// low-level mkdir
int fs_entry_mkdir_lowlevel( struct fs_core* core, char const* path, struct fs_entry* parent, char const* path_basename, mode_t mode, uint64_t user, uint64_t vol, int64_t mtime_sec, int32_t mtime_nsec ) {
// resolve the child
struct fs_entry* child = fs_entry_set_find_name( parent->children, path_basename );
int err = 0;
if( child == NULL ) {
// create an fs_entry and attach it
child = CALLOC_LIST( struct fs_entry, 1 );
fs_entry_init_dir( core, child, path_basename, 0, fs_entry_next_file_version(), user, 0, vol, mode, mtime_sec, mtime_nsec, 0, 0 );
// add . and ..
fs_entry_set_insert( child->children, ".", child );
fs_entry_set_insert( child->children, "..", parent );
fs_entry_attach_lowlevel( core, parent, child );
}
// make a node (regular files only at this time)
int fs_entry_mknod( struct fs_core* core, char const* path, mode_t mode, dev_t dev, uint64_t user, uint64_t vol ) {
// only regular files at this time...
if( ! ( S_ISREG( mode ) || S_ISFIFO( mode ) ) ) {
return -ENOTSUP;
}
// revalidate this path
int rc = fs_entry_revalidate_path( core, path );
if( rc != 0 && rc != -ENOENT ) {
// consistency cannot be guaranteed
SG_error("fs_entry_revalidate_path(%s) rc = %d\n", path, rc );
return rc;
}
int err = 0;
// get the parent directory and lock it
char* path_dirname = md_dirname( path, NULL );
struct fs_entry* parent = fs_entry_resolve_path( core, path_dirname, user, vol, true, &err );
free( path_dirname );
if( !IS_DIR_READABLE( parent->mode, parent->owner, parent->volume, user, vol ) ) {
// not searchable
fs_entry_unlock( parent );
return -EACCES;
}
if( !IS_WRITEABLE( parent->mode, parent->owner, parent->volume, user, vol ) ) {
// not writeable
fs_entry_unlock( parent );
return -EACCES;
}
uint64_t parent_id = parent->file_id;
char* parent_name = strdup( parent->name );
char* path_basename = md_basename( path, NULL );
// make sure it doesn't exist already (or isn't in the process of being deleted, since we might have to re-create it if deleting it fails)
if( fs_entry_set_find_name( parent->children, path_basename ) != NULL ) {
free( path_basename );
fs_entry_unlock( parent );
free( parent_name );
return -EEXIST;
}
struct fs_entry* child = (struct fs_entry*)calloc( sizeof(struct fs_entry), 1 );
struct timespec ts;
clock_gettime( CLOCK_REALTIME, &ts );
int mmode = 0;
if (S_ISFIFO(mode)) {
mmode = ( mode & 0777 ) | S_IFIFO;
err = fs_entry_init_fifo( core, child, path_basename, 0, fs_entry_next_file_version(), user, core->gateway, vol, mmode, 0, ts.tv_sec, ts.tv_nsec, 0, 0 );
}
if (S_ISREG(mode)) {
mmode = ( mode & 0777 );
err = fs_entry_init_file( core, child, path_basename, 0, fs_entry_next_file_version(), user, core->gateway, vol, mmode, 0, ts.tv_sec, ts.tv_nsec, 0, 0 );
}
if( err == 0 ) {
// mark it as created in this session
child->created_in_session = true;
// we're creating, so this manifest is initialized (to zero blocks)
child->manifest->initialize_empty( child->version );
fs_entry_wlock( child );
// call the driver
err = driver_create_file( core, core->closure, path, child );
if( err != 0 ) {
// undo
SG_error("driver_create_file(%s) rc = %d\n", path, err );
child->open_count = 0;
fs_entry_unlock( child );
fs_entry_destroy( child, false );
free( child );
}
else {
// attach the file
fs_entry_attach_lowlevel( core, parent, child );
struct md_entry data;
fs_entry_to_md_entry( core, &data, child, parent_id, parent_name );
// create the child on the MS, obtaining its file ID and write nonce
err = ms_client_create( core->ms, &child->file_id, &child->write_nonce, &data );
md_entry_free( &data );
if( err != 0 ) {
SG_error( "ms_client_create(%s) rc = %d\n", path, err );
err = -EREMOTEIO;
child->open_count = 0;
fs_entry_unlock( child );
fs_entry_detach_lowlevel( core, parent, child );
free( child );
}
else {
fs_entry_unlock( child );
}
}
}
fs_entry_unlock( parent );
free( parent_name );
free( path_basename );
return err;
}
// carry out the create locally.
// check permissions, initialize the child, and add it as a child of parent.
// return the initialized child (which will NOT be locked) via *ret_child
// return 0 on success
// return -EACCES on permission failure
// parent MUST be write locked
int fs_entry_do_create( struct fs_core* core, char const* path, struct fs_entry* parent, struct fs_entry** ret_child, uint64_t user, uint64_t vol, mode_t mode ) {
int rc = 0;
struct fs_entry* child = NULL;
if( !IS_WRITEABLE(parent->mode, parent->owner, parent->volume, user, vol) ) {
// can't create
return -EACCES;
}
else {
struct timespec ts;
clock_gettime( CLOCK_REALTIME, &ts );
// can create--initialize the child
child = SG_CALLOC( struct fs_entry, 1 );
char* path_basename = md_basename( path, NULL );
rc = fs_entry_init_file( core, child, path_basename, 0, fs_entry_next_file_version(), user, core->gateway, vol, mode, 0, ts.tv_sec, ts.tv_nsec, 0, 0 );
free( path_basename );
if( rc != 0 ) {
SG_error("fs_entry_init_file(%s) rc = %d\n", path, rc );
fs_entry_destroy( child, false );
free( child );
return rc;
}
else {
// mark it as created in this session
child->created_in_session = true;
// we're creating, so this manifest is initialized (to zero blocks)
child->manifest->initialize_empty( child->version );
// run the driver
int driver_rc = driver_create_file( core, core->closure, path, child );
if( driver_rc != 0 ) {
SG_error("driver_create_file(%s) rc = %d\n", path, driver_rc );
fs_entry_destroy( child, false );
free( child );
return driver_rc;
}
// insert it into the filesystem
fs_entry_wlock( child );
// open it
child->open_count++;
fs_entry_setup_working_data( core, child );
fs_entry_attach_lowlevel( core, parent, child );
fs_entry_unlock( child );
*ret_child = child;
}
}
return 0;
}
