* Local function declarations
*/
static void nfs_redirty_request(struct nfs_page *req);
-static const struct rpc_call_ops nfs_write_common_ops;
static const struct rpc_call_ops nfs_commit_ops;
static const struct nfs_pgio_completion_ops nfs_async_write_completion_ops;
static const struct nfs_commit_completion_ops nfs_commit_completion_ops;
+static const struct nfs_rw_ops nfs_rw_write_ops;
+static void nfs_clear_request_commit(struct nfs_page *req);
static struct kmem_cache *nfs_wdata_cachep;
static mempool_t *nfs_wdata_mempool;
}
EXPORT_SYMBOL_GPL(nfs_commit_free);
-struct nfs_write_header *nfs_writehdr_alloc(void)
+static struct nfs_pgio_header *nfs_writehdr_alloc(void)
{
- struct nfs_write_header *p = mempool_alloc(nfs_wdata_mempool, GFP_NOIO);
-
- if (p) {
- struct nfs_pgio_header *hdr = &p->header;
+ struct nfs_pgio_header *p = mempool_alloc(nfs_wdata_mempool, GFP_NOIO);
+ if (p)
memset(p, 0, sizeof(*p));
- INIT_LIST_HEAD(&hdr->pages);
- INIT_LIST_HEAD(&hdr->rpc_list);
- spin_lock_init(&hdr->lock);
- atomic_set(&hdr->refcnt, 0);
- hdr->verf = &p->verf;
- }
return p;
}
-EXPORT_SYMBOL_GPL(nfs_writehdr_alloc);
-static struct nfs_write_data *nfs_writedata_alloc(struct nfs_pgio_header *hdr,
- unsigned int pagecount)
+static void nfs_writehdr_free(struct nfs_pgio_header *hdr)
{
- struct nfs_write_data *data, *prealloc;
-
- prealloc = &container_of(hdr, struct nfs_write_header, header)->rpc_data;
- if (prealloc->header == NULL)
- data = prealloc;
- else
- data = kzalloc(sizeof(*data), GFP_KERNEL);
- if (!data)
- goto out;
-
- if (nfs_pgarray_set(&data->pages, pagecount)) {
- data->header = hdr;
- atomic_inc(&hdr->refcnt);
- } else {
- if (data != prealloc)
- kfree(data);
- data = NULL;
- }
-out:
- return data;
+ mempool_free(hdr, nfs_wdata_mempool);
}
-void nfs_writehdr_free(struct nfs_pgio_header *hdr)
-{
- struct nfs_write_header *whdr = container_of(hdr, struct nfs_write_header, header);
- mempool_free(whdr, nfs_wdata_mempool);
-}
-EXPORT_SYMBOL_GPL(nfs_writehdr_free);
-
-void nfs_writedata_release(struct nfs_write_data *wdata)
-{
- struct nfs_pgio_header *hdr = wdata->header;
- struct nfs_write_header *write_header = container_of(hdr, struct nfs_write_header, header);
-
- put_nfs_open_context(wdata->args.context);
- if (wdata->pages.pagevec != wdata->pages.page_array)
- kfree(wdata->pages.pagevec);
- if (wdata == &write_header->rpc_data) {
- wdata->header = NULL;
- wdata = NULL;
- }
- if (atomic_dec_and_test(&hdr->refcnt))
- hdr->completion_ops->completion(hdr);
- /* Note: we only free the rpc_task after callbacks are done.
- * See the comment in rpc_free_task() for why
- */
- kfree(wdata);
-}
-EXPORT_SYMBOL_GPL(nfs_writedata_release);
-
static void nfs_context_set_write_error(struct nfs_open_context *ctx, int error)
{
ctx->error = error;
set_bit(NFS_CONTEXT_ERROR_WRITE, &ctx->flags);
}
+/*
+ * nfs_page_find_head_request_locked - find head request associated with @page
+ *
+ * must be called while holding the inode lock.
+ *
+ * returns matching head request with reference held, or NULL if not found.
+ */
static struct nfs_page *
-nfs_page_find_request_locked(struct nfs_inode *nfsi, struct page *page)
+nfs_page_find_head_request_locked(struct nfs_inode *nfsi, struct page *page)
{
struct nfs_page *req = NULL;
/* Linearly search the commit list for the correct req */
list_for_each_entry_safe(freq, t, &nfsi->commit_info.list, wb_list) {
if (freq->wb_page == page) {
- req = freq;
+ req = freq->wb_head;
break;
}
}
}
- if (req)
+ if (req) {
+ WARN_ON_ONCE(req->wb_head != req);
+
kref_get(&req->wb_kref);
+ }
return req;
}
-static struct nfs_page *nfs_page_find_request(struct page *page)
+/*
+ * nfs_page_find_head_request - find head request associated with @page
+ *
+ * returns matching head request with reference held, or NULL if not found.
+ */
+static struct nfs_page *nfs_page_find_head_request(struct page *page)
{
struct inode *inode = page_file_mapping(page)->host;
struct nfs_page *req = NULL;
spin_lock(&inode->i_lock);
- req = nfs_page_find_request_locked(NFS_I(inode), page);
+ req = nfs_page_find_head_request_locked(NFS_I(inode), page);
spin_unlock(&inode->i_lock);
return req;
}
nfs_zap_mapping(page_file_mapping(page)->host, page_file_mapping(page));
}
+/*
+ * nfs_page_group_search_locked
+ * @head - head request of page group
+ * @page_offset - offset into page
+ *
+ * Search page group with head @head to find a request that contains the
+ * page offset @page_offset.
