* - allocation and destruction of environment is amortized by caching no
* longer used environments instead of destroying them;
*
- * - there is a notion of "current" environment, attached to the kernel
- * data structure representing current thread Top-level lustre code
- * allocates an environment and makes it current, then calls into
- * non-lustre code, that in turn calls lustre back. Low-level lustre
- * code thus called can fetch environment created by the top-level code
- * and reuse it, avoiding additional environment allocation.
- * Right now, three interfaces can attach the cl_env to running thread:
- * - cl_env_get
- * - cl_env_implant
- * - cl_env_reexit(cl_env_reenter had to be called priorly)
- *
* \see lu_env, lu_context, lu_context_key
* @{
*/
-struct cl_env_nest {
- int cen_refcheck;
- void *cen_cookie;
-};
-
struct lu_env *cl_env_get(int *refcheck);
struct lu_env *cl_env_alloc(int *refcheck, __u32 tags);
-struct lu_env *cl_env_nested_get(struct cl_env_nest *nest);
void cl_env_put(struct lu_env *env, int *refcheck);
-void cl_env_nested_put(struct cl_env_nest *nest, struct lu_env *env);
-void *cl_env_reenter(void);
-void cl_env_reexit(void *cookie);
-void cl_env_implant(struct lu_env *env, int *refcheck);
-void cl_env_unplant(struct lu_env *env, int *refcheck);
unsigned int cl_env_cache_purge(unsigned int nr);
struct lu_env *cl_env_percpu_get(void);
void cl_env_percpu_put(struct lu_env *env);
int nr_ns;
struct ldlm_namespace *ns;
struct ldlm_namespace *ns_old = NULL; /* loop detection */
- void *cookie;
if (client == LDLM_NAMESPACE_CLIENT && !(gfp_mask & __GFP_FS))
return 0;
CDEBUG(D_DLMTRACE, "Request to count %s locks from all pools\n",
client == LDLM_NAMESPACE_CLIENT ? "client" : "server");
- cookie = cl_env_reenter();
-
/*
* Find out how many resources we may release.
*/
mutex_lock(ldlm_namespace_lock(client));
if (list_empty(ldlm_namespace_list(client))) {
mutex_unlock(ldlm_namespace_lock(client));
- cl_env_reexit(cookie);
return 0;
}
ns = ldlm_namespace_first_locked(client);
ldlm_namespace_put(ns);
}
- cl_env_reexit(cookie);
return total;
}
unsigned long freed = 0;
int tmp, nr_ns;
struct ldlm_namespace *ns;
- void *cookie;
if (client == LDLM_NAMESPACE_CLIENT && !(gfp_mask & __GFP_FS))
return -1;
- cookie = cl_env_reenter();
-
/*
* Shrink at least ldlm_namespace_nr_read(client) namespaces.
*/
freed += ldlm_pool_shrink(&ns->ns_pool, cancel, gfp_mask);
ldlm_namespace_put(ns);
}
- cl_env_reexit(cookie);
/*
* we only decrease the SLV in server pools shrinker, return
* SHRINK_STOP to kernel to avoid needless loop. LU-1128
*/
int ll_hsm_release(struct inode *inode)
{
- struct cl_env_nest nest;
struct lu_env *env;
struct obd_client_handle *och = NULL;
__u64 data_version = 0;
int rc;
+ int refcheck;
CDEBUG(D_INODE, "%s: Releasing file "DFID".\n",
ll_get_fsname(inode->i_sb, NULL, 0),
if (rc != 0)
goto out;
- env = cl_env_nested_get(&nest);
+ env = cl_env_get(&refcheck);
if (IS_ERR(env)) {
rc = PTR_ERR(env);
goto out;
}
ll_merge_attr(env, inode);
- cl_env_nested_put(&nest, env);
+ cl_env_put(env, &refcheck);
/* Release the file.
* NB: lease lock handle is released in mdc_hsm_release_pack() because
int cl_sync_file_range(struct inode *inode, loff_t start, loff_t end,
enum cl_fsync_mode mode, int ignore_layout)
{
- struct cl_env_nest nest;
struct lu_env *env;
struct cl_io *io;
struct cl_fsync_io *fio;
int result;
+ int refcheck;
if (mode != CL_FSYNC_NONE && mode != CL_FSYNC_LOCAL &&
mode != CL_FSYNC_DISCARD && mode != CL_FSYNC_ALL)
return -EINVAL;
- env = cl_env_nested_get(&nest);
+ env = cl_env_get(&refcheck);
if (IS_ERR(env))
return PTR_ERR(env);
if (result == 0)
result = fio->fi_nr_written;
cl_io_fini(env, io);
- cl_env_nested_put(&nest, env);
+ cl_env_put(env, &refcheck);
return result;
}
{
struct ll_inode_info *lli = ll_i2info(inode);
struct cl_object *obj = lli->lli_clob;
- struct cl_env_nest nest;
struct lu_env *env;
int rc;
+ int refcheck;
if (!obj)
return 0;
- env = cl_env_nested_get(&nest);
+ env = cl_env_get(&refcheck);
if (IS_ERR(env))
return PTR_ERR(env);
ll_layout_version_set(lli, cl.cl_layout_gen);
}
out:
- cl_env_nested_put(&nest, env);
+ cl_env_put(env, &refcheck);
return rc;
}
int emergency;
if (clob) {
- void *cookie;
-
- cookie = cl_env_reenter();
env = cl_env_get(&refcheck);
emergency = IS_ERR(env);
if (emergency) {
mutex_lock(&cl_inode_fini_guard);
LASSERT(cl_inode_fini_env);
- cl_env_implant(cl_inode_fini_env, &refcheck);
env = cl_inode_fini_env;
}
/*
lu_object_ref_del(&clob->co_lu, "inode", inode);
cl_object_put_last(env, clob);
lli->lli_clob = NULL;
- if (emergency) {
- cl_env_unplant(cl_inode_fini_env, &refcheck);
+ if (emergency)
mutex_unlock(&cl_inode_fini_guard);
- } else {
+ else
cl_env_put(env, &refcheck);
- }
- cl_env_reexit(cookie);
}
}
return rc;
}
- cg->lg_env = cl_env_get(&refcheck);
+ cg->lg_env = env;
cg->lg_io = io;
cg->lg_lock = lock;
cg->lg_gid = gid;
- LASSERT(cg->lg_env == env);
- cl_env_unplant(env, &refcheck);
return 0;
}
struct lu_env *env = cg->lg_env;
struct cl_io *io = cg->lg_io;
struct cl_lock *lock = cg->lg_lock;
- int refcheck;
LASSERT(cg->lg_env);
LASSERT(cg->lg_gid);
- cl_env_implant(env, &refcheck);
- cl_env_put(env, &refcheck);
-
cl_lock_release(env, lock);
cl_io_fini(env, io);
cl_env_put(env, NULL);
* API independent part for page fault initialization.
