Disk cache: Reset mask_ when the disk cache is being restarted.

It is possible that the size for the index table is reduced when
the cache is restarted (the available disk space could be lower
than what it was when the cache was originally created). If that
is the case, not resetting mask_ to 0 will prevent the mask to
be set correctly for the new table size, resulting in a crash.

BUG=12378
TEST=unittests

Review URL: http://codereview.chromium.org/113930

git-svn-id: svn://svn.chromium.org/chrome/trunk/src@17052 0039d316-1c4b-4281-b951-d872f2087c98

6 files changed, 66 insertions, 0 deletions

diff --git a/net/data/cache_tests/bad_rankings2/contents.txt b/net/data/cache_tests/bad_rankings2/contents.txt
new file mode 100644
index 0000000..a949728
--- /dev/null
+++ b/net/data/cache_tests/bad_rankings2/contents.txt
@@ -0,0 +1,66 @@
+Index header:
+num_entries: 2
+num_bytes: 27
+this_id: 1
+table_len: 64k
+
+head: 0x90000001
+tail: 0x90000000
+
+Address: 0xa0010002
+Address: 0xa0010003
+
+-------------------------------
+
+entry:
+Address: 0xa0010002
+hash: 0x687d1422
+next: 0
+rankings_node: 0x90000000
+key_len: 13
+long_key: 0
+data_size: 0's
+data_addr: 0's
+key: "the first key"
+
+rankings:
+Address: 0x90000000
+next: 0x90000000
+prev: 0                 <------ wrong
+contents: 0xa0010002
+dirty: 0
+pointer: 0
+
+-------------------------------
+
+entry:
+Address: 0xa0010003
+hash: 0x63909ecb
+next: 0
+rankings_node: 0x90000001
+key_len: 14
+long_key: 0
+data_size: 0's
+data_addr: 0's
+key: "some other key"
+
+rankings:
+Address: 0x90000001
+next: 0x90000000
+prev: 0x90000001
+contents: 0xa0010003
+dirty: 0
+pointer: 0
+
+================================
+
+Generated with:
+
+disk_cache::Entry *entry;
+ASSERT_TRUE(cache_->CreateEntry("the first key", &entry));
+entry->Close();
+
+ASSERT_TRUE(cache_->CreateEntry("some other key", &entry));   <---- Edit value*
+entry->Close();
+
+* Edit the value with the debugger before it is saved to disk.
\ No newline at end of file
diff --git a/net/data/cache_tests/bad_rankings2/data_0 b/net/data/cache_tests/bad_rankings2/data_0
new file mode 100644
index 0000000..5b32215
--- /dev/null
+++ b/net/data/cache_tests/bad_rankings2/data_0
diff --git a/net/data/cache_tests/bad_rankings2/data_1 b/net/data/cache_tests/bad_rankings2/data_1
new file mode 100644
index 0000000..7241f13
--- /dev/null
+++ b/net/data/cache_tests/bad_rankings2/data_1
diff --git a/net/data/cache_tests/bad_rankings2/data_2 b/net/data/cache_tests/bad_rankings2/data_2
new file mode 100644
index 0000000..c7e2eb9
--- /dev/null
+++ b/net/data/cache_tests/bad_rankings2/data_2
diff --git a/net/data/cache_tests/bad_rankings2/data_3 b/net/data/cache_tests/bad_rankings2/data_3
new file mode 100644
index 0000000..5eec973
--- /dev/null
+++ b/net/data/cache_tests/bad_rankings2/data_3
diff --git a/net/data/cache_tests/bad_rankings2/index b/net/data/cache_tests/bad_rankings2/index
new file mode 100644
index 0000000..602dfba
--- /dev/null
+++ b/net/data/cache_tests/bad_rankings2/index