blob: bacb478a49907857d7dcd44c10e01c50f708a6e7 [file] [log] [blame]
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"
Mikulas Patockaa0c1b752013-07-04 18:44:27 +020010#include <linux/mpage.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070011
12#define BLOCKS(size) (((size) + 511) >> 9)
13
14static int hpfs_file_release(struct inode *inode, struct file *file)
15{
Arnd Bergmann9a311b92011-01-22 20:26:12 +010016 hpfs_lock(inode->i_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 hpfs_write_if_changed(inode);
Arnd Bergmann9a311b92011-01-22 20:26:12 +010018 hpfs_unlock(inode->i_sb);
Linus Torvalds1da177e2005-04-16 15:20:36 -070019 return 0;
20}
21
Josef Bacik02c24a82011-07-16 20:44:56 -040022int hpfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync)
Linus Torvalds1da177e2005-04-16 15:20:36 -070023{
Mikulas Patockabc8728e2011-05-08 20:44:19 +020024 struct inode *inode = file->f_mapping->host;
Josef Bacik02c24a82011-07-16 20:44:56 -040025 int ret;
26
27 ret = filemap_write_and_wait_range(file->f_mapping, start, end);
28 if (ret)
29 return ret;
Mikulas Patockabc8728e2011-05-08 20:44:19 +020030 return sync_blockdev(inode->i_sb->s_bdev);
Linus Torvalds1da177e2005-04-16 15:20:36 -070031}
32
33/*
34 * generic_file_read often calls bmap with non-existing sector,
35 * so we must ignore such errors.
36 */
37
Mikulas Patockaa0c1b752013-07-04 18:44:27 +020038static secno hpfs_bmap(struct inode *inode, unsigned file_secno, unsigned *n_secs)
Linus Torvalds1da177e2005-04-16 15:20:36 -070039{
40 struct hpfs_inode_info *hpfs_inode = hpfs_i(inode);
41 unsigned n, disk_secno;
42 struct fnode *fnode;
43 struct buffer_head *bh;
44 if (BLOCKS(hpfs_i(inode)->mmu_private) <= file_secno) return 0;
45 n = file_secno - hpfs_inode->i_file_sec;
Mikulas Patockaa0c1b752013-07-04 18:44:27 +020046 if (n < hpfs_inode->i_n_secs) {
47 *n_secs = hpfs_inode->i_n_secs - n;
48 return hpfs_inode->i_disk_sec + n;
49 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070050 if (!(fnode = hpfs_map_fnode(inode->i_sb, inode->i_ino, &bh))) return 0;
51 disk_secno = hpfs_bplus_lookup(inode->i_sb, inode, &fnode->btree, file_secno, bh);
52 if (disk_secno == -1) return 0;
53 if (hpfs_chk_sectors(inode->i_sb, disk_secno, 1, "bmap")) return 0;
Mikulas Patockaa0c1b752013-07-04 18:44:27 +020054 n = file_secno - hpfs_inode->i_file_sec;
55 if (n < hpfs_inode->i_n_secs) {
56 *n_secs = hpfs_inode->i_n_secs - n;
57 return hpfs_inode->i_disk_sec + n;
58 }
59 *n_secs = 1;
Linus Torvalds1da177e2005-04-16 15:20:36 -070060 return disk_secno;
61}
62
Marco Stornelli70b31c42012-12-15 11:53:50 +010063void hpfs_truncate(struct inode *i)
Linus Torvalds1da177e2005-04-16 15:20:36 -070064{
65 if (IS_IMMUTABLE(i)) return /*-EPERM*/;
Mikulas Patocka7dd29d82011-05-08 20:42:54 +020066 hpfs_lock_assert(i->i_sb);
67
Linus Torvalds1da177e2005-04-16 15:20:36 -070068 hpfs_i(i)->i_n_secs = 0;
69 i->i_blocks = 1 + ((i->i_size + 511) >> 9);
70 hpfs_i(i)->mmu_private = i->i_size;
71 hpfs_truncate_btree(i->i_sb, i->i_ino, 1, ((i->i_size + 511) >> 9));
72 hpfs_write_inode(i);
73 hpfs_i(i)->i_n_secs = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070074}
75
76static int hpfs_get_block(struct inode *inode, sector_t iblock, struct buffer_head *bh_result, int create)
77{
Mikulas Patocka7dd29d82011-05-08 20:42:54 +020078 int r;
