blob: 9d9bae63ae2a2d44b36c4b1bcd53adae2158e896 [file] [log] [blame]
Linus Torvalds1da177e2005-04-16 15:20:36 -07001/*
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
Dave Kleikamp63f83c92006-10-02 09:55:27 -05007 * the Free Software Foundation; either version 2 of the License, or
Linus Torvalds1da177e2005-04-16 15:20:36 -07008 * (at your option) any later version.
Dave Kleikamp63f83c92006-10-02 09:55:27 -05009 *
Linus Torvalds1da177e2005-04-16 15:20:36 -070010 * 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
Dave Kleikamp63f83c92006-10-02 09:55:27 -050016 * along with this program; if not, write to the Free Software
Linus Torvalds1da177e2005-04-16 15:20:36 -070017 * 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>
Christoph Hellwige2e40f22015-02-22 08:58:50 -080025#include <linux/uio.h>
Christoph Hellwiga9185b42010-03-05 09:21:37 +010026#include <linux/writeback.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070027#include "jfs_incore.h"
Dave Kleikamp1868f4a2005-05-04 15:29:35 -050028#include "jfs_inode.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070029#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
David Howellseab1df72008-02-07 00:15:43 -080036struct inode *jfs_iget(struct super_block *sb, unsigned long ino)
Linus Torvalds1da177e2005-04-16 15:20:36 -070037{
David Howellseab1df72008-02-07 00:15:43 -080038 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);
Linus Torvalds1da177e2005-04-16 15:20:36 -070051 }
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;
Al Viro21fc61c2015-11-17 01:07:57 -050063 inode_nohighmem(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -070064 inode->i_mapping->a_ops = &jfs_aops;
Dave Kleikampd69e83d2008-12-16 10:21:34 -060065 } else {
Dmitry Monakhovc7f2e1f2010-04-16 08:05:50 -050066 inode->i_op = &jfs_fast_symlink_inode_operations;
Al Viroad476fe2015-05-02 10:41:20 -040067 inode->i_link = JFS_IP(inode)->i_inline;
Dave Kleikampd69e83d2008-12-16 10:21:34 -060068 /*
69 * The inline data should be null-terminated, but
70 * don't let on-disk corruption crash the kernel
71 */
Al Viroad476fe2015-05-02 10:41:20 -040072 inode->i_link[inode->i_size] = '\0';
Dave Kleikampd69e83d2008-12-16 10:21:34 -060073 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070074 } else {
75 inode->i_op = &jfs_file_inode_operations;
76 init_special_inode(inode, inode->i_mode, inode->i_rdev);
77 }
David Howellseab1df72008-02-07 00:15:43 -080078 unlock_new_inode(inode);
79 return inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -070080}
81
82/*
83 * Workhorse of both fsync & write_inode
84 */
85int 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);
Ingo Molnar1de87442006-01-24 15:22:50 -0600114 mutex_lock(&JFS_IP(inode)->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115
116 /*
Ingo Molnar1de87442006-01-24 15:22:50 -0600117 * Retest inode state after taking commit_mutex
Linus Torvalds1da177e2005-04-16 15:20:36 -0700118 */
119 if (inode->i_nlink && test_cflag(COMMIT_Dirty, inode))
120 rc = txCommit(tid, 1, &inode, wait ? COMMIT_SYNC : 0);
121
122 txEnd(tid);
Ingo Molnar1de87442006-01-24 15:22:50 -0600123 mutex_unlock(&JFS_IP(inode)->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700124 return rc;
125}
126
Christoph Hellwiga9185b42010-03-05 09:21:37 +0100127int jfs_write_inode(struct inode *inode, struct writeback_control *wbc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128{
Christoph Hellwiga9185b42010-03-05 09:21:37 +0100129 int wait = wbc->sync_mode == WB_SYNC_ALL;
130
Dave Kleikamp73aaa222013-05-01 11:08:38 -0500131 if (inode->i_nlink == 0)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700132 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 */
Colin Ian Kingf7f31ad2015-06-04 17:57:03 +0100138 if (!test_cflag(COMMIT_Dirty, inode)) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700139 /* Make sure committed changes hit the disk */
140 jfs_flush_journal(JFS_SBI(inode->i_sb)->log, wait);
141 return 0;
Colin Ian Kingf7f31ad2015-06-04 17:57:03 +0100142 }
Linus Torvalds1da177e2005-04-16 15:20:36 -0700143
