blob: 5d82e91887e31e4eb139d9b34dd461aec66b63f1 [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>
22#include <linux/crc32.h>
Steven Whitehouse33c3de32006-11-30 10:14:32 -050023#include <linux/writeback.h>
David Teiglandb3b94fa2006-01-16 16:50:04 +000024#include <asm/uaccess.h>
Steven Whitehousef057f6c2009-01-12 10:43:39 +000025#include <linux/dlm.h>
26#include <linux/dlm_plock.h>
David Teiglandb3b94fa2006-01-16 16:50:04 +000027
28#include "gfs2.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050029#include "incore.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000030#include "bmap.h"
31#include "dir.h"
32#include "glock.h"
33#include "glops.h"
34#include "inode.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000035#include "log.h"
36#include "meta_io.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000037#include "quota.h"
38#include "rgrp.h"
39#include "trans.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050040#include "util.h"
Steven Whitehouse71b86f52006-03-28 14:14:04 -050041#include "eaops.h"
Steven Whitehouse55610932007-10-17 08:47:38 +010042#include "ops_address.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
177 flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC);
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000178 if (ip->i_diskflags & GFS2_DIF_IMMUTABLE)
Steven Whitehouse6b124d82006-11-08 12:51:06 -0500179 flags |= S_IMMUTABLE;
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000180 if (ip->i_diskflags & GFS2_DIF_APPENDONLY)
Steven Whitehouse6b124d82006-11-08 12:51:06 -0500181 flags |= S_APPEND;
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000182 if (ip->i_diskflags & GFS2_DIF_NOATIME)
Steven Whitehouse6b124d82006-11-08 12:51:06 -0500183 flags |= S_NOATIME;
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000184 if (ip->i_diskflags & GFS2_DIF_SYNC)
Steven Whitehouse6b124d82006-11-08 12:51:06 -0500185 flags |= S_SYNC;
186 inode->i_flags = flags;
187}
188
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500189/* Flags that can be set by user space */
190#define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA| \
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500191 GFS2_DIF_IMMUTABLE| \
192 GFS2_DIF_APPENDONLY| \
193 GFS2_DIF_NOATIME| \
194 GFS2_DIF_SYNC| \
195 GFS2_DIF_SYSTEM| \
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500196 GFS2_DIF_INHERIT_JDATA)
197
198/**
199 * gfs2_set_flags - set flags on an inode
200 * @inode: The inode
201 * @flags: The flags to set
202 * @mask: Indicates which flags are valid
203 *
204 */
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400205static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask)
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500206{
Josef Sipek81454092006-12-08 02:37:03 -0800207 struct inode *inode = filp->f_path.dentry->d_inode;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400208 struct gfs2_inode *ip = GFS2_I(inode);
209 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500210 struct buffer_head *bh;
211 struct gfs2_holder gh;
212 int error;
Steven Whitehouse55eccc62006-04-04 14:29:30 -0400213 u32 new_flags, flags;
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500214
Miklos Szeredif58ba882008-07-02 21:12:01 +0200215 error = mnt_want_write(filp->f_path.mnt);
Abhijith Das52f341c2006-07-21 02:03:21 -0400216 if (error)
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500217 return error;
218
Miklos Szeredif58ba882008-07-02 21:12:01 +0200219 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
220 if (error)
221 goto out_drop_write;
222
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000223 flags = ip->i_diskflags;
Steven Whitehouse55eccc62006-04-04 14:29:30 -0400224 new_flags = (flags & ~mask) | (reqflags & mask);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500225 if ((new_flags ^ flags) == 0)
226 goto out;
227
228 error = -EINVAL;
229 if ((new_flags ^ flags) & ~GFS2_FLAGS_USER_SET)
230 goto out;
231
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500232 error = -EPERM;
233 if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE))
234 goto out;
