blob: 72c3866a73205217b9fe57d7863ce2376ce8002b [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>
David Teiglandb3b94fa2006-01-16 16:50:04 +000025#include <asm/uaccess.h>
Steven Whitehousef057f6c2009-01-12 10:43:39 +000026#include <linux/dlm.h>
27#include <linux/dlm_plock.h>
Kent Overstreeta27bb332013-05-07 16:19:08 -070028#include <linux/aio.h>
David Teiglandb3b94fa2006-01-16 16:50:04 +000029
30#include "gfs2.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050031#include "incore.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000032#include "bmap.h"
33#include "dir.h"
34#include "glock.h"
35#include "glops.h"
36#include "inode.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000037#include "log.h"
38#include "meta_io.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000039#include "quota.h"
40#include "rgrp.h"
41#include "trans.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050042#include "util.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000043
David Teiglandb3b94fa2006-01-16 16:50:04 +000044/**
45 * gfs2_llseek - seek to a location in a file
46 * @file: the file
47 * @offset: the offset
Andrew Morton965c8e52012-12-17 15:59:39 -080048 * @whence: Where to seek from (SEEK_SET, SEEK_CUR, or SEEK_END)
David Teiglandb3b94fa2006-01-16 16:50:04 +000049 *
50 * SEEK_END requires the glock for the file because it references the
51 * file's size.
52 *
53 * Returns: The new offset, or errno
54 */
55
Andrew Morton965c8e52012-12-17 15:59:39 -080056static loff_t gfs2_llseek(struct file *file, loff_t offset, int whence)
David Teiglandb3b94fa2006-01-16 16:50:04 +000057{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -040058 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
David Teiglandb3b94fa2006-01-16 16:50:04 +000059 struct gfs2_holder i_gh;
60 loff_t error;
61
Andrew Morton965c8e52012-12-17 15:59:39 -080062 switch (whence) {
Steven Whitehouse94536152011-08-23 10:19:25 +010063 case SEEK_END: /* These reference inode->i_size */
64 case SEEK_DATA:
65 case SEEK_HOLE:
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;
73 case SEEK_CUR:
74 case SEEK_SET:
Andrew Morton965c8e52012-12-17 15:59:39 -080075 error = generic_file_llseek(file, offset, whence);
Steven Whitehouse94536152011-08-23 10:19:25 +010076 break;
77 default:
78 error = -EINVAL;
79 }
David Teiglandb3b94fa2006-01-16 16:50:04 +000080
81 return error;
82}
83
David Teiglandb3b94fa2006-01-16 16:50:04 +000084/**
Al Virod81a8ef2013-05-16 14:14:48 -040085 * gfs2_readdir - Iterator for a directory
David Teiglandb3b94fa2006-01-16 16:50:04 +000086 * @file: The directory to read from
Al Virod81a8ef2013-05-16 14:14:48 -040087 * @ctx: What to feed directory entries to
David Teiglandb3b94fa2006-01-16 16:50:04 +000088 *
89 * Returns: errno
90 */
91
Al Virod81a8ef2013-05-16 14:14:48 -040092static int gfs2_readdir(struct file *file, struct dir_context *ctx)
David Teiglandb3b94fa2006-01-16 16:50:04 +000093{
Steven Whitehouse71b86f52006-03-28 14:14:04 -050094 struct inode *dir = file->f_mapping->host;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -040095 struct gfs2_inode *dip = GFS2_I(dir);
David Teiglandb3b94fa2006-01-16 16:50:04 +000096 struct gfs2_holder d_gh;
David Teiglandb3b94fa2006-01-16 16:50:04 +000097 int error;
98
Al Virod81a8ef2013-05-16 14:14:48 -040099 error = gfs2_glock_nq_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
100 if (error)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000101 return error;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000102
Al Virod81a8ef2013-05-16 14:14:48 -0400103 error = gfs2_dir_read(dir, ctx, &file->f_ra);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000104
105 gfs2_glock_dq_uninit(&d_gh);
106
David Teiglandb3b94fa2006-01-16 16:50:04 +0000107 return error;
108}
109
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400110/**
111 * fsflags_cvt
112 * @table: A table of 32 u32 flags
113 * @val: a 32 bit value to convert
114 *
115 * This function can be used to convert between fsflags values and
116 * GFS2's own flags values.
117 *
118 * Returns: the converted flags
119 */
120static u32 fsflags_cvt(const u32 *table, u32 val)
121{
122 u32 res = 0;
123 while(val) {
124 if (val & 1)
125 res |= *table;
126 table++;
127 val >>= 1;
128 }
129 return res;
130}
David Teiglandb3b94fa2006-01-16 16:50:04 +0000131
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400132static const u32 fsflags_to_gfs2[32] = {
133 [3] = GFS2_DIF_SYNC,
134 [4] = GFS2_DIF_IMMUTABLE,
135 [5] = GFS2_DIF_APPENDONLY,
136 [7] = GFS2_DIF_NOATIME,
137 [12] = GFS2_DIF_EXHASH,
Steven Whitehouseb9af7ca2007-07-18 11:40:06 +0100138 [14] = GFS2_DIF_INHERIT_JDATA,
Steven Whitehouse23d0bb82012-05-28 15:26:56 +0100139 [17] = GFS2_DIF_TOPDIR,
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500140};
141
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400142static const u32 gfs2_to_fsflags[32] = {
143 [gfs2fl_Sync] = FS_SYNC_FL,
144 [gfs2fl_Immutable] = FS_IMMUTABLE_FL,
145 [gfs2fl_AppendOnly] = FS_APPEND_FL,
146 [gfs2fl_NoAtime] = FS_NOATIME_FL,
147 [gfs2fl_ExHash] = FS_INDEX_FL,
Steven Whitehouse23d0bb82012-05-28 15:26:56 +0100148 [gfs2fl_TopLevel] = FS_TOPDIR_FL,
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400149 [gfs2fl_InheritJdata] = FS_JOURNAL_DATA_FL,
Steven Whitehouse7ea9ea82006-03-31 15:01:28 -0500150};
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500151
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400152static int gfs2_get_flags(struct file *filp, u32 __user *ptr)
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500153{
Al Viro496ad9a2013-01-23 17:07:38 -0500154 struct inode *inode = file_inode(filp);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400155 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500156 struct gfs2_holder gh;
157 int error;
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400158 u32 fsflags;
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500159
Steven Whitehouse719ee342008-09-18 13:53:59 +0100160 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
161 error = gfs2_glock_nq(&gh);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500162 if (error)
163 return error;
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400164
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000165 fsflags = fsflags_cvt(gfs2_to_fsflags, ip->i_diskflags);
166 if (!S_ISDIR(inode->i_mode) && ip->i_diskflags & GFS2_DIF_JDATA)
Steven Whitehousec9f6a6b2008-07-10 16:09:29 +0100167 fsflags |= FS_JOURNAL_DATA_FL;
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400168 if (put_user(fsflags, ptr))
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500169 error = -EFAULT;
170
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100171 gfs2_glock_dq(&gh);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500172 gfs2_holder_uninit(&gh);
173 return error;
174}
175
Steven Whitehouse6b124d82006-11-08 12:51:06 -0500176void gfs2_set_inode_flags(struct inode *inode)
177{
178 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehouse6b124d82006-11-08 12:51:06 -0500179 unsigned int flags = inode->i_flags;
180
Steven Whitehouse9964afb2011-06-16 14:06:55 +0100181 flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC|S_NOSEC);
182 if ((ip->i_eattr == 0) && !is_sxid(inode->i_mode))
183 inode->i_flags |= S_NOSEC;
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000184 if (ip->i_diskflags & GFS2_DIF_IMMUTABLE)
Steven Whitehouse6b124d82006-11-08 12:51:06 -0500185 flags |= S_IMMUTABLE;
