#include <linux/sunrpc/sched.h>
#include <linux/sunrpc/clnt.h>
#include <linux/nfs_fs.h>
+#include <linux/sched.h>
+#include <linux/wait.h>
+#include "internal.h"
+#include "nfs4_fs.h"
struct nfs_unlinkdata {
+ struct hlist_node list;
struct nfs_removeargs args;
struct nfs_removeres res;
struct inode *dir;
return 0;
}
-/**
- * nfs_async_unlink_init - Initialize the RPC info
- * task: rpc_task of the sillydelete
- */
-static void nfs_async_unlink_init(struct rpc_task *task, void *calldata)
+static void nfs_free_dname(struct nfs_unlinkdata *data)
{
- struct nfs_unlinkdata *data = calldata;
- struct inode *dir = data->dir;
- struct rpc_message msg = {
- .rpc_argp = &data->args,
- .rpc_resp = &data->res,
- .rpc_cred = data->cred,
- };
+ kfree(data->args.name.name);
+ data->args.name.name = NULL;
+ data->args.name.len = 0;
+}
- nfs_begin_data_update(dir);
- NFS_PROTO(dir)->unlink_setup(&msg, dir);
- rpc_call_setup(task, &msg, 0);
+static void nfs_dec_sillycount(struct inode *dir)
+{
+ struct nfs_inode *nfsi = NFS_I(dir);
+ if (atomic_dec_return(&nfsi->silly_count) == 1)
+ wake_up(&nfsi->waitqueue);
}
/**
if (!NFS_PROTO(dir)->unlink_done(task, dir))
rpc_restart_call(task);
- else
- nfs_end_data_update(dir);
}
/**
static void nfs_async_unlink_release(void *calldata)
{
struct nfs_unlinkdata *data = calldata;
+ struct super_block *sb = data->dir->i_sb;
+
+ nfs_dec_sillycount(data->dir);
nfs_free_unlinkdata(data);
+ nfs_sb_deactive(sb);
}
+#if defined(CONFIG_NFS_V4_1)
+void nfs_unlink_prepare(struct rpc_task *task, void *calldata)
+{
+ struct nfs_unlinkdata *data = calldata;
+ struct nfs_server *server = NFS_SERVER(data->dir);
+
+ if (nfs4_setup_sequence(server->nfs_client, &data->args.seq_args,
+ &data->res.seq_res, 1, task))
+ return;
+ rpc_call_start(task);
+}
+#endif /* CONFIG_NFS_V4_1 */
+
static const struct rpc_call_ops nfs_unlink_ops = {
- .rpc_call_prepare = nfs_async_unlink_init,
.rpc_call_done = nfs_async_unlink_done,
.rpc_release = nfs_async_unlink_release,
+#if defined(CONFIG_NFS_V4_1)
+ .rpc_call_prepare = nfs_unlink_prepare,
+#endif /* CONFIG_NFS_V4_1 */
};
-static int nfs_call_unlink(struct dentry *dentry, struct nfs_unlinkdata *data)
+static int nfs_do_call_unlink(struct dentry *parent, struct inode *dir, struct nfs_unlinkdata *data)
{
+ struct rpc_message msg = {
+ .rpc_argp = &data->args,
+ .rpc_resp = &data->res,
+ .rpc_cred = data->cred,
+ };
+ struct rpc_task_setup task_setup_data = {
+ .rpc_message = &msg,
+ .callback_ops = &nfs_unlink_ops,
+ .callback_data = data,
+ .workqueue = nfsiod_workqueue,
+ .flags = RPC_TASK_ASYNC,
+ };
struct rpc_task *task;
+ struct dentry *alias;
+
+ alias = d_lookup(parent, &data->args.name);
+ if (alias != NULL) {
+ int ret = 0;
+
+ /*
+ * Hey, we raced with lookup... See if we need to transfer
+ * the sillyrename information to the aliased dentry.
