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Bug 433129 - Add a storage.nfs_filesystem preference and change the underlying file system to an nfs-friendly one when it's set. r=asuth

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This commit is contained in:
Martin Stransky 2012-09-06 17:58:46 -04:00
parent 09194a3074
commit 1cac72cad7
1 changed files with 26 additions and 5 deletions
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31
storage/src/TelemetryVFS.cpp
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@ -6,10 +6,21 @@
#include <string.h>
#include "mozilla/Telemetry.h"
#include "mozilla/Preferences.h"
#include "sqlite3.h"
#include "nsThreadUtils.h"
#include "mozilla/Util.h"
/**
* This preference is a workaround to allow users/sysadmins to identify
* that the profile exists on an NFS share whose implementation
* is incompatible with SQLite's default locking implementation.
* Bug 433129 attempted to automatically identify such file-systems,
* but a reliable way was not found and it was determined that the fallback
* locking is slower than POSIX locking, so we do not want to do it by default.
*/
#define PREF_NFS_FILESYSTEM "storage.nfs_filesystem"
namespace {
using namespace mozilla;
@ -435,13 +446,23 @@ namespace storage {
sqlite3_vfs* ConstructTelemetryVFS()
{
#if defined(XP_WIN)
#define EXPECTED_VFS "win32"
#define EXPECTED_VFS "win32"
#define EXPECTED_VFS_NFS "win32"
#else
#define EXPECTED_VFS "unix"
#define EXPECTED_VFS "unix"
#define EXPECTED_VFS_NFS "unix-excl"
#endif
sqlite3_vfs *vfs = sqlite3_vfs_find(NULL);
const bool expected_vfs = vfs->zName && !strcmp(vfs->zName, EXPECTED_VFS);
bool expected_vfs;
sqlite3_vfs *vfs;
if (Preferences::GetBool(PREF_NFS_FILESYSTEM)) {
vfs = sqlite3_vfs_find(EXPECTED_VFS_NFS);
expected_vfs = (vfs != nullptr);
}
else {
vfs = sqlite3_vfs_find(NULL);
expected_vfs = vfs->zName && !strcmp(vfs->zName, EXPECTED_VFS);
}
if (!expected_vfs) {
return NULL;
}