| /* |
| FUSE: Filesystem in Userspace |
| Copyright (C) 2001-2007 Miklos Szeredi <miklos@szeredi.hu> |
| |
| Implementation of (most of) the low-level FUSE API. The session loop |
| functions are implemented in separate files. |
| |
| This program can be distributed under the terms of the GNU LGPLv2. |
| See the file COPYING.LIB |
| */ |
| |
| #define _GNU_SOURCE |
| |
| #include "config.h" |
| #include "fuse_i.h" |
| #include "fuse_kernel.h" |
| #include "fuse_opt.h" |
| #include "fuse_misc.h" |
| |
| #include <stdio.h> |
| #include <stdlib.h> |
| #include <stddef.h> |
| #include <string.h> |
| #include <unistd.h> |
| #include <limits.h> |
| #include <errno.h> |
| #include <assert.h> |
| #include <sys/file.h> |
| |
| #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) );}) |
| |
| struct fuse_pollhandle { |
| uint64_t kh; |
| struct fuse_session *se; |
| }; |
| |
| static size_t pagesize; |
| |
| static __attribute__((constructor)) void fuse_ll_init_pagesize(void) |
| { |
| pagesize = getpagesize(); |
| } |
| |
| 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 void convert_attr(const struct fuse_setattr_in *attr, struct stat *stbuf) |
| { |
| stbuf->st_mode = attr->mode; |
| stbuf->st_uid = attr->uid; |
| stbuf->st_gid = attr->gid; |
| stbuf->st_size = attr->size; |
| stbuf->st_atime = attr->atime; |
| stbuf->st_mtime = attr->mtime; |
| stbuf->st_ctime = attr->ctime; |
| ST_ATIM_NSEC_SET(stbuf, attr->atimensec); |
| ST_MTIM_NSEC_SET(stbuf, attr->mtimensec); |
| ST_CTIM_NSEC_SET(stbuf, attr->ctimensec); |
| } |
| |
| 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 list_init_req(struct fuse_req *req) |
| { |
| req->next = req; |
| req->prev = req; |
| } |
| |
| static void list_del_req(struct fuse_req *req) |
| { |
| struct fuse_req *prev = req->prev; |
| struct fuse_req *next = req->next; |
| prev->next = next; |
| next->prev = prev; |
| } |
| |
| static void list_add_req(struct fuse_req *req, struct fuse_req *next) |
| { |
| struct fuse_req *prev = next->prev; |
| req->next = next; |
| req->prev = prev; |
| prev->next = req; |
| next->prev = req; |
| } |
| |
| static void destroy_req(fuse_req_t req) |
| { |
| pthread_mutex_destroy(&req->lock); |
| free(req); |
| } |
| |
| void fuse_free_req(fuse_req_t req) |
| { |
| int ctr; |
| struct fuse_session *se = req->se; |
| |
| pthread_mutex_lock(&se->lock); |
| req->u.ni.func = NULL; |
| req->u.ni.data = NULL; |
| list_del_req(req); |
| ctr = --req->ctr; |
| fuse_chan_put(req->ch); |
| req->ch = NULL; |
| pthread_mutex_unlock(&se->lock); |
| if (!ctr) |
| destroy_req(req); |
| } |
| |
| static struct fuse_req *fuse_ll_alloc_req(struct fuse_session *se) |
| { |
| struct fuse_req *req; |
| |
| req = (struct fuse_req *) calloc(1, sizeof(struct fuse_req)); |
| if (req == NULL) { |
| fprintf(stderr, "fuse: failed to allocate request\n"); |
| } else { |
| req->se = se; |
| req->ctr = 1; |
| list_init_req(req); |
| fuse_mutex_init(&req->lock); |
| } |
| |
| return req; |
| } |
| |
| /* Send data. If *ch* is NULL, send via session master fd */ |
| static int fuse_send_msg(struct fuse_session *se, struct fuse_chan *ch, |
| struct iovec *iov, int count) |
| { |
| struct fuse_out_header *out = iov[0].iov_base; |
| |
| out->len = iov_length(iov, count); |
| if (se->debug) { |
| if (out->unique == 0) { |
| fprintf(stderr, "NOTIFY: code=%d length=%u\n", |
| out->error, out->len); |
| } else if (out->error) { |
| fprintf(stderr, |
| " unique: %llu, error: %i (%s), outsize: %i\n", |
| (unsigned long long) out->unique, out->error, |
| strerror(-out->error), out->len); |
| } else { |
| fprintf(stderr, |
| " unique: %llu, success, outsize: %i\n", |
| (unsigned long long) out->unique, out->len); |
| } |
| } |
| |
| ssize_t res = writev(ch ? ch->fd : se->fd, |
| iov, count); |
| int err = errno; |
| |
| if (res == -1) { |
| assert(se != NULL); |
| |
| /* ENOENT means the operation was interrupted */ |
| if (!fuse_session_exited(se) && err != ENOENT) |
| perror("fuse: writing device"); |
| return -err; |
| } |
| |
| return 0; |
| } |
| |
| |
| int fuse_send_reply_iov_nofree(fuse_req_t req, int error, struct iovec *iov, |
| int count) |
| { |
| struct fuse_out_header out; |
| |
| if (error <= -1000 || error > 0) { |
| 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->se, 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); |
| fuse_free_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); |
| } |
| |
| int fuse_reply_iov(fuse_req_t req, const struct iovec *iov, int count) |
| { |
| int res; |
| struct iovec *padded_iov; |
| |
| padded_iov = malloc((count + 1) * sizeof(struct iovec)); |
| if (padded_iov == NULL) |
| return fuse_reply_err(req, ENOMEM); |
| |
| memcpy(padded_iov + 1, iov, count * sizeof(struct iovec)); |
| count++; |
| |
| res = send_reply_iov(req, 0, padded_iov, count); |
| free(padded_iov); |
| |
| return res; |
| } |
| |
| |
| /* `buf` is allowed to be empty so that the proper size may be |
| allocated by the caller */ |
| size_t fuse_add_direntry(fuse_req_t req, char *buf, size_t bufsize, |
| const char *name, const struct stat *stbuf, off_t off) |
| { |
| (void)req; |
| size_t namelen; |
| size_t entlen; |
| size_t entlen_padded; |
| struct fuse_dirent *dirent; |
| |
| namelen = strlen(name); |
| entlen = FUSE_NAME_OFFSET + namelen; |
| entlen_padded = FUSE_DIRENT_ALIGN(entlen); |
| |
| if ((buf == NULL) || (entlen_padded > bufsize)) |
| return entlen_padded; |
| |
| dirent = (struct fuse_dirent*) buf; |
| dirent->ino = stbuf->st_ino; |
| dirent->off = off; |
| dirent->namelen = namelen; |
| dirent->type = (stbuf->st_mode & 0170000) >> 12; |
| strncpy(dirent->name, name, namelen); |
| memset(dirent->name + namelen, 0, entlen_padded - entlen); |
| |
| return entlen_padded; |
| } |
| |
| 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) |
| { |
| fuse_free_req(req); |
| } |
| |
| static unsigned long calc_timeout_sec(double t) |
| { |
| if (t > (double) ULONG_MAX) |
| return ULONG_MAX; |
| else if (t < 0.0) |
| return 0; |
| else |
| return (unsigned long) t; |
| } |
| |
| static unsigned int calc_timeout_nsec(double t) |
| { |
| double f = t - (double) calc_timeout_sec(t); |
| if (f < 0.0) |
| return 0; |
| else if (f >= 0.999999999) |
| return 999999999; |
| else |
| return (unsigned int) (f * 1.0e9); |
| } |
| |
| 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 = calc_timeout_sec(e->entry_timeout); |
| arg->entry_valid_nsec = calc_timeout_nsec(e->entry_timeout); |
| arg->attr_valid = calc_timeout_sec(e->attr_timeout); |
| arg->attr_valid_nsec = calc_timeout_nsec(e->attr_timeout); |
| convert_stat(&e->attr, &arg->attr); |
| } |
| |
| /* `buf` is allowed to be empty so that the proper size may be |
| allocated by the caller */ |
| size_t fuse_add_direntry_plus(fuse_req_t req, char *buf, size_t bufsize, |
| const char *name, |
| const struct fuse_entry_param *e, off_t off) |
| { |
| (void)req; |
| size_t namelen; |
| size_t entlen; |
| size_t entlen_padded; |
| |
| namelen = strlen(name); |
| entlen = FUSE_NAME_OFFSET_DIRENTPLUS + namelen; |
| entlen_padded = FUSE_DIRENT_ALIGN(entlen); |
| if ((buf == NULL) || (entlen_padded > bufsize)) |
| return entlen_padded; |
| |
| struct fuse_direntplus *dp = (struct fuse_direntplus *) buf; |
| memset(&dp->entry_out, 0, sizeof(dp->entry_out)); |
| fill_entry(&dp->entry_out, e); |
| |
| struct fuse_dirent *dirent = &dp->dirent; |
| dirent->ino = e->attr.st_ino; |
| dirent->off = off; |
| dirent->namelen = namelen; |
| dirent->type = (e->attr.st_mode & 0170000) >> 12; |
| strncpy(dirent->name, name, namelen); |
| memset(dirent->name + namelen, 0, entlen_padded - entlen); |
| |
| return entlen_padded; |
| } |
| |
| static void fill_open(struct fuse_open_out *arg, |
| const struct fuse_file_info *f) |
| { |
| arg->fh = f->fh; |
| if (f->direct_io) |
| arg->open_flags |= FOPEN_DIRECT_IO; |
| if (f->keep_cache) |
| arg->open_flags |= FOPEN_KEEP_CACHE; |
| if (f->nonseekable) |
| arg->open_flags |= FOPEN_NONSEEKABLE; |
