get rid of cont_write_begin_newtrunc
[linux-2.6.git] / fs / hpfs / file.c
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 <linux/smp_lock.h>
10 #include "hpfs_fn.h"
11
12 #define BLOCKS(size) (((size) + 511) >> 9)
13
14 static 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
22 int hpfs_file_fsync(struct file *file, int datasync)
23 {
24         /*return file_fsync(file, datasync);*/
25         return 0; /* Don't fsync :-) */
26 }
27
28 /*
29  * generic_file_read often calls bmap with non-existing sector,
30  * so we must ignore such errors.
31  */
32
33 static 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
49 static void hpfs_truncate(struct inode *i)
50 {
51         if (IS_IMMUTABLE(i)) return /*-EPERM*/;
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
62 static 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
86 static int hpfs_writepage(struct page *page, struct writeback_control *wbc)
87 {
88         return block_write_full_page(page,hpfs_get_block, wbc);
89 }
90
91 static int hpfs_readpage(struct file *file, struct page *page)
92 {
93         return block_read_full_page(page,hpfs_get_block);
94 }
95
96 static 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         int ret;
101
102         *pagep = NULL;
103         ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
104                                 hpfs_get_block,
105                                 &hpfs_i(mapping->host)->mmu_private);
106         if (unlikely(ret)) {
107                 loff_t isize = mapping->host->i_size;
108                 if (pos + len > isize)
109                         vmtruncate(mapping->host, isize);
110         }
111
112         return ret;
113 }
114
115 static sector_t _hpfs_bmap(struct address_space *mapping, sector_t block)
116 {
117         return generic_block_bmap(mapping,block,hpfs_get_block);
118 }
119
120 const struct address_space_operations hpfs_aops = {
121         .readpage = hpfs_readpage,
122         .writepage = hpfs_writepage,
123         .sync_page = block_sync_page,
124         .write_begin = hpfs_write_begin,
125         .write_end = generic_write_end,
126         .bmap = _hpfs_bmap
127 };
128
129 static ssize_t hpfs_file_write(struct file *file, const char __user *buf,
130                         size_t count, loff_t *ppos)
131 {
132         ssize_t retval;
133
134         retval = do_sync_write(file, buf, count, ppos);
135         if (retval > 0)
136                 hpfs_i(file->f_path.dentry->d_inode)->i_dirty = 1;
137         return retval;
138 }
139
140 const struct file_operations hpfs_file_ops =
141 {
142         .llseek         = generic_file_llseek,
143         .read           = do_sync_read,
144         .aio_read       = generic_file_aio_read,
145         .write          = hpfs_file_write,
146         .aio_write      = generic_file_aio_write,
147         .mmap           = generic_file_mmap,
148         .release        = hpfs_file_release,
149         .fsync          = hpfs_file_fsync,
150         .splice_read    = generic_file_splice_read,
151 };
152
153 const struct inode_operations hpfs_file_iops =
154 {
155         .truncate       = hpfs_truncate,
156         .setattr        = hpfs_setattr,
157 };