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1a59d1b8 | 1 | // SPDX-License-Identifier: GPL-2.0-or-later |
1da177e4 LT |
2 | /* |
3 | * Copyright (C) International Business Machines Corp., 2000-2004 | |
4 | * Portions Copyright (C) Christoph Hellwig, 2001-2002 | |
1da177e4 LT |
5 | */ |
6 | ||
7 | #include <linux/fs.h> | |
8 | #include <linux/mpage.h> | |
9 | #include <linux/buffer_head.h> | |
10 | #include <linux/pagemap.h> | |
11 | #include <linux/quotaops.h> | |
e2e40f2c | 12 | #include <linux/uio.h> |
a9185b41 | 13 | #include <linux/writeback.h> |
1da177e4 | 14 | #include "jfs_incore.h" |
1868f4aa | 15 | #include "jfs_inode.h" |
1da177e4 LT |
16 | #include "jfs_filsys.h" |
17 | #include "jfs_imap.h" | |
18 | #include "jfs_extent.h" | |
19 | #include "jfs_unicode.h" | |
20 | #include "jfs_debug.h" | |
b3b4a6e3 | 21 | #include "jfs_dmap.h" |
1da177e4 LT |
22 | |
23 | ||
eab1df71 | 24 | struct inode *jfs_iget(struct super_block *sb, unsigned long ino) |
1da177e4 | 25 | { |
eab1df71 DH |
26 | struct inode *inode; |
27 | int ret; | |
28 | ||
29 | inode = iget_locked(sb, ino); | |
30 | if (!inode) | |
31 | return ERR_PTR(-ENOMEM); | |
32 | if (!(inode->i_state & I_NEW)) | |
33 | return inode; | |
34 | ||
35 | ret = diRead(inode); | |
36 | if (ret < 0) { | |
37 | iget_failed(inode); | |
38 | return ERR_PTR(ret); | |
1da177e4 LT |
39 | } |
40 | ||
41 | if (S_ISREG(inode->i_mode)) { | |
42 | inode->i_op = &jfs_file_inode_operations; | |
43 | inode->i_fop = &jfs_file_operations; | |
44 | inode->i_mapping->a_ops = &jfs_aops; | |
45 | } else if (S_ISDIR(inode->i_mode)) { | |
46 | inode->i_op = &jfs_dir_inode_operations; | |
47 | inode->i_fop = &jfs_dir_operations; | |
48 | } else if (S_ISLNK(inode->i_mode)) { | |
49 | if (inode->i_size >= IDATASIZE) { | |
50 | inode->i_op = &page_symlink_inode_operations; | |
21fc61c7 | 51 | inode_nohighmem(inode); |
1da177e4 | 52 | inode->i_mapping->a_ops = &jfs_aops; |
d69e83d9 | 53 | } else { |
c7f2e1f0 | 54 | inode->i_op = &jfs_fast_symlink_inode_operations; |
ad476fed | 55 | inode->i_link = JFS_IP(inode)->i_inline; |
d69e83d9 DK |
56 | /* |
57 | * The inline data should be null-terminated, but | |
58 | * don't let on-disk corruption crash the kernel | |
59 | */ | |
ad476fed | 60 | inode->i_link[inode->i_size] = '\0'; |
d69e83d9 | 61 | } |
1da177e4 LT |
62 | } else { |
63 | inode->i_op = &jfs_file_inode_operations; | |
64 | init_special_inode(inode, inode->i_mode, inode->i_rdev); | |
65 | } | |
eab1df71 DH |
66 | unlock_new_inode(inode); |
67 | return inode; | |
1da177e4 LT |
68 | } |
69 | ||
70 | /* | |
71 | * Workhorse of both fsync & write_inode | |
72 | */ | |
73 | int jfs_commit_inode(struct inode *inode, int wait) | |
74 | { | |
75 | int rc = 0; | |
76 | tid_t tid; | |
77 | static int noisy = 5; | |
78 | ||
79 | jfs_info("In jfs_commit_inode, inode = 0x%p", inode); | |
80 | ||
81 | /* | |
82 | * Don't commit if inode has been committed since last being | |
