--- /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) 2008, 2010, Oracle and/or its affiliates. All rights reserved.
+ * Use is subject to license terms.
+ *
+ * Copyright (c) 2012, Intel Corporation.
+ */
+/*
+ * This file is part of Lustre, http://www.lustre.org/
+ * Lustre is a trademark of Sun Microsystems, Inc.
+ *
+ * cl_device and cl_device_type implementation for VVP layer.
+ *
+ * Author: Nikita Danilov <nikita.danilov@sun.com>
+ */
+
+#define DEBUG_SUBSYSTEM S_LLITE
+
+
+#include "../include/obd.h"
+#include "../include/lustre_lite.h"
+#include "llite_internal.h"
+#include "vvp_internal.h"
+
+/*****************************************************************************
+ *
+ * Vvp device and device type functions.
+ *
+ */
+
+/*
+ * vvp_ prefix stands for "Vfs Vm Posix". It corresponds to historical
+ * "llite_" (var. "ll_") prefix.
+ */
+
+static struct kmem_cache *vvp_thread_kmem;
+static struct kmem_cache *vvp_session_kmem;
+static struct lu_kmem_descr vvp_caches[] = {
+ {
+ .ckd_cache = &vvp_thread_kmem,
+ .ckd_name = "vvp_thread_kmem",
+ .ckd_size = sizeof(struct vvp_thread_info),
+ },
+ {
+ .ckd_cache = &vvp_session_kmem,
+ .ckd_name = "vvp_session_kmem",
+ .ckd_size = sizeof(struct vvp_session)
+ },
+ {
+ .ckd_cache = NULL
+ }
+};
+
+static void *vvp_key_init(const struct lu_context *ctx,
+ struct lu_context_key *key)
+{
+ struct vvp_thread_info *info;
+
+ OBD_SLAB_ALLOC_PTR_GFP(info, vvp_thread_kmem, GFP_NOFS);
+ if (info == NULL)
+ info = ERR_PTR(-ENOMEM);
+ return info;
+}
+
+static void vvp_key_fini(const struct lu_context *ctx,
+ struct lu_context_key *key, void *data)
+{
+ struct vvp_thread_info *info = data;
+
+ OBD_SLAB_FREE_PTR(info, vvp_thread_kmem);
+}
+
+static void *vvp_session_key_init(const struct lu_context *ctx,
+ struct lu_context_key *key)
+{
+ struct vvp_session *session;
+
+ OBD_SLAB_ALLOC_PTR_GFP(session, vvp_session_kmem, GFP_NOFS);
+ if (session == NULL)
+ session = ERR_PTR(-ENOMEM);
+ return session;
+}
+
+static void vvp_session_key_fini(const struct lu_context *ctx,
+ struct lu_context_key *key, void *data)
+{
+ struct vvp_session *session = data;
+
+ OBD_SLAB_FREE_PTR(session, vvp_session_kmem);
+}
+
+
+struct lu_context_key vvp_key = {
+ .lct_tags = LCT_CL_THREAD,
+ .lct_init = vvp_key_init,
+ .lct_fini = vvp_key_fini
+};
+
+struct lu_context_key vvp_session_key = {
+ .lct_tags = LCT_SESSION,
+ .lct_init = vvp_session_key_init,
+ .lct_fini = vvp_session_key_fini
+};
+
+/* type constructor/destructor: vvp_type_{init,fini,start,stop}(). */
+LU_TYPE_INIT_FINI(vvp, &ccc_key, &ccc_session_key, &vvp_key, &vvp_session_key);
+
+static const struct lu_device_operations vvp_lu_ops = {
+ .ldo_object_alloc = vvp_object_alloc
+};
+
+static const struct cl_device_operations vvp_cl_ops = {
+ .cdo_req_init = ccc_req_init
+};
+
+static struct lu_device *vvp_device_alloc(const struct lu_env *env,
+ struct lu_device_type *t,
+ struct lustre_cfg *cfg)
+{
+ return ccc_device_alloc(env, t, cfg, &vvp_lu_ops, &vvp_cl_ops);
+}
+
+static const struct lu_device_type_operations vvp_device_type_ops = {
+ .ldto_init = vvp_type_init,
+ .ldto_fini = vvp_type_fini,
+
+ .ldto_start = vvp_type_start,
+ .ldto_stop = vvp_type_stop,
+
+ .ldto_device_alloc = vvp_device_alloc,
+ .ldto_device_free = ccc_device_free,
+ .ldto_device_init = ccc_device_init,
+ .ldto_device_fini = ccc_device_fini
+};
+
+struct lu_device_type vvp_device_type = {
+ .ldt_tags = LU_DEVICE_CL,
+ .ldt_name = LUSTRE_VVP_NAME,
+ .ldt_ops = &vvp_device_type_ops,
+ .ldt_ctx_tags = LCT_CL_THREAD
+};
+
+/**
+ * A mutex serializing calls to vvp_inode_fini() under extreme memory
+ * pressure, when environments cannot be allocated.
