Back to index

nbd  3.2
Classes | Defines | Typedefs | Enumerations | Functions | Variables
nbd-tester-client.c File Reference
#include <stdlib.h>
#include <stdio.h>
#include <stdbool.h>
#include <string.h>
#include <sys/time.h>
#include <sys/types.h>
#include <sys/socket.h>
#include <sys/stat.h>
#include <sys/mman.h>
#include <fcntl.h>
#include <syslog.h>
#include <unistd.h>
#include "config.h"
#include "lfs.h"
#include <netinet/in.h>
#include <glib.h>
#include "cliserv.h"

Go to the source code of this file.

Classes

struct  reqcontext
struct  rclist
struct  chunk
struct  chunklist
struct  blkitem

Defines

#define MY_NAME   "nbd-tester-client"
#define TEST_WRITE   (1<<0)
#define TEST_FLUSH   (1<<1)
#define READ_ALL_ERRCHK(f, buf, len, whereto, errmsg...)   if((read_all(f, buf, len))<=0) { snprintf(errstr, errstr_len, ##errmsg); goto whereto; }
#define READ_ALL_ERR_RT(f, buf, len, whereto, rval, errmsg...)   if((read_all(f, buf, len))<=0) { snprintf(errstr, errstr_len, ##errmsg); retval = rval; goto whereto; }
#define WRITE_ALL_ERRCHK(f, buf, len, whereto, errmsg...)   if((write_all(f, buf, len))<=0) { snprintf(errstr, errstr_len, ##errmsg); goto whereto; }
#define WRITE_ALL_ERR_RT(f, buf, len, whereto, rval, errmsg...)   if((write_all(f, buf, len))<=0) { snprintf(errstr, errstr_len, ##errmsg); retval = rval; goto whereto; }

Typedefs

typedef int(* testfunc )(gchar *, int, char *, int, char, char, int)

Enumerations

enum  CONNECTION_TYPE {
  CONNECTION_TYPE_NONE, CONNECTION_TYPE_CONNECT, CONNECTION_TYPE_INIT_PASSWD, CONNECTION_TYPE_CLISERV,
  CONNECTION_TYPE_FULL
}
enum  CLOSE_TYPE { CONNECTION_CLOSE_PROPERLY, CONNECTION_CLOSE_FAST }

Functions

void rclist_unlink (struct rclist *l, struct reqcontext *p)
void rclist_addtail (struct rclist *l, struct reqcontext *p)
void chunklist_unlink (struct chunklist *l, struct chunk *p)
void chunklist_addtail (struct chunklist *l, struct chunk *p)
void addbuffer (struct chunklist *l, void *data, uint64_t len)
int writebuffer (int fd, struct chunklist *l)
int timeval_subtract (struct timeval *result, struct timeval *x, struct timeval *y)
double timeval_diff_to_double (struct timeval *x, struct timeval *y)
static int read_all (int f, void *buf, size_t len)
static int write_all (int f, void *buf, size_t len)
int setup_connection (gchar *hostname, int port, gchar *name, CONNECTION_TYPE ctype, int *serverflags)
int close_connection (int sock, CLOSE_TYPE type)
int read_packet_check_header (int sock, size_t datasize, long long int curhandle)
int oversize_test (gchar *hostname, int port, char *name, int sock, char sock_is_open, char close_sock, int testflags)
int throughput_test (gchar *hostname, int port, char *name, int sock, char sock_is_open, char close_sock, int testflags)
static void makebuf (char *buf, uint64_t seq, uint64_t blknum)
static int checkbuf (char *buf, uint64_t seq, uint64_t blknum)
static void dumpcommand (char *text, uint32_t command)
uint64_t getrandomhandle (GHashTable *phash)
int integrity_test (gchar *hostname, int port, char *name, int sock, char sock_is_open, char close_sock, int testflags)
int main (int argc, char **argv)

Variables

static gchar errstr [1024]
static const int errstr_len = 1024
static uint64_t size
static int looseordering = 0
static gchar * transactionlog = "nbd-tester-client.tr"

Class Documentation

struct reqcontext

Definition at line 66 of file nbd-tester-client.c.

Collaboration diagram for reqcontext:
Class Members
struct reqcontext * next
char orighandle
struct reqcontext * prev
uint64_t seq
struct rclist

Definition at line 74 of file nbd-tester-client.c.

Collaboration diagram for rclist:
Class Members
struct reqcontext * head
int numitems
struct reqcontext * tail
struct chunk

Definition at line 80 of file nbd-tester-client.c.

Collaboration diagram for chunk:
Class Members
char * buffer
uint64_t length
struct chunk * next
struct chunk * prev
char * readptr
uint64_t space
char * writeptr
struct chunklist

Definition at line 90 of file nbd-tester-client.c.

Collaboration diagram for chunklist:
Class Members
struct chunk * head
int numitems
struct chunk * tail
struct blkitem

Definition at line 96 of file nbd-tester-client.c.

Class Members
int32_t inflightr
int32_t inflightw
uint32_t seq

Define Documentation

#define MY_NAME   "nbd-tester-client"

Definition at line 41 of file nbd-tester-client.c.

#define READ_ALL_ERR_RT (   f,
  buf,
  len,
  whereto,
  rval,
  errmsg... 
)    if((read_all(f, buf, len))<=0) { snprintf(errstr, errstr_len, ##errmsg); retval = rval; goto whereto; }

Definition at line 333 of file nbd-tester-client.c.

#define READ_ALL_ERRCHK (   f,
  buf,
  len,
  whereto,
  errmsg... 
)    if((read_all(f, buf, len))<=0) { snprintf(errstr, errstr_len, ##errmsg); goto whereto; }

Definition at line 332 of file nbd-tester-client.c.

#define TEST_FLUSH   (1<<1)

Definition at line 268 of file nbd-tester-client.c.

#define TEST_WRITE   (1<<0)

Definition at line 267 of file nbd-tester-client.c.

#define WRITE_ALL_ERR_RT (   f,
  buf,
  len,
  whereto,
  rval,
  errmsg... 
)    if((write_all(f, buf, len))<=0) { snprintf(errstr, errstr_len, ##errmsg); retval = rval; goto whereto; }

Definition at line 336 of file nbd-tester-client.c.

#define WRITE_ALL_ERRCHK (   f,
  buf,
  len,
  whereto,
  errmsg... 
)    if((write_all(f, buf, len))<=0) { snprintf(errstr, errstr_len, ##errmsg); goto whereto; }

Definition at line 335 of file nbd-tester-client.c.


Typedef Documentation

typedef int(* testfunc)(gchar *, int, char *, int, char, char, int)

Definition at line 1248 of file nbd-tester-client.c.


