blob: edeb9e80290382b39491d67c40ed3802535aac2b [file] [log] [blame]
David Teiglandb3b94fa2006-01-16 16:50:04 +00001/*
2 * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved.
Steven Whitehouse3a8a9a12006-05-18 15:09:15 -04003 * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved.
David Teiglandb3b94fa2006-01-16 16:50:04 +00004 *
5 * This copyrighted material is made available to anyone wishing to use,
6 * modify, copy, or redistribute it subject to the terms and conditions
Steven Whitehousee9fc2aa2006-09-01 11:05:15 -04007 * of the GNU General Public License version 2.
David Teiglandb3b94fa2006-01-16 16:50:04 +00008 */
9
David Teiglandb3b94fa2006-01-16 16:50:04 +000010#include <linux/slab.h>
11#include <linux/spinlock.h>
12#include <linux/completion.h>
13#include <linux/buffer_head.h>
14#include <linux/pagemap.h>
15#include <linux/uio.h>
16#include <linux/blkdev.h>
17#include <linux/mm.h>
Miklos Szeredif58ba882008-07-02 21:12:01 +020018#include <linux/mount.h>
Steven Whitehouse18ec7d52006-02-08 11:50:51 +000019#include <linux/fs.h>
Steven Whitehouse5c676f62006-02-27 17:23:27 -050020#include <linux/gfs2_ondisk.h>
Steven Whitehouse71b86f52006-03-28 14:14:04 -050021#include <linux/ext2_fs.h>
Christoph Hellwig2fe17c12011-01-14 13:07:43 +010022#include <linux/falloc.h>
23#include <linux/swap.h>
Steven Whitehouse71b86f52006-03-28 14:14:04 -050024#include <linux/crc32.h>
Steven Whitehouse33c3de32006-11-30 10:14:32 -050025#include <linux/writeback.h>
David Teiglandb3b94fa2006-01-16 16:50:04 +000026#include <asm/uaccess.h>
Steven Whitehousef057f6c2009-01-12 10:43:39 +000027#include <linux/dlm.h>
28#include <linux/dlm_plock.h>
David Teiglandb3b94fa2006-01-16 16:50:04 +000029
30#include "gfs2.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050031#include "incore.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000032#include "bmap.h"
33#include "dir.h"
34#include "glock.h"
35#include "glops.h"
36#include "inode.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000037#include "log.h"
38#include "meta_io.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000039#include "quota.h"
40#include "rgrp.h"
41#include "trans.h"
Steven Whitehouse5c676f62006-02-27 17:23:27 -050042#include "util.h"
David Teiglandb3b94fa2006-01-16 16:50:04 +000043
David Teiglandb3b94fa2006-01-16 16:50:04 +000044/**
45 * gfs2_llseek - seek to a location in a file
46 * @file: the file
47 * @offset: the offset
48 * @origin: Where to seek from (SEEK_SET, SEEK_CUR, or SEEK_END)
49 *
50 * SEEK_END requires the glock for the file because it references the
51 * file's size.
52 *
53 * Returns: The new offset, or errno
54 */
55
56static loff_t gfs2_llseek(struct file *file, loff_t offset, int origin)
57{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -040058 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
David Teiglandb3b94fa2006-01-16 16:50:04 +000059 struct gfs2_holder i_gh;
60 loff_t error;
61
David Teiglandb3b94fa2006-01-16 16:50:04 +000062 if (origin == 2) {
63 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
64 &i_gh);
65 if (!error) {
Andi Kleen9465efc2008-06-27 11:05:24 +020066 error = generic_file_llseek_unlocked(file, offset, origin);
David Teiglandb3b94fa2006-01-16 16:50:04 +000067 gfs2_glock_dq_uninit(&i_gh);
68 }
69 } else
Andi Kleen9465efc2008-06-27 11:05:24 +020070 error = generic_file_llseek_unlocked(file, offset, origin);
David Teiglandb3b94fa2006-01-16 16:50:04 +000071
72 return error;
73}
74
David Teiglandb3b94fa2006-01-16 16:50:04 +000075/**
Steven Whitehousef0e522a2006-09-19 16:41:11 -040076 * gfs2_readdir - Read directory entries from a directory
David Teiglandb3b94fa2006-01-16 16:50:04 +000077 * @file: The directory to read from
78 * @dirent: Buffer for dirents
79 * @filldir: Function used to do the copying
80 *
81 * Returns: errno
82 */
83
Steven Whitehousef0e522a2006-09-19 16:41:11 -040084static int gfs2_readdir(struct file *file, void *dirent, filldir_t filldir)
David Teiglandb3b94fa2006-01-16 16:50:04 +000085{
Steven Whitehouse71b86f52006-03-28 14:14:04 -050086 struct inode *dir = file->f_mapping->host;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -040087 struct gfs2_inode *dip = GFS2_I(dir);
David Teiglandb3b94fa2006-01-16 16:50:04 +000088 struct gfs2_holder d_gh;
Steven Whitehousecd915492006-09-04 12:49:07 -040089 u64 offset = file->f_pos;
David Teiglandb3b94fa2006-01-16 16:50:04 +000090 int error;
91
Steven Whitehouse719ee342008-09-18 13:53:59 +010092 gfs2_holder_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh);
93 error = gfs2_glock_nq(&d_gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +000094 if (error) {
95 gfs2_holder_uninit(&d_gh);
96 return error;
97 }
98
Steven Whitehouse3699e3a2007-01-17 15:09:20 +000099 error = gfs2_dir_read(dir, &offset, dirent, filldir);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000100
101 gfs2_glock_dq_uninit(&d_gh);
102
103 file->f_pos = offset;
104
105 return error;
106}
107
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400108/**
109 * fsflags_cvt
110 * @table: A table of 32 u32 flags
111 * @val: a 32 bit value to convert
112 *
113 * This function can be used to convert between fsflags values and
114 * GFS2's own flags values.
