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feat(tools/mkfs): write root directory

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d0p1 🏳️‍⚧️ 2024-06-15 11:57:02 +02:00
parent ac9c46bf24
commit 4c730f50f8
5 changed files with 159 additions and 44 deletions
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69
lib/block.c
View file

@ -1,26 +1,85 @@
#include "stpdfs.h"
#include <stdio.h>
#include <stdint.h>
#include <string.h>
#include <unistd.h>
#include <time.h>
size_t
stpdfs_write(int fd, uint32_t blocknum, void *data, size_t size)
{
return (0);
uint8_t buffer[STPDFS_BLOCK_SIZE];
if (size > STPDFS_BLOCK_SIZE) return (-1);
lseek(fd, blocknum * STPDFS_BLOCK_SIZE, SEEK_SET);
if (size > 0)
{
memcpy(buffer, data, size);
return (write(fd, buffer, STPDFS_BLOCK_SIZE));
}
return (write(fd, data, size));
}
size_t
stpdfs_read(int fd, uint32_t blocknum, void *data, size_t size)
{
return (0);
lseek(fd, blocknum * STPDFS_BLOCK_SIZE, SEEK_SET);
return (read(fd, data, size));
}
uint32_t
stpdfs_alloc_block(int fd)
stpdfs_alloc_block(int fd, struct stpdfs_sb *sb)
{
return (0);
uint32_t blocknum;
struct stpdfs_free freelist;
sb->state = STPDFS_DIRTY; /* mark state dirty */
redo:
sb->nfree--;
blocknum = sb->free[sb->nfree];
if (sb->nfree == 0 && blocknum != 0)
{
stpdfs_read(fd, blocknum, &freelist, sizeof(struct stpdfs_free));
memcpy(sb->free, &freelist, sizeof(uint32_t) * 100);
sb->nfree = freelist.nfree;
goto redo;
}
sb->time = time(NULL);
return (blocknum);
}
int
stpdfs_free_block(int fd)
stpdfs_free_block(int fd, struct stpdfs_sb *sb, uint32_t blocknum)
{
struct stpdfs_free copy;
if (blocknum == 0 || blocknum >= sb->fsize)
{
return (-1);
}
sb->state = STPDFS_DIRTY; /* mark state dirty */
if (sb->nfree == 100)
{
memcpy(&copy, sb->free, sizeof(uint32_t) * 100);
copy.nfree = sb->nfree;
stpdfs_write(fd, blocknum, &copy, sizeof(struct stpdfs_free));
sb->nfree = 1;
sb->free[0] = blocknum;
}
else
{
sb->free[sb->nfree++] = blocknum;
}
sb->time = time(NULL);
return (0);
}

67
lib/inode.c
View file

@ -1,10 +1,71 @@
#include "stpdfs.h"
#include <string.h>
#include <stdint.h>
uint32_t
alloc_inode(int fd)
stpdfs_locate_inode(uint32_t inode)
{
uint32_t start = 1;
uint32_t block;
return (2 + inode / STPDFS_INODES_PER_BLOCK);
}
int
stpdfs_read_inode()
{
return (0);
}
int
stpdfs_write_inode()
{
return (0);
}
uint32_t
stpdfd_alloc_inode(int fd, struct stpdfs_sb *sb)
{
uint32_t start = 2;
uint32_t blocknum;
struct stpdfs_inode inodes[STPDFS_INODES_PER_BLOCK];
int idx;
blocknum = 2;
for (blocknum = 2; (blocknum - 2) < sb->isize; blocknum++)
{
stpdfs_read(fd, blocknum, inodes, sizeof(struct stpdfs_inode) * STPDFS_INODES_PER_BLOCK);
for (idx = (start % STPDFS_INODES_PER_BLOCK); idx < STPDFS_INODES_PER_BLOCK; idx++)
{
if (!(inodes[start].flags & STPDFS_INO_FLAG_ALOC))
{
inodes[start].flags |= STPDFS_INO_FLAG_ALOC;
return (start);
}
start++;
}
}
return (0);
}
int
stpdfs_free_inode(int fd, struct stpdfs_sb *sb, uint32_t ino)
{
uint32_t blocknum;
struct stpdfs_inode inodes[STPDFS_INODES_PER_BLOCK];
blocknum = 2 + ino / STPDFS_INODES_PER_BLOCK;
if (blocknum >= sb->fsize || (blocknum - 2) >= sb->isize)
{
return (-1);
}
sb->state = STPDFS_DIRTY;
stpdfs_read(fd, blocknum, inodes, sizeof(struct stpdfs_inode) * STPDFS_INODES_PER_BLOCK);
memset(&inodes[ino % STPDFS_INODES_PER_BLOCK], 0, sizeof(struct stpdfs_inode));
stpdfs_write(fd, blocknum, inodes, sizeof(struct stpdfs_inode) * STPDFS_INODES_PER_BLOCK);
return (0);
}

