blob: a6651956482e121b460ccadb5446892efee220a7 [file] [log] [blame]
Mark Fashehccd979b2005-12-15 14:31:24 -08001/* -*- mode: c; c-basic-offset: 8; -*-
2 * vim: noexpandtab sw=8 ts=8 sts=0:
3 *
4 * file.c
5 *
6 * File open, close, extend, truncate
7 *
8 * Copyright (C) 2002, 2004 Oracle. All rights reserved.
9 *
10 * This program is free software; you can redistribute it and/or
11 * modify it under the terms of the GNU General Public
12 * License as published by the Free Software Foundation; either
13 * version 2 of the License, or (at your option) any later version.
14 *
15 * This program is distributed in the hope that it will be useful,
16 * but WITHOUT ANY WARRANTY; without even the implied warranty of
17 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
18 * General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public
21 * License along with this program; if not, write to the
22 * Free Software Foundation, Inc., 59 Temple Place - Suite 330,
23 * Boston, MA 021110-1307, USA.
24 */
25
Randy Dunlap16f7e0f2006-01-11 12:17:46 -080026#include <linux/capability.h>
Mark Fashehccd979b2005-12-15 14:31:24 -080027#include <linux/fs.h>
28#include <linux/types.h>
29#include <linux/slab.h>
30#include <linux/highmem.h>
31#include <linux/pagemap.h>
32#include <linux/uio.h>
Mark Fashehe2057c52006-10-03 17:53:05 -070033#include <linux/sched.h>
Jens Axboed6b29d72007-06-04 09:59:47 +020034#include <linux/splice.h>
Tiger Yang7f1a37e2006-11-15 15:48:42 +080035#include <linux/mount.h>
Mark Fasheh9517bac2007-02-09 20:24:12 -080036#include <linux/writeback.h>
Mark Fasheh385820a2007-07-19 00:14:38 -070037#include <linux/falloc.h>
Jan Karaa90714c2008-10-09 19:38:40 +020038#include <linux/quotaops.h>
Jan Kara04eda1a2010-08-05 20:32:45 +020039#include <linux/blkdev.h>
Mark Fashehccd979b2005-12-15 14:31:24 -080040
41#define MLOG_MASK_PREFIX ML_INODE
42#include <cluster/masklog.h>
43
44#include "ocfs2.h"
45
46#include "alloc.h"
47#include "aops.h"
48#include "dir.h"
49#include "dlmglue.h"
50#include "extent_map.h"
51#include "file.h"
52#include "sysfile.h"
53#include "inode.h"
Herbert Poetzlca4d1472006-07-03 17:27:12 -070054#include "ioctl.h"
Mark Fashehccd979b2005-12-15 14:31:24 -080055#include "journal.h"
Mark Fasheh53fc6222007-12-20 16:49:04 -080056#include "locks.h"
Mark Fashehccd979b2005-12-15 14:31:24 -080057#include "mmap.h"
58#include "suballoc.h"
59#include "super.h"
Tiger Yangcf1d6c72008-08-18 17:11:00 +080060#include "xattr.h"
Tiger Yang23fc2702008-11-14 11:17:18 +080061#include "acl.h"
Jan Karaa90714c2008-10-09 19:38:40 +020062#include "quota.h"
Tao Ma293b2f72009-08-25 08:02:48 +080063#include "refcounttree.h"
Mark Fashehccd979b2005-12-15 14:31:24 -080064
65#include "buffer_head_io.h"
66
Mark Fasheh53fc6222007-12-20 16:49:04 -080067static int ocfs2_init_file_private(struct inode *inode, struct file *file)
68{
69 struct ocfs2_file_private *fp;
70
71 fp = kzalloc(sizeof(struct ocfs2_file_private), GFP_KERNEL);
72 if (!fp)
73 return -ENOMEM;
74
75 fp->fp_file = file;
76 mutex_init(&fp->fp_mutex);
77 ocfs2_file_lock_res_init(&fp->fp_flock, fp);
78 file->private_data = fp;
79
80 return 0;
81}
82
83static void ocfs2_free_file_private(struct inode *inode, struct file *file)
84{
85 struct ocfs2_file_private *fp = file->private_data;
86 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
87
88 if (fp) {
89 ocfs2_simple_drop_lockres(osb, &fp->fp_flock);
90 ocfs2_lock_res_free(&fp->fp_flock);
91 kfree(fp);
92 file->private_data = NULL;
93 }
94}
95
Mark Fashehccd979b2005-12-15 14:31:24 -080096static int ocfs2_file_open(struct inode *inode, struct file *file)
97{
98 int status;
99 int mode = file->f_flags;
100 struct ocfs2_inode_info *oi = OCFS2_I(inode);
101
102 mlog_entry("(0x%p, 0x%p, '%.*s')\n", inode, file,
Josef Sipekd28c9172006-12-08 02:37:25 -0800103 file->f_path.dentry->d_name.len, file->f_path.dentry->d_name.name);
Mark Fashehccd979b2005-12-15 14:31:24 -0800104
Christoph Hellwig907f4552010-03-03 09:05:06 -0500105 if (file->f_mode & FMODE_WRITE)
Christoph Hellwig871a2932010-03-03 09:05:07 -0500106 dquot_initialize(inode);
Christoph Hellwig907f4552010-03-03 09:05:06 -0500107
Mark Fashehccd979b2005-12-15 14:31:24 -0800108 spin_lock(&oi->ip_lock);
109
110 /* Check that the inode hasn't been wiped from disk by another
111 * node. If it hasn't then we're safe as long as we hold the
112 * spin lock until our increment of open count. */
113 if (OCFS2_I(inode)->ip_flags & OCFS2_INODE_DELETED) {
114 spin_unlock(&oi->ip_lock);
115
116 status = -ENOENT;
117 goto leave;
118 }
119
120 if (mode & O_DIRECT)
121 oi->ip_flags |= OCFS2_INODE_OPEN_DIRECT;
122
123 oi->ip_open_count++;
124 spin_unlock(&oi->ip_lock);
Mark Fasheh53fc6222007-12-20 16:49:04 -0800125
126 status = ocfs2_init_file_private(inode, file);
127 if (status) {
128 /*
129 * We want to set open count back if we're failing the
130 * open.
131 */
132 spin_lock(&oi->ip_lock);
133 oi->ip_open_count--;
134 spin_unlock(&oi->ip_lock);
135 }
136
Mark Fashehccd979b2005-12-15 14:31:24 -0800137leave:
138 mlog_exit(status);
139 return status;
140}
141
142static int ocfs2_file_release(struct inode *inode, struct file *file)
143{
144 struct ocfs2_inode_info *oi = OCFS2_I(inode);
145
146 mlog_entry("(0x%p, 0x%p, '%.*s')\n", inode, file,
Josef Sipekd28c9172006-12-08 02:37:25 -0800147 file->f_path.dentry->d_name.len,
148 file->f_path.dentry->d_name.name);
Mark Fashehccd979b2005-12-15 14:31:24 -0800149
150 spin_lock(&oi->ip_lock);
151 if (!--oi->ip_open_count)
152 oi->ip_flags &= ~OCFS2_INODE_OPEN_DIRECT;
153 spin_unlock(&oi->ip_lock);
154
Mark Fasheh53fc6222007-12-20 16:49:04 -0800155 ocfs2_free_file_private(inode, file);
156
Mark Fashehccd979b2005-12-15 14:31:24 -0800157 mlog_exit(0);
158
159 return 0;
160}
161
Mark Fasheh53fc6222007-12-20 16:49:04 -0800162static int ocfs2_dir_open(struct inode *inode, struct file *file)
163{
164 return ocfs2_init_file_private(inode, file);
165}
166
167static int ocfs2_dir_release(struct inode *inode, struct file *file)
168{
169 ocfs2_free_file_private(inode, file);
170 return 0;
171}
172
Christoph Hellwig7ea80852010-05-26 17:53:25 +0200173static int ocfs2_sync_file(struct file *file, int datasync)
Mark Fashehccd979b2005-12-15 14:31:24 -0800174{
175 int err = 0;
176 journal_t *journal;
Christoph Hellwig7ea80852010-05-26 17:53:25 +0200177 struct inode *inode = file->f_mapping->host;
Mark Fashehccd979b2005-12-15 14:31:24 -0800178 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
179
Joel Beckerc0e1a3e2010-09-15 16:56:54 -0700180 mlog_entry("(0x%p, %d, 0x%p, '%.*s')\n", file, datasync,
181 file->f_path.dentry, file->f_path.dentry->d_name.len,
182 file->f_path.dentry->d_name.name);
Mark Fashehccd979b2005-12-15 14:31:24 -0800183
Jan Kara04eda1a2010-08-05 20:32:45 +0200184 if (datasync && !(inode->i_state & I_DIRTY_DATASYNC)) {
185 /*
186 * We still have to flush drive's caches to get data to the
187 * platter
188 */
189 if (osb->s_mount_opt & OCFS2_MOUNT_BARRIER)
Linus Torvaldsf8cae0f2010-10-22 19:30:38 -0700190 blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL);
Hisashi Hifumie04cc152009-06-09 16:47:45 +0900191 goto bail;
Jan Kara04eda1a2010-08-05 20:32:45 +0200192 }
Hisashi Hifumie04cc152009-06-09 16:47:45 +0900193
Mark Fashehccd979b2005-12-15 14:31:24 -0800194 journal = osb->journal->j_journal;
Joel Becker2b4e30f2008-09-03 20:03:41 -0700195 err = jbd2_journal_force_commit(journal);
Mark Fashehccd979b2005-12-15 14:31:24 -0800196
197bail:
198 mlog_exit(err);
199
200 return (err < 0) ? -EIO : 0;
201}
202
Tiger Yang7f1a37e2006-11-15 15:48:42 +0800203int ocfs2_should_update_atime(struct inode *inode,
204 struct vfsmount *vfsmnt)
205{
206 struct timespec now;
207 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
208
209 if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
210 return 0;
211
212 if ((inode->i_flags & S_NOATIME) ||
213 ((inode->i_sb->s_flags & MS_NODIRATIME) && S_ISDIR(inode->i_mode)))
214 return 0;
215
Mark Fasheh6c2aad02006-12-19 15:25:52 -0800216 /*
217 * We can be called with no vfsmnt structure - NFSD will
218 * sometimes do this.
219 *
220 * Note that our action here is different than touch_atime() -
221 * if we can't tell whether this is a noatime mount, then we
222 * don't know whether to trust the value of s_atime_quantum.
223 */
224 if (vfsmnt == NULL)
225 return 0;
226
Tiger Yang7f1a37e2006-11-15 15:48:42 +0800227 if ((vfsmnt->mnt_flags & MNT_NOATIME) ||
228 ((vfsmnt->mnt_flags & MNT_NODIRATIME) && S_ISDIR(inode->i_mode)))
229 return 0;
230
Mark Fasheh7e913c52006-12-13 00:34:35 -0800231 if (vfsmnt->mnt_flags & MNT_RELATIME) {
232 if ((timespec_compare(&inode->i_atime, &inode->i_mtime) <= 0) ||
233 (timespec_compare(&inode->i_atime, &inode->i_ctime) <= 0))
234 return 1;
235
236 return 0;
237 }
238
Tiger Yang7f1a37e2006-11-15 15:48:42 +0800239 now = CURRENT_TIME;
240 if ((now.tv_sec - inode->i_atime.tv_sec <= osb->s_atime_quantum))
241 return 0;
242 else
243 return 1;
244}
245
246int ocfs2_update_inode_atime(struct inode *inode,
247 struct buffer_head *bh)
248{
249 int ret;
250 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
251 handle_t *handle;
Mark Fashehc11e9fa2007-07-20 11:24:53 -0700252 struct ocfs2_dinode *di = (struct ocfs2_dinode *) bh->b_data;
Tiger Yang7f1a37e2006-11-15 15:48:42 +0800253
254 mlog_entry_void();
255
256 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
Jan Karafa38e922008-10-20 19:23:51 +0200257 if (IS_ERR(handle)) {
258 ret = PTR_ERR(handle);
Tiger Yang7f1a37e2006-11-15 15:48:42 +0800259 mlog_errno(ret);
260 goto out;
261 }
262
Joel Becker0cf2f762009-02-12 16:41:25 -0800263 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
Joel Becker13723d02008-10-17 19:25:01 -0700264 OCFS2_JOURNAL_ACCESS_WRITE);
Mark Fashehc11e9fa2007-07-20 11:24:53 -0700265 if (ret) {
266 mlog_errno(ret);
267 goto out_commit;
268 }
269
270 /*
271 * Don't use ocfs2_mark_inode_dirty() here as we don't always
272 * have i_mutex to guard against concurrent changes to other
273 * inode fields.
274 */
Tiger Yang7f1a37e2006-11-15 15:48:42 +0800275 inode->i_atime = CURRENT_TIME;
Mark Fashehc11e9fa2007-07-20 11:24:53 -0700276 di->i_atime = cpu_to_le64(inode->i_atime.tv_sec);
277 di->i_atime_nsec = cpu_to_le32(inode->i_atime.tv_nsec);
Joel Beckerec20cec2010-03-19 14:13:52 -0700278 ocfs2_journal_dirty(handle, bh);
Tiger Yang7f1a37e2006-11-15 15:48:42 +0800279
Mark Fashehc11e9fa2007-07-20 11:24:53 -0700280out_commit:
Tiger Yang7f1a37e2006-11-15 15:48:42 +0800281 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
282out:
283 mlog_exit(ret);
284 return ret;
285}
286
Adrian Bunk6cb129f2007-04-26 00:29:35 -0700287static int ocfs2_set_inode_size(handle_t *handle,
288 struct inode *inode,
289 struct buffer_head *fe_bh,
290 u64 new_i_size)
Mark Fashehccd979b2005-12-15 14:31:24 -0800291{
292 int status;
293
294 mlog_entry_void();
295 i_size_write(inode, new_i_size);
Mark Fasheh8110b072007-03-22 16:53:23 -0700296 inode->i_blocks = ocfs2_inode_sector_count(inode);
Mark Fashehccd979b2005-12-15 14:31:24 -0800297 inode->i_ctime = inode->i_mtime = CURRENT_TIME;
298
299 status = ocfs2_mark_inode_dirty(handle, inode, fe_bh);
300 if (status < 0) {
301 mlog_errno(status);
302 goto bail;
303 }
304
305bail:
306 mlog_exit(status);
307 return status;
308}
309
Jan Kara9e33d692008-08-25 19:56:50 +0200310int ocfs2_simple_size_update(struct inode *inode,
311 struct buffer_head *di_bh,
312 u64 new_i_size)
Mark Fashehccd979b2005-12-15 14:31:24 -0800313{
314 int ret;
315 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
Mark Fasheh1fabe142006-10-09 18:11:45 -0700316 handle_t *handle = NULL;
Mark Fashehccd979b2005-12-15 14:31:24 -0800317
Mark Fasheh65eff9c2006-10-09 17:26:22 -0700318 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
Jan Karafa38e922008-10-20 19:23:51 +0200319 if (IS_ERR(handle)) {
320 ret = PTR_ERR(handle);
Mark Fashehccd979b2005-12-15 14:31:24 -0800321 mlog_errno(ret);
322 goto out;
323 }
324
325 ret = ocfs2_set_inode_size(handle, inode, di_bh,
326 new_i_size);
327 if (ret < 0)
328 mlog_errno(ret);
329
Mark Fasheh02dc1af2006-10-09 16:48:10 -0700330 ocfs2_commit_trans(osb, handle);
Mark Fashehccd979b2005-12-15 14:31:24 -0800331out:
332 return ret;
333}
334
Tao Ma37f8a2b2009-08-26 09:47:28 +0800335static int ocfs2_cow_file_pos(struct inode *inode,
336 struct buffer_head *fe_bh,
337 u64 offset)
338{
339 int status;
340 u32 phys, cpos = offset >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
341 unsigned int num_clusters = 0;
342 unsigned int ext_flags = 0;
343
344 /*
345 * If the new offset is aligned to the range of the cluster, there is
346 * no space for ocfs2_zero_range_for_truncate to fill, so no need to
347 * CoW either.
348 */
349 if ((offset & (OCFS2_SB(inode->i_sb)->s_clustersize - 1)) == 0)
350 return 0;
351
352 status = ocfs2_get_clusters(inode, cpos, &phys,
353 &num_clusters, &ext_flags);
354 if (status) {
355 mlog_errno(status);
356 goto out;
357 }
358
359 if (!(ext_flags & OCFS2_EXT_REFCOUNTED))
360 goto out;
361
Tao Ma15502712010-08-12 10:36:38 +0800362 return ocfs2_refcount_cow(inode, NULL, fe_bh, cpos, 1, cpos+1);
Tao Ma37f8a2b2009-08-26 09:47:28 +0800363
364out:
365 return status;
366}
367
Mark Fashehccd979b2005-12-15 14:31:24 -0800368static int ocfs2_orphan_for_truncate(struct ocfs2_super *osb,
369 struct inode *inode,
370 struct buffer_head *fe_bh,
371 u64 new_i_size)
372{
373 int status;
Mark Fasheh1fabe142006-10-09 18:11:45 -0700374 handle_t *handle;
Mark Fasheh60b11392007-02-16 11:46:50 -0800375 struct ocfs2_dinode *di;
Mark Fasheh35edec12007-07-06 14:41:18 -0700376 u64 cluster_bytes;
Mark Fashehccd979b2005-12-15 14:31:24 -0800377
378 mlog_entry_void();
379
Tao Ma37f8a2b2009-08-26 09:47:28 +0800380 /*
381 * We need to CoW the cluster contains the offset if it is reflinked
382 * since we will call ocfs2_zero_range_for_truncate later which will
383 * write "0" from offset to the end of the cluster.