115 *
116 * Returns: the converted flags
117 */
118static u32 fsflags_cvt(const u32 *table, u32 val)
119{
120 u32 res = 0;
121 while(val) {
122 if (val & 1)
123 res |= *table;
124 table++;
125 val >>= 1;
126 }
127 return res;
128}
David Teiglandb3b94fa2006-01-16 16:50:04 +0000129
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400130static const u32 fsflags_to_gfs2[32] = {
131 [3] = GFS2_DIF_SYNC,
132 [4] = GFS2_DIF_IMMUTABLE,
133 [5] = GFS2_DIF_APPENDONLY,
134 [7] = GFS2_DIF_NOATIME,
135 [12] = GFS2_DIF_EXHASH,
Steven Whitehouseb9af7ca2007-07-18 11:40:06 +0100136 [14] = GFS2_DIF_INHERIT_JDATA,
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500137};
138
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400139static const u32 gfs2_to_fsflags[32] = {
140 [gfs2fl_Sync] = FS_SYNC_FL,
141 [gfs2fl_Immutable] = FS_IMMUTABLE_FL,
142 [gfs2fl_AppendOnly] = FS_APPEND_FL,
143 [gfs2fl_NoAtime] = FS_NOATIME_FL,
144 [gfs2fl_ExHash] = FS_INDEX_FL,
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400145 [gfs2fl_InheritJdata] = FS_JOURNAL_DATA_FL,
Steven Whitehouse7ea9ea82006-03-31 15:01:28 -0500146};
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500147
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400148static int gfs2_get_flags(struct file *filp, u32 __user *ptr)
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500149{
Josef Sipek81454092006-12-08 02:37:03 -0800150 struct inode *inode = filp->f_path.dentry->d_inode;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400151 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500152 struct gfs2_holder gh;
153 int error;
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400154 u32 fsflags;
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500155
Steven Whitehouse719ee342008-09-18 13:53:59 +0100156 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
157 error = gfs2_glock_nq(&gh);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500158 if (error)
159 return error;
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400160
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000161 fsflags = fsflags_cvt(gfs2_to_fsflags, ip->i_diskflags);
162 if (!S_ISDIR(inode->i_mode) && ip->i_diskflags & GFS2_DIF_JDATA)
Steven Whitehousec9f6a6b2008-07-10 16:09:29 +0100163 fsflags |= FS_JOURNAL_DATA_FL;
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400164 if (put_user(fsflags, ptr))
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500165 error = -EFAULT;
166
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100167 gfs2_glock_dq(&gh);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500168 gfs2_holder_uninit(&gh);
169 return error;
170}
171
Steven Whitehouse6b124d82006-11-08 12:51:06 -0500172void gfs2_set_inode_flags(struct inode *inode)
173{
174 struct gfs2_inode *ip = GFS2_I(inode);
Steven Whitehouse6b124d82006-11-08 12:51:06 -0500175 unsigned int flags = inode->i_flags;
176
Steven Whitehouse9964afb2011-06-16 14:06:55 +0100177 flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC|S_NOSEC);
178 if ((ip->i_eattr == 0) && !is_sxid(inode->i_mode))
179 inode->i_flags |= S_NOSEC;
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000180 if (ip->i_diskflags & GFS2_DIF_IMMUTABLE)
Steven Whitehouse6b124d82006-11-08 12:51:06 -0500181 flags |= S_IMMUTABLE;
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000182 if (ip->i_diskflags & GFS2_DIF_APPENDONLY)
Steven Whitehouse6b124d82006-11-08 12:51:06 -0500183 flags |= S_APPEND;
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000184 if (ip->i_diskflags & GFS2_DIF_NOATIME)
Steven Whitehouse6b124d82006-11-08 12:51:06 -0500185 flags |= S_NOATIME;
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000186 if (ip->i_diskflags & GFS2_DIF_SYNC)
Steven Whitehouse6b124d82006-11-08 12:51:06 -0500187 flags |= S_SYNC;
188 inode->i_flags = flags;
189}
190
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500191/* Flags that can be set by user space */
192#define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA| \
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500193 GFS2_DIF_IMMUTABLE| \
194 GFS2_DIF_APPENDONLY| \
195 GFS2_DIF_NOATIME| \
196 GFS2_DIF_SYNC| \
197 GFS2_DIF_SYSTEM| \
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500198 GFS2_DIF_INHERIT_JDATA)
199
200/**
201 * gfs2_set_flags - set flags on an inode
202 * @inode: The inode
203 * @flags: The flags to set
204 * @mask: Indicates which flags are valid
205 *
206 */
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400207static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask)
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500208{
Josef Sipek81454092006-12-08 02:37:03 -0800209 struct inode *inode = filp->f_path.dentry->d_inode;
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400210 struct gfs2_inode *ip = GFS2_I(inode);
211 struct gfs2_sbd *sdp = GFS2_SB(inode);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500212 struct buffer_head *bh;
213 struct gfs2_holder gh;
214 int error;
Steven Whitehouse55eccc62006-04-04 14:29:30 -0400215 u32 new_flags, flags;
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500216
Miklos Szeredif58ba882008-07-02 21:12:01 +0200217 error = mnt_want_write(filp->f_path.mnt);
Abhijith Das52f341c2006-07-21 02:03:21 -0400218 if (error)
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500219 return error;
220
Miklos Szeredif58ba882008-07-02 21:12:01 +0200221 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
222 if (error)
223 goto out_drop_write;
224
Steven Whitehouse7df0e032010-05-24 14:36:48 +0100225 error = -EACCES;
Serge E. Hallyn2e149672011-03-23 16:43:26 -0700226 if (!inode_owner_or_capable(inode))
Steven Whitehouse7df0e032010-05-24 14:36:48 +0100227 goto out;
228
229 error = 0;
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000230 flags = ip->i_diskflags;
Steven Whitehouse55eccc62006-04-04 14:29:30 -0400231 new_flags = (flags & ~mask) | (reqflags & mask);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500232 if ((new_flags ^ flags) == 0)
233 goto out;
234
235 error = -EINVAL;
236 if ((new_flags ^ flags) & ~GFS2_FLAGS_USER_SET)
237 goto out;
238
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500239 error = -EPERM;
240 if (IS_IMMUTABLE(inode) && (new_flags & GFS2_DIF_IMMUTABLE))
241 goto out;
242 if (IS_APPEND(inode) && (new_flags & GFS2_DIF_APPENDONLY))
243 goto out;
Steven Whitehouse907b9bc2006-09-25 09:26:04 -0400244 if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) &&
Steven Whitehouseb9cb9812006-05-12 17:07:56 -0400245 !capable(CAP_LINUX_IMMUTABLE))
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500246 goto out;
Steven Whitehouseb9cb9812006-05-12 17:07:56 -0400247 if (!IS_IMMUTABLE(inode)) {
Al Viro10556cb2011-06-20 19:28:19 -0400248 error = gfs2_permission(inode, MAY_WRITE);
Steven Whitehouseb9cb9812006-05-12 17:07:56 -0400249 if (error)
