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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};
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#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 * generic_file_read often calls bmap with non-existing sector,
35 * so we must ignore such errors.
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 /*-EPERM*/;
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 /* make sure we write it on close, if not earlier */
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 = do_sync_read,
201 .aio_read = generic_file_aio_read,
202 .write = do_sync_write,
203 .aio_write = generic_file_aio_write,
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};