/* FUSE: Filesystem in Userspace Copyright (C) 2001-2007 Miklos Szeredi This program can be distributed under the terms of the GNU LGPLv2. See the file COPYING.LIB */ #include "config.h" #include "fuse_i.h" #include "fuse_lowlevel.h" #include "fuse_opt.h" #include "fuse_misc.h" #include #include #include #include #include #include #include #include #include #include #include #include #include #include #include #define FUSE_DEFAULT_INTR_SIGNAL SIGUSR1 #define FUSE_UNKNOWN_INO 0xffffffff #define OFFSET_MAX 0x7fffffffffffffffLL struct fuse_config { unsigned int uid; unsigned int gid; unsigned int umask; double entry_timeout; double negative_timeout; double attr_timeout; double ac_attr_timeout; int ac_attr_timeout_set; int debug; int hard_remove; int use_ino; int readdir_ino; int set_mode; int set_uid; int set_gid; int direct_io; int kernel_cache; int intr; int intr_signal; int help; }; struct fuse_fs { struct fuse_operations op; void *user_data; }; struct fuse { struct fuse_session *se; struct node **name_table; size_t name_table_size; struct node **id_table; size_t id_table_size; fuse_ino_t ctr; unsigned int generation; unsigned int hidectr; pthread_mutex_t lock; pthread_rwlock_t tree_lock; struct fuse_config conf; int intr_installed; struct fuse_fs *fs; int utime_omit_ok; }; 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; int is_hidden; struct lock *locks; }; struct fuse_dh { pthread_mutex_t lock; struct fuse *fuse; fuse_req_t req; char *contents; int allocated; 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; }; static pthread_key_t fuse_context_key; static pthread_mutex_t fuse_context_lock = PTHREAD_MUTEX_INITIALIZER; static int fuse_context_ref; static struct node *get_node_nocheck(struct fuse *f, fuse_ino_t nodeid) { size_t hash = nodeid % f->id_table_size; struct node *node; for (node = f->id_table[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) { fprintf(stderr, "fuse internal error: node %llu not found\n", (unsigned long long) nodeid); abort(); } return node; } static void free_node(struct node *node) { free(node->name); free(node); } static void unhash_id(struct fuse *f, struct node *node) { size_t hash = node->nodeid % f->id_table_size; struct node **nodep = &f->id_table[hash]; for (; *nodep != NULL; nodep = &(*nodep)->id_next) if (*nodep == node) { *nodep = node->id_next; return; } } static void hash_id(struct fuse *f, struct node *node) { size_t hash = node->nodeid % f->id_table_size; node->id_next = f->id_table[hash]; f->id_table[hash] = node; } static unsigned int name_hash(struct fuse *f, fuse_ino_t parent, const char *name) { unsigned int hash = *name; if (hash) for (name += 1; *name != '\0'; name++) hash = (hash << 5) - hash + *name; return (hash + parent) % f->name_table_size; } static void unref_node(struct fuse *f, struct node *node); 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[hash]; for (; *nodep != NULL; nodep = &(*nodep)->name_next) if (*nodep == node) { *nodep = node->name_next; node->name_next = NULL; unref_node(f, node->parent); free(node->name); node->name = NULL; node->parent = NULL; return; } fprintf(stderr, "fuse internal error: unable to unhash node: %llu\n", (unsigned long long) node->nodeid); abort(); } } 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); node->name = strdup(name); if (node->name == NULL) return -1; parent->refctr ++; node->parent = parent; node->name_next = f->name_table[hash]; f->name_table[hash] = node; return 0; } static void delete_node(struct fuse *f, struct node *node) { if (f->conf.debug) fprintf(stderr, "delete: %llu\n", (unsigned long long) node->nodeid); assert(!node->name); unhash_id(f, node); free_node(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[hash]; node != NULL; node = node->name_next) if (node->parent->nodeid == parent && strcmp(node->name, name) == 0) return node; return NULL; } static struct node *find_node(struct fuse *f, fuse_ino_t parent, const char *name) { struct node *node; pthread_mutex_lock(&f->lock); node = lookup_node(f, parent, name); if (node == NULL) { node = (struct node *) calloc(1, sizeof(struct node)); if (node == NULL) goto out_err; node->refctr = 1; node->nodeid = next_id(f); node->open_count = 0; node->is_hidden = 