blob: 08369c6cd127a4fee6a301babe1fea80d475d2a3 [file] [log] [blame]
David Teiglandb3b94fa2006-01-16 16:50:04 +00001/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
Steven Whitehouse3a8a9a12006-05-18 15:09:15 -04003 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
David Teiglandb3b94fa2006-01-16 16:50:04 +00004 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
Steven Whitehousee9fc2aa2006-09-01 11:05:15 -04007 * of the GNU General Public License version 2.
David Teiglandb3b94fa2006-01-16 16:50:04 +00008 */
9
David Teiglandb3b94fa2006-01-16 16:50:04 +000010#include <linux/slab.h>
11#include <linux/spinlock.h>
12#include <linux/completion.h>
13#include <linux/buffer_head.h>
14#include <linux/pagemap.h>
15#include <linux/uio.h>
16#include <linux/blkdev.h>
17#include <linux/mm.h>
Miklos Szeredif58ba882008-07-02 21:12:01 +020018#include <linux/mount.h>
Steven Whitehouse18ec7d52006-02-08 11:50:51 +000019#include <linux/fs.h>
Steven Whitehouse5c676f62006-02-27 17:23:27 -050020#include <linux/gfs2_ondisk.h>
Christoph Hellwig2fe17c12011-01-14 13:07:43 +010021#include <linux/falloc.h>
22#include <linux/swap.h>
Steven Whitehouse71b86f52006-03-28 14:14:04 -050023#include <linux/crc32.h>
Steven Whitehouse33c3de32006-11-30 10:14:32 -050024#include <linux/writeback.h>
Linus Torvalds7c0f6ba2016-12-24 11:46:01 -080025#include <linux/uaccess.h>
Steven Whitehousef057f6c2009-01-12 10:43:39 +000026#include <linux/dlm.h>
27#include <linux/dlm_plock.h>
Bob Peterson2ddfbdd2014-08-20 12:44:45 -040028#include <linux/delay.h>
Andreas Gruenbacher64bc06b2018-06-24 15:04:04 +010029#include <linux/backing-dev.h>
David Teiglandb3b94fa2006-01-16 16:50:04 +000030
31#include "gfs2.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050032#include "incore.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000033#include "bmap.h"
Andreas Gruenbacher64bc06b2018-06-24 15:04:04 +010034#include "aops.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000035#include "dir.h"
36#include "glock.h"
37#include "glops.h"
38#include "inode.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000039#include "log.h"
40#include "meta_io.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000041#include "quota.h"
42#include "rgrp.h"
43#include "trans.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050044#include "util.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000045
David Teiglandb3b94fa2006-01-16 16:50:04 +000046/**
47 * gfs2_llseek - seek to a location in a file
48 * @file: the file
49 * @offset: the offset
Andrew Morton965c8e52012-12-17 15:59:39 -080050 * @whence: Where to seek from (SEEK_SET, SEEK_CUR, or SEEK_END)
David Teiglandb3b94fa2006-01-16 16:50:04 +000051 *
52 * SEEK_END requires the glock for the file because it references the
53 * file's size.
54 *
55 * Returns: The new offset, or errno
56 */
57
Andrew Morton965c8e52012-12-17 15:59:39 -080058static loff_t gfs2_llseek(struct file *file, loff_t offset, int whence)
David Teiglandb3b94fa2006-01-16 16:50:04 +000059{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -040060 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
David Teiglandb3b94fa2006-01-16 16:50:04 +000061 struct gfs2_holder i_gh;
62 loff_t error;
63
Andrew Morton965c8e52012-12-17 15:59:39 -080064 switch (whence) {
Andreas Gruenbacher3a274112017-03-15 19:12:59 +010065 case SEEK_END:
David Teiglandb3b94fa2006-01-16 16:50:04 +000066 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
67 &i_gh);
68 if (!error) {
Andrew Morton965c8e52012-12-17 15:59:39 -080069 error = generic_file_llseek(file, offset, whence);
David Teiglandb3b94fa2006-01-16 16:50:04 +000070 gfs2_glock_dq_uninit(&i_gh);
71 }
Steven Whitehouse94536152011-08-23 10:19:25 +010072 break;
Andreas Gruenbacher3a274112017-03-15 19:12:59 +010073
74 case SEEK_DATA:
75 error = gfs2_seek_data(file, offset);
76 break;
77
78 case SEEK_HOLE:
79 error = gfs2_seek_hole(file, offset);
80 break;
81
Steven Whitehouse94536152011-08-23 10:19:25 +010082 case SEEK_CUR:
83 case SEEK_SET:
Andreas Gruenbacher3a274112017-03-15 19:12:59 +010084 /*
85 * These don't reference inode->i_size and don't depend on the
86 * block mapping, so we don't need the glock.
87 */
Andrew Morton965c8e52012-12-17 15:59:39 -080088 error = generic_file_llseek(file, offset, whence);
Steven Whitehouse94536152011-08-23 10:19:25 +010089 break;
90 default:
91 error = -EINVAL;
92 }
David Teiglandb3b94fa2006-01-16 16:50:04 +000093
94 return error;
95}
96
David Teiglandb3b94fa2006-01-16 16:50:04 +000097/**
Al Virod81a8ef2013-05-16 14:14:48 -040098 * gfs2_readdir - Iterator for a directory
David Teiglandb3b94fa2006-01-16 16:50:04 +000099 * @file: The directory to read from
Al Virod81a8ef2013-05-16 14:14:48 -0400100 * @ctx: What to feed directory entries to
David Teiglandb3b94fa2006-01-16 16:50:04 +0000101 *
102 * Returns: errno
103 */
104
Al Virod81a8ef2013-05-16 14:14:48 -0400105static int gfs2_readdir(struct file *file, struct dir_context *ctx)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000106{
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500107 struct inode *dir = file->f_mapping->host;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400108 struct gfs2_inode *dip = GFS2_I(dir);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000109 struct gfs2_holder d_gh;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000110 int error;
111
Al Virod81a8ef2013-05-16 14:14:48 -0400112 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
113 if (error)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000114 return error;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000115
Al Virod81a8ef2013-05-16 14:14:48 -0400116 error = gfs2_dir_read(dir, ctx, &file->f_ra);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000117
118 gfs2_glock_dq_uninit(&d_gh);
119
David Teiglandb3b94fa2006-01-16 16:50:04 +0000120 return error;
121}
122
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400123/**
Andreas Gruenbacherb16f7e52017-10-09 16:15:30 +0200124 * fsflag_gfs2flag
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400125 *
Andreas Gruenbacherb16f7e52017-10-09 16:15:30 +0200126 * The FS_JOURNAL_DATA_FL flag maps to GFS2_DIF_INHERIT_JDATA for directories,
127 * and to GFS2_DIF_JDATA for non-directories.
