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9#include "hpfs_fn.h"
10#include <linux/mpage.h>
11
12#define BLOCKS(size) (((size) + 511) >> 9)
13
14static int hpfs_file_release(struct inode *inode, struct file *file)
15{
16 hpfs_lock(inode->i_sb);
17 hpfs_write_if_changed(inode);
18 hpfs_unlock(inode->i_sb);
19 return 0;
20}
21
22int hpfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync)
23{
24 struct inode *inode = file->f_mapping->host;
25 int ret;
26
27 ret = filemap_write_and_wait_range(file->f_mapping, start, end);
28 if (ret)
29 return ret;
30 return sync_blockdev(inode->i_sb->s_bdev);
31}
32
33
34
35
36
37
38static secno hpfs_bmap(struct inode *inode, unsigned file_secno, unsigned *n_secs)
39{
40 struct hpfs_inode_info *hpfs_inode = hpfs_i(inode);
41 unsigned n, disk_secno;
42 struct fnode *fnode;
43 struct buffer_head *bh;
44 if (BLOCKS(hpfs_i(inode)->mmu_private) <= file_secno) return 0;
45 n = file_secno - hpfs_inode->i_file_sec;
46 if (n < hpfs_inode->i_n_secs) {
47 *n_secs = hpfs_inode->i_n_secs - n;
48 return hpfs_inode->i_disk_sec + n;
49 }
50 if (!(fnode = hpfs_map_fnode(inode->i_sb, inode->i_ino, &bh))) return 0;
51 disk_secno = hpfs_bplus_lookup(inode->i_sb, inode, &fnode->btree, file_secno, bh);
52 if (disk_secno == -1) return 0;
53 if (hpfs_chk_sectors(inode->i_sb, disk_secno, 1, "bmap")) return 0;
54 n = file_secno - hpfs_inode->i_file_sec;
55 if (n < hpfs_inode->i_n_secs) {
56 *n_secs = hpfs_inode->i_n_secs - n;
57 return hpfs_inode->i_disk_sec + n;
58 }
59 *n_secs = 1;
60 return disk_secno;
61}
62
63void hpfs_truncate(struct inode *i)
64{
65 if (IS_IMMUTABLE(i)) return ;
66 hpfs_lock_assert(i->i_sb);
67
68 hpfs_i(i)->i_n_secs = 0;
69 i->i_blocks = 1 + ((i->i_size + 511) >> 9);
70 hpfs_i(i)->mmu_private = i->i_size;
71 hpfs_truncate_btree(i->i_sb, i->i_ino, 1, ((i->i_size + 511) >> 9));
72 hpfs_write_inode(i);
73 hpfs_i(i)->i_n_secs = 0;
74}
75
76static int hpfs_get_block(struct inode *inode, sector_t iblock, struct buffer_head *bh_result, int create)
77{
78 int r;
79 secno s;
80 unsigned n_secs;
81 hpfs_lock(inode->i_sb);
82 s = hpfs_bmap(inode, iblock, &n_secs);
83 if (s) {
84 if (bh_result->b_size >> 9 < n_secs)
85 n_secs = bh_result->b_size >> 9;
86 map_bh(bh_result, inode->i_sb, s);
87 bh_result->b_size = n_secs << 9;
88 goto ret_0;
89 }
90 if (!create) goto ret_0;
91 if (iblock<<9 != hpfs_i(inode)->mmu_private) {
92 BUG();
93 r = -EIO;
94 goto ret_r;
95 }
96 if ((s = hpfs_add_sector_to_btree(inode->i_sb, inode->i_ino, 1, inode->i_blocks - 1)) == -1) {
97 hpfs_truncate_btree(inode->i_sb, inode->i_ino, 1, inode->i_blocks - 1);
98 r = -ENOSPC;
99 goto ret_r;
100 }
101 inode->i_blocks++;
102 hpfs_i(inode)->mmu_private += 512;
103 set_buffer_new(bh_result);
104 map_bh(bh_result, inode->i_sb, s);
105 ret_0:
106 r = 0;
107 ret_r:
108 hpfs_unlock(inode->i_sb);
109 return r;
110}
111
112static int hpfs_readpage(struct file *file, struct page *page)
113{
114 return mpage_readpage(page, hpfs_get_block);
115}
116
117static int hpfs_writepage(struct page *page, struct writeback_control *wbc)
118{
119 return block_write_full_page(page, hpfs_get_block, wbc);
120}
121
122static int hpfs_readpages(struct file *file, struct address_space *mapping,
123 struct list_head *pages, unsigned nr_pages)
124{
125 return mpage_readpages(mapping, pages, nr_pages, hpfs_get_block);
126}
127
128static int hpfs_writepages(struct address_space *mapping,
129 struct writeback_control *wbc)
130{
131 return mpage_writepages(mapping, wbc, hpfs_get_block);
132}
133
134static void hpfs_write_failed(struct address_space *mapping, loff_t to)
135{
136 struct inode *inode = mapping->host;
137
138 hpfs_lock(inode->i_sb);
139
140 if (to > inode->i_size) {
141 truncate_pagecache(inode, inode->i_size);
142 hpfs_truncate(inode);
143 }
144
145 hpfs_unlock(inode->i_sb);
146}
147
148static int hpfs_write_begin(struct file *file, struct address_space *mapping,
149 loff_t pos, unsigned len, unsigned flags,
150 struct page **pagep, void **fsdata)
151{
152 int ret;
153
154 *pagep = NULL;
155 ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
156 hpfs_get_block,
157 &hpfs_i(mapping->host)->mmu_private);
158 if (unlikely(ret))
159 hpfs_write_failed(mapping, pos + len);
160
161 return ret;
162}
163
164static int hpfs_write_end(struct file *file, struct address_space *mapping,
165 loff_t pos, unsigned len, unsigned copied,
166 struct page *pagep, void *fsdata)
167{
168 struct inode *inode = mapping->host;
169 int err;
170 err = generic_write_end(file, mapping, pos, len, copied, pagep, fsdata);
171 if (err < len)
172 hpfs_write_failed(mapping, pos + len);
173 if (!(err < 0)) {
174
175 hpfs_lock(inode->i_sb);
176 hpfs_i(inode)->i_dirty = 1;
177 hpfs_unlock(inode->i_sb);
178 }
179 return err;
180}
181
182static sector_t _hpfs_bmap(struct address_space *mapping, sector_t block)
183{
184 return generic_block_bmap(mapping,block,hpfs_get_block);
185}
186
187const struct address_space_operations hpfs_aops = {
188 .readpage = hpfs_readpage,
189 .writepage = hpfs_writepage,
190 .readpages = hpfs_readpages,
191 .writepages = hpfs_writepages,
192 .write_begin = hpfs_write_begin,
193 .write_end = hpfs_write_end,
194 .bmap = _hpfs_bmap
195};
196
197const struct file_operations hpfs_file_ops =
198{
199 .llseek = generic_file_llseek,
200 .read = new_sync_read,
201 .read_iter = generic_file_read_iter,
202 .write = new_sync_write,
203 .write_iter = generic_file_write_iter,
204 .mmap = generic_file_mmap,
205 .release = hpfs_file_release,
206 .fsync = hpfs_file_fsync,
207 .splice_read = generic_file_splice_read,
208};
209
210const struct inode_operations hpfs_file_iops =
211{
212 .setattr = hpfs_setattr,
213};
214
