blob: 23eab473f09d9627e5d63c37aef02e83b6ede46a [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
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 Whitehouse7df0e032010-05-24 14:36:48 +0100223 error = -EACCES;
Serge E. Hallyn2e149672011-03-23 16:43:26 -0700224 if (!inode_owner_or_capable(inode))
Steven Whitehouse7df0e032010-05-24 14:36:48 +0100225 goto out;
226
227 error = 0;
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000228 flags = ip->i_diskflags;
Steven Whitehouse55eccc62006-04-04 14:29:30 -0400229 new_flags = (flags & ~mask) | (reqflags & mask);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500230 if ((new_flags ^ flags) == 0)
231 goto out;
232
233 error = -EINVAL;
234 if ((new_flags ^ flags) & ~GFS2_FLAGS_USER_SET)
235 goto out;
236
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500237 error = -EPERM;
238 if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE))
239 goto out;
240 if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY))
241 goto out;
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400242 if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) &&
Steven Whitehouseb9cb9812006-05-12 17:07:56 -0400243 !capable(CAP_LINUX_IMMUTABLE))
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500244 goto out;
Steven Whitehouseb9cb9812006-05-12 17:07:56 -0400245 if (!IS_IMMUTABLE(inode)) {
Nick Pigginb74c79e2011-01-07 17:49:58 +1100246 error = gfs2_permission(inode, MAY_WRITE, 0);
Steven Whitehouseb9cb9812006-05-12 17:07:56 -0400247 if (error)
248 goto out;
249 }
Steven Whitehouse55610932007-10-17 08:47:38 +0100250 if ((flags ^ new_flags) & GFS2_DIF_JDATA) {
251 if (flags & GFS2_DIF_JDATA)
252 gfs2_log_flush(sdp, ip->i_gl);
253 error = filemap_fdatawrite(inode->i_mapping);
254 if (error)
255 goto out;
256 error = filemap_fdatawait(inode->i_mapping);
257 if (error)
258 goto out;
259 }
Steven Whitehouse55eccc62006-04-04 14:29:30 -0400260 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500261 if (error)
262 goto out;
Steven Whitehouse55eccc62006-04-04 14:29:30 -0400263 error = gfs2_meta_inode_buffer(ip, &bh);
264 if (error)
265 goto out_trans_end;
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500266 gfs2_trans_add_bh(ip->i_gl, bh, 1);
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000267 ip->i_diskflags = new_flags;
Steven Whitehouse539e5d62006-10-31 15:07:05 -0500268 gfs2_dinode_out(ip, bh->b_data);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500269 brelse(bh);
Steven Whitehouse6b124d82006-11-08 12:51:06 -0500270 gfs2_set_inode_flags(inode);
Steven Whitehouse55610932007-10-17 08:47:38 +0100271 gfs2_set_aops(inode);
Steven Whitehouse55eccc62006-04-04 14:29:30 -0400272out_trans_end:
273 gfs2_trans_end(sdp);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500274out:
275 gfs2_glock_dq_uninit(&gh);
Miklos Szeredif58ba882008-07-02 21:12:01 +0200276out_drop_write:
277 mnt_drop_write(filp->f_path.mnt);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500278 return error;
279}
280
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400281static int gfs2_set_flags(struct file *filp, u32 __user *ptr)
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500282{
Steven Whitehouseb9af7ca2007-07-18 11:40:06 +0100283 struct inode *inode = filp->f_path.dentry->d_inode;
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400284 u32 fsflags, gfsflags;
Steven Whitehouse7df0e032010-05-24 14:36:48 +0100285
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400286 if (get_user(fsflags, ptr))
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500287 return -EFAULT;
Steven Whitehouse7df0e032010-05-24 14:36:48 +0100288
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400289 gfsflags = fsflags_cvt(fsflags_to_gfs2, fsflags);
Steven Whitehouseb9af7ca2007-07-18 11:40:06 +0100290 if (!S_ISDIR(inode->i_mode)) {
291 if (gfsflags & GFS2_DIF_INHERIT_JDATA)
292 gfsflags ^= (GFS2_DIF_JDATA | GFS2_DIF_INHERIT_JDATA);
Steven Whitehouseb9af7ca2007-07-18 11:40:06 +0100293 return do_gfs2_set_flags(filp, gfsflags, ~0);
294 }
295 return do_gfs2_set_flags(filp, gfsflags, ~GFS2_DIF_JDATA);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500296}
297
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400298static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500299{
300 switch(cmd) {
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400301 case FS_IOC_GETFLAGS:
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400302 return gfs2_get_flags(filp, (u32 __user *)arg);
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400303 case FS_IOC_SETFLAGS:
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400304 return gfs2_set_flags(filp, (u32 __user *)arg);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500305 }
306 return -ENOTTY;
307}
308
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100309/**
310 * gfs2_allocate_page_backing - Use bmap to allocate blocks
311 * @page: The (locked) page to allocate backing for
312 *
313 * We try to allocate all the blocks required for the page in
314 * one go. This might fail for various reasons, so we keep
315 * trying until all the blocks to back this page are allocated.
