blob: 92c3db424b40a44a04fc0d4f8e28ef24cd07464e [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>
Steven Whitehouse71b86f52006-03-28 14:14:04 -050021#include <linux/ext2_fs.h>
Christoph Hellwig2fe17c12011-01-14 13:07:43 +010022#include <linux/falloc.h>
23#include <linux/swap.h>
Steven Whitehouse71b86f52006-03-28 14:14:04 -050024#include <linux/crc32.h>
Steven Whitehouse33c3de32006-11-30 10:14:32 -050025#include <linux/writeback.h>
David Teiglandb3b94fa2006-01-16 16:50:04 +000026#include <asm/uaccess.h>
Steven Whitehousef057f6c2009-01-12 10:43:39 +000027#include <linux/dlm.h>
28#include <linux/dlm_plock.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
48 * @origin: Where to seek from (SEEK_SET, SEEK_CUR, or SEEK_END)
49 *
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
56static loff_t gfs2_llseek(struct file *file, loff_t offset, int origin)
57{
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
David Teiglandb3b94fa2006-01-16 16:50:04 +000062 if (origin == 2) {
63 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
64 &i_gh);
65 if (!error) {
Andi Kleen9465efc2008-06-27 11:05:24 +020066 error = generic_file_llseek_unlocked(file, offset, origin);
David Teiglandb3b94fa2006-01-16 16:50:04 +000067 gfs2_glock_dq_uninit(&i_gh);
68 }
69 } else
Andi Kleen9465efc2008-06-27 11:05:24 +020070 error = generic_file_llseek_unlocked(file, offset, origin);
David Teiglandb3b94fa2006-01-16 16:50:04 +000071
72 return error;
73}
74
David Teiglandb3b94fa2006-01-16 16:50:04 +000075/**
Steven Whitehousef0e522a2006-09-19 16:41:11 -040076 * gfs2_readdir - Read directory entries from a directory
David Teiglandb3b94fa2006-01-16 16:50:04 +000077 * @file: The directory to read from
78 * @dirent: Buffer for dirents
79 * @filldir: Function used to do the copying
80 *
81 * Returns: errno
82 */
83
Steven Whitehousef0e522a2006-09-19 16:41:11 -040084static int gfs2_readdir(struct file *file, void *dirent, filldir_t filldir)
David Teiglandb3b94fa2006-01-16 16:50:04 +000085{
Steven Whitehouse71b86f52006-03-28 14:14:04 -050086 struct inode *dir = file->f_mapping->host;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -040087 struct gfs2_inode *dip = GFS2_I(dir);
David Teiglandb3b94fa2006-01-16 16:50:04 +000088 struct gfs2_holder d_gh;
Steven Whitehousecd915492006-09-04 12:49:07 -040089 u64 offset = file->f_pos;
David Teiglandb3b94fa2006-01-16 16:50:04 +000090 int error;
91
Steven Whitehouse719ee342008-09-18 13:53:59 +010092 gfs2_holder_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
93 error = gfs2_glock_nq(&d_gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +000094 if (error) {
95 gfs2_holder_uninit(&d_gh);
96 return error;
97 }
98
Steven Whitehouse3699e3a2007-01-17 15:09:20 +000099 error = gfs2_dir_read(dir, &offset, dirent, filldir);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000100
101 gfs2_glock_dq_uninit(&d_gh);
102
103 file->f_pos = offset;
104
105 return error;
106}
107
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400108/**
109 * fsflags_cvt
110 * @table: A table of 32 u32 flags
111 * @val: a 32 bit value to convert
112 *
113 * This function can be used to convert between fsflags values and
114 * GFS2's own flags values.
115 *
116 * Returns: the converted flags
117 */
118static u32 fsflags_cvt(const u32 *table, u32 val)
119{
120 u32 res = 0;
121 while(val) {
122 if (val & 1)
123 res |= *table;
124 table++;
125 val >>= 1;
126 }
127 return res;
128}
David Teiglandb3b94fa2006-01-16 16:50:04 +0000129
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400130static const u32 fsflags_to_gfs2[32] = {
131 [3] = GFS2_DIF_SYNC,
132 [4] = GFS2_DIF_IMMUTABLE,
133 [5] = GFS2_DIF_APPENDONLY,
134 [7] = GFS2_DIF_NOATIME,
135 [12] = GFS2_DIF_EXHASH,
Steven Whitehouseb9af7ca2007-07-18 11:40:06 +0100136 [14] = GFS2_DIF_INHERIT_JDATA,
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500137};
138
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400139static const u32 gfs2_to_fsflags[32] = {
140 [gfs2fl_Sync] = FS_SYNC_FL,
141 [gfs2fl_Immutable] = FS_IMMUTABLE_FL,
142 [gfs2fl_AppendOnly] = FS_APPEND_FL,
143 [gfs2fl_NoAtime] = FS_NOATIME_FL,
144 [gfs2fl_ExHash] = FS_INDEX_FL,
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400145 [gfs2fl_InheritJdata] = FS_JOURNAL_DATA_FL,
Steven Whitehouse7ea9ea82006-03-31 15:01:28 -0500146};
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500147
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400148static int gfs2_get_flags(struct file *filp, u32 __user *ptr)
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500149{
Josef Sipek81454092006-12-08 02:37:03 -0800150 struct inode *inode = filp->f_path.dentry->d_inode;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400151 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500152 struct gfs2_holder gh;
153 int error;
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400154 u32 fsflags;
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500155
Steven Whitehouse719ee342008-09-18 13:53:59 +0100156 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
157 error = gfs2_glock_nq(&gh);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500158 if (error)
159 return error;
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400160
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000161 fsflags = fsflags_cvt(gfs2_to_fsflags, ip->i_diskflags);
162 if (!S_ISDIR(inode->i_mode) && ip->i_diskflags & GFS2_DIF_JDATA)
Steven Whitehousec9f6a6b2008-07-10 16:09:29 +0100163 fsflags |= FS_JOURNAL_DATA_FL;
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400164 if (put_user(fsflags, ptr))
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500165 error = -EFAULT;
166
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100167 gfs2_glock_dq(&gh);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500168 gfs2_holder_uninit(&gh);
169 return error;
170}
171
Steven Whitehouse6b124d82006-11-08 12:51:06 -0500172void gfs2_set_inode_flags(struct inode *inode)
173{
174 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehouse6b124d82006-11-08 12:51:06 -0500175 unsigned int flags = inode->i_flags;
176
Steven Whitehouse9964afb2011-06-16 14:06:55 +0100177 flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC|S_NOSEC);
178 if ((ip->i_eattr == 0) && !is_sxid(inode->i_mode))
179 inode->i_flags |= S_NOSEC;
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000180 if (ip->i_diskflags & GFS2_DIF_IMMUTABLE)
Steven Whitehouse6b124d82006-11-08 12:51:06 -0500181 flags |= S_IMMUTABLE;
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000182 if (ip->i_diskflags & GFS2_DIF_APPENDONLY)
Steven Whitehouse6b124d82006-11-08 12:51:06 -0500183 flags |= S_APPEND;
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000184 if (ip->i_diskflags & GFS2_DIF_NOATIME)
Steven Whitehouse6b124d82006-11-08 12:51:06 -0500185 flags |= S_NOATIME;
