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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
38
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 ;
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_readpage(struct file *file, struct page *page)
162{
163 return mpage_readpage(page, hpfs_get_block);
164}
165
166static int hpfs_writepage(struct page *page, struct writeback_control *wbc)
167{
168 return block_write_full_page(page, hpfs_get_block, wbc);
169}
170
171static void hpfs_readahead(struct readahead_control *rac)
172{
173 mpage_readahead(rac, hpfs_get_block);
174}
175
176static int hpfs_writepages(struct address_space *mapping,
177 struct writeback_control *wbc)
178{
179 return mpage_writepages(mapping, wbc, hpfs_get_block);
180}
181
182static void hpfs_write_failed(struct address_space *mapping, loff_t to)
183{
184 struct inode *inode = mapping->host;
185
186 hpfs_lock(inode->i_sb);
187
188 if (to > inode->i_size) {
189 truncate_pagecache(inode, inode->i_size);
190 hpfs_truncate(inode);
191 }
192
193 hpfs_unlock(inode->i_sb);
194}
195
196static int hpfs_write_begin(struct file *file, struct address_space *mapping,
197 loff_t pos, unsigned len, unsigned flags,
198 struct page **pagep, void **fsdata)
199{
200 int ret;
201
202 *pagep = NULL;
203 ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
204 hpfs_get_block,
205 &hpfs_i(mapping->host)->mmu_private);
206 if (unlikely(ret))
207 hpfs_write_failed(mapping, pos + len);
208
209 return ret;
210}
211
212static int hpfs_write_end(struct file *file, struct address_space *mapping,
213 loff_t pos, unsigned len, unsigned copied,
214 struct page *pagep, void *fsdata)
215{
216 struct inode *inode = mapping->host;
217 int err;
218 err = generic_write_end(file, mapping, pos, len, copied, pagep, fsdata);
219 if (err < len)
220 hpfs_write_failed(mapping, pos + len);
221 if (!(err < 0)) {
222
223 hpfs_lock(inode->i_sb);
224 hpfs_i(inode)->i_dirty = 1;
225 hpfs_unlock(inode->i_sb);
226 }
227 return err;
228}
229
230static sector_t _hpfs_bmap(struct address_space *mapping, sector_t block)
231{
232 return generic_block_bmap(mapping, block, hpfs_get_block);
233}
234
235static int hpfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, u64 start, u64 len)
236{
237 int ret;
238
239 inode_lock(inode);
240 len = min_t(u64, len, i_size_read(inode));
241 ret = iomap_fiemap(inode, fieinfo, start, len, &hpfs_iomap_ops);
242 inode_unlock(inode);
243
244 return ret;
245}
246
247const struct address_space_operations hpfs_aops = {
248 .set_page_dirty = __set_page_dirty_buffers,
249 .readpage = hpfs_readpage,
250 .writepage = hpfs_writepage,
251 .readahead = hpfs_readahead,
252 .writepages = hpfs_writepages,
253 .write_begin = hpfs_write_begin,
254 .write_end = hpfs_write_end,
255 .bmap = _hpfs_bmap
256};
257
258const struct file_operations hpfs_file_ops =
259{
260 .llseek = generic_file_llseek,
261 .read_iter = generic_file_read_iter,
262 .write_iter = generic_file_write_iter,
263 .mmap = generic_file_mmap,
264 .release = hpfs_file_release,
265 .fsync = hpfs_file_fsync,
266 .splice_read = generic_file_splice_read,
267 .unlocked_ioctl = hpfs_ioctl,
268 .compat_ioctl = compat_ptr_ioctl,
269};
270
271const struct inode_operations hpfs_file_iops =
272{
273 .setattr = hpfs_setattr,
274 .fiemap = hpfs_fiemap,
275};
276
