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Subject[PATCH] ftruncate on huge page couldn't extend hugetlb file
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From: Zhang Yanmin <yanmin.zhang@intel.com>

Currently, ftruncate on hugetlb files couldn't extend them. My patch enables it.

This patch is against 2.6.16-rc5-mm3 and on the top of the patch which
implements mmap on zero-length hugetlb files with PROT_NONE.

Thanks for Ken's good idea.

Signed-off-by: Zhang Yanmin <yanmin.zhang@intel.com>

---

diff -Nraup linux-2.6.16-rc5-mm3_huge_check/fs/hugetlbfs/inode.c linux-2.6.16-rc5-mm3_truncate/fs/hugetlbfs/inode.c
--- linux-2.6.16-rc5-mm3_huge_check/fs/hugetlbfs/inode.c 2006-03-08 18:17:15.000000000 +0800
+++ linux-2.6.16-rc5-mm3_truncate/fs/hugetlbfs/inode.c 2006-03-08 18:50:40.000000000 +0800
@@ -308,18 +308,22 @@ static int hugetlb_vmtruncate(struct ino
unsigned long pgoff;
struct address_space *mapping = inode->i_mapping;

- if (offset > inode->i_size)
- return -EINVAL;
-
BUG_ON(offset & ~HPAGE_MASK);
pgoff = offset >> HPAGE_SHIFT;
-
- inode->i_size = offset;
- spin_lock(&mapping->i_mmap_lock);
- if (!prio_tree_empty(&mapping->i_mmap))
- hugetlb_vmtruncate_list(&mapping->i_mmap, pgoff);
- spin_unlock(&mapping->i_mmap_lock);
- truncate_hugepages(inode, offset);
+ if (offset > inode->i_size) {
+ if (hugetlb_extend_reservation(HUGETLBFS_I(inode), pgoff) != 0)
+ return -ENOMEM;
+ inode->i_size = offset;
+ }
+ else {
+
+ inode->i_size = offset;
+ spin_lock(&mapping->i_mmap_lock);
+ if (!prio_tree_empty(&mapping->i_mmap))
+ hugetlb_vmtruncate_list(&mapping->i_mmap, pgoff);
+ spin_unlock(&mapping->i_mmap_lock);
+ truncate_hugepages(inode, offset);
+ }
return 0;
}


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