1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
2 * vim:expandtab:shiftwidth=8:tabstop=8:
4 * Lustre Lite routines to issue a secondary close after writeback
6 * Copyright (c) 2001-2003 Cluster File Systems, Inc.
8 * This file is part of Lustre, http://www.lustre.org.
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.
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.
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.
24 #include <linux/module.h>
26 #define DEBUG_SUBSYSTEM S_LLITE
28 #include <lustre_mdc.h>
29 #include <lustre_lite.h>
30 #include "llite_internal.h"
32 /* record that a write is in flight */
33 void llap_write_pending(struct inode *inode, struct ll_async_page *llap)
35 struct ll_inode_info *lli = ll_i2info(inode);
38 spin_lock(&lli->lli_lock);
39 lli->lli_flags |= LLIF_SOM_DIRTY;
40 if (llap && list_empty(&llap->llap_pending_write))
41 list_add(&llap->llap_pending_write,
42 &lli->lli_pending_write_llaps);
43 spin_unlock(&lli->lli_lock);
47 /* record that a write has completed */
48 int llap_write_complete(struct inode *inode, struct ll_async_page *llap)
50 struct ll_inode_info *lli = ll_i2info(inode);
54 spin_lock(&lli->lli_lock);
55 if (llap && !list_empty(&llap->llap_pending_write)) {
56 list_del_init(&llap->llap_pending_write);
59 spin_unlock(&lli->lli_lock);
63 /* Queue DONE_WRITING if
64 * - done writing is allowed;
65 * - inode has no no dirty pages; */
66 void ll_queue_done_writing(struct inode *inode)
68 struct ll_inode_info *lli = ll_i2info(inode);
70 spin_lock(&lli->lli_lock);
71 if ((lli->lli_flags & LLIF_DONE_WRITING) &&
72 list_empty(&lli->lli_pending_write_llaps)) {
73 struct ll_close_queue *lcq = ll_i2sbi(inode)->ll_lcq;
75 /* DONE_WRITING is allowed and inode has no dirty page. */
76 spin_lock(&lcq->lcq_lock);
77 LASSERT(list_empty(&lli->lli_close_list));
78 CDEBUG(D_INODE, "adding inode %lu/%u to close list\n",
79 inode->i_ino, inode->i_generation);
81 list_add_tail(&lli->lli_close_list, &lcq->lcq_head);
82 wake_up(&lcq->lcq_waitq);
83 spin_unlock(&lcq->lcq_lock);
85 spin_unlock(&lli->lli_lock);
88 /* CLOSE has already occured but has not closed epoch;
89 * Let let DONE_WRITING to happen. */
90 void ll_init_done_writing(struct inode *inode) {
91 struct ll_inode_info *lli = ll_i2info(inode);
92 spin_lock(&lli->lli_lock);
93 if ((lli->lli_flags & LLIF_EPOCH_PENDING))
94 lli->lli_flags |= LLIF_DONE_WRITING;
95 spin_unlock(&lli->lli_lock);
96 ll_queue_done_writing(inode);
99 /* Close epoch and send Size-on-MDS attribute update if possible.
100 * Call this under @lli->lli_lock spinlock. */
101 void ll_epoch_close(struct inode *inode, struct md_op_data *op_data)
103 struct ll_inode_info *lli = ll_i2info(inode);
106 CDEBUG(D_INODE, "Epoch "LPU64" closed on "DFID"\n",
107 op_data->ioepoch, PFID(&lli->lli_fid));
108 op_data->flags |= MF_EPOCH_CLOSE;
110 /* Pack Size-on-MDS inode attributes only if they has changed */
111 if (!(lli->lli_flags & LLIF_SOM_DIRTY))
114 /* There is already 1 pending DONE_WRITE, do not create another one --
115 * close epoch with no attribute change. */
116 if (lli->lli_flags & LLIF_EPOCH_PENDING)
119 op_data->flags |= MF_SOM_CHANGE;
121 /* Check if Size-on-MDS attributes are valid. */
122 if ((lli->lli_flags & LLIF_MDS_SIZE_LOCK) || !ll_local_size(inode)) {
123 /* Send Size-on-MDS Attributes if valid. */
124 op_data->attr.ia_valid |= ATTR_MTIME_SET | ATTR_CTIME_SET |
