Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 1 | /* |
| 2 | * linux/fs/ext3/fsync.c |
| 3 | * |
| 4 | * Copyright (C) 1993 Stephen Tweedie (sct@redhat.com) |
| 5 | * from |
| 6 | * Copyright (C) 1992 Remy Card (card@masi.ibp.fr) |
| 7 | * Laboratoire MASI - Institut Blaise Pascal |
| 8 | * Universite Pierre et Marie Curie (Paris VI) |
| 9 | * from |
| 10 | * linux/fs/minix/truncate.c Copyright (C) 1991, 1992 Linus Torvalds |
Mingming Cao | ae6ddcc | 2006-09-27 01:49:27 -0700 | [diff] [blame] | 11 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 12 | * ext3fs fsync primitive |
| 13 | * |
| 14 | * Big-endian to little-endian byte-swapping/bitmaps by |
| 15 | * David S. Miller (davem@caip.rutgers.edu), 1995 |
Mingming Cao | ae6ddcc | 2006-09-27 01:49:27 -0700 | [diff] [blame] | 16 | * |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 17 | * Removed unnecessary code duplication for little endian machines |
Mingming Cao | ae6ddcc | 2006-09-27 01:49:27 -0700 | [diff] [blame] | 18 | * and excessive __inline__s. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 19 | * Andi Kleen, 1997 |
| 20 | * |
| 21 | * Major simplications and cleanup - we only need to do the metadata, because |
| 22 | * we can depend on generic_block_fdatasync() to sync the data blocks. |
| 23 | */ |
| 24 | |
Jan Kara | 56fcad2 | 2009-09-08 14:59:42 +0200 | [diff] [blame] | 25 | #include <linux/blkdev.h> |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 26 | #include <linux/writeback.h> |
Al Viro | 4613ad1 | 2012-03-29 22:30:07 -0400 | [diff] [blame] | 27 | #include "ext3.h" |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 28 | |
| 29 | /* |
| 30 | * akpm: A new design for ext3_sync_file(). |
| 31 | * |
| 32 | * This is only called from sys_fsync(), sys_fdatasync() and sys_msync(). |
| 33 | * There cannot be a transaction open by this task. |
| 34 | * Another task could have dirtied this inode. Its data can be in any |
| 35 | * state in the journalling system. |
| 36 | * |
| 37 | * What we do is just kick off a commit and wait on it. This will snapshot the |
| 38 | * inode to disk. |
| 39 | */ |
| 40 | |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 41 | int ext3_sync_file(struct file *file, loff_t start, loff_t end, int datasync) |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 42 | { |
Christoph Hellwig | 7ea8085 | 2010-05-26 17:53:25 +0200 | [diff] [blame] | 43 | struct inode *inode = file->f_mapping->host; |
Jan Kara | fe8bc91 | 2009-10-16 19:26:15 +0200 | [diff] [blame] | 44 | struct ext3_inode_info *ei = EXT3_I(inode); |
| 45 | journal_t *journal = EXT3_SB(inode->i_sb)->s_journal; |
Jan Kara | 5277970 | 2010-04-15 22:24:26 +0200 | [diff] [blame] | 46 | int ret, needs_barrier = 0; |
Jan Kara | fe8bc91 | 2009-10-16 19:26:15 +0200 | [diff] [blame] | 47 | tid_t commit_tid; |
| 48 | |
Lukas Czerner | 785c4bc | 2011-05-23 18:33:01 +0200 | [diff] [blame] | 49 | trace_ext3_sync_file_enter(file, datasync); |
| 50 | |
Dmitry Monakhov | 3df3219 | 2013-05-28 13:19:01 +0400 | [diff] [blame^] | 51 | if (inode->i_sb->s_flags & MS_RDONLY) { |
| 52 | /* Make sure that we read updated state */ |
| 53 | smp_rmb(); |
| 54 | if (EXT3_SB(inode->i_sb)->s_mount_state & EXT3_ERROR_FS) |
| 55 | return -EROFS; |
