blob: 019f45e450971341f9cfba1c50a0116295b2dfd3 [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>
David Teiglandb3b94fa2006-01-16 16:50:04 +000028
29#include "gfs2.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050030#include "incore.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000031#include "bmap.h"
32#include "dir.h"
33#include "glock.h"
34#include "glops.h"
35#include "inode.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000036#include "log.h"
37#include "meta_io.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000038#include "quota.h"
39#include "rgrp.h"
40#include "trans.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050041#include "util.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000042
David Teiglandb3b94fa2006-01-16 16:50:04 +000043/**
44 * gfs2_llseek - seek to a location in a file
45 * @file: the file
46 * @offset: the offset
Andrew Morton965c8e52012-12-17 15:59:39 -080047 * @whence: Where to seek from (SEEK_SET, SEEK_CUR, or SEEK_END)
David Teiglandb3b94fa2006-01-16 16:50:04 +000048 *
49 * SEEK_END requires the glock for the file because it references the
50 * file's size.
51 *
52 * Returns: The new offset, or errno
53 */
54
Andrew Morton965c8e52012-12-17 15:59:39 -080055static loff_t gfs2_llseek(struct file *file, loff_t offset, int whence)
David Teiglandb3b94fa2006-01-16 16:50:04 +000056{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -040057 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
David Teiglandb3b94fa2006-01-16 16:50:04 +000058 struct gfs2_holder i_gh;
59 loff_t error;
60
Andrew Morton965c8e52012-12-17 15:59:39 -080061 switch (whence) {
Steven Whitehouse94536152011-08-23 10:19:25 +010062 case SEEK_END: /* These reference inode->i_size */
63 case SEEK_DATA:
64 case SEEK_HOLE:
David Teiglandb3b94fa2006-01-16 16:50:04 +000065 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
66 &i_gh);
67 if (!error) {
Andrew Morton965c8e52012-12-17 15:59:39 -080068 error = generic_file_llseek(file, offset, whence);
David Teiglandb3b94fa2006-01-16 16:50:04 +000069 gfs2_glock_dq_uninit(&i_gh);
70 }
Steven Whitehouse94536152011-08-23 10:19:25 +010071 break;
72 case SEEK_CUR:
73 case SEEK_SET:
Andrew Morton965c8e52012-12-17 15:59:39 -080074 error = generic_file_llseek(file, offset, whence);
Steven Whitehouse94536152011-08-23 10:19:25 +010075 break;
76 default:
77 error = -EINVAL;
78 }
David Teiglandb3b94fa2006-01-16 16:50:04 +000079
80 return error;
81}
82
David Teiglandb3b94fa2006-01-16 16:50:04 +000083/**
Steven Whitehousef0e522a2006-09-19 16:41:11 -040084 * gfs2_readdir - Read directory entries from a directory
David Teiglandb3b94fa2006-01-16 16:50:04 +000085 * @file: The directory to read from
86 * @dirent: Buffer for dirents
87 * @filldir: Function used to do the copying
88 *
89 * Returns: errno
90 */
91
Steven Whitehousef0e522a2006-09-19 16:41:11 -040092static int gfs2_readdir(struct file *file, void *dirent, filldir_t filldir)
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;
Steven Whitehousecd915492006-09-04 12:49:07 -040097 u64 offset = file->f_pos;
David Teiglandb3b94fa2006-01-16 16:50:04 +000098 int error;
99
Steven Whitehouse719ee342008-09-18 13:53:59 +0100100 gfs2_holder_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
101 error = gfs2_glock_nq(&d_gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000102 if (error) {
103 gfs2_holder_uninit(&d_gh);
104 return error;
105 }
106
Bob Petersondfe4d342011-10-27 12:16:06 -0400107 error = gfs2_dir_read(dir, &offset, dirent, filldir, &file->f_ra);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000108
109 gfs2_glock_dq_uninit(&d_gh);
110
111 file->f_pos = offset;
112
113 return error;
114}
115
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400116/**
117 * fsflags_cvt
118 * @table: A table of 32 u32 flags
119 * @val: a 32 bit value to convert
120 *
121 * This function can be used to convert between fsflags values and
122 * GFS2's own flags values.
123 *
124 * Returns: the converted flags
125 */
126static u32 fsflags_cvt(const u32 *table, u32 val)
127{
128 u32 res = 0;
129 while(val) {
130 if (val & 1)
131 res |= *table;
132 table++;
133 val >>= 1;
134 }
135 return res;
136}
David Teiglandb3b94fa2006-01-16 16:50:04 +0000137
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400138static const u32 fsflags_to_gfs2[32] = {
139 [3] = GFS2_DIF_SYNC,
140 [4] = GFS2_DIF_IMMUTABLE,
141 [5] = GFS2_DIF_APPENDONLY,
142 [7] = GFS2_DIF_NOATIME,
143 [12] = GFS2_DIF_EXHASH,
Steven Whitehouseb9af7ca2007-07-18 11:40:06 +0100144 [14] = GFS2_DIF_INHERIT_JDATA,
Steven Whitehouse23d0bb82012-05-28 15:26:56 +0100145 [17] = GFS2_DIF_TOPDIR,
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500146};
147
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400148static const u32 gfs2_to_fsflags[32] = {
149 [gfs2fl_Sync] = FS_SYNC_FL,
150 [gfs2fl_Immutable] = FS_IMMUTABLE_FL,
151 [gfs2fl_AppendOnly] = FS_APPEND_FL,
152 [gfs2fl_NoAtime] = FS_NOATIME_FL,
153 [gfs2fl_ExHash] = FS_INDEX_FL,
Steven Whitehouse23d0bb82012-05-28 15:26:56 +0100154 [gfs2fl_TopLevel] = FS_TOPDIR_FL,
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400155 [gfs2fl_InheritJdata] = FS_JOURNAL_DATA_FL,
Steven Whitehouse7ea9ea82006-03-31 15:01:28 -0500156};
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500157
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400158static int gfs2_get_flags(struct file *filp, u32 __user *ptr)
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500159{
Al Viro496ad9a2013-01-23 17:07:38 -0500160 struct inode *inode = file_inode(filp);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400161 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500162 struct gfs2_holder gh;
163 int error;
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400164 u32 fsflags;
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500165
Steven Whitehouse719ee342008-09-18 13:53:59 +0100166 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
167 error = gfs2_glock_nq(&gh);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500168 if (error)
169 return error;
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400170
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000171 fsflags = fsflags_cvt(gfs2_to_fsflags, ip->i_diskflags);
172 if (!S_ISDIR(inode->i_mode) && ip->i_diskflags & GFS2_DIF_JDATA)
Steven Whitehousec9f6a6b2008-07-10 16:09:29 +0100173 fsflags |= FS_JOURNAL_DATA_FL;
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400174 if (put_user(fsflags, ptr))
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500175 error = -EFAULT;
176
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100177 gfs2_glock_dq(&gh);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500178 gfs2_holder_uninit(&gh);
179 return error;
180}
181
Steven Whitehouse6b124d82006-11-08 12:51:06 -0500182void gfs2_set_inode_flags(struct inode *inode)
183{
184 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehouse6b124d82006-11-08 12:51:06 -0500185 unsigned int flags = inode->i_flags;
186
Steven Whitehouse9964afb2011-06-16 14:06:55 +0100187 flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC|S_NOSEC);
188 if ((ip->i_eattr == 0) && !is_sxid(inode->i_mode))
189 inode->i_flags |= S_NOSEC;
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000190 if (ip->i_diskflags & GFS2_DIF_IMMUTABLE)
Steven Whitehouse6b124d82006-11-08 12:51:06 -0500191 flags |= S_IMMUTABLE;
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000192 if (ip->i_diskflags & GFS2_DIF_APPENDONLY)
