Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 2 | * Copyright (c) 2000-2005 Silicon Graphics, Inc. |
| 3 | * All Rights Reserved. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 4 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 5 | * This program is free software; you can redistribute it and/or |
| 6 | * modify it under the terms of the GNU General Public License as |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 7 | * published by the Free Software Foundation. |
| 8 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 9 | * This program is distributed in the hope that it would be useful, |
| 10 | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
| 11 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
| 12 | * GNU General Public License for more details. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 13 | * |
Nathan Scott | 7b71876 | 2005-11-02 14:58:39 +1100 | [diff] [blame] | 14 | * You should have received a copy of the GNU General Public License |
| 15 | * along with this program; if not, write the Free Software Foundation, |
| 16 | * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | */ |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 18 | #include "xfs.h" |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 19 | #include "xfs_fs.h" |
Dave Chinner | 70a9883 | 2013-10-23 10:36:05 +1100 | [diff] [blame] | 20 | #include "xfs_shared.h" |
Dave Chinner | a4fbe6a | 2013-10-23 10:51:50 +1100 | [diff] [blame] | 21 | #include "xfs_format.h" |
Dave Chinner | 239880e | 2013-10-23 10:50:10 +1100 | [diff] [blame] | 22 | #include "xfs_log_format.h" |
| 23 | #include "xfs_trans_resv.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 24 | #include "xfs_mount.h" |
Dave Chinner | 5706278 | 2013-10-15 09:17:51 +1100 | [diff] [blame] | 25 | #include "xfs_da_format.h" |
| 26 | #include "xfs_da_btree.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 27 | #include "xfs_inode.h" |
Dave Chinner | 239880e | 2013-10-23 10:50:10 +1100 | [diff] [blame] | 28 | #include "xfs_trans.h" |
Christoph Hellwig | fd3200b | 2010-02-15 09:44:48 +0000 | [diff] [blame] | 29 | #include "xfs_inode_item.h" |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 30 | #include "xfs_bmap.h" |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 31 | #include "xfs_bmap_util.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 32 | #include "xfs_error.h" |
Dave Chinner | 2b9ab5a | 2013-08-12 20:49:37 +1000 | [diff] [blame] | 33 | #include "xfs_dir2.h" |
Dave Chinner | c24b5df | 2013-08-12 20:49:45 +1000 | [diff] [blame] | 34 | #include "xfs_dir2_priv.h" |
Christoph Hellwig | ddcd856 | 2008-12-03 07:55:34 -0500 | [diff] [blame] | 35 | #include "xfs_ioctl.h" |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 36 | #include "xfs_trace.h" |
Dave Chinner | 239880e | 2013-10-23 10:50:10 +1100 | [diff] [blame] | 37 | #include "xfs_log.h" |
Brian Foster | dc06f398 | 2014-07-24 19:49:28 +1000 | [diff] [blame] | 38 | #include "xfs_icache.h" |
Christoph Hellwig | 781355c | 2015-02-16 11:59:50 +1100 | [diff] [blame] | 39 | #include "xfs_pnfs.h" |
Christoph Hellwig | 68a9f5e | 2016-06-21 09:53:44 +1000 | [diff] [blame] | 40 | #include "xfs_iomap.h" |
Darrick J. Wong | 0613f16 | 2016-10-03 09:11:37 -0700 | [diff] [blame] | 41 | #include "xfs_reflink.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | |
| 43 | #include <linux/dcache.h> |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 44 | #include <linux/falloc.h> |
Jeff Liu | d126d43 | 2012-08-21 17:11:57 +0800 | [diff] [blame] | 45 | #include <linux/pagevec.h> |
Tejun Heo | 66114ca | 2015-05-22 17:13:32 -0400 | [diff] [blame] | 46 | #include <linux/backing-dev.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 47 | |
Alexey Dobriyan | f0f37e2f | 2009-09-27 22:29:37 +0400 | [diff] [blame] | 48 | static const struct vm_operations_struct xfs_file_vm_ops; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 49 | |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 50 | /* |
Christoph Hellwig | 68a9f5e | 2016-06-21 09:53:44 +1000 | [diff] [blame] | 51 | * Clear the specified ranges to zero through either the pagecache or DAX. |
| 52 | * Holes and unwritten extents will be left as-is as they already are zeroed. |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 53 | */ |
Dave Chinner | ef9d873 | 2012-11-29 15:26:33 +1100 | [diff] [blame] | 54 | int |
Christoph Hellwig | 7bb41db | 2016-06-21 09:56:26 +1000 | [diff] [blame] | 55 | xfs_zero_range( |
Christoph Hellwig | 68a9f5e | 2016-06-21 09:53:44 +1000 | [diff] [blame] | 56 | struct xfs_inode *ip, |
Christoph Hellwig | 7bb41db | 2016-06-21 09:56:26 +1000 | [diff] [blame] | 57 | xfs_off_t pos, |
| 58 | xfs_off_t count, |
| 59 | bool *did_zero) |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 60 | { |
Christoph Hellwig | 459f0fb | 2016-06-21 09:55:18 +1000 | [diff] [blame] | 61 | return iomap_zero_range(VFS_I(ip), pos, count, NULL, &xfs_iomap_ops); |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 62 | } |
| 63 | |
Christoph Hellwig | 8add71c | 2015-02-02 09:53:56 +1100 | [diff] [blame] | 64 | int |
| 65 | xfs_update_prealloc_flags( |
| 66 | struct xfs_inode *ip, |
| 67 | enum xfs_prealloc_flags flags) |
| 68 | { |
| 69 | struct xfs_trans *tp; |
| 70 | int error; |
| 71 | |
Christoph Hellwig | 253f491 | 2016-04-06 09:19:55 +1000 | [diff] [blame] | 72 | error = xfs_trans_alloc(ip->i_mount, &M_RES(ip->i_mount)->tr_writeid, |
| 73 | 0, 0, 0, &tp); |
| 74 | if (error) |
Christoph Hellwig | 8add71c | 2015-02-02 09:53:56 +1100 | [diff] [blame] | 75 | return error; |
Christoph Hellwig | 8add71c | 2015-02-02 09:53:56 +1100 | [diff] [blame] | 76 | |
| 77 | xfs_ilock(ip, XFS_ILOCK_EXCL); |
| 78 | xfs_trans_ijoin(tp, ip, XFS_ILOCK_EXCL); |
| 79 | |
| 80 | if (!(flags & XFS_PREALLOC_INVISIBLE)) { |
Dave Chinner | c19b3b05 | 2016-02-09 16:54:58 +1100 | [diff] [blame] | 81 | VFS_I(ip)->i_mode &= ~S_ISUID; |
| 82 | if (VFS_I(ip)->i_mode & S_IXGRP) |
| 83 | VFS_I(ip)->i_mode &= ~S_ISGID; |
Christoph Hellwig | 8add71c | 2015-02-02 09:53:56 +1100 | [diff] [blame] | 84 | xfs_trans_ichgtime(tp, ip, XFS_ICHGTIME_MOD | XFS_ICHGTIME_CHG); |
| 85 | } |
| 86 | |
| 87 | if (flags & XFS_PREALLOC_SET) |
| 88 | ip->i_d.di_flags |= XFS_DIFLAG_PREALLOC; |
| 89 | if (flags & XFS_PREALLOC_CLEAR) |
| 90 | ip->i_d.di_flags &= ~XFS_DIFLAG_PREALLOC; |
| 91 | |
| 92 | xfs_trans_log_inode(tp, ip, XFS_ILOG_CORE); |
| 93 | if (flags & XFS_PREALLOC_SYNC) |
| 94 | xfs_trans_set_sync(tp); |
Christoph Hellwig | 7039331 | 2015-06-04 13:48:08 +1000 | [diff] [blame] | 95 | return xfs_trans_commit(tp); |
Christoph Hellwig | 8add71c | 2015-02-02 09:53:56 +1100 | [diff] [blame] | 96 | } |
| 97 | |
Christoph Hellwig | 1da2f2d | 2011-10-02 14:25:16 +0000 | [diff] [blame] | 98 | /* |
| 99 | * Fsync operations on directories are much simpler than on regular files, |
| 100 | * as there is no file data to flush, and thus also no need for explicit |
| 101 | * cache flush operations, and there are no non-transaction metadata updates |
| 102 | * on directories either. |
| 103 | */ |
| 104 | STATIC int |
| 105 | xfs_dir_fsync( |
| 106 | struct file *file, |
| 107 | loff_t start, |
| 108 | loff_t end, |
| 109 | int datasync) |
| 110 | { |
| 111 | struct xfs_inode *ip = XFS_I(file->f_mapping->host); |
| 112 | struct xfs_mount *mp = ip->i_mount; |
| 113 | xfs_lsn_t lsn = 0; |
| 114 | |
| 115 | trace_xfs_dir_fsync(ip); |
| 116 | |
| 117 | xfs_ilock(ip, XFS_ILOCK_SHARED); |
| 118 | if (xfs_ipincount(ip)) |
| 119 | lsn = ip->i_itemp->ili_last_lsn; |
| 120 | xfs_iunlock(ip, XFS_ILOCK_SHARED); |
| 121 | |
| 122 | if (!lsn) |
| 123 | return 0; |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 124 | return _xfs_log_force_lsn(mp, lsn, XFS_LOG_SYNC, NULL); |
Christoph Hellwig | 1da2f2d | 2011-10-02 14:25:16 +0000 | [diff] [blame] | 125 | } |
| 126 | |
Christoph Hellwig | fd3200b | 2010-02-15 09:44:48 +0000 | [diff] [blame] | 127 | STATIC int |
| 128 | xfs_file_fsync( |
| 129 | struct file *file, |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 130 | loff_t start, |
| 131 | loff_t end, |
Christoph Hellwig | fd3200b | 2010-02-15 09:44:48 +0000 | [diff] [blame] | 132 | int datasync) |
| 133 | { |
Christoph Hellwig | 7ea8085 | 2010-05-26 17:53:25 +0200 | [diff] [blame] | 134 | struct inode *inode = file->f_mapping->host; |
| 135 | struct xfs_inode *ip = XFS_I(inode); |
Christoph Hellwig | a27a263 | 2011-06-16 12:02:23 +0000 | [diff] [blame] | 136 | struct xfs_mount *mp = ip->i_mount; |
Christoph Hellwig | fd3200b | 2010-02-15 09:44:48 +0000 | [diff] [blame] | 137 | int error = 0; |
| 138 | int log_flushed = 0; |
Christoph Hellwig | b103705 | 2011-09-19 14:55:51 +0000 | [diff] [blame] | 139 | xfs_lsn_t lsn = 0; |
Christoph Hellwig | fd3200b | 2010-02-15 09:44:48 +0000 | [diff] [blame] | 140 | |
Christoph Hellwig | cca28fb | 2010-06-24 11:57:09 +1000 | [diff] [blame] | 141 | trace_xfs_file_fsync(ip); |
Christoph Hellwig | fd3200b | 2010-02-15 09:44:48 +0000 | [diff] [blame] | 142 | |
Jeff Layton | 1b18027 | 2017-07-06 07:02:30 -0400 | [diff] [blame] | 143 | error = file_write_and_wait_range(file, start, end); |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 144 | if (error) |
| 145 | return error; |
| 146 | |
Christoph Hellwig | a27a263 | 2011-06-16 12:02:23 +0000 | [diff] [blame] | 147 | if (XFS_FORCED_SHUTDOWN(mp)) |
Eric Sandeen | b474c7a | 2014-06-22 15:04:54 +1000 | [diff] [blame] | 148 | return -EIO; |
Christoph Hellwig | fd3200b | 2010-02-15 09:44:48 +0000 | [diff] [blame] | 149 | |
| 150 | xfs_iflags_clear(ip, XFS_ITRUNCATED); |
| 151 | |
Dave Chinner | 2291dab | 2016-12-09 16:49:54 +1100 | [diff] [blame] | 152 | /* |
| 153 | * If we have an RT and/or log subvolume we need to make sure to flush |
| 154 | * the write cache the device used for file data first. This is to |
