예제 #1
0
/**
 * ntfs_file_fsync - sync a file to disk
 * @filp:	file to be synced
 * @dentry:	dentry describing the file to sync
 * @datasync:	if non-zero only flush user data and not metadata
 *
 * Data integrity sync of a file to disk.  Used for fsync, fdatasync, and msync
 * system calls.  This function is inspired by fs/buffer.c::file_fsync().
 *
 * If @datasync is false, write the mft record and all associated extent mft
 * records as well as the $DATA attribute and then sync the block device.
 *
 * If @datasync is true and the attribute is non-resident, we skip the writing
 * of the mft record and all associated extent mft records (this might still
 * happen due to the write_inode_now() call).
 *
 * Also, if @datasync is true, we do not wait on the inode to be written out
 * but we always wait on the page cache pages to be written out.
 *
 * Note: In the past @filp could be NULL so we ignore it as we don't need it
 * anyway.
 *
 * Locking: Caller must hold i_sem on the inode.
 *
 * TODO: We should probably also write all attribute/index inodes associated
 * with this inode but since we have no simple way of getting to them we ignore
 * this problem for now.
 */
static int ntfs_file_fsync(struct file *filp, struct dentry *dentry,
		int datasync)
{
	struct inode *vi = dentry->d_inode;
	int err, ret = 0;

	ntfs_debug("Entering for inode 0x%lx.", vi->i_ino);
	BUG_ON(S_ISDIR(vi->i_mode));
	if (!datasync || !NInoNonResident(NTFS_I(vi)))
		ret = ntfs_write_inode(vi, 1);
	write_inode_now(vi, !datasync);
	/*
	 * NOTE: If we were to use mapping->private_list (see ext2 and
	 * fs/buffer.c) for dirty blocks then we could optimize the below to be
	 * sync_mapping_buffers(vi->i_mapping).
	 */
	err = sync_blockdev(vi->i_sb->s_bdev);
	if (unlikely(err && !ret))
		ret = err;
	if (likely(!ret))
		ntfs_debug("Done.");
	else
		ntfs_warning(vi->i_sb, "Failed to f%ssync inode 0x%lx.  Error "
				"%u.", datasync ? "data" : "", vi->i_ino, -ret);
	return ret;
}
static int fat_cont_expand(struct inode *inode, loff_t size)
{
	struct address_space *mapping = inode->i_mapping;
	loff_t start = inode->i_size, count = size - inode->i_size;
	int err;

	err = generic_cont_expand_simple(inode, size);
	if (err)
		goto out;

	inode->i_ctime = inode->i_mtime = CURRENT_TIME_SEC;
	mark_inode_dirty(inode);
	if (IS_SYNC(inode)) {
		int err2;

		/*
		 * Opencode syncing since we don't have a file open to use
		 * standard fsync path.
		 */
		err = filemap_fdatawrite_range(mapping, start,
					       start + count - 1);
		err2 = sync_mapping_buffers(mapping);
		if (!err)
			err = err2;
		err2 = write_inode_now(inode, 1);
		if (!err)
			err = err2;
		if (!err) {
			err =  filemap_fdatawait_range(mapping, start,
						       start + count - 1);
		}
	}
out:
	return err;
}
예제 #3
0
/* Support function for ocfs2_delete_inode. Will help us keep the
 * inode data in a consistent state for clear_inode. Always truncates
 * pages, optionally sync's them first. */
static void ocfs2_cleanup_delete_inode(struct inode *inode,
				       int sync_data)
{
	mlog(0, "Cleanup inode %llu, sync = %d\n",
	     (unsigned long long)OCFS2_I(inode)->ip_blkno, sync_data);
	if (sync_data)
		write_inode_now(inode, 1);
	truncate_inode_pages(&inode->i_data, 0);
}
예제 #4
0
파일: inode.c 프로젝트: AlexShiLucky/linux
/* Called under inode_lock, with no more references on the
 * struct inode, so it's safe here to check the flags field
 * and to manipulate i_nlink without any other locks. */
int ocfs2_drop_inode(struct inode *inode)
{
	struct ocfs2_inode_info *oi = OCFS2_I(inode);

	trace_ocfs2_drop_inode((unsigned long long)oi->ip_blkno,
				inode->i_nlink, oi->ip_flags);

	assert_spin_locked(&inode->i_lock);
	inode->i_state |= I_WILL_FREE;
	spin_unlock(&inode->i_lock);
	write_inode_now(inode, 1);
	spin_lock(&inode->i_lock);
	WARN_ON(inode->i_state & I_NEW);
	inode->i_state &= ~I_WILL_FREE;

	return 1;
}
예제 #5
0
/*
 * Generic function to fsync a file.
 */
int file_fsync(struct file *filp, int datasync)
{
	struct inode *inode = filp->f_mapping->host;
	struct super_block * sb;
	int ret, err;

	/* sync the inode to buffers */
	ret = write_inode_now(inode, 0);

	/* sync the superblock to buffers */
	sb = inode->i_sb;
	if (sb->s_dirt && sb->s_op->write_super)
		sb->s_op->write_super(sb);

	/* .. finally sync the buffers to disk */
	err = sync_blockdev(sb->s_bdev);
	if (!ret)
		ret = err;
	return ret;
}
예제 #6
0
파일: file.c 프로젝트: kzlin129/tt-gpl
/**
 * ntfs_file_fsync - sync a file to disk
 * @filp:	file to be synced
 * @dentry:	dentry describing the file to sync
 * @datasync:	if non-zero only flush user data and not metadata
 *
 * Data integrity sync of a file to disk.  Used for fsync, fdatasync, and msync
 * system calls.  This function is inspired by fs/buffer.c::file_fsync().
 *
 * If @datasync is false, write the mft record and all associated extent mft
 * records as well as the $DATA attribute and then sync the block device.
 *
 * If @datasync is true and the attribute is non-resident, we skip the writing
 * of the mft record and all associated extent mft records (this might still
 * happen due to the write_inode_now() call).
 *
 * Also, if @datasync is true, we do not wait on the inode to be written out
 * but we always wait on the page cache pages to be written out.
 *
 * Note: In the past @filp could be NULL so we ignore it as we don't need it
 * anyway.
 *
 * Locking: Caller must hold i_sem on the inode.
 *
 * TODO: We should probably also write all attribute/index inodes associated
 * with this inode but since we have no simple way of getting to them we ignore
 * this problem for now.
 */
static int ntfs_file_fsync(struct file *filp, struct dentry *dentry,
		int datasync)
{
	struct inode *vi = dentry->d_inode;
	int err, ret = 0;