* \param vma - virtual memory area addressed to page fault
* \param env - corespondent lu_env to processing
- * \param nest - nested level
* \param index - page index corespondent to fault.
* \parm ra_flags - vma readahead flags.
*
- * \return allocated and initialized env for fault operation.
- * \retval EINVAL if env can't allocated
- * \return other error codes from cl_io_init.
+ * \return error codes from cl_io_init.
*/
static struct cl_io *
-ll_fault_io_init(struct vm_area_struct *vma, struct lu_env **env_ret,
- struct cl_env_nest *nest, pgoff_t index,
- unsigned long *ra_flags)
+ll_fault_io_init(struct lu_env *env, struct vm_area_struct *vma,
+ pgoff_t index, unsigned long *ra_flags)
{
struct file *file = vma->vm_file;
struct inode *inode = file_inode(file);
struct cl_io *io;
struct cl_fault_io *fio;
- struct lu_env *env;
int rc;
- *env_ret = NULL;
if (ll_file_nolock(file))
return ERR_PTR(-EOPNOTSUPP);
- /*
- * page fault can be called when lustre IO is
- * already active for the current thread, e.g., when doing read/write
- * against user level buffer mapped from Lustre buffer. To avoid
- * stomping on existing context, optionally force an allocation of a new
- * one.
- */
- env = cl_env_nested_get(nest);
- if (IS_ERR(env))
- return ERR_PTR(-EINVAL);
-
- *env_ret = env;
-
restart:
io = vvp_env_thread_io(env);
io->ci_obj = ll_i2info(inode)->lli_clob;
if (io->ci_need_restart)
goto restart;
- cl_env_nested_put(nest, env);
io = ERR_PTR(rc);
}
struct lu_env *env;
struct cl_io *io;
struct vvp_io *vio;
- struct cl_env_nest nest;
int result;
+ int refcheck;
sigset_t set;
struct inode *inode;
struct ll_inode_info *lli;
- io = ll_fault_io_init(vma, &env, &nest, vmpage->index, NULL);
+ env = cl_env_get(&refcheck);
+ if (IS_ERR(env))
+ return PTR_ERR(env);
+
+ io = ll_fault_io_init(env, vma, vmpage->index, NULL);
if (IS_ERR(io)) {
result = PTR_ERR(io);
goto out;
out_io:
cl_io_fini(env, io);
- cl_env_nested_put(&nest, env);
out:
+ cl_env_put(env, &refcheck);
CDEBUG(D_MMAP, "%s mkwrite with %d\n", current->comm, result);
LASSERT(ergo(result == 0, PageLocked(vmpage)));
struct vvp_io *vio = NULL;
struct page *vmpage;
unsigned long ra_flags;
- struct cl_env_nest nest;
- int result;
+ int result = 0;
int fault_ret = 0;
+ int refcheck;
- io = ll_fault_io_init(vma, &env, &nest, vmf->pgoff, &ra_flags);
- if (IS_ERR(io))
- return to_fault_error(PTR_ERR(io));
+ env = cl_env_get(&refcheck);
+ if (IS_ERR(env))
+ return PTR_ERR(env);
+
+ io = ll_fault_io_init(env, vma, vmf->pgoff, &ra_flags);
+ if (IS_ERR(io)) {
+ result = to_fault_error(PTR_ERR(io));
+ goto out;
+ }
result = io->ci_result;
if (result == 0) {
}
}
cl_io_fini(env, io);
- cl_env_nested_put(&nest, env);
vma->vm_flags |= ra_flags;
+
+out:
+ cl_env_put(env, &refcheck);
if (result != 0 && !(fault_ret & VM_FAULT_RETRY))
fault_ret |= to_fault_error(result);
- CDEBUG(D_MMAP, "%s fault %d/%d\n",
- current->comm, fault_ret, result);
+ CDEBUG(D_MMAP, "%s fault %d/%d\n", current->comm, fault_ret, result);
return fault_ret;
}
struct cl_io *io;
struct cl_page *page;
struct cl_object *clob;
- struct cl_env_nest nest;
bool redirtied = false;
bool unlocked = false;
int result;
+ int refcheck;
LASSERT(PageLocked(vmpage));
LASSERT(!PageWriteback(vmpage));
LASSERT(ll_i2dtexp(inode));
- env = cl_env_nested_get(&nest);
+ env = cl_env_get(&refcheck);
if (IS_ERR(env)) {
result = PTR_ERR(env);
goto out;
}
}
- cl_env_nested_put(&nest, env);
+ cl_env_put(env, &refcheck);
goto out;
out:
static int ll_releasepage(struct page *vmpage, gfp_t gfp_mask)
{
struct lu_env *env;
- void *cookie;
struct cl_object *obj;
struct cl_page *page;
