struct nfs_pgio_header *hdr,
void (*release)(struct nfs_pgio_header *hdr))
{
- hdr->req = nfs_list_entry(desc->pg_list.next);
+ struct nfs_pgio_mirror *mirror = &desc->pg_mirrors[desc->pg_mirror_idx];
+
+
+ hdr->req = nfs_list_entry(mirror->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->good_bytes = mirror->pg_count;
hdr->dreq = desc->pg_dreq;
hdr->layout_private = desc->pg_layout_private;
hdr->release = release;
hdr->completion_ops = desc->pg_completion_ops;
if (hdr->completion_ops->init_hdr)
hdr->completion_ops->init_hdr(hdr);
+
+ hdr->pgio_mirror_idx = desc->pg_mirror_idx;
}
EXPORT_SYMBOL_GPL(nfs_pgheader_init);
size_t nfs_generic_pg_test(struct nfs_pageio_descriptor *desc,
struct nfs_page *prev, struct nfs_page *req)
{
- if (desc->pg_count > desc->pg_bsize) {
+ struct nfs_pgio_mirror *mirror = &desc->pg_mirrors[desc->pg_mirror_idx];
+
+
+ if (mirror->pg_count > mirror->pg_bsize) {
/* should never happen */
WARN_ON_ONCE(1);
return 0;
* Limit the request size so that we can still allocate a page array
* for it without upsetting the slab allocator.
*/
- if (((desc->pg_count + req->wb_bytes) >> PAGE_SHIFT) *
+ if (((mirror->pg_count + req->wb_bytes) >> PAGE_SHIFT) *
sizeof(struct page) > PAGE_SIZE)
return 0;
- return min(desc->pg_bsize - desc->pg_count, (size_t)req->wb_bytes);
+ return min(mirror->pg_bsize - mirror->pg_count, (size_t)req->wb_bytes);
}
EXPORT_SYMBOL_GPL(nfs_generic_pg_test);
static int nfs_pgio_error(struct nfs_pageio_descriptor *desc,
struct nfs_pgio_header *hdr)
{
+ struct nfs_pgio_mirror *mirror;
+ u32 midx;
+
set_bit(NFS_IOHDR_REDO, &hdr->flags);
nfs_pgio_data_destroy(hdr);
hdr->completion_ops->completion(hdr);
- desc->pg_completion_ops->error_cleanup(&desc->pg_list);
+ /* TODO: Make sure it's right to clean up all mirrors here
+ * and not just hdr->pgio_mirror_idx */
+ for (midx = 0; midx < desc->pg_mirror_count; midx++) {
+ mirror = &desc->pg_mirrors[midx];
+ desc->pg_completion_ops->error_cleanup(&mirror->pg_list);
+ }
return -ENOMEM;
}
hdr->completion_ops->completion(hdr);
}
+static void nfs_pageio_mirror_init(struct nfs_pgio_mirror *mirror,
+ unsigned int bsize)
+{
+ INIT_LIST_HEAD(&mirror->pg_list);
+ mirror->pg_bytes_written = 0;
+ mirror->pg_count = 0;
+ mirror->pg_bsize = bsize;
+ mirror->pg_base = 0;
+ mirror->pg_recoalesce = 0;
+}
+
/**
* nfs_pageio_init - initialise a page io descriptor
* @desc: pointer to descriptor
size_t bsize,
int io_flags)
{
- INIT_LIST_HEAD(&desc->pg_list);
- desc->pg_bytes_written = 0;
- desc->pg_count = 0;
- desc->pg_bsize = bsize;
- desc->pg_base = 0;
+ struct nfs_pgio_mirror *new;
+ int i;
+
desc->pg_moreio = 0;
- desc->pg_recoalesce = 0;
desc->pg_inode = inode;
desc->pg_ops = pg_ops;
desc->pg_completion_ops = compl_ops;
desc->pg_lseg = NULL;
desc->pg_dreq = NULL;
desc->pg_layout_private = NULL;
+ desc->pg_bsize = bsize;
+
+ desc->pg_mirror_count = 1;
+ desc->pg_mirror_idx = 0;
