--- /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.sun.com/software/products/lustre/docs/GPLv2.pdf
+ *
+ * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
+ * CA 95054 USA or visit www.sun.com if you need additional information or
+ * have any questions.
+ *
+ * GPL HEADER END
+ */
+/*
+ * Copyright (c) 2007, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
+ *
+ * Copyright (c) 2011, 2012, Intel Corporation.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
+ *
+ * lustre/obdclass/dt_object.c
+ *
+ * Dt Object.
+ * Generic functions from dt_object.h
+ *
+ * Author: Nikita Danilov <nikita@clusterfs.com>
+ */
+
+#define DEBUG_SUBSYSTEM S_CLASS
+
+#include "../include/obd.h"
+#include "../include/dt_object.h"
+#include <linux/list.h>
+/* fid_be_to_cpu() */
+#include "../include/lustre_fid.h"
+
+#include "../include/lustre_quota.h"
+
+/* context key constructor/destructor: dt_global_key_init, dt_global_key_fini */
+LU_KEY_INIT(dt_global, struct dt_thread_info);
+LU_KEY_FINI(dt_global, struct dt_thread_info);
+
+struct lu_context_key dt_key = {
+ .lct_tags = LCT_MD_THREAD | LCT_DT_THREAD | LCT_MG_THREAD | LCT_LOCAL,
+ .lct_init = dt_global_key_init,
+ .lct_fini = dt_global_key_fini
+};
+EXPORT_SYMBOL(dt_key);
+
+/* no lock is necessary to protect the list, because call-backs
+ * are added during system startup. Please refer to "struct dt_device".
+ */
+void dt_txn_callback_add(struct dt_device *dev, struct dt_txn_callback *cb)
+{
+ list_add(&cb->dtc_linkage, &dev->dd_txn_callbacks);
+}
+EXPORT_SYMBOL(dt_txn_callback_add);
+
+void dt_txn_callback_del(struct dt_device *dev, struct dt_txn_callback *cb)
+{
+ list_del_init(&cb->dtc_linkage);
+}
+EXPORT_SYMBOL(dt_txn_callback_del);
+
+int dt_txn_hook_start(const struct lu_env *env,
+ struct dt_device *dev, struct thandle *th)
+{
+ int rc = 0;
+ struct dt_txn_callback *cb;
+
+ if (th->th_local)
+ return 0;
+
+ list_for_each_entry(cb, &dev->dd_txn_callbacks, dtc_linkage) {
+ if (cb->dtc_txn_start == NULL ||
+ !(cb->dtc_tag & env->le_ctx.lc_tags))
+ continue;
+ rc = cb->dtc_txn_start(env, th, cb->dtc_cookie);
+ if (rc < 0)
+ break;
+ }
+ return rc;
+}
+EXPORT_SYMBOL(dt_txn_hook_start);
+
+int dt_txn_hook_stop(const struct lu_env *env, struct thandle *txn)
+{
+ struct dt_device *dev = txn->th_dev;
+ struct dt_txn_callback *cb;
+ int rc = 0;
+
+ if (txn->th_local)
+ return 0;
+
+ list_for_each_entry(cb, &dev->dd_txn_callbacks, dtc_linkage) {
+ if (cb->dtc_txn_stop == NULL ||
+ !(cb->dtc_tag & env->le_ctx.lc_tags))
+ continue;
+ rc = cb->dtc_txn_stop(env, txn, cb->dtc_cookie);
+ if (rc < 0)
+ break;
+ }
+ return rc;
+}
+EXPORT_SYMBOL(dt_txn_hook_stop);
+
+void dt_txn_hook_commit(struct thandle *txn)
+{
+ struct dt_txn_callback *cb;
+
+ if (txn->th_local)
+ return;
+
+ list_for_each_entry(cb, &txn->th_dev->dd_txn_callbacks,
+ dtc_linkage) {
+ if (cb->dtc_txn_commit)
+ cb->dtc_txn_commit(txn, cb->dtc_cookie);
+ }
+}
