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/*
* GPL HEADER START
*
* DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License version 2 only,
* as published by the Free Software Foundation.
*
* 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 version 2 for more details (a copy is included
* in the LICENSE file that accompanied this code).
*
* You should have received a copy of the GNU General Public License
* version 2 along with this program; if not, write to the
* Free Software Foundation, Inc., 59 Temple Place - Suite 330,
* Boston, MA 021110-1307, USA
*
* GPL HEADER END
*/
/*
* Copyright (c) 2012, Intel Corporation.
* Use is subject to license terms.
*
* Author: Johann Lombardi <johann.lombardi@intel.com>
*/
#include <lustre/lustre_idl.h>
#include <obd.h>
#include <md_object.h>
/**
* Initialize new \a lma. Only fid is stored.
*
* \param lma - is the new LMA structure to be initialized
* \param fid - is the FID of the object this LMA belongs to
* \param incompat - features that MDS must understand to access object
*/
void lustre_lma_init(struct lustre_mdt_attrs *lma, const struct lu_fid *fid,
__u32 incompat)
{
lma->lma_compat = 0;
lma->lma_incompat = incompat;
lma->lma_self_fid = *fid;
/* If a field is added in struct lustre_mdt_attrs, zero it explicitly
* and change the test below. */
LASSERT(sizeof(*lma) ==
(offsetof(struct lustre_mdt_attrs, lma_self_fid) +
sizeof(lma->lma_self_fid)));
};
EXPORT_SYMBOL(lustre_lma_init);
/**
* Swab, if needed, LMA structure which is stored on-disk in little-endian order.
*
* \param lma - is a pointer to the LMA structure to be swabbed.
*/
void lustre_lma_swab(struct lustre_mdt_attrs *lma)
{
/* Use LUSTRE_MSG_MAGIC to detect local endianness. */
if (LUSTRE_MSG_MAGIC != cpu_to_le32(LUSTRE_MSG_MAGIC)) {
__swab32s(&lma->lma_compat);
__swab32s(&lma->lma_incompat);
lustre_swab_lu_fid(&lma->lma_self_fid);
}
};
EXPORT_SYMBOL(lustre_lma_swab);
/**
* Swab, if needed, SOM structure which is stored on-disk in little-endian
* order.
*
* \param attrs - is a pointer to the SOM structure to be swabbed.
*/
void lustre_som_swab(struct som_attrs *attrs)
{
/* Use LUSTRE_MSG_MAGIC to detect local endianness. */
if (LUSTRE_MSG_MAGIC != cpu_to_le32(LUSTRE_MSG_MAGIC)) {
__swab32s(&attrs->som_compat);
__swab32s(&attrs->som_incompat);
__swab64s(&attrs->som_ioepoch);
__swab64s(&attrs->som_size);
__swab64s(&attrs->som_blocks);
__swab64s(&attrs->som_mountid);
}
};
EXPORT_SYMBOL(lustre_som_swab);
/*
* Swab and extract SOM attributes from on-disk xattr.
*
* \param buf - is a buffer containing the on-disk SOM extended attribute.
* \param rc - is the SOM xattr stored in \a buf
* \param msd - is the md_som_data structure where to extract SOM attributes.
*/
int lustre_buf2som(void *buf, int rc, struct md_som_data *msd)
{
struct som_attrs *attrs = (struct som_attrs *)buf;
if (rc == 0 || rc == -ENODATA)
/* no SOM attributes */
return -ENODATA;
if (rc < 0)
/* error hit while fetching xattr */
return rc;
/* check SOM compatibility */
if (attrs->som_incompat & ~cpu_to_le32(SOM_INCOMPAT_SUPP))
return -ENODATA;
/* unpack SOM attributes */
lustre_som_swab(attrs);
/* fill in-memory msd structure */
msd->msd_compat = attrs->som_compat;
msd->msd_incompat = attrs->som_incompat;
msd->msd_ioepoch = attrs->som_ioepoch;
msd->msd_size = attrs->som_size;
msd->msd_blocks = attrs->som_blocks;
msd->msd_mountid = attrs->som_mountid;
return 0;
}
EXPORT_SYMBOL(lustre_buf2som);
/**
* Swab, if needed, HSM structure which is stored on-disk in little-endian
* order.
*
* \param attrs - is a pointer to the HSM structure to be swabbed.
*/
void lustre_hsm_swab(struct hsm_attrs *attrs)
{
/* Use LUSTRE_MSG_MAGIC to detect local endianness. */
if (LUSTRE_MSG_MAGIC != cpu_to_le32(LUSTRE_MSG_MAGIC)) {
__swab32s(&attrs->hsm_compat);
__swab32s(&attrs->hsm_flags);
__swab64s(&attrs->hsm_arch_id);
__swab64s(&attrs->hsm_arch_ver);
}
};
EXPORT_SYMBOL(lustre_hsm_swab);
/*
* Swab and extract HSM attributes from on-disk xattr.
*
* \param buf - is a buffer containing the on-disk HSM extended attribute.
* \param rc - is the HSM xattr stored in \a buf
* \param mh - is the md_hsm structure where to extract HSM attributes.
*/
int lustre_buf2hsm(void *buf, int rc, struct md_hsm *mh)
{
struct hsm_attrs *attrs = (struct hsm_attrs *)buf;
if (rc == 0 || rc == -ENODATA)
/* no HSM attributes */
return -ENODATA;
if (rc < 0)
/* error hit while fetching xattr */
return rc;
/* unpack HSM attributes */
lustre_hsm_swab(attrs);
/* fill md_hsm structure */
mh->mh_compat = attrs->hsm_compat;
mh->mh_flags = attrs->hsm_flags;
mh->mh_arch_id = attrs->hsm_arch_id;
mh->mh_arch_ver = attrs->hsm_arch_ver;
return 0;
}
EXPORT_SYMBOL(lustre_buf2hsm);
/*
* Pack HSM attributes.
*
* \param buf - is the output buffer where to pack the on-disk HSM xattr.
* \param mh - is the md_hsm structure to pack.
*/
void lustre_hsm2buf(void *buf, struct md_hsm *mh)
{
struct hsm_attrs *attrs = (struct hsm_attrs *)buf;
/* copy HSM attributes */
attrs->hsm_compat = mh->mh_compat;
attrs->hsm_flags = mh->mh_flags;
attrs->hsm_arch_id = mh->mh_arch_id;
attrs->hsm_arch_ver = mh->mh_arch_ver;
/* pack xattr */
lustre_hsm_swab(attrs);
}
EXPORT_SYMBOL(lustre_hsm2buf);
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