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target: enhance and export target_alloc_sgl/target_free_sgl

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The SRP target driver will need to allocate and chain it's own SGLs soon.
For this export target_alloc_sgl, and add a new argument to it so that it
can allocate an additional chain entry that doesn't point to a page.  Also
export transport_free_sgl after renaming it to target_free_sgl to free
these SGLs again.

Signed-off-by: Christoph Hellwig <hch@lst.de>
Reviewed-by: Bart Van Assche <bart.vanassche@sandisk.com>
Signed-off-by: Doug Ledford <dledford@redhat.com>
This commit is contained in:
Christoph Hellwig
2016-05-03 18:01:10 +02:00
committed by Doug Ledford
parent a060b5629a
commit e64aa657c3
4 changed files with 23 additions and 16 deletions
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include/target/target_core_backend.h
-1
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@@ -85,7 +85,6 @@ extern struct configfs_attribute *passthrough_attrib_attrs[];
void *transport_kmap_data_sg(struct se_cmd *);
void transport_kunmap_data_sg(struct se_cmd *);
/* core helpers also used by xcopy during internal command setup */
int target_alloc_sgl(struct scatterlist **, unsigned int *, u32, bool);
sense_reason_t transport_generic_map_mem_to_cmd(struct se_cmd *,
struct scatterlist *, u32, struct scatterlist *, u32);
include/target/target_core_fabric.h
+4
View File
@@ -185,6 +185,10 @@ int core_tpg_set_initiator_node_tag(struct se_portal_group *,
int core_tpg_register(struct se_wwn *, struct se_portal_group *, int);
int core_tpg_deregister(struct se_portal_group *);
int target_alloc_sgl(struct scatterlist **sgl, unsigned int *nents,
u32 length, bool zero_page, bool chainable);
void target_free_sgl(struct scatterlist *sgl, int nents);
/*
* The LIO target core uses DMA_TO_DEVICE to mean that data is going
* to the target (eg handling a WRITE) and DMA_FROM_DEVICE to mean