* [PATCH v2 0/2] PCI/VPD: Improve handling binary sysfs attribute
@ 2021-02-03 8:46 Heiner Kallweit
2021-02-03 8:48 ` [PATCH v2 1/2] PCI/VPD: Remove dead code from sysfs access functions Heiner Kallweit
` (2 more replies)
0 siblings, 3 replies; 6+ messages in thread
From: Heiner Kallweit @ 2021-02-03 8:46 UTC (permalink / raw)
To: Bjorn Helgaas; +Cc: linux-pci
Since 104daa71b396 ("PCI: Determine actual VPD size on first access")
there's nothing that keeps us from using a static attribute.
This allows to significantly simplify the code.
v2:
- switch to using PCI sysfs core code in patch 2
Heiner Kallweit (2):
PCI/VPD: Remove dead code from sysfs access functions
PCI/VPD: Let PCI sysfs core code handle VPD binary attribute
drivers/pci/pci-sysfs.c | 54 +++++++++++++++++++++++---------
drivers/pci/pci.h | 2 --
drivers/pci/vpd.c | 68 -----------------------------------------
3 files changed, 40 insertions(+), 84 deletions(-)
--
2.30.0
^ permalink raw reply [flat|nested] 6+ messages in thread
* [PATCH v2 1/2] PCI/VPD: Remove dead code from sysfs access functions
2021-02-03 8:46 [PATCH v2 0/2] PCI/VPD: Improve handling binary sysfs attribute Heiner Kallweit
@ 2021-02-03 8:48 ` Heiner Kallweit
2021-02-03 15:22 ` Krzysztof Wilczyński
2021-02-03 8:50 ` [PATCH v2 2/2] PCI/VPD: Let PCI sysfs core code handle VPD binary attribute Heiner Kallweit
2021-03-30 21:53 ` [PATCH v2 0/2] PCI/VPD: Improve handling binary sysfs attribute Bjorn Helgaas
2 siblings, 1 reply; 6+ messages in thread
From: Heiner Kallweit @ 2021-02-03 8:48 UTC (permalink / raw)
To: Bjorn Helgaas; +Cc: linux-pci
Since 104daa71b396 ("PCI: Determine actual VPD size on first access")
attribute size is set to 0 (unlimited). So let's remove this now
dead code.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
---
v2:
- no changes
---
drivers/pci/vpd.c | 14 --------------
1 file changed, 14 deletions(-)
diff --git a/drivers/pci/vpd.c b/drivers/pci/vpd.c
index 35559ead2..2096530ce 100644
--- a/drivers/pci/vpd.c
+++ b/drivers/pci/vpd.c
@@ -403,13 +403,6 @@ static ssize_t read_vpd_attr(struct file *filp, struct kobject *kobj,
{
struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
- if (bin_attr->size > 0) {
- if (off > bin_attr->size)
- count = 0;
- else if (count > bin_attr->size - off)
- count = bin_attr->size - off;
- }
-
return pci_read_vpd(dev, off, count, buf);
}
@@ -419,13 +412,6 @@ static ssize_t write_vpd_attr(struct file *filp, struct kobject *kobj,
{
struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
- if (bin_attr->size > 0) {
- if (off > bin_attr->size)
- count = 0;
- else if (count > bin_attr->size - off)
- count = bin_attr->size - off;
- }
-
return pci_write_vpd(dev, off, count, buf);
}
--
2.30.0
^ permalink raw reply related [flat|nested] 6+ messages in thread
* [PATCH v2 2/2] PCI/VPD: Let PCI sysfs core code handle VPD binary attribute
2021-02-03 8:46 [PATCH v2 0/2] PCI/VPD: Improve handling binary sysfs attribute Heiner Kallweit
2021-02-03 8:48 ` [PATCH v2 1/2] PCI/VPD: Remove dead code from sysfs access functions Heiner Kallweit
@ 2021-02-03 8:50 ` Heiner Kallweit
2021-02-03 15:24 ` Krzysztof Wilczyński
2021-03-30 21:53 ` [PATCH v2 0/2] PCI/VPD: Improve handling binary sysfs attribute Bjorn Helgaas
2 siblings, 1 reply; 6+ messages in thread
From: Heiner Kallweit @ 2021-02-03 8:50 UTC (permalink / raw)
To: Bjorn Helgaas; +Cc: linux-pci
Since 104daa71b396 ("PCI: Determine actual VPD size on first access")
there's nothing that keeps us from using a static attribute.