Enumeration Type Documentation

enum CLOSE_TYPE
Enumerator:
CONNECTION_CLOSE_PROPERLY 
CONNECTION_CLOSE_FAST 

Definition at line 61 of file nbd-tester-client.c.

Enumerator:
CONNECTION_TYPE_NONE 
CONNECTION_TYPE_CONNECT 
CONNECTION_TYPE_INIT_PASSWD 
CONNECTION_TYPE_CLISERV 
CONNECTION_TYPE_FULL 

Definition at line 53 of file nbd-tester-client.c.


Function Documentation

void addbuffer ( struct chunklist l,
void *  data,
uint64_t  len 
)

Definition at line 191 of file nbd-tester-client.c.

                                                                {
       void * buf;
       uint64_t size = 64*1024;
       struct chunk * pchunk;

       while (len>0)
       {
              /* First see if there is a current chunk, and if it has space */
              if (l->tail && l->tail->space) {
                     uint64_t towrite = len;
                     if (towrite > l->tail->space)
                            towrite = l->tail->space;
                     memcpy(l->tail->writeptr, data, towrite);
                     l->tail->length += towrite;
                     l->tail->space -= towrite;
                     l->tail->writeptr += towrite;
                     len -= towrite;
                     data += towrite;
              }

              if (len>0) {
                     /* We still need to write more, so prepare a new chunk */
                     if ((NULL == (buf = malloc(size))) || (NULL == (pchunk = calloc(1, sizeof(struct chunk))))) {
                            g_critical("Out of memory");
                            exit (1);
                     }

                     pchunk->buffer = buf;
                     pchunk->readptr = buf;
                     pchunk->writeptr = buf;
                     pchunk->space = size;
                     chunklist_addtail(l, pchunk);
              }
       }

}

Here is the call graph for this function:

Here is the caller graph for this function:

static int checkbuf ( char *  buf,
uint64_t  seq,
uint64_t  blknum 
) [inline, static]

Definition at line 717 of file nbd-tester-client.c.

                                                                     {
       uint64_t cmp[64]; // 512/8 = 64
       makebuf((char *)cmp, seq, blknum);
       return memcmp(cmp, buf, 512)?-1:0;
}

Here is the call graph for this function:

Here is the caller graph for this function:

void chunklist_addtail ( struct chunklist l,
struct chunk p 
)

Definition at line 169 of file nbd-tester-client.c.

                                                               {
       if (!p || !l)
              return;
       if (l->tail) {
              if (l->tail->next)
                     g_warning("addtail found list tail has a next pointer");
              l->tail->next = p;
              p->next = NULL;
              p->prev = l->tail;
              l->tail = p;
       } else {
              if (l->head)
                     g_warning("addtail found no list tail but a list head");
              l->head = p;
              l->tail = p;
              p->prev = NULL;
              p->next = NULL;
       }
       l->numitems++;
}

Here is the caller graph for this function:

void chunklist_unlink ( struct chunklist l,
struct chunk p 
)

Definition at line 146 of file nbd-tester-client.c.

                                                              {
       if (p && l) {
              struct chunk * prev = p->prev;
              struct chunk * next = p->next;
              
              /* Fix link to previous */
              if (prev)
                     prev->next = next;
              else
                     l->head = next;
              
              if (next)
                     next->prev = prev;
              else
                     l->tail = prev;

              p->prev = NULL;
              p->next = NULL;
              l->numitems--;
       }                                                
}                                                              

Here is the caller graph for this function:

int close_connection ( int  sock,
CLOSE_TYPE  type 
)

Definition at line 422 of file nbd-tester-client.c.

                                                {
       struct nbd_request req;
       u64 counter=0;

       switch(type) {
              case CONNECTION_CLOSE_PROPERLY:
                     req.magic=htonl(NBD_REQUEST_MAGIC);
                     req.type=htonl(NBD_CMD_DISC);
                     memcpy(&(req.handle), &(counter), sizeof(counter));
                     counter++;
                     req.from=0;
                     req.len=0;
                     if(write(sock, &req, sizeof(req))<0) {
                            snprintf(errstr, errstr_len, "Could not write to socket: %s", strerror(errno));
                            return -1;
                     }
              case CONNECTION_CLOSE_FAST:
                     if(close(sock)<0) {
                            snprintf(errstr, errstr_len, "Could not close socket: %s", strerror(errno));
                            return -1;
                     }
                     break;
              default:
                     g_critical("Your compiler is on crack!"); /* or I am buggy */
                     return -1;
       }
       return 0;
}

Here is the caller graph for this function:

static void dumpcommand ( char *  text,
uint32_t  command 
) [inline, static]

Definition at line 723 of file nbd-tester-client.c.

{
#ifdef DEBUG_COMMANDS
       command=ntohl(command);
       char * ctext;
       switch (command & NBD_CMD_MASK_COMMAND) {
       case NBD_CMD_READ:
              ctext="NBD_CMD_READ";
              break;
       case NBD_CMD_WRITE:
              ctext="NBD_CMD_WRITE";
              break;
       case NBD_CMD_DISC:
              ctext="NBD_CMD_DISC";
              break;
       case NBD_CMD_FLUSH:
              ctext="NBD_CMD_FLUSH";
              break;
       default:
              ctext="UNKNOWN";
              break;
       }
       printf("%s: %s [%s] (0x%08x)\n",
              text,
              ctext,
              (command & NBD_CMD_FLAG_FUA)?"FUA":"NONE",
              command);
#endif
}

Here is the caller graph for this function:

uint64_t getrandomhandle ( GHashTable *  phash)

Definition at line 754 of file nbd-tester-client.c.

                                            {
       uint64_t handle = 0;
       int i;
       do {
              /* RAND_MAX may be as low as 2^15 */
              for (i= 1 ; i<=5; i++)
                     handle ^= random() ^ (handle << 15); 
       } while (g_hash_table_lookup(phash, &handle));
       return handle;
}

Here is the caller graph for this function:

int integrity_test ( gchar *  hostname,
int  port,
char *  name,
int  sock,
char  sock_is_open,
char  close_sock,
int  testflags 
)

Definition at line 765 of file nbd-tester-client.c.

