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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
36struct 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 */
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 read-only volume",
106 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
127int 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
151void 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
179void 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
198int 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
284static int jfs_writepage(struct page *page, struct writeback_control *wbc)
285{
286 return block_write_full_page(page, jfs_get_block, wbc);
287}
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
306static 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
316static 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
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
335static ssize_t jfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
336{
337 struct file *file = iocb->ki_filp;
338 struct address_space *mapping = file->f_mapping;
339 struct inode *inode = file->f_mapping->host;
340 size_t count = iov_iter_count(iter);
341 ssize_t ret;
342
343 ret = blockdev_direct_IO(iocb, inode, iter, jfs_get_block);
344
345 /*
346 * In case of error extending write may have instantiated a few
347 * blocks outside i_size. Trim these off again.
348 */
349 if (unlikely(iov_iter_rw(iter) == WRITE && ret < 0)) {
350 loff_t isize = i_size_read(inode);
351 loff_t end = iocb->ki_pos + count;
352
353 if (end > isize)
354 jfs_write_failed(mapping, end);
355 }
356
357 return ret;
358}
359
360const struct address_space_operations jfs_aops = {
361 .readpage = jfs_readpage,
362 .readpages = jfs_readpages,
363 .writepage = jfs_writepage,
364 .writepages = jfs_writepages,
365 .write_begin = jfs_write_begin,
366 .write_end = nobh_write_end,
367 .bmap = jfs_bmap,
368 .direct_IO = jfs_direct_IO,
369};
370
371/*
372 * Guts of jfs_truncate. Called with locks already held. Can be called
373 * with directory for truncating directory index table.
374 */
375void jfs_truncate_nolock(struct inode *ip, loff_t length)
376{
377 loff_t newsize;
378 tid_t tid;
379
380 ASSERT(length >= 0);
381
382 if (test_cflag(COMMIT_Nolink, ip)) {
383 xtTruncate(0, ip, length, COMMIT_WMAP);
384 return;
385 }
386
387 do {
388 tid = txBegin(ip->i_sb, 0);
389
390 /*
391 * The commit_mutex cannot be taken before txBegin.
392 * txBegin may block and there is a chance the inode
393 * could be marked dirty and need to be committed
394 * before txBegin unblocks
395 */
396 mutex_lock(&JFS_IP(ip)->commit_mutex);
397
398 newsize = xtTruncate(tid, ip, length,
399 COMMIT_TRUNCATE | COMMIT_PWMAP);
400 if (newsize < 0) {
401 txEnd(tid);
402 mutex_unlock(&JFS_IP(ip)->commit_mutex);
403 break;
404 }
405
406 ip->i_mtime = ip->i_ctime = current_time(ip);
407 mark_inode_dirty(ip);
408
409 txCommit(tid, 1, &ip, 0);
410 txEnd(tid);
411 mutex_unlock(&JFS_IP(ip)->commit_mutex);
412 } while (newsize > length); /* Truncate isn't always atomic */
413}
414
415void jfs_truncate(struct inode *ip)
416{
417 jfs_info("jfs_truncate: size = 0x%lx", (ulong) ip->i_size);
418
419 nobh_truncate_page(ip->i_mapping, ip->i_size, jfs_get_block);
420
421 IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
422 jfs_truncate_nolock(ip, ip->i_size);
423 IWRITE_UNLOCK(ip);
424}
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/writeback.h>
26#include "jfs_incore.h"
27#include "jfs_inode.h"
28#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
35struct inode *jfs_iget(struct super_block *sb, unsigned long ino)
36{
37 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);
50 }
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;
63 } else {
64 inode->i_op = &jfs_fast_symlink_inode_operations;
65 /*
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 }
71 } else {
72 inode->i_op = &jfs_file_inode_operations;
73 init_special_inode(inode, inode->i_mode, inode->i_rdev);
74 }
75 unlock_new_inode(inode);
76 return inode;
77}
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);
111 mutex_lock(&JFS_IP(inode)->commit_mutex);
112
113 /*
114 * Retest inode state after taking commit_mutex
115 */
116 if (inode->i_nlink && test_cflag(COMMIT_Dirty, inode))
117 rc = txCommit(tid, 1, &inode, wait ? COMMIT_SYNC : 0);
118
119 txEnd(tid);
120 mutex_unlock(&JFS_IP(inode)->commit_mutex);
121 return rc;
122}
123
124int jfs_write_inode(struct inode *inode, struct writeback_control *wbc)
125{
126 int wait = wbc->sync_mode == WB_SYNC_ALL;
127
128 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
148void jfs_evict_inode(struct inode *inode)
149{
150 jfs_info("In jfs_evict_inode, inode = 0x%p", inode);
151
152 if (!inode->i_nlink && !is_bad_inode(inode)) {
153 dquot_initialize(inode);
154
155 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 {
170 truncate_inode_pages(&inode->i_data, 0);
171 }
172 end_writeback(inode);
173 dquot_drop(inode);
174}
175
176void jfs_dirty_inode(struct inode *inode, int flags)
177{
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
195int jfs_get_block(struct inode *ip, sector_t lblock,
196 struct buffer_head *bh_result, int create)
197{
198 s64 lblock64 = lblock;
199 int rc = 0;
200 xad_t xad;
201 s64 xaddr;
202 int xflag;
203 s32 xlen = bh_result->b_size >> ip->i_blkbits;
204
205 /*
206 * Take appropriate lock on inode
207 */
208 if (create)
209 IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
210 else
211 IREAD_LOCK(ip, RDWRLOCK_NORMAL);
212
213 if (((lblock64 << ip->i_sb->s_blocksize_bits) < ip->i_size) &&
214 (!xtLookup(ip, lblock64, xlen, &xflag, &xaddr, &xlen, 0)) &&
215 xaddr) {
216 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;
254 rc = extAlloc(ip, xlen, lblock64, &xad, false);
255 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 */
274 if (create)
275 IWRITE_UNLOCK(ip);
276 else
277 IREAD_UNLOCK(ip);
278 return rc;
279}
280
281static int jfs_writepage(struct page *page, struct writeback_control *wbc)
282{
283 return block_write_full_page(page, jfs_get_block, wbc);
284}
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
303static 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)
306{
307 int ret;
308
309 ret = nobh_write_begin(mapping, pos, len, flags, pagep, fsdata,
310 jfs_get_block);
311 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;
318}
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;
330 ssize_t ret;
331
332 ret = blockdev_direct_IO(rw, iocb, inode, iov, offset, nr_segs,
333 jfs_get_block);
334
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;
348}
349
350const struct address_space_operations jfs_aops = {
351 .readpage = jfs_readpage,
352 .readpages = jfs_readpages,
353 .writepage = jfs_writepage,
354 .writepages = jfs_writepages,
355 .write_begin = jfs_write_begin,
356 .write_end = nobh_write_end,
357 .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 /*
381 * The commit_mutex cannot be taken before txBegin.
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 */
386 mutex_lock(&JFS_IP(ip)->commit_mutex);
387
388 newsize = xtTruncate(tid, ip, length,
389 COMMIT_TRUNCATE | COMMIT_PWMAP);
390 if (newsize < 0) {
391 txEnd(tid);
392 mutex_unlock(&JFS_IP(ip)->commit_mutex);
393 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);
401 mutex_unlock(&JFS_IP(ip)->commit_mutex);
402 } 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
409 nobh_truncate_page(ip->i_mapping, ip->i_size, jfs_get_block);
410
411 IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
412 jfs_truncate_nolock(ip, ip->i_size);
413 IWRITE_UNLOCK(ip);
414}