| 40,240 → 40,12 |
|---|
| #include <async.h> |
| #include <errno.h> |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <string.h> |
| #include <ctype.h> |
| #include <bool.h> |
| #include <futex.h> |
| #include <libadt/list.h> |
| #include "vfs.h" |
| |
| |
| #define dprintf(...) printf(__VA_ARGS__) |
| |
| atomic_t fs_head_futex = FUTEX_INITIALIZER; |
| link_t fs_head; |
| |
| /** Verify the VFS info structure. |
| * |
| * @param info Info structure to be verified. |
| * |
| * @return Non-zero if the info structure is sane, zero otherwise. |
| */ |
| static bool vfs_info_sane(vfs_info_t *info) |
| { |
| int i; |
| |
| /* |
| * Check if the name is non-empty and is composed solely of ASCII |
| * characters [a-z]+[a-z0-9_-]*. |
| */ |
| if (!islower(info->name[0])) { |
| dprintf("The name doesn't start with a lowercase character.\n"); |
| return false; |
| } |
| for (i = 1; i < FS_NAME_MAXLEN; i++) { |
| if (!(islower(info->name[i]) || isdigit(info->name[i])) && |
| (info->name[i] != '-') && (info->name[i] != '_')) { |
| if (info->name[i] == '\0') { |
| break; |
| } else { |
| dprintf("The name contains illegal " |
| "characters.\n"); |
| return false; |
| } |
| } |
| } |
| |
| |
| /* |
| * Check if the FS implements mandatory VFS operations. |
| */ |
| if (info->ops[IPC_METHOD_TO_VFS_OP(VFS_REGISTER)] != VFS_OP_DEFINED) { |
| dprintf("Operation VFS_REGISTER not defined by the client.\n"); |
| return false; |
| } |
| if (info->ops[IPC_METHOD_TO_VFS_OP(VFS_MOUNT)] != VFS_OP_DEFINED) { |
| dprintf("Operation VFS_MOUNT not defined by the client.\n"); |
| return false; |
| } |
| if (info->ops[IPC_METHOD_TO_VFS_OP(VFS_UNMOUNT)] != VFS_OP_DEFINED) { |
| dprintf("Operation VFS_UNMOUNT not defined by the client.\n"); |
| return false; |
| } |
| if (info->ops[IPC_METHOD_TO_VFS_OP(VFS_LOOKUP)] != VFS_OP_DEFINED) { |
| dprintf("Operation VFS_LOOKUP not defined by the client.\n"); |
| return false; |
| } |
| if (info->ops[IPC_METHOD_TO_VFS_OP(VFS_OPEN)] != VFS_OP_DEFINED) { |
| dprintf("Operation VFS_OPEN not defined by the client.\n"); |
| return false; |
| } |
| if (info->ops[IPC_METHOD_TO_VFS_OP(VFS_CLOSE)] != VFS_OP_DEFINED) { |
| dprintf("Operation VFS_CLOSE not defined by the client.\n"); |
| return false; |
| } |
| if (info->ops[IPC_METHOD_TO_VFS_OP(VFS_READ)] != VFS_OP_DEFINED) { |
| dprintf("Operation VFS_READ not defined by the client.\n"); |
| return false; |
| } |
| |
| /* |
| * Check if each operation is either not defined, defined or default. |
| */ |
| for (i = VFS_FIRST; i < VFS_LAST; i++) { |
| if ((info->ops[IPC_METHOD_TO_VFS_OP(i)] != VFS_OP_NULL) && |
| (info->ops[IPC_METHOD_TO_VFS_OP(i)] != VFS_OP_DEFAULT) && |
| (info->ops[IPC_METHOD_TO_VFS_OP(i)] != VFS_OP_DEFINED)) { |
| dprintf("Operation info not understood.\n"); |
| return false; |
| } |
| } |
| return true; |
| } |
| |
| /** VFS_REGISTER protocol function. |
| * |
| * @param rid Hash of the call with the request. |
| * @param request Call structure with the request. |
| */ |
| static void vfs_register(ipc_callid_t rid, ipc_call_t *request) |
| { |
| ipc_callid_t callid; |
| ipc_call_t call; |
| int rc; |
| size_t size; |
| |
| dprintf("Processing VFS_REGISTER request received from %p.\n", |
| request->in_phone_hash); |
| |
| /* |
| * The first call has to be IPC_M_DATA_SEND in which we receive the |
| * VFS info structure from the client FS. |
| */ |
| if (!ipc_data_receive(&callid, &call, NULL, &size)) { |
| /* |
