blob: ed9a94f0ef159c369b6bd3a3598e1cd4d42fb697 [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"
David Teiglandb3b94fa2006-01-16 16:50:04 +000041
David Teiglandb3b94fa2006-01-16 16:50:04 +000042/**
43 * gfs2_llseek - seek to a location in a file
44 * @file: the file
45 * @offset: the offset
46 * @origin: Where to seek from (SEEK_SET, SEEK_CUR, or SEEK_END)
47 *
48 * SEEK_END requires the glock for the file because it references the
49 * file's size.
50 *
51 * Returns: The new offset, or errno
52 */
53
54static loff_t gfs2_llseek(struct file *file, loff_t offset, int origin)
55{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -040056 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
David Teiglandb3b94fa2006-01-16 16:50:04 +000057 struct gfs2_holder i_gh;
58 loff_t error;
59
David Teiglandb3b94fa2006-01-16 16:50:04 +000060 if (origin == 2) {
61 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
62 &i_gh);
63 if (!error) {
Andi Kleen9465efc2008-06-27 11:05:24 +020064 error = generic_file_llseek_unlocked(file, offset, origin);
David Teiglandb3b94fa2006-01-16 16:50:04 +000065 gfs2_glock_dq_uninit(&i_gh);
66 }
67 } else
Andi Kleen9465efc2008-06-27 11:05:24 +020068 error = generic_file_llseek_unlocked(file, offset, origin);
David Teiglandb3b94fa2006-01-16 16:50:04 +000069
70 return error;
71}
72
David Teiglandb3b94fa2006-01-16 16:50:04 +000073/**
Steven Whitehousef0e522a2006-09-19 16:41:11 -040074 * gfs2_readdir - Read directory entries from a directory
David Teiglandb3b94fa2006-01-16 16:50:04 +000075 * @file: The directory to read from
76 * @dirent: Buffer for dirents
77 * @filldir: Function used to do the copying
78 *
79 * Returns: errno
80 */
81
Steven Whitehousef0e522a2006-09-19 16:41:11 -040082static int gfs2_readdir(struct file *file, void *dirent, filldir_t filldir)
David Teiglandb3b94fa2006-01-16 16:50:04 +000083{
Steven Whitehouse71b86f52006-03-28 14:14:04 -050084 struct inode *dir = file->f_mapping->host;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -040085 struct gfs2_inode *dip = GFS2_I(dir);
David Teiglandb3b94fa2006-01-16 16:50:04 +000086 struct gfs2_holder d_gh;
Steven Whitehousecd915492006-09-04 12:49:07 -040087 u64 offset = file->f_pos;
David Teiglandb3b94fa2006-01-16 16:50:04 +000088 int error;
89
Steven Whitehouse719ee342008-09-18 13:53:59 +010090 gfs2_holder_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
91 error = gfs2_glock_nq(&d_gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +000092 if (error) {
93 gfs2_holder_uninit(&d_gh);
94 return error;
95 }
96
Steven Whitehouse3699e3a2007-01-17 15:09:20 +000097 error = gfs2_dir_read(dir, &offset, dirent, filldir);
David Teiglandb3b94fa2006-01-16 16:50:04 +000098
99 gfs2_glock_dq_uninit(&d_gh);
100
101 file->f_pos = offset;
102
103 return error;
104}
105
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400106/**
107 * fsflags_cvt
108 * @table: A table of 32 u32 flags
109 * @val: a 32 bit value to convert
110 *
111 * This function can be used to convert between fsflags values and
112 * GFS2's own flags values.