	ntfs_debug("Entering for inode 0x%lx.", vi->i_ino);
	BUG_ON(S_ISDIR(vi->i_mode));
	if (!datasync || !NInoNonResident(NTFS_I(vi)))
		ret = ntfs_write_inode(vi, 1);
	write_inode_now(vi, !datasync);
	err = sync_blockdev(vi->i_sb->s_bdev);
	if (unlikely(err && !ret))
		ret = err;
	if (likely(!ret))
		ntfs_debug("Done.");
	else
		ntfs_warning(vi->i_sb, "Failed to f%ssync inode 0x%lx.  Error "
				"%u.", datasync ? "data" : "", vi->i_ino, -ret);
	return ret;
}
예제 #7
0
static int gfs2_fsync(struct file *file, struct dentry *dentry, int datasync)
{
	struct inode *inode = dentry->d_inode;
	int sync_state = inode->i_state & (I_DIRTY_SYNC|I_DIRTY_DATASYNC);
	int ret = 0;

	if (gfs2_is_jdata(GFS2_I(inode))) {
		gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl);
		return 0;
	}

	if (sync_state != 0) {
		if (!datasync)
			ret = write_inode_now(inode, 0);

		if (gfs2_is_stuffed(GFS2_I(inode)))
			gfs2_log_flush(GFS2_SB(inode), GFS2_I(inode)->i_gl);
	}

	return ret;
}
예제 #8
0
static int exofs_file_fsync(struct file *filp, int datasync)
{
	int ret;
	struct address_space *mapping = filp->f_mapping;
	struct inode *inode = mapping->host;
	struct super_block *sb;

	ret = filemap_write_and_wait(mapping);
	if (ret)
		return ret;

	/* sync the inode attributes */
	ret = write_inode_now(inode, 1);

	/* This is a good place to write the sb */
	/* TODO: Sechedule an sb-sync on create */
	sb = inode->i_sb;
	if (sb->s_dirt)
		exofs_sync_fs(sb, 1);

	return ret;
}
예제 #9
0
/*
 * Generic function to fsync a file.
 *
 * filp may be NULL if called via the msync of a vma.
 */
int file_fsync(struct file *filp, struct dentry *dentry, int datasync)
{
	struct inode * inode = dentry->d_inode;
	struct super_block * sb;
	int ret, err;

	/* sync the inode to buffers */
	ret = write_inode_now(inode, 0);

	/* sync the superblock to buffers */
	sb = inode->i_sb;
	lock_super(sb);
	if (is_sb_dirty(sb) && sb->s_op->write_super)
		sb->s_op->write_super(sb);
	unlock_super(sb);

	/* .. finally sync the buffers to disk */
	err = sync_blockdev(sb->s_bdev);
	if (!ret)
		ret = err;
	return ret;
}
예제 #10
0
파일: file.c 프로젝트: MohsenKoohi/GSFS
ssize_t GSFS_file_write(struct file *filp, const char __user *buf, size_t len, loff_t *off){
	struct inode		*inode=filp->f_mapping->host;
	struct address_space	*mapping=filp->f_mapping;
	sector_t 		sec_start,
				sec_end,
				sec_len;
	unsigned long 		bufstart,
				bytes_in_first_buf_page,
				bytes_in_last_buf_page,
				pagestartbyte,
				pageendbyte,
				pagelen;
	size_t  		rlen;
	struct page		*res[2],
				*page,
				**pages;
	unsigned int 		i,
				j,
				pages_count,
				start_read,
				end_read;
		
	gwf(printk("<0>" "File write with inode :%lu len:%lu offset:%llu , filepos:%llu, buf:%lx inode_size:%llu, pid:%u\n",inode->i_ino,len,*off,filp->f_pos,(unsigned long)buf,inode->i_size,current->pid));
	if(unlikely(!access_ok(VERIFY_READ,buf,len)))
		return -1;
	
	mutex_lock(&inode->i_mutex);	
	
	if((*off+len)>inode->i_size){
		if((*off+len)>inode->i_sb->s_maxbytes)
			return -1;
		inode->i_size=(*off+len);
		GSFS_truncate(inode);		
	}
	
	if(filp->f_flags & O_APPEND)
		*off=inode->i_size;
	
	current->backing_dev_info=mapping->backing_dev_info;
	file_remove_suid(filp);
	file_update_time(filp);
	//inode_inc_iversion(inode);
	
	sec_start=(*off)>>Block_Size_Bits;
	sec_end=(*off+len-1)>>Block_Size_Bits;
	sec_len=sec_end-sec_start+1;
	
	pages=kzalloc(sizeof(struct page*) * sec_len, GFP_KERNEL);
	
	bytes_in_first_buf_page=Block_Size-((*off)&((unsigned long)Block_Size-1));
	bytes_in_last_buf_page=((*off+len)&((unsigned long)Block_Size-1));
	if(bytes_in_last_buf_page==0)
		bytes_in_last_buf_page=Block_Size;	
	
	start_read=(bytes_in_first_buf_page!=Block_Size)?1:0;
	end_read=(bytes_in_last_buf_page!=Block_Size && inode->i_size>(*off+len))?1:0;

	gwf(printk("<0>" "GSFS write bytes_in_first_buf_page:%lu, bytes_in_last_buf_page:%lu\n",bytes_in_first_buf_page,bytes_in_last_buf_page));
	gwf(printk("<0>" "GSFS write start_read:%u, end_read:%u, sec_start:%lu, sec_end:%lu\n",start_read,end_read,sec_start,sec_end));
	
