Commit | Line | Data |
---|---|---|
b2441318 | 1 | // SPDX-License-Identifier: GPL-2.0 |
1da177e4 LT |
2 | /* |
3 | * linux/fs/hpfs/file.c | |
4 | * | |
5 | * Mikulas Patocka (mikulas@artax.karlin.mff.cuni.cz), 1998-1999 | |
6 | * | |
7 | * file VFS functions | |
8 | */ | |
9 | ||
10 | #include "hpfs_fn.h" | |
a0c1b759 | 11 | #include <linux/mpage.h> |
e0cba89d | 12 | #include <linux/iomap.h> |
10c5db28 | 13 | #include <linux/fiemap.h> |
1da177e4 LT |
14 | |
15 | #define BLOCKS(size) (((size) + 511) >> 9) | |
16 | ||
17 | static int hpfs_file_release(struct inode *inode, struct file *file) | |
18 | { | |
9a311b96 | 19 | hpfs_lock(inode->i_sb); |
1da177e4 | 20 | hpfs_write_if_changed(inode); |
9a311b96 | 21 | hpfs_unlock(inode->i_sb); |
1da177e4 LT |
22 | return 0; |
23 | } | |
24 | ||
02c24a82 | 25 | int hpfs_file_fsync(struct file *file, loff_t start, loff_t end, int datasync) |
1da177e4 | 26 | { |
bc8728ee | 27 | struct inode *inode = file->f_mapping->host; |
02c24a82 JB |
28 | int ret; |
29 | ||
3b49c9a1 | 30 | ret = file_write_and_wait_range(file, start, end); |
02c24a82 JB |
31 | if (ret) |
32 | return ret; | |
bc8728ee | 33 | return sync_blockdev(inode->i_sb->s_bdev); |
1da177e4 LT |
34 | } |
35 | ||
36 | /* | |
37 | * generic_file_read often calls bmap with non-existing sector, | |
38 | * so we must ignore such errors. | |
39 | */ | |
40 | ||
a0c1b759 | 41 | static secno hpfs_bmap(struct inode *inode, unsigned file_secno, unsigned *n_secs) |
1da177e4 LT |
42 | { |
43 | struct hpfs_inode_info *hpfs_inode = hpfs_i(inode); | |
44 | unsigned n, disk_secno; | |
45 | struct fnode *fnode; | |
46 | struct buffer_head *bh; | |
47 | if (BLOCKS(hpfs_i(inode)->mmu_private) <= file_secno) return 0; | |
48 | n = file_secno - hpfs_inode->i_file_sec; | |
a0c1b759 MP |
49 | if (n < hpfs_inode->i_n_secs) { |
50 | *n_secs = hpfs_inode->i_n_secs - n; | |
51 | return hpfs_inode->i_disk_sec + n; | |
52 | } | |
1da177e4 LT |
53 | if (!(fnode = hpfs_map_fnode(inode->i_sb, inode->i_ino, &bh))) return 0; |
54 | disk_secno = hpfs_bplus_lookup(inode->i_sb, inode, &fnode->btree, file_secno, bh); | |
55 | if (disk_secno == -1) return 0; | |
56 | if (hpfs_chk_sectors(inode->i_sb, disk_secno, 1, "bmap")) return 0; | |
a0c1b759 MP |
57 | n = file_secno - hpfs_inode->i_file_sec; |
58 | if (n < hpfs_inode->i_n_secs) { | |
59 | *n_secs = hpfs_inode->i_n_secs - n; | |
60 | return hpfs_inode->i_disk_sec + n; | |
61 | } | |
62 | *n_secs = 1; | |
1da177e4 LT |
63 | return disk_secno; |
64 | } | |
65 | ||
70b31c4c | 66 | void hpfs_truncate(struct inode *i) |
1da177e4 LT |
67 | { |
68 | if (IS_IMMUTABLE(i)) return /*-EPERM*/; | |
7dd29d8d MP |
69 | hpfs_lock_assert(i->i_sb); |
70 | ||
1da177e4 LT |
71 | hpfs_i(i)->i_n_secs = 0; |
72 | i->i_blocks = 1 + ((i->i_size + 511) >> 9); | |
73 | hpfs_i(i)->mmu_private = i->i_size; | |
74 | hpfs_truncate_btree(i->i_sb, i->i_ino, 1, ((i->i_size + 511) >> 9)); | |
75 | hpfs_write_inode(i); | |
76 | hpfs_i(i)->i_n_secs = 0; | |
1da177e4 LT |
77 | } |
78 | ||
79 | static int hpfs_get_block(struct inode *inode, sector_t iblock, struct buffer_head *bh_result, int create) | |
80 | { | |
7dd29d8d | 81 | int r; |
1da177e4 | 82 | secno s; |
a0c1b759 | 83 | unsigned n_secs; |
7dd29d8d | 84 | hpfs_lock(inode->i_sb); |
a0c1b759 | 85 | s = hpfs_bmap(inode, iblock, &n_secs); |
1da177e4 | 86 | if (s) { |
a0c1b759 MP |
87 | if (bh_result->b_size >> 9 < n_secs) |
88 | n_secs = bh_result->b_size >> 9; | |
a64eefaa MP |
89 | n_secs = hpfs_search_hotfix_map_for_range(inode->i_sb, s, n_secs); |
