diff options
Diffstat (limited to 'fuse/fuse_lowlevel.c')
| -rw-r--r-- | fuse/fuse_lowlevel.c | 1862 |
1 files changed, 1862 insertions, 0 deletions
diff --git a/fuse/fuse_lowlevel.c b/fuse/fuse_lowlevel.c new file mode 100644 index 000000000..90f756e54 --- /dev/null +++ b/fuse/fuse_lowlevel.c @@ -0,0 +1,1862 @@ +/* + 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 "fuse_i.h" +#include "fuse_kernel.h" +#include "fuse_opt.h" +#include "fuse_misc.h" +#include "fuse_common_compat.h" +#include "fuse_lowlevel_compat.h" + +#define linux +#include <stdio.h> +#include <stdlib.h> +#include <stddef.h> +#include <string.h> +#include <unistd.h> +#include <limits.h> +#include <errno.h> + +#define PARAM(inarg) (((char *)(inarg)) + sizeof(*(inarg))) +#define OFFSET_MAX 0x7fffffffffffffffLL + +struct fuse_pollhandle { + uint64_t kh; + struct fuse_chan *ch; + struct fuse_ll *f; +}; + +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; + 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); +} + +void fuse_free_req(fuse_req_t req) +{ + int ctr; + struct fuse_ll *f = req->f; + + pthread_mutex_lock(&f->lock); + req->u.ni.func = NULL; + req->u.ni.data = NULL; + list_del_req(req); + ctr = --req->ctr; + pthread_mutex_unlock(&f->lock); + if (!ctr) + destroy_req(req); +} + +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); + out.len = iov_length(iov, count); + + if (req->f->debug) { + 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); + } + } + + return fuse_chan_send(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; +} + +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, + off64_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, off64_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; +} + +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_chan_send(req->ch, NULL, 0); + 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); +} + +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->f->conn.proto_minor < 9 ? + FUSE_COMPAT_ENTRY_OUT_SIZE : sizeof(arg); + + /* before ABI 7.4 e->ino == 0 was invalid, only ENOENT meant + negative entry */ + if (!e->ino && req->f->conn.proto_minor < 4) + return fuse_reply_err(req, ENOENT); + + 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->f->conn.proto_minor < 9 ? + FUSE_COMPAT_ENTRY_OUT_SIZE : sizeof(struct fuse_entry_out); + struct fuse_entry_out *earg = (struct fuse_entry_out *) buf; + 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->f->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); +} + +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); +} + +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)); +} + +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 iovec iov[4]; + size_t count = 1; + + 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 (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++; + } + + return send_reply_iov(req, 0, iov, count); +} + +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->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) +{ + struct fuse_forget_in *arg = (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) +{ + struct fuse_file_info *fip = NULL; + struct fuse_file_info fi; + + if (req->f->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; + fi.fh_old = fi.fh; + fip = &fi; + } + } + + if (req->f->op.getattr) + req->f->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->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) { + arg->valid &= ~FATTR_FH; + memset(&fi_store, 0, sizeof(fi_store)); + fi = &fi_store; + fi->fh = arg->fh; + fi->fh_old = fi->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; + + req->f->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->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) +{ + struct fuse_mknod_in *arg = (struct fuse_mknod_in *) inarg; + char *name = PARAM(arg); + + if (req->f->conn.proto_minor >= 12) + req->ctx.umask = arg->umask; + else + name = (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) +{ + struct fuse_mkdir_in *arg = (struct fuse_mkdir_in *) inarg; + + if (req->f->conn.proto_minor >= 12) + req->ctx.umask = arg->umask; + + 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) +{ + char *name = (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) +{ + char *name = (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) +{ + char *name = (char *) inarg; + char *linkname = ((char *) inarg) + strlen((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) +{ + struct fuse_rename_in *arg = (struct fuse_rename_in *) inarg; + char *oldname = PARAM(arg); + 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) +{ + struct fuse_link_in *arg = (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) +{ + struct fuse_create_in *arg = (struct fuse_create_in *) inarg; + + if (req->f->op.create) { + struct fuse_file_info fi; + char *name = PARAM(arg); + + memset(&fi, 0, sizeof(fi)); + fi.flags = arg->flags; + + if (req->f->conn.proto_minor >= 12) + req->ctx.umask = arg->umask; + else + name = (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) +{ + 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->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) +{ + struct fuse_read_in *arg = (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; + if (req->f->conn.proto_minor >= 9) { + fi.lock_owner = arg->lock_owner; + fi.flags = arg->flags; + } + 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) +{ + 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.fh_old = fi.fh; + fi.writepage = arg->write_flags & 1; + + if (req->f->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->f->op.write) + req->f->op.write(req, nodeid, param, arg->size, + arg->offset, &fi); + else + fuse_reply_err(req, ENOSYS); +} + +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.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) +{ + 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; + 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) +{ + struct fuse_fsync_in *arg = (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) +{ + 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->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) +{ + struct fuse_read_in *arg = (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) +{ + 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; + 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) +{ + struct fuse_fsync_in *arg = (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 { + 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->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) +{ + struct fuse_getxattr_in *arg = (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) +{ + struct fuse_getxattr_in *arg = (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) +{ + char *name = (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(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->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 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; + + convert_fuse_file_lock(&arg->lk, &flock); + if (req->f->op.setlk) + req->f->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_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) { + fuse_interrupt_func_t func; + void *data; + + curr->ctr++; + pthread_mutex_unlock(&f->lock); + + /* Ugh, ugly locking */ + pthread_mutex_lock(&curr->lock); + pthread_mutex_lock(&f->lock); + curr->interrupted = 1; + func = curr->u.ni.func; + data = curr->u.ni.data; + pthread_mutex_unlock(&f->lock); + if (func) + func(curr, 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) +{ + struct fuse_interrupt_in *arg = (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) +{ + struct fuse_bmap_in *arg = (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_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; + + memset(&fi, 