                                                                    {
       struct nbd_reply rep;
       fd_set rset;
       fd_set wset;
       struct timeval tv;
       struct timeval start;
       struct timeval stop;
       double timespan;
       double speed;
       char speedchar[2] = { '\0', '\0' };
       int retval=0;
       int serverflags = 0;
       pid_t G_GNUC_UNUSED mypid = getpid();
       int blkhashfd = -1;
       char *blkhashname=NULL;
       struct blkitem *blkhash = NULL;
       int logfd=-1;
       uint64_t seq=1;
       uint64_t processed=0;
       uint64_t printer=0;
       uint64_t xfer=0;
       int readtransactionfile = 1;
       int blocked = 0;
       struct rclist txqueue={NULL, NULL, 0};
       struct rclist inflight={NULL, NULL, 0};
       struct chunklist txbuf={NULL, NULL, 0};

       GHashTable *handlehash = g_hash_table_new(g_int64_hash, g_int64_equal);

       size=0;
       if(!sock_is_open) {
              if((sock=setup_connection(hostname, port, name, CONNECTION_TYPE_FULL, &serverflags))<0) {
                     g_warning("Could not open socket: %s", errstr);
                     retval=-1;
                     goto err;
              }
       }

       if ((serverflags & (NBD_FLAG_SEND_FLUSH | NBD_FLAG_SEND_FUA))
           != (NBD_FLAG_SEND_FLUSH | NBD_FLAG_SEND_FUA))
              g_warning("Server flags do not support FLUSH and FUA - these may error");

#ifdef HAVE_MKSTEMP
       blkhashname=strdup("/tmp/blkarray-XXXXXX");
       if (!blkhashname || (-1 == (blkhashfd = mkstemp(blkhashname)))) {
              g_warning("Could not open temp file: %s", strerror(errno));
              retval=-1;
              goto err;
       }
#else
       /* use tmpnam here to avoid further feature test nightmare */
       if (-1 == (blkhashfd = open(blkhashname=strdup(tmpnam(NULL)),
                                O_CREAT | O_RDWR,
                                S_IRUSR|S_IWUSR|S_IRGRP|S_IROTH))) {
              g_warning("Could not open temp file: %s", strerror(errno));
              retval=-1;
              goto err;
       }
#endif
       /* Ensure space freed if we die */
       if (-1 == unlink(blkhashname)) {
              g_warning("Could not unlink temp file: %s", strerror(errno));
              retval=-1;
              goto err;
       }

       if (-1 == lseek(blkhashfd, (off_t)((size>>9)*sizeof(struct blkitem)), SEEK_SET)) {
              g_warning("Could not llseek temp file: %s", strerror(errno));
              retval=-1;
              goto err;
       }

       if (-1 == write(blkhashfd, "\0", 1)) {
              g_warning("Could not write temp file: %s", strerror(errno));
              retval=-1;
              goto err;
       }

       if (NULL == (blkhash = mmap(NULL,
                                (size>>9)*sizeof(struct blkitem),
                                PROT_READ | PROT_WRITE,
                                MAP_SHARED,
                                blkhashfd,
                                0))) {
              g_warning("Could not mmap temp file: %s", strerror(errno));
              retval=-1;
              goto err;
       }

       if (-1 == (logfd = open(transactionlog, O_RDONLY)))
       {
              g_warning("Could open log file: %s", strerror(errno));
              retval=-1;
              goto err;
       }
              
       if(gettimeofday(&start, NULL)<0) {
              retval=-1;
              snprintf(errstr, errstr_len, "Could not measure start time: %s", strerror(errno));
              goto err_open;
       }

       while (readtransactionfile || txqueue.numitems || txbuf.numitems || inflight.numitems) {
              int ret;

              uint32_t magic;
                uint32_t command;
                uint64_t from;
                uint32_t len;
              struct reqcontext * prc;

              *errstr=0;

              FD_ZERO(&wset);
              FD_ZERO(&rset);
              if (readtransactionfile)
                     FD_SET(logfd, &rset);
              if ((!blocked && txqueue.numitems) || txbuf.numitems)
                     FD_SET(sock, &wset);
              if (inflight.numitems)
                     FD_SET(sock, &rset);
              tv.tv_sec=5;
              tv.tv_usec=0;
              ret = select(1+((sock>logfd)?sock:logfd), &rset, &wset, NULL, &tv);
              if (ret == 0) {
                     retval=-1;
                     snprintf(errstr, errstr_len, "Timeout reading from socket");
                     goto err_open;
              } else if (ret<0) {
                     g_warning("Could not mmap temp file: %s", errstr);
                     retval=-1;
                     goto err;
              }
              /* We know we've got at least one thing to do here then */

              /* Get a command from the transaction log */
              if (FD_ISSET(logfd, &rset)) {
                     
                     /* Read a request or reply from the transaction file */
                     READ_ALL_ERRCHK(logfd,
                                   &magic,
                                   sizeof(magic),
                                   err_open,
                                   "Could not read transaction log: %s",
                                   strerror(errno));
                     magic = ntohl(magic);
                     switch (magic) {
                     case NBD_REQUEST_MAGIC:
                            if (NULL == (prc = calloc(1, sizeof(struct reqcontext)))) {
                                   retval=-1;
                                   snprintf(errstr, errstr_len, "Could not allocate request");
                                   goto err_open;
                            }
                            READ_ALL_ERRCHK(logfd,
                                          sizeof(magic)+(char *)&(prc->req),
                                          sizeof(struct nbd_request)-sizeof(magic),
                                          err_open,
                                          "Could not read transaction log: %s",
                                          strerror(errno));
                            prc->req.magic = htonl(NBD_REQUEST_MAGIC);
                            memcpy(prc->orighandle, prc->req.handle, 8);
                            prc->seq=seq++;
                            if ((ntohl(prc->req.type) & NBD_CMD_MASK_COMMAND) == NBD_CMD_DISC) {
                                   /* no more to read; don't enqueue as no reply
                                    * we will disconnect manually at the end
                                    */
                                   readtransactionfile = 0;
                                   free (prc);
                            } else {
                                   dumpcommand("Enqueuing command", prc->req.type);
                                   rclist_addtail(&txqueue, prc);
                            }
                            prc = NULL;
                            break;
                     case NBD_REPLY_MAGIC:
                            READ_ALL_ERRCHK(logfd,
                                          sizeof(magic)+(char *)(&rep),
                                          sizeof(struct nbd_reply)-sizeof(magic),
                                          err_open,
                                          "Could not read transaction log: %s",
                                          strerror(errno));

                            if (rep.error) {
                                   retval=-1;
                                   snprintf(errstr, errstr_len, "Transaction log file contained errored transaction");
                                   goto err_open;
                            }
                                   
                            /* We do not need to consume data on a read reply as there is
                             * none in the log */
                            break;
                     default:
                            retval=-1;
                            snprintf(errstr, errstr_len, "Could not measure start time: %08x", magic);
                            goto err_open;
                     }
              }

