/* 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 */ #define _GNU_SOURCE #include "lfmp.h" #include "config.h" #include "debug.h" #include "fuse_i.h" #include "fuse_kernel.h" #include "fuse_opt.h" #include "fuse_misc.h" #include "fuse_pollhandle.h" #include "fuse_msgbuf.hpp" #include #include #include #include #include #include #include #include #include #ifndef F_LINUX_SPECIFIC_BASE #define F_LINUX_SPECIFIC_BASE 1024 #endif #ifndef F_SETPIPE_SZ #define F_SETPIPE_SZ (F_LINUX_SPECIFIC_BASE + 7) #endif #define PARAM(inarg) (((char*)(inarg)) + sizeof(*(inarg))) #define OFFSET_MAX 0x7fffffffffffffffLL #define container_of(ptr, type, member) ({ \ const typeof( ((type*)0)->member ) *__mptr = (ptr); \ (type *)( (char*)__mptr - offsetof(type,member) );}) static size_t pagesize; static lfmp_t g_FMP_fuse_req; static __attribute__((constructor)) void fuse_ll_constructor(void) { pagesize = sysconf(_SC_PAGESIZE); lfmp_init(&g_FMP_fuse_req,sizeof(struct fuse_req),1); } static __attribute__((destructor)) void fuse_ll_destructor(void) { lfmp_destroy(&g_FMP_fuse_req); } static void convert_stat(const struct stat *stbuf_, struct fuse_attr *attr_) { attr_->ino = stbuf_->st_ino; attr_->mode = stbuf_->st_mode; attr_->nlink = stbuf_->st_nlink; attr_->uid = stbuf_->st_uid; attr_->gid = stbuf_->st_gid; attr_->rdev = stbuf_->st_rdev; attr_->size = stbuf_->st_size; attr_->blksize = stbuf_->st_blksize; attr_->blocks = stbuf_->st_blocks; attr_->atime = stbuf_->st_atime; attr_->mtime = stbuf_->st_mtime; attr_->ctime = stbuf_->st_ctime; attr_->atimensec = ST_ATIM_NSEC(stbuf_); attr_->mtimensec = ST_MTIM_NSEC(stbuf_); attr_->ctimensec = ST_CTIM_NSEC(stbuf_); } static size_t iov_length(const struct iovec *iov, size_t count) { size_t seg; size_t ret = 0; for(seg = 0; seg < count; seg++) ret += iov[seg].iov_len; return ret; } static void destroy_req(fuse_req_t req) { lfmp_free(&g_FMP_fuse_req,req); } static struct fuse_req* fuse_ll_alloc_req(struct fuse_ll *f) { struct fuse_req *req; req = (struct fuse_req*)lfmp_calloc(&g_FMP_fuse_req); if(req == NULL) { fprintf(stderr, "fuse: failed to allocate request\n"); } else { req->f = f; } return req; } static int fuse_send_msg(struct fuse_ll *f, struct fuse_chan *ch, struct iovec *iov, int count) { int rv; struct fuse_out_header *out = iov[0].iov_base; out->len = iov_length(iov, count); rv = writev(fuse_chan_fd(ch),iov,count); if(rv == -1) return -errno; return 0; } #define MAX_ERRNO 4095 int fuse_send_reply_iov_nofree(fuse_req_t req, int error, struct iovec *iov, int count) { struct fuse_out_header out; if(error > 0) error = -error; if(error <= -MAX_ERRNO) { fprintf(stderr,"fuse: bad error value: %i\n",error); error = -ERANGE; } out.unique = req->unique; out.error = error; iov[0].iov_base = &out; iov[0].iov_len = sizeof(struct fuse_out_header); return fuse_send_msg(req->f, req->ch, iov, count); } static int send_reply_iov(fuse_req_t req, int error, struct iovec *iov, int count) { int res; res = fuse_send_reply_iov_nofree(req, error, iov, count); destroy_req(req); return res; } static int send_reply(fuse_req_t req, int error, const void *arg, size_t argsize) { struct iovec iov[2]; int count = 1; if(argsize) { iov[1].iov_base = (void *) arg; iov[1].iov_len = argsize; count++; } return send_reply_iov(req, error, iov, count); } static void convert_statfs(const struct statvfs *stbuf, struct fuse_kstatfs *kstatfs) { kstatfs->bsize = stbuf->f_bsize; kstatfs->frsize = stbuf->f_frsize; kstatfs->blocks = stbuf->f_blocks; kstatfs->bfree = stbuf->f_bfree; kstatfs->bavail = stbuf->f_bavail; kstatfs->files = stbuf->f_files; kstatfs->ffree = stbuf->f_ffree; kstatfs->namelen = stbuf->f_namemax; } static int send_reply_ok(fuse_req_t req, const void *arg, size_t argsize) { return send_reply(req, 0, arg, argsize); } int fuse_reply_err(fuse_req_t req_, int err_) { return send_reply(req_,err_,NULL,0); } void fuse_reply_none(fuse_req_t req) { destroy_req(req); } static void fill_entry(struct fuse_entry_out *arg, const struct fuse_entry_param *e) { arg->nodeid = e->ino; arg->generation = e->generation; arg->entry_valid = e->timeout.entry; arg->entry_valid_nsec = 0; arg->attr_valid = e->timeout.attr; arg->attr_valid_nsec = 0; convert_stat(&e->attr,&arg->attr); } static void fill_open(struct fuse_open_out *arg_, const fuse_file_info_t *ffi_) { arg_->fh = ffi_->fh; if(ffi_->direct_io) arg_->open_flags |= FOPEN_DIRECT_IO; if(ffi_->keep_cache) arg_->open_flags |= FOPEN_KEEP_CACHE; if(ffi_->nonseekable) arg_->open_flags |= FOPEN_NONSEEKABLE; if(ffi_->cache_readdir) arg_->open_flags |= FOPEN_CACHE_DIR; if(ffi_->parallel_direct_writes) arg_->open_flags |= FOPEN_PARALLEL_DIRECT_WRITES; if(ffi_->noflush) arg_->open_flags |= FOPEN_NOFLUSH; } int fuse_reply_entry(fuse_req_t req, const struct fuse_entry_param *e) { struct fuse_entry_out arg = {0}; size_t size = req->f->conn.proto_minor < 9 ? FUSE_COMPAT_ENTRY_OUT_SIZE : sizeof(arg); /* before ABI 7.4 e->ino == 0 was invalid, only ENOENT meant negative entry */ if(!e->ino && req->f->conn.proto_minor < 4) return fuse_reply_err(req, ENOENT); fill_entry(&arg, e); #ifdef NDEBUG // TODO: Add checks for cases where a node could be marked bad by // the kernel. #endif return send_reply_ok(req, &arg, size); } struct fuse_create_out { struct fuse_entry_out e; struct fuse_open_out o; }; int fuse_reply_create(fuse_req_t req, const struct fuse_entry_param *e, const fuse_file_info_t *f) { struct fuse_create_out buf = {0}; size_t entrysize = req->f->conn.proto_minor < 9 ? FUSE_COMPAT_ENTRY_OUT_SIZE : sizeof(struct fuse_entry_out); struct fuse_entry_out *earg = (struct fuse_entry_out*)&buf.e; struct fuse_open_out *oarg = (struct fuse_open_out*)(((char*)&buf)+entrysize); fill_entry(earg, e); fill_open(oarg, f); return send_reply_ok(req, &buf, entrysize + sizeof(struct fuse_open_out)); } int fuse_reply_attr(fuse_req_t req, const struct stat *attr, const uint64_t timeout) { struct fuse_attr_out arg = {0}; size_t size = req->f->conn.proto_minor < 9 ? FUSE_COMPAT_ATTR_OUT_SIZE : sizeof(arg); arg.attr_valid = timeout; arg.attr_valid_nsec = 0; convert_stat(attr,&arg.attr); return send_reply_ok(req,&arg,size); } int fuse_reply_readlink(fuse_req_t req, const char *linkname) { return send_reply_ok(req, linkname, strlen(linkname)); } int fuse_reply_open(fuse_req_t req, const fuse_file_info_t *f) { struct fuse_open_out arg = {0}; fill_open(&arg, f); return send_reply_ok(req, &arg, sizeof(arg)); } int fuse_reply_write(fuse_req_t req, size_t count) { struct fuse_write_out arg = {0}; arg.size = count; return send_reply_ok(req, &arg, sizeof(arg)); } int fuse_reply_buf(fuse_req_t req, const char *buf, size_t size) { return send_reply_ok(req, buf, size); } static int fuse_send_data_iov_fallback(struct fuse_ll *f, struct fuse_chan *ch, struct iovec *iov, int iov_count, struct fuse_bufvec *buf, size_t len) { int res; struct fuse_bufvec mem_buf = FUSE_BUFVEC_INIT(len); /* Optimize common case */ if(buf->count == 1 && buf->idx == 0 && buf->off == 0 && !(buf->buf[0].flags & FUSE_BUF_IS_FD)) { /* FIXME: also avoid memory copy if there are multiple buffers but none of them contain an fd */ iov[iov_count].iov_base = buf->buf[0].mem; iov[iov_count].iov_len = len; iov_count++; return fuse_send_msg(f, ch, iov, iov_count); } fuse_msgbuf_t *msgbuf; msgbuf = msgbuf_alloc(); if(msgbuf == NULL) return -ENOMEM; mem_buf.buf[0].mem = msgbuf->mem; res = fuse_buf_copy(&mem_buf, buf, 0); if(res < 0) { msgbuf_free(msgbuf); return -res; } len = res; iov[iov_count].iov_base = msgbuf->mem; iov[iov_count].iov_len = len; iov_count++; res = fuse_send_msg(f, ch, iov, iov_count); msgbuf_free(msgbuf); return res; } struct fuse_ll_pipe { size_t size; int can_grow; int pipe[2]; }; static void fuse_ll_pipe_free(struct fuse_ll_pipe *llp) { close(llp->pipe[0]); close(llp->pipe[1]); free(llp); } static int fuse_send_data_iov(struct fuse_ll *f, struct fuse_chan *ch, struct iovec *iov, int iov_count, struct fuse_bufvec *buf, unsigned int flags) { size_t len = fuse_buf_size(buf); (void) flags; return fuse_send_data_iov_fallback(f, ch, iov, iov_count, buf, len); } int fuse_reply_data(fuse_req_t req, char *buf_, const size_t bufsize_) { int res; struct iovec iov[2]; struct fuse_out_header out; iov[0].iov_base = &out; iov[0].iov_len = sizeof(struct fuse_out_header); iov[1].iov_base = buf_; iov[1].iov_len = bufsize_; out.unique = req->unique; out.error = 0; res = fuse_send_msg(req->f,req->ch,iov,2); if(res <= 0) { destroy_req(req); return res; } else { return fuse_reply_err(req, res); } } int fuse_reply_statfs(fuse_req_t req, const struct statvfs *stbuf) { struct fuse_statfs_out arg = {0}; size_t size = req->f->conn.proto_minor < 4 ? FUSE_COMPAT_STATFS_SIZE : sizeof(arg); convert_statfs(stbuf, &arg.st); return send_reply_ok(req, &arg, size); } int fuse_reply_xattr(fuse_req_t req, size_t count) { struct fuse_getxattr_out arg = {0}; arg.size = count; return send_reply_ok(req, &arg, sizeof(arg)); } int fuse_reply_lock(fuse_req_t req, const struct flock *lock) { struct fuse_lk_out arg = {0}; arg.lk.type = lock->l_type; if(lock->l_type != F_UNLCK) { arg.lk.start = lock->l_start; if(lock->l_len == 0) arg.lk.end = OFFSET_MAX; else arg.lk.end = lock->l_start + lock->l_len - 