From 99d1419d96d7df9cfa56bc977810be831bd5ef64 Mon Sep 17 00:00:00 2001
From: JANAK DESAI <janak@us.ibm.com>
Date: Tue, 7 Feb 2006 12:58:59 -0800
Subject: [PATCH] [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: Janak 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: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
---
kernel/fork.c | 9 ++++++---
1 file changed, 6 insertions(+), 3 deletions(-)
diff --git a/kernel/fork.c b/kernel/fork.c
index 6eb9362775f9..598e5c27242c 100644
--- a/kernel/fork.c
+++ b/kernel/fork.c
@@ -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)
{
struct fs_struct *fs = current->fs;
if ((unshare_flags & CLONE_FS) &&
- (fs && atomic_read(&fs->count) > 1))
- return -EINVAL;
+ (fs && atomic_read(&fs->count) > 1)) {
+ *new_fsp = __copy_fs_struct(current->fs);
+ if (!*new_fsp)
+ return -ENOMEM;
+ }
return 0;
}
--
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