              /* See if we have a write we can do */
              if (FD_ISSET(sock, &wset))
              {
                     if ((!(txqueue.head) && !(txbuf.head)) || blocked)
                            g_warning("Socket write FD set but we shouldn't have been interested");

                     /* If there is no buffered data, generate some */
                     if (!blocked && !(txbuf.head) && (NULL != (prc = txqueue.head)))
                     {
                            if (ntohl(prc->req.magic) != NBD_REQUEST_MAGIC) {
                                   retval=-1;
                                   g_warning("Asked to write a request without a magic number");
                                   goto err_open;
                            }
                                   
                            command = ntohl(prc->req.type);
                            from = ntohll(prc->req.from);
                            len = ntohl(prc->req.len);

                            /* First check whether we can touch this command at all. If this
                             * command is a read, and there is an inflight write, OR if this
                             * command is a write, and there is an inflight read or write, then
                             * we need to leave the command alone and signal that we are blocked
                             */
                            
                            if (!looseordering)
                            {
                                   uint64_t cfrom;
                                   uint32_t clen;
                                   cfrom = from;
                                   clen = len;
                                   while (clen > 0) {
                                          uint64_t blknum = cfrom>>9;
                                          if (cfrom>=size) {
                                                 snprintf(errstr, errstr_len, "offset %llx beyond size %llx",
                                                         (long long int) cfrom, (long long int)size);
                                                 goto err_open;
                                          }
                                          if (blkhash[blknum].inflightw ||
                                              (blkhash[blknum].inflightr &&
                                               ((command & NBD_CMD_MASK_COMMAND)==NBD_CMD_WRITE))) {
                                                 blocked=1;
                                                 break;
                                          }
                                          cfrom += 512;
                                          clen -= 512;
                                   }
                            }

                            if (blocked)
                                   goto skipdequeue;

                            rclist_unlink(&txqueue, prc);
                            rclist_addtail(&inflight, prc);
                            
                            dumpcommand("Sending command", prc->req.type);
                            /* we rewrite the handle as they otherwise may not be unique */
                            *((uint64_t*)(prc->req.handle))=getrandomhandle(handlehash);
                            g_hash_table_insert(handlehash, prc->req.handle, prc);
                            addbuffer(&txbuf, &(prc->req), sizeof(struct nbd_request));
                            switch (command & NBD_CMD_MASK_COMMAND) {
                            case NBD_CMD_WRITE:
                                   xfer+=len;
                                   while (len > 0)      {
                                          uint64_t blknum = from>>9;
                                          char dbuf[512];
                                          if (from>=size) {
                                                 snprintf(errstr, errstr_len, "offset %llx beyond size %llx",
                                                         (long long int) from, (long long int)size);
                                                 goto err_open;
                                          }
                                          (blkhash[blknum].inflightw)++;
                                          /* work out what we should be writing */
                                          makebuf(dbuf, prc->seq, blknum);
                                          addbuffer(&txbuf, dbuf, 512);
                                          from += 512;
                                          len -= 512;
                                   }
                                   break;
                            case NBD_CMD_READ:
                                   xfer+=len;
                                   while (len > 0)      {
                                          uint64_t blknum = from>>9;
                                          if (from>=size) {
                                                 snprintf(errstr, errstr_len, "offset %llx beyond size %llx",
                                                         (long long int) from, (long long int)size);
                                                 goto err_open;
                                          }
                                          (blkhash[blknum].inflightr)++;
                                          from += 512;
                                          len -= 512;
                                   }
                                   break;
                            case NBD_CMD_DISC:
                            case NBD_CMD_FLUSH:
                                   break;
                            default:
                                   retval=-1;
                                   snprintf(errstr, errstr_len, "Incomprehensible command: %08x", command);
                                   goto err_open;
                                   break;
                            }
                            
                            prc = NULL;
                     }
              skipdequeue:

                     /* there should be some now */
                     if (writebuffer(sock, &txbuf)<0) {
                            retval=-1;
                            snprintf(errstr, errstr_len, "Failed to write to socket buffer: %s", strerror(errno));
                            goto err_open;
                     }
                     
              }

              /* See if there is a reply to be processed from the socket */
              if(FD_ISSET(sock, &rset)) {
                     /* Okay, there's something ready for
                      * reading here */
                     
                     READ_ALL_ERRCHK(sock,
                                   &rep,
                                   sizeof(struct nbd_reply),
                                   err_open,
                                   "Could not read from server socket: %s",
                                   strerror(errno));
                     
                     if (rep.magic != htonl(NBD_REPLY_MAGIC)) {
                            retval=-1;
                            snprintf(errstr, errstr_len, "Bad magic from server");
                            goto err_open;
                     }
                     
                     if (rep.error) {
                            retval=-1;
                            snprintf(errstr, errstr_len, "Server errored a transaction");
                            goto err_open;
                     }
                            
                     uint64_t handle;
                     memcpy(&handle,rep.handle,8);
                     prc = g_hash_table_lookup(handlehash, &handle);
                     if (!prc) {
                            retval=-1;
                            snprintf(errstr, errstr_len, "Unrecognised handle in reply: 0x%llX", *(long long unsigned int*)(rep.handle));
                            goto err_open;
                     }
                     if (!g_hash_table_remove(handlehash, &handle)) {
                            retval=-1;
                            snprintf(errstr, errstr_len, "Could not remove handle from hash: 0x%llX", *(long long unsigned int*)(rep.handle));
                            goto err_open;
                     }

                     if (prc->req.magic != htonl(NBD_REQUEST_MAGIC)) {
                            retval=-1;
                            snprintf(errstr, errstr_len, "Bad magic in inflight data: %08x", prc->req.magic);
                            goto err_open;
                     }
                     
                     dumpcommand("Processing reply to command", prc->req.type);
                     command = ntohl(prc->req.type);
                     from = ntohll(prc->req.from);
                     len = ntohl(prc->req.len);
                     
                     switch (command & NBD_CMD_MASK_COMMAND) {
                     case NBD_CMD_READ:
                            while (len > 0)      {
                                   uint64_t blknum = from>>9;
                                   char dbuf[512];
                                   if (from>=size) {
                                          snprintf(errstr, errstr_len, "offset %llx beyond size %llx",
                                                  (long long int) from, (long long int)size);
                                          goto err_open;
                                   }
                                   READ_ALL_ERRCHK(sock,
                                                 dbuf,
                                                 512,
                                                 err_open,
                                                 "Could not read data: %s",
                                                 strerror(errno));
                                   if (--(blkhash[blknum].inflightr) <0 ) {
                                          snprintf(errstr, errstr_len, "Received a read reply for offset %llx when not in flight",
                                                  (long long int) from);
                                          goto err_open;
                                   }
                                   /* work out what we was written */
                                   if (checkbuf(dbuf, blkhash[blknum].seq, blknum)) {
                                          retval=-1;
                                          snprintf(errstr, errstr_len, "Bad reply data: I wanted blk %08x, seq %08x but I got (at a guess) blk %08x, seq %08x",
                                                  (unsigned int) blknum,
                                                  blkhash[blknum].seq,
                                                  ((uint32_t *)(dbuf))[0],
                                                  ((uint32_t *)(dbuf))[1]
                                                  );
                                          goto err_open;
                                          