	if(sec_start==sec_end){
		if(start_read || end_read){
			res[0]=GSFS_get_data_page_of_inode_with_read(inode, sec_start);
			gwf(printk("<0>" "sec_start==sec_end, start_read || end_read , res[0]=%lx",(unsigned long)res[0]));
		}
		else{
			res[0]=GSFS_get_locked_data_page_of_inode_without_read(inode,sec_start);
			if(likely(res[0]))
				unlock_page(res[0]);
			gwf(printk("<0>" "sec_start==sec_end, !(start_read || end_read) , res[0]=%lx",(unsigned long)res[0]));
		}
		res[1]=0;
		if(unlikely(!res[0])){
			gwf(printk("<0>" "GSFS write len:-1\n"));
			mutex_unlock(&inode->i_mutex);
			printk("<1>" "GSFS write len:-1\n");
			
			kfree(pages);
			
			return len;
		}
	}
	else{
		if(start_read){
			res[0]=GSFS_get_data_page_of_inode_with_read(inode, sec_start);
			gwf(printk("<0>" "sec_start!=sec_end, start_read, res[0]=%lx",(unsigned long)res[0]));
		}
		else{
			res[0]=GSFS_get_locked_data_page_of_inode_without_read(inode,sec_start);
			if(likely(res[0]))
				unlock_page(res[0]);
			gwf(printk("<0>" "sec_start!=sec_end, !start_read, res[0]=%lx",(unsigned long)res[0]));
		}
	}
	
	pages_count=0;
	if(sec_len>1)
		for(i=sec_start+1;i<=sec_end-1;i++)
			pages[pages_count++]=GSFS_get_locked_data_page_of_inode_without_read(inode,i);
	
	if(sec_start != sec_end){
		if(end_read){
			res[1]=GSFS_get_data_page_of_inode_with_read(inode,sec_end);
			gwf(printk("<0>" "sec_start!=sec_end, end_read, res[1]=%lx",(unsigned long)res[1]));
		}
		else{
			res[1]=GSFS_get_locked_data_page_of_inode_without_read(inode,sec_end);
			if(likely(res[1]))
				unlock_page(res[1]);
			gwf(printk("<0>" "sec_start!=sec_end, !end_read, res[1]=%lx",(unsigned long)res[1]));
		}
		
		if(unlikely(!res[0] || !res[1])){
			gwf(printk("<0>" "GSFS write len:-1\n"));
			printk("<1>" "GSFS write len:-1\n");
			mutex_unlock(&inode->i_mutex);
			
			kfree(pages);
			
			return len;
		}
	}
	
	rlen=0;
	bufstart=(unsigned long)buf+bytes_in_first_buf_page;
	pagelen=Block_Size;
	
	//100% expected complete pages that should be copied
	pages_count=0;
	if(sec_len>1)
		for(i=sec_start+1;i<=sec_end-1;i++){
			gwf(printk("<0>" "write page complete pages, i:%u, bufstart:%lx, rlen=%lu\n",i,bufstart,rlen));
			
			page=pages[pages_count++];
			if(unlikely(!page))
				goto buf_cont;
			
			j=__copy_from_user_inatomic(page_address(page),(void*)bufstart,pagelen);
			
			rlen+=(Block_Size-j);
			
			mark_page_accessed(page);
			set_page_dirty(page);
			put_page(page);
			
			unlock_page(page);
buf_cont:			
			bufstart+=pagelen;		
		}
	
	//first and last page that are not surely complete
	for(i=0;i<2 && res[i];i++){		
		page=res[i];
		wait_on_page_locked(page);
		lock_page(page);
		if(page->index==sec_start){
			bufstart=(unsigned long)buf;
			pagestartbyte=Block_Size-bytes_in_first_buf_page;
			if(sec_start==sec_end)
				pageendbyte=pagestartbyte+len-1;
			else
				pageendbyte=Block_Size-1;
		}
		else{
			bufstart=(unsigned long)buf+bytes_in_first_buf_page+((sec_len-2)<<Block_Size_Bits);
			pageendbyte=bytes_in_last_buf_page-1;
			pagestartbyte=0;
		}
		gwf(printk("<0>" "gsfs_write for first and last page, i=%u, page:%lx, bufstart:%lx, pagestartbyte:%lu, pageendbyte:%lu\n",
				i,(unsigned long)page,bufstart,pagestartbyte,pageendbyte));
		pagelen=pageendbyte-pagestartbyte+1;
		j=__copy_from_user_inatomic(page_address(page)+pagestartbyte,(void*)bufstart,pagelen);
		rlen+=(pagelen-j);		
		mark_page_accessed(page);
		set_page_dirty(page);
		put_page(page);
		unlock_page(page);		
	}
	
	mutex_unlock(&inode->i_mutex);
	(*off)+=rlen;
	
	gwf(printk("<0>" "GSFS write rlen:%lu\n",rlen));
	
	kfree(pages);
	
	if(filp->f_flags & O_SYNC){
		write_inode_now(inode,1);
	}
	
	return rlen;
}
예제 #11
0
/*
 * Set various file attributes.
 * N.B. After this call fhp needs an fh_put
 */
__be32
nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap,
	     int check_guard, time_t guardtime)
{
	struct dentry	*dentry;
	struct inode	*inode;
	int		accmode = NFSD_MAY_SATTR;
	int		ftype = 0;
	__be32		err;
	int		host_err;
	int		size_change = 0;

	if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_SIZE))
		accmode |= NFSD_MAY_WRITE|NFSD_MAY_OWNER_OVERRIDE;
	if (iap->ia_valid & ATTR_SIZE)
		ftype = S_IFREG;

	/* Get inode */
	err = fh_verify(rqstp, fhp, ftype, accmode);
	if (err)
		goto out;

	dentry = fhp->fh_dentry;
	inode = dentry->d_inode;

	/* Ignore any mode updates on symlinks */
	if (S_ISLNK(inode->i_mode))
		iap->ia_valid &= ~ATTR_MODE;

	if (!iap->ia_valid)
		goto out;

