Loading...
1// SPDX-License-Identifier: GPL-2.0
2/*
3 * linux/fs/hpfs/file.c
4 *
5 * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
6 *
7 * file VFS functions
8 */
9
10#include "hpfs_fn.h"
11#include <linux/mpage.h>
12#include <linux/iomap.h>
13#include <linux/fiemap.h>
14
15#define BLOCKS(size) (((size) + 511) >> 9)
16
17static int hpfs_file_release(struct inode *inode, struct file *file)
18{
19 hpfs_lock(inode->i_sb);
20 hpfs_write_if_changed(inode);
21 hpfs_unlock(inode->i_sb);
22 return 0;
23}
24
25int hpfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync)
26{
27 struct inode *inode = file->f_mapping->host;
28 int ret;
29
30 ret = file_write_and_wait_range(file, start, end);
31 if (ret)
32 return ret;
33 return sync_blockdev(inode->i_sb->s_bdev);
34}
35
36/*
37 * generic_file_read often calls bmap with non-existing sector,
38 * so we must ignore such errors.
39 */
40
41static secno hpfs_bmap(struct inode *inode, unsigned file_secno, unsigned *n_secs)
42{
43 struct hpfs_inode_info *hpfs_inode = hpfs_i(inode);
44 unsigned n, disk_secno;
45 struct fnode *fnode;
46 struct buffer_head *bh;
47 if (BLOCKS(hpfs_i(inode)->mmu_private) <= file_secno) return 0;
48 n = file_secno - hpfs_inode->i_file_sec;
49 if (n < hpfs_inode->i_n_secs) {
50 *n_secs = hpfs_inode->i_n_secs - n;
51 return hpfs_inode->i_disk_sec + n;
52 }
53 if (!(fnode = hpfs_map_fnode(inode->i_sb, inode->i_ino, &bh))) return 0;
54 disk_secno = hpfs_bplus_lookup(inode->i_sb, inode, &fnode->btree, file_secno, bh);
55 if (disk_secno == -1) return 0;
56 if (hpfs_chk_sectors(inode->i_sb, disk_secno, 1, "bmap")) return 0;
57 n = file_secno - hpfs_inode->i_file_sec;
58 if (n < hpfs_inode->i_n_secs) {
59 *n_secs = hpfs_inode->i_n_secs - n;
60 return hpfs_inode->i_disk_sec + n;
61 }
62 *n_secs = 1;
63 return disk_secno;
64}
65
66void hpfs_truncate(struct inode *i)
67{
68 if (IS_IMMUTABLE(i)) return /*-EPERM*/;
69 hpfs_lock_assert(i->i_sb);
70
71 hpfs_i(i)->i_n_secs = 0;
72 i->i_blocks = 1 + ((i->i_size + 511) >> 9);
73 hpfs_i(i)->mmu_private = i->i_size;
74 hpfs_truncate_btree(i->i_sb, i->i_ino, 1, ((i->i_size + 511) >> 9));
75 hpfs_write_inode(i);
76 hpfs_i(i)->i_n_secs = 0;
77}
78
79static int hpfs_get_block(struct inode *inode, sector_t iblock, struct buffer_head *bh_result, int create)
80{
81 int r;
82 secno s;
83 unsigned n_secs;
84 hpfs_lock(inode->i_sb);
85 s = hpfs_bmap(inode, iblock, &n_secs);
86 if (s) {
87 if (bh_result->b_size >> 9 < n_secs)
88 n_secs = bh_result->b_size >> 9;
89 n_secs = hpfs_search_hotfix_map_for_range(inode->i_sb, s, n_secs);
90 if (unlikely(!n_secs)) {
91 s = hpfs_search_hotfix_map(inode->i_sb, s);
92 n_secs = 1;
93 }
94 map_bh(bh_result, inode->i_sb, s);
95 bh_result->b_size = n_secs << 9;
96 goto ret_0;
97 }
