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-rw-r--r--mm/truncate.c25
1 files changed, 0 insertions, 25 deletions
diff --git a/mm/truncate.c b/mm/truncate.c
index 61a183b89df6..75801acdaac7 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -602,31 +602,6 @@ int vmtruncate(struct inode *inode, loff_t newsize)
602} 602}
603EXPORT_SYMBOL(vmtruncate); 603EXPORT_SYMBOL(vmtruncate);
604 604
605int vmtruncate_range(struct inode *inode, loff_t lstart, loff_t lend)
606{
607 struct address_space *mapping = inode->i_mapping;
608 loff_t holebegin = round_up(lstart, PAGE_SIZE);
609 loff_t holelen = 1 + lend - holebegin;
610
611 /*
612 * If the underlying filesystem is not going to provide
613 * a way to truncate a range of blocks (punch a hole) -
614 * we should return failure right now.
615 */
616 if (!inode->i_op->truncate_range)
617 return -ENOSYS;
618
619 mutex_lock(&inode->i_mutex);
620 inode_dio_wait(inode);
621 unmap_mapping_range(mapping, holebegin, holelen, 1);
622 inode->i_op->truncate_range(inode, lstart, lend);
623 /* unmap again to remove racily COWed private pages */
624 unmap_mapping_range(mapping, holebegin, holelen, 1);
625 mutex_unlock(&inode->i_mutex);
626
627 return 0;
628}
629
630/** 605/**
631 * truncate_pagecache_range - unmap and remove pagecache that is hole-punched 606 * truncate_pagecache_range - unmap and remove pagecache that is hole-punched
632 * @inode: inode 607 * @inode: inode