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/*
  Copyright (c) 2008-2012 Red Hat, Inc. <http://www.redhat.com>
  This file is part of GlusterFS.

  This file is licensed to you under your choice of the GNU Lesser
  General Public License, version 3 or any later version (LGPLv3 or
  later), or the GNU General Public License, version 2 (GPLv2), in all
  cases as published by the Free Software Foundation.
*/


#ifndef __AFR_H__
#define __AFR_H__

#include "call-stub.h"
#include "compat-errno.h"
#include "afr-mem-types.h"

#include "libxlator.h"
#include "timer.h"
#include "syncop.h"

#include "afr-self-heald.h"
#include "afr-messages.h"

#define AFR_XATTR_PREFIX "trusted.afr"
#define AFR_PATHINFO_HEADER "REPLICATE:"
#define AFR_SH_READDIR_SIZE_KEY "self-heal-readdir-size"
#define AFR_SH_DATA_DOMAIN_FMT "%s:self-heal"
#define AFR_DIRTY_DEFAULT AFR_XATTR_PREFIX ".dirty"
#define AFR_DIRTY (((afr_private_t *) (THIS->private))->afr_dirty)

#define AFR_LOCKEE_COUNT_MAX    3
#define AFR_DOM_COUNT_MAX    3
#define AFR_NUM_CHANGE_LOGS            3 /*data + metadata + entry*/
#define AFR_DEFAULT_SPB_CHOICE_TIMEOUT 300 /*in seconds*/

#define ARBITER_BRICK_INDEX 2

typedef int (*afr_lock_cbk_t) (call_frame_t *frame, xlator_t *this);

typedef int (*afr_read_txn_wind_t) (call_frame_t *frame, xlator_t *this, int subvol);

typedef int (*afr_inode_refresh_cbk_t) (call_frame_t *frame, xlator_t *this, int err);

typedef int (*afr_changelog_resume_t) (call_frame_t *frame, xlator_t *this);

#define alloca0(size) ({void *__ptr; __ptr = alloca(size); memset(__ptr, 0, size); __ptr;})
#define AFR_COUNT(array,max) ({int __i; int __res = 0; for (__i = 0; __i < max; __i++) if (array[__i]) __res++; __res;})
#define AFR_INTERSECT(dst,src1,src2,max) ({int __i; for (__i = 0; __i < max; __i++) dst[__i] = src1[__i] && src2[__i];})
#define AFR_CMP(a1,a2,len) ({int __cmp = 0; int __i; for (__i = 0; __i < len; __i++) if (a1[__i] != a2[__i]) { __cmp = 1; break;} __cmp;})
#define AFR_IS_ARBITER_BRICK(priv, index) ((priv->arbiter_count == 1) && (index == ARBITER_BRICK_INDEX))
typedef struct _afr_private {
        gf_lock_t lock;               /* to guard access to child_count, etc */
        unsigned int child_count;     /* total number of children   */
        unsigned int arbiter_count;   /*subset of child_count.
                                        Has to be 0 or 1.*/

        xlator_t **children;

        inode_t *root_inode;

        unsigned char *child_up;

        char **pending_key;

        char         *data_self_heal;              /* on/off/open */
        char *       data_self_heal_algorithm;    /* name of algorithm */
        unsigned int data_self_heal_window_size;  /* max number of pipelined
                                                     read/writes */

        struct list_head heal_waiting; /*queue for files that need heal*/
        uint32_t  heal_wait_qlen; /*configurable queue length for heal_waiting*/
        int32_t  heal_waiters; /* No. of elements currently in wait queue.*/

        struct list_head healing;/* queue for files that are undergoing
                                    background heal*/
        uint32_t  background_self_heal_count;/*configurable queue length for
                                               healing queue*/
        int32_t  healers;/* No. of elements currently undergoing background
                          heal*/

        gf_boolean_t metadata_self_heal;   /* on/off */
        gf_boolean_t entry_self_heal;      /* on/off */

        gf_boolean_t data_change_log;       /* on/off */
        gf_boolean_t metadata_change_log;   /* on/off */
        gf_boolean_t entry_change_log;      /* on/off */