384 */
385 status = ocfs2_cow_file_pos(inode, fe_bh, new_i_size);
386 if (status) {
387 mlog_errno(status);
388 return status;
389 }
390
Mark Fashehccd979b2005-12-15 14:31:24 -0800391 /* TODO: This needs to actually orphan the inode in this
392 * transaction. */
393
Mark Fasheh65eff9c2006-10-09 17:26:22 -0700394 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
Mark Fashehccd979b2005-12-15 14:31:24 -0800395 if (IS_ERR(handle)) {
396 status = PTR_ERR(handle);
397 mlog_errno(status);
398 goto out;
399 }
400
Joel Becker0cf2f762009-02-12 16:41:25 -0800401 status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), fe_bh,
Joel Becker13723d02008-10-17 19:25:01 -0700402 OCFS2_JOURNAL_ACCESS_WRITE);
Mark Fasheh60b11392007-02-16 11:46:50 -0800403 if (status < 0) {
404 mlog_errno(status);
405 goto out_commit;
406 }
407
408 /*
409 * Do this before setting i_size.
410 */
Mark Fasheh35edec12007-07-06 14:41:18 -0700411 cluster_bytes = ocfs2_align_bytes_to_clusters(inode->i_sb, new_i_size);
412 status = ocfs2_zero_range_for_truncate(inode, handle, new_i_size,
413 cluster_bytes);
Mark Fasheh60b11392007-02-16 11:46:50 -0800414 if (status) {
415 mlog_errno(status);
416 goto out_commit;
417 }
418
419 i_size_write(inode, new_i_size);
Mark Fasheh60b11392007-02-16 11:46:50 -0800420 inode->i_ctime = inode->i_mtime = CURRENT_TIME;
421
422 di = (struct ocfs2_dinode *) fe_bh->b_data;
423 di->i_size = cpu_to_le64(new_i_size);
424 di->i_ctime = di->i_mtime = cpu_to_le64(inode->i_ctime.tv_sec);
425 di->i_ctime_nsec = di->i_mtime_nsec = cpu_to_le32(inode->i_ctime.tv_nsec);
426
Joel Beckerec20cec2010-03-19 14:13:52 -0700427 ocfs2_journal_dirty(handle, fe_bh);
Mark Fashehccd979b2005-12-15 14:31:24 -0800428
Mark Fasheh60b11392007-02-16 11:46:50 -0800429out_commit:
Mark Fasheh02dc1af2006-10-09 16:48:10 -0700430 ocfs2_commit_trans(osb, handle);
Mark Fashehccd979b2005-12-15 14:31:24 -0800431out:
Mark Fasheh60b11392007-02-16 11:46:50 -0800432
Mark Fashehccd979b2005-12-15 14:31:24 -0800433 mlog_exit(status);
434 return status;
435}
436
437static int ocfs2_truncate_file(struct inode *inode,
438 struct buffer_head *di_bh,
439 u64 new_i_size)
440{
441 int status = 0;
442 struct ocfs2_dinode *fe = NULL;
443 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
Mark Fashehccd979b2005-12-15 14:31:24 -0800444
Mark Fashehb06970532006-03-03 10:24:33 -0800445 mlog_entry("(inode = %llu, new_i_size = %llu\n",
446 (unsigned long long)OCFS2_I(inode)->ip_blkno,
447 (unsigned long long)new_i_size);
Mark Fashehccd979b2005-12-15 14:31:24 -0800448
Joel Beckerb657c952008-11-13 14:49:11 -0800449 /* We trust di_bh because it comes from ocfs2_inode_lock(), which
450 * already validated it */
Mark Fashehccd979b2005-12-15 14:31:24 -0800451 fe = (struct ocfs2_dinode *) di_bh->b_data;
Mark Fashehccd979b2005-12-15 14:31:24 -0800452
453 mlog_bug_on_msg(le64_to_cpu(fe->i_size) != i_size_read(inode),
Mark Fashehb06970532006-03-03 10:24:33 -0800454 "Inode %llu, inode i_size = %lld != di "
455 "i_size = %llu, i_flags = 0x%x\n",
456 (unsigned long long)OCFS2_I(inode)->ip_blkno,
Mark Fashehccd979b2005-12-15 14:31:24 -0800457 i_size_read(inode),
Mark Fashehb06970532006-03-03 10:24:33 -0800458 (unsigned long long)le64_to_cpu(fe->i_size),
459 le32_to_cpu(fe->i_flags));
Mark Fashehccd979b2005-12-15 14:31:24 -0800460
461 if (new_i_size > le64_to_cpu(fe->i_size)) {
Mark Fashehb06970532006-03-03 10:24:33 -0800462 mlog(0, "asked to truncate file with size (%llu) to size (%llu)!\n",
463 (unsigned long long)le64_to_cpu(fe->i_size),
464 (unsigned long long)new_i_size);
Mark Fashehccd979b2005-12-15 14:31:24 -0800465 status = -EINVAL;
466 mlog_errno(status);
467 goto bail;
468 }
469
Mark Fashehb06970532006-03-03 10:24:33 -0800470 mlog(0, "inode %llu, i_size = %llu, new_i_size = %llu\n",
471 (unsigned long long)le64_to_cpu(fe->i_blkno),
472 (unsigned long long)le64_to_cpu(fe->i_size),
473 (unsigned long long)new_i_size);
Mark Fashehccd979b2005-12-15 14:31:24 -0800474
475 /* lets handle the simple truncate cases before doing any more
476 * cluster locking. */
477 if (new_i_size == le64_to_cpu(fe->i_size))
478 goto bail;
479
Mark Fasheh2e89b2e2007-05-09 13:40:18 -0700480 down_write(&OCFS2_I(inode)->ip_alloc_sem);
481
Mark Fasheh4fe370a2009-12-07 13:15:40 -0800482 ocfs2_resv_discard(&osb->osb_la_resmap,
483 &OCFS2_I(inode)->ip_la_data_resv);
484
Mark Fashehc934a922007-10-18 15:23:46 -0700485 /*
486 * The inode lock forced other nodes to sync and drop their
487 * pages, which (correctly) happens even if we have a truncate
488 * without allocation change - ocfs2 cluster sizes can be much
489 * greater than page size, so we have to truncate them
490 * anyway.
491 */
Mark Fasheh2e89b2e2007-05-09 13:40:18 -0700492 unmap_mapping_range(inode->i_mapping, new_i_size + PAGE_SIZE - 1, 0, 1);
493 truncate_inode_pages(inode->i_mapping, new_i_size);
494
Mark Fasheh1afc32b2007-09-07 14:46:51 -0700495 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
496 status = ocfs2_truncate_inline(inode, di_bh, new_i_size,
Mark Fashehb1967d02007-11-20 11:56:39 -0800497 i_size_read(inode), 1);
Mark Fasheh1afc32b2007-09-07 14:46:51 -0700498 if (status)
499 mlog_errno(status);
500
Mark Fashehc934a922007-10-18 15:23:46 -0700501 goto bail_unlock_sem;
Mark Fasheh1afc32b2007-09-07 14:46:51 -0700502 }
503
Mark Fashehccd979b2005-12-15 14:31:24 -0800504 /* alright, we're going to need to do a full blown alloc size
505 * change. Orphan the inode so that recovery can complete the
506 * truncate if necessary. This does the task of marking
507 * i_size. */
508 status = ocfs2_orphan_for_truncate(osb, inode, di_bh, new_i_size);
509 if (status < 0) {
510 mlog_errno(status);
Mark Fashehc934a922007-10-18 15:23:46 -0700511 goto bail_unlock_sem;
Mark Fashehccd979b2005-12-15 14:31:24 -0800512 }
513
Tristan Ye78f94672010-05-11 17:54:42 +0800514 status = ocfs2_commit_truncate(osb, inode, di_bh);
Mark Fashehccd979b2005-12-15 14:31:24 -0800515 if (status < 0) {
516 mlog_errno(status);
Mark Fashehc934a922007-10-18 15:23:46 -0700517 goto bail_unlock_sem;
Mark Fashehccd979b2005-12-15 14:31:24 -0800518 }
519
520 /* TODO: orphan dir cleanup here. */
Mark Fashehc934a922007-10-18 15:23:46 -0700521bail_unlock_sem:
Mark Fasheh2e89b2e2007-05-09 13:40:18 -0700522 up_write(&OCFS2_I(inode)->ip_alloc_sem);
523
Mark Fashehccd979b2005-12-15 14:31:24 -0800524bail:
Tao Ma8b2c0db2009-08-18 11:43:49 +0800525 if (!status && OCFS2_I(inode)->ip_clusters == 0)
526 status = ocfs2_try_remove_refcount_tree(inode, di_bh);
Mark Fashehccd979b2005-12-15 14:31:24 -0800527
528 mlog_exit(status);
529 return status;
530}
531
532/*
Tao Ma0eb8d47e2008-08-18 17:38:45 +0800533 * extend file allocation only here.
Mark Fashehccd979b2005-12-15 14:31:24 -0800534 * we'll update all the disk stuff, and oip->alloc_size
535 *
536 * expect stuff to be locked, a transaction started and enough data /
537 * metadata reservations in the contexts.
538 *
539 * Will return -EAGAIN, and a reason if a restart is needed.
540 * If passed in, *reason will always be set, even in error.
541 */
Tao Ma0eb8d47e2008-08-18 17:38:45 +0800542int ocfs2_add_inode_data(struct ocfs2_super *osb,
543 struct inode *inode,
544 u32 *logical_offset,
545 u32 clusters_to_add,
546 int mark_unwritten,
547 struct buffer_head *fe_bh,
548 handle_t *handle,
549 struct ocfs2_alloc_context *data_ac,
550 struct ocfs2_alloc_context *meta_ac,
551 enum ocfs2_alloc_restarted *reason_ret)
Mark Fashehccd979b2005-12-15 14:31:24 -0800552{
Joel Beckerf99b9b72008-08-20 19:36:33 -0700553 int ret;
554 struct ocfs2_extent_tree et;
Mark Fashehccd979b2005-12-15 14:31:24 -0800555
Joel Becker5e404e92009-02-13 03:54:22 -0800556 ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), fe_bh);
Joel Beckercbee7e12009-02-13 03:34:15 -0800557 ret = ocfs2_add_clusters_in_btree(handle, &et, logical_offset,
558 clusters_to_add, mark_unwritten,
559 data_ac, meta_ac, reason_ret);
Joel Beckerf99b9b72008-08-20 19:36:33 -0700560
561 return ret;
Mark Fashehccd979b2005-12-15 14:31:24 -0800562}
563
Mark Fasheh2ae99a62007-03-09 16:43:28 -0800564static int __ocfs2_extend_allocation(struct inode *inode, u32 logical_start,
565 u32 clusters_to_add, int mark_unwritten)
Mark Fashehccd979b2005-12-15 14:31:24 -0800566{
567 int status = 0;
568 int restart_func = 0;
Mark Fashehabf8b152007-01-17 13:07:24 -0800569 int credits;
Mark Fasheh2ae99a62007-03-09 16:43:28 -0800570 u32 prev_clusters;
Mark Fashehccd979b2005-12-15 14:31:24 -0800571 struct buffer_head *bh = NULL;
572 struct ocfs2_dinode *fe = NULL;
Mark Fasheh1fabe142006-10-09 18:11:45 -0700573 handle_t *handle = NULL;
Mark Fashehccd979b2005-12-15 14:31:24 -0800574 struct ocfs2_alloc_context *data_ac = NULL;
575 struct ocfs2_alloc_context *meta_ac = NULL;
576 enum ocfs2_alloc_restarted why;
577 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
Joel Beckerf99b9b72008-08-20 19:36:33 -0700578 struct ocfs2_extent_tree et;
Jan Karaa90714c2008-10-09 19:38:40 +0200579 int did_quota = 0;
Mark Fashehccd979b2005-12-15 14:31:24 -0800580
581 mlog_entry("(clusters_to_add = %u)\n", clusters_to_add);
582
Mark Fashehdcd05382007-01-16 11:32:23 -0800583 /*
584 * This function only exists for file systems which don't
585 * support holes.
586 */
Mark Fasheh2ae99a62007-03-09 16:43:28 -0800587 BUG_ON(mark_unwritten && !ocfs2_sparse_alloc(osb));
Mark Fashehdcd05382007-01-16 11:32:23 -0800588
Joel Beckerb657c952008-11-13 14:49:11 -0800589 status = ocfs2_read_inode_block(inode, &bh);
Mark Fashehccd979b2005-12-15 14:31:24 -0800590 if (status < 0) {
591 mlog_errno(status);
592 goto leave;
593 }
Mark Fashehccd979b2005-12-15 14:31:24 -0800594 fe = (struct ocfs2_dinode *) bh->b_data;
Mark Fashehccd979b2005-12-15 14:31:24 -0800595
596restart_all:
597 BUG_ON(le32_to_cpu(fe->i_clusters) != OCFS2_I(inode)->ip_clusters);
598
Tao Mae7d4cb62008-08-18 17:38:44 +0800599 mlog(0, "extend inode %llu, i_size = %lld, di->i_clusters = %u, "
600 "clusters_to_add = %u\n",
601 (unsigned long long)OCFS2_I(inode)->ip_blkno,
602 (long long)i_size_read(inode), le32_to_cpu(fe->i_clusters),
603 clusters_to_add);
Joel Becker5e404e92009-02-13 03:54:22 -0800604 ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), bh);
Joel Beckerf99b9b72008-08-20 19:36:33 -0700605 status = ocfs2_lock_allocators(inode, &et, clusters_to_add, 0,
606 &data_ac, &meta_ac);
Mark Fasheh9517bac2007-02-09 20:24:12 -0800607 if (status) {
608 mlog_errno(status);
609 goto leave;
610 }
611
Tao Ma811f9332008-08-18 17:38:43 +0800612 credits = ocfs2_calc_extend_credits(osb->sb, &fe->id2.i_list,
613 clusters_to_add);
Mark Fasheh65eff9c2006-10-09 17:26:22 -0700614 handle = ocfs2_start_trans(osb, credits);
Mark Fashehccd979b2005-12-15 14:31:24 -0800615 if (IS_ERR(handle)) {
616 status = PTR_ERR(handle);
617 handle = NULL;
618 mlog_errno(status);
619 goto leave;
620 }
621
622restarted_transaction:
Christoph Hellwig5dd40562010-03-03 09:05:00 -0500623 status = dquot_alloc_space_nodirty(inode,
624 ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
625 if (status)
Jan Karaa90714c2008-10-09 19:38:40 +0200626 goto leave;
Jan Karaa90714c2008-10-09 19:38:40 +0200627 did_quota = 1;
628
Mark Fashehccd979b2005-12-15 14:31:24 -0800629 /* reserve a write to the file entry early on - that we if we
630 * run out of credits in the allocation path, we can still
631 * update i_size. */
Joel Becker0cf2f762009-02-12 16:41:25 -0800632 status = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
Joel Becker13723d02008-10-17 19:25:01 -0700633 OCFS2_JOURNAL_ACCESS_WRITE);
Mark Fashehccd979b2005-12-15 14:31:24 -0800634 if (status < 0) {
635 mlog_errno(status);
636 goto leave;
637 }
638
639 prev_clusters = OCFS2_I(inode)->ip_clusters;
640
Tao Ma0eb8d47e2008-08-18 17:38:45 +0800641 status = ocfs2_add_inode_data(osb,
642 inode,
643 &logical_start,
644 clusters_to_add,
645 mark_unwritten,
646 bh,
647 handle,
648 data_ac,
649 meta_ac,
650 &why);
Mark Fashehccd979b2005-12-15 14:31:24 -0800651 if ((status < 0) && (status != -EAGAIN)) {
652 if (status != -ENOSPC)
653 mlog_errno(status);
654 goto leave;
655 }
656
Joel Beckerec20cec2010-03-19 14:13:52 -0700657 ocfs2_journal_dirty(handle, bh);
Mark Fashehccd979b2005-12-15 14:31:24 -0800658
659 spin_lock(&OCFS2_I(inode)->ip_lock);
660 clusters_to_add -= (OCFS2_I(inode)->ip_clusters - prev_clusters);
661 spin_unlock(&OCFS2_I(inode)->ip_lock);
Jan Karaa90714c2008-10-09 19:38:40 +0200662 /* Release unused quota reservation */
Christoph Hellwig5dd40562010-03-03 09:05:00 -0500663 dquot_free_space(inode,
Jan Karaa90714c2008-10-09 19:38:40 +0200664 ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
665 did_quota = 0;
Mark Fashehccd979b2005-12-15 14:31:24 -0800666
667 if (why != RESTART_NONE && clusters_to_add) {
668 if (why == RESTART_META) {
669 mlog(0, "restarting function.\n");
670 restart_func = 1;
Tao Ma79681842010-04-16 13:59:25 +0800671 status = 0;
Mark Fashehccd979b2005-12-15 14:31:24 -0800672 } else {
673 BUG_ON(why != RESTART_TRANS);
674
675 mlog(0, "restarting transaction.\n");
676 /* TODO: This can be more intelligent. */
677 credits = ocfs2_calc_extend_credits(osb->sb,
Tao Ma811f9332008-08-18 17:38:43 +0800678 &fe->id2.i_list,
Mark Fashehccd979b2005-12-15 14:31:24 -0800679 clusters_to_add);
Mark Fasheh1fabe142006-10-09 18:11:45 -0700680 status = ocfs2_extend_trans(handle, credits);
Mark Fashehccd979b2005-12-15 14:31:24 -0800681 if (status < 0) {
682 /* handle still has to be committed at
683 * this point. */
684 status = -ENOMEM;
685 mlog_errno(status);
686 goto leave;
687 }
688 goto restarted_transaction;
689 }
690 }
691
Mark Fashehb06970532006-03-03 10:24:33 -0800692 mlog(0, "fe: i_clusters = %u, i_size=%llu\n",
Mark Fasheh1ca1a112007-04-27 16:01:25 -0700693 le32_to_cpu(fe->i_clusters),
694 (unsigned long long)le64_to_cpu(fe->i_size));
Mark Fashehccd979b2005-12-15 14:31:24 -0800695 mlog(0, "inode: ip_clusters=%u, i_size=%lld\n",
Jan Kara634bf742007-12-19 15:25:42 +0100696 OCFS2_I(inode)->ip_clusters, (long long)i_size_read(inode));
Mark Fashehccd979b2005-12-15 14:31:24 -0800697
698leave:
Jan Karaa90714c2008-10-09 19:38:40 +0200699 if (status < 0 && did_quota)
Christoph Hellwig5dd40562010-03-03 09:05:00 -0500700 dquot_free_space(inode,
Jan Karaa90714c2008-10-09 19:38:40 +0200701 ocfs2_clusters_to_bytes(osb->sb, clusters_to_add));
Mark Fashehccd979b2005-12-15 14:31:24 -0800702 if (handle) {
Mark Fasheh02dc1af2006-10-09 16:48:10 -0700703 ocfs2_commit_trans(osb, handle);
Mark Fashehccd979b2005-12-15 14:31:24 -0800704 handle = NULL;
705 }
706 if (data_ac) {
707 ocfs2_free_alloc_context(data_ac);
708 data_ac = NULL;
709 }
710 if (meta_ac) {
711 ocfs2_free_alloc_context(meta_ac);
712 meta_ac = NULL;
713 }
714 if ((!status) && restart_func) {
715 restart_func = 0;
716 goto restart_all;
717 }
Mark Fasheha81cb882008-10-07 14:25:16 -0700718 brelse(bh);
719 bh = NULL;
Mark Fashehccd979b2005-12-15 14:31:24 -0800720
721 mlog_exit(status);
722 return status;
723}
724
Joel Beckera4bfb4c2010-07-06 14:36:06 -0700725/*
726 * While a write will already be ordering the data, a truncate will not.
