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 | f0f37e2 | 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 | |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 143 | error = filemap_write_and_wait_range(inode->i_mapping, start, end); |
| 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 | 6c31f49 | 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 | |
Christoph Hellwig | 6552321 | 2016-11-30 14:33:25 +1100 | [diff] [blame] | 240 | xfs_ilock(ip, XFS_IOLOCK_SHARED); |
Ross Zwisler | 11c59c9 | 2016-11-08 11:32:46 +1100 | [diff] [blame] | 241 | ret = dax_iomap_rw(iocb, to, &xfs_iomap_ops); |
Christoph Hellwig | 6552321 | 2016-11-30 14:33:25 +1100 | [diff] [blame] | 242 | xfs_iunlock(ip, XFS_IOLOCK_SHARED); |
Christoph Hellwig | bbc5a74 | 2016-07-20 11:35:42 +1000 | [diff] [blame] | 243 | |
Christoph Hellwig | f1285ff | 2016-07-20 11:36:57 +1000 | [diff] [blame] | 244 | file_accessed(iocb->ki_filp); |
Christoph Hellwig | bbc5a74 | 2016-07-20 11:35:42 +1000 | [diff] [blame] | 245 | return ret; |
| 246 | } |
| 247 | |
| 248 | STATIC ssize_t |
| 249 | xfs_file_buffered_aio_read( |
| 250 | struct kiocb *iocb, |
| 251 | struct iov_iter *to) |
| 252 | { |
| 253 | struct xfs_inode *ip = XFS_I(file_inode(iocb->ki_filp)); |
| 254 | ssize_t ret; |
| 255 | |
| 256 | trace_xfs_file_buffered_read(ip, iov_iter_count(to), iocb->ki_pos); |
| 257 | |
Christoph Hellwig | 6552321 | 2016-11-30 14:33:25 +1100 | [diff] [blame] | 258 | xfs_ilock(ip, XFS_IOLOCK_SHARED); |
Al Viro | b4f5d2c | 2014-04-02 14:37:59 -0400 | [diff] [blame] | 259 | ret = generic_file_read_iter(iocb, to); |
Christoph Hellwig | 6552321 | 2016-11-30 14:33:25 +1100 | [diff] [blame] | 260 | xfs_iunlock(ip, XFS_IOLOCK_SHARED); |
Christoph Hellwig | bbc5a74 | 2016-07-20 11:35:42 +1000 | [diff] [blame] | 261 | |
| 262 | return ret; |
| 263 | } |
| 264 | |
| 265 | STATIC ssize_t |
| 266 | xfs_file_read_iter( |
| 267 | struct kiocb *iocb, |
| 268 | struct iov_iter *to) |
| 269 | { |
Christoph Hellwig | 16d4d43 | 2016-07-20 11:38:55 +1000 | [diff] [blame] | 270 | struct inode *inode = file_inode(iocb->ki_filp); |
| 271 | struct xfs_mount *mp = XFS_I(inode)->i_mount; |
Christoph Hellwig | bbc5a74 | 2016-07-20 11:35:42 +1000 | [diff] [blame] | 272 | ssize_t ret = 0; |
| 273 | |
| 274 | XFS_STATS_INC(mp, xs_read_calls); |
| 275 | |
| 276 | if (XFS_FORCED_SHUTDOWN(mp)) |
| 277 | return -EIO; |
| 278 | |
Christoph Hellwig | 16d4d43 | 2016-07-20 11:38:55 +1000 | [diff] [blame] | 279 | if (IS_DAX(inode)) |
| 280 | ret = xfs_file_dax_read(iocb, to); |
| 281 | else if (iocb->ki_flags & IOCB_DIRECT) |
Christoph Hellwig | bbc5a74 | 2016-07-20 11:35:42 +1000 | [diff] [blame] | 282 | ret = xfs_file_dio_aio_read(iocb, to); |
| 283 | else |
| 284 | ret = xfs_file_buffered_aio_read(iocb, to); |
| 285 | |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 286 | if (ret > 0) |
Bill O'Donnell | ff6d6af | 2015-10-12 18:21:22 +1100 | [diff] [blame] | 287 | XFS_STATS_ADD(mp, xs_read_bytes, ret); |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 288 | return ret; |
| 289 | } |
| 290 | |
Dave Chinner | 4c5cfd1 | 2011-01-11 10:14:16 +1100 | [diff] [blame] | 291 | /* |
Christoph Hellwig | 193aec1 | 2012-03-27 10:34:49 -0400 | [diff] [blame] | 292 | * Zero any on disk space between the current EOF and the new, larger EOF. |
| 293 | * |
| 294 | * This handles the normal case of zeroing the remainder of the last block in |
| 295 | * the file and the unusual case of zeroing blocks out beyond the size of the |
| 296 | * file. This second case only happens with fixed size extents and when the |
| 297 | * system crashes before the inode size was updated but after blocks were |
| 298 | * allocated. |
| 299 | * |
| 300 | * 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] | 301 | */ |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 302 | int /* error (positive) */ |
| 303 | xfs_zero_eof( |
Christoph Hellwig | 193aec1 | 2012-03-27 10:34:49 -0400 | [diff] [blame] | 304 | struct xfs_inode *ip, |
| 305 | xfs_off_t offset, /* starting I/O offset */ |
Dave Chinner | 5885ebd | 2015-02-23 22:37:08 +1100 | [diff] [blame] | 306 | xfs_fsize_t isize, /* current inode size */ |
| 307 | bool *did_zeroing) |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 308 | { |
Christoph Hellwig | 193aec1 | 2012-03-27 10:34:49 -0400 | [diff] [blame] | 309 | ASSERT(xfs_isilocked(ip, XFS_IOLOCK_EXCL)); |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 310 | ASSERT(offset > isize); |
| 311 | |
Brian Foster | 0a50f16 | 2015-10-12 16:02:08 +1100 | [diff] [blame] | 312 | trace_xfs_zero_eof(ip, isize, offset - isize); |
Christoph Hellwig | 570b621 | 2016-06-21 09:57:26 +1000 | [diff] [blame] | 313 | return xfs_zero_range(ip, isize, offset - isize, did_zeroing); |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 314 | } |
| 315 | |
Dave Chinner | f0d26e8 | 2011-01-11 10:15:36 +1100 | [diff] [blame] | 316 | /* |
Dave Chinner | 4d8d158 | 2011-01-11 10:23:42 +1100 | [diff] [blame] | 317 | * Common pre-write limit and setup checks. |
| 318 | * |
Christoph Hellwig | 5bf1f26 | 2011-12-18 20:00:13 +0000 | [diff] [blame] | 319 | * Called with the iolocked held either shared and exclusive according to |
| 320 | * @iolock, and returns with it held. Might upgrade the iolock to exclusive |
| 321 | * if called for a direct write beyond i_size. |
Dave Chinner | 4d8d158 | 2011-01-11 10:23:42 +1100 | [diff] [blame] | 322 | */ |
| 323 | STATIC ssize_t |
| 324 | xfs_file_aio_write_checks( |
Al Viro | 99733fa | 2015-04-07 14:25:18 -0400 | [diff] [blame] | 325 | struct kiocb *iocb, |
| 326 | struct iov_iter *from, |
Dave Chinner | 4d8d158 | 2011-01-11 10:23:42 +1100 | [diff] [blame] | 327 | int *iolock) |
| 328 | { |
Al Viro | 99733fa | 2015-04-07 14:25:18 -0400 | [diff] [blame] | 329 | struct file *file = iocb->ki_filp; |
Dave Chinner | 4d8d158 | 2011-01-11 10:23:42 +1100 | [diff] [blame] | 330 | struct inode *inode = file->f_mapping->host; |
| 331 | struct xfs_inode *ip = XFS_I(inode); |
Al Viro | 3309dd0 | 2015-04-09 12:55:47 -0400 | [diff] [blame] | 332 | ssize_t error = 0; |
Al Viro | 99733fa | 2015-04-07 14:25:18 -0400 | [diff] [blame] | 333 | size_t count = iov_iter_count(from); |
Brian Foster | 3136e8b | 2015-10-12 16:02:05 +1100 | [diff] [blame] | 334 | bool drained_dio = false; |
Dave Chinner | 4d8d158 | 2011-01-11 10:23:42 +1100 | [diff] [blame] | 335 | |
Dave Chinner | 7271d24 | 2011-08-25 07:17:02 +0000 | [diff] [blame] | 336 | restart: |
Al Viro | 3309dd0 | 2015-04-09 12:55:47 -0400 | [diff] [blame] | 337 | error = generic_write_checks(iocb, from); |
| 338 | if (error <= 0) |
Dave Chinner | 4d8d158 | 2011-01-11 10:23:42 +1100 | [diff] [blame] | 339 | return error; |
Dave Chinner | 4d8d158 | 2011-01-11 10:23:42 +1100 | [diff] [blame] | 340 | |
Christoph Hellwig | 6552321 | 2016-11-30 14:33:25 +1100 | [diff] [blame] | 341 | error = xfs_break_layouts(inode, iolock); |
Christoph Hellwig | 781355c | 2015-02-16 11:59:50 +1100 | [diff] [blame] | 342 | if (error) |
| 343 | return error; |
| 344 | |
Christoph Hellwig | 6552321 | 2016-11-30 14:33:25 +1100 | [diff] [blame] | 345 | /* |
| 346 | * For changing security info in file_remove_privs() we need i_rwsem |
| 347 | * exclusively. |
| 348 | */ |
Jan Kara | a6de82c | 2015-05-21 16:05:56 +0200 | [diff] [blame] | 349 | if (*iolock == XFS_IOLOCK_SHARED && !IS_NOSEC(inode)) { |
Christoph Hellwig | 6552321 | 2016-11-30 14:33:25 +1100 | [diff] [blame] | 350 | xfs_iunlock(ip, *iolock); |
Jan Kara | a6de82c | 2015-05-21 16:05:56 +0200 | [diff] [blame] | 351 | *iolock = XFS_IOLOCK_EXCL; |
Christoph Hellwig | 6552321 | 2016-11-30 14:33:25 +1100 | [diff] [blame] | 352 | xfs_ilock(ip, *iolock); |
Jan Kara | a6de82c | 2015-05-21 16:05:56 +0200 | [diff] [blame] | 353 | goto restart; |
| 354 | } |
Dave Chinner | 4d8d158 | 2011-01-11 10:23:42 +1100 | [diff] [blame] | 355 | /* |
| 356 | * If the offset is beyond the size of the file, we need to zero any |
| 357 | * blocks that fall between the existing EOF and the start of this |
Christoph Hellwig | 2813d68 | 2011-12-18 20:00:12 +0000 | [diff] [blame] | 358 | * write. If zeroing is needed and we are currently holding the |
Christoph Hellwig | 467f789 | 2012-03-27 10:34:47 -0400 | [diff] [blame] | 359 | * iolock shared, we need to update it to exclusive which implies |
| 360 | * having to redo all checks before. |
Dave Chinner | b9d5984 | 2015-04-16 22:03:07 +1000 | [diff] [blame] | 361 | * |
| 362 | * We need to serialise against EOF updates that occur in IO |
| 363 | * completions here. We want to make sure that nobody is changing the |
| 364 | * size while we do this check until we have placed an IO barrier (i.e. |
| 365 | * hold the XFS_IOLOCK_EXCL) that prevents new IO from being dispatched. |
| 366 | * The spinlock effectively forms a memory barrier once we have the |
| 367 | * XFS_IOLOCK_EXCL so we are guaranteed to see the latest EOF value |
| 368 | * 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] | 369 | */ |
Dave Chinner | b9d5984 | 2015-04-16 22:03:07 +1000 | [diff] [blame] | 370 | spin_lock(&ip->i_flags_lock); |
Al Viro | 99733fa | 2015-04-07 14:25:18 -0400 | [diff] [blame] | 371 | if (iocb->ki_pos > i_size_read(inode)) { |
Dave Chinner | 5885ebd | 2015-02-23 22:37:08 +1100 | [diff] [blame] | 372 | bool zero = false; |
| 373 | |
Dave Chinner | b9d5984 | 2015-04-16 22:03:07 +1000 | [diff] [blame] | 374 | spin_unlock(&ip->i_flags_lock); |
Brian Foster | 3136e8b | 2015-10-12 16:02:05 +1100 | [diff] [blame] | 375 | if (!drained_dio) { |
| 376 | if (*iolock == XFS_IOLOCK_SHARED) { |
Christoph Hellwig | 6552321 | 2016-11-30 14:33:25 +1100 | [diff] [blame] | 377 | xfs_iunlock(ip, *iolock); |
Brian Foster | 3136e8b | 2015-10-12 16:02:05 +1100 | [diff] [blame] | 378 | *iolock = XFS_IOLOCK_EXCL; |
