From d8d3d94b80aa1a1c0ca75c58b8abdc7356f38418 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Tue, 4 Mar 2014 21:27:34 -0500 Subject: pass iov_iter to ->direct_IO() unmodified, for now Signed-off-by: Al Viro --- fs/nfs/direct.c | 8 ++++---- 1 file changed, 4 insertions(+), 4 deletions(-) (limited to 'fs/nfs') diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c index b8797ae..e9cde39 100644 --- a/fs/nfs/direct.c +++ b/fs/nfs/direct.c @@ -121,20 +121,20 @@ static inline int put_dreq(struct nfs_direct_req *dreq) * shunt off direct read and write requests before the VFS gets them, * so this method is only ever called for swap. */ -ssize_t nfs_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov, loff_t pos, unsigned long nr_segs) +ssize_t nfs_direct_IO(int rw, struct kiocb *iocb, struct iov_iter *iter, loff_t pos) { #ifndef CONFIG_NFS_SWAP dprintk("NFS: nfs_direct_IO (%pD) off/no(%Ld/%lu) EINVAL\n", - iocb->ki_filp, (long long) pos, nr_segs); + iocb->ki_filp, (long long) pos, iter->nr_segs); return -EINVAL; #else VM_BUG_ON(iocb->ki_nbytes != PAGE_SIZE); if (rw == READ || rw == KERNEL_READ) - return nfs_file_direct_read(iocb, iov, nr_segs, pos, + return nfs_file_direct_read(iocb, iter->iov, iter->nr_segs, pos, rw == READ ? true : false); - return nfs_file_direct_write(iocb, iov, nr_segs, pos, + return nfs_file_direct_write(iocb, iter->iov, iter->nr_segs, pos, rw == WRITE ? true : false); #endif /* CONFIG_NFS_SWAP */ } -- cgit v1.1 From 619d30b4b8c488042b4a720ca79dccc346d1a516 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Tue, 4 Mar 2014 21:53:33 -0500 Subject: convert the guts of nfs_direct_IO() to iov_iter Signed-off-by: Al Viro --- fs/nfs/direct.c | 46 +++++++++++++++++++++------------------------- fs/nfs/file.c | 18 ++++++++++++------ 2 files changed, 33 insertions(+), 31 deletions(-) (limited to 'fs/nfs') 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 @@ 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, diff --git a/fs/nfs/file.c b/fs/nfs/file.c index 284ca90..3d01b15 100644 --- a/fs/nfs/file.c +++ b/fs/nfs/file.c @@ -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)) -- cgit v1.1 From a6cbcd4a4a85e2fdb0b3344b88df2e8b3d526b9e Mon Sep 17 00:00:00 2001 From: Al Viro Date: Tue, 4 Mar 2014 22:38:00 -0500 Subject: get rid of pointless iov_length() in ->direct_IO() all callers have iov_length(iter->iov, iter->nr_segs) == iov_iter_count(iter) Signed-off-by: Al Viro --- fs/nfs/direct.c | 10 +++------- 1 file changed, 3 insertions(+), 7 deletions(-) (limited to 'fs/nfs') diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c index 2172314..1d34f45 100644 --- a/fs/nfs/direct.c +++ b/fs/nfs/direct.c @@ -486,9 +486,7 @@ ssize_t nfs_file_direct_read(struct kiocb *iocb, struct iov_iter *iter, struct nfs_direct_req *dreq; struct nfs_lock_context *l_ctx; ssize_t result = -EINVAL; - size_t count; - - count = iov_length(iter->iov, iter->nr_segs); + size_t count = iov_iter_count(iter); nfs_add_stats(mapping->host, NFSIOS_DIRECTREADBYTES, count); dfprintk(FILE, "NFS: direct read(%pD2, %zd@%Ld)\n", @@ -877,7 +875,7 @@ 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(iter->iov, iter->nr_segs); + NFS_I(dreq->inode)->write_io += iov_iter_count(iter); 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); @@ -936,9 +934,7 @@ ssize_t nfs_file_direct_write(struct kiocb *iocb, struct iov_iter *iter, struct nfs_direct_req *dreq; struct nfs_lock_context *l_ctx; loff_t end; - size_t count; - - count = iov_length(iter->iov, iter->nr_segs); + size_t count = iov_iter_count(iter); end = (pos + count - 1) >> PAGE_CACHE_SHIFT; nfs_add_stats(mapping->host, NFSIOS_DIRECTWRITTENBYTES, count); -- cgit v1.1 From ed978a811ec528dbe40243605c3afab55892f722 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Wed, 5 Mar 2014 22:53:04 -0500 Subject: new helper: generic_file_read_iter() iov_iter-using variant of generic_file_aio_read(). Some callers converted. Note that it's still not quite there for use as ->read_iter() - we depend on having zero iter->iov_offset in O_DIRECT case. Fortunately, that's true for all converted callers (and for generic_file_aio_read() itself). Signed-off-by: Al Viro --- fs/nfs/file.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-) (limited to 'fs/nfs') diff --git a/fs/nfs/file.c b/fs/nfs/file.c index 3d01b15..a352bc6 100644 --- a/fs/nfs/file.c +++ b/fs/nfs/file.c @@ -184,7 +184,7 @@ nfs_file_read(struct kiocb *iocb, const struct iovec *iov, 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, &to); if (result > 0) nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, result); } -- cgit v1.1 From 71d8e532b1549a478e6a6a8a44f309d050294d00 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Wed, 5 Mar 2014 19:28:09 -0500 Subject: start adding the tag to iov_iter For now, just use the same thing we pass to ->direct_IO() - it's all iovec-based at the moment. Pass it explicitly to iov_iter_init() and account for kvec vs. iovec in there, by the same kludge NFS ->direct_IO() uses. Signed-off-by: Al Viro --- fs/nfs/file.c | 4 ++-- 1 file changed, 2 insertions(+), 2 deletions(-) (limited to 'fs/nfs') diff --git a/fs/nfs/file.c b/fs/nfs/file.c index a352bc6..ead8f44 100644 --- a/fs/nfs/file.c +++ b/fs/nfs/file.c @@ -173,7 +173,7 @@ nfs_file_read(struct kiocb *iocb, const struct iovec *iov, ssize_t result; struct iov_iter to; - iov_iter_init(&to, iov, nr_segs, count, 0); + iov_iter_init(&to, READ, iov, nr_segs, count); if (iocb->ki_filp->f_flags & O_DIRECT) return nfs_file_direct_read(iocb, &to, pos, true); @@ -648,7 +648,7 @@ ssize_t nfs_file_write(struct kiocb *iocb, const struct iovec *iov, ssize_t result; size_t count = iov_length(iov, nr_segs); struct iov_iter from; - iov_iter_init(&from, iov, nr_segs, count, 0); + iov_iter_init(&from, WRITE, iov, nr_segs, count); result = nfs_key_timeout_notify(file, inode); if (result) -- cgit v1.1 From 91f79c43d1b54d7154b118860d81b39bad07dfff Mon Sep 17 00:00:00 2001 From: Al Viro Date: Fri, 21 Mar 2014 04:58:33 -0400 Subject: new helper: iov_iter_get_pages_alloc() same as iov_iter_get_pages(), except that pages array is allocated (kmalloc if possible, vmalloc if that fails) and left for caller to free. Lustre and NFS ->direct_IO() switched to it. Signed-off-by: Al Viro --- fs/nfs/direct.c | 290 +++++++++++++++++--------------------------------------- 1 file changed, 88 insertions(+), 202 deletions(-) (limited to 'fs/nfs') diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c index 1d34f45..b122fe2 100644 --- a/fs/nfs/direct.c +++ b/fs/nfs/direct.c @@ -322,60 +322,37 @@ static const struct nfs_pgio_completion_ops nfs_direct_read_completion_ops = { * handled automatically by nfs_direct_read_result(). Otherwise, if * no requests have been sent, just return an error. */ -static ssize_t nfs_direct_read_schedule_segment(struct nfs_pageio_descriptor *desc, - const struct iovec *iov, - loff_t pos, bool uio) -{ - struct nfs_direct_req *dreq = desc->pg_dreq; - struct nfs_open_context *ctx = dreq->ctx; - struct inode *inode = ctx->dentry->d_inode; - unsigned long user_addr = (unsigned long)iov->iov_base; - size_t count = iov->iov_len; - size_t rsize = NFS_SERVER(inode)->rsize; - unsigned int pgbase; - int result; - ssize_t started = 0; - struct page **pagevec = NULL; - unsigned int npages; - - do { - size_t bytes; - int i; - pgbase = user_addr & ~PAGE_MASK; - bytes = min(max_t(size_t, rsize, PAGE_SIZE), count); +static ssize_t nfs_direct_read_schedule_iovec(struct nfs_direct_req *dreq, + struct iov_iter *iter, + loff_t pos) +{ + struct nfs_pageio_descriptor desc; + struct inode *inode = dreq->inode; + ssize_t result = -EINVAL; + size_t requested_bytes = 0; + size_t rsize = max_t(size_t, NFS_SERVER(inode)->rsize, PAGE_SIZE); - result = -ENOMEM; - npages = nfs_page_array_len(pgbase, bytes); - if (!pagevec) - pagevec = kmalloc(npages * sizeof(struct page *), - GFP_KERNEL); - if (!pagevec) - break; - if (uio) { - down_read(¤t->mm->mmap_sem); - result = get_user_pages(current, current->mm, user_addr, - npages, 1, 0, pagevec, NULL); - up_read(¤t->mm->mmap_sem); - if (result < 0) - break; - } else { - WARN_ON(npages != 1); - result = get_kernel_page(user_addr, 1, pagevec); - if (WARN_ON(result != 1)) - break; - } + NFS_PROTO(dreq->inode)->read_pageio_init(&desc, dreq->inode, + &nfs_direct_read_completion_ops); + get_dreq(dreq); + desc.pg_dreq = dreq; + atomic_inc(&inode->i_dio_count); - if ((unsigned)result < npages) { - bytes = result * PAGE_SIZE; - if (bytes <= pgbase) { - nfs_direct_release_pages(pagevec, result); - break; - } - bytes -= pgbase; - npages = result; - } + while (iov_iter_count(iter)) { + struct page **pagevec; + size_t bytes; + size_t pgbase; + unsigned npages, i; + result = iov_iter_get_pages_alloc(iter, &pagevec, + rsize, &pgbase); + if (result < 0) + break; + + bytes = result; + iov_iter_advance(iter, bytes); + npages = (result + pgbase + PAGE_SIZE - 1) / PAGE_SIZE; for (i = 0; i < npages; i++) { struct nfs_page *req; unsigned int req_len = min_t(size_t, bytes, PAGE_SIZE - pgbase); @@ -389,55 +366,21 @@ static ssize_t nfs_direct_read_schedule_segment(struct nfs_pageio_descriptor *de } req->wb_index = pos >> PAGE_SHIFT; req->wb_offset = pos & ~PAGE_MASK; - if (!nfs_pageio_add_request(desc, req)) { - result = desc->pg_error; + if (!nfs_pageio_add_request(&desc, req)) { + result = desc.pg_error; nfs_release_request(req); break; } pgbase = 0; bytes -= req_len; - started += req_len; - user_addr += req_len; + requested_bytes += req_len; pos += req_len; - count -= req_len; dreq->bytes_left -= req_len; } - /* The nfs_page now hold references to these pages */ nfs_direct_release_pages(pagevec, npages); - } while (count != 0 && result >= 0); - - kfree(pagevec); - - if (started) - return started; - return result < 0 ? (ssize_t) result : -EFAULT; -} - -static ssize_t nfs_direct_read_schedule_iovec(struct nfs_direct_req *dreq, - struct iov_iter *iter, - loff_t pos, bool uio) -{ - struct nfs_pageio_descriptor desc; - struct inode *inode = dreq->inode; - ssize_t result = -EINVAL; - size_t requested_bytes = 