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Registered in England and Wales under Company Registration No. 3798903 Subject: [PATCH 19/67] cachefiles: Don't set an xattr on the root of the cache From: David Howells To: linux-cachefs@redhat.com Cc: dhowells@redhat.com, Trond Myklebust , Anna Schumaker , Steve French , Dominique Martinet , Jeff Layton , Matthew Wilcox , Alexander Viro , Omar Sandoval , Linus Torvalds , linux-afs@lists.infradead.org, linux-nfs@vger.kernel.org, linux-cifs@vger.kernel.org, ceph-devel@vger.kernel.org, v9fs-developer@lists.sourceforge.net, linux-fsdevel@vger.kernel.org, linux-kernel@vger.kernel.org Date: Mon, 18 Oct 2021 15:55:33 +0100 Message-ID: <163456893374.2614702.11747731163000539462.stgit@warthog.procyon.org.uk> In-Reply-To: <163456861570.2614702.14754548462706508617.stgit@warthog.procyon.org.uk> References: <163456861570.2614702.14754548462706508617.stgit@warthog.procyon.org.uk> User-Agent: StGit/0.23 MIME-Version: 1.0 Content-Type: text/plain; charset="utf-8" Content-Transfer-Encoding: 7bit X-Scanned-By: MIMEDefang 2.79 on 10.5.11.15 Precedence: bulk List-ID: X-Mailing-List: linux-cifs@vger.kernel.org cachefiles_check_object_type() sets an xattr on the root of the cache, but it's pointless because it never conveys any useful information, so don't do that. Signed-off-by: David Howells --- fs/cachefiles/bind.c | 4 -- fs/cachefiles/internal.h | 1 - fs/cachefiles/xattr.c | 76 ---------------------------------------------- 3 files changed, 81 deletions(-) diff --git a/fs/cachefiles/bind.c b/fs/cachefiles/bind.c index d463d89f5db8..6720c07f3d85 100644 --- a/fs/cachefiles/bind.c +++ b/fs/cachefiles/bind.c @@ -199,10 +199,6 @@ static int cachefiles_daemon_add_cache(struct cachefiles_cache *cache) fsdef->dentry = cachedir; fsdef->fscache.cookie = NULL; - ret = cachefiles_check_object_type(fsdef); - if (ret < 0) - goto error_unsupported; - /* get the graveyard directory */ graveyard = cachefiles_get_directory(cache, root, "graveyard"); if (IS_ERR(graveyard)) { diff --git a/fs/cachefiles/internal.h b/fs/cachefiles/internal.h index 0515add2b7e8..6464a6821bfb 100644 --- a/fs/cachefiles/internal.h +++ b/fs/cachefiles/internal.h @@ -169,7 +169,6 @@ static inline void cachefiles_end_secure(struct cachefiles_cache *cache, /* * xattr.c */ -extern int cachefiles_check_object_type(struct cachefiles_object *object); extern int cachefiles_set_object_xattr(struct cachefiles_object *object, unsigned int xattr_flags); extern int cachefiles_check_auxdata(struct cachefiles_object *object); diff --git a/fs/cachefiles/xattr.c b/fs/cachefiles/xattr.c index bcc4a2dfe1e8..8b9f30f9ce21 100644 --- a/fs/cachefiles/xattr.c +++ b/fs/cachefiles/xattr.c @@ -23,82 +23,6 @@ struct cachefiles_xattr { static const char cachefiles_xattr_cache[] = XATTR_USER_PREFIX "CacheFiles.cache"; -/* - * check the type label on an object - * - done using xattrs - */ -int cachefiles_check_object_type(struct cachefiles_object *object) -{ - struct dentry *dentry = object->dentry; - char type[3], xtype[3]; - int ret; - - ASSERT(dentry); - ASSERT(d_backing_inode(dentry)); - - if (!object->fscache.cookie) - strcpy(type, "C3"); - else - snprintf(type, 3, "%02x", object->fscache.cookie->type); - - _enter("%x{%s}", object->fscache.debug_id, type); - - /* attempt to install a type label directly */ - ret = vfs_setxattr(&init_user_ns, dentry, cachefiles_xattr_cache, type, - 2, XATTR_CREATE); - if (ret == 0) { - _debug("SET"); /* we succeeded */ - goto error; - } - - if (ret != -EEXIST) { - pr_err("Can't set xattr on %pd [%lu] (err %d)\n", - dentry, d_backing_inode(dentry)->i_ino, - -ret); - goto error; - } - - /* read the current type label */ - ret = vfs_getxattr(&init_user_ns, dentry, cachefiles_xattr_cache, xtype, - 3); - if (ret < 0) { - if (ret == -ERANGE) - goto bad_type_length; - - pr_err("Can't read xattr on %pd [%lu] (err %d)\n", - dentry, d_backing_inode(dentry)->i_ino, - -ret); - goto error; - } - - /* check the type is what we're expecting */ - if (ret != 2) - goto bad_type_length; - - if (xtype[0] != type[0] || xtype[1] != type[1]) - goto bad_type; - - ret = 0; - -error: - _leave(" = %d", ret); - return ret; - -bad_type_length: - pr_err("Cache object %lu type xattr length incorrect\n", - d_backing_inode(dentry)->i_ino); - ret = -EIO; - goto error; - -bad_type: - xtype[2] = 0; - pr_err("Cache object %pd [%lu] type %s not %s\n", - dentry, d_backing_inode(dentry)->i_ino, - xtype, type); - ret = -EIO; - goto error; -} - /* * set the state xattr on a cache file */