113 *
114 * Returns: the converted flags
115 */
116static u32 fsflags_cvt(const u32 *table, u32 val)
117{
118 u32 res = 0;
119 while(val) {
120 if (val & 1)
121 res |= *table;
122 table++;
123 val >>= 1;
124 }
125 return res;
126}
David Teiglandb3b94fa2006-01-16 16:50:04 +0000127
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400128static const u32 fsflags_to_gfs2[32] = {
129 [3] = GFS2_DIF_SYNC,
130 [4] = GFS2_DIF_IMMUTABLE,
131 [5] = GFS2_DIF_APPENDONLY,
132 [7] = GFS2_DIF_NOATIME,
133 [12] = GFS2_DIF_EXHASH,
Steven Whitehouseb9af7ca2007-07-18 11:40:06 +0100134 [14] = GFS2_DIF_INHERIT_JDATA,
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500135};
136
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400137static const u32 gfs2_to_fsflags[32] = {
138 [gfs2fl_Sync] = FS_SYNC_FL,
139 [gfs2fl_Immutable] = FS_IMMUTABLE_FL,
140 [gfs2fl_AppendOnly] = FS_APPEND_FL,
141 [gfs2fl_NoAtime] = FS_NOATIME_FL,
142 [gfs2fl_ExHash] = FS_INDEX_FL,
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400143 [gfs2fl_InheritJdata] = FS_JOURNAL_DATA_FL,
Steven Whitehouse7ea9ea82006-03-31 15:01:28 -0500144};
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500145
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400146static int gfs2_get_flags(struct file *filp, u32 __user *ptr)
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500147{
Josef Sipek81454092006-12-08 02:37:03 -0800148 struct inode *inode = filp->f_path.dentry->d_inode;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400149 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500150 struct gfs2_holder gh;
151 int error;
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400152 u32 fsflags;
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500153
Steven Whitehouse719ee342008-09-18 13:53:59 +0100154 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
155 error = gfs2_glock_nq(&gh);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500156 if (error)
157 return error;
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400158
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000159 fsflags = fsflags_cvt(gfs2_to_fsflags, ip->i_diskflags);
160 if (!S_ISDIR(inode->i_mode) && ip->i_diskflags & GFS2_DIF_JDATA)
Steven Whitehousec9f6a6b2008-07-10 16:09:29 +0100161 fsflags |= FS_JOURNAL_DATA_FL;
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400162 if (put_user(fsflags, ptr))
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500163 error = -EFAULT;
164
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100165 gfs2_glock_dq(&gh);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500166 gfs2_holder_uninit(&gh);
167 return error;
168}
169
Steven Whitehouse6b124d82006-11-08 12:51:06 -0500170void gfs2_set_inode_flags(struct inode *inode)
171{
172 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehouse6b124d82006-11-08 12:51:06 -0500173 unsigned int flags = inode->i_flags;
174
175 flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC);
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000176 if (ip->i_diskflags & GFS2_DIF_IMMUTABLE)
Steven Whitehouse6b124d82006-11-08 12:51:06 -0500177 flags |= S_IMMUTABLE;
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000178 if (ip->i_diskflags & GFS2_DIF_APPENDONLY)
Steven Whitehouse6b124d82006-11-08 12:51:06 -0500179 flags |= S_APPEND;
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000180 if (ip->i_diskflags & GFS2_DIF_NOATIME)
Steven Whitehouse6b124d82006-11-08 12:51:06 -0500181 flags |= S_NOATIME;
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000182 if (ip->i_diskflags & GFS2_DIF_SYNC)
Steven Whitehouse6b124d82006-11-08 12:51:06 -0500183 flags |= S_SYNC;
184 inode->i_flags = flags;
185}
186
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500187/* Flags that can be set by user space */
188#define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA| \
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500189 GFS2_DIF_IMMUTABLE| \
190 GFS2_DIF_APPENDONLY| \
191 GFS2_DIF_NOATIME| \
192 GFS2_DIF_SYNC| \
193 GFS2_DIF_SYSTEM| \
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500194 GFS2_DIF_INHERIT_JDATA)
195
196/**
197 * gfs2_set_flags - set flags on an inode
198 * @inode: The inode
199 * @flags: The flags to set
200 * @mask: Indicates which flags are valid
201 *
202 */
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400203static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask)
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500204{
Josef Sipek81454092006-12-08 02:37:03 -0800205 struct inode *inode = filp->f_path.dentry->d_inode;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400206 struct gfs2_inode *ip = GFS2_I(inode);
207 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500208 struct buffer_head *bh;
209 struct gfs2_holder gh;
210 int error;
Steven Whitehouse55eccc62006-04-04 14:29:30 -0400211 u32 new_flags, flags;
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500212
Miklos Szeredif58ba882008-07-02 21:12:01 +0200213 error = mnt_want_write(filp->f_path.mnt);
Abhijith Das52f341c2006-07-21 02:03:21 -0400214 if (error)
