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65 lines
1.9 KiB
Diff
65 lines
1.9 KiB
Diff
From eaa6e6d46b260c9f8dbf62f6557ea7898cf5aab5 Mon Sep 17 00:00:00 2001
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From: James Bottomley <James.Bottomley@HansenPartnership.com>
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Date: Wed, 17 Feb 2016 16:49:38 -0800
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Subject: [PATCH 43/44] fs: add filp_clone_open API
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I need an API that allows me to obtain a clone of the current file
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pointer to pass in to an exec handler. I've labelled this as an
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internal API because I can't see how it would be useful outside of the
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fs subsystem. The use case will be a persistent binfmt_misc handler.
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Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
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Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
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Acked-by: Jan Kara <jack@suse.cz>
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---
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fs/internal.h | 1 +
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fs/open.c | 20 ++++++++++++++++++++
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2 files changed, 21 insertions(+)
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diff --git a/fs/internal.h b/fs/internal.h
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index 71859c4d0b41..c0022708ff3a 100644
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--- a/fs/internal.h
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+++ b/fs/internal.h
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@@ -108,6 +108,7 @@ extern long do_handle_open(int mountdirfd,
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struct file_handle __user *ufh, int open_flag);
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extern int open_check_o_direct(struct file *f);
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extern int vfs_open(const struct path *, struct file *, const struct cred *);
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+extern struct file *filp_clone_open(struct file *);
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/*
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* inode.c
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diff --git a/fs/open.c b/fs/open.c
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index 157b9940dd73..9d993f928ea0 100644
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--- a/fs/open.c
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+++ b/fs/open.c
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@@ -1001,6 +1001,26 @@ struct file *file_open_root(struct dentry *dentry, struct vfsmount *mnt,
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}
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EXPORT_SYMBOL(file_open_root);
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+struct file *filp_clone_open(struct file *oldfile)
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+{
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+ struct file *file;
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+ int retval;
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+
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+ file = get_empty_filp();
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+ if (IS_ERR(file))
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+ return file;
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+
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+ file->f_flags = oldfile->f_flags;
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+ retval = vfs_open(&oldfile->f_path, file, oldfile->f_cred);
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+ if (retval) {
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+ put_filp(file);
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+ return ERR_PTR(retval);
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+ }
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+
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+ return file;
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+}
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+EXPORT_SYMBOL(filp_clone_open);
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+
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long do_sys_open(int dfd, const char __user *filename, int flags, umode_t mode)
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{
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struct open_flags op;
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--
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2.11.0
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