727 * Thus, we need to explicitly order the zeroed pages.
728 */
729static handle_t *ocfs2_zero_start_ordered_transaction(struct inode *inode)
730{
731 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
732 handle_t *handle = NULL;
733 int ret = 0;
734
735 if (!ocfs2_should_order_data(inode))
736 goto out;
737
738 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
739 if (IS_ERR(handle)) {
740 ret = -ENOMEM;
741 mlog_errno(ret);
742 goto out;
743 }
744
745 ret = ocfs2_jbd2_file_inode(handle, inode);
746 if (ret < 0)
747 mlog_errno(ret);
748
749out:
750 if (ret) {
751 if (!IS_ERR(handle))
752 ocfs2_commit_trans(osb, handle);
753 handle = ERR_PTR(ret);
754 }
755 return handle;
756}
757
Mark Fashehccd979b2005-12-15 14:31:24 -0800758/* Some parts of this taken from generic_cont_expand, which turned out
759 * to be too fragile to do exactly what we need without us having to
Nick Piggin4e02ed42008-10-29 14:00:55 -0700760 * worry about recursive locking in ->write_begin() and ->write_end(). */
Joel Beckera4bfb4c2010-07-06 14:36:06 -0700761static int ocfs2_write_zero_page(struct inode *inode, u64 abs_from,
762 u64 abs_to)
Mark Fashehccd979b2005-12-15 14:31:24 -0800763{
764 struct address_space *mapping = inode->i_mapping;
765 struct page *page;
Joel Beckera4bfb4c2010-07-06 14:36:06 -0700766 unsigned long index = abs_from >> PAGE_CACHE_SHIFT;
Mark Fasheh1fabe142006-10-09 18:11:45 -0700767 handle_t *handle = NULL;
Joel Becker54532582010-07-16 13:32:33 -0700768 int ret = 0;
Joel Beckera4bfb4c2010-07-06 14:36:06 -0700769 unsigned zero_from, zero_to, block_start, block_end;
Mark Fashehccd979b2005-12-15 14:31:24 -0800770
Joel Beckera4bfb4c2010-07-06 14:36:06 -0700771 BUG_ON(abs_from >= abs_to);
772 BUG_ON(abs_to > (((u64)index + 1) << PAGE_CACHE_SHIFT));
773 BUG_ON(abs_from & (inode->i_blkbits - 1));
Mark Fashehccd979b2005-12-15 14:31:24 -0800774
Jan Kara9b4c0ff2010-08-24 14:28:03 +0200775 page = find_or_create_page(mapping, index, GFP_NOFS);
Mark Fashehccd979b2005-12-15 14:31:24 -0800776 if (!page) {
777 ret = -ENOMEM;
778 mlog_errno(ret);
779 goto out;
780 }
781
Joel Beckera4bfb4c2010-07-06 14:36:06 -0700782 /* Get the offsets within the page that we want to zero */
783 zero_from = abs_from & (PAGE_CACHE_SIZE - 1);
784 zero_to = abs_to & (PAGE_CACHE_SIZE - 1);
785 if (!zero_to)
786 zero_to = PAGE_CACHE_SIZE;
Mark Fashehccd979b2005-12-15 14:31:24 -0800787
Joel Becker56934862010-07-01 15:13:31 -0700788 mlog(0,
789 "abs_from = %llu, abs_to = %llu, index = %lu, zero_from = %u, zero_to = %u\n",
790 (unsigned long long)abs_from, (unsigned long long)abs_to,
791 index, zero_from, zero_to);
792
Joel Beckera4bfb4c2010-07-06 14:36:06 -0700793 /* We know that zero_from is block aligned */
794 for (block_start = zero_from; block_start < zero_to;
795 block_start = block_end) {
796 block_end = block_start + (1 << inode->i_blkbits);
797
798 /*
Christoph Hellwigebdec242010-10-06 10:47:23 +0200799 * block_start is block-aligned. Bump it by one to force
800 * __block_write_begin and block_commit_write to zero the
Joel Beckera4bfb4c2010-07-06 14:36:06 -0700801 * whole block.
802 */
Christoph Hellwigebdec242010-10-06 10:47:23 +0200803 ret = __block_write_begin(page, block_start + 1, 0,
804 ocfs2_get_block);
Joel Beckera4bfb4c2010-07-06 14:36:06 -0700805 if (ret < 0) {
806 mlog_errno(ret);
Mark Fashehccd979b2005-12-15 14:31:24 -0800807 goto out_unlock;
808 }
Mark Fashehccd979b2005-12-15 14:31:24 -0800809
Joel Beckera4bfb4c2010-07-06 14:36:06 -0700810 if (!handle) {
811 handle = ocfs2_zero_start_ordered_transaction(inode);
812 if (IS_ERR(handle)) {
813 ret = PTR_ERR(handle);
814 handle = NULL;
815 break;
816 }
817 }
818
819 /* must not update i_size! */
820 ret = block_commit_write(page, block_start + 1,
821 block_start + 1);
822 if (ret < 0)
823 mlog_errno(ret);
824 else
825 ret = 0;
826 }
Mark Fashehccd979b2005-12-15 14:31:24 -0800827
828 if (handle)
Mark Fasheh02dc1af2006-10-09 16:48:10 -0700829 ocfs2_commit_trans(OCFS2_SB(inode->i_sb), handle);
Joel Beckera4bfb4c2010-07-06 14:36:06 -0700830
Mark Fashehccd979b2005-12-15 14:31:24 -0800831out_unlock:
832 unlock_page(page);
833 page_cache_release(page);
834out:
835 return ret;
836}
837
Joel Becker56934862010-07-01 15:13:31 -0700838/*
839 * Find the next range to zero. We do this in terms of bytes because
840 * that's what ocfs2_zero_extend() wants, and it is dealing with the
841 * pagecache. We may return multiple extents.
842 *
843 * zero_start and zero_end are ocfs2_zero_extend()s current idea of what
844 * needs to be zeroed. range_start and range_end return the next zeroing
845 * range. A subsequent call should pass the previous range_end as its
846 * zero_start. If range_end is 0, there's nothing to do.
847 *
848 * Unwritten extents are skipped over. Refcounted extents are CoWd.
849 */
850static int ocfs2_zero_extend_get_range(struct inode *inode,
851 struct buffer_head *di_bh,
852 u64 zero_start, u64 zero_end,
853 u64 *range_start, u64 *range_end)
Mark Fashehccd979b2005-12-15 14:31:24 -0800854{
Joel Becker56934862010-07-01 15:13:31 -0700855 int rc = 0, needs_cow = 0;
856 u32 p_cpos, zero_clusters = 0;
857 u32 zero_cpos =
858 zero_start >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
859 u32 last_cpos = ocfs2_clusters_for_bytes(inode->i_sb, zero_end);
860 unsigned int num_clusters = 0;
861 unsigned int ext_flags = 0;
Mark Fashehccd979b2005-12-15 14:31:24 -0800862
Joel Becker56934862010-07-01 15:13:31 -0700863 while (zero_cpos < last_cpos) {
864 rc = ocfs2_get_clusters(inode, zero_cpos, &p_cpos,
865 &num_clusters, &ext_flags);
866 if (rc) {
867 mlog_errno(rc);
Mark Fashehccd979b2005-12-15 14:31:24 -0800868 goto out;
869 }
870
Joel Becker56934862010-07-01 15:13:31 -0700871 if (p_cpos && !(ext_flags & OCFS2_EXT_UNWRITTEN)) {
872 zero_clusters = num_clusters;
873 if (ext_flags & OCFS2_EXT_REFCOUNTED)
874 needs_cow = 1;
875 break;
876 }
877
878 zero_cpos += num_clusters;
879 }
880 if (!zero_clusters) {
881 *range_end = 0;
882 goto out;
883 }
884
885 while ((zero_cpos + zero_clusters) < last_cpos) {
886 rc = ocfs2_get_clusters(inode, zero_cpos + zero_clusters,
887 &p_cpos, &num_clusters,
888 &ext_flags);
889 if (rc) {
890 mlog_errno(rc);
891 goto out;
892 }
893
894 if (!p_cpos || (ext_flags & OCFS2_EXT_UNWRITTEN))
895 break;
896 if (ext_flags & OCFS2_EXT_REFCOUNTED)
897 needs_cow = 1;
898 zero_clusters += num_clusters;
899 }
900 if ((zero_cpos + zero_clusters) > last_cpos)
901 zero_clusters = last_cpos - zero_cpos;
902
903 if (needs_cow) {
Tao Ma15502712010-08-12 10:36:38 +0800904 rc = ocfs2_refcount_cow(inode, NULL, di_bh, zero_cpos,
905 zero_clusters, UINT_MAX);
Joel Becker56934862010-07-01 15:13:31 -0700906 if (rc) {
907 mlog_errno(rc);
908 goto out;
909 }
910 }
911
912 *range_start = ocfs2_clusters_to_bytes(inode->i_sb, zero_cpos);
913 *range_end = ocfs2_clusters_to_bytes(inode->i_sb,
914 zero_cpos + zero_clusters);
915
916out:
917 return rc;
918}
919
920/*
921 * Zero one range returned from ocfs2_zero_extend_get_range(). The caller
922 * has made sure that the entire range needs zeroing.
923 */
924static int ocfs2_zero_extend_range(struct inode *inode, u64 range_start,
925 u64 range_end)
926{
927 int rc = 0;
928 u64 next_pos;
929 u64 zero_pos = range_start;
930
931 mlog(0, "range_start = %llu, range_end = %llu\n",
932 (unsigned long long)range_start,
933 (unsigned long long)range_end);
934 BUG_ON(range_start >= range_end);
935
936 while (zero_pos < range_end) {
937 next_pos = (zero_pos & PAGE_CACHE_MASK) + PAGE_CACHE_SIZE;
938 if (next_pos > range_end)
939 next_pos = range_end;
940 rc = ocfs2_write_zero_page(inode, zero_pos, next_pos);
941 if (rc < 0) {
942 mlog_errno(rc);
943 break;
944 }
945 zero_pos = next_pos;
Mark Fashehe2057c52006-10-03 17:53:05 -0700946
947 /*
948 * Very large extends have the potential to lock up
949 * the cpu for extended periods of time.
950 */
951 cond_resched();
Mark Fashehccd979b2005-12-15 14:31:24 -0800952 }
953
Joel Becker56934862010-07-01 15:13:31 -0700954 return rc;
955}
956
957int ocfs2_zero_extend(struct inode *inode, struct buffer_head *di_bh,
958 loff_t zero_to_size)
959{
960 int ret = 0;
961 u64 zero_start, range_start = 0, range_end = 0;
962 struct super_block *sb = inode->i_sb;
963
964 zero_start = ocfs2_align_bytes_to_blocks(sb, i_size_read(inode));
965 mlog(0, "zero_start %llu for i_size %llu\n",
966 (unsigned long long)zero_start,
967 (unsigned long long)i_size_read(inode));
968 while (zero_start < zero_to_size) {
969 ret = ocfs2_zero_extend_get_range(inode, di_bh, zero_start,
970 zero_to_size,
971 &range_start,
972 &range_end);
973 if (ret) {
974 mlog_errno(ret);
975 break;
976 }
977 if (!range_end)
978 break;
979 /* Trim the ends */
980 if (range_start < zero_start)
981 range_start = zero_start;
982 if (range_end > zero_to_size)
983 range_end = zero_to_size;
984
985 ret = ocfs2_zero_extend_range(inode, range_start,
986 range_end);
987 if (ret) {
988 mlog_errno(ret);
989 break;
990 }
991 zero_start = range_end;
992 }
993
Mark Fashehccd979b2005-12-15 14:31:24 -0800994 return ret;
995}
996
Joel Becker56934862010-07-01 15:13:31 -0700997int ocfs2_extend_no_holes(struct inode *inode, struct buffer_head *di_bh,
998 u64 new_i_size, u64 zero_to)
Mark Fasheh65ed39d2007-08-28 17:13:23 -0700999{
1000 int ret;
1001 u32 clusters_to_add;
1002 struct ocfs2_inode_info *oi = OCFS2_I(inode);
1003
Joel Becker56934862010-07-01 15:13:31 -07001004 /*
1005 * Only quota files call this without a bh, and they can't be
1006 * refcounted.
1007 */
1008 BUG_ON(!di_bh && (oi->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL));
1009 BUG_ON(!di_bh && !(oi->ip_flags & OCFS2_INODE_SYSTEM_FILE));
1010
Mark Fasheh65ed39d2007-08-28 17:13:23 -07001011 clusters_to_add = ocfs2_clusters_for_bytes(inode->i_sb, new_i_size);
1012 if (clusters_to_add < oi->ip_clusters)
1013 clusters_to_add = 0;
1014 else
1015 clusters_to_add -= oi->ip_clusters;
1016
1017 if (clusters_to_add) {
1018 ret = __ocfs2_extend_allocation(inode, oi->ip_clusters,
1019 clusters_to_add, 0);
1020 if (ret) {
1021 mlog_errno(ret);
1022 goto out;
1023 }
1024 }
1025
1026 /*
1027 * Call this even if we don't add any clusters to the tree. We
1028 * still need to zero the area between the old i_size and the
1029 * new i_size.
1030 */
Joel Becker56934862010-07-01 15:13:31 -07001031 ret = ocfs2_zero_extend(inode, di_bh, zero_to);
Mark Fasheh65ed39d2007-08-28 17:13:23 -07001032 if (ret < 0)
1033 mlog_errno(ret);
1034
1035out:
1036 return ret;
1037}
1038
Mark Fashehccd979b2005-12-15 14:31:24 -08001039static int ocfs2_extend_file(struct inode *inode,
1040 struct buffer_head *di_bh,
Mark Fasheh65ed39d2007-08-28 17:13:23 -07001041 u64 new_i_size)
Mark Fashehccd979b2005-12-15 14:31:24 -08001042{
Mark Fashehc934a922007-10-18 15:23:46 -07001043 int ret = 0;
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001044 struct ocfs2_inode_info *oi = OCFS2_I(inode);
Mark Fashehccd979b2005-12-15 14:31:24 -08001045
Mark Fasheh65ed39d2007-08-28 17:13:23 -07001046 BUG_ON(!di_bh);
Mark Fasheh53013cb2006-05-05 19:04:03 -07001047
Mark Fashehccd979b2005-12-15 14:31:24 -08001048 /* setattr sometimes calls us like this. */
1049 if (new_i_size == 0)
1050 goto out;
1051
1052 if (i_size_read(inode) == new_i_size)
Joel Becker56934862010-07-01 15:13:31 -07001053 goto out;
Mark Fashehccd979b2005-12-15 14:31:24 -08001054 BUG_ON(new_i_size < i_size_read(inode));
1055
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001056 /*
Mark Fasheh65ed39d2007-08-28 17:13:23 -07001057 * The alloc sem blocks people in read/write from reading our
1058 * allocation until we're done changing it. We depend on
1059 * i_mutex to block other extend/truncate calls while we're
Joel Becker56934862010-07-01 15:13:31 -07001060 * here. We even have to hold it for sparse files because there
1061 * might be some tail zeroing.
