255 строки
7.4 KiB
C
255 строки
7.4 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
|
|
#ifndef _LINUX_DAX_H
|
|
#define _LINUX_DAX_H
|
|
|
|
#include <linux/fs.h>
|
|
#include <linux/mm.h>
|
|
#include <linux/radix-tree.h>
|
|
|
|
/* Flag for synchronous flush */
|
|
#define DAXDEV_F_SYNC (1UL << 0)
|
|
|
|
typedef unsigned long dax_entry_t;
|
|
|
|
struct iomap_ops;
|
|
struct iomap;
|
|
struct dax_device;
|
|
struct dax_operations {
|
|
/*
|
|
* direct_access: translate a device-relative
|
|
* logical-page-offset into an absolute physical pfn. Return the
|
|
* number of pages available for DAX at that pfn.
|
|
*/
|
|
long (*direct_access)(struct dax_device *, pgoff_t, long,
|
|
void **, pfn_t *);
|
|
/*
|
|
* Validate whether this device is usable as an fsdax backing
|
|
* device.
|
|
*/
|
|
bool (*dax_supported)(struct dax_device *, struct block_device *, int,
|
|
sector_t, sector_t);
|
|
/* copy_from_iter: required operation for fs-dax direct-i/o */
|
|
size_t (*copy_from_iter)(struct dax_device *, pgoff_t, void *, size_t,
|
|
struct iov_iter *);
|
|
/* copy_to_iter: required operation for fs-dax direct-i/o */
|
|
size_t (*copy_to_iter)(struct dax_device *, pgoff_t, void *, size_t,
|
|
struct iov_iter *);
|
|
/* zero_page_range: required operation. Zero page range */
|
|
int (*zero_page_range)(struct dax_device *, pgoff_t, size_t);
|
|
};
|
|
|
|
extern struct attribute_group dax_attribute_group;
|
|
|
|
#if IS_ENABLED(CONFIG_DAX)
|
|
struct dax_device *dax_get_by_host(const char *host);
|
|
struct dax_device *alloc_dax(void *private, const char *host,
|
|
const struct dax_operations *ops, unsigned long flags);
|
|
void put_dax(struct dax_device *dax_dev);
|
|
void kill_dax(struct dax_device *dax_dev);
|
|
void dax_write_cache(struct dax_device *dax_dev, bool wc);
|
|
bool dax_write_cache_enabled(struct dax_device *dax_dev);
|
|
bool __dax_synchronous(struct dax_device *dax_dev);
|
|
static inline bool dax_synchronous(struct dax_device *dax_dev)
|
|
{
|
|
return __dax_synchronous(dax_dev);
|
|
}
|
|
void __set_dax_synchronous(struct dax_device *dax_dev);
|
|
static inline void set_dax_synchronous(struct dax_device *dax_dev)
|
|
{
|
|
__set_dax_synchronous(dax_dev);
|
|
}
|
|
bool dax_supported(struct dax_device *dax_dev, struct block_device *bdev,
|
|
int blocksize, sector_t start, sector_t len);
|
|
/*
|
|
* Check if given mapping is supported by the file / underlying device.
|
|
*/
|
|
static inline bool daxdev_mapping_supported(struct vm_area_struct *vma,
|
|
struct dax_device *dax_dev)
|
|
{
|
|
if (!(vma->vm_flags & VM_SYNC))
|
|
return true;
|
|
if (!IS_DAX(file_inode(vma->vm_file)))
|
|
return false;
|
|
return dax_synchronous(dax_dev);
|
|
}
|
|
#else
|
|
static inline struct dax_device *dax_get_by_host(const char *host)
|
|
{
|
|
return NULL;
|
|
}
|
|
static inline struct dax_device *alloc_dax(void *private, const char *host,
|
|
const struct dax_operations *ops, unsigned long flags)
|
|
{
|
|
/*
|
|
* Callers should check IS_ENABLED(CONFIG_DAX) to know if this
|
|
* NULL is an error or expected.
