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Subject[PATCH v2] xen-blkback: define pr_fmt macro to avoid the duplication of DRV_PFX
Date
Define pr_fmt macro with {xen-blkback: } prefix, then remove all use
of DRV_PFX in the pr sentences. Replace all DPRINTK with pr sentences,
and get rid of DPRINTK macro. It will simplify the code.

And if the pr sentences miss a \n, add it in the end. If the DPRINTK
sentences have redundant \n, remove it. It will format the code.

These all make the readability of the code become better.

Signed-off-by: Tao Chen <boby.chen@huawei.com>
---
v2:
- Replace all DPRINTK with pr sentences, and get rid of DPRINTK macro.
---
drivers/block/xen-blkback/blkback.c | 62 ++++++++++++++++++-------------------
drivers/block/xen-blkback/common.h | 6 ----
drivers/block/xen-blkback/xenbus.c | 31 +++++++++++--------
3 files changed, 49 insertions(+), 50 deletions(-)

diff --git a/drivers/block/xen-blkback/blkback.c b/drivers/block/xen-blkback/blkback.c
index 2a04d34..bd2b3bb 100644
--- a/drivers/block/xen-blkback/blkback.c
+++ b/drivers/block/xen-blkback/blkback.c
@@ -34,6 +34,8 @@
* IN THE SOFTWARE.
*/

+#define pr_fmt(fmt) "xen-blkback: " fmt
+
#include <linux/spinlock.h>
#include <linux/kthread.h>
#include <linux/list.h>
@@ -211,7 +213,7 @@ static int add_persistent_gnt(struct xen_blkif *blkif,
else if (persistent_gnt->gnt > this->gnt)
new = &((*new)->rb_right);
else {
- pr_alert_ratelimited(DRV_PFX " trying to add a gref that's already in the tree\n");
+ pr_alert_ratelimited("trying to add a gref that's already in the tree\n");
return -EINVAL;
}
}
@@ -242,7 +244,7 @@ static struct persistent_gnt *get_persistent_gnt(struct xen_blkif *blkif,
node = node->rb_right;
else {
if(test_bit(PERSISTENT_GNT_ACTIVE, data->flags)) {
- pr_alert_ratelimited(DRV_PFX " requesting a grant already in use\n");
+ pr_alert_ratelimited("requesting a grant already in use\n");
return NULL;
}
set_bit(PERSISTENT_GNT_ACTIVE, data->flags);
@@ -257,7 +259,7 @@ static void put_persistent_gnt(struct xen_blkif *blkif,
struct persistent_gnt *persistent_gnt)
{
if(!test_bit(PERSISTENT_GNT_ACTIVE, persistent_gnt->flags))
- pr_alert_ratelimited(DRV_PFX " freeing a grant already unused");
+ pr_alert_ratelimited("freeing a grant already unused\n");
set_bit(PERSISTENT_GNT_WAS_ACTIVE, persistent_gnt->flags);
clear_bit(PERSISTENT_GNT_ACTIVE, persistent_gnt->flags);
atomic_dec(&blkif->persistent_gnt_in_use);
@@ -374,7 +376,7 @@ static void purge_persistent_gnt(struct xen_blkif *blkif)
}

if (work_pending(&blkif->persistent_purge_work)) {
- pr_alert_ratelimited(DRV_PFX "Scheduled work from previous purge is still pending, cannot purge list\n");
+ pr_alert_ratelimited("Scheduled work from previous purge is still pending, cannot purge list\n");
return;
}

@@ -396,7 +398,7 @@ static void purge_persistent_gnt(struct xen_blkif *blkif)

total = num_clean;

- pr_debug(DRV_PFX "Going to purge %u persistent grants\n", num_clean);
+ pr_debug("Going to purge %u persistent grants\n", num_clean);

BUG_ON(!list_empty(&blkif->persistent_purge_list));
root = &blkif->persistent_gnts;
@@ -428,13 +430,13 @@ purge_list:
* with the requested num
*/
if (!scan_used && !clean_used) {
- pr_debug(DRV_PFX "Still missing %u purged frames\n", num_clean);
+ pr_debug("Still missing %u purged frames\n", num_clean);
scan_used = true;
goto purge_list;
}
finished:
if (!clean_used) {
- pr_debug(DRV_PFX "Finished scanning for grants to clean, removing used flag\n");
+ pr_debug("Finished scanning for grants to clean, removing used flag\n");
clean_used = true;
goto purge_list;
}
@@ -444,7 +446,7 @@ finished:

/* We can defer this work */
schedule_work(&blkif->persistent_purge_work);
- pr_debug(DRV_PFX "Purged %u/%u\n", (total - num_clean), total);
+ pr_debug("Purged %u/%u\n", (total - num_clean), total);
return;
}

@@ -520,20 +522,20 @@ static void xen_vbd_resize(struct xen_blkif *blkif)
struct xenbus_device *dev = xen_blkbk_xenbus(blkif->be);
unsigned long long new_size = vbd_sz(vbd);

- pr_info(DRV_PFX "VBD Resize: Domid: %d, Device: (%d, %d)\n",
+ pr_info("VBD Resize: Domid: %d, Device: (%d, %d)\n",
blkif->domid, MAJOR(vbd->pdevice), MINOR(vbd->pdevice));
- pr_info(DRV_PFX "VBD Resize: new size %llu\n", new_size);
+ pr_info("VBD Resize: new size %llu\n", new_size);
vbd->size = new_size;
again:
err = xenbus_transaction_start(&xbt);
if (err) {
- pr_warn(DRV_PFX "Error starting transaction");
+ pr_warn("Error starting transaction\n");
return;
}
err = xenbus_printf(xbt, dev->nodename, "sectors", "%llu",
(unsigned long long)vbd_sz(vbd));
if (err) {
- pr_warn(DRV_PFX "Error writing new size");
+ pr_warn("Error writing new size\n");
goto abort;
}
/*
@@ -543,7 +545,7 @@ again:
*/
err = xenbus_printf(xbt, dev->nodename, "state", "%d", dev->state);
if (err) {
- pr_warn(DRV_PFX "Error writing the state");
+ pr_warn("Error writing the state\n");
goto abort;
}

@@ -551,7 +553,7 @@ again:
if (err == -EAGAIN)
goto again;
if (err)
- pr_warn(DRV_PFX "Error ending transaction");
+ pr_warn("Error ending transaction\n");
return;
abort:
xenbus_transaction_end(xbt, 1);
@@ -578,7 +580,7 @@ irqreturn_t xen_blkif_be_int(int irq, void *dev_id)

static void print_stats(struct xen_blkif *blkif)
{
- pr_info("xen-blkback (%s): oo %3llu | rd %4llu | wr %4llu | f %4llu"
+ pr_info("(%s): oo %3llu | rd %4llu | wr %4llu | f %4llu"
" | ds %4llu | pg: %4u/%4d\n",
current->comm, blkif->st_oo_req,
blkif->st_rd_req, blkif->st_wr_req,
@@ -855,7 +857,7 @@ again:
/* This is a newly mapped grant */
BUG_ON(new_map_idx >= segs_to_map);
if (unlikely(map[new_map_idx].status != 0)) {
- pr_debug(DRV_PFX "invalid buffer -- could not remap it\n");
+ pr_debug("invalid buffer -- could not remap it\n");
put_free_pages(blkif, &pages[seg_idx]->page, 1);
pages[seg_idx]->handle = BLKBACK_INVALID_HANDLE;
ret |= 1;
@@ -891,14 +893,14 @@ again:
goto next;
}
pages[seg_idx]->persistent_gnt = persistent_gnt;
- pr_debug(DRV_PFX " grant %u added to the tree of persistent grants, using %u/%u\n",
+ pr_debug("grant %u added to the tree of persistent grants, using %u/%u\n",
persistent_gnt->gnt, blkif->persistent_gnt_c,
xen_blkif_max_pgrants);
goto next;
}
if (use_persistent_gnts && !blkif->vbd.overflow_max_grants) {
blkif->vbd.overflow_max_grants = 1;
- pr_debug(DRV_PFX " domain %u, device %#x is using maximum number of persistent grants\n",
+ pr_debug("domain %u, device %#x is using maximum number of persistent grants\n",
blkif->domid, blkif->vbd.handle);
}
/*
@@ -916,7 +918,7 @@ next:
return ret;

