Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/cjb/mmc
[cris-mirror.git] / fs / hpfs / file.c
blob9b9eb6933e43d8620a38ec744f77d4d8712e3b9a
1 /*
2 * linux/fs/hpfs/file.c
4 * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999
6 * file VFS functions
7 */
9 #include "hpfs_fn.h"
11 #define BLOCKS(size) (((size) + 511) >> 9)
13 static int hpfs_file_release(struct inode *inode, struct file *file)
15 hpfs_lock(inode->i_sb);
16 hpfs_write_if_changed(inode);
17 hpfs_unlock(inode->i_sb);
18 return 0;
21 int hpfs_file_fsync(struct file *file, int datasync)
23 /*return file_fsync(file, datasync);*/
24 return 0; /* Don't fsync :-) */
28 * generic_file_read often calls bmap with non-existing sector,
29 * so we must ignore such errors.
32 static secno hpfs_bmap(struct inode *inode, unsigned file_secno)
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;
48 static void hpfs_truncate(struct inode *i)
50 if (IS_IMMUTABLE(i)) return /*-EPERM*/;
51 hpfs_lock(i->i_sb);
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 hpfs_unlock(i->i_sb);
61 static int hpfs_get_block(struct inode *inode, sector_t iblock, struct buffer_head *bh_result, int create)
63 secno s;
64 s = hpfs_bmap(inode, iblock);
65 if (s) {
66 map_bh(bh_result, inode->i_sb, s);
67 return 0;
69 if (!create) return 0;
70 if (iblock<<9 != hpfs_i(inode)->mmu_private) {
71 BUG();
72 return -EIO;
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;
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;
85 static int hpfs_writepage(struct page *page, struct writeback_control *wbc)
87 return block_write_full_page(page,hpfs_get_block, wbc);
90 static int hpfs_readpage(struct file *file, struct page *page)
92 return block_read_full_page(page,hpfs_get_block);
95 static 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)
99 int ret;
101 *pagep = NULL;
102 ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
103 hpfs_get_block,
104 &hpfs_i(mapping->host)->mmu_private);
105 if (unlikely(ret)) {
106 loff_t isize = mapping->host->i_size;
107 if (pos + len > isize)
108 vmtruncate(mapping->host, isize);
111 return ret;
114 static sector_t _hpfs_bmap(struct address_space *mapping, sector_t block)
116 return generic_block_bmap(mapping,block,hpfs_get_block);
119 const struct address_space_operations hpfs_aops = {
120 .readpage = hpfs_readpage,
121 .writepage = hpfs_writepage,
122 .write_begin = hpfs_write_begin,
123 .write_end = generic_write_end,
124 .bmap = _hpfs_bmap
127 static ssize_t hpfs_file_write(struct file *file, const char __user *buf,
128 size_t count, loff_t *ppos)
130 ssize_t retval;
132 retval = do_sync_write(file, buf, count, ppos);
133 if (retval > 0)
134 hpfs_i(file->f_path.dentry->d_inode)->i_dirty = 1;
135 return retval;
138 const struct file_operations hpfs_file_ops =
140 .llseek = generic_file_llseek,
141 .read = do_sync_read,
142 .aio_read = generic_file_aio_read,
143 .write = hpfs_file_write,
144 .aio_write = generic_file_aio_write,
145 .mmap = generic_file_mmap,
146 .release = hpfs_file_release,
147 .fsync = hpfs_file_fsync,
148 .splice_read = generic_file_splice_read,
151 const struct inode_operations hpfs_file_iops =
153 .truncate = hpfs_truncate,
154 .setattr = hpfs_setattr,