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Message-Id: <20170628220152.28161-3-ross.zwisler@linux.intel.com>
Date: Wed, 28 Jun 2017 16:01:49 -0600
From: Ross Zwisler <ross.zwisler@...ux.intel.com>
To: Andrew Morton <akpm@...ux-foundation.org>,
linux-kernel@...r.kernel.org
Cc: Ross Zwisler <ross.zwisler@...ux.intel.com>,
"Darrick J. Wong" <darrick.wong@...cle.com>,
"Theodore Ts'o" <tytso@....edu>,
Alexander Viro <viro@...iv.linux.org.uk>,
Andreas Dilger <adilger.kernel@...ger.ca>,
Christoph Hellwig <hch@....de>,
Dan Williams <dan.j.williams@...el.com>,
Dave Hansen <dave.hansen@...el.com>,
Ingo Molnar <mingo@...hat.com>, Jan Kara <jack@...e.cz>,
Jonathan Corbet <corbet@....net>,
Matthew Wilcox <mawilcox@...rosoft.com>,
Steven Rostedt <rostedt@...dmis.org>,
linux-doc@...r.kernel.org, linux-ext4@...r.kernel.org,
linux-fsdevel@...r.kernel.org, linux-mm@...ck.org,
linux-nvdimm@...ts.01.org, linux-xfs@...r.kernel.org
Subject: [PATCH v3 2/5] dax: relocate some dax functions
dax_load_hole() will soon need to call dax_insert_mapping_entry(), so it
needs to be moved lower in dax.c so the definition exists.
dax_wake_mapping_entry_waiter() will soon be removed from dax.h and be made
static to dax.c, so we need to move its definition above all its callers.
Signed-off-by: Ross Zwisler <ross.zwisler@...ux.intel.com>
---
fs/dax.c | 138 +++++++++++++++++++++++++++++++--------------------------------
1 file changed, 69 insertions(+), 69 deletions(-)
diff --git a/fs/dax.c b/fs/dax.c
index 9187f3b..e850837 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -122,6 +122,31 @@ static int wake_exceptional_entry_func(wait_queue_t *wait, unsigned int mode,
}
/*
+ * We do not necessarily hold the mapping->tree_lock when we call this
+ * function so it is possible that 'entry' is no longer a valid item in the
+ * radix tree. This is okay because all we really need to do is to find the
+ * correct waitqueue where tasks might be waiting for that old 'entry' and
+ * wake them.
+ */
+void dax_wake_mapping_entry_waiter(struct address_space *mapping,
+ pgoff_t index, void *entry, bool wake_all)
+{
+ struct exceptional_entry_key key;
+ wait_queue_head_t *wq;
+
+ wq = dax_entry_waitqueue(mapping, index, entry, &key);
+
+ /*
+ * Checking for locked entry and prepare_to_wait_exclusive() happens
+ * under mapping->tree_lock, ditto for entry handling in our callers.
+ * So at this point all tasks that could have seen our entry locked
+ * must be in the waitqueue and the following check will see them.
+ */
+ if (waitqueue_active(wq))
+ __wake_up(wq, TASK_NORMAL, wake_all ? 0 : 1, &key);
+}
+
+/*
* Check whether the given slot is locked. The function must be called with
* mapping->tree_lock held
*/
@@ -393,31 +418,6 @@ static void *grab_mapping_entry(struct address_space *mapping, pgoff_t index,
return entry;
}
-/*
- * We do not necessarily hold the mapping->tree_lock when we call this
- * function so it is possible that 'entry' is no longer a valid item in the
- * radix tree. This is okay because all we really need to do is to find the
- * correct waitqueue where tasks might be waiting for that old 'entry' and
- * wake them.
- */
-void dax_wake_mapping_entry_waiter(struct address_space *mapping,
- pgoff_t index, void *entry, bool wake_all)
-{
- struct exceptional_entry_key key;
- wait_queue_head_t *wq;
-
- wq = dax_entry_waitqueue(mapping, index, entry, &key);
-
- /*
- * Checking for locked entry and prepare_to_wait_exclusive() happens
- * under mapping->tree_lock, ditto for entry handling in our callers.