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000186 if (ip->i_diskflags & GFS2_DIF_APPENDONLY)
Steven Whitehouse6b124d82006-11-08 12:51:06 -0500187 flags |= S_APPEND;
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000188 if (ip->i_diskflags & GFS2_DIF_NOATIME)
Steven Whitehouse6b124d82006-11-08 12:51:06 -0500189 flags |= S_NOATIME;
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000190 if (ip->i_diskflags & GFS2_DIF_SYNC)
Steven Whitehouse6b124d82006-11-08 12:51:06 -0500191 flags |= S_SYNC;
192 inode->i_flags = flags;
193}
194
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500195/* Flags that can be set by user space */
196#define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA| \
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500197 GFS2_DIF_IMMUTABLE| \
198 GFS2_DIF_APPENDONLY| \
199 GFS2_DIF_NOATIME| \
200 GFS2_DIF_SYNC| \
201 GFS2_DIF_SYSTEM| \
Steven Whitehouse23d0bb82012-05-28 15:26:56 +0100202 GFS2_DIF_TOPDIR| \
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500203 GFS2_DIF_INHERIT_JDATA)
204
205/**
206 * gfs2_set_flags - set flags on an inode
207 * @inode: The inode
208 * @flags: The flags to set
209 * @mask: Indicates which flags are valid
210 *
211 */
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400212static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask)
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500213{
Al Viro496ad9a2013-01-23 17:07:38 -0500214 struct inode *inode = file_inode(filp);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400215 struct gfs2_inode *ip = GFS2_I(inode);
216 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500217 struct buffer_head *bh;
218 struct gfs2_holder gh;
219 int error;
Steven Whitehouse55eccc62006-04-04 14:29:30 -0400220 u32 new_flags, flags;
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500221
Al Viroa561be72011-11-23 11:57:51 -0500222 error = mnt_want_write_file(filp);
Abhijith Das52f341c2006-07-21 02:03:21 -0400223 if (error)
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500224 return error;
225
Miklos Szeredif58ba882008-07-02 21:12:01 +0200226 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
227 if (error)
228 goto out_drop_write;
229
Steven Whitehouse7df0e032010-05-24 14:36:48 +0100230 error = -EACCES;
Serge E. Hallyn2e149672011-03-23 16:43:26 -0700231 if (!inode_owner_or_capable(inode))
Steven Whitehouse7df0e032010-05-24 14:36:48 +0100232 goto out;
233
234 error = 0;
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000235 flags = ip->i_diskflags;
Steven Whitehouse55eccc62006-04-04 14:29:30 -0400236 new_flags = (flags & ~mask) | (reqflags & mask);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500237 if ((new_flags ^ flags) == 0)
238 goto out;
239
240 error = -EINVAL;
241 if ((new_flags ^ flags) & ~GFS2_FLAGS_USER_SET)
242 goto out;
243
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500244 error = -EPERM;
245 if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE))
246 goto out;
247 if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY))
248 goto out;
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400249 if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) &&
Steven Whitehouseb9cb9812006-05-12 17:07:56 -0400250 !capable(CAP_LINUX_IMMUTABLE))
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500251 goto out;
Steven Whitehouseb9cb9812006-05-12 17:07:56 -0400252 if (!IS_IMMUTABLE(inode)) {
Al Viro10556cb2011-06-20 19:28:19 -0400253 error = gfs2_permission(inode, MAY_WRITE);
Steven Whitehouseb9cb9812006-05-12 17:07:56 -0400254 if (error)
255 goto out;
256 }
Steven Whitehouse55610932007-10-17 08:47:38 +0100257 if ((flags ^ new_flags) & GFS2_DIF_JDATA) {
258 if (flags & GFS2_DIF_JDATA)
259 gfs2_log_flush(sdp, ip->i_gl);
260 error = filemap_fdatawrite(inode->i_mapping);
261 if (error)
262 goto out;
263 error = filemap_fdatawait(inode->i_mapping);
264 if (error)
265 goto out;
266 }
Steven Whitehouse55eccc62006-04-04 14:29:30 -0400267 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500268 if (error)
269 goto out;
Steven Whitehouse55eccc62006-04-04 14:29:30 -0400270 error = gfs2_meta_inode_buffer(ip, &bh);
271 if (error)
272 goto out_trans_end;
Steven Whitehouse350a9b02012-12-14 12:36:02 +0000273 gfs2_trans_add_meta(ip->i_gl, bh);
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000274 ip->i_diskflags = new_flags;
Steven Whitehouse539e5d62006-10-31 15:07:05 -0500275 gfs2_dinode_out(ip, bh->b_data);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500276 brelse(bh);
Steven Whitehouse6b124d82006-11-08 12:51:06 -0500277 gfs2_set_inode_flags(inode);
Steven Whitehouse55610932007-10-17 08:47:38 +0100278 gfs2_set_aops(inode);
Steven Whitehouse55eccc62006-04-04 14:29:30 -0400279out_trans_end:
280 gfs2_trans_end(sdp);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500281out:
282 gfs2_glock_dq_uninit(&gh);
Miklos Szeredif58ba882008-07-02 21:12:01 +0200283out_drop_write:
Al Viro2a79f172011-12-09 08:06:57 -0500284 mnt_drop_write_file(filp);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500285 return error;
286}
287
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400288static int gfs2_set_flags(struct file *filp, u32 __user *ptr)
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500289{
Al Viro496ad9a2013-01-23 17:07:38 -0500290 struct inode *inode = file_inode(filp);
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400291 u32 fsflags, gfsflags;
Steven Whitehouse7df0e032010-05-24 14:36:48 +0100292
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400293 if (get_user(fsflags, ptr))
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500294 return -EFAULT;
Steven Whitehouse7df0e032010-05-24 14:36:48 +0100295
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400296 gfsflags = fsflags_cvt(fsflags_to_gfs2, fsflags);
Steven Whitehouseb9af7ca2007-07-18 11:40:06 +0100297 if (!S_ISDIR(inode->i_mode)) {
Steven Whitehouse23d0bb82012-05-28 15:26:56 +0100298 gfsflags &= ~GFS2_DIF_TOPDIR;
Steven Whitehouseb9af7ca2007-07-18 11:40:06 +0100299 if (gfsflags & GFS2_DIF_INHERIT_JDATA)
300 gfsflags ^= (GFS2_DIF_JDATA | GFS2_DIF_INHERIT_JDATA);
Steven Whitehouseb9af7ca2007-07-18 11:40:06 +0100301 return do_gfs2_set_flags(filp, gfsflags, ~0);
302 }
303 return do_gfs2_set_flags(filp, gfsflags, ~GFS2_DIF_JDATA);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500304}
305
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400306static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500307{
308 switch(cmd) {
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400309 case FS_IOC_GETFLAGS:
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400310 return gfs2_get_flags(filp, (u32 __user *)arg);
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400311 case FS_IOC_SETFLAGS:
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400312 return gfs2_set_flags(filp, (u32 __user *)arg);
Steven Whitehouse66fc0612012-02-08 12:58:32 +0000313 case FITRIM:
314 return gfs2_fitrim(filp, (void __user *)arg);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500315 }
316 return -ENOTTY;
317}
318
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100319/**
Steven Whitehouseda1dfb62012-07-26 11:30:54 +0100320 * gfs2_size_hint - Give a hint to the size of a write request
321 * @file: The struct file
322 * @offset: The file offset of the write
323 * @size: The length of the write
324 *
325 * When we are about to do a write, this function records the total
326 * write size in order to provide a suitable hint to the lower layers
327 * about how many blocks will be required.
