| /* |
| 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_req.h" |
| #include "drbd_wrappers.h" |
| #include <asm/unaligned.h> |
| #include <linux/drbd_tag_magic.h> |
| #include <linux/drbd_limits.h> |
| #include <linux/compiler.h> |
| #include <linux/kthread.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->tconn)) { |
| switch (((struct sockaddr *)mdev->tconn->net_conf->peer_addr)->sa_family) { |
| case AF_INET6: |
| afs = "ipv6"; |
| snprintf(ad, 60, "DRBD_PEER_ADDRESS=%pI6", |
| &((struct sockaddr_in6 *)mdev->tconn->net_conf->peer_addr)->sin6_addr); |
| break; |
| case AF_INET: |
| afs = "ipv4"; |
| snprintf(ad, 60, "DRBD_PEER_ADDRESS=%pI4", |
| &((struct sockaddr_in *)mdev->tconn->net_conf->peer_addr)->sin_addr); |
| break; |
| default: |
| afs = "ssocks"; |
| snprintf(ad, 60, "DRBD_PEER_ADDRESS=%pI4", |
| &((struct sockaddr_in *)mdev->tconn->net_conf->peer_addr)->sin_addr); |
| } |
| snprintf(af, 20, "DRBD_PEER_AF=%s", afs); |
| envp[3]=af; |
| envp[4]=ad; |
| put_net_conf(mdev->tconn); |
| } |
| |
| /* The helper may take some time. |
| * write out any unsynced meta data changes now */ |
| drbd_md_sync(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"); |
| nps = mdev->state.pdsk; |
| goto out; |
| } |
| |
| 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); |
| |
| out: |
| if (mdev->state.susp_fen && nps >= D_UNKNOWN) { |
| /* The handler was not successful... unfreeze here, the |
| state engine can not unfreeze... */ |
| _drbd_request_state(mdev, NS(susp_fen, 0), CS_VERBOSE); |
| } |
| |
| return nps; |
| } |
| |
| static int _try_outdate_peer_async(void *data) |
| { |
| struct drbd_conf *mdev = (struct drbd_conf *)data; |
| enum drbd_disk_state nps; |
| union drbd_state ns; |
| |
| nps = drbd_try_outdate_peer(mdev); |
| |
| /* Not using |
| drbd_request_state(mdev, NS(pdsk, nps)); |
| here, because we might were able to re-establish the connection |
| in the meantime. This can only partially be solved in the state's |
| engine is_valid_state() and is_valid_state_transition() |
| functions. |
| |
| nps can be D_INCONSISTENT, D_OUTDATED or D_UNKNOWN. |
| pdsk == D_INCONSISTENT while conn >= C_CONNECTED is valid, |
| therefore we have to have the pre state change check here. |
| */ |
| spin_lock_irq(&mdev->tconn->req_lock); |
| ns = mdev->state; |
| if (ns.conn < C_WF_REPORT_PARAMS) { |
| ns.pdsk = nps; |
| _drbd_set_state(mdev, ns, CS_VERBOSE, NULL); |
| } |
| spin_unlock_irq(&mdev->tconn->req_lock); |
| |
| return 0; |
| } |
| |
| void drbd_try_outdate_peer_async(struct drbd_conf *mdev) |
| { |
| struct task_struct *opa; |
| |
| opa = kthread_run(_try_outdate_peer_async, mdev, "drbd%d_a_helper", mdev_to_minor(mdev)); |
| if (IS_ERR(opa)) |
| dev_err(DEV, "out of mem, failed to invoke fence-peer helper\n"); |
| } |
| |
| enum drbd_state_rv |
| drbd_set_role(struct drbd_conf *mdev, enum drbd_role new_role, int force) |
| { |
| const int max_tries = 4; |
| enum drbd_state_rv rv = SS_UNKNOWN_ERROR; |
| int try = 0; |
| int forced = 0; |
| union drbd_state mask, val; |
| enum drbd_disk_state nps; |
| |
| if (new_role == R_PRIMARY) |
| request_ping(mdev->tconn); /* 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) { |
| rv = _drbd_request_state(mdev, mask, val, CS_WAIT_COMPLETE); |
| |
| /* in case we first succeeded to outdate, |
| * but now suddenly could establish a connection */ |
| if (rv == SS_CW_FAILED_BY_PEER && mask.pdsk != 0) { |
| val.pdsk = 0; |
| mask.pdsk = 0; |
| continue; |
| } |
| |
| if (rv == 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 (rv == 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 (rv == SS_NOTHING_TO_DO) |
| goto fail; |
