NFS: Clean up nfs read and write error paths

Move the error handling for nfs_generic_pagein() into a single function.
Ditto for nfs_generic_flush().

Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Cc: Fred Isaman <iisaman@netapp.com>

diff --git a/fs/nfs/pnfs.c b/fs/nfs/pnfs.c
index 39cbac5..6fdeca2 100644 (file)
--- a/fs/nfs/pnfs.c
+++ b/fs/nfs/pnfs.c
@@ -1321,7 +1321,6 @@ pnfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
        if (ret != 0) {
                put_lseg(desc->pg_lseg);
                desc->pg_lseg = NULL;
-               set_bit(NFS_IOHDR_REDO, &hdr->flags);
        } else
                pnfs_do_multiple_writes(desc, &hdr->rpc_list, desc->pg_ioflags);
        if (atomic_dec_and_test(&hdr->refcnt))
@@ -1476,7 +1475,6 @@ pnfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc)
        if (ret != 0) {
                put_lseg(desc->pg_lseg);
                desc->pg_lseg = NULL;
-               set_bit(NFS_IOHDR_REDO, &hdr->flags);
        } else
                pnfs_do_multiple_reads(desc, &hdr->rpc_list);
        if (atomic_dec_and_test(&hdr->refcnt))

diff --git a/fs/nfs/read.c b/fs/nfs/read.c
index 20a0293..1961a19 100644 (file)
--- a/fs/nfs/read.c
+++ b/fs/nfs/read.c
@@ -320,6 +320,19 @@ static const struct nfs_pgio_completion_ops nfs_async_read_completion_ops = {
        .completion = nfs_read_completion,
 };
 
+static void nfs_pagein_error(struct nfs_pageio_descriptor *desc,
+               struct nfs_pgio_header *hdr)
+{
+       set_bit(NFS_IOHDR_REDO, &hdr->flags);
+       while (!list_empty(&hdr->rpc_list)) {
+               struct nfs_read_data *data = list_first_entry(&hdr->rpc_list,
+                               struct nfs_read_data, list);
+               list_del(&data->list);
+               nfs_readdata_release(data);
+       }
+       desc->pg_completion_ops->error_cleanup(&desc->pg_list);
+}
+
 /*
  * Generate multiple requests to fill a single page.
  *
@@ -342,33 +355,27 @@ static int nfs_pagein_multi(struct nfs_pageio_descriptor *desc,
        size_t rsize = desc->pg_bsize, nbytes;
        unsigned int offset;
 
-       nfs_list_remove_request(req);
-       nfs_list_add_request(req, &hdr->pages);
-
        offset = 0;
        nbytes = desc->pg_count;
        do {
                size_t len = min(nbytes,rsize);
 
                data = nfs_readdata_alloc(hdr, 1);
-               if (!data)
-                       goto out_bad;
+               if (!data) {
+                       nfs_pagein_error(desc, hdr);
+                       return -ENOMEM;
+               }
                data->pages.pagevec[0] = page;
                nfs_read_rpcsetup(data, len, offset);
                list_add(&data->list, &hdr->rpc_list);
                nbytes -= len;
                offset += len;
        } while (nbytes != 0);
+
+       nfs_list_remove_request(req);
+       nfs_list_add_request(req, &hdr->pages);
        desc->pg_rpc_callops = &nfs_read_common_ops;
        return 0;
-out_bad:
-       while (!list_empty(&hdr->rpc_list)) {
-               data = list_first_entry(&hdr->rpc_list, struct nfs_read_data, list);
-               list_del(&data->list);
-               nfs_readdata_release(data);
-       }
-       desc->pg_completion_ops->error_cleanup(&hdr->pages);
-       return -ENOMEM;
 }
 
 static int nfs_pagein_one(struct nfs_pageio_descriptor *desc,
@@ -378,12 +385,11 @@ static int nfs_pagein_one(struct nfs_pageio_descriptor *desc,
        struct page             **pages;
        struct nfs_read_data    *data;
        struct list_head *head = &desc->pg_list;
-       int ret = 0;
 
        data = nfs_readdata_alloc(hdr, nfs_page_array_len(desc->pg_base,
                                                          desc->pg_count));
        if (!data) {
-               desc->pg_completion_ops->error_cleanup(head);
+               nfs_pagein_error(desc, hdr);
                return -ENOMEM;
        }
 
@@ -427,8 +433,6 @@ static int nfs_generic_pg_readpages(struct nfs_pageio_descriptor *desc)
        if (ret == 0)
                ret = nfs_do_multiple_reads(&hdr->rpc_list,
                                            desc->pg_rpc_callops);
-       else
-               set_bit(NFS_IOHDR_REDO, &hdr->flags);
        if (atomic_dec_and_test(&hdr->refcnt))
                hdr->completion_ops->completion(hdr);
        return ret;

diff --git a/fs/nfs/write.c b/fs/nfs/write.c
index 2f80aa5..d1e4f81 100644 (file)
--- a/fs/nfs/write.c
+++ b/fs/nfs/write.c
@@ -1058,6 +1058,19 @@ static const struct nfs_pgio_completion_ops nfs_async_write_completion_ops = {
        .completion = nfs_write_completion,
 };
 
