From d0a5b995a308347fdb1bb0412df32acd0312523b Mon Sep 17 00:00:00 2001 From: Andreas Gruenbacher Date: Thu, 29 Sep 2016 17:48:39 +0200 Subject: vfs: Add IOP_XATTR inode operations flag The IOP_XATTR inode operations flag in inode->i_opflags indicates that the inode has xattr support. The flag is automatically set by new_inode() on filesystems with xattr support (where sb->s_xattr is defined), and cleared otherwise. Filesystems can explicitly clear it for inodes that should not have xattr support. Signed-off-by: Andreas Gruenbacher Signed-off-by: Al Viro --- fs/xattr.c | 12 ++++++++---- 1 file changed, 8 insertions(+), 4 deletions(-) (limited to 'fs/xattr.c') diff --git a/fs/xattr.c b/fs/xattr.c index bb3cbbfd982d..38b52a356d1b 100644 --- a/fs/xattr.c +++ b/fs/xattr.c @@ -53,10 +53,13 @@ strcmp_prefix(const char *a, const char *a_prefix) * Find the xattr_handler with the matching prefix. */ static const struct xattr_handler * -xattr_resolve_name(const struct xattr_handler **handlers, const char **name) +xattr_resolve_name(struct inode *inode, const char **name) { + const struct xattr_handler **handlers = inode->i_sb->s_xattr; const struct xattr_handler *handler; + if (!(inode->i_opflags & IOP_XATTR)) + return ERR_PTR(-EOPNOTSUPP); for_each_xattr_handler(handlers, handler) { const char *n; @@ -298,6 +301,7 @@ nolsm: error = -EOPNOTSUPP; return error; + } EXPORT_SYMBOL_GPL(vfs_getxattr); @@ -700,7 +704,7 @@ generic_getxattr(struct dentry *dentry, struct inode *inode, { const struct xattr_handler *handler; - handler = xattr_resolve_name(dentry->d_sb->s_xattr, &name); + handler = xattr_resolve_name(inode, &name); if (IS_ERR(handler)) return PTR_ERR(handler); return handler->get(handler, dentry, inode, @@ -755,7 +759,7 @@ generic_setxattr(struct dentry *dentry, struct inode *inode, const char *name, if (size == 0) value = ""; /* empty EA, do not remove */ - handler = xattr_resolve_name(dentry->d_sb->s_xattr, &name); + handler = xattr_resolve_name(inode, &name); if (IS_ERR(handler)) return PTR_ERR(handler); return handler->set(handler, dentry, inode, name, value, size, flags); @@ -770,7 +774,7 @@ generic_removexattr(struct dentry *dentry, const char *name) { const struct xattr_handler *handler; - handler = xattr_resolve_name(dentry->d_sb->s_xattr, &name); + handler = xattr_resolve_name(d_inode(dentry), &name); if (IS_ERR(handler)) return PTR_ERR(handler); return handler->set(handler, dentry, d_inode(dentry), name, NULL, -- cgit v1.2.3-55-g7522