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authorFred Isaman <iisaman@netapp.com>2012-04-20 14:47:46 -0400
committerTrond Myklebust <Trond.Myklebust@netapp.com>2012-04-27 14:10:37 -0400
commit4db6e0b74c0f6dfc2f9c0690e8df512e3b635983 (patch)
tree19d8a2a7051bdab220b0bdcf3da1e350a53ce428 /fs/nfs/pagelist.c
parent30dd374f6fc1b202db3a1b57b61afff1326bad92 (diff)
NFS: merge _full and _partial read rpc_ops
Decouple nfs_pgio_header and nfs_read_data, and have (possibly multiple) nfs_read_datas each take a refcount on nfs_pgio_header. For the moment keeps nfs_read_header as a way to preallocate a single nfs_read_data with the nfs_pgio_header. The code doesn't need this, and would be prettier without, but given the amount of churn I am already introducing I didn't want to play with tuning new mempools. This also fixes bug in pnfs_ld_handle_read_error. In the case of desc->pg_bsize < PAGE_CACHE_SIZE, the pages list was empty, causing replay attempt to do nothing. Signed-off-by: Fred Isaman <iisaman@netapp.com> Signed-off-by: Trond Myklebust <Trond.Myklebust@netapp.com>
Diffstat (limited to 'fs/nfs/pagelist.c')
-rw-r--r--fs/nfs/pagelist.c24
1 files changed, 24 insertions, 0 deletions
diff --git a/fs/nfs/pagelist.c b/fs/nfs/pagelist.c
index d349bd4c48d..cd4c038135a 100644
--- a/fs/nfs/pagelist.c
+++ b/fs/nfs/pagelist.c
@@ -39,6 +39,30 @@ bool nfs_pgarray_set(struct nfs_page_array *p, unsigned int pagecount)
return p->pagevec != NULL;
}
+void nfs_pgheader_init(struct nfs_pageio_descriptor *desc,
+ struct nfs_pgio_header *hdr,
+ void (*release)(struct nfs_pgio_header *hdr))
+{
+ hdr->req = nfs_list_entry(desc->pg_list.next);
+ hdr->inode = desc->pg_inode;
+ hdr->cred = hdr->req->wb_context->cred;
+ hdr->io_start = req_offset(hdr->req);
+ hdr->good_bytes = desc->pg_count;
+ hdr->release = release;
+}
+
+void nfs_set_pgio_error(struct nfs_pgio_header *hdr, int error, loff_t pos)
+{
+ spin_lock(&hdr->lock);
+ if (pos < hdr->io_start + hdr->good_bytes) {
+ set_bit(NFS_IOHDR_ERROR, &hdr->flags);
+ clear_bit(NFS_IOHDR_EOF, &hdr->flags);
+ hdr->good_bytes = pos - hdr->io_start;
+ hdr->error = error;
+ }
+ spin_unlock(&hdr->lock);
+}
+
static inline struct nfs_page *
nfs_page_alloc(void)
{