Linus Torvalds1da177e2005-04-16 15:20:36 -070079 secno s;
Mikulas Patockaa0c1b752013-07-04 18:44:27 +020080 unsigned n_secs;
Mikulas Patocka7dd29d82011-05-08 20:42:54 +020081 hpfs_lock(inode->i_sb);
Mikulas Patockaa0c1b752013-07-04 18:44:27 +020082 s = hpfs_bmap(inode, iblock, &n_secs);
Linus Torvalds1da177e2005-04-16 15:20:36 -070083 if (s) {
Mikulas Patockaa0c1b752013-07-04 18:44:27 +020084 if (bh_result->b_size >> 9 < n_secs)
85 n_secs = bh_result->b_size >> 9;
Linus Torvalds1da177e2005-04-16 15:20:36 -070086 map_bh(bh_result, inode->i_sb, s);
Mikulas Patockaa0c1b752013-07-04 18:44:27 +020087 bh_result->b_size = n_secs << 9;
Mikulas Patocka7dd29d82011-05-08 20:42:54 +020088 goto ret_0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070089 }
Mikulas Patocka7dd29d82011-05-08 20:42:54 +020090 if (!create) goto ret_0;
Linus Torvalds1da177e2005-04-16 15:20:36 -070091 if (iblock<<9 != hpfs_i(inode)->mmu_private) {
92 BUG();
Mikulas Patocka7dd29d82011-05-08 20:42:54 +020093 r = -EIO;
94 goto ret_r;
Linus Torvalds1da177e2005-04-16 15:20:36 -070095 }
96 if ((s = hpfs_add_sector_to_btree(inode->i_sb, inode->i_ino, 1, inode->i_blocks - 1)) == -1) {
97 hpfs_truncate_btree(inode->i_sb, inode->i_ino, 1, inode->i_blocks - 1);
Mikulas Patocka7dd29d82011-05-08 20:42:54 +020098 r = -ENOSPC;
99 goto ret_r;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700100 }
101 inode->i_blocks++;
102 hpfs_i(inode)->mmu_private += 512;
103 set_buffer_new(bh_result);
104 map_bh(bh_result, inode->i_sb, s);
Mikulas Patocka7dd29d82011-05-08 20:42:54 +0200105 ret_0:
106 r = 0;
107 ret_r:
108 hpfs_unlock(inode->i_sb);
109 return r;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700110}
111
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112static int hpfs_readpage(struct file *file, struct page *page)
113{
Mikulas Patockaa0c1b752013-07-04 18:44:27 +0200114 return mpage_readpage(page, hpfs_get_block);
115}
116
117static int hpfs_writepage(struct page *page, struct writeback_control *wbc)
118{
119 return block_write_full_page(page, hpfs_get_block, wbc);
120}
121
122static int hpfs_readpages(struct file *file, struct address_space *mapping,
123 struct list_head *pages, unsigned nr_pages)
124{
125 return mpage_readpages(mapping, pages, nr_pages, hpfs_get_block);
126}
127
128static int hpfs_writepages(struct address_space *mapping,
129 struct writeback_control *wbc)
130{
131 return mpage_writepages(mapping, wbc, hpfs_get_block);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132}
Nick Piggind6091b72007-10-16 01:25:10 -0700133
Marco Stornelli70b31c42012-12-15 11:53:50 +0100134static void hpfs_write_failed(struct address_space *mapping, loff_t to)
135{
136 struct inode *inode = mapping->host;
137
Mikulas Patockabbd465d2013-06-09 01:25:57 +0200138 hpfs_lock(inode->i_sb);
139
Marco Stornelli70b31c42012-12-15 11:53:50 +0100140 if (to > inode->i_size) {
Kirill A. Shutemov7caef262013-09-12 15:13:56 -0700141 truncate_pagecache(inode, inode->i_size);
Marco Stornelli70b31c42012-12-15 11:53:50 +0100142 hpfs_truncate(inode);
143 }
Mikulas Patockabbd465d2013-06-09 01:25:57 +0200144
145 hpfs_unlock(inode->i_sb);
Marco Stornelli70b31c42012-12-15 11:53:50 +0100146}
147
Nick Piggind6091b72007-10-16 01:25:10 -0700148static int hpfs_write_begin(struct file *file, struct address_space *mapping,
