| /* |
| * Copyright (C) 2010 The Android Open Source Project |
| * |
| * Licensed under the Apache License, Version 2.0 (the "License"); |
| * you may not use this file except in compliance with the License. |
| * You may obtain a copy of the License at |
| * |
| * http://www.apache.org/licenses/LICENSE-2.0 |
| * |
| * Unless required by applicable law or agreed to in writing, software |
| * distributed under the License is distributed on an "AS IS" BASIS, |
| * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. |
| * See the License for the specific language governing permissions and |
| * limitations under the License. |
| */ |
| |
| #define LOG_TAG "sdcard" |
| |
| #include "fuse.h" |
| |
| #include <android-base/logging.h> |
| |
| /* FUSE_CANONICAL_PATH is not currently upstreamed */ |
| #define FUSE_CANONICAL_PATH 2016 |
| |
| #define PROP_SDCARDFS_DEVICE "ro.sys.sdcardfs" |
| #define PROP_SDCARDFS_USER "persist.sys.sdcardfs" |
| |
| #define FUSE_UNKNOWN_INO 0xffffffff |
| |
| /* Pseudo-error constant used to indicate that no fuse status is needed |
| * or that a reply has already been written. */ |
| #define NO_STATUS 1 |
| |
| static inline void *id_to_ptr(__u64 nid) |
| { |
| return (void *) (uintptr_t) nid; |
| } |
| |
| static inline __u64 ptr_to_id(void *ptr) |
| { |
| return (__u64) (uintptr_t) ptr; |
| } |
| |
| static void acquire_node_locked(struct node* node) |
| { |
| node->refcount++; |
| DLOG(INFO) << "ACQUIRE " << std::hex << node << std::dec |
| << " (" << node->name << ") rc=" << node->refcount; |
| } |
| |
| static void remove_node_from_parent_locked(struct node* node); |
| |
| static void release_node_locked(struct node* node) |
| { |
| DLOG(INFO) << "RELEASE " << std::hex << node << std::dec |
| << " (" << node->name << ") rc=" << node->refcount; |
| if (node->refcount > 0) { |
| node->refcount--; |
| if (!node->refcount) { |
| DLOG(INFO) << "DESTROY " << std::hex << node << std::dec << " (" << node->name << ")"; |
| remove_node_from_parent_locked(node); |
| |
| /* TODO: remove debugging - poison memory */ |
| memset(node->name, 0xef, node->namelen); |
| free(node->name); |
| free(node->actual_name); |
| memset(node, 0xfc, sizeof(*node)); |
| free(node); |
| } |
| } else { |
| LOG(ERROR) << std::hex << node << std::dec << " refcount=0"; |
| } |
| } |
| |
| static void add_node_to_parent_locked(struct node *node, struct node *parent) { |
| node->parent = parent; |
| node->next = parent->child; |
| parent->child = node; |
| acquire_node_locked(parent); |
| } |
| |
| static void remove_node_from_parent_locked(struct node* node) |
| { |
| if (node->parent) { |
| if (node->parent->child == node) { |
| node->parent->child = node->parent->child->next; |
| } else { |
| struct node *node2; |
| node2 = node->parent->child; |
| while (node2->next != node) |
| node2 = node2->next; |
| node2->next = node->next; |
| } |
| release_node_locked(node->parent); |
| node->parent = NULL; |
| node->next = NULL; |
| } |
| } |
| |
| /* Gets the absolute path to a node into the provided buffer. |
| * |
| * Populates 'buf' with the path and returns the length of the path on success, |
| * or returns -1 if the path is too long for the provided buffer. |
| */ |
| static ssize_t get_node_path_locked(struct node* node, char* buf, size_t bufsize) { |
| const char* name; |
| size_t namelen; |
| if (node->graft_path) { |
| name = node->graft_path; |
| namelen = node->graft_pathlen; |
| } else if (node->actual_name) { |
| name = node->actual_name; |
| namelen = node->namelen; |
| } else { |
| name = node->name; |
| namelen = node->namelen; |
| } |
| |
| if (bufsize < namelen + 1) { |
| return -1; |
| } |
| |
| ssize_t pathlen = 0; |
| if (node->parent && node->graft_path == NULL) { |
| pathlen = get_node_path_locked(node->parent, buf, bufsize - namelen - 1); |
| if (pathlen < 0) { |
| return -1; |
| } |
| buf[pathlen++] = '/'; |
| } |
| |
| memcpy(buf + pathlen, name, namelen + 1); /* include trailing \0 */ |
| return pathlen + namelen; |
| } |
| |
| /* Finds the absolute path of a file within a given directory. |
| * Performs a case-insensitive search for the file and sets the buffer to the path |
| * of the first matching file. If 'search' is zero or if no match is found, sets |
| * the buffer to the path that the file would have, assuming the name were case-sensitive. |
| * |
| * Populates 'buf' with the path and returns the actual name (within 'buf') on success, |
| * or returns NULL if the path is too long for the provided buffer. |
| */ |
| static char* find_file_within(const char* path, const char* name, |
| char* buf, size_t bufsize, int search) |
| { |
| size_t pathlen = strlen(path); |
| size_t namelen = strlen(name); |
| size_t childlen = pathlen + namelen + 1; |
| char* actual; |
| |
| if (bufsize <= childlen) { |
| return NULL; |
| } |
| |
| memcpy(buf, path, pathlen); |
| buf[pathlen] = '/'; |
| actual = buf + pathlen + 1; |
| memcpy(actual, name, namelen + 1); |
| |
| if (search && access(buf, F_OK)) { |
| struct dirent* entry; |
| DIR* dir = opendir(path); |
| if (!dir) { |
| PLOG(ERROR) << "opendir(" << path << ") failed"; |
| return actual; |
| } |
| while ((entry = readdir(dir))) { |
| if (!strcasecmp(entry->d_name, name)) { |
| /* we have a match - replace the name, don't need to copy the null again */ |
| memcpy(actual, entry->d_name, namelen); |
| break; |
| } |
| } |
| closedir(dir); |
| } |
| return actual; |
| } |
| |
| static void attr_from_stat(struct fuse* fuse, struct fuse_attr *attr, |
| const struct stat *s, const struct node* node) { |
| attr->ino = node->ino; |
| attr->size = s->st_size; |
| attr->blocks = s->st_blocks; |
| attr->atime = s->st_atim.tv_sec; |
| attr->mtime = s->st_mtim.tv_sec; |
| attr->ctime = s->st_ctim.tv_sec; |
| attr->atimensec = s->st_atim.tv_nsec; |
| attr->mtimensec = s->st_mtim.tv_nsec; |
| attr->ctimensec = s->st_ctim.tv_nsec; |
| attr->mode = s->st_mode; |
| attr->nlink = s->st_nlink; |
| |
| attr->uid = node->uid; |
| |
| if (fuse->gid == AID_SDCARD_RW) { |
| /* As an optimization, certain trusted system components only run |
| * as owner but operate across all users. Since we're now handing |
