9p: Fix initialisation of netfs_inode for 9p

[ Upstream commit 9546ac78b232bac56ff975072b1965e0e755ebd4 ]

The 9p filesystem is calling netfs_inode_init() in v9fs_init_inode() -
before the struct inode fields have been initialised from the obtained file
stats (ie. after v9fs_stat2inode*() has been called), but netfslib wants to
set a couple of its fields from i_size.

Reported-by: Marc Dionne <marc.dionne@auristor.com>
Signed-off-by: David Howells <dhowells@redhat.com>
Tested-by: Marc Dionne <marc.dionne@auristor.com>
Tested-by: Dominique Martinet <asmadeus@codewreck.org>
Acked-by: Dominique Martinet <asmadeus@codewreck.org>
cc: Eric Van Hensbergen <ericvh@kernel.org>
cc: Latchesar Ionkov <lucho@ionkov.net>
cc: Dominique Martinet <asmadeus@codewreck.org>
cc: Christian Schoenebeck <linux_oss@crudebyte.com>
cc: v9fs@lists.linux.dev
cc: linux-cachefs@redhat.com
cc: linux-fsdevel@vger.kernel.org
Signed-off-by: Sasha Levin <sashal@kernel.org>

diff --git a/fs/9p/v9fs_vfs.h b/fs/9p/v9fs_vfs.h
index cdf441f..dcce42d 100644 (file)
--- a/fs/9p/v9fs_vfs.h
+++ b/fs/9p/v9fs_vfs.h
@@ -42,6 +42,7 @@ struct inode *v9fs_alloc_inode(struct super_block *sb);
 void v9fs_free_inode(struct inode *inode);
 struct inode *v9fs_get_inode(struct super_block *sb, umode_t mode,
                             dev_t rdev);
+void v9fs_set_netfs_context(struct inode *inode);
 int v9fs_init_inode(struct v9fs_session_info *v9ses,
                    struct inode *inode, umode_t mode, dev_t rdev);
 void v9fs_evict_inode(struct inode *inode);

diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index 0d28ecf..ea695c4 100644 (file)
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -246,7 +246,7 @@ void v9fs_free_inode(struct inode *inode)
 /*
  * Set parameters for the netfs library
  */
-static void v9fs_set_netfs_context(struct inode *inode)
+void v9fs_set_netfs_context(struct inode *inode)
 {
        struct v9fs_inode *v9inode = V9FS_I(inode);
        netfs_inode_init(&v9inode->netfs, &v9fs_req_ops);
@@ -326,8 +326,6 @@ int v9fs_init_inode(struct v9fs_session_info *v9ses,
                err = -EINVAL;
                goto error;
        }
-
-       v9fs_set_netfs_context(inode);
 error:
        return err;
 
@@ -359,6 +357,7 @@ struct inode *v9fs_get_inode(struct super_block *sb, umode_t mode, dev_t rdev)
                iput(inode);
                return ERR_PTR(err);
        }
+       v9fs_set_netfs_context(inode);
        return inode;
 }
 
@@ -464,6 +463,7 @@ static struct inode *v9fs_qid_iget(struct super_block *sb,
                goto error;
 
        v9fs_stat2inode(st, inode, sb, 0);
+       v9fs_set_netfs_context(inode);
        v9fs_cache_inode_get_cookie(inode);
        unlock_new_inode(inode);
        return inode;

diff --git a/fs/9p/vfs_inode_dotl.c b/fs/9p/vfs_inode_dotl.c
index 1312f68..91bcee2 100644 (file)
--- a/fs/9p/vfs_inode_dotl.c
+++ b/fs/9p/vfs_inode_dotl.c
@@ -128,6 +128,7 @@ static struct inode *v9fs_qid_iget_dotl(struct super_block *sb,
                goto error;
 
        v9fs_stat2inode_dotl(st, inode, 0);
+       v9fs_set_netfs_context(inode);
        v9fs_cache_inode_get_cookie(inode);
        retval = v9fs_get_acl(inode, fid);
        if (retval)