83 | * marked dirty, or if it has been deleted. | |
84 | */ | |
85 | if (inode->i_nlink == 0 || !test_cflag(COMMIT_Dirty, inode)) | |
86 | return 0; | |
87 | ||
88 | if (isReadOnly(inode)) { | |
89 | /* kernel allows writes to devices on read-only | |
90 | * partitions and may think inode is dirty | |
91 | */ | |
92 | if (!special_file(inode->i_mode) && noisy) { | |
6ed71e98 JP |
93 | jfs_err("jfs_commit_inode(0x%p) called on read-only volume", |
94 | inode); | |
1da177e4 LT |
95 | jfs_err("Is remount racy?"); |
96 | noisy--; | |
97 | } | |
98 | return 0; | |
99 | } | |
100 | ||
101 | tid = txBegin(inode->i_sb, COMMIT_INODE); | |
1de87444 | 102 | mutex_lock(&JFS_IP(inode)->commit_mutex); |
1da177e4 LT |
103 | |
104 | /* | |
1de87444 | 105 | * Retest inode state after taking commit_mutex |
1da177e4 LT |
106 | */ |
107 | if (inode->i_nlink && test_cflag(COMMIT_Dirty, inode)) | |
108 | rc = txCommit(tid, 1, &inode, wait ? COMMIT_SYNC : 0); | |
109 | ||
110 | txEnd(tid); | |
1de87444 | 111 | mutex_unlock(&JFS_IP(inode)->commit_mutex); |
1da177e4 LT |
112 | return rc; |
113 | } | |
114 | ||
a9185b41 | 115 | int jfs_write_inode(struct inode *inode, struct writeback_control *wbc) |
1da177e4 | 116 | { |
a9185b41 CH |
117 | int wait = wbc->sync_mode == WB_SYNC_ALL; |
118 | ||
73aaa22d | 119 | if (inode->i_nlink == 0) |
1da177e4 LT |
120 | return 0; |
121 | /* | |
122 | * If COMMIT_DIRTY is not set, the inode isn't really dirty. | |
123 | * It has been committed since the last change, but was still | |
124 | * on the dirty inode list. | |
125 | */ | |
f7f31adf | 126 | if (!test_cflag(COMMIT_Dirty, inode)) { |
1da177e4 LT |
127 | /* Make sure committed changes hit the disk */ |
128 | jfs_flush_journal(JFS_SBI(inode->i_sb)->log, wait); | |
129 | return 0; | |
f7f31adf | 130 | } |
1da177e4 LT |
131 | |
132 | if (jfs_commit_inode(inode, wait)) { | |
133 | jfs_err("jfs_write_inode: jfs_commit_inode failed!"); | |
134 | return -EIO; | |
135 | } else | |
136 | return 0; | |
137 | } | |
138 | ||
62aff86f | 139 | void jfs_evict_inode(struct inode *inode) |
1da177e4 | 140 | { |
b3b4a6e3 AV |
141 | struct jfs_inode_info *ji = JFS_IP(inode); |
142 | ||
62aff86f | 143 | jfs_info("In jfs_evict_inode, inode = 0x%p", inode); |
1da177e4 | 144 | |
62aff86f | 145 | if (!inode->i_nlink && !is_bad_inode(inode)) { |
871a2931 | 146 | dquot_initialize(inode); |
907f4554 | 147 | |
62aff86f | 148 | if (JFS_IP(inode)->fileset == FILESYSTEM_I) { |
a5304629 | 149 | struct inode *ipimap = JFS_SBI(inode->i_sb)->ipimap; |
91b0abe3 | 150 | truncate_inode_pages_final(&inode->i_data); |
fef26658 | 151 | |
62aff86f AV |
152 | if (test_cflag(COMMIT_Freewmap, inode)) |
153 | jfs_free_zero_link(inode); | |
1da177e4 | 154 | |
a5304629 | 155 | if (ipimap && JFS_IP(ipimap)->i_imap) |
9d574f98 | 156 | diFree(inode); |
1da177e4 | 157 | |
62aff86f AV |
158 | /* |
159 | * Free the inode from the quota allocation. | |
160 | */ | |
62aff86f AV |
161 | dquot_free_inode(inode); |
162 | } | |
163 | } else { | |
