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From: Kalesh Singh <kaleshsingh@google.com>
To: Jonathan Corbet <corbet@lwn.net>,
	Sumit Semwal <sumit.semwal@linaro.org>,
	Alexander Viro <viro@zeniv.linux.org.uk>,
	Steven Rostedt <rostedt@goodmis.org>,
	Ingo Molnar <mingo@redhat.com>
Cc: linux-doc@vger.kernel.org, linux-kernel@vger.kernel.org,
	linux-media@vger.kernel.org, dri-devel@lists.freedesktop.org,
	linaro-mm-sig@lists.linaro.org, linux-fsdevel@vger.kernel.org,
	Suren Baghdasaryan <surenb@google.com>,
	Hridya Valsaraju <hridya@google.com>,
	Ioannis Ilkos <ilkos@google.com>,
	John Stultz <john.stultz@linaro.org>,
	kernel-team@android.com, Kalesh Singh <kaleshsingh@google.com>
Subject: [PATCH 1/2] fs: Add fd_install file operation
Date: Mon,  3 Aug 2020 14:47:18 +0000	[thread overview]
Message-ID: <20200803144719.3184138-2-kaleshsingh@google.com> (raw)
In-Reply-To: <20200803144719.3184138-1-kaleshsingh@google.com>

Provides a per process hook for the acquisition of file descriptors,
despite the method used to obtain the descriptor.

Signed-off-by: Kalesh Singh <kaleshsingh@google.com>
---
 Documentation/filesystems/vfs.rst | 5 +++++
 fs/file.c                         | 3 +++
 include/linux/fs.h                | 1 +
 3 files changed, 9 insertions(+)

diff --git a/Documentation/filesystems/vfs.rst b/Documentation/filesystems/vfs.rst
index ed17771c212b..95b30142c8d9 100644
--- a/Documentation/filesystems/vfs.rst
+++ b/Documentation/filesystems/vfs.rst
@@ -1123,6 +1123,11 @@ otherwise noted.
 ``fadvise``
 	possibly called by the fadvise64() system call.
 
+``fd_install``
+	called by the VFS when a file descriptor is installed in the
+	process's file descriptor table, regardless how the file descriptor
+	was acquired -- be it via the open syscall, received over IPC, etc.
+
 Note that the file operations are implemented by the specific
 filesystem in which the inode resides.  When opening a device node
 (character or block special) most filesystems will call special
diff --git a/fs/file.c b/fs/file.c
index abb8b7081d7a..f5db8622b851 100644
--- a/fs/file.c
+++ b/fs/file.c
@@ -616,6 +616,9 @@ void __fd_install(struct files_struct *files, unsigned int fd,
 void fd_install(unsigned int fd, struct file *file)
 {
 	__fd_install(current->files, fd, file);
+
+	if (file->f_op->fd_install)
+		file->f_op->fd_install(fd, file);
 }
 
 EXPORT_SYMBOL(fd_install);
diff --git a/include/linux/fs.h b/include/linux/fs.h
index f5abba86107d..b976fbe8c902 100644
--- a/include/linux/fs.h
+++ b/include/linux/fs.h
@@ -1864,6 +1864,7 @@ struct file_operations {
 				   struct file *file_out, loff_t pos_out,
 				   loff_t len, unsigned int remap_flags);
 	int (*fadvise)(struct file *, loff_t, loff_t, int);
+	void (*fd_install)(int, struct file *);
 } __randomize_layout;
 
 struct inode_operations {
-- 
2.28.0.163.g6104cc2f0b6-goog


  reply	other threads:[~2020-08-03 14:50 UTC|newest]

Thread overview: 21+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-08-03 14:47 [PATCH 0/2] Per process tracking of dma buffers Kalesh Singh
2020-08-03 14:47 ` Kalesh Singh [this message]
2020-08-03 16:34   ` [PATCH 1/2] fs: Add fd_install file operation Christoph Hellwig
2020-08-03 18:26     ` Kalesh Singh
2020-08-03 22:18   ` Al Viro
2020-08-04  0:30   ` Joel Fernandes
2020-08-04 13:54     ` Kalesh Singh
2020-08-03 14:47 ` [PATCH 2/2] dmabuf/tracing: Add dma-buf trace events Kalesh Singh
2020-08-03 15:32   ` Steven Rostedt
2020-08-03 16:33     ` Kalesh Singh
2020-08-03 15:41   ` Matthew Wilcox
2020-08-03 16:00     ` Suren Baghdasaryan
2020-08-03 16:12       ` Matthew Wilcox
2020-08-03 16:22         ` Suren Baghdasaryan
2020-08-03 22:28           ` Al Viro
2020-08-04  1:09             ` Al Viro
2020-08-04  2:10               ` Suren Baghdasaryan
2020-08-04 15:44               ` Kalesh Singh
2020-08-04 18:27                 ` Al Viro
2020-08-04 20:42                   ` Kalesh Singh
2020-08-04 20:26             ` Daniel Vetter

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