lustre/llite/rw24.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  * Lustre Lite I/O page cache for the 2.4 kernel version
   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/config.h>
  25 #include <linux/kernel.h>
  26 #include <linux/mm.h>
  27 #include <linux/string.h>
  28 #include <linux/stat.h>
  29 #include <linux/errno.h>
  30 #include <linux/smp_lock.h>
  31 #include <linux/unistd.h>
  32 #include <linux/version.h>
  33 #include <asm/system.h>
  34 #include <asm/uaccess.h>
  35
  36 #include <linux/fs.h>
  37 #include <linux/iobuf.h>
  38 #include <linux/stat.h>
  39 #include <asm/uaccess.h>
  40 #include <asm/segment.h>
  41 #include <linux/mm.h>
  42 #include <linux/pagemap.h>
  43 #include <linux/smp_lock.h>
  44
  45 #define DEBUG_SUBSYSTEM S_LLITE
  46
  47 #include <linux/lustre_mds.h>
  48 #include <linux/lustre_lite.h>
  49 #include "llite_internal.h"
  50 #include <linux/lustre_compat25.h>
  51
  52 /* called for each page in a completed rpc.*/
  53 void ll_ap_completion_24(void *data, int cmd, int rc)
  54 {
  55         struct ll_async_page *llap;
  56         struct page *page;
  57         ENTRY;
  58
  59         llap = llap_from_cookie(data);
  60         if (IS_ERR(llap)) {
  61                 EXIT;
  62                 return;
  63         }
  64
  65         page = llap->llap_page;
  66         LASSERT(PageLocked(page));
  67
  68         LL_CDEBUG_PAGE(D_PAGE, page, "completing cmd %d with %d\n", cmd, rc);
  69
  70         if (rc == 0)  {
  71                 if (cmd == OBD_BRW_READ) {
  72                         if (!llap->llap_defer_uptodate)
  73                                 SetPageUptodate(page);
  74                 } else {
  75                         llap->llap_write_queued = 0;
  76                 }
  77                 ClearPageError(page);
  78         } else {
  79                 if (cmd == OBD_BRW_READ)
  80                         llap->llap_defer_uptodate = 0;
  81                 SetPageError(page);
  82         }
  83
  84
  85         unlock_page(page);
  86
  87         if (0 && cmd == OBD_BRW_WRITE) {
  88                 llap_write_complete(page->mapping->host, llap);
  89                 ll_try_done_writing(page->mapping->host);
  90         }
  91
  92         page_cache_release(page);
  93         EXIT;
  94 }
  95
  96 static int ll_writepage_24(struct page *page)
  97 {
  98         struct inode *inode = page->mapping->host;
  99         struct obd_export *exp;
 100         struct ll_async_page *llap;
 101         int rc = 0;
 102         ENTRY;
 103
 104         LASSERT(!PageDirty(page));
 105         LASSERT(PageLocked(page));
 106
 107         exp = ll_i2obdexp(inode);
 108         if (exp == NULL)
 109                 GOTO(out, rc = -EINVAL);
 110
 111         llap = llap_from_page(page);
 112         if (IS_ERR(llap))
 113                 GOTO(out, rc = PTR_ERR(llap));
 114
 115         page_cache_get(page);
 116         if (llap->llap_write_queued) {
 117                 LL_CDEBUG_PAGE(D_PAGE, page, "marking urgent\n");
 118                 rc = obd_set_async_flags(exp, ll_i2info(inode)->lli_smd, NULL,
 119                                          llap->llap_cookie,
 120                                          ASYNC_READY | ASYNC_URGENT);
 121         } else {
 122                 llap->llap_write_queued = 1;
 123                 rc = obd_queue_async_io(exp, ll_i2info(inode)->lli_smd, NULL,
 124                                         llap->llap_cookie, OBD_BRW_WRITE, 0, 0,
 125                                         0, ASYNC_READY | ASYNC_URGENT);
 126                 if (rc == 0)
 127                         LL_CDEBUG_PAGE(D_PAGE, page, "mmap write queued\n");
 128                 else
 129                         llap->llap_write_queued = 0;
 130         }
 131         if (rc)