0; node->generation = f->generation; if (hash_name(f, node, parent, name) == -1) { free(node); node = NULL; goto out_err; } hash_id(f, node); } node->nlookup ++; out_err: pthread_mutex_unlock(&f->lock); return node; } 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; strncpy(s, name, len); s--; *s = '/'; return s; } static char *get_path_name(struct fuse *f, fuse_ino_t nodeid, const char *name) { unsigned bufsize = 256; char *buf; char *s; struct node *node; buf = malloc(bufsize); if (buf == NULL) return NULL; s = buf + bufsize - 1; *s = '\0'; if (name != NULL) { s = add_name(&buf, &bufsize, s, name); if (s == NULL) goto out_free; } pthread_mutex_lock(&f->lock); for (node = get_node(f, nodeid); node && node->nodeid != FUSE_ROOT_ID; node = node->parent) { if (node->name == NULL) { s = NULL; break; } s = add_name(&buf, &bufsize, s, node->name); if (s == NULL) break; } pthread_mutex_unlock(&f->lock); if (node == NULL || s == NULL) goto out_free; if (s[0]) memmove(buf, s, bufsize - (s - buf)); else strcpy(buf, "/"); return buf; out_free: free(buf); return NULL; } static char *get_path(struct fuse *f, fuse_ino_t nodeid) { return get_path_name(f, nodeid, NULL); } 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); assert(node->nlookup >= nlookup); node->nlookup -= nlookup; if (!node->nlookup) { unhash_name(f, node); unref_node(f, node); } pthread_mutex_unlock(&f->lock); } 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) unhash_name(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) { fprintf(stderr, "fuse: hidden file got created during hiding\n"); err = -EBUSY; goto out; } unhash_name(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 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 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 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); } int fuse_fs_getattr(struct fuse_fs *fs, const char *path, struct stat *buf) { fuse_get_context()->private_data = fs->user_data; if (fs->op.getattr) return fs->op.getattr(path, buf); else return -ENOSYS; } int fuse_fs_fgetattr(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.fgetattr) return fs->op.fgetattr(path, buf, fi); else if (fs->op.getattr) return fs->op.getattr(path, buf); else return -ENOSYS; } int fuse_fs_rename(struct fuse_fs *fs, const char *oldpath, const char *newpath) { fuse_get_context()->private_data = fs->user_data; if (fs->op.rename) return fs->op.rename(oldpath, newpath); 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) 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) 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) 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) 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) 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) return fs->op.opendir(path, fi); 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) return fs->op.open(path, fi); else return 0; } int fuse_fs_read(struct fuse_fs *fs, const char *path, char *buf, size_t size, off_t off, struct fuse_file_info *fi) { fuse_get_context()->private_data = fs->user_data; if (fs->op.read) return fs->op.read(path, buf, size, off, fi); else return -ENOSYS; } int fuse_fs_write(struct fuse_fs *fs, const char *path, const char *buf, size_t size, off_t off, struct fuse_file_info *fi) { fuse_get_context()->private_data = fs->user_data; if (fs->op.write) return fs->op.write(path, buf, size, off, fi); else return -ENOSYS; } 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) 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) 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) 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) 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) 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) { fuse_get_context()->private_data = fs->user_data; if (fs->op.readdir) return fs->op.readdir(path, buf, filler, off, fi); 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) return fs->op.create(path, mode, fi); 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) return fs->op.lock(path, fi, cmd, lock); else return -ENOSYS; } int fuse_fs_chown(struct fuse_fs *fs, const char *path, uid_t uid, gid_t gid) { fuse_get_context()->private_data = fs->user_data; if (fs->op.chown) return fs->op.chown(path, uid, gid); else return -ENOSYS; } int fuse_fs_truncate(struct fuse_fs *fs, const char *path, off_t size) { fuse_get_context()->private_data = fs->user_data; if (fs->op.truncate) return fs->op.truncate(path, size); else return -ENOSYS; } int fuse_fs_ftruncate(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.ftruncate) return fs->op.ftruncate(path, size, fi); else if (fs->op.truncate) return fs->op.truncate(path, size); else return -ENOSYS; } int fuse_fs_utimens(struct fuse_fs *fs, const char *path, const struct timespec tv[2]) { fuse_get_context()->private_data = fs->user_data; if (fs->op.utimens) return fs->op.utimens(path, tv); else if(fs->op.utime) { struct utimbuf buf; buf.actime = tv[0].tv_sec; buf.modtime = tv[1].tv_sec; return fs->op.utime(path, &buf); } 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) 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) 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) 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) 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) 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) 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) 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) 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) return fs->op.removexattr(path, name); 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); pthread_mutex_unlock(&f->lock); newpath = get_path_name(f, dir, newname); if (!newpath) break; res = fuse_fs_getattr(f->fs, newpath, &buf); 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); if (!err) err = rename_node(f, dir, oldname, dir, newname, 1); free(newpath); } return err; } 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)); if (fi) res = fuse_fs_fgetattr(f->fs, path, &e->attr, fi); else res = fuse_fs_getattr(f->fs, path, &e->attr); if (res == 0) { struct node *node; node = find_node(f, nodeid, name); if (node == NULL) res = -ENOMEM; else { e->ino = node->nodeid; e->generation = node->generation; e->entry_timeout = f->conf.entry_timeout; e->attr_timeout = f->conf.attr_timeout; set_stat(f, e->ino, &e->attr); if (f->conf.debug) fprintf(stderr, " NODEID: %lu\n", (unsigned long) e->ino); } } return res; } static struct fuse_context_i *fuse_get_context_internal(void) { struct fuse_context_i *c; c = (struct fuse_context_i *) pthread_getspecific(fuse_context_key); if (c == NULL) { c = (struct fuse_context_i *) malloc(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 */ fprintf(stderr, "fuse: failed to allocate thread specific data\n"); abort(); } pthread_setspecific(fuse_context_key, c); } 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) { fprintf(stderr, "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_get_context_internal(); const struct fuse_ctx *ctx = fuse_req_ctx(req); c->req = req; c->ctx.fuse = req_fuse(req); c->ctx.uid = ctx->uid; c->ctx.gid = ctx->gid; c->ctx.pid = ctx->pid; #ifdef POSIXACLS c->ctx.umask = ctx->umask; #endif return c->ctx.fuse; } static 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) forget_node(f, e->ino, 1); } else reply_err(req, err); } void fuse_fs_init(struct fuse_fs *fs, struct fuse_conn_info *conn) { fuse_get_context()->private_data = fs->user_data; if (fs->op.init) fs->user_data = fs->op.init(conn); } static void fuse_lib_init(void *data, struct fuse_conn_info *conn) { struct fuse *f = (struct fuse *) data; struct fuse_context_i *c = fuse_get_context_internal(); memset(c, 0, sizeof(*c)); c->ctx.fuse = f; fuse_fs_init(f->fs, conn); } 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); free(fs); } static void fuse_lib_destroy(void *data) { struct fuse *f = (struct fuse *) data; struct fuse_context_i *c = fuse_get_context_internal(); memset(c, 0, sizeof(*c)); c->ctx.fuse = f; fuse_fs_destroy(f->fs); f->fs = NULL; } 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; err = -ENOENT; pthread_rwlock_rdlock(&f->tree_lock); path = get_path_name(f, parent, name); if (path != NULL) { struct fuse_intr_data d; if (f->conf.debug) fprintf(stderr, "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); } pthread_rwlock_unlock(&f->tree_lock); reply_entry(req, &e, err); } static void fuse_lib_forget(fuse_req_t