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000186 if (ip->i_diskflags & GFS2_DIF_SYNC)
Steven Whitehouse6b124d82006-11-08 12:51:06 -0500187 flags |= S_SYNC;
188 inode->i_flags = flags;
189}
190
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500191/* Flags that can be set by user space */
192#define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA| \
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500193 GFS2_DIF_IMMUTABLE| \
194 GFS2_DIF_APPENDONLY| \
195 GFS2_DIF_NOATIME| \
196 GFS2_DIF_SYNC| \
197 GFS2_DIF_SYSTEM| \
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500198 GFS2_DIF_INHERIT_JDATA)
199
200/**
201 * gfs2_set_flags - set flags on an inode
202 * @inode: The inode
203 * @flags: The flags to set
204 * @mask: Indicates which flags are valid
205 *
206 */
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400207static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask)
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500208{
Josef Sipek81454092006-12-08 02:37:03 -0800209 struct inode *inode = filp->f_path.dentry->d_inode;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400210 struct gfs2_inode *ip = GFS2_I(inode);
211 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500212 struct buffer_head *bh;
213 struct gfs2_holder gh;
214 int error;
Steven Whitehouse55eccc62006-04-04 14:29:30 -0400215 u32 new_flags, flags;
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500216
Miklos Szeredif58ba882008-07-02 21:12:01 +0200217 error = mnt_want_write(filp->f_path.mnt);
Abhijith Das52f341c2006-07-21 02:03:21 -0400218 if (error)
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500219 return error;
220
Miklos Szeredif58ba882008-07-02 21:12:01 +0200221 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
222 if (error)
223 goto out_drop_write;
224
Steven Whitehouse7df0e032010-05-24 14:36:48 +0100225 error = -EACCES;
Serge E. Hallyn2e149672011-03-23 16:43:26 -0700226 if (!inode_owner_or_capable(inode))
Steven Whitehouse7df0e032010-05-24 14:36:48 +0100227 goto out;
228
229 error = 0;
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000230 flags = ip->i_diskflags;
Steven Whitehouse55eccc62006-04-04 14:29:30 -0400231 new_flags = (flags & ~mask) | (reqflags & mask);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500232 if ((new_flags ^ flags) == 0)
233 goto out;
234
235 error = -EINVAL;
236 if ((new_flags ^ flags) & ~GFS2_FLAGS_USER_SET)
237 goto out;
238
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500239 error = -EPERM;
240 if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE))
241 goto out;
242 if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY))
243 goto out;
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400244 if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) &&
Steven Whitehouseb9cb9812006-05-12 17:07:56 -0400245 !capable(CAP_LINUX_IMMUTABLE))
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500246 goto out;
Steven Whitehouseb9cb9812006-05-12 17:07:56 -0400247 if (!IS_IMMUTABLE(inode)) {
Al Viro10556cb2011-06-20 19:28:19 -0400248 error = gfs2_permission(inode, MAY_WRITE);
Steven Whitehouseb9cb9812006-05-12 17:07:56 -0400249 if (error)
250 goto out;
251 }
Steven Whitehouse55610932007-10-17 08:47:38 +0100252 if ((flags ^ new_flags) & GFS2_DIF_JDATA) {
253 if (flags & GFS2_DIF_JDATA)
254 gfs2_log_flush(sdp, ip->i_gl);
255 error = filemap_fdatawrite(inode->i_mapping);
256 if (error)
257 goto out;
258 error = filemap_fdatawait(inode->i_mapping);
259 if (error)
260 goto out;
261 }
Steven Whitehouse55eccc62006-04-04 14:29:30 -0400262 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500263 if (error)
264 goto out;
Steven Whitehouse55eccc62006-04-04 14:29:30 -0400265 error = gfs2_meta_inode_buffer(ip, &bh);
266 if (error)
267 goto out_trans_end;
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500268 gfs2_trans_add_bh(ip->i_gl, bh, 1);
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000269 ip->i_diskflags = new_flags;
Steven Whitehouse539e5d62006-10-31 15:07:05 -0500270 gfs2_dinode_out(ip, bh->b_data);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500271 brelse(bh);
Steven Whitehouse6b124d82006-11-08 12:51:06 -0500272 gfs2_set_inode_flags(inode);
Steven Whitehouse55610932007-10-17 08:47:38 +0100273 gfs2_set_aops(inode);
Steven Whitehouse55eccc62006-04-04 14:29:30 -0400274out_trans_end:
275 gfs2_trans_end(sdp);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500276out:
277 gfs2_glock_dq_uninit(&gh);
Miklos Szeredif58ba882008-07-02 21:12:01 +0200278out_drop_write:
279 mnt_drop_write(filp->f_path.mnt);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500280 return error;
281}
282
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400283static int gfs2_set_flags(struct file *filp, u32 __user *ptr)
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500284{
Steven Whitehouseb9af7ca2007-07-18 11:40:06 +0100285 struct inode *inode = filp->f_path.dentry->d_inode;
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400286 u32 fsflags, gfsflags;
Steven Whitehouse7df0e032010-05-24 14:36:48 +0100287
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400288 if (get_user(fsflags, ptr))
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500289 return -EFAULT;
Steven Whitehouse7df0e032010-05-24 14:36:48 +0100290
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400291 gfsflags = fsflags_cvt(fsflags_to_gfs2, fsflags);
Steven Whitehouseb9af7ca2007-07-18 11:40:06 +0100292 if (!S_ISDIR(inode->i_mode)) {
293 if (gfsflags & GFS2_DIF_INHERIT_JDATA)
294 gfsflags ^= (GFS2_DIF_JDATA | GFS2_DIF_INHERIT_JDATA);
Steven Whitehouseb9af7ca2007-07-18 11:40:06 +0100295 return do_gfs2_set_flags(filp, gfsflags, ~0);
296 }
297 return do_gfs2_set_flags(filp, gfsflags, ~GFS2_DIF_JDATA);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500298}
299
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400300static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500301{
302 switch(cmd) {
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400303 case FS_IOC_GETFLAGS:
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400304 return gfs2_get_flags(filp, (u32 __user *)arg);
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400305 case FS_IOC_SETFLAGS:
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400306 return gfs2_set_flags(filp, (u32 __user *)arg);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500307 }
308 return -ENOTTY;
309}
310
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100311/**
312 * gfs2_allocate_page_backing - Use bmap to allocate blocks
313 * @page: The (locked) page to allocate backing for
314 *
315 * We try to allocate all the blocks required for the page in
316 * one go. This might fail for various reasons, so we keep
317 * trying until all the blocks to back this page are allocated.
