diff options
Diffstat (limited to 'fs/dlm')
| -rw-r--r-- | fs/dlm/config.c | 7 | ||||
| -rw-r--r-- | fs/dlm/config.h | 1 | ||||
| -rw-r--r-- | fs/dlm/debug_fs.c | 103 | ||||
| -rw-r--r-- | fs/dlm/dir.c | 287 | ||||
| -rw-r--r-- | fs/dlm/dir.h | 7 | ||||
| -rw-r--r-- | fs/dlm/dlm_internal.h | 46 | ||||
| -rw-r--r-- | fs/dlm/lock.c | 1022 | ||||
| -rw-r--r-- | fs/dlm/lock.h | 5 | ||||
| -rw-r--r-- | fs/dlm/lockspace.c | 23 | ||||
| -rw-r--r-- | fs/dlm/rcom.c | 145 | ||||
| -rw-r--r-- | fs/dlm/rcom.h | 1 | ||||
| -rw-r--r-- | fs/dlm/recover.c | 140 | ||||
| -rw-r--r-- | fs/dlm/recover.h | 2 | ||||
| -rw-r--r-- | fs/dlm/recoverd.c | 14 |
14 files changed, 1215 insertions, 588 deletions
diff --git a/fs/dlm/config.c b/fs/dlm/config.c index e7e327d..9ccf734 100644 --- a/fs/dlm/config.c +++ b/fs/dlm/config.c @@ -96,7 +96,6 @@ struct dlm_cluster { unsigned int cl_tcp_port; unsigned int cl_buffer_size; unsigned int cl_rsbtbl_size; - unsigned int cl_dirtbl_size; unsigned int cl_recover_timer; unsigned int cl_toss_secs; unsigned int cl_scan_secs; @@ -113,7 +112,6 @@ enum { CLUSTER_ATTR_TCP_PORT = 0, CLUSTER_ATTR_BUFFER_SIZE, CLUSTER_ATTR_RSBTBL_SIZE, - CLUSTER_ATTR_DIRTBL_SIZE, CLUSTER_ATTR_RECOVER_TIMER, CLUSTER_ATTR_TOSS_SECS, CLUSTER_ATTR_SCAN_SECS, @@ -189,7 +187,6 @@ __CONFIGFS_ATTR(name, 0644, name##_read, name##_write) CLUSTER_ATTR(tcp_port, 1); CLUSTER_ATTR(buffer_size, 1); CLUSTER_ATTR(rsbtbl_size, 1); -CLUSTER_ATTR(dirtbl_size, 1); CLUSTER_ATTR(recover_timer, 1); CLUSTER_ATTR(toss_secs, 1); CLUSTER_ATTR(scan_secs, 1); @@ -204,7 +201,6 @@ static struct configfs_attribute *cluster_attrs[] = { [CLUSTER_ATTR_TCP_PORT] = &cluster_attr_tcp_port.attr, [CLUSTER_ATTR_BUFFER_SIZE] = &cluster_attr_buffer_size.attr, [CLUSTER_ATTR_RSBTBL_SIZE] = &cluster_attr_rsbtbl_size.attr, - [CLUSTER_ATTR_DIRTBL_SIZE] = &cluster_attr_dirtbl_size.attr, [CLUSTER_ATTR_RECOVER_TIMER] = &cluster_attr_recover_timer.attr, [CLUSTER_ATTR_TOSS_SECS] = &cluster_attr_toss_secs.attr, [CLUSTER_ATTR_SCAN_SECS] = &cluster_attr_scan_secs.attr, @@ -478,7 +474,6 @@ static struct config_group *make_cluster(struct config_group *g, cl->cl_tcp_port = dlm_config.ci_tcp_port; cl->cl_buffer_size = dlm_config.ci_buffer_size; cl->cl_rsbtbl_size = dlm_config.ci_rsbtbl_size; - cl->cl_dirtbl_size = dlm_config.ci_dirtbl_size; cl->cl_recover_timer = dlm_config.ci_recover_timer; cl->cl_toss_secs = dlm_config.ci_toss_secs; cl->cl_scan_secs = dlm_config.ci_scan_secs; @@ -1050,7 +1045,6 @@ int dlm_our_addr(struct sockaddr_storage *addr, int num) #define DEFAULT_TCP_PORT 21064 #define DEFAULT_BUFFER_SIZE 4096 #define DEFAULT_RSBTBL_SIZE 1024 -#define DEFAULT_DIRTBL_SIZE 1024 #define DEFAULT_RECOVER_TIMER 5 #define DEFAULT_TOSS_SECS 10 #define DEFAULT_SCAN_SECS 5 @@ -1066,7 +1060,6 @@ struct dlm_config_info dlm_config = { .ci_tcp_port = DEFAULT_TCP_PORT, .ci_buffer_size = DEFAULT_BUFFER_SIZE, .ci_rsbtbl_size = DEFAULT_RSBTBL_SIZE, - .ci_dirtbl_size = DEFAULT_DIRTBL_SIZE, .ci_recover_timer = DEFAULT_RECOVER_TIMER, .ci_toss_secs = DEFAULT_TOSS_SECS, .ci_scan_secs = DEFAULT_SCAN_SECS, diff --git a/fs/dlm/config.h b/fs/dlm/config.h index 9f5e366..dbd35a0 100644 --- a/fs/dlm/config.h +++ b/fs/dlm/config.h @@ -27,7 +27,6 @@ struct dlm_config_info { int ci_tcp_port; int ci_buffer_size; int ci_rsbtbl_size; - int ci_dirtbl_size; int ci_recover_timer; int ci_toss_secs; int ci_scan_secs; diff --git a/fs/dlm/debug_fs.c b/fs/dlm/debug_fs.c index 1c9b0809..b969dee 100644 --- a/fs/dlm/debug_fs.c +++ b/fs/dlm/debug_fs.c @@ -344,6 +344,45 @@ static int print_format3(struct dlm_rsb *r, struct seq_file *s) return rv; } +static int print_format4(struct dlm_rsb *r, struct seq_file *s) +{ + int our_nodeid = dlm_our_nodeid(); + int print_name = 1; + int i, rv; + + lock_rsb(r); + + rv = seq_printf(s, "rsb %p %d %d %d %d %lu %lx %d ", + r, + r->res_nodeid, + r->res_master_nodeid, + r->res_dir_nodeid, + our_nodeid, + r->res_toss_time, + r->res_flags, + r->res_length); + if (rv) + goto out; + + for (i = 0; i < r->res_length; i++) { + if (!isascii(r->res_name[i]) || !isprint(r->res_name[i])) + print_name = 0; + } + + seq_printf(s, "%s", print_name ? "str " : "hex"); + + for (i = 0; i < r->res_length; i++) { + if (print_name) + seq_printf(s, "%c", r->res_name[i]); + else + seq_printf(s, " %02x", (unsigned char)r->res_name[i]); + } + rv = seq_printf(s, "\n"); + out: + unlock_rsb(r); + return rv; +} + struct rsbtbl_iter { struct dlm_rsb *rsb; unsigned bucket; @@ -382,6 +421,13 @@ static int table_seq_show(struct seq_file *seq, void *iter_ptr) } rv = print_format3(ri->rsb, seq); break; + case 4: + if (ri->header) { + seq_printf(seq, "version 4 rsb 2\n"); + ri->header = 0; + } + rv = print_format4(ri->rsb, seq); + break; } return rv; @@ -390,15 +436,18 @@ static int table_seq_show(struct seq_file *seq, void *iter_ptr) static const struct seq_operations format1_seq_ops; static const struct seq_operations format2_seq_ops; static const struct seq_operations format3_seq_ops; +static const struct seq_operations format4_seq_ops; static void *table_seq_start(struct seq_file *seq, loff_t *pos) { + struct rb_root *tree; struct rb_node *node; struct dlm_ls *ls = seq->private; struct rsbtbl_iter *ri; struct dlm_rsb *r; loff_t n = *pos; unsigned bucket, entry; + int toss = (seq->op == &format4_seq_ops); bucket = n >> 32; entry = n & ((1LL << 32) - 1); @@ -417,11 +466,14 @@ static void *table_seq_start(struct seq_file *seq, loff_t *pos) ri->format = 2; if (seq->op == &format3_seq_ops) ri->format = 3; + if (seq->op == &format4_seq_ops) + ri->format = 4; + + tree = toss ? &ls->ls_rsbtbl[bucket].toss : &ls->ls_rsbtbl[bucket].keep; spin_lock(&ls->ls_rsbtbl[bucket].lock); - if (!RB_EMPTY_ROOT(&ls->ls_rsbtbl[bucket].keep)) { - for (node = rb_first(&ls->ls_rsbtbl[bucket].keep); node; - node = rb_next(node)) { + if (!RB_EMPTY_ROOT(tree)) { + for (node = rb_first(tree); node; node = rb_next(node)) { r = rb_entry(node, struct dlm_rsb, res_hashnode); if (!entry--) { dlm_hold_rsb(r); @@ -449,10 +501,11 @@ static void *table_seq_start(struct seq_file *seq, loff_t *pos) kfree(ri); return NULL; } + tree = toss ? &ls->ls_rsbtbl[bucket].toss : &ls->ls_rsbtbl[bucket].keep; spin_lock(&ls->ls_rsbtbl[bucket].lock); - if (!RB_EMPTY_ROOT(&ls->ls_rsbtbl[bucket].keep)) { - node = rb_first(&ls->ls_rsbtbl[bucket].keep); + if (!RB_EMPTY_ROOT(tree)) { + node = rb_first(tree); r = rb_entry(node, struct dlm_rsb, res_hashnode); dlm_hold_rsb(r); ri->rsb = r; @@ -469,10 +522,12 @@ static void *table_seq_next(struct seq_file *seq, void *iter_ptr, loff_t *pos) { struct dlm_ls *ls = seq->private; struct rsbtbl_iter *ri = iter_ptr; + struct rb_root *tree; struct rb_node *next; struct dlm_rsb *r, *rp; loff_t n = *pos; unsigned bucket; + int toss = (seq->op == &format4_seq_ops); bucket = n >> 32; @@ -511,10 +566,11 @@ static void *table_seq_next(struct seq_file *seq, void *iter_ptr, loff_t *pos) kfree(ri); return NULL; } + tree = toss ? &ls->ls_rsbtbl[bucket].toss : &ls->ls_rsbtbl[bucket].keep; spin_lock(&ls->ls_rsbtbl[bucket].lock); - if (!RB_EMPTY_ROOT(&ls->ls_rsbtbl[bucket].keep)) { - next = rb_first(&ls->ls_rsbtbl[bucket].keep); + if (!RB_EMPTY_ROOT(tree)) { + next = rb_first(tree); r = rb_entry(next, struct dlm_rsb, res_hashnode); dlm_hold_rsb(r); ri->rsb = r; @@ -558,9 +614,17 @@ static const struct seq_operations format3_seq_ops = { .show = table_seq_show, }; +static const struct seq_operations format4_seq_ops = { + .start = table_seq_start, + .next = table_seq_next, + .stop = table_seq_stop, + .show = table_seq_show, +}; + static const struct file_operations format1_fops; static const struct file_operations format2_fops; static const struct file_operations format3_fops; +static const struct file_operations format4_fops; static int table_open(struct inode *inode, struct file *file) { @@ -573,6 +637,8 @@ static int table_open(struct inode *inode, struct file *file) ret = seq_open(file, &format2_seq_ops); else if (file->f_op == &format3_fops) ret = seq_open(file, &format3_seq_ops); + else if (file->f_op == &format4_fops) + ret = seq_open(file, &format4_seq_ops); if (ret) return ret; @@ -606,6 +672,14 @@ static const struct file_operations format3_fops = { .release = seq_release }; +static const struct file_operations format4_fops = { + .owner = THIS_MODULE, + .open = table_open, + .read = seq_read, + .llseek = seq_lseek, + .release = seq_release +}; + /* * dump lkb's on the ls_waiters list */ @@ -652,6 +726,8 @@ void dlm_delete_debug_file(struct dlm_ls *ls) debugfs_remove(ls->ls_debug_locks_dentry); if (ls->ls_debug_all_dentry) debugfs_remove(ls->ls_debug_all_dentry); + if (ls->ls_debug_toss_dentry) + debugfs_remove(ls->ls_debug_toss_dentry); } int dlm_create_debug_file(struct dlm_ls *ls) @@ -694,6 +770,19 @@ int dlm_create_debug_file(struct dlm_ls *ls) if (!ls->ls_debug_all_dentry) goto fail; + /* format 4 */ + + memset(name, 0, sizeof(name)); + snprintf(name, DLM_LOCKSPACE_LEN+8, "%s_toss", ls->ls_name); + + ls->ls_debug_toss_dentry = debugfs_create_file(name, + S_IFREG | S_IRUGO, + dlm_root, + ls, + &format4_fops); + if (!ls->ls_debug_toss_dentry) + goto fail; + memset(name, 0, sizeof(name)); snprintf(name, DLM_LOCKSPACE_LEN+8, "%s_waiters", ls->ls_name); diff --git a/fs/dlm/dir.c b/fs/dlm/dir.c index dc5eb59..278a75c 100644 --- a/fs/dlm/dir.c +++ b/fs/dlm/dir.c @@ -23,50 +23,6 @@ #include "lock.h" #include "dir.h" - -static void put_free_de(struct dlm_ls *ls, struct dlm_direntry *de) -{ - spin_lock(&ls->ls_recover_list_lock); - list_add(&de->list, &ls->ls_recover_list); - spin_unlock(&ls->ls_recover_list_lock); -} - -static struct dlm_direntry *get_free_de(struct dlm_ls *ls, int len) -{ - int found = 0; - struct dlm_direntry *de; - - spin_lock(&ls->ls_recover_list_lock); - list_for_each_entry(de, &ls->ls_recover_list, list) { - if (de->length == len) { - list_del(&de->list); - de->master_nodeid = 0; - memset(de->name, 0, len); - found = 1; - break; - } - } - spin_unlock(&ls->ls_recover_list_lock); - - if (!found) - de = kzalloc(sizeof(struct dlm_direntry) + len, GFP_NOFS); - return de; -} - -void dlm_clear_free_entries(struct dlm_ls *ls) -{ - struct dlm_direntry *de; - - spin_lock(&ls->ls_recover_list_lock); - while (!list_empty(&ls->ls_recover_list)) { - de = list_entry(ls->ls_recover_list.next, struct dlm_direntry, - list); - list_del(&de->list); - kfree(de); - } - spin_unlock(&ls->ls_recover_list_lock); -} - /* * We use the upper 16 bits of the hash value to select the directory node. * Low bits are used for distribution of rsb's among hash buckets on each node. @@ -78,144 +34,53 @@ void dlm_clear_free_entries(struct dlm_ls *ls) int dlm_hash2nodeid(struct dlm_ls *ls, uint32_t hash) { - struct list_head *tmp; - struct dlm_member *memb = NULL; - uint32_t node, n = 0; - int nodeid; - - if (ls->ls_num_nodes == 1) { - nodeid = dlm_our_nodeid(); - goto out; - } + uint32_t node; - if (ls->ls_node_array) { + if (ls->ls_num_nodes == 1) + return dlm_our_nodeid(); + else { node = (hash >> 16) % ls->ls_total_weight; - nodeid = ls->ls_node_array[node]; - goto out; - } - - /* make_member_array() failed to kmalloc ls_node_array... */ - - node = (hash >> 16) % ls->ls_num_nodes; - - list_for_each(tmp, &ls->ls_nodes) { - if (n++ != node) - continue; - memb = list_entry(tmp, struct dlm_member, list); - break; + return ls->ls_node_array[node]; } - - DLM_ASSERT(memb , printk("num_nodes=%u n=%u node=%u\n", - ls->ls_num_nodes, n, node);); - nodeid = memb->nodeid; - out: - return nodeid; } int dlm_dir_nodeid(struct dlm_rsb *r) { - return dlm_hash2nodeid(r->res_ls, r->res_hash); -} - -static inline uint32_t dir_hash(struct dlm_ls *ls, char *name, int len) -{ - uint32_t val; - - val = jhash(name, len, 0); - val &= (ls->ls_dirtbl_size - 1); - - return val; -} - -static void add_entry_to_hash(struct dlm_ls *ls, struct dlm_direntry *de) -{ - uint32_t bucket; - - bucket = dir_hash(ls, de->name, de->length); - list_add_tail(&de->list, &ls->ls_dirtbl[bucket].list); + return r->res_dir_nodeid; } -static struct dlm_direntry *search_bucket(struct dlm_ls *ls, char *name, - int namelen, uint32_t bucket) +void dlm_recover_dir_nodeid(struct dlm_ls *ls) { - struct dlm_direntry *de; - - list_for_each_entry(de, &ls->ls_dirtbl[bucket].list, list) { - if (de->length == namelen && !memcmp(name, de->name, namelen)) - goto out; - } - de = NULL; - out: - return de; -} - -void dlm_dir_remove_entry(struct dlm_ls *ls, int nodeid, char *name, int namelen) -{ - struct dlm_direntry *de; - uint32_t bucket; - - bucket = dir_hash(ls, name, namelen); - - spin_lock(&ls->ls_dirtbl[bucket].lock); - - de = search_bucket(ls, name, namelen, bucket); - - if (!de) { - log_error(ls, "remove fr %u none", nodeid); - goto out; - } - - if (de->master_nodeid != nodeid) { - log_error(ls, "remove fr %u ID %u", nodeid, de->master_nodeid); - goto out; - } - - list_del(&de->list); - kfree(de); - out: - spin_unlock(&ls->ls_dirtbl[bucket].lock); -} + struct dlm_rsb *r; -void dlm_dir_clear(struct dlm_ls *ls) -{ - struct list_head *head; - struct dlm_direntry *de; - int i; - - DLM_ASSERT(list_empty(&ls->ls_recover_list), ); - - for (i = 0; i < ls->ls_dirtbl_size; i++) { - spin_lock(&ls->ls_dirtbl[i].lock); - head = &ls->ls_dirtbl[i].list; - while (!list_empty(head)) { - de = list_entry(head->next, struct dlm_direntry, list); - list_del(&de->list); - put_free_de(ls, de); - } - spin_unlock(&ls->ls_dirtbl[i].lock); + down_read(&ls->ls_root_sem); + list_for_each_entry(r, &ls->ls_root_list, res_root_list) { + r->res_dir_nodeid = dlm_hash2nodeid(ls, r->res_hash); } + up_read(&ls->ls_root_sem); } int dlm_recover_directory(struct dlm_ls *ls) { struct dlm_member *memb; - struct dlm_direntry *de; char *b, *last_name = NULL; - int error = -ENOMEM, last_len, count = 0; + int error = -ENOMEM, last_len, nodeid, result; uint16_t namelen; + unsigned int count = 0, count_match = 0, count_bad = 0, count_add = 0; log_debug(ls, "dlm_recover_directory"); if (dlm_no_directory(ls)) goto out_status; - dlm_dir_clear(ls); - last_name = kmalloc(DLM_RESNAME_MAXLEN, GFP_NOFS); if (!last_name) goto out; list_for_each_entry(memb, &ls->ls_nodes, list) { + if (memb->nodeid == dlm_our_nodeid()) + continue; + memset(last_name, 0, DLM_RESNAME_MAXLEN); last_len = 0; @@ -230,7 +95,7 @@ int dlm_recover_directory(struct dlm_ls *ls) if (error) goto out_free; - schedule(); + cond_resched(); /* * pick namelen/name pairs out of received buffer @@ -267,87 +132,71 @@ int dlm_recover_directory(struct dlm_ls *ls) if (namelen > DLM_RESNAME_MAXLEN) goto out_free; - error = -ENOMEM; - de = get_free_de(ls, namelen); - if (!de) + error = dlm_master_lookup(ls, memb->nodeid, + b, namelen, + DLM_LU_RECOVER_DIR, + &nodeid, &result); + if (error) { + log_error(ls, "recover_dir lookup %d", + error); goto out_free; + } + + /* The name was found in rsbtbl, but the + * master nodeid is different from + * memb->nodeid which says it is the master. + * This should not happen. */ + + if (result == DLM_LU_MATCH && + nodeid != memb->nodeid) { + count_bad++; + log_error(ls, "recover_dir lookup %d " + "nodeid %d memb %d bad %u", + result, nodeid, memb->nodeid, + count_bad); + print_hex_dump_bytes("dlm_recover_dir ", + DUMP_PREFIX_NONE, + b, namelen); + } + + /* The name was found in rsbtbl, and the + * master nodeid matches memb->nodeid. */ + + if (result == DLM_LU_MATCH && + nodeid == memb->nodeid) { + count_match++; + } + + /* The name was not found in rsbtbl and was + * added with memb->nodeid as the master. */ + + if (result == DLM_LU_ADD) { + count_add++; + } - de->master_nodeid = memb->nodeid; - de->length = namelen; last_len = namelen; - memcpy(de->name, b, namelen); memcpy(last_name, b, namelen); b += namelen; left -= namelen; - - add_entry_to_hash(ls, de); count++; } } - done: + done: ; } out_status: error = 0; - log_debug(ls, "dlm_recover_directory %d entries", count); + dlm_set_recover_status(ls, DLM_RS_DIR); + + log_debug(ls, "dlm_recover_directory %u in %u new", + count, count_add); out_free: kfree(last_name); out: - dlm_clear_free_entries(ls); return error; } -static int get_entry(struct dlm_ls *ls, int nodeid, char *name, - int namelen, int *r_nodeid) -{ - struct dlm_direntry *de, *tmp; - uint32_t bucket; - - bucket = dir_hash(ls, name, namelen); - - spin_lock(&ls->ls_dirtbl[bucket].lock); - de = search_bucket(ls, name, namelen, bucket); - if (de) { - *r_nodeid = de->master_nodeid; - spin_unlock(&ls->ls_dirtbl[bucket].lock); - if (*r_nodeid == nodeid) - return -EEXIST; - return 0; - } - - spin_unlock(&ls->ls_dirtbl[bucket].lock); - - if (namelen > DLM_RESNAME_MAXLEN) - return -EINVAL; - - de = kzalloc(sizeof(struct dlm_direntry) + namelen, GFP_NOFS); - if (!de) - return -ENOMEM; - - de->master_nodeid = nodeid; - de->length = namelen; - memcpy(de->name, name, namelen); - - spin_lock(&ls->ls_dirtbl[bucket].lock); - tmp = search_bucket(ls, name, namelen, bucket); - if (tmp) { - kfree(de); - de = tmp; - } else { - list_add_tail(&de->list, &ls->ls_dirtbl[bucket].list); - } - *r_nodeid = de->master_nodeid; - spin_unlock(&ls->ls_dirtbl[bucket].lock); - return 0; -} - -int dlm_dir_lookup(struct dlm_ls *ls, int nodeid, char *name, int namelen, - int *r_nodeid) -{ - return get_entry(ls, nodeid, name, namelen, r_nodeid); -} - static struct dlm_rsb *find_rsb_root(struct dlm_ls *ls, char *name, int len) { struct dlm_rsb *r; @@ -358,10 +207,10 @@ static struct dlm_rsb *find_rsb_root(struct dlm_ls *ls, char *name, int len) bucket = hash & (ls->ls_rsbtbl_size - 1); spin_lock(&ls->ls_rsbtbl[bucket].lock); - rv = dlm_search_rsb_tree(&ls->ls_rsbtbl[bucket].keep, name, len, 0, &r); + rv = dlm_search_rsb_tree(&ls->ls_rsbtbl[bucket].keep, name, len, &r); if (rv) rv = dlm_search_rsb_tree(&ls->ls_rsbtbl[bucket].toss, - name, len, 0, &r); + name, len, &r); spin_unlock(&ls->ls_rsbtbl[bucket].lock); if (!rv) @@ -371,7 +220,7 @@ static struct dlm_rsb *find_rsb_root(struct dlm_ls *ls, char *name, int len) list_for_each_entry(r, &ls->ls_root_list, res_root_list) { if (len == r->res_length && !memcmp(name, r->res_name, len)) { up_read(&ls->ls_root_sem); - log_error(ls, "find_rsb_root revert to root_list %s", + log_debug(ls, "find_rsb_root revert to root_list %s", r->res_name); return r; } @@ -429,6 +278,7 @@ void dlm_copy_master_names(struct dlm_ls *ls, char *inbuf, int inlen, be_namelen = cpu_to_be16(0); memcpy(outbuf + offset, &be_namelen, sizeof(__be16)); offset += sizeof(__be16); + ls->ls_recover_dir_sent_msg++; goto out; } @@ -437,6 +287,7 @@ void dlm_copy_master_names(struct dlm_ls *ls, char *inbuf, int inlen, offset += sizeof(__be16); memcpy(outbuf + offset, r->res_name, r->res_length); offset += r->res_length; + ls->ls_recover_dir_sent_res++; } /* @@ -449,8 +300,8 @@ void dlm_copy_master_names(struct dlm_ls *ls, char *inbuf, int inlen, be_namelen = cpu_to_be16(0xFFFF); memcpy(outbuf + offset, &be_namelen, sizeof(__be16)); offset += sizeof(__be16); + ls->ls_recover_dir_sent_msg++; } - out: up_read(&ls->ls_root_sem); } diff --git a/fs/dlm/dir.h b/fs/dlm/dir.h index 0b0eb12..4175063 100644 --- a/fs/dlm/dir.h +++ b/fs/dlm/dir.h @@ -14,15 +14,10 @@ #ifndef __DIR_DOT_H__ #define __DIR_DOT_H__ - int dlm_dir_nodeid(struct dlm_rsb *rsb); int dlm_hash2nodeid(struct dlm_ls *ls, uint32_t hash); -void dlm_dir_remove_entry(struct dlm_ls *ls, int nodeid, char *name, int len); -void dlm_dir_clear(struct dlm_ls *ls); -void dlm_clear_free_entries(struct dlm_ls *ls); +void dlm_recover_dir_nodeid(struct dlm_ls *ls); int dlm_recover_directory(struct dlm_ls *ls); -int dlm_dir_lookup(struct dlm_ls *ls, int nodeid, char *name, int namelen, - int *r_nodeid); void dlm_copy_master_names(struct dlm_ls *ls, char *inbuf, int inlen, char *outbuf, int outlen, int nodeid); diff --git a/fs/dlm/dlm_internal.h