328 *
329 */
330
331static void gfs2_size_hint(struct file *filep, loff_t offset, size_t size)
332{
Al Viro496ad9a2013-01-23 17:07:38 -0500333 struct inode *inode = file_inode(filep);
Steven Whitehouseda1dfb62012-07-26 11:30:54 +0100334 struct gfs2_sbd *sdp = GFS2_SB(inode);
335 struct gfs2_inode *ip = GFS2_I(inode);
336 size_t blks = (size + sdp->sd_sb.sb_bsize - 1) >> sdp->sd_sb.sb_bsize_shift;
337 int hint = min_t(size_t, INT_MAX, blks);
338
339 atomic_set(&ip->i_res->rs_sizehint, hint);
340}
341
342/**
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100343 * gfs2_allocate_page_backing - Use bmap to allocate blocks
344 * @page: The (locked) page to allocate backing for
345 *
346 * We try to allocate all the blocks required for the page in
347 * one go. This might fail for various reasons, so we keep
348 * trying until all the blocks to back this page are allocated.
349 * If some of the blocks are already allocated, thats ok too.
350 */
351
352static int gfs2_allocate_page_backing(struct page *page)
353{
354 struct inode *inode = page->mapping->host;
355 struct buffer_head bh;
356 unsigned long size = PAGE_CACHE_SIZE;
357 u64 lblock = page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
358
359 do {
360 bh.b_state = 0;
361 bh.b_size = size;
Bob Petersone9e1ef22007-12-10 14:13:27 -0600362 gfs2_block_map(inode, lblock, &bh, 1);
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100363 if (!buffer_mapped(&bh))
364 return -EIO;
365 size -= bh.b_size;
366 lblock += (bh.b_size >> inode->i_blkbits);
367 } while(size > 0);
368 return 0;
369}
370
371/**
372 * gfs2_page_mkwrite - Make a shared, mmap()ed, page writable
373 * @vma: The virtual memory area
374 * @page: The page which is about to become writable
375 *
376 * When the page becomes writable, we need to ensure that we have
377 * blocks allocated on disk to back that page.
378 */
379
Nick Pigginc2ec1752009-03-31 15:23:21 -0700380static int gfs2_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100381{
Nick Pigginc2ec1752009-03-31 15:23:21 -0700382 struct page *page = vmf->page;
Al Viro496ad9a2013-01-23 17:07:38 -0500383 struct inode *inode = file_inode(vma->vm_file);
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100384 struct gfs2_inode *ip = GFS2_I(inode);
385 struct gfs2_sbd *sdp = GFS2_SB(inode);
386 unsigned long last_index;
Benjamin Marzinskic8f554b2009-01-06 10:47:50 -0600387 u64 pos = page->index << PAGE_CACHE_SHIFT;
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100388 unsigned int data_blocks, ind_blocks, rblocks;
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100389 struct gfs2_holder gh;
Steven Whitehouse13d921e2011-09-07 15:12:51 +0100390 loff_t size;
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100391 int ret;
392
Jan Kara39263d5e2012-06-12 16:20:41 +0200393 sb_start_pagefault(inode->i_sb);
Steven Whitehouse13d921e2011-09-07 15:12:51 +0100394
Jan Karaa63e9b22012-06-12 16:20:26 +0200395 /* Update file times before taking page lock */
396 file_update_time(vma->vm_file);
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100397
Bob Peterson2b3dcf32013-05-28 10:04:44 -0400398 ret = get_write_access(inode);
399 if (ret)
400 goto out;
401
Bob Peterson0a305e42012-06-06 11:17:59 +0100402 ret = gfs2_rs_alloc(ip);
403 if (ret)
Bob Peterson2b3dcf32013-05-28 10:04:44 -0400404 goto out_write_access;
Bob Peterson0a305e42012-06-06 11:17:59 +0100405
Steven Whitehouseda1dfb62012-07-26 11:30:54 +0100406 gfs2_size_hint(vma->vm_file, pos, PAGE_CACHE_SIZE);
Bob Peterson8e2e0042012-07-19 08:12:40 -0400407
Steven Whitehouse719ee342008-09-18 13:53:59 +0100408 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
409 ret = gfs2_glock_nq(&gh);
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100410 if (ret)
Bob Peterson2b3dcf32013-05-28 10:04:44 -0400411 goto out_uninit;
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100412
Steven Whitehouse9c538832009-03-19 13:15:44 +0000413 set_bit(GLF_DIRTY, &ip->i_gl->gl_flags);
414 set_bit(GIF_SW_PAGED, &ip->i_flags);
415
Steven Whitehouse13d921e2011-09-07 15:12:51 +0100416 if (!gfs2_write_alloc_required(ip, pos, PAGE_CACHE_SIZE)) {
417 lock_page(page);
418 if (!PageUptodate(page) || page->mapping != inode->i_mapping) {
419 ret = -EAGAIN;
420 unlock_page(page);
421 }
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100422 goto out_unlock;
Steven Whitehouse13d921e2011-09-07 15:12:51 +0100423 }
424
Bob Peterson5407e242012-05-18 09:28:23 -0400425 ret = gfs2_rindex_update(sdp);
426 if (ret)
Steven Whitehouse6dbd8222008-01-10 15:18:55 +0000427 goto out_unlock;
428
Steven Whitehoused82661d2008-03-10 15:34:50 +0000429 ret = gfs2_quota_lock_check(ip);
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100430 if (ret)
Bob Peterson5407e242012-05-18 09:28:23 -0400431 goto out_unlock;
Steven Whitehouse7ed122e2008-12-10 10:28:10 +0000432 gfs2_write_calc_reserv(ip, PAGE_CACHE_SIZE, &data_blocks, &ind_blocks);
Steven Whitehouse9dbe9612012-10-31 10:37:10 +0000433 ret = gfs2_inplace_reserve(ip, data_blocks + ind_blocks, 0);
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100434 if (ret)
435 goto out_quota_unlock;
436
437 rblocks = RES_DINODE + ind_blocks;
438 if (gfs2_is_jdata(ip))
439 rblocks += data_blocks ? data_blocks : 1;
Benjamin Marzinskibf97b672010-09-27 16:00:04 -0500440 if (ind_blocks || data_blocks) {
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100441 rblocks += RES_STATFS + RES_QUOTA;
Steven Whitehouse71f890f2012-07-30 14:53:19 +0100442 rblocks += gfs2_rg_blocks(ip, data_blocks + ind_blocks);
Benjamin Marzinskibf97b672010-09-27 16:00:04 -0500443 }
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100444 ret = gfs2_trans_begin(sdp, rblocks, 0);
445 if (ret)
446 goto out_trans_fail;
447
448 lock_page(page);
449 ret = -EINVAL;
Steven Whitehouse13d921e2011-09-07 15:12:51 +0100450 size = i_size_read(inode);
451 last_index = (size - 1) >> PAGE_CACHE_SHIFT;
452 /* Check page index against inode size */
453 if (size == 0 || (page->index > last_index))
454 goto out_trans_end;
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100455
Steven Whitehouse13d921e2011-09-07 15:12:51 +0100456 ret = -EAGAIN;
457 /* If truncated, we must retry the operation, we may have raced
458 * with the glock demotion code.
