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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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>
Jan Kara48bde862009-12-15 16:46:49 -080022#include <linux/pagemap.h>
Christoph Hellwig871a2932010-03-03 09:05:07 -050023#include <linux/quotaops.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070024#include "ext2.h"
25#include "xattr.h"
26#include "acl.h"
27
Matthew Wilcox6cd176a2015-02-16 15:59:25 -080028#ifdef CONFIG_FS_DAX
Matthew Wilcoxf7ca90b2015-02-16 15:59:02 -080029static int ext2_dax_fault(struct vm_area_struct *vma, struct vm_fault *vmf)
30{
31 return dax_fault(vma, vmf, ext2_get_block);
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);
37}
38
39static const struct vm_operations_struct ext2_dax_vm_ops = {
40 .fault = ext2_dax_fault,
41 .page_mkwrite = ext2_dax_mkwrite,
42};
43
44static int ext2_file_mmap(struct file *file, struct vm_area_struct *vma)
45{
46 if (!IS_DAX(file_inode(file)))
47 return generic_file_mmap(file, vma);
48
49 file_accessed(file);
50 vma->vm_ops = &ext2_dax_vm_ops;
51 vma->vm_flags |= VM_MIXEDMAP;
52 return 0;
53}
54#else
55#define ext2_file_mmap generic_file_mmap
56#endif
57
Linus Torvalds1da177e2005-04-16 15:20:36 -070058/*
Jan Karaa6739af2007-07-15 23:40:22 -070059 * Called when filp is released. This happens when all file descriptors
60 * for a single struct file are closed. Note that different open() calls
61 * for the same file yield different struct file structures.
Linus Torvalds1da177e2005-04-16 15:20:36 -070062 */
63static int ext2_release_file (struct inode * inode, struct file * filp)
64{
Martin J. Bligha686cd82007-10-16 23:30:46 -070065 if (filp->f_mode & FMODE_WRITE) {
66 mutex_lock(&EXT2_I(inode)->truncate_mutex);
67 ext2_discard_reservation(inode);
68 mutex_unlock(&EXT2_I(inode)->truncate_mutex);
69 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070070 return 0;
71}
72
Josef Bacik02c24a82011-07-16 20:44:56 -040073int ext2_fsync(struct file *file, loff_t start, loff_t end, int datasync)
Jan Kara48bde862009-12-15 16:46:49 -080074{
75 int ret;
Christoph Hellwig7ea80852010-05-26 17:53:25 +020076 struct super_block *sb = file->f_mapping->host->i_sb;
Jan Kara48bde862009-12-15 16:46:49 -080077 struct address_space *mapping = sb->s_bdev->bd_inode->i_mapping;
78
Josef Bacik02c24a82011-07-16 20:44:56 -040079 ret = generic_file_fsync(file, start, end, datasync);
Jan Kara48bde862009-12-15 16:46:49 -080080 if (ret == -EIO || test_and_clear_bit(AS_EIO, &mapping->flags)) {
81 /* We don't really know where the IO error happened... */
82 ext2_error(sb, __func__,
83 "detected IO error when writing metadata buffers");
84 ret = -EIO;
85 }
86 return ret;
87}
88
Linus Torvalds1da177e2005-04-16 15:20:36 -070089/*
90 * We have mostly NULL's here: the current defaults are ok for
91 * the ext2 filesystem.
92 */
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -080093const struct file_operations ext2_file_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070094 .llseek = generic_file_llseek,
Al Viroaad4f8b2014-04-02 14:33:16 -040095 .read = new_sync_read,
Al Viro81742022014-04-03 03:17:43 -040096 .write = new_sync_write,
Al Viroaad4f8b2014-04-02 14:33:16 -040097 .read_iter = generic_file_read_iter,
Al Viro81742022014-04-03 03:17:43 -040098 .write_iter = generic_file_write_iter,
Andi Kleen14f9f7b2008-02-06 01:40:10 -080099 .unlocked_ioctl = ext2_ioctl,
David Howellse322ff02006-08-29 19:06:20 +0100100#ifdef CONFIG_COMPAT
101 .compat_ioctl = ext2_compat_ioctl,
102#endif
Matthew Wilcoxf7ca90b2015-02-16 15:59:02 -0800103 .mmap = ext2_file_mmap,
Christoph Hellwig907f4552010-03-03 09:05:06 -0500104 .open = dquot_file_open,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700105 .release = ext2_release_file,
Jan Kara48bde862009-12-15 16:46:49 -0800106 .fsync = ext2_fsync,
Jens Axboe5274f052006-03-30 15:15:30 +0200107 .splice_read = generic_file_splice_read,
Al Viro8d020762014-04-05 04:27:08 -0400108 .splice_write = iter_file_splice_write,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700109};
110
Matthew Wilcox6cd176a2015-02-16 15:59:25 -0800111#ifdef CONFIG_FS_DAX
Matthew Wilcox9c3ce9e2015-02-16 15:59:31 -0800112const struct file_operations ext2_dax_file_operations = {
Carsten Otte6d791252005-06-23 22:05:26 -0700113 .llseek = generic_file_llseek,
Matthew Wilcoxd475c632015-02-16 15:58:56 -0800114 .read = new_sync_read,
115 .write = new_sync_write,
116 .read_iter = generic_file_read_iter,
117 .write_iter = generic_file_write_iter,
Andi Kleen14f9f7b2008-02-06 01:40:10 -0800118 .unlocked_ioctl = ext2_ioctl,
David Howellse322ff02006-08-29 19:06:20 +0100119#ifdef CONFIG_COMPAT
120 .compat_ioctl = ext2_compat_ioctl,
121#endif
Matthew Wilcoxf7ca90b2015-02-16 15:59:02 -0800122 .mmap = ext2_file_mmap,
Christoph Hellwig907f4552010-03-03 09:05:06 -0500123 .open = dquot_file_open,
Carsten Otte6d791252005-06-23 22:05:26 -0700124 .release = ext2_release_file,
Jan Kara48bde862009-12-15 16:46:49 -0800125 .fsync = ext2_fsync,
Carsten Otte6d791252005-06-23 22:05:26 -0700126};
127#endif
128
Arjan van de Ven754661f2007-02-12 00:55:38 -0800129const struct inode_operations ext2_file_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700130#ifdef CONFIG_EXT2_FS_XATTR
131 .setxattr = generic_setxattr,
132 .getxattr = generic_getxattr,
133 .listxattr = ext2_listxattr,
134 .removexattr = generic_removexattr,
135#endif
136 .setattr = ext2_setattr,
Christoph Hellwig4e34e712011-07-23 17:37:31 +0200137 .get_acl = ext2_get_acl,
Christoph Hellwig64e178a2013-12-20 05:16:44 -0800138 .set_acl = ext2_set_acl,
Josef Bacik68c9d702008-10-03 17:32:43 -0400139 .fiemap = ext2_fiemap,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140};