152 lines
4.1 KiB
C
152 lines
4.1 KiB
C
/*
|
|
* Copyright 2000 by Hans Reiser, licensing governed by reiserfs/README
|
|
*/
|
|
|
|
#include <linux/fs.h>
|
|
#include <linux/reiserfs_fs.h>
|
|
#include <linux/time.h>
|
|
#include <asm/uaccess.h>
|
|
#include <linux/pagemap.h>
|
|
#include <linux/smp_lock.h>
|
|
|
|
static int reiserfs_unpack (struct inode * inode, struct file * filp);
|
|
|
|
/*
|
|
** 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 to be non-zero)
|
|
** 2) REISERFS_IOC_[GS]ETFLAGS, REISERFS_IOC_[GS]ETVERSION
|
|
** 3) That's all for a while ...
|
|
*/
|
|
int reiserfs_ioctl (struct inode * inode, struct file * filp, unsigned int cmd,
|
|
unsigned long arg)
|
|
{
|
|
unsigned int flags;
|
|
|
|
switch (cmd) {
|
|
case REISERFS_IOC_UNPACK:
|
|
if( S_ISREG( inode -> i_mode ) ) {
|
|
if (arg)
|
|
return reiserfs_unpack (inode, filp);
|
|
else
|
|
return 0;
|
|
} else
|
|
return -ENOTTY;
|
|
/* following two cases are taken from fs/ext2/ioctl.c by Remy
|
|
Card (card@masi.ibp.fr) */
|
|
case REISERFS_IOC_GETFLAGS:
|
|
flags = REISERFS_I(inode) -> i_attrs;
|
|
i_attrs_to_sd_attrs( inode, ( __u16 * ) &flags );
|
|
return put_user(flags, (int __user *) arg);
|
|
case REISERFS_IOC_SETFLAGS: {
|
|
if (IS_RDONLY(inode))
|
|
return -EROFS;
|
|
|
|
if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
|
|
return -EPERM;
|
|
|
|
if (get_user(flags, (int __user *) arg))
|
|
return -EFAULT;
|
|
|
|
if ( ( ( flags ^ REISERFS_I(inode) -> i_attrs) & ( REISERFS_IMMUTABLE_FL | REISERFS_APPEND_FL)) &&
|
|
!capable( CAP_LINUX_IMMUTABLE ) )
|
|
return -EPERM;
|
|
|
|
if( ( flags & REISERFS_NOTAIL_FL ) &&
|
|
S_ISREG( inode -> i_mode ) ) {
|
|
int result;
|
|
|
|
result = reiserfs_unpack( inode, filp );
|
|
if( result )
|
|
return result;
|
|
}
|
|
sd_attrs_to_i_attrs( flags, inode );
|
|
REISERFS_I(inode) -> i_attrs = flags;
|
|
inode->i_ctime = CURRENT_TIME_SEC;
|
|
mark_inode_dirty(inode);
|
|
return 0;
|
|
}
|
|
case REISERFS_IOC_GETVERSION:
|
|
return put_user(inode->i_generation, (int __user *) arg);
|
|
case REISERFS_IOC_SETVERSION:
|
|
if ((current->fsuid != inode->i_uid) && !capable(CAP_FOWNER))
|
|
return -EPERM;
|
|
if (IS_RDONLY(inode))
|
|
return -EROFS;
|
|
if (get_user(inode->i_generation, (int __user *) arg))
|
|
return -EFAULT;
|
|
inode->i_ctime = CURRENT_TIME_SEC;
|
|
mark_inode_dirty(inode);
|
|
return 0;
|
|
default:
|
|
return -ENOTTY;
|
|
}
|
|
}
|
|
|
|
/*
|
|
** reiserfs_unpack
|
|
** Function try to convert tail from direct item into indirect.
|
|
** It set up nopack attribute in the REISERFS_I(inode)->nopack
|
|
*/
|
|
static 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 ;
|
|
}
|
|
reiserfs_write_lock(inode->i_sb);
|
|
|
|
/* we need to make sure nobody is changing the file size beneath
|
|
** us
|
|
*/
|
|
down(&inode->i_sem) ;
|
|
|
|
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_prepare_write 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 = mapping->a_ops->prepare_write(NULL, page, write_from, write_from) ;
|
|
if (retval)
|
|
goto out_unlock ;
|
|
|
|
/* conversion can change page contents, must flush */
|
|
flush_dcache_page(page) ;
|
|
retval = mapping->a_ops->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:
|
|
up(&inode->i_sem) ;
|
|
reiserfs_write_unlock(inode->i_sb);
|
|
return retval;
|
|
}
|