235 if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY))
236 goto out;
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400237 if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) &&
Steven Whitehouseb9cb9812006-05-12 17:07:56 -0400238 !capable(CAP_LINUX_IMMUTABLE))
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500239 goto out;
Steven Whitehouseb9cb9812006-05-12 17:07:56 -0400240 if (!IS_IMMUTABLE(inode)) {
Miklos Szeredif58ba882008-07-02 21:12:01 +0200241 error = gfs2_permission(inode, MAY_WRITE);
Steven Whitehouseb9cb9812006-05-12 17:07:56 -0400242 if (error)
243 goto out;
244 }
Steven Whitehouse55610932007-10-17 08:47:38 +0100245 if ((flags ^ new_flags) & GFS2_DIF_JDATA) {
246 if (flags & GFS2_DIF_JDATA)
247 gfs2_log_flush(sdp, ip->i_gl);
248 error = filemap_fdatawrite(inode->i_mapping);
249 if (error)
250 goto out;
251 error = filemap_fdatawait(inode->i_mapping);
252 if (error)
253 goto out;
254 }
Steven Whitehouse55eccc62006-04-04 14:29:30 -0400255 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500256 if (error)
257 goto out;
Steven Whitehouse55eccc62006-04-04 14:29:30 -0400258 error = gfs2_meta_inode_buffer(ip, &bh);
259 if (error)
260 goto out_trans_end;
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500261 gfs2_trans_add_bh(ip->i_gl, bh, 1);
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000262 ip->i_diskflags = new_flags;
Steven Whitehouse539e5d62006-10-31 15:07:05 -0500263 gfs2_dinode_out(ip, bh->b_data);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500264 brelse(bh);
Steven Whitehouse6b124d82006-11-08 12:51:06 -0500265 gfs2_set_inode_flags(inode);
Steven Whitehouse55610932007-10-17 08:47:38 +0100266 gfs2_set_aops(inode);
Steven Whitehouse55eccc62006-04-04 14:29:30 -0400267out_trans_end:
268 gfs2_trans_end(sdp);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500269out:
270 gfs2_glock_dq_uninit(&gh);
Miklos Szeredif58ba882008-07-02 21:12:01 +0200271out_drop_write:
272 mnt_drop_write(filp->f_path.mnt);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500273 return error;
274}
275
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400276static int gfs2_set_flags(struct file *filp, u32 __user *ptr)
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500277{
Steven Whitehouseb9af7ca2007-07-18 11:40:06 +0100278 struct inode *inode = filp->f_path.dentry->d_inode;
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400279 u32 fsflags, gfsflags;
280 if (get_user(fsflags, ptr))
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500281 return -EFAULT;
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400282 gfsflags = fsflags_cvt(fsflags_to_gfs2, fsflags);
Steven Whitehouseb9af7ca2007-07-18 11:40:06 +0100283 if (!S_ISDIR(inode->i_mode)) {
284 if (gfsflags & GFS2_DIF_INHERIT_JDATA)
285 gfsflags ^= (GFS2_DIF_JDATA | GFS2_DIF_INHERIT_JDATA);
Steven Whitehouseb9af7ca2007-07-18 11:40:06 +0100286 return do_gfs2_set_flags(filp, gfsflags, ~0);
287 }
288 return do_gfs2_set_flags(filp, gfsflags, ~GFS2_DIF_JDATA);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500289}
290
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400291static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500292{
293 switch(cmd) {
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400294 case FS_IOC_GETFLAGS:
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400295 return gfs2_get_flags(filp, (u32 __user *)arg);
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400296 case FS_IOC_SETFLAGS:
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400297 return gfs2_set_flags(filp, (u32 __user *)arg);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500298 }
299 return -ENOTTY;
300}
301
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100302/**
303 * gfs2_allocate_page_backing - Use bmap to allocate blocks
304 * @page: The (locked) page to allocate backing for
305 *
306 * We try to allocate all the blocks required for the page in
307 * one go. This might fail for various reasons, so we keep
308 * trying until all the blocks to back this page are allocated.
309 * If some of the blocks are already allocated, thats ok too.