459 */
460 if (!PageUptodate(page) || page->mapping != inode->i_mapping)
461 goto out_trans_end;
462
463 /* Unstuff, if required, and allocate backing blocks for page */
464 ret = 0;
465 if (gfs2_is_stuffed(ip))
466 ret = gfs2_unstuff_dinode(ip, page);
467 if (ret == 0)
468 ret = gfs2_allocate_page_backing(page);
469
470out_trans_end:
471 if (ret)
472 unlock_page(page);
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100473 gfs2_trans_end(sdp);
474out_trans_fail:
475 gfs2_inplace_release(ip);
476out_quota_unlock:
477 gfs2_quota_unlock(ip);
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100478out_unlock:
479 gfs2_glock_dq(&gh);
Bob Peterson2b3dcf32013-05-28 10:04:44 -0400480out_uninit:
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100481 gfs2_holder_uninit(&gh);
Steven Whitehouse13d921e2011-09-07 15:12:51 +0100482 if (ret == 0) {
483 set_page_dirty(page);
Darrick J. Wong1d1d1a72013-02-21 16:42:51 -0800484 wait_for_stable_page(page);
Steven Whitehouse13d921e2011-09-07 15:12:51 +0100485 }
Bob Peterson2b3dcf32013-05-28 10:04:44 -0400486out_write_access:
487 put_write_access(inode);
488out:
Jan Kara39263d5e2012-06-12 16:20:41 +0200489 sb_end_pagefault(inode->i_sb);
Steven Whitehouse13d921e2011-09-07 15:12:51 +0100490 return block_page_mkwrite_return(ret);
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100491}
492
Alexey Dobriyanf0f37e22009-09-27 22:29:37 +0400493static const struct vm_operations_struct gfs2_vm_ops = {
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100494 .fault = filemap_fault,
495 .page_mkwrite = gfs2_page_mkwrite,
Konstantin Khlebnikov0b173bc2012-10-08 16:28:46 -0700496 .remap_pages = generic_file_remap_pages,
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100497};
498
David Teiglandb3b94fa2006-01-16 16:50:04 +0000499/**
500 * gfs2_mmap -
501 * @file: The file to map
502 * @vma: The VMA which described the mapping
503 *
Steven Whitehouse48bf2b12009-04-29 13:59:35 +0100504 * There is no need to get a lock here unless we should be updating
505 * atime. We ignore any locking errors since the only consequence is
506 * a missed atime update (which will just be deferred until later).
507 *
508 * Returns: 0
David Teiglandb3b94fa2006-01-16 16:50:04 +0000509 */
510
511static int gfs2_mmap(struct file *file, struct vm_area_struct *vma)
512{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400513 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000514
Steven Whitehouseb9c93bb2011-02-02 14:48:10 +0000515 if (!(file->f_flags & O_NOATIME) &&
516 !IS_NOATIME(&ip->i_inode)) {
Steven Whitehouse48bf2b12009-04-29 13:59:35 +0100517 struct gfs2_holder i_gh;
518 int error;
519
Benjamin Marzinski3d162682012-11-06 00:49:28 -0600520 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
521 &i_gh);
Steven Whitehouseb9c93bb2011-02-02 14:48:10 +0000522 if (error)
523 return error;
Benjamin Marzinski3d162682012-11-06 00:49:28 -0600524 /* grab lock to update inode */
525 gfs2_glock_dq_uninit(&i_gh);
526 file_accessed(file);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000527 }
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100528 vma->vm_ops = &gfs2_vm_ops;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000529
Steven Whitehouse48bf2b12009-04-29 13:59:35 +0100530 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000531}
532
533/**
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100534 * gfs2_open_common - This is common to open and atomic_open
535 * @inode: The inode being opened
536 * @file: The file being opened
537 *
538 * This maybe called under a glock or not depending upon how it has
539 * been called. We must always be called under a glock for regular
540 * files, however. For other file types, it does not matter whether
541 * we hold the glock or not.
542 *
543 * Returns: Error code or 0 for success
544 */
545
546int gfs2_open_common(struct inode *inode, struct file *file)
547{
548 struct gfs2_file *fp;
549 int ret;
550
551 if (S_ISREG(inode->i_mode)) {
552 ret = generic_file_open(inode, file);
553 if (ret)
554 return ret;
555 }
556
557 fp = kzalloc(sizeof(struct gfs2_file), GFP_NOFS);
558 if (!fp)
559 return -ENOMEM;
560
561 mutex_init(&fp->f_fl_mutex);
562
563 gfs2_assert_warn(GFS2_SB(inode), !file->private_data);
564 file->private_data = fp;
565 return 0;
566}
567
568/**
David Teiglandb3b94fa2006-01-16 16:50:04 +0000569 * gfs2_open - open a file
570 * @inode: the inode to open
571 * @file: the struct file for this opening
572 *
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100573 * After atomic_open, this function is only used for opening files
574 * which are already cached. We must still get the glock for regular
575 * files to ensure that we have the file size uptodate for the large
576 * file check which is in the common code. That is only an issue for
577 * regular files though.