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400128 */
Andreas Gruenbacherb16f7e52017-10-09 16:15:30 +0200129static struct {
130 u32 fsflag;
131 u32 gfsflag;
132} fsflag_gfs2flag[] = {
133 {FS_SYNC_FL, GFS2_DIF_SYNC},
134 {FS_IMMUTABLE_FL, GFS2_DIF_IMMUTABLE},
135 {FS_APPEND_FL, GFS2_DIF_APPENDONLY},
136 {FS_NOATIME_FL, GFS2_DIF_NOATIME},
137 {FS_INDEX_FL, GFS2_DIF_EXHASH},
138 {FS_TOPDIR_FL, GFS2_DIF_TOPDIR},
139 {FS_JOURNAL_DATA_FL, GFS2_DIF_JDATA | GFS2_DIF_INHERIT_JDATA},
Steven Whitehouse7ea9ea82006-03-31 15:01:28 -0500140};
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500141
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400142static int gfs2_get_flags(struct file *filp, u32 __user *ptr)
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500143{
Al Viro496ad9a2013-01-23 17:07:38 -0500144 struct inode *inode = file_inode(filp);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400145 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500146 struct gfs2_holder gh;
Andreas Gruenbacherb16f7e52017-10-09 16:15:30 +0200147 int i, error;
148 u32 gfsflags, fsflags = 0;
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500149
Steven Whitehouse719ee342008-09-18 13:53:59 +0100150 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
151 error = gfs2_glock_nq(&gh);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500152 if (error)
Daniel DeFreez9c7fe832016-04-19 19:57:45 -0400153 goto out_uninit;
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400154
Andreas Gruenbacherb16f7e52017-10-09 16:15:30 +0200155 gfsflags = ip->i_diskflags;
156 if (S_ISDIR(inode->i_mode))
157 gfsflags &= ~GFS2_DIF_JDATA;
158 else
159 gfsflags &= ~GFS2_DIF_INHERIT_JDATA;
160 for (i = 0; i < ARRAY_SIZE(fsflag_gfs2flag); i++)
161 if (gfsflags & fsflag_gfs2flag[i].gfsflag)
162 fsflags |= fsflag_gfs2flag[i].fsflag;
163
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400164 if (put_user(fsflags, ptr))
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500165 error = -EFAULT;
166
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100167 gfs2_glock_dq(&gh);
Daniel DeFreez9c7fe832016-04-19 19:57:45 -0400168out_uninit:
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500169 gfs2_holder_uninit(&gh);
170 return error;
171}
172
Steven Whitehouse6b124d82006-11-08 12:51:06 -0500173void gfs2_set_inode_flags(struct inode *inode)
174{
175 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehouse6b124d82006-11-08 12:51:06 -0500176 unsigned int flags = inode->i_flags;
177
Steven Whitehouse9964afb2011-06-16 14:06:55 +0100178 flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC|S_NOSEC);
179 if ((ip->i_eattr == 0) && !is_sxid(inode->i_mode))
Benjamin Marzinski01e64ee2015-05-05 12:25:48 -0500180 flags |= S_NOSEC;
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000181 if (ip->i_diskflags & GFS2_DIF_IMMUTABLE)
Steven Whitehouse6b124d82006-11-08 12:51:06 -0500182 flags |= S_IMMUTABLE;
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000183 if (ip->i_diskflags & GFS2_DIF_APPENDONLY)
Steven Whitehouse6b124d82006-11-08 12:51:06 -0500184 flags |= S_APPEND;
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000185 if (ip->i_diskflags & GFS2_DIF_NOATIME)
Steven Whitehouse6b124d82006-11-08 12:51:06 -0500186 flags |= S_NOATIME;
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000187 if (ip->i_diskflags & GFS2_DIF_SYNC)
Steven Whitehouse6b124d82006-11-08 12:51:06 -0500188 flags |= S_SYNC;
189 inode->i_flags = flags;
190}
191
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500192/* Flags that can be set by user space */
193#define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA| \
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500194 GFS2_DIF_IMMUTABLE| \
195 GFS2_DIF_APPENDONLY| \
196 GFS2_DIF_NOATIME| \
197 GFS2_DIF_SYNC| \
Steven Whitehouse23d0bb82012-05-28 15:26:56 +0100198 GFS2_DIF_TOPDIR| \
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500199 GFS2_DIF_INHERIT_JDATA)
200
201/**
Fabian Frederick9dd868e2014-05-15 18:57:08 +0200202 * do_gfs2_set_flags - set flags on an inode
203 * @filp: file pointer
204 * @reqflags: The flags to set
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500205 * @mask: Indicates which flags are valid
206 *
207 */
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400208static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask)
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500209{
Al Viro496ad9a2013-01-23 17:07:38 -0500210 struct inode *inode = file_inode(filp);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400211 struct gfs2_inode *ip = GFS2_I(inode);
212 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500213 struct buffer_head *bh;
214 struct gfs2_holder gh;
215 int error;
Steven Whitehouse55eccc62006-04-04 14:29:30 -0400216 u32 new_flags, flags;
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500217
Al Viroa561be72011-11-23 11:57:51 -0500218 error = mnt_want_write_file(filp);
Abhijith Das52f341c2006-07-21 02:03:21 -0400219 if (error)
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500220 return error;
221
Miklos Szeredif58ba882008-07-02 21:12:01 +0200222 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
223 if (error)
224 goto out_drop_write;
225
Steven Whitehouse7df0e032010-05-24 14:36:48 +0100226 error = -EACCES;
Serge E. Hallyn2e149672011-03-23 16:43:26 -0700227 if (!inode_owner_or_capable(inode))
Steven Whitehouse7df0e032010-05-24 14:36:48 +0100228 goto out;
229
230 error = 0;
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000231 flags = ip->i_diskflags;
Steven Whitehouse55eccc62006-04-04 14:29:30 -0400232 new_flags = (flags & ~mask) | (reqflags & mask);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500233 if ((new_flags ^ flags) == 0)
234 goto out;
235
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500236 error = -EPERM;
237 if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE))
238 goto out;
239 if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY))
240 goto out;
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400241 if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) &&
Steven Whitehouseb9cb9812006-05-12 17:07:56 -0400242 !capable(CAP_LINUX_IMMUTABLE))
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500243 goto out;
Steven Whitehouseb9cb9812006-05-12 17:07:56 -0400244 if (!IS_IMMUTABLE(inode)) {
Al Viro10556cb22011-06-20 19:28:19 -0400245 error = gfs2_permission(inode, MAY_WRITE);
Steven Whitehouseb9cb9812006-05-12 17:07:56 -0400246 if (error)
247 goto out;
248 }
Steven Whitehouse55610932007-10-17 08:47:38 +0100249 if ((flags ^ new_flags) & GFS2_DIF_JDATA) {
Bob Petersoncc555b092017-09-20 08:30:04 -0500250 if (new_flags & GFS2_DIF_JDATA)
Bob Petersonc1696fb2018-01-17 00:01:33 +0100251 gfs2_log_flush(sdp, ip->i_gl,
Bob Peterson805c09072018-01-08 10:34:17 -0500252 GFS2_LOG_HEAD_FLUSH_NORMAL |
253 GFS2_LFC_SET_FLAGS);
Steven Whitehouse55610932007-10-17 08:47:38 +0100254 error = filemap_fdatawrite(inode->i_mapping);
255 if (error)
256 goto out;
257 error = filemap_fdatawait(inode->i_mapping);
258 if (error)
259 goto out;
Bob Petersoncc555b092017-09-20 08:30:04 -0500260 if (new_flags & GFS2_DIF_JDATA)
261 gfs2_ordered_del_inode(ip);
Steven Whitehouse55610932007-10-17 08:47:38 +0100262 }
Steven Whitehouse55eccc62006-04-04 14:29:30 -0400263 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500264 if (error)
265 goto out;
Steven Whitehouse55eccc62006-04-04 14:29:30 -0400266 error = gfs2_meta_inode_buffer(ip, &bh);
267 if (error)
268 goto out_trans_end;
Andreas Gruenbacher9b7c2dd2017-09-22 08:29:19 -0500269 inode->i_ctime = current_time(inode);
Steven Whitehouse350a9b02012-12-14 12:36:02 +0000270 gfs2_trans_add_meta(ip->i_gl, bh);
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000271 ip->i_diskflags = new_flags;
Steven Whitehouse539e5d62006-10-31 15:07:05 -0500272 gfs2_dinode_out(ip, bh->b_data);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500273 brelse(bh);
Steven Whitehouse6b124d82006-11-08 12:51:06 -0500274 gfs2_set_inode_flags(inode);
Steven Whitehouse55610932007-10-17 08:47:38 +0100275 gfs2_set_aops(inode);
Steven Whitehouse55eccc62006-04-04 14:29:30 -0400276out_trans_end:
277 gfs2_trans_end(sdp);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500278out:
279 gfs2_glock_dq_uninit(&gh);
Miklos Szeredif58ba882008-07-02 21:12:01 +0200280out_drop_write:
Al Viro2a79f172011-12-09 08:06:57 -0500281 mnt_drop_write_file(filp);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500282 return error;
283}
284
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400285static int gfs2_set_flags(struct file *filp, u32 __user *ptr)
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500286{
Al Viro496ad9a2013-01-23 17:07:38 -0500287 struct inode *inode = file_inode(filp);
Andreas Gruenbacherb16f7e52017-10-09 16:15:30 +0200288 u32 fsflags, gfsflags = 0;
289 u32 mask;
290 int i;
Steven Whitehouse7df0e032010-05-24 14:36:48 +0100291
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400292 if (get_user(fsflags, ptr))
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500293 return -EFAULT;
Steven Whitehouse7df0e032010-05-24 14:36:48 +0100294
Andreas Gruenbacherb16f7e52017-10-09 16:15:30 +0200295 for (i = 0; i < ARRAY_SIZE(fsflag_gfs2flag); i++) {
296 if (fsflags & fsflag_gfs2flag[i].fsflag) {
297 fsflags &= ~fsflag_gfs2flag[i].fsflag;
298 gfsflags |= fsflag_gfs2flag[i].gfsflag;
299 }
Steven Whitehouseb9af7ca2007-07-18 11:40:06 +0100300 }
Andreas Gruenbacherb16f7e52017-10-09 16:15:30 +0200301 if (fsflags || gfsflags & ~GFS2_FLAGS_USER_SET)
302 return -EINVAL;
303
304 mask = GFS2_FLAGS_USER_SET;
305 if (S_ISDIR(inode->i_mode)) {
306 mask &= ~GFS2_DIF_JDATA;
307 } else {
308 /* The GFS2_DIF_TOPDIR flag is only valid for directories. */
309 if (gfsflags & GFS2_DIF_TOPDIR)
310 return -EINVAL;
311 mask &= ~(GFS2_DIF_TOPDIR | GFS2_DIF_INHERIT_JDATA);
312 }
313
314 return do_gfs2_set_flags(filp, gfsflags, mask);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500315}
316
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400317static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500318{
319 switch(cmd) {
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400320 case FS_IOC_GETFLAGS:
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400321 return gfs2_get_flags(filp, (u32 __user *)arg);
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400322 case FS_IOC_SETFLAGS:
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400323 return gfs2_set_flags(filp, (u32 __user *)arg);
Steven Whitehouse66fc0612012-02-08 12:58:32 +0000324 case FITRIM:
325 return gfs2_fitrim(filp, (void __user *)arg);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500326 }
327 return -ENOTTY;
328}
329
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100330/**
Steven Whitehouseda1dfb62012-07-26 11:30:54 +0100331 * gfs2_size_hint - Give a hint to the size of a write request
Fabian Frederick9dd868e2014-05-15 18:57:08 +0200332 * @filep: The struct file
Steven Whitehouseda1dfb62012-07-26 11:30:54 +0100333 * @offset: The file offset of the write
334 * @size: The length of the write
335 *
336 * When we are about to do a write, this function records the total
337 * write size in order to provide a suitable hint to the lower layers
338 * about how many blocks will be required.
