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Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
13static int hpfs_file_release(struct inode *inode, struct file *file)
14{
Arnd Bergmann9a311b92011-01-22 20:26:12 +010015 hpfs_lock(inode->i_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070016 hpfs_write_if_changed(inode);
Arnd Bergmann9a311b92011-01-22 20:26:12 +010017 hpfs_unlock(inode->i_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070018 return 0;
19}
20
Josef Bacik02c24a82011-07-16 20:44:56 -040021int hpfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync)
Linus Torvalds1da177e2005-04-16 15:20:36 -070022{
Mikulas Patockabc8728e2011-05-08 20:44:19 +020023 struct inode *inode = file->f_mapping->host;
Josef Bacik02c24a82011-07-16 20:44:56 -040024 int ret;
25
26 ret = filemap_write_and_wait_range(file->f_mapping, start, end);
27 if (ret)
28 return ret;
Mikulas Patockabc8728e2011-05-08 20:44:19 +020029 return sync_blockdev(inode->i_sb->s_bdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070030}
31
32/*
33 * generic_file_read often calls bmap with non-existing sector,
34 * so we must ignore such errors.
35 */
36
37static secno hpfs_bmap(struct inode *inode, unsigned file_secno)
38{
39 struct hpfs_inode_info *hpfs_inode = hpfs_i(inode);
40 unsigned n, disk_secno;
41 struct fnode *fnode;
42 struct buffer_head *bh;
43 if (BLOCKS(hpfs_i(inode)->mmu_private) <= file_secno) return 0;
44 n = file_secno - hpfs_inode->i_file_sec;
45 if (n < hpfs_inode->i_n_secs) return hpfs_inode->i_disk_sec + n;
46 if (!(fnode = hpfs_map_fnode(inode->i_sb, inode->i_ino, &bh))) return 0;
47 disk_secno = hpfs_bplus_lookup(inode->i_sb, inode, &fnode->btree, file_secno, bh);
48 if (disk_secno == -1) return 0;
49 if (hpfs_chk_sectors(inode->i_sb, disk_secno, 1, "bmap")) return 0;
50 return disk_secno;
51}
52
Marco Stornelli70b31c42012-12-15 11:53:50 +010053void hpfs_truncate(struct inode *i)
Linus Torvalds1da177e2005-04-16 15:20:36 -070054{
55 if (IS_IMMUTABLE(i)) return /*-EPERM*/;
Mikulas Patocka7dd29d82011-05-08 20:42:54 +020056 hpfs_lock_assert(i->i_sb);
57
Linus Torvalds1da177e2005-04-16 15:20:36 -070058 hpfs_i(i)->i_n_secs = 0;
59 i->i_blocks = 1 + ((i->i_size + 511) >> 9);
60 hpfs_i(i)->mmu_private = i->i_size;
61 hpfs_truncate_btree(i->i_sb, i->i_ino, 1, ((i->i_size + 511) >> 9));
62 hpfs_write_inode(i);
63 hpfs_i(i)->i_n_secs = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070064}
65
66static int hpfs_get_block(struct inode *inode, sector_t iblock, struct buffer_head *bh_result, int create)
67{
Mikulas Patocka7dd29d82011-05-08 20:42:54 +020068 int r;
Linus Torvalds1da177e2005-04-16 15:20:36 -070069 secno s;
Mikulas Patocka7dd29d82011-05-08 20:42:54 +020070 hpfs_lock(inode->i_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 s = hpfs_bmap(inode, iblock);
72 if (s) {
73 map_bh(bh_result, inode->i_sb, s);
Mikulas Patocka7dd29d82011-05-08 20:42:54 +020074 goto ret_0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070075 }
Mikulas Patocka7dd29d82011-05-08 20:42:54 +020076 if (!create) goto ret_0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070077 if (iblock<<9 != hpfs_i(inode)->mmu_private) {
78 BUG();
Mikulas Patocka7dd29d82011-05-08 20:42:54 +020079 r = -EIO;
80 goto ret_r;
Linus Torvalds1da177e2005-04-16 15:20:36 -070081 }
82 if ((s = hpfs_add_sector_to_btree(inode->i_sb, inode->i_ino, 1, inode->i_blocks - 1)) == -1) {
83 hpfs_truncate_btree(inode->i_sb, inode->i_ino, 1, inode->i_blocks - 1);
Mikulas Patocka7dd29d82011-05-08 20:42:54 +020084 r = -ENOSPC;
85 goto ret_r;
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 }
87 inode->i_blocks++;
88 hpfs_i(inode)->mmu_private += 512;
89 set_buffer_new(bh_result);
90 map_bh(bh_result, inode->i_sb, s);
Mikulas Patocka7dd29d82011-05-08 20:42:54 +020091 ret_0:
92 r = 0;
93 ret_r:
94 hpfs_unlock(inode->i_sb);
95 return r;
Linus Torvalds1da177e2005-04-16 15:20:36 -070096}
97