318 * If some of the blocks are already allocated, thats ok too.
319 */
320
321static int gfs2_allocate_page_backing(struct page *page)
322{
323 struct inode *inode = page->mapping->host;
324 struct buffer_head bh;
325 unsigned long size = PAGE_CACHE_SIZE;
326 u64 lblock = page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
327
328 do {
329 bh.b_state = 0;
330 bh.b_size = size;
Bob Petersone9e1ef22007-12-10 14:13:27 -0600331 gfs2_block_map(inode, lblock, &bh, 1);
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100332 if (!buffer_mapped(&bh))
333 return -EIO;
334 size -= bh.b_size;
335 lblock += (bh.b_size >> inode->i_blkbits);
336 } while(size > 0);
337 return 0;
338}
339
340/**
341 * gfs2_page_mkwrite - Make a shared, mmap()ed, page writable
342 * @vma: The virtual memory area
343 * @page: The page which is about to become writable
344 *
345 * When the page becomes writable, we need to ensure that we have
346 * blocks allocated on disk to back that page.
347 */
348
Nick Pigginc2ec1752009-03-31 15:23:21 -0700349static int gfs2_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100350{
Nick Pigginc2ec1752009-03-31 15:23:21 -0700351 struct page *page = vmf->page;
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100352 struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
353 struct gfs2_inode *ip = GFS2_I(inode);
354 struct gfs2_sbd *sdp = GFS2_SB(inode);
355 unsigned long last_index;
Benjamin Marzinskic8f554b2009-01-06 10:47:50 -0600356 u64 pos = page->index << PAGE_CACHE_SHIFT;
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100357 unsigned int data_blocks, ind_blocks, rblocks;
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100358 struct gfs2_holder gh;
359 struct gfs2_alloc *al;
360 int ret;
361
Steven Whitehouse719ee342008-09-18 13:53:59 +0100362 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
363 ret = gfs2_glock_nq(&gh);
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100364 if (ret)
365 goto out;
366
Steven Whitehouse9c538832009-03-19 13:15:44 +0000367 set_bit(GLF_DIRTY, &ip->i_gl->gl_flags);
368 set_bit(GIF_SW_PAGED, &ip->i_flags);
369
Bob Peterson461cb412010-06-24 19:21:20 -0400370 if (!gfs2_write_alloc_required(ip, pos, PAGE_CACHE_SIZE))
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100371 goto out_unlock;
Steven Whitehouse6dbd8222008-01-10 15:18:55 +0000372 ret = -ENOMEM;
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100373 al = gfs2_alloc_get(ip);
Steven Whitehouse6dbd8222008-01-10 15:18:55 +0000374 if (al == NULL)
375 goto out_unlock;
376
Steven Whitehoused82661d2008-03-10 15:34:50 +0000377 ret = gfs2_quota_lock_check(ip);
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100378 if (ret)
379 goto out_alloc_put;
Steven Whitehouse7ed122e2008-12-10 10:28:10 +0000380 gfs2_write_calc_reserv(ip, PAGE_CACHE_SIZE, &data_blocks, &ind_blocks);
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100381 al->al_requested = data_blocks + ind_blocks;
382 ret = gfs2_inplace_reserve(ip);
383 if (ret)
384 goto out_quota_unlock;
385
386 rblocks = RES_DINODE + ind_blocks;
387 if (gfs2_is_jdata(ip))
388 rblocks += data_blocks ? data_blocks : 1;
Benjamin Marzinskibf97b672010-09-27 16:00:04 -0500389 if (ind_blocks || data_blocks) {
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100390 rblocks += RES_STATFS + RES_QUOTA;
Benjamin Marzinskibf97b672010-09-27 16:00:04 -0500391 rblocks += gfs2_rg_blocks(al);
392 }
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100393 ret = gfs2_trans_begin(sdp, rblocks, 0);
394 if (ret)
395 goto out_trans_fail;
396
397 lock_page(page);
398 ret = -EINVAL;
399 last_index = ip->i_inode.i_size >> PAGE_CACHE_SHIFT;
400 if (page->index > last_index)
401 goto out_unlock_page;
Steven Whitehouseb7fe2e32008-01-17 15:12:03 +0000402 ret = 0;
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100403 if (!PageUptodate(page) || page->mapping != ip->i_inode.i_mapping)
404 goto out_unlock_page;
405 if (gfs2_is_stuffed(ip)) {
406 ret = gfs2_unstuff_dinode(ip, page);
407 if (ret)
408 goto out_unlock_page;
409 }
410 ret = gfs2_allocate_page_backing(page);
411
412out_unlock_page:
413 unlock_page(page);
414 gfs2_trans_end(sdp);
415out_trans_fail:
416 gfs2_inplace_release(ip);
417out_quota_unlock:
418 gfs2_quota_unlock(ip);
419out_alloc_put:
420 gfs2_alloc_put(ip);
421out_unlock:
422 gfs2_glock_dq(&gh);
423out:
424 gfs2_holder_uninit(&gh);
Steven Whitehousee56985d2009-04-20 09:45:54 +0100425 if (ret == -ENOMEM)
426 ret = VM_FAULT_OOM;
427 else if (ret)
Nick Pigginc2ec1752009-03-31 15:23:21 -0700428 ret = VM_FAULT_SIGBUS;
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100429 return ret;
430}
431
Alexey Dobriyanf0f37e2f2009-09-27 22:29:37 +0400432static const struct vm_operations_struct gfs2_vm_ops = {
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100433 .fault = filemap_fault,
434 .page_mkwrite = gfs2_page_mkwrite,
435};
436
David Teiglandb3b94fa2006-01-16 16:50:04 +0000437/**
438 * gfs2_mmap -
439 * @file: The file to map
440 * @vma: The VMA which described the mapping
441 *
Steven Whitehouse48bf2b12009-04-29 13:59:35 +0100442 * There is no need to get a lock here unless we should be updating
443 * atime. We ignore any locking errors since the only consequence is
444 * a missed atime update (which will just be deferred until later).
