Exemple #1
0
/*
 * Look up a filename in a int directory.
 * Use an internal routine to actually do all the work.
 */
STATIC int
xfs_dir_node_lookup(xfs_da_args_t *args)
{
	xfs_da_state_t *state;
	int retval, error, i;

	state = xfs_da_state_alloc();
	state->args = args;
	state->mp = args->dp->i_mount;
	state->blocksize = state->mp->m_sb.sb_blocksize;

	/*
	 * Search to see if name exists,
	 * and get back a pointer to it.
	 */
	error = xfs_da_node_lookup_int(state, &retval);
	if (error) {
		retval = error;
	}

	/* 
	 * If not in a transaction, we have to release all the buffers.
	 */
	for (i = 0; i < state->path.active; i++) {
		xfs_da_brelse(args->trans, state->path.blk[i].bp);
		state->path.blk[i].bp = NULL;
	}

	xfs_da_state_free(state);
	return(retval);
}
Exemple #2
0
/*
 * Remove a name from a B-tree directory.
 *
 * This will involve walking down the Btree, and may involve joining
 * leaf nodes and even joining intermediate nodes up to and including
 * the root node (a special case of an intermediate node).
 */
STATIC int
xfs_dir_node_removename(xfs_da_args_t *args)
{
	xfs_da_state_t *state;
	xfs_da_state_blk_t *blk;
	int retval, error;

	state = xfs_da_state_alloc();
	state->args = args;
	state->mp = args->dp->i_mount;
	state->blocksize = state->mp->m_sb.sb_blocksize;

	/*
	 * Search to see if name exists, and get back a pointer to it.
	 */
	error = xfs_da_node_lookup_int(state, &retval);
	if (error)
		retval = error;
	if (retval != EEXIST) {
		xfs_da_state_free(state);
		return(retval);
	}

	/*
	 * Remove the name and update the hashvals in the tree.
	 */
	blk = &state->path.blk[ state->path.active-1 ];
	ASSERT(blk->magic == XFS_DIR_LEAF_MAGIC);
	retval = xfs_dir_leaf_remove(args->trans, blk->bp, blk->index);
	xfs_da_fixhashpath(state, &state->path);

	/*
	 * Check to see if the tree needs to be collapsed.
	 */
	error = 0;
	if (retval) {
		error = xfs_da_join(state);
	}

	xfs_da_state_free(state);
	if (error)
		return(error);
	return(0);
}
Exemple #3
0
/*
 * Look up a filename in an int directory, replace the inode number.
 * Use an internal routine to actually do the lookup.
 */
STATIC int
xfs_dir_node_replace(xfs_da_args_t *args)
{
	xfs_da_state_t *state;
	xfs_da_state_blk_t *blk;
	xfs_dir_leafblock_t *leaf;
	xfs_dir_leaf_entry_t *entry;
	xfs_dir_leaf_name_t *namest;
	xfs_ino_t inum;
	int retval, error, i;
	xfs_dabuf_t *bp;

	state = xfs_da_state_alloc();
	state->args = args;
	state->mp = args->dp->i_mount;
	state->blocksize = state->mp->m_sb.sb_blocksize;
	inum = args->inumber;

	/*
	 * Search to see if name exists,
	 * and get back a pointer to it.
	 */
	error = xfs_da_node_lookup_int(state, &retval);
	if (error) {
		retval = error;
	}

	if (retval == EEXIST) {
		blk = &state->path.blk[state->path.active - 1];
		ASSERT(blk->magic == XFS_DIR_LEAF_MAGIC);
		bp = blk->bp;
		leaf = bp->data;
		entry = &leaf->entries[blk->index];
		namest = XFS_DIR_LEAF_NAMESTRUCT(leaf, INT_GET(entry->nameidx, ARCH_CONVERT));
                /* XXX - replace assert ? */
		XFS_DIR_SF_PUT_DIRINO_ARCH(&inum, &namest->inumber, ARCH_CONVERT);
		xfs_da_log_buf(args->trans, bp,
		    XFS_DA_LOGRANGE(leaf, namest, sizeof(namest->inumber)));
		xfs_da_buf_done(bp);
		blk->bp = NULL;
		retval = 0;
	} else {
		i = state->path.active - 1;
		xfs_da_brelse(args->trans, state->path.blk[i].bp);
		state->path.blk[i].bp = NULL;
	}
	for (i = 0; i < state->path.active - 1; i++) {
		xfs_da_brelse(args->trans, state->path.blk[i].bp);
		state->path.blk[i].bp = NULL;
	}

	xfs_da_state_free(state);
	return(retval);
}
Exemple #4
0
/*
 * Add a name to a Btree-format directory.
 *
 * This will involve walking down the Btree, and may involve splitting
 * leaf nodes and even splitting intermediate nodes up to and including
 * the root node (a special case of an intermediate node).
 */
STATIC int
xfs_dir_node_addname(xfs_da_args_t *args)
{
	xfs_da_state_t *state;
	xfs_da_state_blk_t *blk;
	int retval, error;