+ */
+int vvp_global_init(void)
+{
+ int result;
+
+ result = lu_kmem_init(vvp_caches);
+ if (result == 0) {
+ result = ccc_global_init(&vvp_device_type);
+ if (result != 0)
+ lu_kmem_fini(vvp_caches);
+ }
+ return result;
+}
+
+void vvp_global_fini(void)
+{
+ ccc_global_fini(&vvp_device_type);
+ lu_kmem_fini(vvp_caches);
+}
+
+
+/*****************************************************************************
+ *
+ * mirror obd-devices into cl devices.
+ *
+ */
+
+int cl_sb_init(struct super_block *sb)
+{
+ struct ll_sb_info *sbi;
+ struct cl_device *cl;
+ struct lu_env *env;
+ int rc = 0;
+ int refcheck;
+
+ sbi = ll_s2sbi(sb);
+ env = cl_env_get(&refcheck);
+ if (!IS_ERR(env)) {
+ cl = cl_type_setup(env, NULL, &vvp_device_type,
+ sbi->ll_dt_exp->exp_obd->obd_lu_dev);
+ if (!IS_ERR(cl)) {
+ cl2ccc_dev(cl)->cdv_sb = sb;
+ sbi->ll_cl = cl;
+ sbi->ll_site = cl2lu_dev(cl)->ld_site;
+ }
+ cl_env_put(env, &refcheck);
+ } else
+ rc = PTR_ERR(env);
+ return rc;
+}
+
+int cl_sb_fini(struct super_block *sb)
+{
+ struct ll_sb_info *sbi;
+ struct lu_env *env;
+ struct cl_device *cld;
+ int refcheck;
+ int result;
+
+ sbi = ll_s2sbi(sb);
+ env = cl_env_get(&refcheck);
+ if (!IS_ERR(env)) {
+ cld = sbi->ll_cl;
+
+ if (cld != NULL) {
+ cl_stack_fini(env, cld);
+ sbi->ll_cl = NULL;
+ sbi->ll_site = NULL;
+ }
+ cl_env_put(env, &refcheck);
+ result = 0;
+ } else {
+ CERROR("Cannot cleanup cl-stack due to memory shortage.\n");
+ result = PTR_ERR(env);
+ }
+ /*
+ * If mount failed (sbi->ll_cl == NULL), and this there are no other
+ * mounts, stop device types manually (this usually happens
+ * automatically when last device is destroyed).
+ */
+ lu_types_stop();
+ return result;
+}
+
+/****************************************************************************
+ *
+ * /proc/fs/lustre/llite/$MNT/dump_page_cache
+ *
+ ****************************************************************************/
+
+/*
+ * To represent contents of a page cache as a byte stream, following
+ * information if encoded in 64bit offset:
+ *
+ * - file hash bucket in lu_site::ls_hash[] 28bits
+ *
+ * - how far file is from bucket head 4bits
+ *
+ * - page index 32bits
+ *
+ * First two data identify a file in the cache uniquely.
