diff options
| -rw-r--r-- | fs/lockd/svclock.c | 119 | ||||
| -rw-r--r-- | fs/lockd/svcsubs.c | 5 | ||||
| -rw-r--r-- | include/linux/lockd/lockd.h | 7 |
3 files changed, 62 insertions, 69 deletions
diff --git a/fs/lockd/svclock.c b/fs/lockd/svclock.c index 3127ae9e435..7209712f383 100644 --- a/fs/lockd/svclock.c +++ b/fs/lockd/svclock.c @@ -40,7 +40,7 @@ static void nlmsvc_release_block(struct nlm_block *block); static void nlmsvc_insert_block(struct nlm_block *block, unsigned long); -static int nlmsvc_remove_block(struct nlm_block *block); +static void nlmsvc_remove_block(struct nlm_block *block); static int nlmsvc_setgrantargs(struct nlm_rqst *call, struct nlm_lock *lock); static void nlmsvc_freegrantargs(struct nlm_rqst *call); @@ -49,7 +49,7 @@ static const struct rpc_call_ops nlmsvc_grant_ops; /* * The list of blocked locks to retry */ -static struct nlm_block * nlm_blocked; +static LIST_HEAD(nlm_blocked); /* * Insert a blocked lock into the global list @@ -57,48 +57,44 @@ static struct nlm_block * nlm_blocked; static void nlmsvc_insert_block(struct nlm_block *block, unsigned long when) { - struct nlm_block **bp, *b; + struct nlm_block *b; + struct list_head *pos; dprintk("lockd: nlmsvc_insert_block(%p, %ld)\n", block, when); - kref_get(&block->b_count); - if (block->b_queued) - nlmsvc_remove_block(block); - bp = &nlm_blocked; + if (list_empty(&block->b_list)) { + kref_get(&block->b_count); + } else { + list_del_init(&block->b_list); + } + + pos = &nlm_blocked; if (when != NLM_NEVER) { if ((when += jiffies) == NLM_NEVER) when ++; - while ((b = *bp) && time_before_eq(b->b_when,when) && b->b_when != NLM_NEVER) - bp = &b->b_next; - } else - while ((b = *bp) != 0) - bp = &b->b_next; + list_for_each(pos, &nlm_blocked) { + b = list_entry(pos, struct nlm_block, b_list); + if (time_after(b->b_when,when) || b->b_when == NLM_NEVER) + break; + } + /* On normal exit from the loop, pos == &nlm_blocked, + * so we will be adding to the end of the list - good + */ + } - block->b_queued = 1; + list_add_tail(&block->b_list, pos); block->b_when = when; - block->b_next = b; - *bp = block; } /* * Remove a block from the global list */ -static int +static inline void nlmsvc_remove_block(struct nlm_block *block) { - struct nlm_block **bp, *b; - - if (!block->b_queued) - return 1; - for (bp = &nlm_blocked; (b = *bp) != 0; bp = &b->b_next) { - if (b == block) { - *bp = block->b_next; - block->b_queued = 0; - nlmsvc_release_block(block); - return 1; - } + if (!list_empty(&block->b_list)) { + list_del_init(&block->b_list); + nlmsvc_release_block(block); } - - return 0; } /* @@ -107,14 +103,14 @@ nlmsvc_remove_block(struct nlm_block *block) static struct nlm_block * nlmsvc_lookup_block(struct nlm_file *file, struct nlm_lock *lock) { - struct nlm_block **head, *block; + struct nlm_block *block; struct file_lock *fl; dprintk("lockd: nlmsvc_lookup_block f=%p pd=%d %Ld-%Ld ty=%d\n", file, lock->fl.fl_pid, (long long)lock->fl.fl_start, (long long)lock->fl.fl_end, lock->fl.fl_type); - for (head = &nlm_blocked; (block = *head) != 0; head = &block->b_next) { + list_for_each_entry(block, &nlm_blocked, b_list) { fl = &block->b_call->a_args.lock.fl; dprintk("lockd: check f=%p pd=%d %Ld-%Ld ty=%d cookie=%s\n", block->b_file, fl->fl_pid, @@ -147,16 +143,16 @@ nlmsvc_find_block(struct