features/trash initial cleanup commit

* support O_TRUNC flag in open (call comes to FS as 'truncate'
  or 'ftruncate' fop)
* option to provide 'eliminate-pattern' so those files matching
  won't be kept in trash. Eg:
      option eliminate-pattern *.out|*~
* option to give 'maximum' file size to keep in trash, ie, when a
  20GB file is deleted, it won't be kept in trash if max file size
  given is 1GB. Eg:
      option max-trashable-file-size 1GB

These particular features are developped as a part of college project
by following team:

Sunil bhagwath <sunilkbhagwat@gmail.com>
Yashaswi Kumar <yashaswikumar@gmail.com>
Rashmi B K     <rashmibk17@gmail.com>
Sandeep M      <astrophyster@gmail.com>

Submitting after minor coding standard edits and memoryleak fixes.

Signed-off-by: Amar Tumballi <amar@gluster.com>
Signed-off-by: Anand V. Avati <avati@dev.gluster.com>

BUG: 142 (enhance features/trash  translator so it can work on client side too..)
URL: http://bugs.gluster.com/cgi-bin/bugzilla3/show_bug.cgi?id=142

1 files changed, 80 insertions, 0 deletions

diff --git a/xlators/features/trash/src/trash.h b/xlators/features/trash/src/trash.h
new file mode 100644
index 00000000000..7f0e13085b1
--- /dev/null
+++ b/xlators/features/trash/src/trash.h
@@ -0,0 +1,80 @@
+/*
+  Copyright (c) 2006, 2007, 2008 Z RESEARCH, Inc. <http://www.zresearch.com>
+  This file is part of GlusterFS.
+
+  GlusterFS is free software; you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published
+  by the Free Software Foundation; either version 3 of the License,
+  or (at your option) any later version.
+
+  GlusterFS is distributed in the hope that it will be useful, but
+  WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+  General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see
+  <http://www.gnu.org/licenses/>.
+*/
+
+#ifndef __TRASH_H__
+#define __TRASH_H__
+
+#ifndef _CONFIG_H
+#define _CONFIG_H
+#include "config.h"
+#endif
+
+#include "glusterfs.h"
+#include "logging.h"
+#include "dict.h"
+#include "xlator.h"
+#include "defaults.h"
+#include "inode.c"
+#include "fnmatch.h"
+
+#include <libgen.h>
+
+#ifndef GF_BLOCK_READV_SIZE
+#define GF_BLOCK_READV_SIZE      (128 * GF_UNIT_KB)
+#endif
+
+#ifndef GF_DEFAULT_MAX_FILE_SIZE
+#define GF_DEFAULT_MAX_FILE_SIZE (200 * GF_UNIT_MB)
+#endif
+
+#ifndef GF_ALLOWED_MAX_FILE_SIZE
+#define GF_ALLOWED_MAX_FILE_SIZE (1 * GF_UNIT_GB)
+#endif
+
+
+struct trash_struct {
+        fd_t    *fd;         /* for the fd of existing file */
+        fd_t    *newfd;      /* for the newly created file */
+        loc_t    loc;        /* to store the location of the existing file */
+        loc_t    newloc;     /* to store the location for the new file */
+        size_t   fsize;      /* for keeping the size of existing file */
+        off_t    cur_offset; /* current offset for read and write ops */
+        off_t    fop_offset;
+        char     origpath[PATH_MAX];
+        char     newpath[PATH_MAX];
+        int32_t  loop_count;
+        struct stat preparent;
+        struct stat postparent;
+};
+typedef struct trash_struct trash_local_t;
+
+struct _trash_elim_pattern;
+typedef struct _trash_elim_pattern {
+        struct _trash_elim_pattern *next;
+        char                       *pattern;
+} trash_elim_pattern_t;
+
+struct trash_priv {
+        char                 *trash_dir;
+        trash_elim_pattern_t *eliminate;
+        size_t                max_trash_file_size;
+};
+typedef struct trash_priv trash_private_t;
+
+#endif /* __TRASH_H__ */