From: "Dr. David Alan Gilbert" <dgilbert@redhat.com>

Date: Mon, 27 Jan 2020 19:00:51 +0000

Subject: [PATCH] virtiofsd: Trim out compatibility code

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virtiofsd only supports major=7, minor>=31; trim out a lot of

old compatibility code.

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

Reviewed-by: Daniel P. Berrangé <berrange@redhat.com>

Signed-off-by: Dr. David Alan Gilbert <dgilbert@redhat.com>

(cherry picked from commit 72c42e2d65510e073cf78fdc924d121c77fa0080)

---

 tools/virtiofsd/fuse_lowlevel.c | 330 ++++++++++++--------------------

 1 file changed, 119 insertions(+), 211 deletions(-)

diff --git a/tools/virtiofsd/fuse_lowlevel.c b/tools/virtiofsd/fuse_lowlevel.c

index 07fb8a6095..514d79cb24 100644

--- a/tools/virtiofsd/fuse_lowlevel.c

+++ b/tools/virtiofsd/fuse_lowlevel.c

@@ -387,16 +387,7 @@ static void fill_open(struct fuse_open_out *arg, const struct fuse_file_info *f)

 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);

-    }

+    size_t size = sizeof(arg);

     memset(&arg, 0, sizeof(arg));

     fill_entry(&arg, e);

@@ -407,9 +398,7 @@ 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);

+    size_t entrysize = 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);

@@ -423,8 +412,7 @@ 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);

+    size_t size = sizeof(arg);

     memset(&arg, 0, sizeof(arg));

     arg.attr_valid = calc_timeout_sec(attr_timeout);

@@ -519,8 +507,7 @@ int fuse_reply_data(fuse_req_t req, struct fuse_bufvec *bufv)

 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);

+    size_t size = sizeof(arg);

     memset(&arg, 0, sizeof(arg));

     convert_statfs(stbuf, &arg.st);

@@ -604,45 +591,31 @@ int fuse_reply_ioctl_retry(fuse_req_t req, const struct iovec *in_iov,

     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++;

-        }

+    /* 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 (out_count) {

-            iov[count].iov_base = (void *)out_iov;

-            iov[count].iov_len = sizeof(out_iov[0]) * out_count;

-            count++;

+    if (in_count) {

+        in_fiov = fuse_ioctl_iovec_copy(in_iov, in_count);

+        if (!in_fiov) {

+            goto enomem;

         }

-    } 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++;

+        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;

         }

-        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++;

-        }

+        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);

@@ -784,14 +757,12 @@ 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;

+    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 (arg->getattr_flags & FUSE_GETATTR_FH) {

+        memset(&fi, 0, sizeof(fi));

+        fi.fh = arg->fh;

+        fip = &fi;

     }

     if (req->se->op.getattr) {

@@ -856,11 +827,7 @@ 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;

-    }

+    req->ctx.umask = arg->umask;

     if (req->se->op.mknod) {

         req->se->op.mknod(req, nodeid, name, arg->mode, arg->rdev);

@@ -873,9 +840,7 @@ 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;

-    }

+    req->ctx.umask = arg->umask;

     if (req->se->op.mkdir) {

         req->se->op.mkdir(req, nodeid, PARAM(arg), arg->mode);

@@ -967,11 +932,7 @@ static void do_create(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)

         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->ctx.umask = arg->umask;

         req->se->op.create(req, nodeid, name, arg->mode, &fi);

     } else {

@@ -1003,10 +964,8 @@ static void do_read(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)

         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;

-        }

+        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);

@@ -1023,13 +982,9 @@ static void do_write(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)

     fi.fh = arg->fh;

     fi.writepage = (arg->write_flags & FUSE_WRITE_CACHE) != 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);

-    }

+    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);

@@ -1053,21 +1008,14 @@ static void do_write_buf(fuse_req_t req, fuse_ino_t nodeid, const void *inarg,

     fi.fh = arg->fh;

     fi.writepage = arg->write_flags & FUSE_WRITE_CACHE;

-    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);

+    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) {

         fuse_log(FUSE_LOG_ERR, "fuse: do_write_buf: buffer size too small\n");

         fuse_reply_err(req, EIO);

@@ -1086,9 +1034,7 @@ static void do_flush(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)

     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;

-    }

+    fi.lock_owner = arg->lock_owner;

     if (req->se->op.flush) {

         req->se->op.flush(req, nodeid, &fi);

@@ -1105,10 +1051,8 @@ static void do_release(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)

     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;

-    }

+    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;

@@ -1477,8 +1421,7 @@ static void do_ioctl(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)

     memset(&fi, 0, sizeof(fi));

     fi.fh = arg->fh;