	/*
	 * Fill in bucket of arguments/results/context to carry around.
	 */
	state = xfs_da_state_alloc();
	state->args = args;
	state->mp = args->dp->i_mount;
	state->blocksize = state->mp->m_sb.sb_blocksize;

	/*
	 * Search to see if name already exists, and get back a pointer
	 * to where it should go.
	 */
	error = xfs_da_node_lookup_int(state, &retval);
	if (error)
		retval = error;
	if (retval != ENOENT)
		goto error;
	blk = &state->path.blk[ state->path.active-1 ];
	ASSERT(blk->magic == XFS_DIR_LEAF_MAGIC);
	retval = xfs_dir_leaf_add(blk->bp, args, blk->index);
	if (retval == 0) {
		/*
		 * Addition succeeded, update Btree hashvals.
		 */
		if (!args->justcheck)
			xfs_da_fixhashpath(state, &state->path);
	} else {
		/*
		 * Addition failed, split as many Btree elements as required.
		 */
		if (args->total == 0) {
			ASSERT(retval == ENOSPC);
			goto error;
		}
		retval = xfs_da_split(state);
	}
error:
	xfs_da_state_free(state);

	return(retval);
}
Exemple #5
0
/*
 * Look up a filename in a node attribute list.
 *
 * This routine gets called for any attribute fork that has more than one
 * block, ie: both true Btree attr lists and for single-leaf-blocks with
 * "remote" values taking up more blocks.
 */
STATIC int
xfs_attr_node_get(xfs_da_args_t *args)
{
	xfs_da_state_t *state;
	xfs_da_state_blk_t *blk;
	int error, retval;
	int i;

	trace_xfs_attr_node_get(args);

	state = xfs_da_state_alloc();
	state->args = args;
	state->mp = args->dp->i_mount;

	/*
	 * Search to see if name exists, and get back a pointer to it.
	 */
	error = xfs_da3_node_lookup_int(state, &retval);
	if (error) {
		retval = error;
	} else if (retval == -EEXIST) {
		blk = &state->path.blk[ state->path.active-1 ];
		ASSERT(blk->bp != NULL);
		ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);

		/*
		 * Get the value, local or "remote"
		 */
		retval = xfs_attr3_leaf_getvalue(blk->bp, args);
		if (!retval && (args->rmtblkno > 0)
		    && !(args->flags & ATTR_KERNOVAL)) {
			retval = xfs_attr_rmtval_get(args);
		}
	}

	/*
	 * If not in a transaction, we have to release all the buffers.
	 */
	for (i = 0; i < state->path.active; i++) {
		xfs_trans_brelse(args->trans, state->path.blk[i].bp);
		state->path.blk[i].bp = NULL;
	}

	xfs_da_state_free(state);
	return retval;
}
Exemple #6
0
/*
 * Add a name to a Btree-format attribute list.
 *
 * This will involve walking down the Btree, and may involve splitting
 * leaf nodes and even splitting intermediate nodes up to and including
 * the root node (a special case of an intermediate node).
 *
 * "Remote" attribute values confuse the issue and atomic rename operations
 * add a whole extra layer of confusion on top of that.
 */
STATIC int
xfs_attr_node_addname(
	struct xfs_da_args	*args)
{
	struct xfs_da_state	*state;
	struct xfs_da_state_blk	*blk;
	struct xfs_inode	*dp;
	struct xfs_mount	*mp;
	int			retval, error;

	trace_xfs_attr_node_addname(args);

	/*
	 * Fill in bucket of arguments/results/context to carry around.
	 */
	dp = args->dp;
	mp = dp->i_mount;
restart:
	state = xfs_da_state_alloc();
	state->args = args;
	state->mp = mp;

	/*
	 * Search to see if name already exists, and get back a pointer
	 * to where it should go.
	 */
	error = xfs_da3_node_lookup_int(state, &retval);
	if (error)
		goto out;
	blk = &state->path.blk[ state->path.active-1 ];
	ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
	if ((args->flags & ATTR_REPLACE) && (retval == -ENOATTR)) {
		goto out;
	} else if (retval == -EEXIST) {
		if (args->flags & ATTR_CREATE)
			goto out;

		trace_xfs_attr_node_replace(args);

