David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1 | /* |
| 2 | * Copyright (C) Sistina Software, Inc. 1997-2003 All rights reserved. |
Steven Whitehouse | 3a8a9a1 | 2006-05-18 15:09:15 -0400 | [diff] [blame] | 3 | * Copyright (C) 2004-2006 Red Hat, Inc. All rights reserved. |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 4 | * |
| 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 Whitehouse | e9fc2aa | 2006-09-01 11:05:15 -0400 | [diff] [blame] | 7 | * of the GNU General Public License version 2. |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 8 | */ |
| 9 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 10 | #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 Szeredi | f58ba88 | 2008-07-02 21:12:01 +0200 | [diff] [blame] | 18 | #include <linux/mount.h> |
Steven Whitehouse | 18ec7d5 | 2006-02-08 11:50:51 +0000 | [diff] [blame] | 19 | #include <linux/fs.h> |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 20 | #include <linux/gfs2_ondisk.h> |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 21 | #include <linux/ext2_fs.h> |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 22 | #include <linux/falloc.h> |
| 23 | #include <linux/swap.h> |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 24 | #include <linux/crc32.h> |
Steven Whitehouse | 33c3de3 | 2006-11-30 10:14:32 -0500 | [diff] [blame] | 25 | #include <linux/writeback.h> |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 26 | #include <asm/uaccess.h> |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 27 | #include <linux/dlm.h> |
| 28 | #include <linux/dlm_plock.h> |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 29 | |
| 30 | #include "gfs2.h" |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 31 | #include "incore.h" |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 32 | #include "bmap.h" |
| 33 | #include "dir.h" |
| 34 | #include "glock.h" |
| 35 | #include "glops.h" |
| 36 | #include "inode.h" |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 37 | #include "log.h" |
| 38 | #include "meta_io.h" |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 39 | #include "quota.h" |
| 40 | #include "rgrp.h" |
| 41 | #include "trans.h" |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 42 | #include "util.h" |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 43 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 44 | /** |
| 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 | |
| 56 | static loff_t gfs2_llseek(struct file *file, loff_t offset, int origin) |
| 57 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 58 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 59 | struct gfs2_holder i_gh; |
| 60 | loff_t error; |
| 61 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 62 | 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 Kleen | 9465efc | 2008-06-27 11:05:24 +0200 | [diff] [blame] | 66 | error = generic_file_llseek_unlocked(file, offset, origin); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 67 | gfs2_glock_dq_uninit(&i_gh); |
| 68 | } |
| 69 | } else |
Andi Kleen | 9465efc | 2008-06-27 11:05:24 +0200 | [diff] [blame] | 70 | error = generic_file_llseek_unlocked(file, offset, origin); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 71 | |
| 72 | return error; |
| 73 | } |
| 74 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 75 | /** |
Steven Whitehouse | f0e522a | 2006-09-19 16:41:11 -0400 | [diff] [blame] | 76 | * gfs2_readdir - Read directory entries from a directory |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 77 | * @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 Whitehouse | f0e522a | 2006-09-19 16:41:11 -0400 | [diff] [blame] | 84 | static int gfs2_readdir(struct file *file, void *dirent, filldir_t filldir) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 85 | { |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 86 | struct inode *dir = file->f_mapping->host; |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 87 | struct gfs2_inode *dip = GFS2_I(dir); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 88 | struct gfs2_holder d_gh; |
Steven Whitehouse | cd91549 | 2006-09-04 12:49:07 -0400 | [diff] [blame] | 89 | u64 offset = file->f_pos; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 90 | int error; |
| 91 | |
Steven Whitehouse | 719ee34 | 2008-09-18 13:53:59 +0100 | [diff] [blame] | 92 | gfs2_holder_init(dip->i_gl, LM_ST_SHARED, 0, &d_gh); |
| 93 | error = gfs2_glock_nq(&d_gh); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 94 | if (error) { |
| 95 | gfs2_holder_uninit(&d_gh); |
| 96 | return error; |
| 97 | } |
| 98 | |
Steven Whitehouse | 3699e3a | 2007-01-17 15:09:20 +0000 | [diff] [blame] | 99 | error = gfs2_dir_read(dir, &offset, dirent, filldir); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 100 | |
| 101 | gfs2_glock_dq_uninit(&d_gh); |
| 102 | |
| 103 | file->f_pos = offset; |
| 104 | |
| 105 | return error; |
| 106 | } |
| 107 | |
Steven Whitehouse | 128e5eb | 2006-10-02 11:24:43 -0400 | [diff] [blame] | 108 | /** |
| 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 | */ |
| 118 | static 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 Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 129 | |
