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 {