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-rw-r--r--fs/btrfs/inode.c14
1 files changed, 14 insertions, 0 deletions
diff --git a/fs/btrfs/inode.c b/fs/btrfs/inode.c
index 5792816d4fc..9b43a6f303b 100644
--- a/fs/btrfs/inode.c
+++ b/fs/btrfs/inode.c
@@ -360,6 +360,19 @@ again:
nr_pages = (end >> PAGE_CACHE_SHIFT) - (start >> PAGE_CACHE_SHIFT) + 1;
nr_pages = min(nr_pages, (128 * 1024UL) / PAGE_CACHE_SIZE);
+ /*
+ * we don't want to send crud past the end of i_size through
+ * compression, that's just a waste of CPU time. So, if the
+ * end of the file is before the start of our current
+ * requested range of bytes, we bail out to the uncompressed
+ * cleanup code that can deal with all of this.
+ *
+ * It isn't really the fastest way to fix things, but this is a
+ * very uncommon corner.
+ */
+ if (actual_end <= start)
+ goto cleanup_and_bail_uncompressed;
+
total_compressed = actual_end - start;
/* we want to make sure that amount of ram required to uncompress
@@ -504,6 +517,7 @@ again:
goto again;
}
} else {
+cleanup_and_bail_uncompressed:
/*
* No compression, but we still need to write the pages in
* the file we've been given so far. redirty the locked