4 This file is part of DRBD by Philipp Reisner and Lars Ellenberg.
6 Copyright (C) 2001-2008, LINBIT Information Technologies GmbH.
7 Copyright (C) 1999-2008, Philipp Reisner <philipp.reisner@linbit.com>.
8 Copyright (C) 2002-2008, Lars Ellenberg <lars.ellenberg@linbit.com>.
10 drbd is free software; you can redistribute it and/or modify
11 it under the terms of the GNU General Public License as published by
12 the Free Software Foundation; either version 2, or (at your option)
15 drbd is distributed in the hope that it will be useful,
16 but WITHOUT ANY WARRANTY; without even the implied warranty of
17 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18 GNU General Public License for more details.
20 You should have received a copy of the GNU General Public License
21 along with drbd; see the file COPYING. If not, write to
22 the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
29 #include <linux/compiler.h>
30 #include <linux/types.h>
31 #include <linux/version.h>
32 #include <linux/list.h>
33 #include <linux/sched.h>
34 #include <linux/bitops.h>
35 #include <linux/slab.h>
36 #include <linux/crypto.h>
37 #include <linux/ratelimit.h>
38 #include <linux/tcp.h>
39 #include <linux/mutex.h>
40 #include <linux/major.h>
41 #include <linux/blkdev.h>
42 #include <linux/genhd.h>
44 #include <linux/lru_cache.h>
47 # define __protected_by(x) __attribute__((require_context(x,1,999,"rdwr")))
48 # define __protected_read_by(x) __attribute__((require_context(x,1,999,"read")))
49 # define __protected_write_by(x) __attribute__((require_context(x,1,999,"write")))
50 # define __must_hold(x) __attribute__((context(x,1,1), require_context(x,1,999,"call")))
52 # define __protected_by(x)
53 # define __protected_read_by(x)
54 # define __protected_write_by(x)
55 # define __must_hold(x)
58 #define __no_warn(lock, stmt) do { __acquire(lock); stmt; __release(lock); } while (0)
60 /* module parameter, defined in drbd_main.c */
61 extern unsigned int minor_count
;
62 extern int disable_sendpage
;
64 extern unsigned int cn_idx
;
66 #ifdef CONFIG_DRBD_FAULT_INJECTION
67 extern int enable_faults
;
68 extern int fault_rate
;
69 extern int fault_devs
;
72 extern char usermode_helper
[];
82 /* I don't remember why XCPU ...
83 * This is used to wake the asender,
84 * and to interrupt sending the sending task
87 #define DRBD_SIG SIGXCPU
89 /* This is used to stop/restart our threads.
90 * Cannot use SIGTERM nor SIGKILL, since these
91 * are sent out by init on runlevel changes
92 * I choose SIGHUP for now.
94 #define DRBD_SIGKILL SIGHUP
96 /* All EEs on the free list should have ID_VACANT (== 0)
97 * freshly allocated EEs get !ID_VACANT (== 1)
98 * so if it says "cannot dereference null pointer at adress 0x00000001",
99 * it is most likely one of these :( */
101 #define ID_IN_SYNC (4711ULL)
102 #define ID_OUT_OF_SYNC (4712ULL)
104 #define ID_SYNCER (-1ULL)
106 #define is_syncer_block_id(id) ((id) == ID_SYNCER)
111 /* to shorten dev_warn(DEV, "msg"); and relatives statements */
112 #define DEV (disk_to_dev(mdev->vdisk))
114 #define D_ASSERT(exp) if (!(exp)) \
115 dev_err(DEV, "ASSERT( " #exp " ) in %s:%d\n", __FILE__, __LINE__)
117 #define ERR_IF(exp) if (({ \
118 int _b = (exp) != 0; \
119 if (_b) dev_err(DEV, "%s: (%s) in %s:%d\n", \
120 __func__, #exp, __FILE__, __LINE__); \
124 /* Defines to control fault insertion */
126 DRBD_FAULT_MD_WR
= 0, /* meta data write */
127 DRBD_FAULT_MD_RD
= 1, /* read */
128 DRBD_FAULT_RS_WR
= 2, /* resync */
129 DRBD_FAULT_RS_RD
= 3,
130 DRBD_FAULT_DT_WR
= 4, /* data */
131 DRBD_FAULT_DT_RD
= 5,
132 DRBD_FAULT_DT_RA
= 6, /* data read ahead */
133 DRBD_FAULT_BM_ALLOC
= 7, /* bitmap allocation */
134 DRBD_FAULT_AL_EE
= 8, /* alloc ee */
139 #ifdef CONFIG_DRBD_FAULT_INJECTION
141 _drbd_insert_fault(struct drbd_conf
*mdev
, unsigned int type
);
143 drbd_insert_fault(struct drbd_conf
*mdev
, unsigned int type
) {
145 (enable_faults
& (1<<type
)) &&
146 _drbd_insert_fault(mdev
, type
);
148 #define FAULT_ACTIVE(_m, _t) (drbd_insert_fault((_m), (_t)))
151 #define FAULT_ACTIVE(_m, _t) (0)
154 /* integer division, round _UP_ to the next integer */
155 #define div_ceil(A, B) ((A)/(B) + ((A)%(B) ? 1 : 0))
156 /* usual integer division */
157 #define div_floor(A, B) ((A)/(B))
159 /* drbd_meta-data.c (still in drbd_main.c) */
160 /* 4th incarnation of the disk layout. */
161 #define DRBD_MD_MAGIC (DRBD_MAGIC+4)
163 extern struct drbd_conf
**minor_table
;
164 extern struct ratelimit_state drbd_ratelimit_state
;
168 /* receiver (data socket) */
170 P_DATA_REPLY
= 0x01, /* Response to P_DATA_REQUEST */
171 P_RS_DATA_REPLY
= 0x02, /* Response to P_RS_DATA_REQUEST */
174 P_BECOME_SYNC_TARGET
= 0x05,
175 P_BECOME_SYNC_SOURCE
= 0x06,
176 P_UNPLUG_REMOTE
= 0x07, /* Used at various times to hint the peer */
177 P_DATA_REQUEST
= 0x08, /* Used to ask for a data block */
178 P_RS_DATA_REQUEST
= 0x09, /* Used to ask for a data block for resync */
185 P_AUTH_CHALLENGE
= 0x10,
186 P_AUTH_RESPONSE
= 0x11,
187 P_STATE_CHG_REQ
= 0x12,
189 /* asender (meta socket */
192 P_RECV_ACK
= 0x15, /* Used in protocol B */
193 P_WRITE_ACK
= 0x16, /* Used in protocol C */
194 P_RS_WRITE_ACK
= 0x17, /* Is a P_WRITE_ACK, additionally call set_in_sync(). */
195 P_DISCARD_ACK
= 0x18, /* Used in proto C, two-primaries conflict detection */
196 P_NEG_ACK
= 0x19, /* Sent if local disk is unusable */
197 P_NEG_DREPLY
= 0x1a, /* Local disk is broken... */
198 P_NEG_RS_DREPLY
= 0x1b, /* Local disk is broken... */
199 P_BARRIER_ACK
= 0x1c,
200 P_STATE_CHG_REPLY
= 0x1d,
202 /* "new" commands, no longer fitting into the ordering scheme above */
204 P_OV_REQUEST
= 0x1e, /* data socket */
206 P_OV_RESULT
= 0x20, /* meta socket */
207 P_CSUM_RS_REQUEST
= 0x21, /* data socket */
208 P_RS_IS_IN_SYNC
= 0x22, /* meta socket */
209 P_SYNC_PARAM89
= 0x23, /* data socket, protocol version 89 replacement for P_SYNC_PARAM */
210 P_COMPRESSED_BITMAP
= 0x24, /* compressed or otherwise encoded bitmap transfer */
213 P_MAY_IGNORE
= 0x100, /* Flag to test if (cmd > P_MAY_IGNORE) ... */
214 P_MAX_OPT_CMD
= 0x101,
216 /* special command ids for handshake */
218 P_HAND_SHAKE_M
= 0xfff1, /* First Packet on the MetaSock */
219 P_HAND_SHAKE_S
= 0xfff2, /* First Packet on the Socket */
221 P_HAND_SHAKE
= 0xfffe /* FIXED for the next century! */
224 static inline const char *cmdname(enum drbd_packets cmd
)
226 /* THINK may need to become several global tables
227 * when we want to support more than
229 static const char *cmdnames
[] = {
231 [P_DATA_REPLY
] = "DataReply",
232 [P_RS_DATA_REPLY
] = "RSDataReply",
233 [P_BARRIER
] = "Barrier",
234 [P_BITMAP
] = "ReportBitMap",
235 [P_BECOME_SYNC_TARGET
] = "BecomeSyncTarget",
236 [P_BECOME_SYNC_SOURCE
] = "BecomeSyncSource",
237 [P_UNPLUG_REMOTE
] = "UnplugRemote",
238 [P_DATA_REQUEST
] = "DataRequest",
239 [P_RS_DATA_REQUEST
] = "RSDataRequest",
240 [P_SYNC_PARAM
] = "SyncParam",
241 [P_SYNC_PARAM89
] = "SyncParam89",
242 [P_PROTOCOL
] = "ReportProtocol",
243 [P_UUIDS
] = "ReportUUIDs",
244 [P_SIZES
] = "ReportSizes",
245 [P_STATE
] = "ReportState",
246 [P_SYNC_UUID
] = "ReportSyncUUID",
247 [P_AUTH_CHALLENGE
] = "AuthChallenge",
248 [P_AUTH_RESPONSE
] = "AuthResponse",
250 [P_PING_ACK
] = "PingAck",
251 [P_RECV_ACK
] = "RecvAck",
252 [P_WRITE_ACK
] = "WriteAck",
253 [P_RS_WRITE_ACK
] = "RSWriteAck",
254 [P_DISCARD_ACK
] = "DiscardAck",
255 [P_NEG_ACK
] = "NegAck",
256 [P_NEG_DREPLY
] = "NegDReply",
257 [P_NEG_RS_DREPLY
] = "NegRSDReply",
258 [P_BARRIER_ACK
] = "BarrierAck",
259 [P_STATE_CHG_REQ
] = "StateChgRequest",
260 [P_STATE_CHG_REPLY
] = "StateChgReply",
261 [P_OV_REQUEST
] = "OVRequest",
262 [P_OV_REPLY
] = "OVReply",
263 [P_OV_RESULT
] = "OVResult",
267 if (cmd
== P_HAND_SHAKE_M
)
269 if (cmd
== P_HAND_SHAKE_S
)
271 if (cmd
== P_HAND_SHAKE
)
273 if (cmd
>= P_MAX_CMD
)
275 return cmdnames
[cmd
];
278 /* for sending/receiving the bitmap,
279 * possibly in some encoding scheme */
282 * stores total bits and long words
283 * of the bitmap, so we don't need to
284 * call the accessor functions over and again. */
285 unsigned long bm_bits
;
286 unsigned long bm_words
;
287 /* during xfer, current position within the bitmap */
288 unsigned long bit_offset
;
289 unsigned long word_offset
;
291 /* statistics; index: (h->command == P_BITMAP) */
296 extern void INFO_bm_xfer_stats(struct drbd_conf
*mdev
,
297 const char *direction
, struct bm_xfer_ctx
*c
);
299 static inline void bm_xfer_ctx_bit_to_word_offset(struct bm_xfer_ctx
*c
)
301 /* word_offset counts "native long words" (32 or 64 bit),
303 * Encoded packet may end at an unaligned bit offset.
