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ext4: use generic_file_fsync() in ext4_file_fsync() in nojournal mode

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Just use the generic function instead of duplicating it.  We only need
to reshuffle the read-only check a bit (which is there to prevent
writing to a filesystem which has been remounted read-only after error
I assume).

Reviewed-by: Zheng Liu <wenqing.lz@taobao.com>
Signed-off-by: Jan Kara <jack@suse.cz>
Signed-off-by: "Theodore Ts'o" <tytso@mit.edu>
This commit is contained in:
Jan Kara 2013-06-04 14:40:09 -04:00 committed by Theodore Ts'o
parent a115f749c1
commit 37b10dd063
1 changed files with 13 additions and 38 deletions
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51
fs/ext4/fsync.c
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@ -73,32 +73,6 @@ static int ext4_sync_parent(struct inode *inode)
return ret;
}
/**
* __sync_file - generic_file_fsync without the locking and filemap_write
* @inode: inode to sync
* @datasync: only sync essential metadata if true
*
* This is just generic_file_fsync without the locking. This is needed for
* nojournal mode to make sure this inodes data/metadata makes it to disk
* properly. The i_mutex should be held already.
*/
static int __sync_inode(struct inode *inode, int datasync)
{
int err;
int ret;
ret = sync_mapping_buffers(inode->i_mapping);
if (!(inode->i_state & I_DIRTY))
return ret;
if (datasync && !(inode->i_state & I_DIRTY_DATASYNC))
return ret;
err = sync_inode_metadata(inode, 1);
if (ret == 0)
ret = err;
return ret;
}
/*
* akpm: A new design for ext4_sync_file().
*
@ -116,7 +90,7 @@ int ext4_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
struct inode *inode = file->f_mapping->host;
struct ext4_inode_info *ei = EXT4_I(inode);
journal_t *journal = EXT4_SB(inode->i_sb)->s_journal;
int ret, err;
int ret = 0, err;
tid_t commit_tid;
bool needs_barrier = false;
@ -124,21 +98,21 @@ int ext4_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
trace_ext4_sync_file_enter(file, datasync);
if (inode->i_sb->s_flags & MS_RDONLY)
goto out_trace;
if (!journal) {
ret = generic_file_fsync(file, start, end, datasync);
if (!ret && !hlist_empty(&inode->i_dentry))
ret = ext4_sync_parent(inode);
goto out_trace;
}
ret = filemap_write_and_wait_range(inode->i_mapping, start, end);
if (ret)
return ret;
mutex_lock(&inode->i_mutex);
if (inode->i_sb->s_flags & MS_RDONLY)
goto out;
if (!journal) {
ret = __sync_inode(inode, datasync);
if (!ret && !hlist_empty(&inode->i_dentry))
ret = ext4_sync_parent(inode);
goto out;
}
/*
* data=writeback,ordered:
* The caller's filemap_fdatawrite()/wait will sync the data.
@ -168,8 +142,9 @@ int ext4_sync_file(struct file *file, loff_t start, loff_t end, int datasync)
if (!ret)
ret = err;
}
out:
out:
mutex_unlock(&inode->i_mutex);
out_trace:
trace_ext4_sync_file_exit(inode, ret);
return ret;
}