Mark Fasheh0effef72006-10-03 17:44:42 -07001062 */
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001063 down_write(&oi->ip_alloc_sem);
1064
1065 if (oi->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1066 /*
1067 * We can optimize small extends by keeping the inodes
1068 * inline data.
1069 */
1070 if (ocfs2_size_fits_inline_data(di_bh, new_i_size)) {
1071 up_write(&oi->ip_alloc_sem);
1072 goto out_update_size;
1073 }
1074
1075 ret = ocfs2_convert_inline_data_to_extents(inode, di_bh);
1076 if (ret) {
1077 up_write(&oi->ip_alloc_sem);
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001078 mlog_errno(ret);
Mark Fashehc934a922007-10-18 15:23:46 -07001079 goto out;
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001080 }
1081 }
1082
Joel Becker56934862010-07-01 15:13:31 -07001083 if (ocfs2_sparse_alloc(OCFS2_SB(inode->i_sb)))
1084 ret = ocfs2_zero_extend(inode, di_bh, new_i_size);
1085 else
1086 ret = ocfs2_extend_no_holes(inode, di_bh, new_i_size,
1087 new_i_size);
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001088
1089 up_write(&oi->ip_alloc_sem);
Mark Fasheh65ed39d2007-08-28 17:13:23 -07001090
Mark Fasheh0effef72006-10-03 17:44:42 -07001091 if (ret < 0) {
1092 mlog_errno(ret);
Mark Fashehc934a922007-10-18 15:23:46 -07001093 goto out;
Mark Fashehccd979b2005-12-15 14:31:24 -08001094 }
1095
Mark Fasheh3a0782d2007-01-17 12:53:31 -08001096out_update_size:
Mark Fasheh65ed39d2007-08-28 17:13:23 -07001097 ret = ocfs2_simple_size_update(inode, di_bh, new_i_size);
1098 if (ret < 0)
1099 mlog_errno(ret);
Mark Fasheh53013cb2006-05-05 19:04:03 -07001100
Mark Fashehccd979b2005-12-15 14:31:24 -08001101out:
1102 return ret;
1103}
1104
1105int ocfs2_setattr(struct dentry *dentry, struct iattr *attr)
1106{
1107 int status = 0, size_change;
1108 struct inode *inode = dentry->d_inode;
1109 struct super_block *sb = inode->i_sb;
1110 struct ocfs2_super *osb = OCFS2_SB(sb);
1111 struct buffer_head *bh = NULL;
Mark Fasheh1fabe142006-10-09 18:11:45 -07001112 handle_t *handle = NULL;
Jan Kara65bac572009-06-02 14:24:01 +02001113 struct dquot *transfer_to[MAXQUOTAS] = { };
Jan Kara52a9ee22010-05-13 20:18:45 +02001114 int qtype;
Mark Fashehccd979b2005-12-15 14:31:24 -08001115
1116 mlog_entry("(0x%p, '%.*s')\n", dentry,
1117 dentry->d_name.len, dentry->d_name.name);
1118
Sunil Mushranbc535802008-04-18 10:23:53 -07001119 /* ensuring we don't even attempt to truncate a symlink */
1120 if (S_ISLNK(inode->i_mode))
1121 attr->ia_valid &= ~ATTR_SIZE;
1122
Mark Fashehccd979b2005-12-15 14:31:24 -08001123 if (attr->ia_valid & ATTR_MODE)
1124 mlog(0, "mode change: %d\n", attr->ia_mode);
1125 if (attr->ia_valid & ATTR_UID)
1126 mlog(0, "uid change: %d\n", attr->ia_uid);
1127 if (attr->ia_valid & ATTR_GID)
1128 mlog(0, "gid change: %d\n", attr->ia_gid);
1129 if (attr->ia_valid & ATTR_SIZE)
1130 mlog(0, "size change...\n");
1131 if (attr->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME))
1132 mlog(0, "time change...\n");
1133
1134#define OCFS2_VALID_ATTRS (ATTR_ATIME | ATTR_MTIME | ATTR_CTIME | ATTR_SIZE \
1135 | ATTR_GID | ATTR_UID | ATTR_MODE)
1136 if (!(attr->ia_valid & OCFS2_VALID_ATTRS)) {
1137 mlog(0, "can't handle attrs: 0x%x\n", attr->ia_valid);
1138 return 0;
1139 }
1140
1141 status = inode_change_ok(inode, attr);
1142 if (status)
1143 return status;
1144
Dmitry Monakhov12755622010-04-08 22:04:20 +04001145 if (is_quota_modification(inode, attr))
1146 dquot_initialize(inode);
Mark Fashehccd979b2005-12-15 14:31:24 -08001147 size_change = S_ISREG(inode->i_mode) && attr->ia_valid & ATTR_SIZE;
1148 if (size_change) {
1149 status = ocfs2_rw_lock(inode, 1);
1150 if (status < 0) {
1151 mlog_errno(status);
1152 goto bail;
1153 }
1154 }
1155
Mark Fashehe63aecb62007-10-18 15:30:42 -07001156 status = ocfs2_inode_lock(inode, &bh, 1);
Mark Fashehccd979b2005-12-15 14:31:24 -08001157 if (status < 0) {
1158 if (status != -ENOENT)
1159 mlog_errno(status);
1160 goto bail_unlock_rw;
1161 }
1162
1163 if (size_change && attr->ia_size != i_size_read(inode)) {
Wengang Wang5051f762010-02-26 18:18:25 +08001164 status = inode_newsize_ok(inode, attr->ia_size);
1165 if (status)
Mark Fashehce76fd32007-07-20 12:02:14 -07001166 goto bail_unlock;
Mark Fashehce76fd32007-07-20 12:02:14 -07001167
Joel Becker2b4e30f2008-09-03 20:03:41 -07001168 if (i_size_read(inode) > attr->ia_size) {
1169 if (ocfs2_should_order_data(inode)) {
1170 status = ocfs2_begin_ordered_truncate(inode,
1171 attr->ia_size);
1172 if (status)
1173 goto bail_unlock;
1174 }
Mark Fashehccd979b2005-12-15 14:31:24 -08001175 status = ocfs2_truncate_file(inode, bh, attr->ia_size);
Joel Becker2b4e30f2008-09-03 20:03:41 -07001176 } else
Mark Fasheh65ed39d2007-08-28 17:13:23 -07001177 status = ocfs2_extend_file(inode, bh, attr->ia_size);
Mark Fashehccd979b2005-12-15 14:31:24 -08001178 if (status < 0) {
1179 if (status != -ENOSPC)
1180 mlog_errno(status);
1181 status = -ENOSPC;
1182 goto bail_unlock;
1183 }
1184 }
1185
Jan Karaa90714c2008-10-09 19:38:40 +02001186 if ((attr->ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid) ||
1187 (attr->ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid)) {
Jan Kara65bac572009-06-02 14:24:01 +02001188 /*
1189 * Gather pointers to quota structures so that allocation /
1190 * freeing of quota structures happens here and not inside
Christoph Hellwigb43fa822010-03-03 09:05:03 -05001191 * dquot_transfer() where we have problems with lock ordering
Jan Kara65bac572009-06-02 14:24:01 +02001192 */
Jan Karaa90714c2008-10-09 19:38:40 +02001193 if (attr->ia_valid & ATTR_UID && attr->ia_uid != inode->i_uid
1194 && OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1195 OCFS2_FEATURE_RO_COMPAT_USRQUOTA)) {
Jan Kara65bac572009-06-02 14:24:01 +02001196 transfer_to[USRQUOTA] = dqget(sb, attr->ia_uid,
1197 USRQUOTA);
Jan Kara52a9ee22010-05-13 20:18:45 +02001198 if (!transfer_to[USRQUOTA]) {
Jan Kara65bac572009-06-02 14:24:01 +02001199 status = -ESRCH;
Jan Karaa90714c2008-10-09 19:38:40 +02001200 goto bail_unlock;
Jan Kara65bac572009-06-02 14:24:01 +02001201 }
Jan Karaa90714c2008-10-09 19:38:40 +02001202 }
1203 if (attr->ia_valid & ATTR_GID && attr->ia_gid != inode->i_gid
1204 && OCFS2_HAS_RO_COMPAT_FEATURE(sb,
1205 OCFS2_FEATURE_RO_COMPAT_GRPQUOTA)) {
Jan Kara65bac572009-06-02 14:24:01 +02001206 transfer_to[GRPQUOTA] = dqget(sb, attr->ia_gid,
1207 GRPQUOTA);
Jan Kara52a9ee22010-05-13 20:18:45 +02001208 if (!transfer_to[GRPQUOTA]) {
Jan Kara65bac572009-06-02 14:24:01 +02001209 status = -ESRCH;
Jan Karaa90714c2008-10-09 19:38:40 +02001210 goto bail_unlock;
Jan Kara65bac572009-06-02 14:24:01 +02001211 }
Jan Karaa90714c2008-10-09 19:38:40 +02001212 }
Jan Kara65bac572009-06-02 14:24:01 +02001213 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS +
1214 2 * ocfs2_quota_trans_credits(sb));
Jan Karaa90714c2008-10-09 19:38:40 +02001215 if (IS_ERR(handle)) {
1216 status = PTR_ERR(handle);
1217 mlog_errno(status);
1218 goto bail_unlock;
1219 }
Jan Kara52a9ee22010-05-13 20:18:45 +02001220 status = __dquot_transfer(inode, transfer_to);
Jan Karaa90714c2008-10-09 19:38:40 +02001221 if (status < 0)
1222 goto bail_commit;
1223 } else {
1224 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1225 if (IS_ERR(handle)) {
1226 status = PTR_ERR(handle);
1227 mlog_errno(status);
1228 goto bail_unlock;
1229 }
Mark Fashehccd979b2005-12-15 14:31:24 -08001230 }
1231
Mark Fasheh7307de82007-05-09 15:16:19 -07001232 /*
Christoph Hellwig2c27c652010-06-04 11:30:04 +02001233 * This will intentionally not wind up calling truncate_setsize(),
Mark Fasheh7307de82007-05-09 15:16:19 -07001234 * since all the work for a size change has been done above.
1235 * Otherwise, we could get into problems with truncate as
1236 * ip_alloc_sem is used there to protect against i_size
1237 * changes.
Christoph Hellwig10257742010-06-04 11:30:02 +02001238 *
1239 * XXX: this means the conditional below can probably be removed.
Mark Fasheh7307de82007-05-09 15:16:19 -07001240 */
Christoph Hellwig10257742010-06-04 11:30:02 +02001241 if ((attr->ia_valid & ATTR_SIZE) &&
1242 attr->ia_size != i_size_read(inode)) {
1243 status = vmtruncate(inode, attr->ia_size);
1244 if (status) {
1245 mlog_errno(status);
1246 goto bail_commit;
1247 }
Mark Fashehccd979b2005-12-15 14:31:24 -08001248 }
1249
Christoph Hellwig10257742010-06-04 11:30:02 +02001250 setattr_copy(inode, attr);
1251 mark_inode_dirty(inode);
1252
Mark Fashehccd979b2005-12-15 14:31:24 -08001253 status = ocfs2_mark_inode_dirty(handle, inode, bh);
1254 if (status < 0)
1255 mlog_errno(status);
1256
1257bail_commit:
Mark Fasheh02dc1af2006-10-09 16:48:10 -07001258 ocfs2_commit_trans(osb, handle);
Mark Fashehccd979b2005-12-15 14:31:24 -08001259bail_unlock:
Mark Fashehe63aecb62007-10-18 15:30:42 -07001260 ocfs2_inode_unlock(inode, 1);
Mark Fashehccd979b2005-12-15 14:31:24 -08001261bail_unlock_rw:
1262 if (size_change)
1263 ocfs2_rw_unlock(inode, 1);
1264bail:
Mark Fasheha81cb882008-10-07 14:25:16 -07001265 brelse(bh);
Mark Fashehccd979b2005-12-15 14:31:24 -08001266
Jan Kara65bac572009-06-02 14:24:01 +02001267 /* Release quota pointers in case we acquired them */
Jan Kara52a9ee22010-05-13 20:18:45 +02001268 for (qtype = 0; qtype < MAXQUOTAS; qtype++)
Jan Kara65bac572009-06-02 14:24:01 +02001269 dqput(transfer_to[qtype]);
Jan Kara65bac572009-06-02 14:24:01 +02001270
Tiger Yang060bc662008-11-14 11:17:29 +08001271 if (!status && attr->ia_valid & ATTR_MODE) {
1272 status = ocfs2_acl_chmod(inode);
1273 if (status < 0)
1274 mlog_errno(status);
1275 }
1276
Mark Fashehccd979b2005-12-15 14:31:24 -08001277 mlog_exit(status);
1278 return status;
1279}
1280
1281int ocfs2_getattr(struct vfsmount *mnt,
1282 struct dentry *dentry,
1283 struct kstat *stat)
1284{
1285 struct inode *inode = dentry->d_inode;
1286 struct super_block *sb = dentry->d_inode->i_sb;
1287 struct ocfs2_super *osb = sb->s_fs_info;
1288 int err;
1289
1290 mlog_entry_void();
1291
1292 err = ocfs2_inode_revalidate(dentry);
1293 if (err) {
1294 if (err != -ENOENT)
1295 mlog_errno(err);
1296 goto bail;
1297 }
1298
1299 generic_fillattr(inode, stat);
1300
1301 /* We set the blksize from the cluster size for performance */
1302 stat->blksize = osb->s_clustersize;
1303
1304bail:
1305 mlog_exit(err);
1306
1307 return err;
1308}
1309
Nick Pigginb74c79e2011-01-07 17:49:58 +11001310int ocfs2_permission(struct inode *inode, int mask, unsigned int flags)
Tiger Yangd38eb8d2006-11-27 09:59:21 +08001311{
1312 int ret;
1313
Nick Pigginb74c79e2011-01-07 17:49:58 +11001314 if (flags & IPERM_FLAG_RCU)
1315 return -ECHILD;
1316
Tiger Yangd38eb8d2006-11-27 09:59:21 +08001317 mlog_entry_void();
1318
Mark Fashehe63aecb62007-10-18 15:30:42 -07001319 ret = ocfs2_inode_lock(inode, NULL, 0);
Tiger Yangd38eb8d2006-11-27 09:59:21 +08001320 if (ret) {
Mark Fasheha9f5f702007-04-26 11:43:43 -07001321 if (ret != -ENOENT)
1322 mlog_errno(ret);
Tiger Yangd38eb8d2006-11-27 09:59:21 +08001323 goto out;
1324 }
1325
Nick Pigginb74c79e2011-01-07 17:49:58 +11001326 ret = generic_permission(inode, mask, flags, ocfs2_check_acl);
Tiger Yangd38eb8d2006-11-27 09:59:21 +08001327
Mark Fashehe63aecb62007-10-18 15:30:42 -07001328 ocfs2_inode_unlock(inode, 0);
Tiger Yangd38eb8d2006-11-27 09:59:21 +08001329out:
1330 mlog_exit(ret);
1331 return ret;
1332}
1333
Mark Fashehb2580102007-03-09 16:53:21 -08001334static int __ocfs2_write_remove_suid(struct inode *inode,
1335 struct buffer_head *bh)
Mark Fashehccd979b2005-12-15 14:31:24 -08001336{
1337 int ret;
Mark Fasheh1fabe142006-10-09 18:11:45 -07001338 handle_t *handle;
Mark Fashehccd979b2005-12-15 14:31:24 -08001339 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1340 struct ocfs2_dinode *di;
1341
Mark Fashehb06970532006-03-03 10:24:33 -08001342 mlog_entry("(Inode %llu, mode 0%o)\n",
Mark Fashehb2580102007-03-09 16:53:21 -08001343 (unsigned long long)OCFS2_I(inode)->ip_blkno, inode->i_mode);
Mark Fashehccd979b2005-12-15 14:31:24 -08001344
Mark Fasheh65eff9c2006-10-09 17:26:22 -07001345 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
Jan Karafa38e922008-10-20 19:23:51 +02001346 if (IS_ERR(handle)) {
1347 ret = PTR_ERR(handle);
Mark Fashehccd979b2005-12-15 14:31:24 -08001348 mlog_errno(ret);
1349 goto out;
1350 }
1351
Joel Becker0cf2f762009-02-12 16:41:25 -08001352 ret = ocfs2_journal_access_di(handle, INODE_CACHE(inode), bh,
Joel Becker13723d02008-10-17 19:25:01 -07001353 OCFS2_JOURNAL_ACCESS_WRITE);
Mark Fashehccd979b2005-12-15 14:31:24 -08001354 if (ret < 0) {
1355 mlog_errno(ret);
Mark Fashehb2580102007-03-09 16:53:21 -08001356 goto out_trans;
Mark Fashehccd979b2005-12-15 14:31:24 -08001357 }
1358
1359 inode->i_mode &= ~S_ISUID;
1360 if ((inode->i_mode & S_ISGID) && (inode->i_mode & S_IXGRP))
1361 inode->i_mode &= ~S_ISGID;
1362
1363 di = (struct ocfs2_dinode *) bh->b_data;
1364 di->i_mode = cpu_to_le16(inode->i_mode);
1365
Joel Beckerec20cec2010-03-19 14:13:52 -07001366 ocfs2_journal_dirty(handle, bh);
Mark Fashehb2580102007-03-09 16:53:21 -08001367
Mark Fashehccd979b2005-12-15 14:31:24 -08001368out_trans:
Mark Fasheh02dc1af2006-10-09 16:48:10 -07001369 ocfs2_commit_trans(osb, handle);
Mark Fashehccd979b2005-12-15 14:31:24 -08001370out:
1371 mlog_exit(ret);
1372 return ret;
1373}
1374
Mark Fasheh9517bac2007-02-09 20:24:12 -08001375/*
1376 * Will look for holes and unwritten extents in the range starting at
1377 * pos for count bytes (inclusive).