+ */
+
+#define PGC_OBJ_SHIFT (32 + 4)
+#define PGC_DEPTH_SHIFT (32)
+
+struct vvp_pgcache_id {
+ unsigned vpi_bucket;
+ unsigned vpi_depth;
+ uint32_t vpi_index;
+
+ unsigned vpi_curdep;
+ struct lu_object_header *vpi_obj;
+};
+
+static void vvp_pgcache_id_unpack(loff_t pos, struct vvp_pgcache_id *id)
+{
+ CLASSERT(sizeof(pos) == sizeof(__u64));
+
+ id->vpi_index = pos & 0xffffffff;
+ id->vpi_depth = (pos >> PGC_DEPTH_SHIFT) & 0xf;
+ id->vpi_bucket = (unsigned long long)pos >> PGC_OBJ_SHIFT;
+}
+
+static loff_t vvp_pgcache_id_pack(struct vvp_pgcache_id *id)
+{
+ return
+ ((__u64)id->vpi_index) |
+ ((__u64)id->vpi_depth << PGC_DEPTH_SHIFT) |
+ ((__u64)id->vpi_bucket << PGC_OBJ_SHIFT);
+}
+
+static int vvp_pgcache_obj_get(struct cfs_hash *hs, struct cfs_hash_bd *bd,
+ struct hlist_node *hnode, void *data)
+{
+ struct vvp_pgcache_id *id = data;
+ struct lu_object_header *hdr = cfs_hash_object(hs, hnode);
+
+ if (id->vpi_curdep-- > 0)
+ return 0; /* continue */
+
+ if (lu_object_is_dying(hdr))
+ return 1;
+
+ cfs_hash_get(hs, hnode);
+ id->vpi_obj = hdr;
+ return 1;
+}
+
+static struct cl_object *vvp_pgcache_obj(const struct lu_env *env,
+ struct lu_device *dev,
+ struct vvp_pgcache_id *id)
+{
+ LASSERT(lu_device_is_cl(dev));
+
+ id->vpi_depth &= 0xf;
+ id->vpi_obj = NULL;
+ id->vpi_curdep = id->vpi_depth;
+
+ cfs_hash_hlist_for_each(dev->ld_site->ls_obj_hash, id->vpi_bucket,
+ vvp_pgcache_obj_get, id);
+ if (id->vpi_obj != NULL) {
+ struct lu_object *lu_obj;
+
+ lu_obj = lu_object_locate(id->vpi_obj, dev->ld_type);
+ if (lu_obj != NULL) {
+ lu_object_ref_add(lu_obj, "dump", current);
+ return lu2cl(lu_obj);
+ }
+ lu_object_put(env, lu_object_top(id->vpi_obj));
+
+ } else if (id->vpi_curdep > 0) {
+ id->vpi_depth = 0xf;
+ }
+ return NULL;
+}
+
+static loff_t vvp_pgcache_find(const struct lu_env *env,
+ struct lu_device *dev, loff_t pos)
+{
+ struct cl_object *clob;
+ struct lu_site *site;
+ struct vvp_pgcache_id id;
+
+ site = dev->ld_site;
+ vvp_pgcache_id_unpack(pos, &id);
+
+ while (1) {
+ if (id.vpi_bucket >= CFS_HASH_NHLIST(site->ls_obj_hash))
+ return ~0ULL;
+ clob = vvp_pgcache_obj(env, dev, &id);
+ if (clob != NULL) {
+ struct cl_object_header *hdr;
+ int nr;
+ struct cl_page *pg;
+
+ /* got an object. Find next page. */
+ hdr = cl_object_header(clob);
+
+ spin_lock(&hdr->coh_page_guard);
+ nr = radix_tree_gang_lookup(&hdr->coh_tree,
+ (void **)&pg,
+ id.vpi_index, 1);
+ if (nr > 0) {
+ id.vpi_index = pg->cp_index;
+ /* Cant support over 16T file */
+ nr = !(pg->cp_index > 0xffffffff);
+ }
+ spin_unlock(&hdr->coh_page_guard);
+
+ lu_object_ref_del(&clob->co_lu, "dump", current);
+ cl_object_put(env, clob);
+ if (nr > 0)
+ return vvp_pgcache_id_pack(&id);
+ }
+ /* to the next object. */
+ ++id.vpi_depth;
+ id.vpi_depth &= 0xf;
+ if (id.vpi_depth == 0 && ++id.vpi_bucket == 0)
+ return ~0ULL;
+ id.vpi_index = 0;
+ }
+}
+
+#define seq_page_flag(seq, page, flag, has_flags) do { \
+ if (test_bit(PG_##flag, &(page)->flags)) { \
+ seq_printf(seq, "%s"#flag, has_flags ? "|" : ""); \
+ has_flags = 1; \
+ } \
+} while (0)
+
+static void vvp_pgcache_page_show(const struct lu_env *env,
+ struct seq_file *seq, struct cl_page *page)
+{
+ struct ccc_page *cpg;
+ struct page *vmpage;
+ int has_flags;
+
+ cpg = cl2ccc_page(cl_page_at(page, &vvp_device_type));
+ vmpage = cpg->cpg_page;
+ seq_printf(seq, " %5i | %p %p %s %s %s %s | %p %lu/%u(%p) %lu %u [",
