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io_uring-6.12-20241101

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Merge tag 'io_uring-6.12-20241101' of git://git.kernel.dk/linux

Pull io_uring fix from Jens Axboe:

 - Fix not honoring IOCB_NOWAIT for starting buffered writes in terms of
   calling sb_start_write(), leading to a deadlock if someone is
   attempting to freeze the file system with writes in progress, as each
   side will end up waiting for the other to make progress.

* tag 'io_uring-6.12-20241101' of git://git.kernel.dk/linux:
  io_uring/rw: fix missing NOWAIT check for O_DIRECT start write
This commit is contained in:
Linus Torvalds 2024-11-01 13:38:01 -10:00
commit f0d3699aef
1 changed files with 21 additions and 2 deletions
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23
io_uring/rw.c
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@ -1014,6 +1014,25 @@ int io_read_mshot(struct io_kiocb *req, unsigned int issue_flags)
return IOU_OK;
}
static bool io_kiocb_start_write(struct io_kiocb *req, struct kiocb *kiocb)
{
struct inode *inode;
bool ret;
if (!(req->flags & REQ_F_ISREG))
return true;
if (!(kiocb->ki_flags & IOCB_NOWAIT)) {
kiocb_start_write(kiocb);
return true;
}
inode = file_inode(kiocb->ki_filp);
ret = sb_start_write_trylock(inode->i_sb);
if (ret)
__sb_writers_release(inode->i_sb, SB_FREEZE_WRITE);
return ret;
}
int io_write(struct io_kiocb *req, unsigned int issue_flags)
{
bool force_nonblock = issue_flags & IO_URING_F_NONBLOCK;
@ -1051,8 +1070,8 @@ int io_write(struct io_kiocb *req, unsigned int issue_flags)
if (unlikely(ret))
return ret;
if (req->flags & REQ_F_ISREG)
kiocb_start_write(kiocb);
if (unlikely(!io_kiocb_start_write(req, kiocb)))
return -EAGAIN;
kiocb->ki_flags |= IOCB_WRITE;
if (likely(req->file->f_op->write_iter))