/* FUSE: Filesystem in Userspace Copyright (C) 2001-2007 Miklos Szeredi Implementation of the high-level FUSE API on top of the low-level API. This program can be distributed under the terms of the GNU LGPLv2. See the file COPYING.LIB */ #include "fuse_config.h" #include "fuse_i.h" #include "fuse_lowlevel.h" #include "fuse_opt.h" #include "fuse_misc.h" #include "fuse_kernel.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define FUSE_NODE_SLAB 1 #ifndef MAP_ANONYMOUS #undef FUSE_NODE_SLAB #endif #ifndef RENAME_EXCHANGE #define RENAME_EXCHANGE (1 << 1) /* Exchange source and dest */ #endif #define FUSE_DEFAULT_INTR_SIGNAL SIGUSR1 #define FUSE_UNKNOWN_INO 0xffffffff #define OFFSET_MAX 0x7fffffffffffffffLL #define NODE_TABLE_MIN_SIZE 8192 struct fuse_fs { struct fuse_operations op; void *user_data; int debug; }; struct fusemod_so { void *handle; int ctr; }; struct lock_queue_element { struct lock_queue_element *next; pthread_cond_t cond; fuse_ino_t nodeid1; const char *name1; char **path1; struct node **wnode1; fuse_ino_t nodeid2; const char *name2; char **path2; struct node **wnode2; int err; bool done : 1; }; struct node_table { struct node **array; size_t use; size_t size; size_t split; }; #define container_of(ptr, type, member) ({ \ const typeof( ((type *)0)->member ) *__mptr = (ptr); \ (type *)( (char *)__mptr - offsetof(type,member) );}) #define list_entry(ptr, type, member) \ container_of(ptr, type, member) struct list_head { struct list_head *next; struct list_head *prev; }; struct node_slab { struct list_head list; /* must be the first member */ struct list_head freelist; int used; }; struct fuse { struct fuse_session *se; struct node_table name_table; struct node_table id_table; struct list_head lru_table; fuse_ino_t ctr; unsigned int generation; unsigned int hidectr; pthread_mutex_t lock; struct fuse_config conf; int intr_installed; struct fuse_fs *fs; struct lock_queue_element *lockq; int pagesize; struct list_head partial_slabs; struct list_head full_slabs; pthread_t prune_thread; }; struct lock { int type; off_t start; off_t end; pid_t pid; uint64_t owner; struct lock *next; }; struct node { struct node *name_next; struct node *id_next; fuse_ino_t nodeid; unsigned int generation; int refctr; struct node *parent; char *name; uint64_t nlookup; int open_count; struct timespec stat_updated; struct timespec mtime; off_t size; struct lock *locks; unsigned int is_hidden : 1; unsigned int cache_valid : 1; int treelock; char inline_name[32]; }; #define TREELOCK_WRITE -1 #define TREELOCK_WAIT_OFFSET INT_MIN struct node_lru { struct node node; struct list_head lru; struct timespec forget_time; }; struct fuse_direntry { struct stat stat; char *name; struct fuse_direntry *next; }; struct fuse_dh { pthread_mutex_t lock; struct fuse *fuse; fuse_req_t req; char *contents; struct fuse_direntry *first; struct fuse_direntry **last; unsigned len; unsigned size; unsigned needlen; int filled; uint64_t fh; int error; fuse_ino_t nodeid; }; struct fuse_context_i { struct fuse_context ctx; fuse_req_t req; }; /* Defined by FUSE_REGISTER_MODULE() in lib/modules/subdir.c and iconv.c. */ extern fuse_module_factory_t fuse_module_subdir_factory; #ifdef HAVE_ICONV extern fuse_module_factory_t fuse_module_iconv_factory; #endif static pthread_key_t fuse_context_key; static pthread_mutex_t fuse_context_lock = PTHREAD_MUTEX_INITIALIZER; static int fuse_context_ref; static struct fuse_module *fuse_modules = NULL; static int fuse_register_module(const char *name, fuse_module_factory_t factory, struct fusemod_so *so) { struct fuse_module *mod; mod = calloc(1, sizeof(struct fuse_module)); if (!mod) { fuse_log(FUSE_LOG_ERR, "fuse: failed to allocate module\n"); return -1; } mod->name = strdup(name); if (!mod->name) { fuse_log(FUSE_LOG_ERR, "fuse: failed to allocate module name\n"); free(mod); return -1; } mod->factory = factory; mod->ctr = 0; mod->so = so; if (mod->so) mod->so->ctr++; mod->next = fuse_modules; fuse_modules = mod; return 0; } static void fuse_unregister_module(struct fuse_module *m) { struct fuse_module **mp; for (mp = &fuse_modules; *mp; mp = &(*mp)->next) { if (*mp == m) { *mp = (*mp)->next; break; } } free(m->name); free(m); } static int fuse_load_so_module(const char *module) { int ret = -1; char *tmp; struct fusemod_so *so; fuse_module_factory_t *factory; tmp = malloc(strlen(module) + 64); if (!tmp) { fuse_log(FUSE_LOG_ERR, "fuse: memory allocation failed\n"); return -1; } sprintf(tmp, "libfusemod_%s.so", module); so = calloc(1, sizeof(struct fusemod_so)); if (!so) { fuse_log(FUSE_LOG_ERR, "fuse: failed to allocate module so\n"); goto out; } so->handle = dlopen(tmp, RTLD_NOW); if (so->handle == NULL) { fuse_log(FUSE_LOG_ERR, "fuse: dlopen(%s) failed: %s\n", tmp, dlerror()); goto out_free_so; } sprintf(tmp, "fuse_module_%s_factory", module); factory = (fuse_module_factory_t*)dlsym(so->handle, tmp); if (factory == NULL) { fuse_log(FUSE_LOG_ERR, "fuse: symbol <%s> not found in module: %s\n", tmp, dlerror()); goto out_dlclose; } ret = fuse_register_module(module, *factory, so); if (ret) goto out_dlclose; out: free(tmp); return ret; out_dlclose: dlclose(so->handle); out_free_so: free(so); goto out; } static struct fuse_module *fuse_find_module(const char *module) { struct fuse_module *m; for (m = fuse_modules; m; m = m->next) { if (strcmp(module, m->name) == 0) { m->ctr++; break; } } return m; } static struct fuse_module *fuse_get_module(const char *module) { struct fuse_module *m; pthread_mutex_lock(&fuse_context_lock); m = fuse_find_module(module); if (!m) { int err = fuse_load_so_module(module); if (!err) m = fuse_find_module(module); } pthread_mutex_unlock(&fuse_context_lock); return m; } static void fuse_put_module(struct fuse_module *m) { pthread_mutex_lock(&fuse_context_lock); if (m->so) assert(m->ctr > 0); /* Builtin modules may already have m->ctr == 0 */ if (m->ctr > 0) m->ctr--; if (!m->ctr && m->so) { struct fusemod_so *so = m->so; assert(so->ctr > 0); so->ctr--; if (!so->ctr) { struct fuse_module **mp; for (mp = &fuse_modules; *mp;) { if ((*mp)->so == so) fuse_unregister_module(*mp); else mp = &(*mp)->next; } dlclose(so->handle); free(so); } } else if (!m->ctr) { fuse_unregister_module(m); } pthread_mutex_unlock(&fuse_context_lock); } static void init_list_head(struct list_head *list) { list->next = list; list->prev = list; } static int list_empty(const struct list_head *head) { return head->next == head; } static void list_add(struct list_head *new, struct list_head *prev, struct list_head *next) { next->prev = new; new->next = next; new->prev = prev; prev->next = new; } static inline void list_add_head(struct list_head *new, struct list_head *head) { list_add(new, head, head->next); } static inline void list_add_tail(struct list_head *new, struct list_head *head) { list_add(new, head->prev, head); } static inline void list_del(struct list_head *entry) { struct list_head *prev = entry->prev; struct list_head *next = entry->next; next->prev = prev; prev->next = next; } static inline int lru_enabled(struct fuse *f) { return f->conf.remember > 0; } static struct node_lru *node_lru(struct node *node) { return (struct node_lru *) node; } static size_t get_node_size(struct fuse *f) { if (lru_enabled(f)) return sizeof(struct node_lru); else return sizeof(struct node); } #ifdef FUSE_NODE_SLAB static struct node_slab *list_to_slab(struct list_head *head) { return (struct node_slab *) head; } static struct node_slab *node_to_slab(struct fuse *f, struct node *node) { return (struct node_slab *) (((uintptr_t) node) & ~((uintptr_t) f->pagesize - 1)); } static int alloc_slab(struct fuse *f) { void *mem; struct node_slab *slab; char *start; size_t num; size_t i; size_t node_size = get_node_size(f); mem = mmap(NULL, f->pagesize, PROT_READ | PROT_WRITE, MAP_PRIVATE | MAP_ANONYMOUS, -1, 0); if (mem == MAP_FAILED) return -1; slab = mem; init_list_head(&slab->freelist); slab->used = 0; num = (f->pagesize - sizeof(struct node_slab)) / node_size; start = (char *) mem + f->pagesize - num * node_size; for (i = 0; i < num; i++) { struct list_head *n; n = (struct list_head *) (start + i * node_size); list_add_tail(n, &slab->freelist); } list_add_tail(&slab->list, &f->partial_slabs); return 0; } static struct node *alloc_node(struct fuse *f) { struct node_slab *slab; struct list_head *node; if (list_empty(&f->partial_slabs)) { int res = alloc_slab(f); if (res != 0) return NULL; } slab = list_to_slab(f->partial_slabs.next); slab->used++; node = slab->freelist.next; list_del(node); if (list_empty(&slab->freelist)) { list_del(&slab->list); list_add_tail(&slab->list, &f->full_slabs); } memset(node, 0, sizeof(struct node)); return (struct node *) node; } static void free_slab(struct fuse *f, struct node_slab *slab) { int res; list_del(&slab->list); res = munmap(slab, f->pagesize); if (res == -1) fuse_log(FUSE_LOG_WARNING, "fuse warning: munmap(%p) failed\n", slab); } static void free_node_mem(struct fuse *f, struct node *node) { struct node_slab *slab = node_to_slab(f, node); struct list_head *n = (struct list_head *) node; slab->used--; if (slab->used) { if (list_empty(&slab->freelist)) { list_del(&slab->list); list_add_tail(&slab->list, &f->partial_slabs); } list_add_head(n, &slab->freelist); } else { free_slab(f, slab); } } #else static struct node *alloc_node(struct fuse *f) { return (struct node *) calloc(1, get_node_size(f)); } static void free_node_mem(struct fuse *f, struct node *node) { (void) f; free(node); } #endif static size_t id_hash(struct fuse *f, fuse_ino_t ino) { uint64_t hash = ((uint32_t) ino * 2654435761U) % f->id_table.size; uint64_t oldhash = hash % (f->id_table.size / 2); if (oldhash >= f->id_table.split) return oldhash; else return hash; } static struct node *get_node_nocheck(struct fuse *f, fuse_ino_t nodeid) { size_t hash = id_hash(f, nodeid); struct node *node; for (node = f->id_table.array[hash]; node != NULL; node = node->id_next) if (node->nodeid == nodeid) return node; return NULL; } static struct node *get_node(struct fuse *f, fuse_ino_t nodeid) { struct node *node = get_node_nocheck(f, nodeid); if (!node) { fuse_log(FUSE_LOG_ERR, "fuse internal error: node %llu not found\n", (unsigned long long) nodeid); abort(); } return node; } static void curr_time(struct timespec *now); static double diff_timespec(const struct timespec *t1, const struct timespec *t2); static void remove_node_lru(struct node *node) { struct node_lru *lnode = node_lru(node); list_del(&lnode->lru); init_list_head(&lnode->lru); } static void set_forget_time(struct fuse *f, struct node *node) { struct node_lru *lnode = node_lru(node); list_del(&lnode->lru); list_add_tail(&lnode->lru, &f->lru_table); curr_time(&lnode->forget_time); } static void free_node(struct fuse *f, struct node *node) { if (node->name != node->inline_name) free(node->name); free_node_mem(f, node); } static void node_table_reduce(struct node_table *t) { size_t newsize = t->size / 2; void *newarray; if (newsize < NODE_TABLE_MIN_SIZE) return; newarray = realloc(t->array, sizeof(struct node *) * newsize); if (newarray != NULL) t->array = newarray; t->size = newsize; t->split = t->size / 2; } static void remerge_id(struct fuse *f) { struct node_table *t = &f->id_table; int iter; if (t->split == 0) node_table_reduce(t); for (iter = 8; t->split > 0 && iter; iter--) { struct node **upper; t->split--; upper = &t->array[t->split + t->size / 2]; if (*upper) { struct node **nodep; for (nodep = &t->array[t->split]; *nodep; nodep = &(*nodep)->id_next); *nodep = *upper; *upper = NULL; break; } } } static void unhash_id(struct fuse *f, struct node *node) { struct node **nodep = &f->id_table.array[id_hash(f, node->nodeid)]; for (; *nodep != NULL; nodep = &(*nodep)->id_next) if (*nodep == node) { *nodep = node->id_next; f->id_table.use--; if(f->id_table.use < f->id_table.size / 4) remerge_id(f); return; } } static int node_table_resize(struct node_table *t) { size_t newsize = t->size * 2; void *newarray; newarray = realloc(t->array, sizeof(struct node *) * newsize); if (newarray == NULL) return -1; t->array = newarray; memset(t->array + t->size, 0, t->size * sizeof(struct node *)); t->size = newsize; t->split = 0; return 0; } static void rehash_id(struct fuse *f) { struct node_table *t = &f->id_table; struct node **nodep; struct node **next; size_t hash; if (t->split == t->size / 2) return; hash = t->split; t->split++; for (nodep = &t->array[hash]; *nodep != NULL; nodep = next) { struct node *node = *nodep; size_t newhash = id_hash(f, node->nodeid); if (newhash != hash) { next = nodep; *nodep = node->id_next; node->id_next = t->array[newhash]; t->array[newhash] = node; } else { next = &node->id_next; } } if (t->split == t->size / 2) node_table_resize(t); } static void hash_id(struct fuse *f, struct node *node) { size_t hash = id_hash(f, node->nodeid); node->id_next = f->id_table.array[hash]; f->id_table.array[hash] = node; f->id_table.use++; if (f->id_table.use >= f->id_table.size / 2) rehash_id(f); } static size_t name_hash(struct fuse *f, fuse_ino_t parent, const char *name) { uint64_t hash = parent; uint64_t oldhash; for (; *name; name++) hash = hash * 31 + (unsigned char) *name; hash %= f->name_table.size; oldhash = hash % (f->name_table.size / 2); if (oldhash >= f->name_table.split) return oldhash; else return hash; } static void unref_node(struct fuse *f, struct node *node); static void remerge_name(struct fuse *f) { struct node_table *t = &f->name_table; int iter; if (t->split == 0) node_table_reduce(t); for (iter = 8; t->split > 0 && iter; iter--) { struct node **upper; t->split--; upper = &t->array[t->split + t->size / 2]; if (*upper) { struct node **nodep; for (nodep = &t->array[t->split]; *nodep; nodep = &(*nodep)->name_next); *nodep = *upper; *upper = NULL; break; } } } static void unhash_name(struct fuse *f, struct node *node) { if (node->name) { size_t hash = name_hash(f, node->parent->nodeid, node->name); struct node **nodep = &f->name_table.array[hash]; for (; *nodep != NULL; nodep = &(*nodep)->name_next) if (*nodep == node) { *nodep = node->name_next; node->name_next = NULL; unref_node(f, node->parent); if (node->name != node->inline_name) free(node->name); node->name = NULL; node->parent = NULL; f->name_table.use--; if (f->name_table.use < f->name_table.size / 4) remerge_name(f); return; } fuse_log(FUSE_LOG_ERR, "fuse internal error: unable to unhash node: %llu\n", (unsigned long long) node->nodeid); abort(); } } static void rehash_name(struct fuse *f) { struct node_table *t = &f->name_table; struct node **nodep; struct node **next; size_t hash; if (t->split == t->size / 2) return; hash = t->split; t->split++; for (nodep = &t->array[hash]; *nodep != NULL; nodep = next) { struct node *node = *nodep; size_t newhash = name_hash(f, node->parent->nodeid, node->name); if (newhash != hash) { next = nodep; *nodep = node->name_next; node->name_next = t->array[newhash]; t->array[newhash] = node; } else { next = &node->name_next; } } if (t->split == t->size / 2) node_table_resize(t); } static int hash_name(struct fuse *f, struct node *node, fuse_ino_t parentid, const char *name) { size_t hash = name_hash(f, parentid, name); struct node *parent = get_node(f, parentid); if (strlen(name) < sizeof(node->inline_name)) { strcpy(node->inline_name, name); node->name = node->inline_name; } else { node->name = strdup(name); if (node->name == NULL) return -1; } parent->refctr ++; node->parent = parent; node->name_next = f->name_table.array[hash]; f->name_table.array[hash] = node; f->name_table.use++; if (f->name_table.use >= f->name_table.size / 2) rehash_name(f); return 0; } static void delete_node(struct fuse *f, struct node *node) { if (f->conf.debug) fuse_log(FUSE_LOG_DEBUG, "DELETE: %llu\n", (unsigned long long) node->nodeid); assert(node->treelock == 0); unhash_name(f, node); if (lru_enabled(f)) remove_node_lru(node); unhash_id(f, node); free_node(f, node); } static void unref_node(struct fuse *f, struct node *node) { assert(node->refctr > 0); node->refctr --; if (!node->refctr) delete_node(f, node); } static fuse_ino_t next_id(struct fuse *f) { do { f->ctr = (f->ctr + 1) & 0xffffffff; if (!f->ctr) f->generation ++; } while (f->ctr == 0 || f->ctr == FUSE_UNKNOWN_INO || get_node_nocheck(f, f->ctr) != NULL); return f->ctr; } static struct node *lookup_node(struct fuse *f, fuse_ino_t parent, const char *name) { size_t hash = name_hash(f, parent, name); struct node *node; for (node = f->name_table.array[hash]; node != NULL; node = node->name_next) if (node->parent->nodeid == parent && strcmp(node->name, name) == 0) return node; return NULL; } static void inc_nlookup(struct node *node) { if (!node->nlookup) node->refctr++; node->nlookup++; } static struct node *find_node(struct fuse *f, fuse_ino_t parent, const char *name) { struct node *node; pthread_mutex_lock(&f->lock); if (!name) node = get_node(f, parent); else node = lookup_node(f, parent, name); if (node == NULL) { node = alloc_node(f); if (node == NULL) goto out_err; node->nodeid = next_id(f); node->generation = f->generation; if (f->conf.remember) inc_nlookup(node); if (hash_name(f, node, parent, name) == -1) { free_node(f, node); node = NULL; goto out_err; } hash_id(f, node); if (lru_enabled(f)) { struct node_lru *lnode = node_lru(node); init_list_head(&lnode->lru); } } else if (lru_enabled(f) && node->nlookup == 1) { remove_node_lru(node); } inc_nlookup(node); out_err: pthread_mutex_unlock(&f->lock); return node; } static int lookup_path_in_cache(struct fuse *f, const char *path, fuse_ino_t *inop) { char *tmp = strdup(path); if (!tmp) return -ENOMEM; pthread_mutex_lock(&f->lock); fuse_ino_t ino = FUSE_ROOT_ID; int err = 0; char *save_ptr; char *path_element = strtok_r(tmp, "/", &save_ptr); while (path_element != NULL) { struct node *node = lookup_node(f, ino, path_element); if (node == NULL) { err = -ENOENT; break; } ino = node->nodeid; path_element = strtok_r(NULL, "/", &save_ptr); } pthread_mutex_unlock(&f->lock); free(tmp); if (!err) *inop = ino; return err; } static char *add_name(char **buf, unsigned *bufsize, char *s, const char *name) { size_t len = strlen(name); if (s - len <= *buf) { unsigned pathlen = *bufsize - (s - *buf); unsigned newbufsize = *bufsize; char *newbuf; while (newbufsize < pathlen + len + 1) { if (newbufsize >= 0x80000000) newbufsize = 0xffffffff; else newbufsize *= 2; } newbuf = realloc(*buf, newbufsize); if (newbuf == NULL) return NULL; *buf = newbuf; s = newbuf + newbufsize - pathlen; memmove(s, newbuf + *bufsize - pathlen, pathlen); *bufsize = newbufsize; } s -= len; memcpy(s, name, len); s--; *s = '/'; return s; } static void unlock_path(struct fuse *f, fuse_ino_t nodeid, struct node *wnode, struct node *end) { struct node *node; if (wnode) { assert(wnode->treelock == TREELOCK_WRITE); wnode->treelock = 0; } for (node = get_node(f, nodeid); node != end && node->nodeid != FUSE_ROOT_ID; node = node->parent) { assert(node->treelock != 0); assert(node->treelock != TREELOCK_WAIT_OFFSET); assert(node->treelock != TREELOCK_WRITE); node->treelock--; if (node->treelock == TREELOCK_WAIT_OFFSET) node->treelock = 0; } } static int try_get_path(struct fuse *f, fuse_ino_t nodeid, const char *name, char **path, struct node **wnodep, bool need_lock) { unsigned bufsize = 256; char *buf; char *s; struct node *node; struct node *wnode = NULL; int err; *path = NULL; err = -ENOMEM; buf = malloc(bufsize); if (buf == NULL) goto out_err; s = buf + bufsize - 1; *s = '\0'; if (name != NULL) { s = add_name(&buf, &bufsize, s, name); err = -ENOMEM; if (s == NULL) goto out_free; } if (wnodep) { assert(need_lock); wnode = lookup_node(f, nodeid, name); if (wnode) { if (wnode->treelock != 0) { if (wnode->treelock > 0) wnode->treelock += TREELOCK_WAIT_OFFSET; err = -EAGAIN; goto out_free; } wnode->treelock = TREELOCK_WRITE; } } for (node = get_node(f, nodeid); node->nodeid != FUSE_ROOT_ID; node = node->parent) { err = -ESTALE; if (node->name == NULL || node->parent == NULL) goto out_unlock; err = -ENOMEM; s = add_name(&buf, &bufsize, s, node->name); if (s == NULL) goto out_unlock; if (need_lock) { err = -EAGAIN; if (node->treelock < 0) goto out_unlock; node->treelock++; } } if (s[0]) memmove(buf, s, bufsize - (s - buf)); else strcpy(buf, "/"); *path = buf; if (wnodep) *wnodep = wnode; return 0; out_unlock: if (need_lock) unlock_path(f, nodeid, wnode, node); out_free: free(buf); out_err: return err; } static int try_get_path2(struct fuse *f, fuse_ino_t nodeid1, const char *name1, fuse_ino_t nodeid2, const char *name2, char **path1, char **path2, struct node **wnode1, struct node **wnode2) { int err; /* FIXME: locking two paths needs deadlock checking */ err = try_get_path(f, nodeid1, name1, path1, wnode1, true); if (!err) { err = try_get_path(f, nodeid2, name2, path2, wnode2, true); if (err) { struct node *wn1 = wnode1 ? *wnode1 : NULL; unlock_path(f, nodeid1, wn1, NULL); free(*path1); } } return err; } static void queue_element_wakeup(struct fuse *f, struct lock_queue_element *qe) { int err; if (!qe->path1) { /* Just waiting for it to be unlocked */ if (get_node(f, qe->nodeid1)->treelock == 0) pthread_cond_signal(&qe->cond); return; } if (qe->done) return; // Don't try to double-lock the element if (!qe->path2) { err = try_get_path(f, qe->nodeid1, qe->name1, qe->path1, qe->wnode1, true); } else { err = try_get_path2(f, qe->nodeid1, qe->name1, qe->nodeid2, qe->name2, qe->path1, qe->path2, qe->wnode1, qe->wnode2); } if (err == -EAGAIN) return; /* keep trying */ qe->err = err; qe->done = true; pthread_cond_signal(&qe->cond); } static void wake_up_queued(struct fuse *f) { struct lock_queue_element *qe; for (qe = f->lockq; qe != NULL; qe = qe->next) queue_element_wakeup(f, qe); } static void debug_path(struct fuse *f, const char *msg, fuse_ino_t nodeid, const char *name, bool wr) { if (f->conf.debug) { struct node *wnode = NULL; if (wr) wnode = lookup_node(f, nodeid, name); if (wnode) { fuse_log(FUSE_LOG_DEBUG, "%s %llu (w)\n", msg, (unsigned long long) wnode->nodeid); } else { fuse_log(FUSE_LOG_DEBUG, "%s %llu\n", msg, (unsigned long long) nodeid); } } } static void queue_path(struct fuse *f, struct lock_queue_element *qe) { struct lock_queue_element **qp; qe->done = false; pthread_cond_init(&qe->cond, NULL); qe->next = NULL; for (qp = &f->lockq; *qp != NULL; qp = &(*qp)->next); *qp = qe; } static void dequeue_path(struct fuse *f, struct lock_queue_element *qe) { struct lock_queue_element **qp; pthread_cond_destroy(&qe->cond); for (qp = &f->lockq; *qp != qe; qp = &(*qp)->next); *qp = qe->next; } static int wait_path(struct fuse *f, struct lock_queue_element *qe) { queue_path(f, qe); do { pthread_cond_wait(&qe->cond, &f->lock); } while (!qe->done); dequeue_path(f, qe); return qe->err; } static int get_path_common(struct fuse *f, fuse_ino_t nodeid, const char *name, char **path, struct node **wnode) { int err; pthread_mutex_lock(&f->lock); err = try_get_path(f, nodeid, name, path, wnode, true); if (err == -EAGAIN) { struct lock_queue_element qe = { .nodeid1 = nodeid, .name1 = name, .path1 = path, .wnode1 = wnode, }; debug_path(f, "QUEUE PATH", nodeid, name, !!wnode); err = wait_path(f, &qe); debug_path(f, "DEQUEUE PATH", nodeid, name, !!wnode); } pthread_mutex_unlock(&f->lock); return err; } static int get_path(struct fuse *f, fuse_ino_t nodeid, char **path) { return get_path_common(f, nodeid, NULL, path, NULL); } static int get_path_nullok(struct fuse *f, fuse_ino_t nodeid, char **path) { int err = 0; if (f->conf.nullpath_ok) { *path = NULL; } else { err = get_path_common(f, nodeid, NULL, path, NULL); if (err == -ESTALE) err = 0; } return err; } static int get_path_name(struct fuse *f, fuse_ino_t nodeid, const char *name, char **path) { return get_path_common(f, nodeid, name, path, NULL); } static int get_path_wrlock(struct fuse *f, fuse_ino_t nodeid, const char *name, char **path, struct node **wnode) { return get_path_common(f, nodeid, name, path, wnode); } #if defined(__FreeBSD__) #define CHECK_DIR_LOOP #endif #if defined(CHECK_DIR_LOOP) static int check_dir_loop(struct fuse *f, fuse_ino_t nodeid1, const char *name1, fuse_ino_t nodeid2, const char *name2) { struct node *node, *node1, *node2; fuse_ino_t id1, id2; node1 = lookup_node(f, nodeid1, name1); id1 = node1 ? node1->nodeid : nodeid1; node2 = lookup_node(f, nodeid2, name2); id2 = node2 ? node2->nodeid : nodeid2; for (node = get_node(f, id2); node->nodeid != FUSE_ROOT_ID; node = node->parent) { if (node->name == NULL || node->parent == NULL) break; if (node->nodeid != id2 && node->nodeid == id1) return -EINVAL; } if (node2) { for (node = get_node(f, id1); node->nodeid != FUSE_ROOT_ID; node = node->parent) { if (node->name == NULL || node->parent == NULL) break; if (node->nodeid != id1 && node->nodeid == id2) return -ENOTEMPTY; } } return 0; } #endif static int get_path2(struct fuse *f, fuse_ino_t nodeid1, const char *name1, fuse_ino_t nodeid2, const char *name2, char **path1, char **path2, struct node **wnode1, struct node **wnode2) { int err; pthread_mutex_lock(&f->lock); #if defined(CHECK_DIR_LOOP) if (name1) { // called during rename; perform dir loop check err = check_dir_loop(f, nodeid1, name1, nodeid2, name2); if (err) goto out_unlock; } #endif err = try_get_path2(f, nodeid1, name1, nodeid2, name2, path1, path2, wnode1, wnode2); if (err == -EAGAIN) { struct lock_queue_element qe = { .nodeid1 = nodeid1, .name1 = name1, .path1 = path1, .wnode1 = wnode1, .nodeid2 = nodeid2, .name2 = name2, .path2 = path2, .wnode2 = wnode2, }; debug_path(f, "QUEUE PATH1", nodeid1, name1, !!wnode1); debug_path(f, " PATH2", nodeid2, name2, !!wnode2); err = wait_path(f, &qe); debug_path(f, "DEQUEUE PATH1", nodeid1, name1, !!wnode1); debug_path(f, " PATH2", nodeid2, name2, !!wnode2); } #if defined(CHECK_DIR_LOOP) out_unlock: #endif pthread_mutex_unlock(&f->lock); return err; } static void free_path_wrlock(struct fuse *f, fuse_ino_t nodeid, struct node *wnode, char *path) { pthread_mutex_lock(&f->lock); unlock_path(f, nodeid, wnode, NULL); if (f->lockq) wake_up_queued(f); pthread_mutex_unlock(&f->lock); free(path); } static void free_path(struct fuse *f, fuse_ino_t nodeid, char *path) { if (path) free_path_wrlock(f, nodeid, NULL, path); } static void free_path2(struct fuse *f, fuse_ino_t nodeid1, fuse_ino_t nodeid2, struct node *wnode1, struct node *wnode2, char *path1, char *path2) { pthread_mutex_lock(&f->lock); unlock_path(f, nodeid1, wnode1, NULL); unlock_path(f, nodeid2, wnode2, NULL); wake_up_queued(f); pthread_mutex_unlock(&f->lock); free(path1); free(path2); } static void forget_node(struct fuse *f, fuse_ino_t nodeid, uint64_t nlookup) { struct node *node; if (nodeid == FUSE_ROOT_ID) return; pthread_mutex_lock(&f->lock); node = get_node(f, nodeid); /* * Node may still be locked due to interrupt idiocy in open, * create and opendir */ while (node->nlookup == nlookup && node->treelock) { struct lock_queue_element qe = { .nodeid1 = nodeid, }; debug_path(f, "QUEUE PATH (forget)", nodeid, NULL, false); queue_path(f, &qe); do { pthread_cond_wait(&qe.cond, &f->lock); } while (node->nlookup == nlookup && node->treelock); dequeue_path(f, &qe); debug_path(f, "DEQUEUE_PATH (forget)", nodeid, NULL, false); } assert(node->nlookup >= nlookup); node->nlookup -= nlookup; if (!node->nlookup) { unref_node(f, node); } else if (lru_enabled(f) && node->nlookup == 1) { set_forget_time(f, node); } pthread_mutex_unlock(&f->lock); } static void unlink_node(struct fuse *f, struct node *node) { if (f->conf.remember) { assert(node->nlookup > 1); node->nlookup--; } unhash_name(f, node); } static void remove_node(struct fuse *f, fuse_ino_t dir, const char *name) { struct node *node; pthread_mutex_lock(&f->lock); node = lookup_node(f, dir, name); if (node != NULL) unlink_node(f, node); pthread_mutex_unlock(&f->lock); } static int rename_node(struct fuse *f, fuse_ino_t olddir, const char *oldname, fuse_ino_t newdir, const char *newname, int hide) { struct node *node; struct node *newnode; int err = 0; pthread_mutex_lock(&f->lock); node = lookup_node(f, olddir, oldname); newnode = lookup_node(f, newdir, newname); if (node == NULL) goto out; if (newnode != NULL) { if (hide) { fuse_log(FUSE_LOG_ERR, "fuse: hidden file got created during hiding\n"); err = -EBUSY; goto out; } unlink_node(f, newnode); } unhash_name(f, node); if (hash_name(f, node, newdir, newname) == -1) { err = -ENOMEM; goto out; } if (hide) node->is_hidden = 1; out: pthread_mutex_unlock(&f->lock); return err; } static int exchange_node(struct fuse *f, fuse_ino_t olddir, const char *oldname, fuse_ino_t newdir, const char *newname) { struct node *oldnode; struct node *newnode; int err; pthread_mutex_lock(&f->lock); oldnode = lookup_node(f, olddir, oldname); newnode = lookup_node(f, newdir, newname); if (oldnode) unhash_name(f, oldnode); if (newnode) unhash_name(f, newnode); err = -ENOMEM; if (oldnode) { if (hash_name(f, oldnode, newdir, newname) == -1) goto out; } if (newnode) { if (hash_name(f, newnode, olddir, oldname) == -1) goto out; } err = 0; out: pthread_mutex_unlock(&f->lock); return err; } static void set_stat(struct fuse *f, fuse_ino_t nodeid, struct stat *stbuf) { if (!f->conf.use_ino) stbuf->st_ino = nodeid; if (f->conf.set_mode) stbuf->st_mode = (stbuf->st_mode & S_IFMT) | (0777 & ~f->conf.umask); if (f->conf.set_uid) stbuf->st_uid = f->conf.uid; if (f->conf.set_gid) stbuf->st_gid = f->conf.gid; } static struct fuse *req_fuse(fuse_req_t req) { return (struct fuse *) fuse_req_userdata(req); } static void fuse_intr_sighandler(int sig) { (void) sig; /* Nothing to do */ } struct fuse_intr_data { pthread_t id; pthread_cond_t cond; int finished; }; static void fuse_interrupt(fuse_req_t req, void *d_) { struct fuse_intr_data *d = d_; struct fuse *f = req_fuse(req); if (d->id == pthread_self()) return; pthread_mutex_lock(&f->lock); while (!d->finished) { struct timeval now; struct timespec timeout; pthread_kill(d->id, f->conf.intr_signal); gettimeofday(&now, NULL); timeout.tv_sec = now.tv_sec + 1; timeout.tv_nsec = now.tv_usec * 1000; pthread_cond_timedwait(&d->cond, &f->lock, &timeout); } pthread_mutex_unlock(&f->lock); } static void fuse_do_finish_interrupt(struct fuse *f, fuse_req_t req, struct fuse_intr_data *d) { pthread_mutex_lock(&f->lock); d->finished = 1; pthread_cond_broadcast(&d->cond); pthread_mutex_unlock(&f->lock); fuse_req_interrupt_func(req, NULL, NULL); pthread_cond_destroy(&d->cond); } static void fuse_do_prepare_interrupt(fuse_req_t req, struct fuse_intr_data *d) { d->id = pthread_self(); pthread_cond_init(&d->cond, NULL); d->finished = 0; fuse_req_interrupt_func(req, fuse_interrupt, d); } static inline void fuse_finish_interrupt(struct fuse *f, fuse_req_t req, struct fuse_intr_data *d) { if (f->conf.intr) fuse_do_finish_interrupt(f, req, d); } static inline void fuse_prepare_interrupt(struct fuse *f, fuse_req_t req, struct fuse_intr_data *d) { if (f->conf.intr) fuse_do_prepare_interrupt(req, d); } static const char* file_info_string(struct fuse_file_info *fi, char* buf, size_t len) { if(fi == NULL) return "NULL"; snprintf(buf, len, "%llu", (unsigned long long) fi->fh); return buf; } int fuse_fs_getattr(struct fuse_fs *fs, const char *path, struct stat *buf, struct fuse_file_info *fi) { fuse_get_context()->private_data = fs->user_data; if (fs->op.getattr) { if (fs->debug) { char buf[10]; fuse_log(FUSE_LOG_DEBUG, "getattr[%s] %s\n", file_info_string(fi, buf, sizeof(buf)), path); } return fs->op.getattr(path, buf, fi); } else { return -ENOSYS; } } int fuse_fs_rename(struct fuse_fs *fs, const char *oldpath, const char *newpath, unsigned int flags) { fuse_get_context()->private_data = fs->user_data; if (fs->op.rename) { if (fs->debug) fuse_log(FUSE_LOG_DEBUG, "rename %s %s 0x%x\n", oldpath, newpath, flags); return fs->op.rename(oldpath, newpath, flags); } else { return -ENOSYS; } } int fuse_fs_unlink(struct fuse_fs *fs, const char *path) { fuse_get_context()->private_data = fs->user_data; if (fs->op.unlink) { if (fs->debug) fuse_log(FUSE_LOG_DEBUG, "unlink %s\n", path); return fs->op.unlink(path); } else { return -ENOSYS; } } int fuse_fs_rmdir(struct fuse_fs *fs, const char *path) { fuse_get_context()->private_data = fs->user_data; if (fs->op.rmdir) { if (fs->debug) fuse_log(FUSE_LOG_DEBUG, "rmdir %s\n", path); return fs->op.rmdir(path); } else { return -ENOSYS; } } int fuse_fs_symlink(struct fuse_fs *fs, const char *linkname, const char *path) { fuse_get_context()->private_data = fs->user_data; if (fs->op.symlink) { if (fs->debug) fuse_log(FUSE_LOG_DEBUG, "symlink %s %s\n", linkname, path); return fs->op.symlink(linkname, path); } else { return -ENOSYS; } } int fuse_fs_link(struct fuse_fs *fs, const char *oldpath, const char *newpath) { fuse_get_context()->private_data = fs->user_data; if (fs->op.link) { if (fs->debug) fuse_log(FUSE_LOG_DEBUG, "link %s %s\n", oldpath, newpath); return fs->op.link(oldpath, newpath); } else { return -ENOSYS; } } int fuse_fs_release(struct fuse_fs *fs, const char *path, struct fuse_file_info *fi) { fuse_get_context()->private_data = fs->user_data; if (fs->op.release) { if (fs->debug) fuse_log(FUSE_LOG_DEBUG, "release%s[%llu] flags: 0x%x\n", fi->flush ? "+flush" : "", (unsigned long long) fi->fh, fi->flags); return fs->op.release(path, fi); } else { return 0; } } int fuse_fs_opendir(struct fuse_fs *fs, const char *path, struct fuse_file_info *fi) { fuse_get_context()->private_data = fs->user_data; if (fs->op.opendir) { int err; if (fs->debug) fuse_log(FUSE_LOG_DEBUG, "opendir flags: 0x%x %s\n", fi->flags, path); err = fs->op.opendir(path, fi); if (fs->debug && !err) fuse_log(FUSE_LOG_DEBUG, " opendir[%llu] flags: 0x%x %s\n", (unsigned long long) fi->fh, fi->flags, path); return err; } else { return 0; } } int fuse_fs_open(struct fuse_fs *fs, const char *path, struct fuse_file_info *fi) { fuse_get_context()->private_data = fs->user_data; if (fs->op.open) { int err; if (fs->debug) fuse_log(FUSE_LOG_DEBUG, "open flags: 0x%x %s\n", fi->flags, path); err = fs->op.open(path, fi); if (fs->debug && !err) fuse_log(FUSE_LOG_DEBUG, " open[%llu] flags: 0x%x %s\n", (unsigned long long) fi->fh, fi->flags, path); return err; } else { return 0; } } static void fuse_free_buf(struct fuse_bufvec *buf) { if (buf != NULL) { size_t i; for (i = 0; i < buf->count; i++) if (!(buf->buf[i].flags & FUSE_BUF_IS_FD)) free(buf->buf[i].mem); free(buf); } } int fuse_fs_read_buf(struct fuse_fs *fs, const char *path, struct fuse_bufvec **bufp, size_t size, off_t off, struct fuse_file_info *fi) { fuse_get_context()->private_data = fs->user_data; if (fs->op.read || fs->op.read_buf) { int res; if (fs->debug) fuse_log(FUSE_LOG_DEBUG, "read[%llu] %zu bytes from %llu flags: 0x%x\n", (unsigned long long) fi->fh, size, (unsigned long long) off, fi->flags); if (fs->op.read_buf) { res = fs->op.read_buf(path, bufp, size, off, fi); } else { struct fuse_bufvec *buf; void *mem; buf = malloc(sizeof(struct fuse_bufvec)); if (buf == NULL) return -ENOMEM; mem = malloc(size); if (mem == NULL) { free(buf); return -ENOMEM; } *buf = FUSE_BUFVEC_INIT(size); buf->buf[0].mem = mem; *bufp = buf; res = fs->op.read(path, mem, size, off, fi); if (res >= 0) buf->buf[0].size = res; } if (fs->debug && res >= 0) fuse_log(FUSE_LOG_DEBUG, " read[%llu] %zu bytes from %llu\n", (unsigned long long) fi->fh, fuse_buf_size(*bufp), (unsigned long long) off); if (res >= 0 && fuse_buf_size(*bufp) > size) fuse_log(FUSE_LOG_ERR, "fuse: read too many bytes\n"); if (res < 0) return res; return 0; } else { return -ENOSYS; } } int fuse_fs_read(struct fuse_fs *fs, const char *path, char *mem, size_t size, off_t off, struct fuse_file_info *fi) { fuse_get_context()->private_data = fs->user_data; if (fs->op.read || fs->op.read_buf) { int res; if (fs->debug) fuse_log(FUSE_LOG_DEBUG, "read[%llu] %zu bytes from %llu flags: 0x%x\n", (unsigned long long) fi->fh, size, (unsigned long long) off, fi->flags); if (fs->op.read_buf) { struct fuse_bufvec *buf = NULL; res = fs->op.read_buf(path, &buf, size, off, fi); if (res == 0) { struct fuse_bufvec dst = FUSE_BUFVEC_INIT(size); dst.buf[0].mem = mem; res = fuse_buf_copy(&dst, buf, 0); } fuse_free_buf(buf); } else { res = fs->op.read(path, mem, size, off, fi); } if (fs->debug && res >= 0) fuse_log(FUSE_LOG_DEBUG, " read[%llu] %u bytes from %llu\n", (unsigned long long) fi->fh, res, (unsigned long long) off); if (res >= 0 && res > (int) size) fuse_log(FUSE_LOG_ERR, "fuse: read too many bytes\n"); return res; } else { return -ENOSYS; } } int fuse_fs_write_buf(struct fuse_fs *fs, const char *path, struct fuse_bufvec *buf, off_t off, struct fuse_file_info *fi) { fuse_get_context()->private_data = fs->user_data; if (fs->op.write_buf || fs->op.write) { int res; size_t size = fuse_buf_size(buf); assert(buf->idx == 0 && buf->off == 0); if (fs->debug) fuse_log(FUSE_LOG_DEBUG, "write%s[%llu] %zu bytes to %llu flags: 0x%x\n", fi->writepage ? "page" : "", (unsigned long long) fi->fh, size, (unsigned long long) off, fi->flags); if (fs->op.write_buf) { res = fs->op.write_buf(path, buf, off, fi); } else { void *mem = NULL; struct fuse_buf *flatbuf; struct fuse_bufvec tmp = FUSE_BUFVEC_INIT(size); if (buf->count == 1 && !(buf->buf[0].flags & FUSE_BUF_IS_FD)) { flatbuf = &buf->buf[0]; } else { res = -ENOMEM; mem = malloc(size); if (mem == NULL) goto out; tmp.buf[0].mem = mem; res = fuse_buf_copy(&tmp, buf, 0); if (res <= 0) goto out_free; tmp.buf[0].size = res; flatbuf = &tmp.buf[0]; } res = fs->op.write(path, flatbuf->mem, flatbuf->size, off, fi); out_free: free(mem); } out: if (fs->debug && res >= 0) fuse_log(FUSE_LOG_DEBUG, " write%s[%llu] %u bytes to %llu\n", fi->writepage ? "page" : "", (unsigned long long) fi->fh, res, (unsigned long long) off); if (res > (int) size) fuse_log(FUSE_LOG_ERR, "fuse: wrote too many bytes\n"); return res; } else { return -ENOSYS; } } int fuse_fs_write(struct fuse_fs *fs, const char *path, const char *mem, size_t size, off_t off, struct fuse_file_info *fi) { struct fuse_bufvec bufv = FUSE_BUFVEC_INIT(size); bufv.buf[0].mem = (void *) mem; return fuse_fs_write_buf(fs, path, &bufv, off, fi); } int fuse_fs_fsync(struct fuse_fs *fs, const char *path, int datasync, struct fuse_file_info *fi) { fuse_get_context()->private_data = fs->user_data; if (fs->op.fsync) { if (fs->debug) fuse_log(FUSE_LOG_DEBUG, "fsync[%llu] datasync: %i\n", (unsigned long long) fi->fh, datasync); return fs->op.fsync(path, datasync, fi); } else { return -ENOSYS; } } int fuse_fs_fsyncdir(struct fuse_fs *fs, const char *path, int datasync, struct fuse_file_info *fi) { fuse_get_context()->private_data = fs->user_data; if (fs->op.fsyncdir) { if (fs->debug) fuse_log(FUSE_LOG_DEBUG, "fsyncdir[%llu] datasync: %i\n", (unsigned long long) fi->fh, datasync); return fs->op.fsyncdir(path, datasync, fi); } else { return -ENOSYS; } } int fuse_fs_flush(struct fuse_fs *fs, const char *path, struct fuse_file_info *fi) { fuse_get_context()->private_data = fs->user_data; if (fs->op.flush) { if (fs->debug) fuse_log(FUSE_LOG_DEBUG, "flush[%llu]\n", (unsigned long long) fi->fh); return fs->op.flush(path, fi); } else { return -ENOSYS; } } int fuse_fs_statfs(struct fuse_fs *fs, const char *path, struct statvfs *buf) { fuse_get_context()->private_data = fs->user_data; if (fs->op.statfs) { if (fs->debug) fuse_log(FUSE_LOG_DEBUG, "statfs %s\n", path); return fs->op.statfs(path, buf); } else { buf->f_namemax = 255; buf->f_bsize = 512; return 0; } } int fuse_fs_releasedir(struct fuse_fs *fs, const char *path, struct fuse_file_info *fi) { fuse_get_context()->private_data = fs->user_data; if (fs->op.releasedir) { if (fs->debug) fuse_log(FUSE_LOG_DEBUG, "releasedir[%llu] flags: 0x%x\n", (unsigned long long) fi->fh, fi->flags); return fs->op.releasedir(path, fi); } else { return 0; } } int fuse_fs_readdir(struct fuse_fs *fs, const char *path, void *buf, fuse_fill_dir_t filler, off_t off, struct fuse_file_info *fi, enum fuse_readdir_flags flags) { fuse_get_context()->private_data = fs->user_data; if (fs->op.readdir) { if (fs->debug) { fuse_log(FUSE_LOG_DEBUG, "readdir%s[%llu] from %llu\n", (flags & FUSE_READDIR_PLUS) ? "plus" : "", (unsigned long long) fi->fh, (unsigned long long) off); } return fs->op.readdir(path, buf, filler, off, fi, flags); } else { return -ENOSYS; } } int fuse_fs_create(struct fuse_fs *fs, const char *path, mode_t mode, struct fuse_file_info *fi) { fuse_get_context()->private_data = fs->user_data; if (fs->op.create) { int err; if (fs->debug) fuse_log(FUSE_LOG_DEBUG, "create flags: 0x%x %s 0%o umask=0%03o\n", fi->flags, path, mode, fuse_get_context()->umask); err = fs->op.create(path, mode, fi); if (fs->debug && !err) fuse_log(FUSE_LOG_DEBUG, " create[%llu] flags: 0x%x %s\n", (unsigned long long) fi->fh, fi->flags, path); return err; } else { return -ENOSYS; } } int fuse_fs_lock(struct fuse_fs *fs, const char *path, struct fuse_file_info *fi, int cmd, struct flock *lock) { fuse_get_context()->private_data = fs->user_data; if (fs->op.lock) { if (fs->debug) fuse_log(FUSE_LOG_DEBUG, "lock[%llu] %s %s start: %llu len: %llu pid: %llu\n", (unsigned long long) fi->fh, (cmd == F_GETLK ? "F_GETLK" : (cmd == F_SETLK ? "F_SETLK" : (cmd == F_SETLKW ? "F_SETLKW" : "???"))), (lock->l_type == F_RDLCK ? "F_RDLCK" : (lock->l_type == F_WRLCK ? "F_WRLCK" : (lock->l_type == F_UNLCK ? "F_UNLCK" : "???"))), (unsigned long long) lock->l_start, (unsigned long long) lock->l_len, (unsigned long long) lock->l_pid); return fs->op.lock(path, fi, cmd, lock); } else { return -ENOSYS; } } int fuse_fs_flock(struct fuse_fs *fs, const char *path, struct fuse_file_info *fi, int op) { fuse_get_context()->private_data = fs->user_data; if (fs->op.flock) { if (fs->debug) { int xop = op & ~LOCK_NB; fuse_log(FUSE_LOG_DEBUG, "lock[%llu] %s%s\n", (unsigned long long) fi->fh, xop == LOCK_SH ? "LOCK_SH" : (xop == LOCK_EX ? "LOCK_EX" : (xop == LOCK_UN ? "LOCK_UN" : "???")), (op & LOCK_NB) ? "|LOCK_NB" : ""); } return fs->op.flock(path, fi, op); } else { return -ENOSYS; } } int fuse_fs_chown(struct fuse_fs *fs, const char *path, uid_t uid, gid_t gid, struct fuse_file_info *fi) { fuse_get_context()->private_data = fs->user_data; if (fs->op.chown) { if (fs->debug) { char buf[10]; fuse_log(FUSE_LOG_DEBUG, "chown[%s] %s %lu %lu\n", file_info_string(fi, buf, sizeof(buf)), path, (unsigned long) uid, (unsigned long) gid); } return fs->op.chown(path, uid, gid, fi); } else { return -ENOSYS; } } int fuse_fs_truncate(struct fuse_fs *fs, const char *path, off_t size, struct fuse_file_info *fi) { fuse_get_context()->private_data = fs->user_data; if (fs->op.truncate) { if (fs->debug) { char buf[10]; fuse_log(FUSE_LOG_DEBUG, "truncate[%s] %llu\n", file_info_string(fi, buf, sizeof(buf)), (unsigned long long) size); } return fs->op.truncate(path, size, fi); } else { return -ENOSYS; } } int fuse_fs_utimens(struct fuse_fs *fs, const char *path, const struct timespec tv[2], struct fuse_file_info *fi) { fuse_get_context()->private_data = fs->user_data; if (fs->op.utimens) { if (fs->debug) { char buf[10]; fuse_log(FUSE_LOG_DEBUG, "utimens[%s] %s %li.