fs/intermezzo/inode.c

   1 /* -*- mode: c; c-basic-offset: 8; indent-tabs-mode: nil; -*-
   2  * vim:expandtab:shiftwidth=8:tabstop=8:
   3  *
   4  *  Copyright (C) 1996 Peter J. Braam <braam@maths.ox.ac.uk> and
   5  *    Michael Callahan <callahan@maths.ox.ac.uk>
   6  *  Copyright (C) 1999 Carnegie Mellon University
   7  *    Rewritten for Linux 2.1.  Peter Braam <braam@cs.cmu.edu>
   8  *
   9  *   This file is part of InterMezzo, http://www.inter-mezzo.org.
  10  *
  11  *   InterMezzo is free software; you can redistribute it and/or
  12  *   modify it under the terms of version 2 of the GNU General Public
  13  *   License as published by the Free Software Foundation.
  14  *
  15  *   InterMezzo is distributed in the hope that it will be useful,
  16  *   but WITHOUT ANY WARRANTY; without even the implied warranty of
  17  *   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18  *   GNU General Public License for more details.
  19  *
  20  *   You should have received a copy of the GNU General Public License
  21  *   along with InterMezzo; if not, write to the Free Software
  22  *   Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
  23  *
  24  * Super block/filesystem wide operations
  25  */
  26
  27 #include <linux/module.h>
  28 #include <linux/kernel.h>
  29 #include <linux/mm.h>
  30 #include <linux/string.h>
  31 #include <linux/stat.h>
  32 #include <linux/errno.h>
  33 #include <linux/unistd.h>
  34
  35 #include <asm/system.h>
  36 #include <asm/uaccess.h>
  37
  38 #include <linux/fs.h>
  39 #include <linux/slab.h>
  40 #include <linux/vmalloc.h>
  41 #include <asm/segment.h>
  42
  43 #include "intermezzo_fs.h"
  44 #include "intermezzo_psdev.h"
  45
  46 extern void presto_free_cache(struct presto_cache *);
  47
  48 void presto_set_ops(struct inode *inode, struct  filter_fs *filter)
  49 {
  50         ENTRY;
  51
  52         if (!inode || is_bad_inode(inode))
  53                 return;
  54
  55         if (S_ISREG(inode->i_mode)) {
  56                 if ( !filter_c2cfiops(filter) ) {
  57                        filter_setup_file_ops(filter,
  58                                              inode, &presto_file_iops,
  59                                              &presto_file_fops);
  60                 }
  61                 inode->i_op = filter_c2ufiops(filter);
  62                 inode->i_fop = filter_c2uffops(filter);
  63                 CDEBUG(D_INODE, "set file methods for %ld to %p\n",
  64                        inode->i_ino, inode->i_op);
  65         } else if (S_ISDIR(inode->i_mode)) {
  66                 inode->i_op = filter_c2udiops(filter);
  67                 inode->i_fop = filter_c2udfops(filter);
  68                 CDEBUG(D_INODE, "set dir methods for %ld to %p ioctl %p\n",
  69                        inode->i_ino, inode->i_op, inode->i_fop->ioctl);
  70         } else if (S_ISLNK(inode->i_mode)) {
  71                 if ( !filter_c2csiops(filter)) {
  72                         filter_setup_symlink_ops(filter,
  73                                                  inode,
  74                                                  &presto_sym_iops,
  75                                                  &presto_sym_fops);
  76                 }
  77                 inode->i_op = filter_c2usiops(filter);
  78                 inode->i_fop = filter_c2usfops(filter);
  79                 CDEBUG(D_INODE, "set link methods for %ld to %p\n",
  80                        inode->i_ino, inode->i_op);
  81         }
  82         EXIT;
  83 }
  84
  85 void presto_read_inode(struct inode *inode)
  86 {
  87         struct presto_cache *cache;
  88
  89         cache = presto_get_cache(inode);
  90         if ( !cache ) {
  91                 CERROR("PRESTO: BAD, BAD: cannot find cache\n");
  92                 make_bad_inode(inode);
  93                 return ;
  94         }
  95
  96         filter_c2csops(cache->cache_filter)->read_inode(inode);
  97
  98         CDEBUG(D_INODE, "presto_read_inode: ino %ld, gid %d\n",
  99                inode->i_ino, inode->i_gid);
 100
 101         presto_set_ops(inode, cache->cache_filter);
 102         /* XXX handle special inodes here or not - probably not? */
 103 }
 104
 105 static void presto_put_super(struct super_block *sb)
 106 {
 107         struct presto_cache *cache;
 108         struct upc_channel *channel;
 109         struct super_operations *sops;
 110         struct list_head *lh;
 111         int err;
 112
 113         ENTRY;
 114         cache = presto_cache_find(sb);
 115         if (!cache) {
 116                 EXIT;
 117                 goto exit;
 118         }
 119         channel = &izo_channels[presto_c2m(cache)];
 120         sops = filter_c2csops(cache->cache_filter);
 121         err = izo_clear_all_fsetroots(cache);
 122         if (err) {
 123                 CERROR("%s: err %d\n", __FUNCTION__, err);
 124         }
 125         PRESTO_FREE(cache->cache_vfsmount, sizeof(struct vfsmount));
 126
 127         /* look at kill_super - fsync_super is not exported GRRR but
 128            probably not needed */
 129         unlock_super(sb);
 130         shrink_dcache_parent(cache->cache_root);
 131         dput(cache->cache_root);
 132         //fsync_super(sb);
 133         lock_super(sb);
 134
 135         if (sops->write_super)
 136                 sops->write_super(sb);
 137
 138         if (sops->put_super)
 139                 sops->put_super(sb);
 140
 141         /* free any remaining async upcalls when the filesystem is unmounted */
 142         spin_lock(&channel->uc_lock);
 143         lh = channel->uc_pending.next;
 144         while ( lh != &channel->uc_pending) {
 145                 struct upc_req *req;
 146                 req = list_entry(lh, struct upc_req, rq_chain);
 147
 148                 /* assignment must be here: we are about to free &lh */
 149                 lh = lh->next;
 150                 if ( ! (req->rq_flags & REQ_ASYNC) )
 151                         continue;
 152                 list_del(&(req->rq_chain));
 153                 PRESTO_FREE(req->rq_data, req->rq_bufsize);
 154                 PRESTO_FREE(req, sizeof(struct upc_req));
 155         }
 156         list_del(&cache->cache_channel_list);
 157         spin_unlock(&channel->uc_lock);
 158
 159         presto_free_cache(cache);
 160
 161 exit:
 162         CDEBUG(D_MALLOC, "after umount: kmem %ld, vmem %ld\n",
 163                presto_kmemory, presto_vmemory);
 164         return ;
 165 }
 166
 167 struct super_operations presto_super_ops = {
 168         .read_inode    = presto_read_inode,
 169         .put_super     = presto_put_super,
 170 };
 171
 172
 173 /* symlinks can be chowned */
 174 struct inode_operations presto_sym_iops = {
 175         .setattr       = presto_setattr
 176 };
 177
 178 /* NULL for now */
 179 struct file_operations presto_sym_fops;