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Commit f655675b authored by NeilBrown's avatar NeilBrown Committed by Linus Torvalds
Browse files

[PATCH] md: Allow the write_mostly flag to be set via sysfs 



It appears in /sys/mdX/md/dev-YYY/state
and can be set or cleared by writing 'writemostly' or '-writemostly'
respectively.

Signed-off-by: default avatarNeil Brown <neilb@suse.de>
Signed-off-by: default avatarAndrew Morton <akpm@osdl.org>
Signed-off-by: default avatarLinus Torvalds <torvalds@osdl.org>
parent a94213b1

Documentation/md.txt

+5 −0
Original line number Diff line number Diff line
@@ -309,6 +309,9 @@ Each directory contains: 
	      faulty   - device has been kicked from active use due to

                         a detected fault

	      in_sync  - device is a fully in-sync member of the array

	      writemostly - device will only be subject to read

		         requests if there are no other options.

			 This applies only to raid1 arrays.

	      spare    - device is working, but not a full member.

			 This includes spares that are in the process

			 of being recoverred to
@@ -316,6 +319,8 @@ Each directory contains: 
	This can be written to.

	Writing "faulty"  simulates a failure on the device.

	Writing "remove" removes the device from the array.

	Writing "writemostly" sets the writemostly flag.

	Writing "-writemostly" clears the writemostly flag.



      errors

	An approximate count of read errors that have been detected on

drivers/md/md.c

+12 −0
Original line number Diff line number Diff line
@@ -1737,6 +1737,10 @@ state_show(mdk_rdev_t *rdev, char *page) 
		len += sprintf(page+len, "%sin_sync",sep);

		sep = ",";

	}

	if (test_bit(WriteMostly, &rdev->flags)) {

		len += sprintf(page+len, "%swrite_mostly",sep);

		sep = ",";

	}

	if (!test_bit(Faulty, &rdev->flags) &&

	    !test_bit(In_sync, &rdev->flags)) {

		len += sprintf(page+len, "%sspare", sep);
@@ -1751,6 +1755,8 @@ state_store(mdk_rdev_t *rdev, const char *buf, size_t len) 
	/* can write

	 *  faulty  - simulates and error

	 *  remove  - disconnects the device

	 *  writemostly - sets write_mostly

	 *  -writemostly - clears write_mostly

	 */

	int err = -EINVAL;

	if (cmd_match(buf, "faulty") && rdev->mddev->pers) {
@@ -1766,6 +1772,12 @@ state_store(mdk_rdev_t *rdev, const char *buf, size_t len) 
			md_new_event(mddev);

			err = 0;

		}

	} else if (cmd_match(buf, "writemostly")) {

		set_bit(WriteMostly, &rdev->flags);

		err = 0;

	} else if (cmd_match(buf, "-writemostly")) {

		clear_bit(WriteMostly, &rdev->flags);

		err = 0;

	}

	return err ? err : len;

}