d0p1/StupidFS
d0p1/StupidFS
1
0
Fork 0
Code Issues Pull requests Packages Projects Releases Wiki Activity

refactor: remove lib/

Browse source
This commit is contained in:
d0p1 🏳️‍⚧️ 2024-07-27 10:57:23 +00:00
parent 45dfffc55a
commit c5f4b5878b
16 changed files with 502 additions and 479 deletions
Show stats Download patch file Download diff file Expand all files Collapse all files

2
Makefile.am
View file

@ -1,4 +1,4 @@
SUBDIRS = lib libcrypto liblzp tools
SUBDIRS = libstpdfs libcrypto liblzp tools
if BUILD_FUSE
SUBDIRS += fuse

136
docs/book/main.tex
View file

@ -164,6 +164,142 @@ struct inode {
\end{tabular}
\end{center}
\section{Dirent}
\begin{lstlisting}[language=C]
struct stpdfs_dirent {
ino_t inode;
char filename[STPDFS_NAME_MAX];
};
\end{lstlisting}
\appendix
\chapter{LZP implementation}
\section{Compression}
\begin{lstlisting}[language=C]
#include <stdint.h>
#include <string.h>
#define LZP_HASH_ORDER 16
#define LZP_HASH_SIZE (1 << LZP_HASH_ORDER)
#define HASH(h, x) ((h << 4) ^ x)
void
lzp_compress(uint8_t *out, size_t *outsz, const uint8_t *in, size_t insz)
{
uint8_t c;
uint16_t hash;
uint32_t mask;
uint8_t table[LZP_HASH_SIZE] = { 0 };
size_t i, j;
size_t inpos;
size_t outpos;
uint8_t buff[9];
inpos = 0;
outpos = 0;
hash = 0;
while (inpos < insz)
{
j = 1;
mask = 0;
for (i = 0; i < 8; i++)
{
if (inpos >= insz)
{
break;
}
c = in[inpos++];
if (table[hash] == c)
{
mask |= 1 << i;
}
else
{
table[hash] = c;
buff[j++] = c;
}
hash = HASH(hash, c);
}
if (i > 0)
{
buff[0] = mask;
if (out != NULL)
{
memcpy(out + outpos, buff, j);
}
outpos += j;
}
}
*outsz = outpos;
}
\end{lstlisting}
\section{Decompression}
\begin{lstlisting}[language=C]
void
lzp_decompress(uint8_t *out, size_t *outsz, const uint8_t *in, size_t insz)
{
uint8_t c;
uint16_t hash = 0;
uint32_t mask = 0;
uint8_t table[LZP_HASH_SIZE] = { 0 };
size_t i, j;
size_t inpos;
size_t outpos;
uint8_t buff[9];
inpos = 0;
outpos = 0;
while (inpos < insz)
{
j = 0;
if (inpos >= insz)
{
break;
}
mask = in[inpos++];
for (i = 0; i < 8; i++)
{
if ((mask & (1 << i)) != 0)
{
c = table[hash];
}
else
{
if (inpos >= insz)
{
break;
}
c = in[inpos++];
table[hash] = c;
}
buff[j++] = c;
hash = HASH(hash, c);
}
if (j > 0)
{
if (out != NULL)
{
memcpy(out + outpos, buff, j);
}
outpos += j;
}
}
*outsz = outpos;
}
\end{lstlisting}
\end{document}

3
include/stupidfs.h
View file

@ -130,6 +130,9 @@ struct stpdfs_inode {
#define STPDFS_INODE_SIZE sizeof(struct inode)
# define STPDFS_NDIR 7 /**< Number of direct block */
# define STPDFS_SIND 7 /**< Indirect block */
# define STPDFS_DIND 8 /**< Double indirect */
# define STPDFS_TIND 9 /**< Triple indirect */
# define STPDFS_INO_FLAG_ALOC (1 << 15)
# define STPDFS_INO_FLAG_LZP (1 << 1)

