Ejemplo n.º 1
0
int __ext4_journal_forget(const char *where, handle_t *handle,
                struct buffer_head *bh)
{
    int err = jbd2_journal_forget(handle, bh);
    if (err)
        ext4_journal_abort_handle(where, __func__, bh, handle, err);
    return err;
}
Ejemplo n.º 2
0
/*
 * The ext4 forget function must perform a revoke if we are freeing data
 * which has been journaled.  Metadata (eg. indirect blocks) must be
 * revoked in all cases.
 *
 * "bh" may be NULL: a metadata block may have been freed from memory
 * but there may still be a record of it in the journal, and that record
 * still needs to be revoked.
 *
 * If the handle isn't valid we're not journaling, but we still need to
 * call into ext4_journal_revoke() to put the buffer head.
 */
int __ext4_forget(const char *where, unsigned int line, handle_t *handle,
		  int is_metadata, struct inode *inode,
		  struct buffer_head *bh, ext4_fsblk_t blocknr)
{
	int err;

	might_sleep();

	trace_ext4_forget(inode, is_metadata, blocknr);
	BUFFER_TRACE(bh, "enter");

	jbd_debug(4, "forgetting bh %p: is_metadata = %d, mode %o, "
		  "data mode %x\n",
		  bh, is_metadata, inode->i_mode,
		  test_opt(inode->i_sb, DATA_FLAGS));

	/* In the no journal case, we can just do a bforget and return */
	if (!ext4_handle_valid(handle)) {
		bforget(bh);
		return 0;
	}

	/* Never use the revoke function if we are doing full data
	 * journaling: there is no need to, and a V1 superblock won't
	 * support it.  Otherwise, only skip the revoke on un-journaled
	 * data blocks. */

	if (test_opt(inode->i_sb, DATA_FLAGS) == EXT4_MOUNT_JOURNAL_DATA ||
	    (!is_metadata && !ext4_should_journal_data(inode))) {
		if (bh) {
			BUFFER_TRACE(bh, "call jbd2_journal_forget");
			err = jbd2_journal_forget(handle, bh);
			if (err)
				ext4_journal_abort_handle(where, line, __func__,
							  bh, handle, err);
			return err;
		}
		return 0;
	}

	/*
	 * data!=journal && (is_metadata || should_journal_data(inode))
	 */
	BUFFER_TRACE(bh, "call jbd2_journal_revoke");
	err = jbd2_journal_revoke(handle, blocknr, bh);
	if (err) {
		ext4_journal_abort_handle(where, line, __func__,
					  bh, handle, err);
		__ext4_abort(inode->i_sb, where, line,
			   "error %d when attempting revoke", err);
	}
	BUFFER_TRACE(bh, "exit");
	return err;
}
Ejemplo n.º 3
0
int jbd2_journal_revoke(handle_t *handle, unsigned long long blocknr,
		   struct buffer_head *bh_in)
{
	struct buffer_head *bh = NULL;
	journal_t *journal;
	struct block_device *bdev;
	int err;

	might_sleep();
	if (bh_in)
		BUFFER_TRACE(bh_in, "enter");

	journal = handle->h_transaction->t_journal;
	if (!jbd2_journal_set_features(journal, 0, 0, JBD2_FEATURE_INCOMPAT_REVOKE)){
		J_ASSERT (!"Cannot set revoke feature!");
		return -EINVAL;
	}

	bdev = journal->j_fs_dev;
	bh = bh_in;

	if (!bh) {
		bh = __find_get_block(bdev, blocknr, journal->j_blocksize);
		if (bh)
			BUFFER_TRACE(bh, "found on hash");
	}
#ifdef JBD2_EXPENSIVE_CHECKING
	else {
		struct buffer_head *bh2;

		/* If there is a different buffer_head lying around in
		 * memory anywhere... */
		bh2 = __find_get_block(bdev, blocknr, journal->j_blocksize);
		if (bh2) {
			/* ... and it has RevokeValid status... */
			if (bh2 != bh && buffer_revokevalid(bh2))
				/* ...then it better be revoked too,
				 * since it's illegal to create a revoke
				 * record against a buffer_head which is
				 * not marked revoked --- that would
				 * risk missing a subsequent revoke
				 * cancel. */
				J_ASSERT_BH(bh2, buffer_revoked(bh2));
			put_bh(bh2);
		}
	}
#endif

	/* We really ought not ever to revoke twice in a row without
           first having the revoke cancelled: it's illegal to free a
           block twice without allocating it in between! */
	if (bh) {
		if (!J_EXPECT_BH(bh, !buffer_revoked(bh),
				 "inconsistent data on disk")) {
			if (!bh_in)
				brelse(bh);
			return -EIO;
		}
		set_buffer_revoked(bh);
		set_buffer_revokevalid(bh);
		if (bh_in) {
			BUFFER_TRACE(bh_in, "call jbd2_journal_forget");
			jbd2_journal_forget(handle, bh_in);
		} else {
			BUFFER_TRACE(bh, "call brelse");
			__brelse(bh);
		}
	}

	jbd_debug(2, "insert revoke for block %llu, bh_in=%p\n",blocknr, bh_in);
	err = insert_revoke_hash(journal, blocknr,
				handle->h_transaction->t_tid);
	BUFFER_TRACE(bh_in, "exit");
	return err;
}