%09lu %li.%09lu\n", file_info_string(fi, buf, sizeof(buf)), path, tv[0].tv_sec, tv[0].tv_nsec, tv[1].tv_sec, tv[1].tv_nsec); } return fs->op.utimens(path, tv, fi); } else { return -ENOSYS; } } int fuse_fs_access(struct fuse_fs *fs, const char *path, int mask) { fuse_get_context()->private_data = fs->user_data; if (fs->op.access) { if (fs->debug) fuse_log(FUSE_LOG_DEBUG, "access %s 0%o\n", path, mask); return fs->op.access(path, mask); } else { return -ENOSYS; } } int fuse_fs_readlink(struct fuse_fs *fs, const char *path, char *buf, size_t len) { fuse_get_context()->private_data = fs->user_data; if (fs->op.readlink) { if (fs->debug) fuse_log(FUSE_LOG_DEBUG, "readlink %s %lu\n", path, (unsigned long) len); return fs->op.readlink(path, buf, len); } else { return -ENOSYS; } } int fuse_fs_mknod(struct fuse_fs *fs, const char *path, mode_t mode, dev_t rdev) { fuse_get_context()->private_data = fs->user_data; if (fs->op.mknod) { if (fs->debug) fuse_log(FUSE_LOG_DEBUG, "mknod %s 0%o 0x%llx umask=0%03o\n", path, mode, (unsigned long long) rdev, fuse_get_context()->umask); return fs->op.mknod(path, mode, rdev); } else { return -ENOSYS; } } int fuse_fs_mkdir(struct fuse_fs *fs, const char *path, mode_t mode) { fuse_get_context()->private_data = fs->user_data; if (fs->op.mkdir) { if (fs->debug) fuse_log(FUSE_LOG_DEBUG, "mkdir %s 0%o umask=0%03o\n", path, mode, fuse_get_context()->umask); return fs->op.mkdir(path, mode); } else { return -ENOSYS; } } int fuse_fs_setxattr(struct fuse_fs *fs, const char *path, const char *name, const char *value, size_t size, int flags) { fuse_get_context()->private_data = fs->user_data; if (fs->op.setxattr) { if (fs->debug) fuse_log(FUSE_LOG_DEBUG, "setxattr %s %s %lu 0x%x\n", path, name, (unsigned long) size, flags); return fs->op.setxattr(path, name, value, size, flags); } else { return -ENOSYS; } } int fuse_fs_getxattr(struct fuse_fs *fs, const char *path, const char *name, char *value, size_t size) { fuse_get_context()->private_data = fs->user_data; if (fs->op.getxattr) { if (fs->debug) fuse_log(FUSE_LOG_DEBUG, "getxattr %s %s %lu\n", path, name, (unsigned long) size); return fs->op.getxattr(path, name, value, size); } else { return -ENOSYS; } } int fuse_fs_listxattr(struct fuse_fs *fs, const char *path, char *list, size_t size) { fuse_get_context()->private_data = fs->user_data; if (fs->op.listxattr) { if (fs->debug) fuse_log(FUSE_LOG_DEBUG, "listxattr %s %lu\n", path, (unsigned long) size); return fs->op.listxattr(path, list, size); } else { return -ENOSYS; } } int fuse_fs_bmap(struct fuse_fs *fs, const char *path, size_t blocksize, uint64_t *idx) { fuse_get_context()->private_data = fs->user_data; if (fs->op.bmap) { if (fs->debug) fuse_log(FUSE_LOG_DEBUG, "bmap %s blocksize: %lu index: %llu\n", path, (unsigned long) blocksize, (unsigned long long) *idx); return fs->op.bmap(path, blocksize, idx); } else { return -ENOSYS; } } int fuse_fs_removexattr(struct fuse_fs *fs, const char *path, const char *name) { fuse_get_context()->private_data = fs->user_data; if (fs->op.removexattr) { if (fs->debug) fuse_log(FUSE_LOG_DEBUG, "removexattr %s %s\n", path, name); return fs->op.removexattr(path, name); } else { return -ENOSYS; } } int fuse_fs_ioctl(struct fuse_fs *fs, const char *path, unsigned int cmd, void *arg, struct fuse_file_info *fi, unsigned int flags, void *data) { fuse_get_context()->private_data = fs->user_data; if (fs->op.ioctl) { if (fs->debug) fuse_log(FUSE_LOG_DEBUG, "ioctl[%llu] 0x%x flags: 0x%x\n", (unsigned long long) fi->fh, cmd, flags); return fs->op.ioctl(path, cmd, arg, fi, flags, data); } else return -ENOSYS; } int fuse_fs_poll(struct fuse_fs *fs, const char *path, struct fuse_file_info *fi, struct fuse_pollhandle *ph, unsigned *reventsp) { fuse_get_context()->private_data = fs->user_data; if (fs->op.poll) { int res; if (fs->debug) fuse_log(FUSE_LOG_DEBUG, "poll[%llu] ph: %p, events 0x%x\n", (unsigned long long) fi->fh, ph, fi->poll_events); res = fs->op.poll(path, fi, ph, reventsp); if (fs->debug && !res) fuse_log(FUSE_LOG_DEBUG, " poll[%llu] revents: 0x%x\n", (unsigned long long) fi->fh, *reventsp); return res; } else return -ENOSYS; } int fuse_fs_fallocate(struct fuse_fs *fs, const char *path, int mode, off_t offset, off_t length, struct fuse_file_info *fi) { fuse_get_context()->private_data = fs->user_data; if (fs->op.fallocate) { if (fs->debug) fuse_log(FUSE_LOG_DEBUG, "fallocate %s mode %x, offset: %llu, length: %llu\n", path, mode, (unsigned long long) offset, (unsigned long long) length); return fs->op.fallocate(path, mode, offset, length, fi); } else return -ENOSYS; } ssize_t fuse_fs_copy_file_range(struct fuse_fs *fs, const char *path_in, struct fuse_file_info *fi_in, off_t off_in, const char *path_out, struct fuse_file_info *fi_out, off_t off_out, size_t len, int flags) { fuse_get_context()->private_data = fs->user_data; if (fs->op.copy_file_range) { if (fs->debug) fuse_log(FUSE_LOG_DEBUG, "copy_file_range from %s:%llu to " "%s:%llu, length: %llu\n", path_in, (unsigned long long) off_in, path_out, (unsigned long long) off_out, (unsigned long long) len); return fs->op.copy_file_range(path_in, fi_in, off_in, path_out, fi_out, off_out, len, flags); } else return -ENOSYS; } off_t fuse_fs_lseek(struct fuse_fs *fs, const char *path, off_t off, int whence, struct fuse_file_info *fi) { fuse_get_context()->private_data = fs->user_data; if (fs->op.lseek) { if (fs->debug) { char buf[10]; fuse_log(FUSE_LOG_DEBUG, "lseek[%s] %llu %d\n", file_info_string(fi, buf, sizeof(buf)), (unsigned long long) off, whence); } return fs->op.lseek(path, off, whence, fi); } else { return -ENOSYS; } } static int is_open(struct fuse *f, fuse_ino_t dir, const char *name) { struct node *node; int isopen = 0; pthread_mutex_lock(&f->lock); node = lookup_node(f, dir, name); if (node && node->open_count > 0) isopen = 1; pthread_mutex_unlock(&f->lock); return isopen; } static char *hidden_name(struct fuse *f, fuse_ino_t dir, const char *oldname, char *newname, size_t bufsize) { struct stat buf; struct node *node; struct node *newnode; char *newpath; int res; int failctr = 10; do { pthread_mutex_lock(&f->lock); node = lookup_node(f, dir, oldname); if (node == NULL) { pthread_mutex_unlock(&f->lock); return NULL; } do { f->hidectr ++; snprintf(newname, bufsize, ".fuse_hidden%08x%08x", (unsigned int) node->nodeid, f->hidectr); newnode = lookup_node(f, dir, newname); } while(newnode); res = try_get_path(f, dir, newname, &newpath, NULL, false); pthread_mutex_unlock(&f->lock); if (res) break; memset(&buf, 0, sizeof(buf)); res = fuse_fs_getattr(f->fs, newpath, &buf, NULL); if (res == -ENOENT) break; free(newpath); newpath = NULL; } while(res == 0 && --failctr); return newpath; } static int hide_node(struct fuse *f, const char *oldpath, fuse_ino_t dir, const char *oldname) { char newname[64]; char *newpath; int err = -EBUSY; newpath = hidden_name(f, dir, oldname, newname, sizeof(newname)); if (newpath) { err = fuse_fs_rename(f->fs, oldpath, newpath, 0); if (!err) err = rename_node(f, dir, oldname, dir, newname, 1); free(newpath); } return err; } static int mtime_eq(const struct stat *stbuf, const struct timespec *ts) { return stbuf->st_mtime == ts->tv_sec && ST_MTIM_NSEC(stbuf) == ts->tv_nsec; } #ifndef CLOCK_MONOTONIC #define CLOCK_MONOTONIC CLOCK_REALTIME #endif static void curr_time(struct timespec *now) { static clockid_t clockid = CLOCK_MONOTONIC; int res = clock_gettime(clockid, now); if (res == -1 && errno == EINVAL) { clockid = CLOCK_REALTIME; res = clock_gettime(clockid, now); } if (res == -1) { perror("fuse: clock_gettime"); abort(); } } static void update_stat(struct node *node, const struct stat *stbuf) { if (node->cache_valid && (!mtime_eq(stbuf, &node->mtime) || stbuf->st_size != node->size)) node->cache_valid = 0; node->mtime.tv_sec = stbuf->st_mtime; node->mtime.tv_nsec = ST_MTIM_NSEC(stbuf); node->size = stbuf->st_size; curr_time(&node->stat_updated); } static int do_lookup(struct fuse *f, fuse_ino_t nodeid, const char *name, struct fuse_entry_param *e) { struct node *node; node = find_node(f, nodeid, name); if (node == NULL) return -ENOMEM; e->ino = node->nodeid; e->generation = node->generation; e->entry_timeout = f->conf.entry_timeout; e->attr_timeout = f->conf.attr_timeout; if (f->conf.auto_cache) { pthread_mutex_lock(&f->lock); update_stat(node, &e->attr); pthread_mutex_unlock(&f->lock); } set_stat(f, e->ino, &e->attr); return 0; } static int lookup_path(struct fuse *f, fuse_ino_t nodeid, const char *name, const char *path, struct fuse_entry_param *e, struct fuse_file_info *fi) { int res; memset(e, 0, sizeof(struct fuse_entry_param)); res = fuse_fs_getattr(f->fs, path, &e->attr, fi); if (res == 0) { res = do_lookup(f, nodeid, name, e); if (res == 0 && f->conf.debug) { fuse_log(FUSE_LOG_DEBUG, " NODEID: %llu\n", (unsigned long long) e->ino); } } return res; } static struct fuse_context_i *fuse_get_context_internal(void) { return (struct fuse_context_i *) pthread_getspecific(fuse_context_key); } static struct fuse_context_i *fuse_create_context(struct fuse *f) { struct fuse_context_i *c = fuse_get_context_internal(); if (c == NULL) { c = (struct fuse_context_i *) calloc(1, sizeof(struct fuse_context_i)); if (c == NULL) { /* This is hard to deal with properly, so just abort. If memory is so low that the context cannot be allocated, there's not much hope for the filesystem anyway */ fuse_log(FUSE_LOG_ERR, "fuse: failed to allocate thread specific data\n"); abort(); } pthread_setspecific(fuse_context_key, c); } else { memset(c, 0, sizeof(*c)); } c->ctx.fuse = f; return c; } static void fuse_freecontext(void *data) { free(data); } static int fuse_create_context_key(void) { int err = 0; pthread_mutex_lock(&fuse_context_lock); if (!fuse_context_ref) { err = pthread_key_create(&fuse_context_key, fuse_freecontext); if (err) { fuse_log(FUSE_LOG_ERR, "fuse: failed to create thread specific key: %s\n", strerror(err)); pthread_mutex_unlock(&fuse_context_lock); return -1; } } fuse_context_ref++; pthread_mutex_unlock(&fuse_context_lock); return 0; } static void fuse_delete_context_key(void) { pthread_mutex_lock(&fuse_context_lock); fuse_context_ref--; if (!fuse_context_ref) { free(pthread_getspecific(fuse_context_key)); pthread_key_delete(fuse_context_key); } pthread_mutex_unlock(&fuse_context_lock); } static struct fuse *req_fuse_prepare(fuse_req_t req) { struct fuse_context_i *c = fuse_create_context(req_fuse(req)); const struct fuse_ctx *ctx = fuse_req_ctx(req); c->req = req; c->ctx.uid = ctx->uid; c->ctx.gid = ctx->gid; c->ctx.pid = ctx->pid; c->ctx.umask = ctx->umask; return c->ctx.fuse; } static inline void reply_err(fuse_req_t req, int err) { /* fuse_reply_err() uses non-negated errno values */ fuse_reply_err(req, -err); } static void reply_entry(fuse_req_t req, const struct fuse_entry_param *e, int err) { if (!err) { struct fuse *f = req_fuse(req); if (fuse_reply_entry(req, e) == -ENOENT) { /* Skip forget for negative result */ if (e->ino != 0) forget_node(f, e->ino, 1); } } else reply_err(req, err); } void fuse_fs_init(struct fuse_fs *fs, struct fuse_conn_info *conn, struct fuse_config *cfg) { fuse_get_context()->private_data = fs->user_data; if (!fs->op.write_buf) conn->want &= ~FUSE_CAP_SPLICE_READ; if (!fs->op.lock) conn->want &= ~FUSE_CAP_POSIX_LOCKS; if (!fs->op.flock) conn->want &= ~FUSE_CAP_FLOCK_LOCKS; if (fs->op.init) fs->user_data = fs->op.init(conn, cfg); } static void fuse_lib_init(void *data, struct fuse_conn_info *conn) { struct fuse *f = (struct fuse *) data; fuse_create_context(f); if(conn->capable & FUSE_CAP_EXPORT_SUPPORT) conn->want |= FUSE_CAP_EXPORT_SUPPORT; fuse_fs_init(f->fs, conn, &f->conf); } void fuse_fs_destroy(struct fuse_fs *fs) { fuse_get_context()->private_data = fs->user_data; if (fs->op.destroy) fs->op.destroy(fs->user_data); } static void fuse_lib_destroy(void *data) { struct fuse *f = (struct fuse *) data; fuse_create_context(f); fuse_fs_destroy(f->fs); } static