7
lib/Makefile.am
View file

@ -1,7 +0,0 @@
noinst_LIBRARIES = libstpdfs.a
AM_CFLAGS = -I$(top_srcdir)/include -I$(top_srcdir)/lib -I$(top_srcdir)
libstpdfs_a_SOURCES = block.c \
inode.c \
dir.c \
data.c \
superblock.c

89
lib/block.c
View file

@ -1,89 +0,0 @@
/**
* file: block.c
*/
#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)
{
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)
{
lseek(fd, blocknum * STPDFS_BLOCK_SIZE, SEEK_SET);
return (read(fd, data, size));
}
uint32_t
stpdfs_alloc_block(int fd, struct stpdfs_sb *sb)
{
uint32_t blocknum;
struct stpdfs_free freelist;
sb->state = STPDFS_DIRTY; /* mark state dirty */
redo:
sb->freelist.nfree--;
blocknum = sb->freelist.free[sb->freelist.nfree];
if (sb->freelist.nfree == 0 && blocknum != 0)
{
stpdfs_read(fd, blocknum, &freelist, sizeof(struct stpdfs_free));
memcpy(sb->freelist.free, &freelist, sizeof(uint32_t) * 100);
sb->freelist.nfree = freelist.nfree;
goto redo;
}
sb->time = time(NULL);
return (blocknum);
}
int
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->freelist.nfree == 100)
{
memcpy(&copy, sb->freelist.free, sizeof(uint32_t) * 100);
copy.nfree = sb->freelist.nfree;
stpdfs_write(fd, blocknum, &copy, sizeof(struct stpdfs_free));
sb->freelist.nfree = 1;
sb->freelist.free[0] = blocknum;
}
else
{
sb->freelist.free[sb->freelist.nfree++] = blocknum;
}
sb->time = time(NULL);
return (0);
}

