Changeset 00c2de63 in mainline for uspace/srv/fs/fat/fat.c


Ignore:
Timestamp:
2011-07-29T14:50:22Z (13 years ago)
Author:
Jiří Zárevúcky <zarevucky.jiri@…>
Branches:
lfn, master, serial, ticket/834-toolchain-update, topic/msim-upgrade, topic/simplify-dev-export
Children:
b6759f4
Parents:
6c69d19 (diff), 7ae249d (diff)
Note: this is a merge changeset, the changes displayed below correspond to the merge itself.
Use the (diff) links above to see all the changes relative to each parent.
Message:

Merge libposix.

File:
1 edited

Legend:

Unmodified
Added
Removed

  • uspace/srv/fs/fat/fat.c

    r6c69d19 r00c2de63  
    5656};
    5757
    58 fs_reg_t fat_reg;
    59 
    60 /**
    61  * This connection fibril processes VFS requests from VFS.
    62  *
    63  * In order to support simultaneous VFS requests, our design is as follows.
    64  * The connection fibril accepts VFS requests from VFS. If there is only one
    65  * instance of the fibril, VFS will need to serialize all VFS requests it sends
    66  * to FAT. To overcome this bottleneck, VFS can send FAT the IPC_M_CONNECT_ME_TO
    67  * call. In that case, a new connection fibril will be created, which in turn
    68  * will accept the call. Thus, a new phone will be opened for VFS.
    69  *
    70  * There are few issues with this arrangement. First, VFS can run out of
    71  * available phones. In that case, VFS can close some other phones or use one
    72  * phone for more serialized requests. Similarily, FAT can refuse to duplicate
    73  * the connection. VFS should then just make use of already existing phones and
    74  * route its requests through them. To avoid paying the fibril creation price
    75  * upon each request, FAT might want to keep the connections open after the
    76  * request has been completed.
    77  */
    78 static void fat_connection(ipc_callid_t iid, ipc_call_t *icall, void *arg)
    79 {
    80         if (iid) {
    81                 /*
    82                  * This only happens for connections opened by
    83                  * IPC_M_CONNECT_ME_TO calls as opposed to callback connections
    84                  * created by IPC_M_CONNECT_TO_ME.
    85                  */
    86                 async_answer_0(iid, EOK);
    87         }
    88        
    89         dprintf(NAME ": connection opened\n");
    90        
    91         while (true) {
    92                 ipc_call_t call;
    93                 ipc_callid_t callid = async_get_call(&call);
    94                
    95                 if (!IPC_GET_IMETHOD(call))
    96                         return;
    97                
    98                 switch (IPC_GET_IMETHOD(call)) {
    99                 case VFS_OUT_MOUNTED:
    100                         fat_mounted(callid, &call);
    101                         break;
    102                 case VFS_OUT_MOUNT:
    103                         fat_mount(callid, &call);
    104                         break;
    105                 case VFS_OUT_UNMOUNTED:
    106                         fat_unmounted(callid, &call);
    107                         break;
    108                 case VFS_OUT_UNMOUNT:
    109                         fat_unmount(callid, &call);
    110                         break;
    111                 case VFS_OUT_LOOKUP:
    112                         fat_lookup(callid, &call);
    113                         break;
    114                 case VFS_OUT_READ:
    115                         fat_read(callid, &call);
    116                         break;
    117                 case VFS_OUT_WRITE:
    118                         fat_write(callid, &call);
    119                         break;
    120                 case VFS_OUT_TRUNCATE:
    121                         fat_truncate(callid, &call);
    122                         break;
    123                 case VFS_OUT_STAT:
    124                         fat_stat(callid, &call);
    125                         break;
    126                 case VFS_OUT_CLOSE:
    127                         fat_close(callid, &call);
    128                         break;
    129                 case VFS_OUT_DESTROY:
    130                         fat_destroy(callid, &call);
    131                         break;
    132                 case VFS_OUT_OPEN_NODE:
    133                         fat_open_node(callid, &call);
    134                         break;
    135                 case VFS_OUT_SYNC:
    136                         fat_sync(callid, &call);
    137                         break;
    138                 default:
    139                         async_answer_0(callid, ENOTSUP);
    140                         break;
    141                 }
    142         }
    143 }
    144 
    14558int main(int argc, char **argv)
    14659{
    … …  
    15871        }
    15972       
    160         rc = fs_register(vfs_sess, &fat_reg, &fat_vfs_info, fat_connection);
     73        rc = fs_register(vfs_sess, &fat_vfs_info, &fat_ops, &fat_libfs_ops);
    16174        if (rc != EOK) {
    16275                fat_idx_fini();
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