148 files changed, 141286 insertions, 0 deletions
diff --git a/libfuse-lite/fuse_lowlevel.c b/libfuse-lite/fuse_lowlevel.c new file mode 100755 index 0000000..f6530c1 --- a/dev/null +++ b/libfuse-lite/fuse_lowlevel.c @@ -0,0 +1,1395 @@ +/* + FUSE: Filesystem in Userspace + Copyright (C) 2001-2007 Miklos Szeredi <miklos@szeredi.hu> + + This program can be distributed under the terms of the GNU LGPLv2. + See the file COPYING.LIB +*/ + +#include "config.h" +#include "fuse_lowlevel.h" +#include "fuse_kernel.h" +#include "fuse_opt.h" +#include "fuse_i.h" +#include "fuse_misc.h" +#include "fuse_lowlevel_compat.h" + +#include <stdio.h> +#include <stdlib.h> +#include <stddef.h> +#include <string.h> +#include <unistd.h> +#include <limits.h> +#include <errno.h> + +#define PARAM(inarg) (((const char *)(inarg)) + sizeof(*(inarg))) +#define OFFSET_MAX 0x7fffffffffffffffLL + +struct fuse_ll; + +struct fuse_req { + struct fuse_ll *f; + uint64_t unique; + int ctr; + pthread_mutex_t lock; + struct fuse_ctx ctx; + struct fuse_chan *ch; + int interrupted; + union { + struct { + uint64_t unique; + } i; + struct { + fuse_interrupt_func_t func; + void *data; + } ni; + } u; + struct fuse_req *next; + struct fuse_req *prev; +}; + +struct fuse_ll { + int debug; + int allow_root; + struct fuse_lowlevel_ops op; + int got_init; + void *userdata; + uid_t owner; + struct fuse_conn_info conn; + struct fuse_req list; + struct fuse_req interrupts; + pthread_mutex_t lock; + int got_destroy; +}; + +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->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); +#ifdef POSIXACLS + attr->filling = 0; /* JPA trying to be safe */ +#endif +} + +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; + ST_ATIM_NSEC_SET(stbuf, attr->atimensec); + ST_MTIM_NSEC_SET(stbuf, attr->mtimensec); +} + +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); +} + +static void free_req(fuse_req_t req) +{ + int ctr; + struct fuse_ll *f = req->f; + + pthread_mutex_lock(&req->lock); + req->u.ni.func = NULL; + req->u.ni.data = NULL; + pthread_mutex_unlock(&req->lock); + + pthread_mutex_lock(&f->lock); + list_del_req(req); + ctr = --req->ctr; + pthread_mutex_unlock(&f->lock); + if (!ctr) + destroy_req(req); +} + +static int send_reply_iov(fuse_req_t req, int error, struct iovec *iov, + int count) +{ + struct fuse_out_header out; + int res; + + 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); + out.len = iov_length(iov, count); + + if (req->f->debug) + fprintf(stderr, " unique: %llu, error: %i (%s), outsize: %i\n", + (unsigned long long) out.unique, out.error, + strerror(-out.error), out.len); + res = fuse_chan_send(req->ch, iov, count); + 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; +} + +size_t fuse_dirent_size(size_t namelen) +{ + return FUSE_DIRENT_ALIGN(FUSE_NAME_OFFSET + namelen); +} + +char *fuse_add_dirent(char *buf, const char *name, const struct stat *stbuf, + off_t off) +{ + unsigned namelen = strlen(name); + unsigned entlen = FUSE_NAME_OFFSET + namelen; + unsigned entsize = fuse_dirent_size(namelen); + unsigned padlen = entsize - entlen; + struct fuse_dirent *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); + if (padlen) + memset(buf + entlen, 0, padlen); + + return buf + entsize; +} + +size_t fuse_add_direntry(fuse_req_t req, char *buf, size_t bufsize, + const char *name, const struct stat *stbuf, off_t off) +{ + size_t entsize; + + (void) req; + entsize = fuse_dirent_size(strlen(name)); + if (entsize <= bufsize && buf) + fuse_add_dirent(buf, name, stbuf, off); + return entsize; +} + +#if HAVE_SYS_STATVFS_H + +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; +} +#endif + + +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_chan_send(req->ch, NULL, 0); + 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) +{ + unsigned