UBI: power cut emulation for testing (50269067) · Commits · 戴 / test

drivers/mtd/ubi/debug.c

+87 −2

Original line number	Diff line number	Diff line
		@@ -263,7 +263,7 @@ static ssize_t dfs_file_read(struct file file, char __user user_buf,
		struct dentry *dent = file->f_path.dentry;
		struct ubi_device *ubi;
		struct ubi_debug_info *d;
		char buf[3];
		char buf[8];
		int val;

		ubi = ubi_get_device(ubi_num);
		@@ -283,6 +283,22 @@ static ssize_t dfs_file_read(struct file file, char __user user_buf,
		val = d->emulate_bitflips;
		else if (dent == d->dfs_emulate_io_failures)
		val = d->emulate_io_failures;
		else if (dent == d->dfs_emulate_power_cut) {
		snprintf(buf, sizeof(buf), "%u\n", d->emulate_power_cut);
		count = simple_read_from_buffer(user_buf, count, ppos,
		buf, strlen(buf));
		goto out;
		} else if (dent == d->dfs_power_cut_min) {
		snprintf(buf, sizeof(buf), "%u\n", d->power_cut_min);
		count = simple_read_from_buffer(user_buf, count, ppos,
		buf, strlen(buf));
		goto out;
		} else if (dent == d->dfs_power_cut_max) {
		snprintf(buf, sizeof(buf), "%u\n", d->power_cut_max);
		count = simple_read_from_buffer(user_buf, count, ppos,
		buf, strlen(buf));
		goto out;
		}
		else {
		count = -EINVAL;
		goto out;
		@@ -311,7 +327,7 @@ static ssize_t dfs_file_write(struct file file, const char __user user_buf,
		struct ubi_device *ubi;
		struct ubi_debug_info *d;
		size_t buf_size;
		char buf[8];
		char buf[8] = {0};
		int val;

		ubi = ubi_get_device(ubi_num);
		@@ -325,6 +341,21 @@ static ssize_t dfs_file_write(struct file file, const char __user user_buf,
		goto out;
		}

		if (dent == d->dfs_power_cut_min) {
		if (kstrtouint(buf, 0, &d->power_cut_min) != 0)
		count = -EINVAL;
		goto out;
		} else if (dent == d->dfs_power_cut_max) {
		if (kstrtouint(buf, 0, &d->power_cut_max) != 0)
		count = -EINVAL;
		goto out;
		} else if (dent == d->dfs_emulate_power_cut) {
		if (kstrtoint(buf, 0, &val) != 0)
		count = -EINVAL;
		d->emulate_power_cut = val;
		goto out;
		}

		if (buf[0] == '1')
		val = 1;
		else if (buf[0] == '0')
		@@ -438,6 +469,27 @@ int ubi_debugfs_init_dev(struct ubi_device *ubi)
		goto out_remove;
		d->dfs_emulate_io_failures = dent;

		fname = "tst_emulate_power_cut";
		dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num,
		&dfs_fops);
		if (IS_ERR_OR_NULL(dent))
		goto out_remove;
		d->dfs_emulate_power_cut = dent;

		fname = "tst_emulate_power_cut_min";
		dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num,
		&dfs_fops);
		if (IS_ERR_OR_NULL(dent))
		goto out_remove;
		d->dfs_power_cut_min = dent;

		fname = "tst_emulate_power_cut_max";
		dent = debugfs_create_file(fname, S_IWUSR, d->dfs_dir, (void *)ubi_num,
		&dfs_fops);
		if (IS_ERR_OR_NULL(dent))
		goto out_remove;
		d->dfs_power_cut_max = dent;

		return 0;

		out_remove:
		@@ -458,3 +510,36 @@ void ubi_debugfs_exit_dev(struct ubi_device *ubi)
		if (IS_ENABLED(CONFIG_DEBUG_FS))
		debugfs_remove_recursive(ubi->dbg.dfs_dir);
		}

		/**
		* ubi_dbg_power_cut - emulate a power cut if it is time to do so
		* @ubi: UBI device description object
		* @caller: Flags set to indicate from where the function is being called
		*
		* Returns non-zero if a power cut was emulated, zero if not.
		*/
		int ubi_dbg_power_cut(struct ubi_device *ubi, int caller)
		{
		unsigned int range;

		if ((ubi->dbg.emulate_power_cut & caller) == 0)
		return 0;

		if (ubi->dbg.power_cut_counter == 0) {
		ubi->dbg.power_cut_counter = ubi->dbg.power_cut_min;

		if (ubi->dbg.power_cut_max > ubi->dbg.power_cut_min) {
		range = ubi->dbg.power_cut_max - ubi->dbg.power_cut_min;
		ubi->dbg.power_cut_counter += prandom_u32() % range;
		}
		return 0;
		}