Steven Whitehouse | 128e5eb | 2006-10-02 11:24:43 -0400 | [diff] [blame] | 130 | static 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 Whitehouse | b9af7ca | 2007-07-18 11:40:06 +0100 | [diff] [blame] | 136 | [14] = GFS2_DIF_INHERIT_JDATA, |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 137 | }; |
| 138 | |
Steven Whitehouse | 128e5eb | 2006-10-02 11:24:43 -0400 | [diff] [blame] | 139 | static 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 Whitehouse | 128e5eb | 2006-10-02 11:24:43 -0400 | [diff] [blame] | 145 | [gfs2fl_InheritJdata] = FS_JOURNAL_DATA_FL, |
Steven Whitehouse | 7ea9ea8 | 2006-03-31 15:01:28 -0500 | [diff] [blame] | 146 | }; |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 147 | |
Steven Whitehouse | b09e593 | 2006-04-07 11:17:32 -0400 | [diff] [blame] | 148 | static int gfs2_get_flags(struct file *filp, u32 __user *ptr) |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 149 | { |
Josef Sipek | 8145409 | 2006-12-08 02:37:03 -0800 | [diff] [blame] | 150 | struct inode *inode = filp->f_path.dentry->d_inode; |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 151 | struct gfs2_inode *ip = GFS2_I(inode); |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 152 | struct gfs2_holder gh; |
| 153 | int error; |
Steven Whitehouse | 128e5eb | 2006-10-02 11:24:43 -0400 | [diff] [blame] | 154 | u32 fsflags; |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 155 | |
Steven Whitehouse | 719ee34 | 2008-09-18 13:53:59 +0100 | [diff] [blame] | 156 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, 0, &gh); |
| 157 | error = gfs2_glock_nq(&gh); |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 158 | if (error) |
| 159 | return error; |
Steven Whitehouse | 907b9bc | 2006-09-25 09:26:04 -0400 | [diff] [blame] | 160 | |
Steven Whitehouse | 383f01f | 2008-11-04 10:05:22 +0000 | [diff] [blame] | 161 | fsflags = fsflags_cvt(gfs2_to_fsflags, ip->i_diskflags); |
| 162 | if (!S_ISDIR(inode->i_mode) && ip->i_diskflags & GFS2_DIF_JDATA) |
Steven Whitehouse | c9f6a6b | 2008-07-10 16:09:29 +0100 | [diff] [blame] | 163 | fsflags |= FS_JOURNAL_DATA_FL; |
Steven Whitehouse | 128e5eb | 2006-10-02 11:24:43 -0400 | [diff] [blame] | 164 | if (put_user(fsflags, ptr)) |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 165 | error = -EFAULT; |
| 166 | |
Steven Whitehouse | 3cc3f71 | 2007-10-15 15:40:33 +0100 | [diff] [blame] | 167 | gfs2_glock_dq(&gh); |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 168 | gfs2_holder_uninit(&gh); |
| 169 | return error; |
| 170 | } |
| 171 | |
Steven Whitehouse | 6b124d8 | 2006-11-08 12:51:06 -0500 | [diff] [blame] | 172 | void gfs2_set_inode_flags(struct inode *inode) |
| 173 | { |
| 174 | struct gfs2_inode *ip = GFS2_I(inode); |
Steven Whitehouse | 6b124d8 | 2006-11-08 12:51:06 -0500 | [diff] [blame] | 175 | unsigned int flags = inode->i_flags; |
| 176 | |
| 177 | flags &= ~(S_SYNC|S_APPEND|S_IMMUTABLE|S_NOATIME|S_DIRSYNC); |
Steven Whitehouse | 383f01f | 2008-11-04 10:05:22 +0000 | [diff] [blame] | 178 | if (ip->i_diskflags & GFS2_DIF_IMMUTABLE) |
Steven Whitehouse | 6b124d8 | 2006-11-08 12:51:06 -0500 | [diff] [blame] | 179 | flags |= S_IMMUTABLE; |
Steven Whitehouse | 383f01f | 2008-11-04 10:05:22 +0000 | [diff] [blame] | 180 | if (ip->i_diskflags & GFS2_DIF_APPENDONLY) |
Steven Whitehouse | 6b124d8 | 2006-11-08 12:51:06 -0500 | [diff] [blame] | 181 | flags |= S_APPEND; |
Steven Whitehouse | 383f01f | 2008-11-04 10:05:22 +0000 | [diff] [blame] | 182 | if (ip->i_diskflags & GFS2_DIF_NOATIME) |
Steven Whitehouse | 6b124d8 | 2006-11-08 12:51:06 -0500 | [diff] [blame] | 183 | flags |= S_NOATIME; |
Steven Whitehouse | 383f01f | 2008-11-04 10:05:22 +0000 | [diff] [blame] | 184 | if (ip->i_diskflags & GFS2_DIF_SYNC) |
Steven Whitehouse | 6b124d8 | 2006-11-08 12:51:06 -0500 | [diff] [blame] | 185 | flags |= S_SYNC; |
| 186 | inode->i_flags = flags; |
| 187 | } |
| 188 | |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 189 | /* Flags that can be set by user space */ |
| 190 | #define GFS2_FLAGS_USER_SET (GFS2_DIF_JDATA| \ |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 191 | GFS2_DIF_IMMUTABLE| \ |
| 192 | GFS2_DIF_APPENDONLY| \ |
| 193 | GFS2_DIF_NOATIME| \ |
| 194 | GFS2_DIF_SYNC| \ |
| 195 | GFS2_DIF_SYSTEM| \ |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 196 | 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 Whitehouse | b09e593 | 2006-04-07 11:17:32 -0400 | [diff] [blame] | 205 | static int do_gfs2_set_flags(struct file *filp, u32 reqflags, u32 mask) |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 206 | { |
Josef Sipek | 8145409 | 2006-12-08 02:37:03 -0800 | [diff] [blame] | 207 | struct inode *inode = filp->f_path.dentry->d_inode; |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 208 | struct gfs2_inode *ip = GFS2_I(inode); |
| 209 | struct gfs2_sbd *sdp = GFS2_SB(inode); |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 210 | struct buffer_head *bh; |
| 211 | struct gfs2_holder gh; |
| 212 | int error; |
Steven Whitehouse | 55eccc6 | 2006-04-04 14:29:30 -0400 | [diff] [blame] | 213 | u32 new_flags, flags; |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 214 | |
Miklos Szeredi | f58ba88 | 2008-07-02 21:12:01 +0200 | [diff] [blame] | 215 | error = mnt_want_write(filp->f_path.mnt); |
Abhijith Das | 52f341c | 2006-07-21 02:03:21 -0400 | [diff] [blame] | 216 | if (error) |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 217 | return error; |
| 218 | |