310 */
311
312static int gfs2_allocate_page_backing(struct page *page)
313{
314 struct inode *inode = page->mapping->host;
315 struct buffer_head bh;
316 unsigned long size = PAGE_CACHE_SIZE;
317 u64 lblock = page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
318
319 do {
320 bh.b_state = 0;
321 bh.b_size = size;
Bob Petersone9e1ef22007-12-10 14:13:27 -0600322 gfs2_block_map(inode, lblock, &bh, 1);
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100323 if (!buffer_mapped(&bh))
324 return -EIO;
325 size -= bh.b_size;
326 lblock += (bh.b_size >> inode->i_blkbits);
327 } while(size > 0);
328 return 0;
329}
330
331/**
332 * gfs2_page_mkwrite - Make a shared, mmap()ed, page writable
333 * @vma: The virtual memory area
334 * @page: The page which is about to become writable
335 *
336 * When the page becomes writable, we need to ensure that we have
337 * blocks allocated on disk to back that page.
338 */
339
Nick Pigginc2ec1752009-03-31 15:23:21 -0700340static int gfs2_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100341{
Nick Pigginc2ec1752009-03-31 15:23:21 -0700342 struct page *page = vmf->page;
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100343 struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
344 struct gfs2_inode *ip = GFS2_I(inode);
345 struct gfs2_sbd *sdp = GFS2_SB(inode);
346 unsigned long last_index;
Benjamin Marzinskic8f554b2009-01-06 10:47:50 -0600347 u64 pos = page->index << PAGE_CACHE_SHIFT;
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100348 unsigned int data_blocks, ind_blocks, rblocks;
349 int alloc_required = 0;
350 struct gfs2_holder gh;
351 struct gfs2_alloc *al;
352 int ret;
353
Steven Whitehouse719ee342008-09-18 13:53:59 +0100354 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
355 ret = gfs2_glock_nq(&gh);
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100356 if (ret)
357 goto out;
358
Steven Whitehouse9c538832009-03-19 13:15:44 +0000359 set_bit(GLF_DIRTY, &ip->i_gl->gl_flags);
360 set_bit(GIF_SW_PAGED, &ip->i_flags);
361
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100362 ret = gfs2_write_alloc_required(ip, pos, PAGE_CACHE_SIZE, &alloc_required);
363 if (ret || !alloc_required)
364 goto out_unlock;
Steven Whitehouse6dbd8222008-01-10 15:18:55 +0000365 ret = -ENOMEM;
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100366 al = gfs2_alloc_get(ip);
Steven Whitehouse6dbd8222008-01-10 15:18:55 +0000367 if (al == NULL)
368 goto out_unlock;
369
Steven Whitehoused82661d2008-03-10 15:34:50 +0000370 ret = gfs2_quota_lock_check(ip);
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100371 if (ret)
372 goto out_alloc_put;
Steven Whitehouse7ed122e2008-12-10 10:28:10 +0000373 gfs2_write_calc_reserv(ip, PAGE_CACHE_SIZE, &data_blocks, &ind_blocks);
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100374 al->al_requested = data_blocks + ind_blocks;
375 ret = gfs2_inplace_reserve(ip);
376 if (ret)
377 goto out_quota_unlock;
378
379 rblocks = RES_DINODE + ind_blocks;
380 if (gfs2_is_jdata(ip))
381 rblocks += data_blocks ? data_blocks : 1;
382 if (ind_blocks || data_blocks)
383 rblocks += RES_STATFS + RES_QUOTA;
384 ret = gfs2_trans_begin(sdp, rblocks, 0);
385 if (ret)
386 goto out_trans_fail;
387
388 lock_page(page);
389 ret = -EINVAL;
390 last_index = ip->i_inode.i_size >> PAGE_CACHE_SHIFT;
391 if (page->index > last_index)
392 goto out_unlock_page;
Steven Whitehouseb7fe2e32008-01-17 15:12:03 +0000393 ret = 0;
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100394 if (!PageUptodate(page) || page->mapping != ip->i_inode.i_mapping)
395 goto out_unlock_page;
396 if (gfs2_is_stuffed(ip)) {
397 ret = gfs2_unstuff_dinode(ip, page);
398 if (ret)
399 goto out_unlock_page;
400 }
401 ret = gfs2_allocate_page_backing(page);
402
403out_unlock_page:
404 unlock_page(page);
405 gfs2_trans_end(sdp);
406out_trans_fail:
407 gfs2_inplace_release(ip);
408out_quota_unlock:
409 gfs2_quota_unlock(ip);
410out_alloc_put:
411 gfs2_alloc_put(ip);
412out_unlock:
413 gfs2_glock_dq(&gh);
414out:
415 gfs2_holder_uninit(&gh);
Steven Whitehousee56985d2009-04-20 09:45:54 +0100416 if (ret == -ENOMEM)
417 ret = VM_FAULT_OOM;
418 else if (ret)
Nick Pigginc2ec1752009-03-31 15:23:21 -0700419 ret = VM_FAULT_SIGBUS;
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100420 return ret;
421}
422
423static struct vm_operations_struct gfs2_vm_ops = {