| 155 | * ensure newly written file data make it to disk before logging the new |
| 156 | * inode size in case of an extending write. |
| 157 | */ |
| 158 | if (XFS_IS_REALTIME_INODE(ip)) |
| 159 | xfs_blkdev_issue_flush(mp->m_rtdev_targp); |
| 160 | else if (mp->m_logdev_targp != mp->m_ddev_targp) |
| 161 | xfs_blkdev_issue_flush(mp->m_ddev_targp); |
Christoph Hellwig | a27a263 | 2011-06-16 12:02:23 +0000 | [diff] [blame] | 162 | |
Christoph Hellwig | fd3200b | 2010-02-15 09:44:48 +0000 | [diff] [blame] | 163 | /* |
Dave Chinner | fc0561c | 2015-11-03 13:14:59 +1100 | [diff] [blame] | 164 | * All metadata updates are logged, which means that we just have to |
| 165 | * flush the log up to the latest LSN that touched the inode. If we have |
| 166 | * concurrent fsync/fdatasync() calls, we need them to all block on the |
| 167 | * log force before we clear the ili_fsync_fields field. This ensures |
| 168 | * that we don't get a racing sync operation that does not wait for the |
| 169 | * metadata to hit the journal before returning. If we race with |
| 170 | * clearing the ili_fsync_fields, then all that will happen is the log |
| 171 | * force will do nothing as the lsn will already be on disk. We can't |
| 172 | * race with setting ili_fsync_fields because that is done under |
| 173 | * XFS_ILOCK_EXCL, and that can't happen because we hold the lock shared |
| 174 | * until after the ili_fsync_fields is cleared. |
Christoph Hellwig | fd3200b | 2010-02-15 09:44:48 +0000 | [diff] [blame] | 175 | */ |
| 176 | xfs_ilock(ip, XFS_ILOCK_SHARED); |
Christoph Hellwig | 8f639dd | 2012-02-29 09:53:55 +0000 | [diff] [blame] | 177 | if (xfs_ipincount(ip)) { |
| 178 | if (!datasync || |
Dave Chinner | fc0561c | 2015-11-03 13:14:59 +1100 | [diff] [blame] | 179 | (ip->i_itemp->ili_fsync_fields & ~XFS_ILOG_TIMESTAMP)) |
Christoph Hellwig | 8f639dd | 2012-02-29 09:53:55 +0000 | [diff] [blame] | 180 | lsn = ip->i_itemp->ili_last_lsn; |
| 181 | } |
Christoph Hellwig | fd3200b | 2010-02-15 09:44:48 +0000 | [diff] [blame] | 182 | |
Dave Chinner | fc0561c | 2015-11-03 13:14:59 +1100 | [diff] [blame] | 183 | if (lsn) { |
Christoph Hellwig | b103705 | 2011-09-19 14:55:51 +0000 | [diff] [blame] | 184 | error = _xfs_log_force_lsn(mp, lsn, XFS_LOG_SYNC, &log_flushed); |
Dave Chinner | fc0561c | 2015-11-03 13:14:59 +1100 | [diff] [blame] | 185 | ip->i_itemp->ili_fsync_fields = 0; |
| 186 | } |
| 187 | xfs_iunlock(ip, XFS_ILOCK_SHARED); |
Christoph Hellwig | b103705 | 2011-09-19 14:55:51 +0000 | [diff] [blame] | 188 | |
Christoph Hellwig | a27a263 | 2011-06-16 12:02:23 +0000 | [diff] [blame] | 189 | /* |
| 190 | * If we only have a single device, and the log force about was |
| 191 | * a no-op we might have to flush the data device cache here. |
| 192 | * This can only happen for fdatasync/O_DSYNC if we were overwriting |
| 193 | * an already allocated file and thus do not have any metadata to |
| 194 | * commit. |
| 195 | */ |
Dave Chinner | 2291dab | 2016-12-09 16:49:54 +1100 | [diff] [blame] | 196 | if (!log_flushed && !XFS_IS_REALTIME_INODE(ip) && |
| 197 | mp->m_logdev_targp == mp->m_ddev_targp) |
Christoph Hellwig | a27a263 | 2011-06-16 12:02:23 +0000 | [diff] [blame] | 198 | xfs_blkdev_issue_flush(mp->m_ddev_targp); |
Christoph Hellwig | fd3200b | 2010-02-15 09:44:48 +0000 | [diff] [blame] | 199 | |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 200 | return error; |
Christoph Hellwig | fd3200b | 2010-02-15 09:44:48 +0000 | [diff] [blame] | 201 | } |
| 202 | |
Christoph Hellwig | 00258e3 | 2010-02-15 09:44:47 +0000 | [diff] [blame] | 203 | STATIC ssize_t |
Christoph Hellwig | bbc5a74 | 2016-07-20 11:35:42 +1000 | [diff] [blame] | 204 | xfs_file_dio_aio_read( |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 205 | struct kiocb *iocb, |
Al Viro | b4f5d2c | 2014-04-02 14:37:59 -0400 | [diff] [blame] | 206 | struct iov_iter *to) |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 207 | { |
Christoph Hellwig | acdda3a | 2016-11-30 14:37:15 +1100 | [diff] [blame] | 208 | struct xfs_inode *ip = XFS_I(file_inode(iocb->ki_filp)); |
Christoph Hellwig | bbc5a74 | 2016-07-20 11:35:42 +1000 | [diff] [blame] | 209 | size_t count = iov_iter_count(to); |
Christoph Hellwig | acdda3a | 2016-11-30 14:37:15 +1100 | [diff] [blame] | 210 | ssize_t ret; |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 211 | |
Christoph Hellwig | bbc5a74 | 2016-07-20 11:35:42 +1000 | [diff] [blame] | 212 | trace_xfs_file_direct_read(ip, count, iocb->ki_pos); |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 213 | |
Christoph Hellwig | f1285ff | 2016-07-20 11:36:57 +1000 | [diff] [blame] | 214 | if (!count) |
| 215 | return 0; /* skip atime */ |
Christoph Hellwig | 00258e3 | 2010-02-15 09:44:47 +0000 | [diff] [blame] | 216 | |
Christoph Hellwig | a447d7c | 2016-10-03 09:47:34 +1100 | [diff] [blame] | 217 | file_accessed(iocb->ki_filp); |
| 218 | |
Christoph Hellwig | 6552321 | 2016-11-30 14:33:25 +1100 | [diff] [blame] | 219 | xfs_ilock(ip, XFS_IOLOCK_SHARED); |
Christoph Hellwig | acdda3a | 2016-11-30 14:37:15 +1100 | [diff] [blame] | 220 | ret = iomap_dio_rw(iocb, to, &xfs_iomap_ops, NULL); |
Christoph Hellwig | 6552321 | 2016-11-30 14:33:25 +1100 | [diff] [blame] | 221 | xfs_iunlock(ip, XFS_IOLOCK_SHARED); |
Christoph Hellwig | acdda3a | 2016-11-30 14:37:15 +1100 | [diff] [blame] | 222 | |
Christoph Hellwig | 16d4d43 | 2016-07-20 11:38:55 +1000 | [diff] [blame] | 223 | return ret; |
| 224 | } |
| 225 | |
Arnd Bergmann | f021bd0 | 2016-07-22 09:50:55 +1000 | [diff] [blame] | 226 | static noinline ssize_t |
Christoph Hellwig | 16d4d43 | 2016-07-20 11:38:55 +1000 | [diff] [blame] | 227 | xfs_file_dax_read( |
| 228 | struct kiocb *iocb, |
| 229 | struct iov_iter *to) |
| 230 | { |
Christoph Hellwig | 6c31f495 | 2016-09-19 11:28:38 +1000 | [diff] [blame] | 231 | struct xfs_inode *ip = XFS_I(iocb->ki_filp->f_mapping->host); |
Christoph Hellwig | 16d4d43 | 2016-07-20 11:38:55 +1000 | [diff] [blame] | 232 | size_t count = iov_iter_count(to); |
| 233 | ssize_t ret = 0; |
| 234 | |
| 235 | trace_xfs_file_dax_read(ip, count, iocb->ki_pos); |
| 236 | |
| 237 | if (!count) |
| 238 | return 0; /* skip atime */ |
| 239 | |
Goldwyn Rodrigues | 29a5d29 | 2017-06-20 07:05:48 -0500 | [diff] [blame] | 240 | if (!xfs_ilock_nowait(ip, XFS_IOLOCK_SHARED)) { |
| 241 | if (iocb->ki_flags & IOCB_NOWAIT) |
| 242 | return -EAGAIN; |
| 243 | xfs_ilock(ip, XFS_IOLOCK_SHARED); |
| 244 | } |
Ross Zwisler | 11c59c9 | 2016-11-08 11:32:46 +1100 | [diff] [blame] | 245 | ret = dax_iomap_rw(iocb, to, &xfs_iomap_ops); |
Christoph Hellwig | 6552321 | 2016-11-30 14:33:25 +1100 | [diff] [blame] | 246 | xfs_iunlock(ip, XFS_IOLOCK_SHARED); |
Christoph Hellwig | bbc5a74 | 2016-07-20 11:35:42 +1000 | [diff] [blame] | 247 | |
Christoph Hellwig | f1285ff | 2016-07-20 11:36:57 +1000 | [diff] [blame] | 248 | file_accessed(iocb->ki_filp); |
Christoph Hellwig | bbc5a74 | 2016-07-20 11:35:42 +1000 | [diff] [blame] | 249 | return ret; |
| 250 | } |
| 251 | |
| 252 | STATIC ssize_t |
| 253 | xfs_file_buffered_aio_read( |
| 254 | struct kiocb *iocb, |
| 255 | struct iov_iter *to) |
| 256 | { |
| 257 | struct xfs_inode *ip = XFS_I(file_inode(iocb->ki_filp)); |
| 258 | ssize_t ret; |
| 259 | |
| 260 | trace_xfs_file_buffered_read(ip, iov_iter_count(to), iocb->ki_pos); |
| 261 | |
Christoph Hellwig | 6552321 | 2016-11-30 14:33:25 +1100 | [diff] [blame] | 262 | xfs_ilock(ip, XFS_IOLOCK_SHARED); |
Al Viro | b4f5d2c | 2014-04-02 14:37:59 -0400 | [diff] [blame] | 263 | ret = generic_file_read_iter(iocb, to); |
Christoph Hellwig | 6552321 | 2016-11-30 14:33:25 +1100 | [diff] [blame] | 264 | xfs_iunlock(ip, XFS_IOLOCK_SHARED); |
Christoph Hellwig | bbc5a74 | 2016-07-20 11:35:42 +1000 | [diff] [blame] | 265 | |
| 266 | return ret; |
| 267 | } |
| 268 | |
| 269 | STATIC ssize_t |
| 270 | xfs_file_read_iter( |
| 271 | struct kiocb *iocb, |
| 272 | struct iov_iter *to) |
| 273 | { |
Christoph Hellwig | 16d4d43 | 2016-07-20 11:38:55 +1000 | [diff] [blame] | 274 | struct inode *inode = file_inode(iocb->ki_filp); |
| 275 | struct xfs_mount *mp = XFS_I(inode)->i_mount; |
Christoph Hellwig | bbc5a74 | 2016-07-20 11:35:42 +1000 | [diff] [blame] | 276 | ssize_t ret = 0; |
| 277 | |
| 278 | XFS_STATS_INC(mp, xs_read_calls); |
| 279 | |
| 280 | if (XFS_FORCED_SHUTDOWN(mp)) |
| 281 | return -EIO; |
| 282 | |
Christoph Hellwig | 16d4d43 | 2016-07-20 11:38:55 +1000 | [diff] [blame] | 283 | if (IS_DAX(inode)) |
| 284 | ret = xfs_file_dax_read(iocb, to); |
| 285 | else if (iocb->ki_flags & IOCB_DIRECT) |
Christoph Hellwig | bbc5a74 | 2016-07-20 11:35:42 +1000 | [diff] [blame] | 286 | ret = xfs_file_dio_aio_read(iocb, to); |
| 287 | else |
| 288 | ret = xfs_file_buffered_aio_read(iocb, to); |
| 289 | |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 290 | if (ret > 0) |
Bill O'Donnell | ff6d6af | 2015-10-12 18:21:22 +1100 | [diff] [blame] | 291 | XFS_STATS_ADD(mp, xs_read_bytes, ret); |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 292 | return ret; |
| 293 | } |
| 294 | |
Dave Chinner | 4c5cfd1 | 2011-01-11 10:14:16 +1100 | [diff] [blame] | 295 | /* |
Christoph Hellwig | 193aec1 | 2012-03-27 10:34:49 -0400 | [diff] [blame] | 296 | * Zero any on disk space between the current EOF and the new, larger EOF. |
| 297 | * |
| 298 | * This handles the normal case of zeroing the remainder of the last block in |
| 299 | * the file and the unusual case of zeroing blocks out beyond the size of the |
| 300 | * file. This second case only happens with fixed size extents and when the |
| 301 | * system crashes before the inode size was updated but after blocks were |
| 302 | * allocated. |
| 303 | * |
| 304 | * Expects the iolock to be held exclusive, and will take the ilock internally. |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 305 | */ |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 306 | int /* error (positive) */ |