1; } arg.lk.pid = lock->l_pid; return send_reply_ok(req, &arg, sizeof(arg)); } int fuse_reply_bmap(fuse_req_t req, uint64_t idx) { struct fuse_bmap_out arg = {0}; arg.block = idx; return send_reply_ok(req, &arg, sizeof(arg)); } static struct fuse_ioctl_iovec* fuse_ioctl_iovec_copy(const struct iovec *iov, size_t count) { struct fuse_ioctl_iovec *fiov; size_t i; fiov = malloc(sizeof(fiov[0]) * count); if(!fiov) return NULL; for (i = 0; i < count; i++) { fiov[i].base = (uintptr_t) iov[i].iov_base; fiov[i].len = iov[i].iov_len; } return fiov; } int fuse_reply_ioctl_retry(fuse_req_t req, const struct iovec *in_iov, size_t in_count, const struct iovec *out_iov, size_t out_count) { struct fuse_ioctl_out arg = {0}; struct fuse_ioctl_iovec *in_fiov = NULL; struct fuse_ioctl_iovec *out_fiov = NULL; struct iovec iov[4]; size_t count = 1; int res; arg.flags |= FUSE_IOCTL_RETRY; arg.in_iovs = in_count; arg.out_iovs = out_count; iov[count].iov_base = &arg; iov[count].iov_len = sizeof(arg); count++; if(req->f->conn.proto_minor < 16) { if(in_count) { iov[count].iov_base = (void *)in_iov; iov[count].iov_len = sizeof(in_iov[0]) * in_count; count++; } if(out_count) { iov[count].iov_base = (void *)out_iov; iov[count].iov_len = sizeof(out_iov[0]) * out_count; count++; } } else { /* Can't handle non-compat 64bit ioctls on 32bit */ if((sizeof(void *) == 4) && (req->ioctl_64bit)) { res = fuse_reply_err(req, EINVAL); goto out; } if(in_count) { in_fiov = fuse_ioctl_iovec_copy(in_iov, in_count); if(!in_fiov) goto enomem; iov[count].iov_base = (void *)in_fiov; iov[count].iov_len = sizeof(in_fiov[0]) * in_count; count++; } if(out_count) { out_fiov = fuse_ioctl_iovec_copy(out_iov, out_count); if(!out_fiov) goto enomem; iov[count].iov_base = (void *)out_fiov; iov[count].iov_len = sizeof(out_fiov[0]) * out_count; count++; } } res = send_reply_iov(req, 0, iov, count); out: free(in_fiov); free(out_fiov); return res; enomem: res = fuse_reply_err(req, ENOMEM); goto out; } int fuse_reply_ioctl(fuse_req_t req, int result, const void *buf, uint32_t size) { int count; struct iovec iov[3]; struct fuse_ioctl_out arg; arg.result = result; arg.flags = 0; arg.in_iovs = 0; arg.out_iovs = 0; count = 1; iov[count].iov_base = &arg; iov[count].iov_len = sizeof(arg); count++; if(size) { iov[count].iov_base = (char*)buf; iov[count].iov_len = size; count++; } return send_reply_iov(req, 0, iov, count); } int fuse_reply_ioctl_iov(fuse_req_t req, int result, const struct iovec *iov, int count) { struct iovec *padded_iov; struct fuse_ioctl_out arg = {0}; int res; padded_iov = malloc((count + 2) * sizeof(struct iovec)); if(padded_iov == NULL) return fuse_reply_err(req, ENOMEM); arg.result = result; padded_iov[1].iov_base = &arg; padded_iov[1].iov_len = sizeof(arg); memcpy(&padded_iov[2], iov, count * sizeof(struct iovec)); res = send_reply_iov(req, 0, padded_iov, count + 2); free(padded_iov); return res; } int fuse_reply_poll(fuse_req_t req, unsigned revents) { struct fuse_poll_out arg = {0}; arg.revents = revents; return send_reply_ok(req, &arg, sizeof(arg)); } static void do_lookup(fuse_req_t req, struct fuse_in_header *hdr_) { req->f->op.lookup(req,hdr_); } static void do_forget(fuse_req_t req, struct fuse_in_header *hdr_) { req->f->op.forget(req,hdr_); } static void do_batch_forget(fuse_req_t req, struct fuse_in_header *hdr_) { req->f->op.forget_multi(req,hdr_); } static void do_getattr(fuse_req_t req, struct fuse_in_header *hdr_) { req->f->op.getattr(req, hdr_); } static void do_setattr(fuse_req_t req_, struct fuse_in_header *hdr_) { req_->f->op.setattr(req_,hdr_); } static void do_access(fuse_req_t req, struct fuse_in_header *hdr_) { req->f->op.access(req,hdr_); } static void do_readlink(fuse_req_t req, struct fuse_in_header *hdr_) { req->f->op.readlink(req,hdr_); } static void do_mknod(fuse_req_t req, struct fuse_in_header *hdr_) { req->f->op.mknod(req,hdr_); } static void do_mkdir(fuse_req_t req, struct fuse_in_header *hdr_) { req->f->op.mkdir(req,hdr_); } static void do_unlink(fuse_req_t req, struct fuse_in_header *hdr_) { req->f->op.unlink(req,hdr_); } static void do_rmdir(fuse_req_t req, struct fuse_in_header *hdr_) { req->f->op.rmdir(req,hdr_); } static void do_symlink(fuse_req_t req, struct fuse_in_header *hdr_) { req->f->op.symlink(req,hdr_); } static void do_rename(fuse_req_t req, struct fuse_in_header *hdr_) { req->f->op.rename(req,hdr_); } static void do_link(fuse_req_t req, struct fuse_in_header *hdr_) { req->f->op.link(req,hdr_); } static void do_create(fuse_req_t req, struct fuse_in_header *hdr_) { req->f->op.create(req,hdr_); } static void do_open(fuse_req_t