This allows to use PCI sysfs core code for handling the attribute.
Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
---
drivers/pci/pci-sysfs.c | 54 ++++++++++++++++++++++++++++++-----------
drivers/pci/pci.h | 2 --
drivers/pci/vpd.c | 54 -----------------------------------------
3 files changed, 40 insertions(+), 70 deletions(-)
diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
index fb072f4b3..ed2ded167 100644
--- a/drivers/pci/pci-sysfs.c
+++ b/drivers/pci/pci-sysfs.c
@@ -255,6 +255,25 @@ static ssize_t ari_enabled_show(struct device *dev,
}
static DEVICE_ATTR_RO(ari_enabled);
+static ssize_t vpd_read(struct file *filp, struct kobject *kobj,
+ struct bin_attribute *bin_attr, char *buf,
+ loff_t off, size_t count)
+{
+ struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
+
+ return pci_read_vpd(dev, off, count, buf);
+}
+
+static ssize_t vpd_write(struct file *filp, struct kobject *kobj,
+ struct bin_attribute *bin_attr, char *buf,
+ loff_t off, size_t count)
+{
+ struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
+
+ return pci_write_vpd(dev, off, count, buf);
+}
+static BIN_ATTR_RW(vpd, 0);
+
static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
char *buf)
{
@@ -621,6 +640,11 @@ static struct attribute *pci_dev_attrs[] = {
NULL,
};
+static struct bin_attribute *pci_dev_bin_attrs[] = {
+ &bin_attr_vpd,
+ NULL,
+};
+
static struct attribute *pci_bridge_attrs[] = {
&dev_attr_subordinate_bus_number.attr,
&dev_attr_secondary_bus_number.attr,
@@ -1323,20 +1347,10 @@ static DEVICE_ATTR(reset, 0200, NULL, reset_store);
static int pci_create_capabilities_sysfs(struct pci_dev *dev)
{
- int retval;
-
- pcie_vpd_create_sysfs_dev_files(dev);
-
- if (dev->reset_fn) {
- retval = device_create_file(&dev->dev, &dev_attr_reset);
- if (retval)
- goto error;
- }
- return 0;
+ if (!dev->reset_fn)
+ return 0;
-error:
- pcie_vpd_remove_sysfs_dev_files(dev);
- return retval;
+ return device_create_file(&dev->dev, &dev_attr_reset);
}
int __must_check pci_create_sysfs_dev_files(struct pci_dev *pdev)
@@ -1409,7 +1423,6 @@ int __must_check pci_create_sysfs_dev_files(struct pci_dev *pdev)
static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
{
- pcie_vpd_remove_sysfs_dev_files(dev);
if (dev->reset_fn) {
device_remove_file(&dev->dev, &dev_attr_reset);
dev->reset_fn = 0;
@@ -1523,8 +1536,21 @@ static umode_t pcie_dev_attrs_are_visible(struct kobject *kobj,
return 0;
}
+static umode_t pci_dev_bin_attrs_visible(struct kobject *kobj,
+ struct bin_attribute *a, int n)
+{
+ struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
+
+ if (a == &bin_attr_vpd && !pdev->vpd)
+ return 0;
+
+ return a->attr.mode;
+}
+
static const struct attribute_group pci_dev_group = {
.attrs = pci_dev_attrs,
+ .bin_attrs = pci_dev_bin_attrs,
+ .is_bin_visible = pci_dev_bin_attrs_visible,
};
const struct attribute_group *pci_dev_groups[] = {
diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