| 307 | xfs_zero_eof( |
Christoph Hellwig | 193aec1 | 2012-03-27 10:34:49 -0400 | [diff] [blame] | 308 | struct xfs_inode *ip, |
| 309 | xfs_off_t offset, /* starting I/O offset */ |
Dave Chinner | 5885ebd | 2015-02-23 22:37:08 +1100 | [diff] [blame] | 310 | xfs_fsize_t isize, /* current inode size */ |
| 311 | bool *did_zeroing) |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 312 | { |
Christoph Hellwig | 193aec1 | 2012-03-27 10:34:49 -0400 | [diff] [blame] | 313 | ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL)); |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 314 | ASSERT(offset > isize); |
| 315 | |
Brian Foster | 0a50f16 | 2015-10-12 16:02:08 +1100 | [diff] [blame] | 316 | trace_xfs_zero_eof(ip, isize, offset - isize); |
Christoph Hellwig | 570b621 | 2016-06-21 09:57:26 +1000 | [diff] [blame] | 317 | return xfs_zero_range(ip, isize, offset - isize, did_zeroing); |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 318 | } |
| 319 | |
Dave Chinner | f0d26e8 | 2011-01-11 10:15:36 +1100 | [diff] [blame] | 320 | /* |
Dave Chinner | 4d8d158 | 2011-01-11 10:23:42 +1100 | [diff] [blame] | 321 | * Common pre-write limit and setup checks. |
| 322 | * |
Christoph Hellwig | 5bf1f26 | 2011-12-18 20:00:13 +0000 | [diff] [blame] | 323 | * Called with the iolocked held either shared and exclusive according to |
| 324 | * @iolock, and returns with it held. Might upgrade the iolock to exclusive |
| 325 | * if called for a direct write beyond i_size. |
Dave Chinner | 4d8d158 | 2011-01-11 10:23:42 +1100 | [diff] [blame] | 326 | */ |
| 327 | STATIC ssize_t |
| 328 | xfs_file_aio_write_checks( |
Al Viro | 99733fa | 2015-04-07 14:25:18 -0400 | [diff] [blame] | 329 | struct kiocb *iocb, |
| 330 | struct iov_iter *from, |
Dave Chinner | 4d8d158 | 2011-01-11 10:23:42 +1100 | [diff] [blame] | 331 | int *iolock) |
| 332 | { |
Al Viro | 99733fa | 2015-04-07 14:25:18 -0400 | [diff] [blame] | 333 | struct file *file = iocb->ki_filp; |
Dave Chinner | 4d8d158 | 2011-01-11 10:23:42 +1100 | [diff] [blame] | 334 | struct inode *inode = file->f_mapping->host; |
| 335 | struct xfs_inode *ip = XFS_I(inode); |
Al Viro | 3309dd0 | 2015-04-09 12:55:47 -0400 | [diff] [blame] | 336 | ssize_t error = 0; |
Al Viro | 99733fa | 2015-04-07 14:25:18 -0400 | [diff] [blame] | 337 | size_t count = iov_iter_count(from); |
Brian Foster | 3136e8b | 2015-10-12 16:02:05 +1100 | [diff] [blame] | 338 | bool drained_dio = false; |
Dave Chinner | 4d8d158 | 2011-01-11 10:23:42 +1100 | [diff] [blame] | 339 | |
Dave Chinner | 7271d24 | 2011-08-25 07:17:02 +0000 | [diff] [blame] | 340 | restart: |
Al Viro | 3309dd0 | 2015-04-09 12:55:47 -0400 | [diff] [blame] | 341 | error = generic_write_checks(iocb, from); |
| 342 | if (error <= 0) |
Dave Chinner | 4d8d158 | 2011-01-11 10:23:42 +1100 | [diff] [blame] | 343 | return error; |
Dave Chinner | 4d8d158 | 2011-01-11 10:23:42 +1100 | [diff] [blame] | 344 | |
Christoph Hellwig | 6552321 | 2016-11-30 14:33:25 +1100 | [diff] [blame] | 345 | error = xfs_break_layouts(inode, iolock); |
Christoph Hellwig | 781355c | 2015-02-16 11:59:50 +1100 | [diff] [blame] | 346 | if (error) |
| 347 | return error; |
| 348 | |
Christoph Hellwig | 6552321 | 2016-11-30 14:33:25 +1100 | [diff] [blame] | 349 | /* |
| 350 | * For changing security info in file_remove_privs() we need i_rwsem |
| 351 | * exclusively. |
| 352 | */ |
Jan Kara | a6de82c | 2015-05-21 16:05:56 +0200 | [diff] [blame] | 353 | if (*iolock == XFS_IOLOCK_SHARED && !IS_NOSEC(inode)) { |
Christoph Hellwig | 6552321 | 2016-11-30 14:33:25 +1100 | [diff] [blame] | 354 | xfs_iunlock(ip, *iolock); |
Jan Kara | a6de82c | 2015-05-21 16:05:56 +0200 | [diff] [blame] | 355 | *iolock = XFS_IOLOCK_EXCL; |
Christoph Hellwig | 6552321 | 2016-11-30 14:33:25 +1100 | [diff] [blame] | 356 | xfs_ilock(ip, *iolock); |
Jan Kara | a6de82c | 2015-05-21 16:05:56 +0200 | [diff] [blame] | 357 | goto restart; |
| 358 | } |
Dave Chinner | 4d8d158 | 2011-01-11 10:23:42 +1100 | [diff] [blame] | 359 | /* |
| 360 | * If the offset is beyond the size of the file, we need to zero any |
| 361 | * blocks that fall between the existing EOF and the start of this |
Christoph Hellwig | 2813d68 | 2011-12-18 20:00:12 +0000 | [diff] [blame] | 362 | * write. If zeroing is needed and we are currently holding the |
Christoph Hellwig | 467f789 | 2012-03-27 10:34:47 -0400 | [diff] [blame] | 363 | * iolock shared, we need to update it to exclusive which implies |
| 364 | * having to redo all checks before. |
Dave Chinner | b9d5984 | 2015-04-16 22:03:07 +1000 | [diff] [blame] | 365 | * |
| 366 | * We need to serialise against EOF updates that occur in IO |
| 367 | * completions here. We want to make sure that nobody is changing the |
| 368 | * size while we do this check until we have placed an IO barrier (i.e. |
| 369 | * hold the XFS_IOLOCK_EXCL) that prevents new IO from being dispatched. |
| 370 | * The spinlock effectively forms a memory barrier once we have the |
| 371 | * XFS_IOLOCK_EXCL so we are guaranteed to see the latest EOF value |
| 372 | * and hence be able to correctly determine if we need to run zeroing. |
Dave Chinner | 4d8d158 | 2011-01-11 10:23:42 +1100 | [diff] [blame] | 373 | */ |
Dave Chinner | b9d5984 | 2015-04-16 22:03:07 +1000 | [diff] [blame] | 374 | spin_lock(&ip->i_flags_lock); |
Al Viro | 99733fa | 2015-04-07 14:25:18 -0400 | [diff] [blame] | 375 | if (iocb->ki_pos > i_size_read(inode)) { |
Dave Chinner | 5885ebd | 2015-02-23 22:37:08 +1100 | [diff] [blame] | 376 | bool zero = false; |
| 377 | |
Dave Chinner | b9d5984 | 2015-04-16 22:03:07 +1000 | [diff] [blame] | 378 | spin_unlock(&ip->i_flags_lock); |
Brian Foster | 3136e8b | 2015-10-12 16:02:05 +1100 | [diff] [blame] | 379 | if (!drained_dio) { |
| 380 | if (*iolock == XFS_IOLOCK_SHARED) { |
Christoph Hellwig | 6552321 | 2016-11-30 14:33:25 +1100 | [diff] [blame] | 381 | xfs_iunlock(ip, *iolock); |
Brian Foster | 3136e8b | 2015-10-12 16:02:05 +1100 | [diff] [blame] | 382 | *iolock = XFS_IOLOCK_EXCL; |
Christoph Hellwig | 6552321 | 2016-11-30 14:33:25 +1100 | [diff] [blame] | 383 | xfs_ilock(ip, *iolock); |
Brian Foster | 3136e8b | 2015-10-12 16:02:05 +1100 | [diff] [blame] | 384 | iov_iter_reexpand(from, count); |
| 385 | } |
Dave Chinner | 40c63fb | 2015-04-16 22:03:17 +1000 | [diff] [blame] | 386 | /* |
| 387 | * We now have an IO submission barrier in place, but |
| 388 | * AIO can do EOF updates during IO completion and hence |
| 389 | * we now need to wait for all of them to drain. Non-AIO |
| 390 | * DIO will have drained before we are given the |
| 391 | * XFS_IOLOCK_EXCL, and so for most cases this wait is a |
| 392 | * no-op. |
| 393 | */ |
| 394 | inode_dio_wait(inode); |
Brian Foster | 3136e8b | 2015-10-12 16:02:05 +1100 | [diff] [blame] | 395 | drained_dio = true; |
Dave Chinner | 7271d24 | 2011-08-25 07:17:02 +0000 | [diff] [blame] | 396 | goto restart; |
| 397 | } |
Al Viro | 99733fa | 2015-04-07 14:25:18 -0400 | [diff] [blame] | 398 | error = xfs_zero_eof(ip, iocb->ki_pos, i_size_read(inode), &zero); |
Christoph Hellwig | 467f789 | 2012-03-27 10:34:47 -0400 | [diff] [blame] | 399 | if (error) |
| 400 | return error; |
Dave Chinner | b9d5984 | 2015-04-16 22:03:07 +1000 | [diff] [blame] | 401 | } else |
| 402 | spin_unlock(&ip->i_flags_lock); |
Dave Chinner | 4d8d158 | 2011-01-11 10:23:42 +1100 | [diff] [blame] | 403 | |
| 404 | /* |
Christoph Hellwig | 8a9c998 | 2012-02-29 09:53:52 +0000 | [diff] [blame] | 405 | * Updating the timestamps will grab the ilock again from |
| 406 | * xfs_fs_dirty_inode, so we have to call it after dropping the |
| 407 | * lock above. Eventually we should look into a way to avoid |
| 408 | * the pointless lock roundtrip. |
| 409 | */ |
Josef Bacik | c3b2da3 | 2012-03-26 09:59:21 -0400 | [diff] [blame] | 410 | if (likely(!(file->f_mode & FMODE_NOCMTIME))) { |
| 411 | error = file_update_time(file); |
| 412 | if (error) |
| 413 | return error; |
| 414 | } |
Christoph Hellwig | 8a9c998 | 2012-02-29 09:53:52 +0000 | [diff] [blame] | 415 | |
| 416 | /* |
Dave Chinner | 4d8d158 | 2011-01-11 10:23:42 +1100 | [diff] [blame] | 417 | * If we're writing the file then make sure to clear the setuid and |
| 418 | * setgid bits if the process is not being run by root. This keeps |
| 419 | * people from modifying setuid and setgid binaries. |
| 420 | */ |
Jan Kara | a6de82c | 2015-05-21 16:05:56 +0200 | [diff] [blame] | 421 | if (!IS_NOSEC(inode)) |
| 422 | return file_remove_privs(file); |
| 423 | return 0; |
Dave Chinner | 4d8d158 | 2011-01-11 10:23:42 +1100 | [diff] [blame] | 424 | } |
| 425 | |
Christoph Hellwig | acdda3a | 2016-11-30 14:37:15 +1100 | [diff] [blame] | 426 | static int |
| 427 | xfs_dio_write_end_io( |
| 428 | struct kiocb *iocb, |
| 429 | ssize_t size, |
| 430 | unsigned flags) |
| 431 | { |
| 432 | struct inode *inode = file_inode(iocb->ki_filp); |
| 433 | struct xfs_inode *ip = XFS_I(inode); |
| 434 | loff_t offset = iocb->ki_pos; |
| 435 | bool update_size = false; |
| 436 | int error = 0; |
| 437 | |
| 438 | trace_xfs_end_io_direct_write(ip, offset, size); |
| 439 | |
| 440 | if (XFS_FORCED_SHUTDOWN(ip->i_mount)) |
| 441 | return -EIO; |
| 442 | |
| 443 | if (size <= 0) |
| 444 | return size; |
| 445 | |
| 446 | /* |
| 447 | * We need to update the in-core inode size here so that we don't end up |
| 448 | * with the on-disk inode size being outside the in-core inode size. We |
| 449 | * have no other method of updating EOF for AIO, so always do it here |
| 450 | * if necessary. |
| 451 | * |
| 452 | * We need to lock the test/set EOF update as we can be racing with |
| 453 | * other IO completions here to update the EOF. Failing to serialise |
| 454 | * here can result in EOF moving backwards and Bad Things Happen when |
| 455 | * that occurs. |
| 456 | */ |
| 457 | spin_lock(&ip->i_flags_lock); |