|
|
*/
|
|
return NULL;
|
|
}
|
|
static inline void put_dax(struct dax_device *dax_dev)
|
|
{
|
|
}
|
|
static inline void kill_dax(struct dax_device *dax_dev)
|
|
{
|
|
}
|
|
static inline void dax_write_cache(struct dax_device *dax_dev, bool wc)
|
|
{
|
|
}
|
|
static inline bool dax_write_cache_enabled(struct dax_device *dax_dev)
|
|
{
|
|
return false;
|
|
}
|
|
static inline bool dax_synchronous(struct dax_device *dax_dev)
|
|
{
|
|
return true;
|
|
}
|
|
static inline void set_dax_synchronous(struct dax_device *dax_dev)
|
|
{
|
|
}
|
|
static inline bool dax_supported(struct dax_device *dax_dev,
|
|
struct block_device *bdev, int blocksize, sector_t start,
|
|
sector_t len)
|
|
{
|
|
return false;
|
|
}
|
|
static inline bool daxdev_mapping_supported(struct vm_area_struct *vma,
|
|
struct dax_device *dax_dev)
|
|
{
|
|
return !(vma->vm_flags & VM_SYNC);
|
|
}
|
|
#endif
|
|
|
|
struct writeback_control;
|
|
int bdev_dax_pgoff(struct block_device *, sector_t, size_t, pgoff_t *pgoff);
|
|
#if IS_ENABLED(CONFIG_FS_DAX)
|
|
bool __bdev_dax_supported(struct block_device *bdev, int blocksize);
|
|
static inline bool bdev_dax_supported(struct block_device *bdev, int blocksize)
|
|
{
|
|
return __bdev_dax_supported(bdev, blocksize);
|
|
}
|
|
|
|
bool __generic_fsdax_supported(struct dax_device *dax_dev,
|
|
struct block_device *bdev, int blocksize, sector_t start,
|
|
sector_t sectors);
|
|
static inline bool generic_fsdax_supported(struct dax_device *dax_dev,
|
|
struct block_device *bdev, int blocksize, sector_t start,
|
|
sector_t sectors)
|
|
{
|
|
return __generic_fsdax_supported(dax_dev, bdev, blocksize, start,
|
|
sectors);
|
|
}
|
|
|
|
static inline void fs_put_dax(struct dax_device *dax_dev)
|
|
{
|
|
put_dax(dax_dev);
|
|
}
|
|
|
|
struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev);
|
|
int dax_writeback_mapping_range(struct address_space *mapping,
|
|
struct dax_device *dax_dev, struct writeback_control *wbc);
|
|
|
|
struct page *dax_layout_busy_page(struct address_space *mapping);
|
|
struct page *dax_layout_busy_page_range(struct address_space *mapping, loff_t start, loff_t end);
|
|
dax_entry_t dax_lock_page(struct page *page);
|
|
void dax_unlock_page(struct page *page, dax_entry_t cookie);
|
|
#else
|
|
static inline bool bdev_dax_supported(struct block_device *bdev,
|
|
int blocksize)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline bool generic_fsdax_supported(struct dax_device *dax_dev,
|
|
struct block_device *bdev, int blocksize, sector_t start,
|
|
sector_t sectors)
|
|
{
|
|
return false;
|
|
}
|
|
|
|
static inline void fs_put_dax(struct dax_device *dax_dev)
|
|
{
|
|
}
|
|
|
|
static inline struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline struct page *dax_layout_busy_page(struct address_space *mapping)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline struct page *dax_layout_busy_page_range(struct address_space *mapping, pgoff_t start, pgoff_t nr_pages)
|
|
{
|
|
return NULL;
|
|
}
|
|
|
|
static inline int dax_writeback_mapping_range(struct address_space *mapping,
|
|
struct dax_device *dax_dev, struct writeback_control *wbc)
|
|
{
|
|
return -EOPNOTSUPP;
|
|
}
|
|
|
|
static inline dax_entry_t dax_lock_page(struct page *page)
|
|
{
|
|
if (IS_DAX(page->mapping->host))
|
|
return ~0UL;
|
|
return 0;
|
|
}
|
|
|
|
static inline void dax_unlock_page(struct page *page, dax_entry_t cookie)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
#if IS_ENABLED(CONFIG_DAX)
|
|
int dax_read_lock(void);
|
|
void dax_read_unlock(int id);
|
|
#else
|
|
static inline int dax_read_lock(void)
|
|
{
|
|
return 0;
|
|
}
|
|
|
|
static inline void dax_read_unlock(int id)
|
|
{
|
|
}
|
|
#endif /* CONFIG_DAX */
|
|
bool dax_alive(struct dax_device *dax_dev);
|
|
void *dax_get_private(struct dax_device *dax_dev);
|
|
long dax_direct_access(struct dax_device *dax_dev, pgoff_t pgoff, long nr_pages,
|
|
void **kaddr, pfn_t *pfn);
|
|
size_t dax_copy_from_iter(struct dax_device *dax_dev, pgoff_t pgoff, void *addr,
|
|
size_t bytes, struct iov_iter *i);
|
|
size_t dax_copy_to_iter(struct dax_device *dax_dev, pgoff_t pgoff, void *addr,
|
|
size_t bytes, struct iov_iter *i);
|
|
int dax_zero_page_range(struct dax_device *dax_dev, pgoff_t pgoff,
|
|
size_t nr_pages);
|
|
void dax_flush(struct dax_device *dax_dev, void *addr, size_t size);
|
|
|
|
ssize_t dax_iomap_rw(struct kiocb *iocb, struct iov_iter *iter,
|
|
const struct iomap_ops *ops);
|
|
vm_fault_t dax_iomap_fault(struct vm_fault *vmf, enum page_entry_size pe_size,
|
|
pfn_t *pfnp, int *errp, const struct iomap_ops *ops);
|
|
vm_fault_t dax_finish_sync_fault(struct vm_fault *vmf,
|
|
enum page_entry_size pe_size, pfn_t pfn);
|
|
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);
|
|
s64 dax_iomap_zero(loff_t pos, u64 length, struct iomap *iomap);
|
|
static inline bool dax_mapping(struct address_space *mapping)
|
|
{
|
|
return mapping->host && IS_DAX(mapping->host);
|
|
}
|
|
|
|
#ifdef CONFIG_DEV_DAX_HMEM_DEVICES
|
|
void hmem_register_device(int target_nid, struct resource *r);
|
|
#else
|
|
static inline void hmem_register_device(int target_nid, struct resource *r)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
#endif
|