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Date: Mon, 22 Oct 2012 15:21:38 +0000
From: "Myklebust, Trond" <Trond.Myklebust@...app.com>
To: Dave Kleikamp <dave.kleikamp@...cle.com>,
"linux-fsdevel@...r.kernel.org" <linux-fsdevel@...r.kernel.org>
CC: "linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
Zach Brown <zab@...bo.net>,
"Maxim V. Patlasov" <mpatlasov@...allels.com>,
"linux-nfs@...r.kernel.org" <linux-nfs@...r.kernel.org>
Subject: RE: [PATCH 20/22] nfs: add support for read_iter, write_iter
> -----Original Message-----
> From: Dave Kleikamp [mailto:dave.kleikamp@...cle.com]
> Sent: Monday, October 22, 2012 11:15 AM
> To: linux-fsdevel@...r.kernel.org
> Cc: linux-kernel@...r.kernel.org; Zach Brown; Maxim V. Patlasov; Dave
> Kleikamp; Myklebust, Trond; linux-nfs@...r.kernel.org
> Subject: [PATCH 20/22] nfs: add support for read_iter, write_iter
>
> This patch implements the read_iter and write_iter file operations which
> allow kernel code to initiate directIO. This allows the loop device to read and
> write directly to the server, bypassing the page cache.
>
> Signed-off-by: Dave Kleikamp <dave.kleikamp@...cle.com>
> Cc: Zach Brown <zab@...bo.net>
> Cc: Trond Myklebust <Trond.Myklebust@...app.com>
> Cc: linux-nfs@...r.kernel.org
> ---
> fs/nfs/direct.c | 169 +++++++++++++++++++++++++++++++++-----------
> -----
> fs/nfs/file.c | 48 ++++++++++----
> fs/nfs/internal.h | 2 +
> fs/nfs/nfs4file.c | 2 +
> include/linux/nfs_fs.h | 6 +-
> 5 files changed, 155 insertions(+), 72 deletions(-)
>
> diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c index 4532781..b1fda1c 100644
> --- a/fs/nfs/direct.c
> +++ b/fs/nfs/direct.c
> @@ -90,6 +90,7 @@ struct nfs_direct_req {
> int flags;
> #define NFS_ODIRECT_DO_COMMIT (1) /* an unstable reply
> was received */
> #define NFS_ODIRECT_RESCHED_WRITES (2) /* write verification
> failed */
> +#define NFS_ODIRECT_MARK_DIRTY (4) /* mark read pages
> dirty */
> struct nfs_writeverf verf; /* unstable write verifier */
> };
>
> @@ -131,15 +132,13 @@ ssize_t nfs_direct_IO(int rw, struct kiocb *iocb,
> struct iov_iter *iter,
>
> return -EINVAL;
> #else
> - const struct iovec *iov = iov_iter_iovec(iter);
> -
> VM_BUG_ON(iocb->ki_left != PAGE_SIZE);
> VM_BUG_ON(iocb->ki_nbytes != PAGE_SIZE);
>
> if (rw == READ || rw == KERNEL_READ)
> - return nfs_file_direct_read(iocb, iov, iter->nr_segs, pos,
> + return nfs_file_direct_read(iocb, iter, pos,
> rw == READ ? true : false);
> - return nfs_file_direct_write(iocb, iov, iter->nr_segs, pos,
> + return nfs_file_direct_write(iocb, iter, pos,
> rw == WRITE ? true : false);
> #endif /* CONFIG_NFS_SWAP */
> }
> @@ -277,7 +276,8 @@ static void nfs_direct_read_completion(struct
> nfs_pgio_header *hdr)
> hdr->good_bytes & ~PAGE_MASK,
> PAGE_SIZE);
> }
> - if (!PageCompound(page)) {
> + if ((dreq->flags & NFS_ODIRECT_MARK_DIRTY) &&
> + !PageCompound(page)) {
> if (test_bit(NFS_IOHDR_ERROR, &hdr->flags)) {
> if (bytes < hdr->good_bytes)
> set_page_dirty(page);
> @@ -414,10 +414,9 @@ static ssize_t
> nfs_direct_read_schedule_segment(struct nfs_pageio_descriptor *de
> return result < 0 ? (ssize_t) result : -EFAULT; }
>
> -static ssize_t nfs_direct_read_schedule_iovec(struct nfs_direct_req *dreq,
> - const struct iovec *iov,
> - unsigned long nr_segs,
> - loff_t pos, bool uio)
> +static ssize_t nfs_direct_read_schedule(struct nfs_direct_req *dreq,