445 *
446 * Returns: 0
David Teiglandb3b94fa2006-01-16 16:50:04 +0000447 */
448
449static int gfs2_mmap(struct file *file, struct vm_area_struct *vma)
450{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400451 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000452
Steven Whitehouseb9c93bb2011-02-02 14:48:10 +0000453 if (!(file->f_flags & O_NOATIME) &&
454 !IS_NOATIME(&ip->i_inode)) {
Steven Whitehouse48bf2b12009-04-29 13:59:35 +0100455 struct gfs2_holder i_gh;
456 int error;
457
Steven Whitehouseb9c93bb2011-02-02 14:48:10 +0000458 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
Steven Whitehouse48bf2b12009-04-29 13:59:35 +0100459 error = gfs2_glock_nq(&i_gh);
Steven Whitehouseb9c93bb2011-02-02 14:48:10 +0000460 if (error == 0) {
461 file_accessed(file);
462 gfs2_glock_dq(&i_gh);
463 }
464 gfs2_holder_uninit(&i_gh);
465 if (error)
466 return error;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000467 }
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100468 vma->vm_ops = &gfs2_vm_ops;
Steven Whitehouse48bf2b12009-04-29 13:59:35 +0100469 vma->vm_flags |= VM_CAN_NONLINEAR;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000470
Steven Whitehouse48bf2b12009-04-29 13:59:35 +0100471 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000472}
473
474/**
475 * gfs2_open - open a file
476 * @inode: the inode to open
477 * @file: the struct file for this opening
478 *
479 * Returns: errno
480 */
481
482static int gfs2_open(struct inode *inode, struct file *file)
483{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400484 struct gfs2_inode *ip = GFS2_I(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000485 struct gfs2_holder i_gh;
486 struct gfs2_file *fp;
487 int error;
488
David Teiglandb3b94fa2006-01-16 16:50:04 +0000489 fp = kzalloc(sizeof(struct gfs2_file), GFP_KERNEL);
490 if (!fp)
491 return -ENOMEM;
492
Steven Whitehousef55ab262006-02-21 12:51:39 +0000493 mutex_init(&fp->f_fl_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000494
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400495 gfs2_assert_warn(GFS2_SB(inode), !file->private_data);
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500496 file->private_data = fp;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000497
Steven Whitehouseb60623c2006-11-01 12:22:46 -0500498 if (S_ISREG(ip->i_inode.i_mode)) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000499 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
500 &i_gh);
501 if (error)
502 goto fail;
503
504 if (!(file->f_flags & O_LARGEFILE) &&
Steven Whitehousea2e0f792010-08-11 09:53:11 +0100505 i_size_read(inode) > MAX_NON_LFS) {
Alan Coxa9c62a12007-10-16 23:30:22 -0700506 error = -EOVERFLOW;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000507 goto fail_gunlock;
508 }
509
David Teiglandb3b94fa2006-01-16 16:50:04 +0000510 gfs2_glock_dq_uninit(&i_gh);
511 }
512
513 return 0;
514
Steven Whitehouse420b9e52006-07-31 15:42:17 -0400515fail_gunlock:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000516 gfs2_glock_dq_uninit(&i_gh);
Steven Whitehouse420b9e52006-07-31 15:42:17 -0400517fail:
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500518 file->private_data = NULL;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000519 kfree(fp);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000520 return error;
521}
522
523/**
524 * gfs2_close - called to close a struct file
525 * @inode: the inode the struct file belongs to
526 * @file: the struct file being closed
527 *
528 * Returns: errno
529 */
530
531static int gfs2_close(struct inode *inode, struct file *file)
532{
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500533 struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000534 struct gfs2_file *fp;
535
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500536 fp = file->private_data;
537 file->private_data = NULL;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000538
539 if (gfs2_assert_warn(sdp, fp))
540 return -EIO;
541
542 kfree(fp);
543
544 return 0;
545}
546
547/**
548 * gfs2_fsync - sync the dirty data for a file (across the cluster)
Josef Bacik02c24a82011-07-16 20:44:56 -0400549 * @file: the file that points to the dentry
550 * @start: the start position in the file to sync
551 * @end: the end position in the file to sync
Steven Whitehousedba898b2011-04-14 09:54:02 +0100552 * @datasync: set if we can ignore timestamp changes
David Teiglandb3b94fa2006-01-16 16:50:04 +0000553 *
Steven Whitehouse2f0264d2011-07-27 10:58:48 +0100554 * We split the data flushing here so that we don't wait for the data
555 * until after we've also sent the metadata to disk. Note that for
556 * data=ordered, we will write & wait for the data at the log flush
557 * stage anyway, so this is unlikely to make much of a difference
558 * except in the data=writeback case.
559 *
560 * If the fdatawrite fails due to any reason except -EIO, we will
561 * continue the remainder of the fsync, although we'll still report
562 * the error at the end. This is to match filemap_write_and_wait_range()
563 * behaviour.
