+++ /dev/null
-/*
- * 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) 2013, Intel Corporation.
- * Use is subject to license terms.
- *
- * Author: di wang <di.wang@intel.com>
- */
-
-struct linkea_data {
- /**
- * Buffer to keep link EA body.
- */
- struct lu_buf *ld_buf;
- /**
- * The matched header, entry and its length in the EA
- */
- struct link_ea_header *ld_leh;
- struct link_ea_entry *ld_lee;
- int ld_reclen;
-};
-
-int linkea_data_new(struct linkea_data *ldata, struct lu_buf *buf);
-int linkea_init(struct linkea_data *ldata);
-void linkea_entry_unpack(const struct link_ea_entry *lee, int *reclen,
- struct lu_name *lname, struct lu_fid *pfid);
-int linkea_add_buf(struct linkea_data *ldata, const struct lu_name *lname,
- const struct lu_fid *pfid);
-void linkea_del_buf(struct linkea_data *ldata, const struct lu_name *lname);
-int linkea_links_find(struct linkea_data *ldata, const struct lu_name *lname,
- const struct lu_fid *pfid);
-
-#define LINKEA_NEXT_ENTRY(ldata) \
- (struct link_ea_entry *)((char *)ldata.ld_lee + ldata.ld_reclen)
-
-#define LINKEA_FIRST_ENTRY(ldata) \
- (struct link_ea_entry *)(ldata.ld_leh + 1)
+++ /dev/null
-/*
- * 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) 2013, Intel Corporation.
- * Use is subject to license terms.
- *
- * Author: Di Wang <di.wang@intel.com>
- */
-
-#include "../include/lustre/lustre_idl.h"
-#include "../include/obd.h"
-#include "../include/lustre_linkea.h"
-
-int linkea_data_new(struct linkea_data *ldata, struct lu_buf *buf)
-{
- ldata->ld_buf = lu_buf_check_and_alloc(buf, PAGE_CACHE_SIZE);
- if (ldata->ld_buf->lb_buf == NULL)
- return -ENOMEM;
- ldata->ld_leh = ldata->ld_buf->lb_buf;
- ldata->ld_leh->leh_magic = LINK_EA_MAGIC;
- ldata->ld_leh->leh_len = sizeof(struct link_ea_header);
- ldata->ld_leh->leh_reccount = 0;
- return 0;
-}
-EXPORT_SYMBOL(linkea_data_new);
-
-int linkea_init(struct linkea_data *ldata)
-{
- struct link_ea_header *leh;
-
- LASSERT(ldata->ld_buf != NULL);
- leh = ldata->ld_buf->lb_buf;
- if (leh->leh_magic == __swab32(LINK_EA_MAGIC)) {
- leh->leh_magic = LINK_EA_MAGIC;
- leh->leh_reccount = __swab32(leh->leh_reccount);
- leh->leh_len = __swab64(leh->leh_len);
- /* entries are swabbed by linkea_entry_unpack */
- }
- if (leh->leh_magic != LINK_EA_MAGIC)
- return -EINVAL;
- if (leh->leh_reccount == 0)
- return -ENODATA;
-
- ldata->ld_leh = leh;
- return 0;
-}
-EXPORT_SYMBOL(linkea_init);
-
-/**
- * Pack a link_ea_entry.
- * All elements are stored as chars to avoid alignment issues.