1378 */
1379static int ocfs2_check_range_for_holes(struct inode *inode, loff_t pos,
1380 size_t count)
1381{
1382 int ret = 0;
Mark Fasheh49cb8d22007-03-09 16:21:46 -08001383 unsigned int extent_flags;
Mark Fasheh9517bac2007-02-09 20:24:12 -08001384 u32 cpos, clusters, extent_len, phys_cpos;
1385 struct super_block *sb = inode->i_sb;
1386
1387 cpos = pos >> OCFS2_SB(sb)->s_clustersize_bits;
1388 clusters = ocfs2_clusters_for_bytes(sb, pos + count) - cpos;
1389
1390 while (clusters) {
Mark Fasheh49cb8d22007-03-09 16:21:46 -08001391 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len,
1392 &extent_flags);
Mark Fasheh9517bac2007-02-09 20:24:12 -08001393 if (ret < 0) {
1394 mlog_errno(ret);
1395 goto out;
1396 }
1397
Mark Fasheh49cb8d22007-03-09 16:21:46 -08001398 if (phys_cpos == 0 || (extent_flags & OCFS2_EXT_UNWRITTEN)) {
Mark Fasheh9517bac2007-02-09 20:24:12 -08001399 ret = 1;
1400 break;
1401 }
1402
1403 if (extent_len > clusters)
1404 extent_len = clusters;
1405
1406 clusters -= extent_len;
1407 cpos += extent_len;
1408 }
1409out:
1410 return ret;
1411}
1412
Mark Fashehb2580102007-03-09 16:53:21 -08001413static int ocfs2_write_remove_suid(struct inode *inode)
1414{
1415 int ret;
1416 struct buffer_head *bh = NULL;
Mark Fashehb2580102007-03-09 16:53:21 -08001417
Joel Beckerb657c952008-11-13 14:49:11 -08001418 ret = ocfs2_read_inode_block(inode, &bh);
Mark Fashehb2580102007-03-09 16:53:21 -08001419 if (ret < 0) {
1420 mlog_errno(ret);
1421 goto out;
1422 }
1423
1424 ret = __ocfs2_write_remove_suid(inode, bh);
1425out:
1426 brelse(bh);
1427 return ret;
1428}
1429
Mark Fasheh2ae99a62007-03-09 16:43:28 -08001430/*
1431 * Allocate enough extents to cover the region starting at byte offset
1432 * start for len bytes. Existing extents are skipped, any extents
1433 * added are marked as "unwritten".
1434 */
1435static int ocfs2_allocate_unwritten_extents(struct inode *inode,
1436 u64 start, u64 len)
1437{
1438 int ret;
1439 u32 cpos, phys_cpos, clusters, alloc_size;
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001440 u64 end = start + len;
1441 struct buffer_head *di_bh = NULL;
1442
1443 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
Joel Beckerb657c952008-11-13 14:49:11 -08001444 ret = ocfs2_read_inode_block(inode, &di_bh);
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001445 if (ret) {
1446 mlog_errno(ret);
1447 goto out;
1448 }
1449
1450 /*
1451 * Nothing to do if the requested reservation range
1452 * fits within the inode.
1453 */
1454 if (ocfs2_size_fits_inline_data(di_bh, end))
1455 goto out;
1456
1457 ret = ocfs2_convert_inline_data_to_extents(inode, di_bh);
1458 if (ret) {
1459 mlog_errno(ret);
1460 goto out;
1461 }
1462 }
Mark Fasheh2ae99a62007-03-09 16:43:28 -08001463
1464 /*
1465 * We consider both start and len to be inclusive.
1466 */
1467 cpos = start >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
1468 clusters = ocfs2_clusters_for_bytes(inode->i_sb, start + len);
1469 clusters -= cpos;
1470
1471 while (clusters) {
1472 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos,
1473 &alloc_size, NULL);
1474 if (ret) {
1475 mlog_errno(ret);
1476 goto out;
1477 }
1478
1479 /*
1480 * Hole or existing extent len can be arbitrary, so
1481 * cap it to our own allocation request.
1482 */
1483 if (alloc_size > clusters)
1484 alloc_size = clusters;
1485
1486 if (phys_cpos) {
1487 /*
1488 * We already have an allocation at this
1489 * region so we can safely skip it.
1490 */
1491 goto next;
1492 }
1493
1494 ret = __ocfs2_extend_allocation(inode, cpos, alloc_size, 1);
1495 if (ret) {
1496 if (ret != -ENOSPC)
1497 mlog_errno(ret);
1498 goto out;
1499 }
1500
1501next:
1502 cpos += alloc_size;
1503 clusters -= alloc_size;
1504 }
1505
1506 ret = 0;
1507out:
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001508
1509 brelse(di_bh);
Mark Fasheh2ae99a62007-03-09 16:43:28 -08001510 return ret;
1511}
1512
Mark Fasheh063c4562007-07-03 13:34:11 -07001513/*
1514 * Truncate a byte range, avoiding pages within partial clusters. This
1515 * preserves those pages for the zeroing code to write to.
1516 */
1517static void ocfs2_truncate_cluster_pages(struct inode *inode, u64 byte_start,
1518 u64 byte_len)
1519{
1520 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1521 loff_t start, end;
1522 struct address_space *mapping = inode->i_mapping;
1523
1524 start = (loff_t)ocfs2_align_bytes_to_clusters(inode->i_sb, byte_start);
1525 end = byte_start + byte_len;
1526 end = end & ~(osb->s_clustersize - 1);
1527
1528 if (start < end) {
1529 unmap_mapping_range(mapping, start, end - start, 0);
1530 truncate_inode_pages_range(mapping, start, end - 1);
1531 }
1532}
1533
1534static int ocfs2_zero_partial_clusters(struct inode *inode,
1535 u64 start, u64 len)
1536{
1537 int ret = 0;
1538 u64 tmpend, end = start + len;
1539 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1540 unsigned int csize = osb->s_clustersize;
1541 handle_t *handle;
1542
1543 /*
1544 * The "start" and "end" values are NOT necessarily part of
1545 * the range whose allocation is being deleted. Rather, this
1546 * is what the user passed in with the request. We must zero
1547 * partial clusters here. There's no need to worry about
1548 * physical allocation - the zeroing code knows to skip holes.
1549 */
1550 mlog(0, "byte start: %llu, end: %llu\n",
1551 (unsigned long long)start, (unsigned long long)end);
1552
1553 /*
1554 * If both edges are on a cluster boundary then there's no
1555 * zeroing required as the region is part of the allocation to
1556 * be truncated.
1557 */
1558 if ((start & (csize - 1)) == 0 && (end & (csize - 1)) == 0)
1559 goto out;
1560
1561 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
Jan Karafa38e922008-10-20 19:23:51 +02001562 if (IS_ERR(handle)) {
1563 ret = PTR_ERR(handle);
Mark Fasheh063c4562007-07-03 13:34:11 -07001564 mlog_errno(ret);
1565 goto out;
1566 }
1567
1568 /*
1569 * We want to get the byte offset of the end of the 1st cluster.
1570 */
1571 tmpend = (u64)osb->s_clustersize + (start & ~(osb->s_clustersize - 1));
1572 if (tmpend > end)
1573 tmpend = end;
1574
1575 mlog(0, "1st range: start: %llu, tmpend: %llu\n",
1576 (unsigned long long)start, (unsigned long long)tmpend);
1577
1578 ret = ocfs2_zero_range_for_truncate(inode, handle, start, tmpend);
1579 if (ret)
1580 mlog_errno(ret);
1581
1582 if (tmpend < end) {
1583 /*
1584 * This may make start and end equal, but the zeroing
1585 * code will skip any work in that case so there's no
1586 * need to catch it up here.
1587 */
1588 start = end & ~(osb->s_clustersize - 1);
1589
1590 mlog(0, "2nd range: start: %llu, end: %llu\n",
1591 (unsigned long long)start, (unsigned long long)end);
1592
1593 ret = ocfs2_zero_range_for_truncate(inode, handle, start, end);
1594 if (ret)
1595 mlog_errno(ret);
1596 }
1597
1598 ocfs2_commit_trans(osb, handle);
1599out:
1600 return ret;
1601}
1602
Tristan Yec1631d42010-05-11 17:54:45 +08001603static int ocfs2_find_rec(struct ocfs2_extent_list *el, u32 pos)
1604{
1605 int i;
1606 struct ocfs2_extent_rec *rec = NULL;
1607
1608 for (i = le16_to_cpu(el->l_next_free_rec) - 1; i >= 0; i--) {
1609
1610 rec = &el->l_recs[i];
1611
1612 if (le32_to_cpu(rec->e_cpos) < pos)
1613 break;
1614 }
1615
1616 return i;
1617}
1618
1619/*
1620 * Helper to calculate the punching pos and length in one run, we handle the
1621 * following three cases in order:
1622 *
1623 * - remove the entire record
1624 * - remove a partial record
1625 * - no record needs to be removed (hole-punching completed)
1626*/
1627static void ocfs2_calc_trunc_pos(struct inode *inode,
1628 struct ocfs2_extent_list *el,
1629 struct ocfs2_extent_rec *rec,
1630 u32 trunc_start, u32 *trunc_cpos,
1631 u32 *trunc_len, u32 *trunc_end,
1632 u64 *blkno, int *done)
1633{
1634 int ret = 0;
1635 u32 coff, range;
1636
1637 range = le32_to_cpu(rec->e_cpos) + ocfs2_rec_clusters(el, rec);
1638
1639 if (le32_to_cpu(rec->e_cpos) >= trunc_start) {
1640 *trunc_cpos = le32_to_cpu(rec->e_cpos);
1641 /*
1642 * Skip holes if any.
1643 */
1644 if (range < *trunc_end)
1645 *trunc_end = range;
1646 *trunc_len = *trunc_end - le32_to_cpu(rec->e_cpos);
1647 *blkno = le64_to_cpu(rec->e_blkno);
1648 *trunc_end = le32_to_cpu(rec->e_cpos);
1649 } else if (range > trunc_start) {
1650 *trunc_cpos = trunc_start;
1651 *trunc_len = *trunc_end - trunc_start;
1652 coff = trunc_start - le32_to_cpu(rec->e_cpos);
1653 *blkno = le64_to_cpu(rec->e_blkno) +
1654 ocfs2_clusters_to_blocks(inode->i_sb, coff);
1655 *trunc_end = trunc_start;
1656 } else {
1657 /*
1658 * It may have two following possibilities:
1659 *
1660 * - last record has been removed
1661 * - trunc_start was within a hole
1662 *
1663 * both two cases mean the completion of hole punching.
1664 */
1665 ret = 1;
1666 }
1667
1668 *done = ret;
1669}
1670
Mark Fasheh063c4562007-07-03 13:34:11 -07001671static int ocfs2_remove_inode_range(struct inode *inode,
1672 struct buffer_head *di_bh, u64 byte_start,
1673 u64 byte_len)
1674{
Tristan Yec1631d42010-05-11 17:54:45 +08001675 int ret = 0, flags = 0, done = 0, i;
1676 u32 trunc_start, trunc_len, trunc_end, trunc_cpos, phys_cpos;
1677 u32 cluster_in_el;
Mark Fasheh063c4562007-07-03 13:34:11 -07001678 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1679 struct ocfs2_cached_dealloc_ctxt dealloc;
Mark Fashehb1967d02007-11-20 11:56:39 -08001680 struct address_space *mapping = inode->i_mapping;
Mark Fashehfecc0112008-11-12 15:16:38 -08001681 struct ocfs2_extent_tree et;
Tristan Yec1631d42010-05-11 17:54:45 +08001682 struct ocfs2_path *path = NULL;
1683 struct ocfs2_extent_list *el = NULL;
1684 struct ocfs2_extent_rec *rec = NULL;
Tristan Yee8aec062010-05-11 17:54:43 +08001685 struct ocfs2_dinode *di = (struct ocfs2_dinode *)di_bh->b_data;
Tristan Yec1631d42010-05-11 17:54:45 +08001686 u64 blkno, refcount_loc = le64_to_cpu(di->i_refcount_loc);
Mark Fasheh063c4562007-07-03 13:34:11 -07001687
Joel Becker5e404e92009-02-13 03:54:22 -08001688 ocfs2_init_dinode_extent_tree(&et, INODE_CACHE(inode), di_bh);
Mark Fasheh063c4562007-07-03 13:34:11 -07001689 ocfs2_init_dealloc_ctxt(&dealloc);
1690
1691 if (byte_len == 0)
1692 return 0;
1693
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001694 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
1695 ret = ocfs2_truncate_inline(inode, di_bh, byte_start,
Mark Fashehb1967d02007-11-20 11:56:39 -08001696 byte_start + byte_len, 0);
1697 if (ret) {
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001698 mlog_errno(ret);
Mark Fashehb1967d02007-11-20 11:56:39 -08001699 goto out;
1700 }
1701 /*
1702 * There's no need to get fancy with the page cache
1703 * truncate of an inline-data inode. We're talking
1704 * about less than a page here, which will be cached
1705 * in the dinode buffer anyway.
1706 */
1707 unmap_mapping_range(mapping, 0, 0, 0);
1708 truncate_inode_pages(mapping, 0);
1709 goto out;
Mark Fasheh1afc32b2007-09-07 14:46:51 -07001710 }
1711
Tristan Yee8aec062010-05-11 17:54:43 +08001712 /*
1713 * For reflinks, we may need to CoW 2 clusters which might be
1714 * partially zero'd later, if hole's start and end offset were
1715 * within one cluster(means is not exactly aligned to clustersize).
1716 */
Mark Fasheh063c4562007-07-03 13:34:11 -07001717
Tristan Yee8aec062010-05-11 17:54:43 +08001718 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL) {
1719
1720 ret = ocfs2_cow_file_pos(inode, di_bh, byte_start);
1721 if (ret) {
1722 mlog_errno(ret);
1723 goto out;
1724 }
1725
1726 ret = ocfs2_cow_file_pos(inode, di_bh, byte_start + byte_len);
1727 if (ret) {
1728 mlog_errno(ret);
1729 goto out;
1730 }
1731 }
1732
Mark Fasheh063c4562007-07-03 13:34:11 -07001733 trunc_start = ocfs2_clusters_for_bytes(osb->sb, byte_start);
Tristan Yec1631d42010-05-11 17:54:45 +08001734 trunc_end = (byte_start + byte_len) >> osb->s_clustersize_bits;
1735 cluster_in_el = trunc_end;
Mark Fasheh063c4562007-07-03 13:34:11 -07001736
Tristan Yec1631d42010-05-11 17:54:45 +08001737 mlog(0, "Inode: %llu, start: %llu, len: %llu, cstart: %u, cend: %u\n",
Mark Fasheh063c4562007-07-03 13:34:11 -07001738 (unsigned long long)OCFS2_I(inode)->ip_blkno,
1739 (unsigned long long)byte_start,
Tristan Yec1631d42010-05-11 17:54:45 +08001740 (unsigned long long)byte_len, trunc_start, trunc_end);
Mark Fasheh063c4562007-07-03 13:34:11 -07001741
1742 ret = ocfs2_zero_partial_clusters(inode, byte_start, byte_len);
1743 if (ret) {
1744 mlog_errno(ret);
1745 goto out;
1746 }
1747
Tristan Yec1631d42010-05-11 17:54:45 +08001748 path = ocfs2_new_path_from_et(&et);
1749 if (!path) {
1750 ret = -ENOMEM;
1751 mlog_errno(ret);
1752 goto out;
1753 }
1754
1755 while (trunc_end > trunc_start) {
1756
1757 ret = ocfs2_find_path(INODE_CACHE(inode), path,
1758 cluster_in_el);
Mark Fasheh063c4562007-07-03 13:34:11 -07001759 if (ret) {
1760 mlog_errno(ret);
1761 goto out;
1762 }
1763
Tristan Yec1631d42010-05-11 17:54:45 +08001764 el = path_leaf_el(path);
Mark Fasheh063c4562007-07-03 13:34:11 -07001765
Tristan Yec1631d42010-05-11 17:54:45 +08001766 i = ocfs2_find_rec(el, trunc_end);
1767 /*
1768 * Need to go to previous extent block.