180
lib/data.c
View file

@ -1,180 +0,0 @@
#include "stpdfs.h"
#include <stdint.h>
#include <stdlib.h>
#include <string.h>
static int
stpdfs_write_indirect(int fd, uint32_t blocknum, uint8_t *buffer, size_t size)
{
size_t i;
uint32_t zones[STPDFS_ZONES_PER_BLOCK];
size_t byte_read;
stpdfs_read(fd, blocknum, zones, sizeof(zones));
byte_read = 0;
for (i = 0; i < STPDFS_ZONES_PER_BLOCK; i++)
{
stpdfs_read(fd, zones[i], buffer, STPDFS_BLOCK_SIZE);
byte_read += STPDFS_BLOCK_SIZE;
if (byte_read >= size)
{
return (byte_read);
}
}
return (byte_read);
}
int
stpdfs_write_data(int fd, struct stpdfs_sb *sb, struct stpdfs_inode *inode, uint8_t *data)
{
size_t i;
size_t j;
size_t byte_write;
uint32_t zones1[STPDFS_ZONES_PER_BLOCK];
uint32_t zones2[STPDFS_ZONES_PER_BLOCK];
byte_write = 0;
for (i = 0; i < 7; i++)
{
if (inode->zones[i] == 0)
{
inode->zones[i] = stpdfs_alloc_block(fd, sb);
}
stpdfs_write(fd, inode->zones[i], data + byte_write, (inode->size - byte_write) >= STPDFS_BLOCK_SIZE ? STPDFS_BLOCK_SIZE : (inode->size - byte_write));
byte_write += STPDFS_BLOCK_SIZE;
if (byte_write >= inode->size)
{
return (byte_write);
}
}
/*
byte_read += stpdfs_write_indirect(fd, inode->zones[7], *buffer + byte_read, inode->size - byte_read);
if (byte_read >= inode->size)
{
return (byte_read);
}
stpdfs_read(fd, inode->zones[8], zones1, sizeof(zones1));
for (i = 0; i < STPDFS_ZONES_PER_BLOCK; i++)
{
byte_read += stpdfs_read_indirect(fd, zones1[i], *buffer + byte_read, inode->size - byte_read);
if (byte_read >= inode->size)
{
return (byte_read);
}
}
stpdfs_read(fd, inode->zones[9], zones1, sizeof(zones1));
for (i = 0; i < STPDFS_ZONES_PER_BLOCK; i++)
{
stpdfs_read(fd, zones1[i], zones2, sizeof(zones2));
for (j = 0; j < STPDFS_ZONES_PER_BLOCK; j++)
{
byte_read += stpdfs_read_indirect(fd, zones2[i], *buffer + byte_read, inode->size - byte_read);
if (byte_read >= inode->size)
{
return (byte_read);
}
}
}*/
return (byte_write);
}
static int
stpdfs_read_indirect(int fd, uint32_t blocknum, uint8_t *buffer, size_t size)
{
size_t i;
uint32_t zones[STPDFS_ZONES_PER_BLOCK];
size_t byte_read;
stpdfs_read(fd, blocknum, zones, sizeof(zones));
byte_read = 0;
for (i = 0; i < STPDFS_ZONES_PER_BLOCK; i++)
{
stpdfs_read(fd, zones[i], buffer, STPDFS_BLOCK_SIZE);
byte_read += STPDFS_BLOCK_SIZE;
if (byte_read >= size)
{
return (byte_read);
}
}
return (byte_read);
}
int
stpdfs_read_data(int fd, struct stpdfs_sb *sb, struct stpdfs_inode *inode, uint8_t **buffer)
{
size_t i;
size_t j;
size_t byte_read;
uint32_t zones1[STPDFS_ZONES_PER_BLOCK];
uint32_t zones2[STPDFS_ZONES_PER_BLOCK];
*buffer = (uint8_t *)malloc(inode->size + STPDFS_BLOCK_SIZE);
byte_read = 0;
for (i = 0; i < 7; i++)
{
stpdfs_read(fd, inode->zones[i], *buffer, STPDFS_BLOCK_SIZE);
byte_read += STPDFS_BLOCK_SIZE;
if (byte_read >= inode->size)
{
return (byte_read);
}
}
byte_read += stpdfs_read_indirect(fd, inode->zones[7], *buffer + byte_read, inode->size - byte_read);
if (byte_read >= inode->size)
{
return (byte_read);
}
stpdfs_read(fd, inode->zones[8], zones1, sizeof(zones1));
for (i = 0; i < STPDFS_ZONES_PER_BLOCK; i++)
{
byte_read += stpdfs_read_indirect(fd, zones1[i], *buffer + byte_read, inode->size - byte_read);
if (byte_read >= inode->size)
{
return (byte_read);
}
}
stpdfs_read(fd, inode->zones[9], zones1, sizeof(zones1));
for (i = 0; i < STPDFS_ZONES_PER_BLOCK; i++)
{
stpdfs_read(fd, zones1[i], zones2, sizeof(zones2));
for (j = 0; j < STPDFS_ZONES_PER_BLOCK; j++)
{
byte_read += stpdfs_read_indirect(fd, zones2[i], *buffer + byte_read, inode->size - byte_read);
if (byte_read >= inode->size)
{
return (byte_read);
}
}
}
return (byte_read);
}

18
lib/dir.c
View file

@ -1,18 +0,0 @@
#include "stpdfs.h"
#include <stdint.h>
#include <string.h>
#include <stdlib.h>
int
stpdfs_dir_add_entry(int fd, struct stpdfs_sb *sb, uint32_t inonum, const char *name, uint32_t target)
{
struct stpdfs_inode inode;
stpdfs_read_inode(fd, inonum, &inode);
if (!(inode.mode & STPDFS_S_IFDIR))
{
return (-1);
}
return (0);
}