long secs = calc_timeout_sec(t); + double f = t - (double)secs; + 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); +} + +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; +} + +int fuse_reply_entry(fuse_req_t req, const struct fuse_entry_param *e) +{ + struct fuse_entry_out 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); + + memset(&arg, 0, sizeof(arg)); + fill_entry(&arg, e); +#ifdef POSIXACLS + return send_reply_ok(req, &arg, (req->f->conn.proto_minor >= 12 + ? sizeof(arg) : FUSE_COMPAT_ENTRY_OUT_SIZE)); +#else + return send_reply_ok(req, &arg, sizeof(arg)); +#endif +} + +int fuse_reply_create(fuse_req_t req, const struct fuse_entry_param *e, + const struct fuse_file_info *f) +{ + struct { + struct fuse_entry_out e; + struct fuse_open_out o; + } arg; + + memset(&arg, 0, sizeof(arg)); + fill_entry(&arg.e, e); +#ifdef POSIXACLS + if (req->f->conn.proto_minor < 12) { + fill_open((struct fuse_open_out*) + ((char*)&arg + FUSE_COMPAT_ENTRY_OUT_SIZE), f); + return send_reply_ok(req, &arg, + FUSE_COMPAT_ENTRY_OUT_SIZE + sizeof(struct fuse_open_out)); + } else { + fill_open(&arg.o, f); + return send_reply_ok(req, &arg, sizeof(arg)); + } +#else + fill_open(&arg.o, f); + return send_reply_ok(req, &arg, sizeof(arg)); +#endif +} + +int fuse_reply_attr(fuse_req_t req, const struct stat *attr, + double attr_timeout) +{ + struct fuse_attr_out 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); + +#ifdef POSIXACLS + return send_reply_ok(req, &arg, (req->f->conn.proto_minor >= 12 + ? sizeof(arg) : FUSE_COMPAT_FUSE_ATTR_OUT_SIZE)); +#else + return send_reply_ok(req, &arg, sizeof(arg)); +#endif +} + +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); +} + +#if HAVE_SYS_STATVFS_H + +int fuse_reply_statfs(fuse_req_t req, const struct statvfs *stbuf) +{ + struct fuse_statfs_out arg; + size_t size = req->f->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); +} +#endif + + +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, 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 void do_lookup(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) +{ + const char *name = (const char *) inarg; + + if (req->f->op.lookup) + req->f->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) +{ + const struct fuse_forget_in *arg = (const struct fuse_forget_in *) inarg; + + if (req->f->op.forget) + req->f->op.forget(req, nodeid, arg->nlookup); + else + fuse_reply_none(req); +} + +static void do_getattr(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) +{ + (void) inarg; + + if (req->f->op.getattr) + req->f->op.getattr(req, nodeid, NULL); + else + fuse_reply_err(req, ENOSYS); +} + +static void do_setattr(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) +{ + const struct fuse_setattr_in *arg = (const struct fuse_setattr_in *) inarg; + + if (req->f->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) { + memset(&fi_store, 0, sizeof(fi_store)); + fi = &fi_store; + fi->fh = arg->fh; + fi->fh_old = fi->fh; + } + req->f->op.setattr(req, nodeid, &stbuf, arg->valid & ~FATTR_FH, fi); + } else + fuse_reply_err(req, ENOSYS); +} + +static void do_access(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) +{ + const struct fuse_access_in *arg = (const struct fuse_access_in *) inarg; + + if (req->f->op.access) + req->f->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->f->op.readlink) + req->f->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) +{ + const struct fuse_mknod_in *arg = (const struct fuse_mknod_in *) inarg; + const char *name = PARAM(arg); + +#ifdef POSIXACLS + if (req->f->conn.proto_minor >= 12) + req->ctx.umask = arg->umask; + else +#endif + name = (const char *) inarg + FUSE_COMPAT_MKNOD_IN_SIZE; + + if (req->f->op.mknod) + req->f->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) +{ + const struct fuse_mkdir_in *arg = (const