+EXPORT_SYMBOL(dt_txn_hook_commit);
+
+int dt_device_init(struct dt_device *dev, struct lu_device_type *t)
+{
+
+ INIT_LIST_HEAD(&dev->dd_txn_callbacks);
+ return lu_device_init(&dev->dd_lu_dev, t);
+}
+EXPORT_SYMBOL(dt_device_init);
+
+void dt_device_fini(struct dt_device *dev)
+{
+ lu_device_fini(&dev->dd_lu_dev);
+}
+EXPORT_SYMBOL(dt_device_fini);
+
+int dt_object_init(struct dt_object *obj,
+ struct lu_object_header *h, struct lu_device *d)
+
+{
+ return lu_object_init(&obj->do_lu, h, d);
+}
+EXPORT_SYMBOL(dt_object_init);
+
+void dt_object_fini(struct dt_object *obj)
+{
+ lu_object_fini(&obj->do_lu);
+}
+EXPORT_SYMBOL(dt_object_fini);
+
+int dt_try_as_dir(const struct lu_env *env, struct dt_object *obj)
+{
+ if (obj->do_index_ops == NULL)
+ obj->do_ops->do_index_try(env, obj, &dt_directory_features);
+ return obj->do_index_ops != NULL;
+}
+EXPORT_SYMBOL(dt_try_as_dir);
+
+enum dt_format_type dt_mode_to_dft(__u32 mode)
+{
+ enum dt_format_type result;
+
+ switch (mode & S_IFMT) {
+ case S_IFDIR:
+ result = DFT_DIR;
+ break;
+ case S_IFREG:
+ result = DFT_REGULAR;
+ break;
+ case S_IFLNK:
+ result = DFT_SYM;
+ break;
+ case S_IFCHR:
+ case S_IFBLK:
+ case S_IFIFO:
+ case S_IFSOCK:
+ result = DFT_NODE;
+ break;
+ default:
+ LBUG();
+ break;
+ }
+ return result;
+}
+EXPORT_SYMBOL(dt_mode_to_dft);
+
+/**
+ * lookup fid for object named \a name in directory \a dir.
+ */
+
+int dt_lookup_dir(const struct lu_env *env, struct dt_object *dir,
+ const char *name, struct lu_fid *fid)
+{
+ if (dt_try_as_dir(env, dir))
+ return dt_lookup(env, dir, (struct dt_rec *)fid,
+ (const struct dt_key *)name, BYPASS_CAPA);
+ return -ENOTDIR;
+}
+EXPORT_SYMBOL(dt_lookup_dir);
+
+/* this differs from dt_locate by top_dev as parameter
+ * but not one from lu_site */
+struct dt_object *dt_locate_at(const struct lu_env *env,
+ struct dt_device *dev, const struct lu_fid *fid,
+ struct lu_device *top_dev)
+{
+ struct lu_object *lo, *n;
+
+ lo = lu_object_find_at(env, top_dev, fid, NULL);
+ if (IS_ERR(lo))
+ return (void *)lo;
+
+ LASSERT(lo != NULL);
+
+ list_for_each_entry(n, &lo->lo_header->loh_layers, lo_linkage) {
+ if (n->lo_dev == &dev->dd_lu_dev)
+ return container_of0(n, struct dt_object, do_lu);
+ }
+ return ERR_PTR(-ENOENT);
+}
+EXPORT_SYMBOL(dt_locate_at);
+
+/**
+ * find a object named \a entry in given \a dfh->dfh_o directory.
+ */
+static int dt_find_entry(const struct lu_env *env, const char *entry, void *data)
+{
+ struct dt_find_hint *dfh = data;
+ struct dt_device *dt = dfh->dfh_dt;
+ struct lu_fid *fid = dfh->dfh_fid;
+ struct dt_object *obj = dfh->dfh_o;
+ int result;
+
+ result = dt_lookup_dir(env, obj, entry, fid);
+ lu_object_put(env, &obj->do_lu);
+ if (result == 0) {
+ obj = dt_locate(env, dt, fid);
+ if (IS_ERR(obj))
+ result = PTR_ERR(obj);
+ }
+ dfh->dfh_o = obj;
+ return result;
+}
+
+/**
+ * Abstract function which parses path name. This function feeds
+ * path component to \a entry_func.
