convert the guts of nfs_direct_IO() to iov_iter
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c
index e9cde39..2172314 100644
--- a/fs/nfs/direct.c
+++ b/fs/nfs/direct.c
@@ -132,9 +132,9 @@
VM_BUG_ON(iocb->ki_nbytes != PAGE_SIZE);
if (rw == READ || rw == KERNEL_READ)
- return nfs_file_direct_read(iocb, iter->iov, iter->nr_segs, pos,
+ return nfs_file_direct_read(iocb, iter, pos,
rw == READ ? true : false);
- return nfs_file_direct_write(iocb, iter->iov, iter->nr_segs, pos,
+ return nfs_file_direct_write(iocb, iter, pos,
rw == WRITE ? true : false);
#endif /* CONFIG_NFS_SWAP */
}
@@ -414,8 +414,7 @@
}
static ssize_t nfs_direct_read_schedule_iovec(struct nfs_direct_req *dreq,
- const struct iovec *iov,
- unsigned long nr_segs,
+ struct iov_iter *iter,
loff_t pos, bool uio)
{
struct nfs_pageio_descriptor desc;
@@ -430,8 +429,8 @@
desc.pg_dreq = dreq;
atomic_inc(&inode->i_dio_count);
- for (seg = 0; seg < nr_segs; seg++) {
- const struct iovec *vec = &iov[seg];
+ for (seg = 0; seg < iter->nr_segs; seg++) {
+ const struct iovec *vec = &iter->iov[seg];
result = nfs_direct_read_schedule_segment(&desc, vec, pos, uio);
if (result < 0)
break;
@@ -461,8 +460,7 @@
/**
* nfs_file_direct_read - file direct read operation for NFS files
* @iocb: target I/O control block
- * @iov: vector of user buffers into which to read data
- * @nr_segs: size of iov vector
+ * @iter: vector of user buffers into which to read data
* @pos: byte offset in file where reading starts
*
* We use this function for direct reads instead of calling
@@ -479,8 +477,8 @@
* client must read the updated atime from the server back into its
* cache.
*/
-ssize_t nfs_file_direct_read(struct kiocb *iocb, const struct iovec *iov,
- unsigned long nr_segs, loff_t pos, bool uio)
+ssize_t nfs_file_direct_read(struct kiocb *iocb, struct iov_iter *iter,
+ loff_t pos, bool uio)
{
struct file *file = iocb->ki_filp;
struct address_space *mapping = file->f_mapping;
@@ -490,7 +488,7 @@
ssize_t result = -EINVAL;
size_t count;
- count = iov_length(iov, nr_segs);
+ count = iov_length(iter->iov, iter->nr_segs);
nfs_add_stats(mapping->host, NFSIOS_DIRECTREADBYTES, count);
dfprintk(FILE, "NFS: direct read(%pD2, %zd@%Ld)\n",
@@ -513,7 +511,7 @@
goto out_unlock;
dreq->inode = inode;
- dreq->bytes_left = iov_length(iov, nr_segs);
+ dreq->bytes_left = count;
dreq->ctx = get_nfs_open_context(nfs_file_open_context(iocb->ki_filp));
l_ctx = nfs_get_lock_context(dreq->ctx);
if (IS_ERR(l_ctx)) {
@@ -524,8 +522,8 @@
if (!is_sync_kiocb(iocb))
dreq->iocb = iocb;
- NFS_I(inode)->read_io += iov_length(iov, nr_segs);
- result = nfs_direct_read_schedule_iovec(dreq, iov, nr_segs, pos, uio);
+ NFS_I(inode)->read_io += count;
+ result = nfs_direct_read_schedule_iovec(dreq, iter, pos, uio);
mutex_unlock(&inode->i_mutex);
@@ -864,8 +862,7 @@
};
static ssize_t nfs_direct_write_schedule_iovec(struct nfs_direct_req *dreq,
- const struct iovec *iov,
- unsigned long nr_segs,
+ struct iov_iter *iter,
loff_t pos, bool uio)
{
struct nfs_pageio_descriptor desc;
@@ -880,9 +877,9 @@
get_dreq(dreq);
atomic_inc(&inode->i_dio_count);
- NFS_I(dreq->inode)->write_io += iov_length(iov, nr_segs);
- for (seg = 0; seg < nr_segs; seg++) {
- const struct iovec *vec = &iov[seg];
+ NFS_I(dreq->inode)->write_io += iov_length(iter->iov, iter->nr_segs);
+ for (seg = 0; seg < iter->nr_segs; seg++) {
+ const struct iovec *vec = &iter->iov[seg];
result = nfs_direct_write_schedule_segment(&desc, vec, pos, uio);
if (result < 0)
break;
@@ -911,8 +908,7 @@
/**
* nfs_file_direct_write - file direct write operation for NFS files
* @iocb: target I/O control block
- * @iov: vector of user buffers from which to write data
- * @nr_segs: size of iov vector
+ * @iter: vector of user buffers from which to write data
* @pos: byte offset in file where writing starts
*
* We use this function for direct writes instead of calling
@@ -930,8 +926,8 @@
* Note that O_APPEND is not supported for NFS direct writes, as there
* is no atomic O_APPEND write facility in the NFS protocol.
*/
-ssize_t nfs_file_direct_write(struct kiocb *iocb, const struct iovec *iov,
- unsigned long nr_segs, loff_t pos, bool uio)
+ssize_t nfs_file_direct_write(struct kiocb *iocb, struct iov_iter *iter,
+ loff_t pos, bool uio)
{
ssize_t result = -EINVAL;
struct file *file = iocb->ki_filp;
@@ -942,7 +938,7 @@
loff_t end;
size_t count;
- count = iov_length(iov, nr_segs);
+ count = iov_length(iter->iov, iter->nr_segs);
end = (pos + count - 1) >> PAGE_CACHE_SHIFT;
nfs_add_stats(mapping->host, NFSIOS_DIRECTWRITTENBYTES, count);
@@ -993,7 +989,7 @@
if (!is_sync_kiocb(iocb))
dreq->iocb = iocb;
- result = nfs_direct_write_schedule_iovec(dreq, iov, nr_segs, pos, uio);
+ result = nfs_direct_write_schedule_iovec(dreq, iter, pos, uio);
if (mapping->nrpages) {
invalidate_inode_pages2_range(mapping,