Miklos Szeredi | f58ba88 | 2008-07-02 21:12:01 +0200 | [diff] [blame] | 219 | error = gfs2_glock_nq_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); |
| 220 | if (error) |
| 221 | goto out_drop_write; |
| 222 | |
Steven Whitehouse | 7df0e03 | 2010-05-24 14:36:48 +0100 | [diff] [blame] | 223 | error = -EACCES; |
Serge E. Hallyn | 2e14967 | 2011-03-23 16:43:26 -0700 | [diff] [blame] | 224 | if (!inode_owner_or_capable(inode)) |
Steven Whitehouse | 7df0e03 | 2010-05-24 14:36:48 +0100 | [diff] [blame] | 225 | goto out; |
| 226 | |
| 227 | error = 0; |
Steven Whitehouse | 383f01f | 2008-11-04 10:05:22 +0000 | [diff] [blame] | 228 | flags = ip->i_diskflags; |
Steven Whitehouse | 55eccc6 | 2006-04-04 14:29:30 -0400 | [diff] [blame] | 229 | new_flags = (flags & ~mask) | (reqflags & mask); |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 230 | 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 Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 237 | 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 Whitehouse | 907b9bc | 2006-09-25 09:26:04 -0400 | [diff] [blame] | 242 | if (((new_flags ^ flags) & GFS2_DIF_IMMUTABLE) && |
Steven Whitehouse | b9cb981 | 2006-05-12 17:07:56 -0400 | [diff] [blame] | 243 | !capable(CAP_LINUX_IMMUTABLE)) |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 244 | goto out; |
Steven Whitehouse | b9cb981 | 2006-05-12 17:07:56 -0400 | [diff] [blame] | 245 | if (!IS_IMMUTABLE(inode)) { |
Nick Piggin | b74c79e | 2011-01-07 17:49:58 +1100 | [diff] [blame] | 246 | error = gfs2_permission(inode, MAY_WRITE, 0); |
Steven Whitehouse | b9cb981 | 2006-05-12 17:07:56 -0400 | [diff] [blame] | 247 | if (error) |
| 248 | goto out; |
| 249 | } |
Steven Whitehouse | 5561093 | 2007-10-17 08:47:38 +0100 | [diff] [blame] | 250 | 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 Whitehouse | 55eccc6 | 2006-04-04 14:29:30 -0400 | [diff] [blame] | 260 | error = gfs2_trans_begin(sdp, RES_DINODE, 0); |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 261 | if (error) |
| 262 | goto out; |
Steven Whitehouse | 55eccc6 | 2006-04-04 14:29:30 -0400 | [diff] [blame] | 263 | error = gfs2_meta_inode_buffer(ip, &bh); |
| 264 | if (error) |
| 265 | goto out_trans_end; |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 266 | gfs2_trans_add_bh(ip->i_gl, bh, 1); |
Steven Whitehouse | 383f01f | 2008-11-04 10:05:22 +0000 | [diff] [blame] | 267 | ip->i_diskflags = new_flags; |
Steven Whitehouse | 539e5d6 | 2006-10-31 15:07:05 -0500 | [diff] [blame] | 268 | gfs2_dinode_out(ip, bh->b_data); |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 269 | brelse(bh); |
Steven Whitehouse | 6b124d8 | 2006-11-08 12:51:06 -0500 | [diff] [blame] | 270 | gfs2_set_inode_flags(inode); |
Steven Whitehouse | 5561093 | 2007-10-17 08:47:38 +0100 | [diff] [blame] | 271 | gfs2_set_aops(inode); |
Steven Whitehouse | 55eccc6 | 2006-04-04 14:29:30 -0400 | [diff] [blame] | 272 | out_trans_end: |
| 273 | gfs2_trans_end(sdp); |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 274 | out: |
| 275 | gfs2_glock_dq_uninit(&gh); |
Miklos Szeredi | f58ba88 | 2008-07-02 21:12:01 +0200 | [diff] [blame] | 276 | out_drop_write: |
| 277 | mnt_drop_write(filp->f_path.mnt); |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 278 | return error; |
| 279 | } |
| 280 | |
Steven Whitehouse | b09e593 | 2006-04-07 11:17:32 -0400 | [diff] [blame] | 281 | static int gfs2_set_flags(struct file *filp, u32 __user *ptr) |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 282 | { |
Steven Whitehouse | b9af7ca | 2007-07-18 11:40:06 +0100 | [diff] [blame] | 283 | struct inode *inode = filp->f_path.dentry->d_inode; |
Steven Whitehouse | 128e5eb | 2006-10-02 11:24:43 -0400 | [diff] [blame] | 284 | u32 fsflags, gfsflags; |
Steven Whitehouse | 7df0e03 | 2010-05-24 14:36:48 +0100 | [diff] [blame] | 285 | |
Steven Whitehouse | 128e5eb | 2006-10-02 11:24:43 -0400 | [diff] [blame] | 286 | if (get_user(fsflags, ptr)) |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 287 | return -EFAULT; |
Steven Whitehouse | 7df0e03 | 2010-05-24 14:36:48 +0100 | [diff] [blame] | 288 | |
Steven Whitehouse | 128e5eb | 2006-10-02 11:24:43 -0400 | [diff] [blame] | 289 | gfsflags = fsflags_cvt(fsflags_to_gfs2, fsflags); |
Steven Whitehouse | b9af7ca | 2007-07-18 11:40:06 +0100 | [diff] [blame] | 290 | if (!S_ISDIR(inode->i_mode)) { |
| 291 | if (gfsflags & GFS2_DIF_INHERIT_JDATA) |
| 292 | gfsflags ^= (GFS2_DIF_JDATA | GFS2_DIF_INHERIT_JDATA); |
Steven Whitehouse | b9af7ca | 2007-07-18 11:40:06 +0100 | [diff] [blame] | 293 | return do_gfs2_set_flags(filp, gfsflags, ~0); |
| 294 | } |
| 295 | return do_gfs2_set_flags(filp, gfsflags, ~GFS2_DIF_JDATA); |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 296 | } |
| 297 | |
Steven Whitehouse | b09e593 | 2006-04-07 11:17:32 -0400 | [diff] [blame] | 298 | static long gfs2_ioctl(struct file *filp, unsigned int cmd, unsigned long arg) |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 299 | { |
| 300 | switch(cmd) { |
Steven Whitehouse | 128e5eb | 2006-10-02 11:24:43 -0400 | [diff] [blame] | 301 | case FS_IOC_GETFLAGS: |
Steven Whitehouse | b09e593 | 2006-04-07 11:17:32 -0400 | [diff] [blame] | 302 | return gfs2_get_flags(filp, (u32 __user *)arg); |
Steven Whitehouse | 128e5eb | 2006-10-02 11:24:43 -0400 | [diff] [blame] | 303 | case FS_IOC_SETFLAGS: |