+ */
+int dt_path_parser(const struct lu_env *env,
+ char *path, dt_entry_func_t entry_func,
+ void *data)
+{
+ char *e;
+ int rc = 0;
+
+ while (1) {
+ e = strsep(&path, "/");
+ if (e == NULL)
+ break;
+
+ if (e[0] == 0) {
+ if (!path || path[0] == '\0')
+ break;
+ continue;
+ }
+ rc = entry_func(env, e, data);
+ if (rc)
+ break;
+ }
+
+ return rc;
+}
+
+struct dt_object *
+dt_store_resolve(const struct lu_env *env, struct dt_device *dt,
+ const char *path, struct lu_fid *fid)
+{
+ struct dt_thread_info *info = dt_info(env);
+ struct dt_find_hint *dfh = &info->dti_dfh;
+ struct dt_object *obj;
+ char *local = info->dti_buf;
+ int result;
+
+
+ dfh->dfh_dt = dt;
+ dfh->dfh_fid = fid;
+
+ strncpy(local, path, DT_MAX_PATH);
+ local[DT_MAX_PATH - 1] = '\0';
+
+ result = dt->dd_ops->dt_root_get(env, dt, fid);
+ if (result == 0) {
+ obj = dt_locate(env, dt, fid);
+ if (!IS_ERR(obj)) {
+ dfh->dfh_o = obj;
+ result = dt_path_parser(env, local, dt_find_entry, dfh);
+ if (result != 0)
+ obj = ERR_PTR(result);
+ else
+ obj = dfh->dfh_o;
+ }
+ } else {
+ obj = ERR_PTR(result);
+ }
+ return obj;
+}
+EXPORT_SYMBOL(dt_store_resolve);
+
+static struct dt_object *dt_reg_open(const struct lu_env *env,
+ struct dt_device *dt,
+ struct dt_object *p,
+ const char *name,
+ struct lu_fid *fid)
+{
+ struct dt_object *o;
+ int result;
+
+ result = dt_lookup_dir(env, p, name, fid);
+ if (result == 0){
+ o = dt_locate(env, dt, fid);
+ } else
+ o = ERR_PTR(result);
+
+ return o;
+}
+
+/**
+ * Open dt object named \a filename from \a dirname directory.
+ * \param dt dt device
+ * \param fid on success, object fid is stored in *fid
+ */
+struct dt_object *dt_store_open(const struct lu_env *env,
+ struct dt_device *dt,
+ const char *dirname,
+ const char *filename,
+ struct lu_fid *fid)
+{
+ struct dt_object *file;
+ struct dt_object *dir;
+
+ dir = dt_store_resolve(env, dt, dirname, fid);
+ if (!IS_ERR(dir)) {
+ file = dt_reg_open(env, dt, dir,
+ filename, fid);
+ lu_object_put(env, &dir->do_lu);
+ } else {
+ file = dir;
+ }
+ return file;
+}
+EXPORT_SYMBOL(dt_store_open);
+
+struct dt_object *dt_find_or_create(const struct lu_env *env,
+ struct dt_device *dt,
+ const struct lu_fid *fid,
+ struct dt_object_format *dof,
+ struct lu_attr *at)
+{
+ struct dt_object *dto;
+ struct thandle *th;
+ int rc;
+
+ dto = dt_locate(env, dt, fid);
+ if (IS_ERR(dto))
+ return dto;
+
+ LASSERT(dto != NULL);
+ if (dt_object_exists(dto))
+ return dto;
+
+ th = dt_trans_create(env, dt);
+ if (IS_ERR(th)) {
+ rc = PTR_ERR(th);
+ goto out;
+ }
+
+ rc = dt_declare_create(env, dto, at, NULL, dof, th);
+ if (rc)
+ goto trans_stop;
+
+ rc = dt_trans_start_local(env, dt, th);
+ if (rc)
+ goto trans_stop;
+
+ dt_write_lock(env, dto, 0);
+ if (dt_object_exists(dto)) {
+ rc = 0;
+ goto unlock;
+ }
+
+ CDEBUG(D_OTHER, "create new object "DFID"\n", PFID(fid));
+
+ rc = dt_create(env, dto, at, NULL, dof, th);
+ if (rc)
+ goto unlock;
+ LASSERT(dt_object_exists(dto));
+unlock:
+ dt_write_unlock(env, dto);
+trans_stop:
+ dt_trans_stop(env, dt, th);
+out:
+ if (rc) {
+ lu_object_put(env, &dto->do_lu);
+ return ERR_PTR(rc);
+ }
+ return dto;
+}
+EXPORT_SYMBOL(dt_find_or_create);
+
+/* dt class init function. */
+int dt_global_init(void)
+{
+ LU_CONTEXT_KEY_INIT(&dt_key);
+ return lu_context_key_register(&dt_key);
+}
+
+void dt_global_fini(void)
+{
+ lu_context_key_degister(&dt_key);
+}
+
+/**
+ * Generic read helper. May return an error for partial reads.
+ *
+ * \param env lustre environment
+ * \param dt object to be read
+ * \param buf lu_buf to be filled, with buffer pointer and length
+ * \param pos position to start reading, updated as data is read
+ *
+ * \retval real size of data read
+ * \retval -ve errno on failure
+ */
+int dt_read(const struct lu_env *env, struct dt_object *dt,
+ struct lu_buf *buf, loff_t *pos)
+{
+ LASSERTF(dt != NULL, "dt is NULL when we want to read record\n");
+ return dt->do_body_ops->dbo_read(env, dt, buf, pos, BYPASS_CAPA);
+}
+EXPORT_SYMBOL(dt_read);
+
+/**
+ * Read structures of fixed size from storage. Unlike dt_read(), using
+ * dt_record_read() will return an error for partial reads.
