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c2d466b9fe
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 <andriy.shevchenko@linux.intel.com>
Cc: Josh Law <objecting@objecting.org>
Signed-off-by: Kees Cook <kees@kernel.org>
Reviewed-by: Josh Law <objecting@objecting.org>
Link: https://patch.msgid.link/20260321004840.work.670-kees@kernel.org
Signed-off-by: Jens Axboe <axboe@kernel.dk>
69 lines
2.1 KiB
C
69 lines
2.1 KiB
C
/* SPDX-License-Identifier: GPL-2.0 */
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#include <linux/pagemap.h>
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#include <linux/blkdev.h>
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#include <linux/seq_buf.h>
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#include "../blk.h"
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/*
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* add_gd_partition adds a partitions details to the devices partition
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* description.
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*/
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struct parsed_partitions {
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struct gendisk *disk;
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char name[BDEVNAME_SIZE];
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struct {
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sector_t from;
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sector_t size;
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int flags;
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bool has_info;
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struct partition_meta_info info;
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} *parts;
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int next;
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int limit;
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bool access_beyond_eod;
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struct seq_buf pp_buf;
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};
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typedef struct {
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struct folio *v;
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} Sector;
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void *read_part_sector(struct parsed_partitions *state, sector_t n, Sector *p);
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static inline void put_dev_sector(Sector p)
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{
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folio_put(p.v);
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}
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static inline void
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put_partition(struct parsed_partitions *p, int n, sector_t from, sector_t size)
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{
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if (n < p->limit) {
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p->parts[n].from = from;
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p->parts[n].size = size;
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seq_buf_printf(&p->pp_buf, " %s%d", p->name, n);
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}
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}
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/* detection routines go here in alphabetical order: */
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int adfspart_check_ADFS(struct parsed_partitions *state);
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int adfspart_check_CUMANA(struct parsed_partitions *state);
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int adfspart_check_EESOX(struct parsed_partitions *state);
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int adfspart_check_ICS(struct parsed_partitions *state);
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int adfspart_check_POWERTEC(struct parsed_partitions *state);
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int aix_partition(struct parsed_partitions *state);
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int amiga_partition(struct parsed_partitions *state);
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int atari_partition(struct parsed_partitions *state);
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int cmdline_partition(struct parsed_partitions *state);
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int efi_partition(struct parsed_partitions *state);
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int ibm_partition(struct parsed_partitions *);
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int karma_partition(struct parsed_partitions *state);
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int ldm_partition(struct parsed_partitions *state);
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int mac_partition(struct parsed_partitions *state);
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int msdos_partition(struct parsed_partitions *state);
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int of_partition(struct parsed_partitions *state);
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int osf_partition(struct parsed_partitions *state);
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int sgi_partition(struct parsed_partitions *state);
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int sun_partition(struct parsed_partitions *state);
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int sysv68_partition(struct parsed_partitions *state);
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int ultrix_partition(struct parsed_partitions *state);
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