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NFS: Cleanup of NFS read code 

Same callback hierarchy inversion as for the NFS write calls. This patch is
not strictly speaking needed by the O_DIRECT code, but avoids confusing
differences between the asynchronous read and write code.

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
This commit is contained in:
Trond Myklebust 2006-03-20 13:44:27 -05:00
parent 788e7a89a0
commit ec06c096ed
7 changed files with 77 additions and 89 deletions
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17
fs/nfs/direct.c
View File

@ -218,14 +218,17 @@ static struct nfs_direct_req *nfs_direct_read_alloc(size_t nbytes, unsigned int
* until the RPCs complete. This could be long *after* we are woken up in
* nfs_direct_read_wait (for instance, if someone hits ^C on a slow server).
*/
static void nfs_direct_read_result(struct nfs_read_data *data, int status)
static void nfs_direct_read_result(struct rpc_task *task, void *calldata)
{
struct nfs_read_data *data = calldata;
struct nfs_direct_req *dreq = (struct nfs_direct_req *) data->req;
if (likely(status >= 0))
if (nfs_readpage_result(task, data) != 0)
return;
if (likely(task->tk_status >= 0))
atomic_add(data->res.count, &dreq->count);
else
atomic_set(&dreq->error, status);
atomic_set(&dreq->error, task->tk_status);
if (unlikely(atomic_dec_and_test(&dreq->complete))) {
nfs_free_user_pages(dreq->pages, dreq->npages, 1);
@ -234,6 +237,11 @@ static void nfs_direct_read_result(struct nfs_read_data *data, int status)
}
}
static const struct rpc_call_ops nfs_read_direct_ops = {
.rpc_call_done = nfs_direct_read_result,
.rpc_release = nfs_readdata_release,
};
/**
* nfs_direct_read_schedule - dispatch NFS READ operations for a direct read
* @dreq: address of nfs_direct_req struct for this request
@ -280,10 +288,11 @@ static void nfs_direct_read_schedule(struct nfs_direct_req *dreq,
data->res.eof = 0;
data->res.count = bytes;
rpc_init_task(&data->task, NFS_CLIENT(inode), RPC_TASK_ASYNC,
&nfs_read_direct_ops, data);
NFS_PROTO(inode)->read_setup(data);
data->task.tk_cookie = (unsigned long) inode;
data->complete = nfs_direct_read_result;
lock_kernel();
rpc_execute(&data->task);

27
fs/nfs/nfs3proc.c
View File

@ -811,29 +811,18 @@ nfs3_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
extern u32 *nfs3_decode_dirent(u32 *, struct nfs_entry *, int);
static void nfs3_read_done(struct rpc_task *task, void *calldata)
static int nfs3_read_done(struct rpc_task *task, struct nfs_read_data *data)
{
struct nfs_read_data *data = calldata;
if (nfs3_async_handle_jukebox(task, data->inode))
return;
return -EAGAIN;
/* Call back common NFS readpage processing */
if (task->tk_status >= 0)
nfs_refresh_inode(data->inode, &data->fattr);
nfs_readpage_result(task, calldata);
return 0;
}
static const struct rpc_call_ops nfs3_read_ops = {
.rpc_call_done = nfs3_read_done,
.rpc_release = nfs_readdata_release,
};
static void
nfs3_proc_read_setup(struct nfs_read_data *data)
static void nfs3_proc_read_setup(struct nfs_read_data *data)
{
struct rpc_task *task = &data->task;
struct inode *inode = data->inode;
int flags;
struct rpc_message msg = {
.rpc_proc = &nfs3_procedures[NFS3PROC_READ],
.rpc_argp = &data->args,
@ -841,12 +830,7 @@ nfs3_proc_read_setup(struct nfs_read_data *data)
.rpc_cred = data->cred,
};
/* N.B. Do we need to test? Never called for swapfile inode */
flags = RPC_TASK_ASYNC | (IS_SWAPFILE(inode)? NFS_RPC_SWAPFLAGS : 0);
/* Finalize the task. */
rpc_init_task(task, NFS_CLIENT(inode), flags, &nfs3_read_ops, data);
rpc_call_setup(task, &msg, 0);
rpc_call_setup(&data->task, &msg, 0);
}
static int nfs3_write_done(struct rpc_task *task, struct nfs_write_data *data)
@ -935,6 +919,7 @@ struct nfs_rpc_ops nfs_v3_clientops = {
.pathconf = nfs3_proc_pathconf,
.decode_dirent = nfs3_decode_dirent,
.read_setup = nfs3_proc_read_setup,
.read_done = nfs3_read_done,
.write_setup = nfs3_proc_write_setup,
.write_done = nfs3_write_done,
.commit_setup = nfs3_proc_commit_setup,

