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/*
Copyright (c) 2008-2012 Red Hat, Inc. <http://www.redhat.com>
This file is part of GlusterFS.
This file is licensed to you under your choice of the GNU Lesser
General Public License, version 3 or any later version (LGPLv3 or
later), or the GNU General Public License, version 2 (GPLv2), in all
cases as published by the Free Software Foundation.
*/
#include "xlator.h"
#include "defaults.h"
#include "read-only-common.h"
#include "read-only-mem-types.h"
#include "read-only.h"
int32_t
mem_acct_init (xlator_t *this)
{
int ret = -1;
ret = xlator_mem_acct_init (this, gf_read_only_mt_end + 1);
if (ret)
gf_log (this->name, GF_LOG_ERROR, "Memory accounting "
"initialization failed.");
return ret;
}
static int32_t
worm_open_cbk (call_frame_t *frame, void *cookie, xlator_t *this, int32_t op_ret,
int32_t op_errno, fd_t *fd, dict_t *xdata)
{
STACK_UNWIND_STRICT (open, frame, op_ret, op_errno, fd, xdata);
return 0;
}
int32_t
worm_open (call_frame_t *frame, xlator_t *this, loc_t *loc, int32_t flags,
fd_t *fd, dict_t *xdata)
{
if (is_readonly_or_worm_enabled (this) &&
((((flags & O_ACCMODE) == O_WRONLY) ||
((flags & O_ACCMODE) == O_RDWR)) &&
!(flags & O_APPEND))) {
STACK_UNWIND_STRICT (open, frame, -1, EROFS, NULL, NULL);
return 0;
}
STACK_WIND (frame, worm_open_cbk, FIRST_CHILD(this),
FIRST_CHILD(this)->fops->open, loc, flags, fd, xdata);
return 0;
}
int32_t
init (xlator_t *this)
{
int ret = -1;
read_only_priv_t *priv = NULL;
if (!this->children || this->children->next) {
gf_log (this->name, GF_LOG_ERROR,
"translator not configured with exactly one child");
return -1;
}
if (!this->parents) {
gf_log (this->name, GF_LOG_WARNING,
"dangling volume. check volfile ");
}
priv = GF_CALLOC (1, sizeof (*priv), gf_read_only_mt_priv_t);
if (!priv)
goto out;
GF_OPTION_INIT ("worm", priv->readonly_or_worm_enabled, bool, out);
this->private = priv;
ret = 0;
out:
return ret;
}
int
reconfigure (xlator_t *this, dict_t *options)
{
read_only_priv_t *priv = NULL;
int ret = -1;
gf_boolean_t readonly_or_worm_enabled = _gf_false;
priv = this->private;
GF_ASSERT (priv);
GF_OPTION_RECONF ("worm", readonly_or_worm_enabled, options, bool, out);
priv->readonly_or_worm_enabled = readonly_or_worm_enabled;
ret = 0;
out:
gf_log (this->name, GF_LOG_DEBUG, "returning %d", ret);
return ret;
}
void
fini (xlator_t *this)
{
read_only_priv_t *priv = NULL;
priv = this->private;
if (!priv)
return;
this->private = NULL;
GF_FREE (priv);
return;
}
struct xlator_fops fops = {
.open = worm_open,
.unlink = ro_unlink,
.rmdir = ro_rmdir,
.rename = ro_rename,
.truncate = ro_truncate,
.removexattr = ro_removexattr,
.fsyncdir = ro_fsyncdir,
.xattrop = ro_xattrop,
.inodelk = ro_inodelk,
.finodelk = ro_finodelk,
.entrylk = ro_entrylk,
.fentrylk = ro_fentrylk,
.lk = ro_lk,
};
struct xlator_cbks cbks;
struct volume_options options[] = {
{ .key = {"worm"},
.type = GF_OPTION_TYPE_BOOL,
.default_value = "off",
.description = "When \"on\", makes a volume get write once read many "
" feature. It is turned \"off\" by default."
},
};
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