/* * Copyright (c) 2009 Jakub Jermar * All rights reserved. * * Redistribution and use in source and binary forms, with or without * modification, are permitted provided that the following conditions * are met: * * - Redistributions of source code must retain the above copyright * notice, this list of conditions and the following disclaimer. * - Redistributions in binary form must reproduce the above copyright * notice, this list of conditions and the following disclaimer in the * documentation and/or other materials provided with the distribution. * - The name of the author may not be used to endorse or promote products * derived from this software without specific prior written permission. * * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. */ /** @addtogroup libfs * @{ */ /** * @file * Glue code which is common to all FS implementations. */ #include "libfs.h" #include "../../srv/vfs/vfs.h" #include #include #include #include #include #include #include #include #include #define on_error(rc, action) \ do { \ if ((rc) != EOK) \ action; \ } while (0) #define combine_rc(rc1, rc2) \ ((rc1) == EOK ? (rc2) : (rc1)) #define answer_and_return(rid, rc) \ do { \ async_answer_0((rid), (rc)); \ return; \ } while (0) static fs_reg_t reg; static vfs_out_ops_t *vfs_out_ops = NULL; static libfs_ops_t *libfs_ops = NULL; static void libfs_mount(libfs_ops_t *, fs_handle_t, ipc_callid_t, ipc_call_t *); static void libfs_unmount(libfs_ops_t *, ipc_callid_t, ipc_call_t *); static void libfs_lookup(libfs_ops_t *, fs_handle_t, ipc_callid_t, ipc_call_t *); static void libfs_stat(libfs_ops_t *, fs_handle_t, ipc_callid_t, ipc_call_t *); static void libfs_open_node(libfs_ops_t *, fs_handle_t, ipc_callid_t, ipc_call_t *); static void vfs_out_mounted(ipc_callid_t rid, ipc_call_t *req) { service_id_t service_id = (service_id_t) IPC_GET_ARG1(*req); char *opts; int rc; /* Accept the mount options. */ rc = async_data_write_accept((void **) &opts, true, 0, 0, 0, NULL); if (rc != EOK) { async_answer_0(rid, rc); return; } fs_index_t index; aoff64_t size; unsigned lnkcnt; rc = vfs_out_ops->mounted(service_id, opts, &index, &size, &lnkcnt); if (rc == EOK) async_answer_4(rid, EOK, index, LOWER32(size), UPPER32(size), lnkcnt); else async_answer_0(rid, rc); free(opts); } static void vfs_out_mount(ipc_callid_t rid, ipc_call_t *req) { libfs_mount(libfs_ops, reg.fs_handle, rid, req); } static void vfs_out_unmounted(ipc_callid_t rid, ipc_call_t *req) { service_id_t service_id = (service_id_t) IPC_GET_ARG1(*req); int rc; rc = vfs_out_ops->unmounted(service_id); async_answer_0(rid, rc); } static void vfs_out_unmount(ipc_callid_t rid, ipc_call_t *req) { libfs_unmount(libfs_ops, rid, req); } static void vfs_out_lookup(ipc_callid_t rid, ipc_call_t *req) { libfs_lookup(libfs_ops, reg.fs_handle, rid, req); } static void vfs_out_read(ipc_callid_t rid, ipc_call_t *req) { service_id_t service_id = (service_id_t) IPC_GET_ARG1(*req); fs_index_t index = (fs_index_t) IPC_GET_ARG2(*req); aoff64_t pos = (aoff64_t) MERGE_LOUP32(IPC_GET_ARG3(*req), IPC_GET_ARG4(*req)); size_t rbytes; int rc; rc = vfs_out_ops->read(service_id, index, pos, &rbytes); if (rc == EOK) async_answer_1(rid, EOK, rbytes); else async_answer_0(rid, rc); } static void vfs_out_write(ipc_callid_t rid, ipc_call_t *req) { service_id_t service_id = (service_id_t) IPC_GET_ARG1(*req); fs_index_t index = (fs_index_t) IPC_GET_ARG2(*req); aoff64_t pos = (aoff64_t) MERGE_LOUP32(IPC_GET_ARG3(*req), IPC_GET_ARG4(*req)); size_t