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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 Hellwiga9185b42010-03-05 09:21:37 +010025#include <linux/writeback.h>
Linus Torvalds1da177e2005-04-16 15:20:36 -070026#include "jfs_incore.h"
Dave Kleikamp1868f4a2005-05-04 15:29:35 -050027#include "jfs_inode.h"
Linus Torvalds1da177e2005-04-16 15:20:36 -070028#include "jfs_filsys.h"
29#include "jfs_imap.h"
30#include "jfs_extent.h"
31#include "jfs_unicode.h"
32#include "jfs_debug.h"
33
34
David Howellseab1df72008-02-07 00:15:43 -080035struct inode *jfs_iget(struct super_block *sb, unsigned long ino)
Linus Torvalds1da177e2005-04-16 15:20:36 -070036{
David Howellseab1df72008-02-07 00:15:43 -080037 struct inode *inode;
38 int ret;
39
40 inode = iget_locked(sb, ino);
41 if (!inode)
42 return ERR_PTR(-ENOMEM);
43 if (!(inode->i_state & I_NEW))
44 return inode;
45
46 ret = diRead(inode);
47 if (ret < 0) {
48 iget_failed(inode);
49 return ERR_PTR(ret);
Linus Torvalds1da177e2005-04-16 15:20:36 -070050 }
51
52 if (S_ISREG(inode->i_mode)) {
53 inode->i_op = &jfs_file_inode_operations;
54 inode->i_fop = &jfs_file_operations;
55 inode->i_mapping->a_ops = &jfs_aops;
56 } else if (S_ISDIR(inode->i_mode)) {
57 inode->i_op = &jfs_dir_inode_operations;
58 inode->i_fop = &jfs_dir_operations;
59 } else if (S_ISLNK(inode->i_mode)) {
60 if (inode->i_size >= IDATASIZE) {
61 inode->i_op = &page_symlink_inode_operations;
62 inode->i_mapping->a_ops = &jfs_aops;
Dave Kleikampd69e83d2008-12-16 10:21:34 -060063 } else {
Dmitry Monakhovc7f2e1f2010-04-16 08:05:50 -050064 inode->i_op = &jfs_fast_symlink_inode_operations;
Dave Kleikampd69e83d2008-12-16 10:21:34 -060065 /*
66 * The inline data should be null-terminated, but
67 * don't let on-disk corruption crash the kernel
68 */
69 JFS_IP(inode)->i_inline[inode->i_size] = '\0';
70 }
Linus Torvalds1da177e2005-04-16 15:20:36 -070071 } else {
72 inode->i_op = &jfs_file_inode_operations;
73 init_special_inode(inode, inode->i_mode, inode->i_rdev);
74 }
David Howellseab1df72008-02-07 00:15:43 -080075 unlock_new_inode(inode);
76 return inode;
Linus Torvalds1da177e2005-04-16 15:20:36 -070077}
78
79/*
80 * Workhorse of both fsync & write_inode
81 */
82int jfs_commit_inode(struct inode *inode, int wait)
83{
84 int rc = 0;
85 tid_t tid;
86 static int noisy = 5;
87
88 jfs_info("In jfs_commit_inode, inode = 0x%p", inode);
89
90 /*
91 * Don't commit if inode has been committed since last being
92 * marked dirty, or if it has been deleted.