| if (rv == 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 (rv == SS_TWO_PRIMARIES) { |
| /* Maybe the peer is detected as dead very soon... |
| retry at most once more in this case. */ |
| schedule_timeout_interruptible((mdev->tconn->net_conf->ping_timeo+1)*HZ/10); |
| if (try < max_tries) |
| try = max_tries - 1; |
| continue; |
| } |
| if (rv < SS_SUCCESS) { |
| rv = _drbd_request_state(mdev, mask, val, |
| CS_VERBOSE + CS_WAIT_COMPLETE); |
| if (rv < SS_SUCCESS) |
| goto fail; |
| } |
| break; |
| } |
| |
| if (rv < 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->tconn)) { |
| mdev->tconn->net_conf->want_lose = 0; |
| put_net_conf(mdev->tconn); |
| } |
| 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); |
| } |
| } |
| |
| /* writeout of activity log covered areas of the bitmap |
| * to stable storage done in after state change already */ |
| |
| 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 rv; |
| } |
| |
| static struct drbd_conf *ensure_mdev(int minor, int create) |
| { |
| struct drbd_conf *mdev; |
| |
| if (minor >= minor_count) |
| return NULL; |
| |
| mdev = minor_to_mdev(minor); |
| |
| if (!mdev && create) { |
| struct gendisk *disk = NULL; |
| mdev = drbd_new_device(minor); |
| |
| spin_lock_irq(&drbd_pp_lock); |
| if (minor_table[minor] == NULL) { |
| minor_table[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(minor); |
| } |
| |
| return mdev; |
| } |
| |
| 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; |
| } |
| } |
| |
| /* input size is expected to be in KB */ |
| char *ppsize(char *buf, unsigned long long size) |
| { |
| /* Needs 9 bytes at max including trailing NUL: |
| * -1ULL ==> "16384 EB" */ |
| static char units[] = { 'K', 'M', 'G', 'T', 'P', 'E' }; |
| int base = 0; |
| while (size >= 10000 && base < sizeof(units)-1) { |
| /* shift + round */ |
| size = (size >> 10) + !!(size & (1<<9)); |
| base++; |
| } |
| sprintf(buf, "%u %cB", (unsigned)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); |
| if (is_susp(mdev->state)) |
| return; |
| 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_determine_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) { |
| int err; |
| |
| 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"); |
| /* next line implicitly does drbd_suspend_io()+drbd_resume_io() */ |
| err = drbd_bitmap_io(mdev, &drbd_bm_write, |
| "size changed", BM_LOCKED_MASK); |
| if (err) { |
| rv = dev_size_error; |
| goto out; |
| } |
| 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; |
| |
| if (!expect(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, 1, |
| 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; |
| } |
| |
| static void drbd_setup_queue_param(struct drbd_conf *mdev, unsigned int max_bio_size) |
| { |
| struct request_queue * const q = mdev->rq_queue; |
| int max_hw_sectors = max_bio_size >> 9; |
| int max_segments = 0; |
| |
| if (get_ldev_if_state(mdev, D_ATTACHING)) { |
| 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; |
| put_ldev(mdev); |
| } |
| |
| blk_queue_logical_block_size(q, 512); |
| blk_queue_max_hw_sectors(q, max_hw_sectors); |
| /* This is the workaround for "bio would need to, but cannot, be split" */ |
| blk_queue_max_segments(q, max_segments ? max_segments : BLK_MAX_SEGMENTS); |
| blk_queue_segment_boundary(q, PAGE_CACHE_SIZE-1); |
| |
| if (get_ldev_if_state(mdev, D_ATTACHING)) { |
| struct request_queue * const b = mdev->ldev->backing_bdev->bd_disk->queue; |
| |
| blk_queue_stack_limits(q, b); |
| |
| 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; |
| } |
| put_ldev(mdev); |
| } |
| } |
| |
| void drbd_reconsider_max_bio_size(struct drbd_conf *mdev) |
