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-rw-r--r--fs/netfs/output.c478
1 files changed, 0 insertions, 478 deletions
diff --git a/fs/netfs/output.c b/fs/netfs/output.c
deleted file mode 100644
index 625eb68f3e5a..000000000000
--- a/fs/netfs/output.c
+++ /dev/null
@@ -1,478 +0,0 @@
-// SPDX-License-Identifier: GPL-2.0-only
-/* Network filesystem high-level write support.
- *
- * Copyright (C) 2023 Red Hat, Inc. All Rights Reserved.
- * Written by David Howells (dhowells@redhat.com)
- */
-
-#include <linux/fs.h>
-#include <linux/mm.h>
-#include <linux/pagemap.h>
-#include <linux/slab.h>
-#include <linux/writeback.h>
-#include <linux/pagevec.h>
-#include "internal.h"
-
-/**
- * netfs_create_write_request - Create a write operation.
- * @wreq: The write request this is storing from.
- * @dest: The destination type
- * @start: Start of the region this write will modify
- * @len: Length of the modification
- * @worker: The worker function to handle the write(s)
- *
- * Allocate a write operation, set it up and add it to the list on a write
- * request.
- */
-struct netfs_io_subrequest *netfs_create_write_request(struct netfs_io_request *wreq,
- enum netfs_io_source dest,
- loff_t start, size_t len,
- work_func_t worker)
-{
- struct netfs_io_subrequest *subreq;
-
- subreq = netfs_alloc_subrequest(wreq);
- if (subreq) {
- INIT_WORK(&subreq->work, worker);
- subreq->source = dest;
- subreq->start = start;
- subreq->len = len;
- subreq->debug_index = wreq->subreq_counter++;
-
- switch (subreq->source) {
- case NETFS_UPLOAD_TO_SERVER:
- netfs_stat(&netfs_n_wh_upload);
- break;
- case NETFS_WRITE_TO_CACHE:
- netfs_stat(&netfs_n_wh_write);
- break;
- default:
- BUG();
- }
-
- subreq->io_iter = wreq->io_iter;
- iov_iter_advance(&subreq->io_iter, subreq->start - wreq->start);
- iov_iter_truncate(&subreq->io_iter, subreq->len);
-
- trace_netfs_sreq_ref(wreq->debug_id, subreq->debug_index,
- refcount_read(&subreq->ref),
- netfs_sreq_trace_new);
- atomic_inc(&wreq->nr_outstanding);
- list_add_tail(&subreq->rreq_link, &wreq->subrequests);
- trace_netfs_sreq(subreq, netfs_sreq_trace_prepare);
- }
-
- return subreq;
-}
-EXPORT_SYMBOL(netfs_create_write_request);
-
-/*
- * Process a completed write request once all the component operations have
- * been completed.
- */
-static void netfs_write_terminated(struct netfs_io_request *wreq, bool was_async)
-{
- struct netfs_io_subrequest *subreq;
- struct netfs_inode *ctx = netfs_inode(wreq->inode);
- size_t transferred = 0;
-
- _enter("R=%x[]", wreq->debug_id);
-
- trace_netfs_rreq(wreq, netfs_rreq_trace_write_done);
-
- list_for_each_entry(subreq, &wreq->subrequests, rreq_link) {
- if (subreq->error || subreq->transferred == 0)
- break;
- transferred += subreq->transferred;
- if (subreq->transferred < subreq->len)
- break;
- }
- wreq->transferred = transferred;
-
- list_for_each_entry(subreq, &wreq->subrequests, rreq_link) {
- if (!subreq->error)
- continue;
- switch (subreq->source) {
- case NETFS_UPLOAD_TO_SERVER:
- /* Depending on the type of failure, this may prevent
- * writeback completion unless we're in disconnected
- * mode.
- */
- if (!wreq->error)
- wreq->error = subreq->error;
- break;
-
- case NETFS_WRITE_TO_CACHE:
- /* Failure doesn't prevent writeback completion unless
- * we're in disconnected mode.
