Merge branch 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fs

Pull v9fs updates from Eric Van Hensbergen:
 "Just fixes and simplifications"

* 'for-linus' of git://git.kernel.org/pub/scm/linux/kernel/git/ericvh/v9fs:
  fs/9p: Fix atomic_open
  fs/9p: Don't use O_TRUNC flag in TOPEN and TLOPEN request
  locking in fs/9p ->readdir()

4 files changed, 31 insertions, 79 deletions

diff --git a/fs/9p/vfs_dir.c b/fs/9p/vfs_dir.c
index ff911e77965..be1e34adc3c 100644
--- a/fs/9p/vfs_dir.c
+++ b/fs/9p/vfs_dir.c
@@ -52,10 +52,9 @@
  */
 
 struct p9_rdir {
-	struct mutex mutex;
 	int head;
 	int tail;
-	uint8_t *buf;
+	uint8_t buf[];
 };
 
 /**
@@ -93,33 +92,12 @@ static void p9stat_init(struct p9_wstat *stbuf)
  *
  */
 
-static int v9fs_alloc_rdir_buf(struct file *filp, int buflen)
+static struct p9_rdir *v9fs_alloc_rdir_buf(struct file *filp, int buflen)
 {
-	struct p9_rdir *rdir;
-	struct p9_fid *fid;
-	int err = 0;
-
-	fid = filp->private_data;
-	if (!fid->rdir) {
-		rdir = kmalloc(sizeof(struct p9_rdir) + buflen, GFP_KERNEL);
-
-		if (rdir == NULL) {
-			err = -ENOMEM;
-			goto exit;
-		}
-		spin_lock(&filp->f_dentry->d_lock);
-		if (!fid->rdir) {
-			rdir->buf = (uint8_t *)rdir + sizeof(struct p9_rdir);
-			mutex_init(&rdir->mutex);
-			rdir->head = rdir->tail = 0;
-			fid->rdir = (void *) rdir;
-			rdir = NULL;
-		}
-		spin_unlock(&filp->f_dentry->d_lock);
-		kfree(rdir);
-	}
-exit:
-	return err;
+	struct p9_fid *fid = filp->private_data;
+	if (!fid->rdir)
+		fid->rdir = kzalloc(sizeof(struct p9_rdir) + buflen, GFP_KERNEL);
+	return fid->rdir;
 }
 
 /**
@@ -145,20 +123,16 @@ static int v9fs_dir_readdir(struct file *filp, void *dirent, filldir_t filldir)
 
 	buflen = fid->clnt->msize - P9_IOHDRSZ;
 
-	err = v9fs_alloc_rdir_buf(filp, buflen);
-	if (err)
-		goto exit;
-	rdir = (struct p9_rdir *) fid->rdir;
+	rdir = v9fs_alloc_rdir_buf(filp, buflen);
+	if (!rdir)
+		return -ENOMEM;
 
-	err = mutex_lock_interruptible(&rdir->mutex);
-	if (err)
-		return err;
-	while (err == 0) {
+	while (1) {
 		if (rdir->tail == rdir->head) {
 			err = v9fs_file_readn(filp, rdir->buf, NULL,
 							buflen, filp->f_pos);
 			if (err <= 0)
-				goto unlock_and_exit;
+				return err;
 
 			rdir->head = 0;
 			rdir->tail = err;
@@ -169,9 +143,8 @@ static int v9fs_dir_readdir(struct file *filp, void *dirent, filldir_t filldir)
 					  rdir->tail - rdir->head, &st);
 			if (err) {
 				p9_debug(P9_DEBUG_VFS, "returned %d\n", err);
-				err = -EIO;
 				p9stat_free(&st);
-				goto unlock_and_exit;
+				return -EIO;
 			}
 			reclen = st.size+2;
 
@@ -180,19 +153,13 @@ static int v9fs_dir_readdir(struct file *filp, void *dirent, filldir_t filldir)
 
 			p9stat_free(&st);
 
-			if (over) {
-				err = 0;
-				goto unlock_and_exit;
-			}
+			if (over)
+				return 0;
+
 			rdir->head += reclen;
 			filp->f_pos += reclen;
 		}
 	}
-
-unlock_and_exit:
-	mutex_unlock(&rdir->mutex);
-exit:
-	return err;
 }
 
 /**
@@ -218,21 +185,16 @@ static int v9fs_dir_readdir_dotl(struct file *filp, void *dirent,
 
 	buflen = fid->clnt->msize - P9_READDIRHDRSZ;
 
