diff options
Diffstat (limited to 'drivers/block/drbd/drbd_int.h')
| -rw-r--r-- | drivers/block/drbd/drbd_int.h | 2488 |
1 files changed, 1151 insertions, 1337 deletions
diff --git a/drivers/block/drbd/drbd_int.h b/drivers/block/drbd/drbd_int.h index 1ea1a34e78b..a76ceb344d6 100644 --- a/drivers/block/drbd/drbd_int.h +++ b/drivers/block/drbd/drbd_int.h @@ -28,7 +28,6 @@ #include <linux/compiler.h> #include <linux/types.h> -#include <linux/version.h> #include <linux/list.h> #include <linux/sched.h> #include <linux/bitops.h> @@ -40,8 +39,15 @@ #include <linux/major.h> #include <linux/blkdev.h> #include <linux/genhd.h> +#include <linux/idr.h> #include <net/tcp.h> #include <linux/lru_cache.h> +#include <linux/prefetch.h> +#include <linux/drbd_genl_api.h> +#include <linux/drbd.h> +#include "drbd_strings.h" +#include "drbd_state.h" +#include "drbd_protocol.h" #ifdef __CHECKER__ # define __protected_by(x) __attribute__((require_context(x,1,999,"rdwr"))) @@ -59,9 +65,9 @@ /* module parameter, defined in drbd_main.c */ extern unsigned int minor_count; -extern int disable_sendpage; -extern int allow_oos; -extern unsigned int cn_idx; +extern bool disable_sendpage; +extern bool allow_oos; +void tl_abort_disk_io(struct drbd_device *device); #ifdef CONFIG_DRBD_FAULT_INJECTION extern int enable_faults; @@ -72,13 +78,6 @@ extern int fault_devs; extern char usermode_helper[]; -#ifndef TRUE -#define TRUE 1 -#endif -#ifndef FALSE -#define FALSE 0 -#endif - /* I don't remember why XCPU ... * This is used to wake the asender, * and to interrupt sending the sending task @@ -93,33 +92,79 @@ extern char usermode_helper[]; */ #define DRBD_SIGKILL SIGHUP -/* All EEs on the free list should have ID_VACANT (== 0) - * freshly allocated EEs get !ID_VACANT (== 1) - * so if it says "cannot dereference null pointer at address 0x00000001", - * it is most likely one of these :( */ - #define ID_IN_SYNC (4711ULL) #define ID_OUT_OF_SYNC (4712ULL) - #define ID_SYNCER (-1ULL) -#define ID_VACANT 0 -#define is_syncer_block_id(id) ((id) == ID_SYNCER) - -struct drbd_conf; +#define UUID_NEW_BM_OFFSET ((u64)0x0001000000000000ULL) + +struct drbd_device; +struct drbd_connection; + +#define __drbd_printk_device(level, device, fmt, args...) \ + dev_printk(level, disk_to_dev((device)->vdisk), fmt, ## args) +#define __drbd_printk_peer_device(level, peer_device, fmt, args...) \ + dev_printk(level, disk_to_dev((peer_device)->device->vdisk), fmt, ## args) +#define __drbd_printk_resource(level, resource, fmt, args...) \ + printk(level "drbd %s: " fmt, (resource)->name, ## args) +#define __drbd_printk_connection(level, connection, fmt, args...) \ + printk(level "drbd %s: " fmt, (connection)->resource->name, ## args) + +void drbd_printk_with_wrong_object_type(void); + +#define __drbd_printk_if_same_type(obj, type, func, level, fmt, args...) \ + (__builtin_types_compatible_p(typeof(obj), type) || \ + __builtin_types_compatible_p(typeof(obj), const type)), \ + func(level, (const type)(obj), fmt, ## args) + +#define drbd_printk(level, obj, fmt, args...) \ + __builtin_choose_expr( \ + __drbd_printk_if_same_type(obj, struct drbd_device *, \ + __drbd_printk_device, level, fmt, ## args), \ + __builtin_choose_expr( \ + __drbd_printk_if_same_type(obj, struct drbd_resource *, \ + __drbd_printk_resource, level, fmt, ## args), \ + __builtin_choose_expr( \ + __drbd_printk_if_same_type(obj, struct drbd_connection *, \ + __drbd_printk_connection, level, fmt, ## args), \ + __builtin_choose_expr( \ + __drbd_printk_if_same_type(obj, struct drbd_peer_device *, \ + __drbd_printk_peer_device, level, fmt, ## args), \ + drbd_printk_with_wrong_object_type())))) + +#define drbd_dbg(obj, fmt, args...) \ + drbd_printk(KERN_DEBUG, obj, fmt, ## args) +#define drbd_alert(obj, fmt, args...) \ + drbd_printk(KERN_ALERT, obj, fmt, ## args) +#define drbd_err(obj, fmt, args...) \ + drbd_printk(KERN_ERR, obj, fmt, ## args) +#define drbd_warn(obj, fmt, args...) \ + drbd_printk(KERN_WARNING, obj, fmt, ## args) +#define drbd_info(obj, fmt, args...) \ + drbd_printk(KERN_INFO, obj, fmt, ## args) +#define drbd_emerg(obj, fmt, args...) \ + drbd_printk(KERN_EMERG, obj, fmt, ## args) + +#define dynamic_drbd_dbg(device, fmt, args...) \ + dynamic_dev_dbg(disk_to_dev(device->vdisk), fmt, ## args) + +#define D_ASSERT(device, exp) do { \ + if (!(exp)) \ + drbd_err(device, "ASSERT( " #exp " ) in %s:%d\n", __FILE__, __LINE__); \ + } while (0) -/* to shorten dev_warn(DEV, "msg"); and relatives statements */ -#define DEV (disk_to_dev(mdev->vdisk)) - -#define D_ASSERT(exp) if (!(exp)) \ - dev_err(DEV, "ASSERT( " #exp " ) in %s:%d\n", __FILE__, __LINE__) - -#define ERR_IF(exp) if (({ \ - int _b = (exp) != 0; \ - if (_b) dev_err(DEV, "ASSERT FAILED: %s: (%s) in %s:%d\n", \ - __func__, #exp, __FILE__, __LINE__); \ - _b; \ - })) +/** + * expect - Make an assertion + * + * Unlike the assert macro, this macro returns a boolean result. + */ +#define expect(exp) ({ \ + bool _bool = (exp); \ + if (!_bool) \ + drbd_err(device, "ASSERTION %s FAILED in %s\n", \ + #exp, __func__); \ + _bool; \ + }) /* Defines to control fault insertion */ enum { @@ -137,151 +182,30 @@ enum { DRBD_FAULT_MAX, }; -#ifdef CONFIG_DRBD_FAULT_INJECTION extern unsigned int -_drbd_insert_fault(struct drbd_conf *mdev, unsigned int type); +_drbd_insert_fault(struct drbd_device *device, unsigned int type); + static inline int -drbd_insert_fault(struct drbd_conf *mdev, unsigned int type) { +drbd_insert_fault(struct drbd_device *device, unsigned int type) { +#ifdef CONFIG_DRBD_FAULT_INJECTION return fault_rate && (enable_faults & (1<<type)) && - _drbd_insert_fault(mdev, type); -} -#define FAULT_ACTIVE(_m, _t) (drbd_insert_fault((_m), (_t))) - + _drbd_insert_fault(device, type); #else -#define FAULT_ACTIVE(_m, _t) (0) + return 0; #endif +} /* integer division, round _UP_ to the next integer */ #define div_ceil(A, B) ((A)/(B) + ((A)%(B) ? 1 : 0)) /* usual integer division */ #define div_floor(A, B) ((A)/(B)) -/* drbd_meta-data.c (still in drbd_main.c) */ -/* 4th incarnation of the disk layout. */ -#define DRBD_MD_MAGIC (DRBD_MAGIC+4) - -extern struct drbd_conf **minor_table; extern struct ratelimit_state drbd_ratelimit_state; +extern struct idr drbd_devices; /* RCU, updates: genl_lock() */ +extern struct list_head drbd_resources; /* RCU, updates: genl_lock() */ -/* on the wire */ -enum drbd_packets { - /* receiver (data socket) */ - P_DATA = 0x00, - P_DATA_REPLY = 0x01, /* Response to P_DATA_REQUEST */ - P_RS_DATA_REPLY = 0x02, /* Response to P_RS_DATA_REQUEST */ - P_BARRIER = 0x03, - P_BITMAP = 0x04, - P_BECOME_SYNC_TARGET = 0x05, - P_BECOME_SYNC_SOURCE = 0x06, - P_UNPLUG_REMOTE = 0x07, /* Used at various times to hint the peer */ - P_DATA_REQUEST = 0x08, /* Used to ask for a data block */ - P_RS_DATA_REQUEST = 0x09, /* Used to ask for a data block for resync */ - P_SYNC_PARAM = 0x0a, - P_PROTOCOL = 0x0b, - P_UUIDS = 0x0c, - P_SIZES = 0x0d, - P_STATE = 0x0e, - P_SYNC_UUID = 0x0f, - P_AUTH_CHALLENGE = 0x10, - P_AUTH_RESPONSE = 0x11, - P_STATE_CHG_REQ = 0x12, - - /* asender (meta socket */ - P_PING = 0x13, - P_PING_ACK = 0x14, - P_RECV_ACK = 0x15, /* Used in protocol B */ - P_WRITE_ACK = 0x16, /* Used in protocol C */ - P_RS_WRITE_ACK = 0x17, /* Is a P_WRITE_ACK, additionally call set_in_sync(). */ - P_DISCARD_ACK = 0x18, /* Used in proto C, two-primaries conflict detection */ - P_NEG_ACK = 0x19, /* Sent if local disk is unusable */ - P_NEG_DREPLY = 0x1a, /* Local disk is broken... */ - P_NEG_RS_DREPLY = 0x1b, /* Local disk is broken... */ - P_BARRIER_ACK = 0x1c, - P_STATE_CHG_REPLY = 0x1d, - - /* "new" commands, no longer fitting into the ordering scheme above */ - - P_OV_REQUEST = 0x1e, /* data socket */ - P_OV_REPLY = 0x1f, - P_OV_RESULT = 0x20, /* meta socket */ - P_CSUM_RS_REQUEST = 0x21, /* data socket */ - P_RS_IS_IN_SYNC = 0x22, /* meta socket */ - P_SYNC_PARAM89 = 0x23, /* data socket, protocol version 89 replacement for P_SYNC_PARAM */ - P_COMPRESSED_BITMAP = 0x24, /* compressed or otherwise encoded bitmap transfer */ - /* P_CKPT_FENCE_REQ = 0x25, * currently reserved for protocol D */ - /* P_CKPT_DISABLE_REQ = 0x26, * currently reserved for protocol D */ - P_DELAY_PROBE = 0x27, /* is used on BOTH sockets */ - - P_MAX_CMD = 0x28, - P_MAY_IGNORE = 0x100, /* Flag to test if (cmd > P_MAY_IGNORE) ... */ - P_MAX_OPT_CMD = 0x101, - - /* special command ids for handshake */ - - P_HAND_SHAKE_M = 0xfff1, /* First Packet on the MetaSock */ - P_HAND_SHAKE_S = 0xfff2, /* First Packet on the Socket */ - - P_HAND_SHAKE = 0xfffe /* FIXED for the next century! */ -}; - -static inline const char *cmdname(enum drbd_packets cmd) -{ - /* THINK may need to become several global tables - * when we want to support more than - * one PRO_VERSION */ - static const char *cmdnames[] = { - [P_DATA] = "Data", - [P_DATA_REPLY] = "DataReply", - [P_RS_DATA_REPLY] = "RSDataReply", - [P_BARRIER] = "Barrier", - [P_BITMAP] = "ReportBitMap", - [P_BECOME_SYNC_TARGET] = "BecomeSyncTarget", - [P_BECOME_SYNC_SOURCE] = "BecomeSyncSource", - [P_UNPLUG_REMOTE] = "UnplugRemote", - [P_DATA_REQUEST] = "DataRequest", - [P_RS_DATA_REQUEST] = "RSDataRequest", - [P_SYNC_PARAM] = "SyncParam", - [P_SYNC_PARAM89] = "SyncParam89", - [P_PROTOCOL] = "ReportProtocol", - [P_UUIDS] = "ReportUUIDs", - [P_SIZES] = "ReportSizes", - [P_STATE] = "ReportState", - [P_SYNC_UUID] = "ReportSyncUUID", - [P_AUTH_CHALLENGE] = "AuthChallenge", - [P_AUTH_RESPONSE] = "AuthResponse", - [P_PING] = "Ping", - [P_PING_ACK] = "PingAck", - [P_RECV_ACK] = "RecvAck", - [P_WRITE_ACK] = "WriteAck", - [P_RS_WRITE_ACK] = "RSWriteAck", - [P_DISCARD_ACK] = "DiscardAck", - [P_NEG_ACK] = "NegAck", - [P_NEG_DREPLY] = "NegDReply", - [P_NEG_RS_DREPLY] = "NegRSDReply", - [P_BARRIER_ACK] = "BarrierAck", - [P_STATE_CHG_REQ] = "StateChgRequest", - [P_STATE_CHG_REPLY] = "StateChgReply", - [P_OV_REQUEST] = "OVRequest", - [P_OV_REPLY] = "OVReply", - [P_OV_RESULT] = "OVResult", - [P_CSUM_RS_REQUEST] = "CsumRSRequest", - [P_RS_IS_IN_SYNC] = "CsumRSIsInSync", - [P_COMPRESSED_BITMAP] = "CBitmap", - [P_DELAY_PROBE] = "DelayProbe", - [P_MAX_CMD] = NULL, - }; - - if (cmd == P_HAND_SHAKE_M) - return "HandShakeM"; - if (cmd == P_HAND_SHAKE_S) - return "HandShakeS"; - if (cmd == P_HAND_SHAKE) - return "HandShake"; - if (cmd >= P_MAX_CMD) - return "Unknown"; - return cmdnames[cmd]; -} +extern const char *cmdname(enum drbd_packet cmd); /* for sending/receiving the bitmap, * possibly in some encoding scheme */ @@ -301,7 +225,7 @@ struct bm_xfer_ctx { unsigned bytes[2]; }; -extern void INFO_bm_xfer_stats(struct drbd_conf *mdev, +extern void INFO_bm_xfer_stats(struct drbd_device *device, const char *direction, struct bm_xfer_ctx *c); static inline void bm_xfer_ctx_bit_to_word_offset(struct bm_xfer_ctx *c) @@ -323,338 +247,14 @@ static inline void bm_xfer_ctx_bit_to_word_offset(struct bm_xfer_ctx *c) #endif } -#ifndef __packed -#define __packed __attribute__((packed)) -#endif - -/* This is the layout for a packet on the wire. - * The byteorder is the network byte order. - * (except block_id and barrier fields. - * these are pointers to local structs - * and have no relevance for the partner, - * which just echoes them as received.) - * - * NOTE that the payload starts at a long aligned offset, - * regardless of 32 or 64 bit arch! - */ -struct p_header80 { - u32 magic; - u16 command; - u16 length; /* bytes of data after this header */ - u8 payload[0]; -} __packed; - -/* Header for big packets, Used for data packets exceeding 64kB */ -struct p_header95 { - u16 magic; /* use DRBD_MAGIC_BIG here */ - u16 command; - u32 length; /* Use only 24 bits of that. Ignore the highest 8 bit. */ - u8 payload[0]; -} __packed; - -union p_header { - struct p_header80 h80; - struct p_header95 h95; -}; - -/* - * short commands, packets without payload, plain p_header: - * P_PING - * P_PING_ACK - * P_BECOME_SYNC_TARGET - * P_BECOME_SYNC_SOURCE - * P_UNPLUG_REMOTE - */ - -/* - * commands with out-of-struct payload: - * P_BITMAP (no additional fields) - * P_DATA, P_DATA_REPLY (see p_data) - * P_COMPRESSED_BITMAP (see receive_compressed_bitmap) - */ - -/* these defines must not be changed without changing the protocol version */ -#define DP_HARDBARRIER 1 /* depricated */ -#define DP_RW_SYNC 2 /* equals REQ_SYNC */ -#define DP_MAY_SET_IN_SYNC 4 -#define DP_UNPLUG 8 /* equals REQ_UNPLUG */ -#define DP_FUA 16 /* equals REQ_FUA */ -#define DP_FLUSH 32 /* equals REQ_FLUSH */ -#define DP_DISCARD 64 /* equals REQ_DISCARD */ - -struct p_data { - union p_header head; - u64 sector; /* 64 bits sector number */ - u64 block_id; /* to identify the request in protocol B&C */ - u32 seq_num; - u32 dp_flags; -} __packed; - -/* - * commands which share a struct: - * p_block_ack: - * P_RECV_ACK (proto B), P_WRITE_ACK (proto C), - * P_DISCARD_ACK (proto C, two-primaries conflict detection) - * p_block_req: - * P_DATA_REQUEST, P_RS_DATA_REQUEST - */ -struct p_block_ack { - struct p_header80 head; - u64 sector; - u64 block_id; - u32 blksize; - u32 seq_num; -} __packed; - - -struct p_block_req { - struct p_header80 head; - u64 sector; - u64 block_id; - u32 blksize; - u32 pad; /* to multiple of 8 Byte */ -} __packed; - -/* - * commands with their own struct for additional fields: - * P_HAND_SHAKE - * P_BARRIER - * P_BARRIER_ACK - * P_SYNC_PARAM - * ReportParams - */ - -struct p_handshake { - struct p_header80 head; /* 8 bytes */ - u32 protocol_min; - u32 feature_flags; - u32 protocol_max; - - /* should be more than enough for future enhancements - * for now, feature_flags and the reserverd array shall be zero. - */ - - u32 _pad; - u64 reserverd[7]; -} __packed; -/* 80 bytes, FIXED for the next century */ - -struct p_barrier { - struct p_header80 head; - u32 barrier; /* barrier number _handle_ only */ - u32 pad; /* to multiple of 8 Byte */ -} __packed; - -struct p_barrier_ack { - struct p_header80 head; - u32 barrier; - u32 set_size; -} __packed; - -struct p_rs_param { - struct p_header80 head; - u32 rate; - - /* Since protocol version 88 and higher. */ - char verify_alg[0]; -} __packed; - -struct p_rs_param_89 { - struct p_header80 head; - u32 rate; - /* protocol version 89: */ - char verify_alg[SHARED_SECRET_MAX]; - char csums_alg[SHARED_SECRET_MAX]; -} __packed; - -struct p_rs_param_95 { - struct p_header80 head; - u32 rate; - char verify_alg[SHARED_SECRET_MAX]; - char csums_alg[SHARED_SECRET_MAX]; - u32 c_plan_ahead; - u32 c_delay_target; - u32 c_fill_target; - u32 c_max_rate; -} __packed; - -enum drbd_conn_flags { - CF_WANT_LOSE = 1, - CF_DRY_RUN = 2, -}; - -struct p_protocol { - struct p_header80 head; - u32 protocol; - u32 after_sb_0p; - u32 after_sb_1p; - u32 after_sb_2p; - u32 conn_flags; - u32 two_primaries; - - /* Since protocol version 87 and higher. */ - char integrity_alg[0]; - -} __packed; - -struct p_uuids { - struct p_header80 head; - u64 uuid[UI_EXTENDED_SIZE]; -} __packed; - -struct p_rs_uuid { - struct p_header80 head; - u64 uuid; -} __packed; - -struct p_sizes { - struct p_header80 head; - u64 d_size; /* size of disk */ - u64 u_size; /* user requested size */ - u64 c_size; /* current exported size */ - u32 max_segment_size; /* Maximal size of a BIO */ - u16 queue_order_type; /* not yet implemented in DRBD*/ - u16 dds_flags; /* use enum dds_flags here. */ -} __packed; - -struct p_state { - struct p_header80 head; - u32 state; -} __packed; - -struct p_req_state { - struct p_header80 head; - u32 mask; - u32 val; -} __packed; - -struct p_req_state_reply { - struct p_header80 head; - u32 retcode; -} __packed; - -struct p_drbd06_param { - u64 size; - u32 state; - u32 blksize; - u32 protocol; - u32 version; - u32 gen_cnt[5]; - u32 bit_map_gen[5]; -} __packed; - -struct p_discard { - struct p_header80 head; - u64 block_id; - u32 seq_num; - u32 pad; -} __packed; - -/* Valid values for the encoding field. - * Bump proto version when changing this. */ -enum drbd_bitmap_code { - /* RLE_VLI_Bytes = 0, - * and other bit variants had been defined during - * algorithm evaluation. */ - RLE_VLI_Bits = 2, -}; - -struct p_compressed_bm { - struct p_header80 head; - /* (encoding & 0x0f): actual encoding, see enum drbd_bitmap_code - * (encoding & 0x80): polarity (set/unset) of first runlength - * ((encoding >> 4) & 0x07): pad_bits, number of trailing zero bits - * used to pad up to head.length bytes - */ - u8 encoding; - - u8 code[0]; -} __packed; - -struct p_delay_probe93 { - struct p_header80 head; - u32 seq_num; /* sequence number to match the two probe packets */ - u32 offset; /* usecs the probe got sent after the reference time point */ -} __packed; - -/* DCBP: Drbd Compressed Bitmap Packet ... */ -static inline enum drbd_bitmap_code -DCBP_get_code(struct p_compressed_bm *p) -{ - return (enum drbd_bitmap_code)(p->encoding & 0x0f); -} - -static inline void -DCBP_set_code(struct p_compressed_bm *p, enum drbd_bitmap_code code) -{ - BUG_ON(code & ~0xf); - p->encoding = (p->encoding & ~0xf) | code; -} - -static inline int -DCBP_get_start(struct p_compressed_bm *p) -{ - return (p->encoding & 0x80) != 0; -} - -static inline void -DCBP_set_start(struct p_compressed_bm *p, int set) -{ - p->encoding = (p->encoding & ~0x80) | (set ? 