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dax,iomap: Add helper dax_iomap_zero() to zero a range 

Add a helper dax_ioamp_zero() to zero a range. This patch basically
merges __dax_zero_page_range() and iomap_dax_zero().

Suggested-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Vivek Goyal <vgoyal@redhat.com>
Reviewed-by: Christoph Hellwig <hch@lst.de>
Link: https://lore.kernel.org/r/20200228163456.1587-7-vgoyal@redhat.com
Signed-off-by: Dan Williams <dan.j.williams@intel.com>
This commit is contained in:
Vivek Goyal 2020-02-28 11:34:56 -05:00 committed by Dan Williams
parent 0a23f9ffa5
commit 4f3b4f161d
3 changed files with 12 additions and 30 deletions
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16
fs/dax.c
View File

@ -1038,10 +1038,10 @@ static vm_fault_t dax_load_hole(struct xa_state *xas,
return ret;
}
int __dax_zero_page_range(struct block_device *bdev,
struct dax_device *dax_dev, sector_t sector,
unsigned int offset, unsigned int size)
int dax_iomap_zero(loff_t pos, unsigned offset, unsigned size,
struct iomap *iomap)
{
sector_t sector = iomap_sector(iomap, pos & PAGE_MASK);
pgoff_t pgoff;
long rc, id;
void *kaddr;
@ -1052,16 +1052,17 @@ int __dax_zero_page_range(struct block_device *bdev,
IS_ALIGNED(size, PAGE_SIZE))
page_aligned = true;
rc = bdev_dax_pgoff(bdev, sector, PAGE_SIZE, &pgoff);
rc = bdev_dax_pgoff(iomap->bdev, sector, PAGE_SIZE, &pgoff);
if (rc)
return rc;
id = dax_read_lock();
if (page_aligned)
rc = dax_zero_page_range(dax_dev, pgoff, size >> PAGE_SHIFT);
rc = dax_zero_page_range(iomap->dax_dev, pgoff,
size >> PAGE_SHIFT);
else
rc = dax_direct_access(dax_dev, pgoff, 1, &kaddr, NULL);
rc = dax_direct_access(iomap->dax_dev, pgoff, 1, &kaddr, NULL);
if (rc < 0) {
dax_read_unlock(id);
return rc;
@ -1069,12 +1070,11 @@ int __dax_zero_page_range(struct block_device *bdev,
if (!page_aligned) {
memset(kaddr + offset, 0, size);
dax_flush(dax_dev, kaddr + offset, size);
dax_flush(iomap->dax_dev, kaddr + offset, size);
}
dax_read_unlock(id);
return 0;
}
EXPORT_SYMBOL_GPL(__dax_zero_page_range);
static loff_t
dax_iomap_actor(struct inode *inode, loff_t pos, loff_t length, void *data,

9
fs/iomap/buffered-io.c
View File

@ -974,13 +974,6 @@ static int iomap_zero(struct inode *inode, loff_t pos, unsigned offset,
return iomap_write_end(inode, pos, bytes, bytes, page, iomap, srcmap);
}
static int iomap_dax_zero(loff_t pos, unsigned offset, unsigned bytes,
struct iomap *iomap)
{
return __dax_zero_page_range(iomap->bdev, iomap->dax_dev,
iomap_sector(iomap, pos & PAGE_MASK), offset, bytes);
}
static loff_t
iomap_zero_range_actor(struct inode *inode, loff_t pos, loff_t count,
void *data, struct iomap *iomap, struct iomap *srcmap)
@ -1000,7 +993,7 @@ iomap_zero_range_actor(struct inode *inode, loff_t pos, loff_t count,
bytes = min_t(loff_t, PAGE_SIZE - offset, count);
if (IS_DAX(inode))
status = iomap_dax_zero(pos, offset, bytes, iomap);
status = dax_iomap_zero(pos, offset, bytes, iomap);
else
status = iomap_zero(inode, pos, offset, bytes, iomap,
srcmap);

17
include/linux/dax.h
View File

@ -13,6 +13,7 @@
typedef unsigned long dax_entry_t;
struct iomap_ops;
struct iomap;
struct dax_device;
struct dax_operations {
/*
@ -214,20 +215,8 @@ vm_fault_t dax_finish_sync_fault(struct vm_fault *vmf,
int dax_delete_mapping_entry(struct address_space *mapping, pgoff_t index);
int dax_invalidate_mapping_entry_sync(struct address_space *mapping,
pgoff_t index);
#ifdef CONFIG_FS_DAX
int __dax_zero_page_range(struct block_device *bdev,
struct dax_device *dax_dev, sector_t sector,
unsigned int offset, unsigned int length);
#else
static inline int __dax_zero_page_range(struct block_device *bdev,
struct dax_device *dax_dev, sector_t sector,
unsigned int offset, unsigned int length)
{
return -ENXIO;
}
#endif
int dax_iomap_zero(loff_t pos, unsigned offset, unsigned size,
struct iomap *iomap);
static inline bool dax_mapping(struct address_space *mapping)
{
return mapping->host && IS_DAX(mapping->host);