void fuse_lib_lookup(fuse_req_t req, fuse_ino_t parent, const char *name) { struct fuse *f = req_fuse_prepare(req); struct fuse_entry_param e; char *path; int err; struct node *dot = NULL; if (name[0] == '.') { int len = strlen(name); if (len == 1 || (name[1] == '.' && len == 2)) { pthread_mutex_lock(&f->lock); if (len == 1) { if (f->conf.debug) fuse_log(FUSE_LOG_DEBUG, "LOOKUP-DOT\n"); dot = get_node_nocheck(f, parent); if (dot == NULL) { pthread_mutex_unlock(&f->lock); reply_entry(req, &e, -ESTALE); return; } dot->refctr++; } else { if (f->conf.debug) fuse_log(FUSE_LOG_DEBUG, "LOOKUP-DOTDOT\n"); parent = get_node(f, parent)->parent->nodeid; } pthread_mutex_unlock(&f->lock); name = NULL; } } err = get_path_name(f, parent, name, &path); if (!err) { struct fuse_intr_data d; if (f->conf.debug) fuse_log(FUSE_LOG_DEBUG, "LOOKUP %s\n", path); fuse_prepare_interrupt(f, req, &d); err = lookup_path(f, parent, name, path, &e, NULL); if (err == -ENOENT && f->conf.negative_timeout != 0.0) { e.ino = 0; e.entry_timeout = f->conf.negative_timeout; err = 0; } fuse_finish_interrupt(f, req, &d); free_path(f, parent, path); } if (dot) { pthread_mutex_lock(&f->lock); unref_node(f, dot); pthread_mutex_unlock(&f->lock); } reply_entry(req, &e, err); } static void do_forget(struct fuse *f, fuse_ino_t ino, uint64_t nlookup) { if (f->conf.debug) fuse_log(FUSE_LOG_DEBUG, "FORGET %llu/%llu\n", (unsigned long long)ino, (unsigned long long) nlookup); forget_node(f, ino, nlookup); } static void fuse_lib_forget(fuse_req_t req, fuse_ino_t ino, uint64_t nlookup) { do_forget(req_fuse(req), ino, nlookup); fuse_reply_none(req); } static void fuse_lib_forget_multi(fuse_req_t req, size_t count, struct fuse_forget_data *forgets) { struct fuse *f = req_fuse(req); size_t i; for (i = 0; i < count; i++) do_forget(f, forgets[i].ino, forgets[i].nlookup); fuse_reply_none(req); } static void fuse_lib_getattr(fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi) { struct fuse *f = req_fuse_prepare(req); struct stat buf; char *path; int err; memset(&buf, 0, sizeof(buf)); if (fi != NULL) err = get_path_nullok(f, ino, &path); else err = get_path(f, ino, &path); if (!err) { struct fuse_intr_data d; fuse_prepare_interrupt(f, req, &d); err = fuse_fs_getattr(f->fs, path, &buf, fi); fuse_finish_interrupt(f, req, &d); free_path(f, ino, path); } if (!err) { struct node *node; pthread_mutex_lock(&f->lock); node = get_node(f, ino); if (node->is_hidden && buf.st_nlink > 0) buf.st_nlink--; if (f->conf.auto_cache) update_stat(node, &buf); pthread_mutex_unlock(&f->lock); set_stat(f, ino, &buf); fuse_reply_attr(req, &buf, f->conf.attr_timeout); } else reply_err(req, err); } int fuse_fs_chmod(struct fuse_fs *fs, const char *path, mode_t mode, struct fuse_file_info *fi) { fuse_get_context()->private_data = fs->user_data; if (fs->op.chmod) { if (fs->debug) { char buf[10]; fuse_log(FUSE_LOG_DEBUG, "chmod[%s] %s %llo\n", file_info_string(fi, buf, sizeof(buf)), path, (unsigned long long) mode); } return fs->op.chmod(path, mode, fi); } else return -ENOSYS; } static void fuse_lib_setattr(fuse_req_t req, fuse_ino_t ino, struct stat *attr, int valid, struct fuse_file_info *fi) { struct fuse *f = req_fuse_prepare(req); struct stat buf; char *path; int err; memset(&buf, 0, sizeof(buf)); if (fi != NULL) err = get_path_nullok(f, ino, &path); else err = get_path(f, ino, &path); if (!err) { struct fuse_intr_data d; fuse_prepare_interrupt(f, req, &d); err = 0; if (!err && (valid & FUSE_SET_ATTR_MODE)) err = fuse_fs_chmod(f->fs, path, attr->st_mode, fi); if (!err && (valid & (FUSE_SET_ATTR_UID | FUSE_SET_ATTR_GID))) { uid_t uid = (valid & FUSE_SET_ATTR_UID) ? attr->st_uid : (uid_t) -1; gid_t gid = (valid & FUSE_SET_ATTR_GID) ? attr->st_gid : (gid_t) -1; err = fuse_fs_chown(f->fs, path, uid, gid, fi); } if (!err && (valid & FUSE_SET_ATTR_SIZE)) { err = fuse_fs_truncate(f->fs, path, attr->st_size, fi); } #ifdef HAVE_UTIMENSAT if (!err && (valid & (FUSE_SET_ATTR_ATIME | FUSE_SET_ATTR_MTIME))) { struct timespec tv[2]; tv[0].tv_sec = 0; tv[1].tv_sec = 0; tv[0].tv_nsec = UTIME_OMIT; tv[1].tv_nsec = UTIME_OMIT; if (valid & FUSE_SET_ATTR_ATIME_NOW) tv[0].tv_nsec = UTIME_NOW; else if (valid & FUSE_SET_ATTR_ATIME) tv[0] = attr->st_atim; if (valid & FUSE_SET_ATTR_MTIME_NOW) tv[1].tv_nsec = UTIME_NOW; else if (valid & FUSE_SET_ATTR_MTIME) tv[1] = attr->st_mtim; err = fuse_fs_utimens(f->fs, path, tv, fi); } else #endif if (!err && (valid & (FUSE_SET_ATTR_ATIME | FUSE_SET_ATTR_MTIME)) == (FUSE_SET_ATTR_ATIME | FUSE_SET_ATTR_MTIME)) { struct timespec tv[2]; tv[0].tv_sec = attr->st_atime; tv[0].tv_nsec = ST_ATIM_NSEC(attr); tv[1].tv_sec = attr->st_mtime; tv[1].tv_nsec = ST_MTIM_NSEC(attr); err = fuse_fs_utimens(f->fs, path, tv, fi); } if (!err) { err = fuse_fs_getattr(f->fs, path, &buf, fi); } fuse_finish_interrupt(f, req, &d); free_path(f, ino, path); } if (!err) { if (f->conf.auto_cache) { pthread_mutex_lock(&f->lock); update_stat(get_node(f, ino), &buf); pthread_mutex_unlock(&f->lock); } set_stat(f, ino, &buf); fuse_reply_attr(req, &buf, f->conf.attr_timeout); } else reply_err(req, err); } static void fuse_lib_access(fuse_req_t req, fuse_ino_t ino, int mask) { struct fuse *f = req_fuse_prepare(req); char *path; int err; err = get_path(f, ino, &path); if (!err) { struct fuse_intr_data d; fuse_prepare_interrupt(f, req, &d); err = fuse_fs_access(f->fs, path, mask); fuse_finish_interrupt(f, req, &d); free_path(f, ino, path); } reply_err(req, err); } static void fuse_lib_readlink(fuse_req_t req, fuse_ino_t ino) { struct fuse *f = req_fuse_prepare(req); char linkname[PATH_MAX + 1]; char *path; int err; err = get_path(f, ino, &path); if (!err) { struct fuse_intr_data d; fuse_prepare_interrupt(f, req, &d); err = fuse_fs_readlink(f->fs, path, linkname, sizeof(linkname)); fuse_finish_interrupt(f, req, &d); free_path(f, ino, path); } if (!err) { linkname[PATH_MAX] = '\0'; fuse_reply_readlink(req, linkname); } else reply_err(req, err); } static void fuse_lib_mknod(fuse_req_t req, fuse_ino_t parent, const char *name, mode_t mode, dev_t rdev) { struct fuse *f = req_fuse_prepare(req); struct fuse_entry_param e; char *path; int err; err = get_path_name(f, parent, name, &path); if (!err) { struct fuse_intr_data d; fuse_prepare_interrupt(f, req, &d); err = -ENOSYS; if (S_ISREG(mode)) { struct fuse_file_info fi; memset(&fi, 0, sizeof(fi)); fi.flags = O_CREAT | O_EXCL | O_WRONLY; err = fuse_fs_create(f->fs, path, mode, &fi); if (!err) { err = lookup_path(f, parent, name, path, &e, &fi); fuse_fs_release(f->fs, path, &fi); } } if (err == -ENOSYS) { err = fuse_fs_mknod(f->fs, path, mode, rdev); if (!err) err = lookup_path(f, parent, name, path, &e, NULL); } fuse_finish_interrupt(f, req, &d); free_path(f, parent, path); } reply_entry(req, &e, err); } static void fuse_lib_mkdir(fuse_req_t req, fuse_ino_t parent, const char *name, mode_t mode) { struct fuse *f = req_fuse_prepare(req); struct fuse_entry_param e; char *path; int err; err = get_path_name(f, parent, name, &path); if (!err) { struct fuse_intr_data d; fuse_prepare_interrupt(f, req, &d); err = fuse_fs_mkdir(f->fs, path, mode); if (!err) err = lookup_path(f, parent, name, path, &e, NULL); fuse_finish_interrupt(f, req, &d); free_path(f, parent, path); } reply_entry(req, &e, err); } static void fuse_lib_unlink(fuse_req_t req, fuse_ino_t parent, const char *name) { struct fuse *f = req_fuse_prepare(req); struct node *wnode; char *path; int err; err = get_path_wrlock(f, parent, name, &path, &wnode); if (!err) { struct fuse_intr_data d; fuse_prepare_interrupt(f, req, &d); if (!f->conf.hard_remove && is_open(f, parent, name)) { err = hide_node(f, path, parent, name); if (!err) { /* we have hidden the node so now check again under a lock in case it is not used any more */ if (!is_open(f, parent, wnode->name)) { char *unlinkpath; /* get the hidden file path, to unlink it */ if (try_get_path(f, wnode->nodeid, NULL, &unlinkpath, NULL, false) == 0) { err = fuse_fs_unlink(f->fs, unlinkpath); if (!err) remove_node(f, parent, wnode->name); free(unlinkpath); } } } } else { err = fuse_fs_unlink(f->fs, path); if (!err) remove_node(f, parent, name); } fuse_finish_interrupt(f, req, &d); free_path_wrlock(f, parent, wnode, path); } reply_err(req, err); } static void fuse_lib_rmdir(fuse_req_t req, fuse_ino_t parent, const char *name) { struct fuse *f = req_fuse_prepare(req); struct node *wnode; char *path; int err; err = get_path_wrlock(f, parent, name, &path, &wnode); if (!err) { struct fuse_intr_data d; fuse_prepare_interrupt(f, req, &d); err = fuse_fs_rmdir(f->fs, path); fuse_finish_interrupt(f, req, &d); if (!err) remove_node(f, parent, name); free_path_wrlock(f, parent, wnode, path); } reply_err(req, err); } static void fuse_lib_symlink(fuse_req_t req, const char *linkname, fuse_ino_t parent, const char *name) { struct fuse *f = req_fuse_prepare(req); struct fuse_entry_param e; char *path; int err; err = get_path_name(f, parent, name, &path); if (!err) { struct fuse_intr_data d; fuse_prepare_interrupt(f, req, &d); err = fuse_fs_symlink(f->fs, linkname, path); if (!err) err = lookup_path(f, parent, name, path, &e, NULL); fuse_finish_interrupt(f, req, &d); free_path(f, parent, path); } reply_entry(req, &e, err); } static void fuse_lib_rename(fuse_req_t req, fuse_ino_t olddir, const char *oldname, fuse_ino_t newdir, const char *newname, unsigned int flags) { struct fuse *f = req_fuse_prepare(req); char *oldpath; char *newpath; struct node *wnode1; struct node *wnode2; int err; err = get_path2(f, olddir, oldname, newdir, newname, &oldpath, &newpath, &wnode1, &wnode2); if (!err) { struct fuse_intr_data d; err = 0; fuse_prepare_interrupt(f, req, &d); if (!f->conf.hard_remove && !(flags & RENAME_EXCHANGE) && is_open(f, newdir, newname)) err = hide_node(f, newpath, newdir, newname); if (!err) { err = fuse_fs_rename(f->fs, oldpath, newpath, flags); if (!err) { if (flags & RENAME_EXCHANGE) { err = exchange_node(f, olddir, oldname, newdir, newname); } else { err = rename_node(f, olddir, oldname, newdir, newname, 0); } } } fuse_finish_interrupt(f, req, &d); free_path2(f, olddir, newdir, wnode1, wnode2, oldpath, newpath); } reply_err(req, err); } static void fuse_lib_link(fuse_req_t req, fuse_ino_t ino, fuse_ino_t newparent, const char *newname) { struct fuse *f = req_fuse_prepare(req); struct fuse_entry_param e; char *oldpath; char *newpath; int err; err = get_path2(f, ino, NULL, newparent, newname, &oldpath, &newpath, NULL, NULL); if (!err) { struct fuse_intr_data d; fuse_prepare_interrupt(f, req, &d); err = fuse_fs_link(f->fs, oldpath, newpath); if (!err) err = lookup_path(f, newparent, newname, newpath, &e, NULL); fuse_finish_interrupt(f, req, &d); free_path2(f, ino, newparent, NULL, NULL, oldpath, newpath); } reply_entry(req, &e, err); } static void fuse_do_release(struct fuse *f, fuse_ino_t ino, const char *path, struct fuse_file_info *fi) { struct node *node; int unlink_hidden = 0; fuse_fs_release(f->fs, path, fi); pthread_mutex_lock(&f->lock); node = get_node(f, ino); assert(node->open_count > 0); --node->open_count; if (node->is_hidden && !node->open_count) { unlink_hidden = 1; node->is_hidden = 0; } pthread_mutex_unlock(&f->lock); if(unlink_hidden) { if (path) { fuse_fs_unlink(f->fs, path); } else if (f->conf.nullpath_ok) { char *unlinkpath; if (get_path(f, ino, &unlinkpath) == 0) fuse_fs_unlink(f->fs, unlinkpath); free_path(f, ino, unlinkpath); } } } static void fuse_lib_create(fuse_req_t req, fuse_ino_t parent, const char *name, mode_t mode, struct fuse_file_info *fi) { struct fuse *f = req_fuse_prepare(req); struct fuse_intr_data d; struct fuse_entry_param e; char *path; int err; err = get_path_name(f, parent, name, &path); if (!err) { fuse_prepare_interrupt(f, req, &d); err = fuse_fs_create(f->fs, path, mode, fi); if (!err) { err = lookup_path(f, parent, name, path, &e, fi); if (err) fuse_fs_release(f->fs, path, fi); else if (!S_ISREG(e.attr.st_mode)) { err = -EIO; fuse_fs_release(f->fs, path, fi); forget_node(f, e.ino, 1); } else { if (f->conf.direct_io) fi->direct_io = 1; if (f->conf.kernel_cache) fi->keep_cache = 1; if (fi->direct_io && f->conf.parallel_direct_writes) fi->parallel_direct_writes = 1; } } fuse_finish_interrupt(f, req, &d); } if (!err) { pthread_mutex_lock(&f->lock); get_node(f, e.ino)->open_count++; pthread_mutex_unlock(&f->lock); if (fuse_reply_create(req, &e, fi) == -ENOENT) { /* The open syscall was interrupted, so it must be cancelled */ fuse_do_release(f, e.ino, path, fi); forget_node(f, e.ino, 1); } } else { reply_err(req, err); } free_path(f, parent, path); } static double diff_timespec(const struct timespec *t1, const struct timespec *t2) { return (t1->tv_sec - t2->tv_sec) + ((double) t1->tv_nsec - (double) t2->tv_nsec) / 1000000000.0; } static void open_auto_cache(struct fuse *f, fuse_ino_t ino, const char *path, struct fuse_file_info *fi) { struct node *node; pthread_mutex_lock(&f->lock); node = get_node(f, ino); if (node->cache_valid) { struct timespec now; curr_time(&now); if (diff_timespec(&now, &node->stat_updated) > f->conf.ac_attr_timeout) { struct stat stbuf; int err; pthread_mutex_unlock(&f->lock); err = fuse_fs_getattr(f->fs, path, &stbuf, fi); pthread_mutex_lock(&f->lock); if (!err) update_stat(node, &stbuf); else node->cache_valid = 0; } } if (node->cache_valid) fi->keep_cache = 1; node->cache_valid = 1; pthread_mutex_unlock(&f->lock); } static void fuse_lib_open(fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi) { struct fuse *f = req_fuse_prepare(req); struct fuse_intr_data d; char *path; int err; err = get_path(f, ino, &path); if (!err) { fuse_prepare_interrupt(f, req, &d); err = fuse_fs_open(f->fs, path, fi); if (!err) { if (f->conf.direct_io) fi->direct_io = 1; if (f->conf.kernel_cache) fi->keep_cache = 1; if (f->conf.auto_cache) open_auto_cache(f, ino, path, fi); if (f->conf.no_rofd_flush && (fi->flags & O_ACCMODE) == O_RDONLY) fi->noflush = 1; if (fi->direct_io && f->conf.parallel_direct_writes) fi->parallel_direct_writes = 1; } fuse_finish_interrupt(f, req, &d); } if (!err) { pthread_mutex_lock(&f->lock); get_node(f, ino)->open_count++; pthread_mutex_unlock(&f->lock); if (fuse_reply_open(req, fi) == -ENOENT) { /* The open syscall was interrupted, so it must be cancelled */ fuse_do_release(f, ino, path, fi); } } else reply_err(req, err); free_path(f, ino, path); } static void fuse_lib_read(fuse_req_t req, fuse_ino_t ino, size_t size, off_t off, struct fuse_file_info *fi) { struct fuse *f = req_fuse_prepare(req); struct fuse_bufvec *buf = NULL; char *path; int res; res = get_path_nullok(f, ino, &path); if (res == 0) { struct fuse_intr_data d; fuse_prepare_interrupt(f, req, &d); res = fuse_fs_read_buf(f->fs, path, &buf, size, off, fi); fuse_finish_interrupt(f, req, &d); free_path(f, ino, path); } if (res == 0) fuse_reply_data(req, buf, FUSE_BUF_SPLICE_MOVE); else reply_err(req, res); fuse_free_buf(buf); } static void fuse_lib_write_buf(fuse_req_t req, fuse_ino_t ino, struct fuse_bufvec *buf, off_t off, struct fuse_file_info *fi) { struct fuse *f = req_fuse_prepare(req); char *path; int res; res = get_path_nullok(f, ino, &path); if (res == 0) { struct fuse_intr_data d; fuse_prepare_interrupt(f, req, &d); res = fuse_fs_write_buf(f->fs, path, buf, off, fi); fuse_finish_interrupt(f, req, &d); free_path(f, ino, path); } if (res >= 0) fuse_reply_write(req, res); else reply_err(req, res); } static void fuse_lib_fsync(fuse_req_t req, fuse_ino_t ino, int datasync, struct fuse_file_info *fi) { struct fuse *f = req_fuse_prepare(req); char *path; int err; err = get_path_nullok(f, ino, &path); if (!err) { struct fuse_intr_data d; fuse_prepare_interrupt(f, req, &d); err = fuse_fs_fsync(f->fs, path, datasync, fi); fuse_finish_interrupt(f, req, &d); free_path(f, ino, path); } reply_err(req, err); } static struct fuse_dh *get_dirhandle(const struct fuse_file_info *llfi, struct fuse_file_info *fi) { struct fuse_dh *dh = (struct fuse_dh *) (uintptr_t) llfi->fh; memset(fi, 0, sizeof(struct fuse_file_info)); fi->fh = dh->fh; return dh; } static void fuse_lib_opendir(fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *llfi) { struct fuse *f = req_fuse_prepare(req); struct fuse_intr_data d; struct fuse_dh *dh; struct fuse_file_info fi; char *path; int err; dh = (struct fuse_dh *) malloc(sizeof(struct fuse_dh)); if (dh == NULL) { reply_err(req, -ENOMEM); return; } memset(dh, 0, sizeof(struct fuse_dh)); dh->fuse = f; dh->contents = NULL; dh->first = NULL; dh->len = 0; dh->filled = 0; dh->nodeid = ino; pthread_mutex_init(&dh->lock, NULL); llfi->fh = (uintptr_t) dh; memset(&fi, 0, sizeof(fi)); fi.flags = llfi->flags; err = get_path(f, ino, &path); if (!err) { fuse_prepare_interrupt(f, req, &d); err = fuse_fs_opendir(f->fs, path, &fi); fuse_finish_interrupt(f, req, &d); dh->fh = fi.fh; llfi->cache_readdir = fi.cache_readdir; llfi->keep_cache = fi.keep_cache; } if (!err) { if (fuse_reply_open(req, llfi) == -ENOENT) { /* The opendir syscall was interrupted, so it must be cancelled */ fuse_fs_releasedir(f->fs, path, &fi); pthread_mutex_destroy(&dh->lock); free(dh); } } else { reply_err(req, err); pthread_mutex_destroy(&dh->lock); free(dh); } free_path(f, ino, path); } static int extend_contents(struct fuse_dh *dh, unsigned minsize) { if (minsize > dh->size) { char *newptr; unsigned newsize = dh->size; if (!newsize) newsize = 1024; while (newsize < minsize) { if (newsize >= 0x80000000) newsize = 0xffffffff; else newsize *= 2; } newptr = (char *) realloc(dh->contents, newsize); if (!newptr) { dh->error = -ENOMEM; return -1; } dh->contents = newptr; dh->size = newsize; } return 0; } static int fuse_add_direntry_to_dh(struct fuse_dh *dh, const char *name, struct stat *st) { struct fuse_direntry *de; de = malloc(sizeof(struct fuse_direntry)); if (!de) { dh->error = -ENOMEM; return -1; } de->name = strdup(name); if (!de->name) { dh->error = -ENOMEM; free(de); return -1; } de->stat = *st; de->next = NULL; *dh->last = de; dh->last = &de->next; return 0; } static fuse_ino_t lookup_nodeid(struct fuse *f, fuse_ino_t parent, const char *name) { struct node *node; fuse_ino_t res = FUSE_UNKNOWN_INO; pthread_mutex_lock(&f->lock); node = lookup_node(f, parent, name); if (node) res = node->nodeid; pthread_mutex_unlock(&f->lock); return res; } static int fill_dir(void *dh_, const char *name, const struct stat *statp, off_t off, enum fuse_fill_dir_flags flags) { struct fuse_dh *dh = (struct fuse_dh *) dh_; struct stat stbuf; if ((flags & ~FUSE_FILL_DIR_PLUS) != 0) { dh->error = -EIO; return 1; } if (statp) stbuf = *statp; else { memset(&stbuf, 0, sizeof(stbuf)); stbuf.st_ino = FUSE_UNKNOWN_INO; } if (!dh->fuse->conf.use_ino) { stbuf.st_ino = FUSE_UNKNOWN_INO; if (dh->fuse->conf.readdir_ino) { stbuf.st_ino = (ino_t) lookup_nodeid(dh->fuse, dh->nodeid, name); } } if (off) { size_t newlen; if (dh->filled) { dh->error = -EIO; return 1; } if (dh->first) { dh->error = -EIO; return 1; } if (extend_contents(dh, dh->needlen) == -1) return 1; newlen = dh->len + fuse_add_direntry(dh->req, dh->contents + dh->len, dh->needlen - dh->len, name, &stbuf, off); if (newlen > dh->needlen) return 1; dh->len = newlen; } else { dh->filled = 1; if (fuse_add_direntry_to_dh(dh, name, &stbuf) == -1) return 1; } return 0; } static int is_dot_or_dotdot(const char *name) { return name[0] == '.' && (name[1] == '\0' || (name[1] == '.' && name[2] == '\0')); } static int fill_dir_plus(void *dh_, const char *name, const struct stat *statp, off_t off, enum fuse_fill_dir_flags flags) { struct fuse_dh *dh = (struct fuse_dh *) dh_; struct fuse_entry_param e = { /* ino=0 tells the kernel to ignore readdirplus stat info */ .ino = 0, }; struct fuse *f = dh->fuse; int res; if ((flags & ~FUSE_FILL_DIR_PLUS) != 0) { dh->error = -EIO; return 1; } if (statp && (flags & FUSE_FILL_DIR_PLUS)) { e.attr = *statp; } else { e.attr.st_ino = FUSE_UNKNOWN_INO; if (statp) { e.attr.st_mode = statp->st_mode; if (f->conf.use_ino) e.attr.st_ino = statp->st_ino; } if (!f->conf.use_ino && f->conf.readdir_ino) { e.attr.st_ino = (ino_t) lookup_nodeid(f, dh->nodeid, name); } } if (off) { size_t newlen; if (dh->filled) { dh->error = -EIO; return 1; } if (dh->first) { dh->error = -EIO; return 1; } if (extend_contents(dh, dh->needlen) == -1) return 1; if (statp && (flags & FUSE_FILL_DIR_PLUS)) { if (!is_dot_or_dotdot(name)) { res = do_lookup(f, dh->nodeid, name, &e); if (res) { dh->error = res; return 1; } } } newlen = dh->len + fuse_add_direntry_plus(dh->req, dh->contents + dh->len, dh->needlen - dh->len, name, &e, off); if (newlen > dh->needlen) return 1; dh->len = newlen; } else { dh->filled = 1; if (fuse_add_direntry_to_dh(dh, name, &e.attr) == -1) return 1; } return 0; } static void free_direntries(struct fuse_direntry *de) { while (de) { struct fuse_direntry *next = de->next; free(de->name); free(de); de = next; } } static int readdir_fill(struct fuse *f, fuse_req_t req, fuse_ino_t ino, size_t size, off_t off, struct fuse_dh *dh, struct fuse_file_info *fi, enum fuse_readdir_flags flags) { char *path; int err; if (f->fs->op.readdir) err = get_path_nullok(f, ino, &path); else err = get_path(f, ino, &path); if (!err) { struct fuse_intr_data d; fuse_fill_dir_t filler = fill_dir; if (flags & FUSE_READDIR_PLUS) filler = fill_dir_plus; free_direntries(dh->first); dh->first = NULL; dh->last = &dh->first; dh->len = 0; dh->error = 0; dh->needlen = size; dh->filled = 0; dh->req = req; fuse_prepare_interrupt(f, req, &d); err = fuse_fs_readdir(f->fs, path, dh, filler, off, fi, flags); fuse_finish_interrupt(f, req, &d); dh->req = NULL; if (!err) err = dh->error; if (err) dh->filled = 0; free_path(f, ino, path); } return err; } static int readdir_fill_from_list(fuse_req_t req, struct fuse_dh *dh, off_t off, enum fuse_readdir_flags flags) { off_t pos; struct fuse_direntry *de = dh->first; int res; dh->len = 0; if (extend_contents(dh, dh->needlen) == -1) return dh->error; for (pos = 0; pos < off; pos++) { if (!de) break; de = de->next; } while (de) { char *p = dh->contents + dh->len; unsigned rem = dh->needlen - dh->len; unsigned thislen; unsigned newlen; pos++; if (flags & FUSE_READDIR_PLUS) { struct fuse_entry_param e = { .ino = 0, .attr = de->stat, }; if (!is_dot_or_dotdot(de->name)) { res = do_lookup(dh->fuse, dh->nodeid, de->name, &e); if (res) { dh->error = res; return 1; } } thislen = fuse_add_direntry_plus(req, p, rem, de->name, &e, pos); } else { thislen = fuse_add_direntry(req, p, rem, de->name, &de->stat, pos); } newlen = dh->len + thislen; if (newlen > dh->needlen) break; dh->len = newlen; de = de->next; } return 0; } static void fuse_readdir_common(fuse_req_t req, fuse_ino_t ino, size_t size, off_t off, struct fuse_file_info *llfi, enum fuse_readdir_flags flags) { struct fuse *f = req_fuse_prepare(req); struct fuse_file_info fi; struct fuse_dh *dh = get_dirhandle(llfi, &fi); int err; pthread_mutex_lock(&dh->lock); /* According to SUS, directory contents need to be refreshed on rewinddir() */ if (!off) dh->filled = 0; if (!dh->filled) { err = readdir_fill(f, req, ino, size, off, dh, &fi, flags); if (err) { reply_err(req, err); goto out; } } if (dh->filled) { dh->needlen = size; err = readdir_fill_from_list(req, dh, off, flags); if (err) { reply_err(req, err); goto out; } } fuse_reply_buf(req, dh->contents, dh->len); out: pthread_mutex_unlock(&dh->lock); } static void fuse_lib_readdir(fuse_req_t req, fuse_ino_t ino, size_t size, off_t off, struct fuse_file_info *llfi) { fuse_readdir_common(req, ino, size, off, llfi, 0); } static void fuse_lib_readdirplus(fuse_req_t req, fuse_ino_t ino, size_t size, off_t off, struct fuse_file_info *llfi) { fuse_readdir_common(req, ino, size, off, llfi, FUSE_READDIR_PLUS); } static void fuse_lib_releasedir(fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *llfi) { struct fuse *f = req_fuse_prepare(req); struct fuse_intr_data d; struct fuse_file_info fi; struct fuse_dh *dh = get_dirhandle(llfi, &fi); char *path; get_path_nullok(f, ino, &path); fuse_prepare_interrupt(f, req, &d); fuse_fs_releasedir(f->fs, path, &fi); fuse_finish_interrupt(f, req, &d); free_path(f, ino, path); pthread_mutex_lock(&dh->lock); pthread_mutex_unlock(&dh->lock); pthread_mutex_destroy(&dh->lock); free_direntries(dh->first); free(dh->contents); free(dh); reply_err(req, 0); } static void fuse_lib_fsyncdir(fuse_req_t req, fuse_ino_t ino, int datasync, struct fuse_file_info *llfi) { struct fuse *f = req_fuse_prepare(req); struct fuse_file_info fi; char *path; int err; get_dirhandle(llfi, &fi); err = get_path_nullok(f, ino, &path); if (!err) { struct fuse_intr_data d; fuse_prepare_interrupt(f, req, &d); err = fuse_fs_fsyncdir(f->fs, path, datasync, &fi); fuse_finish_interrupt(f, req, &d); free_path(f, ino, path); } reply_err(req, err); } static void fuse_lib_statfs(fuse_req_t req, fuse_ino_t ino) { struct fuse *f = req_fuse_prepare(req); struct statvfs buf; char *path = NULL; int err = 0; memset(&buf, 0, sizeof(buf)); if (ino) err = get_path(f, ino, &path); if (!err) { struct fuse_intr_data d; fuse_prepare_interrupt(f, req, &d); err = fuse_fs_statfs(f->fs, path ? path : "/", &buf); fuse_finish_interrupt(f, req, &d); free_path(f, ino, path); } if (!err) fuse_reply_statfs(req, &buf); else reply_err(req, err); } static void fuse_lib_setxattr(fuse_req_t req, fuse_ino_t ino, const char *name, const char *value, size_t size, int flags) { struct fuse *f = req_fuse_prepare(req); char *path; int err; err = get_path(f, ino, &path); if (!err) { struct fuse_intr_data d; fuse_prepare_interrupt(f, req, &d); err = fuse_fs_setxattr(f->fs, path, name, value, size, flags); fuse_finish_interrupt(f, req, &d); free_path(f, ino, path); } reply_err(req, err); } static int common_getxattr(struct fuse *f, fuse_req_t req, fuse_ino_t ino, const char *name, char *value, size_t size) { int err; char *path; err = get_path(f, ino, &path); if (!err) { struct fuse_intr_data d; fuse_prepare_interrupt(f, req, &d); err = fuse_fs_getxattr(f->fs, path, name, value, size); fuse_finish_interrupt(f, req, &d); free_path(f, ino, path); } return err; } static void fuse_lib_getxattr(fuse_req_t req, fuse_ino_t ino, const char *name, size_t size) { struct fuse *f = req_fuse_prepare(req); int res; if (size) { char *value = (char *) malloc(size); if (value == NULL) { reply_err(req, -ENOMEM); return; } res = common_getxattr(f, req, ino, name, value, size); if (res > 0) fuse_reply_buf(req, value, res); else reply_err(req, res); free(value); } else { res = common_getxattr(f, req, ino, name, NULL, 0); if (res >= 0) fuse_reply_xattr(req, res); else reply_err(req, res); } } static int common_listxattr(struct fuse *f, fuse_req_t req, fuse_ino_t ino, char *list, size_t size) { char *path; int err; err = get_path(f, ino, &path); if (!err) { struct fuse_intr_data d; fuse_prepare_interrupt(f, req, &d); err = fuse_fs_listxattr(f->fs, path, list, size); fuse_finish_interrupt(f, req, &d); free_path(f, ino, path); } return err; } static void fuse_lib_listxattr(fuse_req_t req, fuse_ino_t ino, size_t size) { struct fuse *f = req_fuse_prepare(req); int res; if (size) { char *list = (char *) malloc(size); if (list == NULL) { reply_err(req, -ENOMEM); return; } res = common_listxattr(f, req, ino, list, size); if (res > 0) fuse_reply_buf(req, list, res); else reply_err(req, res); free(list); } else { res = common_listxattr(f, req, ino, NULL, 0); if (res >= 0) fuse_reply_xattr(req, res); else reply_err(req, res); } } static void fuse_lib_removexattr(fuse_req_t