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/*
Unix SMB/CIFS implementation.
file_id structure handling
Copyright (C) Andrew Tridgell 2007
This program is free software; you can redistribute it and/or modify
it under the terms of the GNU General Public License as published by
the Free Software Foundation; either version 3 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU General Public License for more details.
You should have received a copy of the GNU General Public License
along with this program. If not, see <http://www.gnu.org/licenses/>.
*/
#include "includes.h"
#include "lib/file_id.h"
/*
return True if two file_id structures are equal
*/
bool file_id_equal(const struct file_id *id1, const struct file_id *id2)
{
return id1->inode == id2->inode && id1->devid == id2->devid &&
id1->extid == id2->extid;
}
/*
a static-like (on talloc_tos()) string for a file_id structure
*/
const char *file_id_string_tos(const struct file_id *id)
{
return file_id_string(talloc_tos(), id);
}
/*
an allocated string for a file_id structure
*/
const char *file_id_string(TALLOC_CTX *mem_ctx, const struct file_id *id)
{
char *result = talloc_asprintf(mem_ctx, "%llx:%llx:%llx",
(unsigned long long)id->devid,
(unsigned long long)id->inode,
(unsigned long long)id->extid);
SMB_ASSERT(result != NULL);
return result;
}
/*
push a 16 byte version of a file id into a buffer. This ignores the extid
and is needed when dev/inodes are stored in persistent storage (tdbs).
*/
void push_file_id_16(char *buf, const struct file_id *id)
{
SIVAL(buf, 0, id->devid&0xFFFFFFFF);
SIVAL(buf, 4, id->devid>>32);
SIVAL(buf, 8, id->inode&0xFFFFFFFF);
SIVAL(buf, 12, id->inode>>32);
}
/*
push a 24 byte version of a file id into a buffer
*/
void push_file_id_24(char *buf, const struct file_id *id)
{
SIVAL(buf, 0, id->devid&0xFFFFFFFF);
SIVAL(buf, 4, id->devid>>32);
SIVAL(buf, 8, id->inode&0xFFFFFFFF);
SIVAL(buf, 12, id->inode>>32);
SIVAL(buf, 16, id->extid&0xFFFFFFFF);
SIVAL(buf, 20, id->extid>>32);
}
/*
pull a 24 byte version of a file id from a buffer
*/
void pull_file_id_24(const char *buf, struct file_id *id)
{
ZERO_STRUCTP(id);
id->devid = IVAL(buf, 0);
id->devid |= ((uint64_t)IVAL(buf,4))<<32;
id->inode = IVAL(buf, 8);
id->inode |= ((uint64_t)IVAL(buf,12))<<32;
id->extid = IVAL(buf, 16);
id->extid |= ((uint64_t)IVAL(buf,20))<<32;
}
uint64_t make_file_id_from_itime(SMB_STRUCT_STAT *st)
{
struct timespec itime = st->st_ex_itime;
ino_t ino = st->st_ex_ino;
uint64_t file_id_low;
uint64_t file_id;
if (st->st_ex_iflags & ST_EX_IFLAG_CALCULATED_ITIME) {
return ino;
}
round_timespec_to_nttime(&itime);
file_id_low = itime.tv_nsec;
if (file_id_low == 0) {
/*
* This could be by coincidence, but more likely the filesystem
* is only giving us seconds granularity. We need more fine
* grained granularity for the File-ID, so combine with the
* inode number.
*/
file_id_low = ino & ((1 << 30) - 1);
}
/*
* Set the high bit so ideally File-IDs based on inode numbers and
* File-IDs based on Birth Time use disjoint ranges, given inodes never
* have the high bit set.
*/
file_id = ((uint64_t)1) << 63;
file_id |= (uint64_t)itime.tv_sec << 30;
file_id |= file_id_low;
return file_id;
}
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