req, struct fuse_in_header *hdr_) { req->f->op.open(req,hdr_); } static void do_read(fuse_req_t req, struct fuse_in_header *hdr_) { req->f->op.read(req,hdr_); } static void do_write(fuse_req_t req, struct fuse_in_header *hdr_) { req->f->op.write(req,hdr_); } static void do_flush(fuse_req_t req, struct fuse_in_header *hdr_) { req->f->op.flush(req,hdr_); } static void do_release(fuse_req_t req, struct fuse_in_header *hdr_) { req->f->op.release(req,hdr_); } static void do_fsync(fuse_req_t req, struct fuse_in_header *hdr_) { req->f->op.fsync(req,hdr_); } static void do_opendir(fuse_req_t req, struct fuse_in_header *hdr_) { req->f->op.opendir(req,hdr_); } static void do_readdir(fuse_req_t req, struct fuse_in_header *hdr_) { req->f->op.readdir(req,hdr_); } static void do_readdir_plus(fuse_req_t req_, struct fuse_in_header *hdr_) { req_->f->op.readdir_plus(req_,hdr_); } static void do_releasedir(fuse_req_t req, struct fuse_in_header *hdr_) { req->f->op.releasedir(req,hdr_); } static void do_fsyncdir(fuse_req_t req, struct fuse_in_header *hdr_) { req->f->op.fsyncdir(req,hdr_); } static void do_statfs(fuse_req_t req, struct fuse_in_header *hdr_) { req->f->op.statfs(req,hdr_); } static void do_setxattr(fuse_req_t req, struct fuse_in_header *hdr_) { req->f->op.setxattr(req,hdr_); } static void do_getxattr(fuse_req_t req, struct fuse_in_header *hdr_) { req->f->op.getxattr(req,hdr_); } static void do_listxattr(fuse_req_t req, struct fuse_in_header *hdr_) { req->f->op.listxattr(req,hdr_); } static void do_removexattr(fuse_req_t req, struct fuse_in_header *hdr_) { req->f->op.removexattr(req,hdr_); } static void convert_fuse_file_lock(struct fuse_file_lock *fl, struct flock *flock) { memset(flock, 0, sizeof(struct flock)); flock->l_type = fl->type; flock->l_whence = SEEK_SET; flock->l_start = fl->start; if(fl->end == OFFSET_MAX) flock->l_len = 0; else flock->l_len = fl->end - fl->start + 1; flock->l_pid = fl->pid; } static void do_getlk(fuse_req_t req, struct fuse_in_header *hdr_) { req->f->op.getlk(req,hdr_); } static void do_setlk_common(fuse_req_t req, uint64_t nodeid, const void *inarg, int sleep) { struct flock flock; fuse_file_info_t fi = {0}; struct fuse_lk_in *arg = (struct fuse_lk_in*)inarg; fi.fh = arg->fh; fi.lock_owner = arg->owner; if(arg->lk_flags & FUSE_LK_FLOCK) { int op = 0; switch (arg->lk.type) { case F_RDLCK: op = LOCK_SH; break; case F_WRLCK: op = LOCK_EX; break; case F_UNLCK: op = LOCK_UN; break; } if(!sleep) op |= LOCK_NB; req->f->op.flock(req,nodeid,&fi,op); } else { convert_fuse_file_lock(&arg->lk, &flock); req->f->op.setlk(req,nodeid,&fi,&flock,sleep); } } static void do_setlk(fuse_req_t req, struct fuse_in_header *hdr_) { do_setlk_common(req, hdr_->nodeid, &hdr_[1], 0); } static void do_setlkw(fuse_req_t req, struct fuse_in_header *hdr_) { do_setlk_common(req, hdr_->nodeid, &hdr_[1], 1); } static void do_interrupt(fuse_req_t req, struct fuse_in_header *hdr_) { destroy_req(req); } static void do_bmap(fuse_req_t req, struct fuse_in_header *hdr_) { req->f->op.bmap(req,hdr_); } static void do_ioctl(fuse_req_t req, struct fuse_in_header *hdr_) { req->f->op.ioctl(req, hdr_); } void fuse_pollhandle_destroy(fuse_pollhandle_t *ph) { free(ph); } static void do_poll(fuse_req_t req, struct fuse_in_header *hdr_) { req->f->op.poll(req,hdr_); } static void do_fallocate(fuse_req_t req, struct fuse_in_header *hdr_) { req->f->op.fallocate(req,hdr_); } static void do_init(fuse_req_t req, struct fuse_in_header *hdr_) { struct fuse_init_out outarg = {0}; struct fuse_init_in *arg = (struct fuse_init_in *) &hdr_[1]; struct fuse_ll *f = req->f; size_t bufsize = fuse_chan_bufsize(req->ch); if(f->debug) debug_fuse_init_in(arg); f->conn.proto_major = arg->major; f->conn.proto_minor = arg->minor; f->conn.capable = 0; f->conn.want = 0; outarg.major = FUSE_KERNEL_VERSION; outarg.minor = FUSE_KERNEL_MINOR_VERSION; outarg.max_pages = FUSE_DEFAULT_MAX_PAGES_PER_REQ; if(arg->major < 7) { fprintf(stderr, "fuse: unsupported protocol version: %u.