kernel/linux.git/block/partitions/ibm.c, branch linux-7.1.y

block: partitions: Replace pp_buf with struct seq_buf

2026-03-21T14:27:08+00:00

In preparation for removing the strlcat API[1], replace the char *pp_buf with a struct seq_buf, which tracks the current write position and remaining space internally. This allows for: - Direct use of seq_buf_printf() in place of snprintf()+strlcat() pairs, eliminating local tmp buffers throughout. - Adjacent strlcat() calls that build strings piece-by-piece (e.g., strlcat("["); strlcat(name); strlcat("]")) to be collapsed into single seq_buf_printf() calls. - Simpler call sites: seq_buf_puts() takes only the buffer and string, with no need to pass PAGE_SIZE at every call. The backing buffer allocation is unchanged (__get_free_page), and the output path uses seq_buf_str() to NUL-terminate before passing to printk(). Link: https://github.com/KSPP/linux/issues/370 [1] Cc: Andy Shevchenko Cc: Josh Law Signed-off-by: Kees Cook Reviewed-by: Josh Law Link: https://patch.msgid.link/20260321004840.work.670-kees@kernel.org Signed-off-by: Jens Axboe

Convert 'alloc_obj' family to use the new default GFP_KERNEL argument

2026-02-22T01:09:51+00:00

This was done entirely with mindless brute force, using git grep -l '\

treewide: Replace kmalloc with kmalloc_obj for non-scalar types

2026-02-21T09:02:28+00:00

This is the result of running the Coccinelle script from scripts/coccinelle/api/kmalloc_objs.cocci. The script is designed to avoid scalar types (which need careful case-by-case checking), and instead replace kmalloc-family calls that allocate struct or union object instances: Single allocations: kmalloc(sizeof(TYPE), ...) are replaced with: kmalloc_obj(TYPE, ...) Array allocations: kmalloc_array(COUNT, sizeof(TYPE), ...) are replaced with: kmalloc_objs(TYPE, COUNT, ...) Flex array allocations: kmalloc(struct_size(PTR, FAM, COUNT), ...) are replaced with: kmalloc_flex(*PTR, FAM, COUNT, ...) (where TYPE may also be *VAR) The resulting allocations no longer return "void *", instead returning "TYPE *". Signed-off-by: Kees Cook

block: switch ->getgeo() to struct gendisk

2025-08-13T06:59:29+00:00

Instances are happier that way and it makes more sense anyway - the only part of the result that is related to partition we are given is the start sector, and that has been filled in by the caller. Everything else is a function of the disk. Only one instance (DASD) is ever looking at anything other than bdev->bd_disk and that one is trivial to adjust. Reviewed-by: Martin K. Petersen Reviewed-by: Christoph Hellwig Acked-by: Jens Axboe Signed-off-by: Al Viro

partitions/ibm: Introduce defines for magic string length values

2023-10-04T14:04:08+00:00

The length values for volume label type and volume label id are hard-coded in several places. Provide defines for those values and replace all occurrences accordingly. Note that the length is defined and used, and not the size since the volume label type string and volume label id string are not nul-terminated. Signed-off-by: Jan Höppner Reviewed-by: Stefan Haberland Signed-off-by: Stefan Haberland Link: https://lore.kernel.org/r/20230915131001.697070-4-sth@linux.ibm.com Signed-off-by: Jens Axboe

partitions/ibm: Replace strncpy() and improve readability

2023-10-04T14:04:08+00:00

strncpy() is deprecated and needs to be replaced. The volume label information strings are not nul-terminated and strncpy() can simply be replaced with memcpy(). To enhance the readability of find_label() alongside this change, the following improvements are made: - Introduce the array dasd_vollabels[] containing all information necessary for the label detection. - Provide a helper function to obtain an index value corresponding to a volume label type. This allows the use of a switch statement to reduce indentation levels. - The 'temp' variable is used to check against valid volume label types. In the good case, this variable already contains the volume label type making it unnecessary to copy the information again from e.g. label->vol.vollbl. Remove the 'temp' variable and the second copy as all information are already provided. - Remove the 'found' variable and replace it with early returns Signed-off-by: Jan Höppner Reviewed-by: Stefan Haberland Signed-off-by: Stefan Haberland Link: https://lore.kernel.org/r/20230915131001.697070-3-sth@linux.ibm.com Signed-off-by: Jens Axboe

partitions/ibm: Remove unnecessary memset

2023-10-04T14:04:08+00:00

The data holding the volume label information is zeroed in case no valid volume label was found. Since the label information isn't used in that case, zeroing the data doesn't provide any value whatsoever. Remove the unnecessary memset() call accordingly. Signed-off-by: Jan Höppner Reviewed-by: Stefan Haberland Signed-off-by: Stefan Haberland Link: https://lore.kernel.org/r/20230915131001.697070-2-sth@linux.ibm.com Signed-off-by: Jens Axboe

partitions/ibm: use bdev_nr_sectors instead of open coding it

2021-10-19T12:17:33+00:00

Use the proper helper to read the block device size and switch various places to pass the size in terms of sectors which is more practical. Signed-off-by: Christoph Hellwig Link: https://lore.kernel.org/r/20211019062024.2171074-4-hch@lst.de [axboe: fix comment typo] Signed-off-by: Jens Axboe

block: store a gendisk in struct parsed_partitions

2021-08-12T16:31:35+00:00

Partition scanning only happens on the whole device, so pass a struct gendisk instead of the whole device block_device to the scanners. This allows to simplify printing the device name in various places as the disk name is available in disk->name. Signed-off-by: Christoph Hellwig Reviewed-by: Stefan Haberland Link: https://lore.kernel.org/r/20210810154512.1809898-2-hch@lst.de Signed-off-by: Jens Axboe

partitions/ibm: fix non-DASD devices

2020-10-07T13:55:35+00:00

Don't error out if the dasd_biodasdinfo symbol is not available. Cc: stable@vger.kernel.org Fixes: 26d7e28e3820 ("s390/dasd: remove ioctl_by_bdev calls") Reported-by: Christian Borntraeger Signed-off-by: Christoph Hellwig Tested-by: Christian Borntraeger Reviewed-by: Stefan Haberland Signed-off-by: Jens Axboe