See below for correction. Becky
2012/2/19 g_p g_p <[email protected]> > 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 argument > PVFS_isys_io call: Invalid argument > PVFS_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; > /********* buffer needs to be allocated, at least 100 bytes in your case, then you can send in the ********* pointer to the PVFS_sys_read call. > 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 > > > > > _______________________________________________ > Pvfs2-users mailing list > [email protected] > http://www.beowulf-underground.org/mailman/listinfo/pvfs2-users > > -- Becky Ligon OrangeFS Support and Development Omnibond Systems Anderson, South Carolina
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