--- /dev/null
+/*
+ * 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>
+
+/*
+ * 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);
+ unsigned int flags;
+ 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, filp);
+ } else
+ err = -ENOTTY;
+ break;
+ /*
+ * following two cases are taken from fs/ext2/ioctl.c by Remy
+ * Card (card@masi.ibp.fr)
+ */
+ case REISERFS_IOC_GETFLAGS:
+ if (!reiserfs_attrs(inode->i_sb)) {
+ err = -ENOTTY;
+ break;
+ }
+
+ flags = REISERFS_I(inode)->i_attrs;
+ i_attrs_to_sd_attrs(inode, (__u16 *) & flags);
+ err = put_user(flags, (int __user *)arg);
+ break;
+ case REISERFS_IOC_SETFLAGS:{
+ if (!reiserfs_attrs(inode->i_sb)) {
+ err = -ENOTTY;
+ break;
+ }
+
+ err = mnt_want_write_file(filp);
+ if (err)
+ break;
+
+ if (!inode_owner_or_capable(inode)) {
+ err = -EPERM;
+ goto setflags_out;
+ }
+ if (get_user(flags, (int __user *)arg)) {
+ err = -EFAULT;
+ goto setflags_out;
+ }
+ /*
+ * Is it quota file? Do not allow user to mess with it
+ */
+ if (IS_NOQUOTA(inode)) {
+ err = -EPERM;
+ goto setflags_out;
+ }
+ if (((flags ^ REISERFS_I(inode)->
+ i_attrs) & (REISERFS_IMMUTABLE_FL |
+ REISERFS_APPEND_FL))
+ && !capable(CAP_LINUX_IMMUTABLE)) {
+ err = -EPERM;
+ goto setflags_out;
+ }
+ if ((flags & REISERFS_NOTAIL_FL) &&
+ S_ISREG(inode->i_mode)) {
+ int result;
+
+ result = reiserfs_unpack(inode, filp);
+ if (result) {
+ err = result;
+ goto setflags_out;
+ }
+ }
+ sd_attrs_to_i_attrs(flags, inode);
+ REISERFS_I(inode)->i_attrs = flags;
+ inode->i_ctime = CURRENT_TIME_SEC;
+ mark_inode_dirty(inode);
+setflags_out:
+ mnt_drop_write_file(filp);
+ break;
+ }
+ case REISERFS_IOC_GETVERSION:
+ err = put_user(inode->i_generation, (int __user *)arg);
+ break;
+ case REISERFS_IOC_SETVERSION:
+ if (!inode_owner_or_capable(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_SEC;
+ 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_GETFLAGS:
+ cmd = REISERFS_IOC_GETFLAGS;
+ break;
+ case REISERFS_IOC32_SETFLAGS:
+ cmd = REISERFS_IOC_SETFLAGS;
+ 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, struct file *filp)
+{
+ 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 */
+ reiserfs_mutex_lock_safe(&inode->i_mutex, inode->i_sb);
+
+ 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_CACHE_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);
+ page_cache_release(page);
+
+out:
+ mutex_unlock(&inode->i_mutex);
+ reiserfs_write_unlock(inode->i_sb);
+ return retval;
+}
Code Review / kvmfornfv.git / blobdiff