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Diffstat (limited to 'fs/dlm/dlm_internal.h')
| -rw-r--r-- | fs/dlm/dlm_internal.h | 829 |
1 files changed, 829 insertions, 0 deletions
diff --git a/fs/dlm/dlm_internal.h b/fs/dlm/dlm_internal.h new file mode 100644 index 0000000000..dfc444dad3 --- /dev/null +++ b/fs/dlm/dlm_internal.h @@ -0,0 +1,829 @@ +/* SPDX-License-Identifier: GPL-2.0-only */ +/****************************************************************************** +******************************************************************************* +** +** Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. +** Copyright (C) 2004-2011 Red Hat, Inc. All rights reserved. +** +** +******************************************************************************* +******************************************************************************/ + +#ifndef __DLM_INTERNAL_DOT_H__ +#define __DLM_INTERNAL_DOT_H__ + +/* + * This is the main header file to be included in each DLM source file. + */ + +#include <linux/slab.h> +#include <linux/sched.h> +#include <linux/types.h> +#include <linux/ctype.h> +#include <linux/spinlock.h> +#include <linux/vmalloc.h> +#include <linux/list.h> +#include <linux/errno.h> +#include <linux/random.h> +#include <linux/delay.h> +#include <linux/socket.h> +#include <linux/kthread.h> +#include <linux/kobject.h> +#include <linux/kref.h> +#include <linux/kernel.h> +#include <linux/jhash.h> +#include <linux/miscdevice.h> +#include <linux/mutex.h> +#include <linux/idr.h> +#include <linux/ratelimit.h> +#include <linux/uaccess.h> + +#include <linux/dlm.h> +#include "config.h" + +struct dlm_ls; +struct dlm_lkb; +struct dlm_rsb; +struct dlm_member; +struct dlm_rsbtable; +struct dlm_recover; +struct dlm_header; +struct dlm_message; +struct dlm_rcom; +struct dlm_mhandle; +struct dlm_msg; + +#define log_print(fmt, args...) \ + printk(KERN_ERR "dlm: "fmt"\n" , ##args) +#define log_print_ratelimited(fmt, args...) \ + printk_ratelimited(KERN_ERR "dlm: "fmt"\n", ##args) +#define log_error(ls, fmt, args...) \ + printk(KERN_ERR "dlm: %s: " fmt "\n", (ls)->ls_name , ##args) + +#define log_rinfo(ls, fmt, args...) \ +do { \ + if (dlm_config.ci_log_info) \ + printk(KERN_INFO "dlm: %s: " fmt "\n", \ + (ls)->ls_name, ##args); \ + else if (dlm_config.ci_log_debug) \ + printk(KERN_DEBUG "dlm: %s: " fmt "\n", \ + (ls)->ls_name , ##args); \ +} while (0) + +#define log_debug(ls, fmt, args...) \ +do { \ + if (dlm_config.ci_log_debug) \ + printk(KERN_DEBUG "dlm: %s: " fmt "\n", \ + (ls)->ls_name , ##args); \ +} while (0) + +#define log_limit(ls, fmt, args...) \ +do { \ + if (dlm_config.ci_log_debug) \ + printk_ratelimited(KERN_DEBUG "dlm: %s: " fmt "\n", \ + (ls)->ls_name , ##args); \ +} while (0) + +#define DLM_ASSERT(x, do) \ +{ \ + if (!(x)) \ + { \ + printk(KERN_ERR "\nDLM: Assertion failed on line %d of file %s\n" \ + "DLM: assertion: \"%s\"\n" \ + "DLM: time = %lu\n", \ + __LINE__, __FILE__, #x, jiffies); \ + {do} \ + printk("\n"); \ + panic("DLM: Record message above and reboot.