339 *
340 */
341
342static void gfs2_size_hint(struct file *filep, loff_t offset, size_t size)
343{
Al Viro496ad9a2013-01-23 17:07:38 -0500344 struct inode *inode = file_inode(filep);
Steven Whitehouseda1dfb62012-07-26 11:30:54 +0100345 struct gfs2_sbd *sdp = GFS2_SB(inode);
346 struct gfs2_inode *ip = GFS2_I(inode);
347 size_t blks = (size + sdp->sd_sb.sb_bsize - 1) >> sdp->sd_sb.sb_bsize_shift;
348 int hint = min_t(size_t, INT_MAX, blks);
349
Bob Petersona097dc7e2015-07-16 08:28:04 -0500350 if (hint > atomic_read(&ip->i_res.rs_sizehint))
351 atomic_set(&ip->i_res.rs_sizehint, hint);
Steven Whitehouseda1dfb62012-07-26 11:30:54 +0100352}
353
354/**
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100355 * gfs2_allocate_page_backing - Use bmap to allocate blocks
356 * @page: The (locked) page to allocate backing for
357 *
358 * We try to allocate all the blocks required for the page in
359 * one go. This might fail for various reasons, so we keep
360 * trying until all the blocks to back this page are allocated.
361 * If some of the blocks are already allocated, thats ok too.
362 */
363
364static int gfs2_allocate_page_backing(struct page *page)
365{
366 struct inode *inode = page->mapping->host;
367 struct buffer_head bh;
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300368 unsigned long size = PAGE_SIZE;
369 u64 lblock = page->index << (PAGE_SHIFT - inode->i_blkbits);
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100370
371 do {
372 bh.b_state = 0;
373 bh.b_size = size;
Bob Petersone9e1ef22007-12-10 14:13:27 -0600374 gfs2_block_map(inode, lblock, &bh, 1);
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100375 if (!buffer_mapped(&bh))
376 return -EIO;
377 size -= bh.b_size;
378 lblock += (bh.b_size >> inode->i_blkbits);
379 } while(size > 0);
380 return 0;
381}
382
383/**
384 * gfs2_page_mkwrite - Make a shared, mmap()ed, page writable
385 * @vma: The virtual memory area
Fabian Frederick9dd868e2014-05-15 18:57:08 +0200386 * @vmf: The virtual memory fault containing the page to become writable
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100387 *
388 * When the page becomes writable, we need to ensure that we have
389 * blocks allocated on disk to back that page.
390 */
391
Souptick Joarder109dbb12018-07-02 22:16:13 +0530392static vm_fault_t gfs2_page_mkwrite(struct vm_fault *vmf)
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100393{
Nick Pigginc2ec1752009-03-31 15:23:21 -0700394 struct page *page = vmf->page;
Dave Jiang11bac802017-02-24 14:56:41 -0800395 struct inode *inode = file_inode(vmf->vma->vm_file);
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100396 struct gfs2_inode *ip = GFS2_I(inode);
397 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehouse7b9cff42013-10-02 11:13:25 +0100398 struct gfs2_alloc_parms ap = { .aflags = 0, };
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100399 unsigned long last_index;
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300400 u64 pos = page->index << PAGE_SHIFT;
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100401 unsigned int data_blocks, ind_blocks, rblocks;
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100402 struct gfs2_holder gh;
Steven Whitehouse13d921e2011-09-07 15:12:51 +0100403 loff_t size;
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100404 int ret;
405
Jan Kara39263d5e2012-06-12 16:20:41 +0200406 sb_start_pagefault(inode->i_sb);
Steven Whitehouse13d921e2011-09-07 15:12:51 +0100407
Bob Petersonb54e9a02015-10-26 10:40:28 -0500408 ret = gfs2_rsqa_alloc(ip);
Bob Peterson0a305e42012-06-06 11:17:59 +0100409 if (ret)
Bob Petersona097dc7e2015-07-16 08:28:04 -0500410 goto out;
Bob Peterson0a305e42012-06-06 11:17:59 +0100411
Dave Jiang11bac802017-02-24 14:56:41 -0800412 gfs2_size_hint(vmf->vma->vm_file, pos, PAGE_SIZE);
Bob Peterson8e2e0042012-07-19 08:12:40 -0400413
Steven Whitehouse719ee342008-09-18 13:53:59 +0100414 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
415 ret = gfs2_glock_nq(&gh);
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100416 if (ret)
Bob Peterson2b3dcf32013-05-28 10:04:44 -0400417 goto out_uninit;
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100418
Andreas Gruenbacherd7c436c2016-09-26 13:20:19 -0500419 /* Update file times before taking page lock */
Dave Jiang11bac802017-02-24 14:56:41 -0800420 file_update_time(vmf->vma->vm_file);
Andreas Gruenbacherd7c436c2016-09-26 13:20:19 -0500421
Steven Whitehouse9c538832009-03-19 13:15:44 +0000422 set_bit(GLF_DIRTY, &ip->i_gl->gl_flags);
423 set_bit(GIF_SW_PAGED, &ip->i_flags);
424
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300425 if (!gfs2_write_alloc_required(ip, pos, PAGE_SIZE)) {
Steven Whitehouse13d921e2011-09-07 15:12:51 +0100426 lock_page(page);
427 if (!PageUptodate(page) || page->mapping != inode->i_mapping) {
428 ret = -EAGAIN;
429 unlock_page(page);
430 }
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100431 goto out_unlock;
Steven Whitehouse13d921e2011-09-07 15:12:51 +0100432 }
433
Bob Peterson5407e242012-05-18 09:28:23 -0400434 ret = gfs2_rindex_update(sdp);
435 if (ret)
Steven Whitehouse6dbd8222008-01-10 15:18:55 +0000436 goto out_unlock;
437
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300438 gfs2_write_calc_reserv(ip, PAGE_SIZE, &data_blocks, &ind_blocks);
Steven Whitehouse7b9cff42013-10-02 11:13:25 +0100439 ap.target = data_blocks + ind_blocks;
Abhi Dasb8fbf472015-03-18 12:03:41 -0500440 ret = gfs2_quota_lock_check(ip, &ap);
441 if (ret)
442 goto out_unlock;
Steven Whitehouse7b9cff42013-10-02 11:13:25 +0100443 ret = gfs2_inplace_reserve(ip, &ap);
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100444 if (ret)
445 goto out_quota_unlock;
446
447 rblocks = RES_DINODE + ind_blocks;
448 if (gfs2_is_jdata(ip))
449 rblocks += data_blocks ? data_blocks : 1;
Benjamin Marzinskibf97b672010-09-27 16:00:04 -0500450 if (ind_blocks || data_blocks) {
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100451 rblocks += RES_STATFS + RES_QUOTA;
Steven Whitehouse71f890f2012-07-30 14:53:19 +0100452 rblocks += gfs2_rg_blocks(ip, data_blocks + ind_blocks);
Benjamin Marzinskibf97b672010-09-27 16:00:04 -0500453 }
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100454 ret = gfs2_trans_begin(sdp, rblocks, 0);
455 if (ret)
456 goto out_trans_fail;
457
458 lock_page(page);
459 ret = -EINVAL;
Steven Whitehouse13d921e2011-09-07 15:12:51 +0100460 size = i_size_read(inode);
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +0300461 last_index = (size - 1) >> PAGE_SHIFT;
Steven Whitehouse13d921e2011-09-07 15:12:51 +0100462 /* Check page index against inode size */
463 if (size == 0 || (page->index > last_index))
464 goto out_trans_end;
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100465
Steven Whitehouse13d921e2011-09-07 15:12:51 +0100466 ret = -EAGAIN;
467 /* If truncated, we must retry the operation, we may have raced
468 * with the glock demotion code.
