From 7aa91e104028b87ff13f5eeb7a0d7ffe7b5a2348 Mon Sep 17 00:00:00 2001
From: Ken Chen <kenchen@google.com>
Date: Tue, 16 Oct 2007 01:26:21 -0700
Subject: hugetlb: allow extending ftruncate on hugetlbfs
For historical reason, expanding ftruncate that increases file size on
hugetlbfs is not allowed due to pages were pre-faulted and lack of fault
handler. Now that we have demand faulting on hugetlb since 2.6.15, there
is no reason to hold back that limitation.
This will make hugetlbfs behave more like a normal fs. I'm writing a user
level code that uses hugetlbfs but will fall back to tmpfs if there are no
hugetlb page available in the system. Having hugetlbfs specific ftruncate
behavior is a bit quirky and I would like to remove that artificial
limitation.
Signed-off-by: <kenchen@google.com>
Acked-by: Wiliam Irwin <wli@holomorphy.com>
Cc: Adam Litke <agl@us.ibm.com>
Cc: David Gibson <david@gibson.dropbear.id.au>
Cc: Nishanth Aravamudan <nacc@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
---
fs/hugetlbfs/inode.c | 8 +-------
1 file changed, 1 insertion(+), 7 deletions(-)
(limited to 'fs')
diff --git a/fs/hugetlbfs/inode.c b/fs/hugetlbfs/inode.c
index 70fbb29fb2..8f8e13385e 100644
--- a/fs/hugetlbfs/inode.c
+++ b/fs/hugetlbfs/inode.c
@@ -322,21 +322,15 @@ hugetlb_vmtruncate_list(struct prio_tree_root *root, pgoff_t pgoff)
}
}
-/*
- * Expanding truncates are not allowed.
- */
static int hugetlb_vmtruncate(struct inode *inode, loff_t offset)
{
pgoff_t pgoff;
struct address_space *mapping = inode->i_mapping;
- if (offset > inode->i_size)
- return -EINVAL;
-
BUG_ON(offset & ~HPAGE_MASK);
pgoff = offset >> PAGE_SHIFT;
- inode->i_size = offset;
+ i_size_write(inode, offset);
spin_lock(&mapping->i_mmap_lock);
if (!prio_tree_empty(&mapping->i_mmap))
hugetlb_vmtruncate_list(&mapping->i_mmap, pgoff);
--
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