b/fs/dlm/dlm_internal.h index bc342f7..3093207 100644 --- a/fs/dlm/dlm_internal.h +++ b/fs/dlm/dlm_internal.h @@ -55,8 +55,6 @@ struct dlm_lkb; struct dlm_rsb; struct dlm_member; struct dlm_rsbtable; -struct dlm_dirtable; -struct dlm_direntry; struct dlm_recover; struct dlm_header; struct dlm_message; @@ -98,18 +96,6 @@ do { \ } -struct dlm_direntry { - struct list_head list; - uint32_t master_nodeid; - uint16_t length; - char name[1]; -}; - -struct dlm_dirtable { - struct list_head list; - spinlock_t lock; -}; - struct dlm_rsbtable { struct rb_root keep; struct rb_root toss; @@ -283,6 +269,15 @@ struct dlm_lkb { }; }; +/* + * 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 */ @@ -291,6 +286,8 @@ struct dlm_rsb { unsigned long res_flags; int res_length; /* length of rsb name */ int res_nodeid; + int res_master_nodeid; + int res_dir_nodeid; uint32_t res_lvbseq; uint32_t res_hash; uint32_t res_bucket; /* rsbtbl */ @@ -313,10 +310,21 @@ struct dlm_rsb { 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_MASTER 1 /* only return rsb if it's a master */ -#define R_CREATE 2 /* create/add rsb if not found */ +#define R_REQUEST 0x00000001 +#define R_RECEIVE_REQUEST 0x00000002 +#define R_RECEIVE_RECOVER 0x00000004 /* rsb_flags */ @@ -509,9 +517,6 @@ struct dlm_ls { struct dlm_rsbtable *ls_rsbtbl; uint32_t ls_rsbtbl_size; - struct dlm_dirtable *ls_dirtbl; - uint32_t ls_dirtbl_size; - struct mutex ls_waiters_mutex; struct list_head ls_waiters; /* lkbs needing a reply */ @@ -545,6 +550,7 @@ struct dlm_ls { 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 */ wait_queue_head_t ls_uevent_wait; /* user part of join/leave */ int ls_uevent_result; @@ -573,6 +579,8 @@ struct dlm_ls { 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; diff --git a/fs/dlm/lock.c b/fs/dlm/lock.c index bdafb65..d9ee1b9 100644 --- a/fs/dlm/lock.c +++ b/fs/dlm/lock.c @@ -90,6 +90,7 @@ static void __receive_convert_reply(struct dlm_rsb *r, struct dlm_lkb *lkb, static int receive_extralen(struct dlm_message *ms); static void do_purge(struct dlm_ls *ls, int nodeid, int pid); static void del_timeout(struct dlm_lkb *lkb); +static void toss_rsb(struct kref *kref); /* * Lock compatibilty matrix - thanks Steve @@ -170,9 +171,11 @@ void dlm_print_lkb(struct dlm_lkb *lkb) static void dlm_print_rsb(struct dlm_rsb *r) { - printk(KERN_ERR "rsb: nodeid %d flags %lx first %x rlc %d name %s\n", - r->res_nodeid, r->res_flags, r->res_first_lkid, - r->res_recover_locks_count, r->res_name); + printk(KERN_ERR "rsb: nodeid %d master %d dir %d flags %lx first %x " + "rlc %d name %s\n", + r->res_nodeid, r->res_master_nodeid, r->res_dir_nodeid, + r->res_flags, r->res_first_lkid, r->res_recover_locks_count, + r->res_name); } void dlm_dump_rsb(struct dlm_rsb *r) @@ -327,6 +330,37 @@ static void queue_bast(struct dlm_rsb *r, struct dlm_lkb *lkb, int rqmode) * Basic operations on rsb's and lkb's */ +/* This is only called to add a reference when the code already holds + a valid reference to the rsb, so there's no need for locking. */ + +static inline void hold_rsb(struct dlm_rsb *r) +{ + kref_get(&r->res_ref); +} + +void dlm_hold_rsb(struct dlm_rsb *r) +{ + hold_rsb(r); +} + +/* When all references to the rsb are gone it's transferred to + the tossed list for later disposal. */ + +static void put_rsb(struct dlm_rsb *r) +{ + struct dlm_ls *ls = r->res_ls; + uint32_t bucket = r->res_bucket; + + spin_lock(&ls->ls_rsbtbl[bucket].lock); + kref_put(&r->res_ref, toss_rsb); + spin_unlock(&ls->ls_rsbtbl[bucket].lock); +} + +void dlm_put_rsb(struct dlm_rsb *r) +{ + put_rsb(r); +} + static int pre_rsb_struct(struct dlm_ls *ls) { struct dlm_rsb *r1, *r2; @@ -411,11 +445,10 @@ static int rsb_cmp(struct dlm_rsb *r, const char *name, int nlen) } int dlm_search_rsb_tree(struct rb_root *tree, char *name, int len, - unsigned int flags, struct dlm_rsb **r_ret) + struct dlm_rsb **r_ret) { struct rb_node *node = tree->rb_node; struct dlm_rsb *r; - int error = 0; int rc; while (node) { @@ -432,10 +465,8 @@ int dlm_search_rsb_tree(struct rb_root *tree, char *name, int len, return -EBADR; found: - if (r->res_nodeid && (flags & R_MASTER)) - error = -ENOTBLK; *r_ret = r; - return error; + return 0; } static int rsb_insert(struct dlm_rsb *rsb, struct rb_root *tree) @@ -467,124 +498,587 @@ static int rsb_insert(struct dlm_rsb *rsb, struct rb_root *tree) return 0; } -static int _search_rsb(struct dlm_ls *ls, char *name, int len, int b, - unsigned int flags, struct dlm_rsb **r_ret) +/* + * Find rsb in rsbtbl and potentially create/add one + * + * Delaying the release of rsb's has a similar benefit to applications keeping + * NL locks on an rsb, but without the guarantee that the cached master value + * will still be valid when the rsb is reused. Apps aren't always smart enough + * to keep NL locks on an rsb that they may lock again shortly; this can lead + * to excessive master lookups and removals if we don't delay the release. + * + * Searching for an rsb means looking through both the normal list and toss + * list. When found on the toss list the rsb is moved to the normal list with + * ref count of 1; when found on normal list the ref count is incremented. + * + * rsb's on the keep list are being used locally and refcounted. + * rsb's on the toss list are not being used locally, and are not refcounted. + * + * The toss list rsb's were either + * - previously used locally but not any more (were on keep list, then + * moved to toss list when last refcount dropped) + * - created and put on toss list as a directory record for a lookup + * (we are the dir node for the res, but are not using the res right now, + * but some other node is) + * + * The purpose of find_rsb() is to return a refcounted rsb for local use. + * So, if the given rsb is on the toss list, it is moved to the keep list + * before being returned. + * + * toss_rsb() happens when all local usage of the rsb is done, i.e. no + * more refcounts exist, so the rsb is moved from the keep list to the + * toss list. + * + * rsb's on both keep and toss lists are used for doing a name to master + * lookups. rsb's that are in use locally (and being refcounted) are on + * the keep list, rsb's that are not in use locally (not refcounted) and + * only exist for name/master lookups are on the toss list. + * + * rsb's on the toss list who's dir_nodeid is not local can have stale + * name/master mappings. So, remote requests on such rsb's can potentially + * return with an error, which means the mapping is stale and needs to + * be updated with a new lookup. (The idea behind MASTER UNCERTAIN and + * first_lkid is to keep only a single outstanding request on an rsb + * while that rsb has a potentially stale master.) + */ + +static int find_rsb_dir(struct dlm_ls *ls, char *name, int len, + uint32_t hash, uint32_t b, + int dir_nodeid, int from_nodeid, + unsigned int flags, struct dlm_rsb **r_ret) { - struct dlm_rsb *r; + struct dlm_rsb *r = NULL; + int our_nodeid = dlm_our_nodeid(); + int from_local = 0; + int from_other = 0; + int from_dir = 0; + int create = 0; int error; - error = dlm_search_rsb_tree(&ls->ls_rsbtbl[b].keep, name, len, flags, &r); - if (!error) { - kref_get(&r->res_ref); - goto out; + if (flags & R_RECEIVE_REQUEST) { + if (from_nodeid == dir_nodeid) + from_dir = 1; + else + from_other = 1; + } else if (flags & R_REQUEST) { + from_local = 1; + } + + /* + * flags & R_RECEIVE_RECOVER is from dlm_recover_master_copy, so + * from_nodeid has sent us a lock in dlm_recover_locks, believing + * we're the new master. Our local recovery may not have set + * res_master_nodeid to our_nodeid yet, so allow either. Don't + * create the rsb; dlm_recover_process_copy() will handle EBADR + * by resending. + * + * If someone sends us a request, we are the dir node, and we do + * not find the rsb anywhere, then recreate it. This happens if + * someone sends us a request after we have removed/freed an rsb + * from our toss list. (They sent a request instead of lookup + * because they are using an rsb from their toss list.) + */ + + if (from_local || from_dir || + (from_other && (dir_nodeid == our_nodeid))) { + create = 1; } - if (error == -ENOTBLK) - goto out; - error = dlm_search_rsb_tree(&ls->ls_rsbtbl[b].toss, name, len, flags, &r); + retry: + if (create) { + error = pre_rsb_struct(ls); + if (error < 0) + goto out; + } + + spin_lock(&ls->ls_rsbtbl[b].lock); + + error = dlm_search_rsb_tree(&ls->ls_rsbtbl[b].keep, name, len, &r); if (error) - goto out; + goto do_toss; + + /* + * rsb is active, so we can't check master_nodeid without lock_rsb. + */ - rb_erase(&r->res_hashnode, &ls->ls_rsbtbl[b].toss); - error = rsb_insert(r, &ls->ls_rsbtbl[b].keep); + kref_get(&r->res_ref); + error = 0; + goto out_unlock; + + + do_toss: + error = dlm_search_rsb_tree(&ls->ls_rsbtbl[b].toss, name, len, &r); if (error) - return error; + goto do_new; - if (dlm_no_directory(ls)) - goto out; + /* + * rsb found inactive (master_nodeid may be out of date unless + * we are the dir_nodeid or were the master) No other thread + * is using this rsb because it's on the toss list, so we can + * look at or update res_master_nodeid without lock_rsb. + */ - if (r->res_nodeid == -1) { + if ((r->res_master_nodeid != our_nodeid) && from_other) { + /* our rsb was not master, and another node (not the dir node) + has sent us a request */ + log_debug(ls, "find_rsb toss from_other %d master %d dir %d %s", + from_nodeid, r->res_master_nodeid, dir_nodeid, + r->res_name); + error = -ENOTBLK; + goto out_unlock; + } + + if ((r->res_master_nodeid != our_nodeid) && from_dir) { + /* don't think this should ever happen */ + log_error(ls, "find_rsb toss from_dir %d master %d", + from_nodeid, r->res_master_nodeid); + dlm_print_rsb(r); + /* fix it and go on */ + r->res_master_nodeid = our_nodeid; + r->res_nodeid = 