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29 * This file is part of Lustre, http://www.lustre.org/
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32 * Implementation of cl_lock for LOV layer.
34 * Author: Nikita Danilov <nikita.danilov@sun.com>
37 #define DEBUG_SUBSYSTEM S_LOV
39 #include "lov_cl_internal.h"
45 /*****************************************************************************
47 * Lov lock operations.
51 static struct lov_sublock_env *lov_sublock_env_get(const struct lu_env *env,
52 const struct cl_lock *parent,
53 struct lov_lock_sub *lls)
55 struct lov_sublock_env *subenv;
56 struct lov_io *lio = lov_env_io(env);
57 struct cl_io *io = lio->lis_cl.cis_io;
58 struct lov_io_sub *sub;
60 subenv = &lov_env_session(env)->ls_subenv;
63 * FIXME: We tend to use the subio's env & io to call the sublock
64 * lock operations because osc lock sometimes stores some control
65 * variables in thread's IO infomation(Now only lockless information).
66 * However, if the lock's host(object) is different from the object
67 * for current IO, we have no way to get the subenv and subio because
68 * they are not initialized at all. As a temp fix, in this case,
69 * we still borrow the parent's env to call sublock operations.
71 if (!io || !cl_object_same(io->ci_obj, parent->cll_descr.cld_obj)) {
72 subenv->lse_env = env;
75 sub = lov_sub_get(env, lio, lls->sub_stripe);
77 subenv->lse_env = sub->sub_env;
78 subenv->lse_io = sub->sub_io;
86 static int lov_sublock_init(const struct lu_env *env,
87 const struct cl_lock *parent,
88 struct lov_lock_sub *lls)
90 struct lov_sublock_env *subenv;
94 subenv = lov_sublock_env_get(env, parent, lls);
95 if (!IS_ERR(subenv)) {
96 result = cl_lock_init(subenv->lse_env, &lls->sub_lock,
100 result = PTR_ERR(subenv);
106 * Creates sub-locks for a given lov_lock for the first time.
108 * Goes through all sub-objects of top-object, and creates sub-locks on every
109 * sub-object intersecting with top-lock extent. This is complicated by the
110 * fact that top-lock (that is being created) can be accessed concurrently
111 * through already created sub-locks (possibly shared with other top-locks).
113 static struct lov_lock *lov_lock_sub_init(const struct lu_env *env,
114 const struct cl_object *obj,
115 struct cl_lock *lock)
125 struct lov_object *loo = cl2lov(obj);
126 struct lov_layout_raid0 *r0 = lov_r0(loo);
127 struct lov_lock *lovlck;
131 CDEBUG(D_INODE, "%p: lock/io FID "DFID"/"DFID", lock/io clobj %p/%p\n",
132 loo, PFID(lu_object_fid(lov2lu(loo))),
133 PFID(lu_object_fid(&obj->co_lu)),
136 file_start = cl_offset(lov2cl(loo), lock->cll_descr.cld_start);
137 file_end = cl_offset(lov2cl(loo), lock->cll_descr.cld_end + 1) - 1;
139 for (i = 0, nr = 0; i < r0->lo_nr; i++) {
141 * XXX for wide striping smarter algorithm is desirable,
142 * breaking out of the loop, early.
144 if (likely(r0->lo_sub[i] != NULL) && /* spare layout */
145 lov_stripe_intersects(loo->lo_lsm, i,
146 file_start, file_end, &start, &end))
151 OBD_ALLOC_LARGE(lovlck, offsetof(struct lov_lock, lls_sub[nr]));
153 RETURN(ERR_PTR(-ENOMEM));
156 for (i = 0, nr = 0; i < r0->lo_nr; ++i) {
157 if (likely(r0->lo_sub[i] != NULL) &&
158 lov_stripe_intersects(loo->lo_lsm, i,
159 file_start, file_end, &start, &end)) {
160 struct lov_lock_sub *lls = &lovlck->lls_sub[nr];
161 struct cl_lock_descr *descr;
163 descr = &lls->sub_lock.cll_descr;
165 LASSERT(descr->cld_obj == NULL);
166 descr->cld_obj = lovsub2cl(r0->lo_sub[i]);
167 descr->cld_start = cl_index(descr->cld_obj, start);
168 descr->cld_end = cl_index(descr->cld_obj, end);
169 descr->cld_mode = lock->cll_descr.cld_mode;
170 descr->cld_gid = lock->cll_descr.cld_gid;
171 descr->cld_enq_flags = lock->cll_descr.cld_enq_flags;
175 /* initialize sub lock */
176 result = lov_sublock_init(env, lock, lls);
180 lls->sub_initialized = 1;
184 LASSERT(ergo(result == 0, nr == lovlck->lls_nr));
187 for (i = 0; i < nr; ++i) {
188 if (!lovlck->lls_sub[i].sub_initialized)
191 cl_lock_fini(env, &lovlck->lls_sub[i].sub_lock);
194 OBD_FREE_LARGE(lovlck,
195 offsetof(struct lov_lock, lls_sub[nr]));
196 lovlck = ERR_PTR(result);
202 static void lov_lock_fini(const struct lu_env *env,
203 struct cl_lock_slice *slice)
205 struct lov_lock *lovlck;
209 lovlck = cl2lov_lock(slice);
210 for (i = 0; i < lovlck->lls_nr; ++i) {
211 LASSERT(!lovlck->lls_sub[i].sub_is_enqueued);
212 if (lovlck->lls_sub[i].sub_initialized)
213 cl_lock_fini(env, &lovlck->lls_sub[i].sub_lock);
215 OBD_FREE_LARGE(lovlck,
216 offsetof(struct lov_lock, lls_sub[lovlck->lls_nr]));
221 * Implementation of cl_lock_operations::clo_enqueue() for lov layer. This
222 * function is rather subtle, as it enqueues top-lock (i.e., advances top-lock
223 * state machine from CLS_QUEUING to CLS_ENQUEUED states) by juggling sub-lock
224 * state machines in the face of sub-locks sharing (by multiple top-locks),
225 * and concurrent sub-lock cancellations.
