mirror of
https://github.com/AuxXxilium/linux_dsm_epyc7002.git
synced 2024-12-06 17:26:39 +07:00
6038f373a3
All file_operations should get a .llseek operation so we can make nonseekable_open the default for future file operations without a .llseek pointer. The three cases that we can automatically detect are no_llseek, seq_lseek and default_llseek. For cases where we can we can automatically prove that the file offset is always ignored, we use noop_llseek, which maintains the current behavior of not returning an error from a seek. New drivers should normally not use noop_llseek but instead use no_llseek and call nonseekable_open at open time. Existing drivers can be converted to do the same when the maintainer knows for certain that no user code relies on calling seek on the device file. The generated code is often incorrectly indented and right now contains comments that clarify for each added line why a specific variant was chosen. In the version that gets submitted upstream, the comments will be gone and I will manually fix the indentation, because there does not seem to be a way to do that using coccinelle. Some amount of new code is currently sitting in linux-next that should get the same modifications, which I will do at the end of the merge window. Many thanks to Julia Lawall for helping me learn to write a semantic patch that does all this. ===== begin semantic patch ===== // This adds an llseek= method to all file operations, // as a preparation for making no_llseek the default. // // The rules are // - use no_llseek explicitly if we do nonseekable_open // - use seq_lseek for sequential files // - use default_llseek if we know we access f_pos // - use noop_llseek if we know we don't access f_pos, // but we still want to allow users to call lseek // @ open1 exists @ identifier nested_open; @@ nested_open(...) { <+... nonseekable_open(...) ...+> } @ open exists@ identifier open_f; identifier i, f; identifier open1.nested_open; @@ int open_f(struct inode *i, struct file *f) { <+... ( nonseekable_open(...) | nested_open(...) ) ...+> } @ read disable optional_qualifier exists @ identifier read_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; expression E; identifier func; @@ ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off) { <+... ( *off = E | *off += E | func(..., off, ...) | E = *off ) ...+> } @ read_no_fpos disable optional_qualifier exists @ identifier read_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; @@ ssize_t read_f(struct file *f, char *p, size_t s, loff_t *off) { ... when != off } @ write @ identifier write_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; expression E; identifier func; @@ ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off) { <+... ( *off = E | *off += E | func(..., off, ...) | E = *off ) ...+> } @ write_no_fpos @ identifier write_f; identifier f, p, s, off; type ssize_t, size_t, loff_t; @@ ssize_t write_f(struct file *f, const char *p, size_t s, loff_t *off) { ... when != off } @ fops0 @ identifier fops; @@ struct file_operations fops = { ... }; @ has_llseek depends on fops0 @ identifier fops0.fops; identifier llseek_f; @@ struct file_operations fops = { ... .llseek = llseek_f, ... }; @ has_read depends on fops0 @ identifier fops0.fops; identifier read_f; @@ struct file_operations fops = { ... .read = read_f, ... }; @ has_write depends on fops0 @ identifier fops0.fops; identifier write_f; @@ struct file_operations fops = { ... .write = write_f, ... }; @ has_open depends on fops0 @ identifier fops0.fops; identifier open_f; @@ struct file_operations fops = { ... .open = open_f, ... }; // use no_llseek if we call nonseekable_open //////////////////////////////////////////// @ nonseekable1 depends on !has_llseek && has_open @ identifier fops0.fops; identifier nso ~= "nonseekable_open"; @@ struct file_operations fops = { ... .open = nso, ... +.llseek = no_llseek, /* nonseekable */ }; @ nonseekable2 depends on !has_llseek @ identifier fops0.fops; identifier open.open_f; @@ struct file_operations fops = { ... .open = open_f, ... +.llseek = no_llseek, /* open uses nonseekable */ }; // use seq_lseek for sequential files ///////////////////////////////////// @ seq depends on !has_llseek @ identifier fops0.fops; identifier sr ~= "seq_read"; @@ struct file_operations fops = { ... .read = sr, ... +.llseek = seq_lseek, /* we have seq_read */ }; // use default_llseek if there is a readdir /////////////////////////////////////////// @ fops1 depends on !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier readdir_e; @@ // any other fop is used that changes pos struct file_operations fops = { ... .readdir = readdir_e, ... +.llseek = default_llseek, /* readdir is present */ }; // use default_llseek if at least one of read/write touches f_pos ///////////////////////////////////////////////////////////////// @ fops2 depends on !fops1 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier read.read_f; @@ // read fops use offset struct file_operations fops = { ... .read = read_f, ... +.llseek = default_llseek, /* read accesses f_pos */ }; @ fops3 depends on !