578 *
David Teiglandb3b94fa2006-01-16 16:50:04 +0000579 * Returns: errno
580 */
581
582static int gfs2_open(struct inode *inode, struct file *file)
583{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400584 struct gfs2_inode *ip = GFS2_I(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000585 struct gfs2_holder i_gh;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000586 int error;
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100587 bool need_unlock = false;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000588
Steven Whitehouseb60623c2006-11-01 12:22:46 -0500589 if (S_ISREG(ip->i_inode.i_mode)) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000590 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
591 &i_gh);
592 if (error)
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100593 return error;
594 need_unlock = true;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000595 }
596
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100597 error = gfs2_open_common(inode, file);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000598
Steven Whitehouse6d4ade92013-06-14 11:17:15 +0100599 if (need_unlock)
600 gfs2_glock_dq_uninit(&i_gh);
601
David Teiglandb3b94fa2006-01-16 16:50:04 +0000602 return error;
603}
604
605/**
Bob Petersondf3fd112012-04-11 12:56:41 -0400606 * gfs2_release - called to close a struct file
David Teiglandb3b94fa2006-01-16 16:50:04 +0000607 * @inode: the inode the struct file belongs to
608 * @file: the struct file being closed
609 *
610 * Returns: errno
611 */
612
Bob Petersondf3fd112012-04-11 12:56:41 -0400613static int gfs2_release(struct inode *inode, struct file *file)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000614{
Bob Peterson0a305e42012-06-06 11:17:59 +0100615 struct gfs2_inode *ip = GFS2_I(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000616
Bob Peterson8e2e0042012-07-19 08:12:40 -0400617 kfree(file->private_data);
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500618 file->private_data = NULL;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000619
Bob Peterson2b3dcf32013-05-28 10:04:44 -0400620 if (!(file->f_mode & FMODE_WRITE))
621 return 0;
Bob Peterson0a305e42012-06-06 11:17:59 +0100622
Bob Peterson2b3dcf32013-05-28 10:04:44 -0400623 gfs2_rs_delete(ip);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000624 return 0;
625}
626
627/**
628 * gfs2_fsync - sync the dirty data for a file (across the cluster)
Josef Bacik02c24a82011-07-16 20:44:56 -0400629 * @file: the file that points to the dentry
630 * @start: the start position in the file to sync
631 * @end: the end position in the file to sync
Steven Whitehousedba898b2011-04-14 09:54:02 +0100632 * @datasync: set if we can ignore timestamp changes
David Teiglandb3b94fa2006-01-16 16:50:04 +0000633 *
Steven Whitehouse2f0264d2011-07-27 10:58:48 +0100634 * We split the data flushing here so that we don't wait for the data
635 * until after we've also sent the metadata to disk. Note that for
636 * data=ordered, we will write & wait for the data at the log flush
637 * stage anyway, so this is unlikely to make much of a difference
638 * except in the data=writeback case.
639 *
640 * If the fdatawrite fails due to any reason except -EIO, we will
641 * continue the remainder of the fsync, although we'll still report
642 * the error at the end. This is to match filemap_write_and_wait_range()
643 * behaviour.
Steven Whitehouse34126f92006-12-07 09:13:14 -0500644 *
David Teiglandb3b94fa2006-01-16 16:50:04 +0000645 * Returns: errno
646 */
647
Josef Bacik02c24a82011-07-16 20:44:56 -0400648static int gfs2_fsync(struct file *file, loff_t start, loff_t end,
649 int datasync)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000650{
Steven Whitehouse2f0264d2011-07-27 10:58:48 +0100651 struct address_space *mapping = file->f_mapping;
652 struct inode *inode = mapping->host;
Steven Whitehouse33c3de32006-11-30 10:14:32 -0500653 int sync_state = inode->i_state & (I_DIRTY_SYNC|I_DIRTY_DATASYNC);
Steven Whitehousedba898b2011-04-14 09:54:02 +0100654 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehouse87654892011-11-08 14:04:20 +0000655 int ret = 0, ret1 = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000656
Steven Whitehouse2f0264d2011-07-27 10:58:48 +0100657 if (mapping->nrpages) {
658 ret1 = filemap_fdatawrite_range(mapping, start, end);
659 if (ret1 == -EIO)
660 return ret1;
661 }
Josef Bacik02c24a82011-07-16 20:44:56 -0400662
Steven Whitehousedba898b2011-04-14 09:54:02 +0100663 if (datasync)
664 sync_state &= ~I_DIRTY_SYNC;
665
666 if (sync_state) {
667 ret = sync_inode_metadata(inode, 1);
Steven Whitehouseb5b24d72011-09-07 10:33:25 +0100668 if (ret)
Steven Whitehousedba898b2011-04-14 09:54:02 +0100669 return ret;
Steven Whitehousef1818522011-08-05 10:12:47 +0100670 if (gfs2_is_jdata(ip))
671 filemap_write_and_wait(mapping);
Steven Whitehouseb5b24d72011-09-07 10:33:25 +0100672 gfs2_ail_flush(ip->i_gl, 1);
Steven Whitehouse33c3de32006-11-30 10:14:32 -0500673 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000674
Steven Whitehouse2f0264d2011-07-27 10:58:48 +0100675 if (mapping->nrpages)
676 ret = filemap_fdatawait_range(mapping, start, end);
677
678 return ret ? ret : ret1;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000679}
680
Steven Whitehouse56aa6162009-12-08 10:25:33 +0000681/**
682 * gfs2_file_aio_write - Perform a write to a file
683 * @iocb: The io context
684 * @iov: The data to write
685 * @nr_segs: Number of @iov segments
686 * @pos: The file position
687 *
688 * We have to do a lock/unlock here to refresh the inode size for
689 * O_APPEND writes, otherwise we can land up writing at the wrong
690 * offset. There is still a race, but provided the app is using its
691 * own file locking, this will make O_APPEND work as expected.