%u\n", arg->major, arg->minor); fuse_reply_err(req, EPROTO); return; } if(arg->major > 7) { /* Wait for a second INIT request with a 7.X version */ send_reply_ok(req, &outarg, sizeof(outarg)); return; } if(arg->minor >= 6) { if(arg->max_readahead < f->conn.max_readahead) f->conn.max_readahead = arg->max_readahead; if(arg->flags & FUSE_ASYNC_READ) f->conn.capable |= FUSE_CAP_ASYNC_READ; if(arg->flags & FUSE_POSIX_LOCKS) f->conn.capable |= FUSE_CAP_POSIX_LOCKS; if(arg->flags & FUSE_ATOMIC_O_TRUNC) f->conn.capable |= FUSE_CAP_ATOMIC_O_TRUNC; if(arg->flags & FUSE_EXPORT_SUPPORT) f->conn.capable |= FUSE_CAP_EXPORT_SUPPORT; if(arg->flags & FUSE_BIG_WRITES) f->conn.capable |= FUSE_CAP_BIG_WRITES; if(arg->flags & FUSE_DONT_MASK) f->conn.capable |= FUSE_CAP_DONT_MASK; if(arg->flags & FUSE_FLOCK_LOCKS) f->conn.capable |= FUSE_CAP_FLOCK_LOCKS; if(arg->flags & FUSE_POSIX_ACL) f->conn.capable |= FUSE_CAP_POSIX_ACL; if(arg->flags & FUSE_CACHE_SYMLINKS) f->conn.capable |= FUSE_CAP_CACHE_SYMLINKS; if(arg->flags & FUSE_ASYNC_DIO) f->conn.capable |= FUSE_CAP_ASYNC_DIO; if(arg->flags & FUSE_PARALLEL_DIROPS) f->conn.capable |= FUSE_CAP_PARALLEL_DIROPS; if(arg->flags & FUSE_MAX_PAGES) f->conn.capable |= FUSE_CAP_MAX_PAGES; if(arg->flags & FUSE_WRITEBACK_CACHE) f->conn.capable |= FUSE_CAP_WRITEBACK_CACHE; if(arg->flags & FUSE_DO_READDIRPLUS) f->conn.capable |= FUSE_CAP_READDIR_PLUS; if(arg->flags & FUSE_READDIRPLUS_AUTO) f->conn.capable |= FUSE_CAP_READDIR_PLUS_AUTO; if(arg->flags & FUSE_SETXATTR_EXT) f->conn.capable |= FUSE_CAP_SETXATTR_EXT; } else { f->conn.want &= ~FUSE_CAP_ASYNC_READ; f->conn.max_readahead = 0; } if(req->f->conn.proto_minor >= 18) f->conn.capable |= FUSE_CAP_IOCTL_DIR; if(f->op.getlk && f->op.setlk && !f->no_remote_posix_lock) f->conn.want |= FUSE_CAP_POSIX_LOCKS; if(f->op.flock && !f->no_remote_flock) f->conn.want |= FUSE_CAP_FLOCK_LOCKS; if(bufsize < FUSE_MIN_READ_BUFFER) { fprintf(stderr, "fuse: warning: buffer size too small: %zu\n", bufsize); bufsize = FUSE_MIN_READ_BUFFER; } bufsize -= pagesize; if(bufsize < f->conn.max_write) f->conn.max_write = bufsize; f->got_init = 1; if(f->op.init) f->op.init(f->userdata, &f->conn); if((arg->flags & FUSE_MAX_PAGES) && (f->conn.want & FUSE_CAP_MAX_PAGES)) { outarg.flags |= FUSE_MAX_PAGES; outarg.max_pages = f->conn.max_pages; msgbuf_set_bufsize(outarg.max_pages + 1); } if(f->conn.want & FUSE_CAP_ASYNC_READ) outarg.flags |= FUSE_ASYNC_READ; if(f->conn.want & FUSE_CAP_POSIX_LOCKS) outarg.flags |= FUSE_POSIX_LOCKS; if(f->conn.want & FUSE_CAP_ATOMIC_O_TRUNC) outarg.flags |= FUSE_ATOMIC_O_TRUNC; if(f->conn.want & FUSE_CAP_EXPORT_SUPPORT) outarg.flags |= FUSE_EXPORT_SUPPORT; if(f->conn.want & FUSE_CAP_BIG_WRITES) outarg.flags |= FUSE_BIG_WRITES; if(f->conn.want & FUSE_CAP_DONT_MASK) outarg.flags |= FUSE_DONT_MASK; if(f->conn.want & FUSE_CAP_FLOCK_LOCKS) outarg.flags |= FUSE_FLOCK_LOCKS; if(f->conn.want & FUSE_CAP_POSIX_ACL) outarg.flags |= FUSE_POSIX_ACL; if(f->conn.want & FUSE_CAP_CACHE_SYMLINKS) outarg.flags |= FUSE_CACHE_SYMLINKS; if(f->conn.want & FUSE_CAP_ASYNC_DIO) outarg.flags |= FUSE_ASYNC_DIO; if(f->conn.want & FUSE_CAP_PARALLEL_DIROPS) outarg.flags |= FUSE_PARALLEL_DIROPS; if(f->conn.want & FUSE_CAP_WRITEBACK_CACHE) outarg.flags |= FUSE_WRITEBACK_CACHE; if(f->conn.want & FUSE_CAP_READDIR_PLUS) outarg.flags |= FUSE_DO_READDIRPLUS; if(f->conn.want & FUSE_CAP_READDIR_PLUS_AUTO) outarg.flags |= FUSE_READDIRPLUS_AUTO; if(f->conn.want & FUSE_CAP_SETXATTR_EXT) outarg.flags |= FUSE_SETXATTR_EXT; outarg.max_readahead = f->conn.max_readahead; outarg.max_write = f->conn.max_write; if(f->conn.proto_minor >= 13) { if(f->conn.max_background >= (1 << 16)) f->conn.max_background = (1 << 16) - 1; if(f->conn.congestion_threshold > f->conn.max_background) f->conn.congestion_threshold = f->conn.max_background; if(!f->conn.congestion_threshold) { f->conn.congestion_threshold = f->conn.max_background * 3 / 4; } outarg.max_background = f->conn.max_background; outarg.congestion_threshold = f->conn.congestion_threshold; } size_t outargsize; if(arg->minor < 5) outargsize = FUSE_COMPAT_INIT_OUT_SIZE; else if(arg->minor < 23) outargsize = FUSE_COMPAT_22_INIT_OUT_SIZE; else outargsize = sizeof(outarg); if(f->debug) debug_fuse_init_out(req->unique,&outarg,outargsize); send_reply_ok(req, &outarg, outargsize); } static void do_destroy(fuse_req_t req, struct fuse_in_header *hdr_) { struct fuse_ll *f = req->f; f->got_destroy = 1; f->op.destroy(f->userdata); send_reply_ok(req,NULL,0); } static void list_del_nreq(struct fuse_notify_req *nreq) { struct fuse_notify_req *prev = nreq->prev; struct fuse_notify_req *next = nreq->next; prev->next = next; next->prev = prev; } static void list_add_nreq(struct fuse_notify_req *nreq, struct fuse_notify_req *next) { struct fuse_notify_req *prev = next->prev; nreq->next = next; nreq->prev = prev; prev->next = nreq; next->prev = nreq; } static void list_init_nreq(struct fuse_notify_req *nreq) { nreq->next = nreq; nreq->prev = nreq; } static void do_notify_reply(fuse_req_t req, struct fuse_in_header *hdr_) { struct fuse_ll *f = req->f; struct fuse_notify_req *nreq; struct fuse_notify_req *head; pthread_mutex_lock(&f->lock); head = &f->notify_list; for(nreq = head->next; nreq != head; nreq = nreq->next) { if(nreq->unique == req->unique) { list_del_nreq(nreq); break; } } pthread_mutex_unlock(&f->lock); if(nreq != head) nreq->reply(nreq, req, hdr_->nodeid, &hdr_[1]); } static void do_copy_file_range(fuse_req_t req_, struct fuse_in_header *hdr_) { req_->f->op.copy_file_range(req_,hdr_); } static void do_setupmapping(fuse_req_t req_, struct fuse_in_header *hdr_) { printf("setupmapping\n"); req_->f->op.setupmapping(req_,hdr_); } static void do_removemapping(fuse_req_t req_, struct fuse_in_header *hdr_) { printf("removemapping\n"); req_->f->op.removemapping(req_,hdr_); } static void do_syncfs(fuse_req_t req_, struct fuse_in_header *hdr_) { printf("syncfs\n"); req_->f->op.syncfs(req_,hdr_); } static void do_tmpfile(fuse_req_t req_, struct fuse_in_header *hdr_) { printf("tmpfile\n"); req_->f->op.tmpfile(req_,hdr_); } static int send_notify_iov(struct fuse_ll *f, struct fuse_chan *ch, int notify_code, struct iovec *iov, int count) { struct fuse_out_header out; if(!f->got_init) return -ENOTCONN; out.unique = 0; out.error = notify_code; iov[0].iov_base = &out; iov[0].iov_len = sizeof(struct fuse_out_header); return fuse_send_msg(f, ch, iov, count); } int fuse_lowlevel_notify_poll(fuse_pollhandle_t *ph) { if(ph != NULL) { struct fuse_notify_poll_wakeup_out outarg; struct iovec iov[2]; outarg.kh = ph->kh; iov[1].iov_base = &outarg; iov[1].iov_len = sizeof(outarg); return send_notify_iov(ph->f, ph->ch, FUSE_NOTIFY_POLL, iov, 2); } else { return 0; } } int fuse_lowlevel_notify_inval_inode(struct fuse_chan *ch, uint64_t ino, off_t off, off_t len) { struct fuse_notify_inval_inode_out outarg; struct fuse_ll *f; struct iovec iov[2]; if(!ch) return -EINVAL; f = (struct fuse_ll*)fuse_session_data(fuse_chan_session(ch)); if(!f) return -ENODEV; outarg.ino = ino; outarg.off = off; outarg.len = len; iov[1].iov_base = &outarg; iov[1].iov_len = sizeof(outarg); return send_notify_iov(f, ch, FUSE_NOTIFY_INVAL_INODE, iov, 2); } int fuse_lowlevel_notify_inval_entry(struct fuse_chan *ch, uint64_t parent, const char *name, size_t namelen) { struct fuse_notify_inval_entry_out outarg; struct fuse_ll *f; struct iovec iov[3]; if(!ch) return -EINVAL; f = (struct fuse_ll*)fuse_session_data(fuse_chan_session(ch)); if(!f) return -ENODEV; outarg.parent = parent; outarg.namelen = namelen; // TODO: Add ability to set `flags` outarg.flags = 0; iov[1].iov_base = &outarg; iov[1].iov_len = sizeof(outarg); iov[2].iov_base = (void *)name; iov[2].iov_len = namelen + 1; return send_notify_iov(f, ch, FUSE_NOTIFY_INVAL_ENTRY, iov, 3); } int fuse_lowlevel_notify_delete(struct fuse_chan *ch, uint64_t parent, uint64_t child, const char *name, size_t namelen) { struct fuse_notify_delete_out outarg; struct fuse_ll *f; struct iovec iov[3]; if(!ch) return -EINVAL; f = (struct fuse_ll*)fuse_session_data(fuse_chan_session(ch)); if(!f) return -ENODEV; if(f->conn.proto_minor < 18) return -ENOSYS; outarg.parent = parent; outarg.child = child; outarg.namelen = namelen; outarg.padding = 0; iov[1].iov_base = &outarg; iov[1].iov_len = sizeof(outarg); iov[2].iov_base = (void *)name; iov[2].iov_len = namelen + 1; return send_notify_iov(f, ch, FUSE_NOTIFY_DELETE, iov, 3); } int fuse_lowlevel_notify_store(struct fuse_chan *ch, uint64_t ino, off_t offset, struct fuse_bufvec *bufv, enum fuse_buf_copy_flags flags) { struct fuse_out_header out; struct fuse_notify_store_out outarg; struct fuse_ll *f; struct iovec iov[3]; size_t size = fuse_buf_size(bufv); int res; if(!ch) return -EINVAL; f = (struct fuse_ll*)fuse_session_data(fuse_chan_session(ch)); if(!f) return -ENODEV; if(f->conn.proto_minor < 15) return -ENOSYS; out.unique = 0; out.error = FUSE_NOTIFY_STORE; outarg.nodeid = ino; outarg.offset = offset; outarg.size = size; outarg.padding = 0; iov[0].iov_base = &out; iov[0].iov_len = sizeof(out); iov[1].iov_base = &outarg; iov[1].iov_len = sizeof(outarg); res = fuse_send_data_iov(f, ch, iov, 2, bufv, flags); if(res > 0) res = -res; return res; } struct fuse_retrieve_req { struct fuse_notify_req nreq; void *cookie; }; static void fuse_ll_retrieve_reply(struct fuse_notify_req *nreq, fuse_req_t req, uint64_t ino, const void *inarg) { struct fuse_retrieve_req *rreq = container_of(nreq, struct fuse_retrieve_req, nreq); fuse_reply_none(req); free(rreq); } int fuse_lowlevel_notify_retrieve(struct fuse_chan *ch, uint64_t ino, size_t size, off_t offset, void *cookie) { struct fuse_notify_retrieve_out outarg; struct fuse_ll *f; struct iovec iov[2]; struct fuse_retrieve_req *rreq; int err; if(!ch) return -EINVAL; f = (struct fuse_ll*)fuse_session_data(fuse_chan_session(ch)); if(!f) return -ENODEV; if(f->conn.proto_minor < 15) return -ENOSYS; rreq = malloc(sizeof(*rreq)); if(rreq == NULL) return -ENOMEM; pthread_mutex_lock(&f->lock); rreq->cookie = cookie; rreq->nreq.unique = f->notify_ctr++; rreq->nreq.reply = fuse_ll_retrieve_reply; list_add_nreq(&rreq->nreq, &f->notify_list); pthread_mutex_unlock(&f->lock); outarg.notify_unique = rreq->nreq.unique; outarg.nodeid = ino; outarg.offset = offset; outarg.size = size; iov[1].iov_base = &outarg; iov[1].iov_len = sizeof(outarg); err = send_notify_iov(f, ch, FUSE_NOTIFY_RETRIEVE, iov, 2); if(err) { pthread_mutex_lock(&f->lock); list_del_nreq(&rreq->nreq); pthread_mutex_unlock(&f->lock); free(rreq); } return err; } void * fuse_req_userdata(fuse_req_t req) { return req->f->userdata; } const struct fuse_ctx * fuse_req_ctx(fuse_req_t req) { return &req->ctx; } static struct { void (*func)(fuse_req_t, struct fuse_in_header *); const char *name; } fuse_ll_ops[] = { [FUSE_LOOKUP] = { do_lookup, "LOOKUP" }, [FUSE_FORGET] = { do_forget, "FORGET" }, [FUSE_GETATTR] = { do_getattr, "GETATTR" }, [FUSE_SETATTR] = { do_setattr, "SETATTR" }, [FUSE_READLINK] = { do_readlink, "READLINK" }, [FUSE_SYMLINK] = { do_symlink, "SYMLINK" }, [FUSE_MKNOD] = { do_mknod, "MKNOD" }, [FUSE_MKDIR] = { do_mkdir, "MKDIR" }, [FUSE_UNLINK] = { do_unlink, "UNLINK" }, [FUSE_RMDIR] = { do_rmdir, "RMDIR" }, [FUSE_RENAME] = { do_rename, "RENAME" }, [FUSE_LINK] = { do_link, "LINK" }, [FUSE_OPEN] = { do_open, "OPEN" }, [FUSE_READ] = { do_read, "READ" }, [FUSE_WRITE] = { do_write, "WRITE" }, [FUSE_STATFS] = { do_statfs, "STATFS" }, [FUSE_RELEASE] = { do_release, "RELEASE" }, [FUSE_FSYNC] = { do_fsync, "FSYNC" }, [FUSE_SETXATTR] = { do_setxattr, "SETXATTR" }, [FUSE_GETXATTR] = { do_getxattr, "GETXATTR" }, [FUSE_LISTXATTR] = { do_listxattr, "LISTXATTR" }, [FUSE_REMOVEXATTR] = { do_removexattr, "REMOVEXATTR" }, [FUSE_FLUSH] = { do_flush, "FLUSH" }, [FUSE_INIT] = { do_init, "INIT" }, [FUSE_OPENDIR] = { do_opendir, "OPENDIR" }, [FUSE_READDIR] = { do_readdir, "READDIR" }, [FUSE_READDIRPLUS] = { do_readdir_plus, "READDIR_PLUS" }, [FUSE_RELEASEDIR] = { do_releasedir, "RELEASEDIR" }, [FUSE_FSYNCDIR] = { do_fsyncdir, "FSYNCDIR" }, [FUSE_GETLK] = { do_getlk, "GETLK" }, [FUSE_SETLK] = { do_setlk, "SETLK" }, [FUSE_SETLKW] = { do_setlkw, "SETLKW" }, [FUSE_ACCESS] = { do_access, "ACCESS" }, [FUSE_CREATE] = { do_create, "CREATE" }, [FUSE_INTERRUPT] = { do_interrupt, "INTERRUPT" }, [FUSE_BMAP] = { do_bmap, "BMAP" }, [FUSE_IOCTL] = { do_ioctl, "IOCTL" }, [FUSE_POLL] = { do_poll, "POLL" }, [FUSE_FALLOCATE] = { do_fallocate, "FALLOCATE" }, [FUSE_DESTROY] = { do_destroy, "DESTROY" }, [FUSE_NOTIFY_REPLY] = { do_notify_reply, "NOTIFY_REPLY" }, [FUSE_BATCH_FORGET] = { do_batch_forget, "BATCH_FORGET" }, [FUSE_COPY_FILE_RANGE] = { do_copy_file_range, "COPY_FILE_RANGE" }, [FUSE_SETUPMAPPING] = { do_setupmapping, "SETUPMAPPING" }, [FUSE_REMOVEMAPPING] = { do_removemapping, "REMOVEMAPPING" }, [FUSE_SYNCFS] = { do_syncfs, "SYNCFS" }, [FUSE_TMPFILE] = { do_tmpfile, "TMPFILE" } }; #define FUSE_MAXOP (sizeof(fuse_ll_ops) / sizeof(fuse_ll_ops[0])) enum { KEY_HELP, KEY_VERSION, }; static const struct fuse_opt fuse_ll_opts[] = { { "debug", offsetof(struct fuse_ll, debug), 1 }, { "-d", offsetof(struct fuse_ll, debug), 1 }, { "max_readahead=%u", offsetof(struct fuse_ll, conn.max_readahead), 0 }, { "max_background=%u", offsetof(struct fuse_ll, conn.max_background), 0 }, { "congestion_threshold=%u", offsetof(struct fuse_ll, conn.congestion_threshold), 0 }, { "no_remote_lock", offsetof(struct fuse_ll, no_remote_posix_lock), 1}, { "no_remote_lock", offsetof(struct fuse_ll, no_remote_flock), 1}, { "no_remote_flock", offsetof(struct fuse_ll, no_remote_flock), 1}, { "no_remote_posix_lock", offsetof(struct fuse_ll, no_remote_posix_lock), 1}, FUSE_OPT_KEY("max_read=", FUSE_OPT_KEY_DISCARD), FUSE_OPT_KEY("-h", KEY_HELP), FUSE_OPT_KEY("--help", KEY_HELP), FUSE_OPT_KEY("-V", KEY_VERSION), FUSE_OPT_KEY("--version", KEY_VERSION), FUSE_OPT_END }; static void fuse_ll_version(void) { fprintf(stderr, "using FUSE kernel interface version %i.