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authorTrond Myklebust <Trond.Myklebust@netapp.com>2007-07-14 15:39:58 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2007-07-19 15:21:39 -0400
commite4eff1a622edd6ab7b73acd5d8763aa2fa3fee49 (patch)
tree257d6675733d4af122a77054281e1d7d5062d904
parent4fdc17b2a7f4d9db5b08e0f963d0027f714e4104 (diff)
downloadlinux-linaro-e4eff1a622edd6ab7b73acd5d8763aa2fa3fee49.tar.gz
SUNRPC: Clean up the sillyrename code
Fix a couple of bugs: - Don't rely on the parent dentry still being valid when the call completes. Fixes a race with shrink_dcache_for_umount_subtree() - Don't remove the file if the filehandle has been labelled as stale. Fix a couple of inefficiencies - Remove the global list of sillyrenamed files. Instead we can cache the sillyrename information in the dentry->d_fsdata - Move common code from unlink_setup/unlink_done into fs/nfs/unlink.c Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
-rw-r--r--fs/nfs/dir.c4
-rw-r--r--fs/nfs/nfs3proc.c38
-rw-r--r--fs/nfs/nfs4proc.c50
-rw-r--r--fs/nfs/proc.c26
-rw-r--r--fs/nfs/unlink.c195
-rw-r--r--include/linux/nfs_fs.h4
-rw-r--r--include/linux/nfs_xdr.h5
7 files changed, 120 insertions, 202 deletions
diff --git a/fs/nfs/dir.c b/fs/nfs/dir.c
index 0fa1dbcdadb..ea97408e423 100644
--- a/fs/nfs/dir.c
+++ b/fs/nfs/dir.c
@@ -869,7 +869,7 @@ static void nfs_dentry_iput(struct dentry *dentry, struct inode *inode)
if (dentry->d_flags & DCACHE_NFSFS_RENAMED) {
lock_kernel();
drop_nlink(inode);
- nfs_complete_unlink(dentry);
+ nfs_complete_unlink(dentry, inode);
unlock_kernel();
}
/* When creating a negative dentry, we want to renew d_time */
@@ -1411,7 +1411,7 @@ static int nfs_sillyrename(struct inode *dir, struct dentry *dentry)
nfs_renew_times(dentry);
nfs_set_verifier(dentry, nfs_save_change_attribute(dir));
d_move(dentry, sdentry);
- error = nfs_async_unlink(dentry);
+ error = nfs_async_unlink(dir, dentry);
/* If we return 0 we don't unlink */
}
dput(sdentry);
diff --git a/fs/nfs/nfs3proc.c b/fs/nfs/nfs3proc.c
index eac07f2c99d..c7ca5d70870 100644
--- a/fs/nfs/nfs3proc.c
+++ b/fs/nfs/nfs3proc.c
@@ -370,41 +370,21 @@ nfs3_proc_remove(struct inode *dir, struct qstr *name)
return status;
}
-static int
-nfs3_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir, struct qstr *name)
+static void
+nfs3_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
{
- struct unlinkxdr {
- struct nfs_removeargs arg;
- struct nfs_removeres res;
- } *ptr;
-
- ptr = kmalloc(sizeof(*ptr), GFP_KERNEL);
- if (!ptr)
- return -ENOMEM;
- ptr->arg.fh = NFS_FH(dir->d_inode);
- ptr->arg.name.name = name->name;
- ptr->arg.name.len = name->len;
- nfs_fattr_init(&ptr->res.dir_attr);
msg->rpc_proc = &nfs3_procedures[NFS3PROC_REMOVE];
- msg->rpc_argp = &ptr->arg;
- msg->rpc_resp = &ptr->res;
- return 0;
}
static int
-nfs3_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
+nfs3_proc_unlink_done(struct rpc_task *task, struct inode *dir)
{
- struct rpc_message *msg = &task->tk_msg;
- struct nfs_fattr *dir_attr;
-
- if (nfs3_async_handle_jukebox(task, dir->d_inode))
- return 1;
- if (msg->rpc_argp) {
- dir_attr = &((struct nfs_removeres*)msg->rpc_resp)->dir_attr;
- nfs_post_op_update_inode(dir->d_inode, dir_attr);
- kfree(msg->rpc_argp);
- }
- return 0;
+ struct nfs_removeres *res;
+ if (nfs3_async_handle_jukebox(task, dir))
+ return 0;
+ res = task->tk_msg.rpc_resp;
+ nfs_post_op_update_inode(dir, &res->dir_attr);
+ return 1;
}
static int
diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c
index 23dc25dbc6f..6ca2795ccd9 100644
--- a/fs/nfs/nfs4proc.c
+++ b/fs/nfs/nfs4proc.c
@@ -1962,48 +1962,26 @@ static int nfs4_proc_remove(struct inode *dir, struct qstr *name)
return err;
}
-struct unlink_desc {
- struct nfs_removeargs args;
- struct nfs_removeres res;
-};