	gf_boolean_t metadata_splitbrain_forced_heal; /* on/off */
        int read_child;               /* read-subvolume */
        unsigned int hash_mode;       /* for when read_child is not set */
        int favorite_child;  /* subvolume to be preferred in resolving
                                         split-brain cases */

        gf_boolean_t inodelk_trace;
        gf_boolean_t entrylk_trace;

        unsigned int wait_count;      /* # of servers to wait for success */

        uint64_t up_count;      /* number of CHILD_UPs we have seen */
        uint64_t down_count;    /* number of CHILD_DOWNs we have seen */

        gf_boolean_t      optimistic_change_log;
        gf_boolean_t      eager_lock;
        gf_boolean_t      pre_op_compat;      /* on/off */
	uint32_t          post_op_delay_secs;
        unsigned int      quorum_count;
        gf_boolean_t      quorum_reads;

        char                   vol_uuid[UUID_SIZE + 1];
        int32_t                *last_event;

	/* @event_generation: Keeps count of number of events received which can
	   potentially impact consistency decisions. The events are CHILD_UP
	   and CHILD_DOWN, when we have to recalculate the freshness/staleness
	   of copies to detect if changes had happened while the other server
	   was down. CHILD_DOWN and CHILD_UP can also be received on network
	   disconnect/reconnects and not necessarily server going down/up.
	   Recalculating freshness/staleness on network events is equally
	   important as we might have had a network split brain.
	*/
	uint32_t               event_generation;

        gf_boolean_t           choose_local;
        gf_boolean_t           did_discovery;
        uint64_t               sh_readdir_size;
        gf_boolean_t           ensure_durability;
        char                   *sh_domain;
	char                   *afr_dirty;

	afr_self_heald_t       shd;

        gf_boolean_t           consistent_metadata;
        uint64_t               spb_choice_timeout;
        gf_boolean_t           need_heal;

	/* pump dependencies */
	void                   *pump_private;
	gf_boolean_t           use_afr_in_pump;

} afr_private_t;


typedef enum {
        AFR_DATA_TRANSACTION,          /* truncate, write, ... */
        AFR_METADATA_TRANSACTION,      /* chmod, chown, ... */
        AFR_ENTRY_TRANSACTION,         /* create, rmdir, ... */
        AFR_ENTRY_RENAME_TRANSACTION,  /* rename */
} afr_transaction_type;

typedef enum {
        AFR_TRANSACTION_LK,
        AFR_SELFHEAL_LK,
} transaction_lk_type_t;

typedef enum {
        AFR_LOCK_OP,
        AFR_UNLOCK_OP,
} afr_lock_op_type_t;

typedef enum {
        AFR_DATA_SELF_HEAL_LK,
        AFR_METADATA_SELF_HEAL_LK,
        AFR_ENTRY_SELF_HEAL_LK,
}selfheal_lk_type_t;

typedef enum {
        AFR_INODELK_TRANSACTION,
        AFR_INODELK_NB_TRANSACTION,
        AFR_ENTRYLK_TRANSACTION,
        AFR_ENTRYLK_NB_TRANSACTION,
        AFR_INODELK_SELFHEAL,
        AFR_INODELK_NB_SELFHEAL,
        AFR_ENTRYLK_SELFHEAL,
        AFR_ENTRYLK_NB_SELFHEAL,
} afr_lock_call_type_t;

/*
  xattr format: trusted.afr.volume = [x y z]
  x - data pending
  y - metadata pending
  z - entry pending
*/

static inline int
afr_index_for_transaction_type (afr_transaction_type type)
{
        switch (type) {

        case AFR_DATA_TRANSACTION:
                return 0;

        case AFR_METADATA_TRANSACTION:
                return 1;

        case AFR_ENTRY_TRANSACTION:
        case AFR_ENTRY_RENAME_TRANSACTION:
                return 2;
        }

        return -1;  /* make gcc happy */
}

static inline int
afr_index_from_ia_type (ia_type_t type)
{
        switch (type) {
        case IA_IFDIR:
                return afr_index_for_transaction_type (AFR_ENTRY_TRANSACTION);
        case IA_IFREG:
                return afr_index_for_transaction_type (AFR_DATA_TRANSACTION);
        default: return -1;
        }
}

typedef struct {
        loc_t                   loc;
        char                    *basename;
        unsigned char           *locked_nodes;
        int                     locked_count;