424 .fault = filemap_fault,
425 .page_mkwrite = gfs2_page_mkwrite,
426};
427
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500428
David Teiglandb3b94fa2006-01-16 16:50:04 +0000429/**
430 * gfs2_mmap -
431 * @file: The file to map
432 * @vma: The VMA which described the mapping
433 *
434 * Returns: 0 or error code
435 */
436
437static int gfs2_mmap(struct file *file, struct vm_area_struct *vma)
438{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400439 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000440 struct gfs2_holder i_gh;
441 int error;
442
Steven Whitehouse719ee342008-09-18 13:53:59 +0100443 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &i_gh);
444 error = gfs2_glock_nq(&i_gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000445 if (error) {
446 gfs2_holder_uninit(&i_gh);
447 return error;
448 }
449
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100450 vma->vm_ops = &gfs2_vm_ops;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000451
452 gfs2_glock_dq_uninit(&i_gh);
453
454 return error;
455}
456
457/**
458 * gfs2_open - open a file
459 * @inode: the inode to open
460 * @file: the struct file for this opening
461 *
462 * Returns: errno
463 */
464
465static int gfs2_open(struct inode *inode, struct file *file)
466{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400467 struct gfs2_inode *ip = GFS2_I(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000468 struct gfs2_holder i_gh;
469 struct gfs2_file *fp;
470 int error;
471
David Teiglandb3b94fa2006-01-16 16:50:04 +0000472 fp = kzalloc(sizeof(struct gfs2_file), GFP_KERNEL);
473 if (!fp)
474 return -ENOMEM;
475
Steven Whitehousef55ab262006-02-21 12:51:39 +0000476 mutex_init(&fp->f_fl_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000477
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400478 gfs2_assert_warn(GFS2_SB(inode), !file->private_data);
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500479 file->private_data = fp;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000480
Steven Whitehouseb60623c2006-11-01 12:22:46 -0500481 if (S_ISREG(ip->i_inode.i_mode)) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000482 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
483 &i_gh);
484 if (error)
485 goto fail;
486
487 if (!(file->f_flags & O_LARGEFILE) &&
Steven Whitehousec9e98882008-11-04 09:47:33 +0000488 ip->i_disksize > MAX_NON_LFS) {
Alan Coxa9c62a12007-10-16 23:30:22 -0700489 error = -EOVERFLOW;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000490 goto fail_gunlock;
491 }
492
David Teiglandb3b94fa2006-01-16 16:50:04 +0000493 gfs2_glock_dq_uninit(&i_gh);
494 }
495
496 return 0;
497
Steven Whitehouse420b9e52006-07-31 15:42:17 -0400498fail_gunlock:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000499 gfs2_glock_dq_uninit(&i_gh);
Steven Whitehouse420b9e52006-07-31 15:42:17 -0400500fail:
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500501 file->private_data = NULL;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000502 kfree(fp);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000503 return error;
504}
505
506/**
507 * gfs2_close - called to close a struct file
508 * @inode: the inode the struct file belongs to
509 * @file: the struct file being closed
510 *
511 * Returns: errno
512 */
513
514static int gfs2_close(struct inode *inode, struct file *file)
515{
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500516 struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000517 struct gfs2_file *fp;
518
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500519 fp = file->private_data;
520 file->private_data = NULL;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000521
522 if (gfs2_assert_warn(sdp, fp))
523 return -EIO;
524
525 kfree(fp);
526
527 return 0;
528}
529
530/**
531 * gfs2_fsync - sync the dirty data for a file (across the cluster)
532 * @file: the file that points to the dentry (we ignore this)
533 * @dentry: the dentry that points to the inode to sync
534 *
Steven Whitehouse33c3de32006-11-30 10:14:32 -0500535 * The VFS will flush "normal" data for us. We only need to worry
536 * about metadata here. For journaled data, we just do a log flush
537 * as we can't avoid it. Otherwise we can just bale out if datasync
538 * is set. For stuffed inodes we must flush the log in order to
539 * ensure that all data is on disk.
