The patch titled
hugetlb: allow extending ftruncate on hugetlbfs
has been added to the -mm tree. Its filename is
hugetlb-allow-extending-ftruncate-on-hugetlbfs.patch
*** Remember to use Documentation/SubmitChecklist when testing your code ***
See http://www.zip.com.au/~akpm/linux/patches/stuff/added-to-mm.txt to find
out what to do about this
------------------------------------------------------
Subject: hugetlb: allow extending ftruncate on hugetlbfs
From: "Ken Chen" <kenchen@xxxxxxxxxx>
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@xxxxxxxxxx>
Acked-by: Wiliam Irwin <wli@xxxxxxxxxxxxxx>
Cc: Adam Litke <agl@xxxxxxxxxx>
Cc: David Gibson <david@xxxxxxxxxxxxxxxxxxxxx>
Cc: Nishanth Aravamudan <nacc@xxxxxxxxxx>
Signed-off-by: Andrew Morton <akpm@xxxxxxxxxxxxxxxxxxxx>
---
fs/hugetlbfs/inode.c | 8 +-------
1 file changed, 1 insertion(+), 7 deletions(-)
diff -puN fs/hugetlbfs/inode.c~hugetlb-allow-extending-ftruncate-on-hugetlbfs fs/hugetlbfs/inode.c
--- a/fs/hugetlbfs/inode.c~hugetlb-allow-extending-ftruncate-on-hugetlbfs
+++ a/fs/hugetlbfs/inode.c
@@ -313,21 +313,15 @@ hugetlb_vmtruncate_list(struct prio_tree
}
}
-/*
- * 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);
_
Patches currently in -mm which might be from kenchen@xxxxxxxxxx are
hugetlb-allow-extending-ftruncate-on-hugetlbfs.patch
cache-pipe-buf-page-address-for-non-highmem-arch.patch
writeback-fix-periodic-superblock-dirty-inode-flushing.patch
-
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