forked from luck/tmp_suning_uos_patched
7f6d5b529b
Previously calls to dax_writeback_mapping_range() for all DAX filesystems (ext2, ext4 & xfs) were centralized in filemap_write_and_wait_range(). dax_writeback_mapping_range() needs a struct block_device, and it used to get that from inode->i_sb->s_bdev. This is correct for normal inodes mounted on ext2, ext4 and XFS filesystems, but is incorrect for DAX raw block devices and for XFS real-time files. Instead, call dax_writeback_mapping_range() directly from the filesystem ->writepages function so that it can supply us with a valid block device. This also fixes DAX code to properly flush caches in response to sync(2). Signed-off-by: Ross Zwisler <ross.zwisler@linux.intel.com> Signed-off-by: Jan Kara <jack@suse.cz> Cc: Al Viro <viro@ftp.linux.org.uk> Cc: Dan Williams <dan.j.williams@intel.com> Cc: Dave Chinner <david@fromorbit.com> Cc: Jens Axboe <axboe@fb.com> Cc: Matthew Wilcox <matthew.r.wilcox@intel.com> Cc: Theodore Ts'o <tytso@mit.edu> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
60 lines
1.9 KiB
C
60 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_sectors(struct block_device *bdev, sector_t _sector, 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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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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