Christoph Hellwig | 6552321 | 2016-11-30 14:33:25 +1100 | [diff] [blame] | 379 | xfs_ilock(ip, *iolock); |
Brian Foster | 3136e8b | 2015-10-12 16:02:05 +1100 | [diff] [blame] | 380 | iov_iter_reexpand(from, count); |
| 381 | } |
Dave Chinner | 40c63fb | 2015-04-16 22:03:17 +1000 | [diff] [blame] | 382 | /* |
| 383 | * We now have an IO submission barrier in place, but |
| 384 | * AIO can do EOF updates during IO completion and hence |
| 385 | * we now need to wait for all of them to drain. Non-AIO |
| 386 | * DIO will have drained before we are given the |
| 387 | * XFS_IOLOCK_EXCL, and so for most cases this wait is a |
| 388 | * no-op. |
| 389 | */ |
| 390 | inode_dio_wait(inode); |
Brian Foster | 3136e8b | 2015-10-12 16:02:05 +1100 | [diff] [blame] | 391 | drained_dio = true; |
Dave Chinner | 7271d24 | 2011-08-25 07:17:02 +0000 | [diff] [blame] | 392 | goto restart; |
| 393 | } |
Al Viro | 99733fa | 2015-04-07 14:25:18 -0400 | [diff] [blame] | 394 | 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] | 395 | if (error) |
| 396 | return error; |
Dave Chinner | b9d5984 | 2015-04-16 22:03:07 +1000 | [diff] [blame] | 397 | } else |
| 398 | spin_unlock(&ip->i_flags_lock); |
Dave Chinner | 4d8d158 | 2011-01-11 10:23:42 +1100 | [diff] [blame] | 399 | |
| 400 | /* |
Christoph Hellwig | 8a9c998 | 2012-02-29 09:53:52 +0000 | [diff] [blame] | 401 | * Updating the timestamps will grab the ilock again from |
| 402 | * xfs_fs_dirty_inode, so we have to call it after dropping the |
| 403 | * lock above. Eventually we should look into a way to avoid |
| 404 | * the pointless lock roundtrip. |
| 405 | */ |
Josef Bacik | c3b2da3 | 2012-03-26 09:59:21 -0400 | [diff] [blame] | 406 | if (likely(!(file->f_mode & FMODE_NOCMTIME))) { |
| 407 | error = file_update_time(file); |
| 408 | if (error) |
| 409 | return error; |
| 410 | } |
Christoph Hellwig | 8a9c998 | 2012-02-29 09:53:52 +0000 | [diff] [blame] | 411 | |
| 412 | /* |
Dave Chinner | 4d8d158 | 2011-01-11 10:23:42 +1100 | [diff] [blame] | 413 | * If we're writing the file then make sure to clear the setuid and |
| 414 | * setgid bits if the process is not being run by root. This keeps |
| 415 | * people from modifying setuid and setgid binaries. |
| 416 | */ |
Jan Kara | a6de82c | 2015-05-21 16:05:56 +0200 | [diff] [blame] | 417 | if (!IS_NOSEC(inode)) |
| 418 | return file_remove_privs(file); |
| 419 | return 0; |
Dave Chinner | 4d8d158 | 2011-01-11 10:23:42 +1100 | [diff] [blame] | 420 | } |
| 421 | |
Christoph Hellwig | acdda3a | 2016-11-30 14:37:15 +1100 | [diff] [blame] | 422 | static int |
| 423 | xfs_dio_write_end_io( |
| 424 | struct kiocb *iocb, |
| 425 | ssize_t size, |
| 426 | unsigned flags) |
| 427 | { |
| 428 | struct inode *inode = file_inode(iocb->ki_filp); |
| 429 | struct xfs_inode *ip = XFS_I(inode); |
| 430 | loff_t offset = iocb->ki_pos; |
| 431 | bool update_size = false; |
| 432 | int error = 0; |
| 433 | |
| 434 | trace_xfs_end_io_direct_write(ip, offset, size); |
| 435 | |
| 436 | if (XFS_FORCED_SHUTDOWN(ip->i_mount)) |
| 437 | return -EIO; |
| 438 | |
| 439 | if (size <= 0) |
| 440 | return size; |
| 441 | |
| 442 | /* |
| 443 | * We need to update the in-core inode size here so that we don't end up |
| 444 | * with the on-disk inode size being outside the in-core inode size. We |
| 445 | * have no other method of updating EOF for AIO, so always do it here |
| 446 | * if necessary. |
| 447 | * |
| 448 | * We need to lock the test/set EOF update as we can be racing with |
| 449 | * other IO completions here to update the EOF. Failing to serialise |
| 450 | * here can result in EOF moving backwards and Bad Things Happen when |
| 451 | * that occurs. |
| 452 | */ |
| 453 | spin_lock(&ip->i_flags_lock); |
| 454 | if (offset + size > i_size_read(inode)) { |
| 455 | i_size_write(inode, offset + size); |
| 456 | update_size = true; |
| 457 | } |
| 458 | spin_unlock(&ip->i_flags_lock); |
| 459 | |
| 460 | if (flags & IOMAP_DIO_COW) { |
| 461 | error = xfs_reflink_end_cow(ip, offset, size); |
| 462 | if (error) |
| 463 | return error; |
| 464 | } |
| 465 | |
| 466 | if (flags & IOMAP_DIO_UNWRITTEN) |
| 467 | error = xfs_iomap_write_unwritten(ip, offset, size); |
| 468 | else if (update_size) |
| 469 | error = xfs_setfilesize(ip, offset, size); |
| 470 | |
| 471 | return error; |
| 472 | } |
| 473 | |
Dave Chinner | 4d8d158 | 2011-01-11 10:23:42 +1100 | [diff] [blame] | 474 | /* |
Dave Chinner | f0d26e8 | 2011-01-11 10:15:36 +1100 | [diff] [blame] | 475 | * xfs_file_dio_aio_write - handle direct IO writes |
| 476 | * |
| 477 | * 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] | 478 | * 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] | 479 | * follow locking changes and looping. |
| 480 | * |
Dave Chinner | eda7798 | 2011-01-11 10:22:40 +1100 | [diff] [blame] | 481 | * If there are cached pages or we're extending the file, we need IOLOCK_EXCL |
| 482 | * until we're sure the bytes at the new EOF have been zeroed and/or the cached |
| 483 | * pages are flushed out. |
| 484 | * |
| 485 | * In most cases the direct IO writes will be done holding IOLOCK_SHARED |
| 486 | * allowing them to be done in parallel with reads and other direct IO writes. |
| 487 | * However, if the IO is not aligned to filesystem blocks, the direct IO layer |
| 488 | * needs to do sub-block zeroing and that requires serialisation against other |
| 489 | * direct IOs to the same block. In this case we need to serialise the |
| 490 | * submission of the unaligned IOs so that we don't get racing block zeroing in |
| 491 | * the dio layer. To avoid the problem with aio, we also need to wait for |
| 492 | * outstanding IOs to complete so that unwritten extent conversion is completed |
| 493 | * 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] | 494 | * hitting it with a big hammer (i.e. inode_dio_wait()). |
Dave Chinner | eda7798 | 2011-01-11 10:22:40 +1100 | [diff] [blame] | 495 | * |
Dave Chinner | f0d26e8 | 2011-01-11 10:15:36 +1100 | [diff] [blame] | 496 | * Returns with locks held indicated by @iolock and errors indicated by |
| 497 | * negative return values. |
| 498 | */ |
| 499 | STATIC ssize_t |
| 500 | xfs_file_dio_aio_write( |
| 501 | struct kiocb *iocb, |
Al Viro | b318891 | 2014-04-02 07:06:30 -0400 | [diff] [blame] | 502 | struct iov_iter *from) |
Dave Chinner | f0d26e8 | 2011-01-11 10:15:36 +1100 | [diff] [blame] | 503 | { |
| 504 | struct file *file = iocb->ki_filp; |
| 505 | struct address_space *mapping = file->f_mapping; |
| 506 | struct inode *inode = mapping->host; |
| 507 | struct xfs_inode *ip = XFS_I(inode); |
| 508 | struct xfs_mount *mp = ip->i_mount; |
| 509 | ssize_t ret = 0; |
Dave Chinner | eda7798 | 2011-01-11 10:22:40 +1100 | [diff] [blame] | 510 | int unaligned_io = 0; |
Christoph Hellwig | d060646 | 2011-12-18 20:00:14 +0000 | [diff] [blame] | 511 | int iolock; |
Al Viro | b318891 | 2014-04-02 07:06:30 -0400 | [diff] [blame] | 512 | size_t count = iov_iter_count(from); |
Christoph Hellwig | acdda3a | 2016-11-30 14:37:15 +1100 | [diff] [blame] | 513 | struct xfs_buftarg *target = XFS_IS_REALTIME_INODE(ip) ? |
Dave Chinner | f0d26e8 | 2011-01-11 10:15:36 +1100 | [diff] [blame] | 514 | mp->m_rtdev_targp : mp->m_ddev_targp; |
| 515 | |
Eric Sandeen | 7c71ee7 | 2014-01-21 16:46:23 -0600 | [diff] [blame] | 516 | /* DIO must be aligned to device logical sector size */ |
Christoph Hellwig | 16d4d43 | 2016-07-20 11:38:55 +1000 | [diff] [blame] | 517 | if ((iocb->ki_pos | count) & target->bt_logical_sectormask) |
Eric Sandeen | b474c7a | 2014-06-22 15:04:54 +1000 | [diff] [blame] | 518 | return -EINVAL; |
Dave Chinner | f0d26e8 | 2011-01-11 10:15:36 +1100 | [diff] [blame] | 519 | |
Christoph Hellwig | 0ee7a3f | 2016-10-20 15:44:14 +1100 | [diff] [blame] | 520 | /* |
| 521 | * Don't take the exclusive iolock here unless the I/O is unaligned to |
| 522 | * the file system block size. We don't need to consider the EOF |
| 523 | * extension case here because xfs_file_aio_write_checks() will relock |
| 524 | * the inode as necessary for EOF zeroing cases and fill out the new |
| 525 | * inode size as appropriate. |
| 526 | */ |
Christoph Hellwig | 1371271 | 2016-04-07 08:51:57 -0700 | [diff] [blame] | 527 | if ((iocb->ki_pos & mp->m_blockmask) || |
Christoph Hellwig | 0ee7a3f | 2016-10-20 15:44:14 +1100 | [diff] [blame] | 528 | ((iocb->ki_pos + count) & mp->m_blockmask)) { |
Dave Chinner | eda7798 | 2011-01-11 10:22:40 +1100 | [diff] [blame] | 529 | unaligned_io = 1; |
Christoph Hellwig | 54a4ef8 | 2017-02-06 13:00:54 -0800 | [diff] [blame] | 530 | |
| 531 | /* |
| 532 | * We can't properly handle unaligned direct I/O to reflink |
| 533 | * files yet, as we can't unshare a partial block. |
| 534 | */ |
| 535 | if (xfs_is_reflink_inode(ip)) { |
| 536 | trace_xfs_reflink_bounce_dio_write(ip, iocb->ki_pos, count); |
| 537 | return -EREMCHG; |
| 538 | } |
Christoph Hellwig | d060646 | 2011-12-18 20:00:14 +0000 | [diff] [blame] | 539 | iolock = XFS_IOLOCK_EXCL; |
Christoph Hellwig | 0ee7a3f | 2016-10-20 15:44:14 +1100 | [diff] [blame] | 540 | } else { |
Christoph Hellwig | d060646 | 2011-12-18 20:00:14 +0000 | [diff] [blame] | 541 | iolock = XFS_IOLOCK_SHARED; |
Christoph Hellwig | c58cb16 | 2011-08-27 14:42:53 +0000 | [diff] [blame] | 542 | } |
Dave Chinner | f0d26e8 | 2011-01-11 10:15:36 +1100 | [diff] [blame] | 543 | |
Christoph Hellwig | 6552321 | 2016-11-30 14:33:25 +1100 | [diff] [blame] | 544 | xfs_ilock(ip, iolock); |
Christoph Hellwig | 0ee7a3f | 2016-10-20 15:44:14 +1100 | [diff] [blame] | 545 | |
Al Viro | 99733fa | 2015-04-07 14:25:18 -0400 | [diff] [blame] | 546 | ret = xfs_file_aio_write_checks(iocb, from, &iolock); |
Dave Chinner | 4d8d158 | 2011-01-11 10:23:42 +1100 | [diff] [blame] | 547 | if (ret) |