                                   }
                                   from += 512;
                                   len -= 512;
                            }
                            break;
                     case NBD_CMD_WRITE:
                            /* subsequent reads should get data with this seq*/
                            while (len > 0)      {
                                   uint64_t blknum = from>>9;
                                   if (--(blkhash[blknum].inflightw) <0 ) {
                                          snprintf(errstr, errstr_len, "Received a write reply for offset %llx when not in flight",
                                                  (long long int) from);
                                          goto err_open;
                                   }
                                   blkhash[blknum].seq=(uint32_t)(prc->seq);
                                   from += 512;
                                   len -= 512;
                            }
                            break;
                     default:
                            break;
                     }
                     blocked = 0;
                     processed++;
                     rclist_unlink(&inflight, prc);
                     prc->req.magic=0; /* so a duplicate reply is detected */
                     free(prc);
              }

              if (!(printer++ % 1000) || !(readtransactionfile || txqueue.numitems || inflight.numitems) )
                     printf("%d: Seq %08lld Queued: %08d Inflight: %08d Done: %08lld\r",
                            (int)mypid,
                            (long long int) seq,
                            txqueue.numitems,
                            inflight.numitems,
                            (long long int) processed);

       }

       printf("\n");

       if (gettimeofday(&stop, NULL)<0) {
              retval=-1;
              snprintf(errstr, errstr_len, "Could not measure end time: %s", strerror(errno));
              goto err_open;
       }
       timespan=timeval_diff_to_double(&stop, &start);
       speed=xfer/timespan;
       if(speed>1024) {
              speed=speed/1024.0;
              speedchar[0]='K';
       }
       if(speed>1024) {
              speed=speed/1024.0;
              speedchar[0]='M';
       }
       if(speed>1024) {
              speed=speed/1024.0;
              speedchar[0]='G';
       }
       g_message("%d: Integrity %s test complete. Took %.3f seconds to complete, %.3f%sib/s", (int)getpid(), (testflags & TEST_WRITE)?"write":"read", timespan, speed, speedchar);

err_open:
       if(close_sock) {
              close_connection(sock, CONNECTION_CLOSE_PROPERLY);
       }
err:
       if (size && blkhash)
              munmap(blkhash, (size>>9)*sizeof(struct blkitem));

       if (blkhashfd != -1)
              close (blkhashfd);

       if (logfd != -1)
              close (logfd);

       if (blkhashname)
              free(blkhashname);

       if (*errstr)
              g_warning("%s",errstr);

       g_hash_table_destroy(handlehash);

       return retval;
}

Here is the call graph for this function:

Here is the caller graph for this function:

int main ( int  argc,
char **  argv 
)

Definition at line 1250 of file nbd-tester-client.c.

                               {
       gchar *hostname;
       long int p = 0;
       char* name = NULL;
       int sock=0;
       int c;
       int nonopt=0;
       int testflags=0;
       testfunc test = throughput_test;

       /* Ignore SIGPIPE as we want to pick up the error from write() */
       signal (SIGPIPE, SIG_IGN);

       if(argc<3) {
              g_message("%d: Not enough arguments", (int)getpid());
              g_message("%d: Usage: %s <hostname> <port>", (int)getpid(), argv[0]);
              g_message("%d: Or: %s <hostname> -N <exportname> [<port>]", (int)getpid(), argv[0]);
              exit(EXIT_FAILURE);
       }
       logging();
       while((c=getopt(argc, argv, "-N:t:owfil"))>=0) {
              switch(c) {
                     case 1:
                            switch(nonopt) {
                                   case 0:
                                          hostname=g_strdup(optarg);
                                          nonopt++;
                                          break;
                                   case 1:
                                          p=(strtol(argv[2], NULL, 0));
                                          if(p==LONG_MIN||p==LONG_MAX) {
                                                 g_critical("Could not parse port number: %s", strerror(errno));
                                                 exit(EXIT_FAILURE);
                                          }
                                          break;
                            }
                            break;
                     case 'N':
                            name=g_strdup(optarg);
                            if(!p) {
                                   p = 10809;
                            }
                            break;
                     case 't':
                            transactionlog=g_strdup(optarg);
                            break;
                     case 'o':
                            test=oversize_test;
                            break;
                     case 'l':
                            looseordering=1;
                            break;
                     case 'w':
                            testflags|=TEST_WRITE;
                            break;
                     case 'f':
                            testflags|=TEST_FLUSH;
                            break;
                     case 'i':
                            test=integrity_test;
                            break;
              }
       }

       if(test(hostname, (int)p, name, sock, FALSE, TRUE, testflags)<0) {
              g_warning("Could not run test: %s", errstr);
              exit(EXIT_FAILURE);
       }

       return 0;
}

Here is the call graph for this function:

static void makebuf ( char *  buf,
uint64_t  seq,
uint64_t  blknum 
) [inline, static]

Definition at line 700 of file nbd-tester-client.c.

                                                                     {
       uint64_t x = ((uint64_t)blknum) ^ (seq << 32) ^ (seq >> 32);
       uint64_t* p = (uint64_t*)buf;
       int i;
       if (!seq) {
              bzero(buf, 512);
              return;
       }
       for (i = 0; i<512/sizeof(uint64_t); i++) {
              int s;
              *(p++) = x;
              x+=0xFEEDA1ECDEADBEEFULL+i+(((uint64_t)i)<<56);
              s = x & 63;
              x = x ^ (x<<s) ^ (x>>(64-s)) ^ 0xAA55AA55AA55AA55ULL ^ seq;
       }
}

Here is the caller graph for this function:

int oversize_test ( gchar *  hostname,
int  port,
char *  name,
int  sock,
char  sock_is_open,
char  close_sock,
int  testflags 
)

Definition at line 476 of file nbd-tester-client.c.

