/**
* For now implement truncate here and only for size == 0.
* Weak implementation in that we just delete the file and
* then re-create it, but don't set the user, group, and times to the old
* file's metadata.
*/
int dfs_truncate(const char *path, off_t size)
{
struct hdfsConn *conn = NULL;
hdfsFS fs;
dfs_context *dfs = (dfs_context*)fuse_get_context()->private_data;
TRACE1("truncate", path)
assert(path);
assert('/' == *path);
assert(dfs);
if (size != 0) {
return 0;
}
int ret = dfs_unlink(path);
if (ret != 0) {
return ret;
}
ret = fuseConnectAsThreadUid(&conn);
if (ret) {
fprintf(stderr, "fuseConnectAsThreadUid: failed to open a libhdfs "
"connection! error %d.\n", ret);
ret = -EIO;
goto cleanup;
}
fs = hdfsConnGetFs(conn);
int flags = O_WRONLY | O_CREAT;
hdfsFile file;
if ((file = (hdfsFile)hdfsOpenFile(fs, path, flags, 0, 0, 0)) == NULL) {
ERROR("Could not connect open file %s", path);
ret = -EIO;
goto cleanup;
}
if (hdfsCloseFile(fs, file) != 0) {
ERROR("Could not close file %s", path);
ret = -EIO;
goto cleanup;
}
cleanup:
if (conn) {
hdfsConnRelease(conn);
}
return ret;
}
/**
* For now implement truncate here and only for size == 0.
* Weak implementation in that we just delete the file and
* then re-create it, but don't set the user, group, and times to the old
* file's metadata.
*/
int dfs_truncate(const char *path, off_t size)
{
TRACE1("truncate", path)
dfs_context *dfs = (dfs_context*)fuse_get_context()->private_data;
assert(path);
assert('/' == *path);
assert(dfs);
if (size != 0) {
return -ENOTSUP;
}
int ret = dfs_unlink(path);
if (ret != 0) {
return ret;
}
hdfsFS userFS = doConnectAsUser(dfs->nn_hostname, dfs->nn_port);
if (userFS == NULL) {
ERROR("Could not connect");
ret = -EIO;
goto cleanup;
}
int flags = O_WRONLY | O_CREAT;
hdfsFile file;
if ((file = (hdfsFile)hdfsOpenFile(userFS, path, flags, 0, 0, 0)) == NULL) {
ERROR("Could not connect open file %s", path);
ret = -EIO;
goto cleanup;
}
if (hdfsCloseFile(userFS, file) != 0) {
ERROR("Could not close file %s", path);
ret = -EIO;
goto cleanup;
}
cleanup:
if (doDisconnect(userFS)) {
ret = -EIO;
}
return ret;
}