+ *
+ * \param env lustre environment
+ * \param dt object to be read
+ * \param buf lu_buf to be filled, with buffer pointer and length
+ * \param pos position to start reading, updated as data is read
+ *
+ * \retval 0 on successfully reading full buffer
+ * \retval -EFAULT on short read
+ * \retval -ve errno on failure
+ */
+int dt_record_read(const struct lu_env *env, struct dt_object *dt,
+ struct lu_buf *buf, loff_t *pos)
+{
+ int rc;
+
+ LASSERTF(dt != NULL, "dt is NULL when we want to read record\n");
+
+ rc = dt->do_body_ops->dbo_read(env, dt, buf, pos, BYPASS_CAPA);
+
+ if (rc == buf->lb_len)
+ rc = 0;
+ else if (rc >= 0)
+ rc = -EFAULT;
+ return rc;
+}
+EXPORT_SYMBOL(dt_record_read);
+
+int dt_record_write(const struct lu_env *env, struct dt_object *dt,
+ const struct lu_buf *buf, loff_t *pos, struct thandle *th)
+{
+ int rc;
+
+ LASSERTF(dt != NULL, "dt is NULL when we want to write record\n");
+ LASSERT(th != NULL);
+ LASSERT(dt->do_body_ops);
+ LASSERT(dt->do_body_ops->dbo_write);
+ rc = dt->do_body_ops->dbo_write(env, dt, buf, pos, th, BYPASS_CAPA, 1);
+ if (rc == buf->lb_len)
+ rc = 0;
+ else if (rc >= 0)
+ rc = -EFAULT;
+ return rc;
+}
+EXPORT_SYMBOL(dt_record_write);
+
+int dt_declare_version_set(const struct lu_env *env, struct dt_object *o,
+ struct thandle *th)
+{
+ struct lu_buf vbuf;
+ char *xname = XATTR_NAME_VERSION;
+
+ LASSERT(o);
+ vbuf.lb_buf = NULL;
+ vbuf.lb_len = sizeof(dt_obj_version_t);
+ return dt_declare_xattr_set(env, o, &vbuf, xname, 0, th);
+
+}
+EXPORT_SYMBOL(dt_declare_version_set);
+
+void dt_version_set(const struct lu_env *env, struct dt_object *o,
+ dt_obj_version_t version, struct thandle *th)
+{
+ struct lu_buf vbuf;
+ char *xname = XATTR_NAME_VERSION;
+ int rc;
+
+ LASSERT(o);
+ vbuf.lb_buf = &version;
+ vbuf.lb_len = sizeof(version);
+
+ rc = dt_xattr_set(env, o, &vbuf, xname, 0, th, BYPASS_CAPA);
+ if (rc < 0)
+ CDEBUG(D_INODE, "Can't set version, rc %d\n", rc);
+ return;
+}
+EXPORT_SYMBOL(dt_version_set);
+
+dt_obj_version_t dt_version_get(const struct lu_env *env, struct dt_object *o)
+{
+ struct lu_buf vbuf;
+ char *xname = XATTR_NAME_VERSION;
+ dt_obj_version_t version;
+ int rc;
+
+ LASSERT(o);
+ vbuf.lb_buf = &version;
+ vbuf.lb_len = sizeof(version);
+ rc = dt_xattr_get(env, o, &vbuf, xname, BYPASS_CAPA);
+ if (rc != sizeof(version)) {
+ CDEBUG(D_INODE, "Can't get version, rc %d\n", rc);
+ version = 0;
+ }
+ return version;
+}
+EXPORT_SYMBOL(dt_version_get);
+
+/* list of all supported index types */
+
+/* directories */
+const struct dt_index_features dt_directory_features;
+EXPORT_SYMBOL(dt_directory_features);
+
+/* scrub iterator */
+const struct dt_index_features dt_otable_features;
+EXPORT_SYMBOL(dt_otable_features);
+
+/* lfsck */
+const struct dt_index_features dt_lfsck_features = {
+ .dif_flags = DT_IND_UPDATE,
+ .dif_keysize_min = sizeof(struct lu_fid),
+ .dif_keysize_max = sizeof(struct lu_fid),
+ .dif_recsize_min = sizeof(__u8),
+ .dif_recsize_max = sizeof(__u8),
+ .dif_ptrsize = 4
+};
+EXPORT_SYMBOL(dt_lfsck_features);
+
+/* accounting indexes */
+const struct dt_index_features dt_acct_features = {
+ .dif_flags = DT_IND_UPDATE,
+ .dif_keysize_min = sizeof(__u64), /* 64-bit uid/gid */
+ .dif_keysize_max = sizeof(__u64), /* 64-bit uid/gid */