304 * In case a fallback clear text packet is transmitted in
305 * between, we adjust this offset back to the last 64bit
306 * aligned "native long word", which makes coding and decoding
307 * the plain text bitmap much more convenient. */
308 #if BITS_PER_LONG == 64
309 c
->word_offset
= c
->bit_offset
>> 6;
310 #elif BITS_PER_LONG == 32
311 c
->word_offset
= c
->bit_offset
>> 5;
312 c
->word_offset
&= ~(1UL);
314 # error "unsupported BITS_PER_LONG"
319 #define __packed __attribute__((packed))
322 /* This is the layout for a packet on the wire.
323 * The byteorder is the network byte order.
324 * (except block_id and barrier fields.
325 * these are pointers to local structs
326 * and have no relevance for the partner,
327 * which just echoes them as received.)
329 * NOTE that the payload starts at a long aligned offset,
330 * regardless of 32 or 64 bit arch!
335 u16 length
; /* bytes of data after this header */
338 /* 8 bytes. packet FIXED for the next century! */
341 * short commands, packets without payload, plain p_header:
344 * P_BECOME_SYNC_TARGET
345 * P_BECOME_SYNC_SOURCE
350 * commands with out-of-struct payload:
351 * P_BITMAP (no additional fields)
352 * P_DATA, P_DATA_REPLY (see p_data)
353 * P_COMPRESSED_BITMAP (see receive_compressed_bitmap)
356 /* these defines must not be changed without changing the protocol version */
357 #define DP_HARDBARRIER 1
359 #define DP_MAY_SET_IN_SYNC 4
362 struct p_header head
;
363 u64 sector
; /* 64 bits sector number */
364 u64 block_id
; /* to identify the request in protocol B&C */
370 * commands which share a struct:
372 * P_RECV_ACK (proto B), P_WRITE_ACK (proto C),
373 * P_DISCARD_ACK (proto C, two-primaries conflict detection)
375 * P_DATA_REQUEST, P_RS_DATA_REQUEST
378 struct p_header head
;
387 struct p_header head
;
391 u32 pad
; /* to multiple of 8 Byte */
395 * commands with their own struct for additional fields:
404 struct p_header head
; /* 8 bytes */
409 /* should be more than enough for future enhancements
410 * for now, feature_flags and the reserverd array shall be zero.
416 /* 80 bytes, FIXED for the next century */
419 struct p_header head
;
420 u32 barrier
; /* barrier number _handle_ only */
421 u32 pad
; /* to multiple of 8 Byte */
424 struct p_barrier_ack
{
425 struct p_header head
;
431 struct p_header head
;
434 /* Since protocol version 88 and higher. */
438 struct p_rs_param_89
{
439 struct p_header head
;
441 /* protocol version 89: */
442 char verify_alg
[SHARED_SECRET_MAX
];
443 char csums_alg
[SHARED_SECRET_MAX
];
447 struct p_header head
;
455 /* Since protocol version 87 and higher. */
456 char integrity_alg
[0];
461 struct p_header head
;
462 u64 uuid
[UI_EXTENDED_SIZE
];
466 struct p_header head
;
471 struct p_header head
;
472 u64 d_size
; /* size of disk */
473 u64 u_size
; /* user requested size */
474 u64 c_size
; /* current exported size */
475 u32 max_segment_size
; /* Maximal size of a BIO */
476 u32 queue_order_type
;
480 struct p_header head
;
485 struct p_header head
;
490 struct p_req_state_reply
{
491 struct p_header head
;
495 struct p_drbd06_param
{
506 struct p_header head
;
512 /* Valid values for the encoding field.
513 * Bump proto version when changing this. */
514 enum drbd_bitmap_code
{
515 /* RLE_VLI_Bytes = 0,
516 * and other bit variants had been defined during
517 * algorithm evaluation. */
521 struct p_compressed_bm
{
522 struct p_header head
;
523 /* (encoding & 0x0f): actual encoding, see enum drbd_bitmap_code
524 * (encoding & 0x80): polarity (set/unset) of first runlength
525 * ((encoding >> 4) & 0x07): pad_bits, number of trailing zero bits
526 * used to pad up to head.length bytes
533 /* DCBP: Drbd Compressed Bitmap Packet ... */
534 static inline enum drbd_bitmap_code
535 DCBP_get_code(struct p_compressed_bm
*p
)
537 return (enum drbd_bitmap_code
)(p
->encoding
& 0x0f);
541 DCBP_set_code(struct p_compressed_bm
*p
, enum drbd_bitmap_code code
)
544 p
->encoding
= (p
->encoding
& ~0xf) | code
;
548 DCBP_get_start(struct p_compressed_bm
*p
)
550 return (p
->encoding
& 0x80) != 0;
554 DCBP_set_start(struct p_compressed_bm
*p
, int set
)
556 p
->encoding
= (p
->encoding
& ~0x80) | (set
? 0x80 : 0);
560 DCBP_get_pad_bits(struct p_compressed_bm
*p
)
562 return (p
->encoding
>> 4) & 0x7;
566 DCBP_set_pad_bits(struct p_compressed_bm
*p
, int n
)
569 p
->encoding
= (p
->encoding
& (~0x7 << 4)) | (n
<< 4);
572 /* one bitmap packet, including the p_header,
573 * should fit within one _architecture independend_ page.
574 * so we need to use the fixed size 4KiB page size
575 * most architechtures have used for a long time.
577 #define BM_PACKET_PAYLOAD_BYTES (4096 - sizeof(struct p_header))
578 #define BM_PACKET_WORDS (BM_PACKET_PAYLOAD_BYTES/sizeof(long))
579 #define BM_PACKET_VLI_BYTES_MAX (4096 - sizeof(struct p_compressed_bm))
580 #if (PAGE_SIZE < 4096)
581 /* drbd_send_bitmap / receive_bitmap would break horribly */
582 #error "PAGE_SIZE too small"
586 struct p_header header
;
587 struct p_handshake handshake
;
589 struct p_block_ack block_ack
;
590 struct p_barrier barrier
;
591 struct p_barrier_ack barrier_ack
;
592 struct p_rs_param_89 rs_param_89
;
593 struct p_protocol protocol
;
594 struct p_sizes sizes
;
595 struct p_uuids uuids
;
596 struct p_state state
;
597 struct p_req_state req_state
;
598 struct p_req_state_reply req_state_reply
;
599 struct p_block_req block_req
;
602 /**********************************************************************/
603 enum drbd_thread_state
{
612 struct task_struct
*task
;
613 struct completion stop
;
614 enum drbd_thread_state t_state
;
615 int (*function
) (struct drbd_thread
*);
616 struct drbd_conf
*mdev
;
620 static inline enum drbd_thread_state
get_t_state(struct drbd_thread
*thi
)
622 /* THINK testing the t_state seems to be uncritical in all cases
623 * (but thread_{start,stop}), so we can read it *without* the lock.
632 * Having this as the first member of a struct provides sort of "inheritance".
633 * "derived" structs can be "drbd_queue_work()"ed.
634 * The callback should know and cast back to the descendant struct.
635 * drbd_request and drbd_epoch_entry are descendants of drbd_work.
638 typedef int (*drbd_work_cb
)(struct drbd_conf
*, struct drbd_work
*, int cancel
);
640 struct list_head list
;
644 struct drbd_tl_epoch
;
645 struct drbd_request
{
647 struct drbd_conf
*mdev
;
649 /* if local IO is not allowed, will be NULL.
650 * if local IO _is_ allowed, holds the locally submitted bio clone,
651 * or, after local IO completion, the ERR_PTR(error).
652 * see drbd_endio_pri(). */
653 struct bio
*private_bio
;
655 struct hlist_node colision
;
658 unsigned int epoch
; /* barrier_nr */
660 /* barrier_nr: used to check on "completion" whether this req was in
661 * the current epoch, and we therefore have to close it,
662 * starting a new epoch...
665 /* up to here, the struct layout is identical to drbd_epoch_entry;
666 * we might be able to use that to our advantage... */
668 struct list_head tl_requests
; /* ring list in the transfer log */
669 struct bio
*master_bio
; /* master bio pointer */
670 unsigned long rq_state
; /* see comments above _req_mod() */
672 unsigned long start_time
;
675 struct drbd_tl_epoch
{
677 struct list_head requests
; /* requests before */
678 struct drbd_tl_epoch
*next
; /* pointer to the next barrier */
679 unsigned int br_number
; /* the barriers identifier. */
680 int n_req
; /* number of requests attached before this barrier */
685 /* These Tl_epoch_entries may be in one of 6 lists:
686 active_ee .. data packet being written
687 sync_ee .. syncer block being written
688 done_ee .. block written, need to send P_WRITE_ACK
689 read_ee .. [RS]P_DATA_REQUEST being read
693 struct list_head list
;
694 unsigned int barrier_nr
;
695 atomic_t epoch_size
; /* increased on every request added. */
696 atomic_t active
; /* increased on every req. added, and dec on every finished. */
700 /* drbd_epoch flag bits */
702 DE_BARRIER_IN_NEXT_EPOCH_ISSUED
,
703 DE_BARRIER_IN_NEXT_EPOCH_DONE
,
704 DE_CONTAINS_A_BARRIER
,
705 DE_HAVE_BARRIER_NUMBER
,
714 EV_CLEANUP
= 32, /* used as flag */
717 struct drbd_epoch_entry
{
719 struct drbd_conf
*mdev
;
720 struct bio
*private_bio
;
721 struct hlist_node colision
;
724 struct drbd_epoch
*epoch
;
726 /* up to here, the struct layout is identical to drbd_request;
727 * we might be able to use that to our advantage... */
733 struct drbd_wq_barrier
{
735 struct completion done
;
745 __EE_CALL_AL_COMPLETE_IO
,
746 __EE_CONFLICT_PENDING
,
747 __EE_MAY_SET_IN_SYNC
,
750 #define EE_CALL_AL_COMPLETE_IO (1<<__EE_CALL_AL_COMPLETE_IO)
751 #define EE_CONFLICT_PENDING (1<<__EE_CONFLICT_PENDING)
752 #define EE_MAY_SET_IN_SYNC (1<<__EE_MAY_SET_IN_SYNC)
753 #define EE_IS_BARRIER (1<<__EE_IS_BARRIER)
755 /* global flag bits */
757 CREATE_BARRIER
, /* next P_DATA is preceeded by a P_BARRIER */
758 SIGNAL_ASENDER
, /* whether asender wants to be interrupted */
759 SEND_PING
, /* whether asender should send a ping asap */
761 STOP_SYNC_TIMER
, /* tell timer to cancel itself */
762 UNPLUG_QUEUED
, /* only relevant with kernel 2.4 */
763 UNPLUG_REMOTE
, /* sending a "UnplugRemote" could help */
764 MD_DIRTY
, /* current uuids and flags not yet on disk */
765 DISCARD_CONCURRENT
, /* Set on one node, cleared on the peer! */
766 USE_DEGR_WFC_T
, /* degr-wfc-timeout instead of wfc-timeout. */
767 CLUSTER_ST_CHANGE
, /* Cluster wide state change going on... */
770 CRASHED_PRIMARY
, /* This node was a crashed primary.