		/* save the attribute state for later removal*/
		args->op_flags |= XFS_DA_OP_RENAME;	/* atomic rename op */
		args->blkno2 = args->blkno;		/* set 2nd entry info*/
		args->index2 = args->index;
		args->rmtblkno2 = args->rmtblkno;
		args->rmtblkcnt2 = args->rmtblkcnt;
		args->rmtvaluelen2 = args->rmtvaluelen;

		/*
		 * clear the remote attr state now that it is saved so that the
		 * values reflect the state of the attribute we are about to
		 * add, not the attribute we just found and will remove later.
		 */
		args->rmtblkno = 0;
		args->rmtblkcnt = 0;
		args->rmtvaluelen = 0;
	}

	retval = xfs_attr3_leaf_add(blk->bp, state->args);
	if (retval == -ENOSPC) {
		if (state->path.active == 1) {
			/*
			 * Its really a single leaf node, but it had
			 * out-of-line values so it looked like it *might*
			 * have been a b-tree.
			 */
			xfs_da_state_free(state);
			state = NULL;
			error = xfs_attr3_leaf_to_node(args);
			if (error)
				goto out;
			error = xfs_defer_finish(&args->trans);
			if (error)
				goto out;

			/*
			 * Commit the node conversion and start the next
			 * trans in the chain.
			 */
			error = xfs_trans_roll_inode(&args->trans, dp);
			if (error)
				goto out;

			goto restart;
		}

		/*
		 * Split as many Btree elements as required.
		 * This code tracks the new and old attr's location
		 * in the index/blkno/rmtblkno/rmtblkcnt fields and
		 * in the index2/blkno2/rmtblkno2/rmtblkcnt2 fields.
		 */
		error = xfs_da3_split(state);
		if (error)
			goto out;
		error = xfs_defer_finish(&args->trans);
		if (error)
			goto out;
	} else {
		/*
		 * Addition succeeded, update Btree hashvals.
		 */
		xfs_da3_fixhashpath(state, &state->path);
	}

	/*
	 * Kill the state structure, we're done with it and need to
	 * allow the buffers to come back later.
	 */
	xfs_da_state_free(state);
	state = NULL;

	/*
	 * Commit the leaf addition or btree split and start the next
	 * trans in the chain.
	 */
	error = xfs_trans_roll_inode(&args->trans, dp);
	if (error)
		goto out;

	/*
	 * If there was an out-of-line value, allocate the blocks we
	 * identified for its storage and copy the value.  This is done
	 * after we create the attribute so that we don't overflow the
	 * maximum size of a transaction and/or hit a deadlock.
	 */
	if (args->rmtblkno > 0) {
		error = xfs_attr_rmtval_set(args);
		if (error)
			return error;
	}

	/*
	 * If this is an atomic rename operation, we must "flip" the
	 * incomplete flags on the "new" and "old" attribute/value pairs
	 * so that one disappears and one appears atomically.  Then we
	 * must remove the "old" attribute/value pair.
	 */
	if (args->op_flags & XFS_DA_OP_RENAME) {
		/*
		 * In a separate transaction, set the incomplete flag on the
		 * "old" attr and clear the incomplete flag on the "new" attr.
		 */
		error = xfs_attr3_leaf_flipflags(args);
		if (error)
			goto out;

		/*
		 * Dismantle the "old" attribute/value pair by removing
		 * a "remote" value (if it exists).
		 */
		args->index = args->index2;
		args->blkno = args->blkno2;
		args->rmtblkno = args->rmtblkno2;
		args->rmtblkcnt = args->rmtblkcnt2;
		args->rmtvaluelen = args->rmtvaluelen2;
		if (args->rmtblkno) {
			error = xfs_attr_rmtval_remove(args);
			if (error)
				return error;
		}

		/*
		 * Re-find the "old" attribute entry after any split ops.
		 * The INCOMPLETE flag means that we will find the "old"
		 * attr, not the "new" one.
		 */
		args->flags |= XFS_ATTR_INCOMPLETE;
		state = xfs_da_state_alloc();
		state->args = args;
		state->mp = mp;
		state->inleaf = 0;
		error = xfs_da3_node_lookup_int(state, &retval);
		if (error)
			goto out;

		/*
		 * Remove the name and update the hashvals in the tree.
		 */
		blk = &state->path.blk[ state->path.active-1 ];
		ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
		error = xfs_attr3_leaf_remove(blk->bp, args);
		xfs_da3_fixhashpath(state, &state->path);