struct address_space *mapping;
if (!page)
return 1;
- cookie = cl_env_reenter();
env = cl_env_percpu_get();
LASSERT(!IS_ERR(env));
cl_page_put(env, page);
cl_env_percpu_put(env);
- cl_env_reexit(cookie);
return result;
}
PAGE_SIZE) & ~(DT_MAX_BRW_SIZE - 1))
static ssize_t ll_direct_IO_26(struct kiocb *iocb, struct iov_iter *iter)
{
- struct lu_env *env;
+ struct ll_cl_context *lcc;
+ const struct lu_env *env;
struct cl_io *io;
struct file *file = iocb->ki_filp;
struct inode *inode = file->f_mapping->host;
ssize_t count = iov_iter_count(iter);
ssize_t tot_bytes = 0, result = 0;
long size = MAX_DIO_SIZE;
- int refcheck;
/* FIXME: io smaller than PAGE_SIZE is broken on ia64 ??? */
if ((file_offset & ~PAGE_MASK) || (count & ~PAGE_MASK))
if (iov_iter_alignment(iter) & ~PAGE_MASK)
return -EINVAL;
- env = cl_env_get(&refcheck);
+ lcc = ll_cl_find(file);
+ if (!lcc)
+ return -EIO;
+
+ env = lcc->lcc_env;
LASSERT(!IS_ERR(env));
- io = vvp_env_io(env)->vui_cl.cis_io;
+ io = lcc->lcc_io;
LASSERT(io);
while (iov_iter_count(iter)) {
vio->u.write.vui_written += tot_bytes;
}
- cl_env_put(env, &refcheck);
return tot_bytes ? tot_bytes : result;
}
sub->sub_env = ld->ld_emrg[stripe]->emrg_env;
sub->sub_borrowed = 1;
} else {
- void *cookie;
-
- /* obtain new environment */
- cookie = cl_env_reenter();
sub->sub_env = cl_env_get(&sub->sub_refcheck);
- cl_env_reexit(cookie);
if (IS_ERR(sub->sub_env))
result = PTR_ERR(sub->sub_env);
union lov_layout_state *state = &lov->u;
const struct lov_layout_operations *old_ops;
const struct lov_layout_operations *new_ops;
- void *cookie;
struct lu_env *env;
int refcheck;
int rc;
LASSERT(0 <= lov->lo_type && lov->lo_type < ARRAY_SIZE(lov_dispatch));
- cookie = cl_env_reenter();
env = cl_env_get(&refcheck);
- if (IS_ERR(env)) {
- cl_env_reexit(cookie);
+ if (IS_ERR(env))
return PTR_ERR(env);
- }
LASSERT(0 <= llt && llt < ARRAY_SIZE(lov_dispatch));
lov->lo_type = llt;
out:
cl_env_put(env, &refcheck);
- cl_env_reexit(cookie);
return rc;
}
};
/**
- * Counters used to check correctness of cl_lock interface usage.
- */
-struct cl_thread_counters {
- /**
- * Number of outstanding calls to cl_lock_mutex_get() made by the
- * current thread. For debugging.
- */
- int ctc_nr_locks_locked;
- /** List of locked locks. */
- struct lu_ref ctc_locks_locked;
- /** Number of outstanding holds on locks. */
- int ctc_nr_held;
- /** Number of outstanding uses on locks. */
- int ctc_nr_used;
- /** Number of held extent locks. */
- int ctc_nr_locks_acquired;
-};
-
-/**
* Thread local state internal for generic cl-code.
*/
struct cl_thread_info {
*/
struct cl_lock_descr clt_descr;
struct cl_page_list clt_list;
- /**
- * Counters for every level of lock nesting.
- */
- struct cl_thread_counters clt_counters[CNL_NR];
/** @} debugging */
/*
scan->cis_iop->op[io->ci_type].cio_unlock(env, scan);
}
io->ci_state = CIS_UNLOCKED;
- LASSERT(!cl_env_info(env)->clt_counters[CNL_TOP].ctc_nr_locks_acquired);
}
EXPORT_SYMBOL(cl_io_unlock);
* bz20044, bz22683.
*/
-static LIST_HEAD(cl_envs);
-static unsigned int cl_envs_cached_nr;
-static unsigned int cl_envs_cached_max = 128; /* XXX: prototype: arbitrary limit
- * for now.
- */
-static DEFINE_SPINLOCK(cl_envs_guard);
+static unsigned int cl_envs_cached_max = 32; /* XXX: prototype: arbitrary limit
+ * for now.
+ */
+static struct cl_env_cache {
+ rwlock_t cec_guard;
+ unsigned int cec_count;
+ struct list_head cec_envs;
+} *cl_envs = NULL;
struct cl_env {
void *ce_magic;
struct lu_env ce_lu;
struct lu_context ce_ses;
- /**
- * This allows cl_env to be entered into cl_env_hash which implements
- * the current thread -> client environment lookup.
