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NFS: Fix up NFS I/O subrequest creation 

We require all NFS I/O subrequests to duplicate the lock context as well
as the open context.

Signed-off-by: Trond Myklebust <trond.myklebust@hammerspace.com>
Signed-off-by: Anna Schumaker <Anna.Schumaker@Netapp.com>
This commit is contained in:
Trond Myklebust 2019-04-07 13:59:06 -04:00 committed by Anna Schumaker
parent 6fbda89b25
commit c917cfaf9b
1 changed files with 61 additions and 44 deletions
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105
fs/nfs/pagelist.c
View File

@ -295,6 +295,42 @@ nfs_page_group_destroy(struct kref *kref)
nfs_release_request(head);
}
static struct nfs_page *
__nfs_create_request(struct nfs_lock_context *l_ctx, struct page *page,
struct nfs_page *last, unsigned int pgbase,
unsigned int offset, unsigned int count)
{
struct nfs_page *req;
struct nfs_open_context *ctx = l_ctx->open_context;
if (test_bit(NFS_CONTEXT_BAD, &ctx->flags))
return ERR_PTR(-EBADF);
/* try to allocate the request struct */
req = nfs_page_alloc();
if (req == NULL)
return ERR_PTR(-ENOMEM);
req->wb_lock_context = l_ctx;
refcount_inc(&l_ctx->count);
atomic_inc(&l_ctx->io_count);
/* Initialize the request struct. Initially, we assume a
* long write-back delay. This will be adjusted in
* update_nfs_request below if the region is not locked. */
req->wb_page = page;
if (page) {
req->wb_index = page_index(page);
get_page(page);
}
req->wb_offset = offset;
req->wb_pgbase = pgbase;
req->wb_bytes = count;
req->wb_context = get_nfs_open_context(ctx);
kref_init(&req->wb_kref);
nfs_page_group_init(req, last);
return req;
}
/**
* nfs_create_request - Create an NFS read/write request.
* @ctx: open context to use
@ -312,40 +348,30 @@ nfs_create_request(struct nfs_open_context *ctx, struct page *page,
struct nfs_page *last, unsigned int offset,
unsigned int count)
{
struct nfs_page *req;
struct nfs_lock_context *l_ctx;
struct nfs_lock_context *l_ctx = nfs_get_lock_context(ctx);
struct nfs_page *ret;
if (test_bit(NFS_CONTEXT_BAD, &ctx->flags))
return ERR_PTR(-EBADF);
/* try to allocate the request struct */
req = nfs_page_alloc();
if (req == NULL)
return ERR_PTR(-ENOMEM);
/* get lock context early so we can deal with alloc failures */
l_ctx = nfs_get_lock_context(ctx);
if (IS_ERR(l_ctx)) {
nfs_page_free(req);
if (IS_ERR(l_ctx))
return ERR_CAST(l_ctx);
}
req->wb_lock_context = l_ctx;
atomic_inc(&l_ctx->io_count);
ret = __nfs_create_request(l_ctx, page, last, offset, offset, count);
nfs_put_lock_context(l_ctx);
return ret;
}
/* Initialize the request struct. Initially, we assume a
* long write-back delay. This will be adjusted in
* update_nfs_request below if the region is not locked. */
req->wb_page = page;
if (page) {
req->wb_index = page_index(page);
get_page(page);
static struct nfs_page *
nfs_create_subreq(struct nfs_page *req, struct nfs_page *last,
unsigned int pgbase, unsigned int offset,
unsigned int count)
{
struct nfs_page *ret;
ret = __nfs_create_request(req->wb_lock_context, req->wb_page, last,
pgbase, offset, count);
if (!IS_ERR(ret)) {
nfs_lock_request(ret);
ret->wb_index = req->wb_index;
}
req->wb_offset = offset;
req->wb_pgbase = offset;
req->wb_bytes = count;
req->wb_context = get_nfs_open_context(ctx);
kref_init(&req->wb_kref);
nfs_page_group_init(req, last);
return req;
return ret;
}
/**
@ -1049,14 +1075,10 @@ static int __nfs_pageio_add_request(struct nfs_pageio_descriptor *desc,
pgbase += subreq->wb_bytes;
if (bytes_left) {
subreq = nfs_create_request(req->wb_context,
req->wb_page,
subreq, pgbase, bytes_left);
subreq = nfs_create_subreq(req, subreq, pgbase,
offset, bytes_left);
if (IS_ERR(subreq))
goto err_ptr;
nfs_lock_request(subreq);
subreq->wb_offset = offset;
subreq->wb_index = req->wb_index;
}
} while (bytes_left > 0);
@ -1158,19 +1180,14 @@ int nfs_pageio_add_request(struct nfs_pageio_descriptor *desc,
lastreq = lastreq->wb_this_page)
;
dupreq = nfs_create_request(req->wb_context,
req->wb_page, lastreq, pgbase, bytes);
dupreq = nfs_create_subreq(req, lastreq,
pgbase, offset, bytes);
nfs_page_group_unlock(req);
if (IS_ERR(dupreq)) {
nfs_page_group_unlock(req);
desc->pg_error = PTR_ERR(dupreq);
goto out_failed;
}
nfs_lock_request(dupreq);
nfs_page_group_unlock(req);
dupreq->wb_offset = offset;
dupreq->wb_index = req->wb_index;
} else
dupreq = req;