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1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/fs/ext2/file.c
4 *
5 * Copyright (C) 1992, 1993, 1994, 1995
6 * Remy Card (card@masi.ibp.fr)
7 * Laboratoire MASI - Institut Blaise Pascal
8 * Universite Pierre et Marie Curie (Paris VI)
9 *
10 * from
11 *
12 * linux/fs/minix/file.c
13 *
14 * Copyright (C) 1991, 1992 Linus Torvalds
15 *
16 * ext2 fs regular file handling primitives
17 *
18 * 64-bit file support on 64-bit platforms by Jakub Jelinek
19 * (jj@sunsite.ms.mff.cuni.cz)
20 */
21
22#include <linux/time.h>
23#include <linux/pagemap.h>
24#include <linux/dax.h>
25#include <linux/quotaops.h>
26#include <linux/iomap.h>
27#include <linux/uio.h>
28#include "ext2.h"
29#include "xattr.h"
30#include "acl.h"
31
32#ifdef CONFIG_FS_DAX
33static ssize_t ext2_dax_read_iter(struct kiocb *iocb, struct iov_iter *to)
34{
35 struct inode *inode = iocb->ki_filp->f_mapping->host;
36 ssize_t ret;
37
38 if (!iov_iter_count(to))
39 return 0; /* skip atime */
40
41 inode_lock_shared(inode);
42 ret = dax_iomap_rw(iocb, to, &ext2_iomap_ops);
43 inode_unlock_shared(inode);
44
45 file_accessed(iocb->ki_filp);
46 return ret;
47}
48
49static ssize_t ext2_dax_write_iter(struct kiocb *iocb, struct iov_iter *from)
50{
51 struct file *file = iocb->ki_filp;
52 struct inode *inode = file->f_mapping->host;
53 ssize_t ret;
54
55 inode_lock(inode);
56 ret = generic_write_checks(iocb, from);
57 if (ret <= 0)
58 goto out_unlock;
59 ret = file_remove_privs(file);
60 if (ret)
61 goto out_unlock;
62 ret = file_update_time(file);
63 if (ret)
64 goto out_unlock;
65
66 ret = dax_iomap_rw(iocb, from, &ext2_iomap_ops);
67 if (ret > 0 && iocb->ki_pos > i_size_read(inode)) {
68 i_size_write(inode, iocb->ki_pos);
69 mark_inode_dirty(inode);
70 }
71
72out_unlock:
73 inode_unlock(inode);
74 if (ret > 0)
75 ret = generic_write_sync(iocb, ret);
76 return ret;
77}
78
79/*
80 * The lock ordering for ext2 DAX fault paths is:
81 *
82 * mmap_lock (MM)
83 * sb_start_pagefault (vfs, freeze)
84 * address_space->invalidate_lock
85 * address_space->i_mmap_rwsem or page_lock (mutually exclusive in DAX)
86 * ext2_inode_info->truncate_mutex
87 *
88 * The default page_lock and i_size verification done by non-DAX fault paths
89 * is sufficient because ext2 doesn't support hole punching.
90 */
91static vm_fault_t ext2_dax_fault(struct vm_fault *vmf)
92{
93 struct inode *inode = file_inode(vmf->vma->vm_file);
94 vm_fault_t ret;
95 bool write = (vmf->flags & FAULT_FLAG_WRITE) &&
96 (vmf->vma->vm_flags & VM_SHARED);
97
98 if (write) {
99 sb_start_pagefault(inode->i_sb);
100 file_update_time(vmf->vma->vm_file);
101 }
102 filemap_invalidate_lock_shared(inode->i_mapping);
103
104 ret = dax_iomap_fault(vmf, PE_SIZE_PTE, NULL, NULL, &ext2_iomap_ops);
105
106 filemap_invalidate_unlock_shared(inode->i_mapping);
107 if (write)
108 sb_end_pagefault(inode->i_sb);
109 return ret;
110}
111
112static const struct vm_operations_struct ext2_dax_vm_ops = {
113 .fault = ext2_dax_fault,
114 /*
115 * .huge_fault is not supported for DAX because allocation in ext2
116 * cannot be reliably aligned to huge page sizes and so pmd faults
117 * will always fail and fail back to regular faults.
118 */
119 .page_mkwrite = ext2_dax_fault,
120 .pfn_mkwrite = ext2_dax_fault,
121};
122
123static int ext2_file_mmap(struct file *file, struct vm_area_struct *vma)
124{
125 if (!IS_DAX(file_inode(file)))
126 return generic_file_mmap(file, vma);
127
128 file_accessed(file);
129 vma->vm_ops = &ext2_dax_vm_ops;
130 return 0;
131}
132#else
133#define ext2_file_mmap generic_file_mmap
134#endif
135
136/*
137 * Called when filp is released. This happens when all file descriptors
138 * for a single struct file are closed. Note that different open() calls
139 * for the same file yield different struct file structures.