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier write.write_f; @@ // write fops use offset struct file_operations fops = { ... .write = write_f, ... + .llseek = default_llseek, /* write accesses f_pos */ }; // Use noop_llseek if neither read nor write accesses f_pos /////////////////////////////////////////////////////////// @ fops4 depends on !fops1 && !fops2 && !fops3 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier read_no_fpos.read_f; identifier write_no_fpos.write_f; @@ // write fops use offset struct file_operations fops = { ... .write = write_f, .read = read_f, ... +.llseek = noop_llseek, /* read and write both use no f_pos */ }; @ depends on has_write && !has_read && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier write_no_fpos.write_f; @@ struct file_operations fops = { ... .write = write_f, ... +.llseek = noop_llseek, /* write uses no f_pos */ }; @ depends on has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; identifier read_no_fpos.read_f; @@ struct file_operations fops = { ... .read = read_f, ... +.llseek = noop_llseek, /* read uses no f_pos */ }; @ depends on !has_read && !has_write && !fops1 && !fops2 && !has_llseek && !nonseekable1 && !nonseekable2 && !seq @ identifier fops0.fops; @@ struct file_operations fops = { ... +.llseek = noop_llseek, /* no read or write fn */ }; ===== End semantic patch ===== Signed-off-by: Arnd Bergmann <arnd@arndb.de> Cc: Julia Lawall <julia@diku.dk> Cc: Christoph Hellwig <hch@infradead.org>
551 lines
12 KiB
C
551 lines
12 KiB
C
/*
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* IBM/3270 Driver - fullscreen driver.
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*
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* Author(s):
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* Original 3270 Code for 2.4 written by Richard Hitt (UTS Global)
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* Rewritten for 2.5/2.6 by Martin Schwidefsky <schwidefsky@de.ibm.com>
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* Copyright IBM Corp. 2003, 2009
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*/
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#include <linux/bootmem.h>
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#include <linux/console.h>
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#include <linux/init.h>
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#include <linux/interrupt.h>
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#include <linux/list.h>
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#include <linux/slab.h>
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#include <linux/types.h>
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#include <linux/smp_lock.h>
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#include <asm/compat.h>
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#include <asm/ccwdev.h>
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#include <asm/cio.h>
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#include <asm/ebcdic.h>
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#include <asm/idals.h>
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#include "raw3270.h"
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#include "ctrlchar.h"
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static struct raw3270_fn fs3270_fn;
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struct fs3270 {
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struct raw3270_view view;
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struct pid *fs_pid; /* Pid of controlling program. */
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int read_command; /* ccw command to use for reads. */
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int write_command; /* ccw command to use for writes. */
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int attention; /* Got attention. */
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int active; /* Fullscreen view is active. */
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struct raw3270_request *init; /* single init request. */
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wait_queue_head_t wait; /* Init & attention wait queue. */
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struct idal_buffer *rdbuf; /* full-screen-deactivate buffer */
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size_t rdbuf_size; /* size of data returned by RDBUF */
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};
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static DEFINE_MUTEX(fs3270_mutex);
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static void
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fs3270_wake_up(struct raw3270_request *rq, void *data)
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{
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wake_up((wait_queue_head_t *) data);
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}
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static inline int
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fs3270_working(struct fs3270 *fp)
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{
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/*
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* The fullscreen view is in working order if the view
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* has been activated AND the initial request is finished.
