pstore/blk: Provide way to query pstore configuration (1525fb3b) · Commits · 戴 / test

fs/pstore/blk.c

+30 −7

Original line number	Diff line number	Diff line
		@@ -94,6 +94,17 @@ struct bdev_info {
		sector_t start_sect;
		};

		#define check_size(name, alignsize) ({ \
		long _##name_ = (name); \
		_##name_ = _##name_ <= 0 ? 0 : (_##name_ * 1024); \
		if (_##name_ & ((alignsize) - 1)) { \
		pr_info(#name " must align to %d\n", \
		(alignsize)); \
		_##name_ = ALIGN(name, (alignsize)); \
		} \
		_##name_; \
		})

		/**
		* struct pstore_device_info - back-end pstore/blk driver structure.
		*
		@@ -149,13 +160,11 @@ static int psblk_register_do(struct pstore_device_info *dev)
		dev->flags = UINT_MAX;

		#define verify_size(name, alignsize, enabled) { \
		long _##name_ = (enabled) ? (name) : 0; \
		_##name_ = _##name_ <= 0 ? 0 : (_##name_ * 1024); \
		if (_##name_ & ((alignsize) - 1)) { \
		pr_info(#name " must align to %d\n", \
		(alignsize)); \
		_##name_ = ALIGN(name, (alignsize)); \
		} \
		long _##name_; \
		if (enabled) \
		_##name_ = check_size(name, alignsize); \
		else \
		_##name_ = 0; \
		name = _##name_ / 1024; \
		pstore_zone_info->name = _##name_; \
		}
		@@ -453,6 +462,20 @@ void unregister_pstore_blk(unsigned int major)
		}
		EXPORT_SYMBOL_GPL(unregister_pstore_blk);

		/* get information of pstore/blk */
		int pstore_blk_get_config(struct pstore_blk_config *info)
		{
		strncpy(info->device, blkdev, 80);
		info->max_reason = max_reason;
		info->kmsg_size = check_size(kmsg_size, 4096);
		info->pmsg_size = check_size(pmsg_size, 4096);
		info->ftrace_size = check_size(ftrace_size, 4096);
		info->console_size = check_size(console_size, 4096);

		return 0;
		}
		EXPORT_SYMBOL_GPL(pstore_blk_get_config);

		static void __exit pstore_blk_exit(void)
		{
		mutex_lock(&pstore_blk_lock);

include/linux/pstore_blk.h

+28 −0

Original line number	Diff line number	Diff line
		@@ -49,4 +49,32 @@ struct pstore_blk_info {
		int register_pstore_blk(struct pstore_blk_info *info);
		void unregister_pstore_blk(unsigned int major);

		/**
		* struct pstore_blk_config - the pstore_blk backend configuration
		*
		* @device: Name of the desired block device
		* @max_reason: Maximum kmsg dump reason to store to block device
		* @kmsg_size: Total size of for kmsg dumps
		* @pmsg_size: Total size of the pmsg storage area
		* @console_size: Total size of the console storage area
		* @ftrace_size: Total size for ftrace logging data (for all CPUs)
		*/
		struct pstore_blk_config {
		char device[80];
		enum kmsg_dump_reason max_reason;
		unsigned long kmsg_size;
		unsigned long pmsg_size;
		unsigned long console_size;
		unsigned long ftrace_size;
		};

		/**
		* pstore_blk_get_config - get a copy of the pstore_blk backend configuration
		*
		* @info: The sturct pstore_blk_config to be filled in
		*
		* Failure returns negative error code, and success returns 0.
		*/
		int pstore_blk_get_config(struct pstore_blk_config *info);

		#endif

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