wbytes; aoff64_t nsize; int rc; rc = vfs_out_ops->write(service_id, index, pos, &wbytes, &nsize); if (rc == EOK) async_answer_3(rid, EOK, wbytes, LOWER32(nsize), UPPER32(nsize)); else async_answer_0(rid, rc); } static void vfs_out_truncate(ipc_callid_t rid, ipc_call_t *req) { service_id_t service_id = (service_id_t) IPC_GET_ARG1(*req); fs_index_t index = (fs_index_t) IPC_GET_ARG2(*req); aoff64_t size = (aoff64_t) MERGE_LOUP32(IPC_GET_ARG3(*req), IPC_GET_ARG4(*req)); int rc; rc = vfs_out_ops->truncate(service_id, index, size); async_answer_0(rid, rc); } static void vfs_out_close(ipc_callid_t rid, ipc_call_t *req) { service_id_t service_id = (service_id_t) IPC_GET_ARG1(*req); fs_index_t index = (fs_index_t) IPC_GET_ARG2(*req); int rc; rc = vfs_out_ops->close(service_id, index); async_answer_0(rid, rc); } static void vfs_out_destroy(ipc_callid_t rid, ipc_call_t *req) { service_id_t service_id = (service_id_t) IPC_GET_ARG1(*req); fs_index_t index = (fs_index_t) IPC_GET_ARG2(*req); int rc; rc = vfs_out_ops->destroy(service_id, index); async_answer_0(rid, rc); } static void vfs_out_open_node(ipc_callid_t rid, ipc_call_t *req) { libfs_open_node(libfs_ops, reg.fs_handle, rid, req); } static void vfs_out_stat(ipc_callid_t rid, ipc_call_t *req) { libfs_stat(libfs_ops, reg.fs_handle, rid, req); } static void vfs_out_sync(ipc_callid_t rid, ipc_call_t *req) { service_id_t service_id = (service_id_t) IPC_GET_ARG1(*req); fs_index_t index = (fs_index_t) IPC_GET_ARG2(*req); int rc; rc = vfs_out_ops->sync(service_id, index); async_answer_0(rid, rc); } static void vfs_connection(ipc_callid_t iid, ipc_call_t *icall, void *arg) { if (iid) { /* * This only happens for connections opened by * IPC_M_CONNECT_ME_TO calls as opposed to callback connections * created by IPC_M_CONNECT_TO_ME. */ async_answer_0(iid, EOK); } while (true) { ipc_call_t call; ipc_callid_t callid = async_get_call(&call); if (!IPC_GET_IMETHOD(call)) return; switch (IPC_GET_IMETHOD(call)) { case VFS_OUT_MOUNTED: vfs_out_mounted(callid, &call); break; case VFS_OUT_MOUNT: vfs_out_mount(callid, &call); break; case VFS_OUT_UNMOUNTED: vfs_out_unmounted(callid, &call); break; case VFS_OUT_UNMOUNT: vfs_out_unmount(callid, &call); break; case VFS_OUT_LOOKUP: vfs_out_lookup(callid, &call); break; case VFS_OUT_READ: vfs_out_read(callid, &call); break; case VFS_OUT_WRITE: vfs_out_write(callid, &call); break; case VFS_OUT_TRUNCATE: vfs_out_truncate(callid, &call); break; case VFS_OUT_CLOSE: vfs_out_close(callid, &call); break; case VFS_OUT_DESTROY: vfs_out_destroy(callid, &call); break; case VFS_OUT_OPEN_NODE: vfs_out_open_node(callid, &call); break; case VFS_OUT_STAT: vfs_out_stat(callid, &call); break; case VFS_OUT_SYNC: vfs_out_sync(callid, &call); break; default: async_answer_0(callid, ENOTSUP); break; } } } /** Register file system server. * * This function abstracts away the tedious registration protocol from * file system implementations and lets them to reuse this registration glue * code. * * @param sess Session for communication with VFS. * @param info VFS info structure supplied by the file system * implementation. * @param vops Address of the vfs_out_ops_t structure. * @param lops Address of the libfs_ops_t structure. * * @return EOK on success or a non-zero error code on errror. * */ int fs_register(async_sess_t *sess, vfs_info_t *info, vfs_out_ops_t *vops, libfs_ops_t *lops) { /* * Tell VFS that we are here and want to get registered. * We use