diff options
Diffstat (limited to '')
| -rw-r--r-- | sw/z80/kernel/fs/fs.c | 236 |
1 files changed, 236 insertions, 0 deletions
diff --git a/sw/z80/kernel/fs/fs.c b/sw/z80/kernel/fs/fs.c new file mode 100644 index 0000000..584f934 --- /dev/null +++ b/sw/z80/kernel/fs/fs.c @@ -0,0 +1,236 @@ +#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 +} |