> + struct iov_iter *iter, loff_t pos,
> + bool uio)
> {
> struct nfs_pageio_descriptor desc;
> ssize_t result = -EINVAL;
> @@ -429,16 +428,47 @@ static ssize_t
> nfs_direct_read_schedule_iovec(struct nfs_direct_req *dreq,
> get_dreq(dreq);
> desc.pg_dreq = dreq;
>
> - for (seg = 0; seg < nr_segs; seg++) {
> - const struct iovec *vec = &iov[seg];
> - result = nfs_direct_read_schedule_segment(&desc, vec,
> pos, uio);
> - if (result < 0)
> - break;
> - requested_bytes += result;
> - if ((size_t)result < vec->iov_len)
> - break;
> - pos += vec->iov_len;
> - }
> + if (iov_iter_has_iovec(iter)) {
> + const struct iovec *iov = iov_iter_iovec(iter);
> + if (uio)
> + dreq->flags = NFS_ODIRECT_MARK_DIRTY;
> + for (seg = 0; seg < iter->nr_segs; seg++) {
> + const struct iovec *vec = &iov[seg];
> + result = nfs_direct_read_schedule_segment(&desc,
> vec,
> + pos, uio);
> + if (result < 0)
> + break;
> + requested_bytes += result;
> + if ((size_t)result < vec->iov_len)
> + break;
> + pos += vec->iov_len;
> + }
> + } else if (iov_iter_has_bvec(iter)) {
> + struct nfs_open_context *ctx = dreq->ctx;
> + struct inode *inode = ctx->dentry->d_inode;
> + struct bio_vec *bvec = iov_iter_bvec(iter);
> + for (seg = 0; seg < iter->nr_segs; seg++) {
> + struct nfs_page *req;
> + unsigned int req_len = bvec[seg].bv_len;
> + req = nfs_create_request(ctx, inode,
> + bvec[seg].bv_page,
> + bvec[seg].bv_offset,
> req_len);
> + if (IS_ERR(req)) {
> + result = PTR_ERR(req);
> + break;
> + }
> + req->wb_index = pos >> PAGE_SHIFT;
> + req->wb_offset = pos & ~PAGE_MASK;
> + if (!nfs_pageio_add_request(&desc, req)) {
> + result = desc.pg_error;
> + nfs_release_request(req);
> + break;
> + }
> + requested_bytes += req_len;
> + pos += req_len;
> + }
> + } else
> + BUG();
Can we please split the contents of these 2 if statements into 2 helper functions nfs_direct_do_schedule_read_iovec() and nfs_direct_do_schedule_read_bvec()?
>
> nfs_pageio_complete(&desc);
>
> @@ -456,8 +486,8 @@ static ssize_t nfs_direct_read_schedule_iovec(struct
> nfs_direct_req *dreq,
> return 0;
> }
>
> -static ssize_t nfs_direct_read(struct kiocb *iocb, const struct iovec *iov,
> - unsigned long nr_segs, loff_t pos, bool uio)
> +static ssize_t nfs_direct_read(struct kiocb *iocb, struct iov_iter *iter,
> + loff_t pos, bool uio)
> {
> ssize_t result = -ENOMEM;
> struct inode *inode = iocb->ki_filp->f_mapping->host; @@ -469,7
> +499,7 @@ static ssize_t nfs_direct_read(struct kiocb *iocb, const struct
> iovec *iov,
> goto out;
>
> dreq->inode = inode;
> - dreq->bytes_left = iov_length(iov, nr_segs);
> + dreq->bytes_left = iov_iter_count(iter);
> 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)) {
> @@ -480,8 +510,8 @@ static ssize_t nfs_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 += iov_iter_count(iter);
> + result = nfs_direct_read_schedule(dreq, iter, pos, uio);
> if (!result)
> result = nfs_direct_wait(dreq);
> out_release:
> @@ -815,10 +845,9 @@ static const struct nfs_pgio_completion_ops
> nfs_direct_write_completion_ops = {
> .completion = nfs_direct_write_completion, };
>
> -static ssize_t nfs_direct_write_schedule_iovec(struct nfs_direct_req *dreq,
> - const struct iovec *iov,
> - unsigned long nr_segs,
> - loff_t pos, bool uio)
> +static ssize_t nfs_direct_write_schedule(struct nfs_direct_req *dreq,
> + struct iov_iter *iter, loff_t pos,
> + bool uio)
> {
> struct nfs_pageio_descriptor desc;
