feat(lib): read superblock

.gitignore

@@ -31,3 +31,5 @@ Debug/
 html/
 .dirstamp
 mkfs.stpd
+*.gz
+*.pdf

Doxyfile

@@ -2417,7 +2417,7 @@ ENABLE_PREPROCESSING   = YES
 # The default value is: NO.
 # This tag requires that the tag ENABLE_PREPROCESSING is set to YES.
 
-MACRO_EXPANSION        = NO
+MACRO_EXPANSION        = YES
 
 # If the EXPAND_ONLY_PREDEF and MACRO_EXPANSION tags are both set to YES then
 # the macro expansion is limited to the macros specified with the PREDEFINED and
@@ -2425,7 +2425,7 @@ MACRO_EXPANSION        = NO
 # The default value is: NO.
 # This tag requires that the tag ENABLE_PREPROCESSING is set to YES.
 
-EXPAND_ONLY_PREDEF     = NO
+EXPAND_ONLY_PREDEF     = YES
 
 # If the SEARCH_INCLUDES tag is set to YES, the include files in the
 # INCLUDE_PATH will be searched if a #include is found.
@@ -2458,8 +2458,7 @@ INCLUDE_FILE_PATTERNS  =
 # recursively expanded use the := operator instead of the = operator.
 # This tag requires that the tag ENABLE_PREPROCESSING is set to YES.
 
-PREDEFINED             =
+PREDEFINED             = __attribute__(x)=
-
 # If the MACRO_EXPANSION and EXPAND_ONLY_PREDEF tags are set to YES then this
 # tag can be used to specify a list of macro names that should be expanded. The
 # macro definition that is found in the sources will be used. Use the PREDEFINED

docs/book/main.tex

@@ -85,10 +85,9 @@ struct stpdfs_sb {
 	uint32_t fsize;
 	uint32_t free[100];
 	uint8_t nfree;
-	uint8_t flock;
+	uint8_t revision;
-	uint8_t ilock;
+	uint8_t state;
-	uint8_t fmod;
+	uint64_t time;
-	uint32_t time[2];
 };
 	\end{lstlisting}
 
@@ -97,13 +96,14 @@ struct stpdfs_sb {
 	\begin{lstlisting}[language=C]
 struct inode {
 	uint16_t mode;
-	uint8_t nlink;
+	uint16_t nlink;
-	uint8_t uid;
+	uint16_t uid;
-	uint8_t gid;
+	uint16_t gid;
+	uint16_t flags;
 	uint32_t size;
-	uint16_t addr[8];
+	uint32_t zones[10];
-	uint32_t actime[2];
+	uint64_t actime;
-	uint32_t modtime[2];
+	uint64_t modtime;
 };
 	\end{lstlisting}
 	\appendix

lib/Makefile.am

@@ -1,2 +1,2 @@
 noinst_LIBRARIES = libstpdfs.a
-libstpdfs_a_SOURCES = codec/base64.c
+libstpdfs_a_SOURCES = block.c superblock.c codec/base64.c

lib/block.c

@@ -0,0 +1,26 @@
+#include "stpdfs.h"
+#include <stdint.h>
+
+size_t
+stpdfs_write(int fd, uint32_t blocknum, void *data, size_t size)
+{
+	return (0);
+}
+
+size_t
+stpdfs_read(int fd, uint32_t blocknum, void *data, size_t size)
+{
+	return (0);
+}
+
+uint32_t
+stpdfs_alloc_block(int fd)
+{
+	return (0);
+}
+
+int
+stpdfs_free_block(int fd)
+{
+	return (0);
+}

