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From: David Howells <dhowells@redhat.com> To: Trond.Myklebust@netapp.com, chuck.lever@oracle.com Cc: nfsv4@linux-nfs.org, linux-kernel@vger.kernel.org, linux-fsdevel@vger.kernel.org, selinux@tycho.nsa.gov, linux-security-module@vger.kernel.org, dhowells@redhat.com Subject: [PATCH 13/37] FS-Cache: Provide an add_wait_queue_tail() function Date: Fri, 08 Feb 2008 16:53:07 +0000 [thread overview] Message-ID: <20080208165307.15902.97007.stgit@warthog.procyon.org.uk> (raw) In-Reply-To: <20080208165156.15902.62457.stgit@warthog.procyon.org.uk> Provide an add_wait_queue_tail() function to add a waiter to the back of a wait queue instead of the front. Signed-off-by: David Howells <dhowells@redhat.com> --- include/linux/pagemap.h | 7 +++++-- include/linux/wait.h | 2 ++ kernel/wait.c | 18 ++++++++++++++++++ mm/filemap.c | 2 +- 4 files changed, 26 insertions(+), 3 deletions(-) diff --git a/include/linux/pagemap.h b/include/linux/pagemap.h index 51c39f8..cecbace 100644 --- a/include/linux/pagemap.h +++ b/include/linux/pagemap.h @@ -225,8 +225,11 @@ static inline void wait_on_page_writeback(struct page *page) extern void end_page_writeback(struct page *page); -/* - * Wait for a PG_owner_priv_2 to become clear +/** + * wait_on_page_owner_priv_2 - Wait for PG_owner_priv_2 to become clear + * @page: The page to monitor + * + * Wait for a PG_owner_priv_2 to become clear on the specified page. */ static inline void wait_on_page_owner_priv_2(struct page *page) { diff --git a/include/linux/wait.h b/include/linux/wait.h index 33a2aa9..5032ebb 100644 --- a/include/linux/wait.h +++ b/include/linux/wait.h @@ -118,6 +118,8 @@ static inline int waitqueue_active(wait_queue_head_t *q) #define is_sync_wait(wait) (!(wait) || ((wait)->private)) extern void FASTCALL(add_wait_queue(wait_queue_head_t *q, wait_queue_t * wait)); +extern void FASTCALL(add_wait_queue_tail(wait_queue_head_t *q, + wait_queue_t *wait)); extern void FASTCALL(add_wait_queue_exclusive(wait_queue_head_t *q, wait_queue_t * wait)); extern void FASTCALL(remove_wait_queue(wait_queue_head_t *q, wait_queue_t * wait)); diff --git a/kernel/wait.c b/kernel/wait.c index f987688..a82b012 100644 --- a/kernel/wait.c +++ b/kernel/wait.c @@ -29,6 +29,24 @@ void fastcall add_wait_queue(wait_queue_head_t *q, wait_queue_t *wait) } EXPORT_SYMBOL(add_wait_queue); +/** + * add_wait_queue_tail - Add a waiter to the back of a waitqueue + * @q: the wait queue to append the waiter to + * @wait: the waiter to be queued + * + * Add a waiter to the back of a waitqueue so that it gets woken up last. + */ +void fastcall add_wait_queue_tail(wait_queue_head_t *q, wait_queue_t *wait) +{ + unsigned long flags; + + wait->flags &= ~WQ_FLAG_EXCLUSIVE; + spin_lock_irqsave(&q->lock, flags); + __add_wait_queue_tail(q, wait); + spin_unlock_irqrestore(&q->lock, flags); +} +EXPORT_SYMBOL(add_wait_queue_tail); + void fastcall add_wait_queue_exclusive(wait_queue_head_t *q, wait_queue_t *wait) { unsigned long flags; diff --git a/mm/filemap.c b/mm/filemap.c index 138e791..8d64000 100644 --- a/mm/filemap.c +++ b/mm/filemap.c @@ -587,7 +587,7 @@ void end_page_writeback(struct page *page) EXPORT_SYMBOL(end_page_writeback); /** - * end_page_own - Clear PG_owner_priv_2 and wake up any waiters + * end_page_owner_priv_2 - Clear PG_owner_priv_2 and wake up any waiters * @page: the page * * Clear PG_owner_priv_2 and wake up any processes waiting for that event.