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500215 return error;
216
Miklos Szeredif58ba882008-07-02 21:12:01 +0200217 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
218 if (error)
219 goto out_drop_write;
220
Steven Whitehouse7df0e032010-05-24 14:36:48 +0100221 error = -EACCES;
222 if (!is_owner_or_cap(inode))
223 goto out;
224
225 error = 0;
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000226 flags = ip->i_diskflags;
Steven Whitehouse55eccc62006-04-04 14:29:30 -0400227 new_flags = (flags & ~mask) | (reqflags & mask);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500228 if ((new_flags ^ flags) == 0)
229 goto out;
230
231 error = -EINVAL;
232 if ((new_flags ^ flags) & ~GFS2_FLAGS_USER_SET)
233 goto out;
234
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500235 error = -EPERM;
236 if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE))
237 goto out;
238 if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY))
239 goto out;
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400240 if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) &&
Steven Whitehouseb9cb9812006-05-12 17:07:56 -0400241 !capable(CAP_LINUX_IMMUTABLE))
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500242 goto out;
Steven Whitehouseb9cb9812006-05-12 17:07:56 -0400243 if (!IS_IMMUTABLE(inode)) {
Miklos Szeredif58ba882008-07-02 21:12:01 +0200244 error = gfs2_permission(inode, MAY_WRITE);
Steven Whitehouseb9cb9812006-05-12 17:07:56 -0400245 if (error)
246 goto out;
247 }
Steven Whitehouse55610932007-10-17 08:47:38 +0100248 if ((flags ^ new_flags) & GFS2_DIF_JDATA) {
249 if (flags & GFS2_DIF_JDATA)
250 gfs2_log_flush(sdp, ip->i_gl);
251 error = filemap_fdatawrite(inode->i_mapping);
252 if (error)
253 goto out;
254 error = filemap_fdatawait(inode->i_mapping);
255 if (error)
256 goto out;
257 }
Steven Whitehouse55eccc62006-04-04 14:29:30 -0400258 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500259 if (error)
260 goto out;
Steven Whitehouse55eccc62006-04-04 14:29:30 -0400261 error = gfs2_meta_inode_buffer(ip, &bh);
262 if (error)
263 goto out_trans_end;
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500264 gfs2_trans_add_bh(ip->i_gl, bh, 1);
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000265 ip->i_diskflags = new_flags;
Steven Whitehouse539e5d62006-10-31 15:07:05 -0500266 gfs2_dinode_out(ip, bh->b_data);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500267 brelse(bh);
Steven Whitehouse6b124d82006-11-08 12:51:06 -0500268 gfs2_set_inode_flags(inode);
Steven Whitehouse55610932007-10-17 08:47:38 +0100269 gfs2_set_aops(inode);
Steven Whitehouse55eccc62006-04-04 14:29:30 -0400270out_trans_end:
271 gfs2_trans_end(sdp);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500272out:
273 gfs2_glock_dq_uninit(&gh);
Miklos Szeredif58ba882008-07-02 21:12:01 +0200274out_drop_write:
275 mnt_drop_write(filp->f_path.mnt);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500276 return error;
277}
278
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400279static int gfs2_set_flags(struct file *filp, u32 __user *ptr)
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500280{
Steven Whitehouseb9af7ca2007-07-18 11:40:06 +0100281 struct inode *inode = filp->f_path.dentry->d_inode;
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400282 u32 fsflags, gfsflags;
Steven Whitehouse7df0e032010-05-24 14:36:48 +0100283
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400284 if (get_user(fsflags, ptr))
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500285 return -EFAULT;
Steven Whitehouse7df0e032010-05-24 14:36:48 +0100286
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400287 gfsflags = fsflags_cvt(fsflags_to_gfs2, fsflags);
Steven Whitehouseb9af7ca2007-07-18 11:40:06 +0100288 if (!S_ISDIR(inode->i_mode)) {
289 if (gfsflags & GFS2_DIF_INHERIT_JDATA)
290 gfsflags ^= (GFS2_DIF_JDATA | GFS2_DIF_INHERIT_JDATA);
Steven Whitehouseb9af7ca2007-07-18 11:40:06 +0100291 return do_gfs2_set_flags(filp, gfsflags, ~0);
292 }
293 return do_gfs2_set_flags(filp, gfsflags, ~GFS2_DIF_JDATA);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500294}
295
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400296static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500297{
298 switch(cmd) {
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400299 case FS_IOC_GETFLAGS:
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400300 return gfs2_get_flags(filp, (u32 __user *)arg);
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400301 case FS_IOC_SETFLAGS:
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400302 return gfs2_set_flags(filp, (u32 __user *)arg);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500303 }
304 return -ENOTTY;
305}
306
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100307/**
308 * gfs2_allocate_page_backing - Use bmap to allocate blocks
309 * @page: The (locked) page to allocate backing for
310 *
311 * We try to allocate all the blocks required for the page in
312 * one go. This might fail for various reasons, so we keep
313 * trying until all the blocks to back this page are allocated.
