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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 "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 | hpfs_lock(inode->i_sb); |
16 | hpfs_write_if_changed(inode); |
17 | hpfs_unlock(inode->i_sb); |
18 | return 0; |
19 | } |
20 | |
21 | int hpfs_file_fsync(struct file *file, int datasync) |
22 | { |
23 | struct inode *inode = file->f_mapping->host; |
24 | return sync_blockdev(inode->i_sb->s_bdev); |
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 | hpfs_lock_assert(i->i_sb); |
52 | |
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 | } |
60 | |
61 | static int hpfs_get_block(struct inode *inode, sector_t iblock, struct buffer_head *bh_result, int create) |
62 | { |
63 | int r; |
64 | secno s; |
65 | hpfs_lock(inode->i_sb); |
66 | s = hpfs_bmap(inode, iblock); |
67 | if (s) { |
68 | map_bh(bh_result, inode->i_sb, s); |
69 | goto ret_0; |
70 | } |
71 | if (!create) goto ret_0; |
72 | if (iblock<<9 != hpfs_i(inode)->mmu_private) { |
73 | BUG(); |
74 | r = -EIO; |
75 | goto ret_r; |
76 | } |
77 | if ((s = hpfs_add_sector_to_btree(inode->i_sb, inode->i_ino, 1, inode->i_blocks - 1)) == -1) { |
78 | hpfs_truncate_btree(inode->i_sb, inode->i_ino, 1, inode->i_blocks - 1); |
79 | r = -ENOSPC; |
80 | goto ret_r; |
81 | } |
82 | inode->i_blocks++; |
83 | hpfs_i(inode)->mmu_private += 512; |
84 | set_buffer_new(bh_result); |
85 | map_bh(bh_result, inode->i_sb, s); |
86 | ret_0: |
87 | r = 0; |
88 | ret_r: |
89 | hpfs_unlock(inode->i_sb); |
90 | return r; |
91 | } |
92 | |
93 | static int hpfs_writepage(struct page *page, struct writeback_control *wbc) |
94 | { |
95 | return block_write_full_page(page,hpfs_get_block, wbc); |
96 | } |
97 | |
98 | static int hpfs_readpage(struct file *file, struct page *page) |
99 | { |
100 | return block_read_full_page(page,hpfs_get_block); |
101 | } |
102 | |
103 | static int hpfs_write_begin(struct file *file, struct address_space *mapping, |
104 | loff_t pos, unsigned len, unsigned flags, |
105 | struct page **pagep, void **fsdata) |
106 | { |
107 | int ret; |
108 | |
109 | *pagep = NULL; |
110 | ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata, |
111 | hpfs_get_block, |
112 | &hpfs_i(mapping->host)->mmu_private); |
113 | if (unlikely(ret)) { |
114 | loff_t isize = mapping->host->i_size; |
115 | if (pos + len > isize) |
116 | vmtruncate(mapping->host, isize); |
117 | } |
118 | |
119 | return ret; |
120 | } |
121 | |
122 | static sector_t _hpfs_bmap(struct address_space *mapping, sector_t block) |
123 | { |
124 | return generic_block_bmap(mapping,block,hpfs_get_block); |
125 | } |
126 | |
127 | const struct address_space_operations hpfs_aops = { |
128 | .readpage = hpfs_readpage, |
129 | .writepage = hpfs_writepage, |
130 | .write_begin = hpfs_write_begin, |
131 | .write_end = generic_write_end, |
132 | .bmap = _hpfs_bmap |
133 | }; |
134 | |
135 | static ssize_t hpfs_file_write(struct file *file, const char __user *buf, |
136 | size_t count, loff_t *ppos) |
137 | { |
138 | ssize_t retval; |
139 | |
140 | retval = do_sync_write(file, buf, count, ppos); |
141 | if (retval > 0) { |
142 | hpfs_lock(file->f_path.dentry->d_sb); |
143 | hpfs_i(file->f_path.dentry->d_inode)->i_dirty = 1; |
144 | hpfs_unlock(file->f_path.dentry->d_sb); |
145 | } |
146 | return retval; |
147 | } |
148 | |
149 | const struct file_operations hpfs_file_ops = |
150 | { |
151 | .llseek = generic_file_llseek, |
152 | .read = do_sync_read, |
153 | .aio_read = generic_file_aio_read, |
154 | .write = hpfs_file_write, |
155 | .aio_write = generic_file_aio_write, |
156 | .mmap = generic_file_mmap, |
157 | .release = hpfs_file_release, |
158 | .fsync = hpfs_file_fsync, |
159 | .splice_read = generic_file_splice_read, |
160 | }; |
161 | |
162 | const struct inode_operations hpfs_file_iops = |
163 | { |
164 | .truncate = hpfs_truncate, |
165 | .setattr = hpfs_setattr, |
166 | }; |
167 |
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