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alistair23-linux
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Merge branch 'printk-rework' into for-linus

master
Petr Mladek 2021-02-22 13:43:55 +01:00
parent 2a8c3a6410 13791c80b0
commit 16182ac1f0
2 changed files with 19 additions and 11 deletions
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28
kernel/printk/printk.c
View File

@ -735,9 +735,9 @@ static ssize_t devkmsg_read(struct file *file, char __user *buf,
logbuf_lock_irq();
}
if (user->seq < prb_first_valid_seq(prb)) {
if (r->info->seq != user->seq) {
/* our last seen message is gone, return error and reset */
user->seq = prb_first_valid_seq(prb);
user->seq = r->info->seq;
ret = -EPIPE;
logbuf_unlock_irq();
goto out;
@ -812,6 +812,7 @@ static loff_t devkmsg_llseek(struct file *file, loff_t offset, int whence)
static __poll_t devkmsg_poll(struct file *file, poll_table *wait)
{
struct devkmsg_user *user = file->private_data;
struct printk_info info;
__poll_t ret = 0;
if (!user)
@ -820,9 +821,9 @@ static __poll_t devkmsg_poll(struct file *file, poll_table *wait)
poll_wait(file, &log_wait, wait);
logbuf_lock_irq();
if (prb_read_valid(prb, user->seq, NULL)) {
if (prb_read_valid_info(prb, user->seq, &info, NULL)) {
/* return error when data has vanished underneath us */
if (user->seq < prb_first_valid_seq(prb))
if (info.seq != user->seq)
ret = EPOLLIN|EPOLLRDNORM|EPOLLERR|EPOLLPRI;
else
ret = EPOLLIN|EPOLLRDNORM;
@ -1559,6 +1560,7 @@ static void syslog_clear(void)
int do_syslog(int type, char __user *buf, int len, int source)
{
struct printk_info info;
bool clear = false;
static int saved_console_loglevel = LOGLEVEL_DEFAULT;
int error;
@ -1629,9 +1631,14 @@ int do_syslog(int type, char __user *buf, int len, int source)
/* Number of chars in the log buffer */
case SYSLOG_ACTION_SIZE_UNREAD:
logbuf_lock_irq();
if (syslog_seq < prb_first_valid_seq(prb)) {
if (!prb_read_valid_info(prb, syslog_seq, &info, NULL)) {
/* No unread messages. */
logbuf_unlock_irq();
return 0;
}
if (info.seq != syslog_seq) {
/* messages are gone, move to first one */
syslog_seq = prb_first_valid_seq(prb);
syslog_seq = info.seq;
syslog_partial = 0;
}
if (source == SYSLOG_FROM_PROC) {
@ -1643,7 +1650,6 @@ int do_syslog(int type, char __user *buf, int len, int source)
error = prb_next_seq(prb) - syslog_seq;
} else {
bool time = syslog_partial ? syslog_time : printk_time;
struct printk_info info;
unsigned int line_count;
u64 seq;
@ -3429,9 +3435,11 @@ bool kmsg_dump_get_buffer(struct kmsg_dumper *dumper, bool syslog,
goto out;
logbuf_lock_irqsave(flags);
if (dumper->cur_seq < prb_first_valid_seq(prb)) {
/* messages are gone, move to first available one */
dumper->cur_seq = prb_first_valid_seq(prb);
if (prb_read_valid_info(prb, dumper->cur_seq, &info, NULL)) {
if (info.seq != dumper->cur_seq) {
/* messages are gone, move to first available one */
dumper->cur_seq = info.seq;
}
}
/* last entry */

2
kernel/printk/printk_ringbuffer.h
View File

@ -287,7 +287,7 @@ _DEFINE_PRINTKRB(name, descbits, avgtextbits, &_##name##_text[0])
/* Writer Interface */
/**
* prb_rec_init_wd() - Initialize a buffer for writing records.
* prb_rec_init_wr() - Initialize a buffer for writing records.
*
* @r: The record to initialize.
* @text_buf_size: The needed text buffer size.