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author | Miklos Szeredi <mszeredi@redhat.com> | 2018-07-26 17:13:11 +0300 |
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committer | Miklos Szeredi <mszeredi@redhat.com> | 2018-07-26 17:13:11 +0300 |
commit | b8f95e5d13f5f0191dcb4b9113113d241636e7cb (patch) | |
tree | 91bafee58d39bf8b75a6f6aa81ad553d5b389dcb /fs/fuse/dev.c | |
parent | 45ff350bbd9d0f0977ff270a0d427c71520c0c37 (diff) | |
download | linux-b8f95e5d13f5f0191dcb4b9113113d241636e7cb.tar.xz |
fuse: umount should wait for all requests
fuse_abort_conn() does not guarantee that all async requests have actually
finished aborting (i.e. their ->end() function is called). This could
actually result in still used inodes after umount.
Add a helper to wait until all requests are fully done. This is done by
looking at the "num_waiting" counter. When this counter drops to zero, we
can be sure that no more requests are outstanding.
Fixes: 0d8e84b0432b ("fuse: simplify request abort")
Cc: <stable@vger.kernel.org> # v4.2
Signed-off-by: Miklos Szeredi <mszeredi@redhat.com>
Diffstat (limited to 'fs/fuse/dev.c')
-rw-r--r-- | fs/fuse/dev.c | 23 |
1 files changed, 19 insertions, 4 deletions
diff --git a/fs/fuse/dev.c b/fs/fuse/dev.c index c8b197e4af9a..ec83b107c1a0 100644 --- a/fs/fuse/dev.c +++ b/fs/fuse/dev.c @@ -127,6 +127,16 @@ static bool fuse_block_alloc(struct fuse_conn *fc, bool for_background) return !fc->initialized || (for_background && fc->blocked); } +static void fuse_drop_waiting(struct fuse_conn *fc) +{ + if (fc->connected) { + atomic_dec(&fc->num_waiting); + } else if (atomic_dec_and_test(&fc->num_waiting)) { + /* wake up aborters */ + wake_up_all(&fc->blocked_waitq); + } +} + static struct fuse_req *__fuse_get_req(struct fuse_conn *fc, unsigned npages, bool for_background) { @@ -175,7 +185,7 @@ static struct fuse_req *__fuse_get_req(struct fuse_conn *fc, unsigned npages, return req; out: - atomic_dec(&fc->num_waiting); + fuse_drop_waiting(fc); return ERR_PTR(err); } @@ -285,7 +295,7 @@ void fuse_put_request(struct fuse_conn *fc, struct fuse_req *req) if (test_bit(FR_WAITING, &req->flags)) { __clear_bit(FR_WAITING, &req->flags); - atomic_dec(&fc->num_waiting); + fuse_drop_waiting(fc); } if (req->stolen_file) @@ -371,7 +381,7 @@ static void request_end(struct fuse_conn *fc, struct fuse_req *req) struct fuse_iqueue *fiq = &fc->iq; if (test_and_set_bit(FR_FINISHED, &req->flags)) - goto out_put_req; + goto put_request; spin_lock(&fiq->waitq.lock); list_del_init(&req->intr_entry); @@ -400,7 +410,7 @@ static void request_end(struct fuse_conn *fc, struct fuse_req *req) wake_up(&req->waitq); if (req->end) req->end(fc, req); -out_put_req: +put_request: fuse_put_request(fc, req); } @@ -2143,6 +2153,11 @@ void fuse_abort_conn(struct fuse_conn *fc, bool is_abort) } EXPORT_SYMBOL_GPL(fuse_abort_conn); +void fuse_wait_aborted(struct fuse_conn *fc) +{ + wait_event(fc->blocked_waitq, atomic_read(&fc->num_waiting) == 0); +} + int fuse_dev_release(struct inode *inode, struct file *file) { struct fuse_dev *fud = fuse_get_dev(file); |