93 */
94 if (inode->i_nlink == 0 || !test_cflag(COMMIT_Dirty, inode))
95 return 0;
96
97 if (isReadOnly(inode)) {
98 /* kernel allows writes to devices on read-only
99 * partitions and may think inode is dirty
100 */
101 if (!special_file(inode->i_mode) && noisy) {
102 jfs_err("jfs_commit_inode(0x%p) called on "
103 "read-only volume", inode);
104 jfs_err("Is remount racy?");
105 noisy--;
106 }
107 return 0;
108 }
109
110 tid = txBegin(inode->i_sb, COMMIT_INODE);
Ingo Molnar1de87442006-01-24 15:22:50 -0600111 mutex_lock(&JFS_IP(inode)->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700112
113 /*
Ingo Molnar1de87442006-01-24 15:22:50 -0600114 * Retest inode state after taking commit_mutex
Linus Torvalds1da177e2005-04-16 15:20:36 -0700115 */
116 if (inode->i_nlink && test_cflag(COMMIT_Dirty, inode))
117 rc = txCommit(tid, 1, &inode, wait ? COMMIT_SYNC : 0);
118
119 txEnd(tid);
Ingo Molnar1de87442006-01-24 15:22:50 -0600120 mutex_unlock(&JFS_IP(inode)->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700121 return rc;
122}
123
Christoph Hellwiga9185b42010-03-05 09:21:37 +0100124int jfs_write_inode(struct inode *inode, struct writeback_control *wbc)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700125{
Christoph Hellwiga9185b42010-03-05 09:21:37 +0100126 int wait = wbc->sync_mode == WB_SYNC_ALL;
127
Linus Torvalds1da177e2005-04-16 15:20:36 -0700128 if (test_cflag(COMMIT_Nolink, inode))
129 return 0;
130 /*
131 * If COMMIT_DIRTY is not set, the inode isn't really dirty.
132 * It has been committed since the last change, but was still
133 * on the dirty inode list.
134 */
135 if (!test_cflag(COMMIT_Dirty, inode)) {
136 /* Make sure committed changes hit the disk */
137 jfs_flush_journal(JFS_SBI(inode->i_sb)->log, wait);
138 return 0;
139 }
140
141 if (jfs_commit_inode(inode, wait)) {
142 jfs_err("jfs_write_inode: jfs_commit_inode failed!");
143 return -EIO;
144 } else
145 return 0;
146}
147
Al Viro62aff862010-06-07 00:28:54 -0400148void jfs_evict_inode(struct inode *inode)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700149{
Al Viro62aff862010-06-07 00:28:54 -0400150 jfs_info("In jfs_evict_inode, inode = 0x%p", inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700151
Al Viro62aff862010-06-07 00:28:54 -0400152 if (!inode->i_nlink && !is_bad_inode(inode)) {
Christoph Hellwig871a2932010-03-03 09:05:07 -0500153 dquot_initialize(inode);
Christoph Hellwig907f4552010-03-03 09:05:06 -0500154
Al Viro62aff862010-06-07 00:28:54 -0400155 if (JFS_IP(inode)->fileset == FILESYSTEM_I) {
156 truncate_inode_pages(&inode->i_data, 0);
157
158 if (test_cflag(COMMIT_Freewmap, inode))
159 jfs_free_zero_link(inode);
160
161 diFree(inode);
162
163 /*
164 * Free the inode from the quota allocation.
165 */
166 dquot_initialize(inode);
167 dquot_free_inode(inode);
168 }
169 } else {
Linus Torvalds32983692005-09-11 10:14:54 -0700170 truncate_inode_pages(&inode->i_data, 0);
Dave Kleikampb1b5d7f2005-08-30 14:28:56 -0500171 }
Jan Karadbd57682012-05-03 14:48:02 +0200172 clear_inode(inode);
Al Viro62aff862010-06-07 00:28:54 -0400173 dquot_drop(inode);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700174}
175
Christoph Hellwigaa385722011-05-27 06:53:02 -0400176void jfs_dirty_inode(struct inode *inode, int flags)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700177{
178 static int noisy = 5;
179
180 if (isReadOnly(inode)) {
181 if (!special_file(inode->i_mode) && noisy) {
182 /* kernel allows writes to devices on read-only
183 * partitions and may try to mark inode dirty
184 */
185 jfs_err("jfs_dirty_inode called on read-only volume");
186 jfs_err("Is remount racy?");
187 noisy--;
188 }
189 return;
190 }
191
192 set_cflag(COMMIT_Dirty, inode);
193}
194
Dave Kleikamp115ff502006-07-26 14:52:13 -0500195int jfs_get_block(struct inode *ip, sector_t lblock,
196 struct buffer_head *bh_result, int create)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700197{
198 s64 lblock64 = lblock;
199 int rc = 0;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700200 xad_t xad;
201 s64 xaddr;
202 int xflag;
Dave Kleikamp115ff502006-07-26 14:52:13 -0500203 s32 xlen = bh_result->b_size >> ip->i_blkbits;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700204
205 /*
Linus Torvalds1da177e2005-04-16 15:20:36 -0700206 * Take appropriate lock on inode
207 */
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600208 if (create)
Dave Kleikamp82d5b9a2007-01-09 14:14:48 -0600209 IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600210 else
Dave Kleikamp82d5b9a2007-01-09 14:14:48 -0600211 IREAD_LOCK(ip, RDWRLOCK_NORMAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700212
213 if (((lblock64 << ip->i_sb->s_blocksize_bits) < ip->i_size) &&
Dave Kleikamp115ff502006-07-26 14:52:13 -0500214 (!xtLookup(ip, lblock64, xlen, &xflag, &xaddr, &xlen, 0)) &&
Dave Kleikamp66284652005-05-02 12:25:13 -0600215 xaddr) {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700216 if (xflag & XAD_NOTRECORDED) {
217 if (!create)
218 /*
219 * Allocated but not recorded, read treats
220 * this as a hole
221 */
222 goto unlock;
223#ifdef _JFS_4K
224 XADoffset(&xad, lblock64);
225 XADlength(&xad, xlen);
226 XADaddress(&xad, xaddr);
227#else /* _JFS_4K */
228 /*
229 * As long as block size = 4K, this isn't a problem.
