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/*
Copyright (c) 2015 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 "arbiter.h"
#include "arbiter-mem-types.h"
#include "glusterfs.h"
#include "xlator.h"
#include "logging.h"
static arbiter_inode_ctx_t *
__arbiter_inode_ctx_get (inode_t *inode, xlator_t *this)
{
arbiter_inode_ctx_t *ctx = NULL;
int ret = 0;
uint64_t ctx_addr = 0;
ret = __inode_ctx_get (inode, this, &ctx_addr);
if (ret == 0) {
ctx = (arbiter_inode_ctx_t *) (long) ctx_addr;
goto out;
}
ctx = GF_CALLOC (1, sizeof (*ctx), gf_arbiter_mt_inode_ctx_t);
if (!ctx)
goto out;
ret = __inode_ctx_put (inode, this, (uint64_t)ctx);
if (ret) {
GF_FREE (ctx);
ctx = NULL;
gf_log_callingfn (this->name, GF_LOG_ERROR, "failed to "
"set the inode ctx (%s)",
uuid_utoa (inode->gfid));
}
out:
return ctx;
}
static arbiter_inode_ctx_t *
arbiter_inode_ctx_get (inode_t *inode, xlator_t *this)
{
arbiter_inode_ctx_t *ctx = NULL;
LOCK(&inode->lock);
{
ctx = __arbiter_inode_ctx_get (inode, this);
}
UNLOCK(&inode->lock);
return ctx;
}
int32_t
arbiter_lookup_cbk (call_frame_t *frame, void *cookie, xlator_t *this,
int32_t op_ret, int32_t op_errno, inode_t *inode,
struct iatt *buf, dict_t *xdata, struct iatt *postparent)
{
arbiter_inode_ctx_t *ctx = NULL;
if (op_ret != 0)
goto unwind;
ctx = arbiter_inode_ctx_get (inode, this);
if (!ctx) {
op_ret = -1;
op_errno = ENOMEM;
goto unwind;
}
memcpy (&ctx->iattbuf, buf, sizeof (ctx->iattbuf));
unwind:
STACK_UNWIND_STRICT (lookup, frame, op_ret, op_errno, inode, buf,
xdata, postparent);
return 0;
}
int32_t
arbiter_lookup (call_frame_t *frame, xlator_t *this, loc_t *loc, dict_t *xdata)
{
STACK_WIND (frame, arbiter_lookup_cbk, FIRST_CHILD(this),
FIRST_CHILD(this)->fops->lookup, loc, xdata);
return 0;
}
int32_t
arbiter_readv (call_frame_t *frame, xlator_t *this, fd_t *fd, size_t size,
off_t offset, uint32_t flags, dict_t *xdata)
{
STACK_UNWIND_STRICT (readv, frame, -1, ENOTCONN, NULL, 0, NULL, NULL,
NULL);
return 0;
}
int32_t
arbiter_truncate (call_frame_t *frame, xlator_t *this, loc_t *loc, off_t offset,
dict_t *xdata)
{
arbiter_inode_ctx_t *ctx = NULL;
struct iatt *buf = NULL;
int32_t op_ret = 0;
int32_t op_errno = 0;
ctx = arbiter_inode_ctx_get (loc->inode, this);
if (!ctx) {
op_ret = -1;
op_errno = ENOMEM;
goto unwind;
}
buf = &ctx->iattbuf;
unwind:
STACK_UNWIND_STRICT (truncate, frame, op_ret, op_errno, buf, buf, NULL);
return 0;
}
int32_t
arbiter_ftruncate (call_frame_t *frame, xlator_t *this, fd_t *fd, off_t offset,
dict_t *xdata)
{
arbiter_inode_ctx_t *ctx = NULL;
struct iatt *buf = NULL;
int32_t op_ret = 0;
int32_t op_errno = 0;
ctx = arbiter_inode_ctx_get (fd->inode, this);
if (!ctx) {
op_ret = -1;
op_errno = ENOMEM;
goto unwind;
}
buf = &ctx->iattbuf;
unwind:
STACK_UNWIND_STRICT (ftruncate, frame, op_ret, op_errno, buf, buf,
NULL);
return 0;
}
dict_t*
arbiter_fill_writev_xdata (fd_t *fd, dict_t *xdata, xlator_t *this)
{
dict_t *rsp_xdata = NULL;
int32_t ret = 0;
int is_append = 1;
if (!fd || !fd->inode || gf_uuid_is_null (fd->inode->gfid)) {
goto out;
}
if (!xdata)
goto out;
rsp_xdata = dict_new();
if (!rsp_xdata)
goto out;
if (dict_get (xdata, GLUSTERFS_OPEN_FD_COUNT)) {
ret = dict_set_uint32 (rsp_xdata, GLUSTERFS_OPEN_FD_COUNT,
fd->inode->fd_count);
if (ret < 0) {
gf_msg_debug (this->name, 0, "Failed to set dict value"
" for GLUSTERFS_OPEN_FD_COUNT");
}
}
if (dict_get (xdata, GLUSTERFS_WRITE_IS_APPEND)) {
