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Diffstat (limited to 'drivers/staging/lustre/lustre/obdclass/dt_object.c')
-rw-r--r--drivers/staging/lustre/lustre/obdclass/dt_object.c1054
1 files changed, 0 insertions, 1054 deletions
diff --git a/drivers/staging/lustre/lustre/obdclass/dt_object.c b/drivers/staging/lustre/lustre/obdclass/dt_object.c
deleted file mode 100644
index b67b0feb03e0..000000000000
--- a/drivers/staging/lustre/lustre/obdclass/dt_object.c
+++ /dev/null
@@ -1,1054 +0,0 @@
-/*
- * 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"
-
-/* 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);
-
-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);
Copyright © 1996 – 2023 Jason A. Donenfeld. All Rights Reverse Engineered.