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dm writecache: allow allocations larger than 2GiB

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The function kvmalloc_node limits the allocation size to INT_MAX. This
limit will be overflowed if dm-writecache attempts to map a device with
1TiB or larger length. This commit changes kvmalloc_array to vmalloc_array
to avoid the limit.

The commit also changes vmalloc(array_size()) to vmalloc_array().

Signed-off-by: Mikulas Patocka <mpatocka@redhat.com>
Signed-off-by: Mike Snitzer <snitzer@kernel.org>
This commit is contained in:
Mikulas Patocka 2024-01-09 16:00:57 +01:00 committed by Mike Snitzer
parent 9cf11ce06e
commit 40ef8756fb
1 changed files with 4 additions and 4 deletions
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8
drivers/md/dm-writecache.c
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@ -299,7 +299,7 @@ static int persistent_memory_claim(struct dm_writecache *wc)
long i;
wc->memory_map = NULL;
pages = kvmalloc_array(p, sizeof(struct page *), GFP_KERNEL);
pages = vmalloc_array(p, sizeof(struct page *));
if (!pages) {
r = -ENOMEM;
goto err2;
@ -330,7 +330,7 @@ static int persistent_memory_claim(struct dm_writecache *wc)
r = -ENOMEM;
goto err3;
}
kvfree(pages);
vfree(pages);
wc->memory_vmapped = true;
}
@ -341,7 +341,7 @@ static int persistent_memory_claim(struct dm_writecache *wc)
return 0;
err3:
kvfree(pages);
vfree(pages);
err2:
dax_read_unlock(id);
err1:
@ -962,7 +962,7 @@ static int writecache_alloc_entries(struct dm_writecache *wc)
if (wc->entries)
return 0;
wc->entries = vmalloc(array_size(sizeof(struct wc_entry), wc->n_blocks));
wc->entries = vmalloc_array(wc->n_blocks, sizeof(struct wc_entry));
if (!wc->entries)
return -ENOMEM;
for (b = 0; b < wc->n_blocks; b++) {