index ef7c46613..d6ad1a3e2 100644
--- a/drivers/pci/pci.h
+++ b/drivers/pci/pci.h
@@ -143,8 +143,6 @@ static inline bool pcie_downstream_port(const struct pci_dev *dev)
int pci_vpd_init(struct pci_dev *dev);
void pci_vpd_release(struct pci_dev *dev);
-void pcie_vpd_create_sysfs_dev_files(struct pci_dev *dev);
-void pcie_vpd_remove_sysfs_dev_files(struct pci_dev *dev);
/* PCI Virtual Channel */
int pci_save_vc_state(struct pci_dev *dev);
diff --git a/drivers/pci/vpd.c b/drivers/pci/vpd.c
index 2096530ce..a33a8fd7e 100644
--- a/drivers/pci/vpd.c
+++ b/drivers/pci/vpd.c
@@ -21,7 +21,6 @@ struct pci_vpd_ops {
struct pci_vpd {
const struct pci_vpd_ops *ops;
- struct bin_attribute *attr; /* Descriptor for sysfs VPD entry */
struct mutex lock;
unsigned int len;
u16 flag;
@@ -397,59 +396,6 @@ void pci_vpd_release(struct pci_dev *dev)
kfree(dev->vpd);
}
-static ssize_t read_vpd_attr(struct file *filp, struct kobject *kobj,
- struct bin_attribute *bin_attr, char *buf,
- loff_t off, size_t count)
-{
- struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
-
- return pci_read_vpd(dev, off, count, buf);
-}
-
-static ssize_t write_vpd_attr(struct file *filp, struct kobject *kobj,
- struct bin_attribute *bin_attr, char *buf,
- loff_t off, size_t count)
-{
- struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
-
- return pci_write_vpd(dev, off, count, buf);
-}
-
-void pcie_vpd_create_sysfs_dev_files(struct pci_dev *dev)
-{
- int retval;
- struct bin_attribute *attr;
-
- if (!dev->vpd)
- return;
-
- attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
- if (!attr)
- return;
-
- sysfs_bin_attr_init(attr);
- attr->size = 0;
- attr->attr.name = "vpd";
- attr->attr.mode = S_IRUSR | S_IWUSR;
- attr->read = read_vpd_attr;
- attr->write = write_vpd_attr;
- retval = sysfs_create_bin_file(&dev->dev.kobj, attr);
- if (retval) {
- kfree(attr);
- return;
- }
-
- dev->vpd->attr = attr;
-}
-
-void pcie_vpd_remove_sysfs_dev_files(struct pci_dev *dev)
-{
- if (dev->vpd && dev->vpd->attr) {
- sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
- kfree(dev->vpd->attr);
- }
-}
-
int pci_vpd_find_tag(const u8 *buf, unsigned int off, unsigned int len, u8 rdt)
{
int i;
--
2.30.0
^ permalink raw reply related [flat|nested] 6+ messages in thread
* Re: [PATCH v2 1/2] PCI/VPD: Remove dead code from sysfs access functions
2021-02-03 8:48 ` [PATCH v2 1/2] PCI/VPD: Remove dead code from sysfs access functions Heiner Kallweit
@ 2021-02-03 15:22 ` Krzysztof Wilczyński
0 siblings, 0 replies; 6+ messages in thread
From: Krzysztof Wilczyński @ 2021-02-03 15:22 UTC (permalink / raw)
To: Heiner Kallweit; +Cc: Bjorn Helgaas, linux-pci
Hi Heiner,
Thank you for cleaning this up!
On 21-02-03 09:48:03, Heiner Kallweit wrote:
> Since 104daa71b396 ("PCI: Determine actual VPD size on first access")
> attribute size is set to 0 (unlimited). So let's remove this now
> dead code.
