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authorSteven Rostedt (Red Hat) <rostedt@goodmis.org>2014-10-29 13:48:37 -0400
committerSteven Rostedt <rostedt@goodmis.org>2014-11-19 22:01:10 -0500
commitdd23180aacf4b27d48f40b27249f1e58c8df03be (patch)
tree18b658af8993237ed6194dc5328de7d182df6a59
parent3a161d99c43ce74c76aecff309be4c3ba455e823 (diff)
tracing: Convert seq_buf_path() to be like seq_path()
Rewrite seq_buf_path() like it is done in seq_path() and allow it to accept any escape character instead of just "\n". Making seq_buf_path() like seq_path() will help prevent problems when converting seq_file to use the seq_buf logic. Link: http://lkml.kernel.org/r/20141104160222.048795666@goodmis.org Link: http://lkml.kernel.org/r/20141114011412.338523371@goodmis.org Tested-by: Jiri Kosina <jkosina@suse.cz> Acked-by: Jiri Kosina <jkosina@suse.cz> Reviewed-by: Petr Mladek <pmladek@suse.cz> Signed-off-by: Steven Rostedt <rostedt@goodmis.org>
-rw-r--r--include/linux/seq_buf.h2
-rw-r--r--kernel/trace/seq_buf.c28
-rw-r--r--kernel/trace/trace_seq.c5
3 files changed, 19 insertions, 16 deletions
diff --git a/include/linux/seq_buf.h b/include/linux/seq_buf.h
index 4f7a96a9d71a..38770688a627 100644
--- a/include/linux/seq_buf.h
+++ b/include/linux/seq_buf.h
@@ -73,7 +73,7 @@ extern int seq_buf_putc(struct seq_buf *s, unsigned char c);
extern int seq_buf_putmem(struct seq_buf *s, const void *mem, unsigned int len);
extern int seq_buf_putmem_hex(struct seq_buf *s, const void *mem,
unsigned int len);
-extern int seq_buf_path(struct seq_buf *s, const struct path *path);
+extern int seq_buf_path(struct seq_buf *s, const struct path *path, const char *esc);
extern int seq_buf_bitmask(struct seq_buf *s, const unsigned long *maskp,
int nmaskbits);
diff --git a/kernel/trace/seq_buf.c b/kernel/trace/seq_buf.c
index e9a7861595d2..7dac34d1235b 100644
--- a/kernel/trace/seq_buf.c
+++ b/kernel/trace/seq_buf.c
@@ -272,28 +272,32 @@ int seq_buf_putmem_hex(struct seq_buf *s, const void *mem,
* seq_buf_path - copy a path into the sequence buffer
* @s: seq_buf descriptor
* @path: path to write into the sequence buffer.
+ * @esc: set of characters to escape in the output
*
* Write a path name into the sequence buffer.
*
- * Returns zero on success, -1 on overflow
+ * Returns the number of written bytes on success, -1 on overflow
*/
-int seq_buf_path(struct seq_buf *s, const struct path *path)
+int seq_buf_path(struct seq_buf *s, const struct path *path, const char *esc)
{
- unsigned int len = seq_buf_buffer_left(s);
- unsigned char *p;
+ char *buf = s->buffer + s->len;
+ size_t size = seq_buf_buffer_left(s);
+ int res = -1;
WARN_ON(s->size == 0);
- p = d_path(path, s->buffer + s->len, len);
- if (!IS_ERR(p)) {
- p = mangle_path(s->buffer + s->len, p, "\n");
- if (p) {
- s->len = p - s->buffer;
- return 0;
+ if (size) {
+ char *p = d_path(path, buf, size);
+ if (!IS_ERR(p)) {
+ char *end = mangle_path(buf, p, esc);
+ if (end)
+ res = end - buf;
}
}
- seq_buf_set_overflow(s);
- return -1;
+ if (res > 0)
+ s->len += res;
+
+ return res;
}
/**
diff --git a/kernel/trace/trace_seq.c b/kernel/trace/trace_seq.c
index 8c0c54fe674b..74cacc930c24 100644
--- a/kernel/trace/trace_seq.c
+++ b/kernel/trace/trace_seq.c
@@ -326,7 +326,6 @@ EXPORT_SYMBOL_GPL(trace_seq_putmem_hex);
int trace_seq_path(struct trace_seq *s, const struct path *path)
{
unsigned int save_len = s->seq.len;
- int ret;
if (s->full)
return 0;
@@ -338,7 +337,7 @@ int trace_seq_path(struct trace_seq *s, const struct path *path)
return 0;
}
- ret = seq_buf_path(&s->seq, path);
+ seq_buf_path(&s->seq, path, "\n");
if (unlikely(seq_buf_has_overflowed(&s->seq))) {
s->seq.len = save_len;
@@ -346,7 +345,7 @@ int trace_seq_path(struct trace_seq *s, const struct path *path)
return 0;
}
- return ret;
+ return 1;
}
EXPORT_SYMBOL_GPL(trace_seq_path);