 132                 page_cache_release(page);
 133 out:
 134         if (rc)
 135                 unlock_page(page);
 136         RETURN(rc);
 137 }
 138
 139 static int ll_direct_IO_24(int rw,
 140 #ifdef HAVE_DIO_FILE
 141                            struct file *file,
 142 #else
 143                            struct inode *inode,
 144 #endif
 145                            struct kiobuf *iobuf, unsigned long blocknr,
 146                            int blocksize)
 147 {
 148 #ifdef HAVE_DIO_FILE
 149         struct inode *inode = file->f_dentry->d_inode;
 150 #endif
 151         struct ll_inode_info *lli = ll_i2info(inode);
 152         struct lov_stripe_md *lsm = lli->lli_smd;
 153         struct brw_page *pga;
 154         struct ptlrpc_request_set *set;
 155         struct obdo oa;
 156         int length, i, flags, rc = 0;
 157         loff_t offset;
 158         ENTRY;
 159
 160         if (!lsm || !lsm->lsm_object_id)
 161                 RETURN(-EBADF);
 162
 163         /* FIXME: io smaller than PAGE_SIZE is broken on ia64 */
 164         if ((iobuf->offset & (PAGE_SIZE - 1)) ||
 165             (iobuf->length & (PAGE_SIZE - 1)))
 166                 RETURN(-EINVAL);
 167
 168         set = ptlrpc_prep_set();
 169         if (set == NULL)
 170                 RETURN(-ENOMEM);
 171
 172         OBD_ALLOC(pga, sizeof(*pga) * iobuf->nr_pages);
 173         if (!pga) {
 174                 ptlrpc_set_destroy(set);
 175                 RETURN(-ENOMEM);
 176         }
 177
 178         flags = 0 /* | OBD_BRW_DIRECTIO */;
 179         offset = ((obd_off)blocknr << inode->i_blkbits);
 180         length = iobuf->length;
 181
 182         for (i = 0, length = iobuf->length; length > 0;
 183              length -= pga[i].count, offset += pga[i].count, i++) { /*i last!*/
 184                 pga[i].pg = iobuf->maplist[i];
 185                 pga[i].off = offset;
 186                 /* To the end of the page, or the length, whatever is less */
 187                 pga[i].count = min_t(int, PAGE_SIZE - (offset & ~PAGE_MASK),
 188                                      length);
 189                 pga[i].flag = flags;
 190                 if (rw == READ)
 191                         POISON_PAGE(iobuf->maplist[i], 0x0d);
 192         }
 193
 194         ll_inode_fill_obdo(inode, rw, &oa);
 195
 196         if (rw == WRITE)
 197                 lprocfs_counter_add(ll_i2sbi(inode)->ll_stats,
 198                                     LPROC_LL_DIRECT_WRITE, iobuf->length);
 199         else
 200                 lprocfs_counter_add(ll_i2sbi(inode)->ll_stats,
 201                                     LPROC_LL_DIRECT_READ, iobuf->length);
 202         rc = obd_brw_async(rw == WRITE ? OBD_BRW_WRITE : OBD_BRW_READ,
 203                            ll_i2obdexp(inode), &oa, lsm, iobuf->nr_pages, pga,
 204                            set, NULL);
 205         if (rc) {
 206                 CDEBUG(rc == -ENOSPC ? D_INODE : D_ERROR,
 207                        "error from obd_brw_async: rc = %d\n", rc);
 208         } else {
 209                 rc = ptlrpc_set_wait(set);
 210                 if (rc)
 211                         CERROR("error from callback: rc = %d\n", rc);
 212         }
 213         ptlrpc_set_destroy(set);
 214         if (rc == 0) {
 215                 rc = iobuf->length;
 216                 obdo_to_inode(inode, &oa, OBD_MD_FLBLOCKS);
 217         }
 218
 219         OBD_FREE(pga, sizeof(*pga) * iobuf->nr_pages);
 220         RETURN(rc);
 221 }
 222
 223 struct address_space_operations ll_aops = {
 224         readpage: ll_readpage,
 225         direct_IO: ll_direct_IO_24,
 226         writepage: ll_writepage_24,
 227         prepare_write: ll_prepare_write,
 228         commit_write: ll_commit_write,
 229         removepage: ll_removepage,
 230         sync_page: NULL,
 231         bmap: NULL
 232 };