ret = dict_set_uint32 (rsp_xdata, GLUSTERFS_WRITE_IS_APPEND,
is_append);
if (ret < 0) {
gf_msg_debug (this->name, 0, "Failed to set dict value"
" for GLUSTERFS_WRITE_IS_APPEND");
}
}
out:
return rsp_xdata;
}
int32_t
arbiter_writev (call_frame_t *frame, xlator_t *this, fd_t *fd,
struct iovec *vector, int32_t count, off_t off, uint32_t flags,
struct iobref *iobref, dict_t *xdata)
{
arbiter_inode_ctx_t *ctx = NULL;
struct iatt *buf = NULL;
dict_t *rsp_xdata = NULL;
int op_ret = 0;
int op_errno = 0;
ctx = arbiter_inode_ctx_get (fd->inode, this);
if (!ctx) {
op_ret = -1;
op_errno = ENOMEM;
goto unwind;
}
buf = &ctx->iattbuf;
op_ret = iov_length (vector, count);
rsp_xdata = arbiter_fill_writev_xdata (fd, xdata, this);
unwind:
STACK_UNWIND_STRICT (writev, frame, op_ret, op_errno, buf, buf,
rsp_xdata);
if (rsp_xdata)
dict_unref (rsp_xdata);
return 0;
}
int32_t
arbiter_fallocate (call_frame_t *frame, xlator_t *this, fd_t *fd,
int32_t keep_size, off_t offset, size_t len, dict_t *xdata)
{
arbiter_inode_ctx_t *ctx = NULL;
struct iatt *buf = NULL;
int op_ret = 0;
int op_errno = 0;
ctx = arbiter_inode_ctx_get (fd->inode, this);
if (!ctx) {
op_ret = -1;
op_errno = ENOMEM;
goto unwind;
}
buf = &ctx->iattbuf;
unwind:
STACK_UNWIND_STRICT(fallocate, frame, op_ret, op_errno, buf, buf, NULL);
return 0;
}
int32_t
arbiter_discard (call_frame_t *frame, xlator_t *this, fd_t *fd,
off_t offset, size_t len, dict_t *xdata)
{
arbiter_inode_ctx_t *ctx = NULL;
struct iatt *buf = NULL;
int op_ret = 0;
int op_errno = 0;
ctx = arbiter_inode_ctx_get (fd->inode, this);
if (!ctx) {
op_ret = -1;
op_errno = ENOMEM;
goto unwind;
}
buf = &ctx->iattbuf;
unwind:
STACK_UNWIND_STRICT(discard, frame, op_ret, op_errno, buf, buf, NULL);
return 0;
}
int32_t
arbiter_zerofill (call_frame_t *frame, xlator_t *this, fd_t *fd,
off_t offset, off_t len, dict_t *xdata)
{
arbiter_inode_ctx_t *ctx = NULL;
struct iatt *buf = NULL;
int op_ret = 0;
int op_errno = 0;
ctx = arbiter_inode_ctx_get (fd->inode, this);
if (!ctx) {
op_ret = -1;
op_errno = ENOMEM;
goto unwind;
}
buf = &ctx->iattbuf;
unwind:
STACK_UNWIND_STRICT(zerofill, frame, op_ret, op_errno, buf, buf, NULL);
return 0;
}
int32_t
mem_acct_init (xlator_t *this)
{
int ret = -1;
ret = xlator_mem_acct_init (this, gf_arbiter_mt_end + 1);
if (ret)
gf_log (this->name, GF_LOG_ERROR, "Memory accounting "
"initialization failed.");
return ret;
}
int
reconfigure (xlator_t *this, dict_t *options)
{
return 0;
}
int
arbiter_forget (xlator_t *this, inode_t *inode)
{
arbiter_inode_ctx_t *ctx = NULL;
uint64_t ctx_addr = 0;
inode_ctx_del (inode, this, &ctx_addr);
if (!ctx_addr)
return 0;
ctx = (arbiter_inode_ctx_t *) (long) ctx_addr;
GF_FREE (ctx);
return 0;
}
int32_t
init (xlator_t *this)
{
if (!this->children || this->children->next) {
gf_log (this->name, GF_LOG_ERROR,
"'arbiter' not configured with exactly one child");
return -1;
}
if (!this->parents)
gf_log (this->name, GF_LOG_ERROR,
"dangling volume. check volfile ");
return 0;
}
void
fini (xlator_t *this)
{
return;
}
struct xlator_fops fops = {
.lookup = arbiter_lookup,
.readv = arbiter_readv,
.truncate = arbiter_truncate,
.writev = arbiter_writev,
.ftruncate = arbiter_ftruncate,
.fallocate = arbiter_fallocate,
.discard = arbiter_discard,
.zerofill = arbiter_zerofill,
};
struct xlator_cbks cbks = {
.forget = arbiter_forget,
};
struct volume_options options[] = {
{ .key = {NULL} },
};
|
