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paths.c
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paths.c
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/*
Copyright 2012-2021 Jyri J. Virkki <jyri@virkki.com>
This file is part of dupd.
dupd 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.
dupd 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 dupd. If not, see <http://www.gnu.org/licenses/>.
*/
#include <stdio.h>
#include <stdlib.h>
#include <string.h>
#include <strings.h>
#include <unistd.h>
#include "dbops.h"
#include "dirtree.h"
#include "dtrace.h"
#include "hash.h"
#include "main.h"
#include "paths.h"
#include "readlist.h"
#include "sizelist.h"
#include "stats.h"
#include "utils.h"
// Path lists (head + entries) are stored in path blocks which are preallocated
// as needed. This list holds the blocks we've had to allocate.
struct path_block_list {
uint32_t ptr_block_size;
char * ptr;
struct path_block_list * next;
};
static struct path_block_list * first_path_block = NULL;
static struct path_block_list * last_path_block = NULL;
static char * next_entry;
static char * path_block_end;
static long space_used;
static long space_allocated;
void * fiemap = NULL;
/** ***************************************************************************
* Debug function. Dumps the path list for a given size starting from head.
*
*/
// LCOV_EXCL_START
void dump_path_list(const char * line, uint64_t size,
struct path_list_head * head, int dump_all)
{
printf("----- dump path block list for size %ld -----\n", (long)size);
printf("%s\n", line);
printf(" head: %p\n", head);
printf(" last_elem: %p\n", head->last_entry);
printf(" list_size: %d\n", head->list_size);
printf(" wanted_bufsize: %" PRIu32 "\n", head->wanted_bufsize);
printf(" buffer_ready: %d\n", head->buffer_ready);
printf(" state: %s\n", pls_state(head->state));
printf(" hash_passes: %d\n", head->hash_passes);
printf(" have_cached_hashes: %d\n", head->have_cached_hashes);
printf(" sizelist back ptr: %p\n", head->sizelist);
if (head->sizelist != NULL) {
printf(" forward ptr back to me: %p\n", head->sizelist->path_list);
if (head->sizelist->path_list != head) {
printf("error: mismatch!\n");
exit(1);
}
}
struct path_list_entry * entry = pb_get_first_entry(head);
printf(" first_elem: %p\n", entry);
uint32_t counted = 1;
uint32_t valid = 0;
char buffer[DUPD_PATH_MAX];
char * filename;
while (entry != NULL) {
if (counted < 2 || log_level >= L_TRACE || dump_all) {
printf(" --entry %d\n", counted);
printf(" file state: %s\n", file_state(entry->state));
printf(" filename_size: %d\n", entry->filename_size);
printf(" dir: %p\n", entry->dir);
printf(" fd: %d\n", entry->fd);
printf(" next: %p\n", entry->next);
printf(" buffer: %p\n", entry->buffer);
printf(" bufsize: %" PRIu32 "\n", entry->bufsize);
printf(" data_in_buffer: %" PRIu32 "\n", entry->data_in_buffer);
printf(" file_pos: %" PRIu64 "\n", entry->file_pos);
printf(" next_read_byte: %" PRIu64 "\n", entry->next_read_byte);
printf(" next_buffer_pos: %" PRIu32 "\n", entry->next_buffer_pos);
printf(" next_read_block: %d\n", entry->next_read_block);
printf(" blocks: %p\n", entry->blocks);
printf(" hash_ctx: %p\n", entry->hash_ctx);
dump_block_list(" ", entry->blocks);
filename = pb_get_filename(entry);
bzero(buffer, DUPD_PATH_MAX);
memcpy(buffer, filename, entry->filename_size);
buffer[entry->filename_size] = 0;
printf(" filename (direct read): [%s]\n", buffer);
bzero(buffer, DUPD_PATH_MAX);
build_path(entry, buffer);
printf(" built path: [%s]\n", buffer);
if (entry->state != FS_UNIQUE &&
entry->state != FS_IGNORE &&
entry->state != FS_IGNORE_HL) {
valid++;
}
}
counted++;
entry = entry->next;
}
counted--;
printf("counted entries: %d\n", counted);
printf("valid entries: %d\n", valid);
if (valid != head->list_size) {
printf("list_len (%d)!=valid entries (%d)\n", head->list_size, valid);
exit(1);
}
printf("-----\n\n\n");
}
// LCOV_EXCL_STOP
/** ***************************************************************************
* Allocate a path block.