540 *
Steven Whitehouse34126f92006-12-07 09:13:14 -0500541 * The call to write_inode_now() is there to write back metadata and
542 * the inode itself. It does also try and write the data, but thats
543 * (hopefully) a no-op due to the VFS having already called filemap_fdatawrite()
544 * for us.
545 *
David Teiglandb3b94fa2006-01-16 16:50:04 +0000546 * Returns: errno
547 */
548
549static int gfs2_fsync(struct file *file, struct dentry *dentry, int datasync)
550{
Steven Whitehouse33c3de32006-11-30 10:14:32 -0500551 struct inode *inode = dentry->d_inode;
552 int sync_state = inode->i_state & (I_DIRTY_SYNC|I_DIRTY_DATASYNC);
553 int ret = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000554
Steven Whitehouse33c3de32006-11-30 10:14:32 -0500555 if (gfs2_is_jdata(GFS2_I(inode))) {
556 gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl);
557 return 0;
558 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000559
Steven Whitehouse33c3de32006-11-30 10:14:32 -0500560 if (sync_state != 0) {
561 if (!datasync)
Steven Whitehouse34126f92006-12-07 09:13:14 -0500562 ret = write_inode_now(inode, 0);
Steven Whitehouse33c3de32006-11-30 10:14:32 -0500563
564 if (gfs2_is_stuffed(GFS2_I(inode)))
565 gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl);
566 }
567
568 return ret;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000569}
570
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000571#ifdef CONFIG_GFS2_FS_LOCKING_DLM
572
David Teiglandb3b94fa2006-01-16 16:50:04 +0000573/**
Marc Eshel60446062007-01-15 18:33:36 -0500574 * gfs2_setlease - acquire/release a file lease
575 * @file: the file pointer
576 * @arg: lease type
577 * @fl: file lock
578 *
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000579 * We don't currently have a way to enforce a lease across the whole
580 * cluster; until we do, disable leases (by just returning -EINVAL),
581 * unless the administrator has requested purely local locking.