>
> Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
> ---
> v2:
> - no changes
> ---
> drivers/pci/vpd.c | 14 --------------
> 1 file changed, 14 deletions(-)
>
> diff --git a/drivers/pci/vpd.c b/drivers/pci/vpd.c
> index 35559ead2..2096530ce 100644
> --- a/drivers/pci/vpd.c
> +++ b/drivers/pci/vpd.c
> @@ -403,13 +403,6 @@ static ssize_t read_vpd_attr(struct file *filp, struct kobject *kobj,
> {
> struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
>
> - if (bin_attr->size > 0) {
> - if (off > bin_attr->size)
> - count = 0;
> - else if (count > bin_attr->size - off)
> - count = bin_attr->size - off;
> - }
> -
> return pci_read_vpd(dev, off, count, buf);
> }
>
> @@ -419,13 +412,6 @@ static ssize_t write_vpd_attr(struct file *filp, struct kobject *kobj,
> {
> struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
>
> - if (bin_attr->size > 0) {
> - if (off > bin_attr->size)
> - count = 0;
> - else if (count > bin_attr->size - off)
> - count = bin_attr->size - off;
> - }
> -
> return pci_write_vpd(dev, off, count, buf);
> }
>
> --
> 2.30.0
>
Reviewed-by: Krzysztof Wilczyński <kw@linux.com>
Krzysztof
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH v2 2/2] PCI/VPD: Let PCI sysfs core code handle VPD binary attribute
2021-02-03 8:50 ` [PATCH v2 2/2] PCI/VPD: Let PCI sysfs core code handle VPD binary attribute Heiner Kallweit
@ 2021-02-03 15:24 ` Krzysztof Wilczyński
0 siblings, 0 replies; 6+ messages in thread
From: Krzysztof Wilczyński @ 2021-02-03 15:24 UTC (permalink / raw)
To: Heiner Kallweit; +Cc: Bjorn Helgaas, linux-pci
Hi Heiner,
Thank you for working on this and for cleaning this up!
On 21-02-03 09:50:13, Heiner Kallweit wrote:
> Since 104daa71b396 ("PCI: Determine actual VPD size on first access")
> there's nothing that keeps us from using a static attribute.
> This allows to use PCI sysfs core code for handling the attribute.
>
> Signed-off-by: Heiner Kallweit <hkallweit1@gmail.com>
> ---
> drivers/pci/pci-sysfs.c | 54 ++++++++++++++++++++++++++++++-----------
> drivers/pci/pci.h | 2 --
> drivers/pci/vpd.c | 54 -----------------------------------------
> 3 files changed, 40 insertions(+), 70 deletions(-)
>
> diff --git a/drivers/pci/pci-sysfs.c b/drivers/pci/pci-sysfs.c
> index fb072f4b3..ed2ded167 100644
> --- a/drivers/pci/pci-sysfs.c
> +++ b/drivers/pci/pci-sysfs.c
> @@ -255,6 +255,25 @@ static ssize_t ari_enabled_show(struct device *dev,
> }
> static DEVICE_ATTR_RO(ari_enabled);
>
> +static ssize_t vpd_read(struct file *filp, struct kobject *kobj,
> + struct bin_attribute *bin_attr, char *buf,
> + loff_t off, size_t count)
> +{
> + struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
> +
> + return pci_read_vpd(dev, off, count, buf);
> +}
> +
> +static ssize_t vpd_write(struct file *filp, struct kobject *kobj,
> + struct bin_attribute *bin_attr, char *buf,
> + loff_t off, size_t count)
> +{
> + struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
> +
> + return pci_write_vpd(dev, off, count, buf);
> +}
> +static BIN_ATTR_RW(vpd, 0);
> +
> static ssize_t modalias_show(struct device *dev, struct device_attribute *attr,
> char *buf)
> {
