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| author | Eric Sandeen <sandeen@redhat.com> | 2008-07-11 19:27:31 -0400 |
|---|---|---|
| committer | Theodore Ts'o <tytso@mit.edu> | 2008-07-11 19:27:31 -0400 |
| commit | d755fb384250d6bd7fd18a0930e71965acc8e72e (patch) | |
| tree | 7913bce90918cd26c8a5fe05f6c8943828e333bb /fs/ext4/fsync.c | |
| parent | 654b4908bc17a6318d18f3036fecc5155de92f55 (diff) | |
| download | lwn-d755fb384250d6bd7fd18a0930e71965acc8e72e.tar.gz lwn-d755fb384250d6bd7fd18a0930e71965acc8e72e.zip | |
ext4: call blkdev_issue_flush on fsync
To ensure that bits are truly on-disk after an fsync,
we should call blkdev_issue_flush if barriers are supported.
Inspired by an old thread on barriers, by reiserfs & xfs
which do the same, and by a patch SuSE ships with their kernel
Signed-off-by: Eric Sandeen <sandeen@redhat.com>
Signed-off-by: Mingming Cao <cmm@us.ibm.com>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
Diffstat (limited to 'fs/ext4/fsync.c')
| -rw-r--r-- | fs/ext4/fsync.c | 4 |
1 files changed, 4 insertions, 0 deletions
diff --git a/fs/ext4/fsync.c b/fs/ext4/fsync.c index 1c8ba48d4f8d..a45c3737ad31 100644 --- a/fs/ext4/fsync.c +++ b/fs/ext4/fsync.c @@ -27,6 +27,7 @@ #include <linux/sched.h> #include <linux/writeback.h> #include <linux/jbd2.h> +#include <linux/blkdev.h> #include "ext4.h" #include "ext4_jbd2.h" @@ -45,6 +46,7 @@ int ext4_sync_file(struct file * file, struct dentry *dentry, int datasync) { struct inode *inode = dentry->d_inode; + journal_t *journal = EXT4_SB(inode->i_sb)->s_journal; int ret = 0; J_ASSERT(ext4_journal_current_handle() == NULL); @@ -85,6 +87,8 @@ int ext4_sync_file(struct file * file, struct dentry *dentry, int datasync) .nr_to_write = 0, /* sys_fsync did this */ }; ret = sync_inode(inode, &wbc); + if (journal && (journal->j_flags & JBD2_BARRIER)) + blkdev_issue_flush(inode->i_sb->s_bdev, NULL); } out: return ret; |