98 if (!create) goto ret_0;
99 if (iblock<<9 != hpfs_i(inode)->mmu_private) {
100 BUG();
101 r = -EIO;
102 goto ret_r;
103 }
104 if ((s = hpfs_add_sector_to_btree(inode->i_sb, inode->i_ino, 1, inode->i_blocks - 1)) == -1) {
105 hpfs_truncate_btree(inode->i_sb, inode->i_ino, 1, inode->i_blocks - 1);
106 r = -ENOSPC;
107 goto ret_r;
108 }
109 inode->i_blocks++;
110 hpfs_i(inode)->mmu_private += 512;
111 set_buffer_new(bh_result);
112 map_bh(bh_result, inode->i_sb, hpfs_search_hotfix_map(inode->i_sb, s));
113 ret_0:
114 r = 0;
115 ret_r:
116 hpfs_unlock(inode->i_sb);
117 return r;
118}
119
120static int hpfs_iomap_begin(struct inode *inode, loff_t offset, loff_t length,
121 unsigned flags, struct iomap *iomap, struct iomap *srcmap)
122{
123 struct super_block *sb = inode->i_sb;
124 unsigned int blkbits = inode->i_blkbits;
125 unsigned int n_secs;
126 secno s;
127
128 if (WARN_ON_ONCE(flags & (IOMAP_WRITE | IOMAP_ZERO)))
129 return -EINVAL;
130
131 iomap->bdev = inode->i_sb->s_bdev;
132 iomap->offset = offset;
133
134 hpfs_lock(sb);
135 s = hpfs_bmap(inode, offset >> blkbits, &n_secs);
136 if (s) {
137 n_secs = hpfs_search_hotfix_map_for_range(sb, s,
138 min_t(loff_t, n_secs, length));
139 if (unlikely(!n_secs)) {
140 s = hpfs_search_hotfix_map(sb, s);
141 n_secs = 1;
142 }
143 iomap->type = IOMAP_MAPPED;
144 iomap->flags = IOMAP_F_MERGED;
145 iomap->addr = (u64)s << blkbits;
146 iomap->length = (u64)n_secs << blkbits;
147 } else {
148 iomap->type = IOMAP_HOLE;
149 iomap->addr = IOMAP_NULL_ADDR;
150 iomap->length = 1 << blkbits;
151 }
152
153 hpfs_unlock(sb);
154 return 0;
155}
156
157static const struct iomap_ops hpfs_iomap_ops = {
158 .iomap_begin = hpfs_iomap_begin,
159};
160
161static int hpfs_read_folio(struct file *file, struct folio *folio)
162{
163 return mpage_read_folio(folio, hpfs_get_block);
164}
165
166static void hpfs_readahead(struct readahead_control *rac)
167{
168 mpage_readahead(rac, hpfs_get_block);
169}
170
171static int hpfs_writepages(struct address_space *mapping,
172 struct writeback_control *wbc)
173{
174 return mpage_writepages(mapping, wbc, hpfs_get_block);
175}
176
177static void hpfs_write_failed(struct address_space *mapping, loff_t to)
178{
179 struct inode *inode = mapping->host;
180
181 hpfs_lock(inode->i_sb);
182
183 if (to > inode->i_size) {
184 truncate_pagecache(inode, inode->i_size);
185 hpfs_truncate(inode);
186 }
187
188 hpfs_unlock(inode->i_sb);
189}
190
191static int hpfs_write_begin(struct file *file, struct address_space *mapping,
192 loff_t pos, unsigned len,
193 struct page **pagep, void **fsdata)
194{
195 int ret;
196
197 *pagep = NULL;
198 ret = cont_write_begin(file, mapping, pos, len, pagep, fsdata,
199 hpfs_get_block,
200 &hpfs_i(mapping->host)->mmu_private);
201 if (unlikely(ret))
