1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
6 * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.
8 * This program is free software; you can redistribute it and/or modify
9 * it under the terms of the GNU General Public License version 2 only,
10 * as published by the Free Software Foundation.
12 * This program is distributed in the hope that it will be useful, but
13 * WITHOUT ANY WARRANTY; without even the implied warranty of
14 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
15 * General Public License version 2 for more details (a copy is included
16 * in the LICENSE file that accompanied this code).
18 * You should have received a copy of the GNU General Public License
19 * version 2 along with this program; If not, see
20 * http://www.sun.com/software/products/lustre/docs/GPLv2.pdf
22 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa Clara,
23 * CA 95054 USA or visit www.sun.com if you need additional information or
29 * Copyright 2008 Sun Microsystems, Inc. All rights reserved
30 * Use is subject to license terms.
33 * This file is part of Lustre, http://www.lustre.org/
34 * Lustre is a trademark of Sun Microsystems, Inc.
36 * lustre/liblustre/rw.c
38 * Lustre Light block IO
41 #define DEBUG_SUBSYSTEM S_LLITE
47 #include <sys/types.h>
49 #include <sys/queue.h>
64 #include "llite_lib.h"
66 typedef ssize_t llu_file_piov_t(const struct iovec *iovec, int iovlen,
67 _SYSIO_OFF_T pos, ssize_t len,
70 size_t llap_cookie_size;
72 static int llu_lock_to_stripe_offset(struct inode *inode, struct ldlm_lock *lock)
74 struct llu_inode_info *lli = llu_i2info(inode);
75 struct lov_stripe_md *lsm = lli->lli_smd;
76 struct obd_export *exp = llu_i2obdexp(inode);
79 struct ldlm_lock *lock;
80 } key = { .name = KEY_LOCK_TO_STRIPE, .lock = lock };
81 __u32 stripe, vallen = sizeof(stripe);
85 if (lsm->lsm_stripe_count == 1)
88 /* get our offset in the lov */
89 rc = obd_get_info(exp, sizeof(key), &key, &vallen, &stripe, lsm);
91 CERROR("obd_get_info: rc = %d\n", rc);
94 LASSERT(stripe < lsm->lsm_stripe_count);
98 int llu_extent_lock_cancel_cb(struct ldlm_lock *lock,
99 struct ldlm_lock_desc *new, void *data,
102 struct lustre_handle lockh = { 0 };
106 if ((unsigned long)data > 0 && (unsigned long)data < 0x1000) {
107 LDLM_ERROR(lock, "cancelling lock with bad data %p", data);
112 case LDLM_CB_BLOCKING:
113 ldlm_lock2handle(lock, &lockh);
114 rc = ldlm_cli_cancel(&lockh);
116 CERROR("ldlm_cli_cancel failed: %d\n", rc);
118 case LDLM_CB_CANCELING: {
120 struct llu_inode_info *lli;
121 struct lov_stripe_md *lsm;
125 /* This lock wasn't granted, don't try to evict pages */
126 if (lock->l_req_mode != lock->l_granted_mode)
129 inode = llu_inode_from_lock(lock);
132 lli= llu_i2info(inode);
139 stripe = llu_lock_to_stripe_offset(inode, lock);
140 lock_res_and_lock(lock);
141 kms = ldlm_extent_shift_kms(lock,
142 lsm->lsm_oinfo[stripe]->loi_kms);
143 unlock_res_and_lock(lock);
144 if (lsm->lsm_oinfo[stripe]->loi_kms != kms)
145 LDLM_DEBUG(lock, "updating kms from "LPU64" to "LPU64,
146 lsm->lsm_oinfo[stripe]->loi_kms, kms);
147 loi_kms_set(lsm->lsm_oinfo[stripe], kms);
159 static int llu_glimpse_callback(struct ldlm_lock *lock, void *reqp)
161 struct ptlrpc_request *req = reqp;
162 struct inode *inode = llu_inode_from_lock(lock);
163 struct llu_inode_info *lli;
169 GOTO(out, rc = -ELDLM_NO_LOCK_DATA);
170 lli = llu_i2info(inode);
172 GOTO(iput, rc = -ELDLM_NO_LOCK_DATA);
173 if (lli->lli_smd == NULL)
174 GOTO(iput, rc = -ELDLM_NO_LOCK_DATA);
176 /* First, find out which stripe index this lock corresponds to. */
