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NFSv4.1 dereference a disconnected data server client record

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When the last DS io is processed, the data server client record will be
freed.

Signed-off-by: Andy Adamson <andros@netapp.com>
Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Andy Adamson 2012-04-27 17:53:52 -04:00 committed by Trond Myklebust
parent 3a7936c3fc
commit b4a2967e52
3 changed files with 24 additions and 0 deletions
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1
fs/nfs/nfs4filelayout.c
View File

@ -196,6 +196,7 @@ static int filelayout_async_handle_error(struct rpc_task *task,
_pnfs_return_layout(state->inode);
filelayout_mark_devid_invalid(devid);
rpc_wake_up(&tbl->slot_tbl_waitq);
nfs4_ds_disconnect(clp);
/* fall through */
default:
dprintk("%s Retry through MDS. Error %d\n", __func__,

1
fs/nfs/nfs4filelayout.h
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@ -146,5 +146,6 @@ extern void nfs4_fl_put_deviceid(struct nfs4_file_layout_dsaddr *dsaddr);
extern void nfs4_fl_free_deviceid(struct nfs4_file_layout_dsaddr *dsaddr);
struct nfs4_file_layout_dsaddr *
get_device_info(struct inode *inode, struct nfs4_deviceid *dev_id, gfp_t gfp_flags);
void nfs4_ds_disconnect(struct nfs_client *clp);
#endif /* FS_NFS_NFS4FILELAYOUT_H */

22
fs/nfs/nfs4filelayoutdev.c
View File

@ -148,6 +148,28 @@ _data_server_lookup_locked(const struct list_head *dsaddrs)
return NULL;
}
/*
* Lookup DS by nfs_client pointer. Zero data server client pointer
*/
void nfs4_ds_disconnect(struct nfs_client *clp)
{
struct nfs4_pnfs_ds *ds;
struct nfs_client *found = NULL;
dprintk("%s clp %p\n", __func__, clp);
spin_lock(&nfs4_ds_cache_lock);
list_for_each_entry(ds, &nfs4_data_server_cache, ds_node)
if (ds->ds_clp && ds->ds_clp == clp) {
found = ds->ds_clp;
ds->ds_clp = NULL;
}
spin_unlock(&nfs4_ds_cache_lock);
if (found) {
set_bit(NFS_CS_STOP_RENEW, &clp->cl_res_state);
nfs_put_client(clp);
}
}
/*
* Create an rpc connection to the nfs4_pnfs_ds data server
* Currently only supports IPv4 and IPv6 addresses