85
lib/inode.c
View file

@ -1,85 +0,0 @@
#include "stpdfs.h"
#include <string.h>
#include <stdint.h>
uint32_t
stpdfs_locate_inode(uint32_t inode)
{
return (2 + inode / STPDFS_INODES_PER_BLOCK);
}
int
stpdfs_read_inode(int fd, uint32_t inodenum, struct stpdfs_inode *ino)
{
struct stpdfs_inode inodes[STPDFS_INODES_PER_BLOCK];
stpdfs_read(fd, 2 + inodenum / STPDFS_INODES_PER_BLOCK, (uint8_t *)&inodes, sizeof(struct stpdfs_inode) * STPDFS_INODES_PER_BLOCK);
memcpy(ino, &inodes[inodenum % STPDFS_INODES_PER_BLOCK], sizeof(struct stpdfs_inode));
return (0);
}
int
stpdfs_write_inode(int fd, uint32_t inodenum, const struct stpdfs_inode *inode)
{
struct stpdfs_inode inodes[STPDFS_INODES_PER_BLOCK];
stpdfs_read(fd, 2 + inodenum / STPDFS_INODES_PER_BLOCK, (uint8_t *)&inodes, sizeof(struct stpdfs_inode) * STPDFS_INODES_PER_BLOCK);
memcpy(&inodes[inodenum % STPDFS_INODES_PER_BLOCK], inode, sizeof(struct stpdfs_inode));
stpdfs_write(fd, 2 + inodenum / STPDFS_INODES_PER_BLOCK, (uint8_t *)&inodes, sizeof(struct stpdfs_inode) * STPDFS_INODES_PER_BLOCK);
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);
}

53
lib/stpdfs.h
View file

@ -1,53 +0,0 @@
/**
* \file stpdfs.h
*
* StupidFS
* ```
* ┌──────────┬───────────┬──────┬───┬──────┬────┬───┬────┐
* │Boot block│Super block│Inodes│...│Inodes│Data│...│Data│
* └──────────┴───────────┴──────┴───┴──────┴────┴───┴────┘
* ```
*/
#ifndef STPDFS_H
# define STPDFS_H 1
# include <stupidfs.h>
# include <stdint.h>
# include <stddef.h>
/*
* API
*/
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);
/**
* mark block as available for new allocation.
*
* \param fd file descriptor.
* \param sb pointer to \ref stpdfs_sb.
* \param blocknum block to free
*/
uint32_t stpdfs_alloc_block(int fd, struct stpdfs_sb *sb);
/**
* find a free block.
*
* \param fd file descriptor.
* \param sb pointer to \ref stpdfs_sb.
* \return block number or 0 if no block found.
*/
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);
int stpdfs_read_inode(int fd, uint32_t inodenum, struct stpdfs_inode *ino);
int stpdfs_write_inode(int fd, uint32_t inodenum, const struct stpdfs_inode *inode);
#endif /* !STPDFS_H */

36
lib/superblock.c
View file

@ -1,36 +0,0 @@
#include "stpdfs.h"
#include <time.h>
int
stpdfs_superblock_valid(const struct stpdfs_sb *sb)
{
return (sb->magic == STPDFS_SB_MAGIC && sb->revision == STPDFS_SB_REV);
}
int
stpdfs_read_superblock(int fd, struct stpdfs_sb *sb)
{
if (stpdfs_read(fd, 1, sb, sizeof(struct stpdfs_sb)) != sizeof(struct stpdfs_sb))
{
return (-1);
}
if (stpdfs_superblock_valid(sb))
{
return (0);
}
return (-1);
}
int
stpdfs_write_superblock(int fd, struct stpdfs_sb *sb)
{
sb->time = time(NULL);
if (stpdfs_write(fd, 1, sb, sizeof(struct stpdfs_sb)) != sizeof(struct stpdfs_sb))
{
return (-1);
}
return (0);
}

1
libstpdfs/Makefile.am
View file

@ -1,2 +1,3 @@
AM_CFLAGS = -I$(top_srcdir)/include -I$(top_srcdir)
noinst_LIBRARIES = libstpdfs.a
libstpdfs_a_SOURCES = super.c bio.c inode.c file.c dir.c

