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local.c
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local.c
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/**
* Copyright (c) 2009 Ma Can <ml.macana@gmail.com>
* <macan@ncic.ac.cn>
*
* Armed with EMACS.
* Time-stamp: <2011-03-02 13:13:17 macan>
*
* This program 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 2 of the License, or
* (at your option) any later version.
*
* This program 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, write to the Free Software
* Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
*
*/
#include "hvfs.h"
#include "xnet.h"
#include "mdsl_api.h"
#include "mdsl.h"
int __mdsl_read_local(struct storage_index *si,
struct iovec **oiov)
{
struct fdhash_entry *fde;
struct mdsl_storage_access msa;
struct iovec *iov;
int err = 0, i;
hvfs_debug(mdsl, "Recv read request %ld veclen %d from self\n",
si->sic.uuid, si->scd.cnr);
/* we should iterate on the client's column_req vector and read each entry
* to the result buffer */
iov = xzalloc(sizeof(struct iovec) * si->scd.cnr);
if (!iov) {
hvfs_err(mdsl, "xzalloc() iovec failed.\n");
return -ENOMEM;
}
for (i = 0; i < si->scd.cnr; i++) {
/* prepare to get the data file */
fde = mdsl_storage_fd_lookup_create(si->sic.uuid, MDSL_STORAGE_DATA,
si->scd.cr[i].cno);
if (IS_ERR(fde)) {
hvfs_err(mdsl, "lookup create %ld data column %ld failed w/ %ld\n",
si->sic.uuid, si->scd.cr[i].cno, PTR_ERR(fde));
err = PTR_ERR(fde);
goto out_free;
}
/* prepare the data region */
iov[i].iov_base = xmalloc(si->scd.cr[i].req_len);
if (!iov[i].iov_base) {
hvfs_err(mdsl, "xmalloc data column %ld storage failed.\n",
si->scd.cr[i].cno);
mdsl_storage_fd_put(fde);
err = -ENOMEM;
goto out_free;
}
iov[i].iov_len = si->scd.cr[i].req_len;
/* read the data now */
msa.offset = si->scd.cr[i].file_offset + si->scd.cr[i].req_offset;
msa.iov = &iov[i];
msa.iov_nr = 1;
err = mdsl_storage_fd_read(fde, &msa);
if (err) {
hvfs_err(mdsl, "read the dir %ld data column %ld "
"offset %ld len %ld failed w/ %d\n",
si->sic.uuid, si->scd.cr[i].cno,
si->scd.cr[i].req_offset,
si->scd.cr[i].req_len, err);
mdsl_storage_fd_put(fde);
goto out_free;
}
/* put the fde */
mdsl_storage_fd_put(fde);
}
*oiov = iov;
return 0;
out_free:
for (i = 0; i < si->scd.cnr; i++) {
if (iov[i].iov_base)
xfree(iov[i].iov_base);
}
xfree(iov);
return err;
}
int __mdsl_write_local(struct storage_index *si, void *data,
u64 **olocation)
{
struct fdhash_entry *fde;
struct mdsl_storage_access msa;
struct iovec iov;
u64 offset = 0;
u64 *location;
int err = 0, i;
hvfs_debug(mdsl, "Recv write request %ld veclen %d from self\n",
si->sic.uuid, si->scd.cnr);
/* We should iterate on the client's column_req vector and write each
* entry to the result buffer */
location = xzalloc(sizeof(u64) * si->scd.cnr);
if (!location) {
hvfs_err(mdsl, "xzalloc() location failed.\n");
return -ENOMEM;
}
for (i = 0; i < si->scd.cnr; i++) {
/* prepare to get the data file */
fde = mdsl_storage_fd_lookup_create(si->sic.uuid, MDSL_STORAGE_DATA,
si->scd.cr[i].cno);
if (unlikely(IS_ERR(fde))) {
hvfs_err(mdsl, "lookup create %ld data column %ld failed w/ %ld\n",
si->sic.uuid, si->scd.cr[i].cno, PTR_ERR(fde));
err = PTR_ERR(fde);
goto out_free;
}
/* write the data now */
iov.iov_base = data + offset;
iov.iov_len = si->scd.cr[i].req_len;
offset += iov.iov_len;
msa.arg = location + i;
msa.iov = &iov;
msa.iov_nr = 1;
err = mdsl_storage_fd_write(fde, &msa);
if (err) {
hvfs_err(mdsl, "write the dir %ld data column %ld failed w/ %d\n",
si->sic.uuid, si->scd.cr[i].cno, err);
mdsl_storage_fd_put(fde);
goto out_free;
}
/* put the fde */
mdsl_storage_fd_put(fde);
/* accumulate to hmi */
atomic64_add(iov.iov_len, &hmi.mi_bused);
}
*olocation = location;
return 0;
out_free:
/* free the location array */
xfree(location);
return err;
}