]> git.proxmox.com Git - mirror_ubuntu-bionic-kernel.git/blob - fs/jfs/inode.c
Merge git://git.kernel.org/pub/scm/linux/kernel/git/davem/net
[mirror_ubuntu-bionic-kernel.git] / fs / jfs / inode.c
1 /*
2 * Copyright (C) International Business Machines Corp., 2000-2004
3 * Portions Copyright (C) Christoph Hellwig, 2001-2002
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License as published by
7 * the Free Software Foundation; either version 2 of the License, or
8 * (at your option) any later version.
9 *
10 * This program is distributed in the hope that it will be useful,
11 * but WITHOUT ANY WARRANTY; without even the implied warranty of
12 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See
13 * the GNU General Public License for more details.
14 *
15 * You should have received a copy of the GNU General Public License
16 * along with this program; if not, write to the Free Software
17 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
18 */
19
20 #include <linux/fs.h>
21 #include <linux/mpage.h>
22 #include <linux/buffer_head.h>
23 #include <linux/pagemap.h>
24 #include <linux/quotaops.h>
25 #include <linux/uio.h>
26 #include <linux/writeback.h>
27 #include "jfs_incore.h"
28 #include "jfs_inode.h"
29 #include "jfs_filsys.h"
30 #include "jfs_imap.h"
31 #include "jfs_extent.h"
32 #include "jfs_unicode.h"
33 #include "jfs_debug.h"
34
35
36 struct inode *jfs_iget(struct super_block *sb, unsigned long ino)
37 {
38 struct inode *inode;
39 int ret;
40
41 inode = iget_locked(sb, ino);
42 if (!inode)
43 return ERR_PTR(-ENOMEM);
44 if (!(inode->i_state & I_NEW))
45 return inode;
46
47 ret = diRead(inode);
48 if (ret < 0) {
49 iget_failed(inode);
50 return ERR_PTR(ret);
51 }
52
53 if (S_ISREG(inode->i_mode)) {
54 inode->i_op = &jfs_file_inode_operations;
55 inode->i_fop = &jfs_file_operations;
56 inode->i_mapping->a_ops = &jfs_aops;
57 } else if (S_ISDIR(inode->i_mode)) {
58 inode->i_op = &jfs_dir_inode_operations;
59 inode->i_fop = &jfs_dir_operations;
60 } else if (S_ISLNK(inode->i_mode)) {
61 if (inode->i_size >= IDATASIZE) {
62 inode->i_op = &page_symlink_inode_operations;
63 inode_nohighmem(inode);
64 inode->i_mapping->a_ops = &jfs_aops;
65 } else {
66 inode->i_op = &jfs_fast_symlink_inode_operations;
67 inode->i_link = JFS_IP(inode)->i_inline;
68 /*
69 * The inline data should be null-terminated, but
70 * don't let on-disk corruption crash the kernel
71 */
72 inode->i_link[inode->i_size] = '\0';
73 }
74 } else {
75 inode->i_op = &jfs_file_inode_operations;
76 init_special_inode(inode, inode->i_mode, inode->i_rdev);
77 }
78 unlock_new_inode(inode);
79 return inode;
80 }
81
82 /*
83 * Workhorse of both fsync & write_inode
84 */
85 int jfs_commit_inode(struct inode *inode, int wait)
86 {
87 int rc = 0;
88 tid_t tid;
89 static int noisy = 5;
90
91 jfs_info("In jfs_commit_inode, inode = 0x%p", inode);
92
93 /*
94 * Don't commit if inode has been committed since last being
95 * marked dirty, or if it has been deleted.
96 */
97 if (inode->i_nlink == 0 || !test_cflag(COMMIT_Dirty, inode))
98 return 0;
99
100 if (isReadOnly(inode)) {
101 /* kernel allows writes to devices on read-only
102 * partitions and may think inode is dirty
103 */
104 if (!special_file(inode->i_mode) && noisy) {
105 jfs_err("jfs_commit_inode(0x%p) called on "
106 "read-only volume", inode);
107 jfs_err("Is remount racy?");
108 noisy--;
109 }
110 return 0;
111 }
112
113 tid = txBegin(inode->i_sb, COMMIT_INODE);
114 mutex_lock(&JFS_IP(inode)->commit_mutex);
115
116 /*
117 * Retest inode state after taking commit_mutex
118 */
119 if (inode->i_nlink && test_cflag(COMMIT_Dirty, inode))
120 rc = txCommit(tid, 1, &inode, wait ? COMMIT_SYNC : 0);
121
122 txEnd(tid);
123 mutex_unlock(&JFS_IP(inode)->commit_mutex);
124 return rc;
125 }
126
127 int jfs_write_inode(struct inode *inode, struct writeback_control *wbc)
128 {
129 int wait = wbc->sync_mode == WB_SYNC_ALL;
130
131 if (inode->i_nlink == 0)
132 return 0;
133 /*
134 * If COMMIT_DIRTY is not set, the inode isn't really dirty.