Christoph Hellwig | d060646 | 2011-12-18 20:00:14 +0000 | [diff] [blame] | 548 | goto out; |
Al Viro | 99733fa | 2015-04-07 14:25:18 -0400 | [diff] [blame] | 549 | count = iov_iter_count(from); |
Dave Chinner | f0d26e8 | 2011-01-11 10:15:36 +1100 | [diff] [blame] | 550 | |
Dave Chinner | eda7798 | 2011-01-11 10:22:40 +1100 | [diff] [blame] | 551 | /* |
| 552 | * 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] | 553 | * otherwise demote the lock if we had to take the exclusive lock |
| 554 | * for other reasons in xfs_file_aio_write_checks. |
Dave Chinner | eda7798 | 2011-01-11 10:22:40 +1100 | [diff] [blame] | 555 | */ |
| 556 | if (unaligned_io) |
Christoph Hellwig | 4a06fd2 | 2011-08-23 08:28:13 +0000 | [diff] [blame] | 557 | inode_dio_wait(inode); |
Christoph Hellwig | d060646 | 2011-12-18 20:00:14 +0000 | [diff] [blame] | 558 | else if (iolock == XFS_IOLOCK_EXCL) { |
Christoph Hellwig | 6552321 | 2016-11-30 14:33:25 +1100 | [diff] [blame] | 559 | xfs_ilock_demote(ip, XFS_IOLOCK_EXCL); |
Christoph Hellwig | d060646 | 2011-12-18 20:00:14 +0000 | [diff] [blame] | 560 | iolock = XFS_IOLOCK_SHARED; |
Dave Chinner | f0d26e8 | 2011-01-11 10:15:36 +1100 | [diff] [blame] | 561 | } |
| 562 | |
Christoph Hellwig | 3176c3e | 2016-07-20 11:31:42 +1000 | [diff] [blame] | 563 | trace_xfs_file_direct_write(ip, count, iocb->ki_pos); |
Christoph Hellwig | acdda3a | 2016-11-30 14:37:15 +1100 | [diff] [blame] | 564 | 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] | 565 | out: |
Christoph Hellwig | 6552321 | 2016-11-30 14:33:25 +1100 | [diff] [blame] | 566 | xfs_iunlock(ip, iolock); |
Christoph Hellwig | d060646 | 2011-12-18 20:00:14 +0000 | [diff] [blame] | 567 | |
Dave Chinner | 6b698ed | 2015-06-04 09:18:53 +1000 | [diff] [blame] | 568 | /* |
Christoph Hellwig | 16d4d43 | 2016-07-20 11:38:55 +1000 | [diff] [blame] | 569 | * No fallback to buffered IO on errors for XFS, direct IO will either |
| 570 | * complete fully or fail. |
Dave Chinner | 6b698ed | 2015-06-04 09:18:53 +1000 | [diff] [blame] | 571 | */ |
Christoph Hellwig | 16d4d43 | 2016-07-20 11:38:55 +1000 | [diff] [blame] | 572 | ASSERT(ret < 0 || ret == count); |
| 573 | return ret; |
| 574 | } |
| 575 | |
Arnd Bergmann | f021bd0 | 2016-07-22 09:50:55 +1000 | [diff] [blame] | 576 | static noinline ssize_t |
Christoph Hellwig | 16d4d43 | 2016-07-20 11:38:55 +1000 | [diff] [blame] | 577 | xfs_file_dax_write( |
| 578 | struct kiocb *iocb, |
| 579 | struct iov_iter *from) |
| 580 | { |
Christoph Hellwig | 6c31f49 | 2016-09-19 11:28:38 +1000 | [diff] [blame] | 581 | struct inode *inode = iocb->ki_filp->f_mapping->host; |
Christoph Hellwig | 16d4d43 | 2016-07-20 11:38:55 +1000 | [diff] [blame] | 582 | struct xfs_inode *ip = XFS_I(inode); |
Christoph Hellwig | 17879e8 | 2016-09-19 11:24:50 +1000 | [diff] [blame] | 583 | int iolock = XFS_IOLOCK_EXCL; |
Christoph Hellwig | 6c31f49 | 2016-09-19 11:28:38 +1000 | [diff] [blame] | 584 | ssize_t ret, error = 0; |
| 585 | size_t count; |
| 586 | loff_t pos; |
Christoph Hellwig | 16d4d43 | 2016-07-20 11:38:55 +1000 | [diff] [blame] | 587 | |
Christoph Hellwig | 6552321 | 2016-11-30 14:33:25 +1100 | [diff] [blame] | 588 | xfs_ilock(ip, iolock); |
Christoph Hellwig | 16d4d43 | 2016-07-20 11:38:55 +1000 | [diff] [blame] | 589 | ret = xfs_file_aio_write_checks(iocb, from, &iolock); |
| 590 | if (ret) |
| 591 | goto out; |
| 592 | |
Christoph Hellwig | 6c31f49 | 2016-09-19 11:28:38 +1000 | [diff] [blame] | 593 | pos = iocb->ki_pos; |
| 594 | count = iov_iter_count(from); |
Dave Chinner | 8b2180b | 2016-08-17 08:31:33 +1000 | [diff] [blame] | 595 | |
Christoph Hellwig | 6c31f49 | 2016-09-19 11:28:38 +1000 | [diff] [blame] | 596 | trace_xfs_file_dax_write(ip, count, pos); |
Ross Zwisler | 11c59c9 | 2016-11-08 11:32:46 +1100 | [diff] [blame] | 597 | ret = dax_iomap_rw(iocb, from, &xfs_iomap_ops); |
Christoph Hellwig | 6c31f49 | 2016-09-19 11:28:38 +1000 | [diff] [blame] | 598 | if (ret > 0 && iocb->ki_pos > i_size_read(inode)) { |
| 599 | i_size_write(inode, iocb->ki_pos); |
| 600 | error = xfs_setfilesize(ip, pos, ret); |
Christoph Hellwig | 16d4d43 | 2016-07-20 11:38:55 +1000 | [diff] [blame] | 601 | } |
Christoph Hellwig | 16d4d43 | 2016-07-20 11:38:55 +1000 | [diff] [blame] | 602 | out: |
Christoph Hellwig | 6552321 | 2016-11-30 14:33:25 +1100 | [diff] [blame] | 603 | xfs_iunlock(ip, iolock); |
Christoph Hellwig | 6c31f49 | 2016-09-19 11:28:38 +1000 | [diff] [blame] | 604 | return error ? error : ret; |
Dave Chinner | f0d26e8 | 2011-01-11 10:15:36 +1100 | [diff] [blame] | 605 | } |
| 606 | |
Christoph Hellwig | 00258e3 | 2010-02-15 09:44:47 +0000 | [diff] [blame] | 607 | STATIC ssize_t |
Dave Chinner | 637bbc7 | 2011-01-11 10:17:30 +1100 | [diff] [blame] | 608 | xfs_file_buffered_aio_write( |
| 609 | struct kiocb *iocb, |
Al Viro | b318891 | 2014-04-02 07:06:30 -0400 | [diff] [blame] | 610 | struct iov_iter *from) |
Dave Chinner | 637bbc7 | 2011-01-11 10:17:30 +1100 | [diff] [blame] | 611 | { |
| 612 | struct file *file = iocb->ki_filp; |
| 613 | struct address_space *mapping = file->f_mapping; |
| 614 | struct inode *inode = mapping->host; |
| 615 | struct xfs_inode *ip = XFS_I(inode); |
| 616 | ssize_t ret; |
| 617 | int enospc = 0; |
Brian Foster | c315509 | 2017-01-27 23:22:56 -0800 | [diff] [blame] | 618 | int iolock; |
Dave Chinner | 637bbc7 | 2011-01-11 10:17:30 +1100 | [diff] [blame] | 619 | |
Brian Foster | c315509 | 2017-01-27 23:22:56 -0800 | [diff] [blame] | 620 | write_retry: |
| 621 | iolock = XFS_IOLOCK_EXCL; |
Christoph Hellwig | 6552321 | 2016-11-30 14:33:25 +1100 | [diff] [blame] | 622 | xfs_ilock(ip, iolock); |
Dave Chinner | 637bbc7 | 2011-01-11 10:17:30 +1100 | [diff] [blame] | 623 | |
Al Viro | 99733fa | 2015-04-07 14:25:18 -0400 | [diff] [blame] | 624 | ret = xfs_file_aio_write_checks(iocb, from, &iolock); |
Dave Chinner | 4d8d158 | 2011-01-11 10:23:42 +1100 | [diff] [blame] | 625 | if (ret) |
Christoph Hellwig | d060646 | 2011-12-18 20:00:14 +0000 | [diff] [blame] | 626 | goto out; |
Dave Chinner | 637bbc7 | 2011-01-11 10:17:30 +1100 | [diff] [blame] | 627 | |
| 628 | /* We can write back this queue in page reclaim */ |
Christoph Hellwig | de1414a | 2015-01-14 10:42:36 +0100 | [diff] [blame] | 629 | current->backing_dev_info = inode_to_bdi(inode); |
Dave Chinner | 637bbc7 | 2011-01-11 10:17:30 +1100 | [diff] [blame] | 630 | |
Christoph Hellwig | 3176c3e | 2016-07-20 11:31:42 +1000 | [diff] [blame] | 631 | 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] | 632 | ret = iomap_file_buffered_write(iocb, from, &xfs_iomap_ops); |
Al Viro | 0a64bc2 | 2014-02-11 22:25:22 -0500 | [diff] [blame] | 633 | if (likely(ret >= 0)) |
Al Viro | 99733fa | 2015-04-07 14:25:18 -0400 | [diff] [blame] | 634 | iocb->ki_pos += ret; |
Brian Foster | dc06f398 | 2014-07-24 19:49:28 +1000 | [diff] [blame] | 635 | |
Dave Chinner | 637bbc7 | 2011-01-11 10:17:30 +1100 | [diff] [blame] | 636 | /* |
Brian Foster | dc06f398 | 2014-07-24 19:49:28 +1000 | [diff] [blame] | 637 | * If we hit a space limit, try to free up some lingering preallocated |
| 638 | * space before returning an error. In the case of ENOSPC, first try to |
| 639 | * write back all dirty inodes to free up some of the excess reserved |
| 640 | * metadata space. This reduces the chances that the eofblocks scan |
| 641 | * waits on dirty mappings. Since xfs_flush_inodes() is serialized, this |
| 642 | * also behaves as a filter to prevent too many eofblocks scans from |
| 643 | * running at the same time. |
Dave Chinner | 637bbc7 | 2011-01-11 10:17:30 +1100 | [diff] [blame] | 644 | */ |
Brian Foster | dc06f398 | 2014-07-24 19:49:28 +1000 | [diff] [blame] | 645 | if (ret == -EDQUOT && !enospc) { |
Brian Foster | c315509 | 2017-01-27 23:22:56 -0800 | [diff] [blame] | 646 | xfs_iunlock(ip, iolock); |
Brian Foster | dc06f398 | 2014-07-24 19:49:28 +1000 | [diff] [blame] | 647 | enospc = xfs_inode_free_quota_eofblocks(ip); |
| 648 | if (enospc) |
| 649 | goto write_retry; |
Darrick J. Wong | 83104d4 | 2016-10-03 09:11:46 -0700 | [diff] [blame] | 650 | enospc = xfs_inode_free_quota_cowblocks(ip); |
| 651 | if (enospc) |
| 652 | goto write_retry; |
Brian Foster | c315509 | 2017-01-27 23:22:56 -0800 | [diff] [blame] | 653 | iolock = 0; |
Brian Foster | dc06f398 | 2014-07-24 19:49:28 +1000 | [diff] [blame] | 654 | } else if (ret == -ENOSPC && !enospc) { |
| 655 | struct xfs_eofblocks eofb = {0}; |
| 656 | |
Dave Chinner | 637bbc7 | 2011-01-11 10:17:30 +1100 | [diff] [blame] | 657 | enospc = 1; |
Dave Chinner | 9aa0500 | 2012-10-08 21:56:04 +1100 | [diff] [blame] | 658 | xfs_flush_inodes(ip->i_mount); |
Brian Foster | c315509 | 2017-01-27 23:22:56 -0800 | [diff] [blame] | 659 | |
| 660 | xfs_iunlock(ip, iolock); |
Brian Foster | dc06f398 | 2014-07-24 19:49:28 +1000 | [diff] [blame] | 661 | eofb.eof_flags = XFS_EOF_FLAGS_SYNC; |
| 662 | xfs_icache_free_eofblocks(ip->i_mount, &eofb); |
Dave Chinner | 9aa0500 | 2012-10-08 21:56:04 +1100 | [diff] [blame] | 663 | goto write_retry; |
Dave Chinner | 637bbc7 | 2011-01-11 10:17:30 +1100 | [diff] [blame] | 664 | } |
Christoph Hellwig | d060646 | 2011-12-18 20:00:14 +0000 | [diff] [blame] | 665 | |
Dave Chinner | 637bbc7 | 2011-01-11 10:17:30 +1100 | [diff] [blame] | 666 | current->backing_dev_info = NULL; |
Christoph Hellwig | d060646 | 2011-12-18 20:00:14 +0000 | [diff] [blame] | 667 | out: |
Brian Foster | c315509 | 2017-01-27 23:22:56 -0800 | [diff] [blame] | 668 | if (iolock) |
| 669 | xfs_iunlock(ip, iolock); |
Dave Chinner | 637bbc7 | 2011-01-11 10:17:30 +1100 | [diff] [blame] | 670 | return ret; |
| 671 | } |
| 672 | |
| 673 | STATIC ssize_t |
Al Viro | bf97f3bc | 2014-04-03 14:20:23 -0400 | [diff] [blame] | 674 | xfs_file_write_iter( |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 675 | struct kiocb *iocb, |