> struct inode *inode = dreq->inode;
> @@ -832,17 +861,48 @@ 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];
> - result = nfs_direct_write_schedule_segment(&desc, vec,
> pos, uio);
> - if (result < 0)
> - break;
> - requested_bytes += result;
> - if ((size_t)result < vec->iov_len)
> - break;
> - pos += vec->iov_len;
> - }
> + NFS_I(dreq->inode)->write_io += iov_iter_count(iter);
> +
> + if (iov_iter_has_iovec(iter)) {
> + const struct iovec *iov = iov_iter_iovec(iter);
> + for (seg = 0; seg < iter->nr_segs; seg++) {
> + const struct iovec *vec = &iov[seg];
> + result = nfs_direct_write_schedule_segment(&desc,
> vec,
> + pos, uio);
> + if (result < 0)
> + break;
> + requested_bytes += result;
> + if ((size_t)result < vec->iov_len)
> + break;
> + pos += vec->iov_len;
> + }
> + } else if (iov_iter_has_bvec(iter)) {
> + struct nfs_open_context *ctx = dreq->ctx;
> + struct bio_vec *bvec = iov_iter_bvec(iter);
> + for (seg = 0; seg < iter->nr_segs; seg++) {
> + struct nfs_page *req;
> + unsigned int req_len = bvec[seg].bv_len;
> +
> + req = nfs_create_request(ctx, inode,
> bvec[seg].bv_page,
> + bvec[seg].bv_offset,
> req_len);
> + if (IS_ERR(req)) {
> + result = PTR_ERR(req);
> + break;
> + }
> + nfs_lock_request(req);
> + req->wb_index = pos >> PAGE_SHIFT;
> + req->wb_offset = pos & ~PAGE_MASK;
> + if (!nfs_pageio_add_request(&desc, req)) {
> + result = desc.pg_error;
> + nfs_unlock_and_release_request(req);
> + break;
> + }
> + requested_bytes += req_len;
> + pos += req_len;
> + }
> + } else
> + BUG();
Ditto...
> +
> nfs_pageio_complete(&desc);
>
> /*
> @@ -860,9 +920,8 @@ static ssize_t nfs_direct_write_schedule_iovec(struct
> nfs_direct_req *dreq,
> return 0;
> }
>
> -static ssize_t nfs_direct_write(struct kiocb *iocb, const struct iovec *iov,
> - unsigned long nr_segs, loff_t pos,
> - size_t count, bool uio)
> +static ssize_t nfs_direct_write(struct kiocb *iocb, struct iov_iter *iter,
> + loff_t pos, bool uio)
> {
> ssize_t result = -ENOMEM;
> struct inode *inode = iocb->ki_filp->f_mapping->host; @@ -874,7
> +933,7 @@ static ssize_t nfs_direct_write(struct kiocb *iocb, const struct
> iovec *iov,
> goto out;
>
> dreq->inode = inode;
> - dreq->bytes_left = count;
> + dreq->bytes_left = iov_iter_count(iter);
> 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)) {
> @@ -885,7 +944,7 @@ static ssize_t nfs_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(dreq, iter, pos, uio);
> if (!result)
> result = nfs_direct_wait(dreq);
> out_release:
> @@ -897,8 +956,7 @@ out:
> /**
> * 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 buffers into which to read data
> * @pos: byte offset in file where reading starts
> *
> * We use this function for direct reads instead of calling @@ -915,15 +973,15
> @@ out:
> * 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)
> {
> ssize_t retval = -EINVAL;
> struct file *file = iocb->ki_filp;
> struct address_space *mapping = file->f_mapping;
> size_t count;
>
> - count = iov_length(iov, nr_segs);
> + count = iov_iter_count(iter);
> nfs_add_stats(mapping->host, NFSIOS_DIRECTREADBYTES, count);
>
> dfprintk(FILE, "NFS: direct read(%s/%s, %zd@%Ld)\n", @@ -941,7
> +999,7 @@ ssize_t nfs_file_direct_read(struct kiocb *iocb, const struct iovec
> *iov,
>
> task_io_account_read(count);
>
> - retval = nfs_direct_read(iocb, iov, nr_segs, pos, uio);
> + retval = nfs_direct_read(iocb, iter, pos, uio);