req, fuse_ino_t ino, const char *name) { struct fuse *f = req_fuse_prepare(req); char *path; int err; err = get_path(f, ino, &path); if (!err) { struct fuse_intr_data d; fuse_prepare_interrupt(f, req, &d); err = fuse_fs_removexattr(f->fs, path, name); fuse_finish_interrupt(f, req, &d); free_path(f, ino, path); } reply_err(req, err); } static struct lock *locks_conflict(struct node *node, const struct lock *lock) { struct lock *l; for (l = node->locks; l; l = l->next) if (l->owner != lock->owner && lock->start <= l->end && l->start <= lock->end && (l->type == F_WRLCK || lock->type == F_WRLCK)) break; return l; } static void delete_lock(struct lock **lockp) { struct lock *l = *lockp; *lockp = l->next; free(l); } static void insert_lock(struct lock **pos, struct lock *lock) { lock->next = *pos; *pos = lock; } static int locks_insert(struct node *node, struct lock *lock) { struct lock **lp; struct lock *newl1 = NULL; struct lock *newl2 = NULL; if (lock->type != F_UNLCK || lock->start != 0 || lock->end != OFFSET_MAX) { newl1 = malloc(sizeof(struct lock)); newl2 = malloc(sizeof(struct lock)); if (!newl1 || !newl2) { free(newl1); free(newl2); return -ENOLCK; } } for (lp = &node->locks; *lp;) { struct lock *l = *lp; if (l->owner != lock->owner) goto skip; if (lock->type == l->type) { if (l->end < lock->start - 1) goto skip; if (lock->end < l->start - 1) break; if (l->start <= lock->start && lock->end <= l->end) goto out; if (l->start < lock->start) lock->start = l->start; if (lock->end < l->end) lock->end = l->end; goto delete; } else { if (l->end < lock->start) goto skip; if (lock->end < l->start) break; if (lock->start <= l->start && l->end <= lock->end) goto delete; if (l->end <= lock->end) { l->end = lock->start - 1; goto skip; } if (lock->start <= l->start) { l->start = lock->end + 1; break; } *newl2 = *l; newl2->start = lock->end + 1; l->end = lock->start - 1; insert_lock(&l->next, newl2); newl2 = NULL; } skip: lp = &l->next; continue; delete: delete_lock(lp); } if (lock->type != F_UNLCK) { *newl1 = *lock; insert_lock(lp, newl1); newl1 = NULL; } out: free(newl1); free(newl2); return 0; } static void flock_to_lock(struct flock *flock, struct lock *lock) { memset(lock, 0, sizeof(struct lock)); lock->type = flock->l_type; lock->start = flock->l_start; lock->end = flock->l_len ? flock->l_start + flock->l_len - 1 : OFFSET_MAX; lock->pid = flock->l_pid; } static void lock_to_flock(struct lock *lock, struct flock *flock) { flock->l_type = lock->type; flock->l_start = lock->start; flock->l_len = (lock->end == OFFSET_MAX) ? 0 : lock->end - lock->start + 1; flock->l_pid = lock->pid; } static int fuse_flush_common(struct fuse *f, fuse_req_t req, fuse_ino_t ino, const char *path, struct fuse_file_info *fi) { struct fuse_intr_data d; struct flock lock; struct lock l; int err; int errlock; fuse_prepare_interrupt(f, req, &d); memset(&lock, 0, sizeof(lock)); lock.l_type = F_UNLCK; lock.l_whence = SEEK_SET; err = fuse_fs_flush(f->fs, path, fi); errlock = fuse_fs_lock(f->fs, path, fi, F_SETLK, &lock); fuse_finish_interrupt(f, req, &d); if (errlock != -ENOSYS) { flock_to_lock(&lock, &l); l.owner = fi->lock_owner; pthread_mutex_lock(&f->lock); locks_insert(get_node(f, ino), &l); pthread_mutex_unlock(&f->lock); /* if op.lock() is defined FLUSH is needed regardless of op.flush() */ if (err == -ENOSYS) err = 0; } return err; } static void fuse_lib_release(fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi) { struct fuse *f = req_fuse_prepare(req); struct fuse_intr_data d; char *path; int err = 0; get_path_nullok(f, ino, &path); if (fi->flush) { err = fuse_flush_common(f, req, ino, path, fi); if (err == -ENOSYS) err = 0; } fuse_prepare_interrupt(f, req, &d); fuse_do_release(f, ino, path, fi); fuse_finish_interrupt(f, req, &d); free_path(f, ino, path); reply_err(req, err); } static void fuse_lib_flush(fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi) { struct fuse *f = req_fuse_prepare(req); char *path; int err; get_path_nullok(f, ino, &path); err = fuse_flush_common(f, req, ino, path, fi); free_path(f, ino, path); reply_err(req, err); } static int fuse_lock_common(fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi, struct flock *lock, int cmd) { struct fuse *f = req_fuse_prepare(req); char *path; int err; err = get_path_nullok(f, ino, &path); if (!err) { struct fuse_intr_data d; fuse_prepare_interrupt(f, req, &d); err = fuse_fs_lock(f->fs, path, fi, cmd, lock); fuse_finish_interrupt(f, req, &d); free_path(f, ino, path); } return err; } static void fuse_lib_getlk(fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi, struct flock *lock) { int err; struct lock l; struct lock *conflict; struct fuse *f = req_fuse(req); flock_to_lock(lock, &l); l.owner = fi->lock_owner; pthread_mutex_lock(&f->lock); conflict = locks_conflict(get_node(f, ino), &l); if (conflict) lock_to_flock(conflict, lock); pthread_mutex_unlock(&f->lock); if (!conflict) err = fuse_lock_common(req, ino, fi, lock, F_GETLK); else err = 0; if (!err) fuse_reply_lock(req, lock); else reply_err(req, err); } static void fuse_lib_setlk(fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi, struct flock *lock, int sleep) { int err = fuse_lock_common(req, ino, fi, lock, sleep ? F_SETLKW : F_SETLK); if (!err) { struct fuse *f = req_fuse(req); struct lock l; flock_to_lock(lock, &l); l.owner = fi->lock_owner; pthread_mutex_lock(&f->lock); locks_insert(get_node(f, ino), &l); pthread_mutex_unlock(&f->lock); } reply_err(req, err); } static void fuse_lib_flock(fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi, int op) { struct fuse *f = req_fuse_prepare(req); char *path; int err; err = get_path_nullok(f, ino, &path); if (err == 0) { struct fuse_intr_data d; fuse_prepare_interrupt(f, req, &d); err = fuse_fs_flock(f->fs, path, fi, op); fuse_finish_interrupt(f, req, &d); free_path(f, ino, path); } reply_err(req, err); } static void fuse_lib_bmap(fuse_req_t req, fuse_ino_t ino, size_t blocksize, uint64_t idx) { struct fuse *f = req_fuse_prepare(req); struct fuse_intr_data d; char *path; int err; err = get_path(f, ino, &path); if (!err) { fuse_prepare_interrupt(f, req, &d); err = fuse_fs_bmap(f->fs, path, blocksize, &idx); fuse_finish_interrupt(f, req, &d); free_path(f, ino, path); } if (!err) fuse_reply_bmap(req, idx); else reply_err(req, err); } static void fuse_lib_ioctl(fuse_req_t req, fuse_ino_t ino, unsigned int cmd, void *arg, struct fuse_file_info *llfi, unsigned int flags, const void *in_buf, size_t in_bufsz, size_t out_bufsz) { struct fuse *f = req_fuse_prepare(req); struct fuse_intr_data d; struct fuse_file_info fi; char *path, *out_buf = NULL; int err; err = -EPERM; if (flags & FUSE_IOCTL_UNRESTRICTED) goto err; if (flags & FUSE_IOCTL_DIR) get_dirhandle(llfi, &fi); else fi = *llfi; if (out_bufsz) { err = -ENOMEM; out_buf = malloc(out_bufsz); if (!out_buf) goto err; } assert(!in_bufsz || !out_bufsz || in_bufsz == out_bufsz); if (out_buf && in_bufsz) memcpy(out_buf, in_buf, in_bufsz); err = get_path_nullok(f, ino, &path); if (err) goto err; fuse_prepare_interrupt(f, req, &d); err = fuse_fs_ioctl(f->fs, path, cmd, arg, &fi, flags, out_buf ? out_buf : (void *)in_buf); fuse_finish_interrupt(f, req, &d); free_path(f, ino, path); if (err < 0) goto err; fuse_reply_ioctl(req, err, out_buf, out_bufsz); goto out; err: reply_err(req, err); out: free(out_buf); } static void fuse_lib_poll(fuse_req_t req, fuse_ino_t ino, struct fuse_file_info *fi, struct fuse_pollhandle *ph) { struct fuse *f = req_fuse_prepare(req); struct fuse_intr_data d; char *path; int err; unsigned revents = 0; err = get_path_nullok(f, ino, &path); if (!err) { fuse_prepare_interrupt(f, req, &d); err = fuse_fs_poll(f->fs, path, fi, ph, &revents); fuse_finish_interrupt(f, req, &d); free_path(f, ino, path); } if (!err) fuse_reply_poll(req, revents); else reply_err(req, err); } static void fuse_lib_fallocate(fuse_req_t req, fuse_ino_t ino, int mode, off_t offset, off_t length, struct fuse_file_info *fi) { struct fuse *f = req_fuse_prepare(req); struct fuse_intr_data d; char *path; int err; err = get_path_nullok(f, ino, &path); if (!err) { fuse_prepare_interrupt(f, req, &d); err = fuse_fs_fallocate(f->fs, path, mode, offset, length, fi); fuse_finish_interrupt(f, req, &d); free_path(f, ino, path); } reply_err(req, err); } static void fuse_lib_copy_file_range(fuse_req_t req, fuse_ino_t nodeid_in, off_t off_in, struct fuse_file_info *fi_in, fuse_ino_t nodeid_out, off_t off_out, struct fuse_file_info *fi_out, size_t len, int flags) { struct fuse *f = req_fuse_prepare(req); struct fuse_intr_data d; char *path_in, *path_out; int err; ssize_t res; err = get_path_nullok(f, nodeid_in, &path_in); if (err) { reply_err(req, err); return; } err = get_path_nullok(f, nodeid_out, &path_out); if (err) { free_path(f, nodeid_in, path_in); reply_err(req, err); return; } fuse_prepare_interrupt(f, req, &d); res = fuse_fs_copy_file_range(f->fs, path_in, fi_in, off_in, path_out, fi_out, off_out, len, flags); fuse_finish_interrupt(f, req, &d); if (res >= 0) fuse_reply_write(req, res); else reply_err(req, res); free_path(f, nodeid_in, path_in); free_path(f, nodeid_out, path_out); } static void fuse_lib_lseek(fuse_req_t req, fuse_ino_t ino, off_t off, int whence, struct fuse_file_info *fi) { struct fuse *f = req_fuse_prepare(req); struct fuse_intr_data d; char *path; int err; off_t res; err = get_path(f, ino, &path); if (err) { reply_err(req, err); return; } fuse_prepare_interrupt(f, req, &d); res = fuse_fs_lseek(f->fs, path, off, whence, fi); fuse_finish_interrupt(f, req, &d); free_path(f, ino, path); if (res >= 0) fuse_reply_lseek(req, res); else reply_err(req, res); } static int clean_delay(struct fuse *f) { /* * This is calculating the delay between clean runs. To * reduce the number of cleans we are doing them 10 times * within the remember window. */ int min_sleep = 60; int max_sleep = 3600; int sleep_time = f->conf.remember / 10; if (sleep_time > max_sleep) return max_sleep; if (sleep_time < min_sleep) return min_sleep; return sleep_time; } int fuse_clean_cache(struct fuse *f) { struct node_lru *lnode; struct list_head *curr, *next; struct node *node; struct timespec now; pthread_mutex_lock(&f->lock); curr_time(&now); for (curr = f->lru_table.next; curr != &f->lru_table; curr = next) { double age; next = curr->next; lnode = list_entry(curr, struct node_lru, lru); node = &lnode->node; age = diff_timespec(&now, &lnode->forget_time); if (age <= f->conf.remember) break; assert(node->nlookup == 1); /* Don't forget active directories */ if (node->refctr > 1) continue; node->nlookup = 0; unhash_name(f, node); unref_node(f, node); } pthread_mutex_unlock(&f->lock); return clean_delay(f); } static struct fuse_lowlevel_ops fuse_path_ops = { .init = fuse_lib_init, .destroy = fuse_lib_destroy, .lookup = fuse_lib_lookup, .forget = fuse_lib_forget, .forget_multi = fuse_lib_forget_multi, .getattr = fuse_lib_getattr, .setattr = fuse_lib_setattr, .access = fuse_lib_access, .readlink = fuse_lib_readlink, .mknod = fuse_lib_mknod, .mkdir = fuse_lib_mkdir, .unlink = fuse_lib_unlink, .rmdir = fuse_lib_rmdir, .symlink = fuse_lib_symlink, .rename = fuse_lib_rename, .link = fuse_lib_link, .create = fuse_lib_create, .open = fuse_lib_open, .read = fuse_lib_read, .write_buf = fuse_lib_write_buf, .flush = fuse_lib_flush, .release = fuse_lib_release, .fsync = fuse_lib_fsync, .opendir = fuse_lib_opendir, .readdir = fuse_lib_readdir, .readdirplus = fuse_lib_readdirplus, .releasedir = fuse_lib_releasedir, .fsyncdir = fuse_lib_fsyncdir, .statfs = fuse_lib_statfs, .setxattr = fuse_lib_setxattr, .getxattr = fuse_lib_getxattr, .listxattr = fuse_lib_listxattr, .removexattr = fuse_lib_removexattr, .getlk = fuse_lib_getlk, .setlk = fuse_lib_setlk, .flock = fuse_lib_flock, .bmap = fuse_lib_bmap, .ioctl = fuse_lib_ioctl, .poll = fuse_lib_poll, .fallocate = fuse_lib_fallocate, .copy_file_range = fuse_lib_copy_file_range, .lseek = fuse_lib_lseek, }; int fuse_notify_poll(struct fuse_pollhandle *ph) { return fuse_lowlevel_notify_poll(ph); } struct fuse_session *fuse_get_session(struct fuse *f) { return f->se; } static int fuse_session_loop_remember(struct fuse *f) { struct fuse_session *se = f->se; int res = 0; struct timespec now; time_t next_clean; struct pollfd fds = { .fd = se->fd, .events = POLLIN }; struct fuse_buf fbuf = { .mem = NULL, }; curr_time(&now); next_clean = now.tv_sec; while (!fuse_session_exited(se)) { unsigned timeout; curr_time(&now); if (now.tv_sec < next_clean) timeout = next_clean - now.tv_sec; else timeout = 0; res = poll(&fds, 1, timeout * 1000); if (res == -1) { if (errno == EINTR) continue; else break; } else if (res > 0) { res = fuse_session_receive_buf_int(se, &fbuf, NULL); if (res == -EINTR) continue; if (res <= 0) break; fuse_session_process_buf_int(se, &fbuf, NULL); } else { timeout = fuse_clean_cache(f); curr_time(&now); next_clean = now.tv_sec + timeout; } } free(fbuf.mem); fuse_session_reset(se); return res < 0 ? -1 : 0; } int fuse_loop(struct fuse *f) { if (!f) return -1; if (lru_enabled(f)) return fuse_session_loop_remember(f); return fuse_session_loop(f->se); } FUSE_SYMVER("fuse_loop_mt_312", "fuse_loop_mt@@FUSE_3.12") int fuse_loop_mt_312(struct fuse *f, struct fuse_loop_config *config) { if (f == NULL) return -1; int res = fuse_start_cleanup_thread(f); if (res) return -1; res = fuse_session_loop_mt_312(fuse_get_session(f), config); fuse_stop_cleanup_thread(f); return res; } int fuse_loop_mt_32(struct fuse *f, struct fuse_loop_config_v1 *config_v1); FUSE_SYMVER("fuse_loop_mt_32", "fuse_loop_mt@FUSE_3.2") int fuse_loop_mt_32(struct fuse *f, struct fuse_loop_config_v1 *config_v1) { struct fuse_loop_config *config = fuse_loop_cfg_create(); if (config == NULL) return