- */
- struct hlist_node ce_node;
- /**
- * Owner for the current cl_env.
- *
- * If LL_TASK_CL_ENV is defined, this point to the owning current,
- * only for debugging purpose ;
- * Otherwise hash is used, and this is the key for cfs_hash.
- * Now current thread pid is stored. Note using thread pointer would
- * lead to unbalanced hash because of its specific allocation locality
- * and could be varied for different platforms and OSes, even different
- * OS versions.
- */
- void *ce_owner;
-
/*
* Linkage into global list of all client environments. Used for
* garbage collection.
{
LASSERT(cle->ce_ref == 0);
LASSERT(cle->ce_magic == &cl_env_init0);
- LASSERT(!cle->ce_debug && !cle->ce_owner);
+ LASSERT(!cle->ce_debug);
cle->ce_ref = 1;
cle->ce_debug = debug;
CL_ENV_INC(busy);
}
-/*
- * The implementation of using hash table to connect cl_env and thread
- */
-
-static struct cfs_hash *cl_env_hash;
-
-static unsigned cl_env_hops_hash(struct cfs_hash *lh,
- const void *key, unsigned mask)
-{
-#if BITS_PER_LONG == 64
- return cfs_hash_u64_hash((__u64)key, mask);
-#else
- return cfs_hash_u32_hash((__u32)key, mask);
-#endif
-}
-
-static void *cl_env_hops_obj(struct hlist_node *hn)
-{
- struct cl_env *cle = hlist_entry(hn, struct cl_env, ce_node);
-
- LASSERT(cle->ce_magic == &cl_env_init0);
- return (void *)cle;
-}
-
-static int cl_env_hops_keycmp(const void *key, struct hlist_node *hn)
-{
- struct cl_env *cle = cl_env_hops_obj(hn);
-
- LASSERT(cle->ce_owner);
- return (key == cle->ce_owner);
-}
-
-static void cl_env_hops_noop(struct cfs_hash *hs, struct hlist_node *hn)
-{
- struct cl_env *cle = hlist_entry(hn, struct cl_env, ce_node);
-
- LASSERT(cle->ce_magic == &cl_env_init0);
-}
-
-static struct cfs_hash_ops cl_env_hops = {
- .hs_hash = cl_env_hops_hash,
- .hs_key = cl_env_hops_obj,
- .hs_keycmp = cl_env_hops_keycmp,
- .hs_object = cl_env_hops_obj,
- .hs_get = cl_env_hops_noop,
- .hs_put_locked = cl_env_hops_noop,
-};
-
-static inline struct cl_env *cl_env_fetch(void)
-{
- struct cl_env *cle;
-
- cle = cfs_hash_lookup(cl_env_hash, (void *)(long)current->pid);
- LASSERT(ergo(cle, cle->ce_magic == &cl_env_init0));
- return cle;
-}
-
-static inline void cl_env_attach(struct cl_env *cle)
-{
- if (cle) {
- int rc;
-
- LASSERT(!cle->ce_owner);
- cle->ce_owner = (void *)(long)current->pid;
- rc = cfs_hash_add_unique(cl_env_hash, cle->ce_owner,
- &cle->ce_node);
- LASSERT(rc == 0);
- }
-}
-
-static inline void cl_env_do_detach(struct cl_env *cle)
-{
- void *cookie;
-
- LASSERT(cle->ce_owner == (void *)(long)current->pid);
- cookie = cfs_hash_del(cl_env_hash, cle->ce_owner,
- &cle->ce_node);
- LASSERT(cookie == cle);
- cle->ce_owner = NULL;
-}
-
-static int cl_env_store_init(void)
-{
- cl_env_hash = cfs_hash_create("cl_env",
- HASH_CL_ENV_BITS, HASH_CL_ENV_BITS,
- HASH_CL_ENV_BKT_BITS, 0,
- CFS_HASH_MIN_THETA,
- CFS_HASH_MAX_THETA,
- &cl_env_hops,
- CFS_HASH_RW_BKTLOCK);
- return cl_env_hash ? 0 : -ENOMEM;
-}
-
-static void cl_env_store_fini(void)
-{
- cfs_hash_putref(cl_env_hash);
-}
-
-static inline struct cl_env *cl_env_detach(struct cl_env *cle)
-{
- if (!cle)
- cle = cl_env_fetch();
-
- if (cle && cle->ce_owner)
- cl_env_do_detach(cle);
-
- return cle;
-}
-
static struct lu_env *cl_env_new(__u32 ctx_tags, __u32 ses_tags, void *debug)
{
struct lu_env *env;
{
struct cl_env *cle;
struct lu_env *env;
+ int cpu = get_cpu();
- spin_lock(&cl_envs_guard);
- LASSERT(equi(cl_envs_cached_nr == 0, list_empty(&cl_envs)));
- if (cl_envs_cached_nr > 0) {
+ read_lock(&cl_envs[cpu].cec_guard);
+ LASSERT(equi(cl_envs[cpu].cec_count == 0,
+ list_empty(&cl_envs[cpu].cec_envs)));
+ if (cl_envs[cpu].cec_count > 0) {
int rc;
- cle = container_of(cl_envs.next, struct cl_env, ce_linkage);
+ cle = container_of(cl_envs[cpu].cec_envs.next, struct cl_env,
+ ce_linkage);
list_del_init(&cle->ce_linkage);
- cl_envs_cached_nr--;
- spin_unlock(&cl_envs_guard);
+ cl_envs[cpu].cec_count--;
+ read_unlock(&cl_envs[cpu].cec_guard);
+ put_cpu();
env = &cle->ce_lu;
rc = lu_env_refill(env);
env = ERR_PTR(rc);
}
} else {
- spin_unlock(&cl_envs_guard);
+ read_unlock(&cl_envs[cpu].cec_guard);
+ put_cpu();
env = cl_env_new(lu_context_tags_default,
lu_session_tags_default, debug);
}
return container_of(env, struct cl_env, ce_lu);
}
-static struct lu_env *cl_env_peek(int *refcheck)
-{
- struct lu_env *env;
- struct cl_env *cle;
-
- CL_ENV_INC(lookup);
-
- /* check that we don't go far from untrusted pointer */
- CLASSERT(offsetof(struct cl_env, ce_magic) == 0);
-
- env = NULL;
- cle = cl_env_fetch();
- if (cle) {
- CL_ENV_INC(hit);
- env = &cle->ce_lu;
- *refcheck = ++cle->ce_ref;
- }
- CDEBUG(D_OTHER, "%d@%p\n", cle ? cle->ce_ref : 0, cle);
- return env;
-}
-
/**
* Returns lu_env: if there already is an environment associated with the
* current thread, it is returned, otherwise, new environment is allocated.