Steven Whitehouse6b124d82006-11-08 12:51:06 -0500193 flags |= S_APPEND;
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000194 if (ip->i_diskflags & GFS2_DIF_NOATIME)
Steven Whitehouse6b124d82006-11-08 12:51:06 -0500195 flags |= S_NOATIME;
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000196 if (ip->i_diskflags & GFS2_DIF_SYNC)
Steven Whitehouse6b124d82006-11-08 12:51:06 -0500197 flags |= S_SYNC;
198 inode->i_flags = flags;
199}
200
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500201/* Flags that can be set by user space */
202#define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA| \
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500203 GFS2_DIF_IMMUTABLE| \
204 GFS2_DIF_APPENDONLY| \
205 GFS2_DIF_NOATIME| \
206 GFS2_DIF_SYNC| \
207 GFS2_DIF_SYSTEM| \
Steven Whitehouse23d0bb82012-05-28 15:26:56 +0100208 GFS2_DIF_TOPDIR| \
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500209 GFS2_DIF_INHERIT_JDATA)
210
211/**
212 * gfs2_set_flags - set flags on an inode
213 * @inode: The inode
214 * @flags: The flags to set
215 * @mask: Indicates which flags are valid
216 *
217 */
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400218static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask)
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500219{
Al Viro496ad9a2013-01-23 17:07:38 -0500220 struct inode *inode = file_inode(filp);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400221 struct gfs2_inode *ip = GFS2_I(inode);
222 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500223 struct buffer_head *bh;
224 struct gfs2_holder gh;
225 int error;
Steven Whitehouse55eccc62006-04-04 14:29:30 -0400226 u32 new_flags, flags;
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500227
Al Viroa561be72011-11-23 11:57:51 -0500228 error = mnt_want_write_file(filp);
Abhijith Das52f341c2006-07-21 02:03:21 -0400229 if (error)
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500230 return error;
231
Miklos Szeredif58ba882008-07-02 21:12:01 +0200232 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
233 if (error)
234 goto out_drop_write;
235
Steven Whitehouse7df0e032010-05-24 14:36:48 +0100236 error = -EACCES;
Serge E. Hallyn2e149672011-03-23 16:43:26 -0700237 if (!inode_owner_or_capable(inode))
Steven Whitehouse7df0e032010-05-24 14:36:48 +0100238 goto out;
239
240 error = 0;
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000241 flags = ip->i_diskflags;
Steven Whitehouse55eccc62006-04-04 14:29:30 -0400242 new_flags = (flags & ~mask) | (reqflags & mask);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500243 if ((new_flags ^ flags) == 0)
244 goto out;
245
246 error = -EINVAL;
247 if ((new_flags ^ flags) & ~GFS2_FLAGS_USER_SET)
248 goto out;
249
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500250 error = -EPERM;
251 if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE))
252 goto out;
253 if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY))
254 goto out;
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400255 if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) &&
Steven Whitehouseb9cb9812006-05-12 17:07:56 -0400256 !capable(CAP_LINUX_IMMUTABLE))
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500257 goto out;
Steven Whitehouseb9cb9812006-05-12 17:07:56 -0400258 if (!IS_IMMUTABLE(inode)) {
Al Viro10556cb2011-06-20 19:28:19 -0400259 error = gfs2_permission(inode, MAY_WRITE);
Steven Whitehouseb9cb9812006-05-12 17:07:56 -0400260 if (error)
261 goto out;
262 }
Steven Whitehouse55610932007-10-17 08:47:38 +0100263 if ((flags ^ new_flags) & GFS2_DIF_JDATA) {
264 if (flags & GFS2_DIF_JDATA)
265 gfs2_log_flush(sdp, ip->i_gl);
266 error = filemap_fdatawrite(inode->i_mapping);
267 if (error)
268 goto out;
269 error = filemap_fdatawait(inode->i_mapping);
270 if (error)
271 goto out;
272 }
Steven Whitehouse55eccc62006-04-04 14:29:30 -0400273 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500274 if (error)
275 goto out;
Steven Whitehouse55eccc62006-04-04 14:29:30 -0400276 error = gfs2_meta_inode_buffer(ip, &bh);
277 if (error)
278 goto out_trans_end;
Steven Whitehouse350a9b02012-12-14 12:36:02 +0000279 gfs2_trans_add_meta(ip->i_gl, bh);
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000280 ip->i_diskflags = new_flags;
Steven Whitehouse539e5d62006-10-31 15:07:05 -0500281 gfs2_dinode_out(ip, bh->b_data);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500282 brelse(bh);
Steven Whitehouse6b124d82006-11-08 12:51:06 -0500283 gfs2_set_inode_flags(inode);
Steven Whitehouse55610932007-10-17 08:47:38 +0100284 gfs2_set_aops(inode);
Steven Whitehouse55eccc62006-04-04 14:29:30 -0400285out_trans_end:
286 gfs2_trans_end(sdp);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500287out:
288 gfs2_glock_dq_uninit(&gh);
Miklos Szeredif58ba882008-07-02 21:12:01 +0200289out_drop_write:
Al Viro2a79f172011-12-09 08:06:57 -0500290 mnt_drop_write_file(filp);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500291 return error;
292}
293
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400294static int gfs2_set_flags(struct file *filp, u32 __user *ptr)
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500295{
Al Viro496ad9a2013-01-23 17:07:38 -0500296 struct inode *inode = file_inode(filp);
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400297 u32 fsflags, gfsflags;
Steven Whitehouse7df0e032010-05-24 14:36:48 +0100298
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400299 if (get_user(fsflags, ptr))
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500300 return -EFAULT;
Steven Whitehouse7df0e032010-05-24 14:36:48 +0100301
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400302 gfsflags = fsflags_cvt(fsflags_to_gfs2, fsflags);
Steven Whitehouseb9af7ca2007-07-18 11:40:06 +0100303 if (!S_ISDIR(inode->i_mode)) {
Steven Whitehouse23d0bb82012-05-28 15:26:56 +0100304 gfsflags &= ~GFS2_DIF_TOPDIR;
Steven Whitehouseb9af7ca2007-07-18 11:40:06 +0100305 if (gfsflags & GFS2_DIF_INHERIT_JDATA)
306 gfsflags ^= (GFS2_DIF_JDATA | GFS2_DIF_INHERIT_JDATA);
Steven Whitehouseb9af7ca2007-07-18 11:40:06 +0100307 return do_gfs2_set_flags(filp, gfsflags, ~0);
308 }
309 return do_gfs2_set_flags(filp, gfsflags, ~GFS2_DIF_JDATA);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500310}
311
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400312static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500313{
314 switch(cmd) {
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400315 case FS_IOC_GETFLAGS:
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400316 return gfs2_get_flags(filp, (u32 __user *)arg);
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400317 case FS_IOC_SETFLAGS:
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400318 return gfs2_set_flags(filp, (u32 __user *)arg);
Steven Whitehouse66fc0612012-02-08 12:58:32 +0000319 case FITRIM:
320 return gfs2_fitrim(filp, (void __user *)arg);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500321 }
322 return -ENOTTY;
323}
324
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100325/**
Steven Whitehouseda1dfb62012-07-26 11:30:54 +0100326 * gfs2_size_hint - Give a hint to the size of a write request
327 * @file: The struct file
328 * @offset: The file offset of the write
329 * @size: The length of the write
330 *
331 * When we are about to do a write, this function records the total
332 * write size in order to provide a suitable hint to the lower layers
333 * about how many blocks will be required.
