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#include "fs/fs.h"
#include "fs/users.h"
#include "fs/dev.h"
/* from users.h */
struct fs_user c_user;
/* from inode.h */
inode_t c_inode;
struct fs_dev devices[FS_MOUNT_LIMIT];
/* filesystem basic implementation */
devsize_t fs_block(blk_t block)
{
// TODO
return 0;
}
devsize_t fs_inode(struct fs_inode *buf)
{
struct fs_superblock * sb;
devsize_t seek;
if (FS_USE_ROM(c_inode))
{
seek = FS_ROM_SPACE;
sb = (struct fs_superblock*) seek;
} else {
seek = 0;
if (c_inode.dev > 0x7)
panic("Invalid device"); // TODO, still to implement
sb = &devices[c_inode.dev].superblock;
}
if (c_inode.inode >= sb->imap_size)
{
// TODO, set errno
return 0; // inode doesn't exist
}
seek += sizeof(struct fs_superblock) +
sizeof(struct fs_inode) * c_inode.inode;
if (FS_USE_ROM(c_inode))
*buf = *(struct fs_inode*)seek;
else
{
/* set sio port */
sio_port = devices[c_inode.dev].port_no;
sio_seek = seek;
if (sio_read((void *)buf, INODE_META_SIZE) < INODE_META_SIZE)
{
// TODO, set errno
return 0; // cannot read to device
}
}
return seek + INODE_META_SIZE;
}
/* from fd.h */
int8_t __fd_new()
{
int8_t fd;
for (int8_t = 0; i < FD_TABLE_SIZE / 8; i++)
{
for (uint8_t bit = 0x80, j = 0; bit > 0; bit >>= 1, j++)
{
if (!(bit & fd_bmap[i]))
return i * 8 + j;
}
}
return -1;
}
/* from fd.h */
int8_t __open_c_inode(uint8_t flags)
{
/* read meta data */
struct fs_inode inode;
/* init file_desc buffer */
struct file_desc desc = {c_inode, 0};
desc.begin = fs_inode(&inode);
/* bind operations */
if (flags & OPEN_DIR)
{
/* dir handler */
if (inode.type == INODE_TYPE_DIR)
{
/* bind dir functions */
if (FS_USE_ROM(c_inode))
/* bind address space functions */
FD_BIND_AS_DIR(desc.opers)
else
/* bind serial space functions */
FD_BIND_SS_DIR(desc.opers)
} else {
// TODO, set errno
return -1; // not a directory
}
} else if (flags & OPEN_LINK) {
/* link handler */
if (inode.type == INODE_TYPE_LINK)
{
if (FS_USE_ROM(c_inode))
FD_BIND_AS_FILE(desc.opers, flags)
else
FD_BIND_SS_FILE(desc.opers, flags)
if (flags & OPEN_ERASE)
/* empty file content */
__inode_empty(desc.begin);
} else {
// TODO, set errno
return -1; // not a link
}
} else {
/* file */
if (inode.type == INODE_TYPE_FILE)
; // do nothing
else if (inode.type == INODE_TYPE_SPECIAL) {
// TODO, bind special callbacks
} else {
// TODO, set errno
return -1;
}
/* bind operations */
if (FS_USE_ROM(c_inode))
{
if (flags & OPEN_BIN)
FD_BIND_AS_BINFILE(desc.opers, flags)
else
FD_BIND_AS_FILE(desc.opers, flags)
} else {
if (flags & OPEN_BIN)
FD_BIND_SS_BINFILE(desc.opers, flags)
else
FD_BIND_SS_FILE(desc.opers, flags)
}
}
/* find a free fd space */
int8_t fd = __fd_new();
if (fd < 0)
{
// TODO, set errno, fd not available
} else
fd_table[fd] = desc; // copy buffer into the table
return fd;
}
inode_t fs_rec_path(const char *path);
inode_t fs_parse_path(const char *path)
{
inode_t ino, cwd = c_inode;
switch (path[0])
{
case '0':
FS_INODE_NULL(ino)
return ino;
case '/':
FS_INODE_ROOT(ino)
c_inode = ino; // set cwd to root
path++;
break;
case '~':
if (path[1] = '/')
{
c_inode.dev = FS_DEV_ROM;
c_inode.inode = c_user.home; // set cwd to home
path += 2;
}
break;
}
ino = fs_rec_path(path);
c_inode = cwd;
return ino;
}
inode_t fs_rec_path(const char *path)
{
devsize_t inode = fs_inode(c_inode.inode);
inode_t rel;
if (!inode) // if not exists
{
FS_INODE_NULL(rel)
return rel;
}
// TODO, check if dir or file
// TODO, if dir, find name
// TODO, set fs_cwd to new inode
// TODO, recall fs_rec_path
}
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