[to-be-updated] hugetlbfs-add-o_tmpfile-support.patch removed from -mm tree

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The patch titled
     Subject: hugetlbfs: add O_TMPFILE support
has been removed from the -mm tree.  Its filename was
     hugetlbfs-add-o_tmpfile-support.patch

This patch was dropped because an updated version will be merged

------------------------------------------------------
From: Piotr Sarna <p.sarna@xxxxxxx>
Subject: hugetlbfs: add O_TMPFILE support

O_TMPFILE is an option used to create an unnamed temporary regular file. 
Currently, libhugetlbfs and Seastar use a combination of mkstemp and
unlink to accomplish similar functionality on hugetlbfs.  Add O_TMPFILE
support to hugetlbfs so that it can potentially be used by existing users
(Seastar) and new users (Oracle DB).  Support is added by simply using the
d_tmpfile utility function to instantiate the dcache entry for a temporary
file.

Tested manually by successfully creating a temporary file by opening it
with (O_TMPFILE|O_RDWR) on mounted hugetlbfs and successfully mapping 2M
huge pages with it.  Without the patch, trying to open a file with
O_TMPFILE results in -ENOSUP.

[mike.kravetz@xxxxxxxxxx: changelog updates]
Link: http://lkml.kernel.org/r/22c29acf9c51dae17802e1b05c9e5e4051448c5c.1571129593.git.p.sarna@xxxxxxx
Signed-off-by: Piotr Sarna <p.sarna@xxxxxxx>
Reviewed-by: Mike Kravetz <mike.kravetz@xxxxxxxxxx>
Cc: Michal Hocko <mhocko@xxxxxxxxxx>
Cc: Al Viro <viro@xxxxxxxxxxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---

 fs/hugetlbfs/inode.c |   25 ++++++++++++++++++++++---
 1 file changed, 22 insertions(+), 3 deletions(-)

--- a/fs/hugetlbfs/inode.c~hugetlbfs-add-o_tmpfile-support
+++ a/fs/hugetlbfs/inode.c
@@ -815,8 +815,11 @@ static struct inode *hugetlbfs_get_inode
 /*
  * File creation. Allocate an inode, and we're done..
  */
-static int hugetlbfs_mknod(struct inode *dir,
-			struct dentry *dentry, umode_t mode, dev_t dev)
+static int do_hugetlbfs_mknod(struct inode *dir,
+			struct dentry *dentry,
+			umode_t mode,
+			dev_t dev,
+			bool tmpfile)
 {
 	struct inode *inode;
 	int error = -ENOSPC;
@@ -824,13 +827,22 @@ static int hugetlbfs_mknod(struct inode
 	inode = hugetlbfs_get_inode(dir->i_sb, dir, mode, dev);
 	if (inode) {
 		dir->i_ctime = dir->i_mtime = current_time(dir);
-		d_instantiate(dentry, inode);
+		if (tmpfile)
+			d_tmpfile(dentry, inode);
+		else
+			d_instantiate(dentry, inode);
 		dget(dentry);	/* Extra count - pin the dentry in core */
 		error = 0;
 	}
 	return error;
 }
 
+static int hugetlbfs_mknod(struct inode *dir,
+			struct dentry *dentry, umode_t mode, dev_t dev)
+{
+	return do_hugetlbfs_mknod(dir, dentry, mode, dev, false);
+}
+
 static int hugetlbfs_mkdir(struct inode *dir, struct dentry *dentry, umode_t mode)
 {
 	int retval = hugetlbfs_mknod(dir, dentry, mode | S_IFDIR, 0);
@@ -844,6 +856,12 @@ static int hugetlbfs_create(struct inode
 	return hugetlbfs_mknod(dir, dentry, mode | S_IFREG, 0);
 }
 
+static int hugetlbfs_tmpfile(struct inode *dir,
+			struct dentry *dentry, umode_t mode)
+{
+	return do_hugetlbfs_mknod(dir, dentry, mode | S_IFREG, 0, true);
+}
+
 static int hugetlbfs_symlink(struct inode *dir,
 			struct dentry *dentry, const char *symname)
 {
@@ -1102,6 +1120,7 @@ static const struct inode_operations hug
 	.mknod		= hugetlbfs_mknod,
 	.rename		= simple_rename,
 	.setattr	= hugetlbfs_setattr,
+	.tmpfile	= hugetlbfs_tmpfile,
 };
 
 static const struct inode_operations hugetlbfs_inode_operations = {
_

Patches currently in -mm which might be from p.sarna@xxxxxxx are






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