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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// 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 truncate_inode_pages_final(&inode->i_data);
150
151 if (test_cflag(COMMIT_Freewmap, inode))
152 jfs_free_zero_link(inode);
153
154 diFree(inode);
155
156 /*
157 * Free the inode from the quota allocation.
158 */
159 dquot_free_inode(inode);
160 }
161 } else {
162 truncate_inode_pages_final(&inode->i_data);
163 }
164 clear_inode(inode);
165 dquot_drop(inode);
166
167 BUG_ON(!list_empty(&ji->anon_inode_list));
168
169 spin_lock_irq(&ji->ag_lock);
170 if (ji->active_ag != -1) {
171 struct bmap *bmap = JFS_SBI(inode->i_sb)->bmap;
172 atomic_dec(&bmap->db_active[ji->active_ag]);
173 ji->active_ag = -1;
174 }
175 spin_unlock_irq(&ji->ag_lock);
176}
177
178void jfs_dirty_inode(struct inode *inode, int flags)
179{
180 static int noisy = 5;
181
182 if (isReadOnly(inode)) {
183 if (!special_file(inode->i_mode) && noisy) {
184 /* kernel allows writes to devices on read-only
185 * partitions and may try to mark inode dirty
186 */
187 jfs_err("jfs_dirty_inode called on read-only volume");
188 jfs_err("Is remount racy?");
189 noisy--;
190 }
191 return;
192 }
193
194 set_cflag(COMMIT_Dirty, inode);
195}
196
197int jfs_get_block(struct inode *ip, sector_t lblock,
198 struct buffer_head *bh_result, int create)
199{
200 s64 lblock64 = lblock;
201 int rc = 0;
202 xad_t xad;
203 s64 xaddr;
204 int xflag;
205 s32 xlen = bh_result->b_size >> ip->i_blkbits;
206
207 /*
208 * Take appropriate lock on inode
209 */
210 if (create)
211 IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
212 else
213 IREAD_LOCK(ip, RDWRLOCK_NORMAL);
214
215 if (((lblock64 << ip->i_sb->s_blocksize_bits) < ip->i_size) &&
216 (!xtLookup(ip, lblock64, xlen, &xflag, &xaddr, &xlen, 0)) &&
217 xaddr) {
218 if (xflag & XAD_NOTRECORDED) {
219 if (!create)
220 /*
221 * Allocated but not recorded, read treats
222 * this as a hole
223 */
224 goto unlock;
225#ifdef _JFS_4K
226 XADoffset(&xad, lblock64);
227 XADlength(&xad, xlen);
228 XADaddress(&xad, xaddr);
229#else /* _JFS_4K */
230 /*
231 * As long as block size = 4K, this isn't a problem.
232 * We should mark the whole page not ABNR, but how
233 * will we know to mark the other blocks BH_New?
234 */
235 BUG();
236#endif /* _JFS_4K */
237 rc = extRecord(ip, &xad);
238 if (rc)
239 goto unlock;
240 set_buffer_new(bh_result);
241 }
242
243 map_bh(bh_result, ip->i_sb, xaddr);
244 bh_result->b_size = xlen << ip->i_blkbits;
245 goto unlock;
246 }
247 if (!create)
248 goto unlock;
249
250 /*
251 * Allocate a new block
252 */
253#ifdef _JFS_4K
254 if ((rc = extHint(ip, lblock64 << ip->i_sb->s_blocksize_bits, &xad)))
255 goto unlock;
256 rc = extAlloc(ip, xlen, lblock64, &xad, false);
257 if (rc)
258 goto unlock;
259
260 set_buffer_new(bh_result);
261 map_bh(bh_result, ip->i_sb, addressXAD(&xad));
262 bh_result->b_size = lengthXAD(&xad) << ip->i_blkbits;
263
264#else /* _JFS_4K */
265 /*
266 * We need to do whatever it takes to keep all but the last buffers
267 * in 4K pages - see jfs_write.c
268 */
269 BUG();
270#endif /* _JFS_4K */
271
272 unlock:
273 /*
274 * Release lock on inode
275 */
276 if (create)
277 IWRITE_UNLOCK(ip);
278 else
279 IREAD_UNLOCK(ip);
280 return rc;
281}
282
283static int jfs_writepage(struct page *page, struct writeback_control *wbc)
284{
285 return block_write_full_page(page, jfs_get_block, wbc);
286}
287
288static int jfs_writepages(struct address_space *mapping,
289 struct writeback_control *wbc)