0; - unsigned long seg; - - NFS_PROTO(dreq->inode)->read_pageio_init(&desc, dreq->inode, - &nfs_direct_read_completion_ops); - get_dreq(dreq); - desc.pg_dreq = dreq; - atomic_inc(&inode->i_dio_count); - - 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); + kvfree(pagevec); if (result < 0) break; - requested_bytes += result; - if ((size_t)result < vec->iov_len) - break; - pos += vec->iov_len; } nfs_pageio_complete(&desc); @@ -521,7 +464,7 @@ ssize_t nfs_file_direct_read(struct kiocb *iocb, struct iov_iter *iter, dreq->iocb = iocb; NFS_I(inode)->read_io += count; - result = nfs_direct_read_schedule_iovec(dreq, iter, pos, uio); + result = nfs_direct_read_schedule_iovec(dreq, iter, pos); mutex_unlock(&inode->i_mutex); @@ -677,109 +620,6 @@ static void nfs_direct_write_complete(struct nfs_direct_req *dreq, struct inode } #endif -/* - * NB: Return the value of the first error return code. Subsequent - * errors after the first one are ignored. - */ -/* - * For each wsize'd chunk of the user's buffer, dispatch an NFS WRITE - * operation. If nfs_writedata_alloc() or get_user_pages() fails, - * bail and stop sending more writes. Write length accounting is - * handled automatically by nfs_direct_write_result(). Otherwise, if - * no requests have been sent, just return an error. - */ -static ssize_t nfs_direct_write_schedule_segment(struct nfs_pageio_descriptor *desc, - const struct iovec *iov, - loff_t pos, bool uio) -{ - struct nfs_direct_req *dreq = desc->pg_dreq; - struct nfs_open_context *ctx = dreq->ctx; - struct inode *inode = ctx->dentry->d_inode; - unsigned long user_addr = (unsigned long)iov->iov_base; - size_t count = iov->iov_len; - size_t wsize = NFS_SERVER(inode)->wsize; - unsigned int pgbase; - int result; - ssize_t started = 0; - struct page **pagevec = NULL; - unsigned int npages; - - do { - size_t bytes; - int i; - - pgbase = user_addr & ~PAGE_MASK; - bytes = min(max_t(size_t, wsize, PAGE_SIZE), count); - - result = -ENOMEM; - npages = nfs_page_array_len(pgbase, bytes); - if (!pagevec) - pagevec = kmalloc(npages * sizeof(struct page *), GFP_KERNEL); - if (!pagevec) - break; - - if (uio) { - down_read(¤t->mm->mmap_sem); - result = get_user_pages(current, current->mm, user_addr, - npages, 0, 0, pagevec, NULL); - up_read(¤t->mm->mmap_sem); - if (result < 0) - break; - } else { - WARN_ON(npages != 1); - result = get_kernel_page(user_addr, 0, pagevec); - if (WARN_ON(result != 1)) - break; - } - - if ((unsigned)result < npages) { - bytes = result * PAGE_SIZE; - if (bytes <= pgbase) { - nfs_direct_release_pages(pagevec, result); - break; - } - bytes -= pgbase; - npages = result; - } - - for (i = 0; i < npages; i++) { - struct nfs_page *req; - unsigned int req_len = min_t(size_t, bytes, PAGE_SIZE - pgbase); - - req = nfs_create_request(dreq->ctx, dreq->inode, - pagevec[i], - pgbase, 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; - } - pgbase = 0; - bytes -= req_len; - started += req_len; - user_addr += req_len; - pos += req_len; - count -= req_len; - dreq->bytes_left -= req_len; - } - /* The nfs_page now hold references to these pages */ - nfs_direct_release_pages(pagevec, npages); - } while (count != 0 && result >= 0); - - kfree(pagevec); - - if (started) - return started; - return result < 0 ? (ssize_t) result : -EFAULT; -} - static void nfs_direct_write_completion(struct nfs_pgio_header *hdr) { struct nfs_direct_req *dreq = hdr->dreq; @@ -859,15 +699,27 @@ static const struct nfs_pgio_completion_ops nfs_direct_write_completion_ops = { .completion = nfs_direct_write_completion, }; + +/* + * NB: Return the value of the first error return code. Subsequent + * errors after the first one are ignored. + */ +/* + * For each wsize'd chunk of the user's buffer, dispatch an NFS WRITE + * operation. If nfs_writedata_alloc() or get_user_pages() fails, + * bail and stop sending more writes. Write length accounting is + * handled automatically by nfs_direct_write_result(). Otherwise, if + * no requests have been sent, just return an error. + */ static ssize_t nfs_direct_write_schedule_iovec(struct nfs_direct_req *dreq, struct iov_iter *iter, - loff_t pos, bool uio) + loff_t pos) { struct nfs_pageio_descriptor desc; struct inode *inode = dreq->inode; ssize_t result = 0; size_t requested_bytes = 0; - unsigned long seg; + size_t wsize = max_t(size_t, NFS_SERVER(inode)->wsize, PAGE_SIZE); NFS_PROTO(inode)->write_pageio_init(&desc, inode, FLUSH_COND_STABLE, &nfs_direct_write_completion_ops); @@ -875,16 +727,50 @@ 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_iter_count(iter); - 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); + NFS_I(inode)->write_io += iov_iter_count(iter); + while (iov_iter_count(iter)) { + struct page **pagevec; + size_t bytes; + size_t pgbase; + unsigned npages, i; + + result = iov_iter_get_pages_alloc(iter, &pagevec, + wsize, &pgbase); if (result < 0) break; - requested_bytes += result; - if ((size_t)result < vec->iov_len) + + bytes = result; + iov_iter_advance(iter, bytes); + npages = (result + pgbase + PAGE_SIZE - 1) / PAGE_SIZE; + for (i = 0; i < npages; i++) { + struct nfs_page *req; + unsigned int req_len = min_t(size_t, bytes, PAGE_SIZE - pgbase); + + req = nfs_create_request(dreq->ctx, inode, + pagevec[i], + pgbase, 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; + } + pgbase = 0; + bytes -= req_len; + requested_bytes += req_len; + pos += req_len; + dreq->bytes_left -= req_len; + } + nfs_direct_release_pages(pagevec, npages); + kvfree(pagevec); + if (result < 0) break; - pos += vec->iov_len; } nfs_pageio_complete(&desc); @@ -985,7 +871,7 @@ ssize_t nfs_file_direct_write(struct kiocb *iocb, struct iov_iter *iter, if (!is_sync_kiocb(iocb)) dreq->iocb = iocb; - result = nfs_direct_write_schedule_iovec(dreq, iter, pos, uio); + result = nfs_direct_write_schedule_iovec(dreq, iter, pos); if (mapping->nrpages) { invalidate_inode_pages2_range(mapping, -- cgit v1.1 From 3aa2d199f8eb8149a88005e88736d583cbc39d31 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Wed, 2 Apr 2014 20:14:12 -0400 Subject: nfs: switch to ->read_iter() Signed-off-by: Al Viro --- fs/nfs/file.c | 17 ++++++----------- fs/nfs/internal.h | 2 +- fs/nfs/nfs4file.c | 4 ++-- 3 files changed, 9 insertions(+), 14 deletions(-) (limited to 'fs/nfs') diff --git a/fs/nfs/file.c b/fs/nfs/file.c index ead8f44..200bdb0 100644 --- a/fs/nfs/file.c +++ b/fs/nfs/file.c @@ -165,26 +165,21 @@ 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(struct kiocb *iocb, struct iov_iter *to) { 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, READ, iov, nr_segs, count); if (iocb->ki_filp->f_flags & O_DIRECT) - return nfs_file_direct_read(iocb, &to, pos, true); + return