From: Andreas Gruenbacher Subject: [PATCH v23 10/22] posix_acl: Improve xattr fixup code Date: Thu, 30 Jun 2016 15:47:01 +0200 Message-ID: <1467294433-3222-11-git-send-email-agruenba@redhat.com> References: <1467294433-3222-1-git-send-email-agruenba@redhat.com> Mime-Version: 1.0 Content-Type: text/plain; charset="us-ascii" Content-Transfer-Encoding: 7bit Cc: "J. Bruce Fields" , linux-nfs@vger.kernel.org, Theodore Ts'o , Andreas Gruenbacher , linux-cifs@vger.kernel.org, linux-api@vger.kernel.org, Trond Myklebust , linux-kernel@vger.kernel.org, xfs@oss.sgi.com, Christoph Hellwig , Andreas Dilger , linux-fsdevel@vger.kernel.org, Jeff Layton , linux-ext4@vger.kernel.org, Anna Schumaker To: Alexander Viro Return-path: In-Reply-To: <1467294433-3222-1-git-send-email-agruenba@redhat.com> List-Unsubscribe: , List-Archive: List-Post: List-Help: List-Subscribe: , Errors-To: xfs-bounces@oss.sgi.com Sender: xfs-bounces@oss.sgi.com List-Id: linux-ext4.vger.kernel.org Both XATTR_NAME_POSIX_ACL_ACCESS and XATTR_NAME_POSIX_ACL_DEFAULT have the same XATTR_SYSTEM_PREFIX prefix; don't check for the same prefix repeatedly. Signed-off-by: Andreas Gruenbacher Reviewed-by: Steve French --- fs/xattr.c | 29 +++++++++++++++++++++++------ 1 file changed, 23 insertions(+), 6 deletions(-) diff --git a/fs/xattr.c b/fs/xattr.c index 4beafc4..61ac218 100644 --- a/fs/xattr.c +++ b/fs/xattr.c @@ -295,6 +295,16 @@ out: } EXPORT_SYMBOL_GPL(vfs_removexattr); +static void +fix_xattr_from_user(const char *kname, void *kvalue, size_t size) +{ + if (strncmp(kname, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN)) + return; + kname += XATTR_SYSTEM_PREFIX_LEN; + if (!strcmp(kname, XATTR_POSIX_ACL_ACCESS) || + !strcmp(kname, XATTR_POSIX_ACL_DEFAULT)) + posix_acl_fix_xattr_from_user(kvalue, size); +} /* * Extended attribute SET operations @@ -329,9 +339,7 @@ setxattr(struct dentry *d, const char __user *name, const void __user *value, error = -EFAULT; goto out; } - if ((strcmp(kname, XATTR_NAME_POSIX_ACL_ACCESS) == 0) || - (strcmp(kname, XATTR_NAME_POSIX_ACL_DEFAULT) == 0)) - posix_acl_fix_xattr_from_user(kvalue, size); + fix_xattr_from_user(kname, kvalue, size); } error = vfs_setxattr(d, kname, kvalue, size, flags); @@ -396,6 +404,17 @@ SYSCALL_DEFINE5(fsetxattr, int, fd, const char __user *, name, return error; } +static void +fix_xattr_to_user(const char *kname, void *kvalue, size_t size) +{ + if (strncmp(kname, XATTR_SYSTEM_PREFIX, XATTR_SYSTEM_PREFIX_LEN)) + return; + kname += XATTR_SYSTEM_PREFIX_LEN; + if (!strcmp(kname, XATTR_POSIX_ACL_ACCESS) || + !strcmp(kname, XATTR_POSIX_ACL_DEFAULT)) + posix_acl_fix_xattr_to_user(kvalue, size); +} + /* * Extended attribute GET operations */ @@ -426,9 +445,7 @@ getxattr(struct dentry *d, const char __user *name, void __user *value, error = vfs_getxattr(d, kname, kvalue, size); if (error > 0) { - if ((strcmp(kname, XATTR_NAME_POSIX_ACL_ACCESS) == 0) || - (strcmp(kname, XATTR_NAME_POSIX_ACL_DEFAULT) == 0)) - posix_acl_fix_xattr_to_user(kvalue, size); + fix_xattr_to_user(kname, kvalue, size); if (size && copy_to_user(value, kvalue, error)) error = -EFAULT; } else if (error == -ERANGE && size >= XATTR_SIZE_MAX) { -- 2.5.5 _______________________________________________ xfs mailing list xfs@oss.sgi.com http://oss.sgi.com/mailman/listinfo/xfs