sendfile: remove .sendfile from filesystems that use generic_file_sendfile()
[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 "hpfs_fn.h"
10
11 #define BLOCKS(size) (((size) + 511) >> 9)
12
13 static 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
21 int hpfs_file_fsync(struct file *file, struct dentry *dentry, int datasync)
22 {
23         /*return file_fsync(file, dentry);*/
24         return 0; /* Don't fsync :-) */
25 }
26
27 /*
28  * generic_file_read often calls bmap with non-existing sector,
29  * so we must ignore such errors.
30  */
31
32 static 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
48 static void hpfs_truncate(struct inode *i)
49 {
50         if (IS_IMMUTABLE(i)) return /*-EPERM*/;
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
61 static 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
85 static int hpfs_writepage(struct page *page, struct writeback_control *wbc)
86 {
87         return block_write_full_page(page,hpfs_get_block, wbc);
88 }
89 static int hpfs_readpage(struct file *file, struct page *page)
90 {
91         return block_read_full_page(page,hpfs_get_block);
92 }
93 static int hpfs_prepare_write(struct file *file, struct page *page, unsigned from, unsigned to)
94 {
95         return cont_prepare_write(page,from,to,hpfs_get_block,
96                 &hpfs_i(page->mapping->host)->mmu_private);
97 }
98 static sector_t _hpfs_bmap(struct address_space *mapping, sector_t block)
99 {
100         return generic_block_bmap(mapping,block,hpfs_get_block);
101 }
102 const struct address_space_operations hpfs_aops = {
103         .readpage = hpfs_readpage,
104         .writepage = hpfs_writepage,
105         .sync_page = block_sync_page,
106         .prepare_write = hpfs_prepare_write,
107         .commit_write = generic_commit_write,
108         .bmap = _hpfs_bmap
109 };
110
111 static ssize_t hpfs_file_write(struct file *file, const char __user *buf,
112                         size_t count, loff_t *ppos)
113 {
114         ssize_t retval;
115
116         retval = do_sync_write(file, buf, count, ppos);
117         if (retval > 0)
118                 hpfs_i(file->f_path.dentry->d_inode)->i_dirty = 1;
119         return retval;
120 }
121
122 const struct file_operations hpfs_file_ops =
123 {
124         .llseek         = generic_file_llseek,
125         .read           = do_sync_read,
126         .aio_read       = generic_file_aio_read,
127         .write          = hpfs_file_write,
128         .aio_write      = generic_file_aio_write,
129         .mmap           = generic_file_mmap,
130         .release        = hpfs_file_release,
131         .fsync          = hpfs_file_fsync,
132         .splice_read    = generic_file_splice_read,
133 };
134
135 const struct inode_operations hpfs_file_iops =
136 {
137         .truncate       = hpfs_truncate,
138         .setattr        = hpfs_notify_change,
139 };