+
+ if (pg_ops->pg_get_mirror_count) {
+ /* until we have a request, we don't have an lseg and no
+ * idea how many mirrors there will be */
+ new = kcalloc(NFS_PAGEIO_DESCRIPTOR_MIRROR_MAX,
+ sizeof(struct nfs_pgio_mirror), GFP_KERNEL);
+ desc->pg_mirrors_dynamic = new;
+ desc->pg_mirrors = new;
+
+ for (i = 0; i < NFS_PAGEIO_DESCRIPTOR_MIRROR_MAX; i++)
+ nfs_pageio_mirror_init(&desc->pg_mirrors[i], bsize);
+ } else {
+ desc->pg_mirrors_dynamic = NULL;
+ desc->pg_mirrors = desc->pg_mirrors_static;
+ nfs_pageio_mirror_init(&desc->pg_mirrors[0], bsize);
+ }
}
EXPORT_SYMBOL_GPL(nfs_pageio_init);
int nfs_generic_pgio(struct nfs_pageio_descriptor *desc,
struct nfs_pgio_header *hdr)
{
+ struct nfs_pgio_mirror *mirror = &desc->pg_mirrors[desc->pg_mirror_idx];
+
struct nfs_page *req;
struct page **pages,
*last_page;
- struct list_head *head = &desc->pg_list;
+ struct list_head *head = &mirror->pg_list;
struct nfs_commit_info cinfo;
unsigned int pagecount, pageused;
- pagecount = nfs_page_array_len(desc->pg_base, desc->pg_count);
+ pagecount = nfs_page_array_len(mirror->pg_base, mirror->pg_count);
if (!nfs_pgarray_set(&hdr->page_array, pagecount))
return nfs_pgio_error(desc, hdr);
desc->pg_ioflags &= ~FLUSH_COND_STABLE;
/* Set up the argument struct */
- nfs_pgio_rpcsetup(hdr, desc->pg_count, 0, desc->pg_ioflags, &cinfo);
+ nfs_pgio_rpcsetup(hdr, mirror->pg_count, 0, desc->pg_ioflags, &cinfo);
desc->pg_rpc_callops = &nfs_pgio_common_ops;
return 0;
}
static int nfs_generic_pg_pgios(struct nfs_pageio_descriptor *desc)
{
+ struct nfs_pgio_mirror *mirror;
struct nfs_pgio_header *hdr;
int ret;
+ mirror = &desc->pg_mirrors[desc->pg_mirror_idx];
+
hdr = nfs_pgio_header_alloc(desc->pg_rw_ops);
if (!hdr) {
- desc->pg_completion_ops->error_cleanup(&desc->pg_list);
+ /* TODO: make sure this is right with mirroring - or
+ * should it back out all mirrors? */
+ desc->pg_completion_ops->error_cleanup(&mirror->pg_list);
return -ENOMEM;
}
nfs_pgheader_init(desc, hdr, nfs_pgio_header_free);
return ret;
}
+/*
+ * nfs_pageio_setup_mirroring - determine if mirroring is to be used
+ * by calling the pg_get_mirror_count op
+ */
+static int nfs_pageio_setup_mirroring(struct nfs_pageio_descriptor *pgio,
+ struct nfs_page *req)
+{
+ int mirror_count = 1;
+
+ if (!pgio->pg_ops->pg_get_mirror_count)
+ return 0;
+
+ mirror_count = pgio->pg_ops->pg_get_mirror_count(pgio, req);
+
+ if (!mirror_count || mirror_count > NFS_PAGEIO_DESCRIPTOR_MIRROR_MAX)
+ return -EINVAL;
+
+ if (WARN_ON_ONCE(!pgio->pg_mirrors_dynamic))
+ return -EINVAL;
+
+ pgio->pg_mirror_count = mirror_count;
+
+ return 0;
+}
+
+/*
+ * nfs_pageio_stop_mirroring - stop using mirroring (set mirror count to 1)
+ */
+void nfs_pageio_stop_mirroring(struct nfs_pageio_descriptor *pgio)
+{
+ pgio->pg_mirror_count = 1;
+ pgio->pg_mirror_idx = 0;
+}
+
+static void nfs_pageio_cleanup_mirroring(struct nfs_pageio_descriptor *pgio)