314 * If some of the blocks are already allocated, thats ok too.
315 */
316
317static int gfs2_allocate_page_backing(struct page *page)
318{
319 struct inode *inode = page->mapping->host;
320 struct buffer_head bh;
321 unsigned long size = PAGE_CACHE_SIZE;
322 u64 lblock = page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
323
324 do {
325 bh.b_state = 0;
326 bh.b_size = size;
Bob Petersone9e1ef22007-12-10 14:13:27 -0600327 gfs2_block_map(inode, lblock, &bh, 1);
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100328 if (!buffer_mapped(&bh))
329 return -EIO;
330 size -= bh.b_size;
331 lblock += (bh.b_size >> inode->i_blkbits);
332 } while(size > 0);
333 return 0;
334}
335
336/**
337 * gfs2_page_mkwrite - Make a shared, mmap()ed, page writable
338 * @vma: The virtual memory area
339 * @page: The page which is about to become writable
340 *
341 * When the page becomes writable, we need to ensure that we have
342 * blocks allocated on disk to back that page.
343 */
344
Nick Pigginc2ec1752009-03-31 15:23:21 -0700345static int gfs2_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100346{
Nick Pigginc2ec1752009-03-31 15:23:21 -0700347 struct page *page = vmf->page;
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100348 struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
349 struct gfs2_inode *ip = GFS2_I(inode);
350 struct gfs2_sbd *sdp = GFS2_SB(inode);
351 unsigned long last_index;
Benjamin Marzinskic8f554b2009-01-06 10:47:50 -0600352 u64 pos = page->index << PAGE_CACHE_SHIFT;
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100353 unsigned int data_blocks, ind_blocks, rblocks;
354 int alloc_required = 0;
355 struct gfs2_holder gh;
356 struct gfs2_alloc *al;
357 int ret;
358
Steven Whitehouse719ee342008-09-18 13:53:59 +0100359 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
360 ret = gfs2_glock_nq(&gh);
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100361 if (ret)
362 goto out;
363
Steven Whitehouse9c538832009-03-19 13:15:44 +0000364 set_bit(GLF_DIRTY, &ip->i_gl->gl_flags);
365 set_bit(GIF_SW_PAGED, &ip->i_flags);
366
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100367 ret = gfs2_write_alloc_required(ip, pos, PAGE_CACHE_SIZE, &alloc_required);
368 if (ret || !alloc_required)
369 goto out_unlock;
Steven Whitehouse6dbd8222008-01-10 15:18:55 +0000370 ret = -ENOMEM;
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100371 al = gfs2_alloc_get(ip);
Steven Whitehouse6dbd8222008-01-10 15:18:55 +0000372 if (al == NULL)
373 goto out_unlock;
374
Steven Whitehoused82661d2008-03-10 15:34:50 +0000375 ret = gfs2_quota_lock_check(ip);
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100376 if (ret)
377 goto out_alloc_put;
Steven Whitehouse7ed122e2008-12-10 10:28:10 +0000378 gfs2_write_calc_reserv(ip, PAGE_CACHE_SIZE, &data_blocks, &ind_blocks);
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100379 al->al_requested = data_blocks + ind_blocks;
380 ret = gfs2_inplace_reserve(ip);
381 if (ret)
382 goto out_quota_unlock;
383
384 rblocks = RES_DINODE + ind_blocks;
385 if (gfs2_is_jdata(ip))
386 rblocks += data_blocks ? data_blocks : 1;
387 if (ind_blocks || data_blocks)
388 rblocks += RES_STATFS + RES_QUOTA;
389 ret = gfs2_trans_begin(sdp, rblocks, 0);
390 if (ret)
391 goto out_trans_fail;
392
393 lock_page(page);
394 ret = -EINVAL;
395 last_index = ip->i_inode.i_size >> PAGE_CACHE_SHIFT;
396 if (page->index > last_index)
397 goto out_unlock_page;
Steven Whitehouseb7fe2e32008-01-17 15:12:03 +0000398 ret = 0;
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100399 if (!PageUptodate(page) || page->mapping != ip->i_inode.i_mapping)
400 goto out_unlock_page;
401 if (gfs2_is_stuffed(ip)) {
402 ret = gfs2_unstuff_dinode(ip, page);
403 if (ret)
404 goto out_unlock_page;
405 }
406 ret = gfs2_allocate_page_backing(page);
407
408out_unlock_page:
409 unlock_page(page);
410 gfs2_trans_end(sdp);
411out_trans_fail:
412 gfs2_inplace_release(ip);
413out_quota_unlock:
414 gfs2_quota_unlock(ip);
415out_alloc_put:
416 gfs2_alloc_put(ip);
417out_unlock:
418 gfs2_glock_dq(&gh);
419out:
420 gfs2_holder_uninit(&gh);
Steven Whitehousee56985d2009-04-20 09:45:54 +0100421 if (ret == -ENOMEM)
422 ret = VM_FAULT_OOM;
423 else if (ret)
Nick Pigginc2ec1752009-03-31 15:23:21 -0700424 ret = VM_FAULT_SIGBUS;
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100425 return ret;
426}
427
Alexey Dobriyanf0f37e22009-09-27 22:29:37 +0400428static const struct vm_operations_struct gfs2_vm_ops = {
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100429 .fault = filemap_fault,
430 .page_mkwrite = gfs2_page_mkwrite,
431};
432
David Teiglandb3b94fa2006-01-16 16:50:04 +0000433/**
