Return-Path: Received: (majordomo@vger.kernel.org) by vger.kernel.org via listexpand id S1753848AbdLFAua (ORCPT ); Tue, 5 Dec 2017 19:50:30 -0500 Received: from bombadil.infradead.org ([65.50.211.133]:42565 "EHLO bombadil.infradead.org" rhost-flags-OK-OK-OK-OK) by vger.kernel.org with ESMTP id S1753371AbdLFAmP (ORCPT ); Tue, 5 Dec 2017 19:42:15 -0500 From: Matthew Wilcox Cc: Matthew Wilcox , Ross Zwisler , Jens Axboe , Rehas Sachdeva , linux-mm@kvack.org, linux-fsdevel@vger.kernel.org, linux-f2fs-devel@lists.sourceforge.net, linux-nilfs@vger.kernel.org, linux-btrfs@vger.kernel.org, linux-xfs@vger.kernel.org, linux-usb@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v4 57/73] dax: Convert dax_unlock_mapping_entry to XArray Date: Tue, 5 Dec 2017 16:41:43 -0800 Message-Id: <20171206004159.3755-58-willy@infradead.org> X-Mailer: git-send-email 2.9.5 In-Reply-To: <20171206004159.3755-1-willy@infradead.org> References: <20171206004159.3755-1-willy@infradead.org> To: unlisted-recipients:; (no To-header on input) Sender: linux-kernel-owner@vger.kernel.org List-ID: X-Mailing-List: linux-kernel@vger.kernel.org Content-Length: 3341 Lines: 104 From: Matthew Wilcox Replace slot_locked() with dax_locked() and inline unlock_slot() into its only caller. Signed-off-by: Matthew Wilcox --- fs/dax.c | 50 ++++++++++++++++---------------------------------- 1 file changed, 16 insertions(+), 34 deletions(-) diff --git a/fs/dax.c b/fs/dax.c index 86bacca51eed..03bfa599f75c 100644 --- a/fs/dax.c +++ b/fs/dax.c @@ -73,6 +73,11 @@ fs_initcall(init_dax_wait_table); #define DAX_ZERO_PAGE (1UL << 2) #define DAX_EMPTY (1UL << 3) +static bool dax_locked(void *entry) +{ + return xa_to_value(entry) & DAX_ENTRY_LOCK; +} + static unsigned long dax_radix_sector(void *entry) { return xa_to_value(entry) >> DAX_SHIFT; @@ -182,17 +187,6 @@ static void dax_wake_mapping_entry_waiter(struct address_space *mapping, __wake_up(wq, TASK_NORMAL, wake_all ? 0 : 1, &key); } -/* - * Check whether the given slot is locked. The function must be called with - * mapping xa_lock held - */ -static inline int slot_locked(struct address_space *mapping, void **slot) -{ - unsigned long entry = xa_to_value( - radix_tree_deref_slot_protected(slot, &mapping->pages.xa_lock)); - return entry & DAX_ENTRY_LOCK; -} - /* * Mark the given slot is locked. The function must be called with * mapping xa_lock held @@ -206,19 +200,6 @@ static inline void *lock_slot(struct address_space *mapping, void **slot) return entry; } -/* - * Mark the given slot is unlocked. The function must be called with - * mapping xa_lock held - */ -static inline void *unlock_slot(struct address_space *mapping, void **slot) -{ - unsigned long v = xa_to_value( - radix_tree_deref_slot_protected(slot, &mapping->pages.xa_lock)); - void *entry = xa_mk_value(v & ~DAX_ENTRY_LOCK); - radix_tree_replace_slot(&mapping->pages, slot, entry); - return entry; -} - /* * Lookup entry in radix tree, wait for it to become unlocked if it is * a data value entry and return it. The caller must call @@ -242,8 +223,7 @@ static void *get_unlocked_mapping_entry(struct address_space *mapping, entry = __radix_tree_lookup(&mapping->pages, index, NULL, &slot); if (!entry || - WARN_ON_ONCE(!xa_is_value(entry)) || - !slot_locked(mapping, slot)) { + WARN_ON_ONCE(!xa_is_value(entry)) || !dax_locked(entry)) { if (slotp) *slotp = slot; return entry; @@ -262,17 +242,19 @@ static void *get_unlocked_mapping_entry(struct address_space *mapping, static void dax_unlock_mapping_entry(struct address_space *mapping, pgoff_t index) { - void *entry, **slot; + XA_STATE(xas, &mapping->pages, index); + void *entry; - xa_lock_irq(&mapping->pages); - entry = __radix_tree_lookup(&mapping->pages, index, NULL, &slot); - if (WARN_ON_ONCE(!entry || !xa_is_value(entry) || - !slot_locked(mapping, slot))) { - xa_unlock_irq(&mapping->pages); + xas_lock_irq(&xas); + entry = xas_load(&xas); + if (WARN_ON_ONCE(!entry || !xa_is_value(entry) || !dax_locked(entry))) { + xas_unlock_irq(&xas); return; } - unlock_slot(mapping, slot); - xa_unlock_irq(&mapping->pages); + entry = xa_mk_value(xa_to_value(entry) & ~DAX_ENTRY_LOCK); + xas_store(&xas, entry); + /* Safe to not call xas_pause here -- we don't touch the array after */ + xas_unlock_irq(&xas); dax_wake_mapping_entry_waiter(mapping, index, entry, false); } -- 2.15.0