diff options
| -rw-r--r-- | fs/fuse/file.c | 14 |
1 files changed, 10 insertions, 4 deletions
diff --git a/fs/fuse/file.c b/fs/fuse/file.c index b3ad8d61a162..e570081f9f76 100644 --- a/fs/fuse/file.c +++ b/fs/fuse/file.c @@ -2373,6 +2373,11 @@ static void fuse_do_truncate(struct file *file) fuse_do_setattr(inode, &attr, file); } +static inline loff_t fuse_round_up(loff_t off) +{ + return round_up(off, FUSE_MAX_PAGES_PER_REQ << PAGE_SHIFT); +} + static ssize_t fuse_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov, loff_t offset, unsigned long nr_segs) @@ -2380,6 +2385,7 @@ fuse_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov, ssize_t ret = 0; struct file *file = iocb->ki_filp; struct fuse_file *ff = file->private_data; + bool async_dio = ff->fc->async_dio; loff_t pos = 0; struct inode *inode; loff_t i_size; @@ -2391,10 +2397,10 @@ fuse_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov, i_size = i_size_read(inode); /* optimization for short read */ - if (rw != WRITE && offset + count > i_size) { + if (async_dio && rw != WRITE && offset + count > i_size) { if (offset >= i_size) return 0; - count = i_size - offset; + count = min_t(loff_t, count, fuse_round_up(i_size - offset)); } io = kmalloc(sizeof(struct fuse_io_priv), GFP_KERNEL); @@ -2412,7 +2418,7 @@ fuse_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov, * By default, we want to optimize all I/Os with async request * submission to the client filesystem if supported. */ - io->async = ff->fc->async_dio; + io->async = async_dio; io->iocb = iocb; /* @@ -2420,7 +2426,7 @@ fuse_direct_IO(int rw, struct kiocb *iocb, const struct iovec *iov, * to wait on real async I/O requests, so we must submit this request * synchronously. */ - if (!is_sync_kiocb(iocb) && (offset + count > i_size)) + if (!is_sync_kiocb(iocb) && (offset + count > i_size) && rw == WRITE) io->async = false; if (rw == WRITE) |