| { |
| int now, new, local, peer; |
| |
| now = queue_max_hw_sectors(mdev->rq_queue) << 9; |
| local = mdev->local_max_bio_size; /* Eventually last known value, from volatile memory */ |
| peer = mdev->peer_max_bio_size; /* Eventually last known value, from meta data */ |
| |
| if (get_ldev_if_state(mdev, D_ATTACHING)) { |
| local = queue_max_hw_sectors(mdev->ldev->backing_bdev->bd_disk->queue) << 9; |
| mdev->local_max_bio_size = local; |
| put_ldev(mdev); |
| } |
| |
| /* We may ignore peer limits if the peer is modern enough. |
| Because new from 8.3.8 onwards the peer can use multiple |
| BIOs for a single peer_request */ |
| if (mdev->state.conn >= C_CONNECTED) { |
| if (mdev->tconn->agreed_pro_version < 94) |
| peer = mdev->peer_max_bio_size; |
| else if (mdev->tconn->agreed_pro_version == 94) |
| peer = DRBD_MAX_SIZE_H80_PACKET; |
| else /* drbd 8.3.8 onwards */ |
| peer = DRBD_MAX_BIO_SIZE; |
| } |
| |
| new = min_t(int, local, peer); |
| |
| if (mdev->state.role == R_PRIMARY && new < now) |
| dev_err(DEV, "ASSERT FAILED new < now; (%d < %d)\n", new, now); |
| |
| if (new != now) |
| dev_info(DEV, "max BIO size = %u\n", new); |
| |
| drbd_setup_queue_param(mdev, new); |
| } |
| |
| /* 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. Flush any pending work, there may still be an |
| * after_state_change queued. |
| */ |
| 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->tconn->worker); |
| drbd_flush_workqueue(mdev); |
| } |
| |
| /* 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->tconn->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->tconn->worker); |
| } else |
| clear_bit(CONFIG_PENDING, &mdev->flags); |
| spin_unlock_irq(&mdev->tconn->req_lock); |
| wake_up(&mdev->state_wait); |
| } |
| |
| /* Make sure IO is suspended before calling this function(). */ |
| static void drbd_suspend_al(struct drbd_conf *mdev) |
| { |
| int s = 0; |
| |
| if (!lc_try_lock(mdev->act_log)) { |
| dev_warn(DEV, "Failed to lock al in drbd_suspend_al()\n"); |
| return; |
| } |
| |
| drbd_al_shrink(mdev); |
| spin_lock_irq(&mdev->tconn->req_lock); |
| if (mdev->state.conn < C_CONNECTED) |
| s = !test_and_set_bit(AL_SUSPENDED, &mdev->flags); |
| spin_unlock_irq(&mdev->tconn->req_lock); |
| lc_unlock(mdev->act_log); |
| |
| if (s) |
| dev_info(DEV, "Suspended AL updates\n"); |
| } |
| |
| /* 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_code 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 block_device *bdev; |
| struct lru_cache *resync_lru = NULL; |
| union drbd_state ns, os; |
| enum drbd_state_rv 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; |
| } |
| /* It may just now have detached because of IO error. Make sure |
| * drbd_ldev_destroy is done already, we may end up here very fast, |
| * e.g. if someone calls attach from the on-io-error handler, |
| * to realize a "hot spare" feature (not that I'd recommend that) */ |
| wait_event(mdev->misc_wait, !atomic_read(&mdev->local_cnt)); |
| |
| /* 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; |
| } |
| |
| if (get_net_conf(mdev->tconn)) { |
| int prot = mdev->tconn->net_conf->wire_protocol; |
| put_net_conf(mdev->tconn); |
| if (nbc->dc.fencing == FP_STONITH && prot == DRBD_PROT_A) { |
| retcode = ERR_STONITH_AND_PROT_A; |
| goto fail; |
| } |
| } |
| |
| bdev = blkdev_get_by_path(nbc->dc.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, |
| PTR_ERR(bdev)); |
| retcode = ERR_OPEN_DISK; |
| goto fail; |
| } |
| nbc->backing_bdev = bdev; |
| |
| /* |
| * 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) |
| */ |
| bdev = blkdev_get_by_path(nbc->dc.meta_dev, |
| FMODE_READ | FMODE_WRITE | FMODE_EXCL, |
