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io_uring-6.16-20250630

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Merge tag 'io_uring-6.16-20250630' of git://git.kernel.dk/linux

Pull io_uring fix from Jens Axboe:
 "Now that anonymous inodes set S_IFREG, this breaks the io_uring
  read/write retries for short reads/writes. As things like timerfd and
  eventfd are anon inodes, applications that previously did:

    unsigned long event_data[2];

    io_uring_prep_read(sqe, evfd, event_data, sizeof(event_data), 0);

  and just got a short read when 1 event was posted, will now wait for
  the full amount before posting a completion.

  This caused issues for the ghostty application, making it basically
  unusable due to excessive buffering"

* tag 'io_uring-6.16-20250630' of git://git.kernel.dk/linux:
  io_uring: gate REQ_F_ISREG on !S_ANON_INODE as well
This commit is contained in:
Linus Torvalds 2025-06-30 16:32:43 -07:00
commit 66701750d5
1 changed files with 2 additions and 1 deletions
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3
io_uring/io_uring.c
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@ -1666,11 +1666,12 @@ static void io_iopoll_req_issued(struct io_kiocb *req, unsigned int issue_flags)
io_req_flags_t io_file_get_flags(struct file *file)
{
struct inode *inode = file_inode(file);
io_req_flags_t res = 0;
BUILD_BUG_ON(REQ_F_ISREG_BIT != REQ_F_SUPPORT_NOWAIT_BIT + 1);
if (S_ISREG(file_inode(file)->i_mode))
if (S_ISREG(inode->i_mode) && !(inode->i_flags & S_ANON_INODE))
res |= REQ_F_ISREG;
if ((file->f_flags & O_NONBLOCK) || (file->f_mode & FMODE_NOWAIT))
res |= REQ_F_SUPPORT_NOWAIT;