| } |
| |
| int fuse_reply_entry(fuse_req_t req, const struct fuse_entry_param *e) |
| { |
| struct fuse_entry_out arg; |
| size_t size = req->se->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->se->conn.proto_minor < 4) |
| return fuse_reply_err(req, ENOENT); |
| |
| memset(&arg, 0, sizeof(arg)); |
| fill_entry(&arg, e); |
| return send_reply_ok(req, &arg, size); |
| } |
| |
| int fuse_reply_create(fuse_req_t req, const struct fuse_entry_param *e, |
| const struct fuse_file_info *f) |
| { |
| char buf[sizeof(struct fuse_entry_out) + sizeof(struct fuse_open_out)]; |
| size_t entrysize = req->se->conn.proto_minor < 9 ? |
| FUSE_COMPAT_ENTRY_OUT_SIZE : sizeof(struct fuse_entry_out); |
| struct fuse_entry_out *earg = (struct fuse_entry_out *) buf; |
| struct fuse_open_out *oarg = (struct fuse_open_out *) (buf + entrysize); |
| |
| memset(buf, 0, sizeof(buf)); |
| 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, |
| double attr_timeout) |
| { |
| struct fuse_attr_out arg; |
| size_t size = req->se->conn.proto_minor < 9 ? |
| FUSE_COMPAT_ATTR_OUT_SIZE : sizeof(arg); |
| |
| memset(&arg, 0, sizeof(arg)); |
| arg.attr_valid = calc_timeout_sec(attr_timeout); |
| arg.attr_valid_nsec = calc_timeout_nsec(attr_timeout); |
| 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 struct fuse_file_info *f) |
| { |
| struct fuse_open_out arg; |
| |
| memset(&arg, 0, sizeof(arg)); |
| 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; |
| |
| memset(&arg, 0, sizeof(arg)); |
| 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_session *se, |
| struct fuse_chan *ch, |
| struct iovec *iov, int iov_count, |
| struct fuse_bufvec *buf, |
| size_t len) |
| { |
| struct fuse_bufvec mem_buf = FUSE_BUFVEC_INIT(len); |
| void *mbuf; |
| int res; |
| |
| /* 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(se, ch, iov, iov_count); |
| } |
| |
| res = posix_memalign(&mbuf, pagesize, len); |
| if (res != 0) |
| return res; |
| |
| mem_buf.buf[0].mem = mbuf; |
| res = fuse_buf_copy(&mem_buf, buf, 0); |
| if (res < 0) { |
| free(mbuf); |
| return -res; |
| } |
| len = res; |
| |
| iov[iov_count].iov_base = mbuf; |
| iov[iov_count].iov_len = len; |
| iov_count++; |
| res = fuse_send_msg(se, ch, iov, iov_count); |
| free(mbuf); |
| |
| 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); |
| } |
| |
| #ifdef HAVE_SPLICE |
| #if !defined(HAVE_PIPE2) || !defined(O_CLOEXEC) |
| static int fuse_pipe(int fds[2]) |
| { |
| int rv = pipe(fds); |
| |
| if (rv == -1) |
| return rv; |
| |
| if (fcntl(fds[0], F_SETFL, O_NONBLOCK) == -1 || |
| fcntl(fds[1], F_SETFL, O_NONBLOCK) == -1 || |
| fcntl(fds[0], F_SETFD, FD_CLOEXEC) == -1 || |
| fcntl(fds[1], F_SETFD, FD_CLOEXEC) == -1) { |
| close(fds[0]); |
| close(fds[1]); |
| rv = -1; |
| } |
| return rv; |
| } |
| #else |
| static int fuse_pipe(int fds[2]) |
| { |
| return pipe2(fds, O_CLOEXEC | O_NONBLOCK); |
| } |
| #endif |
| |
| static struct fuse_ll_pipe *fuse_ll_get_pipe(struct fuse_session *se) |
| { |
| struct fuse_ll_pipe *llp = pthread_getspecific(se->pipe_key); |
| if (llp == NULL) { |
| int res; |
| |
| llp = malloc(sizeof(struct fuse_ll_pipe)); |
| if (llp == NULL) |
| return NULL; |
| |
| res = fuse_pipe(llp->pipe); |
| if (res == -1) { |
| free(llp); |
| return NULL; |
| } |
| |
| /* |
| *the default size is 16 pages on linux |
| */ |
| llp->size = pagesize * 16; |
| llp->can_grow = 1; |
| |
| pthread_setspecific(se->pipe_key, llp); |
| } |
| |
| return llp; |
| } |
| #endif |
| |
| static void fuse_ll_clear_pipe(struct fuse_session *se) |
| { |
| struct fuse_ll_pipe *llp = pthread_getspecific(se->pipe_key); |
| if (llp) { |
| pthread_setspecific(se->pipe_key, NULL); |
| fuse_ll_pipe_free(llp); |
| } |
| } |
| |
| #if defined(HAVE_SPLICE) && defined(HAVE_VMSPLICE) |
| static int read_back(int fd, char *buf, size_t len) |
| { |
| int res; |
| |
| res = read(fd, buf, len); |
| if (res == -1) { |
| fprintf(stderr, "fuse: internal error: failed to read back from pipe: %s\n", strerror(errno)); |
| return -EIO; |
| } |
| if (res != len) { |
| fprintf(stderr, "fuse: internal error: short read back from pipe: %i from %zi\n", res, len); |
| return -EIO; |
| } |
| return 0; |
| } |
| |
| static int fuse_send_data_iov(struct fuse_session *se, struct fuse_chan *ch, |
| struct iovec *iov, int iov_count, |
| struct fuse_bufvec *buf, unsigned int flags) |
| { |
| int res; |
| size_t len = fuse_buf_size(buf); |
| struct fuse_out_header *out = iov[0].iov_base; |
| struct fuse_ll_pipe *llp; |
| int splice_flags; |
| size_t pipesize; |
| size_t total_fd_size; |
| size_t idx; |
| size_t headerlen; |
| struct fuse_bufvec pipe_buf = FUSE_BUFVEC_INIT(len); |
| |
| if (se->broken_splice_nonblock) |
| goto fallback; |
| |
| if (flags & FUSE_BUF_NO_SPLICE) |
| goto fallback; |
| |
| total_fd_size = 0; |
| for (idx = buf->idx; idx < buf->count; idx++) { |
| if (buf->buf[idx].flags & FUSE_BUF_IS_FD) { |
| total_fd_size = buf->buf[idx].size; |
| if (idx == buf->idx) |
| total_fd_size -= buf->off; |
| } |
| } |
| if (total_fd_size < 2 * pagesize) |
| goto fallback; |
| |
| if (se->conn.proto_minor < 14 || |
| !(se->conn.want & FUSE_CAP_SPLICE_WRITE)) |
| goto fallback; |
| |
| llp = fuse_ll_get_pipe(se); |
| if (llp == NULL) |
| goto fallback; |
| |
| |
| headerlen = iov_length(iov, iov_count); |
| |
| out->len = headerlen + len; |
| |
| /* |
| * Heuristic for the required pipe size, does not work if the |
| * source contains less than page size fragments |
| */ |
| pipesize = pagesize * (iov_count + buf->count + 1) + out->len; |
| |
| if (llp->size < pipesize) { |
| if (llp->can_grow) { |
| res = fcntl(llp->pipe[0], F_SETPIPE_SZ, pipesize); |
| if (res == -1) { |
| llp->can_grow = 0; |
| goto fallback; |
| } |
| llp->size = res; |
| } |
| if (llp->size < pipesize) |
| goto fallback; |
| } |
| |
| |
| res = vmsplice(llp->pipe[1], iov, iov_count, SPLICE_F_NONBLOCK); |
| if (res == -1) |
| goto fallback; |
| |
| if (res != headerlen) { |
| res = -EIO; |
| fprintf(stderr, "fuse: short vmsplice to pipe: %u/%zu\n", res, |
| headerlen); |
| goto clear_pipe; |
| } |
| |
| pipe_buf.buf[0].flags = FUSE_BUF_IS_FD; |
| pipe_buf.buf[0].fd = llp->pipe[1]; |
| |
| res = fuse_buf_copy(&pipe_buf, buf, |
| FUSE_BUF_FORCE_SPLICE | FUSE_BUF_SPLICE_NONBLOCK); |
| if (res < 0) { |
| if (res == -EAGAIN || res == -EINVAL) { |
| /* |
| * Should only get EAGAIN on kernels with |
| * broken SPLICE_F_NONBLOCK support (<= |
| * 2.6.35) where this error or a short read is |
| * returned even if the pipe itself is not |
| * full |
| * |
| * EINVAL might mean that splice can't handle |
| * this combination of input and output. |
| */ |
| if (res == -EAGAIN) |
| se->broken_splice_nonblock = 1; |
| |
| pthread_setspecific(se->pipe_key, NULL); |
| fuse_ll_pipe_free(llp); |
| goto fallback; |
| } |
| res = -res; |
| goto clear_pipe; |
| } |
| |
| if (res != 0 && res < len) { |
| struct fuse_bufvec mem_buf = FUSE_BUFVEC_INIT(len); |
| void *mbuf; |
| size_t now_len = res; |
| /* |
| * For regular files a short count is either |
| * 1) due to EOF, or |
| * 2) because of broken SPLICE_F_NONBLOCK (see above) |
| * |
| * For other inputs it's possible that we overflowed |
| * the pipe because of small buffer fragments. |
| */ |
| |
| res = posix_memalign(&mbuf, pagesize, len); |
| if (res != 0) |
| goto clear_pipe; |
| |
| mem_buf.buf[0].mem = mbuf; |
| mem_buf.off = now_len; |
| res = fuse_buf_copy(&mem_buf, buf, 0); |
| if (res > 0) { |
| char *tmpbuf; |
| size_t extra_len = res; |
| /* |
| * Trickiest case: got more data. Need to get |
| * back the data from the pipe and then fall |
| * back to regular write. |
| */ |
| tmpbuf = malloc(headerlen); |
| if (tmpbuf == NULL) { |
| free(mbuf); |
| res = ENOMEM; |
| goto clear_pipe; |
| } |
| res = read_back(llp->pipe[0], tmpbuf, headerlen); |
| free(tmpbuf); |
| if (res != 0) { |
| free(mbuf); |
| goto clear_pipe; |
| } |
| res = read_back(llp->pipe[0], mbuf, now_len); |
| if (res != 0) { |