230 * We should mark the whole page not ABNR, but how
231 * will we know to mark the other blocks BH_New?
232 */
233 BUG();
234#endif /* _JFS_4K */
235 rc = extRecord(ip, &xad);
236 if (rc)
237 goto unlock;
238 set_buffer_new(bh_result);
239 }
240
241 map_bh(bh_result, ip->i_sb, xaddr);
242 bh_result->b_size = xlen << ip->i_blkbits;
243 goto unlock;
244 }
245 if (!create)
246 goto unlock;
247
248 /*
249 * Allocate a new block
250 */
251#ifdef _JFS_4K
252 if ((rc = extHint(ip, lblock64 << ip->i_sb->s_blocksize_bits, &xad)))
253 goto unlock;
Richard Knutsson4d817152006-09-30 23:27:14 -0700254 rc = extAlloc(ip, xlen, lblock64, &xad, false);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700255 if (rc)
256 goto unlock;
257
258 set_buffer_new(bh_result);
259 map_bh(bh_result, ip->i_sb, addressXAD(&xad));
260 bh_result->b_size = lengthXAD(&xad) << ip->i_blkbits;
261
262#else /* _JFS_4K */
263 /*
264 * We need to do whatever it takes to keep all but the last buffers
265 * in 4K pages - see jfs_write.c
266 */
267 BUG();
268#endif /* _JFS_4K */
269
270 unlock:
271 /*
272 * Release lock on inode
273 */
Dave Kleikamp7fab4792005-05-02 12:25:02 -0600274 if (create)
275 IWRITE_UNLOCK(ip);
276 else
277 IREAD_UNLOCK(ip);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700278 return rc;
279}
280
Linus Torvalds1da177e2005-04-16 15:20:36 -0700281static int jfs_writepage(struct page *page, struct writeback_control *wbc)
282{
Nick Piggind5c5f842007-10-16 01:25:22 -0700283 return block_write_full_page(page, jfs_get_block, wbc);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700284}
285
286static int jfs_writepages(struct address_space *mapping,
287 struct writeback_control *wbc)
288{
289 return mpage_writepages(mapping, wbc, jfs_get_block);
290}
291
292static int jfs_readpage(struct file *file, struct page *page)
293{
294 return mpage_readpage(page, jfs_get_block);
295}
296
297static int jfs_readpages(struct file *file, struct address_space *mapping,
298 struct list_head *pages, unsigned nr_pages)
299{
300 return mpage_readpages(mapping, pages, nr_pages, jfs_get_block);
301}
302
Nick Piggind5c5f842007-10-16 01:25:22 -0700303static int jfs_write_begin(struct file *file, struct address_space *mapping,
304 loff_t pos, unsigned len, unsigned flags,
305 struct page **pagep, void **fsdata)
Linus Torvalds1da177e2005-04-16 15:20:36 -0700306{
Christoph Hellwigea0f04e2010-06-04 11:29:54 +0200307 int ret;
308
309 ret = nobh_write_begin(mapping, pos, len, flags, pagep, fsdata,
Nick Piggind5c5f842007-10-16 01:25:22 -0700310 jfs_get_block);
Christoph Hellwigea0f04e2010-06-04 11:29:54 +0200311 if (unlikely(ret)) {
312 loff_t isize = mapping->host->i_size;
313 if (pos + len > isize)
314 vmtruncate(mapping->host, isize);
315 }
316
317 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700318}
319
320static sector_t jfs_bmap(struct address_space *mapping, sector_t block)
321{
322 return generic_block_bmap(mapping, block, jfs_get_block);
323}
324