{
struct lu_env *env;
- env = cl_env_peek(refcheck);
- if (!env) {
- env = cl_env_obtain(__builtin_return_address(0));
- if (!IS_ERR(env)) {
- struct cl_env *cle;
+ env = cl_env_obtain(__builtin_return_address(0));
+ if (!IS_ERR(env)) {
+ struct cl_env *cle;
- cle = cl_env_container(env);
- cl_env_attach(cle);
- *refcheck = cle->ce_ref;
- CDEBUG(D_OTHER, "%d@%p\n", cle->ce_ref, cle);
- }
+ cle = cl_env_container(env);
+ *refcheck = cle->ce_ref;
+ CDEBUG(D_OTHER, "%d@%p\n", cle->ce_ref, cle);
}
return env;
}
{
struct lu_env *env;
- LASSERT(!cl_env_peek(refcheck));
env = cl_env_new(tags, tags, __builtin_return_address(0));
if (!IS_ERR(env)) {
struct cl_env *cle;
static void cl_env_exit(struct cl_env *cle)
{
- LASSERT(!cle->ce_owner);
lu_context_exit(&cle->ce_lu.le_ctx);
lu_context_exit(&cle->ce_ses);
}
unsigned int cl_env_cache_purge(unsigned int nr)
{
struct cl_env *cle;
+ unsigned int i;
- spin_lock(&cl_envs_guard);
- for (; !list_empty(&cl_envs) && nr > 0; --nr) {
- cle = container_of(cl_envs.next, struct cl_env, ce_linkage);
- list_del_init(&cle->ce_linkage);
- LASSERT(cl_envs_cached_nr > 0);
- cl_envs_cached_nr--;
- spin_unlock(&cl_envs_guard);
+ for_each_possible_cpu(i) {
+ write_lock(&cl_envs[i].cec_guard);
+ for (; !list_empty(&cl_envs[i].cec_envs) && nr > 0; --nr) {
+ cle = container_of(cl_envs[i].cec_envs.next,
+ struct cl_env, ce_linkage);
+ list_del_init(&cle->ce_linkage);
+ LASSERT(cl_envs[i].cec_count > 0);
+ cl_envs[i].cec_count--;
+ write_unlock(&cl_envs[i].cec_guard);
- cl_env_fini(cle);
- spin_lock(&cl_envs_guard);
+ cl_env_fini(cle);
+ write_lock(&cl_envs[i].cec_guard);
+ }
+ LASSERT(equi(cl_envs[i].cec_count == 0,
+ list_empty(&cl_envs[i].cec_envs)));
+ write_unlock(&cl_envs[i].cec_guard);
}
- LASSERT(equi(cl_envs_cached_nr == 0, list_empty(&cl_envs)));
- spin_unlock(&cl_envs_guard);
return nr;
}
EXPORT_SYMBOL(cl_env_cache_purge);
CDEBUG(D_OTHER, "%d@%p\n", cle->ce_ref, cle);
if (--cle->ce_ref == 0) {
+ int cpu = get_cpu();
+
CL_ENV_DEC(busy);
- cl_env_detach(cle);
cle->ce_debug = NULL;
cl_env_exit(cle);
/*
* Return environment to the cache only when it was allocated
* with the standard tags.
*/
- if (cl_envs_cached_nr < cl_envs_cached_max &&
+ if (cl_envs[cpu].cec_count < cl_envs_cached_max &&
(env->le_ctx.lc_tags & ~LCT_HAS_EXIT) == LCT_CL_THREAD &&
(env->le_ses->lc_tags & ~LCT_HAS_EXIT) == LCT_SESSION) {
- spin_lock(&cl_envs_guard);
- list_add(&cle->ce_linkage, &cl_envs);
- cl_envs_cached_nr++;
- spin_unlock(&cl_envs_guard);
+ read_lock(&cl_envs[cpu].cec_guard);
+ list_add(&cle->ce_linkage, &cl_envs[cpu].cec_envs);
+ cl_envs[cpu].cec_count++;
+ read_unlock(&cl_envs[cpu].cec_guard);
} else {
cl_env_fini(cle);
}
+ put_cpu();
}
}
EXPORT_SYMBOL(cl_env_put);
/**
- * Declares a point of re-entrancy.
- *
- * \see cl_env_reexit()
- */
-void *cl_env_reenter(void)
-{
- return cl_env_detach(NULL);
-}
-EXPORT_SYMBOL(cl_env_reenter);
-
-/**
- * Exits re-entrancy.