+ .dif_recsize_min = sizeof(struct lquota_acct_rec), /* 16 bytes */
+ .dif_recsize_max = sizeof(struct lquota_acct_rec), /* 16 bytes */
+ .dif_ptrsize = 4
+};
+EXPORT_SYMBOL(dt_acct_features);
+
+/* global quota files */
+const struct dt_index_features dt_quota_glb_features = {
+ .dif_flags = DT_IND_UPDATE,
+ /* a different key would have to be used for per-directory quota */
+ .dif_keysize_min = sizeof(__u64), /* 64-bit uid/gid */
+ .dif_keysize_max = sizeof(__u64), /* 64-bit uid/gid */
+ .dif_recsize_min = sizeof(struct lquota_glb_rec), /* 32 bytes */
+ .dif_recsize_max = sizeof(struct lquota_glb_rec), /* 32 bytes */
+ .dif_ptrsize = 4
+};
+EXPORT_SYMBOL(dt_quota_glb_features);
+
+/* slave quota files */
+const struct dt_index_features dt_quota_slv_features = {
+ .dif_flags = DT_IND_UPDATE,
+ /* a different key would have to be used for per-directory quota */
+ .dif_keysize_min = sizeof(__u64), /* 64-bit uid/gid */
+ .dif_keysize_max = sizeof(__u64), /* 64-bit uid/gid */
+ .dif_recsize_min = sizeof(struct lquota_slv_rec), /* 8 bytes */
+ .dif_recsize_max = sizeof(struct lquota_slv_rec), /* 8 bytes */
+ .dif_ptrsize = 4
+};
+EXPORT_SYMBOL(dt_quota_slv_features);
+
+/* helper function returning what dt_index_features structure should be used
+ * based on the FID sequence. This is used by OBD_IDX_READ RPC */
+static inline const struct dt_index_features *dt_index_feat_select(__u64 seq,
+ __u32 mode)
+{
+ if (seq == FID_SEQ_QUOTA_GLB) {
+ /* global quota index */
+ if (!S_ISREG(mode))
+ /* global quota index should be a regular file */
+ return ERR_PTR(-ENOENT);
+ return &dt_quota_glb_features;
+ } else if (seq == FID_SEQ_QUOTA) {
+ /* quota slave index */
+ if (!S_ISREG(mode))
+ /* slave index should be a regular file */
+ return ERR_PTR(-ENOENT);
+ return &dt_quota_slv_features;
+ } else if (seq >= FID_SEQ_NORMAL) {
+ /* object is part of the namespace, verify that it is a
+ * directory */
+ if (!S_ISDIR(mode))
+ /* sorry, we can only deal with directory */
+ return ERR_PTR(-ENOTDIR);
+ return &dt_directory_features;
+ }
+
+ return ERR_PTR(-EOPNOTSUPP);
+}
+
+/*
+ * Fill a lu_idxpage with key/record pairs read for transfer via OBD_IDX_READ
+ * RPC
+ *
+ * \param env - is the environment passed by the caller
+ * \param lp - is a pointer to the lu_page to fill
+ * \param nob - is the maximum number of bytes that should be copied
+ * \param iops - is the index operation vector associated with the index object
+ * \param it - is a pointer to the current iterator
+ * \param attr - is the index attribute to pass to iops->rec()
+ * \param arg - is a pointer to the idx_info structure
+ */
+static int dt_index_page_build(const struct lu_env *env, union lu_page *lp,
+ int nob, const struct dt_it_ops *iops,
+ struct dt_it *it, __u32 attr, void *arg)
+{
+ struct idx_info *ii = (struct idx_info *)arg;
+ struct lu_idxpage *lip = &lp->lp_idx;
+ char *entry;
+ int rc, size;
+
+ /* no support for variable key & record size for now */
+ LASSERT((ii->ii_flags & II_FL_VARKEY) == 0);
+ LASSERT((ii->ii_flags & II_FL_VARREC) == 0);
+
+ /* initialize the header of the new container */
+ memset(lip, 0, LIP_HDR_SIZE);
+ lip->lip_magic = LIP_MAGIC;
+ nob -= LIP_HDR_SIZE;
+
+ /* compute size needed to store a key/record pair */