| 458 | if (offset + size > i_size_read(inode)) { |
| 459 | i_size_write(inode, offset + size); |
| 460 | update_size = true; |
| 461 | } |
| 462 | spin_unlock(&ip->i_flags_lock); |
| 463 | |
| 464 | if (flags & IOMAP_DIO_COW) { |
| 465 | error = xfs_reflink_end_cow(ip, offset, size); |
| 466 | if (error) |
| 467 | return error; |
| 468 | } |
| 469 | |
| 470 | if (flags & IOMAP_DIO_UNWRITTEN) |
| 471 | error = xfs_iomap_write_unwritten(ip, offset, size); |
| 472 | else if (update_size) |
| 473 | error = xfs_setfilesize(ip, offset, size); |
| 474 | |
| 475 | return error; |
| 476 | } |
| 477 | |
Dave Chinner | 4d8d158 | 2011-01-11 10:23:42 +1100 | [diff] [blame] | 478 | /* |
Dave Chinner | f0d26e8 | 2011-01-11 10:15:36 +1100 | [diff] [blame] | 479 | * xfs_file_dio_aio_write - handle direct IO writes |
| 480 | * |
| 481 | * Lock the inode appropriately to prepare for and issue a direct IO write. |
Dave Chinner | eda7798 | 2011-01-11 10:22:40 +1100 | [diff] [blame] | 482 | * By separating it from the buffered write path we remove all the tricky to |
Dave Chinner | f0d26e8 | 2011-01-11 10:15:36 +1100 | [diff] [blame] | 483 | * follow locking changes and looping. |
| 484 | * |
Dave Chinner | eda7798 | 2011-01-11 10:22:40 +1100 | [diff] [blame] | 485 | * If there are cached pages or we're extending the file, we need IOLOCK_EXCL |
| 486 | * until we're sure the bytes at the new EOF have been zeroed and/or the cached |
| 487 | * pages are flushed out. |
| 488 | * |
| 489 | * In most cases the direct IO writes will be done holding IOLOCK_SHARED |
| 490 | * allowing them to be done in parallel with reads and other direct IO writes. |
| 491 | * However, if the IO is not aligned to filesystem blocks, the direct IO layer |
| 492 | * needs to do sub-block zeroing and that requires serialisation against other |
| 493 | * direct IOs to the same block. In this case we need to serialise the |
| 494 | * submission of the unaligned IOs so that we don't get racing block zeroing in |
| 495 | * the dio layer. To avoid the problem with aio, we also need to wait for |
| 496 | * outstanding IOs to complete so that unwritten extent conversion is completed |
| 497 | * before we try to map the overlapping block. This is currently implemented by |
Christoph Hellwig | 4a06fd2 | 2011-08-23 08:28:13 +0000 | [diff] [blame] | 498 | * hitting it with a big hammer (i.e. inode_dio_wait()). |
Dave Chinner | eda7798 | 2011-01-11 10:22:40 +1100 | [diff] [blame] | 499 | * |
Dave Chinner | f0d26e8 | 2011-01-11 10:15:36 +1100 | [diff] [blame] | 500 | * Returns with locks held indicated by @iolock and errors indicated by |
| 501 | * negative return values. |
| 502 | */ |
| 503 | STATIC ssize_t |
| 504 | xfs_file_dio_aio_write( |
| 505 | struct kiocb *iocb, |
Al Viro | b318891 | 2014-04-02 07:06:30 -0400 | [diff] [blame] | 506 | struct iov_iter *from) |
Dave Chinner | f0d26e8 | 2011-01-11 10:15:36 +1100 | [diff] [blame] | 507 | { |
| 508 | struct file *file = iocb->ki_filp; |
| 509 | struct address_space *mapping = file->f_mapping; |
| 510 | struct inode *inode = mapping->host; |
| 511 | struct xfs_inode *ip = XFS_I(inode); |
| 512 | struct xfs_mount *mp = ip->i_mount; |
| 513 | ssize_t ret = 0; |
Dave Chinner | eda7798 | 2011-01-11 10:22:40 +1100 | [diff] [blame] | 514 | int unaligned_io = 0; |
Christoph Hellwig | d060646 | 2011-12-18 20:00:14 +0000 | [diff] [blame] | 515 | int iolock; |
Al Viro | b318891 | 2014-04-02 07:06:30 -0400 | [diff] [blame] | 516 | size_t count = iov_iter_count(from); |
Christoph Hellwig | acdda3a | 2016-11-30 14:37:15 +1100 | [diff] [blame] | 517 | struct xfs_buftarg *target = XFS_IS_REALTIME_INODE(ip) ? |
Dave Chinner | f0d26e8 | 2011-01-11 10:15:36 +1100 | [diff] [blame] | 518 | mp->m_rtdev_targp : mp->m_ddev_targp; |
| 519 | |
Eric Sandeen | 7c71ee7 | 2014-01-21 16:46:23 -0600 | [diff] [blame] | 520 | /* DIO must be aligned to device logical sector size */ |
Christoph Hellwig | 16d4d43 | 2016-07-20 11:38:55 +1000 | [diff] [blame] | 521 | if ((iocb->ki_pos | count) & target->bt_logical_sectormask) |
Eric Sandeen | b474c7a | 2014-06-22 15:04:54 +1000 | [diff] [blame] | 522 | return -EINVAL; |
Dave Chinner | f0d26e8 | 2011-01-11 10:15:36 +1100 | [diff] [blame] | 523 | |
Christoph Hellwig | 0ee7a3f | 2016-10-20 15:44:14 +1100 | [diff] [blame] | 524 | /* |
| 525 | * Don't take the exclusive iolock here unless the I/O is unaligned to |
| 526 | * the file system block size. We don't need to consider the EOF |
| 527 | * extension case here because xfs_file_aio_write_checks() will relock |
| 528 | * the inode as necessary for EOF zeroing cases and fill out the new |
| 529 | * inode size as appropriate. |
| 530 | */ |
Christoph Hellwig | 1371271 | 2016-04-07 08:51:57 -0700 | [diff] [blame] | 531 | if ((iocb->ki_pos & mp->m_blockmask) || |
Christoph Hellwig | 0ee7a3f | 2016-10-20 15:44:14 +1100 | [diff] [blame] | 532 | ((iocb->ki_pos + count) & mp->m_blockmask)) { |
Dave Chinner | eda7798 | 2011-01-11 10:22:40 +1100 | [diff] [blame] | 533 | unaligned_io = 1; |
Christoph Hellwig | 54a4ef8 | 2017-02-06 13:00:54 -0800 | [diff] [blame] | 534 | |
| 535 | /* |
| 536 | * We can't properly handle unaligned direct I/O to reflink |
| 537 | * files yet, as we can't unshare a partial block. |
| 538 | */ |
| 539 | if (xfs_is_reflink_inode(ip)) { |
| 540 | trace_xfs_reflink_bounce_dio_write(ip, iocb->ki_pos, count); |
| 541 | return -EREMCHG; |
| 542 | } |
Christoph Hellwig | d060646 | 2011-12-18 20:00:14 +0000 | [diff] [blame] | 543 | iolock = XFS_IOLOCK_EXCL; |
Christoph Hellwig | 0ee7a3f | 2016-10-20 15:44:14 +1100 | [diff] [blame] | 544 | } else { |
Christoph Hellwig | d060646 | 2011-12-18 20:00:14 +0000 | [diff] [blame] | 545 | iolock = XFS_IOLOCK_SHARED; |
Christoph Hellwig | c58cb16 | 2011-08-27 14:42:53 +0000 | [diff] [blame] | 546 | } |
Dave Chinner | f0d26e8 | 2011-01-11 10:15:36 +1100 | [diff] [blame] | 547 | |
Goldwyn Rodrigues | 29a5d29 | 2017-06-20 07:05:48 -0500 | [diff] [blame] | 548 | if (!xfs_ilock_nowait(ip, iolock)) { |
| 549 | if (iocb->ki_flags & IOCB_NOWAIT) |
| 550 | return -EAGAIN; |
| 551 | xfs_ilock(ip, iolock); |
| 552 | } |
Christoph Hellwig | 0ee7a3f | 2016-10-20 15:44:14 +1100 | [diff] [blame] | 553 | |
Al Viro | 99733fa | 2015-04-07 14:25:18 -0400 | [diff] [blame] | 554 | ret = xfs_file_aio_write_checks(iocb, from, &iolock); |
Dave Chinner | 4d8d158 | 2011-01-11 10:23:42 +1100 | [diff] [blame] | 555 | if (ret) |
Christoph Hellwig | d060646 | 2011-12-18 20:00:14 +0000 | [diff] [blame] | 556 | goto out; |
Al Viro | 99733fa | 2015-04-07 14:25:18 -0400 | [diff] [blame] | 557 | count = iov_iter_count(from); |
Dave Chinner | f0d26e8 | 2011-01-11 10:15:36 +1100 | [diff] [blame] | 558 | |
Dave Chinner | eda7798 | 2011-01-11 10:22:40 +1100 | [diff] [blame] | 559 | /* |
| 560 | * If we are doing unaligned IO, wait for all other IO to drain, |
Christoph Hellwig | 0ee7a3f | 2016-10-20 15:44:14 +1100 | [diff] [blame] | 561 | * otherwise demote the lock if we had to take the exclusive lock |
| 562 | * for other reasons in xfs_file_aio_write_checks. |
Dave Chinner | eda7798 | 2011-01-11 10:22:40 +1100 | [diff] [blame] | 563 | */ |
Goldwyn Rodrigues | 29a5d29 | 2017-06-20 07:05:48 -0500 | [diff] [blame] | 564 | if (unaligned_io) { |
| 565 | /* If we are going to wait for other DIO to finish, bail */ |
| 566 | if (iocb->ki_flags & IOCB_NOWAIT) { |
| 567 | if (atomic_read(&inode->i_dio_count)) |
| 568 | return -EAGAIN; |
| 569 | } else { |
| 570 | inode_dio_wait(inode); |
| 571 | } |
| 572 | } else if (iolock == XFS_IOLOCK_EXCL) { |
Christoph Hellwig | 6552321 | 2016-11-30 14:33:25 +1100 | [diff] [blame] | 573 | xfs_ilock_demote(ip, XFS_IOLOCK_EXCL); |
Christoph Hellwig | d060646 | 2011-12-18 20:00:14 +0000 | [diff] [blame] | 574 | iolock = XFS_IOLOCK_SHARED; |
Dave Chinner | f0d26e8 | 2011-01-11 10:15:36 +1100 | [diff] [blame] | 575 | } |
| 576 | |
Christoph Hellwig | 3176c3e | 2016-07-20 11:31:42 +1000 | [diff] [blame] | 577 | trace_xfs_file_direct_write(ip, count, iocb->ki_pos); |
Christoph Hellwig | acdda3a | 2016-11-30 14:37:15 +1100 | [diff] [blame] | 578 | ret = iomap_dio_rw(iocb, from, &xfs_iomap_ops, xfs_dio_write_end_io); |
Christoph Hellwig | d060646 | 2011-12-18 20:00:14 +0000 | [diff] [blame] | 579 | out: |
Christoph Hellwig | 6552321 | 2016-11-30 14:33:25 +1100 | [diff] [blame] | 580 | xfs_iunlock(ip, iolock); |
Christoph Hellwig | d060646 | 2011-12-18 20:00:14 +0000 | [diff] [blame] | 581 | |
Dave Chinner | 6b698ed | 2015-06-04 09:18:53 +1000 | [diff] [blame] | 582 | /* |
Christoph Hellwig | 16d4d43 | 2016-07-20 11:38:55 +1000 | [diff] [blame] | 583 | * No fallback to buffered IO on errors for XFS, direct IO will either |
| 584 | * complete fully or fail. |
Dave Chinner | 6b698ed | 2015-06-04 09:18:53 +1000 | [diff] [blame] | 585 | */ |
Christoph Hellwig | 16d4d43 | 2016-07-20 11:38:55 +1000 | [diff] [blame] | 586 | ASSERT(ret < 0 || ret == count); |
| 587 | return ret; |
| 588 | } |
| 589 | |
Arnd Bergmann | f021bd0 | 2016-07-22 09:50:55 +1000 | [diff] [blame] | 590 | static noinline ssize_t |
Christoph Hellwig | 16d4d43 | 2016-07-20 11:38:55 +1000 | [diff] [blame] | 591 | xfs_file_dax_write( |
| 592 | struct kiocb *iocb, |
| 593 | struct iov_iter *from) |
| 594 | { |
Christoph Hellwig | 6c31f495 | 2016-09-19 11:28:38 +1000 | [diff] [blame] | 595 | struct inode *inode = iocb->ki_filp->f_mapping->host; |
Christoph Hellwig | 16d4d43 | 2016-07-20 11:38:55 +1000 | [diff] [blame] | 596 | struct xfs_inode *ip = XFS_I(inode); |
Christoph Hellwig | 17879e8 | 2016-09-19 11:24:50 +1000 | [diff] [blame] | 597 | int iolock = XFS_IOLOCK_EXCL; |
Christoph Hellwig | 6c31f495 | 2016-09-19 11:28:38 +1000 | [diff] [blame] | 598 | ssize_t ret, error = 0; |
| 599 | size_t count; |
| 600 | loff_t pos; |
Christoph Hellwig | 16d4d43 | 2016-07-20 11:38:55 +1000 | [diff] [blame] | 601 | |