the async framework because VFS will answer the request * out-of-order, when it knows that the operation succeeded or failed. */ async_exch_t *exch = async_exchange_begin(sess); ipc_call_t answer; aid_t req = async_send_0(exch, VFS_IN_REGISTER, &answer); /* * Send our VFS info structure to VFS. */ int rc = async_data_write_start(exch, info, sizeof(*info)); if (rc != EOK) { async_exchange_end(exch); async_wait_for(req, NULL); return rc; } /* * Set VFS_OUT and libfs operations. */ vfs_out_ops = vops; libfs_ops = lops; /* * Ask VFS for callback connection. */ async_connect_to_me(exch, 0, 0, 0, vfs_connection, NULL); /* * Request sharing the Path Lookup Buffer with VFS. */ rc = async_share_in_start_0_0(exch, PLB_SIZE, (void *) ®.plb_ro); if (reg.plb_ro == (void *) -1) { async_exchange_end(exch); async_wait_for(req, NULL); return ENOMEM; } async_exchange_end(exch); if (rc) { async_wait_for(req, NULL); return rc; } /* * Pick up the answer for the request to the VFS_IN_REQUEST call. */ async_wait_for(req, NULL); reg.fs_handle = (int) IPC_GET_ARG1(answer); /* * Tell the async framework that other connections are to be handled by * the same connection fibril as well. */ async_set_client_connection(vfs_connection); return IPC_GET_RETVAL(answer); } void fs_node_initialize(fs_node_t *fn) { memset(fn, 0, sizeof(fs_node_t)); } void libfs_mount(libfs_ops_t *ops, fs_handle_t fs_handle, ipc_callid_t rid, ipc_call_t *req) { service_id_t mp_service_id = (service_id_t) IPC_GET_ARG1(*req); fs_index_t mp_fs_index = (fs_index_t) IPC_GET_ARG2(*req); fs_handle_t mr_fs_handle = (fs_handle_t) IPC_GET_ARG3(*req); service_id_t mr_service_id = (service_id_t) IPC_GET_ARG4(*req); async_sess_t *mountee_sess = async_clone_receive(EXCHANGE_PARALLEL); if (mountee_sess == NULL) { async_answer_0(rid, EINVAL); return; } fs_node_t *fn; int res = ops->node_get(&fn, mp_service_id, mp_fs_index); if ((res != EOK) || (!fn)) { async_hangup(mountee_sess); async_data_write_void(combine_rc(res, ENOENT)); async_answer_0(rid, combine_rc(res, ENOENT)); return; } if (fn->mp_data.mp_active) { async_hangup(mountee_sess); (void) ops->node_put(fn); async_data_write_void(EBUSY); async_answer_0(rid, EBUSY); return; } async_exch_t *exch = async_exchange_begin(mountee_sess); async_sess_t *sess = async_connect_me(EXCHANGE_PARALLEL, exch); if (!sess) { async_exchange_end(exch); async_hangup(mountee_sess); (void) ops->node_put(fn); async_data_write_void(errno); async_answer_0(rid, errno); return; } ipc_call_t answer; int rc = async_data_write_forward_1_1(exch, VFS_OUT_MOUNTED, mr_service_id, &answer); async_exchange_end(exch); if (rc == EOK) { fn->mp_data.mp_active = true; fn->mp_data.fs_handle = mr_fs_handle; fn->mp_data.service_id = mr_service_id; fn->mp_data.sess = mountee_sess; } /* * Do not release the FS node so that it stays in memory. */ async_answer_4(rid, rc, IPC_GET_ARG1(answer), IPC_GET_ARG2(answer), IPC_GET_ARG3(answer), IPC_GET_ARG4(answer)); } void libfs_unmount(libfs_ops_t *ops, ipc_callid_t rid, ipc_call_t *req) { service_id_t mp_service_id = (service_id_t) IPC_GET_ARG1(*req); fs_index_t mp_fs_index = (fs_index_t) IPC_GET_ARG2(*req); fs_node_t *fn; int res; res = ops->node_get(&fn, mp_service_id, mp_fs_index); if ((res != EOK) || (!fn)) { async_answer_0(rid, combine_rc(res, ENOENT)); return; } /* * We are clearly expecting to find the mount point active. */ if (!fn->mp_data.mp_active) { (void) ops->node_put(fn); async_answer_0(rid, EINVAL); return; } /* * Tell