[PATCH] Fix oops in NFS
From: David Howells <dhowells@redhat.com>
Date: 2023-12-22 12:01:02
Also in:
ceph-devel, linux-cifs, linux-fsdevel, linux-mm, linux-nfs, lkml, v9fs
Subsystem:
9p file system, afs filesystem, ceph distributed file system client (ceph), filesystems (vfs and infrastructure), filesystems [netfs library], nfs, sunrpc, and lockd clients, the rest · Maintainers:
Eric Van Hensbergen, Latchesar Ionkov, Dominique Martinet, David Howells, Marc Dionne, Ilya Dryomov, Alex Markuze, Viacheslav Dubeyko, Alexander Viro, Christian Brauner, Paulo Alcantara, Trond Myklebust, Anna Schumaker, Linus Torvalds
David Howells [off-list ref] wrote:
A better way, though, is to move the call to nfs_netfs_inode_init() and give it a flag to say whether or not we want the facility.
Okay, I think I'll fold in the attached change. David ---
diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index 55345753ae8d..b66466e97459 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c@@ -249,7 +249,7 @@ void v9fs_free_inode(struct inode *inode) static void v9fs_set_netfs_context(struct inode *inode) { struct v9fs_inode *v9inode = V9FS_I(inode); - netfs_inode_init(&v9inode->netfs, &v9fs_req_ops); + netfs_inode_init(&v9inode->netfs, &v9fs_req_ops, true); } int v9fs_init_inode(struct v9fs_session_info *v9ses,
diff --git a/fs/afs/dynroot.c b/fs/afs/dynroot.c
index 1f656005018e..9c517269ff95 100644
--- a/fs/afs/dynroot.c
+++ b/fs/afs/dynroot.c@@ -76,7 +76,7 @@ struct inode *afs_iget_pseudo_dir(struct super_block *sb, bool root) /* there shouldn't be an existing inode */ BUG_ON(!(inode->i_state & I_NEW)); - netfs_inode_init(&vnode->netfs, NULL); + netfs_inode_init(&vnode->netfs, NULL, false); inode->i_size = 0; inode->i_mode = S_IFDIR | S_IRUGO | S_IXUGO; if (root) {
diff --git a/fs/afs/inode.c b/fs/afs/inode.c
index 2b44a342b4a1..381521e9e118 100644
--- a/fs/afs/inode.c
+++ b/fs/afs/inode.c@@ -58,7 +58,7 @@ static noinline void dump_vnode(struct afs_vnode *vnode, struct afs_vnode *paren */ static void afs_set_netfs_context(struct afs_vnode *vnode) { - netfs_inode_init(&vnode->netfs, &afs_req_ops); + netfs_inode_init(&vnode->netfs, &afs_req_ops, true); } /*
diff --git a/fs/ceph/inode.c b/fs/ceph/inode.c
index 3149d79a9dbe..0c25d326afc4 100644
--- a/fs/ceph/inode.c
+++ b/fs/ceph/inode.c@@ -574,7 +574,7 @@ struct inode *ceph_alloc_inode(struct super_block *sb) doutc(fsc->client, "%p\n", &ci->netfs.inode); /* Set parameters for the netfs library */ - netfs_inode_init(&ci->netfs, &ceph_netfs_ops); + netfs_inode_init(&ci->netfs, &ceph_netfs_ops, false); spin_lock_init(&ci->i_ceph_lock);
diff --git a/fs/nfs/fscache.h b/fs/nfs/fscache.h
index 5407ab8c8783..e3cb4923316b 100644
--- a/fs/nfs/fscache.h
+++ b/fs/nfs/fscache.h@@ -80,7 +80,7 @@ static inline void nfs_netfs_put(struct nfs_netfs_io_data *netfs) } static inline void nfs_netfs_inode_init(struct nfs_inode *nfsi) { - netfs_inode_init(&nfsi->netfs, &nfs_netfs_ops); + netfs_inode_init(&nfsi->netfs, &nfs_netfs_ops, false); } extern void nfs_netfs_initiate_read(struct nfs_pgio_header *hdr); extern void nfs_netfs_read_completion(struct nfs_pgio_header *hdr);
diff --git a/include/linux/netfs.h b/include/linux/netfs.h
index a5374218efe4..06a03dd1aff1 100644
--- a/include/linux/netfs.h
+++ b/include/linux/netfs.h@@ -456,22 +456,27 @@ static inline struct netfs_inode *netfs_inode(struct inode *inode) * netfs_inode_init - Initialise a netfslib inode context * @ctx: The netfs inode to initialise * @ops: The netfs's operations list + * @use_zero_point: True to use the zero_point read optimisation * * Initialise the netfs library context struct. This is expected to follow on * directly from the VFS inode struct. */ static inline void netfs_inode_init(struct netfs_inode *ctx, - const struct netfs_request_ops *ops) + const struct netfs_request_ops *ops, + bool use_zero_point) { ctx->ops = ops; ctx->remote_i_size = i_size_read(&ctx->inode); - ctx->zero_point = ctx->remote_i_size; + ctx->zero_point = LLONG_MAX; ctx->flags = 0; #if IS_ENABLED(CONFIG_FSCACHE) ctx->cache = NULL; #endif /* ->releasepage() drives zero_point */ - mapping_set_release_always(ctx->inode.i_mapping); + if (use_zero_point) { + ctx->zero_point = ctx->remote_i_size; + mapping_set_release_always(ctx->inode.i_mapping); + } } /**