0x80 : 0); -} - -static inline int -DCBP_get_pad_bits(struct p_compressed_bm *p) -{ - return (p->encoding >> 4) & 0x7; -} - -static inline void -DCBP_set_pad_bits(struct p_compressed_bm *p, int n) -{ - BUG_ON(n & ~0x7); - p->encoding = (p->encoding & (~0x7 << 4)) | (n << 4); -} - -/* one bitmap packet, including the p_header, - * should fit within one _architecture independend_ page. - * so we need to use the fixed size 4KiB page size - * most architechtures have used for a long time. - */ -#define BM_PACKET_PAYLOAD_BYTES (4096 - sizeof(struct p_header80)) -#define BM_PACKET_WORDS (BM_PACKET_PAYLOAD_BYTES/sizeof(long)) -#define BM_PACKET_VLI_BYTES_MAX (4096 - sizeof(struct p_compressed_bm)) -#if (PAGE_SIZE < 4096) -/* drbd_send_bitmap / receive_bitmap would break horribly */ -#error "PAGE_SIZE too small" -#endif - -union p_polymorph { - union p_header header; - struct p_handshake handshake; - struct p_data data; - struct p_block_ack block_ack; - struct p_barrier barrier; - struct p_barrier_ack barrier_ack; - struct p_rs_param_89 rs_param_89; - struct p_rs_param_95 rs_param_95; - struct p_protocol protocol; - struct p_sizes sizes; - struct p_uuids uuids; - struct p_state state; - struct p_req_state req_state; - struct p_req_state_reply req_state_reply; - struct p_block_req block_req; - struct p_delay_probe93 delay_probe93; - struct p_rs_uuid rs_uuid; -} __packed; +extern unsigned int drbd_header_size(struct drbd_connection *connection); /**********************************************************************/ enum drbd_thread_state { - None, - Running, - Exiting, - Restarting + NONE, + RUNNING, + EXITING, + RESTARTING }; struct drbd_thread { @@ -663,8 +263,10 @@ struct drbd_thread { struct completion stop; enum drbd_thread_state t_state; int (*function) (struct drbd_thread *); - struct drbd_conf *mdev; + struct drbd_resource *resource; + struct drbd_connection *connection; int reset_cpu_mask; + const char *name; }; static inline enum drbd_thread_state get_t_state(struct drbd_thread *thi) @@ -677,69 +279,56 @@ static inline enum drbd_thread_state get_t_state(struct drbd_thread *thi) return thi->t_state; } - -/* - * Having this as the first member of a struct provides sort of "inheritance". - * "derived" structs can be "drbd_queue_work()"ed. - * The callback should know and cast back to the descendant struct. - * drbd_request and drbd_epoch_entry are descendants of drbd_work. - */ -struct drbd_work; -typedef int (*drbd_work_cb)(struct drbd_conf *, struct drbd_work *, int cancel); struct drbd_work { struct list_head list; - drbd_work_cb cb; + int (*cb)(struct drbd_work *, int cancel); +}; + +struct drbd_device_work { + struct drbd_work w; + struct drbd_device *device; }; -struct drbd_tl_epoch; +#include "drbd_interval.h" + +extern int drbd_wait_misc(struct drbd_device *, struct drbd_interval *); + struct drbd_request { struct drbd_work w; - struct drbd_conf *mdev; + struct drbd_device *device; /* if local IO is not allowed, will be NULL. * if local IO _is_ allowed, holds the locally submitted bio clone, * or, after local IO completion, the ERR_PTR(error). - * see drbd_endio_pri(). */ + * see drbd_request_endio(). */ struct bio *private_bio; - struct hlist_node colision; - sector_t sector; - unsigned int size; - unsigned int epoch; /* barrier_nr */ + struct drbd_interval i; - /* barrier_nr: used to check on "completion" whether this req was in + /* epoch: used to check on "completion" whether this req was in * the current epoch, and we therefore have to close it, - * starting a new epoch... + * causing a p_barrier packet to be send, starting a new epoch. + * + * This corresponds to "barrier" in struct p_barrier[_ack], + * and to "barrier_nr" in struct drbd_epoch (and various + * comments/function parameters/local variable names). */ - - /* up to here, the struct layout is identical to drbd_epoch_entry; - * we might be able to use that to our advantage... */ + unsigned int epoch; struct list_head tl_requests; /* ring list in the transfer log */ struct bio *master_bio; /* master bio pointer */ - unsigned long rq_state; /* see comments above _req_mod() */ - int seq_num; unsigned long start_time; -}; -struct drbd_tl_epoch { - struct drbd_work w; - struct list_head requests; /* requests before */ - struct drbd_tl_epoch *next; /* pointer to the next barrier */ - unsigned int br_number; /* the barriers identifier. */ - int n_writes; /* number of requests attached before this barrier */ -}; - -struct drbd_request; + /* once it hits 0, we may complete the master_bio */ + atomic_t completion_ref; + /* once it hits 0, we may destroy this drbd_request object */ + struct kref kref; -/* These Tl_epoch_entries may be in one of 6 lists: - active_ee .. data packet being written - sync_ee .. syncer block being written - done_ee .. block written, need to send P_WRITE_ACK - read_ee .. [RS]P_DATA_REQUEST being read -*/ + unsigned rq_state; /* see comments above _req_mod() */ +}; struct drbd_epoch { + struct drbd_connection *connection; struct list_head list; unsigned int barrier_nr; atomic_t epoch_size; /* increased on every request added. */ @@ -747,6 +336,10 @@ struct drbd_epoch { unsigned long flags; }; +/* Prototype declaration of function defined in drbd_receiver.c */ +int drbdd_init(struct drbd_thread *); +int drbd_asender(struct drbd_thread *); + /* drbd_epoch flag bits */ enum { DE_HAVE_BARRIER_NUMBER, @@ -759,27 +352,20 @@ enum epoch_event { EV_CLEANUP = 32, /* used as flag */ }; -struct drbd_wq_barrier { - struct drbd_work w; - struct completion done; -}; - struct digest_info { int digest_size; void *digest; }; -struct drbd_epoch_entry { +struct drbd_peer_request { struct drbd_work w; - struct hlist_node colision; + struct drbd_peer_device *peer_device; struct drbd_epoch *epoch; /* for writes */ - struct drbd_conf *mdev; struct page *pages; atomic_t pending_bios; - unsigned int size; + struct drbd_interval i; /* see comments on ee flag bits below */ unsigned long flags; - sector_t sector; union { u64 block_id; struct digest_info *digest; @@ -796,42 +382,54 @@ enum { __EE_CALL_AL_COMPLETE_IO, __EE_MAY_SET_IN_SYNC, + /* is this a TRIM aka REQ_DISCARD? */ + __EE_IS_TRIM, + /* our lower level cannot handle trim, + * and we want to fall back to zeroout instead */ + __EE_IS_TRIM_USE_ZEROOUT, + /* In case a barrier failed, * we need to resubmit without the barrier flag. */ __EE_RESUBMITTED, - /* we may have several bios per epoch entry. + /* we may have several bios per peer request. * if any of those fail, we set this flag atomically * from the endio callback */ __EE_WAS_ERROR, /* This ee has a pointer to a digest instead of a block id */ __EE_HAS_DIGEST, + + /* Conflicting local requests need to be restarted after this request */ + __EE_RESTART_REQUESTS, + + /* The peer wants a write ACK for this (wire proto C) */ + __EE_SEND_WRITE_ACK, + + /* Is set when net_conf had two_primaries set while creating this peer_req */ + __EE_IN_INTERVAL_TREE, }; #define EE_CALL_AL_COMPLETE_IO (1<<__EE_CALL_AL_COMPLETE_IO) #define EE_MAY_SET_IN_SYNC (1<<__EE_MAY_SET_IN_SYNC) -#define EE_RESUBMITTED (1<<__EE_RESUBMITTED) +#define EE_IS_TRIM (1<<__EE_IS_TRIM) +#define EE_IS_TRIM_USE_ZEROOUT (1<<__EE_IS_TRIM_USE_ZEROOUT) +#define EE_RESUBMITTED (1<<__EE_RESUBMITTED) #define EE_WAS_ERROR (1<<__EE_WAS_ERROR) #define EE_HAS_DIGEST (1<<__EE_HAS_DIGEST) +#define EE_RESTART_REQUESTS (1<<__EE_RESTART_REQUESTS) +#define EE_SEND_WRITE_ACK (1<<__EE_SEND_WRITE_ACK) +#define EE_IN_INTERVAL_TREE (1<<__EE_IN_INTERVAL_TREE) -/* global flag bits */ +/* flag bits per device */ enum { - CREATE_BARRIER, /* next P_DATA is preceeded by a P_BARRIER */ - SIGNAL_ASENDER, /* whether asender wants to be interrupted */ - SEND_PING, /* whether asender should send a ping asap */ - - UNPLUG_QUEUED, /* only relevant with kernel 2.4 */ UNPLUG_REMOTE, /* sending a "UnplugRemote" could help */ MD_DIRTY, /* current uuids and flags not yet on disk */ - DISCARD_CONCURRENT, /* Set on one node, cleared on the peer! */ USE_DEGR_WFC_T, /* degr-wfc-timeout instead of wfc-timeout. */ - CLUSTER_ST_CHANGE, /* Cluster wide state change going on... */ CL_ST_CHG_SUCCESS, CL_ST_CHG_FAIL, CRASHED_PRIMARY, /* This node was a crashed primary. * Gets cleared when the state.conn * goes into C_CONNECTED state. */ - WRITE_BM_AFTER_RESYNC, /* A kmalloc() during resync failed */ CONSIDER_RESYNC, MD_NO_FUA, /* Users wants us to not use FUA/FLUSH on meta data dev */ @@ -840,95 +438,109 @@ enum { once no more io in flight, start bitmap io */ BITMAP_IO_QUEUED, /* Started bitmap IO */ GO_DISKLESS, /* Disk is being detached, on io-error or admin request. */ - WAS_IO_ERROR, /* Local disk failed returned IO error */ + WAS_IO_ERROR, /* Local disk failed, returned IO error */ + WAS_READ_ERROR, /* Local disk READ failed (set additionally to the above) */ + FORCE_DETACH, /* Force-detach from local disk, aborting any pending local IO */ RESYNC_AFTER_NEG, /* Resync after online grow after the attach&negotiate finished. */ - NET_CONGESTED, /* The data socket is congested */ - - CONFIG_PENDING, /* serialization of (re)configuration requests. - * if set, also prevents the device from dying */ - DEVICE_DYING, /* device became unconfigured, - * but worker thread is still handling the cleanup. - * reconfiguring (nl_disk_conf, nl_net_conf) is dissalowed, - * while this is set. */ RESIZE_PENDING, /* Size change detected locally, waiting for the response from * the peer, if it changed there as well. */ - CONN_DRY_RUN, /* Expect disconnect after resync handshake. */ - GOT_PING_ACK, /* set when we receive a ping_ack packet, misc wait gets woken */ NEW_CUR_UUID, /* Create new current UUID when thawing IO */ AL_SUSPENDED, /* Activity logging is currently suspended. */ + AHEAD_TO_SYNC_SOURCE, /* Ahead -> SyncSource queued */ + B_RS_H_DONE, /* Before resync handler done (already executed) */ + DISCARD_MY_DATA, /* discard_my_data flag per volume */ + READ_BALANCE_RR, }; -struct drbd_bitmap; /* opaque for drbd_conf */ +struct drbd_bitmap; /* opaque for drbd_device */ -/* TODO sort members for performance - * MAYBE group them further */ +/* definition of bits in bm_flags to be used in drbd_bm_lock + * and drbd_bitmap_io and friends. */ +enum bm_flag { + /* do we need to kfree, or vfree bm_pages? */ + BM_P_VMALLOCED = 0x10000, /* internal use only, will be masked out */ + + /* currently locked for bulk operation */ + BM_LOCKED_MASK = 0xf, + + /* in detail, that is: */ + BM_DONT_CLEAR = 0x1, + BM_DONT_SET = 0x2, + BM_DONT_TEST = 0x4, + + /* so we can mark it locked for bulk operation, + * and still allow all non-bulk operations */ + BM_IS_LOCKED = 0x8, + + /* (test bit, count bit) allowed (common case) */ + BM_LOCKED_TEST_ALLOWED = BM_DONT_CLEAR | BM_DONT_SET | BM_IS_LOCKED, + + /* testing bits, as well as setting new bits allowed, but clearing bits + * would be unexpected. Used during bitmap receive. Setting new bits + * requires sending of "out-of-sync" information, though. */ + BM_LOCKED_SET_ALLOWED = BM_DONT_CLEAR | BM_IS_LOCKED, + + /* for drbd_bm_write_copy_pages, everything is allowed, + * only concurrent bulk operations are locked out. */ + BM_LOCKED_CHANGE_ALLOWED = BM_IS_LOCKED, +}; -/* THINK maybe we actually want to use the default "event/%s" worker threads - * or similar in linux 2.6, which uses per cpu data and threads. - */ struct drbd_work_queue { struct list_head q; - struct semaphore s; /* producers up it, worker down()s it */ spinlock_t q_lock; /* to protect the list. */ + wait_queue_head_t q_wait; }; struct drbd_socket { - struct drbd_work_queue work; struct mutex mutex; struct socket *socket; /* this way we get our * send/receive buffers off the stack */ - union p_polymorph sbuf; - union p_polymorph rbuf; + void *sbuf; + void *rbuf; }; struct drbd_md { u64 md_offset; /* sector offset to 'super' block */ u64 la_size_sect; /* last agreed size, unit sectors */ + spinlock_t uuid_lock; u64 uuid[UI_SIZE]; u64 device_uuid; u32 flags; u32 md_size_sect; - s32 al_offset; /* signed relative sector offset to al area */ + s32 al_offset; /* signed relative sector offset to activity log */ s32 bm_offset; /* signed relative sector offset to bitmap */ - /* u32 al_nr_extents; important for restoring the AL - * is stored into sync_conf.al_extents, which in turn - * gets applied to act_log->nr_elements - */ -}; + /* cached value of bdev->disk_conf->meta_dev_idx (see below) */ + s32 meta_dev_idx; -/* for sync_conf and other types... */ -#define NL_PACKET(name, number, fields) struct name { fields }; -#define NL_INTEGER(pn,pr,member) int member; -#define NL_INT64(pn,pr,member) __u64 member; -#define NL_BIT(pn,pr,member) unsigned member:1; -#define NL_STRING(pn,pr,member,len) unsigned char member[len]; int member ## _len; -#include "linux/drbd_nl.h" + /* see al_tr_number_to_on_disk_sector() */ + u32 al_stripes; + u32 al_stripe_size_4k; + u32 al_size_4k; /* cached product of the above */ +}; struct drbd_backing_dev { struct block_device *backing_bdev; struct block_device *md_bdev; - struct file *lo_file; - struct file *md_file; struct drbd_md md; - struct disk_conf dc; /* The user provided config... */ + struct disk_conf *disk_conf; /* RCU, for updates: resource->conf_update */ sector_t known_size; /* last known size of that backing device */ }; struct drbd_md_io { - struct drbd_conf *mdev; - struct completion event; + unsigned int done; int error; }; struct bm_io_work { struct drbd_work w; char *why; - int (*io_fn)(struct drbd_conf *mdev); - void (*done)(struct drbd_conf *mdev, int rv); + enum bm_flag flags; + int (*io_fn)(struct drbd_device *device); + void (*done)(struct drbd_device *device, int rv); }; enum write_ordering_e { @@ -938,18 +550,143 @@ enum write_ordering_e { }; struct fifo_buffer { - int *values; unsigned int head_index; unsigned int size; + int total; /* sum of all values */ + int values[0]; +}; +extern struct fifo_buffer *fifo_alloc(int fifo_size); + +/* flag bits per connection */ +enum { + NET_CONGESTED, /* The data socket is congested */ + RESOLVE_CONFLICTS, /* Set on one node, cleared on the peer! */ + SEND_PING, /* whether asender should send a ping asap */ + SIGNAL_ASENDER, /* whether asender wants to be interrupted */ + GOT_PING_ACK, /* set when we receive a ping_ack packet, ping_wait gets woken */ + CONN_WD_ST_CHG_REQ, /* A cluster wide state change on the connection is active */ + CONN_WD_ST_CHG_OKAY, + CONN_WD_ST_CHG_FAIL, + CONN_DRY_RUN, /* Expect disconnect after resync handshake. */ + CREATE_BARRIER, /* next P_DATA is preceded by a P_BARRIER */ + STATE_SENT, /* Do not change state/UUIDs while this is set */ + CALLBACK_PENDING, /* Whether we have a call_usermodehelper(, UMH_WAIT_PROC) + * pending, from drbd worker context. + * If set, bdi_write_congested() returns true, + * so shrink_page_list() would not recurse into, + * and potentially deadlock on, this drbd worker. + */ + DISCONNECT_SENT, +}; + +struct drbd_resource { + char *name; + struct kref kref; + struct idr devices; /* volume number to device mapping */ + struct list_head connections; + struct list_head resources; + struct res_opts res_opts; + struct mutex conf_update; /* mutex for ready-copy-update of net_conf and disk_conf */ + struct mutex adm_mutex; /* mutex to serialize administrative requests */ + spinlock_t req_lock; + + unsigned susp:1; /* IO suspended by user */ + unsigned susp_nod:1; /* IO suspended because no data */ + unsigned susp_fen:1; /* IO suspended because fence peer handler runs */ + + cpumask_var_t cpu_mask; +}; + +struct drbd_connection { + struct list_head connections; + struct drbd_resource *resource; + struct kref kref; + struct idr peer_devices; /* volume number to peer device mapping */ + enum drbd_conns cstate; /* Only C_STANDALONE to C_WF_REPORT_PARAMS */ + struct mutex cstate_mutex; /* Protects graceful disconnects */ + unsigned int connect_cnt; /* Inc each time a connection is established */ + + unsigned long flags; + struct net_conf *net_conf; /* content protected by rcu */ + wait_queue_head_t ping_wait; /* Woken upon reception of a ping, and a state change */ + + struct sockaddr_storage my_addr; + int my_addr_len; + struct sockaddr_storage peer_addr; + int peer_addr_len; + + struct drbd_socket data; /* data/barrier/cstate/parameter packets */ + struct drbd_socket meta; /* ping/ack (metadata) packets */ + int agreed_pro_version; /* actually used protocol version */ + u32 agreed_features; + unsigned long last_received; /* in jiffies, either socket */ + unsigned int ko_count; + + struct list_head transfer_log; /* all requests not yet fully processed */ + + struct crypto_hash *cram_hmac_tfm; + struct crypto_hash *integrity_tfm; /* checksums we compute, updates protected by connection->data->mutex */ + struct crypto_hash *peer_integrity_tfm; /* checksums we verify, only accessed from receiver thread */ + struct crypto_hash *csums_tfm; + struct crypto_hash *verify_tfm; + void *int_dig_in; + void *int_dig_vv; + + /* receiver side */ + struct drbd_epoch *current_epoch; + spinlock_t epoch_lock; + unsigned int epochs; + enum write_ordering_e write_ordering; + atomic_t current_tle_nr; /* transfer log epoch number */ + unsigned current_tle_writes; /* writes seen within this tl epoch */ + + unsigned long last_reconnect_jif; + struct drbd_thread receiver; + struct drbd_thread worker; + struct drbd_thread asender; + + /* sender side */ + struct drbd_work_queue sender_work; + + struct { + /* whether this sender thread + * has processed a single write yet. */ + bool seen_any_write_yet; + + /* Which barrier number to send with the next P_BARRIER */ + int current_epoch_nr; + + /* how many write requests have been sent + * with req->epoch == current_epoch_nr. + * If none, no P_BARRIER will be sent. */ + unsigned current_epoch_writes; + } send; +}; + +struct submit_worker { + struct workqueue_struct *wq; + struct work_struct worker; + + spinlock_t lock; + struct list_head writes; +}; + +struct drbd_peer_device { + struct list_head peer_devices; + struct drbd_device *device; + struct drbd_connection *connection; }; -struct drbd_conf { +struct drbd_device { + struct drbd_resource *resource; + struct list_head peer_devices; + int vnr; /* volume number within the connection */ + struct kref kref; + /* things that are stored as / read from meta data on disk */ unsigned long flags; /* configured by drbdsetup */ - struct net_conf *net_conf; /* protected by get_net_conf() and put_net_conf() */ - struct syncer_conf sync_conf; struct drbd_backing_dev *ldev __protected_by(local); sector_t p_size; /* partner's disk size */ @@ -957,17 +694,16 @@ struct drbd_conf { struct block_device *this_bdev; struct gendisk *vdisk; - struct drbd_socket data; /* data/barrier/cstate/parameter packets */ - struct drbd_socket meta; /* ping/ack (metadata) packets */ - int agreed_pro_version; /* actually used protocol version */ - unsigned long last_received; /* in jiffies, either socket */ - unsigned int ko_count; - struct drbd_work resync_work, - unplug_work, - go_diskless, - md_sync_work; + unsigned long last_reattach_jif; + struct drbd_work resync_work; + struct drbd_work unplug_work; + struct drbd_work go_diskless; + struct drbd_work md_sync_work; + struct drbd_work start_resync_work; struct timer_list resync_timer; struct timer_list md_sync_timer; + struct timer_list start_resync_timer; + struct timer_list request_timer; #ifdef DRBD_DEBUG_MD_SYNC struct { unsigned int line; @@ -978,10 +714,9 @@ struct drbd_conf { /* Used after attach while negotiating new disk state. */ union drbd_state new_state_tmp; - union drbd_state state; + union drbd_dev_state state; wait_queue_head_t misc_wait; wait_queue_head_t state_wait; /* upon each state change. */ - wait_queue_head_t net_cnt_wait; unsigned int send_cnt; unsigned int recv_cnt; unsigned int read_cnt; @@ -991,20 +726,16 @@ struct drbd_conf { atomic_t ap_bio_cnt; /* Requests we need to complete */ atomic_t ap_pending_cnt; /* AP data packets on the wire, ack expected */ atomic_t rs_pending_cnt; /* RS request/data packets on the wire */ - atomic_t unacked_cnt; /* Need to send replys for */ + atomic_t unacked_cnt; /* Need to send replies for */ atomic_t local_cnt; /* Waiting for local completion */ - atomic_t net_cnt; /* Users of net_conf */ - spinlock_t req_lock; - struct drbd_tl_epoch *unused_spare_tle; /* for pre-allocation */ - struct drbd_tl_epoch *newest_tle; - struct drbd_tl_epoch *oldest_tle; - struct list_head out_of_sequence_requests; - struct hlist_head *tl_hash; - unsigned int tl_hash_s; - - /* blocks to sync in this run [unit BM_BLOCK_SIZE] */ + + /* Interval tree of pending local requests */ + struct rb_root read_requests; + struct rb_root write_requests; + + /* blocks to resync in this run [unit BM_BLOCK_SIZE] */ unsigned long rs_total; - /* number of sync IOs that failed in this run */ + /* number of resync blocks that failed in this run */ unsigned long rs_failed; /* Syncer's start time [unit jiffies] */ unsigned long rs_start; @@ -1020,9 +751,11 @@ struct drbd_conf { unsigned long rs_mark_time[DRBD_SYNC_MARKS]; /* current index into rs_mark_{left,time} */ int rs_last_mark; + unsigned long rs_last_bcast; /* [unit jiffies] */ /* where does the admin want us to start? (sector) */ sector_t ov_start_sector; + sector_t ov_stop_sector; /* where are we now? (sector) */ sector_t ov_position; /* Start sector of out of sync range (to merge printk reporting). */ @@ -1030,12 +763,7 @@ struct drbd_conf { /* size of out-of-sync range in sectors. */ sector_t ov_last_oos_size; unsigned long ov_left; /* in bits */ - struct crypto_hash *csums_tfm; - struct crypto_hash *verify_tfm; - struct drbd_thread receiver; - struct drbd_thread worker; - struct drbd_thread asender; struct drbd_bitmap *bitmap; unsigned long bm_resync_fo; /* bit offset for drbd_bm_find_next */ @@ -1048,52 +776,36 @@ struct drbd_conf { int open_cnt; u64 *p_uuid; - struct drbd_epoch *current_epoch; - spinlock_t epoch_lock; - unsigned int epochs; - enum write_ordering_e write_ordering; + struct list_head active_ee; /* IO in progress (P_DATA gets written to disk) */ struct list_head sync_ee; /* IO in progress (P_RS_DATA_REPLY gets written to disk) */ - struct list_head done_ee; /* send ack */ - struct list_head read_ee; /* IO in progress (any read) */ + struct list_head done_ee; /* need to send P_WRITE_ACK */ + struct list_head read_ee; /* [RS]P_DATA_REQUEST being read */ struct list_head net_ee; /* zero-copy network send in progress */ - struct hlist_head *ee_hash; /* is proteced by req_lock! */ - unsigned int ee_hash_s; - - /* this one is protected by ee_lock, single thread */ - struct drbd_epoch_entry *last_write_w_barrier; int next_barrier_nr; - struct hlist_head *app_reads_hash; /* is proteced by req_lock */ struct list_head resync_reads; atomic_t pp_in_use; /* allocated from page pool */ atomic_t pp_in_use_by_net; /* sendpage()d, still referenced by tcp */ wait_queue_head_t ee_wait; struct page *md_io_page; /* one page buffer for md_io */ - struct page *md_io_tmpp; /* for logical_block_size != 512 */ - struct mutex md_io_mutex; /* protects the md_io_buffer */ + struct drbd_md_io md_io; + atomic_t md_io_in_use; /* protects the md_io, md_io_page and md_io_tmpp */ spinlock_t al_lock; wait_queue_head_t al_wait; struct lru_cache *act_log; /* activity log */ unsigned int al_tr_number; int al_tr_cycle; - int al_tr_pos; /* position of the next transaction in the journal */ - struct crypto_hash *cram_hmac_tfm; - struct crypto_hash *integrity_w_tfm; /* to be used by the worker thread */ - struct crypto_hash *integrity_r_tfm; /* to be used by the receiver thread */ - void *int_dig_out; - void *int_dig_in; - void *int_dig_vv; wait_queue_head_t seq_wait; atomic_t packet_seq; unsigned int peer_seq; spinlock_t peer_seq_lock; unsigned int minor; unsigned long comm_bm_set; /* communicated number of set bits. */ - cpumask_var_t cpu_mask; struct bm_io_work bm_io_work; u64 ed_uuid; /* UUID of the exposed data */ - struct mutex state_mutex; + struct mutex own_state_mutex; + struct mutex *state_mutex; /* either own_state_mutex or first_peer_device(device)->connection->cstate_mutex */ char congestion_reason; /* Why we where congested... */ atomic_t rs_sect_in; /* for incoming resync data rate, SyncTarget */ atomic_t rs_sect_ev; /* for submitted resync data rate, both */ @@ -1101,48 +813,79 @@ struct drbd_conf { int rs_last_events; /* counter of read or write "events" (unit sectors) * on the lower level device when we last looked. */ int c_sync_rate; /* current resync rate after syncer throttle magic */ - struct fifo_buffer rs_plan_s; /* correction values of resync planer */ + struct fifo_buffer *rs_plan_s; /* correction values of resync planer (RCU, connection->conn_update) */ int rs_in_flight; /* resync sectors in flight (to proxy, in proxy and from proxy) */ - int rs_planed; /* resync sectors already planed */ -}; - -static inline struct drbd_conf *minor_to_mdev(unsigned int minor) -{ - struct drbd_conf *mdev; + atomic_t ap_in_flight; /* App sectors in flight (waiting for ack) */ + unsigned int peer_max_bio_size; + unsigned int local_max_bio_size; - mdev = minor < minor_count ? minor_table[minor] : NULL; + /* any requests that would block in drbd_make_request() + * are deferred to this single-threaded work queue */ + struct submit_worker submit; +}; - return mdev; -} +struct drbd_config_context { + /* assigned from drbd_genlmsghdr */ + unsigned int minor; + /* assigned from request attributes, if present */ + unsigned int volume; +#define VOLUME_UNSPECIFIED (-1U) + /* pointer into the request skb, + * limited lifetime! */ + char *resource_name; + struct nlattr *my_addr; + struct nlattr *peer_addr; + + /* reply buffer */ + struct sk_buff *reply_skb; + /* pointer into reply buffer */ + struct drbd_genlmsghdr *reply_dh; + /* resolved from attributes, if possible */ + struct drbd_device *device; + struct drbd_resource *resource; + struct drbd_connection *connection; +}; -static inline unsigned int mdev_to_minor(struct drbd_conf *mdev) +static inline struct drbd_device *minor_to_device(unsigned int minor) { - return mdev->minor; + return (struct drbd_device *)idr_find(&drbd_devices, minor); } -/* returns 1 if it was successfull, - * returns 0 if there was no data socket. - * so wherever you are going to use the data.socket, e.g. do - * if (!drbd_get_data_sock(mdev)) - * return 0; - * CODE(); - * drbd_put_data_sock(mdev); - */ -static inline int drbd_get_data_sock(struct drbd_conf *mdev) +static inline struct drbd_peer_device *first_peer_device(struct drbd_device *device) { - mutex_lock(&mdev->data.mutex); - /* drbd_disconnect() could have called drbd_free_sock() - * while we were waiting in down()... */ - if (unlikely(mdev->data.socket == NULL)) { - mutex_unlock(&mdev->data.mutex); - return 0; - } - return 1; + return list_first_entry_or_null(&device->peer_devices, struct drbd_peer_device, peer_devices); } -static inline void drbd_put_data_sock(struct drbd_conf *mdev) +#define for_each_resource(resource, _resources) \ + list_for_each_entry(resource, _resources, resources) + +#define for_each_resource_rcu(resource, _resources) \ + list_for_each_entry_rcu(resource, _resources, resources) + +#define for_each_resource_safe(resource, tmp, _resources) \ + list_for_each_entry_safe(resource, tmp, _resources, resources) + +#define for_each_connection(connection, resource) \ + list_for_each_entry(connection, &resource->connections, connections) + +#define for_each_connection_rcu(connection, resource) \ + list_for_each_entry_rcu(connection, &resource->connections, connections) + +#define for_each_connection_safe(connection, tmp, resource) \ + list_for_each_entry_safe(connection, tmp, &resource->connections, connections) + +#define for_each_peer_device(peer_device, device) \ + list_for_each_entry(peer_device, &device->peer_devices, peer_devices) + +#define for_each_peer_device_rcu(peer_device, device) \ + list_for_each_entry_rcu(peer_device, &device->peer_devices, peer_devices) + +#define