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Rev 2546 Rev 2549
Line 49... Line 49...
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atomic_t plb_futex = FUTEX_INITIALIZER;
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atomic_t plb_futex = FUTEX_INITIALIZER;
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link_t plb_head;    /**< PLB entry ring buffer. */
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link_t plb_head;    /**< PLB entry ring buffer. */
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uint8_t *plb = NULL;
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uint8_t *plb = NULL;
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/** Perform a path lookup.
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 *
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 * @param path      Path to be resolved; it needn't be an ASCIIZ string.
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 * @param len       Number of path characters pointed by path.
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 * @param result    Empty node structure where the result will be stored.
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 * @param altroot   If non-empty, will be used instead of rootfs as the root
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 *          of the whole VFS tree.
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 *
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 * @return      EOK on success or an error code from errno.h.
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 */
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int vfs_lookup_internal(char *path, size_t len, vfs_node_t *result)
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int vfs_lookup_internal(char *path, size_t len, vfs_node_t *result,
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    vfs_node_t *altroot)
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{
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{
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    vfs_node_t *root;
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    if (!len)
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    if (!len)
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        return EINVAL;
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        return EINVAL;
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    if (altroot)
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        root = altroot;
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    else
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        root = rootfs;
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    if (!rootfs)
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    if (!root)
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        return ENOENT;
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        return ENOENT;
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    futex_down(&plb_futex);
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    futex_down(&plb_futex);
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    plb_entry_t entry;
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    plb_entry_t entry;
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    memcpy(&plb[first], path, cnt1);
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    memcpy(&plb[first], path, cnt1);
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    memcpy(plb, &path[cnt1], cnt2);
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    memcpy(plb, &path[cnt1], cnt2);
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    ipc_call_t answer;
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    ipc_call_t answer;
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    int phone = vfs_grab_phone(rootfs->fs_handle);
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    int phone = vfs_grab_phone(root->fs_handle);
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    aid_t req = async_send_3(phone, VFS_LOOKUP, (ipcarg_t) first,
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    aid_t req = async_send_3(phone, VFS_LOOKUP, (ipcarg_t) first,
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        (ipcarg_t) last, (ipcarg_t) rootfs->dev_handle, &answer);
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        (ipcarg_t) last, (ipcarg_t) root->dev_handle, &answer);
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    vfs_release_phone(phone);
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    vfs_release_phone(phone);
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    ipcarg_t rc;
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    ipcarg_t rc;
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    async_wait_for(req, &rc);
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    async_wait_for(req, &rc);
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    futex_down(&plb_futex);
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    futex_down(&plb_futex);
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    list_remove(&entry.plb_link);
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    list_remove(&entry.plb_link);
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    /*
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     * Erasing the path from PLB will come handy for debugging purposes.
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     */
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    memset(&plb[first], 0, cnt1);
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    memset(plb, 0, cnt2);
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    futex_up(&plb_futex);
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    futex_up(&plb_futex);
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    if (rc == EOK) {
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    if (rc == EOK) {
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        result->fs_handle = (int) IPC_GET_ARG1(answer);
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        result->fs_handle = (int) IPC_GET_ARG1(answer);
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        result->dev_handle = (int) IPC_GET_ARG2(answer);
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        result->dev_handle = (int) IPC_GET_ARG2(answer);