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author | Hugh Dickins <hughd@google.com> | 2011-06-27 16:18:01 -0700 |
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committer | Linus Torvalds <torvalds@linux-foundation.org> | 2011-06-27 18:00:12 -0700 |
commit | 5b8ba10198a109f8a02380648c5d29000caa9c55 (patch) | |
tree | 1e4328d86395baa3d429c0d9911b7d7e1272629d /mm/truncate.c | |
parent | 4d258b25d947521c8b913154db61ec55198243f8 (diff) | |
download | linux-3.10-5b8ba10198a109f8a02380648c5d29000caa9c55.tar.gz linux-3.10-5b8ba10198a109f8a02380648c5d29000caa9c55.tar.bz2 linux-3.10-5b8ba10198a109f8a02380648c5d29000caa9c55.zip |
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.c | 24 |
1 files changed, 24 insertions, 0 deletions
diff --git a/mm/truncate.c b/mm/truncate.c index 3a29a618021..5b4c3a4847e 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; +} |