From: Long Li <[email protected]> Sometimes upper layer may also want to read data to a page. Implement this API.
Signed-off-by: Long Li <[email protected]> --- fs/cifs/cifsrdma.c | 30 ++++++++++++++++++++++++++++++ fs/cifs/cifsrdma.h | 2 ++ 2 files changed, 32 insertions(+) diff --git a/fs/cifs/cifsrdma.c b/fs/cifs/cifsrdma.c index e5f6300..67a11d9 100644 --- a/fs/cifs/cifsrdma.c +++ b/fs/cifs/cifsrdma.c @@ -1316,6 +1316,36 @@ struct cifs_rdma_info* cifs_create_rdma_session( } /* + * Read a page from receive reassembly queue + * page: the page to read data into + * to_read: the length of data to read + * return value: actual data read + */ +int cifs_rdma_read_page(struct cifs_rdma_info *info, + struct page *page, unsigned int to_read) +{ + int ret; + char *to_address; + + // make sure we have the page ready for read + wait_event( + info->wait_reassembly_queue, + atomic_read(&info->reassembly_data_length) >= to_read || + info->transport_status != CIFS_RDMA_CONNECTED); + + // now we can read from reassembly queue and not sleep + to_address = kmap_atomic(page); + + log_cifs_read("reading from page=%p address=%p to_read=%d\n", + page, to_address, to_read); + + ret = cifs_rdma_read(info, to_address, to_read); + kunmap_atomic(to_address); + + return ret; +} + +/* * Read data from receive reassembly queue * All the incoming data packets are placed in reassembly queue * buf: the buffer to read data into diff --git a/fs/cifs/cifsrdma.h b/fs/cifs/cifsrdma.h index 8891e21..36f3e4c 100644 --- a/fs/cifs/cifsrdma.h +++ b/fs/cifs/cifsrdma.h @@ -215,5 +215,7 @@ struct cifs_rdma_info* cifs_create_rdma_session( // SMBDirect interface for carrying upper layer CIFS I/O int cifs_rdma_read( struct cifs_rdma_info *rdma, char *buf, unsigned int to_read); +int cifs_rdma_read_page( + struct cifs_rdma_info *rdma, struct page *page, unsigned int to_read); int cifs_rdma_write(struct cifs_rdma_info *rdma, struct smb_rqst *rqst); #endif -- 2.7.4
