From 3c6597a3076052b6cf09fdfdce037b0ab036c3ac Mon Sep 17 00:00:00 2001
From: Michal Novotny <michal.novotny@gmail.com>
Date: Tue, 27 Jan 2015 02:29:02 +0100
Subject: [PATCH] Bug 1120945 - HTTP cache v2: maximum number of entries is
 limited to 13106 on FAT32, r=honzab

---
 netwerk/cache2/CacheFileIOManager.cpp | 24 ++++++++++++++++++++++++
 1 file changed, 24 insertions(+)

diff --git a/netwerk/cache2/CacheFileIOManager.cpp b/netwerk/cache2/CacheFileIOManager.cpp
index 353caf2b3d3..407d727cd5f 100644
--- a/netwerk/cache2/CacheFileIOManager.cpp
+++ b/netwerk/cache2/CacheFileIOManager.cpp
@@ -3596,6 +3596,30 @@ CacheFileIOManager::OpenNSPRHandle(CacheFileHandle *aHandle, bool aCreate)
   if (aCreate) {
     rv = aHandle->mFile->OpenNSPRFileDesc(
            PR_RDWR | PR_CREATE_FILE | PR_TRUNCATE, 0600, &aHandle->mFD);
+    if (rv == NS_ERROR_FILE_NO_DEVICE_SPACE) {
+      LOG(("CacheFileIOManager::OpenNSPRHandle() - Cannot create a new file, we"
+           " might reached a limit on FAT32. Will evict a single entry and try "
+           "again. [hash=%08x%08x%08x%08x%08x]", LOGSHA1(aHandle->Hash())));
+
+      SHA1Sum::Hash hash;
+      uint32_t cnt;
+
+      rv = CacheIndex::GetEntryForEviction(&hash, &cnt);
+      if (NS_SUCCEEDED(rv)) {
+        rv = DoomFileByKeyInternal(&hash, true);
+      }
+      if (NS_SUCCEEDED(rv)) {
+        rv = aHandle->mFile->OpenNSPRFileDesc(
+               PR_RDWR | PR_CREATE_FILE | PR_TRUNCATE, 0600, &aHandle->mFD);
+        LOG(("CacheFileIOManager::OpenNSPRHandle() - Successfully evicted entry"
+             " with hash %08x%08x%08x%08x%08x. %s to create the new file.",
+             LOGSHA1(&hash), NS_SUCCEEDED(rv) ? "Succeeded" : "Failed"));
+      } else {
+        LOG(("CacheFileIOManager::OpenNSPRHandle() - Couldn't evict an existing"
+             " entry."));
+        rv = NS_ERROR_FILE_NO_DEVICE_SPACE;
+      }
+    }
     NS_ENSURE_SUCCESS(rv, rv);
 
     aHandle->mFileExists = true;