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authorHugh Dickins <hughd@google.com>2011-06-27 16:18:01 -0700
committerLinus Torvalds <torvalds@linux-foundation.org>2011-06-27 18:00:12 -0700
commit5b8ba10198a109f8a02380648c5d29000caa9c55 (patch)
tree1e4328d86395baa3d429c0d9911b7d7e1272629d /mm/truncate.c
parent4d258b25d947521c8b913154db61ec55198243f8 (diff)
downloadop-kernel-dev-5b8ba10198a109f8a02380648c5d29000caa9c55.zip
op-kernel-dev-5b8ba10198a109f8a02380648c5d29000caa9c55.tar.gz
mm: move vmtruncate_range to truncate.c
You would expect to find vmtruncate_range() next to vmtruncate() in mm/truncate.c: move it there. Signed-off-by: Hugh Dickins <hughd@google.com> Acked-by: Christoph Hellwig <hch@infradead.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'mm/truncate.c')
-rw-r--r--mm/truncate.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/mm/truncate.c b/mm/truncate.c
index 3a29a61..5b4c3a4 100644
--- a/mm/truncate.c
+++ b/mm/truncate.c
@@ -603,3 +603,27 @@ int vmtruncate(struct inode *inode, loff_t offset)
return 0;
}
EXPORT_SYMBOL(vmtruncate);
+
+int vmtruncate_range(struct inode *inode, loff_t offset, loff_t end)
+{
+ struct address_space *mapping = inode->i_mapping;
+
+ /*
+ * If the underlying filesystem is not going to provide
+ * a way to truncate a range of blocks (punch a hole) -
+ * we should return failure right now.
+ */
+ if (!inode->i_op->truncate_range)
+ return -ENOSYS;
+
+ mutex_lock(&inode->i_mutex);
+ down_write(&inode->i_alloc_sem);
+ unmap_mapping_range(mapping, offset, (end - offset), 1);
+ truncate_inode_pages_range(mapping, offset, end);
+ unmap_mapping_range(mapping, offset, (end - offset), 1);
+ inode->i_op->truncate_range(inode, offset, end);
+ up_write(&inode->i_alloc_sem);
+ mutex_unlock(&inode->i_mutex);
+
+ return 0;
+}
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