\n"); \ + } \ +} + + +#define DLM_RTF_SHRINK_BIT 0 + +struct dlm_rsbtable { + struct rb_root keep; + struct rb_root toss; + spinlock_t lock; + unsigned long flags; +}; + + +/* + * Lockspace member (per node in a ls) + */ + +struct dlm_member { + struct list_head list; + int nodeid; + int weight; + int slot; + int slot_prev; + int comm_seq; + uint32_t generation; +}; + +/* + * Save and manage recovery state for a lockspace. + */ + +struct dlm_recover { + struct list_head list; + struct dlm_config_node *nodes; + int nodes_count; + uint64_t seq; +}; + +/* + * Pass input args to second stage locking function. + */ + +struct dlm_args { + uint32_t flags; + void (*astfn) (void *astparam); + void *astparam; + void (*bastfn) (void *astparam, int mode); + int mode; + struct dlm_lksb *lksb; +}; + + +/* + * Lock block + * + * A lock can be one of three types: + * + * local copy lock is mastered locally + * (lkb_nodeid is zero and DLM_LKF_MSTCPY is not set) + * process copy lock is mastered on a remote node + * (lkb_nodeid is non-zero and DLM_LKF_MSTCPY is not set) + * master copy master node's copy of a lock owned by remote node + * (lkb_nodeid is non-zero and DLM_LKF_MSTCPY is set) + * + * lkb_exflags: a copy of the most recent flags arg provided to dlm_lock or + * dlm_unlock. The dlm does not modify these or use any private flags in + * this field; it only contains DLM_LKF_ flags from dlm.h. These flags + * are sent as-is to the remote master when the lock is remote. + * + * lkb_flags: internal dlm flags (DLM_IFL_ prefix) from dlm_internal.h. + * Some internal flags are shared between the master and process nodes; + * these shared flags are kept in the lower two bytes. One of these + * flags set on the master copy will be propagated to the process copy + * and v.v. Other internal flags are private to the master or process + * node (e.g. DLM_IFL_MSTCPY). These are kept in the high two bytes. + * + * lkb_sbflags: status block flags. These flags are copied directly into + * the caller's lksb.sb_flags prior to the dlm_lock/dlm_unlock completion + * ast. All defined in dlm.h with DLM_SBF_ prefix. + * + * lkb_status: the lock status indicates which rsb queue the lock is + * on, grant, convert, or wait. DLM_LKSTS_ WAITING/GRANTED/CONVERT + * + * lkb_wait_type: the dlm message type (DLM_MSG_ prefix) for which a + * reply is needed. Only set when the lkb is on the lockspace waiters + * list awaiting a reply from a remote node. + * + * lkb_nodeid: when the lkb is a local copy, nodeid is 0; when the lkb + * is a master copy, nodeid specifies the remote lock holder, when the + * lkb is a process copy, the nodeid specifies the lock master. + */ + +/* lkb_status */ + +#define DLM_LKSTS_WAITING 1 +#define DLM_LKSTS_GRANTED 2 +#define DLM_LKSTS_CONVERT 3 + +/* lkb_iflags */ + +#define DLM_IFL_MSTCPY_BIT 16 +#define __DLM_IFL_MIN_BIT DLM_IFL_MSTCPY_BIT +#define DLM_IFL_RESEND_BIT 17 +#define DLM_IFL_DEAD_BIT 18 +#define DLM_IFL_OVERLAP_UNLOCK_BIT 19 +#define DLM_IFL_OVERLAP_CANCEL_BIT 20 +#define DLM_IFL_ENDOFLIFE_BIT 21 +#define DLM_IFL_DEADLOCK_CANCEL_BIT 24 +#define DLM_IFL_CB_PENDING_BIT 25 +#define __DLM_IFL_MAX_BIT DLM_IFL_CB_PENDING_BIT + +/* lkb_dflags */ + +#define DLM_DFL_USER_BIT 0 +#define __DLM_DFL_MIN_BIT DLM_DFL_USER_BIT +#define DLM_DFL_ORPHAN_BIT 1 +#define __DLM_DFL_MAX_BIT DLM_DFL_ORPHAN_BIT + +#define DLM_CB_CAST 0x00000001 +#define DLM_CB_BAST 0x00000002 + +struct dlm_callback { + uint32_t flags; /* DLM_CBF_ */ + int sb_status; /* copy to lksb status */ + uint8_t sb_flags; /* copy to lksb flags */ + int8_t mode; /* rq mode of bast, gr mode