blob: 034fbda39ec9cac257f8d5b424035f90851478fe [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{
Dave Chinner034ad5c2015-06-04 09:18:18 +100031 return dax_fault(vma, vmf, ext2_get_block, NULL);
Matthew Wilcoxf7ca90b2015-02-16 15:59:02 -080032}
33
Matthew Wilcox996c6692015-09-08 14:59:00 -070034static int ext2_dax_pmd_fault(struct vm_area_struct *vma, unsigned long addr,
35 pmd_t *pmd, unsigned int flags)
36{
37 return dax_pmd_fault(vma, addr, pmd, flags, ext2_get_block, NULL);
38}
39
Matthew Wilcoxf7ca90b2015-02-16 15:59:02 -080040static int ext2_dax_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
41{
Dave Chinner034ad5c2015-06-04 09:18:18 +100042 return dax_mkwrite(vma, vmf, ext2_get_block, NULL);
Matthew Wilcoxf7ca90b2015-02-16 15:59:02 -080043}
44
45static const struct vm_operations_struct ext2_dax_vm_ops = {
46 .fault = ext2_dax_fault,
Matthew Wilcox996c6692015-09-08 14:59:00 -070047 .pmd_fault = ext2_dax_pmd_fault,
Matthew Wilcoxf7ca90b2015-02-16 15:59:02 -080048 .page_mkwrite = ext2_dax_mkwrite,
Boaz Harrosh0e3b2102015-04-15 16:15:14 -070049 .pfn_mkwrite = dax_pfn_mkwrite,
Matthew Wilcoxf7ca90b2015-02-16 15:59:02 -080050};
51
52static int ext2_file_mmap(struct file *file, struct vm_area_struct *vma)
53{
54 if (!IS_DAX(file_inode(file)))
55 return generic_file_mmap(file, vma);
56
57 file_accessed(file);
58 vma->vm_ops = &ext2_dax_vm_ops;
Matthew Wilcox996c6692015-09-08 14:59:00 -070059 vma->vm_flags |= VM_MIXEDMAP | VM_HUGEPAGE;
Matthew Wilcoxf7ca90b2015-02-16 15:59:02 -080060 return 0;
61}
62#else
63#define ext2_file_mmap generic_file_mmap
64#endif
65
Linus Torvalds1da177e2005-04-16 15:20:36 -070066/*
Jan Karaa6739af2007-07-15 23:40:22 -070067 * Called when filp is released. This happens when all file descriptors
68 * for a single struct file are closed. Note that different open() calls
69 * for the same file yield different struct file structures.
Linus Torvalds1da177e2005-04-16 15:20:36 -070070 */
71static int ext2_release_file (struct inode * inode, struct file * filp)
72{
Martin J. Bligha686cd82007-10-16 23:30:46 -070073 if (filp->f_mode & FMODE_WRITE) {
74 mutex_lock(&EXT2_I(inode)->truncate_mutex);
75 ext2_discard_reservation(inode);
76 mutex_unlock(&EXT2_I(inode)->truncate_mutex);
77 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070078 return 0;
79}
80
Josef Bacik02c24a82011-07-16 20:44:56 -040081int ext2_fsync(struct file *file, loff_t start, loff_t end, int datasync)
Jan Kara48bde862009-12-15 16:46:49 -080082{
83 int ret;
Christoph Hellwig7ea80852010-05-26 17:53:25 +020084 struct super_block *sb = file->f_mapping->host->i_sb;
Jan Kara48bde862009-12-15 16:46:49 -080085 struct address_space *mapping = sb->s_bdev->bd_inode->i_mapping;
86
Josef Bacik02c24a82011-07-16 20:44:56 -040087 ret = generic_file_fsync(file, start, end, datasync);
Jan Kara48bde862009-12-15 16:46:49 -080088 if (ret == -EIO || test_and_clear_bit(AS_EIO, &mapping->flags)) {
89 /* We don't really know where the IO error happened... */
90 ext2_error(sb, __func__,
91 "detected IO error when writing metadata buffers");
92 ret = -EIO;
93 }
94 return ret;
95}
96
Linus Torvalds1da177e2005-04-16 15:20:36 -070097/*
98 * We have mostly NULL's here: the current defaults are ok for
99 * the ext2 filesystem.
100 */
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800101const struct file_operations ext2_file_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700102 .llseek = generic_file_llseek,
Al Viroaad4f8b2014-04-02 14:33:16 -0400103 .read_iter = generic_file_read_iter,
Al Viro81742022014-04-03 03:17:43 -0400104 .write_iter = generic_file_write_iter,
Andi Kleen14f9f7b2008-02-06 01:40:10 -0800105 .unlocked_ioctl = ext2_ioctl,
David Howellse322ff02006-08-29 19:06:20 +0100106#ifdef CONFIG_COMPAT
107 .compat_ioctl = ext2_compat_ioctl,
108#endif
Matthew Wilcoxf7ca90b2015-02-16 15:59:02 -0800109 .mmap = ext2_file_mmap,
Christoph Hellwig907f4552010-03-03 09:05:06 -0500110 .open = dquot_file_open,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700111 .release = ext2_release_file,
Jan Kara48bde862009-12-15 16:46:49 -0800112 .fsync = ext2_fsync,
Jens Axboe5274f052006-03-30 15:15:30 +0200113 .splice_read = generic_file_splice_read,
Al Viro8d020762014-04-05 04:27:08 -0400114 .splice_write = iter_file_splice_write,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115};
116
Arjan van de Ven754661f2007-02-12 00:55:38 -0800117const struct inode_operations ext2_file_inode_operations = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118#ifdef CONFIG_EXT2_FS_XATTR
119 .setxattr = generic_setxattr,
120 .getxattr = generic_getxattr,
121 .listxattr = ext2_listxattr,
122 .removexattr = generic_removexattr,
123#endif
124 .setattr = ext2_setattr,
Christoph Hellwig4e34e712011-07-23 17:37:31 +0200125 .get_acl = ext2_get_acl,
Christoph Hellwig64e178a2013-12-20 05:16:44 -0800126 .set_acl = ext2_set_acl,
Josef Bacik68c9d702008-10-03 17:32:43 -0400127 .fiemap = ext2_fiemap,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128};