316 * If some of the blocks are already allocated, thats ok too.
317 */
318
319static int gfs2_allocate_page_backing(struct page *page)
320{
321 struct inode *inode = page->mapping->host;
322 struct buffer_head bh;
323 unsigned long size = PAGE_CACHE_SIZE;
324 u64 lblock = page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
325
326 do {
327 bh.b_state = 0;
328 bh.b_size = size;
Bob Petersone9e1ef22007-12-10 14:13:27 -0600329 gfs2_block_map(inode, lblock, &bh, 1);
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100330 if (!buffer_mapped(&bh))
331 return -EIO;
332 size -= bh.b_size;
333 lblock += (bh.b_size >> inode->i_blkbits);
334 } while(size > 0);
335 return 0;
336}
337
338/**
339 * gfs2_page_mkwrite - Make a shared, mmap()ed, page writable
340 * @vma: The virtual memory area
341 * @page: The page which is about to become writable
342 *
343 * When the page becomes writable, we need to ensure that we have
344 * blocks allocated on disk to back that page.
345 */
346
Nick Pigginc2ec1752009-03-31 15:23:21 -0700347static int gfs2_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100348{
Nick Pigginc2ec1752009-03-31 15:23:21 -0700349 struct page *page = vmf->page;
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100350 struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
351 struct gfs2_inode *ip = GFS2_I(inode);
352 struct gfs2_sbd *sdp = GFS2_SB(inode);
353 unsigned long last_index;
Benjamin Marzinskic8f554b2009-01-06 10:47:50 -0600354 u64 pos = page->index << PAGE_CACHE_SHIFT;
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100355 unsigned int data_blocks, ind_blocks, rblocks;
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100356 struct gfs2_holder gh;
357 struct gfs2_alloc *al;
358 int ret;
359
Steven Whitehouse719ee342008-09-18 13:53:59 +0100360 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
361 ret = gfs2_glock_nq(&gh);
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100362 if (ret)
363 goto out;
364
Steven Whitehouse9c538832009-03-19 13:15:44 +0000365 set_bit(GLF_DIRTY, &ip->i_gl->gl_flags);
366 set_bit(GIF_SW_PAGED, &ip->i_flags);
367
Bob Peterson461cb412010-06-24 19:21:20 -0400368 if (!gfs2_write_alloc_required(ip, pos, PAGE_CACHE_SIZE))
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100369 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;
Benjamin Marzinskibf97b672010-09-27 16:00:04 -0500387 if (ind_blocks || data_blocks) {
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100388 rblocks += RES_STATFS + RES_QUOTA;
Benjamin Marzinskibf97b672010-09-27 16:00:04 -0500389 rblocks += gfs2_rg_blocks(al);
390 }
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100391 ret = gfs2_trans_begin(sdp, rblocks, 0);
392 if (ret)
393 goto out_trans_fail;
394
395 lock_page(page);
396 ret = -EINVAL;
397 last_index = ip->i_inode.i_size >> PAGE_CACHE_SHIFT;
398 if (page->index > last_index)
399 goto out_unlock_page;
Steven Whitehouseb7fe2e32008-01-17 15:12:03 +0000400 ret = 0;
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100401 if (!PageUptodate(page) || page->mapping != ip->i_inode.i_mapping)
402 goto out_unlock_page;
403 if (gfs2_is_stuffed(ip)) {
404 ret = gfs2_unstuff_dinode(ip, page);
405 if (ret)
406 goto out_unlock_page;
407 }
408 ret = gfs2_allocate_page_backing(page);
409
410out_unlock_page:
411 unlock_page(page);
412 gfs2_trans_end(sdp);
413out_trans_fail:
414 gfs2_inplace_release(ip);
415out_quota_unlock:
416 gfs2_quota_unlock(ip);
417out_alloc_put:
418 gfs2_alloc_put(ip);
419out_unlock:
420 gfs2_glock_dq(&gh);
421out:
422 gfs2_holder_uninit(&gh);
Steven Whitehousee56985d2009-04-20 09:45:54 +0100423 if (ret == -ENOMEM)
424 ret = VM_FAULT_OOM;
425 else if (ret)
Nick Pigginc2ec1752009-03-31 15:23:21 -0700426 ret = VM_FAULT_SIGBUS;
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100427 return ret;
428}
429
Alexey Dobriyanf0f37e22009-09-27 22:29:37 +0400430static const struct vm_operations_struct gfs2_vm_ops = {
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100431 .fault = filemap_fault,
432 .page_mkwrite = gfs2_page_mkwrite,
433};
434
David Teiglandb3b94fa2006-01-16 16:50:04 +0000435/**
436 * gfs2_mmap -
437 * @file: The file to map
438 * @vma: The VMA which described the mapping
439 *
Steven Whitehouse48bf2b12009-04-29 13:59:35 +0100440 * There is no need to get a lock here unless we should be updating
441 * atime. We ignore any locking errors since the only consequence is
442 * a missed atime update (which will just be deferred until later).