| (nbc->dc.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, |
| PTR_ERR(bdev)); |
| retcode = ERR_OPEN_MD_DISK; |
| goto fail; |
| } |
| 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)) { |
| retcode = ERR_MD_IDX_INVALID; |
| goto fail; |
| } |
| |
| resync_lru = lc_create("resync", drbd_bm_ext_cache, |
| 1, 61, sizeof(struct bm_extent), |
| offsetof(struct bm_extent, lce)); |
| if (!resync_lru) { |
| retcode = ERR_NOMEM; |
| goto 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 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 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 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) || is_susp(mdev->state)); |
| /* and for any other previously queued work */ |
| drbd_flush_workqueue(mdev); |
| |
| rv = _drbd_request_state(mdev, NS(disk, D_ATTACHING), CS_VERBOSE); |
| retcode = rv; /* FIXME: Type mismatch. */ |
| drbd_resume_io(mdev); |
| if (rv < SS_SUCCESS) |
| goto 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_FUA, &mdev->flags); |
| else |
| clear_bit(MD_NO_FUA, &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_bdev_flush; |
| drbd_bump_write_ordering(mdev, WO_bdev_flush); |
| |
| 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) && |
| !(mdev->state.role == R_PRIMARY && mdev->state.susp_nod)) { |
| 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_reconsider_max_bio_size(mdev); |
| |
| /* 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_determine_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", BM_LOCKED_MASK)) { |
| retcode = ERR_IO_MD_DISK; |
| goto force_diskless_dec; |
| } |
| } else { |
| if (drbd_bitmap_io(mdev, &drbd_bm_read, |
| "read from attaching", BM_LOCKED_MASK) < 0) { |
| retcode = ERR_IO_MD_DISK; |
| goto force_diskless_dec; |
| } |
| } |
| |
| if (cp_discovered) { |
| drbd_al_apply_to_bm(mdev); |
| if (drbd_bitmap_io(mdev, &drbd_bm_write, |
| "crashed primary apply AL", BM_LOCKED_MASK)) { |
| retcode = ERR_IO_MD_DISK; |
| goto force_diskless_dec; |
| } |
| } |
| |
| if (_drbd_bm_total_weight(mdev) == drbd_bm_bits(mdev)) |
| drbd_suspend_al(mdev); /* IO is still suspended here... */ |
| |
| spin_lock_irq(&mdev->tconn->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->tconn->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_FAILED)); |
| drbd_md_sync(mdev); |
| fail: |
| if (nbc) { |
| if (nbc->backing_bdev) |
| blkdev_put(nbc->backing_bdev, |
| FMODE_READ | FMODE_WRITE | FMODE_EXCL); |
| if (nbc->md_bdev) |
| blkdev_put(nbc->md_bdev, |
| FMODE_READ | FMODE_WRITE | FMODE_EXCL); |
| kfree(nbc); |
| } |
| lc_destroy(resync_lru); |
| |
| reply->ret_code = retcode; |
| drbd_reconfig_done(mdev); |
| return 0; |
| } |
| |
| /* Detaching the disk is a process in multiple stages. First we need to lock |
| * out application IO, in-flight IO, IO stuck in drbd_al_begin_io. |
| * Then we transition to D_DISKLESS, and wait for put_ldev() to return all |
| * internal references as well. |
| * Only then we have finally detached. */ |
| static int drbd_nl_detach(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, |
| struct drbd_nl_cfg_reply *reply) |
| { |
| enum drbd_ret_code retcode; |
| int ret; |
| drbd_suspend_io(mdev); /* so no-one is stuck in drbd_al_begin_io */ |
| retcode = drbd_request_state(mdev, NS(disk, D_FAILED)); |
| /* D_FAILED will transition to DISKLESS. */ |
| ret = wait_event_interruptible(mdev->misc_wait, |
| mdev->state.disk != D_FAILED); |
| drbd_resume_io(mdev); |
| if ((int)retcode == (int)SS_IS_DISKLESS) |
| retcode = SS_NOTHING_TO_DO; |
| if (ret) |
| retcode = ERR_INTR; |
| reply->ret_code = retcode; |
| 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; |
