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convert the guts of nfs_direct_IO() to iov_iter

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Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
This commit is contained in:
Al Viro 2014-03-04 21:53:33 -05:00
parent d8d3d94b80
commit 619d30b4b8
3 changed files with 35 additions and 33 deletions
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46
fs/nfs/direct.c
View File

@ -132,9 +132,9 @@ ssize_t nfs_direct_IO(int rw, struct kiocb *iocb, struct iov_iter *iter, loff_t
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_segment(struct nfs_pageio_descriptor *de
}
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 @@ static ssize_t nfs_direct_read_schedule_iovec(struct nfs_direct_req *dreq,
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 @@ static ssize_t nfs_direct_read_schedule_iovec(struct nfs_direct_req *dreq,
/**
* 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 @@ static ssize_t nfs_direct_read_schedule_iovec(struct nfs_direct_req *dreq,
* 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 nfs_file_direct_read(struct kiocb *iocb, const struct iovec *iov,
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 @@ ssize_t nfs_file_direct_read(struct kiocb *iocb, const struct iovec *iov,
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 @@ ssize_t nfs_file_direct_read(struct kiocb *iocb, const struct iovec *iov,
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 const struct nfs_pgio_completion_ops nfs_direct_write_completion_ops = {
};
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 @@ static ssize_t nfs_direct_write_schedule_iovec(struct nfs_direct_req *dreq,
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 @@ static ssize_t nfs_direct_write_schedule_iovec(struct nfs_direct_req *dreq,
/**
* 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 @@ static ssize_t nfs_direct_write_schedule_iovec(struct nfs_direct_req *dreq,
* 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 @@ ssize_t nfs_file_direct_write(struct kiocb *iocb, const struct iovec *iov,
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 @@ ssize_t nfs_file_direct_write(struct kiocb *iocb, const struct iovec *iov,
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,

18
fs/nfs/file.c
View File

@ -169,14 +169,18 @@ nfs_file_read(struct kiocb *iocb, const struct iovec *iov,
unsigned long nr_segs, loff_t pos)
{
struct inode *inode = file_inode(iocb->ki_filp);
size_t count = iov_length(iov, nr_segs);
ssize_t result;
struct iov_iter to;
iov_iter_init(&to, iov, nr_segs, count, 0);
if (iocb->ki_filp->f_flags & O_DIRECT)
return nfs_file_direct_read(iocb, iov, nr_segs, pos, true);
return nfs_file_direct_read(iocb, &to, pos, true);
dprintk("NFS: read(%pD2, %lu@%lu)\n",
dprintk("NFS: read(%pD2, %zu@%lu)\n",
iocb->ki_filp,
(unsigned long) iov_length(iov, nr_segs), (unsigned long) pos);
count, (unsigned long) pos);
result = nfs_revalidate_mapping(inode, iocb->ki_filp->f_mapping);
if (!result) {
@ -643,16 +647,18 @@ ssize_t nfs_file_write(struct kiocb *iocb, const struct iovec *iov,
unsigned long written = 0;
ssize_t result;
size_t count = iov_length(iov, nr_segs);
struct iov_iter from;
iov_iter_init(&from, iov, nr_segs, count, 0);
result = nfs_key_timeout_notify(file, inode);
if (result)
return result;
if (file->f_flags & O_DIRECT)
return nfs_file_direct_write(iocb, iov, nr_segs, pos, true);
return nfs_file_direct_write(iocb, &from, pos, true);
dprintk("NFS: write(%pD2, %lu@%Ld)\n",
file, (unsigned long) count, (long long) pos);
dprintk("NFS: write(%pD2, %zu@%Ld)\n",
file, count, (long long) pos);
result = -EBUSY;
if (IS_SWAPFILE(inode))

4
include/linux/nfs_fs.h
View File

@ -461,10 +461,10 @@ extern int nfs3_removexattr (struct dentry *, const char *name);
*/
extern ssize_t nfs_direct_IO(int, struct kiocb *, struct iov_iter *, loff_t);
extern ssize_t nfs_file_direct_read(struct kiocb *iocb,
const struct iovec *iov, unsigned long nr_segs,
struct iov_iter *iter,
loff_t pos, bool uio);
extern ssize_t nfs_file_direct_write(struct kiocb *iocb,
const struct iovec *iov, unsigned long nr_segs,
struct iov_iter *iter,
loff_t pos, bool uio);
/*