0; rsb_clear_flag(r, RSB_MASTER_UNCERTAIN); r->res_first_lkid = 0; - } else if (r->res_nodeid > 0) { + } + + if (from_local && (r->res_master_nodeid != our_nodeid)) { + /* Because we have held no locks on this rsb, + res_master_nodeid could have become stale. */ rsb_set_flag(r, RSB_MASTER_UNCERTAIN); r->res_first_lkid = 0; + } + + rb_erase(&r->res_hashnode, &ls->ls_rsbtbl[b].toss); + error = rsb_insert(r, &ls->ls_rsbtbl[b].keep); + goto out_unlock; + + + do_new: + /* + * rsb not found + */ + + if (error == -EBADR && !create) + goto out_unlock; + + error = get_rsb_struct(ls, name, len, &r); + if (error == -EAGAIN) { + spin_unlock(&ls->ls_rsbtbl[b].lock); + goto retry; + } + if (error) + goto out_unlock; + + r->res_hash = hash; + r->res_bucket = b; + r->res_dir_nodeid = dir_nodeid; + kref_init(&r->res_ref); + + if (from_dir) { + /* want to see how often this happens */ + log_debug(ls, "find_rsb new from_dir %d recreate %s", + from_nodeid, r->res_name); + r->res_master_nodeid = our_nodeid; + r->res_nodeid = 0; + goto out_add; + } + + if (from_other && (dir_nodeid != our_nodeid)) { + /* should never happen */ + log_error(ls, "find_rsb new from_other %d dir %d our %d %s", + from_nodeid, dir_nodeid, our_nodeid, r->res_name); + dlm_free_rsb(r); + error = -ENOTBLK; + goto out_unlock; + } + + if (from_other) { + log_debug(ls, "find_rsb new from_other %d dir %d %s", + from_nodeid, dir_nodeid, r->res_name); + } + + if (dir_nodeid == our_nodeid) { + /* When we are the dir nodeid, we can set the master + node immediately */ + r->res_master_nodeid = our_nodeid; + r->res_nodeid = 0; } else { - DLM_ASSERT(r->res_nodeid == 0, dlm_print_rsb(r);); - DLM_ASSERT(!rsb_flag(r, RSB_MASTER_UNCERTAIN),); + /* set_master will send_lookup to dir_nodeid */ + r->res_master_nodeid = 0; + r->res_nodeid = -1; } + + out_add: + error = rsb_insert(r, &ls->ls_rsbtbl[b].keep); + out_unlock: + spin_unlock(&ls->ls_rsbtbl[b].lock); out: *r_ret = r; return error; } +/* During recovery, other nodes can send us new MSTCPY locks (from + dlm_recover_locks) before we've made ourself master (in + dlm_recover_masters). */ + +static int find_rsb_nodir(struct dlm_ls *ls, char *name, int len, + uint32_t hash, uint32_t b, + int dir_nodeid, int from_nodeid, + unsigned int flags, struct dlm_rsb **r_ret) +{ + struct dlm_rsb *r = NULL; + int our_nodeid = dlm_our_nodeid(); + int recover = (flags & R_RECEIVE_RECOVER); + int error; + + retry: + error = pre_rsb_struct(ls); + if (error < 0) + goto out; + + spin_lock(&ls->ls_rsbtbl[b].lock); + + error = dlm_search_rsb_tree(&ls->ls_rsbtbl[b].keep, name, len, &r); + if (error) + goto do_toss; + + /* + * rsb is active, so we can't check master_nodeid without lock_rsb. + */ + + kref_get(&r->res_ref); + goto out_unlock; + + + do_toss: + error = dlm_search_rsb_tree(&ls->ls_rsbtbl[b].toss, name, len, &r); + if (error) + goto do_new; + + /* + * rsb found inactive. No other thread is using this rsb because + * it's on the toss list, so we can look at or update + * res_master_nodeid without lock_rsb. + */ + + if (!recover && (r->res_master_nodeid != our_nodeid) && from_nodeid) { + /* our rsb is not master, and another node has sent us a + request; this should never happen */ + log_error(ls, "find_rsb toss from_nodeid %d master %d dir %d", + from_nodeid, r->res_master_nodeid, dir_nodeid); + dlm_print_rsb(r); + error = -ENOTBLK; + goto out_unlock; + } + + if (!recover && (r->res_master_nodeid != our_nodeid) && + (dir_nodeid == our_nodeid)) { + /* our rsb is not master, and we are dir; may as well fix it; + this should never happen */ + log_error(ls, "find_rsb toss our %d master %d dir %d", + our_nodeid, r->res_master_nodeid, dir_nodeid); + dlm_print_rsb(r); + r->res_master_nodeid = our_nodeid; + r->res_nodeid = 0; + } + + rb_erase(&r->res_hashnode, &ls->ls_rsbtbl[b].toss); + error = rsb_insert(r, &ls->ls_rsbtbl[b].keep); + goto out_unlock; + + + do_new: + /* + * rsb not found + */ + + error = get_rsb_struct(ls, name, len, &r); + if (error == -EAGAIN) { + spin_unlock(&ls->ls_rsbtbl[b].lock); + goto retry; + } + if (error) + goto out_unlock; + + r->res_hash = hash; + r->res_bucket = b; + r->res_dir_nodeid = dir_nodeid; + r->res_master_nodeid = dir_nodeid; + r->res_nodeid = (dir_nodeid == our_nodeid) ? 0 : dir_nodeid; + kref_init(&r->res_ref); + + error = rsb_insert(r, &ls->ls_rsbtbl[b].keep); + out_unlock: + spin_unlock(&ls->ls_rsbtbl[b].lock); + out: + *r_ret = r; + return error; +} + +static int find_rsb(struct dlm_ls *ls, char *name, int len, int from_nodeid, + unsigned int flags, struct dlm_rsb **r_ret) +{ + uint32_t hash, b; + int dir_nodeid; + + if (len > DLM_RESNAME_MAXLEN) + return -EINVAL; + + hash = jhash(name, len, 0); + b = hash & (ls->ls_rsbtbl_size - 1); + + dir_nodeid = dlm_hash2nodeid(ls, hash); + + if (dlm_no_directory(ls)) + return find_rsb_nodir(ls, name, len, hash, b, dir_nodeid, + from_nodeid, flags, r_ret); + else + return find_rsb_dir(ls, name, len, hash, b, dir_nodeid, + from_nodeid, flags, r_ret); +} + +/* we have received a request and found that res_master_nodeid != our_nodeid, + so we need to return an error or make ourself the master */ + +static int validate_master_nodeid(struct dlm_ls *ls, struct dlm_rsb *r, + int from_nodeid) +{ + if (dlm_no_directory(ls)) { + log_error(ls, "find_rsb keep from_nodeid %d master %d dir %d", + from_nodeid, r->res_master_nodeid, + r->res_dir_nodeid); + dlm_print_rsb(r); + return -ENOTBLK; + } + + if (from_nodeid != r->res_dir_nodeid) { + /* our rsb is not master, and another node (not the dir node) + has sent us a request. this is much more common when our + master_nodeid is zero, so limit debug to non-zero. */ + + if (r->res_master_nodeid) { + log_debug(ls, "validate master from_other %d master %d " + "dir %d first %x %s", from_nodeid, + r->res_master_nodeid, r->res_dir_nodeid, + r->res_first_lkid, r->res_name); + } + return -ENOTBLK; + } else { + /* our rsb is not master, but the dir nodeid has sent us a + request; this could happen with master 0 / res_nodeid -1 */ + + if (r->res_master_nodeid) { + log_error(ls, "validate master from_dir %d master %d " + "first %x %s", + from_nodeid, r->res_master_nodeid, + r->res_first_lkid, r->res_name); + } + + r->res_master_nodeid = dlm_our_nodeid(); + r->res_nodeid = 0; + return 0; + } +} + /* - * Find rsb in rsbtbl and potentially create/add one + * We're the dir node for this res and another node wants to know the + * master nodeid. During normal operation (non recovery) this is only + * called from receive_lookup(); master lookups when the local node is + * the dir node are done by find_rsb(). * - * Delaying the release of rsb's has a similar benefit to applications keeping - * NL locks on an rsb, but without the guarantee that the cached master value - * will still be valid when the rsb is reused. Apps aren't always smart enough - * to keep NL locks on an rsb that they may lock again shortly; this can lead - * to excessive master lookups and removals if we don't delay the release. + * normal operation, we are the dir node for a resource + * . _request_lock + * . set_master + * . send_lookup + * . receive_lookup + * . dlm_master_lookup flags 0 * - * Searching for an rsb means looking through both the normal list and toss - * list. When found on the toss list the rsb is moved to the normal list with - * ref count of 1; when found on normal list the ref count is incremented. + * recover directory, we are rebuilding dir for all resources + * . dlm_recover_directory + * . dlm_rcom_names + * remote node sends back the rsb names it is master of and we are dir of + * . dlm_master_lookup RECOVER_DIR (fix_master 0, from_master 1) + * we either create new rsb setting remote node as master, or find existing + * rsb and set master to be the remote node. + * + * recover masters, we are finding the new master for resources + * . dlm_recover_masters + * . recover_master + * . dlm_send_rcom_lookup + * . receive_rcom_lookup + * . dlm_master_lookup RECOVER_MASTER (fix_master 1, from_master 0) */ -static int find_rsb(struct dlm_ls *ls, char *name, int namelen, - unsigned int flags, struct dlm_rsb **r_ret) +int dlm_master_lookup(struct dlm_ls *ls, int from_nodeid, char *name, int len, + unsigned int flags, int *r_nodeid, int *result) { struct dlm_rsb *r = NULL; - uint32_t hash, bucket; - int error; + uint32_t hash, b; + int from_master = (flags & DLM_LU_RECOVER_DIR); + int fix_master = (flags & DLM_LU_RECOVER_MASTER); + int our_nodeid = dlm_our_nodeid(); + int dir_nodeid, error, toss_list = 0; - if (namelen > DLM_RESNAME_MAXLEN) { - error = -EINVAL; - goto out; + if (len > DLM_RESNAME_MAXLEN) + return -EINVAL; + + if (from_nodeid == our_nodeid) { + log_error(ls, "dlm_master_lookup from our_nodeid %d flags %x", + our_nodeid, flags); + return -EINVAL; } - if (dlm_no_directory(ls)) - flags |= R_CREATE; + hash = jhash(name, len, 0); + b = hash & (ls->ls_rsbtbl_size - 1); - hash = jhash(name, namelen, 0); - bucket = hash & (ls->ls_rsbtbl_size - 1); + dir_nodeid = dlm_hash2nodeid(ls, hash); + if (dir_nodeid != our_nodeid) { + log_error(ls, "dlm_master_lookup from %d dir %d our %d h %x %d", + from_nodeid, dir_nodeid, our_nodeid, hash, + ls->ls_num_nodes); + *r_nodeid = -1; + return -EINVAL; + } retry: - if (flags & R_CREATE) { - error = pre_rsb_struct(ls); - if (error < 0) - goto out; + error = pre_rsb_struct(ls); + if (error < 0) + return error; + + spin_lock(&ls->ls_rsbtbl[b].lock); + error = dlm_search_rsb_tree(&ls->ls_rsbtbl[b].keep, name, len, &r); + if (!error) { + /* because the rsb is active, we need to lock_rsb before + checking/changing re_master_nodeid */ + + hold_rsb(r); + spin_unlock(&ls->ls_rsbtbl[b].lock); + lock_rsb(r); + goto found; } - spin_lock(&ls->ls_rsbtbl[bucket].lock); + error = dlm_search_rsb_tree(&ls->ls_rsbtbl[b].toss, name, len, &r); + if (error) + goto not_found; - error = _search_rsb(ls, name, namelen, bucket, flags, &r); - if (!error) - goto out_unlock; + /* because the rsb is inactive (on toss list), it's not refcounted + and lock_rsb is not used, but is protected by the rsbtbl lock */ - if (error == -EBADR && !