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https://github.com/torvalds/linux
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e842f29039
dax_fault() currently relies on the get_block callback to attach an io completion callback to the mapping buffer head so that it can run unwritten extent conversion after zeroing allocated blocks. Instead of this hack, pass the conversion callback directly into dax_fault() similar to the get_block callback. When the filesystem allocates unwritten extents, it will set the buffer_unwritten() flag, and hence the dax_fault code can call the completion function in the contexts where it is necessary without overloading the mapping buffer head. Note: The changes to ext4 to use this interface are suspect at best. In fact, the way ext4 did this end_io assignment in the first place looks suspect because it only set a completion callback when there wasn't already some other write() call taking place on the same inode. The ext4 end_io code looks rather intricate and fragile with all it's reference counting and passing to different contexts for modification via inode private pointers that aren't protected by locks... Signed-off-by: Dave Chinner <dchinner@redhat.com> Acked-by: Jan Kara <jack@suse.cz> Signed-off-by: Dave Chinner <david@fromorbit.com>
122 lines
3.1 KiB
C
122 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/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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