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*/
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return fp->active && raw3270_request_final(fp->init);
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}
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static int
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fs3270_do_io(struct raw3270_view *view, struct raw3270_request *rq)
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{
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struct fs3270 *fp;
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int rc;
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fp = (struct fs3270 *) view;
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rq->callback = fs3270_wake_up;
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rq->callback_data = &fp->wait;
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do {
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if (!fs3270_working(fp)) {
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/* Fullscreen view isn't ready yet. */
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rc = wait_event_interruptible(fp->wait,
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fs3270_working(fp));
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if (rc != 0)
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break;
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}
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rc = raw3270_start(view, rq);
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if (rc == 0) {
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/* Started successfully. Now wait for completion. */
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wait_event(fp->wait, raw3270_request_final(rq));
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}
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} while (rc == -EACCES);
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return rc;
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}
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/*
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* Switch to the fullscreen view.
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*/
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static void
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fs3270_reset_callback(struct raw3270_request *rq, void *data)
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{
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struct fs3270 *fp;
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fp = (struct fs3270 *) rq->view;
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raw3270_request_reset(rq);
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wake_up(&fp->wait);
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}
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static void
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fs3270_restore_callback(struct raw3270_request *rq, void *data)
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{
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struct fs3270 *fp;
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fp = (struct fs3270 *) rq->view;
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if (rq->rc != 0 || rq->rescnt != 0) {
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if (fp->fs_pid)
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kill_pid(fp->fs_pid, SIGHUP, 1);
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}
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fp->rdbuf_size = 0;
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raw3270_request_reset(rq);
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wake_up(&fp->wait);
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}
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static int
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fs3270_activate(struct raw3270_view *view)
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{
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struct fs3270 *fp;
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char *cp;
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int rc;
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fp = (struct fs3270 *) view;
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/* If an old init command is still running just return. */
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if (!raw3270_request_final(fp->init))
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return 0;
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if (fp->rdbuf_size == 0) {
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/* No saved buffer. Just clear the screen. */
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raw3270_request_set_cmd(fp->init, TC_EWRITEA);
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fp->init->callback = fs3270_reset_callback;
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} else {
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/* Restore fullscreen buffer saved by fs3270_deactivate. */
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raw3270_request_set_cmd(fp->init, TC_EWRITEA);
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raw3270_request_set_idal(fp->init, fp->rdbuf);
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fp->init->ccw.count = fp->rdbuf_size;
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cp = fp->rdbuf->data[0];
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cp[0] = TW_KR;
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cp[1] = TO_SBA;
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cp[2] = cp[6];
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cp[3] = cp[7];
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cp[4] = TO_IC;
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cp[5] = TO_SBA;
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cp[6] = 0x40;
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cp[7] = 0x40;
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fp->init->rescnt = 0;
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fp->init->callback = fs3270_restore_callback;
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}
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rc = fp->init->rc = raw3270_start_locked(view, fp->init);
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if (rc)
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fp->init->callback(fp->init, NULL);
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else
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fp->active = 1;
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return rc;
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}
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/*
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* Shutdown fullscreen view.
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*/
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static void
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fs3270_save_callback(struct raw3270_request *rq, void *data)
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{
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struct fs3270 *fp;
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fp = (struct fs3270 *) rq->view;
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/* Correct idal buffer element 0 address. */
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fp->rdbuf->data[0] -= 5;
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fp->rdbuf->size += 5;
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/*
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* If the rdbuf command failed or the idal buffer is
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* to small for the amount of data returned by the
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* rdbuf command, then we have no choice but to send
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* a SIGHUP to the application.
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*/
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if (rq->rc != 0 || rq->rescnt == 0) {
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if (fp->fs_pid)
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kill_pid(fp->fs_pid, SIGHUP, 1);
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fp->rdbuf_size = 0;
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} else
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fp->rdbuf_size = fp->rdbuf->size - rq->rescnt;
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raw3270_request_reset(rq);
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wake_up(&fp->wait);
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}
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static void
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fs3270_deactivate(struct raw3270_view *view)
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{
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struct fs3270 *fp;
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fp = (struct fs3270 *) view;
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fp->active = 0;
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/* If an old init command is still running just return. */
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if (!raw3270_request_final(fp->init))
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return;
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/* Prepare read-buffer request. */
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raw3270_request_set_cmd(fp->init, TC_RDBUF);
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/*
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* Hackish: skip first 5 bytes of the idal buffer to make
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* room for the TW_KR/TO_SBA/<address>/<address>/TO_IC sequence
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* in the activation command.