434 * gfs2_mmap -
435 * @file: The file to map
436 * @vma: The VMA which described the mapping
437 *
Steven Whitehouse48bf2b12009-04-29 13:59:35 +0100438 * There is no need to get a lock here unless we should be updating
439 * atime. We ignore any locking errors since the only consequence is
440 * a missed atime update (which will just be deferred until later).
441 *
442 * Returns: 0
David Teiglandb3b94fa2006-01-16 16:50:04 +0000443 */
444
445static int gfs2_mmap(struct file *file, struct vm_area_struct *vma)
446{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400447 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000448
Steven Whitehouse48bf2b12009-04-29 13:59:35 +0100449 if (!(file->f_flags & O_NOATIME)) {
450 struct gfs2_holder i_gh;
451 int error;
452
453 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &i_gh);
454 error = gfs2_glock_nq(&i_gh);
455 file_accessed(file);
456 if (error == 0)
457 gfs2_glock_dq_uninit(&i_gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000458 }
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100459 vma->vm_ops = &gfs2_vm_ops;
Steven Whitehouse48bf2b12009-04-29 13:59:35 +0100460 vma->vm_flags |= VM_CAN_NONLINEAR;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000461
Steven Whitehouse48bf2b12009-04-29 13:59:35 +0100462 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000463}
464
465/**
466 * gfs2_open - open a file
467 * @inode: the inode to open
468 * @file: the struct file for this opening
469 *
470 * Returns: errno
471 */
472
473static int gfs2_open(struct inode *inode, struct file *file)
474{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400475 struct gfs2_inode *ip = GFS2_I(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000476 struct gfs2_holder i_gh;
477 struct gfs2_file *fp;
478 int error;
479
David Teiglandb3b94fa2006-01-16 16:50:04 +0000480 fp = kzalloc(sizeof(struct gfs2_file), GFP_KERNEL);
481 if (!fp)
482 return -ENOMEM;
483
Steven Whitehousef55ab262006-02-21 12:51:39 +0000484 mutex_init(&fp->f_fl_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000485
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400486 gfs2_assert_warn(GFS2_SB(inode), !file->private_data);
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500487 file->private_data = fp;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000488
Steven Whitehouseb60623c2006-11-01 12:22:46 -0500489 if (S_ISREG(ip->i_inode.i_mode)) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000490 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
491 &i_gh);
492 if (error)
493 goto fail;
494
495 if (!(file->f_flags & O_LARGEFILE) &&
Steven Whitehousec9e98882008-11-04 09:47:33 +0000496 ip->i_disksize > MAX_NON_LFS) {
Alan Coxa9c62a12007-10-16 23:30:22 -0700497 error = -EOVERFLOW;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000498 goto fail_gunlock;
499 }
500
David Teiglandb3b94fa2006-01-16 16:50:04 +0000501 gfs2_glock_dq_uninit(&i_gh);
502 }
503
504 return 0;
505
Steven Whitehouse420b9e52006-07-31 15:42:17 -0400506fail_gunlock:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000507 gfs2_glock_dq_uninit(&i_gh);
Steven Whitehouse420b9e52006-07-31 15:42:17 -0400508fail:
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500509 file->private_data = NULL;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000510 kfree(fp);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000511 return error;
512}
513
514/**
515 * gfs2_close - called to close a struct file
516 * @inode: the inode the struct file belongs to
517 * @file: the struct file being closed
518 *
519 * Returns: errno
520 */
521
522static int gfs2_close(struct inode *inode, struct file *file)
523{
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500524 struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000525 struct gfs2_file *fp;
526
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500527 fp = file->private_data;
528 file->private_data = NULL;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000529
530 if (gfs2_assert_warn(sdp, fp))
531 return -EIO;
532
533 kfree(fp);
534
535 return 0;
536}
537
538/**
539 * gfs2_fsync - sync the dirty data for a file (across the cluster)
540 * @file: the file that points to the dentry (we ignore this)
541 * @dentry: the dentry that points to the inode to sync
542 *
Steven Whitehouse33c3de32006-11-30 10:14:32 -0500543 * The VFS will flush "normal" data for us. We only need to worry
544 * about metadata here. For journaled data, we just do a log flush
545 * as we can't avoid it. Otherwise we can just bale out if datasync
546 * is set. For stuffed inodes we must flush the log in order to
547 * ensure that all data is on disk.
