From: "J. Bruce Fields" Subject: [PATCH 3/10] lockd: request deferral routine Date: Wed, 6 Dec 2006 00:34:13 -0500 Message-ID: <11653832601058-git-send-email-bfields@fieldses.org> References: <11653832602203-git-send-email-bfields@fieldses.org> <1165383260627-git-send-email-bfields@fieldses.org> <11653832603105-git-send-email-bfields@fieldses.org> Cc: nfs@lists.sourceforge.net, Marc Eshel Return-path: To: linux-fsdevel@vger.kernel.org In-Reply-To: <11653832603105-git-send-email-bfields@fieldses.org> Message-Id: <610c7d52f6363606200fa1016804e7116d580c36.1165380893.git.bfields@citi.umich.edu> In-Reply-To: <8eb625184e6025f7f3d081dfe0a805abdd62a068.1165380892.git.bfields@citi.umich.edu> References: <8eb625184e6025f7f3d081dfe0a805abdd62a068.1165380892.git.bfields@citi.umich.edu> To: me Sender: linux-fsdevel-owner@vger.kernel.org List-ID: From: Marc Eshel We need to keep some state for a pending asynchronous lock request, so this patch adds that state to struct nlm_block. This also adds a function which defers the request, by calling rqstp->rq_chandle.defer and storing the resulting deferred request in a nlm_block structure which we insert into lockd's global block list. That new function isn't called yet, so it's dead code until a later patch. Signed-off-by: Marc Eshel Signed-off-by: J. Bruce Fields --- fs/lockd/svclock.c | 25 +++++++++++++++++++++++++ include/linux/lockd/lockd.h | 10 ++++++++++ 2 files changed, 35 insertions(+), 0 deletions(-) diff --git a/fs/lockd/svclock.c b/fs/lockd/svclock.c index f523ca2..2ce4dc6 100644 --- a/fs/lockd/svclock.c +++ b/fs/lockd/svclock.c @@ -437,6 +437,31 @@ static void nlmsvc_freegrantargs(struct nlm_rqst *call) } /* + * Deferred lock request handling for non-blocking lock + */ +static u32 +nlmsvc_defer_lock_rqst(struct svc_rqst *rqstp, struct nlm_block *block) +{ + u32 status = nlm_lck_denied_nolocks; + + block->b_flags |= B_QUEUED; + + nlmsvc_insert_block(block, NLM_TIMEOUT); + + block->b_cache_req = &rqstp->rq_chandle; + if (rqstp->rq_chandle.defer) { + block->b_deferred_req = + rqstp->rq_chandle.defer(block->b_cache_req); + if (block->b_deferred_req != NULL) + status = nlm_drop_reply; + } + dprintk("lockd: nlmsvc_defer_lock_rqst block %p flags %d status %d\n", + block, block->b_flags, status); + + return status; +} + +/* * Attempt to establish a lock, and if it can't be granted, block it * if required. */ diff --git a/include/linux/lockd/lockd.h b/include/linux/lockd/lockd.h index 862d973..ac865f8 100644 --- a/include/linux/lockd/lockd.h +++ b/include/linux/lockd/lockd.h @@ -119,6 +119,9 @@ struct nlm_file { * couldn't be granted because of a conflicting lock). */ #define NLM_NEVER (~(unsigned long) 0) +/* timeout on non-blocking call: */ +#define NLM_TIMEOUT (7 * HZ) + struct nlm_block { struct kref b_count; /* Reference count */ struct list_head b_list; /* linked list of all blocks */ @@ -130,6 +133,13 @@ struct nlm_block { unsigned int b_id; /* block id */ unsigned char b_granted; /* VFS granted lock */ struct nlm_file * b_file; /* file in question */ + struct cache_req * b_cache_req; /* deferred request handling */ + struct file_lock * b_fl; /* set for GETLK */ + struct cache_deferred_req * b_deferred_req; + unsigned int b_flags; /* block flags */ +#define B_QUEUED 1 /* lock queued */ +#define B_GOT_CALLBACK 2 /* got lock or conflicting lock */ +#define B_TOO_LATE 4 /* too late for non-blocking lock */ }; /* -- 1.4.4.1