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NFS: Clean up nfs read and write error paths

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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>
This commit is contained in:
Trond Myklebust
2012-05-01 12:07:22 -04:00
parent 9146ab5055
commit 25b11dcdbf
3 changed files with 44 additions and 42 deletions
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46
fs/nfs/write.c
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@@ -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;