- * So at this point all tasks that could have seen our entry locked
- * must be in the waitqueue and the following check will see them.
- */
- if (waitqueue_active(wq))
- __wake_up(wq, TASK_NORMAL, wake_all ? 0 : 1, &key);
-}
-
static int __dax_invalidate_mapping_entry(struct address_space *mapping,
pgoff_t index, bool trunc)
{
@@ -469,50 +469,6 @@ int dax_invalidate_mapping_entry_sync(struct address_space *mapping,
return __dax_invalidate_mapping_entry(mapping, index, false);
}
-/*
- * The user has performed a load from a hole in the file. Allocating
- * a new page in the file would cause excessive storage usage for
- * workloads with sparse files. We allocate a page cache page instead.
- * We'll kick it out of the page cache if it's ever written to,
- * otherwise it will simply fall out of the page cache under memory
- * pressure without ever having been dirtied.
- */
-static int dax_load_hole(struct address_space *mapping, void **entry,
- struct vm_fault *vmf)
-{
- struct inode *inode = mapping->host;
- struct page *page;
- int ret;
-
- /* Hole page already exists? Return it... */
- if (!radix_tree_exceptional_entry(*entry)) {
- page = *entry;
- goto finish_fault;
- }
-
- /* This will replace locked radix tree entry with a hole page */
- page = find_or_create_page(mapping, vmf->pgoff,
- vmf->gfp_mask | __GFP_ZERO);
- if (!page) {
- ret = VM_FAULT_OOM;
- goto out;
- }
-
-finish_fault:
- vmf->page = page;
- ret = finish_fault(vmf);
- vmf->page = NULL;
- *entry = page;
- if (!ret) {
- /* Grab reference for PTE that is now referencing the page */
- get_page(page);
- ret = VM_FAULT_NOPAGE;
- }
-out:
- trace_dax_load_hole(inode, vmf, ret);
- return ret;
-}
-
static int copy_user_dax(struct block_device *bdev, struct dax_device *dax_dev,
sector_t sector, size_t size, struct page *to,
unsigned long vaddr)
@@ -937,6 +893,50 @@ int dax_pfn_mkwrite(struct vm_fault *vmf)
}
EXPORT_SYMBOL_GPL(dax_pfn_mkwrite);
+/*
+ * The user has performed a load from a hole in the file. Allocating
+ * a new page in the file would cause excessive storage usage for
+ * workloads with sparse files. We allocate a page cache page instead.
+ * We'll kick it out of the page cache if it's ever written to,
+ * otherwise it will simply fall out of the page cache under memory
+ * pressure without ever having been dirtied.
+ */
+static int dax_load_hole(struct address_space *mapping, void **entry,
+ struct vm_fault *vmf)
+{
+ struct inode *inode = mapping->host;
+ struct page *page;
+ int ret;
+
+ /* Hole page already exists? Return it... */
+ if (!radix_tree_exceptional_entry(*entry)) {
+ page = *entry;
+ goto finish_fault;
+ }
+
+ /* This will replace locked radix tree entry with a hole page */
+ page = find_or_create_page(mapping, vmf->pgoff,
+ vmf->gfp_mask | __GFP_ZERO);
+ if (!page) {
+ ret = VM_FAULT_OOM;
+ goto out;
+ }
+
+finish_fault:
+ vmf->page = page;
+ ret = finish_fault(vmf);
+ vmf->page = NULL;
+ *entry = page;
+ if (!ret) {
+ /* Grab reference for PTE that is now referencing the page */
+ get_page(page);
+ ret = VM_FAULT_NOPAGE;
+ }
+out:
+ trace_dax_load_hole(inode, vmf, ret);
+ return ret;
+}
+
static bool dax_range_is_aligned(struct block_device *bdev,
unsigned int offset, unsigned int length)
{
--
2.9.4
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