diff mbox series

[v3,4/4] eal: cache last directory permissions checked

Message ID 20200703102332.1101232-5-bruce.richardson@intel.com (mailing list archive)
State Accepted, archived
Headers
Series improve runtime loading of shared drivers |

Checks

Context Check Description
ci/checkpatch success coding style OK
ci/Intel-compilation fail apply issues

Commit Message

Bruce Richardson July 3, 2020, 10:23 a.m. UTC 
  When loading a directory of drivers, we check the same hierarchy multiple
times. If we just cache the last directory checked, this avoids repeated
checks of the same path, since all drivers in that path have been added to
the list consecutively.

Signed-off-by: Bruce Richardson <bruce.richardson@intel.com>
---
 lib/librte_eal/common/eal_common_options.c | 10 ++++++++--
 1 file changed, 8 insertions(+), 2 deletions(-)
diff mbox series

Patch

diff --git a/lib/librte_eal/common/eal_common_options.c b/lib/librte_eal/common/eal_common_options.c
index 6c63b9364..85d5ba723 100644
--- a/lib/librte_eal/common/eal_common_options.c
+++ b/lib/librte_eal/common/eal_common_options.c
@@ -414,11 +414,17 @@  verify_perms(const char *dirpath)
 
 	/* if not root, check down one level first */
 	if (strcmp(dirpath, "/") != 0) {
+		static __thread char last_dir_checked[PATH_MAX];
 		char copy[PATH_MAX];
+		const char *dir;
 
 		strlcpy(copy, dirpath, PATH_MAX);
-		if (verify_perms(dirname(copy)) != 0)
-			return -1;
+		dir = dirname(copy);
+		if (strncmp(dir, last_dir_checked, PATH_MAX) != 0) {
+			if (verify_perms(dir) != 0)
+				return -1;
+			strlcpy(last_dir_checked, dir, PATH_MAX);
+		}
 	}
 
 	/* call stat to check for permissions and ensure not world writable */