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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 <linux/smp_lock.h> |
10 | #include "hpfs_fn.h" |
11 | |
12 | #define BLOCKS(size) (((size) + 511) >> 9) |
13 | |
14 | static int hpfs_file_release(struct inode *inode, struct file *file) |
15 | { |
16 | lock_kernel(); |
17 | hpfs_write_if_changed(inode); |
18 | unlock_kernel(); |
19 | return 0; |
20 | } |
21 | |
22 | int hpfs_file_fsync(struct file *file, struct dentry *dentry, int datasync) |
23 | { |
24 | /*return file_fsync(file, dentry);*/ |
25 | return 0; /* Don't fsync :-) */ |
26 | } |
27 | |
28 | /* |
29 | * generic_file_read often calls bmap with non-existing sector, |
30 | * so we must ignore such errors. |
31 | */ |
32 | |
33 | static secno hpfs_bmap(struct inode *inode, unsigned file_secno) |
34 | { |
35 | struct hpfs_inode_info *hpfs_inode = hpfs_i(inode); |
36 | unsigned n, disk_secno; |
37 | struct fnode *fnode; |
38 | struct buffer_head *bh; |
39 | if (BLOCKS(hpfs_i(inode)->mmu_private) <= file_secno) return 0; |
40 | n = file_secno - hpfs_inode->i_file_sec; |
41 | if (n < hpfs_inode->i_n_secs) return hpfs_inode->i_disk_sec + n; |
42 | if (!(fnode = hpfs_map_fnode(inode->i_sb, inode->i_ino, &bh))) return 0; |
43 | disk_secno = hpfs_bplus_lookup(inode->i_sb, inode, &fnode->btree, file_secno, bh); |
44 | if (disk_secno == -1) return 0; |
45 | if (hpfs_chk_sectors(inode->i_sb, disk_secno, 1, "bmap")) return 0; |
46 | return disk_secno; |
47 | } |
48 | |
49 | static void hpfs_truncate(struct inode *i) |
50 | { |
51 | if (IS_IMMUTABLE(i)) return /*-EPERM*/; |
52 | lock_kernel(); |
53 | hpfs_i(i)->i_n_secs = 0; |
54 | i->i_blocks = 1 + ((i->i_size + 511) >> 9); |
55 | hpfs_i(i)->mmu_private = i->i_size; |
56 | hpfs_truncate_btree(i->i_sb, i->i_ino, 1, ((i->i_size + 511) >> 9)); |
57 | hpfs_write_inode(i); |
58 | hpfs_i(i)->i_n_secs = 0; |
59 | unlock_kernel(); |
60 | } |
61 | |
62 | static int hpfs_get_block(struct inode *inode, sector_t iblock, struct buffer_head *bh_result, int create) |
63 | { |
64 | secno s; |
65 | s = hpfs_bmap(inode, iblock); |
66 | if (s) { |
67 | map_bh(bh_result, inode->i_sb, s); |
68 | return 0; |
69 | } |
70 | if (!create) return 0; |
71 | if (iblock<<9 != hpfs_i(inode)->mmu_private) { |
72 | BUG(); |
73 | return -EIO; |
74 | } |
75 | if ((s = hpfs_add_sector_to_btree(inode->i_sb, inode->i_ino, 1, inode->i_blocks - 1)) == -1) { |
76 | hpfs_truncate_btree(inode->i_sb, inode->i_ino, 1, inode->i_blocks - 1); |
77 | return -ENOSPC; |
78 | } |
79 | inode->i_blocks++; |
80 | hpfs_i(inode)->mmu_private += 512; |
81 | set_buffer_new(bh_result); |
82 | map_bh(bh_result, inode->i_sb, s); |
83 | return 0; |
84 | } |
85 | |
86 | static int hpfs_writepage(struct page *page, struct writeback_control *wbc) |
87 | { |
88 | return block_write_full_page(page,hpfs_get_block, wbc); |
89 | } |
90 | |
91 | static int hpfs_readpage(struct file *file, struct page *page) |
92 | { |
93 | return block_read_full_page(page,hpfs_get_block); |
94 | } |
95 | |
96 | static int hpfs_write_begin(struct file *file, struct address_space *mapping, |
97 | loff_t pos, unsigned len, unsigned flags, |
98 | struct page **pagep, void **fsdata) |
99 | { |
100 | *pagep = NULL; |
101 | return cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata, |
102 | hpfs_get_block, |
103 | &hpfs_i(mapping->host)->mmu_private); |
104 | } |
105 | |
106 | static sector_t _hpfs_bmap(struct address_space *mapping, sector_t block) |
107 | { |
108 | return generic_block_bmap(mapping,block,hpfs_get_block); |
109 | } |
110 | |
111 | const struct address_space_operations hpfs_aops = { |
112 | .readpage = hpfs_readpage, |
113 | .writepage = hpfs_writepage, |
114 | .sync_page = block_sync_page, |
115 | .write_begin = hpfs_write_begin, |
116 | .write_end = generic_write_end, |
117 | .bmap = _hpfs_bmap |
118 | }; |
119 | |
120 | static ssize_t hpfs_file_write(struct file *file, const char __user *buf, |
121 | size_t count, loff_t *ppos) |
122 | { |
123 | ssize_t retval; |
124 | |
125 | retval = do_sync_write(file, buf, count, ppos); |
126 | if (retval > 0) |
127 | hpfs_i(file->f_path.dentry->d_inode)->i_dirty = 1; |
128 | return retval; |
129 | } |
130 | |
131 | const struct file_operations hpfs_file_ops = |
132 | { |
133 | .llseek = generic_file_llseek, |
134 | .read = do_sync_read, |
135 | .aio_read = generic_file_aio_read, |
136 | .write = hpfs_file_write, |
137 | .aio_write = generic_file_aio_write, |
138 | .mmap = generic_file_mmap, |
139 | .release = hpfs_file_release, |
140 | .fsync = hpfs_file_fsync, |
141 | .splice_read = generic_file_splice_read, |
142 | }; |
143 | |
144 | const struct inode_operations hpfs_file_iops = |
145 | { |
146 | .truncate = hpfs_truncate, |
147 | .setattr = hpfs_setattr, |
148 | }; |
149 |
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