-    if (sizeof(void *) == 4 && req->se->conn.proto_minor >= 16 &&

-        !(flags & FUSE_IOCTL_32BIT)) {

+    if (sizeof(void *) == 4 && !(flags & FUSE_IOCTL_32BIT)) {

         req->ioctl_64bit = 1;

     }

@@ -1603,7 +1546,7 @@ static void do_init(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)

     outarg.major = FUSE_KERNEL_VERSION;

     outarg.minor = FUSE_KERNEL_MINOR_VERSION;

-    if (arg->major < 7) {

+    if (arg->major < 7 || (arg->major == 7 && arg->minor < 31)) {

         fuse_log(FUSE_LOG_ERR, "fuse: unsupported protocol version: %u.%u\n",

                  arg->major, arg->minor);

         fuse_reply_err(req, EPROTO);

@@ -1616,81 +1559,71 @@ static void do_init(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)

         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;

-        }

-        if (arg->flags & FUSE_NO_OPENDIR_SUPPORT) {

-            se->conn.capable |= FUSE_CAP_NO_OPENDIR_SUPPORT;

-        }

-        if (!(arg->flags & FUSE_MAX_PAGES)) {

-            size_t max_bufsize =

-                FUSE_DEFAULT_MAX_PAGES_PER_REQ * getpagesize() +

-                FUSE_BUFFER_HEADER_SIZE;

-            if (bufsize > max_bufsize) {

-                bufsize = max_bufsize;

-            }

+    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;

+    }

+    if (arg->flags & FUSE_NO_OPENDIR_SUPPORT) {

+        se->conn.capable |= FUSE_CAP_NO_OPENDIR_SUPPORT;

+    }

+    if (!(arg->flags & FUSE_MAX_PAGES)) {

+        size_t max_bufsize = FUSE_DEFAULT_MAX_PAGES_PER_REQ * getpagesize() +

+                             FUSE_BUFFER_HEADER_SIZE;

+        if (bufsize > max_bufsize) {

+            bufsize = max_bufsize;

         }

-    } 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;

+    se->conn.capable |= FUSE_CAP_SPLICE_WRITE | FUSE_CAP_SPLICE_MOVE;

 #endif

-        se->conn.capable |= FUSE_CAP_SPLICE_READ;

+    se->conn.capable |= FUSE_CAP_SPLICE_READ;

 #endif

-    }

-    if (se->conn.proto_minor >= 18) {

-        se->conn.capable |= FUSE_CAP_IOCTL_DIR;

-    }

+    se->conn.capable |= FUSE_CAP_IOCTL_DIR;

     /*

      * Default settings for modern filesystems.

@@ -1797,24 +1730,20 @@ static void do_init(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)

     }

     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.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.proto_minor >= 23) {

-        outarg.time_gran = se->conn.time_gran;

+    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;

+    outarg.time_gran = se->conn.time_gran;

+

     if (se->debug) {

         fuse_log(FUSE_LOG_DEBUG, "   INIT: %u.%u\n", outarg.major,

                  outarg.minor);

@@ -1828,11 +1757,6 @@ static void do_init(fuse_req_t req, fuse_ino_t nodeid, const void *inarg)

                  outarg.congestion_threshold);

         fuse_log(FUSE_LOG_DEBUG, "   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);

 }

@@ -1896,10 +1820,6 @@ int fuse_lowlevel_notify_inval_inode(struct fuse_session *se, fuse_ino_t ino,

         return -EINVAL;

     }

-    if (se->conn.proto_major < 6 || se->conn.proto_minor < 12) {

-        return -ENOSYS;

-    }

-

     outarg.ino = ino;

     outarg.off = off;

     outarg.len = len;

@@ -1920,10 +1840,6 @@ int fuse_lowlevel_notify_inval_entry(struct fuse_session *se, fuse_ino_t parent,

         return -EINVAL;

     }

-    if (se->conn.proto_major < 6 || se->conn.proto_minor < 12) {

-        return -ENOSYS;

-    }

-

     outarg.parent = parent;

     outarg.namelen = namelen;

     outarg.padding = 0;

@@ -1947,10 +1863,6 @@ int fuse_lowlevel_notify_delete(struct fuse_session *se, fuse_ino_t parent,

         return -EINVAL;

     }

-    if (se->conn.proto_major < 6 || se->conn.proto_minor < 18) {

-        return -ENOSYS;

-    }

-

     outarg.parent = parent;

     outarg.child = child;

     outarg.namelen = namelen;

@@ -1977,10 +1889,6 @@ int fuse_lowlevel_notify_store(struct fuse_session *se, fuse_ino_t ino,

         return -EINVAL;

     }

-    if (se->conn.proto_major < 6 || se->conn.proto_minor < 15) {

-        return -ENOSYS;

-    }

-

     out.unique = 0;

     out.error = FUSE_NOTIFY_STORE;