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ae98043f | 1 | // SPDX-License-Identifier: GPL-2.0+ |
f183ff4f | 2 | /* |
94ee1d91 | 3 | * NILFS regular file handling primitives including fsync(). |
f183ff4f RK |
4 | * |
5 | * Copyright (C) 2005-2008 Nippon Telegraph and Telephone Corporation. | |
6 | * | |
4b420ab4 | 7 | * Written by Amagai Yoshiji and Ryusuke Konishi. |
f183ff4f RK |
8 | */ |
9 | ||
10 | #include <linux/fs.h> | |
11 | #include <linux/mm.h> | |
12 | #include <linux/writeback.h> | |
13 | #include "nilfs.h" | |
14 | #include "segment.h" | |
15 | ||
02c24a82 | 16 | int nilfs_sync_file(struct file *file, loff_t start, loff_t end, int datasync) |
f183ff4f RK |
17 | { |
18 | /* | |
19 | * Called from fsync() system call | |
20 | * This is the only entry point that can catch write and synch | |
21 | * timing for both data blocks and intermediate blocks. | |
22 | * | |
23 | * This function should be implemented when the writeback function | |
24 | * will be implemented. | |
25 | */ | |
11475975 | 26 | struct the_nilfs *nilfs; |
7ea80859 | 27 | struct inode *inode = file->f_mapping->host; |
75dc857c | 28 | int err = 0; |
02c24a82 | 29 | |
11475975 RK |
30 | if (nilfs_inode_dirty(inode)) { |
31 | if (datasync) | |
32 | err = nilfs_construct_dsync_segment(inode->i_sb, inode, | |
75dc857c | 33 | start, end); |
11475975 RK |
34 | else |
35 | err = nilfs_construct_segment(inode->i_sb); | |
02c24a82 | 36 | } |
11475975 RK |
37 | |
38 | nilfs = inode->i_sb->s_fs_info; | |
e2c7617a AR |
39 | if (!err) |
40 | err = nilfs_flush_device(nilfs); | |
41 | ||
f183ff4f RK |
42 | return err; |
43 | } | |
44 | ||
c8ed98cd | 45 | static vm_fault_t nilfs_page_mkwrite(struct vm_fault *vmf) |
f183ff4f | 46 | { |
11bac800 | 47 | struct vm_area_struct *vma = vmf->vma; |
5a5cad8c | 48 | struct folio *folio = page_folio(vmf->page); |
496ad9aa | 49 | struct inode *inode = file_inode(vma->vm_file); |
9ff05123 | 50 | struct nilfs_transaction_info ti; |
5a5cad8c | 51 | struct buffer_head *bh, *head; |
2c22b337 | 52 | int ret = 0; |
9ff05123 | 53 | |
e3154e97 | 54 | if (unlikely(nilfs_near_disk_full(inode->i_sb->s_fs_info))) |
9ff05123 RK |
55 | return VM_FAULT_SIGBUS; /* -ENOSPC */ |
56 | ||
2c22b337 | 57 | sb_start_pagefault(inode->i_sb); |
5a5cad8c MWO |
58 | folio_lock(folio); |
59 | if (folio->mapping != inode->i_mapping || | |
60 | folio_pos(folio) >= i_size_read(inode) || | |
61 | !folio_test_uptodate(folio)) { | |
62 | folio_unlock(folio); | |
2c22b337 JK |
63 | ret = -EFAULT; /* make the VM retry the fault */ |
64 | goto out; | |
9ff05123 RK |
65 | } |
66 | ||
67 | /* | |
5a5cad8c | 68 | * check to see if the folio is mapped already (no holes) |
9ff05123 | 69 | */ |
5a5cad8c | 70 | if (folio_test_mappedtodisk(folio)) |
9ff05123 | 71 | goto mapped; |
34094537 | 72 | |
5a5cad8c MWO |
73 | head = folio_buffers(folio); |
74 | if (head) { | |
9ff05123 RK |
75 | int fully_mapped = 1; |
76 | ||
5a5cad8c | 77 | bh = head; |
9ff05123 RK |
78 | do { |
79 | if (!buffer_mapped(bh)) { | |
80 | fully_mapped = 0; | |
81 | break; | |
82 | } | |
83 | } while (bh = bh->b_this_page, bh != head); | |
