ocfs2: add ext2 attributes

Support immutable, and other attributes.

Some renaming and other minor fixes done by myself.

Signed-off-by: Herbert Poetzl <herbert@13thfloor.at>
Signed-off-by: Mark Fasheh <mark.fasheh@oracle.com>

1 files changed, 134 insertions, 0 deletions

diff --git a/fs/ocfs2/ioctl.c b/fs/ocfs2/ioctl.c
new file mode 100644
index 000000000000..68f4806d3a35
--- /dev/null
+++ b/fs/ocfs2/ioctl.c
@@ -0,0 +1,134 @@
+/*
+ * linux/fs/ocfs2/ioctl.c
+ *
+ * Copyright (C) 2006 Herbert Poetzl
+ * adapted from Remy Card's ext2/ioctl.c
+ */
+
+#include <linux/fs.h>
+#include <linux/mount.h>
+
+#define MLOG_MASK_PREFIX ML_INODE
+#include <cluster/masklog.h>
+
+#include "ocfs2.h"
+#include "alloc.h"
+#include "dlmglue.h"
+#include "inode.h"
+#include "journal.h"
+
+#include "ocfs2_fs.h"
+#include <linux/ext2_fs.h>
+
+static int ocfs2_get_inode_attr(struct inode *inode, unsigned *flags)
+{
+        int status;
+
+        status = ocfs2_meta_lock(inode, NULL, NULL, 0);
+        if (status < 0) {
+                mlog_errno(status);
+                return status;
+        }
+        *flags = OCFS2_I(inode)->ip_attr;
+        ocfs2_meta_unlock(inode, 0);
+
+        mlog_exit(status);
+        return status;
+}
+
+static int ocfs2_set_inode_attr(struct inode *inode, unsigned flags,
+                                unsigned mask)
+{
+        struct ocfs2_inode_info *ocfs2_inode = OCFS2_I(inode);
+        struct ocfs2_super *osb = OCFS2_SB(inode->i_sb);
+        struct ocfs2_journal_handle *handle = NULL;
+        struct buffer_head *bh = NULL;
+        unsigned oldflags;
+        int status;
+
+        mutex_lock(&inode->i_mutex);
+
+        status = ocfs2_meta_lock(inode, NULL, &bh, 1);
+        if (status < 0) {
+                mlog_errno(status);
+                goto bail;
+        }
+
+        status = -EROFS;
+        if (IS_RDONLY(inode))
+                goto bail_unlock;
+
+        status = -EACCES;
+        if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
+                goto bail_unlock;
+
+        if (!S_ISDIR(inode->i_mode))
+                flags &= ~OCFS2_DIRSYNC_FL;
+
+        handle = ocfs2_start_trans(osb, NULL, OCFS2_INODE_UPDATE_CREDITS);
+        if (IS_ERR(handle)) {
+                status = PTR_ERR(handle);
+                mlog_errno(status);
+                goto bail_unlock;
+        }
+
+        oldflags = ocfs2_inode->ip_attr;
+        flags = flags & mask;
+        flags |= oldflags & ~mask;
+
+        /*
+         * The IMMUTABLE and APPEND_ONLY flags can only be changed by
+         * the relevant capability.
+         */
+        status = -EPERM;
+        if ((oldflags & OCFS2_IMMUTABLE_FL) || ((flags ^ oldflags) &
+                (OCFS2_APPEND_FL | OCFS2_IMMUTABLE_FL))) {
+                if (!capable(CAP_LINUX_IMMUTABLE))
+                        goto bail_unlock;
+        }
+
+        ocfs2_inode->ip_attr = flags;
+        ocfs2_set_inode_flags(inode);
+
+        status = ocfs2_mark_inode_dirty(handle, inode, bh);
+        if (status < 0)
+                mlog_errno(status);
+
+        ocfs2_commit_trans(handle);
+bail_unlock:
+        ocfs2_meta_unlock(inode, 1);
+bail:
+        mutex_unlock(&inode->i_mutex);
+
+        if (bh)
+                brelse(bh);
+
+        mlog_exit(status);
+        return status;
+}
+
+int ocfs2_ioctl(struct inode * inode, struct file * filp,
+        unsigned int cmd, unsigned long arg)
+{
+        unsigned int flags;
+        int status;
+
+        switch (cmd) {
+        case OCFS2_IOC_GETFLAGS:
+                status = ocfs2_get_inode_attr(inode, &flags);
+                if (status < 0)
+                        return status;
+
+                flags &= OCFS2_FL_VISIBLE;
+                return put_user(flags, (int __user *) arg);
+        case OCFS2_IOC_SETFLAGS:
+                if (get_user(flags, (int __user *) arg))
+                        return -EFAULT;
+
+                return ocfs2_set_inode_attr(inode, flags,
+                        OCFS2_FL_MODIFIABLE);
+        default:
+                return -ENOTTY;
+        }
+}
+