140 */
141static int ext2_release_file (struct inode * inode, struct file * filp)
142{
143 if (filp->f_mode & FMODE_WRITE) {
144 mutex_lock(&EXT2_I(inode)->truncate_mutex);
145 ext2_discard_reservation(inode);
146 mutex_unlock(&EXT2_I(inode)->truncate_mutex);
147 }
148 return 0;
149}
150
151int ext2_fsync(struct file *file, loff_t start, loff_t end, int datasync)
152{
153 int ret;
154 struct super_block *sb = file->f_mapping->host->i_sb;
155
156 ret = generic_file_fsync(file, start, end, datasync);
157 if (ret == -EIO)
158 /* We don't really know where the IO error happened... */
159 ext2_error(sb, __func__,
160 "detected IO error when writing metadata buffers");
161 return ret;
162}
163
164static ssize_t ext2_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
165{
166#ifdef CONFIG_FS_DAX
167 if (IS_DAX(iocb->ki_filp->f_mapping->host))
168 return ext2_dax_read_iter(iocb, to);
169#endif
170 return generic_file_read_iter(iocb, to);
171}
172
173static ssize_t ext2_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
174{
175#ifdef CONFIG_FS_DAX
176 if (IS_DAX(iocb->ki_filp->f_mapping->host))
177 return ext2_dax_write_iter(iocb, from);
178#endif
179 return generic_file_write_iter(iocb, from);
180}
181
182const struct file_operations ext2_file_operations = {
183 .llseek = generic_file_llseek,
184 .read_iter = ext2_file_read_iter,
185 .write_iter = ext2_file_write_iter,
186 .unlocked_ioctl = ext2_ioctl,
187#ifdef CONFIG_COMPAT
188 .compat_ioctl = ext2_compat_ioctl,
189#endif
190 .mmap = ext2_file_mmap,
191 .open = dquot_file_open,
192 .release = ext2_release_file,
193 .fsync = ext2_fsync,
194 .get_unmapped_area = thp_get_unmapped_area,
195 .splice_read = generic_file_splice_read,
196 .splice_write = iter_file_splice_write,
197};
198
199const struct inode_operations ext2_file_inode_operations = {
200 .listxattr = ext2_listxattr,
201 .getattr = ext2_getattr,
202 .setattr = ext2_setattr,
203 .get_inode_acl = ext2_get_acl,
204 .set_acl = ext2_set_acl,
205 .fiemap = ext2_fiemap,
206 .fileattr_get = ext2_fileattr_get,
207 .fileattr_set = ext2_fileattr_set,
208};
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/fs/ext2/file.c
4 *
5 * Copyright (C) 1992, 1993, 1994, 1995
6 * Remy Card (card@masi.ibp.fr)
7 * Laboratoire MASI - Institut Blaise Pascal
8 * Universite Pierre et Marie Curie (Paris VI)
9 *
10 * from
11 *
12 * linux/fs/minix/file.c
13 *
14 * Copyright (C) 1991, 1992 Linus Torvalds
15 *
16 * ext2 fs regular file handling primitives
17 *
18 * 64-bit file support on 64-bit platforms by Jakub Jelinek
19 * (jj@sunsite.ms.mff.cuni.cz)
20 */
21
22#include <linux/time.h>
23#include <linux/pagemap.h>
24#include <linux/dax.h>
25#include <linux/quotaops.h>
26#include <linux/iomap.h>
27#include <linux/uio.h>
28#include "ext2.h"
29#include "xattr.h"
30#include "acl.h"
31
32#ifdef CONFIG_FS_DAX
33static ssize_t ext2_dax_read_iter(struct kiocb *iocb, struct iov_iter *to)
34{
35 struct inode *inode = iocb->ki_filp->f_mapping->host;
36 ssize_t ret;
37
38 if (!iov_iter_count(to))
39 return 0; /* skip atime */
40
41 inode_lock_shared(inode);
42 ret = dax_iomap_rw(iocb, to, &ext2_iomap_ops);
43 inode_unlock_shared(inode);
44
45 file_accessed(iocb->ki_filp);
46 return ret;
47}
48
49static ssize_t ext2_dax_write_iter(struct kiocb *iocb, struct iov_iter *from)
50{
51 struct file *file = iocb->ki_filp;
52 struct inode *inode = file->f_mapping->host;
53 ssize_t ret;
54
55 inode_lock(inode);
56 ret = generic_write_checks(iocb, from);
57 if (ret <= 0)
58 goto out_unlock;
59 ret = file_remove_privs(file);
60 if (ret)
61 goto out_unlock;
62 ret = file_update_time(file);
63 if (ret)
64 goto out_unlock;
65
66 ret = dax_iomap_rw(iocb, from, &ext2_iomap_ops);
67 if (ret > 0 && iocb->ki_pos > i_size_read(inode)) {
68 i_size_write(inode, iocb->ki_pos);
69 mark_inode_dirty(inode);
70 }
71
72out_unlock:
73 inode_unlock(inode);
74 if (ret > 0)
75 ret = generic_write_sync(iocb, ret);
76 return ret;
77}
78
79/*
80 * The lock ordering for ext2 DAX fault paths is:
81 *
82 * mmap_sem (MM)
83 * sb_start_pagefault (vfs, freeze)
84 * ext2_inode_info->dax_sem
85 * address_space->i_mmap_rwsem or page_lock (mutually exclusive in DAX)
86 * ext2_inode_info->truncate_mutex
87 *
88 * The default page_lock and i_size verification done by non-DAX fault paths
89 * is sufficient because ext2 doesn't support hole punching.