		/*
		 * Check to see if the tree needs to be collapsed.
		 */
		if (retval && (state->path.active > 1)) {
			error = xfs_da3_join(state);
			if (error)
				goto out;
			error = xfs_defer_finish(&args->trans);
			if (error)
				goto out;
		}

		/*
		 * Commit and start the next trans in the chain.
		 */
		error = xfs_trans_roll_inode(&args->trans, dp);
		if (error)
			goto out;

	} else if (args->rmtblkno > 0) {
		/*
		 * Added a "remote" value, just clear the incomplete flag.
		 */
		error = xfs_attr3_leaf_clearflag(args);
		if (error)
			goto out;
	}
	retval = error = 0;

out:
	if (state)
		xfs_da_state_free(state);
	if (error)
		return error;
	return retval;
}
Exemple #7
0
/*
 * Remove a name from a B-tree attribute list.
 *
 * This will involve walking down the Btree, and may involve joining
 * leaf nodes and even joining intermediate nodes up to and including
 * the root node (a special case of an intermediate node).
 */
STATIC int
xfs_attr_node_removename(
	struct xfs_da_args	*args)
{
	struct xfs_da_state	*state;
	struct xfs_da_state_blk	*blk;
	struct xfs_inode	*dp;
	struct xfs_buf		*bp;
	int			retval, error, forkoff;

	trace_xfs_attr_node_removename(args);

	/*
	 * Tie a string around our finger to remind us where we are.
	 */
	dp = args->dp;
	state = xfs_da_state_alloc();
	state->args = args;
	state->mp = dp->i_mount;

	/*
	 * Search to see if name exists, and get back a pointer to it.
	 */
	error = xfs_da3_node_lookup_int(state, &retval);
	if (error || (retval != -EEXIST)) {
		if (error == 0)
			error = retval;
		goto out;
	}

	/*
	 * If there is an out-of-line value, de-allocate the blocks.
	 * This is done before we remove the attribute so that we don't
	 * overflow the maximum size of a transaction and/or hit a deadlock.
	 */
	blk = &state->path.blk[ state->path.active-1 ];
	ASSERT(blk->bp != NULL);
	ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
	if (args->rmtblkno > 0) {
		/*
		 * Fill in disk block numbers in the state structure
		 * so that we can get the buffers back after we commit
		 * several transactions in the following calls.
		 */
		error = xfs_attr_fillstate(state);
		if (error)
			goto out;

		/*
		 * Mark the attribute as INCOMPLETE, then bunmapi() the
		 * remote value.
		 */
		error = xfs_attr3_leaf_setflag(args);
		if (error)
			goto out;
		error = xfs_attr_rmtval_remove(args);
		if (error)
			goto out;

		/*
		 * Refill the state structure with buffers, the prior calls
		 * released our buffers.
		 */
		error = xfs_attr_refillstate(state);
		if (error)
			goto out;
	}

	/*
	 * Remove the name and update the hashvals in the tree.
	 */
	blk = &state->path.blk[ state->path.active-1 ];
	ASSERT(blk->magic == XFS_ATTR_LEAF_MAGIC);
	retval = xfs_attr3_leaf_remove(blk->bp, args);
	xfs_da3_fixhashpath(state, &state->path);

	/*
	 * Check to see if the tree needs to be collapsed.
	 */
	if (retval && (state->path.active > 1)) {
		error = xfs_da3_join(state);
		if (error)
			goto out;
		error = xfs_defer_finish(&args->trans);
		if (error)
			goto out;
		/*
		 * Commit the Btree join operation and start a new trans.
		 */
		error = xfs_trans_roll_inode(&args->trans, dp);
		if (error)
			goto out;
	}

	/*
	 * If the result is small enough, push it all into the inode.
	 */
	if (xfs_bmap_one_block(dp, XFS_ATTR_FORK)) {
		/*
		 * Have to get rid of the copy of this dabuf in the state.
		 */
		ASSERT(state->path.active == 1);
		ASSERT(state->path.blk[0].bp);
		state->path.blk[0].bp = NULL;

		error = xfs_attr3_leaf_read(args->trans, args->dp, 0, -1, &bp);
		if (error)
			goto out;

		if ((forkoff = xfs_attr_shortform_allfit(bp, dp))) {
			error = xfs_attr3_leaf_to_shortform(bp, args, forkoff);
			/* bp is gone due to xfs_da_shrink_inode */
			if (error)
				goto out;
			error = xfs_defer_finish(&args->trans);
			if (error)
				goto out;
		} else
			xfs_trans_brelse(args->trans, bp);
	}
	error = 0;

out:
	xfs_da_state_free(state);
	return error;
}