+ *
+ * Returns a pointer to the first matching nfs request, or NULL if no
+ * match is found.
+ *
+ * Must be called with the page group lock held
+ */
+static struct nfs_page *
+nfs_page_group_search_locked(struct nfs_page *head, unsigned int page_offset)
+{
+ struct nfs_page *req;
+
+ WARN_ON_ONCE(head != head->wb_head);
+ WARN_ON_ONCE(!test_bit(PG_HEADLOCK, &head->wb_head->wb_flags));
+
+ req = head;
+ do {
+ if (page_offset >= req->wb_pgbase &&
+ page_offset < (req->wb_pgbase + req->wb_bytes))
+ return req;
+
+ req = req->wb_this_page;
+ } while (req != head);
+
+ return NULL;
+}
+
+/*
+ * nfs_page_group_covers_page
+ * @head - head request of page group
+ *
+ * Return true if the page group with head @head covers the whole page,
+ * returns false otherwise
+ */
+static bool nfs_page_group_covers_page(struct nfs_page *req)
+{
+ struct nfs_page *tmp;
+ unsigned int pos = 0;
+ unsigned int len = nfs_page_length(req->wb_page);
+
+ nfs_page_group_lock(req);
+
+ do {
+ tmp = nfs_page_group_search_locked(req->wb_head, pos);
+ if (tmp) {
+ /* no way this should happen */
+ WARN_ON_ONCE(tmp->wb_pgbase != pos);
+ pos += tmp->wb_bytes - (pos - tmp->wb_pgbase);
+ }
+ } while (tmp && pos < len);
+
+ nfs_page_group_unlock(req);
+ WARN_ON_ONCE(pos > len);
+ return pos == len;
+}
+
/* We can set the PG_uptodate flag if we see that a write request
* covers the full page.
*/
-static void nfs_mark_uptodate(struct page *page, unsigned int base, unsigned int count)
+static void nfs_mark_uptodate(struct nfs_page *req)
{
- if (PageUptodate(page))
- return;
- if (base != 0)
+ if (PageUptodate(req->wb_page))
return;
- if (count != nfs_page_length(page))
+ if (!nfs_page_group_covers_page(req))
return;
- SetPageUptodate(page);
+ SetPageUptodate(req->wb_page);
}
static int wb_priority(struct writeback_control *wbc)
}
}
-static void nfs_end_page_writeback(struct page *page)
+static void nfs_end_page_writeback(struct nfs_page *req)
{
- struct inode *inode = page_file_mapping(page)->host;
+ struct inode *inode = page_file_mapping(req->wb_page)->host;
struct nfs_server *nfss = NFS_SERVER(inode);
- end_page_writeback(page);
+ if (!nfs_page_group_sync_on_bit(req, PG_WB_END))
+ return;
+
+ end_page_writeback(req->wb_page);
if (atomic_long_dec_return(&nfss->writeback) < NFS_CONGESTION_OFF_THRESH)
clear_bdi_congested(&nfss->backing_dev_info, BLK_RW_ASYNC);
}
-static struct nfs_page *nfs_find_and_lock_request(struct page *page, bool nonblock)
+
+/* nfs_page_group_clear_bits
+ * @req - an nfs request
+ * clears all page group related bits from @req
+ */
+static void
+nfs_page_group_clear_bits(struct nfs_page *req)
+{
+ clear_bit(PG_TEARDOWN, &req->wb_flags);
+ clear_bit(PG_UNLOCKPAGE, &req->wb_flags);
+ clear_bit(PG_UPTODATE, &req->wb_flags);
+ clear_bit(PG_WB_END, &req->wb_flags);
+ clear_bit(PG_REMOVE, &req->wb_flags);
+}
+
+
+/*
+ * nfs_unroll_locks_and_wait - unlock all newly locked reqs and wait on @req
+ *
+ * this is a helper function for nfs_lock_and_join_requests
+ *
+ * @inode - inode associated with request page group, must be holding inode lock
+ * @head - head request of page group, must be holding head lock
+ * @req - request that couldn't lock and needs to wait on the req bit lock
+ * @nonblock - if true, don't actually wait
+ *
+ * NOTE: this must be called holding page_group bit lock and inode spin lock
+ * and BOTH will be released before returning.
+ *
+ * returns 0 on success, < 0 on error.
+ */
+static int
+nfs_unroll_locks_and_wait(struct inode *inode, struct nfs_page *head,
+ struct nfs_page *req, bool nonblock)
+ __releases(&inode->i_lock)
+{
+ struct nfs_page *tmp;
+ int ret;
+
+ /* relinquish all the locks successfully grabbed this run */
+ for (tmp = head ; tmp != req; tmp = tmp->wb_this_page)
+ nfs_unlock_request(tmp);
+
+ WARN_ON_ONCE(test_bit(PG_TEARDOWN, &req->wb_flags));
+
+ /* grab a ref on the request that will be waited on */
+ kref_get(&req->wb_kref);
+
+ nfs_page_group_unlock(head);
+ spin_unlock(&inode->i_lock);
+
+ /* release ref from nfs_page_find_head_request_locked */
+ nfs_release_request(head);
+
+ if (!nonblock)
+ ret = nfs_wait_on_request(req);
+ else
+ ret = -EAGAIN;
+ nfs_release_request(req);
+
+ return ret;
+}
+
+/*
+ * nfs_destroy_unlinked_subrequests - destroy recently unlinked subrequests
+ *
+ * @destroy_list - request list (using wb_this_page) terminated by @old_head
+ * @old_head - the old head of the list
+ *
+ * All subrequests must be locked and removed from all lists, so at this point
+ * they are only "active" in this function, and possibly in nfs_wait_on_request
+ * with a reference held by some other context.