| * out the sdcard_rw GID only to trusted apps, we're okay relaxing |
| * the user boundary enforcement for the default view. The UIDs |
| * assigned to app directories are still multiuser aware. */ |
| attr->gid = AID_SDCARD_RW; |
| } else { |
| attr->gid = multiuser_get_uid(node->userid, fuse->gid); |
| } |
| |
| int visible_mode = 0775 & ~fuse->mask; |
| if (node->perm == PERM_PRE_ROOT) { |
| /* Top of multi-user view should always be visible to ensure |
| * secondary users can traverse inside. */ |
| visible_mode = 0711; |
| } else if (node->under_android) { |
| /* Block "other" access to Android directories, since only apps |
| * belonging to a specific user should be in there; we still |
| * leave +x open for the default view. */ |
| if (fuse->gid == AID_SDCARD_RW) { |
| visible_mode = visible_mode & ~0006; |
| } else { |
| visible_mode = visible_mode & ~0007; |
| } |
| } |
| int owner_mode = s->st_mode & 0700; |
| int filtered_mode = visible_mode & (owner_mode | (owner_mode >> 3) | (owner_mode >> 6)); |
| attr->mode = (attr->mode & S_IFMT) | filtered_mode; |
| } |
| |
| static int touch(char* path, mode_t mode) { |
| int fd = open(path, O_RDWR | O_CREAT | O_EXCL | O_NOFOLLOW, mode); |
| if (fd == -1) { |
| if (errno == EEXIST) { |
| return 0; |
| } else { |
| PLOG(ERROR) << "open(" << path << ") failed"; |
| return -1; |
| } |
| } |
| close(fd); |
| return 0; |
| } |
| |
| static void derive_permissions_locked(struct fuse* fuse, struct node *parent, |
| struct node *node) { |
| appid_t appid; |
| |
| /* By default, each node inherits from its parent */ |
| node->perm = PERM_INHERIT; |
| node->userid = parent->userid; |
| node->uid = parent->uid; |
| node->under_android = parent->under_android; |
| |
| /* Derive custom permissions based on parent and current node */ |
| switch (parent->perm) { |
| case PERM_INHERIT: |
| /* Already inherited above */ |
| break; |
| case PERM_PRE_ROOT: |
| /* Legacy internal layout places users at top level */ |
| node->perm = PERM_ROOT; |
| node->userid = strtoul(node->name, NULL, 10); |
| break; |
| case PERM_ROOT: |
| /* Assume masked off by default. */ |
| if (!strcasecmp(node->name, "Android")) { |
| /* App-specific directories inside; let anyone traverse */ |
| node->perm = PERM_ANDROID; |
| node->under_android = true; |
| } |
| break; |
| case PERM_ANDROID: |
| if (!strcasecmp(node->name, "data")) { |
| /* App-specific directories inside; let anyone traverse */ |
| node->perm = PERM_ANDROID_DATA; |
| } else if (!strcasecmp(node->name, "obb")) { |
| /* App-specific directories inside; let anyone traverse */ |
| node->perm = PERM_ANDROID_OBB; |
| /* Single OBB directory is always shared */ |
| node->graft_path = fuse->global->obb_path; |
| node->graft_pathlen = strlen(fuse->global->obb_path); |
| } else if (!strcasecmp(node->name, "media")) { |
| /* App-specific directories inside; let anyone traverse */ |
| node->perm = PERM_ANDROID_MEDIA; |
| } |
| break; |
| case PERM_ANDROID_DATA: |
| case PERM_ANDROID_OBB: |
| case PERM_ANDROID_MEDIA: |
| const auto& iter = fuse->global->package_to_appid->find(node->name); |
| if (iter != fuse->global->package_to_appid->end()) { |
| appid = iter->second; |
| node->uid = multiuser_get_uid(parent->userid, appid); |
| } |
| break; |
| } |
| } |
| |
| void derive_permissions_recursive_locked(struct fuse* fuse, struct node *parent) { |
| struct node *node; |
| for (node = parent->child; node; node = node->next) { |
| derive_permissions_locked(fuse, parent, node); |
| if (node->child) { |
| derive_permissions_recursive_locked(fuse, node); |
| } |
| } |
| } |
| |
| /* Kernel has already enforced everything we returned through |
| * derive_permissions_locked(), so this is used to lock down access |
| * even further, such as enforcing that apps hold sdcard_rw. */ |
| static bool check_caller_access_to_name(struct fuse* fuse, |
| const struct fuse_in_header *hdr, const struct node* parent_node, |
| const char* name, int mode) { |
| /* Always block security-sensitive files at root */ |
| if (parent_node && parent_node->perm == PERM_ROOT) { |
| if (!strcasecmp(name, "autorun.inf") |
| || !strcasecmp(name, ".android_secure") |
| || !strcasecmp(name, "android_secure")) { |
| return false; |
| } |
| } |
| |
| /* Root always has access; access for any other UIDs should always |
| * be controlled through packages.list. */ |
| if (hdr->uid == 0) { |
| return true; |
| } |
| |
| /* No extra permissions to enforce */ |
| return true; |
| } |
| |
| static bool check_caller_access_to_node(struct fuse* fuse, |
| const struct fuse_in_header *hdr, const struct node* node, int mode) { |
| return check_caller_access_to_name(fuse, hdr, node->parent, node->name, mode); |
| } |
| |
| struct node *create_node_locked(struct fuse* fuse, |
| struct node *parent, const char *name, const char* actual_name) |
| { |
| struct node *node; |
| size_t namelen = strlen(name); |
| |
| // Detect overflows in the inode counter. "4 billion nodes should be enough |
| // for everybody". |
| if (fuse->global->inode_ctr == 0) { |
| LOG(ERROR) << "No more inode numbers available"; |
| return NULL; |
| } |
| |
| node = static_cast<struct node*>(calloc(1, sizeof(struct node))); |
| if (!node) { |
| return NULL; |
| } |
| node->name = static_cast<char*>(malloc(namelen + 1)); |
| if (!node->name) { |
| free(node); |
| return NULL; |
| } |
| memcpy(node->name, name, namelen + 1); |
| if (strcmp(name, actual_name)) { |
| node->actual_name = static_cast<char*>(malloc(namelen + 1)); |
| if (!node->actual_name) { |
| free(node->name); |
| free(node); |
| return NULL; |
| } |
| memcpy(node->actual_name, actual_name, namelen + 1); |
| } |
| node->namelen = namelen; |
| node->nid = ptr_to_id(node); |
| node->ino = fuse->global->inode_ctr++; |
| node->gen = fuse->global->next_generation++; |
| |
| node->deleted = false; |
| |
| derive_permissions_locked(fuse, parent, node); |
| acquire_node_locked(node); |
| add_node_to_parent_locked(node, parent); |
| return node; |
| } |
| |
| static int rename_node_locked(struct node *node, const char *name, |
| const char* actual_name) |
| { |
| size_t namelen = strlen(name); |