+{
+ pgio->pg_mirror_count = 1;
+ pgio->pg_mirror_idx = 0;
+ pgio->pg_mirrors = pgio->pg_mirrors_static;
+ kfree(pgio->pg_mirrors_dynamic);
+ pgio->pg_mirrors_dynamic = NULL;
+}
+
static bool nfs_match_open_context(const struct nfs_open_context *ctx1,
const struct nfs_open_context *ctx2)
{
static int nfs_pageio_do_add_request(struct nfs_pageio_descriptor *desc,
struct nfs_page *req)
{
+ struct nfs_pgio_mirror *mirror = &desc->pg_mirrors[desc->pg_mirror_idx];
+
struct nfs_page *prev = NULL;
- if (desc->pg_count != 0) {
- prev = nfs_list_entry(desc->pg_list.prev);
+
+ if (mirror->pg_count != 0) {
+ prev = nfs_list_entry(mirror->pg_list.prev);
} else {
if (desc->pg_ops->pg_init)
desc->pg_ops->pg_init(desc, req);
- desc->pg_base = req->wb_pgbase;
+ mirror->pg_base = req->wb_pgbase;
}
if (!nfs_can_coalesce_requests(prev, req, desc))
return 0;
nfs_list_remove_request(req);
- nfs_list_add_request(req, &desc->pg_list);
- desc->pg_count += req->wb_bytes;
+ nfs_list_add_request(req, &mirror->pg_list);
+ mirror->pg_count += req->wb_bytes;
return 1;
}
*/
static void nfs_pageio_doio(struct nfs_pageio_descriptor *desc)
{
- if (!list_empty(&desc->pg_list)) {
+ struct nfs_pgio_mirror *mirror = &desc->pg_mirrors[desc->pg_mirror_idx];
+
+
+ if (!list_empty(&mirror->pg_list)) {
int error = desc->pg_ops->pg_doio(desc);
if (error < 0)
desc->pg_error = error;
else
- desc->pg_bytes_written += desc->pg_count;
+ mirror->pg_bytes_written += mirror->pg_count;
}
- if (list_empty(&desc->pg_list)) {
- desc->pg_count = 0;
- desc->pg_base = 0;
+ if (list_empty(&mirror->pg_list)) {
+ mirror->pg_count = 0;
+ mirror->pg_base = 0;
}
}
static int __nfs_pageio_add_request(struct nfs_pageio_descriptor *desc,
struct nfs_page *req)
{
+ struct nfs_pgio_mirror *mirror = &desc->pg_mirrors[desc->pg_mirror_idx];
+
struct nfs_page *subreq;
unsigned int bytes_left = 0;
unsigned int offset, pgbase;
+ WARN_ON_ONCE(desc->pg_mirror_idx >= desc->pg_mirror_count);
+
nfs_page_group_lock(req, false);
subreq = req;
nfs_pageio_doio(desc);
if (desc->pg_error < 0)
return 0;
- if (desc->pg_recoalesce)
+ if (mirror->pg_recoalesce)
return 0;
/* retry add_request for this subreq */
nfs_page_group_lock(req, false);
static int nfs_do_recoalesce(struct nfs_pageio_descriptor *desc)
{
+ struct nfs_pgio_mirror *mirror = &desc->pg_mirrors[desc->pg_mirror_idx];
LIST_HEAD(head);
do {
- list_splice_init(&desc->pg_list, &head);
- desc->pg_bytes_written -= desc->pg_count;
- desc->pg_count = 0;
- desc->pg_base = 0;
- desc->pg_recoalesce = 0;
+ list_splice_init(&mirror->pg_list, &head);
+ mirror->pg_bytes_written -= mirror->pg_count;
+ mirror->pg_count = 0;
+ mirror->pg_base = 0;
+ mirror->pg_recoalesce = 0;
+
desc->pg_moreio = 0;
while (!list_empty(&head)) {
return 0;
break;
}
- } while (desc->pg_recoalesce);
+ } while (mirror->pg_recoalesce);
return 1;
}
-int nfs_pageio_add_request(struct nfs_pageio_descriptor *desc,