req, fuse_ino_t ino, unsigned long nlookup) { struct fuse *f = req_fuse(req); if (f->conf.debug) fprintf(stderr, "FORGET %llu/%lu\n", (unsigned long long)ino, nlookup); forget_node(f, ino, 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; (void) fi; memset(&buf, 0, sizeof(buf)); err = -ENOENT; pthread_rwlock_rdlock(&f->tree_lock); path = get_path(f, ino); if (path != NULL) { struct fuse_intr_data d; fuse_prepare_interrupt(f, req, &d); err = fuse_fs_getattr(f->fs, path, &buf); fuse_finish_interrupt(f, req, &d); free(path); } pthread_rwlock_unlock(&f->tree_lock); if (!err) { 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) { fuse_get_context()->private_data = fs->user_data; if (fs->op.chmod) return fs->op.chmod(path, mode); 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; err = -ENOENT; pthread_rwlock_rdlock(&f->tree_lock); path = get_path(f, ino); if (path != NULL) { 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); 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); } if (!err && (valid & FUSE_SET_ATTR_SIZE)) { if (fi) err = fuse_fs_ftruncate(f->fs, path, attr->st_size, fi); else err = fuse_fs_truncate(f->fs, path, attr->st_size); } #ifdef HAVE_UTIMENSAT if (!err && f->utime_omit_ok && (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); } 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); } if (!err) err = fuse_fs_getattr(f->fs, path, &buf); fuse_finish_interrupt(f, req, &d); free(path); } pthread_rwlock_unlock(&f->tree_lock); if (!err) { 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 = -ENOENT; pthread_rwlock_rdlock(&f->tree_lock); path = get_path(f, ino); if (path != NULL) { struct fuse_intr_data d; if (f->conf.debug) fprintf(stderr, "ACCESS %s 0%o\n", path, mask); fuse_prepare_interrupt(f, req, &d); err = fuse_fs_access(f->fs, path, mask); fuse_finish_interrupt(f, req, &d); free(path); } pthread_rwlock_unlock(&f->tree_lock); 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 = -ENOENT; pthread_rwlock_rdlock(&f->tree_lock); path = get_path(f, ino); if (path != NULL) { 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); } pthread_rwlock_unlock(&f->tree_lock); 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 = -ENOENT; pthread_rwlock_rdlock(&f->tree_lock); path = get_path_name(f, parent, name); if (path) { struct fuse_intr_data d; if (f->conf.debug) fprintf(stderr, "MKNOD %s\n", path); 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); } pthread_rwlock_unlock(&f->tree_lock); 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 = -ENOENT; pthread_rwlock_rdlock(&f->tree_lock); path = get_path_name(f, parent, name); if (path != NULL) { struct fuse_intr_data d; if (f->conf.debug) fprintf(stderr, "MKDIR %s\n", path); 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); } pthread_rwlock_unlock(&f->tree_lock); 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); char *path; int err; err = -ENOENT; pthread_rwlock_wrlock(&f->tree_lock); path = get_path_name(f, parent, name); if (path != NULL) { struct fuse_intr_data d; if (f->conf.debug) fprintf(stderr, "UNLINK %s\n", path); fuse_prepare_interrupt(f, req, &d); if (!f->conf.hard_remove && is_open(f, parent, name)) err = hide_node(f, path, parent, name); else { err = fuse_fs_unlink(f->fs, path); if (!err) remove_node(f, parent, name); } fuse_finish_interrupt(f, req, &d); free(path); } pthread_rwlock_unlock(&f->tree_lock); 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); char *path; int err; err = -ENOENT; pthread_rwlock_wrlock(&f->tree_lock); path = get_path_name(f, parent, name); if (path != NULL) { struct fuse_intr_data d; if (f->conf.debug) fprintf(stderr, "RMDIR %s\n", path); 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); } pthread_rwlock_unlock(&f->tree_lock); 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 = -ENOENT; pthread_rwlock_rdlock(&f->tree_lock); path = get_path_name(f, parent, name); if (path != NULL) { struct fuse_intr_data d; if (f->conf.debug) fprintf(stderr, "SYMLINK %s\n", path); 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); } pthread_rwlock_unlock(&f->tree_lock); 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) { struct fuse *f = req_fuse_prepare(req); char *oldpath; char *newpath; int