Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse

Pull fuse fixes from Miklos Szeredi:
 "This fixes a regression in the latest fuse update plus a fix for a
  rather theoretical memory ordering issue"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/mszeredi/fuse:
  fuse: add memory barrier to INIT
  fuse: fix LOOKUP vs INIT compat handling

4 files changed, 60 insertions, 29 deletions

diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index ba1107977f2e..ed19a7d622fa 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -131,6 +131,13 @@ static void fuse_req_init_context(struct fuse_req *req)
         req->in.h.pid = current->pid;
 }
 
+void fuse_set_initialized(struct fuse_conn *fc)
+{
+        /* Make sure stores before this are seen on another CPU */
+        smp_wmb();
+        fc->initialized = 1;
+}
+
 static bool fuse_block_alloc(struct fuse_conn *fc, bool for_background)
 {
         return !fc->initialized || (for_background && fc->blocked);
@@ -155,6 +162,8 @@ static struct fuse_req *__fuse_get_req(struct fuse_conn *fc, unsigned npages,
                 if (intr)
                         goto out;
         }
+        /* Matches smp_wmb() in fuse_set_initialized() */
+        smp_rmb();
 
         err = -ENOTCONN;
         if (!fc->connected)
@@ -253,6 +262,8 @@ struct fuse_req *fuse_get_req_nofail_nopages(struct fuse_conn *fc,
 
         atomic_inc(&fc->num_waiting);
         wait_event(fc->blocked_waitq, fc->initialized);
+        /* Matches smp_wmb() in fuse_set_initialized() */
+        smp_rmb();
         req = fuse_request_alloc(0);
         if (!req)
                 req = get_reserved_req(fc, file);
@@ -511,6 +522,39 @@ void fuse_request_send(struct fuse_conn *fc, struct fuse_req *req)
 }
 EXPORT_SYMBOL_GPL(fuse_request_send);
 
+static void fuse_adjust_compat(struct fuse_conn *fc, struct fuse_args *args)
+{
+        if (fc->minor < 4 && args->in.h.opcode == FUSE_STATFS)
+                args->out.args[0].size = FUSE_COMPAT_STATFS_SIZE;
+
+        if (fc->minor < 9) {
+                switch (args->in.h.opcode) {
+                case FUSE_LOOKUP:
+                case FUSE_CREATE:
+                case FUSE_MKNOD:
+                case FUSE_MKDIR:
+                case FUSE_SYMLINK:
+                case FUSE_LINK:
+                        args->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE;
+                        break;
+                case FUSE_GETATTR:
+                case FUSE_SETATTR:
+                        args->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE;
+                        break;
+                }
+        }
+        if (fc->minor < 12) {
+                switch (args->in.h.opcode) {
+                case FUSE_CREATE:
+                        args->in.args[0].size = sizeof(struct fuse_open_in);
+                        break;
+                case FUSE_MKNOD:
+                        args->in.args[0].size = FUSE_COMPAT_MKNOD_IN_SIZE;
+                        break;
+                }
+        }
+}
+
 ssize_t fuse_simple_request(struct fuse_conn *fc, struct fuse_args *args)
 {
         struct fuse_req *req;
@@ -520,6 +564,9 @@ ssize_t fuse_simple_request(struct fuse_conn *fc, struct fuse_args *args)
         if (IS_ERR(req))
                 return PTR_ERR(req);
 
+        /* Needs to be done after fuse_get_req() so that fc->minor is valid */
+        fuse_adjust_compat(fc, args);
+
         req->in.h.opcode = args->in.h.opcode;
         req->in.h.nodeid = args->in.h.nodeid;
         req->in.numargs = args->in.numargs;
@@ -2127,7 +2174,7 @@ void fuse_abort_conn(struct fuse_conn *fc)
         if (fc->connected) {
                 fc->connected = 0;
                 fc->blocked = 0;
-                fc->initialized = 1;
+                fuse_set_initialized(fc);
                 end_io_requests(fc);
                 end_queued_requests(fc);
                 end_polls(fc);
@@ -2146,7 +2193,7 @@ int fuse_dev_release(struct inode *inode, struct file *file)
                 spin_lock(&fc->lock);
                 fc->connected = 0;
                 fc->blocked = 0;
-                fc->initialized = 1;
+                fuse_set_initialized(fc);
                 end_queued_requests(fc);
                 end_polls(fc);
                 wake_up_all(&fc->blocked_waitq);
diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index 252b8a5de8b5..08e7b1a9d5d0 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -156,10 +156,7 @@ static void fuse_lookup_init(struct fuse_conn *fc, struct fuse_args *args,
         args->in.args[0].size = name->len + 1;
         args->in.args[0].value = name->name;
         args->out.numargs = 1;
-        if (fc->minor < 9)
-                args->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE;
-        else
-                args->out.args[0].size = sizeof(struct fuse_entry_out);
+        args->out.args[0].size = sizeof(struct fuse_entry_out);
         args->out.args[0].value = outarg;
 }
 
