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 --- fs/io-wq.c | 19 +++++++++++++++---- fs/io-wq.h | 4 +++- 2 files changed, 18 insertions(+), 5 deletions(-)

diff --git a/fs/io-wq.c b/fs/io-wq.c index cb60a42b9fdf..58b1891bcfe5 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 @@ -141,13 +143,17 @@ static bool __io_worker_unuse(struct io_wqe *wqe, struct io_worker *worker) worker->cur_creds = worker->saved_creds = NULL; }

- if (current->files != worker->restore_files) { + if ((current->files != worker->restore_files) || + (current->fs != worker->restore_fs)) { __acquire(&wqe->lock); spin_unlock_irq(&wqe->lock); dropped_lock = true;

task_lock(current); - current->files = worker->restore_files; + if (current->files != worker->restore_files) + current->files = worker->restore_files; + if (current->fs != worker->restore_fs) + current->fs = worker->restore_fs; task_unlock(current); }

@@ -311,6 +317,7 @@ 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); }

@@ -476,9 +483,13 @@ static void io_worker_handle_work(struct io_worker *worker) if (work->flags & IO_WQ_WORK_CB) work->func(&work);

- if (work->files && current->files != work->files) { + if ((work->files && current->files != work->files) || + (work->fs && current->fs != work->fs)) { task_lock(current); - current->files = work->files; + if (work->files && current->files != work->files) + current->files = work->files; + if (work->fs && current->fs != work->fs) + current->fs = work->fs; task_unlock(current); } if (work->mm != worker->mm) diff --git a/fs/io-wq.h b/fs/io-wq.h index 50b3378febf2..f152ba677d8f 100644 --- a/fs/io-wq.h +++ b/fs/io-wq.h @@ -74,6 +74,7 @@ struct io_wq_work { struct files_struct *files; struct mm_struct *mm; const struct cred *creds; + struct fs_struct *fs; unsigned flags; };

@@ -81,10 +82,11 @@ struct io_wq_work { do { \ (work)->list.next = NULL; \ (work)->func = _func; \ - (work)->flags = 0; \ (work)->files = NULL; \ (work)->mm = NULL; \ (work)->creds = NULL; \ + (work)->fs = NULL; \ + (work)->flags = 0; \ } while (0) \

typedef void (get_work_fn)(struct io_wq_work *);