Hugh Dickins 623e3db9f9
mm for fs: add truncate_pagecache_range() ...
Holepunching filesystems ext4 and xfs are using truncate_inode_pages_range
but forgetting to unmap pages first (ocfs2 remembers). This is not really
a bug, since races already require truncate_inode_page() to handle that
case once the page is locked; but it can be very inefficient if the file
being punched happens to be mapped into many vmas.
Provide a drop-in replacement truncate_pagecache_range() which does the
unmapping pass first, handling the awkward mismatch between arguments to
truncate_inode_pages_range() and arguments to unmap_mapping_range().
Note that holepunching does not unmap privately COWed pages in the range:
POSIX requires that we do so when truncating, but it's hard to justify,
difficult to implement without an i_size cutoff, and no filesystem is
attempting to implement it.
Signed-off-by: Hugh Dickins <hughd@google.com >
Cc: "Theodore Ts'o" <tytso@mit.edu >
Cc: Andreas Dilger <adilger.kernel@dilger.ca >
Cc: Mark Fasheh <mfasheh@suse.com >
Cc: Joel Becker <jlbec@evilplan.org >
Cc: Ben Myers <bpm@sgi.com >
Cc: Alex Elder <elder@kernel.org >
Cc: Christoph Hellwig <hch@lst.de >
Cc: Dave Chinner <david@fromorbit.com >
Cc: Al Viro <viro@zeniv.linux.org.uk >
Signed-off-by: Andrew Morton <akpm@linux-foundation.org >
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org >
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