250 goto out;
251 }
Steven Whitehouse55610932007-10-17 08:47:38 +0100252 if ((flags ^ new_flags) & GFS2_DIF_JDATA) {
253 if (flags & GFS2_DIF_JDATA)
254 gfs2_log_flush(sdp, ip->i_gl);
255 error = filemap_fdatawrite(inode->i_mapping);
256 if (error)
257 goto out;
258 error = filemap_fdatawait(inode->i_mapping);
259 if (error)
260 goto out;
261 }
Steven Whitehouse55eccc62006-04-04 14:29:30 -0400262 error = gfs2_trans_begin(sdp, RES_DINODE, 0);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500263 if (error)
264 goto out;
Steven Whitehouse55eccc62006-04-04 14:29:30 -0400265 error = gfs2_meta_inode_buffer(ip, &bh);
266 if (error)
267 goto out_trans_end;
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500268 gfs2_trans_add_bh(ip->i_gl, bh, 1);
Steven Whitehouse383f01f2008-11-04 10:05:22 +0000269 ip->i_diskflags = new_flags;
Steven Whitehouse539e5d62006-10-31 15:07:05 -0500270 gfs2_dinode_out(ip, bh->b_data);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500271 brelse(bh);
Steven Whitehouse6b124d82006-11-08 12:51:06 -0500272 gfs2_set_inode_flags(inode);
Steven Whitehouse55610932007-10-17 08:47:38 +0100273 gfs2_set_aops(inode);
Steven Whitehouse55eccc62006-04-04 14:29:30 -0400274out_trans_end:
275 gfs2_trans_end(sdp);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500276out:
277 gfs2_glock_dq_uninit(&gh);
Miklos Szeredif58ba882008-07-02 21:12:01 +0200278out_drop_write:
279 mnt_drop_write(filp->f_path.mnt);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500280 return error;
281}
282
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400283static int gfs2_set_flags(struct file *filp, u32 __user *ptr)
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500284{
Steven Whitehouseb9af7ca2007-07-18 11:40:06 +0100285 struct inode *inode = filp->f_path.dentry->d_inode;
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400286 u32 fsflags, gfsflags;
Steven Whitehouse7df0e032010-05-24 14:36:48 +0100287
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400288 if (get_user(fsflags, ptr))
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500289 return -EFAULT;
Steven Whitehouse7df0e032010-05-24 14:36:48 +0100290
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400291 gfsflags = fsflags_cvt(fsflags_to_gfs2, fsflags);
Steven Whitehouseb9af7ca2007-07-18 11:40:06 +0100292 if (!S_ISDIR(inode->i_mode)) {
293 if (gfsflags & GFS2_DIF_INHERIT_JDATA)
294 gfsflags ^= (GFS2_DIF_JDATA | GFS2_DIF_INHERIT_JDATA);
Steven Whitehouseb9af7ca2007-07-18 11:40:06 +0100295 return do_gfs2_set_flags(filp, gfsflags, ~0);
296 }
297 return do_gfs2_set_flags(filp, gfsflags, ~GFS2_DIF_JDATA);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500298}
299
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400300static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500301{
302 switch(cmd) {
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400303 case FS_IOC_GETFLAGS:
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400304 return gfs2_get_flags(filp, (u32 __user *)arg);
Steven Whitehouse128e5eb2006-10-02 11:24:43 -0400305 case FS_IOC_SETFLAGS:
Steven Whitehouseb09e5932006-04-07 11:17:32 -0400306 return gfs2_set_flags(filp, (u32 __user *)arg);
Steven Whitehouse71b86f52006-03-28 14:14:04 -0500307 }
308 return -ENOTTY;
309}
310
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100311/**
312 * gfs2_allocate_page_backing - Use bmap to allocate blocks
313 * @page: The (locked) page to allocate backing for
314 *
315 * We try to allocate all the blocks required for the page in
316 * one go. This might fail for various reasons, so we keep
317 * trying until all the blocks to back this page are allocated.
318 * If some of the blocks are already allocated, thats ok too.
319 */
320
321static int gfs2_allocate_page_backing(struct page *page)
322{
323 struct inode *inode = page->mapping->host;
324 struct buffer_head bh;
325 unsigned long size = PAGE_CACHE_SIZE;
326 u64 lblock = page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
327
328 do {
329 bh.b_state = 0;
330 bh.b_size = size;
Bob Petersone9e1ef22007-12-10 14:13:27 -0600331 gfs2_block_map(inode, lblock, &bh, 1);
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100332 if (!buffer_mapped(&bh))
333 return -EIO;
334 size -= bh.b_size;
335 lblock += (bh.b_size >> inode->i_blkbits);
336 } while(size > 0);
337 return 0;
338}
339
340/**
341 * gfs2_page_mkwrite - Make a shared, mmap()ed, page writable
342 * @vma: The virtual memory area
343 * @page: The page which is about to become writable
344 *
345 * When the page becomes writable, we need to ensure that we have
346 * blocks allocated on disk to back that page.
347 */
348
Nick Pigginc2ec1752009-03-31 15:23:21 -0700349static int gfs2_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf)
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100350{
Nick Pigginc2ec1752009-03-31 15:23:21 -0700351 struct page *page = vmf->page;
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100352 struct inode *inode = vma->vm_file->f_path.dentry->d_inode;
353 struct gfs2_inode *ip = GFS2_I(inode);
354 struct gfs2_sbd *sdp = GFS2_SB(inode);
355 unsigned long last_index;
Benjamin Marzinskic8f554b2009-01-06 10:47:50 -0600356 u64 pos = page->index << PAGE_CACHE_SHIFT;
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100357 unsigned int data_blocks, ind_blocks, rblocks;
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100358 struct gfs2_holder gh;
359 struct gfs2_alloc *al;
360 int ret;
361
Steven Whitehouse719ee342008-09-18 13:53:59 +0100362 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh);
363 ret = gfs2_glock_nq(&gh);
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100364 if (ret)
365 goto out;
366
Steven Whitehouse9c538832009-03-19 13:15:44 +0000367 set_bit(GLF_DIRTY, &ip->i_gl->gl_flags);
368 set_bit(GIF_SW_PAGED, &ip->i_flags);
369
Bob Peterson461cb412010-06-24 19:21:20 -0400370 if (!gfs2_write_alloc_required(ip, pos, PAGE_CACHE_SIZE))
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100371 goto out_unlock;
Steven Whitehouse6dbd8222008-01-10 15:18:55 +0000372 ret = -ENOMEM;
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100373 al = gfs2_alloc_get(ip);
Steven Whitehouse6dbd8222008-01-10 15:18:55 +0000374 if (al == NULL)
375 goto out_unlock;
376
Steven Whitehoused82661d2008-03-10 15:34:50 +0000377 ret = gfs2_quota_lock_check(ip);
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100378 if (ret)
379 goto out_alloc_put;
Steven Whitehouse7ed122e2008-12-10 10:28:10 +0000380 gfs2_write_calc_reserv(ip, PAGE_CACHE_SIZE, &data_blocks, &ind_blocks);
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100381 al->al_requested = data_blocks + ind_blocks;
382 ret = gfs2_inplace_reserve(ip);
383 if (ret)
384 goto out_quota_unlock;
385
386 rblocks = RES_DINODE + ind_blocks;
387 if (gfs2_is_jdata(ip))