45
libstpdfs/file.c
View file

@ -0,0 +1,45 @@
#include <stdlib.h>
#include <libstpdfs/stpdfs.h>
static struct stpdfs_file *head = NULL;
struct stpdfs_file *
stpdfs_file_alloc(void)
{
struct stpdfs_file *f;
f = (struct stpdfs_file *)malloc(sizeof(struct stpdfs_file));
if (f == NULL)
{
return (NULL);
}
f->refcount = 1;
f->ip = NULL;
f->offset = 0;
f->next = head;
head = f;
return (f);
}
void
stpdfs_file_close(struct stpdfs_file *f)
{
struct stpdfs_file *tmp;
f->refcount--;
if (f->refcount <= 0)
{
for (tmp = head; tmp != NULL; tmp = tmp->next)
{
if (tmp->next == f)
{
tmp->next = f->next;
break;
}
}
free(f);
}
}

229
libstpdfs/inode.c
View file

@ -1,17 +1,236 @@
#include "stpdfs.h"
#include "stupidfs.h"
#include <libstpdfs/stpdfs.h>
#include <stdint.h>
#include <string.h>
#ifndef MIN
# define MIN(x, y) (((x) < (y)) ? (x) : (y))
#endif /* !MIN */
#define INODE_CACHE 50
#define IBLOCK(x) (x / STPDFS_INODES_PER_BLOCK + 2)
struct stpdfs_inode_info icache[INODE_CACHE];
static struct stpdfs_inode_info icache[INODE_CACHE] = {0};
struct inode *
stpdfs_inode_get(struct stpdfs_sb *sb, uint32_t ino)
struct stpdfs_inode_info *
stpdfs_inode_get(struct stpdfs_super_info *sbi, uint32_t inum)
{
struct stpdfs_inode_info *empty;
int idx;
empty = NULL;
for (idx = 0; idx < INODE_CACHE; idx++)
{
if (icache[idx].refcount > 0 && icache[idx].inum == inum)
{
icache[idx].refcount++;
return (&icache[idx]);
}
if (empty == NULL && icache[idx].refcount == 0)
{
empty = &icache[idx];
}
}
if (empty == NULL) return (NULL);
empty->sbi = sbi;
empty->inum = inum;
empty->refcount = 1;
empty->valid = 0;
return (empty);
}
struct stpdfs_inode_info *
stpdfs_inode_alloc(struct stpdfs_super_info *sbi)
{
uint32_t inum;
struct stpdfs_buffer *buff;
struct stpdfs_inode *dinode;
for (inum = 1; inum < sbi->sb.isize; inum++)
{
buff = stpdfs_bread(sbi->fd, IBLOCK(inum));
dinode = (struct stpdfs_inode *)buff->data + inum % STPDFS_INODES_PER_BLOCK;
if ((dinode->flags & STPDFS_INO_FLAG_ALOC) == 0)
{
dinode->flags = STPDFS_INO_FLAG_ALOC;
stpdfs_bwrite(buff);
stpdfs_brelse(buff);
return (stpdfs_inode_get(sbi, inum));
}
stpdfs_brelse(buff);
}
return (NULL);
}
struct stpdfs_dirent *
stpdfs_lookup(struct stpdfs_inode *dir, struct stpdfs_dirent *dentry, int flags)
void
stpdfs_inode_update(struct stpdfs_inode_info *ip)
{
struct stpdfs_buffer *buff;
struct stpdfs_inode *dinode;
buff = stpdfs_bread(ip->sbi->fd, IBLOCK(ip->inum));
dinode = (struct stpdfs_inode *)buff->data + ip->inum % STPDFS_INODES_PER_BLOCK;
memcpy(dinode, &ip->inode, sizeof(struct stpdfs_inode));
stpdfs_bwrite(buff);
stpdfs_brelse(buff);
}
int
stpdfs_inode_bmap(struct stpdfs_inode_info *ip, uint32_t blocknum)