| free(mbuf); |
| goto clear_pipe; |
| } |
| len = now_len + extra_len; |
| iov[iov_count].iov_base = mbuf; |
| iov[iov_count].iov_len = len; |
| iov_count++; |
| res = fuse_send_msg(se, ch, iov, iov_count); |
| free(mbuf); |
| return res; |
| } |
| free(mbuf); |
| res = now_len; |
| } |
| len = res; |
| out->len = headerlen + len; |
| |
| if (se->debug) { |
| fprintf(stderr, |
| " unique: %llu, success, outsize: %i (splice)\n", |
| (unsigned long long) out->unique, out->len); |
| } |
| |
| splice_flags = 0; |
| if ((flags & FUSE_BUF_SPLICE_MOVE) && |
| (se->conn.want & FUSE_CAP_SPLICE_MOVE)) |
| splice_flags |= SPLICE_F_MOVE; |
| |
| res = splice(llp->pipe[0], NULL, ch ? ch->fd : se->fd, |
| NULL, out->len, splice_flags); |
| if (res == -1) { |
| res = -errno; |
| perror("fuse: splice from pipe"); |
| goto clear_pipe; |
| } |
| if (res != out->len) { |
| res = -EIO; |
| fprintf(stderr, "fuse: short splice from pipe: %u/%u\n", |
| res, out->len); |
| goto clear_pipe; |
| } |
| return 0; |
| |
| clear_pipe: |
| fuse_ll_clear_pipe(se); |
| return res; |
| |
| fallback: |
| return fuse_send_data_iov_fallback(se, ch, iov, iov_count, buf, len); |
| } |
| #else |
| static int fuse_send_data_iov(struct fuse_session *se, 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(se, ch, iov, iov_count, buf, len); |
| } |
| #endif |
| |
| int fuse_reply_data(fuse_req_t req, struct fuse_bufvec *bufv, |
| enum fuse_buf_copy_flags flags) |
| { |
| struct iovec iov[2]; |
| struct fuse_out_header out; |
| int res; |
| |
| iov[0].iov_base = &out; |
| iov[0].iov_len = sizeof(struct fuse_out_header); |
| |
| out.unique = req->unique; |
| out.error = 0; |
| |
| res = fuse_send_data_iov(req->se, req->ch, iov, 1, bufv, flags); |
| if (res <= 0) { |
| fuse_free_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; |
| size_t size = req->se->conn.proto_minor < 4 ? |
| FUSE_COMPAT_STATFS_SIZE : sizeof(arg); |
| |
| memset(&arg, 0, 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; |
| |
| memset(&arg, 0, sizeof(arg)); |
| 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; |
| |
| memset(&arg, 0, sizeof(arg)); |
| 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; |
| |
| memset(&arg, 0, sizeof(arg)); |
| 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; |
| struct fuse_ioctl_iovec *in_fiov = NULL; |
| struct fuse_ioctl_iovec *out_fiov = NULL; |
| struct iovec iov[4]; |
| size_t count = 1; |
| int res; |
| |
| memset(&arg, 0, sizeof(arg)); |
| 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->se->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, size_t size) |
| { |
| struct fuse_ioctl_out arg; |
| struct iovec iov[3]; |
| size_t count = 1; |
| |
| memset(&arg, 0, sizeof(arg)); |
| arg.result = result; |
| 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; |
| int res; |
| |
| padded_iov = malloc((count + 2) * sizeof(struct iovec)); |
| if (padded_iov == NULL) |
| return fuse_reply_err(req, ENOMEM); |
| |
| memset(&arg, 0, sizeof(arg)); |
| 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; |
| |
| memset(&arg, 0, sizeof(arg)); |
| arg.revents = revents; |
| |
| return send_reply_ok(req, &arg, sizeof(arg)); |
| } |
| |
| static void do_lookup(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) |
| { |
| char *name = (char *) inarg; |
| |
| if (req->se->op.lookup) |
| req->se->op.lookup(req, nodeid, name); |
| else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_forget(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) |
| { |
| struct fuse_forget_in *arg = (struct fuse_forget_in *) inarg; |
| |
| if (req->se->op.forget) |
| req->se->op.forget(req, nodeid, arg->nlookup); |
| else |
| fuse_reply_none(req); |
| } |
| |
| static void do_batch_forget(fuse_req_t req, fuse_ino_t nodeid, |
| const void *inarg) |
| { |
| struct fuse_batch_forget_in *arg = (void *) inarg; |
| struct fuse_forget_one *param = (void *) PARAM(arg); |
| unsigned int i; |
| |
| (void) nodeid; |
| |
| if (req->se->op.forget_multi) { |
| req->se->op.forget_multi(req, arg->count, |
| (struct fuse_forget_data *) param); |
| } else if (req->se->op.forget) { |
| for (i = 0; i < arg->count; i++) { |
| struct fuse_forget_one *forget = ¶m[i]; |
| struct fuse_req *dummy_req; |
| |
| dummy_req = fuse_ll_alloc_req(req->se); |
| if (dummy_req == NULL) |
| break; |
| |
| dummy_req->unique = req->unique; |
| dummy_req->ctx = req->ctx; |
| dummy_req->ch = NULL; |
| |
| req->se->op.forget(dummy_req, forget->nodeid, |
| forget->nlookup); |
| } |
| fuse_reply_none(req); |
| } else { |
| fuse_reply_none(req); |
| } |
| } |
| |
| static void do_getattr(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) |
| { |
| struct fuse_file_info *fip = NULL; |
| struct fuse_file_info fi; |
| |
| if (req->se->conn.proto_minor >= 9) { |
| struct fuse_getattr_in *arg = (struct fuse_getattr_in *) inarg; |
| |
| if (arg->getattr_flags & FUSE_GETATTR_FH) { |
| memset(&fi, 0, sizeof(fi)); |
| fi.fh = arg->fh; |
| fip = &fi; |
| } |
| } |
| |
| if (req->se->op.getattr) |
| req->se->op.getattr(req, nodeid, fip); |
| else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_setattr(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) |
| { |
| struct fuse_setattr_in *arg = (struct fuse_setattr_in *) inarg; |
| |
| if (req->se->op.setattr) { |
| struct fuse_file_info *fi = NULL; |
| struct fuse_file_info fi_store; |
| struct stat stbuf; |
| memset(&stbuf, 0, sizeof(stbuf)); |
| convert_attr(arg, &stbuf); |
| if (arg->valid & FATTR_FH) { |
| arg->valid &= ~FATTR_FH; |
| memset(&fi_store, 0, sizeof(fi_store)); |
| fi = &fi_store; |
| fi->fh = arg->fh; |
| } |
| arg->valid &= |
| FUSE_SET_ATTR_MODE | |
| FUSE_SET_ATTR_UID | |
| FUSE_SET_ATTR_GID | |
| FUSE_SET_ATTR_SIZE | |
| FUSE_SET_ATTR_ATIME | |
| FUSE_SET_ATTR_MTIME | |
| FUSE_SET_ATTR_ATIME_NOW | |
| FUSE_SET_ATTR_MTIME_NOW | |
| FUSE_SET_ATTR_CTIME; |
| |
| req->se->op.setattr(req, nodeid, &stbuf, arg->valid, fi); |
| } else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_access(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) |
| { |
| struct fuse_access_in *arg = (struct fuse_access_in *) inarg; |
| |
| if (req->se->op.access) |
| req->se->op.access(req, nodeid, arg->mask); |
| else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_readlink(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) |
| { |
| (void) inarg; |
| |
| if (req->se->op.readlink) |
| req->se->op.readlink(req, nodeid); |
| else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_mknod(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) |
| { |
| struct fuse_mknod_in *arg = (struct fuse_mknod_in *) inarg; |
| char *name = PARAM(arg); |
| |
| if (req->se->conn.proto_minor >= 12) |
| req->ctx.umask = arg->umask; |
| else |
| name = (char *) inarg + FUSE_COMPAT_MKNOD_IN_SIZE; |
| |
| if (req->se->op.mknod) |
| req->se->op.mknod(req, nodeid, name, arg->mode, arg->rdev); |
| else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_mkdir(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) |
| { |
| struct fuse_mkdir_in *arg = (struct fuse_mkdir_in *) inarg; |
| |
| if (req->se->conn.proto_minor >= 12) |
| req->ctx.umask = arg->umask; |
| |
| if (req->se->op.mkdir) |
| req->se->op.mkdir(req, nodeid, PARAM(arg), arg->mode); |
| else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_unlink(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) |
| { |
| char *name = (char *) inarg; |
| |
| if (req->se->op.unlink) |
| req->se->op.unlink(req, nodeid, name); |
| else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_rmdir(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) |
| { |
| char *name = (char *) inarg; |
| |
| if (req->se->op.rmdir) |
| req->se->op.rmdir(req, nodeid, name); |
| else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_symlink(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) |
| { |
| char *name = (char *) inarg; |
| char *linkname = ((char *) inarg) + strlen((char *) inarg) + 1; |
| |