	/*
	 * NFSv2 does not differentiate between "set-[ac]time-to-now"
	 * which only requires access, and "set-[ac]time-to-X" which
	 * requires ownership.
	 * So if it looks like it might be "set both to the same time which
	 * is close to now", and if inode_change_ok fails, then we
	 * convert to "set to now" instead of "set to explicit time"
	 *
	 * We only call inode_change_ok as the last test as technically
	 * it is not an interface that we should be using.  It is only
	 * valid if the filesystem does not define it's own i_op->setattr.
	 */
#define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET)
#define	MAX_TOUCH_TIME_ERROR (30*60)
	if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET &&
	    iap->ia_mtime.tv_sec == iap->ia_atime.tv_sec) {
		/*
		 * Looks probable.
		 *
		 * Now just make sure time is in the right ballpark.
		 * Solaris, at least, doesn't seem to care what the time
		 * request is.  We require it be within 30 minutes of now.
		 */
		time_t delta = iap->ia_atime.tv_sec - get_seconds();
		if (delta < 0)
			delta = -delta;
		if (delta < MAX_TOUCH_TIME_ERROR &&
		    inode_change_ok(inode, iap) != 0) {
			/*
			 * Turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME.
			 * This will cause notify_change to set these times
			 * to "now"
			 */
			iap->ia_valid &= ~BOTH_TIME_SET;
		}
	}
	    
	/*
	 * The size case is special.
	 * It changes the file as well as the attributes.
	 */
	if (iap->ia_valid & ATTR_SIZE) {
		if (iap->ia_size < inode->i_size) {
			err = nfsd_permission(rqstp, fhp->fh_export, dentry,
					NFSD_MAY_TRUNC|NFSD_MAY_OWNER_OVERRIDE);
			if (err)
				goto out;
		}

		/*
		 * If we are changing the size of the file, then
		 * we need to break all leases.
		 */
		host_err = break_lease(inode, FMODE_WRITE | O_NONBLOCK);
		if (host_err == -EWOULDBLOCK)
			host_err = -ETIMEDOUT;
		if (host_err) /* ENOMEM or EWOULDBLOCK */
			goto out_nfserr;

		host_err = get_write_access(inode);
		if (host_err)
			goto out_nfserr;

		size_change = 1;
		host_err = locks_verify_truncate(inode, NULL, iap->ia_size);
		if (host_err) {
			put_write_access(inode);
			goto out_nfserr;
		}
		DQUOT_INIT(inode);
	}

	/* sanitize the mode change */
	if (iap->ia_valid & ATTR_MODE) {
		iap->ia_mode &= S_IALLUGO;
		iap->ia_mode |= (inode->i_mode & ~S_IALLUGO);
	}

	/* Revoke setuid/setgid on chown */
	if (((iap->ia_valid & ATTR_UID) && iap->ia_uid != inode->i_uid) ||
	    ((iap->ia_valid & ATTR_GID) && iap->ia_gid != inode->i_gid)) {
		iap->ia_valid |= ATTR_KILL_PRIV;
		if (iap->ia_valid & ATTR_MODE) {
			/* we're setting mode too, just clear the s*id bits */
			iap->ia_mode &= ~S_ISUID;
			if (iap->ia_mode & S_IXGRP)
				iap->ia_mode &= ~S_ISGID;
		} else {
			/* set ATTR_KILL_* bits and let VFS handle it */
			iap->ia_valid |= (ATTR_KILL_SUID | ATTR_KILL_SGID);
		}
	}

	/* Change the attributes. */

	iap->ia_valid |= ATTR_CTIME;

	err = nfserr_notsync;
	if (!check_guard || guardtime == inode->i_ctime.tv_sec) {
		fh_lock(fhp);
		host_err = notify_change(dentry, iap);
		err = nfserrno(host_err);
		fh_unlock(fhp);
	}
	if (size_change)
		put_write_access(inode);
	if (!err)
		if (EX_ISSYNC(fhp->fh_export))
			write_inode_now(inode, 1);
out:
	return err;

out_nfserr:
	err = nfserrno(host_err);
	goto out;
}
예제 #12
0
파일: ioctl.c 프로젝트: CSCLOG/beaglebone
static int setflags(struct inode *inode, int flags)
{
	int oldflags, err, release;
	struct ubifs_inode *ui = ubifs_inode(inode);
	struct ubifs_info *c = inode->i_sb->s_fs_info;
	struct ubifs_budget_req req = { .dirtied_ino = 1,
					.dirtied_ino_d = ui->data_len };

	err = ubifs_budget_space(c, &req);
	if (err)
		return err;

	/*
	 * The IMMUTABLE and APPEND_ONLY flags can only be changed by
	 * the relevant capability.
	 */
	mutex_lock(&ui->ui_mutex);
	oldflags = ubifs2ioctl(ui->flags);
	if ((flags ^ oldflags) & (FS_APPEND_FL | FS_IMMUTABLE_FL)) {
		if (!capable(CAP_LINUX_IMMUTABLE)) {
			err = -EPERM;
			goto out_unlock;
		}
	}

	ui->flags = ioctl2ubifs(flags);
	ubifs_set_inode_flags(inode);
	inode->i_ctime = ubifs_current_time(inode);
	release = ui->dirty;
	mark_inode_dirty_sync(inode);
	mutex_unlock(&ui->ui_mutex);

	if (release)
		ubifs_release_budget(c, &req);
	if (IS_SYNC(inode))
		err = write_inode_now(inode, 1);
	return err;

out_unlock:
	ubifs_err("can't modify inode %lu attributes", inode->i_ino);
	mutex_unlock(&ui->ui_mutex);
	ubifs_release_budget(c, &req);
	return err;
}

long ubifs_ioctl(struct file *file, unsigned int cmd, unsigned long arg)
{
	int flags, err;
	struct inode *inode = file->f_path.dentry->d_inode;

	switch (cmd) {
	case FS_IOC_GETFLAGS:
		flags = ubifs2ioctl(ubifs_inode(inode)->flags);

		dbg_gen("get flags: %#x, i_flags %#x", flags, inode->i_flags);
		return put_user(flags, (int __user *) arg);

	case FS_IOC_SETFLAGS: {
		if (IS_RDONLY(inode))
			return -EROFS;

		if (!inode_owner_or_capable(inode))
			return -EACCES;

		if (get_user(flags, (int __user *) arg))
			return -EFAULT;

		if (!S_ISDIR(inode->i_mode))
			flags &= ~FS_DIRSYNC_FL;

