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https://github.com/edk2-porting/linux-next.git
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[PATCH] knfsd: lockd: Change list of blocked list to list_node
This patch changes the nlm_blocked list to use a list_node instead of homegrown linked list handling. Signed-off-by: Olaf Kirch <okir@suse.de> Signed-off-by: Neil Brown <neilb@suse.de> Signed-off-by: Andrew Morton <akpm@osdl.org> Signed-off-by: Linus Torvalds <torvalds@osdl.org>
This commit is contained in:
Olaf Kirch
Linus Torvalds
parent
0cea32761a
commit
68a2d76cea
@ -40,7 +40,7 @@
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static void nlmsvc_release_block(struct nlm_block *block);
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static void nlmsvc_insert_block(struct nlm_block *block, unsigned long);
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static int nlmsvc_remove_block(struct nlm_block *block);
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static void nlmsvc_remove_block(struct nlm_block *block);
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static int nlmsvc_setgrantargs(struct nlm_rqst *call, struct nlm_lock *lock);
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static void nlmsvc_freegrantargs(struct nlm_rqst *call);
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@ -49,7 +49,7 @@ static const struct rpc_call_ops nlmsvc_grant_ops;
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/*
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* The list of blocked locks to retry
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*/
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static struct nlm_block * nlm_blocked;
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static LIST_HEAD(nlm_blocked);
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/*
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* Insert a blocked lock into the global list
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@ -57,64 +57,60 @@ static struct nlm_block * nlm_blocked;
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static void
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nlmsvc_insert_block(struct nlm_block *block, unsigned long when)
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{
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struct nlm_block **bp, *b;
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struct nlm_block *b;
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struct list_head *pos;
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dprintk("lockd: nlmsvc_insert_block(%p, %ld)\n", block, when);
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if (list_empty(&block->b_list)) {
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kref_get(&block->b_count);
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if (block->b_queued)
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nlmsvc_remove_block(block);
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bp = &nlm_blocked;
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} else {
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list_del_init(&block->b_list);
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}
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pos = &nlm_blocked;
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if (when != NLM_NEVER) {
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if ((when += jiffies) == NLM_NEVER)
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when ++;
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while ((b = *bp) && time_before_eq(b->b_when,when) && b->b_when != NLM_NEVER)
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bp = &b->b_next;
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} else
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while ((b = *bp) != 0)
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bp = &b->b_next;
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list_for_each(pos, &nlm_blocked) {
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b = list_entry(pos, struct nlm_block, b_list);
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if (time_after(b->b_when,when) || b->b_when == NLM_NEVER)
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break;
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}
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/* On normal exit from the loop, pos == &nlm_blocked,
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* so we will be adding to the end of the list - good
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*/
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}
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block->b_queued = 1;
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list_add_tail(&block->b_list, pos);
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block->b_when = when;
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block->b_next = b;
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*bp = block;
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}
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/*
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* Remove a block from the global list
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*/
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static int
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static inline void
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nlmsvc_remove_block(struct nlm_block *block)
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{
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struct nlm_block **bp, *b;
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if (!block->b_queued)
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return 1;
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for (bp = &nlm_blocked; (b = *bp) != 0; bp = &b->b_next) {
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if (b == block) {
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*bp = block->b_next;
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block->b_queued = 0;
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if (!list_empty(&block->b_list)) {
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list_del_init(&block->b_list);
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nlmsvc_release_block(block);
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return 1;
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}
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}
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return 0;
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}
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/*
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* Find a block for a given lock
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*/
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static struct nlm_block *
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nlmsvc_lookup_block(struct nlm_file *file, struct nlm_lock *lock)
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{
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struct nlm_block **head, *block;
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struct nlm_block *block;
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struct file_lock *fl;
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dprintk("lockd: nlmsvc_lookup_block f=%p pd=%d %Ld-%Ld ty=%d\n",
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file, lock->fl.fl_pid,
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(long long)lock->fl.fl_start,
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(long long)lock->fl.fl_end, lock->fl.fl_type);