135 * It has been committed since the last change, but was still
136 * on the dirty inode list.
137 */
138 if (!test_cflag(COMMIT_Dirty, inode)) {
139 /* Make sure committed changes hit the disk */
140 jfs_flush_journal(JFS_SBI(inode->i_sb)->log, wait);
141 return 0;
142 }
143
144 if (jfs_commit_inode(inode, wait)) {
145 jfs_err("jfs_write_inode: jfs_commit_inode failed!");
146 return -EIO;
147 } else
148 return 0;
149 }
150
151 void jfs_evict_inode(struct inode *inode)
152 {
153 jfs_info("In jfs_evict_inode, inode = 0x%p", inode);
154
155 if (!inode->i_nlink && !is_bad_inode(inode)) {
156 dquot_initialize(inode);
157
158 if (JFS_IP(inode)->fileset == FILESYSTEM_I) {
159 truncate_inode_pages_final(&inode->i_data);
160
161 if (test_cflag(COMMIT_Freewmap, inode))
162 jfs_free_zero_link(inode);
163
164 diFree(inode);
165
166 /*
167 * Free the inode from the quota allocation.
168 */
169 dquot_initialize(inode);
170 dquot_free_inode(inode);
171 }
172 } else {
173 truncate_inode_pages_final(&inode->i_data);
174 }
175 clear_inode(inode);
176 dquot_drop(inode);
177 }
178
179 void jfs_dirty_inode(struct inode *inode, int flags)
180 {
181 static int noisy = 5;
182
183 if (isReadOnly(inode)) {
184 if (!special_file(inode->i_mode) && noisy) {
185 /* kernel allows writes to devices on read-only
186 * partitions and may try to mark inode dirty
187 */
188 jfs_err("jfs_dirty_inode called on read-only volume");
189 jfs_err("Is remount racy?");
190 noisy--;
191 }
192 return;
193 }
194
195 set_cflag(COMMIT_Dirty, inode);
196 }
197
198 int jfs_get_block(struct inode *ip, sector_t lblock,
199 struct buffer_head *bh_result, int create)
200 {
201 s64 lblock64 = lblock;
202 int rc = 0;
203 xad_t xad;
204 s64 xaddr;
205 int xflag;
206 s32 xlen = bh_result->b_size >> ip->i_blkbits;
207
208 /*
209 * Take appropriate lock on inode
210 */
211 if (create)
212 IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
213 else
214 IREAD_LOCK(ip, RDWRLOCK_NORMAL);
215
216 if (((lblock64 << ip->i_sb->s_blocksize_bits) < ip->i_size) &&
217 (!xtLookup(ip, lblock64, xlen, &xflag, &xaddr, &xlen, 0)) &&
218 xaddr) {
219 if (xflag & XAD_NOTRECORDED) {
220 if (!create)
221 /*
222 * Allocated but not recorded, read treats
223 * this as a hole
224 */
225 goto unlock;
226 #ifdef _JFS_4K
227 XADoffset(&xad, lblock64);
228 XADlength(&xad, xlen);
229 XADaddress(&xad, xaddr);
230 #else /* _JFS_4K */
231 /*
232 * As long as block size = 4K, this isn't a problem.
233 * We should mark the whole page not ABNR, but how
234 * will we know to mark the other blocks BH_New?