Goldwyn Rodrigues | 29a5d29 | 2017-06-20 07:05:48 -0500 | [diff] [blame] | 602 | if (!xfs_ilock_nowait(ip, iolock)) { |
| 603 | if (iocb->ki_flags & IOCB_NOWAIT) |
| 604 | return -EAGAIN; |
| 605 | xfs_ilock(ip, iolock); |
| 606 | } |
| 607 | |
Christoph Hellwig | 16d4d43 | 2016-07-20 11:38:55 +1000 | [diff] [blame] | 608 | ret = xfs_file_aio_write_checks(iocb, from, &iolock); |
| 609 | if (ret) |
| 610 | goto out; |
| 611 | |
Christoph Hellwig | 6c31f495 | 2016-09-19 11:28:38 +1000 | [diff] [blame] | 612 | pos = iocb->ki_pos; |
| 613 | count = iov_iter_count(from); |
Dave Chinner | 8b2180b | 2016-08-17 08:31:33 +1000 | [diff] [blame] | 614 | |
Christoph Hellwig | 6c31f495 | 2016-09-19 11:28:38 +1000 | [diff] [blame] | 615 | trace_xfs_file_dax_write(ip, count, pos); |
Ross Zwisler | 11c59c9 | 2016-11-08 11:32:46 +1100 | [diff] [blame] | 616 | ret = dax_iomap_rw(iocb, from, &xfs_iomap_ops); |
Christoph Hellwig | 6c31f495 | 2016-09-19 11:28:38 +1000 | [diff] [blame] | 617 | if (ret > 0 && iocb->ki_pos > i_size_read(inode)) { |
| 618 | i_size_write(inode, iocb->ki_pos); |
| 619 | error = xfs_setfilesize(ip, pos, ret); |
Christoph Hellwig | 16d4d43 | 2016-07-20 11:38:55 +1000 | [diff] [blame] | 620 | } |
Christoph Hellwig | 16d4d43 | 2016-07-20 11:38:55 +1000 | [diff] [blame] | 621 | out: |
Christoph Hellwig | 6552321 | 2016-11-30 14:33:25 +1100 | [diff] [blame] | 622 | xfs_iunlock(ip, iolock); |
Christoph Hellwig | 6c31f495 | 2016-09-19 11:28:38 +1000 | [diff] [blame] | 623 | return error ? error : ret; |
Dave Chinner | f0d26e8 | 2011-01-11 10:15:36 +1100 | [diff] [blame] | 624 | } |
| 625 | |
Christoph Hellwig | 00258e3 | 2010-02-15 09:44:47 +0000 | [diff] [blame] | 626 | STATIC ssize_t |
Dave Chinner | 637bbc7 | 2011-01-11 10:17:30 +1100 | [diff] [blame] | 627 | xfs_file_buffered_aio_write( |
| 628 | struct kiocb *iocb, |
Al Viro | b318891 | 2014-04-02 07:06:30 -0400 | [diff] [blame] | 629 | struct iov_iter *from) |
Dave Chinner | 637bbc7 | 2011-01-11 10:17:30 +1100 | [diff] [blame] | 630 | { |
| 631 | struct file *file = iocb->ki_filp; |
| 632 | struct address_space *mapping = file->f_mapping; |
| 633 | struct inode *inode = mapping->host; |
| 634 | struct xfs_inode *ip = XFS_I(inode); |
| 635 | ssize_t ret; |
| 636 | int enospc = 0; |
Brian Foster | c315509 | 2017-01-27 23:22:56 -0800 | [diff] [blame] | 637 | int iolock; |
Dave Chinner | 637bbc7 | 2011-01-11 10:17:30 +1100 | [diff] [blame] | 638 | |
Brian Foster | c315509 | 2017-01-27 23:22:56 -0800 | [diff] [blame] | 639 | write_retry: |
| 640 | iolock = XFS_IOLOCK_EXCL; |
Christoph Hellwig | 6552321 | 2016-11-30 14:33:25 +1100 | [diff] [blame] | 641 | xfs_ilock(ip, iolock); |
Dave Chinner | 637bbc7 | 2011-01-11 10:17:30 +1100 | [diff] [blame] | 642 | |
Al Viro | 99733fa | 2015-04-07 14:25:18 -0400 | [diff] [blame] | 643 | ret = xfs_file_aio_write_checks(iocb, from, &iolock); |
Dave Chinner | 4d8d158 | 2011-01-11 10:23:42 +1100 | [diff] [blame] | 644 | if (ret) |
Christoph Hellwig | d060646 | 2011-12-18 20:00:14 +0000 | [diff] [blame] | 645 | goto out; |
Dave Chinner | 637bbc7 | 2011-01-11 10:17:30 +1100 | [diff] [blame] | 646 | |
| 647 | /* We can write back this queue in page reclaim */ |
Christoph Hellwig | de1414a | 2015-01-14 10:42:36 +0100 | [diff] [blame] | 648 | current->backing_dev_info = inode_to_bdi(inode); |
Dave Chinner | 637bbc7 | 2011-01-11 10:17:30 +1100 | [diff] [blame] | 649 | |
Christoph Hellwig | 3176c3e | 2016-07-20 11:31:42 +1000 | [diff] [blame] | 650 | trace_xfs_file_buffered_write(ip, iov_iter_count(from), iocb->ki_pos); |
Christoph Hellwig | 68a9f5e | 2016-06-21 09:53:44 +1000 | [diff] [blame] | 651 | ret = iomap_file_buffered_write(iocb, from, &xfs_iomap_ops); |
Al Viro | 0a64bc2 | 2014-02-11 22:25:22 -0500 | [diff] [blame] | 652 | if (likely(ret >= 0)) |
Al Viro | 99733fa | 2015-04-07 14:25:18 -0400 | [diff] [blame] | 653 | iocb->ki_pos += ret; |
Brian Foster | dc06f398 | 2014-07-24 19:49:28 +1000 | [diff] [blame] | 654 | |
Dave Chinner | 637bbc7 | 2011-01-11 10:17:30 +1100 | [diff] [blame] | 655 | /* |
Brian Foster | dc06f398 | 2014-07-24 19:49:28 +1000 | [diff] [blame] | 656 | * If we hit a space limit, try to free up some lingering preallocated |
| 657 | * space before returning an error. In the case of ENOSPC, first try to |
| 658 | * write back all dirty inodes to free up some of the excess reserved |
| 659 | * metadata space. This reduces the chances that the eofblocks scan |
| 660 | * waits on dirty mappings. Since xfs_flush_inodes() is serialized, this |
| 661 | * also behaves as a filter to prevent too many eofblocks scans from |
| 662 | * running at the same time. |
Dave Chinner | 637bbc7 | 2011-01-11 10:17:30 +1100 | [diff] [blame] | 663 | */ |
Brian Foster | dc06f398 | 2014-07-24 19:49:28 +1000 | [diff] [blame] | 664 | if (ret == -EDQUOT && !enospc) { |
Brian Foster | c315509 | 2017-01-27 23:22:56 -0800 | [diff] [blame] | 665 | xfs_iunlock(ip, iolock); |
Brian Foster | dc06f398 | 2014-07-24 19:49:28 +1000 | [diff] [blame] | 666 | enospc = xfs_inode_free_quota_eofblocks(ip); |
| 667 | if (enospc) |
| 668 | goto write_retry; |
Darrick J. Wong | 83104d4 | 2016-10-03 09:11:46 -0700 | [diff] [blame] | 669 | enospc = xfs_inode_free_quota_cowblocks(ip); |
| 670 | if (enospc) |
| 671 | goto write_retry; |
Brian Foster | c315509 | 2017-01-27 23:22:56 -0800 | [diff] [blame] | 672 | iolock = 0; |
Brian Foster | dc06f398 | 2014-07-24 19:49:28 +1000 | [diff] [blame] | 673 | } else if (ret == -ENOSPC && !enospc) { |
| 674 | struct xfs_eofblocks eofb = {0}; |
| 675 | |
Dave Chinner | 637bbc7 | 2011-01-11 10:17:30 +1100 | [diff] [blame] | 676 | enospc = 1; |
Dave Chinner | 9aa0500 | 2012-10-08 21:56:04 +1100 | [diff] [blame] | 677 | xfs_flush_inodes(ip->i_mount); |
Brian Foster | c315509 | 2017-01-27 23:22:56 -0800 | [diff] [blame] | 678 | |
| 679 | xfs_iunlock(ip, iolock); |
Brian Foster | dc06f398 | 2014-07-24 19:49:28 +1000 | [diff] [blame] | 680 | eofb.eof_flags = XFS_EOF_FLAGS_SYNC; |
| 681 | xfs_icache_free_eofblocks(ip->i_mount, &eofb); |
Brian Foster | cf2cb78 | 2017-06-20 14:36:19 -0700 | [diff] [blame] | 682 | xfs_icache_free_cowblocks(ip->i_mount, &eofb); |
Dave Chinner | 9aa0500 | 2012-10-08 21:56:04 +1100 | [diff] [blame] | 683 | goto write_retry; |
Dave Chinner | 637bbc7 | 2011-01-11 10:17:30 +1100 | [diff] [blame] | 684 | } |
Christoph Hellwig | d060646 | 2011-12-18 20:00:14 +0000 | [diff] [blame] | 685 | |
Dave Chinner | 637bbc7 | 2011-01-11 10:17:30 +1100 | [diff] [blame] | 686 | current->backing_dev_info = NULL; |
Christoph Hellwig | d060646 | 2011-12-18 20:00:14 +0000 | [diff] [blame] | 687 | out: |
Brian Foster | c315509 | 2017-01-27 23:22:56 -0800 | [diff] [blame] | 688 | if (iolock) |
| 689 | xfs_iunlock(ip, iolock); |
Dave Chinner | 637bbc7 | 2011-01-11 10:17:30 +1100 | [diff] [blame] | 690 | return ret; |
| 691 | } |
| 692 | |
| 693 | STATIC ssize_t |
Al Viro | bf97f3bc | 2014-04-03 14:20:23 -0400 | [diff] [blame] | 694 | xfs_file_write_iter( |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 695 | struct kiocb *iocb, |
Al Viro | bf97f3bc | 2014-04-03 14:20:23 -0400 | [diff] [blame] | 696 | struct iov_iter *from) |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 697 | { |
| 698 | struct file *file = iocb->ki_filp; |
| 699 | struct address_space *mapping = file->f_mapping; |
| 700 | struct inode *inode = mapping->host; |
Christoph Hellwig | 00258e3 | 2010-02-15 09:44:47 +0000 | [diff] [blame] | 701 | struct xfs_inode *ip = XFS_I(inode); |
Dave Chinner | 637bbc7 | 2011-01-11 10:17:30 +1100 | [diff] [blame] | 702 | ssize_t ret; |
Al Viro | bf97f3bc | 2014-04-03 14:20:23 -0400 | [diff] [blame] | 703 | size_t ocount = iov_iter_count(from); |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 704 | |
Bill O'Donnell | ff6d6af | 2015-10-12 18:21:22 +1100 | [diff] [blame] | 705 | XFS_STATS_INC(ip->i_mount, xs_write_calls); |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 706 | |
Dave Chinner | 637bbc7 | 2011-01-11 10:17:30 +1100 | [diff] [blame] | 707 | if (ocount == 0) |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 708 | return 0; |
| 709 | |
Al Viro | bf97f3bc | 2014-04-03 14:20:23 -0400 | [diff] [blame] | 710 | if (XFS_FORCED_SHUTDOWN(ip->i_mount)) |
| 711 | return -EIO; |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 712 | |
Christoph Hellwig | 16d4d43 | 2016-07-20 11:38:55 +1000 | [diff] [blame] | 713 | if (IS_DAX(inode)) |
| 714 | ret = xfs_file_dax_write(iocb, from); |
Darrick J. Wong | 0613f16 | 2016-10-03 09:11:37 -0700 | [diff] [blame] | 715 | else if (iocb->ki_flags & IOCB_DIRECT) { |
| 716 | /* |
| 717 | * Allow a directio write to fall back to a buffered |
| 718 | * write *only* in the case that we're doing a reflink |
| 719 | * CoW. In all other directio scenarios we do not |
| 720 | * allow an operation to fall back to buffered mode. |
| 721 | */ |
Al Viro | bf97f3bc | 2014-04-03 14:20:23 -0400 | [diff] [blame] | 722 | ret = xfs_file_dio_aio_write(iocb, from); |
Darrick J. Wong | 0613f16 | 2016-10-03 09:11:37 -0700 | [diff] [blame] | 723 | if (ret == -EREMCHG) |
| 724 | goto buffered; |
| 725 | } else { |
| 726 | buffered: |
Al Viro | bf97f3bc | 2014-04-03 14:20:23 -0400 | [diff] [blame] | 727 | ret = xfs_file_buffered_aio_write(iocb, from); |
Darrick J. Wong | 0613f16 | 2016-10-03 09:11:37 -0700 | [diff] [blame] | 728 | } |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 729 | |
Christoph Hellwig | d060646 | 2011-12-18 20:00:14 +0000 | [diff] [blame] | 730 | if (ret > 0) { |
Bill O'Donnell | ff6d6af | 2015-10-12 18:21:22 +1100 | [diff] [blame] | 731 | XFS_STATS_ADD(ip->i_mount, xs_write_bytes, ret); |
Christoph Hellwig | ce7ae151 | 2011-12-18 20:00:11 +0000 | [diff] [blame] | 732 | |
Christoph Hellwig | d060646 | 2011-12-18 20:00:14 +0000 | [diff] [blame] | 733 | /* Handle various SYNC-type writes */ |