                                                                   {
       int retval=0;
       struct nbd_request req;
       struct nbd_reply rep;
       int i=0;
       int serverflags = 0;
       pid_t G_GNUC_UNUSED mypid = getpid();
       char buf[((1024*1024)+sizeof(struct nbd_request)/2)<<1];
       bool got_err;

       /* This should work */
       if(!sock_is_open) {
              if((sock=setup_connection(hostname, port, name, CONNECTION_TYPE_FULL, &serverflags))<0) {
                     g_warning("Could not open socket: %s", errstr);
                     retval=-1;
                     goto err;
              }
       }
       req.magic=htonl(NBD_REQUEST_MAGIC);
       req.type=htonl(NBD_CMD_READ);
       req.len=htonl(1024*1024);
       memcpy(&(req.handle),&i,sizeof(i));
       req.from=htonll(i);
       WRITE_ALL_ERR_RT(sock, &req, sizeof(req), err, -1, "Could not write request: %s", strerror(errno));
       printf("%d: testing oversized request: %d: ", getpid(), ntohl(req.len));
       READ_ALL_ERR_RT(sock, &rep, sizeof(struct nbd_reply), err, -1, "Could not read reply header: %s", strerror(errno));
       READ_ALL_ERR_RT(sock, &buf, ntohl(req.len), err, -1, "Could not read data: %s", strerror(errno));
       if(rep.error) {
              snprintf(errstr, errstr_len, "Received unexpected error: %d", rep.error);
              retval=-1;
              goto err;
       } else {
              printf("OK\n");
       }
       /* This probably should not work */
       i++; req.from=htonll(i);
       req.len = htonl(ntohl(req.len) + sizeof(struct nbd_request) / 2);
       WRITE_ALL_ERR_RT(sock, &req, sizeof(req), err, -1, "Could not write request: %s", strerror(errno));
       printf("%d: testing oversized request: %d: ", getpid(), ntohl(req.len));
       READ_ALL_ERR_RT(sock, &rep, sizeof(struct nbd_reply), err, -1, "Could not read reply header: %s", strerror(errno));
       READ_ALL_ERR_RT(sock, &buf, ntohl(req.len), err, -1, "Could not read data: %s", strerror(errno));
       if(rep.error) {
              printf("Received expected error\n");
              got_err=true;
       } else {
              printf("OK\n");
              got_err=false;
       }
       /* ... unless this works, too */
       i++; req.from=htonll(i);
       req.len = htonl(ntohl(req.len) << 1);
       WRITE_ALL_ERR_RT(sock, &req, sizeof(req), err, -1, "Could not write request: %s", strerror(errno));
       printf("%d: testing oversized request: %d: ", getpid(), ntohl(req.len));
       READ_ALL_ERR_RT(sock, &rep, sizeof(struct nbd_reply), err, -1, "Could not read reply header: %s", strerror(errno));
       READ_ALL_ERR_RT(sock, &buf, ntohl(req.len), err, -1, "Could not read data: %s", strerror(errno));
       if(rep.error) {
              printf("error\n");
       } else {
              printf("OK\n");
       }
       if((rep.error && !got_err) || (!rep.error && got_err)) {
              printf("Received unexpected error\n");
              retval=-1;
       }
  err:
       return retval;
}

Here is the call graph for this function:

Here is the caller graph for this function:

void rclist_addtail ( struct rclist l,
struct reqcontext p 
)

Definition at line 125 of file nbd-tester-client.c.

                                                              {
       if (!p || !l)
              return;
       if (l->tail) {
              if (l->tail->next)
                     g_warning("addtail found list tail has a next pointer");
              l->tail->next = p;
              p->next = NULL;
              p->prev = l->tail;
              l->tail = p;
       } else {
              if (l->head)
                     g_warning("addtail found no list tail but a list head");
              l->head = p;
              l->tail = p;
              p->prev = NULL;
              p->next = NULL;
       }
       l->numitems++;
}

Here is the caller graph for this function:

void rclist_unlink ( struct rclist l,
struct reqcontext p 
)

Definition at line 102 of file nbd-tester-client.c.

                                                             {
       if (p && l) {
              struct reqcontext * prev = p->prev;
              struct reqcontext * next = p->next;
              
              /* Fix link to previous */
              if (prev)
                     prev->next = next;
              else
                     l->head = next;
              
              if (next)
                     next->prev = prev;
              else
                     l->tail = prev;

              p->prev = NULL;
              p->next = NULL;
              l->numitems--;
       }                                                
}                                                              

Here is the caller graph for this function:

static int read_all ( int  f,
void *  buf,
size_t  len 
) [inline, static]

Definition at line 296 of file nbd-tester-client.c.

                                                         {
       ssize_t res;
       size_t retval=0;

       while(len>0) {
              if((res=read(f, buf, len)) <=0) {
                     if (!res)
                            errno=EAGAIN;
                     snprintf(errstr, errstr_len, "Read failed: %s", strerror(errno));
                     return -1;
              }
              len-=res;
              buf+=res;
              retval+=res;
       }
       return retval;
}
int read_packet_check_header ( int  sock,
size_t  datasize,
long long int  curhandle 
)

Definition at line 451 of file nbd-tester-client.c.

                                                                                 {
       struct nbd_reply rep;
       int retval=0;
       char buf[datasize];

       READ_ALL_ERR_RT(sock, &rep, sizeof(rep), end, -1, "Could not read reply header: %s", strerror(errno));
       rep.magic=ntohl(rep.magic);
       rep.error=ntohl(rep.error);
       if(rep.magic!=NBD_REPLY_MAGIC) {
              snprintf(errstr, errstr_len, "Received package with incorrect reply_magic. Index of sent packages is %lld (0x%llX), received handle is %lld (0x%llX). Received magic 0x%lX, expected 0x%lX", (long long int)curhandle, (long long unsigned int)curhandle, (long long int)*((u64*)rep.handle), (long long unsigned int)*((u64*)rep.handle), (long unsigned int)rep.magic, (long unsigned int)NBD_REPLY_MAGIC);
              retval=-1;
              goto end;
       }
       if(rep.error) {
              snprintf(errstr, errstr_len, "Received error from server: %ld (0x%lX). Handle is %lld (0x%llX).", (long int)rep.error, (long unsigned int)rep.error, (long long int)(*((u64*)rep.handle)), (long long unsigned int)*((u64*)rep.handle));
              retval=-1;
              goto end;
       }
       if (datasize)
              READ_ALL_ERR_RT(sock, &buf, datasize, end, -1, "Could not read data: %s", strerror(errno));

end:
       return retval;
}

Here is the caller graph for this function:

int setup_connection ( gchar *  hostname,
int  port,
gchar *  name,
CONNECTION_TYPE  ctype,
int *  serverflags 
)

Definition at line 338 of file nbd-tester-client.c.