		/*
		 * Make sure the file-system is read-write and make sure it
		 * will not become read-only while we are changing the flags.
		 */
		err = mnt_want_write(file->f_path.mnt);
		if (err)
			return err;
		dbg_gen("set flags: %#x, i_flags %#x", flags, inode->i_flags);
		err = setflags(inode, flags);
		mnt_drop_write(file->f_path.mnt);
		return err;
	}

	default:
		return -ENOTTY;
	}
}
예제 #13
0
파일: vfs.c 프로젝트: niubl/camera_project
/*
 * Set various file attributes.
 * N.B. After this call fhp needs an fh_put
 */
int
nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap,
	     int check_guard, time_t guardtime)
{
	struct dentry	*dentry;
	struct inode	*inode;
	int		accmode = MAY_SATTR;
	int		ftype = 0;
	int		imode;
	int		err;
	int		size_change = 0;

	if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_SIZE))
		accmode |= MAY_WRITE|MAY_OWNER_OVERRIDE;
	if (iap->ia_valid & ATTR_SIZE)
		ftype = S_IFREG;

	/* Get inode */
	err = fh_verify(rqstp, fhp, ftype, accmode);
	if (err || !iap->ia_valid)
		goto out;

	dentry = fhp->fh_dentry;
	inode = dentry->d_inode;

	/* NFSv2 does not differentiate between "set-[ac]time-to-now"
	 * which only requires access, and "set-[ac]time-to-X" which
	 * requires ownership.
	 * So if it looks like it might be "set both to the same time which
	 * is close to now", and if inode_change_ok fails, then we
	 * convert to "set to now" instead of "set to explicit time"
	 *
	 * We only call inode_change_ok as the last test as technically
	 * it is not an interface that we should be using.  It is only
	 * valid if the filesystem does not define it's own i_op->setattr.
	 */
#define BOTH_TIME_SET (ATTR_ATIME_SET | ATTR_MTIME_SET)
#define	MAX_TOUCH_TIME_ERROR (30*60)
	if ((iap->ia_valid & BOTH_TIME_SET) == BOTH_TIME_SET
	    && iap->ia_mtime == iap->ia_atime
	    ) {
	    /* Looks probable.  Now just make sure time is in the right ballpark.
	     * Solaris, at least, doesn't seem to care what the time request is.
	     * We require it be within 30 minutes of now.
	     */
	    time_t delta = iap->ia_atime - CURRENT_TIME;
	    if (delta<0) delta = -delta;
	    if (delta < MAX_TOUCH_TIME_ERROR &&
		inode_change_ok(inode, iap) != 0) {
		/* turn off ATTR_[AM]TIME_SET but leave ATTR_[AM]TIME
		 * this will cause notify_change to set these times to "now"
		 */
		iap->ia_valid &= ~BOTH_TIME_SET;
	    }
	}
	    
	/* The size case is special. It changes the file as well as the attributes.  */
	if (iap->ia_valid & ATTR_SIZE) {
		if (iap->ia_size < inode->i_size) {
			err = nfsd_permission(fhp->fh_export, dentry, MAY_TRUNC|MAY_OWNER_OVERRIDE);
			if (err)
				goto out;
		}

		/*
		 * If we are changing the size of the file, then
		 * we need to break all leases.
		 */
		err = get_lease(inode, FMODE_WRITE);
		if (err)
			goto out_nfserr;

		err = get_write_access(inode);
		if (err)
			goto out_nfserr;

		err = locks_verify_truncate(inode, NULL, iap->ia_size);
		if (err) {
			put_write_access(inode);
			goto out_nfserr;
		}
		DQUOT_INIT(inode);
	}

	imode = inode->i_mode;
	if (iap->ia_valid & ATTR_MODE) {
		iap->ia_mode &= S_IALLUGO;
		imode = iap->ia_mode |= (imode & ~S_IALLUGO);
	}

	/* Revoke setuid/setgid bit on chown/chgrp */
	if ((iap->ia_valid & ATTR_UID) && (imode & S_ISUID)
	 && iap->ia_uid != inode->i_uid) {
		iap->ia_valid |= ATTR_MODE;
		iap->ia_mode = imode &= ~S_ISUID;
	}
	if ((iap->ia_valid & ATTR_GID) && (imode & S_ISGID)
	 && iap->ia_gid != inode->i_gid) {
		iap->ia_valid |= ATTR_MODE;
		iap->ia_mode = imode &= ~S_ISGID;
	}

	/* Change the attributes. */


	iap->ia_valid |= ATTR_CTIME;

	if (iap->ia_valid & ATTR_SIZE) {
		fh_lock(fhp);
		size_change = 1;
	}
	err = nfserr_notsync;
	if (!check_guard || guardtime == inode->i_ctime) {
		err = notify_change(dentry, iap);
		err = nfserrno(err);
	}
	if (size_change) {
		fh_unlock(fhp);
		put_write_access(inode);
	}
	if (!err)
		if (EX_ISSYNC(fhp->fh_export))
			write_inode_now(inode, 1);
out:
	return err;

out_nfserr:
	err = nfserrno(err);
	goto out;
}
예제 #14
0
/*
 * Rename a file
 * N.B. After this call _both_ ffhp and tfhp need an fh_put
 */
int
nfsd_rename(struct svc_rqst *rqstp, struct svc_fh *ffhp, char *fname, int flen,
			    struct svc_fh *tfhp, char *tname, int tlen)
{
	struct dentry	*fdentry, *tdentry, *odentry, *ndentry;
	struct inode	*fdir, *tdir;
	int		err;

	err = fh_verify(rqstp, ffhp, S_IFDIR, MAY_REMOVE);
	if (err)
		goto out;
	err = fh_verify(rqstp, tfhp, S_IFDIR, MAY_CREATE);
	if (err)
		goto out;

	fdentry = ffhp->fh_dentry;
	fdir = fdentry->d_inode;

	tdentry = tfhp->fh_dentry;
	tdir = tdentry->d_inode;

	/* N.B. We shouldn't need this ... dentry layer handles it */
	err = nfserr_perm;
	if (!flen || (fname[0] == '.' && 
	    (flen == 1 || (flen == 2 && fname[1] == '.'))) ||
	    !tlen || (tname[0] == '.' && 
	    (tlen == 1 || (tlen == 2 && tname[1] == '.'))))
		goto out;

	odentry = lookup_dentry(fname, dget(fdentry), 0);
	err = PTR_ERR(odentry);
	if (IS_ERR(odentry))
		goto out_nfserr;

	err = -ENOENT;
	if (!odentry->d_inode)
		goto out_dput_old;

	ndentry = lookup_dentry(tname, dget(tdentry), 0);
	err = PTR_ERR(ndentry);
	if (IS_ERR(ndentry))
		goto out_dput_old;