+ */
+static void
+nfs_destroy_unlinked_subrequests(struct nfs_page *destroy_list,
+ struct nfs_page *old_head)
+{
+ while (destroy_list) {
+ struct nfs_page *subreq = destroy_list;
+
+ destroy_list = (subreq->wb_this_page == old_head) ?
+ NULL : subreq->wb_this_page;
+
+ WARN_ON_ONCE(old_head != subreq->wb_head);
+
+ /* make sure old group is not used */
+ subreq->wb_head = subreq;
+ subreq->wb_this_page = subreq;
+
+ nfs_clear_request_commit(subreq);
+
+ /* subreq is now totally disconnected from page group or any
+ * write / commit lists. last chance to wake any waiters */
+ nfs_unlock_request(subreq);
+
+ if (!test_bit(PG_TEARDOWN, &subreq->wb_flags)) {
+ /* release ref on old head request */
+ nfs_release_request(old_head);
+
+ nfs_page_group_clear_bits(subreq);
+
+ /* release the PG_INODE_REF reference */
+ if (test_and_clear_bit(PG_INODE_REF, &subreq->wb_flags))
+ nfs_release_request(subreq);
+ else
+ WARN_ON_ONCE(1);
+ } else {
+ WARN_ON_ONCE(test_bit(PG_CLEAN, &subreq->wb_flags));
+ /* zombie requests have already released the last
+ * reference and were waiting on the rest of the
+ * group to complete. Since it's no longer part of a
+ * group, simply free the request */
+ nfs_page_group_clear_bits(subreq);
+ nfs_free_request(subreq);
+ }
+ }
+}
+
+/*
+ * nfs_lock_and_join_requests - join all subreqs to the head req and return
+ * a locked reference, cancelling any pending
+ * operations for this page.
+ *
+ * @page - the page used to lookup the "page group" of nfs_page structures
+ * @nonblock - if true, don't block waiting for request locks
+ *
+ * This function joins all sub requests to the head request by first
+ * locking all requests in the group, cancelling any pending operations
+ * and finally updating the head request to cover the whole range covered by
+ * the (former) group. All subrequests are removed from any write or commit
+ * lists, unlinked from the group and destroyed.
+ *
+ * Returns a locked, referenced pointer to the head request - which after
+ * this call is guaranteed to be the only request associated with the page.
+ * Returns NULL if no requests are found for @page, or a ERR_PTR if an
+ * error was encountered.
+ */
+static struct nfs_page *
+nfs_lock_and_join_requests(struct page *page, bool nonblock)
{
struct inode *inode = page_file_mapping(page)->host;
- struct nfs_page *req;
+ struct nfs_page *head, *subreq;
+ struct nfs_page *destroy_list = NULL;
+ unsigned int total_bytes;
int ret;
+try_again:
+ total_bytes = 0;
+
+ WARN_ON_ONCE(destroy_list);
+
spin_lock(&inode->i_lock);
- for (;;) {
- req = nfs_page_find_request_locked(NFS_I(inode), page);
- if (req == NULL)
- break;
- if (nfs_lock_request(req))
- break;
- /* Note: If we hold the page lock, as is the case in nfs_writepage,
- * then the call to nfs_lock_request() will always
- * succeed provided that someone hasn't already marked the
- * request as dirty (in which case we don't care).
- */
+
+ /*
+ * A reference is taken only on the head request which acts as a
+ * reference to the whole page group - the group will not be destroyed
+ * until the head reference is released.
+ */
+ head = nfs_page_find_head_request_locked(NFS_I(inode), page);
+
+ if (!head) {
spin_unlock(&inode->i_lock);
- if (!nonblock)
- ret = nfs_wait_on_request(req);
- else
- ret = -EAGAIN;
- nfs_release_request(req);
- if (ret != 0)
+ return NULL;
+ }
+
+ /* lock each request in the page group */
+ nfs_page_group_lock(head);
+ subreq = head;
+ do {
+ /*
+ * Subrequests are always contiguous, non overlapping
+ * and in order. If not, it's a programming error.
+ */
+ WARN_ON_ONCE(subreq->wb_offset !=
+ (head->wb_offset + total_bytes));
+
+ /* keep track of how many bytes this group covers */
+ total_bytes += subreq->wb_bytes;
+
+ if (!nfs_lock_request(subreq)) {
+ /* releases page group bit lock and
+ * inode spin lock and all references */
+ ret = nfs_unroll_locks_and_wait(inode, head,
+ subreq, nonblock);
+
+ if (ret == 0)
+ goto try_again;
+
return ERR_PTR(ret);
- spin_lock(&inode->i_lock);
+ }
+
+ subreq = subreq->wb_this_page;
+ } while (subreq != head);
+
+ /* Now that all requests are locked, make sure they aren't on any list.
+ * Commit list removal accounting is done after locks are dropped */
+ subreq = head;
+ do {
+ nfs_list_remove_request(subreq);
+ subreq = subreq->wb_this_page;
+ } while (subreq != head);
+
+ /* unlink subrequests from head, destroy them later */
+ if (head->wb_this_page != head) {
+ /* destroy list will be terminated by head */
+ destroy_list = head->wb_this_page;
+ head->wb_this_page = head;
+
+ /* change head request to cover whole range that
+ * the former page group covered */
+ head->wb_bytes = total_bytes;
}
+
+ /*
+ * prepare head request to be added to new pgio descriptor
+ */
+ nfs_page_group_clear_bits(head);
+
+ /*
+ * some part of the group was still on the inode list - otherwise
+ * the group wouldn't be involved in async write.