		ubi->dbg.power_cut_counter--;
		if (ubi->dbg.power_cut_counter)
		return 0;

		ubi_msg(ubi, "XXXXXXXXXXXXXXX emulating a power cut XXXXXXXXXXXXXXXX");
		ubi_ro_mode(ubi);
		return 1;
		}

drivers/mtd/ubi/debug.h

+2 −0

Original line number	Diff line number	Diff line
		@@ -137,4 +137,6 @@ static inline void ubi_enable_dbg_chk_fastmap(struct ubi_device *ubi)
		{
		ubi->dbg.chk_fastmap = 1;
		}

		int ubi_dbg_power_cut(struct ubi_device *ubi, int caller);
		#endif /* !__UBI_DEBUG_H__ */

drivers/mtd/ubi/io.c

+6 −0

Original line number	Diff line number	Diff line
		@@ -859,6 +859,9 @@ int ubi_io_write_ec_hdr(struct ubi_device *ubi, int pnum,
		if (err)
		return err;

		if (ubi_dbg_power_cut(ubi, POWER_CUT_EC_WRITE))
		return -EROFS;

		err = ubi_io_write(ubi, ec_hdr, pnum, 0, ubi->ec_hdr_alsize);
		return err;
		}
		@@ -1106,6 +1109,9 @@ int ubi_io_write_vid_hdr(struct ubi_device *ubi, int pnum,
		if (err)
		return err;

		if (ubi_dbg_power_cut(ubi, POWER_CUT_VID_WRITE))
		return -EROFS;

		p = (char *)vid_hdr - ubi->vid_hdr_shift;
		err = ubi_io_write(ubi, p, pnum, ubi->vid_hdr_aloffset,
		ubi->vid_hdr_alsize);

drivers/mtd/ubi/ubi.h

+25 −0

Original line number	Diff line number	Diff line
		@@ -151,6 +151,17 @@ enum {
		UBI_BAD_FASTMAP,
		};

		/*
		* Flags for emulate_power_cut in ubi_debug_info
		*
		* POWER_CUT_EC_WRITE: Emulate a power cut when writing an EC header
		* POWER_CUT_VID_WRITE: Emulate a power cut when writing a VID header
		*/
		enum {
		POWER_CUT_EC_WRITE = 0x01,
		POWER_CUT_VID_WRITE = 0x02,
		};

		/**
		* struct ubi_wl_entry - wear-leveling entry.
		* @u.rb: link in the corresponding (free/used) RB-tree
		@@ -360,6 +371,10 @@ struct ubi_wl_entry;
		* @disable_bgt: disable the background task for testing purposes
		* @emulate_bitflips: emulate bit-flips for testing purposes
		* @emulate_io_failures: emulate write/erase failures for testing purposes
		* @emulate_power_cut: emulate power cut for testing purposes
		* @power_cut_counter: count down for writes left until emulated power cut
		* @power_cut_min: minimum number of writes before emulating a power cut
		* @power_cut_max: maximum number of writes until emulating a power cut
		* @dfs_dir_name: name of debugfs directory containing files of this UBI device
		* @dfs_dir: direntry object of the UBI device debugfs directory
		* @dfs_chk_gen: debugfs knob to enable UBI general extra checks
		@@ -368,6 +383,9 @@ struct ubi_wl_entry;
		* @dfs_disable_bgt: debugfs knob to disable the background task
		* @dfs_emulate_bitflips: debugfs knob to emulate bit-flips
		* @dfs_emulate_io_failures: debugfs knob to emulate write/erase failures
		* @dfs_emulate_power_cut: debugfs knob to emulate power cuts
		* @dfs_power_cut_min: debugfs knob for minimum writes before power cut
		* @dfs_power_cut_max: debugfs knob for maximum writes until power cut
		*/
		struct ubi_debug_info {
		unsigned int chk_gen:1;
		@@ -376,6 +394,10 @@ struct ubi_debug_info {
		unsigned int disable_bgt:1;
		unsigned int emulate_bitflips:1;
		unsigned int emulate_io_failures:1;
		unsigned int emulate_power_cut:2;
		unsigned int power_cut_counter;
		unsigned int power_cut_min;
		unsigned int power_cut_max;
		char dfs_dir_name[UBI_DFS_DIR_LEN + 1];
		struct dentry *dfs_dir;
		struct dentry *dfs_chk_gen;
		@@ -384,6 +406,9 @@ struct ubi_debug_info {
		struct dentry *dfs_disable_bgt;
		struct dentry *dfs_emulate_bitflips;
		struct dentry *dfs_emulate_io_failures;
		struct dentry *dfs_emulate_power_cut;
		struct dentry *dfs_power_cut_min;
		struct dentry *dfs_power_cut_max;
		};

		/**

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