struct fuse_mkdir_in *) inarg; + +#ifdef POSIXACLS + if (req->f->conn.proto_minor >= 12) + req->ctx.umask = arg->umask; +#endif + + if (req->f->op.mkdir) + req->f->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) +{ + const char *name = (const char *) inarg; + + if (req->f->op.unlink) + req->f->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) +{ + const char *name = (const char *) inarg; + + if (req->f->op.rmdir) + req->f->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) +{ + const char *name = (const char *) inarg; + const char *linkname = ((const char *) inarg) + strlen((const char *) inarg) + 1; + + if (req->f->op.symlink) + req->f->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) +{ + const struct fuse_rename_in *arg = (const struct fuse_rename_in *) inarg; + const char *oldname = PARAM(arg); + const char *newname = oldname + strlen(oldname) + 1; + + if (req->f->op.rename) + req->f->op.rename(req, nodeid, oldname, arg->newdir, newname); + else + fuse_reply_err(req, ENOSYS); +} + +static void do_link(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) +{ + const struct fuse_link_in *arg = (const struct fuse_link_in *) inarg; + + if (req->f->op.link) + req->f->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) +{ + const struct fuse_create_in *arg = (const struct fuse_create_in *) inarg; + + if (req->f->op.create) { + struct fuse_file_info fi; + const char *name = PARAM(arg); + + memset(&fi, 0, sizeof(fi)); + fi.flags = arg->flags; + +#ifdef POSIXACLS + if (req->f->conn.proto_minor >= 12) + req->ctx.umask = arg->umask; + else +#endif + name = (const char *) inarg + sizeof(struct fuse_open_in); + + req->f->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) +{ + const struct fuse_open_in *arg = (const struct fuse_open_in *) inarg; + struct fuse_file_info fi; + + memset(&fi, 0, sizeof(fi)); + fi.flags = arg->flags; + + if (req->f->op.open) + req->f->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) +{ + const struct fuse_read_in *arg = (const struct fuse_read_in *) inarg; + + if (req->f->op.read) { + struct fuse_file_info fi; + + memset(&fi, 0, sizeof(fi)); + fi.fh = arg->fh; + fi.fh_old = fi.fh; + req->f->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) +{ + const struct fuse_write_in *arg = (const struct fuse_write_in *) inarg; + struct fuse_file_info fi; + + memset(&fi, 0, sizeof(fi)); + fi.fh = arg->fh; + fi.fh_old = fi.fh; + fi.writepage = arg->write_flags & 1; + + if (req->f->op.write) { +#ifdef POSIXACLS + const char *buf; + + if (req->f->conn.proto_minor >= 12) + buf = PARAM(arg); + else + buf = ((const char*)arg) + FUSE_COMPAT_WRITE_IN_SIZE; + req->f->op.write(req, nodeid, buf, arg->size, arg->offset, &fi); +#else + req->f->op.write(req, nodeid, PARAM(arg), arg->size, arg->offset, &fi); +#endif + } else + fuse_reply_err(req, ENOSYS); +} + +static void do_flush(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) +{ + const struct fuse_flush_in *arg = (const struct fuse_flush_in *) inarg; + struct fuse_file_info fi; + + memset(&fi, 0, sizeof(fi)); + fi.fh = arg->fh; + fi.fh_old = fi.fh; + fi.flush = 1; + if (req->f->conn.proto_minor >= 7) + fi.lock_owner = arg->lock_owner; + + if (req->f->op.flush) + req->f->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) +{ + const struct fuse_release_in *arg = (const struct fuse_release_in *) inarg; + struct fuse_file_info fi; + + memset(&fi, 0, sizeof(fi)); + fi.flags = arg->flags; + fi.fh = arg->fh; + fi.fh_old = fi.fh; + if (req->f->conn.proto_minor >= 8) { + fi.flush = (arg->release_flags & FUSE_RELEASE_FLUSH) ? 