33
fs/nfs/nfs4proc.c
View File

@ -2345,47 +2345,31 @@ static int nfs4_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
return err;
}
static void nfs4_read_done(struct rpc_task *task, void *calldata)
static int nfs4_read_done(struct rpc_task *task, struct nfs_read_data *data)
{
struct nfs_read_data *data = calldata;
struct inode *inode = data->inode;
struct nfs_server *server = NFS_SERVER(data->inode);
if (nfs4_async_handle_error(task, NFS_SERVER(inode)) == -EAGAIN) {
if (nfs4_async_handle_error(task, server) == -EAGAIN) {
rpc_restart_call(task);
return;
return -EAGAIN;
}
if (task->tk_status > 0)
renew_lease(NFS_SERVER(inode), data->timestamp);
/* Call back common NFS readpage processing */
nfs_readpage_result(task, calldata);
renew_lease(server, data->timestamp);
return 0;
}
static const struct rpc_call_ops nfs4_read_ops = {
.rpc_call_done = nfs4_read_done,
.rpc_release = nfs_readdata_release,
};
static void
nfs4_proc_read_setup(struct nfs_read_data *data)
static void nfs4_proc_read_setup(struct nfs_read_data *data)
{
struct rpc_task *task = &data->task;
struct rpc_message msg = {
.rpc_proc = &nfs4_procedures[NFSPROC4_CLNT_READ],
.rpc_argp = &data->args,
.rpc_resp = &data->res,
.rpc_cred = data->cred,
};
struct inode *inode = data->inode;
int flags;
data->timestamp = jiffies;
/* N.B. Do we need to test? Never called for swapfile inode */
flags = RPC_TASK_ASYNC | (IS_SWAPFILE(inode)? NFS_RPC_SWAPFLAGS : 0);
/* Finalize the task. */
rpc_init_task(task, NFS_CLIENT(inode), flags, &nfs4_read_ops, data);
rpc_call_setup(task, &msg, 0);
rpc_call_setup(&data->task, &msg, 0);
}
static int nfs4_write_done(struct rpc_task *task, struct nfs_write_data *data)
@ -3617,6 +3601,7 @@ struct nfs_rpc_ops nfs_v4_clientops = {
.pathconf = nfs4_proc_pathconf,
.decode_dirent = nfs4_decode_dirent,
.read_setup = nfs4_proc_read_setup,
.read_done = nfs4_read_done,
.write_setup = nfs4_proc_write_setup,
.write_done = nfs4_write_done,
.commit_setup = nfs4_proc_commit_setup,

25
fs/nfs/proc.c
View File

@ -613,10 +613,8 @@ nfs_proc_pathconf(struct nfs_server *server, struct nfs_fh *fhandle,
extern u32 * nfs_decode_dirent(u32 *, struct nfs_entry *, int);
static void nfs_read_done(struct rpc_task *task, void *calldata)
static int nfs_read_done(struct rpc_task *task, struct nfs_read_data *data)
{
struct nfs_read_data *data = calldata;
if (task->tk_status >= 0) {
nfs_refresh_inode(data->inode, data->res.fattr);
/* Emulate the eof flag, which isn't normally needed in NFSv2
@ -625,20 +623,11 @@ static void nfs_read_done(struct rpc_task *task, void *calldata)
if (data->args.offset + data->args.count >= data->res.fattr->size)
data->res.eof = 1;
}
nfs_readpage_result(task, calldata);
return 0;
}
static const struct rpc_call_ops nfs_read_ops = {
.rpc_call_done = nfs_read_done,
.rpc_release = nfs_readdata_release,
};
static void
nfs_proc_read_setup(struct nfs_read_data *data)
static void nfs_proc_read_setup(struct nfs_read_data *data)
{
struct rpc_task *task = &data->task;
struct inode *inode = data->inode;
int flags;
struct rpc_message msg = {
.rpc_proc = &nfs_procedures[NFSPROC_READ],
.rpc_argp = &data->args,
@ -646,12 +635,7 @@ nfs_proc_read_setup(struct nfs_read_data *data)
.rpc_cred = data->cred,
};
/* N.B. Do we need to test? Never called for swapfile inode */
flags = RPC_TASK_ASYNC | (IS_SWAPFILE(inode)? NFS_RPC_SWAPFLAGS : 0);
/* Finalize the task. */
rpc_init_task(task, NFS_CLIENT(inode), flags, &nfs_read_ops, data);
rpc_call_setup(task, &msg, 0);
rpc_call_setup(&data->task, &msg, 0);
}
static int nfs_write_done(struct rpc_task *task, struct nfs_write_data *data)
@ -720,6 +704,7 @@ struct nfs_rpc_ops nfs_v2_clientops = {
.pathconf = nfs_proc_pathconf,
.decode_dirent = nfs_decode_dirent,
.read_setup = nfs_proc_read_setup,
.read_done = nfs_read_done,
.write_setup = nfs_proc_write_setup,
.write_done = nfs_write_done,
.commit_setup = nfs_proc_commit_setup,