+ * grab a reference for the head request, iff it needs one.
+ */
+ if (!test_and_set_bit(PG_INODE_REF, &head->wb_flags))
+ kref_get(&head->wb_kref);
+
+ nfs_page_group_unlock(head);
+
+ /* drop lock to clear_request_commit the head req and clean up
+ * requests on destroy list */
spin_unlock(&inode->i_lock);
- return req;
+
+ nfs_destroy_unlinked_subrequests(destroy_list, head);
+
+ /* clean up commit list state */
+ nfs_clear_request_commit(head);
+
+ /* still holds ref on head from nfs_page_find_head_request_locked
+ * and still has lock on head from lock loop */
+ return head;
}
/*
struct nfs_page *req;
int ret = 0;
- req = nfs_find_and_lock_request(page, nonblock);
+ req = nfs_lock_and_join_requests(page, nonblock);
if (!req)
goto out;
ret = PTR_ERR(req);
struct nfs_pageio_descriptor pgio;
int err;
- NFS_PROTO(page_file_mapping(page)->host)->write_pageio_init(&pgio,
- page->mapping->host,
- wb_priority(wbc),
- &nfs_async_write_completion_ops);
+ nfs_pageio_init_write(&pgio, page->mapping->host, wb_priority(wbc),
+ false, &nfs_async_write_completion_ops);
err = nfs_do_writepage(page, wbc, &pgio);
nfs_pageio_complete(&pgio);
if (err < 0)
nfs_inc_stats(inode, NFSIOS_VFSWRITEPAGES);
- NFS_PROTO(inode)->write_pageio_init(&pgio, inode, wb_priority(wbc), &nfs_async_write_completion_ops);
+ nfs_pageio_init_write(&pgio, inode, wb_priority(wbc), false,
+ &nfs_async_write_completion_ops);
err = write_cache_pages(mapping, wbc, nfs_writepages_callback, &pgio);
nfs_pageio_complete(&pgio);
{
struct nfs_inode *nfsi = NFS_I(inode);
+ WARN_ON_ONCE(req->wb_this_page != req);
+
/* Lock the request! */
nfs_lock_request(req);
set_page_private(req->wb_page, (unsigned long)req);
}
nfsi->npages++;
+ /* this a head request for a page group - mark it as having an
+ * extra reference so sub groups can follow suit */
+ WARN_ON(test_and_set_bit(PG_INODE_REF, &req->wb_flags));
kref_get(&req->wb_kref);
spin_unlock(&inode->i_lock);
}
{
struct inode *inode = req->wb_context->dentry->d_inode;
struct nfs_inode *nfsi = NFS_I(inode);
+ struct nfs_page *head;
- spin_lock(&inode->i_lock);
- if (likely(!PageSwapCache(req->wb_page))) {
- set_page_private(req->wb_page, 0);
- ClearPagePrivate(req->wb_page);
- clear_bit(PG_MAPPED, &req->wb_flags);
+ if (nfs_page_group_sync_on_bit(req, PG_REMOVE)) {
+ head = req->wb_head;
+
+ spin_lock(&inode->i_lock);
+ if (likely(!PageSwapCache(head->wb_page))) {
+ set_page_private(head->wb_page, 0);
+ ClearPagePrivate(head->wb_page);
+ clear_bit(PG_MAPPED, &head->wb_flags);
+ }
+ nfsi->npages--;
+ spin_unlock(&inode->i_lock);
}
- nfsi->npages--;
- spin_unlock(&inode->i_lock);
- nfs_release_request(req);
+
+ if (test_and_clear_bit(PG_INODE_REF, &req->wb_flags))
+ nfs_release_request(req);
}
static void
}
}
-static inline
-int nfs_write_need_commit(struct nfs_write_data *data)
+int nfs_write_need_commit(struct nfs_pgio_header *hdr)
{
- if (data->verf.committed == NFS_DATA_SYNC)
- return data->header->lseg == NULL;
- return data->verf.committed != NFS_FILE_SYNC;
+ if (hdr->verf.committed == NFS_DATA_SYNC)
+ return hdr->lseg == NULL;
+ return hdr->verf.committed != NFS_FILE_SYNC;
}
#else
{
}
-static inline
-int nfs_write_need_commit(struct nfs_write_data *data)
+int nfs_write_need_commit(struct nfs_pgio_header *hdr)
{
return 0;
}
nfs_context_set_write_error(req->wb_context, hdr->error);
goto remove_req;
}
- if (test_bit(NFS_IOHDR_NEED_RESCHED, &hdr->flags)) {
- nfs_mark_request_dirty(req);
- goto next;
- }
- if (test_bit(NFS_IOHDR_NEED_COMMIT, &hdr->flags)) {
- memcpy(&req->wb_verf, &hdr->verf->verifier, sizeof(req->wb_verf));
+ if (nfs_write_need_commit(hdr)) {
+ memcpy(&req->wb_verf, &hdr->verf.verifier, sizeof(req->wb_verf));
nfs_mark_request_commit(req, hdr->lseg, &cinfo);
goto next;
}
nfs_inode_remove_request(req);
next:
nfs_unlock_request(req);
- nfs_end_page_writeback(req->wb_page);
+ nfs_end_page_writeback(req);
nfs_release_request(req);
}
out:
}
#if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(CONFIG_NFS_V4)
-static unsigned long
+unsigned long
nfs_reqs_to_commit(struct nfs_commit_info *cinfo)
{
return cinfo->mds->ncommit;
}
#else
-static unsigned long nfs_reqs_to_commit(struct nfs_commit_info *cinfo)
+unsigned long nfs_reqs_to_commit(struct nfs_commit_info *cinfo)
{
return 0;
}
spin_lock(&inode->i_lock);
for (;;) {
- req = nfs_page_find_request_locked(NFS_I(inode), page);
+ req = nfs_page_find_head_request_locked(NFS_I(inode), page);
if (req == NULL)
goto out_unlock;
+ /* should be handled by nfs_flush_incompatible */
+ WARN_ON_ONCE(req->wb_head != req);
+ WARN_ON_ONCE(req->wb_this_page != req);
+
rqend = req->wb_offset + req->wb_bytes;
/*
* Tell the caller to flush out the request if
req = nfs_try_to_update_request(inode, page, offset, bytes);
if (req != NULL)
goto out;
- req = nfs_create_request(ctx, inode, page, offset, bytes);
+ req = nfs_create_request(ctx, page, NULL, offset, bytes);
if (IS_ERR(req))
goto out;
nfs_inode_add_request(inode, req);
return PTR_ERR(req);
/* Update file length */
nfs_grow_file(page, offset, count);
- nfs_mark_uptodate(page, req->wb_pgbase, req->wb_bytes);
+ nfs_mark_uptodate(req);
nfs_mark_request_dirty(req);
nfs_unlock_and_release_request(req);
return 0;
* dropped page.