Christoph Hellwig | e259221 | 2016-04-07 08:52:01 -0700 | [diff] [blame] | 734 | ret = generic_write_sync(iocb, ret); |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 735 | } |
Dave Chinner | a363f0c | 2011-01-11 10:13:53 +1100 | [diff] [blame] | 736 | return ret; |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 737 | } |
| 738 | |
Namjae Jeon | a904b1c | 2015-03-25 15:08:56 +1100 | [diff] [blame] | 739 | #define XFS_FALLOC_FL_SUPPORTED \ |
| 740 | (FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE | \ |
| 741 | FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_ZERO_RANGE | \ |
Darrick J. Wong | 98cc2db | 2016-10-03 09:11:43 -0700 | [diff] [blame] | 742 | FALLOC_FL_INSERT_RANGE | FALLOC_FL_UNSHARE_RANGE) |
Namjae Jeon | a904b1c | 2015-03-25 15:08:56 +1100 | [diff] [blame] | 743 | |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 744 | STATIC long |
| 745 | xfs_file_fallocate( |
Christoph Hellwig | 83aee9e | 2013-10-12 00:55:07 -0700 | [diff] [blame] | 746 | struct file *file, |
| 747 | int mode, |
| 748 | loff_t offset, |
| 749 | loff_t len) |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 750 | { |
Christoph Hellwig | 83aee9e | 2013-10-12 00:55:07 -0700 | [diff] [blame] | 751 | struct inode *inode = file_inode(file); |
| 752 | struct xfs_inode *ip = XFS_I(inode); |
Christoph Hellwig | 83aee9e | 2013-10-12 00:55:07 -0700 | [diff] [blame] | 753 | long error; |
Christoph Hellwig | 8add71c | 2015-02-02 09:53:56 +1100 | [diff] [blame] | 754 | enum xfs_prealloc_flags flags = 0; |
Christoph Hellwig | 781355c | 2015-02-16 11:59:50 +1100 | [diff] [blame] | 755 | uint iolock = XFS_IOLOCK_EXCL; |
Christoph Hellwig | 83aee9e | 2013-10-12 00:55:07 -0700 | [diff] [blame] | 756 | loff_t new_size = 0; |
Namjae Jeon | a904b1c | 2015-03-25 15:08:56 +1100 | [diff] [blame] | 757 | bool do_file_insert = 0; |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 758 | |
Christoph Hellwig | 83aee9e | 2013-10-12 00:55:07 -0700 | [diff] [blame] | 759 | if (!S_ISREG(inode->i_mode)) |
| 760 | return -EINVAL; |
Namjae Jeon | a904b1c | 2015-03-25 15:08:56 +1100 | [diff] [blame] | 761 | if (mode & ~XFS_FALLOC_FL_SUPPORTED) |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 762 | return -EOPNOTSUPP; |
| 763 | |
Christoph Hellwig | 781355c | 2015-02-16 11:59:50 +1100 | [diff] [blame] | 764 | xfs_ilock(ip, iolock); |
Christoph Hellwig | 6552321 | 2016-11-30 14:33:25 +1100 | [diff] [blame] | 765 | error = xfs_break_layouts(inode, &iolock); |
Christoph Hellwig | 781355c | 2015-02-16 11:59:50 +1100 | [diff] [blame] | 766 | if (error) |
| 767 | goto out_unlock; |
| 768 | |
Dave Chinner | e8e9ad4 | 2015-02-23 21:45:32 +1100 | [diff] [blame] | 769 | xfs_ilock(ip, XFS_MMAPLOCK_EXCL); |
| 770 | iolock |= XFS_MMAPLOCK_EXCL; |
| 771 | |
Christoph Hellwig | 83aee9e | 2013-10-12 00:55:07 -0700 | [diff] [blame] | 772 | if (mode & FALLOC_FL_PUNCH_HOLE) { |
| 773 | error = xfs_free_file_space(ip, offset, len); |
| 774 | if (error) |
| 775 | goto out_unlock; |
Namjae Jeon | e1d8fb8 | 2014-02-24 10:58:19 +1100 | [diff] [blame] | 776 | } else if (mode & FALLOC_FL_COLLAPSE_RANGE) { |
Fabian Frederick | 9340747 | 2017-02-27 14:28:32 -0800 | [diff] [blame] | 777 | unsigned int blksize_mask = i_blocksize(inode) - 1; |
Namjae Jeon | e1d8fb8 | 2014-02-24 10:58:19 +1100 | [diff] [blame] | 778 | |
| 779 | if (offset & blksize_mask || len & blksize_mask) { |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 780 | error = -EINVAL; |
Namjae Jeon | e1d8fb8 | 2014-02-24 10:58:19 +1100 | [diff] [blame] | 781 | goto out_unlock; |
| 782 | } |
| 783 | |
Lukas Czerner | 23fffa9 | 2014-04-12 09:56:41 -0400 | [diff] [blame] | 784 | /* |
| 785 | * There is no need to overlap collapse range with EOF, |
| 786 | * in which case it is effectively a truncate operation |
| 787 | */ |
| 788 | if (offset + len >= i_size_read(inode)) { |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 789 | error = -EINVAL; |
Lukas Czerner | 23fffa9 | 2014-04-12 09:56:41 -0400 | [diff] [blame] | 790 | goto out_unlock; |
| 791 | } |
| 792 | |
Namjae Jeon | e1d8fb8 | 2014-02-24 10:58:19 +1100 | [diff] [blame] | 793 | new_size = i_size_read(inode) - len; |
| 794 | |
| 795 | error = xfs_collapse_file_space(ip, offset, len); |
| 796 | if (error) |
| 797 | goto out_unlock; |
Namjae Jeon | a904b1c | 2015-03-25 15:08:56 +1100 | [diff] [blame] | 798 | } else if (mode & FALLOC_FL_INSERT_RANGE) { |
Fabian Frederick | 9340747 | 2017-02-27 14:28:32 -0800 | [diff] [blame] | 799 | unsigned int blksize_mask = i_blocksize(inode) - 1; |
Namjae Jeon | a904b1c | 2015-03-25 15:08:56 +1100 | [diff] [blame] | 800 | |
| 801 | new_size = i_size_read(inode) + len; |
| 802 | if (offset & blksize_mask || len & blksize_mask) { |
| 803 | error = -EINVAL; |
| 804 | goto out_unlock; |
| 805 | } |
| 806 | |
| 807 | /* check the new inode size does not wrap through zero */ |
| 808 | if (new_size > inode->i_sb->s_maxbytes) { |
| 809 | error = -EFBIG; |
| 810 | goto out_unlock; |
| 811 | } |
| 812 | |
| 813 | /* Offset should be less than i_size */ |
| 814 | if (offset >= i_size_read(inode)) { |
| 815 | error = -EINVAL; |
| 816 | goto out_unlock; |
| 817 | } |
| 818 | do_file_insert = 1; |
Christoph Hellwig | 83aee9e | 2013-10-12 00:55:07 -0700 | [diff] [blame] | 819 | } else { |
Christoph Hellwig | 8add71c | 2015-02-02 09:53:56 +1100 | [diff] [blame] | 820 | flags |= XFS_PREALLOC_SET; |
| 821 | |
Christoph Hellwig | 83aee9e | 2013-10-12 00:55:07 -0700 | [diff] [blame] | 822 | if (!(mode & FALLOC_FL_KEEP_SIZE) && |
| 823 | offset + len > i_size_read(inode)) { |
| 824 | new_size = offset + len; |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 825 | error = inode_newsize_ok(inode, new_size); |
Christoph Hellwig | 83aee9e | 2013-10-12 00:55:07 -0700 | [diff] [blame] | 826 | if (error) |
| 827 | goto out_unlock; |
| 828 | } |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 829 | |
Lukas Czerner | 376ba31 | 2014-03-13 19:07:58 +1100 | [diff] [blame] | 830 | if (mode & FALLOC_FL_ZERO_RANGE) |
| 831 | error = xfs_zero_file_space(ip, offset, len); |
Darrick J. Wong | 98cc2db | 2016-10-03 09:11:43 -0700 | [diff] [blame] | 832 | else { |
| 833 | if (mode & FALLOC_FL_UNSHARE_RANGE) { |
| 834 | error = xfs_reflink_unshare(ip, offset, len); |
| 835 | if (error) |
| 836 | goto out_unlock; |
| 837 | } |
Lukas Czerner | 376ba31 | 2014-03-13 19:07:58 +1100 | [diff] [blame] | 838 | error = xfs_alloc_file_space(ip, offset, len, |
| 839 | XFS_BMAPI_PREALLOC); |
Darrick J. Wong | 98cc2db | 2016-10-03 09:11:43 -0700 | [diff] [blame] | 840 | } |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 841 | if (error) |
| 842 | goto out_unlock; |
| 843 | } |
| 844 | |
Christoph Hellwig | 83aee9e | 2013-10-12 00:55:07 -0700 | [diff] [blame] | 845 | if (file->f_flags & O_DSYNC) |
Christoph Hellwig | 8add71c | 2015-02-02 09:53:56 +1100 | [diff] [blame] | 846 | flags |= XFS_PREALLOC_SYNC; |
| 847 | |
| 848 | error = xfs_update_prealloc_flags(ip, flags); |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 849 | if (error) |
| 850 | goto out_unlock; |
| 851 | |
| 852 | /* Change file size if needed */ |
| 853 | if (new_size) { |
| 854 | struct iattr iattr; |
| 855 | |
| 856 | iattr.ia_valid = ATTR_SIZE; |
| 857 | iattr.ia_size = new_size; |
Jan Kara | 69bca80 | 2016-05-26 14:46:43 +0200 | [diff] [blame] | 858 | error = xfs_vn_setattr_size(file_dentry(file), &iattr); |
Namjae Jeon | a904b1c | 2015-03-25 15:08:56 +1100 | [diff] [blame] | 859 | if (error) |
| 860 | goto out_unlock; |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 861 | } |
| 862 | |
Namjae Jeon | a904b1c | 2015-03-25 15:08:56 +1100 | [diff] [blame] | 863 | /* |
| 864 | * Perform hole insertion now that the file size has been |
| 865 | * updated so that if we crash during the operation we don't |
| 866 | * leave shifted extents past EOF and hence losing access to |
| 867 | * the data that is contained within them. |
| 868 | */ |
| 869 | if (do_file_insert) |
| 870 | error = xfs_insert_file_space(ip, offset, len); |
| 871 | |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 872 | out_unlock: |
Christoph Hellwig | 781355c | 2015-02-16 11:59:50 +1100 | [diff] [blame] | 873 | xfs_iunlock(ip, iolock); |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 874 | return error; |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 875 | } |
| 876 | |
Darrick J. Wong | 9fe2604 | 2016-10-03 09:11:40 -0700 | [diff] [blame] | 877 | STATIC int |
| 878 | xfs_file_clone_range( |
| 879 | struct file *file_in, |
| 880 | loff_t pos_in, |
| 881 | struct file *file_out, |
| 882 | loff_t pos_out, |
| 883 | u64 len) |
| 884 | { |
Christoph Hellwig | 5faaf4f | 2016-10-20 15:50:07 +1100 | [diff] [blame] | 885 | return xfs_reflink_remap_range(file_in, pos_in, file_out, pos_out, |
Darrick J. Wong | cc71466 | 2016-10-03 09:11:41 -0700 | [diff] [blame] | 886 | len, false); |
| 887 | } |
| 888 | |
Darrick J. Wong | cc71466 | 2016-10-03 09:11:41 -0700 | [diff] [blame] | 889 | STATIC ssize_t |
| 890 | xfs_file_dedupe_range( |
| 891 | struct file *src_file, |
| 892 | u64 loff, |
| 893 | u64 len, |
| 894 | struct file *dst_file, |
| 895 | u64 dst_loff) |
| 896 | { |
| 897 | int error; |
| 898 | |
Christoph Hellwig | 5faaf4f | 2016-10-20 15:50:07 +1100 | [diff] [blame] | 899 | error = xfs_reflink_remap_range(src_file, loff, dst_file, dst_loff, |
Darrick J. Wong | cc71466 | 2016-10-03 09:11:41 -0700 | [diff] [blame] | 900 | len, true); |
| 901 | if (error) |
| 902 | return error; |
| 903 | return len; |
Darrick J. Wong | 9fe2604 | 2016-10-03 09:11:40 -0700 | [diff] [blame] | 904 | } |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 905 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 906 | STATIC int |
Nathan Scott | 3562fd4 | 2006-03-14 14:00:35 +1100 | [diff] [blame] | 907 | xfs_file_open( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 908 | struct inode *inode, |
