Release 4.12 include/linux/dax.h
#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 *);
};
#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% |
#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% |
#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);
/*
* We use lowest available bit in exceptional entry for locking, one bit for
* the entry size (PMD) and two more to tell us if the entry is a huge zero
* page (HZP) or an empty entry that is just used for locking. In total four
* special bits.
*
* If the PMD bit isn't set the entry has size PAGE_SIZE, and if the HZP and
* EMPTY bits aren't set the entry is a normal DAX entry with a filesystem
* block allocation.
*/
#define RADIX_DAX_SHIFT (RADIX_TREE_EXCEPTIONAL_SHIFT + 4)
#define RADIX_DAX_ENTRY_LOCK (1 << RADIX_TREE_EXCEPTIONAL_SHIFT)
#define RADIX_DAX_PMD (1 << (RADIX_TREE_EXCEPTIONAL_SHIFT + 1))
#define RADIX_DAX_HZP (1 << (RADIX_TREE_EXCEPTIONAL_SHIFT + 2))
#define RADIX_DAX_EMPTY (1 << (RADIX_TREE_EXCEPTIONAL_SHIFT + 3))
static inline unsigned long dax_radix_sector(void *entry)
{
return (unsigned long)entry >> RADIX_DAX_SHIFT;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Ross Zwisler | 21 | 100.00% | 2 | 100.00% |
| Total | 21 | 100.00% | 2 | 100.00% |
static inline void *dax_radix_locked_entry(sector_t sector, unsigned long flags)
{
return (void *)(RADIX_TREE_EXCEPTIONAL_ENTRY | flags |
((unsigned long)sector << RADIX_DAX_SHIFT) |
RADIX_DAX_ENTRY_LOCK);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Ross Zwisler | 38 | 100.00% | 2 | 100.00% |
| Total | 38 | 100.00% | 2 | 100.00% |
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,
const struct iomap_ops *ops);
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);
void dax_wake_mapping_entry_waiter(struct address_space *mapping,
pgoff_t index, void *entry, bool wake_all);
#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
#ifdef CONFIG_FS_DAX_PMD
static inline unsigned int dax_radix_order(void *entry)
{
if ((unsigned long)entry & RADIX_DAX_PMD)
return PMD_SHIFT - PAGE_SHIFT;
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Ross Zwisler | 30 | 100.00% | 1 | 100.00% |
| Total | 30 | 100.00% | 1 | 100.00% |
#else
static inline unsigned int dax_radix_order(void *entry)
{
return 0;
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Ross Zwisler | 15 | 100.00% | 1 | 100.00% |
| Total | 15 | 100.00% | 1 | 100.00% |
#endif
int dax_pfn_mkwrite(struct vm_fault *vmf);
static inline bool vma_is_dax(struct vm_area_struct *vma)
{
return vma->vm_file && IS_DAX(vma->vm_file->f_mapping->host);
}
Contributors
| Person | Tokens | Prop | Commits | CommitProp |
| Matthew Wilcox | 28 | 100.00% | 1 | 100.00% |
| Total | 28 | 100.00% | 1 | 100.00% |
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 | 335 | 47.59% | 8 | 28.57% |
| Ross Zwisler | 180 | 25.57% | 7 | 25.00% |
| Christoph Hellwig | 82 | 11.65% | 4 | 14.29% |
| Matthew Wilcox | 57 | 8.10% | 3 | 10.71% |
| Jan Kara | 45 | 6.39% | 4 | 14.29% |
| Dave Jiang | 5 | 0.71% | 2 | 7.14% |
| Total | 704 | 100.00% | 28 | 100.00% |
Information contained on this website is for historical information purposes only and does not indicate or represent copyright ownership.