| if (req->se->op.symlink) |
| req->se->op.symlink(req, linkname, nodeid, name); |
| else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_rename(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) |
| { |
| struct fuse_rename_in *arg = (struct fuse_rename_in *) inarg; |
| char *oldname = PARAM(arg); |
| char *newname = oldname + strlen(oldname) + 1; |
| |
| if (req->se->op.rename) |
| req->se->op.rename(req, nodeid, oldname, arg->newdir, newname, |
| 0); |
| else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_rename2(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) |
| { |
| struct fuse_rename2_in *arg = (struct fuse_rename2_in *) inarg; |
| char *oldname = PARAM(arg); |
| char *newname = oldname + strlen(oldname) + 1; |
| |
| if (req->se->op.rename) |
| req->se->op.rename(req, nodeid, oldname, arg->newdir, newname, |
| arg->flags); |
| else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_link(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) |
| { |
| struct fuse_link_in *arg = (struct fuse_link_in *) inarg; |
| |
| if (req->se->op.link) |
| req->se->op.link(req, arg->oldnodeid, nodeid, PARAM(arg)); |
| else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_create(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) |
| { |
| struct fuse_create_in *arg = (struct fuse_create_in *) inarg; |
| |
| if (req->se->op.create) { |
| struct fuse_file_info fi; |
| char *name = PARAM(arg); |
| |
| memset(&fi, 0, sizeof(fi)); |
| fi.flags = arg->flags; |
| |
| if (req->se->conn.proto_minor >= 12) |
| req->ctx.umask = arg->umask; |
| else |
| name = (char *) inarg + sizeof(struct fuse_open_in); |
| |
| req->se->op.create(req, nodeid, name, arg->mode, &fi); |
| } else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_open(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) |
| { |
| struct fuse_open_in *arg = (struct fuse_open_in *) inarg; |
| struct fuse_file_info fi; |
| |
| memset(&fi, 0, sizeof(fi)); |
| fi.flags = arg->flags; |
| |
| if (req->se->op.open) |
| req->se->op.open(req, nodeid, &fi); |
| else |
| fuse_reply_open(req, &fi); |
| } |
| |
| static void do_read(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) |
| { |
| struct fuse_read_in *arg = (struct fuse_read_in *) inarg; |
| |
| if (req->se->op.read) { |
| struct fuse_file_info fi; |
| |
| memset(&fi, 0, sizeof(fi)); |
| fi.fh = arg->fh; |
| if (req->se->conn.proto_minor >= 9) { |
| fi.lock_owner = arg->lock_owner; |
| fi.flags = arg->flags; |
| } |
| req->se->op.read(req, nodeid, arg->size, arg->offset, &fi); |
| } else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_write(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) |
| { |
| struct fuse_write_in *arg = (struct fuse_write_in *) inarg; |
| struct fuse_file_info fi; |
| char *param; |
| |
| memset(&fi, 0, sizeof(fi)); |
| fi.fh = arg->fh; |
| fi.writepage = (arg->write_flags & 1) != 0; |
| |
| if (req->se->conn.proto_minor < 9) { |
| param = ((char *) arg) + FUSE_COMPAT_WRITE_IN_SIZE; |
| } else { |
| fi.lock_owner = arg->lock_owner; |
| fi.flags = arg->flags; |
| param = PARAM(arg); |
| } |
| |
| if (req->se->op.write) |
| req->se->op.write(req, nodeid, param, arg->size, |
| arg->offset, &fi); |
| else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_write_buf(fuse_req_t req, fuse_ino_t nodeid, const void *inarg, |
| const struct fuse_buf *ibuf) |
| { |
| struct fuse_session *se = req->se; |
| struct fuse_bufvec bufv = { |
| .buf[0] = *ibuf, |
| .count = 1, |
| }; |
| struct fuse_write_in *arg = (struct fuse_write_in *) inarg; |
| struct fuse_file_info fi; |
| |
| memset(&fi, 0, sizeof(fi)); |
| fi.fh = arg->fh; |
| fi.writepage = arg->write_flags & 1; |
| |
| if (se->conn.proto_minor < 9) { |
| bufv.buf[0].mem = ((char *) arg) + FUSE_COMPAT_WRITE_IN_SIZE; |
| bufv.buf[0].size -= sizeof(struct fuse_in_header) + |
| FUSE_COMPAT_WRITE_IN_SIZE; |
| assert(!(bufv.buf[0].flags & FUSE_BUF_IS_FD)); |
| } else { |
| fi.lock_owner = arg->lock_owner; |
| fi.flags = arg->flags; |
| if (!(bufv.buf[0].flags & FUSE_BUF_IS_FD)) |
| bufv.buf[0].mem = PARAM(arg); |
| |
| bufv.buf[0].size -= sizeof(struct fuse_in_header) + |
| sizeof(struct fuse_write_in); |
| } |
| if (bufv.buf[0].size < arg->size) { |
| fprintf(stderr, "fuse: do_write_buf: buffer size too small\n"); |
| fuse_reply_err(req, EIO); |
| goto out; |
| } |
| bufv.buf[0].size = arg->size; |
| |
| se->op.write_buf(req, nodeid, &bufv, arg->offset, &fi); |
| |
| out: |
| /* Need to reset the pipe if ->write_buf() didn't consume all data */ |
| if ((ibuf->flags & FUSE_BUF_IS_FD) && bufv.idx < bufv.count) |
| fuse_ll_clear_pipe(se); |
| } |
| |
| static void do_flush(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) |
| { |
| struct fuse_flush_in *arg = (struct fuse_flush_in *) inarg; |
| struct fuse_file_info fi; |
| |
| memset(&fi, 0, sizeof(fi)); |
| fi.fh = arg->fh; |
| fi.flush = 1; |
| if (req->se->conn.proto_minor >= 7) |
| fi.lock_owner = arg->lock_owner; |
| |
| if (req->se->op.flush) |
| req->se->op.flush(req, nodeid, &fi); |
| else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_release(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) |
| { |
| struct fuse_release_in *arg = (struct fuse_release_in *) inarg; |
| struct fuse_file_info fi; |
| |
| memset(&fi, 0, sizeof(fi)); |
| fi.flags = arg->flags; |
| fi.fh = arg->fh; |
| if (req->se->conn.proto_minor >= 8) { |
| fi.flush = (arg->release_flags & FUSE_RELEASE_FLUSH) ? 1 : 0; |
| fi.lock_owner = arg->lock_owner; |
| } |
| if (arg->release_flags & FUSE_RELEASE_FLOCK_UNLOCK) { |
| fi.flock_release = 1; |
| fi.lock_owner = arg->lock_owner; |
| } |
| |
| if (req->se->op.release) |
| req->se->op.release(req, nodeid, &fi); |
| else |
| fuse_reply_err(req, 0); |
| } |
| |
| static void do_fsync(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) |
| { |
| struct fuse_fsync_in *arg = (struct fuse_fsync_in *) inarg; |
| struct fuse_file_info fi; |
| |
| memset(&fi, 0, sizeof(fi)); |
| fi.fh = arg->fh; |
| |
| if (req->se->op.fsync) |
| req->se->op.fsync(req, nodeid, arg->fsync_flags & 1, &fi); |
| else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_opendir(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) |
| { |
| struct fuse_open_in *arg = (struct fuse_open_in *) inarg; |
| struct fuse_file_info fi; |
| |
| memset(&fi, 0, sizeof(fi)); |
| fi.flags = arg->flags; |
| |
| if (req->se->op.opendir) |
| req->se->op.opendir(req, nodeid, &fi); |
| else |
| fuse_reply_open(req, &fi); |
| } |
| |
| static void do_readdir(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) |
| { |
| struct fuse_read_in *arg = (struct fuse_read_in *) inarg; |
| struct fuse_file_info fi; |
| |
| memset(&fi, 0, sizeof(fi)); |
| fi.fh = arg->fh; |
| |
| if (req->se->op.readdir) |
| req->se->op.readdir(req, nodeid, arg->size, arg->offset, &fi); |
| else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_readdirplus(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) |
| { |
| struct fuse_read_in *arg = (struct fuse_read_in *) inarg; |
| struct fuse_file_info fi; |
| |
| memset(&fi, 0, sizeof(fi)); |
| fi.fh = arg->fh; |
| |
| if (req->se->op.readdirplus) |
| req->se->op.readdirplus(req, nodeid, arg->size, arg->offset, &fi); |
| else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_releasedir(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) |
| { |
| struct fuse_release_in *arg = (struct fuse_release_in *) inarg; |
| struct fuse_file_info fi; |
| |
| memset(&fi, 0, sizeof(fi)); |
| fi.flags = arg->flags; |
| fi.fh = arg->fh; |
| |
| if (req->se->op.releasedir) |
| req->se->op.releasedir(req, nodeid, &fi); |
| else |
| fuse_reply_err(req, 0); |
| } |
| |
| static void do_fsyncdir(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) |
| { |
| struct fuse_fsync_in *arg = (struct fuse_fsync_in *) inarg; |
| struct fuse_file_info fi; |
| |
| memset(&fi, 0, sizeof(fi)); |
| fi.fh = arg->fh; |
| |
| if (req->se->op.fsyncdir) |
| req->se->op.fsyncdir(req, nodeid, arg->fsync_flags & 1, &fi); |