| int need_actual_name = strcmp(name, actual_name); |
| |
| /* make the storage bigger without actually changing the name |
| * in case an error occurs part way */ |
| if (namelen > node->namelen) { |
| char* new_name = static_cast<char*>(realloc(node->name, namelen + 1)); |
| if (!new_name) { |
| return -ENOMEM; |
| } |
| node->name = new_name; |
| if (need_actual_name && node->actual_name) { |
| char* new_actual_name = static_cast<char*>(realloc(node->actual_name, namelen + 1)); |
| if (!new_actual_name) { |
| return -ENOMEM; |
| } |
| node->actual_name = new_actual_name; |
| } |
| } |
| |
| /* update the name, taking care to allocate storage before overwriting the old name */ |
| if (need_actual_name) { |
| if (!node->actual_name) { |
| node->actual_name = static_cast<char*>(malloc(namelen + 1)); |
| if (!node->actual_name) { |
| return -ENOMEM; |
| } |
| } |
| memcpy(node->actual_name, actual_name, namelen + 1); |
| } else { |
| free(node->actual_name); |
| node->actual_name = NULL; |
| } |
| memcpy(node->name, name, namelen + 1); |
| node->namelen = namelen; |
| return 0; |
| } |
| |
| static struct node *lookup_node_by_id_locked(struct fuse *fuse, __u64 nid) |
| { |
| if (nid == FUSE_ROOT_ID) { |
| return &fuse->global->root; |
| } else { |
| return static_cast<struct node*>(id_to_ptr(nid)); |
| } |
| } |
| |
| static struct node* lookup_node_and_path_by_id_locked(struct fuse* fuse, __u64 nid, |
| char* buf, size_t bufsize) |
| { |
| struct node* node = lookup_node_by_id_locked(fuse, nid); |
| if (node && get_node_path_locked(node, buf, bufsize) < 0) { |
| node = NULL; |
| } |
| return node; |
| } |
| |
| static struct node *lookup_child_by_name_locked(struct node *node, const char *name) |
| { |
| for (node = node->child; node; node = node->next) { |
| /* use exact string comparison, nodes that differ by case |
| * must be considered distinct even if they refer to the same |
| * underlying file as otherwise operations such as "mv x x" |
| * will not work because the source and target nodes are the same. */ |
| if (!strcmp(name, node->name) && !node->deleted) { |
| return node; |
| } |
| } |
| return 0; |
| } |
| |
| static struct node* acquire_or_create_child_locked( |
| struct fuse* fuse, struct node* parent, |
| const char* name, const char* actual_name) |
| { |
| struct node* child = lookup_child_by_name_locked(parent, name); |
| if (child) { |
| acquire_node_locked(child); |
| } else { |
| child = create_node_locked(fuse, parent, name, actual_name); |
| } |
| return child; |
| } |
| |
| static void fuse_status(struct fuse *fuse, __u64 unique, int err) |
| { |
| struct fuse_out_header hdr; |
| hdr.len = sizeof(hdr); |
| hdr.error = err; |
| hdr.unique = unique; |
| write(fuse->fd, &hdr, sizeof(hdr)); |
| } |
| |
| static void fuse_reply(struct fuse *fuse, __u64 unique, void *data, int len) |
| { |
| struct fuse_out_header hdr; |
| struct iovec vec[2]; |
| int res; |
| |
| hdr.len = len + sizeof(hdr); |
| hdr.error = 0; |
| hdr.unique = unique; |
| |
| vec[0].iov_base = &hdr; |
| vec[0].iov_len = sizeof(hdr); |
| vec[1].iov_base = data; |
| vec[1].iov_len = len; |
| |
| res = writev(fuse->fd, vec, 2); |
| if (res < 0) { |
| PLOG(ERROR) << "*** REPLY FAILED ***"; |
| } |
| } |
| |
| static int fuse_reply_entry(struct fuse* fuse, __u64 unique, |
| struct node* parent, const char* name, const char* actual_name, |
| const char* path) |
| { |
| struct node* node; |
| struct fuse_entry_out out; |
| struct stat s; |
| |
| if (lstat(path, &s) < 0) { |
| return -errno; |
| } |
| |
| pthread_mutex_lock(&fuse->global->lock); |
| node = acquire_or_create_child_locked(fuse, parent, name, actual_name); |
| if (!node) { |
| pthread_mutex_unlock(&fuse->global->lock); |
| return -ENOMEM; |
| } |
| memset(&out, 0, sizeof(out)); |
| attr_from_stat(fuse, &out.attr, &s, node); |
| out.attr_valid = 10; |
| out.entry_valid = 10; |
| out.nodeid = node->nid; |
| out.generation = node->gen; |
| pthread_mutex_unlock(&fuse->global->lock); |
| fuse_reply(fuse, unique, &out, sizeof(out)); |
| return NO_STATUS; |
| } |
| |
| static int fuse_reply_attr(struct fuse* fuse, __u64 unique, const struct node* node, |
| const char* path) |
| { |
| struct fuse_attr_out out; |
| struct stat s; |
| |
| if (lstat(path, &s) < 0) { |
| return -errno; |
| } |
| memset(&out, 0, sizeof(out)); |
| attr_from_stat(fuse, &out.attr, &s, node); |
| out.attr_valid = 10; |
| fuse_reply(fuse, unique, &out, sizeof(out)); |
| return NO_STATUS; |
| } |
| |
| static void fuse_notify_delete(struct fuse* fuse, const __u64 parent, |
| const __u64 child, const char* name) { |
| struct fuse_out_header hdr; |
| struct fuse_notify_delete_out data; |
| struct iovec vec[3]; |
| size_t namelen = strlen(name); |
| int res; |
| |
| hdr.len = sizeof(hdr) + sizeof(data) + namelen + 1; |
| hdr.error = FUSE_NOTIFY_DELETE; |
| hdr.unique = 0; |
| |
| data.parent = parent; |
| data.child = child; |
| data.namelen = namelen; |
| data.padding = 0; |
| |
| vec[0].iov_base = &hdr; |
| vec[0].iov_len = sizeof(hdr); |
| vec[1].iov_base = &data; |
| vec[1].iov_len = sizeof(data); |
| vec[2].iov_base = (void*) name; |
| vec[2].iov_len = namelen + 1; |
| |
| res = writev(fuse->fd, vec, 3); |
| /* Ignore ENOENT, since other views may not have seen the entry */ |
| if (res < 0 && errno != ENOENT) { |
| PLOG(ERROR) << "*** NOTIFY FAILED ***"; |
| } |
| } |
| |
| static int handle_lookup(struct fuse* fuse, struct fuse_handler* handler, |
| const struct fuse_in_header *hdr, const char* name) |
| { |
| struct node* parent_node; |
| char parent_path[PATH_MAX]; |
| char child_path[PATH_MAX]; |
| const char* actual_name; |
| |
| pthread_mutex_lock(&fuse->global->lock); |
| parent_node = lookup_node_and_path_by_id_locked(fuse, hdr->nodeid, |
| parent_path, sizeof(parent_path)); |
| DLOG(INFO) << "[" << handler->token << "] LOOKUP " << name << " @ " << hdr->nodeid |
| << " (" << (parent_node ? parent_node->name : "?") << ")"; |
| pthread_mutex_unlock(&fuse->global->lock); |
| |
| if (!parent_node || !(actual_name = find_file_within(parent_path, name, |
| child_path, sizeof(child_path), 1))) { |
| return -ENOENT; |
| } |