*/
do {
- req = nfs_page_find_request(page);
+ req = nfs_page_find_head_request(page);
if (req == NULL)
return 0;
l_ctx = req->wb_lock_context;
do_flush = req->wb_page != page || req->wb_context != ctx;
+ /* for now, flush if more than 1 request in page_group */
+ do_flush |= req->wb_this_page != req;
if (l_ctx && ctx->dentry->d_inode->i_flock != NULL) {
do_flush |= l_ctx->lockowner.l_owner != current->files
|| l_ctx->lockowner.l_pid != current->tgid;
if (nfs_have_delegated_attributes(inode))
goto out;
- if (nfsi->cache_validity & (NFS_INO_INVALID_DATA|NFS_INO_REVAL_PAGECACHE))
+ if (nfsi->cache_validity & NFS_INO_REVAL_PAGECACHE)
return false;
smp_rmb();
if (test_bit(NFS_INO_INVALIDATING, &nfsi->flags))
return false;
out:
+ if (nfsi->cache_validity & NFS_INO_INVALID_DATA)
+ return false;
return PageUptodate(page) != 0;
}
return RPC_PRIORITY_NORMAL;
}
-int nfs_initiate_write(struct rpc_clnt *clnt,
- struct nfs_write_data *data,
- const struct rpc_call_ops *call_ops,
- int how, int flags)
+static void nfs_initiate_write(struct nfs_pgio_header *hdr,
+ struct rpc_message *msg,
+ struct rpc_task_setup *task_setup_data, int how)
{
- struct inode *inode = data->header->inode;
+ struct inode *inode = hdr->inode;
int priority = flush_task_priority(how);
- struct rpc_task *task;
- struct rpc_message msg = {
- .rpc_argp = &data->args,
- .rpc_resp = &data->res,
- .rpc_cred = data->header->cred,
- };
- struct rpc_task_setup task_setup_data = {
- .rpc_client = clnt,
- .task = &data->task,
- .rpc_message = &msg,
- .callback_ops = call_ops,
- .callback_data = data,
- .workqueue = nfsiod_workqueue,
- .flags = RPC_TASK_ASYNC | flags,
- .priority = priority,
- };
- int ret = 0;
- /* Set up the initial task struct. */
- NFS_PROTO(inode)->write_setup(data, &msg);
-
- dprintk("NFS: %5u initiated write call "
- "(req %s/%llu, %u bytes @ offset %llu)\n",
- data->task.tk_pid,
- inode->i_sb->s_id,
- (unsigned long long)NFS_FILEID(inode),
- data->args.count,
- (unsigned long long)data->args.offset);
+ task_setup_data->priority = priority;
+ NFS_PROTO(inode)->write_setup(hdr, msg);
nfs4_state_protect_write(NFS_SERVER(inode)->nfs_client,
- &task_setup_data.rpc_client, &msg, data);
-
- task = rpc_run_task(&task_setup_data);
- if (IS_ERR(task)) {
- ret = PTR_ERR(task);
- goto out;
- }
- if (how & FLUSH_SYNC) {
- ret = rpc_wait_for_completion_task(task);
- if (ret == 0)
- ret = task->tk_status;
- }
- rpc_put_task(task);
-out:
- return ret;
-}
-EXPORT_SYMBOL_GPL(nfs_initiate_write);
-
-/*
- * Set up the argument/result storage required for the RPC call.