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*/
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fp->rdbuf->data[0] += 5;
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fp->rdbuf->size -= 5;
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raw3270_request_set_idal(fp->init, fp->rdbuf);
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fp->init->rescnt = 0;
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fp->init->callback = fs3270_save_callback;
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/* Start I/O to read in the 3270 buffer. */
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fp->init->rc = raw3270_start_locked(view, fp->init);
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if (fp->init->rc)
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fp->init->callback(fp->init, NULL);
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}
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static int
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fs3270_irq(struct fs3270 *fp, struct raw3270_request *rq, struct irb *irb)
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{
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/* Handle ATTN. Set indication and wake waiters for attention. */
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if (irb->scsw.cmd.dstat & DEV_STAT_ATTENTION) {
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fp->attention = 1;
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wake_up(&fp->wait);
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}
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if (rq) {
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if (irb->scsw.cmd.dstat & DEV_STAT_UNIT_CHECK)
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rq->rc = -EIO;
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else
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/* Normal end. Copy residual count. */
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rq->rescnt = irb->scsw.cmd.count;
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}
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return RAW3270_IO_DONE;
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}
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/*
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* Process reads from fullscreen 3270.
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*/
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static ssize_t
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fs3270_read(struct file *filp, char __user *data, size_t count, loff_t *off)
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{
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struct fs3270 *fp;
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struct raw3270_request *rq;
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struct idal_buffer *ib;
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ssize_t rc;
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if (count == 0 || count > 65535)
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return -EINVAL;
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fp = filp->private_data;
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if (!fp)
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return -ENODEV;
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ib = idal_buffer_alloc(count, 0);
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if (IS_ERR(ib))
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return -ENOMEM;
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rq = raw3270_request_alloc(0);
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if (!IS_ERR(rq)) {
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if (fp->read_command == 0 && fp->write_command != 0)
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fp->read_command = 6;
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raw3270_request_set_cmd(rq, fp->read_command ? : 2);
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raw3270_request_set_idal(rq, ib);
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rc = wait_event_interruptible(fp->wait, fp->attention);
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fp->attention = 0;
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if (rc == 0) {
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rc = fs3270_do_io(&fp->view, rq);
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if (rc == 0) {
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count -= rq->rescnt;
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if (idal_buffer_to_user(ib, data, count) != 0)
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rc = -EFAULT;
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else
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rc = count;
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}
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}
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raw3270_request_free(rq);
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} else
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rc = PTR_ERR(rq);
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idal_buffer_free(ib);
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return rc;
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}
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/*
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* Process writes to fullscreen 3270.
