Release 4.16 include/linux/dax.h
/* 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>
#include <asm/pgtable.h>
struct iomap_ops;
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 *);
/* 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 *);
};
extern struct attribute_group dax_attribute_group;
#if IS_ENABLED(CONFIG_DAX)
struct dax_device *dax_get_by_host(const char *host);
void put_dax(struct dax_device *dax_dev);
#else
static inline struct dax_device *dax_get_by_host(const char *host)
{
return NULL;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Dan J Williams | 17 | 100.00% | 1 | 100.00% |
Total | 17 | 100.00% | 1 | 100.00% |
static inline void put_dax(struct dax_device *dax_dev)
{
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Dan J Williams | 11 | 100.00% | 1 | 100.00% |
Total | 11 | 100.00% | 1 | 100.00% |
#endif
int bdev_dax_pgoff(struct block_device *, sector_t, size_t, pgoff_t *pgoff);
#if IS_ENABLED(CONFIG_FS_DAX)
int __bdev_dax_supported(struct super_block *sb, int blocksize);
static inline int bdev_dax_supported(struct super_block *sb, int blocksize)
{
return __bdev_dax_supported(sb, blocksize);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Dan J Williams | 23 | 100.00% | 1 | 100.00% |
Total | 23 | 100.00% | 1 | 100.00% |
static inline struct dax_device *fs_dax_get_by_host(const char *host)
{
return dax_get_by_host(host);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Dan J Williams | 20 | 100.00% | 1 | 100.00% |
Total | 20 | 100.00% | 1 | 100.00% |
static inline void fs_put_dax(struct dax_device *dax_dev)
{
put_dax(dax_dev);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Dan J Williams | 17 | 100.00% | 1 | 100.00% |
Total | 17 | 100.00% | 1 | 100.00% |
struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev);
#else
static inline int bdev_dax_supported(struct super_block *sb, int blocksize)
{
return -EOPNOTSUPP;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Dan J Williams | 19 | 100.00% | 1 | 100.00% |
Total | 19 | 100.00% | 1 | 100.00% |
static inline struct dax_device *fs_dax_get_by_host(const char *host)
{
return NULL;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Dan J Williams | 17 | 100.00% | 3 | 100.00% |
Total | 17 | 100.00% | 3 | 100.00% |
static inline void fs_put_dax(struct dax_device *dax_dev)
{
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Dan J Williams | 11 | 100.00% | 3 | 100.00% |
Total | 11 | 100.00% | 3 | 100.00% |
static inline struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev)
{
return NULL;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Dan J Williams | 17 | 100.00% | 1 | 100.00% |
Total | 17 | 100.00% | 1 | 100.00% |
#endif
int dax_read_lock(void);
void dax_read_unlock(int id);
struct dax_device *alloc_dax(void *private, const char *host,
const struct dax_operations *ops);
bool dax_alive(struct dax_device *dax_dev);
void kill_dax(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);
void dax_flush(struct dax_device *dax_dev, void *addr, size_t size);
void dax_write_cache(struct dax_device *dax_dev, bool wc);
bool dax_write_cache_enabled(struct dax_device *dax_dev);
ssize_t dax_iomap_rw(struct kiocb *iocb, struct iov_iter *iter,
const struct iomap_ops *ops);
int dax_iomap_fault(struct vm_fault *vmf, enum page_entry_size pe_size,
pfn_t *pfnp, int *errp, const struct iomap_ops *ops);
int 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);
#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;
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Christoph Hellwig | 27 | 84.38% | 1 | 50.00% |
Dan J Williams | 5 | 15.62% | 1 | 50.00% |
Total | 32 | 100.00% | 2 | 100.00% |
#endif
static inline bool dax_mapping(struct address_space *mapping)
{
return mapping->host && IS_DAX(mapping->host);
}
Contributors
Person | Tokens | Prop | Commits | CommitProp |
Ross Zwisler | 24 | 100.00% | 1 | 100.00% |
Total | 24 | 100.00% | 1 | 100.00% |
struct writeback_control;
int dax_writeback_mapping_range(struct address_space *mapping,
struct block_device *bdev, struct writeback_control *wbc);
#endif
Overall Contributors
Person | Tokens | Prop | Commits | CommitProp |
Dan J Williams | 443 | 67.33% | 14 | 42.42% |
Christoph Hellwig | 82 | 12.46% | 4 | 12.12% |
Jan Kara | 50 | 7.60% | 6 | 18.18% |
Ross Zwisler | 48 | 7.29% | 4 | 12.12% |
Matthew Wilcox | 21 | 3.19% | 2 | 6.06% |
Vivek Goyal | 9 | 1.37% | 1 | 3.03% |
Dave Jiang | 4 | 0.61% | 1 | 3.03% |
Greg Kroah-Hartman | 1 | 0.15% | 1 | 3.03% |
Total | 658 | 100.00% | 33 | 100.00% |
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