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scsi: target: tcmu: Replace IDR by XArray 

An attempt from Matthew Wilcox to replace IDR usage by XArray in tcmu more
than 1 year ago unfortunately got lost.

I rebased that work on latest tcmu and tested it.

Link: https://lore.kernel.org/r/20210224185335.13844-2-bostroesser@gmail.com
Reviewed-by: Mike Christie <michael.christie@oracle.com>
Signed-off-by: Bodo Stroesser <bostroesser@gmail.com>
Signed-off-by: Martin K. Petersen <martin.petersen@oracle.com>
This commit is contained in:
Bodo Stroesser 2021-02-24 19:53:34 +01:00 committed by Martin K. Petersen
parent 083d248b2d
commit d3cbb743c3
1 changed files with 15 additions and 15 deletions
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30
drivers/target/target_core_user.c
View File

@ -8,12 +8,12 @@
#include <linux/spinlock.h>
#include <linux/module.h>
#include <linux/idr.h>
#include <linux/kernel.h>
#include <linux/timer.h>
#include <linux/parser.h>
#include <linux/vmalloc.h>
#include <linux/uio_driver.h>
#include <linux/xarray.h>
#include <linux/radix-tree.h>
#include <linux/stringify.h>
#include <linux/bitops.h>
@ -147,7 +147,7 @@ struct tcmu_dev {
unsigned long *data_bitmap;
struct radix_tree_root data_blocks;
struct idr commands;
struct xarray commands;
struct timer_list cmd_timer;
unsigned int cmd_time_out;
@ -998,8 +998,8 @@ static int queue_cmd_ring(struct tcmu_cmd *tcmu_cmd, sense_reason_t *scsi_err)
struct tcmu_mailbox *mb = udev->mb_addr;
struct tcmu_cmd_entry *entry;
struct iovec *iov;
int iov_cnt, iov_bidi_cnt, cmd_id;
uint32_t cmd_head;
int iov_cnt, iov_bidi_cnt;
uint32_t cmd_id, cmd_head;
uint64_t cdb_off;
/* size of data buffer needed */
size_t data_length = (size_t)tcmu_cmd->dbi_cnt * DATA_BLOCK_SIZE;
@ -1052,8 +1052,8 @@ static int queue_cmd_ring(struct tcmu_cmd *tcmu_cmd, sense_reason_t *scsi_err)
*/
goto free_and_queue;
cmd_id = idr_alloc(&udev->commands, tcmu_cmd, 1, USHRT_MAX, GFP_NOWAIT);
if (cmd_id < 0) {
if (xa_alloc(&udev->commands, &cmd_id, tcmu_cmd, XA_LIMIT(1, 0xffff),
GFP_NOWAIT) < 0) {
pr_err("tcmu: Could not allocate cmd id.\n");
tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cnt);
@ -1436,7 +1436,7 @@ static unsigned int tcmu_handle_completions(struct tcmu_dev *udev)
}
WARN_ON(tcmu_hdr_get_op(entry->hdr.len_op) != TCMU_OP_CMD);
cmd = idr_remove(&udev->commands, entry->hdr.cmd_id);
cmd = xa_erase(&udev->commands, entry->hdr.cmd_id);
if (!cmd) {
pr_err("cmd_id %u not found, ring is broken\n",
entry->hdr.cmd_id);
@ -1454,7 +1454,7 @@ static unsigned int tcmu_handle_completions(struct tcmu_dev *udev)
free_space = tcmu_run_tmr_queue(udev);
if (atomic_read(&global_db_count) > tcmu_global_max_blocks &&
idr_is_empty(&udev->commands) && list_empty(&udev->qfull_queue)) {
xa_empty(&udev->commands) && list_empty(&udev->qfull_queue)) {
/*
* Allocated blocks exceeded global block limit, currently no
* more pending or waiting commands so try to reclaim blocks.
@ -1577,7 +1577,7 @@ static struct se_device *tcmu_alloc_device(struct se_hba *hba, const char *name)
INIT_LIST_HEAD(&udev->qfull_queue);
INIT_LIST_HEAD(&udev->tmr_queue);
INIT_LIST_HEAD(&udev->inflight_queue);
idr_init(&udev->commands);
xa_init_flags(&udev->commands, XA_FLAGS_ALLOC1);
timer_setup(&udev->qfull_timer, tcmu_qfull_timedout, 0);
timer_setup(&udev->cmd_timer, tcmu_cmd_timedout, 0);
@ -1637,7 +1637,7 @@ static void tcmu_dev_kref_release(struct kref *kref)
struct se_device *dev = &udev->se_dev;
struct tcmu_cmd *cmd;
bool all_expired = true;
int i;
unsigned long i;
vfree(udev->mb_addr);
udev->mb_addr = NULL;
@ -1649,7 +1649,7 @@ static void tcmu_dev_kref_release(struct kref *kref)
/* Upper layer should drain all requests before calling this */
mutex_lock(&udev->cmdr_lock);
idr_for_each_entry(&udev->commands, cmd, i) {
xa_for_each(&udev->commands, i, cmd) {
if (tcmu_check_and_free_pending_cmd(cmd) != 0)
all_expired = false;
}
@ -1657,7 +1657,7 @@ static void tcmu_dev_kref_release(struct kref *kref)
tcmu_remove_all_queued_tmr(udev);
if (!list_empty(&udev->qfull_queue))
all_expired = false;
idr_destroy(&udev->commands);
xa_destroy(&udev->commands);
WARN_ON(!all_expired);
tcmu_blocks_release(&udev->data_blocks, 0, udev->dbi_max + 1);
@ -2247,16 +2247,16 @@ static void tcmu_reset_ring(struct tcmu_dev *udev, u8 err_level)
{
struct tcmu_mailbox *mb;
struct tcmu_cmd *cmd;
int i;
unsigned long i;
mutex_lock(&udev->cmdr_lock);
idr_for_each_entry(&udev->commands, cmd, i) {
xa_for_each(&udev->commands, i, cmd) {
pr_debug("removing cmd %u on dev %s from ring (is expired %d)\n",
cmd->cmd_id, udev->name,
test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags));
idr_remove(&udev->commands, i);
xa_erase(&udev->commands, i);
if (!test_bit(TCMU_CMD_BIT_EXPIRED, &cmd->flags)) {
WARN_ON(!cmd->se_cmd);
list_del_init(&cmd->queue_entry);