-
-static int nfs4_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir,
- struct qstr *name)
+static void nfs4_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
{
- struct nfs_server *server = NFS_SERVER(dir->d_inode);
- struct unlink_desc *up;
+ struct nfs_server *server = NFS_SERVER(dir);
+ struct nfs_removeargs *args = msg->rpc_argp;
+ struct nfs_removeres *res = msg->rpc_resp;
- up = kmalloc(sizeof(*up), GFP_KERNEL);
- if (!up)
- return -ENOMEM;
-
- up->args.fh = NFS_FH(dir->d_inode);
- up->args.name.len = name->len;
- up->args.name.name = name->name;
- up->args.bitmask = server->attr_bitmask;
- up->res.server = server;
- nfs_fattr_init(&up->res.dir_attr);
-
+ args->bitmask = server->attr_bitmask;
+ res->server = server;
msg->rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_REMOVE];
- msg->rpc_argp = &up->args;
- msg->rpc_resp = &up->res;
- return 0;
}
-static int nfs4_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
+static int nfs4_proc_unlink_done(struct rpc_task *task, struct inode *dir)
{
- struct rpc_message *msg = &task->tk_msg;
- struct unlink_desc *up;
-
- if (msg->rpc_resp != NULL) {
- up = container_of(msg->rpc_resp, struct unlink_desc, res);
- update_changeattr(dir->d_inode, &up->res.cinfo);
- nfs_post_op_update_inode(dir->d_inode, &up->res.dir_attr);
- kfree(up);
- msg->rpc_resp = NULL;
- msg->rpc_argp = NULL;
- }
- return 0;
+ struct nfs_removeres *res = task->tk_msg.rpc_resp;
+
+ if (nfs4_async_handle_error(task, res->server) == -EAGAIN)
+ return 0;
+ update_changeattr(dir, &res->cinfo);
+ nfs_post_op_update_inode(dir, &res->dir_attr);
+ return 1;
}
static int _nfs4_proc_rename(struct inode *old_dir, struct qstr *old_name,
diff --git a/fs/nfs/proc.c b/fs/nfs/proc.c
index 3b3eb692e0f..845cdde1d8b 100644
--- a/fs/nfs/proc.c
+++ b/fs/nfs/proc.c
@@ -291,32 +291,16 @@ nfs_proc_remove(struct inode *dir, struct qstr *name)
return status;
}
-static int
-nfs_proc_unlink_setup(struct rpc_message *msg, struct dentry *dir, struct qstr *name)
+static void
+nfs_proc_unlink_setup(struct rpc_message *msg, struct inode *dir)
{
- struct nfs_removeargs *arg;
-
- arg = kmalloc(sizeof(*arg), GFP_KERNEL);
- if (!arg)
- return -ENOMEM;
- arg->fh = NFS_FH(dir->d_inode);
- arg->name.name = name->name;
- arg->name.len = name->len;
msg->rpc_proc = &nfs_procedures[NFSPROC_REMOVE];
- msg->rpc_argp = arg;
- return 0;
}
-static int
-nfs_proc_unlink_done(struct dentry *dir, struct rpc_task *task)
+static int nfs_proc_unlink_done(struct rpc_task *task, struct inode *dir)
{
- struct rpc_message *msg = &task->tk_msg;
-
- if (msg->rpc_argp) {
- nfs_mark_for_revalidate(dir->d_inode);
- kfree(msg->rpc_argp);
- }
- return 0;
+ nfs_mark_for_revalidate(dir);
+ return 1;
}
static int
diff --git a/fs/nfs/unlink.c b/fs/nfs/unlink.c
index 0e28189c215..045ab805c17 100644
--- a/fs/nfs/unlink.c
+++ b/fs/nfs/unlink.c
@@ -3,7 +3,6 @@
*
* nfs sillydelete handling
*
- * NOTE: we rely on holding the BKL for list manipulation protection.
*/
#include <linux/slab.h>
@@ -15,46 +14,23 @@
struct nfs_unlinkdata {
- struct nfs_unlinkdata *next;
- struct dentry *dir, *dentry;
- struct qstr name;
- struct rpc_task task;
+ struct nfs_removeargs args;
+ struct nfs_removeres res;
+ struct inode *dir;
struct rpc_cred *cred;
- unsigned int count;
};
-static struct nfs_unlinkdata *nfs_deletes;
-static RPC_WAITQ(nfs_delete_queue, "nfs_delete_queue");
-
-/**
- * nfs_detach_unlinkdata - Remove asynchronous unlink from global list
- * @data: pointer to descriptor
- */
-static inline void
-nfs_detach_unlinkdata(struct nfs_unlinkdata *data)
-{
- struct nfs_unlinkdata **q;
-
- for (q = &nfs_deletes; *q != NULL; q = &((*q)->next)) {
- if (*q == data) {
- *q = data->next;
- break;
- }
- }
-}
-
/**
- * nfs_put_unlinkdata - release data from a sillydelete operation.