+ 0 /* gen */,
+ cpg, page,
+ "none",
+ cpg->cpg_write_queued ? "wq" : "- ",
+ cpg->cpg_defer_uptodate ? "du" : "- ",
+ PageWriteback(vmpage) ? "wb" : "-",
+ vmpage, vmpage->mapping->host->i_ino,
+ vmpage->mapping->host->i_generation,
+ vmpage->mapping->host, vmpage->index,
+ page_count(vmpage));
+ has_flags = 0;
+ seq_page_flag(seq, vmpage, locked, has_flags);
+ seq_page_flag(seq, vmpage, error, has_flags);
+ seq_page_flag(seq, vmpage, referenced, has_flags);
+ seq_page_flag(seq, vmpage, uptodate, has_flags);
+ seq_page_flag(seq, vmpage, dirty, has_flags);
+ seq_page_flag(seq, vmpage, writeback, has_flags);
+ seq_printf(seq, "%s]\n", has_flags ? "" : "-");
+}
+
+static int vvp_pgcache_show(struct seq_file *f, void *v)
+{
+ loff_t pos;
+ struct ll_sb_info *sbi;
+ struct cl_object *clob;
+ struct lu_env *env;
+ struct cl_page *page;
+ struct cl_object_header *hdr;
+ struct vvp_pgcache_id id;
+ int refcheck;
+ int result;
+
+ env = cl_env_get(&refcheck);
+ if (!IS_ERR(env)) {
+ pos = *(loff_t *) v;
+ vvp_pgcache_id_unpack(pos, &id);
+ sbi = f->private;
+ clob = vvp_pgcache_obj(env, &sbi->ll_cl->cd_lu_dev, &id);
+ if (clob != NULL) {
+ hdr = cl_object_header(clob);
+
+ spin_lock(&hdr->coh_page_guard);
+ page = cl_page_lookup(hdr, id.vpi_index);
+ spin_unlock(&hdr->coh_page_guard);
+
+ seq_printf(f, "%8x@"DFID": ",
+ id.vpi_index, PFID(&hdr->coh_lu.loh_fid));
+ if (page != NULL) {
+ vvp_pgcache_page_show(env, f, page);
+ cl_page_put(env, page);
+ } else
+ seq_puts(f, "missing\n");
+ lu_object_ref_del(&clob->co_lu, "dump", current);
+ cl_object_put(env, clob);
+ } else
+ seq_printf(f, "%llx missing\n", pos);
+ cl_env_put(env, &refcheck);
+ result = 0;
+ } else
+ result = PTR_ERR(env);
+ return result;
+}
+
+static void *vvp_pgcache_start(struct seq_file *f, loff_t *pos)
+{
+ struct ll_sb_info *sbi;
+ struct lu_env *env;
+ int refcheck;
+
+ sbi = f->private;
+
+ env = cl_env_get(&refcheck);
+ if (!IS_ERR(env)) {
+ sbi = f->private;
+ if (sbi->ll_site->ls_obj_hash->hs_cur_bits > 64 - PGC_OBJ_SHIFT)
+ pos = ERR_PTR(-EFBIG);
+ else {
+ *pos = vvp_pgcache_find(env, &sbi->ll_cl->cd_lu_dev,
+ *pos);
+ if (*pos == ~0ULL)
+ pos = NULL;
+ }
+ cl_env_put(env, &refcheck);
+ }
+ return pos;
+}
+
+static void *vvp_pgcache_next(struct seq_file *f, void *v, loff_t *pos)
+{
+ struct ll_sb_info *sbi;
+ struct lu_env *env;
+ int refcheck;
+
+ env = cl_env_get(&refcheck);
+ if (!IS_ERR(env)) {
+ sbi = f->private;
+ *pos = vvp_pgcache_find(env, &sbi->ll_cl->cd_lu_dev, *pos + 1);
+ if (*pos == ~0ULL)
+ pos = NULL;
+ cl_env_put(env, &refcheck);
+ }
+ return pos;
+}
+
+static void vvp_pgcache_stop(struct seq_file *f, void *v)
+{
+ /* Nothing to do */
+}
+
+static struct seq_operations vvp_pgcache_ops = {
+ .start = vvp_pgcache_start,
+ .next = vvp_pgcache_next,
+ .stop = vvp_pgcache_stop,
+ .show = vvp_pgcache_show
+};
+
+static int vvp_dump_pgcache_seq_open(struct inode *inode, struct file *filp)
+{
+ struct ll_sb_info *sbi = PDE_DATA(inode);
+ struct seq_file *seq;
+ int result;
+
+ result = seq_open(filp, &vvp_pgcache_ops);
+ if (result == 0) {
+ seq = filp->private_data;
+ seq->private = sbi;
+ }
+ return result;
+}
+
+const struct file_operations vvp_dump_pgcache_file_ops = {
+ .owner = THIS_MODULE,
+ .open = vvp_dump_pgcache_seq_open,
+ .read = seq_read,
+ .llseek = seq_lseek,
+ .release = seq_release,
+};
Code Review / kvmfornfv.git / blobdiff