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Merge pull request #311 from humphd/xattr-null-node 

Add safety around accessing node for an OFD, clean-up xattr code for path vs. ofd
This commit is contained in:
David Humphrey 2014-10-17 13:46:45 -04:00
parent 4dd322c560 f9e21cd576
commit a3afbe472b
3 changed files with 121 additions and 64 deletions
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127
src/filesystem/implementation.js
View File

@ -269,45 +269,26 @@ function find_node(context, path, callback) {
/**
* set extended attribute (refactor)
*/
function set_extended_attribute (context, path_or_fd, name, value, flag, callback) {
var path;
function set_xattr (error, node) {
var xattr = (node ? node.xattrs[name] : null);
function update_time(error) {
if(error) {
callback(error);
} else {
update_node_times(context, path, node, { ctime: Date.now() }, callback);
}
}
if (error) {
function set_extended_attribute (context, path, node, name, value, flag, callback) {
function update_time(error) {
if(error) {
callback(error);
}
else if (flag === XATTR_CREATE && node.xattrs.hasOwnProperty(name)) {
callback(new Errors.EEXIST('attribute already exists', path_or_fd));
}
else if (flag === XATTR_REPLACE && !node.xattrs.hasOwnProperty(name)) {
callback(new Errors.ENOATTR(null, path_or_fd));
}
else {
node.xattrs[name] = value;
context.putObject(node.id, node, update_time);
} else {
update_node_times(context, path, node, { ctime: Date.now() }, callback);
}
}
if (typeof path_or_fd == 'string') {
path = path_or_fd;
find_node(context, path_or_fd, set_xattr);
var xattrs = node.xattrs;
if (flag === XATTR_CREATE && xattrs.hasOwnProperty(name)) {
callback(new Errors.EEXIST('attribute already exists', path));
}
else if (typeof path_or_fd == 'object' && typeof path_or_fd.id == 'string') {
path = path_or_fd.path;
context.getObject(path_or_fd.id, set_xattr);
else if (flag === XATTR_REPLACE && !xattrs.hasOwnProperty(name)) {
callback(new Errors.ENOATTR(null, path));
}
else {
callback(new Errors.EINVAL('path or file descriptor of wrong type', path_or_fd));
xattrs[name] = value;
context.putObject(node.id, node, update_time);
}
}
@ -848,7 +829,7 @@ function stat_file(context, path, callback) {
}
function fstat_file(context, ofd, callback) {
context.getObject(ofd.id, callback);
ofd.getNode(context, callback);
}
function lstat_file(context, path, callback) {
@ -1315,7 +1296,7 @@ function ftruncate_file(context, ofd, length, callback) {
if(length < 0) {
callback(new Errors.EINVAL('length cannot be negative'));
} else {
context.getObject(ofd.id, read_file_data);
ofd.getNode(context, read_file_data);
}
}
@ -1358,13 +1339,20 @@ function futimes_file(context, ofd, atime, mtime, callback) {
callback(new Errors.EINVAL('atime and mtime must be positive integers'));
}
else {
context.getObject(ofd.id, update_times);
ofd.getNode(context, update_times);
}
}
function setxattr_file(context, path, name, value, flag, callback) {
path = normalize(path);
function setxattr(error, node) {
if(error) {
return callback(error);
}
set_extended_attribute(context, path, node, name, value, flag, callback);
}
if (typeof name != 'string') {
callback(new Errors.EINVAL('attribute name must be a string', path));
}
@ -1376,12 +1364,19 @@ function setxattr_file(context, path, name, value, flag, callback) {
callback(new Errors.EINVAL('invalid flag, must be null, XATTR_CREATE or XATTR_REPLACE', path));
}
else {
set_extended_attribute(context, path, name, value, flag, callback);
find_node(context, path, setxattr);
}
}
function fsetxattr_file (context, ofd, name, value, flag, callback) {
if (typeof name != 'string') {
function setxattr(error, node) {
if(error) {
return callback(error);
}
set_extended_attribute(context, ofd.path, node, name, value, flag, callback);
}
if (typeof name !== 'string') {
callback(new Errors.EINVAL('attribute name must be a string'));
}
else if (!name) {
@ -1392,7 +1387,7 @@ function fsetxattr_file (context, ofd, name, value, flag, callback) {
callback(new Errors.EINVAL('invalid flag, must be null, XATTR_CREATE or XATTR_REPLACE'));
}
else {
set_extended_attribute(context, ofd, name, value, flag, callback);
ofd.getNode(context, setxattr);
}
}
@ -1400,16 +1395,17 @@ function getxattr_file (context, path, name, callback) {
path = normalize(path);
function get_xattr(error, node) {
var xattr = (node ? node.xattrs[name] : null);
if (error) {
callback (error);
if(error) {
return callback(error);
}
else if (!node.xattrs.hasOwnProperty(name)) {
var xattrs = node.xattrs;
if (!xattrs.hasOwnProperty(name)) {
callback(new Errors.ENOATTR(null, path));
}
else {
callback(null, node.xattrs[name]);
callback(null, xattrs[name]);
}
}
@ -1427,16 +1423,17 @@ function getxattr_file (context, path, name, callback) {
function fgetxattr_file (context, ofd, name, callback) {
function get_xattr (error, node) {
var xattr = (node ? node.xattrs[name] : null);
if (error) {
callback(error);
return callback(error);
}
else if (!node.xattrs.hasOwnProperty(name)) {
var xattrs = node.xattrs;
if (!xattrs.hasOwnProperty(name)) {
callback(new Errors.ENOATTR());
}
else {
callback(null, node.xattrs[name]);
callback(null, xattrs[name]);
}
}
@ -1447,7 +1444,7 @@ function fgetxattr_file (context, ofd, name, callback) {
callback(new Errors.EINVAL('attribute name cannot be an empty string'));
}
else {
context.getObject(ofd.id, get_xattr);
ofd.getNode(context, get_xattr);
}
}
@ -1455,7 +1452,9 @@ function removexattr_file (context, path, name, callback) {
path = normalize(path);
function remove_xattr (error, node) {
var xattr = (node ? node.xattrs : null);
if (error) {
return callback(error);
}
function update_time(error) {
if(error) {
@ -1465,19 +1464,18 @@ function removexattr_file (context, path, name, callback) {
}
}
if (error) {
callback(error);
}
else if (!xattr.hasOwnProperty(name)) {
var xattrs = node.xattrs;
if (!xattrs.hasOwnProperty(name)) {
callback(new Errors.ENOATTR(null, path));
}
else {
delete node.xattrs[name];
delete xattrs[name];
context.putObject(node.id, node, update_time);
}
}
if (typeof name != 'string') {
if (typeof name !== 'string') {
callback(new Errors.EINVAL('attribute name must be a string', path));
}
else if (!name) {
@ -1491,6 +1489,10 @@ function removexattr_file (context, path, name, callback) {
function fremovexattr_file (context, ofd, name, callback) {
function remove_xattr (error, node) {
if (error) {
return callback(error);
}
function update_time(error) {
if(error) {
callback(error);
@ -1499,14 +1501,13 @@ function fremovexattr_file (context, ofd, name, callback) {
}
}
if (error) {
callback(error);
}
else if (!node.xattrs.hasOwnProperty(name)) {
var xattrs = node.xattrs;
if (!xattrs.hasOwnProperty(name)) {
callback(new Errors.ENOATTR());
}
else {
delete node.xattrs[name];
delete xattrs[name];
context.putObject(node.id, node, update_time);
}
}
@ -1518,7 +1519,7 @@ function fremovexattr_file (context, ofd, name, callback) {
callback(new Errors.EINVAL('attribute name cannot be an empty string'));
}
else {
context.getObject(ofd.id, remove_xattr);
ofd.getNode(context, remove_xattr);
}
}