+ size = ii->ii_recsize + ii->ii_keysize;
+ if ((ii->ii_flags & II_FL_NOHASH) == 0)
+ /* add hash if the client wants it */
+ size += sizeof(__u64);
+
+ entry = lip->lip_entries;
+ do {
+ char *tmp_entry = entry;
+ struct dt_key *key;
+ __u64 hash;
+
+ /* fetch 64-bit hash value */
+ hash = iops->store(env, it);
+ ii->ii_hash_end = hash;
+
+ if (OBD_FAIL_CHECK(OBD_FAIL_OBD_IDX_READ_BREAK)) {
+ if (lip->lip_nr != 0) {
+ rc = 0;
+ goto out;
+ }
+ }
+
+ if (nob < size) {
+ if (lip->lip_nr == 0)
+ rc = -EINVAL;
+ else
+ rc = 0;
+ goto out;
+ }
+
+ if ((ii->ii_flags & II_FL_NOHASH) == 0) {
+ /* client wants to the 64-bit hash value associated with
+ * each record */
+ memcpy(tmp_entry, &hash, sizeof(hash));
+ tmp_entry += sizeof(hash);
+ }
+
+ /* then the key value */
+ LASSERT(iops->key_size(env, it) == ii->ii_keysize);
+ key = iops->key(env, it);
+ memcpy(tmp_entry, key, ii->ii_keysize);
+ tmp_entry += ii->ii_keysize;
+
+ /* and finally the record */
+ rc = iops->rec(env, it, (struct dt_rec *)tmp_entry, attr);
+ if (rc != -ESTALE) {
+ if (rc != 0)
+ goto out;
+
+ /* hash/key/record successfully copied! */
+ lip->lip_nr++;
+ if (unlikely(lip->lip_nr == 1 && ii->ii_count == 0))
+ ii->ii_hash_start = hash;
+ entry = tmp_entry + ii->ii_recsize;
+ nob -= size;
+ }
+
+ /* move on to the next record */
+ do {
+ rc = iops->next(env, it);
+ } while (rc == -ESTALE);
+
+ } while (rc == 0);
+
+ goto out;
+out:
+ if (rc >= 0 && lip->lip_nr > 0)
+ /* one more container */
+ ii->ii_count++;
+ if (rc > 0)
+ /* no more entries */
+ ii->ii_hash_end = II_END_OFF;
+ return rc;
+}
+
+/*
+ * Walk index and fill lu_page containers with key/record pairs
+ *
+ * \param env - is the environment passed by the caller
+ * \param obj - is the index object to parse
+ * \param rdpg - is the lu_rdpg descriptor associated with the transfer
+ * \param filler - is the callback function responsible for filling a lu_page
+ * with key/record pairs in the format wanted by the caller
+ * \param arg - is an opaq argument passed to the filler function
+ *
+ * \retval sum (in bytes) of all filled lu_pages
+ * \retval -ve errno on failure
+ */
+int dt_index_walk(const struct lu_env *env, struct dt_object *obj,
+ const struct lu_rdpg *rdpg, dt_index_page_build_t filler,
+ void *arg)
+{
+ struct dt_it *it;
+ const struct dt_it_ops *iops;
+ unsigned int pageidx, nob, nlupgs = 0;
+ int rc;
+
+ LASSERT(rdpg->rp_pages != NULL);
+ LASSERT(obj->do_index_ops != NULL);
+
+ nob = rdpg->rp_count;
+ if (nob <= 0)
+ return -EFAULT;
+
+ /* Iterate through index and fill containers from @rdpg */
+ iops = &obj->do_index_ops->dio_it;
+ LASSERT(iops != NULL);
+ it = iops->init(env, obj, rdpg->rp_attrs, BYPASS_CAPA);
+ if (IS_ERR(it))
+ return PTR_ERR(it);
+
+ rc = iops->load(env, it, rdpg->rp_hash);
+ if (rc == 0) {
+ /*
+ * Iterator didn't find record with exactly the key requested.
+ *
+ * It is currently either
+ *
+ * - positioned above record with key less than
+ * requested---skip it.
+ * - or not positioned at all (is in IAM_IT_SKEWED
+ * state)---position it on the next item.
+ */
+ rc = iops->next(env, it);
+ } else if (rc > 0) {
+ rc = 0;
+ }
+
+ /* Fill containers one after the other. There might be multiple
+ * containers per physical page.