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for (head = &nlm_blocked; (block = *head) != 0; head = &block->b_next) {
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list_for_each_entry(block, &nlm_blocked, b_list) {
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fl = &block->b_call->a_args.lock.fl;
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dprintk("lockd: check f=%p pd=%d %Ld-%Ld ty=%d cookie=%s\n",
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block->b_file, fl->fl_pid,
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@ -147,15 +143,15 @@ nlmsvc_find_block(struct nlm_cookie *cookie, struct sockaddr_in *sin)
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{
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struct nlm_block *block;
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for (block = nlm_blocked; block; block = block->b_next) {
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dprintk("cookie: head of blocked queue %p, block %p\n",
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nlm_blocked, block);
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list_for_each_entry(block, &nlm_blocked, b_list) {
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if (nlm_cookie_match(&block->b_call->a_args.cookie,cookie)
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&& nlm_cmp_addr(sin, &block->b_host->h_addr))
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break;
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goto found;
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}
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if (block != NULL)
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return NULL;
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found:
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kref_get(&block->b_count);
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return block;
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}
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@ -192,6 +188,8 @@ nlmsvc_create_block(struct svc_rqst *rqstp, struct nlm_file *file,
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if (block == NULL)
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goto failed;
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kref_init(&block->b_count);
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INIT_LIST_HEAD(&block->b_list);
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INIT_LIST_HEAD(&block->b_flist);
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if (!nlmsvc_setgrantargs(call, lock))
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goto failed_free;
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@ -210,8 +208,7 @@ nlmsvc_create_block(struct svc_rqst *rqstp, struct nlm_file *file,
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file->f_count++;
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/* Add to file's list of blocks */
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block->b_fnext = file->f_blocks;
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file->f_blocks = block;
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list_add(&block->b_flist, &file->f_blocks);
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/* Set up RPC arguments for callback */
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block->b_call = call;
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@ -248,18 +245,12 @@ static void nlmsvc_free_block(struct kref *kref)
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{
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struct nlm_block *block = container_of(kref, struct nlm_block, b_count);
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struct nlm_file *file = block->b_file;
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struct nlm_block **bp;
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dprintk("lockd: freeing block %p...\n", block);
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down(&file->f_sema);
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/* Remove block from file's list of blocks */
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for (bp = &file->f_blocks; *bp; bp = &(*bp)->b_fnext) {
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if (*bp == block) {
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*bp = block->b_fnext;
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break;
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}
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}
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down(&file->f_sema);
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list_del_init(&block->b_flist);
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up(&file->f_sema);
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nlmsvc_freegrantargs(block->b_call);
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@ -279,21 +270,23 @@ static void nlmsvc_act_mark(struct nlm_host *host, struct nlm_file *file)
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struct nlm_block *block;
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down(&file->f_sema);
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for (block = file->f_blocks; block != NULL; block = block->b_fnext)
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list_for_each_entry(block, &file->f_blocks, b_flist)
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block->b_host->h_inuse = 1;
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up(&file->f_sema);
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}
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static void nlmsvc_act_unlock(struct nlm_host *host, struct nlm_file *file)
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{
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struct nlm_block *block;
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struct nlm_block *block, *next;
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restart:
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down(&file->f_sema);
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for (block = file->f_blocks; block != NULL; block = block->b_fnext) {
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list_for_each_entry_safe(block, next, &file->f_blocks, b_flist) {
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if (host != NULL && host != block->b_host)
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continue;
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if (!block->b_queued)
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/* Do not destroy blocks that are not on
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* the global retry list - why? */
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if (list_empty(&block->b_list))
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continue;
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kref_get(&block->b_count);
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up(&file->f_sema);
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@ -528,10 +521,10 @@ nlmsvc_cancel_blocked(struct nlm_file *file, struct nlm_lock *lock)
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static void
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nlmsvc_notify_blocked(struct file_lock *fl)
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{
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struct nlm_block **bp, *block;
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struct nlm_block *block;
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dprintk("lockd: VFS unblock notification for block %p\n", fl);
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for (bp = &nlm_blocked; (block = *bp) != 0; bp = &block->b_next) {
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list_for_each_entry(block, &nlm_blocked, b_list) {
