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L4Re Operating System Framework
Interface and Usage Documentation
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A request to read or write data. More...
#include <virtio-block>
Collaboration diagram for L4virtio::Svr::Block_request< Ds_data >:Public Member Functions | |
| unsigned | data_size () const |
| Compute the total size of the data in the request. | |
| bool | has_more () |
| Check if the request contains more data blocks. | |
| Data_block | next_block () |
| Return next block in scatter-gather list. | |
| l4virtio_block_header_t const & | header () const |
| Return the block request header. | |
A request to read or write data.
Definition at line 28 of file virtio-block.
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inline |
Compute the total size of the data in the request.
| Size | in bytes or 0 if there was an error. |
| L4::Runtime_error(-L4_EIO) | Request has a bad format. |
Note that this operation is relatively expensive as it has to iterate over the complete list of blocks.
Definition at line 63 of file virtio-block.
References L4virtio::Svr::Request_processor::has_more(), L4_EIO, L4virtio::Svr::Request_processor::next(), and L4virtio::Svr::Request_processor::start().
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inline |
Return next block in scatter-gather list.
| L4::Runtime_error | No more data block is available. |
| Bad_descriptor | Virtio request is corrupted. |
Definition at line 113 of file virtio-block.
References L4virtio::Svr::Bad_descriptor::Bad_size, L4virtio::Svr::Request_processor::has_more(), L4_EEXIST, and L4virtio::Svr::Request_processor::next().
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