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
Al Viro62aff862010-06-07 00:28:54 -0400151void jfs_evict_inode(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700152{
Al Viro62aff862010-06-07 00:28:54 -0400153 jfs_info("In jfs_evict_inode, inode = 0x%p", inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700154
Al Viro62aff862010-06-07 00:28:54 -0400155 if (!inode->i_nlink && !is_bad_inode(inode)) {
Christoph Hellwig871a2932010-03-03 09:05:07 -0500156 dquot_initialize(inode);
Christoph Hellwig907f4552010-03-03 09:05:06 -0500157
Al Viro62aff862010-06-07 00:28:54 -0400158 if (JFS_IP(inode)->fileset == FILESYSTEM_I) {
Johannes Weiner91b0abe2014-04-03 14:47:49 -0700159 truncate_inode_pages_final(&inode->i_data);
Al Viro62aff862010-06-07 00:28:54 -0400160
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 {
Johannes Weiner91b0abe2014-04-03 14:47:49 -0700173 truncate_inode_pages_final(&inode->i_data);
Dave Kleikampb1b5d7f2005-08-30 14:28:56 -0500174 }
Jan Karadbd57682012-05-03 14:48:02 +0200175 clear_inode(inode);
Al Viro62aff862010-06-07 00:28:54 -0400176 dquot_drop(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177}
178
Christoph Hellwigaa385722011-05-27 06:53:02 -0400179void jfs_dirty_inode(struct inode *inode, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700180{
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
Dave Kleikamp115ff502006-07-26 14:52:13 -0500198int jfs_get_block(struct inode *ip, sector_t lblock,
199 struct buffer_head *bh_result, int create)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200{
201 s64 lblock64 = lblock;
202 int rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700203 xad_t xad;
204 s64 xaddr;
205 int xflag;
Dave Kleikamp115ff502006-07-26 14:52:13 -0500206 s32 xlen = bh_result->b_size >> ip->i_blkbits;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700207
208 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700209 * Take appropriate lock on inode
210 */
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600211 if (create)
Dave Kleikamp82d5b9a2007-01-09 14:14:48 -0600212 IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600213 else
Dave Kleikamp82d5b9a2007-01-09 14:14:48 -0600214 IREAD_LOCK(ip, RDWRLOCK_NORMAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700215
216 if (((lblock64 << ip->i_sb->s_blocksize_bits) < ip->i_size) &&
Dave Kleikamp115ff502006-07-26 14:52:13 -0500217 (!xtLookup(ip, lblock64, xlen, &xflag, &xaddr, &xlen, 0)) &&
Dave Kleikamp66284652005-05-02 12:25:13 -0600218 xaddr) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700219 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;
Richard Knutsson4d817152006-09-30 23:27:14 -0700257 rc = extAlloc(ip, xlen, lblock64, &xad, false);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700258 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 */
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600277 if (create)
278 IWRITE_UNLOCK(ip);
279 else
280 IREAD_UNLOCK(ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281 return rc;
282}
283
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284static int jfs_writepage(struct page *page, struct writeback_control *wbc)
285{
Nick Piggind5c5f842007-10-16 01:25:22 -0700286 return block_write_full_page(page, jfs_get_block, wbc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700287}
288
289static int jfs_writepages(struct address_space *mapping,
290 struct writeback_control *wbc)
291{
292 return mpage_writepages(mapping, wbc, jfs_get_block);
293}
294
295static int jfs_readpage(struct file *file, struct page *page)
296{
297 return mpage_readpage(page, jfs_get_block);
298}
299
300static 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
Marco Stornelli86dd07d2012-12-15 11:54:25 +0100306static 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) {
Kirill A. Shutemov7caef262013-09-12 15:13:56 -0700311 truncate_pagecache(inode, inode->i_size);
Marco Stornelli86dd07d2012-12-15 11:54:25 +0100312 jfs_truncate(inode);
313 }
314}
315
Nick Piggind5c5f842007-10-16 01:25:22 -0700316static 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)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700319{