err; err = -ENOENT; pthread_rwlock_wrlock(&f->tree_lock); oldpath = get_path_name(f, olddir, oldname); if (oldpath != NULL) { newpath = get_path_name(f, newdir, newname); if (newpath != NULL) { struct fuse_intr_data d; if (f->conf.debug) fprintf(stderr, "RENAME %s -> %s\n", oldpath, newpath); err = 0; fuse_prepare_interrupt(f, req, &d); if (!f->conf.hard_remove && is_open(f, newdir, newname)) err = hide_node(f, newpath, newdir, newname); if (!err) { err = fuse_fs_rename(f->fs, oldpath, newpath); if (!err) err = rename_node(f, olddir, oldname, newdir, newname, 0); } fuse_finish_interrupt(f, req, &d); free(newpath); } free(oldpath); } pthread_rwlock_unlock(&f->tree_lock); 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 = -ENOENT; pthread_rwlock_rdlock(&f->tree_lock); oldpath = get_path(f, ino); if (oldpath != NULL) { newpath = get_path_name(f, newparent, newname); if (newpath != NULL) { struct fuse_intr_data d; if (f->conf.debug) fprintf(stderr, "LINK %s\n", newpath); 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(newpath); } free(oldpath); } pthread_rwlock_unlock(&f->tree_lock); 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 ? 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 && path) fuse_fs_unlink(f->fs, path); } 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 = -ENOENT; pthread_rwlock_rdlock(&f->tree_lock); path = get_path_name(f, parent, name); if (path) { 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; } } 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_prepare_interrupt(f, req, &d); fuse_do_release(f, e.ino, path, fi); fuse_finish_interrupt(f, req, &d); forget_node(f, e.ino, 1); } else if (f->conf.debug) { fprintf(stderr, " CREATE[%llu] flags: 0x%x %s\n", (unsigned long long) fi->fh, fi->flags, path); } } else reply_err(req, err); if (path) free(path); pthread_rwlock_unlock(&f->tree_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 = NULL; int err = 0; err = -ENOENT; pthread_rwlock_rdlock(&f->tree_lock); path = get_path(f, ino); if (path) { 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; } 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_prepare_interrupt(f, req, &d); fuse_do_release(f, ino, path, fi); fuse_finish_interrupt(f, req, &d); } else if (f->conf.debug) { fprintf(stderr, "OPEN[%llu] flags: 0x%x %s\n", (unsigned long long) fi->fh, fi->flags, path); } } else reply_err(req, err); if (path) free(path); pthread_rwlock_unlock(&f->tree_lock); } 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); char *path; char *buf; int res; buf = (char *) malloc(size); if (buf == NULL) { reply_err(req, -ENOMEM); return; } res = -ENOENT; pthread_rwlock_rdlock(&f->tree_lock); path = get_path(f, ino); if (path != NULL) { struct fuse_intr_data d; if (f->conf.debug) fprintf(stderr, "READ[%llu] %lu bytes from %llu\n", (unsigned long long) fi->fh, (unsigned long) size, (unsigned long long) off); fuse_prepare_interrupt(f, req, &d); res = fuse_fs_read(f->fs, path, buf, size, off, fi); fuse_finish_interrupt(f, req, &d); free(path); } pthread_rwlock_unlock(&f->tree_lock); if (res >= 0) { if (f->conf.debug) fprintf(stderr, " READ[%llu] %u bytes\n", (unsigned long long)fi->fh, res); if ((size_t) res > size) fprintf(stderr, "fuse: read too many bytes"); fuse_reply_buf(req, buf, res); } else reply_err(req, res); free(buf); } static void fuse_lib_write(fuse_req_t req, fuse_ino_t ino, const char *buf, size_t size, off_t off, struct fuse_file_info *fi) { struct fuse *f = req_fuse_prepare(req); char *path; int res; res = -ENOENT; pthread_rwlock_rdlock(&f->tree_lock); path = get_path(f, ino); if (path != NULL) { struct fuse_intr_data d; if (f->conf.debug) fprintf(stderr, "WRITE%s[%llu] %lu bytes to %llu\n", fi->writepage ? "PAGE" : "", (unsigned long long) fi->fh, (unsigned long) size, (unsigned long long) off); fuse_prepare_interrupt(f, req, &d); res = fuse_fs_write(f->fs, path, buf, size, off, fi); fuse_finish_interrupt(f, req, &d); free(path); } pthread_rwlock_unlock(&f->tree_lock); if (res >= 0) { if (f->conf.debug) fprintf(stderr, " WRITE%s[%llu] %u bytes\n", fi->writepage ? "PAGE" : "", (unsigned long long) fi->fh, res); if ((size_t) res > size) fprintf(stderr, "fuse: wrote too many bytes"); 