diff options
Diffstat (limited to 'fs/dlm')
| -rw-r--r-- | fs/dlm/ast.c | 257 | ||||
| -rw-r--r-- | fs/dlm/ast.h | 7 | ||||
| -rw-r--r-- | fs/dlm/debug_fs.c | 4 | ||||
| -rw-r--r-- | fs/dlm/dlm_internal.h | 35 | ||||
| -rw-r--r-- | fs/dlm/lock.c | 38 | ||||
| -rw-r--r-- | fs/dlm/rcom.c | 4 | ||||
| -rw-r--r-- | fs/dlm/user.c | 185 | ||||
| -rw-r--r-- | fs/dlm/user.h | 3 |
8 files changed, 311 insertions, 222 deletions
diff --git a/fs/dlm/ast.c b/fs/dlm/ast.c index 4314f0d..abc49f2 100644 --- a/fs/dlm/ast.c +++ b/fs/dlm/ast.c @@ -18,6 +18,7 @@ #define WAKE_ASTS 0 +static uint64_t ast_seq_count; static struct list_head ast_queue; static spinlock_t ast_queue_lock; static struct task_struct * astd_task; @@ -25,40 +26,186 @@ static unsigned long astd_wakeflags; static struct mutex astd_running; +static void dlm_dump_lkb_callbacks(struct dlm_lkb *lkb) +{ + int i; + + log_print("last_bast %x %llu flags %x mode %d sb %d %x", + lkb->lkb_id, + (unsigned long long)lkb->lkb_last_bast.seq, + lkb->lkb_last_bast.flags, + lkb->lkb_last_bast.mode, + lkb->lkb_last_bast.sb_status, + lkb->lkb_last_bast.sb_flags); + + log_print("last_cast %x %llu flags %x mode %d sb %d %x", + lkb->lkb_id, + (unsigned long long)lkb->lkb_last_cast.seq, + lkb->lkb_last_cast.flags, + lkb->lkb_last_cast.mode, + lkb->lkb_last_cast.sb_status, + lkb->lkb_last_cast.sb_flags); + + for (i = 0; i < DLM_CALLBACKS_SIZE; i++) { + log_print("cb %x %llu flags %x mode %d sb %d %x", + lkb->lkb_id, + (unsigned long long)lkb->lkb_callbacks[i].seq, + lkb->lkb_callbacks[i].flags, + lkb->lkb_callbacks[i].mode, + lkb->lkb_callbacks[i].sb_status, + lkb->lkb_callbacks[i].sb_flags); + } +} + void dlm_del_ast(struct dlm_lkb *lkb) { spin_lock(&ast_queue_lock); - if (lkb->lkb_ast_type & (AST_COMP | AST_BAST)) - list_del(&lkb->lkb_astqueue); + if (!list_empty(&lkb->lkb_astqueue)) + list_del_init(&lkb->lkb_astqueue); spin_unlock(&ast_queue_lock); } -void dlm_add_ast(struct dlm_lkb *lkb, int type, int mode) +int dlm_add_lkb_callback(struct dlm_lkb *lkb, uint32_t flags, int mode, + int status, uint32_t sbflags, uint64_t seq) { + struct dlm_ls *ls = lkb->lkb_resource->res_ls; + uint64_t prev_seq; + int prev_mode; + int i; + + for (i = 0; i < DLM_CALLBACKS_SIZE; i++) { + if (lkb->lkb_callbacks[i].seq) + continue; + + /* + * Suppress some redundant basts here, do more on removal. + * Don't even add a bast if the callback just before it + * is a bast for the same mode or a more restrictive mode. + * (the addional > PR check is needed for PR/CW inversion) + */ + + if ((i > 0) && (flags & DLM_CB_BAST) && + (lkb->lkb_callbacks[i-1].flags & DLM_CB_BAST)) { + + prev_seq = lkb->lkb_callbacks[i-1].seq; + prev_mode = lkb->lkb_callbacks[i-1].mode; + + if ((prev_mode == mode) || + (prev_mode > mode && prev_mode > DLM_LOCK_PR)) { + + log_debug(ls, "skip %x add bast %llu mode %d " + "for bast %llu mode %d", + lkb->lkb_id, + (unsigned long long)seq, + mode, + (unsigned long long)prev_seq, + prev_mode); + return 0; + } + } + + lkb->lkb_callbacks[i].seq = seq; + lkb->lkb_callbacks[i].flags = flags; + lkb->lkb_callbacks[i].mode = mode; + lkb->lkb_callbacks[i].sb_status = status; + lkb->lkb_callbacks[i].sb_flags = (sbflags & 0x000000FF); + break; + } + + if (i == DLM_CALLBACKS_SIZE) { + log_error(ls, "no callbacks %x %llu flags %x mode %d sb %d %x", + lkb->lkb_id, (unsigned long long)seq, + flags, mode, status, sbflags); + dlm_dump_lkb_callbacks(lkb); + return -1; + } + + return 0; +} + +int dlm_rem_lkb_callback(struct dlm_ls *ls, struct dlm_lkb *lkb, + struct dlm_callback *cb, int *resid) +{ + int i; + + *resid = 0; + + if (!lkb->lkb_callbacks[0].seq) + return -ENOENT; + + /* oldest undelivered cb is callbacks[0] */ + + memcpy(cb, &lkb->lkb_callbacks[0], sizeof(struct dlm_callback)); + memset(&lkb->lkb_callbacks[0], 0, sizeof(struct dlm_callback)); + + /* shift others down */ + + for (i = 1; i < DLM_CALLBACKS_SIZE; i++) { + if (!lkb->lkb_callbacks[i].seq) + break; + memcpy(&lkb->lkb_callbacks[i-1], &lkb->lkb_callbacks[i], + sizeof(struct dlm_callback)); + memset(&lkb->lkb_callbacks[i], 0, sizeof(struct dlm_callback)); + (*resid)++; + } + + /* if cb is a bast, it should be skipped if the blocking mode is + compatible with the last granted mode */ + + if ((cb->flags & DLM_CB_BAST) && lkb->lkb_last_cast.seq) { + if (dlm_modes_compat(cb->mode, lkb->lkb_last_cast.mode)) { + cb->flags |= DLM_CB_SKIP; + + log_debug(ls, "skip %x bast %llu mode %d " + "for cast %llu mode %d", + lkb->lkb_id, + (unsigned long long)cb->seq, + cb->mode, + (unsigned long long)lkb->lkb_last_cast.seq, + lkb->lkb_last_cast.mode); + return 0; + } + } + + if (cb->flags & DLM_CB_CAST) { + memcpy(&lkb->lkb_last_cast, cb, sizeof(struct dlm_callback)); + lkb->lkb_last_cast_time = ktime_get(); + } + + if (cb->flags & DLM_CB_BAST) { + memcpy(&lkb->lkb_last_bast, cb, sizeof(struct dlm_callback)); + lkb->lkb_last_bast_time = ktime_get(); + } + + return 0; +} + +void dlm_add_ast(struct dlm_lkb *lkb, uint32_t flags, int mode, int status, + uint32_t sbflags) +{ + uint64_t seq; + int rv; + + spin_lock(&ast_queue_lock); + + seq = ++ast_seq_count; + if (lkb->lkb_flags & DLM_IFL_USER) { - dlm_user_add_ast(lkb, type, mode); + spin_unlock(&ast_queue_lock); + dlm_user_add_ast(lkb, flags, mode, status, sbflags, seq); return; } - spin_lock(&ast_queue_lock); - if (!(lkb->lkb_ast_type & (AST_COMP | AST_BAST))) { + rv = dlm_add_lkb_callback(lkb, flags, mode, status, sbflags, seq); + if (rv < 0) { + spin_unlock(&ast_queue_lock); + return; + } + + if (list_empty(&lkb->lkb_astqueue)) { kref_get(&lkb->lkb_ref); list_add_tail(&lkb->lkb_astqueue, &ast_queue); - lkb->lkb_ast_first = type; } - - /* sanity check, this should not happen */ - - if ((type == AST_COMP) && (lkb->lkb_ast_type & AST_COMP)) - log_print("repeat cast %d castmode %d lock %x %s", - mode, lkb->lkb_castmode, - lkb->lkb_id, lkb->lkb_resource->res_name); - - lkb->lkb_ast_type |= type; - if (type == AST_BAST) - lkb->lkb_bastmode = mode; - else - lkb->lkb_castmode = mode; spin_unlock(&ast_queue_lock); set_bit(WAKE_ASTS, &astd_wakeflags); @@ -72,7 +219,8 @@ static void process_asts(void) struct dlm_lkb *lkb; void (*castfn) (void *astparam); void (*bastfn) (void *astparam, int mode); - int type, first, bastmode, castmode, do_bast, do_cast, last_castmode; + struct dlm_callback callbacks[DLM_CALLBACKS_SIZE]; + int i, rv, resid; repeat: spin_lock(&ast_queue_lock); @@ -83,54 +231,45 @@ repeat: if (dlm_locking_stopped(ls)) continue; - list_del(&lkb->lkb_astqueue); - type = lkb->lkb_ast_type; - lkb->lkb_ast_type = 0; - first = lkb->lkb_ast_first; - lkb->lkb_ast_first = 0; - bastmode = lkb->lkb_bastmode; - castmode = lkb->lkb_castmode; + /* we remove from astqueue list and remove everything in + lkb_callbacks before releasing the spinlock so empty + lkb_astqueue is always consistent with empty lkb_callbacks */ + + list_del_init(&lkb->lkb_astqueue); + castfn = lkb->lkb_astfn; bastfn = lkb->lkb_bastfn; - spin_unlock(&ast_queue_lock); - do_cast = (type & AST_COMP) && castfn; - do_bast = (type & AST_BAST) && bastfn; + memset(&callbacks, 0, sizeof(callbacks)); - /* Skip a bast if its blocking mode is compatible with the - granted mode of the preceding cast. */ + for (i = 0; i < DLM_CALLBACKS_SIZE; i++) { + rv = dlm_rem_lkb_callback(ls, lkb, &callbacks[i], &resid); + if (rv < 0) + break; + } + spin_unlock(&ast_queue_lock); - if (do_bast) { - if (first == AST_COMP) - last_castmode = castmode; - else - last_castmode = lkb->lkb_castmode_done; - if (dlm_modes_compat(bastmode, last_castmode)) - do_bast = 0; + if (resid) { + /* shouldn't happen, for loop should have removed all */ + log_error(ls, "callback resid %d lkb %x", + resid, lkb->lkb_id); } - if (first == AST_COMP) { - if (do_cast) - castfn(lkb->lkb_astparam); - if (do_bast) - bastfn(lkb->lkb_astparam, bastmode); - } else if (first == AST_BAST) { - if (do_bast) - bastfn(lkb->lkb_astparam, bastmode); - if (do_cast) + for (i = 0; i < DLM_CALLBACKS_SIZE; i++) { + if (!callbacks[i].seq) + break; + if (callbacks[i].flags & DLM_CB_SKIP) { + continue; + } else if (callbacks[i].flags & DLM_CB_BAST) { + bastfn(lkb->lkb_astparam, callbacks[i].mode); + } else if (callbacks[i].flags & DLM_CB_CAST) { + lkb->lkb_lksb->sb_status = callbacks[i].sb_status; + lkb->lkb_lksb->sb_flags = callbacks[i].sb_flags; castfn(lkb->lkb_astparam); - } else { - log_error(ls, "bad ast_first %d ast_type %d", - first, type); + } } - if (do_cast) - lkb->lkb_castmode_done = castmode; - if (do_bast) - lkb->lkb_bastmode_done = bastmode; - - /* this removes the reference added by dlm_add_ast - and may result in the lkb being freed */ + /* removes ref for ast_queue, may cause lkb to be freed */ dlm_put_lkb(lkb); cond_resched(); diff --git a/fs/dlm/ast.h b/fs/dlm/ast.h index bcb1aab..8aa89c9 100644 --- a/fs/dlm/ast.h +++ b/fs/dlm/ast.h @@ -13,8 +13,13 @@ #ifndef __ASTD_DOT_H__ #define __ASTD_DOT_H__ -void dlm_add_ast(struct dlm_lkb *lkb, int type, int mode); void dlm_del_ast(struct dlm_lkb *lkb); +int dlm_add_lkb_callback(struct dlm_lkb *lkb, uint32_t flags, int mode, + int status, uint32_t sbflags, uint64_t seq); +int dlm_rem_lkb_callback(struct dlm_ls *ls, struct dlm_lkb *lkb, + struct dlm_callback *cb, int *resid); +void dlm_add_ast(struct dlm_lkb *lkb, uint32_t flags, int mode, int status, + uint32_t sbflags); void dlm_astd_wake(void); int dlm_astd_start(void); diff --git a/fs/dlm/debug_fs.c b/fs/dlm/debug_fs.c index 6b42ba8..5977923 100644 --- a/fs/dlm/debug_fs.c +++ b/fs/dlm/debug_fs.c @@ -257,12 +257,12 @@ static int print_format3_lock(struct seq_file *s, struct dlm_lkb *lkb, lkb->lkb_status, lkb->lkb_grmode, lkb->lkb_rqmode, - lkb->lkb_bastmode, + lkb->lkb_last_bast.mode, rsb_lookup, lkb->lkb_wait_type, lkb->lkb_lvbseq, (unsigned long long)ktime_to_ns(lkb->lkb_timestamp), - (unsigned long long)ktime_to_ns(lkb->lkb_time_bast)); + (unsigned long long)ktime_to_ns(lkb->lkb_last_bast_time)); return rv; } diff --git a/fs/dlm/dlm_internal.h b/fs/dlm/dlm_internal.h