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Commit | Line | Data |
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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 | } | |
d6091b72 | 89 | |
1da177e4 LT |
90 | static int hpfs_readpage(struct file *file, struct page *page) |
91 | { | |
92 | return block_read_full_page(page,hpfs_get_block); | |
93 | } | |
d6091b72 NP |
94 | |
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) | |
1da177e4 | 98 | { |
d6091b72 NP |
99 | *pagep = NULL; |
100 | return cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata, | |
101 | hpfs_get_block, | |
102 | &hpfs_i(mapping->host)->mmu_private); | |
1da177e4 | 103 | } |
d6091b72 | 104 | |
1da177e4 LT |
105 | static sector_t _hpfs_bmap(struct address_space *mapping, sector_t block) |
106 | { | |
107 | return generic_block_bmap(mapping,block,hpfs_get_block); | |
108 | } | |
d6091b72 | 109 | |
f5e54d6e | 110 | const struct address_space_operations hpfs_aops = { |
1da177e4 LT |
111 | .readpage = hpfs_readpage, |
112 | .writepage = hpfs_writepage, | |
113 | .sync_page = block_sync_page, | |
d6091b72 NP |
114 | .write_begin = hpfs_write_begin, |
115 | .write_end = generic_write_end, | |
1da177e4 LT |
116 | .bmap = _hpfs_bmap |
117 | }; | |
118 | ||
119 | static ssize_t hpfs_file_write(struct file *file, const char __user *buf, | |
120 | size_t count, loff_t *ppos) | |
121 | { | |
122 | ssize_t retval; | |
123 | ||
543ade1f | 124 | retval = do_sync_write(file, buf, count, ppos); |
33096b1e | 125 | if (retval > 0) |
575800b3 | 126 | hpfs_i(file->f_path.dentry->d_inode)->i_dirty = 1; |
1da177e4 LT |
127 | return retval; |
128 | } | |
129 | ||
4b6f5d20 | 130 | const struct file_operations hpfs_file_ops = |
1da177e4 LT |
131 | { |
132 | .llseek = generic_file_llseek, | |
543ade1f BP |
133 | .read = do_sync_read, |
134 | .aio_read = generic_file_aio_read, | |
1da177e4 | 135 | .write = hpfs_file_write, |
543ade1f | 136 | .aio_write = generic_file_aio_write, |
1da177e4 LT |
137 | .mmap = generic_file_mmap, |
138 | .release = hpfs_file_release, | |
139 | .fsync = hpfs_file_fsync, | |
5ffc4ef4 | 140 | .splice_read = generic_file_splice_read, |
1da177e4 LT |
141 | }; |
142 | ||
92e1d5be | 143 | const struct inode_operations hpfs_file_iops = |
1da177e4 LT |
144 | { |
145 | .truncate = hpfs_truncate, | |
ca30bc99 | 146 | .setattr = hpfs_setattr, |
1da177e4 | 147 | }; |