| if (!check_caller_access_to_name(fuse, hdr, parent_node, name, R_OK)) { |
| return -EACCES; |
| } |
| |
| return fuse_reply_entry(fuse, hdr->unique, parent_node, name, actual_name, child_path); |
| } |
| |
| static int handle_forget(struct fuse* fuse, struct fuse_handler* handler, |
| const struct fuse_in_header *hdr, const struct fuse_forget_in *req) |
| { |
| struct node* node; |
| |
| pthread_mutex_lock(&fuse->global->lock); |
| node = lookup_node_by_id_locked(fuse, hdr->nodeid); |
| DLOG(INFO) << "[" << handler->token << "] FORGET #" << req->nlookup |
| << " @ " << std::hex << hdr->nodeid |
| << " (" << (node ? node->name : "?") << ")"; |
| if (node) { |
| __u64 n = req->nlookup; |
| while (n) { |
| n--; |
| release_node_locked(node); |
| } |
| } |
| pthread_mutex_unlock(&fuse->global->lock); |
| return NO_STATUS; /* no reply */ |
| } |
| |
| static int handle_getattr(struct fuse* fuse, struct fuse_handler* handler, |
| const struct fuse_in_header *hdr, const struct fuse_getattr_in *req) |
| { |
| struct node* node; |
| char path[PATH_MAX]; |
| |
| pthread_mutex_lock(&fuse->global->lock); |
| node = lookup_node_and_path_by_id_locked(fuse, hdr->nodeid, path, sizeof(path)); |
| DLOG(INFO) << "[" << handler->token << "] GETATTR flags=" << req->getattr_flags |
| << " fh=" << std::hex << req->fh << " @ " << hdr->nodeid << std::dec |
| << " (" << (node ? node->name : "?") << ")"; |
| pthread_mutex_unlock(&fuse->global->lock); |
| |
| if (!node) { |
| return -ENOENT; |
| } |
| if (!check_caller_access_to_node(fuse, hdr, node, R_OK)) { |
| return -EACCES; |
| } |
| |
| return fuse_reply_attr(fuse, hdr->unique, node, path); |
| } |
| |
| static int handle_setattr(struct fuse* fuse, struct fuse_handler* handler, |
| const struct fuse_in_header *hdr, const struct fuse_setattr_in *req) |
| { |
| struct node* node; |
| char path[PATH_MAX]; |
| struct timespec times[2]; |
| |
| pthread_mutex_lock(&fuse->global->lock); |
| node = lookup_node_and_path_by_id_locked(fuse, hdr->nodeid, path, sizeof(path)); |
| DLOG(INFO) << "[" << handler->token << "] SETATTR fh=" << std::hex << req->fh |
| << " valid=" << std::hex << req->valid << " @ " << hdr->nodeid << std::dec |
| << " (" << (node ? node->name : "?") << ")"; |
| pthread_mutex_unlock(&fuse->global->lock); |
| |
| if (!node) { |
| return -ENOENT; |
| } |
| |
| if (!(req->valid & FATTR_FH) && |
| !check_caller_access_to_node(fuse, hdr, node, W_OK)) { |
| return -EACCES; |
| } |
| |
| /* XXX: incomplete implementation on purpose. |
| * chmod/chown should NEVER be implemented.*/ |
| |
| if ((req->valid & FATTR_SIZE) && truncate64(path, req->size) < 0) { |
| return -errno; |
| } |
| |
| /* Handle changing atime and mtime. If FATTR_ATIME_and FATTR_ATIME_NOW |
| * are both set, then set it to the current time. Else, set it to the |
| * time specified in the request. Same goes for mtime. Use utimensat(2) |
| * as it allows ATIME and MTIME to be changed independently, and has |
| * nanosecond resolution which fuse also has. |
| */ |
| if (req->valid & (FATTR_ATIME | FATTR_MTIME)) { |
| times[0].tv_nsec = UTIME_OMIT; |
| times[1].tv_nsec = UTIME_OMIT; |
| if (req->valid & FATTR_ATIME) { |
| if (req->valid & FATTR_ATIME_NOW) { |
| times[0].tv_nsec = UTIME_NOW; |
| } else { |
| times[0].tv_sec = req->atime; |
| times[0].tv_nsec = req->atimensec; |
| } |
| } |
| if (req->valid & FATTR_MTIME) { |
| if (req->valid & FATTR_MTIME_NOW) { |
| times[1].tv_nsec = UTIME_NOW; |
| } else { |
| times[1].tv_sec = req->mtime; |
| times[1].tv_nsec = req->mtimensec; |
| } |
| } |
| DLOG(INFO) << "[" << handler->token << "] Calling utimensat on " << path |
| << " with atime " << times[0].tv_sec << ", mtime=" << times[1].tv_sec; |
| if (utimensat(-1, path, times, 0) < 0) { |
| return -errno; |
| } |
| } |
| return fuse_reply_attr(fuse, hdr->unique, node, path); |
| } |
| |
| static int handle_mknod(struct fuse* fuse, struct fuse_handler* handler, |
| const struct fuse_in_header* hdr, const struct fuse_mknod_in* req, const char* name) |
| { |
| struct node* parent_node; |
| char parent_path[PATH_MAX]; |
| char child_path[PATH_MAX]; |
| const char* actual_name; |
| |
| pthread_mutex_lock(&fuse->global->lock); |
| parent_node = lookup_node_and_path_by_id_locked(fuse, hdr->nodeid, |
| parent_path, sizeof(parent_path)); |
| DLOG(INFO) << "[" << handler->token << "] MKNOD " << name << " 0" << std::oct << req->mode |
| << " @ " << std::hex << hdr->nodeid |
| << " (" << (parent_node ? parent_node->name : "?") << ")"; |
| pthread_mutex_unlock(&fuse->global->lock); |
| |
| if (!parent_node || !(actual_name = find_file_within(parent_path, name, |
| child_path, sizeof(child_path), 1))) { |
| return -ENOENT; |
| } |
| if (!check_caller_access_to_name(fuse, hdr, parent_node, name, W_OK)) { |
| return -EACCES; |
| } |
| __u32 mode = (req->mode & (~0777)) | 0664; |
| if (mknod(child_path, mode, req->rdev) < 0) { |
| return -errno; |
| } |
| return fuse_reply_entry(fuse, hdr->unique, parent_node, name, actual_name, child_path); |
| } |
| |
| static int handle_mkdir(struct fuse* fuse, struct fuse_handler* handler, |
| const struct fuse_in_header* hdr, const struct fuse_mkdir_in* req, const char* name) |
| { |
| struct node* parent_node; |
| char parent_path[PATH_MAX]; |
| char child_path[PATH_MAX]; |
| const char* actual_name; |
| |
| pthread_mutex_lock(&fuse->global->lock); |
| parent_node = lookup_node_and_path_by_id_locked(fuse, hdr->nodeid, |
| parent_path, sizeof(parent_path)); |
| DLOG(INFO) << "[" << handler->token << "] MKDIR " << name << " 0" << std::oct << req->mode |
| << " @ " << std::hex << hdr->nodeid |
| << " (" << (parent_node ? parent_node->name : "?") << ")"; |
| pthread_mutex_unlock(&fuse->global->lock); |
| |
| if (!parent_node || !(actual_name = find_file_within(parent_path, name, |
| child_path, sizeof(child_path), 1))) { |
| return -ENOENT; |
| } |
| if (!check_caller_access_to_name(fuse, hdr, parent_node, name, W_OK)) { |
| return -EACCES; |
| } |
| __u32 mode = (req->mode & (~0777)) | 0775; |
| if (mkdir(child_path, mode) < 0) { |
| return -errno; |
| } |
| |
| /* When creating /Android/data and /Android/obb, mark them as .nomedia */ |