+ *
+ * At this point and across for-loop:
+ * rc == 0 -> ok, proceed.
+ * rc > 0 -> end of index.
+ * rc < 0 -> error. */
+ for (pageidx = 0; rc == 0 && nob > 0; pageidx++) {
+ union lu_page *lp;
+ int i;
+
+ LASSERT(pageidx < rdpg->rp_npages);
+ lp = kmap(rdpg->rp_pages[pageidx]);
+
+ /* fill lu pages */
+ for (i = 0; i < LU_PAGE_COUNT; i++, lp++, nob -= LU_PAGE_SIZE) {
+ rc = filler(env, lp, min_t(int, nob, LU_PAGE_SIZE),
+ iops, it, rdpg->rp_attrs, arg);
+ if (rc < 0)
+ break;
+ /* one more lu_page */
+ nlupgs++;
+ if (rc > 0)
+ /* end of index */
+ break;
+ }
+ kunmap(rdpg->rp_pages[i]);
+ }
+
+ iops->put(env, it);
+ iops->fini(env, it);
+
+ if (rc >= 0)
+ rc = min_t(unsigned int, nlupgs * LU_PAGE_SIZE, rdpg->rp_count);
+
+ return rc;
+}
+EXPORT_SYMBOL(dt_index_walk);
+
+/**
+ * Walk key/record pairs of an index and copy them into 4KB containers to be
+ * transferred over the network. This is the common handler for OBD_IDX_READ
+ * RPC processing.
+ *
+ * \param env - is the environment passed by the caller
+ * \param dev - is the dt_device storing the index
+ * \param ii - is the idx_info structure packed by the client in the
+ * OBD_IDX_READ request
+ * \param rdpg - is the lu_rdpg descriptor
+ *
+ * \retval on success, return sum (in bytes) of all filled containers
+ * \retval appropriate error otherwise.
+ */
+int dt_index_read(const struct lu_env *env, struct dt_device *dev,
+ struct idx_info *ii, const struct lu_rdpg *rdpg)
+{
+ const struct dt_index_features *feat;
+ struct dt_object *obj;
+ int rc;
+
+ /* rp_count shouldn't be null and should be a multiple of the container
+ * size */
+ if (rdpg->rp_count <= 0 && (rdpg->rp_count & (LU_PAGE_SIZE - 1)) != 0)
+ return -EFAULT;
+
+ if (fid_seq(&ii->ii_fid) >= FID_SEQ_NORMAL)
+ /* we don't support directory transfer via OBD_IDX_READ for the
+ * time being */
+ return -EOPNOTSUPP;
+
+ if (!fid_is_quota(&ii->ii_fid))
+ /* block access to all local files except quota files */
+ return -EPERM;
+
+ /* lookup index object subject to the transfer */
+ obj = dt_locate(env, dev, &ii->ii_fid);
+ if (IS_ERR(obj))
+ return PTR_ERR(obj);
+ if (dt_object_exists(obj) == 0) {
+ rc = -ENOENT;
+ goto out;
+ }
+
+ /* fetch index features associated with index object */
+ feat = dt_index_feat_select(fid_seq(&ii->ii_fid),
+ lu_object_attr(&obj->do_lu));
+ if (IS_ERR(feat)) {
+ rc = PTR_ERR(feat);
+ goto out;
+ }
+
+ /* load index feature if not done already */
+ if (obj->do_index_ops == NULL) {
+ rc = obj->do_ops->do_index_try(env, obj, feat);
+ if (rc)
+ goto out;
+ }
+
+ /* fill ii_flags with supported index features */
+ ii->ii_flags &= II_FL_NOHASH;
+
+ ii->ii_keysize = feat->dif_keysize_max;
+ if ((feat->dif_flags & DT_IND_VARKEY) != 0) {
+ /* key size is variable */
+ ii->ii_flags |= II_FL_VARKEY;
+ /* we don't support variable key size for the time being */
+ rc = -EOPNOTSUPP;
+ goto out;
+ }
+
+ ii->ii_recsize = feat->dif_recsize_max;
+ if ((feat->dif_flags & DT_IND_VARREC) != 0) {
+ /* record size is variable */
+ ii->ii_flags |= II_FL_VARREC;
+ /* we don't support variable record size for the time being */
+ rc = -EOPNOTSUPP;
+ goto out;
+ }
+