- */
- if (subreq->error != -ENOBUFS)
- ctx->ops->invalidate_cache(wreq);
- break;
-
- default:
- WARN_ON_ONCE(1);
- if (!wreq->error)
- wreq->error = -EIO;
- return;
- }
- }
-
- wreq->cleanup(wreq);
-
- if (wreq->origin == NETFS_DIO_WRITE &&
- wreq->mapping->nrpages) {
- pgoff_t first = wreq->start >> PAGE_SHIFT;
- pgoff_t last = (wreq->start + wreq->transferred - 1) >> PAGE_SHIFT;
- invalidate_inode_pages2_range(wreq->mapping, first, last);
- }
-
- if (wreq->origin == NETFS_DIO_WRITE)
- inode_dio_end(wreq->inode);
-
- _debug("finished");
- trace_netfs_rreq(wreq, netfs_rreq_trace_wake_ip);
- clear_bit_unlock(NETFS_RREQ_IN_PROGRESS, &wreq->flags);
- wake_up_bit(&wreq->flags, NETFS_RREQ_IN_PROGRESS);
-
- if (wreq->iocb) {
- wreq->iocb->ki_pos += transferred;
- if (wreq->iocb->ki_complete)
- wreq->iocb->ki_complete(
- wreq->iocb, wreq->error ? wreq->error : transferred);
- }
-
- netfs_clear_subrequests(wreq, was_async);
- netfs_put_request(wreq, was_async, netfs_rreq_trace_put_complete);
-}
-
-/*
- * Deal with the completion of writing the data to the cache.
- */
-void netfs_write_subrequest_terminated(void *_op, ssize_t transferred_or_error,
- bool was_async)
-{
- struct netfs_io_subrequest *subreq = _op;
- struct netfs_io_request *wreq = subreq->rreq;
- unsigned int u;
-
- _enter("%x[%x] %zd", wreq->debug_id, subreq->debug_index, transferred_or_error);
-
- switch (subreq->source) {
- case NETFS_UPLOAD_TO_SERVER:
- netfs_stat(&netfs_n_wh_upload_done);
- break;
- case NETFS_WRITE_TO_CACHE:
- netfs_stat(&netfs_n_wh_write_done);
- break;
- case NETFS_INVALID_WRITE:
- break;
- default:
- BUG();
- }
-
- if (IS_ERR_VALUE(transferred_or_error)) {
- subreq->error = transferred_or_error;
- trace_netfs_failure(wreq, subreq, transferred_or_error,
- netfs_fail_write);
- goto failed;
- }
-
- if (WARN(transferred_or_error > subreq->len - subreq->transferred,
- "Subreq excess write: R%x[%x] %zd > %zu - %zu",
- wreq->debug_id, subreq->debug_index,
- transferred_or_error, subreq->len, subreq->transferred))
- transferred_or_error = subreq->len - subreq->transferred;
-
- subreq->error = 0;
- subreq->transferred += transferred_or_error;
-
- if (iov_iter_count(&subreq->io_iter) != subreq->len - subreq->transferred)
- pr_warn("R=%08x[%u] ITER POST-MISMATCH %zx != %zx-%zx %x\n",
- wreq->debug_id, subreq->debug_index,
- iov_iter_count(&subreq->io_iter), subreq->len,
- subreq->transferred, subreq->io_iter.iter_type);
-
- if (subreq->transferred < subreq->len)
- goto incomplete;
-
- __clear_bit(NETFS_SREQ_NO_PROGRESS, &subreq->flags);
-out:
- trace_netfs_sreq(subreq, netfs_sreq_trace_terminated);
-
- /* If we decrement nr_outstanding to 0, the ref belongs to us. */
- u = atomic_dec_return(&wreq->nr_outstanding);
- if (u == 0)
- netfs_write_terminated(wreq, was_async);
- else if (u == 1)
- wake_up_var(&wreq->nr_outstanding);
-
- netfs_put_subrequest(subreq, was_async, netfs_sreq_trace_put_terminated);
- return;
-
-incomplete:
- if (transferred_or_error == 0) {
- if (__test_and_set_bit(NETFS_SREQ_NO_PROGRESS, &subreq->flags)) {
- subreq->error = -ENODATA;
- goto failed;
- }
- } else {
- __clear_bit(NETFS_SREQ_NO_PROGRESS, &subreq->flags);
- }
-
- __set_bit(NETFS_SREQ_SHORT_IO, &subreq->flags);
- set_bit(NETFS_RREQ_INCOMPLETE_IO, &wreq->flags);
- goto out;
-
-failed:
- switch (subreq->source) {
- case NETFS_WRITE_TO_CACHE:
- netfs_stat(&netfs_n_wh_write_failed);
- set_bit(NETFS_RREQ_INCOMPLETE_IO, &wreq->flags);
- break;
- case NETFS_UPLOAD_TO_SERVER:
- netfs_stat(&netfs_n_wh_upload_failed);
- set_bit(NETFS_RREQ_FAILED, &wreq->flags);
- wreq->error = subreq->error;
- break;
- default:
- break;
- }
- goto out;
-}
-EXPORT_SYMBOL(netfs_write_subrequest_terminated);
-
-static void netfs_write_to_cache_op(struct netfs_io_subrequest *subreq)
-{
- struct netfs_io_request *wreq = subreq->rreq;
- struct netfs_cache_resources *cres = &wreq->cache_resources;
-
- trace_netfs_sreq(subreq, netfs_sreq_trace_submit);
-
- cres->ops->write(cres, subreq->start, &subreq->io_iter,
- netfs_write_subrequest_terminated, subreq);
-}
-
-static void netfs_write_to_cache_op_worker(struct work_struct *work)
-{
- struct netfs_io_subrequest *subreq =
- container_of(work, struct netfs_io_subrequest, work);
-
- netfs_write_to_cache_op(subreq);
-}
-
-/**
- * netfs_queue_write_request - Queue a write request for attention
- * @subreq: The write request to be queued
- *
- * Queue the specified write request for processing by a worker thread. We
- * pass the caller's ref on the request to the worker thread.
