TRUNCATE_INODE_PAGES(9) Memory Management in Linux TRUNCATE_INODE_PAGES(9)NAMEtruncate_inode_pages_range - truncate range of pages specified by start
& end byte offsets
SYNOPSIS
void truncate_inode_pages_range(struct address_space * mapping,
loff_t lstart, loff_t lend);
ARGUMENTS
mapping
mapping to truncate
lstart
offset from which to truncate
lend
offset to which to truncate (inclusive)
DESCRIPTION
Truncate the page cache, removing the pages that are between specified
offsets (and zeroing out partial pages if lstart or lend + 1 is not
page aligned).
Truncate takes two passes - the first pass is nonblocking. It will not
block on page locks and it will not block on writeback. The second pass
will wait. This is to prevent as much IO as possible in the affected
region. The first pass will remove most pages, so the search cost of
the second pass is low.
We pass down the cache-hot hint to the page freeing code. Even if the
mapping is large, it is probably the case that the final pages are the
most recently touched, and freeing happens in ascending file offset
order.
Note that since ->invalidatepage accepts range to invalidate
truncate_inode_pages_range is able to handle cases where lend + 1 is
not page aligned properly.
COPYRIGHTKernel Hackers Manual 3.11 November 2013 TRUNCATE_INODE_PAGES(9)