out_of_memory:
- pr_alert(DRV_PFX "%s: out of memory\n", __func__);
+ pr_alert("%s: out of memory\n", __func__);
put_free_pages(blkif, pages_to_gnt, segs_to_map);
return -ENOMEM;
}
@@ -996,7 +998,7 @@ static int dispatch_discard_io(struct xen_blkif *blkif,

err = xen_vbd_translate(&preq, blkif, WRITE);
if (err) {
- pr_warn(DRV_PFX "access denied: DISCARD [%llu->%llu] on dev=%04x\n",
+ pr_warn("access denied: DISCARD [%llu->%llu] on dev=%04x\n",
preq.sector_number,
preq.sector_number + preq.nr_sects, blkif->vbd.pdevice);
goto fail_response;
@@ -1012,7 +1014,7 @@ static int dispatch_discard_io(struct xen_blkif *blkif,
GFP_KERNEL, secure);
fail_response:
if (err == -EOPNOTSUPP) {
- pr_debug(DRV_PFX "discard op failed, not supported\n");
+ pr_debug("discard op failed, not supported\n");
status = BLKIF_RSP_EOPNOTSUPP;
} else if (err)
status = BLKIF_RSP_ERROR;
@@ -1056,16 +1058,16 @@ static void __end_block_io_op(struct pending_req *pending_req, int error)
/* An error fails the entire request. */
if ((pending_req->operation == BLKIF_OP_FLUSH_DISKCACHE) &&
(error == -EOPNOTSUPP)) {
- pr_debug(DRV_PFX "flush diskcache op failed, not supported\n");
+ pr_debug("flush diskcache op failed, not supported\n");
xen_blkbk_flush_diskcache(XBT_NIL, pending_req->blkif->be, 0);
pending_req->status = BLKIF_RSP_EOPNOTSUPP;
} else if ((pending_req->operation == BLKIF_OP_WRITE_BARRIER) &&
(error == -EOPNOTSUPP)) {
- pr_debug(DRV_PFX "write barrier op failed, not supported\n");
+ pr_debug("write barrier op failed, not supported\n");
xen_blkbk_barrier(XBT_NIL, pending_req->blkif->be, 0);
pending_req->status = BLKIF_RSP_EOPNOTSUPP;
} else if (error) {
- pr_debug(DRV_PFX "Buffer not up-to-date at end of operation,"
+ pr_debug("Buffer not up-to-date at end of operation,"
" error=%d\n", error);
pending_req->status = BLKIF_RSP_ERROR;
}
@@ -1110,7 +1112,7 @@ __do_block_io_op(struct xen_blkif *blkif)

if (RING_REQUEST_PROD_OVERFLOW(&blk_rings->common, rp)) {
rc = blk_rings->common.rsp_prod_pvt;
- pr_warn(DRV_PFX "Frontend provided bogus ring requests (%d - %d = %d). Halting ring processing on dev=%04x\n",
+ pr_warn("Frontend provided bogus ring requests (%d - %d = %d). Halting ring processing on dev=%04x\n",
rp, rc, rp - rc, blkif->vbd.pdevice);
return -EACCES;
}
@@ -1217,8 +1219,7 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
if ((req->operation == BLKIF_OP_INDIRECT) &&
(req_operation != BLKIF_OP_READ) &&
(req_operation != BLKIF_OP_WRITE)) {
- pr_debug(DRV_PFX "Invalid indirect operation (%u)\n",
- req_operation);
+ pr_debug("Invalid indirect operation (%u)\n", req_operation);
goto fail_response;
}