469 */
470 if (!PageUptodate(page) || page->mapping != inode->i_mapping)
471 goto out_trans_end;
472
473 /* Unstuff, if required, and allocate backing blocks for page */
474 ret = 0;
475 if (gfs2_is_stuffed(ip))
476 ret = gfs2_unstuff_dinode(ip, page);
477 if (ret == 0)
478 ret = gfs2_allocate_page_backing(page);
479
480out_trans_end:
481 if (ret)
482 unlock_page(page);
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100483 gfs2_trans_end(sdp);
484out_trans_fail:
485 gfs2_inplace_release(ip);
486out_quota_unlock:
487 gfs2_quota_unlock(ip);
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100488out_unlock:
489 gfs2_glock_dq(&gh);
Bob Peterson2b3dcf32013-05-28 10:04:44 -0400490out_uninit:
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100491 gfs2_holder_uninit(&gh);
Steven Whitehouse13d921e2011-09-07 15:12:51 +0100492 if (ret == 0) {
493 set_page_dirty(page);
Darrick J. Wong1d1d1a72013-02-21 16:42:51 -0800494 wait_for_stable_page(page);
Steven Whitehouse13d921e2011-09-07 15:12:51 +0100495 }
Bob Peterson2b3dcf32013-05-28 10:04:44 -0400496out:
Jan Kara39263d5e2012-06-12 16:20:41 +0200497 sb_end_pagefault(inode->i_sb);
Steven Whitehouse13d921e2011-09-07 15:12:51 +0100498 return block_page_mkwrite_return(ret);
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100499}
500
Alexey Dobriyanf0f37e2f2009-09-27 22:29:37 +0400501static const struct vm_operations_struct gfs2_vm_ops = {
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100502 .fault = filemap_fault,
Kirill A. Shutemovf1820362014-04-07 15:37:19 -0700503 .map_pages = filemap_map_pages,
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100504 .page_mkwrite = gfs2_page_mkwrite,
505};
506
David Teiglandb3b94fa2006-01-16 16:50:04 +0000507/**
508 * gfs2_mmap -
509 * @file: The file to map
510 * @vma: The VMA which described the mapping
511 *
Steven Whitehouse48bf2b12009-04-29 13:59:35 +0100512 * There is no need to get a lock here unless we should be updating
513 * atime. We ignore any locking errors since the only consequence is
514 * a missed atime update (which will just be deferred until later).
515 *
516 * Returns: 0
David Teiglandb3b94fa2006-01-16 16:50:04 +0000517 */
518
519static int gfs2_mmap(struct file *file, struct vm_area_struct *vma)
520{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400521 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000522
Steven Whitehouseb9c93bb2011-02-02 14:48:10 +0000523 if (!(file->f_flags & O_NOATIME) &&
524 !IS_NOATIME(&ip->i_inode)) {
Steven Whitehouse48bf2b12009-04-29 13:59:35 +0100525 struct gfs2_holder i_gh;
526 int error;
527
Benjamin Marzinski3d162682012-11-06 00:49:28 -0600528 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
529 &i_gh);
Steven Whitehouseb9c93bb2011-02-02 14:48:10 +0000530 if (error)
531 return error;
Benjamin Marzinski3d162682012-11-06 00:49:28 -0600532 /* grab lock to update inode */
533 gfs2_glock_dq_uninit(&i_gh);
534 file_accessed(file);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000535 }
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100536 vma->vm_ops = &gfs2_vm_ops;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000537
Steven Whitehouse48bf2b12009-04-29 13:59:35 +0100538 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000539}
540
541/**
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100542 * gfs2_open_common - This is common to open and atomic_open
543 * @inode: The inode being opened
544 * @file: The file being opened
545 *
546 * This maybe called under a glock or not depending upon how it has
547 * been called. We must always be called under a glock for regular
548 * files, however. For other file types, it does not matter whether
549 * we hold the glock or not.
550 *
551 * Returns: Error code or 0 for success
552 */
553
554int gfs2_open_common(struct inode *inode, struct file *file)
555{
556 struct gfs2_file *fp;
557 int ret;
558
559 if (S_ISREG(inode->i_mode)) {
560 ret = generic_file_open(inode, file);
561 if (ret)
562 return ret;
563 }
564
565 fp = kzalloc(sizeof(struct gfs2_file), GFP_NOFS);
566 if (!fp)
567 return -ENOMEM;
568
569 mutex_init(&fp->f_fl_mutex);
570
571 gfs2_assert_warn(GFS2_SB(inode), !file->private_data);
572 file->private_data = fp;
573 return 0;
574}
575
576/**
David Teiglandb3b94fa2006-01-16 16:50:04 +0000577 * gfs2_open - open a file
578 * @inode: the inode to open
579 * @file: the struct file for this opening
580 *
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100581 * After atomic_open, this function is only used for opening files
582 * which are already cached. We must still get the glock for regular
583 * files to ensure that we have the file size uptodate for the large
584 * file check which is in the common code. That is only an issue for
585 * regular files though.
586 *
David Teiglandb3b94fa2006-01-16 16:50:04 +0000587 * Returns: errno
588 */
589
590static int gfs2_open(struct inode *inode, struct file *file)
591{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400592 struct gfs2_inode *ip = GFS2_I(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000593 struct gfs2_holder i_gh;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000594 int error;
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100595 bool need_unlock = false;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000596
Steven Whitehouseb60623c2006-11-01 12:22:46 -0500597 if (S_ISREG(ip->i_inode.i_mode)) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000598 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
599 &i_gh);
600 if (error)
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100601 return error;
602 need_unlock = true;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000603 }
604
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100605 error = gfs2_open_common(inode, file);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000606
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100607 if (need_unlock)
608 gfs2_glock_dq_uninit(&i_gh);
609
David Teiglandb3b94fa2006-01-16 16:50:04 +0000610 return error;
611}
612
613/**
Bob Petersondf3fd112012-04-11 12:56:41 -0400614 * gfs2_release - called to close a struct file
David Teiglandb3b94fa2006-01-16 16:50:04 +0000615 * @inode: the inode the struct file belongs to
616 * @file: the struct file being closed
617 *
618 * Returns: errno
619 */
620
Bob Petersondf3fd112012-04-11 12:56:41 -0400621static int gfs2_release(struct inode *inode, struct file *file)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000622{
Bob Peterson0a305e42012-06-06 11:17:59 +0100623 struct gfs2_inode *ip = GFS2_I(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000624
Bob Peterson8e2e0042012-07-19 08:12:40 -0400625 kfree(file->private_data);
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500626 file->private_data = NULL;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000627
Bob Peterson2b3dcf32013-05-28 10:04:44 -0400628 if (!(file->f_mode & FMODE_WRITE))
629 return 0;
Bob Peterson0a305e42012-06-06 11:17:59 +0100630
Bob Petersonb54e9a02015-10-26 10:40:28 -0500631 gfs2_rsqa_delete(ip, &inode->i_writecount);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000632 return 0;
633}
634
635/**
636 * gfs2_fsync - sync the dirty data for a file (across the cluster)
Josef Bacik02c24a82011-07-16 20:44:56 -0400637 * @file: the file that points to the dentry
638 * @start: the start position in the file to sync
639 * @end: the end position in the file to sync
Steven Whitehousedba898b2011-04-14 09:54:02 +0100640 * @datasync: set if we can ignore timestamp changes
David Teiglandb3b94fa2006-01-16 16:50:04 +0000641 *
Steven Whitehouse2f0264d2011-07-27 10:58:48 +0100642 * We split the data flushing here so that we don't wait for the data
643 * until after we've also sent the metadata to disk. Note that for
644 * data=ordered, we will write & wait for the data at the log flush
645 * stage anyway, so this is unlikely to make much of a difference
646 * except in the data=writeback case.
647 *
648 * If the fdatawrite fails due to any reason except -EIO, we will
649 * continue the remainder of the fsync, although we'll still report
650 * the error at the end. This is to match filemap_write_and_wait_range()
651 * behaviour.