of cast */ + + struct list_head list; + struct kref ref; +}; + +struct dlm_lkb { + struct dlm_rsb *lkb_resource; /* the rsb */ + struct kref lkb_ref; + int lkb_nodeid; /* copied from rsb */ + int lkb_ownpid; /* pid of lock owner */ + uint32_t lkb_id; /* our lock ID */ + uint32_t lkb_remid; /* lock ID on remote partner */ + uint32_t lkb_exflags; /* external flags from caller */ + unsigned long lkb_sbflags; /* lksb flags */ + unsigned long lkb_dflags; /* distributed flags */ + unsigned long lkb_iflags; /* internal flags */ + uint32_t lkb_lvbseq; /* lvb sequence number */ + + int8_t lkb_status; /* granted, waiting, convert */ + int8_t lkb_rqmode; /* requested lock mode */ + int8_t lkb_grmode; /* granted lock mode */ + int8_t lkb_highbast; /* highest mode bast sent for */ + + int8_t lkb_wait_type; /* type of reply waiting for */ + atomic_t lkb_wait_count; + int lkb_wait_nodeid; /* for debugging */ + + struct list_head lkb_statequeue; /* rsb g/c/w list */ + struct list_head lkb_rsb_lookup; /* waiting for rsb lookup */ + struct list_head lkb_wait_reply; /* waiting for remote reply */ + struct list_head lkb_ownqueue; /* list of locks for a process */ + ktime_t lkb_timestamp; + + spinlock_t lkb_cb_lock; + struct work_struct lkb_cb_work; + struct list_head lkb_cb_list; /* for ls_cb_delay or proc->asts */ + struct list_head lkb_callbacks; + struct dlm_callback *lkb_last_cast; + struct dlm_callback *lkb_last_cb; + int lkb_last_bast_mode; + ktime_t lkb_last_cast_time; /* for debugging */ + ktime_t lkb_last_bast_time; /* for debugging */ + + uint64_t lkb_recover_seq; /* from ls_recover_seq */ + + char *lkb_lvbptr; + struct dlm_lksb *lkb_lksb; /* caller's status block */ + void (*lkb_astfn) (void *astparam); + void (*lkb_bastfn) (void *astparam, int mode); + union { + void *lkb_astparam; /* caller's ast arg */ + struct dlm_user_args *lkb_ua; + }; +}; + +/* + * res_master_nodeid is "normal": 0 is unset/invalid, non-zero is the real + * nodeid, even when nodeid is our_nodeid. + * + * res_nodeid is "odd": -1 is unset/invalid, zero means our_nodeid, + * greater than zero when another nodeid. + * + * (TODO: remove res_nodeid and only use res_master_nodeid) + */ + +struct dlm_rsb { + struct dlm_ls *res_ls; /* the lockspace */ + struct kref res_ref; + struct mutex res_mutex; + unsigned long res_flags; + int res_length; /* length of rsb name */ + int res_nodeid; + int res_master_nodeid; + int res_dir_nodeid; + int res_id; /* for ls_recover_idr */ + uint32_t res_lvbseq; + uint32_t res_hash; + uint32_t res_bucket; /* rsbtbl */ + unsigned long res_toss_time; + uint32_t res_first_lkid; + struct list_head res_lookup; /* lkbs waiting on first */ + union { + struct list_head res_hashchain; + struct rb_node res_hashnode; /* rsbtbl */ + }; + struct list_head res_grantqueue; + struct list_head res_convertqueue; + struct list_head res_waitqueue; + + struct list_head res_root_list; /* used for recovery */ + struct list_head res_recover_list; /* used for recovery */ + int res_recover_locks_count; + + char *res_lvbptr; + char res_name[DLM_RESNAME_MAXLEN+1]; +}; + +/* dlm_master_lookup() flags */ + +#define DLM_LU_RECOVER_DIR 1 +#define DLM_LU_RECOVER_MASTER 2 + +/* dlm_master_lookup() results */ + +#define DLM_LU_MATCH 1 +#define DLM_LU_ADD 2 + +/* find_rsb() flags */ + +#define R_REQUEST 