98static int hpfs_writepage(struct page *page, struct writeback_control *wbc)
99{
100 return block_write_full_page(page,hpfs_get_block, wbc);
101}
Nick Piggind6091b72007-10-16 01:25:10 -0700102
Linus Torvalds1da177e2005-04-16 15:20:36 -0700103static int hpfs_readpage(struct file *file, struct page *page)
104{
105 return block_read_full_page(page,hpfs_get_block);
106}
Nick Piggind6091b72007-10-16 01:25:10 -0700107
Marco Stornelli70b31c42012-12-15 11:53:50 +0100108static void hpfs_write_failed(struct address_space *mapping, loff_t to)
109{
110 struct inode *inode = mapping->host;
111
112 if (to > inode->i_size) {
113 truncate_pagecache(inode, to, inode->i_size);
114 hpfs_truncate(inode);
115 }
116}
117
Nick Piggind6091b72007-10-16 01:25:10 -0700118static int hpfs_write_begin(struct file *file, struct address_space *mapping,
119 loff_t pos, unsigned len, unsigned flags,
120 struct page **pagep, void **fsdata)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121{
Christoph Hellwig282dc172010-06-04 11:29:55 +0200122 int ret;
123
Nick Piggind6091b72007-10-16 01:25:10 -0700124 *pagep = NULL;
Christoph Hellwig282dc172010-06-04 11:29:55 +0200125 ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
Nick Piggind6091b72007-10-16 01:25:10 -0700126 hpfs_get_block,
127 &hpfs_i(mapping->host)->mmu_private);
Marco Stornelli70b31c42012-12-15 11:53:50 +0100128 if (unlikely(ret))
129 hpfs_write_failed(mapping, pos + len);
Christoph Hellwig282dc172010-06-04 11:29:55 +0200130
131 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132}
Nick Piggind6091b72007-10-16 01:25:10 -0700133
Linus Torvalds1da177e2005-04-16 15:20:36 -0700134static sector_t _hpfs_bmap(struct address_space *mapping, sector_t block)
135{
136 return generic_block_bmap(mapping,block,hpfs_get_block);
137}
Nick Piggind6091b72007-10-16 01:25:10 -0700138
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700139const struct address_space_operations hpfs_aops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700140 .readpage = hpfs_readpage,
141 .writepage = hpfs_writepage,
Nick Piggind6091b72007-10-16 01:25:10 -0700142 .write_begin = hpfs_write_begin,
143 .write_end = generic_write_end,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700144 .bmap = _hpfs_bmap
145};
146
147static ssize_t hpfs_file_write(struct file *file, const char __user *buf,
148 size_t count, loff_t *ppos)
149{
150 ssize_t retval;
151
Badari Pulavarty543ade12006-09-30 23:28:48 -0700152 retval = do_sync_write(file, buf, count, ppos);
Mikulas Patocka7dd29d82011-05-08 20:42:54 +0200153 if (retval > 0) {
154 hpfs_lock(file->f_path.dentry->d_sb);
Josef Sipek575800b2006-12-08 02:37:06 -0800155 hpfs_i(file->f_path.dentry->d_inode)->i_dirty = 1;
Mikulas Patocka7dd29d82011-05-08 20:42:54 +0200156 hpfs_unlock(file->f_path.dentry->d_sb);
157 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700158 return retval;
159}
160
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800161const struct file_operations hpfs_file_ops =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162{
163 .llseek = generic_file_llseek,
Badari Pulavarty543ade12006-09-30 23:28:48 -0700164 .read = do_sync_read,
165 .aio_read = generic_file_aio_read,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700166 .write = hpfs_file_write,
Badari Pulavarty543ade12006-09-30 23:28:48 -0700167 .aio_write = generic_file_aio_write,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700168 .mmap = generic_file_mmap,
169 .release = hpfs_file_release,
170 .fsync = hpfs_file_fsync,
Jens Axboe5ffc4ef2007-06-01 11:49:19 +0200171 .splice_read = generic_file_splice_read,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700172};
173
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -0800174const struct inode_operations hpfs_file_iops =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700175{
Christoph Hellwigca30bc92008-08-11 00:27:59 +0200176 .setattr = hpfs_setattr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177};