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Commit 99d1419d authored by JANAK DESAI's avatar JANAK DESAI Committed by Linus Torvalds
Browse files

[PATCH] unshare system call -v5: unshare filesystem info 



If filesystem structure is being shared, allocate a new one and copy
information from the current, shared, structure.

Signed-off-by: default avatarJanak Desai <janak@us.ibm.com>
Cc: Al Viro <viro@ftp.linux.org.uk>
Cc: Christoph Hellwig <hch@lst.de>
Cc: Michael Kerrisk <mtk-manpages@gmx.net>
Cc: Andi Kleen <ak@muc.de>
Cc: Paul Mackerras <paulus@samba.org>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent cf2e340f

kernel/fork.c

+6 −3
Original line number Original line Diff line number Diff line
@@ -1371,15 +1371,18 @@ static int unshare_thread(unsigned long unshare_flags) 
}

}





/*

/*

 * Unsharing of fs info for tasks created with CLONE_FS is not supported yet

 * Unshare the filesystem structure if it is being shared

 */

 */

static int unshare_fs(unsigned long unshare_flags, struct fs_struct **new_fsp)

static int unshare_fs(unsigned long unshare_flags, struct fs_struct **new_fsp)

{

{

	struct fs_struct *fs = current->fs;

	struct fs_struct *fs = current->fs;





	if ((unshare_flags & CLONE_FS) &&

	if ((unshare_flags & CLONE_FS) &&

	    (fs && atomic_read(&fs->count) > 1))

	    (fs && atomic_read(&fs->count) > 1)) {

		return -EINVAL;

		*new_fsp = __copy_fs_struct(current->fs);

		if (!*new_fsp)

			return -ENOMEM;

	}





	return 0;

	return 0;

}

}