                                                                                                      {
       int sock;
       struct hostent *host;
       struct sockaddr_in addr;
       char buf[256];
       uint64_t mymagic = (name ? opts_magic : cliserv_magic);
       u64 tmp64;
       uint32_t tmp32 = 0;

       sock=0;
       if(ctype<CONNECTION_TYPE_CONNECT)
              goto end;
       if((sock=socket(PF_INET, SOCK_STREAM, IPPROTO_TCP))<0) {
              strncpy(errstr, strerror(errno), errstr_len);
              goto err;
       }
       setmysockopt(sock);
       if(!(host=gethostbyname(hostname))) {
              strncpy(errstr, strerror(errno), errstr_len);
              goto err_open;
       }
       addr.sin_family=AF_INET;
       addr.sin_port=htons(port);
       addr.sin_addr.s_addr=*((int *) host->h_addr);
       if((connect(sock, (struct sockaddr *)&addr, sizeof(addr))<0)) {
              strncpy(errstr, strerror(errno), errstr_len);
              goto err_open;
       }
       if(ctype<CONNECTION_TYPE_INIT_PASSWD)
              goto end;
       READ_ALL_ERRCHK(sock, buf, strlen(INIT_PASSWD), err_open, "Could not read INIT_PASSWD: %s", strerror(errno));
       if(strlen(buf)==0) {
              snprintf(errstr, errstr_len, "Server closed connection");
              goto err_open;
       }
       if(strncmp(buf, INIT_PASSWD, strlen(INIT_PASSWD))) {
              snprintf(errstr, errstr_len, "INIT_PASSWD does not match");
              goto err_open;
       }
       if(ctype<CONNECTION_TYPE_CLISERV)
              goto end;
       READ_ALL_ERRCHK(sock, &tmp64, sizeof(tmp64), err_open, "Could not read cliserv_magic: %s", strerror(errno));
       tmp64=ntohll(tmp64);
       if(tmp64 != mymagic) {
              strncpy(errstr, "mymagic does not match", errstr_len);
              goto err_open;
       }
       if(ctype<CONNECTION_TYPE_FULL)
              goto end;
       if(!name) {
              READ_ALL_ERRCHK(sock, &size, sizeof(size), err_open, "Could not read size: %s", strerror(errno));
              size=ntohll(size);
              READ_ALL_ERRCHK(sock, buf, 128, err_open, "Could not read data: %s", strerror(errno));
              goto end;
       }
       /* flags */
       READ_ALL_ERRCHK(sock, buf, sizeof(uint16_t), err_open, "Could not read reserved field: %s", strerror(errno));
       /* reserved field */
       WRITE_ALL_ERRCHK(sock, &tmp32, sizeof(tmp32), err_open, "Could not write reserved field: %s", strerror(errno));
       /* magic */
       tmp64 = htonll(opts_magic);
       WRITE_ALL_ERRCHK(sock, &tmp64, sizeof(tmp64), err_open, "Could not write magic: %s", strerror(errno));
       /* name */
       tmp32 = htonl(NBD_OPT_EXPORT_NAME);
       WRITE_ALL_ERRCHK(sock, &tmp32, sizeof(tmp32), err_open, "Could not write option: %s", strerror(errno));
       tmp32 = htonl((uint32_t)strlen(name));
       WRITE_ALL_ERRCHK(sock, &tmp32, sizeof(tmp32), err_open, "Could not write name length: %s", strerror(errno));
       WRITE_ALL_ERRCHK(sock, name, strlen(name), err_open, "Could not write name:: %s", strerror(errno));
       READ_ALL_ERRCHK(sock, &size, sizeof(size), err_open, "Could not read size: %s", strerror(errno));
       size = ntohll(size);
       uint16_t flags;
       READ_ALL_ERRCHK(sock, &flags, sizeof(uint16_t), err_open, "Could not read flags: %s", strerror(errno));
       flags = ntohs(flags);
       *serverflags = flags;
       READ_ALL_ERRCHK(sock, buf, 124, err_open, "Could not read reserved zeroes: %s", strerror(errno));
       goto end;
err_open:
       close(sock);
err:
       sock=-1;
end:
       return sock;
}

Here is the call graph for this function:

Here is the caller graph for this function:

int throughput_test ( gchar *  hostname,
int  port,
char *  name,
int  sock,
char  sock_is_open,
char  close_sock,
int  testflags 
)

Definition at line 545 of file nbd-tester-client.c.

                                                                     {
       long long int i;
       char writebuf[1024];
       struct nbd_request req;
       int requests=0;
       fd_set set;
       struct timeval tv;
       struct timeval start;
       struct timeval stop;
       double timespan;
       double speed;
       char speedchar[2] = { '\0', '\0' };
       int retval=0;
       int serverflags = 0;
       signed int do_write=TRUE;
       pid_t mypid = getpid();


       if (!(testflags & TEST_WRITE))
              testflags &= ~TEST_FLUSH;