771 * Gets cleared when the state.conn
772 * goes into C_CONNECTED state. */
773 WRITE_BM_AFTER_RESYNC
, /* A kmalloc() during resync failed */
774 NO_BARRIER_SUPP
, /* underlying block device doesn't implement barriers */
777 MD_NO_BARRIER
, /* meta data device does not support barriers,
779 SUSPEND_IO
, /* suspend application io */
780 BITMAP_IO
, /* suspend application io;
781 once no more io in flight, start bitmap io */
782 BITMAP_IO_QUEUED
, /* Started bitmap IO */
783 RESYNC_AFTER_NEG
, /* Resync after online grow after the attach&negotiate finished. */
784 NET_CONGESTED
, /* The data socket is congested */
786 CONFIG_PENDING
, /* serialization of (re)configuration requests.
787 * if set, also prevents the device from dying */
788 DEVICE_DYING
, /* device became unconfigured,
789 * but worker thread is still handling the cleanup.
790 * reconfiguring (nl_disk_conf, nl_net_conf) is dissalowed,
791 * while this is set. */
792 RESIZE_PENDING
, /* Size change detected locally, waiting for the response from
793 * the peer, if it changed there as well. */
796 struct drbd_bitmap
; /* opaque for drbd_conf */
798 /* TODO sort members for performance
799 * MAYBE group them further */
801 /* THINK maybe we actually want to use the default "event/%s" worker threads
802 * or similar in linux 2.6, which uses per cpu data and threads.
804 * To be general, this might need a spin_lock member.
805 * For now, please use the mdev->req_lock to protect list_head,
806 * see drbd_queue_work below.
808 struct drbd_work_queue
{
810 struct semaphore s
; /* producers up it, worker down()s it */
811 spinlock_t q_lock
; /* to protect the list. */
815 struct drbd_work_queue work
;
817 struct socket
*socket
;
818 /* this way we get our
819 * send/receive buffers off the stack */
820 union p_polymorph sbuf
;
821 union p_polymorph rbuf
;
825 u64 md_offset
; /* sector offset to 'super' block */
827 u64 la_size_sect
; /* last agreed size, unit sectors */
833 s32 al_offset
; /* signed relative sector offset to al area */
834 s32 bm_offset
; /* signed relative sector offset to bitmap */
836 /* u32 al_nr_extents; important for restoring the AL
837 * is stored into sync_conf.al_extents, which in turn
838 * gets applied to act_log->nr_elements
842 /* for sync_conf and other types... */
843 #define NL_PACKET(name, number, fields) struct name { fields };
844 #define NL_INTEGER(pn,pr,member) int member;
845 #define NL_INT64(pn,pr,member) __u64 member;
846 #define NL_BIT(pn,pr,member) unsigned member:1;
847 #define NL_STRING(pn,pr,member,len) unsigned char member[len]; int member ## _len;
848 #include "linux/drbd_nl.h"
850 struct drbd_backing_dev
{
851 struct block_device
*backing_bdev
;
852 struct block_device
*md_bdev
;
853 struct file
*lo_file
;
854 struct file
*md_file
;
856 struct disk_conf dc
; /* The user provided config... */
857 sector_t known_size
; /* last known size of that backing device */
861 struct drbd_conf
*mdev
;
862 struct completion event
;
869 int (*io_fn
)(struct drbd_conf
*mdev
);
870 void (*done
)(struct drbd_conf
*mdev
, int rv
);
873 enum write_ordering_e
{
881 /* things that are stored as / read from meta data on disk */
884 /* configured by drbdsetup */
885 struct net_conf
*net_conf
; /* protected by get_net_conf() and put_net_conf() */
886 struct syncer_conf sync_conf
;
887 struct drbd_backing_dev
*ldev
__protected_by(local
);
889 sector_t p_size
; /* partner's disk size */
890 struct request_queue
*rq_queue
;
891 struct block_device
*this_bdev
;
892 struct gendisk
*vdisk
;
894 struct drbd_socket data
; /* data/barrier/cstate/parameter packets */
895 struct drbd_socket meta
; /* ping/ack (metadata) packets */
896 int agreed_pro_version
; /* actually used protocol version */
897 unsigned long last_received
; /* in jiffies, either socket */
898 unsigned int ko_count
;
899 struct drbd_work resync_work
,
902 struct timer_list resync_timer
;
903 struct timer_list md_sync_timer
;
905 /* Used after attach while negotiating new disk state. */
906 union drbd_state new_state_tmp
;
908 union drbd_state state
;
909 wait_queue_head_t misc_wait
;
910 wait_queue_head_t state_wait
; /* upon each state change. */
911 unsigned int send_cnt
;
912 unsigned int recv_cnt
;
913 unsigned int read_cnt
;
914 unsigned int writ_cnt
;
915 unsigned int al_writ_cnt
;
916 unsigned int bm_writ_cnt
;
917 atomic_t ap_bio_cnt
; /* Requests we need to complete */
918 atomic_t ap_pending_cnt
; /* AP data packets on the wire, ack expected */
919 atomic_t rs_pending_cnt
; /* RS request/data packets on the wire */
920 atomic_t unacked_cnt
; /* Need to send replys for */
921 atomic_t local_cnt
; /* Waiting for local completion */
922 atomic_t net_cnt
; /* Users of net_conf */
924 struct drbd_tl_epoch
*unused_spare_tle
; /* for pre-allocation */
925 struct drbd_tl_epoch
*newest_tle
;
926 struct drbd_tl_epoch
*oldest_tle
;
927 struct list_head out_of_sequence_requests
;
928 struct hlist_head
*tl_hash
;
929 unsigned int tl_hash_s
;
931 /* blocks to sync in this run [unit BM_BLOCK_SIZE] */
932 unsigned long rs_total
;
933 /* number of sync IOs that failed in this run */
934 unsigned long rs_failed
;
935 /* Syncer's start time [unit jiffies] */
936 unsigned long rs_start
;
937 /* cumulated time in PausedSyncX state [unit jiffies] */
938 unsigned long rs_paused
;
939 /* block not up-to-date at mark [unit BM_BLOCK_SIZE] */
940 unsigned long rs_mark_left
;
941 /* marks's time [unit jiffies] */
942 unsigned long rs_mark_time
;
943 /* skipped because csum was equeal [unit BM_BLOCK_SIZE] */
944 unsigned long rs_same_csum
;
946 /* where does the admin want us to start? (sector) */
947 sector_t ov_start_sector
;
948 /* where are we now? (sector) */
949 sector_t ov_position
;
950 /* Start sector of out of sync range (to merge printk reporting). */
951 sector_t ov_last_oos_start
;
952 /* size of out-of-sync range in sectors. */
953 sector_t ov_last_oos_size
;
954 unsigned long ov_left
; /* in bits */
955 struct crypto_hash
*csums_tfm
;
956 struct crypto_hash
*verify_tfm
;
958 struct drbd_thread receiver
;
959 struct drbd_thread worker
;
960 struct drbd_thread asender
;
961 struct drbd_bitmap
*bitmap
;
962 unsigned long bm_resync_fo
; /* bit offset for drbd_bm_find_next */
964 /* Used to track operations of resync... */
965 struct lru_cache
*resync
;
966 /* Number of locked elements in resync LRU */
967 unsigned int resync_locked
;
968 /* resync extent number waiting for application requests */
969 unsigned int resync_wenr
;
973 struct drbd_epoch
*current_epoch
;
974 spinlock_t epoch_lock
;
976 enum write_ordering_e write_ordering
;
977 struct list_head active_ee
; /* IO in progress */
978 struct list_head sync_ee
; /* IO in progress */
979 struct list_head done_ee
; /* send ack */
980 struct list_head read_ee
; /* IO in progress */
981 struct list_head net_ee
; /* zero-copy network send in progress */
982 struct hlist_head
*ee_hash
; /* is proteced by req_lock! */
983 unsigned int ee_hash_s
;
985 /* this one is protected by ee_lock, single thread */
986 struct drbd_epoch_entry
*last_write_w_barrier
;
989 struct hlist_head
*app_reads_hash
; /* is proteced by req_lock */
990 struct list_head resync_reads
;
992 wait_queue_head_t ee_wait
;
993 struct page
*md_io_page
; /* one page buffer for md_io */
994 struct page
*md_io_tmpp
; /* for logical_block_size != 512 */
995 struct mutex md_io_mutex
; /* protects the md_io_buffer */
997 wait_queue_head_t al_wait
;
998 struct lru_cache
*act_log
; /* activity log */
999 unsigned int al_tr_number
;
1001 int al_tr_pos
; /* position of the next transaction in the journal */
1002 struct crypto_hash
*cram_hmac_tfm
;
1003 struct crypto_hash
*integrity_w_tfm
; /* to be used by the worker thread */
1004 struct crypto_hash
*integrity_r_tfm
; /* to be used by the receiver thread */
1008 wait_queue_head_t seq_wait
;
1009 atomic_t packet_seq
;
1010 unsigned int peer_seq
;
1011 spinlock_t peer_seq_lock
;
1013 unsigned long comm_bm_set
; /* communicated number of set bits. */
1014 cpumask_var_t cpu_mask
;
1015 struct bm_io_work bm_io_work
;
1016 u64 ed_uuid
; /* UUID of the exposed data */
1017 struct mutex state_mutex
;
1018 char congestion_reason
; /* Why we where congested... */
1021 static inline struct drbd_conf
*minor_to_mdev(unsigned int minor
)
1023 struct drbd_conf
*mdev
;
1025 mdev
= minor
< minor_count
? minor_table
[minor
] : NULL
;
1030 static inline unsigned int mdev_to_minor(struct drbd_conf
*mdev
)
1035 /* returns 1 if it was successfull,
1036 * returns 0 if there was no data socket.
