diff options
Diffstat (limited to 'fs/lockd/svclock.c')
| -rw-r--r-- | fs/lockd/svclock.c | 72 |
1 files changed, 57 insertions, 15 deletions
diff --git a/fs/lockd/svclock.c b/fs/lockd/svclock.c index 84055d31bfc5..6e31695d046f 100644 --- a/fs/lockd/svclock.c +++ b/fs/lockd/svclock.c @@ -25,7 +25,6 @@ #include <linux/errno.h> #include <linux/kernel.h> #include <linux/sched.h> -#include <linux/smp_lock.h> #include <linux/sunrpc/clnt.h> #include <linux/sunrpc/svc.h> #include <linux/lockd/nlm.h> @@ -47,17 +46,19 @@ 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); static const struct rpc_call_ops nlmsvc_grant_ops; +static const char *nlmdbg_cookie2a(const struct nlm_cookie *cookie); /* * The list of blocked locks to retry */ static LIST_HEAD(nlm_blocked); +static DEFINE_SPINLOCK(nlm_blocked_lock); /* * Insert a blocked lock into the global list */ static void -nlmsvc_insert_block(struct nlm_block *block, unsigned long when) +nlmsvc_insert_block_locked(struct nlm_block *block, unsigned long when) { struct nlm_block *b; struct list_head *pos; @@ -87,6 +88,13 @@ nlmsvc_insert_block(struct nlm_block *block, unsigned long when) block->b_when = when; } +static void nlmsvc_insert_block(struct nlm_block *block, unsigned long when) +{ + spin_lock(&nlm_blocked_lock); + nlmsvc_insert_block_locked(block, when); + spin_unlock(&nlm_blocked_lock); +} + /* * Remove a block from the global list */ @@ -94,7 +102,9 @@ static inline void nlmsvc_remove_block(struct nlm_block *block) { if (!list_empty(&block->b_list)) { + spin_lock(&nlm_blocked_lock); list_del_init(&block->b_list); + spin_unlock(&nlm_blocked_lock); nlmsvc_release_block(block); } } @@ -224,7 +234,7 @@ nlmsvc_create_block(struct svc_rqst *rqstp, struct nlm_host *host, failed_free: kfree(block); failed: - nlm_release_call(call); + nlmsvc_release_call(call); return NULL; } @@ -257,7 +267,7 @@ static void nlmsvc_free_block(struct kref *kref) mutex_unlock(&file->f_mutex); nlmsvc_freegrantargs(block->b_call); - nlm_release_call(block->b_call); + nlmsvc_release_call(block->b_call); nlm_release_file(block->b_file); kfree(block->b_fl); kfree(block); @@ -651,7 +661,7 @@ static int nlmsvc_grant_deferred(struct file_lock *fl, struct file_lock *conf, struct nlm_block *block; int rc = -ENOENT; - lock_kernel(); + spin_lock(&nlm_blocked_lock); list_for_each_entry(block, &nlm_blocked, b_list) { if (nlm_compare_locks(&block->b_call->a_args.lock.fl, fl)) { dprintk("lockd: nlmsvc_notify_blocked block %p flags %d\n", @@ -665,13 +675,13 @@ static int nlmsvc_grant_deferred(struct file_lock *fl, struct file_lock *conf, } else if (result == 0) block->b_granted = 1; - nlmsvc_insert_block(block, 0); + nlmsvc_insert_block_locked(block, 0); svc_wake_up(block->b_daemon); rc = 0; break; } } - unlock_kernel(); + spin_unlock(&nlm_blocked_lock); if (rc == -ENOENT) printk(KERN_WARNING "lockd: grant for unknown block\n"); return rc; @@ -690,14 +700,16 @@ nlmsvc_notify_blocked(struct file_lock *fl) struct nlm_block *block; dprintk("lockd: VFS unblock notification for block %p\n", fl); + spin_lock(&nlm_blocked_lock); 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); + nlmsvc_insert_block_locked(block, 0); + spin_unlock(&nlm_blocked_lock); svc_wake_up(block->b_daemon); return; } } - + spin_unlock(&nlm_blocked_lock); printk(KERN_WARNING "lockd: notification for unknown block!\n"); } @@ -803,7 +815,7 @@ static void nlmsvc_grant_callback(struct rpc_task *task, void *data) dprintk("lockd: GRANT_MSG RPC callback\n"); - lock_kernel(); + spin_lock(&nlm_blocked_lock); /* if the block is not on a list at this point then it has * been invalidated. Don't try to requeue it. * @@ -825,19 +837,20 @@ static void nlmsvc_grant_callback(struct rpc_task *task, void *data) /* Call was successful, now wait for client callback */ timeout = 60 * HZ; } - nlmsvc_insert_block(block, timeout); + nlmsvc_insert_block_locked(block, timeout); svc_wake_up(block->b_daemon); out: - unlock_kernel(); + spin_unlock(&nlm_blocked_lock); } +/* + * FIXME: nlmsvc_release_block() grabs a mutex. This is not allowed for an + * .rpc_release rpc_call_op + */ static void nlmsvc_grant_release(void *data) { struct nlm_rqst *call = data; - - lock_kernel(); nlmsvc_release_block(call->a_block); - unlock_kernel(); } static const struct rpc_call_ops nlmsvc_grant_ops = { @@ -922,3 +935,32 @@ nlmsvc_retry_blocked(void) return timeout; } + +#ifdef RPC_DEBUG +static const char *nlmdbg_cookie2a(const struct nlm_cookie *cookie) +{ + /* + * We can get away with a static buffer because we're only + * called with BKL held. + */ + static char buf[2*NLM_MAXCOOKIELEN+1]; + unsigned int i, len = sizeof(buf); + char *p = buf; + + len--; /* allow for trailing \0 */ + if (len < 3) + return "???"; + for (i = 0 ; i < cookie->len ; i++) { + if (len < 2) { + strcpy(p-3, "..."); + break; + } + sprintf(p, "%02x", cookie->data[i]); + p += 2; + len -= 2; + } + *p = '\0'; + + return buf; +} +#endif |