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Subject[PATCH 00/21] TTY buffer in tty_port and other stuff

this is the fifth series of patches which finally move tty buffers
from tty_struct (present from open to close/hangup) to tty_port
(present as long as the device). This allows us to get rid of the tty
refcounting in the interrupt service routines and other hot paths
after we are done. This is because we do not need to handle races
among ISRs, timers, hangups and others, because tty_port lives as long
as an interrupt/timer tick may occur. Unlike tty_struct.

This set also cleans up devpts handling a bit. Devpts used to play
with tty->driver_data which was a bit ugly. Now devpts returns a node
which we store to driver_data and pass it back when we need devpts to
kill that. As a result, we can do that in the pty code instead of an
ugly hook in tty_release.

Finally, the set moves all the n_tty private stuff from tty_struct to
its own (internal) structure. This was an intention last time ago (at
least here), but the races and undefined ldisc->open/close behavior
did not allow us to do that. Now that we have ldisc kills and waits
and bells and whistles we could finally go ahead.

As usual, standard x86 stuff was runtime-tested. The rest is only
checked to be compilation-errors free.

Jiri Slaby (21):
TTY: devpts, don't care about TTY in devpts_get_tty
TTY: devpts, return created inode from devpts_pty_new
TTY: devpts, do not set driver_data
TTY: devpts, document devpts inode operations
TTY: move devpts kill to pty
TTY: vt, fix paste_selection ldisc handling
TTY: ldisc, wait for idle ldisc in release
TTY: hci_ldisc, remove invalid check in open
TTY: n_tty, simplify read_buf+echo_buf allocation
TTY: n_tty, remove bogus checks
TTY: audit, stop accessing tty->icount
TTY: n_tty, add ldisc data to n_tty
TTY: move ldisc data from tty_struct: simple members
TTY: move ldisc data from tty_struct: bitmaps
TTY: move ldisc data from tty_struct: read_* and echo_* and canon_*
TTY: move ldisc data from tty_struct: locks
TTY: n_tty, propagate n_tty_data
TTY: move TTY_FLUSH* flags to tty_port
TTY: tty_buffer, cache pointer to tty->buf
TTY: add port -> tty link
TTY: move tty buffers to tty_port

drivers/bluetooth/hci_ldisc.c | 7 +-
drivers/tty/n_tty.c | 752 ++++++++++++++++++++++--------------------
drivers/tty/pty.c | 30 +-
drivers/tty/tty_audit.c | 15 +-
drivers/tty/tty_buffer.c | 224 +++++++------
drivers/tty/tty_io.c | 15 +-
drivers/tty/tty_ldisc.c | 15 +-
drivers/tty/tty_port.c | 2 +
drivers/tty/vt/selection.c | 9 +-
fs/devpts/inode.c | 61 ++--
include/linux/devpts_fs.h | 20 +-
include/linux/tty.h | 44 +--
include/linux/tty_flip.h | 2 +-
13 files changed, 633 insertions(+), 563 deletions(-)


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