10
lib/stpdfs.h
View file

@ -8,6 +8,8 @@
# define STPDFS_SB_REV STPDFS_SB_REV_1
# define STPDFS_SB_REV_1 1
# define STPDFS_INO_ROOTDIR 1
# define STPDFS_BLOCK_SIZE_BITS 9
# define STPDFS_BLOCK_SIZE (1 << STPDFS_BLOCK_SIZE_BITS)
@ -35,7 +37,8 @@ struct stpdfs_free {
enum stpdfs_state {
STPDFS_CLEANLY_UNMOUNTED = 0,
STPDFS_ERROR = 1
STPDFS_ERROR = 1,
STPDFS_DIRTY = 1,
};
/**
@ -83,9 +86,14 @@ struct stpdfs_dirent {
size_t stpdfs_write(int fd, uint32_t blocknum, void *data, size_t size);
size_t stpdfs_read(int fd, uint32_t blocknum, void *data, size_t size);
uint32_t stpdfs_alloc_block(int fd, struct stpdfs_sb *sb);
int stpdfs_free_block(int fd, struct stpdfs_sb *sb, uint32_t blocknum);
/* superblock.c */
int stpdfs_superblock_valid(const struct stpdfs_sb *sb);
int stpdfs_read_superblock(int fd, struct stpdfs_sb *sb);
/* inode.c */
uint32_t stpdfd_alloc_inode(int fd, struct stpdfs_sb *sb);
#endif /* !STPDFS_H */

1
tools/Makefile.am
View file

@ -1,4 +1,5 @@
AM_CFLAGS = -I$(top_srcdir)/lib -I$(top_srcdir)
LDADD = ../lib/libstpdfs.a
bin_PROGRAMS = mkfs.stpd

56
tools/mkfs/main.c
View file

@ -74,26 +74,6 @@ write_block(int fd, void *data, size_t size)
return (write(fd, buffer, STPDFS_BLOCK_SIZE) == STPDFS_BLOCK_SIZE);
}
static void
add_free_block(int fd, int num)
{
struct stpdfs_free copy;
if (super.nfree == 100)
{
memcpy(&copy, super.free, sizeof(uint32_t) * 100);
copy.nfree = super.nfree;
lseek(fd, num * STPDFS_BLOCK_SIZE, SEEK_SET);
write_block(fd, &copy, sizeof(struct stpdfs_free));
super.nfree = 1;
super.free[0] = num;
}
else
{
super.free[super.nfree++] = num;
}
}
static int
mkfs()
@ -140,8 +120,6 @@ mkfs()
}
}
write_block(fd, NULL, 0);
super.magic = STPDFS_SB_MAGIC;
super.revision = STPDFS_SB_REV;
super.isize = inodes / STPDFS_INODES_PER_BLOCK;
@ -151,36 +129,44 @@ mkfs()
/* write inodes */
lseek(fd, 2 * STPDFS_BLOCK_SIZE, SEEK_SET);
memset(&inds, 0, sizeof(struct stpdfs_inode) * STPDFS_INODES_PER_BLOCK);
inds[1].modtime = time(NULL);
inds[1].actime = time(NULL);
inds[1].size = sizeof(struct stpdfs_dirent) * 2;
inds[1].flags = STPDFS_INO_FLAG_ALOC;
inds[1].mode = STPDFS_S_IFDIR;
write_block(fd, &inds, sizeof(struct stpdfs_inode) * STPDFS_INODES_PER_BLOCK);
memset(&inds, 0, sizeof(struct stpdfs_inode) * STPDFS_INODES_PER_BLOCK);
for (idx = 1; idx < super.isize; idx++)
for (idx = 0; idx < super.isize; idx++)
{
write_block(fd, &inds, sizeof(struct stpdfs_inode) * STPDFS_INODES_PER_BLOCK);
if (write_block(fd, &inds, sizeof(struct stpdfs_inode) * STPDFS_INODES_PER_BLOCK));
}
/* set free blocks */
freeblock = blocks - (inodes + 2);
for (nextfree = super.isize + 3; nextfree < freeblock; nextfree++)
{
add_free_block(fd, nextfree);
if (stpdfs_free_block(fd, &super, nextfree) != 0)
{
fprintf(stderr, "error: %u\n", nextfree);
}
}
/* create root dir */
stpdfs_read(fd, 2, &inds, sizeof(struct stpdfs_inode) * STPDFS_INODES_PER_BLOCK);
inds[STPDFS_INO_ROOTDIR].modtime = time(NULL);
inds[STPDFS_INO_ROOTDIR].actime = time(NULL);
inds[STPDFS_INO_ROOTDIR].size = sizeof(struct stpdfs_dirent) * 2;
inds[STPDFS_INO_ROOTDIR].flags = STPDFS_INO_FLAG_ALOC;
inds[STPDFS_INO_ROOTDIR].mode = STPDFS_S_IFDIR;
inds[STPDFS_INO_ROOTDIR].zones[0] = stpdfs_alloc_block(fd, &super);
inds[STPDFS_INO_ROOTDIR].size = sizeof(struct stpdfs_dirent) * 2;
stpdfs_read(fd, inds[STPDFS_INO_ROOTDIR].zones[0], rootdirent, sizeof(struct stpdfs_dirent) * 2);
strcpy(rootdirent[0].filename, ".");
rootdirent[1].inode = 1;
strcpy(rootdirent[1].filename, "..");
rootdirent[1].inode = 1;
stpdfs_write(fd, inds[STPDFS_INO_ROOTDIR].zones[0], rootdirent, sizeof(struct stpdfs_dirent) * 2);
stpdfs_write(fd, 2, &inds, sizeof(struct stpdfs_inode) * STPDFS_INODES_PER_BLOCK);
/* write super block */
lseek(fd, 1 * STPDFS_BLOCK_SIZE, SEEK_SET);
super.time = time(NULL);
super.state = STPDFS_CLEANLY_UNMOUNTED;
write_block(fd, &super, sizeof(struct stpdfs_sb));
stpdfs_write(fd, 1, &super, sizeof(struct stpdfs_sb));
/* we finished \o/ */
printf("StupidFS: %u blocks (%u Inodes)\n", super.fsize, super.isize);
close(fd);