index f632b58..b942049 100644 --- a/fs/dlm/dlm_internal.h +++ b/fs/dlm/dlm_internal.h @@ -192,11 +192,6 @@ struct dlm_args { * lkb is a process copy, the nodeid specifies the lock master. */ -/* lkb_ast_type */ - -#define AST_COMP 1 -#define AST_BAST 2 - /* lkb_status */ #define DLM_LKSTS_WAITING 1 @@ -217,6 +212,20 @@ struct dlm_args { #define DLM_IFL_USER 0x00000001 #define DLM_IFL_ORPHAN 0x00000002 +#define DLM_CALLBACKS_SIZE 6 + +#define DLM_CB_CAST 0x00000001 +#define DLM_CB_BAST 0x00000002 +#define DLM_CB_SKIP 0x00000004 + +struct dlm_callback { + uint64_t seq; + 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 dlm_lkb { struct dlm_rsb *lkb_resource; /* the rsb */ struct kref lkb_ref; @@ -236,13 +245,6 @@ struct dlm_lkb { int8_t lkb_wait_type; /* type of reply waiting for */ int8_t lkb_wait_count; - int8_t lkb_ast_type; /* type of ast queued for */ - int8_t lkb_ast_first; /* type of first ast queued */ - - int8_t lkb_bastmode; /* req mode of queued bast */ - int8_t lkb_castmode; /* gr mode of queued cast */ - int8_t lkb_bastmode_done; /* last delivered bastmode */ - int8_t lkb_castmode_done; /* last delivered castmode */ struct list_head lkb_idtbl_list; /* lockspace lkbtbl */ struct list_head lkb_statequeue; /* rsb g/c/w list */ @@ -251,10 +253,15 @@ struct dlm_lkb { struct list_head lkb_astqueue; /* need ast to be sent */ struct list_head lkb_ownqueue; /* list of locks for a process */ struct list_head lkb_time_list; - ktime_t lkb_time_bast; /* for debugging */ ktime_t lkb_timestamp; unsigned long lkb_timeout_cs; + struct dlm_callback lkb_callbacks[DLM_CALLBACKS_SIZE]; + struct dlm_callback lkb_last_cast; + struct dlm_callback lkb_last_bast; + ktime_t lkb_last_cast_time; /* for debugging */ + ktime_t lkb_last_bast_time; /* for debugging */ + char *lkb_lvbptr; struct dlm_lksb *lkb_lksb; /* caller's status block */ void (*lkb_astfn) (void *astparam); @@ -544,8 +551,6 @@ struct dlm_user_args { (dlm_user_proc) on the struct file, the process's locks point back to it*/ struct dlm_lksb lksb; - int old_mode; - int update_user_lvb; struct dlm_lksb __user *user_lksb; void __user *castparam; void __user *castaddr; diff --git a/fs/dlm/lock.c b/fs/dlm/lock.c index 64e5f3e..04b8c44 100644 --- a/fs/dlm/lock.c +++ b/fs/dlm/lock.c @@ -160,10 +160,10 @@ static const int __quecvt_compat_matrix[8][8] = { void dlm_print_lkb(struct dlm_lkb *lkb) { printk(KERN_ERR "lkb: nodeid %d id %x remid %x exflags %x flags %x\n" - " status %d rqmode %d grmode %d wait_type %d ast_type %d\n", + " status %d rqmode %d grmode %d wait_type %d\n", lkb->lkb_nodeid, lkb->lkb_id, lkb->lkb_remid, lkb->lkb_exflags, lkb->lkb_flags, lkb->lkb_status, lkb->lkb_rqmode, - lkb->lkb_grmode, lkb->lkb_wait_type, lkb->lkb_ast_type); + lkb->lkb_grmode, lkb->lkb_wait_type); } static void dlm_print_rsb(struct dlm_rsb *r) @@ -305,10 +305,7 @@ static void queue_cast(struct dlm_rsb *r, struct dlm_lkb *lkb, int rv) rv = -EDEADLK; } - lkb->lkb_lksb->sb_status = rv; - lkb->lkb_lksb->sb_flags = lkb->lkb_sbflags; - - dlm_add_ast(lkb, AST_COMP, lkb->lkb_grmode); + dlm_add_ast(lkb, DLM_CB_CAST, lkb->lkb_grmode, rv, lkb->lkb_sbflags); } static inline void queue_cast_overlap(struct dlm_rsb *r, struct dlm_lkb *lkb) @@ -319,13 +316,10 @@ static inline void queue_cast_overlap(struct dlm_rsb *r, struct dlm_lkb *lkb) static void queue_bast(struct dlm_rsb *r, struct dlm_lkb *lkb, int rqmode) { - lkb->lkb_time_bast = ktime_get(); - if (is_master_copy(lkb)) { - lkb->lkb_bastmode = rqmode; /* printed by debugfs */ send_bast(r, lkb, rqmode); } else { - dlm_add_ast(lkb, AST_BAST, rqmode); + dlm_add_ast(lkb, DLM_CB_BAST, rqmode, 0, 0); } } @@ -600,6 +594,7 @@ static int create_lkb(struct dlm_ls *ls, struct dlm_lkb **lkb_ret) INIT_LIST_HEAD(&lkb->lkb_ownqueue); INIT_LIST_HEAD(&lkb->lkb_rsb_lookup); INIT_LIST_HEAD(&lkb->lkb_time_list); + INIT_LIST_HEAD(&lkb->lkb_astqueue); get_random_bytes(&bucket, sizeof(bucket)); bucket &= (ls->ls_lkbtbl_size - 1); @@ -2819,9 +2814,9 @@ static void send_args(struct dlm_rsb *r, struct dlm_lkb *lkb, not from lkb fields */ if (lkb->lkb_bastfn) - ms->m_asts |= AST_BAST; + ms->m_asts |= DLM_CB_BAST; if (lkb->lkb_astfn) - ms->m_asts |= AST_COMP; + ms->m_asts |= DLM_CB_CAST; /* compare with switch in create_message; send_remove() doesn't use send_args() */ @@ -3122,8 +3117,8 @@ static int receive_request_args(struct dlm_ls *ls, struct dlm_lkb *lkb, lkb->lkb_grmode = DLM_LOCK_IV; lkb->lkb_rqmode = ms->m_rqmode; - lkb->lkb_bastfn = (ms->m_asts & AST_BAST) ? &fake_bastfn : NULL; - lkb->lkb_astfn = (ms->m_asts & AST_COMP) ? &fake_astfn : NULL; + lkb->lkb_bastfn = (ms->m_asts & DLM_CB_BAST) ? &fake_bastfn : NULL; + lkb->lkb_astfn = (ms->m_asts & DLM_CB_CAST) ? &fake_astfn : NULL; if (lkb->lkb_exflags & DLM_LKF_VALBLK) { /* lkb was just created so there won't be an lvb yet */ @@ -4412,8 +4407,8 @@ static int receive_rcom_lock_args(struct dlm_ls *ls, struct dlm_lkb *lkb, lkb->lkb_grmode = rl->rl_grmode; /* don't set lkb_status because add_lkb wants to itself */ - lkb->lkb_bastfn = (rl->rl_asts & AST_BAST) ? &fake_bastfn : NULL; - lkb->lkb_astfn = (rl->rl_asts & AST_COMP) ? &fake_astfn : NULL; + lkb->lkb_bastfn = (rl->rl_asts & DLM_CB_BAST) ? &fake_bastfn : NULL; + lkb->lkb_astfn = (rl->rl_asts & DLM_CB_CAST) ? &fake_astfn : NULL; if (lkb->lkb_exflags & DLM_LKF_VALBLK) { int lvblen = rc->rc_header.h_length - sizeof(struct dlm_rcom) - @@ -4589,7 +4584,6 @@ int dlm_user_request(struct dlm_ls *ls, struct dlm_user_args *ua, error = set_lock_args(mode, &ua->lksb, flags, namelen, timeout_cs, fake_astfn, ua, fake_bastfn, &args); lkb->lkb_flags |= DLM_IFL_USER; - ua->old_mode = DLM_LOCK_IV; if (error) { __put_lkb(ls, lkb); @@ -4658,7 +4652,6 @@ int dlm_user_convert(struct dlm_ls *ls, struct dlm_user_args *ua_tmp, ua->bastparam = ua_tmp->bastparam; ua->bastaddr = ua_tmp->bastaddr; ua->user_lksb = ua_tmp->user_lksb; - ua->old_mode = lkb->lkb_grmode; error = set_lock_args(mode, &ua->lksb, flags, 0, timeout_cs, fake_astfn, ua, fake_bastfn, &args); @@ -4917,8 +4910,9 @@ void dlm_clear_proc_locks(struct dlm_ls *ls, struct dlm_user_proc *proc) } list_for_each_entry_safe(lkb, safe, &proc->asts, lkb_astqueue) { - lkb->lkb_ast_type = 0; - list_del(&lkb->lkb_astqueue); + memset(&lkb->lkb_callbacks, 0, + sizeof(struct dlm_callback) * DLM_CALLBACKS_SIZE); + list_del_init(&lkb->lkb_astqueue); dlm_put_lkb(lkb); } @@ -4958,7 +4952,9 @@ static void purge_proc_locks(struct dlm_ls *ls, struct dlm_user_proc *proc) spin_lock(&proc->asts_spin); list_for_each_entry_safe(lkb, safe, &proc->asts, lkb_astqueue) { - list_del(&lkb->lkb_astqueue); + memset(&lkb->lkb_callbacks, 0, + sizeof(struct