blob: 3a0a6c6406d000560c5c5971c733751e091c3382 [file] [log] [blame]
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,
Boaz Harrosh0e3b2102015-04-15 16:15:14 -070042 .pfn_mkwrite = dax_pfn_mkwrite,
Matthew Wilcoxf7ca90b2015-02-16 15:59:02 -080043};
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
Linus Torvalds1da177e2005-04-16 15:20:36 -070059/*
Jan Karaa6739af2007-07-15 23:40:22 -070060 * 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.
Linus Torvalds1da177e2005-04-16 15:20:36 -070063 */
64static int ext2_release_file (struct inode * inode, struct file * filp)
65{
Martin J. Bligha686cd82007-10-16 23:30:46 -070066 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 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 return 0;
72}
73
Josef Bacik02c24a82011-07-16 20:44:56 -040074int ext2_fsync(struct file *file, loff_t start, loff_t end, int datasync)
Jan Kara48bde862009-12-15 16:46:49 -080075{
76 int ret;
Christoph Hellwig7ea80852010-05-26 17:53:25 +020077 struct super_block *sb = file->f_mapping->host->i_sb;
Jan Kara48bde862009-12-15 16:46:49 -080078 struct address_space *mapping = sb->s_bdev->bd_inode->i_mapping;
79
Josef Bacik02c24a82011-07-16 20:44:56 -040080 ret = generic_file_fsync(file, start, end, datasync);
Jan Kara48bde862009-12-15 16:46:49 -080081 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
Linus Torvalds1da177e2005-04-16 15:20:36 -070090/*
91 * We have mostly NULL's here: the current defaults are ok for
92 * the ext2 filesystem.
93 */
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -080094const struct file_operations ext2_file_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 .llseek = generic_file_llseek,
Al Viroaad4f8b2014-04-02 14:33:16 -040096 .read_iter = generic_file_read_iter,
Al Viro81742022014-04-03 03:17:43 -040097 .write_iter = generic_file_write_iter,
Andi Kleen14f9f7b2008-02-06 01:40:10 -080098 .unlocked_ioctl = ext2_ioctl,
David Howellse322ff02006-08-29 19:06:20 +010099#ifdef CONFIG_COMPAT
100 .compat_ioctl = ext2_compat_ioctl,
101#endif
Matthew Wilcoxf7ca90b2015-02-16 15:59:02 -0800102 .mmap = ext2_file_mmap,
Christoph Hellwig907f4552010-03-03 09:05:06 -0500103 .open = dquot_file_open,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700104 .release = ext2_release_file,
Jan Kara48bde862009-12-15 16:46:49 -0800105 .fsync = ext2_fsync,
Jens Axboe5274f052006-03-30 15:15:30 +0200106 .splice_read = generic_file_splice_read,
Al Viro8d020762014-04-05 04:27:08 -0400107 .splice_write = iter_file_splice_write,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700108};
109
Arjan van de Ven754661f2007-02-12 00:55:38 -0800110const struct inode_operations ext2_file_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111#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,
Christoph Hellwig4e34e712011-07-23 17:37:31 +0200118 .get_acl = ext2_get_acl,
Christoph Hellwig64e178a2013-12-20 05:16:44 -0800119 .set_acl = ext2_set_acl,
Josef Bacik68c9d702008-10-03 17:32:43 -0400120 .fiemap = ext2_fiemap,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121};