- */
-void cl_env_reexit(void *cookie)
-{
- cl_env_detach(NULL);
- cl_env_attach(cookie);
-}
-EXPORT_SYMBOL(cl_env_reexit);
-
-/**
- * Setup user-supplied \a env as a current environment. This is to be used to
- * guaranteed that environment exists even when cl_env_get() fails. It is up
- * to user to ensure proper concurrency control.
- *
- * \see cl_env_unplant()
- */
-void cl_env_implant(struct lu_env *env, int *refcheck)
-{
- struct cl_env *cle = cl_env_container(env);
-
- LASSERT(cle->ce_ref > 0);
-
- cl_env_attach(cle);
- cl_env_get(refcheck);
- CDEBUG(D_OTHER, "%d@%p\n", cle->ce_ref, cle);
-}
-EXPORT_SYMBOL(cl_env_implant);
-
-/**
- * Detach environment installed earlier by cl_env_implant().
- */
-void cl_env_unplant(struct lu_env *env, int *refcheck)
-{
- struct cl_env *cle = cl_env_container(env);
-
- LASSERT(cle->ce_ref > 1);
-
- CDEBUG(D_OTHER, "%d@%p\n", cle->ce_ref, cle);
-
- cl_env_detach(cle);
- cl_env_put(env, refcheck);
-}
-EXPORT_SYMBOL(cl_env_unplant);
-
-struct lu_env *cl_env_nested_get(struct cl_env_nest *nest)
-{
- struct lu_env *env;
-
- nest->cen_cookie = NULL;
- env = cl_env_peek(&nest->cen_refcheck);
- if (env) {
- if (!cl_io_is_going(env))
- return env;
- cl_env_put(env, &nest->cen_refcheck);
- nest->cen_cookie = cl_env_reenter();
- }
- env = cl_env_get(&nest->cen_refcheck);
- if (IS_ERR(env)) {
- cl_env_reexit(nest->cen_cookie);
- return env;
- }
-
- LASSERT(!cl_io_is_going(env));
- return env;
-}
-EXPORT_SYMBOL(cl_env_nested_get);
-
-void cl_env_nested_put(struct cl_env_nest *nest, struct lu_env *env)
-{
- cl_env_put(env, &nest->cen_refcheck);
- cl_env_reexit(nest->cen_cookie);
-}
-EXPORT_SYMBOL(cl_env_nested_put);
-
-/**
* Converts struct ost_lvb to struct cl_attr.
*
* \see cl_attr2lvb
for_each_possible_cpu(i) {
struct lu_env *env;
+ rwlock_init(&cl_envs[i].cec_guard);
+ INIT_LIST_HEAD(&cl_envs[i].cec_envs);
+ cl_envs[i].cec_count = 0;
+
cle = &cl_env_percpu[i];
env = &cle->ce_lu;
LASSERT(cle->ce_ref == 0);
CL_ENV_DEC(busy);
- cl_env_detach(cle);
cle->ce_debug = NULL;
put_cpu();
cle = &cl_env_percpu[get_cpu()];
cl_env_init0(cle, __builtin_return_address(0));
- cl_env_attach(cle);
return &cle->ce_lu;
}
EXPORT_SYMBOL(cl_env_percpu_get);
static void *cl_key_init(const struct lu_context *ctx,
struct lu_context_key *key)
{
- struct cl_thread_info *info;
-
- info = cl0_key_init(ctx, key);
- if (!IS_ERR(info)) {
- size_t i;
-
- for (i = 0; i < ARRAY_SIZE(info->clt_counters); ++i)
- lu_ref_init(&info->clt_counters[i].ctc_locks_locked);
- }
- return info;
+ return cl0_key_init(ctx, key);
}
static void cl_key_fini(const struct lu_context *ctx,
struct lu_context_key *key, void *data)
{
- struct cl_thread_info *info;
- size_t i;
-
- info = data;
- for (i = 0; i < ARRAY_SIZE(info->clt_counters); ++i)
- lu_ref_fini(&info->clt_counters[i].ctc_locks_locked);
cl0_key_fini(ctx, key, data);
}
-static void cl_key_exit(const struct lu_context *ctx,
- struct lu_context_key *key, void *data)
-{
- struct cl_thread_info *info = data;
- size_t i;
-
- for (i = 0; i < ARRAY_SIZE(info->clt_counters); ++i) {
- LASSERT(info->clt_counters[i].ctc_nr_held == 0);
- LASSERT(info->clt_counters[i].ctc_nr_used == 0);
- LASSERT(info->clt_counters[i].ctc_nr_locks_acquired == 0);
- LASSERT(info->clt_counters[i].ctc_nr_locks_locked == 0);
- lu_ref_fini(&info->clt_counters[i].ctc_locks_locked);
- lu_ref_init(&info->clt_counters[i].ctc_locks_locked);
- }
-}
-
static struct lu_context_key cl_key = {
.lct_tags = LCT_CL_THREAD,
.lct_init = cl_key_init,
.lct_fini = cl_key_fini,
- .lct_exit = cl_key_exit
};
static struct lu_kmem_descr cl_object_caches[] = {
{
int result;
- result = cl_env_store_init();
- if (result)
- return result;
+ cl_envs = kzalloc(sizeof(*cl_envs) * num_possible_cpus(), GFP_KERNEL);
+ if (!cl_envs) {
+ result = -ENOMEM;
+ goto out;
+ }
result = lu_kmem_init(cl_object_caches);
if (result)
- goto out_store;
+ goto out_envs;
LU_CONTEXT_KEY_INIT(&cl_key);
result = lu_context_key_register(&cl_key);
result = cl_env_percpu_init();
if (result)
/* no cl_env_percpu_fini on error */
- goto out_context;
+ goto out_keys;
return 0;
-out_context:
+out_keys:
lu_context_key_degister(&cl_key);
out_kmem:
lu_kmem_fini(cl_object_caches);
-out_store:
- cl_env_store_fini();
+out_envs:
+ kfree(cl_envs);
+out:
return result;
}
cl_env_percpu_fini();
lu_context_key_degister(&cl_key);
lu_kmem_fini(cl_object_caches);
- cl_env_store_fini();
+ kfree(cl_envs);
}
if (!(key->lct_tags & LCT_QUIESCENT)) {
/*
- * XXX layering violation.