91b0abe3 | 164 | truncate_inode_pages_final(&inode->i_data); |
b1b5d7f9 | 165 | } |
dbd5768f | 166 | clear_inode(inode); |
62aff86f | 167 | dquot_drop(inode); |
b3b4a6e3 AV |
168 | |
169 | BUG_ON(!list_empty(&ji->anon_inode_list)); | |
170 | ||
171 | spin_lock_irq(&ji->ag_lock); | |
172 | if (ji->active_ag != -1) { | |
173 | struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap; | |
174 | atomic_dec(&bmap->db_active[ji->active_ag]); | |
175 | ji->active_ag = -1; | |
176 | } | |
177 | spin_unlock_irq(&ji->ag_lock); | |
1da177e4 LT |
178 | } |
179 | ||
aa385729 | 180 | void jfs_dirty_inode(struct inode *inode, int flags) |
1da177e4 LT |
181 | { |
182 | static int noisy = 5; | |
183 | ||
184 | if (isReadOnly(inode)) { | |
185 | if (!special_file(inode->i_mode) && noisy) { | |
186 | /* kernel allows writes to devices on read-only | |
187 | * partitions and may try to mark inode dirty | |
188 | */ | |
189 | jfs_err("jfs_dirty_inode called on read-only volume"); | |
190 | jfs_err("Is remount racy?"); | |
191 | noisy--; | |
192 | } | |
193 | return; | |
194 | } | |
195 | ||
196 | set_cflag(COMMIT_Dirty, inode); | |
197 | } | |
198 | ||
115ff50b DK |
199 | int jfs_get_block(struct inode *ip, sector_t lblock, |
200 | struct buffer_head *bh_result, int create) | |
1da177e4 LT |
201 | { |
202 | s64 lblock64 = lblock; | |
203 | int rc = 0; | |
1da177e4 LT |
204 | xad_t xad; |
205 | s64 xaddr; | |
206 | int xflag; | |
115ff50b | 207 | s32 xlen = bh_result->b_size >> ip->i_blkbits; |
1da177e4 | 208 | |
1da177e4 LT |
209 | /* |
210 | * Take appropriate lock on inode | |
211 | */ | |
7fab479b | 212 | if (create) |
82d5b9a7 | 213 | IWRITE_LOCK(ip, RDWRLOCK_NORMAL); |
7fab479b | 214 | else |
82d5b9a7 | 215 | IREAD_LOCK(ip, RDWRLOCK_NORMAL); |
1da177e4 LT |
216 | |
217 | if (((lblock64 << ip->i_sb->s_blocksize_bits) < ip->i_size) && | |
115ff50b | 218 | (!xtLookup(ip, lblock64, xlen, &xflag, &xaddr, &xlen, 0)) && |
6628465e | 219 | xaddr) { |
1da177e4 LT |
220 | if (xflag & XAD_NOTRECORDED) { |
221 | if (!create) | |
222 | /* | |
223 | * Allocated but not recorded, read treats | |
224 | * this as a hole | |
225 | */ | |
226 | goto unlock; | |
1da177e4 LT |
227 | XADoffset(&xad, lblock64); |
228 | XADlength(&xad, xlen); | |
229 | XADaddress(&xad, xaddr); | |
1da177e4 LT |
230 | rc = extRecord(ip, &xad); |
231 | if (rc) | |
232 | goto unlock; | |
233 | set_buffer_new(bh_result); | |
234 | } | |
235 | ||
236 | map_bh(bh_result, ip->i_sb, xaddr); | |
237 | bh_result->b_size = xlen << ip->i_blkbits; | |
238 | goto unlock; | |
239 | } | |
240 | if (!create) | |
241 | goto unlock; | |
242 | ||
243 | /* | |
244 | * Allocate a new block | |
245 | */ | |
1da177e4 LT |
246 | if ((rc = extHint(ip, lblock64 << ip->i_sb->s_blocksize_bits, &xad))) |
247 | goto unlock; | |
4d81715f | 248 | rc = extAlloc(ip, xlen, lblock64, &xad, false); |
1da177e4 LT |
249 | if (rc) |
250 | goto unlock; | |
251 | ||
252 | set_buffer_new(bh_result); | |
