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9#include <linux/smp_lock.h>
10#include "hpfs_fn.h"
11
12#define BLOCKS(size) (((size) + 511) >> 9)
13
14static int hpfs_file_release(struct inode *inode, struct file *file)
15{
16 lock_kernel();
17 hpfs_write_if_changed(inode);
18 unlock_kernel();
19 return 0;
20}
21
22int hpfs_file_fsync(struct file *file, struct dentry *dentry, int datasync)
23{
24
25 return 0;
26}
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30
31
32
33static secno hpfs_bmap(struct inode *inode, unsigned file_secno)
34{
35 struct hpfs_inode_info *hpfs_inode = hpfs_i(inode);
36 unsigned n, disk_secno;
37 struct fnode *fnode;
38 struct buffer_head *bh;
39 if (BLOCKS(hpfs_i(inode)->mmu_private) <= file_secno) return 0;
40 n = file_secno - hpfs_inode->i_file_sec;
41 if (n < hpfs_inode->i_n_secs) return hpfs_inode->i_disk_sec + n;
42 if (!(fnode = hpfs_map_fnode(inode->i_sb, inode->i_ino, &bh))) return 0;
43 disk_secno = hpfs_bplus_lookup(inode->i_sb, inode, &fnode->btree, file_secno, bh);
44 if (disk_secno == -1) return 0;
45 if (hpfs_chk_sectors(inode->i_sb, disk_secno, 1, "bmap")) return 0;
46 return disk_secno;
47}
48
49static void hpfs_truncate(struct inode *i)
50{
51 if (IS_IMMUTABLE(i)) return ;
52 lock_kernel();
53 hpfs_i(i)->i_n_secs = 0;
54 i->i_blocks = 1 + ((i->i_size + 511) >> 9);
55 hpfs_i(i)->mmu_private = i->i_size;
56 hpfs_truncate_btree(i->i_sb, i->i_ino, 1, ((i->i_size + 511) >> 9));
57 hpfs_write_inode(i);
58 hpfs_i(i)->i_n_secs = 0;
59 unlock_kernel();
60}
61
62static int hpfs_get_block(struct inode *inode, sector_t iblock, struct buffer_head *bh_result, int create)
63{
64 secno s;
65 s = hpfs_bmap(inode, iblock);
66 if (s) {
67 map_bh(bh_result, inode->i_sb, s);
68 return 0;
69 }
70 if (!create) return 0;
71 if (iblock<<9 != hpfs_i(inode)->mmu_private) {
72 BUG();
73 return -EIO;
74 }
75 if ((s = hpfs_add_sector_to_btree(inode->i_sb, inode->i_ino, 1, inode->i_blocks - 1)) == -1) {
76 hpfs_truncate_btree(inode->i_sb, inode->i_ino, 1, inode->i_blocks - 1);
77 return -ENOSPC;
78 }
79 inode->i_blocks++;
80 hpfs_i(inode)->mmu_private += 512;
81 set_buffer_new(bh_result);
82 map_bh(bh_result, inode->i_sb, s);
83 return 0;
84}
85
86static int hpfs_writepage(struct page *page, struct writeback_control *wbc)
87{
88 return block_write_full_page(page,hpfs_get_block, wbc);
89}
90
91static int hpfs_readpage(struct file *file, struct page *page)
92{
93 return block_read_full_page(page,hpfs_get_block);
94}
95
96static int hpfs_write_begin(struct file *file, struct address_space *mapping,
97 loff_t pos, unsigned len, unsigned flags,
98 struct page **pagep, void **fsdata)
99{
100 *pagep = NULL;
101 return cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
102 hpfs_get_block,
103 &hpfs_i(mapping->host)->mmu_private);
104}
105
106static sector_t _hpfs_bmap(struct address_space *mapping, sector_t block)
107{
108 return generic_block_bmap(mapping,block,hpfs_get_block);
109}
110
111const struct address_space_operations hpfs_aops = {
112 .readpage = hpfs_readpage,
113 .writepage = hpfs_writepage,
114 .sync_page = block_sync_page,
115 .write_begin = hpfs_write_begin,
116 .write_end = generic_write_end,
117 .bmap = _hpfs_bmap
118};
119
120static ssize_t hpfs_file_write(struct file *file, const char __user *buf,
121 size_t count, loff_t *ppos)
122{
123 ssize_t retval;
124
125 retval = do_sync_write(file, buf, count, ppos);
126 if (retval > 0)
127 hpfs_i(file->f_path.dentry->d_inode)->i_dirty = 1;
128 return retval;
129}
130
131const struct file_operations hpfs_file_ops =
132{
133 .llseek = generic_file_llseek,
134 .read = do_sync_read,
135 .aio_read = generic_file_aio_read,
136 .write = hpfs_file_write,
137 .aio_write = generic_file_aio_write,
138 .mmap = generic_file_mmap,
139 .release = hpfs_file_release,
140 .fsync = hpfs_file_fsync,
141 .splice_read = generic_file_splice_read,
142};
143
144const struct inode_operations hpfs_file_iops =
145{
146 .truncate = hpfs_truncate,
147 .setattr = hpfs_setattr,
148};
149
