static Inotify()
{
if (Environment.GetEnvironmentVariable("BEAGLE_DISABLE_INOTIFY") != null)
{
Logger.Log.Debug("BEAGLE_DISABLE_INOTIFY is set");
return;
}
if (Environment.GetEnvironmentVariable("BEAGLE_INOTIFY_VERBOSE") != null)
{
Inotify.Verbose = true;
}
try {
inotify_fd = inotify_glue_init();
} catch (EntryPointNotFoundException) {
Logger.Log.Info("Inotify not available on system.");
return;
}
if (inotify_fd < 0)
{
Mono.Unix.Native.Errno errno = Mono.Unix.Native.NativeConvert.ToErrno(-inotify_fd);
string error_message;
if (errno == Mono.Unix.Native.Errno.ENOSYS)
{
error_message = "Inotify not supported! You need a 2.6.13 kernel or later with CONFIG_INOTIFY enabled.";
}
else
{
error_message = Mono.Unix.UnixMarshal.GetErrorDescription(errno);
}
Logger.Log.Warn("Could not initialize inotify: {0}", error_message);
}
else
{
try {
FileStream fs = new FileStream("/proc/sys/fs/inotify/max_user_watches", FileMode.Open, FileAccess.Read);
StreamReader r = new StreamReader(fs);
string line = r.ReadLine();
r.Close();
int watches = -1;
try {
watches = Int32.Parse(line);
} catch (FormatException) { }
if (watches > -1 && watches < 32768)
{
Log.Warn("Inotify watches may be too low ({0}) for some users! Increase it to at least 65535 by setting fs.inotify.max_user_watches in /etc/sysctl.conf", watches);
}
} catch { }
}
}
// Ensure our watch exists, meets all the subscribers requirements,
// and isn't matching any other events that we don't care about.
private static void CreateOrModifyWatch(WatchInfo watched)
{
EventType new_mask = base_mask;
foreach (WatchInternal watch in watched.Subscribers)
{
new_mask |= watch.Mask;
}
if (watched.Wd >= 0 && watched.Mask == new_mask)
{
return;
}
//Log.Debug ("{0} inotify watch on {1}", watched.Wd >= 0 ? "Recreating" : "Creating", watched.Path);
// We rely on the behaviour that watching the same inode twice won't result
// in the wd value changing.
// (no need to worry about watched_by_wd being polluted with stale watches)
int wd = -1;
wd = inotify_glue_watch(inotify_fd, watched.Path, new_mask);
if (wd < 0)
{
Mono.Unix.Native.Errno errno = Mono.Unix.Native.NativeConvert.ToErrno(-wd);
if (!watch_limit_error_displayed && errno == Mono.Unix.Native.Errno.ENOSPC)
{
Log.Error("Maximum inotify watch limit hit adding watch to {0}. Try adjusting /proc/sys/fs/inotify/max_user_watches", watched.Path);
watch_limit_error_displayed = true;
}
string msg = String.Format("Attempt to watch {0} failed: {1}", watched.Path, Mono.Unix.UnixMarshal.GetErrorDescription(errno));
throw new IOException(msg);
}
if (watched.Wd >= 0 && watched.Wd != wd)
{
string msg = String.Format("Watch handle changed unexpectedly!", watched.Path);
throw new IOException(msg);
}
watched.Wd = wd;
watched.Mask = new_mask;
}
private static void Unsubscribe(WatchInfo watched, WatchInternal watch)
{
watched.Subscribers.Remove(watch);
// Other subscribers might still be around
if (watched.Subscribers.Count > 0)
{
// Minimize it
CreateOrModifyWatch(watched);
return;
}
int retval = inotify_glue_ignore(inotify_fd, watched.Wd);
if (retval < 0)
{
Mono.Unix.Native.Errno errno = Mono.Unix.Native.NativeConvert.ToErrno(-retval);
string msg = String.Format("Attempt to ignore {0} failed: {1}", watched.Path, Mono.Unix.UnixMarshal.GetErrorDescription(errno));
throw new IOException(msg);
}
Forget(watched);
return;
}
public override bool Obtain()
{
Log("Trying to obtain lock " + lockFile.FullName);
if (Lucene.Net.Store.FSDirectory.disableLocks || Enclosing_Instance.InstanceDisableLock)
{
return(true);
}
bool tmpBool;
if (System.IO.File.Exists(Enclosing_Instance.lockDir.FullName))
{
tmpBool = true;
}
else
{
tmpBool = System.IO.Directory.Exists(Enclosing_Instance.lockDir.FullName);
}
if (!tmpBool)
{
try
{
System.IO.Directory.CreateDirectory(Enclosing_Instance.lockDir.FullName);
}
catch (Exception)
{
throw new System.IO.IOException("Cannot create lock directory: " + Enclosing_Instance.lockDir);
}
}
try
{
int fd = Mono.Unix.Native.Syscall.open(
lockFile.FullName,
Mono.Unix.Native.OpenFlags.O_RDWR |
Mono.Unix.Native.OpenFlags.O_CREAT |
Mono.Unix.Native.OpenFlags.O_EXCL,
Mono.Unix.Native.FilePermissions.S_IRUSR);
if (fd == -1)
{
Mono.Unix.Native.Errno error = Mono.Unix.Native.Stdlib.GetLastError();
if (error == Mono.Unix.Native.Errno.ENOSPC)
{
throw new Beagle.Util.NoSpaceException();
}
else
{
throw new System.IO.IOException("Could not create lock file: "
+ Mono.Unix.Native.Stdlib.strerror(error));
}
}
// This code replaces the commented-out code below because
// it ends up being much faster. The reason for this is
// that closing a UnixStream causes Syscall.fsync() to be
// called, and that apparently is extremely slow!
//
// Time(ms) Count P/call(ms) Method name
// 1563.926 68 22.999 Mono.Unix.Native.Syscall::fsync(int)
//
// Since the lock file is written out very often, this time
// adds up and noticably slows down indexing.
IntPtr ptr = IntPtr.Zero;
long ret;
try {
string s = System.Diagnostics.Process.GetCurrentProcess().Id.ToString() + "\n";
ptr = Mono.Unix.UnixMarshal.StringToHeap(s);
do
{
ret = Mono.Unix.Native.Syscall.write(fd, ptr, (ulong)s.Length);
} while (Mono.Unix.UnixMarshal.ShouldRetrySyscall((int)ret));
if ((int)ret == -1)
{
Mono.Unix.Native.Errno error = Mono.Unix.Native.Stdlib.GetLastError();
if (error == Mono.Unix.Native.Errno.ENOSPC)
{
throw new Beagle.Util.NoSpaceException();
}
else
{
Mono.Unix.UnixMarshal.ThrowExceptionForError(error);
}
}
} finally {
Mono.Unix.UnixMarshal.FreeHeap(ptr);
do
{
ret = Mono.Unix.Native.Syscall.close(fd);
} while (Mono.Unix.UnixMarshal.ShouldRetrySyscall((int)ret));
Mono.Unix.UnixMarshal.ThrowExceptionForLastErrorIf((int)ret);
}
//System.IO.StreamWriter w = new System.IO.StreamWriter (new Mono.Unix.UnixStream (fd, true));
//w.WriteLine (System.Diagnostics.Process.GetCurrentProcess ().Id);
//w.Close ();
return(true);
}
catch (Beagle.Util.NoSpaceException e)
{
throw e;
}
catch (Exception e)
{
Log("Exception in CreateNew for file:" + lockFile.FullName + ":" + e);
return(false);
}
}