202 hpfs_write_failed(mapping, pos + len);
203
204 return ret;
205}
206
207static int hpfs_write_end(struct file *file, struct address_space *mapping,
208 loff_t pos, unsigned len, unsigned copied,
209 struct page *pagep, void *fsdata)
210{
211 struct inode *inode = mapping->host;
212 int err;
213 err = generic_write_end(file, mapping, pos, len, copied, pagep, fsdata);
214 if (err < len)
215 hpfs_write_failed(mapping, pos + len);
216 if (!(err < 0)) {
217 /* make sure we write it on close, if not earlier */
218 hpfs_lock(inode->i_sb);
219 hpfs_i(inode)->i_dirty = 1;
220 hpfs_unlock(inode->i_sb);
221 }
222 return err;
223}
224
225static sector_t _hpfs_bmap(struct address_space *mapping, sector_t block)
226{
227 return generic_block_bmap(mapping, block, hpfs_get_block);
228}
229
230static int hpfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, u64 start, u64 len)
231{
232 int ret;
233
234 inode_lock(inode);
235 len = min_t(u64, len, i_size_read(inode));
236 ret = iomap_fiemap(inode, fieinfo, start, len, &hpfs_iomap_ops);
237 inode_unlock(inode);
238
239 return ret;
240}
241
242const struct address_space_operations hpfs_aops = {
243 .dirty_folio = block_dirty_folio,
244 .invalidate_folio = block_invalidate_folio,
245 .read_folio = hpfs_read_folio,
246 .readahead = hpfs_readahead,
247 .writepages = hpfs_writepages,
248 .write_begin = hpfs_write_begin,
249 .write_end = hpfs_write_end,
250 .bmap = _hpfs_bmap,
251 .migrate_folio = buffer_migrate_folio,
252};
253
254const struct file_operations hpfs_file_ops =
255{
256 .llseek = generic_file_llseek,
257 .read_iter = generic_file_read_iter,
258 .write_iter = generic_file_write_iter,
259 .mmap = generic_file_mmap,
260 .release = hpfs_file_release,
261 .fsync = hpfs_file_fsync,
262 .splice_read = generic_file_splice_read,
263 .unlocked_ioctl = hpfs_ioctl,
264 .compat_ioctl = compat_ptr_ioctl,
265};
266
267const struct inode_operations hpfs_file_iops =
268{
269 .setattr = hpfs_setattr,
270 .fiemap = hpfs_fiemap,
271};
1/*
2 * linux/fs/hpfs/file.c
3 *
4 * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
5 *
6 * file VFS functions
7 */
8
9#include "hpfs_fn.h"
10
11#define BLOCKS(size) (((size) + 511) >> 9)
12
13static int hpfs_file_release(struct inode *inode, struct file *file)
14{
15 hpfs_lock(inode->i_sb);
16 hpfs_write_if_changed(inode);
17 hpfs_unlock(inode->i_sb);
18 return 0;
19}
20
21int hpfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync)
22{
23 struct inode *inode = file->f_mapping->host;
24 int ret;
25
26 ret = filemap_write_and_wait_range(file->f_mapping, start, end);
27 if (ret)
28 return ret;
29 return sync_blockdev(inode->i_sb->s_bdev);
30}
31
32/*
33 * generic_file_read often calls bmap with non-existing sector,
34 * so we must ignore such errors.
