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Release 4.16 include/linux/dax.h

Directory: include/linux
/* 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; }

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Dan J Williams17100.00%1100.00%
Total17100.00%1100.00%


static inline void put_dax(struct dax_device *dax_dev) { }

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Dan J Williams11100.00%1100.00%
Total11100.00%1100.00%

#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); }

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Dan J Williams23100.00%1100.00%
Total23100.00%1100.00%


static inline struct dax_device *fs_dax_get_by_host(const char *host) { return dax_get_by_host(host); }

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Dan J Williams20100.00%1100.00%
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static inline void fs_put_dax(struct dax_device *dax_dev) { put_dax(dax_dev); }

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Dan J Williams17100.00%1100.00%
Total17100.00%1100.00%

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; }

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Dan J Williams19100.00%1100.00%
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static inline struct dax_device *fs_dax_get_by_host(const char *host) { return NULL; }

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Dan J Williams17100.00%3100.00%
Total17100.00%3100.00%


static inline void fs_put_dax(struct dax_device *dax_dev) { }

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Dan J Williams11100.00%3100.00%
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static inline struct dax_device *fs_dax_get_by_bdev(struct block_device *bdev) { return NULL; }

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Dan J Williams17100.00%1100.00%
Total17100.00%1100.00%

#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; }

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Christoph Hellwig2784.38%150.00%
Dan J Williams515.62%150.00%
Total32100.00%2100.00%

#endif
static inline bool dax_mapping(struct address_space *mapping) { return mapping->host && IS_DAX(mapping->host); }

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Ross Zwisler24100.00%1100.00%
Total24100.00%1100.00%

struct writeback_control; int dax_writeback_mapping_range(struct address_space *mapping, struct block_device *bdev, struct writeback_control *wbc); #endif

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Dan J Williams44367.33%1442.42%
Christoph Hellwig8212.46%412.12%
Jan Kara507.60%618.18%
Ross Zwisler487.29%412.12%
Matthew Wilcox213.19%26.06%
Vivek Goyal91.37%13.03%
Dave Jiang40.61%13.03%
Greg Kroah-Hartman10.15%13.03%
Total658100.00%33100.00%
Directory: include/linux
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