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authorJANAK DESAI <janak@us.ibm.com>2006-02-07 15:58:59 -0500
committerLinus Torvalds <torvalds@g5.osdl.org>2006-02-07 19:12:34 -0500
commit99d1419d96d7df9cfa56bc977810be831bd5ef64 (patch)
tree994e2fe33cef91933d299af9c26ddb9a92da58f4 /kernel
parentcf2e340f4249b781b3d2beb41e891d08581f0e10 (diff)
[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')
-rw-r--r--kernel/fork.c9
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)
1371} 1371}
1372 1372
1373/* 1373/*
1374 * Unsharing of fs info for tasks created with CLONE_FS is not supported yet 1374 * Unshare the filesystem structure if it is being shared
1375 */ 1375 */
1376static int unshare_fs(unsigned long unshare_flags, struct fs_struct **new_fsp) 1376static int unshare_fs(unsigned long unshare_flags, struct fs_struct **new_fsp)
1377{ 1377{
1378 struct fs_struct *fs = current->fs; 1378 struct fs_struct *fs = current->fs;
1379 1379
1380 if ((unshare_flags & CLONE_FS) && 1380 if ((unshare_flags & CLONE_FS) &&
1381 (fs && atomic_read(&fs->count) > 1)) 1381 (fs && atomic_read(&fs->count) > 1)) {
1382 return -EINVAL; 1382 *new_fsp = __copy_fs_struct(current->fs);
1383 if (!*new_fsp)
1384 return -ENOMEM;
1385 }
1383 1386
1384 return 0; 1387 return 0;
1385} 1388}