692 *
693 */
694
695static ssize_t gfs2_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
696 unsigned long nr_segs, loff_t pos)
697{
698 struct file *file = iocb->ki_filp;
Bob Peterson8e2e0042012-07-19 08:12:40 -0400699 size_t writesize = iov_length(iov, nr_segs);
Al Viro496ad9a2013-01-23 17:07:38 -0500700 struct gfs2_inode *ip = GFS2_I(file_inode(file));
Bob Peterson0a305e42012-06-06 11:17:59 +0100701 int ret;
702
703 ret = gfs2_rs_alloc(ip);
704 if (ret)
705 return ret;
Steven Whitehouse56aa6162009-12-08 10:25:33 +0000706
Steven Whitehouseda1dfb62012-07-26 11:30:54 +0100707 gfs2_size_hint(file, pos, writesize);
708
Steven Whitehouse56aa6162009-12-08 10:25:33 +0000709 if (file->f_flags & O_APPEND) {
Steven Whitehouse56aa6162009-12-08 10:25:33 +0000710 struct gfs2_holder gh;
Steven Whitehouse56aa6162009-12-08 10:25:33 +0000711
712 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
713 if (ret)
714 return ret;
715 gfs2_glock_dq_uninit(&gh);
716 }
717
718 return generic_file_aio_write(iocb, iov, nr_segs, pos);
719}
720
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100721static int fallocate_chunk(struct inode *inode, loff_t offset, loff_t len,
722 int mode)
723{
724 struct gfs2_inode *ip = GFS2_I(inode);
725 struct buffer_head *dibh;
726 int error;
Benjamin Marzinski58a7d5f2012-03-08 13:16:32 -0600727 loff_t size = len;
Benjamin Marzinski64dd1532011-09-12 18:15:24 -0500728 unsigned int nr_blks;
729 sector_t lblock = offset >> inode->i_blkbits;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100730
731 error = gfs2_meta_inode_buffer(ip, &dibh);
732 if (unlikely(error))
Benjamin Marzinski64dd1532011-09-12 18:15:24 -0500733 return error;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100734
Steven Whitehouse350a9b02012-12-14 12:36:02 +0000735 gfs2_trans_add_meta(ip->i_gl, dibh);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100736
737 if (gfs2_is_stuffed(ip)) {
738 error = gfs2_unstuff_dinode(ip, NULL);
739 if (unlikely(error))
740 goto out;
741 }
742
Benjamin Marzinski64dd1532011-09-12 18:15:24 -0500743 while (len) {
744 struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
745 bh_map.b_size = len;
746 set_buffer_zeronew(&bh_map);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100747
Benjamin Marzinski64dd1532011-09-12 18:15:24 -0500748 error = gfs2_block_map(inode, lblock, &bh_map, 1);
749 if (unlikely(error))
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100750 goto out;
Benjamin Marzinski64dd1532011-09-12 18:15:24 -0500751 len -= bh_map.b_size;
752 nr_blks = bh_map.b_size >> inode->i_blkbits;
753 lblock += nr_blks;
754 if (!buffer_new(&bh_map))
755 continue;
756 if (unlikely(!buffer_zeronew(&bh_map))) {
757 error = -EIO;
758 goto out;
759 }
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100760 }
Benjamin Marzinski58a7d5f2012-03-08 13:16:32 -0600761 if (offset + size > inode->i_size && !(mode & FALLOC_FL_KEEP_SIZE))
762 i_size_write(inode, offset + size);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100763
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100764 mark_inode_dirty(inode);
765
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100766out:
Benjamin Marzinski64dd1532011-09-12 18:15:24 -0500767 brelse(dibh);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100768 return error;
769}
770
771static void calc_max_reserv(struct gfs2_inode *ip, loff_t max, loff_t *len,
772 unsigned int *data_blocks, unsigned int *ind_blocks)
773{
774 const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
Steven Whitehouse54335b12011-09-01 13:31:59 +0100775 unsigned int max_blocks = ip->i_rgd->rd_free_clone;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100776 unsigned int tmp, max_data = max_blocks - 3 * (sdp->sd_max_height - 1);
777
778 for (tmp = max_data; tmp > sdp->sd_diptrs;) {
779 tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs);
780 max_data -= tmp;
781 }
782 /* This calculation isn't the exact reverse of gfs2_write_calc_reserve,
783 so it might end up with fewer data blocks */
784 if (max_data <= *data_blocks)
785 return;
786 *data_blocks = max_data;
787 *ind_blocks = max_blocks - max_data;
788 *len = ((loff_t)max_data - 3) << sdp->sd_sb.sb_bsize_shift;
789 if (*len > max) {
790 *len = max;
791 gfs2_write_calc_reserv(ip, max, data_blocks, ind_blocks);
792 }
793}
794
795static long gfs2_fallocate(struct file *file, int mode, loff_t offset,
796 loff_t len)
797{
Al Viro496ad9a2013-01-23 17:07:38 -0500798 struct inode *inode = file_inode(file);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100799 struct gfs2_sbd *sdp = GFS2_SB(inode);
800 struct gfs2_inode *ip = GFS2_I(inode);
801 unsigned int data_blocks = 0, ind_blocks = 0, rblocks;
802 loff_t bytes, max_bytes;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100803 int error;
Steven Whitehouse4442f2e2011-11-21 10:01:25 +0000804 const loff_t pos = offset;
805 const loff_t count = len;
Benjamin Marzinski6905d9e2011-04-26 01:13:24 -0500806 loff_t bsize_mask = ~((loff_t)sdp->sd_sb.sb_bsize - 1);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100807 loff_t next = (offset + len - 1) >> sdp->sd_sb.sb_bsize_shift;
Benjamin Marzinski64dd1532011-09-12 18:15:24 -0500808 loff_t max_chunk_size = UINT_MAX & bsize_mask;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100809 next = (next + 1) << sdp->sd_sb.sb_bsize_shift;
810
811 /* We only support the FALLOC_FL_KEEP_SIZE mode */
812 if (mode & ~FALLOC_FL_KEEP_SIZE)
813 return -EOPNOTSUPP;
814
Benjamin Marzinski6905d9e2011-04-26 01:13:24 -0500815 offset &= bsize_mask;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100816
817 len = next - offset;
818 bytes = sdp->sd_max_rg_data * sdp->sd_sb.sb_bsize / 2;
819 if (!bytes)
820 bytes = UINT_MAX;
Benjamin Marzinski6905d9e2011-04-26 01:13:24 -0500821 bytes &= bsize_mask;
822 if (bytes == 0)
823 bytes = sdp->sd_sb.sb_bsize;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100824
Bob Peterson0a305e42012-06-06 11:17:59 +0100825 error = gfs2_rs_alloc(ip);
826 if (error)
827 return error;
828
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100829 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &ip->i_gh);
830 error = gfs2_glock_nq(&ip->i_gh);
831 if (unlikely(error))
832 goto out_uninit;
833
Steven Whitehouseda1dfb62012-07-26 11:30:54 +0100834 gfs2_size_hint(file, offset, len);
Bob Peterson8e2e0042012-07-19 08:12:40 -0400835
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100836 while (len > 0) {
837 if (len < bytes)
838 bytes = len;