149 loff_t pos, unsigned len, unsigned flags,
150 struct page **pagep, void **fsdata)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151{
Christoph Hellwig282dc172010-06-04 11:29:55 +0200152 int ret;
153
Nick Piggind6091b72007-10-16 01:25:10 -0700154 *pagep = NULL;
Christoph Hellwig282dc172010-06-04 11:29:55 +0200155 ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata,
Nick Piggind6091b72007-10-16 01:25:10 -0700156 hpfs_get_block,
157 &hpfs_i(mapping->host)->mmu_private);
Marco Stornelli70b31c42012-12-15 11:53:50 +0100158 if (unlikely(ret))
159 hpfs_write_failed(mapping, pos + len);
Christoph Hellwig282dc172010-06-04 11:29:55 +0200160
161 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700162}
Nick Piggind6091b72007-10-16 01:25:10 -0700163
Al Viro5f2e3542013-03-19 20:35:00 -0400164static int hpfs_write_end(struct file *file, struct address_space *mapping,
165 loff_t pos, unsigned len, unsigned copied,
166 struct page *pagep, void *fsdata)
167{
168 struct inode *inode = mapping->host;
169 int err;
170 err = generic_write_end(file, mapping, pos, len, copied, pagep, fsdata);
171 if (err < len)
172 hpfs_write_failed(mapping, pos + len);
173 if (!(err < 0)) {
174 /* make sure we write it on close, if not earlier */
175 hpfs_lock(inode->i_sb);
176 hpfs_i(inode)->i_dirty = 1;
177 hpfs_unlock(inode->i_sb);
178 }
179 return err;
180}
181
Linus Torvalds1da177e2005-04-16 15:20:36 -0700182static sector_t _hpfs_bmap(struct address_space *mapping, sector_t block)
183{
184 return generic_block_bmap(mapping,block,hpfs_get_block);
185}
Nick Piggind6091b72007-10-16 01:25:10 -0700186
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700187const struct address_space_operations hpfs_aops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700188 .readpage = hpfs_readpage,
189 .writepage = hpfs_writepage,
Mikulas Patockaa0c1b752013-07-04 18:44:27 +0200190 .readpages = hpfs_readpages,
191 .writepages = hpfs_writepages,
Nick Piggind6091b72007-10-16 01:25:10 -0700192 .write_begin = hpfs_write_begin,
Al Viro5f2e3542013-03-19 20:35:00 -0400193 .write_end = hpfs_write_end,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700194 .bmap = _hpfs_bmap
195};
196
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -0800197const struct file_operations hpfs_file_ops =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700198{
199 .llseek = generic_file_llseek,
Al Viroaad4f8b2014-04-02 14:33:16 -0400200 .read = new_sync_read,
201 .read_iter = generic_file_read_iter,
Al Viro5f2e3542013-03-19 20:35:00 -0400202 .write = do_sync_write,
Badari Pulavarty543ade12006-09-30 23:28:48 -0700203 .aio_write = generic_file_aio_write,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204 .mmap = generic_file_mmap,
205 .release = hpfs_file_release,
206 .fsync = hpfs_file_fsync,
Jens Axboe5ffc4ef2007-06-01 11:49:19 +0200207 .splice_read = generic_file_splice_read,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700208};
209
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -0800210const struct inode_operations hpfs_file_iops =
Linus Torvalds1da177e2005-04-16 15:20:36 -0700211{
Christoph Hellwigca30bc92008-08-11 00:27:59 +0200212 .setattr = hpfs_setattr,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700213};