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 = -ENOENT; pthread_rwlock_rdlock(&f->tree_lock); path = get_path(f, ino); if (path != NULL) { struct fuse_intr_data d; if (f->conf.debug) fprintf(stderr, "FSYNC[%llu]\n", (unsigned long long) fi->fh); fuse_prepare_interrupt(f, req, &d); err = fuse_fs_fsync(f->fs, path, datasync, fi); fuse_finish_interrupt(f, req, &d); free(path); } pthread_rwlock_unlock(&f->tree_lock); 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; fi->fh_old = 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->len = 0; dh->filled = 0; dh->nodeid = ino; fuse_mutex_init(&dh->lock); llfi->fh = (uintptr_t) dh; memset(&fi, 0, sizeof(fi)); fi.flags = llfi->flags; err = -ENOENT; pthread_rwlock_rdlock(&f->tree_lock); path = get_path(f, ino); if (path != NULL) { fuse_prepare_interrupt(f, req, &d); err = fuse_fs_opendir(f->fs, path, &fi); fuse_finish_interrupt(f, req, &d); dh->fh = fi.fh; } if (!err) { if (fuse_reply_open(req, llfi) == -ENOENT) { /* The opendir syscall was interrupted, so it must be cancelled */ fuse_prepare_interrupt(f, req, &d); fuse_fs_releasedir(f->fs, path, &fi); fuse_finish_interrupt(f, req, &d); pthread_mutex_destroy(&dh->lock); free(dh); } } else { reply_err(req, err); pthread_mutex_destroy(&dh->lock); free(dh); } free(path); pthread_rwlock_unlock(&f->tree_lock); } 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 fill_dir(void *dh_, const char *name, const struct stat *statp, off_t off) { struct fuse_dh *dh = (struct fuse_dh *) dh_; struct stat stbuf; size_t newlen; 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) { struct node *node; pthread_mutex_lock(&dh->fuse->lock); node = lookup_node(dh->fuse, dh->nodeid, name); if (node) stbuf.st_ino = (ino_t) node->nodeid; pthread_mutex_unlock(&dh->fuse->lock); } } if (off) { if (extend_contents(dh, dh->needlen) == -1) return 1; dh->filled = 0; 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; } else { newlen = dh->len + fuse_add_direntry(dh->req, NULL, 0, name, NULL, 0); if (extend_contents(dh, newlen) == -1) return 1; fuse_add_direntry(dh->req, dh->contents + dh->len, dh->size - dh->len, name, &stbuf, newlen); } dh->len = newlen; return 0; } 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) { int err = -ENOENT; char *path; pthread_rwlock_rdlock(&f->tree_lock); path = get_path(f, ino); if (path != NULL) { struct fuse_intr_data d; dh->len = 0; dh->error = 0; dh->needlen = size; dh->filled = 1; dh->req = req; fuse_prepare_interrupt(f, req, &d); err = fuse_fs_readdir(f->fs, path, dh, fill_dir, off, fi); fuse_finish_interrupt(f, req, &d); dh->req = NULL; if (!err) err = dh->error; if (err) dh->filled = 0; free(path); } pthread_rwlock_unlock(&f->tree_lock); return err; } static void fuse_lib_readdir(fuse_req_t req, fuse_ino_t ino, size_t size, off_t off, struct fuse_file_info *llfi) { struct fuse *f = req_fuse_prepare(req); struct fuse_file_info fi; struct fuse_dh *dh = get_dirhandle(llfi, &fi); pthread_mutex_lock(&dh->lock); /* According to SUS, directory contents need to be refreshed on rewinddir() */ if (!off) dh->filled = 0; if (!dh->filled) { int err = readdir_fill(f, req, ino, size, off, dh, &fi); if (err) { reply_err(req, err); goto out; } } if (dh->filled) { if (off < dh->len) { if (off + size > dh->len) size = dh->len - off; } else size = 0; } else { size = dh->len; off = 0; } fuse_reply_buf(req, dh->contents + off, size); out: pthread_mutex_unlock(&dh->lock); } 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; pthread_rwlock_rdlock(&f->tree_lock); path = get_path(f, ino); fuse_prepare_interrupt(f, req, &d); fuse_fs_releasedir(f->fs, path ? path : "-", &fi); fuse_finish_interrupt(f, req, &d); if (path) free(path); pthread_rwlock_unlock(&f->tree_lock); pthread_mutex_lock(&dh->lock); pthread_mutex_unlock(&dh->lock); pthread_mutex_destroy(&dh->lock); 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 = -ENOENT; pthread_rwlock_rdlock(&f->tree_lock); path = get_path(f, ino); if (path != NULL) { 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); } pthread_rwlock_unlock(&f->tree_lock); 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; int err; memset(&buf, 0, sizeof(buf)); pthread_rwlock_rdlock(&f->tree_lock); if (!ino) { err = -ENOMEM; path = strdup("/"); } else { err = -ENOENT; path = get_path(f, ino); } if (path) { struct fuse_intr_data d; fuse_prepare_interrupt(f, req, &d); err = fuse_fs_statfs(f->fs, path, &buf); fuse_finish_interrupt(f, req, &d); free(path); } pthread_rwlock_unlock(&f->tree_lock); 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 = -ENOENT; pthread_rwlock_rdlock(&f->tree_lock); path = get_path(f, ino); if (path != NULL) { 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); } pthread_rwlock_unlock(&f->tree_lock); 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 = -ENOENT; pthread_rwlock_rdlock(&f->tree_lock); path = get_path(f, ino); if (path != NULL) { 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); } pthread_rwlock_unlock(&f->tree_lock); 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 = -ENOENT; pthread_rwlock_rdlock(&f->tree_lock); path = get_path(f, ino); if (path != NULL) { 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); } pthread_rwlock_unlock(&f->tree_lock); 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 = -ENOENT; pthread_rwlock_rdlock(&f->tree_lock); path = get_path(f, ino); if (path != NULL) { 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); } pthread_rwlock_unlock(&f->tree_lock); 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; pthread_rwlock_rdlock(&f->tree_lock); path = get_path(f, ino); if (f->conf.debug) fprintf(stderr, "RELEASE%s[%llu] flags: 0x%x\n", fi->flush ? "+FLUSH" : "", (unsigned long long) fi->fh, fi->flags); 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); pthread_rwlock_unlock(&f->tree_lock); 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; pthread_rwlock_rdlock(&f->tree_lock); path = get_path(f, ino); if (path && f->conf.debug) fprintf(stderr, "FLUSH[%llu]\n", (unsigned long long) fi->fh); err = fuse_flush_common(f, req, ino, path, fi); free(path); pthread_rwlock_unlock(&f->tree_lock); 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 = -ENOENT; pthread_rwlock_rdlock(&f->tree_lock); path = get_path(f, ino); if (path != NULL) { 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); } pthread_rwlock_unlock(&f->tree_lock); 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 should_sleep) { int err = fuse_lock_common(req, ino, fi, lock, should_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_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 = -ENOENT; pthread_rwlock_rdlock(&f->tree_lock); path = get_path(f, ino); if (path != NULL) { fuse_prepare_interrupt(f, req, &d); err = fuse_fs_bmap(f->fs, path, blocksize, &idx); fuse_finish_interrupt(f, req, &d); free(path); } pthread_rwlock_unlock(&f->tree_lock); if (!err) fuse_reply_bmap(req, idx); else reply_err(req, err); } static struct fuse_lowlevel_ops fuse_path_ops = { .init = fuse_lib_init, .destroy = fuse_lib_destroy, .lookup = fuse_lib_lookup, .forget = fuse_lib_forget, .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 = fuse_lib_write, .flush = fuse_lib_flush, .release = fuse_lib_release, .fsync = fuse_lib_fsync, .opendir = fuse_lib_opendir, .readdir = fuse_lib_readdir, .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, .bmap = fuse_lib_bmap, }; struct fuse_session *fuse_get_session(struct fuse *f) { return f->se; } int fuse_loop(struct fuse *f) { if (f) return fuse_session_loop(f->se); else return -1; } void fuse_exit(struct fuse *f) { fuse_session_exit(f->se); } struct fuse_context *fuse_get_context(void) { return &fuse_get_context_internal()->ctx; } int fuse_interrupted(void) { return fuse_req_interrupted(fuse_get_context_internal()->req); } enum { KEY_HELP, }; #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("-h", KEY_HELP), FUSE_OPT_KEY("--help", KEY_HELP), 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("hard_remove", hard_remove, 1), FUSE_LIB_OPT("use_ino", use_ino, 1), FUSE_LIB_OPT("readdir_ino", readdir_ino, 1), FUSE_LIB_OPT("direct_io", direct_io, 1), FUSE_LIB_OPT("kernel_cache", kernel_cache, 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("intr", intr, 1), FUSE_LIB_OPT("intr_signal=%d", intr_signal, 0), FUSE_OPT_END }; static void fuse_lib_help(void) { fprintf(stderr, " -o hard_remove immediate removal (don't hide files)\n" " -o use_ino let filesystem set inode numbers\n" " -o