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*/
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static ssize_t
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fs3270_write(struct file *filp, const char __user *data, size_t count, loff_t *off)
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{
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struct fs3270 *fp;
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struct raw3270_request *rq;
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struct idal_buffer *ib;
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int write_command;
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ssize_t rc;
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fp = filp->private_data;
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if (!fp)
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return -ENODEV;
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ib = idal_buffer_alloc(count, 0);
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if (IS_ERR(ib))
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return -ENOMEM;
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rq = raw3270_request_alloc(0);
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if (!IS_ERR(rq)) {
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if (idal_buffer_from_user(ib, data, count) == 0) {
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write_command = fp->write_command ? : 1;
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if (write_command == 5)
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write_command = 13;
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raw3270_request_set_cmd(rq, write_command);
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raw3270_request_set_idal(rq, ib);
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rc = fs3270_do_io(&fp->view, rq);
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if (rc == 0)
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rc = count - rq->rescnt;
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} else
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rc = -EFAULT;
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raw3270_request_free(rq);
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} else
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rc = PTR_ERR(rq);
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idal_buffer_free(ib);
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return rc;
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}
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/*
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* process ioctl commands for the tube driver
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*/
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static long
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fs3270_ioctl(struct file *filp, unsigned int cmd, unsigned long arg)
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{
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char __user *argp;
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struct fs3270 *fp;
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struct raw3270_iocb iocb;
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int rc;
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fp = filp->private_data;
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if (!fp)
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return -ENODEV;
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if (is_compat_task())
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argp = compat_ptr(arg);
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else
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argp = (char __user *)arg;
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rc = 0;
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mutex_lock(&fs3270_mutex);
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switch (cmd) {
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case TUBICMD:
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fp->read_command = arg;
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break;
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case TUBOCMD:
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fp->write_command = arg;
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break;
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case TUBGETI:
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rc = put_user(fp->read_command, argp);
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break;
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case TUBGETO:
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rc = put_user(fp->write_command, argp);
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break;
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case TUBGETMOD:
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iocb.model = fp->view.model;
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iocb.line_cnt = fp->view.rows;
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iocb.col_cnt = fp->view.cols;
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iocb.pf_cnt = 24;
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iocb.re_cnt = 20;
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iocb.map = 0;
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if (copy_to_user(argp, &iocb, sizeof(struct raw3270_iocb)))
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rc = -EFAULT;
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break;
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}
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mutex_unlock(&fs3270_mutex);
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return rc;
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}
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/*
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* Allocate fs3270 structure.
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*/
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static struct fs3270 *
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fs3270_alloc_view(void)
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{
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struct fs3270 *fp;
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fp = kzalloc(sizeof(struct fs3270),GFP_KERNEL);
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if (!fp)
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return ERR_PTR(-ENOMEM);
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fp->init = raw3270_request_alloc(0);
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if (IS_ERR(fp->init)) {
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kfree(fp);
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return ERR_PTR(-ENOMEM);
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}
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return fp;
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}
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/*
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* Free fs3270 structure.
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*/
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static void
|
|
fs3270_free_view(struct raw3270_view *view)
|
|
{
|
|
struct fs3270 *fp;
|
|
|
|
fp = (struct fs3270 *) view;
|
|
if (fp->rdbuf)
|
|
idal_buffer_free(fp->rdbuf);
|
|
raw3270_request_free(((struct fs3270 *) view)->init);
|
|
kfree(view);
|
|
}
|
|
|
|
/*
|
|
* Unlink fs3270 data structure from filp.
|
|
*/
|
|
static void
|
|
fs3270_release(struct raw3270_view *view)
|
|
{
|
|
struct fs3270 *fp;
|
|
|
|
fp = (struct fs3270 *) view;
|
|
if (fp->fs_pid)
|
|
kill_pid(fp->fs_pid, SIGHUP, 1);
|
|
}
|
|
|
|
/* View to a 3270 device. Can be console, tty or fullscreen. */
|
|
static struct raw3270_fn fs3270_fn = {
|
|
.activate = fs3270_activate,
|
|
.deactivate = fs3270_deactivate,
|
|
.intv = (void *) fs3270_irq,
|
|
.release = fs3270_release,
|
|
.free = fs3270_free_view
|
|
};
|
|
|
|
/*
|
|
* This routine is called whenever a 3270 fullscreen device is opened.