90 | if (unlikely(!n_secs)) { | |
91 | s = hpfs_search_hotfix_map(inode->i_sb, s); | |
92 | n_secs = 1; | |
93 | } | |
1da177e4 | 94 | map_bh(bh_result, inode->i_sb, s); |
a0c1b759 | 95 | bh_result->b_size = n_secs << 9; |
7dd29d8d | 96 | goto ret_0; |
1da177e4 | 97 | } |
7dd29d8d | 98 | if (!create) goto ret_0; |
1da177e4 LT |
99 | if (iblock<<9 != hpfs_i(inode)->mmu_private) { |
100 | BUG(); | |
7dd29d8d MP |
101 | r = -EIO; |
102 | goto ret_r; | |
1da177e4 LT |
103 | } |
104 | if ((s = hpfs_add_sector_to_btree(inode->i_sb, inode->i_ino, 1, inode->i_blocks - 1)) == -1) { | |
105 | hpfs_truncate_btree(inode->i_sb, inode->i_ino, 1, inode->i_blocks - 1); | |
7dd29d8d MP |
106 | r = -ENOSPC; |
107 | goto ret_r; | |
1da177e4 LT |
108 | } |
109 | inode->i_blocks++; | |
110 | hpfs_i(inode)->mmu_private += 512; | |
111 | set_buffer_new(bh_result); | |
a64eefaa | 112 | map_bh(bh_result, inode->i_sb, hpfs_search_hotfix_map(inode->i_sb, s)); |
7dd29d8d MP |
113 | ret_0: |
114 | r = 0; | |
115 | ret_r: | |
116 | hpfs_unlock(inode->i_sb); | |
117 | return r; | |
1da177e4 LT |
118 | } |
119 | ||
e0cba89d CH |
120 | static int hpfs_iomap_begin(struct inode *inode, loff_t offset, loff_t length, |
121 | unsigned flags, struct iomap *iomap, struct iomap *srcmap) | |
122 | { | |
123 | struct super_block *sb = inode->i_sb; | |
124 | unsigned int blkbits = inode->i_blkbits; | |
125 | unsigned int n_secs; | |
126 | secno s; | |
127 | ||
128 | if (WARN_ON_ONCE(flags & (IOMAP_WRITE | IOMAP_ZERO))) | |
129 | return -EINVAL; | |
130 | ||
131 | iomap->bdev = inode->i_sb->s_bdev; | |
132 | iomap->offset = offset; | |
133 | ||
134 | hpfs_lock(sb); | |
135 | s = hpfs_bmap(inode, offset >> blkbits, &n_secs); | |
136 | if (s) { | |
137 | n_secs = hpfs_search_hotfix_map_for_range(sb, s, | |
138 | min_t(loff_t, n_secs, length)); | |
139 | if (unlikely(!n_secs)) { | |
140 | s = hpfs_search_hotfix_map(sb, s); | |
141 | n_secs = 1; | |
142 | } | |
143 | iomap->type = IOMAP_MAPPED; | |
144 | iomap->flags = IOMAP_F_MERGED; | |
145 | iomap->addr = (u64)s << blkbits; | |
146 | iomap->length = (u64)n_secs << blkbits; | |
147 | } else { | |
148 | iomap->type = IOMAP_HOLE; | |
149 | iomap->addr = IOMAP_NULL_ADDR; | |
150 | iomap->length = 1 << blkbits; | |
151 | } | |
152 | ||
153 | hpfs_unlock(sb); | |
154 | return 0; | |
155 | } | |
156 | ||
157 | static const struct iomap_ops hpfs_iomap_ops = { | |
158 | .iomap_begin = hpfs_iomap_begin, | |
159 | }; | |
160 | ||
a0c1b759 MP |
161 | static int hpfs_readpage(struct file *file, struct page *page) |
162 | { | |
163 | return mpage_readpage(page, hpfs_get_block); | |
164 | } | |
165 | ||
1da177e4 LT |
166 | static int hpfs_writepage(struct page *page, struct writeback_control *wbc) |
167 | { | |
a0c1b759 | 168 | return block_write_full_page(page, hpfs_get_block, wbc); |
1da177e4 | 169 | } |
d6091b72 | 170 | |
d4388340 | 171 | static void hpfs_readahead(struct readahead_control *rac) |
a0c1b759 | 172 | { |
d4388340 | 173 | mpage_readahead(rac, hpfs_get_block); |
a0c1b759 MP |
174 | } |
175 | ||
176 | static int hpfs_writepages(struct address_space *mapping, | |
177 | struct writeback_control *wbc) | |
1da177e4 | 178 | { |
a0c1b759 | 179 | return mpage_writepages(mapping, wbc, hpfs_get_block); |
1da177e4 | 180 | } |
d6091b72 | 181 | |
70b31c4c MS |
182 | static void hpfs_write_failed(struct address_space *mapping, loff_t to) |
183 | { | |
184 | struct inode *inode = mapping->host; | |
185 | ||
bbd465df MP |