253 | map_bh(bh_result, ip->i_sb, addressXAD(&xad)); | |
254 | bh_result->b_size = lengthXAD(&xad) << ip->i_blkbits; | |
255 | ||
1da177e4 LT |
256 | unlock: |
257 | /* | |
258 | * Release lock on inode | |
259 | */ | |
7fab479b DK |
260 | if (create) |
261 | IWRITE_UNLOCK(ip); | |
262 | else | |
263 | IREAD_UNLOCK(ip); | |
1da177e4 LT |
264 | return rc; |
265 | } | |
266 | ||
1da177e4 LT |
267 | static int jfs_writepages(struct address_space *mapping, |
268 | struct writeback_control *wbc) | |
269 | { | |
270 | return mpage_writepages(mapping, wbc, jfs_get_block); | |
271 | } | |
272 | ||
f132ab7d | 273 | static int jfs_read_folio(struct file *file, struct folio *folio) |
1da177e4 | 274 | { |
f132ab7d | 275 | return mpage_read_folio(folio, jfs_get_block); |
1da177e4 LT |
276 | } |
277 | ||
d4388340 | 278 | static void jfs_readahead(struct readahead_control *rac) |
1da177e4 | 279 | { |
d4388340 | 280 | mpage_readahead(rac, jfs_get_block); |
1da177e4 LT |
281 | } |
282 | ||
86dd07d6 MS |
283 | static void jfs_write_failed(struct address_space *mapping, loff_t to) |
284 | { | |
285 | struct inode *inode = mapping->host; | |
286 | ||
287 | if (to > inode->i_size) { | |
7caef267 | 288 | truncate_pagecache(inode, inode->i_size); |
86dd07d6 MS |
289 | jfs_truncate(inode); |
290 | } | |
291 | } | |
292 | ||
d5c5f84b | 293 | static int jfs_write_begin(struct file *file, struct address_space *mapping, |
9d6b0cd7 | 294 | loff_t pos, unsigned len, |
d5c5f84b | 295 | struct page **pagep, void **fsdata) |
1da177e4 | 296 | { |
ea0f04e5 CH |
297 | int ret; |
298 | ||
002cbb13 | 299 | ret = block_write_begin(mapping, pos, len, pagep, jfs_get_block); |
86dd07d6 MS |
300 | if (unlikely(ret)) |
301 | jfs_write_failed(mapping, pos + len); | |
ea0f04e5 CH |
302 | |
303 | return ret; | |
1da177e4 LT |
304 | } |
305 | ||
002cbb13 CH |
306 | static int jfs_write_end(struct file *file, struct address_space *mapping, |
307 | loff_t pos, unsigned len, unsigned copied, struct page *page, | |
308 | void *fsdata) | |
309 | { | |
310 | int ret; | |
311 | ||
312 | ret = generic_write_end(file, mapping, pos, len, copied, page, fsdata); | |
313 | if (ret < len) | |
314 | jfs_write_failed(mapping, pos + len); | |
315 | return ret; | |
316 | } | |
317 | ||
1da177e4 LT |
318 | static sector_t jfs_bmap(struct address_space *mapping, sector_t block) |
319 | { | |
320 | return generic_block_bmap(mapping, block, jfs_get_block); | |
321 | } | |
322 | ||
c8b8e32d | 323 | static ssize_t jfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter) |
1da177e4 LT |
324 | { |
325 | struct file *file = iocb->ki_filp; | |
86dd07d6 | 326 | struct address_space *mapping = file->f_mapping; |
1da177e4 | 327 | struct inode *inode = file->f_mapping->host; |
a6cbcd4a | 328 | size_t count = iov_iter_count(iter); |
eafdc7d1 | 329 | ssize_t ret; |
1da177e4 | 330 | |
c8b8e32d | 331 | ret = blockdev_direct_IO(iocb, inode, iter, jfs_get_block); |
eafdc7d1 CH |
332 | |
333 | /* | |
