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| author | NeilBrown <neilb@suse.de> | 2006-06-26 00:28:01 -0700 |
|---|---|---|
| committer | Linus Torvalds <torvalds@g5.osdl.org> | 2006-06-26 09:58:40 -0700 |
| commit | f655675b3fe09c4d0506d357527fe07544623009 (patch) | |
| tree | 969a798b6ba25b88f08b0f9cfe1aed323be81d3e | |
| parent | a94213b1fa7b26dcc271bf4b4f9eebf1f1af33a2 (diff) | |
| download | linux-f655675b3fe09c4d0506d357527fe07544623009.tar.gz linux-f655675b3fe09c4d0506d357527fe07544623009.tar.bz2 linux-f655675b3fe09c4d0506d357527fe07544623009.zip | |
[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: Neil Brown <neilb@suse.de>
Signed-off-by: Andrew Morton <akpm@osdl.org>
Signed-off-by: Linus Torvalds <torvalds@osdl.org>
| -rw-r--r-- | Documentation/md.txt | 5 | ||||
| -rw-r--r-- | drivers/md/md.c | 12 |
2 files changed, 17 insertions, 0 deletions
diff --git a/Documentation/md.txt b/Documentation/md.txt index f3d418ba625e..0668f9dc9d29 100644 --- a/Documentation/md.txt +++ b/Documentation/md.txt @@ -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 diff --git a/drivers/md/md.c b/drivers/md/md.c index 8603c0692eab..331b1bc95735 100644 --- a/drivers/md/md.c +++ b/drivers/md/md.c @@ -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; } |