%i\n", FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION); } static void fuse_ll_help(void) { fprintf(stderr, " -o max_readahead=N set maximum readahead\n" " -o max_background=N set number of maximum background requests\n" " -o congestion_threshold=N set kernel's congestion threshold\n" " -o no_remote_lock disable remote file locking\n" " -o no_remote_flock disable remote file locking (BSD)\n" " -o no_remote_posix_lock disable remove file locking (POSIX)\n" ); } static int fuse_ll_opt_proc(void *data, const char *arg, int key, struct fuse_args *outargs) { (void) data; (void) outargs; switch (key) { case KEY_HELP: fuse_ll_help(); break; case KEY_VERSION: fuse_ll_version(); break; default: fprintf(stderr, "fuse: unknown option `%s'\n", arg); } return -1; } int fuse_lowlevel_is_lib_option(const char *opt) { return fuse_opt_match(fuse_ll_opts, opt); } static void fuse_ll_destroy(void *data) { struct fuse_ll *f = (struct fuse_ll *)data; struct fuse_ll_pipe *llp; if(f->got_init && !f->got_destroy) { if(f->op.destroy) f->op.destroy(f->userdata); } llp = pthread_getspecific(f->pipe_key); if(llp != NULL) fuse_ll_pipe_free(llp); pthread_key_delete(f->pipe_key); pthread_mutex_destroy(&f->lock); free(f); lfmp_clear(&g_FMP_fuse_req); } static void fuse_ll_pipe_destructor(void *data) { struct fuse_ll_pipe *llp = data; fuse_ll_pipe_free(llp); } static void fuse_send_errno(struct fuse_ll *f_, struct fuse_chan *ch_, const int errno_, const uint64_t unique_id_) { struct fuse_out_header out = {0}; struct iovec iov = {0}; out.unique = unique_id_; out.error = -errno_; iov.iov_base = &out; iov.iov_len = sizeof(struct fuse_out_header); fuse_send_msg(f_,ch_,&iov,1); } static void fuse_send_enomem(struct fuse_ll *f_, struct fuse_chan *ch_, const uint64_t unique_id_) { fuse_send_errno(f_,ch_,ENOMEM,unique_id_); } static int fuse_ll_buf_receive_read(struct fuse_session *se_, fuse_msgbuf_t *msgbuf_) { int rv; rv = read(fuse_chan_fd(se_->ch),msgbuf_->mem,msgbuf_->size); if(rv == -1) return -errno; if(rv < sizeof(struct fuse_in_header)) { fprintf(stderr, "short read from fuse device\n"); return -EIO; } return rv; } static void fuse_ll_buf_process_read(struct fuse_session *se_, const fuse_msgbuf_t *msgbuf_) { int err; struct fuse_req *req; struct fuse_in_header *in; in = (struct fuse_in_header*)msgbuf_->mem; // printf("%d\n",in->opcode); req = fuse_ll_alloc_req(se_->f); if(req == NULL) return fuse_send_enomem(se_->f,se_->ch,in->unique); req->unique = in->unique; req->ctx.uid = in->uid; req->ctx.gid = in->gid; req->ctx.pid = in->pid; req->ch = se_->ch; err = ENOSYS; if(in->opcode >= FUSE_MAXOP) goto reply_err; if(fuse_ll_ops[in->opcode].func == NULL) goto reply_err; fuse_ll_ops[in->opcode].func(req, in); return; reply_err: fuse_reply_err(req, err); return; } static void fuse_ll_buf_process_read_init(struct fuse_session *se_, const fuse_msgbuf_t *msgbuf_) { int err; struct fuse_req *req; struct fuse_in_header *in; in = (struct fuse_in_header*)msgbuf_->mem; req = fuse_ll_alloc_req(se_->f); if(req == NULL) return fuse_send_enomem(se_->f,se_->ch,in->unique); req->unique = in->unique; req->ctx.uid = in->uid; req->ctx.gid = in->gid; req->ctx.pid = in->pid; req->ch = se_->ch; err = EIO; if(in->opcode != FUSE_INIT) goto reply_err; if(fuse_ll_ops[in->opcode].func == NULL) goto reply_err; se_->process_buf = fuse_ll_buf_process_read; fuse_ll_ops[in->opcode].func(req, in); return; reply_err: fuse_reply_err(req, err); return; } /* * always call fuse_lowlevel_new_common() internally, to work around a * misfeature in the FreeBSD runtime linker, which links the old * version of a symbol to internal references. */ struct fuse_session * fuse_lowlevel_new_common(struct fuse_args *args, const struct fuse_lowlevel_ops *op, size_t op_size, void *userdata) { int err; struct fuse_ll *f; struct fuse_session *se; if(sizeof(struct fuse_lowlevel_ops) < op_size) { fprintf(stderr, "fuse: warning: library too old, some operations may not work\n"); op_size = sizeof(struct fuse_lowlevel_ops); } f = (struct fuse_ll *) calloc(1, sizeof(struct fuse_ll)); if(f == NULL) { fprintf(stderr, "fuse: failed to allocate fuse object\n"); goto out; } f->conn.max_write = UINT_MAX; f->conn.max_readahead = UINT_MAX; list_init_nreq(&f->notify_list); f->notify_ctr = 1; fuse_mutex_init(&f->lock); err = pthread_key_create(&f->pipe_key, fuse_ll_pipe_destructor); if(err) { fprintf(stderr, "fuse: failed to create thread specific key: %s\n", strerror(err)); goto out_free; } if(fuse_opt_parse(args, f, fuse_ll_opts, fuse_ll_opt_proc) == -1) goto out_key_destroy; memcpy(&f->op, op, op_size); f->owner = getuid(); f->userdata = userdata; se = fuse_session_new(f, fuse_ll_buf_receive_read, fuse_ll_buf_process_read_init, fuse_ll_destroy); if(!se) goto out_key_destroy; return se; out_key_destroy: pthread_key_delete(f->pipe_key); out_free: pthread_mutex_destroy(&f->lock); free(f); out: return NULL; } struct fuse_session* fuse_lowlevel_new(struct fuse_args *args, const struct fuse_lowlevel_ops *op, size_t op_size, void *userdata) { return fuse_lowlevel_new_common(args, op, op_size, userdata); }