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cifs: DIO to/from KVEC-type iterators should now work 

DIO to/from KVEC-type iterators should now work as the iterator is passed
down to the socket in non-RDMA/non-crypto mode and in RDMA or crypto mode
care is taken to handle vmap/vmalloc correctly and not take page refs when
building a scatterlist.

Signed-off-by: David Howells <dhowells@redhat.com>
cc: Steve French <sfrench@samba.org>
cc: Shyam Prasad N <nspmangalore@gmail.com>
cc: Rohith Surabattula <rohiths.msft@gmail.com>
cc: Tom Talpey <tom@talpey.com>
cc: Jeff Layton <jlayton@kernel.org>
cc: linux-cifs@vger.kernel.org
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
David Howells 2023-01-16 14:19:29 +00:00 committed by Steve French
parent 607aea3cc2
commit e7388b8a1a
1 changed files with 0 additions and 20 deletions
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20
fs/cifs/file.c
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@ -3549,16 +3549,6 @@ static ssize_t __cifs_writev(
struct cifs_aio_ctx *ctx;
int rc;
/*
* iov_iter_get_pages_alloc doesn't work with ITER_KVEC.
* In this case, fall back to non-direct write function.
* this could be improved by getting pages directly in ITER_KVEC
*/
if (direct && iov_iter_is_kvec(from)) {
cifs_dbg(FYI, "use non-direct cifs_writev for kvec I/O\n");
direct = false;
}
rc = generic_write_checks(iocb, from);
if (rc <= 0)
return rc;
@ -4092,16 +4082,6 @@ static ssize_t __cifs_readv(
loff_t offset = iocb->ki_pos;
struct cifs_aio_ctx *ctx;
/*
* iov_iter_get_pages_alloc() doesn't work with ITER_KVEC,
* fall back to data copy read path
* this could be improved by getting pages directly in ITER_KVEC
*/
if (direct && iov_iter_is_kvec(to)) {
cifs_dbg(FYI, "use non-direct cifs_user_readv for kvec I/O\n");
direct = false;
}
len = iov_iter_count(to);
if (!len)
return 0;