d1a5f2b4d8
Avoid populating pagecache when the block device is in DAX mode. Otherwise these page cache entries collide with the fsync/msync implementation and break data durability guarantees. Cc: Jan Kara <jack@suse.com> Cc: Jeff Moyer <jmoyer@redhat.com> Cc: Christoph Hellwig <hch@lst.de> Cc: Dave Chinner <david@fromorbit.com> Cc: Andrew Morton <akpm@linux-foundation.org> Reported-by: Ross Zwisler <ross.zwisler@linux.intel.com> Tested-by: Ross Zwisler <ross.zwisler@linux.intel.com> Reviewed-by: Matthew Wilcox <willy@linux.intel.com> Signed-off-by: Dan Williams <dan.j.williams@intel.com>
58 lines
1.9 KiB
C
58 lines
1.9 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 <asm/pgtable.h>
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ssize_t dax_do_io(struct kiocb *, struct inode *, struct iov_iter *, loff_t,
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get_block_t, dio_iodone_t, int flags);
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int dax_clear_blocks(struct inode *, sector_t block, long size);
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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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dax_iodone_t);
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int __dax_fault(struct vm_area_struct *, struct vm_fault *, get_block_t,
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dax_iodone_t);
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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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#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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#endif
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#ifdef 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, dax_iodone_t);
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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, dax_iodone_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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dax_iodone_t di)
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{
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return VM_FAULT_FALLBACK;
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}
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#define __dax_pmd_fault dax_pmd_fault
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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, iod) dax_fault(vma, vmf, gb, iod)
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#define __dax_mkwrite(vma, vmf, gb, iod) __dax_fault(vma, vmf, gb, iod)
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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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int dax_writeback_mapping_range(struct address_space *mapping, loff_t start,
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loff_t end);
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#endif
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