linux-ext4 - [PATCH 02/13] dax: Simplify arguments of dax_insert

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Message-Id: <20170817160815.30466-3-jack@suse.cz>
Date:   Thu, 17 Aug 2017 18:08:04 +0200
From:   Jan Kara <jack@...e.cz>
To:     <linux-fsdevel@...r.kernel.org>
Cc:     linux-nvdimm@...ts.01.org, Andy Lutomirski <luto@...nel.org>,
        <linux-ext4@...r.kernel.org>, <linux-xfs@...r.kernel.org>,
        Christoph Hellwig <hch@...radead.org>,
        Ross Zwisler <ross.zwisler@...ux.intel.com>,
        Dan Williams <dan.j.williams@...el.com>,
        Boaz Harrosh <boazh@...app.com>, Jan Kara <jack@...e.cz>
Subject: [PATCH 02/13] dax: Simplify arguments of dax_insert_mapping()

dax_insert_mapping() has lots of arguments and a lot of them is actuall
duplicated by passing vm_fault structure as well. Change the function to
take the same arguments as dax_pmd_insert_mapping().

Reviewed-by: Ross Zwisler <ross.zwisler@...ux.intel.com>
Reviewed-by: Christoph Hellwig <hch@....de>
Signed-off-by: Jan Kara <jack@...e.cz>
---
 fs/dax.c | 32 ++++++++++++++++----------------
 1 file changed, 16 insertions(+), 16 deletions(-)

diff --git a/fs/dax.c b/fs/dax.c
index 75760f7bdf5d..fbbb6d176987 100644
--- a/fs/dax.c
+++ b/fs/dax.c
@@ -814,23 +814,30 @@ int dax_writeback_mapping_range(struct address_space *mapping,
 }
 EXPORT_SYMBOL_GPL(dax_writeback_mapping_range);
 
-static int dax_insert_mapping(struct address_space *mapping,
-		struct block_device *bdev, struct dax_device *dax_dev,
-		sector_t sector, size_t size, void *entry,
-		struct vm_area_struct *vma, struct vm_fault *vmf)
+static sector_t dax_iomap_sector(struct iomap *iomap, loff_t pos)
+{
+	return iomap->blkno + (((pos & PAGE_MASK) - iomap->offset) >> 9);
+}
+
+static int dax_insert_mapping(struct vm_fault *vmf, struct iomap *iomap,
+			      loff_t pos, void *entry)
 {
+	const sector_t sector = dax_iomap_sector(iomap, pos);
+	struct vm_area_struct *vma = vmf->vma;
+	struct address_space *mapping = vma->vm_file->f_mapping;
 	unsigned long vaddr = vmf->address;
 	void *ret, *kaddr;
 	pgoff_t pgoff;
 	int id, rc;
 	pfn_t pfn;
 
-	rc = bdev_dax_pgoff(bdev, sector, size, &pgoff);
+	rc = bdev_dax_pgoff(iomap->bdev, sector, PAGE_SIZE, &pgoff);
 	if (rc)
 		return rc;
 
 	id = dax_read_lock();
-	rc = dax_direct_access(dax_dev, pgoff, PHYS_PFN(size), &kaddr, &pfn);
+	rc = dax_direct_access(iomap->dax_dev, pgoff, PHYS_PFN(PAGE_SIZE),
+			       &kaddr, &pfn);
 	if (rc < 0) {
 		dax_read_unlock(id);
 		return rc;
@@ -930,11 +937,6 @@ int __dax_zero_page_range(struct block_device *bdev,
 }
 EXPORT_SYMBOL_GPL(__dax_zero_page_range);
 
-static sector_t dax_iomap_sector(struct iomap *iomap, loff_t pos)
-{
-	return iomap->blkno + (((pos & PAGE_MASK) - iomap->offset) >> 9);
-}
-
 static loff_t
 dax_iomap_actor(struct inode *inode, loff_t pos, loff_t length, void *data,
 		struct iomap *iomap)
@@ -1076,7 +1078,6 @@ static int dax_iomap_pte_fault(struct vm_fault *vmf,
 	struct inode *inode = mapping->host;
 	unsigned long vaddr = vmf->address;
 	loff_t pos = (loff_t)vmf->pgoff << PAGE_SHIFT;
-	sector_t sector;
 	struct iomap iomap = { 0 };
 	unsigned flags = IOMAP_FAULT;
 	int error, major = 0;
@@ -1129,9 +1130,9 @@ static int dax_iomap_pte_fault(struct vm_fault *vmf,
 		goto error_finish_iomap;
 	}
 
-	sector = dax_iomap_sector(&iomap, pos);
-
 	if (vmf->cow_page) {
+		sector_t sector = dax_iomap_sector(&iomap, pos);
+
 		switch (iomap.type) {
 		case IOMAP_HOLE:
 		case IOMAP_UNWRITTEN:
@@ -1164,8 +1165,7 @@ static int dax_iomap_pte_fault(struct vm_fault *vmf,
 			count_memcg_event_mm(vmf->vma->vm_mm, PGMAJFAULT);
 			major = VM_FAULT_MAJOR;
 		}
-		error = dax_insert_mapping(mapping, iomap.bdev, iomap.dax_dev,
-				sector, PAGE_SIZE, entry, vmf->vma, vmf);
+		error = dax_insert_mapping(vmf, &iomap, pos, entry);
 		/* -EBUSY is fine, somebody else faulted on the same PTE */
 		if (error == -EBUSY)
 			error = 0;
-- 
2.12.3