Steven Whitehouse | b09e593 | 2006-04-07 11:17:32 -0400 | [diff] [blame] | 304 | return gfs2_set_flags(filp, (u32 __user *)arg); |
Steven Whitehouse | 71b86f5 | 2006-03-28 14:14:04 -0500 | [diff] [blame] | 305 | } |
| 306 | return -ENOTTY; |
| 307 | } |
| 308 | |
Steven Whitehouse | 3cc3f71 | 2007-10-15 15:40:33 +0100 | [diff] [blame] | 309 | /** |
| 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 | |
| 319 | static 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 Peterson | e9e1ef2 | 2007-12-10 14:13:27 -0600 | [diff] [blame] | 329 | gfs2_block_map(inode, lblock, &bh, 1); |
Steven Whitehouse | 3cc3f71 | 2007-10-15 15:40:33 +0100 | [diff] [blame] | 330 | 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 Piggin | c2ec175 | 2009-03-31 15:23:21 -0700 | [diff] [blame] | 347 | static int gfs2_page_mkwrite(struct vm_area_struct *vma, struct vm_fault *vmf) |
Steven Whitehouse | 3cc3f71 | 2007-10-15 15:40:33 +0100 | [diff] [blame] | 348 | { |
Nick Piggin | c2ec175 | 2009-03-31 15:23:21 -0700 | [diff] [blame] | 349 | struct page *page = vmf->page; |
Steven Whitehouse | 3cc3f71 | 2007-10-15 15:40:33 +0100 | [diff] [blame] | 350 | 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 Marzinski | c8f554b | 2009-01-06 10:47:50 -0600 | [diff] [blame] | 354 | u64 pos = page->index << PAGE_CACHE_SHIFT; |
Steven Whitehouse | 3cc3f71 | 2007-10-15 15:40:33 +0100 | [diff] [blame] | 355 | unsigned int data_blocks, ind_blocks, rblocks; |
Steven Whitehouse | 3cc3f71 | 2007-10-15 15:40:33 +0100 | [diff] [blame] | 356 | struct gfs2_holder gh; |
| 357 | struct gfs2_alloc *al; |
| 358 | int ret; |
| 359 | |
Steven Whitehouse | 719ee34 | 2008-09-18 13:53:59 +0100 | [diff] [blame] | 360 | gfs2_holder_init(ip->i_gl, LM_ST_EXCLUSIVE, 0, &gh); |
| 361 | ret = gfs2_glock_nq(&gh); |
Steven Whitehouse | 3cc3f71 | 2007-10-15 15:40:33 +0100 | [diff] [blame] | 362 | if (ret) |
| 363 | goto out; |
| 364 | |
Steven Whitehouse | 9c53883 | 2009-03-19 13:15:44 +0000 | [diff] [blame] | 365 | set_bit(GLF_DIRTY, &ip->i_gl->gl_flags); |
| 366 | set_bit(GIF_SW_PAGED, &ip->i_flags); |
| 367 | |
Bob Peterson | 461cb41 | 2010-06-24 19:21:20 -0400 | [diff] [blame] | 368 | if (!gfs2_write_alloc_required(ip, pos, PAGE_CACHE_SIZE)) |
Steven Whitehouse | 3cc3f71 | 2007-10-15 15:40:33 +0100 | [diff] [blame] | 369 | goto out_unlock; |
Steven Whitehouse | 6dbd822 | 2008-01-10 15:18:55 +0000 | [diff] [blame] | 370 | ret = -ENOMEM; |
Steven Whitehouse | 3cc3f71 | 2007-10-15 15:40:33 +0100 | [diff] [blame] | 371 | al = gfs2_alloc_get(ip); |
Steven Whitehouse | 6dbd822 | 2008-01-10 15:18:55 +0000 | [diff] [blame] | 372 | if (al == NULL) |
| 373 | goto out_unlock; |
| 374 | |
Steven Whitehouse | d82661d | 2008-03-10 15:34:50 +0000 | [diff] [blame] | 375 | ret = gfs2_quota_lock_check(ip); |
Steven Whitehouse | 3cc3f71 | 2007-10-15 15:40:33 +0100 | [diff] [blame] | 376 | if (ret) |
| 377 | goto out_alloc_put; |
Steven Whitehouse | 7ed122e | 2008-12-10 10:28:10 +0000 | [diff] [blame] | 378 | gfs2_write_calc_reserv(ip, PAGE_CACHE_SIZE, &data_blocks, &ind_blocks); |
Steven Whitehouse | 3cc3f71 | 2007-10-15 15:40:33 +0100 | [diff] [blame] | 379 | 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 Marzinski | bf97b67 | 2010-09-27 16:00:04 -0500 | [diff] [blame] | 387 | if (ind_blocks || data_blocks) { |
Steven Whitehouse | 3cc3f71 | 2007-10-15 15:40:33 +0100 | [diff] [blame] | 388 | rblocks += RES_STATFS + RES_QUOTA; |
Benjamin Marzinski | bf97b67 | 2010-09-27 16:00:04 -0500 | [diff] [blame] | 389 | rblocks += gfs2_rg_blocks(al); |
| 390 | } |
Steven Whitehouse | 3cc3f71 | 2007-10-15 15:40:33 +0100 | [diff] [blame] | 391 | 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 Whitehouse | b7fe2e3 | 2008-01-17 15:12:03 +0000 | [diff] [blame] | 400 | ret = 0; |
Steven Whitehouse | 3cc3f71 | 2007-10-15 15:40:33 +0100 | [diff] [blame] | 401 | 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 | |
| 410 | out_unlock_page: |
| 411 | unlock_page(page); |
| 412 | gfs2_trans_end(sdp); |
| 413 | out_trans_fail: |
| 414 | gfs2_inplace_release(ip); |
| 415 | out_quota_unlock: |
| 416 | gfs2_quota_unlock(ip); |
| 417 | out_alloc_put: |
| 418 | gfs2_alloc_put(ip); |
| 419 | out_unlock: |
| 420 | gfs2_glock_dq(&gh); |
| 421 | out: |
| 422 | gfs2_holder_uninit(&gh); |
Steven Whitehouse | e56985d | 2009-04-20 09:45:54 +0100 | [diff] [blame] | 423 | if (ret == -ENOMEM) |
| 424 | ret = VM_FAULT_OOM; |
| 425 | else if (ret) |
Nick Piggin | c2ec175 | 2009-03-31 15:23:21 -0700 | [diff] [blame] | 426 | ret = VM_FAULT_SIGBUS; |
Steven Whitehouse | 3cc3f71 | 2007-10-15 15:40:33 +0100 | [diff] [blame] | 427 | return ret; |
| 428 | } |
| 429 | |
Alexey Dobriyan | f0f37e2 | 2009-09-27 22:29:37 +0400 | [diff] [blame] | 430 | static const struct vm_operations_struct gfs2_vm_ops = { |
Steven Whitehouse | 3cc3f71 | 2007-10-15 15:40:33 +0100 | [diff] [blame] | 431 | .fault = filemap_fault, |
| 432 | .page_mkwrite = gfs2_page_mkwrite, |
| 433 | }; |
| 434 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 435 | /** |
| 436 | * gfs2_mmap - |
| 437 | * @file: The file to map |
| 438 | * @vma: The VMA which described the mapping |
| 439 | * |
Steven Whitehouse | 48bf2b1 | 2009-04-29 13:59:35 +0100 | [diff] [blame] | 440 | * 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 Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 445 | */ |
