| 1,5 → 1,5 |
|---|
| /* |
| * Copyright (c) 2007 Jakub Jermar |
| * Copyright (c) 2008 Jakub Jermar |
| * All rights reserved. |
| * |
| * Redistribution and use in source and binary forms, with or without |
| 40,6 → 40,8 |
|---|
| #include <async.h> |
| #include <ipc/ipc.h> |
| #include <as.h> |
| #include <assert.h> |
| #include <dirent.h> |
| |
| /** Register file system server. |
| * |
| 120,5 → 122,153 |
|---|
| return IPC_GET_RETVAL(answer); |
| } |
| |
| void libfs_lookup(libfs_ops_t *ops, int fs_handle, ipc_callid_t rid, |
| ipc_call_t *request) |
| { |
| unsigned next = IPC_GET_ARG1(*request); |
| unsigned last = IPC_GET_ARG2(*request); |
| int dev_handle = IPC_GET_ARG3(*request); |
| int lflag = IPC_GET_ARG4(*request); |
| |
| if (last < next) |
| last += PLB_SIZE; |
| |
| void *cur = ops->root_get(); |
| void *tmp = ops->child_get(cur); |
| |
| if (ops->plb_get_char(next) == '/') |
| next++; /* eat slash */ |
| |
| char component[NAME_MAX + 1]; |
| int len = 0; |
| while (tmp && next <= last) { |
| |
| /* collect the component */ |
| if (ops->plb_get_char(next) != '/') { |
| if (len + 1 == NAME_MAX) { |
| /* comopnent length overflow */ |
| ipc_answer_0(rid, ENAMETOOLONG); |
| return; |
| } |
| component[len++] = ops->plb_get_char(next); |
| next++; /* process next character */ |
| if (next <= last) |
| continue; |
| } |
| |
| assert(len); |
| component[len] = '\0'; |
| next++; /* eat slash */ |
| len = 0; |
| |
| /* match the component */ |
| while (tmp && !ops->match(tmp, component)) |
| tmp = ops->sibling_get(tmp); |
| |
| /* handle miss: match amongst siblings */ |
| if (!tmp) { |
| if ((next > last) && (lflag & L_CREATE)) { |
| /* no components left and L_CREATE specified */ |
| if (!ops->is_directory(cur)) { |
| ipc_answer_0(rid, ENOTDIR); |
| return; |
| } |
| void *nodep = ops->create(lflag); |
| if (nodep) { |
| if (!ops->link(cur, nodep, component)) { |
| ops->destroy(nodep); |
| ipc_answer_0(rid, ENOSPC); |
| } else { |
| ipc_answer_5(rid, EOK, |
| fs_handle, dev_handle, |
| ops->index_get(nodep), 0, |
| ops->lnkcnt_get(nodep)); |
| } |
| } else { |
| ipc_answer_0(rid, ENOSPC); |
| } |
| return; |
| } |
| ipc_answer_0(rid, ENOENT); |
| return; |
| } |
| |
| /* descend one level */ |
| cur = tmp; |
| tmp = ops->child_get(tmp); |
| } |
| |
| /* handle miss: excessive components */ |
| if (!tmp && next <= last) { |
| if (lflag & L_CREATE) { |
| if (!ops->is_directory(cur)) { |
| ipc_answer_0(rid, ENOTDIR); |
| return; |
| } |
| |
| /* collect next component */ |
| while (next <= last) { |
| if (ops->plb_get_char(next) == '/') { |
| /* more than one component */ |
| ipc_answer_0(rid, ENOENT); |
| return; |
| } |
| if (len + 1 == NAME_MAX) { |
| /* component length overflow */ |
| ipc_answer_0(rid, ENAMETOOLONG); |
| return; |
| } |
| component[len++] = ops->plb_get_char(next); |
| next++; /* process next character */ |
| } |
| assert(len); |
| component[len] = '\0'; |
| len = 0; |
| |
| void *nodep = ops->create(lflag); |
| if (nodep) { |
| if (!ops->link(cur, nodep, component)) { |
| ops->destroy(nodep); |
| ipc_answer_0(rid, ENOSPC); |
| } else { |
| ipc_answer_5(rid, EOK, |
| fs_handle, dev_handle, |
| ops->index_get(nodep), 0, |
| ops->lnkcnt_get(nodep)); |
| } |
| } else { |
| ipc_answer_0(rid, ENOSPC); |
| } |
| return; |
| } |
| ipc_answer_0(rid, ENOENT); |
| return; |
| } |
| |
| /* handle hit */ |
| if (lflag & L_DESTROY) { |
| unsigned old_lnkcnt = ops->lnkcnt_get(cur); |
| int res = ops->unlink(cur); |
| ipc_answer_5(rid, (ipcarg_t)res, fs_handle, dev_handle, |
| ops->index_get(cur), ops->size_get(cur), old_lnkcnt); |
| return; |
| } |
| if ((lflag & (L_CREATE | L_EXCLUSIVE)) == (L_CREATE | L_EXCLUSIVE)) { |
| ipc_answer_0(rid, EEXIST); |
| return; |
| } |
| if ((lflag & L_FILE) && (ops->is_directory(cur))) { |
| ipc_answer_0(rid, EISDIR); |
| return; |
| } |
| if ((lflag & L_DIRECTORY) && (ops->is_file(cur))) { |
| ipc_answer_0(rid, ENOTDIR); |
| return; |
| } |
| |
| ipc_answer_5(rid, EOK, fs_handle, dev_handle, ops->index_get(cur), |
| ops->size_get(cur), ops->lnkcnt_get(cur)); |
| } |
| |
| /** @} |
| */ |