334 | * In case of error extending write may have instantiated a few | |
335 | * blocks outside i_size. Trim these off again. | |
336 | */ | |
6f673763 | 337 | if (unlikely(iov_iter_rw(iter) == WRITE && ret < 0)) { |
eafdc7d1 | 338 | loff_t isize = i_size_read(inode); |
c8b8e32d | 339 | loff_t end = iocb->ki_pos + count; |
eafdc7d1 CH |
340 | |
341 | if (end > isize) | |
86dd07d6 | 342 | jfs_write_failed(mapping, end); |
eafdc7d1 CH |
343 | } |
344 | ||
345 | return ret; | |
1da177e4 LT |
346 | } |
347 | ||
f5e54d6e | 348 | const struct address_space_operations jfs_aops = { |
e621900a | 349 | .dirty_folio = block_dirty_folio, |
7ba13abb | 350 | .invalidate_folio = block_invalidate_folio, |
f132ab7d | 351 | .read_folio = jfs_read_folio, |
d4388340 | 352 | .readahead = jfs_readahead, |
1da177e4 | 353 | .writepages = jfs_writepages, |
d5c5f84b | 354 | .write_begin = jfs_write_begin, |
002cbb13 | 355 | .write_end = jfs_write_end, |
1da177e4 LT |
356 | .bmap = jfs_bmap, |
357 | .direct_IO = jfs_direct_IO, | |
2274c3b2 | 358 | .migrate_folio = buffer_migrate_folio, |
1da177e4 LT |
359 | }; |
360 | ||
361 | /* | |
362 | * Guts of jfs_truncate. Called with locks already held. Can be called | |
363 | * with directory for truncating directory index table. | |
364 | */ | |
365 | void jfs_truncate_nolock(struct inode *ip, loff_t length) | |
366 | { | |
367 | loff_t newsize; | |
368 | tid_t tid; | |
369 | ||
370 | ASSERT(length >= 0); | |
371 | ||
372 | if (test_cflag(COMMIT_Nolink, ip)) { | |
373 | xtTruncate(0, ip, length, COMMIT_WMAP); | |
374 | return; | |
375 | } | |
376 | ||
377 | do { | |
378 | tid = txBegin(ip->i_sb, 0); | |
379 | ||
380 | /* | |
1de87444 | 381 | * The commit_mutex cannot be taken before txBegin. |
1da177e4 LT |
382 | * txBegin may block and there is a chance the inode |
383 | * could be marked dirty and need to be committed | |
384 | * before txBegin unblocks | |
385 | */ | |
1de87444 | 386 | mutex_lock(&JFS_IP(ip)->commit_mutex); |
1da177e4 LT |
387 | |
388 | newsize = xtTruncate(tid, ip, length, | |
389 | COMMIT_TRUNCATE | COMMIT_PWMAP); | |
390 | if (newsize < 0) { | |
391 | txEnd(tid); | |
1de87444 | 392 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
1da177e4 LT |
393 | break; |
394 | } | |
395 | ||
078cd827 | 396 | ip->i_mtime = ip->i_ctime = current_time(ip); |
1da177e4 LT |
397 | mark_inode_dirty(ip); |
398 | ||
399 | txCommit(tid, 1, &ip, 0); | |
400 | txEnd(tid); | |
1de87444 | 401 | mutex_unlock(&JFS_IP(ip)->commit_mutex); |
1da177e4 LT |
402 | } while (newsize > length); /* Truncate isn't always atomic */ |
403 | } | |
404 | ||
405 | void jfs_truncate(struct inode *ip) | |
406 | { | |
407 | jfs_info("jfs_truncate: size = 0x%lx", (ulong) ip->i_size); | |
408 | ||
002cbb13 | 409 | block_truncate_page(ip->i_mapping, ip->i_size, jfs_get_block); |
1da177e4 | 410 | |
82d5b9a7 | 411 | IWRITE_LOCK(ip, RDWRLOCK_NORMAL); |
1da177e4 LT |
412 | jfs_truncate_nolock(ip, ip->i_size); |
413 | IWRITE_UNLOCK(ip); | |
414 | } |