dm-ioctl.c (86a3238c7b9b759cb864f4f768ab2e24687dc0e6) dm-ioctl.c (a4a82ce3d24d4409143a7b7b980072ada6e20b2a)
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2001, 2002 Sistina Software (UK) Limited.
4 * Copyright (C) 2004 - 2006 Red Hat, Inc. All rights reserved.
5 *
6 * This file is released under the GPL.
7 */
8

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30struct dm_file {
31 /*
32 * poll will wait until the global event number is greater than
33 * this value.
34 */
35 volatile unsigned int global_event_nr;
36};
37
1// SPDX-License-Identifier: GPL-2.0-only
2/*
3 * Copyright (C) 2001, 2002 Sistina Software (UK) Limited.
4 * Copyright (C) 2004 - 2006 Red Hat, Inc. All rights reserved.
5 *
6 * This file is released under the GPL.
7 */
8

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30struct dm_file {
31 /*
32 * poll will wait until the global event number is greater than
33 * this value.
34 */
35 volatile unsigned int global_event_nr;
36};
37
38/*-----------------------------------------------------------------
38/*
39 *---------------------------------------------------------------
39 * The ioctl interface needs to be able to look up devices by
40 * name or uuid.
40 * The ioctl interface needs to be able to look up devices by
41 * name or uuid.
41 *---------------------------------------------------------------*/
42 *---------------------------------------------------------------
43 */
42struct hash_cell {
43 struct rb_node name_node;
44 struct rb_node uuid_node;
45 bool name_set;
46 bool uuid_set;
47
48 char *name;
49 char *uuid;

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74 */
75static DEFINE_MUTEX(dm_hash_cells_mutex);
76
77static void dm_hash_exit(void)
78{
79 dm_hash_remove_all(false, false, false);
80}
81
44struct hash_cell {
45 struct rb_node name_node;
46 struct rb_node uuid_node;
47 bool name_set;
48 bool uuid_set;
49
50 char *name;
51 char *uuid;

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76 */
77static DEFINE_MUTEX(dm_hash_cells_mutex);
78
79static void dm_hash_exit(void)
80{
81 dm_hash_remove_all(false, false, false);
82}
83
82/*-----------------------------------------------------------------
84/*
85 *---------------------------------------------------------------
83 * Code for looking up a device by name
86 * Code for looking up a device by name
84 *---------------------------------------------------------------*/
87 *---------------------------------------------------------------
88 */
85static struct hash_cell *__get_name_cell(const char *str)
86{
87 struct rb_node *n = name_rb_tree.rb_node;
88
89 while (n) {
90 struct hash_cell *hc = container_of(n, struct hash_cell, name_node);
91 int c = strcmp(hc->name, str);
92 if (!c) {

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191 if (!hc) {
192 dm_put(md);
193 return NULL;
194 }
195
196 return hc;
197}
198
89static struct hash_cell *__get_name_cell(const char *str)
90{
91 struct rb_node *n = name_rb_tree.rb_node;
92
93 while (n) {
94 struct hash_cell *hc = container_of(n, struct hash_cell, name_node);
95 int c = strcmp(hc->name, str);
96 if (!c) {

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195 if (!hc) {
196 dm_put(md);
197 return NULL;
198 }
199
200 return hc;
201}
202
199/*-----------------------------------------------------------------
203/*
204 *---------------------------------------------------------------
200 * Inserting, removing and renaming a device.
205 * Inserting, removing and renaming a device.
201 *---------------------------------------------------------------*/
206 *---------------------------------------------------------------
207 */
202static struct hash_cell *alloc_cell(const char *name, const char *uuid,
203 struct mapped_device *md)
204{
205 struct hash_cell *hc;
206
207 hc = kmalloc(sizeof(*hc), GFP_KERNEL);
208 if (!hc)
209 return NULL;

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496 return md;
497}
498
499void dm_deferred_remove(void)
500{
501 dm_hash_remove_all(true, false, true);
502}
503
208static struct hash_cell *alloc_cell(const char *name, const char *uuid,
209 struct mapped_device *md)
210{
211 struct hash_cell *hc;
212
213 hc = kmalloc(sizeof(*hc), GFP_KERNEL);
214 if (!hc)
215 return NULL;

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502 return md;
503}
504
505void dm_deferred_remove(void)
506{
507 dm_hash_remove_all(true, false, true);
508}
509
504/*-----------------------------------------------------------------
510/*
511 *---------------------------------------------------------------
505 * Implementation of the ioctl commands
512 * Implementation of the ioctl commands
506 *---------------------------------------------------------------*/
513 *---------------------------------------------------------------
514 */
507/*
508 * All the ioctl commands get dispatched to functions with this
509 * prototype.
510 */
511typedef int (*ioctl_fn)(struct file *filp, struct dm_ioctl *param, size_t param_size);
512
513static int remove_all(struct file *filp, struct dm_ioctl *param, size_t param_size)
514{

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1759 * The ioctl parameter block consists of two parts, a dm_ioctl struct
1760 * followed by a data buffer. This flag is set if the second part,
1761 * which has a variable size, is not used by the function processing
1762 * the ioctl.
1763 */
1764#define IOCTL_FLAGS_NO_PARAMS 1
1765#define IOCTL_FLAGS_ISSUE_GLOBAL_EVENT 2
1766
515/*
516 * All the ioctl commands get dispatched to functions with this
517 * prototype.
518 */
519typedef int (*ioctl_fn)(struct file *filp, struct dm_ioctl *param, size_t param_size);
520
521static int remove_all(struct file *filp, struct dm_ioctl *param, size_t param_size)
522{

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1767 * The ioctl parameter block consists of two parts, a dm_ioctl struct
1768 * followed by a data buffer. This flag is set if the second part,
1769 * which has a variable size, is not used by the function processing
1770 * the ioctl.
1771 */
1772#define IOCTL_FLAGS_NO_PARAMS 1
1773#define IOCTL_FLAGS_ISSUE_GLOBAL_EVENT 2
1774
1767/*-----------------------------------------------------------------
1768 * Implementation of open/close/ioctl on the special char
1769 * device.
1770 *---------------------------------------------------------------*/
1775/*
1776 *---------------------------------------------------------------
1777 * Implementation of open/close/ioctl on the special char device.
1778 *---------------------------------------------------------------
1779 */
1771static ioctl_fn lookup_ioctl(unsigned int cmd, int *ioctl_flags)
1772{
1773 static const struct {
1774 int cmd;
1775 int flags;
1776 ioctl_fn fn;
1777 } _ioctls[] = {
1778 {DM_VERSION_CMD, 0, NULL}, /* version is dealt with elsewhere */

--- 480 unchanged lines hidden --- 		1780static ioctl_fn lookup_ioctl(unsigned int cmd, int *ioctl_flags)
1781{
1782 static const struct {
1783 int cmd;
1784 int flags;
1785 ioctl_fn fn;
1786 } _ioctls[] = {
1787 {DM_VERSION_CMD, 0, NULL}, /* version is dealt with elsewhere */

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