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lfn: short fn length is constant and accurate

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also, disabling real hashing for now
This commit is contained in:
Yehuda Sadeh 2011-04-28 11:24:50 -07:00
parent c8859f0471
commit 4b9c093c70
1 changed files with 19 additions and 8 deletions
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27
src/os/FileStore.cc
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@ -84,7 +84,7 @@
#include "common/ceph_crypto.h"
using ceph::crypto::MD5;
using ceph::crypto::SHA256;
// using ceph::crypto::SHA1;
/*
@ -98,11 +98,12 @@ using ceph::crypto::MD5;
*/
#define FILENAME_MAX_LEN 4096 // the long file name size
#define FILENAME_SHORT_LEN 32 // the short file name size
#define FILENAME_SHORT_LEN 20 // the short file name size
#define FILENAME_COOKIE "long" // ceph long file name
#define FILENAME_HASH_LEN 3
#define FILENAME_EXTRA 4 // underscores and digit
#define FILENAME_PREFIX_LEN (FILENAME_SHORT_LEN - FILENAME_HASH_LEN - 1 - (sizeof(FILENAME_COOKIE) - 1) - 1)
#define FILENAME_PREFIX_LEN (FILENAME_SHORT_LEN - FILENAME_HASH_LEN - (sizeof(FILENAME_COOKIE) - 1) - FILENAME_EXTRA)
static int do_getxattr(const char *fn, const char *name, void *val, size_t size);
static int do_setxattr(const char *fn, const char *name, const void *val, size_t size);
@ -175,16 +176,19 @@ static int hash_filename(const char *filename, char *hash, int buf_len)
{
if (buf_len < FILENAME_HASH_LEN + 1)
return -EINVAL;
char buf[CEPH_CRYPTO_MD5_DIGESTSIZE];
char hex[CEPH_CRYPTO_MD5_DIGESTSIZE * 2];
MD5 h;
#if 0
char buf[CEPH_CRYPTO_SHA256_DIGESTSIZE];
char hex[CEPH_CRYPTO_SHA256_DIGESTSIZE * 2];
SHA256 h;
h.Update((const byte *)filename, strlen(filename));
h.Final((byte *)buf);
buf_to_hex((byte *)buf, (FILENAME_HASH_LEN + 1) / 2, hex);
strncpy(hash, hex, FILENAME_HASH_LEN);
hash[FILENAME_HASH_LEN] = '\0';
#endif
memset(hash, 'z', FILENAME_HASH_LEN);
hash[FILENAME_HASH_LEN] = '\0';
return 0;
}
@ -202,7 +206,14 @@ static void build_filename(char *filename, int len, const char *old_filename, in
return;
hash_filename(old_filename, hash, sizeof(hash));
sprintf(filename + FILENAME_PREFIX_LEN, "_%s_%d_" FILENAME_COOKIE, hash, i);
int ofs = FILENAME_PREFIX_LEN;
int suffix_len;
while (1) {
suffix_len = sprintf(filename + ofs, "_%s_%d_" FILENAME_COOKIE, hash, i);
if (ofs + suffix_len <= FILENAME_SHORT_LEN || !ofs)
break;
ofs--;
}
}
/* is this a candidate? */