next prev parent reply other threads:[~2008-02-08 17:02 UTC|newest] Thread overview: 45+ messages / expand[flat|nested] mbox.gz Atom feed top 2008-02-08 16:51 [PATCH 00/37] Permit filesystem local caching David Howells 2008-02-08 16:52 ` [PATCH 01/37] KEYS: Increase the payload size when instantiating a key David Howells 2008-02-08 16:52 ` [PATCH 02/37] KEYS: Check starting keyring as part of search David Howells 2008-02-08 16:52 ` [PATCH 03/37] KEYS: Allow the callout data to be passed as a blob rather than a string David Howells 2008-02-08 16:52 ` [PATCH 04/37] KEYS: Add keyctl function to get a security label David Howells 2008-02-08 16:52 ` [PATCH 05/37] Security: Change current->fs[ug]id to current_fs[ug]id() David Howells 2008-02-11 10:38 ` James Morris 2008-02-08 16:52 ` [PATCH 06/37] Security: Separate task security context from task_struct David Howells 2008-02-11 10:43 ` James Morris 2008-02-08 16:52 ` [PATCH 07/37] Security: De-embed task security record from task and use refcounting David Howells 2008-02-11 10:57 ` James Morris 2008-02-11 17:30 ` David Howells 2008-02-11 18:48 ` Stephen Smalley 2008-02-08 16:52 ` [PATCH 08/37] Security: Add a kernel_service object class to SELinux David Howells 2008-02-11 10:59 ` James Morris 2008-02-08 16:52 ` [PATCH 09/37] Security: Allow kernel services to override LSM settings for task actions David Howells 2008-02-08 16:52 ` [PATCH 10/37] Security: Make NFSD work with detached security David Howells 2008-02-08 16:52 ` [PATCH 11/37] FS-Cache: Release page->private after failed readahead David Howells 2008-02-08 16:53 ` [PATCH 12/37] FS-Cache: Recruit a couple of page flags for cache management David Howells 2008-02-08 16:53 ` David Howells [this message] 2008-02-08 16:53 ` [PATCH 14/37] FS-Cache: Generic filesystem caching facility David Howells 2008-02-08 16:53 ` [PATCH 15/37] CacheFiles: Add missing copy_page export for ia64 David Howells 2008-02-08 16:53 ` [PATCH 16/37] CacheFiles: Be consistent about the use of mapping vs file->f_mapping in Ext3 David Howells 2008-02-08 16:53 ` [PATCH 17/37] CacheFiles: Add a hook to write a single page of data to an inode David Howells 2008-02-08 16:53 ` [PATCH 18/37] CacheFiles: Permit the page lock state to be monitored David Howells 2008-02-08 16:53 ` [PATCH 19/37] CacheFiles: Export things for CacheFiles David Howells 2008-02-08 16:53 ` [PATCH 20/37] CacheFiles: A cache that backs onto a mounted filesystem David Howells 2008-02-08 16:53 ` [PATCH 21/37] NFS: Add comment banners to some NFS functions David Howells 2008-02-08 16:53 ` [PATCH 22/37] NFS: Add FS-Cache option bit and debug bit David Howells 2008-02-08 16:54 ` [PATCH 23/37] NFS: Permit local filesystem caching to be enabled for NFS David Howells 2008-02-08 16:54 ` [PATCH 24/37] NFS: Register NFS for caching and retrieve the top-level index David Howells 2008-02-08 16:54 ` [PATCH 25/37] NFS: Define and create server-level objects David Howells 2008-02-08 16:54 ` [PATCH 26/37] NFS: Define and create superblock-level objects David Howells 2008-02-08 16:54 ` [PATCH 27/37] NFS: Define and create inode-level cache objects David Howells 2008-02-08 16:54 ` [PATCH 28/37] NFS: Use local disk inode cache David Howells 2008-02-08 16:54 ` [PATCH 29/37] NFS: Invalidate FsCache page flags when cache removed David Howells 2008-02-08 16:54 ` [PATCH 30/37] NFS: Add some new I/O event counters for FS-Cache events David Howells 2008-02-08 16:54 ` [PATCH 31/37] NFS: FS-Cache page management David Howells 2008-02-08 16:54 ` [PATCH 32/37] NFS: Add read context retention for FS-Cache to call back with David Howells 2008-02-08 16:54 ` [PATCH 33/37] NFS: nfs_readpage_async() needs to be accessible as a fallback for local caching David Howells 2008-02-08 16:54 ` [PATCH 34/37] NFS: Read pages from FS-Cache into an NFS inode David Howells 2008-02-08 16:55 ` [PATCH 35/37] NFS: Store pages from an NFS inode into a local cache David Howells 2008-02-08 16:55 ` [PATCH 36/37] NFS: Display local caching state David Howells 2008-02-08 16:55 ` [PATCH 37/37] NFS: Add mount options to enable local caching on NFS David Howells 2008-02-20 16:05 [PATCH 00/37] Permit filesystem local caching David Howells 2008-02-20 16:07 ` [PATCH 13/37] FS-Cache: Provide an add_wait_queue_tail() function David Howells
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