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tcmu: fix double se_cmd completion

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If cmd_time_out != 0, then tcmu_queue_cmd_ring could end up
sleeping waiting for ring space, timing out and then returning
failure to lio, and tcmu_check_expired_cmd could also detect
the timeout and call target_complete_cmd on the cmd.

This patch just delays setting up the deadline value and adding
the cmd to the udev->commands idr until we have allocated ring
space and are about to send the cmd to userspace.

Signed-off-by: Mike Christie <mchristi@redhat.com>
Signed-off-by: Nicholas Bellinger <nab@linux-iscsi.org>
This commit is contained in:
Mike Christie 2017-10-25 11:47:15 -05:00 committed by Nicholas Bellinger
parent a271eac46a
commit 0d44374c1a
1 changed files with 31 additions and 23 deletions
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54
drivers/target/target_core_user.c
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@ -432,7 +432,6 @@ static struct tcmu_cmd *tcmu_alloc_cmd(struct se_cmd *se_cmd)
struct se_device *se_dev = se_cmd->se_dev;
struct tcmu_dev *udev = TCMU_DEV(se_dev);
struct tcmu_cmd *tcmu_cmd;
int cmd_id;
tcmu_cmd = kmem_cache_zalloc(tcmu_cmd_cache, GFP_KERNEL);
if (!tcmu_cmd)
@ -440,9 +439,6 @@ static struct tcmu_cmd *tcmu_alloc_cmd(struct se_cmd *se_cmd)
tcmu_cmd->se_cmd = se_cmd;
tcmu_cmd->tcmu_dev = udev;
if (udev->cmd_time_out)
tcmu_cmd->deadline = jiffies +
msecs_to_jiffies(udev->cmd_time_out);
tcmu_cmd_reset_dbi_cur(tcmu_cmd);
tcmu_cmd->dbi_cnt = tcmu_cmd_get_block_cnt(tcmu_cmd);
@ -453,19 +449,6 @@ static struct tcmu_cmd *tcmu_alloc_cmd(struct se_cmd *se_cmd)
return NULL;
}
idr_preload(GFP_KERNEL);
spin_lock_irq(&udev->commands_lock);
cmd_id = idr_alloc(&udev->commands, tcmu_cmd, 0,
USHRT_MAX, GFP_NOWAIT);
spin_unlock_irq(&udev->commands_lock);
idr_preload_end();
if (cmd_id < 0) {
tcmu_free_cmd(tcmu_cmd);
return NULL;
}
tcmu_cmd->cmd_id = cmd_id;
return tcmu_cmd;
}
@ -748,6 +731,30 @@ static inline size_t tcmu_cmd_get_cmd_size(struct tcmu_cmd *tcmu_cmd,
return command_size;
}
static int tcmu_setup_cmd_timer(struct tcmu_cmd *tcmu_cmd)
{
struct tcmu_dev *udev = tcmu_cmd->tcmu_dev;
unsigned long tmo = udev->cmd_time_out;
int cmd_id;
if (tcmu_cmd->cmd_id)
return 0;
cmd_id = idr_alloc(&udev->commands, tcmu_cmd, 1, USHRT_MAX, GFP_NOWAIT);
if (cmd_id < 0) {
pr_err("tcmu: Could not allocate cmd id.\n");
return cmd_id;
}
tcmu_cmd->cmd_id = cmd_id;
if (!tmo)
return 0;
tcmu_cmd->deadline = round_jiffies_up(jiffies + msecs_to_jiffies(tmo));
mod_timer(&udev->timeout, tcmu_cmd->deadline);
return 0;
}
static sense_reason_t
tcmu_queue_cmd_ring(struct tcmu_cmd *tcmu_cmd)
{
@ -841,7 +848,6 @@ tcmu_queue_cmd_ring(struct tcmu_cmd *tcmu_cmd)
entry = (void *) mb + CMDR_OFF + cmd_head;
memset(entry, 0, command_size);
tcmu_hdr_set_op(&entry->hdr.len_op, TCMU_OP_CMD);
entry->hdr.cmd_id = tcmu_cmd->cmd_id;
/* Handle allocating space from the data area */
tcmu_cmd_reset_dbi_cur(tcmu_cmd);
@ -879,6 +885,13 @@ tcmu_queue_cmd_ring(struct tcmu_cmd *tcmu_cmd)
}
entry->req.iov_bidi_cnt = iov_cnt;
ret = tcmu_setup_cmd_timer(tcmu_cmd);
if (ret) {
tcmu_cmd_free_data(tcmu_cmd, tcmu_cmd->dbi_cnt);
return TCM_OUT_OF_RESOURCES;
}
entry->hdr.cmd_id = tcmu_cmd->cmd_id;
/*
* Recalaulate the command's base size and size according
* to the actual needs
@ -912,8 +925,6 @@ tcmu_queue_cmd_ring(struct tcmu_cmd *tcmu_cmd)
static sense_reason_t
tcmu_queue_cmd(struct se_cmd *se_cmd)
{
struct se_device *se_dev = se_cmd->se_dev;
struct tcmu_dev *udev = TCMU_DEV(se_dev);
struct tcmu_cmd *tcmu_cmd;
sense_reason_t ret;
@ -924,9 +935,6 @@ tcmu_queue_cmd(struct se_cmd *se_cmd)
ret = tcmu_queue_cmd_ring(tcmu_cmd);
if (ret != TCM_NO_SENSE) {
pr_err("TCMU: Could not queue command\n");
spin_lock_irq(&udev->commands_lock);
idr_remove(&udev->commands, tcmu_cmd->cmd_id);
spin_unlock_irq(&udev->commands_lock);
tcmu_free_cmd(tcmu_cmd);
}