227 static int lov_lock_enqueue(const struct lu_env *env,
228 const struct cl_lock_slice *slice,
229 struct cl_io *io, struct cl_sync_io *anchor)
231 struct cl_lock *lock = slice->cls_lock;
232 struct lov_lock *lovlck = cl2lov_lock(slice);
238 for (i = 0; i < lovlck->lls_nr; ++i) {
239 struct lov_lock_sub *lls = &lovlck->lls_sub[i];
240 struct lov_sublock_env *subenv;
242 subenv = lov_sublock_env_get(env, lock, lls);
243 if (IS_ERR(subenv)) {
244 rc = PTR_ERR(subenv);
248 rc = cl_lock_enqueue(subenv->lse_env, subenv->lse_io,
249 &lls->sub_lock, anchor);
253 lls->sub_is_enqueued = 1;
258 static void lov_lock_cancel(const struct lu_env *env,
259 const struct cl_lock_slice *slice)
261 struct cl_lock *lock = slice->cls_lock;
262 struct lov_lock *lovlck = cl2lov_lock(slice);
267 for (i = 0; i < lovlck->lls_nr; ++i) {
268 struct lov_lock_sub *lls = &lovlck->lls_sub[i];
269 struct cl_lock *sublock = &lls->sub_lock;
270 struct lov_sublock_env *subenv;
272 if (!lls->sub_is_enqueued)
275 lls->sub_is_enqueued = 0;
276 subenv = lov_sublock_env_get(env, lock, lls);
277 if (!IS_ERR(subenv)) {
278 cl_lock_cancel(subenv->lse_env, sublock);
280 CL_LOCK_DEBUG(D_ERROR, env, slice->cls_lock,
281 "lov_lock_cancel fails with %ld.\n",
287 static int lov_lock_print(const struct lu_env *env, void *cookie,
288 lu_printer_t p, const struct cl_lock_slice *slice)
290 struct lov_lock *lck = cl2lov_lock(slice);
293 (*p)(env, cookie, "%d\n", lck->lls_nr);
294 for (i = 0; i < lck->lls_nr; ++i) {
295 struct lov_lock_sub *sub;
297 sub = &lck->lls_sub[i];
298 (*p)(env, cookie, " %d %x: ", i, sub->sub_is_enqueued);
299 cl_lock_print(env, cookie, p, &sub->sub_lock);
304 static const struct cl_lock_operations lov_lock_ops = {
305 .clo_fini = lov_lock_fini,
306 .clo_enqueue = lov_lock_enqueue,
307 .clo_cancel = lov_lock_cancel,
308 .clo_print = lov_lock_print
311 int lov_lock_init_raid0(const struct lu_env *env, struct cl_object *obj,
312 struct cl_lock *lock, const struct cl_io *io)
314 struct lov_lock *lck;
318 lck = lov_lock_sub_init(env, obj, lock);
320 cl_lock_slice_add(lock, &lck->lls_cl, obj, &lov_lock_ops);
322 result = PTR_ERR(lck);
326 static void lov_empty_lock_fini(const struct lu_env *env,
327 struct cl_lock_slice *slice)
329 struct lov_lock *lck = cl2lov_lock(slice);
330 OBD_SLAB_FREE_PTR(lck, lov_lock_kmem);
333 static int lov_empty_lock_print(const struct lu_env *env, void *cookie,
334 lu_printer_t p, const struct cl_lock_slice *slice)
336 (*p)(env, cookie, "empty\n");
340 /* XXX: more methods will be added later. */
341 static const struct cl_lock_operations lov_empty_lock_ops = {
342 .clo_fini = lov_empty_lock_fini,
343 .clo_print = lov_empty_lock_print
346 int lov_lock_init_empty(const struct lu_env *env, struct cl_object *obj,
347 struct cl_lock *lock, const struct cl_io *io)
349 struct lov_lock *lck;
350 int result = -ENOMEM;
353 OBD_SLAB_ALLOC_PTR_GFP(lck, lov_lock_kmem, GFP_NOFS);
355 cl_lock_slice_add(lock, &lck->lls_cl, obj, &lov_empty_lock_ops);