| if (parent_node->perm == PERM_ANDROID && !strcasecmp(name, "data")) { |
| char nomedia[PATH_MAX]; |
| snprintf(nomedia, PATH_MAX, "%s/.nomedia", child_path); |
| if (touch(nomedia, 0664) != 0) { |
| PLOG(ERROR) << "touch(" << nomedia << ") failed"; |
| return -ENOENT; |
| } |
| } |
| if (parent_node->perm == PERM_ANDROID && !strcasecmp(name, "obb")) { |
| char nomedia[PATH_MAX]; |
| snprintf(nomedia, PATH_MAX, "%s/.nomedia", fuse->global->obb_path); |
| if (touch(nomedia, 0664) != 0) { |
| PLOG(ERROR) << "touch(" << nomedia << ") failed"; |
| return -ENOENT; |
| } |
| } |
| |
| return fuse_reply_entry(fuse, hdr->unique, parent_node, name, actual_name, child_path); |
| } |
| |
| static int handle_unlink(struct fuse* fuse, struct fuse_handler* handler, |
| const struct fuse_in_header* hdr, const char* name) |
| { |
| struct node* parent_node; |
| struct node* child_node; |
| char parent_path[PATH_MAX]; |
| char child_path[PATH_MAX]; |
| |
| pthread_mutex_lock(&fuse->global->lock); |
| parent_node = lookup_node_and_path_by_id_locked(fuse, hdr->nodeid, |
| parent_path, sizeof(parent_path)); |
| DLOG(INFO) << "[" << handler->token << "] UNLINK " << name << " @ " << std::hex << hdr->nodeid |
| << " (" << (parent_node ? parent_node->name : "?") << ")"; |
| pthread_mutex_unlock(&fuse->global->lock); |
| |
| if (!parent_node || !find_file_within(parent_path, name, |
| child_path, sizeof(child_path), 1)) { |
| return -ENOENT; |
| } |
| if (!check_caller_access_to_name(fuse, hdr, parent_node, name, W_OK)) { |
| return -EACCES; |
| } |
| if (unlink(child_path) < 0) { |
| return -errno; |
| } |
| pthread_mutex_lock(&fuse->global->lock); |
| child_node = lookup_child_by_name_locked(parent_node, name); |
| if (child_node) { |
| child_node->deleted = true; |
| } |
| pthread_mutex_unlock(&fuse->global->lock); |
| if (parent_node && child_node) { |
| /* Tell all other views that node is gone */ |
| DLOG(INFO) << "[" << handler->token << "] fuse_notify_delete" |
| << " parent=" << std::hex << parent_node->nid |
| << ", child=" << std::hex << child_node->nid << std::dec |
| << ", name=" << name; |
| if (fuse != fuse->global->fuse_default) { |
| fuse_notify_delete(fuse->global->fuse_default, parent_node->nid, child_node->nid, name); |
| } |
| if (fuse != fuse->global->fuse_read) { |
| fuse_notify_delete(fuse->global->fuse_read, parent_node->nid, child_node->nid, name); |
| } |
| if (fuse != fuse->global->fuse_write) { |
| fuse_notify_delete(fuse->global->fuse_write, parent_node->nid, child_node->nid, name); |
| } |
| } |
| return 0; |
| } |
| |
| static int handle_rmdir(struct fuse* fuse, struct fuse_handler* handler, |
| const struct fuse_in_header* hdr, const char* name) |
| { |
| struct node* child_node; |
| struct node* parent_node; |
| char parent_path[PATH_MAX]; |
| char child_path[PATH_MAX]; |
| |
| pthread_mutex_lock(&fuse->global->lock); |
| parent_node = lookup_node_and_path_by_id_locked(fuse, hdr->nodeid, |
| parent_path, sizeof(parent_path)); |
| DLOG(INFO) << "[" << handler->token << "] UNLINK " << name << " @ " << std::hex << hdr->nodeid |
| << " (" << (parent_node ? parent_node->name : "?") << ")"; |
| pthread_mutex_unlock(&fuse->global->lock); |
| |
| if (!parent_node || !find_file_within(parent_path, name, |
| child_path, sizeof(child_path), 1)) { |
| return -ENOENT; |
| } |
| if (!check_caller_access_to_name(fuse, hdr, parent_node, name, W_OK)) { |
| return -EACCES; |
| } |
| if (rmdir(child_path) < 0) { |
| return -errno; |
| } |
| pthread_mutex_lock(&fuse->global->lock); |
| child_node = lookup_child_by_name_locked(parent_node, name); |
| if (child_node) { |
| child_node->deleted = true; |
| } |
| pthread_mutex_unlock(&fuse->global->lock); |
| if (parent_node && child_node) { |
| /* Tell all other views that node is gone */ |
| DLOG(INFO) << "[" << handler->token << "] fuse_notify_delete" |
| << " parent=" << std::hex << parent_node->nid |
| << ", child=" << std::hex << child_node->nid << std::dec |
| << ", name=" << name; |
| if (fuse != fuse->global->fuse_default) { |
| fuse_notify_delete(fuse->global->fuse_default, parent_node->nid, child_node->nid, name); |
| } |
| if (fuse != fuse->global->fuse_read) { |
| fuse_notify_delete(fuse->global->fuse_read, parent_node->nid, child_node->nid, name); |
| } |
| if (fuse != fuse->global->fuse_write) { |
| fuse_notify_delete(fuse->global->fuse_write, parent_node->nid, child_node->nid, name); |
| } |
| } |
| return 0; |
| } |
| |
| static int handle_rename(struct fuse* fuse, struct fuse_handler* handler, |
| const struct fuse_in_header* hdr, const struct fuse_rename_in* req, |
| const char* old_name, const char* new_name) |
| { |
| struct node* old_parent_node; |
| struct node* new_parent_node; |
| struct node* child_node; |
| char old_parent_path[PATH_MAX]; |
| char new_parent_path[PATH_MAX]; |
| char old_child_path[PATH_MAX]; |
| char new_child_path[PATH_MAX]; |
| const char* new_actual_name; |
| int search; |
| int res; |
| |
| pthread_mutex_lock(&fuse->global->lock); |
| old_parent_node = lookup_node_and_path_by_id_locked(fuse, hdr->nodeid, |
| old_parent_path, sizeof(old_parent_path)); |
| new_parent_node = lookup_node_and_path_by_id_locked(fuse, req->newdir, |
| new_parent_path, sizeof(new_parent_path)); |
| DLOG(INFO) << "[" << handler->token << "] RENAME " << old_name << "->" << new_name |
| << " @ " << std::hex << hdr->nodeid |
| << " (" << (old_parent_node ? old_parent_node->name : "?") << ") -> " |
| << std::hex << req->newdir |
| << " (" << (new_parent_node ? new_parent_node->name : "?") << ")"; |
| if (!old_parent_node || !new_parent_node) { |
| res = -ENOENT; |
| goto lookup_error; |
| } |
| if (!check_caller_access_to_name(fuse, hdr, old_parent_node, old_name, W_OK)) { |
| res = -EACCES; |
| goto lookup_error; |
| } |
| if (!check_caller_access_to_name(fuse, hdr, new_parent_node, new_name, W_OK)) { |
| res = -EACCES; |
| goto lookup_error; |
| } |
| child_node = lookup_child_by_name_locked(old_parent_node, old_name); |
| if (!child_node || get_node_path_locked(child_node, |
| old_child_path, sizeof(old_child_path)) < 0) { |
| res = -ENOENT; |
| goto lookup_error; |
| } |
