wip: add support or reading symlinks in resolve_path
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parent
552e574cde
commit
db6187be39
140
src/fs.c
140
src/fs.c
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@ -907,18 +907,21 @@ fs_remove_fname_from_directory_finish:
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return 0;
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}
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static void resolve_path(struct resolved_path *rp, char *path, unsigned int params)
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static void resolve_path(struct resolved_path * const rp, const char * const original_path, const unsigned int params)
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{
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rp->parent_inode_ptr = -1;
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rp->target_inode_ptr = -1;
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int path_len = strlen(path);
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int path_len = strlen(original_path);
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if (!path_len) {
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pr_err("no path specified\n");
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return;
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}
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char path[FS_MAX_PATH_LEN+1];
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strcpy(path, original_path);
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if (!strcmp(path, "/")) {
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rp->parent_inode_ptr = 0;
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rp->target_inode_ptr = 0;
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@ -961,25 +964,54 @@ static void resolve_path(struct resolved_path *rp, char *path, unsigned int para
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if (i+1 == path_len)
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continue;
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{
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int res = find_fname_in_directory(current_inode_ptr, next_fname);
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if (res < 0) {
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pr_warn("directory '%s' does not exist\n", next_fname);
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int res = find_fname_in_directory(current_inode_ptr, next_fname);
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if (res < 0) {
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pr_warn("directory '%s' does not exist\n", next_fname);
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rp->parent_inode_ptr = -1;
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break;
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}
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struct fs_inode d;
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read_block(read_inode_ptr(res), &d);
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if (d.ftype == SYMLINK) {
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char symlink_path[FS_MAX_PATH_LEN+1];
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int symlink_path_len = read_symlink(res, symlink_path);
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if (symlink_path_len < 0) {
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pr_warn("broken symlink\n");
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rp->parent_inode_ptr = -1;
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break;
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}
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{
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struct fs_inode d;
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read_block(read_inode_ptr(res), &d);
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if (d.ftype == REGULAR) {
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pr_warn("'%s' is a regular file\n", next_fname);
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rp->parent_inode_ptr = -1;
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break;
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}
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if (!strcmp(symlink_path, "/")) {
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rp->parent_inode_ptr = 0;
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rp->target_inode_ptr = 0;
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strcpy(rp->parent_fname, "/");
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strcpy(rp->target_fname, "/");
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return;
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}
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if (symlink_path[0] == '/') {
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res = 0;
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memmove(&(path[symlink_path_len]), &(path[i+1]), path_len-i-1);
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path[symlink_path_len-1] = '/';
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memcpy(path, &(symlink_path[1]), symlink_path_len-1);
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path_len = symlink_path_len + path_len - i + 1;
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i = -1;
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strcpy(next_fname, "/");
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} else {
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memmove(&(path[symlink_path_len+1]), &(path[i+1]), path_len-i-1);
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path[symlink_path_len] = '/';
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memcpy(path, symlink_path, symlink_path_len);
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path_len = symlink_path_len + path_len - i + 2;
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i = -1;
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}
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} else if (d.ftype == REGULAR) {
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pr_warn("'%s' is a regular file\n", next_fname);
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rp->parent_inode_ptr = -1;
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break;
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} else if (d.ftype == DIRECTORY) {
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pr("Found directory '%s'\n", next_fname);
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current_inode_ptr = res;
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rp->parent_inode_ptr = res;
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@ -1002,6 +1034,17 @@ static void resolve_path(struct resolved_path *rp, char *path, unsigned int para
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if (res < 0) {
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pr_warn("target fname '%s' does not exist\n", next_fname);
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rp->target_inode_ptr = -1;
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}
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struct fs_inode i;
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read_block(res, &i);
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if (i.ftype == SYMLINK && (params & FOLLOW_LAST_SYMLINK))
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struct
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/*
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rp->target_inode_ptr = res;
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strcpy(rp->target_fname, next_fname);
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*/
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} else {
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rp->target_inode_ptr = res;
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strcpy(rp->target_fname, next_fname);
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@ -1631,6 +1674,73 @@ int fs_ln(void *d)
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return 0;
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}
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static int read_symlink(int symlink_inode_ptr, char *path)
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{
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struct fs_inode i;
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read_block(read_inode_ptr(symlink_inode_ptr), &i);
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path[0] = '\0';
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int bytes_read = 0;
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for (int j = 0; j < BLOCK_ADDRESSES_PER_INODE; j++) {
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if (!i.blocks[j]) {
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pr_err("inode size (%d) indicates existing block but it's address is absent in inode, symlink at inode_ptr=%d might be broken\n",
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i.size, symlink_inode_ptr);
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return -1;
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}
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char data[FS_BLOCK_SIZE];
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read_block(i.blocks[j], data);
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if (i.size - bytes_read < FS_BLOCK_SIZE) {
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memcpy(&(path[bytes_read]), data, i.size - bytes_read);
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bytes_read = i.size;
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path[bytes_read] = '\0';
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} else {
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memcpy(&(path[bytes_read]), data, FS_BLOCK_SIZE);
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bytes_read += FS_BLOCK_SIZE;
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path[bytes_read] = '\0';
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}
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if (i.size == bytes_read)
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goto finish_reading;
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}
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for (unsigned int next_ext = i.next_extension; ; ) {
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struct fs_inode_extension ext;
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read_block(next_ext, &ext);
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for (int j = 0; j < BLOCK_ADDRESSES_PER_INODE_EXTENSION; j++) {
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if (!ext.blocks[j]) {
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pr_err("inode size (%d) indicates existing block but it's address is absent in inode extension, symlink at inode_ptr=%d might be broken\n",
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i.size, symlink_inode_ptr);
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return -1;
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}
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char data[FS_BLOCK_SIZE];
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read_block(ext.blocks[j], data);
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if (i.size - bytes_read < FS_BLOCK_SIZE) {
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memcpy(&(path[bytes_read]), data, i.size - bytes_read);
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bytes_read = i.size;
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path[bytes_read] = '\0';
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} else {
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memcpy(&(path[bytes_read]), data, FS_BLOCK_SIZE);
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bytes_read += FS_BLOCK_SIZE;
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path[bytes_read] = '\0';
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}
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if (i.size == bytes_read)
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goto finish_reading;
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}
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next_ext = ext.next_extension;
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}
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finish_reading:
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return bytes_read;
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}
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int fs_symlink(void *d)
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{
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char *target_path = ((char **) d)[0];
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