0x00000001 +#define R_RECEIVE_REQUEST 0x00000002 +#define R_RECEIVE_RECOVER 0x00000004 + +/* rsb_flags */ + +enum rsb_flags { + RSB_MASTER_UNCERTAIN, + RSB_VALNOTVALID, + RSB_VALNOTVALID_PREV, + RSB_NEW_MASTER, + RSB_NEW_MASTER2, + RSB_RECOVER_CONVERT, + RSB_RECOVER_GRANT, + RSB_RECOVER_LVB_INVAL, +}; + +static inline void rsb_set_flag(struct dlm_rsb *r, enum rsb_flags flag) +{ + __set_bit(flag, &r->res_flags); +} + +static inline void rsb_clear_flag(struct dlm_rsb *r, enum rsb_flags flag) +{ + __clear_bit(flag, &r->res_flags); +} + +static inline int rsb_flag(struct dlm_rsb *r, enum rsb_flags flag) +{ + return test_bit(flag, &r->res_flags); +} + + +/* dlm_header is first element of all structs sent between nodes */ + +#define DLM_HEADER_MAJOR 0x00030000 +#define DLM_HEADER_MINOR 0x00000002 + +#define DLM_VERSION_3_1 0x00030001 +#define DLM_VERSION_3_2 0x00030002 + +#define DLM_HEADER_SLOTS 0x00000001 + +#define DLM_MSG 1 +#define DLM_RCOM 2 +#define DLM_OPTS 3 +#define DLM_ACK 4 +#define DLM_FIN 5 + +struct dlm_header { + __le32 h_version; + union { + /* for DLM_MSG and DLM_RCOM */ + __le32 h_lockspace; + /* for DLM_ACK and DLM_OPTS */ + __le32 h_seq; + } u; + __le32 h_nodeid; /* nodeid of sender */ + __le16 h_length; + uint8_t h_cmd; /* DLM_MSG, DLM_RCOM */ + uint8_t h_pad; +}; + +#define DLM_MSG_REQUEST 1 +#define DLM_MSG_CONVERT 2 +#define DLM_MSG_UNLOCK 3 +#define DLM_MSG_CANCEL 4 +#define DLM_MSG_REQUEST_REPLY 5 +#define DLM_MSG_CONVERT_REPLY 6 +#define DLM_MSG_UNLOCK_REPLY 7 +#define DLM_MSG_CANCEL_REPLY 8 +#define DLM_MSG_GRANT 9 +#define DLM_MSG_BAST 10 +#define DLM_MSG_LOOKUP 11 +#define DLM_MSG_REMOVE 12 +#define DLM_MSG_LOOKUP_REPLY 13 +#define DLM_MSG_PURGE 14 + +struct dlm_message { + struct dlm_header m_header; + __le32 m_type; /* DLM_MSG_ */ + __le32 m_nodeid; + __le32 m_pid; + __le32 m_lkid; /* lkid on sender */ + __le32 m_remid; /* lkid on receiver */ + __le32 m_parent_lkid; + __le32 m_parent_remid; + __le32 m_exflags; + __le32 m_sbflags; + __le32 m_flags; + __le32 m_lvbseq; + __le32 m_hash; + __le32 m_status; + __le32 m_grmode; + __le32 m_rqmode; + __le32 m_bastmode; + __le32 m_asts; + __le32 m_result; /* 0 or -EXXX */ + char m_extra[]; /* name or lvb */ +}; + + +#define DLM_RS_NODES 0x00000001 +#define DLM_RS_NODES_ALL 0x00000002 +#define DLM_RS_DIR 0x00000004 +#define DLM_RS_DIR_ALL 0x00000008 +#define DLM_RS_LOCKS 0x00000010 +#define DLM_RS_LOCKS_ALL 0x00000020 +#define DLM_RS_DONE 0x00000040 +#define DLM_RS_DONE_ALL 0x00000080 + +#define DLM_RCOM_STATUS 1 +#define DLM_RCOM_NAMES 2 +#define DLM_RCOM_LOOKUP 3 +#define DLM_RCOM_LOCK 4 +#define DLM_RCOM_STATUS_REPLY 5 +#define DLM_RCOM_NAMES_REPLY 6 +#define DLM_RCOM_LOOKUP_REPLY 7 +#define DLM_RCOM_LOCK_REPLY 8 + +struct dlm_rcom { + struct dlm_header rc_header; + __le32 rc_type; /* DLM_RCOM_ */ + __le32 rc_result; /* multi-purpose */ + __le64 rc_id; /* match reply with request */ + __le64 rc_seq; /* sender's ls_recover_seq */ + __le64 rc_seq_reply; /* remote ls_recover_seq */ + char rc_buf[]; +}; + +struct dlm_opt_header { + __le16 t_type; + __le16 t_length; + __le32 t_pad; + /* need to be 8 byte aligned */ + char t_value[]; +}; + +/* encapsulation header */ +struct dlm_opts { + struct dlm_header o_header; + uint8_t o_nextcmd; + uint8_t o_pad; + __le16 o_optlen; + __le32 o_pad2; + char