@@ -422,16 +419,12 @@ static int fuse_create_open(struct inode *dir, struct dentry *entry,
         args.in.h.opcode = FUSE_CREATE;
         args.in.h.nodeid = get_node_id(dir);
         args.in.numargs = 2;
-        args.in.args[0].size = fc->minor < 12 ? sizeof(struct fuse_open_in) :
-                                                sizeof(inarg);
+        args.in.args[0].size = sizeof(inarg);
         args.in.args[0].value = &inarg;
         args.in.args[1].size = entry->d_name.len + 1;
         args.in.args[1].value = entry->d_name.name;
         args.out.numargs = 2;
-        if (fc->minor < 9)
-                args.out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE;
-        else
-                args.out.args[0].size = sizeof(outentry);
+        args.out.args[0].size = sizeof(outentry);
         args.out.args[0].value = &outentry;
         args.out.args[1].size = sizeof(outopen);
         args.out.args[1].value = &outopen;
@@ -539,10 +532,7 @@ static int create_new_entry(struct fuse_conn *fc, struct fuse_args *args,
         memset(&outarg, 0, sizeof(outarg));
         args->in.h.nodeid = get_node_id(dir);
         args->out.numargs = 1;
-        if (fc->minor < 9)
-                args->out.args[0].size = FUSE_COMPAT_ENTRY_OUT_SIZE;
-        else
-                args->out.args[0].size = sizeof(outarg);
+        args->out.args[0].size = sizeof(outarg);
         args->out.args[0].value = &outarg;
         err = fuse_simple_request(fc, args);
         if (err)
@@ -592,8 +582,7 @@ static int fuse_mknod(struct inode *dir, struct dentry *entry, umode_t mode,
         inarg.umask = current_umask();
         args.in.h.opcode = FUSE_MKNOD;
         args.in.numargs = 2;
-        args.in.args[0].size = fc->minor < 12 ? FUSE_COMPAT_MKNOD_IN_SIZE :
-                                                sizeof(inarg);
+        args.in.args[0].size = sizeof(inarg);
         args.in.args[0].value = &inarg;
         args.in.args[1].size = entry->d_name.len + 1;
         args.in.args[1].value = entry->d_name.name;
@@ -899,10 +888,7 @@ static int fuse_do_getattr(struct inode *inode, struct kstat *stat,
         args.in.args[0].size = sizeof(inarg);
         args.in.args[0].value = &inarg;
         args.out.numargs = 1;
-        if (fc->minor < 9)
-                args.out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE;
-        else
-                args.out.args[0].size = sizeof(outarg);
+        args.out.args[0].size = sizeof(outarg);
         args.out.args[0].value = &outarg;
         err = fuse_simple_request(fc, &args);
         if (!err) {
@@ -1574,10 +1560,7 @@ static void fuse_setattr_fill(struct fuse_conn *fc, struct fuse_args *args,
         args->in.args[0].size = sizeof(*inarg_p);
         args->in.args[0].value = inarg_p;
         args->out.numargs = 1;
-        if (fc->minor < 9)
-                args->out.args[0].size = FUSE_COMPAT_ATTR_OUT_SIZE;
-        else
-                args->out.args[0].size = sizeof(*outarg_p);
+        args->out.args[0].size = sizeof(*outarg_p);
         args->out.args[0].value = outarg_p;
 }
 
diff --git a/fs/fuse/fuse_i.h b/fs/fuse/fuse_i.h
index e0fc6725d1d0..1cdfb07c1376 100644
--- a/fs/fuse/fuse_i.h
+++ b/fs/fuse/fuse_i.h
@@ -906,4 +906,6 @@ int fuse_write_inode(struct inode *inode, struct writeback_control *wbc);
 int fuse_do_setattr(struct inode *inode, struct iattr *attr,
                     struct file *file);
 
+void fuse_set_initialized(struct fuse_conn *fc);
+
 #endif /* _FS_FUSE_I_H */
diff --git a/fs/fuse/inode.c b/fs/fuse/inode.c
index 6749109f255d..f38256e4476e 100644
--- a/fs/fuse/inode.c
+++ b/fs/fuse/inode.c
@@ -424,8 +424,7 @@ static int fuse_statfs(struct dentry *dentry, struct kstatfs *buf)
         args.in.h.opcode = FUSE_STATFS;
         args.in.h.nodeid = get_node_id(dentry->d_inode);
         args.out.numargs = 1;
-        args.out.args[0].size =
-                fc->minor < 4 ? FUSE_COMPAT_STATFS_SIZE : sizeof(outarg);
+        args.out.args[0].size = sizeof(outarg);
         args.out.args[0].value = &outarg;
         err = fuse_simple_request(fc, &args);
         if (!err)
@@ -898,7 +897,7 @@ static void process_init_reply(struct fuse_conn *fc, struct fuse_req *req)
                 fc->max_write = max_t(unsigned, 4096, fc->max_write);
                 fc->conn_init = 1;
         }
-        fc->initialized = 1;
+        fuse_set_initialized(fc);
         wake_up_all(&fc->blocked_waitq);
 }