Benjamin Marzinski58a7d5f2012-03-08 13:16:32 -0600839 if (!gfs2_write_alloc_required(ip, offset, bytes)) {
840 len -= bytes;
841 offset += bytes;
842 continue;
843 }
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100844 error = gfs2_quota_lock_check(ip);
845 if (error)
Bob Peterson5407e242012-05-18 09:28:23 -0400846 goto out_unlock;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100847
848retry:
849 gfs2_write_calc_reserv(ip, bytes, &data_blocks, &ind_blocks);
850
Steven Whitehouse9dbe9612012-10-31 10:37:10 +0000851 error = gfs2_inplace_reserve(ip, data_blocks + ind_blocks, 0);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100852 if (error) {
853 if (error == -ENOSPC && bytes > sdp->sd_sb.sb_bsize) {
854 bytes >>= 1;
Benjamin Marzinski6905d9e2011-04-26 01:13:24 -0500855 bytes &= bsize_mask;
856 if (bytes == 0)
857 bytes = sdp->sd_sb.sb_bsize;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100858 goto retry;
859 }
860 goto out_qunlock;
861 }
862 max_bytes = bytes;
Benjamin Marzinski64dd1532011-09-12 18:15:24 -0500863 calc_max_reserv(ip, (len > max_chunk_size)? max_chunk_size: len,
864 &max_bytes, &data_blocks, &ind_blocks);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100865
866 rblocks = RES_DINODE + ind_blocks + RES_STATFS + RES_QUOTA +
Steven Whitehouse71f890f2012-07-30 14:53:19 +0100867 RES_RG_HDR + gfs2_rg_blocks(ip, data_blocks + ind_blocks);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100868 if (gfs2_is_jdata(ip))
869 rblocks += data_blocks ? data_blocks : 1;
870
871 error = gfs2_trans_begin(sdp, rblocks,
872 PAGE_CACHE_SIZE/sdp->sd_sb.sb_bsize);
873 if (error)
874 goto out_trans_fail;
875
876 error = fallocate_chunk(inode, offset, max_bytes, mode);
877 gfs2_trans_end(sdp);
878
879 if (error)
880 goto out_trans_fail;
881
882 len -= max_bytes;
883 offset += max_bytes;
884 gfs2_inplace_release(ip);
885 gfs2_quota_unlock(ip);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100886 }
Steven Whitehouse4442f2e2011-11-21 10:01:25 +0000887
888 if (error == 0)
889 error = generic_write_sync(file, pos, count);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100890 goto out_unlock;
891
892out_trans_fail:
893 gfs2_inplace_release(ip);
894out_qunlock:
895 gfs2_quota_unlock(ip);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100896out_unlock:
897 gfs2_glock_dq(&ip->i_gh);
898out_uninit:
899 gfs2_holder_uninit(&ip->i_gh);
900 return error;
901}
902
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000903#ifdef CONFIG_GFS2_FS_LOCKING_DLM
904
David Teiglandb3b94fa2006-01-16 16:50:04 +0000905/**
Marc Eshel60446062007-01-15 18:33:36 -0500906 * gfs2_setlease - acquire/release a file lease
907 * @file: the file pointer
908 * @arg: lease type
909 * @fl: file lock
910 *
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000911 * We don't currently have a way to enforce a lease across the whole
912 * cluster; until we do, disable leases (by just returning -EINVAL),
913 * unless the administrator has requested purely local locking.
914 *
Jeff Layton1c8c6012013-06-21 08:58:15 -0400915 * Locking: called under i_lock
Arnd Bergmannb89f4322010-09-18 15:09:31 +0200916 *
Marc Eshel60446062007-01-15 18:33:36 -0500917 * Returns: errno
918 */
919
920static int gfs2_setlease(struct file *file, long arg, struct file_lock **fl)
921{
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000922 return -EINVAL;
Steven Whitehouseda755fd2008-01-30 15:34:04 +0000923}
924
Marc Eshel60446062007-01-15 18:33:36 -0500925/**
David Teiglandb3b94fa2006-01-16 16:50:04 +0000926 * gfs2_lock - acquire/release a posix lock on a file
927 * @file: the file pointer
928 * @cmd: either modify or retrieve lock state, possibly wait
929 * @fl: type and range of lock
930 *
931 * Returns: errno
932 */
933
934static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl)
935{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400936 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
937 struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000938 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000939
David Teiglandb3b94fa2006-01-16 16:50:04 +0000940 if (!(fl->fl_flags & FL_POSIX))
941 return -ENOLCK;
Sachin Prabhu720e7742010-03-11 12:24:45 -0500942 if (__mandatory_lock(&ip->i_inode) && fl->fl_type != F_UNLCK)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000943 return -ENOLCK;
944
Marc Eshel586759f2006-11-14 16:37:25 -0500945 if (cmd == F_CANCELLK) {
946 /* Hack: */
947 cmd = F_SETLK;
948 fl->fl_type = F_UNLCK;
949 }
Steven Whitehousec2952d22013-03-14 15:49:59 +0000950 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) {
951 if (fl->fl_type == F_UNLCK)
952 posix_lock_file_wait(file, fl);
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000953 return -EIO;
Steven Whitehousec2952d22013-03-14 15:49:59 +0000954 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000955 if (IS_GETLK(cmd))
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000956 return dlm_posix_get(ls->ls_dlm, ip->i_no_addr, file, fl);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000957 else if (fl->fl_type == F_UNLCK)
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000958 return dlm_posix_unlock(ls->ls_dlm, ip->i_no_addr, file, fl);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000959 else
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000960 return dlm_posix_lock(ls->ls_dlm, ip->i_no_addr, file, cmd, fl);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000961}
962
David Teiglandb3b94fa2006-01-16 16:50:04 +0000963static int do_flock(struct file *file, int cmd, struct file_lock *fl)
964{
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500965 struct gfs2_file *fp = file->private_data;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000966 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
Al Viro496ad9a2013-01-23 17:07:38 -0500967 struct gfs2_inode *ip = GFS2_I(file_inode(file));
David Teiglandb3b94fa2006-01-16 16:50:04 +0000968 struct gfs2_glock *gl;
969 unsigned int state;
970 int flags;
971 int error = 0;
972
973 state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED;
Steven Whitehouse6802e342008-05-21 17:03:22 +0100974 flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY) | GL_EXACT | GL_NOCACHE;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000975
Steven Whitehousef55ab262006-02-21 12:51:39 +0000976 mutex_lock(&fp->f_fl_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000977
978 gl = fl_gh->gh_gl;
979 if (gl) {
980 if (fl_gh->gh_state == state)