the mounted file system to unmount. */ async_exch_t *exch = async_exchange_begin(fn->mp_data.sess); res = async_req_1_0(exch, VFS_OUT_UNMOUNTED, fn->mp_data.service_id); async_exchange_end(exch); /* * If everything went well, perform the clean-up on our side. */ if (res == EOK) { async_hangup(fn->mp_data.sess); fn->mp_data.mp_active = false; fn->mp_data.fs_handle = 0; fn->mp_data.service_id = 0; fn->mp_data.sess = NULL; /* Drop the reference created in libfs_mount(). */ (void) ops->node_put(fn); } (void) ops->node_put(fn); async_answer_0(rid, res); } static char plb_get_char(unsigned pos) { return reg.plb_ro[pos % PLB_SIZE]; } /** Lookup VFS triplet by name in the file system name space. * * The path passed in the PLB must be in the canonical file system path format * as returned by the canonify() function. * * @param ops libfs operations structure with function pointers to * file system implementation * @param fs_handle File system handle of the file system where to perform * the lookup. * @param rid Request ID of the VFS_OUT_LOOKUP request. * @param request VFS_OUT_LOOKUP request data itself. * */ void libfs_lookup(libfs_ops_t *ops, fs_handle_t fs_handle, ipc_callid_t rid, ipc_call_t *req) { unsigned int first = IPC_GET_ARG1(*req); unsigned int last = IPC_GET_ARG2(*req); unsigned int next = first; service_id_t service_id = IPC_GET_ARG3(*req); int lflag = IPC_GET_ARG4(*req); fs_index_t index = IPC_GET_ARG5(*req); char component[NAME_MAX + 1]; int len; int rc; if (last < next) last += PLB_SIZE; fs_node_t *par = NULL; fs_node_t *cur = NULL; fs_node_t *tmp = NULL; rc = ops->root_get(&cur, service_id); on_error(rc, goto out_with_answer); if (cur->mp_data.mp_active) { async_exch_t *exch = async_exchange_begin(cur->mp_data.sess); async_forward_slow(rid, exch, VFS_OUT_LOOKUP, next, last, cur->mp_data.service_id, lflag, index, IPC_FF_ROUTE_FROM_ME); async_exchange_end(exch); (void) ops->node_put(cur); return; } /* Eat slash */ if (plb_get_char(next) == '/') next++; while (next <= last) { bool has_children; rc = ops->has_children(&has_children, cur); on_error(rc, goto out_with_answer); if (!has_children) break; /* Collect the component */ len = 0; while ((next <= last) && (plb_get_char(next) != '/')) { if (len + 1 == NAME_MAX) { /* Component length overflow */ async_answer_0(rid, ENAMETOOLONG); goto out; } component[len++] = plb_get_char(next); /* Process next character */ next++; } assert(len); component[len] = '\0'; /* Eat slash */ next++; /* Match the component */ rc = ops->match(&tmp, cur, component); on_error(rc, goto out_with_answer); /* * If the matching component is a mount point, there are two * legitimate semantics of the lookup operation. The first is * the commonly used one in which the lookup crosses each mount * point into the mounted file system. The second semantics is * used mostly during unmount() and differs from the first one * only in that the last mount point in the looked up path, * which is also its last component, is not crossed. */ if ((tmp) && (tmp->mp_data.mp_active) && (!