+ if ((feat->dif_flags & DT_IND_NONUNQ) != 0)
+ /* key isn't necessarily unique */
+ ii->ii_flags |= II_FL_NONUNQ;
+
+ dt_read_lock(env, obj, 0);
+ /* fetch object version before walking the index */
+ ii->ii_version = dt_version_get(env, obj);
+
+ /* walk the index and fill lu_idxpages with key/record pairs */
+ rc = dt_index_walk(env, obj, rdpg, dt_index_page_build ,ii);
+ dt_read_unlock(env, obj);
+
+ if (rc == 0) {
+ /* index is empty */
+ LASSERT(ii->ii_count == 0);
+ ii->ii_hash_end = II_END_OFF;
+ }
+
+ goto out;
+out:
+ lu_object_put(env, &obj->do_lu);
+ return rc;
+}
+EXPORT_SYMBOL(dt_index_read);
+
+#if defined (CONFIG_PROC_FS)
+
+int lprocfs_dt_rd_blksize(char *page, char **start, off_t off,
+ int count, int *eof, void *data)
+{
+ struct dt_device *dt = data;
+ struct obd_statfs osfs;
+ int rc = dt_statfs(NULL, dt, &osfs);
+
+ if (rc == 0) {
+ *eof = 1;
+ rc = snprintf(page, count, "%u\n",
+ (unsigned) osfs.os_bsize);
+ }
+
+ return rc;
+}
+EXPORT_SYMBOL(lprocfs_dt_rd_blksize);
+
+int lprocfs_dt_rd_kbytestotal(char *page, char **start, off_t off,
+ int count, int *eof, void *data)
+{
+ struct dt_device *dt = data;
+ struct obd_statfs osfs;
+ int rc = dt_statfs(NULL, dt, &osfs);
+
+ if (rc == 0) {
+ __u32 blk_size = osfs.os_bsize >> 10;
+ __u64 result = osfs.os_blocks;
+
+ while (blk_size >>= 1)
+ result <<= 1;
+
+ *eof = 1;
+ rc = snprintf(page, count, "%llu\n", result);
+ }
+
+ return rc;
+}
+EXPORT_SYMBOL(lprocfs_dt_rd_kbytestotal);
+
+int lprocfs_dt_rd_kbytesfree(char *page, char **start, off_t off,
+ int count, int *eof, void *data)
+{
+ struct dt_device *dt = data;
+ struct obd_statfs osfs;
+ int rc = dt_statfs(NULL, dt, &osfs);
+
+ if (rc == 0) {
+ __u32 blk_size = osfs.os_bsize >> 10;
+ __u64 result = osfs.os_bfree;
+
+ while (blk_size >>= 1)
+ result <<= 1;
+
+ *eof = 1;
+ rc = snprintf(page, count, "%llu\n", result);
+ }
+
+ return rc;
+}
+EXPORT_SYMBOL(lprocfs_dt_rd_kbytesfree);
+
+int lprocfs_dt_rd_kbytesavail(char *page, char **start, off_t off,
+ int count, int *eof, void *data)
+{
+ struct dt_device *dt = data;
+ struct obd_statfs osfs;
+ int rc = dt_statfs(NULL, dt, &osfs);
+
+ if (rc == 0) {
+ __u32 blk_size = osfs.os_bsize >> 10;
+ __u64 result = osfs.os_bavail;
+
+ while (blk_size >>= 1)
+ result <<= 1;
+
+ *eof = 1;
+ rc = snprintf(page, count, "%llu\n", result);
+ }
+
+ return rc;
+}
+EXPORT_SYMBOL(lprocfs_dt_rd_kbytesavail);
+
+int lprocfs_dt_rd_filestotal(char *page, char **start, off_t off,
+ int count, int *eof, void *data)
+{
+ struct dt_device *dt = data;
+ struct obd_statfs osfs;
+ int rc = dt_statfs(NULL, dt, &osfs);
+
+ if (rc == 0) {
+ *eof = 1;
+ rc = snprintf(page, count, "%llu\n", osfs.os_files);
+ }
+
+ return rc;
+}
+EXPORT_SYMBOL(lprocfs_dt_rd_filestotal);
+
+int lprocfs_dt_rd_filesfree(char *page, char **start, off_t off,
+ int count, int *eof, void *data)
+{
+ struct dt_device *dt = data;
+ struct obd_statfs osfs;
+ int rc = dt_statfs(NULL, dt, &osfs);
+
+ if (rc == 0) {
+ *eof = 1;
+ rc = snprintf(page, count, "%llu\n", osfs.os_ffree);
+ }
+
+ return rc;
+}
+EXPORT_SYMBOL(lprocfs_dt_rd_filesfree);
+
+#endif /* CONFIG_PROC_FS */
Code Review / kvmfornfv.git / blobdiff