{
uint32_t *addrs;
uint32_t index;
struct stpdfs_buffer *buff;
if (blocknum < STPDFS_NDIR)
{
if (ip->inode.zones[blocknum] == 0)
{
ip->inode.zones[blocknum] = stpdfs_super_balloc(ip->sbi);
}
return (ip->inode.zones[blocknum]);
}
index = blocknum - STPDFS_NDIR;
if (blocknum < (STPDFS_BLOCK_SIZE/sizeof(int32_t) + STPDFS_SIND))
{
if (ip->inode.zones[STPDFS_SIND] == 0)
{
ip->inode.zones[STPDFS_SIND] = stpdfs_super_balloc(ip->sbi);
}
buff = stpdfs_bread(ip->sbi->fd, ip->inode.zones[STPDFS_SIND]);
addrs = (uint32_t *)buff->data;
if (addrs[index] == 0)
{
addrs[index] = stpdfs_super_balloc(ip->sbi);
}
stpdfs_brelse(buff);
return (addrs[index]);
}
/* TODO double and triple ind */
return (0);
}
void
stpdfs_inode_trunc(struct stpdfs_inode_info *ip)
{
(void)ip;
}
int
stpdfs_inode_read(struct stpdfs_inode_info *ip, uint8_t *dest, size_t offset, size_t size)
{
size_t total;
size_t rd;
uint32_t zone;
struct stpdfs_buffer *buff;
if (offset > ip->inode.size)
{
return (0);
}
total = 0;
while (total < size)
{
zone = stpdfs_inode_bmap(ip, offset/STPDFS_BLOCK_SIZE);
if (zone == 0) return (total);
buff = stpdfs_bread(ip->sbi->fd, zone);
rd = MIN(size - total, STPDFS_BLOCK_SIZE - offset % STPDFS_BLOCK_SIZE);
memcpy(dest, buff->data + (offset % STPDFS_BLOCK_SIZE), rd);
stpdfs_brelse(buff);
total += rd;
offset += rd;
dest += rd;
}
return (total);
}
int
stpdfs_inode_write(struct stpdfs_inode_info *ip, const uint8_t *src, size_t offset, size_t size)
{
size_t total;
size_t rd;
uint32_t zone;
struct stpdfs_buffer *buff;
if (offset > ip->inode.size)
{
return (0);
}
total = 0;
while (total < size)
{
zone = stpdfs_inode_bmap(ip, offset/STPDFS_BLOCK_SIZE);
if (zone == 0) break;
buff = stpdfs_bread(ip->sbi->fd, zone);
rd = MIN(size - total, STPDFS_BLOCK_SIZE - offset % STPDFS_BLOCK_SIZE);
memcpy(buff->data + (offset % STPDFS_BLOCK_SIZE), src, rd);
stpdfs_bwrite(buff);
stpdfs_brelse(buff);
total += rd;
offset += rd;
src += rd;
}
if (offset > ip->inode.size)
{
ip->inode.size = offset;
}
stpdfs_inode_update(ip);
return (total);
}
struct stpdfs_inode_info *
stpdfs_dirlookup(struct stpdfs_inode_info *dp, const char *name, size_t *offset)
{
struct stpdfs_dirent dirent;
size_t idx;
if (!(dp->inode.flags & STPDFS_S_IFDIR))
{
return (NULL);
}
for (idx = 0; idx < dp->inode.size; idx += STPDFS_DIRENT_SIZE)
{
if (stpdfs_inode_read(dp, (uint8_t *)&dirent, idx, STPDFS_DIRENT_SIZE) != STPDFS_DIRENT_SIZE)
{
return (NULL);
}
if (strncmp(name, dirent.filename, STPDFS_NAME_MAX))
{
*offset = idx;
return (stpdfs_inode_get(dp->sbi, dirent.inode));
}
}
return (NULL);
}
int
stpdfs_dirlink(struct stpdfs_inode_info *dp, const char *name, uint32_t inum)
{
return (0);
}