*
*/
static struct path_block_list * alloc_path_block(uint32_t bsize)
{
struct path_block_list * next;
next = (struct path_block_list *)malloc(sizeof(struct path_block_list));
next->next = NULL;
next->ptr_block_size = bsize;
next->ptr = (char *)malloc(bsize);
if (next->ptr == NULL) { // LCOV_EXCL_START
printf("Unable to allocate new path block!\n");
exit(1);
} // LCOV_EXCL_STOP
LOG(L_RESOURCES, "Allocated %d bytes for the next path block.\n", bsize);
inc_stats_pblocks(bsize);
return next;
}
/** ***************************************************************************
* Add another path block.
*
*/
static void add_path_block()
{
uint32_t bsize = last_path_block->ptr_block_size * 2;
if (x_small_buffers) { bsize = DUPD_PATH_MAX; }
struct path_block_list * next = alloc_path_block(bsize);
next_entry = next->ptr;
path_block_end = next->ptr + bsize;
last_path_block->next = next;
last_path_block = next;
space_allocated += bsize;
}
/** ***************************************************************************
* Check if current path block can accomodate 'needed' bytes. If not, add
* another path block.
*
*/
inline static void check_space(int needed)
{
if (path_block_end - next_entry - 2 <= needed) {
add_path_block();
}
}
/** ***************************************************************************
* Clear remaining entry in a path list by marking it FS_UNIQUE.
*
*/
static int clear_remaining_entry(struct path_list_head * head)
{
char file[DUPD_PATH_MAX];
head->state = PLS_DONE;
head->list_size = 0;
d_mutex_lock(&stats_lock, "mark invalid stats");
stats_sets_dup_not[ROUND1]++;
d_mutex_unlock(&stats_lock);
LOG(L_TRACE, "Reduced list size to %d, state now DONE\n", head->list_size);
struct path_list_entry * e = pb_get_first_entry(head);
int good = 0;
while (e != NULL) {
switch (e->state) {
case FS_NEED_DATA:
case FS_BUFFER_READY:
case FS_CACHE_DONE:
good++;
build_path(e, file);
dtrace_set_state(file, head->sizelist->size, e->state, FS_UNIQUE);
e->state = FS_UNIQUE;
free_path_entry(file, head->sizelist->size, e);
break;
case FS_UNIQUE:
case FS_IGNORE:
case FS_IGNORE_HL:
break;
default:
// LCOV_EXCL_START
printf("error: invalid state %s seen in clear_remaining_entry\n",
file_state(e->state));
dump_path_list("bad state", head->sizelist->size, head, 1);
exit(1);
} // LCOV_EXCL_STOP
e = e->next;
}
return good;
}
/** ***************************************************************************
* Shared internal implementation used by mark_path_entry_ignore() and
* mark_path_entry_ignore_hl().