@@ -1252,8 +1253,7 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
(nseg > BLKIF_MAX_SEGMENTS_PER_REQUEST)) ||
unlikely((req->operation == BLKIF_OP_INDIRECT) &&
(nseg > MAX_INDIRECT_SEGMENTS))) {
- pr_debug(DRV_PFX "Bad number of segments in request (%d)\n",
- nseg);
+ pr_debug("Bad number of segments in request (%d)\n", nseg);
/* Haven't submitted any bio's yet. */
goto fail_response;
}
@@ -1288,7 +1288,7 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
}

if (xen_vbd_translate(&preq, blkif, operation) != 0) {
- pr_debug(DRV_PFX "access denied: %s of [%llu,%llu] on dev=%04x\n",
+ pr_debug("access denied: %s of [%llu,%llu] on dev=%04x\n",
operation == READ ? "read" : "write",
preq.sector_number,
preq.sector_number + preq.nr_sects,
@@ -1303,7 +1303,7 @@ static int dispatch_rw_block_io(struct xen_blkif *blkif,
for (i = 0; i < nseg; i++) {
if (((int)preq.sector_number|(int)seg[i].nsec) &
((bdev_logical_block_size(preq.bdev) >> 9) - 1)) {
- pr_debug(DRV_PFX "Misaligned I/O request from domain %d",
+ pr_debug("Misaligned I/O request from domain %d\n",
blkif->domid);
goto fail_response;
}
diff --git a/drivers/block/xen-blkback/common.h b/drivers/block/xen-blkback/common.h
index 375d288..f620b5d 100644
--- a/drivers/block/xen-blkback/common.h
+++ b/drivers/block/xen-blkback/common.h
@@ -44,12 +44,6 @@
#include <xen/interface/io/blkif.h>
#include <xen/interface/io/protocols.h>

-#define DRV_PFX "xen-blkback:"
-#define DPRINTK(fmt, args...) \
- pr_debug(DRV_PFX "(%s:%d) " fmt ".\n", \
- __func__, __LINE__, ##args)
-
-
/*
* This is the maximum number of segments that would be allowed in indirect
* requests. This value will also be passed to the frontend.
diff --git a/drivers/block/xen-blkback/xenbus.c b/drivers/block/xen-blkback/xenbus.c
index b33083e..5448dc8 100644
--- a/drivers/block/xen-blkback/xenbus.c
+++ b/drivers/block/xen-blkback/xenbus.c
@@ -14,6 +14,8 @@

*/

+#define pr_fmt(fmt) "xen-blkback: " fmt
+
#include <stdarg.h>
#include <linux/module.h>
#include <linux/kthread.h>
@@ -426,14 +428,14 @@ static int xen_vbd_create(struct xen_blkif *blkif, blkif_vdev_t handle,
FMODE_READ : FMODE_WRITE, NULL);

if (IS_ERR(bdev)) {
- DPRINTK("xen_vbd_create: device %08x could not be opened.\n",
+ pr_warn("xen_vbd_create: device %08x could not be opened\n",
vbd->pdevice);
return -ENOENT;
}

vbd->bdev = bdev;
if (vbd->bdev->bd_disk == NULL) {
- DPRINTK("xen_vbd_create: device %08x doesn't exist.\n",
+ pr_warn("xen_vbd_create: device %08x doesn't exist\n",
vbd->pdevice);
xen_vbd_free(vbd);
return -ENOENT;
@@ -452,7 +454,7 @@ static int xen_vbd_create(struct xen_blkif *blkif, blkif_vdev_t handle,
if (q && blk_queue_secdiscard(q))
vbd->discard_secure = true;

