Commit | Line | Data |
---|---|---|
1da177e4 LT |
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 | 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 = generic_file_write(file, buf, count, ppos); | |
117 | if (retval > 0) { | |
118 | struct inode *inode = file->f_dentry->d_inode; | |
119 | inode->i_mtime = CURRENT_TIME_SEC; | |
120 | hpfs_i(inode)->i_dirty = 1; | |
121 | } | |
122 | return retval; | |
123 | } | |
124 | ||
125 | struct file_operations hpfs_file_ops = | |
126 | { | |
127 | .llseek = generic_file_llseek, | |
128 | .read = generic_file_read, | |
129 | .write = hpfs_file_write, | |
130 | .mmap = generic_file_mmap, | |
131 | .release = hpfs_file_release, | |
132 | .fsync = hpfs_file_fsync, | |
133 | .sendfile = generic_file_sendfile, | |
134 | }; | |
135 | ||
136 | struct inode_operations hpfs_file_iops = | |
137 | { | |
138 | .truncate = hpfs_truncate, | |
139 | .setattr = hpfs_notify_change, | |
140 | }; |