> if (retval > 0)
> iocb->ki_pos = pos + retval;
>
> @@ -952,8 +1010,7 @@ out:
> /**
> * 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 buffers from which to write data
> * @pos: byte offset in file where writing starts
> *
> * We use this function for direct writes instead of calling @@ -971,15
> +1028,15 @@ out:
> * 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 retval = -EINVAL;
> struct file *file = iocb->ki_filp;
> struct address_space *mapping = file->f_mapping;
> size_t count;
>
> - count = iov_length(iov, nr_segs);
> + count = iov_iter_count(iter);
> nfs_add_stats(mapping->host, NFSIOS_DIRECTWRITTENBYTES,
> count);
>
> dfprintk(FILE, "NFS: direct write(%s/%s, %zd@%Ld)\n", @@ -1004,7
> +1061,7 @@ ssize_t nfs_file_direct_write(struct kiocb *iocb, const struct
> iovec *iov,
>
> task_io_account_write(count);
>
> - retval = nfs_direct_write(iocb, iov, nr_segs, pos, count, uio);
> + retval = nfs_direct_write(iocb, iter, pos, uio);
> if (retval > 0) {
> struct inode *inode = mapping->host;
>
> diff --git a/fs/nfs/file.c b/fs/nfs/file.c index 582bb88..b4bf6ef 100644
> --- a/fs/nfs/file.c
> +++ b/fs/nfs/file.c
> @@ -172,28 +172,39 @@ nfs_file_flush(struct file *file, fl_owner_t id)
> EXPORT_SYMBOL_GPL(nfs_file_flush);
>
> ssize_t
> -nfs_file_read(struct kiocb *iocb, const struct iovec *iov,
> - unsigned long nr_segs, loff_t pos)
> +nfs_file_read_iter(struct kiocb *iocb, struct iov_iter *iter, loff_t
> +pos)
> {
> struct dentry * dentry = iocb->ki_filp->f_path.dentry;
> struct inode * inode = dentry->d_inode;
> ssize_t result;
>
> 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, iter, pos, true);
>
> - dprintk("NFS: read(%s/%s, %lu@%lu)\n",
> + dprintk("NFS: read_iter(%s/%s, %lu@%lu)\n",
> dentry->d_parent->d_name.name, dentry->d_name.name,
> - (unsigned long) iov_length(iov, nr_segs), (unsigned long)
> pos);
> + (unsigned long) iov_iter_count(iter), (unsigned long) pos);
>
> result = nfs_revalidate_mapping(inode, iocb->ki_filp->f_mapping);
> if (!result) {
> - result = generic_file_aio_read(iocb, iov, nr_segs, pos);
> + result = generic_file_read_iter(iocb, iter, pos);
> if (result > 0)
> nfs_add_stats(inode, NFSIOS_NORMALREADBYTES,
> result);
> }
> return result;
> }
> +EXPORT_SYMBOL_GPL(nfs_file_read_iter);
> +
> +ssize_t
> +nfs_file_read(struct kiocb *iocb, const struct iovec *iov,
> + unsigned long nr_segs, loff_t pos)
> +{
> + struct iov_iter iter;
> +
> + iov_iter_init(&iter, iov, nr_segs, iov_length(iov, nr_segs), 0);
> +
> + return nfs_file_read_iter(iocb, &iter, pos); }
> EXPORT_SYMBOL_GPL(nfs_file_read);
>
> ssize_t
> @@ -610,19 +621,19 @@ static int nfs_need_sync_write(struct file *filp,
> struct inode *inode)
> return 0;
> }
>
> -ssize_t nfs_file_write(struct kiocb *iocb, const struct iovec *iov,
> - unsigned long nr_segs, loff_t pos)
> +ssize_t nfs_file_write_iter(struct kiocb *iocb, struct iov_iter *iter,
> + loff_t pos)
> {
> struct dentry * dentry = iocb->ki_filp->f_path.dentry;
> struct inode * inode = dentry->d_inode;
> unsigned long written = 0;
> ssize_t result;
> - size_t count = iov_length(iov, nr_segs);
> + size_t count = iov_iter_count(iter);
>
> if (iocb->ki_filp->f_flags & O_DIRECT)
> - return nfs_file_direct_write(iocb, iov, nr_segs, pos, true);
> + return nfs_file_direct_write(iocb, iter, pos, true);
>
> - dprintk("NFS: write(%s/%s, %lu@%Ld)\n",
> + dprintk("NFS: write_iter(%s/%s, %lu@...d)\n",
