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[SCSI] libiscsi, iscsi_tcp: iscsi pool cleanup 

iscsi_pool_init simplified

iscsi_pool_init currently has a lot of duplicate kfree() calls it does
when some allocation fails. This patch simplifies the code a little by
using iscsi_pool_free to tear down the pool in case of an error.

iscsi_pool_init also returns a copy of the item array to the caller.
Not all callers use this array, so we make it optional.

Instead of allocating a second array and return that, allocate just one
array, of twice the size.

Update users of iscsi_pool_{init,free}

This patch drops the (now useless) second argument to
iscsi_pool_free, and updates all callers.

It also removes the ctask->r2ts array, which was never
used anyway. Since the items argument to iscsi_pool_init
is now optional, we can pass NULL instead.

Signed-off-by: Olaf Kirch <olaf.kirch@oracle.com>
Signed-off-by: Mike Christie <michaelc@cs.wisc.edu>
Signed-off-by: James Bottomley <James.Bottomley@HansenPartnership.com>
This commit is contained in:
Olaf Kirch 2007-12-13 12:43:25 -06:00 committed by James Bottomley
parent 38ad03de3f
commit 6320377fd9
4 changed files with 50 additions and 50 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

12
drivers/scsi/iscsi_tcp.c
View File

@ -1998,8 +1998,7 @@ iscsi_r2tpool_alloc(struct iscsi_session *session)
*/
/* R2T pool */
if (iscsi_pool_init(&tcp_ctask->r2tpool, session->max_r2t * 4,
(void***)&tcp_ctask->r2ts,
if (iscsi_pool_init(&tcp_ctask->r2tpool, session->max_r2t * 4, NULL,
sizeof(struct iscsi_r2t_info))) {
goto r2t_alloc_fail;
}
@ -2008,8 +2007,7 @@ iscsi_r2tpool_alloc(struct iscsi_session *session)
tcp_ctask->r2tqueue = kfifo_alloc(
session->max_r2t * 4 * sizeof(void*), GFP_KERNEL, NULL);
if (tcp_ctask->r2tqueue == ERR_PTR(-ENOMEM)) {
iscsi_pool_free(&tcp_ctask->r2tpool,
(void**)tcp_ctask->r2ts);
iscsi_pool_free(&tcp_ctask->r2tpool);
goto r2t_alloc_fail;
}
}
@ -2022,8 +2020,7 @@ iscsi_r2tpool_alloc(struct iscsi_session *session)
struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
kfifo_free(tcp_ctask->r2tqueue);
iscsi_pool_free(&tcp_ctask->r2tpool,
(void**)tcp_ctask->r2ts);
iscsi_pool_free(&tcp_ctask->r2tpool);
}
return -ENOMEM;
}
@ -2038,8 +2035,7 @@ iscsi_r2tpool_free(struct iscsi_session *session)
struct iscsi_tcp_cmd_task *tcp_ctask = ctask->dd_data;
kfifo_free(tcp_ctask->r2tqueue);
iscsi_pool_free(&tcp_ctask->r2tpool,
(void**)tcp_ctask->r2ts);
iscsi_pool_free(&tcp_ctask->r2tpool);
}
}

3
drivers/scsi/iscsi_tcp.h
View File

@ -175,9 +175,8 @@ struct iscsi_tcp_cmd_task {
uint32_t exp_datasn; /* expected target's R2TSN/DataSN */
int data_offset;
struct iscsi_r2t_info *r2t; /* in progress R2T */
struct iscsi_queue r2tpool;
struct iscsi_pool r2tpool;
struct kfifo *r2tqueue;
struct iscsi_r2t_info **r2ts;
int digest_count;
uint32_t immdigest; /* for imm data */
struct iscsi_buf immbuf; /* for imm data digest */

