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1// SPDX-License-Identifier: GPL-2.0-or-later
2/*
3 * Copyright (C) International Business Machines Corp., 2000-2004
4 * Portions Copyright (C) Christoph Hellwig, 2001-2002
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>
12#include <linux/uio.h>
13#include <linux/writeback.h>
14#include "jfs_incore.h"
15#include "jfs_inode.h"
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"
21#include "jfs_dmap.h"
22
23
24struct inode *jfs_iget(struct super_block *sb, unsigned long ino)
25{
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);
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;
51 inode_nohighmem(inode);
52 inode->i_mapping->a_ops = &jfs_aops;
53 } else {
54 inode->i_op = &jfs_fast_symlink_inode_operations;
55 inode->i_link = JFS_IP(inode)->i_inline;
56 /*
57 * The inline data should be null-terminated, but
58 * don't let on-disk corruption crash the kernel
59 */
60 inode->i_link[inode->i_size] = '\0';
61 }
62 } else {
63 inode->i_op = &jfs_file_inode_operations;
64 init_special_inode(inode, inode->i_mode, inode->i_rdev);
65 }
66 unlock_new_inode(inode);
67 return inode;
68}
69
70/*
71 * Workhorse of both fsync & write_inode
72 */
73int 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) {
93 jfs_err("jfs_commit_inode(0x%p) called on read-only volume",
94 inode);
95 jfs_err("Is remount racy?");
96 noisy--;
97 }
98 return 0;
99 }
100
101 tid = txBegin(inode->i_sb, COMMIT_INODE);
102 mutex_lock(&JFS_IP(inode)->commit_mutex);
103
104 /*
105 * Retest inode state after taking commit_mutex
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);
111 mutex_unlock(&JFS_IP(inode)->commit_mutex);
112 return rc;
113}
114
115int jfs_write_inode(struct inode *inode, struct writeback_control *wbc)
116{
117 int wait = wbc->sync_mode == WB_SYNC_ALL;
118
119 if (inode->i_nlink == 0)
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 */
126 if (!test_cflag(COMMIT_Dirty, inode)) {
127 /* Make sure committed changes hit the disk */
128 jfs_flush_journal(JFS_SBI(inode->i_sb)->log, wait);
129 return 0;
130 }
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
139void jfs_evict_inode(struct inode *inode)
140{
141 struct jfs_inode_info *ji = JFS_IP(inode);
142
143 jfs_info("In jfs_evict_inode, inode = 0x%p", inode);
144
145 if (!inode->i_nlink && !is_bad_inode(inode)) {
146 dquot_initialize(inode);
147
148 if (JFS_IP(inode)->fileset == FILESYSTEM_I) {
149 struct inode *ipimap = JFS_SBI(inode->i_sb)->ipimap;
150 truncate_inode_pages_final(&inode->i_data);
151
152 if (test_cflag(COMMIT_Freewmap, inode))
153 jfs_free_zero_link(inode);
154
155 if (ipimap && JFS_IP(ipimap)->i_imap)
156 diFree(inode);
157
158 /*
159 * Free the inode from the quota allocation.
160 */
161 dquot_free_inode(inode);
162 }
163 } else {
164 truncate_inode_pages_final(&inode->i_data);
165 }
166 clear_inode(inode);
167 dquot_drop(inode);
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);
178}
179
180void jfs_dirty_inode(struct inode *inode, int flags)
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
199int jfs_get_block(struct inode *ip, sector_t lblock,
200 struct buffer_head *bh_result, int create)
201{
202 s64 lblock64 = lblock;
203 int rc = 0;
204 xad_t xad;
205 s64 xaddr;
206 int xflag;
207 s32 xlen = bh_result->b_size >> ip->i_blkbits;
208
209 /*
210 * Take appropriate lock on inode
211 */
212 if (create)
213 IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
214 else
215 IREAD_LOCK(ip, RDWRLOCK_NORMAL);
216
217 if (((lblock64 << ip->i_sb->s_blocksize_bits) < ip->i_size) &&
218 (!xtLookup(ip, lblock64, xlen, &xflag, &xaddr, &xlen, 0)) &&
219 xaddr) {
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;
227 XADoffset(&xad, lblock64);
228 XADlength(&xad, xlen);
229 XADaddress(&xad, xaddr);
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 */
246 if ((rc = extHint(ip, lblock64 << ip->i_sb->s_blocksize_bits, &xad)))
247 goto unlock;
248 rc = extAlloc(ip, xlen, lblock64, &xad, false);
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
256 unlock:
257 /*
258 * Release lock on inode
259 */
260 if (create)
261 IWRITE_UNLOCK(ip);
262 else
263 IREAD_UNLOCK(ip);
264 return rc;
265}
266
267static int jfs_writepages(struct address_space *mapping,
268 struct writeback_control *wbc)
269{
270 return mpage_writepages(mapping, wbc, jfs_get_block);
271}
272
273static int jfs_read_folio(struct file *file, struct folio *folio)
274{
275 return mpage_read_folio(folio, jfs_get_block);
276}
277
278static void jfs_readahead(struct readahead_control *rac)
279{
280 mpage_readahead(rac, jfs_get_block);
281}
282
283static 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) {
288 truncate_pagecache(inode, inode->i_size);
289 jfs_truncate(inode);
290 }
291}
292
293static int jfs_write_begin(struct file *file, struct address_space *mapping,
294 loff_t pos, unsigned len,
295 struct folio **foliop, void **fsdata)
296{
297 int ret;
298
299 ret = block_write_begin(mapping, pos, len, foliop, jfs_get_block);
300 if (unlikely(ret))
301 jfs_write_failed(mapping, pos + len);
302
303 return ret;
304}
305
306static int jfs_write_end(struct file *file, struct address_space *mapping,
307 loff_t pos, unsigned len, unsigned copied, struct folio *folio,
308 void *fsdata)
309{
310 int ret;
311
312 ret = generic_write_end(file, mapping, pos, len, copied, folio, fsdata);
313 if (ret < len)
314 jfs_write_failed(mapping, pos + len);
315 return ret;
316}
317
318static sector_t jfs_bmap(struct address_space *mapping, sector_t block)
319{
320 return generic_block_bmap(mapping, block, jfs_get_block);
321}
322
323static ssize_t jfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
324{
325 struct file *file = iocb->ki_filp;
326 struct address_space *mapping = file->f_mapping;
327 struct inode *inode = file->f_mapping->host;
328 size_t count = iov_iter_count(iter);
329 ssize_t ret;
330
331 ret = blockdev_direct_IO(iocb, inode, iter, jfs_get_block);
332
333 /*
334 * In case of error extending write may have instantiated a few
335 * blocks outside i_size. Trim these off again.
336 */
337 if (unlikely(iov_iter_rw(iter) == WRITE && ret < 0)) {
338 loff_t isize = i_size_read(inode);
339 loff_t end = iocb->ki_pos + count;
340
341 if (end > isize)
342 jfs_write_failed(mapping, end);
343 }
344
345 return ret;
346}
347
348const struct address_space_operations jfs_aops = {
349 .dirty_folio = block_dirty_folio,
350 .invalidate_folio = block_invalidate_folio,
351 .read_folio = jfs_read_folio,
352 .readahead = jfs_readahead,
353 .writepages = jfs_writepages,
354 .write_begin = jfs_write_begin,
355 .write_end = jfs_write_end,
356 .bmap = jfs_bmap,
357 .direct_IO = jfs_direct_IO,
358 .migrate_folio = buffer_migrate_folio,
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 inode_set_mtime_to_ts(ip, inode_set_ctime_current(ip));
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 block_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}
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}