(flags & R_CREATE)) - goto out_unlock; + toss_list = 1; + found: + if (r->res_dir_nodeid != our_nodeid) { + /* should not happen, but may as well fix it and carry on */ + log_error(ls, "dlm_master_lookup res_dir %d our %d %s", + r->res_dir_nodeid, our_nodeid, r->res_name); + r->res_dir_nodeid = our_nodeid; + } + + if (fix_master && dlm_is_removed(ls, r->res_master_nodeid)) { + /* Recovery uses this function to set a new master when + the previous master failed. Setting NEW_MASTER will + force dlm_recover_masters to call recover_master on this + rsb even though the res_nodeid is no longer removed. */ + + r->res_master_nodeid = from_nodeid; + r->res_nodeid = from_nodeid; + rsb_set_flag(r, RSB_NEW_MASTER); + + if (toss_list) { + /* I don't think we should ever find it on toss list. */ + log_error(ls, "dlm_master_lookup fix_master on toss"); + dlm_dump_rsb(r); + } + } - /* the rsb was found but wasn't a master copy */ - if (error == -ENOTBLK) - goto out_unlock; + if (from_master && (r->res_master_nodeid != from_nodeid)) { + /* this will happen if from_nodeid became master during + a previous recovery cycle, and we aborted the previous + cycle before recovering this master value */ - error = get_rsb_struct(ls, name, namelen, &r); + log_limit(ls, "dlm_master_lookup from_master %d " + "master_nodeid %d res_nodeid %d first %x %s", + from_nodeid, r->res_master_nodeid, r->res_nodeid, + r->res_first_lkid, r->res_name); + + if (r->res_master_nodeid == our_nodeid) { + log_error(ls, "from_master %d our_master", from_nodeid); + dlm_dump_rsb(r); + dlm_send_rcom_lookup_dump(r, from_nodeid); + goto out_found; + } + + r->res_master_nodeid = from_nodeid; + r->res_nodeid = from_nodeid; + rsb_set_flag(r, RSB_NEW_MASTER); + } + + if (!r->res_master_nodeid) { + /* this will happen if recovery happens while we're looking + up the master for this rsb */ + + log_debug(ls, "dlm_master_lookup master 0 to %d first %x %s", + from_nodeid, r->res_first_lkid, r->res_name); + r->res_master_nodeid = from_nodeid; + r->res_nodeid = from_nodeid; + } + + if (!from_master && !fix_master && + (r->res_master_nodeid == from_nodeid)) { + /* this can happen when the master sends remove, the dir node + finds the rsb on the keep list and ignores the remove, + and the former master sends a lookup */ + + log_limit(ls, "dlm_master_lookup from master %d flags %x " + "first %x %s", from_nodeid, flags, + r->res_first_lkid, r->res_name); + } + + out_found: + *r_nodeid = r->res_master_nodeid; + if (result) + *result = DLM_LU_MATCH; + + if (toss_list) { + r->res_toss_time = jiffies; + /* the rsb was inactive (on toss list) */ + spin_unlock(&ls->ls_rsbtbl[b].lock); + } else { + /* the rsb was active */ + unlock_rsb(r); + put_rsb(r); + } + return 0; + + not_found: + error = get_rsb_struct(ls, name, len, &r); if (error == -EAGAIN) { - spin_unlock(&ls->ls_rsbtbl[bucket].lock); + spin_unlock(&ls->ls_rsbtbl[b].lock); goto retry; } if (error) goto out_unlock; r->res_hash = hash; - r->res_bucket = bucket; - r->res_nodeid = -1; + r->res_bucket = b; + r->res_dir_nodeid = our_nodeid; + r->res_master_nodeid = from_nodeid; + r->res_nodeid = from_nodeid; kref_init(&r->res_ref); + r->res_toss_time = jiffies; - /* With no directory, the master can be set immediately */ - if (dlm_no_directory(ls)) { - int nodeid = dlm_dir_nodeid(r); - if (nodeid == dlm_our_nodeid()) - nodeid = 0; - r->res_nodeid = nodeid; + error = rsb_insert(r, &ls->ls_rsbtbl[b].toss); + if (error) { + /* should never happen */ + dlm_free_rsb(r); + spin_unlock(&ls->ls_rsbtbl[b].lock); + goto retry; } - error = rsb_insert(r, &ls->ls_rsbtbl[bucket].keep); + + if (result) + *result = DLM_LU_ADD; + *r_nodeid = from_nodeid; + error = 0; out_unlock: - spin_unlock(&ls->ls_rsbtbl[bucket].lock); - out: - *r_ret = r; + spin_unlock(&ls->ls_rsbtbl[b].lock); return error; } @@ -605,17 +1099,27 @@ static void dlm_dump_rsb_hash(struct dlm_ls *ls, uint32_t hash) } } -/* This is only called to add a reference when the code already holds - a valid reference to the rsb, so there's no need for locking. */ - -static inline void hold_rsb(struct dlm_rsb *r) +void dlm_dump_rsb_name(struct dlm_ls *ls, char *name, int len) { - kref_get(&r->res_ref); -} + struct dlm_rsb *r = NULL; + uint32_t hash, b; + int error; -void dlm_hold_rsb(struct dlm_rsb *r) -{ - hold_rsb(r); + hash = jhash(name, len, 0); + b = hash & (ls->ls_rsbtbl_size - 1); + + spin_lock(&ls->ls_rsbtbl[b].lock); + error = dlm_search_rsb_tree(&ls->ls_rsbtbl[b].keep, name, len, &r); + if (!error) + goto out_dump; + + error = dlm_search_rsb_tree(&ls->ls_rsbtbl[b].toss, name, len, &r); + if (error) + goto out; + out_dump: + dlm_dump_rsb(r); + out: + spin_unlock(&ls->ls_rsbtbl[b].lock); } static void toss_rsb(struct kref *kref) @@ -634,24 +1138,6 @@ static void toss_rsb(struct kref *kref) } } -/* When all references to the rsb are gone it's transferred to - the tossed list for later disposal. */ - -static void put_rsb(struct dlm_rsb *r) -{ - struct dlm_ls *ls = r->res_ls; - uint32_t bucket = r->res_bucket; - - spin_lock(&ls->ls_rsbtbl[bucket].lock); - kref_put(&r->res_ref, toss_rsb); - spin_unlock(&ls->ls_rsbtbl[bucket].lock); -} - -void dlm_put_rsb(struct dlm_rsb *r) -{ - put_rsb(r); -} - /* See comment for unhold_lkb */ static void unhold_rsb(struct dlm_rsb *r) @@ -1138,27 +1624,13 @@ static int remove_from_waiters_ms(struct dlm_lkb *lkb, struct dlm_message *ms) return error; } -static void dir_remove(struct dlm_rsb *r) -{ - int to_nodeid; - - if (dlm_no_directory(r->res_ls)) - return; - - to_nodeid = dlm_dir_nodeid(r); - if (to_nodeid != dlm_our_nodeid()) - send_remove(r); - else - dlm_dir_remove_entry(r->res_ls, to_nodeid, - r->res_name, r->res_length); -} - /* FIXME: make this more efficient */ static int shrink_bucket(struct dlm_ls *ls, int b) { struct rb_node *n; struct dlm_rsb *r; + int our_nodeid = dlm_our_nodeid(); int count = 0, found; for (;;) { @@ -1166,6 +1638,17 @@ static int shrink_bucket(struct dlm_ls *ls, int b) spin_lock(&ls->ls_rsbtbl[b].lock); for (n = rb_first(&ls->ls_rsbtbl[b].toss); n; n = rb_next(n)) { r = rb_entry(n, struct dlm_rsb, res_hashnode); + + /* If we're the directory record for this rsb, and + we're not the master of it, then we need to wait + for the master node to send us a dir remove for + before removing the dir record. */ + + if (!dlm_no_directory(ls) && !is_master(r) && + (dlm_dir_nodeid(r) == our_nodeid)) { + continue; + } + if (!time_after_eq(jiffies, r->res_toss_time + dlm_config.ci_toss_secs * HZ)) continue; @@ -1182,8 +1665,15 @@ static int shrink_bucket(struct dlm_ls *ls, int b) rb_erase(&r->res_hashnode, &ls->ls_rsbtbl[b].toss); spin_unlock(&ls->ls_rsbtbl[b].lock); - if (is_master(r)) - dir_remove(r); + /* We're the master of this rsb but we're not + the directory record, so we need to tell the + dir node to remove the dir record. */ + + if (!dlm_no_directory(ls) && is_master(r) && + (dlm_dir_nodeid(r) != our_nodeid)) { + send_remove(r); + } + dlm_free_rsb(r); count++; } else { @@ -2078,8 +2568,7 @@ static void send_blocking_asts_all(struct dlm_rsb *r, struct dlm_lkb *lkb) static int set_master(struct dlm_rsb *r, struct dlm_lkb *lkb) { - struct dlm_ls *ls = r->res_ls; - int i, error, dir_nodeid, ret_nodeid, our_nodeid = dlm_our_nodeid(); + int our_nodeid = dlm_our_nodeid(); if (rsb_flag(r, RSB_MASTER_UNCERTAIN)) { rsb_clear_flag(r, RSB_MASTER_UNCERTAIN); @@ -2093,53 +2582,35 @@ static int set_master(struct dlm_rsb *r, struct dlm_lkb *lkb) return 1; } - if (r->res_nodeid == 0) { + if (r->res_master_nodeid == our_nodeid) { lkb->lkb_nodeid = 0; return 0; } - if (r->res_nodeid > 0) { - lkb->lkb_nodeid = r->res_nodeid; + if (r->res_master_nodeid) { + lkb->lkb_nodeid = r->res_master_nodeid; return 0; } - DLM_ASSERT(r->res_nodeid == -1, dlm_dump_rsb(r);); - - dir_nodeid = dlm_dir_nodeid(r); - - if (dir_nodeid != our_nodeid) { - r->res_first_lkid = lkb->lkb_id; - send_lookup(r, lkb); - return 1; - } - - for (i = 0; i < 2; i++) { - /* It's possible for dlm_scand to remove an old rsb for - this same resource from the toss list, us to create - a new one, look up the master locally, and find it - already exists just before dlm_scand does the - dir_remove() on the previous rsb. */ - - error = dlm_dir_lookup(ls, our_nodeid, r->res_name, - r->res_length, &ret_nodeid); - if (!error) - break; - log_debug(ls, "dir_lookup error %d %s", error, r->res_name); - schedule(); - } - if (error && error != -EEXIST) - return error; - - if (ret_nodeid == our_nodeid) { - r->res_first_lkid = 0; + if (dlm_dir_nodeid(r) == our_nodeid) { + /* This is a somewhat unusual case; find_rsb will usually + have set res_master_nodeid when dir nodeid is local, but + there are cases where we become the dir node after we've + past find_rsb and go through _request_lock again. + confirm_master() or process_lookup_list() needs to be + called after this. */ + log_debug(r->res_ls, "set_master %x self master %d dir %d %s", + lkb->lkb_id, r->res_master_nodeid, r->res_dir_nodeid, + r->res_name); + r->res_master_nodeid = our_nodeid; r->res_nodeid = 0; lkb->lkb_nodeid = 0; - } else { - r->res_first_lkid = lkb->lkb_id; - r->res_nodeid = ret_nodeid; - lkb->lkb_nodeid = ret_nodeid; + return 0; } - return 0; + + r->res_first_lkid = lkb->lkb_id; + send_lookup(r, lkb); + return 1; } static void process_lookup_list(struct dlm_rsb *r) @@ -2584,7 +3055,7 @@ static void do_unlock_effects(struct dlm_rsb *r, struct dlm_lkb *lkb, } /* returns: 0 did nothing, -DLM_ECANCEL canceled lock */ - + static int do_cancel(struct dlm_rsb *r, struct dlm_lkb *lkb) { int error; @@ -2708,11 +3179,11 @@ static