- */
-void netfs_queue_write_request(struct netfs_io_subrequest *subreq)
-{
- if (!queue_work(system_unbound_wq, &subreq->work))
- netfs_put_subrequest(subreq, false, netfs_sreq_trace_put_wip);
-}
-EXPORT_SYMBOL(netfs_queue_write_request);
-
-/*
- * Set up a op for writing to the cache.
- */
-static void netfs_set_up_write_to_cache(struct netfs_io_request *wreq)
-{
- struct netfs_cache_resources *cres = &wreq->cache_resources;
- struct netfs_io_subrequest *subreq;
- struct netfs_inode *ctx = netfs_inode(wreq->inode);
- struct fscache_cookie *cookie = netfs_i_cookie(ctx);
- loff_t start = wreq->start;
- size_t len = wreq->len;
- int ret;
-
- if (!fscache_cookie_enabled(cookie)) {
- clear_bit(NETFS_RREQ_WRITE_TO_CACHE, &wreq->flags);
- return;
- }
-
- _debug("write to cache");
- ret = fscache_begin_write_operation(cres, cookie);
- if (ret < 0)
- return;
-
- ret = cres->ops->prepare_write(cres, &start, &len, wreq->upper_len,
- i_size_read(wreq->inode), true);
- if (ret < 0)
- return;
-
- subreq = netfs_create_write_request(wreq, NETFS_WRITE_TO_CACHE, start, len,
- netfs_write_to_cache_op_worker);
- if (!subreq)
- return;
-
- netfs_write_to_cache_op(subreq);
-}
-
-/*
- * Begin the process of writing out a chunk of data.
- *
- * We are given a write request that holds a series of dirty regions and
- * (partially) covers a sequence of folios, all of which are present. The
- * pages must have been marked as writeback as appropriate.
- *
- * We need to perform the following steps:
- *
- * (1) If encrypting, create an output buffer and encrypt each block of the
- * data into it, otherwise the output buffer will point to the original
- * folios.
- *
- * (2) If the data is to be cached, set up a write op for the entire output
- * buffer to the cache, if the cache wants to accept it.
- *
- * (3) If the data is to be uploaded (ie. not merely cached):
- *
- * (a) If the data is to be compressed, create a compression buffer and
- * compress the data into it.
- *
- * (b) For each destination we want to upload to, set up write ops to write
- * to that destination. We may need multiple writes if the data is not
- * contiguous or the span exceeds wsize for a server.
- */
-int netfs_begin_write(struct netfs_io_request *wreq, bool may_wait,
- enum netfs_write_trace what)
-{
- struct netfs_inode *ctx = netfs_inode(wreq->inode);
-
- _enter("R=%x %llx-%llx f=%lx",
- wreq->debug_id, wreq->start, wreq->start + wreq->len - 1,
- wreq->flags);
-
- trace_netfs_write(wreq, what);
- if (wreq->len == 0 || wreq->iter.count == 0) {
- pr_err("Zero-sized write [R=%x]\n", wreq->debug_id);
- return -EIO;
- }
-
- if (wreq->origin == NETFS_DIO_WRITE)
- inode_dio_begin(wreq->inode);
-
- wreq->io_iter = wreq->iter;
-
- /* ->outstanding > 0 carries a ref */
- netfs_get_request(wreq, netfs_rreq_trace_get_for_outstanding);
- atomic_set(&wreq->nr_outstanding, 1);
-
- /* Start the encryption/compression going. We can do that in the
- * background whilst we generate a list of write ops that we want to
- * perform.
