From 788e7a89a03e364855583c0ab4649b94925efbb9 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Mon, 20 Mar 2006 13:44:27 -0500 Subject: NFS: Cleanup of NFS write code in preparation for asynchronous o_direct This patch inverts the callback hierarchy for NFS write calls. Instead of having the NFSv2/v3/v4-specific code set up the RPC callback ops, we allow the original caller to do so. This allows for more flexibility w.r.t. how to set up and tear down the nfs_write_data structure while still allowing the NFSv3/v4 code to perform error handling. The greater flexibility is needed by the asynchronous O_DIRECT code, which wants to be able to hold on to the original nfs_write_data structures after the WRITE RPC call has completed in order to be able to replay them if the COMMIT call determines that the server has rebooted. Signed-off-by: Trond Myklebust --- include/linux/nfs_xdr.h | 3 ++- 1 file changed, 2 insertions(+), 1 deletion(-) (limited to 'include/linux/nfs_xdr.h') diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h index 6d6f69ec5675..277750cc70c0 100644 --- a/include/linux/nfs_xdr.h +++ b/include/linux/nfs_xdr.h @@ -714,7 +714,6 @@ struct nfs_write_data { #ifdef CONFIG_NFS_V4 unsigned long timestamp; /* For lease renewal */ #endif - void (*complete) (struct nfs_write_data *, int); struct page *page_array[NFS_PAGEVEC_SIZE + 1]; }; @@ -770,7 +769,9 @@ struct nfs_rpc_ops { u32 * (*decode_dirent)(u32 *, struct nfs_entry *, int plus); void (*read_setup) (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); + int (*commit_done) (struct rpc_task *, struct nfs_write_data *); int (*file_open) (struct inode *, struct file *); int (*file_release) (struct inode *, struct file *); int (*lock)(struct file *, int, struct file_lock *); -- cgit v1.2.3 From ec06c096edec0755534c7126f4caded69de131c2 Mon Sep 17 00:00:00 2001 From: Trond Myklebust Date: Mon, 20 Mar 2006 13:44:27 -0500 Subject: 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 --- fs/nfs/direct.c | 17 +++++++++++---- fs/nfs/nfs3proc.c | 27 +++++------------------ fs/nfs/nfs4proc.c | 33 ++++++++-------------------- fs/nfs/proc.c | 25 +++++---------------- fs/nfs/read.c | 58 ++++++++++++++++++++++++++++++++++--------------- include/linux/nfs_fs.h | 4 ++-- include/linux/nfs_xdr.h | 2 +- 7 files changed, 77 insertions(+), 89 deletions(-) (limited to 'include/linux/nfs_xdr.h') diff --git a/fs/nfs/direct.c b/fs/nfs/direct.c index fc07ce4885da..3f87a72bd137 100644 --- a/fs/nfs/direct.c +++ b/fs/nfs/direct.c @@ -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); diff --git a/fs/nfs/nfs3proc.c b/fs/nfs/nfs3proc.c index c4f7de8830e9..cf186f0d2b3b 100644 --- a/fs/nfs/nfs3proc.c +++ b/fs/nfs/nfs3proc.c @@ -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, diff --git a/fs/nfs/nfs4proc.c b/fs/nfs/nfs4proc.c index ef4dc315ecc2..bad1eae5608a 100644 --- a/fs/nfs/nfs4proc.c +++ b/fs/nfs/nfs4proc.c @@ -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, diff --git a/fs/nfs/proc.c b/fs/nfs/proc.c index 608aa5932a1d..9dd85cac2df0 100644 --- a/fs/nfs/proc.c +++ b/fs/nfs/proc.c @@ -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, diff --git a/fs/nfs/read.c b/fs/nfs/read.c index ae3ddd24cf8f..2da255f0247f 100644 --- a/fs/nfs/read.c +++ b/fs/nfs/read.c @@ -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; } /* diff --git a/include/linux/nfs_fs.h b/include/linux/nfs_fs.h index 782e59765696..f55827be4f8e 100644 --- a/include/linux/nfs_fs.h +++ b/include/linux/nfs_fs.h @@ -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); /* diff --git a/include/linux/nfs_xdr.h b/include/linux/nfs_xdr.h index 277750cc70c0..7fafc4c546b7 100644 --- a/include/linux/nfs_xdr.h +++ b/include/linux/nfs_xdr.h @@ -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); -- cgit v1.2.3