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Cleanup and clarification of allocation masks handling

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git-svn-id: http://svn.code.sf.net/p/scst/svn/trunk@5166 d57e44dd-8a1f-0410-8b47-8ef2f437770f
This commit is contained in:
Vladislav Bolkhovitin
2013-12-20 03:41:44 +00:00
parent 4b48ce668b
commit 6cfeda64ca
5 changed files with 47 additions and 43 deletions
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scst/include/scst.h
+24 -18
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@@ -1947,14 +1947,6 @@ struct scst_cmd {
/* Set if cmd is queued as hw pending */
unsigned int cmd_hw_pending:1;
/*
* Set, if for this cmd required to not have any IO or FS calls on
* memory buffers allocations, at least for READ and WRITE commands.
* Needed for cases like file systems mounted over scst_local's
* devices.
*/
unsigned noio_mem_alloc:1;
/*
* Set if the target driver wants to alloc data buffers on its own.
* In this case tgt_alloc_data_buf() must be provided in the target
@@ -2039,6 +2031,15 @@ struct scst_cmd {
/* cmd's async flags */
unsigned long cmd_flags;
/*
* GFP mask with which memory on READ or WRITE data path for this cmd
* should be allocated, if the current context is not ATOMIC. Useful
* for cases like if this cmd required to not have any IO or FS calls
* on allocations, like for file systems mounted over scst_local's
* devices.
*/
gfp_t cmd_gfp_mask;
/* Keeps status of cmd's status/data delivery to remote initiator */
int delivery_status;
@@ -2569,8 +2570,16 @@ struct scst_tgt_dev {
struct scst_device *dev; /* to save extra dereferences */
uint64_t lun; /* to save extra dereferences */
gfp_t gfp_mask;
/*
* Extra flags in GFP mask for data buffers allocations of this
* tgt_dev's cmds
*/
gfp_t tgt_dev_gfp_mask;
/* SGV pool from which buffers of this tgt_dev's cmds should be allocated */
struct sgv_pool *pool;
/* Max number of allowed in this tgt_dev SG segments */
int max_sg_cnt;
/*************************************************************
@@ -3545,16 +3554,13 @@ static inline void scst_cmd_set_tgt_sn(struct scst_cmd *cmd, uint32_t tgt_sn)
}
/*
* Get/Set functions for noio_mem_alloc
* Forbids for this cmd any IO-causing allocations.
*
* !! Must be called before scst_cmd_init_done() !!
*/
static inline bool scst_cmd_get_noio_mem_alloc(struct scst_cmd *cmd)
{
return cmd->noio_mem_alloc;
}
static inline void scst_cmd_set_noio_mem_alloc(struct scst_cmd *cmd)
{
cmd->noio_mem_alloc = 1;
cmd->cmd_gfp_mask = GFP_NOIO;
}
/*
@@ -4082,9 +4088,9 @@ int scst_get_buf_full(struct scst_cmd *cmd, uint8_t **buf);
int scst_get_buf_full_sense(struct scst_cmd *cmd, uint8_t **buf);
void scst_put_buf_full(struct scst_cmd *cmd, uint8_t *buf);
static inline gfp_t scst_cmd_get_gfp_flags(struct scst_cmd *cmd)
static inline gfp_t scst_cmd_get_gfp_mask(struct scst_cmd *cmd)
{
return cmd->noio_mem_alloc ? GFP_NOIO : GFP_KERNEL;
return cmd->cmd_gfp_mask;
}
#if LINUX_VERSION_CODE < KERNEL_VERSION(2, 6, 23) && !defined(BACKPORT_LINUX_WORKQUEUE_TO_2_6_19)