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#include <stdio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <signal.h>
#include <limits.h>
#include <unistd.h>
#include <errno.h>
#include <string.h>
#include <sys/stat.h>
#include <sys/types.h>
#include "int.h"
#include "file-ids.h"
#include "rbtree.h"
#include "kcmp-ids.h"
#include "common/compiler.h"
#include "image.h"
#include "util.h"
#include "irmap.h"
#include "files.h"
DECLARE_KCMP_TREE(fd_tree, KCMP_FILE);
#define FDID_BITS 5
#define FDID_SIZE (1 << FDID_BITS)
#define FDID_MASK (FDID_SIZE - 1)
static inline int fdid_hashfn(unsigned int s_dev, unsigned long i_ino)
{
return (s_dev + i_ino) & FDID_MASK;
}
struct fd_id {
int mnt_id;
unsigned int dev;
unsigned long ino;
u32 id;
struct fd_id *n;
};
static struct fd_id *fd_id_cache[FDID_SIZE];
static void fd_id_cache_one(u32 id, struct fd_parms *p)
{
struct fd_id *fi;
unsigned hv;
fi = xmalloc(sizeof(*fi));
if (fi) {
fi->dev = p->stat.st_dev;
fi->ino = p->stat.st_ino;
fi->mnt_id = p->mnt_id;
fi->id = id;
hv = fdid_hashfn(p->stat.st_dev, p->stat.st_ino);
fi->n = fd_id_cache[hv];
fd_id_cache[hv] = fi;
}
}
static struct fd_id *fd_id_cache_lookup(struct fd_parms *p)
{
struct stat *st = &p->stat;
struct fd_id *fi;
for (fi = fd_id_cache[fdid_hashfn(st->st_dev, st->st_ino)]; fi; fi = fi->n)
if (fi->dev == st->st_dev && fi->ino == st->st_ino && fi->mnt_id == p->mnt_id)
return fi;
return NULL;
}
int fd_id_generate_special(struct fd_parms *p, u32 *id)
{
if (p) {
struct fd_id *fi;
fi = fd_id_cache_lookup(p);
if (fi) {
if (p->stat.st_mode & (S_IFCHR | S_IFBLK)) {
/* Don't cache the id for mapped devices */
*id = fd_tree.subid++;
return 1;
} else {
*id = fi->id;
return 0;
}
}
}
*id = fd_tree.subid++;
if (p)
fd_id_cache_one(*id, p);
return 1;
}
int fd_id_generate(pid_t pid, FdinfoEntry *fe, struct fd_parms *p)
{
u32 id;
struct kid_elem e;
int new_id = 0;
e.pid = pid;
e.genid = fe->id;
e.idx = fe->fd;
id = kid_generate_gen(&fd_tree, &e, &new_id);
if (!id)
return -ENOMEM;
if (new_id)
fd_id_cache_one(id, p);
fe->id = id;
return new_id;
}
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