o_opts[]; +}; + +union dlm_packet { + struct dlm_header header; /* common to other two */ + struct dlm_message message; + struct dlm_rcom rcom; + struct dlm_opts opts; +}; + +#define DLM_RSF_NEED_SLOTS 0x00000001 + +/* RCOM_STATUS data */ +struct rcom_status { + __le32 rs_flags; + __le32 rs_unused1; + __le64 rs_unused2; +}; + +/* RCOM_STATUS_REPLY data */ +struct rcom_config { + __le32 rf_lvblen; + __le32 rf_lsflags; + + /* DLM_HEADER_SLOTS adds: */ + __le32 rf_flags; + __le16 rf_our_slot; + __le16 rf_num_slots; + __le32 rf_generation; + __le32 rf_unused1; + __le64 rf_unused2; +}; + +struct rcom_slot { + __le32 ro_nodeid; + __le16 ro_slot; + __le16 ro_unused1; + __le64 ro_unused2; +}; + +struct rcom_lock { + __le32 rl_ownpid; + __le32 rl_lkid; + __le32 rl_remid; + __le32 rl_parent_lkid; + __le32 rl_parent_remid; + __le32 rl_exflags; + __le32 rl_flags; + __le32 rl_lvbseq; + __le32 rl_result; + int8_t rl_rqmode; + int8_t rl_grmode; + int8_t rl_status; + int8_t rl_asts; + __le16 rl_wait_type; + __le16 rl_namelen; + char rl_name[DLM_RESNAME_MAXLEN]; + char rl_lvb[]; +}; + +/* + * The max number of resources per rsbtbl bucket that shrink will attempt + * to remove in each iteration. + */ + +#define DLM_REMOVE_NAMES_MAX 8 + +struct dlm_ls { + struct list_head ls_list; /* list of lockspaces */ + dlm_lockspace_t *ls_local_handle; + uint32_t ls_global_id; /* global unique lockspace ID */ + uint32_t ls_generation; + uint32_t ls_exflags; + int ls_lvblen; + atomic_t ls_count; /* refcount of processes in + the dlm using this ls */ + wait_queue_head_t ls_count_wait; + int ls_create_count; /* create/release refcount */ + unsigned long ls_flags; /* LSFL_ */ + unsigned long ls_scan_time; + struct kobject ls_kobj; + + struct idr ls_lkbidr; + spinlock_t ls_lkbidr_spin; + + struct dlm_rsbtable *ls_rsbtbl; + uint32_t ls_rsbtbl_size; + + struct mutex ls_waiters_mutex; + struct list_head ls_waiters; /* lkbs needing a reply */ + + struct mutex ls_orphans_mutex; + struct list_head ls_orphans; + + spinlock_t ls_new_rsb_spin; + int ls_new_rsb_count; + struct list_head ls_new_rsb; /* new rsb structs */ + + char *ls_remove_names[DLM_REMOVE_NAMES_MAX]; + int ls_remove_lens[DLM_REMOVE_NAMES_MAX]; + + struct list_head ls_nodes; /* current nodes in ls */ + struct list_head ls_nodes_gone; /* dead node list, recovery */ + int ls_num_nodes; /* number of nodes in ls */ + int ls_low_nodeid; + int ls_total_weight; + int *ls_node_array; + + int ls_slot; + int ls_num_slots; + int ls_slots_size; + struct dlm_slot *ls_slots; + + struct dlm_rsb ls_local_rsb; /* for returning errors */ + struct dlm_lkb ls_local_lkb; /* for returning errors */ + struct dlm_message ls_local_ms; /* for faking a reply */ + + struct dentry *ls_debug_rsb_dentry; /* debugfs */ + struct dentry *ls_debug_waiters_dentry; /* debugfs */ + struct dentry *ls_debug_locks_dentry; /* debugfs */ + struct dentry *ls_debug_all_dentry; /* debugfs */ + struct dentry *ls_debug_toss_dentry; /* debugfs */ + struct dentry *ls_debug_queued_asts_dentry; /* debugfs */ + + wait_queue_head_t ls_uevent_wait; /* user part of join/leave */ + int ls_uevent_result; + struct completion ls_recovery_done; + int ls_recovery_result; + + struct miscdevice ls_device; + + struct workqueue_struct *ls_callback_wq; + + /* recovery related */ + + spinlock_t ls_cb_lock; + struct