- */
- cl_env_cache_purge(~0);
- /*
* XXX memory barrier has to go here.
*/
spin_lock(&lu_keys_guard);
kmem_cache_free(echo_thread_kmem, info);
}
-static void echo_thread_key_exit(const struct lu_context *ctx,
- struct lu_context_key *key, void *data)
-{
-}
-
static struct lu_context_key echo_thread_key = {
.lct_tags = LCT_CL_THREAD,
.lct_init = echo_thread_key_init,
.lct_fini = echo_thread_key_fini,
- .lct_exit = echo_thread_key_exit
};
static void *echo_session_key_init(const struct lu_context *ctx,
kmem_cache_free(echo_session_kmem, session);
}
-static void echo_session_key_exit(const struct lu_context *ctx,
- struct lu_context_key *key, void *data)
-{
-}
-
static struct lu_context_key echo_session_key = {
.lct_tags = LCT_SESSION,
.lct_init = echo_session_key_init,
.lct_fini = echo_session_key_fini,
- .lct_exit = echo_session_key_exit
};
LU_TYPE_INIT_FINI(echo, &echo_thread_key, &echo_session_key);
cl_device_fini(&ed->ed_cl);
kfree(ed);
+ cl_env_cache_purge(~0);
+
return NULL;
}
static int osc_extent_truncate(struct osc_extent *ext, pgoff_t trunc_index,
bool partial)
{
- struct cl_env_nest nest;
struct lu_env *env;
struct cl_io *io;
struct osc_object *obj = ext->oe_obj;
int grants = 0;
int nr_pages = 0;
int rc = 0;
+ int refcheck;
LASSERT(sanity_check(ext) == 0);
EASSERT(ext->oe_state == OES_TRUNC, ext);
* We can't use that env from osc_cache_truncate_start() because
* it's from lov_io_sub and not fully initialized.
*/
- env = cl_env_nested_get(&nest);
+ env = cl_env_get(&refcheck);
io = &osc_env_info(env)->oti_io;
io->ci_obj = cl_object_top(osc2cl(obj));
rc = cl_io_init(env, io, CIT_MISC, io->ci_obj);
out:
cl_io_fini(env, io);
- cl_env_nested_put(&nest, env);
+ cl_env_put(env, &refcheck);
return rc;
}
struct osc_lock *oscl = cookie;
struct cl_lock_slice *slice = &oscl->ols_cl;
struct lu_env *env;
- struct cl_env_nest nest;
int rc;
+ int refcheck;
- env = cl_env_nested_get(&nest);
+ env = cl_env_get(&refcheck);
/* should never happen, similar to osc_ldlm_blocking_ast(). */
LASSERT(!IS_ERR(env));
if (oscl->ols_owner)
cl_sync_io_note(env, oscl->ols_owner, rc);
- cl_env_nested_put(&nest, env);
+ cl_env_put(env, &refcheck);
return rc;
}
struct osc_object *osc = cookie;
struct ldlm_lock *dlmlock;
struct lu_env *env;
- struct cl_env_nest nest;
+ int refcheck;
- env = cl_env_nested_get(&nest);
+ env = cl_env_get(&refcheck);
LASSERT(!IS_ERR(env));
if (errcode == ELDLM_LOCK_MATCHED) {
out:
cl_object_put(env, osc2cl(osc));
- cl_env_nested_put(&nest, env);
+ cl_env_put(env, &refcheck);
return ldlm_error2errno(errcode);
}
enum cl_lock_mode mode, int discard)
{
struct lu_env *env;
- struct cl_env_nest nest;
+ int refcheck;
int rc = 0;
int rc2 = 0;
- env = cl_env_nested_get(&nest);
+ env = cl_env_get(&refcheck);
if (IS_ERR(env))
return PTR_ERR(env);
if (rc == 0 && rc2 < 0)
rc = rc2;
- cl_env_nested_put(&nest, env);
+ cl_env_put(env, &refcheck);
return rc;
}
}
case LDLM_CB_CANCELING: {
struct lu_env *env;
- struct cl_env_nest nest;
+ int refcheck;
/*
* This can be called in the context of outer IO, e.g.,
* new environment has to be created to not corrupt outer
* context.