lib/compression/lzp.c

@@ -0,0 +1,57 @@
+/*
+        ; hash(h, x) (h = (h << 4) ^ x)
+
+        section '.code' code
+
+        ; xor hash, hash
+        ; xor mask, mask
+        ; j = 1
+        ; while (insz > 0)
+        ; {
+        ;    if (ecx == 8)
+        ;    {
+        ;       mov [out], mask
+        ;       xor ecx, ecx
+        ;       xor mask, mask
+        ;       j = 1;
+        ;    }
+        ;    c = in[inpos++]
+        ;    if (c == table[hash])
+        ;    {
+        ;        mask |= 1 << ecx
+        ;    }
+        ;    else
+        ;    {
+        ;        table[hash] = c
+        ;        out[j] = c;
+        ;    }
+        ;    HASH(hash, c)
+        ;    ecx++;
+        ; }
+*/
+#include <stdint.h>
+
+#define LZP_HASH_ORDER 16
+#define LZP_HASH_SIZE  (1 << LZP_HASH_ORDER)
+
+#define HASH(h, x) ((h << 4) ^ x)
+
+void
+lzp_compress()
+{
+	uint32_t hash = 0;
+	uint32_t mask = 0;
+	char c;
+	uint8_t table[LZP_HASH_SIZE] = { 0 };
+
+	while (1)
+	{
+		hash = HASH(hash, c);
+	}
+}
+
+void
+lzp_decompress()
+{
+	
+}

lib/crypto/xchacha12.c

@@ -1,57 +0,0 @@
-/*
-        ; hash(h, x) (h = (h << 4) ^ x)
-
-        section '.code' code
-
-        ; xor hash, hash
-        ; xor mask, mask
-        ; j = 1
-        ; while (insz > 0)
-        ; {
-        ;    if (ecx == 8)
-        ;    {
-        ;       mov [out], mask
-        ;       xor ecx, ecx
-        ;       xor mask, mask
-        ;       j = 1;
-        ;    }
-        ;    c = in[inpos++]
-        ;    if (c == table[hash])
-        ;    {
-        ;        mask |= 1 << ecx
-        ;    }
-        ;    else
-        ;    {
-        ;        table[hash] = c
-        ;        out[j] = c;
-        ;    }
-        ;    HASH(hash, c)
-        ;    ecx++;
-        ; }
-*/
-#include <stdint.h>
-
-#define LZP_HASH_ORDER 16
-#define LZP_HASH_SIZE  (1 << LZP_HASH_ORDER)
-
-#define HASH(h, x) ((h << 4) ^ x)
-
-void
-lzp_compress()
-{
-	uint32_t hash = 0;
-	uint32_t mask = 0;
-	char c;
-	uint8_t table[LZP_HASH_SIZE] = { 0 };
-
-	while (1)
-	{
-		hash = HASH(hash, c);
-	}
-}
-
-void
-lzp_decompress()
-{
-	
-}

lib/inode.c

@@ -0,0 +1,10 @@
+#include "stpdfs.h"
+
+uint32_t
+alloc_inode(int fd)
+{
+	uint32_t start = 1;
+	uint32_t block;
+
+	return (0);
+}

lib/stpdfs.h

@@ -2,60 +2,90 @@
 # define STPDFS_H 1
 
 # include <stdint.h>
+# include <stddef.h>
 
 # define STPDFS_SB_MAGIC 0x44505453
+# define STPDFS_SB_REV   STPDFS_SB_REV_1
+# define STPDFS_SB_REV_1 1
 
 # define STPDFS_BLOCK_SIZE_BITS 9
 # define STPDFS_BLOCK_SIZE (1 << STPDFS_BLOCK_SIZE_BITS)
 
-# define STPDFS_NAME_MAX 255
+# define STPDFS_NAME_MAX 28
 
 # define STPDFS_INODES_PER_BLOCK (STPDFS_BLOCK_SIZE / (sizeof(struct stpdfs_inode)))
 
 # define STPDFS_ROOT_INO 1
 
-# define STPDFS_LZP_COMPRESSION (1 << 0)
+# define STPDFS_INO_FLAG_ALOC (1 << 15)
-# define STPDFS_FILE_ENCRYPTION (1 << 1)
+# define STPDFS_INO_FLAG_LZP  (1 << 0)
+# define STPDFS_INO_FLAG_ENC  (1 << 1)
+
+# define STPDFS_S_IFMT   0xF000
+# define STPDFS_S_IFSOCK 0xA000
+# define STPDFS_S_IFLNK  0xC000
+# define STPDFS_S_IFREG  0x8000
+# define STPDFS_S_IFBLK  0x6000
+# define STPDFS_S_IFDIR  0x4000
 
 struct stpdfs_free {
 	uint32_t free[100];
 	uint8_t nfree;
 } __attribute__((packed));
 
