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authorAlexey Dobriyan <adobriyan@gmail.com>2018-08-22 07:54:23 +0300
committerLinus Torvalds <torvalds@linux-foundation.org>2018-08-22 20:52:45 +0300
commit8d48b2e044218ba8b3f6b1d34e96a7474b6b0688 (patch)
treeb649d72c3703bdfa6cc1b0bbedbf861c1476786f /fs/proc/generic.c
parent2cd36fb329487e9525db3ccdbac1e92053b646fa (diff)
downloadlinux-8d48b2e044218ba8b3f6b1d34e96a7474b6b0688.tar.xz
proc: smaller readlock section in readdir("/proc")
Readdir context is thread local, so ->pos is thread local, move it out of readlock. Link: http://lkml.kernel.org/r/20180627195339.GD18113@avx2 Signed-off-by: Alexey Dobriyan <adobriyan@gmail.com> Reviewed-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Andrew Morton <akpm@linux-foundation.org> Signed-off-by: Linus Torvalds <torvalds@linux-foundation.org>
Diffstat (limited to 'fs/proc/generic.c')
-rw-r--r--fs/proc/generic.c4
1 files changed, 2 insertions, 2 deletions
diff --git a/fs/proc/generic.c b/fs/proc/generic.c
index bb1c1625b158..8ae109429a88 100644
--- 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;