} afr_entry_lockee_t;

int
afr_entry_lockee_cmp (const void *l1, const void *l2);

typedef struct {
        char    *domain; /* Domain on which inodelk is taken */
        struct gf_flock flock;
        unsigned char *locked_nodes;
        int32_t lock_count;
} afr_inodelk_t;

typedef struct {
        loc_t *lk_loc;

        int                     lockee_count;
        afr_entry_lockee_t      lockee[AFR_LOCKEE_COUNT_MAX];

        afr_inodelk_t       inodelk[AFR_DOM_COUNT_MAX];
        const char *lk_basename;
        const char *lower_basename;
        const char *higher_basename;
        char lower_locked;
        char higher_locked;

        unsigned char *locked_nodes;
        unsigned char *lower_locked_nodes;

        selfheal_lk_type_t selfheal_lk_type;
        transaction_lk_type_t transaction_lk_type;

        int32_t lock_count;
        int32_t entrylk_lock_count;

        uint64_t lock_number;
        int32_t lk_call_count;
        int32_t lk_expected_count;
        int32_t lk_attempted_count;

        int32_t lock_op_ret;
        int32_t lock_op_errno;
        afr_lock_cbk_t lock_cbk;
        char *domain; /* Domain on which inode/entry lock/unlock in progress.*/
} afr_internal_lock_t;

struct afr_reply {
	int	valid;
	int32_t	op_ret;
	int32_t	op_errno;
	dict_t *xattr;/*For xattrop*/
	dict_t *xdata;
	struct iatt poststat;
	struct iatt postparent;
	struct iatt prestat;
	struct iatt preparent;
	struct iatt preparent2;
	struct iatt postparent2;
        /* For rchecksum */
	uint8_t checksum[MD5_DIGEST_LENGTH];
        gf_boolean_t buf_has_zeroes;
        /* For lookup */
        int8_t need_heal;
};

typedef enum {
        AFR_FD_NOT_OPENED,
        AFR_FD_OPENED,
        AFR_FD_OPENING
} afr_fd_open_status_t;

typedef struct {
        unsigned int *pre_op_done[AFR_NUM_CHANGE_LOGS];
	int inherited[AFR_NUM_CHANGE_LOGS];
	int on_disk[AFR_NUM_CHANGE_LOGS];
        afr_fd_open_status_t *opened_on; /* which subvolumes the fd is open on */

        unsigned int *lock_piggyback;
        unsigned int *lock_acquired;

        int flags;

	/* used for delayed-post-op optimization */
	pthread_mutex_t    delay_lock;
	gf_timer_t        *delay_timer;
	call_frame_t      *delay_frame;

	/* set if any write on this fd was a non stable write
	   (i.e, without O_SYNC or O_DSYNC)
	*/
	gf_boolean_t      witnessed_unstable_write;

	/* @open_fd_count:
	   Number of open FDs queried from the server, as queried through
	   xdata in FOPs. Currently, used to decide if eager-locking must be
	   temporarily disabled.
	*/
        uint32_t        open_fd_count;


	/* list of frames currently in progress */
	struct list_head  eager_locked;

	/* the subvolume on which the latest sequence of readdirs (starting
	   at offset 0) has begun. Till the next readdir request with 0 offset
	   arrives, we continue to read off this subvol.
	*/
	int readdir_subvol;
} afr_fd_ctx_t;


typedef struct _afr_local {
	glusterfs_fop_t  op;
        unsigned int call_count;

	/* @event_generation: copy of priv->event_generation taken at the
	   time of starting the transaction. The copy is made so that we
	   have a stable value through the various phases of the transaction.
	*/
	unsigned int event_generation;

        uint32_t     open_fd_count;
        gf_boolean_t update_open_fd_count;

	gf_lkowner_t  saved_lk_owner;

        int32_t op_ret;
        int32_t op_errno;

        int32_t **pending;

	int dirty[AFR_NUM_CHANGE_LOGS];

        loc_t loc;
        loc_t newloc;

        fd_t *fd;
	afr_fd_ctx_t *fd_ctx;