> @@ -621,6 +640,11 @@ static struct attribute *pci_dev_attrs[] = {
> NULL,
> };
>
> +static struct bin_attribute *pci_dev_bin_attrs[] = {
> + &bin_attr_vpd,
> + NULL,
> +};
> +
> static struct attribute *pci_bridge_attrs[] = {
> &dev_attr_subordinate_bus_number.attr,
> &dev_attr_secondary_bus_number.attr,
> @@ -1323,20 +1347,10 @@ static DEVICE_ATTR(reset, 0200, NULL, reset_store);
>
> static int pci_create_capabilities_sysfs(struct pci_dev *dev)
> {
> - int retval;
> -
> - pcie_vpd_create_sysfs_dev_files(dev);
> -
> - if (dev->reset_fn) {
> - retval = device_create_file(&dev->dev, &dev_attr_reset);
> - if (retval)
> - goto error;
> - }
> - return 0;
> + if (!dev->reset_fn)
> + return 0;
>
> -error:
> - pcie_vpd_remove_sysfs_dev_files(dev);
> - return retval;
> + return device_create_file(&dev->dev, &dev_attr_reset);
> }
>
> int __must_check pci_create_sysfs_dev_files(struct pci_dev *pdev)
> @@ -1409,7 +1423,6 @@ int __must_check pci_create_sysfs_dev_files(struct pci_dev *pdev)
>
> static void pci_remove_capabilities_sysfs(struct pci_dev *dev)
> {
> - pcie_vpd_remove_sysfs_dev_files(dev);
> if (dev->reset_fn) {
> device_remove_file(&dev->dev, &dev_attr_reset);
> dev->reset_fn = 0;
> @@ -1523,8 +1536,21 @@ static umode_t pcie_dev_attrs_are_visible(struct kobject *kobj,
> return 0;
> }
>
> +static umode_t pci_dev_bin_attrs_visible(struct kobject *kobj,
> + struct bin_attribute *a, int n)
> +{
> + struct pci_dev *pdev = to_pci_dev(kobj_to_dev(kobj));
> +
> + if (a == &bin_attr_vpd && !pdev->vpd)
> + return 0;
> +
> + return a->attr.mode;
> +}
> +
> static const struct attribute_group pci_dev_group = {
> .attrs = pci_dev_attrs,
> + .bin_attrs = pci_dev_bin_attrs,
> + .is_bin_visible = pci_dev_bin_attrs_visible,
> };
>
> const struct attribute_group *pci_dev_groups[] = {
> diff --git a/drivers/pci/pci.h b/drivers/pci/pci.h
> index ef7c46613..d6ad1a3e2 100644
> --- a/drivers/pci/pci.h
> +++ b/drivers/pci/pci.h
> @@ -143,8 +143,6 @@ static inline bool pcie_downstream_port(const struct pci_dev *dev)
>
> int pci_vpd_init(struct pci_dev *dev);
> void pci_vpd_release(struct pci_dev *dev);
> -void pcie_vpd_create_sysfs_dev_files(struct pci_dev *dev);
> -void pcie_vpd_remove_sysfs_dev_files(struct pci_dev *dev);
>
> /* PCI Virtual Channel */
> int pci_save_vc_state(struct pci_dev *dev);
> diff --git a/drivers/pci/vpd.c b/drivers/pci/vpd.c
> index 2096530ce..a33a8fd7e 100644
> --- a/drivers/pci/vpd.c
> +++ b/drivers/pci/vpd.c
> @@ -21,7 +21,6 @@ struct pci_vpd_ops {
>
> struct pci_vpd {
> const struct pci_vpd_ops *ops;
> - struct bin_attribute *attr; /* Descriptor for sysfs VPD entry */
> struct mutex lock;
> unsigned int len;
> u16 flag;
> @@ -397,59 +396,6 @@ void pci_vpd_release(struct pci_dev *dev)
> kfree(dev->vpd);
> }
>
> -static ssize_t read_vpd_attr(struct file *filp, struct kobject *kobj,
> - struct bin_attribute *bin_attr, char *buf,
> - loff_t off, size_t count)
> -{
> - struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
> -
> - return pci_read_vpd(dev, off, count, buf);
> -}
> -
> -static ssize_t write_vpd_attr(struct file *filp, struct kobject *kobj,
> - struct bin_attribute *bin_attr, char *buf,