1037 * so wherever you are going to use the data.socket, e.g. do
1038 * if (!drbd_get_data_sock(mdev))
1041 * drbd_put_data_sock(mdev);
1043 static inline int drbd_get_data_sock(struct drbd_conf
*mdev
)
1045 mutex_lock(&mdev
->data
.mutex
);
1046 /* drbd_disconnect() could have called drbd_free_sock()
1047 * while we were waiting in down()... */
1048 if (unlikely(mdev
->data
.socket
== NULL
)) {
1049 mutex_unlock(&mdev
->data
.mutex
);
1055 static inline void drbd_put_data_sock(struct drbd_conf
*mdev
)
1057 mutex_unlock(&mdev
->data
.mutex
);
1061 * function declarations
1062 *************************/
1066 enum chg_state_flags
{
1069 CS_WAIT_COMPLETE
= 4,
1071 CS_ORDERED
= CS_WAIT_COMPLETE
+ CS_SERIALIZE
,
1074 extern void drbd_init_set_defaults(struct drbd_conf
*mdev
);
1075 extern int drbd_change_state(struct drbd_conf
*mdev
, enum chg_state_flags f
,
1076 union drbd_state mask
, union drbd_state val
);
1077 extern void drbd_force_state(struct drbd_conf
*, union drbd_state
,
1079 extern int _drbd_request_state(struct drbd_conf
*, union drbd_state
,
1080 union drbd_state
, enum chg_state_flags
);
1081 extern int __drbd_set_state(struct drbd_conf
*, union drbd_state
,
1082 enum chg_state_flags
, struct completion
*done
);
1083 extern void print_st_err(struct drbd_conf
*, union drbd_state
,
1084 union drbd_state
, int);
1085 extern int drbd_thread_start(struct drbd_thread
*thi
);
1086 extern void _drbd_thread_stop(struct drbd_thread
*thi
, int restart
, int wait
);
1088 extern void drbd_thread_current_set_cpu(struct drbd_conf
*mdev
);
1089 extern void drbd_calc_cpu_mask(struct drbd_conf
*mdev
);
1091 #define drbd_thread_current_set_cpu(A) ({})
1092 #define drbd_calc_cpu_mask(A) ({})
1094 extern void drbd_free_resources(struct drbd_conf
*mdev
);
1095 extern void tl_release(struct drbd_conf
*mdev
, unsigned int barrier_nr
,
1096 unsigned int set_size
);
1097 extern void tl_clear(struct drbd_conf
*mdev
);
1098 extern void _tl_add_barrier(struct drbd_conf
*, struct drbd_tl_epoch
*);
1099 extern void drbd_free_sock(struct drbd_conf
*mdev
);
1100 extern int drbd_send(struct drbd_conf
*mdev
, struct socket
*sock
,
1101 void *buf
, size_t size
, unsigned msg_flags
);
1102 extern int drbd_send_protocol(struct drbd_conf
*mdev
);
1103 extern int drbd_send_uuids(struct drbd_conf
*mdev
);
1104 extern int drbd_send_uuids_skip_initial_sync(struct drbd_conf
*mdev
);
1105 extern int drbd_send_sync_uuid(struct drbd_conf
*mdev
, u64 val
);
1106 extern int drbd_send_sizes(struct drbd_conf
*mdev
, int trigger_reply
);
1107 extern int _drbd_send_state(struct drbd_conf
*mdev
);
1108 extern int drbd_send_state(struct drbd_conf
*mdev
);
1109 extern int _drbd_send_cmd(struct drbd_conf
*mdev
, struct socket
*sock
,
1110 enum drbd_packets cmd
, struct p_header
*h
,
1111 size_t size
, unsigned msg_flags
);
1112 #define USE_DATA_SOCKET 1
1113 #define USE_META_SOCKET 0
1114 extern int drbd_send_cmd(struct drbd_conf
*mdev
, int use_data_socket
,
1115 enum drbd_packets cmd
, struct p_header
*h
,
1117 extern int drbd_send_cmd2(struct drbd_conf
*mdev
, enum drbd_packets cmd
,
1118 char *data
, size_t size
);
1119 extern int drbd_send_sync_param(struct drbd_conf
*mdev
, struct syncer_conf
*sc
);
1120 extern int drbd_send_b_ack(struct drbd_conf
*mdev
, u32 barrier_nr
,
1122 extern int drbd_send_ack(struct drbd_conf
*mdev
, enum drbd_packets cmd
,
1123 struct drbd_epoch_entry
*e
);
1124 extern int drbd_send_ack_rp(struct drbd_conf
*mdev
, enum drbd_packets cmd
,
1125 struct p_block_req
*rp
);
1126 extern int drbd_send_ack_dp(struct drbd_conf
*mdev
, enum drbd_packets cmd
,
1128 extern int drbd_send_ack_ex(struct drbd_conf
*mdev
, enum drbd_packets cmd
,
1129 sector_t sector
, int blksize
, u64 block_id
);
1130 extern int drbd_send_block(struct drbd_conf
*mdev
, enum drbd_packets cmd
,
1131 struct drbd_epoch_entry
*e
);
1132 extern int drbd_send_dblock(struct drbd_conf
*mdev
, struct drbd_request
*req
);
1133 extern int _drbd_send_barrier(struct drbd_conf
*mdev
,
1134 struct drbd_tl_epoch
*barrier
);
1135 extern int drbd_send_drequest(struct drbd_conf
*mdev
, int cmd
,
1136 sector_t sector
, int size
, u64 block_id
);
1137 extern int drbd_send_drequest_csum(struct drbd_conf
*mdev
,
1138 sector_t sector
,int size
,
1139 void *digest
, int digest_size
,
1140 enum drbd_packets cmd
);
1141 extern int drbd_send_ov_request(struct drbd_conf
*mdev
,sector_t sector
,int size
);
1143 extern int drbd_send_bitmap(struct drbd_conf
*mdev
);
1144 extern int _drbd_send_bitmap(struct drbd_conf
*mdev
);
1145 extern int drbd_send_sr_reply(struct drbd_conf
*mdev
, int retcode
);
1146 extern void drbd_free_bc(struct drbd_backing_dev
*ldev
);
1147 extern void drbd_mdev_cleanup(struct drbd_conf
*mdev
);
1149 /* drbd_meta-data.c (still in drbd_main.c) */
1150 extern void drbd_md_sync(struct drbd_conf
*mdev
);
1151 extern int drbd_md_read(struct drbd_conf
*mdev
, struct drbd_backing_dev
*bdev
);
1152 /* maybe define them below as inline? */
1153 extern void drbd_uuid_set(struct drbd_conf
*mdev
, int idx
, u64 val
) __must_hold(local
);
1154 extern void _drbd_uuid_set(struct drbd_conf
*mdev
, int idx
, u64 val
) __must_hold(local
);
1155 extern void drbd_uuid_new_current(struct drbd_conf
*mdev
) __must_hold(local
);
1156 extern void _drbd_uuid_new_current(struct drbd_conf
*mdev
) __must_hold(local
);
1157 extern void drbd_uuid_set_bm(struct drbd_conf
*mdev
, u64 val
) __must_hold(local
);
1158 extern void drbd_md_set_flag(struct drbd_conf
*mdev
, int flags
) __must_hold(local
);
1159 extern void drbd_md_clear_flag(struct drbd_conf
*mdev
, int flags
)__must_hold(local
);
1160 extern int drbd_md_test_flag(struct drbd_backing_dev
*, int);
1161 extern void drbd_md_mark_dirty(struct drbd_conf
*mdev
);
1162 extern void drbd_queue_bitmap_io(struct drbd_conf
*mdev
,
1163 int (*io_fn
)(struct drbd_conf
*),
1164 void (*done
)(struct drbd_conf
*, int),
1166 extern int drbd_bmio_set_n_write(struct drbd_conf
*mdev
);
1167 extern int drbd_bmio_clear_n_write(struct drbd_conf
*mdev
);
1168 extern int drbd_bitmap_io(struct drbd_conf
*mdev
, int (*io_fn
)(struct drbd_conf
*), char *why
);
1172 We reserve a 128MB Block (4k aligned)
1173 * either at the end of the backing device
1174 * or on a seperate meta data device. */
1176 #define MD_RESERVED_SECT (128LU << 11) /* 128 MB, unit sectors */
1177 /* The following numbers are sectors */
1178 #define MD_AL_OFFSET 8 /* 8 Sectors after start of meta area */
1179 #define MD_AL_MAX_SIZE 64 /* = 32 kb LOG ~ 3776 extents ~ 14 GB Storage */
1180 /* Allows up to about 3.8TB */
1181 #define MD_BM_OFFSET (MD_AL_OFFSET + MD_AL_MAX_SIZE)
1183 /* Since the smalles IO unit is usually 512 byte */
1184 #define MD_SECTOR_SHIFT 9
1185 #define MD_SECTOR_SIZE (1<<MD_SECTOR_SHIFT)
1188 #define AL_EXTENTS_PT ((MD_SECTOR_SIZE-12)/8-1) /* 61 ; Extents per 512B sector */
1189 #define AL_EXTENT_SHIFT 22 /* One extent represents 4M Storage */
1190 #define AL_EXTENT_SIZE (1<<AL_EXTENT_SHIFT)
1192 #if BITS_PER_LONG == 32
1194 #define cpu_to_lel(A) cpu_to_le32(A)
1195 #define lel_to_cpu(A) le32_to_cpu(A)
1196 #elif BITS_PER_LONG == 64
1198 #define cpu_to_lel(A) cpu_to_le64(A)
1199 #define lel_to_cpu(A) le64_to_cpu(A)
1201 #error "LN2 of BITS_PER_LONG unknown!"
1205 /* 16MB sized 'bitmap extent' to track syncer usage */
1207 int rs_left
; /* number of bits set (out of sync) in this extent. */
1208 int rs_failed
; /* number of failed resync requests in this extent. */
1209 unsigned long flags
;
1210 struct lc_element lce
;
1213 #define BME_NO_WRITES 0 /* bm_extent.flags: no more requests on this one! */
1214 #define BME_LOCKED 1 /* bm_extent.flags: syncer active on this one. */
1218 * We need to store one bit for a block.
1219 * Example: 1GB disk @ 4096 byte blocks ==> we need 32 KB bitmap.
1220 * Bit 0 ==> local node thinks this block is binary identical on both nodes
1221 * Bit 1 ==> local node thinks this block needs to be synced.
1224 #define BM_BLOCK_SHIFT 12 /* 4k per bit */
1225 #define BM_BLOCK_SIZE (1<<BM_BLOCK_SHIFT)
1226 /* (9+3) : 512 bytes @ 8 bits; representing 16M storage
1227 * per sector of on disk bitmap */
1228 #define BM_EXT_SHIFT (BM_BLOCK_SHIFT + MD_SECTOR_SHIFT + 3) /* = 24 */
1229 #define BM_EXT_SIZE (1<<BM_EXT_SHIFT)
1231 #if (BM_EXT_SHIFT != 24) || (BM_BLOCK_SHIFT != 12)
1232 #error "HAVE YOU FIXED drbdmeta AS WELL??"