list_head ls_cb_delay; /* save for queue_work later */ + struct timer_list ls_timer; + struct task_struct *ls_recoverd_task; + struct mutex ls_recoverd_active; + spinlock_t ls_recover_lock; + unsigned long ls_recover_begin; /* jiffies timestamp */ + uint32_t ls_recover_status; /* DLM_RS_ */ + uint64_t ls_recover_seq; + struct dlm_recover *ls_recover_args; + struct rw_semaphore ls_in_recovery; /* block local requests */ + struct rw_semaphore ls_recv_active; /* block dlm_recv */ + struct list_head ls_requestqueue;/* queue remote requests */ + atomic_t ls_requestqueue_cnt; + wait_queue_head_t ls_requestqueue_wait; + struct mutex ls_requestqueue_mutex; + struct dlm_rcom *ls_recover_buf; + int ls_recover_nodeid; /* for debugging */ + unsigned int ls_recover_dir_sent_res; /* for log info */ + unsigned int ls_recover_dir_sent_msg; /* for log info */ + unsigned int ls_recover_locks_in; /* for log info */ + uint64_t ls_rcom_seq; + spinlock_t ls_rcom_spin; + struct list_head ls_recover_list; + spinlock_t ls_recover_list_lock; + int ls_recover_list_count; + struct idr ls_recover_idr; + spinlock_t ls_recover_idr_lock; + wait_queue_head_t ls_wait_general; + wait_queue_head_t ls_recover_lock_wait; + spinlock_t ls_clear_proc_locks; + + struct list_head ls_root_list; /* root resources */ + struct rw_semaphore ls_root_sem; /* protect root_list */ + + const struct dlm_lockspace_ops *ls_ops; + void *ls_ops_arg; + + int ls_namelen; + char ls_name[DLM_LOCKSPACE_LEN + 1]; +}; + +/* + * LSFL_RECOVER_STOP - dlm_ls_stop() sets this to tell dlm recovery routines + * that they should abort what they're doing so new recovery can be started. + * + * LSFL_RECOVER_DOWN - dlm_ls_stop() sets this to tell dlm_recoverd that it + * should do down_write() on the in_recovery rw_semaphore. (doing down_write + * within dlm_ls_stop causes complaints about the lock acquired/released + * in different contexts.) + * + * LSFL_RECOVER_LOCK - dlm_recoverd holds the in_recovery rw_semaphore. + * It sets this after it is done with down_write() on the in_recovery + * rw_semaphore and clears it after it has released the rw_semaphore. + * + * LSFL_RECOVER_WORK - dlm_ls_start() sets this to tell dlm_recoverd that it + * should begin recovery of the lockspace. + * + * LSFL_RUNNING - set when normal locking activity is enabled. + * dlm_ls_stop() clears this to tell dlm locking routines that they should + * quit what they are doing so recovery can run. dlm_recoverd sets + * this after recovery is finished. + */ + +#define LSFL_RECOVER_STOP 0 +#define LSFL_RECOVER_DOWN 1 +#define LSFL_RECOVER_LOCK 2 +#define LSFL_RECOVER_WORK 3 +#define LSFL_RUNNING 4 + +#define LSFL_RCOM_READY 5 +#define LSFL_RCOM_WAIT 6 +#define LSFL_UEVENT_WAIT 7 +#define LSFL_CB_DELAY 9 +#define LSFL_NODIR 10 + +/* much of this is just saving user space pointers associated with the + lock that we pass back to the user lib with an ast */ + +struct dlm_user_args { + struct dlm_user_proc *proc; /* each process that opens the lockspace + device has private data + (dlm_user_proc) on the struct file, + the process's locks point back to it*/ + struct dlm_lksb lksb; + struct dlm_lksb __user *user_lksb; + void __user *castparam; + void __user *castaddr; + void __user *bastparam; + void __user *bastaddr; + uint64_t xid; +}; + +#define DLM_PROC_FLAGS_CLOSING 