Christoph Hellwigea0f04e2010-06-04 11:29:54 +0200320 int ret;
321
322 ret = nobh_write_begin(mapping, pos, len, flags, pagep, fsdata,
Nick Piggind5c5f842007-10-16 01:25:22 -0700323 jfs_get_block);
Marco Stornelli86dd07d2012-12-15 11:54:25 +0100324 if (unlikely(ret))
325 jfs_write_failed(mapping, pos + len);
Christoph Hellwigea0f04e2010-06-04 11:29:54 +0200326
327 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700328}
329
330static sector_t jfs_bmap(struct address_space *mapping, sector_t block)
331{
332 return generic_block_bmap(mapping, block, jfs_get_block);
333}
334
Omar Sandoval22c61862015-03-16 04:33:53 -0700335static ssize_t jfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter,
336 loff_t offset)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700337{
338 struct file *file = iocb->ki_filp;
Marco Stornelli86dd07d2012-12-15 11:54:25 +0100339 struct address_space *mapping = file->f_mapping;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700340 struct inode *inode = file->f_mapping->host;
Al Viroa6cbcd42014-03-04 22:38:00 -0500341 size_t count = iov_iter_count(iter);
Christoph Hellwigeafdc7d2010-06-04 11:29:53 +0200342 ssize_t ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700343
Omar Sandoval17f8c842015-03-16 04:33:50 -0700344 ret = blockdev_direct_IO(iocb, inode, iter, offset, jfs_get_block);
Christoph Hellwigeafdc7d2010-06-04 11:29:53 +0200345
346 /*
347 * In case of error extending write may have instantiated a few
348 * blocks outside i_size. Trim these off again.
349 */
Omar Sandoval6f673762015-03-16 04:33:52 -0700350 if (unlikely(iov_iter_rw(iter) == WRITE && ret < 0)) {
Christoph Hellwigeafdc7d2010-06-04 11:29:53 +0200351 loff_t isize = i_size_read(inode);
Al Viroa6cbcd42014-03-04 22:38:00 -0500352 loff_t end = offset + count;
Christoph Hellwigeafdc7d2010-06-04 11:29:53 +0200353
354 if (end > isize)
Marco Stornelli86dd07d2012-12-15 11:54:25 +0100355 jfs_write_failed(mapping, end);
Christoph Hellwigeafdc7d2010-06-04 11:29:53 +0200356 }
357
358 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700359}
360
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700361const struct address_space_operations jfs_aops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700362 .readpage = jfs_readpage,
363 .readpages = jfs_readpages,
364 .writepage = jfs_writepage,
365 .writepages = jfs_writepages,
Nick Piggind5c5f842007-10-16 01:25:22 -0700366 .write_begin = jfs_write_begin,
Nick Piggin03158cd2007-10-16 01:25:25 -0700367 .write_end = nobh_write_end,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700368 .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 */
376void 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 /*
Ingo Molnar1de87442006-01-24 15:22:50 -0600392 * The commit_mutex cannot be taken before txBegin.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 * 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 */
Ingo Molnar1de87442006-01-24 15:22:50 -0600397 mutex_lock(&JFS_IP(ip)->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700398
399 newsize = xtTruncate(tid, ip, length,
400 COMMIT_TRUNCATE | COMMIT_PWMAP);
401 if (newsize < 0) {
402 txEnd(tid);
Ingo Molnar1de87442006-01-24 15:22:50 -0600403 mutex_unlock(&JFS_IP(ip)->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700404 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);
Ingo Molnar1de87442006-01-24 15:22:50 -0600412 mutex_unlock(&JFS_IP(ip)->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700413 } while (newsize > length); /* Truncate isn't always atomic */
414}
415
416void jfs_truncate(struct inode *ip)
417{
418 jfs_info("jfs_truncate: size = 0x%lx", (ulong) ip->i_size);
419
Nick Piggin03158cd2007-10-16 01:25:25 -0700420 nobh_truncate_page(ip->i_mapping, ip->i_size, jfs_get_block);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700421
Dave Kleikamp82d5b9a2007-01-09 14:14:48 -0600422 IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700423 jfs_truncate_nolock(ip, ip->i_size);
424 IWRITE_UNLOCK(ip);
425}