+enum stpdfs_state {
+	STPDFS_CLEANLY_UNMOUNTED = 0,
+	STPDFS_ERROR             = 1
+};
+
 /**
  * \brief StupidFS Superblock
  */
 struct stpdfs_sb {
-	uint32_t magic;
+	uint32_t magic; /**< MUST be \ref STPDFS_SB_MAGIC */
 	uint32_t isize; /**< size in block of the I list */
 	uint32_t fsize; /**< size in block of the entire volume */
 	uint32_t free[100];
 	uint8_t nfree; /**< number of free block (0-100) */
-	uint8_t flock;
+	uint8_t revision; /**< MUST be \ref STPDFS_SB_REV */
-	uint8_t ilock;
+	uint16_t state; /**<  \see stpdfs_state */
-	uint8_t fmod;
+	uint64_t time; /**< last time the superblock was modified */
-	uint64_t time;
 } __attribute__((packed));
 
+#define STPDFS_SB_SIZE sizeof(struct stpdfs_sb)
+
 /**
  * \brief StupidFS I-node
  */
 struct stpdfs_inode {
 	uint16_t mode; /**< file mode */
-	uint8_t nlink; /**< link count */
+	uint16_t nlink; /**< link count */
-	uint8_t uid;   /**< owner user id */
+	uint16_t uid;   /**< owner user id */
-	uint8_t gid;   /**< group id */
+	uint16_t gid;   /**< group id */
+	uint16_t flags;
 	uint32_t size;
 	uint32_t zones[10];
-	uint32_t actime[2];
+	uint64_t actime;
-	uint32_t modtime[2];
+	uint64_t modtime;
 } __attribute__((packed));
 
-#define INODE_SIZE sizeof(struct inode)
+#define STPDFS_INODE_SIZE sizeof(struct inode)
 
-struct file {
+struct stpdfs_dirent {
 	uint32_t inode;
-	char filename[32];
+	char filename[STPDFS_NAME_MAX];
 };
 
+/*
+ * 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);
+
+/* superblock.c */
+int stpdfs_superblock_valid(const struct stpdfs_sb *sb);
+int stpdfs_read_superblock(int fd, struct stpdfs_sb *sb);
+
+
 #endif /* !STPDFS_H */

lib/superblock.c

@@ -0,0 +1,36 @@
+#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);
+}

tools/mkfs/main.c

@@ -1,6 +1,7 @@
 #include <stdio.h>
 #include <stdlib.h>
 #include <string.h>
+#include <assert.h>
 #include <stpdfs.h>
 #include <sys/types.h>
 #include <sys/stat.h>
@@ -73,12 +74,39 @@ 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()
 {
 	struct stat statbuf;
+	struct stpdfs_dirent rootdirent[2];
 	int fd;
 	int dev_block;
+	int idx;
+	struct stpdfs_inode inds[STPDFS_INODES_PER_BLOCK];
+	struct stpdfs_free freebuff;
+	int freeblock;
+	int nextfree;
 
 	if (stat(device, &statbuf) < 0)
 	{
@@ -115,13 +143,46 @@ mkfs()
 	write_block(fd, NULL, 0);
 
 	super.magic = STPDFS_SB_MAGIC;
+	super.revision = STPDFS_SB_REV;
 	super.isize = inodes / STPDFS_INODES_PER_BLOCK;
 	super.fsize = blocks;
+	super.nfree = 0;
 
+	/* 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++)
+	{
+		write_block(fd, &inds, sizeof(struct stpdfs_inode) * STPDFS_INODES_PER_BLOCK);
+	}
+
+	freeblock = blocks - (inodes + 2);
+	for (nextfree = super.isize + 3; nextfree < freeblock; nextfree++)
+	{
+		add_free_block(fd, nextfree);
+	}
+
+	strcpy(rootdirent[0].filename, ".");
+	rootdirent[1].inode = 1;
+	strcpy(rootdirent[1].filename, "..");
+	rootdirent[1].inode = 1;
+
+	/* 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));
 
+	printf("StupidFS: %u blocks (%u Inodes)\n", super.fsize, super.isize);
+
 	close(fd);
 
 	return (EXIT_SUCCESS);