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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>
61 lines
1.1 KiB
C
61 lines
1.1 KiB
C
// SPDX-License-Identifier: GPL-2.0
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/*
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* fs/partitions/karma.c
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* Rio Karma partition info.
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*
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* Copyright (C) 2006 Bob Copeland (me@bobcopeland.com)
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* based on osf.c
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*/
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#include "check.h"
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#include <linux/compiler.h>
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#define KARMA_LABEL_MAGIC 0xAB56
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int karma_partition(struct parsed_partitions *state)
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{
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int i;
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int slot = 1;
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Sector sect;
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unsigned char *data;
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struct disklabel {
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u8 d_reserved[270];
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struct d_partition {
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__le32 p_res;
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u8 p_fstype;
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u8 p_res2[3];
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__le32 p_offset;
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__le32 p_size;
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} d_partitions[2];
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u8 d_blank[208];
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__le16 d_magic;
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} __packed *label;
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struct d_partition *p;
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data = read_part_sector(state, 0, §);
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if (!data)
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return -1;
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label = (struct disklabel *)data;
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if (le16_to_cpu(label->d_magic) != KARMA_LABEL_MAGIC) {
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put_dev_sector(sect);
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return 0;
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}
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p = label->d_partitions;
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for (i = 0 ; i < 2; i++, p++) {
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if (slot == state->limit)
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break;
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if (p->p_fstype == 0x4d && le32_to_cpu(p->p_size)) {
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put_partition(state, slot, le32_to_cpu(p->p_offset),
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le32_to_cpu(p->p_size));
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}
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slot++;
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}
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seq_buf_puts(&state->pp_buf, "\n");
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put_dev_sector(sect);
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return 1;
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}
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