int request_lock(struct dlm_ls *ls, struct dlm_lkb *lkb, char *name, error = validate_lock_args(ls, lkb, args); if (error) - goto out; + return error; - error = find_rsb(ls, name, len, R_CREATE, &r); + error = find_rsb(ls, name, len, 0, R_REQUEST, &r); if (error) - goto out; + return error; lock_rsb(r); @@ -2723,8 +3194,6 @@ static int request_lock(struct dlm_ls *ls, struct dlm_lkb *lkb, char *name, unlock_rsb(r); put_rsb(r); - - out: return error; } @@ -3406,8 +3875,11 @@ static int receive_request(struct dlm_ls *ls, struct dlm_message *ms) { struct dlm_lkb *lkb; struct dlm_rsb *r; + int from_nodeid; int error, namelen; + from_nodeid = ms->m_header.h_nodeid; + error = create_lkb(ls, &lkb); if (error) goto fail; @@ -3420,9 +3892,16 @@ static int receive_request(struct dlm_ls *ls, struct dlm_message *ms) goto fail; } + /* The dir node is the authority on whether we are the master + for this rsb or not, so if the master sends us a request, we should + recreate the rsb if we've destroyed it. This race happens when we + send a remove message to the dir node at the same time that the dir + node sends us a request for the rsb. */ + namelen = receive_extralen(ms); - error = find_rsb(ls, ms->m_extra, namelen, R_MASTER, &r); + error = find_rsb(ls, ms->m_extra, namelen, from_nodeid, + R_RECEIVE_REQUEST, &r); if (error) { __put_lkb(ls, lkb); goto fail; @@ -3430,6 +3909,16 @@ static int receive_request(struct dlm_ls *ls, struct dlm_message *ms) lock_rsb(r); + if (r->res_master_nodeid != dlm_our_nodeid()) { + error = validate_master_nodeid(ls, r, from_nodeid); + if (error) { + unlock_rsb(r); + put_rsb(r); + __put_lkb(ls, lkb); + goto fail; + } + } + attach_lkb(r, lkb); error = do_request(r, lkb); send_request_reply(r, lkb, error); @@ -3445,6 +3934,23 @@ static int receive_request(struct dlm_ls *ls, struct dlm_message *ms) return 0; fail: + /* TODO: instead of returning ENOTBLK, add the lkb to res_lookup + and do this receive_request again from process_lookup_list once + we get the lookup reply. This would avoid a many repeated + ENOTBLK request failures when the lookup reply designating us + as master is delayed. */ + + /* We could repeatedly return -EBADR here if our send_remove() is + delayed in being sent/arriving/being processed on the dir node. + Another node would repeatedly lookup up the master, and the dir + node would continue returning our nodeid until our send_remove + took effect. */ + + if (error != -ENOTBLK) { + log_limit(ls, "receive_request %x from %d %d", + ms->m_lkid, from_nodeid, error); + } + setup_stub_lkb(ls, ms); send_request_reply(&ls->ls_stub_rsb, &ls->ls_stub_lkb, error); return error; @@ -3651,49 +4157,110 @@ static int receive_bast(struct dlm_ls *ls, struct dlm_message *ms) static void receive_lookup(struct dlm_ls *ls, struct dlm_message *ms) { - int len, error, ret_nodeid, dir_nodeid, from_nodeid, our_nodeid; + int len, error, ret_nodeid, from_nodeid, our_nodeid; from_nodeid = ms->m_header.h_nodeid; our_nodeid = dlm_our_nodeid(); len = receive_extralen(ms); - dir_nodeid = dlm_hash2nodeid(ls, ms->m_hash); - if (dir_nodeid != our_nodeid) { - log_error(ls, "lookup dir_nodeid %d from %d", - dir_nodeid, from_nodeid); - error = -EINVAL; - ret_nodeid = -1; - goto out; - } - - error = dlm_dir_lookup(ls, from_nodeid, ms->m_extra, len, &ret_nodeid); + error = dlm_master_lookup(ls, from_nodeid, ms->m_extra, len, 0, + &ret_nodeid, NULL); /* Optimization: we're master so treat lookup as a request */ if (!error && ret_nodeid == our_nodeid) { receive_request(ls, ms); return; } - out: send_lookup_reply(ls, ms, ret_nodeid, error); } static void receive_remove(struct dlm_ls *ls, struct dlm_message *ms) { - int len, dir_nodeid, from_nodeid; + char name[DLM_RESNAME_MAXLEN+1]; + struct dlm_rsb *r; + uint32_t hash, b; + int rv, len, dir_nodeid, from_nodeid; from_nodeid = ms->m_header.h_nodeid; len = receive_extralen(ms); + if (len > DLM_RESNAME_MAXLEN) { + log_error(ls, "receive_remove from %d bad len %d", + from_nodeid, len); + return; + } + dir_nodeid = dlm_hash2nodeid(ls, ms->m_hash); if (dir_nodeid != dlm_our_nodeid()) { - log_error(ls, "remove dir entry dir_nodeid %d from %d", - dir_nodeid, from_nodeid); + log_error(ls, "receive_remove from %d bad nodeid %d", + from_nodeid, dir_nodeid); return; } - dlm_dir_remove_entry(ls, from_nodeid, ms->m_extra, len); + /* Look for name on rsbtbl.toss, if it's there, kill it. + If it's on rsbtbl.keep, it's being used, and we should ignore this + message. This is an expected race between the dir node sending a + request to the master node at the same time as the master node sends + a remove to the dir node. The resolution to that race is for the + dir node to ignore the remove message, and the master node to + recreate the master rsb when it gets a request from the dir node for + an rsb it doesn't have. */ + + memset(name, 0, sizeof(name)); + memcpy(name, ms->m_extra, len); + + hash = jhash(name, len, 0); + b = hash & (ls->ls_rsbtbl_size - 1); + + spin_lock(&ls->ls_rsbtbl[b].lock); + + rv = dlm_search_rsb_tree(&ls->ls_rsbtbl[b].toss, name, len, &r); + if (rv) { + /* verify the rsb is on keep list per comment above */ + rv = dlm_search_rsb_tree(&ls->ls_rsbtbl[b].keep, name, len, &r); + if (rv) { + /* should not happen */ + log_error(ls, "receive_remove from %d not found %s", + from_nodeid, name); + spin_unlock(&ls->ls_rsbtbl[b].lock); + return; + } + if (r->res_master_nodeid != from_nodeid) { + /* should not happen */ + log_error(ls, "receive_remove keep from %d master %d", + from_nodeid, r->res_master_nodeid); + dlm_print_rsb(r); + spin_unlock(&ls->ls_rsbtbl[b].lock); + return; + } + + log_debug(ls, "receive_remove from %d master %d first %x %s", + from_nodeid, r->res_master_nodeid, r->res_first_lkid, + name); + spin_unlock(&ls->ls_rsbtbl[b].lock); + return; + } + + if (r->res_master_nodeid != from_nodeid) { + log_error(ls, "receive_remove toss from %d master %d", + from_nodeid, r->res_master_nodeid); + dlm_print_rsb(r); + spin_unlock(&ls->ls_rsbtbl[b].lock); + return; + } + + if (kref_put(&r->res_ref, kill_rsb)) { + rb_erase(&r->res_hashnode, &ls->ls_rsbtbl[b].toss); + spin_unlock(&ls->ls_rsbtbl[b].lock); + dlm_free_rsb(r); + } else { + log_error(ls, "receive_remove from %d rsb ref error", + from_nodeid); + dlm_print_rsb(r); + spin_unlock(&ls->ls_rsbtbl[b].lock); + } } static void receive_purge(struct dlm_ls *ls, struct dlm_message *ms) @@ -3706,6 +4273,7 @@ static int receive_request_reply(struct dlm_ls *ls, struct dlm_message *ms) struct dlm_lkb *lkb; struct dlm_rsb *r; int error, mstype, result; + int from_nodeid = ms->m_header.h_nodeid; error = find_lkb(ls, ms->m_remid, &lkb); if (error) @@ -3723,8 +4291,7 @@ static int receive_request_reply(struct dlm_ls *ls, struct dlm_message *ms) error = remove_from_waiters(lkb, DLM_MSG_REQUEST_REPLY); if (error) { log_error(ls, "receive_request_reply %x remote %d %x result %d", - lkb->lkb_id, ms->m_header.h_nodeid, ms->m_lkid, - ms->m_result); + lkb->lkb_id, from_nodeid, ms->m_lkid, ms->m_result); dlm_dump_rsb(r); goto out; } @@ -3732,8 +4299,9 @@ static int receive_request_reply(struct dlm_ls *ls, struct dlm_message *ms) /* Optimization: the dir node was also the master, so it took our lookup as a request and sent request reply instead of lookup reply */ if (mstype == DLM_MSG_LOOKUP) { - r->res_nodeid = ms->m_header.h_nodeid; - lkb->lkb_nodeid = r->res_nodeid; + r->res_master_nodeid = from_nodeid; + r->res_nodeid = from_nodeid; + lkb->lkb_nodeid = from_nodeid; } /* this is the value returned from do_request() on the master */ @@ -3767,18 +4335,30 @@ static int receive_request_reply(struct dlm_ls *ls, struct dlm_message *ms) case -EBADR: case -ENOTBLK: /* find_rsb failed to find rsb or rsb wasn't master */ - log_debug(ls, "receive_request_reply %x %x master diff %d %d", - lkb->lkb_id, lkb->lkb_flags, r->res_nodeid, result); - r->res_nodeid = -1; - lkb->lkb_nodeid = -1; + log_limit(ls, "receive_request_reply %x from %d %d " + "master %d dir %d first %x %s", lkb->lkb_id, + from_nodeid, result, r->res_master_nodeid, + r->res_dir_nodeid, r->res_first_lkid, r->res_name); + + if (r->res_dir_nodeid != dlm_our_nodeid() && + r->res_master_nodeid != dlm_our_nodeid()) { + /* cause _request_lock->set_master->send_lookup */ + r->res_master_nodeid = 0; + r->res_nodeid = -1; + lkb->lkb_nodeid = -1; + } if (is_overlap(lkb)) { /* we'll ignore error in cancel/unlock reply */ queue_cast_overlap(r, lkb); confirm_master(r, result); unhold_lkb(lkb); /* undoes create_lkb() */ - } else + } else { _request_lock(r, lkb); + + if (r->res_master_nodeid == dlm_our_nodeid()) + confirm_master(r, 0); + } break; default: @@ -3994,6 +4574,7 @@ static void receive_lookup_reply(struct dlm_ls *ls, struct dlm_message *ms) struct dlm_lkb *lkb; struct dlm_rsb *r; int error, ret_nodeid; + int do_lookup_list = 0; error = find_lkb(ls, ms->m_lkid, &lkb); if (error) { @@ -4001,7 +4582,7 @@ static void receive_lookup_reply(struct dlm_ls *ls, struct dlm_message *ms) return; } - /* ms->m_result is the value returned by dlm_dir_lookup on dir node + /* ms->m_result is the value returned by dlm_master_lookup on dir node FIXME: will a non-zero error ever be returned? */ r = lkb->lkb_resource; @@ -4013,12 +4594,37 @@ static void receive_lookup_reply(struct dlm_ls *ls, struct dlm_message *ms) goto out; ret_nodeid = ms->m_nodeid; + + /* We sometimes receive a request from the dir node for this + rsb before we've received the dir node's loookup_reply for it. + The request from the dir node implies we're the master, so we set + ourself as master in receive_request_reply, and verify here that + we are indeed the master. */ + + if (r->res_master_nodeid && (r->res_master_nodeid != ret_nodeid)) { + /* This should never happen */ + log_error(ls, "receive_lookup_reply %x from %d ret %d " + "master %d dir %d our %d first %x %s", + lkb->lkb_id, ms->m_header.h_nodeid, ret_nodeid, + r->res_master_nodeid, r->res_dir_nodeid, + dlm_our_nodeid(), r->res_first_lkid, r->res_name); + } + if (ret_nodeid == dlm_our_nodeid()) { + r->res_master_nodeid = ret_nodeid; r->res_nodeid = 0; - ret_nodeid = 0; + do_lookup_list = 1; r->res_first_lkid = 0; + } else if (ret_nodeid == -1) { + /* the remote node doesn't believe it's the dir node */ + log_error(ls, "receive_lookup_reply %x from %d bad ret_nodeid", + lkb->lkb_id, ms->m_header.h_nodeid); + r->res_master_nodeid = 0; + r->res_nodeid = -1; + lkb->lkb_nodeid = -1; } else { - /* set_master() will copy res_nodeid to lkb_nodeid */ + /* set_master() will set lkb_nodeid from r */ + r->res_master_nodeid = ret_nodeid; r->res_nodeid = ret_nodeid; } @@ -4033,7 +4639,7 @@ static void receive_lookup_reply(struct dlm_ls *ls, struct dlm_message *ms) _request_lock(r, lkb); out_list: - if (!ret_nodeid) + if (do_lookup_list) process_lookup_list(r); out: unlock_rsb(r); @@ -4047,7 +4653,7 @@ static void _receive_message(struct dlm_ls *ls, struct dlm_message *ms, int error = 0, noent = 0; if (!dlm_is_member(ls, ms->m_header.h_nodeid)) { - log_debug(ls, "ignore non-member message %d from %d %x %x %d", + log_limit(ls, "receive %d from non-member %d %x %x %d", ms->m_type, ms->m_header.h_nodeid, ms->m_lkid, ms->m_remid, ms->m_result); return; @@ -4174,6 +4780,15 @@ static void dlm_receive_message(struct dlm_ls *ls, struct dlm_message *ms, int nodeid) { if (dlm_locking_stopped(ls)) { + /* If we were a member of this lockspace, left, and rejoined, + other nodes may still be sending us messages from the + lockspace generation before we left. */ + if (!ls->ls_generation) { + log_limit(ls, "receive %d from %d ignore old gen", + ms->m_type, nodeid); + return; + } + dlm_add_requestqueue(ls, nodeid, ms); } else { dlm_wait_requestqueue(ls); @@ -4798,6 +5413,7 @@ int dlm_recover_master_copy(struct dlm_ls *ls, struct dlm_rcom *rc) struct dlm_rsb *r; struct dlm_lkb *lkb; uint32_t remid = 0; + int from_nodeid = rc->rc_header.h_nodeid; int error; if (rl->rl_parent_lkid) { @@ -4815,21 +5431,21 @@ int dlm_recover_master_copy(struct dlm_ls *ls, struct dlm_rcom *rc) we make ourselves master, dlm_recover_masters() won't touch the MSTCPY locks we've received early. */ - error = find_rsb(ls, rl->rl_name, le16_to_cpu(rl->rl_namelen), 0, &r); + error = find_rsb(ls, rl->rl_name, le16_to_cpu(rl->rl_namelen), + from_nodeid, R_RECEIVE_RECOVER, &r); if (error) goto out; + lock_rsb(r); + if (dlm_no_directory(ls) && (dlm_dir_nodeid(r) != dlm_our_nodeid())) { log_error(ls, "dlm_recover_master_copy remote %d %x not dir", - rc->rc_header.h_nodeid, remid); + from_nodeid, remid); error = -EBADR; - put_rsb(r); - goto out; + goto out_unlock; } - lock_rsb(r); - - lkb = search_remid(r, rc->rc_header.h_nodeid, remid); + lkb = search_remid(r, from_nodeid, remid); if (lkb) { error = -EEXIST; goto out_remid; @@ -4866,7 +5482,7 @@ int dlm_recover_master_copy(struct dlm_ls *ls, struct dlm_rcom *rc) out: if (error && error != -EEXIST) log_debug(ls, "dlm_recover_master_copy remote %d %x error %d", - rc->rc_header.h_nodeid, remid, error); + from_nodeid, remid, error); rl->rl_result = cpu_to_le32(error); return error; } diff --git a/fs/dlm/lock.h b/fs/dlm/lock.h index c8b226c..5e0c72e 100644 --- a/fs/dlm/lock.h +++ b/fs/dlm/lock.h @@ -14,6 +14,7 @@ #define __LOCK_DOT_H__ void dlm_dump_rsb(struct dlm_rsb *r); +void dlm_dump_rsb_name(struct dlm_ls *ls, char *name, int len); void dlm_print_lkb(struct dlm_lkb *lkb); void dlm_receive_message_saved(struct dlm_ls *ls, struct dlm_message *ms, uint32_t saved_seq); @@ -28,9 +29,11 @@ void dlm_unlock_recovery(struct dlm_ls *ls); void dlm_scan_waiters(struct dlm_ls *ls); void dlm_scan_timeout(struct dlm_ls *ls); void dlm_adjust_timeouts(struct dlm_ls *ls); +int dlm_master_lookup(struct dlm_ls *ls, int nodeid, char *name, int len, + unsigned int flags, int *r_nodeid, int *result); int dlm_search_rsb_tree(struct rb_root *tree, char *name, int len, - unsigned int flags, struct dlm_rsb **r_ret); + struct dlm_rsb **r_ret); void dlm_recover_purge(struct dlm_ls *ls); void dlm_purge_mstcpy_locks(struct dlm_rsb *r); diff --git a/fs/dlm/lockspace.c b/fs/dlm/lockspace.c index ca506abb..065bb75 100644 --- a/fs/dlm/lockspace.c +++ b/fs/dlm/lockspace.c @@ -509,17 +509,6 @@ static int new_lockspace(const char *name, const char *cluster, idr_init(&ls->ls_lkbidr); spin_lock_init(&ls->ls_lkbidr_spin); - size = dlm_config.ci_dirtbl_size; - ls->ls_dirtbl_size = size; - - ls->ls_dirtbl = vmalloc(sizeof(struct dlm_dirtable) * size); - if (!ls->ls_dirtbl) - goto out_lkbfree; - for (i = 0; i < size; i++) { - INIT_LIST_HEAD(&ls->ls_dirtbl[i].list); - spin_lock_init(&ls->ls_dirtbl[i].lock); - } - INIT_LIST_HEAD(&ls->ls_waiters); mutex_init(&ls->ls_waiters_mutex); INIT_LIST_HEAD(&ls->ls_orphans); @@ -567,7 +556,7 @@ static int new_lockspace(const char *name, const char *cluster, ls->ls_recover_buf = kmalloc(dlm_config.ci_buffer_size, GFP_NOFS); if (!ls->ls_recover_buf) - goto out_dirfree; + goto out_lkbfree; ls->ls_slot = 0; ls->ls_num_slots = 0; @@ -648,8 +637,6 @@ static int new_lockspace(const char *name, const char *cluster, list_del(&ls->ls_list); spin_unlock(&lslist_lock); kfree(ls->ls_recover_buf); - out_dirfree: - vfree(ls->ls_dirtbl); out_lkbfree: idr_destroy(&ls->ls_lkbidr); vfree(ls->ls_rsbtbl); @@ -779,13 +766,6 @@ static int release_lockspace(struct dlm_ls *ls, int force) kfree(ls->ls_recover_buf); /* - * Free direntry structs. - */ - - dlm_dir_clear(ls); - vfree(ls->ls_dirtbl); - - /* * Free all lkb's in idr */ @@ -826,7 +806,6 @@ static int release_lockspace(struct dlm_ls *ls, int force) dlm_purge_requestqueue(ls); kfree(ls->ls_recover_args); - dlm_clear_free_entries(ls); dlm_clear_members(ls); dlm_clear_members_gone(ls); kfree(ls->ls_node_array); diff --git a/fs/dlm/rcom.c b/fs/dlm/rcom.c index 64d3e2b..c8c298d 100644 --- a/fs/dlm/rcom.c +++ b/fs/dlm/rcom.c @@ -23,8 +23,6 @@ #include "memory.h" #include "lock.h" #include "util.h" -#include "member.h" - static int rcom_response(struct dlm_ls *ls) { @@ -275,19 +273,9 @@ int dlm_rcom_names(struct dlm_ls *ls, int nodeid, char *last_name, int last_len) struct dlm_rcom *rc; struct dlm_mhandle *mh; int error = 0; - int max_size = dlm_config.ci_buffer_size - sizeof(struct dlm_rcom); ls->ls_recover_nodeid = nodeid; - if (nodeid == dlm_our_nodeid()) { - ls->ls_recover_buf->rc_header.h_length = - dlm_config.ci_buffer_size; - dlm_copy_master_names(ls, last_name, last_len, - ls->ls_recover_buf->rc_buf, - max_size, nodeid); - goto out; - } - error = create_rcom(ls, nodeid, DLM_RCOM_NAMES, last_len, &rc, &mh); if (error) goto out; @@ -344,6 +332,25 @@ int dlm_send_rcom_lookup(struct dlm_rsb *r, int dir_nodeid) return error; } +int dlm_send_rcom_lookup_dump(struct dlm_rsb *r, int to_nodeid) +{ + struct dlm_rcom *rc; + struct dlm_mhandle *mh; + struct dlm_ls *ls = r->res_ls; + int error; + + error = create_rcom(ls, to_nodeid, DLM_RCOM_LOOKUP, r->res_length, + &rc, &mh); + if (error) + goto out; + memcpy(rc->rc_buf, r->res_name, r->res_length); + rc->rc_id = 0xFFFFFFFF; + + send_rcom(ls, mh, rc); + out: + return error; +} + static void receive_rcom_lookup(struct dlm_ls *ls, struct dlm_rcom *rc_in) { struct dlm_rcom *rc; @@ -355,7 +362,14 @@ static void receive_rcom_lookup(struct dlm_ls *ls, struct dlm_rcom *rc_in) if (error) return; - error = dlm_dir_lookup(ls, nodeid, rc_in->rc_buf, len, &ret_nodeid); + if (rc_in->rc_id == 0xFFFFFFFF) { + log_error(ls, "receive_rcom_lookup dump from %d", nodeid); + dlm_dump_rsb_name(ls, rc_in->rc_buf, len); + return; + } + + error = dlm_master_lookup(ls, nodeid, rc_in->rc_buf, len, + DLM_LU_RECOVER_MASTER, &ret_nodeid, NULL); if (error) ret_nodeid = error; rc->rc_result = ret_nodeid; @@ -486,17 +500,76 @@ int dlm_send_ls_not_ready(int nodeid, struct dlm_rcom *rc_in) return 0; } +/* + * Ignore messages for stage Y before we set + * recover_status bit for stage X: + * + * recover_status = 0 + * + * dlm_recover_members() + * - send nothing + * - recv nothing + * - ignore NAMES, NAMES_REPLY + * - ignore LOOKUP, LOOKUP_REPLY + * - ignore LOCK, LOCK_REPLY + * + * recover_status |= NODES + * + * dlm_recover_members_wait() + * + * dlm_recover_directory() + * - send NAMES + * - recv NAMES_REPLY + * - ignore LOOKUP, LOOKUP_REPLY + * - ignore LOCK, LOCK_REPLY + * + * recover_status |= DIR + * + * dlm_recover_directory_wait() + * + * dlm_recover_masters() + * - send LOOKUP + * - recv LOOKUP_REPLY + * + * dlm_recover_locks() + * - send LOCKS + * - recv LOCKS_REPLY + * + * recover_status |= LOCKS + * + * dlm_recover_locks_wait() + * + * recover_status |= DONE + */ + /* Called by dlm_recv; corresponds to dlm_receive_message() but special recovery-only comms are sent through here. */ void dlm_receive_rcom(struct dlm_ls *ls, struct dlm_rcom *rc, int nodeid) { int lock_size = sizeof(struct dlm_rcom) + sizeof(struct rcom_lock); - int stop, reply = 0, lock = 0; + int stop, reply = 0, names = 0, lookup = 0, lock = 0; uint32_t status; uint64_t seq; switch (rc->rc_type) { + case DLM_RCOM_STATUS_REPLY: + reply = 1; + break; + case DLM_RCOM_NAMES: + names = 1; + break; + case DLM_RCOM_NAMES_REPLY: + names = 1; + reply = 1; + break; + case DLM_RCOM_LOOKUP: + lookup = 1; + break; + case DLM_RCOM_LOOKUP_REPLY: + lookup = 1; + reply = 1; + break; case DLM_RCOM_LOCK: lock = 1; break; @@ -504,10 +577,6 @@ void dlm_receive_rcom(struct dlm_ls *ls, struct dlm_rcom *rc, int nodeid) lock = 1; reply = 1; break; - case DLM_RCOM_STATUS_REPLY: - case DLM_RCOM_NAMES_REPLY: - case DLM_RCOM_LOOKUP_REPLY: - reply = 1; }; spin_lock(&ls->ls_recover_lock); @@ -516,19 +585,17 @@ void dlm_receive_rcom(struct dlm_ls *ls, struct dlm_rcom *rc, int nodeid) seq = ls->ls_recover_seq; spin_unlock(&ls->ls_recover_lock); - if ((stop && (rc->rc_type != DLM_RCOM_STATUS)) || - (reply && (rc->rc_seq_reply != seq)) || - (lock && !