981 goto out;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000982 flock_lock_file_wait(file,
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400983 &(struct file_lock){.fl_type = F_UNLCK});
Abhijith Dasb4c20162007-09-13 23:35:27 -0500984 gfs2_glock_dq_wait(fl_gh);
985 gfs2_holder_reinit(state, flags, fl_gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000986 } else {
Steven Whitehouse6802e342008-05-21 17:03:22 +0100987 error = gfs2_glock_get(GFS2_SB(&ip->i_inode), ip->i_no_addr,
988 &gfs2_flock_glops, CREATE, &gl);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000989 if (error)
990 goto out;
Abhijith Dasb4c20162007-09-13 23:35:27 -0500991 gfs2_holder_init(gl, state, flags, fl_gh);
992 gfs2_glock_put(gl);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000993 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000994 error = gfs2_glock_nq(fl_gh);
995 if (error) {
996 gfs2_holder_uninit(fl_gh);
997 if (error == GLR_TRYFAILED)
998 error = -EAGAIN;
999 } else {
1000 error = flock_lock_file_wait(file, fl);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001001 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001002 }
1003
Steven Whitehouse420b9e52006-07-31 15:42:17 -04001004out:
Steven Whitehousef55ab262006-02-21 12:51:39 +00001005 mutex_unlock(&fp->f_fl_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001006 return error;
1007}
1008
1009static void do_unflock(struct file *file, struct file_lock *fl)
1010{
Steven Whitehouse5c676f62006-02-27 17:23:27 -05001011 struct gfs2_file *fp = file->private_data;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001012 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
1013
Steven Whitehousef55ab262006-02-21 12:51:39 +00001014 mutex_lock(&fp->f_fl_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001015 flock_lock_file_wait(file, fl);
Steven Whitehouse0a334432011-03-09 11:14:32 +00001016 if (fl_gh->gh_gl) {
1017 gfs2_glock_dq_wait(fl_gh);
1018 gfs2_holder_uninit(fl_gh);
1019 }
Steven Whitehousef55ab262006-02-21 12:51:39 +00001020 mutex_unlock(&fp->f_fl_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001021}
1022
1023/**
1024 * gfs2_flock - acquire/release a flock lock on a file
1025 * @file: the file pointer
1026 * @cmd: either modify or retrieve lock state, possibly wait
1027 * @fl: type and range of lock
1028 *
1029 * Returns: errno
1030 */
1031
1032static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl)
1033{
David Teiglandb3b94fa2006-01-16 16:50:04 +00001034 if (!(fl->fl_flags & FL_FLOCK))
1035 return -ENOLCK;
Abhijith Dasa12af1e2009-06-01 12:30:03 -05001036 if (fl->fl_type & LOCK_MAND)
1037 return -EOPNOTSUPP;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001038
David Teiglandb3b94fa2006-01-16 16:50:04 +00001039 if (fl->fl_type == F_UNLCK) {
1040 do_unflock(file, fl);
1041 return 0;
Steven Whitehoused00223f2006-10-02 10:28:05 -04001042 } else {
David Teiglandb3b94fa2006-01-16 16:50:04 +00001043 return do_flock(file, cmd, fl);
Steven Whitehoused00223f2006-10-02 10:28:05 -04001044 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001045}
1046
Christoph Hellwig10d21982009-04-07 19:42:17 +02001047const struct file_operations gfs2_file_fops = {
Steven Whitehouse26c1a572006-09-04 15:32:10 -04001048 .llseek = gfs2_llseek,
Steven Whitehoused00223f2006-10-02 10:28:05 -04001049 .read = do_sync_read,
Steven Whitehouse26c1a572006-09-04 15:32:10 -04001050 .aio_read = generic_file_aio_read,
Steven Whitehoused00223f2006-10-02 10:28:05 -04001051 .write = do_sync_write,
Steven Whitehouse56aa6162009-12-08 10:25:33 +00001052 .aio_write = gfs2_file_aio_write,
Steven Whitehouse26c1a572006-09-04 15:32:10 -04001053 .unlocked_ioctl = gfs2_ioctl,
1054 .mmap = gfs2_mmap,
1055 .open = gfs2_open,
Bob Petersondf3fd112012-04-11 12:56:41 -04001056 .release = gfs2_release,
Steven Whitehouse26c1a572006-09-04 15:32:10 -04001057 .fsync = gfs2_fsync,
1058 .lock = gfs2_lock,
Steven Whitehouse26c1a572006-09-04 15:32:10 -04001059 .flock = gfs2_flock,
1060 .splice_read = generic_file_splice_read,
1061 .splice_write = generic_file_splice_write,
Marc Eshel60446062007-01-15 18:33:36 -05001062 .setlease = gfs2_setlease,
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01001063 .fallocate = gfs2_fallocate,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001064};
1065
Christoph Hellwig10d21982009-04-07 19:42:17 +02001066const struct file_operations gfs2_dir_fops = {
Al Virod81a8ef2013-05-16 14:14:48 -04001067 .iterate = gfs2_readdir,
Steven Whitehouse26c1a572006-09-04 15:32:10 -04001068 .unlocked_ioctl = gfs2_ioctl,
1069 .open = gfs2_open,
Bob Petersondf3fd112012-04-11 12:56:41 -04001070 .release = gfs2_release,
Steven Whitehouse26c1a572006-09-04 15:32:10 -04001071 .fsync = gfs2_fsync,
1072 .lock = gfs2_lock,
1073 .flock = gfs2_flock,
Arnd Bergmann6038f372010-08-15 18:52:59 +02001074 .llseek = default_llseek,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001075};
1076
Steven Whitehousef057f6c2009-01-12 10:43:39 +00001077#endif /* CONFIG_GFS2_FS_LOCKING_DLM */
1078
Christoph Hellwig10d21982009-04-07 19:42:17 +02001079const struct file_operations gfs2_file_fops_nolock = {
Wendy Chengc97bfe42007-11-29 17:56:51 -05001080 .llseek = gfs2_llseek,
1081 .read = do_sync_read,
1082 .aio_read = generic_file_aio_read,
1083 .write = do_sync_write,
Steven Whitehouse56aa6162009-12-08 10:25:33 +00001084 .aio_write = gfs2_file_aio_write,
Wendy Chengc97bfe42007-11-29 17:56:51 -05001085 .unlocked_ioctl = gfs2_ioctl,
1086 .mmap = gfs2_mmap,
1087 .open = gfs2_open,
Bob Petersondf3fd112012-04-11 12:56:41 -04001088 .release = gfs2_release,
Wendy Chengc97bfe42007-11-29 17:56:51 -05001089 .fsync = gfs2_fsync,
1090 .splice_read = generic_file_splice_read,
1091 .splice_write = generic_file_splice_write,
Steven Whitehousef057f6c2009-01-12 10:43:39 +00001092 .setlease = generic_setlease,
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01001093 .fallocate = gfs2_fallocate,
Wendy Chengc97bfe42007-11-29 17:56:51 -05001094};
1095
Christoph Hellwig10d21982009-04-07 19:42:17 +02001096const struct file_operations gfs2_dir_fops_nolock = {
Al Virod81a8ef2013-05-16 14:14:48 -04001097 .iterate = gfs2_readdir,
Wendy Chengc97bfe42007-11-29 17:56:51 -05001098 .unlocked_ioctl = gfs2_ioctl,
1099 .open = gfs2_open,
Bob Petersondf3fd112012-04-11 12:56:41 -04001100 .release = gfs2_release,
Wendy Chengc97bfe42007-11-29 17:56:51 -05001101 .fsync = gfs2_fsync,
Arnd Bergmann6038f372010-08-15 18:52:59 +02001102 .llseek = default_llseek,
Wendy Chengc97bfe42007-11-29 17:56:51 -05001103};
1104