+ */
+ nfs_free_dname(data);
+ spin_lock(&alias->d_lock);
+ if (alias->d_inode != NULL &&
+ !(alias->d_flags & DCACHE_NFSFS_RENAMED)) {
+ alias->d_fsdata = data;
+ alias->d_flags |= DCACHE_NFSFS_RENAMED;
+ ret = 1;
+ }
+ spin_unlock(&alias->d_lock);
+ nfs_dec_sillycount(dir);
+ dput(alias);
+ return ret;
+ }
+ data->dir = igrab(dir);
+ if (!data->dir) {
+ nfs_dec_sillycount(dir);
+ return 0;
+ }
+ nfs_sb_active(dir->i_sb);
+ data->args.fh = NFS_FH(dir);
+ nfs_fattr_init(&data->res.dir_attr);
+
+ NFS_PROTO(dir)->unlink_setup(&msg, dir);
+
+ task_setup_data.rpc_client = NFS_CLIENT(dir);
+ task = rpc_run_task(&task_setup_data);
+ if (!IS_ERR(task))
+ rpc_put_task(task);
+ return 1;
+}
+
+static int nfs_call_unlink(struct dentry *dentry, struct nfs_unlinkdata *data)
+{
struct dentry *parent;
struct inode *dir;
+ int ret = 0;
- if (nfs_copy_dname(dentry, data) < 0)
- goto out_free;
parent = dget_parent(dentry);
if (parent == NULL)
goto out_free;
- dir = igrab(parent->d_inode);
+ dir = parent->d_inode;
+ if (nfs_copy_dname(dentry, data) != 0)
+ goto out_dput;
+ /* Non-exclusive lock protects against concurrent lookup() calls */
+ spin_lock(&dir->i_lock);
+ if (atomic_inc_not_zero(&NFS_I(dir)->silly_count) == 0) {
+ /* Deferred delete */
+ hlist_add_head(&data->list, &NFS_I(dir)->silly_list);
+ spin_unlock(&dir->i_lock);
+ ret = 1;
+ goto out_dput;
+ }
+ spin_unlock(&dir->i_lock);
+ ret = nfs_do_call_unlink(parent, dir, data);
+out_dput:
dput(parent);
- if (dir == NULL)
- goto out_free;
+out_free:
+ return ret;
+}
- data->dir = dir;
- data->args.fh = NFS_FH(dir);
- nfs_fattr_init(&data->res.dir_attr);
+void nfs_block_sillyrename(struct dentry *dentry)
+{
+ struct nfs_inode *nfsi = NFS_I(dentry->d_inode);
- task = rpc_run_task(NFS_CLIENT(dir), RPC_TASK_ASYNC, &nfs_unlink_ops, data);
- if (!IS_ERR(task))
- rpc_put_task(task);
- return 1;
-out_free:
- return 0;
+ wait_event(nfsi->waitqueue, atomic_cmpxchg(&nfsi->silly_count, 1, 0) == 1);
+}
+
+void nfs_unblock_sillyrename(struct dentry *dentry)
+{
+ struct inode *dir = dentry->d_inode;
+ struct nfs_inode *nfsi = NFS_I(dir);
+ struct nfs_unlinkdata *data;
+
+ atomic_inc(&nfsi->silly_count);
+ spin_lock(&dir->i_lock);
+ while (!hlist_empty(&nfsi->silly_list)) {
+ if (!atomic_inc_not_zero(&nfsi->silly_count))
+ break;
+ data = hlist_entry(nfsi->silly_list.first, struct nfs_unlinkdata, list);
+ hlist_del(&data->list);
+ spin_unlock(&dir->i_lock);
+ if (nfs_do_call_unlink(dentry, dir, data) == 0)
+ nfs_free_unlinkdata(data);
+ spin_lock(&dir->i_lock);
+ }
+ spin_unlock(&dir->i_lock);
}
/**
if (data == NULL)
goto out;
- data->cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
+ data->cred = rpc_lookup_cred();
if (IS_ERR(data->cred)) {
status = PTR_ERR(data->cred);
goto out_free;
}
+ data->res.seq_res.sr_slotid = NFS4_MAX_SLOT_TABLE;
status = -EBUSY;
spin_lock(&dentry->d_lock);
git://ftp.safe.ca / safe / jmp / linux-2.6 / blobdiff