/*
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/*
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* Copyright 2000-2002 by Hans Reiser, licensing governed by reiserfs/README
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* Copyright 2000-2002 by Hans Reiser, licensing governed by reiserfs/README
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*/
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*/
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#include <linux/fs.h>
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#include <linux/fs.h>
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#include <linux/reiserfs_fs.h>
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#include <linux/reiserfs_fs.h>
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#include <linux/sched.h>
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#include <linux/sched.h>
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#include <asm/uaccess.h>
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#include <asm/uaccess.h>
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#include <linux/smp_lock.h>
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#include <linux/smp_lock.h>
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#include <linux/locks.h>
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#include <linux/locks.h>
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/*
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/*
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** reiserfs_ioctl - handler for ioctl for inode
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** reiserfs_ioctl - handler for ioctl for inode
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** supported commands:
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** supported commands:
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** 1) REISERFS_IOC_UNPACK - try to unpack tail from direct item into indirect
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** 1) REISERFS_IOC_UNPACK - try to unpack tail from direct item into indirect
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** and prevent packing file (argument arg has to be non-zero)
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** and prevent packing file (argument arg has to be non-zero)
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** 2) REISERFS_IOC_[GS]ETFLAGS, REISERFS_IOC_[GS]ETVERSION
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** 2) REISERFS_IOC_[GS]ETFLAGS, REISERFS_IOC_[GS]ETVERSION
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** 3) That's all for a while ...
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** 3) That's all for a while ...
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*/
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*/
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int reiserfs_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
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int reiserfs_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
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unsigned long arg)
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unsigned long arg)
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{
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{
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unsigned int flags;
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unsigned int flags;
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switch (cmd) {
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switch (cmd) {
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case REISERFS_IOC_UNPACK:
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case REISERFS_IOC_UNPACK:
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if( S_ISREG( inode -> i_mode ) ) {
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if( S_ISREG( inode -> i_mode ) ) {
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if (arg)
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if (arg)
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return reiserfs_unpack (inode, filp);
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return reiserfs_unpack (inode, filp);
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else
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else
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return 0;
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return 0;
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} else
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} else
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return -ENOTTY;
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return -ENOTTY;
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/*
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/*
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* Following {G,S}ETFLAGS, and {G,S}ETVERSION are providing ext2
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* Following {G,S}ETFLAGS, and {G,S}ETVERSION are providing ext2
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* binary compatible interface (used by lsattr(1), and chattr(1)) and
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* binary compatible interface (used by lsattr(1), and chattr(1)) and
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* are * thus conceptually similar to appropriate pieces of
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* are * thus conceptually similar to appropriate pieces of
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* fs/ext2/ioctl.c
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* fs/ext2/ioctl.c
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*/
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*/
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case REISERFS_IOC_GETFLAGS:
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case REISERFS_IOC_GETFLAGS:
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flags = inode -> u.reiserfs_i.i_attrs;
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flags = inode -> u.reiserfs_i.i_attrs;
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i_attrs_to_sd_attrs( inode, ( __u16 * ) &flags );
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i_attrs_to_sd_attrs( inode, ( __u16 * ) &flags );
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return put_user(flags, (int *) arg);
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return put_user(flags, (int *) arg);
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case REISERFS_IOC_SETFLAGS: {
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case REISERFS_IOC_SETFLAGS: {
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if (IS_RDONLY(inode))
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if (IS_RDONLY(inode))
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return -EROFS;
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return -EROFS;
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if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
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if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
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return -EPERM;
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return -EPERM;
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if (get_user(flags, (int *) arg))
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if (get_user(flags, (int *) arg))
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return -EFAULT;
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return -EFAULT;
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if ( ( ( flags ^ inode->u.reiserfs_i.i_attrs) & ( REISERFS_IMMUTABLE_FL | REISERFS_APPEND_FL)) &&
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if ( ( ( flags ^ inode->u.reiserfs_i.i_attrs) & ( REISERFS_IMMUTABLE_FL | REISERFS_APPEND_FL)) &&
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!capable( CAP_LINUX_IMMUTABLE ) )
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!capable( CAP_LINUX_IMMUTABLE ) )
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return -EPERM;
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return -EPERM;
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if( ( flags & REISERFS_NOTAIL_FL ) &&
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if( ( flags & REISERFS_NOTAIL_FL ) &&
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S_ISREG( inode -> i_mode ) ) {
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S_ISREG( inode -> i_mode ) ) {
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int result;
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int result;
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result = reiserfs_unpack( inode, filp );
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result = reiserfs_unpack( inode, filp );
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if( result )
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if( result )
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return result;
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return result;
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}
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}
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sd_attrs_to_i_attrs( flags, inode );
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sd_attrs_to_i_attrs( flags, inode );
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inode -> u.reiserfs_i.i_attrs = flags;
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inode -> u.reiserfs_i.i_attrs = flags;
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inode->i_ctime = CURRENT_TIME;
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inode->i_ctime = CURRENT_TIME;
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mark_inode_dirty(inode);
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mark_inode_dirty(inode);
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return 0;
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return 0;
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}
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}
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case REISERFS_IOC_GETVERSION:
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case REISERFS_IOC_GETVERSION:
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return put_user(inode->i_generation, (int *) arg);
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return put_user(inode->i_generation, (int *) arg);
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case REISERFS_IOC_SETVERSION:
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case REISERFS_IOC_SETVERSION:
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if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
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if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
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return -EPERM;
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return -EPERM;
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if (IS_RDONLY(inode))
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if (IS_RDONLY(inode))
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return -EROFS;
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return -EROFS;
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if (get_user(inode->i_generation, (int *) arg))
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if (get_user(inode->i_generation, (int *) arg))
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return -EFAULT;
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return -EFAULT;
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inode->i_ctime = CURRENT_TIME;
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inode->i_ctime = CURRENT_TIME;
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mark_inode_dirty(inode);
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mark_inode_dirty(inode);
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return 0;
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return 0;
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default:
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default:
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return -ENOTTY;
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return -ENOTTY;
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}
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}
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return 0;
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return 0;
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}
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}
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/*
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/*
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** reiserfs_unpack
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** reiserfs_unpack
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** Function try to convert tail from direct item into indirect.
