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dm snapshot: use unsigned integer chunk size

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Use unsigned integer chunk size.

Maximum chunk size is 512kB, there won't ever be need to use 4GB chunk size,
so the number can be 32-bit. This fixes compiler failure on 32-bit systems
with large block devices.

Cc: stable@kernel.org
Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@redhat.com>
Reviewed-by: Jonathan Brassow <jbrassow@redhat.com>
Signed-off-by: Alasdair G Kergon <agk@redhat.com>
This commit is contained in:
Mikulas Patocka
2009-10-16 23:18:17 +01:00
committed by Alasdair G Kergon
parent 4c6fff445d
commit df96eee679
4 changed files with 25 additions and 23 deletions
Download Patch File Download Diff File Expand all files Collapse all files

20
drivers/md/dm-exception-store.c
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@@ -155,7 +155,8 @@ static int set_chunk_size(struct dm_exception_store *store,
char *value;
chunk_size_ulong = simple_strtoul(chunk_size_arg, &value, 10);
if (*chunk_size_arg == '\0' || *value != '\0') {
if (*chunk_size_arg == '\0' || *value != '\0' ||
chunk_size_ulong > UINT_MAX) {
*error = "Invalid chunk size";
return -EINVAL;
}
@@ -171,34 +172,35 @@ static int set_chunk_size(struct dm_exception_store *store,
*/
chunk_size_ulong = round_up(chunk_size_ulong, PAGE_SIZE >> 9);
return dm_exception_store_set_chunk_size(store, chunk_size_ulong,
return dm_exception_store_set_chunk_size(store,
(unsigned) chunk_size_ulong,
error);
}
int dm_exception_store_set_chunk_size(struct dm_exception_store *store,
unsigned long chunk_size_ulong,
unsigned chunk_size,
char **error)
{
/* Check chunk_size is a power of 2 */
if (!is_power_of_2(chunk_size_ulong)) {
if (!is_power_of_2(chunk_size)) {
*error = "Chunk size is not a power of 2";
return -EINVAL;
}
/* Validate the chunk size against the device block size */
if (chunk_size_ulong % (bdev_logical_block_size(store->cow->bdev) >> 9)) {
if (chunk_size % (bdev_logical_block_size(store->cow->bdev) >> 9)) {
*error = "Chunk size is not a multiple of device blocksize";
return -EINVAL;
}
if (chunk_size_ulong > INT_MAX >> SECTOR_SHIFT) {
if (chunk_size > INT_MAX >> SECTOR_SHIFT) {
*error = "Chunk size is too high";
return -EINVAL;
}
store->chunk_size = chunk_size_ulong;
store->chunk_mask = chunk_size_ulong - 1;
store->chunk_shift = ffs(chunk_size_ulong) - 1;
store->chunk_size = chunk_size;
store->chunk_mask = chunk_size - 1;
store->chunk_shift = ffs(chunk_size) - 1;
return 0;
}