--- /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, see
+ * http://www.gnu.org/licenses/gpl-2.0.html
+ *
+ * GPL HEADER END
+ */
+/*
+ * Copyright (c) 2013, 2014, Intel Corporation.
+ * Use is subject to license terms.
+ *
+ * Author: di wang <di.wang@intel.com>
+ */
+
+#define DEFAULT_LINKEA_SIZE 4096
+
+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_entry_pack(struct link_ea_entry *lee, const struct lu_name *lname,
+ const 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);
+
+static inline void linkea_first_entry(struct linkea_data *ldata)
+{
+ LASSERT(ldata);
+ LASSERT(ldata->ld_leh);
+
+ if (ldata->ld_leh->leh_reccount == 0)
+ ldata->ld_lee = NULL;
+ else
+ ldata->ld_lee = (struct link_ea_entry *)(ldata->ld_leh + 1);
+}
+
+static inline void linkea_next_entry(struct linkea_data *ldata)
+{
+ LASSERT(ldata);
+ LASSERT(ldata->ld_leh);
+
+ if (ldata->ld_lee) {
+ ldata->ld_lee = (struct link_ea_entry *)((char *)ldata->ld_lee +
+ ldata->ld_reclen);
+ if ((char *)ldata->ld_lee >= ((char *)ldata->ld_leh +
+ ldata->ld_leh->leh_len))
+ ldata->ld_lee = NULL;
+ }
+}
--- /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, see
+ * http://www.gnu.org/licenses/gpl-2.0.html
+ *
+ * GPL HEADER END
+ */
+/*
+ * Copyright (c) 2013, 2014, 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_SIZE);
+ if (!ldata->ld_buf->lb_buf)
+ 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);
+ 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
+ */
+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;
+
+ tmpfid = *pfid;
+ if (OBD_FAIL_CHECK(OBD_FAIL_LFSCK_LINKEA_CRASH))
+ tmpfid.f_ver = ~0;
+ fid_cpu_to_be(&tmpfid, &tmpfid);
+ 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;
+}
+EXPORT_SYMBOL(linkea_entry_pack);
+
+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);
+ if (lname) {
+ 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);
+
+ if (!lname || !pfid)
+ 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 '" DFID ":%.*s' is added\n",
+ PFID(pfid), 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 && ldata->ld_lee);
+
+ 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);
+
+ if ((char *)ldata->ld_lee >= ((char *)ldata->ld_leh +
+ ldata->ld_leh->leh_len))
+ ldata->ld_lee = NULL;
+}
+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);
+
+ /* 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;
+ ldata->ld_reclen = 0;
+ return -ENOENT;
+ }
+ return 0;
+}
+EXPORT_SYMBOL(linkea_links_find);
}
}
EXPORT_SYMBOL(lu_kmem_fini);
+
+void lu_buf_free(struct lu_buf *buf)
+{
+ LASSERT(buf);
+ if (buf->lb_buf) {
+ LASSERT(buf->lb_len > 0);
+ kvfree(buf->lb_buf);
+ buf->lb_buf = NULL;
+ buf->lb_len = 0;
+ }
+}
+EXPORT_SYMBOL(lu_buf_free);
+
+void lu_buf_alloc(struct lu_buf *buf, size_t size)
+{
+ LASSERT(buf);
+ LASSERT(!buf->lb_buf);
+ LASSERT(!buf->lb_len);
+ buf->lb_buf = libcfs_kvzalloc(size, GFP_NOFS);
+ if (likely(buf->lb_buf))
+ buf->lb_len = size;
+}
+EXPORT_SYMBOL(lu_buf_alloc);
+
+void lu_buf_realloc(struct lu_buf *buf, size_t size)
+{
+ lu_buf_free(buf);
+ lu_buf_alloc(buf, size);
+}
+EXPORT_SYMBOL(lu_buf_realloc);
+
+struct lu_buf *lu_buf_check_and_alloc(struct lu_buf *buf, size_t len)
+{
+ if (!buf->lb_buf && !buf->lb_len)
+ lu_buf_alloc(buf, len);
+
+ if ((len > buf->lb_len) && buf->lb_buf)
+ lu_buf_realloc(buf, len);
+
+ return buf;
+}
+EXPORT_SYMBOL(lu_buf_check_and_alloc);
+
+/**
+ * Increase the size of the \a buf.
+ * preserves old data in buffer
+ * old buffer remains unchanged on error
+ * \retval 0 or -ENOMEM
+ */
+int lu_buf_check_and_grow(struct lu_buf *buf, size_t len)
+{
+ char *ptr;
+
+ if (len <= buf->lb_len)
+ return 0;
+
+ ptr = libcfs_kvzalloc(len, GFP_NOFS);
+ if (!ptr)
+ return -ENOMEM;
+
+ /* Free the old buf */
+ if (buf->lb_buf) {
+ memcpy(ptr, buf->lb_buf, buf->lb_len);
+ kvfree(buf->lb_buf);
+ }
+
+ buf->lb_buf = ptr;
+ buf->lb_len = len;
+ return 0;
+}
projects / users / hch / configfs.git / commitdiff