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ocfs2: complete the rest request through buffer io

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Complte the rest request thourgh buffer io after direct write performed.

Signed-off-by: Joseph Qi <joseph.qi@huawei.com>
Cc: Weiwei Wang <wangww631@huawei.com>
Cc: Joel Becker <jlbec@evilplan.org>
Cc: Junxiao Bi <junxiao.bi@oracle.com>
Cc: Mark Fasheh <mfasheh@suse.com>
Cc: Xuejiufei <xuejiufei@huawei.com>
Cc: alex chen <alex.chen@huawei.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Joseph Qi 2015-02-16 16:00:09 -08:00 committed by Linus Torvalds
parent d943d59dd3
commit 3a83b342c8
1 changed files with 42 additions and 1 deletions
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43
fs/ocfs2/file.c
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@ -2253,6 +2253,7 @@ static ssize_t ocfs2_file_write_iter(struct kiocb *iocb,
u32 old_clusters;
struct file *file = iocb->ki_filp;
struct inode *inode = file_inode(file);
struct address_space *mapping = file->f_mapping;
struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
int full_coherency = !(osb->s_mount_opt &
OCFS2_MOUNT_COHERENCY_BUFFERED);
@ -2367,11 +2368,51 @@ relock:
iov_iter_truncate(from, count);
if (direct_io) {
loff_t endbyte;
ssize_t written_buffered;
written = generic_file_direct_write(iocb, from, *ppos);
if (written < 0) {
if (written < 0 || written == count) {
ret = written;
goto out_dio;
}
/*
* for completing the rest of the request.
*/
*ppos += written;
count -= written;
written_buffered = generic_perform_write(file, from, *ppos);
/*
* If generic_file_buffered_write() returned a synchronous error
* then we want to return the number of bytes which were
* direct-written, or the error code if that was zero. Note
* that this differs from normal direct-io semantics, which
* will return -EFOO even if some bytes were written.
*/
if (written_buffered < 0) {
ret = written_buffered;
goto out_dio;
}
iocb->ki_pos = *ppos + written_buffered;
/* We need to ensure that the page cache pages are written to
* disk and invalidated to preserve the expected O_DIRECT
* semantics.
*/
endbyte = *ppos + written_buffered - 1;
ret = filemap_write_and_wait_range(file->f_mapping, *ppos,
endbyte);
if (ret == 0) {
written += written_buffered;
invalidate_mapping_pages(mapping,
*ppos >> PAGE_CACHE_SHIFT,
endbyte >> PAGE_CACHE_SHIFT);
} else {
/*
* We don't know how much we wrote, so just return
* the number of bytes which were direct-written
*/
}
} else {
current->backing_dev_info = inode_to_bdi(inode);
written = generic_perform_write(file, from, *ppos);