| enum drbd_ret_code 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 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; |
| new_conf->on_congestion = DRBD_ON_CONGESTION_DEF; |
| new_conf->cong_extents = DRBD_CONG_EXTENTS_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 (get_ldev(mdev)) { |
| enum drbd_fencing_p fp = mdev->ldev->dc.fencing; |
| put_ldev(mdev); |
| if (new_conf->wire_protocol == DRBD_PROT_A && fp == FP_STONITH) { |
| retcode = ERR_STONITH_AND_PROT_A; |
| goto fail; |
| } |
| } |
| |
| if (new_conf->on_congestion != OC_BLOCK && new_conf->wire_protocol != DRBD_PROT_A) { |
| retcode = ERR_CONG_NOT_PROTO_A; |
| 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->tconn)) { |
| taken_addr = (struct sockaddr *)&odev->tconn->net_conf->my_addr; |
| if (new_conf->my_addr_len == odev->tconn->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->tconn->net_conf->peer_addr; |
| if (new_conf->peer_addr_len == odev->tconn->net_conf->peer_addr_len && |
| !memcmp(new_peer_addr, taken_addr, new_conf->peer_addr_len)) |
| retcode = ERR_PEER_ADDR; |
| |
| put_net_conf(odev->tconn); |
| 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; |
| } |
| } |
| |
| ((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; |
| } |
| } |
| |
| drbd_flush_workqueue(mdev); |
| spin_lock_irq(&mdev->tconn->req_lock); |
| if (mdev->tconn->net_conf != NULL) { |
| retcode = ERR_NET_CONFIGURED; |
| spin_unlock_irq(&mdev->tconn->req_lock); |
| goto fail; |
| } |
| mdev->tconn->net_conf = new_conf; |
| |
| mdev->send_cnt = 0; |
| mdev->recv_cnt = 0; |
| |
| crypto_free_hash(mdev->tconn->cram_hmac_tfm); |
| mdev->tconn->cram_hmac_tfm = tfm; |
| |
| crypto_free_hash(mdev->tconn->integrity_w_tfm); |
| mdev->tconn->integrity_w_tfm = integrity_w_tfm; |
| |
| crypto_free_hash(mdev->tconn->integrity_r_tfm); |
| mdev->tconn->integrity_r_tfm = integrity_r_tfm; |
| |
| kfree(mdev->tconn->int_dig_out); |
| kfree(mdev->tconn->int_dig_in); |
| kfree(mdev->tconn->int_dig_vv); |
| mdev->tconn->int_dig_out=int_dig_out; |
| mdev->tconn->int_dig_in=int_dig_in; |
| mdev->tconn->int_dig_vv=int_dig_vv; |
| retcode = _conn_request_state(mdev->tconn, NS(conn, C_UNCONNECTED), CS_VERBOSE); |
| spin_unlock_irq(&mdev->tconn->req_lock); |
| |
| 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_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) |
| { |
| struct drbd_tconn *tconn = mdev->tconn; |
| int retcode; |
| struct disconnect dc; |
| |
| memset(&dc, 0, sizeof(struct disconnect)); |
| if (!disconnect_from_tags(mdev, nlp->tag_list, &dc)) { |
| retcode = ERR_MANDATORY_TAG; |
| goto fail; |
| } |
| |
| if (dc.force) { |
| spin_lock_irq(&tconn->req_lock); |
| if (tconn->cstate >= C_WF_CONNECTION) |
| _conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); |
| spin_unlock_irq(&tconn->req_lock); |
| goto done; |
| } |
| |
| retcode = conn_request_state(tconn, NS(conn, C_DISCONNECTING), 0); |
| |
| if (retcode == SS_NOTHING_TO_DO) |
| goto done; |
| else if (retcode == SS_ALREADY_STANDALONE) |
| goto done; |
| else if (retcode == SS_PRIMARY_NOP) { |
| /* Our state checking code wants to see the peer outdated. */ |
| retcode = conn_request_state(tconn, NS2(conn, C_DISCONNECTING, |
| pdsk, D_OUTDATED), CS_VERBOSE); |
| } else if (retcode == SS_CW_FAILED_BY_PEER) { |
| /* The peer probably wants to see us outdated. */ |
| retcode = conn_request_state(tconn, NS2(conn, C_DISCONNECTING, |
| disk, D_OUTDATED), 0); |
| if (retcode == SS_IS_DISKLESS || retcode == SS_LOWER_THAN_OUTDATED) { |
| conn_request_state(tconn, NS(conn, C_DISCONNECTING), CS_HARD); |
| retcode = SS_SUCCESS; |
| } |
| } |
| |