nfs_file_direct_read(iocb, to, iocb->ki_pos, true); dprintk("NFS: read(%pD2, %zu@%lu)\n", iocb->ki_filp, - count, (unsigned long) pos); + iov_iter_count(to), (unsigned long) iocb->ki_pos); result = nfs_revalidate_mapping(inode, iocb->ki_filp->f_mapping); if (!result) { - result = generic_file_read_iter(iocb, &to); + result = generic_file_read_iter(iocb, to); if (result > 0) nfs_add_stats(inode, NFSIOS_NORMALREADBYTES, result); } @@ -945,9 +940,9 @@ EXPORT_SYMBOL_GPL(nfs_setlease); const struct file_operations nfs_file_operations = { .llseek = nfs_file_llseek, - .read = do_sync_read, + .read = new_sync_read, .write = do_sync_write, - .aio_read = nfs_file_read, + .read_iter = nfs_file_read, .aio_write = nfs_file_write, .mmap = nfs_file_mmap, .open = nfs_file_open, diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h index dd8bfc2..e598e4a 100644 --- a/fs/nfs/internal.h +++ b/fs/nfs/internal.h @@ -320,7 +320,7 @@ int nfs_rename(struct inode *, struct dentry *, struct inode *, struct dentry *) 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(struct kiocb *, struct iov_iter *); 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 *); diff --git a/fs/nfs/nfs4file.c b/fs/nfs/nfs4file.c index 8de3407..37a998c 100644 --- a/fs/nfs/nfs4file.c +++ b/fs/nfs/nfs4file.c @@ -118,9 +118,9 @@ nfs4_file_fsync(struct file *file, loff_t start, loff_t end, int datasync) const struct file_operations nfs4_file_operations = { .llseek = nfs_file_llseek, - .read = do_sync_read, + .read = new_sync_read, .write = do_sync_write, - .aio_read = nfs_file_read, + .read_iter = nfs_file_read, .aio_write = nfs_file_write, .mmap = nfs_file_mmap, .open = nfs4_file_open, -- cgit v1.1 From edaf43694898c5d7deb9a394335c60e888039100 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Thu, 3 Apr 2014 14:07:25 -0400 Subject: nfs: switch to ->write_iter() Signed-off-by: Al Viro --- fs/nfs/file.c | 16 +++++++--------- fs/nfs/internal.h | 2 +- fs/nfs/nfs4file.c | 4 ++-- 3 files changed, 10 insertions(+), 12 deletions(-) (limited to 'fs/nfs') diff --git a/fs/nfs/file.c b/fs/nfs/file.c index 200bdb0..20a18e4 100644 --- a/fs/nfs/file.c +++ b/fs/nfs/file.c @@ -634,23 +634,21 @@ 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(struct kiocb *iocb, struct iov_iter *from) { struct file *file = iocb->ki_filp; struct inode *inode = file_inode(file); unsigned long written = 0; ssize_t result; - size_t count = iov_length(iov, nr_segs); - struct iov_iter from; - iov_iter_init(&from, WRITE, iov, nr_segs, count); + size_t count = iov_iter_count(from); + loff_t pos = iocb->ki_pos; result = nfs_key_timeout_notify(file, inode); if (result) return result; if (file->f_flags & O_DIRECT) - return nfs_file_direct_write(iocb, &from, pos, true); + return nfs_file_direct_write(iocb, from, pos, true); dprintk("NFS: write(%pD2, %zu@%Ld)\n", file, count, (long long) pos); @@ -671,7 +669,7 @@ 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, from); if (result > 0) written = result; @@ -941,9 +939,9 @@ EXPORT_SYMBOL_GPL(nfs_setlease); const struct file_operations nfs_file_operations = { .llseek = nfs_file_llseek, .read = new_sync_read, - .write = do_sync_write, + .write = new_sync_write, .read_iter = nfs_file_read, - .aio_write = nfs_file_write, + .write_iter = nfs_file_write, .