- */
-static void nfs_write_rpcsetup(struct nfs_write_data *data,
- unsigned int count, unsigned int offset,
- int how, struct nfs_commit_info *cinfo)
-{
- struct nfs_page *req = data->header->req;
-
- /* Set up the RPC argument and reply structs
- * NB: take care not to mess about with data->commit et al. */
-
- data->args.fh = NFS_FH(data->header->inode);
- data->args.offset = req_offset(req) + offset;
- /* pnfs_set_layoutcommit needs this */
- data->mds_offset = data->args.offset;
- data->args.pgbase = req->wb_pgbase + offset;
- data->args.pages = data->pages.pagevec;
- data->args.count = count;
- data->args.context = get_nfs_open_context(req->wb_context);
- data->args.lock_context = req->wb_lock_context;
- data->args.stable = NFS_UNSTABLE;
- switch (how & (FLUSH_STABLE | FLUSH_COND_STABLE)) {
- case 0:
- break;
- case FLUSH_COND_STABLE:
- if (nfs_reqs_to_commit(cinfo))
- break;
- default:
- data->args.stable = NFS_FILE_SYNC;
- }
-
- data->res.fattr = &data->fattr;
- data->res.count = count;
- data->res.verf = &data->verf;
- nfs_fattr_init(&data->fattr);
-}
-
-static int nfs_do_write(struct nfs_write_data *data,
- const struct rpc_call_ops *call_ops,
- int how)
-{
- struct inode *inode = data->header->inode;
-
- return nfs_initiate_write(NFS_CLIENT(inode), data, call_ops, how, 0);
-}
-
-static int nfs_do_multiple_writes(struct list_head *head,
- const struct rpc_call_ops *call_ops,
- int how)
-{
- struct nfs_write_data *data;
- int ret = 0;
-
- while (!list_empty(head)) {
- int ret2;
-
- data = list_first_entry(head, struct nfs_write_data, list);
- list_del_init(&data->list);
-
- ret2 = nfs_do_write(data, call_ops, how);
- if (ret == 0)
- ret = ret2;
- }
- return ret;
+ &task_setup_data->rpc_client, msg, hdr);
}
/* If a nfs_flush_* function fails, it should remove reqs from @head and
{
nfs_mark_request_dirty(req);
nfs_unlock_request(req);
- nfs_end_page_writeback(req->wb_page);
+ nfs_end_page_writeback(req);
nfs_release_request(req);
}
.completion = nfs_write_completion,
};
-static void nfs_flush_error(struct nfs_pageio_descriptor *desc,
- struct nfs_pgio_header *hdr)
-{
- set_bit(NFS_IOHDR_REDO, &hdr->flags);
- while (!list_empty(&hdr->rpc_list)) {
- struct nfs_write_data *data = list_first_entry(&hdr->rpc_list,
- struct nfs_write_data, list);
- list_del(&data->list);
- nfs_writedata_release(data);
- }
- desc->pg_completion_ops->error_cleanup(&desc->pg_list);
-}
-
-/*
- * Generate multiple small requests to write out a single
- * contiguous dirty area on one page.
- */
-static int nfs_flush_multi(struct nfs_pageio_descriptor *desc,
- struct nfs_pgio_header *hdr)
-{
- struct nfs_page *req = hdr->req;
- struct page *page = req->wb_page;
- struct nfs_write_data *data;
- size_t wsize = desc->pg_bsize, nbytes;
- unsigned int offset;
- int requests = 0;
- struct nfs_commit_info cinfo;
-
- nfs_init_cinfo(&cinfo, desc->pg_inode, desc->pg_dreq);
-
- if ((desc->pg_ioflags & FLUSH_COND_STABLE) &&
- (desc->pg_moreio || nfs_reqs_to_commit(&cinfo) ||
- desc->pg_count > wsize))
- desc->pg_ioflags &= ~FLUSH_COND_STABLE;
-
-
- offset = 0;
- nbytes = desc->pg_count;
- do {
- size_t len = min(nbytes, wsize);
-
- data = nfs_writedata_alloc(hdr, 1);
- if (!data) {
- nfs_flush_error(desc, hdr);
- return -ENOMEM;
- }
- data->pages.pagevec[0] = page;
- nfs_write_rpcsetup(data, len, offset, desc->pg_ioflags, &cinfo);
- list_add(&data->list, &hdr->rpc_list);
- requests++;
- nbytes -= len;
- offset += len;
- } while (nbytes != 0);
- nfs_list_remove_request(req);
- nfs_list_add_request(req, &hdr->pages);
- desc->pg_rpc_callops = &nfs_write_common_ops;
- return 0;
-}
-
-/*
- * Create an RPC task for the given write request and kick it.
- * The page must have been locked by the caller.
- *
- * It may happen that the page we're passed is not marked dirty.
- * This is the case if nfs_updatepage detects a conflicting request
- * that has been written but not committed.