186 | hpfs_lock(inode->i_sb); |
187 | ||
70b31c4c | 188 | if (to > inode->i_size) { |
7caef267 | 189 | truncate_pagecache(inode, inode->i_size); |
70b31c4c MS |
190 | hpfs_truncate(inode); |
191 | } | |
bbd465df MP |
192 | |
193 | hpfs_unlock(inode->i_sb); | |
70b31c4c MS |
194 | } |
195 | ||
d6091b72 NP |
196 | static int hpfs_write_begin(struct file *file, struct address_space *mapping, |
197 | loff_t pos, unsigned len, unsigned flags, | |
198 | struct page **pagep, void **fsdata) | |
1da177e4 | 199 | { |
282dc178 CH |
200 | int ret; |
201 | ||
d6091b72 | 202 | *pagep = NULL; |
282dc178 | 203 | ret = cont_write_begin(file, mapping, pos, len, flags, pagep, fsdata, |
d6091b72 NP |
204 | hpfs_get_block, |
205 | &hpfs_i(mapping->host)->mmu_private); | |
70b31c4c MS |
206 | if (unlikely(ret)) |
207 | hpfs_write_failed(mapping, pos + len); | |
282dc178 CH |
208 | |
209 | return ret; | |
1da177e4 | 210 | } |
d6091b72 | 211 | |
5f2e354f AV |
212 | static int hpfs_write_end(struct file *file, struct address_space *mapping, |
213 | loff_t pos, unsigned len, unsigned copied, | |
214 | struct page *pagep, void *fsdata) | |
215 | { | |
216 | struct inode *inode = mapping->host; | |
217 | int err; | |
218 | err = generic_write_end(file, mapping, pos, len, copied, pagep, fsdata); | |
219 | if (err < len) | |
220 | hpfs_write_failed(mapping, pos + len); | |
221 | if (!(err < 0)) { | |
222 | /* make sure we write it on close, if not earlier */ | |
223 | hpfs_lock(inode->i_sb); | |
224 | hpfs_i(inode)->i_dirty = 1; | |
225 | hpfs_unlock(inode->i_sb); | |
226 | } | |
227 | return err; | |
228 | } | |
229 | ||
1da177e4 LT |
230 | static sector_t _hpfs_bmap(struct address_space *mapping, sector_t block) |
231 | { | |
a64eefaa | 232 | return generic_block_bmap(mapping, block, hpfs_get_block); |
1da177e4 | 233 | } |
d6091b72 | 234 | |
91fff9b3 MP |
235 | static int hpfs_fiemap(struct inode *inode, struct fiemap_extent_info *fieinfo, u64 start, u64 len) |
236 | { | |
e0cba89d CH |
237 | int ret; |
238 | ||
239 | inode_lock(inode); | |
240 | len = min_t(u64, len, i_size_read(inode)); | |
241 | ret = iomap_fiemap(inode, fieinfo, start, len, &hpfs_iomap_ops); | |
242 | inode_unlock(inode); | |
243 | ||
244 | return ret; | |
91fff9b3 MP |
245 | } |
246 | ||
f5e54d6e | 247 | const struct address_space_operations hpfs_aops = { |
0af57378 | 248 | .set_page_dirty = __set_page_dirty_buffers, |
1da177e4 LT |
249 | .readpage = hpfs_readpage, |
250 | .writepage = hpfs_writepage, | |
d4388340 | 251 | .readahead = hpfs_readahead, |
a0c1b759 | 252 | .writepages = hpfs_writepages, |
d6091b72 | 253 | .write_begin = hpfs_write_begin, |
5f2e354f | 254 | .write_end = hpfs_write_end, |
1da177e4 LT |
255 | .bmap = _hpfs_bmap |
256 | }; | |
257 | ||
4b6f5d20 | 258 | const struct file_operations hpfs_file_ops = |
1da177e4 LT |
259 | { |
260 | .llseek = generic_file_llseek, | |
aad4f8bb | 261 | .read_iter = generic_file_read_iter, |
8174202b | 262 | .write_iter = generic_file_write_iter, |
1da177e4 LT |
263 | .mmap = generic_file_mmap, |
264 | .release = hpfs_file_release, | |
265 | .fsync = hpfs_file_fsync, | |
5ffc4ef4 | 266 | .splice_read = generic_file_splice_read, |
a27b5b97 | 267 | .unlocked_ioctl = hpfs_ioctl, |
314999dc | 268 | .compat_ioctl = compat_ptr_ioctl, |
1da177e4 LT |
269 | }; |
270 | ||
92e1d5be | 271 | const struct inode_operations hpfs_file_iops = |
1da177e4 | 272 | { |
ca30bc99 | 273 | .setattr = hpfs_setattr, |
91fff9b3 | 274 | .fiemap = hpfs_fiemap, |
1da177e4 | 275 | }; |