443 *
444 * Returns: 0
David Teiglandb3b94fa2006-01-16 16:50:04 +0000445 */
446
447static int gfs2_mmap(struct file *file, struct vm_area_struct *vma)
448{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400449 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000450
Steven Whitehouseb9c93bb2011-02-02 14:48:10 +0000451 if (!(file->f_flags & O_NOATIME) &&
452 !IS_NOATIME(&ip->i_inode)) {
Steven Whitehouse48bf2b12009-04-29 13:59:35 +0100453 struct gfs2_holder i_gh;
454 int error;
455
Steven Whitehouseb9c93bb2011-02-02 14:48:10 +0000456 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
Steven Whitehouse48bf2b12009-04-29 13:59:35 +0100457 error = gfs2_glock_nq(&i_gh);
Steven Whitehouseb9c93bb2011-02-02 14:48:10 +0000458 if (error == 0) {
459 file_accessed(file);
460 gfs2_glock_dq(&i_gh);
461 }
462 gfs2_holder_uninit(&i_gh);
463 if (error)
464 return error;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000465 }
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100466 vma->vm_ops = &gfs2_vm_ops;
Steven Whitehouse48bf2b12009-04-29 13:59:35 +0100467 vma->vm_flags |= VM_CAN_NONLINEAR;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000468
Steven Whitehouse48bf2b12009-04-29 13:59:35 +0100469 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000470}
471
472/**
473 * gfs2_open - open a file
474 * @inode: the inode to open
475 * @file: the struct file for this opening
476 *
477 * Returns: errno
478 */
479
480static int gfs2_open(struct inode *inode, struct file *file)
481{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400482 struct gfs2_inode *ip = GFS2_I(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000483 struct gfs2_holder i_gh;
484 struct gfs2_file *fp;
485 int error;
486
David Teiglandb3b94fa2006-01-16 16:50:04 +0000487 fp = kzalloc(sizeof(struct gfs2_file), GFP_KERNEL);
488 if (!fp)
489 return -ENOMEM;
490
Steven Whitehousef55ab262006-02-21 12:51:39 +0000491 mutex_init(&fp->f_fl_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000492
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400493 gfs2_assert_warn(GFS2_SB(inode), !file->private_data);
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500494 file->private_data = fp;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000495
Steven Whitehouseb60623c2006-11-01 12:22:46 -0500496 if (S_ISREG(ip->i_inode.i_mode)) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000497 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
498 &i_gh);
499 if (error)
500 goto fail;
501
502 if (!(file->f_flags & O_LARGEFILE) &&
Steven Whitehousea2e0f792010-08-11 09:53:11 +0100503 i_size_read(inode) > MAX_NON_LFS) {
Alan Coxa9c62a12007-10-16 23:30:22 -0700504 error = -EOVERFLOW;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000505 goto fail_gunlock;
506 }
507
David Teiglandb3b94fa2006-01-16 16:50:04 +0000508 gfs2_glock_dq_uninit(&i_gh);
509 }
510
511 return 0;
512
Steven Whitehouse420b9e52006-07-31 15:42:17 -0400513fail_gunlock:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000514 gfs2_glock_dq_uninit(&i_gh);
Steven Whitehouse420b9e52006-07-31 15:42:17 -0400515fail:
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500516 file->private_data = NULL;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000517 kfree(fp);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000518 return error;
519}
520
521/**
522 * gfs2_close - called to close a struct file
523 * @inode: the inode the struct file belongs to
524 * @file: the struct file being closed
525 *
526 * Returns: errno
527 */
528
529static int gfs2_close(struct inode *inode, struct file *file)
530{
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500531 struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000532 struct gfs2_file *fp;
533
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500534 fp = file->private_data;
535 file->private_data = NULL;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000536
537 if (gfs2_assert_warn(sdp, fp))
538 return -EIO;
539
540 kfree(fp);
541
542 return 0;
543}
544
545/**
546 * gfs2_fsync - sync the dirty data for a file (across the cluster)
547 * @file: the file that points to the dentry (we ignore this)
Steven Whitehousedba898b2011-04-14 09:54:02 +0100548 * @datasync: set if we can ignore timestamp changes
David Teiglandb3b94fa2006-01-16 16:50:04 +0000549 *
Steven Whitehousedba898b2011-04-14 09:54:02 +0100550 * The VFS will flush data for us. We only need to worry
551 * about metadata here.
