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tracing: Add full state to trace_seq

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The trace_seq buffer might fill up, and right now one needs to check the
return value of each printf into the buffer to check for that.

Instead, have the buffer keep track of whether it is full or not, and
reject more input if it is full or would have overflowed with an input
that wasn't added.

Cc: Lai Jiangshan <laijs@cn.fujitsu.com>
Signed-off-by: Johannes Berg <johannes@sipsolutions.net>
Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
This commit is contained in:
Johannes Berg 2009-11-25 16:10:14 +01:00 committed by Steven Rostedt
parent a63ce5b306
commit d184b31c0e
2 changed files with 52 additions and 11 deletions
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2
include/linux/trace_seq.h
View file

@ -14,6 +14,7 @@ struct trace_seq {
unsigned char buffer[PAGE_SIZE];
unsigned int len;
unsigned int readpos;
int full;
};
static inline void
@ -21,6 +22,7 @@ trace_seq_init(struct trace_seq *s)
{
s->len = 0;
s->readpos = 0;
s->full = 0;
}
/*

61
kernel/trace/trace_output.c
View file

@ -93,7 +93,7 @@ trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
va_list ap;
int ret;
if (!len)
if (s->full || !len)
return 0;
va_start(ap, fmt);
@ -101,8 +101,10 @@ trace_seq_printf(struct trace_seq *s, const char *fmt, ...)
va_end(ap);
/* If we can't write it all, don't bother writing anything */
if (ret >= len)
if (ret >= len) {
s->full = 1;
return 0;
}
s->len += ret;
@ -127,14 +129,16 @@ trace_seq_vprintf(struct trace_seq *s, const char *fmt, va_list args)
int len = (PAGE_SIZE - 1) - s->len;
int ret;
if (!len)
if (s->full || !len)
return 0;
ret = vsnprintf(s->buffer + s->len, len, fmt, args);
/* If we can't write it all, don't bother writing anything */
if (ret >= len)
if (ret >= len) {
s->full = 1;
return 0;
}
s->len += ret;
@ -147,14 +151,16 @@ int trace_seq_bprintf(struct trace_seq *s, const char *fmt, const u32 *binary)
int len = (PAGE_SIZE - 1) - s->len;
int ret;
if (!len)
if (s->full || !len)
return 0;
ret = bstr_printf(s->buffer + s->len, len, fmt, binary);
/* If we can't write it all, don't bother writing anything */
if (ret >= len)
if (ret >= len) {
s->full = 1;
return 0;
}
s->len += ret;
@ -175,9 +181,14 @@ int trace_seq_puts(struct trace_seq *s, const char *str)
{
int len = strlen(str);
if (len > ((PAGE_SIZE - 1) - s->len))
if (s->full)
return 0;
if (len > ((PAGE_SIZE - 1) - s->len)) {
s->full = 1;
return 0;
}
memcpy(s->buffer + s->len, str, len);
s->len += len;
@ -186,9 +197,14 @@ int trace_seq_puts(struct trace_seq *s, const char *str)
int trace_seq_putc(struct trace_seq *s, unsigned char c)
{
if (s->len >= (PAGE_SIZE - 1))
if (s->full)
return 0;
if (s->len >= (PAGE_SIZE - 1)) {
s->full = 1;
return 0;
}
s->buffer[s->len++] = c;
return 1;
@ -196,9 +212,14 @@ int trace_seq_putc(struct trace_seq *s, unsigned char c)
int trace_seq_putmem(struct trace_seq *s, const void *mem, size_t len)
{
if (len > ((PAGE_SIZE - 1) - s->len))
if (s->full)
return 0;
if (len > ((PAGE_SIZE - 1) - s->len)) {
s->full = 1;
return 0;
}
memcpy(s->buffer + s->len, mem, len);
s->len += len;
@ -211,6 +232,9 @@ int trace_seq_putmem_hex(struct trace_seq *s, const void *mem, size_t len)
const unsigned char *data = mem;
int i, j;
if (s->full)
return 0;
#ifdef __BIG_ENDIAN
for (i = 0, j = 0; i < len; i++) {
#else
@ -228,8 +252,13 @@ void *trace_seq_reserve(struct trace_seq *s, size_t len)
{
void *ret;
if (len > ((PAGE_SIZE - 1) - s->len))
if (s->full)
return 0;
if (len > ((PAGE_SIZE - 1) - s->len)) {
s->full = 1;
return NULL;
}
ret = s->buffer + s->len;
s->len += len;
@ -241,8 +270,14 @@ int trace_seq_path(struct trace_seq *s, struct path *path)
{
unsigned char *p;
if (s->len >= (PAGE_SIZE - 1))
if (s->full)
return 0;
if (s->len >= (PAGE_SIZE - 1)) {
s->full = 1;
return 0;
}
p = d_path(path, s->buffer + s->len, PAGE_SIZE - s->len);
if (!IS_ERR(p)) {
p = mangle_path(s->buffer + s->len, p, "\n");
@ -255,6 +290,7 @@ int trace_seq_path(struct trace_seq *s, struct path *path)
return 1;
}
s->full = 1;
return 0;
}
@ -381,6 +417,9 @@ int seq_print_user_ip(struct trace_seq *s, struct mm_struct *mm,
unsigned long vmstart = 0;
int ret = 1;
if (s->full)
return 0;
if (mm) {
const struct vm_area_struct *vma;