334 *
335 */
336
337static void gfs2_size_hint(struct file *filep, loff_t offset, size_t size)
338{
Al Viro496ad9a2013-01-23 17:07:38 -0500339 struct inode *inode = file_inode(filep);
Steven Whitehouseda1dfb62012-07-26 11:30:54 +0100340 struct gfs2_sbd *sdp = GFS2_SB(inode);
341 struct gfs2_inode *ip = GFS2_I(inode);
342 size_t blks = (size + sdp->sd_sb.sb_bsize - 1) >> sdp->sd_sb.sb_bsize_shift;
343 int hint = min_t(size_t, INT_MAX, blks);
344
345 atomic_set(&ip->i_res->rs_sizehint, hint);
346}
347
348/**
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100349 * gfs2_allocate_page_backing - Use bmap to allocate blocks
350 * @page: The (locked) page to allocate backing for
351 *
352 * We try to allocate all the blocks required for the page in
353 * one go. This might fail for various reasons, so we keep
354 * trying until all the blocks to back this page are allocated.
355 * If some of the blocks are already allocated, thats ok too.
356 */
357
358static int gfs2_allocate_page_backing(struct page *page)
359{
360 struct inode *inode = page->mapping->host;
361 struct buffer_head bh;
362 unsigned long size = PAGE_CACHE_SIZE;
363 u64 lblock = page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
364
365 do {
366 bh.b_state = 0;
367 bh.b_size = size;
Bob Petersone9e1ef22007-12-10 14:13:27 -0600368 gfs2_block_map(inode, lblock, &bh, 1);
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100369 if (!buffer_mapped(&bh))
370 return -EIO;
371 size -= bh.b_size;
372 lblock += (bh.b_size >> inode->i_blkbits);
373 } while(size > 0);
374 return 0;
375}
376
377/**
378 * gfs2_page_mkwrite - Make a shared, mmap()ed, page writable
379 * @vma: The virtual memory area
380 * @page: The page which is about to become writable
381 *
382 * When the page becomes writable, we need to ensure that we have
383 * blocks allocated on disk to back that page.
384 */
385
Nick Pigginc2ec1752009-03-31 15:23:21 -0700386static int gfs2_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100387{
Nick Pigginc2ec1752009-03-31 15:23:21 -0700388 struct page *page = vmf->page;
Al Viro496ad9a2013-01-23 17:07:38 -0500389 struct inode *inode = file_inode(vma->vm_file);
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100390 struct gfs2_inode *ip = GFS2_I(inode);
391 struct gfs2_sbd *sdp = GFS2_SB(inode);
392 unsigned long last_index;
Benjamin Marzinskic8f554b2009-01-06 10:47:50 -0600393 u64 pos = page->index << PAGE_CACHE_SHIFT;
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100394 unsigned int data_blocks, ind_blocks, rblocks;
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100395 struct gfs2_holder gh;
Steven Whitehouse13d921e2011-09-07 15:12:51 +0100396 loff_t size;
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100397 int ret;
398
Jan Kara39263d5e2012-06-12 16:20:41 +0200399 sb_start_pagefault(inode->i_sb);
Steven Whitehouse13d921e2011-09-07 15:12:51 +0100400
Jan Karaa63e9b22012-06-12 16:20:26 +0200401 /* Update file times before taking page lock */
402 file_update_time(vma->vm_file);
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100403
Bob Peterson0a305e42012-06-06 11:17:59 +0100404 ret = gfs2_rs_alloc(ip);
405 if (ret)
406 return ret;
407
Steven Whitehouseda1dfb62012-07-26 11:30:54 +0100408 gfs2_size_hint(vma->vm_file, pos, PAGE_CACHE_SIZE);
Bob Peterson8e2e0042012-07-19 08:12:40 -0400409
Steven Whitehouse719ee342008-09-18 13:53:59 +0100410 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
411 ret = gfs2_glock_nq(&gh);
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100412 if (ret)
413 goto out;
414
Steven Whitehouse9c538832009-03-19 13:15:44 +0000415 set_bit(GLF_DIRTY, &ip->i_gl->gl_flags);
416 set_bit(GIF_SW_PAGED, &ip->i_flags);
417
Steven Whitehouse13d921e2011-09-07 15:12:51 +0100418 if (!gfs2_write_alloc_required(ip, pos, PAGE_CACHE_SIZE)) {
419 lock_page(page);
420 if (!PageUptodate(page) || page->mapping != inode->i_mapping) {
421 ret = -EAGAIN;
422 unlock_page(page);
423 }
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100424 goto out_unlock;
Steven Whitehouse13d921e2011-09-07 15:12:51 +0100425 }
426
Bob Peterson5407e242012-05-18 09:28:23 -0400427 ret = gfs2_rindex_update(sdp);
428 if (ret)
Steven Whitehouse6dbd8222008-01-10 15:18:55 +0000429 goto out_unlock;
430
Steven Whitehoused82661d2008-03-10 15:34:50 +0000431 ret = gfs2_quota_lock_check(ip);
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100432 if (ret)
Bob Peterson5407e242012-05-18 09:28:23 -0400433 goto out_unlock;
Steven Whitehouse7ed122e2008-12-10 10:28:10 +0000434 gfs2_write_calc_reserv(ip, PAGE_CACHE_SIZE, &data_blocks, &ind_blocks);
Steven Whitehouse9dbe9612012-10-31 10:37:10 +0000435 ret = gfs2_inplace_reserve(ip, data_blocks + ind_blocks, 0);
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100436 if (ret)
437 goto out_quota_unlock;
438
439 rblocks = RES_DINODE + ind_blocks;
440 if (gfs2_is_jdata(ip))
441 rblocks += data_blocks ? data_blocks : 1;
Benjamin Marzinskibf97b672010-09-27 16:00:04 -0500442 if (ind_blocks || data_blocks) {
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100443 rblocks += RES_STATFS + RES_QUOTA;
Steven Whitehouse71f890f2012-07-30 14:53:19 +0100444 rblocks += gfs2_rg_blocks(ip, data_blocks + ind_blocks);