Steven Whitehouse34126f92006-12-07 09:13:14 -0500552 *
David Teiglandb3b94fa2006-01-16 16:50:04 +0000553 * Returns: errno
554 */
555
Christoph Hellwig7ea80852010-05-26 17:53:25 +0200556static int gfs2_fsync(struct file *file, int datasync)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000557{
Christoph Hellwig7ea80852010-05-26 17:53:25 +0200558 struct inode *inode = file->f_mapping->host;
Steven Whitehouse33c3de32006-11-30 10:14:32 -0500559 int sync_state = inode->i_state & (I_DIRTY_SYNC|I_DIRTY_DATASYNC);
Steven Whitehousedba898b2011-04-14 09:54:02 +0100560 struct gfs2_inode *ip = GFS2_I(inode);
561 int ret;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000562
Steven Whitehousedba898b2011-04-14 09:54:02 +0100563 if (datasync)
564 sync_state &= ~I_DIRTY_SYNC;
565
566 if (sync_state) {
567 ret = sync_inode_metadata(inode, 1);
568 if (ret)
569 return ret;
570 gfs2_ail_flush(ip->i_gl);
Steven Whitehouse33c3de32006-11-30 10:14:32 -0500571 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000572
Steven Whitehousedba898b2011-04-14 09:54:02 +0100573 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000574}
575
Steven Whitehouse56aa6162009-12-08 10:25:33 +0000576/**
577 * gfs2_file_aio_write - Perform a write to a file
578 * @iocb: The io context
579 * @iov: The data to write
580 * @nr_segs: Number of @iov segments
581 * @pos: The file position
582 *
583 * We have to do a lock/unlock here to refresh the inode size for
584 * O_APPEND writes, otherwise we can land up writing at the wrong
585 * offset. There is still a race, but provided the app is using its
586 * own file locking, this will make O_APPEND work as expected.
587 *
588 */
589
590static ssize_t gfs2_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
591 unsigned long nr_segs, loff_t pos)
592{
593 struct file *file = iocb->ki_filp;
594
595 if (file->f_flags & O_APPEND) {
596 struct dentry *dentry = file->f_dentry;
597 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
598 struct gfs2_holder gh;
599 int ret;
600
601 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
602 if (ret)
603 return ret;
604 gfs2_glock_dq_uninit(&gh);
605 }
606
607 return generic_file_aio_write(iocb, iov, nr_segs, pos);
608}
609
Benjamin Marzinski0ee53202011-03-17 21:54:46 -0500610static int empty_write_end(struct page *page, unsigned from,
611 unsigned to, int mode)
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100612{
Benjamin Marzinski0ee53202011-03-17 21:54:46 -0500613 struct inode *inode = page->mapping->host;
614 struct gfs2_inode *ip = GFS2_I(inode);
615 struct buffer_head *bh;
616 unsigned offset, blksize = 1 << inode->i_blkbits;
617 pgoff_t end_index = i_size_read(inode) >> PAGE_CACHE_SHIFT;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100618
Benjamin Marzinskie4a7b7b2011-03-11 00:49:09 -0600619 zero_user(page, from, to-from);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100620 mark_page_accessed(page);
621
Benjamin Marzinski0ee53202011-03-17 21:54:46 -0500622 if (page->index < end_index || !(mode & FALLOC_FL_KEEP_SIZE)) {
623 if (!gfs2_is_writeback(ip))
624 gfs2_page_add_databufs(ip, page, from, to);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100625
Benjamin Marzinski0ee53202011-03-17 21:54:46 -0500626 block_commit_write(page, from, to);
627 return 0;
628 }
629
630 offset = 0;
631 bh = page_buffers(page);
632 while (offset < to) {
633 if (offset >= from) {
634 set_buffer_uptodate(bh);
635 mark_buffer_dirty(bh);
636 clear_buffer_new(bh);
637 write_dirty_buffer(bh, WRITE);
638 }
639 offset += blksize;
640 bh = bh->b_this_page;
641 }
642
643 offset = 0;
644 bh = page_buffers(page);
645 while (offset < to) {
646 if (offset >= from) {
647 wait_on_buffer(bh);
648 if (!buffer_uptodate(bh))
649 return -EIO;
650 }
651 offset += blksize;
652 bh = bh->b_this_page;
653 }
654 return 0;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100655}
656
Benjamin Marzinskie4a7b7b2011-03-11 00:49:09 -0600657static int needs_empty_write(sector_t block, struct inode *inode)
658{
659 int error;