*
*/
static int mark_path_entry_ignore_int(struct path_list_head * head,
struct path_list_entry * entry,
int ignore_state)
{
char file[DUPD_PATH_MAX];
build_path(entry, file);
dtrace_set_state(file, head->sizelist->size, entry->state, ignore_state);
entry->state = ignore_state;
head->list_size--;
free_path_entry(file, head->sizelist->size, entry);
LOG(L_TRACE, "ignore: reduced list size to %d\n", head->list_size);
// If list is down to one entry, it's also unique and no more work remains
if (head->list_size == 1) {
int found = clear_remaining_entry(head);
if (found != 1) {
printf("error: clear_remaining_entry in mark_path_entry_ignore expected "
" one remaining entry but saw %d\n", found);
dump_path_list("", head->sizelist->size, head, 1);
exit(1);
}
}
// After shrinking list_size, we might now have all remaining entries ready
if (head->list_size > 1 && head->list_size == head->buffer_ready) {
head->state = PLS_ALL_BUFFERS_READY;
LOG(L_TRACE, "After shrinking list_size to %d, state now %s\n",
head->list_size, pls_state(head->state));
}
if (debug_size == head->sizelist->size) {
dump_path_list("OUT mark_path_entry_ignore", head->sizelist->size, head,1);
}
if (head->list_size == UINT16_MAX) {
printf("error: mark_path_entry_ignore_int list_size=-1\n");
dump_path_list("", head->sizelist->size, head, 1);
exit(1);
}
return head->list_size;
}
/** ***************************************************************************
* Public function, see paths.h
*
*/
void init_path_block()
{
uint32_t bsize = K64;
if (x_small_buffers) { bsize = DUPD_PATH_MAX; }
first_path_block = alloc_path_block(bsize);
next_entry = first_path_block->ptr;
path_block_end = first_path_block->ptr + bsize;
last_path_block = first_path_block;
space_used = 0;
space_allocated = bsize;
if (using_fiemap) {
fiemap = fiemap_alloc();
}
}
/** ***************************************************************************
* Public function, see paths.h
*
*/
void free_path_block()
{
struct path_block_list * b;
struct path_block_list * p;
p = first_path_block;
while (p != NULL) {
free(p->ptr);
dec_stats_pblocks(p->ptr_block_size);
b = p;
p = b->next;
free(b);
}
first_path_block = NULL;
last_path_block = NULL;
if (fiemap != NULL) {
free(fiemap);
}
}
/** ***************************************************************************
* Public function, see paths.h
*
*/
void free_path_entry(char * path, uint64_t size,
struct path_list_entry * entry)
{
if (entry->buffer != NULL) {
free(entry->buffer);
entry->buffer = NULL;
dec_stats_read_buffers_allocated(path, size, entry->bufsize);
entry->bufsize = 0;
entry->data_in_buffer = 0;
}
if (entry->hash_ctx != NULL) {
hash_fn_buf_free(entry->hash_ctx);
entry->hash_ctx = NULL;
}
if (entry->blocks != NULL) {
free(entry->blocks);
entry->blocks = NULL;
}
if (entry->fd != 0) {
close(entry->fd);
entry->fd = 0;
update_open_files(-1);
}
}
/** ***************************************************************************
* Public function, see paths.h
*
*/
struct path_list_head * insert_first_path(char * filename,
struct direntry * dir_entry,
uint64_t size)
{
int filename_len = strlen(filename);
int space_needed = filename_len +
sizeof(struct path_list_head) + sizeof(struct path_list_entry);
check_space(space_needed);
space_used += space_needed;
// The new list head will live at the top of the available space (next_entry)
struct path_list_head * head = (struct path_list_head *)next_entry;
// The first entry will live immediately after the head
struct path_list_entry * first_entry =
(struct path_list_entry *)((char *)head + sizeof(struct path_list_head));
