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| author | JANAK DESAI <janak@us.ibm.com> | 2006-02-07 12:58:59 -0800 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-02-07 16:12:34 -0800 |
| commit | 99d1419d96d7df9cfa56bc977810be831bd5ef64 (patch) | |
| tree | 994e2fe33cef91933d299af9c26ddb9a92da58f4 /kernel/fork.c | |
| parent | cf2e340f4249b781b3d2beb41e891d08581f0e10 (diff) | |
| download | lwn-99d1419d96d7df9cfa56bc977810be831bd5ef64.tar.gz lwn-99d1419d96d7df9cfa56bc977810be831bd5ef64.zip | |
[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>
Diffstat (limited to 'kernel/fork.c')
| -rw-r--r-- | kernel/fork.c | 9 |
1 files 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; } |