Christoph Hellwig | f999a5b | 2008-11-28 14:23:32 +1100 | [diff] [blame] | 909 | struct file *file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 910 | { |
Christoph Hellwig | f999a5b | 2008-11-28 14:23:32 +1100 | [diff] [blame] | 911 | if (!(file->f_flags & O_LARGEFILE) && i_size_read(inode) > MAX_NON_LFS) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 912 | return -EFBIG; |
Christoph Hellwig | f999a5b | 2008-11-28 14:23:32 +1100 | [diff] [blame] | 913 | if (XFS_FORCED_SHUTDOWN(XFS_M(inode->i_sb))) |
| 914 | return -EIO; |
Goldwyn Rodrigues | 29a5d29 | 2017-06-20 07:05:48 -0500 | [diff] [blame] | 915 | file->f_mode |= FMODE_AIO_NOWAIT; |
Christoph Hellwig | f999a5b | 2008-11-28 14:23:32 +1100 | [diff] [blame] | 916 | return 0; |
| 917 | } |
| 918 | |
| 919 | STATIC int |
| 920 | xfs_dir_open( |
| 921 | struct inode *inode, |
| 922 | struct file *file) |
| 923 | { |
| 924 | struct xfs_inode *ip = XFS_I(inode); |
| 925 | int mode; |
| 926 | int error; |
| 927 | |
| 928 | error = xfs_file_open(inode, file); |
| 929 | if (error) |
| 930 | return error; |
| 931 | |
| 932 | /* |
| 933 | * If there are any blocks, read-ahead block 0 as we're almost |
| 934 | * certain to have the next operation be a read there. |
| 935 | */ |
Christoph Hellwig | 309ecac8 | 2013-12-06 12:30:09 -0800 | [diff] [blame] | 936 | mode = xfs_ilock_data_map_shared(ip); |
Christoph Hellwig | f999a5b | 2008-11-28 14:23:32 +1100 | [diff] [blame] | 937 | if (ip->i_d.di_nextents > 0) |
Darrick J. Wong | 7a652bb | 2017-02-02 15:13:58 -0800 | [diff] [blame] | 938 | error = xfs_dir3_data_readahead(ip, 0, -1); |
Christoph Hellwig | f999a5b | 2008-11-28 14:23:32 +1100 | [diff] [blame] | 939 | xfs_iunlock(ip, mode); |
Darrick J. Wong | 7a652bb | 2017-02-02 15:13:58 -0800 | [diff] [blame] | 940 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 941 | } |
| 942 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 943 | STATIC int |
Nathan Scott | 3562fd4 | 2006-03-14 14:00:35 +1100 | [diff] [blame] | 944 | xfs_file_release( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 945 | struct inode *inode, |
| 946 | struct file *filp) |
| 947 | { |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 948 | return xfs_release(XFS_I(inode)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 949 | } |
| 950 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 951 | STATIC int |
Nathan Scott | 3562fd4 | 2006-03-14 14:00:35 +1100 | [diff] [blame] | 952 | xfs_file_readdir( |
Al Viro | b822755 | 2013-05-22 17:07:56 -0400 | [diff] [blame] | 953 | struct file *file, |
| 954 | struct dir_context *ctx) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 955 | { |
Al Viro | b822755 | 2013-05-22 17:07:56 -0400 | [diff] [blame] | 956 | struct inode *inode = file_inode(file); |
Christoph Hellwig | 739bfb2 | 2007-08-29 10:58:01 +1000 | [diff] [blame] | 957 | xfs_inode_t *ip = XFS_I(inode); |
Christoph Hellwig | 051e7cd | 2007-08-28 13:58:24 +1000 | [diff] [blame] | 958 | size_t bufsize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 959 | |
Christoph Hellwig | 051e7cd | 2007-08-28 13:58:24 +1000 | [diff] [blame] | 960 | /* |
| 961 | * The Linux API doesn't pass down the total size of the buffer |
| 962 | * we read into down to the filesystem. With the filldir concept |
| 963 | * it's not needed for correct information, but the XFS dir2 leaf |
| 964 | * code wants an estimate of the buffer size to calculate it's |
| 965 | * readahead window and size the buffers used for mapping to |
| 966 | * physical blocks. |
| 967 | * |
| 968 | * Try to give it an estimate that's good enough, maybe at some |
| 969 | * point we can change the ->readdir prototype to include the |
Eric Sandeen | a9cc799 | 2010-02-03 17:50:13 +0000 | [diff] [blame] | 970 | * buffer size. For now we use the current glibc buffer size. |
Christoph Hellwig | 051e7cd | 2007-08-28 13:58:24 +1000 | [diff] [blame] | 971 | */ |
Eric Sandeen | a9cc799 | 2010-02-03 17:50:13 +0000 | [diff] [blame] | 972 | bufsize = (size_t)min_t(loff_t, 32768, ip->i_d.di_size); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 973 | |
Darrick J. Wong | acb9553 | 2017-06-16 11:00:14 -0700 | [diff] [blame] | 974 | return xfs_readdir(NULL, ip, ctx, bufsize); |
Jeff Liu | 3fe3e6b | 2012-05-10 21:29:17 +0800 | [diff] [blame] | 975 | } |
| 976 | |
| 977 | STATIC loff_t |
| 978 | xfs_file_llseek( |
| 979 | struct file *file, |
| 980 | loff_t offset, |
Eric Sandeen | 59f9c00 | 2014-09-09 11:57:10 +1000 | [diff] [blame] | 981 | int whence) |
Jeff Liu | 3fe3e6b | 2012-05-10 21:29:17 +0800 | [diff] [blame] | 982 | { |
Christoph Hellwig | 9b2970a | 2017-06-29 11:43:21 -0700 | [diff] [blame] | 983 | struct inode *inode = file->f_mapping->host; |
| 984 | |
| 985 | if (XFS_FORCED_SHUTDOWN(XFS_I(inode)->i_mount)) |
| 986 | return -EIO; |
| 987 | |
Eric Sandeen | 59f9c00 | 2014-09-09 11:57:10 +1000 | [diff] [blame] | 988 | switch (whence) { |
Christoph Hellwig | 9b2970a | 2017-06-29 11:43:21 -0700 | [diff] [blame] | 989 | default: |
Eric Sandeen | 59f9c00 | 2014-09-09 11:57:10 +1000 | [diff] [blame] | 990 | return generic_file_llseek(file, offset, whence); |
Jeff Liu | 3fe3e6b | 2012-05-10 21:29:17 +0800 | [diff] [blame] | 991 | case SEEK_HOLE: |
Christoph Hellwig | 9b2970a | 2017-06-29 11:43:21 -0700 | [diff] [blame] | 992 | offset = iomap_seek_hole(inode, offset, &xfs_iomap_ops); |
| 993 | break; |
Eric Sandeen | 49c6959 | 2014-09-09 11:56:48 +1000 | [diff] [blame] | 994 | case SEEK_DATA: |
Christoph Hellwig | 9b2970a | 2017-06-29 11:43:21 -0700 | [diff] [blame] | 995 | offset = iomap_seek_data(inode, offset, &xfs_iomap_ops); |
| 996 | break; |
Jeff Liu | 3fe3e6b | 2012-05-10 21:29:17 +0800 | [diff] [blame] | 997 | } |
Christoph Hellwig | 9b2970a | 2017-06-29 11:43:21 -0700 | [diff] [blame] | 998 | |
| 999 | if (offset < 0) |
| 1000 | return offset; |
| 1001 | return vfs_setpos(file, offset, inode->i_sb->s_maxbytes); |
Jeff Liu | 3fe3e6b | 2012-05-10 21:29:17 +0800 | [diff] [blame] | 1002 | } |
| 1003 | |
Dave Chinner | de0e8c2 | 2015-02-23 21:44:19 +1100 | [diff] [blame] | 1004 | /* |
| 1005 | * Locking for serialisation of IO during page faults. This results in a lock |
| 1006 | * ordering of: |
| 1007 | * |
| 1008 | * mmap_sem (MM) |
Dave Chinner | 6b698ed | 2015-06-04 09:18:53 +1000 | [diff] [blame] | 1009 | * sb_start_pagefault(vfs, freeze) |
Dave Chinner | 13ad4fe | 2015-11-03 12:37:02 +1100 | [diff] [blame] | 1010 | * i_mmaplock (XFS - truncate serialisation) |
Dave Chinner | 6b698ed | 2015-06-04 09:18:53 +1000 | [diff] [blame] | 1011 | * page_lock (MM) |
| 1012 | * i_lock (XFS - extent map serialisation) |
Dave Chinner | de0e8c2 | 2015-02-23 21:44:19 +1100 | [diff] [blame] | 1013 | */ |
Dave Chinner | de0e8c2 | 2015-02-23 21:44:19 +1100 | [diff] [blame] | 1014 | |
Dave Chinner | 075a924 | 2015-02-23 21:44:54 +1100 | [diff] [blame] | 1015 | /* |
| 1016 | * mmap()d file has taken write protection fault and is being made writable. We |
| 1017 | * can set the page state up correctly for a writable page, which means we can |
| 1018 | * do correct delalloc accounting (ENOSPC checking!) and unwritten extent |
| 1019 | * mapping. |
| 1020 | */ |
| 1021 | STATIC int |
| 1022 | xfs_filemap_page_mkwrite( |
Dave Chinner | 075a924 | 2015-02-23 21:44:54 +1100 | [diff] [blame] | 1023 | struct vm_fault *vmf) |
| 1024 | { |
Dave Jiang | 11bac80 | 2017-02-24 14:56:41 -0800 | [diff] [blame] | 1025 | struct inode *inode = file_inode(vmf->vma->vm_file); |
Dave Chinner | ec56b1f | 2015-06-04 09:18:18 +1000 | [diff] [blame] | 1026 | int ret; |
Dave Chinner | 075a924 | 2015-02-23 21:44:54 +1100 | [diff] [blame] | 1027 | |
Dave Chinner | 6b698ed | 2015-06-04 09:18:53 +1000 | [diff] [blame] | 1028 | trace_xfs_filemap_page_mkwrite(XFS_I(inode)); |
Dave Chinner | 075a924 | 2015-02-23 21:44:54 +1100 | [diff] [blame] | 1029 | |
Dave Chinner | 6b698ed | 2015-06-04 09:18:53 +1000 | [diff] [blame] | 1030 | sb_start_pagefault(inode->i_sb); |
Dave Jiang | 11bac80 | 2017-02-24 14:56:41 -0800 | [diff] [blame] | 1031 | file_update_time(vmf->vma->vm_file); |
Dave Chinner | 6b698ed | 2015-06-04 09:18:53 +1000 | [diff] [blame] | 1032 | xfs_ilock(XFS_I(inode), XFS_MMAPLOCK_SHARED); |
| 1033 | |
| 1034 | if (IS_DAX(inode)) { |
Dave Jiang | c791ace | 2017-02-24 14:57:08 -0800 | [diff] [blame] | 1035 | ret = dax_iomap_fault(vmf, PE_SIZE_PTE, &xfs_iomap_ops); |
Dave Chinner | 6b698ed | 2015-06-04 09:18:53 +1000 | [diff] [blame] | 1036 | } else { |
Dave Jiang | 11bac80 | 2017-02-24 14:56:41 -0800 | [diff] [blame] | 1037 | ret = iomap_page_mkwrite(vmf, &xfs_iomap_ops); |
Dave Chinner | 6b698ed | 2015-06-04 09:18:53 +1000 | [diff] [blame] | 1038 | ret = block_page_mkwrite_return(ret); |
| 1039 | } |
| 1040 | |
| 1041 | xfs_iunlock(XFS_I(inode), XFS_MMAPLOCK_SHARED); |
| 1042 | sb_end_pagefault(inode->i_sb); |
| 1043 | |
| 1044 | return ret; |
| 1045 | } |
| 1046 | |
| 1047 | STATIC int |
| 1048 | xfs_filemap_fault( |
Dave Chinner | 6b698ed | 2015-06-04 09:18:53 +1000 | [diff] [blame] | 1049 | struct vm_fault *vmf) |
| 1050 | { |
Dave Jiang | 11bac80 | 2017-02-24 14:56:41 -0800 | [diff] [blame] | 1051 | struct inode *inode = file_inode(vmf->vma->vm_file); |
Dave Chinner | 6b698ed | 2015-06-04 09:18:53 +1000 | [diff] [blame] | 1052 | int ret; |
| 1053 | |
Dave Chinner | b2442c5 | 2015-07-29 11:48:00 +1000 | [diff] [blame] | 1054 | trace_xfs_filemap_fault(XFS_I(inode)); |
Dave Chinner | 6b698ed | 2015-06-04 09:18:53 +1000 | [diff] [blame] | 1055 | |
| 1056 | /* DAX can shortcut the normal fault path on write faults! */ |
Dave Chinner | b2442c5 | 2015-07-29 11:48:00 +1000 | [diff] [blame] | 1057 | if ((vmf->flags & FAULT_FLAG_WRITE) && IS_DAX(inode)) |
Dave Jiang | 11bac80 | 2017-02-24 14:56:41 -0800 | [diff] [blame] | 1058 | return xfs_filemap_page_mkwrite(vmf); |
Dave Chinner | 075a924 | 2015-02-23 21:44:54 +1100 | [diff] [blame] | 1059 | |