- * Numbers are always big-endian
- * \retval record length
- */
-static int linkea_entry_pack(struct link_ea_entry *lee,
- const struct lu_name *lname,
- const struct lu_fid *pfid)
-{
- struct lu_fid tmpfid;
- int reclen;
-
- fid_cpu_to_be(&tmpfid, pfid);
- if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_LINKEA_CRASH))
- tmpfid.f_ver = ~0;
- memcpy(&lee->lee_parent_fid, &tmpfid, sizeof(tmpfid));
- memcpy(lee->lee_name, lname->ln_name, lname->ln_namelen);
- reclen = sizeof(struct link_ea_entry) + lname->ln_namelen;
-
- lee->lee_reclen[0] = (reclen >> 8) & 0xff;
- lee->lee_reclen[1] = reclen & 0xff;
- return reclen;
-}
-
-void linkea_entry_unpack(const struct link_ea_entry *lee, int *reclen,
- struct lu_name *lname, struct lu_fid *pfid)
-{
- *reclen = (lee->lee_reclen[0] << 8) | lee->lee_reclen[1];
- memcpy(pfid, &lee->lee_parent_fid, sizeof(*pfid));
- fid_be_to_cpu(pfid, pfid);
- lname->ln_name = lee->lee_name;
- lname->ln_namelen = *reclen - sizeof(struct link_ea_entry);
-}
-EXPORT_SYMBOL(linkea_entry_unpack);
-
-/**
- * Add a record to the end of link ea buf
- **/
-int linkea_add_buf(struct linkea_data *ldata, const struct lu_name *lname,
- const struct lu_fid *pfid)
-{
- LASSERT(ldata->ld_leh != NULL);
-
- if (lname == NULL || pfid == NULL)
- return -EINVAL;
-
- ldata->ld_reclen = lname->ln_namelen + sizeof(struct link_ea_entry);
- if (ldata->ld_leh->leh_len + ldata->ld_reclen >
- ldata->ld_buf->lb_len) {
- if (lu_buf_check_and_grow(ldata->ld_buf,
- ldata->ld_leh->leh_len +
- ldata->ld_reclen) < 0)
- return -ENOMEM;
- }
-
- ldata->ld_leh = ldata->ld_buf->lb_buf;
- ldata->ld_lee = ldata->ld_buf->lb_buf + ldata->ld_leh->leh_len;
- ldata->ld_reclen = linkea_entry_pack(ldata->ld_lee, lname, pfid);
- ldata->ld_leh->leh_len += ldata->ld_reclen;
- ldata->ld_leh->leh_reccount++;
- CDEBUG(D_INODE, "New link_ea name '%.*s' is added\n",
- lname->ln_namelen, lname->ln_name);
- return 0;
-}
-EXPORT_SYMBOL(linkea_add_buf);
-
-/** Del the current record from the link ea buf */
-void linkea_del_buf(struct linkea_data *ldata, const struct lu_name *lname)
-{
- LASSERT(ldata->ld_leh != NULL && ldata->ld_lee != NULL);
-
- ldata->ld_leh->leh_reccount--;
- ldata->ld_leh->leh_len -= ldata->ld_reclen;
- memmove(ldata->ld_lee, (char *)ldata->ld_lee + ldata->ld_reclen,
- (char *)ldata->ld_leh + ldata->ld_leh->leh_len -
- (char *)ldata->ld_lee);
- CDEBUG(D_INODE, "Old link_ea name '%.*s' is removed\n",
- lname->ln_namelen, lname->ln_name);
-}
-EXPORT_SYMBOL(linkea_del_buf);
-
-/**
- * Check if such a link exists in linkEA.
- *
- * \param ldata link data the search to be done on
- * \param lname name in the parent's directory entry pointing to this object
- * \param pfid parent fid the link to be found for
- *
- * \retval 0 success
- * \retval -ENOENT link does not exist
- * \retval -ve on error
- */
-int linkea_links_find(struct linkea_data *ldata, const struct lu_name *lname,
- const struct lu_fid *pfid)
-{
- struct lu_name tmpname;
- struct lu_fid tmpfid;
- int count;
-
- LASSERT(ldata->ld_leh != NULL);
-
- /* link #0 */
- ldata->ld_lee = (struct link_ea_entry *)(ldata->ld_leh + 1);
-
- for (count = 0; count < ldata->ld_leh->leh_reccount; count++) {
- linkea_entry_unpack(ldata->ld_lee, &ldata->ld_reclen,
- &tmpname, &tmpfid);
- if (tmpname.ln_namelen == lname->ln_namelen &&
- lu_fid_eq(&tmpfid, pfid) &&
- (strncmp(tmpname.ln_name, lname->ln_name,
- tmpname.ln_namelen) == 0))
- break;
- ldata->ld_lee = (struct link_ea_entry *)((char *)ldata->ld_lee +
- ldata->ld_reclen);
- }
-
- if (count == ldata->ld_leh->leh_reccount) {
- CDEBUG(D_INODE, "Old link_ea name '%.*s' not found\n",
- lname->ln_namelen, lname->ln_name);
- ldata->ld_lee = NULL;
- return -ENOENT;
- }
- return 0;
-}
-EXPORT_SYMBOL(linkea_links_find);
projects / openwrt / staging / blogic.git / commitdiff