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dm-bufio: fix warnings about duplicate slab caches

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The commit 4c39529663 adds a warning about duplicate cache names if
CONFIG_DEBUG_VM is selected. These warnings are triggered by the dm-bufio
code. The dm-bufio code allocates a slab cache with each client. It is
not possible to preallocate the caches in the module init function
because the size of auxiliary per-buffer data is not known at this point.

So, this commit changes dm-bufio so that it appends a unique atomic value
to the cache name, to avoid the warnings.

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Fixes: 4c39529663 ("slab: Warn on duplicate cache names when DEBUG_VM=y")
This commit is contained in:
Mikulas Patocka 2024-11-11 16:48:18 +01:00
parent 2d5404caa8
commit 42964e4b5e
1 changed files with 8 additions and 4 deletions
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12
drivers/md/dm-bufio.c
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@ -2471,7 +2471,8 @@ struct dm_bufio_client *dm_bufio_client_create(struct block_device *bdev, unsign
int r;
unsigned int num_locks;
struct dm_bufio_client *c;
char slab_name[27];
char slab_name[64];
static atomic_t seqno = ATOMIC_INIT(0);
if (!block_size || block_size & ((1 << SECTOR_SHIFT) - 1)) {
DMERR("%s: block size not specified or is not multiple of 512b", __func__);
@ -2522,7 +2523,8 @@ struct dm_bufio_client *dm_bufio_client_create(struct block_device *bdev, unsign
(block_size < PAGE_SIZE || !is_power_of_2(block_size))) {
unsigned int align = min(1U << __ffs(block_size), (unsigned int)PAGE_SIZE);
snprintf(slab_name, sizeof(slab_name), "dm_bufio_cache-%u", block_size);
snprintf(slab_name, sizeof(slab_name), "dm_bufio_cache-%u-%u",
block_size, atomic_inc_return(&seqno));
c->slab_cache = kmem_cache_create(slab_name, block_size, align,
SLAB_RECLAIM_ACCOUNT, NULL);
if (!c->slab_cache) {
@ -2531,9 +2533,11 @@ struct dm_bufio_client *dm_bufio_client_create(struct block_device *bdev, unsign
}
}
if (aux_size)
snprintf(slab_name, sizeof(slab_name), "dm_bufio_buffer-%u", aux_size);
snprintf(slab_name, sizeof(slab_name), "dm_bufio_buffer-%u-%u",
aux_size, atomic_inc_return(&seqno));
else
snprintf(slab_name, sizeof(slab_name), "dm_bufio_buffer");
snprintf(slab_name, sizeof(slab_name), "dm_bufio_buffer-%u",
atomic_inc_return(&seqno));
c->slab_buffer = kmem_cache_create(slab_name, sizeof(struct dm_buffer) + aux_size,
0, SLAB_RECLAIM_ACCOUNT, NULL);
if (!c->slab_buffer) {