Steven Whitehouse34126f92006-12-07 09:13:14 -0500564 *
David Teiglandb3b94fa2006-01-16 16:50:04 +0000565 * Returns: errno
566 */
567
Josef Bacik02c24a82011-07-16 20:44:56 -0400568static int gfs2_fsync(struct file *file, loff_t start, loff_t end,
569 int datasync)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000570{
Steven Whitehouse2f0264d2011-07-27 10:58:48 +0100571 struct address_space *mapping = file->f_mapping;
572 struct inode *inode = mapping->host;
Steven Whitehouse33c3de32006-11-30 10:14:32 -0500573 int sync_state = inode->i_state & (I_DIRTY_SYNC|I_DIRTY_DATASYNC);
Steven Whitehousedba898b2011-04-14 09:54:02 +0100574 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehouse2f0264d2011-07-27 10:58:48 +0100575 int ret, ret1 = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000576
Steven Whitehouse2f0264d2011-07-27 10:58:48 +0100577 if (mapping->nrpages) {
578 ret1 = filemap_fdatawrite_range(mapping, start, end);
579 if (ret1 == -EIO)
580 return ret1;
581 }
Josef Bacik02c24a82011-07-16 20:44:56 -0400582
Steven Whitehousedba898b2011-04-14 09:54:02 +0100583 if (datasync)
584 sync_state &= ~I_DIRTY_SYNC;
585
586 if (sync_state) {
Steven Whitehouse2f0264d2011-07-27 10:58:48 +0100587 mutex_lock(&inode->i_mutex);
Steven Whitehousedba898b2011-04-14 09:54:02 +0100588 ret = sync_inode_metadata(inode, 1);
Josef Bacik02c24a82011-07-16 20:44:56 -0400589 if (ret) {
590 mutex_unlock(&inode->i_mutex);
Steven Whitehousedba898b2011-04-14 09:54:02 +0100591 return ret;
Josef Bacik02c24a82011-07-16 20:44:56 -0400592 }
Steven Whitehousedba898b2011-04-14 09:54:02 +0100593 gfs2_ail_flush(ip->i_gl);
Steven Whitehouse2f0264d2011-07-27 10:58:48 +0100594 mutex_unlock(&inode->i_mutex);
Steven Whitehouse33c3de32006-11-30 10:14:32 -0500595 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000596
Steven Whitehouse2f0264d2011-07-27 10:58:48 +0100597 if (mapping->nrpages)
598 ret = filemap_fdatawait_range(mapping, start, end);
599
600 return ret ? ret : ret1;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000601}
602
Steven Whitehouse56aa6162009-12-08 10:25:33 +0000603/**
604 * gfs2_file_aio_write - Perform a write to a file
605 * @iocb: The io context
606 * @iov: The data to write
607 * @nr_segs: Number of @iov segments
608 * @pos: The file position
609 *
610 * We have to do a lock/unlock here to refresh the inode size for
611 * O_APPEND writes, otherwise we can land up writing at the wrong
612 * offset. There is still a race, but provided the app is using its
613 * own file locking, this will make O_APPEND work as expected.
614 *
615 */
616
617static ssize_t gfs2_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
618 unsigned long nr_segs, loff_t pos)
619{
620 struct file *file = iocb->ki_filp;
621
622 if (file->f_flags & O_APPEND) {
623 struct dentry *dentry = file->f_dentry;
624 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
625 struct gfs2_holder gh;
626 int ret;
627
628 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
629 if (ret)
630 return ret;
631 gfs2_glock_dq_uninit(&gh);
632 }
633
634 return generic_file_aio_write(iocb, iov, nr_segs, pos);
635}
636
Benjamin Marzinski0ee53202011-03-17 21:54:46 -0500637static int empty_write_end(struct page *page, unsigned from,
638 unsigned to, int mode)
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100639{
Benjamin Marzinski0ee53202011-03-17 21:54:46 -0500640 struct inode *inode = page->mapping->host;
641 struct gfs2_inode *ip = GFS2_I(inode);
642 struct buffer_head *bh;
643 unsigned offset, blksize = 1 << inode->i_blkbits;
644 pgoff_t end_index = i_size_read(inode) >> PAGE_CACHE_SHIFT;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100645
Benjamin Marzinskie4a7b7b2011-03-11 00:49:09 -0600646 zero_user(page, from, to-from);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100647 mark_page_accessed(page);
648
Benjamin Marzinski0ee53202011-03-17 21:54:46 -0500649 if (page->index < end_index || !(mode & FALLOC_FL_KEEP_SIZE)) {
650 if (!gfs2_is_writeback(ip))
651 gfs2_page_add_databufs(ip, page, from, to);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100652
Benjamin Marzinski0ee53202011-03-17 21:54:46 -0500653 block_commit_write(page, from, to);
654 return 0;
655 }
656
657 offset = 0;
658 bh = page_buffers(page);
659 while (offset < to) {
660 if (offset >= from) {
661 set_buffer_uptodate(bh);
662 mark_buffer_dirty(bh);
663 clear_buffer_new(bh);
664 write_dirty_buffer(bh, WRITE);
665 }
666 offset += blksize;
667 bh = bh->b_this_page;
668 }
669
670 offset = 0;
671 bh = page_buffers(page);
672 while (offset < to) {
673 if (offset >= from) {
674 wait_on_buffer(bh);
675 if (!buffer_uptodate(bh))
676 return -EIO;
677 }
678 offset += blksize;
679 bh = bh->b_this_page;
680 }
681 return 0;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100682}
683
Benjamin Marzinskie4a7b7b2011-03-11 00:49:09 -0600684static int needs_empty_write(sector_t block, struct inode *inode)
685{
686 int error;
687 struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
688
689 bh_map.b_size = 1 << inode->i_blkbits;
690 error = gfs2_block_map(inode, block, &bh_map, 0);
691 if (unlikely(error))
692 return error;
693 return !buffer_mapped(&bh_map);
694}
695
Benjamin Marzinski0ee53202011-03-17 21:54:46 -0500696static int write_empty_blocks(struct page *page, unsigned from, unsigned to,
697 int mode)
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100698{
Benjamin Marzinskie4a7b7b2011-03-11 00:49:09 -0600699 struct inode *inode = page->mapping->host;
700 unsigned start, end, next, blksize;
701 sector_t block = page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
702 int ret;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100703
Benjamin Marzinskie4a7b7b2011-03-11 00:49:09 -0600704 blksize = 1 << inode->i_blkbits;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100705 next = end = 0;