1769 */
1770 if (i < 0) {
1771 if (path->p_tree_depth == 0)
1772 break;
1773
1774 ret = ocfs2_find_cpos_for_left_leaf(inode->i_sb,
1775 path,
1776 &cluster_in_el);
Mark Fasheh063c4562007-07-03 13:34:11 -07001777 if (ret) {
1778 mlog_errno(ret);
1779 goto out;
1780 }
Tristan Yec1631d42010-05-11 17:54:45 +08001781
1782 /*
1783 * We've reached the leftmost extent block,
1784 * it's safe to leave.
1785 */
1786 if (cluster_in_el == 0)
1787 break;
1788
1789 /*
1790 * The 'pos' searched for previous extent block is
1791 * always one cluster less than actual trunc_end.
1792 */
1793 trunc_end = cluster_in_el + 1;
1794
1795 ocfs2_reinit_path(path, 1);
1796
1797 continue;
1798
1799 } else
1800 rec = &el->l_recs[i];
1801
1802 ocfs2_calc_trunc_pos(inode, el, rec, trunc_start, &trunc_cpos,
1803 &trunc_len, &trunc_end, &blkno, &done);
1804 if (done)
1805 break;
1806
1807 flags = rec->e_flags;
1808 phys_cpos = ocfs2_blocks_to_clusters(inode->i_sb, blkno);
1809
1810 ret = ocfs2_remove_btree_range(inode, &et, trunc_cpos,
1811 phys_cpos, trunc_len, flags,
1812 &dealloc, refcount_loc);
1813 if (ret < 0) {
1814 mlog_errno(ret);
1815 goto out;
Mark Fasheh063c4562007-07-03 13:34:11 -07001816 }
1817
Tristan Yec1631d42010-05-11 17:54:45 +08001818 cluster_in_el = trunc_end;
1819
1820 ocfs2_reinit_path(path, 1);
Mark Fasheh063c4562007-07-03 13:34:11 -07001821 }
1822
1823 ocfs2_truncate_cluster_pages(inode, byte_start, byte_len);
1824
1825out:
1826 ocfs2_schedule_truncate_log_flush(osb, 1);
1827 ocfs2_run_deallocs(osb, &dealloc);
1828
1829 return ret;
1830}
1831
Mark Fashehb2580102007-03-09 16:53:21 -08001832/*
1833 * Parts of this function taken from xfs_change_file_space()
1834 */
Mark Fasheh385820a2007-07-19 00:14:38 -07001835static int __ocfs2_change_file_space(struct file *file, struct inode *inode,
1836 loff_t f_pos, unsigned int cmd,
1837 struct ocfs2_space_resv *sr,
1838 int change_size)
Mark Fashehb2580102007-03-09 16:53:21 -08001839{
1840 int ret;
1841 s64 llen;
Mark Fasheh385820a2007-07-19 00:14:38 -07001842 loff_t size;
Mark Fashehb2580102007-03-09 16:53:21 -08001843 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1844 struct buffer_head *di_bh = NULL;
1845 handle_t *handle;
Mark Fasheha00cce32007-07-20 11:28:30 -07001846 unsigned long long max_off = inode->i_sb->s_maxbytes;
Mark Fashehb2580102007-03-09 16:53:21 -08001847
Mark Fashehb2580102007-03-09 16:53:21 -08001848 if (ocfs2_is_hard_readonly(osb) || ocfs2_is_soft_readonly(osb))
1849 return -EROFS;
1850
1851 mutex_lock(&inode->i_mutex);
1852
1853 /*
1854 * This prevents concurrent writes on other nodes
1855 */
1856 ret = ocfs2_rw_lock(inode, 1);
1857 if (ret) {
1858 mlog_errno(ret);
1859 goto out;
1860 }
1861
Mark Fashehe63aecb62007-10-18 15:30:42 -07001862 ret = ocfs2_inode_lock(inode, &di_bh, 1);
Mark Fashehb2580102007-03-09 16:53:21 -08001863 if (ret) {
1864 mlog_errno(ret);
1865 goto out_rw_unlock;
1866 }
1867
1868 if (inode->i_flags & (S_IMMUTABLE|S_APPEND)) {
1869 ret = -EPERM;
Mark Fashehe63aecb62007-10-18 15:30:42 -07001870 goto out_inode_unlock;
Mark Fashehb2580102007-03-09 16:53:21 -08001871 }
1872
1873 switch (sr->l_whence) {
1874 case 0: /*SEEK_SET*/
1875 break;
1876 case 1: /*SEEK_CUR*/
Mark Fasheh385820a2007-07-19 00:14:38 -07001877 sr->l_start += f_pos;
Mark Fashehb2580102007-03-09 16:53:21 -08001878 break;
1879 case 2: /*SEEK_END*/
1880 sr->l_start += i_size_read(inode);
1881 break;
1882 default:
1883 ret = -EINVAL;
Mark Fashehe63aecb62007-10-18 15:30:42 -07001884 goto out_inode_unlock;
Mark Fashehb2580102007-03-09 16:53:21 -08001885 }
1886 sr->l_whence = 0;
1887
1888 llen = sr->l_len > 0 ? sr->l_len - 1 : sr->l_len;
1889
1890 if (sr->l_start < 0
1891 || sr->l_start > max_off
1892 || (sr->l_start + llen) < 0
1893 || (sr->l_start + llen) > max_off) {
1894 ret = -EINVAL;
Mark Fashehe63aecb62007-10-18 15:30:42 -07001895 goto out_inode_unlock;
Mark Fashehb2580102007-03-09 16:53:21 -08001896 }
Mark Fasheh385820a2007-07-19 00:14:38 -07001897 size = sr->l_start + sr->l_len;
Mark Fashehb2580102007-03-09 16:53:21 -08001898
1899 if (cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64) {
1900 if (sr->l_len <= 0) {
1901 ret = -EINVAL;
Mark Fashehe63aecb62007-10-18 15:30:42 -07001902 goto out_inode_unlock;
Mark Fashehb2580102007-03-09 16:53:21 -08001903 }
1904 }
1905
Mark Fasheh385820a2007-07-19 00:14:38 -07001906 if (file && should_remove_suid(file->f_path.dentry)) {
Mark Fashehb2580102007-03-09 16:53:21 -08001907 ret = __ocfs2_write_remove_suid(inode, di_bh);
1908 if (ret) {
1909 mlog_errno(ret);
Mark Fashehe63aecb62007-10-18 15:30:42 -07001910 goto out_inode_unlock;
Mark Fashehb2580102007-03-09 16:53:21 -08001911 }
1912 }
1913
1914 down_write(&OCFS2_I(inode)->ip_alloc_sem);
1915 switch (cmd) {
1916 case OCFS2_IOC_RESVSP:
1917 case OCFS2_IOC_RESVSP64:
1918 /*
1919 * This takes unsigned offsets, but the signed ones we
1920 * pass have been checked against overflow above.
1921 */
1922 ret = ocfs2_allocate_unwritten_extents(inode, sr->l_start,
1923 sr->l_len);
1924 break;
1925 case OCFS2_IOC_UNRESVSP:
1926 case OCFS2_IOC_UNRESVSP64:
1927 ret = ocfs2_remove_inode_range(inode, di_bh, sr->l_start,
1928 sr->l_len);
1929 break;
1930 default:
1931 ret = -EINVAL;
1932 }
1933 up_write(&OCFS2_I(inode)->ip_alloc_sem);
1934 if (ret) {
1935 mlog_errno(ret);
Mark Fashehe63aecb62007-10-18 15:30:42 -07001936 goto out_inode_unlock;
Mark Fashehb2580102007-03-09 16:53:21 -08001937 }
1938
1939 /*
1940 * We update c/mtime for these changes
1941 */
1942 handle = ocfs2_start_trans(osb, OCFS2_INODE_UPDATE_CREDITS);
1943 if (IS_ERR(handle)) {
1944 ret = PTR_ERR(handle);
1945 mlog_errno(ret);
Mark Fashehe63aecb62007-10-18 15:30:42 -07001946 goto out_inode_unlock;
Mark Fashehb2580102007-03-09 16:53:21 -08001947 }
1948
Mark Fasheh385820a2007-07-19 00:14:38 -07001949 if (change_size && i_size_read(inode) < size)
1950 i_size_write(inode, size);
1951
Mark Fashehb2580102007-03-09 16:53:21 -08001952 inode->i_ctime = inode->i_mtime = CURRENT_TIME;
1953 ret = ocfs2_mark_inode_dirty(handle, inode, di_bh);
1954 if (ret < 0)
1955 mlog_errno(ret);
1956
1957 ocfs2_commit_trans(osb, handle);
1958
Mark Fashehe63aecb62007-10-18 15:30:42 -07001959out_inode_unlock:
Mark Fashehb2580102007-03-09 16:53:21 -08001960 brelse(di_bh);
Mark Fashehe63aecb62007-10-18 15:30:42 -07001961 ocfs2_inode_unlock(inode, 1);
Mark Fashehb2580102007-03-09 16:53:21 -08001962out_rw_unlock:
1963 ocfs2_rw_unlock(inode, 1);
1964
Mark Fashehb2580102007-03-09 16:53:21 -08001965out:
Julia Lawallc259ae52008-07-21 09:59:15 +02001966 mutex_unlock(&inode->i_mutex);
Mark Fashehb2580102007-03-09 16:53:21 -08001967 return ret;
1968}
1969
Mark Fasheh385820a2007-07-19 00:14:38 -07001970int ocfs2_change_file_space(struct file *file, unsigned int cmd,
1971 struct ocfs2_space_resv *sr)
1972{
1973 struct inode *inode = file->f_path.dentry->d_inode;
Fernando Carrijoc19a28e2009-01-07 18:09:08 -08001974 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
Mark Fasheh385820a2007-07-19 00:14:38 -07001975
1976 if ((cmd == OCFS2_IOC_RESVSP || cmd == OCFS2_IOC_RESVSP64) &&
1977 !ocfs2_writes_unwritten_extents(osb))
1978 return -ENOTTY;
1979 else if ((cmd == OCFS2_IOC_UNRESVSP || cmd == OCFS2_IOC_UNRESVSP64) &&
1980 !ocfs2_sparse_alloc(osb))
1981 return -ENOTTY;
1982
1983 if (!S_ISREG(inode->i_mode))
1984 return -EINVAL;
1985
1986 if (!(file->f_mode & FMODE_WRITE))
1987 return -EBADF;
1988
1989 return __ocfs2_change_file_space(file, inode, file->f_pos, cmd, sr, 0);
1990}
1991
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01001992static long ocfs2_fallocate(struct file *file, int mode, loff_t offset,
Mark Fasheh385820a2007-07-19 00:14:38 -07001993 loff_t len)
1994{
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01001995 struct inode *inode = file->f_path.dentry->d_inode;
Mark Fasheh385820a2007-07-19 00:14:38 -07001996 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
1997 struct ocfs2_space_resv sr;
1998 int change_size = 1;
Josef Bacikdb47fef2010-11-17 20:46:17 -05001999 int cmd = OCFS2_IOC_RESVSP64;
Mark Fasheh385820a2007-07-19 00:14:38 -07002000
Christoph Hellwig64c23e82011-01-14 13:07:30 +01002001 if (mode & ~(FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE))
2002 return -EOPNOTSUPP;
Mark Fasheh385820a2007-07-19 00:14:38 -07002003 if (!ocfs2_writes_unwritten_extents(osb))
2004 return -EOPNOTSUPP;
2005
Mark Fasheh385820a2007-07-19 00:14:38 -07002006 if (mode & FALLOC_FL_KEEP_SIZE)
2007 change_size = 0;
2008
Josef Bacikdb47fef2010-11-17 20:46:17 -05002009 if (mode & FALLOC_FL_PUNCH_HOLE)
2010 cmd = OCFS2_IOC_UNRESVSP64;
2011
Mark Fasheh385820a2007-07-19 00:14:38 -07002012 sr.l_whence = 0;
2013 sr.l_start = (s64)offset;
2014 sr.l_len = (s64)len;
2015
Josef Bacikdb47fef2010-11-17 20:46:17 -05002016 return __ocfs2_change_file_space(NULL, inode, offset, cmd, &sr,
2017 change_size);
Mark Fasheh385820a2007-07-19 00:14:38 -07002018}
2019
Tao Ma293b2f72009-08-25 08:02:48 +08002020int ocfs2_check_range_for_refcount(struct inode *inode, loff_t pos,
2021 size_t count)
2022{
2023 int ret = 0;
2024 unsigned int extent_flags;
2025 u32 cpos, clusters, extent_len, phys_cpos;
2026 struct super_block *sb = inode->i_sb;
2027
2028 if (!ocfs2_refcount_tree(OCFS2_SB(inode->i_sb)) ||
Tao Ma2f48d592009-10-15 11:10:49 +08002029 !(OCFS2_I(inode)->ip_dyn_features & OCFS2_HAS_REFCOUNT_FL) ||
2030 OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL)
Tao Ma293b2f72009-08-25 08:02:48 +08002031 return 0;
2032
2033 cpos = pos >> OCFS2_SB(sb)->s_clustersize_bits;
2034 clusters = ocfs2_clusters_for_bytes(sb, pos + count) - cpos;
2035
2036 while (clusters) {
2037 ret = ocfs2_get_clusters(inode, cpos, &phys_cpos, &extent_len,
2038 &extent_flags);
2039 if (ret < 0) {
2040 mlog_errno(ret);
2041 goto out;
2042 }
2043
2044 if (phys_cpos && (extent_flags & OCFS2_EXT_REFCOUNTED)) {
2045 ret = 1;
2046 break;
2047 }
2048
2049 if (extent_len > clusters)
2050 extent_len = clusters;
2051
2052 clusters -= extent_len;
2053 cpos += extent_len;
2054 }
2055out:
2056 return ret;
2057}
2058
2059static int ocfs2_prepare_inode_for_refcount(struct inode *inode,
Tao Mab8908232010-08-12 10:27:14 +08002060 struct file *file,
Tao Ma293b2f72009-08-25 08:02:48 +08002061 loff_t pos, size_t count,
2062 int *meta_level)
2063{
2064 int ret;
2065 struct buffer_head *di_bh = NULL;
2066 u32 cpos = pos >> OCFS2_SB(inode->i_sb)->s_clustersize_bits;
2067 u32 clusters =
2068 ocfs2_clusters_for_bytes(inode->i_sb, pos + count) - cpos;
2069
2070 ret = ocfs2_inode_lock(inode, &di_bh, 1);
2071 if (ret) {
2072 mlog_errno(ret);
2073 goto out;
2074 }
2075
2076 *meta_level = 1;
2077
Tao Ma15502712010-08-12 10:36:38 +08002078 ret = ocfs2_refcount_cow(inode, file, di_bh, cpos, clusters, UINT_MAX);
Tao Ma293b2f72009-08-25 08:02:48 +08002079 if (ret)
2080 mlog_errno(ret);
2081out:
2082 brelse(di_bh);
2083 return ret;
2084}
2085
Tao Mab8908232010-08-12 10:27:14 +08002086static int ocfs2_prepare_inode_for_write(struct file *file,
Tiger Yang8659ac22006-10-17 18:29:52 -07002087 loff_t *ppos,
2088 size_t count,
Mark Fasheh9517bac2007-02-09 20:24:12 -08002089 int appending,
Tao Ma86470e92009-12-03 21:55:05 +08002090 int *direct_io,
2091 int *has_refcount)
Mark Fashehccd979b2005-12-15 14:31:24 -08002092{
Mark Fasheh65ed39d2007-08-28 17:13:23 -07002093 int ret = 0, meta_level = 0;
Tao Mab8908232010-08-12 10:27:14 +08002094 struct dentry *dentry = file->f_path.dentry;
Tiger Yang8659ac22006-10-17 18:29:52 -07002095 struct inode *inode = dentry->d_inode;
Mark Fasheh65ed39d2007-08-28 17:13:23 -07002096 loff_t saved_pos, end;
Mark Fashehccd979b2005-12-15 14:31:24 -08002097
Sunil Mushran2bd63212010-01-25 16:57:38 -08002098 /*
Mark Fasheh65ed39d2007-08-28 17:13:23 -07002099 * We start with a read level meta lock and only jump to an ex
2100 * if we need to make modifications here.