nlm_cookie *cookie, struct sockaddr_in *sin) { struct nlm_block *block; - for (block = nlm_blocked; block; block = block->b_next) { - dprintk("cookie: head of blocked queue %p, block %p\n", - nlm_blocked, block); + list_for_each_entry(block, &nlm_blocked, b_list) { if (nlm_cookie_match(&block->b_call->a_args.cookie,cookie) && nlm_cmp_addr(sin, &block->b_host->h_addr)) - break; + goto found; } - if (block != NULL) - kref_get(&block->b_count); + return NULL; + +found: + kref_get(&block->b_count); return block; } @@ -192,6 +188,8 @@ nlmsvc_create_block(struct svc_rqst *rqstp, struct nlm_file *file, if (block == NULL) goto failed; kref_init(&block->b_count); + INIT_LIST_HEAD(&block->b_list); + INIT_LIST_HEAD(&block->b_flist); if (!nlmsvc_setgrantargs(call, lock)) goto failed_free; @@ -210,8 +208,7 @@ nlmsvc_create_block(struct svc_rqst *rqstp, struct nlm_file *file, file->f_count++; /* Add to file's list of blocks */ - block->b_fnext = file->f_blocks; - file->f_blocks = block; + list_add(&block->b_flist, &file->f_blocks); /* Set up RPC arguments for callback */ block->b_call = call; @@ -248,18 +245,12 @@ static void nlmsvc_free_block(struct kref *kref) { struct nlm_block *block = container_of(kref, struct nlm_block, b_count); struct nlm_file *file = block->b_file; - struct nlm_block **bp; dprintk("lockd: freeing block %p...\n", block); - down(&file->f_sema); /* Remove block from file's list of blocks */ - for (bp = &file->f_blocks; *bp; bp = &(*bp)->b_fnext) { - if (*bp == block) { - *bp = block->b_fnext; - break; - } - } + down(&file->f_sema); + list_del_init(&block->b_flist); up(&file->f_sema); nlmsvc_freegrantargs(block->b_call); @@ -279,21 +270,23 @@ static void nlmsvc_act_mark(struct nlm_host *host, struct nlm_file *file) struct nlm_block *block; down(&file->f_sema); - for (block = file->f_blocks; block != NULL; block = block->b_fnext) + list_for_each_entry(block, &file->f_blocks, b_flist) block->b_host->h_inuse = 1; up(&file->f_sema); } static void nlmsvc_act_unlock(struct nlm_host *host, struct nlm_file *file) { - struct nlm_block *block; + struct nlm_block *block, *next; restart: down(&file->f_sema); - for (block = file->f_blocks; block != NULL; block = block->b_fnext) { + list_for_each_entry_safe(block, next, &file->f_blocks, b_flist) { if (host != NULL && host != block->b_host) continue; - if (!block->b_queued) + /* Do not destroy blocks that are not on + * the global retry list - why? */ + if (list_empty(&block->b_list)) continue; kref_get(&block->b_count); up(&file->f_sema); @@ -528,10 +521,10 @@ nlmsvc_cancel_blocked(struct nlm_file *file, struct nlm_lock *lock) static void nlmsvc_notify_blocked(struct file_lock *fl) { - struct nlm_block **bp, *block; + struct nlm_block *block; dprintk("lockd: VFS unblock notification for block %p\n", fl); - for (bp = &nlm_blocked; (block = *bp) != 0; bp = &block->b_next) { + list_for_each_entry(block, &nlm_blocked, b_list) { if (nlm_compare_locks(&block->b_call->a_args.lock.fl, fl)) { nlmsvc_insert_block(block, 0); svc_wake_up(block->b_daemon); @@ -697,16 +690,19 @@ nlmsvc_grant_reply(struct svc_rqst *rqstp, struct nlm_cookie *cookie, u32 status unsigned long nlmsvc_retry_blocked(void) { - struct nlm_block *block; + unsigned long timeout = MAX_SCHEDULE_TIMEOUT; + struct nlm_block *block; + + while (!list_empty(&nlm_blocked)) { + block = list_entry(nlm_blocked.next, struct nlm_block, b_list); - dprintk("nlmsvc_retry_blocked(%p, when=%ld)\n", - nlm_blocked, - nlm_blocked? nlm_blocked->b_when : 0); - while ((block = nlm_blocked) != 0) { if (block->b_when == NLM_NEVER) break; - if (time_after(block->b_when,jiffies)) + if (time_after(block->b_when,jiffies)) { + timeout = block->b_when - jiffies; break; + } + dprintk("nlmsvc_retry_blocked(%p, when=%ld)\n", block, block->b_when); kref_get(&block->b_count); @@ -714,8 +710,5 @@ nlmsvc_retry_blocked(void) nlmsvc_release_block(block); } - if ((block = nlm_blocked) && block->b_when != NLM_NEVER) - return (block->b_when - jiffies); - - return MAX_SCHEDULE_TIMEOUT; + return timeout; } diff --git a/fs/lockd/svcsubs.c b/fs/lockd/svcsubs.c index c8308bccd31..a92fc581314 100644 --- a/fs/lockd/svcsubs.c +++ b/fs/lockd/svcsubs.c @@ -107,6 +107,7 @@ nlm_lookup_file(struct svc_rqst *rqstp, struct nlm_file **result, memcpy(&file->f_handle, f, sizeof(struct nfs_fh)); file->f_hash = hash; init_MUTEX(&file->f_sema); + INIT_LIST_HEAD(&file->f_blocks); /* Open the file. Note that this must not sleep for too long, else * we would lock up lockd:-) So no NFS re-exports, folks. @@ -220,7 +221,7 @@ nlm_inspect_file(struct nlm_host *host, struct nlm_file *file, int action) { if (action == NLM_ACT_CHECK) { /* Fast path for mark and sweep garbage collection */ - if (file->f_count || file->f_blocks || file->f_shares) + if (file->f_count || list_empty(&file->f_blocks) || file->f_shares) return 1; } else { nlmsvc_traverse_blocks(host, file, action); @@ -253,7 +254,7 @@ nlm_traverse_files(struct nlm_host *host, int action) mutex_lock(&nlm_file_mutex); file->f_count--; /* No more references to this file. Let go of it. */ - if (!file->f_blocks && !file->f_locks + if (list_empty(&file->f_blocks) && !file->f_locks && !file->f_shares && !file->f_count) { *fp = file->f_next; nlmsvc_ops->fclose(file->f_file); diff --git a/include/linux/lockd/lockd.h b/include/linux/lockd/lockd.h index c8635d84d5d..2e740f6a2f7 100644 --- a/include/linux/lockd/lockd.h +++ b/include/linux/lockd/lockd.h @@ -109,7 +109,7 @@ struct nlm_file { struct nfs_fh f_handle; /* NFS file handle */ struct file * f_file; /* VFS file pointer */ struct nlm_share * f_shares; /* DOS shares */ - struct nlm_block * f_blocks; /* blocked locks */ + struct list_head f_blocks; /* blocked locks */ unsigned int f_locks; /* guesstimate # of locks */ unsigned int f_count; /* reference count */ struct semaphore f_sema; /* avoid concurrent access */ @@ -123,14 +123,13 @@ struct nlm_file { #define NLM_NEVER (~(unsigned long) 0) struct nlm_block { struct kref b_count; /* Reference count */ - struct nlm_block * b_next; /* linked list (all blocks) */ - struct nlm_block * b_fnext; /* linked list (per file) */ + struct list_head b_list; /* linked list of all blocks */ + struct list_head b_flist; /* linked list (per file) */ struct nlm_rqst * b_call; /* RPC args & callback info */ struct svc_serv * b_daemon; /* NLM service */ struct nlm_host * b_host; /* host handle for RPC clnt */ unsigned long b_when; /* next re-xmit */ unsigned int b_id; /* block id */ - unsigned char b_queued; /* re-queued */ unsigned char b_granted; /* VFS granted lock */ struct nlm_file * b_file; /* file in question */ }; |