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truncate: new helpers

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Introduce new truncate helpers truncate_pagecache and inode_newsize_ok.
vmtruncate is also consolidated from mm/memory.c and mm/nommu.c and
into mm/truncate.c.

Reviewed-by: Christoph Hellwig <[email protected]>
Signed-off-by: Nick Piggin <[email protected]>
Signed-off-by: Al Viro <[email protected]>
This commit is contained in:
[email protected] 2009-08-21 02:35:05 +10:00 • committed by al
commit 25d9e2d152
9 changed files with 120 additions and 108 deletions
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mm/filemap.c
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@ -58,7 +58,7 @@
/*
* Lock ordering:
*
* ->i_mmap_lock (vmtruncate)
* ->i_mmap_lock (truncate_pagecache)
* ->private_lock (__free_pte->__set_page_dirty_buffers)
* ->swap_lock (exclusive_swap_page, others)
* ->mapping->tree_lock