84 | ||
85 | if (fully_mapped) { | |
5a5cad8c | 86 | folio_set_mappedtodisk(folio); |
9ff05123 RK |
87 | goto mapped; |
88 | } | |
89 | } | |
5a5cad8c | 90 | folio_unlock(folio); |
9ff05123 RK |
91 | |
92 | /* | |
93 | * fill hole blocks | |
94 | */ | |
95 | ret = nilfs_transaction_begin(inode->i_sb, &ti, 1); | |
96 | /* never returns -ENOMEM, but may return -ENOSPC */ | |
97 | if (unlikely(ret)) | |
2c22b337 | 98 | goto out; |
9ff05123 | 99 | |
041bbb6d | 100 | file_update_time(vma->vm_file); |
5c500029 | 101 | ret = block_page_mkwrite(vma, vmf, nilfs_get_block); |
2c22b337 | 102 | if (ret) { |
9ff05123 | 103 | nilfs_transaction_abort(inode->i_sb); |
2c22b337 | 104 | goto out; |
9ff05123 | 105 | } |
34094537 | 106 | nilfs_set_file_dirty(inode, 1 << (PAGE_SHIFT - inode->i_blkbits)); |
9ff05123 RK |
107 | nilfs_transaction_commit(inode->i_sb); |
108 | ||
109 | mapped: | |
38296afe RK |
110 | /* |
111 | * Since checksumming including data blocks is performed to determine | |
112 | * the validity of the log to be written and used for recovery, it is | |
113 | * necessary to wait for writeback to finish here, regardless of the | |
114 | * stable write requirement of the backing device. | |
115 | */ | |
116 | folio_wait_writeback(folio); | |
2c22b337 JK |
117 | out: |
118 | sb_end_pagefault(inode->i_sb); | |
2ba39cc4 | 119 | return vmf_fs_error(ret); |
f183ff4f RK |
120 | } |
121 | ||
f0f37e2f | 122 | static const struct vm_operations_struct nilfs_file_vm_ops = { |
f183ff4f | 123 | .fault = filemap_fault, |
f1820361 | 124 | .map_pages = filemap_map_pages, |
f183ff4f RK |
125 | .page_mkwrite = nilfs_page_mkwrite, |
126 | }; | |
127 | ||
128 | static int nilfs_file_mmap(struct file *file, struct vm_area_struct *vma) | |
129 | { | |
130 | file_accessed(file); | |
131 | vma->vm_ops = &nilfs_file_vm_ops; | |
f183ff4f RK |
132 | return 0; |
133 | } | |
134 | ||
135 | /* | |
136 | * We have mostly NULL's here: the current defaults are ok for | |
137 | * the nilfs filesystem. | |
138 | */ | |
828c0950 | 139 | const struct file_operations nilfs_file_operations = { |
f183ff4f | 140 | .llseek = generic_file_llseek, |
aad4f8bb | 141 | .read_iter = generic_file_read_iter, |
8174202b | 142 | .write_iter = generic_file_write_iter, |
7a946193 | 143 | .unlocked_ioctl = nilfs_ioctl, |
f183ff4f | 144 | #ifdef CONFIG_COMPAT |
828b1c50 | 145 | .compat_ioctl = nilfs_compat_ioctl, |
f183ff4f RK |
146 | #endif /* CONFIG_COMPAT */ |
147 | .mmap = nilfs_file_mmap, | |
148 | .open = generic_file_open, | |
149 | /* .release = nilfs_release_file, */ | |
150 | .fsync = nilfs_sync_file, | |
2cb1e089 | 151 | .splice_read = filemap_splice_read, |
a35d8f01 | 152 | .splice_write = iter_file_splice_write, |
f183ff4f RK |
153 | }; |
154 | ||
6e1d5dcc | 155 | const struct inode_operations nilfs_file_inode_operations = { |
f183ff4f RK |
156 | .setattr = nilfs_setattr, |
157 | .permission = nilfs_permission, | |
622daaff | 158 | .fiemap = nilfs_fiemap, |
7c7c436e MS |
159 | .fileattr_get = nilfs_fileattr_get, |
160 | .fileattr_set = nilfs_fileattr_set, | |
f183ff4f RK |
161 | }; |
162 | ||
163 | /* end of file */ |