Benjamin Marzinskibf97b672010-09-27 16:00:04 -0500445 }
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100446 ret = gfs2_trans_begin(sdp, rblocks, 0);
447 if (ret)
448 goto out_trans_fail;
449
450 lock_page(page);
451 ret = -EINVAL;
Steven Whitehouse13d921e2011-09-07 15:12:51 +0100452 size = i_size_read(inode);
453 last_index = (size - 1) >> PAGE_CACHE_SHIFT;
454 /* Check page index against inode size */
455 if (size == 0 || (page->index > last_index))
456 goto out_trans_end;
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100457
Steven Whitehouse13d921e2011-09-07 15:12:51 +0100458 ret = -EAGAIN;
459 /* If truncated, we must retry the operation, we may have raced
460 * with the glock demotion code.
461 */
462 if (!PageUptodate(page) || page->mapping != inode->i_mapping)
463 goto out_trans_end;
464
465 /* Unstuff, if required, and allocate backing blocks for page */
466 ret = 0;
467 if (gfs2_is_stuffed(ip))
468 ret = gfs2_unstuff_dinode(ip, page);
469 if (ret == 0)
470 ret = gfs2_allocate_page_backing(page);
471
472out_trans_end:
473 if (ret)
474 unlock_page(page);
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100475 gfs2_trans_end(sdp);
476out_trans_fail:
477 gfs2_inplace_release(ip);
478out_quota_unlock:
479 gfs2_quota_unlock(ip);
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100480out_unlock:
481 gfs2_glock_dq(&gh);
482out:
483 gfs2_holder_uninit(&gh);
Steven Whitehouse13d921e2011-09-07 15:12:51 +0100484 if (ret == 0) {
485 set_page_dirty(page);
Darrick J. Wong1d1d1a72013-02-21 16:42:51 -0800486 wait_for_stable_page(page);
Steven Whitehouse13d921e2011-09-07 15:12:51 +0100487 }
Jan Kara39263d5e2012-06-12 16:20:41 +0200488 sb_end_pagefault(inode->i_sb);
Steven Whitehouse13d921e2011-09-07 15:12:51 +0100489 return block_page_mkwrite_return(ret);
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100490}
491
Alexey Dobriyanf0f37e22009-09-27 22:29:37 +0400492static const struct vm_operations_struct gfs2_vm_ops = {
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100493 .fault = filemap_fault,
494 .page_mkwrite = gfs2_page_mkwrite,
Konstantin Khlebnikov0b173bc2012-10-08 16:28:46 -0700495 .remap_pages = generic_file_remap_pages,
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100496};
497
David Teiglandb3b94fa2006-01-16 16:50:04 +0000498/**
499 * gfs2_mmap -
500 * @file: The file to map
501 * @vma: The VMA which described the mapping
502 *
Steven Whitehouse48bf2b12009-04-29 13:59:35 +0100503 * There is no need to get a lock here unless we should be updating
504 * atime. We ignore any locking errors since the only consequence is
505 * a missed atime update (which will just be deferred until later).
506 *
507 * Returns: 0
David Teiglandb3b94fa2006-01-16 16:50:04 +0000508 */
509
510static int gfs2_mmap(struct file *file, struct vm_area_struct *vma)
511{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400512 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000513
Steven Whitehouseb9c93bb2011-02-02 14:48:10 +0000514 if (!(file->f_flags & O_NOATIME) &&
515 !IS_NOATIME(&ip->i_inode)) {
Steven Whitehouse48bf2b12009-04-29 13:59:35 +0100516 struct gfs2_holder i_gh;
517 int error;
518
Benjamin Marzinski3d162682012-11-06 00:49:28 -0600519 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
520 &i_gh);
Steven Whitehouseb9c93bb2011-02-02 14:48:10 +0000521 if (error)
522 return error;
Benjamin Marzinski3d162682012-11-06 00:49:28 -0600523 /* grab lock to update inode */
524 gfs2_glock_dq_uninit(&i_gh);
525 file_accessed(file);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000526 }
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100527 vma->vm_ops = &gfs2_vm_ops;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000528
Steven Whitehouse48bf2b12009-04-29 13:59:35 +0100529 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000530}
531
532/**
533 * gfs2_open - open a file
534 * @inode: the inode to open
535 * @file: the struct file for this opening
536 *
537 * Returns: errno
538 */
539
540static int gfs2_open(struct inode *inode, struct file *file)
541{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400542 struct gfs2_inode *ip = GFS2_I(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000543 struct gfs2_holder i_gh;
544 struct gfs2_file *fp;
545 int error;
546
David Teiglandb3b94fa2006-01-16 16:50:04 +0000547 fp = kzalloc(sizeof(struct gfs2_file), GFP_KERNEL);
548 if (!fp)
549 return -ENOMEM;
550
Steven Whitehousef55ab262006-02-21 12:51:39 +0000551 mutex_init(&fp->f_fl_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000552
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400553 gfs2_assert_warn(GFS2_SB(inode), !file->private_data);
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500554 file->private_data = fp;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000555
Steven Whitehouseb60623c2006-11-01 12:22:46 -0500556 if (S_ISREG(ip->i_inode.i_mode)) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000557 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
558 &i_gh);
559 if (error)
560 goto fail;
561
562 if (!(file->f_flags & O_LARGEFILE) &&
Steven Whitehousea2e0f792010-08-11 09:53:11 +0100563 i_size_read(inode) > MAX_NON_LFS) {