706 while (next < from) {
Benjamin Marzinskie4a7b7b2011-03-11 00:49:09 -0600707 next += blksize;
708 block++;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100709 }
710 start = next;
711 do {
Benjamin Marzinskie4a7b7b2011-03-11 00:49:09 -0600712 next += blksize;
713 ret = needs_empty_write(block, inode);
714 if (unlikely(ret < 0))
715 return ret;
716 if (ret == 0) {
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100717 if (end) {
Benjamin Marzinskie4a7b7b2011-03-11 00:49:09 -0600718 ret = __block_write_begin(page, start, end - start,
719 gfs2_block_map);
720 if (unlikely(ret))
721 return ret;
Benjamin Marzinski0ee53202011-03-17 21:54:46 -0500722 ret = empty_write_end(page, start, end, mode);
723 if (unlikely(ret))
724 return ret;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100725 end = 0;
726 }
727 start = next;
728 }
729 else
730 end = next;
Benjamin Marzinskie4a7b7b2011-03-11 00:49:09 -0600731 block++;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100732 } while (next < to);
733
734 if (end) {
Benjamin Marzinskie4a7b7b2011-03-11 00:49:09 -0600735 ret = __block_write_begin(page, start, end - start, gfs2_block_map);
736 if (unlikely(ret))
737 return ret;
Benjamin Marzinski0ee53202011-03-17 21:54:46 -0500738 ret = empty_write_end(page, start, end, mode);
739 if (unlikely(ret))
740 return ret;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100741 }
742
743 return 0;
744}
745
746static int fallocate_chunk(struct inode *inode, loff_t offset, loff_t len,
747 int mode)
748{
749 struct gfs2_inode *ip = GFS2_I(inode);
750 struct buffer_head *dibh;
751 int error;
752 u64 start = offset >> PAGE_CACHE_SHIFT;
753 unsigned int start_offset = offset & ~PAGE_CACHE_MASK;
754 u64 end = (offset + len - 1) >> PAGE_CACHE_SHIFT;
755 pgoff_t curr;
756 struct page *page;
757 unsigned int end_offset = (offset + len) & ~PAGE_CACHE_MASK;
758 unsigned int from, to;
759
760 if (!end_offset)
761 end_offset = PAGE_CACHE_SIZE;
762
763 error = gfs2_meta_inode_buffer(ip, &dibh);
764 if (unlikely(error))
765 goto out;
766
767 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
768
769 if (gfs2_is_stuffed(ip)) {
770 error = gfs2_unstuff_dinode(ip, NULL);
771 if (unlikely(error))
772 goto out;
773 }
774
775 curr = start;
776 offset = start << PAGE_CACHE_SHIFT;
777 from = start_offset;
778 to = PAGE_CACHE_SIZE;
779 while (curr <= end) {
780 page = grab_cache_page_write_begin(inode->i_mapping, curr,
781 AOP_FLAG_NOFS);
782 if (unlikely(!page)) {
783 error = -ENOMEM;
784 goto out;
785 }
786
787 if (curr == end)
788 to = end_offset;
Benjamin Marzinski0ee53202011-03-17 21:54:46 -0500789 error = write_empty_blocks(page, from, to, mode);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100790 if (!error && offset + to > inode->i_size &&
791 !(mode & FALLOC_FL_KEEP_SIZE)) {
792 i_size_write(inode, offset + to);
793 }
794 unlock_page(page);
795 page_cache_release(page);
796 if (error)
797 goto out;
798 curr++;
799 offset += PAGE_CACHE_SIZE;
800 from = 0;
801 }
802
803 gfs2_dinode_out(ip, dibh->b_data);
804 mark_inode_dirty(inode);
805
806 brelse(dibh);
807
808out:
809 return error;
810}
811
812static void calc_max_reserv(struct gfs2_inode *ip, loff_t max, loff_t *len,
813 unsigned int *data_blocks, unsigned int *ind_blocks)
814{
815 const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
816 unsigned int max_blocks = ip->i_alloc->al_rgd->rd_free_clone;
817 unsigned int tmp, max_data = max_blocks - 3 * (sdp->sd_max_height - 1);
818
819 for (tmp = max_data; tmp > sdp->sd_diptrs;) {
820 tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs);
821 max_data -= tmp;
822 }
823 /* This calculation isn't the exact reverse of gfs2_write_calc_reserve,
824 so it might end up with fewer data blocks */
825 if (max_data <= *data_blocks)
826 return;
827 *data_blocks = max_data;
828 *ind_blocks = max_blocks - max_data;
829 *len = ((loff_t)max_data - 3) << sdp->sd_sb.sb_bsize_shift;
830 if (*len > max) {
831 *len = max;
832 gfs2_write_calc_reserv(ip, max, data_blocks, ind_blocks);
833 }
834}
835
836static long gfs2_fallocate(struct file *file, int mode, loff_t offset,
837 loff_t len)
838{
839 struct inode *inode = file->f_path.dentry->d_inode;
840 struct gfs2_sbd *sdp = GFS2_SB(inode);
841 struct gfs2_inode *ip = GFS2_I(inode);
842 unsigned int data_blocks = 0, ind_blocks = 0, rblocks;
843 loff_t bytes, max_bytes;
844 struct gfs2_alloc *al;
845 int error;
Benjamin Marzinski6905d9e2011-04-26 01:13:24 -0500846 loff_t bsize_mask = ~((loff_t)sdp->sd_sb.sb_bsize - 1);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100847 loff_t next = (offset + len - 1) >> sdp->sd_sb.sb_bsize_shift;
848 next = (next + 1) << sdp->sd_sb.sb_bsize_shift;
849
850 /* We only support the FALLOC_FL_KEEP_SIZE mode */
851 if (mode & ~FALLOC_FL_KEEP_SIZE)
852 return -EOPNOTSUPP;
853
Benjamin Marzinski6905d9e2011-04-26 01:13:24 -0500854 offset &= bsize_mask;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100855
856 len = next - offset;
857 bytes = sdp->sd_max_rg_data * sdp->sd_sb.sb_bsize / 2;
858 if (!bytes)
859 bytes = UINT_MAX;
Benjamin Marzinski6905d9e2011-04-26 01:13:24 -0500860 bytes &= bsize_mask;
861 if (bytes == 0)
862 bytes = sdp->sd_sb.sb_bsize;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100863
864 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &ip->i_gh);
865 error = gfs2_glock_nq(&ip->i_gh);
866 if (unlikely(error))
867 goto out_uninit;
868
869 if (!gfs2_write_alloc_required(ip, offset, len))
870 goto out_unlock;
871
872 while (len > 0) {
873 if (len < bytes)
874 bytes = len;
875 al = gfs2_alloc_get(ip);
876 if (!al) {
877 error = -ENOMEM;
878 goto out_unlock;
879 }
880
881 error = gfs2_quota_lock_check(ip);