1235 /* thus many _storage_ sectors are described by one bit */
1236 #define BM_SECT_TO_BIT(x) ((x)>>(BM_BLOCK_SHIFT-9))
1237 #define BM_BIT_TO_SECT(x) ((sector_t)(x)<<(BM_BLOCK_SHIFT-9))
1238 #define BM_SECT_PER_BIT BM_BIT_TO_SECT(1)
1240 /* bit to represented kilo byte conversion */
1241 #define Bit2KB(bits) ((bits)<<(BM_BLOCK_SHIFT-10))
1243 /* in which _bitmap_ extent (resp. sector) the bit for a certain
1244 * _storage_ sector is located in */
1245 #define BM_SECT_TO_EXT(x) ((x)>>(BM_EXT_SHIFT-9))
1247 /* how much _storage_ sectors we have per bitmap sector */
1248 #define BM_EXT_TO_SECT(x) ((sector_t)(x) << (BM_EXT_SHIFT-9))
1249 #define BM_SECT_PER_EXT BM_EXT_TO_SECT(1)
1251 /* in one sector of the bitmap, we have this many activity_log extents. */
1252 #define AL_EXT_PER_BM_SECT (1 << (BM_EXT_SHIFT - AL_EXTENT_SHIFT))
1253 #define BM_WORDS_PER_AL_EXT (1 << (AL_EXTENT_SHIFT-BM_BLOCK_SHIFT-LN2_BPL))
1255 #define BM_BLOCKS_PER_BM_EXT_B (BM_EXT_SHIFT - BM_BLOCK_SHIFT)
1256 #define BM_BLOCKS_PER_BM_EXT_MASK ((1<<BM_BLOCKS_PER_BM_EXT_B) - 1)
1258 /* the extent in "PER_EXTENT" below is an activity log extent
1259 * we need that many (long words/bytes) to store the bitmap
1260 * of one AL_EXTENT_SIZE chunk of storage.
1261 * we can store the bitmap for that many AL_EXTENTS within
1262 * one sector of the _on_disk_ bitmap:
1263 * bit 0 bit 37 bit 38 bit (512*8)-1
1264 * ...|........|........|.. // ..|........|
1265 * sect. 0 `296 `304 ^(512*8*8)-1
1267 #define BM_WORDS_PER_EXT ( (AL_EXT_SIZE/BM_BLOCK_SIZE) / BITS_PER_LONG )
1268 #define BM_BYTES_PER_EXT ( (AL_EXT_SIZE/BM_BLOCK_SIZE) / 8 ) // 128
1269 #define BM_EXT_PER_SECT ( 512 / BM_BYTES_PER_EXTENT ) // 4
1272 #define DRBD_MAX_SECTORS_32 (0xffffffffLU)
1273 #define DRBD_MAX_SECTORS_BM \
1274 ((MD_RESERVED_SECT - MD_BM_OFFSET) * (1LL<<(BM_EXT_SHIFT-9)))
1275 #if DRBD_MAX_SECTORS_BM < DRBD_MAX_SECTORS_32
1276 #define DRBD_MAX_SECTORS DRBD_MAX_SECTORS_BM
1277 #define DRBD_MAX_SECTORS_FLEX DRBD_MAX_SECTORS_BM
1278 #elif !defined(CONFIG_LBDAF) && BITS_PER_LONG == 32
1279 #define DRBD_MAX_SECTORS DRBD_MAX_SECTORS_32
1280 #define DRBD_MAX_SECTORS_FLEX DRBD_MAX_SECTORS_32
1282 #define DRBD_MAX_SECTORS DRBD_MAX_SECTORS_BM
1283 /* 16 TB in units of sectors */
1284 #if BITS_PER_LONG == 32
1285 /* adjust by one page worth of bitmap,
1286 * so we won't wrap around in drbd_bm_find_next_bit.
1287 * you should use 64bit OS for that much storage, anyways. */
1288 #define DRBD_MAX_SECTORS_FLEX BM_BIT_TO_SECT(0xffff7fff)
1290 #define DRBD_MAX_SECTORS_FLEX BM_BIT_TO_SECT(0x1LU << 32)
1294 /* Sector shift value for the "hash" functions of tl_hash and ee_hash tables.
1295 * With a value of 6 all IO in one 32K block make it to the same slot of the
1298 #define DRBD_MAX_SEGMENT_SIZE (1U<<(9+HT_SHIFT))
1300 /* Number of elements in the app_reads_hash */
1301 #define APP_R_HSIZE 15
1303 extern int drbd_bm_init(struct drbd_conf
*mdev
);
1304 extern int drbd_bm_resize(struct drbd_conf
*mdev
, sector_t sectors
);
1305 extern void drbd_bm_cleanup(struct drbd_conf
*mdev
);
1306 extern void drbd_bm_set_all(struct drbd_conf
*mdev
);
1307 extern void drbd_bm_clear_all(struct drbd_conf
*mdev
);
1308 extern int drbd_bm_set_bits(
1309 struct drbd_conf
*mdev
, unsigned long s
, unsigned long e
);
1310 extern int drbd_bm_clear_bits(
1311 struct drbd_conf
*mdev
, unsigned long s
, unsigned long e
);
1312 /* bm_set_bits variant for use while holding drbd_bm_lock */
1313 extern void _drbd_bm_set_bits(struct drbd_conf
*mdev
,
1314 const unsigned long s
, const unsigned long e
);
1315 extern int drbd_bm_test_bit(struct drbd_conf
*mdev
, unsigned long bitnr
);
1316 extern int drbd_bm_e_weight(struct drbd_conf
*mdev
, unsigned long enr
);
1317 extern int drbd_bm_write_sect(struct drbd_conf
*mdev
, unsigned long enr
) __must_hold(local
);
1318 extern int drbd_bm_read(struct drbd_conf
*mdev
) __must_hold(local
);
1319 extern int drbd_bm_write(struct drbd_conf
*mdev
) __must_hold(local
);
1320 extern unsigned long drbd_bm_ALe_set_all(struct drbd_conf
*mdev
,
1321 unsigned long al_enr
);
1322 extern size_t drbd_bm_words(struct drbd_conf
*mdev
);
1323 extern unsigned long drbd_bm_bits(struct drbd_conf
*mdev
);
1324 extern sector_t
drbd_bm_capacity(struct drbd_conf
*mdev
);
1325 extern unsigned long drbd_bm_find_next(struct drbd_conf
*mdev
, unsigned long bm_fo
);
1326 /* bm_find_next variants for use while you hold drbd_bm_lock() */
1327 extern unsigned long _drbd_bm_find_next(struct drbd_conf
*mdev
, unsigned long bm_fo
);
1328 extern unsigned long _drbd_bm_find_next_zero(struct drbd_conf
*mdev
, unsigned long bm_fo
);
1329 extern unsigned long drbd_bm_total_weight(struct drbd_conf
*mdev
);
1330 extern int drbd_bm_rs_done(struct drbd_conf
*mdev
);
1331 /* for receive_bitmap */
1332 extern void drbd_bm_merge_lel(struct drbd_conf
*mdev
, size_t offset
,
1333 size_t number
, unsigned long *buffer
);
1334 /* for _drbd_send_bitmap and drbd_bm_write_sect */
1335 extern void drbd_bm_get_lel(struct drbd_conf
*mdev
, size_t offset
,
1336 size_t number
, unsigned long *buffer
);
1338 extern void drbd_bm_lock(struct drbd_conf
*mdev
, char *why
);
1339 extern void drbd_bm_unlock(struct drbd_conf
*mdev
);
1341 extern int drbd_bm_count_bits(struct drbd_conf
*mdev
, const unsigned long s
, const unsigned long e
);
1344 extern struct kmem_cache
*drbd_request_cache
;
1345 extern struct kmem_cache
*drbd_ee_cache
; /* epoch entries */
1346 extern struct kmem_cache
*drbd_bm_ext_cache
; /* bitmap extents */
1347 extern struct kmem_cache
*drbd_al_ext_cache
; /* activity log extents */
1348 extern mempool_t
*drbd_request_mempool
;
1349 extern mempool_t
*drbd_ee_mempool
;
1351 extern struct page
*drbd_pp_pool
; /* drbd's page pool */
1352 extern spinlock_t drbd_pp_lock
;
1353 extern int drbd_pp_vacant
;
1354 extern wait_queue_head_t drbd_pp_wait
;
1356 extern rwlock_t global_state_lock
;
1358 extern struct drbd_conf
*drbd_new_device(unsigned int minor
);
1359 extern void drbd_free_mdev(struct drbd_conf
*mdev
);
1361 extern int proc_details
;
1364 extern int drbd_make_request_26(struct request_queue
*q
, struct bio
*bio
);
1365 extern int drbd_read_remote(struct drbd_conf
*mdev
, struct drbd_request
*req
);
1366 extern int drbd_merge_bvec(struct request_queue
*q
, struct bvec_merge_data
*bvm
, struct bio_vec
*bvec
);
1367 extern int is_valid_ar_handle(struct drbd_request
*, sector_t
);
1371 extern void drbd_suspend_io(struct drbd_conf
*mdev
);
1372 extern void drbd_resume_io(struct drbd_conf
*mdev
);
1373 extern char *ppsize(char *buf
, unsigned long long size
);
1374 extern sector_t
drbd_new_dev_size(struct drbd_conf
*, struct drbd_backing_dev
*, int);
1375 enum determine_dev_size
{ dev_size_error
= -1, unchanged
= 0, shrunk
= 1, grew
= 2 };
1376 extern enum determine_dev_size
drbd_determin_dev_size(struct drbd_conf
*, int force
) __must_hold(local
);
1377 extern void resync_after_online_grow(struct drbd_conf
*);
1378 extern void drbd_setup_queue_param(struct drbd_conf
*mdev
, unsigned int) __must_hold(local
);
1379 extern int drbd_set_role(struct drbd_conf
*mdev
, enum drbd_role new_role
,
1381 enum drbd_disk_state
drbd_try_outdate_peer(struct drbd_conf
*mdev
);
1382 extern int drbd_khelper(struct drbd_conf
*mdev
, char *cmd
);
1385 extern int drbd_worker(struct drbd_thread
*thi
);
1386 extern int drbd_alter_sa(struct drbd_conf
*mdev
, int na
);
1387 extern void drbd_start_resync(struct drbd_conf
*mdev
, enum drbd_conns side
);
1388 extern void resume_next_sg(struct drbd_conf
*mdev
);
1389 extern void suspend_other_sg(struct drbd_conf
*mdev
);
1390 extern int drbd_resync_finished(struct drbd_conf
*mdev
);
1391 /* maybe rather drbd_main.c ? */
1392 extern int drbd_md_sync_page_io(struct drbd_conf
*mdev
,
1393 struct drbd_backing_dev
*bdev
, sector_t sector
, int rw
);
1394 extern void drbd_ov_oos_found(struct drbd_conf
*, sector_t
, int);
1396 static inline void ov_oos_print(struct drbd_conf
*mdev
)
1398 if (mdev
->ov_last_oos_size
) {
1399 dev_err(DEV
, "Out of sync: start=%llu, size=%lu (sectors)\n",
1400 (unsigned long long)mdev
->ov_last_oos_start
,
1401 (unsigned long)mdev
->ov_last_oos_size
);
1403 mdev
->ov_last_oos_size
=0;
1407 extern void drbd_csum(struct drbd_conf
*, struct crypto_hash
*, struct bio
*, void *);
1408 /* worker callbacks */
1409 extern int w_req_cancel_conflict(struct drbd_conf
*, struct drbd_work
*, int);
1410 extern int w_read_retry_remote(struct drbd_conf
*, struct drbd_work
*, int);
1411 extern int w_e_end_data_req(struct drbd_conf
*, struct drbd_work
*, int);
1412 extern int w_e_end_rsdata_req(struct drbd_conf
*, struct drbd_work
*, int);
1413 extern int w_e_end_csum_rs_req(struct drbd_conf
*, struct drbd_work
*, int);
1414 extern int w_e_end_ov_reply(struct drbd_conf
*, struct drbd_work
