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authorJens Axboe <axboe@kernel.dk>2020-02-06 21:42:51 -0700
committerJens Axboe <axboe@kernel.dk>2020-02-08 13:06:58 -0700
commit9392a27d88b9707145d713654eb26f0c29789e50 (patch)
treee40fe1aefd634c29f41cfcc103e32f4a68c38cd3 /fs/io-wq.c
parentfaac996ccd5da95bc56b91aa80f2643c2d0a1c56 (diff)
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io-wq: add support for inheriting ->fs
Some work items need this for relative path lookup, make it available like the other inherited credentials/mm/etc. Cc: stable@vger.kernel.org # 5.3+ Signed-off-by: Jens Axboe <axboe@kernel.dk>
Diffstat (limited to 'fs/io-wq.c')
-rw-r--r--fs/io-wq.c8
1 files changed, 8 insertions, 0 deletions
diff --git a/fs/io-wq.c b/fs/io-wq.c
index cb60a42b9fdf..7ac4a8876a50 100644
--- a/fs/io-wq.c
+++ b/fs/io-wq.c
@@ -16,6 +16,7 @@
#include <linux/slab.h>
#include <linux/kthread.h>
#include <linux/rculist_nulls.h>
+#include <linux/fs_struct.h>
#include "io-wq.h"
@@ -59,6 +60,7 @@ struct io_worker {
const struct cred *cur_creds;
const struct cred *saved_creds;
struct files_struct *restore_files;
+ struct fs_struct *restore_fs;
};
#if BITS_PER_LONG == 64
@@ -151,6 +153,9 @@ static bool __io_worker_unuse(struct io_wqe *wqe, struct io_worker *worker)
task_unlock(current);
}
+ if (current->fs != worker->restore_fs)
+ current->fs = worker->restore_fs;
+
/*
* If we have an active mm, we need to drop the wq lock before unusing
* it. If we do, return true and let the caller retry the idle loop.
@@ -311,6 +316,7 @@ static void io_worker_start(struct io_wqe *wqe, struct io_worker *worker)
worker->flags |= (IO_WORKER_F_UP | IO_WORKER_F_RUNNING);
worker->restore_files = current->files;
+ worker->restore_fs = current->fs;
io_wqe_inc_running(wqe, worker);
}
@@ -481,6 +487,8 @@ next:
current->files = work->files;
task_unlock(current);
}
+ if (work->fs && current->fs != work->fs)
+ current->fs = work->fs;
if (work->mm != worker->mm)
io_wq_switch_mm(worker, work);
if (worker->cur_creds != work->creds)