| * The client doesn't obey the same protocol as we do. |
| */ |
| dprintf("Receiving of VFS info failed.\n"); |
| ipc_answer_fast(callid, EINVAL, 0, 0); |
| ipc_answer_fast(rid, EINVAL, 0, 0); |
| return; |
| } |
| |
| dprintf("VFS info received, size = %d\n", size); |
| |
| /* |
| * We know the size of the VFS info structure. See if the client |
| * understands this easy concept too. |
| */ |
| if (size != sizeof(vfs_info_t)) { |
| /* |
| * The client is sending us something, which cannot be |
| * the info structure. |
| */ |
| dprintf("Received VFS info has bad size.\n"); |
| ipc_answer_fast(callid, EINVAL, 0, 0); |
| ipc_answer_fast(rid, EINVAL, 0, 0); |
| return; |
| } |
| fs_info_t *fs_info; |
| |
| /* |
| * Allocate and initialize a buffer for the fs_info structure. |
| */ |
| fs_info = (fs_info_t *) malloc(sizeof(fs_info_t)); |
| if (!fs_info) { |
| dprintf("Could not allocate memory for FS info.\n"); |
| ipc_answer_fast(callid, ENOMEM, 0, 0); |
| ipc_answer_fast(rid, ENOMEM, 0, 0); |
| return; |
| } |
| link_initialize(&fs_info->fs_link); |
| |
| rc = ipc_data_deliver(callid, &call, &fs_info->vfs_info, size); |
| if (rc != EOK) { |
| dprintf("Failed to deliver the VFS info into our AS, rc=%d.\n", |
| rc); |
| free(fs_info); |
| ipc_answer_fast(callid, rc, 0, 0); |
| ipc_answer_fast(rid, rc, 0, 0); |
| return; |
| } |
| |
| dprintf("VFS info delivered.\n"); |
| |
| if (!vfs_info_sane(&fs_info->vfs_info)) { |
| free(fs_info); |
| ipc_answer_fast(callid, EINVAL, 0, 0); |
| ipc_answer_fast(rid, EINVAL, 0, 0); |
| return; |
| } |
| |
| futex_down(&fs_head_futex); |
| |
| /* |
| * Check for duplicit registrations. |
| */ |
| link_t *cur; |
| for (cur = fs_head.next; cur != &fs_head; cur = cur->next) { |
| fs_info_t *fi = list_get_instance(cur, fs_info_t, |
| fs_link); |
| /* TODO: replace strcmp with strncmp once we have it */ |
| if (strcmp(fs_info->vfs_info.name, fi->vfs_info.name) == 0) { |
| /* |
| * We already register a fs like this. |
| */ |
| dprintf("FS is already registered.\n"); |
| futex_up(&fs_head_futex); |
| free(fs_info); |
| ipc_answer_fast(callid, EEXISTS, 0, 0); |
| ipc_answer_fast(rid, EEXISTS, 0, 0); |
| return; |
| } |
| } |
| |
| /* |
| * Add fs_info to the list of registered FS's. |
| */ |
| dprintf("Adding FS into the registered list.\n"); |
| list_append(&fs_info->fs_link, &fs_head); |
| |
| /* |
| * ACK receiving a properly formatted, non-duplicit vfs_info. |
| */ |
| ipc_answer_fast(callid, EOK, 0, 0); |
| |
| /* |
| * Now we want the client to send us the IPC_M_CONNECT_TO_ME call so |
| * that a callback connection is created and we have a phone through |
| * which to forward VFS requests to it. |
| */ |
| callid = async_get_call(&call); |
| if (IPC_GET_METHOD(call) != IPC_M_CONNECT_TO_ME) { |
| dprintf("Unexpected call, method = %d\n", IPC_GET_METHOD(call)); |
| list_remove(&fs_info->fs_link); |
| futex_up(&fs_head_futex); |
| free(fs_info); |
| ipc_answer_fast(callid, EINVAL, 0, 0); |
| ipc_answer_fast(rid, EINVAL, 0, 0); |
| return; |
| } |
| fs_info->phone = IPC_GET_ARG3(call); |
| ipc_answer_fast(callid, EOK, 0, 0); |
| |
| dprintf("Callback connection to FS created.\n"); |
| |
| futex_up(&fs_head_futex); |
| |
| /* |
| * That was it. The FS has been registered. |
| */ |
| ipc_answer_fast(rid, EOK, 0, 0); |
| dprintf("\"%s\" filesystem successfully registered.\n", |
| fs_info->vfs_info.name); |
| } |
| |
| static void vfs_connection(ipc_callid_t iid, ipc_call_t *icall) |
| { |
| bool keep_on_going = 1; |