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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 <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Mikulas Patocka 2009-09-04 20:40:22 +01:00 committed by Alasdair G Kergon
parent 8811f46c1f
commit f6a1ed1086
1 changed files with 11 additions and 11 deletions
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22
drivers/md/dm-table.c
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@ -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: