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