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Date: Fri, 16 Oct 2020 15:20:45 +0200
From: Christoph Hellwig <hch@....de>
To: Kees Cook <keescook@...omium.org>,
Anton Vorontsov <anton@...msg.org>,
Colin Cross <ccross@...roid.com>,
Tony Luck <tony.luck@...el.com>,
WeiXiong Liao <liaoweixiong@...winnertech.com>
Cc: linux-mtd@...ts.infradead.org, linux-kernel@...r.kernel.org
Subject: [PATCH 7/9] pstore/blk: remove struct pstore_device_info
The total_size and flags are only needed at registrations time, so just
pass them to register_pstore_device directly.
Signed-off-by: Christoph Hellwig <hch@....de>
---
drivers/mtd/mtdpstore.c | 10 ++--
fs/pstore/blk.c | 98 ++++++++++++++++----------------------
include/linux/pstore_blk.h | 21 ++------
3 files changed, 47 insertions(+), 82 deletions(-)
diff --git a/drivers/mtd/mtdpstore.c b/drivers/mtd/mtdpstore.c
index 232ba5c39c2a55..88d0305ca27336 100644
--- a/drivers/mtd/mtdpstore.c
+++ b/drivers/mtd/mtdpstore.c
@@ -12,7 +12,6 @@
static struct mtdpstore_context {
int index;
struct pstore_blk_config info;
- struct pstore_device_info dev;
struct mtd_info *mtd;
unsigned long *rmmap; /* removed bit map */
unsigned long *usedmap; /* used bit map */
@@ -431,12 +430,9 @@ static void mtdpstore_notify_add(struct mtd_info *mtd)
longcnt = BITS_TO_LONGS(div_u64(mtd->size, mtd->erasesize));
cxt->badmap = kcalloc(longcnt, sizeof(long), GFP_KERNEL);
- cxt->dev.total_size = mtd->size;
/* just support dmesg right now */
- cxt->dev.flags = PSTORE_FLAGS_DMESG;
- cxt->dev.ops = &mtdpstore_ops;
-
- ret = register_pstore_device(&cxt->dev);
+ ret = register_pstore_device(&mtdpstore_ops, mtd->size,
+ PSTORE_FLAGS_DMESG);
if (ret) {
dev_err(&mtd->dev, "mtd%d register to psblk failed\n",
mtd->index);
@@ -531,7 +527,7 @@ static void mtdpstore_notify_remove(struct mtd_info *mtd)
mtdpstore_flush_removed(cxt);
- unregister_pstore_device(&cxt->dev);
+ unregister_pstore_device(&mtdpstore_ops);
kfree(cxt->badmap);
kfree(cxt->usedmap);
kfree(cxt->rmmap);
diff --git a/fs/pstore/blk.c b/fs/pstore/blk.c
index f7c7f325e42c71..0430b190a1df2a 100644
--- a/fs/pstore/blk.c
+++ b/fs/pstore/blk.c
@@ -102,27 +102,40 @@ static struct pstore_zone_info *pstore_zone_info;
_##name_; \
})
-static int __register_pstore_device(struct pstore_device_info *dev)
+/**
+ * register_pstore_device() - register device to pstore/blk
+ *
+ * @ops: operations to access the device.
+ * @total_size: The total size in bytes pstore/blk can use. It must be greater
+ * than 4096 and be multiple of 4096.
+ * @flags: Refer to macro starting with PSTORE_FLAGS defined in
+ * linux/pstore.h. It means what front-ends this device support.
+ * Zero means all backends for compatible.
+ */
+int register_pstore_device(const struct pstore_zone_ops *ops,
+ unsigned long total_size, unsigned int flags)
{
int ret;
- lockdep_assert_held(&pstore_blk_lock);
-
- if (!dev || !dev->total_size || !dev->ops ||
- !dev->ops->read || !dev->ops->write)
+ if (!ops || !ops->read || !ops->write || !total_size)
return -EINVAL;
/* someone already registered before */
- if (pstore_zone_info)
- return -EBUSY;
+ mutex_lock(&pstore_blk_lock);
+ if (pstore_zone_info) {
+ ret = -EBUSY;
+ goto out_unlock;
+ }
pstore_zone_info = kzalloc(sizeof(struct pstore_zone_info), GFP_KERNEL);
- if (!pstore_zone_info)
- return -ENOMEM;
+ if (!pstore_zone_info) {
+ ret = -ENOMEM;
+ goto out_unlock;
+ }
/* zero means not limit on which backends to attempt to store. */
- if (!dev->flags)
- dev->flags = UINT_MAX;
+ if (!flags)
+ flags = UINT_MAX;
#define verify_size(name, alignsize, enabled) { \
long _##name_; \
@@ -134,63 +147,40 @@ static int __register_pstore_device(struct pstore_device_info *dev)
pstore_zone_info->name = _##name_; \
}
- verify_size(kmsg_size, 4096, dev->flags & PSTORE_FLAGS_DMESG);
- verify_size(pmsg_size, 4096, dev->flags & PSTORE_FLAGS_PMSG);
- verify_size(console_size, 4096, dev->flags & PSTORE_FLAGS_CONSOLE);
- verify_size(ftrace_size, 4096, dev->flags & PSTORE_FLAGS_FTRACE);
+ verify_size(kmsg_size, 4096, flags & PSTORE_FLAGS_DMESG);
+ verify_size(pmsg_size, 4096, flags & PSTORE_FLAGS_PMSG);
+ verify_size(console_size, 4096, flags & PSTORE_FLAGS_CONSOLE);
+ verify_size(ftrace_size, 4096, flags & PSTORE_FLAGS_FTRACE);
#undef verify_size
- pstore_zone_info->total_size = dev->total_size;
+ pstore_zone_info->total_size = total_size;
pstore_zone_info->max_reason = max_reason;
- pstore_zone_info->ops = dev->ops;
+ pstore_zone_info->ops = ops;
ret = register_pstore_zone(pstore_zone_info);
if (ret) {
kfree(pstore_zone_info);
pstore_zone_info = NULL;
}
+out_unlock:
+ mutex_unlock(&pstore_blk_lock);
return ret;
}
+EXPORT_SYMBOL_GPL(register_pstore_device);
+
/**
- * register_pstore_device() - register non-block device to pstore/blk
- *
- * @dev: non-block device information
+ * unregister_pstore_device() - unregister a device from pstore/blk
*
- * Return:
- * * 0 - OK
- * * Others - something error.
