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Merge branch 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending

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Pull SCSI target patches from Nicholas Bellinger:
 "Here are the remaining target-pending patches for v3.9-rc1.

  The most important one here is the immediate queue starvation
  regression fix for iscsi-target, which addresses a bug that's
  effecting v3.5+ kernels under heavy sustained READ only workloads.
  Thanks alot to Benjamin Estrabaud for helping to track this down!

  Also included is a pSCSI exception bugfix from Asias, along with a
  handful of other minor changes.  Both bugfixes are CC'ed to stable."

* 'for-next' of git://git.kernel.org/pub/scm/linux/kernel/git/nab/target-pending:
  target/pscsi: Rename sg_num to nr_vecs in pscsi_get_bio()
  target/pscsi: Fix page increment
  target/pscsi: Drop unnecessary NULL assignment to bio->bi_next
  target: Add __exit annotation for module_exit functions
  iscsi-target: Fix immediate queue starvation regression with DATAIN
This commit is contained in:
Linus Torvalds 2013-03-02 11:43:27 -08:00
commit 986248993d
5 changed files with 15 additions and 11 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

11
drivers/target/iscsi/iscsi_target.c
View File

@ -3584,6 +3584,10 @@ static int handle_response_queue(struct iscsi_conn *conn)
spin_lock_bh(&cmd->istate_lock);
cmd->i_state = ISTATE_SENT_STATUS;
spin_unlock_bh(&cmd->istate_lock);
if (atomic_read(&conn->check_immediate_queue))
return 1;
continue;
} else if (ret == 2) {
/* Still must send status,
@ -3673,7 +3677,7 @@ static int handle_response_queue(struct iscsi_conn *conn)
}
if (atomic_read(&conn->check_immediate_queue))
break;
return 1;
}
return 0;
@ -3717,12 +3721,15 @@ int iscsi_target_tx_thread(void *arg)
signal_pending(current))
goto transport_err;
get_immediate:
ret = handle_immediate_queue(conn);
if (ret < 0)
goto transport_err;
ret = handle_response_queue(conn);
if (ret == -EAGAIN)
if (ret == 1)
goto get_immediate;
else if (ret == -EAGAIN)
goto restart;
else if (ret < 0)
goto transport_err;

2
drivers/target/sbp/sbp_target.c
View File

@ -2598,7 +2598,7 @@ static int __init sbp_init(void)
return 0;
};
static void sbp_exit(void)
static void __exit sbp_exit(void)
{
sbp_deregister_configfs();
};

2
drivers/target/target_core_file.c
View File

@ -631,7 +631,7 @@ static int __init fileio_module_init(void)
return transport_subsystem_register(&fileio_template);
}
static void fileio_module_exit(void)
static void __exit fileio_module_exit(void)
{
transport_subsystem_release(&fileio_template);
}

2
drivers/target/target_core_iblock.c
View File

@ -821,7 +821,7 @@ static int __init iblock_module_init(void)
return transport_subsystem_register(&iblock_template);
}
static void iblock_module_exit(void)
static void __exit iblock_module_exit(void)
{
transport_subsystem_release(&iblock_template);
}

9
drivers/target/target_core_pscsi.c
View File

@ -840,14 +840,14 @@ static void pscsi_bi_endio(struct bio *bio, int error)
bio_put(bio);
}
static inline struct bio *pscsi_get_bio(int sg_num)
static inline struct bio *pscsi_get_bio(int nr_vecs)
{
struct bio *bio;
/*
* Use bio_malloc() following the comment in for bio -> struct request
* in block/blk-core.c:blk_make_request()
*/
bio = bio_kmalloc(GFP_KERNEL, sg_num);
bio = bio_kmalloc(GFP_KERNEL, nr_vecs);
if (!bio) {
pr_err("PSCSI: bio_kmalloc() failed\n");
return NULL;
@ -940,7 +940,6 @@ pscsi_map_sg(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
bio = NULL;
}
page++;
len -= bytes;
data_len -= bytes;
off = 0;
@ -952,7 +951,6 @@ pscsi_map_sg(struct se_cmd *cmd, struct scatterlist *sgl, u32 sgl_nents,
while (*hbio) {
bio = *hbio;
*hbio = (*hbio)->bi_next;
bio->bi_next = NULL;
bio_endio(bio, 0); /* XXX: should be error */
}
return TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
@ -1092,7 +1090,6 @@ pscsi_execute_cmd(struct se_cmd *cmd)
while (hbio) {
struct bio *bio = hbio;
hbio = hbio->bi_next;
bio->bi_next = NULL;
bio_endio(bio, 0); /* XXX: should be error */
}
ret = TCM_LOGICAL_UNIT_COMMUNICATION_FAILURE;
@ -1178,7 +1175,7 @@ static int __init pscsi_module_init(void)
return transport_subsystem_register(&pscsi_template);
}
static void pscsi_module_exit(void)
static void __exit pscsi_module_exit(void)
{
transport_subsystem_release(&pscsi_template);
}