	/*
	 * Lock the parent directories.
	 */
	nfsd_double_down(&tdir->i_sem, &fdir->i_sem);
	err = -ENOENT;
	/* GAM3 check for parent changes after locking. */
	if (check_parent(fdir, odentry) &&
	    check_parent(tdir, ndentry)) {

		err = vfs_rename(fdir, odentry, tdir, ndentry);
		if (!err && EX_ISSYNC(tfhp->fh_export)) {
			write_inode_now(fdir);
			write_inode_now(tdir);
		}
	} else
		dprintk("nfsd: Caught race in nfsd_rename");
	DQUOT_DROP(fdir);
	DQUOT_DROP(tdir);

	nfsd_double_up(&tdir->i_sem, &fdir->i_sem);
	dput(ndentry);

out_dput_old:
	dput(odentry);
	if (err)
		goto out_nfserr;
out:
	return err;

out_nfserr:
	err = nfserrno(-err);
	goto out;
}
예제 #15
0
/*
 * Unlink a file or directory
 * N.B. After this call fhp needs an fh_put
 */
int
nfsd_unlink(struct svc_rqst *rqstp, struct svc_fh *fhp, int type,
				char *fname, int flen)
{
	struct dentry	*dentry, *rdentry;
	struct inode	*dirp;
	int		err;

	/* N.B. We shouldn't need this test ... handled by dentry layer */
	err = nfserr_acces;
	if (!flen || isdotent(fname, flen))
		goto out;
	err = fh_verify(rqstp, fhp, S_IFDIR, MAY_REMOVE);
	if (err)
		goto out;

	dentry = fhp->fh_dentry;
	dirp = dentry->d_inode;

	rdentry = lookup_dentry(fname, dget(dentry), 0);
	err = PTR_ERR(rdentry);
	if (IS_ERR(rdentry))
		goto out_nfserr;

	if (!rdentry->d_inode) {
		dput(rdentry);
		err = nfserr_noent;
		goto out;
	}

	if (type != S_IFDIR) {
		/* It's UNLINK */
		err = fh_lock_parent(fhp, rdentry);
		if (err)
			goto out;

		err = vfs_unlink(dirp, rdentry);

		DQUOT_DROP(dirp);
		fh_unlock(fhp);

		dput(rdentry);

	} else {
		/* It's RMDIR */
		/* See comments in fs/namei.c:do_rmdir */
		rdentry->d_count++;
		nfsd_double_down(&dirp->i_sem, &rdentry->d_inode->i_sem);
		if (!fhp->fh_pre_mtime)
			fhp->fh_pre_mtime = dirp->i_mtime;
		fhp->fh_locked = 1;

		err = -ENOENT;
		if (check_parent(dirp, rdentry))
			err = vfs_rmdir(dirp, rdentry);

		rdentry->d_count--;
		DQUOT_DROP(dirp);
		if (!fhp->fh_post_version)
			fhp->fh_post_version = dirp->i_version;
		fhp->fh_locked = 0;
		nfsd_double_up(&dirp->i_sem, &rdentry->d_inode->i_sem);

		dput(rdentry);
	}

	if (err)
		goto out_nfserr;
	if (EX_ISSYNC(fhp->fh_export))
		write_inode_now(dirp);
out:
	return err;

out_nfserr:
	err = nfserrno(-err);
	goto out;
}
예제 #16
0
/*
 * Set various file attributes.
 * N.B. After this call fhp needs an fh_put
 */
int
nfsd_setattr(struct svc_rqst *rqstp, struct svc_fh *fhp, struct iattr *iap)
{
	struct dentry	*dentry;
	struct inode	*inode;
	int		accmode = MAY_SATTR;
	int		ftype = 0;
	int		imode;
	int		err;

	if (iap->ia_valid & (ATTR_ATIME | ATTR_MTIME | ATTR_SIZE))
		accmode |= MAY_WRITE;
	if (iap->ia_valid & ATTR_SIZE)
		ftype = S_IFREG;

	/* Get inode */
	err = fh_verify(rqstp, fhp, ftype, accmode);
	if (err)
		goto out;

	dentry = fhp->fh_dentry;
	inode = dentry->d_inode;

	err = inode_change_ok(inode, iap);
	if (err)
		goto out_nfserr;

	/* The size case is special... */
	if (iap->ia_valid & ATTR_SIZE) {
if (!S_ISREG(inode->i_mode))
printk("nfsd_setattr: size change??\n");
		if (iap->ia_size < inode->i_size) {
			err = nfsd_permission(fhp->fh_export, dentry, MAY_TRUNC);
			if (err)
				goto out;
		}
		err = get_write_access(inode);
		if (err)
			goto out_nfserr;
		/* N.B. Should we update the inode cache here? */
		inode->i_size = iap->ia_size;
		if (inode->i_op && inode->i_op->truncate)
			inode->i_op->truncate(inode);
		mark_inode_dirty(inode);
		put_write_access(inode);
		iap->ia_valid &= ~ATTR_SIZE;
		iap->ia_valid |= ATTR_MTIME;
		iap->ia_mtime = CURRENT_TIME;
	}

	imode = inode->i_mode;
	if (iap->ia_valid & ATTR_MODE) {
		iap->ia_mode &= S_IALLUGO;
		imode = iap->ia_mode |= (imode & ~S_IALLUGO);
	}

	/* Revoke setuid/setgid bit on chown/chgrp */
	if ((iap->ia_valid & ATTR_UID) && (imode & S_ISUID)
	 && iap->ia_uid != inode->i_uid) {
		iap->ia_valid |= ATTR_MODE;
		iap->ia_mode = imode &= ~S_ISUID;
	}
	if ((iap->ia_valid & ATTR_GID) && (imode & S_ISGID)
	 && iap->ia_gid != inode->i_gid) {
		iap->ia_valid |= ATTR_MODE;
		iap->ia_mode = imode &= ~S_ISGID;
	}

