From: Alexey Dobriyan <adobriyan@gmail.com>
To: akpm@linux-foundation.org
Cc: linux-kernel@vger.kernel.org
Subject: [PATCH] proc: smaller readlock section in readdir("/proc")
Date: Wed, 27 Jun 2018 22:53:39 +0300 [thread overview]
Message-ID: <20180627195339.GD18113@avx2> (raw)
Readdir context is thread local, so ->pos is thread local,
move it out of readlock.
Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com>
---
fs/proc/generic.c | 4 ++--
1 file changed, 2 insertions(+), 2 deletions(-)
--- a/fs/proc/generic.c
+++ b/fs/proc/generic.c
@@ -286,9 +286,9 @@ int proc_readdir_de(struct file *file, struct dir_context *ctx,
if (!dir_emit_dots(file, ctx))
return 0;
+ i = ctx->pos - 2;
read_lock(&proc_subdir_lock);
de = pde_subdir_first(de);
- i = ctx->pos - 2;
for (;;) {
if (!de) {
read_unlock(&proc_subdir_lock);
@@ -309,8 +309,8 @@ int proc_readdir_de(struct file *file, struct dir_context *ctx,
pde_put(de);
return 0;
}
- read_lock(&proc_subdir_lock);
ctx->pos++;
+ read_lock(&proc_subdir_lock);
next = pde_subdir_next(de);
pde_put(de);
de = next;
reply other threads:[~2018-06-27 19:53 UTC|newest]
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