#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;
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);
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);
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();
#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);
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;
}
* 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
#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;
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 */
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);
(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;
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)
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)
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);
}
}
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);
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() */
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 */
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) -
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);
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);
}
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);
}
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);
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);
#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;
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;
}
/* 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;
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);
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;
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;
/* 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;
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) {
}
}
- /* 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)
#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);
projects / openwrt / staging / blogic.git / commitdiff