Al Viro | bf97f3bc | 2014-04-03 14:20:23 -0400 | [diff] [blame] | 676 | struct iov_iter *from) |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 677 | { |
| 678 | struct file *file = iocb->ki_filp; |
| 679 | struct address_space *mapping = file->f_mapping; |
| 680 | struct inode *inode = mapping->host; |
Christoph Hellwig | 00258e3 | 2010-02-15 09:44:47 +0000 | [diff] [blame] | 681 | struct xfs_inode *ip = XFS_I(inode); |
Dave Chinner | 637bbc7 | 2011-01-11 10:17:30 +1100 | [diff] [blame] | 682 | ssize_t ret; |
Al Viro | bf97f3bc | 2014-04-03 14:20:23 -0400 | [diff] [blame] | 683 | size_t ocount = iov_iter_count(from); |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 684 | |
Bill O'Donnell | ff6d6af | 2015-10-12 18:21:22 +1100 | [diff] [blame] | 685 | XFS_STATS_INC(ip->i_mount, xs_write_calls); |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 686 | |
Dave Chinner | 637bbc7 | 2011-01-11 10:17:30 +1100 | [diff] [blame] | 687 | if (ocount == 0) |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 688 | return 0; |
| 689 | |
Al Viro | bf97f3bc | 2014-04-03 14:20:23 -0400 | [diff] [blame] | 690 | if (XFS_FORCED_SHUTDOWN(ip->i_mount)) |
| 691 | return -EIO; |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 692 | |
Christoph Hellwig | 16d4d43 | 2016-07-20 11:38:55 +1000 | [diff] [blame] | 693 | if (IS_DAX(inode)) |
| 694 | ret = xfs_file_dax_write(iocb, from); |
Darrick J. Wong | 0613f16 | 2016-10-03 09:11:37 -0700 | [diff] [blame] | 695 | else if (iocb->ki_flags & IOCB_DIRECT) { |
| 696 | /* |
| 697 | * Allow a directio write to fall back to a buffered |
| 698 | * write *only* in the case that we're doing a reflink |
| 699 | * CoW. In all other directio scenarios we do not |
| 700 | * allow an operation to fall back to buffered mode. |
| 701 | */ |
Al Viro | bf97f3bc | 2014-04-03 14:20:23 -0400 | [diff] [blame] | 702 | ret = xfs_file_dio_aio_write(iocb, from); |
Darrick J. Wong | 0613f16 | 2016-10-03 09:11:37 -0700 | [diff] [blame] | 703 | if (ret == -EREMCHG) |
| 704 | goto buffered; |
| 705 | } else { |
| 706 | buffered: |
Al Viro | bf97f3bc | 2014-04-03 14:20:23 -0400 | [diff] [blame] | 707 | ret = xfs_file_buffered_aio_write(iocb, from); |
Darrick J. Wong | 0613f16 | 2016-10-03 09:11:37 -0700 | [diff] [blame] | 708 | } |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 709 | |
Christoph Hellwig | d060646 | 2011-12-18 20:00:14 +0000 | [diff] [blame] | 710 | if (ret > 0) { |
Bill O'Donnell | ff6d6af | 2015-10-12 18:21:22 +1100 | [diff] [blame] | 711 | XFS_STATS_ADD(ip->i_mount, xs_write_bytes, ret); |
Christoph Hellwig | ce7ae151 | 2011-12-18 20:00:11 +0000 | [diff] [blame] | 712 | |
Christoph Hellwig | d060646 | 2011-12-18 20:00:14 +0000 | [diff] [blame] | 713 | /* Handle various SYNC-type writes */ |
Christoph Hellwig | e259221 | 2016-04-07 08:52:01 -0700 | [diff] [blame] | 714 | ret = generic_write_sync(iocb, ret); |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 715 | } |
Dave Chinner | a363f0c | 2011-01-11 10:13:53 +1100 | [diff] [blame] | 716 | return ret; |
Christoph Hellwig | dda35b8 | 2010-02-15 09:44:46 +0000 | [diff] [blame] | 717 | } |
| 718 | |
Namjae Jeon | a904b1c | 2015-03-25 15:08:56 +1100 | [diff] [blame] | 719 | #define XFS_FALLOC_FL_SUPPORTED \ |
| 720 | (FALLOC_FL_KEEP_SIZE | FALLOC_FL_PUNCH_HOLE | \ |
| 721 | FALLOC_FL_COLLAPSE_RANGE | FALLOC_FL_ZERO_RANGE | \ |
Darrick J. Wong | 98cc2db | 2016-10-03 09:11:43 -0700 | [diff] [blame] | 722 | FALLOC_FL_INSERT_RANGE | FALLOC_FL_UNSHARE_RANGE) |
Namjae Jeon | a904b1c | 2015-03-25 15:08:56 +1100 | [diff] [blame] | 723 | |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 724 | STATIC long |
| 725 | xfs_file_fallocate( |
Christoph Hellwig | 83aee9e | 2013-10-12 00:55:07 -0700 | [diff] [blame] | 726 | struct file *file, |
| 727 | int mode, |
| 728 | loff_t offset, |
| 729 | loff_t len) |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 730 | { |
Christoph Hellwig | 83aee9e | 2013-10-12 00:55:07 -0700 | [diff] [blame] | 731 | struct inode *inode = file_inode(file); |
| 732 | struct xfs_inode *ip = XFS_I(inode); |
Christoph Hellwig | 83aee9e | 2013-10-12 00:55:07 -0700 | [diff] [blame] | 733 | long error; |
Christoph Hellwig | 8add71c | 2015-02-02 09:53:56 +1100 | [diff] [blame] | 734 | enum xfs_prealloc_flags flags = 0; |
Christoph Hellwig | 781355c | 2015-02-16 11:59:50 +1100 | [diff] [blame] | 735 | uint iolock = XFS_IOLOCK_EXCL; |
Christoph Hellwig | 83aee9e | 2013-10-12 00:55:07 -0700 | [diff] [blame] | 736 | loff_t new_size = 0; |
Namjae Jeon | a904b1c | 2015-03-25 15:08:56 +1100 | [diff] [blame] | 737 | bool do_file_insert = 0; |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 738 | |
Christoph Hellwig | 83aee9e | 2013-10-12 00:55:07 -0700 | [diff] [blame] | 739 | if (!S_ISREG(inode->i_mode)) |
| 740 | return -EINVAL; |
Namjae Jeon | a904b1c | 2015-03-25 15:08:56 +1100 | [diff] [blame] | 741 | if (mode & ~XFS_FALLOC_FL_SUPPORTED) |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 742 | return -EOPNOTSUPP; |
| 743 | |
Christoph Hellwig | 781355c | 2015-02-16 11:59:50 +1100 | [diff] [blame] | 744 | xfs_ilock(ip, iolock); |
Christoph Hellwig | 6552321 | 2016-11-30 14:33:25 +1100 | [diff] [blame] | 745 | error = xfs_break_layouts(inode, &iolock); |
Christoph Hellwig | 781355c | 2015-02-16 11:59:50 +1100 | [diff] [blame] | 746 | if (error) |
| 747 | goto out_unlock; |
| 748 | |
Dave Chinner | e8e9ad4 | 2015-02-23 21:45:32 +1100 | [diff] [blame] | 749 | xfs_ilock(ip, XFS_MMAPLOCK_EXCL); |
| 750 | iolock |= XFS_MMAPLOCK_EXCL; |
| 751 | |
Christoph Hellwig | 83aee9e | 2013-10-12 00:55:07 -0700 | [diff] [blame] | 752 | if (mode & FALLOC_FL_PUNCH_HOLE) { |
| 753 | error = xfs_free_file_space(ip, offset, len); |
| 754 | if (error) |
| 755 | goto out_unlock; |
Namjae Jeon | e1d8fb8 | 2014-02-24 10:58:19 +1100 | [diff] [blame] | 756 | } else if (mode & FALLOC_FL_COLLAPSE_RANGE) { |
Fabian Frederick | 9340747 | 2017-02-27 14:28:32 -0800 | [diff] [blame] | 757 | unsigned int blksize_mask = i_blocksize(inode) - 1; |
Namjae Jeon | e1d8fb8 | 2014-02-24 10:58:19 +1100 | [diff] [blame] | 758 | |
| 759 | if (offset & blksize_mask || len & blksize_mask) { |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 760 | error = -EINVAL; |
Namjae Jeon | e1d8fb8 | 2014-02-24 10:58:19 +1100 | [diff] [blame] | 761 | goto out_unlock; |
| 762 | } |
| 763 | |
Lukas Czerner | 23fffa9 | 2014-04-12 09:56:41 -0400 | [diff] [blame] | 764 | /* |
| 765 | * There is no need to overlap collapse range with EOF, |
| 766 | * in which case it is effectively a truncate operation |
| 767 | */ |
| 768 | if (offset + len >= i_size_read(inode)) { |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 769 | error = -EINVAL; |
Lukas Czerner | 23fffa9 | 2014-04-12 09:56:41 -0400 | [diff] [blame] | 770 | goto out_unlock; |
| 771 | } |
| 772 | |
Namjae Jeon | e1d8fb8 | 2014-02-24 10:58:19 +1100 | [diff] [blame] | 773 | new_size = i_size_read(inode) - len; |
| 774 | |
| 775 | error = xfs_collapse_file_space(ip, offset, len); |
| 776 | if (error) |
| 777 | goto out_unlock; |
Namjae Jeon | a904b1c | 2015-03-25 15:08:56 +1100 | [diff] [blame] | 778 | } else if (mode & FALLOC_FL_INSERT_RANGE) { |
Fabian Frederick | 9340747 | 2017-02-27 14:28:32 -0800 | [diff] [blame] | 779 | unsigned int blksize_mask = i_blocksize(inode) - 1; |
Namjae Jeon | a904b1c | 2015-03-25 15:08:56 +1100 | [diff] [blame] | 780 | |
| 781 | new_size = i_size_read(inode) + len; |
| 782 | if (offset & blksize_mask || len & blksize_mask) { |
| 783 | error = -EINVAL; |
| 784 | goto out_unlock; |
| 785 | } |
| 786 | |
| 787 | /* check the new inode size does not wrap through zero */ |
| 788 | if (new_size > inode->i_sb->s_maxbytes) { |
| 789 | error = -EFBIG; |
| 790 | goto out_unlock; |
| 791 | } |
| 792 | |
| 793 | /* Offset should be less than i_size */ |
| 794 | if (offset >= i_size_read(inode)) { |
| 795 | error = -EINVAL; |
| 796 | goto out_unlock; |
| 797 | } |
| 798 | do_file_insert = 1; |
Christoph Hellwig | 83aee9e | 2013-10-12 00:55:07 -0700 | [diff] [blame] | 799 | } else { |
Christoph Hellwig | 8add71c | 2015-02-02 09:53:56 +1100 | [diff] [blame] | 800 | flags |= XFS_PREALLOC_SET; |
| 801 | |
Christoph Hellwig | 83aee9e | 2013-10-12 00:55:07 -0700 | [diff] [blame] | 802 | if (!(mode & FALLOC_FL_KEEP_SIZE) && |
| 803 | offset + len > i_size_read(inode)) { |
| 804 | new_size = offset + len; |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 805 | error = inode_newsize_ok(inode, new_size); |
Christoph Hellwig | 83aee9e | 2013-10-12 00:55:07 -0700 | [diff] [blame] | 806 | if (error) |
| 807 | goto out_unlock; |
| 808 | } |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 809 | |
Lukas Czerner | 376ba31 | 2014-03-13 19:07:58 +1100 | [diff] [blame] | 810 | if (mode & FALLOC_FL_ZERO_RANGE) |
| 811 | error = xfs_zero_file_space(ip, offset, len); |
Darrick J. Wong | 98cc2db | 2016-10-03 09:11:43 -0700 | [diff] [blame] | 812 | else { |
| 813 | if (mode & FALLOC_FL_UNSHARE_RANGE) { |
| 814 | error = xfs_reflink_unshare(ip, offset, len); |
| 815 | if (error) |
| 816 | goto out_unlock; |
| 817 | } |
Lukas Czerner | 376ba31 | 2014-03-13 19:07:58 +1100 | [diff] [blame] | 818 | error = xfs_alloc_file_space(ip, offset, len, |
| 819 | XFS_BMAPI_PREALLOC); |
Darrick J. Wong | 98cc2db | 2016-10-03 09:11:43 -0700 | [diff] [blame] | 820 | } |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 821 | if (error) |
| 822 | goto out_unlock; |
| 823 | } |
| 824 | |
Christoph Hellwig | 83aee9e | 2013-10-12 00:55:07 -0700 | [diff] [blame] | 825 | if (file->f_flags & O_DSYNC) |
Christoph Hellwig | 8add71c | 2015-02-02 09:53:56 +1100 | [diff] [blame] | 826 | flags |= XFS_PREALLOC_SYNC; |
| 827 | |
| 828 | error = xfs_update_prealloc_flags(ip, flags); |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 829 | if (error) |