for_each_peer_device_safe(peer_device, tmp, device) \ + list_for_each_entry_safe(peer_device, tmp, &device->peer_devices, peer_devices) + +static inline unsigned int device_to_minor(struct drbd_device *device) { - mutex_unlock(&mdev->data.mutex); + return device->minor; } /* @@ -1151,147 +894,157 @@ static inline void drbd_put_data_sock(struct drbd_conf *mdev) /* drbd_main.c */ -enum chg_state_flags { - CS_HARD = 1, - CS_VERBOSE = 2, - CS_WAIT_COMPLETE = 4, - CS_SERIALIZE = 8, - CS_ORDERED = CS_WAIT_COMPLETE + CS_SERIALIZE, -}; - enum dds_flags { DDSF_FORCED = 1, DDSF_NO_RESYNC = 2, /* Do not run a resync for the new space */ }; -extern void drbd_init_set_defaults(struct drbd_conf *mdev); -extern int drbd_change_state(struct drbd_conf *mdev, enum chg_state_flags f, - union drbd_state mask, union drbd_state val); -extern void drbd_force_state(struct drbd_conf *, union drbd_state, - union drbd_state); -extern int _drbd_request_state(struct drbd_conf *, union drbd_state, - union drbd_state, enum chg_state_flags); -extern int __drbd_set_state(struct drbd_conf *, union drbd_state, - enum chg_state_flags, struct completion *done); -extern void print_st_err(struct drbd_conf *, union drbd_state, - union drbd_state, int); +extern void drbd_init_set_defaults(struct drbd_device *device); extern int drbd_thread_start(struct drbd_thread *thi); extern void _drbd_thread_stop(struct drbd_thread *thi, int restart, int wait); #ifdef CONFIG_SMP -extern void drbd_thread_current_set_cpu(struct drbd_conf *mdev); -extern void drbd_calc_cpu_mask(struct drbd_conf *mdev); +extern void drbd_thread_current_set_cpu(struct drbd_thread *thi); #else #define drbd_thread_current_set_cpu(A) ({}) -#define drbd_calc_cpu_mask(A) ({}) #endif -extern void drbd_free_resources(struct drbd_conf *mdev); -extern void tl_release(struct drbd_conf *mdev, unsigned int barrier_nr, +extern void tl_release(struct drbd_connection *, unsigned int barrier_nr, unsigned int set_size); -extern void tl_clear(struct drbd_conf *mdev); -enum drbd_req_event; -extern void tl_restart(struct drbd_conf *mdev, enum drbd_req_event what); -extern void _tl_add_barrier(struct drbd_conf *, struct drbd_tl_epoch *); -extern void drbd_free_sock(struct drbd_conf *mdev); -extern int drbd_send(struct drbd_conf *mdev, struct socket *sock, - void *buf, size_t size, unsigned msg_flags); -extern int drbd_send_protocol(struct drbd_conf *mdev); -extern int drbd_send_uuids(struct drbd_conf *mdev); -extern int drbd_send_uuids_skip_initial_sync(struct drbd_conf *mdev); -extern int drbd_send_sync_uuid(struct drbd_conf *mdev, u64 val); -extern int drbd_send_sizes(struct drbd_conf *mdev, int trigger_reply, enum dds_flags flags); -extern int _drbd_send_state(struct drbd_conf *mdev); -extern int drbd_send_state(struct drbd_conf *mdev); -extern int _drbd_send_cmd(struct drbd_conf *mdev, struct socket *sock, - enum drbd_packets cmd, struct p_header80 *h, - size_t size, unsigned msg_flags); -#define USE_DATA_SOCKET 1 -#define USE_META_SOCKET 0 -extern int drbd_send_cmd(struct drbd_conf *mdev, int use_data_socket, - enum drbd_packets cmd, struct p_header80 *h, - size_t size); -extern int drbd_send_cmd2(struct drbd_conf *mdev, enum drbd_packets cmd, - char *data, size_t size); -extern int drbd_send_sync_param(struct drbd_conf *mdev, struct syncer_conf *sc); -extern int drbd_send_b_ack(struct drbd_conf *mdev, u32 barrier_nr, - u32 set_size); -extern int drbd_send_ack(struct drbd_conf *mdev, enum drbd_packets cmd, - struct drbd_epoch_entry *e); -extern int drbd_send_ack_rp(struct drbd_conf *mdev, enum drbd_packets cmd, - struct p_block_req *rp); -extern int drbd_send_ack_dp(struct drbd_conf *mdev, enum drbd_packets cmd, - struct p_data *dp, int data_size); -extern int drbd_send_ack_ex(struct drbd_conf *mdev, enum drbd_packets cmd, +extern void tl_clear(struct drbd_connection *); +extern void drbd_free_sock(struct drbd_connection *connection); +extern int drbd_send(struct drbd_connection *connection, struct socket *sock, + void *buf, size_t size, unsigned msg_flags); +extern int drbd_send_all(struct drbd_connection *, struct socket *, void *, size_t, + unsigned); + +extern int __drbd_send_protocol(struct drbd_connection *connection, enum drbd_packet cmd); +extern int drbd_send_protocol(struct drbd_connection *connection); +extern int drbd_send_uuids(struct drbd_peer_device *); +extern int drbd_send_uuids_skip_initial_sync(struct drbd_peer_device *); +extern void drbd_gen_and_send_sync_uuid(struct drbd_peer_device *); +extern int drbd_send_sizes(struct drbd_peer_device *, int trigger_reply, enum dds_flags flags); +extern int drbd_send_state(struct drbd_peer_device *, union drbd_state s); +extern int drbd_send_current_state(struct drbd_peer_device *); +extern int drbd_send_sync_param(struct drbd_peer_device *); +extern void drbd_send_b_ack(struct drbd_connection *connection, u32 barrier_nr, + u32 set_size); +extern int drbd_send_ack(struct drbd_peer_device *, enum drbd_packet, + struct drbd_peer_request *); +extern void drbd_send_ack_rp(struct drbd_peer_device *, enum drbd_packet, + struct p_block_req *rp); +extern void drbd_send_ack_dp(struct drbd_peer_device *, enum drbd_packet, + struct p_data *dp, int data_size); +extern int drbd_send_ack_ex(struct drbd_peer_device *, enum drbd_packet, sector_t sector, int blksize, u64 block_id); -extern int drbd_send_block(struct drbd_conf *mdev, enum drbd_packets cmd, - struct drbd_epoch_entry *e); -extern int drbd_send_dblock(struct drbd_conf *mdev, struct drbd_request *req); -extern int _drbd_send_barrier(struct drbd_conf *mdev, - struct drbd_tl_epoch *barrier); -extern int drbd_send_drequest(struct drbd_conf *mdev, int cmd, +extern int drbd_send_out_of_sync(struct drbd_peer_device *, struct drbd_request *); +extern int drbd_send_block(struct drbd_peer_device *, enum drbd_packet, + struct drbd_peer_request *); +extern int drbd_send_dblock(struct drbd_peer_device *, struct drbd_request *req); +extern int drbd_send_drequest(struct drbd_peer_device *, int cmd, sector_t sector, int size, u64 block_id); -extern int drbd_send_drequest_csum(struct drbd_conf *mdev, - sector_t sector,int size, - void *digest, int digest_size, - enum drbd_packets cmd); -extern int drbd_send_ov_request(struct drbd_conf *mdev,sector_t sector,int size); - -extern int drbd_send_bitmap(struct drbd_conf *mdev); -extern int _drbd_send_bitmap(struct drbd_conf *mdev); -extern int drbd_send_sr_reply(struct drbd_conf *mdev, int retcode); +extern int drbd_send_drequest_csum(struct drbd_peer_device *, sector_t sector, + int size, void *digest, int digest_size, + enum drbd_packet cmd); +extern int drbd_send_ov_request(struct drbd_peer_device *, sector_t sector, int size); + +extern int drbd_send_bitmap(struct drbd_device *device); +extern void drbd_send_sr_reply(struct drbd_peer_device *, enum drbd_state_rv retcode); +extern void conn_send_sr_reply(struct drbd_connection *connection, enum drbd_state_rv retcode); extern void drbd_free_bc(struct drbd_backing_dev *ldev); -extern void drbd_mdev_cleanup(struct drbd_conf *mdev); - -/* drbd_meta-data.c (still in drbd_main.c) */ -extern void drbd_md_sync(struct drbd_conf *mdev); -extern int drbd_md_read(struct drbd_conf *mdev, struct drbd_backing_dev *bdev); -/* maybe define them below as inline? */ -extern void drbd_uuid_set(struct drbd_conf *mdev, int idx, u64 val) __must_hold(local); -extern void _drbd_uuid_set(struct drbd_conf *mdev, int idx, u64 val) __must_hold(local); -extern void drbd_uuid_new_current(struct drbd_conf *mdev) __must_hold(local); -extern void _drbd_uuid_new_current(struct drbd_conf *mdev) __must_hold(local); -extern void drbd_uuid_set_bm(struct drbd_conf *mdev, u64 val) __must_hold(local); -extern void drbd_md_set_flag(struct drbd_conf *mdev, int flags) __must_hold(local); -extern void drbd_md_clear_flag(struct drbd_conf *mdev, int flags)__must_hold(local); +extern void drbd_device_cleanup(struct drbd_device *device); +void drbd_print_uuids(struct drbd_device *device, const char *text); + +extern void conn_md_sync(struct drbd_connection *connection); +extern void drbd_md_write(struct drbd_device *device, void *buffer); +extern void drbd_md_sync(struct drbd_device *device); +extern int drbd_md_read(struct drbd_device *device, struct drbd_backing_dev *bdev); +extern void drbd_uuid_set(struct drbd_device *device, int idx, u64 val) __must_hold(local); +extern void _drbd_uuid_set(struct drbd_device *device, int idx, u64 val) __must_hold(local); +extern void drbd_uuid_new_current(struct drbd_device *device) __must_hold(local); +extern void drbd_uuid_set_bm(struct drbd_device *device, u64 val) __must_hold(local); +extern void drbd_uuid_move_history(struct drbd_device *device) __must_hold(local); +extern void __drbd_uuid_set(struct drbd_device *device, int idx, u64 val) __must_hold(local); +extern void drbd_md_set_flag(struct drbd_device *device, int flags) __must_hold(local); +extern void drbd_md_clear_flag(struct drbd_device *device, int flags)__must_hold(local); extern int drbd_md_test_flag(struct drbd_backing_dev *, int); #ifndef DRBD_DEBUG_MD_SYNC -extern void drbd_md_mark_dirty(struct drbd_conf *mdev); +extern void drbd_md_mark_dirty(struct drbd_device *device); #else #define drbd_md_mark_dirty(m) drbd_md_mark_dirty_(m, __LINE__ , __func__ ) -extern void drbd_md_mark_dirty_(struct drbd_conf *mdev, +extern void drbd_md_mark_dirty_(struct drbd_device *device, unsigned int line, const char *func); #endif -extern void drbd_queue_bitmap_io(struct drbd_conf *mdev, - int (*io_fn)(struct drbd_conf *), - void (*done)(struct drbd_conf *, int), - char *why); -extern int drbd_bmio_set_n_write(struct drbd_conf *mdev); -extern int drbd_bmio_clear_n_write(struct drbd_conf *mdev); -extern int drbd_bitmap_io(struct drbd_conf *mdev, int (*io_fn)(struct drbd_conf *), char *why); -extern void drbd_go_diskless(struct drbd_conf *mdev); -extern void drbd_ldev_destroy(struct drbd_conf *mdev); - +extern void drbd_queue_bitmap_io(struct drbd_device *device, + int (*io_fn)(struct drbd_device *), + void (*done)(struct drbd_device *, int), + char *why, enum bm_flag flags); +extern int drbd_bitmap_io(struct drbd_device *device, + int (*io_fn)(struct drbd_device *), + char *why, enum bm_flag flags); +extern int drbd_bitmap_io_from_worker(struct drbd_device *device, + int (*io_fn)(struct drbd_device *), + char *why, enum bm_flag flags); +extern int drbd_bmio_set_n_write(struct drbd_device *device); +extern int drbd_bmio_clear_n_write(struct drbd_device *device); +extern void drbd_ldev_destroy(struct drbd_device *device); /* Meta data layout - We reserve a 128MB Block (4k aligned) - * either at the end of the backing device - * or on a separate meta data device. */ - -#define MD_RESERVED_SECT (128LU << 11) /* 128 MB, unit sectors */ -/* The following numbers are sectors */ -#define MD_AL_OFFSET 8 /* 8 Sectors after start of meta area */ -#define MD_AL_MAX_SIZE 64 /* = 32 kb LOG ~ 3776 extents ~ 14 GB Storage */ -/* Allows up to about 3.8TB */ -#define MD_BM_OFFSET (MD_AL_OFFSET + MD_AL_MAX_SIZE) - -/* Since the smalles IO unit is usually 512 byte */ -#define MD_SECTOR_SHIFT 9 -#define MD_SECTOR_SIZE (1<<MD_SECTOR_SHIFT) - -/* activity log */ -#define AL_EXTENTS_PT ((MD_SECTOR_SIZE-12)/8-1) /* 61 ; Extents per 512B sector */ -#define AL_EXTENT_SHIFT 22 /* One extent represents 4M Storage */ + * + * We currently have two possible layouts. + * Offsets in (512 byte) sectors. + * external: + * |----------- md_size_sect ------------------| + * [ 4k superblock ][ activity log ][ Bitmap ] + * | al_offset == 8 | + * | bm_offset = al_offset + X | + * ==> bitmap sectors = md_size_sect - bm_offset + * + * Variants: + * old, indexed fixed size meta data: + * + * internal: + * |----------- md_size_sect ------------------| + * [data.....][ Bitmap ][ activity log ][ 4k superblock ][padding*] + * | al_offset < 0 | + * | bm_offset = al_offset - Y | + * ==> bitmap sectors = Y = al_offset - bm_offset + * + * [padding*] are zero or up to 7 unused 512 Byte sectors to the + * end of the device, so that the [4k superblock] will be 4k aligned. + * + * The activity log consists of 4k transaction blocks, + * which are written in a ring-buffer, or striped ring-buffer like fashion, + * which are writtensize used to be fixed 32kB, + * but is about to become configurable. + */ + +/* Our old fixed size meta data layout + * allows up to about 3.8TB, so if you want more, + * you need to use the "flexible" meta data format. */ +#define MD_128MB_SECT (128LLU << 11) /* 128 MB, unit sectors */ +#define MD_4kB_SECT 8 +#define MD_32kB_SECT 64 + +/* One activity log extent represents 4M of storage */ +#define AL_EXTENT_SHIFT 22 #define AL_EXTENT_SIZE (1<<AL_EXTENT_SHIFT) +/* We could make these currently hardcoded constants configurable + * variables at create-md time (or even re-configurable at runtime?). + * Which will require some more changes to the DRBD "super block" + * and attach code. + * + * updates per transaction: + * This many changes to the active set can be logged with one transaction. + * This number is arbitrary. + * context per transaction: + * This many context extent numbers are logged with each transaction. + * This number is resulting from the transaction block size (4k), the layout + * of the transaction header, and the number of updates per transaction. + * See drbd_actlog.c:struct al_transaction_on_disk + * */ +#define AL_UPDATES_PER_TRANSACTION 64 // arbitrary +#define AL_CONTEXT_PER_TRANSACTION 919 // (4096 - 36 - 6*64)/4 + #if BITS_PER_LONG == 32 #define LN2_BPL 5 #define cpu_to_lel(A) cpu_to_le32(A) @@ -1315,6 +1068,7 @@ struct bm_extent { #define BME_NO_WRITES 0 /* bm_extent.flags: no more requests on this one! */ #define BME_LOCKED 1 /* bm_extent.flags: syncer active on this one. */ +#define BME_PRIORITY 2 /* finish resync IO on this extent ASAP! App IO waiting! */ /* drbd_bitmap.c */ /* @@ -1326,11 +1080,14 @@ struct bm_extent { #define SLEEP_TIME (HZ/10) -#define BM_BLOCK_SHIFT 12 /* 4k per bit */ +/* We do bitmap IO in units of 4k blocks. + * We also still have a hardcoded 4k per bit relation. */ +#define BM_BLOCK_SHIFT 12 /* 4k per bit */ #define BM_BLOCK_SIZE (1<<BM_BLOCK_SHIFT) -/* (9+3) : 512 bytes @ 8 bits; representing 16M storage - * per sector of on disk bitmap */ -#define BM_EXT_SHIFT (BM_BLOCK_SHIFT + MD_SECTOR_SHIFT + 3) /* = 24 */ +/* mostly arbitrarily set the represented size of one bitmap extent, + * aka resync extent, to 16 MiB (which is also 512 Byte worth of bitmap + * at 4k per bit resolution) */ +#define BM_EXT_SHIFT 24 /* 16 MiB per resync extent */ #define BM_EXT_SIZE (1<<BM_EXT_SHIFT) #if (BM_EXT_SHIFT != 24) || (BM_BLOCK_SHIFT != 12) @@ -1355,7 +1112,6 @@ struct bm_extent { /* in one sector of the bitmap, we have this many activity_log extents. */ #define AL_EXT_PER_BM_SECT (1 << (BM_EXT_SHIFT - AL_EXTENT_SHIFT)) -#define BM_WORDS_PER_AL_EXT (1 << (AL_EXTENT_SHIFT-BM_BLOCK_SHIFT-LN2_BPL)) #define BM_BLOCKS_PER_BM_EXT_B (BM_EXT_SHIFT - BM_BLOCK_SHIFT) #define BM_BLOCKS_PER_BM_EXT_MASK ((1<<BM_BLOCKS_PER_BM_EXT_B) - 