- */
- // TODO: Encrypt or compress the region as appropriate
-
- /* We need to write all of the region to the cache */
- if (test_bit(NETFS_RREQ_WRITE_TO_CACHE, &wreq->flags))
- netfs_set_up_write_to_cache(wreq);
-
- /* However, we don't necessarily write all of the region to the server.
- * Caching of reads is being managed this way also.
- */
- if (test_bit(NETFS_RREQ_UPLOAD_TO_SERVER, &wreq->flags))
- ctx->ops->create_write_requests(wreq, wreq->start, wreq->len);
-
- if (atomic_dec_and_test(&wreq->nr_outstanding))
- netfs_write_terminated(wreq, false);
-
- if (!may_wait)
- return -EIOCBQUEUED;
-
- wait_on_bit(&wreq->flags, NETFS_RREQ_IN_PROGRESS,
- TASK_UNINTERRUPTIBLE);
- return wreq->error;
-}
-
-/*
- * Begin a write operation for writing through the pagecache.
- */
-struct netfs_io_request *netfs_begin_writethrough(struct kiocb *iocb, size_t len)
-{
- struct netfs_io_request *wreq;
- struct file *file = iocb->ki_filp;
-
- wreq = netfs_alloc_request(file->f_mapping, file, iocb->ki_pos, len,
- NETFS_WRITETHROUGH);
- if (IS_ERR(wreq))
- return wreq;
-
- trace_netfs_write(wreq, netfs_write_trace_writethrough);
-
- __set_bit(NETFS_RREQ_UPLOAD_TO_SERVER, &wreq->flags);
- iov_iter_xarray(&wreq->iter, ITER_SOURCE, &wreq->mapping->i_pages, wreq->start, 0);
- wreq->io_iter = wreq->iter;
-
- /* ->outstanding > 0 carries a ref */
- netfs_get_request(wreq, netfs_rreq_trace_get_for_outstanding);
- atomic_set(&wreq->nr_outstanding, 1);
- return wreq;
-}
-
-static void netfs_submit_writethrough(struct netfs_io_request *wreq, bool final)
-{
- struct netfs_inode *ictx = netfs_inode(wreq->inode);
- unsigned long long start;
- size_t len;
-
- if (!test_bit(NETFS_RREQ_UPLOAD_TO_SERVER, &wreq->flags))
- return;
-
- start = wreq->start + wreq->submitted;
- len = wreq->iter.count - wreq->submitted;
- if (!final) {
- len /= wreq->wsize; /* Round to number of maximum packets */
- len *= wreq->wsize;
- }
-
- ictx->ops->create_write_requests(wreq, start, len);
- wreq->submitted += len;
-}
-
-/*
- * Advance the state of the write operation used when writing through the
- * pagecache. Data has been copied into the pagecache that we need to append
- * to the request. If we've added more than wsize then we need to create a new
- * subrequest.
- */
-int netfs_advance_writethrough(struct netfs_io_request *wreq, size_t copied, bool to_page_end)
-{
- _enter("ic=%zu sb=%zu ws=%u cp=%zu tp=%u",
- wreq->iter.count, wreq->submitted, wreq->wsize, copied, to_page_end);
-
- wreq->iter.count += copied;
- wreq->io_iter.count += copied;
- if (to_page_end && wreq->io_iter.count - wreq->submitted >= wreq->wsize)
- netfs_submit_writethrough(wreq, false);
-
- return wreq->error;
-}
-
-/*
- * End a write operation used when writing through the pagecache.
- */
-int netfs_end_writethrough(struct netfs_io_request *wreq, struct kiocb *iocb)
-{
- int ret = -EIOCBQUEUED;
-
- _enter("ic=%zu sb=%zu ws=%u",
- wreq->iter.count, wreq->submitted, wreq->wsize);
-
- if (wreq->submitted < wreq->io_iter.count)
- netfs_submit_writethrough(wreq, true);
-
- if (atomic_dec_and_test(&wreq->nr_outstanding))
- netfs_write_terminated(wreq, false);
-
- if (is_sync_kiocb(iocb)) {
- wait_on_bit(&wreq->flags, NETFS_RREQ_IN_PROGRESS,
- TASK_UNINTERRUPTIBLE);
- ret = wreq->error;
- }
-
- netfs_put_request(wreq, false, netfs_rreq_trace_put_return);
- return ret;
-}
generated by cgit v1.2.3 (git 2.25.1) at 2024-06-20 06:12:47 +0000