Steven Whitehouse34126f92006-12-07 09:13:14 -0500652 *
David Teiglandb3b94fa2006-01-16 16:50:04 +0000653 * Returns: errno
654 */
655
Josef Bacik02c24a82011-07-16 20:44:56 -0400656static int gfs2_fsync(struct file *file, loff_t start, loff_t end,
657 int datasync)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000658{
Steven Whitehouse2f0264d2011-07-27 10:58:48 +0100659 struct address_space *mapping = file->f_mapping;
660 struct inode *inode = mapping->host;
Theodore Ts'o0ae45f62015-02-02 00:37:00 -0500661 int sync_state = inode->i_state & I_DIRTY_ALL;
Steven Whitehousedba898b2011-04-14 09:54:02 +0100662 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehouse87654892011-11-08 14:04:20 +0000663 int ret = 0, ret1 = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000664
Steven Whitehouse2f0264d2011-07-27 10:58:48 +0100665 if (mapping->nrpages) {
666 ret1 = filemap_fdatawrite_range(mapping, start, end);
667 if (ret1 == -EIO)
668 return ret1;
669 }
Josef Bacik02c24a82011-07-16 20:44:56 -0400670
Benjamin Marzinski0c901802013-09-03 16:59:42 -0500671 if (!gfs2_is_jdata(ip))
672 sync_state &= ~I_DIRTY_PAGES;
Steven Whitehousedba898b2011-04-14 09:54:02 +0100673 if (datasync)
Theodore Ts'o0ae45f62015-02-02 00:37:00 -0500674 sync_state &= ~(I_DIRTY_SYNC | I_DIRTY_TIME);
Steven Whitehousedba898b2011-04-14 09:54:02 +0100675
676 if (sync_state) {
677 ret = sync_inode_metadata(inode, 1);
Steven Whitehouseb5b24d72011-09-07 10:33:25 +0100678 if (ret)
Steven Whitehousedba898b2011-04-14 09:54:02 +0100679 return ret;
Steven Whitehousef1818522011-08-05 10:12:47 +0100680 if (gfs2_is_jdata(ip))
Jeff Laytond07a6ac2017-07-07 15:20:53 -0400681 ret = file_write_and_wait(file);
682 if (ret)
683 return ret;
Steven Whitehouseb5b24d72011-09-07 10:33:25 +0100684 gfs2_ail_flush(ip->i_gl, 1);
Steven Whitehouse33c3de32006-11-30 10:14:32 -0500685 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000686
Steven Whitehouse2f0264d2011-07-27 10:58:48 +0100687 if (mapping->nrpages)
Jeff Laytond07a6ac2017-07-07 15:20:53 -0400688 ret = file_fdatawait_range(file, start, end);
Steven Whitehouse2f0264d2011-07-27 10:58:48 +0100689
690 return ret ? ret : ret1;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000691}
692
Andreas Gruenbacher967bcc92018-06-19 15:08:02 +0100693static ssize_t gfs2_file_direct_read(struct kiocb *iocb, struct iov_iter *to)
694{
695 struct file *file = iocb->ki_filp;
696 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
697 size_t count = iov_iter_count(to);
698 struct gfs2_holder gh;
699 ssize_t ret;
700
701 if (!count)
702 return 0; /* skip atime */
703
704 gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, &gh);
705 ret = gfs2_glock_nq(&gh);
706 if (ret)
707 goto out_uninit;
708
Andreas Gruenbacher967bcc92018-06-19 15:08:02 +0100709 ret = iomap_dio_rw(iocb, to, &gfs2_iomap_ops, NULL);
710
Andreas Gruenbacher967bcc92018-06-19 15:08:02 +0100711 gfs2_glock_dq(&gh);
712out_uninit:
713 gfs2_holder_uninit(&gh);
714 return ret;
715}
716
717static ssize_t gfs2_file_direct_write(struct kiocb *iocb, struct iov_iter *from)
718{
719 struct file *file = iocb->ki_filp;
720 struct inode *inode = file->f_mapping->host;
721 struct gfs2_inode *ip = GFS2_I(inode);
722 size_t len = iov_iter_count(from);
723 loff_t offset = iocb->ki_pos;
724 struct gfs2_holder gh;
725 ssize_t ret;
726
727 /*
728 * Deferred lock, even if its a write, since we do no allocation on
729 * this path. All we need to change is the atime, and this lock mode
730 * ensures that other nodes have flushed their buffered read caches
731 * (i.e. their page cache entries for this inode). We do not,
732 * unfortunately, have the option of only flushing a range like the
733 * VFS does.
734 */
735 gfs2_holder_init(ip->i_gl, LM_ST_DEFERRED, 0, &gh);
736 ret = gfs2_glock_nq(&gh);
737 if (ret)
738 goto out_uninit;
739
740 /* Silently fall back to buffered I/O when writing beyond EOF */
741 if (offset + len > i_size_read(&ip->i_inode))
742 goto out;
743
744 ret = iomap_dio_rw(iocb, from, &gfs2_iomap_ops, NULL);
745
746out:
747 gfs2_glock_dq(&gh);
748out_uninit:
749 gfs2_holder_uninit(&gh);
750 return ret;
751}
752
753static ssize_t gfs2_file_read_iter(struct kiocb *iocb, struct iov_iter *to)
754{
755 ssize_t ret;
756
757 if (iocb->ki_flags & IOCB_DIRECT) {
758 ret = gfs2_file_direct_read(iocb, to);
759 if (likely(ret != -ENOTBLK))
760 return ret;
761 iocb->ki_flags &= ~IOCB_DIRECT;
762 }
763 return generic_file_read_iter(iocb, to);
764}
765
Steven Whitehouse56aa6162009-12-08 10:25:33 +0000766/**
Al Viroda56e452014-04-03 14:11:01 -0400767 * gfs2_file_write_iter - Perform a write to a file
Steven Whitehouse56aa6162009-12-08 10:25:33 +0000768 * @iocb: The io context
Andreas Gruenbacher64bc06b2018-06-24 15:04:04 +0100769 * @from: The data to write
Steven Whitehouse56aa6162009-12-08 10:25:33 +0000770 *
771 * We have to do a lock/unlock here to refresh the inode size for
772 * O_APPEND writes, otherwise we can land up writing at the wrong
773 * offset. There is still a race, but provided the app is using its
774 * own file locking, this will make O_APPEND work as expected.
775 *
776 */
777
Al Viroda56e452014-04-03 14:11:01 -0400778static ssize_t gfs2_file_write_iter(struct kiocb *iocb, struct iov_iter *from)
Steven Whitehouse56aa6162009-12-08 10:25:33 +0000779{
780 struct file *file = iocb->ki_filp;
Andreas Gruenbacher64bc06b2018-06-24 15:04:04 +0100781 struct inode *inode = file_inode(file);
782 struct gfs2_inode *ip = GFS2_I(inode);
Andreas Gruenbacher967bcc92018-06-19 15:08:02 +0100783 ssize_t written = 0, ret;
Bob Peterson0a305e42012-06-06 11:17:59 +0100784
Bob Petersonb54e9a02015-10-26 10:40:28 -0500785 ret = gfs2_rsqa_alloc(ip);
Bob Peterson0a305e42012-06-06 11:17:59 +0100786 if (ret)
787 return ret;
Steven Whitehouse56aa6162009-12-08 10:25:33 +0000788
Al Viroda56e452014-04-03 14:11:01 -0400789 gfs2_size_hint(file, iocb->ki_pos, iov_iter_count(from));
Steven Whitehouseda1dfb62012-07-26 11:30:54 +0100790
Al Viro2ba48ce2015-04-09 13:52:01 -0400791 if (iocb->ki_flags & IOCB_APPEND) {
Steven Whitehouse56aa6162009-12-08 10:25:33 +0000792 struct gfs2_holder gh;
Steven Whitehouse56aa6162009-12-08 10:25:33 +0000793
794 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
795 if (ret)
796 return ret;
797 gfs2_glock_dq_uninit(&gh);
798 }
799
Andreas Gruenbacher64bc06b2018-06-24 15:04:04 +0100800 inode_lock(inode);
801 ret = generic_write_checks(iocb, from);
802 if (ret <= 0)
803 goto out;
804
805 /* We can write back this queue in page reclaim */
806 current->backing_dev_info = inode_to_bdi(inode);
807
808 ret = file_remove_privs(file);
809 if (ret)
810 goto out2;
811
812 ret = file_update_time(file);
813 if (ret)
814 goto out2;
815
Andreas Gruenbacher967bcc92018-06-19 15:08:02 +0100816 if (iocb->ki_flags & IOCB_DIRECT) {
817 struct address_space *mapping = file->f_mapping;
818 loff_t pos, endbyte;
819 ssize_t buffered;
820
821 written = gfs2_file_direct_write(iocb, from);
822 if (written < 0 || !iov_iter_count(from))
823 goto out2;
824
825 ret = iomap_file_buffered_write(iocb, from, &gfs2_iomap_ops);
826 if (unlikely(ret < 0))
827 goto out2;
828 buffered = ret;
829
830 /*
831 * We need to ensure that the page cache pages are written to
832 * disk and invalidated to preserve the expected O_DIRECT
833 * semantics.