(lflag & L_MP) || (next <= last))) { if (next > last) next = last = first; else next--; async_exch_t *exch = async_exchange_begin(tmp->mp_data.sess); async_forward_slow(rid, exch, VFS_OUT_LOOKUP, next, last, tmp->mp_data.service_id, lflag, index, IPC_FF_ROUTE_FROM_ME); async_exchange_end(exch); (void) ops->node_put(cur); (void) ops->node_put(tmp); if (par) (void) ops->node_put(par); return; } /* Handle miss: match amongst siblings */ if (!tmp) { if (next <= last) { /* There are unprocessed components */ async_answer_0(rid, ENOENT); goto out; } /* Miss in the last component */ if (lflag & (L_CREATE | L_LINK)) { /* Request to create a new link */ if (!ops->is_directory(cur)) { async_answer_0(rid, ENOTDIR); goto out; } fs_node_t *fn; if (lflag & L_CREATE) rc = ops->create(&fn, service_id, lflag); else rc = ops->node_get(&fn, service_id, index); on_error(rc, goto out_with_answer); if (fn) { rc = ops->link(cur, fn, component); if (rc != EOK) { if (lflag & L_CREATE) (void) ops->destroy(fn); else (void) ops->node_put(fn); async_answer_0(rid, rc); } else { aoff64_t size = ops->size_get(fn); async_answer_5(rid, fs_handle, service_id, ops->index_get(fn), LOWER32(size), UPPER32(size), ops->lnkcnt_get(fn)); (void) ops->node_put(fn); } } else async_answer_0(rid, ENOSPC); goto out; } async_answer_0(rid, ENOENT); goto out; } if (par) { rc = ops->node_put(par); on_error(rc, goto out_with_answer); } /* Descend one level */ par = cur; cur = tmp; tmp = NULL; } /* Handle miss: excessive components */ if (next <= last) { bool has_children; rc = ops->has_children(&has_children, cur); on_error(rc, goto out_with_answer); if (has_children) goto skip_miss; if (lflag & (L_CREATE | L_LINK)) { if (!ops->is_directory(cur)) { async_answer_0(rid, ENOTDIR); goto out; } /* Collect next component */ len = 0; while (next <= last) { if (plb_get_char(next) == '/') { /* More than one component */ async_answer_0(rid, ENOENT); goto out; } if (len + 1 == NAME_MAX) { /* Component length overflow */ async_answer_0(rid, ENAMETOOLONG); goto out; } component[len++] = plb_get_char(next); /* Process next character */ next++; } assert(len); component[len] = '\0'; fs_node_t *fn; if (lflag & L_CREATE) rc = ops->create(&fn, service_id, lflag); else rc = ops->node_get(&fn, service_id, index); on_error(rc, goto out_with_answer); if (fn) { rc = ops->link(cur, fn, component); if (rc != EOK) { if (lflag & L_CREATE) (void) ops->destroy(fn); else (void) ops->node_put(fn); async_answer_0(rid, rc); } else { aoff64_t size = ops->size_get(fn); async_answer_5(rid, fs_handle, service_id, ops->index_get(fn), LOWER32(size), UPPER32(size), ops->lnkcnt_get(fn)); (void) ops->node_put(fn); } } else async_answer_0(rid, ENOSPC); goto out; } async_answer_0(rid, ENOENT); goto out; } skip_miss: /* Handle hit */ if (lflag & L_UNLINK) { unsigned int old_lnkcnt = ops->lnkcnt_get(cur); rc = ops->unlink(par, cur, component); if (rc == EOK) { aoff64_t size = ops->size_get(cur); async_answer_5(rid, fs_handle, service_id, ops->index_get(cur), LOWER32(size), UPPER32(size), old_lnkcnt); } else async_answer_0(rid, rc); goto out; } if (((lflag & (L_CREATE | L_EXCLUSIVE)) == (L_CREATE | L_EXCLUSIVE)) || (lflag & L_LINK)) { async_answer_0(rid, EEXIST); goto out; } if ((lflag & L_FILE) && (ops->is_directory(cur))) { async_answer_0(rid, EISDIR); goto out; } if ((lflag & L_DIRECTORY) && (ops->is_file(cur))) { async_answer_0(rid, ENOTDIR); goto out; } if ((lflag & L_ROOT) && par) { async_answer_0(rid, EINVAL); goto out; } out_with_answer: if (rc == EOK) { if (lflag & L_OPEN) rc = ops->node_open(cur); if (rc == EOK) { aoff64_t size = ops->size_get(cur); async_answer_5(rid, fs_handle, service_id, ops->index_get(cur), LOWER32(size), UPPER32(size), ops->lnkcnt_get(cur)); } else async_answer_0(rid, rc); } else async_answer_0(rid, rc); out: if (par) (void) ops->node_put(par); if (cur) (void) ops->node_put(cur); if (tmp) (void) ops->node_put(tmp); } void libfs_stat(libfs_ops_t *ops, fs_handle_t fs_handle, ipc_callid_t rid, ipc_call_t *request) { service_id_t service_id = (service_id_t) IPC_GET_ARG1(*request); fs_index_t index = (fs_index_t) IPC_GET_ARG2(*request); fs_node_t *fn; int rc = ops->node_get(&fn, service_id, index); on_error(rc, answer_and_return(rid, rc)); ipc_callid_t callid; size_t size; if ((!async_data_read_receive(&callid, &size)) || (size != sizeof(struct stat))) { ops->node_put(fn); async_answer_0(callid, EINVAL); async_answer_0(rid, EINVAL); return; } struct stat stat; memset(&stat, 0, sizeof(struct stat)); stat.fs_handle = fs_handle; stat.service_id = service_id; stat.index = index; stat.lnkcnt = ops->lnkcnt_get(fn); stat.is_file = ops->is_file(fn); stat.is_directory = ops->is_directory(fn); stat.size = ops->size_get(fn); stat.service = ops->service_get(fn); ops->node_put(fn); async_data_read_finalize(callid, &stat, sizeof(struct stat)); async_answer_0(rid, EOK); } /** Open VFS triplet. * * @param ops libfs operations structure with function pointers to * file system implementation * @param rid Request ID of the VFS_OUT_OPEN_NODE request. * @param request VFS_OUT_OPEN_NODE request data itself. * */ void libfs_open_node(libfs_ops_t *ops, fs_handle_t fs_handle, ipc_callid_t rid, ipc_call_t *request) { service_id_t service_id = IPC_GET_ARG1(*request); fs_index_t index = IPC_GET_ARG2(*request); fs_node_t *fn; int rc = ops->node_get(&fn, service_id, index); on_error(rc, answer_and_return(rid, rc)); if (fn == NULL) { async_answer_0(rid, ENOENT); return; } rc = ops->node_open(fn); aoff64_t size = ops->size_get(fn); async_answer_4(rid, rc, LOWER32(size), UPPER32(size), ops->lnkcnt_get(fn), (ops->is_file(fn) ? L_FILE : 0) | (ops->is_directory(fn) ? L_DIRECTORY : 0)); (void) ops->node_put(fn); } static FIBRIL_MUTEX_INITIALIZE(instances_mutex); static LIST_INITIALIZE(instances_list); typedef struct { service_id_t service_id; link_t link; void *data; } fs_instance_t; int fs_instance_create(service_id_t service_id, void *data) { fs_instance_t *inst = malloc(sizeof(fs_instance_t)); if (!inst) return ENOMEM; link_initialize(&inst->link); inst->service_id = service_id; inst->data = data; fibril_mutex_lock(&instances_mutex); list_foreach(instances_list, link) { fs_instance_t *cur = list_get_instance(link, fs_instance_t, link); if (cur->service_id == service_id) { fibril_mutex_unlock(&instances_mutex); free(inst); return EEXIST; } /* keep the list sorted */ if (cur->service_id < service_id) { list_insert_before(&inst->link, &cur->link); fibril_mutex_unlock(&instances_mutex); return EOK; } } list_append(&inst->link, &instances_list); fibril_mutex_unlock(&instances_mutex); return EOK; } int fs_instance_get(service_id_t service_id, void **idp) { fibril_mutex_lock(&instances_mutex); list_foreach(instances_list, link) { fs_instance_t *inst = list_get_instance(link, fs_instance_t, link); if (inst->service_id == service_id) { *idp = inst->data; fibril_mutex_unlock(&instances_mutex); return EOK; } } fibril_mutex_unlock(&instances_mutex); return ENOENT; } int fs_instance_destroy(service_id_t service_id) { fibril_mutex_lock(&instances_mutex); list_foreach(instances_list, link) { fs_instance_t *inst = list_get_instance(link, fs_instance_t, link); if (inst->service_id == service_id) { list_remove(&inst->link); fibril_mutex_unlock(&instances_mutex); free(inst); return EOK; } } fibril_mutex_unlock(&instances_mutex); return ENOENT; } /** @} */