90 */
91static vm_fault_t ext2_dax_fault(struct vm_fault *vmf)
92{
93 struct inode *inode = file_inode(vmf->vma->vm_file);
94 struct ext2_inode_info *ei = EXT2_I(inode);
95 vm_fault_t ret;
96
97 if (vmf->flags & FAULT_FLAG_WRITE) {
98 sb_start_pagefault(inode->i_sb);
99 file_update_time(vmf->vma->vm_file);
100 }
101 down_read(&ei->dax_sem);
102
103 ret = dax_iomap_fault(vmf, PE_SIZE_PTE, NULL, NULL, &ext2_iomap_ops);
104
105 up_read(&ei->dax_sem);
106 if (vmf->flags & FAULT_FLAG_WRITE)
107 sb_end_pagefault(inode->i_sb);
108 return ret;
109}
110
111static const struct vm_operations_struct ext2_dax_vm_ops = {
112 .fault = ext2_dax_fault,
113 /*
114 * .huge_fault is not supported for DAX because allocation in ext2
115 * cannot be reliably aligned to huge page sizes and so pmd faults
116 * will always fail and fail back to regular faults.
117 */
118 .page_mkwrite = ext2_dax_fault,
119 .pfn_mkwrite = ext2_dax_fault,
120};
121
122static int ext2_file_mmap(struct file *file, struct vm_area_struct *vma)
123{
124 if (!IS_DAX(file_inode(file)))
125 return generic_file_mmap(file, vma);
126
127 file_accessed(file);
128 vma->vm_ops = &ext2_dax_vm_ops;
129 return 0;
130}
131#else
132#define ext2_file_mmap generic_file_mmap
133#endif
134
135/*
136 * Called when filp is released. This happens when all file descriptors
137 * for a single struct file are closed. Note that different open() calls
138 * for the same file yield different struct file structures.
139 */
140static int ext2_release_file (struct inode * inode, struct file * filp)
141{
142 if (filp->f_mode & FMODE_WRITE) {
143 mutex_lock(&EXT2_I(inode)->truncate_mutex);
144 ext2_discard_reservation(inode);
145 mutex_unlock(&EXT2_I(inode)->truncate_mutex);
146 }
147 return 0;
148}
149
150int ext2_fsync(struct file *file, loff_t start, loff_t end, int datasync)
151{
152 int ret;
153 struct super_block *sb = file->f_mapping->host->i_sb;
154
155 ret = generic_file_fsync(file, start, end, datasync);
156 if (ret == -EIO)
157 /* We don't really know where the IO error happened... */
158 ext2_error(sb, __func__,
159 "detected IO error when writing metadata buffers");
160 return ret;
161}
162
163static ssize_t ext2_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
164{
165#ifdef CONFIG_FS_DAX
166 if (IS_DAX(iocb->ki_filp->f_mapping->host))
167 return ext2_dax_read_iter(iocb, to);
168#endif
169 return generic_file_read_iter(iocb, to);
170}
171
172static ssize_t ext2_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
173{
174#ifdef CONFIG_FS_DAX
175 if (IS_DAX(iocb->ki_filp->f_mapping->host))
176 return ext2_dax_write_iter(iocb, from);
177#endif
178 return generic_file_write_iter(iocb, from);
179}
180
181const struct file_operations ext2_file_operations = {
182 .llseek = generic_file_llseek,
183 .read_iter = ext2_file_read_iter,
184 .write_iter = ext2_file_write_iter,
185 .unlocked_ioctl = ext2_ioctl,
186#ifdef CONFIG_COMPAT
187 .compat_ioctl = ext2_compat_ioctl,
188#endif
189 .mmap = ext2_file_mmap,
190 .open = dquot_file_open,
191 .release = ext2_release_file,
192 .fsync = ext2_fsync,
193 .get_unmapped_area = thp_get_unmapped_area,
194 .splice_read = generic_file_splice_read,
195 .splice_write = iter_file_splice_write,
196};
197
198const struct inode_operations ext2_file_inode_operations = {
199#ifdef CONFIG_EXT2_FS_XATTR
200 .listxattr = ext2_listxattr,
201#endif
202 .getattr = ext2_getattr,
203 .setattr = ext2_setattr,
204 .get_acl = ext2_get_acl,
205 .set_acl = ext2_set_acl,
206 .fiemap = ext2_fiemap,
207};