From f6a1ed10864b7540fa758bbccf3433fe17070329 Mon Sep 17 00:00:00 2001 From: Mikulas Patocka Date: Fri, 4 Sep 2009 20:40:22 +0100 Subject: [PATCH] dm table: fix queue_limit checking device iterator The logic to check for valid device areas is inverted relative to proper use with iterate_devices. The iterate_devices method calls its callback for every underlying device in the target. If any callback returns non-zero, iterate_devices exits immediately. But the callback device_area_is_valid() returns 0 on error and 1 on success. The overall effect without is that an error is issued only if every device is invalid. This patch renames device_area_is_valid to device_area_is_invalid and inverts the logic so that one invalid device is sufficient to raise an error. Signed-off-by: Mikulas Patocka Signed-off-by: Mike Snitzer Signed-off-by: Alasdair G Kergon --- drivers/md/dm-table.c | 22 +++++++++++----------- 1 file changed, 11 insertions(+), 11 deletions(-) diff --git a/drivers/md/dm-table.c b/drivers/md/dm-table.c index d952b3441913..aa60526075d7 100644 --- a/drivers/md/dm-table.c +++ b/drivers/md/dm-table.c @@ -343,10 +343,10 @@ static void close_dev(struct dm_dev_internal *d, struct mapped_device *md) } /* - * If possible, this checks an area of a destination device is valid. + * If possible, this checks an area of a destination device is invalid. */ -static int device_area_is_valid(struct dm_target *ti, struct dm_dev *dev, - sector_t start, sector_t len, void *data) +static int device_area_is_invalid(struct dm_target *ti, struct dm_dev *dev, + sector_t start, sector_t len, void *data) { struct queue_limits *limits = data; struct block_device *bdev = dev->bdev; @@ -357,16 +357,16 @@ static int device_area_is_valid(struct dm_target *ti, struct dm_dev *dev, char b[BDEVNAME_SIZE]; if (!dev_size) - return 1; + return 0; if ((start >= dev_size) || (start + len > dev_size)) { DMWARN("%s: %s too small for target", dm_device_name(ti->table->md), bdevname(bdev, b)); - return 0; + return 1; } if (logical_block_size_sectors <= 1) - return 1; + return 0; if (start & (logical_block_size_sectors - 1)) { DMWARN("%s: start=%llu not aligned to h/w " @@ -374,7 +374,7 @@ static int device_area_is_valid(struct dm_target *ti, struct dm_dev *dev, dm_device_name(ti->table->md), (unsigned long long)start, limits->logical_block_size, bdevname(bdev, b)); - return 0; + return 1; } if (len & (logical_block_size_sectors - 1)) { @@ -383,10 +383,10 @@ static int device_area_is_valid(struct dm_target *ti, struct dm_dev *dev, dm_device_name(ti->table->md), (unsigned long long)len, limits->logical_block_size, bdevname(bdev, b)); - return 0; + return 1; } - return 1; + return 0; } /* @@ -1000,8 +1000,8 @@ int dm_calculate_queue_limits(struct dm_table *table, * Check each device area is consistent with the target's * overall queue limits. */ - if (!ti->type->iterate_devices(ti, device_area_is_valid, - &ti_limits)) + if (ti->type->iterate_devices(ti, device_area_is_invalid, + &ti_limits)) return -EINVAL; combine_limits: