Adding upstream version 6.1.76.upstream/6.1.76

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 221 insertions, 0 deletions

diff --git a/fs/reiserfs/ioctl.c b/fs/reiserfs/ioctl.c
new file mode 100644
index 000000000..4b86ecf58
--- /dev/null
+++ b/fs/reiserfs/ioctl.c
@@ -0,0 +1,221 @@
+/*
+ * Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
+ */
+
+#include <linux/capability.h>
+#include <linux/fs.h>
+#include <linux/mount.h>
+#include "reiserfs.h"
+#include <linux/time.h>
+#include <linux/uaccess.h>
+#include <linux/pagemap.h>
+#include <linux/compat.h>
+#include <linux/fileattr.h>
+
+int reiserfs_fileattr_get(struct dentry *dentry, struct fileattr *fa)
+{
+	struct inode *inode = d_inode(dentry);
+
+	if (!reiserfs_attrs(inode->i_sb))
+		return -ENOTTY;
+
+	fileattr_fill_flags(fa, REISERFS_I(inode)->i_attrs);
+
+	return 0;
+}
+
+int reiserfs_fileattr_set(struct user_namespace *mnt_userns,
+			  struct dentry *dentry, struct fileattr *fa)
+{
+	struct inode *inode = d_inode(dentry);
+	unsigned int flags = fa->flags;
+	int err;
+
+	reiserfs_write_lock(inode->i_sb);
+
+	err = -ENOTTY;
+	if (!reiserfs_attrs(inode->i_sb))
+		goto unlock;
+
+	err = -EOPNOTSUPP;
+	if (fileattr_has_fsx(fa))
+		goto unlock;
+
+	/*
+	 * Is it quota file? Do not allow user to mess with it
+	 */
+	err = -EPERM;
+	if (IS_NOQUOTA(inode))
+		goto unlock;
+
+	if ((flags & REISERFS_NOTAIL_FL) && S_ISREG(inode->i_mode)) {
+		err = reiserfs_unpack(inode);
+		if (err)
+			goto unlock;
+	}
+	sd_attrs_to_i_attrs(flags, inode);
+	REISERFS_I(inode)->i_attrs = flags;
+	inode->i_ctime = current_time(inode);
+	mark_inode_dirty(inode);
+	err = 0;
+unlock:
+	reiserfs_write_unlock(inode->i_sb);
+
+	return err;
+}
+
+/*
+ * reiserfs_ioctl - handler for ioctl for inode
+ * supported commands:
+ *  1) REISERFS_IOC_UNPACK - try to unpack tail from direct item into indirect
+ *                           and prevent packing file (argument arg has t
+ *			      be non-zero)
+ *  2) REISERFS_IOC_[GS]ETFLAGS, REISERFS_IOC_[GS]ETVERSION
+ *  3) That's all for a while ...
+ */
+long reiserfs_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
+{
+	struct inode *inode = file_inode(filp);
+	int err = 0;
+
+	reiserfs_write_lock(inode->i_sb);
+
+	switch (cmd) {
+	case REISERFS_IOC_UNPACK:
+		if (S_ISREG(inode->i_mode)) {
+			if (arg)
+				err = reiserfs_unpack(inode);
+		} else
+			err = -ENOTTY;
+		break;
+		/*
+		 * following two cases are taken from fs/ext2/ioctl.c by Remy
+		 * Card (card@masi.ibp.fr)
+		 */
+	case REISERFS_IOC_GETVERSION:
+		err = put_user(inode->i_generation, (int __user *)arg);
+		break;
+	case REISERFS_IOC_SETVERSION:
+		if (!inode_owner_or_capable(&init_user_ns, inode)) {
+			err = -EPERM;
+			break;
+		}
+		err = mnt_want_write_file(filp);
+		if (err)
+			break;
+		if (get_user(inode->i_generation, (int __user *)arg)) {
+			err = -EFAULT;
+			goto setversion_out;
+		}
+		inode->i_ctime = current_time(inode);
+		mark_inode_dirty(inode);
+setversion_out:
+		mnt_drop_write_file(filp);
+		break;
+	default:
+		err = -ENOTTY;
+	}
+
+	reiserfs_write_unlock(inode->i_sb);
+
+	return err;
+}
+
+#ifdef CONFIG_COMPAT
+long reiserfs_compat_ioctl(struct file *file, unsigned int cmd,
+				unsigned long arg)
+{
+	/*
+	 * These are just misnamed, they actually
+	 * get/put from/to user an int
+	 */
+	switch (cmd) {
+	case REISERFS_IOC32_UNPACK:
+		cmd = REISERFS_IOC_UNPACK;
+		break;
+	case REISERFS_IOC32_GETVERSION:
+		cmd = REISERFS_IOC_GETVERSION;
+		break;
+	case REISERFS_IOC32_SETVERSION:
+		cmd = REISERFS_IOC_SETVERSION;
+		break;
+	default:
+		return -ENOIOCTLCMD;
+	}
+
+	return reiserfs_ioctl(file, cmd, (unsigned long) compat_ptr(arg));
+}
+#endif
+
+int reiserfs_commit_write(struct file *f, struct page *page,
+			  unsigned from, unsigned to);
+/*
+ * reiserfs_unpack
+ * Function try to convert tail from direct item into indirect.
+ * It set up nopack attribute in the REISERFS_I(inode)->nopack
+ */
+int reiserfs_unpack(struct inode *inode)
+{
+	int retval = 0;
+	int index;
+	struct page *page;
+	struct address_space *mapping;
+	unsigned long write_from;
+	unsigned long blocksize = inode->i_sb->s_blocksize;
+
+	if (inode->i_size == 0) {
+		REISERFS_I(inode)->i_flags |= i_nopack_mask;
+		return 0;
+	}
+	/* ioctl already done */
+	if (REISERFS_I(inode)->i_flags & i_nopack_mask) {
+		return 0;
+	}
+
+	/* we need to make sure nobody is changing the file size beneath us */
+	{
+		int depth = reiserfs_write_unlock_nested(inode->i_sb);
+
+		inode_lock(inode);
+		reiserfs_write_lock_nested(inode->i_sb, depth);
+	}
+
+	reiserfs_write_lock(inode->i_sb);
+
+	write_from = inode->i_size & (blocksize - 1);
+	/* if we are on a block boundary, we are already unpacked.  */
+	if (write_from == 0) {
+		REISERFS_I(inode)->i_flags |= i_nopack_mask;
+		goto out;
+	}
+
+	/*
+	 * we unpack by finding the page with the tail, and calling
+	 * __reiserfs_write_begin on that page.  This will force a
+	 * reiserfs_get_block to unpack the tail for us.
+	 */
+	index = inode->i_size >> PAGE_SHIFT;
+	mapping = inode->i_mapping;
+	page = grab_cache_page(mapping, index);
+	retval = -ENOMEM;
+	if (!page) {
+		goto out;
+	}
+	retval = __reiserfs_write_begin(page, write_from, 0);
+	if (retval)
+		goto out_unlock;
+
+	/* conversion can change page contents, must flush */
+	flush_dcache_page(page);
+	retval = reiserfs_commit_write(NULL, page, write_from, write_from);
+	REISERFS_I(inode)->i_flags |= i_nopack_mask;
+
+out_unlock:
+	unlock_page(page);
+	put_page(page);
+
+out:
+	inode_unlock(inode);
+	reiserfs_write_unlock(inode->i_sb);
+	return retval;
+}