[LTP] [PATCH v2] read_all: Fix buffer too small for long paths

[Michael Menasherov]

queue_pop() copies each path into popped[BUFFER_SIZE], but BUFFER_SIZE
was 1024 while visit_dir() builds paths up to MAX_PATH (4096). Any path
longer than 1023 bytes aborted the test with TBROK "Buffer is too small
for path".

Set BUFFER_SIZE and MAX_PATH to PATH_MAX so all path buffers and size
limits use the standard constant consistently.

Tested on smaller boards and then on local machines with deeply nested
directories under /sys; read_all_sys now passes instead of aborting.

Fixes: 67c95fbbfc3a ("Add read_all file systems test")
Signed-off-by: Michael Menasherov <mmenashe@redhat.com>
---
 testcases/kernel/fs/read_all/read_all.c | 4 ++--
 1 file changed, 2 insertions(+), 2 deletions(-)

diff --git a/testcases/kernel/fs/read_all/read_all.c b/testcases/kernel/fs/read_all/read_all.c
index 5720ffb99..bf5f613a3 100644
--- a/testcases/kernel/fs/read_all/read_all.c
+++ b/testcases/kernel/fs/read_all/read_all.c
@@ -51,8 +51,8 @@
 #include "tst_timer.h"
 
 #define QUEUE_SIZE 16384
-#define BUFFER_SIZE 1024
-#define MAX_PATH 4096
+#define BUFFER_SIZE PATH_MAX
+#define MAX_PATH PATH_MAX
 #define MAX_DISPLAY 40
 
 struct queue {
-- 
2.55.0