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https://github.com/samba-team/samba.git
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a5a2ce953b
Signed-off-by: Ralph Boehme <slow@samba.org> Reviewed-by: Jeremy Allison <jra@samba.org>
127 lines
3.4 KiB
C
127 lines
3.4 KiB
C
/*
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Unix SMB/CIFS implementation.
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file_id structure handling
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Copyright (C) Andrew Tridgell 2007
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; either version 3 of the License, or
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(at your option) any later version.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program. If not, see <http://www.gnu.org/licenses/>.
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*/
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#include "includes.h"
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#include "lib/file_id.h"
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/*
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return True if two file_id structures are equal
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*/
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bool file_id_equal(const struct file_id *id1, const struct file_id *id2)
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{
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return id1->inode == id2->inode && id1->devid == id2->devid &&
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id1->extid == id2->extid;
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}
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/*
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a static-like (on talloc_tos()) string for a file_id structure
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*/
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const char *file_id_string_tos(const struct file_id *id)
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{
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return file_id_string(talloc_tos(), id);
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}
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/*
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an allocated string for a file_id structure
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*/
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const char *file_id_string(TALLOC_CTX *mem_ctx, const struct file_id *id)
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{
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char *result = talloc_asprintf(mem_ctx, "%llx:%llx:%llx",
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(unsigned long long)id->devid,
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(unsigned long long)id->inode,
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(unsigned long long)id->extid);
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SMB_ASSERT(result != NULL);
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return result;
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}
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/*
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push a 16 byte version of a file id into a buffer. This ignores the extid
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and is needed when dev/inodes are stored in persistent storage (tdbs).
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*/
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void push_file_id_16(char *buf, const struct file_id *id)
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{
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SIVAL(buf, 0, id->devid&0xFFFFFFFF);
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SIVAL(buf, 4, id->devid>>32);
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SIVAL(buf, 8, id->inode&0xFFFFFFFF);
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SIVAL(buf, 12, id->inode>>32);
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}
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/*
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push a 24 byte version of a file id into a buffer
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*/
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void push_file_id_24(char *buf, const struct file_id *id)
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{
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SIVAL(buf, 0, id->devid&0xFFFFFFFF);
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SIVAL(buf, 4, id->devid>>32);
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SIVAL(buf, 8, id->inode&0xFFFFFFFF);
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SIVAL(buf, 12, id->inode>>32);
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SIVAL(buf, 16, id->extid&0xFFFFFFFF);
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SIVAL(buf, 20, id->extid>>32);
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}
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/*
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pull a 24 byte version of a file id from a buffer
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*/
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void pull_file_id_24(const char *buf, struct file_id *id)
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{
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ZERO_STRUCTP(id);
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id->devid = IVAL(buf, 0);
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id->devid |= ((uint64_t)IVAL(buf,4))<<32;
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id->inode = IVAL(buf, 8);
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id->inode |= ((uint64_t)IVAL(buf,12))<<32;
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id->extid = IVAL(buf, 16);
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id->extid |= ((uint64_t)IVAL(buf,20))<<32;
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}
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uint64_t make_file_id_from_itime(SMB_STRUCT_STAT *st)
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{
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struct timespec itime = st->st_ex_itime;
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ino_t ino = st->st_ex_ino;
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uint64_t file_id_low;
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uint64_t file_id;
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if (st->st_ex_iflags & ST_EX_IFLAG_CALCULATED_ITIME) {
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return ino;
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}
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file_id_low = itime.tv_nsec;
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if (file_id_low == 0) {
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/*
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* This could be by coincidence, but more likely the filesystem
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* is only giving us seconds granularity. We need more fine
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* grained granularity for the File-ID, so combine with the
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* inode number.
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*/
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file_id_low = ino & ((1 << 30) - 1);
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}
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/*
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* Set the high bit so ideally File-IDs based on inode numbers and
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* File-IDs based on Birth Time use disjoint ranges, given inodes never
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* have the high bit set.
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*/
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file_id = ((uint64_t)1) << 63;
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file_id |= (uint64_t)itime.tv_sec << 30;
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file_id |= file_id_low;
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return file_id;
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}
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