Hello,
i'm trying to create a file and read from it.The creation is working fine. When
i'm trying to read the file, i get an error when i call the "pvfs_sys_read"
invalid (NULL) required argumentPVFS_isys_io call: Invalid
argumentPVFS_sys_read : Invalid argument (error class: 0)
The problem is in the following line:" ret = PVFS_sys_read(resp_create.ref,
file_req, 0,buffer, mem_req, &credentials, &resp_io, hints);"I can't understand
which one of the arguments is causing the problem,can you understand?How can i
solve it?
The program is as follows:
#include <stdio.h>#include <stdlib.h>#include <unistd.h>#include
<limits.h>#include <string.h>#include <sys/time.h>#include
<sys/types.h>#include <sys/stat.h>#include <fcntl.h>#include <time.h>#include
<libgen.h>#include <getopt.h>#include "pvfs2.h"
#include "str-utils.h"#include "pint-sysint-utils.h"#include "pvfs2-internal.h"
#include "pvfs2-hint.h"
int main(void) {
int ret = -1;
PVFS_sys_layout layout;
layout.algorithm = PVFS_SYS_LAYOUT_ROUND_ROBIN; layout.server_list.count
= 0; layout.server_list.servers = NULL;
/* Initialize the pvfs2 server */ ret = PVFS_util_init_defaults();
if(ret < 0) { PVFS_perror("PVFS_util_init_defaults", ret);
return -1; }
int rc; int num_segs; char *working_file = "test2.txt";
char directory[PVFS_NAME_MAX] = "/mnt/pvfs2/testDir/"; char
filename[PVFS_SEGMENT_MAX];
layout.algorithm = PVFS_SYS_LAYOUT_ROUND_ROBIN;
layout.server_list.count = 0; if(layout.server_list.servers) {
free(layout.server_list.servers); }
layout.server_list.servers = NULL;
char pvfs_path[PVFS_NAME_MAX] = {0}; PVFS_fs_id cur_fs;
PVFS_sysresp_lookup resp_lookup; PVFS_sysresp_create resp_create;
PVFS_credentials credentials; PVFS_object_ref parent_ref;
PVFS_sys_attr attr;
/* Translate path into pvfs2 relative path */ rc =
PINT_get_base_dir(working_file, directory, PVFS_NAME_MAX); num_segs =
PINT_string_count_segments(working_file); rc =
PINT_get_path_element(working_file, num_segs - 1,filename, PVFS_SEGMENT_MAX);
if (rc) { fprintf(stderr, "Unknown path format:
%s\n", working_file); ret = -1;
}
rc = PVFS_util_resolve(directory, &cur_fs,pvfs_path, PVFS_NAME_MAX);
if (rc) { PVFS_perror("PVFS_util_resolve", rc);
ret = -1;
}
PVFS_util_gen_credentials(&credentials);
memset(&resp_lookup, 0, sizeof(PVFS_sysresp_lookup)); rc =
PVFS_sys_lookup(cur_fs, pvfs_path, &credentials,&resp_lookup,
PVFS2_LOOKUP_LINK_NO_FOLLOW, NULL); if (rc) {
PVFS_perror("PVFS_sys_lookup", rc); ret = -1;
}
/* Set attributes */ imemset(&attr, 0, sizeof(PVFS_sys_attr));
attr.owner = credentials.uid; attr.group = credentials.gid;
attr.perms = 0777; attr.atime = time(NULL); attr.mtime =
attr.atime; attr.mask = PVFS_ATTR_SYS_ALL_SETABLE;
attr.dfile_count = 0;
parent_ref = resp_lookup.ref;
layout.algorithm = PVFS_SYS_LAYOUT_RANDOM;
lrc = PVFS_sys_create(filename, parent_ref,
attr, parent_ref,
attr, &credentials,
NULL, &resp_create,
&layout, NULL); if (rc)
{ fprintf(stderr, "Error: An error occurred while creating
%s\n",working_file); PVFS_perror("PVFS_sys_create", rc);
ret = -1; }
/* Everthing fine till here! */
PVFS_Request mem_req, file_req; PVFS_sysresp_io resp_io;
char * buffer; size_t count = 100; int64_t offset;
PVFS_hint hints = NULL; file_req = PVFS_BYTE; ret =
PVFS_Request_contiguous(count, PVFS_BYTE, &mem_req);
if (ret < 0) { fprintf(stderr, "Error:
PVFS_Request_contiguous failure\n"); return (ret); }
ret = PVFS_sys_read(resp_create.ref, file_req, 0,buffer, mem_req, &credentials,
&resp_io, hints); /* problem here!!! */ if (ret == 0) {
PVFS_Request_free(&mem_req);
} else { PVFS_perror("PVFS_sys_read === ", ret);
printf("ret = %d\n",ret); } PVFS_sys_finalize();
}
Can you understand where the problem is?Where is that NULL value that causes
the problem?Thanks, in advance
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