Applied, thanks.
(I also removed the "gfp_t flags" argument because its always GFP_KERNEL.
Mikulas
On Tue, 5 Aug 2025, Dmitry Antipov wrote:
> Following commit ebbd17695e9e ("dm: ima: avoid extra calls to
> strlen()"), convert 'dm_ima_alloc_and_copy_capacity_str()' to
> return the number of characters emitted by 'scnprintf()' and
> simplify the users accordingly. Compile tested only.
>
> Signed-off-by: Dmitry Antipov <dmanti...@yandex.ru>
> ---
> drivers/md/dm-ima.c | 40 ++++++++++++++++------------------------
> 1 file changed, 16 insertions(+), 24 deletions(-)
>
> diff --git a/drivers/md/dm-ima.c b/drivers/md/dm-ima.c
> index 8b50c908c6f4..f5c0ecc7cb0b 100644
> --- a/drivers/md/dm-ima.c
> +++ b/drivers/md/dm-ima.c
> @@ -157,10 +157,8 @@ static int dm_ima_alloc_and_copy_capacity_str(struct
> mapped_device *md, char **c
> if (!(*capacity_str))
> return -ENOMEM;
>
> - scnprintf(*capacity_str, DM_IMA_DEVICE_BUF_LEN,
> "current_device_capacity=%llu;",
> - capacity);
> -
> - return 0;
> + return scnprintf(*capacity_str, DM_IMA_DEVICE_BUF_LEN,
> "current_device_capacity=%llu;",
> + capacity);
> }
>
> /*
> @@ -371,18 +369,18 @@ void dm_ima_measure_on_device_resume(struct
> mapped_device *md, bool swap)
> {
> char *device_table_data, *dev_name = NULL, *dev_uuid = NULL,
> *capacity_str = NULL;
> char active[] = "active_table_hash=";
> - unsigned int active_len = strlen(active), capacity_len = 0;
> + unsigned int active_len = strlen(active);
> unsigned int l = 0;
> bool noio = true;
> bool nodata = true;
> - int r;
> + int capacity_len;
>
> device_table_data = dm_ima_alloc(DM_IMA_DEVICE_BUF_LEN, GFP_KERNEL,
> noio);
> if (!device_table_data)
> return;
>
> - r = dm_ima_alloc_and_copy_capacity_str(md, &capacity_str, noio);
> - if (r)
> + capacity_len = dm_ima_alloc_and_copy_capacity_str(md, &capacity_str,
> noio);
> + if (capacity_len < 0)
> goto error;
>
> memcpy(device_table_data + l, DM_IMA_VERSION_STR,
> md->ima.dm_version_str_len);
> @@ -445,8 +443,7 @@ void dm_ima_measure_on_device_resume(struct mapped_device
> *md, bool swap)
> }
>
> if (nodata) {
> - r = dm_ima_alloc_and_copy_name_uuid(md, &dev_name, &dev_uuid,
> noio);
> - if (r)
> + if (dm_ima_alloc_and_copy_name_uuid(md, &dev_name, &dev_uuid,
> noio))
> goto error;
>
> l = scnprintf(device_table_data, DM_IMA_DEVICE_BUF_LEN,
> @@ -454,7 +451,6 @@ void dm_ima_measure_on_device_resume(struct mapped_device
> *md, bool swap)
> DM_IMA_VERSION_STR, dev_name, dev_uuid);
> }
>
> - capacity_len = strlen(capacity_str);
> memcpy(device_table_data + l, capacity_str, capacity_len);
> l += capacity_len;
>
> @@ -483,18 +479,17 @@ void dm_ima_measure_on_device_remove(struct
> mapped_device *md, bool remove_all)
> unsigned int device_active_len = strlen(device_active_str);
> unsigned int device_inactive_len = strlen(device_inactive_str);
> unsigned int remove_all_len = strlen(remove_all_str);
> - unsigned int capacity_len = 0;
> unsigned int l = 0;
> bool noio = true;
> bool nodata = true;
> - int r;
> + int capacity_len;
>
> device_table_data = dm_ima_alloc(DM_IMA_DEVICE_BUF_LEN*2, GFP_KERNEL,
> noio);
> if (!device_table_data)
> goto exit;
>
> - r = dm_ima_alloc_and_copy_capacity_str(md, &capacity_str, noio);
> - if (r) {
> + capacity_len = dm_ima_alloc_and_copy_capacity_str(md, &capacity_str,
> noio);
> + if (capacity_len < 0) {
> kfree(device_table_data);
> goto exit;
> }
> @@ -570,7 +565,6 @@ void dm_ima_measure_on_device_remove(struct mapped_device
> *md, bool remove_all)
> memcpy(device_table_data + l, remove_all ? "y;" : "n;", 2);
> l += 2;
>
> - capacity_len = strlen(capacity_str);
> memcpy(device_table_data + l, capacity_str, capacity_len);
> l += capacity_len;
>
> @@ -602,20 +596,20 @@ void dm_ima_measure_on_device_remove(struct
> mapped_device *md, bool remove_all)
> */
> void dm_ima_measure_on_table_clear(struct mapped_device *md, bool new_map)
> {
> - unsigned int l = 0, capacity_len = 0;
> + unsigned int l = 0;
> char *device_table_data = NULL, *dev_name = NULL, *dev_uuid = NULL,
> *capacity_str = NULL;
> char inactive_str[] = "inactive_table_hash=";
> unsigned int inactive_len = strlen(inactive_str);
> bool noio = true;
> bool nodata = true;
> - int r;
> + int capacity_len;
>
> device_table_data = dm_ima_alloc(DM_IMA_DEVICE_BUF_LEN, GFP_KERNEL,
> noio);
> if (!device_table_data)
> return;
>
> - r = dm_ima_alloc_and_copy_capacity_str(md, &capacity_str, noio);
> - if (r)
> + capacity_len = dm_ima_alloc_and_copy_capacity_str(md, &capacity_str,
> noio);
> + if (capacity_len < 0)
> goto error1;
>
> memcpy(device_table_data + l, DM_IMA_VERSION_STR,
> md->ima.dm_version_str_len);
> @@ -650,7 +644,6 @@ void dm_ima_measure_on_table_clear(struct mapped_device
> *md, bool new_map)
> DM_IMA_VERSION_STR, dev_name, dev_uuid);
> }
>
> - capacity_len = strlen(capacity_str);
> memcpy(device_table_data + l, capacity_str, capacity_len);
> l += capacity_len;
>
> @@ -703,7 +696,7 @@ void dm_ima_measure_on_device_rename(struct mapped_device
> *md)
> char *old_device_data = NULL, *new_device_data = NULL,
> *combined_device_data = NULL;
> char *new_dev_name = NULL, *new_dev_uuid = NULL, *capacity_str = NULL;
> bool noio = true;
> - int r, len;
> + int len;
>
> if (dm_ima_alloc_and_copy_device_data(md, &new_device_data,
> md->ima.active_table.num_targets,
> noio))
> @@ -716,8 +709,7 @@ void dm_ima_measure_on_device_rename(struct mapped_device
> *md)
> if (!combined_device_data)
> goto error;
>
> - r = dm_ima_alloc_and_copy_capacity_str(md, &capacity_str, noio);
> - if (r)
> + if (dm_ima_alloc_and_copy_capacity_str(md, &capacity_str, noio) < 0)
> goto error;
>
> old_device_data = md->ima.active_table.device_metadata;
> --
> 2.50.1
>