35 */
36
37static secno hpfs_bmap(struct inode *inode, unsigned file_secno)
38{
39 struct hpfs_inode_info *hpfs_inode = hpfs_i(inode);
40 unsigned n, disk_secno;
41 struct fnode *fnode;
42 struct buffer_head *bh;
43 if (BLOCKS(hpfs_i(inode)->mmu_private) <= file_secno) return 0;
44 n = file_secno - hpfs_inode->i_file_sec;
45 if (n < hpfs_inode->i_n_secs) return hpfs_inode->i_disk_sec + n;
46 if (!(fnode = hpfs_map_fnode(inode->i_sb, inode->i_ino, &bh))) return 0;
47 disk_secno = hpfs_bplus_lookup(inode->i_sb, inode, &fnode->btree, file_secno, bh);
48 if (disk_secno == -1) return 0;
49 if (hpfs_chk_sectors(inode->i_sb, disk_secno, 1, "bmap")) return 0;
50 return disk_secno;
51}
52
53static void hpfs_truncate(struct inode *i)
54{
55 if (IS_IMMUTABLE(i)) return /*-EPERM*/;
56 hpfs_lock_assert(i->i_sb);
57
58 hpfs_i(i)->i_n_secs = 0;
59 i->i_blocks = 1 + ((i->i_size + 511) >> 9);
60 hpfs_i(i)->mmu_private = i->i_size;
61 hpfs_truncate_btree(i->i_sb, i->i_ino, 1, ((i->i_size + 511) >> 9));
62 hpfs_write_inode(i);
63 hpfs_i(i)->i_n_secs = 0;
64}
65
66static int hpfs_get_block(struct inode *inode, sector_t iblock, struct buffer_head *bh_result, int create)
67{
68 int r;
69 secno s;
70 hpfs_lock(inode->i_sb);
71 s = hpfs_bmap(inode, iblock);
72 if (s) {
73 map_bh(bh_result, inode->i_sb, s);
74 goto ret_0;
75 }
76 if (!create) goto ret_0;
77 if (iblock<<9 != hpfs_i(inode)->mmu_private) {
78 BUG();
79 r = -EIO;
80 goto ret_r;
81 }
82 if ((s = hpfs_add_sector_to_btree(inode->i_sb, inode->i_ino, 1, inode->i_blocks - 1)) == -1) {
83 hpfs_truncate_btree(inode->i_sb, inode->i_ino, 1, inode->i_blocks - 1);
84 r = -ENOSPC;
85 goto ret_r;
86 }
87 inode->i_blocks++;
88 hpfs_i(inode)->mmu_private += 512;
89 set_buffer_new(bh_result);
90 map_bh(bh_result, inode->i_sb, s);
91 ret_0:
92 r = 0;
93 ret_r:
94 hpfs_unlock(inode->i_sb);
95 return r;
96}
97
98static int hpfs_writepage(struct page *page, struct writeback_control *wbc)
99{
100 return block_write_full_page(page,hpfs_get_block, wbc);
101}
102
103static int hpfs_readpage(struct file *file, struct page *page)
104{
105 return block_read_full_page(page,hpfs_get_block);
106}
107
108static int hpfs_write_begin(struct file *file, struct address_space *mapping,
109 loff_t pos, unsigned len, unsigned flags,
110 struct page **pagep, void **fsdata)
111{
112 int ret;
113
114 *pagep = NULL;
115 ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
116 hpfs_get_block,
117 &hpfs_i(mapping->host)->mmu_private);
118 if (unlikely(ret)) {
119 loff_t isize = mapping->host->i_size;
120 if (pos + len > isize)
121 vmtruncate(mapping->host, isize);
122 }
123
124 return ret;
125}
126
127static sector_t _hpfs_bmap(struct address_space *mapping, sector_t block)
128{
129 return generic_block_bmap(mapping,block,hpfs_get_block);
130}
131
132const struct address_space_operations hpfs_aops = {
133 .readpage = hpfs_readpage,
134 .writepage = hpfs_writepage,
135 .write_begin = hpfs_write_begin,
136 .write_end = generic_write_end,
137 .bmap = _hpfs_bmap
138};
139
140static ssize_t hpfs_file_write(struct file *file, const char __user *buf,
141 size_t count, loff_t *ppos)
142{
143 ssize_t retval;
144
145 retval = do_sync_write(file, buf, count, ppos);
146 if (retval > 0) {
147 hpfs_lock(file->f_path.dentry->d_sb);
148 hpfs_i(file->f_path.dentry->d_inode)->i_dirty = 1;
149 hpfs_unlock(file->f_path.dentry->d_sb);
150 }
151 return retval;
152}
153
154const struct file_operations hpfs_file_ops =
155{
156 .llseek = generic_file_llseek,
157 .read = do_sync_read,
158 .aio_read = generic_file_aio_read,
159 .write = hpfs_file_write,
160 .aio_write = generic_file_aio_write,
161 .mmap = generic_file_mmap,
162 .release = hpfs_file_release,
163 .fsync = hpfs_file_fsync,
164 .splice_read = generic_file_splice_read,
165};
166
167const struct inode_operations hpfs_file_iops =
168{
169 .truncate = hpfs_truncate,
170 .setattr = hpfs_setattr,
171};