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| author | Dmitry Monakhov <dmonakhov@openvz.org> | 2012-09-29 08:41:21 +0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2012-09-29 08:41:21 +0400 |
| commit | 17335dcc471199717839b2fa3492ca36f70f1168 (patch) | |
| tree | 5f39f51868f60f8be94ca7e811d34bba443ef288 /fs/ext4/move_extent.c | |
| parent | 28a535f9a0df060569dcc786e5bc2e1de43d7dc7 (diff) | |
| download | linux-17335dcc471199717839b2fa3492ca36f70f1168.tar.xz | |
ext4: serialize dio nonlocked reads with defrag workers
Inode's block defrag and ext4_change_inode_journal_flag() may
affect nonlocked DIO reads result, so proper synchronization
required.
- Add missed inode_dio_wait() calls where appropriate
- Check inode state under extra i_dio_count reference.
Reviewed-by: Jan Kara <jack@suse.cz>
Signed-off-by: Dmitry Monakhov <dmonakhov@openvz.org>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/move_extent.c')
| -rw-r--r-- | fs/ext4/move_extent.c | 8 |
1 files changed, 8 insertions, 0 deletions
diff --git a/fs/ext4/move_extent.c b/fs/ext4/move_extent.c index 8076b96b5299..292daeeed455 100644 --- a/fs/ext4/move_extent.c +++ b/fs/ext4/move_extent.c @@ -1323,6 +1323,12 @@ ext4_move_extents(struct file *o_filp, struct file *d_filp, /* Protect orig and donor inodes against a truncate */ mext_inode_double_lock(orig_inode, donor_inode); + /* Wait for all existing dio workers */ + ext4_inode_block_unlocked_dio(orig_inode); + ext4_inode_block_unlocked_dio(donor_inode); + inode_dio_wait(orig_inode); + inode_dio_wait(donor_inode); + /* Protect extent tree against block allocations via delalloc */ double_down_write_data_sem(orig_inode, donor_inode); /* Check the filesystem environment whether move_extent can be done */ @@ -1521,6 +1527,8 @@ out: kfree(holecheck_path); } double_up_write_data_sem(orig_inode, donor_inode); + ext4_inode_resume_unlocked_dio(orig_inode); + ext4_inode_resume_unlocked_dio(donor_inode); mext_inode_double_unlock(orig_inode, donor_inode); return ret; |