xfs_dir2_off_t
xfs_dir2_db_off_to_byte(xfs_mount_t *mp, xfs_dir2_db_t db,
xfs_dir2_data_aoff_t o)
{
return XFS_DIR2_DB_OFF_TO_BYTE(mp, db, o);
}
/*
* Remove the given block from the directory.
* This routine is used for data and free blocks, leaf/node are done
* by xfs_da_shrink_inode.
*/
int
xfs_dir2_shrink_inode(
xfs_da_args_t *args,
xfs_dir2_db_t db,
xfs_dabuf_t *bp)
{
xfs_fileoff_t bno; /* directory file offset */
xfs_dablk_t da; /* directory file offset */
int done; /* bunmap is finished */
xfs_inode_t *dp;
int error;
xfs_mount_t *mp;
xfs_trans_t *tp;
xfs_dir2_trace_args_db("shrink_inode", args, db, bp);
dp = args->dp;
mp = dp->i_mount;
tp = args->trans;
da = XFS_DIR2_DB_TO_DA(mp, db);
/*
* Unmap the fsblock(s).
*/
if ((error = xfs_bunmapi(tp, dp, da, mp->m_dirblkfsbs,
XFS_BMAPI_METADATA, 0, args->firstblock, args->flist,
NULL, &done))) {
/*
* ENOSPC actually can happen if we're in a removename with
* no space reservation, and the resulting block removal
* would cause a bmap btree split or conversion from extents
* to btree. This can only happen for un-fragmented
* directory blocks, since you need to be punching out
* the middle of an extent.
* In this case we need to leave the block in the file,
* and not binval it.
* So the block has to be in a consistent empty state
* and appropriately logged.
* We don't free up the buffer, the caller can tell it
* hasn't happened since it got an error back.
*/
return error;
}
ASSERT(done);
/*
* Invalidate the buffer from the transaction.
*/
xfs_da_binval(tp, bp);
/*
* If it's not a data block, we're done.
*/
if (db >= XFS_DIR2_LEAF_FIRSTDB(mp))
return 0;
/*
* If the block isn't the last one in the directory, we're done.
*/
if (dp->i_d.di_size > XFS_DIR2_DB_OFF_TO_BYTE(mp, db + 1, 0))
return 0;
bno = da;
if ((error = xfs_bmap_last_before(tp, dp, &bno, XFS_DATA_FORK))) {
/*
* This can't really happen unless there's kernel corruption.
*/
return error;
}
if (db == mp->m_dirdatablk)
ASSERT(bno == 0);
else
ASSERT(bno > 0);
/*
* Set the size to the new last block.
*/
dp->i_d.di_size = XFS_FSB_TO_B(mp, bno);
xfs_trans_log_inode(tp, dp, XFS_ILOG_CORE);
return 0;
}