+static int nfs_pageio_add_request_mirror(struct nfs_pageio_descriptor *desc,
struct nfs_page *req)
{
int ret;
break;
ret = nfs_do_recoalesce(desc);
} while (ret);
+
return ret;
}
+int nfs_pageio_add_request(struct nfs_pageio_descriptor *desc,
+ struct nfs_page *req)
+{
+ u32 midx;
+ unsigned int pgbase, offset, bytes;
+ struct nfs_page *dupreq, *lastreq;
+
+ pgbase = req->wb_pgbase;
+ offset = req->wb_offset;
+ bytes = req->wb_bytes;
+
+ nfs_pageio_setup_mirroring(desc, req);
+
+ for (midx = 0; midx < desc->pg_mirror_count; midx++) {
+ if (midx) {
+ nfs_page_group_lock(req, false);
+
+ /* find the last request */
+ for (lastreq = req->wb_head;
+ lastreq->wb_this_page != req->wb_head;
+ lastreq = lastreq->wb_this_page)
+ ;
+
+ dupreq = nfs_create_request(req->wb_context,
+ req->wb_page, lastreq, pgbase, bytes);
+
+ if (IS_ERR(dupreq)) {
+ nfs_page_group_unlock(req);
+ return 0;
+ }
+
+ nfs_lock_request(dupreq);
+ nfs_page_group_unlock(req);
+ dupreq->wb_offset = offset;
+ dupreq->wb_index = req->wb_index;
+ } else
+ dupreq = req;
+
+ desc->pg_mirror_idx = midx;
+ if (!nfs_pageio_add_request_mirror(desc, dupreq))
+ return 0;
+ }
+
+ return 1;
+}
+
+/*
+ * nfs_pageio_complete_mirror - Complete I/O on the current mirror of an
+ * nfs_pageio_descriptor
+ * @desc: pointer to io descriptor
+ */
+static void nfs_pageio_complete_mirror(struct nfs_pageio_descriptor *desc,
+ u32 mirror_idx)
+{
+ struct nfs_pgio_mirror *mirror = &desc->pg_mirrors[mirror_idx];
+ u32 restore_idx = desc->pg_mirror_idx;
+
+ desc->pg_mirror_idx = mirror_idx;
+ for (;;) {
+ nfs_pageio_doio(desc);
+ if (!mirror->pg_recoalesce)
+ break;
+ if (!nfs_do_recoalesce(desc))
+ break;
+ }
+ desc->pg_mirror_idx = restore_idx;
+}
+
/*
* nfs_pageio_resend - Transfer requests to new descriptor and resend
* @hdr - the pgio header to move request from
*/
void nfs_pageio_complete(struct nfs_pageio_descriptor *desc)
{
- for (;;) {
- nfs_pageio_doio(desc);
- if (!desc->pg_recoalesce)
- break;
- if (!nfs_do_recoalesce(desc))
- break;
- }
+ u32 midx;
+
+ for (midx = 0; midx < desc->pg_mirror_count; midx++)
+ nfs_pageio_complete_mirror(desc, midx);
if (desc->pg_ops->pg_cleanup)
desc->pg_ops->pg_cleanup(desc);
+ nfs_pageio_cleanup_mirroring(desc);
}
/**
*/
void nfs_pageio_cond_complete(struct nfs_pageio_descriptor *desc, pgoff_t index)
{
- if (!list_empty(&desc->pg_list)) {
- struct nfs_page *prev = nfs_list_entry(desc->pg_list.prev);
- if (index != prev->wb_index + 1)
- nfs_pageio_complete(desc);
+ struct nfs_pgio_mirror *mirror;
+ struct nfs_page *prev;
+ u32 midx;
+
+ for (midx = 0; midx < desc->pg_mirror_count; midx++) {
+ mirror = &desc->pg_mirrors[midx];
+ if (!list_empty(&mirror->pg_list)) {
+ prev = nfs_list_entry(mirror->pg_list.prev);
+ if (index != prev->wb_index + 1)
+ nfs_pageio_complete_mirror(desc, midx);
+ }
}
}
projects / firefly-linux-kernel-4.4.55.git / blobdiff