Alan Coxa9c62a12007-10-16 23:30:22 -0700564 error = -EOVERFLOW;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000565 goto fail_gunlock;
566 }
567
David Teiglandb3b94fa2006-01-16 16:50:04 +0000568 gfs2_glock_dq_uninit(&i_gh);
569 }
570
571 return 0;
572
Steven Whitehouse420b9e52006-07-31 15:42:17 -0400573fail_gunlock:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000574 gfs2_glock_dq_uninit(&i_gh);
Steven Whitehouse420b9e52006-07-31 15:42:17 -0400575fail:
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500576 file->private_data = NULL;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000577 kfree(fp);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000578 return error;
579}
580
581/**
Bob Petersondf3fd112012-04-11 12:56:41 -0400582 * gfs2_release - called to close a struct file
David Teiglandb3b94fa2006-01-16 16:50:04 +0000583 * @inode: the inode the struct file belongs to
584 * @file: the struct file being closed
585 *
586 * Returns: errno
587 */
588
Bob Petersondf3fd112012-04-11 12:56:41 -0400589static int gfs2_release(struct inode *inode, struct file *file)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000590{
Bob Peterson0a305e42012-06-06 11:17:59 +0100591 struct gfs2_inode *ip = GFS2_I(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000592
Bob Peterson8e2e0042012-07-19 08:12:40 -0400593 kfree(file->private_data);
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500594 file->private_data = NULL;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000595
Bob Peterson8e2e0042012-07-19 08:12:40 -0400596 if ((file->f_mode & FMODE_WRITE) &&
Bob Peterson0a305e42012-06-06 11:17:59 +0100597 (atomic_read(&inode->i_writecount) == 1))
598 gfs2_rs_delete(ip);
599
David Teiglandb3b94fa2006-01-16 16:50:04 +0000600 return 0;
601}
602
603/**
604 * gfs2_fsync - sync the dirty data for a file (across the cluster)
Josef Bacik02c24a82011-07-16 20:44:56 -0400605 * @file: the file that points to the dentry
606 * @start: the start position in the file to sync
607 * @end: the end position in the file to sync
Steven Whitehousedba898b2011-04-14 09:54:02 +0100608 * @datasync: set if we can ignore timestamp changes
David Teiglandb3b94fa2006-01-16 16:50:04 +0000609 *
Steven Whitehouse2f0264d2011-07-27 10:58:48 +0100610 * We split the data flushing here so that we don't wait for the data
611 * until after we've also sent the metadata to disk. Note that for
612 * data=ordered, we will write & wait for the data at the log flush
613 * stage anyway, so this is unlikely to make much of a difference
614 * except in the data=writeback case.
615 *
616 * If the fdatawrite fails due to any reason except -EIO, we will
617 * continue the remainder of the fsync, although we'll still report
618 * the error at the end. This is to match filemap_write_and_wait_range()
619 * behaviour.
Steven Whitehouse34126f92006-12-07 09:13:14 -0500620 *
David Teiglandb3b94fa2006-01-16 16:50:04 +0000621 * Returns: errno
622 */
623
Josef Bacik02c24a82011-07-16 20:44:56 -0400624static int gfs2_fsync(struct file *file, loff_t start, loff_t end,
625 int datasync)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000626{
Steven Whitehouse2f0264d2011-07-27 10:58:48 +0100627 struct address_space *mapping = file->f_mapping;
628 struct inode *inode = mapping->host;
Steven Whitehouse33c3de32006-11-30 10:14:32 -0500629 int sync_state = inode->i_state & (I_DIRTY_SYNC|I_DIRTY_DATASYNC);
Steven Whitehousedba898b2011-04-14 09:54:02 +0100630 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehouse87654892011-11-08 14:04:20 +0000631 int ret = 0, ret1 = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000632
Steven Whitehouse2f0264d2011-07-27 10:58:48 +0100633 if (mapping->nrpages) {
634 ret1 = filemap_fdatawrite_range(mapping, start, end);
635 if (ret1 == -EIO)
636 return ret1;
637 }
Josef Bacik02c24a82011-07-16 20:44:56 -0400638
Steven Whitehousedba898b2011-04-14 09:54:02 +0100639 if (datasync)
640 sync_state &= ~I_DIRTY_SYNC;
641
642 if (sync_state) {
643 ret = sync_inode_metadata(inode, 1);
Steven Whitehouseb5b24d72011-09-07 10:33:25 +0100644 if (ret)
Steven Whitehousedba898b2011-04-14 09:54:02 +0100645 return ret;
Steven Whitehousef1818522011-08-05 10:12:47 +0100646 if (gfs2_is_jdata(ip))
647 filemap_write_and_wait(mapping);
Steven Whitehouseb5b24d72011-09-07 10:33:25 +0100648 gfs2_ail_flush(ip->i_gl, 1);
Steven Whitehouse33c3de32006-11-30 10:14:32 -0500649 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000650
Steven Whitehouse2f0264d2011-07-27 10:58:48 +0100651 if (mapping->nrpages)
652 ret = filemap_fdatawait_range(mapping, start, end);
653
654 return ret ? ret : ret1;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000655}
656
Steven Whitehouse56aa6162009-12-08 10:25:33 +0000657/**
658 * gfs2_file_aio_write - Perform a write to a file
659 * @iocb: The io context
660 * @iov: The data to write
661 * @nr_segs: Number of @iov segments
662 * @pos: The file position
663 *
664 * We have to do a lock/unlock here to refresh the inode size for
665 * O_APPEND writes, otherwise we can land up writing at the wrong
666 * offset. There is still a race, but provided the app is using its
667 * own file locking, this will make O_APPEND work as expected.