388 rblocks += data_blocks ? data_blocks : 1;
Benjamin Marzinskibf97b672010-09-27 16:00:04 -0500389 if (ind_blocks || data_blocks) {
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100390 rblocks += RES_STATFS + RES_QUOTA;
Benjamin Marzinskibf97b672010-09-27 16:00:04 -0500391 rblocks += gfs2_rg_blocks(al);
392 }
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100393 ret = gfs2_trans_begin(sdp, rblocks, 0);
394 if (ret)
395 goto out_trans_fail;
396
397 lock_page(page);
398 ret = -EINVAL;
399 last_index = ip->i_inode.i_size >> PAGE_CACHE_SHIFT;
400 if (page->index > last_index)
401 goto out_unlock_page;
Steven Whitehouseb7fe2e32008-01-17 15:12:03 +0000402 ret = 0;
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100403 if (!PageUptodate(page) || page->mapping != ip->i_inode.i_mapping)
404 goto out_unlock_page;
405 if (gfs2_is_stuffed(ip)) {
406 ret = gfs2_unstuff_dinode(ip, page);
407 if (ret)
408 goto out_unlock_page;
409 }
410 ret = gfs2_allocate_page_backing(page);
411
412out_unlock_page:
413 unlock_page(page);
414 gfs2_trans_end(sdp);
415out_trans_fail:
416 gfs2_inplace_release(ip);
417out_quota_unlock:
418 gfs2_quota_unlock(ip);
419out_alloc_put:
420 gfs2_alloc_put(ip);
421out_unlock:
422 gfs2_glock_dq(&gh);
423out:
424 gfs2_holder_uninit(&gh);
Steven Whitehousee56985d2009-04-20 09:45:54 +0100425 if (ret == -ENOMEM)
426 ret = VM_FAULT_OOM;
427 else if (ret)
Nick Pigginc2ec1752009-03-31 15:23:21 -0700428 ret = VM_FAULT_SIGBUS;
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100429 return ret;
430}
431
Alexey Dobriyanf0f37e22009-09-27 22:29:37 +0400432static const struct vm_operations_struct gfs2_vm_ops = {
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100433 .fault = filemap_fault,
434 .page_mkwrite = gfs2_page_mkwrite,
435};
436
David Teiglandb3b94fa2006-01-16 16:50:04 +0000437/**
438 * gfs2_mmap -
439 * @file: The file to map
440 * @vma: The VMA which described the mapping
441 *
Steven Whitehouse48bf2b12009-04-29 13:59:35 +0100442 * There is no need to get a lock here unless we should be updating
443 * atime. We ignore any locking errors since the only consequence is
444 * a missed atime update (which will just be deferred until later).
445 *
446 * Returns: 0
David Teiglandb3b94fa2006-01-16 16:50:04 +0000447 */
448
449static int gfs2_mmap(struct file *file, struct vm_area_struct *vma)
450{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400451 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000452
Steven Whitehouseb9c93bb2011-02-02 14:48:10 +0000453 if (!(file->f_flags & O_NOATIME) &&
454 !IS_NOATIME(&ip->i_inode)) {
Steven Whitehouse48bf2b12009-04-29 13:59:35 +0100455 struct gfs2_holder i_gh;
456 int error;
457
Steven Whitehouseb9c93bb2011-02-02 14:48:10 +0000458 gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
Steven Whitehouse48bf2b12009-04-29 13:59:35 +0100459 error = gfs2_glock_nq(&i_gh);
Steven Whitehouseb9c93bb2011-02-02 14:48:10 +0000460 if (error == 0) {
461 file_accessed(file);
462 gfs2_glock_dq(&i_gh);
463 }
464 gfs2_holder_uninit(&i_gh);
465 if (error)
466 return error;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000467 }
Steven Whitehouse3cc3f712007-10-15 15:40:33 +0100468 vma->vm_ops = &gfs2_vm_ops;
Steven Whitehouse48bf2b12009-04-29 13:59:35 +0100469 vma->vm_flags |= VM_CAN_NONLINEAR;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000470
Steven Whitehouse48bf2b12009-04-29 13:59:35 +0100471 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000472}
473
474/**
475 * gfs2_open - open a file
476 * @inode: the inode to open
477 * @file: the struct file for this opening
478 *
479 * Returns: errno
480 */
481
482static int gfs2_open(struct inode *inode, struct file *file)
483{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400484 struct gfs2_inode *ip = GFS2_I(inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000485 struct gfs2_holder i_gh;
486 struct gfs2_file *fp;
487 int error;
488
David Teiglandb3b94fa2006-01-16 16:50:04 +0000489 fp = kzalloc(sizeof(struct gfs2_file), GFP_KERNEL);
490 if (!fp)
491 return -ENOMEM;
492
Steven Whitehousef55ab262006-02-21 12:51:39 +0000493 mutex_init(&fp->f_fl_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000494
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400495 gfs2_assert_warn(GFS2_SB(inode), !file->private_data);
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500496 file->private_data = fp;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000497
Steven Whitehouseb60623c2006-11-01 12:22:46 -0500498 if (S_ISREG(ip->i_inode.i_mode)) {
David Teiglandb3b94fa2006-01-16 16:50:04 +0000499 error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY,
500 &i_gh);
501 if (error)
502 goto fail;
503
504 if (!(file->f_flags & O_LARGEFILE) &&
Steven Whitehousea2e0f792010-08-11 09:53:11 +0100505 i_size_read(inode) > MAX_NON_LFS) {
Alan Coxa9c62a12007-10-16 23:30:22 -0700506 error = -EOVERFLOW;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000507 goto fail_gunlock;
508 }
509
David Teiglandb3b94fa2006-01-16 16:50:04 +0000510 gfs2_glock_dq_uninit(&i_gh);
511 }
512
513 return 0;
514
Steven Whitehouse420b9e52006-07-31 15:42:17 -0400515fail_gunlock:
David Teiglandb3b94fa2006-01-16 16:50:04 +0000516 gfs2_glock_dq_uninit(&i_gh);
Steven Whitehouse420b9e52006-07-31 15:42:17 -0400517fail:
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500518 file->private_data = NULL;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000519 kfree(fp);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000520 return error;
521}
522
523/**
524 * gfs2_close - called to close a struct file
525 * @inode: the inode the struct file belongs to
526 * @file: the struct file being closed
527 *
528 * Returns: errno
529 */
530
531static int gfs2_close(struct inode *inode, struct file *file)
532{
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500533 struct gfs2_sbd *sdp = inode->i_sb->s_fs_info;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000534 struct gfs2_file *fp;
535
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500536 fp = file->private_data;
537 file->private_data = NULL;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000538
539 if (gfs2_assert_warn(sdp, fp))
540 return -EIO;
541
542 kfree(fp);
543
544 return 0;
545}
546
547/**
548 * gfs2_fsync - sync the dirty data for a file (across the cluster)
Josef Bacik02c24a82011-07-16 20:44:56 -0400549 * @file: the file that points to the dentry
550 * @start: the start position in the file to sync
551 * @end: the end position in the file to sync
Steven Whitehousedba898b2011-04-14 09:54:02 +0100552 * @datasync: set if we can ignore timestamp changes
David Teiglandb3b94fa2006-01-16 16:50:04 +0000553 *
Steven Whitehousedba898b2011-04-14 09:54:02 +0100554 * The VFS will flush data for us. We only need to worry
555 * about metadata here.