548 *
Steven Whitehouse34126f92006-12-07 09:13:14 -0500549 * The call to write_inode_now() is there to write back metadata and
550 * the inode itself. It does also try and write the data, but thats
551 * (hopefully) a no-op due to the VFS having already called filemap_fdatawrite()
552 * for us.
553 *
David Teiglandb3b94fa2006-01-16 16:50:04 +0000554 * Returns: errno
555 */
556
Christoph Hellwig7ea80852010-05-26 17:53:25 +0200557static int gfs2_fsync(struct file *file, int datasync)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000558{
Christoph Hellwig7ea80852010-05-26 17:53:25 +0200559 struct inode *inode = file->f_mapping->host;
Steven Whitehouse33c3de32006-11-30 10:14:32 -0500560 int sync_state = inode->i_state & (I_DIRTY_SYNC|I_DIRTY_DATASYNC);
561 int ret = 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000562
Steven Whitehouse33c3de32006-11-30 10:14:32 -0500563 if (gfs2_is_jdata(GFS2_I(inode))) {
564 gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl);
565 return 0;
566 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000567
Steven Whitehouse33c3de32006-11-30 10:14:32 -0500568 if (sync_state != 0) {
569 if (!datasync)
Steven Whitehouse34126f92006-12-07 09:13:14 -0500570 ret = write_inode_now(inode, 0);
Steven Whitehouse33c3de32006-11-30 10:14:32 -0500571
572 if (gfs2_is_stuffed(GFS2_I(inode)))
573 gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl);
574 }
575
576 return ret;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000577}
578
Steven Whitehouse56aa6162009-12-08 10:25:33 +0000579/**
580 * gfs2_file_aio_write - Perform a write to a file
581 * @iocb: The io context
582 * @iov: The data to write
583 * @nr_segs: Number of @iov segments
584 * @pos: The file position
585 *
586 * We have to do a lock/unlock here to refresh the inode size for
587 * O_APPEND writes, otherwise we can land up writing at the wrong
588 * offset. There is still a race, but provided the app is using its
589 * own file locking, this will make O_APPEND work as expected.
590 *
591 */
592
593static ssize_t gfs2_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
594 unsigned long nr_segs, loff_t pos)
595{
596 struct file *file = iocb->ki_filp;
597
598 if (file->f_flags & O_APPEND) {
599 struct dentry *dentry = file->f_dentry;
600 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
601 struct gfs2_holder gh;
602 int ret;
603
604 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
605 if (ret)
606 return ret;
607 gfs2_glock_dq_uninit(&gh);
608 }
609
610 return generic_file_aio_write(iocb, iov, nr_segs, pos);
611}
612
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000613#ifdef CONFIG_GFS2_FS_LOCKING_DLM
614
David Teiglandb3b94fa2006-01-16 16:50:04 +0000615/**
Marc Eshel60446062007-01-15 18:33:36 -0500616 * gfs2_setlease - acquire/release a file lease
617 * @file: the file pointer
618 * @arg: lease type
619 * @fl: file lock
620 *
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000621 * We don't currently have a way to enforce a lease across the whole
622 * cluster; until we do, disable leases (by just returning -EINVAL),
623 * unless the administrator has requested purely local locking.