+ * @ops: device operations
*/
-int register_pstore_device(struct pstore_device_info *dev)
+void unregister_pstore_device(const struct pstore_zone_ops *ops)
{
- int ret;
-
mutex_lock(&pstore_blk_lock);
- ret = __register_pstore_device(dev);
- mutex_unlock(&pstore_blk_lock);
-
- return ret;
-}
-EXPORT_SYMBOL_GPL(register_pstore_device);
-
-static void __unregister_pstore_device(struct pstore_device_info *dev)
-{
- lockdep_assert_held(&pstore_blk_lock);
- if (pstore_zone_info && pstore_zone_info->ops == dev->ops) {
+ if (pstore_zone_info && pstore_zone_info->ops == ops) {
unregister_pstore_zone(pstore_zone_info);
kfree(pstore_zone_info);
pstore_zone_info = NULL;
}
-}
-
-/**
- * unregister_pstore_device() - unregister non-block device from pstore/blk
- *
- * @dev: non-block device information
- */
-void unregister_pstore_device(struct pstore_device_info *dev)
-{
- mutex_lock(&pstore_blk_lock);
- __unregister_pstore_device(dev);
mutex_unlock(&pstore_blk_lock);
}
EXPORT_SYMBOL_GPL(unregister_pstore_device);
@@ -271,7 +261,6 @@ static int __init pstore_blk_init(void)
{
char bdev_name[BDEVNAME_SIZE];
struct block_device *bdev;
- struct pstore_device_info dev;
int ret = -ENODEV;
fmode_t mode = FMODE_READ | FMODE_WRITE | FMODE_EXCL;
sector_t nr_sects;
@@ -306,11 +295,8 @@ static int __init pstore_blk_init(void)
/* psblk_bdev must be assigned before register to pstore/blk */
psblk_bdev = bdev;
- memset(&dev, 0, sizeof(dev));
- dev.ops = &pstore_blk_zone_ops;
- dev.total_size = nr_sects << SECTOR_SHIFT;
-
- ret = register_pstore_device(&dev);
+ ret = register_pstore_device(&pstore_blk_zone_ops,
+ nr_sects << SECTOR_SHIFT, 0);
if (ret)
goto err_put_bdev;
@@ -327,11 +313,9 @@ late_initcall(pstore_blk_init);
static void __exit pstore_blk_exit(void)
{
- struct pstore_device_info dev = { .ops = &pstore_blk_zone_ops };
-
if (!psblk_bdev)
return;
- unregister_pstore_device(&dev);
+ unregister_pstore_device(&pstore_blk_zone_ops);
blkdev_put(psblk_bdev, FMODE_READ | FMODE_WRITE | FMODE_EXCL);
}
module_exit(pstore_blk_exit);
diff --git a/include/linux/pstore_blk.h b/include/linux/pstore_blk.h
index 095a44ce5e122c..0abd412a6cb3e3 100644
--- a/include/linux/pstore_blk.h
+++ b/include/linux/pstore_blk.h
@@ -7,24 +7,9 @@
#include <linux/pstore.h>
#include <linux/pstore_zone.h>
-/**
- * struct pstore_device_info - back-end pstore/blk driver structure.
- *
- * @total_size: The total size in bytes pstore/blk can use. It must be greater
- * than 4096 and be multiple of 4096.
- * @flags: Refer to macro starting with PSTORE_FLAGS defined in
- * linux/pstore.h. It means what front-ends this device support.
- * Zero means all backends for compatible.
- * @ops: operations to access the device.
- */
-struct pstore_device_info {
- unsigned long total_size;
- unsigned int flags;
- const struct pstore_zone_ops *ops;
-};
-
-int register_pstore_device(struct pstore_device_info *dev);
-void unregister_pstore_device(struct pstore_device_info *dev);
+int register_pstore_device(const struct pstore_zone_ops *ops,
+ unsigned long total_size, unsigned int flags);
+void unregister_pstore_device(const struct pstore_zone_ops *ops);
/**
* struct pstore_blk_config - the pstore_blk backend configuration
--
2.28.0
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