Steven Whitehouse34126f92006-12-07 09:13:14 -0500556 *
David Teiglandb3b94fa2006-01-16 16:50:04 +0000557 * Returns: errno
558 */
559
Josef Bacik02c24a82011-07-16 20:44:56 -0400560static int gfs2_fsync(struct file *file, loff_t start, loff_t end,
561 int datasync)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000562{
Christoph Hellwig7ea80852010-05-26 17:53:25 +0200563 struct inode *inode = file->f_mapping->host;
Steven Whitehouse33c3de32006-11-30 10:14:32 -0500564 int sync_state = inode->i_state & (I_DIRTY_SYNC|I_DIRTY_DATASYNC);
Steven Whitehousedba898b2011-04-14 09:54:02 +0100565 struct gfs2_inode *ip = GFS2_I(inode);
566 int ret;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000567
Josef Bacik02c24a82011-07-16 20:44:56 -0400568 ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
569 if (ret)
570 return ret;
571 mutex_lock(&inode->i_mutex);
572
Steven Whitehousedba898b2011-04-14 09:54:02 +0100573 if (datasync)
574 sync_state &= ~I_DIRTY_SYNC;
575
576 if (sync_state) {
577 ret = sync_inode_metadata(inode, 1);
Josef Bacik02c24a82011-07-16 20:44:56 -0400578 if (ret) {
579 mutex_unlock(&inode->i_mutex);
Steven Whitehousedba898b2011-04-14 09:54:02 +0100580 return ret;
Josef Bacik02c24a82011-07-16 20:44:56 -0400581 }
Steven Whitehousedba898b2011-04-14 09:54:02 +0100582 gfs2_ail_flush(ip->i_gl);
Steven Whitehouse33c3de32006-11-30 10:14:32 -0500583 }
David Teiglandb3b94fa2006-01-16 16:50:04 +0000584
Josef Bacik02c24a82011-07-16 20:44:56 -0400585 mutex_unlock(&inode->i_mutex);
Steven Whitehousedba898b2011-04-14 09:54:02 +0100586 return 0;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000587}
588
Steven Whitehouse56aa6162009-12-08 10:25:33 +0000589/**
590 * gfs2_file_aio_write - Perform a write to a file
591 * @iocb: The io context
592 * @iov: The data to write
593 * @nr_segs: Number of @iov segments
594 * @pos: The file position
595 *
596 * We have to do a lock/unlock here to refresh the inode size for
597 * O_APPEND writes, otherwise we can land up writing at the wrong
598 * offset. There is still a race, but provided the app is using its
599 * own file locking, this will make O_APPEND work as expected.
600 *
601 */
602
603static ssize_t gfs2_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
604 unsigned long nr_segs, loff_t pos)
605{
606 struct file *file = iocb->ki_filp;
607
608 if (file->f_flags & O_APPEND) {
609 struct dentry *dentry = file->f_dentry;
610 struct gfs2_inode *ip = GFS2_I(dentry->d_inode);
611 struct gfs2_holder gh;
612 int ret;
613
614 ret = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, 0, &gh);
615 if (ret)
616 return ret;
617 gfs2_glock_dq_uninit(&gh);
618 }
619
620 return generic_file_aio_write(iocb, iov, nr_segs, pos);
621}
622
Benjamin Marzinski0ee53202011-03-17 21:54:46 -0500623static int empty_write_end(struct page *page, unsigned from,
624 unsigned to, int mode)
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100625{
Benjamin Marzinski0ee53202011-03-17 21:54:46 -0500626 struct inode *inode = page->mapping->host;
627 struct gfs2_inode *ip = GFS2_I(inode);
628 struct buffer_head *bh;
629 unsigned offset, blksize = 1 << inode->i_blkbits;
630 pgoff_t end_index = i_size_read(inode) >> PAGE_CACHE_SHIFT;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100631
Benjamin Marzinskie4a7b7b2011-03-11 00:49:09 -0600632 zero_user(page, from, to-from);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100633 mark_page_accessed(page);
634
Benjamin Marzinski0ee53202011-03-17 21:54:46 -0500635 if (page->index < end_index || !(mode & FALLOC_FL_KEEP_SIZE)) {
636 if (!gfs2_is_writeback(ip))
637 gfs2_page_add_databufs(ip, page, from, to);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100638
Benjamin Marzinski0ee53202011-03-17 21:54:46 -0500639 block_commit_write(page, from, to);
640 return 0;
641 }
642
643 offset = 0;
644 bh = page_buffers(page);
645 while (offset < to) {
646 if (offset >= from) {
647 set_buffer_uptodate(bh);
648 mark_buffer_dirty(bh);
649 clear_buffer_new(bh);
650 write_dirty_buffer(bh, WRITE);
651 }
652 offset += blksize;
653 bh = bh->b_this_page;
654 }
655
656 offset = 0;
657 bh = page_buffers(page);
658 while (offset < to) {
659 if (offset >= from) {
660 wait_on_buffer(bh);
661 if (!buffer_uptodate(bh))
662 return -EIO;
663 }
664 offset += blksize;
665 bh = bh->b_this_page;
666 }
667 return 0;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100668}
669
Benjamin Marzinskie4a7b7b2011-03-11 00:49:09 -0600670static int needs_empty_write(sector_t block, struct inode *inode)
671{
672 int error;
673 struct buffer_head bh_map = { .b_state = 0, .b_blocknr = 0 };
674
675 bh_map.b_size = 1 << inode->i_blkbits;
676 error = gfs2_block_map(inode, block, &bh_map, 0);
677 if (unlikely(error))
678 return error;
679 return !buffer_mapped(&bh_map);
680}
681
Benjamin Marzinski0ee53202011-03-17 21:54:46 -0500682static int write_empty_blocks(struct page *page, unsigned from, unsigned to,
683 int mode)
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100684{
Benjamin Marzinskie4a7b7b2011-03-11 00:49:09 -0600685 struct inode *inode = page->mapping->host;
686 unsigned start, end, next, blksize;
687 sector_t block = page->index << (PAGE_CACHE_SHIFT - inode->i_blkbits);
688 int ret;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100689
Benjamin Marzinskie4a7b7b2011-03-11 00:49:09 -0600690 blksize = 1 << inode->i_blkbits;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100691 next = end = 0;
692 while (next < from) {
Benjamin Marzinskie4a7b7b2011-03-11 00:49:09 -0600693 next += blksize;
694 block++;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100695 }
696 start = next;
697 do {