+static void nfs_flush_error(struct nfs_pageio_descriptor *desc,
+               struct nfs_pgio_header *hdr)
+{
+       set_bit(NFS_IOHDR_REDO, &hdr->flags);
+       while (!list_empty(&hdr->rpc_list)) {
+               struct nfs_write_data *data = list_first_entry(&hdr->rpc_list,
+                               struct nfs_write_data, list);
+               list_del(&data->list);
+               nfs_writedata_release(data);
+       }
+       desc->pg_completion_ops->error_cleanup(&desc->pg_list);
+}
+
 /*
  * Generate multiple small requests to write out a single
  * contiguous dirty area on one page.
@@ -1071,12 +1084,9 @@ static int nfs_flush_multi(struct nfs_pageio_descriptor *desc,
        size_t wsize = desc->pg_bsize, nbytes;
        unsigned int offset;
        int requests = 0;
-       int ret = 0;
        struct nfs_commit_info cinfo;
 
        nfs_init_cinfo(&cinfo, desc->pg_inode, desc->pg_dreq);
-       nfs_list_remove_request(req);
-       nfs_list_add_request(req, &hdr->pages);
 
        if ((desc->pg_ioflags & FLUSH_COND_STABLE) &&
            (desc->pg_moreio || nfs_reqs_to_commit(&cinfo) ||
@@ -1090,8 +1100,10 @@ static int nfs_flush_multi(struct nfs_pageio_descriptor *desc,
                size_t len = min(nbytes, wsize);
 
                data = nfs_writedata_alloc(hdr, 1);
-               if (!data)
-                       goto out_bad;
+               if (!data) {
+                       nfs_flush_error(desc, hdr);
+                       return -ENOMEM;
+               }
                data->pages.pagevec[0] = page;
                nfs_write_rpcsetup(data, len, offset, desc->pg_ioflags, &cinfo);
                list_add(&data->list, &hdr->rpc_list);
@@ -1099,17 +1111,10 @@ static int nfs_flush_multi(struct nfs_pageio_descriptor *desc,
                nbytes -= len;
                offset += len;
        } while (nbytes != 0);
+       nfs_list_remove_request(req);
+       nfs_list_add_request(req, &hdr->pages);
        desc->pg_rpc_callops = &nfs_write_common_ops;
-       return ret;
-
-out_bad:
-       while (!list_empty(&hdr->rpc_list)) {
-               data = list_first_entry(&hdr->rpc_list, struct nfs_write_data, list);
-               list_del(&data->list);
-               nfs_writedata_release(data);
-       }
-       desc->pg_completion_ops->error_cleanup(&hdr->pages);
-       return -ENOMEM;
+       return 0;
 }
 
 /*
@@ -1127,15 +1132,13 @@ static int nfs_flush_one(struct nfs_pageio_descriptor *desc,
        struct page             **pages;
        struct nfs_write_data   *data;
        struct list_head *head = &desc->pg_list;
-       int ret = 0;
        struct nfs_commit_info cinfo;
 
        data = nfs_writedata_alloc(hdr, nfs_page_array_len(desc->pg_base,
                                                           desc->pg_count));
        if (!data) {
-               desc->pg_completion_ops->error_cleanup(head);
-               ret = -ENOMEM;
-               goto out;
+               nfs_flush_error(desc, hdr);
+               return -ENOMEM;
        }
 
        nfs_init_cinfo(&cinfo, desc->pg_inode, desc->pg_dreq);
@@ -1155,8 +1158,7 @@ static int nfs_flush_one(struct nfs_pageio_descriptor *desc,
        nfs_write_rpcsetup(data, desc->pg_count, 0, desc->pg_ioflags, &cinfo);
        list_add(&data->list, &hdr->rpc_list);
        desc->pg_rpc_callops = &nfs_write_common_ops;
-out:
-       return ret;
+       return 0;
 }
 
 int nfs_generic_flush(struct nfs_pageio_descriptor *desc,
@@ -1186,8 +1188,6 @@ static int nfs_generic_pg_writepages(struct nfs_pageio_descriptor *desc)
                ret = nfs_do_multiple_writes(&hdr->rpc_list,
                                             desc->pg_rpc_callops,
                                             desc->pg_ioflags);
-       else
-               set_bit(NFS_IOHDR_REDO, &hdr->flags);
        if (atomic_dec_and_test(&hdr->refcnt))
                hdr->completion_ops->completion(hdr);
        return ret;