177 if (lli->lli_smd->lsm_stripe_count > 1)
178 stripe = llu_lock_to_stripe_offset(inode, lock);
180 req_capsule_extend(&req->rq_pill, &RQF_LDLM_GL_CALLBACK);
181 req_capsule_set_size(&req->rq_pill, &RMF_DLM_LVB, RCL_SERVER,
183 rc = req_capsule_server_pack(&req->rq_pill);
185 CERROR("failed pack reply: %d\n", rc);
189 lvb = req_capsule_server_get(&req->rq_pill, &RMF_DLM_LVB);
190 lvb->lvb_size = lli->lli_smd->lsm_oinfo[stripe]->loi_kms;
192 LDLM_DEBUG(lock, "i_size: %llu -> stripe number %u -> kms "LPU64,
193 (__u64)llu_i2stat(inode)->st_size, stripe,lvb->lvb_size);
197 /* These errors are normal races, so we don't want to fill the console
198 * with messages by calling ptlrpc_error() */
199 if (rc == -ELDLM_NO_LOCK_DATA)
200 lustre_pack_reply(req, 1, NULL, NULL);
206 int llu_merge_lvb(struct inode *inode)
208 struct llu_inode_info *lli = llu_i2info(inode);
209 struct llu_sb_info *sbi = llu_i2sbi(inode);
210 struct intnl_stat *st = llu_i2stat(inode);
215 inode_init_lvb(inode, &lvb);
216 rc = obd_merge_lvb(sbi->ll_dt_exp, lli->lli_smd, &lvb, 0);
217 st->st_size = lvb.lvb_size;
218 st->st_blocks = lvb.lvb_blocks;
219 /* handle st_blocks overflow gracefully */
220 if (st->st_blocks < lvb.lvb_blocks)
221 st->st_blocks = ~0UL;
222 st->st_mtime = lvb.lvb_mtime;
223 st->st_atime = lvb.lvb_atime;
224 st->st_ctime = lvb.lvb_ctime;
229 int llu_extent_lock(struct ll_file_data *fd, struct inode *inode,
230 struct lov_stripe_md *lsm, int mode,
231 ldlm_policy_data_t *policy, struct lustre_handle *lockh,
234 struct llu_sb_info *sbi = llu_i2sbi(inode);
235 struct intnl_stat *st = llu_i2stat(inode);
236 struct ldlm_enqueue_info einfo = { 0 };
237 struct obd_info oinfo = { { { 0 } } };
242 LASSERT(!lustre_handle_is_used(lockh));
243 CLASSERT(ELDLM_OK == 0);
245 /* XXX phil: can we do this? won't it screw the file size up? */
246 if ((fd && (fd->fd_flags & LL_FILE_IGNORE_LOCK)) ||
247 (sbi->ll_flags & LL_SBI_NOLCK) || mode == LCK_NL)
250 CDEBUG(D_DLMTRACE, "Locking inode %llu, start "LPU64" end "LPU64"\n",
251 (__u64)st->st_ino, policy->l_extent.start,
252 policy->l_extent.end);
254 einfo.ei_type = LDLM_EXTENT;
255 einfo.ei_mode = mode;
256 einfo.ei_cb_bl = llu_extent_lock_cancel_cb;
257 einfo.ei_cb_cp = ldlm_completion_ast;
258 einfo.ei_cb_gl = llu_glimpse_callback;
259 einfo.ei_cbdata = inode;
261 oinfo.oi_policy = *policy;
262 oinfo.oi_lockh = lockh;
264 oinfo.oi_flags = ast_flags;
266 rc = obd_enqueue(sbi->ll_dt_exp, &oinfo, &einfo, NULL);
267 *policy = oinfo.oi_policy;
271 inode_init_lvb(inode, &lvb);
272 obd_merge_lvb(sbi->ll_dt_exp, lsm, &lvb, 1);
273 if (policy->l_extent.start == 0 &&
274 policy->l_extent.end == OBD_OBJECT_EOF)
275 st->st_size = lvb.lvb_size;
278 st->st_mtime = lvb.lvb_mtime;
279 st->st_atime = lvb.lvb_atime;
280 st->st_ctime = lvb.lvb_ctime;
286 int llu_extent_unlock(struct ll_file_data *fd, struct inode *inode,
287 struct lov_stripe_md *lsm, int mode,
288 struct lustre_handle *lockh)
290 struct llu_sb_info *sbi = llu_i2sbi(inode);
294 CLASSERT(ELDLM_OK == 0);
296 /* XXX phil: can we do this? won't it screw the file size up? */
297 if ((fd && (fd->fd_flags & LL_FILE_IGNORE_LOCK)) ||
298 (sbi->ll_flags & LL_SBI_NOLCK) || mode == LCK_NL)
301 rc = obd_cancel(sbi->ll_dt_exp, lsm, mode, lockh);
307 ssize_t llu_file_prwv(const struct iovec *iovec, int iovlen,
308 _SYSIO_OFF_T pos, ssize_t len,
311 struct llu_io_session *session = (struct llu_io_session *) private;
312 struct inode *inode = session->lis_inode;
313 struct llu_inode_info *lli = llu_i2info(inode);
321 /* in a large iov read/write we'll be repeatedly called.
