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smb3: reenable swapfiles over SMB3 mounts

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With the changes to folios/netfs it is now easier to reenable
swapfile support over SMB3 which fixes various xfstests

Reviewed-by: David Howells <dhowells@redhat.com>
Suggested-by: David Howells <dhowells@redhat.com>
Fixes: e1209d3a7a ("mm: introduce ->swap_rw and use it for reads from SWP_FS_OPS swap-space")
Signed-off-by: Steve French <stfrench@microsoft.com>
This commit is contained in:
Steve French 2024-05-15 18:06:03 -05:00
parent 0450d2083b
commit 16e00683dc
3 changed files with 27 additions and 1 deletions
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3
fs/netfs/direct_write.c
View file

@ -27,7 +27,7 @@ static void netfs_cleanup_dio_write(struct netfs_io_request *wreq)
* Perform an unbuffered write where we may have to do an RMW operation on an
* encrypted file. This can also be used for direct I/O writes.
*/
static ssize_t netfs_unbuffered_write_iter_locked(struct kiocb *iocb, struct iov_iter *iter,
ssize_t netfs_unbuffered_write_iter_locked(struct kiocb *iocb, struct iov_iter *iter,
struct netfs_group *netfs_group)
{
struct netfs_io_request *wreq;
@ -117,6 +117,7 @@ static ssize_t netfs_unbuffered_write_iter_locked(struct kiocb *iocb, struct iov
netfs_put_request(wreq, false, netfs_rreq_trace_put_return);
return ret;
}
EXPORT_SYMBOL(netfs_unbuffered_write_iter_locked);
/**
* netfs_unbuffered_write_iter - Unbuffered write to a file

23
fs/smb/client/file.c
View file

@ -3189,6 +3189,28 @@ static void cifs_swap_deactivate(struct file *file)
/* do we need to unpin (or unlock) the file */
}
/**
* cifs_swap_rw - SMB3 address space operation for swap I/O
* @iocb: target I/O control block
* @iter: I/O buffer
*
* Perform IO to the swap-file. This is much like direct IO.
*/
static int cifs_swap_rw(struct kiocb *iocb, struct iov_iter *iter)
{
ssize_t ret;
WARN_ON_ONCE(iov_iter_count(iter) != PAGE_SIZE);
if (iov_iter_rw(iter) == READ)
ret = netfs_unbuffered_read_iter_locked(iocb, iter);
else
ret = netfs_unbuffered_write_iter_locked(iocb, iter, NULL);
if (ret < 0)
return ret;
return 0;
}
const struct address_space_operations cifs_addr_ops = {
.read_folio = netfs_read_folio,
.readahead = netfs_readahead,
@ -3204,6 +3226,7 @@ const struct address_space_operations cifs_addr_ops = {
*/
.swap_activate = cifs_swap_activate,
.swap_deactivate = cifs_swap_deactivate,
.swap_rw = cifs_swap_rw,
};
/*

2
include/linux/netfs.h
View file

@ -400,6 +400,8 @@ ssize_t netfs_perform_write(struct kiocb *iocb, struct iov_iter *iter,
ssize_t netfs_buffered_write_iter_locked(struct kiocb *iocb, struct iov_iter *from,
struct netfs_group *netfs_group);
ssize_t netfs_unbuffered_write_iter(struct kiocb *iocb, struct iov_iter *from);
ssize_t netfs_unbuffered_write_iter_locked(struct kiocb *iocb, struct iov_iter *iter,
struct netfs_group *netfs_group);
ssize_t netfs_file_write_iter(struct kiocb *iocb, struct iov_iter *from);
/* Address operations API */