668 *
669 */
670
671static ssize_t gfs2_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
672 unsigned long nr_segs, loff_t pos)
673{
674 struct file *file = iocb->ki_filp;
Bob Peterson8e2e0042012-07-19 08:12:40 -0400675 size_t writesize = iov_length(iov, nr_segs);
Al Viro496ad9a2013-01-23 17:07:38 -0500676 struct gfs2_inode *ip = GFS2_I(file_inode(file));
Bob Peterson0a305e42012-06-06 11:17:59 +0100677 int ret;
678
679 ret = gfs2_rs_alloc(ip);
680 if (ret)
681 return ret;
Steven Whitehouse56aa6162009-12-08 10:25:33 +0000682
Steven Whitehouseda1dfb62012-07-26 11:30:54 +0100683 gfs2_size_hint(file, pos, writesize);
684
Steven Whitehouse56aa6162009-12-08 10:25:33 +0000685 if (file->f_flags & O_APPEND) {
Steven Whitehouse56aa6162009-12-08 10:25:33 +0000686 struct gfs2_holder gh;
Steven Whitehouse56aa6162009-12-08 10:25:33 +0000687
688 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
689 if (ret)
690 return ret;
691 gfs2_glock_dq_uninit(&gh);
692 }
693
694 return generic_file_aio_write(iocb, iov, nr_segs, pos);
695}
696
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100697static int fallocate_chunk(struct inode *inode, loff_t offset, loff_t len,
698 int mode)
699{
700 struct gfs2_inode *ip = GFS2_I(inode);
701 struct buffer_head *dibh;
702 int error;
Benjamin Marzinski58a7d5f2012-03-08 13:16:32 -0600703 loff_t size = len;
Benjamin Marzinski64dd1532011-09-12 18:15:24 -0500704 unsigned int nr_blks;
705 sector_t lblock = offset >> inode->i_blkbits;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100706
707 error = gfs2_meta_inode_buffer(ip, &dibh);
708 if (unlikely(error))
Benjamin Marzinski64dd1532011-09-12 18:15:24 -0500709 return error;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100710
Steven Whitehouse350a9b02012-12-14 12:36:02 +0000711 gfs2_trans_add_meta(ip->i_gl, dibh);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100712
713 if (gfs2_is_stuffed(ip)) {
714 error = gfs2_unstuff_dinode(ip, NULL);
715 if (unlikely(error))
716 goto out;
717 }
718
Benjamin Marzinski64dd1532011-09-12 18:15:24 -0500719 while (len) {
720 struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
721 bh_map.b_size = len;
722 set_buffer_zeronew(&bh_map);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100723
Benjamin Marzinski64dd1532011-09-12 18:15:24 -0500724 error = gfs2_block_map(inode, lblock, &bh_map, 1);
725 if (unlikely(error))
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100726 goto out;
Benjamin Marzinski64dd1532011-09-12 18:15:24 -0500727 len -= bh_map.b_size;
728 nr_blks = bh_map.b_size >> inode->i_blkbits;
729 lblock += nr_blks;
730 if (!buffer_new(&bh_map))
731 continue;
732 if (unlikely(!buffer_zeronew(&bh_map))) {
733 error = -EIO;
734 goto out;
735 }
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100736 }
Benjamin Marzinski58a7d5f2012-03-08 13:16:32 -0600737 if (offset + size > inode->i_size && !(mode & FALLOC_FL_KEEP_SIZE))
738 i_size_write(inode, offset + size);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100739
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100740 mark_inode_dirty(inode);
741
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100742out:
Benjamin Marzinski64dd1532011-09-12 18:15:24 -0500743 brelse(dibh);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100744 return error;
745}
746
747static void calc_max_reserv(struct gfs2_inode *ip, loff_t max, loff_t *len,
748 unsigned int *data_blocks, unsigned int *ind_blocks)
749{
750 const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
Steven Whitehouse54335b12011-09-01 13:31:59 +0100751 unsigned int max_blocks = ip->i_rgd->rd_free_clone;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100752 unsigned int tmp, max_data = max_blocks - 3 * (sdp->sd_max_height - 1);
753
754 for (tmp = max_data; tmp > sdp->sd_diptrs;) {
755 tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs);
756 max_data -= tmp;
757 }
758 /* This calculation isn't the exact reverse of gfs2_write_calc_reserve,
759 so it might end up with fewer data blocks */
760 if (max_data <= *data_blocks)
761 return;
762 *data_blocks = max_data;
763 *ind_blocks = max_blocks - max_data;
764 *len = ((loff_t)max_data - 3) << sdp->sd_sb.sb_bsize_shift;
765 if (*len > max) {
766 *len = max;
767 gfs2_write_calc_reserv(ip, max, data_blocks, ind_blocks);
768 }
769}
770
771static long gfs2_fallocate(struct file *file, int mode, loff_t offset,
772 loff_t len)
773{
Al Viro496ad9a2013-01-23 17:07:38 -0500774 struct inode *inode = file_inode(file);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100775 struct gfs2_sbd *sdp = GFS2_SB(inode);
776 struct gfs2_inode *ip = GFS2_I(inode);
777 unsigned int data_blocks = 0, ind_blocks = 0, rblocks;
778 loff_t bytes, max_bytes;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100779 int error;
Steven Whitehouse4442f2e2011-11-21 10:01:25 +0000780 const loff_t pos = offset;
781 const loff_t count = len;
Benjamin Marzinski6905d9e2011-04-26 01:13:24 -0500782 loff_t bsize_mask = ~((loff_t)sdp->sd_sb.sb_bsize - 1);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100783 loff_t next = (offset + len - 1) >> sdp->sd_sb.sb_bsize_shift;
Benjamin Marzinski64dd1532011-09-12 18:15:24 -0500784 loff_t max_chunk_size = UINT_MAX & bsize_mask;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100785 next = (next + 1) << sdp->sd_sb.sb_bsize_shift;
786
787 /* We only support the FALLOC_FL_KEEP_SIZE mode */
788 if (mode & ~FALLOC_FL_KEEP_SIZE)
789 return -EOPNOTSUPP;
790
Benjamin Marzinski6905d9e2011-04-26 01:13:24 -0500791 offset &= bsize_mask;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100792
793 len = next - offset;
794 bytes = sdp->sd_max_rg_data * sdp->sd_sb.sb_bsize / 2;
795 if (!bytes)
796 bytes = UINT_MAX;
Benjamin Marzinski6905d9e2011-04-26 01:13:24 -0500797 bytes &= bsize_mask;
798 if (bytes == 0)
799 bytes = sdp->sd_sb.sb_bsize;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100800
Bob Peterson0a305e42012-06-06 11:17:59 +0100801 error = gfs2_rs_alloc(ip);
802 if (error)
803 return error;
804
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100805 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &ip->i_gh);
806 error = gfs2_glock_nq(&ip->i_gh);
807 if (unlikely(error))
808 goto out_uninit;
809
Steven Whitehouseda1dfb62012-07-26 11:30:54 +0100810 gfs2_size_hint(file, offset, len);
Bob Peterson8e2e0042012-07-19 08:12:40 -0400811
