2 files changed, 69 insertions, 34 deletions

diff --git a/fs/fuse/dir.c b/fs/fuse/dir.c
index 334e0b18a014..8964cf3999b2 100644
--- a/fs/fuse/dir.c
+++ b/fs/fuse/dir.c
@@ -154,7 +154,7 @@ u64 fuse_get_attr_version(struct fuse_conn *fc)
  * the lookup once more.  If the lookup results in the same inode,
  * then refresh the attributes, timeouts and mark the dentry valid.
  */
-static int fuse_dentry_revalidate(struct dentry *entry, struct nameidata *nd)
+static int fuse_dentry_revalidate(struct dentry *entry, unsigned int flags)
 {
         struct inode *inode;
 
@@ -174,7 +174,7 @@ static int fuse_dentry_revalidate(struct dentry *entry, struct nameidata *nd)
                 if (!inode)
                         return 0;
 
-                if (nd && (nd->flags & LOOKUP_RCU))
+                if (flags & LOOKUP_RCU)
                         return -ECHILD;
 
                 fc = get_fuse_conn(inode);
@@ -249,7 +249,7 @@ static struct dentry *fuse_d_add_directory(struct dentry *entry,
                 /* This tries to shrink the subtree below alias */
                 fuse_invalidate_entry(alias);
                 dput(alias);
-                if (!list_empty(&inode->i_dentry))
+                if (!hlist_empty(&inode->i_dentry))
                         return ERR_PTR(-EBUSY);
         } else {
                 dput(alias);
@@ -316,7 +316,7 @@ int fuse_lookup_name(struct super_block *sb, u64 nodeid, struct qstr *name,
 }
 
 static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
-                                  struct nameidata *nd)
+                                  unsigned int flags)
 {
         int err;
         struct fuse_entry_out outarg;
@@ -370,7 +370,8 @@ static struct dentry *fuse_lookup(struct inode *dir, struct dentry *entry,
  * 'mknod' + 'open' requests.
  */
 static int fuse_create_open(struct inode *dir, struct dentry *entry,
-                            umode_t mode, struct nameidata *nd)
+                            struct file *file, unsigned flags,
+                            umode_t mode, int *opened)
 {
         int err;
         struct inode *inode;
@@ -381,15 +382,11 @@ static int fuse_create_open(struct inode *dir, struct dentry *entry,
         struct fuse_open_out outopen;
         struct fuse_entry_out outentry;
         struct fuse_file *ff;
-        struct file *file;
-        int flags = nd->intent.open.flags;
-
-        if (fc->no_create)
-                return -ENOSYS;
 
         forget = fuse_alloc_forget();
+        err = -ENOMEM;
         if (!forget)
-                return -ENOMEM;
+                goto out_err;
 
         req = fuse_get_req(fc);
         err = PTR_ERR(req);
@@ -428,11 +425,8 @@ static int fuse_create_open(struct inode *dir, struct dentry *entry,
         req->out.args[1].value = &outopen;
         fuse_request_send(fc, req);
         err = req->out.h.error;
-        if (err) {
-                if (err == -ENOSYS)
-                        fc->no_create = 1;
+        if (err)
                 goto out_free_ff;
-        }
 
         err = -EIO;
         if (!S_ISREG(outentry.attr.mode) || invalid_nodeid(outentry.nodeid))
@@ -448,28 +442,74 @@ static int fuse_create_open(struct inode *dir, struct dentry *entry,
                 flags &= ~(O_CREAT | O_EXCL | O_TRUNC);
                 fuse_sync_release(ff, flags);
                 fuse_queue_forget(fc, forget, outentry.nodeid, 1);
-                return -ENOMEM;
+                err = -ENOMEM;
+                goto out_err;
         }
         kfree(forget);
         d_instantiate(entry, inode);
         fuse_change_entry_timeout(entry, &outentry);
         fuse_invalidate_attr(dir);
-        file = lookup_instantiate_filp(nd, entry, generic_file_open);
-        if (IS_ERR(file)) {
+        err = finish_open(file, entry, generic_file_open, opened);
+        if (err) {
                 fuse_sync_release(ff, flags);
-                return PTR_ERR(file);
+        } else {
+                file->private_data = fuse_file_get(ff);
+                fuse_finish_open(inode, file);
         }
-        file->private_data = fuse_file_get(ff);
-        fuse_finish_open(inode, file);
-        return 0;
+        return err;
 
