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[wip] fixing fs_write

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ІО-23 Шмуляр Олег 2025-04-30 22:33:23 +03:00
parent 60a2815f3a
commit ba8f8031f0
1 changed files with 28 additions and 12 deletions
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36
src/fs.c
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@ -107,7 +107,7 @@ static void mark_free(unsigned int block_no)
read_block(0, (void *) &fsh);
if (block_no > fsh.block_count) {
pr_err("block %d is out of fimesystem block range (%d)\n", block_no, fsh.block_count);
pr_err("block %d is out of filesystem block range (%d)\n", block_no, fsh.block_count);
return;
}
@ -922,6 +922,7 @@ static int write_fd_block(unsigned int fd, unsigned int block_index, unsigned ch
struct fs_inode_extension ext;
memset(&ext, 0, sizeof(struct fs_inode_extension));
write_block(new_block, (void *) &ext);
f.next_extension = new_block;
write_block(fs_file_descriptions[fd].inode, (void *) &f);
@ -1104,25 +1105,40 @@ int fs_write(void *d)
int block_index = fs_file_descriptions[fd].rw_offset / FS_BLOCK_SIZE;
int block_offset = fs_file_descriptions[fd].rw_offset % FS_BLOCK_SIZE;
unsigned int total_bytes_written = 0;
unsigned char data_buffer[FS_BLOCK_SIZE];
if (block_offset + str_len <= FS_BLOCK_SIZE) {
// first block
read_fd_block(fd, block_index, data_buffer);
memcpy(&(data_buffer[block_offset]), str, str_len);
{
unsigned int copy_amount = ((FS_BLOCK_SIZE - block_offset) <= str_len)
? FS_BLOCK_SIZE - block_offset
: str_len;
memcpy(&(data_buffer[block_offset]), str, copy_amount);
total_bytes_written += copy_amount;
}
write_fd_block(fd, block_index, data_buffer);
} else {
block_index++;
// full middle blocks
for ( ; str_len - total_bytes_written >= FS_BLOCK_SIZE; block_index++) {
write_fd_block(fd, block_index, (unsigned char *) &(str[total_bytes_written]));
total_bytes_written += FS_BLOCK_SIZE;
}
// last partial block
if (str_len - total_bytes_written) {
read_fd_block(fd, block_index, data_buffer);
memcpy(&(data_buffer[block_offset]), str, FS_BLOCK_SIZE - block_offset);
memcpy(data_buffer, &(str[total_bytes_written]), str_len - total_bytes_written);
write_fd_block(fd, block_index, data_buffer);
read_fd_block(fd, block_index+1, data_buffer);
memcpy(data_buffer, &(str[FS_BLOCK_SIZE - block_offset]), str_len - block_offset);
write_fd_block(fd, block_index+1, data_buffer);
total_bytes_written += (str_len - total_bytes_written);
}
pr("Moving fd %d offset: %d -> %d\n",
fd, fs_file_descriptions[fd].rw_offset, fs_file_descriptions[fd].rw_offset + str_len);
fs_file_descriptions[fd].rw_offset += str_len;
fd, fs_file_descriptions[fd].rw_offset, fs_file_descriptions[fd].rw_offset + total_bytes_written);
fs_file_descriptions[fd].rw_offset += total_bytes_written;
struct fs_inode f;
read_block(fs_file_descriptions[fd].inode, (void *) &f);