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netfs: Use mempools for allocating requests and subrequests

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Use mempools for allocating requests and subrequests in an effort to make
sure that allocation always succeeds so that when performing writeback we
can always make progress.

Signed-off-by: David Howells <dhowells@redhat.com>
Reviewed-by: Jeff Layton <jlayton@kernel.org>
cc: netfs@lists.linux.dev
cc: linux-fsdevel@vger.kernel.org
cc: linux-mm@kvack.org
This commit is contained in:
David Howells
2024-03-15 14:37:18 +00:00
parent b4ff7b178b
commit d9f85a04fb
4 changed files with 88 additions and 27 deletions
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5
include/linux/netfs.h
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@@ -20,6 +20,7 @@
#include <linux/uio.h>
enum netfs_sreq_ref_trace;
typedef struct mempool_s mempool_t;
/**
* folio_start_private_2 - Start an fscache write on a folio. [DEPRECATED]
@@ -236,8 +237,8 @@ struct netfs_io_request {
* Operations the network filesystem can/must provide to the helpers.
*/
struct netfs_request_ops {
unsigned int io_request_size; /* Alloc size for netfs_io_request struct */
unsigned int io_subrequest_size; /* Alloc size for netfs_io_subrequest struct */
mempool_t *request_pool;
mempool_t *subrequest_pool;
int (*init_request)(struct netfs_io_request *rreq, struct file *file);
void (*free_request)(struct netfs_io_request *rreq);
void (*free_subrequest)(struct netfs_io_subrequest *rreq);