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100812 while (len > 0) {
813 if (len < bytes)
814 bytes = len;
Benjamin Marzinski58a7d5f2012-03-08 13:16:32 -0600815 if (!gfs2_write_alloc_required(ip, offset, bytes)) {
816 len -= bytes;
817 offset += bytes;
818 continue;
819 }
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100820 error = gfs2_quota_lock_check(ip);
821 if (error)
Bob Peterson5407e242012-05-18 09:28:23 -0400822 goto out_unlock;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100823
824retry:
825 gfs2_write_calc_reserv(ip, bytes, &data_blocks, &ind_blocks);
826
Steven Whitehouse9dbe9612012-10-31 10:37:10 +0000827 error = gfs2_inplace_reserve(ip, data_blocks + ind_blocks, 0);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100828 if (error) {
829 if (error == -ENOSPC && bytes > sdp->sd_sb.sb_bsize) {
830 bytes >>= 1;
Benjamin Marzinski6905d9e2011-04-26 01:13:24 -0500831 bytes &= bsize_mask;
832 if (bytes == 0)
833 bytes = sdp->sd_sb.sb_bsize;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100834 goto retry;
835 }
836 goto out_qunlock;
837 }
838 max_bytes = bytes;
Benjamin Marzinski64dd1532011-09-12 18:15:24 -0500839 calc_max_reserv(ip, (len > max_chunk_size)? max_chunk_size: len,
840 &max_bytes, &data_blocks, &ind_blocks);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100841
842 rblocks = RES_DINODE + ind_blocks + RES_STATFS + RES_QUOTA +
Steven Whitehouse71f890f2012-07-30 14:53:19 +0100843 RES_RG_HDR + gfs2_rg_blocks(ip, data_blocks + ind_blocks);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100844 if (gfs2_is_jdata(ip))
845 rblocks += data_blocks ? data_blocks : 1;
846
847 error = gfs2_trans_begin(sdp, rblocks,
848 PAGE_CACHE_SIZE/sdp->sd_sb.sb_bsize);
849 if (error)
850 goto out_trans_fail;
851
852 error = fallocate_chunk(inode, offset, max_bytes, mode);
853 gfs2_trans_end(sdp);
854
855 if (error)
856 goto out_trans_fail;
857
858 len -= max_bytes;
859 offset += max_bytes;
860 gfs2_inplace_release(ip);
861 gfs2_quota_unlock(ip);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100862 }
Steven Whitehouse4442f2e2011-11-21 10:01:25 +0000863
864 if (error == 0)
865 error = generic_write_sync(file, pos, count);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100866 goto out_unlock;
867
868out_trans_fail:
869 gfs2_inplace_release(ip);
870out_qunlock:
871 gfs2_quota_unlock(ip);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100872out_unlock:
873 gfs2_glock_dq(&ip->i_gh);
874out_uninit:
875 gfs2_holder_uninit(&ip->i_gh);
876 return error;
877}
878
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000879#ifdef CONFIG_GFS2_FS_LOCKING_DLM
880
David Teiglandb3b94fa2006-01-16 16:50:04 +0000881/**
Marc Eshel60446062007-01-15 18:33:36 -0500882 * gfs2_setlease - acquire/release a file lease
883 * @file: the file pointer
884 * @arg: lease type
885 * @fl: file lock
886 *
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000887 * We don't currently have a way to enforce a lease across the whole
888 * cluster; until we do, disable leases (by just returning -EINVAL),
889 * unless the administrator has requested purely local locking.
890 *
Arnd Bergmannb89f4322010-09-18 15:09:31 +0200891 * Locking: called under lock_flocks
892 *
Marc Eshel60446062007-01-15 18:33:36 -0500893 * Returns: errno
894 */
895
896static int gfs2_setlease(struct file *file, long arg, struct file_lock **fl)
897{
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000898 return -EINVAL;
Steven Whitehouseda755fd2008-01-30 15:34:04 +0000899}
900
Marc Eshel60446062007-01-15 18:33:36 -0500901/**
David Teiglandb3b94fa2006-01-16 16:50:04 +0000902 * gfs2_lock - acquire/release a posix lock on a file
903 * @file: the file pointer
904 * @cmd: either modify or retrieve lock state, possibly wait
905 * @fl: type and range of lock
906 *
907 * Returns: errno
908 */
909
910static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl)
911{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400912 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
913 struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000914 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000915
David Teiglandb3b94fa2006-01-16 16:50:04 +0000916 if (!(fl->fl_flags & FL_POSIX))
917 return -ENOLCK;
Sachin Prabhu720e7742010-03-11 12:24:45 -0500918 if (__mandatory_lock(&ip->i_inode) && fl->fl_type != F_UNLCK)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000919 return -ENOLCK;
920
Marc Eshel586759f2006-11-14 16:37:25 -0500921 if (cmd == F_CANCELLK) {
922 /* Hack: */
923 cmd = F_SETLK;
924 fl->fl_type = F_UNLCK;
925 }
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000926 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
927 return -EIO;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000928 if (IS_GETLK(cmd))
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000929 return dlm_posix_get(ls->ls_dlm, ip->i_no_addr, file, fl);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000930 else if (fl->fl_type == F_UNLCK)
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000931 return dlm_posix_unlock(ls->ls_dlm, ip->i_no_addr, file, fl);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000932 else
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000933 return dlm_posix_lock(ls->ls_dlm, ip->i_no_addr, file, cmd, fl);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000934}
935
David Teiglandb3b94fa2006-01-16 16:50:04 +0000936static int do_flock(struct file *file, int cmd, struct file_lock *fl)
937{
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500938 struct gfs2_file *fp = file->private_data;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000939 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
Al Viro496ad9a2013-01-23 17:07:38 -0500940 struct gfs2_inode *ip = GFS2_I(file_inode(file));
David Teiglandb3b94fa2006-01-16 16:50:04 +0000941 struct gfs2_glock *gl;
942 unsigned int state;
943 int flags;
944 int error = 0;
945
946 state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED;
Steven Whitehouse6802e342008-05-21 17:03:22 +0100947 flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY) | GL_EXACT | GL_NOCACHE;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000948
Steven Whitehousef55ab262006-02-21 12:51:39 +0000949 mutex_lock(&fp->f_fl_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000950
951 gl = fl_gh->gh_gl;
952 if (gl) {
953 if (fl_gh->gh_state == state)