| 830 | goto out_unlock; |
| 831 | |
| 832 | /* Change file size if needed */ |
| 833 | if (new_size) { |
| 834 | struct iattr iattr; |
| 835 | |
| 836 | iattr.ia_valid = ATTR_SIZE; |
| 837 | iattr.ia_size = new_size; |
Jan Kara | 69bca80 | 2016-05-26 14:46:43 +0200 | [diff] [blame] | 838 | error = xfs_vn_setattr_size(file_dentry(file), &iattr); |
Namjae Jeon | a904b1c | 2015-03-25 15:08:56 +1100 | [diff] [blame] | 839 | if (error) |
| 840 | goto out_unlock; |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 841 | } |
| 842 | |
Namjae Jeon | a904b1c | 2015-03-25 15:08:56 +1100 | [diff] [blame] | 843 | /* |
| 844 | * Perform hole insertion now that the file size has been |
| 845 | * updated so that if we crash during the operation we don't |
| 846 | * leave shifted extents past EOF and hence losing access to |
| 847 | * the data that is contained within them. |
| 848 | */ |
| 849 | if (do_file_insert) |
| 850 | error = xfs_insert_file_space(ip, offset, len); |
| 851 | |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 852 | out_unlock: |
Christoph Hellwig | 781355c | 2015-02-16 11:59:50 +1100 | [diff] [blame] | 853 | xfs_iunlock(ip, iolock); |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 854 | return error; |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 855 | } |
| 856 | |
Darrick J. Wong | 9fe2604 | 2016-10-03 09:11:40 -0700 | [diff] [blame] | 857 | STATIC int |
| 858 | xfs_file_clone_range( |
| 859 | struct file *file_in, |
| 860 | loff_t pos_in, |
| 861 | struct file *file_out, |
| 862 | loff_t pos_out, |
| 863 | u64 len) |
| 864 | { |
Christoph Hellwig | 5faaf4f | 2016-10-20 15:50:07 +1100 | [diff] [blame] | 865 | 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] | 866 | len, false); |
| 867 | } |
| 868 | |
Darrick J. Wong | cc71466 | 2016-10-03 09:11:41 -0700 | [diff] [blame] | 869 | STATIC ssize_t |
| 870 | xfs_file_dedupe_range( |
| 871 | struct file *src_file, |
| 872 | u64 loff, |
| 873 | u64 len, |
| 874 | struct file *dst_file, |
| 875 | u64 dst_loff) |
| 876 | { |
| 877 | int error; |
| 878 | |
Christoph Hellwig | 5faaf4f | 2016-10-20 15:50:07 +1100 | [diff] [blame] | 879 | 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] | 880 | len, true); |
| 881 | if (error) |
| 882 | return error; |
| 883 | return len; |
Darrick J. Wong | 9fe2604 | 2016-10-03 09:11:40 -0700 | [diff] [blame] | 884 | } |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 885 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 886 | STATIC int |
Nathan Scott | 3562fd4 | 2006-03-14 14:00:35 +1100 | [diff] [blame] | 887 | xfs_file_open( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 888 | struct inode *inode, |
Christoph Hellwig | f999a5b | 2008-11-28 14:23:32 +1100 | [diff] [blame] | 889 | struct file *file) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 890 | { |
Christoph Hellwig | f999a5b | 2008-11-28 14:23:32 +1100 | [diff] [blame] | 891 | 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] | 892 | return -EFBIG; |
Christoph Hellwig | f999a5b | 2008-11-28 14:23:32 +1100 | [diff] [blame] | 893 | if (XFS_FORCED_SHUTDOWN(XFS_M(inode->i_sb))) |
| 894 | return -EIO; |
| 895 | return 0; |
| 896 | } |
| 897 | |
| 898 | STATIC int |
| 899 | xfs_dir_open( |
| 900 | struct inode *inode, |
| 901 | struct file *file) |
| 902 | { |
| 903 | struct xfs_inode *ip = XFS_I(inode); |
| 904 | int mode; |
| 905 | int error; |
| 906 | |
| 907 | error = xfs_file_open(inode, file); |
| 908 | if (error) |
| 909 | return error; |
| 910 | |
| 911 | /* |
| 912 | * If there are any blocks, read-ahead block 0 as we're almost |
| 913 | * certain to have the next operation be a read there. |
| 914 | */ |
Christoph Hellwig | 309ecac8 | 2013-12-06 12:30:09 -0800 | [diff] [blame] | 915 | mode = xfs_ilock_data_map_shared(ip); |
Christoph Hellwig | f999a5b | 2008-11-28 14:23:32 +1100 | [diff] [blame] | 916 | if (ip->i_d.di_nextents > 0) |
Darrick J. Wong | 7a652bb | 2017-02-02 15:13:58 -0800 | [diff] [blame] | 917 | error = xfs_dir3_data_readahead(ip, 0, -1); |
Christoph Hellwig | f999a5b | 2008-11-28 14:23:32 +1100 | [diff] [blame] | 918 | xfs_iunlock(ip, mode); |
Darrick J. Wong | 7a652bb | 2017-02-02 15:13:58 -0800 | [diff] [blame] | 919 | return error; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 920 | } |
| 921 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 922 | STATIC int |
Nathan Scott | 3562fd4 | 2006-03-14 14:00:35 +1100 | [diff] [blame] | 923 | xfs_file_release( |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 924 | struct inode *inode, |
| 925 | struct file *filp) |
| 926 | { |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 927 | return xfs_release(XFS_I(inode)); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 928 | } |
| 929 | |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 930 | STATIC int |
Nathan Scott | 3562fd4 | 2006-03-14 14:00:35 +1100 | [diff] [blame] | 931 | xfs_file_readdir( |
Al Viro | b822755 | 2013-05-22 17:07:56 -0400 | [diff] [blame] | 932 | struct file *file, |
| 933 | struct dir_context *ctx) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 934 | { |
Al Viro | b822755 | 2013-05-22 17:07:56 -0400 | [diff] [blame] | 935 | struct inode *inode = file_inode(file); |
Christoph Hellwig | 739bfb2 | 2007-08-29 10:58:01 +1000 | [diff] [blame] | 936 | xfs_inode_t *ip = XFS_I(inode); |
Christoph Hellwig | 051e7cd | 2007-08-28 13:58:24 +1000 | [diff] [blame] | 937 | size_t bufsize; |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 938 | |
Christoph Hellwig | 051e7cd | 2007-08-28 13:58:24 +1000 | [diff] [blame] | 939 | /* |
| 940 | * The Linux API doesn't pass down the total size of the buffer |
| 941 | * we read into down to the filesystem. With the filldir concept |
| 942 | * it's not needed for correct information, but the XFS dir2 leaf |
| 943 | * code wants an estimate of the buffer size to calculate it's |
| 944 | * readahead window and size the buffers used for mapping to |
| 945 | * physical blocks. |
| 946 | * |
| 947 | * Try to give it an estimate that's good enough, maybe at some |
| 948 | * point we can change the ->readdir prototype to include the |
Eric Sandeen | a9cc799 | 2010-02-03 17:50:13 +0000 | [diff] [blame] | 949 | * buffer size. For now we use the current glibc buffer size. |
Christoph Hellwig | 051e7cd | 2007-08-28 13:58:24 +1000 | [diff] [blame] | 950 | */ |
Eric Sandeen | a9cc799 | 2010-02-03 17:50:13 +0000 | [diff] [blame] | 951 | 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] | 952 | |
kbuild test robot | 8300475 | 2014-12-01 08:25:28 +1100 | [diff] [blame] | 953 | return xfs_readdir(ip, ctx, bufsize); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 954 | } |
| 955 | |
David Chinner | 4f57dbc | 2007-07-19 16:28:17 +1000 | [diff] [blame] | 956 | /* |
Jeff Liu | d126d43 | 2012-08-21 17:11:57 +0800 | [diff] [blame] | 957 | * This type is designed to indicate the type of offset we would like |
Eric Sandeen | 49c6959 | 2014-09-09 11:56:48 +1000 | [diff] [blame] | 958 | * to search from page cache for xfs_seek_hole_data(). |
Jeff Liu | d126d43 | 2012-08-21 17:11:57 +0800 | [diff] [blame] | 959 | */ |
| 960 | enum { |
| 961 | HOLE_OFF = 0, |
| 962 | DATA_OFF, |
| 963 | }; |
| 964 | |
| 965 | /* |
| 966 | * Lookup the desired type of offset from the given page. |
| 967 | * |
| 968 | * On success, return true and the offset argument will point to the |
| 969 | * start of the region that was found. Otherwise this function will |
| 970 | * return false and keep the offset argument unchanged. |
| 971 | */ |
| 972 | STATIC bool |
| 973 | xfs_lookup_buffer_offset( |
| 974 | struct page *page, |
| 975 | loff_t *offset, |
| 976 | unsigned int type) |
| 977 | { |
| 978 | loff_t lastoff = page_offset(page); |
| 979 | bool found = false; |
| 980 | struct buffer_head *bh, *head; |
| 981 | |
| 982 | bh = head = page_buffers(page); |
| 983 | do { |
| 984 | /* |
| 985 | * Unwritten extents that have data in the page |
| 986 | * cache covering them can be identified by the |
| 987 | * BH_Unwritten state flag. Pages with multiple |
| 988 | * buffers might have a mix of holes, data and |
| 989 | * unwritten extents - any buffer with valid |
| 990 | * data in it should have BH_Uptodate flag set |
| 991 | * on it. |
| 992 | */ |
| 993 | if (buffer_unwritten(bh) || |
| 994 | buffer_uptodate(bh)) { |
| 995 | if (type == DATA_OFF) |
| 996 | found = true; |
| 997 | } else { |
| 998 | if (type == HOLE_OFF) |
| 999 | found = true; |
| 1000 | } |
| 1001 | |
| 1002 | if (found) { |
| 1003 | *offset = lastoff; |
| 1004 | break; |
| 1005 | } |
| 1006 | lastoff += bh->b_size; |
| 1007 | } while ((bh = bh->b_this_page) != head); |
| 1008 | |
| 1009 | return found; |
| 1010 | } |
| 1011 | |
| 1012 | /* |
| 1013 | * This routine is called to find out and return a data or hole offset |
| 1014 | * from the page cache for unwritten extents according to the desired |
Eric Sandeen | 49c6959 | 2014-09-09 11:56:48 +1000 | [diff] [blame] | 1015 | * type for xfs_seek_hole_data(). |
Jeff Liu | d126d43 | 2012-08-21 17:11:57 +0800 | [diff] [blame] | 1016 | * |
| 1017 | * The argument offset is used to tell where we start to search from the |
| 1018 | * page cache. Map is used to figure out the end points of the range to |
| 1019 | * lookup pages. |
| 1020 | * |
| 1021 | * Return true if the desired type of offset was found, and the argument |
| 1022 | * offset is filled with that address. Otherwise, return false and keep |
| 1023 | * offset unchanged. |
| 1024 | */ |
| 1025 | STATIC bool |
| 1026 | xfs_find_get_desired_pgoff( |
| 1027 | struct inode *inode, |
| 1028 | struct xfs_bmbt_irec *map, |
| 1029 | unsigned int type, |
| 1030 | loff_t *offset) |
| 1031 | { |