Benjamin Marzinskie4a7b7b2011-03-11 00:49:09 -0600698 next += blksize;
699 ret = needs_empty_write(block, inode);
700 if (unlikely(ret < 0))
701 return ret;
702 if (ret == 0) {
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100703 if (end) {
Benjamin Marzinskie4a7b7b2011-03-11 00:49:09 -0600704 ret = __block_write_begin(page, start, end - start,
705 gfs2_block_map);
706 if (unlikely(ret))
707 return ret;
Benjamin Marzinski0ee53202011-03-17 21:54:46 -0500708 ret = empty_write_end(page, start, end, mode);
709 if (unlikely(ret))
710 return ret;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100711 end = 0;
712 }
713 start = next;
714 }
715 else
716 end = next;
Benjamin Marzinskie4a7b7b2011-03-11 00:49:09 -0600717 block++;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100718 } while (next < to);
719
720 if (end) {
Benjamin Marzinskie4a7b7b2011-03-11 00:49:09 -0600721 ret = __block_write_begin(page, start, end - start, gfs2_block_map);
722 if (unlikely(ret))
723 return ret;
Benjamin Marzinski0ee53202011-03-17 21:54:46 -0500724 ret = empty_write_end(page, start, end, mode);
725 if (unlikely(ret))
726 return ret;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100727 }
728
729 return 0;
730}
731
732static int fallocate_chunk(struct inode *inode, loff_t offset, loff_t len,
733 int mode)
734{
735 struct gfs2_inode *ip = GFS2_I(inode);
736 struct buffer_head *dibh;
737 int error;
738 u64 start = offset >> PAGE_CACHE_SHIFT;
739 unsigned int start_offset = offset & ~PAGE_CACHE_MASK;
740 u64 end = (offset + len - 1) >> PAGE_CACHE_SHIFT;
741 pgoff_t curr;
742 struct page *page;
743 unsigned int end_offset = (offset + len) & ~PAGE_CACHE_MASK;
744 unsigned int from, to;
745
746 if (!end_offset)
747 end_offset = PAGE_CACHE_SIZE;
748
749 error = gfs2_meta_inode_buffer(ip, &dibh);
750 if (unlikely(error))
751 goto out;
752
753 gfs2_trans_add_bh(ip->i_gl, dibh, 1);
754
755 if (gfs2_is_stuffed(ip)) {
756 error = gfs2_unstuff_dinode(ip, NULL);
757 if (unlikely(error))
758 goto out;
759 }
760
761 curr = start;
762 offset = start << PAGE_CACHE_SHIFT;
763 from = start_offset;
764 to = PAGE_CACHE_SIZE;
765 while (curr <= end) {
766 page = grab_cache_page_write_begin(inode->i_mapping, curr,
767 AOP_FLAG_NOFS);
768 if (unlikely(!page)) {
769 error = -ENOMEM;
770 goto out;
771 }
772
773 if (curr == end)
774 to = end_offset;
Benjamin Marzinski0ee53202011-03-17 21:54:46 -0500775 error = write_empty_blocks(page, from, to, mode);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100776 if (!error && offset + to > inode->i_size &&
777 !(mode & FALLOC_FL_KEEP_SIZE)) {
778 i_size_write(inode, offset + to);
779 }
780 unlock_page(page);
781 page_cache_release(page);
782 if (error)
783 goto out;
784 curr++;
785 offset += PAGE_CACHE_SIZE;
786 from = 0;
787 }
788
789 gfs2_dinode_out(ip, dibh->b_data);
790 mark_inode_dirty(inode);
791
792 brelse(dibh);
793
794out:
795 return error;
796}
797
798static void calc_max_reserv(struct gfs2_inode *ip, loff_t max, loff_t *len,
799 unsigned int *data_blocks, unsigned int *ind_blocks)
800{
801 const struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
802 unsigned int max_blocks = ip->i_alloc->al_rgd->rd_free_clone;
803 unsigned int tmp, max_data = max_blocks - 3 * (sdp->sd_max_height - 1);
804
805 for (tmp = max_data; tmp > sdp->sd_diptrs;) {
806 tmp = DIV_ROUND_UP(tmp, sdp->sd_inptrs);
807 max_data -= tmp;
808 }
809 /* This calculation isn't the exact reverse of gfs2_write_calc_reserve,
810 so it might end up with fewer data blocks */
811 if (max_data <= *data_blocks)
812 return;
813 *data_blocks = max_data;
814 *ind_blocks = max_blocks - max_data;
815 *len = ((loff_t)max_data - 3) << sdp->sd_sb.sb_bsize_shift;
816 if (*len > max) {
817 *len = max;
818 gfs2_write_calc_reserv(ip, max, data_blocks, ind_blocks);
819 }
820}
821
822static long gfs2_fallocate(struct file *file, int mode, loff_t offset,
823 loff_t len)
824{
825 struct inode *inode = file->f_path.dentry->d_inode;
826 struct gfs2_sbd *sdp = GFS2_SB(inode);
827 struct gfs2_inode *ip = GFS2_I(inode);
828 unsigned int data_blocks = 0, ind_blocks = 0, rblocks;
829 loff_t bytes, max_bytes;
830 struct gfs2_alloc *al;
831 int error;
Benjamin Marzinski6905d9e2011-04-26 01:13:24 -0500832 loff_t bsize_mask = ~((loff_t)sdp->sd_sb.sb_bsize - 1);
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100833 loff_t next = (offset + len - 1) >> sdp->sd_sb.sb_bsize_shift;
834 next = (next + 1) << sdp->sd_sb.sb_bsize_shift;
835
836 /* We only support the FALLOC_FL_KEEP_SIZE mode */
837 if (mode & ~FALLOC_FL_KEEP_SIZE)
838 return -EOPNOTSUPP;
839
Benjamin Marzinski6905d9e2011-04-26 01:13:24 -0500840 offset &= bsize_mask;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100841
842 len = next - offset;
843 bytes = sdp->sd_max_rg_data * sdp->sd_sb.sb_bsize / 2;
844 if (!bytes)
845 bytes = UINT_MAX;
Benjamin Marzinski6905d9e2011-04-26 01:13:24 -0500846 bytes &= bsize_mask;
847 if (bytes == 0)
848 bytes = sdp->sd_sb.sb_bsize;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100849
850 gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &ip->i_gh);
851 error = gfs2_glock_nq(&ip->i_gh);
852 if (unlikely(error))
853 goto out_uninit;
854
855 if (!gfs2_write_alloc_required(ip, offset, len))
856 goto out_unlock;
857
858 while (len > 0) {
859 if (len < bytes)
860 bytes = len;
861 al = gfs2_alloc_get(ip);
862 if (!al) {
863 error = -ENOMEM;
864 goto out_unlock;
865 }
866
867 error = gfs2_quota_lock_check(ip);
868 if (error)
869 goto out_alloc_put;
870
871retry:
872 gfs2_write_calc_reserv(ip, bytes, &data_blocks, &ind_blocks);
873
874 al->al_requested = data_blocks + ind_blocks;
875 error = gfs2_inplace_reserve(ip);
876 if (error) {
