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c94c2acf84
In order to handle the !CONFIG_TRANSPARENT_HUGEPAGES case, we need to return VM_FAULT_FALLBACK from the inlined dax_pmd_fault(), which is defined in linux/mm.h. Given that we don't want to include <linux/mm.h> in <linux/fs.h>, the easiest solution is to move the DAX-related functions to a new header, <linux/dax.h>. We could also have moved VM_FAULT_* definitions to a new header, or a different header that isn't quite such a boil-the-ocean header as <linux/mm.h>, but this felt like the best option. Signed-off-by: Matthew Wilcox <willy@linux.intel.com> Cc: Hillf Danton <dhillf@gmail.com> Cc: "Kirill A. Shutemov" <kirill.shutemov@linux.intel.com> Cc: Theodore Ts'o <tytso@mit.edu> Cc: Jan Kara <jack@suse.cz> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
123 lines
3.1 KiB
C
123 lines
3.1 KiB
C
/*
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* linux/fs/ext2/file.c
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*
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* Copyright (C) 1992, 1993, 1994, 1995
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* Remy Card (card@masi.ibp.fr)
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* Laboratoire MASI - Institut Blaise Pascal
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* Universite Pierre et Marie Curie (Paris VI)
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*
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* from
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*
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* linux/fs/minix/file.c
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*
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* Copyright (C) 1991, 1992 Linus Torvalds
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*
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* ext2 fs regular file handling primitives
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*
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* 64-bit file support on 64-bit platforms by Jakub Jelinek
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* (jj@sunsite.ms.mff.cuni.cz)
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*/
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#include <linux/time.h>
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#include <linux/pagemap.h>
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#include <linux/dax.h>
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#include <linux/quotaops.h>
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#include "ext2.h"
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#include "xattr.h"
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#include "acl.h"
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#ifdef CONFIG_FS_DAX
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static int ext2_dax_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
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{
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return dax_fault(vma, vmf, ext2_get_block, NULL);
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}
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static int ext2_dax_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
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{
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return dax_mkwrite(vma, vmf, ext2_get_block, NULL);
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}
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static const struct vm_operations_struct ext2_dax_vm_ops = {
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.fault = ext2_dax_fault,
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.page_mkwrite = ext2_dax_mkwrite,
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.pfn_mkwrite = dax_pfn_mkwrite,
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};
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static int ext2_file_mmap(struct file *file, struct vm_area_struct *vma)
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{
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if (!IS_DAX(file_inode(file)))
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return generic_file_mmap(file, vma);
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file_accessed(file);
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vma->vm_ops = &ext2_dax_vm_ops;
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vma->vm_flags |= VM_MIXEDMAP;
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return 0;
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}
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#else
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#define ext2_file_mmap generic_file_mmap
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#endif
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/*
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* Called when filp is released. This happens when all file descriptors
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* for a single struct file are closed. Note that different open() calls
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* for the same file yield different struct file structures.
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*/
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static int ext2_release_file (struct inode * inode, struct file * filp)
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{
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if (filp->f_mode & FMODE_WRITE) {
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mutex_lock(&EXT2_I(inode)->truncate_mutex);
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ext2_discard_reservation(inode);
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mutex_unlock(&EXT2_I(inode)->truncate_mutex);
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}
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return 0;
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}
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int ext2_fsync(struct file *file, loff_t start, loff_t end, int datasync)
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{
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int ret;
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struct super_block *sb = file->f_mapping->host->i_sb;
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struct address_space *mapping = sb->s_bdev->bd_inode->i_mapping;
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ret = generic_file_fsync(file, start, end, datasync);
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if (ret == -EIO || test_and_clear_bit(AS_EIO, &mapping->flags)) {
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/* We don't really know where the IO error happened... */
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ext2_error(sb, __func__,
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"detected IO error when writing metadata buffers");
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ret = -EIO;
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}
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return ret;
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}
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/*
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* We have mostly NULL's here: the current defaults are ok for
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* the ext2 filesystem.
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*/
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const struct file_operations ext2_file_operations = {
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.llseek = generic_file_llseek,
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.read_iter = generic_file_read_iter,
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.write_iter = generic_file_write_iter,
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.unlocked_ioctl = ext2_ioctl,
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#ifdef CONFIG_COMPAT
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.compat_ioctl = ext2_compat_ioctl,
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#endif
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.mmap = ext2_file_mmap,
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.open = dquot_file_open,
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.release = ext2_release_file,
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.fsync = ext2_fsync,
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.splice_read = generic_file_splice_read,
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.splice_write = iter_file_splice_write,
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};
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const struct inode_operations ext2_file_inode_operations = {
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#ifdef CONFIG_EXT2_FS_XATTR
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.setxattr = generic_setxattr,
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.getxattr = generic_getxattr,
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.listxattr = ext2_listxattr,
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.removexattr = generic_removexattr,
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#endif
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.setattr = ext2_setattr,
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.get_acl = ext2_get_acl,
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.set_acl = ext2_set_acl,
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.fiemap = ext2_fiemap,
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};
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