582 *
Marc Eshel60446062007-01-15 18:33:36 -0500583 * Returns: errno
584 */
585
586static int gfs2_setlease(struct file *file, long arg, struct file_lock **fl)
587{
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000588 return -EINVAL;
Steven Whitehouseda755fd2008-01-30 15:34:04 +0000589}
590
Marc Eshel60446062007-01-15 18:33:36 -0500591/**
David Teiglandb3b94fa2006-01-16 16:50:04 +0000592 * gfs2_lock - acquire/release a posix lock on a file
593 * @file: the file pointer
594 * @cmd: either modify or retrieve lock state, possibly wait
595 * @fl: type and range of lock
596 *
597 * Returns: errno
598 */
599
600static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl)
601{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400602 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
603 struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000604 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000605
David Teiglandb3b94fa2006-01-16 16:50:04 +0000606 if (!(fl->fl_flags & FL_POSIX))
607 return -ENOLCK;
Pavel Emelyanov7afaac62007-10-01 14:41:13 -0700608 if (__mandatory_lock(&ip->i_inode))
David Teiglandb3b94fa2006-01-16 16:50:04 +0000609 return -ENOLCK;
610
Marc Eshel586759f2006-11-14 16:37:25 -0500611 if (cmd == F_CANCELLK) {
612 /* Hack: */
613 cmd = F_SETLK;
614 fl->fl_type = F_UNLCK;
615 }
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000616 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
617 return -EIO;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000618 if (IS_GETLK(cmd))
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000619 return dlm_posix_get(ls->ls_dlm, ip->i_no_addr, file, fl);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000620 else if (fl->fl_type == F_UNLCK)
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000621 return dlm_posix_unlock(ls->ls_dlm, ip->i_no_addr, file, fl);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000622 else
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000623 return dlm_posix_lock(ls->ls_dlm, ip->i_no_addr, file, cmd, fl);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000624}
625
David Teiglandb3b94fa2006-01-16 16:50:04 +0000626static int do_flock(struct file *file, int cmd, struct file_lock *fl)
627{
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500628 struct gfs2_file *fp = file->private_data;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000629 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
Josef Sipek81454092006-12-08 02:37:03 -0800630 struct gfs2_inode *ip = GFS2_I(file->f_path.dentry->d_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000631 struct gfs2_glock *gl;
632 unsigned int state;
633 int flags;
634 int error = 0;
635
636 state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED;
Steven Whitehouse6802e342008-05-21 17:03:22 +0100637 flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY) | GL_EXACT | GL_NOCACHE;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000638
Steven Whitehousef55ab262006-02-21 12:51:39 +0000639 mutex_lock(&fp->f_fl_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000640
641 gl = fl_gh->gh_gl;
642 if (gl) {
643 if (fl_gh->gh_state == state)
644 goto out;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000645 flock_lock_file_wait(file,
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400646 &(struct file_lock){.fl_type = F_UNLCK});
Abhijith Dasb4c20162007-09-13 23:35:27 -0500647 gfs2_glock_dq_wait(fl_gh);
648 gfs2_holder_reinit(state, flags, fl_gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000649 } else {
Steven Whitehouse6802e342008-05-21 17:03:22 +0100650 error = gfs2_glock_get(GFS2_SB(&ip->i_inode), ip->i_no_addr,
651 &gfs2_flock_glops, CREATE, &gl);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000652 if (error)
653 goto out;
Abhijith Dasb4c20162007-09-13 23:35:27 -0500654 gfs2_holder_init(gl, state, flags, fl_gh);
655 gfs2_glock_put(gl);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000656 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000657 error = gfs2_glock_nq(fl_gh);
658 if (error) {
659 gfs2_holder_uninit(fl_gh);
660 if (error == GLR_TRYFAILED)
661 error = -EAGAIN;
662 } else {
663 error = flock_lock_file_wait(file, fl);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400664 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000665 }
666