| 446 | |
| 447 | static int gfs2_mmap(struct file *file, struct vm_area_struct *vma) |
| 448 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 449 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 450 | |
Steven Whitehouse | b9c93bb | 2011-02-02 14:48:10 +0000 | [diff] [blame] | 451 | if (!(file->f_flags & O_NOATIME) && |
| 452 | !IS_NOATIME(&ip->i_inode)) { |
Steven Whitehouse | 48bf2b1 | 2009-04-29 13:59:35 +0100 | [diff] [blame] | 453 | struct gfs2_holder i_gh; |
| 454 | int error; |
| 455 | |
Steven Whitehouse | b9c93bb | 2011-02-02 14:48:10 +0000 | [diff] [blame] | 456 | gfs2_holder_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh); |
Steven Whitehouse | 48bf2b1 | 2009-04-29 13:59:35 +0100 | [diff] [blame] | 457 | error = gfs2_glock_nq(&i_gh); |
Steven Whitehouse | b9c93bb | 2011-02-02 14:48:10 +0000 | [diff] [blame] | 458 | 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 Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 465 | } |
Steven Whitehouse | 3cc3f71 | 2007-10-15 15:40:33 +0100 | [diff] [blame] | 466 | vma->vm_ops = &gfs2_vm_ops; |
Steven Whitehouse | 48bf2b1 | 2009-04-29 13:59:35 +0100 | [diff] [blame] | 467 | vma->vm_flags |= VM_CAN_NONLINEAR; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 468 | |
Steven Whitehouse | 48bf2b1 | 2009-04-29 13:59:35 +0100 | [diff] [blame] | 469 | return 0; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 470 | } |
| 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 | |
| 480 | static int gfs2_open(struct inode *inode, struct file *file) |
| 481 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 482 | struct gfs2_inode *ip = GFS2_I(inode); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 483 | struct gfs2_holder i_gh; |
| 484 | struct gfs2_file *fp; |
| 485 | int error; |
| 486 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 487 | fp = kzalloc(sizeof(struct gfs2_file), GFP_KERNEL); |
| 488 | if (!fp) |
| 489 | return -ENOMEM; |
| 490 | |
Steven Whitehouse | f55ab26 | 2006-02-21 12:51:39 +0000 | [diff] [blame] | 491 | mutex_init(&fp->f_fl_mutex); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 492 | |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 493 | gfs2_assert_warn(GFS2_SB(inode), !file->private_data); |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 494 | file->private_data = fp; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 495 | |
Steven Whitehouse | b60623c | 2006-11-01 12:22:46 -0500 | [diff] [blame] | 496 | if (S_ISREG(ip->i_inode.i_mode)) { |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 497 | 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 Whitehouse | a2e0f79 | 2010-08-11 09:53:11 +0100 | [diff] [blame] | 503 | i_size_read(inode) > MAX_NON_LFS) { |
Alan Cox | a9c62a1 | 2007-10-16 23:30:22 -0700 | [diff] [blame] | 504 | error = -EOVERFLOW; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 505 | goto fail_gunlock; |
| 506 | } |
| 507 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 508 | gfs2_glock_dq_uninit(&i_gh); |
| 509 | } |
| 510 | |
| 511 | return 0; |
| 512 | |
Steven Whitehouse | 420b9e5 | 2006-07-31 15:42:17 -0400 | [diff] [blame] | 513 | fail_gunlock: |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 514 | gfs2_glock_dq_uninit(&i_gh); |
Steven Whitehouse | 420b9e5 | 2006-07-31 15:42:17 -0400 | [diff] [blame] | 515 | fail: |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 516 | file->private_data = NULL; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 517 | kfree(fp); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 518 | 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 | |
| 529 | static int gfs2_close(struct inode *inode, struct file *file) |
| 530 | { |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 531 | struct gfs2_sbd *sdp = inode->i_sb->s_fs_info; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 532 | struct gfs2_file *fp; |
| 533 | |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 534 | fp = file->private_data; |
| 535 | file->private_data = NULL; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 536 | |
| 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 Whitehouse | dba898b | 2011-04-14 09:54:02 +0100 | [diff] [blame^] | 548 | * @datasync: set if we can ignore timestamp changes |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 549 | * |
Steven Whitehouse | dba898b | 2011-04-14 09:54:02 +0100 | [diff] [blame^] | 550 | * The VFS will flush data for us. We only need to worry |
| 551 | * about metadata here. |
Steven Whitehouse | 34126f9 | 2006-12-07 09:13:14 -0500 | [diff] [blame] | 552 | * |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 553 | * Returns: errno |
| 554 | */ |
| 555 | |
Christoph Hellwig | 7ea8085 | 2010-05-26 17:53:25 +0200 | [diff] [blame] | 556 | static int gfs2_fsync(struct file *file, int datasync) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 557 | { |
Christoph Hellwig | 7ea8085 | 2010-05-26 17:53:25 +0200 | [diff] [blame] | 558 | struct inode *inode = file->f_mapping->host; |
Steven Whitehouse | 33c3de3 | 2006-11-30 10:14:32 -0500 | [diff] [blame] | 559 | int sync_state = inode->i_state & (I_DIRTY_SYNC|I_DIRTY_DATASYNC); |
Steven Whitehouse | dba898b | 2011-04-14 09:54:02 +0100 | [diff] [blame^] | 560 | struct gfs2_inode *ip = GFS2_I(inode); |
| 561 | int ret; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 562 | |