dlm_callback) * DLM_CALLBACKS_SIZE); + list_del_init(&lkb->lkb_astqueue); dlm_put_lkb(lkb); } spin_unlock(&proc->asts_spin); diff --git a/fs/dlm/rcom.c b/fs/dlm/rcom.c index 3c83a49..f10a50f 100644 --- a/fs/dlm/rcom.c +++ b/fs/dlm/rcom.c @@ -321,9 +321,9 @@ static void pack_rcom_lock(struct dlm_rsb *r, struct dlm_lkb *lkb, rl->rl_wait_type = cpu_to_le16(lkb->lkb_wait_type); if (lkb->lkb_bastfn) - rl->rl_asts |= AST_BAST; + rl->rl_asts |= DLM_CB_BAST; if (lkb->lkb_astfn) - rl->rl_asts |= AST_COMP; + rl->rl_asts |= DLM_CB_CAST; rl->rl_namelen = cpu_to_le16(r->res_length); memcpy(rl->rl_name, r->res_name, r->res_length); diff --git a/fs/dlm/user.c b/fs/dlm/user.c index 66d6c16..d5ab3fe 100644 --- a/fs/dlm/user.c +++ b/fs/dlm/user.c @@ -24,6 +24,7 @@ #include "lock.h" #include "lvb_table.h" #include "user.h" +#include "ast.h" static const char name_prefix[] = "dlm"; static const struct file_operations device_fops; @@ -152,19 +153,16 @@ static void compat_output(struct dlm_lock_result *res, not related to the lifetime of the lkb struct which is managed entirely by refcount. */ -static int lkb_is_endoflife(struct dlm_lkb *lkb, int sb_status, int type) +static int lkb_is_endoflife(int mode, int status) { - switch (sb_status) { + switch (status) { case -DLM_EUNLOCK: return 1; case -DLM_ECANCEL: case -ETIMEDOUT: case -EDEADLK: - if (lkb->lkb_grmode == DLM_LOCK_IV) - return 1; - break; case -EAGAIN: - if (type == AST_COMP && lkb->lkb_grmode == DLM_LOCK_IV) + if (mode == DLM_LOCK_IV) return 1; break; } @@ -174,12 +172,13 @@ static int lkb_is_endoflife(struct dlm_lkb *lkb, int sb_status, int type) /* we could possibly check if the cancel of an orphan has resulted in the lkb being removed and then remove that lkb from the orphans list and free it */ -void dlm_user_add_ast(struct dlm_lkb *lkb, int type, int mode) +void dlm_user_add_ast(struct dlm_lkb *lkb, uint32_t flags, int mode, + int status, uint32_t sbflags, uint64_t seq) { struct dlm_ls *ls; struct dlm_user_args *ua; struct dlm_user_proc *proc; - int eol = 0, ast_type; + int rv; if (lkb->lkb_flags & (DLM_IFL_ORPHAN | DLM_IFL_DEAD)) return; @@ -200,49 +199,29 @@ void dlm_user_add_ast(struct dlm_lkb *lkb, int type, int mode) ua = lkb->lkb_ua; proc = ua->proc; - if (type == AST_BAST && ua->bastaddr == NULL) + if ((flags & DLM_CB_BAST) && ua->bastaddr == NULL) goto out; + if ((flags & DLM_CB_CAST) && lkb_is_endoflife(mode, status)) + lkb->lkb_flags |= DLM_IFL_ENDOFLIFE; + spin_lock(&proc->asts_spin); - ast_type = lkb->lkb_ast_type; - lkb->lkb_ast_type |= type; - if (type == AST_BAST) - lkb->lkb_bastmode = mode; - else - lkb->lkb_castmode = mode; + rv = dlm_add_lkb_callback(lkb, flags, mode, status, sbflags, seq); + if (rv < 0) { + spin_unlock(&proc->asts_spin); + goto out; + } - if (!ast_type) { + if (list_empty(&lkb->lkb_astqueue)) { kref_get(&lkb->lkb_ref); list_add_tail(&lkb->lkb_astqueue, &proc->asts); - lkb->lkb_ast_first = type; wake_up_interruptible(&proc->wait); } - if (type == AST_COMP && (ast_type & AST_COMP)) - log_debug(ls, "ast overlap %x status %x %x", - lkb->lkb_id, ua->lksb.sb_status, lkb->lkb_flags); - - eol = lkb_is_endoflife(lkb, ua->lksb.sb_status, type); - if (eol) { - lkb->lkb_flags |= DLM_IFL_ENDOFLIFE; - } - - /* We want to copy the lvb to userspace when the completion - ast is read if