Jan Kara | fe8bc91 | 2009-10-16 19:26:15 +0200 | [diff] [blame] | 56 | return 0; |
Dmitry Monakhov | 3df3219 | 2013-05-28 13:19:01 +0400 | [diff] [blame^] | 57 | } |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 58 | ret = filemap_write_and_wait_range(inode->i_mapping, start, end); |
| 59 | if (ret) |
Linus Torvalds | 2ac232f | 2011-07-26 11:34:40 -0700 | [diff] [blame] | 60 | goto out; |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 61 | |
Stephen Hemminger | c80544d | 2007-10-18 03:07:05 -0700 | [diff] [blame] | 62 | J_ASSERT(ext3_journal_current_handle() == NULL); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 63 | |
| 64 | /* |
Jan Kara | fe8bc91 | 2009-10-16 19:26:15 +0200 | [diff] [blame] | 65 | * data=writeback,ordered: |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 66 | * The caller's filemap_fdatawrite()/wait will sync the data. |
Jan Kara | fe8bc91 | 2009-10-16 19:26:15 +0200 | [diff] [blame] | 67 | * Metadata is in the journal, we wait for a proper transaction |
| 68 | * to commit here. |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 69 | * |
| 70 | * data=journal: |
| 71 | * filemap_fdatawrite won't do anything (the buffers are clean). |
| 72 | * ext3_force_commit will write the file data into the journal and |
| 73 | * will wait on that. |
| 74 | * filemap_fdatawait() will encounter a ton of newly-dirtied pages |
| 75 | * (they were dirtied by commit). But that's OK - the blocks are |
| 76 | * safe in-journal, which is all fsync() needs to ensure. |
| 77 | */ |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 78 | if (ext3_should_journal_data(inode)) { |
Lukas Czerner | 785c4bc | 2011-05-23 18:33:01 +0200 | [diff] [blame] | 79 | ret = ext3_force_commit(inode->i_sb); |
| 80 | goto out; |
Josef Bacik | 02c24a8 | 2011-07-16 20:44:56 -0400 | [diff] [blame] | 81 | } |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 82 | |
Jan Kara | fe8bc91 | 2009-10-16 19:26:15 +0200 | [diff] [blame] | 83 | if (datasync) |
| 84 | commit_tid = atomic_read(&ei->i_datasync_tid); |
| 85 | else |
| 86 | commit_tid = atomic_read(&ei->i_sync_tid); |
Hisashi Hifumi | 3d61f75 | 2008-04-28 02:16:05 -0700 | [diff] [blame] | 87 | |
Jan Kara | 5277970 | 2010-04-15 22:24:26 +0200 | [diff] [blame] | 88 | if (test_opt(inode->i_sb, BARRIER) && |
| 89 | !journal_trans_will_send_data_barrier(journal, commit_tid)) |
| 90 | needs_barrier = 1; |
| 91 | log_start_commit(journal, commit_tid); |
| 92 | ret = log_wait_commit(journal, commit_tid); |
Jan Kara | fe8bc91 | 2009-10-16 19:26:15 +0200 | [diff] [blame] | 93 | |
Jan Kara | 56fcad2 | 2009-09-08 14:59:42 +0200 | [diff] [blame] | 94 | /* |
| 95 | * In case we didn't commit a transaction, we have to flush |
| 96 | * disk caches manually so that data really is on persistent |
| 97 | * storage |
| 98 | */ |
Jan Kara | 44f4f72 | 2012-07-09 23:40:46 +0200 | [diff] [blame] | 99 | if (needs_barrier) { |
| 100 | int err; |
| 101 | |
| 102 | err = blkdev_issue_flush(inode->i_sb->s_bdev, GFP_KERNEL, NULL); |
| 103 | if (!ret) |
| 104 | ret = err; |
| 105 | } |
Lukas Czerner | 785c4bc | 2011-05-23 18:33:01 +0200 | [diff] [blame] | 106 | out: |
| 107 | trace_ext3_sync_file_exit(inode, ret); |
Linus Torvalds | 1da177e | 2005-04-16 15:20:36 -0700 | [diff] [blame] | 108 | return ret; |
| 109 | } |