125 ATTR_SIZE | ATTR_BLOCKS;
131 int ll_sizeonmds_update(struct inode *inode, struct lustre_handle *fh)
133 struct ll_inode_info *lli = ll_i2info(inode);
134 struct md_op_data *op_data;
139 LASSERT(!(lli->lli_flags & LLIF_MDS_SIZE_LOCK));
142 OBD_ALLOC_PTR(op_data);
143 if (!oa || !op_data) {
144 CERROR("can't allocate memory for Size-on-MDS update.\n");
147 rc = ll_inode_getattr(inode, oa);
149 CERROR("inode_getattr failed (%d): unable to send a "
150 "Size-on-MDS attribute update for inode %lu/%u\n",
151 rc, inode->i_ino, inode->i_generation);
154 CDEBUG(D_INODE, "Size-on-MDS update on "DFID"\n", PFID(&lli->lli_fid));
156 md_from_obdo(op_data, oa, oa->o_valid);
157 memcpy(&op_data->handle, fh, sizeof(*fh));
159 op_data->ioepoch = lli->lli_ioepoch;
160 op_data->flags |= MF_SOM_CHANGE;
162 rc = ll_md_setattr(inode, op_data);
168 OBD_FREE_PTR(op_data);
172 /* Send a DONE_WRITING rpc, pack Size-on-MDS attributes into it, if possible */
173 static void ll_done_writing(struct inode *inode)
175 struct ll_inode_info *lli = ll_i2info(inode);
176 struct md_op_data *op_data;
177 struct obd_client_handle *och;
181 OBD_ALLOC_PTR(op_data);
182 if (op_data == NULL) {
183 CERROR("can't allocate op_data\n");
188 spin_lock(&lli->lli_lock);
189 LASSERT(lli->lli_flags & LLIF_SOM_DIRTY);
191 och = lli->lli_pending_och;
192 lli->lli_pending_och = NULL;
193 lli->lli_flags &= ~(LLIF_DONE_WRITING | LLIF_EPOCH_PENDING);
194 ll_epoch_close(inode, op_data);
195 lli->lli_flags &= ~LLIF_SOM_DIRTY;
196 spin_unlock(&lli->lli_lock);
198 ll_pack_inode2opdata(inode, op_data, &och->och_fh);
200 rc = md_done_writing(ll_i2sbi(inode)->ll_md_exp, op_data, och);
201 OBD_FREE_PTR(op_data);
203 /* MDS has instructed us to obtain Size-on-MDS attribute from
204 * OSTs and send setattr to back to MDS. */
205 rc = ll_sizeonmds_update(inode, &och->och_fh);
207 CERROR("inode %lu mdc done_writing failed: rc = %d\n",
214 static struct ll_inode_info *ll_close_next_lli(struct ll_close_queue *lcq)
216 struct ll_inode_info *lli = NULL;
218 spin_lock(&lcq->lcq_lock);
220 if (!list_empty(&lcq->lcq_head)) {
221 lli = list_entry(lcq->lcq_head.next, struct ll_inode_info,
223 list_del_init(&lli->lli_close_list);
224 } else if (atomic_read(&lcq->lcq_stop))
227 spin_unlock(&lcq->lcq_lock);
231 static int ll_close_thread(void *arg)
233 struct ll_close_queue *lcq = arg;
237 char name[CFS_CURPROC_COMM_MAX];
238 snprintf(name, sizeof(name) - 1, "ll_close");
242 complete(&lcq->lcq_comp);
245 struct l_wait_info lwi = { 0 };
246 struct ll_inode_info *lli;
249 l_wait_event_exclusive(lcq->lcq_waitq,
250 (lli = ll_close_next_lli(lcq)) != NULL,
255 inode = ll_info2i(lli);
256 ll_done_writing(inode);
260 complete(&lcq->lcq_comp);
264 int ll_close_thread_start(struct ll_close_queue **lcq_ret)
266 struct ll_close_queue *lcq;
269 OBD_ALLOC(lcq, sizeof(*lcq));
273 spin_lock_init(&lcq->lcq_lock);
274 INIT_LIST_HEAD(&lcq->lcq_head);
275 init_waitqueue_head(&lcq->lcq_waitq);
276 init_completion(&lcq->lcq_comp);
278 pid = kernel_thread(ll_close_thread, lcq, 0);
280 OBD_FREE(lcq, sizeof(*lcq));
284 wait_for_completion(&lcq->lcq_comp);
289 void ll_close_thread_shutdown(struct ll_close_queue *lcq)
291 init_completion(&lcq->lcq_comp);
292 atomic_inc(&lcq->lcq_stop);
293 wake_up(&lcq->lcq_waitq);
294 wait_for_completion(&lcq->lcq_comp);
295 OBD_FREE(lcq, sizeof(*lcq));