       memset (writebuf, 'X', 1024);
       size=0;
       if(!sock_is_open) {
              if((sock=setup_connection(hostname, port, name, CONNECTION_TYPE_FULL, &serverflags))<0) {
                     g_warning("Could not open socket: %s", errstr);
                     retval=-1;
                     goto err;
              }
       }
       if ((testflags & TEST_FLUSH) && ((serverflags & (NBD_FLAG_SEND_FLUSH | NBD_FLAG_SEND_FUA))
                                    != (NBD_FLAG_SEND_FLUSH | NBD_FLAG_SEND_FUA))) {
              snprintf(errstr, errstr_len, "Server did not supply flush capability flags");
              retval = -1;
              goto err_open;
       }
       req.magic=htonl(NBD_REQUEST_MAGIC);
       req.len=htonl(1024);
       if(gettimeofday(&start, NULL)<0) {
              retval=-1;
              snprintf(errstr, errstr_len, "Could not measure start time: %s", strerror(errno));
              goto err_open;
       }
       for(i=0;i+1024<=size;i+=1024) {
              if(do_write) {
                     int sendfua = (testflags & TEST_FLUSH) && (((i>>10) & 15) == 3);
                     int sendflush = (testflags & TEST_FLUSH) && (((i>>10) & 15) == 11);
                     req.type=htonl((testflags & TEST_WRITE)?NBD_CMD_WRITE:NBD_CMD_READ);
                     if (sendfua)
                            req.type = htonl(NBD_CMD_WRITE | NBD_CMD_FLAG_FUA);
                     memcpy(&(req.handle),&i,sizeof(i));
                     req.from=htonll(i);
                     if (write_all(sock, &req, sizeof(req)) <0) {
                            retval=-1;
                            goto err_open;
                     }
                     if (testflags & TEST_WRITE) {
                            if (write_all(sock, writebuf, 1024) <0) {
                                   retval=-1;
                                   goto err_open;
                            }
                     }
                     printf("%d: Requests(+): %d\r", (int)mypid, ++requests);
                     if (sendflush) {
                            long long int j = i ^ (1LL<<63);
                            req.type = htonl(NBD_CMD_FLUSH);
                            memcpy(&(req.handle),&j,sizeof(j));
                            req.from=0;
                            if (write_all(sock, &req, sizeof(req)) <0) {
                                   retval=-1;
                                   goto err_open;
                            }
                            printf("%d: Requests(+): %d\r", (int)mypid, ++requests);
                     }
              }
              do {
                     FD_ZERO(&set);
                     FD_SET(sock, &set);
                     tv.tv_sec=0;
                     tv.tv_usec=0;
                     select(sock+1, &set, NULL, NULL, &tv);
                     if(FD_ISSET(sock, &set)) {
                            /* Okay, there's something ready for
                             * reading here */
                            if(read_packet_check_header(sock, (testflags & TEST_WRITE)?0:1024, i)<0) {
                                   retval=-1;
                                   goto err_open;
                            }
                            printf("%d: Requests(-): %d\r", (int)mypid, --requests);
                     }
              } while FD_ISSET(sock, &set);
              /* Now wait until we can write again or until a second have
               * passed, whichever comes first*/
              FD_ZERO(&set);
              FD_SET(sock, &set);
              tv.tv_sec=1;
              tv.tv_usec=0;
              do_write=select(sock+1,NULL,&set,NULL,&tv);
              if(!do_write) printf("Select finished\n");
              if(do_write<0) {
                     snprintf(errstr, errstr_len, "select: %s", strerror(errno));
                     retval=-1;
                     goto err_open;
              }
       }
       /* Now empty the read buffer */
       do {
              FD_ZERO(&set);
              FD_SET(sock, &set);
              tv.tv_sec=0;
              tv.tv_usec=0;
              select(sock+1, &set, NULL, NULL, &tv);
              if(FD_ISSET(sock, &set)) {
                     /* Okay, there's something ready for
                      * reading here */
                     read_packet_check_header(sock, (testflags & TEST_WRITE)?0:1024, i);
                     printf("%d: Requests(-): %d\r", (int)mypid, --requests);
              }
       } while (requests);
       printf("\n");
       if(gettimeofday(&stop, NULL)<0) {
              retval=-1;
              snprintf(errstr, errstr_len, "Could not measure end time: %s", strerror(errno));
              goto err_open;
       }
       timespan=timeval_diff_to_double(&stop, &start);
       speed=size/timespan;
       if(speed>1024) {
              speed=speed/1024.0;
              speedchar[0]='K';
       }
       if(speed>1024) {
              speed=speed/1024.0;
              speedchar[0]='M';
       }
       if(speed>1024) {
              speed=speed/1024.0;
              speedchar[0]='G';
       }
       g_message("%d: Throughput %s test (%s flushes) complete. Took %.3f seconds to complete, %.3f%sib/s", (int)getpid(), (testflags & TEST_WRITE)?"write":"read", (testflags & TEST_FLUSH)?"with":"without", timespan, speed, speedchar);

err_open:
       if(close_sock) {
              close_connection(sock, CONNECTION_CLOSE_PROPERLY);
       }
err:
       return retval;
}

Here is the call graph for this function:

Here is the caller graph for this function:

double timeval_diff_to_double ( struct timeval *  x,
struct timeval *  y 
)

Definition at line 290 of file nbd-tester-client.c.

                                                                       {
       struct timeval r;
       timeval_subtract(&r, x, y);
       return r.tv_sec * 1.0 + r.tv_usec/1000000.0;
}

Here is the call graph for this function:

Here is the caller graph for this function:

int timeval_subtract ( struct timeval *  result,
struct timeval *  x,
struct timeval *  y 
)

Definition at line 270 of file nbd-tester-client.c.

                                       {
       if (x->tv_usec < y->tv_usec) {
              int nsec = (y->tv_usec - x->tv_usec) / 1000000 + 1;
              y->tv_usec -= 1000000 * nsec;
              y->tv_sec += nsec;
       }
       
       if (x->tv_usec - y->tv_usec > 1000000) {
              int nsec = (x->tv_usec - y->tv_usec) / 1000000;
              y->tv_usec += 1000000 * nsec;
              y->tv_sec -= nsec;
       }
       
       result->tv_sec = x->tv_sec - y->tv_sec;
       result->tv_usec = x->tv_usec - y->tv_usec;
       
       return x->tv_sec < y->tv_sec;
}

Here is the caller graph for this function:

static int write_all ( int  f,
void *  buf,
size_t  len 
) [inline, static]

Definition at line 314 of file nbd-tester-client.c.

                                                          {
       ssize_t res;
       size_t retval=0;

       while(len>0) {
              if((res=write(f, buf, len)) <=0) {
                     if (!res)
                            errno=EAGAIN;
                     snprintf(errstr, errstr_len, "Write failed: %s", strerror(errno));
                     return -1;
              }
              len-=res;
              buf+=res;
              retval+=res;
       }
       return retval;
}

Here is the caller graph for this function:

int writebuffer ( int  fd,
struct chunklist l 
)

Definition at line 229 of file nbd-tester-client.c.

                                              {

       struct chunk * pchunk = NULL;
       int res;
       if (!l)
              return 0;

       while (!pchunk)
       {
              pchunk = l->head;
              if (!pchunk)
                     return 0;
              if (!(pchunk->length) || !(pchunk->readptr)) {
                     chunklist_unlink(l, pchunk);
                     free(pchunk->buffer);
                     free(pchunk);
                     pchunk = NULL;
              }
       }
       
       /* OK we have a chunk with some data in */
       res = write(fd, pchunk->readptr, pchunk->length);
       if (res==0)
              errno = EAGAIN;
       if (res<=0)
              return -1;
       pchunk->length -= res;
       pchunk->readptr += res;
       if (!pchunk->length) {
              chunklist_unlink(l, pchunk);
              free(pchunk->buffer);
              free(pchunk);
       }
       return 0;
}

Here is the call graph for this function:

Here is the caller graph for this function:


Variable Documentation

gchar errstr[1024] [static]

Definition at line 44 of file nbd-tester-client.c.

const int errstr_len = 1024 [static]

Definition at line 45 of file nbd-tester-client.c.

int looseordering = 0 [static]

Definition at line 49 of file nbd-tester-client.c.

uint64_t size [static]

Definition at line 47 of file nbd-tester-client.c.

gchar* transactionlog = "nbd-tester-client.tr" [static]

Definition at line 51 of file nbd-tester-client.c.