325static ssize_t jfs_direct_IO(int rw, struct kiocb *iocb,
326 const struct iovec *iov, loff_t offset, unsigned long nr_segs)
327{
328 struct file *file = iocb->ki_filp;
329 struct inode *inode = file->f_mapping->host;
Christoph Hellwigeafdc7d2010-06-04 11:29:53 +0200330 ssize_t ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700331
Christoph Hellwigaacfc19c2011-06-24 14:29:47 -0400332 ret = blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs,
333 jfs_get_block);
Christoph Hellwigeafdc7d2010-06-04 11:29:53 +0200334
335 /*
336 * In case of error extending write may have instantiated a few
337 * blocks outside i_size. Trim these off again.
338 */
339 if (unlikely((rw & WRITE) && ret < 0)) {
340 loff_t isize = i_size_read(inode);
341 loff_t end = offset + iov_length(iov, nr_segs);
342
343 if (end > isize)
344 vmtruncate(inode, isize);
345 }
346
347 return ret;
Linus Torvalds1da177e2005-04-16 15:20:36 -0700348}
349
Christoph Hellwigf5e54d62006-06-28 04:26:44 -0700350const struct address_space_operations jfs_aops = {
Linus Torvalds1da177e2005-04-16 15:20:36 -0700351 .readpage = jfs_readpage,
352 .readpages = jfs_readpages,
353 .writepage = jfs_writepage,
354 .writepages = jfs_writepages,
Nick Piggind5c5f842007-10-16 01:25:22 -0700355 .write_begin = jfs_write_begin,
Nick Piggin03158cd2007-10-16 01:25:25 -0700356 .write_end = nobh_write_end,
Linus Torvalds1da177e2005-04-16 15:20:36 -0700357 .bmap = jfs_bmap,
358 .direct_IO = jfs_direct_IO,
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 */
365void 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 /*
Ingo Molnar1de87442006-01-24 15:22:50 -0600381 * The commit_mutex cannot be taken before txBegin.
Linus Torvalds1da177e2005-04-16 15:20:36 -0700382 * 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 */
Ingo Molnar1de87442006-01-24 15:22:50 -0600386 mutex_lock(&JFS_IP(ip)->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700387
388 newsize = xtTruncate(tid, ip, length,
389 COMMIT_TRUNCATE | COMMIT_PWMAP);
390 if (newsize < 0) {
391 txEnd(tid);
Ingo Molnar1de87442006-01-24 15:22:50 -0600392 mutex_unlock(&JFS_IP(ip)->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700393 break;
394 }
395
396 ip->i_mtime = ip->i_ctime = CURRENT_TIME;
397 mark_inode_dirty(ip);
398
399 txCommit(tid, 1, &ip, 0);
400 txEnd(tid);
Ingo Molnar1de87442006-01-24 15:22:50 -0600401 mutex_unlock(&JFS_IP(ip)->commit_mutex);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700402 } while (newsize > length); /* Truncate isn't always atomic */
403}
404
405void jfs_truncate(struct inode *ip)
406{
407 jfs_info("jfs_truncate: size = 0x%lx", (ulong) ip->i_size);
408
Nick Piggin03158cd2007-10-16 01:25:25 -0700409 nobh_truncate_page(ip->i_mapping, ip->i_size, jfs_get_block);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700410
Dave Kleikamp82d5b9a2007-01-09 14:14:48 -0600411 IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
Linus Torvalds1da177e2005-04-16 15:20:36 -0700412 jfs_truncate_nolock(ip, ip->i_size);
413 IWRITE_UNLOCK(ip);
414}