| if (retcode < SS_SUCCESS) |
| goto fail; |
| |
| if (wait_event_interruptible(tconn->ping_wait, |
| tconn->cstate != 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->tconn->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->tconn->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_determine_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; |
| int *rs_plan_s = NULL; |
| int fifo_size; |
| |
| 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; |
| sc.on_no_data = DRBD_ON_NO_DATA_DEF; |
| sc.c_plan_ahead = DRBD_C_PLAN_AHEAD_DEF; |
| sc.c_delay_target = DRBD_C_DELAY_TARGET_DEF; |
| sc.c_fill_target = DRBD_C_FILL_TARGET_DEF; |
| sc.c_max_rate = DRBD_C_MAX_RATE_DEF; |
| sc.c_min_rate = DRBD_C_MIN_RATE_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; |
| } |
| } |
| |
| if (!expect(sc.rate >= 1)) |
| sc.rate = 1; |
| if (!expect(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 |
| |
| /* to avoid spurious errors when configuring minors before configuring |
| * the minors they depend on: if necessary, first create the minor we |
| * depend on */ |
| if (sc.after >= 0) |
| ensure_mdev(sc.after, 1); |
| |
| /* 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; |
| |
| fifo_size = (sc.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) { |
| dev_err(DEV, "kmalloc of fifo_buffer failed"); |
| retcode = ERR_NOMEM; |
| 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; |
| } |
| |
| 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; |
| rs_plan_s = 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->tconn->cpu_mask, new_cpu_mask)) { |
| cpumask_copy(mdev->tconn->cpu_mask, new_cpu_mask); |
| drbd_calc_cpu_mask(mdev->tconn); |
| mdev->tconn->receiver.reset_cpu_mask = 1; |
| mdev->tconn->asender.reset_cpu_mask = 1; |
| mdev->tconn->worker.reset_cpu_mask = 1; |
| } |
| |
| kobject_uevent(&disk_to_dev(mdev->vdisk)->kobj, KOBJ_CHANGE); |
| fail: |
| kfree(rs_plan_s); |
| 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; |
| |
| /* If there is still bitmap IO pending, probably because of a previous |
| * resync just being finished, wait for it before requesting a new resync. */ |
| wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags)); |
| |
| 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->tconn->req_lock); |
| if (mdev->state.conn < C_CONNECTED) |
| retcode = _drbd_set_state(_NS(mdev, disk, D_INCONSISTENT), CS_VERBOSE, NULL); |
| spin_unlock_irq(&mdev->tconn->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_bmio_set_susp_al(struct drbd_conf *mdev) |
| { |
| int rv; |
| |
| rv = drbd_bmio_set_n_write(mdev); |
| drbd_suspend_al(mdev); |
| return rv; |
| } |
| |
| static int drbd_nl_invalidate_peer(struct drbd_conf *mdev, struct drbd_nl_cfg_req *nlp, |
| struct drbd_nl_cfg_reply *reply) |
| { |
| int retcode; |
| |
| /* If there is still bitmap IO pending, probably because of a previous |
| * resync just being finished, wait for it before requesting a new resync. */ |
| wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags)); |
| |
| retcode = _drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S), CS_ORDERED); |
| |
| if (retcode < SS_SUCCESS) { |
| if (retcode == SS_NEED_CONNECTION && mdev->state.role == R_PRIMARY) { |
| /* The peer will get a resync upon connect anyways. Just make that |
| into a full resync. */ |
| retcode = drbd_request_state(mdev, NS(pdsk, D_INCONSISTENT)); |
| if (retcode >= SS_SUCCESS) { |
| if (drbd_bitmap_io(mdev, &drbd_bmio_set_susp_al, |
| "set_n_write from invalidate_peer", |
| BM_LOCKED_SET_ALLOWED)) |
| retcode = ERR_IO_MD_DISK; |
| } |
| } else |
| retcode = drbd_request_state(mdev, NS(conn, C_STARTING_SYNC_S)); |