1 : 0; + fi.lock_owner = arg->lock_owner; + } + + if (req->f->op.release) + req->f->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) +{ + const struct fuse_fsync_in *arg = (const struct fuse_fsync_in *) inarg; + struct fuse_file_info fi; + + memset(&fi, 0, sizeof(fi)); + fi.fh = arg->fh; + fi.fh_old = fi.fh; + + if (req->f->op.fsync) + req->f->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) +{ + const struct fuse_open_in *arg = (const struct fuse_open_in *) inarg; + struct fuse_file_info fi; + + memset(&fi, 0, sizeof(fi)); + fi.flags = arg->flags; + + if (req->f->op.opendir) + req->f->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) +{ + const struct fuse_read_in *arg = (const struct fuse_read_in *) inarg; + struct fuse_file_info fi; + + memset(&fi, 0, sizeof(fi)); + fi.fh = arg->fh; + fi.fh_old = fi.fh; + + if (req->f->op.readdir) + req->f->op.readdir(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) +{ + const struct fuse_release_in *arg = (const struct fuse_release_in *) inarg; + struct fuse_file_info fi; + + memset(&fi, 0, sizeof(fi)); + fi.flags = arg->flags; + fi.fh = arg->fh; + fi.fh_old = fi.fh; + + if (req->f->op.releasedir) + req->f->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) +{ + const struct fuse_fsync_in *arg = (const struct fuse_fsync_in *) inarg; + struct fuse_file_info fi; + + memset(&fi, 0, sizeof(fi)); + fi.fh = arg->fh; + fi.fh_old = fi.fh; + + if (req->f->op.fsyncdir) + req->f->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->f->op.statfs) + req->f->op.statfs(req, nodeid); + else { +#if HAVE_SYS_STATVFS_H + struct statvfs buf = { + .f_namemax = 255, + .f_bsize = 512, + }; + fuse_reply_statfs(req, &buf); +#endif + } +} + +static void do_setxattr(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) +{ + const struct fuse_setxattr_in *arg = (const struct fuse_setxattr_in *) inarg; + const char *name = PARAM(arg); + const char *value = name + strlen(name) + 1; + + if (req->f->op.setxattr) + req->f->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) +{ + const struct fuse_getxattr_in *arg = (const struct fuse_getxattr_in *) inarg; + + if (req->f->op.getxattr) + req->f->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) +{ + const struct fuse_getxattr_in *arg = (const struct fuse_getxattr_in *) inarg; + + if (req->f->op.listxattr) + req->f->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) +{ + const char *name = (const char *) inarg; + + if (req->f->op.removexattr) + req->f->op.removexattr(req, nodeid, name); + else + fuse_reply_err(req, ENOSYS); +} + +static void convert_fuse_file_lock(const 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) +{ + const struct fuse_lk_in *arg = (const 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->f->op.getlk) + req->f->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 should_sleep) +{ + const struct fuse_lk_in *arg = (const 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->f->op.setlk) + req->f->op.setlk(req, nodeid, &fi, &flock, should_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_ll *f, struct fuse_req *req) +{ + struct fuse_req *curr; + + for (curr = f->list.next; curr != &f->list; curr = curr->next) { + if (curr->unique == req->u.i.unique) { + curr->ctr++; + pthread_mutex_unlock(&f->lock); + + /* Ugh, ugly locking */ + pthread_mutex_lock(&curr->lock); + pthread_mutex_lock(&f->lock); + curr->interrupted = 1; + pthread_mutex_unlock(&f->lock); + if (curr->u.ni.func) + curr->u.ni.func(curr, curr->u.ni.data); + pthread_mutex_unlock(&curr->lock); + + pthread_mutex_lock(&f->lock); + curr->ctr--; + if (!curr->ctr) + destroy_req(curr); + + return 1; + } + } + for (curr = f->interrupts.next; curr != &f->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) +{ + const struct fuse_interrupt_in *arg = (const struct fuse_interrupt_in *) inarg; + struct fuse_ll *f = req->f; + + (void) nodeid; + if (f->debug) + fprintf(stderr, "INTERRUPT: %llu\n", (unsigned long long) arg->unique); + + req->u.i.unique = arg->unique; + + pthread_mutex_lock(&f->lock); + if (find_interrupted(f, req)) + destroy_req(req); + else + list_add_req(req, &f->interrupts); + pthread_mutex_unlock(&f->lock); +} + +static struct fuse_req *check_interrupt(struct fuse_ll *f, struct fuse_req *req) +{ + struct fuse_req *curr; + + for (curr = f->interrupts.next; curr != &f->interrupts; curr = curr->next) { + if (curr->u.i.unique == req->unique) { + req->interrupted = 1; + list_del_req(curr); + free(curr); + return NULL; + } + } + curr = f->interrupts.next; + if (curr != &f->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) +{ + const struct fuse_bmap_in *arg = (const struct fuse_bmap_in *) inarg; + + if (req->f->op.bmap) + req->f->op.bmap(req, nodeid, arg->blocksize, arg->block); + else + fuse_reply_err(req, ENOSYS); +} + +static void do_init(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) +{ + const struct fuse_init_in *arg = (const struct fuse_init_in *) inarg; + struct fuse_init_out outarg; + struct fuse_ll *f = req->f; + size_t bufsize = fuse_chan_bufsize(req->ch); + + (void) nodeid; + if (f->debug) { + fprintf(stderr, "INIT: %u.%u\n", arg->major, arg->minor); + if (arg->major > 7 || (arg->major == 7 && arg->minor >= 6)) { + fprintf(stderr, "flags=0x%08x\n", arg->flags); + fprintf(stderr, "max_readahead=0x%08x\n", arg->max_readahead); + } + } + f->conn.proto_major = arg->major; + f->conn.proto_minor = arg->minor; + + 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 || (arg->major == 7 && arg->minor >= 6)) { + if (f->conn.async_read) + f->conn.async_read = arg->flags & FUSE_ASYNC_READ; + if (arg->max_readahead < f->conn.max_readahead) + f->conn.max_readahead = arg->max_readahead; +#ifdef POSIXACLS + if (arg->flags & FUSE_DONT_MASK) + f->conn.capable |= FUSE_CAP_DONT_MASK; +#endif + } else { + f->conn.async_read = 0; + f->conn.max_readahead = 0; + } + + 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 < f->conn.max_write) + f->conn.max_write = bufsize; + + f->got_init = 1; + if (f->op.init) + f->op.init(f->userdata, &f->conn); + + memset(&outarg, 0, sizeof(outarg)); + outarg.major = FUSE_KERNEL_VERSION; + /* + * if POSIXACLS is not set, protocol 7.8 provides a good + * compatibility with older kernel modules. + * if POSIXACLS is set, we try to use protocol 7.12 supposed + * to have the ability to process the umask conditionnally, + * but, when using an older kernel module, we fallback to 7.8 + */ +#ifdef POSIXACLS + if (arg->major > 7 || (arg->major == 7 && arg->minor >= 12)) + outarg.minor = FUSE_KERNEL_MINOR_VERSION; + else + outarg.minor = FUSE_KERNEL_MINOR_FALLBACK; +#else + outarg.minor = FUSE_KERNEL_MINOR_VERSION; +#endif + if (f->conn.async_read) + outarg.flags |= FUSE_ASYNC_READ; + if (f->op.getlk && f->op.setlk) + outarg.flags |= FUSE_POSIX_LOCKS; +#ifdef POSIXACLS + if (f->conn.want & FUSE_CAP_DONT_MASK) + outarg.flags |= FUSE_DONT_MASK; +#endif + outarg.flags |= FUSE_BIG_WRITES ; + outarg.max_readahead = f->conn.max_readahead; + outarg.max_write = f->conn.max_write; + + if (f->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); + } + + send_reply_ok(req, &outarg, arg->minor < 5 ? 8 : sizeof(outarg)); +} + +static void do_destroy(fuse_req_t req, fuse_ino_t nodeid, const void *inarg) +{ + struct fuse_ll *f = req->f; + + (void) nodeid; + (void) inarg; + + f->got_destroy = 1; + if (f->op.destroy) + f->op.destroy(f->userdata); + + send_reply_ok(req, NULL, 0); +} + +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; +} + +/* + * The size of fuse_ctx got extended, so need to be careful about + * incompatibility (i.e. a new binary cannot work with an old + * library). + */ +const struct fuse_ctx *fuse_req_ctx_compat24(fuse_req_t req); +const struct fuse_ctx *fuse_req_ctx_compat24(fuse_req_t req) +{ + return fuse_req_ctx(req); +} +//FUSE_SYMVER(".symver fuse_req_ctx_compat24,fuse_req_ctx@FUSE_2.4"); + +void fuse_req_interrupt_func(fuse_req_t