+ * nfs_free_unlinkdata - release data from a sillydelete operation.
* @data: pointer to unlink structure.
*/
static void
-nfs_put_unlinkdata(struct nfs_unlinkdata *data)
+nfs_free_unlinkdata(struct nfs_unlinkdata *data)
{
- if (--data->count == 0) {
- nfs_detach_unlinkdata(data);
- kfree(data->name.name);
- kfree(data);
- }
+ iput(data->dir);
+ put_rpccred(data->cred);
+ kfree(data->args.name.name);
+ kfree(data);
}
#define NAME_ALLOC_LEN(len) ((len+16) & ~15)
@@ -63,50 +39,36 @@ nfs_put_unlinkdata(struct nfs_unlinkdata *data)
* @dentry: pointer to dentry
* @data: nfs_unlinkdata
*/
-static inline void
-nfs_copy_dname(struct dentry *dentry, struct nfs_unlinkdata *data)
+static int nfs_copy_dname(struct dentry *dentry, struct nfs_unlinkdata *data)
{
char *str;
int len = dentry->d_name.len;
- str = kmalloc(NAME_ALLOC_LEN(len), GFP_KERNEL);
+ str = kmemdup(dentry->d_name.name, NAME_ALLOC_LEN(len), GFP_KERNEL);
if (!str)
- return;
- memcpy(str, dentry->d_name.name, len);
- if (!data->name.len) {
- data->name.len = len;
- data->name.name = str;
- } else
- kfree(str);
+ return -ENOMEM;
+ data->args.name.len = len;
+ data->args.name.name = str;
+ return 0;
}
/**
* nfs_async_unlink_init - Initialize the RPC info
- * @task: rpc_task of the sillydelete
- *
- * We delay initializing RPC info until after the call to dentry_iput()
- * in order to minimize races against rename().
+ * task: rpc_task of the sillydelete
*/
static void nfs_async_unlink_init(struct rpc_task *task, void *calldata)
{
- struct nfs_unlinkdata *data = calldata;
- struct dentry *dir = data->dir;
- struct rpc_message msg = {
- .rpc_cred = data->cred,
+ 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,
};
- int status = -ENOENT;
-
- if (!data->name.len)
- goto out_err;
- status = NFS_PROTO(dir->d_inode)->unlink_setup(&msg, dir, &data->name);
- if (status < 0)
- goto out_err;
- nfs_begin_data_update(dir->d_inode);
+ nfs_begin_data_update(dir);
+ NFS_PROTO(dir)->unlink_setup(&msg, dir);
rpc_call_setup(task, &msg, 0);
- return;
- out_err:
- rpc_exit(task, status);
}
/**
@@ -117,19 +79,13 @@ static void nfs_async_unlink_init(struct rpc_task *task, void *calldata)
*/
static void nfs_async_unlink_done(struct rpc_task *task, void *calldata)
{
- struct nfs_unlinkdata *data = calldata;
- struct dentry *dir = data->dir;
- struct inode *dir_i;
-
- if (!dir)
- return;
- dir_i = dir->d_inode;
- nfs_end_data_update(dir_i);
- if (NFS_PROTO(dir_i)->unlink_done(dir, task))
- return;
- put_rpccred(data->cred);
- data->cred = NULL;
- dput(dir);
+ struct nfs_unlinkdata *data = calldata;
+ struct inode *dir = data->dir;
+
+ if (!NFS_PROTO(dir)->unlink_done(task, dir))
+ rpc_restart_call(task);
+ else
+ nfs_end_data_update(dir);
}
/**
@@ -142,7 +98,7 @@ static void nfs_async_unlink_done(struct rpc_task *task, void *calldata)
static void nfs_async_unlink_release(void *calldata)
{
struct nfs_unlinkdata *data = calldata;
- nfs_put_unlinkdata(data);
+ nfs_free_unlinkdata(data);
}
static const struct rpc_call_ops nfs_unlink_ops = {
@@ -151,73 +107,94 @@ static const struct rpc_call_ops nfs_unlink_ops = {
.rpc_release = nfs_async_unlink_release,
};
+static int nfs_call_unlink(struct dentry *dentry, struct nfs_unlinkdata *data)
+{
+ struct rpc_task *task;
+ struct dentry *parent;
+ struct inode *dir;
+
+ 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);
+ dput(parent);
+ if (dir == NULL)
+ goto out_free;
+
+ data->dir = dir;
+ data->args.fh = NFS_FH(dir);
+ nfs_fattr_init(&data->res.dir_attr);
+
+ 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;
+}
+
/**
* nfs_async_unlink - asynchronous unlinking of a file