> dentry->d_parent->d_name.name, dentry->d_name.name,
> (unsigned long) count, (long long) pos);
>
> @@ -642,7 +653,7 @@ ssize_t nfs_file_write(struct kiocb *iocb, const struct
> iovec *iov,
> if (!count)
> goto out;
>
> - result = generic_file_aio_write(iocb, iov, nr_segs, pos);
> + result = generic_file_write_iter(iocb, iter, pos);
> if (result > 0)
> written = result;
>
> @@ -661,6 +672,17 @@ out_swapfile:
> printk(KERN_INFO "NFS: attempt to write to active swap file!\n");
> goto out;
> }
> +EXPORT_SYMBOL_GPL(nfs_file_write_iter);
> +
> +ssize_t nfs_file_write(struct kiocb *iocb, const struct iovec *iov,
> + unsigned long nr_segs, loff_t pos) {
> + struct iov_iter iter;
> +
> + iov_iter_init(&iter, iov, nr_segs, iov_length(iov, nr_segs), 0);
> +
> + return nfs_file_write_iter(iocb, &iter, pos); }
> EXPORT_SYMBOL_GPL(nfs_file_write);
>
> ssize_t nfs_file_splice_write(struct pipe_inode_info *pipe, @@ -914,6
> +936,8 @@ const struct file_operations nfs_file_operations = {
> .write = do_sync_write,
> .aio_read = nfs_file_read,
> .aio_write = nfs_file_write,
> + .read_iter = nfs_file_read_iter,
> + .write_iter = nfs_file_write_iter,
> .mmap = nfs_file_mmap,
> .open = nfs_file_open,
> .flush = nfs_file_flush,
> diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h index 59b133c..8db3b11
> 100644
> --- a/fs/nfs/internal.h
> +++ b/fs/nfs/internal.h
> @@ -302,10 +302,12 @@ int nfs_file_fsync_commit(struct file *, loff_t,
> loff_t, int); loff_t nfs_file_llseek(struct file *, loff_t, int); int
> nfs_file_flush(struct file *, fl_owner_t); ssize_t nfs_file_read(struct kiocb *,
> const struct iovec *, unsigned long, loff_t);
> +ssize_t nfs_file_read_iter(struct kiocb *, struct iov_iter *, loff_t);
> ssize_t nfs_file_splice_read(struct file *, loff_t *, struct pipe_inode_info *,
> size_t, unsigned int);
> int nfs_file_mmap(struct file *, struct vm_area_struct *); ssize_t
> nfs_file_write(struct kiocb *, const struct iovec *, unsigned long, loff_t);
> +ssize_t nfs_file_write_iter(struct kiocb *, struct iov_iter *, loff_t);
> int nfs_file_release(struct inode *, struct file *); int nfs_lock(struct file *, int,
> struct file_lock *); int nfs_flock(struct file *, int, struct file_lock *); diff --git
> a/fs/nfs/nfs4file.c b/fs/nfs/nfs4file.c index afddd66..195188e 100644
> --- a/fs/nfs/nfs4file.c
> +++ b/fs/nfs/nfs4file.c
> @@ -123,6 +123,8 @@ const struct file_operations nfs4_file_operations = {
> .write = do_sync_write,
> .aio_read = nfs_file_read,
> .aio_write = nfs_file_write,
> + .read_iter = nfs_file_read_iter,
> + .write_iter = nfs_file_write_iter,
> .mmap = nfs_file_mmap,
> .open = nfs4_file_open,
> .flush = nfs_file_flush,
> diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h index
> 4913e3c..9f8e8a9 100644
> --- a/include/linux/nfs_fs.h
> +++ b/include/linux/nfs_fs.h
> @@ -445,11 +445,9 @@ extern int nfs3_removexattr (struct dentry *, const
> char *name);
> * linux/fs/nfs/direct.c
> */
> 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,
> +extern ssize_t nfs_file_direct_read(struct kiocb *iocb, 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,
> +extern ssize_t nfs_file_direct_write(struct kiocb *iocb, struct
> +iov_iter *iter,
> loff_t pos, bool uio);
>
> /*
Otherwise, everything looks fine to me...
Acked-by: Trond Myklebust <Trond.Myklebust@...app.com>
Cheers
Trond
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