| 1032 | struct xfs_inode *ip = XFS_I(inode); |
| 1033 | struct xfs_mount *mp = ip->i_mount; |
| 1034 | struct pagevec pvec; |
| 1035 | pgoff_t index; |
| 1036 | pgoff_t end; |
| 1037 | loff_t endoff; |
| 1038 | loff_t startoff = *offset; |
| 1039 | loff_t lastoff = startoff; |
| 1040 | bool found = false; |
| 1041 | |
| 1042 | pagevec_init(&pvec, 0); |
| 1043 | |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 1044 | index = startoff >> PAGE_SHIFT; |
Jeff Liu | d126d43 | 2012-08-21 17:11:57 +0800 | [diff] [blame] | 1045 | endoff = XFS_FSB_TO_B(mp, map->br_startoff + map->br_blockcount); |
Kirill A. Shutemov | 09cbfea | 2016-04-01 15:29:47 +0300 | [diff] [blame] | 1046 | end = endoff >> PAGE_SHIFT; |
Jeff Liu | d126d43 | 2012-08-21 17:11:57 +0800 | [diff] [blame] | 1047 | do { |
| 1048 | int want; |
| 1049 | unsigned nr_pages; |
| 1050 | unsigned int i; |
| 1051 | |
| 1052 | want = min_t(pgoff_t, end - index, PAGEVEC_SIZE); |
| 1053 | nr_pages = pagevec_lookup(&pvec, inode->i_mapping, index, |
| 1054 | want); |
| 1055 | /* |
| 1056 | * No page mapped into given range. If we are searching holes |
| 1057 | * and if this is the first time we got into the loop, it means |
| 1058 | * that the given offset is landed in a hole, return it. |
| 1059 | * |
| 1060 | * If we have already stepped through some block buffers to find |
| 1061 | * holes but they all contains data. In this case, the last |
| 1062 | * offset is already updated and pointed to the end of the last |
| 1063 | * mapped page, if it does not reach the endpoint to search, |
| 1064 | * that means there should be a hole between them. |
| 1065 | */ |
| 1066 | if (nr_pages == 0) { |
| 1067 | /* Data search found nothing */ |
| 1068 | if (type == DATA_OFF) |
| 1069 | break; |
| 1070 | |
| 1071 | ASSERT(type == HOLE_OFF); |
| 1072 | if (lastoff == startoff || lastoff < endoff) { |
| 1073 | found = true; |
| 1074 | *offset = lastoff; |
| 1075 | } |
| 1076 | break; |
| 1077 | } |
| 1078 | |
| 1079 | /* |
| 1080 | * At lease we found one page. If this is the first time we |
| 1081 | * step into the loop, and if the first page index offset is |
| 1082 | * greater than the given search offset, a hole was found. |
| 1083 | */ |
| 1084 | if (type == HOLE_OFF && lastoff == startoff && |
| 1085 | lastoff < page_offset(pvec.pages[0])) { |
| 1086 | found = true; |
| 1087 | break; |
| 1088 | } |
| 1089 | |
| 1090 | for (i = 0; i < nr_pages; i++) { |
| 1091 | struct page *page = pvec.pages[i]; |
| 1092 | loff_t b_offset; |
| 1093 | |
| 1094 | /* |
| 1095 | * At this point, the page may be truncated or |
| 1096 | * invalidated (changing page->mapping to NULL), |
| 1097 | * or even swizzled back from swapper_space to tmpfs |
| 1098 | * file mapping. However, page->index will not change |
| 1099 | * because we have a reference on the page. |
| 1100 | * |
| 1101 | * Searching done if the page index is out of range. |
| 1102 | * If the current offset is not reaches the end of |
| 1103 | * the specified search range, there should be a hole |
| 1104 | * between them. |
| 1105 | */ |
| 1106 | if (page->index > end) { |
| 1107 | if (type == HOLE_OFF && lastoff < endoff) { |
| 1108 | *offset = lastoff; |
| 1109 | found = true; |
| 1110 | } |
| 1111 | goto out; |
| 1112 | } |
| 1113 | |
| 1114 | lock_page(page); |
| 1115 | /* |
| 1116 | * Page truncated or invalidated(page->mapping == NULL). |
| 1117 | * We can freely skip it and proceed to check the next |
| 1118 | * page. |
| 1119 | */ |
| 1120 | if (unlikely(page->mapping != inode->i_mapping)) { |
| 1121 | unlock_page(page); |
| 1122 | continue; |
| 1123 | } |
| 1124 | |
| 1125 | if (!page_has_buffers(page)) { |
| 1126 | unlock_page(page); |
| 1127 | continue; |
| 1128 | } |
| 1129 | |
| 1130 | found = xfs_lookup_buffer_offset(page, &b_offset, type); |
| 1131 | if (found) { |
| 1132 | /* |
| 1133 | * The found offset may be less than the start |
| 1134 | * point to search if this is the first time to |
| 1135 | * come here. |
| 1136 | */ |
| 1137 | *offset = max_t(loff_t, startoff, b_offset); |
| 1138 | unlock_page(page); |
| 1139 | goto out; |
| 1140 | } |
| 1141 | |
| 1142 | /* |
| 1143 | * We either searching data but nothing was found, or |
| 1144 | * searching hole but found a data buffer. In either |
| 1145 | * case, probably the next page contains the desired |
| 1146 | * things, update the last offset to it so. |
| 1147 | */ |
| 1148 | lastoff = page_offset(page) + PAGE_SIZE; |
| 1149 | unlock_page(page); |
| 1150 | } |
| 1151 | |
| 1152 | /* |
| 1153 | * The number of returned pages less than our desired, search |
| 1154 | * done. In this case, nothing was found for searching data, |
| 1155 | * but we found a hole behind the last offset. |
| 1156 | */ |
| 1157 | if (nr_pages < want) { |
| 1158 | if (type == HOLE_OFF) { |
| 1159 | *offset = lastoff; |
| 1160 | found = true; |
| 1161 | } |
| 1162 | break; |
| 1163 | } |
| 1164 | |
| 1165 | index = pvec.pages[i - 1]->index + 1; |
| 1166 | pagevec_release(&pvec); |
| 1167 | } while (index <= end); |
| 1168 | |
| 1169 | out: |
| 1170 | pagevec_release(&pvec); |
| 1171 | return found; |
| 1172 | } |
| 1173 | |
Eric Sandeen | 8aa7d37 | 2016-02-08 11:25:16 +1100 | [diff] [blame] | 1174 | /* |
| 1175 | * caller must lock inode with xfs_ilock_data_map_shared, |
| 1176 | * can we craft an appropriate ASSERT? |
| 1177 | * |
| 1178 | * end is because the VFS-level lseek interface is defined such that any |
| 1179 | * offset past i_size shall return -ENXIO, but we use this for quota code |
| 1180 | * which does not maintain i_size, and we want to SEEK_DATA past i_size. |
| 1181 | */ |
| 1182 | loff_t |
| 1183 | __xfs_seek_hole_data( |
| 1184 | struct inode *inode, |
Eric Sandeen | 49c6959 | 2014-09-09 11:56:48 +1000 | [diff] [blame] | 1185 | loff_t start, |
Eric Sandeen | 8aa7d37 | 2016-02-08 11:25:16 +1100 | [diff] [blame] | 1186 | loff_t end, |
Eric Sandeen | 49c6959 | 2014-09-09 11:56:48 +1000 | [diff] [blame] | 1187 | int whence) |
Jeff Liu | 3fe3e6b | 2012-05-10 21:29:17 +0800 | [diff] [blame] | 1188 | { |
Jeff Liu | 3fe3e6b | 2012-05-10 21:29:17 +0800 | [diff] [blame] | 1189 | struct xfs_inode *ip = XFS_I(inode); |
| 1190 | struct xfs_mount *mp = ip->i_mount; |
| 1191 | loff_t uninitialized_var(offset); |
Jeff Liu | 3fe3e6b | 2012-05-10 21:29:17 +0800 | [diff] [blame] | 1192 | xfs_fileoff_t fsbno; |
Eric Sandeen | 8aa7d37 | 2016-02-08 11:25:16 +1100 | [diff] [blame] | 1193 | xfs_filblks_t lastbno; |
Jeff Liu | 3fe3e6b | 2012-05-10 21:29:17 +0800 | [diff] [blame] | 1194 | int error; |
| 1195 | |
Eric Sandeen | 8aa7d37 | 2016-02-08 11:25:16 +1100 | [diff] [blame] | 1196 | if (start >= end) { |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 1197 | error = -ENXIO; |
Eric Sandeen | 8aa7d37 | 2016-02-08 11:25:16 +1100 | [diff] [blame] | 1198 | goto out_error; |
Jeff Liu | 3fe3e6b | 2012-05-10 21:29:17 +0800 | [diff] [blame] | 1199 | } |
| 1200 | |
Eric Sandeen | 49c6959 | 2014-09-09 11:56:48 +1000 | [diff] [blame] | 1201 | /* |
| 1202 | * Try to read extents from the first block indicated |
| 1203 | * by fsbno to the end block of the file. |
| 1204 | */ |
Jeff Liu | 3fe3e6b | 2012-05-10 21:29:17 +0800 | [diff] [blame] | 1205 | fsbno = XFS_B_TO_FSBT(mp, start); |
Eric Sandeen | 8aa7d37 | 2016-02-08 11:25:16 +1100 | [diff] [blame] | 1206 | lastbno = XFS_B_TO_FSB(mp, end); |
Jeff Liu | 3fe3e6b | 2012-05-10 21:29:17 +0800 | [diff] [blame] | 1207 | |
Jeff Liu | b686d1f | 2012-08-21 17:12:18 +0800 | [diff] [blame] | 1208 | for (;;) { |
| 1209 | struct xfs_bmbt_irec map[2]; |
| 1210 | int nmap = 2; |
| 1211 | unsigned int i; |
| 1212 | |
Eric Sandeen | 8aa7d37 | 2016-02-08 11:25:16 +1100 | [diff] [blame] | 1213 | error = xfs_bmapi_read(ip, fsbno, lastbno - fsbno, map, &nmap, |
Jeff Liu | b686d1f | 2012-08-21 17:12:18 +0800 | [diff] [blame] | 1214 | XFS_BMAPI_ENTIRE); |
| 1215 | if (error) |
Eric Sandeen | 8aa7d37 | 2016-02-08 11:25:16 +1100 | [diff] [blame] | 1216 | goto out_error; |
Jeff Liu | b686d1f | 2012-08-21 17:12:18 +0800 | [diff] [blame] | 1217 | |
| 1218 | /* No extents at given offset, must be beyond EOF */ |
| 1219 | if (nmap == 0) { |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 1220 | error = -ENXIO; |
Eric Sandeen | 8aa7d37 | 2016-02-08 11:25:16 +1100 | [diff] [blame] | 1221 | goto out_error; |
Jeff Liu | b686d1f | 2012-08-21 17:12:18 +0800 | [diff] [blame] | 1222 | } |
| 1223 | |
| 1224 | for (i = 0; i < nmap; i++) { |
| 1225 | offset = max_t(loff_t, start, |
| 1226 | XFS_FSB_TO_B(mp, map[i].br_startoff)); |
| 1227 | |
Eric Sandeen | 49c6959 | 2014-09-09 11:56:48 +1000 | [diff] [blame] | 1228 | /* Landed in the hole we wanted? */ |
| 1229 | if (whence == SEEK_HOLE && |
| 1230 | map[i].br_startblock == HOLESTARTBLOCK) |
| 1231 | goto out; |
| 1232 | |
| 1233 | /* Landed in the data extent we wanted? */ |
| 1234 | if (whence == SEEK_DATA && |
| 1235 | (map[i].br_startblock == DELAYSTARTBLOCK || |
| 1236 | (map[i].br_state == XFS_EXT_NORM && |
| 1237 | !isnullstartblock(map[i].br_startblock)))) |
Jeff Liu | b686d1f | 2012-08-21 17:12:18 +0800 | [diff] [blame] | 1238 | goto out; |
| 1239 | |
| 1240 | /* |
Eric Sandeen | 49c6959 | 2014-09-09 11:56:48 +1000 | [diff] [blame] | 1241 | * Landed in an unwritten extent, try to search |
| 1242 | * for hole or data from page cache. |
Jeff Liu | b686d1f | 2012-08-21 17:12:18 +0800 | [diff] [blame] | 1243 | */ |
| 1244 | if (map[i].br_state == XFS_EXT_UNWRITTEN) { |
| 1245 | if (xfs_find_get_desired_pgoff(inode, &map[i], |
Eric Sandeen | 49c6959 | 2014-09-09 11:56:48 +1000 | [diff] [blame] | 1246 | whence == SEEK_HOLE ? HOLE_OFF : DATA_OFF, |
| 1247 | &offset)) |
Jeff Liu | b686d1f | 2012-08-21 17:12:18 +0800 | [diff] [blame] | 1248 | goto out; |
| 1249 | } |
| 1250 | } |
| 1251 | |
Jeff Liu | 3fe3e6b | 2012-05-10 21:29:17 +0800 | [diff] [blame] | 1252 | /* |
