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/* SPDX-License-Identifier: GPL-3.0-or-later */
#include "fstree.h"
#include <stdlib.h>
#include <string.h>
#include <stdio.h>
static void remove_from_list(fstree_t *fs, tree_xattr_t *xattr)
{
tree_xattr_t *prev = NULL, *it = fs->xattr;
while (it != xattr) {
prev = it;
it = it->next;
}
if (prev == NULL) {
fs->xattr = xattr->next;
} else {
prev->next = xattr->next;
}
}
static tree_xattr_t *grow_xattr_block(tree_xattr_t *xattr)
{
size_t new_size, old_size = 0, new_count = 4;
void *new;
if (xattr != NULL) {
new_count = xattr->max_attr * 2;
old_size = sizeof(*xattr) + sizeof(uint64_t) * xattr->max_attr;
}
new_size = sizeof(*xattr) + sizeof(uint64_t) * new_count;
new = realloc(xattr, new_size);
if (new == NULL) {
perror("adding extended attributes");
free(xattr);
return NULL;
}
memset((char *)new + old_size, 0, new_size - old_size);
xattr = new;
xattr->max_attr = new_count;
return xattr;
}
int fstree_add_xattr(fstree_t *fs, tree_node_t *node,
const char *key, const char *value)
{
size_t key_idx, value_idx;
tree_xattr_t *xattr;
if (str_table_get_index(&fs->xattr_keys, key, &key_idx))
return -1;
if (str_table_get_index(&fs->xattr_values, value, &value_idx))
return -1;
if (sizeof(size_t) > sizeof(uint32_t)) {
if (key_idx > 0xFFFFFFFFUL) {
fputs("Too many unique xattr keys\n", stderr);
return -1;
}
if (value_idx > 0xFFFFFFFFUL) {
fputs("Too many unique xattr values\n", stderr);
return -1;
}
}
xattr = node->xattr;
if (xattr == NULL || xattr->max_attr == xattr->num_attr) {
if (xattr != NULL)
remove_from_list(fs, xattr);
xattr = grow_xattr_block(xattr);
if (xattr == NULL)
return -1;
node->xattr = xattr;
xattr->owner = node;
xattr->next = fs->xattr;
fs->xattr = xattr;
}
xattr->ref[xattr->num_attr] = (uint64_t)key_idx << 32;
xattr->ref[xattr->num_attr] |= (uint64_t)value_idx;
xattr->num_attr += 1;
return 0;
}
static int cmp_u64(const void *lhs, const void *rhs)
{
uint64_t l = *((uint64_t *)lhs), r = *((uint64_t *)rhs);
return l < r ? -1 : (l > r ? 1 : 0);
}
void fstree_xattr_reindex(fstree_t *fs)
{
uint32_t key_idx, value_idx;
size_t i, index = 0;
tree_xattr_t *it;
str_table_reset_ref_count(&fs->xattr_keys);
str_table_reset_ref_count(&fs->xattr_values);
for (it = fs->xattr; it != NULL; it = it->next) {
it->index = index++;
for (i = 0; i < it->num_attr; ++i) {
key_idx = (it->ref[i] >> 32) & 0x00000000FFFFFFFF;
value_idx = it->ref[i] & 0x00000000FFFFFFFF;
str_table_add_ref(&fs->xattr_keys, key_idx);
str_table_add_ref(&fs->xattr_values, value_idx);
}
}
}
void fstree_xattr_deduplicate(fstree_t *fs)
{
tree_xattr_t *it, *it1, *prev;
int diff;
for (it = fs->xattr; it != NULL; it = it->next)
qsort(it->ref, it->num_attr, sizeof(it->ref[0]), cmp_u64);
prev = NULL;
it = fs->xattr;
while (it != NULL) {
for (it1 = fs->xattr; it1 != it; it1 = it1->next) {
if (it1->num_attr != it->num_attr)
continue;
diff = memcmp(it1->ref, it->ref,
it->num_attr * sizeof(it->ref[0]));
if (diff == 0)
break;
}
if (it1 != it) {
prev->next = it->next;
it->owner->xattr = it1;
free(it);
it = prev->next;
} else {
prev = it;
it = it->next;
}
}
fstree_xattr_reindex(fs);
}
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