readdir_ino try to fill in d_ino in readdir\n" " -o direct_io use direct I/O\n" " -o kernel_cache cache files in kernel\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 intr allow requests to be interrupted\n" " -o intr_signal=NUM signal to send on interrupt (%i)\n" "\n", FUSE_DEFAULT_INTR_SIGNAL); } static int fuse_lib_opt_proc(void *data, const char *arg, int key, struct fuse_args *outargs) { (void) arg; (void) outargs; if (key == KEY_HELP) { struct fuse_config *conf = (struct fuse_config *) data; fuse_lib_help(); conf->help = 1; } return 1; } 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); } 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) { fprintf(stderr, "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) { fprintf(stderr, "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; } struct fuse *fuse_new(struct fuse_chan *ch, struct fuse_args *args, const struct fuse_operations *op, size_t op_size, void *user_data) { struct fuse *f; struct node *root; struct fuse_fs *fs; struct fuse_lowlevel_ops llop = fuse_path_ops; if (fuse_create_context_key() == -1) goto out; f = (struct fuse *) calloc(1, sizeof(struct fuse)); if (f == NULL) { fprintf(stderr, "fuse: failed to allocate fuse object\n"); goto out_delete_context_key; } fs = fuse_fs_new(op, op_size, user_data); if (!fs) goto out_free; f->fs = fs; f->utime_omit_ok = fs->op.flag_utime_omit_ok; /* Oh f**k, this is ugly! */ if (!fs->op.lock) { llop.getlk = NULL; llop.setlk = NULL; } 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; if (fuse_opt_parse(args, &f->conf, fuse_lib_opts, fuse_lib_opt_proc) == -1) goto out_free_fs; if (!f->conf.ac_attr_timeout_set) f->conf.ac_attr_timeout = f->conf.attr_timeout; #ifdef __FreeBSD__ /* * 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_lowlevel_new(args, &llop, sizeof(llop), f); if (f->se == NULL) { goto out_free_fs; } fuse_session_add_chan(f->se, ch); if (f->conf.debug) fprintf(stderr, "utime_omit_ok: %i\n", f->utime_omit_ok); f->ctr = 0; f->generation = 0; /* FIXME: Dynamic hash table */ f->name_table_size = 14057; f->name_table = (struct node **) calloc(1, sizeof(struct node *) * f->name_table_size); if (f->name_table == NULL) { fprintf(stderr, "fuse: memory allocation failed\n"); goto out_free_session; } f->id_table_size = 14057; f->id_table = (struct node **) calloc(1, sizeof(struct node *) * f->id_table_size); if (f->id_table == NULL) { fprintf(stderr, "fuse: memory allocation failed\n"); goto out_free_name_table; } fuse_mutex_init(&f->lock); pthread_rwlock_init(&f->tree_lock, NULL); root = (struct node *) calloc(1, sizeof(struct node)); if (root == NULL) { fprintf(stderr, "fuse: memory allocation failed\n"); goto out_free_id_table; } root->name = strdup("/"); if (root->name == NULL) { fprintf(stderr, "fuse: memory allocation failed\n"); goto out_free_root; } if (f->conf.intr && fuse_init_intr_signal(f->conf.intr_signal, &f->intr_installed) == -1) goto out_free_root_name; root->parent = NULL; root->nodeid = FUSE_ROOT_ID; root->generation = 0; root->refctr = 1; root->nlookup = 1; hash_id(f, root); return f; out_free_root_name: free(root->name); out_free_root: free(root); out_free_id_table: free(f->id_table); out_free_name_table: free(f->name_table); out_free_session: fuse_session_destroy(f->se); out_free_fs: /* Horrible compatibility hack to stop the destructor from being called on the filesystem without init being called first */ fs->op.destroy = NULL; fuse_fs_destroy(f->fs); out_free: free(f); out_delete_context_key: fuse_delete_context_key(); out: return NULL; } 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) { struct fuse_context_i *c = fuse_get_context_internal(); memset(c, 0, sizeof(*c)); c->ctx.fuse = f; for (i = 0; i < f->id_table_size; i++) { struct node *node; for (node = f->id_table[i]; node != NULL; node = node->id_next) { if (node->is_hidden) { char *path = get_path(f, node->nodeid); if (path) { 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[i]; node != NULL; node = next) { next = node->id_next; free_node(node); } } free(f->id_table); free(f->name_table); pthread_mutex_destroy(&f->lock); pthread_rwlock_destroy(&f->tree_lock); fuse_session_destroy(f->se); free(f); fuse_delete_context_key(); }