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v4.17
 
  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}
v6.13.7
  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}