322 * so give a chance to answer cancel ast here
324 liblustre_wait_event(0);
326 if (len == 0 || iovlen == 0)
329 if (pos + len > lli->lli_maxbytes)
332 env = cl_env_get(&refcheck);
334 RETURN(PTR_ERR(env));
336 io = &ccc_env_info(env)->cti_io;
338 if (cl_io_rw_init(env, io, session->lis_cmd == OBD_BRW_WRITE?CIT_WRITE:
342 sio = slp_env_io(env);
343 cio = ccc_env_io(env);
344 /* XXX this is not right: cio->cui_iov can be modified. */
345 cio->cui_iov = (struct iovec *)iovec;
346 cio->cui_nrsegs = iovlen;
347 sio->sio_session = session;
348 err = cl_io_loop(env, io);
354 cl_env_put(env, &refcheck);
363 struct llu_io_session *get_io_session(struct inode *ino, int ngroups, int cmd)
365 struct llu_io_session *session;
367 OBD_ALLOC_PTR(session);
372 session->lis_inode = ino;
373 session->lis_max_groups = ngroups;
374 session->lis_cmd = cmd;
378 static void put_io_session(struct llu_io_session *session)
380 I_RELE(session->lis_inode);
381 OBD_FREE_PTR(session);
384 static int llu_file_rwx(struct inode *ino,
388 struct llu_io_session *session;
390 int cmd = read ? OBD_BRW_READ : OBD_BRW_WRITE;
393 LASSERT(ioctx->ioctx_xtvlen >= 0);
394 LASSERT(ioctx->ioctx_iovlen >= 0);
396 liblustre_wait_event(0);
398 if (!ioctx->ioctx_xtvlen)
401 /* XXX consider other types later */
402 if (S_ISDIR(llu_i2stat(ino)->st_mode))
404 if (!S_ISREG(llu_i2stat(ino)->st_mode))
407 session = get_io_session(ino, ioctx->ioctx_xtvlen * 2, cmd);
411 cc = _sysio_enumerate_extents(ioctx->ioctx_xtv, ioctx->ioctx_xtvlen,
412 ioctx->ioctx_iov, ioctx->ioctx_iovlen,
413 llu_file_prwv, session);
416 LASSERT(!ioctx->ioctx_cc);
417 ioctx->ioctx_private = session;
420 put_io_session(session);
423 liblustre_wait_event(0);
427 void llu_io_init(struct cl_io *io, struct inode *inode, int write)
429 struct llu_inode_info *lli = llu_i2info(inode);
431 memset(io, 0, sizeof *io);
433 io->u.ci_rw.crw_nonblock = lli->lli_open_flags & O_NONBLOCK;
435 io->u.ci_wr.wr_append = lli->lli_open_flags & O_APPEND;
436 io->ci_obj = llu_i2info(inode)->lli_clob;
438 if ((lli->lli_open_flags & O_APPEND) && write)
439 io->ci_lockreq = CILR_MANDATORY;
441 io->ci_lockreq = CILR_NEVER;
444 int llu_iop_read(struct inode *ino,
447 struct intnl_stat *st = llu_i2stat(ino);
454 st->st_atime = CFS_CURRENT_TIME;
456 env = cl_env_get(&refcheck);
458 RETURN(PTR_ERR(env));
460 io = &ccc_env_info(env)->cti_io;
461 llu_io_init(io, ino, 0);
463 ret = llu_file_rwx(ino, ioctx, 1);
465 cl_env_put(env, &refcheck);
469 int llu_iop_write(struct inode *ino,
472 struct intnl_stat *st = llu_i2stat(ino);
478 st->st_mtime = st->st_ctime = CFS_CURRENT_TIME;
480 env = cl_env_get(&refcheck);
482 RETURN(PTR_ERR(env));
484 io = &ccc_env_info(env)->cti_io;
485 llu_io_init(io, ino, 1);
487 ret = llu_file_rwx(ino, ioctx, 0);
488 cl_env_put(env, &refcheck);
492 int llu_iop_iodone(struct ioctx *ioctx)
494 struct llu_io_session *session;
500 liblustre_wait_event(0);
502 env = cl_env_get(&refcheck);
504 RETURN(PTR_ERR(env));
506 io = &ccc_env_info(env)->cti_io;
508 cl_env_put(env, &refcheck);
509 session = (struct llu_io_session *) ioctx->ioctx_private;
511 LASSERT(!IS_ERR(session));
513 if (session->lis_rc == 0) {
514 ioctx->ioctx_cc = session->lis_rwcount;
516 LASSERT(session->lis_rc < 0);
517 ioctx->ioctx_cc = -1;
518 ioctx->ioctx_errno = -session->lis_rc;
521 put_io_session(session);
522 ioctx->ioctx_private = NULL;
523 liblustre_wait_event(0);