0, sizeof(fi)); + fi.fh = arg->fh; + fi.fh_old = fi.fh; + + if (req->f->op.ioctl) + req->f->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.fh_old = fi.fh; + + if (req->f->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->ch = req->ch; + ph->f = req->f; + } + + req->f->op.poll(req, nodeid, &fi, ph); + } 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_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->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; + f->conn.capable = 0; + f->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 (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; + if (arg->flags & FUSE_ASYNC_READ) + f->conn.capable |= FUSE_CAP_ASYNC_READ; + if (arg->flags & FUSE_POSIX_LOCKS) + f->conn.capable |= FUSE_CAP_POSIX_LOCKS; + if (arg->flags & FUSE_ATOMIC_O_TRUNC) + f->conn.capable |= FUSE_CAP_ATOMIC_O_TRUNC; + if (arg->flags & FUSE_EXPORT_SUPPORT) + f->conn.capable |= FUSE_CAP_EXPORT_SUPPORT; + if (arg->flags & FUSE_BIG_WRITES) + f->conn.capable |= FUSE_CAP_BIG_WRITES; + if (arg->flags & FUSE_DONT_MASK) + f->conn.capable |= FUSE_CAP_DONT_MASK; + } else { + f->conn.async_read = 0; + f->conn.max_readahead = 0; + } + + if (f->atomic_o_trunc) + f->conn.want |= FUSE_CAP_ATOMIC_O_TRUNC; + if (f->op.getlk && f->op.setlk && !f->no_remote_lock) + f->conn.want |= FUSE_CAP_POSIX_LOCKS; + if (f->big_writes) + f->conn.want |= FUSE_CAP_BIG_WRITES; + + 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); + + if (f->conn.async_read || (f->conn.want & FUSE_CAP_ASYNC_READ)) + outarg.flags |= FUSE_ASYNC_READ; + if (f->conn.want & FUSE_CAP_POSIX_LOCKS) + outarg.flags |= FUSE_POSIX_LOCKS; + if (f->conn.want & FUSE_CAP_ATOMIC_O_TRUNC) + outarg.flags |= FUSE_ATOMIC_O_TRUNC; + if (f->conn.want & FUSE_CAP_EXPORT_SUPPORT) + outarg.flags |= FUSE_EXPORT_SUPPORT; + if (f->conn.want & FUSE_CAP_BIG_WRITES) + outarg.flags |= FUSE_BIG_WRITES; + if (f->conn.want & FUSE_CAP_DONT_MASK) + outarg.flags |= FUSE_DONT_MASK; + 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); +} + +static int send_notify_iov(struct fuse_ll *f, struct fuse_chan *ch, + int notify_code, struct iovec *iov, int count) +{ + struct fuse_out_header out; + + out.unique = 0; + out.error = notify_code; + iov[0].iov_base = &out; + iov[0].iov_len = sizeof(struct fuse_out_header); + out.len = iov_length(iov, count); + + if (f->debug) + fprintf(stderr, "NOTIFY: code=%d count=%d length=%u\n", + notify_code, count, out.len); + + return fuse_chan_send(ch, 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->f, ph->ch, FUSE_NOTIFY_POLL, iov, 2); + } else { + return 0; + } +} + +int fuse_lowlevel_notify_inval_inode(struct fuse_chan *ch, fuse_ino_t ino, + off64_t off, off64_t len) +{ + struct fuse_notify_inval_inode_out outarg; + struct fuse_ll *f; + struct iovec iov[2]; + + if (!ch) + return -EINVAL; + + f = (struct fuse_ll *)fuse_session_data(fuse_chan_session(ch)); + if (!f) + return -ENODEV; + + outarg.ino = ino; + outarg.off = off; + outarg.len = len; + + iov[1].iov_base = &outarg; + iov[1].iov_len = sizeof(outarg); + + return send_notify_iov(f, ch, FUSE_NOTIFY_INVAL_INODE, iov, 2); +} + +int fuse_lowlevel_notify_inval_entry(struct fuse_chan *ch, fuse_ino_t parent, + const char *name, size_t namelen) +{ + struct fuse_notify_inval_entry_out outarg; + struct fuse_ll *f; + struct iovec iov[3]; + + if (!ch) + return -EINVAL; + + f = (struct fuse_ll *)fuse_session_data(fuse_chan_session(ch)); + if (!f) + return -ENODEV; + + outarg.parent = parent; + outarg.namelen = namelen; + outarg.padding = 0; + + iov[1].iov_base = &outarg; + iov[1].iov_len = sizeof(outarg); + iov[2].iov_base = (void *)name; + iov[2].iov_len = namelen + 1; + + return send_notify_iov(f, ch, FUSE_NOTIFY_INVAL_ENTRY, iov, 3); +} + +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); + pthread_mutex_lock(&req->f->lock); + req->u.ni.func = func; + req->u.ni.data = data; + pthread_mutex_unlock(&req->f->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->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_IOCTL] = { do_ioctl, "IOCTL" }, + [FUSE_POLL] = { do_poll, "POLL" }, + [FUSE_DESTROY] = { do_destroy, "DESTROY" }, + [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 void fuse_ll_process(void *data, const char *buf, size_t len, + struct fuse_chan *ch) +{ + struct fuse_ll *f = (struct fuse_ll *) data; + struct fuse_in_header *in = (struct fuse_in_header *) buf; + const void *inarg = buf + sizeof(struct fuse_in_header); + struct fuse_req *req; + int err; + + 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); + + err = EIO; + if (!f->got_init) { + enum fuse_opcode expected; + + expected = f->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; + 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) + 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(&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); + return; + + reply_err: + fuse_reply_err(req, err); +} + +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 }, + { "atomic_o_trunc", offsetof(struct fuse_ll, atomic_o_trunc), 1}, + { "no_remote_lock", offsetof(struct fuse_ll, no_remote_lock), 1}, + { "big_writes", offsetof(struct fuse_ll, big_writes), 1}, + FUSE_OPT_KEY("max_read=", FUSE_OPT_KEY_DISCARD), + FUSE_OPT_KEY("-h", KEY_HELP), + FUSE_OPT_KEY("--help", KEY_HELP), + FUSE_OPT_KEY("-V", KEY_VERSION), + FUSE_OPT_KEY("--version", KEY_VERSION), + FUSE_OPT_END +}; + +static void fuse_ll_version(void) +{ + fprintf(stderr, "using FUSE kernel interface version %i.%i\n", + FUSE_KERNEL_VERSION, FUSE_KERNEL_MINOR_VERSION); +} + +static void fuse_ll_help(void) +{ + fprintf(stderr, +" -o max_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" +" -o atomic_o_trunc enable atomic open+truncate support\n" +" -o big_writes enable larger than 4kB writes\n" +" -o no_remote_lock disable remote file locking\n"); +} + +static int fuse_ll_opt_proc(void *data, const char *arg, int key, + struct fuse_args *outargs) +{ + (void) data; (void) outargs; + + switch (key) { + case KEY_HELP: + fuse_ll_help(); + break; + + case KEY_VERSION: + fuse_ll_version(); + break; + + default: + fprintf(stderr, "fuse: unknown option `%s'\n", arg); + } + + return -1; +} + +int fuse_lowlevel_is_lib_option(const char *opt) +{ + return fuse_opt_match(fuse_ll_opts, opt); +} + +static void fuse_ll_destroy(void *data) +{ + struct fuse_ll *f = (struct fuse_ll *) data; + + if (f->got_init && !f->got_destroy) { + if (f->op.destroy) + f->op.destroy(f->userdata); + } + + pthread_mutex_destroy(&f->lock); + free(f->cuse_data); + free(f); +} + +/* + * always call fuse_lowlevel_new_common() internally, to work around a + * misfeature in the FreeBSD runtime linker, which links the old + * version of a symbol to internal references. + */ +struct fuse_session *fuse_lowlevel_new_common(struct fuse_args *args, + const struct fuse_lowlevel_ops *op, + size_t op_size, void *userdata) +{ + 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; + f->atomic_o_trunc = 0; + 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; + + if (f->debug) + fprintf(stderr, "FUSE library version: %s\n", PACKAGE_VERSION); + + 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; +} + + +struct fuse_session *fuse_lowlevel_new(struct fuse_args *args, + const struct fuse_lowlevel_ops *op, + size_t op_size, void *userdata) +{ + return fuse_lowlevel_new_common(args, op, op_size, userdata); +} + +#ifdef linux +int fuse_req_getgroups(fuse_req_t req, int size, gid_t list[]) +{ + char *buf; + size_t bufsize = 1024; + char path[128]; + int ret; + int fd; + unsigned long pid = req->ctx.pid; + char *s; + + sprintf(path, "/proc/%lu/task/%lu/status", pid, pid); + +retry: + buf = malloc(bufsize); + if (buf == NULL) + return -ENOMEM; + + ret = -EIO; + fd = open(path, O_RDONLY); + if (fd == -1) + goto out_free; + + ret = read(fd, buf, bufsize); + close(fd); + if (ret == -1) { + ret = -EIO; + goto out_free; + } + + if (ret == bufsize) { + free(buf); + bufsize *= 4; + goto retry; + } + + ret = -EIO; + s = strstr(buf, "\nGroups:"); + if (s == NULL) + goto out_free; + + s += 8; + ret = 0; + while (1) { + char *end; + unsigned long val = strtoul(s, &end, 0); + if (end == s) + break; + + s = end; + if (ret < size) + list[ret] = val; + ret++; + } + +out_free: + free(buf); + return ret; +} +#else /* linux */ +/* + * This is currently not implemented on other than Linux... + */ +int fuse_req_getgroups(fuse_req_t req, int size, gid_t list[]) +{ + return -ENOSYS; +} +#endif + +#ifndef __FreeBSD__ + +static void fill_open_compat(struct fuse_open_out *arg, + const struct fuse_file_info_compat *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; +} + +static void convert_statfs_compat(const struct statfs *compatbuf, + struct statvfs *buf) +{ + buf->f_bsize = compatbuf->f_bsize; + buf->f_blocks = compatbuf->f_blocks; + buf->f_bfree = compatbuf->f_bfree; + buf->f_bavail = compatbuf->f_bavail; + buf->f_files = compatbuf->f_files; + buf->f_ffree = compatbuf->f_ffree; + buf->f_namemax = compatbuf->f_namelen; +} + +int fuse_reply_open_compat(fuse_req_t req, + const struct fuse_file_info_compat *f) +{ + struct fuse_open_out arg; + + memset(&arg, 0, sizeof(arg)); + fill_open_compat(&arg, f); + return send_reply_ok(req, &arg, sizeof(arg)); +} + +int fuse_reply_statfs_compat(fuse_req_t req, const struct statfs *stbuf) +{ + struct statvfs newbuf; + + memset(&newbuf, 0, sizeof(newbuf)); + convert_statfs_compat(stbuf, &newbuf); + + return fuse_reply_statfs(req, &newbuf); +} + +struct fuse_session *fuse_lowlevel_new_compat(const char *opts, + const struct fuse_lowlevel_ops_compat *op, + size_t op_size, void *userdata) +{ + struct fuse_session *se; + struct fuse_args args = FUSE_ARGS_INIT(0, NULL); + + if (opts && + (fuse_opt_add_arg(&args, "") == -1 || + fuse_opt_add_arg(&args, "-o") == -1 || + fuse_opt_add_arg(&args, opts) == -1)) { + fuse_opt_free_args(&args); + return NULL; + } + se = fuse_lowlevel_new(&args, (const struct fuse_lowlevel_ops *) op, + op_size, userdata); + fuse_opt_free_args(&args); + + return se; +} + +struct fuse_ll_compat_conf { + unsigned max_read; + int set_max_read; +}; + +static const struct fuse_opt fuse_ll_opts_compat[] = { + { "max_read=", offsetof(struct fuse_ll_compat_conf, set_max_read), 1 }, + { "max_read=%u", offsetof(struct fuse_ll_compat_conf, max_read), 0 }, + FUSE_OPT_KEY("max_read=", FUSE_OPT_KEY_KEEP), + FUSE_OPT_END +}; + +int fuse_sync_compat_args(struct fuse_args *args) +{ + struct fuse_ll_compat_conf conf; + + memset(&conf, 0, sizeof(conf)); + if (fuse_opt_parse(args, &conf, fuse_ll_opts_compat, NULL) == -1) + return -1; + + if (fuse_opt_insert_arg(args, 1, "-osync_read")) + return -1; + + if (conf.set_max_read) { + char tmpbuf[64]; + + sprintf(tmpbuf, "-omax_readahead=%u", conf.max_read); + if (fuse_opt_insert_arg(args, 1, tmpbuf) == -1) + return -1; + } + return 0; +} + +FUSE_SYMVER(".symver fuse_reply_statfs_compat,fuse_reply_statfs@FUSE_2.4"); +FUSE_SYMVER(".symver fuse_reply_open_compat,fuse_reply_open@FUSE_2.4"); +FUSE_SYMVER(".symver fuse_lowlevel_new_compat,fuse_lowlevel_new@FUSE_2.4"); + +#else /* __FreeBSD__ */ + +int fuse_sync_compat_args(struct fuse_args *args) +{ + (void) args; + return 0; +} + +#endif /* __FreeBSD__ */ + +struct fuse_session *fuse_lowlevel_new_compat25(struct fuse_args *args, + const struct fuse_lowlevel_ops_compat25 *op, + size_t op_size, void *userdata) +{ + if (fuse_sync_compat_args(args) == -1) + return NULL; + + return fuse_lowlevel_new_common(args, + (const struct fuse_lowlevel_ops *) op, + op_size, userdata); +} + +FUSE_SYMVER(".symver fuse_lowlevel_new_compat25,fuse_lowlevel_new@FUSE_2.5"); |