	/* Change the attributes. */
	if (iap->ia_valid) {
		kernel_cap_t	saved_cap = 0;

		iap->ia_valid |= ATTR_CTIME;
		iap->ia_ctime = CURRENT_TIME;
		if (current->fsuid != 0) {
			saved_cap = current->cap_effective;
			cap_clear(current->cap_effective);
		}
		err = notify_change(dentry, iap);
		if (current->fsuid != 0)
			current->cap_effective = saved_cap;
		if (err)
			goto out_nfserr;
		if (EX_ISSYNC(fhp->fh_export))
			write_inode_now(inode);
	}
	err = 0;
out:
	return err;

out_nfserr:
	err = nfserrno(-err);
	goto out;
}
예제 #17
0
/*
 * Create a hardlink
 * N.B. After this call _both_ ffhp and tfhp need an fh_put
 */
int
nfsd_link(struct svc_rqst *rqstp, struct svc_fh *ffhp,
				char *fname, int len, struct svc_fh *tfhp)
{
	struct dentry	*ddir, *dnew, *dold;
	struct inode	*dirp, *dest;
	int		err;

	err = fh_verify(rqstp, ffhp, S_IFDIR, MAY_CREATE);
	if (err)
		goto out;
	err = fh_verify(rqstp, tfhp, S_IFREG, MAY_NOP);
	if (err)
		goto out;

	err = nfserr_perm;
	if (!len)
		goto out;

	ddir = ffhp->fh_dentry;
	dirp = ddir->d_inode;

	dnew = lookup_dentry(fname, dget(ddir), 0);
	err = PTR_ERR(dnew);
	if (IS_ERR(dnew))
		goto out_nfserr;
	/*
	 * Lock the parent before checking for existence
	 */
	err = fh_lock_parent(ffhp, dnew);
	if (err)
		goto out_dput;

	err = nfserr_exist;
	if (dnew->d_inode)
		goto out_unlock;

	dold = tfhp->fh_dentry;
	dest = dold->d_inode;

	err = nfserr_acces;
	if (nfsd_iscovered(ddir, ffhp->fh_export))
		goto out_unlock;
	/* FIXME: nxdev for NFSv3 */
	if (dirp->i_dev != dest->i_dev)
		goto out_unlock;

	err = nfserr_perm;
	if (IS_IMMUTABLE(dest) /* || IS_APPEND(dest) */ )
		goto out_unlock;
	if (!dirp->i_op || !dirp->i_op->link)
		goto out_unlock;

	DQUOT_INIT(dirp);
	err = dirp->i_op->link(dold, dirp, dnew);
	DQUOT_DROP(dirp);
	if (!err) {
		if (EX_ISSYNC(ffhp->fh_export)) {
			write_inode_now(dirp);
			write_inode_now(dest);
		}
	} else
		err = nfserrno(-err);

out_unlock:
	fh_unlock(ffhp);
out_dput:
	dput(dnew);
out:
	return err;

out_nfserr:
	err = nfserrno(-err);
	goto out;
}
예제 #18
0
/*
 * Create a symlink and look up its inode
 * N.B. After this call _both_ fhp and resfhp need an fh_put
 */
int
nfsd_symlink(struct svc_rqst *rqstp, struct svc_fh *fhp,
				char *fname, int flen,
				char *path,  int plen,
				struct svc_fh *resfhp)
{
	struct dentry	*dentry, *dnew;
	struct inode	*dirp;
	int		err;

	err = nfserr_noent;
	if (!flen || !plen)
		goto out;

	err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE);
	if (err)
		goto out;
	dentry = fhp->fh_dentry;

	err = nfserr_perm;
	if (nfsd_iscovered(dentry, fhp->fh_export))
		goto out;
	dirp = dentry->d_inode;
	if (!dirp->i_op	|| !dirp->i_op->symlink)
		goto out;

	dnew = lookup_dentry(fname, dget(dentry), 0);
	err = PTR_ERR(dnew);
	if (IS_ERR(dnew))
		goto out_nfserr;

	/*
	 * Lock the parent before checking for existence
	 */
	err = fh_lock_parent(fhp, dnew);
	if (err)
		goto out_compose;

	err = nfserr_exist;
	if (!dnew->d_inode) {
		DQUOT_INIT(dirp);
		err = dirp->i_op->symlink(dirp, dnew, path);
		DQUOT_DROP(dirp);
		if (!err) {
			if (EX_ISSYNC(fhp->fh_export))
				write_inode_now(dirp);
		} else
			err = nfserrno(-err);
	}
	fh_unlock(fhp);

	/* Compose the fh so the dentry will be freed ... */
out_compose:
	fh_compose(resfhp, fhp->fh_export, dnew);
out:
	return err;

out_nfserr:
	err = nfserrno(-err);
	goto out;
}
예제 #19
0
/*
 * Create a file (regular, directory, device, fifo); UNIX sockets 
 * not yet implemented.
 * If the response fh has been verified, the parent directory should
 * already be locked. Note that the parent directory is left locked.
 *
 * N.B. Every call to nfsd_create needs an fh_put for _both_ fhp and resfhp
 */
int
nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
		char *fname, int flen, struct iattr *iap,
		int type, dev_t rdev, struct svc_fh *resfhp)
{
	struct dentry	*dentry, *dchild;
	struct inode	*dirp;
	nfsd_dirop_t	opfunc = NULL;
	int		err;

	err = nfserr_perm;
	if (!flen)
		goto out;
	err = fh_verify(rqstp, fhp, S_IFDIR, MAY_CREATE);
	if (err)
		goto out;

	dentry = fhp->fh_dentry;
	dirp = dentry->d_inode;

	err = nfserr_notdir;
	if(!dirp->i_op || !dirp->i_op->lookup)
		goto out;
	/*
	 * Check whether the response file handle has been verified yet.
	 * If it has, the parent directory should already be locked.
	 */
	if (!resfhp->fh_dverified) {
		dchild = lookup_dentry(fname, dget(dentry), 0);
		err = PTR_ERR(dchild);
		if (IS_ERR(dchild))
			goto out_nfserr;
		fh_compose(resfhp, fhp->fh_export, dchild);
		/* Lock the parent and check for errors ... */
		err = fh_lock_parent(fhp, dchild);
		if (err)
			goto out;
	} else {
		dchild = resfhp->fh_dentry;
		if (!fhp->fh_locked)
			printk(KERN_ERR
				"nfsd_create: parent %s/%s not locked!\n",
				dentry->d_parent->d_name.name,
				dentry->d_name.name);
	}
	/*
	 * Make sure the child dentry is still negative ...
	 */
	err = nfserr_exist;
	if (dchild->d_inode) {
		printk(KERN_WARNING
			"nfsd_create: dentry %s/%s not negative!\n",
			dentry->d_name.name, dchild->d_name.name);
		goto out; 
	}

