diff options
Diffstat (limited to 'drivers/staging/lustre/lustre/obdclass/md_attrs.c')
| -rw-r--r-- | drivers/staging/lustre/lustre/obdclass/md_attrs.c | 202 |
1 files changed, 202 insertions, 0 deletions
diff --git a/drivers/staging/lustre/lustre/obdclass/md_attrs.c b/drivers/staging/lustre/lustre/obdclass/md_attrs.c new file mode 100644 index 000000000000..b71344a04c7e --- /dev/null +++ b/drivers/staging/lustre/lustre/obdclass/md_attrs.c @@ -0,0 +1,202 @@ +/* + * 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 endianess. */ + 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 endianess. */ + 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; + ENTRY; + + 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 endianess. */ + 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; + ENTRY; + + 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; + ENTRY; + + /* 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); |