75
drivers/scsi/libiscsi.c
View File

@ -1413,59 +1413,64 @@ int iscsi_eh_device_reset(struct scsi_cmnd *sc)
}
EXPORT_SYMBOL_GPL(iscsi_eh_device_reset);
/*
* Pre-allocate a pool of @max items of @item_size. By default, the pool
* should be accessed via kfifo_{get,put} on q->queue.
* Optionally, the caller can obtain the array of object pointers
* by passing in a non-NULL @items pointer
*/
int
iscsi_pool_init(struct iscsi_queue *q, int max, void ***items, int item_size)
iscsi_pool_init(struct iscsi_pool *q, int max, void ***items, int item_size)
{
int i;
int i, num_arrays = 1;
*items = kmalloc(max * sizeof(void*), GFP_KERNEL);
if (*items == NULL)
return -ENOMEM;
memset(q, 0, sizeof(*q));
q->max = max;
q->pool = kmalloc(max * sizeof(void*), GFP_KERNEL);
if (q->pool == NULL) {
kfree(*items);
return -ENOMEM;
}
/* If the user passed an items pointer, he wants a copy of
* the array. */
if (items)
num_arrays++;
q->pool = kzalloc(num_arrays * max * sizeof(void*), GFP_KERNEL);
if (q->pool == NULL)
goto enomem;
q->queue = kfifo_init((void*)q->pool, max * sizeof(void*),
GFP_KERNEL, NULL);
if (q->queue == ERR_PTR(-ENOMEM)) {
kfree(q->pool);
kfree(*items);
return -ENOMEM;
}
if (q->queue == ERR_PTR(-ENOMEM))
goto enomem;
for (i = 0; i < max; i++) {
q->pool[i] = kmalloc(item_size, GFP_KERNEL);
q->pool[i] = kzalloc(item_size, GFP_KERNEL);
if (q->pool[i] == NULL) {
int j;
for (j = 0; j < i; j++)
kfree(q->pool[j]);
kfifo_free(q->queue);
kfree(q->pool);
kfree(*items);
return -ENOMEM;
q->max = i;
goto enomem;
}
memset(q->pool[i], 0, item_size);
(*items)[i] = q->pool[i];
__kfifo_put(q->queue, (void*)&q->pool[i], sizeof(void*));
}
if (items) {
*items = q->pool + max;
memcpy(*items, q->pool, max * sizeof(void *));
}
return 0;
enomem:
iscsi_pool_free(q);
return -ENOMEM;
}
EXPORT_SYMBOL_GPL(iscsi_pool_init);
void iscsi_pool_free(struct iscsi_queue *q, void **items)
void iscsi_pool_free(struct iscsi_pool *q)
{
int i;
for (i = 0; i < q->max; i++)
kfree(items[i]);
kfree(q->pool);
kfree(items);
kfree(q->pool[i]);
if (q->pool)
kfree(q->pool);
}
EXPORT_SYMBOL_GPL(iscsi_pool_free);
@ -1610,9 +1615,9 @@ iscsi_session_setup(struct iscsi_transport *iscsit,
cls_session_fail:
scsi_remove_host(shost);
add_host_fail:
iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
iscsi_pool_free(&session->mgmtpool);
mgmtpool_alloc_fail:
iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
iscsi_pool_free(&session->cmdpool);
cmdpool_alloc_fail:
scsi_host_put(shost);
return NULL;
@ -1635,8 +1640,8 @@ void iscsi_session_teardown(struct iscsi_cls_session *cls_session)
iscsi_unblock_session(cls_session);
scsi_remove_host(shost);
iscsi_pool_free(&session->mgmtpool, (void**)session->mgmt_cmds);
iscsi_pool_free(&session->cmdpool, (void**)session->cmds);
iscsi_pool_free(&session->mgmtpool);
iscsi_pool_free(&session->cmdpool);
kfree(session->password);
kfree(session->password_in);

10
include/scsi/libiscsi.h
View File

@ -215,7 +215,7 @@ struct iscsi_conn {
uint32_t eh_abort_cnt;
};
struct iscsi_queue {
struct iscsi_pool {
struct kfifo *queue; /* FIFO Queue */
void **pool; /* Pool of elements */
int max; /* Max number of elements */
@ -274,10 +274,10 @@ struct iscsi_session {
int cmds_max; /* size of cmds array */
struct iscsi_cmd_task **cmds; /* Original Cmds arr */
struct iscsi_queue cmdpool; /* PDU's pool */
struct iscsi_pool cmdpool; /* PDU's pool */
int mgmtpool_max; /* size of mgmt array */
struct iscsi_mgmt_task **mgmt_cmds; /* Original mgmt arr */
struct iscsi_queue mgmtpool; /* Mgmt PDU's pool */
struct iscsi_pool mgmtpool; /* Mgmt PDU's pool */
};
/*
@ -350,8 +350,8 @@ extern void iscsi_requeue_ctask(struct iscsi_cmd_task *ctask);
/*
* generic helpers
*/
extern void iscsi_pool_free(struct iscsi_queue *, void **);
extern int iscsi_pool_init(struct iscsi_queue *, int, void ***, int);
extern void iscsi_pool_free(struct iscsi_pool *);
extern int iscsi_pool_init(struct iscsi_pool *, int, void ***, int);
/*
* inline functions to deal with padding.