Mark Fashehccd979b2005-12-15 14:31:24 -08002101 */
Mark Fashehccd979b2005-12-15 14:31:24 -08002102 for(;;) {
Mark Fashehe63aecb62007-10-18 15:30:42 -07002103 ret = ocfs2_inode_lock(inode, NULL, meta_level);
Mark Fashehccd979b2005-12-15 14:31:24 -08002104 if (ret < 0) {
2105 meta_level = -1;
2106 mlog_errno(ret);
2107 goto out;
2108 }
2109
2110 /* Clear suid / sgid if necessary. We do this here
2111 * instead of later in the write path because
2112 * remove_suid() calls ->setattr without any hint that
2113 * we may have already done our cluster locking. Since
2114 * ocfs2_setattr() *must* take cluster locks to
2115 * proceeed, this will lead us to recursively lock the
2116 * inode. There's also the dinode i_size state which
2117 * can be lost via setattr during extending writes (we
2118 * set inode->i_size at the end of a write. */
Tiger Yang8659ac22006-10-17 18:29:52 -07002119 if (should_remove_suid(dentry)) {
Mark Fashehccd979b2005-12-15 14:31:24 -08002120 if (meta_level == 0) {
Mark Fashehe63aecb62007-10-18 15:30:42 -07002121 ocfs2_inode_unlock(inode, meta_level);
Mark Fashehccd979b2005-12-15 14:31:24 -08002122 meta_level = 1;
2123 continue;
2124 }
2125
2126 ret = ocfs2_write_remove_suid(inode);
2127 if (ret < 0) {
2128 mlog_errno(ret);
Tiger Yang8659ac22006-10-17 18:29:52 -07002129 goto out_unlock;
Mark Fashehccd979b2005-12-15 14:31:24 -08002130 }
2131 }
2132
2133 /* work on a copy of ppos until we're sure that we won't have
2134 * to recalculate it due to relocking. */
Tiger Yang8659ac22006-10-17 18:29:52 -07002135 if (appending) {
Mark Fashehccd979b2005-12-15 14:31:24 -08002136 saved_pos = i_size_read(inode);
2137 mlog(0, "O_APPEND: inode->i_size=%llu\n", saved_pos);
2138 } else {
Tiger Yang8659ac22006-10-17 18:29:52 -07002139 saved_pos = *ppos;
Mark Fashehccd979b2005-12-15 14:31:24 -08002140 }
Mark Fasheh3a0782d2007-01-17 12:53:31 -08002141
Mark Fasheh65ed39d2007-08-28 17:13:23 -07002142 end = saved_pos + count;
Mark Fasheh9517bac2007-02-09 20:24:12 -08002143
Tao Ma293b2f72009-08-25 08:02:48 +08002144 ret = ocfs2_check_range_for_refcount(inode, saved_pos, count);
2145 if (ret == 1) {
2146 ocfs2_inode_unlock(inode, meta_level);
2147 meta_level = -1;
2148
2149 ret = ocfs2_prepare_inode_for_refcount(inode,
Tao Mab8908232010-08-12 10:27:14 +08002150 file,
Tao Ma293b2f72009-08-25 08:02:48 +08002151 saved_pos,
2152 count,
2153 &meta_level);
Tao Ma86470e92009-12-03 21:55:05 +08002154 if (has_refcount)
2155 *has_refcount = 1;
Wengang Wang96a1cc72010-02-09 14:57:45 +08002156 if (direct_io)
2157 *direct_io = 0;
Tao Ma293b2f72009-08-25 08:02:48 +08002158 }
2159
2160 if (ret < 0) {
2161 mlog_errno(ret);
2162 goto out_unlock;
2163 }
2164
Mark Fasheh65ed39d2007-08-28 17:13:23 -07002165 /*
2166 * Skip the O_DIRECT checks if we don't need
2167 * them.
2168 */
2169 if (!direct_io || !(*direct_io))
2170 break;
Mark Fasheh9517bac2007-02-09 20:24:12 -08002171
Mark Fasheh65ed39d2007-08-28 17:13:23 -07002172 /*
Mark Fasheh1afc32b2007-09-07 14:46:51 -07002173 * There's no sane way to do direct writes to an inode
2174 * with inline data.
2175 */
2176 if (OCFS2_I(inode)->ip_dyn_features & OCFS2_INLINE_DATA_FL) {
2177 *direct_io = 0;
2178 break;
2179 }
2180
2181 /*
Mark Fasheh65ed39d2007-08-28 17:13:23 -07002182 * Allowing concurrent direct writes means
2183 * i_size changes wouldn't be synchronized, so
2184 * one node could wind up truncating another
2185 * nodes writes.
2186 */
2187 if (end > i_size_read(inode)) {
2188 *direct_io = 0;
Mark Fasheh9517bac2007-02-09 20:24:12 -08002189 break;
2190 }
2191
Mark Fasheh3a0782d2007-01-17 12:53:31 -08002192 /*
Mark Fasheh65ed39d2007-08-28 17:13:23 -07002193 * We don't fill holes during direct io, so
2194 * check for them here. If any are found, the
2195 * caller will have to retake some cluster
2196 * locks and initiate the io as buffered.
Mark Fasheh3a0782d2007-01-17 12:53:31 -08002197 */
Mark Fasheh65ed39d2007-08-28 17:13:23 -07002198 ret = ocfs2_check_range_for_holes(inode, saved_pos, count);
2199 if (ret == 1) {
2200 *direct_io = 0;
2201 ret = 0;
2202 } else if (ret < 0)
2203 mlog_errno(ret);
Mark Fashehccd979b2005-12-15 14:31:24 -08002204 break;
2205 }
2206
Tiger Yang8659ac22006-10-17 18:29:52 -07002207 if (appending)
2208 *ppos = saved_pos;
2209
2210out_unlock:
Tao Ma293b2f72009-08-25 08:02:48 +08002211 if (meta_level >= 0)
2212 ocfs2_inode_unlock(inode, meta_level);
Tiger Yang8659ac22006-10-17 18:29:52 -07002213
2214out:
2215 return ret;
2216}
2217
2218static ssize_t ocfs2_file_aio_write(struct kiocb *iocb,
2219 const struct iovec *iov,
2220 unsigned long nr_segs,
2221 loff_t pos)
2222{
Mark Fasheh9517bac2007-02-09 20:24:12 -08002223 int ret, direct_io, appending, rw_level, have_alloc_sem = 0;
Tao Ma86470e92009-12-03 21:55:05 +08002224 int can_do_direct, has_refcount = 0;
Mark Fasheh9517bac2007-02-09 20:24:12 -08002225 ssize_t written = 0;
2226 size_t ocount; /* original count */
2227 size_t count; /* after file limit checks */
Mark Fasheh9ea2d322007-10-18 14:14:45 -07002228 loff_t old_size, *ppos = &iocb->ki_pos;
2229 u32 old_clusters;
Mark Fasheh9517bac2007-02-09 20:24:12 -08002230 struct file *file = iocb->ki_filp;
2231 struct inode *inode = file->f_path.dentry->d_inode;
Mark Fasheh9ea2d322007-10-18 14:14:45 -07002232 struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
Tristan Ye7bdb0d12010-10-11 16:46:39 +08002233 int full_coherency = !(osb->s_mount_opt &
2234 OCFS2_MOUNT_COHERENCY_BUFFERED);
Tiger Yang8659ac22006-10-17 18:29:52 -07002235
Mark Fasheh9517bac2007-02-09 20:24:12 -08002236 mlog_entry("(0x%p, %u, '%.*s')\n", file,
Tiger Yang8659ac22006-10-17 18:29:52 -07002237 (unsigned int)nr_segs,
Mark Fasheh9517bac2007-02-09 20:24:12 -08002238 file->f_path.dentry->d_name.len,
2239 file->f_path.dentry->d_name.name);
Tiger Yang8659ac22006-10-17 18:29:52 -07002240
Tiger Yang8659ac22006-10-17 18:29:52 -07002241 if (iocb->ki_left == 0)
2242 return 0;
2243
Mark Fasheh9517bac2007-02-09 20:24:12 -08002244 vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
2245
2246 appending = file->f_flags & O_APPEND ? 1 : 0;
2247 direct_io = file->f_flags & O_DIRECT ? 1 : 0;
2248
Tiger Yang8659ac22006-10-17 18:29:52 -07002249 mutex_lock(&inode->i_mutex);
Mark Fasheh9517bac2007-02-09 20:24:12 -08002250
Tristan Ye39c99f12010-12-07 14:35:07 +08002251 ocfs2_iocb_clear_sem_locked(iocb);
2252
Mark Fasheh9517bac2007-02-09 20:24:12 -08002253relock:
Tiger Yang8659ac22006-10-17 18:29:52 -07002254 /* to match setattr's i_mutex -> i_alloc_sem -> rw_lock ordering */
Mark Fasheh9517bac2007-02-09 20:24:12 -08002255 if (direct_io) {
Tiger Yang8659ac22006-10-17 18:29:52 -07002256 down_read(&inode->i_alloc_sem);
Mark Fasheh9517bac2007-02-09 20:24:12 -08002257 have_alloc_sem = 1;
Tristan Ye39c99f12010-12-07 14:35:07 +08002258 /* communicate with ocfs2_dio_end_io */
2259 ocfs2_iocb_set_sem_locked(iocb);
Tiger Yang8659ac22006-10-17 18:29:52 -07002260 }
2261
Tristan Ye7bdb0d12010-10-11 16:46:39 +08002262 /*
2263 * Concurrent O_DIRECT writes are allowed with
2264 * mount_option "coherency=buffered".
2265 */
2266 rw_level = (!direct_io || full_coherency);
2267
Tiger Yang8659ac22006-10-17 18:29:52 -07002268 ret = ocfs2_rw_lock(inode, rw_level);
2269 if (ret < 0) {
Mark Fasheh9517bac2007-02-09 20:24:12 -08002270 mlog_errno(ret);
2271 goto out_sems;
2272 }
2273
Tristan Ye7bdb0d12010-10-11 16:46:39 +08002274 /*
2275 * O_DIRECT writes with "coherency=full" need to take EX cluster
2276 * inode_lock to guarantee coherency.
2277 */
2278 if (direct_io && full_coherency) {
2279 /*
2280 * We need to take and drop the inode lock to force
2281 * other nodes to drop their caches. Buffered I/O
2282 * already does this in write_begin().
2283 */
2284 ret = ocfs2_inode_lock(inode, NULL, 1);
2285 if (ret < 0) {
2286 mlog_errno(ret);
2287 goto out_sems;
2288 }
2289
2290 ocfs2_inode_unlock(inode, 1);
2291 }
2292
Mark Fasheh9517bac2007-02-09 20:24:12 -08002293 can_do_direct = direct_io;
Tao Mab8908232010-08-12 10:27:14 +08002294 ret = ocfs2_prepare_inode_for_write(file, ppos,
Mark Fasheh9517bac2007-02-09 20:24:12 -08002295 iocb->ki_left, appending,
Tao Ma86470e92009-12-03 21:55:05 +08002296 &can_do_direct, &has_refcount);
Mark Fasheh9517bac2007-02-09 20:24:12 -08002297 if (ret < 0) {
Tiger Yang8659ac22006-10-17 18:29:52 -07002298 mlog_errno(ret);
2299 goto out;
2300 }
2301
Mark Fasheh9517bac2007-02-09 20:24:12 -08002302 /*
2303 * We can't complete the direct I/O as requested, fall back to
2304 * buffered I/O.
2305 */
2306 if (direct_io && !can_do_direct) {
2307 ocfs2_rw_unlock(inode, rw_level);
2308 up_read(&inode->i_alloc_sem);
2309
2310 have_alloc_sem = 0;
2311 rw_level = -1;
2312
2313 direct_io = 0;
Mark Fasheh9517bac2007-02-09 20:24:12 -08002314 goto relock;
Tiger Yang8659ac22006-10-17 18:29:52 -07002315 }
Mark Fashehccd979b2005-12-15 14:31:24 -08002316
Mark Fasheh9ea2d322007-10-18 14:14:45 -07002317 /*
2318 * To later detect whether a journal commit for sync writes is
2319 * necessary, we sample i_size, and cluster count here.
2320 */
2321 old_size = i_size_read(inode);
2322 old_clusters = OCFS2_I(inode)->ip_clusters;
2323
Mark Fashehccd979b2005-12-15 14:31:24 -08002324 /* communicate with ocfs2_dio_end_io */
Mark Fasheh7cdfc3a2007-04-16 17:28:51 -07002325 ocfs2_iocb_set_rw_locked(iocb, rw_level);
Mark Fashehccd979b2005-12-15 14:31:24 -08002326
Li Dongyang6b933c82010-04-17 17:49:10 +08002327 ret = generic_segment_checks(iov, &nr_segs, &ocount,
2328 VERIFY_READ);
2329 if (ret)
2330 goto out_dio;
2331
2332 count = ocount;
2333 ret = generic_write_checks(file, ppos, &count,
2334 S_ISBLK(inode->i_mode));
2335 if (ret)
2336 goto out_dio;
2337
Mark Fasheh9517bac2007-02-09 20:24:12 -08002338 if (direct_io) {
2339 written = generic_file_direct_write(iocb, iov, &nr_segs, *ppos,
2340 ppos, count, ocount);
2341 if (written < 0) {
2342 ret = written;
2343 goto out_dio;
2344 }
2345 } else {
Li Dongyang6b933c82010-04-17 17:49:10 +08002346 current->backing_dev_info = file->f_mapping->backing_dev_info;
2347 written = generic_file_buffered_write(iocb, iov, nr_segs, *ppos,
2348 ppos, count, 0);
2349 current->backing_dev_info = NULL;
Mark Fasheh9517bac2007-02-09 20:24:12 -08002350 }
Mark Fashehccd979b2005-12-15 14:31:24 -08002351
Mark Fasheh9517bac2007-02-09 20:24:12 -08002352out_dio:
Mark Fashehccd979b2005-12-15 14:31:24 -08002353 /* buffered aio wouldn't have proper lock coverage today */
Mark Fasheh9517bac2007-02-09 20:24:12 -08002354 BUG_ON(ret == -EIOCBQUEUED && !(file->f_flags & O_DIRECT));
Mark Fashehccd979b2005-12-15 14:31:24 -08002355
Tao Ma60c48672010-02-03 09:56:04 +08002356 if (((file->f_flags & O_DSYNC) && !direct_io) || IS_SYNC(inode) ||
Tristan Ye81c8c822010-08-19 15:15:00 +08002357 ((file->f_flags & O_DIRECT) && !direct_io)) {
Jan Kara918941a2009-08-17 18:50:08 +02002358 ret = filemap_fdatawrite_range(file->f_mapping, pos,
2359 pos + count - 1);
2360 if (ret < 0)
2361 written = ret;
2362
Coly Lia03ab782010-03-26 05:15:12 +08002363 if (!ret && ((old_size != i_size_read(inode)) ||
2364 (old_clusters != OCFS2_I(inode)->ip_clusters) ||
2365 has_refcount)) {
Joel Becker2b4e30f2008-09-03 20:03:41 -07002366 ret = jbd2_journal_force_commit(osb->journal->j_journal);
Mark Fasheh9ea2d322007-10-18 14:14:45 -07002367 if (ret < 0)
2368 written = ret;
2369 }
Jan Kara918941a2009-08-17 18:50:08 +02002370
2371 if (!ret)
2372 ret = filemap_fdatawait_range(file->f_mapping, pos,
2373 pos + count - 1);
Mark Fasheh9ea2d322007-10-18 14:14:45 -07002374 }
2375
Sunil Mushran2bd63212010-01-25 16:57:38 -08002376 /*
Mark Fashehccd979b2005-12-15 14:31:24 -08002377 * deep in g_f_a_w_n()->ocfs2_direct_IO we pass in a ocfs2_dio_end_io
2378 * function pointer which is called when o_direct io completes so that
2379 * it can unlock our rw lock. (it's the clustered equivalent of
2380 * i_alloc_sem; protects truncate from racing with pending ios).
2381 * Unfortunately there are error cases which call end_io and others
2382 * that don't. so we don't have to unlock the rw_lock if either an
2383 * async dio is going to do it in the future or an end_io after an
2384 * error has already done it.