877 if (error == -ENOSPC && bytes > sdp->sd_sb.sb_bsize) {
878 bytes >>= 1;
Benjamin Marzinski6905d9e2011-04-26 01:13:24 -0500879 bytes &= bsize_mask;
880 if (bytes == 0)
881 bytes = sdp->sd_sb.sb_bsize;
Christoph Hellwig2fe17c12011-01-14 13:07:43 +0100882 goto retry;
883 }
884 goto out_qunlock;
885 }
886 max_bytes = bytes;
887 calc_max_reserv(ip, len, &max_bytes, &data_blocks, &ind_blocks);
888 al->al_requested = data_blocks + ind_blocks;
889
890 rblocks = RES_DINODE + ind_blocks + RES_STATFS + RES_QUOTA +
891 RES_RG_HDR + gfs2_rg_blocks(al);
892 if (gfs2_is_jdata(ip))
893 rblocks += data_blocks ? data_blocks : 1;
894
895 error = gfs2_trans_begin(sdp, rblocks,
896 PAGE_CACHE_SIZE/sdp->sd_sb.sb_bsize);
897 if (error)
898 goto out_trans_fail;
899
900 error = fallocate_chunk(inode, offset, max_bytes, mode);
901 gfs2_trans_end(sdp);
902
903 if (error)
904 goto out_trans_fail;
905
906 len -= max_bytes;
907 offset += max_bytes;
908 gfs2_inplace_release(ip);
909 gfs2_quota_unlock(ip);
910 gfs2_alloc_put(ip);
911 }
912 goto out_unlock;
913
914out_trans_fail:
915 gfs2_inplace_release(ip);
916out_qunlock:
917 gfs2_quota_unlock(ip);
918out_alloc_put:
919 gfs2_alloc_put(ip);
920out_unlock:
921 gfs2_glock_dq(&ip->i_gh);
922out_uninit:
923 gfs2_holder_uninit(&ip->i_gh);
924 return error;
925}
926
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000927#ifdef CONFIG_GFS2_FS_LOCKING_DLM
928
David Teiglandb3b94fa2006-01-16 16:50:04 +0000929/**
Marc Eshel60446062007-01-15 18:33:36 -0500930 * gfs2_setlease - acquire/release a file lease
931 * @file: the file pointer
932 * @arg: lease type
933 * @fl: file lock
934 *
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000935 * We don't currently have a way to enforce a lease across the whole
936 * cluster; until we do, disable leases (by just returning -EINVAL),
937 * unless the administrator has requested purely local locking.
938 *
Arnd Bergmannb89f4322010-09-18 15:09:31 +0200939 * Locking: called under lock_flocks
940 *
Marc Eshel60446062007-01-15 18:33:36 -0500941 * Returns: errno
942 */
943
944static int gfs2_setlease(struct file *file, long arg, struct file_lock **fl)
945{
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000946 return -EINVAL;
Steven Whitehouseda755fd2008-01-30 15:34:04 +0000947}
948
Marc Eshel60446062007-01-15 18:33:36 -0500949/**
David Teiglandb3b94fa2006-01-16 16:50:04 +0000950 * gfs2_lock - acquire/release a posix lock on a file
951 * @file: the file pointer
952 * @cmd: either modify or retrieve lock state, possibly wait
953 * @fl: type and range of lock
954 *
955 * Returns: errno
956 */
957
958static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl)
959{
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -0400960 struct gfs2_inode *ip = GFS2_I(file->f_mapping->host);
961 struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host);
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000962 struct lm_lockstruct *ls = &sdp->sd_lockstruct;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000963
David Teiglandb3b94fa2006-01-16 16:50:04 +0000964 if (!(fl->fl_flags & FL_POSIX))
965 return -ENOLCK;
Sachin Prabhu720e7742010-03-11 12:24:45 -0500966 if (__mandatory_lock(&ip->i_inode) && fl->fl_type != F_UNLCK)
David Teiglandb3b94fa2006-01-16 16:50:04 +0000967 return -ENOLCK;
968
Marc Eshel586759f2006-11-14 16:37:25 -0500969 if (cmd == F_CANCELLK) {
970 /* Hack: */
971 cmd = F_SETLK;
972 fl->fl_type = F_UNLCK;
973 }
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000974 if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags)))
975 return -EIO;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000976 if (IS_GETLK(cmd))
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000977 return dlm_posix_get(ls->ls_dlm, ip->i_no_addr, file, fl);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000978 else if (fl->fl_type == F_UNLCK)
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000979 return dlm_posix_unlock(ls->ls_dlm, ip->i_no_addr, file, fl);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000980 else
Steven Whitehousef057f6c2009-01-12 10:43:39 +0000981 return dlm_posix_lock(ls->ls_dlm, ip->i_no_addr, file, cmd, fl);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000982}
983
David Teiglandb3b94fa2006-01-16 16:50:04 +0000984static int do_flock(struct file *file, int cmd, struct file_lock *fl)
985{
Steven Whitehouse5c676f62006-02-27 17:23:27 -0500986 struct gfs2_file *fp = file->private_data;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000987 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
Josef Sipek81454092006-12-08 02:37:03 -0800988 struct gfs2_inode *ip = GFS2_I(file->f_path.dentry->d_inode);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000989 struct gfs2_glock *gl;
990 unsigned int state;
991 int flags;
992 int error = 0;
993
994 state = (fl->fl_type == F_WRLCK) ? LM_ST_EXCLUSIVE : LM_ST_SHARED;
Steven Whitehouse6802e342008-05-21 17:03:22 +0100995 flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY) | GL_EXACT | GL_NOCACHE;
David Teiglandb3b94fa2006-01-16 16:50:04 +0000996
Steven Whitehousef55ab262006-02-21 12:51:39 +0000997 mutex_lock(&fp->f_fl_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +0000998
999 gl = fl_gh->gh_gl;
1000 if (gl) {
1001 if (fl_gh->gh_state == state)
1002 goto out;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001003 flock_lock_file_wait(file,
Steven Whitehouse907b9bc2006-09-25 09:26:04 -04001004 &(struct file_lock){.fl_type = F_UNLCK});
Abhijith Dasb4c20162007-09-13 23:35:27 -05001005 gfs2_glock_dq_wait(fl_gh);
1006 gfs2_holder_reinit(state, flags, fl_gh);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001007 } else {