-	err = v9fs_alloc_rdir_buf(filp, buflen);
-	if (err)
-		goto exit;
-	rdir = (struct p9_rdir *) fid->rdir;
+	rdir = v9fs_alloc_rdir_buf(filp, buflen);
+	if (!rdir)
+		return -ENOMEM;
 
-	err = mutex_lock_interruptible(&rdir->mutex);
-	if (err)
-		return err;
-
-	while (err == 0) {
+	while (1) {
 		if (rdir->tail == rdir->head) {
 			err = p9_client_readdir(fid, rdir->buf, buflen,
 						filp->f_pos);
 			if (err <= 0)
-				goto unlock_and_exit;
+				return err;
 
 			rdir->head = 0;
 			rdir->tail = err;
@@ -245,8 +207,7 @@ static int v9fs_dir_readdir_dotl(struct file *filp, void *dirent,
 					    &curdirent);
 			if (err < 0) {
 				p9_debug(P9_DEBUG_VFS, "returned %d\n", err);
-				err = -EIO;
-				goto unlock_and_exit;
+				return -EIO;
 			}
 
 			/* d_off in dirent structure tracks the offset into
@@ -261,20 +222,13 @@ static int v9fs_dir_readdir_dotl(struct file *filp, void *dirent,
 					curdirent.d_type);
 			oldoffset = curdirent.d_off;
 
-			if (over) {
-				err = 0;
-				goto unlock_and_exit;
-			}
+			if (over)
+				return 0;
 
 			filp->f_pos = curdirent.d_off;
 			rdir->head += err;
 		}
 	}
-
-unlock_and_exit:
-	mutex_unlock(&rdir->mutex);
-exit:
-	return err;
 }
 
 
diff --git a/fs/9p/vfs_file.c b/fs/9p/vfs_file.c
index c2483e97bee..7a339976757 100644
--- a/fs/9p/vfs_file.c
+++ b/fs/9p/vfs_file.c
@@ -80,10 +80,6 @@ int v9fs_file_open(struct inode *inode, struct file *file)
 			p9_client_clunk(fid);
 			return err;
 		}
-		if (file->f_flags & O_TRUNC) {
-			i_size_write(inode, 0);
-			inode->i_blocks = 0;
-		}
 		if ((file->f_flags & O_APPEND) &&
 			(!v9fs_proto_dotu(v9ses) && !v9fs_proto_dotl(v9ses)))
 			generic_file_llseek(file, 0, SEEK_END);
diff --git a/fs/9p/vfs_inode.c b/fs/9p/vfs_inode.c
index 890bed538f9..57d017ac68e 100644
--- a/fs/9p/vfs_inode.c
+++ b/fs/9p/vfs_inode.c
@@ -192,9 +192,6 @@ int v9fs_uflags2omode(int uflags, int extended)
 		break;
 	}
 
-	if (uflags & O_TRUNC)
-		ret |= P9_OTRUNC;
-
 	if (extended) {
 		if (uflags & O_EXCL)
 			ret |= P9_OEXCL;
diff --git a/fs/9p/vfs_inode_dotl.c b/fs/9p/vfs_inode_dotl.c
index 40895546e10..8d24ad66dfb 100644
--- a/fs/9p/vfs_inode_dotl.c
+++ b/fs/9p/vfs_inode_dotl.c
@@ -186,7 +186,6 @@ static int v9fs_mapped_dotl_flags(int flags)
 		{ O_CREAT,	P9_DOTL_CREATE },
 		{ O_EXCL,	P9_DOTL_EXCL },
 		{ O_NOCTTY,	P9_DOTL_NOCTTY },
-		{ O_TRUNC,	P9_DOTL_TRUNC },
 		{ O_APPEND,	P9_DOTL_APPEND },
 		{ O_NONBLOCK,	P9_DOTL_NONBLOCK },
 		{ O_DSYNC,	P9_DOTL_DSYNC },
@@ -268,8 +267,14 @@ v9fs_vfs_atomic_open_dotl(struct inode *dir, struct dentry *dentry,
 	}
 
 	/* Only creates */
-	if (!(flags & O_CREAT) || dentry->d_inode)
-		return finish_no_open(file, res);
+	if (!(flags & O_CREAT))
+		return	finish_no_open(file, res);
+	else if (dentry->d_inode) {
+		if ((flags & (O_CREAT | O_EXCL)) == (O_CREAT | O_EXCL))
+			return -EEXIST;
+		else
+			return finish_no_open(file, res);
+	}
 
 	v9ses = v9fs_inode2v9ses(dir);