1/*
2 *  linux/fs/ext2/file.c
3 *
4 * Copyright (C) 1992, 1993, 1994, 1995
5 * Remy Card (card@masi.ibp.fr)
6 * Laboratoire MASI - Institut Blaise Pascal
7 * Universite Pierre et Marie Curie (Paris VI)
8 *
9 *  from
10 *
11 *  linux/fs/minix/file.c
12 *
13 *  Copyright (C) 1991, 1992  Linus Torvalds
14 *
15 *  ext2 fs regular file handling primitives
16 *
17 *  64-bit file support on 64-bit platforms by Jakub Jelinek
18 * 	(jj@sunsite.ms.mff.cuni.cz)
19 */
20
21#include <linux/time.h>
22#include <linux/pagemap.h>
23#include <linux/quotaops.h>
24#include "ext2.h"
25#include "xattr.h"
26#include "acl.h"
27
28#ifdef CONFIG_FS_DAX
29static int ext2_dax_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
30{
31	return dax_fault(vma, vmf, ext2_get_block, NULL);
32}
33
34static int ext2_dax_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
35{
36	return dax_mkwrite(vma, vmf, ext2_get_block, NULL);
37}
38
39static const struct vm_operations_struct ext2_dax_vm_ops = {
40	.fault		= ext2_dax_fault,
41	.page_mkwrite	= ext2_dax_mkwrite,
42	.pfn_mkwrite	= dax_pfn_mkwrite,
43};
44
45static int ext2_file_mmap(struct file *file, struct vm_area_struct *vma)
46{
47	if (!IS_DAX(file_inode(file)))
48		return generic_file_mmap(file, vma);
49
50	file_accessed(file);
51	vma->vm_ops = &ext2_dax_vm_ops;
52	vma->vm_flags |= VM_MIXEDMAP;
53	return 0;
54}
55#else
56#define ext2_file_mmap	generic_file_mmap
57#endif
58
59/*
60 * Called when filp is released. This happens when all file descriptors
61 * for a single struct file are closed. Note that different open() calls
62 * for the same file yield different struct file structures.
63 */
64static int ext2_release_file (struct inode * inode, struct file * filp)
65{
66	if (filp->f_mode & FMODE_WRITE) {
67		mutex_lock(&EXT2_I(inode)->truncate_mutex);
68		ext2_discard_reservation(inode);
69		mutex_unlock(&EXT2_I(inode)->truncate_mutex);
70	}
71	return 0;
72}
73
74int ext2_fsync(struct file *file, loff_t start, loff_t end, int datasync)
75{
76	int ret;
77	struct super_block *sb = file->f_mapping->host->i_sb;
78	struct address_space *mapping = sb->s_bdev->bd_inode->i_mapping;
79
80	ret = generic_file_fsync(file, start, end, datasync);
81	if (ret == -EIO || test_and_clear_bit(AS_EIO, &mapping->flags)) {
82		/* We don't really know where the IO error happened... */
83		ext2_error(sb, __func__,
84			   "detected IO error when writing metadata buffers");
85		ret = -EIO;
86	}
87	return ret;
88}
89
90/*
91 * We have mostly NULL's here: the current defaults are ok for
92 * the ext2 filesystem.
93 */
94const struct file_operations ext2_file_operations = {
95	.llseek		= generic_file_llseek,
96	.read_iter	= generic_file_read_iter,
97	.write_iter	= generic_file_write_iter,
98	.unlocked_ioctl = ext2_ioctl,
99#ifdef CONFIG_COMPAT
100	.compat_ioctl	= ext2_compat_ioctl,
101#endif
102	.mmap		= ext2_file_mmap,
103	.open		= dquot_file_open,
104	.release	= ext2_release_file,
105	.fsync		= ext2_fsync,
106	.splice_read	= generic_file_splice_read,
107	.splice_write	= iter_file_splice_write,
108};
109
110const struct inode_operations ext2_file_inode_operations = {
111#ifdef CONFIG_EXT2_FS_XATTR
112	.setxattr	= generic_setxattr,
113	.getxattr	= generic_getxattr,
114	.listxattr	= ext2_listxattr,
115	.removexattr	= generic_removexattr,
116#endif
117	.setattr	= ext2_setattr,
118	.get_acl	= ext2_get_acl,
119	.set_acl	= ext2_set_acl,
120	.fiemap		= ext2_fiemap,
121};
122