290{
291 return mpage_writepages(mapping, wbc, jfs_get_block);
292}
293
294static int jfs_readpage(struct file *file, struct page *page)
295{
296 return mpage_readpage(page, jfs_get_block);
297}
298
299static void jfs_readahead(struct readahead_control *rac)
300{
301 mpage_readahead(rac, jfs_get_block);
302}
303
304static void jfs_write_failed(struct address_space *mapping, loff_t to)
305{
306 struct inode *inode = mapping->host;
307
308 if (to > inode->i_size) {
309 truncate_pagecache(inode, inode->i_size);
310 jfs_truncate(inode);
311 }
312}
313
314static int jfs_write_begin(struct file *file, struct address_space *mapping,
315 loff_t pos, unsigned len, unsigned flags,
316 struct page **pagep, void **fsdata)
317{
318 int ret;
319
320 ret = nobh_write_begin(mapping, pos, len, flags, pagep, fsdata,
321 jfs_get_block);
322 if (unlikely(ret))
323 jfs_write_failed(mapping, pos + len);
324
325 return ret;
326}
327
328static sector_t jfs_bmap(struct address_space *mapping, sector_t block)
329{
330 return generic_block_bmap(mapping, block, jfs_get_block);
331}
332
333static ssize_t jfs_direct_IO(struct kiocb *iocb, struct iov_iter *iter)
334{
335 struct file *file = iocb->ki_filp;
336 struct address_space *mapping = file->f_mapping;
337 struct inode *inode = file->f_mapping->host;
338 size_t count = iov_iter_count(iter);
339 ssize_t ret;
340
341 ret = blockdev_direct_IO(iocb, inode, iter, jfs_get_block);
342
343 /*
344 * In case of error extending write may have instantiated a few
345 * blocks outside i_size. Trim these off again.
346 */
347 if (unlikely(iov_iter_rw(iter) == WRITE && ret < 0)) {
348 loff_t isize = i_size_read(inode);
349 loff_t end = iocb->ki_pos + count;
350
351 if (end > isize)
352 jfs_write_failed(mapping, end);
353 }
354
355 return ret;
356}
357
358const struct address_space_operations jfs_aops = {
359 .readpage = jfs_readpage,
360 .readahead = jfs_readahead,
361 .writepage = jfs_writepage,
362 .writepages = jfs_writepages,
363 .write_begin = jfs_write_begin,
364 .write_end = nobh_write_end,
365 .bmap = jfs_bmap,
366 .direct_IO = jfs_direct_IO,
367};
368
369/*
370 * Guts of jfs_truncate. Called with locks already held. Can be called
371 * with directory for truncating directory index table.
372 */
373void jfs_truncate_nolock(struct inode *ip, loff_t length)
374{
375 loff_t newsize;
376 tid_t tid;
377
378 ASSERT(length >= 0);
379
380 if (test_cflag(COMMIT_Nolink, ip)) {
381 xtTruncate(0, ip, length, COMMIT_WMAP);
382 return;
383 }
384
385 do {
386 tid = txBegin(ip->i_sb, 0);
387
388 /*
389 * The commit_mutex cannot be taken before txBegin.
390 * txBegin may block and there is a chance the inode
391 * could be marked dirty and need to be committed
392 * before txBegin unblocks
393 */
394 mutex_lock(&JFS_IP(ip)->commit_mutex);
395
396 newsize = xtTruncate(tid, ip, length,
397 COMMIT_TRUNCATE | COMMIT_PWMAP);
398 if (newsize < 0) {
399 txEnd(tid);
400 mutex_unlock(&JFS_IP(ip)->commit_mutex);
401 break;
402 }
403
404 ip->i_mtime = ip->i_ctime = current_time(ip);
405 mark_inode_dirty(ip);
406
407 txCommit(tid, 1, &ip, 0);
408 txEnd(tid);
409 mutex_unlock(&JFS_IP(ip)->commit_mutex);
410 } while (newsize > length); /* Truncate isn't always atomic */
411}
412
413void jfs_truncate(struct inode *ip)
414{
415 jfs_info("jfs_truncate: size = 0x%lx", (ulong) ip->i_size);
416
417 nobh_truncate_page(ip->i_mapping, ip->i_size, jfs_get_block);
418
419 IWRITE_LOCK(ip, RDWRLOCK_NORMAL);
420 jfs_truncate_nolock(ip, ip->i_size);
421 IWRITE_UNLOCK(ip);
422}