235 */
236 BUG();
237 #endif /* _JFS_4K */
238 rc = extRecord(ip, &xad);
239 if (rc)
240 goto unlock;
241 set_buffer_new(bh_result);
242 }
243
244 map_bh(bh_result, ip->i_sb, xaddr);
245 bh_result->b_size = xlen << ip->i_blkbits;
246 goto unlock;
247 }
248 if (!create)
249 goto unlock;
250
251 /*
252 * Allocate a new block
253 */
254 #ifdef _JFS_4K
255 if ((rc = extHint(ip, lblock64 << ip->i_sb->s_blocksize_bits, &xad)))
256 goto unlock;
257 rc = extAlloc(ip, xlen, lblock64, &xad, false);
258 if (rc)
259 goto unlock;
260
261 set_buffer_new(bh_result);
262 map_bh(bh_result, ip->i_sb, addressXAD(&xad));
263 bh_result->b_size = lengthXAD(&xad) << ip->i_blkbits;
264
265 #else /* _JFS_4K */
266 /*
267 * We need to do whatever it takes to keep all but the last buffers
268 * in 4K pages - see jfs_write.c
269 */
270 BUG();
271 #endif /* _JFS_4K */
272
273 unlock:
274 /*
275 * Release lock on inode
276 */
277 if (create)
278 IWRITE_UNLOCK(ip);
279 else
280 IREAD_UNLOCK(ip);
281 return rc;
282 }
283
284 static int jfs_writepage(struct page *page, struct writeback_control *wbc)
285 {
286 return block_write_full_page(page, jfs_get_block, wbc);
287 }
288
289 static int jfs_writepages(struct address_space *mapping,
290 struct writeback_control *wbc)
291 {
292 return mpage_writepages(mapping, wbc, jfs_get_block);
293 }
294
295 static int jfs_readpage(struct file *file, struct page *page)
296 {
297 return mpage_readpage(page, jfs_get_block);
298 }
299
300 static int jfs_readpages(struct file *file, struct address_space *mapping,
301 struct list_head *pages, unsigned nr_pages)
302 {
303 return mpage_readpages(mapping, pages, nr_pages, jfs_get_block);
304 }
305
306 static void jfs_write_failed(struct address_space *mapping, loff_t to)
307 {
308 struct inode *inode = mapping->host;
309
310 if (to > inode->i_size) {
311 truncate_pagecache(inode, inode->i_size);
312 jfs_truncate(inode);
313 }
314 }
315
316 static int jfs_write_begin(struct file *file, struct address_space *mapping,
317 loff_t pos, unsigned len, unsigned flags,
318 struct page **pagep, void **fsdata)
319 {
320 int ret;
321
322 ret = nobh_write_begin(mapping, pos, len, flags, pagep, fsdata,
323 jfs_get_block);
324 if (unlikely(ret))
325 jfs_write_failed(mapping, pos + len);
326
327 return ret;
328 }
329
330 static sector_t jfs_bmap(struct address_space *mapping, sector_t block)
331 {
332 return generic_block_bmap(mapping, block, jfs_get_block);
333 }
334
335 static ssize_t jfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter,
336 loff_t offset)
337 {
338 struct file *file = iocb->ki_filp;
339 struct address_space *mapping = file->f_mapping;
340 struct inode *inode = file->f_mapping->host;
341 size_t count = iov_iter_count(iter);
342 ssize_t ret;
343
344 ret = blockdev_direct_IO(iocb, inode, iter, offset, jfs_get_block);
345
346 /*
347 * In case of error extending write may have instantiated a few
348 * blocks outside i_size. Trim these off again.
349 */
350 if (unlikely(iov_iter_rw(iter) == WRITE && ret < 0)) {
351 loff_t isize = i_size_read(inode);
352 loff_t end = offset + count;
353
354 if (end > isize)
355 jfs_write_failed(mapping, end);
356 }
357
358 return ret;
359 }
360
361 const struct address_space_operations jfs_aops = {
362 .readpage = jfs_readpage,
363 .readpages = jfs_readpages,
364 .writepage = jfs_writepage,
365 .writepages = jfs_writepages,
366 .write_begin = jfs_write_begin,
367 .write_end = nobh_write_end,
368 .bmap = jfs_bmap,
369 .direct_IO = jfs_direct_IO,
370 };
371
372 /*
373 * Guts of jfs_truncate. Called with locks already held. Can be called
374 * with directory for truncating directory index table.
375 */
376 void jfs_truncate_nolock(struct inode *ip, loff_t length)
377 {
378 loff_t newsize;
379 tid_t tid;
380
381 ASSERT(length >= 0);
382
383 if (test_cflag(COMMIT_Nolink, ip)) {
384 xtTruncate(0, ip, length, COMMIT_WMAP);
385 return;
386 }
387
388 do {
389 tid = txBegin(ip->i_sb, 0);
390
391 /*
392 * The commit_mutex cannot be taken before txBegin.
393 * txBegin may block and there is a chance the inode
394 * could be marked dirty and need to be committed
395 * before txBegin unblocks
396 */
397 mutex_lock(&JFS_IP(ip)->commit_mutex);
398
399 newsize = xtTruncate(tid, ip, length,
400 COMMIT_TRUNCATE | COMMIT_PWMAP);
401 if (newsize < 0) {
402 txEnd(tid);
403 mutex_unlock(&JFS_IP(ip)->commit_mutex);
404 break;
405 }
406
407 ip->i_mtime = ip->i_ctime = CURRENT_TIME;
408 mark_inode_dirty(ip);
409
410 txCommit(tid, 1, &ip, 0);
411 txEnd(tid);
412 mutex_unlock(&JFS_IP(ip)->commit_mutex);
413 } while (newsize > length); /* Truncate isn't always atomic */
414 }
415
416 void jfs_truncate(struct inode *ip)
417 {
418 jfs_info("jfs_truncate: size = 0x%lx", (ulong) ip->i_size);
419
420 nobh_truncate_page(ip->i_mapping, ip->i_size, jfs_get_block);
421
422 IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
423 jfs_truncate_nolock(ip, ip->i_size);
424 IWRITE_UNLOCK(ip);
425 }