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if (nlm_compare_locks(&block->b_call->a_args.lock.fl, fl)) {
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nlmsvc_insert_block(block, 0);
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svc_wake_up(block->b_daemon);
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@ -697,16 +690,19 @@ nlmsvc_grant_reply(struct svc_rqst *rqstp, struct nlm_cookie *cookie, u32 status
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unsigned long
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nlmsvc_retry_blocked(void)
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{
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unsigned long timeout = MAX_SCHEDULE_TIMEOUT;
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struct nlm_block *block;
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dprintk("nlmsvc_retry_blocked(%p, when=%ld)\n",
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nlm_blocked,
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nlm_blocked? nlm_blocked->b_when : 0);
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while ((block = nlm_blocked) != 0) {
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while (!list_empty(&nlm_blocked)) {
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block = list_entry(nlm_blocked.next, struct nlm_block, b_list);
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if (block->b_when == NLM_NEVER)
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break;
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if (time_after(block->b_when,jiffies))
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if (time_after(block->b_when,jiffies)) {
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timeout = block->b_when - jiffies;
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break;
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}
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dprintk("nlmsvc_retry_blocked(%p, when=%ld)\n",
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block, block->b_when);
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kref_get(&block->b_count);
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@ -714,8 +710,5 @@ nlmsvc_retry_blocked(void)
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nlmsvc_release_block(block);
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}
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if ((block = nlm_blocked) && block->b_when != NLM_NEVER)
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return (block->b_when - jiffies);
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return MAX_SCHEDULE_TIMEOUT;
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return timeout;
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}
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@ -107,6 +107,7 @@ nlm_lookup_file(struct svc_rqst *rqstp, struct nlm_file **result,
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memcpy(&file->f_handle, f, sizeof(struct nfs_fh));
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file->f_hash = hash;
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init_MUTEX(&file->f_sema);
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INIT_LIST_HEAD(&file->f_blocks);
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/* Open the file. Note that this must not sleep for too long, else
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* we would lock up lockd:-) So no NFS re-exports, folks.
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@ -220,7 +221,7 @@ nlm_inspect_file(struct nlm_host *host, struct nlm_file *file, int action)
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{
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if (action == NLM_ACT_CHECK) {
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/* Fast path for mark and sweep garbage collection */
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if (file->f_count || file->f_blocks || file->f_shares)
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if (file->f_count || list_empty(&file->f_blocks) || file->f_shares)
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return 1;
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} else {
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nlmsvc_traverse_blocks(host, file, action);
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@ -253,7 +254,7 @@ nlm_traverse_files(struct nlm_host *host, int action)
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mutex_lock(&nlm_file_mutex);
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file->f_count--;
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/* No more references to this file. Let go of it. */
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if (!file->f_blocks && !file->f_locks
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if (list_empty(&file->f_blocks) && !file->f_locks
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&& !file->f_shares && !file->f_count) {
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*fp = file->f_next;
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nlmsvc_ops->fclose(file->f_file);
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@ -109,7 +109,7 @@ struct nlm_file {
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struct nfs_fh f_handle; /* NFS file handle */
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struct file * f_file; /* VFS file pointer */
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struct nlm_share * f_shares; /* DOS shares */
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struct nlm_block * f_blocks; /* blocked locks */
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struct list_head f_blocks; /* blocked locks */
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unsigned int f_locks; /* guesstimate # of locks */
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unsigned int f_count; /* reference count */
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struct semaphore f_sema; /* avoid concurrent access */
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@ -123,14 +123,13 @@ struct nlm_file {
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#define NLM_NEVER (~(unsigned long) 0)
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struct nlm_block {
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struct kref b_count; /* Reference count */
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struct nlm_block * b_next; /* linked list (all blocks) */
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struct nlm_block * b_fnext; /* linked list (per file) */
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struct list_head b_list; /* linked list of all blocks */
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struct list_head b_flist; /* linked list (per file) */
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struct nlm_rqst * b_call; /* RPC args & callback info */
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struct svc_serv * b_daemon; /* NLM service */
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struct nlm_host * b_host; /* host handle for RPC clnt */
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unsigned long b_when; /* next re-xmit */
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unsigned int b_id; /* block id */
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unsigned char b_queued; /* re-queued */
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unsigned char b_granted; /* VFS granted lock */
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struct nlm_file * b_file; /* file in question */
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};
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