660 struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
661
662 bh_map.b_size = 1 << inode->i_blkbits;
663 error = gfs2_block_map(inode, block, &bh_map, 0);
664 if (unlikely(error))
665 return error;
666 return !buffer_mapped(&bh_map);
667}
668
Benjamin Marzinski0ee53202011-03-17 21:54:46 -0500669static int write_empty_blocks(struct page *page, unsigned from, unsigned to,
670 int mode)
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100671{
Benjamin Marzinskie4a7b7b2011-03-11 00:49:09 -0600672 struct inode *inode = page->mapping->host;
673 unsigned start, end, next, blksize;
674 sector_t block = page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
675 int ret;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100676
Benjamin Marzinskie4a7b7b2011-03-11 00:49:09 -0600677 blksize = 1 << inode->i_blkbits;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100678 next = end = 0;
679 while (next < from) {
Benjamin Marzinskie4a7b7b2011-03-11 00:49:09 -0600680 next += blksize;
681 block++;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100682 }
683 start = next;
684 do {
Benjamin Marzinskie4a7b7b2011-03-11 00:49:09 -0600685 next += blksize;
686 ret = needs_empty_write(block, inode);
687 if (unlikely(ret < 0))
688 return ret;
689 if (ret == 0) {
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100690 if (end) {
Benjamin Marzinskie4a7b7b2011-03-11 00:49:09 -0600691 ret = __block_write_begin(page, start, end - start,
692 gfs2_block_map);
693 if (unlikely(ret))
694 return ret;
Benjamin Marzinski0ee53202011-03-17 21:54:46 -0500695 ret = empty_write_end(page, start, end, mode);
696 if (unlikely(ret))
697 return ret;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100698 end = 0;
699 }
700 start = next;
701 }
702 else
703 end = next;
Benjamin Marzinskie4a7b7b2011-03-11 00:49:09 -0600704 block++;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100705 } while (next < to);
706
707 if (end) {
Benjamin Marzinskie4a7b7b2011-03-11 00:49:09 -0600708 ret = __block_write_begin(page, start, end - start, gfs2_block_map);
709 if (unlikely(ret))
710 return ret;
Benjamin Marzinski0ee53202011-03-17 21:54:46 -0500711 ret = empty_write_end(page, start, end, mode);
712 if (unlikely(ret))
713 return ret;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100714 }
715
716 return 0;
717}
718
719static int fallocate_chunk(struct inode *inode, loff_t offset, loff_t len,
720 int mode)
721{
722 struct gfs2_inode *ip = GFS2_I(inode);
723 struct buffer_head *dibh;
724 int error;
725 u64 start = offset >> PAGE_CACHE_SHIFT;
726 unsigned int start_offset = offset & ~PAGE_CACHE_MASK;
727 u64 end = (offset + len - 1) >> PAGE_CACHE_SHIFT;
728 pgoff_t curr;
729 struct page *page;
730 unsigned int end_offset = (offset + len) & ~PAGE_CACHE_MASK;
731 unsigned int from, to;
732
733 if (!end_offset)
734 end_offset = PAGE_CACHE_SIZE;
735
736 error = gfs2_meta_inode_buffer(ip, &dibh);
737 if (unlikely(error))
738 goto out;
739
740 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
741
742 if (gfs2_is_stuffed(ip)) {
743 error = gfs2_unstuff_dinode(ip, NULL);
744 if (unlikely(error))
745 goto out;
746 }
747
748 curr = start;
749 offset = start << PAGE_CACHE_SHIFT;
750 from = start_offset;
751 to = PAGE_CACHE_SIZE;
752 while (curr <= end) {
753 page = grab_cache_page_write_begin(inode->i_mapping, curr,
754 AOP_FLAG_NOFS);
755 if (unlikely(!page)) {
756 error = -ENOMEM;
757 goto out;
758 }
759
760 if (curr == end)
761 to = end_offset;
Benjamin Marzinski0ee53202011-03-17 21:54:46 -0500762 error = write_empty_blocks(page, from, to, mode);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100763 if (!error && offset + to > inode->i_size &&
764 !(mode & FALLOC_FL_KEEP_SIZE)) {
765 i_size_write(inode, offset + to);
766 }
767 unlock_page(page);
768 page_cache_release(page);
769 if (error)
770 goto out;
771 curr++;
772 offset += PAGE_CACHE_SIZE;
773 from = 0;
774 }
775
776 gfs2_dinode_out(ip, dibh->b_data);
777 mark_inode_dirty(inode);
778
779 brelse(dibh);
780
781out:
782 return error;
783}
784
785static void calc_max_reserv(struct gfs2_inode *ip, loff_t max, loff_t *len,