(status & DLM_RS_DIR))) { - log_limit(ls, "dlm_receive_rcom ignore msg %d " - "from %d %llu %llu recover seq %llu sts %x gen %u", - rc->rc_type, - nodeid, - (unsigned long long)rc->rc_seq, - (unsigned long long)rc->rc_seq_reply, - (unsigned long long)seq, - status, ls->ls_generation); - goto out; - } + if (stop && (rc->rc_type != DLM_RCOM_STATUS)) + goto ignore; + + if (reply && (rc->rc_seq_reply != seq)) + goto ignore; + + if (!(status & DLM_RS_NODES) && (names || lookup || lock)) + goto ignore; + + if (!(status & DLM_RS_DIR) && (lookup || lock)) + goto ignore; switch (rc->rc_type) { case DLM_RCOM_STATUS: @@ -570,10 +637,20 @@ void dlm_receive_rcom(struct dlm_ls *ls, struct dlm_rcom *rc, int nodeid) default: log_error(ls, "receive_rcom bad type %d", rc->rc_type); } -out: + return; + +ignore: + log_limit(ls, "dlm_receive_rcom ignore msg %d " + "from %d %llu %llu recover seq %llu sts %x gen %u", + rc->rc_type, + nodeid, + (unsigned long long)rc->rc_seq, + (unsigned long long)rc->rc_seq_reply, + (unsigned long long)seq, + status, ls->ls_generation); return; Eshort: - log_error(ls, "recovery message %x from %d is too short", - rc->rc_type, nodeid); + log_error(ls, "recovery message %d from %d is too short", + rc->rc_type, nodeid); } diff --git a/fs/dlm/rcom.h b/fs/dlm/rcom.h index 206723a..f8e2434 100644 --- a/fs/dlm/rcom.h +++ b/fs/dlm/rcom.h @@ -17,6 +17,7 @@ int dlm_rcom_status(struct dlm_ls *ls, int nodeid, uint32_t status_flags); int dlm_rcom_names(struct dlm_ls *ls, int nodeid, char *last_name,int last_len); int dlm_send_rcom_lookup(struct dlm_rsb *r, int dir_nodeid); +int dlm_send_rcom_lookup_dump(struct dlm_rsb *r, int to_nodeid); int dlm_send_rcom_lock(struct dlm_rsb *r, struct dlm_lkb *lkb); void dlm_receive_rcom(struct dlm_ls *ls, struct dlm_rcom *rc, int nodeid); int dlm_send_ls_not_ready(int nodeid, struct dlm_rcom *rc_in); diff --git a/fs/dlm/recover.c b/fs/dlm/recover.c index 7554e4d..3c025fe 100644 --- a/fs/dlm/recover.c +++ b/fs/dlm/recover.c @@ -361,9 +361,8 @@ static void set_master_lkbs(struct dlm_rsb *r) * rsb's to consider. */ -static void set_new_master(struct dlm_rsb *r, int nodeid) +static void set_new_master(struct dlm_rsb *r) { - r->res_nodeid = nodeid; set_master_lkbs(r); rsb_set_flag(r, RSB_NEW_MASTER); rsb_set_flag(r, RSB_NEW_MASTER2); @@ -372,31 +371,48 @@ static void set_new_master(struct dlm_rsb *r, int nodeid) /* * We do async lookups on rsb's that need new masters. The rsb's * waiting for a lookup reply are kept on the recover_list. + * + * Another node recovering the master may have sent us a rcom lookup, + * and our dlm_master_lookup() set it as the new master, along with + * NEW_MASTER so that we'll recover it here (this implies dir_nodeid + * equals our_nodeid below). */ -static int recover_master(struct dlm_rsb *r) +static int recover_master(struct dlm_rsb *r, unsigned int *count) { struct dlm_ls *ls = r->res_ls; - int error, ret_nodeid; - int our_nodeid = dlm_our_nodeid(); - int dir_nodeid = dlm_dir_nodeid(r); + int our_nodeid, dir_nodeid; + int is_removed = 0; + int error; + + if (is_master(r)) + return 0; + + is_removed = dlm_is_removed(ls, r->res_nodeid); + + if (!is_removed && !rsb_flag(r, RSB_NEW_MASTER)) + return 0; + + our_nodeid = dlm_our_nodeid(); + dir_nodeid = dlm_dir_nodeid(r); if (dir_nodeid == our_nodeid) { - error = dlm_dir_lookup(ls, our_nodeid, r->res_name, - r->res_length, &ret_nodeid); - if (error) - log_error(ls, "recover dir lookup error %d", error); + if (is_removed) { + r->res_master_nodeid = our_nodeid; + r->res_nodeid = 0; + } - if (ret_nodeid == our_nodeid) - ret_nodeid = 0; - lock_rsb(r); - set_new_master(r, ret_nodeid); - unlock_rsb(r); + /* set master of lkbs to ourself when is_removed, or to + another new master which we set along with NEW_MASTER + in dlm_master_lookup */ + set_new_master(r); + error = 0; } else { recover_list_add(r); error = dlm_send_rcom_lookup(r, dir_nodeid); } + (*count)++; return error; } @@ -415,7 +431,7 @@ static int recover_master(struct dlm_rsb *r) * resent. */ -static int recover_master_static(struct dlm_rsb *r) +static int recover_master_static(struct dlm_rsb *r, unsigned int *count) { int dir_nodeid = dlm_dir_nodeid(r); int new_master = dir_nodeid; @@ -423,11 +439,12 @@ static int recover_master_static(struct dlm_rsb *r) if (dir_nodeid == dlm_our_nodeid()) new_master = 0; - lock_rsb(r); dlm_purge_mstcpy_locks(r); - set_new_master(r, new_master); - unlock_rsb(r); - return 1; + r->res_master_nodeid = dir_nodeid; + r->res_nodeid = new_master; + set_new_master(r); + (*count)++; + return 0; } /* @@ -443,7 +460,10 @@ static int recover_master_static(struct dlm_rsb *r) int dlm_recover_masters(struct dlm_ls *ls) { struct dlm_rsb *r; - int error = 0, count = 0; + unsigned int total = 0; + unsigned int count = 0; + int nodir = dlm_no_directory(ls); + int error; log_debug(ls, "dlm_recover_masters"); @@ -455,20 +475,23 @@ int dlm_recover_masters(struct dlm_ls *ls) goto out; } - if (dlm_no_directory(ls)) - count += recover_master_static(r); - else if (!is_master(r) && - (dlm_is_removed(ls, r->res_nodeid) || - rsb_flag(r, RSB_NEW_MASTER))) { - recover_master(r); - count++; - } + lock_rsb(r); + if (nodir) + error = recover_master_static(r, &count); + else + error = recover_master(r, &count); + unlock_rsb(r); + cond_resched(); + total++; - schedule(); + if (error) { + up_read(&ls->ls_root_sem); + goto out; + } } up_read(&ls->ls_root_sem); - log_debug(ls, "dlm_recover_masters %d resources", count); + log_debug(ls, "dlm_recover_masters %u of %u", count, total); error = dlm_wait_function(ls, &recover_list_empty); out: @@ -480,7 +503,7 @@ int dlm_recover_masters(struct dlm_ls *ls) int dlm_recover_master_reply(struct dlm_ls *ls, struct dlm_rcom *rc) { struct dlm_rsb *r; - int nodeid; + int ret_nodeid, new_master; r = recover_list_find(ls, rc->rc_id); if (!r) { @@ -489,12 +512,17 @@ int dlm_recover_master_reply(struct dlm_ls *ls, struct dlm_rcom *rc) goto out; } - nodeid = rc->rc_result; - if (nodeid == dlm_our_nodeid()) - nodeid = 0; + ret_nodeid = rc->rc_result; + + if (ret_nodeid == dlm_our_nodeid()) + new_master = 0; + else + new_master = ret_nodeid; lock_rsb(r); - set_new_master(r, nodeid); + r->res_master_nodeid = ret_nodeid; + r->res_nodeid = new_master; + set_new_master(r); unlock_rsb(r); recover_list_del(r); @@ -791,20 +819,8 @@ int dlm_create_root_list(struct dlm_ls *ls) dlm_hold_rsb(r); } - /* If we're using a directory, add tossed rsbs to the root - list; they'll have entries created in the new directory, - but no other recovery steps should do anything with them. */ - - if (dlm_no_directory(ls)) { - spin_unlock(&ls->ls_rsbtbl[i].lock); - continue; - } - - for (n = rb_first(&ls->ls_rsbtbl[i].toss); n; n = rb_next(n)) { - r = rb_entry(n, struct dlm_rsb, res_hashnode); - list_add(&r->res_root_list, &ls->ls_root_list); - dlm_hold_rsb(r); - } + if (!RB_EMPTY_ROOT(&ls->ls_rsbtbl[i].toss)) + log_error(ls, "dlm_create_root_list toss not empty"); spin_unlock(&ls->ls_rsbtbl[i].lock); } out: @@ -824,28 +840,26 @@ void dlm_release_root_list(struct dlm_ls *ls) up_write(&ls->ls_root_sem); } -/* If not using a directory, clear the entire toss list, there's no benefit to - caching the master value since it's fixed. If we are using a dir, keep the - rsb's we're the master of. Recovery will add them to the root list and from - there they'll be entered in the rebuilt directory. */ - -void dlm_clear_toss_list(struct dlm_ls *ls) +void dlm_clear_toss(struct dlm_ls *ls) { struct rb_node *n, *next; - struct dlm_rsb *rsb; + struct dlm_rsb *r; + unsigned int count = 0; int i; for (i = 0; i < ls->ls_rsbtbl_size; i++) { spin_lock(&ls->ls_rsbtbl[i].lock); for (n = rb_first(&ls->ls_rsbtbl[i].toss); n; n = next) { - next = rb_next(n);; - rsb = rb_entry(n, struct dlm_rsb, res_hashnode); - if (dlm_no_directory(ls) || !is_master(rsb)) { - rb_erase(n, &ls->ls_rsbtbl[i].toss); - dlm_free_rsb(rsb); - } + next = rb_next(n); + r = rb_entry(n, struct dlm_rsb, res_hashnode); + rb_erase(n, &ls->ls_rsbtbl[i].toss); + dlm_free_rsb(r); + count++; } spin_unlock(&ls->ls_rsbtbl[i].lock); } + + if (count) + log_debug(ls, "dlm_clear_toss %u done", count); } diff --git a/fs/dlm/recover.h b/fs/dlm/recover.h index ebd0363..d8c8738 100644 --- a/fs/dlm/recover.h +++ b/fs/dlm/recover.h @@ -27,7 +27,7 @@ int dlm_recover_locks(struct dlm_ls *ls); void dlm_recovered_lock(struct dlm_rsb *r); int dlm_create_root_list(struct dlm_ls *ls); void dlm_release_root_list(struct dlm_ls *ls); -void dlm_clear_toss_list(struct dlm_ls *ls); +void dlm_clear_toss(struct dlm_ls *ls); void dlm_recover_rsbs(struct dlm_ls *ls); #endif /* __RECOVER_DOT_H__ */ diff --git a/fs/dlm/recoverd.c b/fs/dlm/recoverd.c index f1a9073..88ce65f 100644 --- a/fs/dlm/recoverd.c +++ b/fs/dlm/recoverd.c @@ -60,12 +60,7 @@ static int ls_recover(struct dlm_ls *ls, struct dlm_recover *rv) dlm_callback_suspend(ls); - /* - * Free non-master tossed rsb's. Master rsb's are kept on toss - * list and put on root list to be included in resdir recovery. - */ - - dlm_clear_toss_list(ls); + dlm_clear_toss(ls); /* * This list of root rsb's will be the basis of most of the recovery @@ -84,6 +79,10 @@ static int ls_recover(struct dlm_ls *ls, struct dlm_recover *rv) goto fail; } + dlm_recover_dir_nodeid(ls); + + ls->ls_recover_dir_sent_res = 0; + ls->ls_recover_dir_sent_msg = 0; ls->ls_recover_locks_in = 0; dlm_set_recover_status(ls, DLM_RS_NODES); @@ -115,6 +114,9 @@ static int ls_recover(struct dlm_ls *ls, struct dlm_recover *rv) goto fail; } + log_debug(ls, "dlm_recover_directory %u out %u messages", + ls->ls_recover_dir_sent_res, ls->ls_recover_dir_sent_msg); + /* * We may have outstanding operations that are waiting for a reply from * a failed node. Mark these to be resent after recovery. Unlock and |