Steven Whitehouse | dba898b | 2011-04-14 09:54:02 +0100 | [diff] [blame^] | 563 | 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 Whitehouse | 33c3de3 | 2006-11-30 10:14:32 -0500 | [diff] [blame] | 571 | } |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 572 | |
Steven Whitehouse | dba898b | 2011-04-14 09:54:02 +0100 | [diff] [blame^] | 573 | return 0; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 574 | } |
| 575 | |
Steven Whitehouse | 56aa616 | 2009-12-08 10:25:33 +0000 | [diff] [blame] | 576 | /** |
| 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 | |
| 590 | static 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 Marzinski | 0ee5320 | 2011-03-17 21:54:46 -0500 | [diff] [blame] | 610 | static int empty_write_end(struct page *page, unsigned from, |
| 611 | unsigned to, int mode) |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 612 | { |
Benjamin Marzinski | 0ee5320 | 2011-03-17 21:54:46 -0500 | [diff] [blame] | 613 | 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 Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 618 | |
Benjamin Marzinski | e4a7b7b | 2011-03-11 00:49:09 -0600 | [diff] [blame] | 619 | zero_user(page, from, to-from); |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 620 | mark_page_accessed(page); |
| 621 | |
Benjamin Marzinski | 0ee5320 | 2011-03-17 21:54:46 -0500 | [diff] [blame] | 622 | 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 Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 625 | |
Benjamin Marzinski | 0ee5320 | 2011-03-17 21:54:46 -0500 | [diff] [blame] | 626 | 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 Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 655 | } |
| 656 | |
Benjamin Marzinski | e4a7b7b | 2011-03-11 00:49:09 -0600 | [diff] [blame] | 657 | static 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 Marzinski | 0ee5320 | 2011-03-17 21:54:46 -0500 | [diff] [blame] | 669 | static int write_empty_blocks(struct page *page, unsigned from, unsigned to, |
| 670 | int mode) |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 671 | { |
Benjamin Marzinski | e4a7b7b | 2011-03-11 00:49:09 -0600 | [diff] [blame] | 672 | 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 Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 676 | |
Benjamin Marzinski | e4a7b7b | 2011-03-11 00:49:09 -0600 | [diff] [blame] | 677 | blksize = 1 << inode->i_blkbits; |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 678 | next = end = 0; |
| 679 | while (next < from) { |
Benjamin Marzinski | e4a7b7b | 2011-03-11 00:49:09 -0600 | [diff] [blame] | 680 | next += blksize; |
| 681 | block++; |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 682 | } |
| 683 | start = next; |
| 684 | do { |
Benjamin Marzinski | e4a7b7b | 2011-03-11 00:49:09 -0600 | [diff] [blame] | 685 | next += blksize; |
| 686 | ret = needs_empty_write(block, inode); |
| 687 | if (unlikely(ret < 0)) |
| 688 | return ret; |
| 689 | if (ret == 0) { |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 690 | if (end) { |
Benjamin Marzinski | e4a7b7b | 2011-03-11 00:49:09 -0600 | [diff] [blame] | 691 | ret = __block_write_begin(page, start, end - start, |
| 692 | gfs2_block_map); |
| 693 | if (unlikely(ret)) |
| 694 | return ret; |
Benjamin Marzinski | 0ee5320 | 2011-03-17 21:54:46 -0500 | [diff] [blame] | 695 | ret = empty_write_end(page, start, end, mode); |
| 696 | if (unlikely(ret)) |
| 697 | return ret; |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 698 | end = 0; |
| 699 | } |
| 700 | start = next; |
| 701 | } |
| 702 | else |
| 703 | end = next; |
Benjamin Marzinski | e4a7b7b | 2011-03-11 00:49:09 -0600 | [diff] [blame] | 704 | block++; |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 705 | } while (next < to); |
| 706 | |
| 707 | if (end) { |
Benjamin Marzinski | e4a7b7b | 2011-03-11 00:49:09 -0600 | [diff] [blame] | 708 | ret = __block_write_begin(page, start, end - start, gfs2_block_map); |
| 709 | if (unlikely(ret)) |
| 710 | return ret; |
Benjamin Marzinski | 0ee5320 | 2011-03-17 21:54:46 -0500 | [diff] [blame] | 711 | ret = empty_write_end(page, start, end, mode); |
| 712 | if (unlikely(ret)) |
| 713 | return ret; |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 714 | } |
| 715 | |
| 716 | return 0; |
| 717 | } |
| 718 | |
| 719 | static 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 Marzinski | 0ee5320 | 2011-03-17 21:54:46 -0500 | [diff] [blame] | 762 | error = write_empty_blocks(page, from, to, mode); |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 763 | 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 | |
| 781 | out: |
| 782 | return error; |
| 783 | } |
| 784 | |
| 785 | static 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 | |
| 809 | static 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 | |
| 855 | retry: |
| 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 | |
| 895 | out_trans_fail: |
| 896 | gfs2_inplace_release(ip); |
| 897 | out_qunlock: |
| 898 | gfs2_quota_unlock(ip); |
| 899 | out_alloc_put: |
| 900 | gfs2_alloc_put(ip); |
| 901 | out_unlock: |
| 902 | gfs2_glock_dq(&ip->i_gh); |
| 903 | out_uninit: |
| 904 | gfs2_holder_uninit(&ip->i_gh); |
| 905 | return error; |
| 906 | } |
| 907 | |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 908 | #ifdef CONFIG_GFS2_FS_LOCKING_DLM |