58
fs/nfs/read.c
View File

@ -36,8 +36,8 @@
#define NFSDBG_FACILITY NFSDBG_PAGECACHE
static int nfs_pagein_one(struct list_head *, struct inode *);
static void nfs_readpage_result_partial(struct nfs_read_data *, int);
static void nfs_readpage_result_full(struct nfs_read_data *, int);
static const struct rpc_call_ops nfs_read_partial_ops;
static const struct rpc_call_ops nfs_read_full_ops;
static kmem_cache_t *nfs_rdata_cachep;
mempool_t *nfs_rdata_mempool;
@ -200,9 +200,11 @@ static void nfs_readpage_release(struct nfs_page *req)
* Set up the NFS read request struct
*/
static void nfs_read_rpcsetup(struct nfs_page *req, struct nfs_read_data *data,
const struct rpc_call_ops *call_ops,
unsigned int count, unsigned int offset)
{
struct inode *inode;
int flags;
data->req = req;
data->inode = inode = req->wb_context->dentry->d_inode;
@ -220,6 +222,9 @@ static void nfs_read_rpcsetup(struct nfs_page *req, struct nfs_read_data *data,
data->res.eof = 0;
nfs_fattr_init(&data->fattr);
/* Set up the initial task struct. */
flags = RPC_TASK_ASYNC | (IS_SWAPFILE(inode)? NFS_RPC_SWAPFLAGS : 0);
rpc_init_task(&data->task, NFS_CLIENT(inode), flags, call_ops, data);
NFS_PROTO(inode)->read_setup(data);
data->task.tk_cookie = (unsigned long)inode;
@ -307,14 +312,15 @@ static int nfs_pagein_multi(struct list_head *head, struct inode *inode)
list_del_init(&data->pages);
data->pagevec[0] = page;
data->complete = nfs_readpage_result_partial;
if (nbytes > rsize) {
nfs_read_rpcsetup(req, data, rsize, offset);
nfs_read_rpcsetup(req, data, &nfs_read_partial_ops,
rsize, offset);
offset += rsize;
nbytes -= rsize;
} else {
nfs_read_rpcsetup(req, data, nbytes, offset);
nfs_read_rpcsetup(req, data, &nfs_read_partial_ops,
nbytes, offset);
nbytes = 0;
}
nfs_execute_read(data);
@ -360,8 +366,7 @@ static int nfs_pagein_one(struct list_head *head, struct inode *inode)
}
req = nfs_list_entry(data->pages.next);
data->complete = nfs_readpage_result_full;
nfs_read_rpcsetup(req, data, count, 0);
nfs_read_rpcsetup(req, data, &nfs_read_full_ops, count, 0);
nfs_execute_read(data);
return 0;
@ -395,12 +400,15 @@ nfs_pagein_list(struct list_head *head, int rpages)
/*
* Handle a read reply that fills part of a page.
*/
static void nfs_readpage_result_partial(struct nfs_read_data *data, int status)
static void nfs_readpage_result_partial(struct rpc_task *task, void *calldata)
{
struct nfs_read_data *data = calldata;
struct nfs_page *req = data->req;
struct page *page = req->wb_page;
if (status >= 0) {
if (nfs_readpage_result(task, data) != 0)
return;
if (task->tk_status >= 0) {
unsigned int request = data->args.count;
unsigned int result = data->res.count;
@ -419,20 +427,28 @@ static void nfs_readpage_result_partial(struct nfs_read_data *data, int status)
}
}
static const struct rpc_call_ops nfs_read_partial_ops = {
.rpc_call_done = nfs_readpage_result_partial,
.rpc_release = nfs_readdata_release,
};
/*
* This is the callback from RPC telling us whether a reply was
* received or some error occurred (timeout or socket shutdown).
*/
static void nfs_readpage_result_full(struct nfs_read_data *data, int status)
static void nfs_readpage_result_full(struct rpc_task *task, void *calldata)
{
struct nfs_read_data *data = calldata;
unsigned int count = data->res.count;
if (nfs_readpage_result(task, data) != 0)
return;
while (!list_empty(&data->pages)) {
struct nfs_page *req = nfs_list_entry(data->pages.next);
struct page *page = req->wb_page;
nfs_list_remove_request(req);
if (status >= 0) {
if (task->tk_status >= 0) {
if (count < PAGE_CACHE_SIZE) {
if (count < req->wb_bytes)
memclear_highpage_flush(page,
@ -448,19 +464,27 @@ static void nfs_readpage_result_full(struct nfs_read_data *data, int status)
}
}
static const struct rpc_call_ops nfs_read_full_ops = {
.rpc_call_done = nfs_readpage_result_full,
.rpc_release = nfs_readdata_release,
};
/*
* This is the callback from RPC telling us whether a reply was
* received or some error occurred (timeout or socket shutdown).
*/
void nfs_readpage_result(struct rpc_task *task, void *calldata)
int nfs_readpage_result(struct rpc_task *task, struct nfs_read_data *data)
{
struct nfs_read_data *data = calldata;
struct nfs_readargs *argp = &data->args;
struct nfs_readres *resp = &data->res;
int status = task->tk_status;
int status;
dprintk("NFS: %4d nfs_readpage_result, (status %d)\n",
task->tk_pid, status);
task->tk_pid, task->tk_status);
status = NFS_PROTO(data->inode)->read_done(task, data);
if (status != 0)
return status;
nfs_add_stats(data->inode, NFSIOS_SERVERREADBYTES, resp->count);
@ -474,14 +498,14 @@ void nfs_readpage_result(struct rpc_task *task, void *calldata)
argp->pgbase += resp->count;
argp->count -= resp->count;
rpc_restart_call(task);
return;
return -EAGAIN;
}
task->tk_status = -EIO;
}
spin_lock(&data->inode->i_lock);
NFS_I(data->inode)->cache_validity |= NFS_INO_INVALID_ATIME;
spin_unlock(&data->inode->i_lock);
data->complete(data, status);
return 0;
}
/*