18
libstpdfs/stpdfs.h
View file

@ -12,9 +12,21 @@ struct stpdfs_super_info {
};
struct stpdfs_inode_info {
struct stpdfs_inode ino;
int fd;
int valid;
int refcount;
uint32_t inum;
struct stpdfs_super_info *sbi;
struct stpdfs_inode inode;
};
struct stpdfs_file {
int refcount;
struct stpdfs_inode_info *ip;
size_t offset;
struct stpdfs_file *next;
};
struct stpdfs_buffer {
@ -40,6 +52,8 @@ void stpdfs_bpin(struct stpdfs_buffer *buff);
int stpdfs_read_super(struct stpdfs_super_info *sbi, int fd);
int stpdfs_super_validate(struct stpdfs_sb *sb);
int stpdfs_super_kill(struct stpdfs_super_info *sbi);
uint32_t stpdfs_super_balloc(struct stpdfs_super_info *sbi);
int stpdfs_super_bfreee(struct stpdfs_super_info *sbi, uint32_t blocknum);
uint32_t stpdfs_alloc_block(int fd, struct stpdfs_sb *sb);
int stpdfs_free_block(int fd, struct stpdfs_sb *sb, uint32_t blocknum);

73
libstpdfs/super.c
View file

@ -1,4 +1,6 @@
#include "stupidfs.h"
#include <fcntl.h>
#include <stdint.h>
#include <stdio.h>
#include <string.h>
#include <sys/stat.h>
@ -71,6 +73,77 @@ stpdfs_super_kill(struct stpdfs_super_info *sbi)
stpdfs_brelse(buff);
end:
close(sbi->fd);
return (0);
}
uint32_t
stpdfs_super_balloc(struct stpdfs_super_info *sbi)
{
uint32_t blocknum;
struct stpdfs_free freelist;
struct stpdfs_buffer *buff;
sbi->sb.state = STPDFS_DIRTY;
redo:
sbi->sb.freelist.nfree--;
blocknum = sbi->sb.freelist.free[sbi->sb.freelist.nfree];
if (sbi->sb.freelist.nfree == 0 && blocknum != 0)
{
buff = stpdfs_bread(sbi->fd, blocknum);
memcpy(&sbi->sb.freelist, buff->data, sizeof(struct stpdfs_free));
goto redo;
}
buff = stpdfs_bread(sbi->fd, 1);
memcpy(buff->data, &sbi->sb, sizeof(struct stpdfs_sb));
stpdfs_bwrite(buff);
buff = stpdfs_bread(sbi->fd, blocknum);
memset(buff->data, 0, STPDFS_BLOCK_SIZE);
stpdfs_bwrite(buff);
stpdfs_brelse(buff);
sbi->sb.time = time(NULL);
return (blocknum);
}
int
stpdfs_super_bfreee(struct stpdfs_super_info *sbi, uint32_t blocknum)
{
struct stpdfs_free copy;
struct stpdfs_buffer *buff;
if (blocknum == 0 || blocknum >= sbi->sb.fsize)
{
return (-1);
}
sbi->sb.state = STPDFS_DIRTY;
if (sbi->sb.freelist.nfree == 100)
{
buff = stpdfs_bread(sbi->fd, blocknum);
memcpy(buff->data, &sbi->sb.freelist, sizeof(struct stpdfs_free));
stpdfs_bwrite(buff);
stpdfs_brelse(buff);
sbi->sb.freelist.nfree = 1;
sbi->sb.freelist.free[0] = blocknum;
}
else
{
sbi->sb.freelist.free[sbi->sb.freelist.nfree++] = blocknum;
}
sbi->sb.time = time(NULL);
buff = stpdfs_bread(sbi->fd, 1);
memcpy(buff->data, &sbi->sb, sizeof(struct stpdfs_sb));
stpdfs_bwrite(buff);
return (0);
}

4
tools/Makefile.am
View file

@ -1,10 +1,10 @@
AM_CFLAGS = -I$(top_srcdir)/include -I$(top_srcdir)/lib -I$(top_srcdir)
LDADD = ../lib/libstpdfs.a
LDADD = ../libstpdfs/libstpdfs.a
bin_PROGRAMS = mkfs.stpd tools.stpd
mkfs_stpd_SOURCES = mkfs/main.c
mkfs_stpd_LDADD = ../lib/libstpdfs.a mkfs/bootsector.o
mkfs_stpd_LDADD = ../libstpdfs/libstpdfs.a mkfs/bootsector.o
tools_stpd_SOURCES = tools/main.c tools/ls.c tools/copy.c