Steven Whitehouse420b9e52006-07-31 15:42:17 -0400667out:
Steven Whitehousef55ab262006-02-21 12:51:39 +0000668 mutex_unlock(&fp->f_fl_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000669 return error;
670}
671
672static void do_unflock(struct file *file, struct file_lock *fl)
673{
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500674 struct gfs2_file *fp = file->private_data;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000675 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
676
Steven Whitehousef55ab262006-02-21 12:51:39 +0000677 mutex_lock(&fp->f_fl_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000678 flock_lock_file_wait(file, fl);
679 if (fl_gh->gh_gl)
680 gfs2_glock_dq_uninit(fl_gh);
Steven Whitehousef55ab262006-02-21 12:51:39 +0000681 mutex_unlock(&fp->f_fl_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000682}
683
684/**
685 * gfs2_flock - acquire/release a flock lock on a file
686 * @file: the file pointer
687 * @cmd: either modify or retrieve lock state, possibly wait
688 * @fl: type and range of lock
689 *
690 * Returns: errno
691 */
692
693static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl)
694{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400695 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000696
David Teiglandb3b94fa2006-01-16 16:50:04 +0000697 if (!(fl->fl_flags & FL_FLOCK))
698 return -ENOLCK;
Pavel Emelyanov7afaac62007-10-01 14:41:13 -0700699 if (__mandatory_lock(&ip->i_inode))
David Teiglandb3b94fa2006-01-16 16:50:04 +0000700 return -ENOLCK;
701
David Teiglandb3b94fa2006-01-16 16:50:04 +0000702 if (fl->fl_type == F_UNLCK) {
703 do_unflock(file, fl);
704 return 0;
Steven Whitehoused00223f2006-10-02 10:28:05 -0400705 } else {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000706 return do_flock(file, cmd, fl);
Steven Whitehoused00223f2006-10-02 10:28:05 -0400707 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000708}
709
Christoph Hellwig10d21982009-04-07 19:42:17 +0200710const struct file_operations gfs2_file_fops = {
Steven Whitehouse26c1a572006-09-04 15:32:10 -0400711 .llseek = gfs2_llseek,
Steven Whitehoused00223f2006-10-02 10:28:05 -0400712 .read = do_sync_read,
Steven Whitehouse26c1a572006-09-04 15:32:10 -0400713 .aio_read = generic_file_aio_read,
Steven Whitehoused00223f2006-10-02 10:28:05 -0400714 .write = do_sync_write,
Steven Whitehouse26c1a572006-09-04 15:32:10 -0400715 .aio_write = generic_file_aio_write,
716 .unlocked_ioctl = gfs2_ioctl,
717 .mmap = gfs2_mmap,
718 .open = gfs2_open,
719 .release = gfs2_close,
720 .fsync = gfs2_fsync,
721 .lock = gfs2_lock,
Steven Whitehouse26c1a572006-09-04 15:32:10 -0400722 .flock = gfs2_flock,
723 .splice_read = generic_file_splice_read,
724 .splice_write = generic_file_splice_write,
Marc Eshel60446062007-01-15 18:33:36 -0500725 .setlease = gfs2_setlease,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000726};
727
Christoph Hellwig10d21982009-04-07 19:42:17 +0200728const struct file_operations gfs2_dir_fops = {
Steven Whitehouse26c1a572006-09-04 15:32:10 -0400729 .readdir = gfs2_readdir,
730 .unlocked_ioctl = gfs2_ioctl,
731 .open = gfs2_open,
732 .release = gfs2_close,
733 .fsync = gfs2_fsync,
734 .lock = gfs2_lock,
735 .flock = gfs2_flock,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000736};
737
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000738#endif /* CONFIG_GFS2_FS_LOCKING_DLM */
739
Christoph Hellwig10d21982009-04-07 19:42:17 +0200740const struct file_operations gfs2_file_fops_nolock = {
Wendy Chengc97bfe42007-11-29 17:56:51 -0500741 .llseek = gfs2_llseek,
742 .read = do_sync_read,
743 .aio_read = generic_file_aio_read,
744 .write = do_sync_write,
745 .aio_write = generic_file_aio_write,
746 .unlocked_ioctl = gfs2_ioctl,
747 .mmap = gfs2_mmap,
748 .open = gfs2_open,
749 .release = gfs2_close,
750 .fsync = gfs2_fsync,
751 .splice_read = generic_file_splice_read,
752 .splice_write = generic_file_splice_write,
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000753 .setlease = generic_setlease,
Wendy Chengc97bfe42007-11-29 17:56:51 -0500754};
755
Christoph Hellwig10d21982009-04-07 19:42:17 +0200756const struct file_operations gfs2_dir_fops_nolock = {
Wendy Chengc97bfe42007-11-29 17:56:51 -0500757 .readdir = gfs2_readdir,
758 .unlocked_ioctl = gfs2_ioctl,
759 .open = gfs2_open,
760 .release = gfs2_close,
761 .fsync = gfs2_fsync,
762};
763