834 */
835 pos = iocb->ki_pos;
836 endbyte = pos + buffered - 1;
837 ret = filemap_write_and_wait_range(mapping, pos, endbyte);
838 if (!ret) {
839 iocb->ki_pos += buffered;
840 written += buffered;
841 invalidate_mapping_pages(mapping,
842 pos >> PAGE_SHIFT,
843 endbyte >> PAGE_SHIFT);
844 } else {
845 /*
846 * We don't know how much we wrote, so just return
847 * the number of bytes which were direct-written
848 */
849 }
850 } else {
851 ret = iomap_file_buffered_write(iocb, from, &gfs2_iomap_ops);
852 if (likely(ret > 0))
853 iocb->ki_pos += ret;
854 }
Andreas Gruenbacher64bc06b2018-06-24 15:04:04 +0100855
856out2:
857 current->backing_dev_info = NULL;
858out:
859 inode_unlock(inode);
860 if (likely(ret > 0)) {
Andreas Gruenbacher64bc06b2018-06-24 15:04:04 +0100861 /* Handle various SYNC-type writes */
862 ret = generic_write_sync(iocb, ret);
863 }
Andreas Gruenbacher967bcc92018-06-19 15:08:02 +0100864 return written ? written : ret;
Steven Whitehouse56aa6162009-12-08 10:25:33 +0000865}
866
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100867static int fallocate_chunk(struct inode *inode, loff_t offset, loff_t len,
868 int mode)
869{
Andreas Gruenbacherfffb6412018-03-29 06:50:32 -0700870 struct super_block *sb = inode->i_sb;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100871 struct gfs2_inode *ip = GFS2_I(inode);
Andreas Gruenbacherfffb6412018-03-29 06:50:32 -0700872 loff_t end = offset + len;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100873 struct buffer_head *dibh;
874 int error;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100875
876 error = gfs2_meta_inode_buffer(ip, &dibh);
877 if (unlikely(error))
Benjamin Marzinski64dd1532011-09-12 18:15:24 -0500878 return error;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100879
Steven Whitehouse350a9b02012-12-14 12:36:02 +0000880 gfs2_trans_add_meta(ip->i_gl, dibh);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100881
882 if (gfs2_is_stuffed(ip)) {
883 error = gfs2_unstuff_dinode(ip, NULL);
884 if (unlikely(error))
885 goto out;
886 }
887
Andreas Gruenbacherfffb6412018-03-29 06:50:32 -0700888 while (offset < end) {
Andreas Gruenbacherc25892822018-07-06 23:05:41 +0100889 struct iomap iomap = { };
890
Andreas Gruenbacher628e3662018-06-04 07:56:51 -0500891 error = gfs2_iomap_get_alloc(inode, offset, end - offset,
892 &iomap);
Andreas Gruenbacherfffb6412018-03-29 06:50:32 -0700893 if (error)
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100894 goto out;
Andreas Gruenbacherfffb6412018-03-29 06:50:32 -0700895 offset = iomap.offset + iomap.length;
Andreas Gruenbacherd505a96a2018-06-24 10:43:49 +0100896 if (!(iomap.flags & IOMAP_F_NEW))
Benjamin Marzinski64dd1532011-09-12 18:15:24 -0500897 continue;
Andreas Gruenbacherfffb6412018-03-29 06:50:32 -0700898 error = sb_issue_zeroout(sb, iomap.addr >> inode->i_blkbits,
899 iomap.length >> inode->i_blkbits,
900 GFP_NOFS);
901 if (error) {
902 fs_err(GFS2_SB(inode), "Failed to zero data buffers\n");
Benjamin Marzinski64dd1532011-09-12 18:15:24 -0500903 goto out;
904 }
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100905 }
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100906out:
Benjamin Marzinski64dd1532011-09-12 18:15:24 -0500907 brelse(dibh);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100908 return error;
909}
Abhi Dasd9be0cd2015-03-18 12:05:15 -0500910/**
911 * calc_max_reserv() - Reverse of write_calc_reserv. Given a number of
912 * blocks, determine how many bytes can be written.
913 * @ip: The inode in question.
914 * @len: Max cap of bytes. What we return in *len must be <= this.
915 * @data_blocks: Compute and return the number of data blocks needed
916 * @ind_blocks: Compute and return the number of indirect blocks needed
917 * @max_blocks: The total blocks available to work with.
918 *
919 * Returns: void, but @len, @data_blocks and @ind_blocks are filled in.
920 */
921static void calc_max_reserv(struct gfs2_inode *ip, loff_t *len,
922 unsigned int *data_blocks, unsigned int *ind_blocks,
923 unsigned int max_blocks)
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100924{
Abhi Dasd9be0cd2015-03-18 12:05:15 -0500925 loff_t max = *len;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100926 const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100927 unsigned int tmp, max_data = max_blocks - 3 * (sdp->sd_max_height - 1);
928
929 for (tmp = max_data; tmp > sdp->sd_diptrs;) {
930 tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs);
931 max_data -= tmp;
932 }
Abhi Dasd9be0cd2015-03-18 12:05:15 -0500933
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100934 *data_blocks = max_data;
935 *ind_blocks = max_blocks - max_data;
936 *len = ((loff_t)max_data - 3) << sdp->sd_sb.sb_bsize_shift;
937 if (*len > max) {
938 *len = max;
939 gfs2_write_calc_reserv(ip, max, data_blocks, ind_blocks);
940 }
941}
942
Andrew Price9c9f1152014-11-12 17:24:03 +0000943static long __gfs2_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100944{
Al Viro496ad9a2013-01-23 17:07:38 -0500945 struct inode *inode = file_inode(file);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100946 struct gfs2_sbd *sdp = GFS2_SB(inode);
947 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehouse7b9cff42013-10-02 11:13:25 +0100948 struct gfs2_alloc_parms ap = { .aflags = 0, };
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100949 unsigned int data_blocks = 0, ind_blocks = 0, rblocks;
Andreas Gruenbacher174d1232018-02-20 08:03:24 -0700950 loff_t bytes, max_bytes, max_blks;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100951 int error;
Steven Whitehouse4442f2e2011-11-21 10:01:25 +0000952 const loff_t pos = offset;
953 const loff_t count = len;
Benjamin Marzinski6905d9e2011-04-26 01:13:24 -0500954 loff_t bsize_mask = ~((loff_t)sdp->sd_sb.sb_bsize - 1);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100955 loff_t next = (offset + len - 1) >> sdp->sd_sb.sb_bsize_shift;
Benjamin Marzinski64dd1532011-09-12 18:15:24 -0500956 loff_t max_chunk_size = UINT_MAX & bsize_mask;
Bob Petersona0846a52014-02-06 10:43:50 -0500957
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100958 next = (next + 1) << sdp->sd_sb.sb_bsize_shift;
959
Benjamin Marzinski6905d9e2011-04-26 01:13:24 -0500960 offset &= bsize_mask;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100961
962 len = next - offset;
963 bytes = sdp->sd_max_rg_data * sdp->sd_sb.sb_bsize / 2;
964 if (!bytes)
965 bytes = UINT_MAX;
Benjamin Marzinski6905d9e2011-04-26 01:13:24 -0500966 bytes &= bsize_mask;
967 if (bytes == 0)
968 bytes = sdp->sd_sb.sb_bsize;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100969
Steven Whitehouseda1dfb62012-07-26 11:30:54 +0100970 gfs2_size_hint(file, offset, len);
Bob Peterson8e2e0042012-07-19 08:12:40 -0400971
Abhi Dasd9be0cd2015-03-18 12:05:15 -0500972 gfs2_write_calc_reserv(ip, PAGE_SIZE, &data_blocks, &ind_blocks);
973 ap.min_target = data_blocks + ind_blocks;
974
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100975 while (len > 0) {
976 if (len < bytes)
977 bytes = len;
Benjamin Marzinski58a7d5f2012-03-08 13:16:32 -0600978 if (!gfs2_write_alloc_required(ip, offset, bytes)) {
979 len -= bytes;
980 offset += bytes;
981 continue;
982 }
Abhi Dasd9be0cd2015-03-18 12:05:15 -0500983
984 /* We need to determine how many bytes we can actually
985 * fallocate without exceeding quota or going over the
986 * end of the fs. We start off optimistically by assuming
987 * we can write max_bytes */
988 max_bytes = (len > max_chunk_size) ? max_chunk_size : len;
989
990 /* Since max_bytes is most likely a theoretical max, we
991 * calculate a more realistic 'bytes' to serve as a good
992 * starting point for the number of bytes we may be able
993 * to write */
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100994 gfs2_write_calc_reserv(ip, bytes, &data_blocks, &ind_blocks);
Steven Whitehouse7b9cff42013-10-02 11:13:25 +0100995 ap.target = data_blocks + ind_blocks;
Abhi Dasb8fbf472015-03-18 12:03:41 -0500996
997 error = gfs2_quota_lock_check(ip, &ap);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100998 if (error)
999 return error;