- */
-static int nfs_flush_one(struct nfs_pageio_descriptor *desc,
- struct nfs_pgio_header *hdr)
-{
- struct nfs_page *req;
- struct page **pages;
- struct nfs_write_data *data;
- struct list_head *head = &desc->pg_list;
- struct nfs_commit_info cinfo;
-
- data = nfs_writedata_alloc(hdr, nfs_page_array_len(desc->pg_base,
- desc->pg_count));
- if (!data) {
- nfs_flush_error(desc, hdr);
- return -ENOMEM;
- }
-
- nfs_init_cinfo(&cinfo, desc->pg_inode, desc->pg_dreq);
- pages = data->pages.pagevec;
- while (!list_empty(head)) {
- req = nfs_list_entry(head->next);
- nfs_list_remove_request(req);
- nfs_list_add_request(req, &hdr->pages);
- *pages++ = req->wb_page;
- }
-
- if ((desc->pg_ioflags & FLUSH_COND_STABLE) &&
- (desc->pg_moreio || nfs_reqs_to_commit(&cinfo)))
- desc->pg_ioflags &= ~FLUSH_COND_STABLE;
-
- /* Set up the argument struct */
- nfs_write_rpcsetup(data, desc->pg_count, 0, desc->pg_ioflags, &cinfo);
- list_add(&data->list, &hdr->rpc_list);
- desc->pg_rpc_callops = &nfs_write_common_ops;
- return 0;
-}
-
-int nfs_generic_flush(struct nfs_pageio_descriptor *desc,
- struct nfs_pgio_header *hdr)
-{
- if (desc->pg_bsize < PAGE_CACHE_SIZE)
- return nfs_flush_multi(desc, hdr);
- return nfs_flush_one(desc, hdr);
-}
-EXPORT_SYMBOL_GPL(nfs_generic_flush);
-
-static int nfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
-{
- struct nfs_write_header *whdr;
- struct nfs_pgio_header *hdr;
- int ret;
-
- whdr = nfs_writehdr_alloc();
- if (!whdr) {
- desc->pg_completion_ops->error_cleanup(&desc->pg_list);
- return -ENOMEM;
- }
- hdr = &whdr->header;
- nfs_pgheader_init(desc, hdr, nfs_writehdr_free);
- atomic_inc(&hdr->refcnt);
- ret = nfs_generic_flush(desc, hdr);
- if (ret == 0)
- ret = nfs_do_multiple_writes(&hdr->rpc_list,
- desc->pg_rpc_callops,
- desc->pg_ioflags);
- if (atomic_dec_and_test(&hdr->refcnt))
- hdr->completion_ops->completion(hdr);
- return ret;
-}
-
-static const struct nfs_pageio_ops nfs_pageio_write_ops = {
- .pg_test = nfs_generic_pg_test,
- .pg_doio = nfs_generic_pg_writepages,
-};
-
void nfs_pageio_init_write(struct nfs_pageio_descriptor *pgio,
- struct inode *inode, int ioflags,
+ struct inode *inode, int ioflags, bool force_mds,
const struct nfs_pgio_completion_ops *compl_ops)
{
- nfs_pageio_init(pgio, inode, &nfs_pageio_write_ops, compl_ops,
- NFS_SERVER(inode)->wsize, ioflags);
+ struct nfs_server *server = NFS_SERVER(inode);
+ const struct nfs_pageio_ops *pg_ops = &nfs_pgio_rw_ops;
+
+#ifdef CONFIG_NFS_V4_1
+ if (server->pnfs_curr_ld && !force_mds)
+ pg_ops = server->pnfs_curr_ld->pg_write_ops;
+#endif
+ nfs_pageio_init(pgio, inode, pg_ops, compl_ops, &nfs_rw_write_ops,
+ server->wsize, ioflags);
}
EXPORT_SYMBOL_GPL(nfs_pageio_init_write);
void nfs_pageio_reset_write_mds(struct nfs_pageio_descriptor *pgio)
{
- pgio->pg_ops = &nfs_pageio_write_ops;
+ pgio->pg_ops = &nfs_pgio_rw_ops;
pgio->pg_bsize = NFS_SERVER(pgio->pg_inode)->wsize;
}
EXPORT_SYMBOL_GPL(nfs_pageio_reset_write_mds);
-void nfs_write_prepare(struct rpc_task *task, void *calldata)
-{
- struct nfs_write_data *data = calldata;
- int err;
- err = NFS_PROTO(data->header->inode)->write_rpc_prepare(task, data);
- if (err)
- rpc_exit(task, err);
-}
-
void nfs_commit_prepare(struct rpc_task *task, void *calldata)
{
struct nfs_commit_data *data = calldata;
NFS_PROTO(data->inode)->commit_rpc_prepare(task, data);
}
-/*
- * Handle a write reply that flushes a whole page.
- *
- * FIXME: There is an inherent race with invalidate_inode_pages and
- * writebacks since the page->count is kept > 1 for as long
- * as the page has a write request pending.
- */
-static void nfs_writeback_done_common(struct rpc_task *task, void *calldata)
+static void nfs_writeback_release_common(struct nfs_pgio_header *hdr)
{
- struct nfs_write_data *data = calldata;
-
- nfs_writeback_done(task, data);
+ /* do nothing! */
}
-static void nfs_writeback_release_common(void *calldata)
+/*
+ * Special version of should_remove_suid() that ignores capabilities.
+ */
+static int nfs_should_remove_suid(const struct inode *inode)
{
- struct nfs_write_data *data = calldata;
- struct nfs_pgio_header *hdr = data->header;
- int status = data->task.tk_status;
+ umode_t mode = inode->i_mode;
+ int kill = 0;
- if ((status >= 0) && nfs_write_need_commit(data)) {
- spin_lock(&hdr->lock);
- if (test_bit(NFS_IOHDR_NEED_RESCHED, &hdr->flags))
- ; /* Do nothing */
- else if (!test_and_set_bit(NFS_IOHDR_NEED_COMMIT, &hdr->flags))
- memcpy(hdr->verf, &data->verf, sizeof(*hdr->verf));
- else if (memcmp(hdr->verf, &data->verf, sizeof(*hdr->verf)))
- set_bit(NFS_IOHDR_NEED_RESCHED, &hdr->flags);
- spin_unlock(&hdr->lock);
- }
- nfs_writedata_release(data);
-}
+ /* suid always must be killed */
+ if (unlikely(mode & S_ISUID))
+ kill = ATTR_KILL_SUID;
-static const struct rpc_call_ops nfs_write_common_ops = {
- .rpc_call_prepare = nfs_write_prepare,
- .rpc_call_done = nfs_writeback_done_common,
- .rpc_release = nfs_writeback_release_common,
-};
+ /*
+ * sgid without any exec bits is just a mandatory locking mark; leave
+ * it alone. If some exec bits are set, it's a real sgid; kill it.
+ */
+ if (unlikely((mode & S_ISGID) && (mode & S_IXGRP)))
+ kill |= ATTR_KILL_SGID;
+ if (unlikely(kill && S_ISREG(mode)))
+ return kill;
+
+ return 0;
+}
/*
* This function is called when the WRITE call is complete.
