| Message ID | 20240914085131.3871317-1-yangyun50@huawei.com (mailing list archive) |
|---|---|
| State | New |
| Headers | show |
| Series | fuse: use exclusive lock when FUSE_I_CACHE_IO_MODE is set | expand |
On 9/14/24 10:51, yangyun wrote: > This may be a typo. The comment has said shared locks are > not allowed when this bit is set. If using shared lock, the > wait in `fuse_file_cached_io_open` may be forever. > > Fixes: 205c1d802683 ("fuse: allow parallel dio writes with FUSE_DIRECT_IO_ALLOW_MMAP") > CC: stable@vger.kernel.org > Signed-off-by: yangyun <yangyun50@huawei.com> > --- > fs/fuse/file.c | 2 +- > 1 file changed, 1 insertion(+), 1 deletion(-) > > diff --git a/fs/fuse/file.c b/fs/fuse/file.c > index ca553d7a7c9e..e5f6affb0baa 100644 > --- a/fs/fuse/file.c > +++ b/fs/fuse/file.c > @@ -1345,7 +1345,7 @@ static bool fuse_dio_wr_exclusive_lock(struct kiocb *iocb, struct iov_iter *from > > /* shared locks are not allowed with parallel page cache IO */ > if (test_bit(FUSE_I_CACHE_IO_MODE, &fi->state)) > - return false; > + return true; > > /* Parallel dio beyond EOF is not supported, at least for now. */ > if (fuse_io_past_eof(iocb, from)) Oh, another of these, maybe I should have named this function 'fuse_dio_deny_wr_shared_lock'. The good part is that it will be later on caught in fuse_dio_lock/fuse_inode_uncached_io_start and then switch to an exclusive lock. I.e. testing did not reveal it. Reviewed-by: Bernd Schubert <bschubert@ddn.com>
diff --git a/fs/fuse/file.c b/fs/fuse/file.c index ca553d7a7c9e..e5f6affb0baa 100644 --- a/fs/fuse/file.c +++ b/fs/fuse/file.c @@ -1345,7 +1345,7 @@ static bool fuse_dio_wr_exclusive_lock(struct kiocb *iocb, struct iov_iter *from /* shared locks are not allowed with parallel page cache IO */ if (test_bit(FUSE_I_CACHE_IO_MODE, &fi->state)) - return false; + return true; /* Parallel dio beyond EOF is not supported, at least for now. */ if (fuse_io_past_eof(iocb, from))
This may be a typo. The comment has said shared locks are not allowed when this bit is set. If using shared lock, the wait in `fuse_file_cached_io_open` may be forever. Fixes: 205c1d802683 ("fuse: allow parallel dio writes with FUSE_DIRECT_IO_ALLOW_MMAP") CC: stable@vger.kernel.org Signed-off-by: yangyun <yangyun50@huawei.com> --- fs/fuse/file.c | 2 +- 1 file changed, 1 insertion(+), 1 deletion(-)