882 if (error)
883 goto out_alloc_put;
884
885retry:
886 gfs2_write_calc_reserv(ip, bytes, &data_blocks, &ind_blocks);
887
888 al->al_requested = data_blocks + ind_blocks;
889 error = gfs2_inplace_reserve(ip);
890 if (error) {
891 if (error == -ENOSPC && bytes > sdp->sd_sb.sb_bsize) {
892 bytes >>= 1;
Benjamin Marzinski6905d9e2011-04-26 01:13:24 -0500893 bytes &= bsize_mask;
894 if (bytes == 0)
895 bytes = sdp->sd_sb.sb_bsize;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100896 goto retry;
897 }
898 goto out_qunlock;
899 }
900 max_bytes = bytes;
901 calc_max_reserv(ip, len, &max_bytes, &data_blocks, &ind_blocks);
902 al->al_requested = data_blocks + ind_blocks;
903
904 rblocks = RES_DINODE + ind_blocks + RES_STATFS + RES_QUOTA +
905 RES_RG_HDR + gfs2_rg_blocks(al);
906 if (gfs2_is_jdata(ip))
907 rblocks += data_blocks ? data_blocks : 1;
908
909 error = gfs2_trans_begin(sdp, rblocks,
910 PAGE_CACHE_SIZE/sdp->sd_sb.sb_bsize);
911 if (error)
912 goto out_trans_fail;
913
914 error = fallocate_chunk(inode, offset, max_bytes, mode);
915 gfs2_trans_end(sdp);
916
917 if (error)
918 goto out_trans_fail;
919
920 len -= max_bytes;
921 offset += max_bytes;
922 gfs2_inplace_release(ip);
923 gfs2_quota_unlock(ip);
924 gfs2_alloc_put(ip);
925 }
926 goto out_unlock;
927
928out_trans_fail:
929 gfs2_inplace_release(ip);
930out_qunlock:
931 gfs2_quota_unlock(ip);
932out_alloc_put:
933 gfs2_alloc_put(ip);
934out_unlock:
935 gfs2_glock_dq(&ip->i_gh);
936out_uninit:
937 gfs2_holder_uninit(&ip->i_gh);
938 return error;
939}
940
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000941#ifdef CONFIG_GFS2_FS_LOCKING_DLM
942
David Teiglandb3b94fa2006-01-16 16:50:04 +0000943/**
Marc Eshel60446062007-01-15 18:33:36 -0500944 * gfs2_setlease - acquire/release a file lease
945 * @file: the file pointer
946 * @arg: lease type
947 * @fl: file lock
948 *
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000949 * We don't currently have a way to enforce a lease across the whole
950 * cluster; until we do, disable leases (by just returning -EINVAL),
951 * unless the administrator has requested purely local locking.
952 *
Arnd Bergmannb89f4322010-09-18 15:09:31 +0200953 * Locking: called under lock_flocks
954 *
Marc Eshel60446062007-01-15 18:33:36 -0500955 * Returns: errno
956 */
957
958static int gfs2_setlease(struct file *file, long arg, struct file_lock **fl)
959{
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000960 return -EINVAL;
Steven Whitehouseda755fd2008-01-30 15:34:04 +0000961}
962
Marc Eshel60446062007-01-15 18:33:36 -0500963/**
David Teiglandb3b94fa2006-01-16 16:50:04 +0000964 * gfs2_lock - acquire/release a posix lock on a file
965 * @file: the file pointer
966 * @cmd: either modify or retrieve lock state, possibly wait
967 * @fl: type and range of lock
968 *
969 * Returns: errno
970 */
971
972static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl)
973{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400974 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
975 struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000976 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000977
David Teiglandb3b94fa2006-01-16 16:50:04 +0000978 if (!(fl->fl_flags & FL_POSIX))
979 return -ENOLCK;
Sachin Prabhu720e7742010-03-11 12:24:45 -0500980 if (__mandatory_lock(&ip->i_inode) && fl->fl_type != F_UNLCK)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000981 return -ENOLCK;
982
Marc Eshel586759f2006-11-14 16:37:25 -0500983 if (cmd == F_CANCELLK) {
984 /* Hack: */
985 cmd = F_SETLK;
986 fl->fl_type = F_UNLCK;
987 }
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000988 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
989 return -EIO;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000990 if (IS_GETLK(cmd))
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000991 return dlm_posix_get(ls->ls_dlm, ip->i_no_addr, file, fl);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000992 else if (fl->fl_type == F_UNLCK)
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000993 return dlm_posix_unlock(ls->ls_dlm, ip->i_no_addr, file, fl);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000994 else
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000995 return dlm_posix_lock(ls->ls_dlm, ip->i_no_addr, file, cmd, fl);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000996}
997
David Teiglandb3b94fa2006-01-16 16:50:04 +0000998static int do_flock(struct file *file, int cmd, struct file_lock *fl)
999{
Steven Whitehouse5c676f62006-02-27 17:23:27 -05001000 struct gfs2_file *fp = file->private_data;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001001 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
Josef Sipek81454092006-12-08 02:37:03 -08001002 struct gfs2_inode *ip = GFS2_I(file->f_path.dentry->d_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001003 struct gfs2_glock *gl;
1004 unsigned int state;
1005 int flags;
1006 int error = 0;
1007
1008 state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED;
Steven Whitehouse6802e342008-05-21 17:03:22 +01001009 flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY) | GL_EXACT | GL_NOCACHE;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001010
Steven Whitehousef55ab262006-02-21 12:51:39 +00001011 mutex_lock(&fp->f_fl_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001012
1013 gl = fl_gh->gh_gl;
1014 if (gl) {
1015 if (fl_gh->gh_state == state)
1016 goto out;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001017 flock_lock_file_wait(file,
Steven Whitehouse907b9bc2006-09-25 09:26:04 -04001018 &(struct file_lock){.fl_type = F_UNLCK});
Abhijith Dasb4c20162007-09-13 23:35:27 -05001019 gfs2_glock_dq_wait(fl_gh);
1020 gfs2_holder_reinit(state, flags, fl_gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001021 } else {