786 unsigned int *data_blocks, unsigned int *ind_blocks)
787{
788 const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
789 unsigned int max_blocks = ip->i_alloc->al_rgd->rd_free_clone;
790 unsigned int tmp, max_data = max_blocks - 3 * (sdp->sd_max_height - 1);
791
792 for (tmp = max_data; tmp > sdp->sd_diptrs;) {
793 tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs);
794 max_data -= tmp;
795 }
796 /* This calculation isn't the exact reverse of gfs2_write_calc_reserve,
797 so it might end up with fewer data blocks */
798 if (max_data <= *data_blocks)
799 return;
800 *data_blocks = max_data;
801 *ind_blocks = max_blocks - max_data;
802 *len = ((loff_t)max_data - 3) << sdp->sd_sb.sb_bsize_shift;
803 if (*len > max) {
804 *len = max;
805 gfs2_write_calc_reserv(ip, max, data_blocks, ind_blocks);
806 }
807}
808
809static long gfs2_fallocate(struct file *file, int mode, loff_t offset,
810 loff_t len)
811{
812 struct inode *inode = file->f_path.dentry->d_inode;
813 struct gfs2_sbd *sdp = GFS2_SB(inode);
814 struct gfs2_inode *ip = GFS2_I(inode);
815 unsigned int data_blocks = 0, ind_blocks = 0, rblocks;
816 loff_t bytes, max_bytes;
817 struct gfs2_alloc *al;
818 int error;
819 loff_t next = (offset + len - 1) >> sdp->sd_sb.sb_bsize_shift;
820 next = (next + 1) << sdp->sd_sb.sb_bsize_shift;
821
822 /* We only support the FALLOC_FL_KEEP_SIZE mode */
823 if (mode & ~FALLOC_FL_KEEP_SIZE)
824 return -EOPNOTSUPP;
825
826 offset = (offset >> sdp->sd_sb.sb_bsize_shift) <<
827 sdp->sd_sb.sb_bsize_shift;
828
829 len = next - offset;
830 bytes = sdp->sd_max_rg_data * sdp->sd_sb.sb_bsize / 2;
831 if (!bytes)
832 bytes = UINT_MAX;
833
834 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &ip->i_gh);
835 error = gfs2_glock_nq(&ip->i_gh);
836 if (unlikely(error))
837 goto out_uninit;
838
839 if (!gfs2_write_alloc_required(ip, offset, len))
840 goto out_unlock;
841
842 while (len > 0) {
843 if (len < bytes)
844 bytes = len;
845 al = gfs2_alloc_get(ip);
846 if (!al) {
847 error = -ENOMEM;
848 goto out_unlock;
849 }
850
851 error = gfs2_quota_lock_check(ip);
852 if (error)
853 goto out_alloc_put;
854
855retry:
856 gfs2_write_calc_reserv(ip, bytes, &data_blocks, &ind_blocks);
857
858 al->al_requested = data_blocks + ind_blocks;
859 error = gfs2_inplace_reserve(ip);
860 if (error) {
861 if (error == -ENOSPC && bytes > sdp->sd_sb.sb_bsize) {
862 bytes >>= 1;
863 goto retry;
864 }
865 goto out_qunlock;
866 }
867 max_bytes = bytes;
868 calc_max_reserv(ip, len, &max_bytes, &data_blocks, &ind_blocks);
869 al->al_requested = data_blocks + ind_blocks;
870
871 rblocks = RES_DINODE + ind_blocks + RES_STATFS + RES_QUOTA +
872 RES_RG_HDR + gfs2_rg_blocks(al);
873 if (gfs2_is_jdata(ip))
874 rblocks += data_blocks ? data_blocks : 1;
875
876 error = gfs2_trans_begin(sdp, rblocks,
877 PAGE_CACHE_SIZE/sdp->sd_sb.sb_bsize);
878 if (error)
879 goto out_trans_fail;
880
881 error = fallocate_chunk(inode, offset, max_bytes, mode);
882 gfs2_trans_end(sdp);
883
884 if (error)
885 goto out_trans_fail;
886
887 len -= max_bytes;
888 offset += max_bytes;
889 gfs2_inplace_release(ip);
890 gfs2_quota_unlock(ip);
891 gfs2_alloc_put(ip);
892 }
893 goto out_unlock;
894
895out_trans_fail:
896 gfs2_inplace_release(ip);
897out_qunlock:
898 gfs2_quota_unlock(ip);
899out_alloc_put:
900 gfs2_alloc_put(ip);
901out_unlock:
902 gfs2_glock_dq(&ip->i_gh);
903out_uninit:
904 gfs2_holder_uninit(&ip->i_gh);
905 return error;
906}
907
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000908#ifdef CONFIG_GFS2_FS_LOCKING_DLM
909
David Teiglandb3b94fa2006-01-16 16:50:04 +0000910/**
Marc Eshel60446062007-01-15 18:33:36 -0500911 * gfs2_setlease - acquire/release a file lease
912 * @file: the file pointer
913 * @arg: lease type
914 * @fl: file lock
915 *
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000916 * We don't currently have a way to enforce a lease across the whole
917 * cluster; until we do, disable leases (by just returning -EINVAL),
918 * unless the administrator has requested purely local locking.