> - loff_t off, size_t count)
> -{
> - struct pci_dev *dev = to_pci_dev(kobj_to_dev(kobj));
> -
> - return pci_write_vpd(dev, off, count, buf);
> -}
> -
> -void pcie_vpd_create_sysfs_dev_files(struct pci_dev *dev)
> -{
> - int retval;
> - struct bin_attribute *attr;
> -
> - if (!dev->vpd)
> - return;
> -
> - attr = kzalloc(sizeof(*attr), GFP_ATOMIC);
> - if (!attr)
> - return;
> -
> - sysfs_bin_attr_init(attr);
> - attr->size = 0;
> - attr->attr.name = "vpd";
> - attr->attr.mode = S_IRUSR | S_IWUSR;
> - attr->read = read_vpd_attr;
> - attr->write = write_vpd_attr;
> - retval = sysfs_create_bin_file(&dev->dev.kobj, attr);
> - if (retval) {
> - kfree(attr);
> - return;
> - }
> -
> - dev->vpd->attr = attr;
> -}
> -
> -void pcie_vpd_remove_sysfs_dev_files(struct pci_dev *dev)
> -{
> - if (dev->vpd && dev->vpd->attr) {
> - sysfs_remove_bin_file(&dev->dev.kobj, dev->vpd->attr);
> - kfree(dev->vpd->attr);
> - }
> -}
> -
> int pci_vpd_find_tag(const u8 *buf, unsigned int off, unsigned int len, u8 rdt)
> {
> int i;
> --
> 2.30.0
>
This looks so much better now.
Reviewed-by: Krzysztof Wilczyński <kw@linux.com>
Krzysztof
^ permalink raw reply [flat|nested] 6+ messages in thread
* Re: [PATCH v2 0/2] PCI/VPD: Improve handling binary sysfs attribute
2021-02-03 8:46 [PATCH v2 0/2] PCI/VPD: Improve handling binary sysfs attribute Heiner Kallweit
2021-02-03 8:48 ` [PATCH v2 1/2] PCI/VPD: Remove dead code from sysfs access functions Heiner Kallweit
2021-02-03 8:50 ` [PATCH v2 2/2] PCI/VPD: Let PCI sysfs core code handle VPD binary attribute Heiner Kallweit
@ 2021-03-30 21:53 ` Bjorn Helgaas
2 siblings, 0 replies; 6+ messages in thread
From: Bjorn Helgaas @ 2021-03-30 21:53 UTC (permalink / raw)
To: Heiner Kallweit; +Cc: Bjorn Helgaas, linux-pci, Krzysztof Wilczyński
On Wed, Feb 03, 2021 at 09:46:58AM +0100, Heiner Kallweit wrote:
> Since 104daa71b396 ("PCI: Determine actual VPD size on first access")
> there's nothing that keeps us from using a static attribute.
> This allows to significantly simplify the code.
>
> v2:
> - switch to using PCI sysfs core code in patch 2
>
> Heiner Kallweit (2):
> PCI/VPD: Remove dead code from sysfs access functions
> PCI/VPD: Let PCI sysfs core code handle VPD binary attribute
>
> drivers/pci/pci-sysfs.c | 54 +++++++++++++++++++++++---------
> drivers/pci/pci.h | 2 --
> drivers/pci/vpd.c | 68 -----------------------------------------
> 3 files changed, 40 insertions(+), 84 deletions(-)
Applied to pci/vpd for v5.13, thanks!
^ permalink raw reply [flat|nested] 6+ messages in thread
end of thread, other threads:[~2021-03-30 21:54 UTC | newest]
Thread overview: 6+ messages (download: mbox.gz / follow: Atom feed)
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2021-02-03 8:46 [PATCH v2 0/2] PCI/VPD: Improve handling binary sysfs attribute Heiner Kallweit
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2021-02-03 15:22 ` Krzysztof Wilczyński
2021-02-03 8:50 ` [PATCH v2 2/2] PCI/VPD: Let PCI sysfs core code handle VPD binary attribute Heiner Kallweit
2021-02-03 15:24 ` Krzysztof Wilczyński
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