Add a second xarray struct to netfs_io_request for the purposes of holding a bounce buffer for when we have to deal with encrypted/compressed data or if we have to up/download data in blocks larger than we were asked for. Signed-off-by: David Howells <dhowells@xxxxxxxxxx> cc: Jeff Layton <jlayton@xxxxxxxxxx> cc: linux-cachefs@xxxxxxxxxx cc: linux-fsdevel@xxxxxxxxxxxxxxx cc: linux-mm@xxxxxxxxx --- fs/netfs/io.c | 6 +++++- fs/netfs/objects.c | 3 +++ include/linux/netfs.h | 2 ++ 3 files changed, 10 insertions(+), 1 deletion(-) diff --git a/fs/netfs/io.c b/fs/netfs/io.c index e9d408e211b8..d8e9cd6ce338 100644 --- a/fs/netfs/io.c +++ b/fs/netfs/io.c @@ -643,7 +643,11 @@ int netfs_begin_read(struct netfs_io_request *rreq, bool sync) return -EIO; } - rreq->io_iter = rreq->iter; + if (test_bit(NETFS_RREQ_USE_BOUNCE_BUFFER, &rreq->flags)) + iov_iter_xarray(&rreq->io_iter, ITER_DEST, &rreq->bounce, + rreq->start, rreq->len); + else + rreq->io_iter = rreq->iter; INIT_WORK(&rreq->work, netfs_rreq_work); diff --git a/fs/netfs/objects.c b/fs/netfs/objects.c index 4396318081bf..0782a284dda8 100644 --- a/fs/netfs/objects.c +++ b/fs/netfs/objects.c @@ -35,6 +35,7 @@ struct netfs_io_request *netfs_alloc_request(struct address_space *mapping, rreq->inode = inode; rreq->i_size = i_size_read(inode); rreq->debug_id = atomic_inc_return(&debug_ids); + xa_init(&rreq->bounce); INIT_LIST_HEAD(&rreq->subrequests); refcount_set(&rreq->ref, 1); __set_bit(NETFS_RREQ_IN_PROGRESS, &rreq->flags); @@ -43,6 +44,7 @@ struct netfs_io_request *netfs_alloc_request(struct address_space *mapping, if (rreq->netfs_ops->init_request) { ret = rreq->netfs_ops->init_request(rreq, file); if (ret < 0) { + xa_destroy(&rreq->bounce); kfree(rreq); return ERR_PTR(ret); } @@ -96,6 +98,7 @@ static void netfs_free_request(struct work_struct *work) } kvfree(rreq->direct_bv); } + netfs_clear_buffer(&rreq->bounce); kfree_rcu(rreq, rcu); netfs_stat_d(&netfs_n_rh_rreq); } diff --git a/include/linux/netfs.h b/include/linux/netfs.h index e8d702ac6968..a7220e906287 100644 --- a/include/linux/netfs.h +++ b/include/linux/netfs.h @@ -196,6 +196,7 @@ struct netfs_io_request { struct iov_iter iter; /* Unencrypted-side iterator */ struct iov_iter io_iter; /* I/O (Encrypted-side) iterator */ struct bio_vec *direct_bv; /* DIO buffer list (when handling iovec-iter) */ + struct xarray bounce; /* Bounce buffer (eg. for crypto/compression) */ void *netfs_priv; /* Private data for the netfs */ unsigned int direct_bv_count; /* Number of elements in bv[] */ unsigned int debug_id; @@ -220,6 +221,7 @@ struct netfs_io_request { #define NETFS_RREQ_IN_PROGRESS 5 /* Unlocked when the request completes */ #define NETFS_RREQ_NONBLOCK 6 /* Don't block if possible (O_NONBLOCK) */ #define NETFS_RREQ_BLOCKED 7 /* We blocked */ +#define NETFS_RREQ_USE_BOUNCE_BUFFER 8 /* Use bounce buffer */ const struct netfs_request_ops *netfs_ops; }; -- Linux-cachefs mailing list Linux-cachefs@xxxxxxxxxx https://listman.redhat.com/mailman/listinfo/linux-cachefs