// And the filename of first entry lives immediately after its entry
char * filebuf = pb_get_filename(first_entry);
// Move the free space pointer forward for the amount of space we took above
next_entry += space_needed;
// The associated sizelist does not exist yet
head->sizelist = NULL;
// Last entry is the first entry since there's only one now
head->last_entry = first_entry;
// Initialize list size to 1
head->list_size = 1;
// Haven't read anything yet
head->buffer_ready = 0;
head->hash_passes = 0;
head->have_cached_hashes = 1;
head->wanted_bufsize = 0;
// New path list
head->state = PLS_NEED_DATA;
// Initialize the first entry
s_files_processed++;
first_entry->filename_size = (uint8_t)filename_len;
first_entry->fd = 0;
first_entry->dir = dir_entry;
first_entry->blocks = NULL;
first_entry->hash_ctx = NULL;
first_entry->file_pos = 0;
first_entry->next_read_byte = 0;
first_entry->next_buffer_pos = 0;
first_entry->next_read_block = 0;
first_entry->next = NULL;
first_entry->buffer = NULL;
first_entry->bufsize = 0;
first_entry->data_in_buffer = 0;
memcpy(filebuf, filename, filename_len);
dtrace_set_state(filename, size, 0, FS_NEED_DATA);
first_entry->state = FS_NEED_DATA;
LOG_EVEN_MORE_TRACE {
dump_path_list("AFTER insert_first_path", size, head, 0);
}
if (debug_size == size) {
dump_path_list("AFTER insert_first_path", size, head, 1);
}
stats_path_list_entries++;
return head;
}
/** ***************************************************************************
* Public function, see paths.h
*
*/
void insert_end_path(char * filename, struct direntry * dir_entry,
ino_t inode, uint64_t size, struct path_list_head * head)
{
char pathbuf[DUPD_PATH_MAX];
struct block_list * block_list = NULL;
int filename_len = strlen(filename);
int space_needed = sizeof(struct path_list_entry) + filename_len;
check_space(space_needed);
space_used += space_needed;
// The entry will live at the top of the available space (next_entry)
struct path_list_entry * entry = (struct path_list_entry *)next_entry;
// And the filename of first entry lives immediately after its entry
char * filebuf = pb_get_filename(entry);
// Move the free space pointer forward for the amount of space we took above
next_entry += space_needed;
// Last entry in this list is now this one and the list grew by one
struct path_list_entry * prior = head->last_entry;
head->last_entry = entry;
prior->next = entry;
head->list_size++;
// Initialize this new entry
s_files_processed++;
entry->filename_size = (uint8_t)filename_len;
entry->fd = 0;
entry->dir = dir_entry;
entry->next = NULL;
entry->buffer = NULL;
entry->hash_ctx = NULL;
entry->bufsize = 0;
entry->data_in_buffer = 0;
entry->blocks = NULL;
entry->file_pos = 0;
entry->next_read_byte = 0;
entry->next_buffer_pos = 0;
entry->next_read_block = 0;
memcpy(filebuf, filename, filename_len);
dtrace_set_state(filename, size, 0, FS_NEED_DATA);
entry->state = FS_NEED_DATA;
// If there are now two entries in this path list, it means we have
// just identified a size which is a candidate for duplicate
// processing later, so add it to the size list now.
if (head->list_size == 2) {
struct size_list * new_szl = add_to_size_list(size, head);
head->sizelist = new_szl;
if (size <= round1_max_bytes) {
head->wanted_bufsize = size;
} else {
head->wanted_bufsize = hash_one_block_size;
}
STRUCT_STAT info;
// Add the first entry to the read list. It wasn't added earlier
// because we didn't know it needed to be there but now we do.
// We'll need to re-stat() it to get info. This should be fast
// because it should be in the cache already. (Alternatively,
// could keep this info in the path list head.)