Steven Whitehouse6802e342008-05-21 17:03:22 +01001022 error = gfs2_glock_get(GFS2_SB(&ip->i_inode), ip->i_no_addr,
1023 &gfs2_flock_glops, CREATE, &gl);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001024 if (error)
1025 goto out;
Abhijith Dasb4c20162007-09-13 23:35:27 -05001026 gfs2_holder_init(gl, state, flags, fl_gh);
1027 gfs2_glock_put(gl);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001028 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001029 error = gfs2_glock_nq(fl_gh);
1030 if (error) {
1031 gfs2_holder_uninit(fl_gh);
1032 if (error == GLR_TRYFAILED)
1033 error = -EAGAIN;
1034 } else {
1035 error = flock_lock_file_wait(file, fl);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001036 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001037 }
1038
Steven Whitehouse420b9e52006-07-31 15:42:17 -04001039out:
Steven Whitehousef55ab262006-02-21 12:51:39 +00001040 mutex_unlock(&fp->f_fl_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001041 return error;
1042}
1043
1044static void do_unflock(struct file *file, struct file_lock *fl)
1045{
Steven Whitehouse5c676f62006-02-27 17:23:27 -05001046 struct gfs2_file *fp = file->private_data;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001047 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
1048
Steven Whitehousef55ab262006-02-21 12:51:39 +00001049 mutex_lock(&fp->f_fl_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001050 flock_lock_file_wait(file, fl);
Steven Whitehouse0a334432011-03-09 11:14:32 +00001051 if (fl_gh->gh_gl) {
1052 gfs2_glock_dq_wait(fl_gh);
1053 gfs2_holder_uninit(fl_gh);
1054 }
Steven Whitehousef55ab262006-02-21 12:51:39 +00001055 mutex_unlock(&fp->f_fl_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001056}
1057
1058/**
1059 * gfs2_flock - acquire/release a flock lock on a file
1060 * @file: the file pointer
1061 * @cmd: either modify or retrieve lock state, possibly wait
1062 * @fl: type and range of lock
1063 *
1064 * Returns: errno
1065 */
1066
1067static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl)
1068{
David Teiglandb3b94fa2006-01-16 16:50:04 +00001069 if (!(fl->fl_flags & FL_FLOCK))
1070 return -ENOLCK;
Abhijith Dasa12af1e2009-06-01 12:30:03 -05001071 if (fl->fl_type & LOCK_MAND)
1072 return -EOPNOTSUPP;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001073
David Teiglandb3b94fa2006-01-16 16:50:04 +00001074 if (fl->fl_type == F_UNLCK) {
1075 do_unflock(file, fl);
1076 return 0;
Steven Whitehoused00223f2006-10-02 10:28:05 -04001077 } else {
David Teiglandb3b94fa2006-01-16 16:50:04 +00001078 return do_flock(file, cmd, fl);
Steven Whitehoused00223f2006-10-02 10:28:05 -04001079 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001080}
1081
Christoph Hellwig10d21982009-04-07 19:42:17 +02001082const struct file_operations gfs2_file_fops = {
Steven Whitehouse26c1a572006-09-04 15:32:10 -04001083 .llseek = gfs2_llseek,
Steven Whitehoused00223f2006-10-02 10:28:05 -04001084 .read = do_sync_read,
Steven Whitehouse26c1a572006-09-04 15:32:10 -04001085 .aio_read = generic_file_aio_read,
Steven Whitehoused00223f2006-10-02 10:28:05 -04001086 .write = do_sync_write,
Steven Whitehouse56aa6162009-12-08 10:25:33 +00001087 .aio_write = gfs2_file_aio_write,
Steven Whitehouse26c1a572006-09-04 15:32:10 -04001088 .unlocked_ioctl = gfs2_ioctl,
1089 .mmap = gfs2_mmap,
1090 .open = gfs2_open,
1091 .release = gfs2_close,
1092 .fsync = gfs2_fsync,
1093 .lock = gfs2_lock,
Steven Whitehouse26c1a572006-09-04 15:32:10 -04001094 .flock = gfs2_flock,
1095 .splice_read = generic_file_splice_read,
1096 .splice_write = generic_file_splice_write,
Marc Eshel60446062007-01-15 18:33:36 -05001097 .setlease = gfs2_setlease,
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01001098 .fallocate = gfs2_fallocate,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001099};
1100
Christoph Hellwig10d21982009-04-07 19:42:17 +02001101const struct file_operations gfs2_dir_fops = {
Steven Whitehouse26c1a572006-09-04 15:32:10 -04001102 .readdir = gfs2_readdir,
1103 .unlocked_ioctl = gfs2_ioctl,
1104 .open = gfs2_open,
1105 .release = gfs2_close,
1106 .fsync = gfs2_fsync,
1107 .lock = gfs2_lock,
1108 .flock = gfs2_flock,
Arnd Bergmann6038f372010-08-15 18:52:59 +02001109 .llseek = default_llseek,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001110};
1111
Steven Whitehousef057f6c2009-01-12 10:43:39 +00001112#endif /* CONFIG_GFS2_FS_LOCKING_DLM */
1113
Christoph Hellwig10d21982009-04-07 19:42:17 +02001114const struct file_operations gfs2_file_fops_nolock = {
Wendy Chengc97bfe42007-11-29 17:56:51 -05001115 .llseek = gfs2_llseek,
1116 .read = do_sync_read,
1117 .aio_read = generic_file_aio_read,
1118 .write = do_sync_write,
Steven Whitehouse56aa6162009-12-08 10:25:33 +00001119 .aio_write = gfs2_file_aio_write,
Wendy Chengc97bfe42007-11-29 17:56:51 -05001120 .unlocked_ioctl = gfs2_ioctl,
1121 .mmap = gfs2_mmap,
1122 .open = gfs2_open,
1123 .release = gfs2_close,
1124 .fsync = gfs2_fsync,
1125 .splice_read = generic_file_splice_read,
1126 .splice_write = generic_file_splice_write,
Steven Whitehousef057f6c2009-01-12 10:43:39 +00001127 .setlease = generic_setlease,
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01001128 .fallocate = gfs2_fallocate,
Wendy Chengc97bfe42007-11-29 17:56:51 -05001129};
1130
Christoph Hellwig10d21982009-04-07 19:42:17 +02001131const struct file_operations gfs2_dir_fops_nolock = {
Wendy Chengc97bfe42007-11-29 17:56:51 -05001132 .readdir = gfs2_readdir,
1133 .unlocked_ioctl = gfs2_ioctl,
1134 .open = gfs2_open,
1135 .release = gfs2_close,
1136 .fsync = gfs2_fsync,
Arnd Bergmann6038f372010-08-15 18:52:59 +02001137 .llseek = default_llseek,
Wendy Chengc97bfe42007-11-29 17:56:51 -05001138};
1139