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91 lines
2.2 KiB
91 lines
2.2 KiB
From: Hannes Reinecke <hare@suse.de>
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Subject: dm multipath devices are not getting created for readonly devices
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References: bnc#382705
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Patch-mainline: not yet
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Currently we cannot create device-mapper tables for multipath devices
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whenever they are read-only.
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This patch modifies the device-mapper to set the 'READ-ONLY' flag
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automatically whenever a read-only is added to the table.
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Signed-off-by: Hannes Reinecke <hare@suse.de>
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---
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drivers/md/dm-table.c | 10 +++++++++-
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drivers/md/dm.c | 18 ++++++++++++++++--
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2 files changed, 25 insertions(+), 3 deletions(-)
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--- a/drivers/md/dm-table.c
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+++ b/drivers/md/dm-table.c
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@@ -462,11 +462,19 @@ static int __table_get_device(struct dm_
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dd->dm_dev.mode = mode;
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dd->dm_dev.bdev = NULL;
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- if ((r = open_dev(dd, dev, t->md))) {
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+ r = open_dev(dd, dev, t->md);
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+ if (r == -EROFS) {
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+ dd->dm_dev.mode &= ~FMODE_WRITE;
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+ r = open_dev(dd, dev, t->md);
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+ }
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+ if (r) {
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kfree(dd);
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return r;
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}
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+ if (dd->dm_dev.mode != mode)
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+ t->mode = dd->dm_dev.mode;
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+
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format_dev_t(dd->dm_dev.name, dev);
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atomic_set(&dd->count, 0);
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--- a/drivers/md/dm.c
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+++ b/drivers/md/dm.c
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@@ -337,16 +337,25 @@ int dm_deleting_md(struct mapped_device
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static int dm_blk_open(struct block_device *bdev, fmode_t mode)
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{
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struct mapped_device *md;
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+ int retval = 0;
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spin_lock(&_minor_lock);
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md = bdev->bd_disk->private_data;
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- if (!md)
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+ if (!md) {
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+ retval = -ENXIO;
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goto out;
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+ }
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if (test_bit(DMF_FREEING, &md->flags) ||
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dm_deleting_md(md)) {
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md = NULL;
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+ retval = -ENXIO;
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+ goto out;
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+ }
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+ if (get_disk_ro(md->disk) && (mode & FMODE_WRITE)) {
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+ md = NULL;
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+ retval = -EROFS;
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goto out;
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}
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@@ -356,7 +365,7 @@ static int dm_blk_open(struct block_devi
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out:
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spin_unlock(&_minor_lock);
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- return md ? 0 : -ENXIO;
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+ return retval;
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}
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static int dm_blk_close(struct gendisk *disk, fmode_t mode)
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@@ -2093,6 +2102,11 @@ static struct dm_table *__bind(struct ma
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old_map = md->map;
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md->map = t;
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dm_table_set_restrictions(t, q, limits);
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+ if (!(dm_table_get_mode(t) & FMODE_WRITE)) {
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+ set_disk_ro(md->disk, 1);
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+ } else {
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+ set_disk_ro(md->disk, 0);
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+ }
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write_unlock_irqrestore(&md->map_lock, flags);
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return old_map;
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