1 files changed, 309 insertions, 0 deletions

diff --git a/fs/gfs2/acl.c b/fs/gfs2/acl.c
new file mode 100644
index 000000000000..5f959b8ce406
--- /dev/null
+++ b/fs/gfs2/acl.c
@@ -0,0 +1,309 @@
+/*
+ * Copyright (C) Sistina Software, Inc.  1997-2003 All rights reserved.
+ * Copyright (C) 2004-2006 Red Hat, Inc.  All rights reserved.
+ *
+ * This copyrighted material is made available to anyone wishing to use,
+ * modify, copy, or redistribute it subject to the terms and conditions
+ * of the GNU General Public License version 2.
+ */
+
+#include <linux/sched.h>
+#include <linux/slab.h>
+#include <linux/spinlock.h>
+#include <linux/completion.h>
+#include <linux/buffer_head.h>
+#include <linux/posix_acl.h>
+#include <linux/posix_acl_xattr.h>
+#include <linux/gfs2_ondisk.h>
+#include <linux/lm_interface.h>
+
+#include "gfs2.h"
+#include "incore.h"
+#include "acl.h"
+#include "eaops.h"
+#include "eattr.h"
+#include "glock.h"
+#include "inode.h"
+#include "meta_io.h"
+#include "trans.h"
+#include "util.h"
+
+#define ACL_ACCESS 1
+#define ACL_DEFAULT 0
+
+int gfs2_acl_validate_set(struct gfs2_inode *ip, int access,
+                      struct gfs2_ea_request *er,
+                      int *remove, mode_t *mode)
+{
+        struct posix_acl *acl;
+        int error;
+
+        error = gfs2_acl_validate_remove(ip, access);
+        if (error)
+                return error;
+
+        if (!er->er_data)
+                return -EINVAL;
+
+        acl = posix_acl_from_xattr(er->er_data, er->er_data_len);
+        if (IS_ERR(acl))
+                return PTR_ERR(acl);
+        if (!acl) {
+                *remove = 1;
+                return 0;
+        }
+
+        error = posix_acl_valid(acl);
+        if (error)
+                goto out;
+
+        if (access) {
+                error = posix_acl_equiv_mode(acl, mode);
+                if (!error)
+                        *remove = 1;
+                else if (error > 0)
+                        error = 0;
+        }
+
+out:
+        posix_acl_release(acl);
+        return error;
+}
+
+int gfs2_acl_validate_remove(struct gfs2_inode *ip, int access)
+{
+        if (!GFS2_SB(&ip->i_inode)->sd_args.ar_posix_acl)
+                return -EOPNOTSUPP;
+        if (current->fsuid != ip->i_di.di_uid && !capable(CAP_FOWNER))
+                return -EPERM;
+        if (S_ISLNK(ip->i_di.di_mode))
+                return -EOPNOTSUPP;
+        if (!access && !S_ISDIR(ip->i_di.di_mode))
+                return -EACCES;
+
+        return 0;
+}
+
+static int acl_get(struct gfs2_inode *ip, int access, struct posix_acl **acl,
+                   struct gfs2_ea_location *el, char **data, unsigned int *len)
+{
+        struct gfs2_ea_request er;
+        struct gfs2_ea_location el_this;
+        int error;
+
+        if (!ip->i_di.di_eattr)
+                return 0;
+
+        memset(&er, 0, sizeof(struct gfs2_ea_request));
+        if (access) {
+                er.er_name = GFS2_POSIX_ACL_ACCESS;
+                er.er_name_len = GFS2_POSIX_ACL_ACCESS_LEN;
+        } else {
+                er.er_name = GFS2_POSIX_ACL_DEFAULT;
+                er.er_name_len = GFS2_POSIX_ACL_DEFAULT_LEN;
+        }
+        er.er_type = GFS2_EATYPE_SYS;
+
+        if (!el)
+                el = &el_this;
+
+        error = gfs2_ea_find(ip, &er, el);
+        if (error)
+                return error;
+        if (!el->el_ea)
+                return 0;
+        if (!GFS2_EA_DATA_LEN(el->el_ea))
+                goto out;
+
+        er.er_data_len = GFS2_EA_DATA_LEN(el->el_ea);
+        er.er_data = kmalloc(er.er_data_len, GFP_KERNEL);
+        error = -ENOMEM;
+        if (!er.er_data)
+                goto out;
+
+        error = gfs2_ea_get_copy(ip, el, er.er_data);
+        if (error)
+                goto out_kfree;
+
+        if (acl) {
+                *acl = posix_acl_from_xattr(er.er_data, er.er_data_len);
+                if (IS_ERR(*acl))
+                        error = PTR_ERR(*acl);
+        }
+
+out_kfree:
+        if (error || !data)
+                kfree(er.er_data);
+        else {
+                *data = er.er_data;
+                *len = er.er_data_len;
+        }
+out:
+        if (error || el == &el_this)
+                brelse(el->el_bh);
+        return error;
+}
+
+/**
+ * gfs2_check_acl_locked - Check an ACL to see if we're allowed to do something
+ * @inode: the file we want to do something to
+ * @mask: what we want to do
+ *
+ * Returns: errno
+ */
+
+int gfs2_check_acl_locked(struct inode *inode, int mask)
+{
+        struct posix_acl *acl = NULL;
+        int error;
+
+        error = acl_get(GFS2_I(inode), ACL_ACCESS, &acl, NULL, NULL, NULL);
+        if (error)
+                return error;
+
+        if (acl) {
+                error = posix_acl_permission(inode, acl, mask);
+                posix_acl_release(acl);
+                return error;
+        }
+
+        return -EAGAIN;
+}
+
+int gfs2_check_acl(struct inode *inode, int mask)
+{
+        struct gfs2_inode *ip = GFS2_I(inode);
+        struct gfs2_holder i_gh;
+        int error;
+
+        error = gfs2_glock_nq_init(ip->i_gl, LM_ST_SHARED, LM_FLAG_ANY, &i_gh);
+        if (!error) {
+                error = gfs2_check_acl_locked(inode, mask);
+                gfs2_glock_dq_uninit(&i_gh);
+        }
+
+        return error;
+}
+
+static int munge_mode(struct gfs2_inode *ip, mode_t mode)
+{
+        struct gfs2_sbd *sdp = GFS2_SB(&ip->i_inode);
+        struct buffer_head *dibh;
+        int error;
+
+        error = gfs2_trans_begin(sdp, RES_DINODE, 0);
+        if (error)
+                return error;
+
+        error = gfs2_meta_inode_buffer(ip, &dibh);
+        if (!error) {
+                gfs2_assert_withdraw(sdp,
+                                (ip->i_di.di_mode & S_IFMT) == (mode & S_IFMT));
+                ip->i_di.di_mode = mode;
+                gfs2_trans_add_bh(ip->i_gl, dibh, 1);
+                gfs2_dinode_out(&ip->i_di, dibh->b_data);
+                brelse(dibh);
+        }
+
+        gfs2_trans_end(sdp);
+
+        return 0;
+}
+
+int gfs2_acl_create(struct gfs2_inode *dip, struct gfs2_inode *ip)
+{
+        struct gfs2_sbd *sdp = GFS2_SB(&dip->i_inode);
+        struct posix_acl *acl = NULL, *clone;
+        struct gfs2_ea_request er;
+        mode_t mode = ip->i_di.di_mode;
+        int error;
+
+        if (!sdp->sd_args.ar_posix_acl)
+                return 0;
+        if (S_ISLNK(ip->i_di.di_mode))
+                return 0;
+
+        memset(&er, 0, sizeof(struct gfs2_ea_request));
+        er.er_type = GFS2_EATYPE_SYS;
+
+        error = acl_get(dip, ACL_DEFAULT, &acl, NULL,
+                        &er.er_data, &er.er_data_len);
+        if (error)
+                return error;
+        if (!acl) {
+                mode &= ~current->fs->umask;
+                if (mode != ip->i_di.di_mode)
+                        error = munge_mode(ip, mode);
+                return error;
+        }
+
+        clone = posix_acl_clone(acl, GFP_KERNEL);
+        error = -ENOMEM;
+        if (!clone)
+                goto out;
+        posix_acl_release(acl);
+        acl = clone;
+
+        if (S_ISDIR(ip->i_di.di_mode)) {
+                er.er_name = GFS2_POSIX_ACL_DEFAULT;
+                er.er_name_len = GFS2_POSIX_ACL_DEFAULT_LEN;
+                error = gfs2_system_eaops.eo_set(ip, &er);
+                if (error)
+                        goto out;
+        }
+
+        error = posix_acl_create_masq(acl, &mode);
+        if (error < 0)
+                goto out;
+        if (error > 0) {
+                er.er_name = GFS2_POSIX_ACL_ACCESS;
+                er.er_name_len = GFS2_POSIX_ACL_ACCESS_LEN;
+                posix_acl_to_xattr(acl, er.er_data, er.er_data_len);
+                er.er_mode = mode;
+                er.er_flags = GFS2_ERF_MODE;
+                error = gfs2_system_eaops.eo_set(ip, &er);
+                if (error)
+                        goto out;
+        } else
+                munge_mode(ip, mode);
+
+out:
+        posix_acl_release(acl);
+        kfree(er.er_data);
+        return error;
+}
+
+int gfs2_acl_chmod(struct gfs2_inode *ip, struct iattr *attr)
+{
+        struct posix_acl *acl = NULL, *clone;
+        struct gfs2_ea_location el;
+        char *data;
+        unsigned int len;
+        int error;
+
+        error = acl_get(ip, ACL_ACCESS, &acl, &el, &data, &len);
+        if (error)
+                return error;
+        if (!acl)
+                return gfs2_setattr_simple(ip, attr);
+
+        clone = posix_acl_clone(acl, GFP_KERNEL);
+        error = -ENOMEM;
+        if (!clone)
+                goto out;
+        posix_acl_release(acl);
+        acl = clone;
+
+        error = posix_acl_chmod_masq(acl, attr->ia_mode);
+        if (!error) {
+                posix_acl_to_xattr(acl, data, len);
+                error = gfs2_ea_acl_chmod(ip, &el, attr, data);
+        }
+
+out:
+        posix_acl_release(acl);
+        brelse(el.el_bh);
+        kfree(data);
+        return error;
+}
+