mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-28 03:58:02 +07:00
a7d73fe6c5
Very similar to the existing dax_fault function, but instead of using the get_block callback we rely on the iomap_ops vector from iomap.c. That also avoids having to do two calls into the file system for write faults. Signed-off-by: Christoph Hellwig <hch@lst.de> Reviewed-by: Ross Zwisler <ross.zwisler@linux.intel.com> Signed-off-by: Dave Chinner <david@fromorbit.com>
78 lines
2.5 KiB
C
78 lines
2.5 KiB
C
#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;
|
|
|
|
/* We use lowest available exceptional entry bit for locking */
|
|
#define RADIX_DAX_ENTRY_LOCK (1 << RADIX_TREE_EXCEPTIONAL_SHIFT)
|
|
|
|
ssize_t iomap_dax_rw(struct kiocb *iocb, struct iov_iter *iter,
|
|
struct iomap_ops *ops);
|
|
ssize_t dax_do_io(struct kiocb *, struct inode *, struct iov_iter *,
|
|
get_block_t, dio_iodone_t, int flags);
|
|
int dax_zero_page_range(struct inode *, loff_t from, unsigned len, get_block_t);
|
|
int dax_truncate_page(struct inode *, loff_t from, get_block_t);
|
|
int iomap_dax_fault(struct vm_area_struct *vma, struct vm_fault *vmf,
|
|
struct iomap_ops *ops);
|
|
int dax_fault(struct vm_area_struct *, struct vm_fault *, get_block_t);
|
|
int dax_delete_mapping_entry(struct address_space *mapping, pgoff_t index);
|
|
void dax_wake_mapping_entry_waiter(struct address_space *mapping,
|
|
pgoff_t index, bool wake_all);
|
|
|
|
#ifdef CONFIG_FS_DAX
|
|
struct page *read_dax_sector(struct block_device *bdev, sector_t n);
|
|
void dax_unlock_mapping_entry(struct address_space *mapping, pgoff_t index);
|
|
int __dax_zero_page_range(struct block_device *bdev, sector_t sector,
|
|
unsigned int offset, unsigned int length);
|
|
#else
|
|
static inline struct page *read_dax_sector(struct block_device *bdev,
|
|
sector_t n)
|
|
{
|
|
return ERR_PTR(-ENXIO);
|
|
}
|
|
/* Shouldn't ever be called when dax is disabled. */
|
|
static inline void dax_unlock_mapping_entry(struct address_space *mapping,
|
|
pgoff_t index)
|
|
{
|
|
BUG();
|
|
}
|
|
static inline int __dax_zero_page_range(struct block_device *bdev,
|
|
sector_t sector, unsigned int offset, unsigned int length)
|
|
{
|
|
return -ENXIO;
|
|
}
|
|
#endif
|
|
|
|
#if defined(CONFIG_TRANSPARENT_HUGEPAGE)
|
|
int dax_pmd_fault(struct vm_area_struct *, unsigned long addr, pmd_t *,
|
|
unsigned int flags, get_block_t);
|
|
#else
|
|
static inline int dax_pmd_fault(struct vm_area_struct *vma, unsigned long addr,
|
|
pmd_t *pmd, unsigned int flags, get_block_t gb)
|
|
{
|
|
return VM_FAULT_FALLBACK;
|
|
}
|
|
#endif
|
|
int dax_pfn_mkwrite(struct vm_area_struct *, struct vm_fault *);
|
|
#define dax_mkwrite(vma, vmf, gb) dax_fault(vma, vmf, gb)
|
|
|
|
static inline bool vma_is_dax(struct vm_area_struct *vma)
|
|
{
|
|
return vma->vm_file && IS_DAX(vma->vm_file->f_mapping->host);
|
|
}
|
|
|
|
static inline bool dax_mapping(struct address_space *mapping)
|
|
{
|
|
return mapping->host && IS_DAX(mapping->host);
|
|
}
|
|
|
|
struct writeback_control;
|
|
int dax_writeback_mapping_range(struct address_space *mapping,
|
|
struct block_device *bdev, struct writeback_control *wbc);
|
|
#endif
|