*/
-void nfs_writeback_done(struct rpc_task *task, struct nfs_write_data *data)
+static int nfs_writeback_done(struct rpc_task *task,
+ struct nfs_pgio_header *hdr,
+ struct inode *inode)
{
- struct nfs_writeargs *argp = &data->args;
- struct nfs_writeres *resp = &data->res;
- struct inode *inode = data->header->inode;
int status;
- dprintk("NFS: %5u nfs_writeback_done (status %d)\n",
- task->tk_pid, task->tk_status);
-
/*
* ->write_done will attempt to use post-op attributes to detect
* conflicting writes by other clients. A strict interpretation
* another writer had changed the file, but some applications
* depend on tighter cache coherency when writing.
*/
- status = NFS_PROTO(inode)->write_done(task, data);
+ status = NFS_PROTO(inode)->write_done(task, hdr);
if (status != 0)
- return;
- nfs_add_stats(inode, NFSIOS_SERVERWRITTENBYTES, resp->count);
+ return status;
+ nfs_add_stats(inode, NFSIOS_SERVERWRITTENBYTES, hdr->res.count);
#if IS_ENABLED(CONFIG_NFS_V3) || IS_ENABLED(CONFIG_NFS_V4)
- if (resp->verf->committed < argp->stable && task->tk_status >= 0) {
+ if (hdr->res.verf->committed < hdr->args.stable &&
+ task->tk_status >= 0) {
/* We tried a write call, but the server did not
* commit data to stable storage even though we
* requested it.
dprintk("NFS: faulty NFS server %s:"
" (committed = %d) != (stable = %d)\n",
NFS_SERVER(inode)->nfs_client->cl_hostname,
- resp->verf->committed, argp->stable);
+ hdr->res.verf->committed, hdr->args.stable);
complain = jiffies + 300 * HZ;
}
}
#endif
- if (task->tk_status < 0)
- nfs_set_pgio_error(data->header, task->tk_status, argp->offset);
- else if (resp->count < argp->count) {
+
+ /* Deal with the suid/sgid bit corner case */
+ if (nfs_should_remove_suid(inode))
+ nfs_mark_for_revalidate(inode);
+ return 0;
+}
+
+/*
+ * This function is called when the WRITE call is complete.
+ */
+static void nfs_writeback_result(struct rpc_task *task,
+ struct nfs_pgio_header *hdr)
+{
+ struct nfs_pgio_args *argp = &hdr->args;
+ struct nfs_pgio_res *resp = &hdr->res;
+
+ if (resp->count < argp->count) {
static unsigned long complain;
/* This a short write! */
- nfs_inc_stats(inode, NFSIOS_SHORTWRITE);
+ nfs_inc_stats(hdr->inode, NFSIOS_SHORTWRITE);
/* Has the server at least made some progress? */
if (resp->count == 0) {
argp->count);
complain = jiffies + 300 * HZ;
}
- nfs_set_pgio_error(data->header, -EIO, argp->offset);
+ nfs_set_pgio_error(hdr, -EIO, argp->offset);
task->tk_status = -EIO;
return;
}
/* Was this an NFSv2 write or an NFSv3 stable write? */
if (resp->verf->committed != NFS_UNSTABLE) {
/* Resend from where the server left off */
- data->mds_offset += resp->count;
+ hdr->mds_offset += resp->count;
argp->offset += resp->count;
argp->pgbase += resp->count;
argp->count -= resp->count;
struct nfs_page *req;
int ret = 0;
- for (;;) {
- wait_on_page_writeback(page);
- req = nfs_page_find_request(page);
- if (req == NULL)
- break;
- if (nfs_lock_request(req)) {
- nfs_clear_request_commit(req);
- nfs_inode_remove_request(req);
- /*
- * In case nfs_inode_remove_request has marked the
- * page as being dirty
- */
- cancel_dirty_page(page, PAGE_CACHE_SIZE);
- nfs_unlock_and_release_request(req);
- break;
- }
- ret = nfs_wait_on_request(req);
- nfs_release_request(req);
- if (ret < 0)
- break;
+ wait_on_page_writeback(page);
+
+ /* blocking call to cancel all requests and join to a single (head)
+ * request */
+ req = nfs_lock_and_join_requests(page, false);
+
+ if (IS_ERR(req)) {
+ ret = PTR_ERR(req);
+ } else if (req) {
+ /* all requests from this page have been cancelled by
+ * nfs_lock_and_join_requests, so just remove the head
+ * request from the inode / page_private pointer and
+ * release it */
+ nfs_inode_remove_request(req);
+ /*
+ * In case nfs_inode_remove_request has marked the
+ * page as being dirty
+ */
+ cancel_dirty_page(page, PAGE_CACHE_SIZE);
+ nfs_unlock_and_release_request(req);
}
+
return ret;
}
int __init nfs_init_writepagecache(void)
{
nfs_wdata_cachep = kmem_cache_create("nfs_write_data",
- sizeof(struct nfs_write_header),
+ sizeof(struct nfs_pgio_header),
0, SLAB_HWCACHE_ALIGN,
NULL);
if (nfs_wdata_cachep == NULL)
kmem_cache_destroy(nfs_wdata_cachep);
}
+static const struct nfs_rw_ops nfs_rw_write_ops = {
+ .rw_mode = FMODE_WRITE,
+ .rw_alloc_header = nfs_writehdr_alloc,
+ .rw_free_header = nfs_writehdr_free,
+ .rw_release = nfs_writeback_release_common,
+ .rw_done = nfs_writeback_done,
+ .rw_result = nfs_writeback_result,
+ .rw_initiate = nfs_initiate_write,
+};
projects / karo-tx-linux.git / blobdiff