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ext2: fix block group calculation for inodes

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This commit is contained in:
K. Lange 2021-11-18 17:07:08 +09:00
parent d2fe9c19d7
commit 01765b3e5e
1 changed files with 44 additions and 8 deletions
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46
modules/ext2.c
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@ -479,6 +479,12 @@ static unsigned int get_block_number(ext2_fs_t * this, ext2_inodetable_t * inode
}
static int write_inode(ext2_fs_t * this, ext2_inodetable_t *inode, size_t index) {
if (!index) {
dprintf("ext2: Attempt to write inode 0\n");
return E_BADBLOCK;
}
index--;
size_t group = index / this->inodes_per_group;
if (group > BGDS) {
return E_BADBLOCK;
@ -486,8 +492,8 @@ static int write_inode(ext2_fs_t * this, ext2_inodetable_t *inode, size_t index)
size_t inode_table_block = BGD[group].inode_table;
index -= group * this->inodes_per_group;
size_t block_offset = ((index - 1) * this->inode_size) / this->block_size;
size_t offset_in_block = (index - 1) - block_offset * (this->block_size / this->inode_size);
size_t block_offset = (index * this->inode_size) / this->block_size;
size_t offset_in_block = index - block_offset * (this->block_size / this->inode_size);
ext2_inodetable_t *inodet = malloc(this->block_size);
/* Read the current table block */
@ -766,17 +772,38 @@ static unsigned int allocate_inode(ext2_fs_t * this) {
if (BGD[i].free_inodes_count > 0) {
debug_print(NOTICE, "Group %d has %d free inodes.", i, BGD[i].free_inodes_count);
read_block(this, BGD[i].inode_bitmap, (uint8_t *)bg_buffer);
/* Sorry for the weird loops */
while (1) {
while (BLOCKBIT(node_offset)) {
node_offset++;
if (node_offset == this->inodes_per_group) {
goto _next_block;
}
}
node_no = node_offset + i * this->inodes_per_group + 1;
/* Is this a reserved inode? */
if (node_no <= 10) {
node_offset++;
if (node_offset == this->inodes_per_group) {
goto _next_block;
}
continue;
}
break;
}
if (node_offset == this->inodes_per_group) {
_next_block:
node_offset = 0;
continue;
}
group = i;
break;
}
}
if (!node_no) {
mutex_release(this->mutex);
debug_print(ERROR, "Ran out of inodes!");
dprintf("ext2: Out of inodes? node_no = 0\n");
return 0;
}
@ -1142,14 +1169,20 @@ static int unlink_ext2(fs_node_t * node, char * name) {
static void refresh_inode(ext2_fs_t * this, ext2_inodetable_t * inodet, size_t inode) {
if (!inode) {
dprintf("ext2: Attempt to read inode 0\n");
return;
}
inode--;
uint32_t group = inode / this->inodes_per_group;
if (group > BGDS) {
return;
}
uint32_t inode_table_block = BGD[group].inode_table;
inode -= group * this->inodes_per_group; // adjust index within group
uint32_t block_offset = ((inode - 1) * this->inode_size) / this->block_size;
uint32_t offset_in_block = (inode - 1) - block_offset * (this->block_size / this->inode_size);
uint32_t block_offset = (inode * this->inode_size) / this->block_size;
uint32_t offset_in_block = inode - block_offset * (this->block_size / this->inode_size);
uint8_t * buf = malloc(this->block_size);
@ -1607,6 +1640,9 @@ static fs_node_t * mount_ext2(fs_node_t * block_device, int flags) {
read_block(this, this->bgd_offset + i, (uint8_t *)((uintptr_t)BGD + this->block_size * i));
}
dprintf("ext2: %u BGDs, %u inodes, %u inodes per group\n",
BGDS, SB->inodes_count, this->inodes_per_group);
#if 1 // DEBUG_BLOCK_DESCRIPTORS
char * bg_buffer = malloc(this->block_size * sizeof(char));
for (uint32_t i = 0; i < BGDS; ++i) {