int gfs2_acl_create(struct gfs2_inode *dip, struct inode *inode) { struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode); struct posix_acl *acl, *clone; mode_t mode = inode->i_mode; int error = 0; if (!sdp->sd_args.ar_posix_acl) return 0; if (S_ISLNK(inode->i_mode)) return 0; acl = gfs2_acl_get(dip, ACL_TYPE_DEFAULT); if (IS_ERR(acl)) return PTR_ERR(acl); if (!acl) { mode &= ~current_umask(); if (mode != inode->i_mode) error = gfs2_set_mode(inode, mode); return error; } if (S_ISDIR(inode->i_mode)) { error = gfs2_acl_set(inode, ACL_TYPE_DEFAULT, acl); if (error) goto out; } clone = posix_acl_clone(acl, GFP_NOFS); error = -ENOMEM; if (!clone) goto out; posix_acl_release(acl); acl = clone; error = posix_acl_create_masq(acl, &mode); if (error < 0) goto out; if (error == 0) goto munge; error = gfs2_acl_set(inode, ACL_TYPE_ACCESS, acl); if (error) goto out; munge: error = gfs2_set_mode(inode, mode); out: posix_acl_release(acl); return error; }
static int gfs2_xattr_system_set(struct dentry *dentry, const char *name, const void *value, size_t size, int flags, int xtype) { struct inode *inode = dentry->d_inode; struct gfs2_sbd *sdp = GFS2_SB(inode); struct posix_acl *acl = NULL; int error = 0, type; if (!sdp->sd_args.ar_posix_acl) return -EOPNOTSUPP; type = gfs2_acl_type(name); if (type < 0) return type; if (flags & XATTR_CREATE) return -EINVAL; if (type == ACL_TYPE_DEFAULT && !S_ISDIR(inode->i_mode)) return value ? -EACCES : 0; if ((current_fsuid() != inode->i_uid) && !capable(CAP_FOWNER)) return -EPERM; if (S_ISLNK(inode->i_mode)) return -EOPNOTSUPP; if (!value) goto set_acl; acl = posix_acl_from_xattr(value, size); if (!acl) { /* * acl_set_file(3) may request that we set default ACLs with * zero length -- defend (gracefully) against that here. */ goto out; } if (IS_ERR(acl)) { error = PTR_ERR(acl); goto out; } error = posix_acl_valid(acl); if (error) goto out_release; error = -EINVAL; if (acl->a_count > GFS2_ACL_MAX_ENTRIES) goto out_release; if (type == ACL_TYPE_ACCESS) { umode_t mode = inode->i_mode; error = posix_acl_equiv_mode(acl, &mode); if (error <= 0) { posix_acl_release(acl); acl = NULL; if (error < 0) return error; } error = gfs2_set_mode(inode, mode); if (error) goto out_release; } set_acl: error = __gfs2_xattr_set(inode, name, value, size, 0, GFS2_EATYPE_SYS); if (!error) { if (acl) set_cached_acl(inode, type, acl); else forget_cached_acl(inode, type); } out_release: posix_acl_release(acl); out: return error; }