Posix ACL support for ext 2/3 filesystems

This patch (as well as the previous one) implements core ACL support which is needed for XFS as well as ext2/3 ACL support. It causes umask handling to be skilled for inodes that contain POSIX acl's, so that the original mode information can be passed down to the low-level fs code, which will take care of handling the umask.

This patch has been requested by the JFS team as well. Linus, please apply.

- Ted

# This is a BitKeeper generated patch for the following project:
# Project Name: Linux kernel tree
# This patch format is intended for GNU patch command version 2.5 or higher. # This patch includes the following deltas:

#	           ChangeSet	1.798   -> 1.799  
#	  include/linux/fs.h	1.172   -> 1.173  
#	          fs/namei.c	1.56    -> 1.57   

#
# The following is the BitKeeper ChangeSet Log
# --------------------------------------------
# 02/10/16 [email protected] 1.799
# Port of 0.8.50 acl-ms-posixacl patch to 2.5
#
# This patch (as well as the previous one) implements core ACL support

# which is needed for XFS as well as ext2/3 ACL support.  It causes umask
# handling to be skilled for inodes that contain POSIX acl's, so that the
# original mode information can be passed down to the low-level fs code,
# which will take care of handling the umask.
# --------------------------------------------
#
diff -Nru a/fs/namei.c b/fs/namei.c
--- a/fs/namei.c	Wed Oct 16 22:54:37 2002
+++ b/fs/namei.c	Wed Oct 16 22:54:37 2002
@@ -1279,8 +1279,9 @@

/* Negative dentry, just create the file */ if (!dentry->d_inode) {
- error = vfs_create(dir->d_inode, dentry,
- mode & ~current->fs->umask);
+ if (!IS_POSIXACL(dir->d_inode))
+ mode &= ~current->fs->umask;
+ error = vfs_create(dir->d_inode, dentry, mode);
up(&dir->d_inode->i_sem); dput(nd->dentry); nd->dentry = dentry;
@@ -1442,7 +1443,8 @@
dentry = lookup_create(&nd, 0); error = PTR_ERR(dentry);

- mode &= ~current->fs->umask;
+ if (!IS_POSIXACL(nd.dentry->d_inode))
+ mode &= ~current->fs->umask;
if (!IS_ERR(dentry)) {
switch (mode & S_IFMT) {
case 0: case S_IFREG:
@@ -1508,8 +1510,9 @@
dentry = lookup_create(&nd, 1);
error = PTR_ERR(dentry);
if (!IS_ERR(dentry)) {
- error = vfs_mkdir(nd.dentry->d_inode, dentry,
- mode & ~current->fs->umask);
+ if (!IS_POSIXACL(nd.dentry->d_inode))
+ mode &= ~current->fs->umask;
+ error = vfs_mkdir(nd.dentry->d_inode, dentry, mode);
dput(dentry);
}
up(&nd.dentry->d_inode->i_sem);

diff -Nru a/include/linux/fs.h b/include/linux/fs.h
@@ -110,6 +110,7 @@
 #define MS_MOVE		8192
 #define MS_REC		16384
 #define MS_VERBOSE	32768
+#define MS_POSIXACL	(1<<16)	/* VFS does not apply the umask */
 #define MS_ACTIVE	(1<<30)
 #define MS_NOUSER	(1<<31)
 

@@ -164,6 +165,7 @@
 #define IS_IMMUTABLE(inode)	((inode)->i_flags & S_IMMUTABLE)
 #define IS_NOATIME(inode)	(__IS_FLG(inode, MS_NOATIME) || ((inode)->i_flags & S_NOATIME))
 #define IS_NODIRATIME(inode)	__IS_FLG(inode, MS_NODIRATIME)
+#define IS_POSIXACL(inode)	__IS_FLG(inode, MS_POSIXACL)
 
 #define IS_DEADDIR(inode)	((inode)->i_flags & S_DEAD)