Eric Sandeen | 49c6959 | 2014-09-09 11:56:48 +1000 | [diff] [blame] | 1253 | * We only received one extent out of the two requested. This |
| 1254 | * means we've hit EOF and didn't find what we are looking for. |
Jeff Liu | 3fe3e6b | 2012-05-10 21:29:17 +0800 | [diff] [blame] | 1255 | */ |
Jeff Liu | b686d1f | 2012-08-21 17:12:18 +0800 | [diff] [blame] | 1256 | if (nmap == 1) { |
Eric Sandeen | 49c6959 | 2014-09-09 11:56:48 +1000 | [diff] [blame] | 1257 | /* |
| 1258 | * If we were looking for a hole, set offset to |
| 1259 | * the end of the file (i.e., there is an implicit |
| 1260 | * hole at the end of any file). |
| 1261 | */ |
| 1262 | if (whence == SEEK_HOLE) { |
Eric Sandeen | 8aa7d37 | 2016-02-08 11:25:16 +1100 | [diff] [blame] | 1263 | offset = end; |
Eric Sandeen | 49c6959 | 2014-09-09 11:56:48 +1000 | [diff] [blame] | 1264 | break; |
| 1265 | } |
| 1266 | /* |
| 1267 | * If we were looking for data, it's nowhere to be found |
| 1268 | */ |
| 1269 | ASSERT(whence == SEEK_DATA); |
| 1270 | error = -ENXIO; |
Eric Sandeen | 8aa7d37 | 2016-02-08 11:25:16 +1100 | [diff] [blame] | 1271 | goto out_error; |
Jeff Liu | b686d1f | 2012-08-21 17:12:18 +0800 | [diff] [blame] | 1272 | } |
| 1273 | |
| 1274 | ASSERT(i > 1); |
| 1275 | |
| 1276 | /* |
Eric Sandeen | 49c6959 | 2014-09-09 11:56:48 +1000 | [diff] [blame] | 1277 | * Nothing was found, proceed to the next round of search |
| 1278 | * if the next reading offset is not at or beyond EOF. |
Jeff Liu | b686d1f | 2012-08-21 17:12:18 +0800 | [diff] [blame] | 1279 | */ |
| 1280 | fsbno = map[i - 1].br_startoff + map[i - 1].br_blockcount; |
| 1281 | start = XFS_FSB_TO_B(mp, fsbno); |
Eric Sandeen | 8aa7d37 | 2016-02-08 11:25:16 +1100 | [diff] [blame] | 1282 | if (start >= end) { |
Eric Sandeen | 49c6959 | 2014-09-09 11:56:48 +1000 | [diff] [blame] | 1283 | if (whence == SEEK_HOLE) { |
Eric Sandeen | 8aa7d37 | 2016-02-08 11:25:16 +1100 | [diff] [blame] | 1284 | offset = end; |
Eric Sandeen | 49c6959 | 2014-09-09 11:56:48 +1000 | [diff] [blame] | 1285 | break; |
| 1286 | } |
| 1287 | ASSERT(whence == SEEK_DATA); |
| 1288 | error = -ENXIO; |
Eric Sandeen | 8aa7d37 | 2016-02-08 11:25:16 +1100 | [diff] [blame] | 1289 | goto out_error; |
Jeff Liu | b686d1f | 2012-08-21 17:12:18 +0800 | [diff] [blame] | 1290 | } |
Jeff Liu | 3fe3e6b | 2012-05-10 21:29:17 +0800 | [diff] [blame] | 1291 | } |
| 1292 | |
Jeff Liu | b686d1f | 2012-08-21 17:12:18 +0800 | [diff] [blame] | 1293 | out: |
| 1294 | /* |
Eric Sandeen | 49c6959 | 2014-09-09 11:56:48 +1000 | [diff] [blame] | 1295 | * If at this point we have found the hole we wanted, the returned |
Jeff Liu | b686d1f | 2012-08-21 17:12:18 +0800 | [diff] [blame] | 1296 | * offset may be bigger than the file size as it may be aligned to |
Eric Sandeen | 49c6959 | 2014-09-09 11:56:48 +1000 | [diff] [blame] | 1297 | * page boundary for unwritten extents. We need to deal with this |
Jeff Liu | b686d1f | 2012-08-21 17:12:18 +0800 | [diff] [blame] | 1298 | * situation in particular. |
| 1299 | */ |
Eric Sandeen | 49c6959 | 2014-09-09 11:56:48 +1000 | [diff] [blame] | 1300 | if (whence == SEEK_HOLE) |
Eric Sandeen | 8aa7d37 | 2016-02-08 11:25:16 +1100 | [diff] [blame] | 1301 | offset = min_t(loff_t, offset, end); |
| 1302 | |
| 1303 | return offset; |
| 1304 | |
| 1305 | out_error: |
| 1306 | return error; |
| 1307 | } |
| 1308 | |
| 1309 | STATIC loff_t |
| 1310 | xfs_seek_hole_data( |
| 1311 | struct file *file, |
| 1312 | loff_t start, |
| 1313 | int whence) |
| 1314 | { |
| 1315 | struct inode *inode = file->f_mapping->host; |
| 1316 | struct xfs_inode *ip = XFS_I(inode); |
| 1317 | struct xfs_mount *mp = ip->i_mount; |
| 1318 | uint lock; |
| 1319 | loff_t offset, end; |
| 1320 | int error = 0; |
| 1321 | |
| 1322 | if (XFS_FORCED_SHUTDOWN(mp)) |
| 1323 | return -EIO; |
| 1324 | |
| 1325 | lock = xfs_ilock_data_map_shared(ip); |
| 1326 | |
| 1327 | end = i_size_read(inode); |
| 1328 | offset = __xfs_seek_hole_data(inode, start, end, whence); |
| 1329 | if (offset < 0) { |
| 1330 | error = offset; |
| 1331 | goto out_unlock; |
| 1332 | } |
| 1333 | |
Jie Liu | 46a1c2c | 2013-06-25 12:02:13 +0800 | [diff] [blame] | 1334 | offset = vfs_setpos(file, offset, inode->i_sb->s_maxbytes); |
Jeff Liu | 3fe3e6b | 2012-05-10 21:29:17 +0800 | [diff] [blame] | 1335 | |
| 1336 | out_unlock: |
Christoph Hellwig | 01f4f32 | 2013-12-06 12:30:08 -0800 | [diff] [blame] | 1337 | xfs_iunlock(ip, lock); |
Jeff Liu | 3fe3e6b | 2012-05-10 21:29:17 +0800 | [diff] [blame] | 1338 | |
| 1339 | if (error) |
Dave Chinner | 2451337 | 2014-06-25 14:58:08 +1000 | [diff] [blame] | 1340 | return error; |
Jeff Liu | 3fe3e6b | 2012-05-10 21:29:17 +0800 | [diff] [blame] | 1341 | return offset; |
| 1342 | } |
| 1343 | |
| 1344 | STATIC loff_t |
| 1345 | xfs_file_llseek( |
| 1346 | struct file *file, |
| 1347 | loff_t offset, |
Eric Sandeen | 59f9c00 | 2014-09-09 11:57:10 +1000 | [diff] [blame] | 1348 | int whence) |
Jeff Liu | 3fe3e6b | 2012-05-10 21:29:17 +0800 | [diff] [blame] | 1349 | { |
Eric Sandeen | 59f9c00 | 2014-09-09 11:57:10 +1000 | [diff] [blame] | 1350 | switch (whence) { |
Jeff Liu | 3fe3e6b | 2012-05-10 21:29:17 +0800 | [diff] [blame] | 1351 | case SEEK_END: |
| 1352 | case SEEK_CUR: |
| 1353 | case SEEK_SET: |
Eric Sandeen | 59f9c00 | 2014-09-09 11:57:10 +1000 | [diff] [blame] | 1354 | return generic_file_llseek(file, offset, whence); |
Jeff Liu | 3fe3e6b | 2012-05-10 21:29:17 +0800 | [diff] [blame] | 1355 | case SEEK_HOLE: |
Eric Sandeen | 49c6959 | 2014-09-09 11:56:48 +1000 | [diff] [blame] | 1356 | case SEEK_DATA: |
Eric Sandeen | 59f9c00 | 2014-09-09 11:57:10 +1000 | [diff] [blame] | 1357 | return xfs_seek_hole_data(file, offset, whence); |
Jeff Liu | 3fe3e6b | 2012-05-10 21:29:17 +0800 | [diff] [blame] | 1358 | default: |
| 1359 | return -EINVAL; |
| 1360 | } |
| 1361 | } |
| 1362 | |
Dave Chinner | de0e8c2 | 2015-02-23 21:44:19 +1100 | [diff] [blame] | 1363 | /* |
| 1364 | * Locking for serialisation of IO during page faults. This results in a lock |
| 1365 | * ordering of: |
| 1366 | * |
| 1367 | * mmap_sem (MM) |
Dave Chinner | 6b698ed | 2015-06-04 09:18:53 +1000 | [diff] [blame] | 1368 | * sb_start_pagefault(vfs, freeze) |
Dave Chinner | 13ad4fe | 2015-11-03 12:37:02 +1100 | [diff] [blame] | 1369 | * i_mmaplock (XFS - truncate serialisation) |
Dave Chinner | 6b698ed | 2015-06-04 09:18:53 +1000 | [diff] [blame] | 1370 | * page_lock (MM) |
| 1371 | * i_lock (XFS - extent map serialisation) |
Dave Chinner | de0e8c2 | 2015-02-23 21:44:19 +1100 | [diff] [blame] | 1372 | */ |
Dave Chinner | de0e8c2 | 2015-02-23 21:44:19 +1100 | [diff] [blame] | 1373 | |
Dave Chinner | 075a924 | 2015-02-23 21:44:54 +1100 | [diff] [blame] | 1374 | /* |
| 1375 | * mmap()d file has taken write protection fault and is being made writable. We |
| 1376 | * can set the page state up correctly for a writable page, which means we can |
| 1377 | * do correct delalloc accounting (ENOSPC checking!) and unwritten extent |
| 1378 | * mapping. |
| 1379 | */ |
| 1380 | STATIC int |
| 1381 | xfs_filemap_page_mkwrite( |
Dave Chinner | 075a924 | 2015-02-23 21:44:54 +1100 | [diff] [blame] | 1382 | struct vm_fault *vmf) |
| 1383 | { |
Dave Jiang | 11bac80 | 2017-02-24 14:56:41 -0800 | [diff] [blame] | 1384 | struct inode *inode = file_inode(vmf->vma->vm_file); |
Dave Chinner | ec56b1f | 2015-06-04 09:18:18 +1000 | [diff] [blame] | 1385 | int ret; |
Dave Chinner | 075a924 | 2015-02-23 21:44:54 +1100 | [diff] [blame] | 1386 | |
Dave Chinner | 6b698ed | 2015-06-04 09:18:53 +1000 | [diff] [blame] | 1387 | trace_xfs_filemap_page_mkwrite(XFS_I(inode)); |
Dave Chinner | 075a924 | 2015-02-23 21:44:54 +1100 | [diff] [blame] | 1388 | |
Dave Chinner | 6b698ed | 2015-06-04 09:18:53 +1000 | [diff] [blame] | 1389 | sb_start_pagefault(inode->i_sb); |
Dave Jiang | 11bac80 | 2017-02-24 14:56:41 -0800 | [diff] [blame] | 1390 | file_update_time(vmf->vma->vm_file); |
Dave Chinner | 6b698ed | 2015-06-04 09:18:53 +1000 | [diff] [blame] | 1391 | xfs_ilock(XFS_I(inode), XFS_MMAPLOCK_SHARED); |
| 1392 | |
| 1393 | if (IS_DAX(inode)) { |
Dave Jiang | c791ace | 2017-02-24 14:57:08 -0800 | [diff] [blame] | 1394 | ret = dax_iomap_fault(vmf, PE_SIZE_PTE, &xfs_iomap_ops); |
Dave Chinner | 6b698ed | 2015-06-04 09:18:53 +1000 | [diff] [blame] | 1395 | } else { |
Dave Jiang | 11bac80 | 2017-02-24 14:56:41 -0800 | [diff] [blame] | 1396 | ret = iomap_page_mkwrite(vmf, &xfs_iomap_ops); |
Dave Chinner | 6b698ed | 2015-06-04 09:18:53 +1000 | [diff] [blame] | 1397 | ret = block_page_mkwrite_return(ret); |
| 1398 | } |
| 1399 | |
| 1400 | xfs_iunlock(XFS_I(inode), XFS_MMAPLOCK_SHARED); |
| 1401 | sb_end_pagefault(inode->i_sb); |
| 1402 | |
| 1403 | return ret; |
| 1404 | } |
| 1405 | |
| 1406 | STATIC int |
| 1407 | xfs_filemap_fault( |
Dave Chinner | 6b698ed | 2015-06-04 09:18:53 +1000 | [diff] [blame] | 1408 | struct vm_fault *vmf) |
| 1409 | { |
Dave Jiang | 11bac80 | 2017-02-24 14:56:41 -0800 | [diff] [blame] | 1410 | struct inode *inode = file_inode(vmf->vma->vm_file); |
Dave Chinner | 6b698ed | 2015-06-04 09:18:53 +1000 | [diff] [blame] | 1411 | int ret; |
| 1412 | |
Dave Chinner | b2442c5 | 2015-07-29 11:48:00 +1000 | [diff] [blame] | 1413 | trace_xfs_filemap_fault(XFS_I(inode)); |
Dave Chinner | 6b698ed | 2015-06-04 09:18:53 +1000 | [diff] [blame] | 1414 | |
| 1415 | /* DAX can shortcut the normal fault path on write faults! */ |
Dave Chinner | b2442c5 | 2015-07-29 11:48:00 +1000 | [diff] [blame] | 1416 | if ((vmf->flags & FAULT_FLAG_WRITE) && IS_DAX(inode)) |
Dave Jiang | 11bac80 | 2017-02-24 14:56:41 -0800 | [diff] [blame] | 1417 | return xfs_filemap_page_mkwrite(vmf); |
Dave Chinner | 075a924 | 2015-02-23 21:44:54 +1100 | [diff] [blame] | 1418 | |
