From: Ajay Kaher <akaher@vmware.com>
To: <gregkh@linuxfoundation.org>
Cc: <torvalds@linux-foundation.org>, <aarcange@redhat.com>,
<hughd@google.com>, <dave.hansen@intel.com>, <mgorman@suse.de>,
<riel@redhat.com>, <mhocko@suse.cz>, <jannh@google.com>,
<linux-kernel@vger.kernel.org>, <stable@kernel.org>,
<stable@vger.kernel.org>, <srivatsab@vmware.com>,
<srivatsa@csail.mit.edu>, <amakhalov@vmware.com>,
<srinidhir@vmware.com>, <bvikas@vmware.com>,
<srostedt@vmware.com>, <akaher@vmware.com>,
Miklos Szeredi <mszeredi@redhat.com>,
Al Viro <viro@zeniv.linux.org.uk>
Subject: [PATCH 7/8] pipe: add pipe_buf_get() helper
Date: Tue, 23 Jul 2019 16:38:30 +0530 [thread overview]
Message-ID: <1563880111-19058-8-git-send-email-akaher@vmware.com> (raw)
In-Reply-To: <1563880111-19058-1-git-send-email-akaher@vmware.com>
From: Miklos Szeredi <mszeredi@redhat.com>
commit 7bf2d1df80822ec056363627e2014990f068f7aa upstream.
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>
Signed-off-by: Ajay Kaher <akaher@vmware.com>
Reviewed-by: Srivatsa S. Bhat (VMware) <srivatsa@csail.mit.edu>
---
fs/fuse/dev.c | 2 +-
fs/splice.c | 4 ++--
include/linux/pipe_fs_i.h | 11 +++++++++++
3 files changed, 14 insertions(+), 3 deletions(-)
diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c
index f5d2d23..36a5df9 100644
--- a/fs/fuse/dev.c
+++ b/fs/fuse/dev.c
@@ -2052,7 +2052,7 @@ static ssize_t fuse_dev_splice_write(struct pipe_inode_info *pipe,
pipe->curbuf = (pipe->curbuf + 1) & (pipe->buffers - 1);
pipe->nrbufs--;
} else {
- ibuf->ops->get(pipe, ibuf);
+ pipe_buf_get(pipe, ibuf);
*obuf = *ibuf;
obuf->flags &= ~PIPE_BUF_FLAG_GIFT;
obuf->len = rem;
diff --git a/fs/splice.c b/fs/splice.c
index 8398974..fde1263 100644
--- a/fs/splice.c
+++ b/fs/splice.c
@@ -1876,7 +1876,7 @@ retry:
* Get a reference to this pipe buffer,
* so we can copy the contents over.
*/
- ibuf->ops->get(ipipe, ibuf);
+ pipe_buf_get(ipipe, ibuf);
*obuf = *ibuf;
/*
@@ -1948,7 +1948,7 @@ static int link_pipe(struct pipe_inode_info *ipipe,
* Get a reference to this pipe buffer,
* so we can copy the contents over.
*/
- ibuf->ops->get(ipipe, ibuf);
+ pipe_buf_get(ipipe, ibuf);
obuf = opipe->bufs + nbuf;
*obuf = *ibuf;
diff --git a/include/linux/pipe_fs_i.h b/include/linux/pipe_fs_i.h
index 24f5470..10876f3 100644
--- a/include/linux/pipe_fs_i.h
+++ b/include/linux/pipe_fs_i.h
@@ -115,6 +115,17 @@ struct pipe_buf_operations {
void (*get)(struct pipe_inode_info *, struct pipe_buffer *);
};
+/**
+ * pipe_buf_get - get a reference to a pipe_buffer
+ * @pipe: the pipe that the buffer belongs to
+ * @buf: the buffer to get a reference to
+ */
+static inline void pipe_buf_get(struct pipe_inode_info *pipe,
+ struct pipe_buffer *buf)
+{
+ buf->ops->get(pipe, buf);
+}
+
/* Differs from PIPE_BUF in that PIPE_SIZE is the length of the actual
memory allocation, whereas PIPE_BUF makes atomicity guarantees. */
#define PIPE_SIZE PAGE_SIZE
--
2.7.4
next prev parent reply other threads:[~2019-07-23 3:09 UTC|newest]
Thread overview: 11+ messages / expand[flat|nested] mbox.gz Atom feed top
2019-07-23 11:08 [PATCH 0/8] Backported fixes for 4.4 stable tree Ajay Kaher
2019-07-23 11:08 ` [PATCH 1/8] mm: make page ref count overflow check tighter and more explicit Ajay Kaher
2019-07-23 11:08 ` [PATCH 2/8] mm: add 'try_get_page()' helper function Ajay Kaher
2019-07-23 11:08 ` [PATCH 3/8] mm: handle PTE-mapped tail pages in gerneric fast gup implementaiton Ajay Kaher
2019-07-23 11:08 ` [PATCH 4/8] mm, gup: remove broken VM_BUG_ON_PAGE compound check for hugepages Ajay Kaher
2019-07-23 11:08 ` [PATCH 5/8] mm, gup: ensure real head page is ref-counted when using hugepages Ajay Kaher
2019-07-23 11:08 ` [PATCH 6/8] mm: prevent get_user_pages() from overflowing page refcount Ajay Kaher
2019-07-23 11:08 ` Ajay Kaher [this message]
2019-07-23 11:08 ` [PATCH 8/8] fs: prevent page refcount overflow in pipe_buf_get Ajay Kaher
2019-07-24 12:06 ` [PATCH 0/8] Backported fixes for 4.4 stable tree Greg KH
2019-08-01 16:57 ` Greg KH
Reply instructions:
You may reply publicly to this message via plain-text email
using any one of the following methods:
* Save the following mbox file, import it into your mail client,
and reply-to-all from there: mbox
Avoid top-posting and favor interleaved quoting:
https://en.wikipedia.org/wiki/Posting_style#Interleaved_style
* Reply using the --to, --cc, and --in-reply-to
switches of git-send-email(1):
git send-email \
--in-reply-to=1563880111-19058-8-git-send-email-akaher@vmware.com \
--to=akaher@vmware.com \
--cc=aarcange@redhat.com \
--cc=amakhalov@vmware.com \
--cc=bvikas@vmware.com \
--cc=dave.hansen@intel.com \
--cc=gregkh@linuxfoundation.org \
--cc=hughd@google.com \
--cc=jannh@google.com \
--cc=linux-kernel@vger.kernel.org \
--cc=mgorman@suse.de \
--cc=mhocko@suse.cz \
--cc=mszeredi@redhat.com \
--cc=riel@redhat.com \
--cc=srinidhir@vmware.com \
--cc=srivatsa@csail.mit.edu \
--cc=srivatsab@vmware.com \
--cc=srostedt@vmware.com \
--cc=stable@kernel.org \
--cc=stable@vger.kernel.org \
--cc=torvalds@linux-foundation.org \
--cc=viro@zeniv.linux.org.uk \
/path/to/YOUR_REPLY
https://kernel.org/pub/software/scm/git/docs/git-send-email.html
* If your mail client supports setting the In-Reply-To header
via mailto: links, try the mailto: link
Be sure your reply has a Subject: header at the top and a blank line
before the message body.
This is a public inbox, see mirroring instructions
for how to clone and mirror all data and code used for this inbox;
as well as URLs for NNTP newsgroup(s).