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** Function try to convert tail from direct item into indirect.
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** It set up nopack attribute in the inode.u.reiserfs_i.nopack
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** It set up nopack attribute in the inode.u.reiserfs_i.nopack
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*/
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*/
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int reiserfs_unpack (struct inode * inode, struct file * filp)
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int reiserfs_unpack (struct inode * inode, struct file * filp)
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{
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{
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int retval = 0;
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int retval = 0;
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int index ;
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int index ;
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struct page *page ;
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struct page *page ;
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unsigned long write_from ;
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unsigned long write_from ;
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unsigned long blocksize = inode->i_sb->s_blocksize ;
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unsigned long blocksize = inode->i_sb->s_blocksize ;
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if (inode->i_size == 0) {
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if (inode->i_size == 0) {
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inode->u.reiserfs_i.i_flags |= i_nopack_mask;
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inode->u.reiserfs_i.i_flags |= i_nopack_mask;
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return 0 ;
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return 0 ;
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}
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}
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/* ioctl already done */
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/* ioctl already done */
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if (inode->u.reiserfs_i.i_flags & i_nopack_mask) {
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if (inode->u.reiserfs_i.i_flags & i_nopack_mask) {
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return 0 ;
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return 0 ;
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}
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}
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lock_kernel();
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lock_kernel();
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/* we need to make sure nobody is changing the file size beneath
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/* we need to make sure nobody is changing the file size beneath
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** us
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** us
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*/
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*/
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down(&inode->i_sem) ;
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down(&inode->i_sem) ;
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write_from = inode->i_size & (blocksize - 1) ;
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write_from = inode->i_size & (blocksize - 1) ;
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/* if we are on a block boundary, we are already unpacked. */
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/* if we are on a block boundary, we are already unpacked. */
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if ( write_from == 0) {
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if ( write_from == 0) {
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inode->u.reiserfs_i.i_flags |= i_nopack_mask;
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inode->u.reiserfs_i.i_flags |= i_nopack_mask;
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goto out ;
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goto out ;
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}
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}
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/* we unpack by finding the page with the tail, and calling
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/* we unpack by finding the page with the tail, and calling
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** reiserfs_prepare_write on that page. This will force a
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** reiserfs_prepare_write on that page. This will force a
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** reiserfs_get_block to unpack the tail for us.
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** reiserfs_get_block to unpack the tail for us.
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*/
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*/
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index = inode->i_size >> PAGE_CACHE_SHIFT ;
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index = inode->i_size >> PAGE_CACHE_SHIFT ;
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page = grab_cache_page(inode->i_mapping, index) ;
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page = grab_cache_page(inode->i_mapping, index) ;
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retval = -ENOMEM;
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retval = -ENOMEM;
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if (!page) {
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if (!page) {
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goto out ;
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goto out ;
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}
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}
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retval = reiserfs_prepare_write(NULL, page, write_from, blocksize) ;
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retval = reiserfs_prepare_write(NULL, page, write_from, blocksize) ;
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if (retval)
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if (retval)
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goto out_unlock ;
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goto out_unlock ;
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/* conversion can change page contents, must flush */
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/* conversion can change page contents, must flush */
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flush_dcache_page(page) ;
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flush_dcache_page(page) ;
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inode->u.reiserfs_i.i_flags |= i_nopack_mask;
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inode->u.reiserfs_i.i_flags |= i_nopack_mask;
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kunmap(page) ; /* mapped by prepare_write */
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kunmap(page) ; /* mapped by prepare_write */
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out_unlock:
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out_unlock:
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UnlockPage(page) ;
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UnlockPage(page) ;
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page_cache_release(page) ;
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page_cache_release(page) ;
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out:
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out:
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up(&inode->i_sem) ;
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up(&inode->i_sem) ;
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unlock_kernel();
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unlock_kernel();
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return retval;
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return retval;
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}
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}
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