build_path(prior, pathbuf);
if (get_file_info(pathbuf, &info)) { // LCOV_EXCL_START
printf("error: unable to stat %s\n", pathbuf);
exit(1);
} // LCOV_EXCL_STOP
block_list = get_block_info_from_path(pathbuf, info.st_ino, size,fiemap);
prior->blocks = block_list;
add_to_read_list(head, prior, info.st_ino);
if (use_hash_cache && size > cache_min_size) {
if (cache_db_check_entry(pathbuf) != CACHE_HASH_FOUND) {
head->have_cached_hashes = 0;
}
} else {
head->have_cached_hashes = 0;
}
}
build_path_from_string(filename, dir_entry, pathbuf);
block_list = get_block_info_from_path(pathbuf, inode, size, fiemap);
entry->blocks = block_list;
add_to_read_list(head, entry, inode);
if (use_hash_cache && size > cache_min_size) {
if (cache_db_check_entry(pathbuf) != CACHE_HASH_FOUND) {
head->have_cached_hashes = 0;
}
}
LOG_EVEN_MORE_TRACE {
dump_path_list("AFTER insert_end_path", size, head, 0);
}
if (debug_size == size) {
dump_path_list("AFTER insert_end_path", size, head, 1);
}
if (head->list_size > stats_max_pathlist) {
stats_max_pathlist = head->list_size;
stats_max_pathlist_size = size;
}
stats_path_list_entries++;
}
/** ***************************************************************************
* Public function, see paths.h
*
*/
void report_path_block_usage()
{
int pct = (int)((100 * space_used) / space_allocated);
printf("Total path block size: %ld\n", space_allocated);
printf("Bytes used in this run: %ld (%d%%)\n", space_used, pct);
printf("Total files in path list: %" PRIu32 "\n", stats_path_list_entries);
}
/** ***************************************************************************
* Public function, see paths.h
*
*/
const char * pls_state(int state)
{
switch(state) {
case PLS_NEED_DATA: return "PLS_NEED_DATA";
case PLS_ALL_BUFFERS_READY: return "PLS_ALL_BUFFERS_READY";
case PLS_DONE: return "PLS_DONE";
default:
printf("\nerror: unknown pls_state %d\n", state);
exit(1);
}
}
/** ***************************************************************************
* Public function, see paths.h
*
*/
const char * file_state(int state)
{
switch(state) {
case FS_NEED_DATA: return "FS_NEED_DATA";
case FS_BUFFER_READY: return "FS_BUFFER_READY";
case FS_DONE: return "FS_DONE";
case FS_CACHE_DONE: return "FS_CACHE_DONE";
case FS_UNIQUE: return "FS_UNIQUE";
case FS_IGNORE: return "FS_IGNORE";
case FS_IGNORE_HL: return "FS_IGNORE_HL";
default:
printf("\nerror: unknown file_state %d\n", state);
exit(1);
}
}
/** ***************************************************************************
* Public function, see paths.h
*
*/
void mark_path_entry_unique(struct path_list_head * head,
struct path_list_entry * entry)
{
char file[DUPD_PATH_MAX];
if (debug_size == head->sizelist->size) {
dump_path_list("IN mark_path_entry_unique", head->sizelist->size, head, 1);
}
if (entry->state == FS_UNIQUE) {
LOG(L_TRACE, "mark_path_entry_unique: entry is already FS_UNIQUE, skip\n");
return;
}
// XXX check different preconditions for each acceptable input state?