| 909 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 910 | /** |
Marc Eshel | 6044606 | 2007-01-15 18:33:36 -0500 | [diff] [blame] | 911 | * gfs2_setlease - acquire/release a file lease |
| 912 | * @file: the file pointer |
| 913 | * @arg: lease type |
| 914 | * @fl: file lock |
| 915 | * |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 916 | * 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 Bergmann | b89f432 | 2010-09-18 15:09:31 +0200 | [diff] [blame] | 920 | * Locking: called under lock_flocks |
| 921 | * |
Marc Eshel | 6044606 | 2007-01-15 18:33:36 -0500 | [diff] [blame] | 922 | * Returns: errno |
| 923 | */ |
| 924 | |
| 925 | static int gfs2_setlease(struct file *file, long arg, struct file_lock **fl) |
| 926 | { |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 927 | return -EINVAL; |
Steven Whitehouse | da755fd | 2008-01-30 15:34:04 +0000 | [diff] [blame] | 928 | } |
| 929 | |
Marc Eshel | 6044606 | 2007-01-15 18:33:36 -0500 | [diff] [blame] | 930 | /** |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 931 | * 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 | |
| 939 | static int gfs2_lock(struct file *file, int cmd, struct file_lock *fl) |
| 940 | { |
Steven Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 941 | struct gfs2_inode *ip = GFS2_I(file->f_mapping->host); |
| 942 | struct gfs2_sbd *sdp = GFS2_SB(file->f_mapping->host); |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 943 | struct lm_lockstruct *ls = &sdp->sd_lockstruct; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 944 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 945 | if (!(fl->fl_flags & FL_POSIX)) |
| 946 | return -ENOLCK; |
Sachin Prabhu | 720e774 | 2010-03-11 12:24:45 -0500 | [diff] [blame] | 947 | if (__mandatory_lock(&ip->i_inode) && fl->fl_type != F_UNLCK) |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 948 | return -ENOLCK; |
| 949 | |
Marc Eshel | 586759f | 2006-11-14 16:37:25 -0500 | [diff] [blame] | 950 | if (cmd == F_CANCELLK) { |
| 951 | /* Hack: */ |
| 952 | cmd = F_SETLK; |
| 953 | fl->fl_type = F_UNLCK; |
| 954 | } |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 955 | if (unlikely(test_bit(SDF_SHUTDOWN, &sdp->sd_flags))) |
| 956 | return -EIO; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 957 | if (IS_GETLK(cmd)) |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 958 | return dlm_posix_get(ls->ls_dlm, ip->i_no_addr, file, fl); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 959 | else if (fl->fl_type == F_UNLCK) |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 960 | return dlm_posix_unlock(ls->ls_dlm, ip->i_no_addr, file, fl); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 961 | else |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 962 | return dlm_posix_lock(ls->ls_dlm, ip->i_no_addr, file, cmd, fl); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 963 | } |
| 964 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 965 | static int do_flock(struct file *file, int cmd, struct file_lock *fl) |
| 966 | { |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 967 | struct gfs2_file *fp = file->private_data; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 968 | struct gfs2_holder *fl_gh = &fp->f_fl_gh; |
Josef Sipek | 8145409 | 2006-12-08 02:37:03 -0800 | [diff] [blame] | 969 | struct gfs2_inode *ip = GFS2_I(file->f_path.dentry->d_inode); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 970 | 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 Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 976 | flags = (IS_SETLKW(cmd) ? 0 : LM_FLAG_TRY) | GL_EXACT | GL_NOCACHE; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 977 | |
Steven Whitehouse | f55ab26 | 2006-02-21 12:51:39 +0000 | [diff] [blame] | 978 | mutex_lock(&fp->f_fl_mutex); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 979 | |
| 980 | gl = fl_gh->gh_gl; |
| 981 | if (gl) { |
| 982 | if (fl_gh->gh_state == state) |
| 983 | goto out; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 984 | flock_lock_file_wait(file, |
Steven Whitehouse | 907b9bc | 2006-09-25 09:26:04 -0400 | [diff] [blame] | 985 | &(struct file_lock){.fl_type = F_UNLCK}); |
Abhijith Das | b4c2016 | 2007-09-13 23:35:27 -0500 | [diff] [blame] | 986 | gfs2_glock_dq_wait(fl_gh); |
| 987 | gfs2_holder_reinit(state, flags, fl_gh); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 988 | } else { |
Steven Whitehouse | 6802e34 | 2008-05-21 17:03:22 +0100 | [diff] [blame] | 989 | error = gfs2_glock_get(GFS2_SB(&ip->i_inode), ip->i_no_addr, |
| 990 | &gfs2_flock_glops, CREATE, &gl); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 991 | if (error) |
| 992 | goto out; |
Abhijith Das | b4c2016 | 2007-09-13 23:35:27 -0500 | [diff] [blame] | 993 | gfs2_holder_init(gl, state, flags, fl_gh); |
| 994 | gfs2_glock_put(gl); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 995 | } |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 996 | 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 Whitehouse | feaa7bb | 2006-06-14 15:32:57 -0400 | [diff] [blame] | 1003 | gfs2_assert_warn(GFS2_SB(&ip->i_inode), !error); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1004 | } |
| 1005 | |
Steven Whitehouse | 420b9e5 | 2006-07-31 15:42:17 -0400 | [diff] [blame] | 1006 | out: |