1) @@ -1375,16 +1131,18 @@ struct bm_extent { */ #define DRBD_MAX_SECTORS_32 (0xffffffffLU) -#define DRBD_MAX_SECTORS_BM \ - ((MD_RESERVED_SECT - MD_BM_OFFSET) * (1LL<<(BM_EXT_SHIFT-9))) -#if DRBD_MAX_SECTORS_BM < DRBD_MAX_SECTORS_32 -#define DRBD_MAX_SECTORS DRBD_MAX_SECTORS_BM -#define DRBD_MAX_SECTORS_FLEX DRBD_MAX_SECTORS_BM -#elif !defined(CONFIG_LBDAF) && BITS_PER_LONG == 32 +/* we have a certain meta data variant that has a fixed on-disk size of 128 + * MiB, of which 4k are our "superblock", and 32k are the fixed size activity + * log, leaving this many sectors for the bitmap. + */ + +#define DRBD_MAX_SECTORS_FIXED_BM \ + ((MD_128MB_SECT - MD_32kB_SECT - MD_4kB_SECT) * (1LL<<(BM_EXT_SHIFT-9))) +#if !defined(CONFIG_LBDAF) && BITS_PER_LONG == 32 #define DRBD_MAX_SECTORS DRBD_MAX_SECTORS_32 #define DRBD_MAX_SECTORS_FLEX DRBD_MAX_SECTORS_32 #else -#define DRBD_MAX_SECTORS DRBD_MAX_SECTORS_BM +#define DRBD_MAX_SECTORS DRBD_MAX_SECTORS_FIXED_BM /* 16 TB in units of sectors */ #if BITS_PER_LONG == 32 /* adjust by one page worth of bitmap, @@ -1392,217 +1150,335 @@ struct bm_extent { * you should use 64bit OS for that much storage, anyways. */ #define DRBD_MAX_SECTORS_FLEX BM_BIT_TO_SECT(0xffff7fff) #else -#define DRBD_MAX_SECTORS_FLEX BM_BIT_TO_SECT(0x1LU << 32) +/* we allow up to 1 PiB now on 64bit architecture with "flexible" meta data */ +#define DRBD_MAX_SECTORS_FLEX (1UL << 51) +/* corresponds to (1UL << 38) bits right now. */ #endif #endif -/* Sector shift value for the "hash" functions of tl_hash and ee_hash tables. - * With a value of 8 all IO in one 128K block make it to the same slot of the - * hash table. */ -#define HT_SHIFT 8 -#define DRBD_MAX_SEGMENT_SIZE (1U<<(9+HT_SHIFT)) - -#define DRBD_MAX_SIZE_H80_PACKET (1 << 15) /* The old header only allows packets up to 32Kib data */ - -/* Number of elements in the app_reads_hash */ -#define APP_R_HSIZE 15 - -extern int drbd_bm_init(struct drbd_conf *mdev); -extern int drbd_bm_resize(struct drbd_conf *mdev, sector_t sectors, int set_new_bits); -extern void drbd_bm_cleanup(struct drbd_conf *mdev); -extern void drbd_bm_set_all(struct drbd_conf *mdev); -extern void drbd_bm_clear_all(struct drbd_conf *mdev); +/* BIO_MAX_SIZE is 256 * PAGE_CACHE_SIZE, + * so for typical PAGE_CACHE_SIZE of 4k, that is (1<<20) Byte. + * Since we may live in a mixed-platform cluster, + * we limit us to a platform agnostic constant here for now. + * A followup commit may allow even bigger BIO sizes, + * once we thought that through. */ +#define DRBD_MAX_BIO_SIZE (1U << 20) +#if DRBD_MAX_BIO_SIZE > BIO_MAX_SIZE +#error Architecture not supported: DRBD_MAX_BIO_SIZE > BIO_MAX_SIZE +#endif +#define DRBD_MAX_BIO_SIZE_SAFE (1U << 12) /* Works always = 4k */ + +#define DRBD_MAX_SIZE_H80_PACKET (1U << 15) /* Header 80 only allows packets up to 32KiB data */ +#define DRBD_MAX_BIO_SIZE_P95 (1U << 17) /* Protocol 95 to 99 allows bios up to 128KiB */ + +/* For now, don't allow more than one activity log extent worth of data + * to be discarded in one go. We may need to rework drbd_al_begin_io() + * to allow for even larger discard ranges */ +#define DRBD_MAX_DISCARD_SIZE AL_EXTENT_SIZE +#define DRBD_MAX_DISCARD_SECTORS (DRBD_MAX_DISCARD_SIZE >> 9) + +extern int drbd_bm_init(struct drbd_device *device); +extern int drbd_bm_resize(struct drbd_device *device, sector_t sectors, int set_new_bits); +extern void drbd_bm_cleanup(struct drbd_device *device); +extern void drbd_bm_set_all(struct drbd_device *device); +extern void drbd_bm_clear_all(struct drbd_device *device); +/* set/clear/test only a few bits at a time */ extern int drbd_bm_set_bits( - struct drbd_conf *mdev, unsigned long s, unsigned long e); + struct drbd_device *device, unsigned long s, unsigned long e); extern int drbd_bm_clear_bits( - struct drbd_conf *mdev, unsigned long s, unsigned long e); -/* bm_set_bits variant for use while holding drbd_bm_lock */ -extern void _drbd_bm_set_bits(struct drbd_conf *mdev, + struct drbd_device *device, unsigned long s, unsigned long e); +extern int drbd_bm_count_bits( + struct drbd_device *device, const unsigned long s, const unsigned long e); +/* bm_set_bits variant for use while holding drbd_bm_lock, + * may process the whole bitmap in one go */ +extern void _drbd_bm_set_bits(struct drbd_device *device, const unsigned long s, const unsigned long e); -extern int drbd_bm_test_bit(struct drbd_conf *mdev, unsigned long bitnr); -extern int drbd_bm_e_weight(struct drbd_conf *mdev, unsigned long enr); -extern int drbd_bm_write_sect(struct drbd_conf *mdev, unsigned long enr) __must_hold(local); -extern int drbd_bm_read(struct drbd_conf *mdev) __must_hold(local); -extern int drbd_bm_write(struct drbd_conf *mdev) __must_hold(local); -extern unsigned long drbd_bm_ALe_set_all(struct drbd_conf *mdev, - unsigned long al_enr); -extern size_t drbd_bm_words(struct drbd_conf *mdev); -extern unsigned long drbd_bm_bits(struct drbd_conf *mdev); -extern sector_t drbd_bm_capacity(struct drbd_conf *mdev); -extern unsigned long drbd_bm_find_next(struct drbd_conf *mdev, unsigned long bm_fo); +extern int drbd_bm_test_bit(struct drbd_device *device, unsigned long bitnr); +extern int drbd_bm_e_weight(struct drbd_device *device, unsigned long enr); +extern int drbd_bm_write_page(struct drbd_device *device, unsigned int idx) __must_hold(local); +extern int drbd_bm_read(struct drbd_device *device) __must_hold(local); +extern void drbd_bm_mark_for_writeout(struct drbd_device *device, int page_nr); +extern int drbd_bm_write(struct drbd_device *device) __must_hold(local); +extern int drbd_bm_write_hinted(struct drbd_device *device) __must_hold(local); +extern int drbd_bm_write_all(struct drbd_device *device) __must_hold(local); +extern int drbd_bm_write_copy_pages(struct drbd_device *device) __must_hold(local); +extern size_t drbd_bm_words(struct drbd_device *device); +extern unsigned long drbd_bm_bits(struct drbd_device *device); +extern sector_t drbd_bm_capacity(struct drbd_device *device); + +#define DRBD_END_OF_BITMAP (~(unsigned long)0) +extern unsigned long drbd_bm_find_next(struct drbd_device *device, unsigned long bm_fo); /* bm_find_next variants for use while you hold drbd_bm_lock() */ -extern unsigned long _drbd_bm_find_next(struct drbd_conf *mdev, unsigned long bm_fo); -extern unsigned long _drbd_bm_find_next_zero(struct drbd_conf *mdev, unsigned long bm_fo); -extern unsigned long _drbd_bm_total_weight(struct drbd_conf *mdev); -extern unsigned long drbd_bm_total_weight(struct drbd_conf *mdev); -extern int drbd_bm_rs_done(struct drbd_conf *mdev); +extern unsigned long _drbd_bm_find_next(struct drbd_device *device, unsigned long bm_fo); +extern unsigned long _drbd_bm_find_next_zero(struct drbd_device *device, unsigned long bm_fo); +extern unsigned long _drbd_bm_total_weight(struct drbd_device *device); +extern unsigned long drbd_bm_total_weight(struct drbd_device *device); +extern int drbd_bm_rs_done(struct drbd_device *device); /* for receive_bitmap */ -extern void drbd_bm_merge_lel(struct drbd_conf *mdev, size_t offset, +extern void drbd_bm_merge_lel(struct drbd_device *device, size_t offset, size_t number, unsigned long *buffer); -/* for _drbd_send_bitmap and drbd_bm_write_sect */ -extern void drbd_bm_get_lel(struct drbd_conf *mdev, size_t offset, +/* for _drbd_send_bitmap */ +extern void drbd_bm_get_lel(struct drbd_device *device, size_t offset, size_t number, unsigned long *buffer); -extern void drbd_bm_lock(struct drbd_conf *mdev, char *why); -extern void drbd_bm_unlock(struct drbd_conf *mdev); - -extern int drbd_bm_count_bits(struct drbd_conf *mdev, const unsigned long s, const unsigned long e); +extern void drbd_bm_lock(struct drbd_device *device, char *why, enum bm_flag flags); +extern void drbd_bm_unlock(struct drbd_device *device); /* drbd_main.c */ extern struct kmem_cache *drbd_request_cache; -extern struct kmem_cache *drbd_ee_cache; /* epoch entries */ +extern struct kmem_cache *drbd_ee_cache; /* peer requests */ extern struct kmem_cache *drbd_bm_ext_cache; /* bitmap extents */ extern struct kmem_cache *drbd_al_ext_cache; /* activity log extents */ extern mempool_t *drbd_request_mempool; extern mempool_t *drbd_ee_mempool; -extern struct page *drbd_pp_pool; /* drbd's page pool */ +/* drbd's page pool, used to buffer data received from the peer, + * or data requested by the peer. + * + * This does not have an emergency reserve. + * + * When allocating from this pool, it first takes pages from the pool. + * Only if the pool is depleted will try to allocate from the system. + * + * The assumption is that pages taken from this pool will be processed, + * and given back, "quickly", and then can be recycled, so we can avoid + * frequent calls to alloc_page(), and still will be able to make progress even + * under memory pressure. + */ +extern struct page *drbd_pp_pool; extern spinlock_t drbd_pp_lock; extern int drbd_pp_vacant; extern wait_queue_head_t drbd_pp_wait; +/* We also need a standard (emergency-reserve backed) page pool + * for meta data IO (activity log, bitmap). + * We can keep it global, as long as it is used as "N pages at a time". + * 128 should be plenty, currently we probably can get away with as few as 1. + */ +#define DRBD_MIN_POOL_PAGES 128 +extern mempool_t *drbd_md_io_page_pool; + +/* We also need to make sure we get a bio + * when we need it for housekeeping purposes */ +extern struct bio_set *drbd_md_io_bio_set; +/* to allocate from that set */ +extern struct bio *bio_alloc_drbd(gfp_t gfp_mask); + extern rwlock_t global_state_lock; -extern struct drbd_conf *drbd_new_device(unsigned int minor); -extern void drbd_free_mdev(struct drbd_conf *mdev); +extern int conn_lowest_minor(struct drbd_connection *connection); +extern enum drbd_ret_code drbd_create_device(struct drbd_config_context *adm_ctx, unsigned int minor); +extern void drbd_destroy_device(struct kref *kref); +extern void drbd_delete_device(struct drbd_device *device); + +extern struct drbd_resource *drbd_create_resource(const char *name); +extern void drbd_free_resource(struct drbd_resource *resource); + +extern int set_resource_options(struct drbd_resource *resource, struct res_opts *res_opts); +extern struct drbd_connection *conn_create(const char *name, struct res_opts *res_opts); +extern void drbd_destroy_connection(struct kref *kref); +extern struct drbd_connection *conn_get_by_addrs(void *my_addr, int my_addr_len, + void *peer_addr, int peer_addr_len); +extern struct drbd_resource *drbd_find_resource(const char *name); +extern void drbd_destroy_resource(struct kref *kref); +extern void conn_free_crypto(struct drbd_connection *connection); extern int proc_details; /* drbd_req */ -extern int drbd_make_request_26(struct request_queue *q, struct bio *bio); -extern int drbd_read_remote(struct drbd_conf *mdev, struct drbd_request *req); +extern void do_submit(struct work_struct *ws); +extern void __drbd_make_request(struct drbd_device *, struct bio *, unsigned long); +extern void drbd_make_request(struct request_queue *q, struct bio *bio); +extern int drbd_read_remote(struct drbd_device *device, struct drbd_request *req); extern int drbd_merge_bvec(struct request_queue *q, struct bvec_merge_data *bvm, struct bio_vec *bvec); extern int is_valid_ar_handle(struct drbd_request *, sector_t); /* drbd_nl.c */ -extern void drbd_suspend_io(struct drbd_conf *mdev); -extern void drbd_resume_io(struct drbd_conf *mdev); +extern int drbd_msg_put_info(struct sk_buff *skb, const char *info); +extern void drbd_suspend_io(struct drbd_device *device); +extern void drbd_resume_io(struct drbd_device *device); extern char *ppsize(char *buf, unsigned long long size); -extern sector_t drbd_new_dev_size(struct drbd_conf *, struct drbd_backing_dev *, int); -enum determine_dev_size { dev_size_error = -1, unchanged = 0, shrunk = 1, grew = 2 }; -extern enum determine_dev_size drbd_determin_dev_size(struct drbd_conf *, enum dds_flags) __must_hold(local); -extern void resync_after_online_grow(struct drbd_conf *); -extern void drbd_setup_queue_param(struct drbd_conf *mdev, unsigned int) __must_hold(local); -extern int drbd_set_role(struct drbd_conf *mdev, enum drbd_role new_role, - int force); -extern enum drbd_disk_state drbd_try_outdate_peer(struct drbd_conf *mdev); -extern void drbd_try_outdate_peer_async(struct drbd_conf *mdev); -extern int drbd_khelper(struct drbd_conf *mdev, char *cmd); +extern sector_t drbd_new_dev_size(struct drbd_device *, struct drbd_backing_dev *, sector_t, int); +enum determine_dev_size { + DS_ERROR_SHRINK = -3, + DS_ERROR_SPACE_MD = -2, + DS_ERROR = -1, + DS_UNCHANGED = 0, + DS_SHRUNK = 1, + DS_GREW = 2, + DS_GREW_FROM_ZERO = 3, +}; +extern enum determine_dev_size +drbd_determine_dev_size(struct drbd_device *, enum dds_flags, struct resize_parms *) __must_hold(local); +extern void resync_after_online_grow(struct drbd_device *); +extern void drbd_reconsider_max_bio_size(struct drbd_device *device); +extern enum drbd_state_rv drbd_set_role(struct drbd_device *device, + enum drbd_role new_role, + int force); +extern bool conn_try_outdate_peer(struct drbd_connection *connection); +extern void conn_try_outdate_peer_async(struct drbd_connection *connection); +extern int drbd_khelper(struct drbd_device *device, char *cmd); /* drbd_worker.c */ +/* bi_end_io handlers */ +extern void drbd_md_io_complete(struct bio *bio, int error); +extern void drbd_peer_request_endio(struct bio *bio, int error); +extern void drbd_request_endio(struct bio *bio, int error); extern int drbd_worker(struct drbd_thread *thi); -extern int drbd_alter_sa(struct drbd_conf *mdev, int na); -extern void drbd_start_resync(struct drbd_conf *mdev, enum drbd_conns side); -extern void resume_next_sg(struct drbd_conf *mdev); -extern void suspend_other_sg(struct drbd_conf *mdev); -extern int drbd_resync_finished(struct drbd_conf *mdev); +enum drbd_ret_code drbd_resync_after_valid(struct drbd_device *device, int o_minor); +void drbd_resync_after_changed(struct drbd_device *device); +extern void drbd_start_resync(struct drbd_device *device, enum drbd_conns side); +extern void resume_next_sg(struct drbd_device *device); +extern void suspend_other_sg(struct drbd_device *device); +extern int drbd_resync_finished(struct drbd_device *device); /* maybe rather drbd_main.c ? */ -extern int drbd_md_sync_page_io(struct drbd_conf *mdev, +extern void *drbd_md_get_buffer(struct drbd_device *device); +extern void drbd_md_put_buffer(struct drbd_device *device); +extern int drbd_md_sync_page_io(struct drbd_device *device, struct drbd_backing_dev *bdev, sector_t sector, int rw); -extern void drbd_ov_oos_found(struct drbd_conf*, sector_t, int); +extern void drbd_ov_out_of_sync_found(struct drbd_device *, sector_t, int); +extern void wait_until_done_or_force_detached(struct drbd_device *device, + struct drbd_backing_dev *bdev, unsigned int *done); +extern void drbd_rs_controller_reset(struct drbd_device *device); -static inline void ov_oos_print(struct drbd_conf *mdev) +static inline void ov_out_of_sync_print(struct drbd_device *device) { - if (mdev->ov_last_oos_size) { - dev_err(DEV, "Out of sync: start=%llu, size=%lu (sectors)\n", - (unsigned long long)mdev->ov_last_oos_start, - (unsigned long)mdev->ov_last_oos_size); + if (device->ov_last_oos_size) { + drbd_err(device, "Out of sync: start=%llu, size=%lu (sectors)\n", + (unsigned long long)device->ov_last_oos_start, + (unsigned long)device->ov_last_oos_size); } - mdev->ov_last_oos_size=0; + device->ov_last_oos_size = 0; } -extern void drbd_csum_bio(struct drbd_conf *, struct crypto_hash *, struct bio *, void *); -extern void drbd_csum_ee(struct drbd_conf *, struct crypto_hash *, struct drbd_epoch_entry *, void *); +extern void drbd_csum_bio(struct crypto_hash *, struct bio *, void *); +extern void drbd_csum_ee(struct crypto_hash *, struct drbd_peer_request *, void *); /* worker callbacks */ -extern int w_req_cancel_conflict(struct drbd_conf *, struct drbd_work *, int); -extern int w_read_retry_remote(struct drbd_conf *, struct drbd_work *, int); -extern int w_e_end_data_req(struct drbd_conf *, struct drbd_work *, int); -extern int w_e_end_rsdata_req(struct drbd_conf *, struct drbd_work *, int); -extern int w_e_end_csum_rs_req(struct drbd_conf *, struct drbd_work *, int); -extern int w_e_end_ov_reply(struct drbd_conf *, struct drbd_work *, int); -extern int w_e_end_ov_req(struct drbd_conf *, struct drbd_work *, int); -extern int w_ov_finished(struct drbd_conf *, struct drbd_work *, int); -extern int w_resync_inactive(struct drbd_conf *, struct drbd_work *, int); -extern int w_resume_next_sg(struct drbd_conf *, struct drbd_work *, int); -extern int w_send_write_hint(struct drbd_conf *, struct drbd_work *, int); -extern int w_make_resync_request(struct drbd_conf *, struct drbd_work *, int); -extern int w_send_dblock(struct drbd_conf *, struct drbd_work *, int); -extern int w_send_barrier(struct drbd_conf *, struct drbd_work *, int); -extern int w_send_read_req(struct drbd_conf *, struct drbd_work *, int); -extern int w_prev_work_done(struct drbd_conf *, struct drbd_work *, int); -extern int w_e_reissue(struct drbd_conf *, struct drbd_work *, int); -extern int w_restart_disk_io(struct drbd_conf *, struct drbd_work *, int); +extern int w_e_end_data_req(struct drbd_work *, int); +extern int w_e_end_rsdata_req(struct drbd_work *, int); +extern int w_e_end_csum_rs_req(struct drbd_work *, int); +extern int w_e_end_ov_reply(struct drbd_work *, int); +extern int w_e_end_ov_req(struct drbd_work *, int); +extern int w_ov_finished(struct drbd_work *, int); +extern int w_resync_timer(struct drbd_work *, int); +extern int w_send_write_hint(struct drbd_work *, int); +extern int w_send_dblock(struct drbd_work *, int); +extern int w_send_read_req(struct drbd_work *, int); +extern int w_e_reissue(struct drbd_work *, int); +extern int w_restart_disk_io(struct drbd_work *, int); +extern int w_send_out_of_sync(struct drbd_work *, int); +extern int w_start_resync(struct drbd_work *, int); extern void resync_timer_fn(unsigned long data); +extern void start_resync_timer_fn(unsigned long data); + +extern void drbd_endio_write_sec_final(struct drbd_peer_request *peer_req); /* drbd_receiver.c */ -extern int drbd_rs_should_slow_down(struct drbd_conf *mdev); -extern int drbd_submit_ee(struct drbd_conf *mdev, struct drbd_epoch_entry *e, - const unsigned rw, const int fault_type); -extern int drbd_release_ee(struct drbd_conf *mdev, struct list_head *list); -extern struct drbd_epoch_entry *drbd_alloc_ee(struct drbd_conf *mdev, - u64 id, - sector_t sector, - unsigned int data_size, - gfp_t gfp_mask) __must_hold(local); -extern void drbd_free_some_ee(struct drbd_conf *mdev, struct drbd_epoch_entry *e, - int is_net); -#define drbd_free_ee(m,e) drbd_free_some_ee(m, e, 0) -#define drbd_free_net_ee(m,e) drbd_free_some_ee(m, e, 1) -extern void drbd_wait_ee_list_empty(struct drbd_conf *mdev, - struct list_head *head); -extern void _drbd_wait_ee_list_empty(struct drbd_conf *mdev, - struct list_head *head); -extern void drbd_set_recv_tcq(struct drbd_conf *mdev, int tcq_enabled); -extern void _drbd_clear_done_ee(struct drbd_conf *mdev, struct list_head *to_be_freed); -extern void drbd_flush_workqueue(struct drbd_conf *mdev); -extern void drbd_free_tl_hash(struct drbd_conf *mdev); - -/* yes, there is kernel_setsockopt, but only since 2.6.18. we don't need to - * mess with get_fs/set_fs, we know we are KERNEL_DS always. */ +extern int drbd_receiver(struct drbd_thread *thi); +extern int drbd_asender(struct drbd_thread *thi); +extern bool drbd_rs_c_min_rate_throttle(struct drbd_device *device); +extern bool drbd_rs_should_slow_down(struct drbd_device *device, sector_t sector); +extern int drbd_submit_peer_request(struct drbd_device *, + struct drbd_peer_request *, const unsigned, + const int); +extern int drbd_free_peer_reqs(struct drbd_device *, struct list_head *); +extern struct drbd_peer_request *drbd_alloc_peer_req(struct drbd_peer_device *, u64, + sector_t, unsigned int, + bool, + gfp_t) __must_hold(local); +extern void __drbd_free_peer_req(struct drbd_device *, struct drbd_peer_request *, + int); +#define drbd_free_peer_req(m,e) __drbd_free_peer_req(m, e, 0) +#define drbd_free_net_peer_req(m,e) __drbd_free_peer_req(m, e, 1) +extern struct page *drbd_alloc_pages(struct drbd_peer_device *, unsigned int, bool); +extern void drbd_set_recv_tcq(struct drbd_device *device, int tcq_enabled); +extern void _drbd_clear_done_ee(struct drbd_device *device, struct list_head *to_be_freed); +extern int drbd_connected(struct drbd_peer_device *); + +/* Yes, there is kernel_setsockopt, but only since 2.6.18. + * So we have our own copy of it here. */ static inline int drbd_setsockopt(struct socket *sock, int level, int optname, - char __user *optval, int optlen) + char *optval, int optlen) { + mm_segment_t oldfs = get_fs(); + char __user *uoptval; int err; + + uoptval = (char __user __force *)optval; + + set_fs(KERNEL_DS); if (level == SOL_SOCKET) - err = sock_setsockopt(sock, level, optname, optval, optlen); + err = sock_setsockopt(sock, level, optname, uoptval, optlen); else - err = sock->ops->setsockopt(sock, level, optname, optval, + err = sock->ops->setsockopt(sock, level, optname, uoptval, optlen); + set_fs(oldfs); return err; } static inline void drbd_tcp_cork(struct socket *sock) { - int __user val = 1; + int val = 1; (void) drbd_setsockopt(sock, SOL_TCP, TCP_CORK, - (char __user *)&val, sizeof(val)); + (char*)&val, sizeof(val)); } static inline void drbd_tcp_uncork(struct socket *sock) { - int __user val = 0; + int val = 0; (void) drbd_setsockopt(sock, SOL_TCP, TCP_CORK, - (char __user *)&val, sizeof(val)); + (char*)&val, sizeof(val)); } static inline void drbd_tcp_nodelay(struct socket *sock) { - int __user val = 1; + int val = 1; (void) drbd_setsockopt(sock, SOL_TCP, TCP_NODELAY, - (char __user *)&val, sizeof(val)); + (char*)&val, sizeof(val)); } static inline void drbd_tcp_quickack(struct socket *sock) { - int __user val = 2; + int val = 2; (void) drbd_setsockopt(sock, SOL_TCP, TCP_QUICKACK, - (char __user *)&val, sizeof(val)); + (char*)&val, sizeof(val)); } -void drbd_bump_write_ordering(struct drbd_conf *mdev, enum write_ordering_e wo); +/* sets the number of 512 byte sectors of our virtual device */ +static inline void drbd_set_my_capacity(struct drbd_device *device, + sector_t size) +{ + /* set_capacity(device->this_bdev->bd_disk, size); */ + set_capacity(device->vdisk, size); + device->this_bdev->bd_inode->i_size = (loff_t)size << 9; +} + +/* + * used to submit our private bio + */ +static inline void drbd_generic_make_request(struct drbd_device *device, + int fault_type, struct bio *bio) +{ + __release(local); + if (!bio->bi_bdev) { + printk(KERN_ERR "drbd%d: drbd_generic_make_request: " + "bio->bi_bdev == NULL\n", + device_to_minor(device)); + dump_stack(); + bio_endio(bio, -ENODEV); + return; + } + + if (drbd_insert_fault(device, fault_type)) + bio_endio(bio, -EIO); + else + generic_make_request(bio); +} + +void drbd_bump_write_ordering(struct drbd_connection *connection, enum write_ordering_e wo); /* drbd_proc.c */ extern struct proc_dir_entry *drbd_proc; @@ -1611,92 +1487,47 @@ extern const char *drbd_conn_str(enum drbd_conns s); extern const char *drbd_role_str(enum drbd_role s); /* drbd_actlog.c */ -extern void drbd_al_begin_io(struct drbd_conf *mdev, sector_t sector); -extern void drbd_al_complete_io(struct drbd_conf *mdev, sector_t sector); -extern void drbd_rs_complete_io(struct drbd_conf *mdev, sector_t sector); -extern int drbd_rs_begin_io(struct drbd_conf *mdev, sector_t sector); -extern int drbd_try_rs_begin_io(struct drbd_conf *mdev, sector_t sector); -extern void drbd_rs_cancel_all(struct drbd_conf *mdev); -extern int drbd_rs_del_all(struct drbd_conf *mdev); -extern void drbd_rs_failed_io(struct drbd_conf *mdev, +extern bool drbd_al_begin_io_prepare(struct drbd_device *device, struct drbd_interval *i); +extern int drbd_al_begin_io_nonblock(struct drbd_device *device, struct drbd_interval *i); +extern void drbd_al_begin_io_commit(struct drbd_device *device, bool delegate); +extern bool drbd_al_begin_io_fastpath(struct drbd_device *device, struct drbd_interval *i); +extern void drbd_al_begin_io(struct drbd_device *device, struct drbd_interval *i, bool delegate); +extern void drbd_al_complete_io(struct drbd_device *device, struct drbd_interval *i); +extern void drbd_rs_complete_io(struct drbd_device *device, sector_t sector); +extern int drbd_rs_begin_io(struct drbd_device *device, sector_t sector); +extern int drbd_try_rs_begin_io(struct drbd_device *device, sector_t sector); +extern void drbd_rs_cancel_all(struct drbd_device *device); +extern int drbd_rs_del_all(struct drbd_device *device); +extern void drbd_rs_failed_io(struct drbd_device *device, sector_t sector, int size); -extern int drbd_al_read_log(struct drbd_conf *mdev, struct drbd_backing_dev *); -extern void __drbd_set_in_sync(struct drbd_conf *mdev, sector_t sector, +extern void drbd_advance_rs_marks(struct drbd_device *device, unsigned long still_to_go); +extern void __drbd_set_in_sync(struct drbd_device *device, sector_t sector, int size, const char *file, const unsigned int line); -#define drbd_set_in_sync(mdev, sector, size) \ - __drbd_set_in_sync(mdev, sector, size, __FILE__, __LINE__) -extern void __drbd_set_out_of_sync(struct drbd_conf *mdev, sector_t sector, +#define drbd_set_in_sync(device, sector, size) \ + __drbd_set_in_sync(device, sector, size, __FILE__, __LINE__) +extern int __drbd_set_out_of_sync(struct drbd_device *device, sector_t sector, int size, const char *file, const unsigned int line); -#define drbd_set_out_of_sync(mdev, sector, size) \ - __drbd_set_out_of_sync(mdev, sector, size, __FILE__, __LINE__) -extern void drbd_al_apply_to_bm(struct drbd_conf *mdev); -extern void drbd_al_to_on_disk_bm(struct drbd_conf *mdev); -extern void drbd_al_shrink(struct drbd_conf *mdev); - +#define drbd_set_out_of_sync(device, sector, size) \ + __drbd_set_out_of_sync(device, sector, size, __FILE__, __LINE__) +extern void drbd_al_shrink(struct drbd_device *device); +extern int drbd_initialize_al(struct drbd_device *, void *); /* drbd_nl.c */ - -void drbd_nl_cleanup(void); -int __init drbd_nl_init(void); -void drbd_bcast_state(struct drbd_conf *mdev, union drbd_state); -void drbd_bcast_sync_progress(struct drbd_conf *mdev); -void drbd_bcast_ee(struct drbd_conf *mdev, - const char *reason, const int dgs, - const char* seen_hash, const char* calc_hash, - const struct drbd_epoch_entry* e); - - -/** - * DOC: DRBD State macros - * - * These macros are used to express state changes in easily readable form. - * - * The NS macros expand to a mask and a value, that can be bit ored onto the - * current state as soon as the spinlock (req_lock) was taken. - * - * The _NS macros are used for state functions that get called with the - * spinlock. These macros expand directly to the new state value. - * - * Besides the basic forms NS() and _NS() additional _?NS[23] are defined - * to express state changes that affect more than one aspect of the state. - * - * E.g. NS2(conn, C_CONNECTED, peer, R_SECONDARY) - * Means that the network connection was established and that the peer - * is in secondary role. - */ -#define role_MASK R_MASK -#define peer_MASK R_MASK -#define disk_MASK D_MASK -#define pdsk_MASK D_MASK -#define conn_MASK C_MASK -#define susp_MASK 1 -#define user_isp_MASK 1 -#define aftr_isp_MASK 1 -#define susp_nod_MASK 1 -#define susp_fen_MASK 1 - -#define NS(T, S) \ - ({ union drbd_state mask; mask.i = 0; mask.T = T##_MASK; mask; }), \ - ({ union drbd_state val; val.i = 0; val.T = (S); val; }) -#define NS2(T1, S1, T2, S2) \ - ({ union drbd_state mask; mask.i = 0; mask.T1 = T1##_MASK; \ - mask.T2 = T2##_MASK; mask; }), \ - ({ union drbd_state val; val.i = 0; val.T1 = (S1); \ - val.T2 = (S2); val; }) -#define NS3(T1, S1, T2, S2, T3, S3) \ - ({ union drbd_state mask; mask.i = 0; mask.T1 = T1##_MASK; \ - mask.T2 = T2##_MASK; mask.T3 = T3##_MASK; mask; }), \ - ({ union drbd_state val; val.i = 0; val.T1 = (S1); \ - val.T2 = (S2); val.T3 = (S3); val; }) - -#define _NS(D, T, S) \ - D, ({ union drbd_state __ns; __ns.i = D->state.i; __ns.T = (S); __ns; }) -#define _NS2(D, T1, S1, T2, S2) \ - D, ({ union drbd_state __ns; __ns.i = D->state.i; __ns.T1 = (S1); \ - __ns.T2 = (S2); __ns; }) -#define _NS3(D, T1, S1, T2, S2, T3, S3) \ - D, ({ union drbd_state __ns; __ns.i = D->state.i; __ns.T1 = (S1); \ - __ns.T2 = (S2); __ns.T3 = (S3); __ns; }) +/* state info broadcast */ +struct sib_info { + enum drbd_state_info_bcast_reason sib_reason; + union { + struct { + char *helper_name; + unsigned helper_exit_code; + }; + struct { + union drbd_state os; + union drbd_state ns; + }; + }; +}; +void drbd_bcast_event(struct drbd_device *device, const struct sib_info *sib); /* * inline helper functions @@ -1713,22 +1544,10 @@ static inline struct page *page_chain_next(struct page *page) #define page_chain_for_each_safe(page, n) \ for (; page && ({ n = page_chain_next(page); 1; }); page = n) -static inline int drbd_bio_has_active_page(struct bio *bio) -{ - struct bio_vec *bvec; - int i; - - __bio_for_each_segment(bvec, bio, i, 0) { - if (page_count(bvec->bv_page) > 1) - return 1; - } - return 0; -} - -static inline int drbd_ee_has_active_page(struct drbd_epoch_entry *e) +static inline int drbd_peer_req_has_active_page(struct drbd_peer_request *peer_req) { - struct page *page = e->pages; + struct page *page = peer_req->pages; page_chain_for_each(page) { if (page_count(page) > 1) return 1; @@ -1736,66 +1555,89 @@ static inline int drbd_ee_has_active_page(struct drbd_epoch_entry *e) return 0; } - -static inline void drbd_state_lock(struct drbd_conf *mdev) -{ - wait_event(mdev->misc_wait, - !test_and_set_bit(CLUSTER_ST_CHANGE, &mdev->flags)); -} - -static inline void drbd_state_unlock(struct drbd_conf *mdev) +static inline enum drbd_state_rv +_drbd_set_state(struct drbd_device *device, union drbd_state ns, + enum chg_state_flags flags, struct completion *done) { - clear_bit(CLUSTER_ST_CHANGE, &mdev->flags); - wake_up(&mdev->misc_wait); -} - -static inline int _drbd_set_state(struct drbd_conf *mdev, - union drbd_state ns, enum chg_state_flags flags, - struct completion *done) -{ - int rv; + enum drbd_state_rv rv; read_lock(&global_state_lock); - rv = __drbd_set_state(mdev, ns, flags, done); + rv = __drbd_set_state(device, ns, flags, done); read_unlock(&global_state_lock); return rv; } -/** - * drbd_request_state() - Reqest a state change - * @mdev: DRBD device. - * @mask: mask of state bits to change. - * @val: value of new state bits. - * - * This is the most graceful way of requesting a state change. It is verbose - * quite verbose in case the state change is not possible, and all those - * state changes are globally serialized. - */ -static inline int drbd_request_state(struct drbd_conf *mdev, - union drbd_state mask, - union drbd_state val) +static inline union drbd_state drbd_read_state(struct drbd_device *device) { - return _drbd_request_state(mdev, mask, val, CS_VERBOSE + CS_ORDERED); + struct drbd_resource *resource = device->resource; + union drbd_state rv; + + rv.i = device->state.i; + rv.susp = resource->susp; + rv.susp_nod = resource->susp_nod; + rv.susp_fen = resource->susp_fen; + + return rv; } +enum drbd_force_detach_flags { + DRBD_READ_ERROR, + DRBD_WRITE_ERROR, + DRBD_META_IO_ERROR, + DRBD_FORCE_DETACH, +}; + #define __drbd_chk_io_error(m,f) __drbd_chk_io_error_(m,f, __func__) -static inline void __drbd_chk_io_error_(struct drbd_conf *mdev, int forcedetach, const char *where) -{ - switch (mdev->ldev->dc.on_io_error) { - case EP_PASS_ON: - if (!forcedetach) { +static inline void __drbd_chk_io_error_(struct drbd_device *device, + enum drbd_force_detach_flags df, + const char *where) +{ + enum drbd_io_error_p ep; + + rcu_read_lock(); + ep = rcu_dereference(device->ldev->disk_conf)->on_io_error; + rcu_read_unlock(); + switch (ep) { + case EP_PASS_ON: /* FIXME would this be better named "Ignore"? */ + if (df == DRBD_READ_ERROR || df == DRBD_WRITE_ERROR) { if (__ratelimit(&drbd_ratelimit_state)) - dev_err(DEV, "Local IO failed in %s.