919 *
Arnd Bergmannb89f4322010-09-18 15:09:31 +0200920 * Locking: called under lock_flocks
921 *
Marc Eshel60446062007-01-15 18:33:36 -0500922 * Returns: errno
923 */
924
925static int gfs2_setlease(struct file *file, long arg, struct file_lock **fl)
926{
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000927 return -EINVAL;
Steven Whitehouseda755fd2008-01-30 15:34:04 +0000928}
929
Marc Eshel60446062007-01-15 18:33:36 -0500930/**
David Teiglandb3b94fa2006-01-16 16:50:04 +0000931 * gfs2_lock - acquire/release a posix lock on a file
932 * @file: the file pointer
933 * @cmd: either modify or retrieve lock state, possibly wait
934 * @fl: type and range of lock
935 *
936 * Returns: errno
937 */
938
939static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl)
940{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400941 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
942 struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000943 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000944
David Teiglandb3b94fa2006-01-16 16:50:04 +0000945 if (!(fl->fl_flags & FL_POSIX))
946 return -ENOLCK;
Sachin Prabhu720e7742010-03-11 12:24:45 -0500947 if (__mandatory_lock(&ip->i_inode) && fl->fl_type != F_UNLCK)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000948 return -ENOLCK;
949
Marc Eshel586759f2006-11-14 16:37:25 -0500950 if (cmd == F_CANCELLK) {
951 /* Hack: */
952 cmd = F_SETLK;
953 fl->fl_type = F_UNLCK;
954 }
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000955 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
956 return -EIO;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000957 if (IS_GETLK(cmd))
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000958 return dlm_posix_get(ls->ls_dlm, ip->i_no_addr, file, fl);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000959 else if (fl->fl_type == F_UNLCK)
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000960 return dlm_posix_unlock(ls->ls_dlm, ip->i_no_addr, file, fl);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000961 else
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000962 return dlm_posix_lock(ls->ls_dlm, ip->i_no_addr, file, cmd, fl);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000963}
964
David Teiglandb3b94fa2006-01-16 16:50:04 +0000965static int do_flock(struct file *file, int cmd, struct file_lock *fl)
966{
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500967 struct gfs2_file *fp = file->private_data;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000968 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
Josef Sipek81454092006-12-08 02:37:03 -0800969 struct gfs2_inode *ip = GFS2_I(file->f_path.dentry->d_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000970 struct gfs2_glock *gl;
971 unsigned int state;
972 int flags;
973 int error = 0;
974
975 state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED;
Steven Whitehouse6802e342008-05-21 17:03:22 +0100976 flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY) | GL_EXACT | GL_NOCACHE;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000977
Steven Whitehousef55ab262006-02-21 12:51:39 +0000978 mutex_lock(&fp->f_fl_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000979
980 gl = fl_gh->gh_gl;
981 if (gl) {
982 if (fl_gh->gh_state == state)
983 goto out;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000984 flock_lock_file_wait(file,
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400985 &(struct file_lock){.fl_type = F_UNLCK});
Abhijith Dasb4c20162007-09-13 23:35:27 -0500986 gfs2_glock_dq_wait(fl_gh);
987 gfs2_holder_reinit(state, flags, fl_gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000988 } else {
Steven Whitehouse6802e342008-05-21 17:03:22 +0100989 error = gfs2_glock_get(GFS2_SB(&ip->i_inode), ip->i_no_addr,
990 &gfs2_flock_glops, CREATE, &gl);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000991 if (error)
992 goto out;
Abhijith Dasb4c20162007-09-13 23:35:27 -0500993 gfs2_holder_init(gl, state, flags, fl_gh);
994 gfs2_glock_put(gl);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000995 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000996 error = gfs2_glock_nq(fl_gh);
997 if (error) {
998 gfs2_holder_uninit(fl_gh);
999 if (error == GLR_TRYFAILED)
1000 error = -EAGAIN;
1001 } else {
1002 error = flock_lock_file_wait(file, fl);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001003 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001004 }
1005
Steven Whitehouse420b9e52006-07-31 15:42:17 -04001006out:
Steven Whitehousef55ab262006-02-21 12:51:39 +00001007 mutex_unlock(&fp->f_fl_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001008 return error;
1009}
1010
