lustre/llite/llite_close.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * Lustre Lite routines to issue a secondary close after writeback
   5  *
   6  *  Copyright (c) 2001-2003 Cluster File Systems, Inc.
   7  *
   8  *   This file is part of Lustre, http://www.lustre.org.
   9  *
  10  *   Lustre is free software; you can redistribute it and/or
  11  *   modify it under the terms of version 2 of the GNU General Public
  12  *   License as published by the Free Software Foundation.
  13  *
  14  *   Lustre is distributed in the hope that it will be useful,
  15  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  16  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17  *   GNU General Public License for more details.
  18  *
  19  *   You should have received a copy of the GNU General Public License
  20  *   along with Lustre; if not, write to the Free Software
  21  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  22  */
  23
  24 #include <linux/module.h>
  25
  26 #define DEBUG_SUBSYSTEM S_LLITE
  27
  28 #include <lustre_lite.h>
  29 #include "llite_internal.h"
  30
  31 /* record that a write is in flight */
  32 void llap_write_pending(struct inode *inode, struct ll_async_page *llap)
  33 {
  34         struct ll_inode_info *lli = ll_i2info(inode);
  35         spin_lock(&lli->lli_lock);
  36         list_add(&llap->llap_pending_write, &lli->lli_pending_write_llaps);
  37         spin_unlock(&lli->lli_lock);
  38 }
  39
  40 /* record that a write has completed */
  41 void llap_write_complete(struct inode *inode, struct ll_async_page *llap)
  42 {
  43         struct ll_inode_info *lli = ll_i2info(inode);
  44         spin_lock(&lli->lli_lock);
  45         list_del_init(&llap->llap_pending_write);
  46         spin_unlock(&lli->lli_lock);
  47 }
  48
  49 void ll_open_complete(struct inode *inode)
  50 {
  51         struct ll_inode_info *lli = ll_i2info(inode);
  52         spin_lock(&lli->lli_lock);
  53         lli->lli_send_done_writing = 0;
  54         spin_unlock(&lli->lli_lock);
  55 }
  56
  57 /* if we close with writes in flight then we want the completion or cancelation
  58  * of those writes to send a DONE_WRITING rpc to the MDS */
  59 int ll_is_inode_dirty(struct inode *inode)
  60 {
  61         struct ll_inode_info *lli = ll_i2info(inode);
  62         int rc = 0;
  63         ENTRY;
  64
  65         spin_lock(&lli->lli_lock);
  66         if (!list_empty(&lli->lli_pending_write_llaps))
  67                 rc = 1;
  68         spin_unlock(&lli->lli_lock);
  69         RETURN(rc);
  70 }
  71
  72 void ll_try_done_writing(struct inode *inode)
  73 {
  74         struct ll_inode_info *lli = ll_i2info(inode);
  75         struct ll_close_queue *lcq = ll_i2sbi(inode)->ll_lcq;
  76
  77         spin_lock(&lli->lli_lock);
  78
  79         if (lli->lli_send_done_writing &&
  80             list_empty(&lli->lli_pending_write_llaps)) {
  81
  82                 spin_lock(&lcq->lcq_lock);
  83                 if (list_empty(&lli->lli_close_item)) {
  84                         CDEBUG(D_INODE, "adding inode %lu/%u to close list\n",
  85                                inode->i_ino, inode->i_generation);
  86                         igrab(inode);
  87                         list_add_tail(&lli->lli_close_item, &lcq->lcq_list);
  88                         wake_up(&lcq->lcq_waitq);
  89                 }
  90                 spin_unlock(&lcq->lcq_lock);
  91         }
  92
  93         spin_unlock(&lli->lli_lock);
  94 }
  95
  96 /* The MDS needs us to get the real file attributes, then send a DONE_WRITING */
  97 void ll_queue_done_writing(struct inode *inode)
  98 {
  99         struct ll_inode_info *lli = ll_i2info(inode);
 100         ENTRY;
 101
 102         spin_lock(&lli->lli_lock);
 103         lli->lli_send_done_writing = 1;
 104         spin_unlock(&lli->lli_lock);
 105
 106         ll_try_done_writing(inode);
 107         EXIT;
 108 }
 109
 110 #if 0
 111 /* If we know the file size and have the cookies:
 112  *  - send a DONE_WRITING rpc
 113  *
 114  * Otherwise:
 115  *  - get a whole-file lock
 116  *  - get the authoritative size and all cookies with GETATTRs
 117  *  - send a DONE_WRITING rpc
 118  */
 119 static void ll_close_done_writing(struct inode *inode)
 120 {
 121         struct ll_inode_info *lli = ll_i2info(inode);
 122         ldlm_policy_data_t policy = { .l_extent = {0, OBD_OBJECT_EOF } };
 123         struct lustre_handle lockh = { 0 };
 124         struct obdo obdo;
 125         obd_flag valid;
 126         int rc, ast_flags = 0;
