6b524995a7
Remove the unused wrappers dax_fault() and dax_pmd_fault(). After this removal, rename __dax_fault() and __dax_pmd_fault() to dax_fault() and dax_pmd_fault() respectively, and update all callers. The dax_fault() and dax_pmd_fault() wrappers were initially intended to capture some filesystem independent functionality around page faults (calling sb_start_pagefault() & sb_end_pagefault(), updating file mtime and ctime). However, the following commits:5726b27b09("ext2: Add locking for DAX faults")ea3d7209ca("ext4: fix races between page faults and hole punching") added locking to the ext2 and ext4 filesystems after these common operations but before __dax_fault() and __dax_pmd_fault() were called. This means that these wrappers are no longer used, and are unlikely to be used in the future. XFS has had locking analogous to what was recently added to ext2 and ext4 since DAX support was initially introduced by:6b698edeee("xfs: add DAX file operations support") Link: http://lkml.kernel.org/r/20160714214049.20075-2-ross.zwisler@linux.intel.com Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com> Cc: "Theodore Ts'o" <tytso@mit.edu> Cc: Alexander Viro <viro@zeniv.linux.org.uk> Cc: Andreas Dilger <adilger.kernel@dilger.ca> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Dave Chinner <david@fromorbit.com> Reviewed-by: Jan Kara <jack@suse.cz> Cc: Jonathan Corbet <corbet@lwn.net> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
72 lines
2.3 KiB
C
72 lines
2.3 KiB
C
#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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#include <asm/pgtable.h>
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/* We use lowest available exceptional entry bit for locking */
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#define RADIX_DAX_ENTRY_LOCK (1 << RADIX_TREE_EXCEPTIONAL_SHIFT)
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ssize_t dax_do_io(struct kiocb *, struct inode *, struct iov_iter *,
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get_block_t, dio_iodone_t, int flags);
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int dax_zero_page_range(struct inode *, loff_t from, unsigned len, get_block_t);
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int dax_truncate_page(struct inode *, loff_t from, get_block_t);
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int dax_fault(struct vm_area_struct *, struct vm_fault *, get_block_t);
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int dax_delete_mapping_entry(struct address_space *mapping, pgoff_t index);
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void dax_wake_mapping_entry_waiter(struct address_space *mapping,
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pgoff_t index, bool wake_all);
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#ifdef CONFIG_FS_DAX
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struct page *read_dax_sector(struct block_device *bdev, sector_t n);
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void dax_unlock_mapping_entry(struct address_space *mapping, pgoff_t index);
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int __dax_zero_page_range(struct block_device *bdev, sector_t sector,
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unsigned int offset, unsigned int length);
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#else
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static inline struct page *read_dax_sector(struct block_device *bdev,
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sector_t n)
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{
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return ERR_PTR(-ENXIO);
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}
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/* Shouldn't ever be called when dax is disabled. */
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static inline void dax_unlock_mapping_entry(struct address_space *mapping,
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pgoff_t index)
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{
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BUG();
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}
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static inline int __dax_zero_page_range(struct block_device *bdev,
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sector_t sector, unsigned int offset, unsigned int length)
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{
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return -ENXIO;
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}
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#endif
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#if defined(CONFIG_TRANSPARENT_HUGEPAGE)
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int dax_pmd_fault(struct vm_area_struct *, unsigned long addr, pmd_t *,
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unsigned int flags, get_block_t);
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#else
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static inline int dax_pmd_fault(struct vm_area_struct *vma, unsigned long addr,
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pmd_t *pmd, unsigned int flags, get_block_t gb)
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{
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return VM_FAULT_FALLBACK;
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}
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#endif
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int dax_pfn_mkwrite(struct vm_area_struct *, struct vm_fault *);
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#define dax_mkwrite(vma, vmf, gb) dax_fault(vma, vmf, gb)
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static inline bool vma_is_dax(struct vm_area_struct *vma)
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{
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return vma->vm_file && IS_DAX(vma->vm_file->f_mapping->host);
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}
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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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struct writeback_control;
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int dax_writeback_mapping_range(struct address_space *mapping,
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struct block_device *bdev, struct writeback_control *wbc);
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#endif
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