diff options
Diffstat (limited to 'include/linux/dax.h')
| -rw-r--r-- | include/linux/dax.h | 67 |
1 files changed, 65 insertions, 2 deletions
diff --git a/include/linux/dax.h b/include/linux/dax.h index 0dd316a74a29..9bd8528bd305 100644 --- a/include/linux/dax.h +++ b/include/linux/dax.h @@ -7,6 +7,9 @@ #include <linux/radix-tree.h> #include <asm/pgtable.h> +/* Flag for synchronous flush */ +#define DAXDEV_F_SYNC (1UL << 0) + typedef unsigned long dax_entry_t; struct iomap_ops; @@ -19,6 +22,12 @@ struct dax_operations { */ 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 *); @@ -32,18 +41,40 @@ 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); + 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); +} +/* + * 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) + const struct dax_operations *ops, unsigned long flags) { /* * Callers should check IS_ENABLED(CONFIG_DAX) to know if this @@ -64,6 +95,18 @@ 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 daxdev_mapping_supported(struct vm_area_struct *vma, + struct dax_device *dax_dev) +{ + return !(vma->vm_flags & VM_SYNC); +} #endif struct writeback_control; @@ -75,6 +118,17 @@ 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 struct dax_device *fs_dax_get_by_host(const char *host) { return dax_get_by_host(host); @@ -99,6 +153,13 @@ static inline bool bdev_dax_supported(struct block_device *bdev, 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 struct dax_device *fs_dax_get_by_host(const char *host) { return NULL; @@ -142,6 +203,8 @@ 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); +bool dax_supported(struct dax_device *dax_dev, struct block_device *bdev, + int blocksize, sector_t start, sector_t len); 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, |