| else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_statfs(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) |
| { |
| (void) nodeid; |
| (void) inarg; |
| |
| if (req->se->op.statfs) |
| req->se->op.statfs(req, nodeid); |
| else { |
| struct statvfs buf = { |
| .f_namemax = 255, |
| .f_bsize = 512, |
| }; |
| fuse_reply_statfs(req, &buf); |
| } |
| } |
| |
| static void do_setxattr(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) |
| { |
| struct fuse_setxattr_in *arg = (struct fuse_setxattr_in *) inarg; |
| char *name = PARAM(arg); |
| char *value = name + strlen(name) + 1; |
| |
| if (req->se->op.setxattr) |
| req->se->op.setxattr(req, nodeid, name, value, arg->size, |
| arg->flags); |
| else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_getxattr(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) |
| { |
| struct fuse_getxattr_in *arg = (struct fuse_getxattr_in *) inarg; |
| |
| if (req->se->op.getxattr) |
| req->se->op.getxattr(req, nodeid, PARAM(arg), arg->size); |
| else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_listxattr(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) |
| { |
| struct fuse_getxattr_in *arg = (struct fuse_getxattr_in *) inarg; |
| |
| if (req->se->op.listxattr) |
| req->se->op.listxattr(req, nodeid, arg->size); |
| else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_removexattr(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) |
| { |
| char *name = (char *) inarg; |
| |
| if (req->se->op.removexattr) |
| req->se->op.removexattr(req, nodeid, name); |
| else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| 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, fuse_ino_t nodeid, const void *inarg) |
| { |
| struct fuse_lk_in *arg = (struct fuse_lk_in *) inarg; |
| struct fuse_file_info fi; |
| struct flock flock; |
| |
| memset(&fi, 0, sizeof(fi)); |
| fi.fh = arg->fh; |
| fi.lock_owner = arg->owner; |
| |
| convert_fuse_file_lock(&arg->lk, &flock); |
| if (req->se->op.getlk) |
| req->se->op.getlk(req, nodeid, &fi, &flock); |
| else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_setlk_common(fuse_req_t req, fuse_ino_t nodeid, |
| const void *inarg, int sleep) |
| { |
| struct fuse_lk_in *arg = (struct fuse_lk_in *) inarg; |
| struct fuse_file_info fi; |
| struct flock flock; |
| |
| memset(&fi, 0, sizeof(fi)); |
| 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; |
| |
| if (req->se->op.flock) |
| req->se->op.flock(req, nodeid, &fi, op); |
| else |
| fuse_reply_err(req, ENOSYS); |
| } else { |
| convert_fuse_file_lock(&arg->lk, &flock); |
| if (req->se->op.setlk) |
| req->se->op.setlk(req, nodeid, &fi, &flock, sleep); |
| else |
| fuse_reply_err(req, ENOSYS); |
| } |
| } |
| |
| static void do_setlk(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) |
| { |
| do_setlk_common(req, nodeid, inarg, 0); |
| } |
| |
| static void do_setlkw(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) |
| { |
| do_setlk_common(req, nodeid, inarg, 1); |
| } |
| |
| static int find_interrupted(struct fuse_session *se, struct fuse_req *req) |
| { |
| struct fuse_req *curr; |
| |
| for (curr = se->list.next; curr != &se->list; curr = curr->next) { |
| if (curr->unique == req->u.i.unique) { |
| fuse_interrupt_func_t func; |
| void *data; |
| |
| curr->ctr++; |
| pthread_mutex_unlock(&se->lock); |
| |
| /* Ugh, ugly locking */ |
| pthread_mutex_lock(&curr->lock); |
| pthread_mutex_lock(&se->lock); |
| curr->interrupted = 1; |
| func = curr->u.ni.func; |
| data = curr->u.ni.data; |
| pthread_mutex_unlock(&se->lock); |
| if (func) |
| func(curr, data); |
| pthread_mutex_unlock(&curr->lock); |
| |
| pthread_mutex_lock(&se->lock); |
| curr->ctr--; |
| if (!curr->ctr) |
| destroy_req(curr); |
| |
| return 1; |
| } |
| } |
| for (curr = se->interrupts.next; curr != &se->interrupts; |
| curr = curr->next) { |
| if (curr->u.i.unique == req->u.i.unique) |
| return 1; |
| } |
| return 0; |
| } |
| |
| static void do_interrupt(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) |
| { |
| struct fuse_interrupt_in *arg = (struct fuse_interrupt_in *) inarg; |
| struct fuse_session *se = req->se; |
| |
| (void) nodeid; |
| if (se->debug) |
| fprintf(stderr, "INTERRUPT: %llu\n", |
| (unsigned long long) arg->unique); |
| |
| req->u.i.unique = arg->unique; |
| |
| pthread_mutex_lock(&se->lock); |
| if (find_interrupted(se, req)) |
| destroy_req(req); |
| else |
| list_add_req(req, &se->interrupts); |
| pthread_mutex_unlock(&se->lock); |
| } |
| |
| static struct fuse_req *check_interrupt(struct fuse_session *se, |
| struct fuse_req *req) |
| { |
| struct fuse_req *curr; |
| |
| for (curr = se->interrupts.next; curr != &se->interrupts; |
| curr = curr->next) { |
| if (curr->u.i.unique == req->unique) { |
| req->interrupted = 1; |
| list_del_req(curr); |
| free(curr); |
| return NULL; |
| } |
| } |
| curr = se->interrupts.next; |
| if (curr != &se->interrupts) { |
| list_del_req(curr); |
| list_init_req(curr); |
| return curr; |
| } else |
| return NULL; |
| } |
| |
| static void do_bmap(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) |
| { |
| struct fuse_bmap_in *arg = (struct fuse_bmap_in *) inarg; |
| |
| if (req->se->op.bmap) |
| req->se->op.bmap(req, nodeid, arg->blocksize, arg->block); |
| else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_ioctl(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) |
| { |
| struct fuse_ioctl_in *arg = (struct fuse_ioctl_in *) inarg; |
| unsigned int flags = arg->flags; |
| void *in_buf = arg->in_size ? PARAM(arg) : NULL; |
| struct fuse_file_info fi; |
| |
| if (flags & FUSE_IOCTL_DIR && |
| !(req->se->conn.want & FUSE_CAP_IOCTL_DIR)) { |
| fuse_reply_err(req, ENOTTY); |
| return; |
| } |
| |
| memset(&fi, 0, sizeof(fi)); |
| fi.fh = arg->fh; |
| |
| if (sizeof(void *) == 4 && req->se->conn.proto_minor >= 16 && |
| !(flags & FUSE_IOCTL_32BIT)) { |
| req->ioctl_64bit = 1; |
| } |
| |
| if (req->se->op.ioctl) |
| req->se->op.ioctl(req, nodeid, arg->cmd, |
| (void *)(uintptr_t)arg->arg, &fi, flags, |
| in_buf, arg->in_size, arg->out_size); |
| else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| void fuse_pollhandle_destroy(struct fuse_pollhandle *ph) |
| { |
| free(ph); |
| } |
| |
| static void do_poll(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) |
| { |
| struct fuse_poll_in *arg = (struct fuse_poll_in *) inarg; |
| struct fuse_file_info fi; |
| |
| memset(&fi, 0, sizeof(fi)); |
| fi.fh = arg->fh; |
| fi.poll_events = arg->events; |
| |
| if (req->se->op.poll) { |
| struct fuse_pollhandle *ph = NULL; |
| |
| if (arg->flags & FUSE_POLL_SCHEDULE_NOTIFY) { |
| ph = malloc(sizeof(struct fuse_pollhandle)); |
| if (ph == NULL) { |
| fuse_reply_err(req, ENOMEM); |
| return; |
| } |
| ph->kh = arg->kh; |
| ph->se = req->se; |
| } |
| |
| req->se->op.poll(req, nodeid, &fi, ph); |
| } else { |
| fuse_reply_err(req, ENOSYS); |
| } |
| } |
| |
| static void do_fallocate(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) |
| { |
| struct fuse_fallocate_in *arg = (struct fuse_fallocate_in *) inarg; |
| struct fuse_file_info fi; |
| |
| memset(&fi, 0, sizeof(fi)); |
| fi.fh = arg->fh; |
| |
| if (req->se->op.fallocate) |
| req->se->op.fallocate(req, nodeid, arg->mode, arg->offset, arg->length, &fi); |
| else |
| fuse_reply_err(req, ENOSYS); |
| } |
| |
| static void do_init(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) |
| { |
| struct fuse_init_in *arg = (struct fuse_init_in *) inarg; |
| struct fuse_init_out outarg; |
| struct fuse_session *se = req->se; |
| size_t bufsize = se->bufsize; |
| size_t outargsize = sizeof(outarg); |
| |
| (void) nodeid; |
| if (se->debug) { |
| fprintf(stderr, "INIT: %u.%u\n", arg->major, arg->minor); |
| if (arg->major == 7 && arg->minor >= 6) { |
| fprintf(stderr, "flags=0x%08x\n", arg->flags); |
| fprintf(stderr, "max_readahead=0x%08x\n", |
| arg->max_readahead); |
| } |
| } |
| se->conn.proto_major = arg->major; |
