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bcachefs: bch2_print_string_as_lines()

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This adds a helper for printing a large buffer one line at a time, to
avoid the 1k printk limit.

Signed-off-by: Kent Overstreet <kent.overstreet@linux.dev>
This commit is contained in:
Kent Overstreet 2022-09-25 16:43:55 -04:00
parent e9174370d0
commit a8f3542843
3 changed files with 26 additions and 4 deletions
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7
fs/bcachefs/btree_iter.c
View File

@ -1334,7 +1334,7 @@ void bch2_dump_trans_updates(struct btree_trans *trans)
struct printbuf buf = PRINTBUF;
bch2_trans_updates_to_text(&buf, trans);
bch_err(trans->c, "%s", buf.buf);
bch2_print_string_as_lines(KERN_ERR, buf.buf);
printbuf_exit(&buf);
}
@ -1382,11 +1382,10 @@ void __bch2_dump_trans_paths_updates(struct btree_trans *trans, bool nosort)
struct printbuf buf = PRINTBUF;
__bch2_trans_paths_to_text(&buf, trans, nosort);
bch2_trans_updates_to_text(&buf, trans);
printk(KERN_ERR "%s", buf.buf);
bch2_print_string_as_lines(KERN_ERR, buf.buf);
printbuf_exit(&buf);
bch2_dump_trans_updates(trans);
}
noinline __cold

21
fs/bcachefs/util.c
View File

@ -8,6 +8,7 @@
#include <linux/bio.h>
#include <linux/blkdev.h>
#include <linux/console.h>
#include <linux/ctype.h>
#include <linux/debugfs.h>
#include <linux/freezer.h>
@ -244,6 +245,26 @@ void bch2_prt_u64_binary(struct printbuf *out, u64 v, unsigned nr_bits)
prt_char(out, '0' + ((v >> --nr_bits) & 1));
}
void bch2_print_string_as_lines(const char *prefix, const char *lines)
{
const char *p;
if (!lines) {
printk("%s (null)\n", prefix);
return;
}
console_lock();
while (1) {
p = strchrnul(lines, '\n');
printk("%s%.*s\n", prefix, (int) (p - lines), lines);
if (!*p)
break;
lines = p + 1;
}
console_unlock();
}
/* time stats: */
#ifndef CONFIG_BCACHEFS_NO_LATENCY_ACCT

2
fs/bcachefs/util.h
View File

@ -382,6 +382,8 @@ u64 bch2_read_flag_list(char *, const char * const[]);
void bch2_prt_u64_binary(struct printbuf *, u64, unsigned);
void bch2_print_string_as_lines(const char *prefix, const char *lines);
#define NR_QUANTILES 15
#define QUANTILE_IDX(i) inorder_to_eytzinger0(i, NR_QUANTILES)
#define QUANTILE_FIRST eytzinger0_first(NR_QUANTILES)