Steven Whitehouse | f55ab26 | 2006-02-21 12:51:39 +0000 | [diff] [blame] | 1007 | mutex_unlock(&fp->f_fl_mutex); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1008 | return error; |
| 1009 | } |
| 1010 | |
| 1011 | static void do_unflock(struct file *file, struct file_lock *fl) |
| 1012 | { |
Steven Whitehouse | 5c676f6 | 2006-02-27 17:23:27 -0500 | [diff] [blame] | 1013 | struct gfs2_file *fp = file->private_data; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1014 | struct gfs2_holder *fl_gh = &fp->f_fl_gh; |
| 1015 | |
Steven Whitehouse | f55ab26 | 2006-02-21 12:51:39 +0000 | [diff] [blame] | 1016 | mutex_lock(&fp->f_fl_mutex); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1017 | flock_lock_file_wait(file, fl); |
Steven Whitehouse | 0a33443 | 2011-03-09 11:14:32 +0000 | [diff] [blame] | 1018 | if (fl_gh->gh_gl) { |
| 1019 | gfs2_glock_dq_wait(fl_gh); |
| 1020 | gfs2_holder_uninit(fl_gh); |
| 1021 | } |
Steven Whitehouse | f55ab26 | 2006-02-21 12:51:39 +0000 | [diff] [blame] | 1022 | mutex_unlock(&fp->f_fl_mutex); |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1023 | } |
| 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 | |
| 1034 | static int gfs2_flock(struct file *file, int cmd, struct file_lock *fl) |
| 1035 | { |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1036 | if (!(fl->fl_flags & FL_FLOCK)) |
| 1037 | return -ENOLCK; |
Abhijith Das | a12af1e | 2009-06-01 12:30:03 -0500 | [diff] [blame] | 1038 | if (fl->fl_type & LOCK_MAND) |
| 1039 | return -EOPNOTSUPP; |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1040 | |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1041 | if (fl->fl_type == F_UNLCK) { |
| 1042 | do_unflock(file, fl); |
| 1043 | return 0; |
Steven Whitehouse | d00223f | 2006-10-02 10:28:05 -0400 | [diff] [blame] | 1044 | } else { |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1045 | return do_flock(file, cmd, fl); |
Steven Whitehouse | d00223f | 2006-10-02 10:28:05 -0400 | [diff] [blame] | 1046 | } |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1047 | } |
| 1048 | |
Christoph Hellwig | 10d2198 | 2009-04-07 19:42:17 +0200 | [diff] [blame] | 1049 | const struct file_operations gfs2_file_fops = { |
Steven Whitehouse | 26c1a57 | 2006-09-04 15:32:10 -0400 | [diff] [blame] | 1050 | .llseek = gfs2_llseek, |
Steven Whitehouse | d00223f | 2006-10-02 10:28:05 -0400 | [diff] [blame] | 1051 | .read = do_sync_read, |
Steven Whitehouse | 26c1a57 | 2006-09-04 15:32:10 -0400 | [diff] [blame] | 1052 | .aio_read = generic_file_aio_read, |
Steven Whitehouse | d00223f | 2006-10-02 10:28:05 -0400 | [diff] [blame] | 1053 | .write = do_sync_write, |
Steven Whitehouse | 56aa616 | 2009-12-08 10:25:33 +0000 | [diff] [blame] | 1054 | .aio_write = gfs2_file_aio_write, |
Steven Whitehouse | 26c1a57 | 2006-09-04 15:32:10 -0400 | [diff] [blame] | 1055 | .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 Whitehouse | 26c1a57 | 2006-09-04 15:32:10 -0400 | [diff] [blame] | 1061 | .flock = gfs2_flock, |
| 1062 | .splice_read = generic_file_splice_read, |
| 1063 | .splice_write = generic_file_splice_write, |
Marc Eshel | 6044606 | 2007-01-15 18:33:36 -0500 | [diff] [blame] | 1064 | .setlease = gfs2_setlease, |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 1065 | .fallocate = gfs2_fallocate, |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1066 | }; |
| 1067 | |
Christoph Hellwig | 10d2198 | 2009-04-07 19:42:17 +0200 | [diff] [blame] | 1068 | const struct file_operations gfs2_dir_fops = { |
Steven Whitehouse | 26c1a57 | 2006-09-04 15:32:10 -0400 | [diff] [blame] | 1069 | .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 Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 1076 | .llseek = default_llseek, |
David Teigland | b3b94fa | 2006-01-16 16:50:04 +0000 | [diff] [blame] | 1077 | }; |
| 1078 | |
Steven Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 1079 | #endif /* CONFIG_GFS2_FS_LOCKING_DLM */ |
| 1080 | |
Christoph Hellwig | 10d2198 | 2009-04-07 19:42:17 +0200 | [diff] [blame] | 1081 | const struct file_operations gfs2_file_fops_nolock = { |
Wendy Cheng | c97bfe4 | 2007-11-29 17:56:51 -0500 | [diff] [blame] | 1082 | .llseek = gfs2_llseek, |
| 1083 | .read = do_sync_read, |
| 1084 | .aio_read = generic_file_aio_read, |
| 1085 | .write = do_sync_write, |
Steven Whitehouse | 56aa616 | 2009-12-08 10:25:33 +0000 | [diff] [blame] | 1086 | .aio_write = gfs2_file_aio_write, |
Wendy Cheng | c97bfe4 | 2007-11-29 17:56:51 -0500 | [diff] [blame] | 1087 | .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 Whitehouse | f057f6c | 2009-01-12 10:43:39 +0000 | [diff] [blame] | 1094 | .setlease = generic_setlease, |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 1095 | .fallocate = gfs2_fallocate, |
Wendy Cheng | c97bfe4 | 2007-11-29 17:56:51 -0500 | [diff] [blame] | 1096 | }; |
| 1097 | |
Christoph Hellwig | 10d2198 | 2009-04-07 19:42:17 +0200 | [diff] [blame] | 1098 | const struct file_operations gfs2_dir_fops_nolock = { |
Wendy Cheng | c97bfe4 | 2007-11-29 17:56:51 -0500 | [diff] [blame] | 1099 | .readdir = gfs2_readdir, |
| 1100 | .unlocked_ioctl = gfs2_ioctl, |
| 1101 | .open = gfs2_open, |
| 1102 | .release = gfs2_close, |
| 1103 | .fsync = gfs2_fsync, |
Arnd Bergmann | 6038f37 | 2010-08-15 18:52:59 +0200 | [diff] [blame] | 1104 | .llseek = default_llseek, |
Wendy Cheng | c97bfe4 | 2007-11-29 17:56:51 -0500 | [diff] [blame] | 1105 | }; |
| 1106 | |