| se->conn.proto_minor = arg->minor; |
| se->conn.capable = 0; |
| se->conn.want = 0; |
| |
| memset(&outarg, 0, sizeof(outarg)); |
| outarg.major = FUSE_KERNEL_VERSION; |
| outarg.minor = FUSE_KERNEL_MINOR_VERSION; |
| |
| 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 < se->conn.max_readahead) |
| se->conn.max_readahead = arg->max_readahead; |
| if (arg->flags & FUSE_ASYNC_READ) |
| se->conn.capable |= FUSE_CAP_ASYNC_READ; |
| if (arg->flags & FUSE_POSIX_LOCKS) |
| se->conn.capable |= FUSE_CAP_POSIX_LOCKS; |
| if (arg->flags & FUSE_ATOMIC_O_TRUNC) |
| se->conn.capable |= FUSE_CAP_ATOMIC_O_TRUNC; |
| if (arg->flags & FUSE_EXPORT_SUPPORT) |
| se->conn.capable |= FUSE_CAP_EXPORT_SUPPORT; |
| if (arg->flags & FUSE_DONT_MASK) |
| se->conn.capable |= FUSE_CAP_DONT_MASK; |
| if (arg->flags & FUSE_FLOCK_LOCKS) |
| se->conn.capable |= FUSE_CAP_FLOCK_LOCKS; |
| if (arg->flags & FUSE_AUTO_INVAL_DATA) |
| se->conn.capable |= FUSE_CAP_AUTO_INVAL_DATA; |
| if (arg->flags & FUSE_DO_READDIRPLUS) |
| se->conn.capable |= FUSE_CAP_READDIRPLUS; |
| if (arg->flags & FUSE_READDIRPLUS_AUTO) |
| se->conn.capable |= FUSE_CAP_READDIRPLUS_AUTO; |
| if (arg->flags & FUSE_ASYNC_DIO) |
| se->conn.capable |= FUSE_CAP_ASYNC_DIO; |
| if (arg->flags & FUSE_WRITEBACK_CACHE) |
| se->conn.capable |= FUSE_CAP_WRITEBACK_CACHE; |
| if (arg->flags & FUSE_NO_OPEN_SUPPORT) |
| se->conn.capable |= FUSE_CAP_NO_OPEN_SUPPORT; |
| if (arg->flags & FUSE_PARALLEL_DIROPS) |
| se->conn.capable |= FUSE_CAP_PARALLEL_DIROPS; |
| if (arg->flags & FUSE_POSIX_ACL) |
| se->conn.capable |= FUSE_CAP_POSIX_ACL; |
| if (arg->flags & FUSE_HANDLE_KILLPRIV) |
| se->conn.capable |= FUSE_CAP_HANDLE_KILLPRIV; |
| } else { |
| se->conn.max_readahead = 0; |
| } |
| |
| if (se->conn.proto_minor >= 14) { |
| #ifdef HAVE_SPLICE |
| #ifdef HAVE_VMSPLICE |
| se->conn.capable |= FUSE_CAP_SPLICE_WRITE | FUSE_CAP_SPLICE_MOVE; |
| #endif |
| se->conn.capable |= FUSE_CAP_SPLICE_READ; |
| #endif |
| } |
| if (se->conn.proto_minor >= 18) |
| se->conn.capable |= FUSE_CAP_IOCTL_DIR; |
| |
| /* Default settings for modern filesystems. |
| * |
| * Most of these capabilities were disabled by default in |
| * libfuse2 for backwards compatibility reasons. In libfuse3, |
| * we can finally enable them by default (as long as they're |
| * supported by the kernel). |
| */ |
| #define LL_SET_DEFAULT(cond, cap) \ |
| if ((cond) && (se->conn.capable & (cap))) \ |
| se->conn.want |= (cap) |
| LL_SET_DEFAULT(1, FUSE_CAP_ASYNC_READ); |
| LL_SET_DEFAULT(1, FUSE_CAP_PARALLEL_DIROPS); |
| LL_SET_DEFAULT(1, FUSE_CAP_AUTO_INVAL_DATA); |
| LL_SET_DEFAULT(1, FUSE_CAP_HANDLE_KILLPRIV); |
| LL_SET_DEFAULT(1, FUSE_CAP_ASYNC_DIO); |
| LL_SET_DEFAULT(1, FUSE_CAP_IOCTL_DIR); |
| LL_SET_DEFAULT(1, FUSE_CAP_ATOMIC_O_TRUNC); |
| LL_SET_DEFAULT(se->op.write_buf, FUSE_CAP_SPLICE_READ); |
| LL_SET_DEFAULT(se->op.getlk && se->op.setlk, |
| FUSE_CAP_POSIX_LOCKS); |
| LL_SET_DEFAULT(se->op.flock, FUSE_CAP_FLOCK_LOCKS); |
| LL_SET_DEFAULT(se->op.readdirplus, FUSE_CAP_READDIRPLUS); |
| LL_SET_DEFAULT(se->op.readdirplus, FUSE_CAP_READDIRPLUS_AUTO); |
| |
| if (bufsize < FUSE_MIN_READ_BUFFER) { |
| fprintf(stderr, "fuse: warning: buffer size too small: %zu\n", |
| bufsize); |
| bufsize = FUSE_MIN_READ_BUFFER; |
| } |
| |
| bufsize -= 4096; |
| if (bufsize < se->conn.max_write) |
| se->conn.max_write = bufsize; |
| |
| se->got_init = 1; |
| if (se->op.init) |
| se->op.init(se->userdata, &se->conn); |
| |
| if (se->conn.want & (~se->conn.capable)) { |
| fprintf(stderr, "fuse: error: filesystem requested capabilites " |
| "that are not supported by kernel, aborting.\n"); |
| fuse_reply_err(req, EPROTO); |
| se->error = -EPROTO; |
| fuse_session_exit(se); |
| return; |
| } |
| |
| unsigned max_read_mo = get_max_read(se->mo); |
| if (se->conn.max_read != max_read_mo) { |
| fprintf(stderr, "fuse: error: init() and fuse_session_new() " |
| "requested different maximum read size (%u vs %u)\n", |
| se->conn.max_read, max_read_mo); |
| fuse_reply_err(req, EPROTO); |
| se->error = -EPROTO; |
| fuse_session_exit(se); |
| return; |
| } |
| |
| /* Always enable big writes, this is superseded |
| by the max_write option */ |
| outarg.flags |= FUSE_BIG_WRITES; |
| |
| if (se->conn.want & FUSE_CAP_ASYNC_READ) |
| outarg.flags |= FUSE_ASYNC_READ; |
| if (se->conn.want & FUSE_CAP_POSIX_LOCKS) |
| outarg.flags |= FUSE_POSIX_LOCKS; |
| if (se->conn.want & FUSE_CAP_ATOMIC_O_TRUNC) |
| outarg.flags |= FUSE_ATOMIC_O_TRUNC; |
| if (se->conn.want & FUSE_CAP_EXPORT_SUPPORT) |
| outarg.flags |= FUSE_EXPORT_SUPPORT; |
| if (se->conn.want & FUSE_CAP_DONT_MASK) |
| outarg.flags |= FUSE_DONT_MASK; |
| if (se->conn.want & FUSE_CAP_FLOCK_LOCKS) |
| outarg.flags |= FUSE_FLOCK_LOCKS; |
| if (se->conn.want & FUSE_CAP_AUTO_INVAL_DATA) |
| outarg.flags |= FUSE_AUTO_INVAL_DATA; |
| if (se->conn.want & FUSE_CAP_READDIRPLUS) |
| outarg.flags |= FUSE_DO_READDIRPLUS; |
| if (se->conn.want & FUSE_CAP_READDIRPLUS_AUTO) |
| outarg.flags |= FUSE_READDIRPLUS_AUTO; |
| if (se->conn.want & FUSE_CAP_ASYNC_DIO) |
| outarg.flags |= FUSE_ASYNC_DIO; |
| if (se->conn.want & FUSE_CAP_WRITEBACK_CACHE) |
| outarg.flags |= FUSE_WRITEBACK_CACHE; |
| outarg.max_readahead = se->conn.max_readahead; |
| outarg.max_write = se->conn.max_write; |
| if (se->conn.proto_minor >= 13) { |
| if (se->conn.max_background >= (1 << 16)) |
| se->conn.max_background = (1 << 16) - 1; |
| if (se->conn.congestion_threshold > se->conn.max_background) |
| se->conn.congestion_threshold = se->conn.max_background; |
| if (!se->conn.congestion_threshold) { |
| se->conn.congestion_threshold = |
| se->conn.max_background * 3 / 4; |
| } |
| |
| outarg.max_background = se->conn.max_background; |
| outarg.congestion_threshold = se->conn.congestion_threshold; |
| } |
| if (se->conn.proto_minor >= 23) |
| outarg.time_gran = se->conn.time_gran; |
| |
| if (se->debug) { |
| fprintf(stderr, " INIT: %u.%u\n", outarg.major, outarg.minor); |
| fprintf(stderr, " flags=0x%08x\n", outarg.flags); |
| fprintf(stderr, " max_readahead=0x%08x\n", |
| outarg.max_readahead); |
| fprintf(stderr, " max_write=0x%08x\n", outarg.max_write); |
| fprintf(stderr, " max_background=%i\n", |
| outarg.max_background); |
| fprintf(stderr, " congestion_threshold=%i\n", |
| outarg.congestion_threshold); |
| fprintf(stderr, " time_gran=%u\n", |
| outarg.time_gran); |
| } |
| if (arg->minor < 5) |
| outargsize = FUSE_COMPAT_INIT_OUT_SIZE; |
| else if (arg->minor < 23) |
| outargsize = FUSE_COMPAT_22_INIT_OUT_SIZE; |
| |
| send_reply_ok(req, &outarg, outargsize); |
| } |
| |
| static void do_destroy(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) |
| { |
| struct fuse_session *se = req->se; |
| |
| (void) nodeid; |
| (void) inarg; |
| |
| se->got_destroy = 1; |
| if (se->op.destroy) |
| se->op.destroy(se->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, fuse_ino_t nodeid, |
| const void *inarg, const struct fuse_buf *buf) |
| { |
| struct fuse_session *se = req->se; |
| struct fuse_notify_req *nreq; |
| struct fuse_notify_req *head; |
| |
| pthread_mutex_lock(&se->lock); |
| head = &se->notify_list; |
| for (nreq = head->next; nreq != head; nreq = nreq->next) { |
| if (nreq->unique == req->unique) { |
| list_del_nreq(nreq); |
| break; |
| } |
| } |
| pthread_mutex_unlock(&se->lock); |
| |
| if (nreq != head) |
| nreq->reply(nreq, req, nodeid, inarg, buf); |
| } |
| |
| static int send_notify_iov(struct fuse_session *se, int notify_code, |
| struct iovec *iov, int count) |
| { |
| struct fuse_out_header out; |
| |
| if (!se->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(se, NULL, iov, count); |
| } |
| |
| int fuse_lowlevel_notify_poll(struct fuse_pollhandle *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->se, FUSE_NOTIFY_POLL, iov, 2); |
| } else { |
| return 0; |
| } |
| } |
| |
| int fuse_lowlevel_notify_inval_inode(struct fuse_session *se, fuse_ino_t ino, |
| off_t off, off_t len) |
| { |
| struct fuse_notify_inval_inode_out outarg; |
