg_reply)+
sizeof(struct dump_ee_tag_len_struct)+
sizeof(short int),
GFP_NOIO);
if (!cn_reply) {
dev_err(DEV, "could not kmalloc buffer for drbd_bcast_ee, sector %llu, size %u\n",
(unsigned long long)e->sector, e->size);
return;
}
reply = (struct drbd_nl_cfg_reply*)cn_reply->data;
tl = reply->tag_list;
tl = tl_add_str(tl, T_dump_ee_reason, reason);
tl = tl_add_blob(tl, T_seen_digest, seen_hash, dgs);
tl = tl_add_blob(tl, T_calc_digest, calc_hash, dgs);
tl = tl_add_int(tl, T_ee_sector, &e->sector);
tl = tl_add_int(tl, T_ee_block_id, &e->block_id);
put_unaligned(T_ee_data, tl++);
put_unaligned(e->size, tl++);
len = e->size;
page = e->pages;
page_chain_for_each(page) {
void *d = kmap_atomic(page, KM_USER0);
unsigned l = min_t(unsigned, len, PAGE_SIZE);
memcpy(tl, d, l);
kunmap_atomic(d, KM_USER0);
tl = (unsigned short*)((char*)tl + l);
len -= l;
}
put_unaligned(TT_END, tl++); /* Close the tag list */
cn_reply->id.idx = CN_IDX_DRBD;
cn_reply->id.val = CN_VAL_DRBD;
cn_reply->seq = atomic_add_return(1,&drbd_nl_seq);
cn_reply->ack = 0; // not used here.
cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
(int)((char*)tl - (char*)reply->tag_list);
cn_reply->flags = 0;
reply->packet_type = P_dump_ee;
reply->minor = mdev_to_minor(mdev);
reply->ret_code = NO_ERROR;
cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
kfree(cn_reply);
}
void drbd_bcast_sync_progress(struct drbd_conf *mdev)
{
char buffer[sizeof(struct cn_msg)+
sizeof(struct drbd_nl_cfg_reply)+
sizeof(struct sync_progress_tag_len_struct)+
sizeof(short int)];
struct cn_msg *cn_reply = (struct cn_msg *) buffer;
struct drbd_nl_cfg_reply *reply =
(struct drbd_nl_cfg_reply *)cn_reply->data;
unsigned short *tl = reply->tag_list;
unsigned long rs_left;
unsigned int res;
/* no local ref, no bitmap, no syncer progress, no broadcast. */
if (!get_ldev(mdev))
return;
drbd_get_syncer_progress(mdev, &rs_left, &res);
put_ldev(mdev);
tl = tl_add_int(tl, T_sync_progress, &res);
put_unaligned(TT_END, tl++); /* Close the tag list */
cn_reply->id.idx = CN_IDX_DRBD;
cn_reply->id.val = CN_VAL_DRBD;
cn_reply->seq = atomic_add_return(1, &drbd_nl_seq);
cn_reply->ack = 0; /* not used here. */
cn_reply->len = sizeof(struct drbd_nl_cfg_reply) +
(int)((char *)tl - (char *)reply->tag_list);
cn_reply->flags = 0;
reply->packet_type = P_sync_progress;
reply->minor = mdev_to_minor(mdev);
reply->ret_code = NO_ERROR;
cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
}
int __init drbd_nl_init(void)
{
static struct cb_id cn_id_drbd;
int err, try=10;
cn_id_drbd.val = CN_VAL_DRBD;
do {
cn_id_drbd.idx = cn_idx;
err = cn_add_callback(&cn_id_drbd, "cn_drbd", &drbd_connector_callback);
if (!err)
break;
cn_idx = (cn_idx + CN_IDX_STEP);
} while (try--);
if (err) {
printk(KERN_ERR "drbd: cn_drbd failed to register\n");
return err;
}
return 0;
}
void drbd_nl_cleanup(void)
{
static struct cb_id cn_id_drbd;
cn_id_drbd.idx = cn_idx;
cn_id_drbd.val = CN_VAL_DRBD;
cn_del_callback(&cn_id_drbd);
}
void drbd_nl_send_reply(struct cn_msg *req, int ret_code)
{
char buffer[sizeof(struct cn_msg)+sizeof(struct drbd_nl_cfg_reply)];
struct cn_msg *cn_reply = (struct cn_msg *) buffer;
struct drbd_nl_cfg_reply *reply =
(struct drbd_nl_cfg_reply *)cn_reply->data;
int rr;
cn_reply->id = req->id;
cn_reply->seq = req->seq;
cn_reply->ack = req->ack + 1;
cn_reply->len = sizeof(struct drbd_nl_cfg_reply);
cn_reply->flags = 0;
reply->minor = ((struct drbd_nl_cfg_req *)req->data)->drbd_minor;
reply->ret_code = ret_code;
rr = cn_netlink_send(cn_reply, CN_IDX_DRBD, GFP_NOIO);
if (rr && rr != -ESRCH)
printk(KERN_INFO "drbd: cn_netlink_send()=%d\n", rr);
}
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