\n", where); + drbd_err(device, "Local IO failed in %s.\n", where); + if (device->state.disk > D_INCONSISTENT) + _drbd_set_state(_NS(device, disk, D_INCONSISTENT), CS_HARD, NULL); break; } - /* NOTE fall through to detach case if forcedetach set */ + /* NOTE fall through for DRBD_META_IO_ERROR or DRBD_FORCE_DETACH */ case EP_DETACH: case EP_CALL_HELPER: - set_bit(WAS_IO_ERROR, &mdev->flags); - if (mdev->state.disk > D_FAILED) { - _drbd_set_state(_NS(mdev, disk, D_FAILED), CS_HARD, NULL); - dev_err(DEV, + /* Remember whether we saw a READ or WRITE error. + * + * Recovery of the affected area for WRITE failure is covered + * by the activity log. + * READ errors may fall outside that area though. Certain READ + * errors can be "healed" by writing good data to the affected + * blocks, which triggers block re-allocation in lower layers. + * + * If we can not write the bitmap after a READ error, + * we may need to trigger a full sync (see w_go_diskless()). + * + * Force-detach is not really an IO error, but rather a + * desperate measure to try to deal with a completely + * unresponsive lower level IO stack. + * Still it should be treated as a WRITE error. + * + * Meta IO error is always WRITE error: + * we read meta data only once during attach, + * which will fail in case of errors. + */ + set_bit(WAS_IO_ERROR, &device->flags); + if (df == DRBD_READ_ERROR) + set_bit(WAS_READ_ERROR, &device->flags); + if (df == DRBD_FORCE_DETACH) + set_bit(FORCE_DETACH, &device->flags); + if (device->state.disk > D_FAILED) { + _drbd_set_state(_NS(device, disk, D_FAILED), CS_HARD, NULL); + drbd_err(device, "Local IO failed in %s. Detaching...\n", where); } break; @@ -1804,21 +1646,21 @@ static inline void __drbd_chk_io_error_(struct drbd_conf *mdev, int forcedetach, /** * drbd_chk_io_error: Handle the on_io_error setting, should be called from all io completion handlers - * @mdev: DRBD device. + * @device: DRBD device. * @error: Error code passed to the IO completion callback * @forcedetach: Force detach. I.e. the error happened while accessing the meta data * * See also drbd_main.c:after_state_ch() if (os.disk > D_FAILED && ns.disk == D_FAILED) */ #define drbd_chk_io_error(m,e,f) drbd_chk_io_error_(m,e,f, __func__) -static inline void drbd_chk_io_error_(struct drbd_conf *mdev, - int error, int forcedetach, const char *where) +static inline void drbd_chk_io_error_(struct drbd_device *device, + int error, enum drbd_force_detach_flags forcedetach, const char *where) { if (error) { unsigned long flags; - spin_lock_irqsave(&mdev->req_lock, flags); - __drbd_chk_io_error_(mdev, forcedetach, where); - spin_unlock_irqrestore(&mdev->req_lock, flags); + spin_lock_irqsave(&device->resource->req_lock, flags); + __drbd_chk_io_error_(device, forcedetach, where); + spin_unlock_irqrestore(&device->resource->req_lock, flags); } } @@ -1832,7 +1674,7 @@ static inline void drbd_chk_io_error_(struct drbd_conf *mdev, */ static inline sector_t drbd_md_first_sector(struct drbd_backing_dev *bdev) { - switch (bdev->dc.meta_dev_idx) { + switch (bdev->md.meta_dev_idx) { case DRBD_MD_INDEX_INTERNAL: case DRBD_MD_INDEX_FLEX_INT: return bdev->md.md_offset + bdev->md.bm_offset; @@ -1848,13 +1690,13 @@ static inline sector_t drbd_md_first_sector(struct drbd_backing_dev *bdev) */ static inline sector_t drbd_md_last_sector(struct drbd_backing_dev *bdev) { - switch (bdev->dc.meta_dev_idx) { + switch (bdev->md.meta_dev_idx) { case DRBD_MD_INDEX_INTERNAL: case DRBD_MD_INDEX_FLEX_INT: - return bdev->md.md_offset + MD_AL_OFFSET - 1; + return bdev->md.md_offset + MD_4kB_SECT -1; case DRBD_MD_INDEX_FLEX_EXT: default: - return bdev->md.md_offset + bdev->md.md_size_sect; + return bdev->md.md_offset + bdev->md.md_size_sect -1; } } @@ -1876,12 +1718,13 @@ static inline sector_t drbd_get_capacity(struct block_device *bdev) static inline sector_t drbd_get_max_capacity(struct drbd_backing_dev *bdev) { sector_t s; - switch (bdev->dc.meta_dev_idx) { + + switch (bdev->md.meta_dev_idx) { case DRBD_MD_INDEX_INTERNAL: case DRBD_MD_INDEX_FLEX_INT: s = drbd_get_capacity(bdev->backing_bdev) ? min_t(sector_t, DRBD_MAX_SECTORS_FLEX, - drbd_md_first_sector(bdev)) + drbd_md_first_sector(bdev)) : 0; break; case DRBD_MD_INDEX_FLEX_EXT: @@ -1900,33 +1743,24 @@ static inline sector_t drbd_get_max_capacity(struct drbd_backing_dev *bdev) } /** - * drbd_md_ss__() - Return the sector number of our meta data super block - * @mdev: DRBD device. + * drbd_md_ss() - Return the sector number of our meta data super block * @bdev: Meta data block device. */ -static inline sector_t drbd_md_ss__(struct drbd_conf *mdev, - struct drbd_backing_dev *bdev) +static inline sector_t drbd_md_ss(struct drbd_backing_dev *bdev) { - switch (bdev->dc.meta_dev_idx) { - default: /* external, some index */ - return MD_RESERVED_SECT * bdev->dc.meta_dev_idx; - case DRBD_MD_INDEX_INTERNAL: - /* with drbd08, internal meta data is always "flexible" */ - case DRBD_MD_INDEX_FLEX_INT: - /* sizeof(struct md_on_disk_07) == 4k - * position: last 4k aligned block of 4k size */ - if (!bdev->backing_bdev) { - if (__ratelimit(&drbd_ratelimit_state)) { - dev_err(DEV, "bdev->backing_bdev==NULL\n"); - dump_stack(); - } - return 0; - } - return (drbd_get_capacity(bdev->backing_bdev) & ~7ULL) - - MD_AL_OFFSET; - case DRBD_MD_INDEX_FLEX_EXT: + const int meta_dev_idx = bdev->md.meta_dev_idx; + + if (meta_dev_idx == DRBD_MD_INDEX_FLEX_EXT) return 0; - } + + /* Since drbd08, internal meta data is always "flexible". + * position: last 4k aligned block of 4k size */ + if (meta_dev_idx == DRBD_MD_INDEX_INTERNAL || + meta_dev_idx == DRBD_MD_INDEX_FLEX_INT) + return (drbd_get_capacity(bdev->backing_bdev) & ~7ULL) - 8; + + /* external, some index; this is the old fixed size layout */ + return MD_128MB_SECT * bdev->md.meta_dev_idx; } static inline void @@ -1935,9 +1769,8 @@ drbd_queue_work_front(struct drbd_work_queue *q, struct drbd_work *w) unsigned long flags; spin_lock_irqsave(&q->q_lock, flags); list_add(&w->list, &q->q); - up(&q->s); /* within the spinlock, - see comment near end of drbd_worker() */ spin_unlock_irqrestore(&q->q_lock, flags); + wake_up(&q->q_wait); } static inline void @@ -1946,55 +1779,51 @@ drbd_queue_work(struct drbd_work_queue *q, struct drbd_work *w) unsigned long flags; spin_lock_irqsave(&q->q_lock, flags); list_add_tail(&w->list, &q->q); - up(&q->s); /* within the spinlock, - see comment near end of drbd_worker() */ spin_unlock_irqrestore(&q->q_lock, flags); + wake_up(&q->q_wait); } -static inline void wake_asender(struct drbd_conf *mdev) -{ - if (test_bit(SIGNAL_ASENDER, &mdev->flags)) - force_sig(DRBD_SIG, mdev->asender.task); -} +extern void drbd_flush_workqueue(struct drbd_work_queue *work_queue); -static inline void request_ping(struct drbd_conf *mdev) +static inline void wake_asender(struct drbd_connection *connection) { - set_bit(SEND_PING, &mdev->flags); - wake_asender(mdev); + if (test_bit(SIGNAL_ASENDER, &connection->flags)) + force_sig(DRBD_SIG, connection->asender.task); } -static inline int drbd_send_short_cmd(struct drbd_conf *mdev, - enum drbd_packets cmd) +static inline void request_ping(struct drbd_connection *connection) { - struct p_header80 h; - return drbd_send_cmd(mdev, USE_DATA_SOCKET, cmd, &h, sizeof(h)); + set_bit(SEND_PING, &connection->flags); + wake_asender(connection); } -static inline int drbd_send_ping(struct drbd_conf *mdev) -{ - struct p_header80 h; - return drbd_send_cmd(mdev, USE_META_SOCKET, P_PING, &h, sizeof(h)); -} +extern void *conn_prepare_command(struct drbd_connection *, struct drbd_socket *); +extern void *drbd_prepare_command(struct drbd_peer_device *, struct drbd_socket *); +extern int conn_send_command(struct drbd_connection *, struct drbd_socket *, + enum drbd_packet, unsigned int, void *, + unsigned int); +extern int drbd_send_command(struct drbd_peer_device *, struct drbd_socket *, + enum drbd_packet, unsigned int, void *, + unsigned int); -static inline int drbd_send_ping_ack(struct drbd_conf *mdev) -{ - struct p_header80 h; - return drbd_send_cmd(mdev, USE_META_SOCKET, P_PING_ACK, &h, sizeof(h)); -} +extern int drbd_send_ping(struct drbd_connection *connection); +extern int drbd_send_ping_ack(struct drbd_connection *connection); +extern int drbd_send_state_req(struct drbd_peer_device *, union drbd_state, union drbd_state); +extern int conn_send_state_req(struct drbd_connection *, union drbd_state, union drbd_state); static inline void drbd_thread_stop(struct drbd_thread *thi) { - _drbd_thread_stop(thi, FALSE, TRUE); + _drbd_thread_stop(thi, false, true); } static inline void drbd_thread_stop_nowait(struct drbd_thread *thi) { - _drbd_thread_stop(thi, FALSE, FALSE); + _drbd_thread_stop(thi, false, false); } static inline void drbd_thread_restart_nowait(struct drbd_thread *thi) { - _drbd_thread_stop(thi, TRUE, FALSE); + _drbd_thread_stop(thi, true, false); } /* counts how many answer packets packets we expect from our peer, @@ -2002,55 +1831,59 @@ static inline void drbd_thread_restart_nowait(struct drbd_thread *thi) * or implicit barrier packets as necessary. * increased: * w_send_barrier - * _req_mod(req, queue_for_net_write or queue_for_net_read); + * _req_mod(req, QUEUE_FOR_NET_WRITE or QUEUE_FOR_NET_READ); * it is much easier and equally valid to count what we queue for the * worker, even before it actually was queued or send. * (drbd_make_request_common; recovery path on read io-error) * decreased: * got_BarrierAck (respective tl_clear, tl_clear_barrier) - * _req_mod(req, data_received) + * _req_mod(req, DATA_RECEIVED) * [from receive_DataReply] - * _req_mod(req, write_acked_by_peer or recv_acked_by_peer or neg_acked) + * _req_mod(req, WRITE_ACKED_BY_PEER or RECV_ACKED_BY_PEER or NEG_ACKED) * [from got_BlockAck (P_WRITE_ACK, P_RECV_ACK)] * for some reason it is NOT decreased in got_NegAck, * but in the resulting cleanup code from report_params. * we should try to remember the reason for that... - * _req_mod(req, send_failed or send_canceled) - * _req_mod(req, connection_lost_while_pending) + * _req_mod(req, SEND_FAILED or SEND_CANCELED) + * _req_mod(req, CONNECTION_LOST_WHILE_PENDING) * [from tl_clear_barrier] */ -static inline void inc_ap_pending(struct drbd_conf *mdev) +static inline void inc_ap_pending(struct drbd_device *device) { - atomic_inc(&mdev->ap_pending_cnt); + atomic_inc(&device->ap_pending_cnt); } -#define ERR_IF_CNT_IS_NEGATIVE(which) \ - if (atomic_read(&mdev->which) < 0) \ - dev_err(DEV, "in %s:%d: " #which " = %d < 0 !\n", \ - __func__ , __LINE__ , \ - atomic_read(&mdev->which)) +#define ERR_IF_CNT_IS_NEGATIVE(which, func, line) \ + if (atomic_read(&device->which) < 0) \ + drbd_err(device, "in %s:%d: " #which " = %d < 0 !\n", \ + func, line, \ + atomic_read(&device->which)) -#define dec_ap_pending(mdev) do { \ - typecheck(struct drbd_conf *, mdev); \ - if (atomic_dec_and_test(&mdev->ap_pending_cnt)) \ - wake_up(&mdev->misc_wait); \ - ERR_IF_CNT_IS_NEGATIVE(ap_pending_cnt); } while (0) +#define dec_ap_pending(device) _dec_ap_pending(device, __FUNCTION__, __LINE__) +static inline void _dec_ap_pending(struct drbd_device *device, const char *func, int line) +{ + if (atomic_dec_and_test(&device->ap_pending_cnt)) + wake_up(&device->misc_wait); + ERR_IF_CNT_IS_NEGATIVE(ap_pending_cnt, func, line); +} /* counts how many resync-related answers we still expect from the peer * increase decrease * C_SYNC_TARGET sends P_RS_DATA_REQUEST (and expects P_RS_DATA_REPLY) - * C_SYNC_SOURCE sends P_RS_DATA_REPLY (and expects P_WRITE_ACK whith ID_SYNCER) + * C_SYNC_SOURCE sends P_RS_DATA_REPLY (and expects P_WRITE_ACK with ID_SYNCER) * (or P_NEG_ACK with ID_SYNCER) */ -static inline void inc_rs_pending(struct drbd_conf *mdev) +static inline void inc_rs_pending(struct drbd_device *device) { - atomic_inc(&mdev->rs_pending_cnt); + atomic_inc(&device->rs_pending_cnt); } -#define dec_rs_pending(mdev) do { \ - typecheck(struct drbd_conf *, mdev); \ - atomic_dec(&mdev->rs_pending_cnt); \ - ERR_IF_CNT_IS_NEGATIVE(rs_pending_cnt); } while (0) +#define dec_rs_pending(device) _dec_rs_pending(device, __FUNCTION__, __LINE__) +static inline void _dec_rs_pending(struct drbd_device *device, const char *func, int line) +{ + atomic_dec(&device->rs_pending_cnt); + ERR_IF_CNT_IS_NEGATIVE(rs_pending_cnt, func, line); +} /* counts how many answers we still need to send to the peer. * increased on @@ -2061,122 +1894,119 @@ static inline void inc_rs_pending(struct drbd_conf *mdev) * receive_DataRequest (receive_RSDataRequest) we need to send back P_DATA * receive_Barrier_* we need to send a P_BARRIER_ACK */ -static inline void inc_unacked(struct drbd_conf *mdev) +static inline void inc_unacked(struct drbd_device *device) { - atomic_inc(&mdev->unacked_cnt); + atomic_inc(&device->unacked_cnt); } -#define dec_unacked(mdev) do { \ - typecheck(struct drbd_conf *, mdev); \ - atomic_dec(&mdev->unacked_cnt); \ - ERR_IF_CNT_IS_NEGATIVE(unacked_cnt); } while (0) - -#define sub_unacked(mdev, n) do { \ - typecheck(struct drbd_conf *, mdev); \ - atomic_sub(n, &mdev->unacked_cnt); \ - ERR_IF_CNT_IS_NEGATIVE(unacked_cnt); } while (0) - - -static inline void put_net_conf(struct drbd_conf *mdev) +#define dec_unacked(device) _dec_unacked(device, __FUNCTION__, __LINE__) +static inline void _dec_unacked(struct drbd_device *device, const char *func, int line) { - if (atomic_dec_and_test(&mdev->net_cnt)) - wake_up(&mdev->net_cnt_wait); + atomic_dec(&device->unacked_cnt); + ERR_IF_CNT_IS_NEGATIVE(unacked_cnt, func, line); } -/** - * get_net_conf() - Increase ref count on mdev->net_conf; Returns 0 if nothing there - * @mdev: DRBD device. - * - * You have to call put_net_conf() when finished working with mdev->net_conf. - */ -static inline int get_net_conf(struct drbd_conf *mdev) +#define sub_unacked(device, n) _sub_unacked(device, n, __FUNCTION__, __LINE__) +static inline void _sub_unacked(struct drbd_device *device, int n, const char *func, int line) { - int have_net_conf; - - atomic_inc(&mdev->net_cnt); - have_net_conf = mdev->state.conn >= C_UNCONNECTED; - if (!have_net_conf) - put_net_conf(mdev); - return have_net_conf; + atomic_sub(n, &device->unacked_cnt); + ERR_IF_CNT_IS_NEGATIVE(unacked_cnt, func, line); } /** - * get_ldev() - Increase the ref count on mdev->ldev. Returns 0 if there is no ldev + * get_ldev() - Increase the ref count on device->ldev. Returns 0 if there is no ldev * @M: DRBD device. * - * You have to call put_ldev() when finished working with mdev->ldev. + * You have to call put_ldev() when finished working with device->ldev. */ #define get_ldev(M) __cond_lock(local, _get_ldev_if_state(M,D_INCONSISTENT)) #define get_ldev_if_state(M,MINS) __cond_lock(local, _get_ldev_if_state(M,MINS)) -static inline void put_ldev(struct drbd_conf *mdev) +static inline void put_ldev(struct drbd_device *device) { - int i = atomic_dec_return(&mdev->local_cnt); + int i = atomic_dec_return(&device->local_cnt); + + /* This may be called from some endio handler, + * so we must not sleep here. */ + __release(local); - D_ASSERT(i >= 0); + D_ASSERT(device, i >= 0); if (i == 0) { - if (mdev->state.disk == D_DISKLESS) + if (device->state.disk == D_DISKLESS) /* even internal references gone, safe to destroy */ - drbd_ldev_destroy(mdev); - if (mdev->state.disk == D_FAILED) + drbd_ldev_destroy(device); + if (device->state.disk == D_FAILED) { /* all application IO references gone. */ - drbd_go_diskless(mdev); - wake_up(&mdev->misc_wait); + if (!test_and_set_bit(GO_DISKLESS, &device->flags)) + drbd_queue_work(&first_peer_device(device)->connection->sender_work, + &device->go_diskless); + } + wake_up(&device->misc_wait); } } #ifndef __CHECKER__ -static inline int _get_ldev_if_state(struct drbd_conf *mdev, enum drbd_disk_state mins) +static inline int _get_ldev_if_state(struct drbd_device *device, enum drbd_disk_state mins) { int io_allowed; /* never get a reference while D_DISKLESS */ - if (mdev->state.disk == D_DISKLESS) + if (device->state.disk == D_DISKLESS) return 0; - atomic_inc(&mdev->local_cnt); - io_allowed = (mdev->state.disk >= mins); + atomic_inc(&device->local_cnt); + io_allowed = (device->state.disk >= mins); if (!io_allowed) - put_ldev(mdev); + put_ldev(device); return io_allowed; } #else -extern int _get_ldev_if_state(struct drbd_conf *mdev, enum drbd_disk_state mins); +extern int _get_ldev_if_state(struct drbd_device *device, enum drbd_disk_state mins); #endif /* you must have an "get_ldev" reference */ -static inline void drbd_get_syncer_progress(struct drbd_conf *mdev, +static inline void drbd_get_syncer_progress(struct drbd_device *device, unsigned long *bits_left, unsigned int *per_mil_done) { - /* - * this is to break it at compile time when we change that - * (we may feel 4TB maximum storage per drbd is not enough) - */ - typecheck(unsigned long, mdev->rs_total); + /* this is to break it at compile time when we change that, in case we + * want to support more than (1<<32) bits on a 32bit arch. */ + typecheck(unsigned long, device->rs_total); /* note: both rs_total and rs_left are in bits, i.e. in * units of BM_BLOCK_SIZE. * for the percentage, we don't care. */ - *bits_left = drbd_bm_total_weight(mdev) - mdev->rs_failed; + if (device->state.conn == C_VERIFY_S || device->state.conn == C_VERIFY_T) + *bits_left = device->ov_left; + else + *bits_left = drbd_bm_total_weight(device) - device->rs_failed; /* >> 10 to prevent overflow, * +1 to prevent division by zero */ - if (*bits_left > mdev->rs_total) { + if (*bits_left > device->rs_total) { /* doh. maybe a logic bug somewhere. * may also be just a race condition * between this and a disconnect during sync. * for now, just prevent in-kernel buffer overflow. */ smp_rmb(); - dev_warn(DEV, "cs:%s rs_left=%lu > rs_total=%lu (rs_failed %lu)\n", - drbd_conn_str(mdev->state.conn), - *bits_left, mdev->rs_total, mdev->rs_failed); + drbd_warn(device, "cs:%s rs_left=%lu > rs_total=%lu (rs_failed %lu)\n", + drbd_conn_str(device->state.conn), + *bits_left, device->rs_total, device->rs_failed); *per_mil_done = 0; } else { - /* make sure the calculation happens in long context */ - unsigned long tmp = 1000UL - - (*bits_left >> 10)*1000UL - / ((mdev->rs_total >> 10) + 1UL); + /* Make sure the division happens in long context. + * We allow up to one petabyte storage right now, + * at a granularity of 4k per bit that is 2**38 bits. + * After shift right and multiplication by 1000, + * this should still fit easily into a 32bit long, + * so we don't need a 64bit division on 32bit arch. + * Note: currently we don't support such large bitmaps on 32bit + * arch anyways, but no harm done to be prepared for it here. + */ + unsigned int shift = device->rs_total > UINT_MAX ? 16 : 10; + unsigned long left = *bits_left >> shift; + unsigned long total = 1UL + (device->rs_total >> shift); + unsigned long tmp = 1000UL - left * 1000UL/total; *per_mil_done = tmp; } } @@ -2185,18 +2015,22 @@ static inline void drbd_get_syncer_progress(struct drbd_conf *mdev, /* this throttles on-the-fly application requests * according to max_buffers settings; * maybe re-implement using semaphores? */ -static inline int drbd_get_max_buffers(struct drbd_conf *mdev) +static inline int drbd_get_max_buffers(struct drbd_device *device) { - int mxb = 1000000; /* arbitrary limit on open requests */ - if (get_net_conf(mdev)) { - mxb = mdev->net_conf->max_buffers; - put_net_conf(mdev); - } + struct net_conf *nc; + int mxb; + + rcu_read_lock(); + nc = rcu_dereference(first_peer_device(device)->connection->net_conf); + mxb = nc ? nc->max_buffers : 1000000; /* arbitrary limit on open requests */ + rcu_read_unlock(); + return mxb; } -static inline int drbd_state_is_stable(union drbd_state s) +static inline int drbd_state_is_stable(struct drbd_device *device) { + union drbd_dev_state s = device->state; /* DO NOT add a default clause, we want the compiler to warn us * for any newly introduced state we may have forgotten to add here */ @@ -2213,11 +2047,9 @@ static inline int drbd_state_is_stable(union drbd_state s) case C_VERIFY_T: case C_PAUSED_SYNC_S: case C_PAUSED_SYNC_T: - /* maybe stable, look at the disk state */ - break; - - /* no new io accepted during tansitional states - * like handshake or teardown */ + case C_AHEAD: + case C_BEHIND: + /* transitional states, IO allowed */ case C_DISCONNECTING: case C_UNCONNECTED: case C_TIMEOUT: @@ -2228,7 +2060,15 @@ static inline int drbd_state_is_stable(union drbd_state s) case C_WF_REPORT_PARAMS: case C_STARTING_SYNC_S: case C_STARTING_SYNC_T: + break; + + /* Allow IO in BM exchange states with new protocols */ case C_WF_BITMAP_S: + if (first_peer_device(device)->connection->agreed_pro_version < 96) + return 0; + break; + + /* no new io accepted in these states */ case C_WF_BITMAP_T: case C_WF_SYNC_UUID: case C_MASK: @@ -2242,12 +2082,12 @@ static inline int drbd_state_is_stable(union drbd_state s) case D_OUTDATED: case D_CONSISTENT: case D_UP_TO_DATE: + case D_FAILED: /* disk state is stable as well. */ break; - /* no new io accepted during tansitional states */ + /* no new io accepted during transitional states */ case D_ATTACHING: - case D_FAILED: case D_NEGOTIATING: case D_UNKNOWN: case D_MASK: @@ -2258,123 +2098,100 @@ static inline int drbd_state_is_stable(union drbd_state s) return 1; } -static inline int is_susp(union drbd_state s) +static inline int drbd_suspended(struct drbd_device *device) { - return s.susp || s.susp_nod || s.susp_fen; + struct drbd_resource *resource = device->resource; + + return resource->susp || resource->susp_fen || resource->susp_nod; } -static inline int __inc_ap_bio_cond(struct drbd_conf *mdev) +static inline bool may_inc_ap_bio(struct drbd_device *device) { - int mxb = drbd_get_max_buffers(mdev); + int mxb = drbd_get_max_buffers(device); - if (is_susp(mdev->state)) - return 0; - if (test_bit(SUSPEND_IO, &mdev->flags)) - return 0; + if (drbd_suspended(device)) + return false; + if (test_bit(SUSPEND_IO, &device->flags)) + return false; /* to avoid potential deadlock or bitmap corruption, * in various places, we only allow new application io * to start during "stable" states. */ /* no new io accepted when attaching or detaching the disk */ - if (!drbd_state_is_stable(mdev->state)) - return 0; + if (!drbd_state_is_stable(device)) + return false; /* since some older kernels don't have atomic_add_unless, * and we are within the spinlock anyways, we have this workaround. */ - if (atomic_read(&mdev->ap_bio_cnt) > mxb) - return 0; - if (test_bit(BITMAP_IO, &mdev->flags)) - return 0; - return 1; + if (atomic_read(&device->ap_bio_cnt) > mxb) + return false; + if (test_bit(BITMAP_IO, &device->flags)) + return false; + return true; } -/* I'd like to use wait_event_lock_irq, - * but I'm not sure when it got introduced, - * and not sure when it has 3 or 4 arguments */ -static inline void inc_ap_bio(struct drbd_conf *mdev, int count) +static inline bool inc_ap_bio_cond(struct drbd_device *device) { - /* compare with after_state_ch, - * os.conn != C_WF_BITMAP_S && ns.conn == C_WF_BITMAP_S */ - DEFINE_WAIT(wait); + bool rv = false; + + spin_lock_irq(&device->resource->req_lock); + rv = may_inc_ap_bio(device); + if (rv) + atomic_inc(&device->ap_bio_cnt); + spin_unlock_irq(&device->resource->req_lock); + + return rv; +} +static inline void inc_ap_bio(struct drbd_device *device) +{ /* we wait here * as long as the device is suspended * until the bitmap is no longer on the fly during connection - * handshake as long as we would exeed the max_buffer limit. + * handshake as long as we would exceed the max_buffer limit. * * to avoid races with the reconnect code, * we need to atomic_inc within the spinlock. */ - spin_lock_irq(&mdev->req_lock); - while (!__inc_ap_bio_cond(mdev)) { - prepare_to_wait(&mdev->misc_wait, &wait, TASK_UNINTERRUPTIBLE); - spin_unlock_irq(&mdev->req_lock); - schedule(); - finish_wait(&mdev->misc_wait, &wait); - spin_lock_irq(&mdev->req_lock); - } - atomic_add(count, &mdev->ap_bio_cnt); - spin_unlock_irq(&mdev->req_lock); + wait_event(device->misc_wait, inc_ap_bio_cond(device)); } -static inline void dec_ap_bio(struct drbd_conf *mdev) +static inline void dec_ap_bio(struct drbd_device *device) { - int mxb = drbd_get_max_buffers(mdev); - int ap_bio = atomic_dec_return(&mdev->ap_bio_cnt); + int mxb = drbd_get_max_buffers(device); + int ap_bio = atomic_dec_return(&device->ap_bio_cnt); + + D_ASSERT(device, ap_bio >= 0); + + if (ap_bio == 0 && test_bit(BITMAP_IO, &device->flags)) { + if (!test_and_set_bit(BITMAP_IO_QUEUED, &device->flags)) + drbd_queue_work(&first_peer_device(device)-> + connection->sender_work, + &device->bm_io_work.w); + } - D_ASSERT(ap_bio >= 0); /* this currently does wake_up for every dec_ap_bio! * maybe rather introduce some type of hysteresis? * e.g. (ap_bio == mxb/2 || ap_bio == 0) ? */ if (ap_bio < mxb) - wake_up(&mdev->misc_wait); - if (ap_bio == 0 && test_bit(BITMAP_IO, &mdev->flags)) { - if (!test_and_set_bit(BITMAP_IO_QUEUED, &mdev->flags)) - drbd_queue_work(&mdev->data.work, &mdev->bm_io_work.w); - } + wake_up(&device->misc_wait); } -static inline void drbd_set_ed_uuid(struct drbd_conf *mdev, u64 val) -{ - mdev->ed_uuid = val; -} - -static inline int seq_cmp(u32 a, u32 b) -{ - /* we assume wrap around at 32bit. - * for wrap around at 24bit (old atomic_t), - * we'd have to - * a <<= 8; b <<= 8; - */ - return (s32)(a) - (s32)(b); -} -#define seq_lt(a, b) (seq_cmp((a), (b)) < 0) -#define seq_gt(a, b) (seq_cmp((a), (b)) > 0) -#define seq_ge(a, b) (seq_cmp((a), (b)) >= 0) -#define seq_le(a, b) (seq_cmp((a), (b)) <= 0) -/* CAUTION: please no side effects in arguments! */ -#define seq_max(a, b) ((u32)(seq_gt((a), (b)) ? (a) : (b))) - -static inline void update_peer_seq(struct drbd_conf *mdev, unsigned int new_seq) +static inline bool verify_can_do_stop_sector(struct drbd_device *device) { - unsigned int m; - spin_lock(&mdev->peer_seq_lock); - m = seq_max(mdev->peer_seq, new_seq); - mdev->peer_seq = m; - spin_unlock(&mdev->peer_seq_lock); - if (m == new_seq) - wake_up(&mdev->seq_wait); + return first_peer_device(device)->connection->agreed_pro_version >= 97 && + first_peer_device(device)->connection->agreed_pro_version != 100; } -static inline void drbd_update_congested(struct drbd_conf *mdev) +static inline int drbd_set_ed_uuid(struct drbd_device *device, u64 val) { - struct sock *sk = mdev->data.socket->sk; - if (sk->sk_wmem_queued > sk->sk_sndbuf * 4 / 5) - set_bit(NET_CONGESTED, &mdev->flags); + int changed = device->ed_uuid != val; + device->ed_uuid = val; + return changed; } -static inline int drbd_queue_order_type(struct drbd_conf *mdev) +static inline int drbd_queue_order_type(struct drbd_device *device) { /* sorry, we currently have no working implementation * of distributed TCQ stuff */ @@ -2384,32 +2201,29 @@ static inline int drbd_queue_order_type(struct drbd_conf *mdev) return QUEUE_ORDERED_NONE; } -static inline void drbd_blk_run_queue(struct request_queue *q) +static inline void drbd_md_flush(struct drbd_device *device) { - if (q && q->unplug_fn) - q->unplug_fn(q); -} + int r; -static inline void drbd_kick_lo(struct drbd_conf *mdev) -{ - if (get_ldev(mdev)) { - drbd_blk_run_queue(bdev_get_queue(mdev->ldev->backing_bdev)); - put_ldev(mdev); + if (device->ldev == NULL) { + drbd_warn(device, "device->ldev == NULL in drbd_md_flush\n"); + return; } -} -static inline void drbd_md_flush(struct drbd_conf *mdev) -{ - int r; - - if (test_bit(MD_NO_FUA, &mdev->flags)) + if (test_bit(MD_NO_FUA, &device->flags)) return; - r = blkdev_issue_flush(mdev->ldev->md_bdev, GFP_KERNEL, NULL); + r = blkdev_issue_flush(device->ldev->md_bdev, GFP_NOIO, NULL); if (r) { - set_bit(MD_NO_FUA, &mdev->flags); - dev_err(DEV, "meta data flush failed with status %d, disabling md-flushes\n", r); + set_bit(MD_NO_FUA, &device->flags); + drbd_err(device, "meta data flush failed with status %d, disabling md-flushes\n", r); } } +static inline struct drbd_connection *first_connection(struct drbd_resource *resource) +{ + return list_first_entry_or_null(&resource->connections, + struct drbd_connection, connections); +} + #endif |