2385 */
Coly Li66b116c2010-02-25 14:57:13 +08002386 if ((ret == -EIOCBQUEUED) || (!ocfs2_iocb_is_rw_locked(iocb))) {
Mark Fashehccd979b2005-12-15 14:31:24 -08002387 rw_level = -1;
2388 have_alloc_sem = 0;
2389 }
2390
2391out:
Mark Fasheh9517bac2007-02-09 20:24:12 -08002392 if (rw_level != -1)
2393 ocfs2_rw_unlock(inode, rw_level);
2394
2395out_sems:
Tristan Ye39c99f12010-12-07 14:35:07 +08002396 if (have_alloc_sem) {
Mark Fashehccd979b2005-12-15 14:31:24 -08002397 up_read(&inode->i_alloc_sem);
Tristan Ye39c99f12010-12-07 14:35:07 +08002398 ocfs2_iocb_clear_sem_locked(iocb);
2399 }
Mark Fasheh9517bac2007-02-09 20:24:12 -08002400
Jes Sorensen1b1dcc12006-01-09 15:59:24 -08002401 mutex_unlock(&inode->i_mutex);
Mark Fashehccd979b2005-12-15 14:31:24 -08002402
Wengang Wang812e7a62009-07-10 13:26:04 +08002403 if (written)
2404 ret = written;
Mark Fashehccd979b2005-12-15 14:31:24 -08002405 mlog_exit(ret);
Wengang Wang812e7a62009-07-10 13:26:04 +08002406 return ret;
Mark Fashehccd979b2005-12-15 14:31:24 -08002407}
2408
Miklos Szeredi328eaab2009-04-14 19:48:39 +02002409static int ocfs2_splice_to_file(struct pipe_inode_info *pipe,
2410 struct file *out,
2411 struct splice_desc *sd)
2412{
2413 int ret;
2414
Tao Mab8908232010-08-12 10:27:14 +08002415 ret = ocfs2_prepare_inode_for_write(out, &sd->pos,
Tao Ma86470e92009-12-03 21:55:05 +08002416 sd->total_len, 0, NULL, NULL);
Miklos Szeredi328eaab2009-04-14 19:48:39 +02002417 if (ret < 0) {
2418 mlog_errno(ret);
2419 return ret;
2420 }
2421
2422 return splice_from_pipe_feed(pipe, sd, pipe_to_file);
2423}
2424
Tiger Yang8659ac22006-10-17 18:29:52 -07002425static ssize_t ocfs2_file_splice_write(struct pipe_inode_info *pipe,
2426 struct file *out,
2427 loff_t *ppos,
2428 size_t len,
2429 unsigned int flags)
2430{
2431 int ret;
Miklos Szeredi328eaab2009-04-14 19:48:39 +02002432 struct address_space *mapping = out->f_mapping;
2433 struct inode *inode = mapping->host;
2434 struct splice_desc sd = {
2435 .total_len = len,
2436 .flags = flags,
2437 .pos = *ppos,
2438 .u.file = out,
2439 };
Tiger Yang8659ac22006-10-17 18:29:52 -07002440
2441 mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", out, pipe,
2442 (unsigned int)len,
Josef Sipekd28c9172006-12-08 02:37:25 -08002443 out->f_path.dentry->d_name.len,
2444 out->f_path.dentry->d_name.name);
Tiger Yang8659ac22006-10-17 18:29:52 -07002445
Miklos Szeredi7bfac9e2009-04-06 17:41:00 +02002446 if (pipe->inode)
Miklos Szeredi328eaab2009-04-14 19:48:39 +02002447 mutex_lock_nested(&pipe->inode->i_mutex, I_MUTEX_PARENT);
2448
2449 splice_from_pipe_begin(&sd);
2450 do {
2451 ret = splice_from_pipe_next(pipe, &sd);
2452 if (ret <= 0)
2453 break;
2454
2455 mutex_lock_nested(&inode->i_mutex, I_MUTEX_CHILD);
2456 ret = ocfs2_rw_lock(inode, 1);
2457 if (ret < 0)
2458 mlog_errno(ret);
2459 else {
2460 ret = ocfs2_splice_to_file(pipe, out, &sd);
2461 ocfs2_rw_unlock(inode, 1);
2462 }
2463 mutex_unlock(&inode->i_mutex);
2464 } while (ret > 0);
2465 splice_from_pipe_end(pipe, &sd);
2466
Miklos Szeredi7bfac9e2009-04-06 17:41:00 +02002467 if (pipe->inode)
2468 mutex_unlock(&pipe->inode->i_mutex);
Tiger Yang8659ac22006-10-17 18:29:52 -07002469
Miklos Szeredi328eaab2009-04-14 19:48:39 +02002470 if (sd.num_spliced)
2471 ret = sd.num_spliced;
2472
2473 if (ret > 0) {
2474 unsigned long nr_pages;
Jan Karad23c9372009-08-18 18:24:31 +02002475 int err;
Miklos Szeredi328eaab2009-04-14 19:48:39 +02002476
Miklos Szeredi328eaab2009-04-14 19:48:39 +02002477 nr_pages = (ret + PAGE_CACHE_SIZE - 1) >> PAGE_CACHE_SHIFT;
2478
Jan Karad23c9372009-08-18 18:24:31 +02002479 err = generic_write_sync(out, *ppos, ret);
2480 if (err)
2481 ret = err;
2482 else
2483 *ppos += ret;
Miklos Szeredi328eaab2009-04-14 19:48:39 +02002484
Miklos Szeredi328eaab2009-04-14 19:48:39 +02002485 balance_dirty_pages_ratelimited_nr(mapping, nr_pages);
2486 }
Tiger Yang8659ac22006-10-17 18:29:52 -07002487
2488 mlog_exit(ret);
2489 return ret;
2490}
2491
2492static ssize_t ocfs2_file_splice_read(struct file *in,
2493 loff_t *ppos,
2494 struct pipe_inode_info *pipe,
2495 size_t len,
2496 unsigned int flags)
2497{
Tao Ma1962f392009-06-19 15:36:52 +08002498 int ret = 0, lock_level = 0;
Josef Sipekd28c9172006-12-08 02:37:25 -08002499 struct inode *inode = in->f_path.dentry->d_inode;
Tiger Yang8659ac22006-10-17 18:29:52 -07002500
2501 mlog_entry("(0x%p, 0x%p, %u, '%.*s')\n", in, pipe,
2502 (unsigned int)len,
Josef Sipekd28c9172006-12-08 02:37:25 -08002503 in->f_path.dentry->d_name.len,
2504 in->f_path.dentry->d_name.name);
Tiger Yang8659ac22006-10-17 18:29:52 -07002505
2506 /*
2507 * See the comment in ocfs2_file_aio_read()
2508 */
Tao Ma1962f392009-06-19 15:36:52 +08002509 ret = ocfs2_inode_lock_atime(inode, in->f_vfsmnt, &lock_level);
Tiger Yang8659ac22006-10-17 18:29:52 -07002510 if (ret < 0) {
2511 mlog_errno(ret);
2512 goto bail;
2513 }
Tao Ma1962f392009-06-19 15:36:52 +08002514 ocfs2_inode_unlock(inode, lock_level);
Tiger Yang8659ac22006-10-17 18:29:52 -07002515
2516 ret = generic_file_splice_read(in, ppos, pipe, len, flags);
2517
2518bail:
2519 mlog_exit(ret);
2520 return ret;
2521}
2522
Mark Fashehccd979b2005-12-15 14:31:24 -08002523static ssize_t ocfs2_file_aio_read(struct kiocb *iocb,
Badari Pulavarty027445c2006-09-30 23:28:46 -07002524 const struct iovec *iov,
2525 unsigned long nr_segs,
Mark Fashehccd979b2005-12-15 14:31:24 -08002526 loff_t pos)
2527{
Tiger Yang25899de2006-11-15 15:49:02 +08002528 int ret = 0, rw_level = -1, have_alloc_sem = 0, lock_level = 0;
Mark Fashehccd979b2005-12-15 14:31:24 -08002529 struct file *filp = iocb->ki_filp;
Josef Sipekd28c9172006-12-08 02:37:25 -08002530 struct inode *inode = filp->f_path.dentry->d_inode;
Mark Fashehccd979b2005-12-15 14:31:24 -08002531
Badari Pulavarty027445c2006-09-30 23:28:46 -07002532 mlog_entry("(0x%p, %u, '%.*s')\n", filp,
2533 (unsigned int)nr_segs,
Josef Sipekd28c9172006-12-08 02:37:25 -08002534 filp->f_path.dentry->d_name.len,
2535 filp->f_path.dentry->d_name.name);
Mark Fashehccd979b2005-12-15 14:31:24 -08002536
2537 if (!inode) {
2538 ret = -EINVAL;
2539 mlog_errno(ret);
2540 goto bail;
2541 }
2542
Tristan Ye39c99f12010-12-07 14:35:07 +08002543 ocfs2_iocb_clear_sem_locked(iocb);
2544
Sunil Mushran2bd63212010-01-25 16:57:38 -08002545 /*
Mark Fashehccd979b2005-12-15 14:31:24 -08002546 * buffered reads protect themselves in ->readpage(). O_DIRECT reads
2547 * need locks to protect pending reads from racing with truncate.
2548 */
2549 if (filp->f_flags & O_DIRECT) {
2550 down_read(&inode->i_alloc_sem);
2551 have_alloc_sem = 1;
Tristan Ye39c99f12010-12-07 14:35:07 +08002552 ocfs2_iocb_set_sem_locked(iocb);
Mark Fashehccd979b2005-12-15 14:31:24 -08002553
2554 ret = ocfs2_rw_lock(inode, 0);
2555 if (ret < 0) {
2556 mlog_errno(ret);
2557 goto bail;
2558 }
2559 rw_level = 0;
2560 /* communicate with ocfs2_dio_end_io */
Mark Fasheh7cdfc3a2007-04-16 17:28:51 -07002561 ocfs2_iocb_set_rw_locked(iocb, rw_level);
Mark Fashehccd979b2005-12-15 14:31:24 -08002562 }
2563
Mark Fashehc4374f82006-05-05 19:04:35 -07002564 /*
2565 * We're fine letting folks race truncates and extending
2566 * writes with read across the cluster, just like they can
2567 * locally. Hence no rw_lock during read.
Sunil Mushran2bd63212010-01-25 16:57:38 -08002568 *
Mark Fashehc4374f82006-05-05 19:04:35 -07002569 * Take and drop the meta data lock to update inode fields
2570 * like i_size. This allows the checks down below
Sunil Mushran2bd63212010-01-25 16:57:38 -08002571 * generic_file_aio_read() a chance of actually working.
Mark Fashehc4374f82006-05-05 19:04:35 -07002572 */
Mark Fashehe63aecb62007-10-18 15:30:42 -07002573 ret = ocfs2_inode_lock_atime(inode, filp->f_vfsmnt, &lock_level);
Mark Fashehc4374f82006-05-05 19:04:35 -07002574 if (ret < 0) {
2575 mlog_errno(ret);
2576 goto bail;
2577 }
Mark Fashehe63aecb62007-10-18 15:30:42 -07002578 ocfs2_inode_unlock(inode, lock_level);
Mark Fashehc4374f82006-05-05 19:04:35 -07002579
Badari Pulavarty027445c2006-09-30 23:28:46 -07002580 ret = generic_file_aio_read(iocb, iov, nr_segs, iocb->ki_pos);
Mark Fashehccd979b2005-12-15 14:31:24 -08002581 if (ret == -EINVAL)
Sunil Mushran56753bd2008-06-09 11:24:41 -07002582 mlog(0, "generic_file_aio_read returned -EINVAL\n");
Mark Fashehccd979b2005-12-15 14:31:24 -08002583
2584 /* buffered aio wouldn't have proper lock coverage today */
2585 BUG_ON(ret == -EIOCBQUEUED && !(filp->f_flags & O_DIRECT));
2586
2587 /* see ocfs2_file_aio_write */
2588 if (ret == -EIOCBQUEUED || !ocfs2_iocb_is_rw_locked(iocb)) {
2589 rw_level = -1;
2590 have_alloc_sem = 0;
2591 }
2592
2593bail:
Tristan Ye39c99f12010-12-07 14:35:07 +08002594 if (have_alloc_sem) {
Mark Fashehccd979b2005-12-15 14:31:24 -08002595 up_read(&inode->i_alloc_sem);
Tristan Ye39c99f12010-12-07 14:35:07 +08002596 ocfs2_iocb_clear_sem_locked(iocb);
2597 }
Sunil Mushran2bd63212010-01-25 16:57:38 -08002598 if (rw_level != -1)
Mark Fashehccd979b2005-12-15 14:31:24 -08002599 ocfs2_rw_unlock(inode, rw_level);
2600 mlog_exit(ret);
2601
2602 return ret;
2603}
2604
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -08002605const struct inode_operations ocfs2_file_iops = {
Mark Fashehccd979b2005-12-15 14:31:24 -08002606 .setattr = ocfs2_setattr,
2607 .getattr = ocfs2_getattr,
Tiger Yangd38eb8d2006-11-27 09:59:21 +08002608 .permission = ocfs2_permission,
Tiger Yangcf1d6c72008-08-18 17:11:00 +08002609 .setxattr = generic_setxattr,
2610 .getxattr = generic_getxattr,
2611 .listxattr = ocfs2_listxattr,
2612 .removexattr = generic_removexattr,
Mark Fasheh00dc4172008-10-03 17:32:11 -04002613 .fiemap = ocfs2_fiemap,
Mark Fashehccd979b2005-12-15 14:31:24 -08002614};
2615
Arjan van de Ven92e1d5b2007-02-12 00:55:39 -08002616const struct inode_operations ocfs2_special_file_iops = {
Mark Fashehccd979b2005-12-15 14:31:24 -08002617 .setattr = ocfs2_setattr,
2618 .getattr = ocfs2_getattr,
Tiger Yangd38eb8d2006-11-27 09:59:21 +08002619 .permission = ocfs2_permission,
Mark Fashehccd979b2005-12-15 14:31:24 -08002620};
2621
Mark Fasheh53da4932008-07-21 14:29:16 -07002622/*
2623 * Other than ->lock, keep ocfs2_fops and ocfs2_dops in sync with
2624 * ocfs2_fops_no_plocks and ocfs2_dops_no_plocks!
2625 */
Arjan van de Ven4b6f5d22006-03-28 01:56:42 -08002626const struct file_operations ocfs2_fops = {
Jan Kara32c3c0e2007-12-19 15:24:52 +01002627 .llseek = generic_file_llseek,
Mark Fashehccd979b2005-12-15 14:31:24 -08002628 .read = do_sync_read,
2629 .write = do_sync_write,
Mark Fashehccd979b2005-12-15 14:31:24 -08002630 .mmap = ocfs2_mmap,
2631 .fsync = ocfs2_sync_file,
2632 .release = ocfs2_file_release,
2633 .open = ocfs2_file_open,
2634 .aio_read = ocfs2_file_aio_read,
2635 .aio_write = ocfs2_file_aio_write,
Andi Kleenc9ec1482008-01-27 03:17:17 +01002636 .unlocked_ioctl = ocfs2_ioctl,
Mark Fasheh586d2322007-03-09 15:56:28 -08002637#ifdef CONFIG_COMPAT
2638 .compat_ioctl = ocfs2_compat_ioctl,
2639#endif
Mark Fasheh53da4932008-07-21 14:29:16 -07002640 .lock = ocfs2_lock,
2641 .flock = ocfs2_flock,
2642 .splice_read = ocfs2_file_splice_read,
2643 .splice_write = ocfs2_file_splice_write,
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01002644 .fallocate = ocfs2_fallocate,
Mark Fasheh53da4932008-07-21 14:29:16 -07002645};
2646
2647const struct file_operations ocfs2_dops = {
2648 .llseek = generic_file_llseek,
2649 .read = generic_read_dir,
2650 .readdir = ocfs2_readdir,
2651 .fsync = ocfs2_sync_file,
2652 .release = ocfs2_dir_release,
2653 .open = ocfs2_dir_open,
2654 .unlocked_ioctl = ocfs2_ioctl,
2655#ifdef CONFIG_COMPAT
2656 .compat_ioctl = ocfs2_compat_ioctl,
2657#endif
2658 .lock = ocfs2_lock,
2659 .flock = ocfs2_flock,
2660};
2661
2662/*
2663 * POSIX-lockless variants of our file_operations.
2664 *
2665 * These will be used if the underlying cluster stack does not support
2666 * posix file locking, if the user passes the "localflocks" mount
2667 * option, or if we have a local-only fs.
2668 *
2669 * ocfs2_flock is in here because all stacks handle UNIX file locks,
2670 * so we still want it in the case of no stack support for
2671 * plocks. Internally, it will do the right thing when asked to ignore
2672 * the cluster.
2673 */
2674const struct file_operations ocfs2_fops_no_plocks = {
2675 .llseek = generic_file_llseek,
2676 .read = do_sync_read,
2677 .write = do_sync_write,
2678 .mmap = ocfs2_mmap,
2679 .fsync = ocfs2_sync_file,
2680 .release = ocfs2_file_release,
2681 .open = ocfs2_file_open,
2682 .aio_read = ocfs2_file_aio_read,
2683 .aio_write = ocfs2_file_aio_write,
2684 .unlocked_ioctl = ocfs2_ioctl,
2685#ifdef CONFIG_COMPAT
2686 .compat_ioctl = ocfs2_compat_ioctl,
2687#endif
Mark Fasheh53fc6222007-12-20 16:49:04 -08002688 .flock = ocfs2_flock,
Tiger Yang8659ac22006-10-17 18:29:52 -07002689 .splice_read = ocfs2_file_splice_read,
2690 .splice_write = ocfs2_file_splice_write,
Mark Fashehccd979b2005-12-15 14:31:24 -08002691};
2692
Mark Fasheh53da4932008-07-21 14:29:16 -07002693const struct file_operations ocfs2_dops_no_plocks = {
Jan Kara32c3c0e2007-12-19 15:24:52 +01002694 .llseek = generic_file_llseek,
Mark Fashehccd979b2005-12-15 14:31:24 -08002695 .read = generic_read_dir,
2696 .readdir = ocfs2_readdir,
2697 .fsync = ocfs2_sync_file,
Mark Fasheh53fc6222007-12-20 16:49:04 -08002698 .release = ocfs2_dir_release,
2699 .open = ocfs2_dir_open,
Andi Kleenc9ec1482008-01-27 03:17:17 +01002700 .unlocked_ioctl = ocfs2_ioctl,
Mark Fasheh586d2322007-03-09 15:56:28 -08002701#ifdef CONFIG_COMPAT
2702 .compat_ioctl = ocfs2_compat_ioctl,
2703#endif
Mark Fasheh53fc6222007-12-20 16:49:04 -08002704 .flock = ocfs2_flock,
Mark Fashehccd979b2005-12-15 14:31:24 -08002705};