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ocfs2: use __generic_file_write_iter()

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we can do that now - all we need is to clear IOCB_DIRECT from ->ki_flags in
"can't do dio" case.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2015-04-09 14:01:33 -04:00
parent 2ba48ce513
commit 7da839c475
1 changed files with 7 additions and 57 deletions
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64
fs/ocfs2/file.c
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@ -2259,11 +2259,11 @@ 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);
int unaligned_dio = 0;
int dropped_dio = 0;
trace_ocfs2_file_aio_write(inode, file, file->f_path.dentry,
(unsigned long long)OCFS2_I(inode)->ip_blkno,
@ -2351,7 +2351,9 @@ static ssize_t ocfs2_file_write_iter(struct kiocb *iocb,
rw_level = -1;
direct_io = 0;
iocb->ki_flags &= ~IOCB_DIRECT;
iov_iter_reexpand(from, orig_count);
dropped_dio = 1;
goto relock;
}
@ -2375,67 +2377,15 @@ static ssize_t ocfs2_file_write_iter(struct kiocb *iocb,
/* communicate with ocfs2_dio_end_io */
ocfs2_iocb_set_rw_locked(iocb, rw_level);
if (direct_io) {
loff_t endbyte;
ssize_t written_buffered;
written = generic_file_direct_write(iocb, from, iocb->ki_pos);
if (written < 0 || !iov_iter_count(from)) {
ret = written;
goto out_dio;
}
/*
* for completing the rest of the request.
*/
written_buffered = generic_perform_write(file, from, iocb->ki_pos);
/*
* 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;
}
/* We need to ensure that the page cache pages are written to
* disk and invalidated to preserve the expected O_DIRECT
* semantics.
*/
endbyte = iocb->ki_pos + written_buffered - 1;
ret = filemap_write_and_wait_range(file->f_mapping, iocb->ki_pos,
endbyte);
if (ret == 0) {
iocb->ki_pos += written_buffered;
written += written_buffered;
invalidate_mapping_pages(mapping,
iocb->ki_pos >> 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, iocb->ki_pos);
if (likely(written >= 0))
iocb->ki_pos = iocb->ki_pos + written;
current->backing_dev_info = NULL;
}
out_dio:
written = __generic_file_write_iter(iocb, from);
/* buffered aio wouldn't have proper lock coverage today */
BUG_ON(ret == -EIOCBQUEUED && !(iocb->ki_flags & IOCB_DIRECT));
BUG_ON(written == -EIOCBQUEUED && !(iocb->ki_flags & IOCB_DIRECT));
if (unlikely(written <= 0))
goto no_sync;
if (((file->f_flags & O_DSYNC) && !direct_io) || IS_SYNC(inode) ||
((file->f_flags & O_DIRECT) && !direct_io)) {
if (((file->f_flags & O_DSYNC) && !direct_io) ||
IS_SYNC(inode) || dropped_dio) {
ret = filemap_fdatawrite_range(file->f_mapping,
iocb->ki_pos - written,
iocb->ki_pos - 1);