*/
- env = cl_env_nested_get(&nest);
+ env = cl_env_get(&refcheck);
if (IS_ERR(env)) {
result = PTR_ERR(env);
break;
}
result = osc_dlm_blocking_ast0(env, dlmlock, data, flag);
- cl_env_nested_put(&nest, env);
+ cl_env_put(env, &refcheck);
break;
}
default:
static int osc_ldlm_glimpse_ast(struct ldlm_lock *dlmlock, void *data)
{
struct ptlrpc_request *req = data;
- struct cl_env_nest nest;
struct lu_env *env;
struct ost_lvb *lvb;
struct req_capsule *cap;
+ struct cl_object *obj = NULL;
int result;
+ int refcheck;
LASSERT(lustre_msg_get_opc(req->rq_reqmsg) == LDLM_GL_CALLBACK);
- env = cl_env_nested_get(&nest);
- if (!IS_ERR(env)) {
- struct cl_object *obj = NULL;
+ env = cl_env_get(&refcheck);
+ if (IS_ERR(env)) {
+ result = PTR_ERR(env);
+ goto out;
+ }
- lock_res_and_lock(dlmlock);
- if (dlmlock->l_ast_data) {
- obj = osc2cl(dlmlock->l_ast_data);
- cl_object_get(obj);
- }
- unlock_res_and_lock(dlmlock);
+ lock_res_and_lock(dlmlock);
+ if (dlmlock->l_ast_data) {
+ obj = osc2cl(dlmlock->l_ast_data);
+ cl_object_get(obj);
+ }
+ unlock_res_and_lock(dlmlock);
- if (obj) {
- /* Do not grab the mutex of cl_lock for glimpse.
- * See LU-1274 for details.
- * BTW, it's okay for cl_lock to be cancelled during
- * this period because server can handle this race.
- * See ldlm_server_glimpse_ast() for details.
- * cl_lock_mutex_get(env, lock);
- */
- cap = &req->rq_pill;
- req_capsule_extend(cap, &RQF_LDLM_GL_CALLBACK);
- req_capsule_set_size(cap, &RMF_DLM_LVB, RCL_SERVER,
- sizeof(*lvb));
- result = req_capsule_server_pack(cap);
- if (result == 0) {
- lvb = req_capsule_server_get(cap, &RMF_DLM_LVB);
- result = cl_object_glimpse(env, obj, lvb);
- }
- if (!exp_connect_lvb_type(req->rq_export))
- req_capsule_shrink(&req->rq_pill,
- &RMF_DLM_LVB,
- sizeof(struct ost_lvb_v1),
- RCL_SERVER);
- cl_object_put(env, obj);
- } else {
- /*
- * These errors are normal races, so we don't want to
- * fill the console with messages by calling
- * ptlrpc_error()
- */
- lustre_pack_reply(req, 1, NULL, NULL);
- result = -ELDLM_NO_LOCK_DATA;
+ if (obj) {
+ /* Do not grab the mutex of cl_lock for glimpse.
+ * See LU-1274 for details.
+ * BTW, it's okay for cl_lock to be cancelled during
+ * this period because server can handle this race.
+ * See ldlm_server_glimpse_ast() for details.
+ * cl_lock_mutex_get(env, lock);
+ */
+ cap = &req->rq_pill;
+ req_capsule_extend(cap, &RQF_LDLM_GL_CALLBACK);
+ req_capsule_set_size(cap, &RMF_DLM_LVB, RCL_SERVER,
+ sizeof(*lvb));
+ result = req_capsule_server_pack(cap);
+ if (result == 0) {
+ lvb = req_capsule_server_get(cap, &RMF_DLM_LVB);
+ result = cl_object_glimpse(env, obj, lvb);
}
- cl_env_nested_put(&nest, env);
+ if (!exp_connect_lvb_type(req->rq_export))
+ req_capsule_shrink(&req->rq_pill, &RMF_DLM_LVB,
+ sizeof(struct ost_lvb_v1), RCL_SERVER);
+ cl_object_put(env, obj);
} else {
- result = PTR_ERR(env);
+ /*
+ * These errors are normal races, so we don't want to
+ * fill the console with messages by calling
+ * ptlrpc_error()
+ */
+ lustre_pack_reply(req, 1, NULL, NULL);
+ result = -ELDLM_NO_LOCK_DATA;
}
+ cl_env_put(env, &refcheck);
+
+out:
req->rq_status = result;
return result;
}
*/
unsigned long osc_ldlm_weigh_ast(struct ldlm_lock *dlmlock)
{
- struct cl_env_nest nest;
struct lu_env *env;
struct osc_object *obj;
struct osc_lock *oscl;
unsigned long weight;
bool found = false;
+ int refcheck;
might_sleep();
/*
* the upper context because cl_lock_put don't modify environment
* variables. But just in case ..
*/
- env = cl_env_nested_get(&nest);
+ env = cl_env_get(&refcheck);
if (IS_ERR(env))
/* Mostly because lack of memory, do not eliminate this lock */
return 1;
weight = osc_lock_weight(env, obj, &dlmlock->l_policy_data.l_extent);
out:
- cl_env_nested_put(&nest, env);
+ cl_env_put(env, &refcheck);
return weight;
}
long osc_lru_reclaim(struct client_obd *cli)
{
- struct cl_env_nest nest;
struct lu_env *env;
struct cl_client_cache *cache = cli->cl_cache;
int max_scans;
+ int refcheck;
long rc = 0;
LASSERT(cache);
- env = cl_env_nested_get(&nest);
+ env = cl_env_get(&refcheck);
if (IS_ERR(env))
return 0;
spin_unlock(&cache->ccc_lru_lock);
out:
- cl_env_nested_put(&nest, env);
+ cl_env_put(env, &refcheck);
CDEBUG(D_CACHE, "%s: cli %p freed %ld pages.\n",
cli->cl_import->imp_obd->obd_name, cli, rc);
return rc;
projects / platform / kernel / linux-rpi.git / commitdiff