ENOMEM; fuse_loop_cfg_convert(config, config_v1); int res = fuse_loop_mt_312(f, config); fuse_loop_cfg_destroy(config); return res; } int fuse_loop_mt_31(struct fuse *f, int clone_fd); FUSE_SYMVER("fuse_loop_mt_31", "fuse_loop_mt@FUSE_3.0") int fuse_loop_mt_31(struct fuse *f, int clone_fd) { int err; struct fuse_loop_config *config = fuse_loop_cfg_create(); if (config == NULL) return ENOMEM; fuse_loop_cfg_set_clone_fd(config, clone_fd); err = fuse_loop_mt_312(f, config); fuse_loop_cfg_destroy(config); return err; } void fuse_exit(struct fuse *f) { fuse_session_exit(f->se); } struct fuse_context *fuse_get_context(void) { struct fuse_context_i *c = fuse_get_context_internal(); if (c) return &c->ctx; else return NULL; } int fuse_getgroups(int size, gid_t list[]) { struct fuse_context_i *c = fuse_get_context_internal(); if (!c) return -EINVAL; return fuse_req_getgroups(c->req, size, list); } int fuse_interrupted(void) { struct fuse_context_i *c = fuse_get_context_internal(); if (c) return fuse_req_interrupted(c->req); else return 0; } int fuse_invalidate_path(struct fuse *f, const char *path) { fuse_ino_t ino; int err = lookup_path_in_cache(f, path, &ino); if (err) { return err; } return fuse_lowlevel_notify_inval_inode(f->se, ino, 0, 0); } #define FUSE_LIB_OPT(t, p, v) { t, offsetof(struct fuse_config, p), v } static const struct fuse_opt fuse_lib_opts[] = { FUSE_OPT_KEY("debug", FUSE_OPT_KEY_KEEP), FUSE_OPT_KEY("-d", FUSE_OPT_KEY_KEEP), FUSE_LIB_OPT("debug", debug, 1), FUSE_LIB_OPT("-d", debug, 1), FUSE_LIB_OPT("kernel_cache", kernel_cache, 1), FUSE_LIB_OPT("auto_cache", auto_cache, 1), FUSE_LIB_OPT("noauto_cache", auto_cache, 0), FUSE_LIB_OPT("no_rofd_flush", no_rofd_flush, 1), FUSE_LIB_OPT("umask=", set_mode, 1), FUSE_LIB_OPT("umask=%o", umask, 0), FUSE_LIB_OPT("uid=", set_uid, 1), FUSE_LIB_OPT("uid=%d", uid, 0), FUSE_LIB_OPT("gid=", set_gid, 1), FUSE_LIB_OPT("gid=%d", gid, 0), FUSE_LIB_OPT("entry_timeout=%lf", entry_timeout, 0), FUSE_LIB_OPT("attr_timeout=%lf", attr_timeout, 0), FUSE_LIB_OPT("ac_attr_timeout=%lf", ac_attr_timeout, 0), FUSE_LIB_OPT("ac_attr_timeout=", ac_attr_timeout_set, 1), FUSE_LIB_OPT("negative_timeout=%lf", negative_timeout, 0), FUSE_LIB_OPT("noforget", remember, -1), FUSE_LIB_OPT("remember=%u", remember, 0), FUSE_LIB_OPT("modules=%s", modules, 0), FUSE_LIB_OPT("parallel_direct_write=%d", parallel_direct_writes, 0), FUSE_OPT_END }; static int fuse_lib_opt_proc(void *data, const char *arg, int key, struct fuse_args *outargs) { (void) arg; (void) outargs; (void) data; (void) key; /* Pass through unknown options */ return 1; } static const struct fuse_opt fuse_help_opts[] = { FUSE_LIB_OPT("modules=%s", modules, 1), FUSE_OPT_KEY("modules=%s", FUSE_OPT_KEY_KEEP), FUSE_OPT_END }; static void print_module_help(const char *name, fuse_module_factory_t *fac) { struct fuse_args a = FUSE_ARGS_INIT(0, NULL); if (fuse_opt_add_arg(&a, "") == -1 || fuse_opt_add_arg(&a, "-h") == -1) return; printf("\nOptions for %s module:\n", name); (*fac)(&a, NULL); fuse_opt_free_args(&a); } void fuse_lib_help(struct fuse_args *args) { /* These are not all options, but only the ones that may be of interest to an end-user */ printf( " -o kernel_cache cache files in kernel\n" " -o [no]auto_cache enable caching based on modification times (off)\n" " -o no_rofd_flush disable flushing of read-only fd on close (off)\n" " -o umask=M set file permissions (octal)\n" " -o uid=N set file owner\n" " -o gid=N set file group\n" " -o entry_timeout=T cache timeout for names (1.0s)\n" " -o negative_timeout=T cache timeout for deleted names (0.0s)\n" " -o attr_timeout=T cache timeout for attributes (1.0s)\n" " -o ac_attr_timeout=T auto cache timeout for attributes (attr_timeout)\n" " -o noforget never forget cached inodes\n" " -o remember=T remember cached inodes for T seconds (0s)\n" " -o modules=M1[:M2...] names of modules to push onto filesystem stack\n"); /* Print low-level help */ fuse_lowlevel_help(); /* Print help for builtin modules */ print_module_help("subdir", &fuse_module_subdir_factory); #ifdef HAVE_ICONV print_module_help("iconv", &fuse_module_iconv_factory); #endif /* Parse command line options in case we need to activate more modules */ struct fuse_config conf = { .modules = NULL }; if (fuse_opt_parse(args, &conf, fuse_help_opts, fuse_lib_opt_proc) == -1 || !conf.modules) return; char *module; char *next; struct fuse_module *m; // Iterate over all modules for (module = conf.modules; module; module = next) { char *p; for (p = module; *p && *p != ':'; p++); next = *p ? p + 1 : NULL; *p = '\0'; m = fuse_get_module(module); if (m) print_module_help(module, &m->factory); } } static int fuse_init_intr_signal(int signum, int *installed) { struct sigaction old_sa; if (sigaction(signum, NULL, &old_sa) == -1) { perror("fuse: cannot get old signal handler"); return -1; } if (old_sa.sa_handler == SIG_DFL) { struct sigaction sa; memset(&sa, 0, sizeof(struct sigaction)); sa.sa_handler = fuse_intr_sighandler; sigemptyset(&sa.sa_mask); if (sigaction(signum, &sa, NULL) == -1) { perror("fuse: cannot set interrupt signal handler"); return -1; } *installed = 1; } return 0; } static void fuse_restore_intr_signal(int signum) { struct sigaction sa; memset(&sa, 0, sizeof(struct sigaction)); sa.sa_handler = SIG_DFL; sigaction(signum, &sa, NULL); } static int fuse_push_module(struct fuse *f, const char *module, struct fuse_args *args) { struct fuse_fs *fs[2] = { f->fs, NULL }; struct fuse_fs *newfs; struct fuse_module *m = fuse_get_module(module); if (!m) return -1; newfs = m->factory(args, fs); if (!newfs) { fuse_put_module(m); return -1; } f->fs = newfs; return 0; } struct fuse_fs *fuse_fs_new(const struct fuse_operations *op, size_t op_size, void *user_data) { struct fuse_fs *fs; if (sizeof(struct fuse_operations) < op_size) { fuse_log(FUSE_LOG_ERR, "fuse: warning: library too old, some operations may not not work\n"); op_size = sizeof(struct fuse_operations); } fs = (struct fuse_fs *) calloc(1, sizeof(struct fuse_fs)); if (!fs) { fuse_log(FUSE_LOG_ERR, "fuse: failed to allocate fuse_fs object\n"); return NULL; } fs->user_data = user_data; if (op) memcpy(&fs->op, op, op_size); return fs; } static int node_table_init(struct node_table *t) { t->size = NODE_TABLE_MIN_SIZE; t->array = (struct node **) calloc(1, sizeof(struct node *) * t->size); if (t->array == NULL) { fuse_log(FUSE_LOG_ERR, "fuse: memory allocation failed\n"); return -1; } t->use = 0; t->split = 0; return 0; } static void *fuse_prune_nodes(void *fuse) { struct fuse *f = fuse; int sleep_time; while(1) { sleep_time = fuse_clean_cache(f); sleep(sleep_time); } return NULL; } int fuse_start_cleanup_thread(struct fuse *f) { if (lru_enabled(f)) return fuse_start_thread(&f->prune_thread, fuse_prune_nodes, f); return 0; } void fuse_stop_cleanup_thread(struct fuse *f) { if (lru_enabled(f)) { pthread_mutex_lock(&f->lock); pthread_cancel(f->prune_thread); pthread_mutex_unlock(&f->lock); pthread_join(f->prune_thread, NULL); } } /* * Not supposed to be called directly, but supposed to be called * through the fuse_new macro */ struct fuse *_fuse_new_317(struct fuse_args *args, const struct fuse_operations *op, size_t op_size, struct libfuse_version *version, void *user_data); FUSE_SYMVER("_fuse_new_317", "_fuse_new@@FUSE_3.17") struct fuse *_fuse_new_317(struct fuse_args *args, const struct fuse_operations *op, size_t op_size, struct libfuse_version *version, void *user_data) { struct fuse *f; struct node *root; struct fuse_fs *fs; struct fuse_lowlevel_ops llop = fuse_path_ops; f = (struct fuse *) calloc(1, sizeof(struct fuse)); if (f == NULL) { fuse_log(FUSE_LOG_ERR, "fuse: failed to allocate fuse object\n"); goto out; } f->conf.entry_timeout = 1.0; f->conf.attr_timeout = 1.0; f->conf.negative_timeout = 0.0; f->conf.intr_signal = FUSE_DEFAULT_INTR_SIGNAL; /* Parse options */ if (fuse_opt_parse(args, &f->conf, fuse_lib_opts, fuse_lib_opt_proc) == -1) goto out_free; pthread_mutex_lock(&fuse_context_lock); static int builtin_modules_registered = 0; /* Have the builtin modules already been registered? */ if (builtin_modules_registered == 0) { /* If not, register them. */ fuse_register_module("subdir", fuse_module_subdir_factory, NULL); #ifdef HAVE_ICONV fuse_register_module("iconv", fuse_module_iconv_factory, NULL); #endif builtin_modules_registered= 1; } pthread_mutex_unlock(&fuse_context_lock); if (fuse_create_context_key() == -1) goto out_free; fs = fuse_fs_new(op, op_size, user_data); if (!fs) goto out_delete_context_key; f->fs = fs; /* Oh f**k, this is ugly! */ if (!fs->op.lock) { llop.getlk = NULL; llop.setlk = NULL; } f->pagesize = getpagesize(); init_list_head(&f->partial_slabs); init_list_head(&f->full_slabs); init_list_head(&f->lru_table); if (f->conf.modules) { char *module; char *next; for (module = f->conf.modules; module; module = next) { char *p; for (p = module; *p && *p != ':'; p++); next = *p ? p + 1 : NULL; *p = '\0'; if (module[0] && fuse_push_module(f, module, args) == -1) goto out_free_fs; } } if (!f->conf.ac_attr_timeout_set) f->conf.ac_attr_timeout = f->conf.attr_timeout; #if defined(__FreeBSD__) || defined(__NetBSD__) /* * In FreeBSD, we always use these settings as inode numbers * are needed to make getcwd(3) work. */ f->conf.readdir_ino = 1; #endif f->se = _fuse_session_new(args, &llop, sizeof(llop), version, f); if (f->se == NULL) goto out_free_fs; if (f->conf.debug) { fuse_log(FUSE_LOG_DEBUG, "nullpath_ok: %i\n", f->conf.nullpath_ok); } /* Trace topmost layer by default */ f->fs->debug = f->conf.debug; f->ctr = 0; f->generation = 0; if (node_table_init(&f->name_table) == -1) goto out_free_session; if (node_table_init(&f->id_table) == -1) goto out_free_name_table; pthread_mutex_init(&f->lock, NULL); root = alloc_node(f); if (root == NULL) { fuse_log(FUSE_LOG_ERR, "fuse: memory allocation failed\n"); goto out_free_id_table; } if (lru_enabled(f)) { struct node_lru *lnode = node_lru(root); init_list_head(&lnode->lru); } strcpy(root->inline_name, "/"); root->name = root->inline_name; if (f->conf.intr && fuse_init_intr_signal(f->conf.intr_signal, &f->intr_installed) == -1) goto out_free_root; root->parent = NULL; root->nodeid = FUSE_ROOT_ID; inc_nlookup(root); hash_id(f, root); return f; out_free_root: free(root); out_free_id_table: free(f->id_table.array); out_free_name_table: free(f->name_table.array); out_free_session: fuse_session_destroy(f->se); out_free_fs: free(f->fs); free(f->conf.modules); out_delete_context_key: fuse_delete_context_key(); out_free: free(f); out: return NULL; } /* Emulates 3.0-style fuse_new(), which processes --help */ struct fuse *_fuse_new_30(struct fuse_args *args, const struct fuse_operations *op, size_t op_size, struct libfuse_version *version, void *user_data); FUSE_SYMVER("_fuse_new_30", "_fuse_new@FUSE_3.0") struct fuse *_fuse_new_30(struct fuse_args *args, const struct fuse_operations *op, size_t op_size, struct libfuse_version *version, void *user_data) { struct fuse_config conf = {0}; const struct fuse_opt opts[] = { FUSE_LIB_OPT("-h", show_help, 1), FUSE_LIB_OPT("--help", show_help, 1), FUSE_OPT_END }; if (fuse_opt_parse(args, &conf, opts, fuse_lib_opt_proc) == -1) return NULL; if (conf.show_help) { fuse_lib_help(args); return NULL; } else return _fuse_new_317(args, op, op_size, version, user_data); } /* ABI compat version */ struct fuse *fuse_new_31(struct fuse_args *args, const struct fuse_operations *op, size_t op_size, void *user_data); FUSE_SYMVER("fuse_new_31", "fuse_new@FUSE_3.1") struct fuse *fuse_new_31(struct fuse_args *args, const struct fuse_operations *op, size_t op_size, void *user_data) { /* unknown version */ struct libfuse_version version = { 0 }; return _fuse_new_317(args, op, op_size, &version, user_data); } /* * ABI compat version * Emulates 3.0-style fuse_new(), which processes --help */ struct fuse *fuse_new_30(struct fuse_args *args, const struct fuse_operations *op, size_t op_size, void *user_data); FUSE_SYMVER("fuse_new_30", "fuse_new@FUSE_3.0") struct fuse *fuse_new_30(struct fuse_args *args, const struct fuse_operations *op, size_t op_size, void *user_data) { struct fuse_config conf = {0}; const struct fuse_opt opts[] = { FUSE_LIB_OPT("-h", show_help, 1), FUSE_LIB_OPT("--help", show_help, 1), FUSE_OPT_END }; if (fuse_opt_parse(args, &conf, opts, fuse_lib_opt_proc) == -1) return NULL; if (conf.show_help) { fuse_lib_help(args); return NULL; } else return fuse_new_31(args, op, op_size, user_data); } void fuse_destroy(struct fuse *f) { size_t i; if (f->conf.intr && f->intr_installed) fuse_restore_intr_signal(f->conf.intr_signal); if (f->fs) { fuse_create_context(f); for (i = 0; i < f->id_table.size; i++) { struct node *node; for (node = f->id_table.array[i]; node != NULL; node = node->id_next) { if (node->is_hidden) { char *path; if (try_get_path(f, node->nodeid, NULL, &path, NULL, false) == 0) { fuse_fs_unlink(f->fs, path); free(path); } } } } } for (i = 0; i < f->id_table.size; i++) { struct node *node; struct node *next; for (node = f->id_table.array[i]; node != NULL; node = next) { next = node->id_next; free_node(f, node); f->id_table.use--; } } assert(list_empty(&f->partial_slabs)); assert(list_empty(&f->full_slabs)); while (fuse_modules) { fuse_put_module(fuse_modules); } free(f->id_table.array); free(f->name_table.array); pthread_mutex_destroy(&f->lock); fuse_session_destroy(f->se); free(f->fs); free(f->conf.modules); free(f); fuse_delete_context_key(); } int fuse_mount(struct fuse *f, const char *mountpoint) { return fuse_session_mount(fuse_get_session(f), mountpoint); } void fuse_unmount(struct fuse *f) { fuse_session_unmount(fuse_get_session(f)); } int fuse_version(void) { return FUSE_VERSION; } const char *fuse_pkgversion(void) { return PACKAGE_VERSION; }