*, int);
1415 extern int w_e_end_ov_req(struct drbd_conf
*, struct drbd_work
*, int);
1416 extern int w_ov_finished(struct drbd_conf
*, struct drbd_work
*, int);
1417 extern int w_resync_inactive(struct drbd_conf
*, struct drbd_work
*, int);
1418 extern int w_resume_next_sg(struct drbd_conf
*, struct drbd_work
*, int);
1419 extern int w_io_error(struct drbd_conf
*, struct drbd_work
*, int);
1420 extern int w_send_write_hint(struct drbd_conf
*, struct drbd_work
*, int);
1421 extern int w_make_resync_request(struct drbd_conf
*, struct drbd_work
*, int);
1422 extern int w_send_dblock(struct drbd_conf
*, struct drbd_work
*, int);
1423 extern int w_send_barrier(struct drbd_conf
*, struct drbd_work
*, int);
1424 extern int w_send_read_req(struct drbd_conf
*, struct drbd_work
*, int);
1425 extern int w_prev_work_done(struct drbd_conf
*, struct drbd_work
*, int);
1426 extern int w_e_reissue(struct drbd_conf
*, struct drbd_work
*, int);
1428 extern void resync_timer_fn(unsigned long data
);
1430 /* drbd_receiver.c */
1431 extern int drbd_release_ee(struct drbd_conf
*mdev
, struct list_head
*list
);
1432 extern struct drbd_epoch_entry
*drbd_alloc_ee(struct drbd_conf
*mdev
,
1435 unsigned int data_size
,
1436 gfp_t gfp_mask
) __must_hold(local
);
1437 extern void drbd_free_ee(struct drbd_conf
*mdev
, struct drbd_epoch_entry
*e
);
1438 extern void drbd_wait_ee_list_empty(struct drbd_conf
*mdev
,
1439 struct list_head
*head
);
1440 extern void _drbd_wait_ee_list_empty(struct drbd_conf
*mdev
,
1441 struct list_head
*head
);
1442 extern void drbd_set_recv_tcq(struct drbd_conf
*mdev
, int tcq_enabled
);
1443 extern void _drbd_clear_done_ee(struct drbd_conf
*mdev
, struct list_head
*to_be_freed
);
1444 extern void drbd_flush_workqueue(struct drbd_conf
*mdev
);
1446 /* yes, there is kernel_setsockopt, but only since 2.6.18. we don't need to
1447 * mess with get_fs/set_fs, we know we are KERNEL_DS always. */
1448 static inline int drbd_setsockopt(struct socket
*sock
, int level
, int optname
,
1449 char __user
*optval
, int optlen
)
1452 if (level
== SOL_SOCKET
)
1453 err
= sock_setsockopt(sock
, level
, optname
, optval
, optlen
);
1455 err
= sock
->ops
->setsockopt(sock
, level
, optname
, optval
,
1460 static inline void drbd_tcp_cork(struct socket
*sock
)
1463 (void) drbd_setsockopt(sock
, SOL_TCP
, TCP_CORK
,
1464 (char __user
*)&val
, sizeof(val
));
1467 static inline void drbd_tcp_uncork(struct socket
*sock
)
1470 (void) drbd_setsockopt(sock
, SOL_TCP
, TCP_CORK
,
1471 (char __user
*)&val
, sizeof(val
));
1474 static inline void drbd_tcp_nodelay(struct socket
*sock
)
1477 (void) drbd_setsockopt(sock
, SOL_TCP
, TCP_NODELAY
,
1478 (char __user
*)&val
, sizeof(val
));
1481 static inline void drbd_tcp_quickack(struct socket
*sock
)
1484 (void) drbd_setsockopt(sock
, SOL_TCP
, TCP_QUICKACK
,
1485 (char __user
*)&val
, sizeof(val
));
1488 void drbd_bump_write_ordering(struct drbd_conf
*mdev
, enum write_ordering_e wo
);
1491 extern struct proc_dir_entry
*drbd_proc
;
1492 extern const struct file_operations drbd_proc_fops
;
1493 extern const char *drbd_conn_str(enum drbd_conns s
);
1494 extern const char *drbd_role_str(enum drbd_role s
);
1497 extern void drbd_al_begin_io(struct drbd_conf
*mdev
, sector_t sector
);
1498 extern void drbd_al_complete_io(struct drbd_conf
*mdev
, sector_t sector
);
1499 extern void drbd_rs_complete_io(struct drbd_conf
*mdev
, sector_t sector
);
1500 extern int drbd_rs_begin_io(struct drbd_conf
*mdev
, sector_t sector
);
1501 extern int drbd_try_rs_begin_io(struct drbd_conf
*mdev
, sector_t sector
);
1502 extern void drbd_rs_cancel_all(struct drbd_conf
*mdev
);
1503 extern int drbd_rs_del_all(struct drbd_conf
*mdev
);
1504 extern void drbd_rs_failed_io(struct drbd_conf
*mdev
,
1505 sector_t sector
, int size
);
1506 extern int drbd_al_read_log(struct drbd_conf
*mdev
, struct drbd_backing_dev
*);
1507 extern void __drbd_set_in_sync(struct drbd_conf
*mdev
, sector_t sector
,
1508 int size
, const char *file
, const unsigned int line
);
1509 #define drbd_set_in_sync(mdev, sector, size) \
1510 __drbd_set_in_sync(mdev, sector, size, __FILE__, __LINE__)
1511 extern void __drbd_set_out_of_sync(struct drbd_conf
*mdev
, sector_t sector
,
1512 int size
, const char *file
, const unsigned int line
);
1513 #define drbd_set_out_of_sync(mdev, sector, size) \
1514 __drbd_set_out_of_sync(mdev, sector, size, __FILE__, __LINE__)
1515 extern void drbd_al_apply_to_bm(struct drbd_conf
*mdev
);
1516 extern void drbd_al_to_on_disk_bm(struct drbd_conf
*mdev
);
1517 extern void drbd_al_shrink(struct drbd_conf
*mdev
);
1522 void drbd_nl_cleanup(void);
1523 int __init
drbd_nl_init(void);
1524 void drbd_bcast_state(struct drbd_conf
*mdev
, union drbd_state
);
1525 void drbd_bcast_sync_progress(struct drbd_conf
*mdev
);
1526 void drbd_bcast_ee(struct drbd_conf
*mdev
,
1527 const char *reason
, const int dgs
,
1528 const char* seen_hash
, const char* calc_hash
,
1529 const struct drbd_epoch_entry
* e
);
1533 * DOC: DRBD State macros
1535 * These macros are used to express state changes in easily readable form.
1537 * The NS macros expand to a mask and a value, that can be bit ored onto the
1538 * current state as soon as the spinlock (req_lock) was taken.
1540 * The _NS macros are used for state functions that get called with the
1541 * spinlock. These macros expand directly to the new state value.
1543 * Besides the basic forms NS() and _NS() additional _?NS[23] are defined
1544 * to express state changes that affect more than one aspect of the state.
1546 * E.g. NS2(conn, C_CONNECTED, peer, R_SECONDARY)
1547 * Means that the network connection was established and that the peer
1548 * is in secondary role.
1550 #define role_MASK R_MASK
1551 #define peer_MASK R_MASK
1552 #define disk_MASK D_MASK
1553 #define pdsk_MASK D_MASK
1554 #define conn_MASK C_MASK
1556 #define user_isp_MASK 1
1557 #define aftr_isp_MASK 1
1560 ({ union drbd_state mask; mask.i = 0; mask.T = T##_MASK; mask; }), \
1561 ({ union drbd_state val; val.i = 0; val.T = (S); val; })
1562 #define NS2(T1, S1, T2, S2) \
1563 ({ union drbd_state mask; mask.i = 0; mask.T1 = T1##_MASK; \
1564 mask.T2 = T2##_MASK; mask; }), \
1565 ({ union drbd_state val; val.i = 0; val.T1 = (S1); \
1566 val.T2 = (S2); val; })
1567 #define NS3(T1, S1, T2, S2, T3, S3) \
1568 ({ union drbd_state mask; mask.i = 0; mask.T1 = T1##_MASK; \
1569 mask.T2 = T2##_MASK; mask.T3 = T3##_MASK; mask; }), \
1570 ({ union drbd_state val; val.i = 0; val.T1 = (S1); \
1571 val.T2 = (S2); val.T3 = (S3); val; })
1573 #define _NS(D, T, S) \
1574 D, ({ union drbd_state __ns; __ns.i = D->state.i; __ns.T = (S); __ns; })
1575 #define _NS2(D, T1, S1, T2, S2) \
1576 D, ({ union drbd_state __ns; __ns.i = D->state.i; __ns.T1 = (S1); \
1577 __ns.T2 = (S2); __ns; })
1578 #define _NS3(D, T1, S1, T2, S2, T3, S3) \
1579 D, ({ union drbd_state __ns; __ns.i = D->state.i; __ns.T1 = (S1); \
1580 __ns.T2 = (S2); __ns.T3 = (S3); __ns; })
1583 * inline helper functions
1584 *************************/
1586 static inline void drbd_state_lock(struct drbd_conf
*mdev
)
1588 wait_event(mdev
->misc_wait
,
1589 !test_and_set_bit(CLUSTER_ST_CHANGE
, &mdev
->flags
));
1592 static inline void drbd_state_unlock(struct drbd_conf
*mdev
)
1594 clear_bit(CLUSTER_ST_CHANGE
, &mdev
->flags
);
1595 wake_up(&mdev
->misc_wait
);
1598 static inline int _drbd_set_state(struct drbd_conf
*mdev
,
1599 union drbd_state ns
, enum chg_state_flags flags
,
1600 struct completion
*done
)
1604 read_lock(&global_state_lock
);
1605 rv
= __drbd_set_state(mdev
, ns
, flags
, done
);
1606 read_unlock(&global_state_lock
);
1612 * drbd_request_state() - Reqest a state change
1613 * @mdev: DRBD device.
1614 * @mask: mask of state bits to change.
1615 * @val: value of new state bits.
1617 * This is the most graceful way of requesting a state change. It is verbose
1618 * quite verbose in case the state change is not possible, and all those
1619 * state changes are globally serialized.
1621 static inline int drbd_request_state(struct drbd_conf
*mdev
,
1622 union drbd_state mask
,
1623 union drbd_state val
)
1625 return _drbd_request_state(mdev
, mask
, val
, CS_VERBOSE
+ CS_ORDERED
);
1628 #define __drbd_chk_io_error(m,f) __drbd_chk_io_error_(m,f, __func__)
1629 static inline void __drbd_chk_io_error_(struct drbd_conf
*mdev
, int forcedetach
, const char *where
)
1631 switch (mdev
->ldev
->dc
.on_io_error
) {
1634 if (printk_ratelimit())
1635 dev_err(DEV
, "Local IO failed in %s."
1636 "Passing error on...\n", where
);
1639 /* NOTE fall through to detach case if forcedetach set */
1641 case EP_CALL_HELPER
:
1642 if (mdev
->state
.disk
> D_FAILED
) {
1643 _drbd_set_state(_NS(mdev
, disk
, D_FAILED
), CS_HARD
, NULL
);
1644 dev_err(DEV
, "Local IO failed in %s."
