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orangefs: make do_readv_writev() take iov_iter

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no need to build a copy of what the caller already has;
what's more, we want the one given to caller properly
advanced *and* we shouldn't depend upon it being an
iovec-backed one.

Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Mike Marshall <hubcap@omnibond.com>
This commit is contained in:
Al Viro 2015-10-08 18:22:08 -04:00 committed by Mike Marshall
parent dc4067f671
commit 0071ed1ec6
1 changed files with 9 additions and 22 deletions
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31
fs/orangefs/file.c
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@ -264,13 +264,12 @@ out:
* Note: File extended attributes override any mount options.
*/
static ssize_t do_readv_writev(enum PVFS_io_type type, struct file *file,
loff_t *offset, const struct iovec *iov, unsigned long nr_segs)
loff_t *offset, struct iov_iter *iter)
{
struct inode *inode = file->f_mapping->host;
struct pvfs2_inode_s *pvfs2_inode = PVFS2_I(inode);
struct pvfs2_khandle *handle = &pvfs2_inode->refn.khandle;
struct iov_iter iter;
size_t count = iov_length(iov, nr_segs);
size_t count = iov_iter_count(iter);
ssize_t total_count = 0;
ssize_t ret = -EINVAL;
@ -295,18 +294,13 @@ static ssize_t do_readv_writev(enum PVFS_io_type type, struct file *file,
goto out;
}
iov_iter_init(&iter, type == PVFS_IO_READ ? READ : WRITE,
iov, nr_segs, count);
while (total_count < count) {
size_t each_count;
while (iov_iter_count(iter)) {
size_t each_count = iov_iter_count(iter);
size_t amt_complete;
/* how much to transfer in this loop iteration */
each_count =
(((count - total_count) > pvfs_bufmap_size_query()) ?
pvfs_bufmap_size_query() :
(count - total_count));
if (each_count > pvfs_bufmap_size_query())
each_count = pvfs_bufmap_size_query();
gossip_debug(GOSSIP_FILE_DEBUG,
"%s(%pU): size of each_count(%d)\n",
@ -319,7 +313,7 @@ static ssize_t do_readv_writev(enum PVFS_io_type type, struct file *file,
handle,
(int)*offset);
ret = wait_for_direct_io(type, inode, offset, &iter,
ret = wait_for_direct_io(type, inode, offset, iter,
each_count, 0);
gossip_debug(GOSSIP_FILE_DEBUG,
"%s(%pU): return from wait_for_io:%d\n",
@ -426,7 +420,6 @@ static ssize_t pvfs2_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)
struct file *file = iocb->ki_filp;
loff_t pos = *(&iocb->ki_pos);
ssize_t rc = 0;
unsigned long nr_segs = iter->nr_segs;
BUG_ON(iocb->private);
@ -434,11 +427,7 @@ static ssize_t pvfs2_file_read_iter(struct kiocb *iocb, struct iov_iter *iter)
g_pvfs2_stats.reads++;
rc = do_readv_writev(PVFS_IO_READ,
file,
&pos,
iter->iov,
nr_segs);
rc = do_readv_writev(PVFS_IO_READ, file, &pos, iter);
iocb->ki_pos = pos;
return rc;
@ -448,7 +437,6 @@ static ssize_t pvfs2_file_write_iter(struct kiocb *iocb, struct iov_iter *iter)
{
struct file *file = iocb->ki_filp;
loff_t pos = *(&iocb->ki_pos);
unsigned long nr_segs = iter->nr_segs;
ssize_t rc;
BUG_ON(iocb->private);
@ -482,8 +470,7 @@ static ssize_t pvfs2_file_write_iter(struct kiocb *iocb, struct iov_iter *iter)
rc = do_readv_writev(PVFS_IO_WRITE,
file,
&pos,
iter->iov,
nr_segs);
iter);
if (rc < 0) {
gossip_err("%s: do_readv_writev failed, rc:%zd:.\n",
__func__, rc);