Abhi Dasd9be0cd2015-03-18 12:05:15 -05001000 /* ap.allowed tells us how many blocks quota will allow
1001 * us to write. Check if this reduces max_blks */
Andreas Gruenbacher174d1232018-02-20 08:03:24 -07001002 max_blks = UINT_MAX;
1003 if (ap.allowed)
Abhi Dasd9be0cd2015-03-18 12:05:15 -05001004 max_blks = ap.allowed;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01001005
Steven Whitehouse7b9cff42013-10-02 11:13:25 +01001006 error = gfs2_inplace_reserve(ip, &ap);
Abhi Dasd9be0cd2015-03-18 12:05:15 -05001007 if (error)
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01001008 goto out_qunlock;
Abhi Dasd9be0cd2015-03-18 12:05:15 -05001009
1010 /* check if the selected rgrp limits our max_blks further */
1011 if (ap.allowed && ap.allowed < max_blks)
1012 max_blks = ap.allowed;
1013
1014 /* Almost done. Calculate bytes that can be written using
1015 * max_blks. We also recompute max_bytes, data_blocks and
1016 * ind_blocks */
1017 calc_max_reserv(ip, &max_bytes, &data_blocks,
1018 &ind_blocks, max_blks);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01001019
1020 rblocks = RES_DINODE + ind_blocks + RES_STATFS + RES_QUOTA +
Steven Whitehouse71f890f2012-07-30 14:53:19 +01001021 RES_RG_HDR + gfs2_rg_blocks(ip, data_blocks + ind_blocks);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01001022 if (gfs2_is_jdata(ip))
1023 rblocks += data_blocks ? data_blocks : 1;
1024
1025 error = gfs2_trans_begin(sdp, rblocks,
Kirill A. Shutemov09cbfea2016-04-01 15:29:47 +03001026 PAGE_SIZE/sdp->sd_sb.sb_bsize);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01001027 if (error)
1028 goto out_trans_fail;
1029
1030 error = fallocate_chunk(inode, offset, max_bytes, mode);
1031 gfs2_trans_end(sdp);
1032
1033 if (error)
1034 goto out_trans_fail;
1035
1036 len -= max_bytes;
1037 offset += max_bytes;
1038 gfs2_inplace_release(ip);
1039 gfs2_quota_unlock(ip);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01001040 }
Steven Whitehouse4442f2e2011-11-21 10:01:25 +00001041
Andrew Price18858672014-11-12 17:24:04 +00001042 if (!(mode & FALLOC_FL_KEEP_SIZE) && (pos + count) > inode->i_size) {
1043 i_size_write(inode, pos + count);
Andrew Price98f1a692014-11-12 17:24:05 +00001044 file_update_time(file);
Andrew Price4b813f02015-09-22 07:41:21 -05001045 mark_inode_dirty(inode);
Andrew Price18858672014-11-12 17:24:04 +00001046 }
1047
Christoph Hellwigdde0c2e2016-04-07 08:52:00 -07001048 if ((file->f_flags & O_DSYNC) || IS_SYNC(file->f_mapping->host))
1049 return vfs_fsync_range(file, pos, pos + count - 1,
1050 (file->f_flags & __O_SYNC) ? 0 : 1);
1051 return 0;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01001052
1053out_trans_fail:
1054 gfs2_inplace_release(ip);
1055out_qunlock:
1056 gfs2_quota_unlock(ip);
Andrew Price9c9f1152014-11-12 17:24:03 +00001057 return error;
1058}
1059
1060static long gfs2_fallocate(struct file *file, int mode, loff_t offset, loff_t len)
1061{
1062 struct inode *inode = file_inode(file);
Andrew Priced4d7fc12017-04-05 11:45:26 -04001063 struct gfs2_sbd *sdp = GFS2_SB(inode);
Andrew Price9c9f1152014-11-12 17:24:03 +00001064 struct gfs2_inode *ip = GFS2_I(inode);
1065 struct gfs2_holder gh;
1066 int ret;
1067
Andreas Gruenbacher4e56a642017-12-14 17:11:03 +01001068 if (mode & ~(FALLOC_FL_PUNCH_HOLE | FALLOC_FL_KEEP_SIZE))
Andrew Priced4d7fc12017-04-05 11:45:26 -04001069 return -EOPNOTSUPP;
1070 /* fallocate is needed by gfs2_grow to reserve space in the rindex */
1071 if (gfs2_is_jdata(ip) && inode != sdp->sd_rindex)
Andrew Price9c9f1152014-11-12 17:24:03 +00001072 return -EOPNOTSUPP;
1073
Al Viro59551022016-01-22 15:40:57 -05001074 inode_lock(inode);
Andrew Price9c9f1152014-11-12 17:24:03 +00001075
1076 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
1077 ret = gfs2_glock_nq(&gh);
1078 if (ret)
1079 goto out_uninit;
1080
1081 if (!(mode & FALLOC_FL_KEEP_SIZE) &&
1082 (offset + len) > inode->i_size) {
1083 ret = inode_newsize_ok(inode, offset + len);
1084 if (ret)
1085 goto out_unlock;
1086 }
1087
1088 ret = get_write_access(inode);
1089 if (ret)
1090 goto out_unlock;
1091
Andreas Gruenbacher4e56a642017-12-14 17:11:03 +01001092 if (mode & FALLOC_FL_PUNCH_HOLE) {
1093 ret = __gfs2_punch_hole(file, offset, len);
1094 } else {
1095 ret = gfs2_rsqa_alloc(ip);
1096 if (ret)
1097 goto out_putw;
Andrew Price9c9f1152014-11-12 17:24:03 +00001098
Andreas Gruenbacher4e56a642017-12-14 17:11:03 +01001099 ret = __gfs2_fallocate(file, mode, offset, len);
1100
1101 if (ret)
1102 gfs2_rs_deltree(&ip->i_res);
1103 }
Bob Petersona097dc7e2015-07-16 08:28:04 -05001104
Andrew Price9c9f1152014-11-12 17:24:03 +00001105out_putw:
1106 put_write_access(inode);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01001107out_unlock:
Bob Petersona0846a52014-02-06 10:43:50 -05001108 gfs2_glock_dq(&gh);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01001109out_uninit:
Bob Petersona0846a52014-02-06 10:43:50 -05001110 gfs2_holder_uninit(&gh);
Al Viro59551022016-01-22 15:40:57 -05001111 inode_unlock(inode);
Andrew Price9c9f1152014-11-12 17:24:03 +00001112 return ret;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01001113}
1114
Bob Petersonf1ea6f42015-02-24 07:22:28 -06001115static ssize_t gfs2_file_splice_write(struct pipe_inode_info *pipe,
1116 struct file *out, loff_t *ppos,
1117 size_t len, unsigned int flags)
1118{
1119 int error;
1120 struct gfs2_inode *ip = GFS2_I(out->f_mapping->host);
1121
Bob Petersonb54e9a02015-10-26 10:40:28 -05001122 error = gfs2_rsqa_alloc(ip);
Bob Petersonf1ea6f42015-02-24 07:22:28 -06001123 if (error)
1124 return (ssize_t)error;
1125
1126 gfs2_size_hint(out, *ppos, len);
1127
1128 return iter_file_splice_write(pipe, out, ppos, len, flags);
1129}
1130
Steven Whitehousef057f6c2009-01-12 10:43:39 +00001131#ifdef CONFIG_GFS2_FS_LOCKING_DLM
1132
David Teiglandb3b94fa2006-01-16 16:50:04 +00001133/**
1134 * gfs2_lock - acquire/release a posix lock on a file
1135 * @file: the file pointer
1136 * @cmd: either modify or retrieve lock state, possibly wait
1137 * @fl: type and range of lock
1138 *
1139 * Returns: errno
1140 */
1141
1142static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl)
1143{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001144 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
1145 struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
Steven Whitehousef057f6c2009-01-12 10:43:39 +00001146 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001147
David Teiglandb3b94fa2006-01-16 16:50:04 +00001148 if (!(fl->fl_flags & FL_POSIX))
1149 return -ENOLCK;
Sachin Prabhu720e7742010-03-11 12:24:45 -05001150 if (__mandatory_lock(&ip->i_inode) && fl->fl_type != F_UNLCK)
David Teiglandb3b94fa2006-01-16 16:50:04 +00001151 return -ENOLCK;
1152
Marc Eshel586759f2006-11-14 16:37:25 -05001153 if (cmd == F_CANCELLK) {
1154 /* Hack: */
1155 cmd = F_SETLK;
1156 fl->fl_type = F_UNLCK;
1157 }
Steven Whitehousec2952d22013-03-14 15:49:59 +00001158 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) {
1159 if (fl->fl_type == F_UNLCK)
Benjamin Coddington4f656362015-10-22 13:38:14 -04001160 locks_lock_file_wait(file, fl);
Steven Whitehousef057f6c2009-01-12 10:43:39 +00001161 return -EIO;
Steven Whitehousec2952d22013-03-14 15:49:59 +00001162 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001163 if (IS_GETLK(cmd))
Steven Whitehousef057f6c2009-01-12 10:43:39 +00001164 return dlm_posix_get(ls->ls_dlm, ip->i_no_addr, file, fl);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001165 else if (fl->fl_type == F_UNLCK)
Steven Whitehousef057f6c2009-01-12 10:43:39 +00001166 return dlm_posix_unlock(ls->ls_dlm, ip->i_no_addr, file, fl);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001167 else
Steven Whitehousef057f6c2009-01-12 10:43:39 +00001168 return dlm_posix_lock(ls->ls_dlm, ip->i_no_addr, file, cmd, fl);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001169}
1170
David Teiglandb3b94fa2006-01-16 16:50:04 +00001171static int do_flock(struct file *file, int cmd, struct file_lock *fl)
1172{
Steven Whitehouse5c676f62006-02-27 17:23:27 -05001173 struct gfs2_file *fp = file->private_data;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001174 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
