diff options
| author | James Bottomley <James.Bottomley@HansenPartnership.com> | 2016-02-17 16:49:38 -0800 |
|---|---|---|
| committer | James Bottomley <James.Bottomley@HansenPartnership.com> | 2016-03-30 14:12:22 -0700 |
| commit | 9a08c352d05305ca7651540c3b107da1e4e1f40b (patch) | |
| tree | d8b850a2330ab9f98c5a1c00fe54ac741e6e6c82 | |
| parent | f55532a0c0b8bb6148f4e07853b876ef73bc69ca (diff) | |
fs: add filp_clone_open API
I need an API that allows me to obtain a clone of the current file
pointer to pass in to an exec handler. I've labelled this as an
internal API because I can't see how it would be useful outside of the
fs subsystem. The use case will be a persistent binfmt_misc handler.
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
Acked-by: Serge Hallyn <serge.hallyn@canonical.com>
Acked-by: Jan Kara <jack@suse.cz>
| -rw-r--r-- | fs/internal.h | 1 | ||||
| -rw-r--r-- | fs/open.c | 20 |
2 files changed, 21 insertions, 0 deletions
diff --git a/fs/internal.h b/fs/internal.h index b71deeecea17..c8ca0c957743 100644 --- a/fs/internal.h +++ b/fs/internal.h @@ -108,6 +108,7 @@ extern long do_handle_open(int mountdirfd, struct file_handle __user *ufh, int open_flag); extern int open_check_o_direct(struct file *f); extern int vfs_open(const struct path *, struct file *, const struct cred *); +extern struct file *filp_clone_open(struct file *); /* * inode.c diff --git a/fs/open.c b/fs/open.c index 17cb6b1dab75..bfe6f2b8345f 100644 --- a/fs/open.c +++ b/fs/open.c @@ -1002,6 +1002,26 @@ struct file *file_open_root(struct dentry *dentry, struct vfsmount *mnt, } EXPORT_SYMBOL(file_open_root); +struct file *filp_clone_open(struct file *oldfile) +{ + struct file *file; + int retval; + + file = get_empty_filp(); + if (IS_ERR(file)) + return file; + + file->f_flags = oldfile->f_flags; + retval = vfs_open(&oldfile->f_path, file, oldfile->f_cred); + if (retval) { + put_filp(file); + return ERR_PTR(retval); + } + + return file; +} +EXPORT_SYMBOL(filp_clone_open); + long do_sys_open(int dfd, const char __user *filename, int flags, umode_t mode) { struct open_flags op; |