Steven Whitehouse6802e342008-05-21 17:03:22 +01001008 error = gfs2_glock_get(GFS2_SB(&ip->i_inode), ip->i_no_addr,
1009 &gfs2_flock_glops, CREATE, &gl);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001010 if (error)
1011 goto out;
Abhijith Dasb4c20162007-09-13 23:35:27 -05001012 gfs2_holder_init(gl, state, flags, fl_gh);
1013 gfs2_glock_put(gl);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001014 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001015 error = gfs2_glock_nq(fl_gh);
1016 if (error) {
1017 gfs2_holder_uninit(fl_gh);
1018 if (error == GLR_TRYFAILED)
1019 error = -EAGAIN;
1020 } else {
1021 error = flock_lock_file_wait(file, fl);
Steven Whitehousefeaa7bb2006-06-14 15:32:57 -04001022 gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001023 }
1024
Steven Whitehouse420b9e52006-07-31 15:42:17 -04001025out:
Steven Whitehousef55ab262006-02-21 12:51:39 +00001026 mutex_unlock(&fp->f_fl_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001027 return error;
1028}
1029
1030static void do_unflock(struct file *file, struct file_lock *fl)
1031{
Steven Whitehouse5c676f62006-02-27 17:23:27 -05001032 struct gfs2_file *fp = file->private_data;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001033 struct gfs2_holder *fl_gh = &fp->f_fl_gh;
1034
Steven Whitehousef55ab262006-02-21 12:51:39 +00001035 mutex_lock(&fp->f_fl_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001036 flock_lock_file_wait(file, fl);
Steven Whitehouse0a334432011-03-09 11:14:32 +00001037 if (fl_gh->gh_gl) {
1038 gfs2_glock_dq_wait(fl_gh);
1039 gfs2_holder_uninit(fl_gh);
1040 }
Steven Whitehousef55ab262006-02-21 12:51:39 +00001041 mutex_unlock(&fp->f_fl_mutex);
David Teiglandb3b94fa2006-01-16 16:50:04 +00001042}
1043
1044/**
1045 * gfs2_flock - acquire/release a flock lock on a file
1046 * @file: the file pointer
1047 * @cmd: either modify or retrieve lock state, possibly wait
1048 * @fl: type and range of lock
1049 *
1050 * Returns: errno
1051 */
1052
1053static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl)
1054{
David Teiglandb3b94fa2006-01-16 16:50:04 +00001055 if (!(fl->fl_flags & FL_FLOCK))
1056 return -ENOLCK;
Abhijith Dasa12af1e2009-06-01 12:30:03 -05001057 if (fl->fl_type & LOCK_MAND)
1058 return -EOPNOTSUPP;
David Teiglandb3b94fa2006-01-16 16:50:04 +00001059
David Teiglandb3b94fa2006-01-16 16:50:04 +00001060 if (fl->fl_type == F_UNLCK) {
1061 do_unflock(file, fl);
1062 return 0;
Steven Whitehoused00223f2006-10-02 10:28:05 -04001063 } else {
David Teiglandb3b94fa2006-01-16 16:50:04 +00001064 return do_flock(file, cmd, fl);
Steven Whitehoused00223f2006-10-02 10:28:05 -04001065 }
David Teiglandb3b94fa2006-01-16 16:50:04 +00001066}
1067
Christoph Hellwig10d21982009-04-07 19:42:17 +02001068const struct file_operations gfs2_file_fops = {
Steven Whitehouse26c1a572006-09-04 15:32:10 -04001069 .llseek = gfs2_llseek,
Steven Whitehoused00223f2006-10-02 10:28:05 -04001070 .read = do_sync_read,
Steven Whitehouse26c1a572006-09-04 15:32:10 -04001071 .aio_read = generic_file_aio_read,
Steven Whitehoused00223f2006-10-02 10:28:05 -04001072 .write = do_sync_write,
Steven Whitehouse56aa6162009-12-08 10:25:33 +00001073 .aio_write = gfs2_file_aio_write,
Steven Whitehouse26c1a572006-09-04 15:32:10 -04001074 .unlocked_ioctl = gfs2_ioctl,
1075 .mmap = gfs2_mmap,
1076 .open = gfs2_open,
1077 .release = gfs2_close,
1078 .fsync = gfs2_fsync,
1079 .lock = gfs2_lock,
Steven Whitehouse26c1a572006-09-04 15:32:10 -04001080 .flock = gfs2_flock,
1081 .splice_read = generic_file_splice_read,
1082 .splice_write = generic_file_splice_write,
Marc Eshel60446062007-01-15 18:33:36 -05001083 .setlease = gfs2_setlease,
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01001084 .fallocate = gfs2_fallocate,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001085};
1086
Christoph Hellwig10d21982009-04-07 19:42:17 +02001087const struct file_operations gfs2_dir_fops = {
Steven Whitehouse26c1a572006-09-04 15:32:10 -04001088 .readdir = gfs2_readdir,
1089 .unlocked_ioctl = gfs2_ioctl,
1090 .open = gfs2_open,
1091 .release = gfs2_close,
1092 .fsync = gfs2_fsync,
1093 .lock = gfs2_lock,
1094 .flock = gfs2_flock,
Arnd Bergmann6038f372010-08-15 18:52:59 +02001095 .llseek = default_llseek,
David Teiglandb3b94fa2006-01-16 16:50:04 +00001096};
1097
Steven Whitehousef057f6c2009-01-12 10:43:39 +00001098#endif /* CONFIG_GFS2_FS_LOCKING_DLM */
1099
Christoph Hellwig10d21982009-04-07 19:42:17 +02001100const struct file_operations gfs2_file_fops_nolock = {
Wendy Chengc97bfe42007-11-29 17:56:51 -05001101 .llseek = gfs2_llseek,
1102 .read = do_sync_read,
1103 .aio_read = generic_file_aio_read,
1104 .write = do_sync_write,
Steven Whitehouse56aa6162009-12-08 10:25:33 +00001105 .aio_write = gfs2_file_aio_write,
Wendy Chengc97bfe42007-11-29 17:56:51 -05001106 .unlocked_ioctl = gfs2_ioctl,
1107 .mmap = gfs2_mmap,
1108 .open = gfs2_open,
1109 .release = gfs2_close,
1110 .fsync = gfs2_fsync,
1111 .splice_read = generic_file_splice_read,
1112 .splice_write = generic_file_splice_write,
Steven Whitehousef057f6c2009-01-12 10:43:39 +00001113 .setlease = generic_setlease,
Christoph Hellwig2fe17c12011-01-14 13:07:43 +01001114 .fallocate = gfs2_fallocate,
Wendy Chengc97bfe42007-11-29 17:56:51 -05001115};
1116
Christoph Hellwig10d21982009-04-07 19:42:17 +02001117const struct file_operations gfs2_dir_fops_nolock = {
Wendy Chengc97bfe42007-11-29 17:56:51 -05001118 .readdir = gfs2_readdir,
1119 .unlocked_ioctl = gfs2_ioctl,
1120 .open = gfs2_open,
1121 .release = gfs2_close,
1122 .fsync = gfs2_fsync,
Arnd Bergmann6038f372010-08-15 18:52:59 +02001123 .llseek = default_llseek,
Wendy Chengc97bfe42007-11-29 17:56:51 -05001124};
1125