mirror of
https://github.com/samba-team/samba.git
synced 2024-12-22 13:34:15 +03:00
05f7558b4c
SMB_STRUCT_STAT is defined in includes.h. This way including file_id.h is possible without including includes.h Signed-off-by: Volker Lendecke <vl@samba.org> Reviewed-by: Jeremy Allison <jra@samba.org>
119 lines
3.1 KiB
C
119 lines
3.1 KiB
C
/*
|
|
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;
|
|
}
|
|
|
|
char *file_id_str_buf(struct file_id fid, struct file_id_buf *dst)
|
|
{
|
|
snprintf(dst->buf,
|
|
sizeof(dst->buf),
|
|
"%"PRIu64":%"PRIu64":%"PRIu64,
|
|
fid.devid,
|
|
fid.inode,
|
|
fid.extid);
|
|
return dst->buf;
|
|
}
|
|
|
|
/*
|
|
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(const struct stat_ex *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;
|
|
}
|