Al Viro496ad9a2013-01-23 17:07:38 -05001175 struct gfs2_inode *ip = GFS2_I(file_inode(file));
David Teiglandb3b94fa2006-01-16 16:50:04 +00001176 struct gfs2_glock *gl;
1177 unsigned int state;
Bob Petersonb58bf402015-07-24 09:45:43 -05001178 u16 flags;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001179 int error = 0;
Bob Peterson2ddfbdd2014-08-20 12:44:45 -04001180 int sleeptime;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001181
1182 state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED;
Bob Peterson2ddfbdd2014-08-20 12:44:45 -04001183 flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY_1CB) | GL_EXACT;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001184
Steven Whitehousef55ab262006-02-21 12:51:39 +00001185 mutex_lock(&fp->f_fl_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001186
Andreas Gruenbacher283c9a92017-07-17 13:39:15 -05001187 if (gfs2_holder_initialized(fl_gh)) {
David Teiglandb3b94fa2006-01-16 16:50:04 +00001188 if (fl_gh->gh_state == state)
1189 goto out;
Benjamin Coddington4f656362015-10-22 13:38:14 -04001190 locks_lock_file_wait(file,
Junxiao Bia93a99832015-12-22 08:06:08 -06001191 &(struct file_lock) {
1192 .fl_type = F_UNLCK,
1193 .fl_flags = FL_FLOCK
1194 });
Bob Peterson5bef3e72014-06-26 10:46:25 -04001195 gfs2_glock_dq(fl_gh);
Abhijith Dasb4c20162007-09-13 23:35:27 -05001196 gfs2_holder_reinit(state, flags, fl_gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001197 } else {
Steven Whitehouse6802e342008-05-21 17:03:22 +01001198 error = gfs2_glock_get(GFS2_SB(&ip->i_inode), ip->i_no_addr,
1199 &gfs2_flock_glops, CREATE, &gl);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001200 if (error)
1201 goto out;
Abhijith Dasb4c20162007-09-13 23:35:27 -05001202 gfs2_holder_init(gl, state, flags, fl_gh);
1203 gfs2_glock_put(gl);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001204 }
Bob Peterson2ddfbdd2014-08-20 12:44:45 -04001205 for (sleeptime = 1; sleeptime <= 4; sleeptime <<= 1) {
1206 error = gfs2_glock_nq(fl_gh);
1207 if (error != GLR_TRYFAILED)
1208 break;
1209 fl_gh->gh_flags = LM_FLAG_TRY | GL_EXACT;
1210 fl_gh->gh_error = 0;
1211 msleep(sleeptime);
1212 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001213 if (error) {
1214 gfs2_holder_uninit(fl_gh);
1215 if (error == GLR_TRYFAILED)
1216 error = -EAGAIN;
1217 } else {
Benjamin Coddington4f656362015-10-22 13:38:14 -04001218 error = locks_lock_file_wait(file, fl);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001219 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001220 }
1221
Steven Whitehouse420b9e52006-07-31 15:42:17 -04001222out:
Steven Whitehousef55ab262006-02-21 12:51:39 +00001223 mutex_unlock(&fp->f_fl_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001224 return error;
1225}
1226
1227static void do_unflock(struct file *file, struct file_lock *fl)
1228{
Steven Whitehouse5c676f62006-02-27 17:23:27 -05001229 struct gfs2_file *fp = file->private_data;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001230 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
1231
Steven Whitehousef55ab262006-02-21 12:51:39 +00001232 mutex_lock(&fp->f_fl_mutex);
Benjamin Coddington4f656362015-10-22 13:38:14 -04001233 locks_lock_file_wait(file, fl);
Andreas Gruenbacher6df9f9a2016-06-17 07:31:27 -05001234 if (gfs2_holder_initialized(fl_gh)) {
Bob Peterson2ddfbdd2014-08-20 12:44:45 -04001235 gfs2_glock_dq(fl_gh);
Steven Whitehouse0a334432011-03-09 11:14:32 +00001236 gfs2_holder_uninit(fl_gh);
1237 }
Steven Whitehousef55ab262006-02-21 12:51:39 +00001238 mutex_unlock(&fp->f_fl_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001239}
1240
1241/**
1242 * gfs2_flock - acquire/release a flock lock on a file
1243 * @file: the file pointer
1244 * @cmd: either modify or retrieve lock state, possibly wait
1245 * @fl: type and range of lock
1246 *
1247 * Returns: errno
1248 */
1249
1250static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl)
1251{
David Teiglandb3b94fa2006-01-16 16:50:04 +00001252 if (!(fl->fl_flags & FL_FLOCK))
1253 return -ENOLCK;
Abhijith Dasa12af1e2009-06-01 12:30:03 -05001254 if (fl->fl_type & LOCK_MAND)
1255 return -EOPNOTSUPP;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001256
David Teiglandb3b94fa2006-01-16 16:50:04 +00001257 if (fl->fl_type == F_UNLCK) {
1258 do_unflock(file, fl);
1259 return 0;
Steven Whitehoused00223f2006-10-02 10:28:05 -04001260 } else {
David Teiglandb3b94fa2006-01-16 16:50:04 +00001261 return do_flock(file, cmd, fl);
Steven Whitehoused00223f2006-10-02 10:28:05 -04001262 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001263}
1264
Christoph Hellwig10d21982009-04-07 19:42:17 +02001265const struct file_operations gfs2_file_fops = {
Steven Whitehouse26c1a572006-09-04 15:32:10 -04001266 .llseek = gfs2_llseek,
Andreas Gruenbacher967bcc92018-06-19 15:08:02 +01001267 .read_iter = gfs2_file_read_iter,
Al Viroda56e452014-04-03 14:11:01 -04001268 .write_iter = gfs2_file_write_iter,
Steven Whitehouse26c1a572006-09-04 15:32:10 -04001269 .unlocked_ioctl = gfs2_ioctl,
1270 .mmap = gfs2_mmap,
1271 .open = gfs2_open,
Bob Petersondf3fd112012-04-11 12:56:41 -04001272 .release = gfs2_release,
Steven Whitehouse26c1a572006-09-04 15:32:10 -04001273 .fsync = gfs2_fsync,
1274 .lock = gfs2_lock,
Steven Whitehouse26c1a572006-09-04 15:32:10 -04001275 .flock = gfs2_flock,
Al Viro82c156f2016-09-22 23:35:42 -04001276 .splice_read = generic_file_splice_read,
Bob Petersonf42a69f2015-02-19 08:02:16 -06001277 .splice_write = gfs2_file_splice_write,
Jeff Layton1c994a02014-08-27 06:49:41 -04001278 .setlease = simple_nosetlease,
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01001279 .fallocate = gfs2_fallocate,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001280};
1281
Christoph Hellwig10d21982009-04-07 19:42:17 +02001282const struct file_operations gfs2_dir_fops = {
Al Viro1d1bb232016-05-12 17:00:20 -04001283 .iterate_shared = gfs2_readdir,
Steven Whitehouse26c1a572006-09-04 15:32:10 -04001284 .unlocked_ioctl = gfs2_ioctl,
1285 .open = gfs2_open,
Bob Petersondf3fd112012-04-11 12:56:41 -04001286 .release = gfs2_release,
Steven Whitehouse26c1a572006-09-04 15:32:10 -04001287 .fsync = gfs2_fsync,
1288 .lock = gfs2_lock,
1289 .flock = gfs2_flock,
Arnd Bergmann6038f372010-08-15 18:52:59 +02001290 .llseek = default_llseek,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001291};
1292
Steven Whitehousef057f6c2009-01-12 10:43:39 +00001293#endif /* CONFIG_GFS2_FS_LOCKING_DLM */
1294
Christoph Hellwig10d21982009-04-07 19:42:17 +02001295const struct file_operations gfs2_file_fops_nolock = {
Wendy Chengc97bfe42007-11-29 17:56:51 -05001296 .llseek = gfs2_llseek,
Andreas Gruenbacher967bcc92018-06-19 15:08:02 +01001297 .read_iter = gfs2_file_read_iter,
Al Viroda56e452014-04-03 14:11:01 -04001298 .write_iter = gfs2_file_write_iter,
Wendy Chengc97bfe42007-11-29 17:56:51 -05001299 .unlocked_ioctl = gfs2_ioctl,
1300 .mmap = gfs2_mmap,
1301 .open = gfs2_open,
Bob Petersondf3fd112012-04-11 12:56:41 -04001302 .release = gfs2_release,
Wendy Chengc97bfe42007-11-29 17:56:51 -05001303 .fsync = gfs2_fsync,
Al Viro82c156f2016-09-22 23:35:42 -04001304 .splice_read = generic_file_splice_read,
Bob Petersonf42a69f2015-02-19 08:02:16 -06001305 .splice_write = gfs2_file_splice_write,
Steven Whitehousef057f6c2009-01-12 10:43:39 +00001306 .setlease = generic_setlease,
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01001307 .fallocate = gfs2_fallocate,
Wendy Chengc97bfe42007-11-29 17:56:51 -05001308};
1309
Christoph Hellwig10d21982009-04-07 19:42:17 +02001310const struct file_operations gfs2_dir_fops_nolock = {
Al Viro1d1bb232016-05-12 17:00:20 -04001311 .iterate_shared = gfs2_readdir,
Wendy Chengc97bfe42007-11-29 17:56:51 -05001312 .unlocked_ioctl = gfs2_ioctl,
1313 .open = gfs2_open,
Bob Petersondf3fd112012-04-11 12:56:41 -04001314 .release = gfs2_release,
Wendy Chengc97bfe42007-11-29 17:56:51 -05001315 .fsync = gfs2_fsync,
Arnd Bergmann6038f372010-08-15 18:52:59 +02001316 .llseek = default_llseek,
Wendy Chengc97bfe42007-11-29 17:56:51 -05001317};
1318