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Fri, 25 Oct 2024 20:43:29 +0000 (UTC) Received: from warthog.procyon.org.uk.com (unknown [10.42.28.231]) by mx-prod-int-04.mail-002.prod.us-west-2.aws.redhat.com (Postfix) with ESMTP id 7BAD2196BB7D; Fri, 25 Oct 2024 20:43:24 +0000 (UTC) From: David Howells To: Christian Brauner , Steve French , Matthew Wilcox Cc: David Howells , Jeff Layton , Gao Xiang , Dominique Martinet , Marc Dionne , Paulo Alcantara , Shyam Prasad N , Tom Talpey , Eric Van Hensbergen , Ilya Dryomov , netfs@lists.linux.dev, linux-afs@lists.infradead.org, linux-cifs@vger.kernel.org, linux-nfs@vger.kernel.org, ceph-devel@vger.kernel.org, v9fs@lists.linux.dev, linux-erofs@lists.ozlabs.org, linux-fsdevel@vger.kernel.org, linux-mm@kvack.org, netdev@vger.kernel.org, linux-kernel@vger.kernel.org Subject: [PATCH v2 29/31] afs: Locally initialise the contents of a new symlink on creation Date: Fri, 25 Oct 2024 21:39:56 +0100 Message-ID: <20241025204008.4076565-30-dhowells@redhat.com> In-Reply-To: <20241025204008.4076565-1-dhowells@redhat.com> References: <20241025204008.4076565-1-dhowells@redhat.com> Precedence: bulk X-Mailing-List: linux-cifs@vger.kernel.org List-Id: List-Subscribe: List-Unsubscribe: MIME-Version: 1.0 X-Scanned-By: MIMEDefang 3.0 on 10.30.177.40 Since we know what the contents of a symlink will be when we create it on the server, initialise its contents locally too to avoid the need to download it. Signed-off-by: David Howells cc: Marc Dionne cc: linux-afs@lists.infradead.org --- fs/afs/dir.c | 2 ++ fs/afs/inode.c | 44 ++++++++++++++++++++++++++++++++++------ fs/afs/internal.h | 1 + fs/netfs/buffered_read.c | 2 +- fs/netfs/read_single.c | 2 +- 5 files changed, 43 insertions(+), 8 deletions(-) diff --git a/fs/afs/dir.c b/fs/afs/dir.c index 6a4fc1cffb7e..663a212964d8 100644 --- a/fs/afs/dir.c +++ b/fs/afs/dir.c @@ -1270,6 +1270,8 @@ static void afs_vnode_new_inode(struct afs_operation *op) set_bit(AFS_VNODE_NEW_CONTENT, &vnode->flags); if (S_ISDIR(inode->i_mode)) afs_mkdir_init_dir(vnode, dvp->vnode); + else if (S_ISLNK(inode->i_mode)) + afs_init_new_symlink(vnode, op); if (!afs_op_error(op)) afs_cache_permit(vnode, op->key, vnode->cb_break, &vp->scb); d_instantiate(op->dentry, inode); diff --git a/fs/afs/inode.c b/fs/afs/inode.c index c3b720fda525..f5618564b3fc 100644 --- a/fs/afs/inode.c +++ b/fs/afs/inode.c @@ -25,6 +25,23 @@ #include "internal.h" #include "afs_fs.h" +void afs_init_new_symlink(struct afs_vnode *vnode, struct afs_operation *op) +{ + size_t size = strlen(op->create.symlink) + 1; + size_t dsize = 0; + char *p; + + if (netfs_alloc_folioq_buffer(NULL, &vnode->directory, &dsize, size, + mapping_gfp_mask(vnode->netfs.inode.i_mapping)) < 0) + return; + + vnode->directory_size = dsize; + p = kmap_local_folio(folioq_folio(vnode->directory, 0), 0); + memcpy(p, op->create.symlink, size); + kunmap_local(p); + netfs_single_mark_inode_dirty(&vnode->netfs.inode); +} + static void afs_put_link(void *arg) { struct folio *folio = virt_to_folio(arg); @@ -41,15 +58,30 @@ const char *afs_get_link(struct dentry *dentry, struct inode *inode, char *content; ssize_t ret; - if (atomic64_read(&vnode->cb_expires_at) == AFS_NO_CB_PROMISE || - !vnode->directory) { - if (!dentry) + if (!dentry) { + /* RCU pathwalk. */ + if (!vnode->directory || !afs_check_validity(vnode)) return ERR_PTR(-ECHILD); - ret = afs_read_single(vnode, NULL); - if (ret < 0) - return ERR_PTR(ret); + goto good; } + if (!vnode->directory) + goto fetch; + + ret = afs_validate(vnode, NULL); + if (ret < 0) + return ERR_PTR(ret); + + if (!test_and_clear_bit(AFS_VNODE_ZAP_DATA, &vnode->flags) && + vnode->directory) + goto good; + +fetch: + ret = afs_read_single(vnode, NULL); + if (ret < 0) + return ERR_PTR(ret); + +good: folio = folioq_folio(vnode->directory, 0); folio_get(folio); content = kmap_local_folio(folio, 0); diff --git a/fs/afs/internal.h b/fs/afs/internal.h index 0737d729f4e6..b11b2dfb8380 100644 --- a/fs/afs/internal.h +++ b/fs/afs/internal.h @@ -1216,6 +1216,7 @@ extern void afs_fs_probe_cleanup(struct afs_net *); */ extern const struct afs_operation_ops afs_fetch_status_operation; +void afs_init_new_symlink(struct afs_vnode *vnode, struct afs_operation *op); const char *afs_get_link(struct dentry *dentry, struct inode *inode, struct delayed_call *callback); int afs_readlink(struct dentry *dentry, char __user *buffer, int buflen); diff --git a/fs/netfs/buffered_read.c b/fs/netfs/buffered_read.c index 7036e9f12b07..65d9dd71f65d 100644 --- a/fs/netfs/buffered_read.c +++ b/fs/netfs/buffered_read.c @@ -210,7 +210,7 @@ static void netfs_read_to_pagecache(struct netfs_io_request *rreq) do { struct netfs_io_subrequest *subreq; - enum netfs_io_source source = NETFS_DOWNLOAD_FROM_SERVER; + enum netfs_io_source source = NETFS_SOURCE_UNKNOWN; ssize_t slice; subreq = netfs_alloc_subrequest(rreq); diff --git a/fs/netfs/read_single.c b/fs/netfs/read_single.c index 14bc61107182..fea0ecdecc53 100644 --- a/fs/netfs/read_single.c +++ b/fs/netfs/read_single.c @@ -97,7 +97,7 @@ static int netfs_single_dispatch_read(struct netfs_io_request *rreq) if (!subreq) return -ENOMEM; - subreq->source = NETFS_DOWNLOAD_FROM_SERVER; + subreq->source = NETFS_SOURCE_UNKNOWN; subreq->start = 0; subreq->len = rreq->len; subreq->io_iter = rreq->buffer.iter;