Dave Chinner | b2442c5 | 2015-07-29 11:48:00 +1000 | [diff] [blame] | 1419 | xfs_ilock(XFS_I(inode), XFS_MMAPLOCK_SHARED); |
Christoph Hellwig | acdda3a | 2016-11-30 14:37:15 +1100 | [diff] [blame] | 1420 | if (IS_DAX(inode)) |
Dave Jiang | c791ace | 2017-02-24 14:57:08 -0800 | [diff] [blame] | 1421 | ret = dax_iomap_fault(vmf, PE_SIZE_PTE, &xfs_iomap_ops); |
Christoph Hellwig | acdda3a | 2016-11-30 14:37:15 +1100 | [diff] [blame] | 1422 | else |
Dave Jiang | 11bac80 | 2017-02-24 14:56:41 -0800 | [diff] [blame] | 1423 | ret = filemap_fault(vmf); |
Dave Chinner | b2442c5 | 2015-07-29 11:48:00 +1000 | [diff] [blame] | 1424 | xfs_iunlock(XFS_I(inode), XFS_MMAPLOCK_SHARED); |
Dave Chinner | 075a924 | 2015-02-23 21:44:54 +1100 | [diff] [blame] | 1425 | |
Dave Chinner | 6b698ed | 2015-06-04 09:18:53 +1000 | [diff] [blame] | 1426 | return ret; |
| 1427 | } |
| 1428 | |
Dave Chinner | 13ad4fe | 2015-11-03 12:37:02 +1100 | [diff] [blame] | 1429 | /* |
| 1430 | * Similar to xfs_filemap_fault(), the DAX fault path can call into here on |
| 1431 | * both read and write faults. Hence we need to handle both cases. There is no |
Dave Jiang | a2d5816 | 2017-02-24 14:56:59 -0800 | [diff] [blame] | 1432 | * ->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] | 1433 | * handle both cases here. @flags carries the information on the type of fault |
| 1434 | * occuring. |
| 1435 | */ |
Matthew Wilcox | acd76e7 | 2015-09-08 14:59:06 -0700 | [diff] [blame] | 1436 | STATIC int |
Dave Jiang | a2d5816 | 2017-02-24 14:56:59 -0800 | [diff] [blame] | 1437 | xfs_filemap_huge_fault( |
Dave Jiang | c791ace | 2017-02-24 14:57:08 -0800 | [diff] [blame] | 1438 | struct vm_fault *vmf, |
| 1439 | enum page_entry_size pe_size) |
Matthew Wilcox | acd76e7 | 2015-09-08 14:59:06 -0700 | [diff] [blame] | 1440 | { |
Dave Jiang | f420039 | 2017-02-22 15:40:06 -0800 | [diff] [blame] | 1441 | struct inode *inode = file_inode(vmf->vma->vm_file); |
Matthew Wilcox | acd76e7 | 2015-09-08 14:59:06 -0700 | [diff] [blame] | 1442 | struct xfs_inode *ip = XFS_I(inode); |
| 1443 | int ret; |
| 1444 | |
| 1445 | if (!IS_DAX(inode)) |
| 1446 | return VM_FAULT_FALLBACK; |
| 1447 | |
Dave Jiang | a2d5816 | 2017-02-24 14:56:59 -0800 | [diff] [blame] | 1448 | trace_xfs_filemap_huge_fault(ip); |
Matthew Wilcox | acd76e7 | 2015-09-08 14:59:06 -0700 | [diff] [blame] | 1449 | |
Dave Jiang | d8a849e | 2017-02-22 15:40:03 -0800 | [diff] [blame] | 1450 | if (vmf->flags & FAULT_FLAG_WRITE) { |
Dave Chinner | 13ad4fe | 2015-11-03 12:37:02 +1100 | [diff] [blame] | 1451 | sb_start_pagefault(inode->i_sb); |
Dave Jiang | f420039 | 2017-02-22 15:40:06 -0800 | [diff] [blame] | 1452 | file_update_time(vmf->vma->vm_file); |
Dave Chinner | 13ad4fe | 2015-11-03 12:37:02 +1100 | [diff] [blame] | 1453 | } |
| 1454 | |
Matthew Wilcox | acd76e7 | 2015-09-08 14:59:06 -0700 | [diff] [blame] | 1455 | xfs_ilock(XFS_I(inode), XFS_MMAPLOCK_SHARED); |
Dave Jiang | c791ace | 2017-02-24 14:57:08 -0800 | [diff] [blame] | 1456 | ret = dax_iomap_fault(vmf, pe_size, &xfs_iomap_ops); |
Matthew Wilcox | acd76e7 | 2015-09-08 14:59:06 -0700 | [diff] [blame] | 1457 | xfs_iunlock(XFS_I(inode), XFS_MMAPLOCK_SHARED); |
Dave Chinner | 13ad4fe | 2015-11-03 12:37:02 +1100 | [diff] [blame] | 1458 | |
Dave Jiang | d8a849e | 2017-02-22 15:40:03 -0800 | [diff] [blame] | 1459 | if (vmf->flags & FAULT_FLAG_WRITE) |
Dave Chinner | 13ad4fe | 2015-11-03 12:37:02 +1100 | [diff] [blame] | 1460 | sb_end_pagefault(inode->i_sb); |
Matthew Wilcox | acd76e7 | 2015-09-08 14:59:06 -0700 | [diff] [blame] | 1461 | |
| 1462 | return ret; |
| 1463 | } |
| 1464 | |
Dave Chinner | 3af4928 | 2015-11-03 12:37:02 +1100 | [diff] [blame] | 1465 | /* |
| 1466 | * pfn_mkwrite was originally inteneded to ensure we capture time stamp |
| 1467 | * updates on write faults. In reality, it's need to serialise against |
Ross Zwisler | 5eb88dc | 2016-01-22 15:10:56 -0800 | [diff] [blame] | 1468 | * truncate similar to page_mkwrite. Hence we cycle the XFS_MMAPLOCK_SHARED |
| 1469 | * to ensure we serialise the fault barrier in place. |
Dave Chinner | 3af4928 | 2015-11-03 12:37:02 +1100 | [diff] [blame] | 1470 | */ |
| 1471 | static int |
| 1472 | xfs_filemap_pfn_mkwrite( |
Dave Chinner | 3af4928 | 2015-11-03 12:37:02 +1100 | [diff] [blame] | 1473 | struct vm_fault *vmf) |
| 1474 | { |
| 1475 | |
Dave Jiang | 11bac80 | 2017-02-24 14:56:41 -0800 | [diff] [blame] | 1476 | struct inode *inode = file_inode(vmf->vma->vm_file); |
Dave Chinner | 3af4928 | 2015-11-03 12:37:02 +1100 | [diff] [blame] | 1477 | struct xfs_inode *ip = XFS_I(inode); |
| 1478 | int ret = VM_FAULT_NOPAGE; |
| 1479 | loff_t size; |
| 1480 | |
| 1481 | trace_xfs_filemap_pfn_mkwrite(ip); |
| 1482 | |
| 1483 | sb_start_pagefault(inode->i_sb); |
Dave Jiang | 11bac80 | 2017-02-24 14:56:41 -0800 | [diff] [blame] | 1484 | file_update_time(vmf->vma->vm_file); |
Dave Chinner | 3af4928 | 2015-11-03 12:37:02 +1100 | [diff] [blame] | 1485 | |
| 1486 | /* check if the faulting page hasn't raced with truncate */ |
| 1487 | xfs_ilock(ip, XFS_MMAPLOCK_SHARED); |
| 1488 | size = (i_size_read(inode) + PAGE_SIZE - 1) >> PAGE_SHIFT; |
| 1489 | if (vmf->pgoff >= size) |
| 1490 | ret = VM_FAULT_SIGBUS; |
Ross Zwisler | 5eb88dc | 2016-01-22 15:10:56 -0800 | [diff] [blame] | 1491 | else if (IS_DAX(inode)) |
Dave Jiang | 11bac80 | 2017-02-24 14:56:41 -0800 | [diff] [blame] | 1492 | ret = dax_pfn_mkwrite(vmf); |
Dave Chinner | 3af4928 | 2015-11-03 12:37:02 +1100 | [diff] [blame] | 1493 | xfs_iunlock(ip, XFS_MMAPLOCK_SHARED); |
| 1494 | sb_end_pagefault(inode->i_sb); |
| 1495 | return ret; |
| 1496 | |
| 1497 | } |
| 1498 | |
Dave Chinner | 6b698ed | 2015-06-04 09:18:53 +1000 | [diff] [blame] | 1499 | static const struct vm_operations_struct xfs_file_vm_ops = { |
| 1500 | .fault = xfs_filemap_fault, |
Dave Jiang | a2d5816 | 2017-02-24 14:56:59 -0800 | [diff] [blame] | 1501 | .huge_fault = xfs_filemap_huge_fault, |
Dave Chinner | 6b698ed | 2015-06-04 09:18:53 +1000 | [diff] [blame] | 1502 | .map_pages = filemap_map_pages, |
| 1503 | .page_mkwrite = xfs_filemap_page_mkwrite, |
Dave Chinner | 3af4928 | 2015-11-03 12:37:02 +1100 | [diff] [blame] | 1504 | .pfn_mkwrite = xfs_filemap_pfn_mkwrite, |
Dave Chinner | 6b698ed | 2015-06-04 09:18:53 +1000 | [diff] [blame] | 1505 | }; |
| 1506 | |
| 1507 | STATIC int |
| 1508 | xfs_file_mmap( |
| 1509 | struct file *filp, |
| 1510 | struct vm_area_struct *vma) |
| 1511 | { |
| 1512 | file_accessed(filp); |
| 1513 | vma->vm_ops = &xfs_file_vm_ops; |
| 1514 | if (IS_DAX(file_inode(filp))) |
Matthew Wilcox | acd76e7 | 2015-09-08 14:59:06 -0700 | [diff] [blame] | 1515 | vma->vm_flags |= VM_MIXEDMAP | VM_HUGEPAGE; |
Dave Chinner | 6b698ed | 2015-06-04 09:18:53 +1000 | [diff] [blame] | 1516 | return 0; |
Dave Chinner | 075a924 | 2015-02-23 21:44:54 +1100 | [diff] [blame] | 1517 | } |
| 1518 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 1519 | const struct file_operations xfs_file_operations = { |
Jeff Liu | 3fe3e6b | 2012-05-10 21:29:17 +0800 | [diff] [blame] | 1520 | .llseek = xfs_file_llseek, |
Al Viro | b4f5d2c | 2014-04-02 14:37:59 -0400 | [diff] [blame] | 1521 | .read_iter = xfs_file_read_iter, |
Al Viro | bf97f3bc | 2014-04-03 14:20:23 -0400 | [diff] [blame] | 1522 | .write_iter = xfs_file_write_iter, |
Al Viro | 82c156f | 2016-09-22 23:35:42 -0400 | [diff] [blame] | 1523 | .splice_read = generic_file_splice_read, |
Al Viro | 8d02076 | 2014-04-05 04:27:08 -0400 | [diff] [blame] | 1524 | .splice_write = iter_file_splice_write, |
Nathan Scott | 3562fd4 | 2006-03-14 14:00:35 +1100 | [diff] [blame] | 1525 | .unlocked_ioctl = xfs_file_ioctl, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1526 | #ifdef CONFIG_COMPAT |
Nathan Scott | 3562fd4 | 2006-03-14 14:00:35 +1100 | [diff] [blame] | 1527 | .compat_ioctl = xfs_file_compat_ioctl, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1528 | #endif |
Nathan Scott | 3562fd4 | 2006-03-14 14:00:35 +1100 | [diff] [blame] | 1529 | .mmap = xfs_file_mmap, |
| 1530 | .open = xfs_file_open, |
| 1531 | .release = xfs_file_release, |
| 1532 | .fsync = xfs_file_fsync, |
Toshi Kani | dbe6ec8 | 2016-10-07 16:59:59 -0700 | [diff] [blame] | 1533 | .get_unmapped_area = thp_get_unmapped_area, |
Christoph Hellwig | 2fe17c1 | 2011-01-14 13:07:43 +0100 | [diff] [blame] | 1534 | .fallocate = xfs_file_fallocate, |
Darrick J. Wong | 9fe2604 | 2016-10-03 09:11:40 -0700 | [diff] [blame] | 1535 | .clone_file_range = xfs_file_clone_range, |
Darrick J. Wong | cc71466 | 2016-10-03 09:11:41 -0700 | [diff] [blame] | 1536 | .dedupe_file_range = xfs_file_dedupe_range, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1537 | }; |
| 1538 | |
Arjan van de Ven | 4b6f5d2 | 2006-03-28 01:56:42 -0800 | [diff] [blame] | 1539 | const struct file_operations xfs_dir_file_operations = { |
Christoph Hellwig | f999a5b | 2008-11-28 14:23:32 +1100 | [diff] [blame] | 1540 | .open = xfs_dir_open, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1541 | .read = generic_read_dir, |
Al Viro | 3b0a3c1 | 2016-04-20 23:42:46 -0400 | [diff] [blame] | 1542 | .iterate_shared = xfs_file_readdir, |
Al Viro | 59af158 | 2008-08-24 07:24:41 -0400 | [diff] [blame] | 1543 | .llseek = generic_file_llseek, |
Nathan Scott | 3562fd4 | 2006-03-14 14:00:35 +1100 | [diff] [blame] | 1544 | .unlocked_ioctl = xfs_file_ioctl, |
Nathan Scott | d387039 | 2005-05-06 06:44:46 -0700 | [diff] [blame] | 1545 | #ifdef CONFIG_COMPAT |
Nathan Scott | 3562fd4 | 2006-03-14 14:00:35 +1100 | [diff] [blame] | 1546 | .compat_ioctl = xfs_file_compat_ioctl, |
Nathan Scott | d387039 | 2005-05-06 06:44:46 -0700 | [diff] [blame] | 1547 | #endif |
Christoph Hellwig | 1da2f2d | 2011-10-02 14:25:16 +0000 | [diff] [blame] | 1548 | .fsync = xfs_dir_fsync, |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1549 | }; |