1011static void do_unflock(struct file *file, struct file_lock *fl)
1012{
Steven Whitehouse5c676f62006-02-27 17:23:27 -05001013 struct gfs2_file *fp = file->private_data;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001014 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
1015
Steven Whitehousef55ab262006-02-21 12:51:39 +00001016 mutex_lock(&fp->f_fl_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001017 flock_lock_file_wait(file, fl);
Steven Whitehouse0a334432011-03-09 11:14:32 +00001018 if (fl_gh->gh_gl) {
1019 gfs2_glock_dq_wait(fl_gh);
1020 gfs2_holder_uninit(fl_gh);
1021 }
Steven Whitehousef55ab262006-02-21 12:51:39 +00001022 mutex_unlock(&fp->f_fl_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001023}
1024
1025/**
1026 * gfs2_flock - acquire/release a flock lock on a file
1027 * @file: the file pointer
1028 * @cmd: either modify or retrieve lock state, possibly wait
1029 * @fl: type and range of lock
1030 *
1031 * Returns: errno
1032 */
1033
1034static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl)
1035{
David Teiglandb3b94fa2006-01-16 16:50:04 +00001036 if (!(fl->fl_flags & FL_FLOCK))
1037 return -ENOLCK;
Abhijith Dasa12af1e2009-06-01 12:30:03 -05001038 if (fl->fl_type & LOCK_MAND)
1039 return -EOPNOTSUPP;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001040
David Teiglandb3b94fa2006-01-16 16:50:04 +00001041 if (fl->fl_type == F_UNLCK) {
1042 do_unflock(file, fl);
1043 return 0;
Steven Whitehoused00223f2006-10-02 10:28:05 -04001044 } else {
David Teiglandb3b94fa2006-01-16 16:50:04 +00001045 return do_flock(file, cmd, fl);
Steven Whitehoused00223f2006-10-02 10:28:05 -04001046 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001047}
1048
Christoph Hellwig10d21982009-04-07 19:42:17 +02001049const struct file_operations gfs2_file_fops = {
Steven Whitehouse26c1a572006-09-04 15:32:10 -04001050 .llseek = gfs2_llseek,
Steven Whitehoused00223f2006-10-02 10:28:05 -04001051 .read = do_sync_read,
Steven Whitehouse26c1a572006-09-04 15:32:10 -04001052 .aio_read = generic_file_aio_read,
Steven Whitehoused00223f2006-10-02 10:28:05 -04001053 .write = do_sync_write,
Steven Whitehouse56aa6162009-12-08 10:25:33 +00001054 .aio_write = gfs2_file_aio_write,
Steven Whitehouse26c1a572006-09-04 15:32:10 -04001055 .unlocked_ioctl = gfs2_ioctl,
1056 .mmap = gfs2_mmap,
1057 .open = gfs2_open,
1058 .release = gfs2_close,
1059 .fsync = gfs2_fsync,
1060 .lock = gfs2_lock,
Steven Whitehouse26c1a572006-09-04 15:32:10 -04001061 .flock = gfs2_flock,
1062 .splice_read = generic_file_splice_read,
1063 .splice_write = generic_file_splice_write,
Marc Eshel60446062007-01-15 18:33:36 -05001064 .setlease = gfs2_setlease,
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01001065 .fallocate = gfs2_fallocate,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001066};
1067
Christoph Hellwig10d21982009-04-07 19:42:17 +02001068const struct file_operations gfs2_dir_fops = {
Steven Whitehouse26c1a572006-09-04 15:32:10 -04001069 .readdir = gfs2_readdir,
1070 .unlocked_ioctl = gfs2_ioctl,
1071 .open = gfs2_open,
1072 .release = gfs2_close,
1073 .fsync = gfs2_fsync,
1074 .lock = gfs2_lock,
1075 .flock = gfs2_flock,
Arnd Bergmann6038f372010-08-15 18:52:59 +02001076 .llseek = default_llseek,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001077};
1078
Steven Whitehousef057f6c2009-01-12 10:43:39 +00001079#endif /* CONFIG_GFS2_FS_LOCKING_DLM */
1080
Christoph Hellwig10d21982009-04-07 19:42:17 +02001081const struct file_operations gfs2_file_fops_nolock = {
Wendy Chengc97bfe42007-11-29 17:56:51 -05001082 .llseek = gfs2_llseek,
1083 .read = do_sync_read,
1084 .aio_read = generic_file_aio_read,
1085 .write = do_sync_write,
Steven Whitehouse56aa6162009-12-08 10:25:33 +00001086 .aio_write = gfs2_file_aio_write,
Wendy Chengc97bfe42007-11-29 17:56:51 -05001087 .unlocked_ioctl = gfs2_ioctl,
1088 .mmap = gfs2_mmap,
1089 .open = gfs2_open,
1090 .release = gfs2_close,
1091 .fsync = gfs2_fsync,
1092 .splice_read = generic_file_splice_read,
1093 .splice_write = generic_file_splice_write,
Steven Whitehousef057f6c2009-01-12 10:43:39 +00001094 .setlease = generic_setlease,
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01001095 .fallocate = gfs2_fallocate,
Wendy Chengc97bfe42007-11-29 17:56:51 -05001096};
1097
Christoph Hellwig10d21982009-04-07 19:42:17 +02001098const struct file_operations gfs2_dir_fops_nolock = {
Wendy Chengc97bfe42007-11-29 17:56:51 -05001099 .readdir = gfs2_readdir,
1100 .unlocked_ioctl = gfs2_ioctl,
1101 .open = gfs2_open,
1102 .release = gfs2_close,
1103 .fsync = gfs2_fsync,
Arnd Bergmann6038f372010-08-15 18:52:59 +02001104 .llseek = default_llseek,
Wendy Chengc97bfe42007-11-29 17:56:51 -05001105};
1106