Dave Chinner | b2442c5 | 2015-07-29 11:48:00 +1000 | [diff] [blame] | 1060 | xfs_ilock(XFS_I(inode), XFS_MMAPLOCK_SHARED); |
Christoph Hellwig | acdda3a | 2016-11-30 14:37:15 +1100 | [diff] [blame] | 1061 | if (IS_DAX(inode)) |
Dave Jiang | c791ace | 2017-02-24 14:57:08 -0800 | [diff] [blame] | 1062 | ret = dax_iomap_fault(vmf, PE_SIZE_PTE, &xfs_iomap_ops); |
Christoph Hellwig | acdda3a | 2016-11-30 14:37:15 +1100 | [diff] [blame] | 1063 | else |
Dave Jiang | 11bac80 | 2017-02-24 14:56:41 -0800 | [diff] [blame] | 1064 | ret = filemap_fault(vmf); |
Dave Chinner | b2442c5 | 2015-07-29 11:48:00 +1000 | [diff] [blame] | 1065 | xfs_iunlock(XFS_I(inode), XFS_MMAPLOCK_SHARED); |
Dave Chinner | 075a924 | 2015-02-23 21:44:54 +1100 | [diff] [blame] | 1066 | |
Dave Chinner | 6b698ed | 2015-06-04 09:18:53 +1000 | [diff] [blame] | 1067 | return ret; |
| 1068 | } |
| 1069 | |
Dave Chinner | 13ad4fe | 2015-11-03 12:37:02 +1100 | [diff] [blame] | 1070 | /* |
| 1071 | * Similar to xfs_filemap_fault(), the DAX fault path can call into here on |
| 1072 | * both read and write faults. Hence we need to handle both cases. There is no |
Dave Jiang | a2d58167 | 2017-02-24 14:56:59 -0800 | [diff] [blame] | 1073 | * ->huge_mkwrite callout for huge pages, so we have a single function here to |
Dave Chinner | 13ad4fe | 2015-11-03 12:37:02 +1100 | [diff] [blame] | 1074 | * handle both cases here. @flags carries the information on the type of fault |
| 1075 | * occuring. |
| 1076 | */ |
Matthew Wilcox | acd76e7 | 2015-09-08 14:59:06 -0700 | [diff] [blame] | 1077 | STATIC int |
Dave Jiang | a2d58167 | 2017-02-24 14:56:59 -0800 | [diff] [blame] | 1078 | xfs_filemap_huge_fault( |
Dave Jiang | c791ace | 2017-02-24 14:57:08 -0800 | [diff] [blame] | 1079 | struct vm_fault *vmf, |
| 1080 | enum page_entry_size pe_size) |
Matthew Wilcox | acd76e7 | 2015-09-08 14:59:06 -0700 | [diff] [blame] | 1081 | { |
Dave Jiang | f420039 | 2017-02-22 15:40:06 -0800 | [diff] [blame] | 1082 | struct inode *inode = file_inode(vmf->vma->vm_file); |
Matthew Wilcox | acd76e7 | 2015-09-08 14:59:06 -0700 | [diff] [blame] | 1083 | struct xfs_inode *ip = XFS_I(inode); |
| 1084 | int ret; |
| 1085 | |
| 1086 | if (!IS_DAX(inode)) |
| 1087 | return VM_FAULT_FALLBACK; |
| 1088 | |
Dave Jiang | a2d58167 | 2017-02-24 14:56:59 -0800 | [diff] [blame] | 1089 | trace_xfs_filemap_huge_fault(ip); |
Matthew Wilcox | acd76e7 | 2015-09-08 14:59:06 -0700 | [diff] [blame] | 1090 | |
Dave Jiang | d8a849e | 2017-02-22 15:40:03 -0800 | [diff] [blame] | 1091 | if (vmf->flags & FAULT_FLAG_WRITE) { |
Dave Chinner | 13ad4fe | 2015-11-03 12:37:02 +1100 | [diff] [blame] | 1092 | sb_start_pagefault(inode->i_sb); |
Dave Jiang | f420039 | 2017-02-22 15:40:06 -0800 | [diff] [blame] | 1093 | file_update_time(vmf->vma->vm_file); |
Dave Chinner | 13ad4fe | 2015-11-03 12:37:02 +1100 | [diff] [blame] | 1094 | } |
| 1095 | |
Matthew Wilcox | acd76e7 | 2015-09-08 14:59:06 -0700 | [diff] [blame] | 1096 | xfs_ilock(XFS_I(inode), XFS_MMAPLOCK_SHARED); |
Dave Jiang | c791ace | 2017-02-24 14:57:08 -0800 | [diff] [blame] | 1097 | ret = dax_iomap_fault(vmf, pe_size, &xfs_iomap_ops); |
Matthew Wilcox | acd76e7 | 2015-09-08 14:59:06 -0700 | [diff] [blame] | 1098 | xfs_iunlock(XFS_I(inode), XFS_MMAPLOCK_SHARED); |
Dave Chinner | 13ad4fe | 2015-11-03 12:37:02 +1100 | [diff] [blame] | 1099 | |
Dave Jiang | d8a849e | 2017-02-22 15:40:03 -0800 | [diff] [blame] | 1100 | if (vmf->flags & FAULT_FLAG_WRITE) |
Dave Chinner | 13ad4fe | 2015-11-03 12:37:02 +1100 | [diff] [blame] | 1101 | sb_end_pagefault(inode->i_sb); |
Matthew Wilcox | acd76e7 | 2015-09-08 14:59:06 -0700 | [diff] [blame] | 1102 | |
| 1103 | return ret; |
| 1104 | } |
| 1105 | |
Dave Chinner | 3af4928 | 2015-11-03 12:37:02 +1100 | [diff] [blame] | 1106 | /* |
| 1107 | * pfn_mkwrite was originally inteneded to ensure we capture time stamp |
| 1108 | * updates on write faults. In reality, it's need to serialise against |
Ross Zwisler | 5eb88dc | 2016-01-22 15:10:56 -0800 | [diff] [blame] | 1109 | * truncate similar to page_mkwrite. Hence we cycle the XFS_MMAPLOCK_SHARED |
| 1110 | * to ensure we serialise the fault barrier in place. |
Dave Chinner | 3af4928 | 2015-11-03 12:37:02 +1100 | [diff] [blame] | 1111 | */ |
| 1112 | static int |
| 1113 | xfs_filemap_pfn_mkwrite( |
Dave Chinner | 3af4928 | 2015-11-03 12:37:02 +1100 | [diff] [blame] | 1114 | struct vm_fault *vmf) |
| 1115 | { |
| 1116 | |
Dave Jiang | 11bac80 | 2017-02-24 14:56:41 -0800 | [diff] [blame] | 1117 | struct inode *inode = file_inode(vmf->vma->vm_file); |
Dave Chinner | 3af4928 | 2015-11-03 12:37:02 +1100 | [diff] [blame] | 1118 | struct xfs_inode *ip = XFS_I(inode); |
| 1119 | int ret = VM_FAULT_NOPAGE; |
| 1120 | loff_t size; |
| 1121 | |
| 1122 | trace_xfs_filemap_pfn_mkwrite(ip); |
| 1123 | |
| 1124 | sb_start_pagefault(inode->i_sb); |
Dave Jiang | 11bac80 | 2017-02-24 14:56:41 -0800 | [diff] [blame] | 1125 | file_update_time(vmf->vma->vm_file); |
Dave Chinner | 3af4928 | 2015-11-03 12:37:02 +1100 | [diff] [blame] | 1126 | |
| 1127 | /* check if the faulting page hasn't raced with truncate */ |
| 1128 | xfs_ilock(ip, XFS_MMAPLOCK_SHARED); |
| 1129 | size = (i_size_read(inode) + PAGE_SIZE - 1) >> PAGE_SHIFT; |
| 1130 | if (vmf->pgoff >= size) |
| 1131 | ret = VM_FAULT_SIGBUS; |
Ross Zwisler | 5eb88dc | 2016-01-22 15:10:56 -0800 | [diff] [blame] | 1132 | else if (IS_DAX(inode)) |
Dave Jiang | 11bac80 | 2017-02-24 14:56:41 -0800 | [diff] [blame] | 1133 | ret = dax_pfn_mkwrite(vmf); |
Dave Chinner | 3af4928 | 2015-11-03 12:37:02 +1100 | [diff] [blame] | 1134 | xfs_iunlock(ip, XFS_MMAPLOCK_SHARED); |
| 1135 | sb_end_pagefault(inode->i_sb); |
| 1136 | return ret; |
| 1137 | |
| 1138 | } |
| 1139 | |
Dave Chinner | 6b698ed | 2015-06-04 09:18:53 +1000 | [diff] [blame] | 1140 | static const struct vm_operations_struct xfs_file_vm_ops = { |
| 1141 | .fault = xfs_filemap_fault, |
Dave Jiang | a2d58167 | 2017-02-24 14:56:59 -0800 | [diff] [blame] | 1142 | .huge_fault = xfs_filemap_huge_fault, |
Dave Chinner | 6b698ed | 2015-06-04 09:18:53 +1000 | [diff] [blame] | 1143 | .map_pages = filemap_map_pages, |
| 1144 | .page_mkwrite = xfs_filemap_page_mkwrite, |
Dave Chinner | 3af4928 | 2015-11-03 12:37:02 +1100 | [diff] [blame] | 1145 | .pfn_mkwrite = xfs_filemap_pfn_mkwrite, |
Dave Chinner | 6b698ed | 2015-06-04 09:18:53 +1000 | [diff] [blame] | 1146 | }; |
| 1147 | |
| 1148 | STATIC int |
| 1149 | xfs_file_mmap( |
| 1150 | struct file *filp, |
| 1151 | struct vm_area_struct *vma) |
| 1152 | { |
| 1153 | file_accessed(filp); |
| 1154 | vma->vm_ops = &xfs_file_vm_ops; |
| 1155 | if (IS_DAX(file_inode(filp))) |
Matthew Wilcox | acd76e7 | 2015-09-08 14:59:06 -0700 | [diff] [blame] | 1156 | vma->vm_flags |= VM_MIXEDMAP | VM_HUGEPAGE; |
Dave Chinner | 6b698ed | 2015-06-04 09:18:53 +1000 | [diff] [blame] | 1157 | return 0; |
Dave Chinner | 075a924 | 2015-02-23 21:44:54 +1100 | [diff] [blame] | 1158 | } |
| 1159 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 1160 | const struct file_operations xfs_file_operations = { |
Jeff Liu | 3fe3e6b | 2012-05-10 21:29:17 +0800 | [diff] [blame] | 1161 | .llseek = xfs_file_llseek, |
Al Viro | b4f5d2c | 2014-04-02 14:37:59 -0400 | [diff] [blame] | 1162 | .read_iter = xfs_file_read_iter, |
Al Viro | bf97f3bc | 2014-04-03 14:20:23 -0400 | [diff] [blame] | 1163 | .write_iter = xfs_file_write_iter, |
Al Viro | 82c156f | 2016-09-22 23:35:42 -0400 | [diff] [blame] | 1164 | .splice_read = generic_file_splice_read, |
Al Viro | 8d02076 | 2014-04-05 04:27:08 -0400 | [diff] [blame] | 1165 | .splice_write = iter_file_splice_write, |
Nathan Scott | 3562fd4 | 2006-03-14 14:00:35 +1100 | [diff] [blame] | 1166 | .unlocked_ioctl = xfs_file_ioctl, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1167 | #ifdef CONFIG_COMPAT |
Nathan Scott | 3562fd4 | 2006-03-14 14:00:35 +1100 | [diff] [blame] | 1168 | .compat_ioctl = xfs_file_compat_ioctl, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1169 | #endif |
Nathan Scott | 3562fd4 | 2006-03-14 14:00:35 +1100 | [diff] [blame] | 1170 | .mmap = xfs_file_mmap, |
| 1171 | .open = xfs_file_open, |
| 1172 | .release = xfs_file_release, |
| 1173 | .fsync = xfs_file_fsync, |
Toshi Kani | dbe6ec8 | 2016-10-07 16:59:59 -0700 | [diff] [blame] | 1174 | .get_unmapped_area = thp_get_unmapped_area, |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 1175 | .fallocate = xfs_file_fallocate, |
Darrick J. Wong | 9fe2604 | 2016-10-03 09:11:40 -0700 | [diff] [blame] | 1176 | .clone_file_range = xfs_file_clone_range, |
Darrick J. Wong | cc71466 | 2016-10-03 09:11:41 -0700 | [diff] [blame] | 1177 | .dedupe_file_range = xfs_file_dedupe_range, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1178 | }; |
| 1179 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 1180 | const struct file_operations xfs_dir_file_operations = { |
Christoph Hellwig | f999a5b | 2008-11-28 14:23:32 +1100 | [diff] [blame] | 1181 | .open = xfs_dir_open, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1182 | .read = generic_read_dir, |
Al Viro | 3b0a3c1 | 2016-04-20 23:42:46 -0400 | [diff] [blame] | 1183 | .iterate_shared = xfs_file_readdir, |
Al Viro | 59af158 | 2008-08-24 07:24:41 -0400 | [diff] [blame] | 1184 | .llseek = generic_file_llseek, |
Nathan Scott | 3562fd4 | 2006-03-14 14:00:35 +1100 | [diff] [blame] | 1185 | .unlocked_ioctl = xfs_file_ioctl, |
Nathan Scott | d387039 | 2005-05-06 06:44:46 -0700 | [diff] [blame] | 1186 | #ifdef CONFIG_COMPAT |
Nathan Scott | 3562fd4 | 2006-03-14 14:00:35 +1100 | [diff] [blame] | 1187 | .compat_ioctl = xfs_file_compat_ioctl, |
Nathan Scott | d387039 | 2005-05-06 06:44:46 -0700 | [diff] [blame] | 1188 | #endif |
Christoph Hellwig | 1da2f2d | 2011-10-02 14:25:16 +0000 | [diff] [blame] | 1189 | .fsync = xfs_dir_fsync, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1190 | }; |