 127         ENTRY;
 128
 129         memset(&obdo, 0, sizeof(obdo));
 130         if (test_bit(LLI_F_HAVE_OST_SIZE_LOCK, &lli->lli_flags))
 131                 goto rpc;
 132
 133         rc = ll_extent_lock(NULL, inode, lli->lli_smd, LCK_PW, &policy, &lockh,
 134                             ast_flags);
 135         if (rc != 0) {
 136                 CERROR("lock acquisition failed (%d): unable to send "
 137                        "DONE_WRITING for inode %lu/%u\n", rc, inode->i_ino,
 138                        inode->i_generation);
 139                 GOTO(out, rc);
 140         }
 141
 142         rc = ll_lsm_getattr(ll_i2obdexp(inode), lli->lli_smd, &obdo);
 143         if (rc) {
 144                 CERROR("inode_getattr failed (%d): unable to send DONE_WRITING "
 145                        "for inode %lu/%u\n", rc, inode->i_ino,
 146                        inode->i_generation);
 147                 ll_extent_unlock(NULL, inode, lli->lli_smd, LCK_PW, &lockh);
 148                 GOTO(out, rc);
 149         }
 150
 151         obdo_refresh_inode(inode, &obdo, valid);
 152
 153         CDEBUG(D_INODE, "objid "LPX64" size %Lu, blocks %lu, blksize %lu\n",
 154                lli->lli_smd->lsm_object_id, inode->i_size, inode->i_blocks,
 155                1<<inode->i_blkbits);
 156
 157         set_bit(LLI_F_HAVE_OST_SIZE_LOCK, &lli->lli_flags);
 158
 159         rc = ll_extent_unlock(NULL, inode, lli->lli_smd, LCK_PW, &lockh);
 160         if (rc != ELDLM_OK)
 161                 CERROR("unlock failed (%d)?  proceeding anyways...\n", rc);
 162
 163  rpc:
 164         obdo.o_id = inode->i_ino;
 165         obdo.o_size = inode->i_size;
 166         obdo.o_blocks = inode->i_blocks;
 167         obdo.o_valid = OBD_MD_FLID | OBD_MD_FLSIZE | OBD_MD_FLBLOCKS;
 168
 169         rc = mdc_done_writing(ll_i2sbi(inode)->ll_mdc_exp, &obdo);
 170  out:
 171 }
 172 #endif
 173
 174 static struct ll_inode_info *ll_close_next_lli(struct ll_close_queue *lcq)
 175 {
 176         struct ll_inode_info *lli = NULL;
 177
 178         spin_lock(&lcq->lcq_lock);
 179
 180         if (lcq->lcq_list.next == NULL)
 181                 lli = ERR_PTR(-1);
 182         else if (!list_empty(&lcq->lcq_list)) {
 183                 lli = list_entry(lcq->lcq_list.next, struct ll_inode_info,
 184                                  lli_close_item);
 185                 list_del(&lli->lli_close_item);
 186         }
 187
 188         spin_unlock(&lcq->lcq_lock);
 189         return lli;
 190 }
 191
 192 static int ll_close_thread(void *arg)
 193 {
 194         struct ll_close_queue *lcq = arg;
 195         ENTRY;
 196
 197         {
 198                 char name[CFS_CURPROC_COMM_MAX];
 199                 snprintf(name, sizeof(name) - 1, "ll_close");
 200                 cfs_daemonize(name);
 201         }
 202
 203         complete(&lcq->lcq_comp);
 204
 205         while (1) {
 206                 struct l_wait_info lwi = { 0 };
 207                 struct ll_inode_info *lli;
 208                 //struct inode *inode;
 209
 210                 l_wait_event_exclusive(lcq->lcq_waitq,
 211                                        (lli = ll_close_next_lli(lcq)) != NULL,
 212                                        &lwi);
 213                 if (IS_ERR(lli))
 214                         break;
 215
 216                 //inode = ll_info2i(lli);
 217                 //ll_close_done_writing(inode);
 218                 //iput(inode);
 219         }
 220
 221         complete(&lcq->lcq_comp);
 222         RETURN(0);
 223 }
 224
 225 int ll_close_thread_start(struct ll_close_queue **lcq_ret)
 226 {
 227         struct ll_close_queue *lcq;
 228         pid_t pid;
 229
 230         OBD_ALLOC(lcq, sizeof(*lcq));
 231         if (lcq == NULL)
 232                 return -ENOMEM;
 233
 234         spin_lock_init(&lcq->lcq_lock);
 235         INIT_LIST_HEAD(&lcq->lcq_list);
 236         init_waitqueue_head(&lcq->lcq_waitq);
 237         init_completion(&lcq->lcq_comp);
 238
 239         pid = kernel_thread(ll_close_thread, lcq, 0);
 240         if (pid < 0) {
 241                 OBD_FREE(lcq, sizeof(*lcq));
 242                 return pid;
 243         }
 244
 245         wait_for_completion(&lcq->lcq_comp);
 246         *lcq_ret = lcq;
 247         return 0;
 248 }
 249
 250 void ll_close_thread_shutdown(struct ll_close_queue *lcq)
 251 {
 252         init_completion(&lcq->lcq_comp);
 253         lcq->lcq_list.next = NULL;
 254         wake_up(&lcq->lcq_waitq);
 255         wait_for_completion(&lcq->lcq_comp);
 256         OBD_FREE(lcq, sizeof(*lcq));
 257 }