Re: sys_semget()

ya, i will and i started working !


-Ratna

On Tue, 30 May 2006, William Rizzo wrote:

> ops!...the patch
>
> william
>
> 2006/5/30, William Rizzo <[email protected]>:
>> 
>> Hi Ratna,
>> 
>> Yesterday eavening i ported OM and your patch to the 2.4.30....
>> At attachment you'll find a working 2.4.30 patch...
>> 
>> Can you work on that?
>> 
>> If you insert all the code for select/deselect the Migshm patch, i can
>> port all to the 2.4.32 for tomorrow or Max for Thue.
>> 
>> Cheers,
>> William
>> 
>> 2006/5/30, Ratna Manoj Bolla <[email protected]>:
>> 
>> >
>> > Hi,
>> > I got  a doubt while debugging for my patch.
>> >
>> > please see at line no 1257 below !. (this from fs/inode.c)
>> >
>> > void iput(struct inode *inode)
>> > 1209 {
>> > 1210         if (inode) {
>> > 1211                 struct super_block *sb = inode->i_sb;
>> > 1212                 struct super_operations *op = NULL;
>> > 1213
>> > 1214                 if (inode->i_state == I_CLEAR)
>> > 1215                         BUG();
>> > 1216
>> > 1217                 if (sb && sb->s_op)
>> > 1218                         op = sb->s_op;
>> > 1219                 if (op && op->put_inode)
>> > 1220                         op->put_inode(inode);
>> > 1221
>> > 1222                 if (!atomic_dec_and_lock(&inode->i_count,
>> > &inode_lock))
>> > 1223                         return;
>> > 1224
>> > 1225                 if (!inode->i_nlink) {
>> > 1226                         list_del(&inode->i_list);
>> > 1227                         INIT_LIST_HEAD(&inode->i_list);
>> > 1228                         inode->i_state|=I_FREEING;
>> > 1229                         inodes_stat.nr_inodes--;
>> > 1230                         spin_unlock(&inode_lock);
>> > 1231
>> > 1232                         if (inode->i_data.nrpages)
>> > 1233
>> > truncate_inode_pages(&inode->i_data, 0);
>> > 1234
>> > 1235                         if (op && op->delete_inode) {
>> > 1236                                 void (*delete)(struct inode *) =
>> > op->delete_inode;
>> > 1237                                 if (!is_bad_inode(inode))
>> > 1238                                         DQUOT_INIT(inode);
>> > 1239                                 /* s_op->delete_inode internally
>> > recalls clear_inode() */
>> > 1240                                 delete(inode);
>> > 1241                         } else
>> > 1242                                 clear_inode(inode);
>> > 1243                         spin_lock(&inode_lock);
>> > 1244                         list_del(&inode->i_hash);
>> > 1245                         INIT_LIST_HEAD(&inode->i_hash);
>> > 1246                         spin_unlock(&inode_lock);
>> > 1247                         wake_up(&inode->i_wait);
>> > 1248                         if (inode->i_state != I_CLEAR)
>> > 1249                                 BUG();
>> > 1250                 } else {
>> > 1251                         if (!list_empty(&inode->i_hash)) {
>> > 1252                                 if (!(inode->i_state
>> > &  (I_DIRTY|I_LOCK)))
>> > 1253                                         __refile_inode(inode);
>> > 1254                                 inodes_stat.nr_unused++;
>> > 1255                                 spin_unlock(&inode_lock);
>> > 1256                                 if (!sb || (sb->s_flags &
>> > MS_ACTIVE))
>> > 1257                                         return;
>> >
>> >
>> > Can any body tell what happens if somebody takes a reference to this
>> > inode
>> > with iget() ? [inode has not been deleted from hash list .... even if
>> > some
>> > body took reference here the inode will be cleared for sure .. who(lock
>> > or
>> > semaphore) ensure that this will not heppen ?]
>> >
>> >
>> > 1258                                 write_inode_now(inode, 1);
>> > 1259                                 spin_lock(&inode_lock);
>> > 1260                                 inodes_stat.nr_unused--;
>> > 1261                                 list_del_init(&inode->i_hash);
>> > 1262                         }
>> > 1263                         list_del_init(&inode->i_list);
>> > 1264                         inode->i_state|=I_FREEING;
>> > 1265                         inodes_stat.nr_inodes--;
>> > 1266                         spin_unlock(&inode_lock);
>> > 1267                         if (inode->i_data.nrpages)
>> > 1268
>> > truncate_inode_pages(&inode->i_data, 0);
>> > 1269                         clear_inode(inode);
>> > 1270                 }
>> > 1271                 destroy_inode(inode);
>> > 1272         }
>> > 1273 }
>> >
>> >
>> 
>


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