- out_free_ff:
+out_free_ff:
         fuse_file_free(ff);
- out_put_request:
+out_put_request:
         fuse_put_request(fc, req);
- out_put_forget_req:
+out_put_forget_req:
         kfree(forget);
+out_err:
+        return err;
+}
+
+static int fuse_mknod(struct inode *, struct dentry *, umode_t, dev_t);
+static int fuse_atomic_open(struct inode *dir, struct dentry *entry,
+                            struct file *file, unsigned flags,
+                            umode_t mode, int *opened)
+{
+        int err;
+        struct fuse_conn *fc = get_fuse_conn(dir);
+        struct dentry *res = NULL;
+
+        if (d_unhashed(entry)) {
+                res = fuse_lookup(dir, entry, 0);
+                if (IS_ERR(res))
+                        return PTR_ERR(res);
+
+                if (res)
+                        entry = res;
+        }
+
+        if (!(flags & O_CREAT) || entry->d_inode)
+                goto no_open;
+
+        /* Only creates */
+        *opened |= FILE_CREATED;
+
+        if (fc->no_create)
+                goto mknod;
+
+        err = fuse_create_open(dir, entry, file, flags, mode, opened);
+        if (err == -ENOSYS) {
+                fc->no_create = 1;
+                goto mknod;
+        }
+out_dput:
+        dput(res);
         return err;
+
+mknod:
+        err = fuse_mknod(dir, entry, mode, 0);
+        if (err)
+                goto out_dput;
+no_open:
+        return finish_no_open(file, res);
 }
 
 /*
@@ -571,14 +611,8 @@ static int fuse_mknod(struct inode *dir, struct dentry *entry, umode_t mode,
 }
 
 static int fuse_create(struct inode *dir, struct dentry *entry, umode_t mode,
-                       struct nameidata *nd)
+                       bool excl)
 {
-        if (nd) {
-                int err = fuse_create_open(dir, entry, mode, nd);
-                if (err != -ENOSYS)
-                        return err;
-                /* Fall back on mknod */
-        }
         return fuse_mknod(dir, entry, mode, 0);
 }
 
@@ -1646,6 +1680,7 @@ static const struct inode_operations fuse_dir_inode_operations = {
         .link           = fuse_link,
         .setattr        = fuse_setattr,
         .create         = fuse_create,
+        .atomic_open    = fuse_atomic_open,
         .mknod          = fuse_mknod,
         .permission     = fuse_permission,
         .getattr        = fuse_getattr,
diff --git a/fs/fuse/file.c b/fs/fuse/file.c
index 2eed3acfb6a6..aba15f1b7ad2 100644
--- a/fs/fuse/file.c
+++ b/fs/fuse/file.c
@@ -947,9 +947,8 @@ static ssize_t fuse_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
                 return err;
 
         count = ocount;
-
+        sb_start_write(inode->i_sb);
         mutex_lock(&inode->i_mutex);
-        vfs_check_frozen(inode->i_sb, SB_FREEZE_WRITE);
 
         /* We can write back this queue in page reclaim */
         current->backing_dev_info = mapping->backing_dev_info;
@@ -1007,6 +1006,7 @@ static ssize_t fuse_file_aio_write(struct kiocb *iocb, const struct iovec *iov,
 out:
         current->backing_dev_info = NULL;
         mutex_unlock(&inode->i_mutex);
+        sb_end_write(inode->i_sb);
 
         return written ? written : err;
 }