4
include/linux/nfs_fs.h
View File

@ -492,8 +492,8 @@ static inline void nfs_writedata_free(struct nfs_write_data *p)
extern int nfs_readpage(struct file *, struct page *);
extern int nfs_readpages(struct file *, struct address_space *,
struct list_head *, unsigned);
extern void nfs_readpage_result(struct rpc_task *, void *);
extern void nfs_readdata_release(void *data);
extern int nfs_readpage_result(struct rpc_task *, struct nfs_read_data *);
extern void nfs_readdata_release(void *data);
/*

2
include/linux/nfs_xdr.h
View File

@ -695,7 +695,6 @@ struct nfs_read_data {
#ifdef CONFIG_NFS_V4
unsigned long timestamp; /* For lease renewal */
#endif
void (*complete) (struct nfs_read_data *, int);
struct page *page_array[NFS_PAGEVEC_SIZE + 1];
};
@ -768,6 +767,7 @@ struct nfs_rpc_ops {
struct nfs_pathconf *);
u32 * (*decode_dirent)(u32 *, struct nfs_entry *, int plus);
void (*read_setup) (struct nfs_read_data *);
int (*read_done) (struct rpc_task *, struct nfs_read_data *);
void (*write_setup) (struct nfs_write_data *, int how);
int (*write_done) (struct rpc_task *, struct nfs_write_data *);
void (*commit_setup) (struct nfs_write_data *, int how);