|
|
*/
|
|
static int
|
|
fs3270_open(struct inode *inode, struct file *filp)
|
|
{
|
|
struct fs3270 *fp;
|
|
struct idal_buffer *ib;
|
|
int minor, rc = 0;
|
|
|
|
if (imajor(filp->f_path.dentry->d_inode) != IBM_FS3270_MAJOR)
|
|
return -ENODEV;
|
|
minor = iminor(filp->f_path.dentry->d_inode);
|
|
/* Check for minor 0 multiplexer. */
|
|
if (minor == 0) {
|
|
struct tty_struct *tty = get_current_tty();
|
|
if (!tty || tty->driver->major != IBM_TTY3270_MAJOR) {
|
|
tty_kref_put(tty);
|
|
return -ENODEV;
|
|
}
|
|
minor = tty->index + RAW3270_FIRSTMINOR;
|
|
tty_kref_put(tty);
|
|
}
|
|
mutex_lock(&fs3270_mutex);
|
|
/* Check if some other program is already using fullscreen mode. */
|
|
fp = (struct fs3270 *) raw3270_find_view(&fs3270_fn, minor);
|
|
if (!IS_ERR(fp)) {
|
|
raw3270_put_view(&fp->view);
|
|
rc = -EBUSY;
|
|
goto out;
|
|
}
|
|
/* Allocate fullscreen view structure. */
|
|
fp = fs3270_alloc_view();
|
|
if (IS_ERR(fp)) {
|
|
rc = PTR_ERR(fp);
|
|
goto out;
|
|
}
|
|
|
|
init_waitqueue_head(&fp->wait);
|
|
fp->fs_pid = get_pid(task_pid(current));
|
|
rc = raw3270_add_view(&fp->view, &fs3270_fn, minor);
|
|
if (rc) {
|
|
fs3270_free_view(&fp->view);
|
|
goto out;
|
|
}
|
|
|
|
/* Allocate idal-buffer. */
|
|
ib = idal_buffer_alloc(2*fp->view.rows*fp->view.cols + 5, 0);
|
|
if (IS_ERR(ib)) {
|
|
raw3270_put_view(&fp->view);
|
|
raw3270_del_view(&fp->view);
|
|
rc = PTR_ERR(ib);
|
|
goto out;
|
|
}
|
|
fp->rdbuf = ib;
|
|
|
|
rc = raw3270_activate_view(&fp->view);
|
|
if (rc) {
|
|
raw3270_put_view(&fp->view);
|
|
raw3270_del_view(&fp->view);
|
|
goto out;
|
|
}
|
|
nonseekable_open(inode, filp);
|
|
filp->private_data = fp;
|
|
out:
|
|
mutex_unlock(&fs3270_mutex);
|
|
return rc;
|
|
}
|
|
|
|
/*
|
|
* This routine is called when the 3270 tty is closed. We wait
|
|
* for the remaining request to be completed. Then we clean up.
|
|
*/
|
|
static int
|
|
fs3270_close(struct inode *inode, struct file *filp)
|
|
{
|
|
struct fs3270 *fp;
|
|
|
|
fp = filp->private_data;
|
|
filp->private_data = NULL;
|
|
if (fp) {
|
|
put_pid(fp->fs_pid);
|
|
fp->fs_pid = NULL;
|
|
raw3270_reset(&fp->view);
|
|
raw3270_put_view(&fp->view);
|
|
raw3270_del_view(&fp->view);
|
|
}
|
|
return 0;
|
|
}
|
|
|
|
static const struct file_operations fs3270_fops = {
|
|
.owner = THIS_MODULE, /* owner */
|
|
.read = fs3270_read, /* read */
|
|
.write = fs3270_write, /* write */
|
|
.unlocked_ioctl = fs3270_ioctl, /* ioctl */
|
|
.compat_ioctl = fs3270_ioctl, /* ioctl */
|
|
.open = fs3270_open, /* open */
|
|
.release = fs3270_close, /* release */
|
|
.llseek = no_llseek,
|
|
};
|
|
|
|
/*
|
|
* 3270 fullscreen driver initialization.
|
|
*/
|
|
static int __init
|
|
fs3270_init(void)
|
|
{
|
|
int rc;
|
|
|
|
rc = register_chrdev(IBM_FS3270_MAJOR, "fs3270", &fs3270_fops);
|
|
if (rc)
|
|
return rc;
|
|
return 0;
|
|
}
|
|
|
|
static void __exit
|
|
fs3270_exit(void)
|
|
{
|
|
unregister_chrdev(IBM_FS3270_MAJOR, "fs3270");
|
|
}
|
|
|
|
MODULE_LICENSE("GPL");
|
|
MODULE_ALIAS_CHARDEV_MAJOR(IBM_FS3270_MAJOR);
|
|
|
|
module_init(fs3270_init);
|
|
module_exit(fs3270_exit);
|