624 *
Marc Eshel60446062007-01-15 18:33:36 -0500625 * Returns: errno
626 */
627
628static int gfs2_setlease(struct file *file, long arg, struct file_lock **fl)
629{
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000630 return -EINVAL;
Steven Whitehouseda755fd2008-01-30 15:34:04 +0000631}
632
Marc Eshel60446062007-01-15 18:33:36 -0500633/**
David Teiglandb3b94fa2006-01-16 16:50:04 +0000634 * gfs2_lock - acquire/release a posix lock on a file
635 * @file: the file pointer
636 * @cmd: either modify or retrieve lock state, possibly wait
637 * @fl: type and range of lock
638 *
639 * Returns: errno
640 */
641
642static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl)
643{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400644 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
645 struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000646 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000647
David Teiglandb3b94fa2006-01-16 16:50:04 +0000648 if (!(fl->fl_flags & FL_POSIX))
649 return -ENOLCK;
Sachin Prabhu720e7742010-03-11 12:24:45 -0500650 if (__mandatory_lock(&ip->i_inode) && fl->fl_type != F_UNLCK)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000651 return -ENOLCK;
652
Marc Eshel586759f2006-11-14 16:37:25 -0500653 if (cmd == F_CANCELLK) {
654 /* Hack: */
655 cmd = F_SETLK;
656 fl->fl_type = F_UNLCK;
657 }
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000658 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
659 return -EIO;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000660 if (IS_GETLK(cmd))
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000661 return dlm_posix_get(ls->ls_dlm, ip->i_no_addr, file, fl);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000662 else if (fl->fl_type == F_UNLCK)
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000663 return dlm_posix_unlock(ls->ls_dlm, ip->i_no_addr, file, fl);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000664 else
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000665 return dlm_posix_lock(ls->ls_dlm, ip->i_no_addr, file, cmd, fl);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000666}
667
David Teiglandb3b94fa2006-01-16 16:50:04 +0000668static int do_flock(struct file *file, int cmd, struct file_lock *fl)
669{
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500670 struct gfs2_file *fp = file->private_data;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000671 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
Josef Sipek81454092006-12-08 02:37:03 -0800672 struct gfs2_inode *ip = GFS2_I(file->f_path.dentry->d_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000673 struct gfs2_glock *gl;
674 unsigned int state;
675 int flags;
676 int error = 0;
677
678 state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED;
Steven Whitehouse6802e342008-05-21 17:03:22 +0100679 flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY) | GL_EXACT | GL_NOCACHE;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000680
Steven Whitehousef55ab262006-02-21 12:51:39 +0000681 mutex_lock(&fp->f_fl_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000682
683 gl = fl_gh->gh_gl;
684 if (gl) {
685 if (fl_gh->gh_state == state)
686 goto out;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000687 flock_lock_file_wait(file,
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400688 &(struct file_lock){.fl_type = F_UNLCK});
Abhijith Dasb4c20162007-09-13 23:35:27 -0500689 gfs2_glock_dq_wait(fl_gh);
690 gfs2_holder_reinit(state, flags, fl_gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000691 } else {
Steven Whitehouse6802e342008-05-21 17:03:22 +0100692 error = gfs2_glock_get(GFS2_SB(&ip->i_inode), ip->i_no_addr,
693 &gfs2_flock_glops, CREATE, &gl);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000694 if (error)
695 goto out;
Abhijith Dasb4c20162007-09-13 23:35:27 -0500696 gfs2_holder_init(gl, state, flags, fl_gh);
697 gfs2_glock_put(gl);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000698 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000699 error = gfs2_glock_nq(fl_gh);
700 if (error) {
701 gfs2_holder_uninit(fl_gh);
702 if (error == GLR_TRYFAILED)
703 error = -EAGAIN;
704 } else {
705 error = flock_lock_file_wait(file, fl);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400706 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000707 }
708