1 +#define DLM_PROC_FLAGS_COMPAT 2 + +/* locks list is kept so we can remove all a process's locks when it + exits (or orphan those that are persistent) */ + +struct dlm_user_proc { + dlm_lockspace_t *lockspace; + unsigned long flags; /* DLM_PROC_FLAGS */ + struct list_head asts; + spinlock_t asts_spin; + struct list_head locks; + spinlock_t locks_spin; + struct list_head unlocking; + wait_queue_head_t wait; +}; + +static inline int dlm_locking_stopped(struct dlm_ls *ls) +{ + return !test_bit(LSFL_RUNNING, &ls->ls_flags); +} + +static inline int dlm_recovery_stopped(struct dlm_ls *ls) +{ + return test_bit(LSFL_RECOVER_STOP, &ls->ls_flags); +} + +static inline int dlm_no_directory(struct dlm_ls *ls) +{ + return test_bit(LSFL_NODIR, &ls->ls_flags); +} + +/* takes a snapshot from dlm atomic flags */ +static inline uint32_t dlm_flags_val(const unsigned long *addr, + uint32_t min, uint32_t max) +{ + uint32_t bit = min, val = 0; + + for_each_set_bit_from(bit, addr, max + 1) { + val |= BIT(bit); + } + + return val; +} + +static inline uint32_t dlm_iflags_val(const struct dlm_lkb *lkb) +{ + return dlm_flags_val(&lkb->lkb_iflags, __DLM_IFL_MIN_BIT, + __DLM_IFL_MAX_BIT); +} + +static inline uint32_t dlm_dflags_val(const struct dlm_lkb *lkb) +{ + return dlm_flags_val(&lkb->lkb_dflags, __DLM_DFL_MIN_BIT, + __DLM_DFL_MAX_BIT); +} + +/* coming from UAPI header + * + * TODO: + * Move this to UAPI header and let other values point to them and use BIT() + */ +#define DLM_SBF_DEMOTED_BIT 0 +#define __DLM_SBF_MIN_BIT DLM_SBF_DEMOTED_BIT +#define DLM_SBF_VALNOTVALID_BIT 1 +#define DLM_SBF_ALTMODE_BIT 2 +#define __DLM_SBF_MAX_BIT DLM_SBF_ALTMODE_BIT + +static inline uint32_t dlm_sbflags_val(const struct dlm_lkb *lkb) +{ + /* be sure the next person updates this */ + BUILD_BUG_ON(BIT(__DLM_SBF_MAX_BIT) != DLM_SBF_ALTMODE); + + return dlm_flags_val(&lkb->lkb_sbflags, __DLM_SBF_MIN_BIT, + __DLM_SBF_MAX_BIT); +} + +static inline void dlm_set_flags_val(unsigned long *addr, uint32_t val, + uint32_t min, uint32_t max) +{ + uint32_t bit; + + for (bit = min; bit < (max + 1); bit++) { + if (val & BIT(bit)) + set_bit(bit, addr); + else + clear_bit(bit, addr); + } +} + +static inline void dlm_set_dflags_val(struct dlm_lkb *lkb, uint32_t val) +{ + dlm_set_flags_val(&lkb->lkb_dflags, val, __DLM_DFL_MIN_BIT, + __DLM_DFL_MAX_BIT); +} + +static inline void dlm_set_sbflags_val(struct dlm_lkb *lkb, uint32_t val) +{ + dlm_set_flags_val(&lkb->lkb_sbflags, val, __DLM_SBF_MIN_BIT, + __DLM_SBF_MAX_BIT); +} + +int dlm_plock_init(void); +void dlm_plock_exit(void); + +#ifdef CONFIG_DLM_DEBUG +void dlm_register_debugfs(void); +void dlm_unregister_debugfs(void); +void dlm_create_debug_file(struct dlm_ls *ls); +void dlm_delete_debug_file(struct dlm_ls *ls); +void *dlm_create_debug_comms_file(int nodeid, void *data); +void dlm_delete_debug_comms_file(void *ctx); +#else +static inline void dlm_register_debugfs(void) { } +static inline void dlm_unregister_debugfs(void) { } +static inline void dlm_create_debug_file(struct dlm_ls *ls) { } +static inline void dlm_delete_debug_file(struct dlm_ls *ls) { } +static inline void *dlm_create_debug_comms_file(int nodeid, void *data) { return NULL; } +static inline void dlm_delete_debug_comms_file(void *ctx) { } +#endif + +#endif /* __DLM_INTERNAL_DOT_H__ */ + |