| acquire_node_locked(child_node); |
| pthread_mutex_unlock(&fuse->global->lock); |
| |
| /* Special case for renaming a file where destination is same path |
| * differing only by case. In this case we don't want to look for a case |
| * insensitive match. This allows commands like "mv foo FOO" to work as expected. |
| */ |
| search = old_parent_node != new_parent_node |
| || strcasecmp(old_name, new_name); |
| if (!(new_actual_name = find_file_within(new_parent_path, new_name, |
| new_child_path, sizeof(new_child_path), search))) { |
| res = -ENOENT; |
| goto io_error; |
| } |
| |
| DLOG(INFO) << "[" << handler->token << "] RENAME " << old_child_path << "->" << new_child_path; |
| res = rename(old_child_path, new_child_path); |
| if (res < 0) { |
| res = -errno; |
| goto io_error; |
| } |
| |
| pthread_mutex_lock(&fuse->global->lock); |
| res = rename_node_locked(child_node, new_name, new_actual_name); |
| if (!res) { |
| remove_node_from_parent_locked(child_node); |
| derive_permissions_locked(fuse, new_parent_node, child_node); |
| derive_permissions_recursive_locked(fuse, child_node); |
| add_node_to_parent_locked(child_node, new_parent_node); |
| } |
| goto done; |
| |
| io_error: |
| pthread_mutex_lock(&fuse->global->lock); |
| done: |
| release_node_locked(child_node); |
| lookup_error: |
| pthread_mutex_unlock(&fuse->global->lock); |
| return res; |
| } |
| |
| static int open_flags_to_access_mode(int open_flags) { |
| if ((open_flags & O_ACCMODE) == O_RDONLY) { |
| return R_OK; |
| } else if ((open_flags & O_ACCMODE) == O_WRONLY) { |
| return W_OK; |
| } else { |
| /* Probably O_RDRW, but treat as default to be safe */ |
| return R_OK | W_OK; |
| } |
| } |
| |
| static int handle_open(struct fuse* fuse, struct fuse_handler* handler, |
| const struct fuse_in_header* hdr, const struct fuse_open_in* req) |
| { |
| struct node* node; |
| char path[PATH_MAX]; |
| struct fuse_open_out out; |
| struct handle *h; |
| |
| pthread_mutex_lock(&fuse->global->lock); |
| node = lookup_node_and_path_by_id_locked(fuse, hdr->nodeid, path, sizeof(path)); |
| DLOG(INFO) << "[" << handler->token << "] OPEN 0" << std::oct << req->flags |
| << " @ " << std::hex << hdr->nodeid << std::dec |
| << " (" << (node ? node->name : "?") << ")"; |
| pthread_mutex_unlock(&fuse->global->lock); |
| |
| if (!node) { |
| return -ENOENT; |
| } |
| if (!check_caller_access_to_node(fuse, hdr, node, |
| open_flags_to_access_mode(req->flags))) { |
| return -EACCES; |
| } |
| h = static_cast<struct handle*>(malloc(sizeof(*h))); |
| if (!h) { |
| return -ENOMEM; |
| } |
| DLOG(INFO) << "[" << handler->token << "] OPEN " << path; |
| h->fd = open(path, req->flags); |
| if (h->fd < 0) { |
| free(h); |
| return -errno; |
| } |
| out.fh = ptr_to_id(h); |
| out.open_flags = 0; |
| out.padding = 0; |
| fuse_reply(fuse, hdr->unique, &out, sizeof(out)); |
| return NO_STATUS; |
| } |
| |
| static int handle_read(struct fuse* fuse, struct fuse_handler* handler, |
| const struct fuse_in_header* hdr, const struct fuse_read_in* req) |
| { |
| struct handle *h = static_cast<struct handle*>(id_to_ptr(req->fh)); |
| __u64 unique = hdr->unique; |
| __u32 size = req->size; |
| __u64 offset = req->offset; |
| int res; |
| __u8 *read_buffer = (__u8 *) ((uintptr_t)(handler->read_buffer + PAGE_SIZE) & ~((uintptr_t)PAGE_SIZE-1)); |
| |
| /* Don't access any other fields of hdr or req beyond this point, the read buffer |
| * overlaps the request buffer and will clobber data in the request. This |
| * saves us 128KB per request handler thread at the cost of this scary comment. */ |
| |
| DLOG(INFO) << "[" << handler->token << "] READ " << std::hex << h << std::dec |
| << "(" << h->fd << ") " << size << "@" << offset; |
| if (size > MAX_READ) { |
| return -EINVAL; |
| } |
| res = pread64(h->fd, read_buffer, size, offset); |
| if (res < 0) { |
| return -errno; |
| } |
| fuse_reply(fuse, unique, read_buffer, res); |
| return NO_STATUS; |
| } |
| |
| static int handle_write(struct fuse* fuse, struct fuse_handler* handler, |
| const struct fuse_in_header* hdr, const struct fuse_write_in* req, |
| const void* buffer) |
| { |
| struct fuse_write_out out; |
| struct handle *h = static_cast<struct handle*>(id_to_ptr(req->fh)); |
| int res; |
| __u8 aligned_buffer[req->size] __attribute__((__aligned__(PAGE_SIZE))); |
| |
| if (req->flags & O_DIRECT) { |
| memcpy(aligned_buffer, buffer, req->size); |
| buffer = (const __u8*) aligned_buffer; |
| } |
| |
| DLOG(INFO) << "[" << handler->token << "] WRITE " << std::hex << h << std::dec |
| << "(" << h->fd << ") " << req->size << "@" << req->offset; |
| res = pwrite64(h->fd, buffer, req->size, req->offset); |
| if (res < 0) { |
| return -errno; |
| } |
| out.size = res; |
| out.padding = 0; |
| fuse_reply(fuse, hdr->unique, &out, sizeof(out)); |
| return NO_STATUS; |
| } |
| |
| static int handle_statfs(struct fuse* fuse, struct fuse_handler* handler, |
| const struct fuse_in_header* hdr) |
| { |
| char path[PATH_MAX]; |
| struct statfs stat; |
| struct fuse_statfs_out out; |
| int res; |
| |
| pthread_mutex_lock(&fuse->global->lock); |
| DLOG(INFO) << "[" << handler->token << "] STATFS"; |
| res = get_node_path_locked(&fuse->global->root, path, sizeof(path)); |
| pthread_mutex_unlock(&fuse->global->lock); |
| if (res < 0) { |
| return -ENOENT; |
| } |
| if (statfs(fuse->global->root.name, &stat) < 0) { |
| return -errno; |
| } |
| memset(&out, 0, sizeof(out)); |
| out.st.blocks = stat.f_blocks; |
| out.st.bfree = stat.f_bfree; |
| out.st.bavail = stat.f_bavail; |
| out.st.files = stat.f_files; |
| out.st.ffree = stat.f_ffree; |
| out.st.bsize = stat.f_bsize; |
| out.st.namelen = stat.f_namelen; |
| out.st.frsize = stat.f_frsize; |
| fuse_reply(fuse, hdr->unique, &out, sizeof(out)); |
| return NO_STATUS; |
| } |
| |
| static int handle_release(struct fuse* fuse, struct fuse_handler* handler, |
| const struct fuse_in_header* hdr, const struct fuse_release_in* req) |
| { |
| struct handle *h = static_cast<struct handle*>(id_to_ptr(req->fh)); |
| |
| DLOG(INFO) << "[" << handler->token << "] RELEASE " << std::hex << h << std::dec |
| << "(" << h->fd << ")"; |
| close(h->fd); |