- DPRINTK("Successful creation of handle=%04x (dom=%u)\n",
+ pr_debug("Successful creation of handle=%04x (dom=%u)\n",
handle, blkif->domid);
return 0;
}
@@ -460,7 +462,7 @@ static int xen_blkbk_remove(struct xenbus_device *dev)
{
struct backend_info *be = dev_get_drvdata(&dev->dev);

- DPRINTK("");
+ pr_debug("%s %p %d\n", __func__, dev, dev->otherend_id);

if (be->major || be->minor)
xenvbd_sysfs_delif(dev);
@@ -566,6 +568,10 @@ static int xen_blkbk_probe(struct xenbus_device *dev,
int err;
struct backend_info *be = kzalloc(sizeof(struct backend_info),
GFP_KERNEL);
+
+ /* match the pr_debug in xen_blkbk_remove */
+ pr_debug("%s %p %d\n", __func__, dev, dev->otherend_id);
+
if (!be) {
xenbus_dev_fatal(dev, -ENOMEM,
"allocating backend structure");
@@ -597,7 +603,7 @@ static int xen_blkbk_probe(struct xenbus_device *dev,
return 0;

fail:
- DPRINTK("failed");
+ pr_warn("%s failed\n", __func__);
xen_blkbk_remove(dev);
return err;
}
@@ -621,7 +627,7 @@ static void backend_changed(struct xenbus_watch *watch,
unsigned long handle;
char *device_type;

- DPRINTK("");
+ pr_debug("%s %p %d\n", __func__, dev, dev->otherend_id);

err = xenbus_scanf(XBT_NIL, dev->nodename, "physical-device", "%x:%x",
&major, &minor);
@@ -640,7 +646,7 @@ static void backend_changed(struct xenbus_watch *watch,

if (be->major | be->minor) {
if (be->major != major || be->minor != minor)
- pr_warn(DRV_PFX "changing physical device (from %x:%x to %x:%x) not supported.\n",
+ pr_warn("changing physical device (from %x:%x to %x:%x) not supported.\n",
be->major, be->minor, major, minor);
return;
}
@@ -701,13 +707,12 @@ static void frontend_changed(struct xenbus_device *dev,
struct backend_info *be = dev_get_drvdata(&dev->dev);
int err;

- DPRINTK("%s", xenbus_strstate(frontend_state));
+ pr_debug("%s %p %s\n", __func__, dev, xenbus_strstate(frontend_state));

switch (frontend_state) {
case XenbusStateInitialising:
if (dev->state == XenbusStateClosed) {
- pr_info(DRV_PFX "%s: prepare for reconnect\n",
- dev->nodename);
+ pr_info("%s: prepare for reconnect\n", dev->nodename);
xenbus_switch_state(dev, XenbusStateInitWait);
}
break;
@@ -774,7 +779,7 @@ static void connect(struct backend_info *be)
int err;
struct xenbus_device *dev = be->dev;

- DPRINTK("%s", dev->otherend);
+ pr_debug("%s %s\n", __func__, dev->otherend);

/* Supply the information about the device the frontend needs */
again:
@@ -860,7 +865,7 @@ static int connect_ring(struct backend_info *be)
char protocol[64] = "";
int err;

- DPRINTK("%s", dev->otherend);
+ pr_debug("%s %s\n", __func__, dev->otherend);

err = xenbus_gather(XBT_NIL, dev->otherend, "ring-ref", "%lu",
&ring_ref, "event-channel", "%u", &evtchn, NULL);
@@ -895,7 +900,7 @@ static int connect_ring(struct backend_info *be)
be->blkif->vbd.feature_gnt_persistent = pers_grants;
be->blkif->vbd.overflow_max_grants = 0;

- pr_info(DRV_PFX "ring-ref %ld, event-channel %d, protocol %d (%s) %s\n",
+ pr_info("ring-ref %ld, event-channel %d, protocol %d (%s) %s\n",
ring_ref, evtchn, be->blkif->blk_protocol, protocol,
pers_grants ? "persistent grants" : "");

--
1.8.5


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