1645 "Detaching...\n", where
);
1652 * drbd_chk_io_error: Handle the on_io_error setting, should be called from all io completion handlers
1653 * @mdev: DRBD device.
1654 * @error: Error code passed to the IO completion callback
1655 * @forcedetach: Force detach. I.e. the error happened while accessing the meta data
1657 * See also drbd_main.c:after_state_ch() if (os.disk > D_FAILED && ns.disk == D_FAILED)
1659 #define drbd_chk_io_error(m,e,f) drbd_chk_io_error_(m,e,f, __func__)
1660 static inline void drbd_chk_io_error_(struct drbd_conf
*mdev
,
1661 int error
, int forcedetach
, const char *where
)
1664 unsigned long flags
;
1665 spin_lock_irqsave(&mdev
->req_lock
, flags
);
1666 __drbd_chk_io_error_(mdev
, forcedetach
, where
);
1667 spin_unlock_irqrestore(&mdev
->req_lock
, flags
);
1673 * drbd_md_first_sector() - Returns the first sector number of the meta data area
1674 * @bdev: Meta data block device.
1676 * BTW, for internal meta data, this happens to be the maximum capacity
1677 * we could agree upon with our peer node.
1679 static inline sector_t
drbd_md_first_sector(struct drbd_backing_dev
*bdev
)
1681 switch (bdev
->dc
.meta_dev_idx
) {
1682 case DRBD_MD_INDEX_INTERNAL
:
1683 case DRBD_MD_INDEX_FLEX_INT
:
1684 return bdev
->md
.md_offset
+ bdev
->md
.bm_offset
;
1685 case DRBD_MD_INDEX_FLEX_EXT
:
1687 return bdev
->md
.md_offset
;
1692 * drbd_md_last_sector() - Return the last sector number of the meta data area
1693 * @bdev: Meta data block device.
1695 static inline sector_t
drbd_md_last_sector(struct drbd_backing_dev
*bdev
)
1697 switch (bdev
->dc
.meta_dev_idx
) {
1698 case DRBD_MD_INDEX_INTERNAL
:
1699 case DRBD_MD_INDEX_FLEX_INT
:
1700 return bdev
->md
.md_offset
+ MD_AL_OFFSET
- 1;
1701 case DRBD_MD_INDEX_FLEX_EXT
:
1703 return bdev
->md
.md_offset
+ bdev
->md
.md_size_sect
;
1707 /* Returns the number of 512 byte sectors of the device */
1708 static inline sector_t
drbd_get_capacity(struct block_device
*bdev
)
1710 /* return bdev ? get_capacity(bdev->bd_disk) : 0; */
1711 return bdev
? bdev
->bd_inode
->i_size
>> 9 : 0;
1715 * drbd_get_max_capacity() - Returns the capacity we announce to out peer
1716 * @bdev: Meta data block device.
1718 * returns the capacity we announce to out peer. we clip ourselves at the
1719 * various MAX_SECTORS, because if we don't, current implementation will
1720 * oops sooner or later
1722 static inline sector_t
drbd_get_max_capacity(struct drbd_backing_dev
*bdev
)
1725 switch (bdev
->dc
.meta_dev_idx
) {
1726 case DRBD_MD_INDEX_INTERNAL
:
1727 case DRBD_MD_INDEX_FLEX_INT
:
1728 s
= drbd_get_capacity(bdev
->backing_bdev
)
1729 ? min_t(sector_t
, DRBD_MAX_SECTORS_FLEX
,
1730 drbd_md_first_sector(bdev
))
1733 case DRBD_MD_INDEX_FLEX_EXT
:
1734 s
= min_t(sector_t
, DRBD_MAX_SECTORS_FLEX
,
1735 drbd_get_capacity(bdev
->backing_bdev
));
1736 /* clip at maximum size the meta device can support */
1737 s
= min_t(sector_t
, s
,
1738 BM_EXT_TO_SECT(bdev
->md
.md_size_sect
1739 - bdev
->md
.bm_offset
));
1742 s
= min_t(sector_t
, DRBD_MAX_SECTORS
,
1743 drbd_get_capacity(bdev
->backing_bdev
));
1749 * drbd_md_ss__() - Return the sector number of our meta data super block
1750 * @mdev: DRBD device.
1751 * @bdev: Meta data block device.
1753 static inline sector_t
drbd_md_ss__(struct drbd_conf
*mdev
,
1754 struct drbd_backing_dev
*bdev
)
1756 switch (bdev
->dc
.meta_dev_idx
) {
1757 default: /* external, some index */
1758 return MD_RESERVED_SECT
* bdev
->dc
.meta_dev_idx
;
1759 case DRBD_MD_INDEX_INTERNAL
:
1760 /* with drbd08, internal meta data is always "flexible" */
1761 case DRBD_MD_INDEX_FLEX_INT
:
1762 /* sizeof(struct md_on_disk_07) == 4k
1763 * position: last 4k aligned block of 4k size */
1764 if (!bdev
->backing_bdev
) {
1765 if (__ratelimit(&drbd_ratelimit_state
)) {
1766 dev_err(DEV
, "bdev->backing_bdev==NULL\n");
1771 return (drbd_get_capacity(bdev
->backing_bdev
) & ~7ULL)
1773 case DRBD_MD_INDEX_FLEX_EXT
:
1779 _drbd_queue_work(struct drbd_work_queue
*q
, struct drbd_work
*w
)
1781 list_add_tail(&w
->list
, &q
->q
);
1786 drbd_queue_work_front(struct drbd_work_queue
*q
, struct drbd_work
*w
)
1788 unsigned long flags
;
1789 spin_lock_irqsave(&q
->q_lock
, flags
);
1790 list_add(&w
->list
, &q
->q
);
1791 up(&q
->s
); /* within the spinlock,
1792 see comment near end of drbd_worker() */
1793 spin_unlock_irqrestore(&q
->q_lock
, flags
);
1797 drbd_queue_work(struct drbd_work_queue
*q
, struct drbd_work
*w
)
1799 unsigned long flags
;
1800 spin_lock_irqsave(&q
->q_lock
, flags
);
1801 list_add_tail(&w
->list
, &q
->q
);
1802 up(&q
->s
); /* within the spinlock,
1803 see comment near end of drbd_worker() */
1804 spin_unlock_irqrestore(&q
->q_lock
, flags
);
1807 static inline void wake_asender(struct drbd_conf
*mdev
)
1809 if (test_bit(SIGNAL_ASENDER
, &mdev
->flags
))
1810 force_sig(DRBD_SIG
, mdev
->asender
.task
);
1813 static inline void request_ping(struct drbd_conf
*mdev
)
1815 set_bit(SEND_PING
, &mdev
->flags
);
1819 static inline int drbd_send_short_cmd(struct drbd_conf
*mdev
,
1820 enum drbd_packets cmd
)
1823 return drbd_send_cmd(mdev
, USE_DATA_SOCKET
, cmd
, &h
, sizeof(h
));
1826 static inline int drbd_send_ping(struct drbd_conf
*mdev
)
1829 return drbd_send_cmd(mdev
, USE_META_SOCKET
, P_PING
, &h
, sizeof(h
));
1832 static inline int drbd_send_ping_ack(struct drbd_conf
*mdev
)
1835 return drbd_send_cmd(mdev
, USE_META_SOCKET
, P_PING_ACK
, &h
, sizeof(h
));
1838 static inline void drbd_thread_stop(struct drbd_thread
*thi
)
1840 _drbd_thread_stop(thi
, FALSE
, TRUE
);
1843 static inline void drbd_thread_stop_nowait(struct drbd_thread
*thi
)
1845 _drbd_thread_stop(thi
, FALSE
, FALSE
);
1848 static inline void drbd_thread_restart_nowait(struct drbd_thread
*thi
)
1850 _drbd_thread_stop(thi
, TRUE
, FALSE
);
1853 /* counts how many answer packets packets we expect from our peer,
1854 * for either explicit application requests,
1855 * or implicit barrier packets as necessary.
1858 * _req_mod(req, queue_for_net_write or queue_for_net_read);
1859 * it is much easier and equally valid to count what we queue for the
1860 * worker, even before it actually was queued or send.
1861 * (drbd_make_request_common; recovery path on read io-error)
1863 * got_BarrierAck (respective tl_clear, tl_clear_barrier)
1864 * _req_mod(req, data_received)
1865 * [from receive_DataReply]
1866 * _req_mod(req, write_acked_by_peer or recv_acked_by_peer or neg_acked)
1867 * [from got_BlockAck (P_WRITE_ACK, P_RECV_ACK)]
1868 * for some reason it is NOT decreased in got_NegAck,
1869 * but in the resulting cleanup code from report_params.
1870 * we should try to remember the reason for that...
1871 * _req_mod(req, send_failed or send_canceled)
1872 * _req_mod(req, connection_lost_while_pending)
1873 * [from tl_clear_barrier]
1875 static inline void inc_ap_pending(struct drbd_conf
*mdev
)
1877 atomic_inc(&mdev
->ap_pending_cnt
);
1880 #define ERR_IF_CNT_IS_NEGATIVE(which) \
1881 if (atomic_read(&mdev->which) < 0) \
1882 dev_err(DEV, "in %s:%d: " #which " = %d < 0 !\n", \
1883 __func__ , __LINE__ , \
1884 atomic_read(&mdev->which))
1886 #define dec_ap_pending(mdev) do { \
1887 typecheck(struct drbd_conf *, mdev); \
1888 if (atomic_dec_and_test(&mdev->ap_pending_cnt)) \
1889 wake_up(&mdev->misc_wait); \
1890 ERR_IF_CNT_IS_NEGATIVE(ap_pending_cnt); } while (0)
1892 /* counts how many resync-related answers we still expect from the peer
1894 * C_SYNC_TARGET sends P_RS_DATA_REQUEST (and expects P_RS_DATA_REPLY)
1895 * C_SYNC_SOURCE sends P_RS_DATA_REPLY (and expects P_WRITE_ACK whith ID_SYNCER)
1896 * (or P_NEG_ACK with ID_SYNCER)
1898 static inline void inc_rs_pending(struct drbd_conf
*mdev
)
1900 atomic_inc(&mdev
->rs_pending_cnt
);
1903 #define dec_rs_pending(mdev) do { \
1904 typecheck(struct drbd_conf *, mdev); \
1905 atomic_dec(&mdev->rs_pending_cnt); \
1906 ERR_IF_CNT_IS_NEGATIVE(rs_pending_cnt); } while (0)
1908 /* counts how many answers we still need to send to the peer.