| free(h); |
| return 0; |
| } |
| |
| static int handle_fsync(struct fuse* fuse, struct fuse_handler* handler, |
| const struct fuse_in_header* hdr, const struct fuse_fsync_in* req) |
| { |
| bool is_dir = (hdr->opcode == FUSE_FSYNCDIR); |
| bool is_data_sync = req->fsync_flags & 1; |
| |
| int fd = -1; |
| if (is_dir) { |
| struct dirhandle *dh = static_cast<struct dirhandle*>(id_to_ptr(req->fh)); |
| fd = dirfd(dh->d); |
| } else { |
| struct handle *h = static_cast<struct handle*>(id_to_ptr(req->fh)); |
| fd = h->fd; |
| } |
| |
| DLOG(INFO) << "[" << handler->token << "] " << (is_dir ? "FSYNCDIR" : "FSYNC") << " " |
| << std::hex << req->fh << std::dec << "(" << fd << ") is_data_sync=" << is_data_sync; |
| int res = is_data_sync ? fdatasync(fd) : fsync(fd); |
| if (res == -1) { |
| return -errno; |
| } |
| return 0; |
| } |
| |
| static int handle_flush(struct fuse* fuse, struct fuse_handler* handler, |
| const struct fuse_in_header* hdr) |
| { |
| DLOG(INFO) << "[" << handler->token << "] FLUSH"; |
| return 0; |
| } |
| |
| static int handle_opendir(struct fuse* fuse, struct fuse_handler* handler, |
| const struct fuse_in_header* hdr, const struct fuse_open_in* req) |
| { |
| struct node* node; |
| char path[PATH_MAX]; |
| struct fuse_open_out out; |
| struct dirhandle *h; |
| |
| pthread_mutex_lock(&fuse->global->lock); |
| node = lookup_node_and_path_by_id_locked(fuse, hdr->nodeid, path, sizeof(path)); |
| DLOG(INFO) << "[" << handler->token << "] OPENDIR @ " << std::hex << hdr->nodeid |
| << " (" << (node ? node->name : "?") << ")"; |
| pthread_mutex_unlock(&fuse->global->lock); |
| |
| if (!node) { |
| return -ENOENT; |
| } |
| if (!check_caller_access_to_node(fuse, hdr, node, R_OK)) { |
| return -EACCES; |
| } |
| h = static_cast<struct dirhandle*>(malloc(sizeof(*h))); |
| if (!h) { |
| return -ENOMEM; |
| } |
| DLOG(INFO) << "[" << handler->token << "] OPENDIR " << path; |
| h->d = opendir(path); |
| if (!h->d) { |
| free(h); |
| return -errno; |
| } |
| out.fh = ptr_to_id(h); |
| out.open_flags = 0; |
| out.padding = 0; |
| fuse_reply(fuse, hdr->unique, &out, sizeof(out)); |
| return NO_STATUS; |
| } |
| |
| static int handle_readdir(struct fuse* fuse, struct fuse_handler* handler, |
| const struct fuse_in_header* hdr, const struct fuse_read_in* req) |
| { |
| char buffer[8192]; |
| struct fuse_dirent *fde = (struct fuse_dirent*) buffer; |
| struct dirent *de; |
| struct dirhandle *h = static_cast<struct dirhandle*>(id_to_ptr(req->fh)); |
| |
| DLOG(INFO) << "[" << handler->token << "] READDIR " << h; |
| if (req->offset == 0) { |
| /* rewinddir() might have been called above us, so rewind here too */ |
| DLOG(INFO) << "[" << handler->token << "] calling rewinddir()"; |
| rewinddir(h->d); |
| } |
| de = readdir(h->d); |
| if (!de) { |
| return 0; |
| } |
| fde->ino = FUSE_UNKNOWN_INO; |
| /* increment the offset so we can detect when rewinddir() seeks back to the beginning */ |
| fde->off = req->offset + 1; |
| fde->type = de->d_type; |
| fde->namelen = strlen(de->d_name); |
| memcpy(fde->name, de->d_name, fde->namelen + 1); |
| fuse_reply(fuse, hdr->unique, fde, |
| FUSE_DIRENT_ALIGN(sizeof(struct fuse_dirent) + fde->namelen)); |
| return NO_STATUS; |
| } |
| |
| static int handle_releasedir(struct fuse* fuse, struct fuse_handler* handler, |
| const struct fuse_in_header* hdr, const struct fuse_release_in* req) |
| { |
| struct dirhandle *h = static_cast<struct dirhandle*>(id_to_ptr(req->fh)); |
| |
| DLOG(INFO) << "[" << handler->token << "] RELEASEDIR " << h; |
| closedir(h->d); |
| free(h); |
| return 0; |
| } |
| |
| static int handle_init(struct fuse* fuse, struct fuse_handler* handler, |
| const struct fuse_in_header* hdr, const struct fuse_init_in* req) |
| { |
| struct fuse_init_out out; |
| size_t fuse_struct_size; |
| |
| DLOG(INFO) << "[" << handler->token << "] INIT ver=" << req->major << "." << req->minor |
| << " maxread=" << req->max_readahead << " flags=" << std::hex << req->flags; |
| |
| /* Kernel 2.6.16 is the first stable kernel with struct fuse_init_out |
| * defined (fuse version 7.6). The structure is the same from 7.6 through |
| * 7.22. Beginning with 7.23, the structure increased in size and added |
| * new parameters. |
| */ |
| if (req->major != FUSE_KERNEL_VERSION || req->minor < 6) { |
| LOG(ERROR) << "Fuse kernel version mismatch: Kernel version " |
| << req->major << "." << req->minor |
| << ", Expected at least " << FUSE_KERNEL_VERSION << ".6"; |
| return -1; |
| } |
| |
| /* We limit ourselves to 15 because we don't handle BATCH_FORGET yet */ |
| out.minor = MIN(req->minor, 15); |
| fuse_struct_size = sizeof(out); |
| #if defined(FUSE_COMPAT_22_INIT_OUT_SIZE) |
| /* FUSE_KERNEL_VERSION >= 23. */ |
| |
| /* If the kernel only works on minor revs older than or equal to 22, |
| * then use the older structure size since this code only uses the 7.22 |
| * version of the structure. */ |
| if (req->minor <= 22) { |
| fuse_struct_size = FUSE_COMPAT_22_INIT_OUT_SIZE; |
| } |
| #endif |
| |
| out.major = FUSE_KERNEL_VERSION; |
| out.max_readahead = req->max_readahead; |
| out.flags = FUSE_ATOMIC_O_TRUNC | FUSE_BIG_WRITES; |
| out.max_background = 32; |
| out.congestion_threshold = 32; |
| out.max_write = MAX_WRITE; |
| fuse_reply(fuse, hdr->unique, &out, fuse_struct_size); |
| return NO_STATUS; |
| } |
| |
| static int handle_canonical_path(struct fuse* fuse, struct fuse_handler* handler, |
| const struct fuse_in_header *hdr) |
| { |
| struct node* node; |
| char path[PATH_MAX]; |
| int len; |
| |
| pthread_mutex_lock(&fuse->global->lock); |
| node = lookup_node_and_path_by_id_locked(fuse, hdr->nodeid, |
| path, sizeof(path)); |
| TRACE("[%d] CANONICAL_PATH @ %" PRIx64 " (%s)\n", handler->token, hdr->nodeid, |
| node ? node->name : "?"); |
| pthread_mutex_unlock(&fuse->global->lock); |
| |
| if (!node) { |
| return -ENOENT; |
| } |
| if (!check_caller_access_to_node(fuse, hdr, node, R_OK)) { |
| return -EACCES; |
| } |
| len = strlen(path); |
| if (len + 1 > PATH_MAX) |
| len = PATH_MAX - 1; |
| path[PATH_MAX - 1] = 0; |
| fuse_reply(fuse, hdr->unique, path, len + 1); |
| return NO_STATUS; |
| } |
| |
| |