	/* @child_up: copy of priv->child_up taken at the time of transaction
	   start. The copy is taken so that we have a stable child_up array
	   through the phases of the transaction as priv->child_up[i] can keep
	   changing through time.
	*/
        unsigned char *child_up;

	/* @read_attempted:
	   array of flags representing subvolumes where read operations of
	   the read transaction have already been attempted. The array is
	   first pre-filled with down subvolumes, and as reads are performed
	   on other subvolumes, those are set as well. This way if the read
	   operation fails we do not retry on that subvolume again.
	*/
	unsigned char *read_attempted;

	/* @readfn:

	   pointer to function which will perform the read operation on a given
	   subvolume. Used in read transactions.
	*/

	afr_read_txn_wind_t readfn;

	/* @refreshed:

	   the inode was "refreshed" (i.e, pending xattrs from all subvols
	   freshly inspected and inode ctx updated accordingly) as part of
	   this transaction already.
	*/
	gf_boolean_t refreshed;

	/* @inode:

	   the inode on which the read txn is performed on. ref'ed and copied
	   from either fd->inode or loc.inode
	*/

	inode_t *inode;

	/* @parent[2]:

	   parent inode[s] on which directory transactions are performed.
	*/

	inode_t *parent;
	inode_t *parent2;

	/* @readable:

	   array of flags representing servers from which a read can be
	   performed. This is the output of afr_inode_refresh()
	*/
	unsigned char *readable;

	afr_inode_refresh_cbk_t refreshfn;

	/* @refreshinode:

	   Inode currently getting refreshed.
	*/
	inode_t *refreshinode;

	/*
	  @pre_op_compat:

	  compatibility mode of pre-op. send a separate pre-op and
	  op operations as part of transaction, rather than combining
	*/

	gf_boolean_t pre_op_compat;

        dict_t  *xattr_req;

        afr_internal_lock_t internal_lock;

        dict_t  *dict;

        int      optimistic_change_log;
	gf_boolean_t      delayed_post_op;

	/* Is the current writev() going to perform a stable write?
	   i.e, is fd->flags or @flags writev param have O_SYNC or
	   O_DSYNC?
	*/
	gf_boolean_t      stable_write;

	/* This write appended to the file. Nnot necessarily O_APPEND,
	   just means the offset of write was at the end of file.
	*/
	gf_boolean_t      append_write;

        /*
          This struct contains the arguments for the "continuation"
          (scheme-like) of fops
        */

        struct {
                struct {
                        gf_boolean_t needs_fresh_lookup;
                        uuid_t gfid_req;
                } lookup;

                struct {
                        unsigned char buf_set;
                        struct statvfs buf;
                } statfs;

                struct {
                        int32_t flags;
                } open;

                struct {
                        int32_t cmd;
                        struct gf_flock user_flock;
                        struct gf_flock ret_flock;
                        unsigned char *locked_nodes;
                } lk;

                /* inode read */

                struct {
                        int32_t mask;
                        int last_index;  /* index of the child we tried previously */
                } access;

                struct {
                        int last_index;
                } stat;

                struct {
                        int last_index;
                } fstat;

                struct {
                        size_t size;
                        int last_index;
                } readlink;

                struct {
                        char *name;
                        int last_index;
                        long xattr_len;
                } getxattr;

                struct {
                        size_t size;
                        off_t offset;
                        int last_index;
                        uint32_t flags;
                } readv;

                /* dir read */

                struct {
                        int success_count;
                        int32_t op_ret;
                        int32_t op_errno;

                        uint32_t *checksum;
                } opendir;

                struct {
                        int32_t op_ret;
                        int32_t op_errno;
                        size_t size;
                        off_t offset;
                        dict_t *dict;
                        gf_boolean_t failed;
                        int last_index;
                } readdir;
                /* inode write */

                struct {
                        struct iatt prebuf;
                        struct iatt postbuf;
                } inode_wfop; //common structure for all inode-write-fops

                struct {
                        int32_t op_ret;

                        struct iovec *vector;
                        struct iobref *iobref;
                        int32_t count;
                        off_t offset;
                        uint32_t flags;
                } writev;

                struct {