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zero out last page for llseek/write 

When one llseek's past the end of the file and then writes, every page past
the previous end of the file should be cleared.  Trevor found that the code,
as is, does not assure that the very last page is always cleared.  This patch
takes care of that.

Signed-off-by: Michael Halcrow <mhalcrow@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
This commit is contained in:
Michael Halcrow 2007-06-27 14:09:45 -07:00 committed by Linus Torvalds
parent e10f281bca
commit d4c5cdb3e0
1 changed files with 2 additions and 0 deletions
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2
fs/ecryptfs/mmap.c
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@ -422,6 +422,8 @@ static int ecryptfs_prepare_write(struct file *file, struct page *page,
goto out;
}
}
if (end_of_prev_pg_pos + 1 > i_size_read(page->mapping->host))
zero_user_page(page, 0, PAGE_CACHE_SIZE, KM_USER0);
}
out:
return rc;