954 goto out;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000955 flock_lock_file_wait(file,
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400956 &(struct file_lock){.fl_type = F_UNLCK});
Abhijith Dasb4c20162007-09-13 23:35:27 -0500957 gfs2_glock_dq_wait(fl_gh);
958 gfs2_holder_reinit(state, flags, fl_gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000959 } else {
Steven Whitehouse6802e342008-05-21 17:03:22 +0100960 error = gfs2_glock_get(GFS2_SB(&ip->i_inode), ip->i_no_addr,
961 &gfs2_flock_glops, CREATE, &gl);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000962 if (error)
963 goto out;
Abhijith Dasb4c20162007-09-13 23:35:27 -0500964 gfs2_holder_init(gl, state, flags, fl_gh);
965 gfs2_glock_put(gl);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000966 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000967 error = gfs2_glock_nq(fl_gh);
968 if (error) {
969 gfs2_holder_uninit(fl_gh);
970 if (error == GLR_TRYFAILED)
971 error = -EAGAIN;
972 } else {
973 error = flock_lock_file_wait(file, fl);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400974 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000975 }
976
Steven Whitehouse420b9e52006-07-31 15:42:17 -0400977out:
Steven Whitehousef55ab262006-02-21 12:51:39 +0000978 mutex_unlock(&fp->f_fl_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000979 return error;
980}
981
982static void do_unflock(struct file *file, struct file_lock *fl)
983{
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500984 struct gfs2_file *fp = file->private_data;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000985 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
986
Steven Whitehousef55ab262006-02-21 12:51:39 +0000987 mutex_lock(&fp->f_fl_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000988 flock_lock_file_wait(file, fl);
Steven Whitehouse0a334432011-03-09 11:14:32 +0000989 if (fl_gh->gh_gl) {
990 gfs2_glock_dq_wait(fl_gh);
991 gfs2_holder_uninit(fl_gh);
992 }
Steven Whitehousef55ab262006-02-21 12:51:39 +0000993 mutex_unlock(&fp->f_fl_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000994}
995
996/**
997 * gfs2_flock - acquire/release a flock lock on a file
998 * @file: the file pointer
999 * @cmd: either modify or retrieve lock state, possibly wait
1000 * @fl: type and range of lock
1001 *
1002 * Returns: errno
1003 */
1004
1005static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl)
1006{
David Teiglandb3b94fa2006-01-16 16:50:04 +00001007 if (!(fl->fl_flags & FL_FLOCK))
1008 return -ENOLCK;
Abhijith Dasa12af1e2009-06-01 12:30:03 -05001009 if (fl->fl_type & LOCK_MAND)
1010 return -EOPNOTSUPP;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001011
David Teiglandb3b94fa2006-01-16 16:50:04 +00001012 if (fl->fl_type == F_UNLCK) {
1013 do_unflock(file, fl);
1014 return 0;
Steven Whitehoused00223f2006-10-02 10:28:05 -04001015 } else {
David Teiglandb3b94fa2006-01-16 16:50:04 +00001016 return do_flock(file, cmd, fl);
Steven Whitehoused00223f2006-10-02 10:28:05 -04001017 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001018}
1019
Christoph Hellwig10d21982009-04-07 19:42:17 +02001020const struct file_operations gfs2_file_fops = {
Steven Whitehouse26c1a572006-09-04 15:32:10 -04001021 .llseek = gfs2_llseek,
Steven Whitehoused00223f2006-10-02 10:28:05 -04001022 .read = do_sync_read,
Steven Whitehouse26c1a572006-09-04 15:32:10 -04001023 .aio_read = generic_file_aio_read,
Steven Whitehoused00223f2006-10-02 10:28:05 -04001024 .write = do_sync_write,
Steven Whitehouse56aa6162009-12-08 10:25:33 +00001025 .aio_write = gfs2_file_aio_write,
Steven Whitehouse26c1a572006-09-04 15:32:10 -04001026 .unlocked_ioctl = gfs2_ioctl,
1027 .mmap = gfs2_mmap,
1028 .open = gfs2_open,
Bob Petersondf3fd112012-04-11 12:56:41 -04001029 .release = gfs2_release,
Steven Whitehouse26c1a572006-09-04 15:32:10 -04001030 .fsync = gfs2_fsync,
1031 .lock = gfs2_lock,
Steven Whitehouse26c1a572006-09-04 15:32:10 -04001032 .flock = gfs2_flock,
1033 .splice_read = generic_file_splice_read,
1034 .splice_write = generic_file_splice_write,
Marc Eshel60446062007-01-15 18:33:36 -05001035 .setlease = gfs2_setlease,
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01001036 .fallocate = gfs2_fallocate,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001037};
1038
Christoph Hellwig10d21982009-04-07 19:42:17 +02001039const struct file_operations gfs2_dir_fops = {
Steven Whitehouse26c1a572006-09-04 15:32:10 -04001040 .readdir = gfs2_readdir,
1041 .unlocked_ioctl = gfs2_ioctl,
1042 .open = gfs2_open,
Bob Petersondf3fd112012-04-11 12:56:41 -04001043 .release = gfs2_release,
Steven Whitehouse26c1a572006-09-04 15:32:10 -04001044 .fsync = gfs2_fsync,
1045 .lock = gfs2_lock,
1046 .flock = gfs2_flock,
Arnd Bergmann6038f372010-08-15 18:52:59 +02001047 .llseek = default_llseek,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001048};
1049
Steven Whitehousef057f6c2009-01-12 10:43:39 +00001050#endif /* CONFIG_GFS2_FS_LOCKING_DLM */
1051
Christoph Hellwig10d21982009-04-07 19:42:17 +02001052const struct file_operations gfs2_file_fops_nolock = {
Wendy Chengc97bfe42007-11-29 17:56:51 -05001053 .llseek = gfs2_llseek,
1054 .read = do_sync_read,
1055 .aio_read = generic_file_aio_read,
1056 .write = do_sync_write,
Steven Whitehouse56aa6162009-12-08 10:25:33 +00001057 .aio_write = gfs2_file_aio_write,
Wendy Chengc97bfe42007-11-29 17:56:51 -05001058 .unlocked_ioctl = gfs2_ioctl,
1059 .mmap = gfs2_mmap,
1060 .open = gfs2_open,
Bob Petersondf3fd112012-04-11 12:56:41 -04001061 .release = gfs2_release,
Wendy Chengc97bfe42007-11-29 17:56:51 -05001062 .fsync = gfs2_fsync,
1063 .splice_read = generic_file_splice_read,
1064 .splice_write = generic_file_splice_write,
Steven Whitehousef057f6c2009-01-12 10:43:39 +00001065 .setlease = generic_setlease,
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01001066 .fallocate = gfs2_fallocate,
Wendy Chengc97bfe42007-11-29 17:56:51 -05001067};
1068
Christoph Hellwig10d21982009-04-07 19:42:17 +02001069const struct file_operations gfs2_dir_fops_nolock = {
Wendy Chengc97bfe42007-11-29 17:56:51 -05001070 .readdir = gfs2_readdir,
1071 .unlocked_ioctl = gfs2_ioctl,
1072 .open = gfs2_open,
Bob Petersondf3fd112012-04-11 12:56:41 -04001073 .release = gfs2_release,
Wendy Chengc97bfe42007-11-29 17:56:51 -05001074 .fsync = gfs2_fsync,
Arnd Bergmann6038f372010-08-15 18:52:59 +02001075 .llseek = default_llseek,
Wendy Chengc97bfe42007-11-29 17:56:51 -05001076};
1077