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/*BINFMTC: -g -DILISTCREATEBENCH
* cowdancer -- a Copy-on-write data-access; No-cow-easy-replacement
*
* Copyright 2007-2000 Junichi Uekawa
* GPL v2 or later.
*/
#include <stdlib.h>
#include <stdio.h>
#include <sys/types.h>
#include <sys/stat.h>
#include "ilist.h"
/* Output error message. You need to process the error result. */
void ilist_outofmemory(const char* msg)
{
fprintf (stderr, "E: %s: %s\n", ilist_PRGNAME, msg);
}
/* return 1 on error, 0 on success */
int ilistcreate(const char* ilistpath, const char* findcommandline)
{
int i=0;
long dev, ino;
FILE* inf;
FILE* outf;
struct ilist_struct* ilist=NULL;
struct ilist_header header=
{
ILISTSIG,
ILISTREVISION,
sizeof (struct ilist_struct),
0
};
long ilist_len=0;
if(!findcommandline)
findcommandline="find . -xdev \\( -type l -o -type f \\) -a -links +1 -print0 | xargs -0 stat --format '%d %i '";
if (!(ilist=calloc(2000,sizeof(struct ilist_struct))))
{
ilist_outofmemory("memory allocation failed");
return 1;
}
ilist_len=2000;
if (NULL==(inf=popen(findcommandline, "r")))
{
ilist_outofmemory("popen find failed");
return 1;
}
while (fscanf(inf,"%li %li", &dev, &ino)>0)
{
(ilist+i)->dev=(dev_t)dev;
(ilist+i)->inode=(ino_t)ino;
if (getenv("COWDANCER_DEBUG"))
printf("%li %li \n ", (long int)dev, (long int)ino);
i++;
if (i>=ilist_len)
{
ilist=realloc(ilist, (ilist_len*=2)*sizeof(struct ilist_struct));
if (!ilist)
{
ilist_outofmemory("realloc failed");
pclose(inf);
return 1;
}
}
}
ilist_len=i;
if (pclose(inf))
{
ilist_outofmemory("pclose returned non-zero, probably the directory contains no hardlinked file, don't bother using cow-shell here.");
return 1;
}
/* sort the ilist */
qsort(ilist, ilist_len, sizeof(struct ilist_struct), compare_ilist);
/* write out the ilist file */
if (NULL==(outf=fopen(ilistpath,"w")))
{
ilist_outofmemory("cannot open .ilist file");
return 1;
}
if(1 != fwrite(&header, sizeof(struct ilist_header), 1, outf))
{
ilist_outofmemory("failed writing header to .ilist file");
return 1;
}
if (ilist_len != fwrite(ilist, sizeof(struct ilist_struct), ilist_len, outf))
{
ilist_outofmemory("failed writing to .ilist file");
return 1;
}
if (fclose (outf))
{
ilist_outofmemory("error flushing to .ilist file");
return 1;
}
return 0;
}
/* comparison function for qsort/bsearch of ilist
*/
int
compare_ilist (const void *a, const void *b)
{
const struct ilist_struct * ilista = (const struct ilist_struct*) a;
const struct ilist_struct * ilistb = (const struct ilist_struct*) b;
int ret;
ret = ilista->inode - ilistb->inode;
if (!ret)
{
ret = ilista->dev - ilistb->dev;
}
return ret;
}
#ifdef ILISTCREATEBENCH
/* test code for performance tuning */
const char* ilist_PRGNAME="testbench";
int
main()
{
int i;
if (-1==chdir("/home/dancer/shared/git/linux-2.6/"))
exit (1);
for(i=0; i<100; ++i)
ilistcreate("/home/dancer/shared/git/linux-2.6/.ilist", NULL);
exit (0);
}
#endif
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