| struct iovec iov[2]; |
| |
| if (!se) |
| return -EINVAL; |
| |
| outarg.ino = ino; |
| outarg.off = off; |
| outarg.len = len; |
| |
| iov[1].iov_base = &outarg; |
| iov[1].iov_len = sizeof(outarg); |
| |
| return send_notify_iov(se, FUSE_NOTIFY_INVAL_INODE, iov, 2); |
| } |
| |
| int fuse_lowlevel_notify_inval_entry(struct fuse_session *se, fuse_ino_t parent, |
| const char *name, size_t namelen) |
| { |
| struct fuse_notify_inval_entry_out outarg; |
| struct iovec iov[3]; |
| |
| if (!se) |
| return -EINVAL; |
| |
| outarg.parent = parent; |
| 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(se, FUSE_NOTIFY_INVAL_ENTRY, iov, 3); |
| } |
| |
| int fuse_lowlevel_notify_delete(struct fuse_session *se, |
| fuse_ino_t parent, fuse_ino_t child, |
| const char *name, size_t namelen) |
| { |
| struct fuse_notify_delete_out outarg; |
| struct iovec iov[3]; |
| |
| if (!se) |
| return -EINVAL; |
| |
| if (se->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(se, FUSE_NOTIFY_DELETE, iov, 3); |
| } |
| |
| int fuse_lowlevel_notify_store(struct fuse_session *se, fuse_ino_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 iovec iov[3]; |
| size_t size = fuse_buf_size(bufv); |
| int res; |
| |
| if (!se) |
| return -EINVAL; |
| |
| if (se->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(se, NULL, 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, fuse_ino_t ino, |
| const void *inarg, |
| const struct fuse_buf *ibuf) |
| { |
| struct fuse_session *se = req->se; |
| struct fuse_retrieve_req *rreq = |
| container_of(nreq, struct fuse_retrieve_req, nreq); |
| const struct fuse_notify_retrieve_in *arg = inarg; |
| struct fuse_bufvec bufv = { |
| .buf[0] = *ibuf, |
| .count = 1, |
| }; |
| |
| if (!(bufv.buf[0].flags & FUSE_BUF_IS_FD)) |
| bufv.buf[0].mem = PARAM(arg); |
| |
| bufv.buf[0].size -= sizeof(struct fuse_in_header) + |
| sizeof(struct fuse_notify_retrieve_in); |
| |
| if (bufv.buf[0].size < arg->size) { |
| fprintf(stderr, "fuse: retrieve reply: buffer size too small\n"); |
| fuse_reply_none(req); |
| goto out; |
| } |
| bufv.buf[0].size = arg->size; |
| |
| if (se->op.retrieve_reply) { |
| se->op.retrieve_reply(req, rreq->cookie, ino, |
| arg->offset, &bufv); |
| } else { |
| fuse_reply_none(req); |
| } |
| out: |
| free(rreq); |
| if ((ibuf->flags & FUSE_BUF_IS_FD) && bufv.idx < bufv.count) |
| fuse_ll_clear_pipe(se); |
| } |
| |
| int fuse_lowlevel_notify_retrieve(struct fuse_session *se, fuse_ino_t ino, |
| size_t size, off_t offset, void *cookie) |
| { |
| struct fuse_notify_retrieve_out outarg; |
| struct iovec iov[2]; |
| struct fuse_retrieve_req *rreq; |
| int err; |
| |
| if (!se) |
| return -EINVAL; |
| |
| if (se->conn.proto_minor < 15) |
| return -ENOSYS; |
| |
| rreq = malloc(sizeof(*rreq)); |
| if (rreq == NULL) |
| return -ENOMEM; |
| |
| pthread_mutex_lock(&se->lock); |
| rreq->cookie = cookie; |
| rreq->nreq.unique = se->notify_ctr++; |
| rreq->nreq.reply = fuse_ll_retrieve_reply; |
| list_add_nreq(&rreq->nreq, &se->notify_list); |
| pthread_mutex_unlock(&se->lock); |
| |
| outarg.notify_unique = rreq->nreq.unique; |
| outarg.nodeid = ino; |
| outarg.offset = offset; |
| outarg.size = size; |
| outarg.padding = 0; |
| |
| iov[1].iov_base = &outarg; |
| iov[1].iov_len = sizeof(outarg); |
| |
| err = send_notify_iov(se, FUSE_NOTIFY_RETRIEVE, iov, 2); |
| if (err) { |
| pthread_mutex_lock(&se->lock); |
| list_del_nreq(&rreq->nreq); |
| pthread_mutex_unlock(&se->lock); |
| free(rreq); |
| } |
| |
| return err; |
| } |
| |
| void *fuse_req_userdata(fuse_req_t req) |
| { |
| return req->se->userdata; |
| } |
| |
| const struct fuse_ctx *fuse_req_ctx(fuse_req_t req) |
| { |
| return &req->ctx; |
| } |
| |
| void fuse_req_interrupt_func(fuse_req_t req, fuse_interrupt_func_t func, |
| void *data) |
| { |
| pthread_mutex_lock(&req->lock); |
| pthread_mutex_lock(&req->se->lock); |
| req->u.ni.func = func; |
| req->u.ni.data = data; |
| pthread_mutex_unlock(&req->se->lock); |
| if (req->interrupted && func) |
| func(req, data); |
| pthread_mutex_unlock(&req->lock); |
| } |
| |
| int fuse_req_interrupted(fuse_req_t req) |
| { |
| int interrupted; |
| |
| pthread_mutex_lock(&req->se->lock); |
| interrupted = req->interrupted; |
| pthread_mutex_unlock(&req->se->lock); |
| |
| return interrupted; |
| } |
| |
| static struct { |
| void (*func)(fuse_req_t, fuse_ino_t, const void *); |
| 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_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] = { (void *) 1, "NOTIFY_REPLY" }, |
| [FUSE_BATCH_FORGET] = { do_batch_forget, "BATCH_FORGET" }, |
| [FUSE_READDIRPLUS] = { do_readdirplus, "READDIRPLUS"}, |
| [FUSE_RENAME2] = { do_rename2, "RENAME2" }, |
| [CUSE_INIT] = { cuse_lowlevel_init, "CUSE_INIT" }, |
| }; |
| |
| #define FUSE_MAXOP (sizeof(fuse_ll_ops) / sizeof(fuse_ll_ops[0])) |
| |
| static const char *opname(enum fuse_opcode opcode) |
| { |
| if (opcode >= FUSE_MAXOP || !fuse_ll_ops[opcode].name) |
| return "???"; |
| else |
| return fuse_ll_ops[opcode].name; |
| } |
| |
| static int fuse_ll_copy_from_pipe(struct fuse_bufvec *dst, |
| struct fuse_bufvec *src) |
| { |
| int res = fuse_buf_copy(dst, src, 0); |
| if (res < 0) { |
| fprintf(stderr, "fuse: copy from pipe: %s\n", strerror(-res)); |
| return res; |
| } |
| if (res < fuse_buf_size(dst)) { |
| fprintf(stderr, "fuse: copy from pipe: short read\n"); |
| return -1; |
| } |
| return 0; |
| } |
| |
| void fuse_session_process_buf(struct fuse_session *se, |
| const struct fuse_buf *buf) |
| { |
| fuse_session_process_buf_int(se, buf, NULL); |
| } |
| |
| void fuse_session_process_buf_int(struct fuse_session *se, |
| const struct fuse_buf *buf, struct fuse_chan *ch) |
| { |
| const size_t write_header_size = sizeof(struct fuse_in_header) + |
| sizeof(struct fuse_write_in); |
| struct fuse_bufvec bufv = { .buf[0] = *buf, .count = 1 }; |
| struct fuse_bufvec tmpbuf = FUSE_BUFVEC_INIT(write_header_size); |
| struct fuse_in_header *in; |
| const void *inarg; |
| struct fuse_req *req; |
| void *mbuf = NULL; |
| int err; |
| int res; |
| |
| if (buf->flags & FUSE_BUF_IS_FD) { |
| if (buf->size < tmpbuf.buf[0].size) |
| tmpbuf.buf[0].size = buf->size; |
| |
| mbuf = malloc(tmpbuf.buf[0].size); |
| if (mbuf == NULL) { |
| fprintf(stderr, "fuse: failed to allocate header\n"); |
| goto clear_pipe; |
| } |
| tmpbuf.buf[0].mem = mbuf; |
| |
| res = fuse_ll_copy_from_pipe(&tmpbuf, &bufv); |
| if (res < 0) |
| goto clear_pipe; |
| |
| in = mbuf; |
| } else { |
| in = buf->mem; |
| } |
| |
| if (se->debug) { |
| fprintf(stderr, |
| "unique: %llu, opcode: %s (%i), nodeid: %llu, insize: %zu, pid: %u\n", |
| (unsigned long long) in->unique, |
| opname((enum fuse_opcode) in->opcode), in->opcode, |
| (unsigned long long) in->nodeid, buf->size, in->pid); |
| } |
| |
| req = fuse_ll_alloc_req(se); |
| if (req == NULL) { |
| struct fuse_out_header out = { |
| .unique = in->unique, |
| .error = -ENOMEM, |
| }; |
| struct iovec iov = { |
| .iov_base = &out, |
| .iov_len = sizeof(struct fuse_out_header), |
| }; |
| |
| fuse_send_msg(se, ch, &iov, 1); |
| goto clear_pipe; |
| } |
| |
| req->unique = in->unique; |
| req->ctx.uid = in->uid; |
| req->ctx.gid = in->gid; |
| req->ctx.pid = in->pid; |
| req->ch = ch ? fuse_chan_get(ch) : NULL; |
| |
| err = EIO; |
| if (!se->got_init) { |
| enum fuse_opcode expected; |
| |
| expected = se->cuse_data ? CUSE_INIT : FUSE_INIT; |
| if (in->opcode != expected) |
| goto reply_err; |
| } else if (in->opcode == FUSE_INIT || in->opcode == CUSE_INIT) |
| goto reply_err; |
| |
| err = EACCES; |
| /* Implement -o allow_root */ |
| if (se->deny_others && in->uid != se->owner && in->uid != 0 && |
| in->opcode != FUSE_INIT && in->opcode != FUSE_READ && |
| in->opcode != FUSE_WRITE && in->opcode != FUSE_FSYNC && |
| in->opcode != FUSE_RELEASE && in->opcode != FUSE_READDIR && |
| in->opcode != FUSE_FSYNCDIR && in->opcode != FUSE_RELEASEDIR && |
| in->opcode != FUSE_NOTIFY_REPLY && |
| in->opcode != FUSE_READDIRPLUS) |