the status is 0, the lock has an lvb and - lvb_ops says we should. We could probably have set_lvb_lock() - set update_user_lvb instead and not need old_mode */ - - if ((lkb->lkb_ast_type & AST_COMP) && - (lkb->lkb_lksb->sb_status == 0) && - lkb->lkb_lksb->sb_lvbptr && - dlm_lvb_operations[ua->old_mode + 1][lkb->lkb_grmode + 1]) - ua->update_user_lvb = 1; - else - ua->update_user_lvb = 0; - spin_unlock(&proc->asts_spin); - if (eol) { + if (lkb->lkb_flags & DLM_IFL_ENDOFLIFE) { + /* N.B. spin_lock locks_spin, not asts_spin */ spin_lock(&proc->locks_spin); if (!list_empty(&lkb->lkb_ownqueue)) { list_del_init(&lkb->lkb_ownqueue); @@ -705,8 +684,9 @@ static int device_close(struct inode *inode, struct file *file) return 0; } -static int copy_result_to_user(struct dlm_user_args *ua, int compat, int type, - int mode, char __user *buf, size_t count) +static int copy_result_to_user(struct dlm_user_args *ua, int compat, + uint32_t flags, int mode, int copy_lvb, + char __user *buf, size_t count) { #ifdef CONFIG_COMPAT struct dlm_lock_result32 result32; @@ -730,7 +710,7 @@ static int copy_result_to_user(struct dlm_user_args *ua, int compat, int type, notes that a new blocking AST address and parameter are set even if the conversion fails, so maybe we should just do that. */ - if (type == AST_BAST) { + if (flags & DLM_CB_BAST) { result.user_astaddr = ua->bastaddr; result.user_astparam = ua->bastparam; result.bast_mode = mode; @@ -750,8 +730,7 @@ static int copy_result_to_user(struct dlm_user_args *ua, int compat, int type, /* copy lvb to userspace if there is one, it's been updated, and the user buffer has space for it */ - if (ua->update_user_lvb && ua->lksb.sb_lvbptr && - count >= len + DLM_USER_LVB_LEN) { + if (copy_lvb && ua->lksb.sb_lvbptr && count >= len + DLM_USER_LVB_LEN) { if (copy_to_user(buf+len, ua->lksb.sb_lvbptr, DLM_USER_LVB_LEN)) { error = -EFAULT; @@ -801,13 +780,12 @@ static ssize_t device_read(struct file *file, char __user *buf, size_t count, struct dlm_user_proc *proc = file->private_data; struct dlm_lkb *lkb; DECLARE_WAITQUEUE(wait, current); - int error = 0, removed; - int ret_type, ret_mode; - int bastmode, castmode, do_bast, do_cast; + struct dlm_callback cb; + int rv, resid, copy_lvb = 0; if (count == sizeof(struct dlm_device_version)) { - error = copy_version_to_user(buf, count); - return error; + rv = copy_version_to_user(buf, count); + return rv; } if (!proc) { @@ -854,92 +832,57 @@ static ssize_t device_read(struct file *file, char __user *buf, size_t count, } } - /* there may be both completion and blocking asts to return for - the lkb, don't remove lkb from asts list unless no asts remain */ + /* if we empty lkb_callbacks, we don't want to unlock the spinlock + without removing lkb_astqueue; so empty lkb_astqueue is always + consistent with empty lkb_callbacks */ lkb = list_entry(proc->asts.next, struct dlm_lkb, lkb_astqueue); - removed = 0; - ret_type = 0; - ret_mode = 0; - do_bast = lkb->lkb_ast_type & AST_BAST; - do_cast = lkb->lkb_ast_type & AST_COMP; - bastmode = lkb->lkb_bastmode; - castmode = lkb->lkb_castmode; - - /* when both are queued figure out which to do first and - switch first so the other goes in the next read */ - - if (do_cast && do_bast) { - if (lkb->lkb_ast_first == AST_COMP) { - ret_type = AST_COMP; - ret_mode = castmode; - lkb->lkb_ast_type &= ~AST_COMP; - lkb->lkb_ast_first = AST_BAST; - } else { - ret_type = AST_BAST; - ret_mode = bastmode; - lkb->lkb_ast_type &= ~AST_BAST; - lkb->lkb_ast_first = AST_COMP; - } - } else { - ret_type = lkb->lkb_ast_first; - ret_mode = (ret_type == AST_COMP) ? castmode : bastmode; - lkb->lkb_ast_type &= ~ret_type; - lkb->lkb_ast_first = 0; + rv = dlm_rem_lkb_callback(lkb->lkb_resource->res_ls, lkb, &cb, &resid); + if (rv < 0) { + /* this shouldn't happen; lkb should have been removed from + list when resid was zero */ + log_print("dlm_rem_lkb_callback empty %x", lkb->lkb_id); + list_del_init(&lkb->lkb_astqueue); + spin_unlock(&proc->asts_spin); + /* removes ref for proc->asts, may cause lkb to be freed */ + dlm_put_lkb(lkb); + goto try_another; } + if (!resid) + list_del_init(&lkb->lkb_astqueue); + spin_unlock(&proc->asts_spin); - /* if we're doing a bast but the bast is unnecessary, then - switch to do nothing or do a cast if that was needed next */ - - if ((ret_type == AST_BAST) && - dlm_modes_compat(bastmode, lkb->lkb_castmode_done)) { - ret_type = 0; - ret_mode = 0; - - if (do_cast) { - ret_type = AST_COMP; - ret_mode = castmode; - lkb->lkb_ast_type &= ~AST_COMP; - lkb->lkb_ast_first = 0; - } + if (cb.flags & DLM_CB_SKIP) { + /* removes ref for proc->asts, may cause lkb to be freed */ + if (!resid) + dlm_put_lkb(lkb); + goto try_another; } - if (lkb->lkb_ast_first != lkb->lkb_ast_type) { - log_print("device_read %x ast_first %x ast_type %x", - lkb->lkb_id, lkb->lkb_ast_first, lkb->lkb_ast_type); - } + if (cb.flags & DLM_CB_CAST) { + int old_mode, new_mode; - if (!lkb->lkb_ast_type) { - list_del(&lkb->lkb_astqueue); - removed = 1; - } - spin_unlock(&proc->asts_spin); + old_mode = lkb->lkb_last_cast.mode; + new_mode = cb.mode; - if (ret_type) { - error = copy_result_to_user(lkb->lkb_ua, - test_bit(DLM_PROC_FLAGS_COMPAT, &proc->flags), - ret_type, ret_mode, buf, count); + if (!cb.sb_status && lkb->lkb_lksb->sb_lvbptr && + dlm_lvb_operations[old_mode + 1][new_mode + 1]) + copy_lvb = 1; - if (ret_type == AST_COMP) - lkb->lkb_castmode_done = castmode; - if (ret_type == AST_BAST) - lkb->lkb_bastmode_done = bastmode; + lkb->lkb_lksb->sb_status = cb.sb_status; + lkb->lkb_lksb->sb_flags = cb.sb_flags; } - /* removes reference for the proc->asts lists added by - dlm_user_add_ast() and may result in the lkb being freed */ + rv = copy_result_to_user(lkb->lkb_ua, + test_bit(DLM_PROC_FLAGS_COMPAT, &proc->flags), + cb.flags, cb.mode, copy_lvb, buf, count); - if (removed) + /* removes ref for proc->asts, may cause lkb to be freed */ + if (!resid) dlm_put_lkb(lkb); - /* the bast that was queued was eliminated (see unnecessary above), - leaving nothing to return */ - - if (!ret_type) - goto try_another; - - return error; + return rv; } static unsigned int device_poll(struct file *file, poll_table *wait) diff --git a/fs/dlm/user.h b/fs/dlm/user.h index f196091..00499ab 100644 --- a/fs/dlm/user.h +++ b/fs/dlm/user.h @@ -9,7 +9,8 @@ #ifndef __USER_DOT_H__ #define __USER_DOT_H__ -void dlm_user_add_ast(struct dlm_lkb *lkb, int type, int mode); +void dlm_user_add_ast(struct dlm_lkb *lkb, uint32_t flags, int mode, + int status, uint32_t sbflags, uint64_t seq); int dlm_user_init(void); void dlm_user_exit(void); int dlm_device_deregister(struct dlm_ls *ls); |