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 e598e4a..a5b36fc 100644 --- a/fs/nfs/internal.h +++ b/fs/nfs/internal.h @@ -324,7 +324,7 @@ ssize_t nfs_file_read(struct kiocb *, struct iov_iter *); 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(struct kiocb *, struct iov_iter *); 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 37a998c..549dd49 100644 --- a/fs/nfs/nfs4file.c +++ b/fs/nfs/nfs4file.c @@ -119,9 +119,9 @@ nfs4_file_fsync(struct file *file, loff_t start, loff_t end, int datasync) const struct file_operations nfs4_file_operations = { .llseek = nfs_file_llseek, .read = new_sync_read, - .write = do_sync_write, + .write = new_sync_write, .read_iter = nfs_file_read, - .aio_write = nfs_file_write, + .write_iter = nfs_file_write, .mmap = nfs_file_mmap, .open = nfs4_file_open, .flush = nfs_file_flush, -- cgit v1.1 From 4da54c218da96fab0d65f3263c9b0092b42f0711 Mon Sep 17 00:00:00 2001 From: Al Viro Date: Sat, 5 Apr 2014 04:37:17 -0400 Subject: nfs: switch to iter_splice_write_file() Signed-off-by: Al Viro --- fs/nfs/file.c | 32 +------------------------------- fs/nfs/internal.h | 2 -- fs/nfs/nfs4file.c | 2 +- 3 files changed, 2 insertions(+), 34 deletions(-) (limited to 'fs/nfs') diff --git a/fs/nfs/file.c b/fs/nfs/file.c index 20a18e4..f4ae5d0 100644 --- a/fs/nfs/file.c +++ b/fs/nfs/file.c @@ -690,36 +690,6 @@ out_swapfile: } EXPORT_SYMBOL_GPL(nfs_file_write); -ssize_t nfs_file_splice_write(struct pipe_inode_info *pipe, - struct file *filp, loff_t *ppos, - size_t count, unsigned int flags) -{ - struct inode *inode = file_inode(filp); - unsigned long written = 0; - ssize_t ret; - - dprintk("NFS splice_write(%pD2, %lu@%llu)\n", - filp, (unsigned long) count, (unsigned long long) *ppos); - - /* - * The combination of splice and an O_APPEND destination is disallowed. - */ - - ret = generic_file_splice_write(pipe, filp, ppos, count, flags); - if (ret > 0) - written = ret; - - if (ret >= 0 && nfs_need_sync_write(filp, inode)) { - int err = vfs_fsync(filp, 0); - if (err < 0) - ret = err; - } - if (ret > 0) - nfs_add_stats(inode, NFSIOS_NORMALWRITTENBYTES, written); - return ret; -} -EXPORT_SYMBOL_GPL(nfs_file_splice_write); - static int do_getlk(struct file *filp, int cmd, struct file_lock *fl, int is_local) { @@ -950,7 +920,7 @@ const struct file_operations nfs_file_operations = { .lock = nfs_lock, .flock = nfs_flock, .splice_read = nfs_file_splice_read, - .splice_write = nfs_file_splice_write, + .splice_write = iter_file_splice_write, .check_flags = nfs_check_flags, .setlease = nfs_setlease, }; diff --git a/fs/nfs/internal.h b/fs/nfs/internal.h index a5b36fc..0e4e804 100644 --- a/fs/nfs/internal.h +++ b/fs/nfs/internal.h @@ -328,8 +328,6 @@ ssize_t nfs_file_write(struct kiocb *, struct iov_iter *); 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 *); -ssize_t nfs_file_splice_write(struct pipe_inode_info *, struct file *, loff_t *, - size_t, unsigned int); int nfs_check_flags(int); int nfs_setlease(struct file *, long, struct file_lock **); diff --git a/fs/nfs/nfs4file.c b/fs/nfs/nfs4file.c index 549dd49..50de2cd 100644 --- a/fs/nfs/nfs4file.c +++ b/fs/nfs/nfs4file.c @@ -130,7 +130,7 @@ const struct file_operations nfs4_file_operations = { .lock = nfs_lock, .flock = nfs_flock, .splice_read = nfs_file_splice_read, - .splice_write = nfs_file_splice_write, + .splice_write = iter_file_splice_write, .check_flags = nfs_check_flags, .setlease = nfs_setlease, }; -- cgit v1.1