| goto reply_err; |
| |
| err = ENOSYS; |
| if (in->opcode >= FUSE_MAXOP || !fuse_ll_ops[in->opcode].func) |
| goto reply_err; |
| if (in->opcode != FUSE_INTERRUPT) { |
| struct fuse_req *intr; |
| pthread_mutex_lock(&se->lock); |
| intr = check_interrupt(se, req); |
| list_add_req(req, &se->list); |
| pthread_mutex_unlock(&se->lock); |
| if (intr) |
| fuse_reply_err(intr, EAGAIN); |
| } |
| |
| if ((buf->flags & FUSE_BUF_IS_FD) && write_header_size < buf->size && |
| (in->opcode != FUSE_WRITE || !se->op.write_buf) && |
| in->opcode != FUSE_NOTIFY_REPLY) { |
| void *newmbuf; |
| |
| err = ENOMEM; |
| newmbuf = realloc(mbuf, buf->size); |
| if (newmbuf == NULL) |
| goto reply_err; |
| mbuf = newmbuf; |
| |
| tmpbuf = FUSE_BUFVEC_INIT(buf->size - write_header_size); |
| tmpbuf.buf[0].mem = mbuf + write_header_size; |
| |
| res = fuse_ll_copy_from_pipe(&tmpbuf, &bufv); |
| err = -res; |
| if (res < 0) |
| goto reply_err; |
| |
| in = mbuf; |
| } |
| |
| inarg = (void *) &in[1]; |
| if (in->opcode == FUSE_WRITE && se->op.write_buf) |
| do_write_buf(req, in->nodeid, inarg, buf); |
| else if (in->opcode == FUSE_NOTIFY_REPLY) |
| do_notify_reply(req, in->nodeid, inarg, buf); |
| else |
| fuse_ll_ops[in->opcode].func(req, in->nodeid, inarg); |
| |
| out_free: |
| free(mbuf); |
| return; |
| |
| reply_err: |
| fuse_reply_err(req, err); |
| clear_pipe: |
| if (buf->flags & FUSE_BUF_IS_FD) |
| fuse_ll_clear_pipe(se); |
| goto out_free; |
| } |
| |
| #define LL_OPTION(n,o,v) \ |
| { n, offsetof(struct fuse_session, o), v } |
| |
| static const struct fuse_opt fuse_ll_opts[] = { |
| LL_OPTION("debug", debug, 1), |
| LL_OPTION("-d", debug, 1), |
| LL_OPTION("--debug", debug, 1), |
| LL_OPTION("allow_root", deny_others, 1), |
| FUSE_OPT_END |
| }; |
| |
| void fuse_lowlevel_version(void) |
| { |
| printf("using FUSE kernel interface version %i.%i\n", |
| FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION); |
| fuse_mount_version(); |
| } |
| |
| void fuse_lowlevel_help(void) |
| { |
| /* These are not all options, but the ones that are |
| potentially of interest to an end-user */ |
| printf( |
| " -o allow_other allow access by all users\n" |
| " -o allow_root allow access by root\n" |
| " -o auto_unmount auto unmount on process termination\n"); |
| } |
| |
| void fuse_session_destroy(struct fuse_session *se) |
| { |
| struct fuse_ll_pipe *llp; |
| |
| if (se->got_init && !se->got_destroy) { |
| if (se->op.destroy) |
| se->op.destroy(se->userdata); |
| } |
| llp = pthread_getspecific(se->pipe_key); |
| if (llp != NULL) |
| fuse_ll_pipe_free(llp); |
| pthread_key_delete(se->pipe_key); |
| pthread_mutex_destroy(&se->lock); |
| free(se->cuse_data); |
| if (se->fd != -1) |
| close(se->fd); |
| destroy_mount_opts(se->mo); |
| free(se); |
| } |
| |
| |
| static void fuse_ll_pipe_destructor(void *data) |
| { |
| struct fuse_ll_pipe *llp = data; |
| fuse_ll_pipe_free(llp); |
| } |
| |
| int fuse_session_receive_buf(struct fuse_session *se, struct fuse_buf *buf) |
| { |
| return fuse_session_receive_buf_int(se, buf, NULL); |
| } |
| |
| int fuse_session_receive_buf_int(struct fuse_session *se, struct fuse_buf *buf, |
| struct fuse_chan *ch) |
| { |
| int err; |
| ssize_t res; |
| #ifdef HAVE_SPLICE |
| size_t bufsize = se->bufsize; |
| struct fuse_ll_pipe *llp; |
| struct fuse_buf tmpbuf; |
| |
| if (se->conn.proto_minor < 14 || !(se->conn.want & FUSE_CAP_SPLICE_READ)) |
| goto fallback; |
| |
| llp = fuse_ll_get_pipe(se); |
| if (llp == NULL) |
| goto fallback; |
| |
| if (llp->size < bufsize) { |
| if (llp->can_grow) { |
| res = fcntl(llp->pipe[0], F_SETPIPE_SZ, bufsize); |
| if (res == -1) { |
| llp->can_grow = 0; |
| goto fallback; |
| } |
| llp->size = res; |
| } |
| if (llp->size < bufsize) |
| goto fallback; |
| } |
| |
| res = splice(ch ? ch->fd : se->fd, |
| NULL, llp->pipe[1], NULL, bufsize, 0); |
| err = errno; |
| |
| if (fuse_session_exited(se)) |
| return 0; |
| |
| if (res == -1) { |
| if (err == ENODEV) { |
| /* Filesystem was unmounted, or connection was aborted |
| via /sys/fs/fuse/connections */ |
| fuse_session_exit(se); |
| return 0; |
| } |
| if (err != EINTR && err != EAGAIN) |
| perror("fuse: splice from device"); |
| return -err; |
| } |
| |
| if (res < sizeof(struct fuse_in_header)) { |
| fprintf(stderr, "short splice from fuse device\n"); |
| return -EIO; |
| } |
| |
| tmpbuf = (struct fuse_buf) { |
| .size = res, |
| .flags = FUSE_BUF_IS_FD, |
| .fd = llp->pipe[0], |
| }; |
| |
| /* |
| * Don't bother with zero copy for small requests. |
| * fuse_loop_mt() needs to check for FORGET so this more than |
| * just an optimization. |
| */ |
| if (res < sizeof(struct fuse_in_header) + |
| sizeof(struct fuse_write_in) + pagesize) { |
| struct fuse_bufvec src = { .buf[0] = tmpbuf, .count = 1 }; |
| struct fuse_bufvec dst = { .count = 1 }; |
| |
| if (!buf->mem) { |
| buf->mem = malloc(se->bufsize); |
| if (!buf->mem) { |
| fprintf(stderr, |
| "fuse: failed to allocate read buffer\n"); |
| return -ENOMEM; |
| } |
| } |
| buf->size = se->bufsize; |
| buf->flags = 0; |
| dst.buf[0] = *buf; |
| |
| res = fuse_buf_copy(&dst, &src, 0); |
| if (res < 0) { |
| fprintf(stderr, "fuse: copy from pipe: %s\n", |
| strerror(-res)); |
| fuse_ll_clear_pipe(se); |
| return res; |
| } |
| if (res < tmpbuf.size) { |
| fprintf(stderr, "fuse: copy from pipe: short read\n"); |
| fuse_ll_clear_pipe(se); |
| return -EIO; |
| } |
| assert(res == tmpbuf.size); |
| |
| } else { |
| /* Don't overwrite buf->mem, as that would cause a leak */ |
| buf->fd = tmpbuf.fd; |
| buf->flags = tmpbuf.flags; |
| } |
| buf->size = tmpbuf.size; |
| |
| return res; |
| |
| fallback: |
| #endif |
| if (!buf->mem) { |
| buf->mem = malloc(se->bufsize); |
| if (!buf->mem) { |
| fprintf(stderr, |
| "fuse: failed to allocate read buffer\n"); |
| return -ENOMEM; |
| } |
| } |
| |
| restart: |
| res = read(ch ? ch->fd : se->fd, buf->mem, se->bufsize); |
| err = errno; |
| |
| if (fuse_session_exited(se)) |
| return 0; |
| if (res == -1) { |
| /* ENOENT means the operation was interrupted, it's safe |
| to restart */ |
| if (err == ENOENT) |
| goto restart; |
| |
| if (err == ENODEV) { |
| /* Filesystem was unmounted, or connection was aborted |
| via /sys/fs/fuse/connections */ |
| fuse_session_exit(se); |
| return 0; |
| } |
| /* Errors occurring during normal operation: EINTR (read |
| interrupted), EAGAIN (nonblocking I/O), ENODEV (filesystem |
| umounted) */ |
| if (err != EINTR && err != EAGAIN) |
| perror("fuse: reading device"); |
| return -err; |
| } |
| if ((size_t) res < sizeof(struct fuse_in_header)) { |
| fprintf(stderr, "short read on fuse device\n"); |
| return -EIO; |
| } |
| |
| buf->size = res; |
| |
| return res; |
| } |
| |
| #define MIN_BUFSIZE 0x21000 |
| |
| struct fuse_session *fuse_session_new(struct fuse_args *args, |
| const struct fuse_lowlevel_ops *op, |
| size_t op_size, void *userdata) |
| { |
| int err; |
| struct fuse_session *se; |
| struct mount_opts *mo; |
| |
| 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); |
| } |
| |
| if (args->argc == 0) { |
| fprintf(stderr, "fuse: empty argv passed to fuse_session_new().\n"); |
| return NULL; |
| } |
| |
| se = (struct fuse_session *) calloc(1, sizeof(struct fuse_session)); |
| if (se == NULL) { |
| fprintf(stderr, "fuse: failed to allocate fuse object\n"); |
| goto out1; |
| } |
| se->fd = -1; |
| se->conn.max_write = UINT_MAX; |
| se->conn.max_readahead = UINT_MAX; |
| |
| /* Parse options */ |
| if(fuse_opt_parse(args, se, fuse_ll_opts, NULL) == -1) |
| goto out2; |
| if(se->deny_others) { |
| /* Allowing access only by root is done by instructing |
| * kernel to allow access by everyone, and then restricting |
| * access to root and mountpoint owner in libfuse. |
| */ |
| // We may be adding the option a second time, but |
| // that doesn't hurt. |
| if(fuse_opt_add_arg(args, "-oallow_other") == -1) |
| goto out2; |
| } |
| mo = parse_mount_opts(args); |
| if (
|