req, fuse_interrupt_func_t func, + void *data) +{ + pthread_mutex_lock(&req->lock); + req->u.ni.func = func; + req->u.ni.data = data; + 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->f->lock); + interrupted = req->interrupted; + pthread_mutex_unlock(&req->f->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_DESTROY] = { do_destroy, "DESTROY" }, +}; + +#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 void fuse_ll_process(void *data, const char *buf, size_t len, + struct fuse_chan *ch) +{ + struct fuse_ll *f = (struct fuse_ll *) data; + const struct fuse_in_header *in = (const struct fuse_in_header *) buf; + const void *inarg = buf + sizeof(struct fuse_in_header); + struct fuse_req *req; + + if (f->debug) + fprintf(stderr, "unique: %llu, opcode: %s (%i), nodeid: %lu, insize: %zu\n", + (unsigned long long) in->unique, + opname((enum fuse_opcode) in->opcode), in->opcode, + (unsigned long) in->nodeid, len); + + req = (struct fuse_req *) calloc(1, sizeof(struct fuse_req)); + if (req == NULL) { + fprintf(stderr, "fuse: failed to allocate request\n"); + return; + } + + req->f = f; + req->unique = in->unique; + req->ctx.uid = in->uid; + req->ctx.gid = in->gid; + req->ctx.pid = in->pid; + req->ch = ch; + req->ctr = 1; + list_init_req(req); + fuse_mutex_init(&req->lock); + + if (!f->got_init && in->opcode != FUSE_INIT) + fuse_reply_err(req, EIO); + else if (f->allow_root && in->uid != f->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) { + fuse_reply_err(req, EACCES); + } else if (in->opcode >= FUSE_MAXOP || !fuse_ll_ops[in->opcode].func) + fuse_reply_err(req, ENOSYS); + else { + if (in->opcode != FUSE_INTERRUPT) { + struct fuse_req *intr; + pthread_mutex_lock(&f->lock); + intr = check_interrupt(f, req); + list_add_req(req, &f->list); + pthread_mutex_unlock(&f->lock); + if (intr) + fuse_reply_err(intr, EAGAIN); + } + fuse_ll_ops[in->opcode].func(req, in->nodeid, inarg); + } +} + +enum { + KEY_HELP, + KEY_VERSION, +}; + +static struct fuse_opt fuse_ll_opts[] = { + { "debug", offsetof(struct fuse_ll, debug), 1 }, + { "-d", offsetof(struct fuse_ll, debug), 1 }, + { "allow_root", offsetof(struct fuse_ll, allow_root), 1 }, + { "max_write=%u", offsetof(struct fuse_ll, conn.max_write), 0 }, + { "max_readahead=%u", offsetof(struct fuse_ll, conn.max_readahead), 0 }, + { "async_read", offsetof(struct fuse_ll, conn.async_read), 1 }, + { "sync_read", offsetof(struct fuse_ll, conn.async_read), 0 }, + 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_write=N set maximum size of write requests\n" +" -o max_readahead=N set maximum readahead\n" +" -o async_read perform reads asynchronously (default)\n" +" -o sync_read perform reads synchronously\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; +} + +static void fuse_ll_destroy(void *data) +{ + struct fuse_ll *f = (struct fuse_ll *) data; + + if (f->got_init && !f->got_destroy) { + if (f->op.destroy) + f->op.destroy(f->userdata); + } + + pthread_mutex_destroy(&f->lock); + free(f); +} + +struct fuse_session *fuse_lowlevel_new(struct fuse_args *args, + const struct fuse_lowlevel_ops *op, + size_t op_size, void *userdata) +{ + struct fuse_ll *f; + struct fuse_session *se; + struct fuse_session_ops sop = { + .process = fuse_ll_process, + .destroy = fuse_ll_destroy, + }; + + 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.async_read = 1; + f->conn.max_write = UINT_MAX; + f->conn.max_readahead = UINT_MAX; + list_init_req(&f->list); + list_init_req(&f->interrupts); + fuse_mutex_init(&f->lock); + + if (fuse_opt_parse(args, f, fuse_ll_opts, fuse_ll_opt_proc) == -1) + goto out_free; + + memcpy(&f->op, op, op_size); + f->owner = getuid(); + f->userdata = userdata; + + se = fuse_session_new(&sop, f); + if (!se) + goto out_free; + + return se; + + out_free: + free(f); + out: + return NULL; +} + |