+ * @dir: parent directory of dentry
* @dentry: dentry to unlink
*/
int
-nfs_async_unlink(struct dentry *dentry)
+nfs_async_unlink(struct inode *dir, struct dentry *dentry)
{
- struct dentry *dir = dentry->d_parent;
- struct nfs_unlinkdata *data;
- struct rpc_clnt *clnt = NFS_CLIENT(dir->d_inode);
- int status = -ENOMEM;
+ struct nfs_unlinkdata *data;
+ int status = -ENOMEM;
data = kzalloc(sizeof(*data), GFP_KERNEL);
- if (!data)
+ if (data == NULL)
goto out;
- data->cred = rpcauth_lookupcred(clnt->cl_auth, 0);
+ data->cred = rpcauth_lookupcred(NFS_CLIENT(dir)->cl_auth, 0);
if (IS_ERR(data->cred)) {
status = PTR_ERR(data->cred);
goto out_free;
}
- data->dir = dget(dir);
- data->dentry = dentry;
-
- data->next = nfs_deletes;
- nfs_deletes = data;
- data->count = 1;
-
- rpc_init_task(&data->task, clnt, RPC_TASK_ASYNC, &nfs_unlink_ops, data);
+ status = -EBUSY;
spin_lock(&dentry->d_lock);
+ if (dentry->d_flags & DCACHE_NFSFS_RENAMED)
+ goto out_unlock;
dentry->d_flags |= DCACHE_NFSFS_RENAMED;
+ dentry->d_fsdata = data;
spin_unlock(&dentry->d_lock);
-
- rpc_sleep_on(&nfs_delete_queue, &data->task, NULL, NULL);
- status = 0;
- out:
- return status;
+ return 0;
+out_unlock:
+ spin_unlock(&dentry->d_lock);
+ put_rpccred(data->cred);
out_free:
kfree(data);
+out:
return status;
}
/**
* nfs_complete_unlink - Initialize completion of the sillydelete
* @dentry: dentry to delete
+ * @inode: inode
*
* Since we're most likely to be called by dentry_iput(), we
* only use the dentry to find the sillydelete. We then copy the name
* into the qstr.
*/
void
-nfs_complete_unlink(struct dentry *dentry)
+nfs_complete_unlink(struct dentry *dentry, struct inode *inode)
{
- struct nfs_unlinkdata *data;
+ struct nfs_unlinkdata *data = NULL;
- for(data = nfs_deletes; data != NULL; data = data->next) {
- if (dentry == data->dentry)
- break;
- }
- if (!data)
- return;
- data->count++;
- nfs_copy_dname(dentry, data);
spin_lock(&dentry->d_lock);
- dentry->d_flags &= ~DCACHE_NFSFS_RENAMED;
+ if (dentry->d_flags & DCACHE_NFSFS_RENAMED) {
+ dentry->d_flags &= ~DCACHE_NFSFS_RENAMED;
+ data = dentry->d_fsdata;
+ }
spin_unlock(&dentry->d_lock);
- rpc_wake_up_task(&data->task);
- nfs_put_unlinkdata(data);
+
+ if (data != NULL && (NFS_STALE(inode) || !nfs_call_unlink(dentry, data)))
+ nfs_free_unlinkdata(data);
}
diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h
index c098ae194f7..9ba4aec37c5 100644
--- a/include/linux/nfs_fs.h
+++ b/include/linux/nfs_fs.h
@@ -407,8 +407,8 @@ extern void nfs_release_automount_timer(void);
/*
* linux/fs/nfs/unlink.c
*/
-extern int nfs_async_unlink(struct dentry *);
-extern void nfs_complete_unlink(struct dentry *);
+extern int nfs_async_unlink(struct inode *dir, struct dentry *dentry);
+extern void nfs_complete_unlink(struct dentry *dentry, struct inode *);
/*
* linux/fs/nfs/write.c
diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h
index 7babcb16300..cf74a4db84a 100644
--- a/include/linux/nfs_xdr.h
+++ b/include/linux/nfs_xdr.h
@@ -791,9 +791,8 @@ struct nfs_rpc_ops {
int (*create) (struct inode *, struct dentry *,
struct iattr *, int, struct nameidata *);
int (*remove) (struct inode *, struct qstr *);
- int (*unlink_setup) (struct rpc_message *,
- struct dentry *, struct qstr *);
- int (*unlink_done) (struct dentry *, struct rpc_task *);
+ void (*unlink_setup) (struct rpc_message *, struct inode *dir);
+ int (*unlink_done) (struct rpc_task *, struct inode *);
int (*rename) (struct inode *, struct qstr *,
struct inode *, struct qstr *);
int (*link) (struct inode *, struct inode *, struct qstr *);