Steven Whitehouse420b9e52006-07-31 15:42:17 -0400709out:
Steven Whitehousef55ab262006-02-21 12:51:39 +0000710 mutex_unlock(&fp->f_fl_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000711 return error;
712}
713
714static void do_unflock(struct file *file, struct file_lock *fl)
715{
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500716 struct gfs2_file *fp = file->private_data;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000717 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
718
Steven Whitehousef55ab262006-02-21 12:51:39 +0000719 mutex_lock(&fp->f_fl_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000720 flock_lock_file_wait(file, fl);
721 if (fl_gh->gh_gl)
722 gfs2_glock_dq_uninit(fl_gh);
Steven Whitehousef55ab262006-02-21 12:51:39 +0000723 mutex_unlock(&fp->f_fl_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000724}
725
726/**
727 * gfs2_flock - acquire/release a flock lock on a file
728 * @file: the file pointer
729 * @cmd: either modify or retrieve lock state, possibly wait
730 * @fl: type and range of lock
731 *
732 * Returns: errno
733 */
734
735static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl)
736{
David Teiglandb3b94fa2006-01-16 16:50:04 +0000737 if (!(fl->fl_flags & FL_FLOCK))
738 return -ENOLCK;
Abhijith Dasa12af1e2009-06-01 12:30:03 -0500739 if (fl->fl_type & LOCK_MAND)
740 return -EOPNOTSUPP;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000741
David Teiglandb3b94fa2006-01-16 16:50:04 +0000742 if (fl->fl_type == F_UNLCK) {
743 do_unflock(file, fl);
744 return 0;
Steven Whitehoused00223f2006-10-02 10:28:05 -0400745 } else {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000746 return do_flock(file, cmd, fl);
Steven Whitehoused00223f2006-10-02 10:28:05 -0400747 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000748}
749
Christoph Hellwig10d21982009-04-07 19:42:17 +0200750const struct file_operations gfs2_file_fops = {
Steven Whitehouse26c1a572006-09-04 15:32:10 -0400751 .llseek = gfs2_llseek,
Steven Whitehoused00223f2006-10-02 10:28:05 -0400752 .read = do_sync_read,
Steven Whitehouse26c1a572006-09-04 15:32:10 -0400753 .aio_read = generic_file_aio_read,
Steven Whitehoused00223f2006-10-02 10:28:05 -0400754 .write = do_sync_write,
Steven Whitehouse56aa6162009-12-08 10:25:33 +0000755 .aio_write = gfs2_file_aio_write,
Steven Whitehouse26c1a572006-09-04 15:32:10 -0400756 .unlocked_ioctl = gfs2_ioctl,
757 .mmap = gfs2_mmap,
758 .open = gfs2_open,
759 .release = gfs2_close,
760 .fsync = gfs2_fsync,
761 .lock = gfs2_lock,
Steven Whitehouse26c1a572006-09-04 15:32:10 -0400762 .flock = gfs2_flock,
763 .splice_read = generic_file_splice_read,
764 .splice_write = generic_file_splice_write,
Marc Eshel60446062007-01-15 18:33:36 -0500765 .setlease = gfs2_setlease,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000766};
767
Christoph Hellwig10d21982009-04-07 19:42:17 +0200768const struct file_operations gfs2_dir_fops = {
Steven Whitehouse26c1a572006-09-04 15:32:10 -0400769 .readdir = gfs2_readdir,
770 .unlocked_ioctl = gfs2_ioctl,
771 .open = gfs2_open,
772 .release = gfs2_close,
773 .fsync = gfs2_fsync,
774 .lock = gfs2_lock,
775 .flock = gfs2_flock,
David Teiglandb3b94fa2006-01-16 16:50:04 +0000776};
777
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000778#endif /* CONFIG_GFS2_FS_LOCKING_DLM */
779
Christoph Hellwig10d21982009-04-07 19:42:17 +0200780const struct file_operations gfs2_file_fops_nolock = {
Wendy Chengc97bfe42007-11-29 17:56:51 -0500781 .llseek = gfs2_llseek,
782 .read = do_sync_read,
783 .aio_read = generic_file_aio_read,
784 .write = do_sync_write,
Steven Whitehouse56aa6162009-12-08 10:25:33 +0000785 .aio_write = gfs2_file_aio_write,
Wendy Chengc97bfe42007-11-29 17:56:51 -0500786 .unlocked_ioctl = gfs2_ioctl,
787 .mmap = gfs2_mmap,
788 .open = gfs2_open,
789 .release = gfs2_close,
790 .fsync = gfs2_fsync,
791 .splice_read = generic_file_splice_read,
792 .splice_write = generic_file_splice_write,
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000793 .setlease = generic_setlease,
Wendy Chengc97bfe42007-11-29 17:56:51 -0500794};
795
Christoph Hellwig10d21982009-04-07 19:42:17 +0200796const struct file_operations gfs2_dir_fops_nolock = {
Wendy Chengc97bfe42007-11-29 17:56:51 -0500797 .readdir = gfs2_readdir,
798 .unlocked_ioctl = gfs2_ioctl,
799 .open = gfs2_open,
800 .release = gfs2_close,
801 .fsync = gfs2_fsync,
802};
803