27
src/open-file-description.js
View File

@ -1,6 +1,31 @@
module.exports = function OpenFileDescription(path, id, flags, position) {
var Errors = require('./errors.js');
function OpenFileDescription(path, id, flags, position) {
this.path = path;
this.id = id;
this.flags = flags;
this.position = position;
}
// Tries to find the node associated with an ofd's `id`.
// If not found, an error is returned on the callback.
OpenFileDescription.prototype.getNode = function(context, callback) {
var id = this.id;
var path = this.path;
function check_if_node_exists(error, node) {
if(error) {
return callback(error);
}
if(!node) {
return callback(new Errors.EBADF('file descriptor refers to unknown node', path));
}
callback(null, node);
}
context.getObject(id, check_if_node_exists);
};
module.exports = OpenFileDescription;

31
tests/spec/fs.open.spec.js
View File

@ -106,4 +106,35 @@ describe('fs.open', function() {
});
});
});
/**
* This test is currently correct per our code, but incorrect according to the spec.
* When we fix https://github.com/filerjs/filer/issues/314 we'll have to update this.
*/
it('should error if an ofd\'s node goes away while open', function(done) {
var fs = util.fs();
fs.writeFile('/myfile', 'data', function(error) {
if(error) throw error;
fs.open('/myfile', 'r', function(error, fd) {
if(error) throw error;
// Delete the file while it's still open
fs.unlink('/myfile', function(error) {
if(error) throw error;
// This should fail now, since fd points to a bad node
fs.fstat(fd, function(error, result) {
expect(error).to.exist;
expect(error.code).to.equal('EBADF');
expect(result).not.to.exist;
fs.close(fd);
done();
});
});
});
});
});
});