1910 * receive_Data unless protocol A;
1911 * we need to send a P_RECV_ACK (proto B)
1912 * or P_WRITE_ACK (proto C)
1913 * receive_RSDataReply (recv_resync_read) we need to send a P_WRITE_ACK
1914 * receive_DataRequest (receive_RSDataRequest) we need to send back P_DATA
1915 * receive_Barrier_* we need to send a P_BARRIER_ACK
1917 static inline void inc_unacked(struct drbd_conf
*mdev
)
1919 atomic_inc(&mdev
->unacked_cnt
);
1922 #define dec_unacked(mdev) do { \
1923 typecheck(struct drbd_conf *, mdev); \
1924 atomic_dec(&mdev->unacked_cnt); \
1925 ERR_IF_CNT_IS_NEGATIVE(unacked_cnt); } while (0)
1927 #define sub_unacked(mdev, n) do { \
1928 typecheck(struct drbd_conf *, mdev); \
1929 atomic_sub(n, &mdev->unacked_cnt); \
1930 ERR_IF_CNT_IS_NEGATIVE(unacked_cnt); } while (0)
1933 static inline void put_net_conf(struct drbd_conf
*mdev
)
1935 if (atomic_dec_and_test(&mdev
->net_cnt
))
1936 wake_up(&mdev
->misc_wait
);
1940 * get_net_conf() - Increase ref count on mdev->net_conf; Returns 0 if nothing there
1941 * @mdev: DRBD device.
1943 * You have to call put_net_conf() when finished working with mdev->net_conf.
1945 static inline int get_net_conf(struct drbd_conf
*mdev
)
1949 atomic_inc(&mdev
->net_cnt
);
1950 have_net_conf
= mdev
->state
.conn
>= C_UNCONNECTED
;
1953 return have_net_conf
;
1957 * get_ldev() - Increase the ref count on mdev->ldev. Returns 0 if there is no ldev
1960 * You have to call put_ldev() when finished working with mdev->ldev.
1962 #define get_ldev(M) __cond_lock(local, _get_ldev_if_state(M,D_INCONSISTENT))
1963 #define get_ldev_if_state(M,MINS) __cond_lock(local, _get_ldev_if_state(M,MINS))
1965 static inline void put_ldev(struct drbd_conf
*mdev
)
1968 if (atomic_dec_and_test(&mdev
->local_cnt
))
1969 wake_up(&mdev
->misc_wait
);
1970 D_ASSERT(atomic_read(&mdev
->local_cnt
) >= 0);
1974 static inline int _get_ldev_if_state(struct drbd_conf
*mdev
, enum drbd_disk_state mins
)
1978 atomic_inc(&mdev
->local_cnt
);
1979 io_allowed
= (mdev
->state
.disk
>= mins
);
1985 extern int _get_ldev_if_state(struct drbd_conf
*mdev
, enum drbd_disk_state mins
);
1988 /* you must have an "get_ldev" reference */
1989 static inline void drbd_get_syncer_progress(struct drbd_conf
*mdev
,
1990 unsigned long *bits_left
, unsigned int *per_mil_done
)
1993 * this is to break it at compile time when we change that
1994 * (we may feel 4TB maximum storage per drbd is not enough)
1996 typecheck(unsigned long, mdev
->rs_total
);
1998 /* note: both rs_total and rs_left are in bits, i.e. in
1999 * units of BM_BLOCK_SIZE.
2000 * for the percentage, we don't care. */
2002 *bits_left
= drbd_bm_total_weight(mdev
) - mdev
->rs_failed
;
2003 /* >> 10 to prevent overflow,
2004 * +1 to prevent division by zero */
2005 if (*bits_left
> mdev
->rs_total
) {
2006 /* doh. maybe a logic bug somewhere.
2007 * may also be just a race condition
2008 * between this and a disconnect during sync.
2009 * for now, just prevent in-kernel buffer overflow.
2012 dev_warn(DEV
, "cs:%s rs_left=%lu > rs_total=%lu (rs_failed %lu)\n",
2013 drbd_conn_str(mdev
->state
.conn
),
2014 *bits_left
, mdev
->rs_total
, mdev
->rs_failed
);
2017 /* make sure the calculation happens in long context */
2018 unsigned long tmp
= 1000UL -
2019 (*bits_left
>> 10)*1000UL
2020 / ((mdev
->rs_total
>> 10) + 1UL);
2021 *per_mil_done
= tmp
;
2026 /* this throttles on-the-fly application requests
2027 * according to max_buffers settings;
2028 * maybe re-implement using semaphores? */
2029 static inline int drbd_get_max_buffers(struct drbd_conf
*mdev
)
2031 int mxb
= 1000000; /* arbitrary limit on open requests */
2032 if (get_net_conf(mdev
)) {
2033 mxb
= mdev
->net_conf
->max_buffers
;
2039 static inline int drbd_state_is_stable(union drbd_state s
)
2042 /* DO NOT add a default clause, we want the compiler to warn us
2043 * for any newly introduced state we may have forgotten to add here */
2045 switch ((enum drbd_conns
)s
.conn
) {
2046 /* new io only accepted when there is no connection, ... */
2048 case C_WF_CONNECTION
:
2049 /* ... or there is a well established connection. */
2055 case C_PAUSED_SYNC_S
:
2056 case C_PAUSED_SYNC_T
:
2057 /* maybe stable, look at the disk state */
2060 /* no new io accepted during tansitional states
2061 * like handshake or teardown */
2062 case C_DISCONNECTING
:
2066 case C_NETWORK_FAILURE
:
2067 case C_PROTOCOL_ERROR
:
2069 case C_WF_REPORT_PARAMS
:
2070 case C_STARTING_SYNC_S
:
2071 case C_STARTING_SYNC_T
:
2074 case C_WF_SYNC_UUID
:
2080 switch ((enum drbd_disk_state
)s
.disk
) {
2082 case D_INCONSISTENT
:
2086 /* disk state is stable as well. */
2089 /* no new io accepted during tansitional states */
2102 static inline int __inc_ap_bio_cond(struct drbd_conf
*mdev
)
2104 int mxb
= drbd_get_max_buffers(mdev
);
2106 if (mdev
->state
.susp
)
2108 if (test_bit(SUSPEND_IO
, &mdev
->flags
))
2111 /* to avoid potential deadlock or bitmap corruption,
2112 * in various places, we only allow new application io
2113 * to start during "stable" states. */
2115 /* no new io accepted when attaching or detaching the disk */
2116 if (!drbd_state_is_stable(mdev
->state
))
2119 /* since some older kernels don't have atomic_add_unless,
2120 * and we are within the spinlock anyways, we have this workaround. */
2121 if (atomic_read(&mdev
->ap_bio_cnt
) > mxb
)
2123 if (test_bit(BITMAP_IO
, &mdev
->flags
))
2128 /* I'd like to use wait_event_lock_irq,
2129 * but I'm not sure when it got introduced,
2130 * and not sure when it has 3 or 4 arguments */
2131 static inline void inc_ap_bio(struct drbd_conf
*mdev
, int one_or_two
)
2133 /* compare with after_state_ch,
2134 * os.conn != C_WF_BITMAP_S && ns.conn == C_WF_BITMAP_S */
2138 * as long as the device is suspended
2139 * until the bitmap is no longer on the fly during connection
2140 * handshake as long as we would exeed the max_buffer limit.
2142 * to avoid races with the reconnect code,
2143 * we need to atomic_inc within the spinlock. */
2145 spin_lock_irq(&mdev
->req_lock
);
2146 while (!__inc_ap_bio_cond(mdev
)) {
2147 prepare_to_wait(&mdev
->misc_wait
, &wait
, TASK_UNINTERRUPTIBLE
);
2148 spin_unlock_irq(&mdev
->req_lock
);
2150 finish_wait(&mdev
->misc_wait
, &wait
);
2151 spin_lock_irq(&mdev
->req_lock
);
2153 atomic_add(one_or_two
, &mdev
->ap_bio_cnt
);
2154 spin_unlock_irq(&mdev
->req_lock
);
2157 static inline void dec_ap_bio(struct drbd_conf
*mdev
)
2159 int mxb
= drbd_get_max_buffers(mdev
);
2160 int ap_bio
= atomic_dec_return(&mdev
->ap_bio_cnt
);
2162 D_ASSERT(ap_bio
>= 0);
2163 /* this currently does wake_up for every dec_ap_bio!
2164 * maybe rather introduce some type of hysteresis?
2165 * e.g. (ap_bio == mxb/2 || ap_bio == 0) ? */
2167 wake_up(&mdev
->misc_wait
);
2168 if (ap_bio
== 0 && test_bit(BITMAP_IO
, &mdev
->flags
)) {
2169 if (!test_and_set_bit(BITMAP_IO_QUEUED
, &mdev
->flags
))
2170 drbd_queue_work(&mdev
->data
.work
, &mdev
->bm_io_work
.w
);
2174 static inline void drbd_set_ed_uuid(struct drbd_conf
*mdev
, u64 val
)
2176 mdev
->ed_uuid
= val
;
2179 static inline int seq_cmp(u32 a
, u32 b
)
2181 /* we assume wrap around at 32bit.
2182 * for wrap around at 24bit (old atomic_t),
2186 return (s32
)(a
) - (s32
)(b
);
2188 #define seq_lt(a, b) (seq_cmp((a), (b)) < 0)
2189 #define seq_gt(a, b) (seq_cmp((a), (b)) > 0)
2190 #define seq_ge(a, b) (seq_cmp((a), (b)) >= 0)
2191 #define seq_le(a, b) (seq_cmp((a), (b)) <= 0)
2192 /* CAUTION: please no side effects in arguments! */
2193 #define seq_max(a, b) ((u32)(seq_gt((a), (b)) ? (a) : (b)))
2195 static inline void update_peer_seq(struct drbd_conf
*mdev
, unsigned int new_seq
)
2198 spin_lock(&mdev
->peer_seq_lock
);
2199 m
= seq_max(mdev
->peer_seq
, new_seq
);
2201 spin_unlock(&mdev
->peer_seq_lock
);
2203 wake_up(&mdev
->seq_wait
);
2206 static inline void drbd_update_congested(struct drbd_conf
*mdev
)
2208 struct sock
*sk
= mdev
->data
.socket
->sk
;
2209 if (sk
->sk_wmem_queued
> sk
->sk_sndbuf
* 4 / 5)
2210 set_bit(NET_CONGESTED
, &mdev
->flags
);
2213 static inline int drbd_queue_order_type(struct drbd_conf
*mdev
)
2215 /* sorry, we currently have no working implementation
2216 * of distributed TCQ stuff */
2217 #ifndef QUEUE_ORDERED_NONE
2218 #define QUEUE_ORDERED_NONE 0
2220 return QUEUE_ORDERED_NONE
;
2223 static inline void drbd_blk_run_queue(struct request_queue
*q
)
2225 if (q
&& q
->unplug_fn
)
2229 static inline void drbd_kick_lo(struct drbd_conf
*mdev
)
2231 if (get_ldev(mdev
)) {
2232 drbd_blk_run_queue(bdev_get_queue(mdev
->ldev
->backing_bdev
));
2237 static inline void drbd_md_flush(struct drbd_conf
*mdev
)
2241 if (test_bit(MD_NO_BARRIER
, &mdev
->flags
))
2244 r
= blkdev_issue_flush(mdev
->ldev
->md_bdev
, NULL
);
2246 set_bit(MD_NO_BARRIER
, &mdev
->flags
);
2247 dev_err(DEV
, "meta data flush failed with status %d, disabling md-flushes\n", r
);