| static int handle_fuse_request(struct fuse *fuse, struct fuse_handler* handler, |
| const struct fuse_in_header *hdr, const void *data, size_t data_len) |
| { |
| switch (hdr->opcode) { |
| case FUSE_LOOKUP: { /* bytez[] -> entry_out */ |
| const char *name = static_cast<const char*>(data); |
| return handle_lookup(fuse, handler, hdr, name); |
| } |
| |
| case FUSE_FORGET: { |
| const struct fuse_forget_in *req = static_cast<const struct fuse_forget_in*>(data); |
| return handle_forget(fuse, handler, hdr, req); |
| } |
| |
| case FUSE_GETATTR: { /* getattr_in -> attr_out */ |
| const struct fuse_getattr_in *req = static_cast<const struct fuse_getattr_in*>(data); |
| return handle_getattr(fuse, handler, hdr, req); |
| } |
| |
| case FUSE_SETATTR: { /* setattr_in -> attr_out */ |
| const struct fuse_setattr_in *req = static_cast<const struct fuse_setattr_in*>(data); |
| return handle_setattr(fuse, handler, hdr, req); |
| } |
| |
| // case FUSE_READLINK: |
| // case FUSE_SYMLINK: |
| case FUSE_MKNOD: { /* mknod_in, bytez[] -> entry_out */ |
| const struct fuse_mknod_in *req = static_cast<const struct fuse_mknod_in*>(data); |
| const char *name = ((const char*) data) + sizeof(*req); |
| return handle_mknod(fuse, handler, hdr, req, name); |
| } |
| |
| case FUSE_MKDIR: { /* mkdir_in, bytez[] -> entry_out */ |
| const struct fuse_mkdir_in *req = static_cast<const struct fuse_mkdir_in*>(data); |
| const char *name = ((const char*) data) + sizeof(*req); |
| return handle_mkdir(fuse, handler, hdr, req, name); |
| } |
| |
| case FUSE_UNLINK: { /* bytez[] -> */ |
| const char *name = static_cast<const char*>(data); |
| return handle_unlink(fuse, handler, hdr, name); |
| } |
| |
| case FUSE_RMDIR: { /* bytez[] -> */ |
| const char *name = static_cast<const char*>(data); |
| return handle_rmdir(fuse, handler, hdr, name); |
| } |
| |
| case FUSE_RENAME: { /* rename_in, oldname, newname -> */ |
| const struct fuse_rename_in *req = static_cast<const struct fuse_rename_in*>(data); |
| const char *old_name = ((const char*) data) + sizeof(*req); |
| const char *new_name = old_name + strlen(old_name) + 1; |
| return handle_rename(fuse, handler, hdr, req, old_name, new_name); |
| } |
| |
| // case FUSE_LINK: |
| case FUSE_OPEN: { /* open_in -> open_out */ |
| const struct fuse_open_in *req = static_cast<const struct fuse_open_in*>(data); |
| return handle_open(fuse, handler, hdr, req); |
| } |
| |
| case FUSE_READ: { /* read_in -> byte[] */ |
| const struct fuse_read_in *req = static_cast<const struct fuse_read_in*>(data); |
| return handle_read(fuse, handler, hdr, req); |
| } |
| |
| case FUSE_WRITE: { /* write_in, byte[write_in.size] -> write_out */ |
| const struct fuse_write_in *req = static_cast<const struct fuse_write_in*>(data); |
| const void* buffer = (const __u8*)data + sizeof(*req); |
| return handle_write(fuse, handler, hdr, req, buffer); |
| } |
| |
| case FUSE_STATFS: { /* getattr_in -> attr_out */ |
| return handle_statfs(fuse, handler, hdr); |
| } |
| |
| case FUSE_RELEASE: { /* release_in -> */ |
| const struct fuse_release_in *req = static_cast<const struct fuse_release_in*>(data); |
| return handle_release(fuse, handler, hdr, req); |
| } |
| |
| case FUSE_FSYNC: |
| case FUSE_FSYNCDIR: { |
| const struct fuse_fsync_in *req = static_cast<const struct fuse_fsync_in*>(data); |
| return handle_fsync(fuse, handler, hdr, req); |
| } |
| |
| // case FUSE_SETXATTR: |
| // case FUSE_GETXATTR: |
| // case FUSE_LISTXATTR: |
| // case FUSE_REMOVEXATTR: |
| case FUSE_FLUSH: { |
| return handle_flush(fuse, handler, hdr); |
| } |
| |
| case FUSE_OPENDIR: { /* open_in -> open_out */ |
| const struct fuse_open_in *req = static_cast<const struct fuse_open_in*>(data); |
| return handle_opendir(fuse, handler, hdr, req); |
| } |
| |
| case FUSE_READDIR: { |
| const struct fuse_read_in *req = static_cast<const struct fuse_read_in*>(data); |
| return handle_readdir(fuse, handler, hdr, req); |
| } |
| |
| case FUSE_RELEASEDIR: { /* release_in -> */ |
| const struct fuse_release_in *req = static_cast<const struct fuse_release_in*>(data); |
| return handle_releasedir(fuse, handler, hdr, req); |
| } |
| |
| case FUSE_INIT: { /* init_in -> init_out */ |
| const struct fuse_init_in *req = static_cast<const struct fuse_init_in*>(data); |
| return handle_init(fuse, handler, hdr, req); |
| } |
| |
| case FUSE_CANONICAL_PATH: { /* nodeid -> bytez[] */ |
| return handle_canonical_path(fuse, handler, hdr); |
| } |
| |
| default: { |
| DLOG(INFO) << "[" << handler->token << "] NOTIMPL op=" << hdr->opcode |
| << "uniq=" << std::hex << hdr->unique << "nid=" << hdr->nodeid << std::dec; |
| return -ENOSYS; |
| } |
| } |
| } |
| |
| void handle_fuse_requests(struct fuse_handler* handler) |
| { |
| struct fuse* fuse = handler->fuse; |
| for (;;) { |
| ssize_t len = TEMP_FAILURE_RETRY(read(fuse->fd, |
| handler->request_buffer, sizeof(handler->request_buffer))); |
| if (len < 0) { |
| if (errno == ENODEV) { |
| LOG(ERROR) << "[" << handler->token << "] someone stole our marbles!"; |
| exit(2); |
| } |
| PLOG(ERROR) << "[" << handler->token << "] handle_fuse_requests"; |
| continue; |
| } |
| |
| if ((size_t)len < sizeof(struct fuse_in_header)) { |
| LOG(ERROR) << "[" << handler->token << "] request too short: len=" << len; |
| continue; |
| } |
| |
| const struct fuse_in_header* hdr = |
| reinterpret_cast<const struct fuse_in_header*>(handler->request_buffer); |
| if (hdr->len != (size_t)len) { |
| LOG(ERROR) << "[" << handler->token << "] malformed header: len=" << len |
| << ", hdr->len=" << hdr->len; |
| continue; |
| } |
| |
| const void *data = handler->request_buffer + sizeof(struct fuse_in_header); |
| size_t data_len = len - sizeof(struct fuse_in_header); |
| __u64 unique = hdr->unique; |
| int res = handle_fuse_request(fuse, handler, hdr, data, data_len); |
| |
| /* We do not access the request again after this point because the underlying |
| * buffer storage may have been reused while processing the request. */ |
| |
| if (res != NO_STATUS) { |
| if (res) { |
| DLOG(INFO) << "[" << handler->token << "] ERROR " << res; |
| } |
| fuse_status(fuse, unique, res); |
| } |
| } |
| } |