| } |
| |
| reply->ret_code = retcode; |
| 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; |
| union drbd_state s; |
| |
| if (drbd_request_state(mdev, NS(user_isp, 0)) == SS_NOTHING_TO_DO) { |
| s = mdev->state; |
| if (s.conn == C_PAUSED_SYNC_S || s.conn == C_PAUSED_SYNC_T) { |
| retcode = s.aftr_isp ? ERR_PIC_AFTER_DEP : |
| s.peer_isp ? ERR_PIC_PEER_DEP : ERR_PAUSE_IS_CLEAR; |
| } else { |
| 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) |
| { |
| if (test_bit(NEW_CUR_UUID, &mdev->flags)) { |
| drbd_uuid_new_current(mdev); |
| clear_bit(NEW_CUR_UUID, &mdev->flags); |
| } |
| drbd_suspend_io(mdev); |
| reply->ret_code = drbd_request_state(mdev, NS3(susp, 0, susp_nod, 0, susp_fen, 0)); |
| if (reply->ret_code == SS_SUCCESS) { |
| if (mdev->state.conn < C_CONNECTED) |
| tl_clear(mdev); |
| if (mdev->state.disk == D_DISKLESS || mdev->state.disk == D_FAILED) |
| tl_restart(mdev, FAIL_FROZEN_DISK_IO); |
| } |
| drbd_resume_io(mdev); |
| |
| 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->tconn)) { |
| tl = net_conf_to_tags(mdev, mdev->tconn->net_conf, tl); |
| put_net_conf(mdev->tconn); |
| } |
| 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; |
| } |
| |
| /* If there is still bitmap IO pending, e.g. previous resync or verify |
| * just being finished, wait for it before requesting a new resync. */ |
| wait_event(mdev->misc_wait, !test_bit(BITMAP_IO, &mdev->flags)); |
| |
| /* 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->tconn->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", BM_LOCKED_MASK); |
| 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); |
| drbd_print_uuids(mdev, "cleared bitmap UUID"); |
| spin_lock_irq(&mdev->tconn->req_lock); |
| _drbd_set_state(_NS2(mdev, disk, D_UP_TO_DATE, pdsk, D_UP_TO_DATE), |
| CS_VERBOSE, NULL); |
| spin_unlock_irq(&mdev->tconn->req_lock); |
| } |
| } |
| |
| drbd_md_sync(mdev); |
| out_dec: |
| put_ldev(mdev); |
| out: |
| mutex_unlock(mdev->state_mutex); |
| |
| reply->ret_code = retcode; |
| return 0; |
| } |
| |
| 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(current_cap(), CAP_SYS_ADMIN)) { |
| retcode = ERR_PERM; |
| goto fail; |
| } |
| |
| mdev = ensure_mdev(nlp->drbd_minor, |
| (nlp->flags & DRBD_NL_CREATE_DEVICE)); |
| if (!mdev) { |
| retcode = ERR_MINOR_INVALID; |
| goto fail; |
| } |
| |
| if (nlp->packet_type >= P_nl_after_last_packet || |
| nlp->packet_type == P_return_code_only) { |
| 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 = kzalloc(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_return_code_only; |
| 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_peer_request *peer_req) |
| { |
| struct cn_msg *cn_reply; |
| struct drbd_nl_cfg_reply *reply; |
| unsigned short *tl; |
| struct page *page; |
| unsigned len; |
| |
| if (!peer_req) |
| 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 = kzalloc( |
| 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)peer_req->i.sector, |
| peer_req->i.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, &peer_req->i.sector); |
| tl = tl_add_int(tl, T_ee_block_id, &peer_req->block_id); |
| |
| /* dump the first 32k */ |
| len = min_t(unsigned, peer_req->i.size, 32 << 10); |
| put_unaligned(T_ee_data, tl++); |
| put_unaligned(len, tl++); |
| |
| page = peer_req->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; |
| if (len == 0) |
| break; |
| } |
| 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; |
| |
| memset(buffer, 0, sizeof(buffer)); |
| 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->packet_type = P_return_code_only; |
| 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); |
| } |
| |