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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 lock_kernel();
16 hpfs_write_if_changed(inode);
17 unlock_kernel();
18 return 0;
19}
20
21int hpfs_file_fsync(struct file *file, struct dentry *dentry, int datasync)
22{
23
24 return 0;
25}
26
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30
31
32static secno hpfs_bmap(struct inode *inode, unsigned file_secno)
33{
34 struct hpfs_inode_info *hpfs_inode = hpfs_i(inode);
35 unsigned n, disk_secno;
36 struct fnode *fnode;
37 struct buffer_head *bh;
38 if (BLOCKS(hpfs_i(inode)->mmu_private) <= file_secno) return 0;
39 n = file_secno - hpfs_inode->i_file_sec;
40 if (n < hpfs_inode->i_n_secs) return hpfs_inode->i_disk_sec + n;
41 if (!(fnode = hpfs_map_fnode(inode->i_sb, inode->i_ino, &bh))) return 0;
42 disk_secno = hpfs_bplus_lookup(inode->i_sb, inode, &fnode->btree, file_secno, bh);
43 if (disk_secno == -1) return 0;
44 if (hpfs_chk_sectors(inode->i_sb, disk_secno, 1, "bmap")) return 0;
45 return disk_secno;
46}
47
48static void hpfs_truncate(struct inode *i)
49{
50 if (IS_IMMUTABLE(i)) return ;
51 lock_kernel();
52 hpfs_i(i)->i_n_secs = 0;
53 i->i_blocks = 1 + ((i->i_size + 511) >> 9);
54 hpfs_i(i)->mmu_private = i->i_size;
55 hpfs_truncate_btree(i->i_sb, i->i_ino, 1, ((i->i_size + 511) >> 9));
56 hpfs_write_inode(i);
57 hpfs_i(i)->i_n_secs = 0;
58 unlock_kernel();
59}
60
61static int hpfs_get_block(struct inode *inode, sector_t iblock, struct buffer_head *bh_result, int create)
62{
63 secno s;
64 s = hpfs_bmap(inode, iblock);
65 if (s) {
66 map_bh(bh_result, inode->i_sb, s);
67 return 0;
68 }
69 if (!create) return 0;
70 if (iblock<<9 != hpfs_i(inode)->mmu_private) {
71 BUG();
72 return -EIO;
73 }
74 if ((s = hpfs_add_sector_to_btree(inode->i_sb, inode->i_ino, 1, inode->i_blocks - 1)) == -1) {
75 hpfs_truncate_btree(inode->i_sb, inode->i_ino, 1, inode->i_blocks - 1);
76 return -ENOSPC;
77 }
78 inode->i_blocks++;
79 hpfs_i(inode)->mmu_private += 512;
80 set_buffer_new(bh_result);
81 map_bh(bh_result, inode->i_sb, s);
82 return 0;
83}
84
85static int hpfs_writepage(struct page *page, struct writeback_control *wbc)
86{
87 return block_write_full_page(page,hpfs_get_block, wbc);
88}
89
90static int hpfs_readpage(struct file *file, struct page *page)
91{
92 return block_read_full_page(page,hpfs_get_block);
93}
94
95static int hpfs_write_begin(struct file *file, struct address_space *mapping,
96 loff_t pos, unsigned len, unsigned flags,
97 struct page **pagep, void **fsdata)
98{
99 *pagep = NULL;
100 return cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
101 hpfs_get_block,
102 &hpfs_i(mapping->host)->mmu_private);
103}
104
105static sector_t _hpfs_bmap(struct address_space *mapping, sector_t block)
106{
107 return generic_block_bmap(mapping,block,hpfs_get_block);
108}
109
110const struct address_space_operations hpfs_aops = {
111 .readpage = hpfs_readpage,
112 .writepage = hpfs_writepage,
113 .sync_page = block_sync_page,
114 .write_begin = hpfs_write_begin,
115 .write_end = generic_write_end,
116 .bmap = _hpfs_bmap
117};
118
119static ssize_t hpfs_file_write(struct file *file, const char __user *buf,
120 size_t count, loff_t *ppos)
121{
122 ssize_t retval;
123
124 retval = do_sync_write(file, buf, count, ppos);
125 if (retval > 0)
126 hpfs_i(file->f_path.dentry->d_inode)->i_dirty = 1;
127 return retval;
128}
129
130const struct file_operations hpfs_file_ops =
131{
132 .llseek = generic_file_llseek,
133 .read = do_sync_read,
134 .aio_read = generic_file_aio_read,
135 .write = hpfs_file_write,
136 .aio_write = generic_file_aio_write,
137 .mmap = generic_file_mmap,
138 .release = hpfs_file_release,
139 .fsync = hpfs_file_fsync,
140 .splice_read = generic_file_splice_read,
141};
142
143const struct inode_operations hpfs_file_iops =
144{
145 .truncate = hpfs_truncate,
146 .setattr = hpfs_notify_change,
147};
148