	/*
	 * Get the dir op function pointer.
	 */
	err = nfserr_perm;
	switch (type) {
	case S_IFREG:
		opfunc = (nfsd_dirop_t) dirp->i_op->create;
		break;
	case S_IFDIR:
		opfunc = (nfsd_dirop_t) dirp->i_op->mkdir;
		break;
	case S_IFCHR:
	case S_IFBLK:
		/* The client is _NOT_ required to do security enforcement */
		if(!capable(CAP_SYS_ADMIN))
		{
			err = -EPERM;
			goto out;
		}
	case S_IFIFO:
	case S_IFSOCK:
		opfunc = dirp->i_op->mknod;
		break;
	}
	if (!opfunc)
		goto out;

	if (!(iap->ia_valid & ATTR_MODE))
		iap->ia_mode = 0;

	/*
	 * Call the dir op function to create the object.
	 */
	DQUOT_INIT(dirp);
	err = opfunc(dirp, dchild, iap->ia_mode, rdev);
	DQUOT_DROP(dirp);
	if (err < 0)
		goto out_nfserr;

	if (EX_ISSYNC(fhp->fh_export))
		write_inode_now(dirp);

	/*
	 * Update the file handle to get the new inode info.
	 */
	fh_update(resfhp);

	/* Set file attributes. Mode has already been set and
	 * setting uid/gid works only for root. Irix appears to
	 * send along the gid when it tries to implement setgid
	 * directories via NFS.
	 */
	err = 0;
	if ((iap->ia_valid &= (ATTR_UID|ATTR_GID|ATTR_MODE)) != 0)
		err = nfsd_setattr(rqstp, resfhp, iap);
out:
	return err;

out_nfserr:
	err = nfserrno(-err);
	goto out;
}
예제 #20
0
/*
 * Write data to a file.
 * The stable flag requests synchronous writes.
 * N.B. After this call fhp needs an fh_put
 */
int
nfsd_write(struct svc_rqst *rqstp, struct svc_fh *fhp, loff_t offset,
				char *buf, unsigned long cnt, int stable)
{
	struct svc_export	*exp;
	struct file		file;
	struct dentry		*dentry;
	struct inode		*inode;
	mm_segment_t		oldfs;
	int			err = 0;
#ifdef CONFIG_QUOTA
	uid_t			saved_euid;
#endif

	if (!cnt)
		goto out;
	err = nfsd_open(rqstp, fhp, S_IFREG, OPEN_WRITE, &file);
	if (err)
		goto out;
	err = nfserr_perm;
	if (!file.f_op->write)
		goto out_close;

	dentry = file.f_dentry;
	inode = dentry->d_inode;
	exp   = fhp->fh_export;

	/*
	 * Request sync writes if
	 *  -	the sync export option has been set, or
	 *  -	the client requested O_SYNC behavior (NFSv3 feature).
	 * When gathered writes have been configured for this volume,
	 * flushing the data to disk is handled separately below.
	 */
	if ((stable || (stable = EX_ISSYNC(exp))) && !EX_WGATHER(exp))
		file.f_flags |= O_SYNC;

	fh_lock(fhp);			/* lock inode */
	file.f_pos = offset;		/* set write offset */

	/* Write the data. */
	oldfs = get_fs(); set_fs(KERNEL_DS);
#ifdef CONFIG_QUOTA
	/* This is for disk quota. */
	saved_euid = current->euid;
	current->euid = current->fsuid;
	err = file.f_op->write(&file, buf, cnt, &file.f_pos);
	current->euid = saved_euid;
#else
	err = file.f_op->write(&file, buf, cnt, &file.f_pos);
#endif
	set_fs(oldfs);

	/* clear setuid/setgid flag after write */
	if (err >= 0 && (inode->i_mode & (S_ISUID | S_ISGID))) {
		struct iattr	ia;
		kernel_cap_t	saved_cap;

		ia.ia_valid = ATTR_MODE;
		ia.ia_mode  = inode->i_mode & ~(S_ISUID | S_ISGID);
		if (current->fsuid != 0) {
			saved_cap = current->cap_effective;
			cap_clear(current->cap_effective);
		}
		notify_change(dentry, &ia);
		if (current->fsuid != 0)
			current->cap_effective = saved_cap;
	}

	fh_unlock(fhp);			/* unlock inode */

	if (err >= 0 && stable) {
		static unsigned long	last_ino = 0;
		static kdev_t		last_dev = NODEV;

		/*
		 * Gathered writes: If another process is currently
		 * writing to the file, there's a high chance
		 * this is another nfsd (triggered by a bulk write
		 * from a client's biod). Rather than syncing the
		 * file with each write request, we sleep for 10 msec.
		 *
		 * I don't know if this roughly approximates
		 * C. Juszak's idea of gathered writes, but it's a
		 * nice and simple solution (IMHO), and it seems to
		 * work:-)
		 */
		if (EX_WGATHER(exp) && (inode->i_writecount > 1
		 || (last_ino == inode->i_ino && last_dev == inode->i_dev))) {
#if 0
			interruptible_sleep_on_timeout(&inode->i_wait, 10 * HZ / 1000);
#else
			dprintk("nfsd: write defer %d\n", current->pid);
			schedule_timeout((HZ+99)/100);
			dprintk("nfsd: write resume %d\n", current->pid);
#endif
		}

		if (inode->i_state & I_DIRTY) {
			dprintk("nfsd: write sync %d\n", current->pid);
			nfsd_sync(inode, &file);
			write_inode_now(inode);
		}
		wake_up(&inode->i_wait);
		last_ino = inode->i_ino;
		last_dev = inode->i_dev;
	}

	dprintk("nfsd: write complete\n");
	if (err >= 0)
		err = 0;
	else 
		err = nfserrno(-err);
out_close:
	nfsd_close(&file);
out:
	return err;
}