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/*
Copyright (c) 2009-2010 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/>.
*/
#include "quick-read.h"
int32_t
qr_lookup_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
int32_t op_ret, int32_t op_errno, inode_t *inode,
struct stat *buf, dict_t *dict)
{
data_t *content = NULL;
qr_file_t *qr_file = NULL;
uint64_t value = 0;
int ret = -1;
qr_conf_t *conf = NULL;
if ((op_ret == -1) || (dict == NULL)) {
goto out;
}
conf = this->private;
content = dict_get (dict, GLUSTERFS_CONTENT_KEY);
if (content == NULL) {
goto out;
}
if (buf->st_size > conf->max_file_size) {
goto out;
}
if (S_ISDIR (buf->st_mode)) {
goto out;
}
ret = inode_ctx_get (inode, this, &value);
if (ret == -1) {
qr_file = CALLOC (1, sizeof (*qr_file));
if (qr_file == NULL) {
op_ret = -1;
op_errno = ENOMEM;
goto out;
}
LOCK_INIT (&qr_file->lock);
inode_ctx_put (inode, this, (uint64_t)(long)qr_file);
} else {
qr_file = (qr_file_t *)(long)value;
if (qr_file == NULL) {
op_ret = -1;
op_errno = EINVAL;
goto out;
}
}
LOCK (&qr_file->lock);
{
if (qr_file->xattr) {
dict_unref (qr_file->xattr);
qr_file->xattr = NULL;
}
qr_file->xattr = dict_ref (dict);
qr_file->stbuf = *buf;
gettimeofday (&qr_file->tv, NULL);
}
UNLOCK (&qr_file->lock);
out:
STACK_UNWIND (frame, op_ret, op_errno, inode, buf, dict);
return 0;
}
int32_t
qr_lookup (call_frame_t *frame, xlator_t *this, loc_t *loc, dict_t *xattr_req)
{
qr_conf_t *conf = NULL;
dict_t *new_req_dict = NULL;
int32_t op_ret = -1, op_errno = -1;
data_t *content = NULL;
uint64_t requested_size = 0, size = 0;
conf = this->private;
if (conf == NULL) {
op_ret = -1;
op_errno = EINVAL;
goto unwind;
}
if ((xattr_req == NULL) && (conf->max_file_size > 0)) {
new_req_dict = xattr_req = dict_new ();
if (xattr_req == NULL) {
op_ret = -1;
op_errno = ENOMEM;
gf_log (this->name, GF_LOG_ERROR, "out of memory");
goto unwind;
}
}
if (xattr_req) {
content = dict_get (xattr_req, GLUSTERFS_CONTENT_KEY);
if (content) {
requested_size = data_to_uint64 (content);
}
}
if (((conf->max_file_size > 0) && (content == NULL))
|| (conf->max_file_size != requested_size)) {
size = (conf->max_file_size > requested_size) ?
conf->max_file_size : requested_size;
op_ret = dict_set (xattr_req, GLUSTERFS_CONTENT_KEY,
data_from_uint64 (size));
if (op_ret < 0) {
op_ret = -1;
op_errno = ENOMEM;
goto unwind;
}
}
STACK_WIND (frame, qr_lookup_cbk, FIRST_CHILD(this),
FIRST_CHILD(this)->fops->lookup, loc, xattr_req);
if (new_req_dict) {
dict_unref (new_req_dict);
}
return 0;
unwind:
STACK_UNWIND (frame, op_ret, op_errno, NULL, NULL, NULL);
if (new_req_dict) {
dict_unref (new_req_dict);
}
return 0;
}
int32_t
init (xlator_t *this)
{
char *str = NULL;
int32_t ret = -1;
qr_conf_t *conf = NULL;
if (!this->children || this->children->next) {
gf_log (this->name, GF_LOG_ERROR,
"FATAL: volume (%s) not configured with exactly one "
"child", this->name);
return -1;
}
if (!this->parents) {
gf_log (this->name, GF_LOG_WARNING,
"dangling volume. check volfile ");
}
conf = CALLOC (1, sizeof (*conf));
if (conf == NULL) {
gf_log (this->name, GF_LOG_ERROR,
"out of memory");
ret = -1;
goto out;
}
ret = dict_get_str (this->options, "max-file-size",
&str);
if (ret == 0) {
ret = gf_string2bytesize (str, &conf->max_file_size);
if (ret != 0) {
gf_log (this->name, GF_LOG_ERROR,
"invalid number format \"%s\" of \"option "
"max-file-size\"",
str);
ret = -1;
goto out;
}
}
conf->cache_timeout = -1;
ret = dict_get_str (this->options, "cache-timeout", &str);
if (ret == 0) {
ret = gf_string2uint_base10 (str,
(unsigned int *)&conf->cache_timeout);
if (ret != 0) {
gf_log (this->name, GF_LOG_ERROR,
"invalid cache-timeout value %s", str);
ret = -1;
goto out;
}
}
this->private = conf;
out:
if ((ret == -1) && conf) {
FREE (conf);
}
return ret;
}
void
fini (xlator_t *this)
{
return;
}
struct xlator_fops fops = {
.lookup = qr_lookup,
};
struct xlator_mops mops = {
};
struct xlator_cbks cbks = {
};
struct volume_options options[] = {
{ .key = {"cache-timeout"},
.type = GF_OPTION_TYPE_INT,
.min = 1,
.max = 60
},
{ .key = {"max-file-size"},
.type = GF_OPTION_TYPE_SIZET,
.min = 0,
.max = 1 * GF_UNIT_MB
},
};
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