// States which can transition to FS_UNIQUE
if (entry->state != FS_NEED_DATA && entry->state != FS_CACHE_DONE) {
// LCOV_EXCL_START
printf("error: set entry state FS_UNIQUE but current state is %s\n",
file_state(entry->state));
dump_path_list("bad state", head->sizelist->size, head, 1);
exit(1);
} // LCOV_EXCL_STOP
if (head->list_size == 0) {
// LCOV_EXCL_START
printf("error: set entry state FS_UNIQUE but list size is zero!!\n");
dump_path_list("bad state", head->sizelist->size, head, 1);
exit(1);
} // LCOV_EXCL_STOP
build_path(entry, file);
dtrace_set_state(file, head->sizelist->size, entry->state, FS_UNIQUE);
entry->state = FS_UNIQUE;
head->list_size--;
free_path_entry(file, head->sizelist->size, entry);
LOG(L_TRACE, "unique: reduced list size to %d\n", head->list_size);
// After shrinking list_size, we might now have all remaining entries ready
if (head->list_size == head->buffer_ready) {
head->state = PLS_ALL_BUFFERS_READY;
LOG(L_TRACE, "unique: After shrinking list_size to %d, state now %s\n",
head->list_size, pls_state(head->state));
}
if (head->list_size == 1) {
int found = clear_remaining_entry(head);
if (found != 1) {
printf("error: clear_remaining_entry in mark_path_entry_unique expected "
" one remaining entry but saw %d\n", found);
dump_path_list("", head->sizelist->size, head, 1);
}
}
if (debug_size == head->sizelist->size) {
dump_path_list("OUT mark_path_entry_unique", head->sizelist->size, head,1);
}
}
/** ***************************************************************************
* Public function, see paths.h
*
*/
int mark_path_entry_ignore(struct path_list_head * head,
struct path_list_entry * entry)
{
if (debug_size == head->sizelist->size) {
dump_path_list("IN mark_path_entry_ignore", head->sizelist->size, head, 1);
}
if (entry->state != FS_NEED_DATA) {
// LCOV_EXCL_START
printf("error: set entry state FS_IGNORE but current state is %s\n",
file_state(entry->state));
dump_path_list("bad state", head->sizelist->size, head, 1);
exit(1);
} // LCOV_EXCL_STOP
if (head->list_size == 0) {
// LCOV_EXCL_START
printf("error: set entry state FS_IGNORE but list size is zero!!\n");
dump_path_list("bad state", head->sizelist->size, head, 1);
exit(1);
} // LCOV_EXCL_STOP
return mark_path_entry_ignore_int(head, entry, FS_IGNORE);
}
/** ***************************************************************************
* Public function, see paths.h
*
*/
int mark_path_entry_ignore_hardlink(struct path_list_head * head,
struct path_list_entry * entry)
{
if (debug_size == head->sizelist->size) {
dump_path_list("IN mark_path_entry_ignore", head->sizelist->size, head, 1);
}
// For FS_IGNORE_HL it is possible that this list is already empty when
// hardlinks are dropped in sort_read_list(). In those cases, we're done.
if (head->list_size == 0) {
return 0;
}
if (entry->state != FS_NEED_DATA && entry->state != FS_UNIQUE) {
// LCOV_EXCL_START
printf("error: set entry state FS_IGNORE_HL but current state is %s\n",
file_state(entry->state));
dump_path_list("bad state", head->sizelist->size, head, 1);
exit(1);
} // LCOV_EXCL_STOP
return mark_path_entry_ignore_int(head, entry, FS_IGNORE_HL);
}
/** ***************************************************************************
* Public function, see paths.h
*
*/
void mark_path_entry_ready(struct path_list_head * head,
struct path_list_entry * entry)
{
char file[DUPD_PATH_MAX];
if (head->state != PLS_NEED_DATA) {
printf("error: mark_path_entry_ready: head->state != PLS_NEED_DATA\n");
dump_path_list("", head->sizelist->size, head, 1);
exit(1);
}
if (entry->state != FS_NEED_DATA) {
printf("error: mark_path_entry_ready: entry->state != FS_NEED_DATA\n");
dump_path_list("", head->sizelist->size, head, 1);
exit(1);
}
build_path(entry, file);
dtrace_set_state(file, head->sizelist->size, entry->state, FS_BUFFER_READY);
entry->state = FS_BUFFER_READY;
head->buffer_ready++;
if (head->buffer_ready == head->list_size) {
head->state = PLS_ALL_BUFFERS_READY;
LOG_INFO {
struct path_list_entry * pe = pb_get_first_entry(head);
uint32_t ready = 0;
while (pe != NULL) {
if (pe->state == FS_BUFFER_READY) { ready++; }
pe = pe->next;
}
if (ready != head->list_size) {
printf("error: ready=%d but list_size=%d\n", ready, head->list_size);
dump_path_list("mark_path_entry_ready", head->sizelist->size, head, 1);
exit(1);
}
}
}
}